A normally closed structure for a water hammer relief exhaust valve

Abstract

The utility model relates to a kind of for preventing closing water hammer admission and exhaust valve's normally closed structure, belong to composite admission and exhaust valve technical field, including cylinder and open-close component, the cylinder inner wall is provided with limit part;Open-close component is set in the cylinder interior, the open-close component includes rotating plate, pivot and torsion spring, the pivot is horizontally connected in cylinder cylinder wall, the pivot is horizontally set in the rotating end of rotating plate, the rotating plate is equipped with air hole, the torsion spring is sleeved on pivot shaft body, the end of torsion spring acts on rotating plate bottom surface, the rotating plate is in the state of abutting to limit part bottom portion.The utility model relates to a kind of for preventing closing water hammer admission and exhaust valve's normally closed structure, simple structure, it is convenient to dismount, can change open-close state according to water pipeline internal pressure, to change airflow flow area, effectively inhibit the generation of closing water hammer.

Description

Technical Field

[0001] This utility model relates to the field of composite air intake and exhaust valve technology, and in particular to a normally closed structure for an air intake and exhaust valve used to prevent water hammer. Background Technology

[0002] In water transmission pipeline systems, water hammer is one of the main causes of pipeline failure. In particular, the bridging water hammer phenomenon occurs when the pressure in the pipeline drops sharply due to valve misoperation or emergency pump shutdown, creating a vapor cavity inside the liquid. Subsequent water flow generates a shock pressure wave the moment the cavity collapses. This high-frequency pressure oscillation can easily lead to major accidents such as pipeline rupture and valve damage.

[0003] Traditional composite inlet and outlet valves, as key devices for pipeline pressure regulation, generally adopt a float-type one-way opening and closing structure. Although this type of valve can achieve gas discharge and gas replenishment functions under normal operating conditions, it has obvious defects when dealing with transient pressure changes: First, the fixed orifice exhaust channel cannot adapt to the exhaust demand at different flow rates, and high-speed airflow can easily cause the float to oscillate and become unstable; Second, during the stage of sudden pressure drop in the pipeline, the existing structure lacks active control over the gas discharge rate, and an excessively fast exhaust rate will exacerbate negative pressure fluctuations, forming a vicious cycle.

[0004] Therefore, there is an urgent need to develop an intake and exhaust valve structure with dynamic adjustment function, which can achieve a smooth transition of pressure fluctuations by matching the exhaust cross-sectional area and fluid kinetic energy in real time, thereby effectively suppressing the generation of water hammer. Utility Model Content

[0005] The purpose of this invention is to provide a normally closed structure for an air intake and exhaust valve for preventing water hammer, which aims to adjust the exhaust cross-sectional area according to the working conditions to achieve a smooth transition of pressure fluctuations, thereby suppressing the generation of water hammer.

[0006] This utility model provides a normally closed structure for an anti-water hammer inlet / outlet valve, which adopts the following technical solution: A normally closed structure for an anti-water hammer inlet / outlet valve includes, The cylindrical body has a limiting part provided on its inner wall; An opening and closing assembly is disposed inside the cylinder. The opening and closing assembly includes a rotating plate, a rotating shaft, and a torsion spring. The rotating shaft is horizontally rotatably connected to the cylinder wall and is horizontally disposed at the rotating end of the rotating plate. The rotating plate has a vent hole. The torsion spring is sleeved on the rotating shaft and the end of the torsion spring acts on the bottom surface of the rotating plate. The rotating plate is in a state of abutting against the bottom of the limiting part.

[0007] Preferably, the rotating plate includes a unit plate, the unit plate is provided with two sets, and the vent holes are formed on the surface of the unit plate; The rotation axis of the two sets of unit plates is consistent with the central axis of the rotating shaft, and each set of unit plates is provided with a sleeve fitted onto the rotating shaft body.

[0008] Preferably, the limiting part is an annular protrusion surrounding the periphery of the cylinder.

[0009] Preferably, the cylinder and the limiting part are integrally pressed and formed.

[0010] Preferably, the rotating shaft is a screw, and a nut is threadedly connected to one end of the rotating shaft that extends out of the cylinder.

[0011] Preferably, the bottom end of the cylinder is provided with a horizontal mounting base.

[0012] In summary, this utility model has the following beneficial technical effects: 1. The structure in this application is used as the inlet and outlet of the air inlet and outlet valve. A rotating plate is provided inside the cylinder. The rotating plate is rotatably connected to the cylinder through a rotating shaft. Under the action of the torsion spring and the limiting part, the rotating plate is in a horizontal state. A vent hole is opened on the surface of the rotating plate. When the water flow in the water supply pipeline generates an impact pressure wave, the air in the water supply pipeline is discharged from the vent hole. At this time, the rotating plate is in a horizontal state, and the air only flows through the vent hole. When the outside air enters the water supply pipeline, the airflow in the water supply pipeline overcomes the resistance of the torsion spring, thereby causing the rotating plate to rotate downward. At this time, the rotating plate is in an open state, thereby increasing the gas flow area.

[0013] 2. The cylinder and the limiting part in this application are integrally pressed and formed, and the rotating shaft is a screw that can be detachably installed on the cylinder and fixed by a nut, which facilitates mass production and rapid installation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a normally closed structure for an anti-water hammer inlet and outlet valve provided by this utility model. Figure 2 This is a schematic diagram to show the internal structure of the cylinder; Figure 3 This is a schematic diagram of the application structure when the rotating plate is in a horizontal state; Figure 4 This is a schematic diagram of the application structure when the rotating plate is in a rotating state.

[0015] Explanation of reference numerals in the attached drawings: 1. Cylinder body; 11. Limiting part; 2. Opening and closing assembly; 21. Rotating plate; 211. Unit plate; 212. Vent hole; 213. Sleeve; 22. Rotating shaft; 221. Nut; 23. Torsion spring; 3. Base; 4. Inlet and outlet valve. Detailed Implementation

[0016] The following is in conjunction with the appendix Figure 1-4This utility model will be described in further detail.

[0017] This utility model provides a normally closed structure for an anti-water hammer inlet / outlet valve. (Refer to...) Figure 1 and Figure 2 A normally closed structure for an air intake and exhaust valve used to prevent water hammer is disclosed, comprising a cylinder 1 and an opening and closing assembly 2. The opening and closing assembly 2 is disposed inside the cylinder 1 and has a vent hole 212. The cylinder 1 is vertically installed at the air intake and exhaust port of the air intake and exhaust valve 4. When the water flow in the water supply pipeline generates an impact pressure wave, the air in the water supply pipeline is discharged through the vent hole 212. At this time, the rotating plate 21 is in a horizontal state, and the air only flows through the vent hole 212. When outside air enters the water supply pipeline, the opening and closing assembly 2 is in the open state, thereby increasing the gas flow area and effectively preventing the phenomenon of water hammer.

[0018] Reference Figure 1 and Figure 3 The opening and closing assembly 2 includes a rotating plate 21, a rotating shaft 22, and a torsion spring 23. In this embodiment, the cylinder 1 is preferably set to a cylindrical shape. When the rotating plate 21 is horizontal, the rotating plate 21 is in the shape of a circular plate. The rotating plate 21 includes two sets of unit plates 211, which are semi-circular in shape. Ventilation holes 212 are opened on the surface of the unit plates 211. The ends of the two sets of unit plates 211 that are close to each other are rotating ends. The rotation axis of the two sets of unit plates 211 is consistent with the central axis of the rotating shaft 22. Each set of unit plates 211 is provided with a sleeve 213 fitted onto the shaft of the rotating shaft 22. The rotating ends of the two sets of unit plates 211 are provided with sleeves 213 for the rotating shaft 22 to pass through horizontally. The rotating shaft 22 is horizontally rotatably connected to the wall of the cylinder 1. A torsion spring 23 is fitted onto the shaft of the rotating shaft 22. In this embodiment, the torsion spring 23 is located at the center of the rotating shaft 22. The ends of the torsion spring 23 act on the bottom surface of the unit plates 211. A limiting part 11 is provided on the inner wall of the cylinder 1. Under the action of the torsion spring 23, the edge of the unit plate 211 is in a state of abutting against the bottom of the limiting part 11.

[0019] Reference Figure 1 The limiting part 11 is an annular protrusion arranged around the periphery of the cylinder 1. The cylinder 1 and the limiting part 11 are integrally pressed and formed, which facilitates the mass production of the cylinder 1. In this embodiment, the rotating shaft 22 is a screw, and one end of the rotating shaft 22 that protrudes from the cylinder 1 is threadedly connected to a nut 221, which facilitates disassembly and assembly.

[0020] Reference Figure 2 and Figure 4The bottom end of the cylinder 1 is fixedly connected to the mounting base 3, and the cylinder 1 is fixedly installed at the inlet and outlet ports of the inlet and outlet valve 4 through the mounting base 3. When the water flow in the water supply pipeline generates an impact pressure wave, the air in the water supply pipeline is discharged from the vent 212, and the unit plate 211 is pushed by the airflow. At this time, the rotating plate 21 is in a horizontal state, and the air only flows through the vent 212. When the outside air enters the water supply pipeline, the airflow in the water supply pipeline overcomes the resistance of the torsion spring 23, thereby causing the unit plate 211 to rotate downward. At this time, the unit plate 211 is in an open state, thereby increasing the gas flow area.

[0021] The principle of this utility model for a normally closed structure of an anti-water hammer inlet and outlet valve is as follows: In its natural state, the two sets of unit plates 211 abut against the bottom of the limiting part 11 under the torsion spring 23, that is, both sets of unit plates 211 are in a horizontal state; at the initial stage of pumping in the water pipeline, due to the low water flow velocity and low air flow velocity in the water pipeline, the air in the water pipeline is discharged to the external environment through the inlet cylinder 1 and the vent 212; as the water flow velocity in the water pipeline increases, the air in the water pipeline quickly rushes towards the cylinder 1. Unit plate 211 remains horizontal under the action of airflow, meaning that airflow is only discharged to the external environment through vent 212, thereby limiting the air discharge speed in the water pipeline and maintaining stable pressure changes in the water pipeline, thus reducing the occurrence of water hammer. When external air enters the water pipeline, the airflow in the water pipeline overcomes the resistance of torsion spring 23, causing unit plate 211 to rotate downward. At this time, unit plate 211 is in an open state, thereby increasing the gas flow area and promoting the inflow of airflow.

[0022] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A normally closed structure for an anti-water hammer inlet / outlet valve, characterized in that, include, A cylindrical body (1) has a limiting part (11) provided on the inner wall of the cylindrical body (1). The opening and closing assembly (2) is located inside the cylinder (1). The opening and closing assembly (2) includes a rotating plate (21), a rotating shaft (22), and a torsion spring (23). The rotating shaft (22) is horizontally rotatably connected to the cylinder wall of the cylinder (1). The rotating shaft (22) is horizontally located at the rotating end of the rotating plate (21). The rotating plate (21) has a vent hole (212). The torsion spring (23) is sleeved on the shaft of the rotating shaft (22). The end of the torsion spring (23) acts on the bottom surface of the rotating plate (21). The rotating plate (21) is in a state of abutting against the bottom of the limiting part (11). During exhaust, air is discharged only from the vent (212) to limit the exhaust speed; during intake, the airflow overcomes the resistance of the torsion spring (23) to make the rotating plate (21) rotate downward to increase the gas flow area.

2. The normally closed structure for an anti-water hammer inlet / outlet valve according to claim 1, characterized in that, The rotating plate (21) includes a unit plate (211), which is provided with two sets, and the ventilation holes (212) are opened on the surface of the unit plate (211); The rotation axis of the two sets of unit plates (211) is consistent with the central axis of the rotating shaft (22), and the two sets of unit plates (211) are respectively provided with sleeves (213) fitted onto the shaft body of the rotating shaft (22).

3. The normally closed structure for an anti-water hammer inlet / outlet valve according to claim 1, characterized in that, The limiting part (11) is an annular protrusion surrounding the periphery of the cylinder (1).

4. The normally closed structure for an anti-water hammer inlet / outlet valve according to claim 3, characterized in that, The cylinder (1) and the limiting part (11) are integrally pressed and formed.

5. A normally closed structure for an anti-water hammer inlet / outlet valve according to claim 1, characterized in that, The rotating shaft (22) is a screw, and a nut (221) is threaded to one end of the rotating shaft (22) that protrudes from the cylinder (1).

6. A normally closed structure for an anti-water hammer inlet / outlet valve according to claim 1, characterized in that, A horizontal mounting base (3) is provided at the bottom of the cylinder (1).

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