Eccentric reducing check valve

Abstract

The utility model relates to the related field of check valves, and particularly discloses an eccentric variable-diameter check valve which comprises a protective top cover, a check valve body, a liquid inlet head, a liquid outlet head and a valve plate, a limiting guide opening is formed in the check valve body, the valve plate is sealed in the limiting guide opening, the liquid inlet head and the liquid outlet head are arranged on the check valve body in the direction perpendicular to each other, and the liquid inlet head and the liquid outlet head are arranged on the check valve body in the direction perpendicular to each other. And a protective top cover is arranged at the top of the check valve main body. The valve plate is arranged, the limiting guide port can be externally sealed through the valve plate, the sealing plug is arranged in the middle of the bottom end of the valve plate, the limiting guide port can be sealed in a reinforced mode through the sealing plug, so that the sealing effect on the valve port can be improved, the telescopic rod is arranged at the top of the valve plate, and the top end of the telescopic rod is connected with the reset spring. Automatic reset sealing control can be conducted on the valve plate through the check valve body, the second flange plate is arranged on the top of the check valve body, the first flange plate is arranged at the bottom of the protective top cover, and the check valve body and the second flange plate can be conveniently assembled through the first flange plate.

Description

Technical Field

[0001] This utility model relates to the field of check valves, specifically an eccentric variable diameter check valve. Background Technology

[0002] A check valve is a type of valve whose opening and closing element is a circular valve disc that relies on its own weight and the pressure of the medium to prevent backflow. It belongs to the category of automatic valves and is also known as a non-return valve, one-way valve, backflow valve, or isolation valve. The valve disc movement is divided into lift type and swing type. The lift type check valve is structurally similar to a gate valve, except it lacks the valve stem that drives the valve disc. The medium flows in from the inlet end (bottom) and flows out from the outlet end (top). When the inlet pressure is greater than the sum of the valve disc's weight and its flow resistance, the valve is opened. Conversely, when the medium flows back, the valve is closed. The swing type check valve has an angled valve disc that can rotate around an axis, and its working principle is similar to that of the lift type check valve. Check valves are commonly used as foot valves in water pumping devices to prevent water backflow. A check valve used in combination with a gate valve can provide safety isolation. The disadvantages are high resistance and poor sealing when closed.

[0003] For example, the authorized patent with publication number CN222316037U (eccentric variable diameter check valve) includes a valve body, a valve seat, and a valve disc. The valve seat is located within a radial annular step between the valve body's inlet and outlet pipes. Its features include: the inlet pipe is composed of a variable diameter eccentric structure consisting of a small-diameter pipe, an expanded-diameter pipe, and a large-diameter pipe; the valve body inlet end can be directly connected to the water pump outlet pipe, reducing the number of pipe installation components; the valve disc is mounted on a radial positioning shaft within the valve body's outlet pipe by a torsion spring. When the medium passes through the variable diameter eccentric flow channel of the inlet pipe, the thrust generated on the lower part of the valve disc is greater than that on the upper part. This pushes the valve disc to rotate clockwise to open it. When the inlet medium pressure disappears, the torsion spring torque causes the valve disc to rotate back to its original position, and the reverse medium pressure and the torsion spring force press the valve disc tightly against the valve seat for a sealing fit. It has advantages such as simple product structure, convenient installation, and low installation cost.

[0004] The aforementioned check valves cannot control the direction of the discharged water flow, are not convenient for controlling the water flow rate, and have insufficient sealing effect on the limiting guide port, making it impossible to perform secondary enhanced sealing control. Utility Model Content

[0005] The purpose of this utility model is to provide an eccentric variable diameter check valve to solve the problems mentioned in the background art, such as the inability of the check valve to control the direction of the discharged water flow, the inconvenience of controlling the flow rate, the insufficient sealing effect of the limiting guide port, and the inability to perform secondary enhanced sealing control.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an eccentric variable diameter check valve, comprising a protective top cover, a check valve body, an inlet head, a drain head, and a valve plate. The check valve body has a limiting guide port inside, and the valve plate is sealed within the limiting guide port. The inlet head and the drain head are arranged perpendicularly to each other on the check valve body, and the top of the check valve body is provided with a protective top cover.

[0007] In a further embodiment, the protective top cover is provided with a first flange plate at its end, and the check valve body is provided with a second flange plate at its top end, with the first flange plate and the second flange plate being flange-fixed.

[0008] In a further embodiment, the end of the liquid inlet head is provided with a third flange plate, and the end of the liquid outlet head is provided with a fourth flange plate.

[0009] In a further embodiment, the protective top cover is provided with a return spring inside, and the telescopic rod of the return spring has its telescopic end connected to the top of the valve plate.

[0010] In a further embodiment, the bottom of the valve plate is provided with a sealing plug, the side of the sealing plug is provided with a tough buffer layer, and the sealing plug is sealed inside the limiting guide.

[0011] In a further embodiment, the inner diameter of the inlet head is set from small to large, and the inner diameter of the outlet head is set from large to small.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This utility model is equipped with a valve plate, which can externally seal the limiting guide port. A sealing plug is provided at the bottom center of the valve plate, which can strengthen the seal of the limiting guide port and improve the sealing effect of the valve port. A telescopic rod is provided at the top of the valve plate, and the top of the telescopic rod is connected to a return spring, which can automatically reset and seal the valve plate.

[0014] The check valve body of this utility model has a second flange plate on the top and a first flange plate on the bottom of the protective top cover. The first flange plate facilitates assembly with the second flange plate. Both the inlet head and the outlet head are designed with a variable diameter structure, which allows for flow control of the guide flow, facilitating the introduction and export of liquid. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an eccentric variable diameter check valve according to the present invention;

[0016] Figure 2 This is a schematic diagram of the main body of the check valve of this utility model;

[0017] Figure 3 This is a schematic diagram of the valve plate of this utility model;

[0018] Figure 4 This is a structural schematic diagram of part A of this utility model.

[0019] In the diagram: 1. Protective top cover; 2. First flange plate; 3. Second flange plate; 4. Check valve body; 5. Inlet head; 6. Third flange plate; 7. Drain head; 8. Fourth flange plate; 9. Valve plate; 10. Limiting guide port; 11. Telescopic rod; 12. Sealing plug; 13. Return spring. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Please see Figure 1-4 This utility model provides an embodiment of an eccentric variable diameter check valve, comprising a protective top cover 1, a check valve body 4, an inlet head 5, a drain head 7, and a valve plate 9. The check valve body 4 has a limiting guide port 10 inside, and the valve plate 9 is sealed within the limiting guide port 10. The inlet head 5 and drain head 7 are arranged perpendicularly to each other on the check valve body 4, and the top of the check valve body 4 is provided with a protective top cover 1. The limiting guide port 10 is used to guide the flow of fluid, and the valve plate 9 can control the opening and closing of the limiting guide port 10, thereby controlling the opening and closing of the check valve. The inlet head 5 and drain head 7 facilitate the introduction and discharge of fluid.

[0022] The protective top cover 1 is provided with a first flange plate 2 at its end, and the check valve body 4 is provided with a second flange plate 3 at its top. The first flange plate 2 and the second flange plate 3 are fixed together by flanges. The first flange plate 2 facilitates the assembly of the protective top cover 1 and the second flange plate 3 at the end of the check valve body 4.

[0023] The protective top cover 1 is equipped with a return spring 13 inside, and a telescopic rod 11 of the return spring 13. The telescopic end of the telescopic rod 11 is connected to the top of the valve plate 9. The return spring 13 is used to reset the telescopic rod 11 so that it can control the opening and closing of the valve plate 9. The bottom of the valve plate 9 is equipped with a sealing plug 12. The side of the sealing plug 12 is equipped with a tough buffer layer. The sealing plug 12 is sealed inside the limiting guide port 10. The limiting guide port 10 is double-sealed by the valve plate 9 and the sealing plug 12.

[0024] The inlet head 5 is equipped with a third flange plate 6 at its end, and the outlet head 7 is equipped with a fourth flange plate 8 at its end. The third flange plate 6 and the fourth flange plate 8 facilitate the assembly of the inlet head 5 and the outlet head 7 into a pipeline. The inner diameter of the inlet head 5 is set from small to large, and the inner diameter of the outlet head 7 is set from large to small. This design of the inlet head 5 and the outlet head 7 allows for flow control.

[0025] Working principle: During use, the fluid is introduced through the inlet head 5, and the flow rate is controlled by the variable diameter. The valve plate 9 seals the limiting guide port 10, and the sealing plug 12 at its bottom reinforces the seal. The fluid can lift the valve plate 9, and the extension rod 11 controls the raising and lowering of the valve plate 9. The return spring 13 controls the return of the valve plate 9. The protective top cover 1 seals and protects the return spring 13. The fluid is discharged through the drain head 7. The first flange plate 2 facilitates the flange fixation between the protective top cover 1 and the second flange plate 3. The third flange plate 6 and the fourth flange plate 8 facilitate the pipeline connection between the inlet head 5 and the drain head 7.

[0026] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An eccentric variable diameter check valve, comprising a protective top cover (1), a check valve body (4), an inlet head (5), a drain head (7), and a valve plate (9), characterized in that: The check valve body (4) is provided with a limiting guide (10) inside. The valve plate (9) is sealed inside the limiting guide (10). The check valve body (4) is provided with an inlet head (5) and a drain head (7) in mutually perpendicular directions. The top of the check valve body (4) is provided with a protective top cover (1). The protective top cover (1) is provided with a reset spring (13) inside. The telescopic rod (11) of the reset spring (13) is connected to the top of the valve plate (9) at the telescopic end. The bottom of the valve plate (9) is provided with a sealing plug (12). The side of the sealing plug (12) is provided with a tough buffer layer. The sealing plug (12) is sealed inside the limiting guide (10). The inner diameter of the inlet head (5) is set from small to large. The inner diameter of the drain head (7) is set from large to small.

2. The eccentric reducing diameter check valve according to claim 1, characterized in that: The protective top cover (1) is provided with a first flange plate (2) at its end, and the top of the check valve body (4) is provided with a second flange plate (3). The first flange plate (2) and the second flange plate (3) are fixed together by flange.

3. The eccentric reducing diameter check valve according to claim 1, characterized in that: The end of the liquid inlet head (5) is provided with a third flange plate (6), and the end of the liquid outlet head (7) is provided with a fourth flange plate (8).

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