Backflow prevention ball valve

Abstract

The anti-backflow ball valve comprises a valve body and a valve rod, a valve cavity is formed in the valve body, a ball body is arranged in the valve cavity, a circulation opening is formed in the center of the ball body, and the positions, corresponding to the circulation opening, of the left valve body and the right valve body are provided with an inflow channel and an outflow channel respectively. Backflow prevention devices are arranged in the inflow channel and the outflow channel, each backflow prevention device comprises a fixing part, a fixing block is fixedly arranged on one side of the fixing part, an embedded groove is formed in the side, away from the fixing part, of the fixing block, an elastic groove is formed in the embedded groove in a communicating mode, a movable block is arranged in the embedded groove, and the elastic groove is communicated with the movable block. An elastic part is arranged in the elastic groove, a sealing plate is fixedly arranged on the side, away from the elastic part, of the moving block, and annular plates are fixedly arranged at the positions, corresponding to the sealing plate, of the inner side of the inflow channel and the inner side of the outflow channel. The backflow preventing device can effectively prevent media from flowing back, plays a role in protecting the ball body and the pipeline, and is not easy to damage.

Description

Technical Field

[0001] The utility model relates to the technical field of ball valves, and more specifically to an anti-backflow ball valve. Background Art

[0002] A ball valve refers to a valve that uses a sphere with a circular through hole as an opening and closing piece. The ball rotates with the valve stem to achieve opening and closing actions. It is a control component in a pipeline fluid delivery system and can be used for fluid regulation and control to change the passage cross-section and medium flow direction. It is mainly divided into pneumatic ball valves, electric ball valves, manual ball valves and other types. It has functions such as diversion, cut-off, throttling, and diversion. It is wear-resistant, has good sealing performance and a long service life. When the existing ball valve is closed, backflow is likely to occur due to the sudden change in pressure on both sides of the valve and the time delay in closing the valve. The pressure generated by the backflow of the medium is likely to cause damage to the pipeline and the ball.

[0003] In the prior art, a new type of ball valve with internal backflow is disclosed with publication number CN208348556U. The valve is provided with a water-blocking baffle, which is a convex structure on the side of the water inlet and can intercept the backflowing medium to prevent the medium from backflowing. However, the utility model still has the following problems: the water-blocking baffle will be impacted and pushed away during the flow of the medium, which may easily cause the water-blocking baffle to be damaged by a large impact. In addition, the water-blocking baffle is only provided at the water inlet, which can only prevent the medium from backflowing, thereby protecting one side of the water inlet pipe. However, the impact of the backflow of the medium on the side of the water outlet pipe will also impact the ball itself and cause it to be damaged. Therefore, the utility model proposes an anti-backflow ball valve. Utility Model Content

[0004] The utility model aims to provide a backflow prevention ball valve, which can effectively prevent the backflow of the medium, play the role of protecting the ball and the pipeline, and the backflow prevention device is not easy to be damaged.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A backflow prevention ball valve comprises a valve body and a valve stem, wherein the valve body is fixedly connected by a left valve body and a right valve body through bolts, a valve cavity is arranged in the valve body, a ball is arranged in the valve cavity, the lower end of the valve stem passes through the valve body and is fixedly connected to the upper end of the ball, the upper end of the valve stem is fixedly connected to a handle, valve seats are fixedly arranged inside the left valve body and the right valve body at both ends of the ball, the valve seats abut against the ball, a flow opening is arranged at the center of the ball, an inflow channel and an outflow channel are respectively arranged at positions corresponding to the flow opening, the inflow channel and the An anti-backflow device is provided in the outflow channel, and the anti-backflow device includes a fixed part, a fixed block is fixedly provided on one side of the fixed part, an embedded groove is provided on the side of the fixed block away from the fixed part, an elastic groove is provided in the embedded groove, a moving block is provided in the embedded groove, an elastic part is provided in the elastic groove, a sealing plate is fixedly provided on the side of the moving block away from the elastic part, annular plates are fixedly provided at positions corresponding to the sealing plates on the inner sides of the inflow channel and the outflow channel, the annular plate is abutted against the sealing plate, and a buffer part is provided on the side of the sealing plate close to the annular plate.

[0007] By adopting the above technical solution, the utility model has the following advantages:

[0008] The utility model is provided with an anti-backflow device for both the inflow channel and the outflow channel, so that when the ball valve is closed, the backflow generated on both sides of the ball can be eliminated, thereby effectively protecting the ball and the pipeline; the utility model is provided with the sealing plate, the annular plate and the elastic part, so that when the ball valve is opened, the medium can flow out of the annular plate by squeezing the sealing plate, and when the ball valve is closed, the elastic part will make the sealing plate return to its position and resist against the annular plate, thereby effectively preventing the medium from flowing back and protecting the pipeline and the ball; the utility model is provided with the buffer part, which can effectively buffer the impact force generated on the sealing plate when the medium flows, thereby protecting the sealing plate, thereby making the anti-backflow device not easy to be damaged.

[0009] Furthermore, the annular plates are all close to one side of the inflow channel, and the fixing parts are all close to one side of the outflow channel.

[0010] By adopting the above technical solution, the utility model has the following advantages:

[0011] The annular plates of the utility model are all close to one side of the inflow channel, and the fixing parts are all close to one side of the outflow channel, so that the medium can be prevented from flowing back in both the inflow channel and the outflow channel.

[0012] Furthermore, an inclined surface is provided on a side of the annular plate away from the sealing plate.

[0013] By adopting the above technical solution, the utility model has the following advantages:

[0014] The arrangement of the inclined surface of the utility model makes the medium flow more smoothly.

[0015] Furthermore, the fixing part includes a center plate, one side of the center plate is fixedly connected to one side of the fixing block, a plurality of support columns are fixedly provided around the center plate, and one end of the support column away from the center plate is fixedly connected to the left valve body and the right valve body respectively.

[0016] By adopting the above technical solution, the utility model has the following advantages:

[0017] The arrangement of the central plate and the supporting columns of the utility model plays a role in fixing the fixing blocks.

[0018] Furthermore, a through groove is provided on one side of the sealing plate close to the annular plate, an inner groove is provided in the through groove, the buffer portion includes a buffer plate and two high-elastic springs, the buffer plate is clamped in the inner groove, a plurality of the two high-elastic springs are fixed between the buffer plate and the inner groove, and the through groove corresponds to the inner ring of the annular plate.

[0019] By adopting the above technical solution, the utility model has the following advantages:

[0020] The arrangement of the buffer plate and the second high-elastic spring of the utility model enables the medium to impact the buffer plate when it flows, and the second high-elastic spring will consume a certain impact force, thereby reducing the impact of the medium on the buffer plate and playing a role in protecting the sealing plate.

[0021] Furthermore, an annular sleeve is provided on a side of the sealing plate away from the annular plate, the annular sleeve is in a bell-mouth shape, and the diameter of the annular sleeve on a side close to the sealing plate is greater than the diameter of the side away from the sealing plate.

[0022] By adopting the above technical solution, the utility model has the following advantages:

[0023] The annular sleeve of the utility model can make the medium flow more smoothly with the inclination of the annular sleeve when the medium flows normally, and when the medium flows back, the annular sleeve will be pocketed inside to prevent the medium from flowing back.

[0024] Furthermore, the elastic part includes a movable plate and a high-elastic spring 1, one side of the movable plate is fixedly connected to one side of the movable block, and the high-elastic spring 1 is fixedly arranged between the movable plate and the elastic groove.

[0025] By adopting the above technical solution, the utility model has the following advantages:

[0026] The high-elastic spring and the movable plate of the utility model can impact the sealing plate when the medium flows, so that the sealing plate is pressed toward the high-elastic spring. When the medium stops flowing, the elastic force of the high-elastic spring can return the sealing plate to its original position, thereby preventing the medium from flowing back.

[0027] Furthermore, the left valve body and the right valve body are provided with a side ring groove 1 on one side of the valve seat, and the left valve body and the right valve body are provided with a side ring groove 2 on one side of the outer ring of the valve seat, and a plurality of high-elastic springs 3 are fixedly provided in the side ring groove 1 and the side ring groove 2.

[0028] By adopting the above technical solution, the utility model has the following advantages:

[0029] The high-elasticity spring three of the utility model is arranged to play the role of squeezing the valve seat to fit tightly against the ball, further enhancing the sealing performance between the ball and the valve seat, and effectively preventing leakage of the medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0031] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model;

[0032] Figure 2 For this utility model Figure 1 The enlarged structural diagram at A in the middle;

[0033] Figure 3 For this utility model Figure 1 Enlarged structural diagram at B in the middle.

[0034] Figure numerals: 1. sphere; 101. flow port; 2. left valve body; 201. inflow channel; 3. right valve body; 301. outflow channel; 4. center plate; 401. support column; 5. fixing block; 501. embedded groove; 502. elastic groove; 6. sealing plate; 601. through groove; 602. inner groove; 7. annular plate; 701. inclined surface; 8. valve stem; 9. handle; 10. valve chamber; 11. moving block; 12. annular sleeve; 13. high elastic spring one; 14. moving plate; 15. buffer plate; 16. high elastic spring two; 17. side ring groove two; 18. side ring groove one; 19. high elastic spring three; 20. valve seat. DETAILED DESCRIPTION

[0035] like Figure 1As shown, in the specific embodiment, a backflow prevention ball valve includes a valve body and a valve stem 8, the valve body is fixedly connected by a left valve body 2 and a right valve body 3 by bolts, a valve cavity 10 is provided in the valve body, a ball 1 is provided in the valve cavity 10, the lower end of the valve stem 8 passes through the valve body and is fixedly connected to the upper end of the ball 1, and the upper end of the valve stem 8 is fixedly connected to a handle 9, valve seats 20 are fixedly provided at both ends of the ball 1 on the inner sides of the left valve body 2 and the right valve body 3, the valve seats 20 are abutted against the ball 1, a flow port 101 is provided in the center of the ball 1, and an inflow channel 201 and an outflow channel 301 are respectively provided at positions corresponding to the flow port 101 of the left valve body 2 and the right valve body 3, and the inflow channel 201 and the outflow channel 301 are provided. An anti-backflow device is provided in both the inflow channel 201 and the outflow channel 301, and the anti-backflow device includes a fixed portion, a fixed block 5 is fixedly provided on one side of the fixed portion, an embedded groove 501 is provided on the side of the fixed block 5 away from the fixed portion, an elastic groove 502 is provided in the embedded groove 501, a moving block 11 is provided in the embedded groove 501, an elastic portion is provided in the elastic groove 502, a sealing plate 6 is fixedly provided on the side of the moving block 11 away from the elastic portion, an annular plate 7 is fixedly provided at the position corresponding to the sealing plate 6 on the inner side of the inflow channel 201 and the outflow channel 301, the annular plate 7 is abutted against the sealing plate 6, and a buffer portion is provided on the side of the sealing plate 6 close to the annular plate 7.

[0036] Through the above arrangement, the inflow channel 201 and the outflow channel 301 of the utility model are both provided with an anti-backflow device, so that when the ball valve is closed, the backflow generated on both sides of the ball 1 can be eliminated, thereby effectively protecting the ball 1 and the pipeline; the arrangement of the sealing plate 6, the annular plate 7 and the elastic part of the utility model enables the medium to flow out of the annular plate 7 by squeezing the sealing plate 6 when the ball valve is opened, and when the ball valve is closed, the elastic part will make the sealing plate 6 return to its position and resist against the annular plate 7, which can effectively prevent the medium from flowing back and protect the pipeline and the ball 1; the arrangement of the buffer part of the utility model can effectively buffer the impact force generated on the sealing plate 6 when the medium flows, thereby protecting the sealing plate 6, thereby making the anti-backflow device not easily damaged.

[0037] like Figure 1 to Figure 2As shown, the annular plates 7 are all close to the side of the inflow channel 201, and the fixed parts are all close to the side of the outflow channel 301; the side of the annular plate 7 away from the sealing plate 6 is provided with an inclined surface 701; the fixed part includes a central plate 4, one side of the central plate 4 is fixedly connected to one side of the fixing block 5, and a plurality of support columns 401 are fixedly arranged around the central plate 4, and the ends of the support columns 401 away from the central plate 4 are respectively fixedly connected to the left valve body 2 and the right valve body 3; the side of the sealing plate 6 close to the annular plate 7 is provided with a through groove 601, and an inner groove 602 is provided in the through groove 601, and the buffer part includes a buffer plate 15 and a high elastic spring A buffer plate 15 is clamped in the inner groove 602, and a plurality of high-elastic springs 16 are fixedly arranged between the buffer plate 15 and the inner groove 602. The through groove 601 corresponds to the inner circle of the annular plate 7. An annular sleeve 12 is arranged on the side of the sealing plate 6 away from the annular plate 7. The annular sleeve 12 is in a bell-mouth shape, and the diameter of the side of the annular sleeve 12 close to the sealing plate 6 is larger than the diameter of the side away from the sealing plate 6. The elastic part includes a moving plate 14 and a high-elastic spring 13. One side of the moving plate 14 is fixedly connected to one side of the moving block 11, and a high-elastic spring 13 is fixedly arranged between the moving plate 14 and the elastic groove 502.

[0038] Through the above arrangement, the annular plates 7 of the utility model are all close to one side of the inflow channel 201, and the fixed parts are all close to one side of the outflow channel 301, so that the medium can be prevented from flowing back in both the inflow channel 201 and the outflow channel 301; the arrangement of the inclined surface 701 of the utility model makes the medium flow more smoothly; the arrangement of the central plate 4 and the support column 401 of the utility model plays the role of fixing the fixing block 5; the arrangement of the buffer plate 15 and the high elastic spring 16 of the utility model makes the medium flow when it impacts the buffer plate 15, and the high elastic spring 16 will consume a certain impact force to reduce the medium The impact of the medium on the buffer plate 15 plays a role in protecting the sealing plate 6; the setting of the annular sleeve 12 of the utility model allows the medium to flow more smoothly as the annular sleeve 12 tilts when the medium flows normally, and when the medium flows back, it will be trapped by the annular sleeve 12 to prevent the medium from flowing back; the setting of the high-elastic spring 13 and the movable plate 14 of the utility model allows the sealing plate 6 to be impacted and opened when the medium flows, so that the sealing plate 6 is squeezed toward the high-elastic spring 13, and when the medium stops flowing, the elastic force of the high-elastic spring 13 can make the sealing plate 6 return to its original position, thereby preventing the medium from flowing back.

[0039] like Figure 3 As shown, the left valve body 2 and the right valve body 3 are provided with a side ring groove 18 on one side of the valve seat 20, and the left valve body 2 and the right valve body 3 are provided with a side ring groove 2 17 on the outer ring side of the valve seat 20, and a plurality of high-elastic springs 3 19 are fixedly provided in the side ring groove 18 and the side ring groove 2 17.

[0040] Through the above arrangement, the high elastic spring 19 of the utility model plays a role in squeezing the valve seat 20 to fit tightly against the ball 1, further enhancing the sealing performance between the ball 1 and the valve seat 20, and effectively preventing leakage of the medium.

[0041] Working principle: When in use, when the handle 9 is turned to drive the valve stem 8 to rotate, so that the flow port 101 of the ball 1 is connected with the inflow channel 201 and the outflow channel 301, the medium flows in from the inflow channel 201, impacts the sealing plate 6, and pushes the sealing plate 6 to the side of the ball 1. At this time, the moving block 11 will squeeze the moving plate 14, so that the high elastic spring 13 is compressed. At this time, the medium can pass between the sealing plate 6 and the annular plate 7 and then enter the flow port 101, and then pass through the anti-backflow device in the outflow channel 301. When the medium impacts the sealing plate 6, it will impact the buffer plate 15 due to the high elastic spring. The setting of the second spring 16 can buffer a certain impact force, reduce the impact of the medium on the sealing plate 6, and effectively prevent the sealing plate 6 from being damaged. When the ball 1 is closed, the medium on both sides of the ball 1 will flow back. At this time, most of the refluxed medium will rush into the annular sleeve 12 and impact the side of the sealing plate 6 away from the annular plate 7, so that the sealing plate 6 returns to its original position. The elastic force of the high-elastic spring 13 will also cause the sealing plate 6 to return to its original position, thereby effectively preventing the medium from flowing back and protecting the ball 1 and the pipeline. The basic structure and installation method of the ball valve of the utility model are disclosed in the prior art, so this application will not go into too much detail.

[0042] The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims

1. A backflow prevention ball valve, comprising a valve body and a valve stem (8), wherein the valve body is fixedly connected by a left valve body (2) and a right valve body (3) by bolts, wherein a valve cavity (10) is provided in the valve body, wherein a ball (1) is provided in the valve cavity (10), wherein the lower end of the valve stem (8) passes through the valve body and is fixedly connected to the upper end of the ball (1), and the upper end of the valve stem (8) is fixedly connected to a handle (9), wherein: The inner sides of the left valve body (2) and the right valve body (3) are fixedly provided with valve seats (20) at both ends of the spherical body (1), the valve seats (20) are in contact with the spherical body (1), a flow opening (101) is provided at the center of the spherical body (1), the left valve body (2) and the right valve body (3) are respectively provided with an inflow channel (201) and an outflow channel (301) at positions corresponding to the flow opening (101), and a backflow prevention device is provided in the inflow channel (201) and the outflow channel (301), and the backflow prevention device comprises a fixing portion, a fixing block (5) is fixedly provided on one side of the fixing portion, and the fixing block (5) An embedded groove (501) is provided on a side away from the fixed portion, an elastic groove (502) is provided in the embedded groove (501), a moving block (11) is provided in the embedded groove (501), an elastic portion is provided in the elastic groove (502), a sealing plate (6) is fixedly provided on the side of the moving block (11) away from the elastic portion, an annular plate (7) is fixedly provided at a position corresponding to the sealing plate (6) on the inner side of the inflow channel (201) and the outflow channel (301), the annular plate (7) abuts against the sealing plate (6), and a buffer portion is provided on the side of the sealing plate (6) close to the annular plate (7).

2. The backflow prevention ball valve according to claim 1, characterized in that: The annular plates (7) are all close to one side of the inflow channel (201), and the fixing portions are all close to one side of the outflow channel (301).

3. The anti-backflow ball valve according to claim 2, characterized in that: A side of the annular plate (7) away from the sealing plate (6) is provided with an inclined surface (701).

4. The anti-backflow ball valve according to claim 3, characterized in that: The fixing portion comprises a center plate (4), one side of the center plate (4) is fixedly connected to one side of the fixing block (5), a plurality of support columns (401) are fixedly provided around the center plate (4), and one end of the support column (401) away from the center plate (4) is fixedly connected to the left valve body (2) and the right valve body (3), respectively.

5. The backflow prevention ball valve according to claim 4, characterized in that: A through groove (601) is provided on one side of the sealing plate (6) close to the annular plate (7); an inner groove (602) is provided in the through groove (601); the buffer portion comprises a buffer plate (15) and a second high-elastic spring (16); the buffer plate (15) is clamped in the inner groove (602); a plurality of the second high-elastic springs (16) are fixedly provided between the buffer plate (15) and the inner groove (602); and the through groove (601) corresponds to the inner ring of the annular plate (7).

6. The backflow prevention ball valve according to claim 5, characterized in that: An annular sleeve (12) is provided on the side of the sealing plate (6) away from the annular plate (7); the annular sleeve (12) is in a bell-mouth shape; the diameter of the side of the annular sleeve (12) close to the sealing plate (6) is larger than the diameter of the side away from the sealing plate (6).

7. The backflow prevention ball valve according to claim 6, characterized in that: The elastic part comprises a movable plate (14) and a high-elastic spring (13); one side of the movable plate (14) is fixedly connected to one side of the movable block (11); and the high-elastic spring (13) is fixedly arranged between the movable plate (14) and the elastic groove (502).

8. The backflow prevention ball valve according to claim 1, characterized in that: The left valve body (2) and the right valve body (3) are provided with a side ring groove one (18) on one side of the valve seat (20), and the left valve body (2) and the right valve body (3) are provided with a side ring groove two (17) on one side of the outer ring of the valve seat (20), and a plurality of high-elasticity springs three (19) are fixedly provided in the side ring groove one (18) and the side ring groove two (17).

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