Fluid non-return mechanism

Abstract

The utility model relates to the technical field of non-return mechanisms, in particular to a fluid non-return mechanism. The fluid non-return mechanism is arranged at a liquid outlet of the valve body and used for preventing liquid from flowing back, a copper sleeve is arranged at the liquid outlet of the valve body, the fluid non-return mechanism comprises a valve plate rotationally connected with the valve body, a rubber sealing plate and a pressing ring are sequentially arranged on the side, close to the copper sleeve, of the valve plate, and the pressing ring is used for enabling the rubber sealing plate to be tightly attached to the valve plate. A rubber sheet limiting mechanism is arranged between the rubber sealing plate and the valve plate, and anti-skid mechanisms are arranged on the sides, close to the rubber sealing plate, of the valve plate and the pressing ring. Due to the arrangement of the groove and the boss on the valve plate, the rubber sealing plate is prevented from overturning towards one side, the rubber sealing plate part which is not pressed by the pressing ring cannot extend outwards to be rolled, and the friction force among the valve plate, the pressing ring and the rubber sealing plate is increased through the concentric circle or spiral line groove so as to prevent the contact part of the rubber sealing plate and the pressing ring from sliding. And the rubber sealing plate is prevented from being pressed on the copper sleeve in a rolled state to affect sealing.

Description

Technical Field

[0001] The utility model relates to the technical field of check mechanisms, and particularly relates to a fluid check mechanism. Background Technique

[0002] A fluid check mechanism is a mechanism for preventing the reverse flow of a medium, and is commonly used in swing check valves, wet alarm valves and other valves. The basic structure includes a valve body (referred to as the valve body for short), a copper sleeve (referred to as the valve seat for short) and a valve sealing plate (referred to as the valve plate for short) are inlaid on the valve body, rubber is attached to the valve sealing plate, the valve plate rotates around a rotating shaft, and the rotating shaft is installed on the valve body. When the rubber contacts the copper sleeve, the contact surfaces of the two fit and squeeze each other, so as to block the outlet of the medium flow. In this way, the medium can only pass through in the forward direction and cannot pass through in the reverse direction, so as to prevent the reverse flow of the medium.

[0003] There are mainly two combination methods of rubber and copper sleeve:

[0004] First, vulcanize the rubber on the valve plate. The effect is equivalent to that the valve plate has a rubber coating. In this way, the contact surfaces of the two are adhered together, so there can be no relative movement. This will cause two problems: 1. When the medium has a reverse flow tendency, the check mechanism needs to play a sealing role, which is achieved by the extrusion of the rubber and the copper sleeve. Rubber is an elastic material and will deform. However, due to the fact that the contact surface between the rubber and the valve plate cannot have relative movement, the contact surface between the rubber and the valve seat will wrinkle, so that the sealing effect of the check mechanism will be reduced; 2. When the check valve works, the valve plate opens and closes, and the collision force between the valve plate and the valve seat is very large. The rubber is extruded many times and will reach the end of its service life. The valve plate needs to be replaced after a period of use. Since the rubber and the valve plate are adhered together, when replacing, the valve plate will be replaced together with the rubber, which increases the use cost.

[0005] Second, the rubber sheet is pressed on the valve plate by a pressing ring and screws. In this way, the contact surface between the rubber and the valve plate can have relative movement, and the rubber is also easy to replace. However, the following problems will also occur: when the medium flows forward, the part of the rubber sheet that is not pressed by the pressing ring will leave the valve plate under the impact of the medium. If the impact force is large enough, the rubber sheet will also extend outwards. When the extension dimension is large enough, the rubber sheet is easy to roll up. When the rolling angle is large enough, the medium flows in the reverse direction, and the rubber sheet is pressed on the valve seat in the rolled-up state, resulting in that the valve plate cannot fit with the valve seat and cannot achieve sealing. Summary of the Invention

[0006] In view of the above situation, the utility model provides a fluid check mechanism to solve the problems involved in the background technique.

[0007] To achieve the above object, the present utility model provides the following technical solutions: A fluid check mechanism is provided at the liquid outlet of the valve body to prevent liquid backflow. A copper sleeve is provided at the liquid outlet of the valve body. The fluid check mechanism includes a valve plate rotatably connected to the valve body. On one side of the valve plate close to the copper sleeve, a rubber sealing plate and a pressing ring are sequentially provided. The pressing ring is used to press the rubber sealing plate tightly against the valve plate;

[0008] A rubber sheet limiting mechanism is provided between the rubber sealing plate and the valve plate. Anti-slip mechanisms are provided on one side of the valve plate and the pressing ring close to the rubber sealing plate.

[0009] A further technical solution of the present utility model is that the limiting mechanism includes a groove provided on the valve plate and a boss provided on the rubber sealing plate. The boss is provided in the groove.

[0010] A further technical solution of the present utility model is that the anti-slip mechanism includes concentric circular grooves or spiral grooves provided on one side of the valve plate and the pressing ring close to the rubber sealing plate.

[0011] A further technical solution of the present utility model is that fixing holes are provided on the valve plate, the rubber sealing plate and the pressing ring, and screws are provided in the fixing holes to fixedly connect the valve plate, the rubber sealing plate and the pressing ring.

[0012] A further technical solution of the present utility model is that the groove and the boss are distributed in a ring shape or a dot shape.

[0013] A further technical solution of the present utility model is that the boss and the groove have the same shape.

[0014] A further technical solution of the present utility model is that the cross-section of the boss is rectangular or trapezoidal.

[0015] A further technical solution of the present utility model is that the diameter of the pressing ring is smaller than the diameter of the rubber sealing plate.

[0016] A further technical solution of the present utility model is that the fixing holes are provided at the centers of the valve plate, the rubber sealing plate and the pressing ring.

[0017] Compared with the prior art, the beneficial effects of the present utility model are:

[0018] The provision of the groove and the boss on the valve plate of the present utility model can, to a certain extent, prevent the rubber sealing plate from flipping to one side, so that the part of the rubber sealing plate not pressed by the pressing ring will not extend outwards and curl. At the same time, concentric circles or spiral grooves are machined on the surfaces of the valve plate and the pressing ring to increase the friction between the valve plate, the pressing ring and the rubber sealing plate to prevent the sliding of the contact part between the rubber sealing plate and the pressing ring. Under the action of the above two factors, the rubber sheet will not extend outwards, and the curling angle of the rubber sheet is reduced, thereby preventing the rubber sealing plate from being pressed on the copper sleeve in the curled state and affecting the sealing. Brief Description of the Drawings

[0019] Figure 1 is a schematic side-sectional structure diagram of an embodiment of the present utility model;

[0020] Figure 2 is a schematic side-sectional structure diagram of the combination with the valve body of an embodiment of the present utility model;

[0021] Figure 3 is a schematic structure diagram of part A of an embodiment of the present utility model;

[0022] Figure 4 is a schematic structure diagram of the boss and groove structure at position B of an embodiment of the present utility model;

[0023] In the figure:

[0024] Valve body 1, liquid outlet 2, copper sleeve 3, valve plate 4, rotating shaft 5, rubber sealing plate 6, pressing ring 7, screw 8, groove 9, boss 10, spiral groove 11. Detailed Description of the Preferred Embodiments

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments; based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0026] Embodiment 1:

[0027] As shown by Figures 1-4 , a fluid check mechanism is provided at the liquid outlet 2 of the valve body 1 to prevent liquid backflow. A copper sleeve 3 is provided at the liquid outlet 2. When the fluid check mechanism is in contact with the copper sleeve 3, the liquid outlet 2 is blocked.

[0028] It includes a valve plate 4 rotatably connected to the valve body 1. The valve plate 4 is rotatably connected to the valve body 1 through a rotating shaft 5. On the side of the valve plate 1 close to the copper sleeve at the liquid outlet 2, a rubber sealing plate 6 and a pressing ring 7 are sequentially provided. The pressing ring 7 is used to make the rubber sealing plate 6 closely adhere to the valve plate 4; fixing holes are provided at the centers of the valve plate 4, the rubber sealing plate 6, and the pressing ring 7, and screws 8 are provided in the fixing holes to fixedly connect the valve plate 4, the rubber sealing plate 6, and the pressing ring 7. The rubber sealing plate 6 closely adheres to the valve plate 4 under the extrusion of the pressing ring 7 and the screw 8. A rubber sheet limiting mechanism is provided between the rubber sealing plate 6 and the valve plate 4 to prevent the rubber sealing plate 6 from extending and curling under extrusion( Figure 1In (the direction indicated by the arrow), anti-slip mechanisms are provided on one side of the valve plate 4 and the pressing ring 7 close to the rubber sealing plate 6, for increasing the friction force between the rubber sealing plate 6 and the valve plate 4 and the pressing ring 7.

[0029] The limiting mechanism includes a groove 9 provided on the valve plate 4 and a boss 10 provided on the rubber sealing plate 6. The boss 10 and the groove 9 have the same shape, and the boss 10 is press-fitted into the groove 9. The groove 9 and the boss 10 are annularly distributed or dot-shaped distributed. The cross-section of the boss 10 is rectangular or trapezoidal. After elastic deformation of the boss 10, it can be squeezed into the groove 9, increasing the acting force between the edge part of the rubber sealing plate 6 and the valve plate 4, preventing curling as shown in the direction of the arrow in Figure 1 so as to prevent the rubber sealing plate 6 in the curled state from being pressed on the copper sleeve 3. The diameter of the pressing ring 7 is smaller than the diameter of the rubber sealing plate 6, enabling the edge part of the rubber sealing plate 6 to contact the copper sleeve 3 of the valve body 1 to achieve sealing.

[0030] The anti-slip mechanism includes concentric circular grooves or spiral grooves 11 provided on one side of the valve plate 1 and the pressing ring 7 close to the rubber sealing plate 6, for increasing the friction force between the valve plate 4, the pressing ring 7 and the rubber sealing plate 6 to prevent the sliding of the contact part between the rubber sealing plate 6 and the pressing ring 7.

[0031] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fluid check mechanism is provided at the liquid outlet of the valve body to prevent liquid backflow. A copper bushing is provided at the liquid outlet of the valve body, and it is characterized in that: It includes a valve plate rotatably connected to the valve body. On one side of the valve plate close to the copper bushing, a rubber sealing plate and a pressing ring are sequentially arranged, and the pressing ring is used to make the rubber sealing plate closely adhere to the valve plate; A rubber sheet limiting mechanism is arranged between the rubber sealing plate and the valve plate, and anti-slip mechanisms are arranged on one side of the valve plate and the pressing ring close to the rubber sealing plate; The limiting mechanism includes a groove arranged on the valve plate and a convex platform arranged on the rubber sealing plate, and the convex platform is arranged in the groove; the groove and the convex platform are distributed in a ring shape or a point shape; the shapes of the convex platform and the groove are the same; the cross-section of the convex platform is rectangular or trapezoidal.

2. The fluid check mechanism according to claim 1, characterized in that: The anti-slip mechanism includes concentric circular grooves or spiral grooves arranged on one side of the valve plate and the pressing ring close to the rubber sealing plate.

3. The fluid check mechanism according to claim 1, wherein: Fixing holes are arranged on the valve plate, the rubber sealing plate and the pressing ring, and screws are arranged in the fixing holes, and the valve plate, the rubber sealing plate and the pressing ring are fixedly connected by the screws.

4. The fluid check mechanism according to claim 1, wherein: The diameter of the pressing ring is smaller than the diameter of the rubber sealing plate.

5. The fluid check mechanism according to claim 3, characterized in that: The fixing holes are arranged at the centers of the valve plate, the rubber sealing plate and the pressing ring.

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