A heat dissipation device for an electromagnetic coil

Abstract

The utility model relates to the technical field of electromagnetic coil discloses a heat abstractor of electromagnetic coil, including heat pipe, water cooling element, heat pipe includes inner cylindrical wall, outer cylindrical wall and end wall, end wall is located at the both ends of inner cylindrical wall and outer cylindrical wall and is used to close inner cylindrical wall with outer cylindrical wall, the annular cavity for accommodating heat transfer working medium is formed between inner cylindrical wall, outer cylindrical wall and end wall, heat pipe is sleeved in the outside of electromagnetic coil, and inner cylindrical wall is closely combined with the outer surface of electromagnetic coil, water cooling element is sleeved in the outside of heat pipe, and water cooling element is closely combined with outer cylindrical wall. Through the heat pipe and water cooling combination mode realizes the double heat dissipation of electromagnetic coil, reduces the heat accumulation of coil body, promotes overall heat dissipation efficiency, avoids the problems such as the increase of electromagnetic coil resistance, the reduction of magnetic field intensity caused by high temperature.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic coil technology, and more specifically to a heat dissipation device for electromagnetic coils. Background Technology

[0002] An electromagnetic coil is a basic electronic component that operates based on Faraday's law of electromagnetic induction. Its main structure includes a frame, windings, and an insulating layer. The electromagnetic coil used in solenoid valves is the core driving component, converting electrical energy into magnetic force to control the mechanical movement of the valve core or armature, thereby achieving fluid flow control, flow regulation, or direction switching. It is crucial for the solenoid valve to achieve the conversion of "electrical energy - magnetic field energy - mechanical energy," directly affecting the valve's response speed, reliability, and service life. However, energy loss is inevitable during energy conversion. During electrical energy conversion, some energy in the electromagnetic coil is converted into heat, causing the coil to heat up. With prolonged energization, the electromagnetic coil continuously generates energy loss, and the heat cannot be dissipated in time, leading to accumulated temperature increases and increased coil resistance. Since the voltage remains constant, the coil current decreases, the induced magnetic field strength decreases, and the performance of the electromagnetic coil deteriorates, easily causing problems such as valve jamming. Utility Model Content

[0003] To address the problem that when an electromagnetic coil is energized for a long time, the heat buildup and inadequate heat dissipation can lead to excessive temperature rise, resulting in increased coil resistance, weakened induced magnetic field strength, and consequently, valve jamming, this invention provides a heat dissipation device for electromagnetic coils.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A heat dissipation device for an electromagnetic coil includes a heat pipe and a water-cooling element. The heat pipe includes an inner cylindrical wall, an outer cylindrical wall, and an end wall. The end wall is located at both ends of the inner cylindrical wall and the outer cylindrical wall and is used to close the inner cylindrical wall and the outer cylindrical wall. An annular cavity for accommodating a heat transfer medium is formed between the inner cylindrical wall, the outer cylindrical wall, and the end wall. The heat pipe is sleeved on the outside of the electromagnetic coil, and the inner cylindrical wall is in close contact with the outer surface of the electromagnetic coil. The water-cooling element is sleeved on the outside of the heat pipe, and the water-cooling element is in close contact with the outer cylindrical wall.

[0006] As an alternative, a capillary core is provided on the inner wall of the annular cavity. The capillary core is made of copper powder and is attached to the inner wall of the annular cavity by high-temperature sintering. The capillary core is continuously distributed along the circumference of the heat pipe and continuously covers the inner wall of the annular cavity along the axial direction of the heat pipe.

[0007] As an alternative, the annular cavity is provided with support members at uniform intervals, the inner wall of the support member abutting against the inner cylindrical wall, and the outer wall of the support member abutting against the outer cylindrical wall.

[0008] As an alternative, one end of the heat pipe extends out of the electromagnetic coil, and the water-cooling element is fitted onto the outer peripheral wall of the portion of the heat pipe that extends out of the electromagnetic coil.

[0009] Alternatively, the heat pipe may be made of a copper-aluminum composite material.

[0010] As an alternative, the water-cooling element includes an inlet port, an outlet port, and a circulation channel. The circulation channel is fitted outside the heat pipe. The inlet port and the outlet port are detachably connected to both ends of the circulation channel. Cooling water circulates in the circulation channel through the inlet port and the outlet port.

[0011] As an alternative, multiple ribs are evenly spaced within the circulating water channel, dividing the circulating water channel into multiple annular channels.

[0012] Alternatively, the contact surface between the inner cylindrical wall and the electromagnetic coil is coated with thermally conductive silicone grease; the contact surface between the outer cylindrical wall and the water-cooling element is coated with thermally conductive silicone grease.

[0013] As an alternative, the two ends of the circulating water channel are respectively provided with an inlet turning bend and an outlet turning bend. The inlet turning bend and the outlet turning bend are integrally formed with the circulating water channel. A clamping port that cooperates with the heat pipe clamp is formed between the inlet turning bend and the outlet turning bend. The inlet interface and the outlet interface are detachably connected to the inlet turning bend and the outlet turning bend, respectively.

[0014] As an alternative, the electromagnetic coil includes a frame, a winding, a plastic coating layer, a bracket, and a plug. The winding is wound around the frame, and the frame and the outer side of the winding are coated with plastic to form a plastic coating layer. The plug extends along one radial side of the plastic coating layer, and the bracket surrounds the periphery of the plastic coating layer. The heat pipe has a clearance notch that engages with the coil plug.

[0015] The beneficial effects of this utility model are:

[0016] This invention employs a combination of heat pipes and water cooling to achieve dual heat dissipation for the electromagnetic coil. The heat pipe, with its high thermal conductivity, can quickly and maximally transfer the heat generated by the electromagnetic coil during operation to the water-cooling element, effectively reducing heat buildup in the coil itself. The water-cooling element, relying on the much higher heat transfer coefficient of water compared to natural air convection, can efficiently remove the heat transferred by the heat pipe through forced convection, significantly improving overall heat dissipation efficiency. This ensures that the electromagnetic coil remains within a reasonable operating temperature range even under harsh conditions such as high-temperature environments or prolonged full-load operation. This not only stably guarantees the electromagnetic performance of the coil (avoiding problems such as increased resistance and reduced magnetic field strength caused by high temperatures), but also reduces the aging rate of the insulation material caused by long-term high temperatures, delaying coil performance degradation and extending its service life. Attached Figure Description

[0017] Figure 1 A cross-sectional view of the first embodiment of the heat dissipation device for the electromagnetic coil provided by this utility model.

[0018] Figure 2 A partially enlarged view of the first embodiment of the heat dissipation device for the electromagnetic coil provided by this utility model;

[0019] Figure 3 A cross-sectional view of a second embodiment of the heat dissipation device for the electromagnetic coil provided by this utility model;

[0020] Figure 4 A schematic diagram of the heat dissipation device for the electromagnetic coil provided by this utility model.

[0021] In the picture:

[0022] 1. Heat pipe; 11. Inner cylindrical wall; 12. Outer cylindrical wall; 13. Annular cavity; 2. Water-cooling element;

[0023] 21. Water inlet; 22. Water outlet; 23. Circular water channel; 3. Electromagnetic coil; 31. Frame;

[0024] 32. Winding; 33. Plastic sheath; 34. Bracket; 35. Plug; 4. Capillary core; 5. Support component;

[0025] 6. Ribs; 7. Thermal grease; 8. Clearance notch; 9. Water inlet turning elbow;

[0026] 10. Water outlet turning elbow; 110. Clamping port. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not the entire structure.

[0028] In the description of this embodiment, "evaporation section" refers to the section where heat pipe 1 contacts electromagnetic coil 3, and "condensation section" refers to the section where heat pipe 1 contacts water cooling element 2.

[0029] Reference Figure 1 , Figure 2 This invention provides a heat dissipation device for an electromagnetic coil, comprising a heat pipe 1 and a water-cooling element 2. The heat pipe 1 includes an inner cylindrical wall 11, an outer cylindrical wall 12, and end walls. The inner cylindrical wall 11 and the outer cylindrical wall 12 are concentrically arranged, and the outer diameter of the outer cylindrical wall 12 is larger than the outer diameter of the inner cylindrical wall 11. An annular gap is formed between the outer peripheral wall of the inner cylindrical wall 11 and the inner peripheral wall of the outer cylindrical wall 12. The end walls are located at both ends of the inner cylindrical wall 11 and the outer cylindrical wall 12 to close the annular gap, thereby forming an annular cavity 13 for accommodating the heat transfer medium. In this embodiment, the heat transfer medium is water, which has high latent heat of vaporization and low cost.

[0030] A capillary wick 4 is provided on the inner wall of the annular cavity 13. The capillary wick 4 is made of copper powder and is attached to the inner wall of the annular cavity 13 by a high-temperature sintering process. Specifically, the capillary wick 4 is continuously and uninterruptedly distributed along the circumference of the heat pipe 1. That is, on the cross-section of the heat pipe 1 (the cross-section perpendicular to the axial direction of the heat pipe 1), the capillary wick 4 forms a closed annular structure along the inner wall of the annular cavity 13 without any breaks or gaps. This ensures that uniform capillary force can be generated through the capillary wick 4 at any circumferential angle, avoiding the problem of poor working fluid return caused by the absence of capillary wick 4 in some areas. It is especially suitable for scenarios where the heat pipe 1 is working at different tilt angles. Meanwhile, the capillary wick 4 continuously covers the inner wall of the annular cavity 13 along the axial direction of the heat pipe 1, that is, the capillary wick 4 extends from one end of the annular cavity 13 to the other end, forming a continuous and uninterrupted covering layer. This ensures that the working fluid forms a complete reflux channel between the evaporation section and the condensation section of the heat pipe 1, which is beneficial for the capillary wick 4 to stably transport the condensed working fluid back to the evaporation section, thereby improving the heat transfer efficiency and operational stability of the heat pipe 1. In this embodiment, the heat pipe 1 is made of copper-aluminum composite material, which combines the high thermal conductivity of copper and the lightweight of aluminum, reducing the overall weight of the heat pipe 1. However, its hardness is low, making it prone to deformation. Therefore, annular support members 5 are evenly spaced inside the annular cavity 13. The inner wall of the support member 5 abuts against the inner cylindrical wall 11, and the outer wall of the support member 5 abuts against the outer cylindrical wall 12, providing support for the heat pipe 1 and preventing deformation of the heat pipe 1. This is especially suitable for scenarios where the heat pipe 1 is long.

[0031] A heat pipe 1 is fitted around an electromagnetic coil 3, with its inner cylindrical wall 11 tightly fitted to the outer surface of the electromagnetic coil 3. A water-cooling element 2 is fitted around the heat pipe 1, with its outer cylindrical wall 12 tightly fitted to the heat pipe 1. In the first embodiment, refer to... Figure 1 In this embodiment, the axial length of heat pipe 1 is greater than that of electromagnetic coil 3, and one end of heat pipe 1 extends beyond electromagnetic coil 3. Water-cooling element 2 is fitted onto the outer peripheral wall of the portion of heat pipe 1 extending beyond electromagnetic coil 3. In this embodiment, the end of heat pipe 1 that contacts water-cooling element 2 is detached from the heating area due to its extension beyond electromagnetic coil 3, allowing for the formation of a lower temperature zone through the continuous cooling effect of water-cooling element 2. Meanwhile, the portion of heat pipe 1 that contacts electromagnetic coil 3 directly absorbs heat from the coil, forming a high-temperature zone. This increases the temperature gradient across heat pipe 1, further enhancing the vapor pressure difference between the evaporation and condensation sections, accelerating the circulation speed of the working fluid within heat pipe 1, and thus improving the heat exchange efficiency of the heat dissipation device. This is particularly suitable for scenarios where electromagnetic coil 3 generates a large amount of heat and requires a high heat dissipation rate. In the second embodiment, referring to… Figure 3 The axial length of heat pipe 1 matches the axial length of electromagnetic coil 3, and the two end faces of heat pipe 1 are flush with the two end faces of electromagnetic coil 3. The axial length of water-cooling element 2 is shorter than that of heat pipe 1, and the end face of water-cooling element 2 away from plug 35 is flush with the end face of heat pipe 1 away from plug 35, forming a structure in which heat pipe 1 is not completely covered by water-cooling element 2. In this embodiment, heat pipe 1 does not extend beyond electromagnetic coil 3, and will not form an additional protruding structure. This avoids spatial interference with other components around electromagnetic coil 3 (such as in multi-coil application scenarios), and there is no need to reserve additional assembly space to avoid heat pipe 1. The original installation layout and spatial design can be directly used, resulting in low cost of technology implementation and high scenario adaptability.

[0032] To further improve the heat transfer efficiency between the electromagnetic coil 3 and the heat pipe 1, and between the heat pipe 1 and the water-cooling element 2, thermally conductive silicone grease 7 is applied to the contact surface between the inner cylindrical wall 11 and the electromagnetic coil 3, and thermally conductive silicone grease 7 is applied to the contact surface between the outer cylindrical wall 12 and the water-cooling element 2.

[0033] Reference Figure 1 , Figure 4The water-cooled element 2 includes an inlet port 21, an outlet port 22, and a circulating water channel. The inlet port 21 and the outlet port 22 are detachably connected to both ends of the circulating water channel. Cooling water circulates through the inlet port 21 and the outlet port 22 in the circulating water channel, continuously carrying away heat and thus reducing the temperature of the heat pipe 1. To further improve heat dissipation efficiency, multiple annular ribs 6 are evenly spaced within the circulating water channel, dividing the circulating water channel into multiple annular water channels 23. After a single circulating water channel is divided into multiple annular water channels 23, the cooling water diameter decreases and the flow velocity increases, the Reynolds number Re increases significantly, it is easier to enter a turbulent state, the convective heat transfer coefficient increases greatly, and the heat transfer efficiency is significantly improved. Furthermore, the two ends of the circulating water channel are respectively provided with an inlet bend 9 and an outlet bend 10, which are integrally formed with the circulating water channel. A clamping port 110 is formed between the inlet bend 9 and the outlet bend 10 to clamp and cooperate with the heat pipe 1. The inner diameter of the circulating water channel is slightly smaller than the outer diameter of the heat pipe 1. During assembly, the inlet bend 9 and the outlet bend 10 are opened outward by external force, which can make the circulating water channel slightly open to accommodate the heat pipe 1. After the external force is removed, the clamping port 110 tightens inward, thereby forming a stable radial clamping force on the heat pipe 1, ensuring that the water-cooling element 2 and the outer peripheral wall of the heat pipe 1 always remain in close contact, avoiding gaps caused by vibration, and thus ensuring the stability of heat transfer.

[0034] The electromagnetic coil 3 includes a frame 31, a winding 32, a plastic coating layer 33, a bracket 34, and a plug 35. The frame 31 has an overall "I" shape. The winding 32 surrounds the frame 31 and is embedded in the annular grooves formed on both sides of the frame 31. The outer sides of the frame 31 and the winding 32 are integrally formed with a plastic coating layer 33 using a plastic coating process. The plastic coating layer 33 completely covers the non-assembly surfaces of the winding 32 and the frame 31. The bracket 34 is arranged around the periphery of the plastic coating layer 33. The plug 35 is a conductive connection component. One end of it is electrically connected to the winding 32, and the other end extends outward along one radial side of the plastic coating layer 33 for connecting to an external circuit. A clearance notch 8 is provided at one axial end of the heat pipe 1 corresponding to the position of the plug 35. The shape and size of the clearance notch 8 are adapted to the shape of the plug 35, and the depth of the notch is such that when the heat pipe 1 is fitted around the outer periphery of the electromagnetic coil 3, it can form a snap-fit ​​engagement with the plug 35 through the clearance notch 8, allowing the heat pipe 1 to bypass the plug and be flush with the corresponding end face of the electromagnetic coil 3. The setting of the clearance notch 8 eliminates the spatial interference of the plug on the assembly of the heat pipe 1, allowing the heat pipe 1 to circumferentially surround the entire axial length of the electromagnetic coil 3, maximizing the contact area between the heat pipe 1 and the electromagnetic coil 3, that is, maximizing the heat dissipation area, thereby improving the heat transfer efficiency. At the same time, the clearance notch 8 can limit the displacement of the heat pipe 1 along the radial direction of the electromagnetic coil 3 and the axial direction toward the electromagnetic coil 3, ensuring the stability of the heat dissipation structure.

[0035] The working principle of this utility model is as follows: After the electromagnetic coil 3 is connected to the power supply through the plug 35, the current flows in the winding 32. Part of the electrical energy is converted into magnetic field energy, and part of the electrical energy is converted into heat energy due to the Joule effect and released outward. The heat is first transferred to the plastic coating layer 33 in contact with the winding 32, and then through the support 34 surrounding the plastic coating layer 33. The heat is transferred to the evaporation section of the heat pipe 1 through the thermally conductive silicone grease 7 between the support 34 and the inner cylindrical wall 11 of the heat pipe 1. The heat transfer medium in the evaporation section absorbs heat and evaporates into steam. The steam flows to the condensation section under the action of pressure difference and releases heat. The heat is then transferred to the water cooling element 2 through the outer cylindrical wall 12 and the thermally conductive silicone grease 7 between the outer cylindrical wall 12 and the water cooling element 2. Finally, it is carried away by the circulating coolant in the water cooling element 2, thereby realizing the heat dissipation of the electromagnetic coil 3.

[0036] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A heat dissipation device for an electromagnetic coil, characterized in that: The device includes a heat pipe (1) and a water-cooling element (2). The heat pipe (1) includes an inner cylindrical wall (11), an outer cylindrical wall (12), and an end wall. The end wall is located at both ends of the inner cylindrical wall (11) and the outer cylindrical wall (12) and is used to close the inner cylindrical wall (11) and the outer cylindrical wall (12). An annular cavity (13) for accommodating the heat transfer medium is formed between the inner cylindrical wall (11), the outer cylindrical wall (12), and the end wall. The heat pipe (1) is sleeved on the outside of the electromagnetic coil (3), and the inner cylindrical wall (11) is in close contact with the outer surface of the electromagnetic coil (3). The water-cooling element (2) is sleeved on the outside of the heat pipe (1), and the water-cooling element (2) is in close contact with the outer cylindrical wall (12).

2. The heat dissipation device for an electromagnetic coil according to claim 1, characterized in that: The inner wall of the annular cavity (13) is provided with a capillary core (4). The capillary core (4) is made of copper powder and attached to the inner wall of the annular cavity (13) by high-temperature sintering. The capillary core (4) is continuously distributed along the circumference of the heat pipe (1) and continuously covers the inner wall of the annular cavity (13) along the axial direction of the heat pipe (1).

3. The heat dissipation device for an electromagnetic coil according to claim 2, characterized in that: The annular cavity (13) is provided with support members (5) evenly spaced inside. The inner wall of the support member (5) abuts against the inner cylindrical wall (11), and the outer wall of the support member (5) abuts against the outer cylindrical wall (12).

4. The heat dissipation device for an electromagnetic coil according to claim 3, characterized in that: One end of the heat pipe (1) extends out of the electromagnetic coil (3), and the water-cooling element (2) is sleeved on the outer peripheral wall of the part of the heat pipe (1) that extends out of the electromagnetic coil (3).

5. A heat dissipation device for an electromagnetic coil according to claim 4, characterized in that: The heat pipe (1) is made of copper-aluminum composite material.

6. A heat dissipation device for an electromagnetic coil according to claim 5, characterized in that: The water-cooling element (2) includes an inlet port (21), an outlet port (22), and a circulating water channel. The circulating water channel is sleeved outside the heat pipe (1). The inlet port (21) and the outlet port (22) are detachably connected to both ends of the circulating water channel. Cooling water circulates in the circulating water channel through the inlet port (21) and the outlet port (22).

7. A heat dissipation device for an electromagnetic coil according to claim 6, characterized in that: The circulating water channel is provided with multiple ribs (6) evenly spaced, and the ribs (6) divide the circulating water channel into multiple annular water channels (23).

8. A heat dissipation device for an electromagnetic coil according to claim 7, characterized in that: The inner cylindrical wall (11) and the electromagnetic coil (3) are coated with thermally conductive silicone grease (7); the outer cylindrical wall (12) and the water-cooling element (2) are coated with thermally conductive silicone grease (7).

9. A heat dissipation device for an electromagnetic coil according to claim 8, characterized in that: The two ends of the circulating water channel are respectively provided with an inlet turning bend (9) and an outlet turning bend (10). The inlet turning bend (9) and the outlet turning bend (10) are integrally formed with the circulating water channel. A clamping port (110) is formed between the inlet turning bend (9) and the outlet turning bend (10) to clamp and cooperate with the heat pipe (1). The inlet interface (21) and the outlet interface (22) are detachably connected to the inlet turning bend (9) and the outlet turning bend (10) respectively.

10. A heat dissipation device for an electromagnetic coil according to claim 9, characterized in that: The electromagnetic coil (3) includes a frame (31), a winding (32), a plastic coating layer (33), a bracket (34), and a plug (35). The winding (32) is wound around the frame (31). The frame (31) and the outer side of the winding (32) are coated to form a plastic coating layer (33). The plug (35) extends along one radial side of the plastic coating layer (33). The bracket (34) surrounds the periphery of the plastic coating layer (33). The heat pipe (1) has a clearance notch (8), which engages with the plug (35).

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