Ball valve

Abstract

The utility model relates to the technical field of valves, in particular to a ball valve which comprises a valve body, a ball core, a valve rod and a driving mechanism, a flow channel is arranged in the valve body, the ball core is arranged in the flow channel, the driving mechanism drives the ball core to rotate through the valve rod, a valve seat which is matched with the ball core in a sealing mode to separate the flow channel is further arranged in the valve body, and the valve rod is arranged in the valve seat. The valve seat comprises a valve seat body and a special-shaped sealing ring, a sealing ring groove is formed in the valve seat body in the direction towards the ball core, the special-shaped sealing ring is arranged in the sealing ring groove, an arc sealing end protruding out of the sealing ring groove is arranged at the end of the special-shaped sealing ring, and the arc sealing end is used for being matched with the ball core in a sealing mode. The valve seat body is further provided with a drainage hole, one end of the drainage hole is communicated with the sealing ring groove, the other end of the drainage hole is communicated with the flow channel, the movable special-shaped sealing ring is arranged on the valve seat and matched with the ball core in a sealing mode, self-compensation is conducted on sealing performance, and the risk of leakage of the ball valve is reduced.

Description

Technical Field

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

[0002] Ball valve, the opening and closing part is a valve in which the ball is driven by the valve stem and rotates around the axis of the ball valve. It can also be used for fluid regulation and control. This type of valve should generally be installed horizontally in the pipeline. Its main features are compact structure, high reliability, and easy operation and maintenance.

[0003] Existing ball valves usually adopt a hard-sealed valve seat sealing structure. Under the repeated rotation and opening and closing of the ball core, the hard-sealed valve seat will be frequently rubbed, causing wear and tear, which greatly reduces the sealing performance and puts the ball valve at risk of leakage. Therefore, it is necessary to propose a ball valve with a self-compensating valve seat sealing structure. Utility Model Content

[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide a ball valve. A movable special-shaped sealing ring is provided on the valve seat of the present invention to cooperate with the ball core seal to perform self-compensation for the sealing and reduce the risk of leakage of the ball valve.

[0005] The technical solution adopted by the present invention is as follows: a ball valve, including a valve body, a ball core, a valve stem and a driving mechanism, a flow channel is provided in the valve body, the ball core is arranged in the flow channel, the driving mechanism drives the ball core to rotate through the valve stem, and a valve seat is also provided in the valve body for sealing with the ball core to separate the flow channel, the valve seat includes a valve seat body and a special-shaped sealing ring, the valve seat body is provided with a sealing ring groove toward the ball core, the special-shaped sealing ring is arranged in the sealing ring groove, and the end of the special-shaped sealing ring is provided with an arc sealing end protruding to the outside of the sealing ring groove, the arc sealing end is used to seal with the ball core, and a drainage hole is also provided on the valve seat body, one end of the drainage hole is connected with the sealing ring groove and the other end is connected with the flow channel.

[0006] The end of the special-shaped sealing ring away from the arc sealing end is provided with a blocking end, the outer wall of the blocking end is in contact with the inner wall of the sealing ring groove, and when the end face of the blocking end is in contact with the bottom wall of the sealing ring groove, a corner of the blocking end extends into the drainage hole.

[0007] The drainage hole is provided with a drainage arc surface on one end edge close to the flow channel.

[0008] The middle portion of the special-shaped sealing ring is further provided with an indented section, and a gap is formed between the indented section and the sealing ring groove.

[0009] The valve seat body is slidably arranged in the valve body, and a sealing ring and a limit assembly are provided between the valve seat body and the valve body. The limit assembly includes a limit end cover and an elastic member. The limit end cover is arranged on the side of the valve seat body away from the ball core, and the limit end cover is threadedly connected to the inner wall of the valve body. One end of the elastic member abuts the valve seat body and the other end abuts the limit end cover.

[0010] A sealing filler and a driving slider are further provided between the valve seat body and the elastic member. The sealing filler is extruded and arranged between the driving slider and the valve seat body. One end of the elastic member abuts against the driving slider and the other end abuts against the limiting end cover.

[0011] The valve seat body is further extended with an extension section that fits with the inner wall of the limiting end cover. The elastic member is two disc springs that abut against each other. The inner walls of the two disc springs fit with the outer wall of the extension section.

[0012] A disassembly hole is provided on the end surface of the position-limiting end cover away from the valve seat body.

[0013] The beneficial effects of the present invention are as follows: a movable special-shaped sealing ring is provided on the valve seat of the present invention to cooperate with the ball core seal, and the drainage hole connected to the sealing ring groove is used for the fluid in the flow channel to flow in. The fluid will push the special-shaped sealing ring to move toward the ball core, and self-compensate for the sealing performance. The faster the fluid flow rate, the greater the force pushing the special-shaped sealing ring, and thus the better the sealing performance, which greatly reduces the risk of ball valve leakage. Even when there is no fluid flowing in the flow channel, the protruding arc sealing end of the special-shaped sealing ring can cooperate with the ball core seal, resulting in good sealing performance and longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still fall within the scope of the present invention.

[0015] Figure 1 This is a structural diagram of a ball valve of the utility model;

[0016] Figure 2 for Figure 1 A partial enlarged schematic diagram of point A in the middle;

[0017] In the figure, 1-valve body, 2-ball core, 3-valve stem, 4-driving mechanism, 5-flow channel, 6-valve seat body, 7-special-shaped sealing ring, 8-sealing ring groove, 9-arc sealing end, 10-drainage hole, 11-blocking end, 12-drainage arc surface, 13-concave section, 14-gap, 15-sealing ring, 16-limiting end cover, 17-elastic part, 18-sealing packing, 19-driving slider, 20-extension section, 21-disassembly hole. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0019] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two non-identical entities or non-identical parameters with the same name. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. Subsequent embodiments will not explain this one by one.

[0020] The directional and positional terms used in this invention, such as "upper," "lower," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are used solely to refer to the directions or positions in the accompanying drawings. Therefore, the directional and positional terms used are intended to illustrate and facilitate understanding of this invention and are not intended to limit the scope of protection of this invention.

[0021] like Figures 1 to 2 The figure shows an embodiment of the present invention, a ball valve, comprising a valve body 1, a ball core 2, a valve stem 3 and a driving mechanism 4, wherein a flow channel 5 is provided in the valve body 1, the ball core 2 is arranged in the flow channel 5, and the driving mechanism 4 drives the ball core 2 to rotate through the valve stem 3, and a valve seat is further provided in the valve body 1 for sealing with the ball core 2 to separate the flow channel 5, the valve seat comprises a valve seat body 6 and a special-shaped sealing ring 7, the valve seat body 6 is provided with a sealing ring groove 8 toward the ball core 2, the special-shaped sealing ring 7 is arranged in the sealing ring groove 8, and the end of the special-shaped sealing ring 7 is provided with an arc sealing end 9 protruding to the outside of the sealing ring groove 8, the arc sealing end 9 is used to seal with the ball core 2, and a drainage hole 10 is further provided on the valve seat body 6, one end of the drainage hole 10 is connected with the sealing ring groove 8 and the other end is connected with the flow channel 5.

[0022] The beneficial effects of such a setting are as follows: a movable special-shaped sealing ring is provided on the valve seat of the utility model to cooperate with the ball core seal, and the drainage hole connected to the sealing ring groove is used for the fluid in the flow channel to flow in. The fluid will push the special-shaped sealing ring to move toward the ball core, and self-compensate for the sealing. The faster the fluid flow rate, the greater the force pushing the special-shaped sealing ring, and thus the better the sealing, which greatly reduces the risk of ball valve leakage. Even when there is no fluid flowing in the flow channel, the protruding arc sealing end of the special-shaped sealing ring can cooperate with the ball core seal, resulting in good sealing and longer service life.

[0023] It is further provided that the end of the special-shaped sealing ring 7 away from the arc sealing end 9 is provided with a blocking end 11, the outer wall of the blocking end 11 is in contact with the inner wall of the sealing ring groove 8, and when the end face of the blocking end 11 is in contact with the bottom wall of the sealing ring groove 8, a corner of the blocking end 11 extends into the drainage hole 10.

[0024] The beneficial effects of this setting are as follows: the blocking end is adapted to the sealing ring groove to prevent the fluid from flowing into the sealing ring groove from the drainage hole. The fluid flowing through the drainage hole can only be used to push the special-shaped sealing ring to move. One corner of the blocking end provides a better force angle and area, and the fluid can push the blocking end along the axial direction of the special-shaped sealing ring.

[0025] It is further provided that a drainage arc surface 12 is provided on an edge of one end of the drainage hole 10 close to the flow channel 5 .

[0026] The beneficial effects of such a setting are as follows: the drainage arc surface can guide the fluid to flow into the drainage hole, and the fluid can flow into the drainage hole at a faster flow rate and a larger flow rate, thereby pushing the special-shaped sealing ring more forcefully.

[0027] Furthermore, a concave section 13 is provided in the middle of the special-shaped sealing ring 7 , and a gap 14 is formed between the concave section 13 and the sealing ring groove 8 .

[0028] The beneficial effects of such a setting are as follows: the concave section effectively reduces the contact area between the special-shaped sealing ring and the sealing ring groove, reduces friction, and ensures that the special-shaped sealing ring slides more smoothly.

[0029] It is further provided that the valve seat body 6 is slidably arranged in the valve body 1, and a sealing ring 15 and a limit assembly are provided between the valve seat body 6 and the valve body 1, the limit assembly includes a limit end cover 16 and an elastic member 17, the limit end cover 16 is arranged on the side of the valve seat body 6 away from the ball core 2, and the limit end cover 16 is threadedly connected to the inner wall of the valve body 1, one end of the elastic member 17 abuts against the valve seat body 6 and the other end abuts against the limit end cover 16.

[0030] The beneficial effects of this arrangement are as follows: the sealing ring improves the sealing between the valve seat body and the valve body; the elastic member squeezes the valve seat body to slide toward the ball core, so that the valve seat body also has self-compensation performance, further improving the sealing; the limit end cover threadedly connected to the valve body can be adjusted in position by rotation, thereby changing the deformation of the elastic member and providing the valve seat body with a wider self-compensation range.

[0031] It is further provided that a sealing filler 18 and a driving slider 19 are provided between the valve seat body 6 and the elastic member 17. The sealing filler 18 is extruded and arranged between the driving slider 19 and the valve seat body 6. One end of the elastic member 17 abuts against the driving slider 19 and the other end abuts against the limiting end cover 16.

[0032] The beneficial effects of this arrangement are as follows: the driving slider is abutted against the elastic member, and power is transmitted to the valve seat body through the driving slider, ensuring that the valve seat body slides axially. The transmission system is more complete and the transmission is more stable. The sealing packing not only improves the sealing between the driving slider and the valve seat body, but also prevents the valve seat body from being damaged by the friction of the driving slider.

[0033] Furthermore, the valve seat body 6 is further extended with an extension section 20 that fits with the inner wall of the limiting end cover 16 , and the elastic member 17 is two disc springs that abut against each other, and the inner walls of the two disc springs are both in contact with the outer wall of the extension section 20 .

[0034] The beneficial effects of this arrangement are as follows: the extension section is used to limit the radial position of the limit end cover and the elastic member to prevent displacement and misalignment, and ensure the stability of the transmission system. The two disc springs adopt a preset position of reverse adhesion, that is, the ends with smaller inner diameters are against each other, and the ends with smaller inner diameters are sheathed on the outside of the extension section, so that the force on the two disc springs is more uniform, and a stable elastic force is provided along the axial direction.

[0035] It is further provided that a disassembly hole 21 is opened on the end surface of the limiting end cover 16 away from the valve seat body 6.

[0036] The beneficial effect of such a setting is as follows: the disassembly hole can be used for inserting tools to facilitate the rotation of the limiting end cover.

[0037] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A ball valve, comprising a valve body (1), a ball core (2), a valve stem (3) and a drive mechanism (4), wherein a flow channel (5) is provided in the valve body (1), the ball core (2) is arranged in the flow channel (5), the drive mechanism (4) drives the ball core (2) to rotate via the valve stem (3), and a valve seat is further provided in the valve body (1) for sealing with the ball core (2) to separate the flow channel (5), characterized in that: The valve seat comprises a valve seat body (6) and a special-shaped sealing ring (7), wherein the valve seat body (6) is provided with a sealing ring groove (8) in the direction of the ball core (2), the special-shaped sealing ring (7) is arranged in the sealing ring groove (8), and the end of the special-shaped sealing ring (7) is provided with an arc sealing end (9) protruding to the outside of the sealing ring groove (8), and the arc sealing end (9) is used for sealing with the ball core (2), and a drainage hole (10) is also provided on the valve seat body (6), one end of the drainage hole (10) is connected to the sealing ring groove (8) and the other end is connected to the flow channel (5).

2. A ball valve according to claim 1, characterized in that: The end of the special-shaped sealing ring (7) away from the arc sealing end (9) is provided with a blocking end (11), the outer wall of the blocking end (11) is in contact with the inner wall of the sealing ring groove (8), and when the end face of the blocking end (11) is in contact with the bottom wall of the sealing ring groove (8), a corner of the blocking end (11) extends into the drainage hole (10).

3. A ball valve according to claim 1, characterized in that: The drainage hole (10) is provided with a drainage arc surface (12) at an edge of one end close to the flow channel (5).

4. A ball valve according to claim 1, characterized in that: A concave section (13) is further provided in the middle of the special-shaped sealing ring (7), and a gap (14) is formed between the concave section (13) and the sealing ring groove (8).

5. A ball valve according to claim 1, characterized in that: The valve seat body (6) is slidably arranged in the valve body (1), and a sealing ring (15) and a limit assembly are provided between the valve seat body (6) and the valve body (1), and the limit assembly includes a limit end cover (16) and an elastic member (17), the limit end cover (16) is arranged on the side of the valve seat body (6) away from the ball core (2), and the limit end cover (16) is threadedly connected to the inner wall of the valve body (1), and one end of the elastic member (17) abuts against the valve seat body (6) and the other end abuts against the limit end cover (16).

6. A ball valve according to claim 5, characterized in that: A sealing filler (18) and a driving slider (19) are further provided between the valve seat body (6) and the elastic member (17). The sealing filler (18) is extruded and arranged between the driving slider (19) and the valve seat body (6). One end of the elastic member (17) abuts against the driving slider (19) and the other end abuts against the limiting end cover (16).

7. A ball valve according to claim 5, characterized in that: The valve seat body (6) further extends an extension section (20) that fits against the inner wall of the limiting end cover (16); the elastic member (17) is two disc springs that abut against each other, and the inner walls of the two disc springs fit against the outer wall of the extension section (20).

8. The ball valve according to claim 5, characterized in that: A disassembly hole (21) is provided on the end surface of the limiting end cover (16) away from the valve seat body (6).

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