Valve seat sealing surface pressure test tool and detection method thereof

Abstract

The invention relates to the field of machining, and discloses a valve seat sealing surface pressure test tool and a detection method thereof.The valve seat sealing surface pressure test tool comprises a shell, a valve seat is installed at the right end of the inner wall of the shell, a first O-shaped ring is arranged at the joint of the valve seat and the shell in a sleeving mode, a tension band is arranged on one side of the first O-shaped ring, and a piston is slidably connected to the middle of the inner wall of the shell; a second O-shaped ring is arranged at the joint of the piston and the right side of the shell in a sleeving mode, a base is fixedly arranged at the left end of the inner wall of the shell, an air channel perpendicular to the circle center of the piston is formed in the inner wall of the base and used for being connected with an external air source, and a third O-shaped ring is arranged at the joint of the piston and the left side of the shell in a sleeving mode. And one side of the shell is in threaded connection with a fastening nut. Through the cooperation of the O-shaped ring and the precision machining part, a multi-sealing structure is realized, so that the stability of the air pressure in the tool in the detection process is ensured, the pressure test rework and maintenance cost is reduced, and meanwhile, the assembly qualification rate of the valve seat and the sealing reliability of the product are greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, in particular to a valve seat seal pressure test tool and a detection method thereof. Background Art

[0002] In industrial production, valve seats are important components of fluid control equipment, and their sealing performance directly affects the operating reliability and efficiency of the system. Especially in high-precision application fields such as hydraulic and electronic control operations, the sealing of the valve seat sealing surface is crucial. However, due to the processing errors of the valve seat, differences in material properties, and limitations of the assembly process, poor sealing problems often occur, resulting in leakage during pressure testing or actual use of the product. This not only affects the normal operation of the equipment, but may also cause rework, maintenance, and even safety accidents, leading to economic losses and reduced production efficiency for the company.

[0003] Traditional valve seat seal detection methods mostly rely on pressure testing of the whole machine after assembly. Once leakage is found, the assembled machine needs to be disassembled and reworked, which is not only time-consuming and labor-intensive, but also increases production costs. At the same time, since the post-assembly inspection is usually carried out under high pressure conditions, when the poor sealing problem is accumulated and discovered in the final inspection stage, it has already caused a waste of raw materials and work hours. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a valve seat seal pressure test tool and a detection method thereof, which solves the problem in the prior art that the valve seat sealing performance cannot be quickly and accurately detected before assembly, thereby causing pressure test failure and rework after assembly.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a valve seat sealing pressure testing tool, comprising an outer shell, a valve seat is installed on the right end of the inner wall of the outer shell, a first O-ring is sleeved at the junction of the valve seat and the outer shell, a hoop is provided on one side of the first O-ring, a piston is slidably connected to the middle of the inner wall of the outer shell, a second O-ring is sleeved at the junction of the piston and the right side of the outer shell, a base is fixedly provided at the left end of the inner wall of the outer shell, an air channel perpendicular to the center of the piston is opened on the inner wall of the base for connecting to an external air source, a third O-ring is sleeved at the junction of the piston and the left side of the outer shell, and a fastening nut is threadedly connected to one side of the outer shell.

[0006] Preferably, one of the second O-rings is disposed on the outer wall of the base and in contact with the outer shell, so as to maintain the internal air pressure of the outer shell.

[0007] Preferably, the piston is slidably connected to one side of the base, and the right end of the piston includes but is not limited to being conical or convex.

[0008] Preferably, the fastening nut, base, piston and shell are all made of 3cr l 3 stainless steel.

[0009] A valve seat seal test pressure detection method comprises the following steps:

[0010] S1. Install the valve seat sealing surface to be tested into the pressure test tooling;

[0011] S2, introducing compressed gas from the outer wall of the base of the pressure test tooling;

[0012] S3. Completely immerse the assembled pressure test tooling into the water tank;

[0013] S4. Observe the bubbles around the tooling;

[0014] S5. Complete the detection and screening according to the test results.

[0015] Preferably, the pressure of the compressed gas introduced in step S2 is 0.6 MPa.

[0016] Preferably, the S5 test results include:

[0017] The presence of bubbles indicates that there is leakage in the valve seat;

[0018] No bubbles indicate that the valve seat seal is effective.

[0019] The present invention provides a valve seat seal pressure testing tool and a testing method thereof, which has the following beneficial effects:

[0020] The present invention realizes a multiple sealing structure through the cooperation of O-rings and precision machined parts, thereby ensuring the stability of the internal air pressure of the tooling during the detection process, reducing the pressure test rework and maintenance costs, and greatly improving the assembly qualification rate of the valve seat and the product sealing reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the shell structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0023] Figure 3 It is a schematic diagram of the method steps of the present invention.

[0024] Among them, 1. the first O-ring; 2. the valve seat; 3. the hoop; 4. the second O-ring; 5. the third O-ring; 6. the outer shell; 7. the piston; 8. the base; 9. the fastening nut. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. 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 creative work are within the scope of protection of the present invention.

[0026] Please refer to the attached Figure 1 -Attached Figure 2 The embodiment of the present invention provides a valve seat sealing pressure testing tool, including a shell 6, a valve seat 2 is installed on the right end of the inner wall of the shell 6, a first O-ring 1 is sleeved at the junction of the valve seat 2 and the shell 6, a hoop 3 is provided on one side of the first O-ring 1, a piston 7 is slidably connected to the middle of the inner wall of the shell 6, the right end of the piston 7 includes but is not limited to being conical or convex, and a fastening nut 9 is threadedly connected to one side of the shell 6.

[0027] The fastening nut 9, the base 8, the piston 7 and the housing 6 are all made of 3cr l 3 stainless steel.

[0028] Specifically, a valve seat 2 is fixedly installed on the right end of the inner wall of the shell 6, and the outer periphery of the valve seat 2 is in close contact with the inner wall of the shell 6. A first O-ring 1 is provided at the connection between the valve seat 2 and the shell 6. The first O-ring 1 is sleeved on the outer periphery of the valve seat 2 and embedded in the inner wall groove of the shell 6, which is used to enhance the sealing performance between the valve seat 2 and the shell 6 and effectively prevent gas leakage from the joint. A hoop 3 is provided on one side of the first O-ring 1, and the hoop 3 further improves the sealing effect by compressing the first O-ring 1, while ensuring that the first O-ring 1 will not be displaced or deformed during the assembly process. A piston 7 is slidably connected to the middle part of the inner wall of the shell 6, and the piston 7 slides axially along the inner wall of the shell 6 to ensure that the gas pressure can be evenly applied to the sealing surface of the valve seat 2 during the sealing surface test. The right end of the piston 7 is designed to be conical or convex to adapt to the sealing surface of the valve seat 2 of different shapes, so as to more accurately simulate the actual working conditions and improve the accuracy and applicability of the pressure test.

[0029] One side of the shell 6 is connected to the fastening nut 9 through a threaded structure. The fastening nut 9 presses the base 8 to the other end of the shell 6 by tightening, forming a stable overall structure, ensuring that the inside of the tooling can withstand the gas pressure without loosening or leakage during the pressure test. The design of the fastening nut 9 and the base 8 not only provides reliable support, but also ensures that the piston 7 maintains smooth movement during the pressure test by axially limiting the piston 7, avoiding measurement errors caused by uneven pressure. The material of the base 8, the shell 6, the fastening nut 9 and the piston 7 are all made of 3Cr13 stainless steel. This material has excellent corrosion resistance and mechanical strength, and can withstand the pressure, friction and environmental influences during the test for a long time, ensuring the durability and reliability of the tooling.

[0030] Through the above structural design, the valve seat 2 sealing pressure test tool can quickly realize the air pressure sealing test of the sealing surface of the valve seat 2. The combination of the first O-ring 1 and the hoop 3 ensures the air tightness between the valve seat 2 and the housing 6, the sliding connection piston 7 effectively simulates the working state of the actual sealing surface, and the cooperation of the fastening nut 9 and the base 8 provides a reliable guarantee for the stability of the tool as a whole.

[0031] A second O-ring 4 is sleeved at the right side of the piston 7 and the housing 6. A base 8 is fixedly provided at the left end of the inner wall of the housing 6. An air passage perpendicular to the center of the piston 7 is provided on the inner wall of the base 8 for connection with an external air source. A third O-ring 5 is sleeved at the left side of the piston 7 and the housing 6. A fastening nut 9 is threadedly connected to one side of the housing 6. One of the second O-rings 4 is sleeved on the outer wall of the base 8 and contacts the housing 6 to maintain the internal air pressure of the housing 6. The piston 7 is slidably connected to one side of the base 8.

[0032] Specifically, a second O-ring 4 is sleeved at the contact point between the right end of the piston 7 and the inner wall of the outer shell 6. The second O-ring 4 is embedded in the inner wall groove of the outer shell 6 and the outer peripheral groove of the piston 7, and is used to prevent gas leakage when the piston 7 slides, while ensuring smooth sliding of the piston 7, enhancing the sealing performance and maintaining stable air pressure inside the tooling.

[0033] A base 8 is fixedly provided at the left end of the inner wall of the outer shell 6. The base 8 and the outer shell 6 are connected by precision machining, and an air passage perpendicular to the center of the piston 7 is opened on the inner wall of the base 8. The air passage runs through the base 8 and is connected to an external air source, which is used to introduce air pressure into the tooling to provide a stable pressure source for the pressure test process. Another second O-ring 4 is sleeved at the contact point between the outer wall of the base 8 and the inner wall of the outer shell 6. The second O-ring 4 is embedded in the outer peripheral groove of the base 8 and the inner wall groove of the outer shell 6. The sealing effect between the base 8 and the outer shell 6 is ensured by the sealing assembly, which effectively prevents gas leakage through the joint of the base 8 and the outer shell 6.

[0034] A third O-ring 5 is sleeved at the contact point between the left end of the piston 7 and the other side of the inner wall of the shell 6. The third O-ring 5 is embedded in the outer peripheral groove of the piston 7 and the inner wall groove of the shell 6 to ensure that when the piston 7 slides during the pressure test, it can effectively block the gas from leaking between the left contact surface of the piston 7 and the shell 6, further improving the air pressure stability inside the tooling. One side of the shell 6 is connected to the fastening nut 9 by threading. The fastening nut 9 reliably presses the base 8 to the left end of the inner wall of the shell 6 by tightening, so that the base 8 and the shell 6 form a tight overall structure, thereby maintaining the overall stability of the tooling under air pressure loading conditions.

[0035] One end of the piston 7 is slidably connected to one side of the base 8, and the sliding direction of the piston 7 is limited by the guide groove of the base 8, so that it can only move smoothly along the axial direction, and at the same time ensure that the piston 7 can accurately simulate the working state of the valve seat 2 under the action of air pressure. The base 8 not only plays a supporting and guiding role, but also provides an air pressure channel for the entire tooling through the air channel, and the sealing combination with the O-ring realizes the uniformity and airtightness of the air pressure inside the entire tooling.

[0036] The above structural design enables the valve seat seal pressure test tooling to achieve high-precision seal detection under dynamic conditions of air pressure loading, ensuring that there is no gas leakage during the use of the entire tooling.

[0037] Embodiment 2:

[0038] Please see attached Figure 3 , a valve seat seal test pressure detection method, comprising the following steps:

[0039] S1. Place the sealing surface of the valve seat 2 to be tested into the pressure test fixture;

[0040] Specifically, the sealing surface of the valve seat 2 to be tested is installed in a special pressure test tool to ensure that the valve seat 2 is in close contact with the inner wall of the shell 6 of the pressure test tool and is sealed by the first O-ring 1. At the same time, the fastening nut 9 of the tool is adjusted to ensure that the valve seat 2 is stably positioned in the pressure test tool without loosening or displacement.

[0041] S2, introduce compressed gas from the outer wall of the base 8 of the pressure test fixture, the air pressure is 0.6MPa;

[0042] Specifically, an external gas source is connected to the airway interface of the pressure test fixture base 8, and compressed gas with a pressure of 0.6MPa is introduced into the sealed cavity of the pressure test fixture through the airway on the inner wall of the base 8. The gas is evenly transferred to the sealing surface of the valve seat 2 through the piston 7, simulating low-pressure sealing working conditions. This step ensures that the pressure inside the fixture is maintained in a constant range to avoid interference with the test results caused by pressure fluctuations.

[0043] S3. Completely immerse the assembled pressure test tooling into the water tank;

[0044] Specifically, slowly and completely immerse the assembled pressure test tooling into the water tank to ensure that the sealing surface and external joints of the tooling are completely in the underwater environment so as to observe possible gas leakage. When immersing in the water tank, avoid moving too quickly to prevent disturbing the water surface and affecting the observation effect.

[0045] S4. Observe the bubbles around the tooling;

[0046] Specifically, carefully observe whether there are bubbles around the pressure test tooling. When there is a leak on the sealing surface of the valve seat 2, gas will overflow from the leak point and form bubbles; conversely, if no bubbles emerge, it means that the sealing performance of the valve seat 2 is good. This step requires the operator to keep his eyes focused to ensure that no bubbles are missed during the detection process.

[0047] S5. According to the test results, the detection and screening are completed. When bubbles appear, it indicates that there is leakage in the valve seat 2. When there are no bubbles, it indicates that the sealing of the valve seat 2 is effective.

[0048] Specifically, the valve seat 2 is screened and judged based on the observation results. If bubbles are found in the test, it is determined that the valve seat 2 has a leakage problem, its sealing performance is unqualified, and it cannot be used for subsequent assembly; if no bubbles are found, it means that the sealing surface of the valve seat 2 is effective, and it is allowed to pass the test. The qualified valve seat 2 that has passed the screening can be directly put into production and use, and the unqualified products need to be repaired or scrapped.

[0049] Through the above steps, combined with the sealing design of the pressure test tooling and the intuitive detection method of the water tank, this detection method can quickly and reliably screen out valve seats 2 with poor sealing performance and prevent unqualified products from entering the assembly process. This method has the characteristics of simple operation, high detection efficiency, and wide applicability, and can significantly improve the quality control level of the valve seat 2 and the reliability of the production process.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A valve seat seal pressure test tool, comprising a housing (6), characterized in that: A valve seat (2) is installed at the right end of the inner wall of the shell (6); a first O-ring (1) is sleeved at the junction of the valve seat (2) and the shell (6); a hoop (3) is arranged on one side of the first O-ring (1); a piston (7) is slidably connected to the middle of the inner wall of the shell (6); a second O-ring (4) is sleeved at the junction of the piston (7) and the right side of the shell (6); a base (8) is fixedly arranged at the left end of the inner wall of the shell (6); an air passage perpendicular to the center of the piston (7) is opened on the inner wall of the base (8) for connecting to an external air source; a third O-ring (5) is sleeved at the junction of the piston (7) and the left side of the shell (6); and a fastening nut (9) is threadedly connected to one side of the shell (6).

2. A valve seat seal pressure testing tool according to claim 1, characterized in that: One of the second O-rings (4) is sleeved on the outer wall of the base (8) and in contact with the outer shell (6), so as to maintain the internal air pressure of the outer shell (6).

3. The valve seat seal pressure testing tool according to claim 1, characterized in that: The piston (7) is slidably connected to one side of the base (8), and the right end of the piston (7) includes but is not limited to being conical or convex.

4. The valve seat seal pressure testing tool according to claim 1, characterized in that: The fastening nut (9), the base (8), the piston (7) and the housing (6) are all made of 3crl 3 stainless steel.

5. A valve seat seal test pressure testing method, according to a valve seat seal test pressure testing tool according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Place the sealing surface of the valve seat (2) to be tested into the pressure test tool; S2, introducing compressed gas from the outer wall of the base (8) of the pressure test tool; S3. Completely immerse the assembled pressure test tooling into the water tank; S4. Observe the bubbles around the tooling; S5. Complete the detection and screening according to the test results.

6. A valve seat seal test pressure detection method according to claim 5, characterized in that: The pressure of the compressed gas introduced in step S2 is 0.6 MPa.

7. A valve seat seal test pressure detection method according to claim 5, characterized in that: The S5 test results include: The presence of bubbles indicates that there is leakage in the valve seat (2); No bubbles are present, indicating that the valve seat (2) is sealing effectively.

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