TW202403272A - Hermetic inspection system - Google Patents

Abstract

A hermetic inspection system for performing a hermetic inspection on a valve to be tested is disclosed. The valve includes a first side and a second side. The hermetic inspection system includes a compressed air source, a special gas source, and a special gas sensor. The compressed air source is configured to provide a compressed air. The special gas source is configured to provide a special air, and the composition of the special air is different from the main composition of the compressed air. The compressed air source and the special gas source are connected to the first side. The special gas sensor is connected to the second side and is configured to detect the concentration of the special gas.

Description

Air tightness detection system

The present invention relates to the detection of valve products, especially an air tightness detection system that uses special gases as detection objects.

Currently, the equipment used to detect valve products uses compressed air for simulation. In order to achieve a test pressure similar to the simulated environment, it sometimes needs to be as high as hundreds of Pascals (Bars), and the leakage pressure must be determined by an expensive gas-sensitive tester. Since the pressure-type interpretation method is used, it is necessary to wait for a period of time until the leakage pressure reaches a stable state before testing, and use the results to determine the tightness of the valve.

However, this conventional testing method has many shortcomings. First, due to the use of simulated fractional testing, when the single goal of the tested object is to determine the sealing, the detection system must use the same dangerous high-pressure container and high-pressure gas source environment. In addition to the industrial safety risks associated with high-voltage operations, equipment costs and maintenance costs are relatively high. Secondly, the method used in the conventional technology is to measure the leakage gas pressure after a period of time. However, it takes a period of time for the leakage to reach a reasonable resolution of pressure and wait for it to stabilize, which will only increase the labor cost. Finally, this conventional testing method requires the use of a gas-sensitive tester, and the gas-sensitive tester is an expensive instrument, so the price of the testing equipment will remain high.

In order to solve the problems existing in the prior art, the present invention proposes an air tightness detection system, which has low equipment construction cost, low operating cost, and fast detection speed.

The invention provides an air-tightness detection system for air-tightness detection of a valve component to be tested, wherein the valve component to be tested includes a first side and a second side. The air tightness detection system includes a compressed air source, a special gas source and a special gas sensor. The compressed air source is used to provide compressed air. The special gas source is used to provide a special air, and the composition of the special air is different from the main component of the compressed air. The compressed air source and the special gas source are connected to the first side. A special gas sensor is connected to the second side and used to detect the concentration of the special gas. .

In at least one embodiment, the air tightness detection system further includes an air inlet side connecting pipe, an air outlet side connecting pipe, a first opening and closing valve, a second opening and closing valve, a third opening and closing valve and a fourth opening and closing valve. On/off valve. The first side of the valve member to be tested is connected to the middle section of the intake side connecting pipe. The second side of the valve member to be tested is connected to the middle section of the gas outlet side connecting pipeline. The first opening and closing valve is connected to the inlet end of the air intake side connecting pipe, and the second opening and closing valve is connected to the outlet end of the air intake side connecting pipe. The third opening and closing valve is connected to the inlet end of the air outlet side connecting pipe, and the fourth opening and closing valve is connected to the outlet end of the air outlet side connecting pipe. The special gas sensor includes a first special gas sensor and a second special gas sensor; the first special gas sensor is disposed on the gas outlet side connecting pipe and is located between the second side and the between the fourth opening and closing valve; the second special gas sensor is arranged in the intake side connecting pipe and is located between the first side and the second opening and closing valve.

In at least one embodiment, the air tightness detection system further includes a gas mixer. The compressed air source and the special gas source are connected to the first opening and closing valve and the third opening and closing valve through the gas mixer, and are further connected to The inlet end of the air inlet side connecting pipe and the inlet end of the air outlet side connecting pipe.

In at least one embodiment, the special gas is a gas that is different from the main composition of the atmosphere.

In at least one embodiment, the special gas is carbon dioxide, carbon monoxide, helium, or a vapor formed by volatilization of a volatile substance.

In at least one embodiment, the air tightness detection system further includes a sealing fixture, which has a chamber that matches the shape of the valve component to be tested and is used to cover the valve component to be tested and seal it. seal.

In at least one embodiment, the air inlet side connecting pipe and the air outlet side connecting pipe are pipes partially buried in the sealing fixture, and their connection ports correspond to the first side and the second side.

In at least one embodiment, the sealing jig includes an upper jig and a lower jig. The upper jig and the lower jig each have half a cavity for combining to form the cavity, and the air inlet side is connected The pipeline connecting the pipeline and the air outlet side is partially buried in the lower fixture.

In at least one embodiment, during a positive pressure test, the second on-off valve and the third on-off valve are closed, while the first on-off valve and the fourth on-off valve are open.

In at least one embodiment, during a negative pressure test, the first opening and closing valve and the fourth opening and closing valve are closed, while the second opening and closing valve and the third opening and closing valve are open.

By using special gases as detection objects/markers, the present invention effectively reduces the equipment cost of detection valve products and improves detection efficiency.

Please refer to FIG. 1 and FIG. 2 , which are schematic structural diagrams of an embodiment of the air tightness detection system 1 of the present invention. As shown in FIG. 1 , the valve component 30 to be tested is placed in the air tightness detection system 1 . The valve member 30 to be tested includes an air inlet side 31 and an air outlet side 32 . Based on the different uses of the valve component 30 to be tested, such as a check valve, the air tightness (pressure difference without air leakage) from the air inlet side 31 to the air outlet side 32 is not equal to the air tightness from the air outlet side 32 to the air inlet side 31 . The invention can provide positive pressure testing and reverse pressure testing to test the air tightness in both directions.

As shown in Figures 1 and 2, the air tightness detection system 1 includes an air inlet side connecting pipe 11, an air outlet side connecting pipe 12, a first opening and closing valve 131, a second opening and closing valve 132, and a third opening and closing valve. Valve 133, a fourth on-off valve 134, a compressed air source 14, a special gas source 15, a first special gas sensor 161 and a second special gas sensor 162.

As shown in FIGS. 1 and 2 , the air inlet side 31 of the valve member 30 to be tested is connected to the middle section of the air inlet side connecting pipe 11 , and the air outlet side 32 of the valve member 30 to be measured is connected to the outlet side connecting pipe 12 . middle section. The first opening and closing valve 131 is connected to the inlet end of the intake side connecting pipe 11 , and the second opening and closing valve 132 is connected to the outlet end of the intake side connecting pipe 11 . The third opening and closing valve 133 is connected to the inlet end of the gas outlet connection pipe 12 , and the fourth opening and closing valve 134 is connected to the outlet end of the gas outlet side connection pipe 12 .

As shown in FIGS. 1 and 2 , the compressed air source 14 and the special gas source 15 are connected to the first on-off valve 131 and the third on-off valve 133 through a gas mixer 17 , and then connected to the inlet of the intake side connecting pipe 11 The inlet end of the pipeline 12 is connected to the air outlet side.

The air tightness detection system 1 of the present invention mainly consists of dual gas sources, namely a compressed air source 14 and a special gas source 15.

The compressed air source 14 is used to provide compressed air. Compressed air is easy to obtain and low-cost. At the same time, the composition of the atmosphere is fixed (mainly composed of a fixed proportion of oxygen and nitrogen), and it is easy to distinguish it from special gases. For example, an air compressor can be set up directly in the test site, and atmospheric air can be captured directly through the filter and compressed to produce compressed air. In fact, the compressed air source 14 may be the air storage tank of the air compressor.

The special gas source 15 is used to provide special gas. Special gases are gases that are different from the main components of the atmosphere, or gases with low content (concentration) in the atmosphere. Special gases are used as leak detection objects/detection markers. That is, it only detects the content (concentration) of special gases without detecting pressure changes or components in compressed air. Special gases can be gases that are low in the atmosphere and easy to detect. For example, the content of carbon dioxide in the atmosphere is usually not too high, and the acquisition cost is low; at the same time, the equipment cost of carbon dioxide detectors is relatively low, so carbon dioxide can be used as a special gas. The selection of special gases is mainly to exclude the main components of the atmosphere: nitrogen and oxygen. Therefore, the special gas can be carbon dioxide, carbon monoxide or helium, etc. As mentioned before, carbon dioxide is most suitable as a special gas due to its low cost and low sensor cost, but other gases are not excluded. In possible embodiments, the special gas may be provided by a volatile substance. For example, the special gas is alcohol vapor formed by volatilization of alcohol, and the special gas source 15 is provided with, for example, an evaporator or a heater to volatilize and generate the special gas.

The gas mixer 17 is used to mix compressed air and special gas in an appropriate quantitative ratio to generate mixed gas. For example, when carbon dioxide is used as a special gas, the carbon dioxide content in the normal atmosphere can be used as a basis, a carbon dioxide concentration higher than the aforementioned content can be set, and the compressed air and carbon dioxide can be mixed.

As shown in FIGS. 1 and 2 , the first special gas sensor 161 is provided on the gas outlet side connecting pipe 12 and is located between the gas outlet side 32 and the fourth on-off valve 134 . The second special gas sensor 162 is provided in the intake side connecting pipe 11 and is located between the intake side 31 and the second on-off valve 132 .

As shown in FIGS. 1 and 2 , the first special gas sensor 161 and the second special gas sensor 162 are used to sense the special gas concentration in the mixed gas. The data transmission unit 18 connected to the first special gas sensor 161 and the second special gas sensor 162 can transmit the special gas concentration to the host through wired or wireless means, and monitor the concentration changes in real time. Through the special gas concentration changes, The sealing ability of the valve member 30 to be tested is estimated.

As shown in Figures 1 and 2, the valve component 30 to be tested can be sealed by clamping and quickly connected to the test pipeline. In a specific embodiment, the air tightness detection system 1 further includes a sealing fixture 19 . The sealing fixture 19 has a cavity that matches the outer shape of the valve component 30 to be tested, and is used to cover and seal the valve component 30 to be tested. The air inlet side connecting pipe 11 and the air outlet side connecting pipe 12 may be pipes partially buried in the sealing fixture 19 , and the connection ports correspond to the air inlet side 31 and the air outlet side 32 of the valve member 30 to be tested. Therefore, when the valve member 30 to be tested is sealed in the sealing fixture 19, the air inlet side 31 and the air outlet side 32 can also be connected to the corresponding air inlet side connecting pipe 11 and the air outlet side connecting pipe 12 at the same time.

As shown in FIGS. 1 and 2 , the sealing jig 19 includes an upper jig 191 and a lower jig 192 . The upper jig 191 and the lower jig 192 respectively have half chambers 193 and 194 for combination to form the above-mentioned chambers. The lower half of the valve member 30 to be tested can be first placed into the half chamber 194 of the lower jig 192, and then the upper jig 191 is combined with the lower jig 192, so that the sealing jig 19 covers the valve member 30 to be tested and Be sealed. The aforementioned air inlet side connecting pipe 11 and air outlet side connecting pipe 12 can be partially buried in the lower fixture 192 according to the position of the inlet side 31 and the air outlet side 32 of the valve member 30 to be tested. In this way, the sealing fixture 19 can quickly replace the valve member 30 to be tested, thereby facilitating the testing operation. It should be noted that the upper jig 191 and the lower jig 192 in Figure 2 omit the drawing of cross-section lines to facilitate the presentation of the components and component numbers. In fact, the upper jig 191 and the lower jig shown in Figure 2 Tool 192 is still the same cross-section.

As shown in Figures 3 and 4, the present invention can provide positive pressure testing and reverse pressure testing to test the air tightness in both directions. The compressed air and special gas from the dual gas sources are respectively introduced into the gas mixer 17 through pipelines. The gas mixer 17 mixes the two gases in a quantitative manner. The mixing ratio is related to the following three points: 1. Type of product being tested; 2. Measurement pressure; 3. Measurement time. After mixing, the compressed gas will be introduced into the valve 30 to be tested through the detection pipeline. Depending on the difference between the positive pressure test and the reverse pressure test, the gas paths A and B are also different.

As shown in Figure 3, the positive pressure test process is carried out. During the positive pressure test, the second on-off valve 132 and the third on-off valve 133 are closed, while the first on-off valve 131 and the fourth on-off valve 134 are open. At this time, the gas path A is connected from the gas mixer 17 to the gas inlet side 31 of the valve member 30 to be tested, and then connected to the gas outlet side 32 of the valve member 30 to be tested to the opened fourth opening and closing valve 134, and then connected to the gas outlet. The side is connected to the outlet end of pipeline 12. By opening the first opening and closing valve 131 , the gas mixer 17 delivers the mixed gas to the air inlet side 31 of the valve member 30 to be tested. At this time, if the valve member 30 to be tested leaks, the first special gas sensor 161 can sense the special gas. At this time, as long as the data transmission unit 18 records the pressure of the mixed gas delivered by the gas mixer 17 at the same time, the positive pressure sealing capability of the valve 30 to be tested can be obtained.

As shown in Figure 4, the negative pressure test process is carried out. The negative pressure sealing capability of the valve member 30 to be tested may be better than the positive pressure sealing capability. For example, the negative pressure sealing capacity of a check valve will be higher than the positive pressure sealing capacity. In order to avoid that the pressure of the mixed gas is insufficient to cause the valve member 30 to be tested to leak during the negative pressure test, the air tightness testing system 1 of the present invention further includes a vacuum pump 20 connected to the air inlet side connecting pipe through a second opening and closing valve 132 The outlet end of 11 is used to evacuate the outlet end of pipeline 11 on the intake side to provide negative pressure.

As shown in FIG. 4 , during the negative pressure test, the first on-off valve 131 and the fourth on-off valve 134 are closed, while the second on-off valve 132 and the third on-off valve 133 are open. At this time, the gas path B is connected from the gas mixer 17 to the gas outlet side 32 of the valve member 30 to be tested, and then connected to the gas inlet side 31 of the valve member 30 to be tested to open the second opening and closing valve 132, and then connected to the gas inlet side. The outlet end of the side connection pipeline 11 is finally connected to the vacuum pump 20 . By opening the third opening and closing valve 133 , the gas mixer 17 delivers the mixed gas to the outlet side 32 of the valve member 30 to be tested, and the vacuum pump 20 pumps air to increase the pressure difference from the outlet side 32 to the inlet side 31 . At this time, if the valve member 30 to be tested leaks, the second special gas sensor 162 can sense the special gas. At this time, as long as the data transmission unit 18 simultaneously records the pressure of the mixed gas delivered by the gas mixer 17 plus the additional pressure difference provided by the vacuum pump 20, the negative pressure sealing capability of the valve 30 to be tested can be obtained.

Based on the above technical means, the technical means of the embodiment of the air tightness detection system 1 of the present invention can be summarized as follows. The valve member 30 to be tested includes a first side and a second side. The configuration of the first side and the second side may be such that the first side is the air inlet side 31 and the second side is the air outlet side 32 . Alternatively, the first side is the air outlet side 32 and the second side is the air inlet side 31 . The air tightness detection system 1 includes a compressed air source 14 and a special gas source 15 connected to the first side through a gas mixer 17 and an opening and closing valve, and a special gas sensor is connected to the second side. valve, the mixed gas is delivered to the first side. By detecting the concentration of special gas through a special gas sensor, the air-tightness effect from the first side to the second side can be detected. When the pressure difference between the first side and the second side needs to be increased additionally, the second side can be further connected to a vacuum pump that provides negative pressure.

By using special gases as detection objects/markers, the present invention effectively reduces the equipment cost of detection valve products and improves detection efficiency.

The above is only one of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. That is, all changes in shape, structure, characteristics and spirit described in the patent scope of the present invention may be equal to those described above. Modifications should be included in the patentable scope of the present invention.

1: Air tightness detection system 11: Inlet side connecting pipe 12: Outlet side connecting pipe 131: First opening and closing valve 132: Second opening and closing valve 133: The third opening and closing valve 134: The fourth opening and closing valve 14:Compressed air source 15:Special gas source 161: The first special gas sensor 162: The second special gas sensor 17:Gas mixer 18: Data transmission unit 19:Sealing fixture 191: Upper fixture 192:Lower jig 193, 194: half chamber 20: Vacuum pump 30: Valve parts to be tested 31: Intake side 32: Outlet side A: Gas path B: Gas path

[Fig. 1] is a cross-sectional exploded view of the air tightness detection system in the embodiment of the present invention.

[Fig. 2] is a cross-sectional view of the air tightness detection system in the embodiment of the present invention.

[Fig. 3] is a cross-sectional view of the air tightness detection system in the embodiment of the present invention, revealing the gas path.

[Fig. 4] is a cross-sectional view of the air tightness detection system in the embodiment of the present invention, revealing another gas path.

1: Air tightness detection system

11: Inlet side connecting pipe

12: Outlet side connecting pipe

131: First opening and closing valve

132: Second opening and closing valve

133: The third opening and closing valve

134: The fourth opening and closing valve

14:Compressed air source

15:Special gas source

161: The first special gas sensor

162: The second special gas sensor

17:Gas mixer

18: Data transmission unit

19:Sealing fixture

20: Vacuum pump

30: Valve parts to be tested

31: Intake side

32: Outlet side

Claims (10)

An air tightness detection system is used to perform air tightness detection on a valve component to be tested, wherein the valve component to be tested includes a first side and a second side; the air tightness detection system includes: a compressed air source for providing compressed air; A special gas source is used to provide a special air, and the composition of the special air is different from the main component of the compressed air; wherein the compressed air source and the special gas source are connected to the first side; and A special gas sensor is connected to the second side and used to detect the concentration of the special gas. The air tightness detection system as described in claim 1 further includes: An air inlet side connecting pipe, the first side of the valve member to be tested is connected to the middle section of the air inlet side connecting pipe; An air outlet side connecting pipe, the second side of the valve member to be tested is connected to the middle section of the air outlet side connecting pipe; A first opening and closing valve and a second opening and closing valve, the first opening and closing valve is connected to the inlet end of the air inlet side connecting pipe, and the second opening and closing valve is connected to the outlet end of the air inlet side connecting pipe; A third opening and closing valve and a fourth opening and closing valve, the third opening and closing valve is connected to the inlet end of the gas outlet side connecting pipe, and the fourth opening and closing valve is connected to the outlet end of the gas outlet side connecting pipe; Wherein, the special gas sensor includes a first special gas sensor and a second special gas sensor; the first special gas sensor is arranged on the gas outlet side connecting pipe and is located on the second side and the fourth on-off valve; the second special gas sensor is provided on the intake side connecting pipe and is located between the first side and the second on-off valve. The air tightness detection system according to claim 2 further includes a gas mixer. The compressed air source and the special gas source are connected to the first on-off valve and the third on-off valve through the gas mixer, and then connected to the inlet end of the air inlet side connecting pipe and the inlet end of the air outlet side connecting pipe. The air tightness detection system as claimed in claim 2, wherein the special gas is a gas different from the main composition of the atmosphere. The air tightness detection system as claimed in claim 4, wherein the special gas is carbon dioxide, carbon monoxide, helium, or a vapor formed by the volatilization of a volatile substance. The air tightness testing system according to claim 2 further includes a sealing fixture, the sealing fixture has a chamber matching the shape of the valve component to be tested, and is used to cover the valve component to be tested and Be sealed. The air tightness detection system as claimed in claim 6, wherein the air inlet side connecting pipe and the air outlet side connecting pipe are pipes partially buried in the sealing fixture, and their connection ports correspond to the third one side with that second side. The air tightness detection system as claimed in claim 7, wherein the sealing jig includes an upper jig and a lower jig, and the upper jig and the lower jig each have half a cavity for combining to form the cavity. chamber, and the air inlet side connecting pipe and the air outlet side connecting pipe are partially buried in the lower fixture. The air tightness testing system of claim 2, wherein during a positive pressure test, the second opening and closing valve and the third opening and closing valve are closed, and the first opening and closing valve and the fourth opening and closing valve are open. The air tightness testing system of claim 2, wherein during a negative pressure test, the first opening and closing valve and the fourth opening and closing valve are closed, while the second opening and closing valve and the third opening and closing valve are open.

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