Valve seat structure and valve

Abstract

The utility model belongs to the technical field of valves, and particularly discloses a valve seat structure which is installed on a valve body of a valve, a valve element is arranged in the valve, the valve seat structure comprises a supporting sleeve, and the supporting sleeve is detachably connected with the valve body. The sealing piece is detachably connected to the end, close to the valve element, of the supporting sleeve, and the sealing piece and the sealing face of the valve element can form a sealing pair; a limiting assembly is arranged between the valve body and the supporting sleeve, the limiting assembly is used for fixing the supporting sleeve, and the utility model further provides a valve which comprises the valve seat structure. By means of the arranged valve seat structure, the sealing piece can be fixed, even under the low-temperature condition, the valve seat structure and the sealing piece are not prone to disengagement, the valve seat structure and the valve element can achieve good sealing, normal closing can be achieved under the condition of long-time use, and the stability of the valve during operation is guaranteed.

Description

Technical Field

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

[0002] A cryogenic ball valve is a ball valve specially designed for low-temperature environments. It is usually made of low-temperature materials and can maintain good sealing performance and operation flexibility at extremely low temperatures. Cryogenic ball valves are commonly used in control and transportation systems for cryogenic media such as liquefied natural gas (LNG), liquid nitrogen, and liquid oxygen. They have the characteristics of good sealing performance, high reliability, and long service life, and can ensure safe and reliable operation in extremely low-temperature environments.

[0003] In the prior art, the valve seat component of an eccentric top-mounted cryogenic ball valve adopts a structural design of a non-metallic sealing ring + an inlaid metal support sleeve + rolling fixation. This structure has potential hazards. When this valve is used in low-temperature working conditions, the shrinkage of the non-metallic sealing ring is greater than that of the metal support sleeve, which will cause the risk of the non-metallic sealing ring loosening and leaking or coming off, resulting in the failure of the valve to close properly or leak. Summary of the Utility Model

[0004] In view of the above-mentioned disadvantages of the prior art, one of the purposes of the present utility model is to provide a valve seat structure to solve the problem of loosening of the non-metallic sealing ring in the valve seat structure of a ball valve in the prior art, and the second purpose is to provide a valve.

[0005] To achieve the above purposes and other related purposes, the present utility model provides a valve seat structure installed on the valve body of a valve. A valve core is provided inside the valve. The valve seat structure includes:

[0006] A support sleeve, which is detachably connected to the valve body;

[0007] A seal, which is detachably connected to one end of the support sleeve close to the valve core, and the seal can form a sealing pair with the sealing surface of the valve core;

[0008] A limiting component is provided between the valve body and the support sleeve, and the limiting component is used to fix the support sleeve.

[0009] Optionally, an installation groove is opened at one end of the support sleeve close to the valve core, and a fixing component is provided in the installation groove. The seal is detachably connected to the installation groove through the fixing component.

[0010] Optionally, the installation groove includes a first step, a second step, and a third step that are continuously arranged. One end of the seal away from the valve core abuts against the first step. The side wall of the seal is provided with a sealing flange. The second step is provided with a sealing water line corresponding to the sealing flange. The fixing assembly is arranged on the third step, and the fixing assembly can be used to press the seal against the second step.

[0011] Optionally, it includes a retaining ring and a connecting piece. The retaining ring is arranged on the third step. The connecting piece passes through the retaining ring and is detachably connected to the valve body. The retaining ring is provided with a pressing part. The pressing part corresponds to the sealing flange and can be used to press the sealing flange into the sealing water line.

[0012] Optionally, a sealing ring is provided between the support sleeve and the valve body.

[0013] Optionally, a connecting groove is formed on the outer side of the valve body where the support sleeve is located, and the limiting assembly is arranged in the connecting groove.

[0014] Optionally, the limiting assembly includes a retaining ring and a limiting piece. The retaining ring is arranged in the connecting groove and is threadedly connected to the valve body. The limiting piece has a limiting part. The support sleeve is provided with a protruding part. The limiting part can be used to clamp the protruding part to fix the support sleeve on the valve body.

[0015] Optionally, a limiting groove is formed on the side wall of the retaining ring. The limiting piece is threadedly connected to the valve body, and the free end of the limiting piece penetrates into the valve body and is located in the limiting groove.

[0016] Optionally, a preloading spring is provided between the valve body and the support sleeve.

[0017] The present utility model further provides a valve, which includes a valve body, a valve cover, and the above-mentioned valve seat structure, and a valve core is arranged in the valve body.

[0018] As described above, a valve seat structure and a valve proposed by the present utility model have the following beneficial effects:

[0019] (1) Compared with the prior art, by arranging a seal, the present utility model can form a seal pair with the sealing surface of the valve core. At the same time, the seal is installed on the support sleeve in a detachable connection manner and cooperates with the valve core to form a firm sealing structure. Under low-temperature working conditions, even if the parts shrink, sealing can still be achieved, and the seal will not fall off or become loose, improving the sealing effect and ensuring that the valve can be normally closed.

[0020] (2) Compared with the prior art, in the present utility model, through the provided limiting component, the valve seat is fixed on the valve body by the limiting component. At the same time, due to the provided limiting component, the valve seat has a slight moving distance, so that it can avoid the problem that the sealing surface is damaged due to the rapid rubbing of the valve core, resulting in the valve being unable to close normally. Description of the Drawings

[0021] Figure 1 It shows a cross-sectional view of an embodiment of the present utility model;

[0022] Figure 2 It shows a schematic structural view of the valve seat structure in an embodiment of the present utility model;

[0023] Figure 3 It shows an enlarged view of part A in an embodiment of the present utility model;

[0024] Figure 4 It shows a schematic structural view of the installation groove in an embodiment of the present utility model;

[0025] Figure 5 It shows a schematic structural view of the sealing member in an embodiment of the present utility model;

[0026] Figure 6 It shows a schematic structural view of the valve seat structure and the limiting component in an embodiment of the present utility model;

[0027] Figure 7 It shows a schematic structural view of the valve core in an embodiment of the present utility model;

[0028] Figure 8 It shows a top view of the valve core in an embodiment of the present utility model.

[0029] Description of the Reference Numerals:

[0030] Valve body 1, valve cover 2, valve core 3, "O"-shaped flow channel 301, first sealing surface 301, lower bearing 4, upper bearing 5, valve stem 6, support sleeve 7, protruding part 701, sealing member 8, sealing flange 801, second sealing surface 802, pressing ring 9, pressing part 10, installation groove 11, first step 1101, second step 1102, sealing water line 1103, third step 1104, sealing ring 12, connecting groove 13, retaining ring 14, limiting part 1401, limiting groove 15, limiting nail 16, pre-tightening spring 17, packing assembly 18. Detailed Description of the Embodiment

[0031] The following describes the implementation modes of the present utility model through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific implementation modes. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model.

[0032] It should be noted that the illustrations provided in this embodiment only schematically illustrate the basic concept of the present utility model. Therefore, only the components related to the present utility model are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and proportion of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex. The structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limited conditions under which the present utility model can be implemented. Therefore, they do not have technical substantial significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear description and are not used to limit the scope within which the present utility model can be implemented. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present utility model can be implemented.

[0033] As Figures 1 - 8 shown, the present utility model provides an eccentric ball valve.

[0034] In an exemplary embodiment, the eccentric ball valve includes:

[0035] A valve body 1, a valve core 3 is arranged inside the valve body 1, a valve cover 2 is arranged on the valve body 1, and a valve stem 6 for driving the valve core 3 to rotate is arranged inside the valve cover 2;

[0036] A valve seat structure, arranged on one side of the valve core 3 inside the valve body 1. The valve seat structure includes a support sleeve 7 and a seal 8. The support sleeve 7 is detachably connected inside the valve body 1, and the seal 8 is detachably connected to one end of the support sleeve 7 close to the valve core 3. The seal 8 can form a sealing pair with the sealing surface of the valve core 3;

[0037] A limiting component is arranged between the valve body 1 and the support sleeve 7, and the limiting component is used to fix the support sleeve 7.

[0038] In this embodiment, by providing the seal 8, a seal pair can be formed with the sealing surface of the valve core 3. At the same time, the seal 8 is installed on the support sleeve 7 in a detachable connection manner and cooperates with the valve core 3 to form a firm sealing structure. Under low-temperature working conditions, even if the parts shrink, sealing can still be achieved, and the seal 8 will not fall off or become loose, improving the sealing effect and ensuring that the valve can be normally closed.

[0039] At the same time, in this embodiment, through the provided limit assembly, the valve seat is fixed on the valve body 1 by the limit assembly. At the same time, due to the provided limit assembly, the valve seat has a slight moving distance, so that the problem that the valve core 3 quickly rubs against and damages the sealing surface, resulting in the valve being unable to be normally closed, can be avoided.

[0040] It is worth noting that in this embodiment, the support sleeve 7 is a metal support sleeve 7 to enhance the strength of the valve seat structure, and the seal 8 is a non-metallic sealing ring, which is installed at the end of the metal support sleeve 7. When the valve is closed, the seal pair formed between the sealing surface of the valve core 3 and the seal 8 blocks the medium and prevents it from flowing into the other side of the valve body 1, realizing the closing of the valve.

[0041] It should also be noted that in this embodiment, a positioning groove for embedding the support sleeve 7 is provided on the valve body 1 for the positioning and preliminary fixing of the support sleeve 7.

[0042] In this embodiment, the spherical surface of the valve core 3 in contact with the seal 8 is the first sealing surface 301, and the surface of the seal 8 in contact with the valve core 3 is the second sealing surface 802. The first sealing surface 301 and the second sealing surface 802 form a seal pair.

[0043] In another embodiment, the present invention also provides a valve, which includes a valve body, a valve cover, a valve core and the above-mentioned valve seat structure.

[0044] In an exemplary embodiment, there is a first eccentricity L1 between the axis of the valve stem 6 and the center of the ball of the valve core 3 in the first direction, and a second eccentricity L2 between the axis of the valve stem 6 and the center of the ball of the valve core 3 in the second direction. The first direction and the second direction are perpendicular.

[0045] As Figure 8 shown, in this embodiment, since the valve core 3 adopts a double-eccentric structure, there is a first eccentricity in the first direction and a second eccentricity in the second direction. Both the first direction and the second direction are the radial directions of the valve stem 6.

[0046] Exemplarily, the valve core 3 is provided with an "O"-shaped flow channel 301. The flow channel in this embodiment is of the "O" type, making the forces on the upper and lower shaft handles supported by the left and right sides of the "O"-shaped flow channel 301 symmetric, improving the overall mechanical strength of the valve core 3 and reducing shrinkage deformation. The flow channel of the valve core 3 of the eccentric ball valve in the prior art generally adopts a "C" type, while the "O"-shaped flow channel 301 in this embodiment can avoid the asymmetric forces on the upper and lower shaft handles supported by the left and right sides of the flow channel caused by the C-type structure of the conventional eccentric valve core 3 flow channel, and the shrinkage deformation amount on the left side is relatively large. Therefore, this structure can more effectively reduce the shrinkage deformation of the valve core 3 and ensure the opening, closing and sealing performance of the valve.

[0047] It is worth noting that the structure of the valve core 3 in this application adopts a spherical structure of about 1 / 3 of the whole ball. When disassembling, the valve core 3 only needs to be rotated 90° to disengage from the valve seat and then can be taken out, avoiding the need to use special inspection and maintenance tools for disassembly and replacement during the on-line disassembly and maintenance of the whole valve core 3, which has a complex process and takes a long time, and improving the disassembly efficiency.

[0048] It is also worth noting that the double-eccentric valve core 3 adopted in this embodiment can make the sealing between the valve core 3 and the valve seat structure use the double-eccentric cam rotation wedge tightening sealing principle to improve the sealing performance between the valve core 3 and the valve seat structure.

[0049] In an exemplary embodiment, an installation groove 11 is opened at one end of the support sleeve 7 close to the valve core 3. The installation groove 11 is provided with a fixing component, and the sealing member 8 is detachably connected to the installation groove 11 through the fixing component.

[0050] In this embodiment, the sealing member 8 is fixed by the provided installation groove 11 and the fixing component, so that the sealing member 8 is firmly installed at the front end of the support sleeve 7, which can effectively prevent the sealing member 8 from falling off the support sleeve 7.

[0051] Exemplarily, the connecting piece in this embodiment adopts a connecting screw, which can be threadedly connected to the third step 1104.

[0052] Exemplarily, the installation groove 11 includes a continuously arranged first step 1101, a second step 1102, and a third step 1104. One end of the seal 8 away from the valve core 3 abuts against the first step 1101. A sealing bead 801 is provided on the side wall of the seal 8. A sealing water line 1103 corresponding to the sealing bead 801 is provided on the second step 1102. The fixing assembly includes a retaining ring 9 and a connecting member. The retaining ring 9 is arranged on the third step 1104. The connecting member passes through the retaining ring 9 and is detachably connected to the valve body 1. The retaining ring 9 is provided with a pressing portion 10. The pressing portion 10 corresponds to the sealing bead 801 and can be used to press the sealing bead 801 into the sealing water line 1103. In this embodiment, after the connecting member passes through the retaining ring 9 and is connected to the support sleeve 7, the retaining ring 9 is fixed on the third step 1104. Synchronously, the pressing portion 10 of the retaining ring 9 contacts the sealing bead 801, presses the sealing bead 801 into the sealing water line 1103, and realizes the fixing of the seal 8.

[0053] Exemplarily, the inner edge side of one end of the seal 8 close to the valve core 3 is arc-shaped, specifically a "C"-shaped arc.

[0054] It should be noted that in this embodiment, a non-metallic sealing ring is embedded in the metal support sleeve 7, and the pressing and fixing structure is realized through the retaining ring 9 and the connecting member, which can prevent the non-metallic sealing ring from loosening, leaking, and coming off, and better ensure the sealing performance between the valve seat structure and the valve core 3. At the same time, the sealing bead 801 is provided with a pre-tightening force through the fastening of the retaining ring 9 and the connecting member, and the serrated sealing water line 1103 is embedded into the end face of the sealing bead 801, increasing the contact area of the sealing end face, and effectively improving the sealing performance between the non-metallic sealing ring and the end face of the metal support sleeve 7 under low-temperature conditions.

[0055] It should also be noted that the front end of the non-metallic sealing ring and the sealing surface of the valve core 3 are designed as a "C" arc, reducing the contact area of the sealing surface. Under low-temperature shrinkage deformation, the sealing position can be kept completely fitted, forming an elliptical line seal, and avoiding leakage caused by the incomplete fitting of the sealing surface due to low-temperature shrinkage deformation. This structure better ensures the sealing performance effect of the flow sealing between the valve seat structure and the valve core 3.

[0056] In an exemplary embodiment, a sealing ring 12 is provided between the support sleeve 7 and the valve body 1.

[0057] In this embodiment, by providing the sealing ring 12 between the support sleeve 7 and the valve body 1, it is possible to prevent the medium from leaking from the gap between the support sleeve 7 and the valve body 1.

[0058] Exemplarily, the sealing ring 12 in this embodiment adopts a radial sealing structure of a double-piston lip seal ring 12. The lip seal ring 12 is equipped with a pre-tightening spring 17, which can overcome the influence of temperature changes on the sealing performance of the sealing ring 12. At the same time, a double-piston double-direction sealing structure is adopted, which can achieve the double-direction sealing performance of the valve seat structure, avoiding the direct use of a gasket end-face sealing structure between the valve seat structure and the valve body 1, and preventing leakage caused by the reduction of the sealing specific pressure due to the shrinkage of parts without compensation. This structure better guarantees the sealing performance of the flow-through seal between the valve seat structure and the valve body 1.

[0059] It is worth noting that in order to improve the sealing strength between the support sleeve 7 and the valve body 1, the number of sealing rings 12 can be appropriately increased, or the position of the sealing ring 12 can be changed according to the specific installation structure.

[0060] In an exemplary embodiment, the valve body 1 is provided with a connection groove 13 on the outer side of the support sleeve 7. The limiting component includes a retaining ring 14 and a limiting pin 16. The retaining ring 14 is arranged in the connection groove 13 and is threadedly connected to the valve body 1. The retaining ring 14 has a limiting portion 1401. The support sleeve 7 is provided with a protruding portion 701. The limiting portion 1401 can be used to clamp the protruding portion 701 to fix the support sleeve 7 on the valve body 1. A limiting groove 15 is formed on the side wall of the retaining ring 14. The limiting pin 16 is threadedly connected to the valve body 1, and the free end of the limiting pin 16 penetrates radially into the valve body 1 and is located in the limiting groove 15 along the connection groove 13.

[0061] In this embodiment, by providing the connection groove 13 on the valve body 1, the retaining ring 14 can be installed in the connection groove 13, and the retaining ring 14 is threadedly connected to the connection groove 13, so that the retaining ring 14 can be firmly fixed on the valve body 1 to prevent the valve body 1 from falling off. After the retaining ring 14 is installed, the limiting portion 1401 of the retaining ring 14 clamps the protruding portion of the support sleeve 7 to realize the limiting and fixing of the support sleeve 7 and prevent the support sleeve 7 from falling off. Then, through the provided limiting groove 15 and the limiting pin 16, when the bottom of the limiting pin 16 enters the limiting groove 15, the limiting of the retaining ring 14 is realized, preventing the retaining ring 14 from rotating, thereby realizing the effective fixing of the retaining ring 14, improving the stability and firmness of the entire valve seat structure, and preventing the valve seat structure from coming out and affecting the opening and closing of the valve. Therefore, the adopted limiting component can better guarantee the position of the valve seat structure and the opening and closing performance of the valve.

[0062] Exemplarily, in this embodiment, a pre-tightening spring 17 is provided between the valve body 1 and the support sleeve 7, and the pre-tightening spring 17 is a disc spring. When the retaining ring 14 is installed, there is a certain gap between the limiting portion 1401 of the retaining ring 14 and the protruding portion 701 of the support sleeve 7. By utilizing the compression and resilience of the spring, it is ensured that the valve seat structure has a space and mobility for slight forward and backward movement. The pre-tightening spring 17 is a disc spring, and the disc spring can make the force on the valve seat structure uniform, which is more conducive to the sealing between the valve seat structure and the valve core 3. When the valve core 3 closes quickly, it can avoid the situation that the valve seat is fixed without buffering and mobility, and the rapid rubbing with the valve core 3 causes abrasion of the sealing surface. This structure better guarantees the sealing performance and service life of the flow-through seal between the valve seat structure and the valve core 3.

[0063] It should be noted that in this embodiment, other limiting pins 16 for preventing the retaining ring 14 from rotating can also be used. For example, a limiting hole is opened on the side wall of the retaining ring 14. After the retaining ring 14 is installed, the limiting pin 16 is inserted into the limiting hole to complete the limiting of the retaining ring 14, thereby effectively preventing the retaining ring 14 from rotating.

[0064] In an exemplary embodiment, a packing assembly 18 for sealing the valve body 1 is provided on the valve cover 2.

[0065] It should be noted that in this embodiment, a sealing ring is provided between the valve body 1 and the valve cover 2; metal bearings are provided on the upper and lower shafts of the valve core 3 to fix the position of the valve core 3. The upper bearing 5 is installed in the convex groove of the valve cover 2, and the lower bearing 4 is installed in the groove of the valve body 1. A relative movement surface is formed between the inner hole of the metal bearing and the shaft of the valve core 3. A valve stem 6 connected to the valve core 3 is placed in the main valve body 1. A guide ring is provided between the valve stem 6 and the main valve body 1. The valve core 3 transmits torque through the valve stem 6 and drives the valve core 3 to rotate 90° under the action of the driving force to cut off or open the medium flow. A pantograph seal ring, a guide ring and a graphite ring packing are provided between the valve stem 6 and the valve cover 2. The guide ring has a guiding and positioning effect on the valve stem 6. The pantograph seal ring and the graphite ring packing form a double-seal structure to avoid external leakage of the valve body 1. At the same time, the valve stem 6 is provided with a stepped anti-pressure-flying-out structure. The upper end of the valve stem 6 is connected to the actuator.

[0066] In summary, through the valve seat structure provided by the present utility model, the seal 8 can be fixed. Even under low-temperature conditions, the valve seat structure and the seal are not easily disengaged. The valve seat structure and the valve core 3 can achieve good sealing and can be normally closed after long-term use, ensuring the stability of the valve during operation.

[0067] The above embodiments are only illustrative of the principles and effects of the present utility model, and are not intended to limit the present utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. A valve seat structure is installed on the valve body of a valve. A valve core is provided inside the valve. It is characterized in that, The valve seat structure includes: A support sleeve, which is detachably connected to the valve body; A seal, which is detachably connected to one end of the support sleeve close to the valve core, and the seal can form a sealing pair with the sealing surface of the valve core; A limiting component is provided between the valve body and the support sleeve, and the limiting component is used to fix the support sleeve.

2. The valve seat structure according to claim 1, characterized in that: An installation groove is formed at one end of the support sleeve close to the valve core, and a fixing component is arranged in the installation groove. The seal is detachably connected to the installation groove through the fixing component.

3. The valve seat structure according to claim 2, wherein: The installation groove includes a continuously arranged first step, a second step and a third step. One end of the seal away from the valve core abuts against the first step. A sealing bead is provided on the side wall of the seal, and a sealing water line corresponding to the sealing bead is provided on the second step. The fixing component is arranged on the third step, and the fixing component can be used to press the seal against the second step.

4. The valve seat structure according to claim 3, characterized in that: It includes a retaining ring and a connecting piece. The retaining ring is arranged on the third step. The connecting piece passes through the retaining ring and is detachably connected to the valve body. The retaining ring is provided with a pressing part, and the pressing part corresponds to the sealing bead and can be used to press the sealing bead into the sealing water line.

5. The valve seat structure according to claim 1, characterized in that: A sealing ring is provided between the support sleeve and the valve body.

6. The valve seat structure according to claim 1, characterized in that: A connecting groove is formed on the outer side of the valve body where the support sleeve is located, and the limiting component is arranged in the connecting groove.

7. The valve seat structure according to claim 6, characterized in that: The limiting component includes a snap ring and a limiting piece. The snap ring is arranged in the connecting groove and is threadedly connected to the valve body. The limiting piece has a limiting part, and the support sleeve is provided with a protruding part. The limiting part can be used to clamp the protruding part to fix the support sleeve on the valve body.

8. The valve seat structure according to claim 7, wherein: A limiting groove is formed on the side wall of the snap ring. The limiting piece is threadedly connected to the valve body, and the free end of the limiting piece penetrates into the valve body and is located in the limiting groove.

9. The valve seat structure according to claim 1, characterized in that: A preloading spring is provided between the valve body and the support sleeve.

10. A valve, characterized in that: It includes a valve body, a valve cover and the valve seat structure according to any one of claims 1-9, and a valve core is arranged in the valve body.

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