Anti-backflow electric butterfly valve

Abstract

The utility model discloses an anti-backflow electric butterfly valve which comprises a valve body, a butterfly plate is rotationally connected in the valve body, a valve shaft penetrating through the valve body and extending out of the valve body is fixedly connected to the upper surface of the butterfly plate, and a hinge plate is hinged to the face, away from the input end, of the butterfly plate and the side, opposite to the rotating direction of the butterfly plate, of the butterfly plate. A telescopic piece is hinged to the face, facing the butterfly plate, of the hinged plate, and the end, away from the hinged plate, of the telescopic piece is hinged to the butterfly plate. The hinge plate is hinged to the side, away from the input end, of the butterfly plate and the side, opposite to the rotating direction of the butterfly plate, of the butterfly plate, the telescopic structure composed of the movable rod, the pipe sleeve and the elastic piece is hinged between the hinge plate and the butterfly plate, and the telescopic structure abuts against the hinge plate so that the hinge plate can not make direct contact with the butterfly plate. When the butterfly plate is opened, the hinged plate can make contact with the inner surface of the valve body under impact of liquid at the output end, and therefore backflow of the liquid at the output end is prevented.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of butterfly valves, in particular to an anti-backflow electric butterfly valve. Background Art

[0002] The butterfly valve, also known as the flap valve, is mainly composed of five parts: valve body, butterfly plate, valve shaft, valve seat and drive device. It is a simple-structured regulating valve that can be used for the on-off control of low-pressure pipeline media.

[0003] When the butterfly valve is turned and opened, pressure imbalance will occur on both sides. The pressure on the side with a larger opening is high, and the liquid at the input end passes through. However, the pressure on the side with a smaller opening is low, and the liquid at the output end can easily flow back into the input end. Therefore, an anti-backflow electric butterfly valve is needed. Utility Model Content

[0004] The technical solution of the utility model is aimed at the technical problem that the existing technical solution is too single, and provides a solution that is significantly different from the existing technology. It mainly provides an anti-backflow electric butterfly valve to solve the technical problem proposed in the above background technology that the liquid at the output end of the butterfly valve is easy to flow back into the input end at the moment of turning to open.

[0005] The technical solution adopted by the utility model to solve the above technical problems is:

[0006] An anti-backflow electric butterfly valve comprises a valve body, to which a butterfly plate is rotatably connected, the upper surface of the butterfly plate is connected and fixed with a valve shaft that passes through the valve body and extends outside the valve body, a hinged plate is hinged on a side of the butterfly plate that is away from the input end and opposite to the rotation direction of the butterfly plate, a telescopic part is hinged on a side of the hinged plate that faces the butterfly plate, and the end of the telescopic part that is away from the hinged plate is hinged to the butterfly plate.

[0007] Preferably, the telescopic member includes a pipe sleeve, the pipe sleeve is hinged on the side of the butterfly plate facing the hinged plate, a movable rod is inserted into the end of the pipe sleeve away from the butterfly plate, the end of the movable rod away from the pipe sleeve is hinged to the hinged plate, one end of the movable rod in the pipe sleeve is connected and fixed with an elastic member, and the end of the elastic member away from the movable rod is connected and fixed to the pipe sleeve.

[0008] Preferably, a sealing ring is connected and fixed to the annular surface of the butterfly plate, and the sealing ring is in rotational contact with the inner surface of the valve body.

[0009] Compared with the prior art, the beneficial effects of the utility model are:

[0010] By hingedly connecting a hinged plate on the side of the butterfly plate away from the input end and opposite to the rotation direction of the butterfly plate, and then hingedly connecting a telescopic structure composed of a movable rod, a pipe sleeve and an elastic member between the hinged plate and the butterfly plate, the telescopic structure is used to support the hinged plate so that the hinged plate will not directly contact the butterfly plate. When the butterfly plate is opened, the hinged plate contacts the inner surface of the valve body under the impact of the liquid at the output end, thereby preventing the liquid at the output end from flowing back.

[0011] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a top view of the butterfly plate of the utility model when it is closed;

[0013] Figure 2 It is a top view of the butterfly plate of the utility model during the punching process;

[0014] Figure 3 It is a top view of the butterfly plate of the utility model when it is fully opened.

[0015] 1. Valve body; 2. Sealing ring; 3. Butterfly plate; 4. Valve shaft; 5. Elastic part; 6. Pipe sleeve; 7. Movable rod; 8. Hinge plate. DETAILED DESCRIPTION

[0016] In order to facilitate the understanding of the present invention, the present invention will be described in more detail below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0017] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly connected by technicians in the technical field of the present invention. The terminology used in the specification of the present invention is for the purpose of describing specific embodiments and is not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0019] Please refer to the attached Figure 1-3A backflow prevention electric butterfly valve comprises a valve body 1, a butterfly plate 3 is rotatably connected in the valve body 1, the upper surface of the butterfly plate 3 is connected to a fixed valve shaft 4, the valve shaft 4 passes through the valve body 1 and extends outside the valve body 1, a hinged plate 8 is hinged on the side of the butterfly plate 3 away from the input end, the hinged plate 8 is hinged on the side close to the input end after the butterfly plate 3 rotates, the hinged plate 8 is made of rubber and can maintain close contact with the inner wall of the valve body 1, a movable rod 7 is hinged on the side of the hinged plate 8 facing the butterfly plate 3, a pipe sleeve 6 is hinged on the side of the butterfly plate 3 facing the hinged plate 8, the end of the movable rod 7 away from the hinged plate 8 is inserted in the pipe sleeve 6, the end of the movable rod 7 in the pipe sleeve 6 is connected to a fixed elastic member 5, the elastic member 5 is a spring, the elastic member 5 is in a normal state, and the end of the elastic member 5 away from the movable rod 7 is connected and fixed to the pipe sleeve 6.

[0020] In order to increase the sealing performance of the butterfly plate 3 when it is closed, a fixed sealing ring 2 is connected to the annular surface of the butterfly plate 3, and the sealing ring 2 is in rotational contact with the inner surface of the valve body 1.

[0021] The specific operation process of the utility model is as follows: the butterfly valve is only suitable for the use of one-way input liquid. The butterfly plate 3 is driven to rotate by rotating the valve shaft 4, so as to open the valve. When the butterfly plate 3 rotates, two areas with different negative pressures will be generated. The liquid at the input end flows through the area with large negative pressure, and the liquid at the output end flows back to the input end in the area with small negative pressure. The refluxed liquid contacts the hinged plate. At this time, the hinged plate 8 is supported by the telescopic structure composed of the movable rod 7, the sleeve 6 and the elastic member 5, and the hinged plate 8 contacts the inner surface of the valve body 1 under the impact of the liquid at the output end, thereby preventing the liquid at the output end from further flowing into the output end. As the valve shaft 4 rotates and finally rotates the butterfly plate 3 90 degrees, the hinged plate 8 begins to be squeezed due to the large flow of liquid at the input end, and the hinged plate 8 is rotated to the side of the output end. At this time, the liquid at the input end on both sides of the butterfly plate 3 passes normally.

[0022] The above description of the utility model in combination with the accompanying drawings is an exemplary description. Obviously, the specific implementation of the utility model is not limited to the above-mentioned method. As long as the non-substantial improvements are made by adopting the method concept and technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. An anti-backflow electric butterfly valve, comprising a valve body (1), characterized in that: A butterfly plate (3) is rotatably connected inside the valve body (1), and a valve shaft (4) passing through the valve body (1) and extending outside the valve body (1) is fixedly connected to the upper surface of the butterfly plate (3). A hinged plate (8) is hingedly connected to a side of the butterfly plate (3) that is away from the input end and opposite to the rotation direction of the butterfly plate (3). A telescopic member is hingedly connected to a side of the hinged plate (8) that faces the butterfly plate (3), and an end of the telescopic member that is away from the hinged plate (8) is hingedly connected to the butterfly plate (3).

2. The anti-backflow electric butterfly valve according to claim 1, characterized in that: The telescopic member comprises a pipe sleeve (6), the pipe sleeve (6) being hinged on a surface of the butterfly plate (3) facing the hinge plate (8), a movable rod (7) being inserted at one end of the pipe sleeve (6) away from the butterfly plate (3), the end of the movable rod (7) away from the pipe sleeve (6) being hinged to the hinge plate (8), one end of the movable rod (7) in the pipe sleeve (6) being connected and fixed with an elastic member (5), and the end of the elastic member (5) away from the movable rod (7) being connected and fixed to the pipe sleeve (6).

3. The anti-backflow electric butterfly valve according to claim 1, characterized in that: A sealing ring (2) is fixedly connected to the annular surface of the butterfly plate (3), and the sealing ring (2) is in rotational contact with the inner surface of the valve body (1).

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