A pneumatic O-type cut-off ball valve

Abstract

The present invention discloses a pneumatic O-type cut-off ball valve, which specifically relates to the technical field of ball valves, including a valve body, a ball, a valve seat and a valve stem. There are two valve seats, which are respectively arranged at the medium input end and the medium output end of the valve body. The circumferential outer walls of the two valve seats are both sleeved with sealing rings, and the two valve seats are symmetrically arranged on both sides of the ball. The present invention provides a protective component. On the one hand, when the medium channel of the valve body is in a closed state, the seal can squeeze the hydraulic oil in the sealing groove into the slide groove, thereby applying a reaction force to the ball through the sealing ring, reducing the pressure difference between the front and rear sides of the ball, preventing the ball from being displaced under the action of a long-term unilateral thrust, reducing the friction of the ball during rotation, and avoiding wear between the ball and the valve stem. On the other hand, the two groups of balls are rotated with the ball, and can achieve sealing by cooperating with the sealing component, thereby further reducing the wear of the ball and further improving the service life of the valve.

Description

Technical Field

[0001] The present invention relates to the technical field of ball valves, and more particularly to a pneumatic O-type cut-off ball valve. Background Art

[0002] ‌Pneumatic O-type cut-off ball valve‌ is a fluid control device widely used in industrial automation control systems. It is mainly used to quickly cut off the flow of fluids to ensure the safety and stable operation of industrial processes. It consists of two parts: a pneumatic actuator and an O-type ball valve, and has the characteristics of high efficiency, fast response and precise control.

[0003] The Chinese patent application number CN202410850507.X discloses a pneumatic fully lined ball valve with a self-cleaning function and a method of using the same, including a valve body, a control box, a self-cleaning component, a control module and a valve ball, wherein a control box is installed at one end of the valve body, a self-cleaning component is installed on the outer wall of the valve body, and the self-cleaning component is used for automatic cleaning of the pneumatic fully lined ball valve, a control module is installed on the top of the control box, and a valve ball is installed on the inner wall of the valve body. The invention is started by installing a moving head to drive the No. 2 rod to move, the No. 2 rod moves to drive the No. 1 spring to move, the No. 1 spring moves to drive the No. 2 rod to move the No. 2 cylinder, the No. 2 cylinder moves to drive the No. 2 rod to drive the sealing plate to move through the No. 1 port, the No. 2 rod moves to drive the arc scraper to move, the arc scraper moves to make it contact with the outer wall of the valve ball, and the dirt on the surface of the valve ball is scraped off during the rotation of the valve ball, thereby achieving the function of scraping off the dirt on the surface of the pneumatic fully lined ball valve to improve the sealing performance during the rotation of the valve ball.

[0004] Although the above invention can scrape off stains and improve the sealing performance during the rotation of the ball valve, when the ball valve is in a closed state, the medium pressure in the valve body will all act on the surface of the ball. When unilateral pressure acts on the surface of the ball for a long time or the pressure is too high, it will cause wear at the connection between the ball and the valve stem, and the position of the ball will be displaced, resulting in increased wear between the ball and the valve seat, affecting the service life and sealing performance of the valve.

[0005] The present invention provides a pneumatic O-type cut-off ball valve, which aims to solve the problem that when the ball valve is in a closed state, unilateral pressure acts on the ball surface for a long time or the pressure is too large, which leads to aggravated wear between the ball and the valve seat, affecting the service life and sealing performance of the valve. Summary of the invention

[0006] The object of the present invention is to provide a pneumatic O-type cut-off ball valve to solve the problem proposed in the above background technology that when the ball valve is in a closed state, unilateral pressure acts on the surface of the ball for a long time or the pressure is too high, which leads to increased wear between the ball and the valve seat, affecting the service life and sealing performance of the valve.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a pneumatic O-type cut-off ball valve, comprising a valve body, a ball, a valve seat and a valve stem, and also comprising: a sealing assembly, which is arranged on the valve seat, the sealing assembly comprising a sealing ring, and the sealing ring can fit with the surface of the ball; a slide groove is provided on the side of the valve seat close to the ball, the sealing ring is slidably connected in the slide groove, and an elastic member is connected between the side of the sealing ring away from the ball and the slide groove; a protection assembly, the protection assembly is arranged in the valve body; the protection assembly comprises a plurality of balls embedded in the side of the valve seat close to the ball, the plurality of balls are equidistantly distributed around the circumference, and the plurality of balls can contact with the surface of the ball and can rotate in conjunction with the ball.

[0008] Preferably, there are two valve seats, which are respectively arranged at the medium input end and the medium output end of the valve body. A sealing groove is provided on the inner side of the medium input end of the valve body, and a sealing member is slidably connected in the sealing groove.

[0009] Preferably, a connecting hole is provided in the slide groove in the valve seat at the medium output end, a pressure injection channel connecting the sealing groove and the connecting hole is provided inside the valve body, and the sealing groove is filled with hydraulic oil.

[0010] Preferably, when the pressure at the medium input end increases, the pressure can push the sealing member to move in the sealing groove, and squeeze the hydraulic oil in the sealing groove into the slide groove through the injection channel and the connecting hole.

[0011] Preferably, the circumferential outer walls of the two valve seats are both sleeved with sealing rings, and the two valve seats are symmetrically arranged on both sides of the sphere.

[0012] Preferably, the valve stem is connected to the sphere, and the valve stem can drive the sphere to rotate when rotating, and a medium channel is provided on the sphere.

[0013] Preferably, a pneumatic actuator for driving the ball and the valve stem to rotate is installed above the valve body.

[0014] Preferably, a limit switch for detecting and feeding back the opening and closing state of the valve is installed above the pneumatic actuator.

[0015] Technical effects and advantages of the present invention: 1. The present invention provides a sealing assembly. When the ball rotates, the sealing ring always fits against the surface of the ball under the thrust of the elastic member to form a seal. When the valve is used for a long time and wear occurs between the sealing ring and the ball, the elastic member can further push the sealing ring out of the slide groove to automatically compensate, thereby ensuring the sealing effect and reducing the number of maintenance and replacement times, thereby increasing the service life of the valve.

[0016] 2. The present invention provides a protective component. On the one hand, when the medium channel of the valve body is in a closed state, the seal can squeeze the hydraulic oil in the sealing groove into the slide groove, thereby applying a reaction force to the ball through the sealing ring, reducing the pressure difference between the front and rear sides of the ball, preventing the ball from being displaced under the action of a long-term unilateral thrust, reducing the friction of the ball during rotation, and avoiding wear between the ball and the valve stem. On the other hand, the two groups of balls can rotate with the ball and can achieve sealing by cooperating with the sealing component, thereby further reducing the wear of the ball and further improving the service life of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a cross-sectional view of the internal structure of the valve body of the present invention.

[0019] Figure 3 It is a cross-sectional view of the internal structure of the sealing groove of the present invention.

[0020] Figure 4 It is an exploded view of the sealing component and the protection component of the present invention.

[0021] Figure 5 It is a cross-sectional view of the internal structure of the valve seat of the present invention.

[0022] Figure 6 It is a schematic diagram of the structure of the valve seat part of the present invention.

[0023] Figure 7 It is a schematic diagram of the partial structure of the sealing ring of the present invention.

[0024] Figure 8 It is a schematic diagram of the sealing structure of the present invention.

[0025] The accompanying drawings are marked as follows: 1. valve body; 2. ball; 3. valve seat; 31. sealing ring; 4. valve stem; 5. sealing assembly; 51. sealing ring; 52. slide groove; 53. elastic part; 6. protection assembly; 61. ball; 62. sealing groove; 63. sealing part; 64. connecting hole; 65. injection pressure channel; 7. pneumatic actuator; 8. limit switch. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Embodiment 1 refer to Figure 1 and Figure 2 A pneumatic O-type cut-off ball valve according to an embodiment of the present invention comprises a valve body 1, a ball 2, a valve seat 3 and a valve stem 4. There are two valve seats 3, which are respectively arranged at the medium input end and the medium output end of the valve body 1. The circumferential outer walls of the two valve seats 3 are sleeved with sealing rings 31. The two valve seats 3 are symmetrically arranged on both sides of the ball 2. The valve stem 4 is connected to the ball 2. When the valve stem 4 rotates, it can drive the ball 2 to rotate. A medium channel is opened on the ball 2. A pneumatic actuator 7 for driving the ball 2 and the valve stem 4 to rotate is installed above the valve body 1. A limit switch 8 for detecting and feeding back the switch state of the valve is installed above the pneumatic actuator 7.

[0028] refer to Figure 2-Figure 7 , and also includes a sealing component 5, which is arranged on the valve seat 3, and the sealing component 5 includes a sealing ring 51, and the sealing ring 51 can fit with the surface of the ball 2 to improve the sealing performance when the ball 2 rotates. A slide groove 52 is opened on the side of the valve seat 3 close to the ball 2, and the sealing ring 51 is slidably connected in the slide groove 52. An elastic member 53 is connected between the side of the sealing ring 51 away from the ball 2 and the slide groove 52.

[0029] In actual use, the valve stem 4 and the ball 2 are driven to rotate by the pneumatic actuator 7 to open and close the medium channel of the valve body 1, and the switch state of the valve is detected and fed back by the limit switch 8.

[0030] During the rotation of the sphere 2, the sealing ring 51 always fits against the surface of the sphere 2 under the thrust of the elastic member 53 to form a seal.

[0031] When the valve is used for a long time and wear occurs between the sealing ring 51 and the ball 2, the elastic member 53 can further push the sealing ring 51 out of the slide groove 52 for automatic compensation to ensure the sealing effect, thereby increasing the service life of the valve.

[0032] It should be noted that when the valve is used for the first time and the medium circulation causes the ball 2 to be subjected to a large instantaneous impact force, the sealing ring 51 located at the medium output end can play a buffering role under the thrust of the elastic member 53, and the sealing ring 51 located at the medium input end can always be in contact with the surface of the ball 2 under the thrust of the elastic member 53 to avoid sealing failure. The elastic member 53 with different elastic coefficients should be replaced according to the medium type and medium pressure to ensure the sealing effect of the valve.

[0033] To sum up, through the setting of the sealing assembly 5, during the rotation of the ball 2, the sealing ring 51 is always in contact with the surface of the ball 2 under the thrust of the elastic member 53 and forms a seal. When the valve is used for a long time and wear occurs between the sealing ring 51 and the ball 2, the elastic member 53 can further push the sealing ring 51 out of the slide groove 52 for automatic compensation, thereby ensuring the sealing effect and reducing the number of maintenance and replacements, thereby increasing the service life of the valve.

[0034] Embodiment 2 During actual use, when the ball valve is in a closed state, the medium pressure in the valve body 1 will all act on the surface of the ball 2. When unilateral pressure acts on the surface of the ball 2 for a long time or the pressure is too high, it will cause wear at the connection between the ball 2 and the valve stem 4, and the position of the ball 2 will be displaced, resulting in increased wear between the ball 2 and the valve seat 3, affecting the service life and sealing performance of the valve. Therefore, this embodiment improves the device described in the above embodiment.

[0035] refer to Figure 2-Figure 8 , also includes a protection component 6, which is arranged in the valve body 1. When the ball 2 closes the valve body 1, the protection component 6 can cooperate with the sealing component 5 to reduce the wear between the ball 2 and the valve seat 3, including a plurality of balls 61 embedded in the valve seat 3 on the side close to the ball 2, the plurality of balls 61 are equidistantly distributed on the circumference, and the plurality of balls 61 can contact the surface of the ball 2 and can cooperate with the ball 2 to rotate. A sealing groove 62 is provided on the inner side of the medium input end of the valve body 1, and a sealing member 63 is slidably connected in the sealing groove 62. A connecting hole 64 is provided in the slide groove 52 in the valve seat 3 at the medium output end. An injection channel 65 connecting the sealing groove 62 and the connecting hole 64 is provided in the interior of the valve body 1. The sealing groove 62 is filled with hydraulic oil. When the pressure at the medium input end increases, the pressure can push the sealing member 63 to move in the sealing groove 62, and squeeze the hydraulic oil in the sealing groove 62 into the slide groove 52 through the injection channel 65 and the connecting hole 64.

[0036] In actual use, when the medium channel of the valve body 1 is in a closed state, the pressure at the medium input end of the valve body 1 will increase, and the pressure will act on the seal 63, thereby pushing the seal 63 to move in the sealing groove 62, and squeezing the hydraulic oil in the sealing groove 62 into the slide groove 52 located at the medium output end through the injection channel 65 and the connecting hole 64, thereby applying pressure to the sealing ring 51 located at the medium output end, applying a reaction force to the ball 2. The greater the pressure, the more hydraulic oil is squeezed into the slide groove 52 by the seal 63, and the greater the reaction force applied to the ball 2, thereby reducing the pressure difference between the front and rear sides of the ball 2 and preventing the ball 2 from being displaced under the action of unilateral thrust for a long time.

[0037] It should be noted that in order to reduce the friction of the ball 2 during rotation, multiple balls 61 are installed on the side of the two valve seats 3 close to the ball 2. The force generated by the ball 2 during switching will act on the two groups of balls 61, so that the two groups of balls 61 rotate with the ball 2 and can achieve sealing by cooperating with the sealing assembly 5, thereby further reducing the wear of the ball 2 and further improving the service life of the valve.

[0038] To sum up, through the setting of the protection component 6, on the one hand, when the medium channel of the valve body 1 is in a closed state, the seal 63 can squeeze the hydraulic oil in the sealing groove 62 into the slide groove 52, thereby applying a reaction force to the ball 2 through the sealing ring 51, reducing the pressure difference between the front and rear sides of the ball 2, preventing the ball 2 from being displaced under the action of unilateral thrust for a long time, reducing the friction of the ball 2 during rotation, and avoiding wear between the ball 2 and the valve stem 4. On the other hand, the two groups of balls 61 rotate with the ball 2 and can achieve sealing by cooperating with the sealing component 5, thereby further reducing the wear of the ball 2 and further improving the service life of the valve.

[0039] Finally: 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. A pneumatic O-type cut-off ball valve, comprising a valve body (1), a ball (2), a valve seat (3) and a valve stem (4), characterized in that: Also includes: A sealing assembly (5) arranged on the valve seat (3), the sealing assembly (5) comprising a sealing ring (51), the sealing ring (51) being capable of fitting against the surface of the ball (2); a sliding groove (52) is provided on a side of the valve seat (3) close to the ball (2), the sealing ring (51) being slidably connected in the sliding groove (52), and an elastic member (53) being connected between a side of the sealing ring (51) away from the ball (2) and the sliding groove (52); A protection component (6), the protection component (6) being arranged in the valve body (1), the protection component (6) comprising a plurality of balls (61) embedded in the valve seat (3) on a side close to the sphere (2), the plurality of balls (61) being distributed equidistantly around the circumference, and the plurality of balls (61) being able to contact the surface of the sphere (2) and being able to rotate in coordination with the sphere (2).

2. The pneumatic O-type cut-off ball valve according to claim 1 is characterized in that: There are two valve seats (3), which are respectively arranged at the medium input end and the medium output end of the valve body (1). A sealing groove (62) is provided on the inner side of the medium input end of the valve body (1), and a sealing member (63) is slidably connected in the sealing groove (62).

3. The pneumatic O-type cut-off ball valve according to claim 2 is characterized in that: A connecting hole (64) is provided in the slide groove (52) in the valve seat (3) at the medium output end, and a pressure injection channel (65) connecting the sealing groove (62) and the connecting hole (64) is provided inside the valve body (1), and the sealing groove (62) is filled with hydraulic oil.

4. The pneumatic O-type cut-off ball valve according to claim 3 is characterized in that: When the pressure at the medium input end increases, the pressure can push the sealing member (63) to move in the sealing groove (62), and squeeze the hydraulic oil in the sealing groove (62) into the slide groove (52) through the injection channel (65) and the connecting hole (64).

5. The pneumatic O-type cut-off ball valve according to claim 4, characterized in that: The circumferential outer walls of the two valve seats (3) are both sleeved with sealing rings (31), and the two valve seats (3) are symmetrically arranged on both sides of the sphere (2).

6. The pneumatic O-type cut-off ball valve according to claim 5, characterized in that: The valve stem (4) is connected to the sphere (2); when the valve stem (4) rotates, it can drive the sphere (2) to rotate; a medium channel is provided on the sphere (2).

7. The pneumatic O-type cut-off ball valve according to claim 6, characterized in that: A pneumatic actuator (7) is installed above the valve body (1) and is used to drive the ball (2) and the valve stem (4) to rotate.

8. The pneumatic O-type cut-off ball valve according to claim 7, characterized in that: A limit switch (8) for detecting and providing feedback on the opening and closing state of the valve is installed above the pneumatic actuator (7).

Images