Butterfly valve reliable in sealing

Abstract

The utility model discloses a reliably sealed butterfly valve which comprises a valve body, a valve shaft and a butterfly plate, the butterfly plate is arranged in the valve body, and the valve shaft penetrates through the valve body and is in linkage connection with the butterfly plate. The butterfly plate comprises a butterfly plate body, a pressing ring and a sealing ring, an annular groove is formed in the portion, close to the outer edge, of the end, away from the valve shaft, of the butterfly plate body, the pressing ring is embedded in the annular groove, a plurality of positioning columns are evenly arranged on the inner circle face of the pressing ring in the circumferential direction, and a plurality of positioning grooves with the same number as the positioning columns are formed in the inner circle face, corresponding to the annular groove, of the butterfly plate body. The positioning groove comprises an arc-shaped locking section arranged on the inner circle face of the annular groove and an inlet and outlet extending from the end face of the butterfly plate body to one end of the arc-shaped locking section, the positioning columns are screwed into the inner ends of the corresponding arc-shaped locking sections through the corresponding inlet and outlet, and the sealing ring is clamped between the pressing ring and the butterfly plate body. The structure is more stable and reliable, it can be guaranteed that all parts of the sealing ring are evenly stressed in the installation and using process, the service life of the sealing ring is prolonged, and reliable sealing performance of the valve is guaranteed.

Description

Technical Field

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

[0002] A butterfly valve is a valve that uses a disc-type opening and closing member to reciprocate about 90 degrees to open, close or adjust the flow of the medium. The butterfly valve is not only simple in structure, small in size, light in weight, low in material consumption, small in installation size, small in driving torque, easy and quick to operate, but also has good flow regulation function and closing and sealing characteristics at the same time. It is one of the fastest growing valve varieties in the past decade. The use of butterfly valves is very extensive. The variety and quantity of its use are still expanding, and it is developing towards high temperature, high pressure, large diameter, high sealing, long life, excellent adjustment characteristics, and one valve with multiple functions. Its reliability and other performance indicators have reached a high level.

[0003] The butterfly valve in the prior art includes a valve body, a butterfly plate and a valve shaft. The butterfly plate is installed on the valve shaft in linkage. The circular butterfly plate is arranged in the valve body and can rotate in the valve body through the support of the valve shaft. The valve body has a valve seat for forming a seal with the butterfly plate when the valve is closed. Among them, the structure of the butterfly plate usually includes a butterfly plate body, a pressure ring and a sealing ring. The pressure ring is connected to the butterfly plate body through a plurality of screws. The sealing ring is clamped between the pressure ring and the butterfly plate body and is used to seal with the valve seat sealing surface when the valve is closed. However, in the past use process, the structure has the following disadvantages: due to the manual tightening of multiple screws, the number of rotations of each screw has a deviation, resulting in different forces at each force point of the pressure ring, resulting in uneven force on the sealing ring. After the valve is opened and closed many times, the sealing ring is easily deformed and damaged, resulting in sealing failure. In addition, during the use of the valve, the screws are also likely to loosen due to the impact and vibration of the medium, resulting in changes in the local preload force, which will also cause the above problems. Therefore, it is necessary to develop a butterfly valve with a more stable structure and more reliable sealing to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a butterfly valve with reliable sealing. The structure of the utility model is more stable and reliable, and can ensure that the various parts of the sealing ring are evenly stressed during installation and use, thereby increasing its service life and ensuring the reliable sealing of the valve.

[0005] To achieve the above object, the present utility model provides the following technical solution: A butterfly valve with reliable sealing, comprising a valve body, a valve shaft and a butterfly plate. The butterfly plate is arranged inside the valve body. The valve shaft penetrates through the valve body and is linked with the butterfly plate to drive the butterfly plate to rotate. A valve seat is arranged inside the valve body for forming a sealing fit with the butterfly plate when the valve is closed. The butterfly plate includes a butterfly plate main body, a retaining ring and a sealing ring. A circular groove is provided at a position near the outer edge of the end of the butterfly plate main body away from the valve shaft. The retaining ring is embedded in the circular groove, and the inner circular surface of the retaining ring is closely attached to the inner circular surface of the circular groove. A plurality of positioning posts are evenly arranged along the circumferential direction on the inner circular surface of the retaining ring. A plurality of positioning grooves corresponding to the number of the positioning posts are provided on the inner circular surface of the butterfly plate main body corresponding to the circular groove. The positioning groove includes an arc-shaped locking section provided on the inner circular surface of the circular groove and an inlet / outlet extending from the end face of the butterfly plate main body to one end of the arc-shaped locking section. The positioning post is screwed into the inner end of the corresponding arc-shaped locking section through the corresponding inlet / outlet, and the sealing ring is clamped between the retaining ring and the butterfly plate main body.

[0006] By adopting the above technical solution, the retaining ring is matched with the circular groove of the backing plate main body. During installation, the positioning posts on the retaining ring pass through the inlet / outlets of the corresponding positioning grooves, and then the retaining ring is rotated to screw the positioning posts into the inner ends of the arc-shaped locking sections of the positioning grooves, realizing the rapid installation of the retaining ring, and clamping the sealing ring between the retaining ring and the butterfly plate main body. Since the positioning posts are arranged in a circumferential array and are on the same plane, it can ensure that each part of the sealing ring is evenly stressed, and there is no situation where the sealing ring is unevenly stressed due to loose screws or different numbers of tightened turns. Its structure is more reliable and can ensure the reliable sealing performance of the valve.

[0007] The present utility model is further arranged such that the positioning post and the corresponding arc-shaped locking section are in interference fit.

[0008] By adopting the above technical solution, the friction force between the positioning post and the arc-shaped locking section can be increased, and the positioning post can be prevented from loosening out of the arc-shaped locking section.

[0009] The present utility model is further arranged such that arc-shaped damping protrusions for restricting the positioning post at the inner end of the arc-shaped locking section are provided on the inner wall of the arc-shaped locking section.

[0010] By adopting the above technical solution, the arc-shaped damping protrusions act on the positioning post, which can further improve the stability of the installation structure of the retaining ring.

[0011] The present utility model is further configured to further include at least one anti-loosening screw. A smooth shaft section is provided at the end of the screw rod of the anti-loosening screw. The pressure ring is provided with screw holes equal in number to the anti-loosening screws. A locking groove corresponding to the screw holes is provided on the end face of the butterfly plate body corresponding to the annular groove. The inner diameter of the locking groove is equal to the outer diameter of the smooth shaft section. The screw rod part of the anti-loosening screw is threadedly connected to the corresponding screw hole, and the smooth shaft section of the anti-loosening screw is inserted into the corresponding locking groove.

[0012] By adopting the above technical solution, when the smooth shaft section of the anti-loosening screw is inserted into the locking groove of the butterfly plate body, it can play a role in circumferentially locking the pressure ring, achieving a reliable anti-loosening effect on the pressure ring.

[0013] The present utility model is further configured to that the anti-loosening screw is an internal hexagonal screw, and a relief groove for the screw head of the anti-loosening screw to be embedded is provided at a position corresponding to the outer end of the screw hole.

[0014] By adopting the above technical solution, the design of the relief groove not only makes the surface of the pressure ring more concise and beautiful, but also can prevent the screw head from protruding from the surface of the pressure ring and scratching the skin of the operator during disassembly.

[0015] The present utility model is further configured to that a plurality of thread grooves equal in number to the positioning posts are provided on the inner wall of the pressure ring. Threaded parts are provided on the positioning posts, and the threaded parts are threadedly connected to the corresponding thread grooves.

[0016] By adopting the above technical solution, the detachable design of the positioning posts is not only convenient for disassembly and assembly, but also more conducive to processing compared with an integral structure, and the processing cost is lower.

[0017] The present utility model is further configured to that a round top is provided at the outer end of the positioning post.

[0018] By adopting the above technical solution, the round top design of the positioning post enables it to slide more smoothly within the arc-shaped locking section.

[0019] The present utility model is further configured to that a cross-shaped groove is provided on the round top of the positioning post.

[0020] By adopting the above technical solution, a cross-shaped screwdriver can be inserted into the cross-shaped groove to rotate the positioning post, realizing the disassembly and assembly of the positioning post, making the disassembly and assembly operations easier and more convenient.

[0021] The present utility model is further configured to that an annular sealing groove is further provided on the inner end face of the butterfly plate body corresponding to the annular groove. A C-ring for sealing cooperation with a sealing ring is embedded in the annular sealing groove.

[0022] By adopting the above technical solution, setting the C-ring can further improve the sealing performance between the sealing ring and the butterfly plate body, and prevent the upstream medium from leaking to the downstream through the gap between the two when the valve is closed.

[0023] The sealing ring is a solid metal sealing ring or a graphite sandwich ring.

[0024] By adopting the above technical solution, when the sealing ring is a solid metal sealing ring, it has the advantages of small contact surface, small friction force, and small valve opening torque, which can ensure the long-term safe operation and long service life of the valve; when the sealing ring is a graphite sandwich ring, it has the advantages of high reliability and high economy. Brief Description of the Drawings

[0025] Figure 1 is a schematic structural diagram of the whole of the present utility model;

[0026] Figure 2 is Figure 1 an enlarged schematic structural diagram of part A in

[0027] Figure 3 is a schematic structural diagram of the butterfly plate body of the present utility model.

[0028] In the figure: 1, valve body; 2, valve shaft; 3, butterfly plate; 4, valve seat; 5, butterfly plate body; 6, retaining ring; 7, sealing ring; 8, annular groove; 9, positioning post; 10, positioning groove; 11, arc locking section; 12, inlet and outlet; 13, arc damping projection; 14, lock screw; 15, optical axis section; 16, screw hole; 17, locking groove; 18, relief groove; 19, thread groove; 20, thread portion; 21, dome; 22, cross-shaped groove; 23, annular sealing groove; 24, C-ring. Detailed Embodiment

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0030] Embodiment: As shown in the attached Figures 1 to 3A butterfly valve with reliable sealing is shown, which includes a valve body 1, a valve shaft 2 and a butterfly plate 3. The butterfly plate 3 is arranged inside the valve body 1. The valve shaft 2 penetrates through the valve body 1 and is connected to the butterfly plate 3 in a linkage manner for driving the butterfly plate 3 to rotate. The two can be connected by a plug pin. A valve seat 4 is arranged inside the valve body 1 for forming a sealing fit with the butterfly plate 3 when the valve is closed. The butterfly plate 3 includes a butterfly plate main body 5, a retaining ring 6 and a sealing ring 7. A circular groove 8 is arranged at a position near the outer edge at one end of the butterfly plate main body 5 away from the valve shaft 2. The retaining ring 6 is embedded in the circular groove 8, and the inner circular surface of the retaining ring 6 is closely attached to the inner circular surface of the circular groove 8. A plurality of positioning posts 9 are evenly arranged along the circumferential direction on the inner circular surface of the retaining ring 6. A plurality of positioning grooves 10 with the same number as the positioning posts 9 are arranged on the inner circular surface of the butterfly plate main body 5 corresponding to the circular groove 8. In this embodiment, the number of the positioning posts 9 and the positioning grooves 10 is four. The positioning groove 10 includes an arc-shaped locking section 11 arranged on the inner circular surface of the circular groove 8 and an inlet / outlet 12 extending from the end face of the butterfly plate main body 5 to one end of the arc-shaped locking section 11. The outer end of the inlet / outlet 12 has a flared opening. The positioning post 9 is screwed into the inner end of the corresponding arc-shaped locking section 11 through the corresponding inlet / outlet 12. The sealing ring 7 is clamped between the retaining ring 6 and the butterfly plate main body 5. The retaining ring 6 is matched with the circular groove 8 of the backing plate main body. When installing, the positioning posts 9 on the retaining ring 6 are passed through the inlet / outlets 12 of the corresponding positioning grooves 10, and then the retaining ring 6 is rotated to screw the positioning posts 9 into the inner ends of the arc-shaped locking sections 11 of the positioning grooves 10, realizing the rapid installation of the retaining ring 6 and clamping the sealing ring 7 between the retaining ring 6 and the butterfly plate main body 5. Since the positioning posts 9 are distributed in a circumferential array and the plurality of positioning posts 9 are on the same plane, it can ensure that each part of the sealing ring 7 is uniformly stressed, and there is no situation where the sealing ring 7 is unevenly stressed due to loose screws or different numbers of tightened turns. Its structure is more reliable and can ensure the reliable sealing of the valve.

[0031] Wherein, the positioning post 9 and the corresponding arc-shaped locking section 11 are in interference fit. This design can improve the friction force between the positioning post 9 and the arc-shaped locking section 11 and prevent the positioning post 9 from loosening out of the arc-shaped locking section 11.

[0032] As shown in the appendix Figure 3 As shown, arc-shaped damping protrusions 13 for restricting the positioning post 9 at the inner end of the arc-shaped locking section 11 are arranged on the inner wall of the arc-shaped locking section 11. The arc-shaped damping protrusions 13 can be an integral structure with the butterfly plate main body 5 or can be made of silica gel material and then pasted on the arc-shaped locking section 11 through glue. The arrangement of the arc-shaped damping protrusions 13 acting on the positioning post 9 can further improve the stability of the installation structure of the retaining ring 6.

[0033] As shown in the appendix Figure 2As shown, it further includes at least one lock - loosening prevention screw 14. A smooth shaft section 15 is provided at the end of the screw rod of the lock - loosening prevention screw 14. The pressure ring 6 is provided with screw holes 16 equal in number to the lock - loosening prevention screws 14. On the end face of the butterfly plate body 5 corresponding to the annular groove 8, a locking groove 17 corresponding to the screw hole 16 is provided. The inner diameter of the locking groove 17 is equal to the outer diameter of the smooth shaft section 15. The screw rod part of the lock - loosening prevention screw 14 is threadedly connected to the corresponding screw hole 16, and the smooth shaft section 15 of the lock - loosening prevention screw 14 is inserted into the corresponding locking groove 17. When the smooth shaft section 15 of the lock - loosening prevention screw 14 is inserted into the locking groove 17 of the butterfly plate body 5, it can play a role in circumferentially locking the pressure ring 6, achieving a reliable lock - loosening prevention effect on the pressure ring 6.

[0034] As shown in the Figure 2 attachment, the lock - loosening prevention screw 14 is an internal hexagonal screw, and a relief groove 18 for the screw head of the lock - loosening prevention screw 14 to be embedded is provided at the position corresponding to the outer end of the screw hole 16. The design of the relief groove 18 not only makes the surface of the pressure ring 6 more concise and beautiful, but also can prevent the screw head from protruding from the surface of the pressure ring 6 and scratching the skin of the operator during disassembly.

[0035] As shown in the Figure 2 attachment, a plurality of thread grooves 19 equal in number to the positioning posts 9 are provided on the inner wall of the pressure ring 6. The positioning posts 9 are provided with threaded parts 20, and the threaded parts 20 are threadedly connected to the corresponding thread grooves 19. In addition, the two can also be installed by interference fit. The detachable design of the positioning posts 9 is not only convenient for disassembly and assembly, but also more conducive to processing compared with the integral structure, and the processing cost is lower.

[0036] As shown in the Figure 2 attachment, a round top 21 is provided at the outer end of the positioning post 9. The design of the round top 21 of the positioning post 9 enables it to slide more smoothly within the arc - shaped locking section 11.

[0037] As shown in the Figure 2 attachment, a cross - shaped groove 22 is provided on the round top 21 of the positioning post 9. The cross - shaped groove 22 can also be replaced by a straight - shaped groove or an internal hexagonal groove. A cross - shaped screwdriver can be inserted into the cross - shaped groove 22 to rotate the positioning post 9, realizing the disassembly and assembly of the positioning post 9, making the disassembly and assembly operations easier and more convenient.

[0038] As shown in the Figure 2 attachment, an annular sealing groove 23 is further provided on the inner end face of the butterfly plate body 5 corresponding to the annular groove 8. A C - ring 24 for sealing cooperation with the sealing ring 7 is embedded in the annular sealing groove 23. The setting of the C - ring 24 can further improve the sealing performance between the sealing ring 7 and the butterfly plate body 5, preventing the upstream medium from leaking to the downstream through the gap between the two when the valve is closed.

[0039] In addition, the sealing ring 7 is a solid metal sealing ring or a graphite sandwich ring. When the sealing ring 7 is a solid metal sealing ring (specifically, an OHL-KX-SAFEFLEX type solid metal sealing ring), it has the advantages of small contact surface, small friction force, and small valve opening torque, which can ensure the long-term safe operation of the valve and a long service life; when the sealing ring 7 is a graphite sandwich ring, it has the advantages of high reliability and high economy, and can be widely used in special media, ultra-high (ultra-low) temperature, high pressure, and high-sealing requirements for switches and process flow control.

Claims

1. A butterfly valve with reliable sealing, comprising a valve body (1), a valve shaft (2) and a butterfly plate (3), the butterfly plate (3) is arranged in the valve body (1), the valve shaft (2) penetrates through the valve body (1) and is linked with the butterfly plate (3) for driving the butterfly plate (3) to rotate, and a valve seat (4) for forming a sealing fit with the butterfly plate (3) when the valve is closed is arranged in the valve body (1); characterized in that: The butterfly plate (3) includes a butterfly plate body (5), a retaining ring (6), and a sealing ring (7). A circular groove (8) is provided at a position near the outer edge of one end of the butterfly plate body (5) away from the valve shaft (2). The retaining ring (6) is embedded in the circular groove (8), and the inner circular surface of the retaining ring (6) is in close contact with the inner circular surface of the circular groove (8). A plurality of positioning posts (9) are uniformly arranged along the circumferential direction on the inner circular surface of the retaining ring (6). A plurality of positioning grooves (10) with a number equivalent to that of the positioning posts (9) are provided on the inner circular surface of the butterfly plate body (5) corresponding to the circular groove (8). The positioning groove (10) includes an arc-shaped locking section (11) provided on the inner circular surface of the circular groove (8) and an inlet / outlet (12) extending from the end face of the butterfly plate body (5) to one end of the arc-shaped locking section (11). The positioning post (9) is screwed into the inner end of the corresponding arc-shaped locking section (11) through the corresponding inlet / outlet (12). The sealing ring (7) is clamped between the retaining ring (6) and the butterfly plate body (5).

2. A butterfly valve with reliable sealing according to claim 1, characterized in that: The positioning post (9) is in interference fit with the corresponding arc-shaped locking section (11).

3. A butterfly valve with reliable sealing according to claim 1, characterized in that: Arc-shaped damping protrusions (13) for restricting the positioning post (9) at the inner end of the arc-shaped locking section (11) are provided on the inner wall of the arc-shaped locking section (11).

4. A butterfly valve with reliable sealing according to claim 1, characterized in that: It further includes at least one anti-loosening screw (14). A smooth shaft section (15) is provided at the end of the screw rod of the anti-loosening screw (14). A plurality of screw holes (16) with a number equivalent to that of the anti-loosening screws (14) are provided on the retaining ring (6). A locking groove (17) corresponding to the screw hole (16) is provided on the end face of the butterfly plate body (5) corresponding to the circular groove (8). The inner diameter of the locking groove (17) is equivalent to the outer diameter of the smooth shaft section (15). The screw rod part of the anti-loosening screw (14) is threadedly connected to the corresponding screw hole (16), and the smooth shaft section (15) of the anti-loosening screw (14) is inserted into the corresponding locking groove (17).

5. A butterfly valve with reliable sealing according to claim 4, characterized in that: The anti-loosening screw (14) is an internal hexagonal screw, and a relief groove (18) for embedding the screw head of the anti-loosening screw (14) is provided at a position corresponding to the outer end of the screw hole (16).

6. A butterfly valve with reliable sealing according to claim 1, characterized in that: A plurality of threaded grooves (19) with a number equivalent to that of the positioning posts (9) are provided on the inner wall of the retaining ring (6). A threaded part (20) is provided on the positioning post (9). The threaded part (20) is threadedly connected to the corresponding threaded groove (19).

7. A butterfly valve with reliable sealing according to claim 6, characterized in that: A round top (21) is provided at the outer end of the positioning post (9).

8. A butterfly valve with reliable sealing according to claim 7, characterized in that: A cross-shaped groove (22) is provided on the round top (21) of the positioning post (9).

9. A butterfly valve with reliable sealing according to claim 1, characterized in that: An annular sealing groove (23) is further provided on the inner end face of the butterfly plate body (5) corresponding to the circular groove (8). A C-ring (24) for forming a sealing fit with the sealing ring (7) is embedded in the annular sealing groove (23).

10. A butterfly valve with reliable sealing according to claim 1, characterized in that: The sealing ring (7) is a solid metal sealing ring or a graphite sandwich ring.

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