Metal hard-to-hard butterfly valve

Abstract

The utility model discloses a metal hard-to-hard butterfly valve which comprises a valve body, a valve rod and a butterfly plate, the valve rod penetrates through the valve body and is in linkage connection with the butterfly plate arranged in the valve body, and a valve seat is arranged in the valve body. The valve further comprises a locking assembly, the locking assembly comprises a plug pin and a spring, a locking block is arranged on the side portion of the plug pin, the valve rod is provided with a locking hole for the plug pin to penetrate through and an inner inlet and outlet for the locking block to pass through, and the inner end of the inner inlet and outlet is provided with an arc-shaped groove for the locking block to pass through on the vertical face. An inserting hole is formed in the butterfly plate in the vertical direction, the valve rod penetrates through the inserting hole, an outer inlet and outlet and a linkage groove are formed in the positions, corresponding to the two ends of the locking hole in the valve rod, of the butterfly plate respectively, one end of the valve rod extends into the linkage groove, and the other end of the valve rod extends into the linkage groove. The spring is arranged in the linkage groove and abuts against the inner end of the plug pin. According to the butterfly valve, the butterfly plate and the valve rod are convenient to disassemble and assemble, and early-stage assembly production and later-stage disassembly and maintenance operation are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a metal-on-hard butterfly valve. Background Art

[0002] The butterfly valve, also known as the flap valve, is a regulating valve with a simple structure. It is a closing part that can be used for the on-off control of low-pressure pipeline media. Butterfly valves are now mostly used to control media such as water. They can cut off and throttle the water flow in the pipeline. In today's pipeline construction, valves such as butterfly valves are indispensable parts. With the rapid development of pipeline technology, the use of valves presents a better development prospect.

[0003] The utility model patent with the patent publication (announcement) number CN217003124U discloses a metal hard-to-hard butterfly valve, which includes a valve body, a valve stem and a valve plate. The valve body is provided with a flow channel for medium circulation, the valve plate is arranged on the valve stem and rotates with the valve stem, the valve body is provided with an annular groove protruding in the vertical direction, a moving block moving in the vertical direction is arranged in the annular groove, a clamping spring is arranged between the bottom of the annular groove and the moving block, and a sealing plate sealingly matched with the valve plate is arranged at the other end of the moving block relative to the clamping spring. Among them, the connection method between the valve plate and the valve stem of the butterfly valve is the same as the conventional connection method currently on the market, that is, the two are connected by a cylindrical pin. Although the structural reliability of this connection method is good, the disassembly operation of this connection method is relatively difficult when it is disassembled in the later stage because the cylindrical pin is installed with interference fit. If the cylindrical pin cannot be taken out, it is necessary to drill out the cylindrical pin, or drill a screw hole on the cylindrical pin, and then pull out the cylindrical pin after screwing. In short, this connection structure is not conducive to the disassembly operation of the valve plate in the later stage. Utility Model Content

[0004] The utility model aims to provide a metal-on-metal butterfly valve, which is convenient for disassembly and assembly of a butterfly plate and a valve stem, and is beneficial to early assembly production and later disassembly and maintenance operations.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a metal hard-to-hard butterfly valve, comprising a valve body, a valve stem and a butterfly plate, the valve stem passes through the valve body and is linked to the butterfly plate arranged inside the valve body, the inner wall of the valve body is provided with a valve seat for tightly fitting with the outer edge of the butterfly plate when the valve is closed; and also includes a locking assembly for connecting the valve stem and the butterfly plate, the locking assembly comprises a latch and a spring, a locking block is provided on the side of the latch, a locking hole for the latch to pass through and an inner inlet and outlet for the locking block to pass through are radially provided on the upper side of the valve stem, an arc groove for the locking block to pass through is provided on the vertical plane at the inner end of the inner inlet and outlet, a locking groove for the locking block to be embedded is radially provided on one end of the arc groove away from the inner inlet and outlet, a plug hole is vertically opened on the upper side of the butterfly plate, the valve stem passes through the plug hole, and the positions on the butterfly plate corresponding to the two ends of the locking hole on the valve stem are respectively provided with an outer inlet and outlet and a linkage groove, one end of the valve stem extends into the linkage groove, and the spring is arranged in the linkage groove and abuts against the inner end of the latch.

[0006] By adopting the above technical solution, during installation, first install the spring into the linkage groove of the butterfly plate, then pass the valve stem through the jack on the butterfly plate, and then pass the latch through the outer inlet and outlet of the butterfly plate, the inner inlet and outlet of the valve stem, and the locking hole of the valve stem in sequence, until the latch is partially inserted into the linkage groove of the butterfly plate and squeezes the spring, the spring is compressed and stored, and the latch is rotated clockwise, so that the locking block on the latch rotates in the arc groove, until the locking block moves to the end of the arc groove, the latch is retreated by the elastic force released by the spring, so that the locking block is pressed into the locking groove, and the locking installation of the butterfly plate and the valve stem is realized; during disassembly, first push the latch inward to overcome the spring force and move axially, until the locking block is completely out of the locking groove, rotate the latch counterclockwise, and the latch rotates along the arc groove until the locking block reaches the inner inlet and outlet position, and the latch moves outward under the action of the spring force released by the spring, and finally the latch is pulled out. The structure is used to lock the butterfly plate and the valve stem, and the disassembly and assembly are very convenient, which is conducive to the early assembly production and the later disassembly and maintenance operations.

[0007] The utility model is further configured that the outer end of the latch is provided with a straight groove.

[0008] By adopting the above technical solution, the latch can be rotated by a flat-blade screwdriver.

[0009] The utility model is further configured that the outer periphery of the latch is provided with an annular groove for inserting a clamping tool.

[0010] By adopting the above technical solution, the operation of pulling out the latch is more convenient.

[0011] The utility model is further configured such that the locking block and the latch are an integrated structure.

[0012] By adopting the above technical solution, the structure is simple, reliable and has high strength.

[0013] The utility model is further configured that a screw hole is provided on a side portion of the latch pin, and the locking block is threadably matched with the screw hole.

[0014] By adopting the technical solution, the processing is convenient and the production is facilitated.

[0015] The utility model is further configured that a mounting groove is opened on the side of the valve stem, a mounting block is embedded in the mounting groove, and the mounting block is welded to the valve stem, and the inner inlet and outlet, the arc groove and the locking groove are all arranged at the inner end of the mounting block.

[0016] By adopting the above technical solution, the processing of the inner inlet and outlet, the arc groove and the locking groove is convenient, and the mounting block is welded on the valve stem, so the connection is firm.

[0017] The utility model is further configured such that a hard sealing assembly is also provided on the butterfly plate, and the hard sealing assembly includes a pressure ring and a metal sealing ring. An annular sealing groove is provided on the butterfly plate, and the pressure ring is mounted on the butterfly plate by a fastener, and the pressure ring presses the metal sealing ring in the annular sealing groove, and the outer cylindrical surface of the metal sealing ring protrudes from the outer cylindrical surface of the butterfly plate.

[0018] By adopting the above technical solution, a detachable metal sealing ring is arranged on the butterfly plate. When the metal sealing ring is severely worn, only the metal sealing ring needs to be replaced without replacing the entire butterfly plate, thereby reducing the subsequent maintenance cost.

[0019] The utility model is further configured that an annular reinforcement flange is respectively provided at both ends of the outer cylindrical surface of the metal sealing ring, and the two annular reinforcement flanges are respectively tightly pressed against the outer cylindrical surface of the butterfly plate and the outer cylindrical surface of the pressure ring.

[0020] By adopting the above technical solution, the strength of the sealing part of the metal sealing ring can be improved, thereby increasing the service life of the metal sealing ring.

[0021] The utility model is further configured that the inner end surface of the annular sealing groove and the inner end surface of the pressure ring are both provided with O-rings for forming a sealing fit with the metal sealing ring.

[0022] By adopting the above technical solution, the sealing between the metal sealing ring and the butterfly plate, and between the metal sealing ring and the pressure ring can be ensured, thereby preventing the medium from leaking from the gap between the metal sealing ring and the butterfly plate, and between the metal sealing ring and the pressure ring when the valve is closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0024] Figure 2 for Figure 1 The enlarged structural diagram of the middle A part;

[0025] Figure 3 This is a schematic diagram of the structure of the installation block of the utility model;

[0026] Figure 4 This is a schematic diagram of the first structure of the latch and the locking block of the utility model;

[0027] Figure 5 This is a second structural schematic diagram of the latch and the locking block of the utility model.

[0028] In the figure: 1. valve body; 2. valve stem; 3. butterfly plate; 4. valve seat; 5. locking assembly; 6. latch; 7. spring; 8. locking block; 9. locking hole; 10. inner inlet and outlet; 11. arc groove; 12. locking groove; 13. plug hole; 14. outer inlet and outlet; 15. linkage groove; 16. straight groove; 17. annular groove; 18. screw hole; 19. mounting groove; 20. mounting block; 21. hard sealing assembly; 22. pressure ring; 23. metal sealing ring; 24. annular sealing groove; 25. annular reinforcement flange; 26. O-ring. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Example: As attached Figures 1 to 5The metal hard-to-hard butterfly valve shown in the figure has a valve seat 4 provided on the wall for tightly fitting with the outer edge of the butterfly plate 3 when the valve is closed, and the valve seat 4 and the valve body 1 are an integrated structure; the butterfly valve also includes a locking assembly 5 for connecting the valve stem 2 and the butterfly plate 3, the locking assembly 5 includes a latch 6 and a spring 7, a locking block 8 is provided on the side of the latch 6, and the latch 6 and the locking block 8 are both cylindrical structures, and a locking hole 9 for the latch 6 to pass through and an inner inlet and outlet 10 for the locking block 8 to pass through are radially provided on the valve stem 2, and the inner end of the inner inlet and outlet 10 is provided with a vertical surface for the locking block 8 to pass through. The arc groove 11 passes through, the height of the arc groove 11 is adapted to the diameter of the locking block 8, the end of the arc groove 11 away from the inner inlet and outlet 10 is radially provided with a locking groove 12 for the locking block 8 to be embedded, a plug hole 13 is vertically opened on the butterfly plate 3, the valve stem 2 passes through the plug hole 13, and the positions of the butterfly plate 3 corresponding to the two ends of the locking hole 9 on the valve stem 2 are respectively provided with an outer inlet and outlet 14 and a linkage groove 15, the diameters of the linkage groove 15 and the plug hole 13 are equivalent to the diameter of the bolt 6, one end of the valve stem 2 extends into the linkage groove 15, and the spring 7 is arranged in the linkage groove 15 and against the inner end of the bolt 6. During installation, first install the spring 7 into the linkage groove 15 of the butterfly plate 3, then pass the valve stem 2 through the socket 13 on the butterfly plate 3, and then pass the latch 6 through the outer inlet and outlet 14 of the butterfly plate 3, the inner inlet and outlet 10 of the valve stem 2, and the locking hole 9 of the valve stem 2 in sequence, until the latch 6 is partially inserted into the linkage groove 15 of the butterfly plate 3 and squeezes the spring 7. The spring 7 is compressed to store energy, and the latch 6 is rotated clockwise, so that the locking block 8 on the latch 6 rotates in the arc groove 11 until the locking block 8 moves to the end of the arc groove 11. The latch 6 is retracted by the elastic force released by the spring 7, so that the locking block 8 is pressed into the locking groove 12, and the butterfly plate 3 and the valve stem 2 are locked and installed; when disassembling, the latch 6 is first pushed inward to overcome the force of the spring 7 and move axially until the locking block 8 is completely out of the locking groove 12, and then the latch 6 is rotated counterclockwise, and the latch 6 rotates along the arc groove 11 until the locking block 8 reaches the position of the inner inlet and outlet 10. The latch 6 moves outward under the force of the spring 7 released by the spring 7, and finally the latch 6 is pulled out. The structure is used to lock the butterfly plate 3 and the valve stem 2, and the disassembly and assembly are very convenient, which is conducive to the early assembly production and the later disassembly and maintenance operations.

[0031] As attached Figure 2 As shown, a straight groove 16 is provided at the outer end of the latch 6, and the latch 6 can be rotated by a straight screwdriver.

[0032] As attached Figure 2 As shown, the outer periphery of the latch 6 is provided with an annular groove 17 for inserting a clamping tool. This design makes it easier to pull out the latch 6.

[0033] As attached Figure 4As shown, the locking block 8 and the latch pin 6 can be designed as an integrated structure, which has a simple, reliable and high strength.

[0034] As attached Figure 5 As shown, the structure of the latch 6 and the locking block 8 can also be as follows: a screw hole 18 is provided on the side of the latch 6, and the locking block 8 is threadedly matched with the screw hole 18, that is, the outer periphery of the locking block 8 has an external thread that matches the screw hole 18, which is easy to process and facilitates production.

[0035] As attached Figure 2 and attached Figure 3 As shown, a mounting groove 19 is provided on the side of the valve stem 2, a mounting block 20 is embedded in the mounting groove 19, and the mounting block 20 is welded to the valve stem 2, the inner inlet and outlet 10, the arc groove 11 and the locking groove 12 are all arranged at the inner end of the mounting block 20, and the outer side of the mounting block 20 is in an arc shape that matches the outer side of the valve stem 2. This design facilitates the processing of the inner inlet and outlet 10, the arc groove 11 and the locking groove 12, and the mounting block 20 is welded on the valve stem 2, and the connection is firm.

[0036] As attached Figure 2 As shown, the butterfly plate 3 is also provided with a hard seal component 21, and the hard seal component 21 includes a pressure ring 22 and a metal seal ring 23. The butterfly plate 3 is provided with an annular seal groove 24. The pressure ring 22 is installed on the butterfly plate 3 by a fastener, and the fastener is a screw. The pressure ring 22 presses the metal seal ring 23 in the annular seal groove 24, and the outer cylindrical surface of the metal seal ring 23 protrudes from the outer cylindrical surface of the butterfly plate 3. A detachable metal seal ring 23 is provided on the butterfly plate 3. When the metal seal ring 23 is severely worn, only the metal seal ring 23 needs to be replaced, and there is no need to replace the entire butterfly plate 3, thereby reducing the later maintenance cost.

[0037] As attached Figure 2 As shown, an annular reinforcement flange 25 is respectively provided at both ends of the outer cylindrical surface of the metal sealing ring 23, and the two annular reinforcement flanges 25 are respectively tightly pressed against the outer cylindrical surface of the butterfly plate 3 and the outer cylindrical surface of the pressure ring 22. This design can improve the strength of the sealing part of the metal sealing ring 23, thereby improving the service life of the metal sealing ring 23.

[0038] As attached Figure 2 As shown, the inner end surface of the annular sealing groove 24 and the inner end surface of the pressing ring 22 are both provided with an O-ring 26 for forming a sealing match with the metal sealing ring 23. This design can ensure the sealing between the metal sealing ring 23 and the butterfly plate 3, and between the metal sealing ring 23 and the pressing ring 22, and prevent the medium from leaking from the gap between the metal sealing ring 23 and the butterfly plate 3, and between the metal sealing ring 23 and the pressing ring 22 when the valve is closed.

Claims

1. A metal-on-metal butterfly valve, comprising a valve body (1), a valve stem (2) and a butterfly plate (3), wherein the valve stem (2) penetrates the valve body (1) and is linked to the butterfly plate (3) arranged inside the valve body (1), and the inner wall of the valve body (1) is provided with a valve seat (4) for tightly fitting with the outer edge of the butterfly plate (3) when the valve is closed; characterized in that: The valve stem (2) further comprises a locking assembly (5) for connecting the valve stem (2) and the butterfly plate (3), the locking assembly (5) comprising a latch (6) and a spring (7), a locking block (8) being arranged on the side of the latch (6), a locking hole (9) for the latch (6) to pass through and an inner inlet (10) for the locking block (8) to pass through being arranged radially on the valve stem (2), an arc groove (11) for the locking block (8) to pass through being arranged on the inner end of the inner inlet (10) on a vertical surface, the arc groove (11) A locking groove (12) for inserting a locking block (8) is radially arranged at one end away from the inner inlet and outlet (10); a plug hole (13) is vertically opened on the upper edge of the butterfly plate (3); the valve stem (2) passes through the plug hole (13); an outer inlet and outlet (14) and a linkage groove (15) are respectively arranged on the butterfly plate (3) at positions corresponding to the two ends of the locking hole (9) on the valve stem (2); one end of the valve stem (2) extends into the linkage groove (15); the spring (7) is arranged in the linkage groove (15) and abuts against the inner end of the latch (6).

2. A metal-on-hard butterfly valve according to claim 1, characterized in that: The outer end of the latch pin (6) is provided with a straight groove (16).

3. A metal-on-hard butterfly valve according to claim 2, characterized in that: The outer periphery of the latch pin (6) is provided with an annular groove (17) for inserting a clamping tool.

4. The metal-on-metal butterfly valve according to claim 1, characterized in that: The locking block (8) and the latch pin (6) are an integrated structure.

5. The metal-on-metal butterfly valve according to claim 1, characterized in that: A screw hole (18) is provided on the side of the latch pin (6), and the locking block (8) is threadedly matched with the screw hole (18).

6. The metal-on-metal butterfly valve according to claim 1, characterized in that: The valve stem (2) has a mounting groove (19) on its side, a mounting block (20) is embedded in the mounting groove (19), and the mounting block (20) is welded to the valve stem (2), and the inner inlet and outlet (10), the arc groove (11) and the locking groove (12) are all arranged at the inner end of the mounting block (20).

7. The metal-on-metal butterfly valve according to claim 1, characterized in that: The butterfly plate (3) is also provided with a hard sealing component (21), the hard sealing component (21) comprising a pressure ring (22) and a metal sealing ring (23), the butterfly plate (3) is provided with an annular sealing groove (24), the pressure ring (22) is mounted on the butterfly plate (3) by means of a fastener, and the pressure ring (22) presses the metal sealing ring (23) tightly into the annular sealing groove (24), and the outer circumferential surface of the metal sealing ring (23) protrudes from the outer circumferential surface of the butterfly plate (3).

8. The metal-on-metal butterfly valve according to claim 7, characterized in that: An annular reinforcement flange (25) is respectively provided at both ends of the outer cylindrical surface of the metal sealing ring (23), and the two annular reinforcement flanges (25) are respectively tightly pressed against the outer cylindrical surface of the butterfly plate (3) and the outer cylindrical surface of the pressure ring (22).

9. The metal-on-metal butterfly valve according to claim 7, characterized in that: The inner end surface of the annular sealing groove (24) and the inner end surface of the pressure ring (22) are both provided with an O-ring (26) for forming a sealing fit with the metal sealing ring (23).

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