Backflow prevention stop valve

Abstract

The utility model discloses an anti-backflow stop valve, and relates to the technical field of stop valves, the anti-backflow stop valve comprises a stop valve main body, the whole stop valve main body is of a rectangular hollow structure, one corner of the stop valve main body of the rectangular hollow structure is an inclined surface, and two adjacent surfaces of the inclined surface opposite to the corner are fixedly communicated with pipe connecting ends; pistons used for sealing the pipe ends are arranged on the inner walls of the two adjacent faces of the inclined face in a sliding mode, and cavities communicated with the pipe ends are formed in the pistons. According to the anti-backflow stop valve, the cavity is formed in the piston, backflow water can directly flow into the cavity and then form impact, the flow blocking rod is arranged in the cavity, the speed of the backflow water entering the cavity can be reduced, and therefore the impact strength is reduced, and when the anti-backflow stop valve is used, the flow blocking rod is not prone to falling off. And backflow water cannot directly impact the surface of the piston and slowly erode and deform after long-time use, so that the sealing performance of the piston is not influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of stop valves, in particular to a backflow prevention stop valve. Background Art

[0002] The opening and closing parts of the stop valve are plug-shaped discs, and the sealing surface is flat or conical. The disc moves linearly along the center line of the valve seat. The movement of the valve stem can also be a lifting and rotating rod type. The stop valve refers to a valve whose closing part moves along the center line of the valve seat. According to this movement of the disc, the change of the valve seat opening is proportional to the disc stroke. Since the valve stem opening or closing stroke of this type of valve is relatively short and has a very reliable cutting function, and since the change of the valve seat opening is proportional to the disc stroke, it is very suitable for regulating the flow rate. Therefore, this type of shut-off stop valve is very suitable for cutting, regulating and throttling;

[0003] The valve plates of existing stop valves are directly sealed on one side of the valve port. When liquid refluxes, the impact force acts directly on the valve disc without any buffer device. After long-term use, the valve disc is prone to wear, resulting in reduced sealing performance, making it impossible to effectively seal the liquid, and liquid reflux is likely to occur, which is not conducive to use. Utility Model Content

[0004] The utility model aims to provide an anti-backflow stop valve to solve the problem that the valve plates of the existing stop valves proposed in the above-mentioned background technology are directly sealed on one side of the valve port. When the liquid refluxes, the impact force acts directly on the valve disc without any buffer device. After long-term use, the valve disc is prone to wear, resulting in reduced sealing performance, inability to effectively seal the liquid, and prone to liquid reflux, which is not conducive to use.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a backflow prevention stop valve, including a stop valve body, the stop valve body as a whole is a rectangular hollow structure, one of the corners of the stop valve body of the rectangular hollow structure is an inclined surface, two adjacent surfaces at the angle of the inclined surface are fixedly connected with a connecting pipe end, the inner walls of the two adjacent surfaces at the angle of the inclined surface are slidably provided with a piston for closing the connecting pipe end, and a cavity connected with the connecting pipe end is opened in the piston.

[0006] Preferably, an adjustment portion is provided on the outer surface of the inclined surface, and the adjustment portion includes a knob threadedly connected to the inclined surface, the end of the knob extends into the stop valve body, and a connecting rod is provided between the periphery of one end of the knob extending into the stop valve body and the side surfaces of the two pistons, and the two ends of the connecting rod are respectively rotatably connected to the knob and the piston.

[0007] Preferably, a T-shaped block is fixedly connected to the side surface of the piston, and the inner walls of the two adjacent surfaces of the inclined surface facing each other are both provided with T-shaped grooves matching the T-shaped block.

[0008] Preferably, a water inlet hole is opened on the side of the piston, and the connecting pipe end is connected with the cavity through the water inlet hole. A partition is arranged in the cavity, and the partition is fixedly connected to the bottom of the cavity, and the partition is perpendicular to the sliding direction of the piston.

[0009] Preferably, the height of the partition is smaller than the height of the cavity, and a plurality of flow-blocking rods are fixedly connected between the side surface of the partition and the inner wall of the cavity.

[0010] Compared with the prior art, the beneficial effects of the utility model are as follows: the anti-backflow stop valve, by opening a cavity in the piston, allows the backflow water to directly flow into the cavity and then form an impact, and a flow-blocking rod is arranged in the cavity, so that the speed of the backflow water entering the cavity can be reduced, thereby reducing the intensity of the impact, so that when in use, the backflow water will not directly impact the surface of the piston, slowly corroding and deforming it over time, thereby affecting the sealing of the piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0012] Figure 2 This is a schematic diagram of the internal structure of the stop valve body of the utility model;

[0013] Figure 3 It is an exploded schematic diagram of the overall structure of the utility model;

[0014] Figure 4 This is a schematic diagram of the piston structure of the utility model when viewed from above;

[0015] Figure 5 It is a cross-sectional schematic diagram of the piston structure of the utility model.

[0016] In the figure: 1. stop valve body; 11. inclined surface; 12. T-slot; 2. adjustment part; 21. knob; 22. connecting rod; 3. pipe end; 4. piston; 41. T-block; 42. water inlet hole; 43. cavity; 44. partition; 45. flow blocking rod. DETAILED DESCRIPTION

[0017] 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.

[0018] See also Figure 1-5 The utility model provides a technical solution: a backflow prevention stop valve, including a stop valve body 1, the stop valve body 1 is a rectangular hollow structure as a whole, one of the corners of the stop valve body 1 of the rectangular hollow structure is an inclined surface 11, two adjacent surfaces diagonally opposite to the inclined surface 11 are fixedly connected with a pipe end 3, the inner walls of the two adjacent surfaces diagonally opposite to the inclined surface 11 are slidably provided with a piston 4 for closing the pipe end 3, and a cavity 43 connected with the pipe end 3 is opened in the piston 4.

[0019] Specifically, the connecting pipe end 3 is connected to the water inlet pipe and the water outlet pipe of the water pipe, and the piston 4 slides to control the opening and closing of the connecting pipe end 3. The setting of the cavity 43 allows the backflowing water to directly flow into the cavity 43 when closed, and then impact the inner wall of the cavity 43. The inner wall area of ​​the cavity 43 is large, which can buffer the impact force and reduce the erosion caused by the impact.

[0020] An adjusting portion 2 is provided on the outer surface of the inclined surface 11, and the adjusting portion 2 includes a knob 21 threadedly connected to the inclined surface 11, and the end of the knob 21 extends into the stop valve body 1. A connecting rod 22 is provided between the periphery of one end of the knob 21 extending into the stop valve body 1 and the side surfaces of the two pistons 4, and the two ends of the connecting rod 22 are rotatably connected to the knob 21 and the piston 4 respectively.

[0021] Specifically, the regulating part 2 drives the piston 4 to move, and controls the opening and closing of the pipe end 3. When in use, the knob 21 is rotated, and the knob 21 moves under the action of the thread, and then drives the piston 4 to slide through the connecting rod 22.

[0022] A T-shaped block 41 is fixedly connected to the side surface of the piston 4 , and inner walls of two adjacent surfaces diagonally opposite to the inclined surface 11 are both provided with T-shaped grooves 12 matching the T-shaped block 41 .

[0023] Specifically, the piston 4 slides stably under the cooperation of the T-shaped block 41 and the T-shaped groove 12 .

[0024] A water inlet hole 42 is provided on the side of the piston 4, and the pipe end 3 is connected to the cavity 43 through the water inlet hole 42. A partition 44 is provided in the cavity 43, and the partition 44 is fixedly connected to the bottom of the cavity 43, and the partition 44 is perpendicular to the sliding direction of the piston 4.

[0025] Specifically, the backflow water flows into the cavity 43 through the water inlet hole 42, and the partition plate 44 forms two storage chambers, so that the backflow water can flow to a certain extent in the cavity 43, thereby reducing the impact force of the backflow to a certain extent.

[0026] The height of the partition 44 is smaller than the height of the cavity 43 , and a plurality of blocking rods 45 are fixedly connected between the side surface of the partition 44 and the inner wall of the cavity 43 .

[0027] Specifically, the height of the partition 44 is smaller than the height of the cavity 43, so that the two storage chambers are interconnected, the water entering therein can flow, and the blocking rod 45 can block the backflowing liquid, thereby reducing the impact force of the backflow.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A backflow prevention stop valve, characterized in that: It comprises a stop valve body (1), wherein the stop valve body (1) is a rectangular hollow structure as a whole; One of the corners of the stop valve body (1) of the rectangular hollow structure is an inclined surface (11), and two adjacent surfaces diagonally opposite to the inclined surface (11) are both fixedly connected to a pipe end (3); The inner walls of two adjacent surfaces at opposite corners of the inclined surface (11) are both slidably provided with pistons (4) for sealing the pipe end (3); The piston (4) is provided with a cavity (43) in communication with the pipe end (3); A water inlet hole (42) is provided on the side of the piston (4), and the pipe end (3) is connected to the cavity (43) through the water inlet hole (42). A partition (44) is provided in the cavity (43), and the partition (44) is fixedly connected to the bottom of the cavity (43), and the partition (44) is perpendicular to the sliding direction of the piston (4).

2. The backflow prevention stop valve according to claim 1, characterized in that: An adjusting portion (2) is provided on the outer surface of the inclined surface (11), the adjusting portion (2) comprising a knob (21) threadedly connected to the inclined surface (11), the end of the knob (21) extending into the stop valve body (1), a connecting rod (22) being provided between the periphery of one end of the knob (21) extending into the stop valve body (1) and the side surfaces of the two pistons (4), the two ends of the connecting rod (22) being rotatably connected to the knob (21) and the piston (4) respectively.

3. The backflow prevention stop valve according to claim 1, characterized in that: A T-shaped block (41) is fixedly connected to the side surface of the piston (4), and the inner walls of two adjacent diagonal surfaces of the inclined surface (11) are both provided with T-shaped grooves (12) matching the T-shaped block (41).

4. The backflow prevention stop valve according to claim 1, characterized in that: The height of the partition (44) is smaller than the height of the cavity (43), and a plurality of flow-blocking rods (45) are fixedly connected between the side surface of the partition (44) and the inner wall of the cavity (43).

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