CN116202710A - Gas circuit structure, pressure testing device and method - Google Patents
Gas circuit structure, pressure testing device and method Download PDFInfo
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- CN116202710A CN116202710A CN202211733029.1A CN202211733029A CN116202710A CN 116202710 A CN116202710 A CN 116202710A CN 202211733029 A CN202211733029 A CN 202211733029A CN 116202710 A CN116202710 A CN 116202710A
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- electromagnetic valve
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- absolute pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
Abstract
The invention particularly relates to a gas path structure, a pressure testing device and a pressure testing method. The first air path comprises an air inlet, a pressure regulating valve, a first electromagnetic valve and an air outlet which are sequentially connected, and the air outlet is used for being communicated with the detected flowmeter. The air inlet end of the second air channel is communicated with the first air channel and is positioned between the first electromagnetic valve and the air outlet, the air outlet end of the second air channel is used for being communicated with the reference volume tank, and the second air channel is provided with a fourth electromagnetic valve. The differential pressure transmitter is arranged on the second air path, the first end of the differential pressure transmitter is communicated between the air inlet end of the second air path and the fourth electromagnetic valve, and the second end of the differential pressure transmitter is communicated between the air outlet end of the second air path and the fourth electromagnetic valve. The gas circuit structure can detect whether the flowmeter has tiny leakage in a short time, and is beneficial to improving the accuracy and the accuracy of gas circuit detection.
Description
Technical Field
The invention belongs to the technical field of gas circuit detection, and particularly relates to a gas circuit structure, a pressure testing device and a pressure testing method.
Background
At present, the flowmeter needs to be subjected to leakage test when leaving the factory, the leakage test in the market mostly adopts blind plates at two ends of the flowmeter, then a pressure pipe is led out from one end of the blind plates, an absolute pressure transmitter is arranged on the pressure pipe, after pressure gas is injected into a cavity, a valve is closed after the pressure gas is filled into the cavity, whether the pressure value of the absolute pressure transmitter is reduced or not is observed, and therefore whether air leakage exists or not is judged.
However, because the pressure range of the flow meter to be detected is wide, the range of the absolute pressure transmitter is required to be large, so that the sensitivity is low, and under the conditions that the volume of the flow meter to be detected is large and the leakage point is small, whether leakage exists can not be detected in a short time, the absolute pressure transmitter indicating value can jump only after a long time, and the efficiency is low.
Disclosure of Invention
The invention aims to at least solve the problems of low sensitivity and long detection time existing in the existing flowmeter during factory detection. The aim is achieved by the following technical scheme:
the first aspect of the present invention proposes a gas circuit structure, comprising:
the first air path comprises an air inlet, a pressure regulating valve, a first electromagnetic valve and an air outlet which are sequentially connected, and the air outlet is used for being communicated with a detected flowmeter;
the air inlet end of the second air channel is communicated with the first air channel and is positioned between the first electromagnetic valve and the air outlet, the air outlet end of the second air channel is used for being communicated with a reference volume tank, and a fourth electromagnetic valve is arranged on the second air channel;
the differential pressure transmitter is arranged on the second air path, a first end of the differential pressure transmitter is communicated and arranged between an air inlet end of the second air path and the fourth electromagnetic valve, and a second end of the differential pressure transmitter is communicated and arranged between an air outlet end of the second air path and the fourth electromagnetic valve.
The gas circuit structure comprises a first gas circuit, a second gas circuit and a differential pressure transmitter. Through set up the second gas circuit on first gas circuit for examined flowmeter and reference volume jar respectively with the inlet end and the end intercommunication of giving vent to anger of second gas circuit, and cooperate the differential pressure transmitter on the second gas circuit, make this gas circuit structure detect out whether the flowmeter has the condition of tiny leakage in the shorter time, thereby improve sensitivity and the accuracy that the gas circuit detected, help solving current flowmeter and dispatch from the factory when examining, the sensitivity that exists is low, and the longer problem of detection time.
In addition, the air path structure according to the invention can also have the following additional technical characteristics:
in some embodiments of the invention, further comprising:
the first end of the third air passage is communicated with the first air passage and is positioned between the air inlet end of the second air passage and the first electromagnetic valve, the second end of the third air passage is communicated with the second air passage and is positioned between the second end of the differential pressure transmitter and the fourth electromagnetic valve, and the third air passage is provided with an adjusting valve;
the absolute pressure transmitter is communicated with the third air path and is positioned between the regulating valve and the first end of the third air path;
the first air passage is also provided with a third electromagnetic valve and a fourth air passage, the third electromagnetic valve is positioned between the first end of the third air passage and the air inlet end of the second air passage, the air inlet end of the fourth air passage is positioned between the first electromagnetic valve and the third electromagnetic valve, and the air outlet end of the fourth air passage is provided with a second electromagnetic valve;
and a fifth electromagnetic valve is further arranged on the second air path and is positioned between the second end of the third air path and the second end of the differential pressure transmitter.
In some embodiments of the invention, the range of the differential pressure transmitter is 1% of the range of the absolute pressure transmitter.
The second aspect of the invention provides a pressure testing device for testing a flowmeter, which comprises the gas path structure and a reference volume tank, wherein the volume of the reference volume tank is 0.5L-1L.
A third aspect of the present invention proposes a pressure testing method applied to a pressure testing device according to the present invention, the method comprising:
the flow meter to be detected is arranged on an air outlet of the first air path;
according to the state that the regulating valve, the first electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve are all opened, the second electromagnetic valve is closed, and detection gas is flushed into the air inlet of the first air channel;
after reaching a first preset pressure value according to the indication value of the absolute pressure transmitter and being stable, closing the first electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve, and opening the second electromagnetic valve;
closing the second electromagnetic valve after the indication value of the absolute pressure transmitter reaches a second preset pressure value, and observing the indication value of the absolute pressure transmitter;
determining that the detected flowmeter has no leakage condition according to the fact that neither the indication value of the absolute pressure transmitter nor the indication value of the differential pressure transmitter is changed;
and opening the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve to release pressure.
In some embodiments of the invention, the second preset pressure value is 10% -90% of the first preset pressure value.
In some embodiments of the present invention, after the indication value of the absolute pressure transmitter reaches a second preset pressure value, closing the second electromagnetic valve, and observing the indication value of the absolute pressure transmitter and the indication value of the differential pressure transmitter, the method further includes:
and determining that the detected flowmeter has leakage according to the fact that the indication value of the absolute pressure transmitter is not changed any more and the indication value of the differential pressure transmitter is reduced.
In some embodiments of the present invention, after the indication value of the absolute pressure transmitter reaches a second preset pressure value, closing the second electromagnetic valve, and observing the indication value of the absolute pressure transmitter and the indication value of the differential pressure transmitter, the method further includes:
and determining that the second electromagnetic valve has leakage according to the declining indication value of the absolute pressure transmitter.
In some embodiments of the present invention, after the indication value of the absolute pressure transmitter reaches a second preset pressure value, closing the second electromagnetic valve, and observing the indication value of the absolute pressure transmitter and the indication value of the differential pressure transmitter, the method further includes:
closing the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve according to the rise of the indication value of the absolute pressure transmitter, and blocking the air outlet;
regulating the pressure regulating valve to the indication value of the absolute pressure transmitter to be a first preset pressure value, and observing the indication value of the absolute pressure transmitter;
and determining that the first electromagnetic valve has leakage according to the rise of the indication value of the absolute pressure transmitter.
In some embodiments of the present invention, the adjusting the pressure regulating valve to the absolute pressure transmitter has a first preset pressure value, and after observing the absolute pressure transmitter, the method further includes:
closing the regulating valve according to no change of the indication value of the absolute pressure transmitter, and opening the first electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve until the indication value of the absolute pressure transmitter is the first preset pressure value;
closing the first electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve, opening the second electromagnetic valve to release pressure, and closing the second electromagnetic valve after the pressure release is completed;
determining that the third electromagnetic valve has leakage according to the rise of the indication value of the absolute pressure transmitter;
opening the second electromagnetic valve and the third electromagnetic valve to release pressure, and closing the second electromagnetic valve after the pressure release is completed;
determining that the fourth electromagnetic valve has leakage according to the rise of the indication value of the absolute pressure transmitter;
opening the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve to release pressure, and closing the second electromagnetic valve after the pressure release is completed;
determining that the fifth electromagnetic valve has leakage according to the rise of the indication value of the absolute pressure transmitter;
and replacing the electromagnetic valve with the leakage condition, and repeating the steps until the leakage condition does not exist in the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
fig. 1 is a schematic structural diagram of a gas circuit structure according to an embodiment of the present invention.
The various references in the drawings are as follows:
1. a first air path; 11. an air inlet;
2. a second air path;
3. a third air path;
41. a pressure regulating valve; 42. adjusting a valve;
51. a first electromagnetic valve; 52. a second electromagnetic valve; 53. a third electromagnetic valve; 54. a fourth electromagnetic valve; 55. a fifth electromagnetic valve;
6. a reference volume tank;
7. a flow meter to be inspected;
8. an absolute pressure transmitter;
9. a differential pressure transmitter.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For ease of description, spatially relative terms, such as "inner," "outer," "lower," "below," "upper," "above," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.
As shown in fig. 1, according to an embodiment of the present invention, a first aspect proposes a gas path structure, which includes a first gas path 1, a second gas path 2, and a differential pressure transmitter 9 in its overall design.
The first air path 1 comprises an air inlet 11, a pressure regulating valve 41, a first electromagnetic valve 51 and an air outlet which are sequentially connected, and the air outlet is used for being communicated with the detected flowmeter 7. The air inlet end of the second air channel 2 is communicated with the first air channel 1 and is positioned between the first electromagnetic valve 51 and the air outlet, the air outlet end of the second air channel 2 is used for being communicated with the reference volume tank 6, and the second air channel 2 is provided with a fourth electromagnetic valve 54. The differential pressure transmitter 9 is arranged on the second gas path 2, a first end of the differential pressure transmitter 9 is communicated and arranged between the gas inlet end of the second gas path 2 and the fourth electromagnetic valve 54, and a second end of the differential pressure transmitter 9 is communicated and arranged between the gas outlet end of the second gas path 2 and the fourth electromagnetic valve 54.
According to the gas circuit structure, the second gas circuit 2 is arranged on the first gas circuit 1, so that the detected flowmeter 7 and the reference volume tank 6 are respectively communicated with the gas inlet end and the gas outlet end of the second gas circuit 2, and the gas circuit structure can detect whether the detected flowmeter 7 has micro leakage or not in a short time by matching with the differential pressure transmitter 9 on the second gas circuit 2, thereby improving the sensitivity and the accuracy of gas circuit detection, and being beneficial to solving the problems of low sensitivity and long detection time existing in the existing flowmeter when leaving a factory for detection.
Specifically, the first gas path 1 has a gas inlet 11 and a gas outlet, wherein the gas inlet 11 is for communicating with an external device to be able to flush in the detected gas, and the gas outlet is for communicating with the flow meter 7 to be detected. Between the gas inlet 11 and the gas outlet, a pressure regulating valve 41 and a first solenoid valve 51 are provided in this order along the flow direction of the gas. A three-way interface is provided between the first solenoid valve 51 and the air outlet, and the air inlet end of the second air path 2 is mounted on the three-way interface. Wherein, be provided with fourth solenoid valve 54 on second gas circuit 2, the end of giving vent to anger of second gas circuit 2 is used for communicating with reference volume jar 6. Meanwhile, the first end of the differential pressure transmitter 9 is communicated and arranged between the air inlet end of the second air channel 2 and the fourth electromagnetic valve 54 through a three-way interface, and the second end of the differential pressure transmitter 9 is communicated and arranged between the air outlet end of the second air channel 2 and the fourth electromagnetic valve 54 through a three-way interface. The three-way interface is adopted to communicate the first air passage 1, the second air passage 2 and the differential pressure transmitter 9, which is beneficial to the assembly, maintenance and replacement of the air passage structure.
In some embodiments of the invention, the gas circuit structure further comprises a third gas circuit 3 and an absolute pressure transmitter 8. The first end of the third air channel 3 is communicated with the first air channel 1 and is located between the air inlet end of the second air channel 2 and the first electromagnetic valve 51, the second end of the third air channel 3 is communicated with the second air channel 2 and is located between the second end 9 of the differential pressure transmitter 9 and the fourth electromagnetic valve 54, and the third air channel 3 is provided with an adjusting valve 42. The absolute pressure transmitter 8 is arranged on the third air channel 3 in a communicating way and is positioned between the adjusting valve 42 and the first end of the third air channel 3. Meanwhile, a third electromagnetic valve 53 and a fourth air passage are further arranged on the first air passage 1, the third electromagnetic valve 53 is located between the first end of the third air passage 3 and the air inlet end of the second air passage 2, the air inlet end of the fourth air passage is located between the first electromagnetic valve 51 and the third electromagnetic valve 53, and the air outlet end of the fourth air passage is provided with a second electromagnetic valve 52. The second air path 2 is further provided with a fifth electromagnetic valve 55, and the fifth electromagnetic valve 55 is located between the second end of the third air path 3 and the second end of the differential pressure transmitter 9.
Specifically, a third electromagnetic valve 53 is further disposed on the first air path 1, and the third electromagnetic valve 53 is located between the first electromagnetic valve 51 and the air inlet end of the second air path 2. As also shown in fig. 1, a four-way joint is provided between the first solenoid valve 51 and the third solenoid valve 53, on which the first end of the third air passage 3 is mounted. Meanwhile, a fifth electromagnetic valve 55 is further arranged on the second gas circuit 2, and the fifth electromagnetic valve 55 is positioned between the fourth electromagnetic valve 54 and the second end of the differential pressure transmitter 9. In the present embodiment, a three-way joint is provided between the fourth solenoid valve 54 and the fifth solenoid valve 55, and the second end of the third gas passage 3 is attached to the three-way joint.
As also shown in fig. 1, an adjusting valve 42 is provided on the third air path 3. In the present embodiment, the regulator valve 42 is provided as a regulator valve. A three-way interface is arranged between the first end of the third air path 3 and the regulating valve 42, and the absolute pressure transmitter 8 is communicated with the three-way interface. Meanwhile, the air inlet end of the fourth air channel is also arranged on the four-way joint, and the air outlet end of the fourth air channel is provided with a second electromagnetic valve 52 which can be communicated with the outside and is used for discharging the air in the first air channel 1, the second air channel 2 and the third air channel 3.
In some embodiments of the present invention, the range of differential pressure transmitter 9 is 1% of the range of absolute pressure transmitter 8. Because the pipeline volume of the gas circuit structure is small, the leakage can be detected by an absolute pressure measurer. By limiting the range of the differential pressure transmitter 9, the sensitivity of pressure detection is improved, and the detection efficiency of the gas circuit structure is improved. Of course, other data can be adopted in the measuring range of the differential pressure transmitter 9, so that the detection sensitivity can be further improved, and the detection efficiency can be ensured.
The second aspect of the present embodiment also relates to a pressure testing device for testing a flow meter, the pressure testing device including the above-described air path structure and the reference volume tank 6. The pressure detection device has been fitted with the air circuit structure in advance before use and, at the same time, the reference volume tank 6 has been fitted at the outlet of the second air circuit 2. Specifically, the reference volume tank 6 has a volume of 0.5L to 1L, and since the reference volume tank 6 is a closed vessel tank, the pressure in the reference volume tank 6 is constant. In the present embodiment, the volume of the reference volume tank 6 is 1L, contributing to a reduction in the influence of pressure fluctuations due to changes in ambient temperature.
The third aspect of the present embodiment further relates to a pressure testing method, which is applied to the pressure testing device, and the method includes:
the detected flowmeter 7 is arranged on the air outlet of the first air path 1;
according to the state that the regulating valve 42, the first electromagnetic valve 51, the third electromagnetic valve 53, the fourth electromagnetic valve 54 and the fifth electromagnetic valve 55 are all opened, the second electromagnetic valve 52 is closed, and the detection gas is flushed into the gas inlet 11 of the first gas path 1;
after reaching a first preset pressure value according to the indication value of the absolute pressure transmitter 8 and being stable, closing the first electromagnetic valve 51, the third electromagnetic valve 53, the fourth electromagnetic valve 54 and the fifth electromagnetic valve 55, and opening the second electromagnetic valve 52;
after the indication value of the absolute pressure transmitter 8 reaches a second preset pressure value, closing the second electromagnetic valve 52, and observing the indication value of the absolute pressure transmitter 8 and the indication value of the differential pressure transmitter 9;
according to the fact that neither the indication value of the absolute pressure transmitter 8 nor the indication value of the differential pressure transmitter 9 is changed, determining that the detected flowmeter 7 has no leakage condition;
the first solenoid valve 51, the third solenoid valve 53, the fourth solenoid valve 54, and the fifth solenoid valve 55 are opened to release the pressure.
Specifically, the pressure testing device is installed and fixed, and then the flowmeter 7 to be tested is installed on the air outlet of the first air path 1. After the installation of the flowmeter 7 to be inspected is completed, the first gas path 1 is filled with the detection gas, and at this time, the first solenoid valve 51, the second solenoid valve 52, the third solenoid valve 53, the fourth solenoid valve 54, and the fifth solenoid valve 55 are all closed, and the regulating valve 42 is opened. Then, the first, third, fourth and fifth solenoid valves 51, 53, 54 and 55 are adjusted to an open state to guide the injection of the detection gas into the flow meter 7 and the reference volume tank 6, and at this time, the pressure regulating valve 41 is adjusted so that the absolute pressure transducer 8 reaches a first preset pressure value and the pressure is stabilized, and then the first, third, fourth and fifth solenoid valves 51, 53, 54 and 55 are adjusted to a closed state.
Then, the second solenoid valve 52 is adjusted to an open state to perform the pressure release process. When the indication of the absolute pressure transmitter 8 reaches a second preset pressure value, the second solenoid valve 52 is adjusted to a closed state and the indication of the absolute pressure transmitter 8 is observed. When the indication value of the absolute pressure transmitter 8 and the indication value of the differential pressure transmitter 9 are not changed, it is determined that the detected flowmeter 7 has no leakage condition, and finally, the second electromagnetic valve 52, the third electromagnetic valve 53, the fourth electromagnetic valve 54 and the fifth electromagnetic valve 55 are all adjusted to be in an open state, so that the pressure in the detected flowmeter 7 and the reference volume tank 6 is released, and the dismounting safety of the detected flowmeter 7 is ensured.
Specifically, the second preset pressure value is 10% -90% of the first preset pressure value. In the present embodiment, the setting of the first preset pressure value may be defined according to the measurement range of the actual flow meter 7 to be inspected, and the first preset pressure value is preferably 1.1 times the measurement range of the flow meter 7 to be inspected. Meanwhile, the setting of the second preset pressure value can be selected according to practical situations, and preferably, the second preset pressure value is 50% of the first preset pressure value. And at this time, the change value of the absolute pressure transmitter 8 is larger, so that the observation is convenient, and meanwhile, the third air channel 3 is ensured to still have certain air pressure.
In some embodiments of the present invention, after reaching the second preset pressure value according to the indication value of the absolute pressure transmitter 8, the second solenoid valve 52 is closed, and the indication value of the absolute pressure transmitter 8 and the indication value of the differential pressure transmitter 9 are observed, further comprising:
according to the fact that the indication value of the absolute pressure transmitter 8 is not changed any more, the indication value of the differential pressure transmitter 9 is reduced, and the leakage condition of the detected flowmeter 7 is determined.
Specifically, when the indication of absolute pressure transmitter 8 no longer changes and the indication of differential pressure transmitter 9 drops, it can be determined that a leak condition exists in the meter under test 7. Of course, if the indication value of the differential pressure transmitter 9 rises, it is explained that there is a leakage condition of the reference volume tank 6 or a problem that the installation of the reference volume tank 6 is not standardized. By adopting the change of the differential pressure transmitter 9, whether the detected flowmeter 7 has leakage or not can be determined, and the detection effect is good and the detection efficiency is high.
In some embodiments of the present invention, after reaching the second preset pressure value according to the indication value of the absolute pressure transmitter 8, the second solenoid valve 52 is closed, and the indication value of the absolute pressure transmitter 8 and the indication value of the differential pressure transmitter 9 are observed, further comprising:
from the drop in the indication of absolute pressure transmitter 8, it is determined that a leak condition exists in second solenoid valve 52.
Specifically, when a change occurs in the indication of absolute pressure transmitter 8, and at this time, it may be temporarily unnecessary to observe the indication of differential pressure transmitter 9. When the indication of absolute pressure transmitter 8 drops, it can be determined that a leak condition exists in second solenoid valve 52. At this time, the second solenoid valve 52 needs to be replaced to ensure that the gas path structure is free from leakage, and can be used to detect the flow meter.
In some embodiments of the present invention, after reaching the second preset pressure value according to the indication value of the absolute pressure transmitter 8, the second solenoid valve 52 is closed, and the indication value of the absolute pressure transmitter 8 and the indication value of the differential pressure transmitter 9 are observed, further comprising:
according to the rise of the indication value of the absolute pressure transmitter 8, the first electromagnetic valve 51, the second electromagnetic valve 52, the third electromagnetic valve 53, the fourth electromagnetic valve 54 and the fifth electromagnetic valve 55 are closed, and the air outlet is blocked;
adjusting the pressure regulating valve 41 to the indicating value of the absolute pressure transmitter 8 to be a first preset pressure value, and observing the indicating value of the absolute pressure transmitter 8;
the presence of a leak in the first solenoid valve 51 is determined based on the rise in the absolute pressure transducer 8 indication.
Specifically, when the indication value of the absolute pressure transmitter 8 rises, it can be determined that the second solenoid valve 52 is not in a leaking condition, and one or more of the first solenoid valve 51, the third solenoid valve 53, the fourth solenoid valve 54, and the fifth solenoid valve 55 is in a leaking condition. Since the first electromagnetic valve 51 is disposed close to the intake port 11 provided in the first air passage 1 and the second electromagnetic valve 52 is disposed between the first electromagnetic valve 51 and the third electromagnetic valve 53, it is preferable to determine whether or not there is a leak condition of the first electromagnetic valve 51.
In the present embodiment, the first solenoid valve 51, the second solenoid valve 52, the third solenoid valve 53, the fourth solenoid valve 54, and the fifth solenoid valve 55 may be adjusted to be in the closed state preferentially, and the end of the flow meter 7 to be inspected may be closed with a blind plate to close the air outlet. Then, by adjusting the pressure regulating valve 41, after the indication value of the absolute pressure transmitter 8 reaches the first preset pressure value, whether the indication value of the absolute pressure transmitter 8 changes or not is observed. When the indication of absolute pressure transmitter 8 rises, it can be determined that a leak condition exists in first solenoid valve 51. If the indication of absolute pressure transmitter 8 does not change, it can be determined that there is no leakage from first solenoid valve 51.
In some embodiments of the present invention, adjusting the pressure regulating valve 41 to the indication value of the absolute pressure transmitter 8 to the first preset pressure value, after observing the indication value of the absolute pressure transmitter 8, further includes:
according to the absolute pressure transmitter 8 indication value no longer changes, closing the regulating valve 42, and opening the first electromagnetic valve 51, the third electromagnetic valve 53, the fourth electromagnetic valve 54 and the fifth electromagnetic valve 55 until the absolute pressure transmitter 8 indication value is a first preset pressure value;
closing the first electromagnetic valve 51, the third electromagnetic valve 53, the fourth electromagnetic valve 54 and the fifth electromagnetic valve 55, opening the second electromagnetic valve 52 for pressure relief, and closing the second electromagnetic valve 52 after the pressure relief is completed;
determining that the third electromagnetic valve 53 has leakage according to the rise of the indication value of the absolute pressure transmitter 8;
opening the second electromagnetic valve 52 and the third electromagnetic valve 53 to release pressure, and closing the second electromagnetic valve 52 after the pressure release is completed;
determining that the fourth electromagnetic valve 54 has a leakage condition according to the rise of the indication value of the absolute pressure transmitter 8;
opening the second electromagnetic valve 52, the third electromagnetic valve 53 and the fourth electromagnetic valve 54 to release pressure, and closing the second electromagnetic valve 52 after the pressure release is completed;
determining that the fifth electromagnetic valve 55 has leakage according to the rise of the indication value of the absolute pressure transmitter 8;
the solenoid valves having the leakage condition are replaced, and the above steps are repeated until none of the first solenoid valve 51, the second solenoid valve 52, the third solenoid valve 53, the fourth solenoid valve 54, and the fifth solenoid valve 55 has the leakage condition.
Specifically, after it is determined that the first solenoid valve 51 has no leakage, the regulating valve 42 is closed, the first solenoid valve 51, the third solenoid valve 53, the fourth solenoid valve 54 and the fifth solenoid valve 55 are regulated to be in an open state, when the indication value of the absolute pressure transmitter 8 is a first preset pressure value, the first solenoid valve 51, the third solenoid valve 53, the fourth solenoid valve 54 and the fifth solenoid valve 55 are regulated to be in a closed state, the second solenoid valve 52 is regulated to be in an open state, and the pressure relief treatment is performed on the gas path structure. In this embodiment, the second solenoid valve 52 may be closed to stop the pressure relief when the indication value of the absolute pressure transmitter 8 is a second preset pressure value. Of course, the absolute pressure transmitter 8 may have other pressure values to enable observation.
If the pressure relief is completed and the indication value of the absolute pressure transmitter 8 will rise at this time, it can be determined that the third electromagnetic valve 53 has a leakage condition; if the indication of absolute pressure transmitter 8 does not change, it is indicated that third solenoid valve 53 is not leaking.
Then, the second electromagnetic valve 52 and the third electromagnetic valve 53 are adjusted to be in an opened state for pressure relief, after the pressure relief is completed, the second electromagnetic valve 52 is closed, and at the moment, if the indication value of the absolute pressure transmitter 8 rises, the leakage condition of the fourth electromagnetic valve 54 can be determined; if the indication of absolute pressure transmitter 8 does not change, it is indicated that there is no leak in fourth solenoid valve 54.
Then, the second electromagnetic valve 52, the third electromagnetic valve 53 and the fourth electromagnetic valve 54 are kept in an opened state so as to be capable of pressure relief, after the pressure relief is completed, the second electromagnetic valve 52 is closed, and at the moment, if the indication value of the absolute pressure transmitter 8 is increased, the leakage condition of the fifth electromagnetic valve 55 can be determined; if the indication of absolute pressure transmitter 8 does not change, it is indicated that there is no leak in fifth solenoid valve 55.
When one or more of the first, second, third, fourth and fifth solenoid valves 51, 52, 53, 54 and 55 leaks, the corresponding solenoid valve needs to be replaced, and then the above steps are repeated until the first, second, third, fourth and fifth solenoid valves 51, 52, 53, 54 and 55 are finished without leakage, and at this time, detection of the flow meter can be performed.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (10)
1. A gas circuit structure, comprising:
the first air path comprises an air inlet, a pressure regulating valve, a first electromagnetic valve and an air outlet which are sequentially connected, and the air outlet is used for being communicated with a detected flowmeter;
the air inlet end of the second air channel is communicated with the first air channel and is positioned between the first electromagnetic valve and the air outlet, the air outlet end of the second air channel is used for being communicated with a reference volume tank, and a fourth electromagnetic valve is arranged on the second air channel;
the differential pressure transmitter is arranged on the second air path, a first end of the differential pressure transmitter is communicated and arranged between an air inlet end of the second air path and the fourth electromagnetic valve, and a second end of the differential pressure transmitter is communicated and arranged between an air outlet end of the second air path and the fourth electromagnetic valve.
2. The gas circuit structure of claim 1, further comprising:
the first end of the third air passage is communicated with the first air passage and is positioned between the air inlet end of the second air passage and the first electromagnetic valve, the second end of the third air passage is communicated with the second air passage and is positioned between the second end of the differential pressure transmitter and the fourth electromagnetic valve, and the third air passage is provided with an adjusting valve;
the absolute pressure transmitter is communicated with the third air path and is positioned between the regulating valve and the first end of the third air path;
the first air passage is also provided with a third electromagnetic valve and a fourth air passage, the third electromagnetic valve is positioned between the first end of the third air passage and the air inlet end of the second air passage, the air inlet end of the fourth air passage is positioned between the first electromagnetic valve and the third electromagnetic valve, and the air outlet end of the fourth air passage is provided with a second electromagnetic valve;
and a fifth electromagnetic valve is further arranged on the second air path and is positioned between the second end of the third air path and the second end of the differential pressure transmitter.
3. The gas circuit structure of claim 2, wherein the range of the differential pressure transmitter is 1%o of the range of the absolute pressure transmitter.
4. A pressure testing device for testing a flow meter, comprising the air path structure of claim 1 or 2 and a reference volume tank, the reference volume tank having a volume of 0.5L-1L.
5. A pressure testing method, characterized in that the method is applied to the pressure testing device according to any one of claims 3 or 4, the method comprising:
the flow meter to be detected is arranged on an air outlet of the first air path;
according to the state that the regulating valve, the first electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve are all opened, the second electromagnetic valve is closed, and detection gas is flushed into the air inlet of the first air channel;
after reaching a first preset pressure value according to the indication value of the absolute pressure transmitter and being stable, closing the first electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve, and opening the second electromagnetic valve;
closing the second electromagnetic valve after the indication value of the absolute pressure transmitter reaches a second preset pressure value, and observing the indication value of the absolute pressure transmitter and the indication value of the differential pressure transmitter;
determining that the detected flowmeter has no leakage condition according to the fact that neither the indication value of the absolute pressure transmitter nor the indication value of the differential pressure transmitter is changed;
and opening the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve to release pressure.
6. The pressure testing method of claim 5, wherein the second preset pressure value is 10% -90% of the first preset pressure value.
7. The method according to claim 5, wherein after the indication value of the absolute pressure transmitter reaches a second preset pressure value, closing the second electromagnetic valve, and observing the indication value of the absolute pressure transmitter and the indication value of the differential pressure transmitter, further comprising:
and determining that the detected flowmeter has leakage according to the fact that the indication value of the absolute pressure transmitter is not changed any more and the indication value of the differential pressure transmitter is reduced.
8. The method according to claim 5, wherein after the indication value of the absolute pressure transmitter reaches a second preset pressure value, closing the second electromagnetic valve, and observing the indication value of the absolute pressure transmitter and the indication value of the differential pressure transmitter, further comprising:
and determining that the second electromagnetic valve has leakage according to the declining indication value of the absolute pressure transmitter.
9. The method of claim 8, wherein after the indication of the absolute pressure transmitter reaches a second preset pressure value, closing the second solenoid valve, and observing the indication of the absolute pressure transmitter and the indication of the differential pressure transmitter, further comprising:
closing the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve according to the rise of the indication value of the absolute pressure transmitter, and blocking the air outlet;
regulating the pressure regulating valve to the indication value of the absolute pressure transmitter to be a first preset pressure value, and observing the indication value of the absolute pressure transmitter;
and determining that the first electromagnetic valve has leakage according to the rise of the indication value of the absolute pressure transmitter.
10. The method of claim 9, wherein the adjusting the pressure regulating valve to the absolute pressure transmitter has a first predetermined pressure value, and further comprising, after observing the absolute pressure transmitter's value:
closing the regulating valve according to no change of the indication value of the absolute pressure transmitter, and opening the first electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve until the indication value of the absolute pressure transmitter is the first preset pressure value;
closing the first electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve, opening the second electromagnetic valve to release pressure, and closing the second electromagnetic valve after the pressure release is completed;
determining that the third electromagnetic valve has leakage according to the rise of the indication value of the absolute pressure transmitter;
opening the second electromagnetic valve and the third electromagnetic valve to release pressure, and closing the second electromagnetic valve after the pressure release is completed;
determining that the fourth electromagnetic valve has leakage according to the rise of the indication value of the absolute pressure transmitter;
opening the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve to release pressure, and closing the second electromagnetic valve after the pressure release is completed;
determining that the fifth electromagnetic valve has leakage according to the rise of the indication value of the absolute pressure transmitter;
and replacing the electromagnetic valve with the leakage condition, and repeating the steps until the leakage condition does not exist in the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211733029.1A CN116202710A (en) | 2022-12-30 | 2022-12-30 | Gas circuit structure, pressure testing device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211733029.1A CN116202710A (en) | 2022-12-30 | 2022-12-30 | Gas circuit structure, pressure testing device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116202710A true CN116202710A (en) | 2023-06-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211733029.1A Pending CN116202710A (en) | 2022-12-30 | 2022-12-30 | Gas circuit structure, pressure testing device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116202710A (en) |
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2022
- 2022-12-30 CN CN202211733029.1A patent/CN116202710A/en active Pending
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