Electromagnetic valve

Abstract

The utility model provides an electromagnetic valve, which belongs to the technical field of thermal management and comprises a first magnetizer, a movable iron core and a sleeve. At least part of the movable iron core is located in the sleeve, and the first magnetizer abuts against or is fixedly connected with the sleeve. The first magnetizer is adjacent to the movable iron core in the radial direction of the sleeve. The air gap between the first magnetizer and the movable iron core is reduced, so that the magnetic field intensity borne by the movable iron core is improved.

Description

Technical Field

[0001] This utility model relates to the field of thermal management technology, and in particular to a solenoid valve for automotive or energy storage applications. Background Technology

[0002] The main components of a solenoid valve are a coil, an actuator, and a sleeve. The coil generates magnetism when energized, and the sleeve is located inside the coil. The actuator is also located inside the coil, and the sleeve prevents fluid from entering the coil, thus protecting it. The actuator consists of a stationary iron core and a moving iron core. Under the influence of a magnetic field, both iron cores are magnetized, and the moving iron core attracts the stationary iron core. To increase the magnetic flux of the iron core, the solenoid valve also has a magnetic conductor. The sleeve is located between the magnetic conductor and the moving iron core. The relatively large gap between the magnetic conductor and the iron core results in a significant loss of electromagnetic force. Utility Model Content

[0003] The purpose of this invention is to provide an electromagnetic valve that helps to reduce the air gap, lower the magnetic resistance, and increase the magnetic field strength on the iron core.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This utility model provides an electromagnetic valve, comprising a first magnetic conductor, a moving iron core, and a sleeve; at least a portion of the moving iron core is located inside the sleeve, and the first magnetic conductor and the sleeve are abutted or fixedly connected; along the radial direction of the sleeve, the first magnetic conductor and the moving iron core are arranged adjacent to each other.

[0006] The electromagnetic valve provided by this utility model has the following beneficial effects: Since the first magnetic conductor is arranged adjacent to the moving iron core, that is, there is no structure between the moving iron core and the first magnetic conductor that blocks the magnetic transmission between the moving iron core and the first magnetic conductor, compared with the structure in the prior art where the sleeve is located between the moving iron core and the magnetic conductor, this utility model reduces the air gap between the first magnetic conductor and the moving iron core, thereby reducing the magnetic loss conducted from the first magnetic conductor to the moving iron core. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0008] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the solenoid valve provided by this utility model;

[0009] Figure 2This is a front-view perspective three-dimensional structural diagram of an embodiment of the solenoid valve provided by this utility model;

[0010] Figure 3 yes Figure 1 The diagram shows an exploded view of the three-dimensional structure of a solenoid valve.

[0011] Figure 4 yes Figure 2 A cross-sectional view of the internal structure of a solenoid valve shown along the AA direction;

[0012] Figure 5 yes Figure 4 The enlarged structural schematic diagram of partial view B shown in the figure;

[0013] Figure 6 yes Figure 2 A schematic diagram of another embodiment of a solenoid valve is shown along the AA direction.

[0014] Figure 7 yes Figure 1 The diagram shows a magnetic circuit diagram of a solenoid valve.

[0015] Figure 8 yes Figure 1 The diagram shows a fluid flow path of a solenoid valve.

[0016] 1. Coil assembly; 2. First magnetic conductor; 21. Magnetic transmission part; 211. First wall surface; 22. Magnetic conductor; 221. Second wall surface; 23. Second body; 3. Second magnetic conductor; 31. First wall; 32. Second wall; 33. Third wall; 34. First mounting hole; 35. Second mounting hole; 36. Mounting cavity; 4. Moving iron core; 41. First shaft section; 411. Spring receiving cavity; 42. Second shaft section; 43. First channel; 44. Second channel; 45. Third channel; 46. Conical part; 5. Stationary iron core; 6. Sleeve; 7. Valve seat; 71. Protrusion; 711. Iron core receiving cavity; 72. First body; 73. Piston mounting cavity; 74. Sealing block; 741. Flow channel hole; 75. Piston; 751. Air pressure balance hole; 8. Housing; 9. Iron core spring; L1. First gap; L2. Second gap; P1. Inlet; P2. Valve port; P3. Outlet. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it.

[0018] A typical solenoid valve consists of a moving iron core, a stationary iron core, windings, and a magnetic conductor. When the windings are energized, they generate a magnetic field. The magnetic conductor guides this magnetic field to the moving iron core. This arrangement helps concentrate the magnetic field on the moving iron core, thereby improving the solenoid valve's driving capability. A gap, also known as an air gap, exists between the moving iron core and the magnetic conductor. This air gap is located radially outside the moving iron core and is necessary for the moving iron core to move relative to components such as the stationary iron core. However, an excessively large air gap can exacerbate magnetic leakage, thus reducing the solenoid valve's driving capability. Furthermore, solenoid valves typically have sleeves fitted around the moving and stationary iron cores to provide good pressure resistance and burst resistance. However, the sleeves between the moving iron core and the magnetic conductor increase the magnetic resistance between them, further reducing the solenoid valve's driving capability. Furthermore, due to the inherent bias problem during the assembly process of the iron core, the gap between the iron core and the cavity wall accommodating it is not uniform. Specifically, when the magnetic conductor and the moving iron core are close together, the gap between them is smaller. This smaller gap results in a stronger magnetic field transmitted from the magnetic conductor to the moving iron core, leading to a greater magnetic force on the moving iron core. This magnetic force includes both axial and radial forces on the moving iron core. The increase in radial force makes the moving iron core more prone to bias. In practical applications, the moving iron core is located within the valve seat, and its circumferential gap with the valve seat is not uniform, already indicating bias. If the gap between the magnetic conductor and the moving iron core is smaller, the magnetic loss transmitted from the magnetic conductor to the moving iron core is smaller. This increases the electromagnetic force exerted by the magnetic conductor on the moving iron core, increasing the radial resultant force causing bias in the moving iron core. Consequently, this increases the friction between the moving iron core and the valve seat, potentially leading to a situation where the valve cannot be opened.

[0019] like Figure 2 and Figure 3 As shown, this utility model provides an electromagnetic valve, which includes a coil assembly 1 and a magnetic conductor. The magnetic conductor includes a first magnetic conductor 2 and a second magnetic conductor 3. The coil assembly 1 and the magnetic conductor respectively function to generate magnetism when energized and to conduct magnetism. The second magnetic conductor 3 can conduct the magnetic field to the first magnetic conductor 1. The electromagnetic valve also includes an iron core and a sleeve 6. The sleeve 6 is fitted outside the iron core. The iron core includes a moving iron core 4 and a stationary iron core 5. The iron core is the actuator. The coil assembly 1 generates magnetism when energized and forms a complete magnetic circuit through the first magnetic conductor 2 and the second magnetic conductor 3. The iron cores attract each other under the action of the magnetic field, causing the moving iron core 4 to move relative to the stationary iron core 5 along the axial direction of the sleeve 6. Figure 6 As shown, path P illustrates a portion of the magnetic field circuit. This magnetic path, along the direction of the arrow, passes through the stationary iron core 5, the second magnetic conductor 3, the first magnetic conductor 2, and the radial gap between the first magnetic conductor 2 and the moving iron core 4, forming a closed path. In some other embodiments, the solenoid valve also includes a valve seat 7, a sealing block 74, and a piston 75. The piston 75 is sleeved outside the sealing block 74, and the sealing block 74 abuts against the moving iron core 4. Figure 7As shown, the solenoid valve can control the opening and closing of the valve port P2, thereby controlling the connection or blockage of the flow channel. When the coil assembly 1 is not energized, part of the moving iron core 4 abuts against the sealing block 74 inside the valve seat 7. The sealing block 74 abuts against the valve port P2, causing the flow channel to be blocked. When the coil assembly 1 is energized, the stationary iron core 5 and the moving iron core 4 are magnetized and attracted, causing the moving iron core 4 to move away from the valve seat 7. The moving iron core 4 separates from the sealing block 74, and the sealing block 74 separates from the valve port P2, thereby connecting the inlet P1 and the outlet P2.

[0020] To reduce the magnetic loss of the solenoid valve, the solenoid valve includes a first magnetic conductor 2, a moving iron core 4, and a sleeve 6. At least a portion of the moving iron core 4 is located inside the sleeve 6. The first magnetic conductor 2 and the sleeve 6 are abutted or fixedly connected. Along the radial direction of the sleeve 6, the first magnetic conductor 2 and the moving iron core 4 are arranged facing each other.

[0021] like Figures 2 to 4 As shown, the first magnetic conductor 2 serves as a magnetic medium, reducing magnetic leakage in the magnetic circuit and improving the magnetic induction intensity of the moving iron core 4 and the stationary iron core 5. The first magnetic conductor 2 can be approximately annular and made of a magnetically conductive material, such as magnetizable stainless steel. In the radial direction of the moving iron core 4, the first magnetic conductor 2 and the sleeve 6 are located outside the moving iron core 4, facing each other. Facing each other means that the first magnetic conductor 2 and the moving iron core 4 are adjacent to each other without any obstruction from any component. This arrangement helps reduce the air gap between the first magnetic conductor 2 and the moving iron core 4, thereby reducing magnetic loss. In one embodiment, along the radial direction of the sleeve 6, a portion of the first magnetic conductor 2 is located between the moving iron core 4 and the sleeve 6, and the first magnetic conductor 2 and the moving iron core 4 are adjacent to each other. Optionally, a first gap L1 exists between them, where the radial dimension of the first gap L1 can be smaller than the radial thickness of the sleeve 6. Optionally, the first magnetic conductor 2 may not be located between the moving iron core 4 and the sleeve 6. The above arrangement ensures that no component is located between the first magnetic conductor 2 and the moving iron core 4, and allows the first magnetic conductor 2 and the moving iron core 4 to maintain a closer distance, reducing the gap between them and thus reducing the magnetic loss of the solenoid valve. In the axial direction of the moving iron core 4, the sleeve 6 is abutted against or fixedly connected to the first magnetic conductor 2, such as by welding or riveting. By reducing the air gap between the first magnetic conductor 2 and the moving iron core 4, the magnetic loss between them is reduced, resulting in a stronger magnetic field on the moving iron core 4. Compared to the scheme where the sleeve 6 is located between the first magnetic conductor 2 and the moving iron core 4, this embodiment has lower magnetic loss, allowing the moving iron core 4 to experience the same magnetic field strength while reducing the magnetic induction intensity. This reduces the number of coil turns and coil weight, achieving a lightweight solenoid valve.

[0022] In one embodiment, the second magnetic conductor 3 has a first wall 31 and a mounting cavity 36. The first wall 31 defines a portion of the wall of the mounting cavity 36. The coil assembly 1 is located inside the mounting cavity 36. Along the radial direction of the moving iron core 4, the first wall 31 is located outside the first magnetic conductor 2, and the first wall 31 abuts or gap-fits with the first magnetic conductor 2.

[0023] like Figure 2 As shown, the second magnetic conductor 3 serves two purposes: firstly, it acts as a magnetic medium to reduce magnetic leakage in the magnetic circuit; secondly, it functions as the housing of the solenoid valve, accommodating and protecting components such as the moving iron core 4 and the coil assembly 1. The second magnetic conductor 3 has a first wall 31, a second wall 32, and a third wall 33 arranged along the axial direction of the moving iron core 4. The first wall 31 and the third wall 33 are parallel. The first wall 31 is located at the end of the second wall 32 furthest from the third wall 33, and the third wall 33 is located at the end of the second wall 32 furthest from the first wall 31. The second wall 32 is located between the first wall 31 and the third wall 33, connecting them to form a magnetic circuit. There is a gap between the first wall 31 and the third wall 33. The first wall 31 abuts against or is in clearance fit with the first magnetic conductor 2, and the third wall 33 abuts against the coil assembly 1 and the stationary iron core 5.

[0024] Specifically, the second magnetic conductor 3 has a mounting cavity 36, a first mounting hole 34, and a second mounting hole 35. The space defined by the first wall 31, the second wall 32, and the third wall 33 forms the mounting cavity 36. The coil assembly 1 is located inside the mounting cavity 36. In the radial direction of the sleeve 6, the coil assembly 1 is located outside the sleeve 6. One end of the coil assembly 1 abuts against the end of the first wall 31 facing the third wall 33, and the other end of the coil assembly 1 abuts against the end of the third wall 33 facing the first wall 31. The first wall 31 has the first mounting hole 34, and the third wall 33 has the second mounting hole 35. The axis of the first mounting hole 34 coincides with the axis of the second mounting hole 35. The stationary iron core 5 is connected to the second mounting hole 35. The three walls 33 and 5 are on the same axis. The third wall 33 abuts against the end of the stationary iron core 5 away from the moving iron core 4. The end face of the stationary iron core 5 away from the moving iron core 4 has a threaded hole coaxial with the second mounting hole 35. The bolts fix the third wall 33 and the stationary iron core 5 through the second mounting hole 35. The wall of the first mounting hole 34 extends radially towards the moving iron core 4, which can accommodate part of the moving iron core 4 and the first magnetic conductor 2 within the first mounting hole 34. The first wall 31 abuts or gap-fits the wall of the first mounting hole 34 with the first magnetic conductor 2, which can reduce the distance between the first magnetic conductor 2 and the second magnetic conductor 3, thereby reducing the magnetic leakage between the first magnetic conductor 2 and the second magnetic conductor 3. Through the above arrangement, the solenoid valve can form a complete magnetic circuit when the coil assembly 1 is energized.

[0025] In one embodiment, the moving iron core 4 includes a first shaft segment 41, and the sleeve 6 is clearance-fitted with the first shaft segment 41. The first magnetic conductor 2 includes a magnetic transmission part 21 and a magnetic conduction part 22. Along the axial direction of the moving iron core 4, the magnetic transmission part 21 is located on the side of the magnetic conduction part 22 close to the first wall 31. The magnetic transmission part 21 abuts against or is clearance-fitted with the first wall 31. The magnetic conduction part 22 is located between the sleeve 6 and the moving iron core 4, and there is a first gap L1 between the magnetic conduction part 22 and the moving iron core 4.

[0026] like Figure 2 and Figure 3 As shown, the sleeve 6 is sleeved on the outside of the moving iron core 4 and the stationary iron core 5. Along the axial direction of the moving iron core 4, the stationary iron core 5 is located on the side of the moving iron core 4 near the third wall 33. The first shaft section 41 is set at the end of the moving iron core 4 near the stationary iron core 5. The sleeve 6 and the first shaft section 41 are clearance-fitted, so that the first shaft section 41 can move relative to the sleeve 6, and the sleeve 6 can limit the moving iron core 4. Therefore, the sleeve 6 can reduce the offset of the moving iron core 4 towards the non-axial direction.

[0027] like Figure 3 and Figure 4 As shown, the magnetic transmission part 21 and the magnetic guiding part 22 are distributed along the axial direction of the moving iron core 4. The magnetic guiding part 22 extends towards the stationary iron core 5, which is beneficial for the sleeve 6 to limit the magnetic guiding part 22. Along the radial direction of the moving iron core 4, the magnetic transmission part 21 is located outside the magnetic guiding part 22, and the magnetic guiding part 22 is close to the side of the first wall 31. Specifically, the magnetic transmission part 21 is located in the first mounting hole 34 and is clearance-fitted or abutting against the first wall 31. The magnetic transmission part 21 has a first wall surface 211, which is formed between the outer diameter of the magnetic guiding part 22 and the outer diameter of the magnetic transmission part 21. The first wall surface 211 is located at the end of the magnetic transmission part 21 near the sleeve 6, so that the first wall surface 211 is fixedly connected to the end face of the sleeve 6 away from the stationary iron core 5, for example by welding. Welding can reduce the probability of refrigerant leakage and meet the product's pressure burst resistance performance.

[0028] The magnetic conductive part 22 is located between the moving iron core 4 and the sleeve 6, and the circumferential surface of the magnetic conductive part 22 away from the moving iron core 4 abuts against the circumferential surface of the sleeve 6 near the moving iron core 4, so that the magnetic conductive part 22 can limit the sleeve 6. At the same time, there is a first gap L1 between the magnetic conductive part 22 and the moving iron core 4, so that the moving iron core 4 can move relative to the magnetic conductive part 22.

[0029] In one embodiment, the moving iron core 4 further includes a second shaft segment 42, and the solenoid valve further includes a valve seat 7. The valve seat 7 includes a protrusion 71 and a first body 72. The valve seat 7 also includes an iron core receiving cavity 711. The protrusion 71 defines the wall of the iron core receiving cavity 711. The protrusion 71 and the first body 72 are arranged side by side along the axial direction of the valve seat 7. The first body 72 abuts against the magnetic transmission part 21. Along the radial direction of the moving iron core 4, the protrusion 71 is located inside the magnetic transmission part 21, and the protrusion 71 is clearance-fitted with the second shaft segment 42. Along the axial direction of the moving iron core 4, the protrusion 71 abuts against the magnetic conduction part 22. There is a second gap L2 between the protrusion 71 and the second shaft segment 42, and the first gap L1 is greater than or equal to the second gap L2.

[0030] like Figure 2 and Figure 3 As shown, the second shaft segment 42 and the first shaft segment 41 are integrally formed and have the same axis. The second shaft segment 42 and the first shaft segment 41 are distributed along the axial direction of the sleeve 6, and the second shaft segment 42 is at least partially located inside the sleeve 6. The second shaft segment 42 is located on the side of the first shaft segment 41 away from the stationary iron core 5, and the diameter of the second shaft segment 42 is smaller than the diameter of the first shaft segment 41. Therefore, it can reduce the contact area between the moving iron core 4 and the sleeve 6, increase the space between them, and thus reduce the friction between them.

[0031] The first shaft section 41 and the sleeve 6 are fitted with a clearance fit. On the one hand, the clearance fit is conducive to the axial movement of the moving iron core 4, and on the other hand, it can limit the movement of the moving iron core 4 from the direction of the axis of the moving iron core 4, thus playing a limiting role. Furthermore, the protrusion 71 is fitted with the second shaft section 42 with a clearance fit. Therefore, the protrusion 71 and the sleeve 6 together limit the moving iron core 4.

[0032] The outer peripheral wall of the second shaft segment 42 is evenly distributed. This arrangement ensures that when the second shaft segment 42 moves, the gap difference between the first magnetic conductor 2 and the second shaft segment 42 changes little as the second shaft segment 42 moves. Because the difference is small, the radial force exerted by the first magnetic conductor 2 on the second shaft segment 42 changes little, making the radial force on the second shaft segment 42 more balanced.

[0033] Furthermore, the difference in radius between the second shaft segment 42 and the first shaft segment 41 is greater than the radial width of the magnetically conductive part 22 located between the moving iron core 4 and the sleeve 6, thereby preventing the magnetically conductive part 22 from contacting the second shaft segment 42 or preventing the sleeve 6 from being unable to limit the first shaft segment 41.

[0034] like Figure 4As shown, along the radial direction of the moving iron core 4, the inner diameter of the magnetic transmission part 21 is larger than the inner diameter of the magnetic conduction part 22. The first magnetic conductor 2 forms a second wall surface 221 between the inner diameter of the magnetic transmission part 21 and the inner diameter of the magnetic conduction part 22. The second wall surface 221 is located at one end face of the magnetic conduction part 22 near the valve seat 7, and the second wall surface 221 abuts against the protrusion 71. The radial length of the second wall surface 221 is less than the radial length of the protrusion 71, thus making the protrusion 71 closer to the moving iron core 4 than the magnetic conduction part 22.

[0035] In one embodiment, the first gap L1 is equal to the second gap L2. Along the axial direction of the moving iron core 4, the valve seat 7 is located at the end of the first magnetic conductor 2 away from the sleeve 6. Along the axial direction of the valve seat 7, the first body 72 and the protrusion 71 are arranged side by side. The protrusion 71 extends axially towards the moving iron core 4, and a portion of the protrusion 71 is located within the first mounting hole 34. The protrusion 71 is located between the moving iron core 4 and the magnetic transmission part 21. The protrusion 71 has a hollow structure to form an iron core receiving cavity 711. A portion of the second shaft segment 42 is located within the iron core receiving cavity 711 and is clearance-fitted with the protrusion 71. Therefore, the protrusion 71 and the magnetic transmission part 22 can limit the movement of the moving iron core 4, reduce the offset of the moving iron core 4, and allow the moving iron core 4 to move relative to the protrusion 71 and the magnetic transmission part 22.

[0036] The valve seat 7 and the sleeve 6 work together to limit the movement of the moving iron core 4, thereby reducing its bias. Even when the moving iron core 4 reaches its maximum bias, it remains relatively centered relative to the first magnetic conductor 2. This results in a more uniform distribution of the radial electromagnetic force on the moving iron core 4, reducing the bias force and thus lowering its bias. Because the bias of the moving iron core 4 is reduced, the friction between the second shaft section 42 of the moving iron core 4 and the protrusion 71 of the valve seat 7 is also reduced. This helps to solve the problem of difficulty in opening the valve caused by high friction between the moving iron core 4 and the valve seat 7.

[0037] like Figure 4 As shown, to further reduce the bias force on the second shaft segment 42, in one embodiment, the first gap L1 is larger than the second gap L2, that is, the radial distance between the magnetically conductive part 22 and the second shaft segment 42 is greater than the radial distance between the protrusion 71 and the second shaft segment 42. Based on the first gap L1, increasing the radial distance between the magnetically conductive part 22 and the second shaft segment 42 helps to reduce the large radial electromagnetic force generated by the first magnetically conductive body 2 on the second shaft segment 42, which helps to reduce the radial bias force on the moving iron core 4, thereby reducing the friction between the moving iron core 4 and the protrusion 71. At the same time, using a smaller second gap L2, the protrusion 71 can still brake the bias of the iron core 4 at the upper limit of the structure. Therefore, by setting different gaps L1 and L2, the bias force on the moving iron core 4 is reduced.

[0038] In one embodiment, the moving iron core 4 further includes a second shaft segment 42, the first magnetic conductor 2 has an iron core receiving cavity 711, the magnetic conductor 22 defines a portion of the wall of the iron core receiving cavity 711, and the magnetic conductor 22 is clearance-fitted with the second shaft segment 42.

[0039] like Figure 5 As shown, a portion of the second shaft segment 42 is located within the core receiving cavity 711 formed by the magnetically conductive part 22, and is in clearance fit with the magnetically conductive part 22. This allows the moving core 4 to move axially relative to the first magnetically conductive body 2, and the first magnetically conductive body 2 can also limit the movement of the moving core 4 to reduce its bias. Along the radial direction of the moving core 4, the first magnetically conductive body 2, the sleeve 6, and the second magnetically conductive body 3 are distributed. The first magnetically conductive body 2 and the second magnetically conductive body 3 abut against each other or form a small clearance fit, resulting in a small distance between them, which can reduce magnetic loss between them.

[0040] In one embodiment, the valve seat 7 further has a piston mounting cavity 73, the first body 72 defines the wall of the piston mounting cavity 73, and the solenoid valve further includes a piston 75 and a sealing block 74 located in the piston mounting cavity 73, the outer peripheral surface of the sealing block 74 is sealed to the inner peripheral surface of the piston 75, and the outer peripheral surface of the piston 75 is slidably connected to the first body 72.

[0041] like Figure 3 As shown, the valve seat 7 also includes a piston mounting cavity 73 for accommodating the piston 75 and the sealing block 74. The inner peripheral surface of the piston 75 is sealed to the outer peripheral surface of the sealing block 74. The outer peripheral surface of the piston 75 abuts against the wall forming the piston mounting cavity 73 and is slidably disposed therein.

[0042] Similarly, such as Figure 5 As shown, the first magnetic conductor 2 also includes a second body 23. The first magnetic conductor 2 also has a piston mounting cavity 73. The second body 23 defines the wall of the piston mounting cavity 73. The magnetic transmission part 21, the magnetic conductor 22 and the second body 23 are arranged side by side along the axial direction of the first magnetic conductor 2. The solenoid valve also includes a piston 75 and a sealing block 74 located in the piston mounting cavity 73. The outer peripheral surface of the sealing block 74 is sealed to the inner peripheral surface of the piston 75. The outer peripheral surface of the piston 75 is slidably connected to the second body 23.

[0043] In practical use, the solenoid valve is used to control the opening and closing of the fluid flow path. With the above settings, when the coil assembly 1 is energized, the fluid flow path enters the connected state, the moving iron core 4 moves toward the direction closer to the stationary iron core 5, and the piston 75 and the sealing block 74 move toward the direction closer to the moving iron core 4 under the action of fluid pressure; when the coil assembly 1 is de-energized, the fluid flow path enters the blocked state, the moving iron core 4 moves away from the stationary iron core 5, and the moving iron core 4 pushes the sealing block 74 and drives the piston 75 to move, thereby blocking the fluid flow path.

[0044] The sealing block 74 has a flow channel hole 741, which is a stepped hole. The end of the flow channel hole 741 with a smaller diameter is sealed to the moving iron core 4. The moving iron core 4 can control the opening and closing of the flow channel hole 741. Specifically, the axis of the flow channel hole 741 coincides with the axis of the moving iron core 4. The end face of the moving iron core 4 near the piston 75 has a tapered portion 46. The diameter of the tapered portion 46 near the moving iron core 4 is larger than the diameter of the end of the tapered portion 46 away from the moving iron core 4, and the diameter of the end of the tapered portion 46 away from the moving iron core 4 is smaller than the diameter of the end of the flow channel hole 741 near the tapered portion 741. The diameter of one end of part 46; the piston 75 extends axially along the piston mounting cavity 73, at least part of the piston 75 is located in the piston mounting cavity 73, the moving iron core 4 is located on the side of the flow channel hole 741 axially close to the stationary iron core 5. In actual use, when the moving iron core 4 slides relative to the sleeve 6, the moving iron core 4 can open or close the flow channel hole 741 and can control the degree of opening of the flow channel hole 741, thereby forming a pressure difference between the two ends of the piston 75, thereby controlling the movement of the piston 75 relative to the first body 72 or the second body 23.

[0045] The piston 75 also includes a pressure balance hole 751, which is located between the wall surface where the piston 75 abuts with the first body 72 or the second body 23 and the wall surface where the piston 75 abuts with the sealing block 74. The axis of the pressure balance hole 751 is parallel to the axis of the piston 75, and the pressure balance hole 751 connects the piston mounting cavities 73 at both ends of the piston 75 in the axial direction.

[0046] By setting the air pressure balance hole 751, the spaces at both ends of the piston 75 can be connected. When the solenoid valve is in the closed state, the sealing block 74 abuts against the valve port, and fluid enters the end of the piston 75 near the moving iron core 4 through the air pressure balance hole 751, allowing the sealing block 74 to further abut against the valve port under air pressure. Furthermore, when the moving iron core 4 and the stationary iron core 5 begin to engage, releasing the seal between the moving iron core 4 and the sealing block 74, the gas on the side of the piston 75 away from the moving iron core 4 will move rapidly towards the moving iron core 4 under pressure through the air pressure balance hole 751, generating an impact on the moving iron core 4, accelerating the engagement of the moving iron core 4 and the stationary iron core 5, and further improving the response speed of the moving iron core 4.

[0047] In one embodiment, the solenoid valve further includes a housing 8, a coil assembly 1, a second magnetic conductor 3, a stationary iron core 5, and an iron core spring 9. The housing 8 is fixedly connected to the outside of the coil assembly 1 and is located within the accommodating space defined by the second magnetic conductor 3, and is fixedly connected to the second magnetic conductor 3. The sleeve 6 is located inside the coil assembly 1, and the stationary iron core 5 is located inside the sleeve 6 and is limitedly connected to the sleeve 6. The stationary iron core 5 is fixedly connected to the second magnetic conductor 3. One end of the iron core spring 9 abuts against the stationary iron core 5, and the other end abuts against the moving iron core 4.

[0048] like Figure 1 and Figure 3As shown, the solenoid valve also includes a housing 8, which is injection molded with the coil assembly 1 as an insert. The housing 8 is located within the accommodating space defined by the wall of the second magnetic conductor 3, and the two are fixedly connected. A core spring 9 is provided between the stationary iron core 5 and the moving iron core 4; a stroke air gap is reserved between the moving iron core 4 and the stationary iron core 5; the sleeve 6 is interference-fitted with the stationary iron core 5, so that when the coil assembly 1 is energized, the moving iron core 4 moves toward the stationary iron core 5, while the stationary iron core 5 remains stationary. When the moving iron core 4 and the stationary iron core 5 are attracted, the moving iron core 4 moves toward the direction closer to the stationary iron core 5. During the attraction process, the end of the moving iron core 4 near the stationary iron core 5 squeezes the core spring 9, causing the core spring 9 to accumulate elastic potential energy. When the coil assembly 1 is de-energized and the magnetism of the moving iron core 4 and the stationary iron core 5 disappears, the elastic potential energy accumulated by the core spring 9 is released, causing the moving iron core 4 to be pushed away from the stationary iron core 5 by the core spring 9, thereby realizing the function of automatic reset.

[0049] Specifically, the moving iron core 4 also includes a spring receiving cavity 411. The spring receiving cavity 411 is coaxial with the moving iron core 4 and located at one end face of the moving iron core 4 near the stationary iron core 5, and is recessed along the axial direction away from the stationary iron core 5. The diameter of the spring receiving cavity 411 is larger than the diameter of the iron core spring 9. The iron core spring 9 is at least partially built into the spring receiving cavity 411. One end of the iron core spring 9 abuts against the bottom of the spring receiving cavity 411, and the other end abuts against the end face of the stationary iron core 5 near the moving iron core 4. The length of the iron core spring 9 is greater than the sum of the depth of the spring receiving cavity 411 and the distance between the moving iron core 4 and the stationary iron core 5, so that the iron core spring 9 can be in a compressed and restored state.

[0050] In one embodiment, the moving iron core 4 further includes a first channel 43, a second channel 44, and a third channel 45. The first channel 43 is opened in the first shaft segment 41 and the first shaft segment 41 is connected to the spring receiving cavity 411. The second channel 44 is opened in the second shaft segment 42. The axis of the second channel 44 is perpendicular to the axis of the first channel 43 and the second channel 44 is connected to the first channel 43. The second channel 44 passes through the second shaft segment 42 radially. The third channel 45 is connected to the second channel 44.

[0051] like Figure 5 As shown, the first channel 43 is opened in the first shaft segment 41 and is connected to the spring receiving cavity 411. The second channel 44 is opened in the second shaft segment 42 and passes through the second shaft segment 42 radially. The second channel 44 is connected to the first channel 43. The third channel 45 is opened on the end face of the second shaft segment 42 away from the second shaft segment 42. The axis of the third channel 45 is parallel to the axis of the second shaft segment 42 and is connected to the second channel 44.

[0052] By setting the first channel 43, the second channel 44 and the third channel 45, the spaces between the moving iron core 4 and the stationary iron core 5, between the moving iron core 4 and the sleeve 6, and between the moving iron core 4 and the piston mounting cavity 73 can be interconnected, thereby reducing the probability that the moving iron core 4 will not be able to operate normally due to the partial vacuum state of the space inside the solenoid valve caused by the movement of the moving iron core 4.

[0053] like Figure 7 As shown, in some embodiments, the solenoid valve has an inlet P1, a valve port P2, and an outlet P3. The inlet P1 is located upstream of the valve port P2, and the outlet P3 is located downstream of the valve port P2. The inlet P1 is connected to the piston mounting cavity 73, the valve port P2 is connected to the piston mounting cavity 73, and the valve port P2 is connected to the outlet P3. The solenoid valve is configured to selectively open or close the valve port P2.

[0054] The solenoid valve is located between the inlet P1 and the outlet P3 of the flow channel, with a valve port P2 between them. The first body 72 or the second body 23 of the solenoid valve is installed at the valve port P2. The inlet P1 communicates with the piston mounting cavity 73. When the solenoid valve is closed, the sealing block 74 abuts against the valve port P2, blocking the flow of fluid from the outlet P1. When the solenoid valve is open, the sealing block 74 separates from the valve port P2, opening the flow of fluid from the outlet. The fluid flows through the inlet P1, the piston mounting cavity 73, the valve port P2, and the outlet P3. Similarly, in some other embodiments, the solenoid valve can be assembled with other components to form an integrated assembly. Optionally, the solenoid valve can be integrated with a thermostatic expansion valve, which has a fluid flow channel, an inlet P1, a valve port P2, and an outlet P3.

[0055] It should be noted that the above-described embodiments only illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be pointed out that those skilled in the art can make several modifications without departing from the concept of this utility model, and these modifications all fall within the protection scope of this utility model.

Claims

1. A solenoid valve, characterized in that, The solenoid valve includes a first magnetic conductor (2), a moving iron core (4), and a sleeve (6); at least a portion of the moving iron core (4) is located inside the sleeve (6), and the first magnetic conductor (2) and the sleeve (6) are abutted or fixedly connected. Along the radial direction of the sleeve (6), the first magnetic conductor (2) is disposed adjacent to the moving iron core (4).

2. The solenoid valve according to claim 1, characterized in that, Along the radial direction of the sleeve (6), a portion of the first magnetic conductor (2) is located between the sleeve (6) and the moving iron core (4).

3. The solenoid valve according to claim 1, characterized in that, The solenoid valve further includes a second magnetic conductor (3) and a coil assembly (1). The second magnetic conductor (3) has a first wall (31) and a mounting cavity (36). The first wall (31) defines a portion of the wall of the mounting cavity (36). The coil assembly (1) is located in the mounting cavity (36) along the radial direction of the moving iron core (4). The first wall (31) abuts against or is clearance-fitted with the first magnetic conductor (2).

4. The solenoid valve according to claim 2, characterized in that, The solenoid valve further includes a second magnetic conductor (3), the second magnetic conductor (3) having a first wall (31), the moving iron core (4) including a first shaft segment (41), the sleeve (6) being clearance-fitted with the first shaft segment (41), the first magnetic conductor (2) including a magnetic transmission part (21) and a magnetic guiding part (22), along the axial direction of the moving iron core (4), the magnetic transmission part (21) being located on the side of the magnetic guiding part (22) close to the first wall (31), the magnetic transmission part (21) abutting or clearance-fitting with the first wall (31), the magnetic guiding part (22) being located between the sleeve (6) and the moving iron core (4), and the magnetic guiding part (22) having a first gap (L1) between the moving iron core (4).

5. The solenoid valve according to claim 4, characterized in that, The moving iron core (4) also includes a second shaft section (42), and the solenoid valve also includes a valve seat (7). The valve seat (7) includes a protrusion (71) and a first body (72). The valve seat (7) has an iron core receiving cavity (711). The protrusion (71) defines the wall of the iron core receiving cavity (711). The protrusion (71) and the first body (72) are arranged side by side along the axial direction of the valve seat (7). The first body (72) abuts against the magnetic transmission part (21). Along the radial direction of the moving iron core (4), the protrusion (71) is located inside the magnetic transmission part (21), and the protrusion (71) is in clearance fit with the second shaft section (42); along the axial direction of the moving iron core (4), the protrusion (71) abuts against the magnetic conduction part (22); The protrusion (71) has a second gap (L2) between it and the second shaft segment (42), and the first gap (L1) is greater than or equal to the second gap (L2).

6. The solenoid valve according to claim 5, characterized in that, The valve seat (7) also has a piston mounting cavity (73), the first body (72) defines the wall of the piston mounting cavity (73), the solenoid valve also includes a piston (75) and a sealing block (74) located in the piston mounting cavity (73), the outer peripheral surface of the sealing block (74) is sealed to the inner peripheral surface of the piston (75), and the outer peripheral surface of the piston (75) is slidably connected to the first body (72).

7. The solenoid valve according to claim 4, characterized in that, The moving iron core (4) further includes a second shaft section (42), the first magnetic conductor (2) has an iron core receiving cavity (711), the magnetic conductor (22) defines a portion of the wall of the iron core receiving cavity (711), and the magnetic conductor (22) is clearance-fitted with the second shaft section (42).

8. The solenoid valve according to claim 7, characterized in that, The first magnetic conductor (2) has a second body (23) and a piston mounting cavity (73). The second body (23) defines the wall of the piston mounting cavity (73). The magnetic transmission part (21), the magnetic conductor (22), and the second body (23) are arranged side by side along the axial direction of the first magnetic conductor (2). The solenoid valve also includes a piston (75) and a sealing block (74) located in the piston mounting cavity (73). The outer peripheral surface of the sealing block (74) is sealed to the inner peripheral surface of the piston (75). The outer peripheral surface of the piston (75) is slidably connected to the second body (23).

9. The solenoid valve according to claim 6, characterized in that, The sealing block (74) has a flow channel hole (741), the axis of which coincides with the axis of the moving iron core (4). The end face of the moving iron core (4) near the piston (75) has a tapered portion (46). The diameter of the tapered portion (46) near the end of the moving iron core (4) is greater than the diameter of the tapered portion (46) away from the moving iron core (4), and the diameter of the tapered portion (46) away from the moving iron core (4) is smaller than the diameter of the flow channel hole (741) near the end of the tapered portion (46).

10. The solenoid valve according to claim 8, characterized in that, The first magnetic conductor (2) has a second body (23) and a piston mounting cavity (73). The second body (23) defines the wall of the piston mounting cavity (73). The magnetic transmission part (21), the magnetic conductor (22), and the second body (23) are arranged side by side along the axial direction of the first magnetic conductor (2). The solenoid valve also includes a piston (75) and a sealing block (74) located in the piston mounting cavity (73). The outer peripheral surface of the sealing block (74) is sealed to the inner peripheral surface of the piston (75). The sealing block (74) is slidably connected to the second body (23). The sealing block (74) has a flow channel hole (741). The axis of the flow channel hole (741) coincides with the axis of the moving iron core (4). The end face of the moving iron core (4) near the piston (75) has a tapered portion (46). The diameter of the tapered portion (46) near the end of the moving iron core (4) is greater than the diameter of the tapered portion (46) away from the moving iron core (4), and the diameter of the tapered portion (46) away from the moving iron core (4) is smaller than the diameter of the flow channel hole (741) near the end of the tapered portion (46).

11. The solenoid valve according to any one of claims 1 to 4, characterized in that, The solenoid valve also includes a housing (8), a coil assembly (1), a second magnetic conductor (3), a stationary iron core (5), and an iron core spring (9). The housing (8) is fixedly connected to the outside of the coil assembly (1). The housing (8) is located within the accommodating space defined by the second magnetic conductor (3), and the housing (8) is fixedly connected to the second magnetic conductor (3). The sleeve (6) is located inside the coil assembly (1). The stationary iron core (5) is located inside the sleeve (6) and is limitedly connected to the sleeve (6). The stationary iron core (5) is fixedly connected to the second magnetic conductor (3). One end of the iron core spring (9) abuts against the stationary iron core (5), and the other end abuts against the moving iron core (4).

12. The solenoid valve according to any one of claims 5 to 8, characterized in that, The second shaft segment (42) has a spring receiving cavity (411). The moving iron core (4) further includes a first channel (43), a second channel (44), and a third channel (45). The first channel (43) is opened in the first shaft segment (41) and the first shaft segment (41) is connected to the spring receiving cavity (411). The second channel (44) is opened in the second shaft segment (42). The axis of the second channel (44) is perpendicular to the axis of the first channel (43) and the second channel (44) is connected to the first channel (43). The second channel (44) passes through the second shaft segment (42) radially. The third channel (45) is connected to the second channel (44).

13. The solenoid valve according to any one of claims 8 to 10, characterized in that, The solenoid valve has an inlet (P1), a valve port (P2), and an outlet (P3). The inlet (P1) is located upstream of the valve port (P2), and the outlet (P3) is located downstream of the valve port (P2). The inlet (P1) communicates with the piston mounting cavity (73), the valve port (P2) communicates with the piston mounting cavity (73), and the valve port (P2) communicates with the outlet (P3). The solenoid valve is configured to selectively open or close the valve port (P2).

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