Percentage butterfly valve and its control method

Abstract

The percentage butterfly valve and its control method belong to the field of butterfly valve technology, and specifically relate to a percentage butterfly valve and its control method. The present invention provides a butterfly valve that can be adjusted in approximate percentage. The percentage butterfly valve of the present invention includes a valve body, which is characterized in that: the first valve plate, the second valve plate, the third valve plate and the fourth valve plate are arranged in sequence from top to bottom in the valve body, and the first control cylinder, the second control cylinder and the third control cylinder are arranged on the side of the valve body, the first control cylinder is connected to the first axis of the first valve plate; the second control cylinder is connected to the third axis of the third valve plate; the third control cylinder is connected to the second valve plate and the fourth valve plate through a synchronous linkage component.

Description

Technical Field

[0001] The invention belongs to the technical field of butterfly valves, and in particular relates to a percentage butterfly valve and a control method thereof. Background Art

[0002] Traditional butterfly valve structure Fig. 9 As shown, it includes a valve body 100 , a valve plate 200 , a valve shaft 300 , a positioning pin 400 , a hydraulic regulating control device 500 , a valve position feedback positioner 600 , a valve body sealing seat 700 , and a sealing ring 800 .

[0003] The working principle is as follows: the hydraulic regulating control device 500 of the valve drives the valve plate 200 to rotate within a range of 90° relative to the valve body 100 through the valve shaft 300 and the positioning pin 400, thereby realizing full-stroke adjustment of the valve from fully closed to fully open.

[0004] The traditional regulating butterfly valve has the following shortcomings: 1. The regulating linearity of the valve in the full opening range is very poor, and the flow rate changes sharply when the valve is opened within the range of 0 to 30 degrees. Fig.10 As shown, the flow rate of the valve changes slightly within the range of 30 to 90°.

[0005] 2. Because the flow rate changes sharply when the valve is operated at a small opening within the range of 0-30° and is prone to harmful factors such as noise, vibration, cavitation, etc. The overall service life of the valve is greatly reduced when it is operated at a small opening for a long time.

[0006] 2. The valve has large torque during the switching process. Summary of the invention

[0007] The present invention aims at the above-mentioned problem and provides a butterfly valve with approximate percentage regulation and a control method thereof.

[0008] In order to achieve the above-mentioned purpose of the present invention, the present invention adopts the following technical scheme. The percentage butterfly valve of the present invention includes a valve body, which is characterized in that: a first valve plate, a second valve plate, a third valve plate and a fourth valve plate are arranged in sequence from top to bottom in the valve body, and a first control cylinder, a second control cylinder and a third control cylinder are arranged on the side of the valve body, the first control cylinder is connected to the first axis of the first valve plate; the second control cylinder is connected to the third axis of the third valve plate; the third control cylinder is connected to the second valve plate and the fourth valve plate through a synchronous linkage component.

[0009] As a preferred solution of the present invention, energy dissipation flow ribs are provided on the surfaces of the first valve plate and the fourth valve plate.

[0010] Further, the cross-sections of the first valve plate and the fourth valve plate are both rhombus-shaped, and the rhombus is formed by a first side, a second side, a third side and a fourth side. The first side of the first valve plate is provided with an overlapping side that cooperates with the valve body, and the third side of the first valve plate is provided with an overlapping side that cooperates with the second valve plate; the energy dissipation flow ribs are provided on the first side and the third side of the first valve plate; one side of the energy dissipation flow rib is a straight side, and the other side is an arcuate side, the arcuate side corresponds to one side of the overlapping side, and the straight side corresponds to the second side or the fourth side of the first valve plate; the first side of the fourth valve plate is provided with an overlapping side that cooperates with the third valve plate, and the third side of the fourth valve plate is provided with an overlapping side that cooperates with the valve body; the energy dissipation flow ribs are provided on the second side and the fourth side of the fourth valve plate; the arcuate side of the energy dissipation flow rib corresponds to one side of the overlapping side, and the straight side corresponds to the first side or the third side of the fourth valve plate.

[0011] As another preferred scheme of the present invention, the synchronous linkage assembly includes a first rocker arm having one end connected to the third control cylinder, and the middle part of the first rocker arm is connected to the fourth axis of the fourth valve plate; the other end of the first rocker arm is connected to one end of a connecting rod; the other end of the connecting rod is connected to one end of the second rocker arm, and the other end of the second rocker arm is connected to the second axis of the second valve plate.

[0012] The control method of the percentage butterfly valve of the present invention is characterized by comprising: an initial stage, a second stage and a third stage:

[0013] Initial stage: The first valve plate starts to work, and the first control cylinder drives the first valve plate to rotate and open.

[0014] The second stage: when the first valve plate is opened 40-60°, the third valve plate is put into operation under the control of the second control cylinder. The third valve plate is put into operation to supplement the first valve plate in time when it is opened 40-60° to adjust the flow decline and shortage.

[0015] The third stage: when the first valve plate is fully open and the third valve plate is opened 40-60°, the second valve plate and the fourth valve plate are put into operation under the action of the third control cylinder and the synchronous linkage assembly. In this stage, the second valve plate and the fourth valve plate are put into operation to supplement the first valve plate and the third valve plate in time when they are opened 40-60° to adjust the flow decline and shortage.

[0016] Beneficial effects of the present invention:

[0017] 1. The present invention can adjust each valve plate by partial differential adjustment, thereby overcoming the shortcoming of very poor adjustment linearity of the traditional rainbow butterfly valve within the full opening range, and realizing approximately equal percentage adjustment within the full stroke range of the butterfly valve.

[0018] The present invention can realize stable flow regulation at small opening.

[0019] The present invention overcomes the problems of rapid flow change and easy noise, vibration, cavitation and other problems of traditional butterfly valves under small opening by using energy dissipation flow ribs, thus greatly improving the overall service life of the valve.

[0020] The present invention has small torque during the switching process and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention.

[0022] Figure 2 yes Figure 1 Right view of .

[0023] Figure 3 yes Figure 1 Left view of .

[0024] Figure 4 It is a structural schematic diagram when the first valve plate is put into operation.

[0025] Figure 5 It is a structural diagram of the third valve plate when it is put into operation.

[0026] Figure 6 It is a schematic diagram of the structure when the second valve plate and the fourth valve plate are put into operation.

[0027] Figure 7 It is a structural schematic diagram of the present invention when it is fully opened.

[0028] Figure 8 yes Figure 4 A partial enlarged view of .

[0029] Fig. 9 It is a structural diagram of a traditional butterfly valve.

[0030] Fig.10 This is a diagram of the usage status of a traditional butterfly valve.

[0031] In the accompanying drawings, 1 is the valve body, 2 is the first valve plate, 3 is the second valve plate, 4 is the third control cylinder, 5 is the third valve plate, 6 is the synchronous linkage assembly, 7 is the fourth valve plate, 8 is the energy dissipation flow rib, 9 is the second rocker, 10 is the first rocker, 11 is the first axis, 12 is the second axis, 13 is the third axis, 14 is the fourth axis, 15 is the connecting rod, 16 is the swing arm, 17 is the first control cylinder, 18 is the second control cylinder, 19 is the overlapping edge, 20 is the arc edge, 21 is the first edge, 22 is the second edge, 23 is the third edge, 24 is the fourth edge, and 25 is the straight edge. DETAILED DESCRIPTION

[0032] The present invention includes a valve body 1, which is characterized in that: a first valve plate 2, a second valve plate 3, a third valve plate 5 and a fourth valve plate 7 are arranged in sequence from top to bottom in the valve body 1, and a first control cylinder 17, a second control cylinder 18 and a third control cylinder 4 are arranged on the side of the valve body 1, the first control cylinder 17 is connected to the first axis 11 of the first valve plate 2; the second control cylinder 18 is connected to the third axis 13 of the third valve plate 5; the third control cylinder 4 is connected to the second valve plate 3 and the fourth valve plate 7 through a synchronous linkage component 6.

[0033] As a preferred solution of the present invention, energy dissipation flow ribs 8 are provided on the surfaces of the first valve plate 2 and the fourth valve plate 7 .

[0034] Further, the cross-sections of the first valve plate 2 and the fourth valve plate 7 are both rhombus-shaped, and the rhombus is surrounded by a first side 21, a second side 22, a third side 23 and a fourth side. The first side 21 of the first valve plate 2 is provided with an overlapped side 19 that matches the valve body 1, and the third side 23 of the first valve plate 2 is provided with an overlapped side 19 that matches the second valve plate 3; the energy dissipation rib 8 is provided on the first side 21 and the third side 23 of the first valve plate 2; one side of the energy dissipation rib 8 is a straight side 25, and the other side is an arcuate side 20, and the arcuate side 21 is provided with an overlapped side 19 that matches the second valve plate 3. The edge 20 corresponds to one side of the overlapping edge 19, and the straight edge 25 corresponds to the second edge 22 or the fourth edge of the first valve plate 2; the first edge 21 of the fourth valve plate 7 is provided with an overlapping edge 19 that cooperates with the third valve plate 5, and the third edge 23 of the fourth valve plate 7 is provided with an overlapping edge 19 that cooperates with the valve body 1; the energy dissipation rib 8 is provided on the second edge 22 and the fourth edge of the fourth valve plate 7; the arcuate edge 20 of the energy dissipation rib 8 corresponds to one side of the overlapping edge 19, and the straight edge 25 corresponds to the first edge 21 or the third edge 23 of the fourth valve plate 7.

[0035] As another preferred scheme of the present invention, the synchronous linkage assembly 6 includes a first rocker arm 10 connected to the third control cylinder 4 at one end, and the middle part of the first rocker arm 10 is connected to the fourth axis 14 of the fourth valve plate 7; the other end of the first rocker arm 10 is connected to one end of a connecting rod 15; the other end of the connecting rod 15 is connected to one end of the second rocker arm 9, and the other end of the second rocker arm 9 is connected to the second axis 12 of the second valve plate 3.

[0036] The first control cylinder 17 and the first shaft 11 of the first valve plate 2 , as well as the second control cylinder 18 and the third shaft 13 are connected via a swing arm 16 .

[0037] Working principle of the present invention: In the initial stage of opening, the first valve plate 2 starts to work. At this time, the first control cylinder 17 drives the swing arm 16 to swing, and the swing arm 16 drives the first valve plate 2 to rotate and open through the first shaft 11. Figure 4As shown, at this time, the multiple energy dissipation flow ribs 8 on the first valve plate 2 can effectively improve the flow state of the medium when the first valve plate 2 is operating at a small opening, and eliminate adverse factors such as noise, vibration cavitation, etc.

[0038] The second stage of valve opening: after the first valve plate 2 is opened 40-60°, the third valve plate 5 is put into operation under the control of the second control cylinder 18. In this stage, the third valve plate 5 is put into operation to timely supplement the first valve plate 2 when it is opened 40-60°, and adjust the flow rate to decline and be insufficient, so that the flow rate regulation of the present invention in this stage is basically maintained on an equal percentage linear basis, such as Figure 5 shown.

[0039] The third stage of valve opening: when the first valve plate 2 is fully opened and the third valve plate 5 is opened 40-60°, the second valve plate 3 and the fourth valve plate 7 are put into operation under the action of the third control oil cylinder 4 and the synchronous linkage component 6. In this stage, the second valve plate 3 and the fourth valve plate 7 are put into operation to timely supplement the first valve plate 2 and the third valve plate 5 when they are opened 40-60°, and adjust the flow rate to decline and be insufficient, so that the flow rate regulation of the valve in the final stage of opening is basically maintained on an equal percentage linear basis, such as Figure 6 , Figure 7 shown.

[0040] It can be understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that the present invention can still be modified or replaced by equivalents to achieve the same technical effects; as long as the use requirements are met, they are within the protection scope of the present invention.

Claims

1. A percentage butterfly valve, comprising a valve body (1), characterized in that: A first valve plate (2), a second valve plate (3), a third valve plate (5) and a fourth valve plate (7) are arranged in sequence from top to bottom in the valve body (1); a first control oil cylinder (17), a second control oil cylinder (18) and a third control oil cylinder (4) are arranged on the side of the valve body (1); the first control oil cylinder (17) is connected to the first shaft (11) of the first valve plate (2); the second control oil cylinder (18) is connected to the third shaft (13) of the third valve plate (5); the third control oil cylinder (4) is connected to the second valve plate (3) and the fourth valve plate (7) via a synchronous linkage component (6); Energy dissipation flow ribs (8) are provided on the surfaces of the first valve plate (2) and the fourth valve plate (7); the cross-sections of the first valve plate (2) and the fourth valve plate (7) are both rhombus-shaped, and the rhombus is formed by a first side (21), a second side (22), a third side (23) and a fourth side; the first side (21) of the first valve plate (2) is provided with an overlapping side (19) that matches the valve body (1), and the third side (23) of the first valve plate (2) is provided with an overlapping side (19) that matches the second valve plate (3); the energy dissipation flow ribs (8) are provided on the first side (21) and the third side (23) of the first valve plate (2); one side of the energy dissipation flow ribs (8) is a straight side (25), and the other side is The arcuate edge (20) corresponds to one side of the overlapping edge (19), and the straight edge (25) corresponds to the second edge (22) or the fourth edge of the first valve plate (2); the first edge (21) of the fourth valve plate (7) is provided with an overlapping edge (19) that matches the third valve plate (5), and the third edge (23) of the fourth valve plate (7) is provided with an overlapping edge (19) that matches the valve body (1); the energy dissipation rib (8) is provided on the second edge (22) and the fourth edge of the fourth valve plate (7); the arcuate edge (20) of the energy dissipation rib (8) corresponds to one side of the overlapping edge (19), and the straight edge (25) corresponds to the first edge (21) or the third edge (23) of the fourth valve plate (7); The synchronous linkage assembly (6) comprises a first rocker arm (10) having one end connected to the third control oil cylinder (4); the middle part of the first rocker arm (10) is connected to the fourth shaft (14) of the fourth valve plate (7); the other end of the first rocker arm (10) is connected to one end of a connecting rod (15); the other end of the connecting rod (15) is connected to one end of the second rocker arm (9); the other end of the second rocker arm (9) is connected to the second shaft (12) of the second valve plate (3).

2. The percentage butterfly valve according to claim 1, characterized in that: The first control oil cylinder (17) and the first shaft (11) of the first valve plate (2), as well as the second control oil cylinder (18) and the third shaft (13) are connected via a swing arm (16).

3. The control method of percentage butterfly valve according to claim 1, characterized in that: include: initial, second and third phases; Initial stage: the first valve plate (2) starts to work, at which time the first control oil cylinder (17) drives the first valve plate (2) to rotate and open; The second stage: when the first valve plate (2) is opened by 40 to 60 degrees, the third valve plate (5) is put into operation under the control of the second control oil cylinder (18), and the third valve plate (5) is put into operation to timely supplement the first valve plate (2) when it is opened by 40 to 60 degrees, so as to adjust the flow rate decline and shortage; The third stage: when the first valve plate (2) is fully opened and the third valve plate (5) is opened by 40 to 60 degrees, the second valve plate (3) and the fourth valve plate (7) are put into operation under the action of the third control oil cylinder (4) in cooperation with the synchronous linkage component (6). In this stage, the second valve plate (3) and the fourth valve plate (7) are put into operation to timely supplement the first valve plate (2) and the third valve plate (5) when they are opened by 40 to 60 degrees, so as to adjust the flow rate to decline and be insufficient.

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