A ball valve

Abstract

This application belongs to the field of valve technology, specifically disclosing a ball valve. The ball valve includes a valve body, a valve cover, a first valve seat, a valve core, a second valve seat, and a valve stem. The valve body and valve cover are interconnected to form a cylindrical structure with an axially penetrating internal flow channel. The side wall of the cylindrical structure has a mounting hole communicating with the internal flow channel. The valve body has a first sealing protrusion with a first sealing water line, and the valve cover has a second sealing protrusion with a second sealing water line. The first valve seat, valve core, and second valve seat are arranged sequentially along the axial direction and are collectively constrained within the cylindrical structure by the first and second sealing protrusions. The valve core has a slot and a through hole penetrating the valve core. The valve stem is rotatably and sealingly connected to the mounting hole. The lower end of the valve stem is inserted into the slot and has a clearance fit with the inner bottom wall of the slot. The valve stem can drive the valve core to rotate synchronously, aligning the through hole with the internal flow channel to allow the medium to flow, or misaligning it with the internal flow channel to block the medium. The ball valve of this application is less prone to leakage and less prone to valve core jamming.

Description

Technical Field

[0001] This application belongs to the field of valve technology, and more specifically, relates to a ball valve. Background Technology

[0002] A ball valve is a common and widely used type of valve. It generally consists of a valve body, a valve core, and a valve stem. When in use, the valve stem is rotated to drive the valve core to rotate, thereby changing the connection state of the valve cavity inside the valve body and achieving the purpose of controlling the opening and closing of the pipeline.

[0003] Currently, ball valves may experience numerous malfunctions during use. For example, the valve core may scratch the valve seat when rotating, causing water leakage at the valve seat and subsequently leading to internal leakage in the ball valve. Another example is the poor sealing effect between the valve body, valve cover, and valve core, which causes leakage at the sealing connection, making it difficult for the ball valve to be used for a long time. Therefore, improvements are urgently needed. Utility Model Content

[0004] In view of the deficiencies or improvement needs of the prior art, this application provides a ball valve, which aims to reduce the failure risk of the ball valve during use and extend the service life of the valve ball.

[0005] This application provides a ball valve, specifically comprising a valve body, a valve cover, a first valve seat, a valve core, a second valve seat, and a valve stem, wherein: The valve body and valve cover are connected to each other to form a cylindrical structure with an axially penetrating internal flow channel. The side wall of the cylindrical structure is provided with a mounting hole that communicates with the internal flow channel. The valve body is provided with a first sealing protrusion with a first sealing water line, and the valve cover is provided with a second sealing protrusion with a second sealing water line. The first valve seat, the valve core and the second valve seat are arranged sequentially along the axial direction and are jointly constrained in the cylindrical structure by the first sealing protrusion and the second sealing protrusion. The valve core is provided with a slot and a through hole penetrating the valve core. The valve stem is rotatably and sealingly connected in the mounting hole. The lower end of the valve stem is inserted into the slot and has a clearance fit with the inner bottom wall of the slot. The valve stem can drive the valve core to rotate synchronously, so that the through hole is aligned with the inner flow channel to conduct the medium, or misaligned with the inner flow channel to block the medium.

[0006] As a further preferred embodiment, the lower end of the valve stem protrudes to form a limiting protrusion, and the upper end of the valve stem is threaded with a nut. The limiting protrusion and the nut are separate and abut against the openings at both ends of the mounting hole, so that the valve stem can be circumferentially rotatably connected to the mounting hole.

[0007] As a further preferred embodiment, a gap is left between the limiting protrusion and the outer surface of the valve core.

[0008] As a further preferred embodiment, the upper end of the valve stem is fitted with a handle, which is secured at the opening of the mounting hole by the nut.

[0009] As a further preferred embodiment, a sealing ring is provided between the valve stem and the inner wall of the mounting hole.

[0010] As a further preferred embodiment, both the lower end face of the valve stem and the inner bottom surface of the slot are arc surfaces.

[0011] As a further preferred embodiment, both the surface of the first valve seat facing the valve core and the surface of the second valve seat facing the valve core are arc-shaped sealing surfaces.

[0012] As a further preferred embodiment, the hardness of both the first valve seat and the second valve seat is less than that of the valve core, valve body, and valve cover.

[0013] As a further preferred embodiment, the valve seat orifice diameter of both the first valve seat and the second valve seat is not smaller than the through hole diameter of the valve core.

[0014] As a further preferred embodiment, a weight-reducing groove is provided at the center of the lower end of the valve core.

[0015] In summary, compared with the prior art, the technical solutions conceived in this application have the following main technical advantages: In the ball valve designed in this application, by setting the diameter of the valve seat hole to be no less than the diameter of the valve core hole, it is possible to effectively prevent the valve core from scratching the valve seat during rotation, making it less prone to water leakage at the valve seat. Furthermore, by providing sealing water lines inside the valve body and valve cover, the sealing effect between the valve body and the first valve seat, and between the valve cover and the second valve seat, can be improved, while also compensating for the compression of the first and second valve seats. In addition, by controlling the installation position of the valve stem, a radial clearance exists between the valve stem and the valve core, preventing the valve stem from jamming with the valve core, resulting in smoother operation of the ball valve and a significantly extended service life. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the ball valve provided in the embodiments of this application; Figure 2 This is a cross-sectional view of the ball valve provided in the embodiment of this application; Figure 3 This is an exploded view of the ball valve provided in the embodiments of this application; Figure 4 This is a cross-sectional view of the valve body provided in an embodiment of this application; Figure 5 yes Figure 4 Enlarged view of point C in the middle; Figure 6 This is a schematic diagram of the first valve seat and valve core provided in the embodiments of this application; Figure 7This is a schematic diagram of the valve stem structure provided in an embodiment of this application; Figure 8 This is a schematic diagram of the structure of the first valve seat and the annular protrusion provided in the embodiment of this application.

[0017] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein: 1. Valve body; 1-1. Mounting hole; 1-2. First sealing protrusion; 1-2a. First sealing water line; 2. Valve cover; 2-1. Second sealing protrusion; 3. First valve seat; 4. Valve core; 4-1. Slot; 4-2. Through hole; 4-3. Weight reduction groove; 5. Second valve seat; 6. Valve stem; 6-1. Limiting protrusion; 6-2. Lower flat structure; 6-3. Upper flat structure; 7. Nut; 8. Handle; 9. Sealing ring; 10. Inner flow channel; 11. Annular protrusion. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0019] The following is in conjunction with the appendix Figures 1-8 This application will be described in further detail.

[0020] This application discloses a ball valve. (Refer to...) Figures 1-5 The ball valve includes a valve body 1, a valve cover 2, a first valve seat 3, a valve core 4, a second valve seat 5, and a valve stem 6. The valve body 1 and the valve cover 2 are connected to each other to form a cylindrical structure with an axially penetrating inner flow channel 10. The side wall of the cylindrical structure is provided with a mounting hole 1-1 communicating with the inner flow channel 10. The valve body 1 is provided with a first sealing protrusion 1-2 with a first sealing water line 1-2a, and the valve cover 2 is provided with a second sealing protrusion 2-1 with a second sealing water line. The first valve seat 3, the valve core 4, and the second valve seat 5 are arranged axially in sequence. The valve core 4 is arranged and is constrained within the cylindrical structure by the first sealing protrusion 1-2 and the second sealing protrusion 2-1. The valve core 4 is provided with a slot 4-1 and a through hole 4-2 passing through the valve core 4. The valve stem 6 is rotatably and sealingly connected in the mounting hole 1-1. The lower end of the valve stem 6 is inserted into the slot 4-1 and is clearance-fitted with the inner bottom wall of the slot 4-1. The valve stem 6 can drive the valve core 4 to rotate synchronously, so that the through hole 4-2 is aligned with the inner flow channel 10 to conduct the medium, or misaligned with the inner flow channel 10 to block the medium, thereby realizing the opening and closing regulation of the ball valve.

[0021] In this design, one end face of the first sealing protrusion 1-2 with the first sealing water line 1-2a is sealed and fitted to the first valve seat 3, and one end face of the second sealing protrusion 2-1 with the first sealing water line is sealed and fitted to the second valve seat 5. By setting the sealing water line, the sealing effect between the valve body 1 and the first valve seat 3, and between the valve cover 2 and the second valve seat 5, can be improved. It also compensates for the compression of the first valve seat 3 and the second valve seat 5, thereby significantly improving the sealing effect of the ball valve. Preferably, the outer surfaces of the first sealing water line 1-2a and the second sealing water line are arc-shaped.

[0022] Furthermore, in this embodiment, the valve body 1 and the valve cover 2 are connected by threads. After the valve body 1 and the valve cover 2 form a cylindrical structure, the first valve seat 3, the valve core 4, and the second valve seat 5 are clamped between the valve body 1 and the valve cover 2 through the first sealing protrusion 1-2 and the second sealing protrusion 2-1 on both sides. The outer wall surfaces of the first valve seat 3, the valve core 4, and the second valve seat 5 are all sealed and fitted to the inner wall surface of the cylindrical structure. Preferably, the surface of the first valve seat 3 facing the valve core 4 and the surface of the second valve seat 5 facing the valve core 4 are both arc-shaped sealing surfaces. This design can significantly improve sealing reliability, reduce operating resistance, and make switching smoother.

[0023] Furthermore, in some embodiments, the valve seat orifice diameters of both the first valve seat 3 and the second valve seat 5 are not smaller than the diameter of the through hole 4-2 in the valve core 4. This design effectively prevents the valve seat from being scratched when the valve core 4 rotates, thus avoiding water leakage at the valve seat. For ease of understanding, Figure 6 The diameter of the valve seat orifice in the first valve seat 3 is indicated by dimension D1, and the diameter of the through hole 4-2 in the valve core 4 is indicated by dimension D2.

[0024] In a further preferred embodiment, the valve seat orifice diameters of both the first valve seat 3 and the second valve seat 5 are smaller than the orifice diameter of the through hole 4-2 in the valve core 4, and the valve seat orifice diameters of the first valve seat 3 and the second valve seat 5 are equal. Further preferred, the two ends of the through hole 4-2 in the valve core 4 are rounded and chamfered. This rounded chamfer effectively prevents the formation of burrs and avoids sharp corners that could scratch the first valve seat 3 and the second valve seat 5.

[0025] Furthermore, in some embodiments, the hardness of the first valve seat 3 and the second valve seat 5 is lower than that of the valve core 4, the valve body 1, and the valve cover 2. Under this design, the valve seat with lower hardness will undergo slight elastic deformation under the action of medium pressure or valve operating force. This deformation can fill the tiny gap between the valve core 4 and the cylindrical structure, thereby achieving a sealing effect that is superior to hard seals, and is especially suitable for scenarios with strict requirements on leakage rate.

[0026] Furthermore, such as Figure 6 As shown, in some embodiments, a weight-reducing groove 4-3 is provided at the lower center of the valve core 4. By providing the weight-reducing groove 4-3, the overall weight of the ball valve can be reduced.

[0027] Furthermore, such as Figure 2 As shown, in some embodiments, the lower end of the valve stem 6 (i.e. the end of the valve stem 6 near the valve core 4) protrudes to form a limiting protrusion 6-1, and the upper end of the valve stem 6 (i.e. the end of the valve stem 6 away from the valve core 4) is threaded with a nut 7. The limiting protrusion 6-1 and the nut 7 are separate and abut against the openings at both ends of the mounting hole 1-1, so that the valve stem 6 can be rotatably connected in the mounting hole 1-1.

[0028] Preferably, a gap is left between the limiting protrusion 6-1 and the outer surface of the valve core 4. For ease of understanding, Figure 2 The dimension A indicates the gap between the lower end of the valve stem 6 and the inner bottom wall of the slot 4-1. Figure 2 The clearance between the limiting protrusion 6-1 and the outer surface of the valve core 4 is indicated by dimension B. In this design, by controlling the installation position of the valve stem 6, a clearance fit is formed between the lower end of the valve stem 6 and the valve core 4, which prevents the valve stem 6 from jamming with the valve core 4. This makes the ball valve less prone to sealing or switching failures, reducing the risk of malfunction during use.

[0029] Specifically, such as Figure 2 As shown, in some embodiments, the mounting hole 1-1 is provided on the valve body 1. The inner opening of the mounting hole 1-1 is in the shape of a stepped opening, and the limiting protrusion 6-1 abuts against the stepped platform of the inner opening to form an axial limit on the end of the valve stem 6 near the valve core 4. During the installation process, the valve stem 6 is first installed from the inside to the outside along the mounting hole 1-1, and the limiting protrusion 6-1 limits the valve stem 6. Then, a handle 8 is fitted onto the end of the valve stem 6 that extends out of the mounting hole 1-1, and a nut 7 is fitted onto the end of the valve stem 6. The nut 7 restricts the handle 8 at the opening of the mounting hole 1-1 to achieve stable installation of the valve stem 6.

[0030] Furthermore, such as Figure 2 , Figure 7 As shown, in some embodiments, one end of the valve stem 6 inserted into the slot 4-1 is a lower flat structure 6-2. The lower end face of the lower flat structure 6-2 in the valve stem 6 and the inner bottom surface of the slot 4-1 are both arc surfaces to form a circular arc structure. With this design, the bottom of the valve stem 6 and the top of the valve core 4 cooperate with each other through the circular arc structure, making them easier to machine.

[0031] Furthermore, such as Figure 2 As shown, in some embodiments, a sealing ring 9 is sandwiched between the valve stem 6 and the inner wall of the mounting hole 1-1. Preferably, the middle part of the valve stem 6 is cylindrical, and its outer circumference is provided with a plurality of annular grooves for assembling the sealing ring 9. By assembling the sealing ring 9, the sealing performance between the valve stem 6 and the inner wall of the mounting hole 1-1 is improved.

[0032] Furthermore, such as Figure 2 , Figure 7 As shown, in some embodiments, the end of the valve stem 6 used for assembling the nut 7 and the handle 8 is an upper flat structure 6-3, the thickness direction of which is perpendicular to the thickness direction of the lower flat structure 6-2. Correspondingly, the connecting part of the handle 8 is provided with an elongated hole adapted to the upper flat structure 6-3. The handle 8 is fitted onto the upper flat structure 6-3 through the elongated hole, while the nut 7 is threadedly connected to the upper flat structure 6-3, thus confining the handle 8 between the nut 7 and the valve body 1. In actual use, rotating the handle 8 can drive the valve stem 6 to rotate.

[0033] Furthermore, in some other embodiments, both the first valve seat 3 and the second valve seat 5 are connected to a flexible sealing seat 11 at one end near the valve core 4. The flexible sealing seat 11 has a sealing surface for sealing and fitting with the valve core 4. By providing the flexible sealing seat 11, the sealing performance of the outer peripheral surface of the valve core 4 can be further improved.

[0034] Furthermore, such as Figure 8 As shown, in some other embodiments, the end of the flexible sealing seat 11 away from the first valve seat 3 is contracted inward so that the flexible sealing seat 11 can have a better sealing fit with the valve core 4. The flexible sealing seat 11 at the second sealing seat 5 is similarly configured.

[0035] It should be understood that expressions such as "comprising" and "may include" as used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In this application, terms such as "comprising" and / or "having" may be interpreted as indicating a specific characteristic, number, operation, constituent element, component, or combination thereof, but should not be interpreted as excluding the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.

[0036] It should be understood that the terms “center,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0038] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0039] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A ball valve, characterized in that It includes a valve body (1), a valve cover (2), a first valve seat (3), a valve core (4), a second valve seat (5), and a valve stem (6), wherein: The valve body (1) and the valve cover (2) are connected to each other to form a cylindrical structure with an axially penetrating inner flow channel (10). The side wall of the cylindrical structure is provided with a mounting hole (1-1) that communicates with the inner flow channel (10). The valve body (1) is provided with a first sealing protrusion (1-2) with a first sealing water line (1-2a), and the valve cover (2) is provided with a second sealing protrusion (2-1) with a second sealing water line; the first valve seat (3), the valve core (4), and the second valve seat (5) are arranged sequentially along the axial direction and are constrained by the first sealing protrusion (1-2) and the second sealing protrusion (2-1) within the cylindrical structure; the valve core (4) is provided with a slot (4-1) and a through hole (4-2); The valve stem (6) is rotatably and sealingly connected in the mounting hole (1-1). The lower end of the valve stem (6) is inserted into the slot (4-1) and is clearance-fitted with the inner bottom wall of the slot (4-1). The valve stem (6) can drive the valve core (4) to rotate synchronously, so that the through hole (4-2) is aligned with the inner flow channel (10) to conduct the medium, or misaligned with the inner flow channel (10) to block the medium.

2. The ball valve as described in claim 1, characterized in that, The lower end of the valve stem (6) has a protruding limiting protrusion (6-1) on its outer periphery. The upper end of the valve stem (6) is threaded with a nut (7). The limiting protrusion (6-1) and the nut (7) are separate and abut against the openings at both ends of the mounting hole (1-1), so that the valve stem (6) can be rotatably connected to the mounting hole (1-1).

3. The ball valve as described in claim 2, characterized in that, A gap is left between the limiting protrusion (6-1) and the outer surface of the valve core (4).

4. The ball valve as described in claim 2, characterized in that, The upper end of the valve stem (6) is fitted with a handle (8), and the handle (8) is restricted by the nut (7) at the opening of the mounting hole (1-1).

5. The ball valve as described in claim 1, characterized in that, A sealing ring (9) is sandwiched between the valve stem (6) and the inner wall of the mounting hole (1-1).

6. The ball valve as described in claim 1, characterized in that, The lower end face of the valve stem (6) and the inner bottom face of the slot (4-1) are both arc surfaces.

7. The ball valve as claimed in claim 1, characterized in that, The surface of the first valve seat (3) facing the valve core (4) and the surface of the second valve seat (5) facing the valve core (4) are both arc-shaped sealing surfaces.

8. The ball valve as claimed in claim 1, characterized in that, The hardness of the first valve seat (3) and the second valve seat (5) is less than that of the valve core (4), the valve body (1) and the valve cover (2).

9. The ball valve according to any one of claims 1-8, characterized in that, The valve seat orifice diameter of the first valve seat (3) and the second valve seat (5) is not less than the orifice diameter of the through hole (4-2) of the valve core (4).

10. The ball valve according to any one of claims 1-8, characterized in that, A weight-reducing groove (4-3) is provided at the lower center of the valve core (4).

Images