An electromagnetic valve

Abstract

The utility model belongs to control valve technical field especially relates to a kind of solenoid valve, including valve body, valve rod and pilot valve, the solenoid valve includes valve cavity, the valve rod is located the valve cavity, along the moving direction of the valve rod, the valve rod has first end and second end, the cavity wall of the valve cavity includes first part, the first part is located the valve body, the solenoid valve has first cavity and second cavity, the first end and the first part between first sealing element are provided with.The utility model discloses a kind of solenoid valve, by being provided with first sealing element between the first end of valve rod and the first part of valve body, first cavity and second cavity are isolated, along the moving direction of the valve rod, first cavity and second cavity are located the two sides of first sealing element, so that the gas entering second cavity by pilot valve, directly act on valve rod, help to cancel piston head, and then reduce the size of solenoid valve's valve rod moving direction, realize miniaturization.

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 actuators, it is widely used in pneumatic and fluid 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 pilot valve, allowing the medium to enter the piston chamber, which in turn pushes the piston to move. The piston then drives the valve core, thus switching the air path of the solenoid valve.

[0003] In existing technologies, the piston chamber is typically located separately on the pilot valve, and sufficient space must be reserved for piston movement. However, since the piston stroke of a solenoid valve is fixed in the design according to performance requirements, the size of the pilot valve cannot be reduced by shortening the piston stroke. This results in a long overall length of the solenoid valve, which is not conducive to its miniaturization and limits its application in space-constrained situations. Utility Model Content

[0004] In view of this, the present invention aims to provide a solenoid valve that facilitates miniaturization.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows: An electromagnetic valve includes a valve body, a valve stem, and a pilot valve. The electromagnetic valve includes a valve cavity, with the valve stem located within the valve cavity. Along the direction of movement of the valve stem, the valve stem has a first end and a second end. Along the direction of movement of the valve stem, the first end is closer to the pilot valve than the second end. The cavity wall of the valve cavity includes a first portion located within the valve body. The electromagnetic valve has a first cavity and a second cavity. A first sealing element is provided between the first end and the first portion to isolate the first cavity and the second cavity. Along the direction of movement of the valve stem, the first cavity and the second cavity are located on opposite sides of the first sealing element. The cavity wall corresponding to the second cavity includes the wall portion of the pilot valve and the end wall of the first end.

[0006] Compared with the prior art, the solenoid valve of this utility model has the following advantages: This invention isolates the first chamber and the second chamber by setting a first sealing element between the first end of the valve stem and the first part of the valve body. Along the movement direction of the valve stem, the first chamber and the second chamber are located on both sides of the first sealing element. The cavity wall corresponding to the second chamber includes the wall of the pilot valve and the end wall of the first end, so that the gas passing through the pilot valve enters the second chamber and directly acts on the end wall of the first end of the valve stem. This helps to eliminate the piston head, thereby reducing the size of the valve stem movement direction of the solenoid valve and achieving miniaturization. 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 This is a schematic diagram of the structure of a solenoid valve according to an embodiment of the present invention; Figure 2 for Figure 1 Cross-sectional view of a solenoid valve; Figure 3 for Figure 1 A schematic diagram of the solenoid valve when the valve stem is in the second stroke position; Figure 4 for Figure 1 A schematic diagram of the pilot valve in a solenoid valve; Figure 5 for Figure 1 A schematic diagram of the structure at the first end of the valve stem in a solenoid valve; Figure 6 for Figure 1 A schematic diagram of the structure of the first chamber in a solenoid valve; Figure 7 for Figure 1 A schematic diagram of the valve stem in a solenoid valve.

[0008] Explanation of reference numerals in the attached figures: 100. Valve body; 110. Exhaust port; 120. Breathing airway; 130. Air inlet; 140. Rear cover; 141. First channel; 200, Pilot valve; 210, Pilot passage; 220, Limiting part; 221, Vent clearance; 300, valve stem; 310, first end; 311, first seal; 312, chamfer; 313, receiving groove; 320, second end; 321, second seal; 330, valve stem body; 340, guide cone surface; 400, Valve chamber; 410, First chamber; 420, Second chamber; 430, Third chamber; 440, First part; 450, Second part; 500. Sealing components. 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, a valve stem 300, and a pilot valve 200. The solenoid valve includes a valve cavity 400, with the valve stem 300 located in the valve cavity 400. Along the moving direction of the valve stem 300, the valve stem 300 has a first end 310 and a second end 320. Along the moving direction of the valve stem 300, the first end 310 is closer to the pilot valve 200 than the second end 320. The cavity wall of the valve cavity 400 includes a first portion 440 located in the valve body 100. The solenoid valve has a first cavity 410 and a second cavity 420. A first sealing element 311 is provided between the first end 310 and the first portion 440 to isolate the first cavity 410 and the second cavity 420. Along the moving direction of the valve stem 300, the first cavity 410 and the second cavity 420 are located on both sides of the first sealing element 311. The cavity wall corresponding to the second cavity 420 includes the wall of the pilot valve 200 and the end wall of the first end 310.

[0012] In this embodiment, the valve cavity 400 is the internal space of the solenoid valve formed by the valve body 100 and the pilot valve 200, and the valve cavity 400 can meet the action requirements of the valve stem 300. When the pilot valve is closed, the valve stem 300 moves toward the pilot valve 200. When the valve stem 300 moves, the second chamber 420 may have two states: First, when the first end 310 of the valve stem 300 moves inside the valve body 100, the chamber wall corresponding to the second chamber 420 includes the wall of the pilot valve 200, the wall of the valve body 100, and the end wall of the first end 310. In this case, the second chamber 420 is the space formed by the wall of the valve stem 300, the wall of the valve body 100, and the wall of the pilot valve 200. Second, when the first end 310 of the valve stem 300 enters the pilot valve 200, the chamber wall corresponding to the second chamber 420 includes the wall of the pilot valve 200 and the end wall of the first end 310. In this case, the second chamber 420 is the space formed by the wall of the valve stem 300 and the wall of the pilot valve 200.

[0013] The opening and closing of the pilot valve can be controlled by switching the coil in the pilot valve on and off. Along the movement direction of the valve stem 300, when the pilot valve is open, the movement of the first end 310 away from the pilot valve 200 is defined as the positive direction of the valve stem 300's movement, and when the pilot valve is closed, the movement of the first end 310 towards the pilot valve 200 is defined as the negative direction of the valve stem 300's movement. The following description will use the positive and negative directions of the valve stem 300's movement to briefly illustrate the direction of the valve stem 300's movement.

[0014] refer to Figure 2 When the pilot valve is opened, the gas through the pilot valve 200 enters the second chamber 420 and acts directly on the end wall of the first end 310 of the valve stem 300 to push the valve stem 300 to move forward. When the valve stem 300 moves forward, the outer peripheral wall of the first end 310 can slide and fit against the first part 440 of the cavity wall of the valve chamber 400 to achieve guidance. At this time, the first sealing element 311 can isolate the first chamber 410 and the second chamber 420. In fact, a piston structure is formed at the first end 310 of the valve stem 300, which is equivalent to integrating the original piston head of the solenoid valve onto the valve stem 300.

[0015] Using the above configuration, during operation, the first end 310 of the valve stem 300 acts as a piston, allowing gas entering the second chamber 420 through the pilot valve 200 to directly act on the end wall of the first end 310 of the valve stem 300, pushing the push rod forward. This helps eliminate the piston head and shorten the overall length of the valve chamber 400. While meeting the piston stroke requirements of the solenoid valve, the piston chamber used for the movement of the original piston head can be eliminated or shortened to reduce the overall length of the valve chamber 400. Furthermore, eliminating or shortening the piston chamber on the pilot valve 200 reduces its size, making it shorter and thus contributing to a shorter overall length of the solenoid valve. This miniaturization of the solenoid valve facilitates its application in space-constrained environments. Correspondingly, when the size of the pilot valve 200 remains unchanged, the space on the valve body 100 that originally allowed the valve stem 300 to move can also be shortened. For example, by using the piston chamber on the pilot valve 200 that originally allowed the piston head to move as part of the valve chamber 400, the length of the valve chamber 400 located in the valve body 100 is shortened, thereby making the valve body 100 shorter. This also helps to shorten the overall length of the solenoid valve and achieve miniaturization of the solenoid valve.

[0016] Furthermore, by arranging the first portion 440 of the valve cavity 400 wall on the valve body 100, and providing a first sealing element 311 between the first end 310 and the first portion 440, the first sealing element 311 can continuously isolate and seal the first cavity 410 and the second cavity 420 when the outer peripheral wall of the first end 310 can slide and fit against the first portion 440 of the valve cavity 400 wall to achieve guidance. During the processing, it is only necessary to process the first portion 440 of the valve cavity 400 wall with high precision on the valve body 100 and ensure the fitting accuracy between the first portion 440 of the valve cavity 400 wall and the outer peripheral wall of the first end 310 of the valve stem 300. This reduces the processing and assembly accuracy requirements of the pilot valve 200, which helps to reduce the processing difficulty and production cost of the pilot valve 200, shorten the assembly time of the pilot valve 200, and help to improve the overall assembly efficiency and production efficiency of the solenoid valve.

[0017] Depend on Figure 2 It is understood that this utility model does not involve improvements to the pilot valve and its internal structure. In this embodiment, the coil and other structures of the pilot valve can all adopt the structures found in existing pilot valves. Those skilled in the art can select and set them according to actual needs, and will not be elaborated further here. In addition, the medium in the solenoid valve in this embodiment is only air. In addition, the medium can also be inert gas, carbon dioxide, or other gases.

[0018] refer to Figure 1 The valve body 100 forms the structural basis of the solenoid valve. All other components can be directly or indirectly mounted on the valve body 100 for integrated assembly. Simultaneously, the valve body 100 largely determines the external shape of the solenoid valve. In specific implementations, the structural shape of the valve body 100 can be designed based on a reference, or those skilled in the art can adjust it themselves, as long as it meets the usage requirements.

[0019] Optional, see reference Figure 2 The valve body 100 can be the valve body 100 of a multi-position multi-way solenoid valve. The valve body 100 also includes an air inlet 130 and an air outlet 110 communicating with the valve cavity 400. The valve stem 300 is movable within the valve cavity 400. It should be understood that the number of air inlets 130 and air outlets 110 varies depending on the type of solenoid valve, and the structure of the valve stem 300 also differs. This embodiment does not involve any improvement to the structure of the valve body 100 or the valve stem 300. Those skilled in the art can adjust the structure of the valve body 100 and the valve stem 300 according to the operating requirements of the solenoid valve, as long as the usage requirements of the solenoid valve are met.

[0020] For example, the pilot valve 200 and the valve body 100 can be connected by conventional methods such as bolts, 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 between them and prevent leakage in the valve chamber 400. Correspondingly, the breather port of the original solenoid valve is located 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 port. By providing a sealing component 500 between the pilot valve 200 and the valve body 100, the valve chamber 400 is prevented from directly communicating with the outside atmosphere, ensuring that the solenoid valve is not affected by the external environment during operation and improving the overall dustproof and waterproof performance of the solenoid valve.

[0021] 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 components 500 to achieve the 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 may still have relatively good sealing performance.

[0023] In a preferred embodiment of this example, reference is made to... Figure 2 Along the movement direction of the valve stem 300, the solenoid valve has a first stroke position; the pilot valve 200 has a limiting part 220. When the valve stem 300 is in the first stroke position, the first end 310 and the limiting part 220 abut against each other. Correspondingly, when the pilot valve is closed, the valve stem 300 moves in the opposite direction, the volume of the second chamber 420 gradually decreases, and the gas in the second chamber 420 can be discharged through the pilot valve 200 until the first end 310 of the valve stem 300 abuts against the limiting part 220, at which point the valve stem 300 is in the first stroke position, and the flow channel of the solenoid valve is in one state.

[0024] By using the above-described configuration, a limiting part 220 is provided on the pilot valve 200. The limiting part 220 can limit the movement of the valve stem 300 by abutting against the wall of the first end 310, thereby restricting the extreme position of the valve stem 300 in reverse movement. This helps to improve the movement accuracy of the valve stem 300 when it is in motion and ensures the switching effect of the solenoid valve flow channel.

[0025] It should be understood that, reference Figure 3 The valve body 100 includes a rear cover 140. Along the moving direction of the valve stem 300, the rear cover 140 and the pilot valve 200 are located on opposite sides of the valve body 100. The solenoid valve also has a second stroke position. When the pilot valve is open, the gas passing through the pilot valve enters the second chamber 420 and pushes the valve stem 300 to move forward. The volume of the second chamber 420 gradually increases until the second end 320 of the valve stem 300 abuts against the wall of the rear cover 140 of the valve body 100, at which point the valve stem 300 is in the second stroke position, and the flow path of the solenoid valve switches to another state.

[0026] In a preferred embodiment of this example, reference is made to... Figures 2 to 4 The pilot valve 200 has at least two limiting portions 220, and there is a vent gap 221 between the at least two limiting portions 220. The vent gap 221 is connected to the second chamber 420. With the movement direction of the valve stem 300 as the projection direction, in the projection plane perpendicular to the movement direction of the valve stem 300, the center of the projection of the first end 310 is located between the projections of the at least two limiting portions 220.

[0027] For example, taking the pilot valve 200 with two limiting parts 220 as an example, a venting gap 221 can be formed between the two limiting parts 220. When the pilot valve is opened, the gas passing through the pilot valve can not only quickly diffuse into the second chamber 420 through the venting gap 221, but also flow quickly and evenly along the venting gap 221 to the end wall of the first end 310, so that the gas pressure can act more evenly on the end wall of the first end 310, thereby better pushing the valve stem 300 to move forward and improving the stability of the valve stem 300 when moving forward.

[0028] Optionally, multiple limiting parts 220 can be provided, for example, four limiting parts 220 can be provided, and the four limiting parts 220 are arranged in a ring or radial pattern with the center of the projection of the first end 310 as the center, so that a ventilation gap 221 can be formed between each two adjacent limiting parts 220. At this time, the ventilation gap 221 is cross-shaped, which makes the ventilation gap 221 have a better ventilation effect and further improves the uniformity of gas flow.

[0029] By using the above-described configuration, multiple limiting parts 220 can be provided to form multiple ventilation gaps 221 arranged radially with the center of the projection of the first end 310 as the center. The multiple ventilation gaps 221 help the gas to flow more evenly to the wall of the first end 310 and enable the gas to flow more evenly in the second chamber 420, avoiding the gas from concentrating in a certain place in the second chamber 420, thereby ensuring uniform gas pressure in the second chamber 420 and helping to reduce wear caused by force deviation when the valve stem 300 moves forward.

[0030] It should be understood that in some other implementations of this embodiment, those skilled in the art can also adjust the number and arrangement of the limiting parts 220 according to actual needs, as long as a ventilation space can be formed between at least two limiting parts 220, which will not be elaborated here.

[0031] In a preferred embodiment of this example, reference is made to... Figure 2 and Figure 3 The solenoid valve has a third chamber 430, the wall of which includes the wall of the second end 320. The solenoid valve has a first channel 141, which is connected to the third chamber 430. The pilot valve 200 has a pilot channel 210, which can be connected to or disconnected from the second chamber 420. With the direction of movement of the valve stem 300 as the projection direction, in the projection plane perpendicular to the direction of movement of the valve stem 300, the projected area of ​​the first end 310 is larger than the projected area of ​​the second end 320.

[0032] For example, the cavity wall of the valve cavity 400 includes a second portion 450 located in the valve body 100. A second seal 321 is disposed between the second end 320 and the second portion 450, thereby isolating the second cavity 420 and the third cavity 430. The second seal 321 can also be a sealing ring, coaxially arranged with the second end 320. An assembly groove is provided on the second portion 450 or the second end 320, and the second seal 321 is partially confined within the assembly groove to achieve assembly of the second seal 321. By providing a single second seal 321, the sealing requirements during the movement of the valve stem 300 can be met, simplifying the structure and improving the assembly efficiency of the second seal 321.

[0033] It should be understood that those skilled in the art can also select a suitable second sealing element 321 according to actual sealing needs to achieve a seal between the second part 450 and the second end 320, thereby preventing gas exchange between the second cavity 420 and the third cavity 430. Furthermore, the second sealing element 321 can also be installed on the second part 450 or the second end 320 by adhesive bonding; in this case, even without the aforementioned mounting groove, the assembly of the second sealing element 321 can be achieved.

[0034] In this embodiment, the third cavity 430 can meet the operational requirements of the second end 320 of the valve stem 300. When the valve stem 300 moves, the third cavity 430 may exist in two states: First, when the valve stem 300 moves in the reverse direction, from the second stroke position to the first stroke position, or when the valve stem 300 is in the first stroke position, the cavity wall corresponding to the third cavity 430 includes the wall of the rear cover 140, the wall of the valve body 100, and the end wall of the second end 320. In this case, the third cavity 430 is the space formed by the wall of the rear cover 140, the wall of the valve body 100, and the end wall of the second end 320. Second, when the valve stem 300 is in the second stroke position, the cavity wall corresponding to the third cavity 430 includes the wall of the rear cover 140 and the end wall of the second end 320. In this case, the third cavity 430 is the space formed by the wall of the rear cover 140 and the end wall of the second end 320.

[0035] When the pilot valve is opened, the pilot channel 210 is connected to the second chamber 420. The gas passing through the pilot valve 200 enters the second chamber 420 through the pilot channel 210 and generates air pressure in the second chamber 420. When the air pressure in the second chamber 420 is greater than or equal to the air pressure in the third chamber 430, since the projected area of ​​the first end 310 is greater than the projected area of ​​the second end 320, and since the force is equal to the air pressure multiplied by the area, the force of the gas in the second chamber 420 pushing the first end 310 is greater than the force of the gas in the third chamber 430 pushing the first end 310, thereby causing the valve stem 300 to start moving in the forward direction.

[0036] Correspondingly, when the pilot valve is closed, the pilot channel 210 is disconnected from the second chamber 420. When the air pressure in the third chamber 430 is greater than the air pressure in the second chamber 420, and the thrust received by the second end 320 is greater than the thrust received by the second end 320, the valve stem 300 moves in the reverse direction. During this reverse movement, the volume of the second chamber 420 gradually decreases, and the gas in the second chamber 420, after being compressed, is discharged through the pilot valve 200 to meet the movement requirements of the valve stem 300.

[0037] By configuring the first end 310 with a larger projected area than the second end 320, the area difference helps reduce the pressure requirement in the second chamber 420. This allows the valve stem 300 to move forward when the pressure in the second chamber 420 equals the pressure in the third chamber 430, improving the sensitivity of the valve stem 300 at initial operation. Simultaneously, it reduces the external air pressure requirement for the pilot channel 210 during actual use, allowing for low-pressure air supply to meet the valve's operational needs and reducing operating costs.

[0038] Optional, see reference Figure 2 and Figure 3The first channel 141 can be connected to a first external gas supply device to discharge and replenish gas in the third chamber 430. The pilot channel 210 can be connected to a second external gas supply device to replenish gas in the second chamber 420. When the pilot valve is open, the pilot passage is connected to the second chamber 420, and gas can be replenished into the second chamber 420 using the second external gas supply device. The gas pressure pushes the second valve stem 300 to move forward and compresses the gas in the third chamber 430. At this time, the gas in the third chamber 430 can be discharged into the first external gas supply device to meet the movement requirements of the valve stem 300. Correspondingly, when the pilot valve is closed, gas is replenished into the third chamber 430 using the first external gas supply device. The replenished gas generates gas pressure, thereby using the pressure difference between the second chamber 420 and the third chamber 430 to push the valve stem 300 to move in the reverse direction.

[0039] It should be understood that the first and second external gas supply devices can also be the same external gas supply device. By using only one external gas supply device, the external gas circuit structure of the solenoid valve can be simplified. When the pilot valve is open and the pilot channel 210 is open, it can provide gas at the same pressure to the second chamber 420 and the third chamber 430. At this time, even if the gas pressure in the second chamber 420 and the third chamber 430 is the same, because the projected area of ​​the first end 310 is larger than the projected area of ​​the second end 320, the gas driving force on the first end 310 will still be greater than the driving force on the second end 320, so that the valve stem 300 can move in the forward direction. Correspondingly, when the pilot valve is closed and the pilot channel 210 is disconnected, it is only necessary to ensure that the gas pressure in the third chamber 430 is greater than the gas pressure in the pilot valve 200, and that the pushing force on the second end 320 is greater than the pushing force on the first end 310, so that the valve stem 300 can move in the opposite direction and squeeze the gas in the second chamber 420, so that the gas in the second chamber 420 can enter the pilot valve 200 or be discharged through the pilot valve 200.

[0040] In a preferred embodiment of this example, reference is made to... Figure 5 and Figure 6 The first portion 440 or the first end 310 has a receiving groove 313, and the first seal 311 is partially confined within the receiving groove 313. By providing the receiving groove 313 on the first portion 440 or the first end 310, the receiving groove 313 can play a good limiting role for the first seal 311, ensuring that the first seal 311 can continuously and stably seal between the first portion 440 and the first end 310 when the valve stem 300 moves.

[0041] For example, the first end 310 has a receiving groove 313, which allows the receiving groove 313 to move with the first end 310, thus meeting the moving sealing requirements of the long-stroke valve stem 300. At this time, the outer wall of the first sealing member 311 cooperates with the first portion 440 of the valve cavity 400 cavity wall to perform a sealing function, ensuring that the first sealing member 311 can continuously perform a sealing function during the movement of the valve stem 300.

[0042] Alternatively, the first part 440 has a receiving groove 313, that is, the receiving groove 313 is provided on the valve body 100, so that the first sealing element 311 can be assembled on the valve body 100. In this case, the first sealing element 311 does not move with the valve stem 300, the first sealing element 311 is more stable, and the inner side wall of the first sealing element 311 cooperates with the outer peripheral wall of the first end 310 to play a sealing role, and can also ensure that the first sealing element 311 can continue to play a sealing role during the movement of the valve stem 300.

[0043] It should be understood that in some other implementations of this utility model, even without the receiving groove 313, the first sealing member 311 can be assembled and fixed on the first part 440 or the first end 310 by means of bonding or other methods, and play a sealing role during the movement of the valve stem 300.

[0044] Optionally, the first sealing element 311 is a sealing ring, which is coaxially arranged with the first end 310. For example, the first sealing element 311 can be a bidirectional sealing ring such as an O-ring rubber sealing ring. By setting one first sealing element 311, the sealing requirements during the movement of the valve stem 300 can be met, simplifying the structure and improving the assembly efficiency of the first sealing element 311. It should be understood that those skilled in the art can also select a suitable first sealing element 311 according to actual sealing needs to achieve a seal between the first part 440 and the first end 310, thereby preventing gas exchange between the first cavity 410 and the second cavity 420.

[0045] In a preferred embodiment of this example, reference is made to... Figure 2 , Figure 5 and Figure 6 The valve stem 300 has a valve stem body portion 330 and a guide cone surface 340. The valve stem body portion 330 is located between the first end portion 310 and the second end portion 320. The valve stem body portion 330 is coaxially arranged with the first end portion 310. With the movement direction of the valve stem 300 as the projection direction, in the projection plane perpendicular to the movement direction of the valve stem 300, the projection area of ​​the first end portion 310 is larger than the projection area of ​​the valve stem body portion 330. The guide cone surface 340 is a transition surface formed by extending from the outer peripheral wall edge of the first end portion 310 to the outer peripheral wall of the valve stem body portion 330.

[0046] With the above configuration, during the assembly of the solenoid valve, the second end 320 of the valve stem 300 needs to be assembled into the valve cavity 400 first, and then the valve stem body 330 and the first end 310 are assembled into the valve cavity 400. During the assembly of the first end 310, the guide cone surface 340 can cooperate with the inner wall of the valve cavity 400 to provide guidance, facilitating the alignment of the first end 310 into the valve cavity 400. This reduces the assembly difficulty of the valve stem 300 and improves its assembly efficiency. Furthermore, the guide cone surface 340 can prevent the first end 310 from scratching the inner wall of the valve cavity 400 when the valve stem 300 moves forward, thus improving the reliability of the valve stem 300 during movement within the valve cavity 400.

[0047] Optional, see reference Figure 5 and Figure 6 The second end 320 has a chamfer 312 on the edge facing the pilot valve 200. For example, the chamfer 312 can be a 45° chamfer, an oblique chamfer, or a rounded chamfer. By setting the chamfer 312 on the edge of the second end 320, when the valve stem 300 moves in the reverse direction, the chamfer 312 can also prevent the edge of the second end 320 from scratching the cavity wall of the valve cavity 400, preventing the valve stem 300 from getting stuck or jammed, which helps to further improve the reliability of the valve stem 300 when it moves in the valve cavity 400.

[0048] In a preferred embodiment of this example, reference is made to... Figure 7 The valve stem 300 is integrally injection molded. Adopting an integral structure for the valve stem 300 improves the overall structural strength of the valve stem 300. Furthermore, compared to other molding methods, integral injection molding of the valve stem 300 offers higher production and processing efficiency, reduces the difficulty of manufacturing and processing the valve stem 300, and thus lowers production costs.

[0049] In a preferred embodiment of this example, reference is made to... Figure 2 , Figure 3 and Figure 6 The valve body 100 has a vent 110, which is connected to the first chamber 410. By connecting the vent 110 to the first chamber 410, when the valve stem 300 moves forward or backward, causing a change in the volume of the first chamber 410, the gas in the first chamber 410 can be discharged or replenished through the vent 110, ensuring stable pressure in the first chamber 410 and preventing the pressure in the first chamber 410 from affecting the movement of the valve stem 300.

[0050] In a preferred embodiment of this example, reference is made to... Figure 2 and Figure 6 The solenoid valve has a silencer and / or filter, which is located at the exhaust port 110.

[0051] Optionally, the solenoid valve includes a silencer located at the exhaust port 110. For example, the silencer may be a porous structure that reduces the "explosive" sound of compressed air discharged at high speed during valve switching to below the decibel level permitted by regulations or processes, while minimizing the increase in exhaust back pressure that could affect the valve's switching speed and reliability. Furthermore, the porous structure of the silencer can also filter external particles, preventing backflow and avoiding the backflow of workshop dust and coolant droplets into the valve chamber 400 via the exhaust port 110, which could cause valve core and piston head jamming.

[0052] It should be understood that in some other implementations of this utility model, the silencer and the valve body 100 can be connected by means of snap-fit, adhesive, threaded connection, screw connection, etc., and a sealing structure can also be provided at the connection between the silencer and the valve body 100 when necessary.

[0053] Optionally, the solenoid valve includes a filter screen located at the exhaust port 110. This filter screen can be a single-layer or multi-layer metal filter screen, such as one made of stainless steel or aluminum alloy, which offers better high-temperature resistance and corrosion resistance, and a wider range of applicable media. Alternatively, the filter screen can be a conical or cylindrical filter screen, which has a larger filtration area and is less prone to clogging, making it more suitable for high-pressure gas exhaust ports 110.

[0054] For example, the filter screen can be installed on the valve body 100 by flange clamping, or by screws or compression sleeves. If necessary, a sealing structure can also be provided at the connection between the filter screen and the valve body 100.

[0055] It should be understood that in some other implementations of this utility model, those skilled in the art can select a suitable type of filter screen according to actual needs and install it using other installation methods such as bonding, so as to achieve the filter screen filtering the exhaust hole 110, so that the filter screen can play the role of preventing foreign objects from being sucked back into the valve cavity 400.

[0056] Optionally, the solenoid valve includes a silencer and a filter screen, both located in the vent port 110. For example, the silencer and valve body 100 are connected by threads, as are the filter screen and valve body 100. The inner wall of the vent 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 vent 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.

[0057] It should be understood that in some other implementations of this embodiment, the silencer and the filter screen can be connected by welding or bonding and then assembled onto the valve body 100 as a whole. In this case, even if the aforementioned threaded hole structure is not available, the silencer can still be installed on the valve body 100 by using other installation methods such as bonding or screw connection.

[0058] In a preferred embodiment of this example, reference is made to... Figure 2 and Figure 6 The valve body 100 has a breathing air passage 120, with the first chamber 410 connected to the breathing air passage 120 and the breathing air passage 120 connected to 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 first chamber 410, and the other end is connected to the exhaust port 110. When the valve stem 300 moves forward and backward, causing a change in the volume of the first chamber 410, the gas in the first chamber 410 can be discharged or replenished through the breathing air passage 120 and the exhaust port 110, ensuring stable pressure within the first chamber 410 and preventing the pressure within the first chamber 410 from affecting the movement of the valve stem 300.

[0059] For example, the exhaust port 110 communicating with the first chamber 410 can be the exhaust port 110 closest to the pilot valve 200, and the exhaust port 110 is connected to the first chamber 410 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 arrangement of the exhaust port 110 causes less change to the structure of the valve body 100 and is easier to implement and manufacture.

[0060] Optionally, the exhaust port 110 communicating with the first chamber 410 can also be an exhaust port 110 at any position on the valve body 100. Taking the exhaust port 110 furthest from the pilot valve 200, i.e. the exhaust port 110 on the side of the rear cover 140 of the valve body 100, as an example, by setting a breathing air passage 120 on the valve body 100, and communicating one end of the breathing air passage 120 with the aforementioned exhaust port 110 and the other end with the first chamber 410, the gas flow requirements can also be met.

[0061] 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 to the first chamber 410, or it can connect multiple exhaust holes 110 to the first chamber 410. These methods can achieve the connection between the first chamber 410 and the exhaust holes 110, thereby satisfying the movement requirements of the valve stem 300. 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.

[0062] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been further described through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. An electromagnetic valve characterized by comprising: The solenoid valve includes a valve body (100), a valve stem (300), and a pilot valve (200). The solenoid valve includes a valve cavity (400). The valve stem (300) is located within the valve cavity (400). Along the direction of movement of the valve stem (300), the valve stem (300) has a first end (310) and a second end (320). Along the direction of movement of the valve stem (300), the first end (310) is closer to the pilot valve (200) than the second end (320). The cavity wall of the valve cavity (400) includes a first portion (440). 40) Located in the valve body (100), the solenoid valve has a first chamber (410) and a second chamber (420), a first seal (311) is provided between the first end (310) and the first part (440), and the first chamber (410) and the second chamber (420) are isolated; along the moving direction of the valve stem (300), the first chamber (410) and the second chamber (420) are located on both sides of the first seal (311), and the cavity wall corresponding to the second chamber (420) includes the wall of the pilot valve (200) and the end wall of the first end (310).

2. The solenoid valve according to claim 1, wherein: Along the moving direction of the valve stem (300), the solenoid valve has a first stroke position; the pilot valve (200) has a limiting part (220), and when the valve stem (300) is in the first stroke position, the first end (310) and the limiting part (220) abut against each other.

3. A solenoid valve according to claim 2, wherein: The pilot valve (200) has at least two limiting portions (220), and there is a vent gap (221) between the at least two limiting portions (220). The vent gap (221) is connected to the second chamber (420). With the movement direction of the valve stem (300) as the projection direction, in the projection plane perpendicular to the movement direction of the valve stem (300), the center of the projection of the first end (310) is located between the projections of the at least two limiting portions (220).

4. The solenoid valve according to claim 1, wherein: The solenoid valve has a third chamber (430), the wall of which includes the wall of the second end (320). The solenoid valve has a first channel (141) that is connected to the third chamber (430). The pilot valve (200) has a pilot channel (210) that is connected to or disconnected from the second chamber (420). With the direction of movement of the valve stem (300) as the projection direction, in the projection plane perpendicular to the direction of movement of the valve stem (300), the projected area of ​​the first end (310) is greater than the projected area of ​​the second end (320).

5. An electromagnetic valve according to any one of claims 1 to 4, characterized in that: The first portion (440) or the first end (310) has a receiving groove (313), and the first seal (311) is partially confined within the receiving groove (313).

6. The solenoid valve according to claim 1, wherein: The valve stem (300) has a valve stem body (330) and a guide cone surface (340). The valve stem body (330) is located between the first end (310) and the second end (320). The valve stem body (330) is coaxially arranged with the first end (310). With the moving direction of the valve stem (300) as the projection direction, in the projection plane perpendicular to the moving direction of the valve stem (300), the projected area of ​​the first end (310) is larger than the projected area of ​​the valve stem body (330). The guide cone surface (340) extends from the outer peripheral wall edge of the first end (310) to the outer peripheral wall of the valve stem body (330).

7. The solenoid valve according to claim 1, wherein: The valve stem (300) is integrally injection molded.

8. The solenoid valve according to claim 1, wherein: The valve body (100) has an exhaust port that is connected to the first cavity (410).

9. A solenoid valve according to claim 8, characterized in that: The solenoid valve has a muffler and / or filter screen located at the vent (110).

10. A solenoid valve according to claim 8 or 9, characterized in that: The valve body (100) has a breathing air passage (120), the first chamber (410) is connected to the breathing air passage (120), and the breathing air passage (120) is connected to the exhaust port (110).

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