Direct-acting type low-power-consumption electromagnetic valve

Abstract

A direct-acting type low-power-consumption electromagnetic valve comprises a valve body, a movable iron core, a valve rod, a movable valve element, a static iron core, a sleeve, a valve cover, an installation retaining ring, a supporting frame, a spring and a T-shaped ring assembly. An air inlet and an air outlet can be formed in one side face of the valve body, and a working opening is formed in the opposite side face of the valve body; the lower end of the valve rod is provided with a lower sealing layer matched with the lower valve port in position and shape, and the upper end of the valve rod is provided with an upper sealing layer matched with the upper valve port in position and shape; in the valve body, a movable iron core drives an upper sealing layer and a lower sealing layer to move up and down so as to realize passage flow direction switching among the air inlet, the working port and the exhaust port; the valve rod is integrated with an upper sealing layer mounted at the upper end and a lower sealing layer mounted at the lower end; the static iron core is arranged on the upper portion of the sleeve, the movable iron core is arranged on the lower portion of the static iron core, the electromagnetic coil driving the movable iron core is assembled on the periphery of the lower end of the static iron core, a reset spring is arranged in the sleeve, elastic force of the reset spring downwards enables the movable iron core to be separated from the static iron core, and two guide rings are fixed to the upper position and the lower position of the sleeve and used for limiting sliding of the valve rod and the movable iron core.

Description

Technical Field

[0001] The utility model relates to the technical field of valve preparation, in particular to a low-power solenoid valve with an integrally formed sealing structure, which is used for fluid switching and flow direction switching control. Background Art

[0002] Fluids include liquids and gases, and electrically controlled valves are key devices for fluid control. When switching the flow direction and controlling the on-off, the application of electrically controlled valves is increasing. The direct-acting electrically controlled valve has the advantages of simple control, good sealing, low energy consumption and low cost when in use. The electrically controlled lift valve is a widely used valve.

[0003] CN214999661U discloses a sealing ring for a two-way sealing valve, which relates to the field of sealing rings and includes a base. A top cover is arranged on the top of the base. An outer sealing ring and an inner sealing ring are arranged between the top cover and the base. A compensation connection seat is fixedly connected to the top surface of the base. Embedding grooves are arranged on both the inner and outer sides of the compensation connection seat. Compensation air bags are fixedly connected to both the inner and outer side surfaces of the compensation connection seat. A compensation air passage is opened inside the compensation connection seat. An air inlet is opened on the compensation air passage. A sealing plate is arranged inside the air inlet. In the utility model, air is filled into the compensation air passage through the air inlet, and then the two compensation air bags are inflated by the compensation air passage, so that the outer sealing ring and the inner sealing ring can be deformed to closely adhere to the valve body, thereby being able to play a compensation role when wearing occurs and ensuring the sealing performance.

[0004] The dynamic sealing of the valve core must be used to realize the flow direction and switching of the medium in the valve. Utilizing the elastic deformation of the O-ring rubber seal is the most common sealing form (traditional sealing form), but its friction force is relatively large and it is not wear-resistant, and the performance of the rubber part is greatly affected by temperature changes. The goal of this application is a low-power solenoid valve and to meet the requirements of long working life of valves on the current market. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a direct-acting low-power solenoid valve, especially a low-power solenoid valve with an integrally formed sealing structure in a vertical structure, which has a gas pressure balance structure and can have a compensation sealing structure to seal the valve stem, with a small friction force, not affecting the working life of the valve, and capable of working with low power consumption.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A direct-acting low-power solenoid valve, comprising a valve body 1, a moving iron core 2, a valve rod 3 (connected to a moving valve core), a static iron core 4, a sleeve 5, a valve cover 6, a mounting snap ring 7, a support frame 8, a spring 9, and a T-ring assembly 10; an air inlet (fluid inlet) and an exhaust port may be provided on one side of the valve (shell) body, and a working port is provided on the opposite side of the valve (shell) body; the lower end of the valve rod 3 is installed with a lower sealing layer 1-4 that matches the shape of the lower valve port 1-5, and the upper end of the valve rod 3 is installed with an upper sealing layer 1-6 that matches the shape of the upper valve port 1-7; within the valve body, the upper and lower sealing layers are driven by the moving iron core to move up and down to achieve the switching of the flow path direction between the air inlet, the working port, and the exhaust port; the valve rod 3 and the upper sealing layer installed at the upper end and the lower sealing layer installed at the lower end are of an integrally formed structure; the static iron core 4 is at the upper part of the sleeve 5, the moving iron core is at the lower part of the static iron core, and the electromagnetic coil for driving the moving iron core is assembled at the outer periphery of the lower end of the static iron core 4. A return spring is provided within the sleeve, and the elastic force of the return spring acts downward to separate the moving iron core from the static iron core. Two guide rings are fixed at the upper and lower positions of the sleeve to limit the sliding of the valve rod and the moving iron core;

[0008] When the gas medium enters from the air inlet 1-1 and is in the non-powered (i.e., de-energized) state, the valve rod 3 is pressed against the lower valve port by the elastic force of the spring 9. At this time, the working port 1-2 of the valve body is not ventilated;

[0009] When the gas medium enters from the air inlet 1-1 and the coil assembled at the static iron core 4 is powered on, the coil generates an electromagnetic field to lift the moving iron core 2 and attract it to the static iron core 4; since the moving iron core 2 is fixedly connected to the valve rod 3, when the moving iron core 2 is lifted, the valve rod 3 will be lifted synchronously, causing the lower sealing layer 1-4 on the valve rod 3 to separate from the lower valve port 1-5, connecting the air inlet 1-1 to the working port, and the upper sealing layer 1-6 on the valve rod 3 to seal the upper valve port 1-7. The fluid (gas) medium flows through the valve port to the working port 1-2.

[0010] The lower sealing layer at the lower end of the valve rod and the upper sealing layer installed at the upper end of the valve rod adopt an integrally vulcanized structure; the valve rod 3 and the static iron core 2 are provided with central holes and are coaxial. When the valve body is ventilated but not powered on (de-energized), the gas medium passes through the central holes of the valve rod 3 and the static iron core 2 and enters the gap between the upper sleeve 5 and the static iron core 2; until the sealing part of the T-ring assembly 10 and the valve rod 3. In this structure, the downward pressure generated by the upper gas medium and the upward pressure generated by the valve port and the sealing surface achieve pressure balance. This design can reduce the force value of the spring, and ultimately it is reflected that the coil output power on the valve body can be reduced, realizing the function of lower power output, and further confirming the safety of the solenoid valve during use.

[0011] Beneficial effects: The utility model is designed in a vertical structure. For the sealing surfaces of the valve stem and the valve port (the position where the working port on the valve body is sealed), conventionally, the sealing member is processed by machining, injection molding or vulcanization, and then the sealing member and other parts are assembled (by interference fit, riveting, etc.). The sealing surface is prone to linear sealing, and it is difficult to control the flatness of the sealing surface. Considering the risk points of the conventional structure: The present invention adopts a new structure and forming method: an integrated vulcanization (or integrated injection molding of high molecular elastomer material) rubber technology ( Figure 3 ). Brief description of the drawings

[0012] Figure 1 It is a schematic cross-sectional view of the structure of the present utility model.

[0013] Figure 2 It is an enlarged cross-sectional view of the sealing surfaces of the upper and lower valve ports and the valve stem;

[0014] Figure 3 It is a structural diagram of the integrally vulcanized valve stem. Detailed implementation manners

[0015] As shown in the figure, 1: valve body, 2: moving iron core, 3: valve stem (connecting and fixing the moving iron core valve core), 4: static iron core, 5: sleeve, 6: valve cover, 7: mounting snap ring, 8: support frame, 9: spring, 10: T-ring (assembly); the air inlet 1-1 of the valve body, the working port 1-2 of the valve body, the exhaust port 1-3, the lower sealing layer 1-4 and the lower valve port 1-5, the upper sealing layer 1-6 on the valve stem 3 and the upper valve port 1-7, the joint surface 11 of the moving iron core and the static iron core.

[0016] Structure description: One side of the valve (shell) body may be provided with a fluid inlet (gas or liquid inlet) and a fluid exhaust port, and the opposite side of the valve (shell) body is provided with a working port, that is, the working port (fluid outlet); the lower end of the valve stem 3 is installed with a lower sealing layer 1-4 that matches the position and shape of the lower valve port 1-5 (opening and closing of the air inlet and the working port), and the upper end of the valve stem 3 is installed with an upper sealing layer 1-6 that matches the position and shape of the upper valve port 1-7 (opening and closing of the flow direction of the gas medium temporarily stored in the working port 1-2 to the exhaust port); the upper and lower sealing layers of the valve body are driven by the moving iron core to move up and down to realize the switching of the flow path direction between the air inlet, the working port and the exhaust port; the valve stem 3 and the upper sealing layer installed at the upper end and the lower sealing layer installed at the lower end are of an integrally formed structure; the static iron core 4 is at the upper part of the sleeve 5, the moving iron core is at the lower part of the static iron core, the electromagnetic coil for driving the moving iron core is assembled around the lower end of the static iron core 4, a return spring is arranged in the sleeve, the elastic force of the return spring makes the moving iron core separate from the static iron core downward, and two guide rings are fixed at the upper and lower positions of the sleeve to limit the sliding of the valve stem and the moving iron core; the valve port is the position where the working port on the valve body is sealed; when powered off, the working port is communicated with the exhaust port, and when powered on, the air inlet is communicated with the working port.

[0017] The valve stem mechanism (the moving iron core 2, the valve stem 3, the spring 9, the return spring near position 5, and the two guide rings installed on the moving iron core 2) will move downward due to the restoring forces of the spring 9 and the return spring. The elastic force of the return spring separates the moving iron core from the static iron core, and the lower sealing layer of the valve stem 3 reseals the valve port (the air inlet and the working port are shut off). At the same time, the upper sealing layer 1-6 on the valve stem 3 disengages from the upper valve port 1-7, allowing the gas medium temporarily stored in the working port 1-2 to flow to the exhaust port.

[0018] When the gas medium enters from the air inlet 1-1 and the coil 12 assembled at the static iron core 4 is de-energized (i.e., power-off), the valve stem 3 is pressed against the lower valve port by the elastic force of the spring 9, and at this time, the working port 1-2 of the valve body is not ventilated.

[0019] When the gas medium enters from the air inlet 1-1 and the coil assembled at the static iron core 4 is energized (power-on), the coil generates an electromagnetic field to lift the moving iron core 2 and attract it to the static iron core 4; since the moving iron core 2 and the valve stem 3 are fixed by a threaded connection, when the moving iron core 2 is lifted, the valve stem 3 will be lifted synchronously, causing the lower sealing layer 1-4 on the valve stem 3 to separate from the lower valve port 1-5, and the upper sealing layer 1-6 on the valve stem 3 to seal with the upper valve port 1-7, and the gas medium flows through the valve port to the working port 1-2.

[0020] When the gas medium flows from the air inlet 1-1 to the working port 1-2 (working state), the power supply to the coil at the static iron core 4 is disconnected (power-off state), and the valve stem mechanism (the moving iron core 2, the valve stem 3, the spring 9, the return spring near the position of the sleeve 5, and the two guide rings installed on the moving iron core 2) will move downward due to the restoring forces of the spring 9 and the return spring. The lower sealing layer 1-4 on the valve stem 3 reseals with the lower valve port 1-5. At the same time, the upper sealing layer 1-6 on the valve stem 3 disengages from the upper valve port 1-7, allowing the gas medium temporarily stored in the working port 1-2 to flow to the exhaust port 1-3.

[0021] For the sealing surfaces of the valve stem and the valve port, the conventional method is that the sealing parts are processed by machining, injection molding, or vulcanization, and then the sealing parts are assembled with other parts (by interference fit, riveting, etc.). The sealing surface will show line-line sealing, and it is very difficult to control the flatness of the sealing surface. Considering the risk points of the conventional structure: This application adopts a new structure and forming method. Since the valve stem structure is prepared by integrally vulcanizing the upper and lower sealing layers with uniform thickness, the sealing layer and the valve port sealing surface are very flat, and it is also very easy to control this flatness; in addition, when vulcanizing the upper and lower sealing layers, there are some through holes in the middle of this metal insert (the valve stem and the machining surface of the valve stem in the sealing layer), and these through holes are also integrally formed when the sealing material is formed, and the anti-disconnection function is carried out between the upper and lower sealing layers.

[0022] Meanwhile, before the sealing layer is formed, the bonding surface is treated with glue (coupling agent) to increase the bonding force between the seal and the metal part.

[0023] The valve stem structure adopts the integral vulcanization (using rubber material to prepare an integrated sealing layer, or using injection molding or thermoforming elastic polymer materials) technology ( Figure 2 , Figure 3 ), which reduces the number of parts and the cost of the product. At the same time, because the number of parts is reduced, the failure rate of the entire valve body is also reduced. Since the integral vulcanization technology is adopted, the risk of missing the sealing layer on the valve stem is eliminated.

[0024] After the valve stem and the moving iron core are connected by threads, an O-ring seal is added. At the same time, sealant is applied to the threads for secondary sealing and fixation. When the valve body is ventilated but not powered (power-off), the gas medium passes through the central holes of the valve stem 3 and the static iron core 2 and enters the gap between the upper sleeve 5 and the static iron core 2 until the sealing part between the T-ring assembly 10 and the valve stem 3. In this structure, the downward pressure generated by the upper gas medium is balanced with the upward pressure generated by the valve port and the sealing surface. This design can reduce the force value of the spring, and finally it is reflected that the coil output power on the valve body can be reduced, realizing the function of lower power output, and further confirming the safety of the solenoid valve during use.

[0025] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements or improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A direct-acting low-power solenoid valve, characterized in that: It includes a valve body, a moving iron core, a valve stem and is connected with a moving valve core, a static iron core, a sleeve, a valve cover, a mounting buckle, a support frame, a spring, and a T-ring assembly; an air inlet and an exhaust port may be provided on one side of the valve body, and a working port is provided on the opposite side of the valve body; a lower sealing layer is installed at the lower end of the valve stem to match the shape of the lower valve port, and an upper sealing layer is installed at the upper end of the valve stem to match the shape of the upper valve port; the upper and lower sealing layers are driven by the moving iron core in the valve body to move up and down to realize the switching of the flow direction of the passage between the air inlet, the working port and the exhaust port; the upper sealing layer installed at the upper end of the valve stem and the lower sealing layer installed at the lower end are integrated; the static iron core is at the upper part of the sleeve, the moving iron core is at the lower part of the static iron core, the electromagnetic coil driving the moving iron core is assembled at the outer periphery of the lower end of the static iron core, a return spring is provided in the sleeve, the elastic force of the return spring causes the moving iron core to separate from the static iron core downward, and two guide rings are fixed at the upper and lower positions of the sleeve to limit the sliding of the valve stem and the moving iron core.

2. The direct-acting low-power solenoid valve according to claim 1 is characterized in that: The valve stem and the static iron core are provided with a center hole and are coaxial.

3. The direct-acting low-power solenoid valve according to claim 1 is characterized in that: The lower sealing layer at the lower end of the valve stem and the upper sealing layer installed at the upper end of the valve stem adopt a vulcanized structure.

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