Hard sealing type three-connecting-rod butterfly valve for pipeline medium switch control

Abstract

The utility model relates to the technical field of butterfly valves, and discloses a hard sealing type three-connecting-rod butterfly valve used for pipeline medium switch control, which comprises a valve body, a valve seat, an overturning rod, a butterfly plate, a connecting rod and a worm reducer, the valve seat is fixedly arranged on the wall of an inner cavity of the valve body, the butterfly plate is positioned in the inner cavity of the valve seat, and the overturning rod is arranged on the valve seat. A positioning frame is fixedly arranged at the top of an inner cavity of the valve body, a rod body supporting assembly is fixedly arranged at the bottom end of the positioning frame, an overturning rod is transversely arranged in the middle of the inner cavity of the valve body, and a first driving rod assembly and a second driving rod assembly are installed in the middle of the overturning rod. By means of reasonable material selection, the butterfly plate has the advantages of being good in rigidity, resistant to temperature and corrosion, free of abrasion of a sealing face and the like, the service life of the valve is remarkably prolonged, by means of the worm speed reducer, the butterfly plate can have the self-locking capacity and stop at any position, and the operation performance of the valve can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of butterfly valves, in particular to a hard-sealed three-link butterfly valve for pipeline medium switch control. Background Art

[0002] Butterfly valves, also known as flap valves, can be used for on-off control of pipeline media. The butterfly valve opening and closing part is a disc-shaped butterfly plate that rotates around its own axis in the valve body to achieve the purpose of opening, closing or regulating. Butterfly valves are suitable for pipelines that transport various corrosive and non-corrosive fluid media in engineering systems such as generators, coal gas, natural gas, liquefied petroleum gas, city gas, hot and cold air, chemical smelting, power generation and environmental protection, etc., and are used to regulate and cut off the flow of media.

[0003] When the butterfly valve is working, the drive mechanism drives the transmission shaft to rotate, the transmission shaft drives the transmission connecting rod, the transmission connecting rod drives the valve stem, and the valve stem drives the butterfly plate to rotate 0-90 degrees. After the butterfly plate rotates, its edge and the valve seat are sealed or opened. Therefore, the valve is opened and closed by the connecting rod mechanism. However, in the process of opening and closing, the butterfly plate moves in a relatively small arc at the moment of opening and closing, which will interfere with the valve seat. At the same time, there is impact resistance between the sealing pairs, which increases the torque. Therefore, frequent opening and closing can easily cause accelerated wear of the sealing surface, reduced sealing performance, and ultimately lead to valve leakage.

[0004] Furthermore, during operation, when the butterfly valve is in the middle opening, the opening shape formed by the valve body and the front end of the butterfly plate is centered on the valve shaft, and the two sides form different states. The front end of the butterfly plate on one side moves in the direction of the water flow, and the other side moves in the opposite direction of the water flow. Therefore, the valve body and the valve plate on one side form a nozzle-shaped opening, and the other side forms a throttle-shaped opening. The nozzle side has a much faster flow rate than the throttle side, and negative pressure is generated under the valve on the throttle side, which often causes the rubber seal to fall off. Therefore, a new hard-sealed three-link butterfly valve is proposed to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a hard-sealed three-link butterfly valve for pipeline medium switch control to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A hard-sealed three-link butterfly valve for pipeline medium switch control, comprising a valve body, a valve seat, a flip rod, a butterfly plate and a connecting rod and a worm gear reducer, the valve seat is fixed on the inner cavity wall of the valve body, the butterfly plate is located in the inner cavity of the valve seat, a positioning frame is fixedly provided at the top of the inner cavity of the valve body, a rod body support assembly is provided at the bottom end of the positioning frame, a flip rod is horizontally arranged in the middle of the inner cavity of the valve body, a first active rod assembly and a second active rod assembly are installed in the middle of the flip rod, the outer sides of the two active rod assemblies are connected to the positions that contact the flip rod, the inner side of the auxiliary rod assembly is connected to the valve plate connecting assembly, the top of the valve plate connecting assembly is connected to the rod body support assembly through a connecting rod, and one end of the flip rod passes through the side wall of the valve body and is connected to the worm gear reducer.

[0008] As a preferred technical solution of the utility model, the butterfly plate is pressed parallel to the valve seat, and the surface of the valve seat is smooth.

[0009] As a preferred technical solution of the utility model, the valve seat is welded by deep hole welding and plane welding, and the thickness of the Stellite alloy layer is 2-2.5mm and the hardness is 40-25HRc.

[0010] As a preferred technical solution of the utility model, the sealing ring of the butterfly plate adopts a metal ring instead of a rubber ring.

[0011] As a preferred technical solution of the utility model, the valve body and butterfly plate are welded by Q235 or 16Mn, and the flip rod is made of 45# steel or 40Cr shaft.

[0012] As an optimal technical solution of the utility model, a buffer cavity is provided on the bottom side of the inner cavity of the valve body, and the supporting connection between the flip rod and the valve body is replaced by a bearing instead of a copper sleeve hard friction, and the bearing adopts a lead-free, oil-free, self-lubricating structure.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The utility model has the characteristics of good rigidity, temperature resistance, corrosion resistance, no wear on the sealing surface, etc. through reasonable material selection, so that the service life of the valve is significantly extended.

[0015] The utility model uses a scientific design method to significantly reduce the weight of the whole machine, which not only saves materials but also facilitates installation. It is also flexible and convenient to operate, and can realize automatic operation as well as manual operation.

[0016] The utility model adopts a worm gear reducer, which can not only make the butterfly plate have a self-locking ability and stop the butterfly plate at any position, but also improve the operating performance of the valve.

[0017] The utility model butterfly valve with DN300 mm or above can gradually replace the gate valve. Compared with the gate valve, the butterfly valve has the advantages of short opening and closing time, small operating torque, small installation space and light weight. Taking DN1000 as an example, the butterfly valve is about 2T, while the gate valve is about 3.5T. Moreover, the butterfly valve is easy to combine with various drive devices and has good durability and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 It is a schematic diagram of the local structure of the utility model.

[0021] In the figure: 1. valve body; 2. valve seat; 3. butterfly plate; 4. positioning frame; 5. rod body support assembly; 6. flip rod; 7. first active rod assembly; 8. second active rod assembly; 9. auxiliary rod assembly; 10. valve plate connecting assembly; 11. buffer chamber; 12. worm gear reducer; 13. connecting rod. DETAILED DESCRIPTION

[0022] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It should also be noted that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings. The different types of section lines in the drawings in the embodiments of the utility model are not marked according to the national standard, nor are there any requirements for the materials of the components, but are used to distinguish the cross-sectional views of the components in the drawings.

[0023] See also Figure 1-2A hard-sealed three-link butterfly valve for pipeline medium switch control, comprising a valve body 1, a valve seat 2, a flip rod 6, a butterfly plate 3, a connecting rod 13 and a worm reducer 12, the valve seat 2 is fixed on the inner cavity wall of the valve body 1, the butterfly plate 3 is located in the inner cavity of the valve seat 2, a positioning frame 4 is fixed on the top of the inner cavity of the valve body 1, a rod body support assembly 5 is provided at the bottom of the positioning frame 4, a flip rod 6 is horizontally arranged in the middle of the inner cavity of the valve body 1, a first active rod assembly 7 and a second active rod assembly 8 are installed in the middle of the flip rod 6, and the outer sides of the two active rod assemblies are connected to the positions where the flip rod 6 contacts the auxiliary rod assembly 9, and the auxiliary rod assembly The inner side of the component 9 is connected with a valve plate connecting assembly 10, and the top of the valve plate connecting assembly 10 is connected to the rod body supporting assembly 5 through a connecting rod 13. One end of the flip rod 6 passes through the side wall of the valve body 1 and is connected to the worm gear reducer 12. The use of the worm gear reducer 12 can not only make the butterfly plate have self-locking ability and stop the butterfly plate 3 at any position, but also improve the operating performance of the valve, which can be remotely controlled or operated on site. The butterfly valve installation structure adopts a clamping type, and the valve is connected between two pipe flanges by stud bolts. A base is provided at the bottom of the valve body 1, and the vertical support is stable. Two lifting ears are provided on the top, and the lifting is convenient and quick.

[0024] Among them, the butterfly plate 3 is pressed parallel to the valve seat 2, the surface of the valve seat 2 is smooth, and the butterfly plate 3 is deformed to achieve hard sealing. There is no need to use sealing materials such as rubber. The valve body 1 is more resistant to high temperatures. When the valve plate is opened, it is parallel to the flow channel without resistance. The control is simple and convenient, the support is stable, and it is not easy to fall off, which increases the stability of the work.

[0025] Among them, the valve seat 2 adopts deep hole welding and plane welding methods. The thickness of the Stellite alloy layer is 2-2.5mm and the hardness is 40-45HRc. It has good wear resistance and strong abrasion resistance. The service life is comparable to that of imported products and is much longer than an overhaul period.

[0026] Among them, the sealing ring of the butterfly plate 3 adopts a metal ring instead of a rubber ring, which avoids cavitation due to improper use when used for throttling, causing the rubber seat to peel off and be damaged, and the cavitation area is reduced. At the same time, due to a certain hardness difference between the two sealing surfaces, the long life operation of the two sealing pairs and special circumstances during use are better guaranteed.

[0027] Among them, the valve body 1 and the butterfly plate 3 are welded by Q235 or 16Mn, and the flip rod 6 is made of 45# steel or 40Cr shaft, so that the valve is light in weight and has good rigidity; in addition, all valve parts are connected by conductive metal, so that the valve body 1 and the valve stem have conductive continuity, so it has an anti-static function, and the maximum resistance of the discharge path does not exceed 10Ω, thereby ensuring the conductivity of the valve. A long valve cover structure is adopted at the connecting rod end of the valve body 1, and graphite, glass fiber and other fillers are arranged around the connecting rod in the cover, and a combination of hard and soft seals is used to prevent the medium in the valve cavity from leaking out.

[0028] Among them, a buffer chamber 11 is provided on the bottom side of the inner cavity of the valve body 1, which can alleviate the impact of the medium on the components inside the valve during opening and closing, and also helps to reduce the occurrence of cavitation on the butterfly plate 3. The supporting connection between the flip rod 6 and the valve body 1 is changed from copper sleeve hard friction to bearing, and the bearing adopts a lead-free, oil-free self-lubricating structure, which has the characteristics of strong load-bearing capacity, good wear resistance, and low friction resistance.

[0029] The working principle and use process of the utility model: First, through reasonable material selection, it has the characteristics of good rigidity, temperature resistance, corrosion resistance, and no wear on the sealing surface, so that the service life of the valve is significantly extended. Through scientific design methods, the weight of the whole machine is significantly reduced, which not only saves materials but also facilitates installation. And the operation is flexible and convenient, which can realize automatic operation and manual operation. By adopting the worm gear reducer 12, not only can the butterfly plate have self-locking ability, so that the butterfly plate 3 stops at any position, but also improves the operating performance of the valve. The butterfly valve above DN300 mm can gradually replace the gate valve. Compared with the gate valve, the butterfly valve has short opening and closing time, small operating torque, small installation space and light weight. Taking DN1000 as an example, the butterfly valve is about 2T, while the gate valve is about 3.5T. The butterfly valve is easy to combine with various drive devices and has good durability and reliability. The content not described in detail in this description belongs to the existing technology known to professional and technical personnel in this field.

[0030] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.

Claims

1. A hard-sealed three-link butterfly valve for on-off control of pipeline media, comprising a valve body (1), a valve seat (2), a flip rod (6), a butterfly plate (3), a connecting rod (13) and a worm gear reducer (12), characterized in that: The valve seat (2) is fixedly arranged on the inner cavity wall of the valve body (1); the butterfly plate (3) is located in the inner cavity of the valve seat (2); a positioning frame (4) is fixedly arranged on the top of the inner cavity of the valve body (1); a rod body support assembly (5) is arranged at the bottom end of the positioning frame (4); a flip rod (6) is transversely arranged in the middle of the inner cavity of the valve body (1); a first active rod assembly (7) and a second active rod assembly (8) are installed in the middle of the flip rod (6); auxiliary rod assemblies (9) are connected to the outer sides of the two active rod assemblies at positions in contact with the flip rod (6); a valve plate connecting assembly (10) is connected to the inner side of the auxiliary rod assembly (9); the top of the valve plate connecting assembly (10) is connected to the rod body support assembly (5) via a connecting rod (13); one end of the flip rod (6) passes through the side wall of the valve body (1) and is connected to a worm gear reducer (12).

2. A hard-sealed three-link butterfly valve for pipeline medium switch control according to claim 1, characterized in that: The butterfly plate (3) is pressed parallel to the valve seat (2), and the surface of the valve seat (2) is smooth.

3. A hard-sealed three-link butterfly valve for pipeline medium switch control according to claim 1, characterized in that: The valve seat (2) is welded by deep hole welding and plane welding, and the Stellite alloy layer has a thickness of 2-2.5 mm and a hardness of 40-45 HRc.

4. A hard-sealed three-link butterfly valve for pipeline medium switch control according to claim 1, characterized in that: The sealing ring of the butterfly plate (3) adopts a metal ring instead of a rubber ring.

5. A hard-sealed three-link butterfly valve for pipeline medium switch control according to claim 1, characterized in that: The valve body (1) and butterfly plate (3) are made of Q235 welding or 16Mn welding, and the flip rod (6) is made of 45# steel or 40Cr shaft.

6. A hard-sealed three-link butterfly valve for pipeline medium switch control according to claim 1, characterized in that: A buffer cavity (11) is provided on the bottom side of the inner cavity of the valve body (1); the supporting connection between the flip rod (6) and the valve body (1) is replaced by a bearing instead of a copper sleeve hard friction, and the bearing adopts a lead-free, oil-free, self-lubricating structure.

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