CN115823786B - Anti-freezing control method and device for unit and water chilling unit - Google Patents
Anti-freezing control method and device for unit and water chilling unit Download PDFInfo
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- CN115823786B CN115823786B CN202211573099.5A CN202211573099A CN115823786B CN 115823786 B CN115823786 B CN 115823786B CN 202211573099 A CN202211573099 A CN 202211573099A CN 115823786 B CN115823786 B CN 115823786B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 137
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000007710 freezing Methods 0.000 title claims abstract description 41
- 230000008859 change Effects 0.000 claims abstract description 21
- 238000012790 confirmation Methods 0.000 claims description 18
- 230000002528 anti-freeze Effects 0.000 claims description 11
- 238000004590 computer program Methods 0.000 claims description 10
- 230000006870 function Effects 0.000 claims description 6
- 238000005057 refrigeration Methods 0.000 claims description 6
- 230000003213 activating effect Effects 0.000 claims description 4
- 230000004044 response Effects 0.000 claims description 4
- 230000008014 freezing Effects 0.000 abstract description 6
- 238000005336 cracking Methods 0.000 abstract description 5
- 230000002265 prevention Effects 0.000 abstract description 2
- 239000003507 refrigerant Substances 0.000 description 20
- 230000008569 process Effects 0.000 description 9
- 230000007423 decrease Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000010977 unit operation Methods 0.000 description 2
- 108010053481 Antifreeze Proteins Proteins 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention discloses a method and a device for controlling unit freezing prevention and a water chilling unit. Wherein the method comprises the following steps: responding to the low-voltage protection instruction, and acquiring the air suction temperature and the air suction temperature change value before the low-voltage protection occurrence time; and if the suction temperature is less than or equal to a first preset threshold value and the suction temperature variation value is less than or equal to a second preset threshold value, executing anti-freezing control. According to the invention, through sensing the low pressure, the air suction temperature and the air suction temperature change, the water flow state in the water side heat exchanger can be timely and accurately judged, and the anti-freezing control measures are timely taken under the condition that the water shortage of the unit is judged, so that the running of the water chilling unit in the water-free state is avoided, the risk of freezing of the water side heat exchanger is reduced, the anti-freezing reliability of the water chilling unit is improved, the anti-freezing is more independent and effective, and the problem of the frost cracking of a shell tube caused by the running of the unit in the water-free state is solved.
Description
Technical Field
The invention relates to the technical field of units, in particular to a unit antifreezing control method and device and a water chilling unit.
Background
The secondary refrigerant of the conventional water chilling unit generally adopts water, the situation that the complete machine is invalid due to the fact that water freezes and freezes to damage a shell pipe easily occurs in refrigeration, the phenomenon is caused by reasons such as insufficient water flow, water channel blockage or water pump failure, and the like, the shell pipe is invalid to lead to water inflow of the system, and therefore most accessories of a host system are damaged.
In order to solve the above problems, the most widely used method is to set a temperature controller or a flow switch, and when the outlet temperature of the cold water is lower than 3 ℃ or the flow of the cold water is lower than a protection value, the protection switch acts to stop the operation of the water chiller.
However, in actual situations, engineering maintenance personnel neglect to start the water pump before starting the host, or the water system is blocked, or related valves are not started, and the above reasons may lead to no-water flow operation, and the flow switch may fail, and the water outlet temperature sensing bulb is placed at the water outlet of the shell pipe, so that hysteresis exists in sensing the temperature inside the shell, and the protection mechanism fails or is not timely. Under the above conditions, if the unit is continuously started and operated, the shell and tube is easy to frost crack.
Aiming at the problem of frost cracking of a shell and tube caused by unit operation in a state of no water flow in the prior art, no effective solution is proposed at present.
Disclosure of Invention
The embodiment of the invention provides a method and a device for controlling freezing prevention of a unit and a water chilling unit, which are used for at least solving the problem that a shell pipe is frozen and cracked due to unit operation in a no-water flow state in the prior art.
In order to solve the technical problems, the embodiment of the invention provides a unit anti-freezing control method, which comprises the following steps:
Responding to the low-voltage protection instruction, and acquiring the air suction temperature and the air suction temperature change value before the low-voltage protection occurrence time;
And if the suction temperature is less than or equal to a first preset threshold value and the suction temperature variation value is less than or equal to a second preset threshold value, executing anti-freezing control.
Optionally, performing the antifreeze control includes:
Closing the throttling element and the compressor;
And outputting a reminding message to remind a user to check whether the water flows of the water pump and the water system are normal.
Optionally, closing the throttling element and the compressor comprises: and immediately closing the throttling element, and closing the compressor after a first preset time.
Optionally, after outputting the alert message, the method further includes: and after the second preset time, activating a confirmation function, and when a confirmation instruction is received, continuing starting up and running of the unit.
Optionally, acquiring the suction temperature and the suction temperature variation value before the low-voltage protection occurrence time includes:
Acquiring the air suction temperature of each moment in a third preset time before the low-voltage protection occurrence moment, and calculating the average value of the air suction temperature of each moment to be used as the air suction temperature before the low-voltage protection occurrence moment;
And obtaining the suction temperature of each moment in a fourth preset time before the low-voltage protection occurrence moment, calculating the difference value between the suction temperature of any moment in the fourth preset time and the suction temperature of the last moment to obtain at least one difference value, and then calculating the average value of the at least one difference value to be used as the suction temperature change value before the low-voltage protection occurrence moment.
Optionally, before responding to the low-voltage protection instruction, the method further comprises: starting the compressor in response to a start-up refrigeration instruction; detecting a low pressure when the compressor on time is less than or equal to a fifth preset time; and outputting the low-pressure protection instruction when the low-pressure is detected to be smaller than the preset pressure.
The embodiment of the invention also provides an antifreezing control device for the unit, which comprises:
the acquisition module is used for responding to the low-voltage protection instruction and acquiring the air suction temperature and the air suction temperature change value before the low-voltage protection occurrence moment;
And the control module is used for executing anti-freezing control if the suction temperature is smaller than or equal to a first preset threshold value and the suction temperature change value is smaller than or equal to a second preset threshold value.
The embodiment of the invention also provides a water chilling unit, which comprises: the invention provides an antifreezing control device for a unit.
The embodiment of the invention also provides computer equipment, which comprises: memory, a processor and a computer program stored on the memory and executable on the processor, which processor implements the steps of the method according to the embodiments of the invention when the computer program is executed.
The embodiments of the present invention also provide a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method of the embodiments of the present invention.
By adopting the technical scheme, the water flow state in the water side heat exchanger can be timely and accurately judged by sensing the low pressure, the air suction temperature and the air suction temperature change, and the anti-freezing control measures can be timely adopted under the condition that the water shortage of the unit is judged, so that the running of the water chilling unit in the water-free state is avoided, the risk of icing of the water side heat exchanger is reduced, the anti-freezing reliability of the water chilling unit is improved, the anti-freezing is more independent and effective, and the problem of frost cracking of a shell and a tube caused by the running of the unit in the water-free state is solved.
Drawings
FIG. 1 is a flow chart of a method for controlling freeze protection of a unit according to an embodiment of the invention;
fig. 2 is a schematic diagram of a water chiller provided in a second embodiment of the present invention;
FIG. 3 is a flow chart of the anti-freezing control of the unit provided by the second embodiment of the invention;
Fig. 4 is a block diagram of a unit antifreeze control device according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that the terms "first," "second," and the like in the description and the claims and drawings of the present invention are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.
Alternative embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
The embodiment provides a unit anti-freezing control method, which can be applied to a water chiller, and fig. 1 is a flowchart of the unit anti-freezing control method provided by the embodiment of the invention, as shown in fig. 1, and the method comprises the following steps:
S101, responding to a low-voltage protection instruction, and acquiring an air suction temperature and an air suction temperature change value before the low-voltage protection occurrence time.
S102, if the suction temperature is smaller than or equal to a first preset threshold value and the suction temperature variation value is smaller than or equal to a second preset threshold value, anti-freezing control is executed.
The first preset threshold and the second preset threshold are thresholds for representing that the unit is in a water shortage state, and the first preset threshold and the second preset threshold can be preset according to the actual condition of the unit.
The value range of the first preset threshold value can be-20-50 ℃.
The water in the water system of the water chilling unit continuously flows under the action of the water pump, and when in refrigeration, the refrigerant absorbs the heat of the water in the shell pipe of the water side heat exchanger to evaporate into refrigerant gas, the water can be cooled in the process, the heat exchange can be formed only when the temperature difference between the refrigerant and the water exists, and the temperature difference is relatively stable under the condition that the water system normally supplies water. When the water system is abnormal (such as abnormal closing of a water pump, blockage of the water system, abnormal closing of a valve and the like), water in the water system does not flow any more, a small amount of residual water exists in the shell pipe and is in a static state, at the moment, the small amount of water is continuously cooled, and the refrigerant pressure is low due to the fact that the temperature of the water is too low, so that a low-pressure protection value state is achieved, and low-pressure protection appears. The synchronous suction temperature also decreases, and when the suction temperature approaches the freezing point (0 ℃), the danger of icing in the shell tube can be determined, and the less the residual water is, the more the suction temperature decreases.
When the low-pressure protection of the unit occurs, the unit is possibly caused by lack of refrigerant and possibly caused by lack of water, and whether the low-pressure protection is caused by lack of water of the unit can be timely and accurately judged by combining the suction temperature and the variation trend of the suction temperature, and the water side heat exchanger is at risk of icing due to lack of water of the unit, so that the embodiment combines the conditions of low-pressure, suction temperature and suction temperature to perform anti-freezing control. The air suction temperature can reflect the temperature of the refrigerant in the water side heat exchanger, the temperature of cold water outlet is not required to be detected, hysteresis does not exist, no matter whether the unit is free of water before starting or is suddenly cut off in the starting process or is free of water in the running process, the anti-freezing control can be carried out more timely based on the air suction temperature and the change condition of the air suction temperature, and the anti-freezing prejudgement performance is improved.
According to the embodiment, the water flow state in the water side heat exchanger can be timely and accurately judged by sensing the low pressure, the air suction temperature and the air suction temperature change, and the anti-freezing control measures are timely taken under the condition that the water shortage of the unit is judged, so that the running of the water chilling unit in the water-free state is avoided, the freezing risk of the water side heat exchanger is reduced, the anti-freezing reliability of the water chilling unit is improved, the freezing is more independent and effective, and the problem that the frost crack of a shell tube is caused by the running of the unit in the water-free state is solved.
In one embodiment, performing freeze protection control includes: closing the throttling element and the compressor; and outputting a reminding message to remind a user to check whether the water flows of the water pump and the water system are normal.
The throttling element is a device positioned between the air-cooled heat exchanger and the water side heat exchanger, and can be an electronic expansion valve and the like. The alert message may be output in at least one of the following ways: display screen display, voice playing and lamplight.
According to the embodiment, the throttling element and the compressor are closed, so that the refrigerant can be prevented from continuously absorbing heat in the shell tube of the water side heat exchanger to form the result of aggravating frost cracking; through the reminding message, a protection mechanism can be initiated in operation, and a user is reminded to check the water system to respond operation, so that hidden danger is timely checked.
Further, closing the throttling element and the compressor, comprising: the throttling element is immediately closed, and after a first preset time, the compressor is closed. The first preset time may be set according to the actual situation of the unit, for example, the first preset time is set to 3 seconds.
In the embodiment, when water is lack in the shell tube of the water side heat exchanger, if the refrigerant is kept in the shell tube, the icing speed is increased, so that the throttling element is immediately closed to prevent the refrigerant from flowing to the shell tube further; after the throttling element is closed for a first preset time, the compressor is closed, so that the refrigerant can be pumped from the shell tube, and the icing speed is delayed.
Further, after outputting the alert message, the method further comprises: and after the second preset time, activating a confirmation function, and when a confirmation instruction is received, continuing starting up and running of the unit.
The second preset time may be set according to the actual situation of the unit, for example, the second preset time is set to 5 minutes. The activation confirmation function may be: adding a confirmation button on the display screen; or a confirmation button on the hardware is activated, allowing the user to press; or voice confirmation is activated, allowing subsequent actions to be performed in accordance with the "confirmation instruction" entered by the user's voice.
According to the embodiment, through the confirmation function after the second preset time, the user is provided with enough time to check whether the unit lacks water or not, and the user is required to truly check the water system, which is equivalent to limiting the next starting time, so that the risk of icing in the shell tube is reduced.
In one embodiment, acquiring the intake air temperature and the intake air temperature variation value before the low-pressure protection occurrence time includes:
acquiring the air suction temperature of each moment in a third preset time before the low-voltage protection occurrence moment, and calculating the average value of the air suction temperature of each moment to be used as the air suction temperature before the low-voltage protection occurrence moment;
And obtaining the air suction temperature of each moment in a fourth preset time before the low-voltage protection occurrence moment, calculating the difference value between the air suction temperature of any moment in the fourth preset time and the air suction temperature of the last moment to obtain at least one difference value, and then calculating the average value of the at least one difference value to be used as the air suction temperature change value before the low-voltage protection occurrence moment.
The third preset time and the fourth preset time can be set according to the actual condition of the unit, and the third preset time and the fourth preset time can be equal or unequal, and preferably, the fourth preset time is greater than the third preset time. The fourth preset time is to confirm whether the variation of the suction temperature within a certain time accords with a certain rule, and the larger the value within a certain range is, the more the water temperature can be indicated to be reduced at a certain speed within the time period. The third preset time is used for confirming whether the average inhalation temperature in a certain time is lower than the target value or not, and reflecting the inhalation temperature value before the low-voltage protection hair is born more accurately. The intake air temperature at each time is preferably acquired at a predetermined time interval, and for example, the time interval may be 60 seconds, the intake air temperature is acquired at the current time, and the intake air temperature is acquired at the next time after 60 seconds (referred to as the intake air temperature at the next time). The fourth preset time comprises at least one time interval.
According to the embodiment, the average value in a certain time is calculated, so that the suction temperature and the suction temperature change condition before the low-voltage protection occurrence time can be reflected more accurately, whether the unit lacks water or not can be judged more accurately, and the anti-freezing control can be performed more timely and accurately.
The embodiment can carry out the anti-freezing judgment and control in the whole process of starting and running the unit, so that anti-freezing control measures can be timely adopted no matter when the unit is started or running. For example, before responding to the low voltage protection instruction, the method further comprises: starting the compressor in response to a start-up refrigeration instruction; detecting a low pressure when the compressor on time is less than or equal to a fifth preset time; and outputting a low-pressure protection instruction when the low-pressure is detected to be smaller than the preset pressure. The fifth preset time can be set according to the actual condition of the unit. The preset pressure can be set according to the actual condition of the unit. The embodiment can start to judge when the machine is started to refrigerate, so that the anti-freezing protection can be carried out at the first time, and the problem that the water side heat exchanger is frozen due to no water before the machine set is started is avoided.
Example two
The method of controlling the freeze protection of the unit is described below with reference to a specific embodiment, however, it should be noted that the specific embodiment is only for better illustrating the present application, and is not meant to limit the present application unduly. The same or corresponding terms as those of the above embodiments are explained, and the present embodiment will not be repeated.
As shown in fig. 2, which is a schematic diagram of a water chiller, the water chiller includes: a compressor 1, an air-cooled heat exchanger 2, an electronic expansion valve 3 and a water side heat exchanger 4. The water side heat exchanger 4 comprises a cold water inlet A and a cold water outlet B. The suction side of the compressor 1 is provided with a pressure sensor 5 for detecting suction pressure (i.e., low pressure) and a suction bulb 6 for detecting suction temperature, the suction bulb 6 being provided with a suction bulb 6. The refrigerant flow direction in the refrigeration mode is as follows: compressor 1- & gt air-cooled heat exchanger 2- & gt electronic expansion valve 3- & gt water side heat exchanger 4- & gt compressor 1.
The unit antifreezing control mechanism is as follows:
In the cooling mode, the following conditions are simultaneously satisfied:
(1) Detecting that the low pressure Pd is less than P1, and reporting the low pressure protection;
(2) The average value delta T1 of the suction temperature change values in the time T1 before the low-voltage protection occurs is less than or equal to delta T2;
(3) The average value Tp of the suction temperature is less than or equal To in the time t2 before the low-voltage protection occurs;
The following freeze protection control is performed: immediately closing the electronic expansion valve 3 of the system, closing the compressor 1 after 3 seconds, and ejecting a 'please check whether the water pump is started or not and whether the water flow of the water system is normal' in the control screen, and adding a 'confirm' button in the control screen after 5 minutes, wherein after the confirm button is manually clicked, the machine can be started up and operated continuously.
Wherein P1 corresponds To the preset pressure, to corresponds To the first preset threshold, and DeltaT 2 corresponds To the second preset threshold. t1 corresponds to the fourth preset time, and t2 corresponds to the third preset time.
Under the condition that no water exists in the shell tube, if the refrigerant is kept in the shell tube, the icing speed is increased, and at the moment, the electronic expansion valve is closed to prevent the refrigerant from flowing into the shell tube further. After the electronic expansion valve is closed for 3 seconds, the compressor is closed, so that the refrigerant can be pumped away from the shell tube, and the icing speed is delayed. By closing the electronic expansion valve 3 of the system immediately and closing the compressor 1 after 3 seconds, the refrigerant can be further prevented from continuously absorbing heat in the shell tube to further cause the aggravated frost crack.
The confirmation button is added in the control screen after 5 minutes, and after the confirmation button is manually clicked, the user can continue to start up and run, so that the user can be required to really detect the water system, and the next starting time is limited.
The parameters are described in table 1 below:
table 1 parameter setting table
The intake air temperature T may be acquired at regular intervals and an intake air temperature change value Δt, which is the difference between the intake air temperature at the present time and the intake air temperature at a time before 60 seconds, may be calculated, for example, at 60 seconds. the time T1 includes at least one of the time intervals, i.e., at least one intake air temperature variation value exists in the time T1, and an average value DeltaT 1 of each intake air temperature variation value in the time T1 is calculated. The average value of the intake temperatures in the time t2 is calculated to obtain an intake temperature average value Tp.
As shown in fig. 3, the unit antifreeze control includes the steps of:
s301, starting a compressor.
S302, judging whether the compressor on time t is less than or equal to t0, if so, entering S303, otherwise, entering S309. t0 corresponds to the fifth preset time.
S303, judging whether the following conditions are met at the same time:
(1) Detecting that the low pressure Pd is less than P1, and reporting the low pressure protection;
(2) The average value delta T1 of the suction temperature change values in the time T1 before the low-voltage protection occurs is less than or equal to delta T2;
(3) The average value Tp of the suction temperature is less than or equal To in the time t2 before the low-voltage protection occurs;
if yes, go to S304, if no, return to S302.
S304, entering an anti-freezing control mechanism.
S305, closing the electronic expansion valve.
S306, after 3 seconds, the compressor is turned off.
S307, the control screen prompts that whether the water pump is started or not and whether the water flow of the water system is normal or not is checked.
And S308, after 5 minutes, a confirmation button is added in the control screen, and after the confirmation button is manually clicked, the power-on operation can be continued, and the operation returns to S301.
S309, the unit continues to operate. In the continuous running process of the unit, if low-voltage protection occurs, the anti-freezing control can be performed by combining the air suction temperature and the air suction temperature change value, so that the anti-freezing judgment and control can be realized in the whole starting and running process of the unit.
In the engineering, the water pump supplies water to the whole water system, and the "no water flow" means that the water pump stops working (a failure or a field engineering staff cannot recognize that the water pump is not started before starting, the engineering does not link the water pump with the unit according to the specified requirement, so that the unit cannot detect that the water pump is not started before starting), and a part of water remains in the shell tube of the water side heat exchanger. The amount of water may be small, and frost cracking may occur as the amount of water is small, and the decrease in the water temperature is more severe as the amount of water is small, so that it is considered whether or not the decrease in the intake air temperature is severe when the antifreeze control is performed. For example, in the same environment, a cup of water and a barrel of water are supplied with the same amount of cold respectively for a certain period of time, and a cup of water is easier to freeze than a barrel of water, and the temperature is extremely severe and rapid.
The water and the refrigerant exchange heat in the water side heat exchanger, in the normal operation process, the water temperature can be set to a target value (such as 7 ℃), the water absorbs the cold energy of the refrigerant, the water temperature is reduced, and the refrigerant is evaporated, so that the temperature of the refrigerant at the moment is lower than the water temperature, and the suction temperature is considered in the antifreezing control.
Whether the water in the water side heat exchanger is more or less, there is finally a common feature in that low pressure protection occurs, since a low water temperature results in a low evaporation pressure (i.e. low pressure), and thus the low pressure is taken into account when performing the anti-freeze control. However, the occurrence of low pressure protection cannot be shown to be caused by water shortage, so that the antifreezing control is performed by combining the low pressure, the air suction temperature and the air suction temperature variation value together to avoid erroneous judgment.
Example III
Based on the same inventive concept, the embodiment provides a unit anti-freezing control device, which can be used for realizing the unit anti-freezing control method described in the embodiment. The apparatus may be implemented in software and/or hardware.
Fig. 4 is a block diagram of an antifreeze control device for a unit according to a third embodiment of the present invention, as shown in fig. 4, the device includes:
An acquisition module 41, configured to acquire an intake air temperature and an intake air temperature variation value before a low-voltage protection occurrence time in response to a low-voltage protection instruction;
the control module 42 is configured to execute the anti-freezing control if the suction temperature is less than or equal to a first preset threshold value and the suction temperature variation value is less than or equal to a second preset threshold value.
Optionally, the control module 42 includes:
A closing unit for closing the throttle element and the compressor;
And the output unit is used for outputting a reminding message to remind a user to check whether the water flows of the water pump and the water system are normal.
Optionally, the closing unit is specifically configured to: and immediately closing the throttling element, and closing the compressor after a first preset time.
Optionally, the control module 42 further includes:
And the control unit is used for activating the confirmation function after the second preset time after the reminding message is output, and when a confirmation instruction is received, the unit continues to start up and run.
Optionally, the obtaining module 41 is specifically configured to:
Acquiring the air suction temperature of each moment in a third preset time before the low-voltage protection occurrence moment, and calculating the average value of the air suction temperature of each moment to be used as the air suction temperature before the low-voltage protection occurrence moment;
And obtaining the suction temperature of each moment in a fourth preset time before the low-voltage protection occurrence moment, calculating the difference value between the suction temperature of any moment in the fourth preset time and the suction temperature of the last moment to obtain at least one difference value, and then calculating the average value of the at least one difference value to be used as the suction temperature change value before the low-voltage protection occurrence moment.
Optionally, the unit antifreeze control device further includes:
The detection module is used for starting the compressor in a refrigerating mode; detecting a low pressure when the compressor on time is less than or equal to a fifth preset time; and outputting the low-pressure protection instruction when the low-pressure is detected to be smaller than the preset pressure.
The device can execute the unit anti-freezing control method provided by the embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. Technical details which are not described in detail in the embodiment of the present invention can be referred to the unit anti-freezing control method provided in the embodiment of the present invention.
Example IV
The embodiment provides a water chiller, including: the unit antifreeze control device according to the above embodiment.
Example five
The present embodiment provides a computer device including: a memory, a processor and a computer program stored on the memory and executable on the processor, which processor implements the steps of the method described in the above embodiments when it executes the computer program.
The present embodiment also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method described in the above embodiments.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The unit antifreezing control method is characterized by comprising the following steps of:
Responding to the low-voltage protection instruction, and acquiring the air suction temperature and the air suction temperature change value before the low-voltage protection occurrence time;
If the suction temperature is less than or equal to a first preset threshold value and the suction temperature variation value is less than or equal to a second preset threshold value, executing anti-freezing control;
performing the freeze protection control includes: the throttling element and the compressor are closed.
2. The method of claim 1, wherein the antifreeze control is performed, further comprising:
And outputting a reminding message to remind a user to check whether the water flows of the water pump and the water system are normal.
3. The method of claim 1, wherein closing the throttling element and the compressor comprises:
And immediately closing the throttling element, and closing the compressor after a first preset time.
4. The method of claim 2, further comprising, after outputting the alert message:
And after the second preset time, activating a confirmation function, and when a confirmation instruction is received, continuing starting up and running of the unit.
5. The method of claim 1, wherein obtaining the suction temperature and the suction temperature variation value before the low pressure protection occurrence time comprises:
Acquiring the air suction temperature of each moment in a third preset time before the low-voltage protection occurrence moment, and calculating the average value of the air suction temperature of each moment to be used as the air suction temperature before the low-voltage protection occurrence moment;
And obtaining the suction temperature of each moment in a fourth preset time before the low-voltage protection occurrence moment, calculating the difference value between the suction temperature of any moment in the fourth preset time and the suction temperature of the last moment to obtain at least one difference value, and then calculating the average value of the at least one difference value to be used as the suction temperature change value before the low-voltage protection occurrence moment.
6. The method of any one of claims 1 to 5, further comprising, prior to responding to the low pressure protection command:
Starting the compressor in response to a start-up refrigeration instruction;
detecting a low pressure when the compressor on time is less than or equal to a fifth preset time;
and outputting the low-pressure protection instruction when the low-pressure is detected to be smaller than the preset pressure.
7. An antifreeze control device for a machine set, comprising:
the acquisition module is used for responding to the low-voltage protection instruction and acquiring the air suction temperature and the air suction temperature change value before the low-voltage protection occurrence moment;
The control module is used for executing anti-freezing control if the air suction temperature is smaller than or equal to a first preset threshold value and the air suction temperature change value is smaller than or equal to a second preset threshold value;
The control module includes: and a closing unit for closing the throttling element and the compressor.
8. A chiller, comprising: the unit antifreeze control device of claim 7.
9. A computer device, comprising: memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any one of claims 1 to 6 when the computer program is executed by the processor.
10. A non-transitory computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method according to any one of claims 1 to 6.
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