Sealing structure of expansion valve seat and valve shaft

Abstract

The utility model provides a sealing structure of an expansion valve seat and a valve shaft, which is characterized in that a valve shaft is rotatably sleeved on a valve body, a valve plate is fixedly sleeved on the periphery of the valve shaft, the valve seat is sleeved on the inner ring of the valve body, an expansion space is arranged between the inner ring of the valve body and the valve seat, a feed port is arranged on the valve body, and external equipment can fill expansion media into the expansion space through the feed port. Sealing seats are arranged on the periphery of the valve shaft and in the through hole, and the periphery of the valve shaft is connected to an inner ring of the sealing seats in a sealed mode. According to the sealing structure of the expansion valve seat and the valve shaft, the sealing seat is a sealing connection structure between the valve shaft and the valve seat, between the valve seat and the valve plate and between the valve seat and the valve body, the periphery of the sealing seat is arranged in the valve body in a matched mode through extrusion so as to achieve the sealing performance of the part, and the lower end of the sealing seat is arranged on the outer edge of the valve plate in a matched mode through extrusion. An annular sealing ring is arranged on the inner ring of the sealing seat, so that the sealing performance between the sealing seat and the periphery of the valve shaft is achieved.

Description

Technical Field

[0001] The utility model belongs to the field of butterfly valves, and in particular relates to a sealing structure of an expansion valve seat and a valve shaft. Background Art

[0002] The butterfly valve, also known as the flap valve, is a regulating valve with a simple structure. It can be used for the on-off control of low-pressure pipeline media. The expansion-type sealing butterfly valve can reduce the friction between the valve plate and the valve seat, and can increase the service life of the valve seat. When it is closed, it is squeezed to the inner ring of the valve seat through the outer periphery of the valve plate, and the inner ring of the valve seat is reduced in diameter through the expansion medium to achieve a connection seal. It can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. In the expansion-type butterfly valve, the clearance between the valve seat and the valve plate is small in the natural state, and the pressure sealing structure between the valve seat and the valve body needs to withstand a certain medium. In the prior art, a sealing rubber ring is usually added between the valve shaft and the valve seat, and the sealing rubber ring is squeezed together by the valve seat, valve body and valve shaft to ensure the sealing of this part. In actual assembly, the sealing rubber ring is difficult to position and the assembly is difficult. Summary of the invention

[0003] In view of this, the utility model aims to propose a sealing structure for an expansion valve seat and a valve shaft, so as to solve the problem that in order to ensure the sealing performance between the valve seat and the valve seat and the valve body, a sealing rubber ring needs to be filled in the prior art, which makes assembly difficult and the production cost high.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A sealing structure for an expansion valve seat and a valve shaft comprises a valve body, a valve shaft, a valve seat and a valve plate. The valve body is rotatably sleeved with the valve shaft, and the periphery of the valve shaft is fixedly sleeved with the valve plate. The valve seat is sleeved on the inner ring of the valve body, an expansion space is provided between the inner ring of the valve body and the valve seat, and the valve body is provided with a feed port. An external device can fill the expansion space with an expansion medium through the feed port. The expansion medium is used to reduce the diameter of the inner ring of the valve seat. A through hole is provided on the valve seat, and the periphery of the valve shaft is located in the through hole. A sealing seat is provided on the periphery of the valve shaft and in the through hole, and the periphery of the valve shaft is sealed and connected to the inner ring of the sealing seat.

[0006] Furthermore, the sealing seat and the valve seat are an integral structure.

[0007] Furthermore, an annular sealing ring is arranged on the inner ring of the sealing seat, and the annular sealing ring and the sealing seat are an integral structure.

[0008] Furthermore, a positioning ring groove is provided in the inner ring of the valve body, a positioning boss is provided on the periphery of the valve seat, the positioning boss can be snapped into the positioning ring groove, two positioning bosses are provided on the periphery of the sealing seat, the two positioning bosses are respectively located on both sides of the sealing seat, and the positioning bosses are used to prevent leakage of the expansion medium.

[0009] Furthermore, the valve shaft includes a clamping positioning section and a bottom sleeve section and a shaft body are respectively arranged at both ends. The bottom sleeve section is rotatably sleeved to the side wall of the valve body. The clamping positioning section is located in the sleeve hole in the middle of the valve plate, and the clamping positioning section is clamped to the sleeve hole. The outer periphery of the shaft body is rotatably sleeved to the side wall of the valve body, and an external actuator is arranged at one end of the shaft body.

[0010] Furthermore, the outer contour of the snap-fit ​​positioning section is a polygonal structure, and the lower portion of the sleeve hole is a polygonal contour that matches the snap-fit ​​positioning section, and the upper portion of the sleeve hole is adapted to the outer contour of the shaft body.

[0011] Furthermore, the outer diameter of the bottom sleeve section is not greater than the outer dimension of the clamping and positioning section, and the outer dimension of the clamping and positioning section is not greater than the outer diameter of the shaft body.

[0012] Compared with the prior art, the sealing structure of the expansion valve seat and the valve shaft described in the utility model has the following beneficial effects: the sealing seat is a sealing connection structure between the valve shaft and the valve seat, the valve seat and the valve plate, and the valve seat and the valve body, the outer periphery of the sealing seat is adapted into the valve body by extrusion to achieve the sealing performance of this part, the lower end of the sealing seat is adapted to the outer edge of the valve plate by extrusion to achieve the sealing performance of this part, the inner ring of the sealing seat is provided with an annular sealing ring to achieve the sealing performance between the sealing seat and the outer periphery of the valve shaft, and in order to reduce the manufacturing cost and assembly cost, the sealing seat, the valve seat and the annular sealing ring are an integrated structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0014] Figure 1 This is a structural schematic diagram of a sealing structure of an expansion valve seat and a valve shaft according to an embodiment of the utility model installed on a butterfly valve;

[0015] Figure 2 It is a front view schematic diagram of a sealing structure of an expansion valve seat and a valve shaft according to an embodiment of the utility model installed on a butterfly valve;

[0016] Figure 3 This is a schematic diagram of the structure of the valve shaft according to an embodiment of the utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the valve seat according to an embodiment of the utility model;

[0018] Figure 5 It is a structural schematic diagram of the valve body described in an embodiment of the utility model.

[0019] Description of reference numerals:

[0020] 1-valve body; 11-feed port; 12-positioning ring groove; 13-clamping groove; 2-valve shaft; 21-clamping positioning section 22-bottom sleeve section; 23-shaft body; 3-valve seat; 31-positioning boss; 32-U-shaped ring groove; 33-clamping platform; 34-sealing seat; 35-annular sealing ring; 4-valve plate. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0022] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model 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 a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0023] 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 an indirect connection 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 by specific circumstances.

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0025] like Figure 1-Figure 5As shown, the sealing structure of the expansion valve seat and the valve shaft comprises a valve body 1, a valve shaft 2, a valve seat 3 and a valve plate 4. The valve body 1 is rotatably sleeved with the valve shaft 2, and the periphery of the valve shaft 2 is fixedly sleeved with the valve plate 4. The inner ring of the valve body 1 is sleeved with the valve seat 3, and an expansion space is provided between the inner ring of the valve body 1 and the valve seat 3, and the valve body 1 is provided with a feed port 11, and an external device can fill the expansion space with an expansion medium through the feed port 11, and the expansion medium is used to reduce the diameter of the inner ring of the valve seat 3, a through hole is provided on the valve seat 3, and the periphery of the valve shaft 2 is located in the through hole, and a sealing seat 34 is provided on the periphery of the valve shaft 2 and in the through hole, and the periphery of the valve shaft 2 is sealed and connected to the Connected to the inner ring of the sealing seat 34, the sealing seat 34 is a sealing connection structure between the valve shaft 2 and the valve seat 3, the valve seat 3 and the valve plate 4, and the valve seat 3 and the valve body 1. The outer periphery of the sealing seat 34 is adapted into the valve body 1 by extrusion to achieve the sealing performance of this part. The lower end of the sealing seat 34 is adapted to the outer edge of the valve plate 4 by extrusion to achieve the sealing performance of this part. The inner ring of the sealing seat 34 is provided with an annular sealing ring 35 to achieve the sealing performance between the sealing seat 34 and the outer periphery of the valve shaft 2. In order to reduce the manufacturing cost and assembly cost, the sealing seat 34, the valve seat 3 and the annular sealing ring 35 are an integrated structure.

[0026] A positioning ring groove 12 is provided on the inner ring of the valve body 1, and a positioning boss 31 is provided on the periphery of the valve seat 3. The positioning boss 31 can be snapped into the positioning ring groove 12 to improve the installation accuracy between the valve seat 3 and the valve body 1. A U-shaped ring groove is provided on the periphery of the valve seat 3, and the positioning boss 31 is located in the U-shaped ring groove 32. The positioning ring groove 12 on the valve body 1 is centrally arranged. The positioning boss 31 and the positioning ring groove 12 are used to locate the relative position between the valve seat 3 and the valve body 1. During implementation, the sealing seat 34 squeezes the valve plate 4, which will drive the valve seat 3 to deviate when the valve shaft 2 is rotated. The positioning boss 31 cooperates in the positioning ring groove 12, which can prevent the valve seat 3 from being displaced and improve the accuracy of use.

[0027] A clamping groove 13 is provided at both ends of the valve body 1, and a clamping platform 33 is provided on each inner side wall of the U-shaped ring groove 32. The outer periphery of the clamping platform 33 is clamped into the clamping groove 13. The clamping platform 33 and the clamping groove 13 cooperate to form a matching structure of the valve body 1 and the valve seat 3, which is convenient for the staff to install the valve seat 3 in place and improve the assembly quality.

[0028] In the natural state, there is a fitting gap between the periphery of the valve plate 4 and the valve seat 3, or the outer edge of the valve plate 4 tends to contact the inner ring of the valve seat 3, which reduces or avoids the wear of parts caused by the outer edge of the valve plate 4 scratching the inner ring of the valve seat 3 when the valve plate 4 moves, thereby increasing the service life of the device and improving the stability and reliability of the device.

[0029] When the device is applied to a new energy powder transmission pipeline, the outer periphery of the valve seat 3 can completely cover the inner circle of the valve body 1, so that the valve body 1 is completely isolated from the powder in the pipeline, and the material of the valve body 1 is prevented from contaminating the powder in the transmission pipeline. This structure can reduce the requirements for the material of the valve body 1, improve production efficiency, and reduce production costs.

[0030] Due to the setting of the positioning ring groove 12, the structural integrity of the inner ring of the valve body 1 is destroyed, and the compressed medium in the expansion space will leak out along the periphery of the valve shaft 2 from the positioning ring groove 12. Therefore, two positioning bosses 31 are set on the periphery of each sealing seat 34. The two positioning bosses 31 are respectively located on both sides of the sealing seat 34, and the positioning bosses 31 are used to prevent leakage of the expansion medium. During installation, the periphery of the sealing seat 34 is squeezed against the valve body 1 and the end of the sealing seat 34 is squeezed against the valve plate 4, so that the positioning boss 31 can be squeezed into the positioning ring groove 12, so that the positioning boss 31 fits tightly into the positioning ring groove 12, thereby ensuring the sealing performance of this part.

[0031] The valve shaft 2 includes a clamping positioning section 21 and a bottom sleeve section 22 and a shaft body 23 at both ends thereof. The bottom sleeve section 22 is rotatably sleeved to the side wall of the valve body 1. The clamping positioning section 21 is located in the sleeve hole in the middle of the valve plate 4, and the clamping positioning section 21 is clamped in the sleeve hole. The outer periphery of the shaft body 23 is rotatably sleeved to the side wall of the valve body 1, and an external actuator is arranged at one end of the shaft body 23. The outer contour of the clamping positioning section 21 is a polygonal structure, and the lower part of the sleeve hole is in contact with the clamping positioning section 21. The polygonal contour of the segment 21 matches, and the upper part of the sleeve hole is adapted to the outer contour of the shaft body 23, so that the periphery of the valve shaft 2 is clipped into the sleeve hole to realize the synchronous rotation of the valve plate 4 and the valve shaft 2. During implementation, the outer diameter of the bottom sleeve segment 22 is not larger than the outer dimension of the clip-on positioning segment 21, and the outer dimension of the clip-on positioning segment 21 is not larger than the outer diameter of the shaft body 23, so that during assembly, one end of the valve shaft 2 is inserted into the valve body 1 through an axial hole and then passes through the valve plate 4, completing the installation without causing interference.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. The sealing structure between the expansion valve seat and the valve shaft is characterized by: The invention comprises a valve body (1), a valve shaft (2), a valve seat (3) and a valve plate (4); the valve body (1) is rotatably sleeved with the valve shaft (2), and the periphery of the valve shaft (2) is fixedly sleeved with the valve plate (4); the inner ring of the valve body (1) is sleeved with the valve seat (3); an expansion space is provided between the inner ring of the valve body (1) and the valve seat (3); and the valve body (1) is provided with a feed port (11); an external device can fill an expansion medium into the expansion space through the feed port (11); the expansion medium is used to reduce the diameter of the inner ring of the valve seat (3); a through hole is provided on the valve seat (3), and the periphery of the valve shaft (2) is located in the through hole; a sealing seat (34) is provided on the periphery of the valve shaft (2) and in the through hole; and the periphery of the valve shaft (2) is sealed and connected to the inner ring of the sealing seat (34).

2. The sealing structure of the expansion valve seat and the valve shaft according to claim 1, characterized in that: The sealing seat (34) and the valve seat (3) are an integral structure.

3. The sealing structure of the expansion valve seat and the valve shaft according to claim 1, characterized in that: An annular sealing ring (35) is arranged on the inner ring of the sealing seat (34), and the annular sealing ring (35) and the sealing seat (34) are an integral structure.

4. The sealing structure of the expansion valve seat and the valve shaft according to claim 1, characterized in that: The inner ring of the valve body (1) is provided with a positioning ring groove (12), and the outer periphery of the valve seat (3) is provided with a positioning boss (31), and the positioning boss (31) can be snap-fitted into the positioning ring groove (12); Two positioning bosses (31) are arranged on the periphery of the sealing seat (34), the two positioning bosses (31) are respectively located on two sides of the sealing seat (34), and the positioning bosses (31) are used to prevent leakage of the expansion medium.

5. The sealing structure of the expansion valve seat and the valve shaft according to claim 1, characterized in that: The valve shaft (2) comprises a clamping positioning section (21) and a bottom sleeve section (22) and a shaft body (23) respectively arranged at both ends thereof, the bottom sleeve section (22) is rotatably sleeved onto the side wall of the valve body (1), the clamping positioning section (21) is located in a sleeve hole in the middle of the valve plate (4), and the clamping positioning section (21) is clamped into the sleeve hole, the outer periphery of the shaft body (23) is rotatably sleeved onto the side wall of the valve body (1), and an external actuator is arranged at one end of the shaft body (23).

6. The sealing structure of the expansion valve seat and the valve shaft according to claim 5, characterized in that: The outer contour of the clamping positioning section (21) is a polygonal structure, and the lower part of the sleeve hole is a polygonal contour that matches the clamping positioning section (21), and the upper part of the sleeve hole is adapted to the outer contour of the shaft body (23).

7. The sealing structure between the expansion valve seat and the valve shaft according to claim 5, characterized in that: The outer diameter of the bottom sleeve section (22) is not greater than the outer dimension of the clamping and positioning section (21), and the outer dimension of the clamping and positioning section (21) is not greater than the outer diameter of the shaft body (23).

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