Direct-acting type two-position three-way electromagnetic valve

Abstract

The utility model belongs to the technical field of electromagnetic valves, and particularly relates to a direct-acting type two-position three-way electromagnetic valve which is characterized in that an inlet and an outlet are formed in a valve body, a magnetism isolating pipe is installed on the valve body, a coil is sleeved on the periphery of the magnetism isolating pipe, a static iron core is arranged in the magnetism isolating pipe, and the static iron core divides the interior of the magnetism isolating pipe into an upper valve cavity and a lower valve cavity; an upper movable iron core is arranged in the upper valve cavity, a lower movable iron core is arranged in the lower valve cavity, an ejector rod is arranged in the static iron core, the two ends of the ejector rod are connected with the upper movable iron core and the lower movable iron core respectively, a spring piece is arranged in the lower valve cavity, one end of the spring piece is fixedly connected with the bottom of the lower movable iron core, and the other end of the spring piece is fixedly connected with the top of the valve body. The upper movable iron core and the lower movable iron core which are arranged up and down are connected into a whole through the ejector rod in the static iron core and can move in the inner cavity of the magnetism isolating pipe, the on-off state of a fluid channel is changed, and accurate control over the fluid channel of the electromagnetic valve is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of electromagnetic valve technology, specifically relating to a direct-acting two-position three-way electromagnetic valve. Background Technology

[0002] Solenoid valves are a key component for achieving direct-acting control of pipelines. By controlling the on / off state of the control coil voltage, they can control the flow direction or flow of fluid in the pipeline. A 2-position 3-way solenoid valve uses a single solenoid coil to control the flow direction at three ports. They are generally classified as reversing type, normally closed type, normally open type, and general-purpose type. They are characterized by compact structure, fast response time, low cost, and reliable operation, and are widely used in the compressor industry, metallurgical and chemical industries, chemical analysis instruments, pharmaceutical and food manufacturing industries, etc., making them a widely used type of solenoid valve. In practical applications, one 2-position 3-way solenoid valve can replace two 2-position 2-way solenoid valves. However, many existing 2-position 3-way solenoid valves have shortcomings such as low operating pressure, small flow diameter, complex structure, and low reliability. Therefore, in practical applications, considering pipeline reliability and practicality, two 2-way solenoid valves are often chosen instead. This significantly increases the cost of using solenoid valves, resulting in a larger installation size and higher maintenance costs. Utility Model Content

[0003] I. Technical problems to be solved

[0004] This invention addresses the aforementioned deficiencies in existing technologies by proposing a direct-acting two-position three-way solenoid valve. A push rod inside the stationary iron core connects the upper and lower moving iron cores into a single unit, allowing it to move within the magnetically shielded tube and change the on / off state of the fluid channel. This achieves precise control of the fluid channel of the solenoid valve, thus solving the problems mentioned in the background.

[0005] II. Technical Solution

[0006] To solve the above-mentioned technical problems, this utility model provides a direct-acting two-position three-way solenoid valve, including a valve body with an inlet and an outlet. A magnetic shielding tube is installed on the valve body, and a coil is sleeved around the outer periphery of the magnetic shielding tube. A stationary iron core is installed inside the magnetic shielding tube, which divides the inside of the magnetic shielding tube into an upper valve chamber and a lower valve chamber. An upper moving iron core is installed inside the upper valve chamber, and a lower moving iron core is installed inside the lower valve chamber. A push rod is installed inside the stationary iron core, and the two ends of the push rod are connected to the upper moving iron core and the lower moving iron core, respectively. A spring is installed inside the lower valve chamber, with one end of the spring fixedly connected to the bottom of the lower moving iron core and the other end of the spring fixedly connected to the top of the valve body.

[0007] Preferably, the upper valve chamber is provided with an upper valve port at the top, which is connected to a discharge port, and the lower valve chamber is provided with an air inlet valve port and a lower valve port at the bottom, with the air inlet valve port connected to the inlet and the lower valve port connected to the outlet.

[0008] Preferably, an upper connecting block is provided inside the top of the magnetic shielding tube, and the discharge port is located on the top of the upper connecting block.

[0009] Preferably, a lower seal is provided at the bottom of the lower moving iron core.

[0010] Preferably, an upper sealing element is provided at one end of the inner center of the upper moving iron core, and a lower top block is provided at the other end of the inner center of the upper moving iron core, with an inner spring provided between the upper sealing element and the lower top block.

[0011] Preferably, the stationary iron core has a through hole at its center, and the push rod passes through the through hole to fix and connect the upper moving iron core and the lower moving iron core respectively.

[0012] Preferably, the magnetic shielding tube and the upper connecting block are fixedly connected by laser welding, and both the magnetic shielding tube and the upper connecting block are made of stainless steel.

[0013] Preferably, an O-ring is provided at the connection between the valve body and the magnetic shielding tube.

[0014] Preferably, the cross-section of the push rod is approximately square, and a gap is provided between the push rod and the inner wall of the through hole for fluid to pass through.

[0015] III. Beneficial Effects

[0016] Compared with the prior art, this utility model connects the upper and lower moving iron cores, which are set up above and below, into a whole by using a push rod inside the stationary iron core. It can move inside the inner cavity of the magnetic shielding tube to change the on / off state of the fluid channel, thereby realizing precise control of the fluid channel of the solenoid valve. It is small in size, has high operating pressure, various working modes, reliable operation, and low cost. Attached Figure Description

[0017] Figure 1 A cross-sectional view of a direct-acting two-position three-way solenoid valve. Figure 1 .

[0018] Figure 2 A cross-sectional view of a direct-acting two-position three-way solenoid valve. Figure 2 .

[0019] Figure 3 This is a cross-sectional view of the magnetic shielding tube of a direct-acting two-position three-way solenoid valve.

[0020] Figure 4 This is a cross-sectional view of the upper moving iron core of a direct-acting two-position three-way solenoid valve.

[0021] Figure 5 This is a cross-sectional view of the push rod and through hole of a direct-acting two-position three-way solenoid valve.

[0022] In the picture:

[0023] 1 is the valve body; 11 is the inlet; 12 is the outlet; 2 is the magnetic shielding tube; 21 is the upper valve chamber; 211 is the upper valve port; 22 is the lower valve chamber; 221 is the air inlet valve port; 222 is the lower valve port; 23 is the discharge port; 24 is the upper connecting block; 3 is the coil; 4 is the stationary iron core; 41 is the through hole; 5 is the upper moving iron core; 51 is the upper sealing element; 52 is the lower top block; 53 is the inner spring; 6 is the lower moving iron core; 61 is the lower sealing element; 7 is the push rod; 8 is the spring element; 9 is the O-ring. Detailed Implementation

[0024] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but should not be used to limit the scope of this utility model.

[0025] Example 1:

[0026] Combination Figure 1 , Figure 2 As shown, the direct-acting two-position three-way solenoid valve of this embodiment includes a valve body 1, which serves as the main structure. The valve body 1 is equipped with an inlet 11 and an outlet 12, which are used for the input and output of fluids (such as gas or liquid), realizing the basic control function of the solenoid valve. A magnetic shielding tube 2 is installed on the valve body 1. The magnetic shielding tube 2 plays a crucial role in isolating the magnetic field and guiding the magnetic circuit, ensuring the closure and efficient utilization of the magnetic circuit during the operation of the solenoid valve. A coil 3 is sleeved around the outer periphery of the magnetic shielding tube 2. The coil 3 is the driving core of the solenoid valve. When the coil 3 is energized, it generates a strong magnetic field, which acts on the magnetic elements inside the magnetic shielding tube 2, thereby driving the opening and closing action of the solenoid valve.

[0027] The magnetic shielding tube 2 contains a stationary iron core 4, which divides the interior of the magnetic shielding tube 2 into an upper valve chamber 21 and a lower valve chamber 22. The stationary iron core 4 effectively separates the upper valve chamber 21 and the lower valve chamber 22 into two independent spaces. The upper valve chamber 21 contains an upper moving iron core 5, and the lower valve chamber 22 contains a lower moving iron core 6. The upper moving iron core 5 and the lower moving iron core 6 can move up and down under the influence of the magnetic field, thereby opening and closing the valve.

[0028] The stationary iron core 4 is equipped with a push rod 7. The two ends of the push rod 7 are connected to the upper moving iron core 5 and the lower moving iron core 6 respectively. When the coil 3 is energized and generates a magnetic field, the stationary iron core 4 attracts the upper moving iron core 5 or the lower moving iron core 6 (depending on the direction of the current). Through the transmission effect of the push rod 7, the other upper moving iron core 5 or the lower moving iron core 6 moves accordingly, thereby changing the on / off state of the fluid channel.

[0029] A spring element 8 is installed inside the lower valve chamber 22. One end of the spring element 8 is fixedly connected to the bottom of the lower moving iron core 6, and the other end of the spring element 8 is fixedly connected to the top of the valve body 1. The main function of the spring element 8 is to provide a restoring force, ensuring that the lower moving iron core 6 can quickly and stably return to the initial position after the coil 3 is de-energized, thus preparing for the next action.

[0030] Combination Figure 1 and Figure 2 As shown, an upper valve port 211 is provided at the top of the upper valve chamber 21, and the upper valve port 211 is connected to a discharge port 23. The discharge port 23 plays a crucial role in certain operating states of the solenoid valve, such as when venting or depressurizing. By precisely controlling the opening and closing of the upper valve port 211, the solenoid valve can achieve precise regulation of fluid flow direction and pressure, thereby meeting the needs of various complex working conditions.

[0031] The bottom of the lower valve chamber 22 is provided with an inlet valve port 221 and a lower valve port 222. The inlet valve port 221 is connected to the inlet 11, and the lower valve port 222 is connected to the outlet 12. The inlet valve port 221 is directly connected to the inlet 11 of the solenoid valve, ensuring that external fluid can smoothly enter the solenoid valve. The lower valve port 222 is connected to the outlet 12 of the solenoid valve, responsible for outputting the fluid regulated by the solenoid valve to the external system. This not only simplifies the structure of the fluid channel and improves the efficiency and stability of fluid flow, but also makes the solenoid valve more flexible and accurate in controlling the fluid flow direction and pressure. By precisely controlling the opening and closing of the inlet valve port 221 and the lower valve port 222, the solenoid valve can achieve precise switching and regulation of the fluid flow direction, thereby meeting the fluid control requirements under various complex working conditions.

[0032] like Figure 2 As shown, an upper connecting block 24 is provided inside the top of the magnetic shielding tube 2, and a discharge port 23 is located on top of the upper connecting block 24. The upper connecting block 24 not only serves as a connection and support but also provides a stable and efficient installation position for the discharge port 23. The discharge port 23 located on top of the upper connecting block 24 ensures that fluid can flow smoothly out of the solenoid valve. A lower sealing element 61 is provided at the bottom of the lower moving iron core 6. The lower sealing element 61 is typically made of high-quality elastic materials, such as rubber, silicone, or special plastics. These materials have good elasticity and wear resistance, and can maintain a stable sealing effect during long-term operation.

[0033] During the operation of the solenoid valve, when the moving iron core 6 moves downward under the action of the magnetic field, the lower seal 61 moves accordingly and fits tightly against the sealing surface inside the valve body 1, thus sealing the fluid and closing the passage. Conversely, when the magnetic field disappears or changes direction, the moving iron core 6 moves downward under the action of the spring 8. At this time, the lower seal 61 moves accordingly and separates from the sealing surface inside the valve body 1, thereby opening the fluid passage.

[0034] An upper sealing element 51 is provided at one end of the inner center of the upper moving iron core 5. The upper sealing element 51 is usually made of high-quality elastic material, such as rubber, silicone, or special plastic. These materials have good elasticity and wear resistance, and can maintain a stable sealing effect during long-term operation. A lower top block 52 is provided at the other end of the inner center of the upper moving iron core 5. The lower top block 52 plays a supporting and force-transmitting role. The lower top block 52 can convert the movement of the upper moving iron core 5 under the action of the magnetic field into the opening or closing action of the fluid channel.

[0035] An inner spring 53 is provided between the upper seal 51 and the lower top block 52. The inner spring 53 serves as a buffer and reset mechanism. When the upper moving iron core 5 moves under the influence of a magnetic field, the inner spring 53 provides elastic support and buffering, thus protecting the upper seal 51 and the lower top block 52 from impact and wear. Simultaneously, when the magnetic field disappears or changes direction, the inner spring 53 can push the upper moving iron core 5 back to its initial position, achieving fluid sealing and channel closure. Furthermore, the introduction of the inner spring 53 makes the movement of the upper moving iron core 5 smoother and more controllable, preventing seal failure and component damage caused by impact and vibration.

[0036] Combination Figure 5 As shown, a through hole 41 is provided in the center of the stationary iron core 4, and the push rod 7 passes through the through hole 41 and is fixedly connected to the upper moving iron core 5 and the lower moving iron core 6 respectively. One end of the push rod 7 is connected to the upper moving iron core 5 by a fixed connection method, possibly through threaded locking, interference fit, etc., to ensure that the two can maintain stable synchronous movement under the action of electromagnetic force. Similarly, the other end of the push rod 7 is also fixedly connected to the lower moving iron core 6 by the same or similar fixed connection method, so that the stationary iron core 4, the upper moving iron core 5, and the lower moving iron core 6 can achieve rapid and accurate relative movement through the push rod 7. Furthermore, the cross-section of the push rod 7 is approximately square, while the cross-section of the through hole 41 is circular, so there is a certain area difference in the cross-section. Through this cross-section difference, the fluid in the lower valve chamber can smoothly enter the upper valve chamber. Similarly, through the push rod 7, the upper valve port 211 and the lower valve port 222 are linked together. When the upper valve port is closed, the lower valve port is open; when the upper valve port is open, the lower valve port is closed. When the upper valve is closed, inlet 11 and outlet 12 are connected, and outlet 23 is closed; when the lower valve is closed, inlet and outlet are connected, and outlet is closed.

[0037] Therefore, based on the above structure and actual operating conditions, inlet 11, outlet 12, and discharge port 23 can all be used as pressure ports, with the pressure port serving as the actual inlet. When the inlet is used as a pressure port, when coil 3 is de-energized, the medium flows from the inlet to the outlet; when coil 3 is energized, the medium flows from the inlet to the discharge port. In this case, the solenoid valve operates as a reversing type. When the outlet is used as a pressure port, when coil 3 is de-energized, the medium flows from the outlet to the inlet, and the discharge port is closed. When coil 3 is energized, the outlet is closed, and the inlet and discharge port are interconnected. In this case, the solenoid valve operates as a normally open type. When the discharge port is used as a pressure port, when coil 3 is de-energized, the discharge port is closed, and the inlet and outlet are interconnected. When coil 3 is energized, the outlet is closed, and the medium flows from the discharge port to the inlet. In this case, the solenoid valve operates as a normally closed type.

[0038] Combination Figure 1 and Figure 2 As shown, to ensure a secure and airtight connection between the valve body 1 and the magnetic shielding tube 2, an O-ring 9 is provided at the connection point. The O-ring 9 is a widely used sealing element, renowned for its excellent elasticity and sealing performance. The O-ring 9 is made of high-quality elastic materials such as rubber, silicone, or Teflon, which possess excellent corrosion resistance, high-temperature resistance, and wear resistance. The O-ring 9 is annular in shape, allowing it to fit tightly against the connection surface between the valve body 1 and the magnetic shielding tube 2, forming an effective sealing barrier to prevent fluid leakage.

[0039] Example 2:

[0040] Compared to Example 1, both the magnetic shielding tube 2 and the upper connecting block 24 are made of stainless steel. Stainless steel is a widely used austenitic stainless steel with good corrosion resistance, high temperature resistance, and mechanical strength. This material choice not only ensures the stability and durability of the magnetic shielding tube 2 and the upper connecting block 24 during long-term operation, but also enables the solenoid valve to adapt to various harsh working environments, such as high temperature, high pressure, and corrosive fluids. To ensure the stability and sealing of the connection, the magnetic shielding tube 2 and the upper connecting block 24 are fixedly connected by laser welding. Laser welding is a high-precision and high-efficiency welding method. Utilizing the high energy density of the laser beam, the contact surface of the magnetic shielding tube 2 and the upper connecting block 24 is instantly heated to a molten state, thereby achieving a seamless connection. This not only improves the connection strength between components but also ensures the sealing of the connection, avoiding the risk of fluid leakage.

[0041] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A direct-acting two-position three-way solenoid valve, characterized in that, The direct-acting two-position three-way solenoid valve includes a valve body (1), an inlet (11) and an outlet (12) on the valve body (1), a magnetic shielding tube (2) installed on the valve body (1), a coil (3) wrapped around the outer periphery of the magnetic shielding tube (2), a stationary iron core (4) inside the magnetic shielding tube (2), the stationary iron core (4) divides the inside of the magnetic shielding tube (2) into an upper valve chamber (21) and a lower valve chamber (22), an upper moving iron core (5) inside the upper valve chamber (21), a lower moving iron core (6) inside the lower valve chamber (22), a push rod (7) inside the stationary iron core (4), the two ends of the push rod (7) being connected to the upper moving iron core (5) and the lower moving iron core (6) respectively, a spring element (8) inside the lower valve chamber (22), one end of the spring element (8) being fixedly connected to the bottom of the lower moving iron core (6), and the other end of the spring element (8) being fixedly connected to the top of the valve body (1).

2. The direct-acting two-position three-way solenoid valve according to claim 1, characterized in that, The upper valve chamber (21) is provided with an upper valve port (211) at the top, and the upper valve port (211) is connected to the discharge port (23). The lower valve chamber (22) is provided with an air inlet valve port (221) and a lower valve port (222) at the bottom. The air inlet valve port (221) is connected to the inlet (11), and the lower valve port (222) is connected to the outlet (12).

3. A direct-acting two-position three-way solenoid valve according to claim 2, characterized in that, The top of the magnetic shielding tube (2) is provided with an upper connecting block (24), and the discharge port (23) is located on the top of the upper connecting block (24).

4. A direct-acting two-position three-way solenoid valve according to claim 1, characterized in that, The bottom of the lower moving iron core (6) is provided with a lower seal (61).

5. A direct-acting two-position three-way solenoid valve according to claim 1, characterized in that, An upper sealing element (51) is provided at one end of the inner center of the upper moving iron core (5), and a lower top block (52) is provided at the other end of the inner center of the upper moving iron core (5). An inner spring (53) is provided between the upper sealing element (51) and the lower top block (52).

6. A direct-acting two-position three-way solenoid valve according to any one of claims 1-5, characterized in that, The stationary iron core (4) has a through hole (41) in its center. The top rod (7) passes through the through hole (41) and is fixedly connected to the upper moving iron core (5) and the lower moving iron core (6).

7. A direct-acting two-position three-way solenoid valve according to claim 6, characterized in that, The magnetic shielding tube (2) and the upper connecting block (24) are fixedly connected by laser welding. Both the magnetic shielding tube (2) and the upper connecting block (24) are made of stainless steel.

8. A direct-acting two-position three-way solenoid valve according to claim 7, characterized in that, An O-ring (9) is provided at the connection between the valve body (1) and the magnetic shielding tube (2).

9. A direct-acting two-position three-way solenoid valve according to claim 6, characterized in that, The top rod (7) has an approximately square cross section, and a gap for fluid passage is provided between the top rod (7) and the inner wall of the through hole (41).

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