Solenoid valve

Abstract

The present application provides a solenoid valve. The solenoid valve comprises: a valve body assembly having a valve cavity and a first valve port; a first core assembly fixedly connected to the valve body assembly; a second core assembly movably arranged in the valve cavity; a piston assembly movably arranged in the valve cavity and located at the side of the first core assembly distant from the second core assembly, the piston assembly having a second valve port; and a valve needle assembly movably arranged in the valve cavity and connected to the second core assembly, wherein when the solenoid valve is in an energized state, the first core assembly and the second core assembly attract each other; one end of the valve needle assembly closes the second valve port, and the other end of the valve needle assembly abuts against the second core assembly; the piston assembly closes the first valve port; and a gap H is formed between the second core assembly and the first core assembly. The technical solution provided by the present application can solve the problem in the prior art that noise is generated due to impact when the second core assembly of the solenoid valve is attracted to and engages with the first core assembly.

Description

Solenoid valve

[0001] This application claims priority to the patent application filed on January 17, 2025, with China National Intellectual Property Administration, application number 202510081751.9, entitled "Solenoid Valve". Technical Field

[0002] This application relates to the field of solenoid valve technology, and more specifically, to a solenoid valve. Background Technology

[0003] Existing solenoid valves exhibit noise issues during operation, particularly when energized. The second core assembly moves towards the first core assembly under electromagnetic force, and the moment they engage generates a significant impact sound. With increasing customer demand for lower noise levels, existing solenoid valves fail to meet these requirements. Summary of the Invention

[0004] This application provides a solenoid valve to solve the problem in the prior art where the second core iron assembly of the solenoid valve will collide and generate noise when it engages with the first core iron assembly.

[0005] This application provides a solenoid valve, comprising: a valve body assembly having a valve cavity and a first valve port, the first valve port being disposed at one end of the valve cavity and communicating with the valve cavity; a first core iron assembly fixedly connected to the valve body assembly; a second core iron assembly movably disposed within the valve cavity; a piston assembly movably disposed within the valve cavity and located on the side of the first core iron assembly away from the second core iron assembly, the piston assembly having a second valve port; and a valve needle assembly movably disposed within the valve cavity and connected to the second core iron assembly; wherein, when the solenoid valve is energized, the first core iron assembly and the second core iron assembly attract each other; one end of the valve needle assembly closes the second valve port, and the other end of the valve needle assembly abuts against the second core iron assembly; the piston assembly closes the first valve port; and a gap H exists between the second core iron assembly and the first core iron assembly.

[0006] Applying the technical solution of this application, when the solenoid valve is energized, one end of the valve needle assembly closes the second valve port, and the other end of the valve needle assembly abuts against the second core iron assembly. The piston assembly closes the first valve port, and at this time, there is a gap H between the second core iron assembly and the first core iron assembly. Thus, the extended valve needle assembly can limit the movement of the second core iron assembly, preventing it from descending and contacting the first core iron assembly after energization. This avoids the impact that would generate significant noise when the second and first core iron assemblies contact, thereby reducing the noise generated when the solenoid valve closes and improving the user's comfort. Simultaneously, it can also reduce wear caused by impact between the second and first core iron assemblies, extending the service life of the solenoid valve.

[0007] Furthermore, the end of the second core iron assembly facing the first core iron assembly is provided with an abutment member, which together with the second core iron assembly form a mounting cavity. One end of the valve needle assembly is located inside the mounting cavity, and the other end of the valve needle assembly extends out of the mounting cavity and seals with the second valve port. An elastic element is located inside the mounting cavity between the valve needle assembly and the abutment member, providing a force for the valve needle assembly to move away from the second valve port. Thus, after power is cut off, the elastic element can drive the valve needle assembly to move away from the first valve port relative to the second core iron assembly, ensuring that, in the power-off state, there is sufficient distance between the bottom of the valve needle assembly and the second valve port to guarantee the opening degree of the second valve port.

[0008] Furthermore, one end of the valve needle assembly has a first stepped surface, and an elastic element extending axially along the solenoid valve is sandwiched between the first stepped surface and the abutment. The first stepped surface and the abutment cooperate with each other, providing installation space for the elastic element and ensuring the stability of the elastic element's actuation.

[0009] Furthermore, the valve needle assembly also has a second stepped surface, which is located between the first stepped surface and the abutment. When the solenoid valve is energized, the distance between the second stepped surface and the abutment is L. After de-energization, the second core iron assembly moves upward until the abutment abuts against the second stepped surface of the valve needle assembly. During this movement, the distance the second core iron assembly moves relative to the first core iron assembly is L. This movement is defined as the idle stroke of the second core iron assembly. Without driving the valve needle assembly to move, the idle stroke allows the second core iron assembly to easily obtain a sufficiently large speed so that it can quickly drive the valve needle assembly to open the second valve port in the subsequent process. The idle stroke also allows the second core iron assembly to easily obtain a sufficiently large speed and move together with the valve needle assembly in a direction away from the first valve port. That is, the second core iron assembly after the idle stroke has a stronger valve opening capability.

[0010] Furthermore, the mounting cavity includes a first inner sidewall opposite to the abutment, and one end of the valve needle assembly is confined between the first inner sidewall and the abutment. The first inner sidewall and the abutment can limit the end of the valve needle assembly, thereby limiting the movement stroke of the valve needle assembly within the valve cavity, preventing excessive movement of the valve needle assembly within the valve cavity, and improving the reliability of the valve needle assembly movement.

[0011] Furthermore, the first core iron assembly has a receiving cavity at one end near the second core iron assembly, and the receiving cavity is correspondingly arranged with the abutment; when the solenoid valve is energized, the abutment is located inside the receiving cavity and contacts the inner wall of the receiving cavity; or, there is a gap between the abutment and the inner wall of the receiving cavity. These features reduce the noise generated when the solenoid valve is closed, improving the user experience.

[0012] Furthermore, the abutment includes a first segment and a second segment arranged sequentially. The first segment is located inside the mounting cavity, and the second segment is located outside the mounting cavity. The outer diameter of the second segment is larger than that of the first segment. The second segment is fitted and connected to the end face of the second core iron assembly relative to the first core iron assembly. The second segment increases the contact area between the abutment, the first core iron assembly, and the first spring, improving the stability of the interaction between the first spring, the first core iron assembly, and the abutment, and ensuring the reliability of the drive. The abutment prevents direct contact between the second core iron assembly (excluding the abutment) and the first core iron assembly, reducing collision noise.

[0013] Furthermore, the solenoid valve also includes a buffer element disposed at the end of the second core iron assembly away from the first valve port; the valve body assembly also includes a sleeve, with the second core iron assembly located inside the sleeve, and the buffer element facing the sleeve. The buffer element is used to abut against the sleeve, and the buffer element can buffer the impact of the second core iron assembly on the sleeve, so as to further reduce the noise generated by the collision between the second core iron assembly and the sleeve, and improve the user experience.

[0014] Furthermore, the first core iron assembly has a through hole along the movement direction of the valve needle assembly, through which the valve needle assembly passes. The solenoid valve also includes a first spring, one end of which is located inside the through hole and abuts against the first core iron assembly, and the other end of which abuts against a contact member. The first spring can provide a force to the second core iron assembly away from the first core iron assembly. When the solenoid valve is energized, the first spring is compressed; when the solenoid valve is de-energized, the second core iron assembly loses the force of the coil assembly, releasing part of the pressure on the first spring. At this time, the first spring is released, causing the second core iron assembly to move away from the first core iron assembly, driving the solenoid valve to open, thus increasing the smoothness of valve opening.

[0015] Furthermore, the solenoid valve is powered by direct current (DC). The magnetic field generated by DC in the magnet is constant, without hysteresis or eddy current losses, thus reducing coil heating. Especially when there is a gap between the second and first core iron assemblies while energized, DC significantly reduces the heat generated by the two core iron assemblies, extending the solenoid valve's lifespan. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0017] Figure 1 shows a schematic diagram of the structure of the solenoid valve provided in this application when it is in the de-energized state;

[0018] Figure 2 shows a schematic diagram of the structure of the solenoid valve provided in this application when it is energized;

[0019] Figure 3 shows a magnified view of a portion of point A in Figure 2;

[0020] Figure 4 shows a schematic diagram of another embodiment of the solenoid valve provided in this application.

[0021] The above-mentioned figures include the following reference numerals: 10, valve body assembly; 101, valve cavity; 102, first valve port; 103, second valve port; 11, valve seat; 12, sleeve; 111, first flow cavity; 112, second flow cavity; 20, first core iron assembly; 201, through hole; 202, receiving cavity; 203, protruding structure; 204, stepped structure; 30, second core iron assembly; 301, mounting cavity; 302, first balance channel; 40, piston assembly; 41, valve core; 411, connecting hole; 410, second balance channel; 420, third balance channel; 42, second spring; 43, seal; 50, valve needle assembly; 501, second stepped surface; 502, first stepped surface; 51, notch; 60, elastic element; 70, abutment element; 71, first section; 72, second section; 80, buffer element; 90. The first spring. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0023] As shown in Figures 1 and 2, this application provides an embodiment of a solenoid valve, which includes: a valve body assembly 10, a first core iron assembly 20, a second core iron assembly 30, a piston assembly 40, and a valve needle assembly 50. The valve body assembly 10 has a valve cavity 101 and a first valve port 102, the first valve port 102 being disposed at one end of the valve cavity 101 and communicating with the valve cavity 101. The first core iron assembly 20 is fixedly connected to the valve body assembly 10. The second core iron assembly 30 is movably disposed at the end of the valve cavity 101 away from the first valve port 102, and the second core iron assembly 30 can magnetically engage with the first core iron assembly 20. The piston assembly 40 is movably disposed within the valve cavity 101, located on the side of the first core iron assembly 20 away from the second core iron assembly 30, and the piston assembly 40 has a second valve port 103. The second core iron assembly 30 is drivenly connected to the piston assembly 40, and the piston assembly 40 is used to open or close the first valve port 102. The valve needle assembly 50 is movably disposed within the valve cavity 101 and connected to the second core iron assembly 30. The second core iron assembly 30 can drive the valve needle assembly 50 to move within the valve cavity 101, and the second core iron assembly 30 drives the valve needle assembly 50, thereby indirectly driving the piston assembly 40.

[0024] The solenoid valve has both a de-energized and an energized state. When the solenoid valve is de-energized, the distance between the second core iron assembly 30 and the first core iron assembly 20 is the greatest, and there is no attraction between them. At this time, both the first valve port 102 and the second valve port 103 are open. When the solenoid valve is energized, the first core iron assembly 20 and the second core iron assembly 30 attract each other. The second core iron assembly 30 drives the valve needle assembly 50 to move closer to the first core iron assembly 20. After the valve needle assembly 50 closes the second valve port 103, it moves downward together with the piston assembly 40 until the first valve port 102 is closed. The final state is that the distance between the second core iron assembly 30 and the first core iron assembly 20 is the smallest, and both the first valve port 102 and the second valve port 103 are closed. There is always a gap between the second core iron assembly 30 and the first core iron assembly 20 in both the energized and de-energized states. The gap is formed when the power is on by extending the valve needle assembly 50. The longer valve needle assembly 50 can limit the second core iron assembly 30 and prevent the second core iron assembly 30 from moving to fit with the first core iron assembly 20 after being powered on. This can avoid the collision when the second core iron assembly 30 and the first core iron assembly 20 are attracted, thereby reducing the noise generated by the solenoid valve when it is closed, improving the comfort of the operator, and also reducing the wear caused by the collision between the second core iron assembly 30 and the first core iron assembly 20, thus extending the service life of the solenoid valve.

[0025] When the solenoid valve is de-energized, the second core iron assembly 30 separates from the first core iron assembly 20. The second core iron assembly 30 drives the valve needle assembly 50 to disengage from the second valve port 103, and the second valve port 103 opens. Subsequently, the piston assembly 40 moves upward under the impact of the fluid pressure difference in the valve chamber 101, and the first valve port 102 opens.

[0026] Similar to existing technologies, this embodiment ensures that, in the power-off state, the bottom of the valve needle assembly 50 and the second valve port 103 have sufficient length (i.e., opening), guaranteeing that the second valve port 103 is fully open and preventing insufficient length from preventing the second valve port 103 from being filled with fluid. However, because this embodiment increases the length of the valve needle assembly 50 to avoid collision between the second core iron assembly 30 and the first core iron assembly 20, how can the increased length of the valve needle assembly 50 be maintained while ensuring sufficient length between the bottom of the valve needle assembly 50 and the second valve port 103 in the power-off state? The solution in this embodiment is to provide a mounting cavity 301 at the end of the second core iron assembly 30 facing the first core iron assembly 20, and to provide an elastic element 60 within the mounting cavity 301.

[0027] As shown in Figure 3, the second core iron assembly 30 has a mounting cavity 301 at its end near the first core iron assembly 20. An abutment member 70 is provided at the end of the second core iron assembly 30 facing the first core iron assembly 20, forming the mounting cavity 301 with the second core iron assembly 30. The abutment member 70 can be separately mounted from the first core iron assembly 20 and then connected to it, or it can be part of the first core iron assembly 20. One end of the valve needle assembly 50 is movably disposed within the mounting cavity 301, and an elastic member 60 is located within the mounting cavity 301 and between the valve needle assembly 50 and the abutment member 70. One end of the elastic member 60 abuts against the end of the valve needle assembly 50 near the second core iron assembly 30, and the other end of the elastic member 60 abuts against the abutment member 70. The elastic member 60 provides a force for the valve needle assembly 50 to move away from the second valve port 103. After power is cut off, the elastic element 60 can drive the valve needle assembly 50 to move away from the second valve port 103 relative to the second core iron assembly 30, ensuring that the bottom of the valve needle assembly 50 has sufficient distance from the second valve port 103 when power is cut off.

[0028] To facilitate the installation of the elastic element 60, one end of the valve needle assembly 50 has a first stepped surface 502, and the elastic element 60, extending axially along the solenoid valve, is sandwiched between the first stepped surface 502 and the abutment 70. To limit the end of the valve needle assembly 50, the mounting cavity 301 includes a first inner sidewall opposite to the abutment 70, and one end of the valve needle assembly 50 is limited to be located between the first inner sidewall and the abutment 70. After power is cut off, the second core iron assembly 30 moves upward relative to the first core iron assembly 20 by a certain distance, while the valve needle assembly remains stationary relative to the first core iron assembly 20. The elastic element 60 increases in compression until it reaches its maximum compression. This movement process is defined as the idle stroke of the second core iron assembly 30. Without driving the valve needle assembly 50 to move, the idle stroke allows the second core iron assembly 30 to easily obtain a sufficiently high speed so that it can quickly drive the valve needle assembly 50 to open the second valve port 103. At the same time, during the idle stroke, a gap is formed between the valve needle assembly 50 and the first inner sidewall. Afterward, the second core iron assembly 30 and the valve needle assembly 50 move upward together. Finally, the valve needle assembly 50 moves relative to the second core iron assembly 30 until it is in contact with the first inner sidewall. That is, the elastic force of the elastic element 60 drives the valve needle assembly 50 to move upward, ensuring that the bottom of the valve needle assembly 50 has sufficient distance from the second valve port 103 to ensure the opening degree of the second valve port 103.

[0029] To facilitate control over the upward movement distance of the second core iron assembly 30 relative to the first core iron assembly 20 after power failure (i.e., the idle stroke length of the second core iron assembly 30), the valve needle assembly 50 also has a second stepped surface 501, which is located between the first stepped surface 502 and the abutment member 70. When the solenoid valve is energized, the distance between the second stepped surface 501 and the abutment member 70 is L.

[0030] The specific process is as follows: After power is cut off, the second core iron assembly 30 moves upward until the abutment 70 abuts against the second stepped surface 501 of the valve needle assembly 50. During this movement, the second core iron assembly 30 moves a distance L relative to the first core iron assembly 20. The valve needle assembly 50 does not move under the action of fluid pressure difference, and the elastic element 60 increases in compression. This movement process is defined as the idle stroke of the second core iron assembly 30. Without driving the valve needle assembly 50 to move, the idle stroke allows the second core iron assembly 30 to easily obtain a sufficiently large speed so that it can quickly drive the valve needle assembly 50 to open the second valve port 103 in the subsequent process. At the same time, the idle stroke creates a gap between the valve needle assembly 50 and the first inner wall. Afterward, when the abutment 70 abuts against the second stepped surface 501 of the valve needle assembly 50, the second core iron assembly 30 moves together with the valve needle assembly 50 at a sufficiently large speed in a direction away from the first valve port 102, i.e., the idle stroke. The second core iron assembly 30 after the process has a stronger valve opening capability; finally, under the elastic force of the elastic element 60, the valve needle assembly 50 moves relative to the second core iron assembly 30 to fit against the first inner sidewall, eliminating the gap between the valve needle assembly 50 and the first inner sidewall, that is, the elastic force of the elastic element 60 drives the valve needle assembly 50 to move upward, ensuring that the bottom of the valve needle assembly 50 has sufficient distance from the second valve port. The setting of the elastic element 60 increases the travel of the valve needle assembly 50 when it moves away from the first valve port 102. The elastic element 60 is a spring, or it can be other elastic structures.

[0031] One side of the abutment 70 abuts against the elastic member 60. The abutment 70 increases the contact area between the second core iron assembly 30 and the first spring 90, increases the stability of the drive between the first spring 90 and the second core iron assembly 30, reduces shaking during opening and closing, and further reduces the noise of the system operation.

[0032] The abutment 70 is made of metal, and can be fixedly connected to the second core iron assembly 30 by welding, making operation convenient.

[0033] In this embodiment, the abutment 70 is a gasket, and part of it is located within the mounting cavity 301. The valve needle assembly 50 passes through the abutment 70, resulting in a simple structure and convenient processing. In other embodiments, the abutment 70 can also be configured as a sleeve or other structure.

[0034] As shown in Figure 3, the first core iron assembly 20 has a receiving cavity 202 at one end near the second core iron assembly 30. The receiving cavity 202 is correspondingly arranged with the abutment member 70. When the second core iron assembly 30 and the first core iron assembly 20 are engaged, the abutment member 70 is located inside the receiving cavity 202, and there is a gap between the abutment member 70 and the inner wall of the receiving cavity 202 so as not to contact each other. The receiving cavity 202 is located at the end of the mounting cavity 301 near the second core iron assembly 30. Through the above arrangement, the abutment member 70 is prevented from colliding with the first core iron assembly 20 when the solenoid valve is closed, further reducing the noise generated when the solenoid valve is closed and improving the user experience. In addition, when the abutment member 70 is made of plastic or rubber, the abutment member 70 can also contact the inner wall of the receiving cavity 202.

[0035] The abutment member 70 includes a first segment 71 and a second segment 72. The first segment 71 is located inside the mounting cavity 301, and the second segment 72 is located outside the mounting cavity 301. The outer diameter of the second segment 72 is larger than the outer diameter of the first segment 71. The second segment 72 is in close contact with the end face of the second core iron assembly 30 relative to the first core iron assembly 20. The second segment 72 increases the contact area between the abutment member 70, the first core iron assembly 20, and the first spring 90, thereby improving the stability of the interaction between the first core iron assembly 20, the first spring 90, and the abutment member 70 and ensuring the reliability of the drive. The first spring 90 is located between the second core iron assembly 30 and the first core iron assembly 20, with both ends of the first spring 90 abutting against the second segment 72 and the first core iron assembly 20, respectively. The first spring 90 is driven to connect with the second core iron assembly 30 through the abutment member 70. The first spring 90 does not need to directly contact the second core iron assembly 30, which reduces the cross-sectional area of ​​the first spring 90 in the radial direction, thereby reducing the space volume of the first spring 90 in the valve cavity. This can improve the rationality of the internal component distribution of the solenoid valve and facilitate processing.

[0036] Specifically, as shown in Figure 3, the first stepped surface 502 and the second stepped surface 501 are sequentially arranged along the axial direction of the valve body assembly 10. The first stepped surface 502 abuts against the elastic member 60. When the solenoid valve is energized, the distance between the second stepped surface 501 and the abutting member 70 is L. When the solenoid valve opens, as the valve needle assembly 50 moves away from the first valve port 102, the valve needle assembly 50 may drop due to its own weight, causing the second stepped surface 501 to abut against the abutting member 70. In this case, the valve needle assembly 50 needs to increase its travel stroke to disengage from the piston assembly 40. This application, through the setting of the elastic member 60, can apply a driving force to the valve needle assembly 50 as it moves away from the first valve port 102, causing the valve needle assembly 50 to move relative to the second core iron assembly 30 away from the first valve port 102 until it is in contact with the second core iron assembly 30. This reduces the possibility that the second stepped surface 501 will abut against the abutting member 70, and avoids the first valve port 102 not being fully opened due to the lengthening of the valve needle assembly 50.

[0037] The solenoid valve further includes a valve seat 11 and a sleeve 12. A piston assembly is located within the valve seat 11. The valve seat 11 has a first valve port 102. One end of the valve seat 11 away from the first valve port 102 is connected to a first core iron assembly 20. The other end of the first core iron assembly 20 away from the first valve port 102 is connected to the sleeve 12. A second core iron assembly 30 is movably disposed within the sleeve 12. The valve seat 11, sleeve 12, and first core iron assembly 20 form a valve cavity 101.

[0038] As shown in Figure 2, the solenoid valve also includes a buffer element 80, which is located at the end of the second core iron assembly 30 away from the first valve port 102, and is directly opposite the sleeve 12. The buffer element 80 is used to abut against the sleeve 12, and can buffer the impact of the second core iron assembly 30 on the sleeve 12, so as to further reduce the noise generated by the collision between the second core iron assembly 30 and the sleeve 12 and improve the user experience.

[0039] Among them, the buffer 80 is made of rubber, which can reduce the impact of the buffer 80 on the sleeve 12.

[0040] The first core iron assembly 20 has a through hole 201 along the moving direction of the valve needle assembly 50. The valve needle assembly 50 passes through the through hole 201. One end of the first spring 90 is located inside the through hole 201 and abuts against the first core iron assembly 20. The other end of the first spring 90 abuts against the abutment member 70. The first spring 90 can provide a force to the second core iron assembly 30 away from the first core iron assembly 20. When the solenoid valve is energized, the second core iron assembly 30 moves closer to the first core iron assembly 20, and the first spring 90 is compressed. When the solenoid valve is de-energized, the second core iron assembly 30 loses the force of the coil assembly, releasing part of the pressure on the first spring 90. At this time, the first spring 90 is released, driving the second core iron assembly 30 to move away from the first core iron assembly 20 through the abutment member 70, thus driving the solenoid valve to open and increasing the smoothness of valve opening.

[0041] As shown in Figure 2, the piston assembly 40 includes a valve core 41 and a second spring 42. The valve core 41 is movably disposed at one end of the first core iron assembly 20 near the first valve port 102. The valve core 41 is correspondingly disposed to the first valve port 102. The second valve port 103 is located on the side of the valve core 41 away from the first valve port 102. The valve needle assembly 50 can block the second valve port 103 to drive the valve core 41 to close the first valve port 102. One end of the second spring 42 abuts against the valve core 41 to provide a force to the valve core 41 away from the first valve port 102.

[0042] As shown in Figure 2, the second core iron assembly 30 has a first balance channel 302. The two ends of the first balance channel 302 are connected to the top space of the sleeve 12 and the mounting cavity 301, respectively. When the valve needle assembly 50 moves upward relative to the second core iron assembly 30, the fluid between the valve needle assembly 50 and the second core iron assembly 30 can flow into the top of the sleeve 12 through the first balance channel 302, reducing the movement resistance of the valve needle assembly 50. The valve core 41 has a second balance channel 410 that penetrates the valve core 41. When the second valve port 103 opens, the second balance channel 410 quickly balances the pressure at both ends of the piston assembly 40, reducing the resistance when the valve core 41 moves and further improving the smoothness of the solenoid valve's opening.

[0043] Compared to existing AC power supplies, especially when there is a gap between the second core iron assembly 30 and the first core iron assembly 20, hysteresis and eddy current losses are more significant, leading to coil heating. In this application, the solenoid valve is powered by DC. The magnetic field generated by DC in the magnet is constant, eliminating hysteresis and eddy current losses, thus reducing coil heating. Particularly when there is a gap between the second core iron assembly 30 and the first core iron assembly 20 during energization, DC power significantly reduces the heat generated by the two core iron assemblies, extending the service life of the solenoid valve.

[0044] As shown in Figures 2 and 4, the inner wall of the through hole 201 is provided with a protruding structure 203; one end of the first spring 90 abuts against the protruding structure 203, and / or the protruding structure 203 is guided and engaged with the valve needle assembly 50.

[0045] In this embodiment, the protruding structure 203 abuts against one end of the first spring 90 and guides the valve needle assembly 50. The design of the protruding structure 203 abutting against one end of the first spring 90 ensures an appropriate length for the through hole 201 while providing extension and contraction space and stable support for the first spring 90. The protruding structure 203 has a certain length in the axial direction of the through hole 201. Through the guiding engagement of the protruding structure 203 with the valve needle assembly 50, the circumferential freedom of the valve needle assembly 50 can be restricted. This helps prevent the valve needle assembly 50 from shifting in the circumferential direction, thereby facilitating smooth movement of the valve needle assembly 50 and improving the smoothness and accuracy of its movement.

[0046] As shown in Figures 2 and 4, the end of the through hole 201 near the piston assembly 40 has a stepped structure 204, and the diameter of the stepped structure 204 gradually decreases towards the second core iron assembly 30.

[0047] In this embodiment, designing a stepped structure 204 on the through hole 201 eliminates unnecessary parts, reduces the overall weight of the solenoid valve, and improves its portability. Simultaneously, it reduces the space occupied by the through hole 201 within the solenoid valve, freeing up space for other structures, facilitating the assembly and further improvement of the solenoid valve. Furthermore, this design allows the valve needle assembly 50 to protrude more from the through hole 201, enabling better contact between the valve needle assembly 50 and the second valve port 103, thereby relatively reducing the overall length of the valve needle assembly 50.

[0048] As shown in Figures 1 and 4, the solenoid valve also includes a valve seat 11. A valve core 41 is movably disposed within the valve seat 11. The valve seat 11 has a first valve port 102. The end of the valve core 41 near the first core iron assembly 20 is sealed to the side wall of the valve seat 11, dividing it into a first flow chamber 111 and a second flow chamber 112. The first flow chamber 111 is located on the side of the valve core near the first core iron assembly 20. A third balancing channel 420 is also provided on the valve core 41. The third balancing channel 420 is eccentrically positioned and communicates with both the first flow chamber 111 and the second flow chamber 112. By providing the third balancing channel 420 on the valve core 41, the pressure difference between the first flow chamber 111 and the second flow chamber 112 can be balanced, allowing the valve core 41 to move more smoothly within the valve seat 11.

[0049] The through hole 201 includes a first hole segment and a second hole segment. The protrusion structure 203 is located between the first hole segment and the second hole segment. The side wall of the valve needle assembly 50 is provided with a notch 51. The notch 51 extends along the extension direction of the valve needle assembly 50. The notch 51 is provided corresponding to the protrusion structure 203. The notch 51 connects the first hole segment and the second hole segment.

[0050] The protrusion 203 provided between the first and second orifice sections can cooperate with the notch 51 provided in the valve needle assembly 50. On the one hand, the protrusion 203 can guide the valve needle assembly 50, improving the smoothness and accuracy of the valve needle assembly 50's movement. On the other hand, the presence of the notch 51 can connect the first and second orifice sections, balance the pressure difference between the first and second orifice sections, and enable the valve needle assembly 50 to move smoothly within the through hole 201.

[0051] As shown in Figures 2 and 4, the end of the valve core 41 near the first valve port 102 has a mounting groove. The piston assembly 40 also includes a seal 43, which is disposed in the mounting groove and is used to fit and seal with the first valve port 102. The side wall of the valve core 41 is provided with a connecting hole 411, which communicates with the mounting groove.

[0052] In this embodiment, the mounting groove provides installation space for the seal 43, allowing it to better fit against the first valve port 102 when sealing it, thus improving sealing performance. A connecting hole 411 is also provided on the side wall of the valve core 41, communicating with the mounting groove. This design takes into account that the seal 43 may deform under pressure, and the connecting hole 411 provides space for this deformation, releasing some of the compressive stress. This prevents the compressive stress from continuously acting inside the seal 43, which could lead to premature wear and failure, thereby extending the service life of the seal 43 and improving the sealing performance of the solenoid valve.

[0053] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A solenoid valve, characterized in that, The solenoid valve includes: The valve body assembly (10) has a valve cavity (101) and a first valve port (102), wherein the first valve port (102) is disposed at one end of the valve cavity (101) and communicates with the valve cavity (101); The first core iron assembly (20) is fixedly connected to the valve body assembly (10); The second core iron assembly (30) is movably disposed within the valve chamber (101); A piston assembly (40) is movably disposed within the valve chamber (101) and located on the side of the first core iron assembly (20) away from the second core iron assembly (30), the piston assembly (40) having a second valve port (103); A valve needle assembly (50) is movably disposed within the valve cavity (101) and connected to the second core iron assembly (30); When the solenoid valve is energized, the first core iron assembly (20) and the second core iron assembly (30) attract each other; one end of the valve needle assembly (50) closes the second valve port (103), and the other end of the valve needle assembly (50) abuts against the second core iron assembly (30); the piston assembly (40) closes the first valve port (102); and there is a gap H between the second core iron assembly (30) and the first core iron assembly (20).

2. The solenoid valve according to claim 1, characterized in that, The second core iron assembly (30) has an abutment (70) at its end facing the first core iron assembly (20). The abutment (70) and the second core iron assembly (30) form a mounting cavity (301). One end of the valve needle assembly (50) is located in the mounting cavity (301), and the other end of the valve needle assembly (50) extends out of the mounting cavity (301) and seals with the second valve port (103). The mounting cavity (301) has an elastic element (60) located between the valve needle assembly (50) and the abutment (70). The elastic element (60) provides the valve needle assembly (50) with a force to move away from the second valve port (103).

3. The solenoid valve according to claim 2, characterized in that, One end of the valve needle assembly (50) has a first stepped surface (502), and the elastic member (60) extending along the axial direction of the solenoid valve is sandwiched between the first stepped surface (502) and the abutment member (70).

4. The solenoid valve according to claim 3, characterized in that, The valve needle assembly (50) also has a second stepped surface (501) located between the first stepped surface (502) and the abutment (70); when the solenoid valve is in the energized state, the distance between the second stepped surface (501) and the abutment (70) is L.

5. The solenoid valve according to claim 2, characterized in that, The mounting cavity (301) includes a first inner wall opposite to the abutment (70), and one end of the valve needle assembly (50) is confined between the first inner wall and the abutment (70).

6. The solenoid valve according to claim 2, characterized in that, The first core iron assembly (20) has a receiving cavity (202) at one end near the second core iron assembly (30), and the receiving cavity (202) is correspondingly arranged with the abutment (70); when the solenoid valve is in the energized state, the abutment (70) is located in the receiving cavity (202), and the abutment (70) is in contact with the inner wall of the receiving cavity (202); or, there is a gap between the abutment (70) and the inner wall of the receiving cavity (202).

7. The solenoid valve according to claim 6, characterized in that, The abutment member (70) includes a first segment (71) and a second segment (72) arranged in sequence. The first segment (71) is located inside the mounting cavity (301), and the second segment (72) is located outside the mounting cavity (301). The outer diameter of the second segment (72) is larger than the outer diameter of the first segment (71). The second segment (72) is in contact with the end face of the second core iron assembly (30) relative to the end face of the first core iron assembly (20).

8. The solenoid valve according to claim 1, characterized in that, The solenoid valve further includes a buffer (80), which is disposed at the end of the second core iron assembly (30) away from the first valve port (102); the valve body assembly (10) further includes a sleeve (12), the second core iron assembly (30) is located inside the sleeve (12), and the buffer (80) is directly opposite the sleeve (12).

9. The solenoid valve according to claim 2, characterized in that, The first core iron assembly (20) has a through hole (201) along the moving direction of the valve needle assembly (50), the valve needle assembly (50) passes through the through hole (201), the solenoid valve further includes a first spring (90), one end of the first spring (90) is located in the through hole (201) and abuts against the first core iron assembly (20), the other end of the first spring (90) abuts against the abutting member (70), and the first spring (90) can provide a force to the second core iron assembly (30) away from the first core iron assembly (20).

10. The solenoid valve according to claim 9, characterized in that, The inner wall of the through hole (201) is provided with a protruding structure (203); one end of the first spring (90) abuts against the protruding structure (203), and / or the protruding structure (203) is guided and engaged with the valve needle assembly (50).

11. The solenoid valve according to claim 10, characterized in that, The piston assembly (40) includes a valve core (41) and a second spring (42). The valve core (41) is movably disposed at one end of the first core iron assembly (20) near the first valve port (102). The valve core (41) is correspondingly disposed with respect to the first valve port (102). The second valve port (103) is located on the side of the valve core (41) away from the first valve port (102). The valve needle assembly (50) can block the second valve port (103) to drive the valve core (41) to close the first valve port (102). One end of the second spring (42) abuts against the valve core (41). The bottom of the valve body assembly (10) is provided with a groove, and the other end of the second spring (42) is located in the groove.

12. The solenoid valve according to claim 9, characterized in that, The through hole (201) has a stepped structure (204) at one end near the piston assembly (40), and the diameter of the stepped structure (204) gradually decreases toward the second core iron assembly (30).

13. The solenoid valve according to claim 11, characterized in that, The solenoid valve further includes a valve seat (11), and the valve core (41) is movably disposed in the valve seat (11). The valve seat (11) has the first valve port (102). One end of the valve core (41) near the first core iron assembly (20) is sealed to the side wall of the valve seat (11) to divide it into a first flow chamber (111) and a second flow chamber (112). The first flow chamber (111) is located on the side of the valve core (41) near the first core iron assembly (20). The valve core (41) is also provided with a third balance channel (420). The third balance channel (420) is eccentrically disposed and communicates with the first flow chamber (111) and the second flow chamber (112) respectively. The through hole (201) includes a first hole segment and a second hole segment. The protrusion structure (203) is located between the first hole segment and the second hole segment. The side wall of the valve needle assembly (50) is provided with a notch (51). The notch (51) extends along the extension direction of the valve needle assembly (50). The notch (51) is provided corresponding to the protrusion structure (203). The notch (51) connects the first hole segment and the second hole segment.

14. The solenoid valve according to claim 11, characterized in that, The valve core (41) has a mounting groove at the end near the first valve port (102). The piston assembly also includes a seal (43), which is disposed in the mounting groove and is used to fit and seal with the first valve port (102). The side wall of the valve core (41) is provided with a connecting hole (411), which communicates with the mounting groove.

15. The solenoid valve according to claim 1, characterized in that, The solenoid valve is powered by direct current.

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