A double-sealed ceramic gate valve and installation method

Abstract

The present invention discloses a double-sealed ceramic gate valve, which includes a valve seat and a valve stem. A channel is provided in the valve seat, and a protruding portion is provided in the middle thereof. A mounting seat is slidably provided in the protruding portion. A sealing cover is provided on the valve seat, a connecting portion is provided on the sealing cover, and an operating member for driving the valve stem to drive the mounting seat to move is provided on the connecting portion. Two sealing members for blocking the channel are slidably provided on the mounting seat. A receiving cavity is provided in the middle of the mounting seat, and a cover plate for closing the receiving cavity is provided on the mounting seat. A transmission member for driving the two sealing members to move in opposite directions along the center line direction of the channel is provided in the receiving cavity. By providing two movable sealing members, in the process of opening and closing the channel, only the transmission rod needs to be rotated. The relative wear between the sealing member and the wear-resistant member is small, and the sealing performance is good. Compared with the traditional gate valve, its service life is longer.

Description

Technical Field

[0001] The present invention discloses a double-sealed ceramic gate valve and an installation method, belonging to the technical field of valves. Background Art

[0002] A gate valve usually controls the full opening and full closing of the valve by moving the gate plate in a direction perpendicular to the fluid flow direction, and is widely used in fields such as water conservancy and oil and gas pipelines to conveniently and flexibly control the opening and closing of the connected pipelines. The existing gate valves usually drive the screw rod transmission through a handwheel outside the valve body to lift or lower the gate plate, thereby playing a role in opening or closing the pipeline.

[0003] The existing gate valve relies on the plane contact between the valve plate and the sealing ring to close the passage. During the process of lowering or lifting the gate plate, whether the mating surface between the valve stem and the sealing ring is a plane or an inclined plane, in order to ensure the sealing effect between the two, there is bound to be significant wear, resulting in the need to replace the parts after a certain period of use, and the sealing performance is also greatly reduced. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the prior art and provide a double-sealed ceramic gate valve and an installation method.

[0005] The present invention realizes the above purpose through the following technical solutions. A double-sealed ceramic gate valve and an installation method include a valve seat and a valve stem. A passage is provided in the valve seat, and a protruding portion is provided in the middle thereof. An installation seat is slidably provided in the protruding portion. A sealing cover is provided on the valve seat. A connecting portion is provided on the sealing cover. A manipulating member for driving the valve stem to drive the installation seat to move is provided on the connecting portion. Two sealing members for blocking the passage are slidably provided on the installation seat. A receiving cavity is provided in the middle of the installation seat, and a cover plate for closing the receiving cavity is provided on the installation seat. A transmission member for driving the two sealing members to move in opposite directions along the center line direction of the passage is provided in the receiving cavity. The transmission member includes a driving gear and two driven gears. A driving shaft is connected to the middle of the driving gear. One end of the valve stem passing through the sealing cover is connected to the cover plate by a bolt. The end of the driving shaft away from the driving gear extends to the inside of the valve stem. A transmission rod for driving the driving shaft to rotate is provided inside the valve stem. A driven shaft is connected to the middle of the driven gear. The end of the driven shaft away from the driven gear is threadedly connected to the sealing member.

[0006] Preferably, three insertion rods are arranged in an array on the sealing member. Ring protrusions are provided on both sides of the installation seat. A protruding column matching the insertion rod is provided between the two ring protrusions.

[0007] Preferably, the sealing member is used to seal a convex portion with a spherical structure on one side of the channel. A wear-resistant member that cooperates with the sealing member is embedded in the valve seat, and a rubber sealing ring that cooperates with the wear-resistant member is provided on the sealing member.

[0008] Preferably, one side of the sealing member close to the annular protrusion has an embedding portion, and a pressure-bearing platform is provided in the middle of the driven shaft.

[0009] Preferably, two convex ribs for positioning the mounting seat are provided on the inner wall of the protruding portion, and a plurality of diversion grooves are provided on the convex ribs.

[0010] Preferably, the operating member includes a rotating member, a fixing member, and a handwheel. The rotating member is threadedly connected to the valve stem, the fixing member is threadedly connected to the connecting portion, and the fixing member is rotatably connected to the rotating member. The handwheel is installed on the outside of the rotating member.

[0011] Preferably, a first hexagonal limiting portion is provided on the driving shaft, a slot that cooperates with the first hexagonal limiting portion is provided on the transmission rod, and a second hexagonal limiting portion is provided at one end of the transmission rod exposed outside the valve stem.

[0012] Preferably, one end of the transmission rod connected to the driving shaft has a convex platform, a spring is provided on the outside of the convex platform, a limiting block is detachably connected to the end of the transmission rod away from the convex platform, and a nut is provided on the outside of the valve stem.

[0013] An installation method of a double-sealing ceramic gate valve includes the following steps:

[0014] S1: First, install the sealing member at one end of the driven shaft, and then install the two of them from one side of the mounting seat, so that the embedding portion is located inside the mounting seat, the insertion rod is located inside the convex column, the other end of the driven shaft is located in the accommodating cavity. Subsequently, install two driven gears on the driven shaft, install the driving gear at one end of the driving shaft passing through the cover plate, then connect the cover plate and the mounting seat with bolts, and make the first hexagonal limiting portion exposed outside.

[0015] S2: Pass the valve stem through the connecting portion, then screw the rotating member onto the outside of the valve stem. Subsequently, put the fixing member on the outside of the rotating member and threadedly connect it to the connecting portion. Then install the handwheel on the outside of the rotating member, put the spring on the outside of the convex platform, and make the transmission rod pass through the valve stem from one end. Subsequently, install nuts and limiting blocks on the outside of the valve stem and the transmission rod respectively.

[0016] S3: Connect the valve stem and the cover plate with bolts, then assemble the wear-resistant member in the valve seat. Subsequently, install the mounting seat and the sealing member from top to bottom inside the protruding portion, and finally connect the sealing cover and the valve seat with bolts.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. By setting the transmission member, the sealing member and the transmission rod, when it is necessary to close or open the channel, only the transmission rod needs to be rotated, so that the two sealing members are driven by the driving gear to move away from or close to each other, and the valve stem drives the mounting seat to move. Since the sealing member and the wear-resistant member are sealed by keeping in contact, the relative friction during the sealing of the traditional gate valve is reduced, the wear of the parts is effectively reduced, and its service life is prolonged.

[0019] 2. The sealing member has a protrusion that cooperates with the wear-resistant member. It can not only increase the strength of the sealing member, but also reduce the force generated by the fluid on the sealing member. And the pressure-bearing platform on the driven shaft can transmit the pressure to the mounting seat, which not only ensures that the sealing member has good sealing performance, but also avoids the large impact force on the driven gear and the driving gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of a double-sealing ceramic gate valve of the present invention;

[0021] Figure 2 It is a sectional view of a double-sealing ceramic gate valve of the present invention;

[0022] Figure 3 It is an exploded view of the parts inside the protruding part of the present invention;

[0023] Figure 4 It is a schematic structural diagram of the transmission member of the present invention;

[0024] Figure 5 It is a schematic structural diagram of the mounting seat of the present invention;

[0025] Figure 6 It is a schematic structural diagram of the valve seat of the present invention;

[0026] Reference numerals: 1. Channel; 2. Sealing cover; 3. Operating member; 4. Nut; 5. Limiting block; 6. Valve stem; 7. Connecting part; 8. Valve seat; 9. Protruding part; 10. Convex rib; 11. Handwheel; 12. Transmission rod; 13. Rotating member; 14. Transmission member; 15. Mounting seat; 16. Sealing member; 17. Wear-resistant member; 18. Second hexagonal limiting part; 19. Spring; 20. Plug rod; 21. Convex column; 22. Protrusion; 23. Cover plate; 24. Convex platform; 25. Fixing member; 26. Driving shaft; 27. First hexagonal limiting part; 28. Driving gear; 29. Driven shaft; 30. Driven gear; 31. Pressure-bearing platform; 32. Ring convex; 33. Accommodating cavity; 34. Flow guiding groove; 35. Embedding part. DETAILED DESCRIPTION OF THE INVENTION

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] As Figures 1-6 shown, a double-sealed ceramic gate valve includes a valve seat 8 and a valve stem 6. A channel 1 is provided in the valve seat 8, and a convex portion 9 is provided in the middle thereof. A mounting seat 15 is slidably provided in the convex portion 9. A sealing cover 2 is provided on the valve seat 8. A connecting portion 7 is provided on the sealing cover 2. A control member 3 for driving the valve stem 6 to drive the mounting seat 15 to move is provided on the connecting portion 7. Two sealing members 16 for blocking the channel 1 are slidably provided on the mounting seat 15. A receiving cavity 33 is provided in the middle of the mounting seat 15, and a cover plate 23 for closing the receiving cavity 33 is provided on the mounting seat 15. A transmission member 14 for driving the two sealing members 16 to move in opposite directions along the center line direction of the channel 1 is provided in the receiving cavity 33. The transmission member 14 includes a driving gear 28 and two driven gears 30. A driving shaft 26 is connected to the middle of the driving gear 28. One end of the valve stem 6 passing through the sealing cover 2 is connected to the cover plate 23 by a bolt. One end of the driving shaft 26 away from the driving gear 28 extends to the inside of the valve stem 6. A transmission rod 12 for driving the driving shaft 26 to rotate is provided inside the valve stem 6. A driven shaft 29 is connected to the middle of the driven gear 30. One end of the driven gear 30 away from the driven shaft 29 is threadedly connected to the sealing member 16.

[0029] Three insertion rods 20 are arranged in an array on the sealing member 16. Ring protrusions 32 are provided on both sides of the mounting seat 15. A convex column 21 matching with the insertion rod 20 is provided between the two ring protrusions 32. One side of the sealing member 16 for blocking the channel 1 has a spherical structure protrusion 22. A wear-resistant member 17 matching with the sealing member 16 is inlaid in the valve seat 8. A rubber sealing ring matching with the wear-resistant member 17 is provided on the sealing member 16. An embedding portion 35 is provided on one side of the sealing member 16 close to the ring protrusion 32. A pressure-bearing platform 31 is provided in the middle of the driven shaft 29. Two convex ribs 10 for positioning the mounting seat 15 are provided on the inner wall of the convex portion 9, and a plurality of flow guiding grooves 34 are provided on the convex ribs 10.

[0030] The operating member 3 includes a rotating member 13, a fixing member 25 and a handwheel 11. The rotating member 13 is threadedly connected to the valve stem 6, the fixing member 25 is threadedly connected to the connecting portion 7, and the fixing member 25 is rotatably connected to the rotating member 13. The handwheel 11 is installed outside the rotating member 13. A first hexagonal limiting portion 27 is provided on the driving shaft 26, and a slot cooperating with the first hexagonal limiting portion 27 is provided on the transmission rod 12. One end of the transmission rod 12 exposed outside the valve stem 6 has a second hexagonal limiting portion 18. One end of the transmission rod 12 connected to the driving shaft 26 has a boss 24. A spring 19 is provided outside the boss 24. A limiting block 5 is detachably connected to one end of the transmission rod 12 away from the boss 24. A nut 4 is provided outside the valve stem 6.

[0031] Working principle: When the channel 1 in the valve seat 8 is switched from the open state to the closed state, first rotate the handwheel 11 so that the rotating member 13 drives the valve stem 6 to descend, and the mounting seat 15 also descends synchronously and reaches the bottom of the protruding portion 9. Then, engage one end of the transmission rod 12 with the driving shaft 26 and rotate the transmission rod 12 to make the driving gear 28 drive the two driven gears 30 to rotate synchronously. Then, drive the sealing member 16 to rotate by using the driven shaft 29. Since the insertion rod 20 on the sealing member 16 cooperates with the convex column 21, the sealing member 16 cannot rotate, and the driven shaft 29 is threadedly connected to the sealing member 16. In this way, the sealing member 16 can only slide along the center line of the channel 1, and finally the two sealing members 16 abut against the wear-resistant member 17, thereby closing the channel 1. Since the side surface of the sealing member 16 has a convexity 22 with a spherical structure and its middle part is thick, the pressure of the fluid acts on the surface of the convexity 22, so that the strength of the sealing member 16 can meet the use requirements and no bending deformation will occur. And the sealing performance of the convexity 22 abutting against the wear-resistant member 17 is better than that of the traditional planar abutment. The pressure received by the sealing member 16 is transmitted from the pressure-bearing platform 31 to the mounting seat 15 and the valve seat 8, which can reduce the impact force of the driven gear 30 on the driving gear 28. At the same time, the embedding portion 35 cooperates with the mounting seat 15 for sealing, so that the fluid will not enter the inside of the mounting seat 15 and affect the rotation of the driven shaft 29. In addition, a diversion groove 34 is provided on the convex rib 10, which can prevent impurities from accumulating at the bottom of the protruding portion 9 and reduce the influence on the mounting seat 15.

[0032] After closing channel 1, by turning nut 4, it pushes the limit block 5 upward, and thereby causes the boss 24 to compress spring 19, so that the first hexagonal limit portion 27 disengages from the slot. In this way, when the first hexagonal limit portion 27 is rotated, the driving shaft 26 cannot rotate, and thus channel 1 cannot be opened, thereby avoiding the situation where workers accidentally operate the transmission rod 12, achieving the effect of safety protection. When it is necessary to open channel 1, rotate nut 4 in the reverse direction so that the first hexagonal limit portion 27 is re-fitted with the slot. Subsequently, first rotate the transmission rod 12 to make the two seals 16 approach each other to disengage from the contact with the wear-resistant member 17 until the transmission rod 12 cannot rotate. Finally, rotate the handwheel 11 in the reverse direction so that the valve stem 6 drives the mounting seat 15 to abut against the sealing cover 2.

[0033] As Figures 1-6 shown, a method for installing a double-sealed ceramic gate valve includes the following steps:

[0034] S1: First, install the seal 16 at one end of the driven shaft 29, and then insert the two into the mounting seat 15 from one side, so that the embedding portion 35 is located inside the mounting seat 15, the insertion rod 20 is located inside the convex column 21, and the other end of the driven shaft 29 is located in the accommodation cavity 33. Subsequently, install the two driven gears 30 on the driven shaft 29, install the driving gear 28 at one end of the driving shaft 26 passing through the cover plate 23, and then connect the cover plate 23 and the mounting seat 15 with bolts, and make the first hexagonal limit portion 27 exposed on the outside.

[0035] S2: Pass the valve stem 6 through the connecting portion 7, then twist and install the rotating member 13 on the outside of the valve stem 6. Subsequently, fit the fixing member 25 on the outside of the rotating member 13 and thread it with the connecting portion 7. Then install the handwheel 11 on the outside of the rotating member 13, fit the spring 19 on the outside of the boss 24, and make the transmission rod 12 pass through the valve stem 6 from one end. Subsequently, install the nut 4 and the limit block 5 on the outside of the valve stem 6 and the transmission rod 12 respectively.

[0036] S3: Connect the valve stem 6 and the cover plate 23 with bolts, then assemble the wear-resistant member 17 in the valve seat 8. Subsequently, install the mounting seat 15 and the seal 16 from top to bottom into the inside of the protruding portion 9, and finally connect the sealing cover 2 and the valve seat 8 with bolts.

[0037] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0038] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A double-sealed ceramic gate valve, comprising a valve seat (8) and a valve stem (6), characterized in that, A channel (1) is provided in the valve seat (8), and a protruding portion (9) is provided in the middle thereof. A mounting seat (15) is slidably provided in the protruding portion (9). A sealing cover (2) is provided on the valve seat (8). A connecting portion (7) is provided on the sealing cover (2). A control member (3) for driving the valve stem (6) to drive the mounting seat (15) to move is provided on the connecting portion (7). Two sealing members (16) for blocking the channel (1) are slidably provided on the mounting seat (15). A receiving cavity (33) is provided in the middle of the mounting seat (15), and a cover plate (23) for closing the receiving cavity (33) is provided on the mounting seat (15). A transmission member (14) for driving the two sealing members (16) to move in opposite directions along the center line direction of the channel (1) is provided in the receiving cavity (33). The transmission member (14) includes a driving gear (28) and two driven gears (30). A driving shaft (26) is connected to the middle of the driving gear (28). One end of the valve stem (6) passing through the sealing cover (2) is connected to the cover plate (23) by a bolt. The end of the driving shaft (26) away from the driving gear (28) extends to the inside of the valve stem (6). A transmission rod (12) for driving the driving shaft (26) to rotate is provided inside the valve stem (6). A driven shaft (29) is connected to the middle of the driven gear (30). The end of the driven shaft (29) away from the driven gear (30) is threadedly connected to the sealing member (16). Three insertion rods (20) distributed in an array are provided on the sealing member (16). Ring protrusions (32) are provided on both sides of the mounting seat (15). A convex column (21) matching the insertion rod (20) is provided between the two ring protrusions (32). A convex portion (22) with a spherical structure is provided on one side of the sealing member (16) for blocking the channel (1). A wear-resistant member (17) matching the sealing member (16) is inlaid in the valve seat (8), and a rubber sealing ring for cooperating with the wear-resistant member (17) is provided on the sealing member (16).

2. The double-sealed ceramic gate valve according to claim 1, wherein, An embedding portion (35) is provided on one side of the sealing member (16) close to the ring protrusion (32), and a pressure-bearing table (31) is provided in the middle of the driven shaft (29).

3. The double-sealed ceramic gate valve according to claim 2, wherein, Two convex ribs (10) for positioning the mounting seat (15) are provided on the inner wall of the protruding portion (9), and a plurality of flow guiding grooves (34) are provided on the convex ribs (10).

4. A double-sealed ceramic gate valve according to claim 3, characterized in that, The control member (3) includes a rotating member (13), a fixing member (25) and a handwheel (11). The rotating member (13) is threadedly connected to the valve stem (6). The fixing member (25) is threadedly connected to the connecting portion (7), and the fixing member (25) is rotatably connected to the rotating member (13). The handwheel (11) is installed on the outside of the rotating member (13).

5. A double-sealed ceramic gate valve according to claim 4, characterized in that, A first hexagonal limiting portion (27) is provided on the driving shaft (26). A slot matching the first hexagonal limiting portion (27) is provided on the transmission rod (12), and a second hexagonal limiting portion (18) is provided at one end of the transmission rod (12) exposed outside the valve stem (6).

6. A double-sealed ceramic gate valve according to claim 5, characterized in that, One end of the transmission rod (12) connected to the driving shaft (26) has a boss (24). A spring (19) is arranged on the outer side of the boss (24). One end of the transmission rod (12) away from the boss (24) is detachably connected with a limit block (5). A nut (4) is arranged on the outer side of the valve rod (6).

7. An installation method of the double-sealed ceramic gate valve according to claim 6, characterized in that, It includes the following steps: S1: First, install the seal (16) at one end of the driven shaft (29), and then insert the two into the mounting seat (15) from one side, so that the embedding part (35) is located inside the mounting seat (15), the insertion rod (20) is located inside the convex column (21), the other end of the driven shaft (29) is located in the accommodating cavity (33). Subsequently, install the two driven gears (30) on the driven shaft (29), install the driving gear (28) at one end of the driving shaft (26) passing through the cover plate (23), then connect the cover plate (23) and the mounting seat (15) with bolts, and make the first hexagonal limiting part (27) exposed outside; S2: Pass the valve rod (6) through the connecting part (7), then screw and install the rotating part (13) on the outer side of the valve rod (6). Subsequently, sleuth the fixing part (25) on the outer side of the rotating part (13) and thread it with the connecting part (7). Then install the handwheel (11) on the outer side of the rotating part (13), sleuth the spring (19) on the outer side of the boss (24), and make the transmission rod (12) pass through the valve rod (6) from one end. Subsequently, install the nut (4) and the limit block (5) on the outer sides of the valve rod (6) and the transmission rod (12) respectively; S3: Connect the valve rod (6) and the cover plate (23) with bolts, then assemble the wear-resistant part (17) in the valve seat (8). Subsequently, install the mounting seat (15) and the seal (16) into the inside of the protruding part (9) from top to bottom. Finally, connect the seal cover (2) and the valve seat (8) with bolts.

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