Electromagnetic coil structure and solenoid valve

Abstract

This invention provides an electromagnetic coil structure and an electromagnetic valve. The electromagnetic coil structure includes: an electromagnetic coil, a moving core iron, an attractor, a frame, and a magnetic sleeve. The electromagnetic coil is disposed on the frame. The moving core iron is movably located at one end of the frame along its axial direction, and the attractor is fixedly disposed at the other end of the frame along its axial direction. At least a portion of the magnetic sleeve is located inside the frame, and the magnetic sleeve is fixedly disposed on the frame and covers the outer periphery of the attractor. The end of the magnetic sleeve along its axial direction and close to the moving core iron is the magnetic end, and the end face of the attractor used to contact the moving core iron is the first end face, with the magnetic end extending axially beyond the first end face. This invention effectively reduces the magnetic resistance of the working air gap between the moving core iron and the attractor, increases the electromagnetic force applied to the moving core iron, making the start-up of the moving core iron faster, thereby improving the response speed and reliability of the electromagnetic valve and enhancing its switching capability.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic valve technology, and more specifically, to an electromagnetic coil structure and an electromagnetic valve. Background Technology

[0002] Currently, solenoid valves with electromagnetic coils are widely used in various devices to control the flow of fluids. The electromagnetic coil structure of existing solenoid valves typically includes an electromagnetic coil, a core iron, an attractor, and a frame. The electromagnetic coil is wound around the frame. When the electromagnetic coil is energized, the core iron moves under the action of electromagnetic force, attracting or separating from the attractor, thereby realizing the opening and closing of the solenoid valve. The distance between the core iron and the attractor is called the working air gap.

[0003] However, existing solenoid valves lack a structure to reduce the magnetic resistance of the working air gap, resulting in a small effective magnetic flux area at the working air gap. This leads to a large magnetic resistance in the working air gap, insufficient electromagnetic force applied to the core iron, making it difficult to start the core iron, and thus severely reducing the response speed and reliability of the solenoid valve.

[0004] Therefore, there is an urgent need for a structural design that can effectively reduce the magnetic resistance of the working air gap and improve the starting performance of the solenoid valve. Utility Model Content

[0005] This invention provides an electromagnetic coil structure and an electromagnetic valve to solve the problem that the electromagnetic valve has a large magnetic resistance in the working air gap, which leads to poor starting performance.

[0006] To address the aforementioned problems, according to one aspect of this utility model, an electromagnetic coil structure is provided, comprising: an electromagnetic coil, a moving core iron, an attractor, a frame, and a magnetic sleeve; the electromagnetic coil is disposed on the frame; the moving core iron is movably located at one end of the frame along the axial direction, and the attractor is fixedly disposed at the other end of the frame along the axial direction; at least a portion of the magnetic sleeve is located inside the frame, the magnetic sleeve is fixedly disposed on the frame, and covers the outer periphery of the attractor; wherein, the end of the magnetic sleeve along the axial direction and close to the moving core iron is the magnetic end, the end face of the attractor used to fit against the moving core iron is the first end face, and the magnetic end extends beyond the first end face along the axial direction.

[0007] Furthermore, the end face of the moving core iron that is used to fit against the first end face is the second end face; the movement range of the second end face has a top dead center and a bottom dead center. At the bottom dead center, the second end face fits against the first end face; at the top dead center, the distance between the second end face and the first end face is the greatest; the magnetic end extends beyond the top dead center or is flush with the top dead center.

[0008] Furthermore, the distance the second end face moves from the top dead center to the bottom dead center is the core iron stroke; taking the end face of the attractor that is axially away from the first end face as the reference plane, the distance between the magnetic end and the reference plane along the axial direction is the first distance, and the distance between the first end face and the reference plane along the axis is the second distance. The first distance is greater than the second distance, and the difference between the first distance and the second distance is equal to the core iron stroke.

[0009] Furthermore, the distance by which the magnetic conductor extends axially beyond the top dead center is called the overshoot distance, which is less than or equal to 0.2 mm.

[0010] Furthermore, the magnetic sleeve has a cylindrical tube structure, and the inside of the magnetic sleeve has a limiting cavity extending along the axial direction. At least a portion of the attractor is located in the limiting cavity and is limited and matched with the inner wall of the limiting cavity.

[0011] Furthermore, the magnetic sleeve includes a tube body and a flange. The magnetic end is one end of the tube body along its axial direction, and the flange is located at the end of the tube body away from the magnetic end. The flange is arranged around the circumference of the tube body and extends radially along the tube body. The tube body is located inside the skeleton, and the flange is matched with the skeleton for limiting. The tube body has a limiting cavity extending axially inside, and at least a portion of the attractor is located in the limiting cavity and is matched with the inner wall of the limiting cavity for limiting.

[0012] Furthermore, the magnetic sleeve is a cylindrical tube structure, and the inside of the magnetic sleeve has a limiting cavity extending along the axis. At least a part of the attractor is located in the limiting cavity and is limited and matched with the inner wall of the limiting cavity. The magnetic sleeve also has an axially extending groove, which is located on the side wall of the magnetic sleeve and is connected to the limiting cavity and the outside of the magnetic sleeve. The axially extending groove extends along the axis of the magnetic sleeve and is used to cut off the electromagnetic eddy currents around the circumference of the magnetic sleeve.

[0013] Furthermore, there are multiple axial extension slots, which are spaced apart along the circumference of the magnetic sleeve. The multiple axial extension slots include at least one of bidirectional through slots and unidirectional through slots. The two ends of the bidirectional through slot pass through the magnetic sleeve along the axial direction of the magnetic sleeve. The one-way through slot passes through the magnetic sleeve along the axial direction of the magnetic sleeve and at one end closer to the moving core iron, while at the end farther from the moving core iron, it does not pass through the magnetic sleeve.

[0014] Furthermore, the electromagnetic coil structure also includes a magnetic guide frame, at least a portion of which is made of a magnetically conductive material to conduct magnetic field lines; an attractor is fixedly mounted on the magnetic guide frame; wherein, the magnetic guide frame has a cavity inside, and at least a portion of the frame is located within the cavity.

[0015] Furthermore, a portion of the magnetic guide frame covers the outer periphery of the moving core iron, and the fit gap between this portion and the moving core iron is a non-working air gap; the electromagnetic coil structure also includes a secondary magnetic sleeve, which is fixedly installed, made of magnetically conductive material, and abuts against the magnetic guide frame to conduct magnetic field lines; a portion of the secondary magnetic sleeve is located within the non-working air gap and covers a portion of the outer periphery of the moving core iron; the outer periphery of the moving core iron and the inner wall of the secondary magnetic sleeve are in a sliding limiting fit.

[0016] According to another aspect of the present invention, a solenoid valve is provided, which includes the above-described electromagnetic coil structure.

[0017] Applying the technical solution of this utility model, this utility model provides an electromagnetic coil structure, including: an electromagnetic coil, a moving core iron, an attractor, a frame, and a magnetic sleeve; the electromagnetic coil is disposed on the frame; the moving core iron is movably located at one end of the frame along the axial direction, and the attractor is fixedly disposed at the other end of the frame along the axial direction; at least a portion of the magnetic sleeve is located inside the frame, the magnetic sleeve is fixedly disposed on the frame, and covers the outer periphery of the attractor; wherein, the end of the magnetic sleeve along the axial direction and close to the moving core iron is the magnetic end, the end face of the attractor used to fit with the moving core iron is the first end face, and the magnetic end extends beyond the first end face along the axial direction.

[0018] This invention, by incorporating a magnetically conductive sleeve, creates an effective magnetic field loop at the sleeve in addition to the existing magnetic field lines when the electromagnetic coil is energized. This optimizes the distribution of magnetic field lines, increases the magnetic flux area, effectively reduces the magnetic resistance of the working air gap between the moving core and the attractor, and increases the electromagnetic force applied to the moving core, making the start-up of the moving core faster. This, in turn, improves the response speed and reliability of the solenoid valve, resulting in a stronger valve-switching capability. By setting the magnetically conductive end to extend axially beyond the first end face, a portion of the magnetic field lines are transmitted to the moving core through the magnetically conductive sleeve, further reducing the magnetic resistance of the working air gap, increasing the magnetic field density of the moving core during startup, and improving the temperature rise of the electromagnetic coil. This invention has a simple structure, low cost, is easy to assemble and maintain, and is suitable for large-scale promotion and use. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0020] Figure 1 A schematic diagram of the internal structure of the electromagnetic coil structure provided in an embodiment of the present invention is shown;

[0021] Figure 2 A partial enlarged view of the electromagnetic coil structure provided in an embodiment of this utility model is shown;

[0022] Figure 3 A partial structural diagram of the electromagnetic coil structure provided in an embodiment of this utility model after removing the frame is shown.

[0023] Figure 4 A partial structural diagram of the electromagnetic coil structure provided in an embodiment of the present invention after removing the frame and the electromagnetic coil is shown.

[0024] Figure 5 A schematic diagram of the specific structure of the magnetic sleeve provided in Embodiment 1 of this utility model is shown;

[0025] Figure 6 A schematic diagram of the specific structure of the magnetic sleeve provided in Embodiment 2 of this utility model is shown;

[0026] Figure 7 A schematic diagram of the specific structure of the magnetic sleeve provided in Embodiment 3 of this utility model is shown;

[0027] Figure 8 A schematic diagram of the specific structure of the magnetic sleeve provided in Embodiment 4 of this utility model is shown;

[0028] Figure 9 A schematic diagram of the specific structure of the magnetic sleeve provided in Embodiment 5 of this utility model is shown;

[0029] Figure 10 A schematic diagram of the specific structure of the magnetic sleeve provided in Embodiment Six of this utility model is shown;

[0030] Figure 11 This diagram illustrates the experimental results of the magnetic flux density distribution when the axial length of the magnetic sleeve extending beyond the first end face is 0 mm, as provided in an embodiment of this utility model.

[0031] Figure 12 The diagram shows the experimental results of the magnetic flux density distribution when the axial length of the magnetic sleeve extending beyond the first end face is 0.8 mm, according to an embodiment of the present invention.

[0032] Figure 13 The diagram shows the experimental results of the magnetic flux density distribution when the axial length of the magnetic sleeve extending beyond the first end face is 1.4 mm, according to an embodiment of the present invention.

[0033] Figure 14 A schematic diagram showing the experimental results of the magnetic flux density distribution when the axial length of the magnetic sleeve extending beyond the first end face is 1.6 mm, according to an embodiment of the present invention;

[0034] Figure 15 A schematic diagram showing the experimental results of the magnetic flux density distribution when the axial length of the magnetic sleeve extending beyond the first end face is 1.8 mm, according to an embodiment of the present invention;

[0035] Figure 16 The diagram shows the experimental results of the magnetic flux density distribution when the axial length of the magnetic sleeve extending beyond the first end face is 3.2 mm, according to an embodiment of the present invention.

[0036] Figure 17 The statistics provided by the embodiments of this utility model are shown. Figures 11 to 16 A schematic diagram illustrating the mathematical relationship between the electromagnetic force on the moving core iron in a DC system and the axial length of the magnetic sleeve extending beyond the first end face, obtained from the experimental results.

[0037] Figure 18 This diagram illustrates the mathematical relationship between the electromagnetic force on the moving core iron in an AC system and the axial length of the magnetic sleeve extending beyond the first end face, obtained after testing according to this invention.

[0038] The above figures include the following reference numerals:

[0039] 10. Electromagnetic coil;

[0040] 20. Moving core; 21. Second end face;

[0041] 30. Attractor; 31. First end face; 32. Reference plane;

[0042] 40. Skeleton;

[0043] 50. Magnetic sleeve; 51. Magnetic end; 52. Limiting cavity; 53. Tube body; 54. Flanged edge; 55. Axial extension groove; 551. Two-way through groove; 552. One-way through groove;

[0044] 60. Magnetic guide frame; 61. Cavity; 62. Non-working air gap. Detailed Implementation

[0045] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0046] like Figures 1 to 18As shown, an embodiment of this utility model provides an electromagnetic coil structure, including: an electromagnetic coil 10, a moving core iron 20, an attractor 30, a frame 40, and a magnetic sleeve 50; the electromagnetic coil 10 is disposed on the frame 40; the moving core iron 20 is movably located at one end of the frame 40 in the axial direction, and the attractor 30 is fixedly disposed at the other end of the frame 40 in the axial direction; at least a portion of the magnetic sleeve 50 is located inside the frame 40, the magnetic sleeve 50 is fixedly disposed on the frame 40, and covers the outer periphery of the attractor 30; wherein, the end of the magnetic sleeve 50 along the axial direction and close to the moving core iron 20 is the magnetic end 51, the end face of the attractor 30 for contacting the moving core iron 20 is the first end face 31, and the magnetic end 51 extends beyond the first end face 31 in the axial direction.

[0047] This invention, by setting a magnetic sleeve 50, enables the electromagnetic coil 10 to form an effective magnetic field loop at the magnetic sleeve 50 in addition to the existing magnetic field lines when energized. This optimizes the distribution of magnetic field lines, increases the magnetic flux area, effectively reduces the magnetic resistance of the working air gap between the moving core iron 20 and the attractor 30, and increases the electromagnetic force applied to the moving core iron 20, making the start-up of the moving core iron 20 faster. This, in turn, improves the response speed and reliability of the solenoid valve and enhances its valve-switching capability. By setting the magnetic end 51 to extend axially beyond the first end face 31, a portion of the magnetic field lines are transmitted to the moving core iron 20 through the magnetic sleeve 50, further reducing the magnetic resistance of the working air gap, increasing the magnetic field line density of the moving core iron 20 during start-up, and improving the temperature rise of the electromagnetic coil 10. This invention has a simple structure and low cost, is easy to assemble and maintain, and is suitable for large-scale promotion and use.

[0048] It should be noted that the axial direction of the moving core 20 and the axial direction of the attractor 30 are parallel to the axial direction of the frame 40, respectively; the axial direction of the magnetic sleeve 50 is parallel to the axial direction of the frame 40. The axial direction mentioned in this article is with reference to the frame 40, the moving core 20, and the attractor 30, and the axial direction is the direction of extension of the frame 40, the moving core 20, and the attractor 30; the direction around the axial direction is the circumferential direction, and the direction where the diameter of the moving core 20 and the attractor 30 is located is the radial direction.

[0049] like Figure 1 and Figure 2 As shown, the end face of the moving core 20 that is used to fit with the first end face 31 is the second end face 21; the movement range of the second end face 21 has an upper dead point and a lower dead point. At the lower dead point, the second end face 21 fits with the first end face 31; at the upper dead point, the distance between the second end face 21 and the first end face 31 is the largest; the magnetic end 51 extends beyond the upper dead point or is flush with the upper dead point.

[0050] This design ensures that the magnetic end 51 of the magnetic sleeve 50 can effectively participate in the transmission of magnetic field lines regardless of the position of the moving core iron 20. Especially when the moving core iron 20 is at top dead center, the extended design of the magnetic end 51 further strengthens the electromagnetic force, ensuring the stability and response speed of the moving core iron 20. Even under large-stroke working air gap conditions, it guarantees the efficient operation of the electromagnetic coil structure, reduces start-up delay, and improves the control accuracy of the solenoid valve. Application scenarios cover all solenoid valves requiring electromagnetic coil structure control, especially those systems that require high response speed even under large strokes, such as electromagnetic control valves in high-pressure hydraulic systems.

[0051] like Figure 1 and Figure 2 As shown, the distance the second end face 21 moves from the top dead center to the bottom dead center is the core iron stroke; taking the end face of the attractor 30 that is axially away from the first end face 31 as the reference surface 32, the distance between the magnetic end 51 and the reference surface 32 along the axial direction is the first distance, and the distance between the first end face 31 and the reference surface 32 along the axial direction is the second distance. The first distance is greater than the second distance, and the difference between the first distance and the second distance is equal to the core iron stroke (that is, the length of the magnetic end 51 beyond the first end face 31 is the same as the core iron stroke).

[0052] By precisely designing the position of the magnetic conductor end 51, the optimal electromagnetic force transmission path is maintained throughout the entire stroke of the moving core iron 20, ensuring maximum electromagnetic force. This design allows the electromagnetic coil structure to provide stable electromagnetic force at any position of the moving core iron 20, enhancing the control capability and service life of the solenoid valve. Application scenarios include various solenoid valve systems requiring precise control of the moving core iron 20, such as electromagnetic fine-tuning valves in precision instruments, or solenoid valves requiring frequent switching; this design significantly improves the overall system performance.

[0053] Specifically, the distance by which the magnetic end 51 extends beyond the top dead center along the axial direction is called the excess distance, which is less than or equal to 0.2 mm.

[0054] This configuration optimizes the distribution of electromagnetic force by slightly exceeding the allowable distance without adding excessive magnetic resistance, ensuring that the density of electromagnetic force is maximized when the moving core iron 20 starts. Even with the smallest allowable distance, it can significantly improve the starting performance of the electromagnetic coil structure, reduce the temperature rise of the electromagnetic coil, and extend the service life of the solenoid valve.

[0055] like Figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10As shown, the magnetic sleeve 50 is a cylindrical tube structure. The magnetic sleeve 50 has an axially extending limiting cavity 52 inside. At least a portion of the attractor 30 is located in the limiting cavity 52 and is limited and matched with the inner wall of the limiting cavity 52.

[0056] The structure of the limiting cavity 52 not only provides precise positioning for the attractor 30, but also optimizes the flow path of the magnetic field lines and reduces the loss of magnetic flux. The above design improves the magnetic flux efficiency of the electromagnetic coil structure, making the electromagnetic force more concentrated and enhancing the control capability of the solenoid valve. This design can significantly improve the electromagnetic control accuracy and reliability of the system.

[0057] like Figure 8 , Figure 9 and Figure 10 As shown, the magnetic sleeve 50 includes a tube body 53 and a flange 54. The magnetic end 51 is one end of the tube body 53 along its axial direction. The flange 54 is disposed at the end of the tube body 53 away from the magnetic end 51. The flange 54 is arranged around the circumference of the tube body 53 and extends radially along the tube body 53. The tube body 53 is located inside the skeleton 40, and the flange 54 is in a limiting fit with the skeleton 40. The tube body 53 has a limiting cavity 52 extending axially inside. At least a portion of the attractor 30 is located in the limiting cavity 52 and is in a limiting fit with the inner wall of the limiting cavity 52.

[0058] The limiting cooperation between the flange 54 and the frame 40 ensures the stable installation of the magnetic sleeve 50. At the same time, the limiting cavity 52 provides precise positioning for the attractor 30 and optimizes the flow path of the magnetic field lines. The above design improves the overall stability of the electromagnetic coil structure, reduces the leakage of magnetic flux, and enhances the transmission efficiency of electromagnetic force.

[0059] like Figure 4 , Figure 6 , Figure 7 , Figure 9 and Figure 10 As shown, the magnetic sleeve 50 is a cylindrical tube structure. The magnetic sleeve 50 has an axially extending limiting cavity 52 inside. At least a part of the attractor 30 is located in the limiting cavity 52 and is limited and matched with the inner wall of the limiting cavity 52. ​​The magnetic sleeve 50 also has an axially extending groove 55, which is located on the side wall of the magnetic sleeve 50 and is connected to the limiting cavity 52 and the outside of the magnetic sleeve 50. The axially extending groove 55 extends along the axial direction of the magnetic sleeve 50 and is used to cut off the electromagnetic eddy currents around the magnetic sleeve 50 in the circumferential direction.

[0060] By incorporating the axial extension groove 55, potential electromagnetic eddy currents are effectively blocked, reducing energy loss and improving the electromagnetic efficiency of the electromagnetic coil structure. This design ensures efficient operation of the electromagnetic coil structure even in high-frequency electromagnetic field environments, reducing electromagnetic interference and improving the control accuracy of the solenoid valve. Applications are primarily concentrated in high-frequency electromagnetic control fields, such as high-speed solenoid valve control systems, where this design effectively reduces the impact of electromagnetic eddy currents and improves the system's electromagnetic control performance.

[0061] like Figure 7 and Figure 10 As shown, there are multiple axial extension grooves 55, which are spaced apart circumferentially along the magnetic sleeve 50. The multiple axial extension grooves 55 include at least one of a bidirectional through groove 551 and a unidirectional through groove 552. The two ends of the bidirectional through groove 551 pass through the magnetic sleeve 50 along the axial direction of the magnetic sleeve 50, respectively. The one-way through groove 552 passes through the magnetic sleeve 50 along the axial direction of the magnetic sleeve 50 and is closer to the moving core iron 20 at one end, while the end away from the moving core iron 20 does not pass through the magnetic sleeve 50.

[0062] By incorporating multiple axially extending slots 55, particularly the combination of bidirectional and unidirectional through slots, effective management and control of electromagnetic eddy currents are achieved, ensuring the optimal flow path of magnetic field lines. This design enhances the adaptability and stability of the electromagnetic coil structure in complex electromagnetic environments, improves the transmission efficiency of electromagnetic forces, and reduces electromagnetic interference. Applications include all solenoid valve systems requiring stable operation in complex electromagnetic environments; this design significantly improves the system's electromagnetic compatibility and control performance.

[0063] It should be noted that: the closed-loop tubular magnetic sleeve 50 (e.g., in the alternating magnetic field of an AC system) Figure 5 The magnetic sleeve 50 of Embodiment 1 shown in the figure inevitably exhibits eddy current phenomena. The induced current generated forms a ring current along the circumference of the magnetic sleeve 50. According to Ampere's right-hand rule, this current will excite a magnetic field in the opposite direction to the magnetic field generated by the electromagnetic coil 10, thus reducing the original magnetic field strength. To avoid this phenomenon, an axially extending groove 55 is provided on the magnetic sleeve 50 to perform open-loop processing, and further segmentation is performed on this basis to block the formation of the ring current and further reduce the adverse effects of eddy currents.

[0064] It is worth noting that: Figures 5 to 10 The following are schematic diagrams illustrating the specific structure of the magnetic sleeve 50 provided in embodiments one through six of this utility model. Figure 5 The magnetic sleeve 50 structure shown in Embodiment 1 is the most basic and simple. Starting from different inventive concepts, in... Figure 5 By modifying the structure, we can obtain Figures 6 to 10 50mm magnetic sleeve in the middle; Figure 5 Example 1 Figure 6 Example 2 and Figure 7 In the third embodiment, the magnetic sleeve 50 is a constant diameter through pipe and does not have a flange 54. Figure 6 Example 2 and Figure 7 In the third embodiment, the magnetic sleeve 50 has an axial extension groove 55 along its axial direction; in the actual manufacturing of the solenoid valve, the magnetic sleeve 50 and the frame 40 can also be directly integrally machined to reduce the assembly process of the electromagnetic coil structure. Figure 8 Example 4 Figure 9 Example 5 and Figure 10 In Embodiment Six, a flange 54 is designed to increase the contact area with the magnetic guide frame 60 and increase the magnetic flux transmission efficiency, and to facilitate the installation and fixation of the magnetic guide sleeve 50. Figure 7 and Figure 10 By setting multiple axially extending slots 55 (e.g., one bidirectional through slot 551 and multiple unidirectional through slots 552), a segmented magnetic sleeve structure is formed. The number of segments is multiple, and the segmentation is based on the eddy current effect to reduce the adverse effects of the eddy current phenomenon. The actual number of segments formed is not limited to... Figure 7 and Figure 10 As shown;

[0065] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the electromagnetic coil structure also includes a magnetic guide frame 60, at least a portion of which is made of magnetic material to conduct magnetic field lines; an attractor 30 is fixedly mounted on the magnetic guide frame 60; wherein, the magnetic guide frame 60 has a cavity 61 inside, and at least a portion of the frame 40 is located inside the cavity 61.

[0066] By incorporating the magnetic guide frame 60, the magnetic circuit design of the electromagnetic coil structure is further optimized, ensuring efficient flow of magnetic field lines and reducing magnetic resistance. This design improves the overall electromagnetic efficiency of the electromagnetic coil structure, enhancing the control capability and response speed of the solenoid valve. Application scenarios include all solenoid valve systems requiring efficient electromagnetic control, such as solenoid valves in automotive fuel injection systems or electromagnetic control components in air conditioning systems. This design significantly improves the electromagnetic control performance and reliability of the system.

[0067] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, a portion of the magnetic guide frame 60 covers the outer periphery of the moving core iron 20, and the fitting gap between this portion and the moving core iron 20 is the non-working air gap 62; the electromagnetic coil structure also includes a secondary magnetic sleeve, which is fixedly installed, made of magnetically conductive material, and abuts against the magnetic guide frame 60 to conduct magnetic field lines; a portion of the secondary magnetic sleeve is located within the non-working air gap 62 and covers a portion of the outer periphery of the moving core iron 20; the outer periphery of the moving core iron 20 and the inner wall of the secondary magnetic sleeve are in sliding limiting fit.

[0068] By setting up the auxiliary magnetic sleeve, the magnetic circuit design of the electromagnetic coil structure is further optimized, especially its application in the non-working air gap 62, which ensures efficient flow of magnetic field lines, reduces magnetic resistance, and provides additional guidance and limiting for the moving core iron 20. This setting improves the overall electromagnetic efficiency of the electromagnetic coil structure, enhances the control capability and response speed of the solenoid valve, and improves the stability and reliability of the system. This design can significantly improve the electromagnetic control performance and reliability of the system, while reducing energy waste in the non-working state.

[0069] In addition, by setting the auxiliary magnetic sleeve, the magnetic resistance of the non-working air gap 62 between the moving core iron 20 and the magnetic guide frame 60 is effectively reduced.

[0070] This utility model also provides a solenoid valve, which includes the above-described electromagnetic coil structure.

[0071] Integrating the optimized electromagnetic coil structure described above into the solenoid valve improves its overall performance and reliability. This results in faster response, higher control precision, and stronger electromagnetic force, while effectively controlling the temperature rise of the electromagnetic coil and extending the valve's service life.

[0072] The specific experimental process and principle of one embodiment of this utility model will now be described in detail below:

[0073] Figures 11 to 16 The experimental results show the magnetic flux density distribution when the axial length of the magnetic sleeve extending beyond the first end face ranges from 0 to 3.2 mm. Zlength in the figure represents the extended axial length. Figures 11 to 16 The distribution of magnetic flux density under different axial lengths of excess is shown in turn; Figures 11 to 16 The experiment used the controlled variable method, with the independent variable being the axial length of the magnetic sleeve extending beyond the first end face, and the dependent variable being the magnetic flux density distribution; the core iron stroke was 1.6 mm during the experiment. Figure 17 Statistics are shown Figures 11 to 16 The mathematical relationship between the electromagnetic force on the moving core iron and the axial length of the magnetic sleeve extending beyond the first end face, obtained from the experimental results, is shown in the following diagram. Figure 17 The horizontal axis represents the axial length of the magnetic sleeve extending beyond the first end face, and the vertical axis represents the electromagnetic force exerted on the moving core iron 20.

[0074] from Figure 17 It can be clearly seen that in a DC system, the electromagnetic force on the moving core iron 20 increases with the axial length of the magnetic sleeve 50 (i.e., the closer the magnetic end 51 is to the first end face 31, the greater the electromagnetic force). If the core iron stroke of the moving core iron 20 is set to 'a', and the axial length of the magnetic sleeve 50 extending beyond the first end face is 'b', the increase in electromagnetic force is more significant when b > 0. When b = a, the electromagnetic force reaches its maximum value. When b > a, the electromagnetic force begins to decrease from its peak value. Therefore, through experiments, it can be concluded that in a DC system, when the axial length b of the magnetic sleeve 50 extending beyond the first end face is near 'a', the electromagnetic force is at a relatively high level.

[0075] Based on the same experimental logic described above, similar controlled variable experiments were conducted in the AC power system, such as... Figure 18 As shown, Figure 18 The mathematical relationship between the electromagnetic force on the moving core iron in an AC system and the axial length of the magnetic sleeve extending beyond the first end face is shown. In this experiment, the core iron stroke was 1.6 mm, and the total axial length of the magnetic sleeve 50 was 10.1 mm. Figure 18 It can be clearly seen that in the AC system, the mathematical relationship between the electromagnetic force on the moving core iron and the axial length of the magnetic sleeve extending beyond the first end face is basically the same as that in the DC system described above. That is, the electromagnetic force on the moving core iron 20 increases with the axial length of the magnetic sleeve 50 (i.e., the closer the magnetic end 51 is to the first end face 31, the greater the electromagnetic force). Let the core iron stroke of the moving core iron 20 be a, and the axial length of the magnetic sleeve 50 extending beyond the first end face be b. When b > 0, the increase in electromagnetic force is more obvious. When b = a, the electromagnetic force reaches its maximum value. When b > a, the electromagnetic force starts to decrease from the peak value. Therefore, through experiments, it can be seen that in the AC system, when the axial length b of the magnetic sleeve 50 extending beyond the first end face is near a, the electromagnetic force is at a relatively high level.

[0076] Therefore, the magnetic sleeve 50 in this invention significantly improves the electromagnetic force by optimizing its axial length. Especially when the magnetic resistance of the large-stroke working air gap is high, it effectively reduces the magnetic resistance and enhances the starting performance of the solenoid valve. Simultaneously, the arrangement of multiple axial extension slots 55, particularly the combination of bidirectional and unidirectional through slots, blocks the formation of circular currents, further reducing the adverse effects of eddy currents and improving the temperature rise of the electromagnetic coil structure. In DC systems, the electromagnetic force reaches its maximum value and performance improvement is most significant when the axial length of the magnetic sleeve 50 extending beyond the first end face is equal to the core iron stroke. In AC systems, the axial extension slots 55 further block the formation of circular currents, minimizing the influence of eddy currents and further enhancing the electromagnetic force and starting performance. This invention not only reduces costs but also simplifies the installation process, is applicable to electromagnetic coil structures with different frame types, and has broad market application prospects.

[0077] In summary, this invention provides an electromagnetic coil structure and an electromagnetic valve. By setting a magnetic sleeve 50, the electromagnetic coil 10, when energized, forms an effective magnetic field loop at the magnetic sleeve 50 in addition to the existing magnetic field lines. This optimizes the distribution of magnetic field lines, increases the magnetic flux area, effectively reduces the magnetic resistance of the working air gap between the moving core iron 20 and the attractor 30, and increases the electromagnetic force applied to the moving core iron 20, making the start-up of the moving core iron 20 faster. This, in turn, improves the response speed and reliability of the electromagnetic valve, and enhances its valve-switching capability. By setting the magnetic end 51 to extend axially beyond the first end face 31, a portion of the magnetic field lines are transmitted to the moving core iron 20 through the magnetic sleeve 50, further reducing the magnetic resistance of the working air gap, increasing the magnetic field density of the moving core iron 20 during startup, and improving the temperature rise of the electromagnetic coil 10. This invention has a simple structure and low cost, is easy to assemble and maintain, and is suitable for large-scale promotion and use.

[0078] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0079] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0080] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0081] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0082] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0083] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electromagnetic coil structure, characterized by, include: The electromagnetic coil (10), the moving core iron (20), the attractor (30), the frame (40), and the magnetic sleeve (50) are arranged on the frame (40). The moving core iron (20) is movably located at one end of the frame (40) in the axial direction, and the attractor (30) is fixedly arranged at the other end of the frame (40) in the axial direction. At least a portion of the magnetic sleeve (50) is located inside the frame (40), and the magnetic sleeve (50) is fixedly arranged on the frame (40) and covers the outer periphery of the attractor (30). The end of the magnetic sleeve (50) along the axial direction and close to the moving core iron (20) is the magnetic end (51), the end face of the attractor (30) used to fit with the moving core iron (20) is the first end face (31), and the magnetic end (51) extends beyond the first end face (31) in the axial direction.

2. The electromagnetic coil structure of claim 1, wherein, The moving core iron (20) has a second end face (21) for contacting the first end face (31); the movement range of the second end face (21) has an upper dead point and a lower dead point. At the lower dead point, the second end face (21) is in contact with the first end face (31); at the upper dead point, the distance between the second end face (21) and the first end face (31) is the largest; the magnetic end (51) extends beyond the upper dead point or is flush with the upper dead point.

3. The electromagnetic coil structure of claim 2, wherein, The distance the second end face (21) moves from the upper dead point to the lower dead point is the core iron stroke; taking the end face of the attractor (30) away from the first end face (31) along the axial direction as the reference surface (32), the distance between the magnetic end (51) and the reference surface (32) along the axial direction is the first distance, and the distance between the first end face (31) and the reference surface (32) along the axial direction is the second distance. The first distance is greater than the second distance, and the difference between the first distance and the second distance is equal to the core iron stroke.

4. The electromagnetic coil structure of claim 2, wherein, The distance by which the magnetic end (51) extends axially beyond the upper stop point is the excess distance, which is less than or equal to 0.2 mm.

5. The electromagnetic coil structure of claim 1, wherein, The magnetic sleeve (50) is a cylindrical tube structure. The magnetic sleeve (50) has an axially extending limiting cavity (52) inside. At least a portion of the attractor (30) is located in the limiting cavity (52) and is limited and matched with the inner wall of the limiting cavity (52).

6. The electromagnetic coil structure of claim 1, wherein, The magnetic sleeve (50) includes a tube (53) and a flange (54). The magnetic end (51) is one axial end of the tube (53). The flange (54) is located at one end of the tube (53) away from the magnetic end (51). The flange (54) is arranged around the circumference of the tube (53) and extends radially along the tube (53). The tube (53) is located inside the skeleton (40). The flange (54) is in a limiting fit with the skeleton (40). The tube (53) has a limiting cavity (52) extending axially inside. At least a portion of the attractor (30) is located in the limiting cavity (52) and is in a limiting fit with the inner wall of the limiting cavity (52).

7. The electromagnetic coil structure of claim 1, wherein, The magnetic sleeve (50) is a cylindrical tube structure. The magnetic sleeve (50) has an axially extending limiting cavity (52) inside. At least a portion of the attractor (30) is located in the limiting cavity (52) and is limited and matched with the inner wall of the limiting cavity (52). The magnetic sleeve (50) also has an axially extending groove (55). The axially extending groove (55) is located on the side wall of the magnetic sleeve (50). The axially extending groove (55) is connected to the limiting cavity (52) and the outside of the magnetic sleeve (50) respectively. The axially extending groove (55) extends along the axial direction of the magnetic sleeve (50) and is used to cut off the electromagnetic eddy currents around the circumference of the magnetic sleeve (50).

8. The electromagnetic coil structure of claim 7, wherein, There are multiple axial extension grooves (55), and the multiple axial extension grooves (55) are arranged at intervals along the circumference of the magnetic sleeve (50); the multiple axial extension grooves (55) include at least one of bidirectional through groove (551) and unidirectional through groove (552). The bidirectional through groove (551) passes through the magnetic sleeve (50) at both ends along the axial direction of the magnetic sleeve (50); the unidirectional through groove (552) passes through the magnetic sleeve (50) at one end along the axial direction of the magnetic sleeve (50) and closer to the moving core iron (20), while the other end away from the moving core iron (20) does not pass through the magnetic sleeve (50).

9. The electromagnetic coil structure of claim 1, wherein, The electromagnetic coil structure further includes a magnetic guide frame (60), at least a portion of which is made of magnetic material to conduct magnetic field lines; the attractor (30) is fixedly mounted on the magnetic guide frame (60); wherein the magnetic guide frame (60) has a cavity (61) inside, and at least a portion of the skeleton (40) is located inside the cavity (61).

10. The electromagnetic coil structure of claim 9, wherein, A portion of the magnetic guide frame (60) covers the outer periphery of the moving core iron (20), and the fitting gap between this portion and the moving core iron (20) is a non-working air gap (62); the electromagnetic coil structure also includes a secondary magnetic sleeve, which is fixedly installed, the secondary magnetic sleeve is made of magnetically conductive material, and abuts against the magnetic guide frame (60) to conduct magnetic field lines; a portion of the secondary magnetic sleeve is located in the non-working air gap (62), and covers a portion of the outer periphery of the moving core iron (20); The outer periphery of the moving core iron (20) is slidably limited to the inner wall of the auxiliary magnetic sleeve.

11. An electromagnetic valve characterized by comprising: The electromagnetic valve includes the electromagnetic coil structure according to any one of claims 1 to 10.

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