One-way pressure relief gate valve structure

Abstract

The utility model provides a one-way pressure relief gate valve structure which comprises a valve body, a valve cover, a valve rod, a valve plate and a valve rod operating mechanism. The valve rod operating mechanism drives the valve rod to do lifting motion; the valve plate is rotationally mounted at the bottom of the valve rod; when the valve plate is in a vertical state, the valve plate is located between the upstream side valve port and the downstream side valve port, water on the downstream side is blocked, and the valve plate can only rotate towards the downstream side under the action of water pressure on the upstream side under the action of a limiting clamping groove. The utility model provides a one-way pressure relief gate valve structure which is used for blocking downstream fluid when a valve is closed, and when the upstream side fluid pressure is larger than the downstream side fluid pressure, the upstream side fluid pressure can be relieved, and safety is guaranteed. The device has the advantages of convenient operation, safety, reliability, economy, reasonability and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of gate valves, and in particular relates to a one-way pressure relief gate valve structure. Background Art

[0002] The tailwater accident gate of a pumped storage power station is a gate valve structure, arranged on the downstream side of the powerhouse, and is a key device to prevent the expansion of flooding accidents. When an accident occurs in the powerhouse, the gate valve is immediately closed to prevent the downstream water from entering the powerhouse and causing the flooding accident to expand. In the prior art, when the gate valve blocks the downstream water, due to various factors, when the upstream water leaks beyond the gate valve design pressure, it is easy to cause the gate valve to be damaged and cause an accident. Utility Model Content

[0003] In view of the defects in the prior art, the utility model provides a one-way pressure relief gate valve structure, which can effectively solve the above problems.

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

[0005] The utility model provides a one-way pressure relief gate valve structure, comprising a valve body (1), a valve cover (2), a valve stem (3), a valve plate (4) and a valve stem operating mechanism (7);

[0006] One end of the valve body (1) is an upstream valve port (1-1), and the other end is a downstream valve port (1-2); the upstream valve port (1-1) and the downstream valve port (1-2) are connected to form a flow passage; the valve cover (2) is arranged on the upper part of the valve body (1), and the upper cavity of the valve body (1) is connected to and perpendicular to the flow passage; the valve stem (3) is arranged in the upper cavity of the valve body (1) and is perpendicular to the flow passage, and the valve stem operating mechanism (7) is installed on the top of the valve stem (3); the valve stem operating mechanism (7) drives the valve stem (3) to move up and down; the valve plate (4) is rotatably installed on the bottom of the valve stem (3); when the valve plate (4) is in a vertical state, it is located between the upstream valve port (1-1) and the downstream valve port (1-2) to block the water on the downstream side, and can only rotate toward the downstream side under the action of the upstream water pressure through the action of the limit slot (8).

[0007] Preferably, a supporting device (5) is installed on the downstream side of the bottom of the valve stem (3); a vertical supporting track (6) is provided on the side wall of the upper cavity of the valve body (1) and located on the downstream side, and the end of the supporting device (5) moves along the supporting track (6).

[0008] The one-way pressure relief gate valve structure provided by the utility model has the following advantages:

[0009] The utility model provides a one-way pressure relief gate valve structure, which is used to block the downstream fluid when the valve is closed, and when the upstream fluid pressure is greater than the downstream fluid pressure, the upstream fluid pressure can be released to ensure safety. It has the advantages of convenient operation, safety, reliability, economy and rationality. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a structural schematic diagram of a one-way pressure relief gate valve provided by the utility model;

[0011] Figure 2 It is a schematic diagram of bidirectional flow of a one-way pressure relief gate valve provided by the utility model;

[0012] Figure 3 It is a schematic diagram of one-way flow blocking of a one-way pressure relief gate valve provided by the utility model;

[0013] Figure 4 The utility model is a schematic diagram of one-way pressure relief of a one-way pressure relief gate valve. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0015] In the description of the utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0016] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0017] The utility model provides a one-way pressure relief gate valve structure, which is used to block downstream fluid when the valve is closed, and when the upstream fluid pressure is greater than the downstream fluid pressure, the upstream fluid pressure can be released to ensure safety.

[0018] See also Figure 1 The utility model provides a one-way pressure relief gate valve structure, including a valve body 1, a valve cover 2, a valve stem 3, a valve plate 4 and a valve stem operating mechanism 7;

[0019] One end of the valve body 1 is an upstream valve port 1-1, and the other end is a downstream valve port 1-2; the upstream valve port 1-1 and the downstream valve port 1-2 are connected to form a flow passage; the valve cover 2 is arranged on the upper part of the valve body 1, and the upper cavity of the valve body 1 is connected and perpendicular to the flow passage; the valve stem 3 is arranged in the upper cavity of the valve body 1 and is perpendicular to the flow passage, and the valve stem operating mechanism 7 is installed on the top of the valve stem 3; the valve stem operating mechanism 7 drives the valve stem 3 to move up and down; the valve plate 4 is rotatably installed on the bottom of the valve stem 3; for example, the valve plate 4 can rotate around the axis toward the downstream side through a hinge connection. When the valve plate 4 is in a vertical state, it is located between the upstream valve port 1-1 and the downstream valve port 1-2 to block the water on the downstream side, and can only rotate toward the downstream side under the action of the upstream water pressure through the limit slot 8.

[0020] Furthermore, a support device 5 is installed at the downstream side of the bottom of the valve stem 3; a vertical support track 6 is provided on the side wall of the upper cavity of the valve body 1 and located at the downstream side, and the end of the support device 5 moves along the support track 6. When the valve stem 3 is raised and lowered, the support device 5 moves up and down along the support track 6, and transmits the horizontal force generated by the rotation of the valve plate 4 to the support track 6, and then to the valve body 1.

[0021] The utility model provides a one-way pressure relief gate valve structure, which can realize functions such as two-way overflow, one-way overflow, one-way flow blocking and one-way pressure relief. Its working principle is:

[0022] 1. Free two-way flow: The valve stem operating mechanism 7 drives the valve stem 3 to rise to the position, so that the valve plate 4 is in a vertical state and fully retracted into the upper cavity of the valve body 1, forming a Figure 2 The status shown. Figure 2 In the state shown, the valve plate 4 is in the open position, and the gate valve flow channel can freely flow in both directions, that is, water can flow from the upstream valve port 1-1 to the downstream valve port 1-2, and can also flow from the downstream valve port 1-2 to the upstream valve port 1-1.

[0023] 2. One-way flow blocking:

[0024] The valve stem operating mechanism 7 drives the valve stem 3 to descend, so that the valve plate 4 is in a vertical state and is located between the upstream valve port 1-1 and the downstream valve port 1-2. At this time, the valve plate 4 is in a closed position, forming a Figure 3 The status shown. Figure 3 In the state shown, due to the effect of the limiting groove 8, the valve plate 4 cannot rotate under the effect of the downstream water pressure, and thus the downstream fluid can be blocked.

[0025] 3. One-way pressure relief and one-way overcurrent

[0026] exist Figure 3 In the state shown, when the fluid pressure on the upstream side is greater than the fluid pressure on the downstream side, the valve plate 4 rotates around the axis to the downstream side and opens to the valve plate pressure relief position, forming Figure 4 The state shown in the figure can release the pressure on the upstream side and prevent the excessive pressure on the upstream side from damaging the gate valve and causing an accident.

[0027] Therefore, the one-way pressure relief gate valve of the utility model can freely flow in both directions when the valve plate is in the open position; when the valve plate is in the closed position, it can block the downstream fluid; when the valve plate 4 is in the closed position, and the upstream fluid pressure is greater than the downstream fluid pressure, the valve plate rotates around the axis toward the downstream side to open to the valve plate pressure relief position, and the upstream fluid flows to the downstream side, thereby releasing the upstream pressure, achieving upstream fluid pressure relief, and preventing the upstream pressure from being too large to damage the gate valve and cause an accident. The valve plate rotation angle is adaptive according to the upstream and downstream pressure difference. The gate valve structure can realize functions such as two-way flow, one-way flow, one-way flow blocking and one-way pressure relief.

[0028] The utility model provides a one-way pressure relief gate valve structure, comprising a valve body, a valve cover, a valve stem, a valve plate, a supporting device, and a supporting track. The valve plate and the valve stem are hingedly connected by an axis, and the valve plate can rotate around the axis. A guide supporting device is provided at the bottom of the valve stem. When the valve stem is lifted up and down, the valve plate and the supporting device are driven to lift up and down, thereby realizing the opening and closing of the flow channel by the valve plate.

[0029] The utility model provides a one-way pressure relief gate valve structure, which can realize functions such as two-way flow, one-way flow, one-way flow blocking and one-way pressure relief; the gate valve plate can freely flow in two directions when it is opened; it can conduct one way when the valve plate is closed, which can not only meet the needs of blocking the downstream side fluid, but also ensure that when the upstream side fluid pressure is greater than the downstream side fluid pressure, it can automatically, timely and completely release the pressure, and prevent the gate valve from being damaged due to pressure exceeding the design pressure and causing accidents. Therefore, it is easy to operate, safe and reliable, and economically reasonable. When blocking the downstream side fluid, in case the upstream side fluid pressure is greater than the downstream side fluid pressure, the upstream side fluid pressure can be released in time and completely to ensure safety.

[0030] The embodiments described above are only used to illustrate the technical ideas and features of the utility model, and their purpose is to enable technicians in the field to understand the content of the utility model and implement it accordingly. The patent scope of the utility model cannot be limited only by this embodiment, that is, any equivalent changes or modifications made to the spirit disclosed by the utility model still fall within the patent scope of the utility model.

Claims

1. A one-way pressure relief gate valve structure, characterized in that: It comprises a valve body (1), a valve cover (2), a valve stem (3), a valve plate (4) and a valve stem operating mechanism (7); One end of the valve body (1) is an upstream valve port (1-1), and the other end is a downstream valve port (1-2); the upstream valve port (1-1) and the downstream valve port (1-2) are connected to form a flow passage; the valve cover (2) is arranged on the upper part of the valve body (1), and the upper cavity of the valve body (1) is connected to and perpendicular to the flow passage; the valve stem (3) is arranged in the upper cavity of the valve body (1) and is perpendicular to the flow passage, and the valve stem operating mechanism (7) is installed on the top of the valve stem (3); the valve stem operating mechanism (7) drives the valve stem (3) to move up and down; the valve plate (4) is rotatably installed on the bottom of the valve stem (3); when the valve plate (4) is in a vertical state, it is located between the upstream valve port (1-1) and the downstream valve port (1-2) to block the water on the downstream side, and can only rotate toward the downstream side under the action of the upstream water pressure through the action of the limit slot (8).

2. A one-way pressure relief gate valve structure according to claim 1, characterized in that: A supporting device (5) is installed on the downstream side of the bottom of the valve stem (3); a vertical supporting track (6) is provided on the side wall of the upper cavity of the valve body (1) and located on the downstream side, and the end of the supporting device (5) moves along the supporting track (6).

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