A sealing structure and a valve having the same

Abstract

The utility model provides a sealing structure and a valve having the same, belonging to the technical field of valve sealing, comprising: a pressure ring and an elastic member, the pressure ring is slidably installed in an installation space between a valve seat and a valve body, a first sealing member for sealing contact with the valve body and a second sealing member for sealing contact with the valve seat are installed on the pressure ring, and the first sealing member and the second sealing member are arranged at intervals; the elastic member is connected to the pressure ring, and the elastic member has an elastic force for driving the pressure ring to squeeze the first sealing member and the second sealing member, the first sealing member and the second sealing member are expanded under force to achieve sealing between the valve body and the valve seat, the interface width of the first sealing member and the second sealing member is smaller, and under the condition of a certain sealing pressure ratio, the elastic force of the elastic member is synchronously reduced, so that the double piston effect is achieved and the air pressure torque of the valve is reduced at the same time; the sealing structure provided by the utility model solves the problem in the prior art that the cross-sectional width of the graphite ring is relatively large, resulting in a relatively large air pressure torque of the valve.

Description

Technical Field

[0001] The utility model relates to the technical field of valve sealing, in particular to a sealing structure and a valve having the same. Background Art

[0002] As valves are used in harsh media conditions such as toxic and polluted media, the requirements for valve sealing and service life are increased. The most commonly used seals for valves are rubber rings, but rubber rings for special conditions are expensive and have limited operating temperatures. Graphite packing has the advantages of high temperature resistance and corrosion resistance, and is low in price. The valve seat needs to have a double piston effect, a single valve seat can cut off the pressure of the media at both ends, and a single valve can achieve double isolation on the pipeline.

[0003] The existing valve seat sealing structure provides preload force through the spring arranged on the valve cover. The preload force of the spring and the force of the medium on the valve seat act together to make the pressure ring exert force on the graphite ring, and the graphite ring expands under the force to achieve sealing between the valve seat and the valve cover.

[0004] However, in the above scheme, the standard requires that the valve should be preloaded by the spring to achieve the double piston effect before installing the pipeline, that is, in the absence of medium, and the graphite ring seal has a certain specific pressure, such as Figure 3 As shown, the cross-sectional width of the graphite ring in the existing valve seat sealing structure is relatively large. When the cross-sectional width is small, the valve is prone to leakage, and the preload force provided by the spring to the graphite ring is also relatively large, which leads to an increase in the air pressure torque of the valve, the strength of the valve transmission chain needs to be strengthened, the actuator specifications are larger, and the cost is increased. Utility Model Content

[0005] Therefore, the technical problem to be solved by the utility model is to overcome the problem in the prior art that the cross-sectional width of the graphite ring is relatively large, resulting in a relatively large air pressure torque of the valve, thereby providing a sealing structure and a valve having the same.

[0006] In order to solve the above technical problems, the utility model provides a sealing structure, which is arranged between a valve seat and a valve body, and there is an installation space between the valve seat and the valve body for installing the sealing structure; the sealing structure includes:

[0007] A pressure ring is slidably mounted in the mounting space, a first sealing member for sealingly contacting the valve body and a second sealing member for sealingly contacting the valve seat are mounted on the pressure ring, and the first sealing member and the second sealing member are spaced apart from each other;

[0008] An elastic member is connected to the pressure ring, and the elastic member has an elastic force for driving the pressure ring to press the first sealing member and the second sealing member.

[0009] Optionally, the first sealing member and the second sealing member are located in the same plane.

[0010] Optionally, a first annular protrusion is provided on the pressure ring, a first positioning groove is formed between the first annular protrusion and the valve body, the first sealing member is arranged in the first positioning groove, a second positioning groove is formed between the first annular protrusion and the valve seat, and the second sealing member is arranged in the second positioning groove.

[0011] Optionally, the pressure ring has two spaced-apart members, namely a first pressure ring and a second pressure ring, and the elastic member is arranged between the first pressure ring and the second pressure ring, and the elastic member has an elastic force for driving the first pressure ring and the second pressure ring to move away from each other.

[0012] Optionally, a second annular protrusion is provided on the second pressure ring, a third positioning groove is formed between the second annular protrusion and the valve body, a third sealing member is provided in the third positioning groove, and the third sealing member is in sealing contact with the valve body, a fourth positioning groove is formed between the second annular protrusion and the valve seat, a fourth sealing member is provided in the fourth positioning groove, and the fourth sealing member is in sealing contact with the valve seat.

[0013] Optionally, the thickness of the first seal and the second seal is smaller than the protruding length of the first annular protrusion, and the thickness of the third seal and the fourth seal is smaller than the protruding length of the second annular protrusion.

[0014] Optionally, a first groove is provided on the valve seat, and the first groove is used to accommodate the first annular protrusion; a second groove is provided on the valve body, and the second groove is used to accommodate the second annular protrusion.

[0015] Optionally, a first guide groove is provided on a side of the first pressure ring close to the elastic member, and a second guide groove is provided on a side of the second pressure ring close to the elastic member, and the first guide groove and the second guide groove are used for inserting and setting the elastic member.

[0016] The utility model provides a valve, comprising a valve core, a valve body, a valve seat and a sealing structure described in any one of the above schemes, wherein the valve seat is embedded in the valve body, the sealing surface of the valve seat contacts the valve core, and the sealing structure is arranged in the installation space between the valve body and the valve seat.

[0017] Optionally, a blocking step is provided on the inner side of the valve body, and the blocking step forms a blocking fit with the end of the valve seat.

[0018] The technical solution of the utility model has the following advantages:

[0019] 1. The sealing structure provided by the utility model has the following characteristics: when the medium flows in any direction, the resultant force in the positive direction of the X-axis generated by the medium on the valve seat, the pressure ring, the elastic member, the first sealing member and the second sealing member is greater than the resultant force in the negative direction of the X-axis. The elastic force of the elastic member pushes the pressure ring to squeeze the first sealing member and the second sealing member. The first sealing member and the second sealing member are forced to expand to achieve the seal between the valve body and the valve seat. The sealing surface of the valve seat is pressed against the valve core to achieve the seal between the valve seat and the valve core. Compared with the above, Figure 3 In the existing sealing structure shown, the first sealing member and the second sealing member on the pressure ring are arranged at intervals, and the interface width is smaller. When the sealing pressure ratio is constant, the elastic force provided by the elastic member is reduced synchronously. In the absence of a medium, the double piston effect is achieved while the air pressure torque of the valve is reduced. The actuator specifications are reduced and the cost is reduced. The sealing structure provided by the utility model solves the problem in the prior art that the cross-sectional width of the graphite ring is relatively large, resulting in a relatively large air pressure torque of the valve.

[0020] 2. In the sealing structure provided by the utility model, the first sealing member and the second sealing member are located in the same plane, which can balance the forces on the first sealing member and the second sealing member, thereby ensuring the sealing between the valve body and the valve seat.

[0021] 3. The sealing structure provided by the utility model uses the first annular protrusion to set the first seal and the second seal at intervals, the first positioning groove limits the first seal, and the second positioning groove limits the second seal to avoid displacement of the first seal and the second seal to affect the sealing.

[0022] 4. The sealing structure provided by the utility model drives the first pressure ring and the second pressure ring to move away from each other through the elastic force of the elastic member, so that the first pressure ring squeezes the first sealing member and the second sealing member. Figure 1 In the existing structure shown, when the medium flows along the positive direction of the X-axis, the combined force generated by the medium on the valve body, valve seat and sealing structure is less than the elastic force of the elastic member, the valve working torque is reduced, the actuator specification selection is reduced, and the cost is reduced.

[0023] 5. In the sealing structure provided by the utility model, the third positioning groove between the second pressure ring and the valve body limits the third sealing member, and the fourth positioning groove between the second pressure ring and the valve seat limits the fourth sealing member. The third sealing member and the fourth sealing member can seal both sides of the second pressure ring, forming a double seal with the first sealing member and the second sealing member, so that the seal between the valve body and the valve seat is more reliable.

[0024] 6. In the sealing structure provided by the utility model, the thickness of the first seal and the second seal is smaller than the protruding length of the first annular protrusion, and the thickness of the third seal and the fourth seal is smaller than the protruding length of the second annular protrusion, which can prevent the first seal, the second seal, the third seal and the fourth seal from shifting.

[0025] 7. In the sealing structure provided by the utility model, the first annular protrusion can be inserted into the first groove so that the first seal and the second seal are fully squeezed, and the second annular protrusion can be inserted into the second groove so that the third seal and the fourth seal are fully squeezed. The first seal, the second seal, the third seal and the fourth seal are expanded under force to achieve sealing between the valve body and the valve seat.

[0026] 8. In the sealing structure provided by the utility model, the elastic member is inserted into the first guide groove and the second guide groove, which can prevent the elastic member from bending or shifting during the force-bearing process, so that the first pressure ring and the second pressure ring are evenly stressed.

[0027] 9. For the valve provided by the utility model, when the medium flows in any direction, the X-axis positive force generated by the medium on the valve seat and the sealing structure is greater than the X-axis negative force, so that the sealing surface of the valve seat is pressed into contact with the valve core, thereby achieving the seal between the valve seat and the valve core, and the first sealing member and the second sealing member of the sealing structure are expanded under the force to achieve the seal between the valve body and the valve seat. Since the above-mentioned sealing structure is adopted, any of the above-mentioned advantages is possessed.

[0028] 10. In the valve provided by the utility model, the blocking step on the valve body blocks the end of the valve seat, thereby limiting the position of the valve seat and preventing the sealing surface of the valve seat from separating from the valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic diagram of an implementation of a sealing structure provided in an embodiment of the utility model;

[0031] Figure 2 for Figure 1 Schematic diagram of the medium flowing along the negative direction of the X-axis;

[0032] Figure 3 A schematic diagram of an existing sealing structure.

[0033] Description of reference numerals:

[0034] 1. Valve seat; 2. Valve body; 3. Elastic member; 4. First pressure ring; 5. First sealing member; 6. Second sealing member; 7. Second pressure ring; 8. Third sealing member; 9. Fourth sealing member; 10. First annular protrusion; 11. Second annular protrusion; 12. First groove; 13. Second groove; 14. First guide groove; 15. Second guide groove; 16. Valve core; 17. Blocking step; 18. Medium. DETAILED DESCRIPTION

[0035] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] This embodiment provides a sealing structure capable of reducing valve torque and cost, and is used for sealing between a valve body 2 and a valve seat 1 .

[0040] like Figure 1 , Figure 2As shown, a specific implementation of a sealing structure provided in this embodiment, the sealing structure is arranged between the valve seat 1 and the valve body 2, and an installation space for installing the sealing structure is provided between the valve seat 1 and the valve body 2, and the sealing structure comprises: a pressure ring and an elastic member 3, the pressure ring is slidably installed in the installation space, and a first sealing member 5 for sealing contact with the valve body 2 and a second sealing member 6 for sealing contact with the valve seat 1 are installed on the pressure ring, and the first sealing member 5 and the second sealing member 6 are arranged at intervals; the elastic member 3 is connected to the pressure ring, and the elastic member 3 has an elastic force for driving the pressure ring to squeeze the first sealing member 5 and the second sealing member 6.

[0041] When in use, when the medium 18 flows in any direction, the resultant force in the positive direction of the X-axis generated by the medium 18 on the valve seat 1, the pressure ring, the elastic member 3, the first seal 5 and the second seal 6 is greater than the resultant force in the negative direction of the X-axis, and the elastic force of the elastic member 3 pushes the pressure ring to squeeze the first seal 5 and the second seal 6, and the first seal 5 and the second seal 6 are forced to expand to achieve the sealing between the valve body 2 and the valve seat 1. Compared with the above Figure 3 In the existing sealing structure shown, the first sealing member 5 and the second sealing member 6 on the pressure ring are arranged at intervals, and the interface width thereof is smaller. Under the condition of a certain sealing pressure ratio, the elastic force provided by the elastic member 3 is simultaneously reduced. In the absence of the medium 18, the double piston effect is achieved while also reducing the air pressure torque of the valve, reducing the specification selection of the actuator and reducing the cost. The sealing structure provided in this embodiment solves the problem in the prior art that the cross-sectional width of the graphite ring is relatively large, resulting in a relatively large air pressure torque of the valve.

[0042] If additional explanation is needed, the first sealing member 5 and the second sealing member 6 are configured as graphite rings. Figure 1 As shown, the direction along the X-axis arrow is the positive direction of the X-axis, and the direction opposite to the X-axis arrow is the negative direction of the X-axis.

[0043] like Figure 1 , Figure 2 As shown, in the sealing structure provided in this embodiment, the first sealing member 5 and the second sealing member 6 are located in the same plane. The forces on the first sealing member 5 and the second sealing member 6 can be balanced to ensure the sealing between the valve body 2 and the valve seat 1. In addition, as an alternative embodiment, the first sealing member 5 and the second sealing member 6 can also be arranged on different planes.

[0044] like Figure 1 , Figure 2As shown, in the sealing structure provided in this embodiment, a first annular protrusion 10 is provided on the pressure ring, a first positioning groove is formed between the first annular protrusion 10 and the valve body 2, the first sealing member 5 is arranged in the first positioning groove, a second positioning groove is formed between the first annular protrusion 10 and the valve seat 1, and the second sealing member 6 is arranged in the second positioning groove. The first annular protrusion 10 enables the first sealing member 5 and the second sealing member 6 to be arranged at intervals, the first positioning groove limits the first sealing member 5, and the second positioning groove limits the second sealing member 6 to prevent the first sealing member 5 and the second sealing member 6 from shifting and affecting the sealing performance. In addition, as an alternative embodiment, the annular protrusion can be omitted, and the first sealing member 5 and the second sealing member 6 can be fixed to the pressure ring by gluing or other methods.

[0045] like Figure 1 , Figure 2 As shown, in the sealing structure provided in this embodiment, the pressure ring has two spaced apart, namely, a first pressure ring 4 and a second pressure ring 7, and the elastic member 3 is arranged between the first pressure ring 4 and the second pressure ring 7, and the elastic member 3 has an elastic force for driving the first pressure ring 4 and the second pressure ring 7 to move away from each other. The elastic force of the elastic member 3 drives the first pressure ring 4 and the second pressure ring 7 to move away from each other, so that the first pressure ring 4 squeezes the first sealing member 5 and the second sealing member 6. Figure 1 In the existing structure shown, when the medium 18 flows along the positive direction of the X-axis, the combined force generated by the medium 18 on the valve body 2, the valve seat 1 and the sealing structure is less than the elastic force of the elastic member 3, the valve working torque is reduced, the actuator specification selection is reduced, and the cost is reduced. In addition, as an alternative embodiment, the pressure ring can also be provided with one, and the end of the elastic member 3 away from the pressure ring is provided on the valve seat 1.

[0046] like Figure 1 , Figure 2As shown, in the sealing structure provided in this embodiment, a second annular protrusion 11 is provided on the second pressure ring 7, a third positioning groove is formed between the second annular protrusion 11 and the valve body 2, a third sealing member 8 is provided in the third positioning groove, and the third sealing member 8 is in sealing contact with the valve body 2, and a fourth positioning groove is formed between the second annular protrusion 11 and the valve seat 1, a fourth sealing member 9 is provided in the fourth positioning groove, and the fourth sealing member 9 is in sealing contact with the valve seat 1. The third positioning groove between the second pressure ring 7 and the valve body 2 limits the third sealing member 8, and the fourth positioning groove between the second pressure ring 7 and the valve seat 1 limits the fourth sealing member 9. The third sealing member 8 and the fourth sealing member 9 can seal both sides of the second pressure ring 7, and form a double seal with the first sealing member 5 and the second sealing member 6, so that the seal between the valve body 2 and the valve seat 1 is more reliable. In addition, as an alternative implementation, the second annular protrusion 11 can be omitted, and the third sealing member 8 and the fourth sealing member 9 are fixed to the second pressure ring 7 by gluing or the like.

[0047] like Figure 1 , Figure 2 As shown, in the sealing structure provided by this embodiment, the thickness of the first seal 5 and the second seal 6 is less than the protruding length of the first annular protrusion 10, and the thickness of the third seal 8 and the fourth seal 9 is less than the protruding length of the second annular protrusion 11. It is possible to prevent the first seal 5, the second seal 6, the third seal 8 and the fourth seal 9 from shifting. In addition, as an alternative embodiment, the thickness of the first seal 5 and the second seal 6 is greater than the protruding length of the first annular protrusion 10, and the thickness of the third seal 8 and the fourth seal 9 is greater than the protruding length of the second annular protrusion 11.

[0048] like Figure 1 , Figure 2As shown, in the sealing structure provided in this embodiment, the valve seat 1 is provided with a first groove 12, and the first groove 12 is used to accommodate the first annular protrusion 10, and the valve body 2 is provided with a second groove 13, and the second groove 13 is used to accommodate the second annular protrusion 11. The first annular protrusion 10 can be inserted into the first groove 12, so that the first seal 5 and the second seal 6 are fully squeezed, and the second annular protrusion 11 can be inserted into the second groove 13, so that the third seal 8 and the fourth seal 9 are fully squeezed, and the first seal 5, the second seal 6, the third seal 8 and the fourth seal 9 are expanded by force to achieve the sealing between the valve body 2 and the valve seat 1. In addition, as an alternative embodiment, the first groove 12 and the second groove 13 can be omitted, the thickness of the first seal 5 and the second seal 6 is greater than the protruding length of the first annular protrusion 10, and the thickness of the third seal 8 and the fourth seal 9 is greater than the protruding length of the second annular protrusion 11.

[0049] like Figure 1 , Figure 2 As shown, in the sealing structure provided in this embodiment, a first guide groove 14 is provided on the side of the first pressure ring 4 close to the elastic member 3, and a second guide groove 15 is provided on the side of the second pressure ring 7 close to the elastic member 3, and the first guide groove 14 and the second guide groove 15 are used to insert and set the elastic member 3. The elastic member 3 is inserted into the first guide groove 14 and the second guide groove 15, which can prevent the elastic member 3 from bending or shifting during the force-bearing process, so that the first pressure ring 4 and the second pressure ring 7 are evenly stressed. In addition, as an alternative embodiment, the first groove 12 and the second groove 13 can be omitted, and the elastic member 3 is fixedly connected to the first pressure ring 4 and the second pressure ring 7.

[0050] Directions:

[0051] like Figure 1 As shown, the sealing structure provided in this embodiment, when in use, when the medium 18 flows in any direction, the resultant force of the medium 18 on the valve seat 1, the pressure ring, the elastic member 3, the first seal 5 and the second seal 6 in the positive direction of the X-axis is greater than the resultant force in the negative direction of the X-axis, the elastic member 3 drives the first pressure ring 4 and the second pressure ring 7 to move away from each other, the first annular protrusion 10 is inserted into the first groove 12, the first seal 5 and the second seal 6 are squeezed, the second annular protrusion 11 is inserted into the second groove 13, the third seal 8 and the fourth seal 9 are squeezed, and the first seal 5, the second seal 6, the third seal 8 and the fourth seal 9 are expanded under force to achieve sealing between the valve body 2 and the valve seat 1.

[0052] In addition, if Figure 2 , Figure 3 As shown, this embodiment also provides a valve, including a valve core 16, a valve body 2, a valve seat 1 and the sealing structure described in the above embodiment, wherein the valve seat 1 is embedded in the valve body 2, the sealing surface of the valve seat 1 contacts the valve core 16, and the sealing structure is arranged in the installation space between the valve body 2 and the valve seat 1. When the medium 18 flows in any direction, the X-axis positive force generated by the medium 18 on the valve seat 1 and the sealing structure is greater than the X-axis negative force, so that the sealing surface of the valve seat 1 contacts the valve core 16, and the sealing between the valve seat 1 and the valve core 16 is achieved, and the first sealing member 5 and the second sealing member 6 of the sealing structure are expanded under force to achieve the sealing between the valve body 2 and the valve seat 1.

[0053] like Figure 2 , Figure 3 As shown, in the valve provided in this embodiment, a blocking step 17 is provided on the inner side of the valve body 2, and the blocking step 17 forms a blocking fit with the end of the valve seat 1. The blocking step 17 on the valve body 2 blocks the end of the valve seat 1, thereby limiting the position of the valve seat 1 and preventing the sealing surface of the valve seat 1 from separating from the valve core 16. Specifically, the transition portion of the blocking step 17 is set as an inclined surface.

[0054] It is necessary to add that, if Figure 1 As shown, the medium 18 flows along the positive direction of the X-axis, and the medium 18 generates a positive force F1 on the valve seat 1, the elastic member 3, the first seal 5, the second seal 6, the third seal 8 and the fourth seal 9 on the X-axis. The medium 18 generates a negative force F2 on the valve seat 1, the elastic member 3, the first seal 5, the second seal 6, the third seal 8 and the fourth seal 9. The positive sealing force F in the X-axis direction on the valve seat 1, the elastic member 3, the first seal 5, the second seal 6, the third seal 8 and the fourth seal 9 is F=F1-F2>0, the first seal 5, the second seal 6, the third seal 8 and the fourth seal 9 are expanded under the force to achieve the sealing between the valve seat 1 and the valve body 2, and the valve seat 1 is forced to lean against the valve core 16 to achieve the sealing between the valve seat 1 and the valve core 16.

[0055] like Figure 2 As shown, the medium 18 flows along the negative direction of the X-axis, the X-positive force generated by the medium 18 on the valve seat 1 is F3, the X-negative force generated by the medium 18 on the valve seat 1 is F4, the X-positive sealing force F on the valve seat 1 is F=F3-F4>0, the first sealing member 5, the second sealing member 6, the third sealing member 8 and the fourth sealing member 9 are subjected to the X-negative force F4, and expand under the force to achieve the sealing between the valve seat 1 and the valve body 2, and the valve seat 1 is forced to lean against the valve core 16 to achieve the sealing between the valve seat 1 and the valve core 16.

[0056] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the present utility model.

Claims

1. A sealing structure, arranged between a valve seat (1) and a valve body (2), wherein there is an installation space between the valve seat (1) and the valve body (2) for installing the sealing structure; characterized in that: The sealing structure comprises: A pressure ring is slidably mounted in the mounting space, a first sealing member (5) for sealingly contacting the valve body (2) and a second sealing member (6) for sealingly contacting the valve seat (1) are mounted on the pressure ring, and the first sealing member (5) and the second sealing member (6) are spaced apart from each other; An elastic member (3) is connected to the pressure ring, and the elastic member (3) has an elastic force for driving the pressure ring to press the first sealing member (5) and the second sealing member (6).

2. The sealing structure according to claim 1, characterized in that: The first sealing member (5) and the second sealing member (6) are located in the same plane.

3. The sealing structure according to claim 2, characterized in that: A first annular protrusion (10) is provided on the pressure ring, a first positioning groove is formed between the first annular protrusion (10) and the valve body (2), the first sealing member (5) is arranged in the first positioning groove, a second positioning groove is formed between the first annular protrusion (10) and the valve seat (1), and the second sealing member (6) is arranged in the second positioning groove.

4. The sealing structure according to claim 3, characterized in that: The pressure ring has two spaced-apart portions, namely a first pressure ring (4) and a second pressure ring (7). The elastic member (3) is arranged between the first pressure ring (4) and the second pressure ring (7). The elastic member (3) has an elastic force for driving the first pressure ring (4) and the second pressure ring (7) to move away from each other.

5. The sealing structure according to claim 4, characterized in that: A second annular protrusion (11) is provided on the second pressure ring (7), a third positioning groove is formed between the second annular protrusion (11) and the valve body (2), a third sealing member (8) is provided in the third positioning groove, and the third sealing member (8) is in sealing contact with the valve body (2), a fourth positioning groove is formed between the second annular protrusion (11) and the valve seat (1), a fourth sealing member (9) is provided in the fourth positioning groove, and the fourth sealing member (9) is in sealing contact with the valve seat (1).

6. The sealing structure according to claim 5, characterized in that: The thickness of the first seal (5) and the second seal (6) is smaller than the protruding length of the first annular protrusion (10), and the thickness of the third seal (8) and the fourth seal (9) is smaller than the protruding length of the second annular protrusion (11).

7. The sealing structure according to claim 6, characterized in that: The valve seat (1) is provided with a first groove (12), the first groove (12) being used to accommodate the first annular protrusion (10), and the valve body (2) is provided with a second groove (13), the second groove (13) being used to accommodate the second annular protrusion (11).

8. The sealing structure according to any one of claims 4 to 7, characterized in that: A first guide groove (14) is provided on a side of the first pressure ring (4) close to the elastic member (3), and a second guide groove (15) is provided on a side of the second pressure ring (7) close to the elastic member (3). The first guide groove (14) and the second guide groove (15) are used for inserting and setting the elastic member (3).

9. A valve, characterized in that: It comprises a valve core (16), a valve body (2), a valve seat (1) and a sealing structure as described in any one of claims 1 to 8, wherein the valve seat (1) is embedded in the valve body (2), the sealing surface of the valve seat (1) is in contact with the valve core (16), and the sealing structure is arranged in the installation space between the valve body (2) and the valve seat (1).

10. The valve according to claim 9, characterized in that A blocking step (17) is provided on the inner side of the valve body (2), and the blocking step (17) forms a blocking fit with the end of the valve seat (1).

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