CN109520572A - Enthalpy difference chamber circulating air volume measuring device and initial opening method of nozzle thereof - Google Patents
Enthalpy difference chamber circulating air volume measuring device and initial opening method of nozzle thereof Download PDFInfo
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- CN109520572A CN109520572A CN201811336041.2A CN201811336041A CN109520572A CN 109520572 A CN109520572 A CN 109520572A CN 201811336041 A CN201811336041 A CN 201811336041A CN 109520572 A CN109520572 A CN 109520572A
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- nozzle
- control device
- enthalpy difference
- measuring device
- air circulation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to the technical field of air quantity detection of an air outlet device, and provides an enthalpy difference chamber circulating air quantity measuring device and an initial opening method of a nozzle of the enthalpy difference chamber circulating air quantity measuring device, wherein the enthalpy difference chamber circulating air quantity measuring device comprises a receiving chamber, an exhaust chamber, a pressure sensor, a control device and an alarm device, the receiving chamber and the exhaust chamber are communicated by adopting at least two nozzles, the pressure sensor is arranged in the receiving chamber, the control device is in communication connection with the pressure sensor, the control device is in communication connection with a switch of the nozzle, and the control device is in communication connection with the alarm device; the nozzle initial opening method of the enthalpy difference chamber circulating air volume measuring device is characterized in that an air volume value interval and a nozzle corresponding table are arranged for a control device, then a nozzle needing to be opened is selected according to the air volume value interval of the nominal air volume value of the air to be measured in the air volume value interval and the air volume value interval of the nozzle corresponding table, and finally the control device controls the selected nozzle to be opened, so that the initial opening of the nozzle is automated.
Description
Technical field
The present invention relates to the air volume test technical fields of exhaust apparatus, specifically, being to be related to a kind of enthalpy difference chamber circulated air
The initial open method of measuring device and its nozzle.
Background technique
Enthalpy difference chamber air circulation measuring device generally includes receiving chamber, exhaust air box, nozzle and exhaust blower, the outlet air of wind to be measured
Device (such as air conditioner) is connect by air hose with receiving chamber, and one or more nozzles are mounted between receiving chamber and exhaust air box
Wall surface on, from nozzle from receiving chamber to exhaust air box air draft.
According to the regulation of GB/T7725-2004, throat's wind speed of nozzle should be at 15m/s between 35m/s, receive
The static pressure of room should be adjusted to 0.In order to meet these requirements, needs to control the different of nozzle and open situation and control air draft
Machine.
However, in the prior art, the control (which nozzle specifically opened) to nozzle, often through the experience of operator
Judgement is unsuitable for general staff's operation, is unfavorable for large-scale promotion operation.
Summary of the invention
To solve the above-mentioned problems, one of the objects of the present invention is to provide it is a kind of convenient for automation control nozzle open
Enthalpy difference chamber air circulation measuring device.
To achieve the goals above, enthalpy difference chamber air circulation measuring device provided by the invention include receiving chamber, exhaust air box,
Pressure sensor and control device, the receiving chamber and the exhaust air box are connected to using at least two nozzles, the pressure sensing
Device is set in the receiving chamber, and the control device is connect with the pressure sensor communication, the control device and the spray
The Switch Communication of mouth connects.
Therefore the present invention is designed by setting to enthalpy difference chamber air circulation measuring device and structure, by adding
Control device, and control device is connect with pressure sensor communication, the Switch Communication of control device and nozzle is connected；In this way
The switch that nozzle can be controlled by control device realizes the automatic Switching of nozzle, reduces the measurement of enthalpy difference chamber air circulation
The operation difficulty of device.
One Preferable scheme is that, the enthalpy difference chamber air circulation measuring device further includes warning device, control dress
It sets and is communicated to connect with the warning device.
Therefore increase warning device for enthalpy difference chamber air circulation measuring device, and by control device and warning device
Communication connection, so that when occurring abnormal in controlling the program that nozzle is opened operator can be reminded by warning device.
Another Preferable scheme is that, the enthalpy difference chamber air circulation measuring device further includes exhaust blower, the exhaust blower
On the locular wall of the exhaust air box, the control device and the exhaust blower are communicated to connect.
Therefore communicate to connect control device and exhaust blower, make it possible to control exhaust blower by control device,
The degree of automation for further promoting enthalpy difference chamber air circulation measuring device, further decreases enthalpy difference chamber air circulation measuring device
Operation difficulty.
To solve the above-mentioned problems, the second object of the present invention, which is to provide, a kind of opens convenient for automation control nozzle
The initial open method of nozzle of enthalpy difference chamber air circulation measuring device.
To achieve the goals above, the initial opening square of nozzle of enthalpy difference chamber air circulation measuring device provided by the invention
Method, the enthalpy difference chamber air circulation measuring device include receiving chamber, exhaust air box, pressure sensor and control device, the reception
Room is connected to the exhaust air box using at least two nozzles, and the pressure sensor is set in the receiving chamber, the control dress
It sets and is connect with the pressure sensor communication, the control device is connect with the Switch Communication of the nozzle；Method includes: setting
Airflow value section table corresponding with nozzle；Input nominal air volume value: Xiang Suoshu control device inputs nominal air volume value；It inputs to be measured
Wind: wind to be measured is input to the receiving chamber；Open nozzle: the control device is in airflow value section table corresponding with nozzle
It is middle to search the corresponding airflow value section of the nominal air volume value, and open the corresponding nozzle in airflow value section.
Therefore the initial open method of nozzle of the invention, by the way that airflow value section and nozzle is arranged for control device
Table is corresponded to, then the airflow value area locating in the table corresponding with nozzle of the airflow value section according to the nominal air volume value of wind to be measured
Between, it to select the nozzle for needing to open, and is finally opened by the nozzle that control device control is chosen, keeps the initial unlatching of nozzle real
Now automate.
One Preferable scheme is that, the airflow value section table corresponding with nozzle is according to the throat section face of each nozzle
The air quantity that product size and unit area can circulate is set.
Therefore national standard GB/T7725-2004 define nozzle throat's wind speed should be at 15m/s to 35m/s it
Between, using airflow value when calculating (under original state, in the name of airflow value replacement) of wind to be measured divided by the both sides of throat's wind speed
Dividing value, can obtain circulating cross-sectional area section required for these air quantity, the nozzle or Nozzle combination that at this moment can be selected, and need
Meeting throat's cross-sectional area summation of each nozzle in the throat's cross-sectional area or Nozzle combination of nozzle, to be in this required
Cross-sectional area section in；The airflow value section set accordingly table corresponding with nozzle can satisfy national standard about throat's wind speed
Regulation, the nozzle or Nozzle combination that can satisfy this condition certainly might have it is a variety of, specifically setting airflow value section with
Nozzle can also be selected according in national standard about the requirement of static pressure and usual experience when corresponding to table, or specific
Selected as far as possible when setting corresponding with the nozzle table in airflow value section nozzle throat cross-sectional area with by throat's wind speed for 25m/s in terms of
The cross-sectional area of calculating close nozzle or Nozzle combination realize the determination to airflow value section table corresponding with nozzle.
To solve the above-mentioned problems, the third object of the present invention, which is to provide, a kind of opens convenient for automation control nozzle
The initial open method of nozzle of enthalpy difference chamber air circulation measuring device.
To achieve the goals above, the initial opening square of nozzle of enthalpy difference chamber air circulation measuring device provided by the invention
Method, the enthalpy difference chamber air circulation measuring device include receiving chamber, exhaust air box, pressure sensor, control device and warning device,
The receiving chamber is connected to the exhaust air box using at least two nozzles, and the pressure sensor is set in the receiving chamber, institute
It states control device to connect with the pressure sensor communication, the control device is connect with the Switch Communication of the nozzle, described
Control device and the warning device communicate to connect；Method includes: to set the first static pressure, setting first for the control device
Pressure difference value and setting airflow value section table corresponding with nozzle；Input nominal air volume value: Xiang Suoshu control device input name
Airflow value；It inputs wind to be measured: wind to be measured is input to the receiving chamber；Detect the real-time pressure value of receiving chamber: the pressure passes
Sensor detect the receiving chamber real-time pressure value, and send the real-time pressure value to the control device；Judgement is surveyed
Whether amount state is normal: it is poor that the control device is made using the real-time pressure value and first static pressure, is pressed in real time
Power difference；If the real-time pressure difference is less than the first pressure difference, abnormal alarm: the warning device issues police
Report；If the real-time pressure difference is not less than the set pressure differential value, normally-open nozzle: control device is in airflow value area
Between the corresponding airflow value section of nominal air volume value, and unlatching spray corresponding with the airflow value section are searched in table corresponding with nozzle
Mouth.
Therefore due to wind to be measured be likely to occur exception and enthalpy difference chamber air circulation measuring device be likely to occur it is different
Often, therefore, before the unlatching of automation control nozzle, increase and whether measuring state is normally judged, when not occurring abnormal
Nozzle is opened in the normal order, and when occurring abnormal, control device control warning device is sounded an alarm, timely convenient for operator
Discharge is abnormal, guarantees that measurement data is accurate.
One Preferable scheme is that, the airflow value section table corresponding with nozzle is according to the throat section face of each nozzle
The air quantity that product size and unit area can circulate is set.
Therefore national standard GB/T7725-2004 define nozzle throat's wind speed should be at 15m/s to 35m/s it
Between, using airflow value when calculating (under original state, in the name of airflow value replacement) of wind to be measured respectively divided by throat's wind speed
Two boundary values, the boundary value for the cross-sectional area required for these air quantity that can obtain circulating, the nozzle that at this moment can be selected or
Nozzle combination needs to meet at throat's cross-sectional area summation of each nozzle in the throat's cross-sectional area or Nozzle combination of nozzle
Between two boundary values of the required cross-sectional area；The airflow value section set accordingly table corresponding with nozzle can satisfy
Regulation of the national standard about throat's wind speed, the nozzle or Nozzle combination that can satisfy this condition certainly might have a variety of, have
Body when corresponding with the nozzle table in airflow value section is set can also according in national standard about the requirement of static pressure and usual experience
Selected, or select as far as possible in specifically setting corresponding with the nozzle table in airflow value section nozzle throat cross-sectional area and with
Throat's wind speed nozzle or Nozzle combination close for the calculated cross-sectional area of 25m/s are realized to airflow value section and spray
Mouth corresponds to the determination of table.
Another Preferable scheme is that, enthalpy difference chamber air circulation measuring device further includes exhaust blower, and exhaust blower is set to air draft
On the locular wall of room, control device and exhaust blower are communicated to connect；When opening nozzle, exhaust blower is opened.
Therefore communicate to connect control device and exhaust blower, and open exhaust blower when opening nozzle, make it possible to
Exhaust blower is controlled by control device, further promotes the degree of automation of enthalpy difference chamber air circulation measuring device, further
Reduce the operation difficulty of enthalpy difference chamber air circulation measuring device.
Further embodiment is that exhaust blower is adjustable speed fan, and control device adjusts the wind of exhaust blower according to nominal air volume value
Speed.
Therefore exhaust blower is set as adjustable speed fan, facilitate control device big according to the different air quantity of wind to be measured
The small wind speed to adjust exhaust blower, enables air draft rate to match as far as possible with the input rate of wind to be measured.
Further scheme is that exhaust blower is frequency controlling fan.
Therefore frequency controlling fan is one kind of adjustable speed fan, it can be more acurrate steady by the way of frequency control
The revolving speed of fixed adjusting exhaust blower, realizes the stepless time adjustment of exhaust blower, convenient for exhaust blower air draft rate preferably with wind to be measured
Input rate matching.
Another Preferable scheme is that, set the first interval time, have input wind to be measured and waited first interval when
Between after, then judge whether measuring state normal.
Therefore after wind to be measured is blown into receiving chamber, the pressure of receiving chamber can be increased, and pressure sensor, which detects, to be connect
The pressure rise for receiving room shows that measuring state is normal, however, the pressure of receiving chamber can be in air-flow when wind to be measured has just inputted receiving chamber
It plays pendulum under disturbance, the real-time pressure that can be conducive to receiving chamber after a period of time after having input wind to be measured tends to
Stablize, stablize real-time pressure value size detected by pressure sensor, therefore, setting is having input wind to be measured and waiting
Judge whether measuring state is normal after first interval time again, it is more accurate to facilitate deciding in this way.
Detailed description of the invention
Fig. 1 is the schematic diagram of enthalpy difference chamber air circulation measuring device of the present invention；
Fig. 2 is the flow chart one of the initial open method embodiment of nozzle of enthalpy difference chamber air circulation measuring device of the present invention；
Fig. 3 is the flowchart 2 of the initial open method embodiment of nozzle of enthalpy difference chamber air circulation measuring device of the present invention；
Fig. 4 is the flow chart 3 of the initial open method embodiment of nozzle of enthalpy difference chamber air circulation measuring device of the present invention；
Fig. 5 is the flow chart four of the initial open method embodiment of nozzle of enthalpy difference chamber air circulation measuring device of the present invention.
Specific embodiment
Enthalpy difference chamber air circulation measuring device embodiment:
Please refer to Fig. 1, enthalpy difference chamber air circulation measuring device provided in this embodiment, including receiving chamber 1, exhaust air box 2, pressure
Force snesor 3, exhaust blower 4, control device (not shown) and warning device (not shown), receiving chamber 1 and exhaust air box 2
Between using at least two nozzles 5 be connected to, it is preferred that the throat diameter of multiple nozzles 5 is not identical, pressure sensor 3 be set to connect
It receives in room 1, control device and pressure sensor 3 communicate to connect, and control device is connect with the Switch Communication of nozzle 5, control device
It is communicated to connect with warning device, exhaust blower 4 is set on the locular wall of exhaust air box 2, and control device and exhaust blower 4 communicate to connect.
It is communicated to connect by adding control device and warning device, and by control device and pressure sensor 3, control is filled
It sets and is connect with the Switch Communication of nozzle 5, and control device and warning device are communicated to connect；Control device can be passed through in this way
To control the opening and closing of nozzle 5, the automatic Switching of realization nozzle 5, the behaviour of reduction enthalpy difference chamber air circulation measuring device
Make difficulty.
Control device and exhaust blower 4 are communicated to connect, make it possible to control exhaust blower 4 by control device, further
The degree of automation for promoting enthalpy difference chamber air circulation measuring device, further decreases the operation of enthalpy difference chamber air circulation measuring device
Difficulty.
The initial open method embodiment one of the nozzle of enthalpy difference chamber air circulation measuring device:
The initial open method of nozzle of enthalpy difference chamber air circulation measuring device provided in this embodiment, enthalpy difference chamber air circulation
Measuring device includes receiving chamber 1, exhaust air box 2, pressure sensor 3 and control device, and receiving chamber 1 and exhaust air box 2 use at least two
A nozzle 5 is connected to, and pressure sensor 3 is set in receiving chamber 1, and control device and pressure sensor 3 communicate to connect, control device with
The Switch Communication of nozzle 5 connects；Method includes: setting airflow value section table corresponding with nozzle；Input nameplate airflow value: to control
Device inputs nameplate airflow value；It inputs wind to be measured: wind to be measured is input to receiving chamber 1；Open nozzle 5: control device is according to wind
Magnitude section table corresponding with nozzle opens the nozzle 5 in airflow value section locating for nameplate airflow value.
By the way that airflow value section table corresponding with nozzle is arranged for control device, then existed according to the nameplate airflow value of wind to be measured
Locating airflow value section in the table corresponding with nozzle of the airflow value section, to select one or more nozzle 5 for needing to open,
And finally opened by the nozzle 5 that control device control is chosen, so that the initial unlatching of nozzle 5 is realized automation.
Airflow value section table corresponding with nozzle is according to the throat section size and unit of each nozzle 5 in the present embodiment
The air quantity that area can circulate is determined.Throat's wind speed that national standard GB/T7725-2004 defines nozzle 5 should be at
15m/s between 35m/s, use the airflow value while calculating (original state with the replacement of nameplate airflow value) of wind to be measured divided by the throat
Two boundary values of wind speed, can obtain circulating cross-sectional area section required for these air quantity, the nozzle 5 that at this moment can be selected or
Nozzle 5 combines, and the throat's cross-sectional area for needing to meet each nozzle 5 in the throat's cross-sectional area or the combination of nozzle 5 of nozzle 5 is total
With in the required cross-sectional area section；The airflow value section set accordingly table corresponding with nozzle can satisfy national standard
In regulation about throat's wind speed, the nozzle 5 or the combination of nozzle 5 that can satisfy this condition certainly might have a variety of, have
Body when corresponding with the nozzle table in airflow value section is set can also according in national standard about the requirement of static pressure and usual experience
Selected, or select as far as possible in specifically setting corresponding with the nozzle table in airflow value section 5 throat's cross-sectional area of nozzle and
It is combined, is realized to airflow value section with throat's wind speed nozzle 5 close for the calculated cross-sectional area of 25m/s or nozzle 5
The determination of table corresponding with nozzle.Such as the corresponding air quantity range of nozzle that throat diameter is φ 70mm is (280 ~ 460) m3/ h,
Throat diameter is that the corresponding air quantity range of 80 nozzle of φ 5 is (360~600) m3/h。
About nameplate airflow value, it is the nominal air volume value of air conditioner 6 to be measured, inevitably has error in production process, therefore
There may be differences for the airflow value for the wind to be measured for causing the nameplate airflow value and air conditioner 6 actually to blow out；Wind to be measured is not being measured
Actual air volume value before, the unlatching situation of nozzle 5 and exhaust blower 4 is determined using nameplate airflow value；It can certainly use
Other nominal air volume values in addition to nameplate airflow value, such as with the airflow value of batch exhaust apparatus other products, as control
The condition that nozzle processed is opened.
What so-called air quantity indicated is the flow of unit time in the present embodiment, when what so-called airflow value indicated is unit
Between flow number, nominally such as nameplate airflow value indicate the air quantity volume that tested ventilation device can be blown out in the unit time
Value.
The initial open method embodiment two of the nozzle of enthalpy difference chamber air circulation measuring device:
Please refer to Fig. 1 to Fig. 4, the initial opening square of nozzle of enthalpy difference chamber air circulation measuring device provided in this embodiment
Method, enthalpy difference chamber air circulation measuring device include receiving chamber 1, exhaust air box 2, pressure sensor 3, exhaust blower 4, control device and report
Alarm device, receiving chamber 1 and exhaust air box 2 are connected to using two nozzles 5, and the throat diameter of a nozzle 5 is φ 70mm, another spray
The throat diameter of mouth 5 is φ 80mm, and pressure sensor 3 is set in receiving chamber 1, and exhaust blower 4 is set on the locular wall of exhaust air box 2, control
Device processed and pressure sensor 3 communicate to connect, and control device is connect with the Switch Communication of nozzle 5, control device and warning device
Communication connection, control device and exhaust blower 4 communicate to connect；The first static pressure=0Pa, setting first pressure are set for control device
Difference=5Pa, setting the first interval time=30s and setting airflow value section table as shown in the table corresponding with nozzle
Under original state: two nozzles 5 are in closed state, and exhaust blower 4 is in close state, the static pressure of receiving chamber 1
It is adjusted to the first static pressure.
Referring to figure 2., the initial open method of automation control nozzle is as follows:
Firstly, executing step S1, wind to be measured is inputted: being 500m by nameplate air quantity3The air outlet of the air conditioner 6 of/h passes through pipe
Road 7 is connected to receiving chamber 1, and wind to be measured is input to receiving chamber 1 after opening air conditioner 6；
Then, step S2 is executed, inputs nameplate airflow value to control device, such as defeated to control device by input equipment
Enter nameplate airflow value=500m of wind to be measured3/h；
Then, execute step S3, detect the real-time pressure value of receiving chamber: pressure sensor 3 detect receiving chamber 1 it is real-time
Pressure value, and send real-time pressure value to control device；
Step S4 is executed, the first interval time 30s is waited；
Execute step S5, judge whether measuring state is normal: control device is made using real-time pressure value and the first static pressure
Difference obtains real-time pressure difference, if real-time pressure difference is less than first pressure difference, S6 is thened follow the steps, if real-time pressure is poor
Value is not less than set pressure differential value, thens follow the steps S7；
Step S6, abnormal alarm: warning device sounds an alarm；
Step S7, normally-open nozzle: control device searches the nameplate air quantity in the table corresponding with nozzle of airflow value section
Value 500m3The corresponding airflow value section /h, and nozzle 5 corresponding with the airflow value section is opened, namely open throat diameter and be
The nozzle of φ 80mm, while opening exhaust blower 4.
It should be noted that the present invention does not limit the execution opportunity of step S2, there are many execution opportunity of step S2, only
It needs to execute before executing step S7.Such as step S2 executes (as shown in Figure 3) before executing S1 step, Huo Zhebu
Rapid S2 executes (as shown in Figure 4) after performing step S3 but before executing step S4 or step S2 is being performed
(as shown in Figure 5) is executed after step S5 but before executing step S7, it might even be possible to a certain step and step S2 before being S7
It carries out simultaneously.
Airflow value section table corresponding with nozzle
Since wind to be measured is likely to occur exception and enthalpy difference chamber air circulation measuring device is likely to occur exception,
Before automation control nozzle 5 is opened, increases and whether measuring state is normally judged, in the normal order when not occurring exception
Nozzle 5 is opened, when occurring abnormal, control device control warning device is sounded an alarm, exception is discharged in time convenient for operator,
Guarantee that measurement data is accurate.
In above data, the first static pressure complements each other with first pressure difference, and arbitrarily changing one of them just can change
The expression formula of the whether normal Rule of judgment of measuring state, " nameplate airflow value the-the first static pressure > first pressure difference " can also
To be deformed into " the first static pressure of nameplate airflow value >+first pressure difference ", due to " the first static pressure+first pressure difference "
Setting is to determine whether measuring state is normal, and different air quantity to be measured can result in the change of 1 pressure of receiving chamber for subsequent step
Change difference, therefore the determination of " the first static pressure+first pressure difference " can voluntarily be adjusted according to measurement request.
It about nozzle quantity and diameter, is specifically determined after having selected specific enthalpy difference chamber air circulation measuring device
, the airflow value to be measured of exhaust apparatus blowout should selected enthalpy difference chamber air circulation measuring device air measuring range it
It is interior, after having selected enthalpy difference chamber air circulation measuring device, initially opened according to the nozzle of enthalpy difference chamber air circulation measuring device
Mode in embodiment of the method one sets airflow value section table corresponding with nozzle.
About nameplate airflow value, it is the nominal air volume value of air conditioner 6 to be measured, inevitably has error in production process, it may
There may be differences for the airflow value for the wind to be measured for causing the nameplate airflow value and air conditioner 6 actually to blow out；Wind to be measured is not being measured
Actual air volume value before, the unlatching situation of nozzle 5 and exhaust blower 4 is determined using nameplate airflow value.
About the first interval time, the setting of the first interval time is judged again after stablizing for the pressure of equal receiving chambers 1
Whether measuring state is normal, reduces misjudgment rate, therefore the specific value of the first interval time also can according to need voluntarily
Setting；It set for the first interval time, after having input wind to be measured and waiting for the first interval time, then whether judges measuring state
Normally.After wind to be measured is blown into receiving chamber 1, the pressure of receiving chamber 1 can be increased, and pressure sensor 3 detects the pressure of receiving chamber 1
Power raising shows that measuring state is normal, however, the pressure of receiving chamber 1 can be under flow perturbation when wind to be measured has just inputted receiving chamber 1
It playing pendulum, the real-time pressure that can be conducive to receiving chamber 1 after a period of time after having input wind to be measured tends towards stability,
Stablize real-time pressure value size detected by pressure sensor 3, therefore, setting is having input wind to be measured and waiting first
Judge whether measuring state is normal after interval time again, it is more accurate to facilitate deciding in this way.
Certainly, the airflow value of wind to be measured needs in the measurement range of enthalpy difference chamber air circulation measuring device namely to be measured
The airflow value of wind should be in a certain airflow value section in the table corresponding with nozzle of airflow value section, in this way can be according to the wind
The unlatching of magnitude section table automation control nozzle corresponding with nozzle.
At the beginning of nozzle of the set-up mode with enthalpy difference chamber air circulation measuring device about airflow value section table corresponding with nozzle
Beginning open method embodiment one, does not repeat here.Certainly in the specific implementation, corresponding enthalpy difference chamber circulated air measurement is being determined
It measures in device after the diameter of 5 quantity of nozzle and each nozzle 5, first formulation airflow value section table corresponding with nozzle, then exists again
It is realized according to the method for the technical program to oneself of nozzle 5 and exhaust blower 4 on the basis of the table corresponding with nozzle of the airflow value section
Dynamic melt is opened.
Control device and exhaust blower 4 are communicated to connect, and open exhaust blower 4 when opening nozzle 5, makes it possible to pass through control
Device processed controls exhaust blower 4, further promotes the degree of automation of enthalpy difference chamber air circulation measuring device, further decreases enthalpy
The operation difficulty of poor room air circulation measuring device.
Preferably, exhaust blower 4 is adjustable speed fan, and control device adjusts the wind speed of exhaust blower 4 according to nameplate airflow value.It will row
Blower 4 is set as adjustable speed fan, facilitates control device that can adjust the wind of exhaust blower 4 according to the different air forces of wind to be measured
Speed enables air draft rate to match as far as possible with the input rate of wind to be measured.It is highly preferred that exhaust blower 4 is frequency control wind
Machine.Frequency controlling fan is one kind of adjustable speed fan, being capable of more acurrate stable adjusting exhaust blower 4 by the way of frequency control
Revolving speed, the stepless time adjustment of exhaust blower 4 is realized, convenient for input rate of the air draft rate preferably with wind to be measured of exhaust blower 4
Match.
What so-called air quantity indicated is the flow of unit time in the present embodiment, when what so-called airflow value indicated is unit
Between flow number, nominally such as nameplate airflow value indicate the air quantity volume that tested ventilation device can be blown out in the unit time
Value.
Finally it is emphasized that the above description is only a preferred embodiment of the present invention, it is not intended to restrict the invention, it is right
For those skilled in the art, the present invention can have various change and change, all within the spirits and principles of the present invention,
Any modification, equivalent substitution, improvement and etc. done, should all be included in the protection scope of the present invention.
Claims (11)
1. enthalpy difference chamber air circulation measuring device, including receiving chamber, exhaust air box, pressure sensor and control device, the reception
Room is connected to the exhaust air box using at least two nozzles, and the pressure sensor is set in the receiving chamber, the control dress
It sets and is connect with the pressure sensor communication, the control device is connect with the Switch Communication of the nozzle.
2. enthalpy difference chamber air circulation measuring device according to claim 1, it is characterised in that:
The enthalpy difference chamber air circulation measuring device further includes warning device, the control device and the warning device communication link
It connects.
3. enthalpy difference chamber air circulation measuring device according to claim 1 or 2, it is characterised in that:
The enthalpy difference chamber air circulation measuring device further includes exhaust blower, and the exhaust blower is set on the locular wall of the exhaust air box,
The control device and the exhaust blower communicate to connect.
4. the initial open method of nozzle of enthalpy difference chamber air circulation measuring device, the enthalpy difference chamber air circulation measuring device include
Receiving chamber, exhaust air box, pressure sensor and control device, the receiving chamber and the exhaust air box are connected using at least two nozzles
Logical, the pressure sensor is set in the receiving chamber, and the control device is connect with the pressure sensor communication, the control
Device processed is connect with the Switch Communication of the nozzle；
Method includes:
Set airflow value section table corresponding with nozzle；
Input nominal air volume value: Xiang Suoshu control device inputs nominal air volume value；
It inputs wind to be measured: wind to be measured is input to the receiving chamber；
Open nozzle: it is corresponding that the control device searches the nominal air volume value in the table corresponding with nozzle of the airflow value section
Airflow value section, and open corresponding with the airflow value section nozzle.
5. the initial open method of nozzle of enthalpy difference chamber air circulation measuring device according to claim 4, it is characterised in that:
The airflow value section table corresponding with nozzle is according to the throat section size and unit area energy of each nozzle
The air quantity enough to circulate is set.
6. the initial open method of nozzle of enthalpy difference chamber air circulation measuring device, the enthalpy difference chamber air circulation measuring device include
Receiving chamber, exhaust air box, pressure sensor, control device and warning device, the receiving chamber and the exhaust air box use at least two
A nozzle connection, the pressure sensor are set in the receiving chamber, and the control device and the pressure sensor communication connect
It connects, the control device is connect with the Switch Communication of the nozzle, and the control device and the warning device communicate to connect；
Method includes:
It is corresponding with nozzle that the first static pressure, setting first pressure difference and setting airflow value section are set for the control device
Table；
Input nominal air volume value: Xiang Suoshu control device inputs nominal air volume value；
It inputs wind to be measured: wind to be measured is input to the receiving chamber；
Detect the real-time pressure value of receiving chamber: the pressure sensor detect the receiving chamber real-time pressure value, and by institute
It states real-time pressure value and sends the control device to；
Judge whether measuring state is normal: it is poor that the control device is made using the real-time pressure value and first static pressure,
Obtain real-time pressure difference；If the real-time pressure difference is less than the first pressure difference, following abnormal reports is jumped to
Alert step；If the real-time pressure difference is not less than the set pressure differential value, following normally-open nozzle steps is jumped to
Suddenly；
Abnormal alarm: the warning device sounds an alarm；
Normally-open nozzle: the control device searches the nominal air volume value in the table corresponding with nozzle of the airflow value section
Corresponding airflow value section, and open the nozzle corresponding with the airflow value section.
7. the initial open method of nozzle of enthalpy difference chamber air circulation measuring device according to claim 6, it is characterised in that:
The airflow value section table corresponding with nozzle is according to the throat section size and unit area energy of each nozzle
The air quantity enough to circulate is set.
8. the initial open method of nozzle of enthalpy difference chamber air circulation measuring device according to claim 6, it is characterised in that:
The enthalpy difference chamber air circulation measuring device further includes exhaust blower, and the exhaust blower is set on the locular wall of the exhaust air box,
The control device and the exhaust blower communicate to connect；
When opening the nozzle, the exhaust blower is opened.
9. the initial open method of nozzle of enthalpy difference chamber air circulation measuring device according to claim 8, it is characterised in that:
The exhaust blower is adjustable speed fan, and the control device adjusts the wind speed of the exhaust blower according to the nominal air volume value.
10. the initial open method of nozzle of enthalpy difference chamber air circulation measuring device according to claim 9, feature exist
In:
The exhaust blower is frequency controlling fan.
11. according to the initial open method of nozzle of the described in any item enthalpy difference chamber air circulation measuring devices of claim 6 to 10,
It is characterized by:
It set for the first interval time, after having input the wind to be measured and having waited first interval time, then judges to measure
Whether state is normal.
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