Butterfly plate and valve shaft connecting structure of butterfly valve

Abstract

The butterfly plate and valve shaft connecting structure comprises a valve body, a valve cavity is formed in the valve body, a valve shaft is arranged in the valve cavity in a penetrating mode, a butterfly plate assembly is arranged on the valve shaft, a sinking groove is formed in one end of the valve body with the valve shaft as the center, one end of the valve shaft is located in the sinking groove, and the bottom wall of the sinking groove is a first guide inclined face. A sinking groove is formed in the valve shaft, a connecting piece is connected into the sinking groove in a threaded mode, the side, close to the first guide inclined face, of the connecting piece is a second guide inclined face, a limiting piece is movably arranged in the sinking groove and located between the first guide inclined face and the second guide inclined face, and a clamping groove is formed in the position, located in the sinking groove, of one side of the valve shaft along the circumference in a concave mode. The limiting piece can move up and down along with the connecting piece to be movably embedded into or separated from the clamping groove. The axial limiting stability between the valve shaft and the valve body is realized through the limiting piece; when the valve shaft needs to be maintained and disassembled, the valve shaft can be disassembled only by screwing the connecting piece to loosen the limiting piece to be separated from the clamping groove of the valve shaft, the structure is simple, and operation is convenient.

Description

Technical Field

[0001] The utility model relates to a butterfly plate valve shaft connection structure of a butterfly valve. Background Art

[0002] A butterfly valve is a regulating valve with a simple structure, also called a flap valve. It can be used for on-off control of low-pressure pipeline media. A butterfly valve refers to a valve whose closing member is a disc that rotates around the valve axis to achieve opening and closing.

[0003] However, the valve shafts of most existing butterfly valves are prone to axial slippage and loosening during use due to frequent opening and closing or long-term vibration of the pipeline. In the long run, the loose valve shafts are prone to leakage and cannot meet the use requirements. Utility Model Content

[0004] In view of the defects of the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a butterfly plate valve shaft connection structure of a butterfly valve.

[0005] A butterfly plate and valve shaft connection structure of a butterfly valve, including a valve body, a valve cavity is formed in the valve body, a valve shaft is arranged through the valve cavity, a butterfly plate assembly is arranged on the valve shaft, a groove is arranged at one end of the valve body with the valve shaft as the center, one end of the valve shaft is located in the groove, the bottom wall of the groove is a first guide bevel, a connecting piece is threadedly connected in the groove, the side of the connecting piece located close to the first guide bevel is a second guide bevel, a limiting piece is movably arranged in the groove between the first guide bevel and the second guide bevel, one side of the valve shaft is located in the groove and has a recessed groove along the circumference, and the limiting piece can be movably embedded in or detached from the recessed groove as the connecting piece moves up and down.

[0006] In one embodiment, the first guide slope and the second guide slope are both inclined surfaces that are slanted downward from the center line of the sink groove toward the circumference, and the first guide slope and the second guide slope are not parallel to each other.

[0007] In one embodiment, a plurality of groups of guide members protrude outwardly along the circumference at intervals on the second guide slope, the guide members include two flanges arranged in parallel at intervals, and the limit member is movably arranged between the two flanges.

[0008] In one embodiment, the butterfly plate assembly includes a disc plate, which has a connecting cavity with upper and lower openings. The valve shaft is arranged in the connecting cavity. A locking hole connected to the connecting cavity is provided on one side of the disc plate. A locking pin is provided in the locking hole, and the locking pin abuts against one side of the valve shaft.

[0009] In one embodiment, the butterfly plate assembly further includes a wear-resistant and corrosion-resistant outer plate disposed on one side of the disc plate.

[0010] In one embodiment, a sealing strip capable of abutting against the peripheral edge of the disc plate is provided along the circumference of the inner side of the valve cavity.

[0011] In one embodiment, the sealing strip is clamped on the valve body by a fixed sealing cover.

[0012] In one embodiment, the limiting member is a ball.

[0013] In summary, the beneficial effects of the present invention compared with the prior art are as follows:

[0014] When the valve shaft and the valve body are installed, the utility model screws the connecting piece in the recessed groove of the valve body to make the connecting piece move along the axial thread of the recessed groove, and then the first guide inclined surface of the connecting piece cooperates with the second guide inclined surface of the bottom wall of the recessed groove to force the limiting piece to move toward the clamping groove direction of the valve shaft, and finally the limiting piece is displaced and embedded in the clamping groove, so that the axial limiting stability between the valve shaft and the valve body is achieved through the limiting piece;

[0015] When the valve shaft needs to be disassembled for maintenance, it is only necessary to screw the connecting piece to loosen the limiting piece and disengage it from the slot of the valve shaft to realize the disassembly of the valve shaft. The structure is simple and the operation is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is one of the cross-sectional structural schematic diagrams of a butterfly plate valve shaft connection structure of a butterfly valve in one embodiment of the utility model;

[0017] Figure 2 This is a second schematic cross-sectional structure diagram of a butterfly plate valve shaft connection structure of a butterfly valve in one embodiment of the utility model;

[0018] Figure 3 This is one of the three-dimensional structural schematic diagrams of a butterfly plate valve shaft connection structure of a butterfly valve in one embodiment of the utility model;

[0019] Figure 4 This is a second three-dimensional structural schematic diagram of a butterfly plate valve shaft connection structure of a butterfly valve in one embodiment of the utility model;

[0020] Figure 5 The present invention is a partial structural schematic diagram of a butterfly plate valve shaft connection structure of a butterfly valve in one embodiment of the present invention. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods:

[0022] like Figures 1 to 5The embodiment of the utility model shown preferably provides a butterfly plate valve shaft connection structure of a butterfly valve, including a valve body 1, a valve cavity 2 is formed in the valve body 1, a valve shaft 3 is arranged through the valve cavity 2, a butterfly plate assembly 4 is arranged on the valve shaft 3, a recessed groove 5 is arranged at one end of the valve body 1 with the valve shaft 3 as the center, one end of the valve shaft 3 is located in the recessed groove 5, the bottom wall of the recessed groove 5 is a first guide bevel 6, a connecting piece 7 is threadedly connected to the recessed groove 5, the connecting piece 7 is located on the side close to the first guide bevel 6 as a second guide bevel 8, a limiting piece 9 is movably arranged in the recessed groove 5 between the first guide bevel 6 and the second guide bevel 8, one side of the valve shaft 3 is located in the recessed groove 5 and has a recessed groove 10 concave along the circumference, and the limiting piece 9 can be movably embedded in or detached from the recessed groove 10 as the connecting piece 7 moves up and down.

[0023] Specifically, Figure 1 to Figure 2 As shown, when the valve shaft and the valve body are installed, the connecting piece in the groove of the valve body is screwed to make the connecting piece move along the axial thread of the groove, and then the first guide bevel of the connecting piece cooperates with the second guide bevel of the bottom wall of the groove to force the limit piece to move toward the groove direction of the valve shaft, and finally the limit piece is moved and embedded in the groove, so that the axial limit between the valve shaft and the valve body is stable through the limit piece; and when the valve shaft needs to be maintained and disassembled, it is only necessary to screw the connecting piece to loosen the limit piece and disengage it from the groove of the valve shaft to realize the disassembly of the valve shaft. The structure is simple and the operation is convenient.

[0024] Further, Figure 1 to Figure 2 As shown, both the first guide bevel 6 and the second guide bevel 8 are inclined surfaces that are inclined downward from the center line of the sink groove 5 to the circumference, and the first guide bevel 6 and the second guide bevel 8 are not parallel to each other. Specifically, both the first guide bevel and the second guide bevel are inclined surfaces that are inclined downward from the center to the circumference, so that the spacing between the first guide bevel and the second guide bevel at the end away from the center of the sink groove is smaller than the spacing between the first guide bevel and the second guide bevel at the end close to the center of the sink groove, and when the two non-parallel first guide bevels and the second guide bevels are relatively moved closer with the screwing of the connecting piece, the two can force the limiter to move from the end away from the center of the sink groove to the center of the sink groove, thereby driving the limiter to move and embed in the clamping groove of the valve shaft; on the contrary, when the first guide bevel and the second guide bevel are relatively moved away with the screwing of the connecting piece, the limiter is freed from the interference between the two, and the limiter can be separated from the clamping groove through the inclined surface tilting.

[0025] Furthermore, if Figure 5 As shown, the second guide slope 8 has several groups of guide members protruding outward along the circumference at intervals, and the guide members include two flanges 11 arranged in parallel at intervals, and the limiter 9 is movably arranged between the two flanges 11. Then, the displacement of the limiter is guided by the two flanges.

[0026] Furthermore, the butterfly plate assembly includes a disc plate 12, wherein the disc plate 12 has a connecting cavity 13 with upper and lower openings, wherein the valve shaft 3 is arranged in the connecting cavity 13, wherein one side of the disc plate 12 is provided with a locking hole 14 communicating with the connecting cavity 13, wherein the locking hole 14 is provided with a locking pin 15, wherein the locking pin 15 abuts against one side of the valve shaft 3. The disc plate is then connected and installed with the valve shaft through the locking pin.

[0027] Furthermore, the butterfly plate assembly further includes a wear-resistant and corrosion-resistant outer plate 16 disposed on one side of the disc plate 12. This further enhances the wear resistance and corrosion resistance of the disc plate, thereby effectively increasing the service life.

[0028] Furthermore, a sealing strip 17 is circumferentially provided on the inner side of the valve cavity 2 and can abut against the peripheral edge of the disc plate 12 .

[0029] Furthermore, the sealing strip 17 is clamped on the valve body 1 by a fixed sealing cover 18 .

[0030] Furthermore, the stopper 9 is a ball, and the ball is pressed by the first guide bevel and the second guide bevel to force it to move.

[0031] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments. The above embodiments and the description are only to illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A butterfly valve plate and valve shaft connection structure of a butterfly valve, comprising a valve body (1), a valve cavity (2) formed in the valve body (1), a valve shaft (3) penetrating the valve cavity (2), a butterfly valve assembly (4) arranged on the valve shaft (3), characterized in that: A recessed groove (5) is provided at one end of the valve body (1) with the valve shaft (3) as the center, one end of the valve shaft (3) is located in the recessed groove (5), the bottom wall of the recessed groove (5) is a first guide bevel (6), a connecting piece (7) is connected to the inner thread of the recessed groove (5), the connecting piece (7) is located on the side close to the first guide bevel (6) as a second guide bevel (8), a limiting piece (9) is movably provided in the recessed groove (5) between the first guide bevel (6) and the second guide bevel (8), one side of the valve shaft (3) is located in the recessed groove (5) and is concave with a groove (10) along the circumference, and the limiting piece (9) can be moved up and down with the connecting piece (7) and movably embedded in or detached from the groove (10).

2. The butterfly valve shaft connection structure of a butterfly valve according to claim 1, characterized in that: The first guide slope (6) and the second guide slope (8) are both inclined surfaces that are inclined downwards from the center line of the sink groove (5) to the circumference, and the first guide slope (6) and the second guide slope (8) are not arranged parallel to each other.

3. The butterfly valve shaft connection structure of a butterfly valve according to claim 1, characterized in that: A plurality of groups of guide components are protruded outwardly at intervals along the circumference of the second guide inclined surface (8), the guide components comprising two flanges (11) arranged in parallel at intervals, and the limiting member (9) is movably arranged between the two flanges (11).

4. The butterfly valve shaft connection structure of a butterfly valve according to claim 1, characterized in that: The butterfly plate assembly comprises a disc plate (12), wherein the disc plate (12) has a connecting cavity (13) with upper and lower openings, and the valve shaft (3) is arranged in the connecting cavity (13). A locking hole (14) connected to the connecting cavity (13) is arranged on one side of the disc plate (12), and a locking pin (15) is arranged in the locking hole (14), and the locking pin (15) abuts against one side of the valve shaft (3).

5. The butterfly valve shaft connection structure of a butterfly valve according to claim 4, characterized in that: The butterfly plate assembly also includes a wear-resistant and corrosion-resistant outer plate (16) arranged on one side of the disc plate (12).

6. The butterfly valve shaft connection structure of a butterfly valve according to claim 4, characterized in that: A sealing strip (17) is provided along the circumference of the inner side of the valve cavity (2) and is capable of abutting against the circumferential edge of the disc plate (12).

7. The butterfly valve shaft connection structure of a butterfly valve according to claim 6, characterized in that: The sealing strip (17) is clamped on the valve body (1) by a fixed sealing cover (18).

8. The butterfly valve shaft connection structure of a butterfly valve according to claim 1, characterized in that: The limiting member (9) is a ball.

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