Bidirectional monostable open-circuit self-locking electromagnetic valve

Abstract

The utility model relates to a normally-closed electromagnetic valve, in particular to a bidirectional monostable open-circuit self-locking electromagnetic valve, which is characterized in that when the valve is in an open-circuit state, fluid is introduced into any one of two interfaces of the valve, the valve can be locked by the pressure of the fluid, and leakage is avoided, namely, the valve has a bidirectional open-circuit self-locking function; the electromagnetic valve is mainly composed of a valve body, a valve element, a pre-tightening spring and an electromagnetic coil, the valve body is divided into an upper cavity and a lower cavity, the electromagnetic coil and the pre-tightening spring are installed in the upper cavity, two gas circuit connectors and two valve seats are arranged in the lower cavity, an armature and two valves are manufactured on the valve element, the valve element penetrates through the upper cavity and the lower cavity of the valve body to be installed in the valve body, the armature is located in the electromagnetic coil, and the valve seat is located in the valve body. A pre-tightening spring is installed at the upper end of the armature, the valves are matched with a valve seat on the valve body, and a reasonable interlayer is arranged on the valve body, so that the pressure difference of gas acting on the upper surfaces and the lower surfaces of the two valves is always consistent with the direction in which the valves press towards the valve seat, and circuit break self-locking is achieved.

Description

Technical Field

[0001] This utility model relates to a normally closed solenoid valve. When the valve is in the open circuit state, gas can be introduced into either of the two ports of the valve, and the gas pressure can lock the valve and prevent leakage, thus having a bidirectional open circuit self-locking function. Background Technology

[0002] Solenoid valves are crucial components in fluid control, widely used in pneumatic, hydraulic, water supply, gas supply, and oil supply pipeline systems. Their application is extremely widespread and numerous. For simplicity, the normally closed solenoid valve will be described using gas as the working medium. Its working principle is as follows: When the solenoid coil is not energized, the valve is pressed against the valve seat by the preload spring. When gas is introduced through the inlet, the inlet pressure acts in the same direction as the valve pressing against the valve seat, keeping the solenoid valve in a closed-circuit, self-locking state. When current is applied to the solenoid coil, a magnetic force is generated, driving the valve away from the valve seat, opening the gas path, and placing the solenoid valve in the open state. If the air intake direction is changed and gas is introduced from the opposite direction, the direction of gas pressure is opposite to the direction in which the valve presses against the valve seat. When the gas pressure is greater than the preload of the preload spring, the valve will move away from the valve seat even when the solenoid coil is not energized, and the air passage will open, making it impossible to maintain the closed state. Therefore, this type of solenoid valve has directional restrictions when used and cannot be installed arbitrarily. In addition, if the air intake pressure is unexpectedly lost when using this type of solenoid valve alone, and the air outlet pressure is high, it may force the valve open in the reverse direction, causing gas leakage. Summary of the Invention

[0003] To address the issues of conventional normally closed solenoid valves requiring installation in a specific orientation and the potential reverse leakage of gas when used alone due to the loss of inlet pressure, a bidirectional monostable self-locking solenoid valve is proposed.

[0004] The technical solution adopted by this utility model to solve the technical problem is as follows: Two coaxial valves are installed on the valve core, each with a different upper and lower surface area. By setting a reasonable partition on the valve body, when air flows in the inlet direction, the gas pressure acts on the upper and lower surfaces of the two valves respectively, generating upward and downward pressures. Due to the different surface areas of the two valves, a pressure difference will be generated. When the generated pressure difference is consistent with the direction in which the valve presses against the valve seat, it achieves circuit breaking and self-locking. The greater the pressure, the greater the locking force. Similarly, when air flows in the reverse direction, the gas pressure acts on the lower and upper surfaces of the two valves respectively, and the generated pressure difference is also consistent with the direction in which the valve presses against the valve seat, achieving circuit breaking and self-locking.

[0005] The advantages of this utility model are: firstly, it solves the problem that normally closed solenoid valves need to be installed in a specified direction, reducing the workload of workers; secondly, when using this solenoid valve in a pipeline system, there is no need to set up a check valve, reducing the complexity of the system and the cost of use. Attached Figure Description

[0006] The present utility model will be further described below in conjunction with the drawings and embodiments. Figure 1 It is a schematic structural view of the initial state of this solenoid valve. Figure 2 It is a schematic structural view of the working state of this solenoid valve. Component labels in the figure: 1. Valve body, 2. Spool, 3. Preloading spring, 4. Electromagnetic coil, 101. Upper valve seat, 102. Lower valve seat, 200. Armature, 201. Upper valve, 202. Lower valve. Specific embodiments

[0007] Figure 1 This is a specific embodiment of the bidirectional monostable open-circuit self-locking solenoid valve described in the present utility model. As shown in the figure, this valve consists of a valve body 1, a spool 2, a preloading spring 3, and an electromagnetic coil 4. A and B on the valve body 1 are gas path interfaces for connecting to the gas path. The functions of A and B can be interchanged. A is the air inlet, corresponding to B as the air outlet; or A is the air outlet, corresponding to B as the air inlet.

[0008] As Figure 2 shown, the valve body 1 is divided into upper and lower chambers. The lower chamber is provided with a horizontally arranged "ji" - shaped structure, which divides the lower cavity into two gas chambers I and J. Upper valve seat 101 and lower valve seat 102 are respectively manufactured on the two horizontal planes of the "ji" - shaped structure. The side of the valve seat is in the shape of an inverted cone, and the upper and lower valve seats are coaxially arranged. The upper chamber of the valve body 1 is installed with an electromagnetic coil 4. The spool 2 is installed inside the valve body 1. An armature 200 is manufactured on the upper part of the spool 2, and upper valve 201 and lower valve 202 are manufactured in the middle and lower parts. The sides of the upper and lower valves are in the shape of an inverted cone, and the conical surfaces exactly match the inverted conical surfaces of the upper valve seat 101 and lower valve seat 102 on the valve body 1. When the valve seat and the valve are in contact, the inverted conical surfaces can form a surface seal. The armature 200 is inside the electromagnetic coil 4. A preloading spring 3 is installed at the upper end of the armature 200, and the preloading spring 3 presses the entire spool 2 downward.

[0009] When the solenoid valve is in the initial state (as Figure 1As shown), the preload spring 3 on the upper part of the valve core 2 is pressed against the armature 200, pushing the entire valve core 2 downward, so that the upper valve 201 and the lower valve 202 are tightly fitted with the conical surfaces of the upper valve seat 101 and the lower valve seat 102, so that the air chamber I and the air chamber J are separated and not connected. When A is the air inlet and B is the air outlet, and pressurized gas is introduced into port A, assuming the pressure in air chamber I is P, because the upper and lower valves and the upper and lower valve seats are sealed by conical surfaces, the conical surfaces of the upper valve 201 and the lower valve 202 are not subjected to pressure. The pressure only acts on the lower surface of the upper valve 201 and the upper surface of the lower valve 202. Since the area of ​​the lower surface of the upper valve 201 is smaller than the area of ​​the upper surface of the lower valve 202, the upward pressure on the lower surface of the upper valve 201 is less than the downward pressure on the upper surface of the lower valve 202. Therefore, the pressure on the entire valve core 2 is downward. With the downward pressure of the preload spring 3, the upper valve 201 and the lower valve 202 are pressed against the upper valve seat 101 and the lower valve seat 102 and remain closed, achieving self-locking in the positive circuit break state. Similarly, when B is the air inlet and A is the air outlet, and pressurized gas is introduced into the B port, assuming the pressure in the air chamber J is P, because the upper and lower valves and the upper and lower valve seats are sealed by conical surfaces, the conical surfaces of the upper valve 201 and the lower valve 202 are not subjected to pressure. The pressure only acts on the upper surface of the upper valve 201 and the lower surface of the lower valve 202. Since the upper surface area of ​​the upper valve 201 is larger than the lower surface area of ​​the lower valve 202, the downward pressure on the upper surface of the upper valve 201 is greater than the upward pressure on the lower surface of the lower valve 202. In addition, with the downward pressure of the preload spring 3, the entire valve core 2 is subjected to downward force, which makes the upper valve 201 and the lower valve 202 fit against the upper valve seat 101 and the lower valve seat 102 and remain closed, realizing self-locking in the reverse circuit breaking state, that is, it can realize bidirectional circuit breaking self-locking.

[0010] like Figure 2 As shown, when current is applied to the electromagnetic coil 4, the electromagnetic force attracts the armature 200, overcoming the combined downward force of the pressure of the preload spring 3 and the gas acting on the two valves. The armature 200 moves upward, causing the upper valve 201 and lower valve 202 to separate from the upper valve seat 101 and lower valve seat 102. The conical surfaces of the upper valve 201 and lower valve 202 are no longer sealed, and the solenoid valve becomes open. When it is necessary to close the solenoid valve again, the current to the electromagnetic coil 4 is cut off, the electromagnetic force disappears, the preload spring 3 releases its pressure, and pushes the armature 200 downward. The armature 200 causes the upper valve 201 and lower valve 202 to move downward and then fit against the upper valve seat 101 and lower valve seat 102. The upper and lower valves and the conical surfaces of the upper and lower valve seats reseal, returning to the initial state and entering a self-locking state.

[0011] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A bidirectional monostable self-locking solenoid valve, characterized in that: The solenoid valve consists of a valve body, a valve core, a pre-tightening spring, and an electromagnetic coil. The valve body is divided into upper and lower chambers. The upper chamber is equipped with an electromagnetic coil and a pre-tightening spring. The lower chamber has 2 gas path interfaces and 2 valve seats. The valve core is provided with an armature and 2 valves. The valve core is installed in the valve body through the upper and lower chambers of the valve body. The armature is located inside the electromagnetic coil. The pre-tightening spring is installed at the upper end of the armature. The valves are matched with the valve seats on the valve body.

2. The bidirectional monostable self-locking solenoid valve as described in claim 1, characterized in that: The lower chamber has a horizontally placed "ji" - shaped structure, which divides the lower cavity into two gas chambers.

3. The bidirectional monostable self-locking solenoid valve as described in claim 1, characterized in that: The upper valve seat and the lower valve seat are respectively made on two horizontal planes of the "ji" - shaped structure. The side surface of the valve seat is in the shape of an inverted cone, and the upper and lower valve seats are coaxially arranged.

4. The bidirectional monostable self-locking solenoid valve as described in claim 1, characterized in that: The upper part of the valve core is provided with an armature, and the middle and lower parts are provided with an upper valve and a lower valve. The side surface of the valve is in the shape of an inverted cone, and the conical surface completely coincides with the inverted conical surfaces of the upper valve seat and the lower valve seat on the valve body. When the valve seat and the valve are in contact, the inverted conical surface can form a surface seal.

5. The bidirectional monostable self-locking solenoid valve as described in claim 1, characterized in that: Under the action of the pre-tightening spring, the whole valve core is pushed downward, and the upper valve, the lower valve are closely fitted with the conical surfaces of the upper valve seat and the lower valve seat.

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