Detection device for oxygen aging resistance test of rubber sealing element

Abstract

The utility model belongs to the technical field of test devices, and particularly relates to a detection device for an oxygen aging resistance test of a rubber sealing element. Comprising an air pressure control device and a temperature control device. The air pressure control device comprises an oxygen bottle head, a sealing plate and a plug; the sealing plate is fixedly connected to the bottom of the oxygen cylinder head; the plug is detachably connected to the sealing plate in a sealed mode, the oxygen bottle head, the sealing plate and the plug form a closed space used for oxygenation, and the rubber sealing gasket to be tested is located in the closed space. The top of the oxygen bottle head is connected with an oxygen bottle valve, the oxygen bottle valve is connected with a pressure reducing valve, and the pressure reducing valve is respectively connected with a 25MPa oxygen pressure gauge and a 2.5 MPa oxygen pressure gauge; the temperature control device comprises a temperature-adjustable water heater; the air pressure control device is placed in the water heater, a cavity of the water heater is filled with water, and the oxygen bottle head is immersed in the water surface; according to the utility model, wider temperature and oxygen pressure requirements are provided for the oxygen aging resistance test of the rubber sealing element, and a safer detection environment is provided.

Description

Technical Field

[0001] The utility model belongs to the technical field of testing devices, in particular to a testing device for oxygen aging resistance of rubber sealing parts. Background Art

[0002] The rubber ring seals used in oxygen cylinder valves and oxygen stop valves must be subjected to aging tests before assembly. If the oxygen aging resistance of the rubber seals does not meet the requirements, oxygen leakage will occur in the cylinder valve, and oxygen will be released to the external space of the cylinder. Oxygen is an active gas, and if there is an open flame or electric spark, it is very easy to cause safety accidents such as explosions.

[0003] GB / T15382-2021 "General Technical Requirements for Gas Cylinder Valves" requires that the pressure in the device before and during the test should follow Charles' law, one of the three laws of ideal gas, and conform to the ideal gas state equation; the test environment temperature is maintained at 70℃±5℃; the existing testing equipment for oxygen aging resistance testing of rubber seals usually simulates the oxygen concentration, temperature and other environmental factors that may be encountered in the actual use environment to accelerate the aging process and test the durability of the material. However, the pressure in the detection device is not controlled; or although the pressure is controlled, it cannot be adjusted over a large range; at the same time, the heating equipment used to reach the test environment temperature is not suitable for an environment with pure oxygen. If oxygen leaks from the detection device, fire and electric sparks are likely to cause safety accidents. Utility Model Content

[0004] The utility model overcomes the shortcomings of the prior art and proposes a rubber seal oxygen aging resistance test detection device, so as to provide a wider range of temperature and oxygen pressure requirements and a safer detection environment for the rubber seal oxygen aging resistance test.

[0005] In order to achieve the above purpose, the utility model is implemented through the following technical solutions.

[0006] A test device for oxygen aging resistance of rubber seals, comprising an air pressure control device and a temperature control device; the air pressure control device comprises an oxygen cylinder valve, a pressure reducing valve, a 25MPa oxygen pressure gauge, a 2.5MPa oxygen pressure gauge, an output oxygen connector, an oxygen cylinder head, a sealing plate and a plug; the sealing plate is fixedly connected to the bottom of the oxygen cylinder head; the plug is detachably and sealingly connected to the sealing plate, the plug is provided with an open placement groove, and the rubber sealing pad to be tested is placed in the placement groove; the oxygen cylinder head, the sealing plate and the plug form a closed space for oxygenation, and the rubber sealing pad to be tested is located in the closed space; the top of the oxygen cylinder head is connected to the oxygen cylinder valve, the oxygen cylinder valve is connected to the pressure reducing valve, and the pressure reducing valve is respectively connected to the 25MPa oxygen pressure gauge and the 2.5MPa oxygen pressure gauge; the pressure reducing valve is also connected to the output oxygen connector; the temperature control device comprises a temperature-adjustable water heater; the air pressure control device is placed in the water heater, the water heater cavity is filled with water, and the water surface immerses the oxygen cylinder head.

[0007] Furthermore, a through hole is provided at the center of the sealing plate, a thread is provided on the inner wall of the through hole, a plug is threadedly connected to the through hole, and a polytetrafluoroethylene pad is provided at the connection between the plug and the sealing plate for sealing.

[0008] Furthermore, the bottom of the sealing plate is connected to the bottom of the water heater cavity through a support.

[0009] Furthermore, a temperature controller is arranged at the bottom of the water heater.

[0010] Furthermore, a bracket is connected to the outer wall of the water heater cavity, the thermometer is hung on the bracket, and the bottom of the thermometer is inserted into the water.

[0011] The beneficial effects of the utility model compared with the prior art are:

[0012] The detection device of the utility model is mainly composed of an air pressure control device and a temperature control device; the air pressure control device has a structure of a pressure reducing valve, a 25MPa oxygen pressure gauge, and a 2.5MPa oxygen pressure gauge, and can detect the oxygen aging resistance test of rubber seals of various gas cylinder valves, effectively improving the pressure adjustment range of the detection device; the temperature control device is carried out in a water heater with constant temperature control and water addition, and the process is safer and controllable; even if a leak occurs, since the entire detection device is immersed in water, the leaking part will not react when it encounters water, and oxygen will slowly diffuse into the air through the water, ensuring that the test is safe and reliable. The utility model provides a reliable detection basis for the use of sealing materials when designing and processing valves, making the design more reliable and safer to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a front view of the oxygen aging resistance test device for rubber seals of the utility model;

[0014] Figure 2 for Figure 1A top view of the connection locations of the 25MPa oxygen pressure gauge and the 2.5MPa oxygen pressure gauge;

[0015] Figure 3 This is a flow chart of the oxygen aging resistance test of the rubber seal in the embodiment.

[0016] In the figure:

[0017] 1. Oxygen cylinder valve; 2. Pressure reducing valve; 3. 25MPa oxygen pressure gauge; 4. 2.5MPa oxygen pressure gauge; 5. Output oxygen connector; 6. Oxygen cylinder head; 7. Polytetrafluoroethylene pad; 8. Plug; 9. Sealing plate; 10. Rubber sealing pad to be tested; 11. Water heater; 12. Temperature controller; 13. Support; 14. Purified water; 15. Thermometer; 16. Bracket. DETAILED DESCRIPTION

[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail in combination with the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The technical solution of the present invention is described in detail below in combination with the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0019] like Figure 1 and Figure 2 As shown, this embodiment provides a rubber seal oxygen aging resistance test detection device, including an air pressure control device and a temperature control device.

[0020] The air pressure control device is composed of an oxygen cylinder valve 1, a pressure reducing valve 2, a 25MPa oxygen pressure gauge 3, a 2.5MPa oxygen pressure gauge 4, an output oxygen connector 5, an oxygen cylinder head 6, a sealing plate 9 and a plug 8. Among them, the oxygen cylinder head 6 adopts a qualified oxygen cylinder head part, and the sealing plate 9 is machined, and the sealing plate 9 is welded to the bottom of the oxygen cylinder head 6; a through hole is arranged in the center of the sealing plate 9, and a thread is arranged on the inner wall of the through hole, and a plug 8 is threadedly connected to the through hole, and a polytetrafluoroethylene pad 7 is arranged at the connection between the plug 8 and the sealing plate 9 for sealing; a placement groove is arranged in the plug 8, and the placement groove is an open structure, and the rubber sealing gasket 10 to be tested is placed in the placement groove. After the plug 8 is connected to the sealing plate 9, the rubber sealing gasket 10 to be tested is placed in the sealed space composed of the oxygen cylinder head 6, the plug 8 and the sealing plate 9. The purpose of setting the plug 8 is to facilitate the placement and removal of the rubber sealing gasket 10 to be tested. The top of the oxygen cylinder head 6 is connected to an oxygen cylinder valve 1, and the oxygen cylinder valve 1 is connected to a pressure reducing valve 2, and the pressure reducing valve 2 is respectively connected to a 25MPa oxygen pressure gauge 3 and a 2.5MPa oxygen pressure gauge 4; the pressure reducing valve 2 is also connected to an output oxygen connector 5. The 25MPa oxygen pressure gauge 3 controls the oxygen pressure in the oxygen cylinder head 6, and the 2.5MPa oxygen pressure gauge 4 controls the oxygen pressure output by the output oxygen connector 5. The air pressure control device provides a sealed and stable test space for the rubber sealing pad 10 to be tested.

[0021] The temperature control device consists of a water heater 11, a temperature controller 12, a support 13, a bracket 16 and a thermometer 15. A temperature controller 12 is provided at the bottom of the water heater 11, and the temperature control range of the temperature controller 12 is 0 to 100°C; the temperature controller 12 is used to adjust the temperature of the water in the water heater 11; the bottom of the air pressure control device is connected to the bottom of the water heater 11 cavity through the support 13. Pure water 14 is poured into the cavity of the water heater 11, submerging the top of the oxygen cylinder head 6, so that the oxygen cylinder head 6 and the outside of the sealing plate 9 are all pure water 14. A bracket 16 is connected to the outer wall of the cavity of the water heater 11, and the thermometer 15 is hung on the bracket 16. The bottom of the thermometer 15 is inserted into the pure water 14 to detect the temperature of the pure water 14. The water bath environment of the temperature control device provides a stable and safe temperature environment for the oxygen cylinder head 6.

[0022] The water heater 11 and the temperature controller 12 are purchased parts, and the support 13 is a welded assembly composed of a steel plate and a support leg, which supports the air pressure control device and protects the heating pipe of the water heater 11 from the weight of the air pressure device. The bracket 16 is used to fix and hang the thermometer 15, which verifies and detects the temperature in real time and records the temperature and time in time.

[0023] The processing method of the air pressure control device is:

[0024] First, weld the sealing plate 9 without a through hole to the bottom of the oxygen cylinder head 6 to form an assembly, and perform color flaw detection on the assembly to detect whether there are cracks at the welding position; perform a water pressure test on the assembly to ensure that the pressure resistance is more than 1.5 times the nominal pressure of 2.3MPa, take 6MPa, and the time is 30min, and there is no water leakage; fill the assembly with nitrogen of more than 99.5%, and the airtightness is more than 1.1 times the nominal pressure of 2.3MPa, take the pressure of 6Mpa, and perform an airtightness test for 3min, and there is no leakage for 3min; degrease the assembly; then open an internal threaded through hole at the center of the bottom of the sealing plate 9, install a polytetrafluoroethylene pad 7 and a plug 8; place the rubber sealing pad 10 to be tested in the placement groove in the plug 8 in advance, assemble the oxygen cylinder valve 1, the pressure reducing valve 2, the 25MPa oxygen pressure gauge 3, the 2.5MPa oxygen pressure gauge 4, and the output oxygen connector 5 to form a closed space, and fill it with oxygen after the shaft is vacuumed.

[0025] The detection operation method of a rubber seal oxygen aging resistance test device described in this embodiment includes the following steps:

[0026] a) Before the test, the air pressure control device is a qualified device. The design indicators of the air pressure device are: the pressure resistance is 1.5 times the nominal pressure of 35MPa, 52.5MPa, and the air tightness is 1.1 times the nominal pressure, 38.5MPa.

[0027] b) Degrease and clean the air pressure control device and the rubber sealing pad 10 to be tested to ensure the quality of the oxygen filling;

[0028] c) Install the rubber sealing gasket 10 to be tested into the air pressure control device through the plug 8 and seal it to form a closed container;

[0029] e) The air pressure control device creates a vacuum to ensure the purity of the oxygen being filled.

[0030] d) Filling oxygen: Filling oxygen should follow Charles' law among the three ideal gas laws, conform to the ideal gas state equation, record the room temperature, and convert the room temperature and test environment temperature into thermodynamic temperature. Open the valve of the air pressure control device, fill until the pressure gauge shows the oxygen pressure at the calculated room temperature. The pressure range is determined according to the nominal pressure tolerance value. Take the upper limit maximum value to fill oxygen, and close the valve of the air pressure control device.

[0031] f) Install a pressure reducing valve 2 on the valve of the air pressure control device, put the air pressure control device filled with oxygen into the temperature control device, immerse the gas cylinder of the air pressure device in the water, and expose the valve controlled by the air pressure control device. The water temperature is automatically controlled at the required test temperature, and monitoring and recording are carried out according to the test requirements;

[0032] g) Adjust the pressure, open the oxygen cylinder valve 1, observe the 25MPa oxygen pressure gauge 3 on the pressure reducing valve 2, and see if the displayed pressure meets the test pressure. If it is higher than the test pressure, open the pressure reducing valve 2 and slowly release the oxygen from the output oxygen connector 5. The output pressure does not need to be controlled, and the pressure of the output oxygen pressure gauge on the pressure reducing valve 2 does not need to be controlled. Slowly release the oxygen in the cylinder until the oxygen pressure in the cylinder reaches the specified oxygen pressure (2.3MPa±0.2MPa). Close the pressure reducing valve, test and observe that the pressure indication of the oxygen pressure gauge on the cylinder does not drop and record it.

[0033] h) After the gas aging test is completed, the gas pressure control device is taken out from the temperature control device, the valve of the gas pressure control device is opened, the oxygen in the device bottle is slowly released, the plug 8 is removed, and the rubber sealing gasket 10 to be tested is taken out;

[0034] i) Check whether the surface of the rubber sealing gasket is cracked or aged;

[0035] j) Generate a test report.

[0036] Take specific actual data as an example:

[0037] According to GB / T15382-2021 "General Technical Requirements for Gas Cylinder Valves" Section 5.1.4.1 Oxygen Aging Resistance, rubber seals should be kept in oxygen at a pressure of (2.3±0.2) MPa and a temperature of (70±5)°C for 96 hours without visible cracks and aging. Design test equipment and formulate practical test operation methods:

[0038] a) The pressure control device for oxygen aging test should have a pressure resistance of more than 1.5 times the nominal pressure of 2.3MPa, and an airtightness of more than 1.1 times the nominal pressure of 2.3MPa. It should be calibrated before each test. The design index of this device is higher than the design index requirement, and the purpose is to meet the oxygen aging test of rubber under other conditions.

[0039] b) Before the test, the air pressure device and rubber sealing gasket are degreased and assembled, the temperature control device is calibrated, and the oxygen cylinder is vacuumed before filling.

[0040] c) Filling oxygen pressure, follow the Charles law among the three laws of ideal gas to calculate the pressure:

[0041] Pressure calculation:

[0042] Given the nominal pressure: P1=2.3MPa, the holding temperature is 70℃, the corresponding thermodynamic temperature is T1=70+273=343(K)

[0043] The indoor temperature is now 28°C, and the corresponding thermodynamic temperature is T2=28+273=301(K)

[0044] Filled with 99.9% oxygen at room temperature, the pressure is P2

[0045] According to Charles' law: V1=V2

[0046] P1 / T1=P2 / T2

[0047] P2=P1T2 / / T1=2.3×301 / 343=2.0MPa

[0048] The nominal pressure is 2.3MPa±0.3MPa, that is, P2=2.0MPa0±0.2MPa takes the upper limit as 2.2MPa

[0049] That is, P2=2.2Mpa.

[0050] d) Design index of temperature control device for oxygen aging test: water temperature is controlled at 70℃±5℃, heat preservation time is 96h, manual real-time monitoring and continuous recording are performed. The pressure in the bottle is controlled in real time by observing the oxygen pressure gauge, and the pressure value is within the test control range (2.3±0.2)MPa.

[0051] e) Inspection process, see Figure 3 .

[0052] The monitoring device described in this embodiment can test the oxygen aging resistance of rubber seals of various gas cylinder valves, providing a reliable testing basis for the use of sealing materials when designing and processing valves, making the design more reliable and the use safer.

[0053] The above content is a further detailed description of the utility model in combination with a specific preferred implementation method. It cannot be determined that the specific implementation methods of the utility model are limited to this. For ordinary technicians in the technical field to which the utility model belongs, they can make several simple deductions or substitutions without departing from the utility model, which should be regarded as belonging to the utility model and the scope of patent protection determined by the submitted claims.

Claims

1. A test device for oxygen aging resistance of rubber seals, characterized in that: The invention comprises an air pressure control device and a temperature control device; the air pressure control device comprises an oxygen cylinder valve (1), a pressure reducing valve (2), a 25 MPa oxygen pressure gauge (3), a 2.5 MPa oxygen pressure gauge (4), an output oxygen connector (5), an oxygen cylinder head (6), a sealing plate (9) and a plug (8); the sealing plate (9) is fixedly connected to the bottom of the oxygen cylinder head (6); the plug (8) is detachably and sealingly connected to the sealing plate (9); the oxygen cylinder head (6), the sealing plate (9) and the plug (8) form a closed space for oxygenation; the rubber sealing pad (10) to be tested is located in the closed space; the top of the oxygen cylinder head (6) is connected to the oxygen cylinder valve (1); the oxygen cylinder valve (1) is connected to the pressure reducing valve (2); the pressure reducing valve (2) is connected to the 25 MPa oxygen pressure gauge (3) and the 2.5 MPa oxygen pressure gauge (4) respectively; the pressure reducing valve (2) is also connected to the output oxygen connector (5); The temperature control device comprises a water heater (11) with adjustable temperature; the air pressure control device is placed inside the water heater (11); the cavity of the water heater (11) is filled with water, and the surface of the water submerges the oxygen cylinder head (6).

2. A rubber seal oxygen aging resistance test detection device according to claim 1, characterized in that: A through hole is provided at the center of the sealing plate (9), a thread is provided on the inner wall of the through hole, a plug (8) is threadedly connected to the through hole, and a polytetrafluoroethylene gasket (7) is provided at the connection between the plug (8) and the sealing plate (9) for sealing.

3. The oxygen aging resistance test detection device for rubber seals according to claim 1 is characterized in that: The bottom of the sealing plate (9) is connected to the bottom of the water heater (11) cavity via a support (13).

4. The oxygen aging resistance test detection device for rubber seals according to claim 1 is characterized in that: A temperature controller (12) is provided at the bottom of the water heater (11).

5. The oxygen aging resistance test detection device for rubber seals according to claim 1 is characterized in that: A hanging bracket (16) is connected to the outer wall of the cavity of the water heater (11), and the thermometer (15) is hung on the hanging bracket (16), with the bottom of the thermometer (15) inserted into the water.

6. The oxygen aging resistance test detection device for rubber seals according to claim 1, characterized in that: The plug (8) is provided with an open placement groove, and the rubber sealing pad (10) to be tested is placed in the placement groove.

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