CN103161719A

CN103161719A - Control of a pump device

Info

Publication number: CN103161719A
Application number: CN201210540847XA
Authority: CN
Inventors: N.马格努森
Original assignee: Sulzer Pump Solutions AB
Current assignee: Sulzer Pump Solutions AB
Priority date: 2011-12-15
Filing date: 2012-12-14
Publication date: 2013-06-19
Also published as: EP2604861A2; AU2012247078A1; BR102012031813A2; US20130177450A1; ZA201209075B

Abstract

A method of controlling a pump device for discharging fluid, wherein the method comprises the steps of providing a heat portion adapted to be thermally coupled to the fluid to allow heat transfer there between when the fluid is at or above a certain level; monitoring a temperature parameter reflecting a temperature of the heat portion, the temperature parameter including a temperature value of the temperature of the heat portion; calculating a cooling rate value (CRV), the calculation including a comparison between at least two temperature values measured at different times; performing a pumping operation analysis including a comparison between a present cooling rate value (CRV) and a reference cooling rate value (ref), the reference cooling rate value representing a specific cooling rate of the heat portion; and initiating pumping operation to discharge the fluid if the cooling rate value is equal to or exceeds the reference cooling rate value.

Description

The control of pumping unit

Technical field

The present invention relates to the field for the method for control pump equipment, described pumping unit is used for discharging fluid.The invention still further relates to the field for the equipment of control pump equipment, described pumping unit is used for discharging fluid.

Background technique

Use to be used for discharge the pumping unit of fluid in many application, for example from fluid reservoir get rid of fluid from the building site or sewage pipe discharge excess fluid.This type of pumping unit can be submersible type, and namely pumping unit can be immersed in the fluid that pumping unit is suitable for discharging at least in part.In some applications, for example in the situation that fluid levels (fluid level, fluid level) changes, automatically the pumping operation of control pump equipment may be expected.For example, may expect to change according to fluid levels or its and come control pump equipment be unlocked or turn off.In addition, also may expect to control according to the variation of fluid levels speed or the pump rate of motor.Therefore, be in or during lower than predetermined reduced levels, pumping unit is switched off when fluid levels.Then pumping unit can be arranged to starting after predetermined amount of time.This type of automatic control pump equipment is favourable, to avoid the damage to pumping unit of expection when pumping unit is done running.

At US 6,203, proposed to realize this type of method of control automatically in 282, wherein, the reference value of the electric current of driven pump equipment motor is stored in storage and compares with current electric current and done the time of running by the pump of the electric current indication that reduces in order to determine.

At US 6,481, the other method of the automatic control of pump has been proposed in 973.Excess Temperature can monitor the temperature of the motor of driven pump, and if can make pump stop in order to avoiding the overheated of pump.By the usage level sensor or by detecting reducing suddenly or by detecting the unexpected increase of motor speed, can realizing that pump begins pumped air rather than fluid, namely does the detection of running of motor torque.After pump stops, can resetting pump after the scheduled time or when motor temperature is reduced to predetermined value.If fluid levels will increase rapidly at predetermined time period when pump stops, waiting for before resetting pump that the scheduled time may be due to the risk of overflow but individual problem.This problem can partly be alleviated by selecting the very short scheduled time, but on the other hand, this will cause excessive unnecessary starting and operation, cause the wearing and tearing of pump.By the time temperature is reduced to predeterminated level and may causes Similar Problems before resetting pump, and namely temperature extremes is configured to the unnecessary starting in situation that overflow risk in the situation of too low value or temperature extremes be configured to too high value and does running.

Therefore, need a kind of control to be used for discharging the improving one's methods of pumping unit of fluid, and the improving one's methods of starting of control pump equipment particularly, it has overcome the above-mentioned shortcoming of prior art.

Summary of the invention

The purpose of this invention is to provide a kind of control improving one's methods for the pumping unit of discharging fluid, it has realized repeating and detecting accurately of the fluid levels that increases, make and discharge fluid so that when avoiding overflow when needs, pumping unit is started reliably, the number of times that has limited simultaneously the unnecessary of pumping unit and do not expected to start.

By the method with the feature that limits is provided, this purpose and other purposes have been realized according to the present invention in independent claims.Define in the dependent claims preferred embodiment.

According to a first aspect of the invention, provide a kind of control to be used for the method for the pumping unit of discharge fluid.The method comprising the steps of: hot part is provided, and described heat part is suitable for being thermally coupled to described fluid to be at fluid or to allow heat transmission between it during higher than certain fluid levels; Monitor the temperature parameter of the temperature of the described heat part of reflection, described temperature parameter comprises the temperature value of the temperature of described heat part; Calculate the cooling rate value, described calculating is included in the comparison between at least two temperature values that different time measures; The execution pumping operation is analyzed, described pumping operation analysis comprise current cooling rate value with reference to the comparison between the cooling rate value, describedly represent described heat specific cooling rate partly with reference to the cooling rate value; And if described cooling rate value equals or exceeds describedly with reference to the cooling rate value, start pumping operation to discharge described fluid.

Described heat part can be the part of pumping unit, perhaps can be connected to pumping unit.And the cooling rate value makes the cooling rate value corresponding to the heat transmission from the heat part to its surrounding environment therefore based at least two temperature values measuring at different time, comprises its thermal coupling fluid, the cooling degree of instant heating part.The cooling rate value in addition can be based at least two accounting temperature values, based on the temperature value of measuring at different time.Especially, the cooling rate value can be based on two temperature values, and it is the average temperature value at a plurality of temperature values of different time measurement.In addition, with reference to the specific cooling rate of cooling rate value representative corresponding to the fluid levels rising of fluid.In other words, the rising of fluid levels increases hot partial circuit cooling effect, causes the increase of cooling rate.Therefore, select with reference to the cooling rate value to represent that described fluid levels increase namely is thermally coupled to the increase of the amount of heat fluid partly corresponding to the specific cooling rate of the heat transmission that comes the self-heating part of the increase of reflection fluid levels or rising.

According to a second aspect of the invention, provide the control apparatus that is used for controlling the pumping unit that is used for discharging fluid, described equipment comprises hot part, and described heat part is suitable for being in or being thermally coupled to described fluid during higher than certain fluid levels at fluid; The first temperature transducer, described the first temperature transducer are used for monitoring the temperature of described heat part, and described the first temperature transducer is suitable for providing the temperature sensor signal of the temperature that represents the heat part; And controller, described controller is suitable for applying control signal to connecting pumping unit, and described controller also is suitable for calculating cooling rate according to the first temperature sensor signal of different time based at least two temperature values in different time measurements; The execution pumping operation is analyzed, described pumping operation analysis comprise current cooling rate value with reference to the comparison between the cooling rate value, describedly represent described heat specific cooling rate partly with reference to the cooling rate value; And if described cooling rate value equals or exceeds describedly with reference to the cooling rate value, apply control signal to start pumping operation to discharge described fluid to connecting pumping unit.

According to a third aspect of the invention we, provide a kind of pumping system, it comprises pumping unit and according to the control apparatus of second aspect.

Therefore, realized controlling the method for the pumping unit that is used for the discharge fluid, described method comprises the starting of pumping operation, due to the service-strong thermometry rather than use mechanical pick-up device such as level sensor (it may be hindered by the object in fluid, for example when fluid is the fluid of waste water or other contain materials), compared with prior art, it can be more steadily and detects repeatedly the fluid levels that increases.In addition, due to change or the variation of starting conditions based on temperature, cooling rate more precisely, rather than may be easy to be subject to the static temperature value of the impact of many source of errors, the method also detects the fluid levels that increases rapidly and reliably.Therefore, cooling rate (calculating from measured hot portion temperature value) responds the fluid levels that increases rapidly.

In other words, the step of temperature parameter that monitors the temperature of reflect heat part is included in during at least a portion of time continuously or with regular interval or measure temperature parameter with irregular spacing.In the operation period of pumping unit, this interval can be that be scheduled to or adjustable and/or adaptable.In other words, the step of calculating the cooling rate value comprises based at least the first temperature value and the second temperature value calculates the cooling rate value, and wherein, the first and second temperature values are in time in turn or continuously, for example one after the other measure.The calculating of cooling rate comprises comparison and/or poor calculating of at least two temperature values.In other words, the step of execution pumping operation analysis can comprise institute's calculating cooling rate value and compare with reference to the cooling rate value.In other words, select with reference to the cooling rate value to represent the predetermined cool down rate of the heat part of advancing the speed corresponding to fluid levels.

Therefore, the present invention is based on such understanding, the ascending fluid level of the fluid that namely will discharge provides cooling effect, and to go speed and fluid levels to exist between rising relevant cold, and it can be used for monitoring fluid levels.And, also there is such understanding, namely this relevant can being used for is not detected the ascending fluid level at pump when operating.In other words, the present invention is based on such understanding, namely can select with reference to the cooling rate value detecting reliably and exactly the ascending fluid level, so as when fluid levels to rise priming pump equipment or start pumping operation to discharge fluid.Therefore, by calculate the cooling rate value and with its with compare with reference to the cooling rate value, the fluid levels rising can be detected.The cooling rate value is based on being arranged to be thermally coupled to the heat thermometry partly that fluid transmits with the heat that allows between it.As can be appreciated, heat part is furnished with at least temperature higher than fluid temperature (F.T.) to allow the cooling in order to the cooling rate value is provided of heat part.Preferably, the heat part is furnished with the temperature higher than described fluid temperature (F.T.), in order to provide or guarantee to be enough to calculate the temperature difference of the cooling rate value that represents that fluid levels rises.

For given fluid temperature (F.T.), the indication of the low reference fluid level in the time of can being chosen as pumping unit and being suitable for starting pumping operation with reference to the cooling rate value.In other words, because the cooling rate value can reflect heat transfer rate between fluid and heat part, the cooling rate value can be relevant to the speed that fluid levels is increasing.For example, the quick increase of fluid levels causes a large amount of fluids (having the temperature lower than the heat part) and heat part to carry out thermo-contact, causes the fast reducing of hot portion temperature, i.e. high cooling rate value.Therefore can make that to accuse cooling rate relevant to the quick increase of fluid levels, and can from but the indication of high fluid levels.Therefore, the indication of that limit or the predetermined fluid levels of the user in the time of can being chosen as pumping unit and will discharging fluid with reference to the cooling rate value, the fluid levels when being about to start the pumping operation of pumping unit.In other words, can realize reliably and the repeatably method for the pumping unit of control to be used for discharging fluid, it can control pump equipment, makes that the serviceability temperature sensor limits the user or predetermined fluid levels place start pumping operation.

Be understood that heat part is thermally coupled to fluid and can refers to the heat part and be arranged to carry out thermo-contact to allow hot transmission with fluid when fluid levels during higher than predetermined low level (this predetermined low level be above the ground level level, floor surface or have need the bottom surface in the space of the fluid of discharging), be that fluid levels need to higher than certain level, make the thermal coupling that can allow between heat part and fluid.Predetermined low level can also be corresponding to such fluid levels, and on this fluid levels, pumping unit is suitable for discharging fluid.

Be understood that cooling rate on the occasion of corresponding to the hot portion temperature that descends.Be understood that in addition mutually to be close in time comparison between at least two temperature values one after the other measuring or one after the other measure in time with the scheduled time at least in relatively can comprise between two temperature values that different time is measured to have the temperature value sample of the scheduled time or predetermined number in relatively at least between two temperature values of use at this.The difference that can be included in more in addition the heat part between at least two temperature values that different time is measured, the i.e. comparison of the temperature value of at least two position measurements.Can also measure temperature value at the diverse location place of heat part, thus the temperature of the different piece of this temperature value reflect heat part.In other words, the comparison between at least two temperature values that the step of calculating the cooling rate value can be included in that different time measures and at least two temperature values measuring at the diverse location place of heat part.This may be favourable in the embodiment that the heat part is being extended along the direction of fluid levels increase or decline.In this type of embodiment, can realize advantageous effects, because can calculate cooling rate by at least two temperature values that at least two temperature values relatively measuring at different time and/or comparison are measured at the diverse location place of heat part.Therefore, the cooling rate value changes on time and space.

Can be on one's own initiative or realize that passively it is temperature difference higher than fluid temperature (F.T.) at least that temperature difference between heat part and fluid, the temperature of instant heating part are arranged to.For example wherein the temperature of surrounding environment is fully in the environment higher than fluid temperature (F.T.), the heat part can have the temperature identical with ambient temperature.In this case, the heat part does not require initiatively heating, thereby guarantees passively abundant and suitable temperature difference.

In an embodiment of the present invention, the method also comprises step: described heat part is heated to certain temperature or higher than the temperature difference of fluid temperature (F.T.).For example wherein in the environment of the temperature of surrounding environment close to fluid temperature (F.T.), the heat part can require heating obtaining temperature difference, thereby guarantees to provide on one's own initiative abundant and suitable temperature difference passively.This is favourable, because realized the temperature difference between hot part and fluid, it is selected as making and can calculates accurately the cooling rate value in order to alleviate noise and the impact of numerical problem.It is advantageously, in addition because the large initial temperature poor (after heat is partly heated) between heat part and fluid can require not repeat so continually step that heat is partly heated.

In another embodiment of the present invention, the method also comprises step: if the difference between temperature value and reference temperature value is equal to or less than reference difference, heat is partly heated.If pumping equipment transfixion (being that pumping unit does not carry out pumping operation) reaches a period of time and makes the temperature of heat part be reduced to such degree, to such an extent as to the temperature difference between heat part and fluid is insufficient large, thereby can use for the sluggishness of measuring noise and numerical problem and calculate cooling rate, this is favourable.By current temperature value and the difference between reference temperature value of heat part are compared with reference difference, can avoid not calculate exactly or the situation when at all not calculating cooling rate or minimize it.

In another embodiment of the present invention, the method also comprises step: if pumping operation does not start after predetermined time interval, repeat the step that heat is partly heated.If pumping equipment transfixion (being that pumping unit does not carry out pumping operation) reaches a period of time and makes the temperature of heat part be reduced to such degree, to such an extent as to the temperature difference between heat part and fluid is insufficient large, thereby can use for the sluggishness of measuring noise and numerical problem and calculate cooling rate, this is favourable.Can described predetermined time interval be arranged to steady state value based on measurement result and/or field experiment, perhaps can revise in operation period of pumping equipment, make and to avoid not calculate exactly or the situation when at all not calculating cooling rate or minimize it.

In another embodiment of the present invention, the method also comprises step: heat is partly heated, comprise hot part electric heating.Can by means of be thermally coupled to heat part by electrically heated element with hot part electric heating.

In another embodiment of the present invention, the method also comprises step: with the heating of described heat part, comprise with the motor that is suitable for driven pump equipment heat is partly heated, this motor is thermally coupled to hot part.In other words, the step of heating comprises the motor heating that moves or will be coupled to the heat part with other means, makes heat be passed to hot part from motor, and wherein, motor is suitable for driven pump equipment.Therefore, can heat partly be heated by using from the heat loss of motor, otherwise this heat loss will be dissipated to fluid or surrounding atmosphere.The heat part can be the part of motor.This is favourable, because do not require the additional heat part.

In another embodiment of the present invention, the heat part is by electrically heated element.This can be by electrically heated temperature transducer by electrically heated element.In another embodiment of the present invention, the method also comprises step: monitor at least one motor load parameter of the load of reflection motor, this motor is arranged to for driven pump equipment, and this load parameter comprises the motor load value of the motor load of motor.The method can comprise step in addition: if the motor load value is equal to or less than with reference to the motor load value, interrupt pumping operation.Can represent the pumping unit any fluid of not pumping, motor load value when namely doing running in essence with reference to the motor load value.Therefore, when pump due to low overflow level or the running that hops to it the time motor is stopped, in order to avoid the damage to pumping unit and/or motor.

In another embodiment of the present invention, the method also comprises step: if the motor load value is equal to or higher than with reference to the motor load value, interrupts the step that heat is partly heated and start pumping operation.In other words, if be equal to or higher than indication with reference to the motor load value by the motor load value, fluid levels increases basically, can interrupt step that heat is partly heated, and can start pumping operation.For example wherein heat part in the situation that fluid levels when being heated when beginning to increase, can detect the fluid levels of this increase and interrupt heating steps and alternatively start pumping operation, make that to avoid overflow be favourable.

In another embodiment of the present invention, described motor is electric notor.

The motor load value can be the tolerance that is supplied to the power of motor.In the situation that electric notor, this motor load value can be for example based on the cosine of the phase difference between the voltage and current on the electric winding of electric notor.In other embodiments, the motor load value can be the electric current by the electric winding of electric notor.

The heat part can be the electric winding of electric notor.This is favourable, because when pumping unit operates, namely when presenting electric current by electric winding, electric winding is because side effect is heated.Thereby when presenting electric current by electric winding, the heat part can be taked the temperature higher than fluid, thereby can calculate the cooling rate of heat part after pumping unit stops or after current stops at least.In addition, can be with the normally standard assembling of electric winding in order to monitor that the overheated temperature transducer of winding is used for monitoring that on hot portion temperature meaning be favourable, does not therefore require the additional temp sensor.In another embodiment, can measure by the resistance of measuring electric winding the temperature of heat part.This is favourable, because can not require temperature transducer.

The described hot partly step of heating can be comprised by the electric winding of electric notor present electric current.In other words, the electric winding of the electric notor by having certain size is presented electric current, makes due to the resistance of winding and produce gradually heat in winding.Electric current can have enough little size, makes to be connected to electric notor and to be arranged to not rotate be used to the pump impeller of the pumping unit of discharging described fluid.In other words, electric current can have enough little size, makes electric winding only serve as heating element.This is favourable, because can not cause unnecessary wearing and tearing to pumping unit from the step that heat is partly heated, because pump impeller and motor do not rotate.In another embodiment, the size of electric current can be so that the pump impeller of pumping unit rotate, if namely make fluid levels be suitable for discharging the floor level of fluid higher than pumping unit pumping unit will be discharged fluid.This is favourable, because based on the electric current on the measurement electric current by electric winding or electric winding as discussed above and the phase difference between voltage, can detect the fluid levels of the increase during the step that heat is partly heated.

In another embodiment of the present invention, motor can be the motor of internal-combustion engine or any other type.Heat partly can be thermally coupled to the exhaust side of internal-combustion engine, make it possible to achieve the rapid heating of heat part.

In another embodiment of the present invention, the method also comprises step: monitor the fluid temperature (F.T.) parameter of reflection fluid temperature (F.T.), this fluid temperature (F.T.) parameter comprises the fluid temperature (F.T.) value of the temperature of fluid.In addition, the method can comprise with respect to the fluid temperature (F.T.) value and revises at least one step in following parameter: reference temperature value, reference difference, with reference to the cooling rate value.The step of revising can comprise the modification reference difference, makes it be in sufficiently high level on current fluid temperature (F.T.).This is favourable, because realized the sufficiently high temperature difference between hot part and fluid, it can allow to calculate the cooling rate value with the sluggishness for noise and numerical problem.It is favourable, in addition because the sufficiently high initial temperature poor (after heat is partly heated) between heat part and fluid can allow not repeat so continually step that heat is partly heated.The step of revising can comprise based on the modification value of reference temperature and/or reference difference and revise the cooling rate value based on the fluid temperature (F.T.) value.It is favourable revising reference temperature value and/or cooling rate value, even because fluid temperature (F.T.) becomes in time, also can with consistent fluid levels advance the speed or consistent fluid levels with the pumping operation initialization.

Can use hot portion temperature value and/or fluid temperature (F.T.) value to carry out normalization to reference cooling rate value.Thereby, the cooling rate value of calculating and with reference between the cooling rate value relatively can be more sane in environmential range widely, and less sensitive to the absolute value of Current Temperatures.

In another embodiment, be the function of hot portion temperature or the function of normalized hot portion temperature with reference to the cooling rate value.This function can be for example index function, linear function or multinomial.The step of revising can comprise the parameter of Modification growth function.Parameter that can Modification growth function, even make fluid temperature (F.T.) become in time, also can with consistent fluid levels advance the speed or consistent fluid levels with the pumping operation initialization.

In another embodiment of the present invention, pumping unit is submersible pump.Submersible pump can refer to the pumping unit that comprises pump case, at least one pump impeller and motor, and wherein, whole pumping unit can be immersed in fluid.The motor of submersible pump is can be during operation cooling by surrounding fluid institute.In another embodiment, pumping unit is vertical submersible pump, and wherein, the motor of driven pump impeller is disposed in pump impeller at a distance of vertical distance, and it can be basically higher than fluid levels.

In another embodiment of the present invention, pumping unit can be self-contained pump, and wherein, pumping unit is coupled to a position by fluid, from this position, will discharge fluid by means of for example flexible pipe or pipe.In the present embodiment, heat part can preferably be arranged to contact with fluid thermal by electrically heated temperature transducer.

In another embodiment of the present invention, pumping unit can be vertical pump, and wherein, pump case and pump impeller are disposed in motor and locate in a distance.Therefore pump case is immersed in fluid at least in part, and motor does not have.Can pump impeller be coupled to motor via for example wheel shaft.In the present embodiment, the heat part part of pump case preferably.

In another embodiment of the present invention, the cooling rate value is the time-derivative of the temperature of heat part.Can use with at least two temperature values measuring at different time and for example retreat the time-derivative that differential technique calculates the temperature of heat part.

In another embodiment of the present invention, the cooling rate value is the thermal transmission coefficient of described heat part.In other words, the cooling rate value is the thermal transmission coefficient of the heat transfer rate between indication heat part and fluid and/or air.Can calculate this thermal transmission coefficient according to following formula:

T(τ)=T _fluid-(T(0)-T _fluid)*exp(-A*h/(m*Cp)*τ)

Wherein, T is hot portion temperature, and τ is cool time, T _FluidBe fluid temperature (F.T.), A, m*Cp are the thermal masses (constant) of heat part, and h is thermal transmission coefficient.The thermal mass m*Cp of heat part can be expressed as:

m*Cp=Σ(m _i*Cp _i)

Wherein, m _iQuality and the Cp of the subdivision i of heat part _iIt is the specific heat capacity of the subdivision i of heat part.

In another embodiment of the present invention, the step that monitors at least one temperature parameter can comprise at least one temperature value is stored in memory device.

In an embodiment of the present invention, control apparatus comprises a plurality of temperature transducers be used to the temperature that monitors described heat part.This temperature transducer is suitable for providing the temperature transducer of the temperature that represents the heat part.Calculate cooling rate value (CRV) from the temperature sensor signal of different time based at least two temperature values measuring at different time.Described a plurality of temperature transducers can be arranged to measure the temperature of the various positions around the pump case circumference.

Description of drawings

Referring now to the current accompanying drawing that the preferred embodiments of the present invention are shown, these and other aspect of the present invention is described in more detail, in described accompanying drawing:

Fig. 1 is embodiment's the flow chart of the method for description control pumping unit,

Fig. 2 is another embodiment's the flow chart of the method for description control pumping unit,

Fig. 3 is another embodiment's the flow chart of the method for description control pumping unit,

Fig. 4 is another embodiment's the flow chart of the method for description control pumping unit,

Fig. 5 is another embodiment's the flow chart of the method for description control pumping unit,

Fig. 6 is another embodiment's the flow chart of the method for description control pumping unit,

Fig. 7 shows the diagram of conventional pumps circulation,

Fig. 8 shows and uses the measurement result of the method for control pump equipment according to an embodiment of the invention,

Fig. 9 shows and uses the measurement result of the method for control pump equipment according to an embodiment of the invention,

Figure 10 is the diagram of submersible pump equipment.

Embodiment

Embodiments of the invention have been described in the following description.

Fig. 1 is embodiment's the flow chart of the method for description control pumping unit.The present embodiment of the method intention control pump equipment, it can be submersible type, comprises pump case, pump impeller and has the electric notor of electric winding, wherein, electric notor is arranged to be suitable for discharging for driving the pump impeller of fluid.

In first step 1, measure or monitor the temperature parameter T of the temperature of reflect heat part.This temperature parameter comprises the temperature value of the temperature of heat part.In other words, measure temperature parameter continuously or with regular interval or with irregular spacing during at least a portion of this time.In the operation period of pumping unit, this interval can be that be scheduled to or adjustable and/or adaptable.The heat part is the electric winding of the motor of pumping unit.Heat part is thermally coupled to fluid and can refers to the heat part and be arranged to carry out thermo-contact to allow hot transmission with fluid when fluid levels during higher than predetermined low level (this predetermined low level be above the ground level level, floor surface or have need the bottom surface in the space of the fluid of discharging), be that fluid levels need to higher than certain level, make the thermal coupling that can allow between heat part and fluid.In another embodiment, described predetermined low level can also be corresponding to such fluid levels, and on this fluid levels, pumping unit is suitable for discharging fluid.

In second step 2, calculate cooling rate value CRV.This calculating comprises based on two temperature values measuring at different time and comes the accounting temperature time-derivative with difference numerical method backward.Be understood that cooling rate on the occasion of corresponding to the hot portion temperature that descends.Described two temperature values are mutually to be close in time one after the other to measure.In other embodiments, can use two or more temperature values, described two or more temperature values can be mutually be close in time one after the other measure or one after the other measure in time, have the temperature value sample of the scheduled time or predetermined number at least between two temperature values that use in relatively.In another embodiment, this can be included in the difference of heat part, the i.e. comparison of the temperature value of at least two position measurements more in addition.Can also measure temperature value at the diverse location place of heat part, thus the temperature of the different piece of this temperature value reflect heat part.In other words, the comparison between at least two temperature values that the step of calculating the cooling rate value can be included in that different time measures and at least two temperature values measuring at the diverse location place of heat part.In other embodiments, the cooling rate value is thermal transmission coefficient.Can calculate this thermal transmission coefficient according to following formula:

T(τ)=T _fluid-(T(0)-T _fluid)*exp(-A*h/(m*Cp)*τ)

Wherein, T is hot portion temperature, and τ is cool time, T _FluidBe fluid temperature (F.T.), A, m and Cp are constants, and h is thermal transmission coefficient.

Second step 2 also comprises carries out the pumping operation analysis, comprise the cooling rate value CRV that calculates and with reference to the comparison between cooling rate value ref.Be selected as representing the specific cooling rate of the heat part that rises corresponding with the fluid levels of the described fluid that hot part is cooling with reference to the cooling rate value.The indication of that limit or the predetermined fluid levels of the user in the time of can being chosen as pumping unit and will discharging fluid with reference to the cooling rate value, the fluid levels when being about to start the pumping operation of pumping unit.If the cooling rate value is higher than reference cooling rate value, if namely the temperature of heat part is than reducing quickly under corresponding to the reference rate of reference cooling rate value, the method advances to third step 3, otherwise is back to first step 1.Be understood that cooling rate on the occasion of corresponding to the hot portion temperature that descends.

In third step 3, start pumping operation to discharge fluid.In other words, provide electric current to the electric winding of the motor of driven pump equipment, make the startup pumping operation.

Fig. 2 is another embodiment's the flow chart of the method for description control pumping unit.The present embodiment of the method intention control pump equipment, it can be submersible type, comprises pump case, pump impeller and has the electric notor of electric winding, wherein, electric notor is arranged to be suitable for discharging for driving the pump impeller of fluid.

In first step 20, start pumping operation to discharge fluid.In other words, provide electric current to the electric winding of the motor of driven pump equipment, make the startup pumping operation.

In second step 21, measure or monitor the temperature parameter T of the temperature of reflect heat part.Second step 21 is corresponding to shown in Figure 1 and at above-described embodiment's first step 1.

In third step 23, will equal the reference temperature value T of electrical current heat portion temperature T _lowBe stored in storage.Institute's stored reference temperature is corresponding to soon the temperature of heat part after starting pumping operation.Can use reference temperature value T _lowIndication or approximative value as fluid temperature (F.T.).

In the 4th step 24, measure or monitor the temperature parameter T of the temperature of reflect heat part.The 4th step 24 is corresponding to embodiment's shown in Figure 1 first step 1.

In the 5th step 25, carry out temperature analysis, comprise temperature value T and reference temperature value T _lowBetween difference and the comparison between reference difference k.If the difference between temperature value is greater than or equal to reference difference k, method advances to the 6th step 22, otherwise to the 7th step 26.In other words, the current temperature value of heat part is compared with reference temperature value and reference difference, wherein, afterwards both and preferably be selected as being in the level higher than fluid temperature (F.T.), make and can avoid not calculating exactly or the situation when at all not calculating cooling rate or minimize it.In other embodiments, as carrying out substituting of said temperature analysis, execution time analysis in the 5th step 25 comprises time and the predetermined time interval t that will pass by since being interrupted at last since pumping operation ₀Compare, pass by to be less than t if make ₀Time, method advances to the 6th step 22, otherwise to the 7th step 26.In another embodiment, carry out and replace temperature analysis, wherein, calculate the heating and cooling rate value and compare with reference heating and cooling rate value.When the heating and cooling rate value was less than or equal to reference to the heating and cooling rate value, the method advanced to the 6th step 22, otherwise to the 7th step 26.In other words, if the heat part is heated with the speed higher than reference value, not yet realize equalized temperature, and heat therefore and should continue, namely method should advance to the 7th step.

In the 6th step 22, calculate cooling rate value CRV.Second step 2 also comprises carries out the pumping operation analysis, comprise the cooling rate value CRV that calculates and with reference to the comparison between cooling rate value ref.The 6th step is corresponding to shown in Figure 1 and at above-described embodiment's second step 2.If the cooling rate value is higher than reference cooling rate value, if namely the temperature of heat part is than reducing quickly under corresponding to the reference rate of reference cooling rate value, the method advances to third step 20, otherwise is back to the 4th step 24.

In the 7th step 26, by means of presenting electric current by the electric winding of motor, heat is partly heated.This electric current has the size of the pump impeller rotation that makes pumping unit.The heat part is heated by means of the heat loss in electric notor and the heat transmission between it.In other embodiments, electric current can have the non-rotary size of the pump impeller of making.In other embodiments, electric current can be DC type for example, makes pump impeller not rotate.In other embodiments, the heat part is by independent heating element heating, and this independent heating element can be electrical heating elements.In other embodiments, the heat part can be by electrically heated temperature transducer.In other embodiments, can omit the 7th step fully, usually for example ambient temperature is fully in the environment higher than fluid temperature (F.T.) around, and the heat part can have the temperature identical with ambient temperature.In this case, the heat part does not require initiatively heating, thereby guarantees passively abundant and suitable temperature difference.After the 7th step, the method advances to the 4th step 24.

Fig. 3 is another embodiment's the flow chart of the method for description control pumping unit.The present embodiment of the method intention control pump equipment, it can be submersible type, comprises pump case, pump impeller and has the electric notor of electric winding, wherein, electric notor is arranged to be suitable for discharging for driving the pump impeller of fluid.

In first step 30, start pumping operation to discharge fluid.In other words, provide electric current to the electric winding of the motor of driven pump equipment, make the startup pumping operation.

In second step 37, the motor load parameter of the load of the motor of (during pumping operation) measurement or supervision reflected pump equipment.This load parameter comprises the motor load value of the motor load of motor.The motor load value is the tolerance that is supplied to the power of motor.In the situation that electric notor, this motor load value can be for example the cosine of the phase difference phi between voltage and current on the electric winding of electric notor of pumping unit.The low value of the cosine of phase difference is corresponding to the large phase difference between electric current and voltage, and it can be the indication of low motor load.In other embodiments, the motor load value can be the electric current by the electric winding of electric notor.

In third step 38, carry out the motor load analysis, comprise the motor load value and with reference to the comparison between the motor load value.Can represent the pumping unit any fluid of not pumping, motor load value when namely doing running in essence with reference to the motor load value.If the motor load value is lower than reference motor load value, method advances to the 4th step 39, otherwise returns to second step 37.Be understood that low motor load value corresponding to the low-load of motor, namely realizes pumping work seldom.

In the 4th step 39, stop pumping operation, thereafter, the method advances to the 5th step 34.

In the 5th step 34, measure or monitor the temperature parameter T of the temperature of reflect heat part.The 5th step 34 is corresponding to shown in Figure 1 and at above-described embodiment's first step 1.

In the 6th step 32, calculate cooling rate value CRV.The 6th step 32 also comprises carries out the pumping operation analysis, comprise the cooling rate value CRV that calculates and with reference to the comparison between cooling rate value ref.The 6th step is corresponding to shown in Figure 1 and at above-described embodiment's second step 2.If the cooling rate value is higher than reference cooling rate value, if namely the temperature of heat part is than reducing quickly under corresponding to the reference rate of reference cooling rate value, the method advances to third step 30, otherwise is back to the 5th step 34.

Fig. 4 is another embodiment's the flow chart of the method for description control pumping unit.The present embodiment of the method intention control pump equipment, it can be submersible type, comprises pump case, pump impeller and has the electric notor of electric winding, wherein, electric notor is arranged to be suitable for discharging for driving the pump impeller of fluid.

In first step 40, start pumping operation to discharge fluid.In other words, provide electric current to the electric winding of the motor of driven pump equipment, make the startup pumping operation.

In second step 41, measure or monitor the temperature parameter T of the temperature of reflect heat part.Second step 21 is corresponding to shown in Figure 1 and at above-described embodiment's first step 1.

In third step 43, will equal the reference temperature value T of electrical current heat portion temperature T _lowBe stored in storage.Institute's stored reference temperature value is corresponding to soon the temperature of heat part after starting pumping operation.Can use reference temperature value T _lowIndication or approximative value as fluid temperature (F.T.).

In the 4th step 47, the motor load parameter of the load of the motor of (during pumping operation) measurement or supervision reflected pump equipment.The 4th step is corresponding to shown in Figure 3 and at above-described embodiment's second step 37.

In the 5th step 48, carry out the motor load analysis, comprise the motor load value and with reference to the comparison between the motor load value.Can represent the pumping unit any fluid of not pumping, motor load value when namely doing running in essence with reference to the motor load value.If the motor load value is lower than reference motor load value, method advances to the 6th step 44, otherwise returns to the 4th step 47.Be understood that low motor load value corresponding to the low-load of motor, namely realizes pumping work seldom.

In the 6th step 44, measure or monitor the temperature parameter T of the temperature of reflect heat part.The 6th step 44 is corresponding to second step 41.

In the 7th step 45, carry out temperature analysis, comprise temperature value T and reference temperature value T _lowBetween difference and the comparison between reference difference k.If the difference between temperature value is higher than reference difference k, method advances to the 8th step 49, otherwise to the 9th step 46.In other words, the current temperature value of heat part is compared with reference temperature value and reference difference, wherein, afterwards both and preferably be selected as being in the level higher than fluid temperature (F.T.), make and can avoid not calculating exactly or the situation when at all not calculating cooling rate or minimize it.Reference difference k can be alternatively temperature value T and/or reference temperature value T _lowFunction, for example index, linearity or polynomial function.In other embodiments, as carrying out substituting of said temperature analysis, execution time analysis in the 7th step 45 comprises time and the predetermined time interval t that will pass by since being interrupted at last since pumping operation ₀Compare, pass by to be less than t if make ₀Time, method advances to the 8th step 49, otherwise to the 9th step 46.In other embodiments, carry out in the 7th step 45 and replace temperature analysis, wherein, as temperature value T and reference temperature value T _lowFunction calculate rate of heat addition value (HRV), and HRV is compared with reference difference k, reference difference k can be constant or temperature value T and/or reference temperature value T _lowFunction, for example index, linearity or polynomial function.

In the 8th step 49, stop pumping operation, thereafter, the method advances to the tenth step 410.

In the 9th step 46, by means of presenting electric current by the electric winding of motor, heat is partly heated.The 9th step 46 is corresponding to shown in Figure 2 and in above-described embodiment's the 7th step 26.

In the tenth step 410, measure or monitor the temperature parameter T of the temperature of reflect heat part.The tenth step 410 is corresponding to second step 41.

In the 11 step 42, calculate cooling rate value CRV.The 11 step 42 also comprises carries out the pumping operation analysis, comprise the cooling rate value CRV that calculates and with reference to the comparison between cooling rate value ref.The 11 step is corresponding to shown in Figure 1 and at above-described embodiment's second step 2.If the cooling rate value is higher than reference cooling rate value, if namely the temperature of heat part is than reducing quickly under corresponding to the reference rate of reference cooling rate value, the method advances to first step 40, otherwise is back to the tenth step 410.

Fig. 5 is another embodiment's the flow chart of the method for description control pumping unit.The present embodiment of the method intention control pump equipment, it can be submersible type, comprises pump case, pump impeller and has the electric notor of electric winding, wherein, electric notor is arranged to be suitable for discharging for driving the pump impeller of fluid.

In first step 50, start pumping operation to discharge fluid.In other words, provide electric current to the electric winding of the motor of driven pump equipment, make the startup pumping operation.

In second step 51, measure or monitor the temperature parameter T of the temperature of reflect heat part.Second step 51 is corresponding to shown in Figure 1 and at above-described embodiment's first step 1.

In third step 53, will equal the reference temperature value T of electrical current heat portion temperature T _lowBe stored in storage.Institute's stored reference temperature is corresponding to soon the temperature of heat part after starting pumping operation.Can use reference temperature value T _lowIndication or approximative value as fluid temperature (F.T.).

In the 4th step 57, the motor load parameter of the load of the motor of (during pumping operation) measurement or supervision reflected pump equipment.The 4th step is corresponding to shown in Figure 3 and at above-described embodiment's second step 37.

In the 5th step 58, carry out the motor load analysis, comprise the motor load value and with reference to the comparison between the motor load value.Can represent the pumping unit any fluid of not pumping, motor load value when namely doing running in essence with reference to the motor load value.If the motor load value is lower than reference motor load value, method advances to the 6th step 511, otherwise returns to the 4th step 57.Be understood that low motor load value corresponding to the low-load of motor, namely realizes pumping work seldom.

In the 6th step 511, will equal the temperature value T of electrical current heat portion temperature T _PrevBe stored in storage.

In the 7th step 54, measure or monitor the temperature parameter T of the temperature of reflect heat part.The 7th step 54 is corresponding to second step 51.

In the 8th step 55, carry out temperature analysis, comprise temperature value T and reference temperature value T _lowBetween difference and the comparison between reference difference k.If the difference between temperature value is higher than reference difference k, method advances to the 8th step 59, otherwise to the tenth step 512.In other words, the current temperature value of heat part is compared with reference temperature value and reference difference, wherein, afterwards both and preferably be selected as being in the level higher than fluid temperature (F.T.), make and can avoid not calculating exactly or the situation when at all not calculating cooling rate or minimize it.Reference difference k can be alternatively temperature value T and/or reference temperature value T _lowFunction, for example index, linearity or polynomial function.In other embodiments, as carrying out substituting of said temperature analysis, execution time analysis in the 8th step 55 comprises time and the predetermined time interval t that will pass by since being interrupted at last since pumping operation ₀Compare, pass by to be less than t if make ₀Time, method advances to the 9th step 59, otherwise to the tenth step 512.In other embodiments, carry out in the 8th step 55 and replace temperature analysis, wherein, as temperature value T and reference temperature value T _lowFunction calculate rate of heat addition value (HRV), and HRV is compared with the reference difference k that can be constant as above or function.

In the 9th step 59, stop pumping operation, thereafter, the method advances to the 12 step 513.

In the tenth step 512, carry out temperature analysis, comprise temperature value T and temperature value T _PrevBetween difference and the comparison between reference difference m.If the difference between temperature value is greater than or equal to reference difference m, method advances to the 11 step 56, otherwise to the 9th step 59.In other words, the current temperature value of heat part is compared with last temperature value (it is stored in storage).If should be poor less than reference difference m, temperature changes with speed slowly, and therefore to advance to heating steps 56 be nonsensical.Therefore, method alternatively advances to and stops pumping operation.Reference difference m can be alternatively temperature value T and/or temperature value T _PrevFunction, for example index, linearity or polynomial function.In other embodiments, carry out in the tenth step 512 and replace temperature analysis, wherein, as temperature value T and reference temperature value T _lowFunction calculate rate of heat addition value (HRV), and HRV is compared with the reference difference m that can be constant as above or function.

In the 11 step 56, by means of presenting electric current by the electric winding of motor, heat is partly heated.The 11 step 56 is corresponding to shown in Figure 2 and in above-described embodiment's the 7th step 26.

In the 12 step 513, method was waited for predetermined time interval before advancing to the 13 step 510.Carry out this and wait for that step is for allowable temperature settles out after pumping operation is stopped, thereby realize more predictable pumping operation analysis in the 14 step.

In the 15 step 510, measure or monitor the temperature parameter of the temperature of reflect heat part.The 13 step 510 is corresponding to second step 51.

In the 14 step 52, calculate cooling rate value CRV.The 14 step 52 also comprises carries out the pumping operation analysis, comprise the cooling rate value CRV that calculates and with reference to the comparison between cooling rate value ref.The 14 step is corresponding to shown in Figure 1 and at above-described embodiment's second step 2.If the cooling rate value is higher than reference cooling rate value, if namely the temperature of heat part is than reducing quickly under corresponding to the reference rate of reference cooling rate value, the method advances to first step 50, otherwise is back to the 15 step 514.

In the 15 step 514, carry out temperature analysis, comprise temperature value T and reference temperature value T _lowBetween difference and the comparison between reference difference k.If the difference between temperature value is higher than reference difference k, method advances to the 13 step 510, otherwise to first step 50.In other words, the current temperature value of heat part is compared with reference temperature value and reference difference, wherein, afterwards both and preferably be selected as being in the level higher than fluid temperature (F.T.), make and can avoid not calculating exactly or the situation when at all not calculating cooling rate or minimize it.In other embodiments, as carrying out substituting of said temperature analysis, execution time analysis in the 15 step 514 comprises time and the predetermined time interval t that will pass by since being stopped at last since pumping operation ₀Compare, pass by to be less than t if make ₀Time, method advances to the 13 step 510, otherwise to first step 50.

Fig. 6 is another embodiment's the flow chart of the method for description control pumping unit.The present embodiment of the method intention control pump equipment, it can be submersible type, comprises pump case, pump impeller and has the electric notor of electric winding, wherein, electric notor is arranged to be suitable for discharging for driving the pump impeller of fluid.

Embodiment shown in Figure 6 is similar to the embodiment in Fig. 5, except two details.At first, comprise the 16 step 517, wherein, will equal the temperature value T of electrical current heat portion temperature T _PrevBe stored in storage.Secondly, the 15 step 516 comprises the execution temperature analysis, comprises temperature value T and temperature value T _PrevBetween difference and the comparison between reference difference m.If the difference between temperature value is greater than or equal to reference difference m, method advances to the 13 step 510, otherwise is back to first step 50.In other words, the current temperature value of heat part is compared with last temperature value (it is stored in storage).If should be poor less than reference difference m, temperature changes with speed slowly, and therefore the method advances to and alternatively stop pumping operation.Reference difference m can be alternatively temperature value T and/or temperature value T _PrevFunction, for example index, linearity or polynomial function.In other embodiments, carry out in the 15 step 516 and replace temperature analysis, wherein, as temperature value T and reference temperature value T _lowFunction calculate rate of heat addition value (HRV), and HRV is compared with the reference difference m that can be constant as above or function.

Fig. 7 is the diagram of conventional pumping circulation.At time t=0, the beginning pumping operation.Water level begins to reduce with linear velocity, and the temperature of heat part increases and close to the about equilibrium values of 30 degree.At time t=0.052, pump begins to send snore, and namely water has reached such level, and in this level, pump is not in the situation that have water to turn round.Come coolant pump owing to lacking water, the temperature of heat part begins to increase.At t=0.068, pumping operation stops, because the temperature of heat part has reached the upper limit of 50 degree.In about identical time, water level begins to increase with linear velocity.When water has reached 0.30 level, again begin pumping operation.

Fig. 8 shows the cooling gradient as the function of normalizing heat-transmission portion temperature for three illustrated examples.Also shown is the example (ref stop condition) with reference to the cooling rate value function.The first curve is the example of quick cooling procedure, namely rises rapidly and/or fluid temperature (F.T.) when low when fluid levels.When normalizing heat-transmission portion temperature has reached 0.92, gradient with reference to cooling rate value curved intersection, therefore and can begin pumping operation.The second curve is the Slow cooling process, namely rises lentamente and/or fluid temperature (F.T.) when relatively high when fluid levels.When normalizing heat-transmission portion temperature has reached 0.75, gradient with reference to cooling rate value curved intersection, therefore and can begin pumping operation.The 3rd curve is the example that only relates to the cooling procedure of air, namely when pumping unit be when doing or when not having thermo-contact between heat part and fluid.When normalizing heat-transmission portion temperature has reached 0.46, gradient with reference to cooling rate value curved intersection, therefore and can begin pumping operation.It should be noted that the normalization temperature in the time of will beginning pumping operation changes widely along with the speed of cooling procedure.

Fig. 9 shows normalizing heat-transmission portion temperature and the fluid levels as the function of time for same example shown in Figure 8.In the example of quick cooling procedure, the place begins pumping operation at about 0.25 fluid levels, and in the example of Slow cooling process, and the place begins pumping operation at about 0.2 fluid levels.Therefore do not use fluid level sensor even measurement result shows, can use method according to an embodiment of the invention and at quite consistent fluid levels place priming pump equipment yet.What will also be understood that from these examples is to compare with normalizing heat-transmission portion temperature, and cooling rate is relevant to fluid levels more strongly.Based on all survey data as shown here, can make with reference to cooling rate value function (as shown in Figure 8) optimization to realize the low discrete of fluid levels in the time will beginning pumping operation.In the example of Air-cooling Process, at first fluid levels is low, and the fluid levels (not shown in FIG.) when therefore pumping operation begins is unsuitable with other two examples.

Figure 10 is the illustrated sectional drawing of submersible pump equipment 101 according to a second aspect of the invention.Pumping unit 101 has columniform shape in essence, and is arranged to aim at vertically in fluid, and pumping unit 101 can be immersed in fluid.Pumping unit 101 has upper pump case part 106 and lower pump case part 105.The bottom of lower pump case part has the surrounding layer surface of perforation to allow intake tunnel 107 and to be communicated with around the fluid between the fluid of pumping unit.In lower pump case part 105 inside, be furnished with pump impeller 108.Pump impeller is coupled to electric notor to allow the transmission of the rotating force between it.On the top of upper pump case part 106, be furnished with fluid output adpting flange 107, it radially extends from columniform pump case in essence.Fluid output connector 107 is coupled to the inside of lower pump case part 105 via upper pump case part 106 by fluid, making can be from pumping fluid around pumping unit, by the perforation surrounding layer surface of lower pump case part 105, upwards by pump case and via exporting adpting flange from pumping unit out.Being electrically connected to 104 is disposed on the upper surface of pump case part 106.This electrical connection is suitable for being coupled to control unit.This electrical connection comprises that also wiring is with being electrically connected between the temperature transducer in controller being provided and being arranged in pump case inside.Be used for the control unit of control pump equipment generally include one or more microprocessors or have computing capability certain other during, such as micro controller unit (MCU), personal digital assistant device (DSP), specific integrated circuit (ASIC), field programmable gate array (FPGA), CPLD (CPLD) etc. carries out being stored in such as the suitable downloadable software in the suitable storage area of RAM, flash memory or hard disk simultaneously.This controller receives signal and processes these signals to acquire the control signal of pump or pumping unit from sensor.Temperature transducer is arranged to carry out thermo-contact with the electric winding 102 of electric notor.The electricity winding 102 partly by stator 103 around.Motor is disposed in pump case inner bottom with pumping unit at a distance of the certain altitude place, makes electric winding be in to make at fluid levels and wishes to bring into operation pumping unit when discharging the level of fluid and fluid carries out thermo-contact (to allow the heat transmission between it).Controller also comprises for by means of monitoring motor load via being electrically connected to 104 electric current and the voltages of measuring on motor, makes the device that can interrupt pumping during lower than reference value (thereby indication fluid levels be in make pumping unit do in essence the low-level of running) when motor load.

Although illustrated and described exemplary embodiment of the present invention, it is evident that for a person skilled in the art many changes and modification or the change that can carry out invention as herein described.Therefore, be understood that and above description of the present invention and accompanying drawing should be considered as its non-limiting example, and define scope of the present invention in claims.

Claims

1. a control is used for discharging the method for the pumping unit of fluid, and described method comprises step:

-hot part is provided, described heat part is suitable for being in or being thermally coupled to described fluid to allow the heat transmission between it during higher than certain level at fluid;

-monitoring the temperature parameter of the temperature of the described heat part of reflection, described temperature parameter comprises the temperature value of the temperature of described heat part,

-calculate cooling rate value (CRV), described calculating is included in the comparison between at least two temperature values that different time measures,

-carry out the pumping operation analysis, described pumping operation analysis comprise current cooling rate value (CRV) with reference to the comparison between cooling rate value (ref), describedly represent described heat specific cooling rate partly with reference to the cooling rate value; And

If it is described with reference to the cooling rate value that-described cooling rate value equals or exceeds, start pumping operation to discharge described fluid.

2. method according to claim 1, described method also comprises step: described heat part is heated to certain temperature or higher than the temperature difference of the temperature of described fluid.

3. method according to claim 1, described method also comprises step: if described temperature value and reference temperature value (T _low) between difference be equal to or less than reference difference (k), with described heat part heating.

4. according to claim 2 or 3 described methods, described method also comprises step: if pumping operation is at predetermined time interval (t ₀) do not start afterwards, repeat the described step with the heating of described heat part.

5. the described method of any one according to claim 2 to 4, wherein, comprise the described hot partly described step of heating with described hot part electric heating.

6. the described method of any one according to claim 2 to 4 wherein, comprises with the motor that is suitable for driving described pumping unit that with the described step of described heat part heating with the heating of described heat part, described motor is thermally coupled to described hot part.

7. method according to claim 6, wherein, described heat part is the part of described motor.

8. method described according to any one in aforementioned claim, described method also comprises step: at least one the motor load parameter that monitors the load of reflection motor, described motor is arranged to be used to driving described pumping unit, and described load parameter comprises the motor load value of the motor load of described motor.

9. method according to claim 8, described method also comprises step: if described motor load value is interrupted described pumping operation lower than reference motor load value.

10. the described method of any one according to claim 8 to 9, wherein, described motor is electric notor, and wherein, described motor load value is based on the cosine of the phase difference (phi) between the voltage and current on the electric winding of described electric notor.

11. the described method of any one according to claim 6 to 10, wherein, described motor is electric notor, and wherein, described heat part is the electric winding of described electric notor.

12. the described method of any one according to claim 2 to 11, wherein, described method also comprises step:

-monitoring the fluid temperature (F.T.) parameter of the temperature of the described fluid of reflection, described fluid temperature (F.T.) parameter comprises the fluid temperature (F.T.) value of the temperature of described fluid; And

-revise at least one in following parameter with respect to described fluid temperature (F.T.) value: described reference temperature value (T _low), described reference difference (k), described with reference to cooling rate value (ref).

13. method described according to any one in aforementioned claim, wherein, described pumping unit is submersible pump.

14. method described according to any one in aforementioned claim, wherein, described cooling rate value is the time-derivative of the described temperature of described heat part.

15. method described according to any one in aforementioned claim, wherein, described cooling rate value is the thermal transmission coefficient of described heat part.

16. method described according to any one in aforementioned claim, wherein, described is the function of described hot portion temperature or the function of normalized hot portion temperature with reference to the cooling rate value.

17. method according to claim 16, wherein, described function is the index function.

18. method described according to any one in aforementioned claim, wherein, described at least two temperature values are average temperature values.

19. a control apparatus that is used for control pump equipment, described pumping unit are used for discharging fluid, described equipment comprises

Hot part, described heat part are suitable for being in or being thermally coupled to described fluid during higher than certain level at fluid;

The first temperature transducer, described the first temperature transducer are used for monitoring the temperature of described heat part, and described the first temperature transducer is suitable for providing the temperature sensor signal of the temperature that represents described heat part; And

Controller, described controller are suitable for applying control signal to attachable pumping unit, and described controller also is suitable for

Calculate cooling rate value (CRV) from the first temperature sensor signal of different time based at least two temperature values measuring at different time;

The execution pumping operation is analyzed, described pumping operation analysis comprise current cooling rate value (CRV) with reference to the comparison between cooling rate value (ref), describedly represent described heat specific cooling rate partly with reference to the cooling rate value; And

If described cooling rate value equals or exceeds described with reference to the cooling rate value, apply control signal to start pumping operation to discharge described fluid to attachable pumping unit.

20. control apparatus according to claim 19, wherein, described controller also is suitable for applying control signal to heating equipment, described heating equipment is suitable for described heat part is heated to certain temperature or higher than the temperature difference of the temperature of described fluid, causes the temperature difference between described heat part and described fluid.

21. control apparatus according to claim 19, wherein, if described control apparatus also is suitable for described temperature value and reference temperature value (T _low) between difference be equal to or less than reference difference (k), apply control signal with described heat part heating to described heating equipment.

22. according to claim 20 or 21 described control apparatuss, wherein, if described controller also is suitable at predetermined time interval (t ₀) do not start afterwards pumping operation, restart the heating of described heat part.

23. the described control apparatus of any one according to claim 20 to 22, wherein, described heating equipment is suitable for described hot part electric heating.

24. the described control apparatus of any one according to claim 20 to 22, wherein, described heating equipment comprises motor, and described motor is suitable for being thermally coupled to described hot part, and making can be to described hot part transferring heat in the operation period of described motor.

25. the described control apparatus of any one according to claim 19-24, wherein, described heat part is the part that can be connected to the motor of described control apparatus.

26. the described control apparatus of any one according to claim 19-25, wherein, described control apparatus comprises the device for the motor load that monitors the motor that can be connected to described control apparatus, described motor is suitable for driving described pumping unit, and wherein, be used for monitoring that the described device of described motor load is suitable for providing the motor load that represents described motor load signal.

27. control apparatus according to claim 26 wherein, if described controller also is suitable for motor load value from described motor composite signal lower than reference motor load value, applies control signal to interrupt pumping operation to described pumping unit.

28. according to claim 26 or 27 described control apparatuss, wherein, described motor load value is based on the cosine of the phase difference (phi) between the voltage and current on the electric winding of described electric notor.

29. the described control apparatus of any one according to claim 24 to 28, wherein, described motor is electric notor, and wherein, described heat part is at least a portion of the electric winding of described electric notor.

30. the described control apparatus of any one according to claim 20 to 29, wherein, described equipment also comprises the second temperature transducer be used to the temperature that monitors described fluid, and described the second temperature transducer is suitable for providing the second temperature sensor signal that represents described fluid temperature (F.T.); And

Wherein, described controller also be suitable for respect to revise from the fluid temperature (F.T.) value of described the second temperature sensor signal in following parameter at least one:

Described reference temperature value (T _low),

Described reference difference (k), and

Described with reference to cooling rate value (ref).

31. the described control apparatus of any one according to claim 19-30, wherein, described pumping unit is submersible pump.

32. the described equipment of any one according to claim 19-31, wherein, described cooling rate value is the time-derivative of the described temperature of described heat part.

33. the described equipment of any one according to claim 19-32, wherein, described cooling rate value is the thermal transmission coefficient of described heat part.

34. the described equipment of any one according to claim 19-33, wherein, described is the function of described hot portion temperature or the function of normalized hot portion temperature with reference to the cooling rate value.

35. equipment according to claim 34, wherein, described function is the index function.

36. the described equipment of any one according to claim 19-35, wherein, described at least two temperature values are average temperature values.

37. a pumping system comprises the described control apparatus of any one in pumping unit and according to claim 19-36.

38. described pumping system according to claim 37, wherein, described control apparatus and described pumping unit are in aggregates.

39. described pumping system according to claim 38, wherein, described control apparatus removably is connected with described pumping unit.