Design scheme of membrane structure valve controlled by fluid pressure

Abstract

The invention discloses a valve design scheme of a membrane type structure controlled by fluid pressure. According to the valve design scheme, liquid or gas is used as a power carrier for controlling the valve, a diaphragm assembly is controlled to move, and the valve function is achieved. A tubular valve body (1) is arranged, a bowl-shaped cylinder body is arranged in the middle of the valve body, the cylinder body and the valve body are integrated, and the space between the cylinder body and the valve body is hollowed out for fluid after the valve is opened to pass through; a small through hole d is formed in the valve body and penetrates to the center of the bowl-shaped cylinder body, a bowl-shaped membrane (3) is arranged in the valve body, the membrane and a rigid plug (4) are combined and fixed, the membrane (3) and the valve body (1) form three spaces, a channel of the flow-limiting valve part (2) and a valve body inlet are an inlet space a, and the space from the flow-limiting valve part to a valve body outlet is a space b. The inner wall of the cylinder and the membrane form a space c, a hole d is formed in the inner side face of the cylinder close to the bottom and leads to the outside of the valve body, liquid or gas capable of pushing the membrane to close the valve can be injected through the hole d, or liquid or gas in the space c is released to open the valve.

Description

Technical Field

[0001] The invention relates to a valve, and its application field is a wide range of fluid applications, such as oil pipeline transportation, natural gas pipeline transportation, tap water pipeline transportation, etc. and terminal switch control thereof. Background Art

[0002] In production and life, every family must use at least three valves, such as the main valve for tap water entering the house, one valve for hot and cold water in the house, and many families have installed natural gas, so they also need a natural gas valve. There are four common valves available. One is the ball valve, which uses the principle of turning a perforated ball to open and close. It has a simple structure and low price, but its disadvantages are also very obvious. In high-pressure pipelines, it is very difficult to open and close, and its service life is short. Therefore, it is only suitable for use in medium and low pressure pipelines that are not frequently opened and closed. The second is the stop valve, which uses the principle of blocking. It has the widest range of uses, and it also has a simple structure and small size. The disadvantage is that it has a short service life and often requires force to be completely closed. Each opening or closing operation will cause damage to the valve core and screw threads. The third is the butterfly valve, which rotates a round metal plate To open and close, it has high requirements on manufacturing precision. It is the smallest valve in volume relative to the pipeline. In large pipelines, it often uses a force-added torque-changing device. It is only used in industrial pipelines. The fourth type is the gate valve. The principle is to lift a rectangular metal plate to open and close the pipeline. Each switch will cause damage to the valve and the lifting screw. The above valves have electric and manual versions. The electric ones are driven by the installed motor, which is expensive, the manual ones have a short lifespan, and are inconvenient to operate. Especially for valves installed in wells or pipelines that are easily soaked in water, it is even more inconvenient to use. For this reason, I invented a valve design scheme with a hydraulic control structure that can solve these pain points. Summary of the invention

[0003] A valve design scheme with a diaphragm structure and fluid pressure control adopts a diaphragm assembly in which a plug and a soft membrane are set in the valve body. The plug is pushed open by the pressure of the fluid in the pipeline, and the valve is opened. When the valve needs to be closed, the diaphragm assembly is driven by hydraulic pressure, and the diaphragm pushes the rigid plug tightly combined in front of the diaphragm to close the valve. In order to facilitate the manufacturer to implement this design scheme, it is now explained one by one with reference to the drawings in the specification.

[0004] A valve design scheme with a diaphragm structure and fluid pressure control is a valve design scheme that uses liquid or gas as a power carrier to drive the diaphragm assembly to move, thereby achieving the valve function. The present invention provides a tubular valve body ①, and a flow limiting component ② is provided at the middle of the valve body. The flow limiting component can allow the valve to generate a pressure difference between the inlet space a and the outlet space b when the valve is in an open state. A bowl-shaped cylinder body is provided in the middle of the valve body, and the cylinder body and the valve body are integrated. The valve body of the cylinder body is hollowed out for the fluid to pass through after the valve is opened. A bowl-shaped diaphragm ③ is provided in the valve body, and the diaphragm is combined and fixed with a rigid plug ④. The diaphragm and the valve body construct three spaces. The channel of the flow limiting valve component ② and the inlet of the valve body are the inlet space a, and the space from the flow limiting valve component to the outlet of the valve body is the outlet space b. The inner wall of the cylinder and the membrane construct space c, and a hole d is provided on the inner side of the cylinder close to the bottom to lead to the outside of the valve body. Liquid or gas that can push the diaphragm to close the valve can be injected through the hole d, or liquid or gas in the c space can be discharged to open the valve.

[0005] Now, the working process of the valve is explained in conjunction with the attached drawings. A valve manufactured by a diaphragm structure using a valve design scheme controlled by fluid pressure has a working condition, that is, the valve inlet a must have a sufficiently high pressure to generate a pressure difference at both ends of the plug assembly to push the plug to move to open the valve. Assuming that the valve is in Figure 1 In the open state shown in the figure, if we want to close the valve, we can inject liquid or gas with a pressure not lower than that of the inlet space a into the space c in the cylinder through the hole d on the valve body ①. The pressure generated by the liquid or gas on one end of the diaphragm ③ in the space c is greater than the pressure generated on the plug at the end of the inlet space a. The resulting pressure difference pushes the plug assembly to move toward the direction of the space a. The valve gradually closes as the plug moves, and finally the valve closes, as shown in the figure below. Figure 1 As shown in the figure, if you want to keep the state, you only need to plug hole d, and the valve state will enter the holding state. If the valve is to be opened, connect hole d with the low-pressure space, and the fluid pressure in the cylinder space c will be reduced. When the pressure generated by the plug ④ end is greater than the pressure generated on the diaphragm at the c space end, the plug ④ will move to the space c end, and the valve will open. Figure 3 shown.

[0006] Implementation plan 1: A through hole can be opened in the inlet space a, and the through hole is connected to the hole d by a tube. A push switch S1 is arranged between the through hole and the hole d. When the switch S1 is pressed, the through hole is connected to the hole. Since there is a pressure difference between the inlet space a and the outlet space b, a pressure that pushes the diaphragm assembly to move toward the inlet direction is generated on the diaphragm. Therefore, the d hole can be used as a functional hole for closing the valve. At the same time, a through hole can be opened in the outlet space c. Similarly, a through hole is connected to the hole d by a tube, and a push switch S2 is arranged between the two holes. When the push switch S2 is pressed, the through hole is connected to the hole d. Since the pressure of the space c is the same as the pressure of the outlet space b, the pressure of the inlet space a is higher than the pressure of the outlet space b, a pressure difference is generated at both ends of the plug to push the plug to move in the direction of the outlet space b, and the valve is opened. Therefore, the d hole is also a functional hole for opening the valve. In addition, the switches S1 and S2 should be able to reset automatically after being pressed and released. After resetting, the switch is in a closed state, that is, the functional hole d is closed. After closing the hole d, the valve state remains unchanged until the switch S1 or S2 is pressed down. Figure 5 shown.

[0007] Implementation Plan 2: The implementation method can also use compressed air or high-pressure liquid to inject into the d hole to close the valve, or set a mechanical hydraulic device to connect with the d hole to close the valve. To open the valve, it only needs to release the pressure of the c space through the d hole, and the fluid in the pipeline will push the valve plug to open the valve. Figure 6 As shown, a hollow tube is used to connect the hole d with the isolation valve S, and the isolation valve S is then connected to the fluid driving source T through the hollow tube. As long as the isolation valve S is opened, the fluid driving source T changes the pressure of the space c through the connected hollow tube, and drives the diaphragm ④ to close or open the valve. At the same time, this solution can be used as the execution terminal control of the pneumatic system and the hydraulic system. The above implementation method can be selected according to actual needs. Figure 6 A schematic diagram of the scheme is shown below.

[0008] Figure 1 This is a cross-sectional view of the valve in closed state. Figure 2 This is a sectional view of the valve in the closed state. Figure 3 This is a cross-sectional view of the valve in the open state. Figure 4 This is a three-dimensional diagram of the diaphragm assembly. Figure 5 This is a schematic diagram of implementation plan 1. Figure 6 This is a schematic diagram of implementation plan 2.

[0009] a---valve inlet space, b---valve inlet space, c---cylinder space, d----valve control hole, S1----closing valve, S2----opening valve, S----isolating valve, T-----fluid driving source.

[0010] ① is the valve body, ② is the inlet flow limiting valve component, ③ is the diaphragm, and ④ is the plug assembly.

Claims

1. Claim 1: The feature of the present invention is that a cylinder is arranged in the middle of the valve body ①, the cylinder and the valve body are integrated into one body, there is a hollow hole between the cylinder and the valve body, so that the fluid can pass through the valve when the valve is in the open state, a flow limiting port ② is arranged at the inlet of the valve body, the function of the flow limiting port is to generate a pressure difference between the inlet space a and the outlet space b when the valve is in the open state, a soft membrane ④ is arranged between the flow limiting port and the cylinder, the soft membrane is tightly combined with the cylinder to form a closed space c relative to the outlet space b, the soft membrane is integrated with the valve plug ③ arranged in the valve, a small hole d is arranged on the cylinder, and the small hole d is communicated with the space c.

2. Claim 2: As described in claim 1, the present invention is characterized in that a soft membrane ④ is provided between the flow restriction port and the cylinder body.

3. Claim 3: As described in claim 1, the feature of the present invention is that the soft membrane is tightly combined with the cylinder body to form a closed space c relative to the outlet space b, and the soft membrane ④ is integrated with the valve plug ③ arranged in the valve, and the soft membrane will push the valve plug ③ to close the valve or open the valve according to the pressure difference on both sides of the soft membrane.

4. Claim 4: As described in claim 1, the feature of the present invention is that a small hole d is provided on the cylinder body, and the small hole d is communicated with the space c.

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