Gas valve airtightness detection test device and test method

Abstract

The invention discloses a gas valve airtightness detection test device and test method, the device comprises a casing, a rubber sample, a metal sample, a piston rod, a pressure supply system, a gas supply system and a suction head, the casing is provided with a mounting groove distributed in the vertical direction and a detection through hole communicated with the mounting groove and distributed transversely; a rubber sample is placed in the mounting groove; the metal sample is in sliding connection with the mounting groove and is located at the top of the rubber sample, so that a sealed test cavity and a gas leakage channel are formed between the metal sample and the rubber sample, and the gas leakage channel corresponds to the detection through hole in position; the piston rod is located at the top of the metal sample and detachably connected with the metal sample; the pressure supply system is connected with the piston rod top; the air supply system is detachably connected with the piston rod and is communicated with the sealing test cavity through an internal channel of the piston rod and a ventilation through hole of the metal sample; and the suction head is connected and communicated with the gas mass spectrometer through a pipeline and extends into the detection through hole. According to the invention, various parameters influencing the sealing effect can be comprehensively tested.

Description

Technical Field

[0001] The present invention relates to the technical field of air tightness detection, and more particularly to an air tightness detection device and a test method for a gas valve. Background Art

[0002] For gas valves, especially hydrogen valves, there are many factors that affect their airtightness, and sealing is very difficult. For example, the material and shape of the sealing ring, the roughness of the metal surface, the surface processing method, the friction and pressure between the sealing ring and the metal surface, etc. will all affect the sealing performance. In the existing technology, such as static sealing tests and dynamic sealing tests, the valve is usually assembled before studying the impact of different influencing factors on the sealing performance. This not only makes readjustment and assembly very cumbersome, but also requires high time and material processing costs. In other words, the existing technology has always lacked a test device specifically for hydrogen valve sealing performance testing.

[0003] Therefore, providing a gas valve air tightness detection device and test method is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the present invention provides a gas valve air tightness detection device and test method, which can test the sealing performance of hydrogen valves simply, quickly and at low cost.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A gas valve air tightness detection test device, comprising:

[0007] A housing having a vertically distributed mounting groove and a laterally distributed detection through-hole communicating with the mounting groove;

[0008] a rubber sample, the rubber sample being placed in the mounting groove;

[0009] a metal sample, the metal sample being slidably connected to the mounting groove and being located on top of the rubber sample to form a sealed test cavity and a gas leakage channel between the metal sample and the rubber sample, wherein the position of the gas leakage channel corresponds to the detection through hole;

[0010] a piston rod, the piston rod being located on top of the metal specimen and being detachably connected thereto;

[0011] a pressure supply system connected to the top of the piston rod;

[0012] an air supply system, the air supply system being detachably connected to the piston rod and communicating with the sealed test chamber through an internal passage of the piston rod and a vent hole of the metal specimen;

[0013] The suction head is connected to the gas mass spectrometer through a pipeline, and the suction head extends into the detection through hole.

[0014] By adopting the above technical solution, the beneficial effects of the present invention are:

[0015] It is convenient to replace rubber specimens and / or metal specimens with different parameters, realize individual or combined adjustment, adjust the pressure load parameters between rubber specimens and metal specimens, and adjust different gas pressures. The flexible structure realizes modular testing and can carry out comprehensive testing of various parameters that affect the sealing effect.

[0016] Furthermore, a test slot is provided in the center of the top of the rubber specimen; a boss corresponding to the position of the test slot is provided in the center of the bottom of the metal specimen, and the size of the boss is larger than the test slot. When the boss is pressed against the upper surface of the metal specimen, the sealed test cavity is formed between the boss and the test slot, and the gas leakage channel is formed between the lower surface of the main body of the metal specimen and the upper surface of the main body of the rubber specimen.

[0017] Furthermore, a first threaded hole is provided at the center of the top of the metal sample; a threaded shaft is provided at the bottom of the piston rod, and the threaded shaft is threadedly connected to the first threaded hole.

[0018] Furthermore, the air supply system includes an air source, a control valve, a booster pump, an air pipe, an air compressor and a pressure gauge, and the air source, the control valve, the booster pump and the air pipe are connected and communicated with each other in sequence; the piston rod has a second threaded hole; the extended end of the air pipe is threadedly connected to the second threaded hole, and the air pipe is communicated with the internal channel; the air compressor is connected and communicated with the booster pump; and the pressure gauge is installed on the air pipe.

[0019] Furthermore, a U-shaped sealing ring is installed between the metal sample and the mounting groove; and an O-shaped sealing ring is installed between the piston rod and the metal sample.

[0020] Furthermore, the outer circumferential surface of the metal sample has a guide belt installation groove, and a guide belt is installed in the guide belt installation groove.

[0021] A gas valve air tightness detection test method is performed using the gas valve air tightness detection test device described above, comprising the following steps:

[0022] 1) Test preparation: Determine the material, surface roughness, surface processing method, sealing channel length, and pressure load parameters between the rubber and metal specimens to be tested, and determine the gas pressure value during ventilation measurement;

[0023] 2) Assembly: Place the rubber sample in the mounting groove, press the metal sample into the mounting groove, connect the piston rod to the threaded end of the metal sample, thread the extended end of the air pipe to the second threaded hole, connect the pressure supply system to the piston rod, and place the suction head in the detection through hole;

[0024] 3) Air tightness test: The pressure supply system applies downward pressure to the piston rod, creating a pressure load between the rubber sample and the metal sample surface. The air supply system fills the piston rod with pressurized gas, which enters the test tank through the internal channel and the vent hole in turn. The boss blocks the pressurized gas, and the leaked gas enters the gas leakage channel and is adsorbed by the suction head into the gas mass spectrometer. The gas leakage volume is obtained to evaluate its sealing performance.

[0025] By adopting the above technical solution, the beneficial effects of the present invention are:

[0026] The operation is simple and the testing time is short, thus avoiding the problems of complicated adjustment and assembly as well as high time and material processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0028] Figure 1 The accompanying drawing is a schematic structural diagram of a gas valve air tightness detection test device provided by the present invention;

[0029] Figure 2 The accompanying drawing is a schematic diagram of the three-dimensional structure of the main body of a gas valve air tightness detection test device provided by the present invention;

[0030] Figure 3 The attached picture is Figure 1 Schematic diagram of the enlarged structure of part A;

[0031] Figure 4 The accompanying drawing is a cross-sectional view of the housing provided by the present invention;

[0032] Figure 5 The accompanying drawing is a stereogram of a rubber sample provided by the present invention;

[0033] Figure 6 The accompanying drawing is a perspective view of a metal sample provided by the present invention;

[0034] Figure 7The accompanying drawing is a cross-sectional view of a metal sample provided by the present invention;

[0035] Figure 8 The accompanying drawing is a cross-sectional view of the piston rod provided by the present invention. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] like Figure 1-8 As shown, the embodiment of the present invention discloses a gas valve air tightness detection test device, including a housing 1, a rubber sample 2, a metal sample 3, a piston rod 4, a pressure supply system 5, an air supply system 6 and a suction head 7. The housing 1 has a vertically distributed mounting groove 11 and a horizontally distributed detection through hole 12 connected to the mounting groove 11; the rubber sample 2 is placed in the mounting groove 11, and the rubber sample 2 is cylindrical; the metal sample 3 is slidably connected to the mounting groove 11 (clearance fit) and is located on the top of the rubber sample 2, so that the metal sample 3 and the rubber sample are in contact. 2, a sealed test chamber and a gas leakage channel are formed between the rubber sample 2 and the metal sample 3, and the position of the gas leakage channel corresponds to the detection through hole 12; the piston rod 4 is located at the top of the metal sample 3 and is detachably connected thereto; the pressure supply system 5 is connected to the top of the piston rod 4; the gas supply system 6 is detachably connected to the piston rod 4 and is connected to the sealed test chamber through the internal channel 43 of the piston rod 4 (the interconnected transverse vent and longitudinal vent) and the ventilation through hole 33 of the metal sample 3; the suction head 7 is connected to the gas mass spectrometer 8 through a pipeline, and the suction head 7 extends into the detection through hole 12. The present invention facilitates the replacement of rubber samples 2 and / or metal samples 3 with different parameters, and realizes individual or combined adjustment, facilitates the adjustment of the pressure load parameters between the rubber sample 2 and the metal sample 3, and facilitates the adjustment of different gas pressures. It has a flexible structure and realizes modular testing, and can carry out comprehensive testing of various parameters that affect the sealing effect (sample material, sealing channel length, metal surface roughness, surface processing method, pressure load parameters between the two sample surfaces, and hydrogen pressure).

[0038] Specifically, a test slot 21 is provided in the center of the top of the rubber sample 2; a boss 31 corresponding to the position of the test slot 21 is provided in the center of the bottom of the metal sample 3. The size of the boss 31 is larger than the test slot 21. When the boss 31 is pressed against the upper surface of the metal sample 3, a sealed test cavity is formed between the boss 31 and the test slot 21, and a gas leakage channel is formed between the lower surface of the main body of the metal sample 3 and the upper surface of the main body of the rubber sample 2.

[0039] Specifically, a first threaded hole 32 is provided at the center of the top of the metal sample 3 ; a threaded shaft 41 is provided at the bottom of the piston rod 4 , and the threaded shaft 41 is threadedly connected to the first threaded hole 32 .

[0040] Specifically, the air supply system 6 includes an air source 61, a control valve 62, a booster pump 63, an air pipe 64, an air compressor 65 and a pressure gauge 66. The air source 61, the control valve 62, the booster pump 63 and the air pipe 64 are connected and communicated with each other in sequence; the piston rod 4 has a second threaded hole 42; the extended end of the air pipe 64 is threadedly connected to the second threaded hole 42, and the air pipe 64 is communicated with the internal channel 43; the air compressor 65 is connected and communicated with the booster pump 63; and the pressure gauge 66 is installed on the air pipe 64.

[0041] Specifically, a U-shaped sealing ring 9 is installed between the metal sample 3 and the mounting groove 11. In this embodiment, a sealing ring mounting groove is opened on the metal sample 3, and the U-shaped sealing ring 9 is installed in the sealing ring mounting groove; an O-shaped sealing ring 10 is installed between the piston rod 4 and the metal sample 3. In this embodiment, a sealing ring mounting groove is opened on the piston rod 4, and the O-shaped sealing ring 10 is installed in the sealing ring mounting groove.

[0042] Specifically, the outer circumferential surface of the metal sample 3 has a guide belt installation groove 34 , and the guide belt 101 is installed in the guide belt installation groove 34 .

[0043] The embodiment of the present invention further discloses a gas valve air tightness detection test method, which is performed using the gas valve air tightness detection test device described above and includes the following steps:

[0044] 1) Test preparation: Determine the material, surface roughness, surface processing method, sealing channel length, and pressure load parameters between the rubber sample 2 and the metal sample 3 to be tested, and determine the gas pressure value during ventilation measurement;

[0045] 2) Assembly: Place the rubber sample 2 in the mounting groove 11. The material of the rubber sample 2 can be adjusted according to the test requirements to test its air tightness; Press the metal sample 3 into the mounting groove 11. By replacing different metal samples 3, the material, surface roughness, surface processing method and sealing channel length of the metal sample 3 can be adjusted to test its air tightness; Thread the piston rod 4 to the metal sample 3, and thread the extended end of the air pipe 64 to the second threaded hole 42. The air intake pressure can be adjusted according to the test requirements to test its air tightness; Connect the pressure supply system 5 to the piston rod 4. The applied pressure can be adjusted according to the test requirements, thereby changing the pressure load parameters between the rubber sample 2 and the metal sample 3 to test its air tightness; Place the suction head 7 in the detection through hole 12;

[0046] 3) Air tightness test: The pressure supply system 5 applies downward pressure to the piston rod 4, creating a pressure load between the surfaces of the rubber sample 2 and the metal sample 3. The air supply system 6 fills the piston rod 4 with pressurized gas, which enters the test tank 21 through the internal channel 43 and the vent hole 33 in sequence. The boss 31 blocks the pressurized gas, and the leaked gas enters the gas leakage channel and is adsorbed by the suction head 7 into the gas mass spectrometer 8. The gas leakage amount is obtained and used to evaluate its sealing performance.

[0047] The present invention is easy to operate and takes a short time for testing, thus avoiding the problems of complicated adjustment and assembly as well as high time and material processing costs.

[0048] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0049] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gas valve air tightness detection test device, characterized in that: include: A housing having a vertically distributed mounting groove and a laterally distributed detection through-hole communicating with the mounting groove; a rubber sample, the rubber sample being placed in the mounting groove; a metal sample, the metal sample being slidably connected to the mounting groove and being located on top of the rubber sample to form a sealed test cavity and a gas leakage channel between the metal sample and the rubber sample, wherein the position of the gas leakage channel corresponds to the detection through hole; a piston rod, the piston rod being located on top of the metal specimen and being detachably connected thereto; a pressure supply system connected to the top of the piston rod; an air supply system, the air supply system being detachably connected to the piston rod and communicating with the sealed test chamber through an internal passage of the piston rod and a vent hole of the metal specimen; The suction head is connected to the gas mass spectrometer through a pipeline, and the suction head extends into the detection through hole.

2. A gas valve air tightness detection test device according to claim 1, characterized in that: A test slot is provided at the center of the top of the rubber specimen; a boss corresponding to the position of the test slot is provided at the center of the bottom of the metal specimen, and the size of the boss is larger than the test slot. When the boss is pressed against the upper surface of the metal specimen, the sealed test cavity is formed between the boss and the test slot, and the gas leakage channel is formed between the lower surface of the main body of the metal specimen and the upper surface of the main body of the rubber specimen.

3. A gas valve air tightness detection test device according to claim 1, characterized in that: A first threaded hole is provided at the center of the top of the metal sample; a threaded shaft is provided at the bottom of the piston rod, and the threaded shaft is threadedly connected to the first threaded hole.

4. A gas valve air tightness detection test device according to claim 1 or 2, characterized in that: The air supply system includes an air source, a control valve, a booster pump, an air pipe, an air compressor and a pressure gauge, wherein the air source, the control valve, the booster pump and the air pipe are connected and communicated with each other in sequence; the piston rod has a second threaded hole; the extended end of the air pipe is threadedly connected to the second threaded hole, and the air pipe is communicated with the internal channel; the air compressor is connected and communicated with the booster pump; and the pressure gauge is installed on the air pipe.

5. A gas valve air tightness detection test device according to claim 4, characterized in that: A U-shaped sealing ring is installed between the metal sample and the mounting groove; and an O-shaped sealing ring is installed between the piston rod and the metal sample.

6. A gas valve air tightness detection test device according to claim 1, characterized in that: The outer circumferential side surface of the metal sample is provided with a guide belt installation groove, and a guide belt is installed in the guide belt installation groove.

7. A gas valve air tightness detection test method, performed using a gas valve air tightness detection test device according to any one of claims 1 to 6, characterized in that: The following steps are involved: 1) Test preparation: Determine the material, surface roughness, surface processing method, sealing channel length, and pressure load parameters between the rubber and metal specimens to be tested, and determine the gas pressure value during ventilation measurement; 2) Assembly: Place the rubber sample in the mounting groove, press the metal sample into the mounting groove, connect the piston rod to the thread of the metal sample, thread the extended end of the air pipe to the second threaded hole, connect the pressure supply system to the piston rod, and place the suction head in the detection through hole; 3) Air tightness test: The pressure supply system applies downward pressure to the piston rod, creating a pressure load between the rubber sample and the metal sample surface. The air supply system fills the piston rod with pressurized gas, which enters the test tank through the internal channel and the vent hole in turn. The boss blocks the pressurized gas, and the leaked gas enters the gas leakage channel and is adsorbed by the suction head into the gas mass spectrometer. The gas leakage volume is obtained to evaluate its sealing performance.

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