An isostress clamping ring and a ball valve seat assembly having the clamping ring

Abstract

The present invention discloses an isostress clamp and a ball valve seat assembly having the clamp. The isostress clamp comprises: a body, which is elastic. Cards are respectively arranged at both ends of the body, and the two cards contact each other to form a circular fastening area. The distance between any point on the body and the contact points at both ends of the body is the force arm a, and the cross-sectional width corresponding to the point is the bending-resistant cross-sectional width b, which increases with the increase of the force arm a. It ensures that the clamp is subjected to uniform force during the process of pulling the clamp outward or pressing the clamp inward, avoids the existence of local stress points in the clamp, prolongs the service life of the clamp, and enhances the reliability of the clamp. In addition, the clamp has a simple structure, and the valve seat assembly is fixed by the clamp, which facilitates the assembly and disassembly of the valve seat assembly.

Description

Technical Field

[0001] The invention relates to the technical field of valve seat assemblies, and in particular to an isostress clamping ring and a ball valve seat assembly having the clamping ring. Background Art

[0002] The top-entry ball valve can be disassembled easily and quickly on the pipeline, and the maintenance is convenient and quick. When the valve fails on the pipeline and needs to be repaired, it is not necessary to disassemble the valve from the pipeline. You only need to remove the bolts and nuts of the middle flange, remove the valve cover and valve stem assembly from the valve body, and then take out the ball and valve seat assembly. The ball and valve seat can be repaired online. This maintenance saves time and minimizes the loss in production.

[0003] In the prior art, the elastic seat of the top-entry ball valve is fixed by a chain structure, which is composed of a chain, a chain plate, a chain joint, a spring washer and a screw. Since the chain structure has many parts and the installation process is very complicated, the assembly and disassembly time of the valve seat assembly is relatively long. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problem in the prior art that the valve seat assembly takes a long time to assemble and disassemble due to the large number of chain structure parts.

[0005] To this end, the present invention provides an isostress clamping ring, comprising:

[0006] The body is elastic, and cards are respectively arranged at both ends of the body; the two cards contact each other to form a circular fastening area; the distance between any point on the body and the contact points at both ends of the body is the force arm a; the cross-sectional width corresponding to the point is the bending cross-sectional width b;

[0007] The bending-resistant section width b increases as the force arm a increases.

[0008] Furthermore, the relationship between the bending section width b and the force arm a is a formula, and the formula is:

[0009] b=0.00003a 2 +0.0088a+6.12.

[0010] Furthermore, the thickness of the body at any position is the same.

[0011] Furthermore, at least one through hole is provided on any of the cards.

[0012] Furthermore, the end of the card is chamfered.

[0013] A ball valve seat assembly having an isostress retaining ring, comprising:

[0014] A retainer is suitable for being arranged between the valve body and the ball, and a sealing ring is arranged on one side of the retainer to press against the ball; the retainer is arranged in a stepped shaft, and the retainer includes a first stepped groove and a second stepped groove, and a flooded ring is arranged between the first stepped groove and the valve body;

[0015] A fixing seat is coaxially sleeved on the second stepped groove; a mounting groove is provided on the fixing seat, suitable for assembling at least one elastic member; any of the elastic members applies an elastic force toward the sphere to the fixing device; a clamping groove is provided on the fixing seat;

[0016] The clamping ring is clamped in the clamping groove; and the two clamping cards are clamped on the protruding part of the valve body.

[0017] Furthermore, a first embedding groove is provided on a sealing surface of the fixture close to the sphere, and the sealing ring is embedded in the first embedding groove.

[0018] Furthermore, it also includes fire-proof graphite, which is arranged between the fixer and the valve body.

[0019] Furthermore, a second embedding groove is provided on the fixture, and the fireproof graphite is embedded in the second embedding groove.

[0020] Furthermore, a plurality of the elastic members are arranged in a circular array in the installation groove.

[0021] The technical solution of the present invention has the following advantages:

[0022] 1. The isostress clamp provided by the present invention comprises: a body, which is elastic. Cards are respectively arranged at both ends of the body, and the two cards contact each other to form a circular fastening area. The distance between any point on the body and the contact points at both ends of the body is the force arm a, and the cross-sectional width corresponding to the point is the bending cross-sectional width b, and the bending cross-sectional width b increases with the increase of the force arm a.

[0023] This clamp ring is a disconnecting clamp ring with elasticity. The width b of the bending section of the clamp ring increases with the increase of the force arm a, ensuring that the clamp ring is evenly stressed during the process of pulling outward or pressing inward, avoiding the existence of local stress points in the clamp ring, extending the service life of the clamp ring, and enhancing the reliability of the clamp ring. In addition, the clamp ring has a simple structure, and the use of the clamp ring to fix the valve seat assembly facilitates the assembly and disassembly of the valve seat assembly.

[0024] 2. For the isostress clamp provided by the present invention, the relationship between the bending section width b and the force arm a is b=0.00003a 2 +0.0088a+6.12, ensures uniform force on the snap ring and extends the service life of the snap ring.

[0025] 3. The iso-stress clamp provided by the present invention has at least one through hole on the card, so that the operator can use a tool to pass through the through hole to pull open the clamp.

[0026] 4. In the iso-stress clamping ring provided by the present invention, the end of the card is chamfered to prevent the card from scratching the clamping piece between the two cards.

[0027] 5. The ball valve seat assembly provided by the present invention has a clamping ring with equal stress, and also includes: a fixer and a fixing seat, the fixer is arranged between the valve body and the ball, and a sealing ring is arranged at the position where the fixer and the ball are pressed against each other. The fixer is arranged in a stepped shaft, and the fixer includes a first stepped groove and a second stepped groove, and a universal plug ring is arranged between the first stepped groove and the valve body. The fixing seat is coaxially sleeved on the second stepped groove, and an installation groove is arranged on the fixing seat, and at least one elastic member is assembled in the installation groove. The elastic member applies an elastic force to the fixer in the direction of the ball. The clamping ring is clamped in the clamping groove of the fixing seat, and two clamps are clamped in the protruding part of the valve body.

[0028] The ball valve seat assembly has a simple clamping ring structure. The protruding part of the valve body and the clamping ring are clamped in the clamping groove of the fixed seat to fix the valve seat assembly, which is convenient for assembly and disassembly of the valve seat assembly. In addition, the clamping ring with equal stress is evenly stressed when being pulled outward or pressed inward, which prolongs the service life of the ball valve.

[0029] 6. The ball valve seat assembly provided by the present invention also includes fire-proof graphite, which is arranged between the fixer and the valve body to isolate the upstream and downstream of the pipeline and play a role in fire prevention.

[0030] 7. In the ball valve seat assembly provided by the present invention, a plurality of elastic members are arranged in a circular array in the mounting groove to ensure that all parts of the retainer are evenly subjected to the elastic force of the elastic members, and further ensure that all parts of the clamping ring are evenly subjected to force. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 This is a cross-sectional schematic diagram of a clamping ring with medium stress in a ball valve according to Example 1 of the present invention;

[0033] Figure 2 It is an enlarged cross-sectional schematic diagram of a valve seat assembly in a clamp ring with medium stress in Example 1 of the present invention;

[0034] Figure 3 It is a schematic plan view of a clamping ring in a clamping ring with medium stress in Example 1 of the present invention;

[0035] Figure 4It is a schematic diagram of the structure of the cooperation between the clamping ring and the elastic member seat in the clamping ring with medium stress in Example 1 of the present invention;

[0036] Figure 5 It is a plan view of a clamping ring in a clamping ring with medium stress in Example 1 of the present invention;

[0037] Figure 6 is the linear graph of clasps a and b.

[0038] Description of reference numerals:

[0039] 1. Valve body; 2. Ball;

[0040] 3. Valve seat assembly; 301. Fixer; 302. Fixed seat; 303. Elastic member; 304. Sealing ring; 305. Fireproof graphite; 306. Pan plug ring; 307. Snap ring; 3072. Card; 3073. Through hole. DETAILED DESCRIPTION

[0041] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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.

[0042] 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" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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.

[0044] 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.

[0045] Example 1

[0046] This embodiment provides a clamping ring with equal stress, such as Figure 3-5 As shown, it includes: a body, which is elastic. Cards 3072 are respectively arranged at both ends of the body, and the two cards 3072 contact each other to form a circular fastening area. The distance between any point on the body and the contact points at both ends of the body is the force arm a, and the cross-sectional width corresponding to the point is the bending cross-sectional width b, and the bending cross-sectional width b increases with the increase of the force arm a.

[0047] This clamping ring is used to disconnect the elastic clamping ring 307. The bending section width b of the clamping ring 307 increases with the increase of the force arm a, ensuring that the clamping ring 307 is evenly stressed during the process of being pulled outward or pressed inward, avoiding the existence of local stress points in the clamping ring 307, extending the service life of the clamping ring 307, and enhancing the reliability of the clamping ring 307. In addition, the clamping ring 307 has a simple structure, and the use of the clamping ring 307 to fix the valve seat assembly 3 facilitates the assembly and disassembly of the valve seat assembly 3.

[0048] Specifically, Figure 6 As shown, the relationship between the bending section width b and the force arm a is:

[0049] b=0.00003a 2 +0.0088a+6.12,

[0050] Ensure that the force on the snap ring 307 is uniform and extend the service life of the snap ring 307. For example, the common sizes of the snap ring 307 in the ball valve are 14 inches and 16 inches.

[0051] When the retaining ring 307 is 14 inches, the actual measured values ​​of a and b (due to manufacturing and other reasons, there will be a certain error between the actual measured value and the calculated value): a is 99.155, b is 7.492 (the actual calculated value is 7.287); a is 150.64, b is 8.133 (the actual calculated value is 8.126); a is 298.045, b is 11.454 (the actual calculated value is 11.407); a is 398.142, b is 14.999 (the actual calculated value is 14.379); a is 437.999, b is 16 (the actual calculated value is 15.729).

[0052] When the retaining ring 307 is 16 inches, the actual measured values ​​of a and b (due to manufacturing and other reasons, there will be a certain error between the actual measured value and the calculated value): a is 151.987, b is 8.05 (the actual calculated value is 8.15); a is 201.285, b is 8.909 (the actual calculated value is 9.106); a is 329.158, b is 11.949 (the actual calculated value is 12.266); a is 432.174, b is 15.582 (the actual calculated value is 15.526); a is 482.999, b is 17 (the actual calculated value is 17.368).

[0053] Specifically, Figure 4 As shown, the thickness of the snap ring 307 at any position is the same, which is convenient for manufacturing the snap ring 307 and ensures that each part of the snap ring 307 is evenly stressed.

[0054] Specifically, Figure 3-Figure 5 As shown, at least one through hole 3073 is provided on the card 3072, so that the operator can use a tool to pass through the through hole 3073 to pull open the clamp ring 307. The through hole 3073 can be a circular hole, and the through holes 3073 on the two cards 3072 can be symmetrically arranged.

[0055] Specifically, Figure 3 As shown, the ends of the cards 3072 are chamfered to prevent the cards 3072 from scratching the clamping member between the two cards 3072. For example, the cards 3072 are clamped on the protruding portion of the valve body 1, and the ends of the cards 3072 are chamfered to prevent the ends of the cards 3072 from scratching the protruding portion of the valve body 1.

[0056] like Figure 1 , Figure 2 and Figure 4 As shown, this embodiment also provides a ball valve seat assembly 3, which has a clamping ring with equal stress, and also includes: a retainer 301 and a fixed seat 302, wherein the retainer 301 is arranged between the valve body 1 and the ball 2, and a sealing ring 304 is arranged at the position where the retainer 301 and the ball 2 are pressed against each other. The retainer 301 is arranged in a stepped shaft, and the retainer 301 includes a first stepped groove and a second stepped groove, and a pan-seal ring 306 is arranged between the first stepped groove and the valve body 1. The fixed seat 302 is coaxially sleeved on the second stepped groove, and an installation groove is arranged on the fixed seat 302, and at least one elastic member 303 is assembled in the installation groove. The elastic member 303 applies an elastic force to the retainer 301 in the direction of the ball 2. The clamping ring 307 is clamped in the clamping groove of the fixed seat 302, and two clamps 3072 are clamped in the protruding part of the valve body 1.

[0057] The valve seat assembly 3 of the ball valve and the clamping ring 307 have a simple structure. The protrusion of the valve body 1 is clamped by the card 3072 and the clamping ring 307 is clamped in the clamping groove of the fixing seat 302, so as to fix the valve seat assembly 3 and facilitate the assembly and disassembly of the valve seat assembly 3. In addition, the clamping ring with equal stress is evenly stressed when being pulled outward or pressed inward, thereby extending the service life of the ball valve.

[0058] Specifically, Figure 2 As shown, a first embedding groove is provided on the sealing surface of the holder 301 close to the ball 2, and a sealing ring 304 is embedded in the first embedding groove to ensure the sealing performance of the contact between the ball 2 and the holder 301.

[0059] Specifically, Figure 2As shown, fireproof graphite 305 is also included, which is arranged between the fixer 301 and the valve body 1 to isolate the upstream and downstream of the pipeline and play a role in fire prevention.

[0060] Specifically, Figure 2 As shown, a second embedding groove is provided on the fixture 301, and the fireproof graphite 305 is embedded in the second embedding groove.

[0061] Specifically, a plurality of elastic members 303 are arranged in a circular array in the installation groove to ensure that each part of the fixer 301 is evenly subjected to the elastic force of the elastic members 303 , and further ensure that each part of the clamping ring 307 is evenly subjected to force.

[0062] When assembling the ball valve seat assembly 3, if Figure 2 As shown, first, the sealing ring 304 is embedded in the first embedding groove, the fireproof graphite 305 is embedded in the second embedding groove, and the universal seal ring 306 is installed on the fixture 301. Then the elastic member 303 is placed in the installation groove, and the fixing seat 302 is coaxially sleeved on the fixing seat 301. The clamping ring 307 is sleeved on the fixing seat 302. The universal seal ring 306 is assembled to the bottom of the valve body 1, and the ball 2 is placed in the valve body 1 in the open position, and then the ball 2 is adjusted to the closed position. The valve seat assembly 3 is pulled to the sealing surface of the ball 2, and finally the clamping ring 307 is clamped in the clamping groove. The two clamps 3072 of the clamping ring 307 clamp the protruding part of the valve body 1, and the assembly of the valve seat assembly 3 is completed.

[0063] When disassembling the ball valve seat assembly 3, Figure 2 As shown, first take out the retaining ring 307 from the retaining groove of the fixing seat 302 and put it on the edge of the fixing seat 302, then take out the ball 2 from the valve body 1, and finally take out the remaining parts together to complete the disassembly of the valve seat assembly 3.

[0064] As a first replaceable implementation of Example 1, the through hole 3073 on the card 3072 can also be other shapes. For example, the through hole 3073 can be a square, a rhombus, a regular pentagon, etc., so that a tool can be hooked on the through hole 3073 to pull the card 3072.

[0065] As a second alternative implementation of Example 1, the through hole 3073 may not be provided on the card 3072, and anti-slip stripes may be provided on the card 3072. A clamping tool may be used to clamp the anti-slip stripes of the two cards 3072 to pull the two cards 3072 apart.

[0066] 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 therefrom are still within the scope of protection of the invention.

Claims

1. A ball valve seat assembly, characterized in that: Isostatic clamping ring, including: A retainer (301) is suitable for being arranged between the valve body (1) and the ball (2), and a sealing ring (304) is arranged on one side of the retainer (301) to press against the ball (2); the retainer (301) is arranged in the form of a stepped shaft, and the retainer (301) comprises a first stepped groove and a second stepped groove, and a pan-seal ring (306) is arranged between the first stepped groove and the valve body (1); A fixing seat (302) is coaxially sleeved on the second stepped groove; a mounting groove is provided on the fixing seat (302) and is suitable for assembling at least one elastic member (303); any of the elastic members (303) applies an elastic force to the fixture (301) in the direction of the sphere (2); a clamping groove is provided on the fixing seat (302); A clamping ring (307) is clamped in the clamping groove; two clamping cards (3072) are clamped on the protruding portion of the valve body (1); The isostress clamping ring comprises: The body is elastic, and cards (3072) are respectively arranged at both ends of the body; the two cards (3072) contact each other to form a circular fastening area; the distance between any point on the body and the contact points at both ends of the body is the force arm a; the cross-sectional width corresponding to the point is the bending cross-sectional width b; The bending-resistant section width b increases as the force arm a increases.

2. The ball valve seat assembly according to claim 1, characterized in that: The relationship between the bending section width b and the force arm a is expressed by formula (1), which is: b = 0.00003a2+0.0088a+6.12 (1).

3. The ball valve seat assembly according to claim 2, characterized in that: The thickness of the body is the same at any position.

4. The ball valve seat assembly according to claim 3, characterized in that: At least one through hole (3073) is provided on any of the cards (3072).

5. The ball valve seat assembly according to claim 4, characterized in that: The end of the card (3072) is chamfered.

6. The ball valve seat assembly according to claim 1, characterized in that: A first embedding groove is provided on the sealing surface of the fixer (301) close to the spherical body (2), and the sealing ring (304) is embedded in the first embedding groove.

7. The ball valve seat assembly according to claim 1, characterized in that: It also includes fireproof graphite (305) which is arranged between the fixer (301) and the valve body (1).

8. The ball valve seat assembly according to claim 7, characterized in that: The fixer (301) is also provided with a second embedding groove, and the fireproof graphite (305) is embedded in the second embedding groove.

9. The ball valve seat assembly according to claim 1, characterized in that: A plurality of elastic members (303) are arranged in a circular array in the installation groove.

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