Safety valve with sealing compensation structure

Abstract

The safety valve with the sealing compensation structure comprises a valve body, a medium channel arranged on the valve body, a pressure relief channel and a valve rod, a valve element sealing piece is arranged at the outlet end of the medium channel, and a valve clack which is in sealing contact with the valve element sealing piece to open and close an outlet of the medium channel is arranged at the lower end of the valve rod. The valve element sealing piece is arranged on the valve body through a sealing compensation structure. The sealing compensation structure comprises a sealing valve seat, the sealing valve seat is elastically arranged in the medium channel and used for enabling the valve element sealing piece to ascend to make sealing contact with the valve clack, the sealing valve seat is provided with a first channel along the central axis, the medium flows through the first channel, and an outlet of the first channel is matched with the valve clack. The sealing compensation structure is arranged in the medium channel, and the valve element sealing piece is arranged on the sealing compensation structure, so that when the valve element sealing piece is poor in rebound resilience and cannot stop flow quickly, the valve element sealing piece is driven to move upwards to be close to the valve clack and make sealing contact with the valve clack, quick flow stopping is achieved, the structure is simple, and the cost is low. The sealing process is stable and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and particularly relates to a safety valve with a seal compensation structure. Background Art

[0002] The working principle of overpressure release of the safety valve is the confrontation between internal pressure and a preset spring force. When the internal pressure is lower than the preset spring force, under the action of the spring force, the valve flap is pressed tightly against the valve core seal, and the seal of the internal pressure is realized through the physical elasticity of the valve core material. When the internal pressure is higher than the preset spring force, the valve flap is lifted by the internal pressure and disengages from the valve core seal, and at this time, overpressure release of the internal pressure is implemented. When the internal pressure gradually decreases with the release, the valve flap gradually fits against the valve core seal under the action of the preset spring force, and the valve core seal made of rubber material has a certain elasticity and restoring force, thus ensuring the seal of the valve flap after pressure relief.

[0003] However, due to the heat resistance, cold resistance, chemical compatibility, and fatigue vulnerability of the rubber material itself, the safety valve has a high vulnerability rate and frequent replacement under working conditions such as high and low temperatures and strong corrosion. Summary of the Invention

[0004] In order to overcome the above defects, the utility model provides a safety valve with a seal compensation structure, which can be applied to any working condition environment.

[0005] The technical solution adopted by the utility model to solve its technical problems is: to provide a safety valve with a seal compensation structure, including a valve body, a medium channel arranged at the bottom of the valve body, and a pressure relief channel arranged at the side of the valve body. A valve core seal is arranged at the outlet end of the medium channel. A valve rod is arranged in the valve body and moves up and down along the central axis of the medium channel. A valve flap for sealing and contacting the valve core seal to open and close the outlet of the medium channel is arranged at the lower end of the valve rod. The valve core seal is arranged on the valve body through a seal compensation structure;

[0006] The seal compensation structure includes a seal valve seat, which is elastically arranged in the medium channel and is used to make the valve core seal rise to seal and contact the valve flap. A first channel for the medium to flow through is opened along the central axis on the seal valve seat, and the outlet of the first channel is adapted to the valve flap.

[0007] As a further improvement of the utility model, the seal compensation structure further includes:

[0008] A limit bolt, which is threadedly connected to the medium channel, and a second channel for the medium to flow through is opened along the central axis of the limit bolt;

[0009] A return spring, which is arranged between the seal valve seat and the limit bolt, and both ends of the return spring are elastically abutted against the limit bolt and the seal valve seat respectively.

[0010] As a further improvement of the present utility model, the sealing valve seat includes a sealing bearing portion adapted to the outlet of the medium passage and a guiding portion integrally connected to the sealing bearing portion. At least part of the outer peripheral wall of the sealing bearing portion abuts against the inner wall on one side of the outlet of the medium passage, and the outer peripheral wall of the guiding portion abuts against the inner wall of the medium passage;

[0011] A sealing ring is provided between the sealing bearing portion and the medium passage.

[0012] As a further improvement of the present utility model, a receiving groove is provided on one end face of the sealing bearing portion facing the valve stem, and the valve core seal is embedded in the receiving groove.

[0013] As a further improvement of the present utility model, the guiding portion is provided with an upper positioning groove hole adapted to the outer diameter of the return spring along the central axis; the threaded portion of the limit bolt is provided with a lower positioning groove hole adapted to the outer diameter of the return spring along the central axis;

[0014] The return spring is compressed in the accommodating cavity formed by the upper positioning groove hole and the lower positioning groove hole.

[0015] As a further improvement of the present utility model, the inlet end of the second passage of the limit bolt is set to be a hexagonal shape convenient for disassembly.

[0016] As a further improvement of the present utility model, the valve flap, the sealing valve seat, and the return spring are respectively made of precipitation hardening stainless steel; the valve core seal is made of engineering plastic or austenitic stainless steel.

[0017] The beneficial effects of the present utility model are as follows: By providing a sealing compensation structure in the medium passage and arranging the valve core seal on the sealing compensation structure, when the valve core seal has poor resilience and it is difficult to quickly stop the flow, the valve core seal is driven to move upward to approach the valve flap and make a sealing contact therewith, so as to achieve quick stop of the flow. The structure is simple and the sealing process is stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the safety valve of the present utility model;

[0019] Figure 2 It is a schematic cross-sectional view of the present utility model in the A-A direction;

[0020] Figure 3 It is a schematic exploded structural diagram of the present utility model without the valve body.

[0021] In combination with the accompanying drawings, the following description is made:

[0022] 0', Central axis; 1, Valve body; 11, Medium channel; 12, Pressure relief channel;

[0023] 2, Valve core seal; 3, Valve stem; 4, Valve flap; 5, Sealing valve seat; 51, First channel; 52, Sealing bearing part; 521, Accommodating groove; 53, Guiding part; 531, Upper positioning slot hole; 6, Limit bolt; 61, Second channel; 62, Lower positioning slot hole; 7, Return spring; 8, Sealing ring; 9, Accommodating cavity. Detailed implementation mode

[0024] The following combines with the attached drawings to make a detailed description of a preferred embodiment of the present invention.

[0025] A safety valve with a seal compensation structure provided by the present invention needs to be noted that refer to Figure 1 , the valve body 1 is not provided with technical features such as a preset spring, valve cover, etc. The simplified technical features are the same as those of the existing safety valve, and the invention created this time is to achieve a sealed contact between the valve core seal 2 and the valve flap 4. Therefore, the parts that are the same as the existing technology will not be described in detail.

[0026] Refer to Figure 2 and 3 , the safety valve with a seal compensation structure provided by the present invention includes a valve body 1, a medium channel 11 provided at the bottom of the valve body 1, and a pressure relief channel 12 provided at the side of the valve body 1. A valve core seal 2 is provided at the outlet end of the medium channel 11. A valve stem 3 that moves up and down along the central axis 0' of the medium channel 11 is provided in the valve body 1. A valve flap 4 that is in sealed contact with the valve core seal 2 to open and close the outlet of the medium channel 11 is provided at the lower end of the valve stem 3. The valve core seal 2 is provided in the valve body 1 through a seal compensation structure.

[0027] Specifically, the seal compensation structure includes a sealing valve seat 5. The sealing valve seat 5 is elastically arranged in the medium channel 11 and is used to make the valve core seal 2 rise to be in sealed contact with the valve flap 4. A first channel 51 for the medium to flow through is opened on the sealing valve seat 5 along the central axis 0', and the outlet of the first channel 51 is adapted to the valve flap 4. Among them, the valve core seal 2 is made of engineering plastic or austenitic stainless steel. Such materials have hard plasticity on the surface. Although they have significant advantages in creep resistance and fatigue resistance and can be applied to working conditions of high and low temperatures and strong corrosion, they do not have the performance of plastic deformation and rebound compared with the commonly used rubber-like elastic materials. Therefore, when the internal pressure in the valve body is balanced with the preset spring force, due to the poor resilience of the valve core seal 2, after the safety valve releases overpressure, the flow rate slows down but it is difficult to stop the flow for a long time.

[0028] In this embodiment, the valve core seal 2 is provided on the sealing valve seat 5 that can elastically move along the central axis 0'. After overpressure release, the valve core seal 2 is movably connected to the medium channel 11. Under the action of the sealing valve seat 5, it moves upward to approach the valve flap 4 and make sealing contact with it. That is to say, during the process of the internal pressure release in the valve body, the valve stem 3 drives the valve flap 4 downward, while the sealing valve seat 5 drives the valve core seal 2 upward to compensate for the insufficient resilience of the valve core seal 2, thereby achieving rapid flow stoppage.

[0029] Of course, this sealing compensation structure can also be used in cooperation with a valve core seal 2 having rebound plasticity, and the material selection of the valve core seal 2 can be determined based on the usage requirements.

[0030] Furthermore, the sealing compensation structure further includes:

[0031] A limit bolt 6, threadedly connected to the medium channel 11, which is convenient for disassembly and installation. And the limit bolt 6 is provided with a second channel 61 for the medium to flow through along the central axis 0'. The inlet end of the second channel 61 is set as a hexagonal shape convenient for disassembly, which is convenient for using a hex wrench to achieve disassembly and installation.

[0032] A return spring 7, arranged between the sealing valve seat 5 and the limit bolt 6, and both ends of the return spring 7 are elastically abutted against the limit bolt 6 and the sealing valve seat 5 respectively. The return spring 7 provides a driving force for the sealing valve seat 5. That is, when the internal pressure in the valve body is normal, the return spring 7 is in a compressed state. When the internal pressure in the valve body is released, the sealing valve seat 5 moves upward under the elastic force of the return spring 7, enabling the valve core seal to have the ability of elastic compensation to ensure the flow stoppage effect.

[0033] Furthermore, the sealing valve seat 5 includes a sealing bearing part 52 adapted to the outlet of the medium channel 11 and a guiding part 53 integrally connected to the sealing bearing part 52. At least part of the outer peripheral wall of the sealing bearing part 52 abuts against the inner wall on one side of the outlet of the medium channel 11, and the outer peripheral wall of the guiding part 53 abuts against the inner wall of the medium channel 11 to ensure the stability of the movement process of the sealing valve seat 5, thereby ensuring the sealing reliability between the valve core seal 2 and the valve flap 4.

[0034] A sealing ring 8 is provided between the sealing bearing part 52 and the medium channel 11. Referring to FIG. 2, there are two sealing rings 8, namely a sealing ring with a "square" cross-section and a sealing ring with a "0" cross-section, and the two sealing rings are arranged vertically. The sealing ring with a square cross-section ensures the sealing between the sealing valve seat 5 and the medium channel 11, while the "0" - shaped sealing ring further ensures the sealing and reduces the resistance of the movement of the sealing valve seat 5 to ensure that the sealing valve seat can move upward under the drive of the return spring.

[0035] Furthermore, a receiving groove 521 is provided on one end face of the sealing and bearing portion 52 facing the valve stem 3, and the valve core seal 2 is embedded in the receiving groove 521, so that the valve flap 4, the valve core seal 2, and the sealing valve seat 5 form two sealing contact surfaces, further improving the sealing effect.

[0036] Furthermore, the guiding portion 53 is provided with an upper positioning groove hole 531 adapted to the outer diameter of the return spring 7 along the central axis 0'; the threaded portion of the limit bolt 6 is provided with a lower positioning groove hole 62 adapted to the outer diameter of the return spring 7 along the central axis 0'; the return spring 7 is compressed in the accommodation cavity 9 formed by the upper positioning groove hole 531 and the lower positioning groove hole 62.

[0037] Furthermore, the valve flap 4, the sealing valve seat 5, and the return spring 7 can be made of precipitation hardening stainless steel respectively, so that the safety valve of this embodiment can be applied to working conditions of high and low temperatures and strong corrosion.

[0038] In summary, the safety valve with a sealing compensation structure provided by the present invention is provided with a sealing compensation structure in the medium passage, and the valve core seal is arranged on the sealing compensation structure, so that when it is difficult to quickly stop the flow due to the poor resilience of the valve core seal, the valve core seal is driven to move upward to be close to the valve flap and be in sealing contact with it, thereby realizing quick stop of the flow. The structure is simple, and the sealing process is stable and reliable.

[0039] In the above description, many specific details are set forth in order to fully understand the present invention. However, the above description is only a preferred embodiment of the present invention, and the present invention can be implemented in many other ways different from those described herein. Therefore, the present invention is not limited by the specific embodiments disclosed above. At the same time, any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes. All simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the protection of the technical solution of the present invention.

Claims

1. A safety valve with a seal compensation structure, comprising a valve body (1), a medium passage (11) provided at the bottom of the valve body (1), and a pressure relief passage (12) provided at the side of the valve body (1). A valve core seal (2) is provided at the outlet end of the medium passage (11). A valve stem (3) that moves up and down along the central axis (O’) of the medium passage (11) is provided in the valve body (1). A valve flap (4) that is in sealing contact with the valve core seal (2) to open and close the outlet of the medium passage (11) is provided at the lower end of the valve stem (3). It is characterized in that: The spool seal (2) is arranged in the valve body (1) through a seal compensation structure; The seal compensation structure includes a seal seat (5), which is elastically arranged in the medium passage (11) and is used to make the spool seal (2) rise to seal and contact the valve flap (4). A first passage (51) for the medium to flow through is formed along the central axis (O') on the seal seat (5), and the outlet of the first passage (51) is adapted to the valve flap (4).

2. The safety valve with a seal compensation structure according to claim 1, characterized in that, The seal compensation structure further includes: A limit bolt (6) is threadedly connected to the medium passage (11), and a second passage (61) for the medium to flow through is formed along the central axis (O') on the limit bolt (6); A return spring (7) is arranged between the seal seat (5) and the limit bolt (6), and both ends of the return spring (7) are elastically abutted against the limit bolt (6) and the seal seat (5) respectively.

3. The safety valve with a seal compensation structure according to claim 2, wherein: The seal seat (5) includes a seal bearing part (52) adapted to the outlet of the medium passage (11) and a guiding part (53) integrally connected to the seal bearing part (52). At least part of the outer peripheral wall of the seal bearing part (52) abuts against the inner wall on one side of the outlet of the medium passage (11), and the outer peripheral wall of the guiding part (53) abuts against the inner wall of the medium passage (11); A sealing ring (8) is arranged between the seal bearing part (52) and the medium passage (11).

4. The safety valve with a seal compensation structure according to claim 3, characterized in that: A receiving groove (521) is formed on one side end face of the seal bearing part (52) facing the valve stem (3), and the spool seal (2) is embedded in the receiving groove (521).

5. The safety valve with a seal compensation structure according to claim 4, characterized in that: The guiding part (53) is provided with an upper positioning groove hole (531) adapted to the outer diameter of the return spring (7) along the central axis (O'); a lower positioning groove hole (62) adapted to the outer diameter of the return spring (7) is formed along the central axis (O') on the thread part of the limit bolt (6); The return spring (7) is compressed in the accommodation cavity (9) formed by the upper positioning groove hole (531) and the lower positioning groove hole (62).

6. The safety valve with a seal compensation structure according to claim 2, wherein: The inlet end of the second passage (61) of the limit bolt (6) is set as a hexagonal shape for easy disassembly.

7. The safety valve with a seal compensation structure according to claim 1, characterized in that: The valve flap (4), the seal seat (5), and the return spring (7) are respectively made of precipitation hardening stainless steel; the spool seal (2) is made of engineering plastic or austenitic stainless steel.

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