An electromagnetic valve

Abstract

The utility model belongs to pneumatic control valve technical field especially, it is a kind of solenoid valve, including valve body and valve core, solenoid valve includes valve cavity;Valve core is located in valve cavity, and valve core includes valve core body and piston head;Solenoid valve includes first cavity and second cavity, along the moving direction of piston head, first cavity and second cavity are isolated arrangement, and first cavity and second cavity are located the two sides of piston head;Second cavity corresponding wall part includes the end wall of piston head, and first cavity includes ventilation gap, ventilation gap is located between valve core body and first cavity corresponding wall part, and valve body has exhaust hole, and ventilation gap is communicated with exhaust hole.The utility model solves the problem that the breathing hole of solenoid valve is directly connected with atmosphere and causes impurity to enter piston cavity, and piston head movement is not easily influenced by external pollutants, is favorable for improving the dustproof performance of solenoid valve whole.

Description

Technical Field

[0001] This utility model belongs to the field of pneumatic control valve technology, and in particular relates to a solenoid valve. Background Technology

[0002] A solenoid valve is a fundamental industrial automation component that uses electromagnetic force to control the flow of fluid. Belonging to the category of controllers, it is widely used in pneumatic control systems. A traditional solenoid valve typically consists of a valve body, valve core, pilot valve, and piston. Its working principle is as follows: an electromagnetic drive mechanism controls the opening and closing of the pilot valve, allowing gas to enter the piston chamber, which in turn pushes the piston to move. The piston then drives the valve core to switch the flow path. During the operation of the solenoid valve, the valve body usually has an exhaust port. Related technologies typically connect a silencer or install a filter screen at the exhaust port. These devices can, to some extent, block external particles, thus playing a filtering role.

[0003] Currently, to ensure the piston can move freely back and forth within the piston chamber, a breather hole is required, allowing direct communication between the piston chamber and the atmosphere. When the pilot valve opens, gas enters the piston chamber through the pilot valve and acts on one side of the piston, pushing it to move. Gas on the other side of the piston is discharged through the breather hole. When the pilot valve closes, the gas pressure decreases, the piston moves in the opposite direction, and external gas re-enters the piston chamber through the breather hole, thus replenishing the gas supply. However, the breather hole is located between the pilot valve and the valve body, and it is directly connected to the atmosphere. Under certain harsh operating conditions, this can lead to blockage of the breather hole or impurities entering the piston chamber. For example, when external dust enters the piston chamber, it can cause premature wear, jamming, or even failure of the piston seal ring, affecting the operation of the solenoid valve. Utility Model Content

[0004] In view of this, the present invention aims to propose a solenoid valve to solve the problem that the breather hole of the existing solenoid valve is directly connected to the atmosphere, which causes impurities to enter the piston chamber.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows: An electromagnetic valve includes a valve body and a valve core, and the electromagnetic valve includes a valve cavity; the valve core is located in the valve cavity, and the valve core includes a valve core body and a piston head; the electromagnetic valve includes a first cavity and a second cavity, which are isolated along the moving direction of the piston head, and the first cavity and the second cavity are located on both sides of the piston head; the wall corresponding to the second cavity includes the end wall of the piston head, the first cavity includes a vent gap, the vent gap is located between the valve core body and the wall corresponding to the first cavity, the valve body has an exhaust hole, and the vent gap communicates with the exhaust hole.

[0006] Compared with the prior art, the solenoid valve of this utility model has the following advantages: This invention discloses an electromagnetic valve comprising a first chamber and a second chamber. The first chamber includes a vent gap that communicates with an exhaust port, allowing gas to enter the second chamber and act on one side of a piston head. Gas on the other side of the piston head exits the valve chamber through the vent gap and the exhaust port, preventing external gas from directly entering the valve chamber during piston head movement and ensuring that the piston head is not affected by contaminants during operation. This invention solves the problem of impurities entering the piston chamber due to the vent hole being directly connected to the atmosphere, and also improves the overall dustproof performance of the electromagnetic valve by making the piston head movement less susceptible to external contaminants. Attached Figure Description

[0007] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 A schematic diagram of one embodiment of a solenoid valve; Figure 2 for Figure 1 A cross-sectional schematic diagram of one embodiment of a solenoid valve; Figure 3 for Figure 2 A schematic diagram of the solenoid valve when the valve core is in the first stroke position; Figure 4 for Figure 2 A schematic diagram of the valve core in a solenoid valve; Figure 5 for Figure 4 A schematic diagram of the piston head in a solenoid valve; Figure 6 for Figure 2 A schematic diagram of the structure of the first chamber in a solenoid valve; Figure 7 This is a cross-sectional schematic diagram of another embodiment of the solenoid valve; Figure 8 for Figure 7 A magnified view of a portion of point A in the middle; Figure 9 for Figure 7 A schematic diagram of the structure of a solenoid valve with a wear-resistant component having an air passage. Figure 10 for Figure 7 A magnified view of a portion of point B in the middle; Figure 11 for Figure 7 Schematic diagram of the piston head in a solenoid valve; Figure 12 for Figure 7 A schematic diagram of the solenoid valve when the valve core is in the first stroke position; Figure 13 for Figure 7 A schematic diagram of the solenoid valve when the valve core is in the second stroke position.

[0008] Explanation of reference numerals in the attached figures: 100, Valve body; 110, Exhaust port; 120, Breathing airway; 130, Air inlet; 140, Rear cover; 150, Spring; 160, Limiting part; 170, First wall part; 180, First end; 200, Pilot valve; 210, Pilot passage; 220, Pilot seat; 300. Valve core; 310. Piston head; 311. Mating part; 312. Seal; 313. Receiving groove; 314. Chamfer; 315. Guide cone surface; 320. Valve core body; 321. Assembly groove; 330. Vent clearance; 331. Mating clearance; 400, Valve chamber; 410, First chamber; 420, Second chamber; 500. Sealing components; 600, Wear-resistant parts; 610, Air passage. Detailed Implementation

[0009] The technical solution of the specific implementation method is described below with reference to the accompanying drawings.

[0010] It should be noted that although this specification has described the present utility model with reference to the above embodiments, those skilled in the art should understand that they can still modify, combine or make equivalent substitutions to the present utility model. All technical solutions and improvements that do not depart from the spirit and scope of the present utility model should be covered within the scope of the claims of the present utility model.

[0011] Please refer to Figure 1 and Figure 2 This utility model provides a solenoid valve, which includes a valve body 100 and a valve core 300. The solenoid valve includes a valve cavity 400. The valve core 300 is located in the valve cavity 400 and includes a valve core body 320 and a piston head 310. The solenoid valve includes a first cavity 410 and a second cavity 420. The first cavity 410 and the second cavity 420 are isolated along the moving direction of the piston head 310 and are located on both sides of the piston head 310. Specifically, when the piston head 310 moves, it can divide the valve cavity 400 into the first cavity 410 and the second cavity 420. The wall of the second cavity 420 includes the end wall of the piston head 310. The first cavity 410 includes a vent gap 330, which is located between the valve core body 320 and the wall of the first cavity 410. The valve body 100 has an exhaust hole 110, and the vent gap 330 communicates with the exhaust hole 110.

[0012] It is understandable that the solenoid valve includes a first chamber 410 and a second chamber 420. When the piston head 310 is in one stroke position, the volume of the second chamber 420 can be very small. For example, when the piston head 310 is in one stroke position, the volume of the second chamber 420 can be very small, as long as gas can enter and act on the end wall of the piston head 310. That is, the pilot valve 200 is in the open state, and gas enters the second chamber 420 and acts on the end wall of the piston head 310. During the movement of the piston head 310, the first chamber 410 and the second chamber 420 are dynamically changing. When the piston head 310 moves to another stroke position, the volume of the first chamber 410 and the second chamber 420 stops changing.

[0013] In this embodiment, the valve chamber 400 is the internal space of the solenoid valve that can be formed by the valve body 100 and the pilot valve 200, and the valve chamber 400 can meet the actuation requirements of the valve core 300. The piston head 310 can move within the valve chamber 400, meaning the valve chamber 400 includes a piston chamber for the piston head 310 to move. It should be understood that when the pilot valve 200 is in the closed state, the piston head 310 moves towards the pilot valve 200. When the piston head 310 moves, the second chamber 420 may have two situations: First, when the piston head 310 moves inside the valve body 100, the wall of the second chamber 420 includes the wall of the piston head 310, the wall of the valve body 100, and the wall of the pilot valve 200. At this time, the second chamber 420 is the space formed by the wall of the piston head 310, the wall of the valve body 100, and the wall of the pilot valve 200. Second, when the piston head 310 enters the pilot valve 200, the wall of the second chamber 420 includes the wall of the piston head 310 and the wall of the pilot valve 200. At this time, the second chamber 420 is the space formed by the wall of the piston head 310 and the wall of the pilot valve 200.

[0014] Along the moving direction of the valve core 300, the rear cover 140 of the valve body 100 and the pilot valve 200 are located on opposite sides of the valve body 100. The opening and closing of the pilot valve 200 can be controlled by switching the coil in the pilot valve 200 on and off. When the pilot valve 200 is in the open state, gas can enter the second chamber 420 through the pilot channel 210 and push the piston head 310 to move the valve core 300 towards the rear cover 140 of the valve body 100 to change the solenoid valve passage. At this time, the valve core 300 will squeeze the spring 150 and the gas at the rear cover 140 of the valve body 100. The spring 150 and the gas are compressed by the squeezing force. At this time, the spring 150 will generate a restoring force, and this will cause the gas pressure at the rear cover 140 of the valve body 100 to increase. Correspondingly, when the pilot valve 200 is in the closed state, the return force and air pressure of the spring 150 at the rear cover 140 of the valve body 100 will push the valve core 300 to move towards the pilot valve 200, so that the valve core 300 drives the piston head 310 to move towards the pilot valve 200, and the gas in the second chamber 420 can be discharged through the pilot valve 200 to achieve the reset of the piston head 310.

[0015] It should be understood that in some other implementations of this embodiment, the rear cover 140 of the valve body 100 can also be connected to an external air supply device to allow for the discharge and replenishment of gas at the rear cover 140 of the valve body 100. In this case, even without the aforementioned spring 150 and other structures, when the pilot valve 200 is in the open state, the gas at the rear cover 140 of the valve body 100 can be discharged into the external air supply device to meet the movement requirements of the piston head 310. Correspondingly, when the pilot valve 200 is closed, gas can be replenished to the rear cover 140 of the valve body 100 using the external air supply device. The replenished gas generates air pressure, which can also be used to push the valve core 300 to drive the piston head 310 to reset.

[0016] refer to Figure 2 and Figure 3 In this embodiment, the pilot valve 200 has a pilot channel 210. When the pilot valve 200 is in the open state, the pilot channel 210 and the second chamber 420 are connected. Correspondingly, when the pilot valve 200 is in the closed state, the pilot channel 210 and the second chamber 420 are disconnected. When the pilot valve 200 is in the open state, as the gas pushes the piston head 310 to move the valve core 300 toward the rear cover 140 of the valve body 100, the piston head 310 compresses the gas in the first chamber 410, and the gas in the first chamber 410 can be discharged through the vent gap 330 and the exhaust port 110. Correspondingly, when the pilot valve 200 is in the closed state, the return force of the spring 150 at the rear cover 140 of the valve body 100 and the air pressure will push the valve core 300 to move towards the pilot valve 200. During the process of the valve core 300 driving the piston head 310 to move towards the pilot valve 200, the gas in the exhaust port 110 can be replenished into the first chamber 410 through the ventilation gap 330 to achieve gas replenishment and meet the movement needs of the piston head 310.

[0017] Using the above configuration, during operation, the solenoid valve allows the exhaust port 110 to be connected via the vent gap 330, preventing the first chamber 410 from being directly connected to the outside. Ventilation is only required through the exhaust port 110, ensuring that the gas entering the first chamber 410 is filtered clean gas. External dust and foreign objects cannot enter the first chamber 410, thus ensuring that the movement of the piston head 310 is not affected by external contaminants. Furthermore, the sealing component 312 of the piston head 310 is less likely to fail due to external contaminants, improving the overall dustproof performance of the solenoid valve.

[0018] refer to Figure 7Another embodiment of this utility model also provides a solenoid valve, which can also solve the problem of impurities entering the piston chamber due to the direct connection between the breather hole of the solenoid valve and the atmosphere. Both involve forming a ventilation gap 330 between the valve core body 320 and the inner wall of the first chamber 410, and using the ventilation gap 330 to connect with the exhaust hole 110 to achieve ventilation, so as to meet the movement needs of the piston head 310. The resulting technical effects are similar, and the working process is also similar, so it will not be described in detail here.

[0019] For example, refer to Figure 2 and Figure 7 The valve body 100 can be the valve body 100 of a multi-position multi-way solenoid valve. The valve body 100 includes a valve cavity, a valve core body 320 located in the valve cavity, and the valve core body 320 cooperates with the inner wall of the valve cavity. The valve body 100 also includes an air inlet 130 communicating with the valve cavity, and an exhaust port 110 also communicating with the valve cavity. The valve core body 320 is movable within the valve cavity, meaning the valve cavity 400 includes a valve chamber for the valve core body 320 to move. It should be understood that the number of air inlets 130 and exhaust ports 110 varies on different types of solenoid valves, and the structure of the valve core body 320 also differs. This embodiment does not involve improvements to the structure of the valve body 100 or the valve core body 320. Those skilled in the art can adjust the structure of the valve body 100 and the valve core body 320 according to the operating requirements of the solenoid valve, as long as the usage requirements of the solenoid valve are met.

[0020] Optionally, the pilot valve 200 and the valve body 100 can be connected by bolts or other means, and a sealing component 500, such as a sealing ring, sealing packing, or sealant, can be provided between the pilot valve 200 and the valve body 100 to seal the connection and prevent leakage in the valve chamber 400. Correspondingly, a breather hole is provided between the pilot valve 200 and the valve body 100, allowing dust and other particles in the atmosphere to enter the valve chamber 400 through the breather hole. By providing a sealing component 500 between the pilot valve 200 and the valve body 100, a seal is achieved at the connection between the pilot valve 200 and the valve body 100. Compared to the prior art, this prevents dust and other particles from entering the solenoid valve through the gap between the pilot valve 200 and the valve body 100, thus improving the overall dustproof performance of the solenoid valve.

[0021] In practical applications, taking the use of a sealing ring as the sealing component 500 as an example, both the valve body 100 and the pilot valve 200 can have grooves for assembling the sealing ring, or the grooves can be set separately on the valve body 100 or the pilot valve 200, thereby positioning and assembling the sealing component 500 through the grooves. Those skilled in the art can also select other suitable sealing components 500 according to actual needs and adopt the corresponding conventional assembly method of the sealing component 500 to achieve a seal between the valve body 100 and the pilot valve 200.

[0022] It should be understood that in some other implementations of this utility model, the pilot valve 200 and the valve body 100 may also be connected by welding or bonding. In this case, even without the aforementioned sealing component 500, the pilot valve 200 and the valve body 100 can still have relatively good sealing performance.

[0023] Optionally, the existing assembly gap between the valve core body 320 and the valve body 100 can be used to form the venting gap 330. This simplifies the structure of the venting gap 330 and makes assembly easier. It not only simplifies the structure of the solenoid valve and reduces the processing difficulty and production cost of the solenoid valve, but also reduces the assembly difficulty of the solenoid valve and shortens the assembly time to improve the assembly and production efficiency of the solenoid valve.

[0024] In a preferred embodiment of this example, reference is made to... Figure 3 The solenoid valve includes a pilot valve 200 located on one side of the valve core 300 body along the moving direction of the piston head 310. The valve body 100 has a first wall portion 170 extending along the moving direction of the piston head 310. When the pilot valve 200 is in the open state and the valve core 300 is in the first stroke position, a portion of the first wall portion 170 is airtightly coupled to the piston head 310. The wall portion corresponding to the second chamber 420 includes a portion of the first wall portion 170. The first stroke position of the valve core 300 is one stroke position when the pilot valve 200 is in the open state, and correspondingly, the second stroke position of the valve core 300 is another stroke position when the pilot valve 200 is in the closed state.

[0025] For example, the valve chamber 400 is entirely located within the valve body 100, meaning that both the first chamber 410 and the second chamber 420 are located within the valve body 100 when the piston head 310 moves. This configuration allows for partial airtight coupling between the piston head 310 and the first wall portion 170 of the valve body 100 using the sealing element 312. This enables the piston head 310 to divide the valve chamber 400 into the first chamber 410 and the second chamber 420 during movement, and also guides the piston head 310, ensuring it remains within the valve body 100 throughout its movement. During machining and assembly, only the valve chamber 400 needs to be machined into the valve body 100, ensuring the fit accuracy between the inner wall of the valve chamber 400 and the outer wall of the piston head 310. This reduces the machining accuracy requirements of the pilot valve 200 wall, thus lowering the machining difficulty and production cost of the pilot valve 200. In addition, since the piston head 310 does not need to extend into the pilot valve 200, the assembly difficulty of the pilot valve 200 is reduced, which helps to shorten the assembly time of the pilot valve 200 and improve the overall assembly efficiency and production efficiency of the solenoid valve.

[0026] The solenoid valve produced using the above method, refer to Figure 3When the pilot valve 200 is in the open state and the valve core 300 is in the first stroke position, gas enters the second chamber 420 through the pilot channel 210 and pushes the piston head 310 to move the valve core 300 towards the rear cover 140 of the valve body 100. The wall of the second chamber 420 includes the wall of the piston head 310, part of the first wall 170 on the valve body 100, and the wall of the pilot valve 200. At this time, the second chamber 420 is the space formed by the wall of the piston head 310, part of the first wall 170 on the valve body 100, and the wall of the pilot valve 200. At the same time, as the gas pushes the piston head 310 to move the valve core 300 towards the rear cover 140 of the valve body 100, the piston head 310 compresses the gas in the first chamber 410, and the gas in the first chamber 410 can be discharged through the vent gap 330 and the exhaust port 110. Therefore, even if the solenoid valve in this embodiment does not use a breather hole, it can still achieve ventilation by connecting the vent gap 330 with the exhaust hole 110 to meet the movement requirements of the piston head 310.

[0027] In another preferred embodiment of this example, reference is made to... Figure 3 The pilot valve 200 includes a pilot seat 220. Along the moving direction of the piston head 310, the valve body 100 has a first end 180. The pilot seat 220 and the first end 180 are limited or fixed. When the pilot valve 200 is in the open state and the valve core 300 is in the first stroke position, the wall portion corresponding to the second chamber 420 includes a portion of the first wall portion 170 and the wall portion of the pilot seat 220. The first end 180 of the valve body 100 and the pilot valve 200 can be connected by bolts or other means.

[0028] For example, a portion of the valve chamber 400 is located in the valve body 100, and another portion is located in the pilot seat 220. For instance, when the piston head 310 moves, the first chamber 410 is located in the valve body 100, and the second chamber 420 is at least partially located in the pilot seat 220. With this configuration, the length of the pilot valve 200 can remain unchanged. By utilizing a portion of the internal space of the pilot seat 220 to accommodate the piston head 310, the length of the portion of the valve chamber 400 on the valve body 100 can be reduced without changing the stroke of the valve core 300 and the piston head 310 (i.e., the length of the valve chamber 400 remains unchanged). The valve body 100 can be designed to be shorter, which is beneficial for shortening the overall length of the solenoid valve, realizing the miniaturization of the solenoid valve, and facilitating its application in space-constrained environments.

[0029] When the pilot valve 200 is in the open state and the valve core 300 is in the first stroke position, gas enters the second chamber 420 through the pilot channel 210 and pushes the piston head 310 to move the valve core 300 towards the rear cover 140 of the valve body 100. During the movement of the piston head 310, the second chamber 420 may have two situations: First, when the piston head 310 moves within the internal space of the pilot seat 220, the corresponding wall of the second chamber 420 includes the wall of the piston head 310 and the wall of the pilot seat 220. The second cavity 420 is the space formed by the wall of the piston head 310 and the wall of the pilot seat 220 when the piston head 310 moves within the internal space of the valve body 100. Alternatively, when the piston head 310 moves within the internal space of the valve body 100, the wall of the second cavity 420 includes the wall of the piston head 310, a portion of the first wall 170 on the valve body 100, and the wall of the pilot seat 220.

[0030] During the process of the gas-driven piston head 310 moving the valve core 300 towards the rear cover 140 of the valve body 100, the piston head 310 compresses the gas in the first chamber 410, and the gas in the first chamber 410 can be discharged through the vent gap 330 and the exhaust port 110. Therefore, even if the solenoid valve in this embodiment does not use a breather port, it can still achieve ventilation by utilizing the vent gap 330 and the exhaust port 110 to meet the movement requirements of the piston head 310.

[0031] Correspondingly, when the length of the valve body 100 remains unchanged, similar to the above situation, by borrowing a portion of the internal space of the valve body 100 to accommodate the piston head 310, and by integrating the piston head 310 onto the valve core 300, the piston head 310 can enter the valve body 100 when it moves toward the rear cover 140 of the valve body 100. At this time, part of the second chamber 420 is located in the valve body 100, so the remaining part of the second chamber 420 located on the pilot seat 220 can be shorter, the pilot valve 200 can also be shorter, which is also beneficial to shorten the overall length of the solenoid valve.

[0032] refer to Figure 4 The valve core 300 is a one-piece molded structure. For example, the valve core 300 can be injection molded as a single unit, meaning that the valve core 300, valve core body 320, and piston head 310 are all injection molded as a single unit. Adopting a one-piece structure for the valve core 300 improves the structural strength of the piston head 310 and the overall valve core 300 structure. Furthermore, compared to other molding methods, the one-piece injection molded valve core 300 offers higher production and processing efficiency, reduces the difficulty of manufacturing and processing the valve core 300, and thus lowers production costs.

[0033] Optionally, the piston head 310 has a guide cone surface 315, the valve core body 320 is coaxially arranged with the piston head 310, and the diameter of the piston head 310 is larger than the diameter of the valve core body 320. The guide cone surface 315 is a transition surface formed by the extension of the outer peripheral wall edge of the piston head 310 to the outer peripheral wall of the valve core body 320.

[0034] Using the above configuration, during the assembly of the solenoid valve, the valve core body 320 needs to be assembled into the valve cavity 400 first, and then the piston head 310 is assembled into the valve cavity 400. During the assembly of the piston head 310, the guide cone surface 315 can cooperate with the inner wall of the valve cavity 400 to provide guidance, facilitating the alignment of the piston head 310 into the valve cavity 400. This reduces the assembly difficulty of the piston head 310 and improves the assembly efficiency of the valve core 300 and piston head 310. Furthermore, when the piston head 310 moves towards the rear cover 100 of the valve body 100, the guide cone surface 315 can also prevent the piston head 310 from scratching the inner wall of the valve cavity 400 during movement, thus improving the reliability of the piston head 310 during movement within the valve cavity 400.

[0035] Optional, refer to 4 to Figure 6 The piston head 310 has a chamfer 314 on the side edge facing the pilot valve 200. For example, the chamfer 314 can be a 45° chamfer, an oblique chamfer, or a rounded chamfer. By setting the chamfer 314 on the edge of the piston head 310, the chamfer 314 can prevent the edge of the piston head 310 from scratching the inner wall of the second chamber 420 during the movement of the piston head 310 towards the second chamber 420, and prevent the piston head 310 from getting stuck or jammed. This helps to improve the reliability of the piston head 310 when it moves in the valve chamber 400.

[0036] In another preferred embodiment of this example, reference is made to... Figure 7 , Figure 10 , Figure 12 and Figure 13 The pilot valve 200 includes a pilot seat 220. Along the moving direction of the piston head 310, the valve body 100 has a first end 180. The pilot seat 220 and the first end 180 are limited or fixedly disposed. The pilot seat 220 has a first wall portion 170 extending along the moving direction of the piston head 310. A portion of the first wall portion 170 is hermetically coupled to the piston head 310. Specifically, a seal 312 is provided between the first wall portion 170 and the piston head 310. When the pilot valve 200 is in the open state, and the valve core 300 is in the first stroke position, the wall portion corresponding to the second chamber 420 includes a portion of the first wall portion 170. The first end 180 of the valve body 100 and the pilot valve 200 can be connected by bolts or other means.

[0037] For example, a portion of the valve chamber 400 is located in the valve body 100, and another portion is located in the pilot seat 220. For instance, when the piston head 310 moves, the second chamber 420 is always located in the pilot seat 220. The valve body 100 has a limiting portion 160, which is located in the valve guide space and can serve as a limit for the piston head 310 to move toward the rear cover 140 of the valve body 100.

[0038] refer to Figure 12 When the pilot valve 200 is in the open state, the gas pushes the piston head 310 to move the valve core 300 toward the rear cover 140 of the valve body 100. During the movement of the piston head 310, the second chamber 420 gradually increases and the first chamber 410 decreases until the piston head 310 abuts against the limiting part 160 to achieve the limiting. At this time, the valve core 300 is located in the first stroke position, the first chamber 410 is entirely located in the valve body 100, and the second chamber 420 is entirely located in the pilot seat 220.

[0039] refer to Figure 13 When the pilot valve 200 is in the closed state, the return force and air pressure of the spring 150 at the rear cover 140 of the valve body 100 will push the valve core 300 to move towards the pilot valve 200. During the movement of the piston head 310, the second chamber 420 gradually decreases and the first chamber 410 increases until the piston head 310 abuts against the wall of the pilot seat 220 to achieve the limit. At this time, the valve core 300 is located in the second stroke position, and part of the first chamber 410 is located in the pilot seat 220 and the other part is located in the valve body 100.

[0040] It should be noted that when the piston head 310 moves, the wall portion corresponding to the second cavity 420 includes the end wall of the piston head 310, a portion of the first wall portion 170 of the pilot seat 220, and the wall portion of the pilot seat 220. The second cavity 420 is the space formed by the end wall of the piston head 310, a portion of the first wall portion 170 of the pilot seat 220, and the wall portion of the pilot seat 220.

[0041] This configuration allows the piston head 310 to slide against the inner wall of the valve cavity 400, guiding the piston head 310 and ensuring that its side wall remains in contact with the wall of the pilot seat 220 during movement. During machining and assembly, only the fit accuracy between the inner wall of the valve cavity 400 at the pilot seat 220 and the outer wall of the piston head 310 needs to be ensured. This reduces the machining accuracy requirements for the inner wall of the valve cavity 400 at the valve body 100, thus lowering the machining difficulty and production cost of the valve body 100.

[0042] In a preferred embodiment of this example, reference is made to... Figure 7 and Figure 8The solenoid valve has a wear-resistant component 600, which is located between the valve core body 320 and the inner wall of the first chamber 410. The valve core body 320 has an assembly groove 321, and part of the wear-resistant component 600 is located in the assembly groove 321. The wear-resistant component 600 can be a wear ring, and its material can be wear-resistant materials such as polyurethane or polytetrafluoroethylene (PTFE). Polyurethane wear-resistant components 600 have good elasticity and wear resistance, low frictional resistance, and help extend their lifespan. PTFE wear-resistant components 600 have an extremely low coefficient of friction, excellent high-temperature resistance, oil resistance, corrosion resistance, and insulation properties, making them suitable for high-end sealing applications in food, medical, and chemical industries.

[0043] By providing an assembly groove 321 on the valve core body 320, the wear-resistant part 600 is limited by the assembly groove 321, which helps to improve the stability of the wear-resistant part 600 on the valve core body 320. In addition, the wear-resistant part 600 can also be a wear-resistant insert, etc. The core function of the wear-resistant part 600 is to maintain the movement clearance between the valve core body 320 and the valve body 100 under severe friction and high temperature and pressure, reduce the friction between the valve core body 320 and the valve body 100, and thus ensure the continuous and efficient operation of the solenoid valve.

[0044] Optional, see reference Figure 8 The ventilation gap 330 includes a mating gap 331, which is located between the wear-resistant part 600 and the inner wall of the first cavity 410, or between the wear-resistant part 600 and the valve core body 320.

[0045] By setting the fitting gap 331 between the wear-resistant part 600 and the inner wall of the first cavity 410, not only can the wear-resistant part 600 maintain the movement gap between the valve core body 320 and the inner wall of the first cavity 410, but it can also meet the ventilation requirements, ensuring that gas can flow to the exhaust port 110 through the ventilation gap 330 to achieve gas replenishment. Similarly, by setting the fitting gap 331 between the wear-resistant part 600 and the valve core body 320, the wear-resistant part 600 can better fit with the inner wall of the first cavity 410 to reduce friction, and gas can also flow to the exhaust port 110 through the ventilation gap 330 to achieve gas replenishment.

[0046] Optional, see reference Figure 9 The wear-resistant part 600 has a venting channel 610, which is connected to the venting gap 330. For example, the venting channel 610 can be a slot or opening on the wear-resistant part 600 to achieve the connection between the venting gap 330 on both sides of the wear-resistant part 600. By machining the venting channel 610 on the wear-resistant part 600, the venting channel 610 can also ensure the unobstructed flow of the venting gap 330, meeting the needs of gas flow and enabling gas replenishment.

[0047] Optional, see reference Figure 9 The air passage 610 and the mating clearance 331 can coexist. For example, the wear-resistant part 600 has an air passage 610 that is connected to the air passage 330. At the same time, the air passage 330 includes a mating clearance 331, which is located between the wear-resistant part 600 and the inner wall of the first cavity 410, or the mating clearance 331 is located between the wear-resistant part 600 and the valve core body 320.

[0048] When the pilot valve 200 is in the open state, gas pushes the piston head 310, causing the valve core 300 to move towards the rear cover 140 of the valve body 100. This allows the piston head 310 to compress the gas in the first chamber 410. Both the vent passage 610 and the mating clearance 331 are used for gas flow, enabling the gas to flow through the venting clearance 330 to the exhaust port 110. Similarly, when the pilot valve 200 is in the closed state, the piston head 310 moves towards the pilot valve 200 in the same manner. The vent passage 610 and the mating clearance 331 can serve as backups for each other, resulting in higher reliability. Even if one of them becomes blocked, gas can still flow along the venting clearance 330 to meet the movement requirements of the piston head 310.

[0049] Optionally, the wear-resistant part 600 can be a wear-resistant block. The wear-resistant parts 600 are arranged at intervals around the valve core body 320. The valve core body 320 is a cylindrical or other columnar structure, and the valve core body 320 is coaxially arranged with the piston head 310.

[0050] Wear-resistant components 600 can be arranged in two, three, or more at intervals along the circumference of the valve core body 320. The wear-resistant components 600 can be evenly or unevenly spaced. Those skilled in the art can adjust the number and arrangement of the wear-resistant components 600 according to actual needs, as long as it ensures that the wear-resistant components 600 can reduce friction and that the gaps between them meet the ventilation requirements. By arranging the wear-resistant components 600 at intervals, even if the mating clearance 331 and the air passage 610 become smaller or blocked during the movement of the piston head 310, the gaps between the wear-resistant components 600 can still ensure the unobstructed flow of the ventilation clearance 330.

[0051] It should be understood that in some other implementations of this embodiment, the wear-resistant part 600 may also be of other structures and may be installed on the valve core body 320 by means of bonding or screws. In this case, even if the aforementioned assembly groove 321 and other structures are not present, the wear-resistant part 600 may still be installed on the valve core body 320 by means of other installation methods, so that the wear-resistant part 600 can play the role of reducing the friction between the valve core body 320 and the inner wall of the first cavity 410.

[0052] Optional, see reference Figure 7The piston head 310 and the valve core body 320 are detachably connected, for example, by means of snap-fit, threaded connection, screw connection, etc. In practical applications, by using a detachable connection between the piston head 310 and the valve core body 320, not only can the stability of the connection between the piston head 310 and the valve core body 320 be ensured, allowing the piston head 310 and the valve core body 320 to move synchronously, but it also allows for the replacement of the damaged valve core body 320 or piston head 310 when the valve core body 320 or piston head 310 is damaged.

[0053] In a preferred embodiment of this example, reference is made to... Figure 6 and Figure 10 The piston head 310 includes a mating part 311 that mates with the inner wall of the valve cavity 400. A sealing element 312 is provided between the mating part 311 and the inner wall of the valve cavity 400. During the movement of the piston head 310, since the piston head 310 is always located inside the valve cavity 400, the mating part 311 is always present on the piston head 310 and slides against the inner wall of the valve cavity 400. By providing a sealing element 312 between the mating part 311 and the inner wall of the valve cavity 400, the sealing element 312 can play a sealing role during the movement of the piston head 310, thereby preventing gas exchange between the two sides of the piston head 310 and ensuring that the piston head 310 can move stably under the action of gas. This is beneficial to improving the opening and closing accuracy and reliability of the solenoid valve.

[0054] Optionally, the mating part 311 can be annular, and the sealing element 312 can be a sealing ring, which is coaxially arranged with the mating part 311. For example, it can be a bidirectional sealing ring such as an O-ring. By setting one sealing element 312, the sealing requirements during the movement of the piston head 310 can be met, simplifying the structure and improving the assembly efficiency of the sealing element 312. In addition, those skilled in the art can select a suitable sealing element 312 according to the actual sealing needs to achieve the sealing between the mating part 311 and the inner wall of the valve cavity 400, so as to meet the requirements of the piston head 310 moving under the action of gas. This will not be elaborated further here.

[0055] refer to Figure 5 , Figure 10 and Figure 11Furthermore, the mating part 311 has a receiving groove 313, and the sealing element 312 is partially located in the receiving groove 313. By providing the receiving groove 313 on the mating part 311 of the piston head 310, the sealing element 312 can be assembled on the piston head 310, allowing the sealing element 312 to move with the piston head 310, thus meeting the sealing requirements of the long-stroke piston head 310. At this time, the outer wall of the sealing element 312 cooperates with the inner wall of the valve cavity 400 to perform a sealing function, ensuring that the sealing element 312 can continuously perform a sealing function during the movement of the piston head 310.

[0056] In a preferred embodiment of this example, reference is made to... Figure 2 and Figure 7 The valve body 100 has a breathing air passage 120, with a ventilation gap 330 communicating with the breathing air passage 120 and the exhaust port 110. For example, the breathing air passage 120 is an internal opening of the valve body 100, which is not directly connected to the outside of the valve body 100. One end of the opening is connected to the ventilation gap 330, and the other end is connected to the exhaust port 110. During the movement of the piston head 310 toward the rear cover 140 of the valve body 100, the gas in the first chamber 410 is compressed. The gas can flow through the ventilation gap 330 and the breathing air passage 120 to the exhaust port 110 for discharge. During the repositioning process of the piston head 310 toward the pilot valve 200, the gas in the exhaust port 110 can be replenished into the first chamber 410 through the breathing air passage 120 and the ventilation gap 330 to meet the movement requirements of the piston head 310.

[0057] Correspondingly, the exhaust port 110 connected to the ventilation gap 330 can be the exhaust port 110 closest to the pilot valve 200, and the aforementioned exhaust port 110 is connected to the ventilation gap 330 by the breathing air passage 120. In this case, the flow length of gas discharge and replenishment in the first chamber 410 is shorter, which further simplifies the air passage structure and helps to improve the stability of the solenoid valve operation. At the same time, the aforementioned arrangement of the exhaust port 110 has less impact on the structure of the valve body 100 and is easier to implement and manufacture.

[0058] Optionally, the vent 110 connected to the ventilation gap 330 can also be a vent 110 at any position on the valve body 100. Taking the vent 110 furthest from the pilot valve 200, i.e. the vent 110 on the side of the rear cover 140 of the valve body 100, as an example, the gas flow requirements can also be met by setting a breathing air passage 120 on the valve body 100, connecting one end of the breathing air passage 120 to the aforementioned vent 110, and connecting the other end to the ventilation gap 330.

[0059] It should be understood that in some other implementations of this utility model, by providing a breathing air passage 120 on the valve body 100, the breathing air passage 120 can connect any one of the exhaust holes 110 on the valve body 100 with the ventilation gap 330, or it can connect multiple exhaust holes 110 with the ventilation gap 330. These methods can achieve the connection between the ventilation gap 330 and the exhaust holes 110, thereby satisfying the movement requirements of the piston head 310. Furthermore, those skilled in the art can also design and arrange the breathing air passage 120 according to actual needs, which will not be elaborated here.

[0060] In a preferred embodiment of this invention, the solenoid valve includes a silencer and a filter screen, both located in the exhaust port 110. The silencer has a dense porous structure and filters dust from the environment. Exemplarily, the silencer and valve body 100 are connected by threads, as are the filter screen and valve body 100. The inner wall of the exhaust port 110 has internal threads, and the outer walls of the filter screen and silencer have external threads that mate with the internal threads. During assembly, the filter screen can be installed into the exhaust port 110 first, followed by the silencer, or vice versa. This allows for the assembly of the filter screen and silencer onto the valve body 100.

[0061] When the pilot valve 200 is in the closed state, as the piston head 310 moves towards the pilot valve 200, the gas outside the exhaust port 110 can be replenished into the first chamber 410 through the ventilation gap 330 to meet the movement requirements of the piston head 310. Before the gas outside the exhaust port 110 enters the ventilation gap 330, the silencer and filter screen can effectively filter the gas entering the exhaust port 110, effectively preventing the valve core 300 and piston head 310 from getting stuck due to workshop dust and coolant droplets flowing back into the valve chamber 400 through the exhaust port 110.

[0062] Optionally, the filter screen can be a multi-layer metal filter screen, such as one made of stainless steel or aluminum alloy, which has better high-temperature resistance and corrosion resistance, and a wider range of applicable gases. Alternatively, the filter screen can be a conical or cylindrical filter screen, which has a large filtration area and is less prone to clogging, making it more suitable for high-pressure gas exhaust ports 110.

[0063] When the pilot valve 200 is closed, as the piston head 310 moves towards the pilot valve 200, external gas can enter the ventilation gap 330 and the first chamber 410 through the exhaust port 110 to replenish the gas supply and meet the movement requirements of the piston head 310. At this time, when external gas enters the exhaust port 110, the dense porous structure and filter screen on the muffler provide two-stage filtration, resulting in better filtration. Furthermore, the porous structure of the filter screen can work in conjunction with the porous structure of the muffler, extending the length or increasing the number of porous structures to improve noise reduction. This helps reduce the "explosive sound" of the compressed air discharged at high speed during valve core 300 switching to below the decibel level allowed by regulations or processes, and prevents increased exhaust back pressure from affecting the switching speed and reliability of the valve core 300.

[0064] It should be understood that in some other implementations of this embodiment, the muffler and filter screen can also be installed on the valve body 100 by means of screws, or the muffler and filter screen can be connected by means of welding or bonding, and then assembled onto the valve body 100 by means of welding or bonding. In this case, even if the exhaust port 110 does not have an internal thread or other structure, it is still possible to install both the muffler and the filter screen in the exhaust port 110.

[0065] In some other implementations of this embodiment, the valve body 100 has a silencer or filter screen located in the exhaust port 110. With this configuration, the gas filtration needs can be met using a single filtration structure by installing either a silencer or a filter screen only in the exhaust port 110, resulting in a simpler structure that is easier to assemble and maintain.

[0066] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An electromagnetic valve characterized by: The solenoid valve includes a valve body (100) and a valve core (300), and the solenoid valve includes a valve cavity (400); the valve core (300) is located in the valve cavity (400), and the valve core (300) includes a valve core body (320) and a piston head (310); the solenoid valve includes a first cavity (410) and a second cavity (420), which are isolated from each other along the moving direction of the piston head (310), and the first cavity (410) is isolated from the second cavity (420). The first cavity (410) and the second cavity (420) are located on both sides of the piston head (310); the wall of the second cavity (420) includes the end wall of the piston head (310), the first cavity (410) includes a ventilation gap (330), the ventilation gap (330) is located between the valve core body (320) and the wall of the first cavity (410), the valve body (100) has an exhaust hole (110), and the ventilation gap (330) communicates with the exhaust hole (110).

2. The solenoid valve according to claim 1, wherein: The solenoid valve includes a pilot valve (200) along the moving direction of the piston head (310). The pilot valve (200) is located on one side of the valve core body (320). The valve body (100) has a first wall portion (170) extending along the moving direction of the piston head (310). When the pilot valve (200) is in the open state and the valve core (300) is in the first stroke position, a portion of the first wall portion (170) is airtightly coupled to the piston head (310). The wall portion corresponding to the second chamber (420) includes a portion of the first wall portion (170).

3. A solenoid valve according to claim 2, wherein: The pilot valve (200) includes a pilot seat (220). Along the moving direction of the piston head (310), the valve body (100) has a first end (180). The pilot seat (220) and the first end (180) are limited or fixed. When the pilot valve (200) is in the open state and the valve core (300) is in the first stroke position, the wall of the second cavity (420) includes a portion of the first wall (170) and the wall of the pilot seat (220).

4. A solenoid valve according to claim 2, characterized in that: The pilot valve (200) includes a pilot seat (220) along the moving direction of the piston head (310). The valve body (100) has a first end (180). The pilot seat (220) and the first end (180) are limited or fixed. The pilot seat (220) has a first wall portion (170) extending along the moving direction of the piston head (310). When the pilot valve (200) is in the open state and the valve core (300) is in the first stroke position, a portion of the first wall portion (170) is airtightly coupled to the piston head (310). The wall portion corresponding to the second cavity (420) includes a portion of the first wall portion (170).

5. A solenoid valve according to claim 4, wherein: The solenoid valve has a wear-resistant component (600) located between the valve core body (320) and the inner wall of the first cavity (410); The wear-resistant part (600) has an air passage (610), which is a hole-shaped or groove-shaped channel, and the air passage (610) is connected to the air gap (330). And / or the ventilation gap (330) includes a mating gap (331) located between the wear-resistant part (600) and the inner wall of the first cavity (410), or the mating gap (331) located between the wear-resistant part (600) and the valve core body (320).

6. A solenoid valve according to claim 5, characterized in that: The valve core body (320) has an assembly groove (321), and the wear-resistant part (600) is partially located in the assembly groove (321).

7. An electromagnetic valve according to any one of claims 1-6, characterized in that: The piston head (310) includes a mating part (311), which mates with the inner wall of the valve chamber (400), and a sealing element (312) is provided between the mating part (311) and the inner wall of the valve chamber (400).

8. A solenoid valve according to claim 7, characterized in that: The mating part (311) has a receiving groove (313), and the sealing element (312) is partially located in the receiving groove (313).

9. A solenoid valve according to claim 1, characterized in that: The valve body (100) has a breathing air passage (120), the ventilation gap (330) is connected to the breathing air passage (120), and the breathing air passage (120) is connected to the exhaust port (110).

10. A solenoid valve according to any one of claims 1 to 9, characterized in that: The solenoid valve includes a muffler and / or a filter, the muffler and / or the filter being located at the vent (110).

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