阅读说明：本技术 带背压卸载结构的球阀 (Ball valve with backpressure unloading structure ) 是由 柯志武 柳勇 林原胜 赵振兴 李邦明 柯汉兵 劳星胜 于 2019-11-29 设计创作，主要内容包括：本发明公开了一种带背压卸载结构的球阀,涉及阀门驱动技术领域,包括：阀球、阀座、增压座以及阀体；所述阀座和增压座位于所述阀体内,所述阀座、增压座和阀体之间相互滑动密封配合,所述阀座、增压座与阀体在密封配合处形成第一封闭腔；所述增压座与阀体之间形成第二封闭腔；所述阀座包括靠近所述阀球的阀座后端,所述阀座后端上设有与所述阀球配合的密封环,所述密封环将所述阀体的内腔分隔为前腔和后腔；所述阀体上设有流道,球阀开启过程中,所述流道使所述第一封闭腔密封,且所述后腔与第二封闭腔导通,所述增压座移动压缩所述第一封闭腔内的介质以驱使所述阀座移动,以使所述密封环与阀球脱离。本发明的球阀能够减小球阀开启所需的力矩。(The invention discloses a ball valve with a back pressure unloading structure, which relates to the technical field of valve driving and comprises the following components: the valve comprises a valve ball, a valve seat, a pressurizing seat and a valve body; the valve seat and the pressurizing seat are positioned in the valve body, the valve seat, the pressurizing seat and the valve body are in sliding sealing fit with each other, and a first closed cavity is formed at the sealing fit position of the valve seat, the pressurizing seat and the valve body; a second closed cavity is formed between the pressurizing seat and the valve body; the valve seat comprises a valve seat rear end close to the valve ball, a sealing ring matched with the valve ball is arranged on the valve seat rear end, and the sealing ring divides the inner cavity of the valve body into a front cavity and a rear cavity; the valve body is provided with a flow passage, the flow passage seals the first closed cavity and leads the rear cavity to be communicated with the second closed cavity in the opening process of the ball valve, and the pressurizing seat moves and compresses a medium in the first closed cavity to drive the valve seat to move so as to separate the sealing ring from the ball valve. The ball valve can reduce the moment required by opening the ball valve.)

1. A ball valve with a back pressure relief structure, comprising: the valve comprises a valve ball (1), a valve seat (2), a pressurizing seat (3) and a valve body (4);

the valve seat (2) and the pressurizing seat (3) are positioned in the valve body (4), the valve seat (2), the pressurizing seat (3) and the valve body (4) are in sliding sealing fit with each other, and a first closed cavity (5) is formed at the sealing fit position of the valve seat (2), the pressurizing seat (3) and the valve body (4); a second closed cavity (6) is formed between the pressurizing seat (3) and the valve body (4); the valve seat (2) comprises a valve seat rear end (220) close to the valve ball (1), a sealing ring (7) matched with the valve ball (1) is arranged on the valve seat rear end (220), and the sealing ring (7) divides the inner cavity of the valve body (4) into a front cavity (100) and a rear cavity (200);

a flow passage is arranged on the valve body (4), and the flow passage and the pressurizing seat (3) are configured as follows: in the opening process of the ball valve, the flow passage enables the first closed cavity (5) to be sealed, the rear cavity (200) is communicated with the second closed cavity (6), the pressurizing seat (3) moves to compress media in the first closed cavity (5) to drive the valve seat (2) to move, so that the sealing ring (7) is separated from the valve ball (1), and the front cavity (100) is communicated with the rear cavity (200).

2. The ball valve with a back pressure unloading structure as set forth in claim 1, wherein:

the valve seat (2) is of an annular stepped shaft structure and is provided with a first valve seat outer ring surface (21), a second valve seat outer ring surface (22) and a first valve seat inner hole surface (23);

the supercharging seat (3) is of an annular stepped shaft structure and is provided with a first supercharging seat outer ring surface (31), a second supercharging seat outer ring surface (32) and a first supercharging seat inner hole surface (33), and the first supercharging seat inner hole surface (33) is in sliding sealing fit with the second valve seat outer ring surface (22);

the valve body (4) is provided with a first valve body inner hole surface (44), a second valve body inner hole surface (45) and a third valve body inner hole surface (46), the first valve body inner hole surface (44) is in sliding sealing fit with the first valve seat outer ring surface (21), the second valve body inner hole surface (45) is in sliding sealing fit with the first booster seat outer ring surface (31), the third valve body inner hole surface (46) is in sliding sealing fit with the second booster seat outer ring surface (32), the first valve body inner hole surface (44) and the second valve body inner hole surface (45) form a first closed cavity (5) with the valve seat (2) and the booster seat (3), and the second valve body inner hole surface (45) and the third valve body inner hole surface (46) form a second closed cavity (6) with the booster seat (3).

3. The ball valve with a back pressure unloading structure as set forth in claim 2, wherein:

the area of an annular end surface between the first valve seat outer annular surface (21) and the second valve seat outer annular surface (22) is S1;

the area of an annular end surface between the first supercharging seat outer annular surface (31) and the first supercharging seat inner hole surface (33) is S2;

the area of an annular end surface between the outer annular surface (32) of the second supercharging seat and the inner hole surface (33) of the first supercharging seat is S3;

the area of an annular end surface between the outer annular surface (22) of the second valve seat and the inner hole surface (23) of the first valve seat is S4;

wherein S1 × S3> S2 × S4.

4. The ball valve with a back pressure unloading structure as set forth in claim 1, wherein:

still be equipped with a control valve (8) on valve body (4), the runner includes first runner (41), second runner (42) and third runner (43), the one end of first runner (41), second runner (42) and third runner (43) all with control valve (8) are connected, the other end of first runner (41) with back chamber (200) switch on, the other end of second runner (42) with first closed chamber (5) switch on, the other end of third runner (43) with second closed chamber (6) switch on.

5. The ball valve with a back pressure unloading structure as set forth in claim 4, wherein: the control valve (8) is a two-position three-way electromagnetic valve.

6. The ball valve with a back pressure unloading structure as set forth in claim 1, wherein: the ball valve further comprises a limiting ring (9) for limiting the positions of the valve seat (2) and the pressurizing seat (3), and the limiting ring (9) is fixed on the valve body (4).

7. The ball valve with a back pressure unloading structure as set forth in claim 6, wherein: and the limiting ring (9) is provided with a through hole (91) for fixing a fastener.

8. The ball valve with a back pressure unloading structure as set forth in claim 1, wherein: and a return spring (10) is arranged in the second closed cavity (6), and two ends of the return spring (10) respectively abut against the pressurizing seat (3) and the valve body (4).

9. The ball valve with a back pressure unloading structure as set forth in claim 8, wherein: the number of the return springs (10) is multiple, and the return springs (10) are annularly and uniformly distributed in the second closed cavity (6).

10. The ball valve with a back pressure unloading structure as set forth in claim 1, wherein: the rear end of the valve seat is provided with an annular groove, the sealing ring (7) is installed in the annular groove, and the side, close to the valve ball (1), of the sealing ring (7) is arc-shaped.

Technical Field

The invention relates to the technical field of valve driving, in particular to a ball valve with a back pressure unloading structure.

Background

The ball valve has wide application in the fields of petroleum, chemical industry, energy, mineral products and the like, is an important component in industrial pipelines, and has the main function of quickly isolating a damaged pipe section when the pipeline leaks so as to ensure the safety of the pipeline and field personnel.

In a high-pressure pipeline, the pressure difference between the front and the back of a ball valve when the ball valve is closed is particularly large (the pressure before the ball valve is P1, the pressure after the ball valve is 0, and P1 is far more than 0), the valve ball of the ball valve is tightly pressed on a valve rod under the pressure of a medium, so that the valve can be opened only by large driving moment, and a high-power valve opening device needs to be equipped, thus the purchase cost of equipment is greatly increased, and the total weight and the volume of the valve are also increased. Meanwhile, when the ball valve is opened at every time, the sealing ring on the valve seat can rub with the surface of the ball body under high acting force, so that the sealing ring is easily worn and loses efficacy, and the valve fault is caused.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a ball valve with a backpressure unloading structure, which is used for solving the problem that the ball valve in the prior art needs a large driving moment to open.

In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: a ball valve with a back pressure relief structure, comprising: the valve comprises a valve ball, a valve seat, a pressurizing seat and a valve body;

the valve seat and the pressurizing seat are positioned in the valve body, the valve seat, the pressurizing seat and the valve body are in sliding sealing fit with each other, and a first closed cavity is formed at the sealing fit position of the valve seat, the pressurizing seat and the valve body; a second closed cavity is formed between the pressurizing seat and the valve body; the valve seat comprises a valve seat rear end close to the valve ball, a sealing ring matched with the valve ball is arranged on the valve seat rear end, and the sealing ring divides the inner cavity of the valve body into a front cavity and a rear cavity;

a flow passage is arranged on the valve body, and the flow passage and the pressurizing seat are configured as follows: in the opening process of the ball valve, the flow channel enables the first closed cavity to be sealed, the rear cavity is communicated with the second closed cavity, the pressurizing seat moves to compress a medium in the first closed cavity to drive the valve seat to move, so that the sealing ring is separated from the ball valve, and the front cavity is communicated with the rear cavity.

On the basis of the technical scheme, the valve seat is of an annular stepped shaft structure and is provided with a first valve seat outer ring surface, a second valve seat outer ring surface and a first valve seat inner hole surface;

the supercharging seat is of an annular stepped shaft structure and is provided with a first supercharging seat outer ring surface, a second supercharging seat outer ring surface and a first supercharging seat inner hole surface, and the first supercharging seat inner hole surface is in sliding sealing fit with the second valve seat outer ring surface;

the valve body is provided with a first valve body inner hole surface, a second valve body inner hole surface and a third valve body inner hole surface, the first valve body inner hole surface is in sliding sealing fit with the first valve seat outer ring surface, the second valve body inner hole surface is in sliding sealing fit with the first booster seat outer ring surface, the third valve body inner hole surface is in sliding sealing fit with the second booster seat outer ring surface, the first valve body inner hole surface and the second valve body inner hole surface form a first closed cavity together with the valve seat and the booster seat, and the second valve body inner hole surface and the third valve body inner hole surface form a second closed cavity together with the booster seat.

On the basis of the technical scheme, the area of an annular end surface between the outer annular surface of the first valve seat and the outer annular surface of the second valve seat is S1;

the area of an annular end surface between the outer annular surface of the first supercharging seat and the inner hole surface of the first supercharging seat is S2;

the area of an annular end surface between the outer annular surface of the second supercharging seat and the inner hole surface of the first supercharging seat is S3;

the area of an annular end surface between the outer annular surface of the second valve seat and the inner hole surface of the first valve seat is S4;

wherein S1 × S3> S2 × S4.

On the basis of the technical scheme, the valve body is further provided with a control valve, the flow channel comprises a first flow channel, a second flow channel and a third flow channel, one ends of the first flow channel, the second flow channel and the third flow channel are connected with the control valve, the other end of the first flow channel is communicated with the rear cavity, the other end of the second flow channel is communicated with the first closed cavity, and the other end of the third flow channel is communicated with the second closed cavity.

On the basis of the technical scheme, the control valve is a two-position three-way electromagnetic valve.

On the basis of the technical scheme, the ball valve further comprises a limiting ring for limiting the positions of the valve seat and the pressurizing seat, and the limiting ring is fixed on the valve body.

On the basis of the technical scheme, the limiting ring is provided with a through hole for fixing the fastener.

On the basis of the technical scheme, a return spring is arranged in the second closed cavity, and two ends of the return spring respectively support the pressurizing seat and the valve body.

On the basis of the technical scheme, the number of the return springs is multiple, and the return springs are annularly and uniformly distributed in the second closed cavity.

On the basis of the technical scheme, the rear end of the valve seat is provided with an annular groove, the sealing ring is installed in the annular groove, and the side, close to the valve ball, of the sealing ring is arc-shaped.

Compared with the prior art, the invention has the advantages that:

according to the ball valve with the backpressure unloading structure, in the process of opening the ball valve, the medium in the first closed cavity is compressed and the valve seat is driven through the movement of the pressurizing seat, so that the sealing ring is separated from the ball valve, the front cavity is communicated with the rear cavity, the pressure difference between the front and the rear of the ball valve is greatly reduced, the moment required by opening the ball valve is reduced, the power parameter of an opening device in the ball valve is reduced, the equipment purchase cost is saved, and the total volume and the weight of the ball valve are reduced. Meanwhile, the valve ball is separated from the sealing ring, so that strong friction between the sealing ring and the surface of the valve ball is avoided in the opening process of the ball valve, the abrasion of the sealing ring is reduced, the service life of the valve is prolonged, and the failure rate of the ball valve is reduced.

Drawings

FIG. 1 is a schematic structural view of a ball valve with a back pressure relief structure in an embodiment of the present invention;

FIG. 2 is another schematic diagram of a ball valve with a back pressure relief feature according to an embodiment of the present invention;

FIG. 3 is a schematic illustration of the areas of the end faces of the booster seat and the valve seat in an embodiment of the invention;

FIG. 4 is a force diagram of a booster seat during opening of a ball valve in an embodiment of the present invention;

FIG. 5 is a force diagram of a valve seat during opening of a ball valve according to an embodiment of the present invention;

FIG. 6 is a force diagram of a valve seat with a ball valve closed according to an embodiment of the present invention;

FIG. 7 is a force diagram of the booster seat after the ball valve is fully opened in an embodiment of the present invention;

in the figure: 1. a valve ball; 2. a valve seat; 21. a first valve seat outer annular surface; 22. an outer annular surface of the second valve seat; 220. a valve seat rear end; 23. a first valve seat inner bore surface; 3. a pressurizing seat; 31. an outer annular surface of the first booster seat; 32. an outer annular surface of the second booster seat; 33. the inner hole surface of the first supercharging seat; 4. a valve body; 41. a first flow passage; 42. a second flow passage; 43. a third flow path; 44. a first valve body inner bore surface; 45. a second valve body inner bore surface; 46. a third valve body inner hole surface; 5. a first closed cavity; 6. a second closed cavity; 7. a seal ring; 8. a control valve; 9. a limiting ring; 91. a through hole; 10. a return spring; 100. a front cavity; 200. a rear cavity.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Referring to fig. 1, an embodiment of the present invention provides a ball valve with a back pressure unloading structure, including: a valve ball 1, a valve seat 2, a booster seat 3 and a valve body 4.

The valve seat 2 and the pressurizing seat 3 are positioned in the valve body 4, the valve seat 2, the pressurizing seat 3 and the valve body 4 are in sliding sealing fit with each other, and a first closed cavity 5 is formed at the sealing fit position of the valve seat 2, the pressurizing seat 3 and the valve body 4; a second closed cavity 6 is formed between the pressurizing seat 3 and the valve body 4; the valve seat 2 comprises a valve seat front end 210 far away from the valve ball 1 and a valve seat rear end 220 close to the valve ball 1, a sealing ring 7 matched with the valve ball 1 is arranged on the valve seat rear end 220, and the sealing ring 7 divides the inner cavity of the valve body 4 into a front cavity 100 and a rear cavity 200.

Specifically, referring to fig. 1 and 2, the valve seat 2 is an annular stepped shaft structure provided with a first valve seat outer annular surface 21, a second valve seat outer annular surface 22, and a first valve seat inner bore surface 23. The booster seat 3 is of an annular stepped shaft structure, and is provided with a first booster seat outer annular surface 31, a second booster seat outer annular surface 32 and a first booster seat inner hole surface 33, wherein the first booster seat inner hole surface 33 is in sliding sealing fit with the second valve seat outer annular surface 22. The valve body 4 is provided with a first valve body inner hole surface 44, a second valve body inner hole surface 45 and a third valve body inner hole surface 46, the first valve body inner hole surface 44 is in sliding sealing fit with the first valve seat outer ring surface 21, the second valve body inner hole surface 45 is in sliding sealing fit with the first booster seat outer ring surface 31, the third valve body inner hole surface 46 is in sliding sealing fit with the second booster seat outer ring surface 32, the first valve body inner hole surface 44 and the second valve body inner hole surface 45 form a first closed cavity 5 with the valve seat 2 and the booster seat 3, and the second valve body inner hole surface 45 and the third valve body inner hole surface 46 form a second closed cavity 6 with the booster seat 3.

Referring to fig. 1, the valve body 4 is provided with a flow passage, and the flow passage and the pressurizing seat 3 are configured as follows: in the opening process of the ball valve, the flow channel seals the first closed cavity 5, the rear cavity 200 is communicated with the second closed cavity 6, the pressurizing seat 3 moves to compress a medium in the first closed cavity 5 and drive the valve seat 2, so that the sealing ring 7 is separated from the valve ball 1, and the front cavity 100 is communicated with the rear cavity 200. Specifically, the valve body 4 is further provided with a control valve 8, the flow channels include a first flow channel 41, a second flow channel 42 and a third flow channel 43, one ends of the first flow channel 41, the second flow channel 42 and the third flow channel 43 are all connected with the control valve 8, the other end of the first flow channel 41 is communicated with the rear cavity, the other end of the second flow channel 42 is communicated with the first closed cavity 5, and the other end of the third flow channel 43 is communicated with the second closed cavity 6. Preferably, the control valve 8 is a two-position three-way electromagnetic valve, and during the opening process of the ball valve, the two-position three-way electromagnetic valve makes the first flow passage 41 and the third flow passage 43 conducted, that is, the back chamber 200 is conducted with the second closing chamber 6, and the first closing chamber 5 is sealed. After the ball valve is opened, the two-position three-way solenoid valve still conducts the first flow passage 41 and the third flow passage 43, that is, the rear cavity 200 is conducted with the second closed cavity 6, and the first closed cavity 5 is sealed. During closing of the ball valve, the two-position three-way solenoid valve enables the first flow passage 41 and the second flow passage 42 to be communicated, namely the rear cavity 200 is communicated with the first closing cavity 5, and the second closing cavity 6 is sealed. When the ball valve is closed, the two-position three-way solenoid valve makes the first flow passage 41 and the second flow passage 42 conducted, that is, the back cavity 200 is conducted with the first closing cavity 5, and the second closing cavity 6 is sealed.

Further, referring to fig. 3, the area of the annular end surface between the first and second valve seat outer annular surfaces 21 and 22 is S1, the area of the annular end surface between the first booster seat outer annular surface 31 and the first booster seat inner hole surface 33 is S2, the area of the annular end surface between the second booster seat outer annular surface 32 and the first booster seat inner hole surface 33 is S3, and the area of the annular end surface between the second valve seat outer annular surface 22 and the first valve seat inner hole surface 23 is S4, where S1 × S3> S2 × S4.

Referring to fig. 1, a return spring 10 is disposed in the second sealing chamber 6, and two ends of the return spring 10 respectively support the pressurizing seat 3 and the valve body 4. The return springs 10 are multiple, and the return springs 10 are annularly and uniformly distributed in the second closed cavity 6. After the ball valve is completely opened, the front pressure and the rear pressure of the ball valve 1 are equivalent, the pressure in the rear cavity 200 is also changed into P1, the pressure in the second closing cavity 6 is also changed into P1 at the moment, the stress condition of the pressure boosting seat 3 is shown in figure 7, and the pressure boosting seat 3 is reset under the driving of the return spring 10 to prepare for opening the ball valve next time. A plurality of reset springs 10 are annularly and uniformly distributed, and the force acting on the pressurizing seat 3 is more balanced.

The ball valve with the backpressure unloading structure provided by the embodiment of the invention has the following working principle:

referring to fig. 1, in the process of opening the ball valve, the medium pressure of the front chamber 100 is P1, the medium pressure of the rear chamber 200 is 0, the control valve 8 makes the first flow passage 41 and the third flow passage 43 communicate, that is, the rear chamber 200 communicates with the second closing chamber 6, the first closing chamber 5 is sealed, and the medium pressure of the second closing chamber 6 is 0. Referring to fig. 4, the booster seat 3 moves under the medium of the front cavity 100 to compress the medium of the first closing cavity 5, so that the medium pressure of the first closing cavity 5 is increased to P2, and referring to fig. 4, according to the force balance principle of the booster seat 3, P2 × S2 is equal to P1 × S3. Since S1 × S3> S2 × S4, P2 × S2 and P1 × S3 are respectively substituted into the unequal number left and right sides, P2 × S1> P1 × S4. In addition, referring to fig. 3, assuming that the area of the annular end surface of the valve seat rear end 220 located inside the seal ring 7 is S5, it is inevitable that P2 × S1+ P1 × S5> P1 × S4 is also established, and considering the influence of S5, it is understood that P2 × S1> P1 × S4 can be realized as long as S1 × S3> S2 × (S4-S5). Under the condition that the rear end 220 of the valve seat is stressed greatly, namely the medium in the first closed cavity 5 drives the valve seat 2 to move, the sealing ring 7 is separated from the valve ball 1, the front cavity 100 is communicated with the rear cavity 200, the front-rear pressure difference of the valve ball 1 is greatly reduced, and then the valve rod of the ball valve is driven by external force to rotate to open the valve.

After the ball valve is opened, the control valve 8 still enables the first flow passage 41 and the third flow passage 43 to be communicated, namely the rear cavity 200 is communicated with the second closed cavity 6, the first closed cavity 5 is sealed, the medium pressure of the second closed cavity 6 is P1, the stress condition of the pressure boost seat 3 is shown in fig. 7, the pressure boost seat 3 is reset under the driving of the reset spring 10 to prepare for opening the ball valve next time, the first flow passage 41 is communicated with the second flow passage 42 through the control valve 8, namely the rear cavity 200 is communicated with the first closed cavity 5, and the second closed cavity 6 is sealed.

And in the process of closing the ball valve, the valve rod of the ball valve is driven to rotate by external force to close the valve. The medium pressure of the front chamber 100 is P1, the medium pressure of the back chamber 200 is converted from P1 to 0, the control valve 8 makes the first flow passage 41 and the second flow passage 42 communicated, i.e. the back chamber 200 is communicated with the first closed chamber 5, the second closed chamber 6 is sealed, and the medium pressure of the first closed chamber 5 is converted from P1 to 0.

When the ball valve is closed, the medium pressure in the front chamber 100 is P1, the medium pressure in the back chamber 200 is 0, and as shown in fig. 6, the control valve 8 makes the first flow passage 41 and the second flow passage 42 communicate, that is, the back chamber 200 communicates with the first closing chamber 5, the second closing chamber 6 is sealed, and the medium pressure in the first closing chamber 5 is 0. The valve seat 2 moves towards the valve ball 1 under the medium thrust of the front cavity 100, and the sealing ring 7 is tightly pressed on the valve ball 1 to form reliable sealing, so that the medium in the front cavity 100 cannot flow through the ball valve.

Compared with the prior art, in the ball valve with the backpressure unloading structure, in the process of opening the ball valve, the medium in the first closed cavity 5 is compressed by moving the pressurizing seat 3 and the valve seat 2 is driven, so that the sealing ring 7 is separated from the valve ball 1, the front cavity 100 is communicated with the rear cavity 200, the pressure difference between the front and the rear of the valve ball 1 is greatly reduced, the moment required by opening the ball valve is reduced, the power parameter of an opening device in the ball valve is reduced, the purchase cost of equipment is saved, and the total volume and the weight of the ball valve are reduced. Meanwhile, the valve ball 1 is separated from the sealing ring 7, so that strong friction between the sealing ring 7 and the surface of the valve ball 1 is avoided in the opening process of the ball valve, the abrasion of the sealing ring 7 is reduced, the service life of the valve is prolonged, and the failure rate of the ball valve is reduced.

As a preferred embodiment, the ball valve further comprises a limiting ring 9 for limiting the positions of the valve seat 2 and the pressurizing seat 3, the limiting ring 9 is fixed on the valve body, and a through hole 91 for fixing a fastener is formed in the limiting ring 9.

As preferred embodiment, the disk seat rear end is equipped with the annular groove, and sealing ring 7 installs in the annular groove, and sealing ring 7 is pressed close to valve ball 1 side and is the arc, and the arc structure more matches with valve ball 1's appearance, and sealed effect is better.

The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.