A high-precision hydraulic control butterfly valve

Abstract

A high-precision hydraulic control butterfly valve belongs to the technical field of butterfly valves, and particularly relates to a high-precision hydraulic control butterfly valve. The present invention provides a high-precision hydraulic control butterfly valve with high connection precision between the butterfly plate and the valve shaft and easy to produce and process. The present invention includes a crank, a valve shaft and a butterfly plate, and is characterized in that: an axial hole matching with the valve shaft is arranged on the side surface of the butterfly plate, and connecting screw holes are arranged in a circular arrangement in the axial hole; the crank, the valve shaft and the butterfly plate are connected into one body through tension screws corresponding to the connecting screw holes one by one, one end of the tension screw is connected with the connecting screw hole; the other end of the tension screw passes through the valve shaft and the crank and is connected with a compression nut.

Description

Technical Field

[0001] The present invention belongs to the technical field of butterfly valves, and particularly relates to a high-precision hydraulic control butterfly valve. Background Art

[0002] Traditional butterfly valves, as Figure 4 shown, include a valve body 100. Inside the valve body 100, there is a butterfly plate 200. Generally, the connection and power transmission between the butterfly plate 200 and the valve shaft 400 are connected by pins 300 and keys 500. This connection method is only applicable to medium and small-sized butterfly valves. When the diameter specification of the butterfly valve is large or extra-large, the connection accuracy of this connection method cannot meet the requirements. At the same time, the processing means of this method also cannot meet the needs of the product. Summary of the Invention

[0003] The present invention aims at the above problems and provides a high-precision hydraulic control butterfly valve with high connection accuracy between the butterfly plate and the valve shaft and easy production and processing.

[0004] To achieve the above object of the present invention, the present invention adopts the following technical solutions. The present invention includes a crank, a valve shaft, and a butterfly plate, and is characterized in that: an axial hole matching with the valve shaft is arranged on the side of the butterfly plate, and connecting screw holes are arranged in an annular distribution in the axial hole. The crank, the valve shaft, and the butterfly plate are connected into one body by tension screws corresponding to the connecting screw holes one by one. One end of the tension screw is connected to the connecting screw hole; the other end of the tension screw passes through the valve shaft and the crank and is connected to a compression nut.

[0005] As a preferred solution of the present invention, a first installation groove is arranged on the butterfly plate, and the connecting screw holes are arranged at the center of the first installation groove; a second installation groove is arranged on the crank, and the tension screw passes through the center of the second installation groove; third installation grooves corresponding to the first installation groove and the second installation groove are arranged at both ends of the valve shaft; positioning blocks are arranged in the corresponding first installation groove and third installation groove, and in the corresponding second installation groove and third installation groove.

[0006] Further, a first positioning sleeve matching with the positioning block is arranged in the first installation groove, a second positioning sleeve matching with the positioning block is arranged in the second installation groove, and a third positioning sleeve matching with the positioning block is arranged in the third installation groove.

[0007] As another preferred solution of the present invention, it further includes a valve body. A bushing is arranged between the valve body and the valve shaft, and a packing seal assembly of the valve shaft is arranged on one side of the crank on the valve body.

[0008] Further, the packing seal assembly includes a stuffing box, a sealing packing is arranged in the stuffing box, and a gland for the sealing packing is arranged on the stuffing box.

[0009] Advantages of the Present Invention:

[0010] In the present invention, a pull screw and a compression nut are cooperated to connect a butterfly plate, a crank and a valve shaft in series, forming a multi-point positioning and over-force clamping friction force transmission mechanism; the positioning block of the present invention can accurately position the valve shaft and the crank, as well as the valve shaft and the butterfly plate in the circumferential direction. It can also be used to transmit the power in the circumferential direction of the valve shaft.

[0011] A set of n pull screws, compression nuts and connecting screw holes are used to compress the crank, the valve shaft and the butterfly plate together. Thereby, a huge frictional force is generated on the contact surfaces of the crank, the valve shaft and the butterfly plate, and this huge frictional force is sufficient to transmit the power torque when the butterfly plate of the valve is normally opened and closed. Brief Description of the Drawings

[0012] Figure 1 is a schematic structural diagram of the present invention.

[0013] Figure 2 is Figure 1 the side view of

[0014] Figure 3 is Figure 1 the partial enlarged view of

[0015] Figure 4 is a schematic structural diagram of the connection structure of the butterfly plate and the valve shaft in the prior art.

[0016] In the drawings, 1 is the crank, 2 is the valve shaft, 3 is the butterfly plate, 4 is the valve body, 5 is the pull screw, 6 is the second positioning sleeve, 7 is the third positioning sleeve, 8 is the positioning block, 9 is the gland, 10 is the stuffing box, 11 is the sealing packing, 12 is the bushing, 13 is the connecting screw hole, 14 is the first positioning sleeve, 15 is the first installation groove, 16 is the third installation groove, 17 is the shaft hole, 18 is the second installation groove, 19 is the compression nut. Detailed Embodiments

[0017] The present invention includes a crank 1, a valve shaft 2 and a butterfly plate 3, and is characterized in that: an axial hole 17 for cooperating with the valve shaft 2 is arranged on the side of the butterfly plate 3, and connecting screw holes 13 are arranged in an annular distribution in the axial hole 17. The crank 1, the valve shaft 2 and the butterfly plate 3 are connected integrally by pull screws 5 corresponding to the connecting screw holes 13 one by one. One end of the pull screw 5 is connected to the connecting screw hole 13; the other end of the pull screw 5 passes through the valve shaft 2 and the crank 1 and is connected to a compression nut 19.

[0018] As a preferred embodiment of the present invention, a first mounting groove 15 is provided on the butterfly plate 3, and the connecting screw hole 13 is disposed at the center of the first mounting groove 15; a second mounting groove 18 is provided on the crank 1, and the tension screw 5 passes through the center of the second mounting groove 18; third mounting grooves 16 corresponding to the first mounting groove 15 and the second mounting groove 18 are provided at both ends of the valve shaft 2; positioning blocks 8 are provided in the corresponding first mounting groove 15 and third mounting groove 16, and in the corresponding second mounting groove 18 and third mounting groove 16.

[0019] Furthermore, a first positioning sleeve 14 cooperating with the positioning block 8 is provided in the first mounting groove 15, a second positioning sleeve 6 cooperating with the positioning block 8 is provided in the second mounting groove 18, and a third positioning sleeve 7 cooperating with the positioning block 8 is provided in the third mounting groove 16.

[0020] As another preferred embodiment of the present invention, it further includes a valve body 4. A bushing 12 is provided between the valve body 4 and the valve shaft 2, and a stuffing box seal assembly for the valve shaft 2 is provided on one side of the valve body 4 where the crank 1 is located.

[0021] Furthermore, the stuffing box seal assembly includes a stuffing box 10, a sealing packing 11 is provided in the stuffing box 10, and a gland 9 for the sealing packing 11 is provided on the stuffing box 10.

[0022] Working principle: As Figures 1 to 3 shown, the valve shaft 2 connects the power mechanism of the butterfly valve in series with the butterfly plate 3 and the crank 1 through the bushing 12 in the valve body 4, and is positioned and clamped by a multi-point positioning and over-force clamping friction force transmission mechanism composed of a positioning sleeve, a positioning block 8, a tension screw 5, a compression nut 19, etc. Thus, precise positioning and compression and power transmission are achieved between the butterfly plate 3 and the valve shaft 2, and between the valve shaft 2 and the crank 1. The multi-point positioning and over-force clamping friction force transmission mechanism has two main functions: (1) Precise positioning in the circumferential direction of the valve shaft 2 rotation is achieved through the cooperation of the positioning sleeve and the positioning block 8 between the valve shaft 2 and the crank 1 and between the valve shaft 2 and the butterfly plate 3. At the same time, it can also be used to transmit the power in the circumferential direction of the valve shaft 2.

[0023] (2) The crank 1, the valve shaft 2, and the butterfly plate 3 are pressed together through a set of n tension screws 5 and compression nuts 19, and the connecting screw holes 13 in the shaft hole 17 of the butterfly plate 3. Thus, a huge frictional force is generated between the end faces of the crank 1 and the valve shaft 2 and between the end faces of the butterfly plate 3 and the valve shaft 2, and this huge frictional force is sufficient to transmit the power torque when the butterfly plate 3 of the valve is normally opened and closed.

[0024] It is understandable that the above specific description of the present invention is only for explaining the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those of ordinary skill in the art should understand that the present invention can still be modified or equivalently replaced to achieve the same technical effects; as long as the use requirements are met, they are all within the protection scope of the present invention.

Claims

1. A high-precision hydraulic control butterfly valve, comprising a crank (1), a valve shaft (2) and a butterfly plate (3), characterized in that: On the side of the butterfly plate (3), a shaft hole (17) matching with the valve shaft (2) is provided. Connecting screw holes (13) are arranged in a circular pattern within the shaft hole (17). The crank (1), valve shaft (2), and butterfly plate (3) are connected integrally by tension screws (5) corresponding one by one to the connecting screw holes (13). One end of the tension screw (5) is connected to the connecting screw hole (13); the other end of the tension screw (5) passes through the valve shaft (2) and the crank (1) and is connected to a compression nut (19). A first installation groove (15) is provided on the butterfly plate (3), and the connecting screw hole (13) is arranged at the center of the first installation groove (15); a second installation groove (18) is provided on the crank (1), and the tension screw (5) passes through the center of the second installation groove (18); both ends of the valve shaft (2) are provided with third installation grooves (16) corresponding to the first installation groove (15) and the second installation groove (18); positioning blocks (8) are arranged within the corresponding first installation groove (15) and third installation groove (16), and within the corresponding second installation groove (18) and third installation groove (16).

2. The high-precision hydraulic control butterfly valve according to claim 1, characterized in that: A first positioning sleeve (14) matching with the positioning block (8) is arranged within the first installation groove (15), a second positioning sleeve (6) matching with the positioning block (8) is arranged within the second installation groove (18), and a third positioning sleeve (7) matching with the positioning block (8) is arranged within the third installation groove (16).

3. A high-precision hydraulic control butterfly valve according to claim 1, characterized in that: It further includes a valve body (4). A bushing (12) is arranged between the valve body (4) and the valve shaft (2). A packing seal assembly for the valve shaft (2) is arranged on one side of the valve body (4) where the crank (1) is located.

4. A high-precision hydraulic control butterfly valve according to claim 3, characterized in that: The packing seal assembly includes a stuffing box (10), a sealing packing (11) is arranged within the stuffing box (10), and a gland (9) for the sealing packing (11) is arranged on the stuffing box (10).

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