Check valve with built-in heavy hammer

Abstract

The utility model belongs to the field of check valves, and particularly relates to a check valve with a built-in heavy hammer, which comprises a valve body, and a valve plate and the heavy hammer which are respectively arranged on the valve body, and is characterized in that the valve plate and the heavy hammer are both arranged in a cavity of the valve body, the upper end of the valve plate is hinged with the valve body by virtue of a rotating shaft, the heavy hammer is connected with the valve plate by virtue of an L-shaped rod, and the L-shaped rod is connected with the valve plate. The heavy hammer is connected with the vertical portion of the L-shaped rod, the valve plate is connected with the horizontal portion of the L-shaped rod, the force arm between the heavy hammer and the rotating shaft is larger than that between the valve plate and the rotating shaft, the heavy hammer is located on the air inlet side of the valve body, and the check valve can effectively reduce the size, reduce the occupied space and improve the adaptability to installation places.

Description

Technical Field

[0001] The utility model belongs to the field of check valves, and particularly relates to an internal weight check valve. Background Art

[0002] The check valve is an important component in the ventilation system of nuclear power plants. It is mostly installed at the outlet of the fan or on the system pipeline where there is a requirement to prevent the backflow of air. A convex weight protection cover is provided on the outer side of the valve body of the check valve, and usually one weight is connected to the valve body. The weight is located in the weight protection cover outside the valve body. Therefore, the check valve has a large volume and requires a large installation space. When the fan is running, the forward pressure formed in front of the valve opens the valve plate; when the fan stops, due to the loss of forward pressure and the action of the weight and the self-weight of the valve plate, the valve automatically closes to prevent system backflow. According to the actual use situation and feedback at the nuclear power site, the existing check valves occupy too much space and cannot meet the application requirements in places such as short pipelines or pipeline valves where no external extensions are allowed. Content of the Utility Model

[0003] In order to solve the problems existing in the above-mentioned prior art, the utility model provides an internal weight check valve, which can effectively reduce the volume, reduce the occupied space, and improve the adaptability to the installation site.

[0004] The specific technical solution adopted by the utility model is as follows:

[0005] An internal weight check valve includes a valve body, a valve plate and a weight respectively arranged on the valve body. The key lies in that the valve plate and the weight are both arranged in the cavity of the valve body. The upper end of the valve plate is hinged to the valve body by means of a rotating shaft. The weight is connected to the valve plate by means of an L-shaped rod. The weight is connected to the vertical part of the L-shaped rod, and the valve plate is connected to the horizontal part of the L-shaped rod. The force arm between the weight and the rotating shaft is greater than the force arm between the valve plate and the rotating shaft. The weight is located on the air inlet side of the valve body.

[0006] The valve plate includes a main valve plate and a driven valve plate respectively connected to the valve body by means of a rotating shaft. The main valve plate is connected to the weight by means of an L-shaped rod. The main valve plate and the driven valve plate are connected by means of a linkage mechanism.

[0007] The linkage mechanism includes a vertical connecting rod and a group of horizontal connecting rods connected to the vertical connecting rod. The horizontal connecting rods are respectively hinged to the main valve plate and the driven valve plate.

[0008] The number of weights ≥ 2.

[0009] A sealing ring is arranged between the valve body and the valve plate.

[0010] An opening degree indicator board with scales thereon and a pointer matching the opening degree indicator board are provided on the described valve body. The pointer is coaxially arranged with the rotating shaft and connected to the valve plate.

[0011] The beneficial effects of the present utility model are:

[0012] In the present utility model, the weight is directly connected to the valve plate by means of an L-shaped rod, the distance between the weight and the valve plate is shortened, the weight is located inside the valve body, the setting of the weight protection cover is cancelled, the overall volume of the check valve is effectively reduced, the space required for the installation of the check valve is reduced, and the adaptability of the check valve to the installation environment is improved;

[0013] By means of the weight, the self-weight of the valve plate is increased to control the opening pressure of the valve plate and improve the sealing performance of the check valve; the force arm between the weight and the rotating shaft is greater than the force arm between the valve plate and the rotating shaft, which helps to reduce the weight of the weight, that is, reduce the volume of the weight, and facilitate the installation of the weight and the valve plate together in the cavity of the valve body. Description of the Drawings

[0014] Figure 1 is a structural schematic diagram of the present utility model;

[0015] Figure 2 is Figure 1 the left view of

[0016] Figure 3 is Figure 1 the sectional view taken along the A-A direction in

[0017] Figure 4 is Figure 2 the enlarged schematic view of the partial B in

[0018] In the drawings, 1. valve body, 2. weight, 3. rotating shaft, 4. air inlet side, 5. active valve plate, 6. driven valve plate, 7. linkage mechanism, 8. vertical connecting rod, 9. horizontal connecting rod, 10. L-shaped rod, 11. sealing ring, 12. opening degree indicator board, 13. pointer. Detailed Embodiments

[0019] The present utility model will be further described below in conjunction with the drawings and specific embodiments:

[0020] The specific embodiment is as Figures 1-4As shown in the figure, an internal weight check valve includes a valve body 1, a valve plate and a weight 2 respectively arranged on the valve body 1. The key is that the valve plate and the weight 2 are both arranged in the cavity of the valve body 1. The upper end of the valve plate is hinged to the valve body 1 by means of a rotating shaft 3. The weight 2 is connected to the valve plate by means of an L-shaped rod 10. The weight 2 is connected to the vertical part of the L-shaped rod 10, and the valve plate is connected to the horizontal part of the L-shaped rod 10. The lever arm between the weight 2 and the rotating shaft 3 is greater than the lever arm between the valve plate and the rotating shaft 3. The weight 2 is located on the air inlet side 4 of the valve body 1. The valve body 1 is welded by a frame, and flange holes are configured on the frame for installation with on-site pipelines.

[0021] By jointly installing the valve plate and the weight 2 in the cavity of the valve body 1, the setting of the weight protection cover of the existing check valve is omitted, the overall volume of the check valve is reduced, the space occupied by the installation of the check valve is reduced, and the adaptability of the check valve to the installation environment is improved; the L-shaped rod 10 shortens the horizontal distance between the weight 2 and the valve plate, which helps to reduce the volume of the check valve; on the other hand, the lever arm between the weight 2 and the rotating shaft 3 is greater than the lever arm between the valve plate and the rotating shaft 3, and the weight 2 is located on the air inlet side 4 of the valve body 1. The pressure of the weight 2 is used to balance the pressure of the valve plate, so that the valve plate can be sealed with the valve body when the pressure in the pipeline is insufficient, and it helps to reduce the weight of the weight 2, thereby reducing the volume of the weight 2 and facilitating the installation of the weight 2 in the cavity of the valve body 1.

[0022] On the other hand, during the opening process of the valve plate, the weight 2 has a tendency to move downward under its own gravity, which helps to open the valve plate.

[0023] Further, the valve plate includes a main valve plate 5 and a driven valve plate 6 respectively connected to the valve body 1 by means of a rotating shaft 3. The main valve plate 5 is connected to the weight 2 by means of an L-shaped rod 10. The main valve plate 5 and the driven valve plate 6 are connected by means of a linkage mechanism 7. When the pressure at the air inlet side 4 of the valve body 1 in the pipeline increases, the main valve plate 5 is pushed and rotates along the rotating shaft 3. The main valve plate 5 drives the driven valve plate 6 to open simultaneously by means of the linkage mechanism 7, so that the gas passes through the valve body 1 from the air inlet side 4. When the wind force decreases, the main valve plate 5 rotates reversely along the rotating shaft 3 under the action of gravity and resets, and at the same time the main valve plate 5 drives the driven valve plate 6 to reset.

[0024] The lever arm between the weight 2 and the rotating shaft 3 is greater than the lever arm between the main valve plate 5 and the rotating shaft 3.

[0025] The linkage mechanism 7 includes a vertical connecting rod 8 and a group of horizontal connecting rods 9 connected to the vertical connecting rod 8. The horizontal connecting rods 9 are respectively hinged to the active valve plate 5 and the driven valve plate 6. The linkage mechanism 7 and the weight 2 are located on both sides of the valve plate. That is, the horizontal connecting rods 9 and the L-shaped rod 10 are respectively connected to both sides of the active valve plate 5, and the horizontal connecting rods 9 are also respectively connected to the driven valve plate 8. When the active valve plate 5 rotates along the rotating shaft 3, the horizontal connecting rod 9 connected to the active valve plate 5 pushes the vertical connecting rod 8, and the vertical connecting rod 8 drives the other horizontal connecting rods 9 to swing, so as to drive the driven valve plate 8 to rotate and open along its rotating shaft 3.

[0026] The number of weights 2 ≥ 2, which can be selected according to the opening pressure of the actual check valve. And at least two weights 2 are provided, and the weights 2 as counterweights are separately arranged in the cavity of the valve body 1, which helps to reduce the volume of a single weight 2, thereby reducing the volume of the check valve.

[0027] A sealing ring 11 is provided between the valve body 1 and the valve plate. When the valve plate is closed, it fits with the sealing ring 11 to improve the sealing performance of the check valve and prevent air backflow.

[0028] An opening degree indicator plate 12 with scales thereon and a pointer 13 matching the opening degree indicator plate 12 are provided on the valve body 1. The pointer 13 is coaxially arranged with the rotating shaft 3 and connected to the valve plate. In this embodiment, an opening degree indicator plate 12 is provided in a matching manner with one rotating shaft 3 on the valve body 1, and the rotating shaft 3 is fixedly connected to the valve body 1. Therefore, the pointer 13 is fixedly connected to the rotating shaft 3 to realize the connection with the active valve plate 5 or the driven valve plate 6. When the valve plate rotates, the pointer 13 rotates along the axis of the rotating shaft 3, so as to correspond to the scales on the opening degree indicator plate 12, which is convenient for the staff to intuitively understand the opening angle of the valve plate.

[0029] The utility model belongs to the field of check valves, and particularly relates to an internal weight check valve, which includes a valve body, a valve plate and a weight respectively arranged on the valve body. The key lies in that the valve plate and the weight are both arranged in the cavity of the valve body. The upper end of the valve plate is hinged to the valve body by means of a rotating shaft. The weight is connected to the valve plate by means of an L-shaped rod. The weight is connected to the vertical part of the L-shaped rod, and the valve plate is connected to the horizontal part of the L-shaped rod. The force arm between the weight and the rotating shaft is greater than the force arm between the valve plate and the rotating shaft. The weight is located on the air inlet side of the valve body. This check valve can effectively reduce the volume, reduce the occupied space, and improve the adaptability to the installation site.

Claims

1. An internal heavy hammer check valve, comprising a valve body (1), a valve plate and a heavy hammer (2) respectively arranged on the valve body (1), and is characterized in that: The described valve plate and the weight (2) are both arranged in the cavity of the valve body (1). The upper end of the valve plate is hinged to the valve body (1) by means of a rotating shaft (3). The weight (2) is connected to the valve plate by means of an L-shaped rod (10). The weight (2) is connected to the vertical part of the L-shaped rod (10), and the valve plate is connected to the horizontal part of the L-shaped rod (10). The lever arm between the weight (2) and the rotating shaft (3) is greater than the lever arm between the valve plate and the rotating shaft (3). The weight (2) is located on the air inlet side (4) of the valve body (1).

2. The built-in weight check valve according to claim 1, characterized in that: The described valve plate includes a main valve plate (5) and a driven valve plate (6) which are respectively connected to the valve body (1) by means of a rotating shaft (3). The main valve plate (5) is connected to the weight (2) by means of an L-shaped rod (10). The main valve plate (5) and the driven valve plate (6) are connected by means of a linkage mechanism (7).

3. The built-in weight check valve according to claim 2, characterized in that: The described linkage mechanism (7) includes a vertical connecting rod (8) and a group of horizontal connecting rods (9) connected to the vertical connecting rod (8). The horizontal connecting rods (9) are respectively hinged to the main valve plate (5) and the driven valve plate (6).

4. The built-in weight check valve according to claim 1, characterized in that: The number of the weights (2) ≥ 2.

5. The built-in weight check valve according to claim 1, wherein: A sealing ring (11) is arranged between the valve body (1) and the valve plate.

6. The built-in weight check valve according to claim 1, characterized in that: An opening degree indicator plate (12) with scales thereon and a pointer (13) matching the opening degree indicator plate (12) are arranged on the valve body (1). The pointer (13) is coaxially arranged with the rotating shaft (3) and is connected to the valve plate.

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