Seal ring mounting structure for preventing displacement of seal ring during mounting, and pressure relief valve for gas cylinder

Abstract

The utility model discloses a prevent sealing washer shift's sealing washer installation structure and pressure relief valve for gas cylinder, and installation structure sets up on valve body, is equipped with annular limit step on valve body and is equipped with the installation structure for installing below limit step, and installation structure includes the annular embedding recess that sets up at installation structure top, and embedding recess includes the first recess that forms to valve body radial extension and the second recess that is located limit step bottom surface inside and extends upwards, and first recess and second recess form the embedding recess for installing annular sealing washer to make valve body when vertical press -mounting fill part to second recess and form radial limit. The application installs sealing washer through setting two recesses, wherein first recess is used to accommodate sealing washer, and second recess is used to provide a space that fills when press -mounting to the sealing washer is extruded upwards, avoids sealing washer and is extruded and extends outwardly and deforms and is pressed on annular step bottom surface to appear leakage point at deformation position.

Description

Technical Field

[0001] This utility model relates to pressure relief valves, and more particularly to a sealing ring mounting structure for preventing the sealing ring from shifting during installation and a pressure relief valve for gas cylinders. Background Technology

[0002] Pressure relief valves can automatically open and close according to the system's working pressure and are generally installed on equipment or pipelines in closed systems to protect system safety.

[0003] Our company's earlier application, application number 2024220383778, disclosed a pressure relief valve for gas cylinders. Its instruction manual states that "the valve seat is also provided with an annular step, and an annular groove is provided on the side wall at the inner end face of the annular step, and the sealing ring is installed in the annular groove."

[0004] The aforementioned patent uses an annular groove below the annular step to install the sealing ring. However, in actual use, we found that when this structure is press-fitted, the exposed part of the sealing ring is squeezed and the sealing ring is pulled outward, which may cause the sealing ring to be deformed and pressed against the bottom surface of the annular step during pressing, thus losing its sealing effect. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the sealing ring may be deformed and pressed against the bottom surface of the annular step when it is compressed, thus losing its sealing effect. This utility model provides a pressure relief valve for gas cylinders.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0007] A sealing ring mounting structure to prevent displacement of the sealing ring during installation is provided on the valve body. The valve body has an annular limiting step and a mounting structure for installation is provided below the limiting step. The mounting structure includes an annular embedding groove at the top of the mounting structure. The embedding groove includes a first recess extending radially toward the valve body and a second recess located inside the bottom surface of the limiting step and extending upward. The first recess and the second recess form an embedding groove for installing the annular sealing ring, so that the valve body is partially filled into the second recess during vertical pressing to form radial limiting.

[0008] Preferably, the bottom of the first recess is an arc-shaped contact surface, which is used to contact the surface of the sealing ring.

[0009] Preferably, the second recess is located at the root of the limiting step, and the junction between the second and first recesses has a smooth, concave transition surface.

[0010] Preferably, the width of the second recess gradually increases from the outside to the inside.

[0011] Preferably, the outer end of the second recess is located between the outer end of the limiting step and the root of the limiting step.

[0012] The pressure relief valve for gas cylinders includes a valve body, an annular limiting step on the valve body, and an installation structure for installation below the limiting step. It also includes the aforementioned sealing ring installation structure to prevent the sealing ring from shifting during installation.

[0013] Preferably, the valve body includes a valve seat installed at the gas cylinder's pressure relief port. The valve seat has an exhaust channel, and within the exhaust channel is a valve core supported by an elastic support structure. When the pressure at the inner end of the valve seat is below a threshold, the valve core blocks the exhaust channel. When the pressure at the inner end of the valve seat is above the threshold, the elastic support structure is pressurized, causing the valve core to move and open the exhaust channel to release air. The elastic support structure includes a cylindrical mounting base with an exhaust port and a spring mounted on the mounting base. The spring applies elastic force to the valve core, causing it to close the exhaust channel. The outer wall of the mounting base abuts against the side wall of the exhaust channel, and at least one fixing groove is provided at the top of the outer wall of the mounting base. An annular boss is provided at the outer end of the valve seat, and a limiting boss extending into the fixing groove is formed by pressure on the inner side wall of the annular boss. The exhaust port includes three arc-shaped slots arranged in a circular array; the fixing grooves and limiting bosses are provided in three sets, corresponding one-to-one. In this solution, a fixing groove is set on the mounting base, and the valve seat is squeezed to deform it and form a limiting boss that extends into the fixing groove, thereby pressing the mounting base tightly. This fixing method is stable and will not loosen, and the pressure relief threshold remains stable during use.

[0014] Preferably, the inner wall of the valve seat is provided with a sliding groove, and the mounting base is provided with a raised rib that extends into the sliding groove and can slide along the sliding groove. There are three sets of raised ribs and grooves, which correspond one to one. The raised ribs extend into the grooves to play a positioning and limiting role.

[0015] Preferably, the outer wall of the annular boss is provided with a tightening surface for tightening with a tightening tool. The tightening surface is used for tightening the entire valve seat, and it is also used for positioning to find the position that needs to be squeezed, so that the pressing device can squeeze the annular boss to deform it and extend it into the fixing groove to form a limit.

[0016] Preferably, the inner wall of the annular boss is a circular curved surface, with the diameter gradually increasing from the inner end to the outer end. This structure not only reduces the resistance to compression but also allows the surface to deform towards the thinner inner part during pressing, which is beneficial for compressing a portion of the annular boss into the fixing groove.

[0017] Preferably, the exhaust passage sidewall is provided with an annular abutment step, the inner end of the mounting seat abuts against the annular abutment step, the mounting seat is provided with a sleeve with a socket, one end of the elastic spring is sleeved on the sleeve, and an end cap is inserted into the socket.

[0018] Preferably, one end of the valve seat is provided with a sealing platform with a pressure relief hole, and both ends of the valve core have cylindrical grooves. A circular sealing gasket is installed in the groove at one end, and a spring spring is installed in the groove at the other end. Under the action of the spring spring, the valve core causes the sealing gasket to abut against the sealing platform to block the pressure relief hole.

[0019] Preferably, the valve core and valve seat are fitted with a clearance fit or the valve seat is provided with an exhaust groove, so that a connected exhaust channel is formed in the valve seat when the valve core slides.

[0020] Compared with the prior art, the advantages of this utility model are as follows: This application installs the sealing ring by setting two recesses, wherein the first recess is used to accommodate the sealing ring, and the second recess is used to provide a space for the sealing ring to be filled by being squeezed upward during press-fitting, so as to avoid the sealing ring being squeezed outward and deformed and pressed against the bottom surface of the annular step, resulting in leakage at the deformation position. Attached Figure Description

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0022] Figure 1 This is a cross-sectional view of Example 1;

[0023] Figure 2 This is a perspective view of Example 2;

[0024] Figure 3 This is an exploded view of Example 2;

[0025] Figure 4 This is an exploded view of Example 2;

[0026] In the diagram: 10, valve seat; 100, limiting boss; 101, exhaust passage; 102, annular boss; 1021, curved surface; 1022, tightening plane; 103, abutting step; 104, embedded groove; 1041, first recess; 1042, second recess; 105, external thread; 106, annular step; 107, pressure relief hole; 20, valve core; 30, mounting base; 301, vent hole; 302, fixing groove; 303, sleeve; 304, insertion hole; 40, elastic spring; 50, end cap; 60, sealing ring; 70, sealing gasket. Detailed Implementation

[0027] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0028] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it may not be further defined and explained in subsequent figures. Example

[0029] This embodiment mainly describes the title of the sealing ring mounting structure to prevent the sealing ring from shifting during installation, as follows:

[0030] A sealing ring mounting structure to prevent the sealing ring from shifting during installation, such as... Figure 1 As shown, it is mounted on the valve body, which has an annular limiting step 106 and a mounting structure below the step for installation. The mounting structure includes an annular embedding groove 104 at the top of the mounting structure. The embedding groove 104 includes a first recess 1041 extending radially towards the valve body and a second recess 1042 located inside the bottom surface of the limiting step 106 and extending upward. The first recess 1041 and the second recess 1042 form an embedding groove for installing the annular sealing ring 60, so that the valve body is partially filled into the second recess 1042 during vertical pressing, thus forming a radial limit. This solution uses two recesses to install the sealing ring 60, where the first recess 1041 is used to accommodate the sealing ring 60, and the second recess 1042 is used to provide a space for the sealing ring 60 to be filled by upward pressing during pressing, avoiding the sealing ring 60 from being squeezed outward and deformed and pressed against the bottom surface of the annular step 106, thus preventing leakage at the deformed position.

[0031] Preferably, the bottom of the first recess 1041 is an arc-shaped contact surface, which is used to contact the surface of the sealing ring 60.

[0032] Preferably, the second recess 1042 is located at the root of the limiting step 106, and its junction with the first recess 1041 has a smooth, concave transition surface. The opening of the recess formed in this design is inclined downwards, which guides the sealing ring 60.

[0033] Preferably, the width of the second recess 1042 gradually increases from the outside to the inside. This structure allows the sealing ring 60 to be compressed and filled at the junction of the first recess 1041 and the second recess 1042 when the sealing ring 60 is compressed. This process is an inward deformation process and will not cause the sealing ring 60 to be pulled outward.

[0034] Preferably, the outer end of the second recess 1042 is located between the outer end of the limiting step 106 and the root of the limiting step 106. This design can form an inner recessed structure for limiting, and the volume of the inner recessed structure is relatively small, so that the sealing ring 60 is partially accommodated, while a portion of the sealing ring 60 remains on the outside for tight contact with other components to form a seal during installation. Example

[0035] This embodiment mainly describes the title of the pressure relief valve for gas cylinders, as follows:

[0036] Gas cylinders use pressure relief valves, such as Figure 2-4 As shown, the device includes a valve body with an annular limiting step 106 and a mounting structure below the limiting step 106 for installation. It also includes the aforementioned sealing ring mounting structure to prevent displacement of the sealing ring during installation. The mounting structure can be a threaded or interference-fit press-fit surface.

[0037] like Figure 1-4 As shown, the valve body includes a copper valve seat 10 installed at the gas cylinder's pressure relief port. The valve seat 10 has an exhaust channel 101, and a valve core 20 supported by an elastic support structure is located within the exhaust channel 101. When the pressure at the inner end of the valve seat 10 is lower than a threshold, the valve core 20 blocks the exhaust channel 101. When the pressure at the inner end of the valve seat 10 is greater than the threshold, the elastic support structure is compressed, the valve core 20 moves, and the exhaust channel 101 is opened to release air. The elastic support structure includes a copper valve seat 10 with an exhaust port 301. A cylindrical mounting base 30 and a spring 40 are provided on the mounting base 30. The spring 40 applies a spring force to the valve core 20, causing the valve core 20 to close the exhaust passage 101. The outer wall of the mounting base 30 abuts against the side wall of the exhaust passage 101, and at least one fixing groove 302 is provided at the top of the outer wall of the mounting base 30. An annular boss 102 is provided at the outer end of the valve seat 10. The inner side wall of the annular boss 102 is pressed to form a limiting boss 100 extending into the fixing groove 302. The air outlet 301 includes three arc-shaped slots arranged in a circular array. Three sets of fixing grooves 302 and limiting bosses 100 are provided and correspond one-to-one. In this solution, fixing grooves 302 are provided on the mounting base 30, and the valve seat 10 is squeezed to deform it and form the limiting bosses 100 extending into the fixing grooves 302, thus pressing the mounting base 30 tightly. This fixing method is stable and will not loosen. The pressure relief threshold remains stable during use.

[0038] Preferably, the inner wall of the valve seat 10 is provided with a sliding groove, and the mounting base 30 is provided with a raised rib that extends into the sliding groove and can slide along the sliding groove. Three sets of raised ribs and grooves are provided, each corresponding to the other. The raised ribs extend into the grooves to serve a positioning and limiting function. The structure of this design is not shown in the attached drawings.

[0039] Preferably, the outer wall of the annular boss 102 is provided with a tightening surface 1022 for tightening with a tightening tool. Three tightening surfaces 1022 are arranged in a circular array, used for tightening the entire valve seat 10. They also serve to position the valve seat 10 to locate the area requiring compression, allowing a pressing device to compress and deform the annular boss 102, causing it to extend into the fixing groove 302 and form a limit. The tightening tool can be a wrench or similar device.

[0040] Preferably, the inner wall of the annular boss 102 is a circular curved surface 1021, with the diameter of the curved surface 1021 gradually increasing from the inner end to the outer end. This structure not only reduces the resistance to compression, but also allows it to deform towards the thinner inner part when pressed down, which is beneficial for compressing a portion of the annular boss 102 into the fixing groove 302.

[0041] Preferably, the side wall of the exhaust channel 101 is provided with an annular abutment step 103, the inner end of the mounting base 30 abuts against the annular abutment step 103, the mounting base 30 is provided with a sleeve post 303 with an insertion hole 304, one end of the elastic spring 40 is sleeved on the sleeve post 303, and an end cap 50 is inserted into the insertion hole 304.

[0042] Preferably, one end of the valve seat 10 is provided with a sealing platform with a pressure relief hole 107, and both ends of the valve core 20 have cylindrical grooves. A circular sealing gasket 70 is installed in the groove at one end, and a spring spring 40 is installed in the groove at the other end. Under the action of the spring spring 40, the valve core 20 causes the sealing gasket 70 to abut against the sealing platform to block the pressure relief hole 107.

[0043] Preferably, the valve core 20 and the valve seat 10 are fitted with a clearance or the valve seat 10 is provided with an exhaust groove, so that when the valve core 20 slides, a connected exhaust channel 101 is formed in the valve seat 10.

[0044] The above provides a detailed description of the sealing ring installation structure and the pressure relief valve for gas cylinders that prevent the sealing ring from shifting during installation. Specific examples have been used to illustrate the principle and implementation of this utility model. The above description of the embodiments is only for the purpose of helping to understand this utility model and its core ideas. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A sealing ring mounting structure to prevent displacement of the sealing ring during installation, which is disposed on the valve body, wherein the valve body has an annular limiting step and a mounting structure for installation is provided below the limiting step, characterized in that: The device includes an annular recess located at the top of the mounting structure. The recess includes a first recess extending radially toward the valve body and a second recess located inside the bottom surface of the limiting step and extending upward. The second recess is located at the root of the step. The first and second recesses form a recess for installing an annular sealing ring, such that the valve body is partially filled into the second recess during vertical pressing to form a radial limit.

2. The sealing ring mounting structure for preventing displacement of the sealing ring during installation according to claim 1, characterized in that: The bottom of the first recess is an arc-shaped contact surface, which is used to fit against the surface of the sealing ring.

3. The sealing ring mounting structure for preventing displacement of the sealing ring during installation according to claim 1, characterized in that: The junction between the second recess and the first recess has a smooth, concave transition surface.

4. The sealing ring mounting structure for preventing displacement of the sealing ring during installation according to claim 1, characterized in that: The width of the second concave portion gradually increases from the outside to the inside.

5. The sealing ring mounting structure for preventing displacement of the sealing ring during installation according to claim 1, characterized in that: The outer end of the second concave part is located between the outer end of the step and the root of the step.

6. A pressure relief valve for gas cylinders, comprising a valve body, wherein the valve body has an annular limiting step and a mounting structure for installation is provided below the limiting step, characterized in that: It also includes the sealing ring mounting structure according to any one of claims 1-5 to prevent the sealing ring from shifting during installation.

7. The pressure relief valve for gas cylinders according to claim 6, characterized in that: The valve body includes a valve seat installed at the gas cylinder pressure relief port. The valve seat has an exhaust channel and a valve core supported by an elastic support structure. When the pressure at the inner end of the valve seat is lower than a threshold, the valve core blocks the exhaust channel. When the pressure at the inner end of the valve seat is higher than the threshold, the elastic support structure is pressed, the valve core moves, and the exhaust channel is opened to release air. The elastic support structure includes a cylindrical mounting base with an exhaust hole and a spring on the mounting base. The spring applies elastic force to the valve core to close the exhaust channel. The outer wall of the mounting base is against the side wall of the exhaust channel, and at least one fixing groove is provided at the top of the outer wall of the mounting base. An annular boss is provided at the outer end of the valve seat. The inner side wall of the annular boss is pressed to form a limiting boss that extends into the fixing groove.

8. The pressure relief valve for gas cylinders according to claim 7, characterized in that: The inner wall of the valve seat is provided with a sliding groove, and the mounting seat is provided with a raised rib that extends into the sliding groove and can slide along the sliding groove. The outer wall of the annular boss is provided with a tightening plane for fitting a tightening tool for tightening installation. The inner wall of the annular boss is a circular curved surface, and the diameter of the curved surface gradually increases from the inner end to the outer end.

9. The pressure relief valve for gas cylinders according to claim 7, characterized in that: The exhaust passage sidewall is provided with an annular abutment step, the inner end of the mounting base abuts against the annular abutment step, the mounting base is provided with a sleeve with a socket, one end of the elastic spring is sleeved on the sleeve, and an end cap is inserted into the socket.

10. The pressure relief valve for gas cylinders according to claim 7, characterized in that: One end of the valve seat is equipped with a sealing platform with a pressure relief hole. Both ends of the valve core have cylindrical grooves. A circular sealing gasket is installed in the groove at one end, and a spring spring is installed in the groove at the other end. Under the action of the spring spring, the valve core causes the sealing gasket to abut against the sealing platform to block the pressure relief hole. The valve core and valve seat are clearance-fitted or the valve seat is equipped with an exhaust groove, so that a connected exhaust channel is formed in the valve seat when the valve core slides.

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