Air path system for testing the air tightness of air pressure components

Abstract

The present invention discloses an air circuit system for detecting the air tightness of a pneumatic element, comprising: an air source mechanism, a two-way switch valve and a pressure sensor, wherein the air source mechanism is connected to the two-way switch valve via a first inflation pipeline, the two-way switch valve is connected to the pneumatic element via a second inflation pipeline, the pressure sensor is used to check the air pressure of the second inflation pipeline, and the air circuit system also comprises a three-way switch valve; the three-way switch valve has at least one air inlet, an air outlet and a pressure relief port, the air inlet and the air outlet are connected to the first inflation pipeline; the three-way switch valve also has: a first state in which the air inlet is connected to 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 port are all cut off, and the pressure relief port is connected to the air outlet.

Description

Technical Field

[0001] The invention relates to the technical field of testing equipment, and in particular to an air path system for detecting the air tightness of an air pressure element. Background Art

[0002] In the prior art, such as Figure 1 As shown, the air circuit system for checking the air tightness of a pneumatic component 600 such as a pneumatic valve generally includes: an air source mechanism 100, a two-way switch valve 200 and a pressure sensor 300. The air source mechanism 100 is connected to the two-way switch valve 200 via a first air charging pipeline 400, the two-way switch valve 200 is connected to the pneumatic component 600 via a second air charging pipeline 500, and the pressure sensor 300 is connected to the second air charging pipeline 500. When in use, first open the two-way switch valve, use the air source mechanism to inflate the pneumatic component, when the pressure of the second air charging pipeline reaches the detection pressure, close the two-way switch valve, then observe whether the pressure value of the pressure sensor changes, when the pressure sensor shows that the second air charging pipeline produces a faster pressure drop, it means that the air tightness of the pneumatic component being tested is poor, when the pressure sensor shows that the second air charging pipeline does not produce a pressure drop or produces a slow pressure drop, it means that the air tightness of the pneumatic component being tested is good.

[0003] The above-mentioned gas circuit system in the prior art has the following defects:

[0004] If the air tightness of the two-way switch valve is reduced for some reason, such as lifespan, damage, etc., when the pressure sensor does not produce a pressure drop or produces a pressure drop slowly, it cannot be said that the air tightness of the detected pneumatic component is good. The reason is that the pneumatic mechanism inevitably needs to continue to operate. Even when the two-way switch valve is closed, the pneumatic mechanism will continue to inflate the first inflation pipeline. This means 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 will enter the second inflation pipeline through the two-way switch valve to continuously replenish the pressure. Therefore, since the air source mechanism continuously replenishes gas to the second inflation pipeline, even if the air tightness of the pneumatic component is poor, the pressure sensor will not produce a pressure drop or produce a pressure drop slowly.

[0005] Due to the above-mentioned defects in the gas circuit system in the prior art, it is necessary to detect the air tightness of the two-way switch valve before detecting the air pressure component to be tested. Summary of the invention

[0006] In view of the above technical problems existing in the prior art, an embodiment of the present invention provides an air circuit system for detecting the air tightness of an air pressure element.

[0007] In order to solve the above technical problems, the technical solution adopted in the embodiments of the present invention is:

[0008] A gas circuit system for detecting the air tightness of a pneumatic component, comprising: an air source mechanism, a two-way switch valve and a pressure sensor, wherein the air source mechanism is connected to the two-way switch valve via a first air charging pipeline, the two-way switch valve is connected to the pneumatic component via a second air charging pipeline, the pressure sensor is used to check the air pressure of the second air charging pipeline, and further comprises a three-way switch valve;

[0009] The three-way switch valve has at least one air inlet, an air outlet and a pressure relief port, and the air inlet and the air outlet are connected to the first inflation pipeline; the three-way switch valve also has: a first state in which the air inlet is connected to 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 port are all cut off, and the pressure relief port is connected to the air outlet.

[0010] Preferably, the gas source mechanism comprises:

[0011] air pump;

[0012] A gas tank, wherein the air pump is connected to the gas tank via a first connecting pipeline for inflating the gas tank;

[0013] A pressure reducing valve, wherein the gas tank is connected to the pressure reducing valve via a second connecting pipeline, and the pressure reducing valve is connected to the two-way switch valve via the first inflation pipeline.

[0014] Preferably, a safety valve is provided on the first connecting pipeline to limit the pressure of the first connecting pipeline.

[0015] Preferably, a pressure limiting switch is also provided on the first connecting pipeline to limit the pressure of the first connecting pipeline to a certain range.

[0016] Preferably, the two-way switch valve and the three-way switch valve are both gas-controlled valves;

[0017] A control pipeline is led out from the first connecting pipeline, and the control pipeline is provided with two electromagnetic reversing valves for controlling the on-off states of the two-way switch valve and the three-way switch valve respectively.

[0018] Preferably, the pressure reducing valve is an electromagnetic proportional pressure reducing valve.

[0019] Compared with the prior art, the gas circuit system for detecting the air tightness of the gas pressure element of the present invention has the following beneficial effects:

[0020] When the air circuit system provided by the present invention obtains a good judgment on the air tightness of the voltage element based on the pressure change characteristics of the pressure sensor, it is not affected by the air tightness of the two-way switch valve or the three-way switch valve. Therefore, before detecting the air pressure element, it is not necessary to check the air tightness of the two-way switch valve and the three-way switch valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a gas circuit principle diagram of a gas circuit system for detecting the air tightness of a gas pressure element in the prior art.

[0022] Figure 2 An air circuit schematic diagram of an air circuit system for detecting the air tightness of an air pressure element provided in an embodiment of the present invention.

[0023] In the figure:

[0024] 11-air pump; 12-gas tank; 13-pressure reducing valve; 14-first connecting pipeline; 15-second connecting pipeline; 16-safety valve; 17-pressure limiting switch; 20-two-way switch valve; 30-pressure sensor; 40-three-way switch valve; 51-first charging pipeline; 52-second charging pipeline; 61-first solenoid reversing valve; 62-second solenoid reversing valve; 63-control pipeline; 1000-pneumatic element. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] like Figure 2 As shown, an embodiment of the present invention discloses an air circuit system for detecting the air tightness of a pneumatic element 1000 , the air circuit system comprising: an air source mechanism, a pressure sensor 30 , a two-way switch valve 20 and a three-way switch valve 40 , a first electromagnetic reversing valve 61 , and a second electromagnetic reversing valve 62 .

[0027] The gas source mechanism is used to provide pressurized gas for the pneumatic component 1000 and related pipelines, and the gas source mechanism includes: 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 a first connecting pipeline 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 a second connecting pipeline 15, so that the gas can provide stable pressure gas for the subsequent pipelines and the pneumatic component 1000 after being reduced in pressure by the pressure reducing valve 13. In this embodiment, an electromagnetic proportional pressure reducing valve 13 is selected as the above-mentioned pressure reducing valve 13; a safety valve 16 is installed on the first connecting pipeline 14 to prevent pressure fluctuations from causing excessive pressure on the first connecting pipeline 14, that is, when the pressure on the first connecting pipeline 14 is too high, the pressure is instantly reduced by exhausting the air; the pressure limiting switch 17 valve is used to limit the pressure in the first connecting pipeline 14 to remain within a certain pressure range, so that the air pump 11 can inflate the gas tank 12 more stably.

[0028] An air-controlled valve having two air-controlled ports, an air inlet and an air outlet is selected as the two-way switch valve 20, so that by selectively ventilating the two air-controlled ports, the two-way switch valve 20 has a first state in which its air inlet is connected to its air outlet and a second state in which its air inlet is cut off from its air outlet. The air outlet of the above-mentioned pressure reducing valve 13 is connected to the air inlet of the two-way switch valve 20 via the first air charging pipeline 51, and the air outlet of the two-way switch valve 20 is connected to the air inlet of the air pressure element 1000 to be detected via the second air charging pipeline 52.

[0029] An air hole valve having two air control ports, one air inlet, one air outlet, and one pressure relief port is selected as the three-way switch valve 40, so that air is selectively ventilated to the two air control ports, so that the three-way switch valve 40 has a first state in which the air inlet and the air outlet are connected, 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 port are all cut off, and the pressure relief port is connected to the air outlet. The air inlet and the air outlet of the three-way switch valve 40 are connected to the first inflation pipeline 51.

[0030] A control pipeline 63 is led out from the first connecting pipeline 14, and the first electromagnetic reversing valve 61 and the second electromagnetic reversing valve 62 are connected in parallel to the control pipeline 63. The first electromagnetic reversing valve 61 selectively vents the control pipeline 63 to the two air control ports of the two-way switch valve 20 through electromagnetic reversing to switch the two-way switch valve 20 between the first state and the second state; the second electromagnetic reversing valve 62 selectively vents the control pipeline 63 to the two air control ports of the three-way switch valve 40 through electromagnetic reversing to switch the three-way switch valve 40 between the first state and the second state.

[0031] The pressure sensor 30 is connected to the second gas charging pipeline 52 for detecting the gas pressure of the pipeline.

[0032] When in use, first, the two-way switch valve 20 is switched to the first state in which the first air inlet and the first air outlet of the two-way switch valve 20 are connected by the first electromagnetic reversing valve 61, and the three-way switch valve 40 is switched to the first state by the second electromagnetic reversing valve 62. The gas tank 12 inflates the pneumatic element 1000 through the first charging pipeline 51 and the second charging pipeline 52. When the pressure sensor 30 detects that the pressure in the second charging pipeline 52 rises to the rated detection pressure, the two-way switch valve is switched to the second state in which the first air inlet and the first air 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 air outlet because the three-way switch valve 40 is in the second state in which the air outlet and the pressure relief port are connected, and the gas provided by the gas tank 12 is cut off by the three-way switch valve 40. After waiting for a while, if the pressure sensor 30 does not generate a pressure drop or generates a pressure drop slowly, it means that the air tightness of the detected air pressure element 1000 is good.

[0033] The advantages of the gas circuit system provided by the present invention over the gas circuit system in the prior art are:

[0034] When the air circuit system provided by the present invention obtains the judgment that the air tightness of the voltage element is good according to the pressure change characteristics of the pressure sensor 30, it is not affected by the air tightness of the two-way switch valve 20, nor is it affected by the air tightness of the three-way switch valve 40. Therefore, before testing the air pressure element 1000, it is not necessary to perform air tightness inspection on the two-way switch valve 20 and the three-way switch valve 40. The reason is:

[0035] When the air tightness of the pneumatic element 1000 is detected, the three-way switch valve 40 is in the second state. At this time, there is no pressurized gas in the first inflation pipeline 51 between the three-way switch valve 40 and the two-way switch valve 20 because the air outlet of the three-way switch valve 40 is connected to the pressure relief port. At this time, even if the air tightness of the two-way switch valve 20 is poor, this section of the first inflation pipeline 51 will not have the function of inflating the second inflation pipeline 52. In other words, if the pressure sensor 30 does not generate a pressure drop or generates a pressure drop slowly, this is caused by the good air tightness of the pneumatic element 1000 and the two-way switch valve 20.

[0036] From the above analysis, it can be seen that the air circuit system provided by the present invention can obtain information that the air tightness of the two-way switch valve 20 is also good while obtaining the judgment that the air tightness of the voltage element is good according to the pressure change characteristics of the pressure sensor 30.

[0037] During the air tightness test, the air tightness of the three-way switch valve 40 will not affect the judgment that the air pressure element 1000 has good air tightness because: even if the air tightness of the three-way switch valve 40 is not good, the gas provided by the gas tank 12 passes through the three-way switch valve 40 and enters the second inflation pipeline 52 between the three-way switch valve 40 and the two-way switch valve 20, and the gas will also be discharged through the pressure relief port of the three-way switch valve 40.

[0038] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A gas circuit system for detecting the air tightness of a gas pressure element, comprising: An air source mechanism, a two-way switch valve and a pressure sensor, wherein the air source mechanism is connected to the two-way switch valve via a first air charging pipeline, the two-way switch valve is connected to the air pressure element via a second air charging pipeline, and the pressure sensor is used to check the air pressure of the second air charging pipeline, characterized in that it also includes a three-way switch valve; The three-way switch valve has at least one air inlet, an air outlet and a pressure relief port, and the air inlet and the air outlet are connected to the first inflation pipeline; the three-way switch valve also has: a first state in which the air inlet is connected to 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 port are all cut off and the pressure relief port is connected to the air outlet; The gas source mechanism comprises: air pump; A gas tank, wherein the air pump is connected to the gas tank via a first connecting pipeline for inflating the gas tank; A pressure reducing valve, the gas tank is connected to the pressure reducing valve via a second connecting pipeline, and the pressure reducing valve is connected to the two-way switch valve via the first charging pipeline; The two-way switch valve and the three-way switch valve are both gas-controlled valves; A control pipeline is led out from the first connecting pipeline, and the control pipeline has two electromagnetic reversing valves for controlling the on / off states of the two-way switch valve and the three-way switch valve respectively; The two-way switch valve has two air control ports, a first air inlet and a first air outlet, and the two-way switch valve has a first state that connects the first air inlet and the first air outlet and a second state that disconnects the first air inlet and the first air outlet; When in use, first, the two-way switch valve is switched to the first state in which the first air inlet and the first air outlet of the two-way switch valve are connected by the first electromagnetic reversing valve, and the three-way switch valve is switched to the first state by the second electromagnetic reversing valve. The gas tank inflates the pneumatic element through the first charging pipeline and the second charging pipeline. When the pressure sensor detects that the pressure in the second charging pipeline rises to the rated detection pressure, the two-way switch valve is switched to the second state in which the first air inlet and the first air outlet are cut off. Then, the three-way switch valve is switched to the second state. At this time, the gas between the three-way switch valve and the two-way switch valve is discharged from the pressure relief port through the air outlet because the three-way switch valve is in the second state in which the air outlet and the pressure relief port are connected, and the gas provided by the gas tank is cut off by the three-way switch valve.

2. The air circuit system for detecting the air tightness of an air pressure element according to claim 1, characterized in that: The first connecting pipeline is provided with a safety valve to limit the pressure of the first connecting pipeline.

3. The air circuit system for detecting the air tightness of an air pressure element according to claim 1, characterized in that: The first connecting pipeline is also provided with a pressure limiting switch so that the first connecting pipeline is limited to a certain pressure range.

4. The air circuit system for detecting the air tightness of an air pressure element according to claim 1, characterized in that: The pressure reducing valve is an electromagnetic proportional pressure reducing valve.

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