Double-butterfly-plate leakage valve with double-ring gap

Abstract

According to the double-butterfly-plate leakage valve with the double-ring gap, the first ring gap is formed between the large butterfly plate and the medium flow channel, the second ring gap is formed between the small butterfly plate and the medium adjusting through hole, and the accuracy of flow control is further improved through the structure of the double-ring gap; by means of the design, resistance borne by media in the circulation process is smaller, and the circulation performance of the valve can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a double butterfly plate leakage valve with double ring gaps. Background Art

[0002] The large butterfly plate of the valve body is a sealing structure, and the small butterfly plate is a leaky valve. When the valve is fully closed, the leakage of the small butterfly plate ring gap meets the minimum flow requirement of the system. It is well known that there are deviations in the design and processing of each component, and a small deviation has a great impact on the fluctuation of the minimum flow. Therefore, the ring gap between the small butterfly plate and the large butterfly plate cannot meet the minimum flow requirement. Summary of the invention

[0003] In view of this, the utility model provides a double butterfly plate leakage valve with double ring gaps.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A double butterfly plate leakage valve with double ring gaps comprises a valve body, a medium flow channel is provided on the valve body, a large butterfly plate is arranged in the medium flow channel, a first ring gap is provided between the large butterfly plate and the inner wall of the medium flow channel, a medium regulating through hole is provided on the large butterfly plate, a small butterfly plate is arranged in the medium regulating through hole, and a second ring gap is provided between the small butterfly plate and the medium regulating through hole.

[0006] Preferably, the small butterfly plate has an arc-shaped guide portion, and the arc-shaped guide portion is arranged on the outer ring of the small butterfly plate.

[0007] Preferably, a valve stem is arranged on the valve body, and the valve stem comprises a main valve stem for controlling the opening and closing of the large butterfly plate and an auxiliary valve stem for controlling the opening and closing of the small butterfly plate, and the main valve stem and the auxiliary valve stem are arranged in a coaxial structure.

[0008] Preferably, a transmission groove and a rotation connecting hole are provided on the small butterfly plate, the rotation connecting hole and the transmission groove are communicated, one end of the auxiliary valve stem passes through the transmission groove and is connected to the main valve stem, a positioning hole is provided on the auxiliary valve stem corresponding to the rotation connecting hole, a positioning pin is provided between the rotation connecting hole and the positioning hole, and the small butterfly plate and the auxiliary valve stem are connected and fixed by the positioning pin.

[0009] Preferably, a valve stem fixing groove is provided on the large butterfly plate, and the main valve stem includes an upper valve stem and a lower valve stem, and the upper valve stem and the lower valve stem are respectively extended into the valve stem fixing groove by two ends of the large butterfly plate to be connected to the large butterfly plate, and a lower valve stem connecting groove is provided on the lower valve stem, and one end of the auxiliary valve stem passes through the lower valve stem connecting groove and the large butterfly plate in sequence to be connected to the main valve stem.

[0010] Preferably, a main valve stem actuator is arranged at the top end of the main valve stem, and the main valve stem actuator includes a spring cylinder, an oil cylinder and a fork transmission box, the fork transmission box is connected to the main valve stem, the spring cylinder and the oil cylinder are respectively arranged on both sides of the fork transmission box, and the spring cylinder and the oil cylinder extend into the fork transmission box to drive the main valve stem to rotate.

[0011] Preferably, a fork assembly is arranged in the fork transmission box, the top end of the main valve stem extends into the fork transmission box and is connected to the fork assembly, the fork assembly includes a fork member and a linkage member, the fork member is arranged on one end of the main valve stem extending into the inner cavity, one side of the fork member extends to form a transmission part, a transmission groove is arranged on the transmission part, the linkage member extends into the transmission groove and is connected to the fork member, and the oil cylinder and the spring cylinder are respectively connected to two sides of the linkage member.

[0012] The beneficial effect of the utility model is that by setting a first ring gap between the large butterfly plate and the medium flow channel, and setting a second ring gap between the small butterfly plate and the medium adjustment hole, the accuracy of flow control is further improved through the double ring gap structure. At the same time, this design also makes the resistance encountered by the medium during the circulation process smaller, which is beneficial to improving the circulation performance of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Attached Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Attached Figure 2 This is a schematic diagram of the small butterfly plate and the large butterfly plate being fully closed;

[0016] Attached Figure 3 It is a cross-sectional view of the utility model;

[0017] Attached Figure 4 This is a schematic diagram of the interior of the fork box. DETAILED DESCRIPTION

[0018] 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.

[0019] The utility model will be further described below in conjunction with the accompanying drawings of the specification.

[0020] The utility model provides the following technical solutions:

[0021] As attached Figure 1-4 As shown, the utility model discloses a double butterfly plate leakage valve with double ring gaps, including a valve body 1, a medium flow channel 3 is provided on the valve body 1, a large butterfly plate 4 is arranged in the medium flow channel 3, a first ring gap 5 is provided between the large butterfly plate 4 and the inner wall of the medium flow channel 3, a medium adjustment through hole 6 is provided on the large butterfly plate 4, a small butterfly plate 7 is arranged in the medium adjustment through hole 6, and a second ring gap 8 is provided between the small butterfly plate 7 and the medium adjustment through hole 6. Specifically, in this design, by providing the first ring gap 5 between the large butterfly plate 4 and the medium flow channel 3, and providing the second ring gap 8 between the small butterfly plate 7 and the medium adjustment through hole 6, the accuracy of flow control is further improved through the structure of the double ring gaps. At the same time, this design also makes the resistance to the medium in the flow process smaller, which is conducive to improving the flow performance of the valve.

[0022] Furthermore, the small butterfly plate 7 has an arc-shaped flow guide 9, and the arc-shaped flow guide 9 is arranged on the outer ring of the small butterfly plate 7. Specifically, in the present embodiment, the arc-shaped flow guide 9 of the small butterfly plate 7 is arranged between the two end faces of the small butterfly plate 7 in an annular structure. The arrangement of the arc-shaped flow guide 9 further optimizes the flow path of the medium, reduces the turbulence and eddy flow of the fluid inside the valve, thereby reducing the wear and impact of the fluid on the valve and improving the service life of the valve. At the same time, the design of the arc-shaped flow guide 9 also makes the medium smoother when passing through the small butterfly plate 7, effectively reduces the resistance of the medium, and further improves the flow performance of the valve.

[0023] Furthermore, a valve stem is provided on the valve body 1, and the valve stem includes a main valve stem 10 for controlling the opening and closing of the large butterfly plate 4 and an auxiliary valve stem 11 for controlling the opening and closing of the small butterfly plate 7, and the main valve stem 10 and the auxiliary valve stem 11 are arranged in a coaxial structure. Specifically, in this embodiment, the main valve stem 10 is used to control the opening and closing of the large butterfly plate 4, and the auxiliary valve stem 11 is used to control the opening and closing of the small butterfly plate 7. This coaxial structure design makes the operation of the two butterfly plates more coordinated, and improves the working efficiency and stability of the valve.

[0024] Furthermore, a transmission slot 12 and a rotation connection hole (not shown) are provided on the small butterfly plate 7, the rotation connection hole is connected to the transmission slot 12, one end of the auxiliary valve stem 11 passes through the transmission slot 12 and is connected to the main valve stem 10, a positioning hole 14 is provided on the auxiliary valve stem 11 corresponding to the rotation connection hole, a positioning pin 15 is provided between the rotation connection hole and the positioning hole 14, and the small butterfly plate 7 and the auxiliary valve stem 11 are connected and fixed by the positioning pin 15. Specifically, in this embodiment, the design of the rotation connection hole and the transmission slot 12 enables the small butterfly plate 7 to rotate relative to the auxiliary valve stem 11, thereby realizing the switch control of the valve. At the same time, the setting of the positioning hole 14 and the positioning pin 15 ensures the stability and accuracy of the small butterfly plate 7 during the rotation process, and prevents malfunctions caused by vibration or impact.

[0025] Furthermore, a valve stem fixing groove 16 is opened on the large butterfly plate 4, and the main valve stem 10 includes an upper valve stem 17 and a lower valve stem 18, and the upper valve stem 17 and the lower valve stem 18 are respectively extended into the valve stem fixing groove 16 by the two ends of the large butterfly plate 4 and connected with the large butterfly plate 4, and a lower valve stem connecting groove 19 is opened on the lower valve stem 18, and one end of the auxiliary valve stem 11 passes through the lower valve stem connecting groove 19 and the large butterfly plate 4 in sequence to be connected with the main valve stem 10.

[0026] Furthermore, a main valve stem actuator 20 is arranged at the top of the main valve stem 10, and the main valve stem actuator 20 includes a spring cylinder 21, an oil cylinder 22 and a fork transmission box 23. The fork transmission box 23 is connected to the main valve stem 10, and the spring cylinder 21 and the oil cylinder 22 are arranged on both sides of the fork transmission box 23, respectively. The spring cylinder 21 and the oil cylinder 22 extend into the fork transmission box 23 to drive the main valve stem 10 to rotate. Specifically, in this embodiment, the oil cylinder 22 and the spring cylinder 21 serve as the power source of the main valve stem actuator 20. By respectively arranging the oil cylinder 22 and the spring cylinder 21 on both sides of the valve stem transmission assembly, the action force of the spring in the spring cylinder 21 and the action force of the oil cylinder 22 are used to realize the opening and closing of the valve. When the spring in the spring cylinder 21 fails or fails, the valve can also be opened by the oil cylinder 22 to ensure that the valve can operate normally.

[0027] Further, a fork assembly is arranged in the fork transmission box 23, the top end of the main valve stem 10 extends into the fork transmission box 23 and is connected to the fork assembly, the fork assembly includes a fork member 24 and a linkage member 25, the fork member 24 is arranged on one end of the main valve stem 10 extending into the inner cavity, one side of the fork member 24 extends to form a transmission part 26, a transmission groove 27 is arranged on the transmission part 26, the linkage member 25 extends into the transmission groove 27 and is connected to the fork member 24, and the oil cylinder 22 and the spring cylinder 21 are respectively connected to the two sides of the linkage member 25. Specifically, in this embodiment, the fork assembly is a key part of the main valve stem actuator 20, and the oil cylinder 22 and the spring cylinder 21 drive the main valve stem 10 through the coordinated action of the fork member 24 and the linkage member 25. The fork member 24 is directly connected to the main valve stem 10, and is connected to the linkage member 25 through the transmission groove 27 on the transmission part 26, so that the power of the oil cylinder 22 and the spring cylinder 21 can be accurately transmitted to the fork member 24 through the linkage member 25, and then transmitted to the main valve stem 10 by the fork member 24, thereby realizing accurate control of the large butterfly plate 4.

[0028] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A double butterfly disc leakage valve with double ring gaps, comprising a valve body, characterized in that: A medium flow channel is provided on the valve body, a large butterfly plate is arranged in the medium flow channel, a first ring gap is provided between the large butterfly plate and the inner wall of the medium flow channel, a medium regulating through hole is provided on the large butterfly plate, a small butterfly plate is arranged in the medium regulating through hole, and a second ring gap is provided between the small butterfly plate and the medium regulating through hole.

2. The double butterfly disc leakage valve with double ring gap according to claim 1, characterized in that: The small butterfly plate has an arc-shaped flow guide portion, and the arc-shaped flow guide portion is arranged on the outer circle of the small butterfly plate.

3. The double butterfly disc leakage valve with double ring gap according to claim 1, characterized in that: A valve stem is arranged on the valve body, and the valve stem comprises a main valve stem for controlling the opening and closing of a large butterfly plate and an auxiliary valve stem for controlling the opening and closing of a small butterfly plate, and the main valve stem and the auxiliary valve stem are arranged in a coaxial structure.

4. The double butterfly disc leakage valve with double ring gap according to claim 3 is characterized in that: A transmission groove and a rotation connection hole are provided on the small butterfly plate, the rotation connection hole and the transmission groove are communicated, one end of the auxiliary valve stem passes through the transmission groove and is connected to the main valve stem, a positioning hole is provided on the auxiliary valve stem corresponding to the rotation connection hole, a positioning pin is provided between the rotation connection hole and the positioning hole, and the small butterfly plate and the auxiliary valve stem are connected and fixed by the positioning pin.

5. The double butterfly disc leakage valve with double ring gap according to claim 3, characterized in that: A valve stem fixing groove is provided on the large butterfly plate, and the main valve stem includes an upper valve stem and a lower valve stem, and the upper valve stem and the lower valve stem are respectively extended into the valve stem fixing groove from two ends of the large butterfly plate and connected with the large butterfly plate, and a lower valve stem connecting groove is provided on the lower valve stem, and one end of the auxiliary valve stem passes through the lower valve stem connecting groove and the large butterfly plate in sequence to be connected with the main valve stem.

6. The double butterfly disc leakage valve with double ring gap according to claim 3, characterized in that: A main valve stem actuator is arranged at the top end of the main valve stem, and the main valve stem actuator includes a spring cylinder, an oil cylinder and a fork transmission box. The fork transmission box is connected to the main valve stem, and the spring cylinder and the oil cylinder are respectively arranged on both sides of the fork transmission box. The spring cylinder and the oil cylinder extend into the fork transmission box to drive the main valve stem to rotate.

7. The double butterfly disc leakage valve with double ring gap according to claim 6, characterized in that: A fork assembly is arranged in the fork transmission box, the top end of the main valve stem extends into the fork transmission box and is connected to the fork assembly, the fork assembly includes a fork member and a linkage member, the fork member is arranged on one end of the main valve stem extending into the inner cavity, one side of the fork member extends to form a transmission part, a transmission groove is arranged on the transmission part, the linkage member extends into the transmission groove and is connected to the fork member, and the oil cylinder and the spring cylinder are respectively connected to the two sides of the linkage member.

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