Electromagnetic coil and electromagnetic valve

Abstract

The utility model discloses an electromagnetic coil and an electromagnetic valve, and relates to the technical field of electromagnetic valves. The electromagnetic coil comprises a shell, a coil body and a vapor chamber, wherein the coil body is arranged in the shell; the vapor chamber is arranged outside the coil body and comprises a heat absorption part for absorbing heat for the coil body and a heat release part for releasing heat in the direction far away from the coil body in the radial direction of the coil body. According to the electromagnetic coil, the increased temperature of the coil body can be reduced, stable performance of the electromagnetic coil is guaranteed, and the electromagnetic valve can be normally used.

Description

Technical Field

[0001] The utility model relates to the technical field of solenoid valves, in particular to an electromagnetic coil and a solenoid valve. Background Art

[0002] A solenoid valve is an industrial device controlled by electricity magnetism. It is a basic automation component for controlling fluids and belongs to an actuator. It is not limited to hydraulic and pneumatic applications. Solenoid valves are mainly used to adjust the direction, flow rate, speed and other parameters of the medium in industrial control systems.

[0003] In the prior art, the solenoid valve mainly controls or adjusts the opening degree of the solenoid valve by controlling the current in the electromagnetic coil. According to Joule's law, during the energization process, the electromagnetic coil generates heat, resulting in an increase in the temperature of the electromagnetic coil. As a result, the resistance value of the electromagnetic coil increases and the current decreases, leading to a reduction in the performance of the electromagnetic coil and affecting the normal use of the solenoid valve. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an electromagnetic coil and a solenoid valve, which can reduce the temperature rise of the coil body, ensure the stable performance of the electromagnetic coil, and enable the solenoid valve to be used normally.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] An electromagnetic coil, comprising:

[0007] A housing;

[0008] A coil body, which is arranged inside the housing;

[0009] A heat pipe, which is arranged outside the coil body. Along the radial direction of the coil body, the heat pipe includes a heat absorption part for absorbing heat from the coil body and a heat dissipation part for dissipating heat away from the coil body.

[0010] As an alternative embodiment of the above electromagnetic coil, the heat pipe includes a heat-conducting shell, a vacuum chamber is arranged inside the heat-conducting shell, a flow guide layer and a heat exchange medium are arranged inside the vacuum chamber, the flow guide layer is in contact with the heat absorption part, and the heat exchange medium can flow towards the heat absorption part under the guiding action of the flow guide layer.

[0011] As an alternative embodiment of the above electromagnetic coil, the flow guide layer is a porous structure, so that the heat exchange medium flows towards the heat absorption part under capillary action.

[0012] As an alternative embodiment of the above electromagnetic coil, the flow guide layer includes a first flow guide part and a second flow guide part, the first flow guide part is in contact with the heat absorption part, and the second flow guide part is in contact with the heat dissipation part.

[0013] As an alternative to the above electromagnetic coil, along the radial direction of the coil body, the heat absorption part of the heat sink is in contact with the coil body.

[0014] As an alternative to the above electromagnetic coil, the electromagnetic coil further includes a plastic encapsulation layer, which is arranged between the coil body and the housing to fix the coil body, and the heat sink is arranged on the plastic encapsulation layer.

[0015] As an alternative to the above electromagnetic coil, the outer surface of the housing is provided with heat dissipation fins, and along the radial direction of the coil body, the projection of the heat dissipation fins on the housing overlaps with the projection of the heat sink on the housing.

[0016] As an alternative to the above electromagnetic coil, along the radial direction of the coil body, the projection of the heat dissipation fins on the housing covers the projection of the heat sink on the housing.

[0017] As an alternative to the above electromagnetic coil, the outer surface of the housing is provided with multiple groups of heat dissipation fins, and the multiple groups of heat dissipation structures are arranged on the housing at intervals along the circumferential direction of the housing. Along the radial direction of the coil body, the projections of the multiple groups of heat dissipation fins on the housing all overlap with the projection of the heat sink on the housing.

[0018] A solenoid valve, the solenoid valve includes the electromagnetic coil according to any one of the above, and further includes a valve body, a valve core and an armature. The electromagnetic coil is arranged on the valve body, the valve core is movably arranged in the valve body, and the electromagnetic coil can drive the valve core to move through the armature.

[0019] Advantages of the present utility model:

[0020] The present utility model provides an electromagnetic coil and a solenoid valve. In this electromagnetic coil, a heat sink is provided outside the coil body. The heat sink can quickly conduct the heat generated by the coil body to the outside of the electromagnetic coil through the phase change of the internal heat exchange medium, realizing efficient heat dissipation, thereby reducing the temperature rise of the coil body, ensuring the stable performance of the electromagnetic coil, and enabling the solenoid valve to be used normally. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of the electromagnetic coil provided by the present utility model Figure 1 ;

[0022] Figure 2 is an axial sectional view of the electromagnetic coil provided by the present utility model;

[0023] Figure 3 is Figure 2 a partial enlarged view of part A in

[0024] Figure 4 is a schematic structural view of the plastic encapsulation layer provided by the present utility model;

[0025] Figure 5 is a schematic structural view of the relative positions of the heat pipe and the heat dissipation fins provided by the present utility model;

[0026] Figure 6 is a schematic structural view of the electromagnetic coil provided by the present utility model Figure 2 ;

[0027] Figure 7 is a schematic structural view of the relative positions of the heat pipe and the heat dissipation fins provided by the present utility model Figure 2 .

[0028] In the figure:

[0029] 1. Outer shell; 11. Heat dissipation fins;

[0030] 2. Coil body;

[0031] 3. Heat pipe; 31. Heat absorption part; 32. Heat release part; 33. Heat conduction housing; 331. Vacuum chamber; 34. Flow guiding layer; 341. First flow guiding part; 342. Second flow guiding part; 343. Connection part;

[0032] 4. Plastic encapsulation layer; 41. Fixing hole; 42. Slot; 43. Insertion part;

[0033] 5. Skeleton. Detailed implementation manners

[0034] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model, and should not be construed as limiting the present utility model.

[0035] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0036] Unless otherwise clearly defined and limited, the terms "installation", "connection", "linkage", and "fixation" shall be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0037] Unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include direct contact between the first feature and the second feature, or may include the situation where the first feature and the second feature are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0038] The technical solution of the present utility model will be further described below in conjunction with the drawings and through specific embodiments.

[0039] This embodiment provides a solenoid valve, which includes a valve body and a valve core. The valve body includes a water inlet and a water outlet that are communicated with each other. The valve core is movably arranged in the valve body to block or open the passage between the water inlet and the water outlet.

[0040] For the convenience of control, the solenoid valve further includes an electromagnetic coil and an armature. The electromagnetic coil is arranged on the valve body, and the electromagnetic coil can drive the valve stem to move through the armature. The working principle of the electromagnetic coil is that when the electromagnetic coil is energized, a magnetic field will be formed around the electromagnetic coil, and the magnitude of the magnetic field will change with the ampere-turns. The generated magnetic field will induce the armature, causing the armature to move. The armature is connected to the valve core through a push rod and serves as a motion mechanism to drive the valve element to open and close.

[0041] After the electromagnetic coil is energized, electrical energy is converted into mechanical energy and heat energy. When the valve core abuts against the valve body and stops moving, almost no electrical energy is converted into heat energy, resulting in problems of large heat generation and high temperature. According to Joule's law, during the energization process, the heat generated by the electromagnetic coil will cause the temperature of the electromagnetic coil to rise, and then the resistance value of the electromagnetic coil will increase. Since the voltage remains unchanged, the current of the electromagnetic coil decreases, resulting in a reduction in the performance of the electromagnetic coil and affecting the normal use of the solenoid valve.

[0042] Such as Figures 1 to 3As shown in the figure, to solve the above problems, this embodiment provides an electromagnetic coil, which includes a housing 1, a coil body 2, and a heat pipe 3. The coil body 2 is disposed inside the housing 1, and the heat pipe 3 is disposed outside the coil body 2. Along the radial direction of the coil body 2, the heat pipe 3 includes a heat absorption portion 31 for absorbing heat from the coil body 2 and a heat dissipation portion 32 for dissipating heat away from the coil body 2.

[0043] In this electromagnetic coil, a heat pipe 3 is provided outside the coil body 2. The heat pipe 3 can quickly conduct the heat generated by the coil body 2 to the outside of the electromagnetic coil through the phase change of the internal heat transfer medium, achieving efficient heat dissipation, thereby reducing the temperature rise of the coil body 2, ensuring the stable performance of the electromagnetic coil, and enabling the solenoid valve to be used normally.

[0044] Among them, the housing 1 is made of a metal material, such as steel, copper, aluminum, etc. In this embodiment, the housing 1 is made of copper, and copper has a high thermal conductivity, which can quickly dissipate heat, thereby improving the heat dissipation efficiency, effectively reducing the temperature of the electromagnetic coil, and ensuring the stable performance of the electromagnetic coil.

[0045] In this embodiment, the heat pipe 3 includes a heat-conducting housing 33. A vacuum chamber 331 is provided inside the heat-conducting housing 33. A flow guide layer 34 and a heat transfer medium are provided inside the vacuum chamber 331. The flow guide layer 34 abuts against the heat absorption portion 31, and the heat transfer medium can flow towards the heat absorption portion 31 under the guiding action of the flow guide layer 34.

[0046] The heat transfer medium is easy to evaporate inside the vacuum chamber 331. When the heat absorption portion 31 absorbs the heat of the coil body 2, it will cause the heat transfer medium in the flow guide layer 34 in contact with the heat absorption portion 31 to absorb heat. At this time, the heat transfer medium that absorbs heat energy evaporates, causing the volume to expand rapidly. The gaseous heat transfer medium quickly fills the entire vacuum chamber 331. When the gaseous heat transfer medium contacts the relatively low-temperature heat dissipation portion 32, condensation will occur, and heat will be released simultaneously, causing the heat to be transferred from the heat dissipation portion 32 to the housing 1 to achieve heat dissipation. The condensed and liquefied heat transfer medium will contact the flow guide layer 34 and re-flow to the heat absorption portion 31 under the guiding action of the flow guide layer 34 to form a cycle.

[0047] On the one hand, the heat pipe 3 can achieve efficient heat conduction through the phase change of the heat transfer medium. On the other hand, the heat pipe 3 can also evenly disperse the heat over a larger area, thereby increasing the heat dissipation area. Among them, the heat absorption portion 31 of the heat pipe 3 is one surface on one side in the thickness direction of the heat pipe 3, and the heat dissipation portion 32 of the heat pipe 3 is the other surface on the other side in the thickness direction of the heat pipe 3.

[0048] Among them, the heat transfer medium can be water, ethylene glycol, etc., which can be selected according to the actual temperature of the usage environment of the heat pipe 3. The vacuum degree of the vacuum chamber 331 can also be selected according to the actual situation, which will not be elaborated here.

[0049] In this embodiment, the diversion layer 34 has a porous structure, enabling the heat exchange medium to flow towards the heat absorption part 31 under capillary action. When the gaseous heat exchange medium contacts the heat release part 32 and condenses, it will flow and contact the diversion layer 34. Since the heat exchange medium in the part of the diversion layer 34 in contact with the heat absorption part 31 continuously evaporates, the liquid-phase heat exchange medium will flow to the heat absorption part 31.

[0050] Specifically, the diversion layer 34 can be formed by powder sintering, or can be a metal film or a multi-layer metal mesh, etc. The above structures all have a large number of micropores, thus generating capillary action on the heat exchange medium, enabling the heat exchange medium condensed at the heat release part 32 to flow to the heat absorption part 31 and form a cycle. Preferably, the diversion layer 34 is made of a multi-layer copper mesh. The material of the diversion layer 34 is the same as that of the outer shell 1, and no microstructural blockage will occur during the bonding process. The manufactured heat pipe 3 has better quality and a longer service life. And the structure of the multi-layer copper mesh is convenient for controlling the consistency of the pore diameter, and the quality is relatively stable. Higher consistency can make the liquid flow more smoothly, and then can greatly reduce the thickness of the micro-structure and reduce the thickness of the heat pipe 3.

[0051] As Figure 3 shown, the diversion layer 34 includes a first diversion part 341 and a second diversion part 342. The first diversion part 341 abuts against the heat absorption part 31, and the second diversion part 342 abuts against the heat release part 32. The heat exchange medium evaporates in the first diversion part 341 due to the heat of the heat absorption part 31 and condenses while releasing heat in the second diversion part 342. The arrangement of the first diversion part 341 and the second diversion part 342 enables there to be no large amount of liquid-phase heat exchange medium in the vacuum chamber 331, avoiding the generation of noise and also avoiding a large amount of liquid-phase heat exchange medium from increasing the amplitude when the electromagnetic coil vibrates.

[0052] In order to enable the heat exchange medium liquefied in the second diversion part 342 to flow to the first diversion part 341, the diversion layer 34 further includes a connecting part 343. The connecting part 343 is configured to connect the first diversion part 341 and the second diversion part 342 and enable the heat exchange medium in the second diversion part 342 to flow towards the first diversion part 341 under capillary action.

[0053] In this embodiment, the diversion layer 34 covers the inner wall of the outer shell 1. Therefore, the surface of the diversion layer 34 attached to the heat absorption part 31 forms the first diversion part 341, the surface of the diversion layer 34 attached to the heat release part 32 forms the second diversion part 342, and the part of the diversion layer 34 attached to the inner wall between the heat absorption part 31 and the heat release part 32 forms the connecting part 343.

[0054] In this embodiment, along the radial direction of the coil body 2, the heat absorption part 31 of the heat sink plate 3 is in contact with the coil body 2 to improve the heat exchange efficiency between the coil body 2 and the heat absorption part 31 of the heat sink plate 3, ensuring that the heat generated by the coil body 2 can be quickly transferred to the heat sink plate 3.

[0055] As Figure 2 and Figure 3 shown, the electromagnetic coil further includes a bobbin 5, and the coil body 2 is wound around the bobbin 5. In order to fix the coil body 2, the electromagnetic coil further includes a plastic sealing layer 4, and the plastic sealing layer 4 is arranged between the coil body 2 and the outer shell 1 to fix the coil body 2. The plastic sealing layer 4 can fill the gap between the bobbin 5, the coil body 2 and the outer shell 1, making the coil body 2 more stable.

[0056] Furthermore, the plastic sealing layer 4 is provided with a slot 42, and a plug-in part 43 is arranged in the slot 42. The plug-in part 43 is electrically connected to the coil body 2, and the plug-in part 43 is in plug-in fit with the power cord, so that the coil body 2 can be powered on.

[0057] In this embodiment, the heat sink plate 3 is arranged on the plastic sealing layer 4, so that the heat sink plate 3 can be in contact with the coil body 2, thereby quickly conducting the heat generated by the coil body 2 to the outside of the electromagnetic coil.

[0058] As Figure 4 shown, the plastic sealing layer 4 is provided with a fixing hole 41, the heat sink plate 3 is arranged in the fixing hole 41, the heat absorption part 31 of the heat sink plate 3 is in contact with the coil body 2, and the heat dissipation part 32 of the heat sink plate 3 is in contact with the outer shell 1.

[0059] In some embodiments, the heat sink plate 3 can also be arranged on the outer shell 1. A fixing groove is formed on the inner surface of the outer shell 1, the heat sink plate 3 is arranged in the fixing groove, the heat absorption part 31 of the heat sink plate 3 is in contact with the plastic sealing layer 4, and the heat dissipation part 32 of the heat sink plate 3 is in contact with the outer shell 1.

[0060] In this embodiment, in order to improve the heat dissipation capacity of the outer shell 1, a heat dissipation structure is arranged on the outer surface of the outer shell 1, and the heat dissipation structure can increase the heat dissipation area of the outer shell 1. As Figure 1 and Figure 5 shown, the heat dissipation structure includes a plurality of heat dissipation fins 11 arranged at intervals along the axial direction of the coil body 2. The heat dissipation fins 11 can increase the heat dissipation area of the outer shell 1, thereby improving the heat dissipation capacity of the shell and enhancing the heat dissipation effect.

[0061] In some embodiments, the heat dissipation structure includes a plurality of heat dissipation grooves arranged at intervals along the circumferential direction of the coil body 2. The heat dissipation grooves can increase the surface area of the outer shell 1, thereby increasing the heat dissipation area of the outer shell 1, improving the heat dissipation capacity of the shell and enhancing the heat dissipation effect. Moreover, the arrangement of the heat dissipation grooves can avoid expanding the occupied space of the shell and facilitate installation.

[0062] Among them, both the heat dissipation fins 11 and the heat dissipation grooves extend along the circumferential direction of the coil body 2 to further increase the heat dissipation area and can effectively dissipate heat from each position of the coil body 2. In this embodiment, the heat dissipation fins 11 or the heat dissipation grooves are zigzag along their respective extension directions, further increasing the heat dissipation area.

[0063] The heat dissipation structure of this embodiment will be described by taking the heat dissipation fins 11 as an example.

[0064] In order to ensure that the heat spreader 3 can conduct heat to the heat dissipation structure to improve the heat dissipation efficiency, along the radial direction of the coil body 2, the projection of the heat dissipation fins 11 on the outer shell 1 intersects with the projection of the heat spreader 3 on the outer shell 1. It can be understood that the heat of the coil body 2 is dissipated radially outward, so the above structure can make the heat spreader 3 located on the heat dissipation path of the coil body 2 to quickly spread the heat to the entire heat spreader 3 and conduct it to the outer shell 1, improving the heat dissipation efficiency.

[0065] In this embodiment, along the radial direction of the coil body 2, the projection of the heat dissipation fins 11 on the outer shell 1 covers the projection of the heat spreader 3 on the outer shell 1. In this structure, the heat hardly needs to be transferred along the circumferential direction of the coil body 2 during the heat transfer process, but only needs to be transferred from the heat spreader 3 to the outer shell 1 along the radial direction of the coil body 2, and the heat propagation path is short, improving the heat dissipation efficiency.

[0066] Such as Figure 6 and Figure 7 shown, multiple groups of heat dissipation fins 11 are arranged on the outer surface of the outer shell 1. The multiple groups of heat dissipation fins 11 are arranged on the outer shell 1 at intervals along the circumferential direction of the outer shell 1. Along the radial direction of the coil body 2, the projections of the multiple groups of heat dissipation fins 11 on the outer shell 1 all intersect with the projection of the heat spreader 3 on the outer shell 1. In this structure, the heat spreader 3 is located on the heat dissipation path of the coil body 2, can quickly spread the heat to the entire heat spreader 3, and the two heat dissipation structures can increase the heat dissipation area of the heat dissipation structure, thereby improving the heat exchange efficiency between the outer shell 1 and the external environment to improve the heat dissipation capacity of the outer shell 1.

[0067] The above content is only the preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. An electromagnetic coil, characterized in that, Comprising: A housing (1); A coil body (2), which is disposed within the housing (1); A heat pipe (3), which is disposed outside the coil body (2). Along the radial direction of the coil body (2), the heat pipe (3) includes a heat absorption portion (31) for absorbing heat from the coil body (2) and a heat dissipation portion (32) for dissipating heat away from the coil body (2).

2. The electromagnetic coil according to claim 1, characterized in that, The heat pipe (3) includes a heat-conducting housing (33). A vacuum chamber (331) is provided within the heat-conducting housing (33). A flow guide layer (34) and a heat exchange medium are provided within the vacuum chamber (331). The flow guide layer (34) abuts against the heat absorption portion (31), and the heat exchange medium can flow towards the heat absorption portion (31) under the guiding action of the flow guide layer (34).

3. The electromagnetic coil according to claim 2, wherein, The flow guide layer (34) has a porous structure so that the heat exchange medium flows towards the heat absorption portion (31) under capillary action.

4. The electromagnetic coil according to claim 2, wherein, The flow guide layer (34) includes a first flow guide portion (341) and a second flow guide portion (342). The first flow guide portion (341) abuts against the heat absorption portion (31), and the second flow guide portion (342) abuts against the heat dissipation portion (32).

5. The electromagnetic coil according to claim 1, wherein Along the radial direction of the coil body (2), the heat absorption portion (31) of the heat pipe (3) abuts against the coil body (2).

6. The electromagnetic coil according to claim 5, characterized in that, The electromagnetic coil further includes a plastic encapsulation layer (4), which is disposed between the coil body (2) and the housing (1) to fix the coil body (2), and the heat pipe (3) is disposed on the plastic encapsulation layer (4).

7. The electromagnetic coil according to any one of claims 1 to 6, characterized in that, Heat dissipation fins (11) are provided on the outer surface of the housing (1). Along the radial direction of the coil body (2), the projection of the heat dissipation fins (11) on the housing (1) overlaps with the projection of the heat pipe (3) on the housing (1).

8. The electromagnetic coil according to claim 7, characterized in that, Along the radial direction of the coil body (2), the projection of the heat dissipation fins (11) on the housing (1) covers the projection of the heat pipe (3) on the housing (1).

9. The electromagnetic coil according to claim 7, wherein, Multiple groups of heat dissipation fins (11) are provided on the outer surface of the housing (1). The multiple groups of heat dissipation fins are arranged on the housing (1) at intervals along the circumferential direction of the housing (1). Along the radial direction of the coil body (2), the projections of the multiple groups of heat dissipation fins (11) on the housing (1) all overlap with the projection of the heat pipe (3) on the housing (1).

10. A solenoid valve, characterized in that, The solenoid valve includes the electromagnetic coil according to any one of claims 1 to 9, and further includes a valve body, a valve core, and an armature. The electromagnetic coil is disposed on the valve body. The valve core is movably disposed within the valve body, and the electromagnetic coil can drive the valve core to move through the armature.

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