CN109520572B - 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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- CN109520572B CN109520572B CN201811336041.2A CN201811336041A CN109520572B CN 109520572 B CN109520572 B CN 109520572B CN 201811336041 A CN201811336041 A CN 201811336041A CN 109520572 B CN109520572 B CN 109520572B
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- 230000002159 abnormal effect Effects 0.000 claims description 7
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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
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 invention relates to the technical field of air quantity detection of an air outlet device, in particular to 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.
Background
An enthalpy difference chamber circulation air volume measuring apparatus generally includes a receiving chamber, an exhaust chamber, a nozzle, and an exhaust fan, an air outlet device (e.g., an air conditioner) to be measured is connected to the receiving chamber through an air duct, one or more nozzles are installed on a wall surface between the receiving chamber and the exhaust chamber, and the nozzle exhausts air from the receiving chamber to the exhaust chamber.
According to the regulations of GB/T7725-2004, the throat wind speed of the nozzle should be between 15m/s and 35m/s, and the static pressure value of the receiving chamber should be adjusted to 0. To meet these requirements, it is necessary to control the various opening conditions of the nozzles and to control the exhaust fan.
However, in the prior art, the control of the nozzles (i.e. which nozzles are specifically opened) is often determined by the experience of the operator, and is not suitable for general workers to operate, which is not favorable for large-scale popularization.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide an enthalpy difference chamber circulation air volume measuring device which facilitates automatic control of opening of a nozzle.
In order to achieve the purpose, the enthalpy difference chamber circulating air volume measuring device provided by the invention comprises a receiving chamber, an exhaust chamber, a pressure sensor and a control device, wherein the receiving chamber is communicated with the exhaust chamber through at least two nozzles, the pressure sensor is arranged in the receiving chamber, the control device is in communication connection with the pressure sensor, and the control device is in communication connection with switches of the nozzles.
According to the enthalpy difference chamber circulating air volume measuring device, the control device is additionally arranged and is in communication connection with the pressure sensor, and the control device is in communication connection with the switch of the nozzle through the arrangement and the structural design of the enthalpy difference chamber circulating air volume measuring device; therefore, the opening and closing of the nozzle can be controlled through the control device, the automatic opening and closing of the nozzle is realized, and the operation difficulty of the enthalpy difference chamber circulating air volume measuring device is reduced.
Preferably, the enthalpy difference chamber circulating air volume measuring device further comprises an alarm device, and the control device is in communication connection with the alarm device.
Therefore, the enthalpy difference chamber circulating air volume measuring device is additionally provided with the alarm device, and the control device is in communication connection with the alarm device, so that an operator can be reminded through the alarm device when abnormality occurs in a program for controlling the opening of the nozzle.
Another preferred scheme is that, enthalpy difference room circulation air volume measuring device still includes the exhaust fan, the exhaust fan is located on the locular wall of exhaust chamber, controlling means with exhaust fan communication connection.
Therefore, the control device is in communication connection with the exhaust fan, so that the exhaust fan can be controlled through the control device, the automation degree of the enthalpy difference chamber circulating air volume measuring device is further improved, and the operation difficulty of the enthalpy difference chamber circulating air volume measuring device is further reduced.
In order to solve the above problems, another object of the present invention is to provide a nozzle initial opening method of an enthalpy difference chamber circulation air volume measuring device which facilitates automatic control of nozzle opening.
In order to achieve the above object, the present invention provides a nozzle initial opening method of an enthalpy difference chamber circulating air volume measuring device, the enthalpy difference chamber circulating air volume measuring device includes a receiving chamber, an exhaust chamber, a pressure sensor and a control device, the receiving chamber and the exhaust chamber are communicated by at least two nozzles, the pressure sensor is disposed in the receiving chamber, the control device is in communication connection with the pressure sensor, and the control device is in communication connection with a switch of the nozzle; the method comprises the following steps: setting an air quantity value interval and a nozzle corresponding table; inputting a nominal air quantity value: inputting a nominal air volume value to the control device; inputting wind to be measured: inputting wind to be measured into the receiving chamber; opening a nozzle: and the control device searches an air volume value interval corresponding to the nominal air volume value in the air volume value interval and nozzle corresponding table and opens the nozzle corresponding to the air volume value interval.
Therefore, according to the nozzle initial opening method, the air volume value interval and the nozzle corresponding table are set for the control device, then the nozzle needing to be opened is selected according to the air volume value interval of the nominal air volume value of the wind 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 opening of the selected nozzle, so that the initial opening of the nozzle is automated.
Preferably, the air volume value interval and nozzle correspondence table is set in accordance with the size of the throat cross-sectional area of each nozzle and the air volume that can flow per unit area.
From the above, the national standard GB/T7725-2004 stipulates that the throat wind speed of the nozzle should be between 15m/s and 35m/s, and the cross-sectional area interval required for circulating the wind volume can be obtained by dividing the wind volume value of the wind to be measured (in the initial state, replaced with the nominal wind volume value in calculation) by the two boundary values of the throat wind speed, and at this time, the nozzle or nozzle combination that can be selected needs to satisfy that the throat cross-sectional area of the nozzle or the sum of the throat cross-sectional areas of the nozzles in the nozzle combination is within the required cross-sectional area interval; the set air volume value interval and the nozzle corresponding table can meet the requirements of the national standard on the throat air speed, of course, various nozzles or nozzle combinations can meet the requirements, in the specific setting of the air volume value interval and the nozzle corresponding table, of static pressure values in the national standard and common experience can be selected, or nozzles or nozzle combinations with the throat cross section area close to the cross section area calculated with the throat air speed of 25m/s can be selected as much as possible in the specific setting of the air volume value interval and the nozzle corresponding table, so that the air volume value interval and the nozzle corresponding table can be determined.
In order to solve the above problems, it is another object of the present invention to provide an initial nozzle opening method of an enthalpy difference chamber circulation air volume measuring device, which facilitates automatic control of nozzle opening.
In order to achieve the above object, the present invention provides a nozzle initial opening method for an enthalpy difference chamber circulating air volume measuring device, where the enthalpy difference chamber circulating air volume measuring device includes a receiving chamber, an exhaust chamber, a pressure sensor, a control device and an alarm device, where the receiving chamber and the exhaust chamber are communicated by at least two nozzles, the pressure sensor is disposed 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 method comprises the following steps: setting a first static pressure value, a first pressure difference value and a set air volume value interval and nozzle corresponding table for the control device; inputting a nominal air quantity value: inputting a nominal air volume value to the control device; inputting wind to be measured: inputting wind to be measured into the receiving chamber; detecting a real-time pressure value of the receiving chamber: the pressure sensor detects a real-time pressure value of the receiving chamber and transmits the real-time pressure value to the control device; judging whether the measurement state is normal: the control device adopts the difference between the real-time pressure value and the first static pressure value to obtain a real-time pressure difference value; if the real-time pressure difference value is smaller than the first pressure difference value, an abnormal alarm is given: the alarm device gives an alarm; if the real-time pressure difference is not less than the set pressure difference, normally opening the nozzle: and the control device searches an air volume value interval corresponding to the nominal air volume value in the air volume value interval and nozzle corresponding table and opens the nozzle corresponding to the air volume value interval.
Therefore, due to the fact that the wind to be measured is possibly abnormal and the enthalpy difference chamber circulating air volume measuring device is possibly abnormal, before the automatic control nozzle is opened, judgment on whether the measuring state is normal or not is added, the nozzle is opened according to a normal sequence when the abnormality does not occur, the alarm device is controlled by the control device to give an alarm when the abnormality occurs, operators can conveniently discharge the abnormality in time, and the accuracy of measured data is guaranteed.
Preferably, the air volume value interval and nozzle correspondence table is set in accordance with the size of the throat cross-sectional area of each nozzle and the air volume that can flow per unit area.
From the above, the national standard GB/T7725-2004 stipulates that the throat wind speed of the nozzle should be between 15m/s and 35m/s, and the boundary values of the cross-sectional area required for circulating the wind volume can be obtained by dividing the wind volume value of the wind to be measured (in the initial state, replacing with the nominal wind volume value in calculation) by the two boundary values of the throat wind speed, and at this time, the selectable nozzle or nozzle combination needs to satisfy that the throat cross-sectional area of the nozzle or the sum of the throat cross-sectional areas of the nozzles in the nozzle combination is between the two boundary values of the required cross-sectional area; the set air volume value interval and the nozzle corresponding table can meet the requirements of the national standard on the throat air speed, of course, various nozzles or nozzle combinations can meet the requirements, in the specific setting of the air volume value interval and the nozzle corresponding table, of static pressure values in the national standard and common experience can be selected, or nozzles or nozzle combinations with the throat cross section area close to the cross section area calculated with the throat air speed of 25m/s can be selected as much as possible in the specific setting of the air volume value interval and the nozzle corresponding table, so that the air volume value interval and the nozzle corresponding table can be determined.
Another preferred scheme is that the enthalpy difference chamber circulating air volume measuring device further comprises an exhaust fan, the exhaust fan is arranged on the chamber wall of the exhaust chamber, and the control device is in communication connection with the exhaust fan; when the nozzle is opened, the exhaust fan is started.
It is thus clear that with controlling means and exhaust fan communication connection to open the exhaust fan when opening the nozzle, make and control the exhaust fan through controlling means, further promote enthalpy difference room circulation air volume measuring device's degree of automation, further reduce enthalpy difference room circulation air volume measuring device's the operation degree of difficulty.
The further scheme is that the exhaust fan is a speed-regulating fan, and the control device regulates the air speed of the exhaust fan according to the nominal air volume value.
Therefore, the exhaust fan is set as the speed-regulating fan, so that the control device can conveniently regulate the air speed of the exhaust fan according to different air volume of the wind to be measured, and the air exhaust speed can be matched with the input speed of the wind to be measured as far as possible.
In a further scheme, the exhaust fan is a variable-frequency speed-regulating fan.
Therefore, the variable-frequency speed-regulating fan is one of the speed-regulating fans, the rotating speed of the exhaust fan can be regulated more accurately and stably by adopting a variable-frequency speed-regulating mode, stepless speed regulation of the exhaust fan is realized, and the exhaust speed of the exhaust fan is conveniently matched with the input speed of the wind to be measured better.
Still another preferable scheme is that a first interval time is set, and after the wind to be measured is input and the first interval time is waited, whether the measurement state is normal or not is judged.
It can be seen from above that, after the wind that awaits measuring blows into the receiving chamber, the pressure of receiving chamber can rise thereupon, pressure sensor detects the pressure rise of receiving chamber and shows that the measuring condition is normal, however, when the wind that awaits measuring just inputs the receiving chamber, the pressure of receiving chamber can be in unstable state under the air current disturbance, can be favorable to the real-time pressure of receiving chamber to tend towards stably after having input a period of wind that awaits measuring after, the real-time pressure value size that makes pressure sensor detect is stable, therefore, the setting is being favorable to judging again after having input the wind that awaits measuring and having waited first interval whether normal measuring condition, be favorable to judging like this more accurately.
Drawings
Figure 1 is a schematic view of an enthalpy difference chamber circulating air volume measuring device according to the present invention;
figure 2 is a first flow chart of an embodiment of the method for initially opening the nozzle of the enthalpy difference chamber circulation air volume measuring device according to the present invention;
figure 3 is a second flow chart of an embodiment of the method for initially opening the nozzle of the enthalpy difference chamber circulation air volume measuring device according to the present invention;
fig. 4 is a flow chart showing a third example of the method for initially opening the nozzle of the enthalpy difference chamber circulation air volume measuring device according to the present invention;
figure 5 is a flow chart of a fourth embodiment of the method for initially opening the nozzle of the enthalpy difference chamber circulation air volume measuring device according to the present invention.
Detailed Description
Enthalpy difference room circulation air volume measuring device embodiment:
referring to fig. 1, the enthalpy difference chamber circulating air volume measuring device provided in this embodiment includes a receiving chamber 1, an exhaust chamber 2, a pressure sensor 3, an exhaust fan 4, a control device (not shown in the figure) and an alarm device (not shown in the figure), the receiving chamber 1 and the exhaust chamber 2 are communicated by at least two nozzles 5, preferably, diameters of throats of the nozzles 5 are different, the pressure sensor 3 is disposed in the receiving chamber 1, the control device is in communication connection with the pressure sensor 3, the control device is in communication connection with switches of the nozzles 5, the control device is in communication connection with the alarm device, the exhaust fan 4 is disposed on a chamber wall of the exhaust chamber 2, and the control device is in communication connection with the exhaust fan 4.
By additionally arranging a control device and an alarm device, the control device is in communication connection with the pressure sensor 3, the control device is in communication connection with a switch of the nozzle 5, and the control device is in communication connection with the alarm device; thus, the opening and closing of the nozzle 5 can be controlled by the control device, the automatic opening and closing of the nozzle 5 is realized, and the operation difficulty of the enthalpy difference chamber circulating air volume measuring device is reduced.
With controlling means and exhaust fan 4 communication connection for can control exhaust fan 4 through controlling means, further promote enthalpy difference room circulation air volume measuring device's degree of automation, further reduce enthalpy difference room circulation air volume measuring device's the operation degree of difficulty.
First embodiment of a nozzle initial opening method of an enthalpy difference chamber circulation air volume measuring device:
the nozzle initial opening method of the enthalpy difference chamber circulating air volume measuring device provided by the embodiment comprises a receiving chamber 1, an exhaust chamber 2, a pressure sensor 3 and a control device, wherein the receiving chamber 1 and the exhaust chamber 2 are communicated by adopting at least two nozzles 5, the pressure sensor 3 is arranged in the receiving chamber 1, the control device is in communication connection with the pressure sensor 3, and the control device is in communication connection with switches of the nozzles 5; the method comprises the following steps: setting an air quantity value interval and a nozzle corresponding table; inputting a nameplate air quantity value: inputting a nameplate air quantity value to a control device; inputting wind to be measured: inputting wind to be measured into a receiving chamber 1; opening the nozzle 5: and the control device opens the nozzle 5 in the air volume value interval where the nameplate air volume value is located according to the air volume value interval and the nozzle corresponding table.
One or more nozzles 5 needing to be opened are selected by setting an air quantity value interval and a nozzle corresponding table for the control device, then according to the air quantity value interval of the nameplate air quantity value of the wind to be measured in the air quantity value interval and the air quantity value interval in the nozzle corresponding table, and finally the control device controls the selected nozzles 5 to be opened, so that the initial opening of the nozzles 5 is automated.
In the present embodiment, the air flow value interval and nozzle correspondence table is determined based on the size of the throat cross-sectional area of each nozzle 5 and the amount of air that can flow per unit area. The national standard GB/T7725-2004 stipulates that the throat wind speed of the nozzle 5 should be between 15m/s and 35m/s, and a cross-sectional area interval required for circulating wind volume can be obtained by dividing the wind volume value of the wind to be measured (replaced by a nameplate wind volume value in the initial state calculation) by two boundary values of the throat wind speed, wherein the selectable nozzle 5 or nozzle 5 combination needs to meet the requirement that the sum of the throat cross-sectional areas of the nozzles 5 or the throat cross-sectional areas of all the nozzles 5 in the nozzle 5 combination is within the required cross-sectional area interval; the set wind volume interval corresponds to the nozzleThe table can satisfy the regulation of the throat wind speed in the national standard, of course, the nozzles 5 or nozzle 5 combinations which can satisfy the condition may be various, when the wind quantity value interval and the nozzle corresponding table are specifically set, the selection can be carried out according to the requirement of the national standard on the static pressure value and the experience in the past, or when the wind quantity value interval and the nozzle corresponding table are specifically set, the nozzle 5 or nozzle 5 combination which has the throat cross section area of the nozzle 5 close to the cross section area calculated by the throat wind speed of 25m/s is selected as much as possible, so that the determination of the wind quantity value interval and the nozzle corresponding table is realized. For example, the air volume range corresponding to the nozzle with the throat diameter of phi 70mm is (280-460) m3The throat diameter is phi 80, and the corresponding air volume range of the nozzle 5 is (360-600) m3/h。
Regarding the nameplate air volume value, the nameplate air volume value is the nominal air volume value of the air conditioner 6 to be measured, and errors are inevitable in the production process, so that the nameplate air volume value and the air volume value of the air to be measured actually blown out by the air conditioner 6 may have differences; before the actual air volume value of the wind to be measured is not measured, the opening conditions of the nozzle 5 and the exhaust fan 4 are determined by adopting the nameplate air volume value; of course, other nominal air volume values besides the nameplate air volume value, such as the air volume values of other products of the same batch of air outlet devices, can be used as the conditions for controlling the opening of the nozzles.
In the present embodiment, the air volume indicates a flow rate per unit time, the air volume indicates a flow rate value per unit time, and for example, the nameplate air volume indicates a volume value of an air volume which can be nominally blown out by the measured ventilator per unit time.
The enthalpy difference chamber circulation air volume measuring device comprises a nozzle initial opening method in the embodiment II:
referring to fig. 1 to 4, the nozzle initial opening method of the enthalpy difference chamber circulation air volume measuring device provided in this embodiment includes a receiving chamber 1, an exhaust chamber 2, a pressure sensor 3, an exhaust fan 4, a control device and an alarm device, the receiving chamber 1 and the exhaust chamber 2 are communicated by two nozzles 5, the diameter of the throat of one nozzle 5 is phi 70mm, the diameter of the throat of the other nozzle 5 is phi 80mm, the pressure sensor 3 is disposed in the receiving chamber 1, the exhaust fan 4 is disposed on the chamber wall of the exhaust chamber 2, the control device is in communication connection with the pressure sensor 3, the control device is in communication connection with the switch of the nozzle 5, the control device is in communication connection with the alarm device, and the control device is in communication connection with the exhaust fan 4; the first static pressure value is set to 0Pa, the first pressure difference value is set to 5Pa, the first interval time is set to 30s, and the set air volume value section and nozzle correspondence table are shown in the following table.
In the initial state: both nozzles 5 are closed, the exhaust fan 4 is closed, and the static pressure value of the receiving chamber 1 is adjusted to a first static pressure value.
Referring to fig. 2, the method for automatically controlling the initial opening of the nozzle includes:
first, step S1 is executed to input a wind to be measured: the air quantity of the nameplate is 500m3An air outlet of the air conditioner 6 is communicated with the receiving chamber 1 through a pipeline 7, and wind to be detected is input into the receiving chamber 1 after the air conditioner 6 is started;
next, step S2 is executed to input a nameplate air quantity value to the control device, for example, the nameplate air quantity value of the wind to be measured is input to the control device through the input device to be 500m3/h；
Then, step S3 is executed to detect the real-time pressure value of the receiving chamber: the pressure sensor 3 detects a real-time pressure value of the receiving chamber 1 and transmits the real-time pressure value to the control device;
step S4 is executed to wait for the first interval time 30S;
step S5 is executed to determine whether the measurement state is normal: the control device obtains a real-time pressure difference value by adopting the difference between the real-time pressure value and the first static pressure value, if the real-time pressure difference value is smaller than the first pressure difference value, the step S6 is executed, and if the real-time pressure difference value is not smaller than the set pressure difference value, the step S7 is executed;
step S6, abnormity warning: the alarm device gives an alarm;
step S7, normally open nozzle: the control device searches the nameplate air quantity value of 500m in the air quantity value interval and nozzle corresponding table3And opening a nozzle 5 corresponding to the air volume value interval, namely opening a nozzle with the throat diameter of phi 80mm, and simultaneously opening the exhaust fan 4.
The execution timing of step S2 is not limited in the present invention, and the execution timing of step S2 is many, and it is only necessary to execute step S7 before executing step S. For example, step S2 is performed before step S1 is performed (as shown in fig. 3), or step S2 is performed after step S3 is performed but before step S4 is performed (as shown in fig. 4), or step S2 is performed after step S5 is performed but before step S7 is performed (as shown in fig. 5), or even some step before step S7 is performed simultaneously with step S2.
Air volume value interval and nozzle corresponding table
Because the wind to be measured is possible to be abnormal and the enthalpy difference chamber circulating air volume measuring device is possible to be abnormal, before the automatic control nozzle 5 is opened, the judgment on whether the measuring state is normal is added, when the abnormality does not occur, the nozzle 5 is opened according to the normal sequence, when the abnormality occurs, the control device controls the alarm device to give an alarm, so that an operator can conveniently discharge the abnormality in time, and the accuracy of the measured data is ensured.
In the above data, the first static pressure value and the first pressure difference value complement each other, and the determination condition of whether the measurement state is normal or not can be changed by arbitrarily changing one of the expressions, "nameplate air volume value-first static pressure value > first pressure difference value", and the expression "nameplate air volume value > first static pressure value + first pressure difference value" can also be transformed into "nameplate air volume value > first static pressure value + first pressure difference value", because the setting of "first static pressure value + first pressure difference value" is to determine whether the measurement state is normal or not in the following step, different air volumes to be measured can cause different changes in the pressure of the receiving chamber 1, and therefore the determination of "first static pressure value + first pressure difference value" can be adjusted automatically according to the measurement requirements.
Regarding the number and diameter of the nozzles, the number and diameter of the nozzles are specifically determined after a specific enthalpy difference chamber circulating air volume measuring device is selected, the value of the air volume to be measured blown out by the air outlet device should be within the air volume measuring range of the selected enthalpy difference chamber circulating air volume measuring device, and after the enthalpy difference chamber circulating air volume measuring device is selected, the air volume value interval and the nozzle corresponding table are set according to the mode in the first embodiment of the nozzle initial opening method of the enthalpy difference chamber circulating air volume measuring device.
Regarding the nameplate air volume value, the nameplate air volume value is the nominal air volume value of the air conditioner 6 to be measured, errors are inevitable in the production process, and the nameplate air volume value may be different from the air volume value of the air to be measured actually blown out by the air conditioner 6; before the actual air volume value of the wind to be measured is not measured, the nameplate air volume value is adopted to determine the opening condition of the nozzle 5 and the exhaust fan 4.
Regarding the first interval time, the first interval time is set to judge whether the measurement state is normal or not after the pressure of the receiving chamber 1 is stabilized, and the judgment error rate is reduced, so the specific value of the first interval time can be set as required; and setting a first interval time, and judging whether the measurement state is normal or not after inputting the wind to be measured and waiting for the first interval time. After the wind to be measured blows into the receiving chamber 1, the pressure of the receiving chamber 1 can rise along with the wind to be measured, and the pressure sensor 3 detects that the pressure of the receiving chamber 1 rises to indicate that the measurement state is normal, however, when the wind to be measured just inputs into the receiving chamber 1, the pressure of the receiving chamber 1 can be in an unstable state under the disturbance of air flow, the real-time pressure of the receiving chamber 1 can be favorable to becoming stable after the wind to be measured is input for a period of time, so that the real-time pressure value detected by the pressure sensor 3 is stable, therefore, the setting is favorable for judging whether the measurement state is normal after the wind to be measured is input and the first interval time is waited, and the judgment is more accurate.
Of course, the air volume value of the wind to be measured needs to be within the measurement range of the enthalpy difference chamber circulating air volume measuring device, that is, the air volume value of the wind to be measured should be within an air volume value interval and a certain air volume value interval in the nozzle corresponding table, so that the opening of the nozzle can be automatically controlled according to the air volume value interval and the nozzle corresponding table.
The first embodiment of the nozzle initial opening method of the same enthalpy difference chamber circulation air volume measuring device regarding the setting mode of the air volume value interval and the nozzle correspondence table is not described herein again. In the specific implementation, after the number of the nozzles 5 and the diameter of each nozzle 5 in the enthalpy difference chamber circulation air volume measuring device are determined, firstly, an air volume value interval and a nozzle corresponding table are made, and then, the automatic opening of the nozzles 5 and the exhaust fan 4 is realized according to the method of the technical scheme on the basis of the air volume value interval and the nozzle corresponding table.
With controlling means and exhaust fan 4 communication connection to open exhaust fan 4 when opening nozzle 5, make and to control exhaust fan 4 through controlling means, further promote enthalpy difference room circulation air volume measuring device's degree of automation, further reduce enthalpy difference room circulation air volume measuring device's the operation degree of difficulty.
Preferably, the exhaust fan 4 is a speed-regulating fan, and the control device regulates the air speed of the exhaust fan 4 according to the nameplate air volume value. The exhaust fan 4 is set as a speed-regulating fan, so that the control device can regulate the wind speed of the exhaust fan 4 according to different wind volume of the wind to be measured, and the exhaust speed can be matched with the input speed of the wind to be measured as far as possible. More preferably, the exhaust fan 4 is a variable frequency speed fan. The variable-frequency speed-regulating fan is one of the speed-regulating fans, the rotating speed of the exhaust fan 4 can be regulated more accurately and stably by adopting a variable-frequency speed-regulating mode, stepless speed regulation of the exhaust fan 4 is realized, and the exhaust speed of the exhaust fan 4 is conveniently matched with the input speed of wind to be measured better.
In the present embodiment, the air volume indicates a flow rate per unit time, the air volume indicates a flow rate value per unit time, and for example, the nameplate air volume indicates a volume value of an air volume which can be nominally blown out by the measured ventilator per unit time.
Finally, it should be emphasized that the above-described preferred embodiments of the present invention are merely examples of implementations, rather than limitations, and that many variations and modifications of the invention are possible to those skilled in the art, without departing from the spirit and scope of the invention.
Claims (6)
1. The nozzle initial opening method of the enthalpy difference chamber circulating air volume measuring device comprises a receiving chamber, an exhaust chamber, a pressure sensor, a control device and an alarm device, wherein 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 nozzles, and the control device is in communication connection with the alarm device;
the method comprises the following steps:
setting a first static pressure value, a first pressure difference value and a set air volume value interval and nozzle corresponding table for the control device;
inputting a nominal air quantity value: inputting a nominal air volume value to the control device;
inputting wind to be measured: inputting wind to be measured into the receiving chamber;
detecting a real-time pressure value of the receiving chamber: the pressure sensor detects a real-time pressure value of the receiving chamber and transmits the real-time pressure value to the control device;
judging whether the measurement state is normal: the control device adopts the difference between the real-time pressure value and the first static pressure value to obtain a real-time pressure difference value; if the real-time pressure difference value is smaller than the first pressure difference value, skipping to the following abnormal alarming step; if the real-time pressure difference is not smaller than the set pressure difference, skipping to the following normal nozzle opening step;
and (4) abnormal alarming: the alarm device gives an alarm;
normally opening the nozzle: and the control device searches an air volume value interval corresponding to the nominal air volume value in the air volume value interval and nozzle corresponding table, and opens the nozzle corresponding to the air volume value interval.
2. The method for initially opening a nozzle of an enthalpy difference chamber circulation air volume measuring apparatus according to claim 1, characterized in that:
the air volume value interval and the nozzle corresponding table are set according to the size of the throat section area of each nozzle and the air volume which can circulate in unit area.
3. The method for initially opening a nozzle of an enthalpy difference chamber circulation air volume measuring apparatus according to claim 1, characterized in that:
the enthalpy difference chamber circulating air volume measuring device also comprises an exhaust fan, the exhaust fan is arranged on the chamber wall of the exhaust chamber, and the control device is in communication connection with the exhaust fan;
and when the nozzle is opened, the exhaust fan is started.
4. The method for initially opening a nozzle of an enthalpy difference chamber circulation air volume measuring apparatus according to claim 3, characterized in that:
the exhaust fan is a speed-regulating fan, and the control device regulates the wind speed of the exhaust fan according to the nominal wind quantity value.
5. The method for initially opening a nozzle of an enthalpy difference chamber circulation air volume measuring apparatus according to claim 4, characterized in that:
the exhaust fan is a variable-frequency speed-regulating fan.
6. The method for initially opening a nozzle of an enthalpy difference chamber circulation air volume measuring apparatus according to any one of claims 1 to 5, characterized in that:
and setting a first interval time, and judging whether the measurement state is normal or not after inputting the wind to be measured and waiting for the first interval time.
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| CN201811336041.2A CN109520572B (en) | 2018-11-09 | 2018-11-09 | Enthalpy difference chamber circulating air volume measuring device and initial opening method of nozzle thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1664524A (en) * | 2005-03-28 | 2005-09-07 | 杭州家和智能控制有限公司 | Fan coil heat exchange quantity metering method by air side enthalpy potential method |
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| JP2005308606A (en) * | 2004-04-23 | 2005-11-04 | Shinko Kogyo Co Ltd | Airflow meter for fan chamber of air conditioner |
| CN100575909C (en) * | 2006-08-11 | 2009-12-30 | 比亚迪股份有限公司 | Blower performance test system and method for testing thereof |
| CN204835303U (en) * | 2015-08-08 | 2015-12-02 | 南京博纳威电子科技有限公司 | Can sealed air conditioning switch cabinet |
| CN206257781U (en) * | 2016-09-26 | 2017-06-16 | 苏州天弘益华机电有限公司 | A kind of laboratory multistage ventilated energy-saving control system |
| CN106871371A (en) * | 2017-03-14 | 2017-06-20 | 广州市高衡力节能科技股份有限公司 | Tail end of central air conditioner metering and control device based on air enthalpy difference |
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| CN1664524A (en) * | 2005-03-28 | 2005-09-07 | 杭州家和智能控制有限公司 | Fan coil heat exchange quantity metering method by air side enthalpy potential method |
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