Corrugated pipe ball valve

Abstract

The utility model belongs to the field of valves, and particularly relates to a corrugated pipe ball valve which comprises a valve body, a valve ball and a valve cover, a containing cavity is formed in the valve body, the valve ball and the valve cover are located in the containing cavity, a communication cavity is formed in the middle of the valve ball, the valve body is provided with an inlet, an outlet and an installation opening which are connected with the containing cavity, and the valve cover is arranged outside the installation opening. And the valve cover is connected with the mounting port in a sealing manner. Through the combination of the corrugated pipe and the scraping part, in the opening and closing process of the ball valve, the scraping part is used for cleaning the valve ball, the smoothness of the outer surface of the ball valve is kept, and it is ensured that the ball valve can be normally conducted under the working condition with dust, and stable sealing can be achieved when flow is cut off. The combination of the connecting cylinder, the corrugated pipe and the valve seat body is used, on the premise that normal conduction and closure are guaranteed, dust accumulation at the position of the corrugated pipe can be reduced, normal stretching and retracting of the corrugated pipe are guaranteed, under pre-tightening of the elastic part, the scraping part is always kept in close contact with the valve ball, and the surface of the valve ball is always smooth and clean in the long-time working process.

Description

Technical Field

[0001] The utility model belongs to the field of valves, and in particular relates to a bellows ball valve. Background Art

[0002] With the continuous development of nuclear power in my country, the requirements for valves for fluorine gas and powder state media are extremely stringent. However, the existing switch ball valve structure is difficult to meet this working condition. During the working process, due to the influence of impurities such as dust, the valve is very easy to fail during use. Utility Model Content

[0003] The utility model aims to provide a bellows ball valve for solving the urgent need in the market for a product which can adapt to the working condition process with low leakage of packing, zero leakage of sealing and can meet the helium detection performance.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A bellows ball valve, comprising: a valve body with an accommodating cavity inside, a valve cover and a valve ball located in the accommodating cavity, a connecting cavity is provided in the middle of the valve ball, the valve body has an inlet, an outlet and a mounting port connected to the accommodating cavity, the valve cover is arranged outside the mounting port, and the valve cover is sealed and connected to the mounting port;

[0006] The accommodating cavity also includes a valve seat body having a first through cavity in the middle, a bellows having a second through cavity in the middle, and a connecting cylinder having a third through cavity in the middle, wherein the connecting cylinder, the bellows, and the valve seat body are connected in sequence, the inlet, the first through cavity, the second through cavity, and the third through cavity are connected, and the third through cavity is connected with the outlet through the connecting cavity;

[0007] The connecting tube end is sleeved in the inlet, the outer wall of the connecting tube is sealed and connected to the inner wall of the inlet, a guide mechanism and an elastic part are arranged between the valve seat body end and the communicating cavity, the body of the guide mechanism is connected to the inner wall of the accommodating cavity, and the guide end of the guide mechanism is connected to the valve seat body;

[0008] The valve seat body is provided with a scraping portion matching the shape of the outer surface of the valve ball, and the working end of the scraping portion is in contact connection with the outer surface of the valve ball.

[0009] The guiding direction of the guiding mechanism faces the valve ball;

[0010] The guide mechanism comprises an outer wall of the valve seat body and an inner wall of the accommodating cavity which are connected in a sliding and sealing manner.

[0011] A first valve stem is fixedly connected to the valve ball, the radial direction of the connecting cavity is in the same direction as the axial direction of the first valve stem, the first valve stem passes through the mounting port and the valve cover in sequence, the first valve stem is rotatably sealed to the valve cover, and at least a portion of the first valve stem is located outside the valve cover.

[0012] The elastic part is a disc spring, one end of the disc spring is connected to the inner wall of the accommodating cavity, and the other end of the disc spring is connected to the scraping part through the valve seat body;

[0013] The elastic part is arranged in a closed space surrounded by the valve seat body, the bellows, the connecting tube and the accommodating cavity, and a sealing member for dynamic sealing is arranged between the valve seat body and the inner wall of the accommodating cavity.

[0014] The connecting tube and the inlet are welded.

[0015] A first wear-reducing sleeve is arranged between the first valve stem and the valve cover, and the first valve stem is rotatably connected to the valve cover through the first wear-reducing sleeve.

[0016] The other end of the first valve stem located at one end of the valve ball also includes a second valve stem, a second wear-reducing sleeve and a first blind hole located on the inner wall of the accommodating chamber, the second valve stem is fixedly connected to the valve ball, the second valve stem is coaxial with the first valve stem, at least a portion of the second valve stem and the second wear-reducing sleeve are located in the first blind hole, and the second valve stem is rotatably connected to the first blind hole through the second wear-reducing sleeve.

[0017] The valve ball, the first valve stem and the second valve stem are an integrated structure.

[0018] An annular packing, a packing pressure plate with an annular protrusion, a second connecting bolt and a prestressed disc spring are also provided between the first valve stem and the valve cover. The packing is located between the first valve stem and the valve cover. The packing and the annular protrusion are both sleeved on the first valve stem. The packing pressure plate is connected to the packing through the annular protrusion. The packing pressure plate is connected to the valve cover through the second connecting bolt and the prestressed disc spring.

[0019] The packing pressure plate includes an annular first packing pressure plate and an annular second packing pressure plate which are connected to each other. The first packing pressure plate and the second packing pressure plate are sleeved on the valve stem. The annular protrusion is located on the second packing pressure plate. The first packing pressure plate is suspended relative to the valve cover. The first packing pressure plate is connected to the valve cover through the second connecting bolt and the prestressed disc spring.

[0020] A second annular blind hole is provided outwardly around the installation opening on the valve body, and the bottom surface of the second blind hole is a convex arc shape;

[0021] The valve cover is provided with an annular convex ring matching the shape of the second blind hole, the convex ring is located in the second blind hole, a sealing gasket is provided between the convex ring and the second blind hole, and the shape of the sealing gasket matches the shape of the space between the convex ring and the second blind hole.

[0022] Compared with the prior art, the bellows ball valve provided by the utility model uses a combination of a bellows and a scraping part. During the process of opening and closing the ball valve, the scraping part is used to clean the valve ball, maintain the smoothness of the outer surface of the ball valve, and ensure that the ball valve can be stably sealed during normal conduction and interception under dusty working conditions. The utility model uses a combination of a connecting tube, a bellows, and a valve seat body. On the premise of ensuring normal conduction and interception, it can also reduce the accumulation of dust at the bellows and ensure the normal expansion and contraction of the bellows. Under the pre-tightening of the elastic part, the scraping part is always kept in close contact with the valve ball, so that the surface of the valve ball is always smooth during long-term operation. At the same time, it also prevents the problem of excessive friction between the scraping part and the valve ball due to heat shrinkage of the valve ball, which may damage the valve ball during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of the bellows ball valve of the utility model;

[0024] Figure 2 It is a structural schematic diagram of the valve ball;

[0025] Figure 3 It is a structural schematic diagram of the pre-pressing plate;

[0026] Figure 4 It is a schematic diagram of the sealing structure between the valve cover and the valve body;

[0027] Figure 5 It is a structural schematic diagram of the combination of the connecting tube, the bellows and the valve seat body;

[0028] Figure 6 for Figure 5 Schematic diagram of the enlarged structure at point A in the middle.

[0029] 10. The valve body is provided with a plurality of connecting rods, and the connecting rods are provided with a plurality of connecting rods. The connecting rods are provided with a plurality of connecting rods, and the connecting rods are provided with a plurality of connecting rods. The connecting rods are provided with a plurality of connecting rods, and the connecting rods are provided with a plurality of connecting rods. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] The present invention will be further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it.

[0032] Please refer to Figure 1 , which illustrates the overall structural diagram of the bellows ball valve of the utility model, the bellows ball valve comprises: a valve body 101 with an accommodating cavity 1011 inside, a valve ball 103 and a valve cover 102 located in the accommodating cavity 1011, a connecting cavity 1031 is provided in the middle of the valve ball 103, the valve body 101 is provided with an inlet 104, an outlet 105 and an installation port 106 connected to the accommodating cavity 1011, the valve cover 102 is arranged outside the installation port 106, and the valve cover 102 is sealed and connected to the installation port 106. An annular second blind hole 117 is provided on the outer circumference of the mounting opening 106 on the valve body 101, and the bottom surface of the second blind hole 117 is convex arc-shaped; an annular convex ring 119 matching the shape of the second blind hole 117 is provided on the valve cover 102, and the convex ring 119 is located in the second blind hole 117, and a sealing gasket 118 is provided between the convex ring 119 and the second blind hole 117, and the shape of the sealing gasket 118 matches the shape of the space between the convex ring 119 and the second blind hole 117. The sealing gasket 118 can be made of PCTFE, and the convex arc-shaped second blind hole 117 has a circular arc sealing surface and a double sealing structure of an inclined surface, which can effectively ensure the sealing performance of the valve cover 102.

[0033] The accommodating chamber 1011 also includes a valve seat body 107, a bellows 108 and a connecting tube 109. Figure 5As shown, the connecting cylinder 109, the bellows 108 and the valve seat body 107 are connected in sequence. The function of the bellows 108 is to allow the valve seat body 107 and the connecting cylinder 109 at both ends to change the relative distance, while ensuring the sealed circulation of the fluid. The valve seat body 107 has a first through cavity in the middle, the bellows 108 has a second through cavity in the middle, and the connecting cylinder 109 has a third through cavity in the middle. The first through cavity, the second through cavity and the third through cavity form an integral connecting cavity. The connection between the valve seat body 107, the bellows 108 and the connecting cylinder 109 can be a welding connection, an adhesive connection or a threaded sealing connection.

[0034] During installation, the valve seat body 107, the bellows 108 and the connecting tube 109 are an integrated structure. The valve seat body 107, the bellows 108 and the connecting tube 109 are a whole. In one embodiment, the diameter of one end of the connecting tube 109 is smaller than the diameter of one end of the valve seat body 107. After the valve seat body 107, the bellows 108 and the connecting tube 109 are placed in the accommodating cavity 1011, one end of the connecting tube 109 is extended from the accommodating cavity 1011 to the mouth of the inlet 104, and then the outer wall of the connecting tube 109 is sealed and connected to the inner wall of the inlet 104. The connecting tube 109 is sealed and connected to the mouth of the inlet 104 by welding or gluing. At one end of the valve seat body 107, a guide mechanism is set to guide the moving direction of the valve seat body 107, the purpose of which is to make the working end of the scraping part 111 set on the valve seat body 107 face the outer surface of the valve ball 103. An elastic part 110 is arranged between the valve seat body 107 and the accommodating chamber 1011. The elastic force of the elastic part 110 enables the working end of the scraping part 111 to be closely contacted with the outer surface of the valve ball 103, thereby ensuring that the scraping part 111 can effectively clean the dust on the valve ball 103. The elastic part 110 specifically adopts a disc spring, one end of which is connected to the inner wall of the accommodating chamber 1011, and the other end of which is connected to the scraping part 111 through the valve seat body 107. The design of the integrated structure of the valve seat body 107, the bellows 108 and the connecting tube 109 can effectively cut off the inlet medium from entering other cavities in the bellows ball valve except the guide cavity, thereby avoiding leakage. The retractable nature of the bellows enables the scraping part 111 to have a certain pre-tightening force. The scraping part 111 is in a dynamic form in the working state, thereby improving the sealing performance between the valve ball 103 and the valve body 101. The scraping part 111 scrapes the adsorbed matter on the ball surface of the valve ball 103, effectively preventing the accumulation and adhesion of granular media between the valve ball 103 and the valve seat body 107, and has a self-cleaning function to ensure the sealing effect and action stability of the valve. The elastic part 110 is installed on one side of the valve seat body 107 to achieve dynamic compensation, solve the problem of excessive friction torque caused by thermal expansion, solve the problem of increased sealing gap between the valve seat body 107 and the valve ball 103 due to wear, and weakening the sealing effect of the bellows ball valve.

[0035] The guiding direction of the guiding mechanism is directly facing the valve ball 103. In a specific embodiment, Figure 1 The guide mechanism includes the outer wall of the valve seat body 107 and the inner wall of the accommodating chamber 1011 connected in a sliding seal. The outer surface of the valve seat body 107 has a cylindrical outer surface, and the inner wall of the accommodating chamber 1011 also has a cylindrical inner surface matching the cylindrical outer surface, and the cylindrical outer surface and the cylindrical inner surface constitute a guide mechanism for guiding. A sealing component is also provided between the valve seat body 107 and the inner wall of the accommodating chamber 1011, which is used to make the valve seat body 107 and the inner wall of the accommodating chamber 1011 slide and seal. The elastic part 110 can be made of a disc spring made of wear-resistant and high-performance INCONEL 718. A seal for dynamic sealing is provided between the valve seat body 107 and the inner wall of the accommodating chamber 1011, which is used to make the enclosed space enclosed by the valve seat body 107, the bellows 108, the connecting tube 109 and the inner wall of the accommodating chamber 1011 relatively sealed with the medium in the valve ball 103. The elastic part 110 is arranged in a closed space surrounded by the valve seat body 107, the bellows 108, the connecting tube 109 and the inner wall of the accommodating chamber 1011, thereby avoiding the problem of the disc spring failing due to tiny powder in the medium, ensuring the long-term and effective operation of the disc spring, thereby ensuring the valve sealing and the stability of the valve operation.

[0036] The valve ball 103 in the present invention has a different structure from that in the prior art. Figure 2 As shown, the two ends of the valve ball 103 are respectively fixedly connected with the first valve stem 115 and the second valve stem 114. The use of the first valve stem 115 and the second valve stem 114 can ensure that the valve ball 103 has reliable centering and reduce the operating torque. It effectively solves the problem of centering between the ball and the valve stem, which causes large switching torque and easy connection failure. In order to further enhance the durability of the first valve stem 115 and the second valve stem 114, the first valve stem 115 and the second valve stem 114 can be surface hardened as a whole.

[0037] The second valve stem 114 is mainly used to position the valve ball 103 to ensure the stable rotation of the valve ball 103. The second valve stem 114 is located at the other end of the first valve stem 115 of the valve ball 103. A part of the second valve stem 114 and the second wear-reducing sleeve 113 are located in the first blind hole 116. The second valve stem 114 is rotatably connected to the first blind hole 116 through the second wear-reducing sleeve 113. The second wear-reducing sleeve 113 reduces the wear loss between the second valve stem 114 and the first blind hole 116.

[0038] The first valve stem 115 also has the function of positioning the valve ball 103. The first valve stem 115 passes through the installation port 106 and the valve cover 102 in sequence. The first valve stem 115 is rotatably sealed and connected to the valve cover 102. At least a portion of the first valve stem 115 is located outside the valve cover 102 and is used to connect with the actuator 126. The bracket 125 fixes the valve body 101, the valve cover 102 and the actuator 126 in a plane, further increasing the centering of the actuator 126 and the valve ball 103 when the bellows ball valve is working.

[0039] A first wear-reducing sleeve 112 is disposed between the first valve stem 115 and the valve cover 102, and the first valve stem 115 is rotatably connected to the valve cover 102 via the first wear-reducing sleeve 112. The first wear-reducing sleeve 112 reduces the wear loss between the first valve stem 115 and the valve cover 102.

[0040] An annular packing 122, a packing pressure plate with an annular protrusion, a second connecting bolt 124 and a prestressed disc spring 1211 are also provided between the first valve stem 115 and the valve cover 102. The packing 122 is located between the first valve stem 115 and the valve cover 102. The packing 122 and the annular protrusion are both sleeved on the first valve stem 115. The packing pressure plate is connected to the packing 122 through the annular protrusion. The packing pressure plate is connected to the valve cover 102 through the second connecting bolt 124 and the prestressed disc spring 1211. The packing pressure plate includes an annular first packing pressure plate 121 and an annular second packing pressure plate 123 which are connected to each other. The first packing pressure plate 121 and the second packing pressure plate 123 are provided on the valve stem 115. The annular protrusion is located on the second packing pressure plate 123. The first packing pressure plate 121 is suspended relative to the valve cover 102. The first packing pressure plate 121 is connected to the valve cover 102 through the second connecting bolt 124 and the prestressed disc spring 1211. The packing 122 is a sealing member used to prevent the medium in the accommodating chamber from leaking from the first valve stem portion.

[0041] The packing pressure plate, the prestressed disc spring 1211 and the second connecting bolt 124 continuously compress the packing 122 to prevent failure due to temperature and pressure changes. The pre-tightening force of the packing 122 is continuously compensated to prevent external leakage.

[0042] In summary, in the bellows ball valve provided by the utility model, by using a combination of a bellows and a scraping part, during the process of opening and closing the ball valve, the scraping part is used to clean the valve ball, maintain the smoothness of the outer surface of the ball valve, and ensure that the ball valve can be stably sealed during normal conduction and interception under dusty working conditions. The utility model uses a combination of a connecting tube, a bellows and a valve seat body, which can reduce the accumulation of dust at the bellows and ensure the normal expansion and contraction of the bellows while ensuring normal conduction and interception. Under the pre-tightening of the elastic part, the scraping part is always kept in close contact with the valve ball, so that the surface of the valve ball is always smooth during long-term operation, and at the same time, it also prevents the problem of excessive friction between the scraping part and the valve ball due to heat shrinkage of the valve ball, which may damage the valve ball during operation.

[0043] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The meaning of "several" is one or more, unless otherwise clearly and specifically defined.

[0045] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0046] In the description of the present utility model, 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0047] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A bellows ball valve, characterized in that: include: A valve body with an accommodating cavity inside, a valve cover and a valve ball located in the accommodating cavity, a connecting cavity is provided in the middle of the valve ball, the valve body has an inlet, an outlet and an installation port connected to the accommodating cavity, the valve cover is arranged outside the installation port, and the valve cover is sealed and connected to the installation port; The accommodating cavity also includes a valve seat body having a first through cavity in the middle, a bellows having a second through cavity in the middle, and a connecting cylinder having a third through cavity in the middle, wherein the connecting cylinder, the bellows, and the valve seat body are connected in sequence, the inlet, the first through cavity, the second through cavity, and the third through cavity are connected, and the third through cavity is connected with the outlet through the connecting cavity; The connecting tube end is sleeved in the inlet, the outer wall of the connecting tube is sealed and connected to the inner wall of the inlet, a guide mechanism and an elastic part are arranged between the valve seat body end and the communicating cavity, the body of the guide mechanism is connected to the inner wall of the accommodating cavity, and the guide end of the guide mechanism is connected to the valve seat body; The valve seat body is provided with a scraping portion matching the shape of the outer surface of the valve ball, and the working end of the scraping portion is in contact connection with the outer surface of the valve ball.

2. The bellows ball valve according to claim 1, characterized in that: The guiding direction of the guiding mechanism faces the valve ball; The guide mechanism comprises an outer wall of the valve seat body and an inner wall of the accommodating cavity which are connected in a sliding and sealing manner.

3. The bellows ball valve according to claim 1, characterized in that: A first valve stem is fixedly connected to the valve ball, the radial direction of the connecting cavity is in the same direction as the axial direction of the first valve stem, the first valve stem passes through the mounting port and the valve cover in sequence, the first valve stem is rotatably sealed to the valve cover, and at least a portion of the first valve stem is located outside the valve cover.

4. The bellows ball valve according to claim 1, characterized in that: The elastic part is a disc spring, one end of the disc spring is connected to the inner wall of the accommodating cavity, and the other end of the disc spring is connected to the scraping part through the valve seat body; The elastic part is arranged in a closed space surrounded by the valve seat body, the bellows, the connecting tube and the accommodating cavity, and a sealing member for dynamic sealing is arranged between the valve seat body and the inner wall of the accommodating cavity.

5. The bellows ball valve according to claim 1, characterized in that: The connecting tube and the inlet are welded.

6. The bellows ball valve according to claim 3, characterized in that: A first wear-reducing sleeve is arranged between the first valve stem and the valve cover, and the first valve stem is rotatably connected to the valve cover through the first wear-reducing sleeve.

7. The bellows ball valve according to claim 1, characterized in that: The other end of the first valve stem located at one end of the valve ball also includes a second valve stem, a second wear-reducing sleeve and a first blind hole located on the inner wall of the accommodating chamber, the second valve stem is fixedly connected to the valve ball, the second valve stem is coaxial with the first valve stem, at least a portion of the second valve stem and the second wear-reducing sleeve are located in the first blind hole, and the second valve stem is rotatably connected to the first blind hole through the second wear-reducing sleeve.

8. The bellows ball valve according to claim 7, characterized in that: The valve ball, the first valve stem and the second valve stem are an integrated structure.

9. The bellows ball valve according to claim 3, characterized in that: An annular packing, a packing pressure plate with an annular protrusion, a second connecting bolt and a prestressed disc spring are also provided between the first valve stem and the valve cover. The packing is located between the first valve stem and the valve cover. The packing and the annular protrusion are both sleeved on the first valve stem. The packing pressure plate is connected to the packing through the annular protrusion. The packing pressure plate is connected to the valve cover through the second connecting bolt and the prestressed disc spring. The packing pressure plate includes an annular first packing pressure plate and an annular second packing pressure plate which are connected to each other. The first packing pressure plate and the second packing pressure plate are sleeved on the valve stem. The annular protrusion is located on the second packing pressure plate. The first packing pressure plate is suspended relative to the valve cover. The first packing pressure plate is connected to the valve cover through the second connecting bolt and the prestressed disc spring.

10. The bellows ball valve according to claim 1, characterized in that: A second annular blind hole is provided outwardly around the installation opening on the valve body, and the bottom surface of the second blind hole is a convex arc shape; The valve cover is provided with an annular convex ring matching the shape of the second blind hole, the convex ring is located in the second blind hole, a sealing gasket is provided between the convex ring and the second blind hole, and the shape of the sealing gasket matches the shape of the space between the convex ring and the second blind hole.

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