CN112444351A - Gas path system for detecting air tightness of air pressure element - Google Patents
Gas path system for detecting air tightness of air pressure element Download PDFInfo
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- CN112444351A CN112444351A CN201910826764.9A CN201910826764A CN112444351A CN 112444351 A CN112444351 A CN 112444351A CN 201910826764 A CN201910826764 A CN 201910826764A CN 112444351 A CN112444351 A CN 112444351A
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- air
- pressure
- valve
- way switch
- switch valve
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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
-
- 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
- G01M3/2876—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 valves
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a gas circuit system for detecting the air tightness of an air pressure element, which comprises: the gas source mechanism is connected to the two-way switch valve through a first inflation pipeline, the two-way switch valve is connected to the air pressure element through a second inflation pipeline, the pressure sensor is used for checking the air pressure of the second inflation pipeline, and the gas path system further comprises a three-way switch valve; the three-way switch valve is at least provided with an air inlet, an air outlet and a pressure relief opening, and the air inlet and the air outlet are connected to the first inflation pipeline; the three-way switching valve further has: a first state in which the air inlet is communicated with the air outlet and the air inlet, the air outlet and the pressure relief opening are all cut off; and a second state in which the air inlet, the air outlet and the pressure relief opening are cut off, and the pressure relief opening is communicated with the air outlet.
Description
Technical Field
The invention relates to the technical field of test equipment, in particular to an air path system for detecting the air tightness of an air pressure element.
Background
In the prior art, as shown in fig. 1, an air path system for checking the airtightness of an air pressure element 600 such as a pneumatic valve generally includes: the air source mechanism 100 is connected to the two-way switch valve 200 via a first inflation line 400, the two-way switch valve 200 is connected to the air pressure element 600 via a second inflation line 500, and the pressure sensor 300 is connected to the second inflation line 500. When the pressure sensor is used, the two-way switch valve is opened firstly, the air source mechanism is utilized to inflate the air pressure element, when the pressure of the second inflation pipeline reaches the detection pressure, the two-way switch valve is closed, then, whether the pressure value of the pressure sensor changes or not is observed, when the pressure sensor displays that the pressure drop generated by the second inflation pipeline is fast, the air tightness of the detected air pressure element is poor, and when the pressure sensor displays that the pressure drop generated by the second inflation pipeline is not generated or is slow, the air tightness of the detected air pressure element is good.
The gas circuit system in the prior art has the following defects:
if the two-way switch valve causes the self air tightness reduction due to some reason, such as service life, damage, etc., when the pressure sensor does not produce pressure drop or produces pressure drop slower, the air tightness of the detected air pressure element can not be explained to be better because: the air pressure mechanism inevitably needs to operate continuously, even when the two-way switch valve is closed, the air pressure mechanism can continuously inflate the first inflation pipeline, so that even if the two-way switch valve is in a closed state, if the air tightness of the two-way switch valve is poor, the air source mechanism can enter the second inflation pipeline through the two-way switch valve to continuously supplement pressure, therefore, as the air source mechanism continuously supplements air to the second inflation pipeline, even if the air tightness of the air pressure element is poor, the pressure sensor can generate the condition that no pressure drop is generated or the pressure drop is slow.
The air circuit system in the prior art needs to detect the air tightness of the two-way switch valve before detecting the air pressure element to be detected due to the defects.
Disclosure of Invention
In view of the above technical problems in the prior art, embodiments of the present invention provide an air path system for detecting the air tightness of an air pressure element.
In order to solve the technical problem, the embodiment of the invention adopts the following technical scheme:
an air passage system for detecting airtightness of an air pressure element, comprising: the air source mechanism is connected to the two-way switch valve through a first inflation pipeline, the two-way switch valve is connected to the air pressure element through a second inflation pipeline, and the pressure sensor is used for checking the air pressure of the second inflation pipeline and further comprises a three-way switch valve;
the three-way switch valve is at least provided with an air inlet, an air outlet and a pressure relief opening, and the air inlet and the air outlet are connected to the first inflation pipeline; the three-way switching valve further has: a first state in which the air inlet is communicated with the air outlet and the air inlet, the air outlet and the pressure relief opening are all cut off; and a second state in which the air inlet, the air outlet and the pressure relief opening are cut off, and the pressure relief opening is communicated with the air outlet.
Preferably, the air supply mechanism comprises:
an air pump;
a gas tank, to which the gas pump is connected by means of a first connection line for inflating the gas tank;
the air tank is connected to the pressure reducing valve through a second connecting pipeline, and the pressure reducing valve is connected to the two-way switch valve through the first inflation pipeline.
Preferably, a relief valve is provided on the first connection line to limit the pressure of the first connection line.
Preferably, a pressure limiting switch is further disposed on the first connection pipeline, so that the first connection pipeline is limited within a certain pressure range.
Preferably, the two-way switch valve and the three-way switch valve are both pneumatic control valves;
a control pipeline is led out from the first connecting pipeline, and two electromagnetic directional valves respectively used for controlling the on-off states of the two-way switch valve and the three-way switch valve are arranged on the control pipeline.
Preferably, the pressure reducing valve is an electromagnetic proportional pressure reducing valve.
Compared with the prior art, the air path system for detecting the air tightness of the air pressure element has the advantages that:
the gas circuit system provided by the invention is not influenced by the good or bad air tightness of the two-way switch valve and the three-way switch valve when obtaining the judgment of better air tightness of the voltage element according to the pressure change characteristics of the pressure sensor, so that the air tightness of the two-way switch valve and the three-way switch valve is not required to be checked before detecting the gas pressure element.
Drawings
Fig. 1 is a schematic diagram of a gas circuit system for detecting the airtightness of a gas pressure element in the prior art.
Fig. 2 is a schematic diagram of an air path system for detecting the air tightness of an air pressure element according to an embodiment of the present invention.
In the figure:
11-an air pump; 12-a gas tank; 13-a pressure relief valve; 14-a first connecting line; 15-a second connecting line; 16-a safety valve; 17-a voltage limiting switch; 20-a two-way switching valve; 30-a pressure sensor; a 40-three-way switching valve; 51-a first inflation line; 52-second inflation line; 61-a first electromagnetic directional valve; 62-a second electromagnetic directional valve; 63-control lines; 1000-pneumatic element.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 2, an embodiment of the present invention discloses an air path system for detecting airtightness of an air pressure element 1000, the air path system including: the air supply mechanism, the pressure sensor 30, the two-way switch valve 20, the three-way switch valve 40, the first electromagnetic directional valve 61 and the second electromagnetic directional valve 62.
The gas source mechanism is used for providing pressure gas for the gas pressure element 1000 and related pipelines, and comprises: an air pump 11, an air tank 12, a pressure reducing valve 13, a safety valve 16 and a pressure limiting switch 17. The air outlet of the air pump 11 is connected to the air inlet of the air tank 12 via the first connecting line 14, so that the air pump 11 can inflate the air tank 12, and the air outlet of the air tank 12 is connected to the air inlet of the pressure reducing valve 13 via the second connecting line 15, so that the air can provide stable pressure air for the subsequent lines and the air pressure element 1000 after being reduced in pressure by the pressure reducing valve 13. In the present embodiment, an electromagnetic proportional pressure reducing valve 13 is used as the pressure reducing valve 13; a relief valve 16 is provided on the first connecting line 14 for preventing pressure fluctuations from causing an excessive pressure in the first connecting line 14, namely: when the pressure on the first connecting line 14 is too high, the pressure is instantaneously reduced by venting; the pressure limiting switch 17 is used to limit the pressure in the first connection line 14 to be maintained within a certain pressure range, so that the air pump 11 can more stably inflate the air tank 12.
The air control valve having two air control ports, one air inlet port and one air outlet port is selected as the two-way switching valve 20, so that the two-way switching valve 20 has a first state in which the air inlet port is communicated with the air outlet port thereof and a second state in which the air inlet port is blocked from the air outlet port thereof by selectively ventilating the two air control ports. The air outlet of the pressure reducing valve 13 is connected to the air inlet of the two-way switching valve 20 through a first inflation pipeline 51, and the air outlet of the two-way switching valve 20 is connected to the air inlet of the pneumatic element 1000 to be detected through a second inflation pipeline 52.
Selecting an air hole valve with two air control ports, an air inlet, an air outlet and a pressure relief port as the three-way switch valve 40, so that the two air control ports are selectively ventilated, the three-way switch valve 40 has a first state that the air inlet is communicated with the air outlet, and the air inlet, the air outlet and the pressure relief port are all cut off; and a second state in which the air inlet, the air outlet and the pressure relief opening are cut off and the pressure relief opening is communicated with the air outlet. The inlet and outlet of the three-way switch valve 40 are connected to a first inflation line 51.
A control line 63 leads out of the first connecting line 14, and the first electromagnetic directional valve 61 and the second electromagnetic directional valve 62 are connected in parallel to the control line 63. The first electromagnetic directional valve 61 selectively vents the control line 63 to the two pneumatic ports of the two-way switching valve 20 by electromagnetic directional to switch the two-way switching valve 20 between the first state and the second state; the second solenoid directional valve 62 selectively vents the control line 63 to the two pneumatic ports of the three-way switching valve 40 by solenoid directional to switch the three-way switching valve 40 between the first state and the second state.
The pressure sensor 30 is connected to the second inflation line 52 for sensing the gas pressure of that line.
When the gas pressure gauge is used, firstly, the two-way switch valve 20 is switched to a first state that the gas inlet and the gas outlet of the two-way switch valve 20 are communicated by the first electromagnetic directional valve 61, the three-way switch valve 40 is switched to a second state by the second electromagnetic directional valve 62, the gas tank 12 inflates the gas pressure element 1000 through the first inflation pipeline 51 and the second inflation pipeline 52, when the pressure sensor 30 detects that the pressure in the second inflation pipeline 52 rises to a rated detection pressure, the two-way switch valve is switched to the second state that the gas inlet and the gas outlet are cut off, then, the three-way switch valve 40 is switched to the second state, at this time, the gas between the three-way switch valve 40 and the two-way switch valve 20 is discharged from the pressure relief port through the gas outlet due to the second state that the three-way switch valve 40 is in the state that the gas outlet and the pressure relief port are communicated, and the gas provided by the gas tank. Waiting for a period of time, if the pressure sensor 30 generates no pressure drop or generates a pressure drop slowly, it indicates that the air tightness of the detected air pressure element 1000 is better.
Compared with the gas circuit system in the prior art, the gas circuit system provided by the invention has the advantages that:
the gas circuit system provided by the invention is not influenced by the air tightness of the two-way switch valve 20 and the air tightness of the three-way switch valve 40 when obtaining the judgment of better air tightness of the voltage element according to the pressure change characteristics of the pressure sensor 30, so that the air tightness of the two-way switch valve 20 and the three-way switch valve 40 is not required to be checked before detecting the air pressure element 1000. The reason for this is that:
when the air tightness of the air pressure element 1000 is detected, the three-way switch valve 40 is in the second state, at this time, the first inflation pipeline 51 located between the three-way switch valve 40 and the two-way switch valve 20 does not have pressure gas because the air outlet of the three-way switch valve 40 is communicated with the pressure relief opening, at this time, even if the air tightness of the two-way switch valve 20 is poor, the section of the first inflation pipeline 51 does not have the function of inflating the second inflation pipeline 52, that is, if the pressure sensor 30 has a condition that no pressure drop or a slow pressure drop is generated, the condition is caused by the fact that the air tightness of the air pressure element 1000 and the two-way switch valve 20 is good.
From the above analysis, it can be seen that the gas circuit system provided by the present invention can obtain the information of good air tightness of the two-way switching valve 20 when obtaining the judgment of good air tightness of the voltage element according to the pressure variation characteristics of the pressure sensor 30.
In the air tightness detection process, the reason why the air tightness of the three-way switching valve 40 does not affect the judgment of the result of good air tightness of the air pressure element 1000 is that: even if the three-way switching valve 40 is not airtight, the gas provided from the gas tank 12 is discharged through the pressure relief port of the three-way switching valve 40 by passing through the three-way switching valve 40 into the second inflation line 52 between the three-way switching valve 40 and the two-way switching valve 20.
The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.
Claims (6)
1. An air passage system for detecting airtightness of an air pressure element, comprising: the air source mechanism is connected to the two-way switch valve through a first inflation pipeline, the two-way switch valve is connected to the air pressure element through a second inflation pipeline, and the pressure sensor is used for checking the air pressure of the second inflation pipeline and is characterized by further comprising a three-way switch valve;
the three-way switch valve is at least provided with an air inlet, an air outlet and a pressure relief opening, and the air inlet and the air outlet are connected to the first inflation pipeline; the three-way switching valve further has: a first state in which the air inlet is communicated with the air outlet and the air inlet, the air outlet and the pressure relief opening are all cut off; and a second state in which the air inlet, the air outlet and the pressure relief opening are cut off, and the pressure relief opening is communicated with the air outlet.
2. The air passage system for detecting airtightness of an air pressure element according to claim 1, wherein the air supply mechanism includes:
an air pump;
a gas tank, to which the gas pump is connected by means of a first connection line for inflating the gas tank;
the air tank is connected to the pressure reducing valve through a second connecting pipeline, and the pressure reducing valve is connected to the two-way switch valve through the first inflation pipeline.
3. The air passage system for detecting airtightness of an air pressure element according to claim 2, wherein a safety valve is provided on the first connection pipe to limit a pressure of the first connection pipe.
4. The air passage system for detecting airtightness of an air pressure element according to claim 2, wherein a pressure limiting switch is further provided on the first connection pipe so that the first connection pipe is limited within a certain pressure range.
5. The air passage system for detecting the airtightness of the air pressure element according to claim 2, wherein the two-way switching valve and the three-way switching valve are both air control valves;
a control pipeline is led out from the first connecting pipeline, and two electromagnetic directional valves respectively used for controlling the on-off states of the two-way switch valve and the three-way switch valve are arranged on the control pipeline.
6. The air passage system for detecting airtightness of an air pressure element according to claim 2, wherein the pressure reducing valve is an electromagnetic proportional pressure reducing valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910826764.9A CN112444351A (en) | 2019-09-03 | 2019-09-03 | Gas path system for detecting air tightness of air pressure element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910826764.9A CN112444351A (en) | 2019-09-03 | 2019-09-03 | Gas path system for detecting air tightness of air pressure element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112444351A true CN112444351A (en) | 2021-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910826764.9A Pending CN112444351A (en) | 2019-09-03 | 2019-09-03 | Gas path system for detecting air tightness of air pressure element |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112444351A (en) |
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2019
- 2019-09-03 CN CN201910826764.9A patent/CN112444351A/en active Pending
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