Air-cooled magnetic field press electromagnet and magnetic field press

Abstract

The utility model relates to the technical field of magnetic field pressing machines, in particular to an air-cooled magnetic field pressing machine electromagnet and a magnetic field pressing machine, and mainly solves the technical problems of easy leakage and large leakage loss of a cooling mode of an existing magnetic field pressing machine electromagnet. The electromagnet comprises a shell assembly, the shell assembly comprises a coil support and a sealing shell, a closed annular cavity is formed between the coil support and the sealing shell, and an air inlet and an air outlet which communicate with the annular cavity are formed in the sealing shell; the magnetic field pole is coaxially fixed in the coil bracket; the coil assembly is located in the annular cavity and arranged on the coil support in a sleeving mode. The heat conducting plates are of an annular structure and are arranged on the coil support in a sleeving mode, and the multiple heat conducting plates are located between every two adjacent sets of coils and located on the two end faces of the coil assembly respectively; and the plurality of heat dissipation fins are respectively positioned between every two adjacent heat conduction plates. The cooling medium of the structure is air or inert gas, the leakage probability is low, leakage loss and harm are small, the overall structure is simple, and the manufacturing cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic field presses, in particular to an air-cooled magnetic field press electromagnet and a magnetic field press. Background Art

[0002] Orientation molding is an important step in the processing of magnetic materials such as NdFeB and SmCo. During orientation molding, a magnetic field press is required. The electromagnets of the magnetic poles are excited by current to generate a magnetic field to orient the magnetic powder particles in the mold, and at the same time apply pressure to press the magnetic powder into the target shape. The electromagnets will generate heat during repeated orientation and demagnetization operations, and the resistance of the coil will increase with the increase in temperature, resulting in a decrease in the magnetizing current and a decrease in the magnetic field, which in turn affects the orientation of the molded product; at the same time, the coils work at high temperatures for a long time, and the insulation layer is more likely to age, thus affecting its service life. Therefore, electromagnets used in industrial production must be cooled.

[0003] There are two common cooling methods for the existing magnetic field press electromagnets: water cooling and oil cooling. Water cooling is to cool the coil and the pole by welding a copper tube on the heat conduction plate and passing cooling water; oil cooling is to immerse the coil in insulating grease, circulate the grease through a circulating pump, and use a heat exchange device and cooling water for heat exchange to achieve cooling. However, after 3-5 years of use, both water cooling and oil cooling have problems with aging of sealing components and clogging of pipes, which affects the cooling effect or causes leakage. In addition, once water and oil media leak into the interior of the equipment, the cleaning cost is high, and it will also cause damage to raw materials and electrical accessories. Therefore, once a leak occurs, the machine must be shut down for replacement. The cost of shutdown and replacement is high, the downtime is long, and the production progress is affected. Utility Model Content

[0004] In order to overcome the technical defects of easy leakage and large leakage loss in the existing magnetic field press electromagnet cooling method, the utility model provides an air-cooled magnetic field press electromagnet and a magnetic field press.

[0005] The utility model provides an air-cooled magnetic field press electromagnet, comprising:

[0006] A housing assembly, comprising a coil support and a sealing shell, wherein the coil support is a cylindrical structure and is located in the middle of the sealing shell, a closed annular cavity is formed between the coil support and the sealing shell, and an air inlet and an air outlet connected to the annular cavity are provided on the sealing shell;

[0007] A magnetic field pole, which is coaxially fixed inside the coil support and has one end extending outward from the coil support;

[0008] A coil assembly is located in the annular cavity and is sleeved on the coil support. The coil assembly is provided in multiple groups and is distributed along the axial direction of the coil support.

[0009] A heat conducting plate, which is an annular structure and is mounted on the coil support. A plurality of heat conducting plates are provided and are respectively located between each two adjacent groups of coils and at both end surfaces of the coil assembly;

[0010] A plurality of heat dissipation fins are provided and are respectively located between each two adjacent heat conducting plates.

[0011] Furthermore, the heat conducting plate and the heat dissipating fins are bonded and fixed by thermally conductive silicone.

[0012] Furthermore, a ventilation gap is reserved between the heat dissipation fins and the corresponding group of coils.

[0013] Furthermore, both the air inlet and the air outlet are provided with an axial flow fan, and the axial flow fan is used to guide the air to enter the air inlet or to exit the air at the air outlet.

[0014] Furthermore, the axis of the coil support is arranged horizontally, the air inlet is connected to the bottom of the annular cavity, and the air outlet is connected to the top of the annular cavity.

[0015] Furthermore, the sealing shell includes a fixing plate and a sealing cover, and the fixing plate, the sealing cover and the coil support together form the annular cavity, and one end of the magnetic field pole facing the sealing cover extends outward from the coil support.

[0016] Furthermore, the fixing plate is provided with a through hole corresponding to the coil bracket, and a mounting cover is fixed on the plate surface of the fixing plate away from the sealing cover, the interior of the mounting cover and the interior of the coil bracket together form a columnar cavity, and an adjusting member is provided on the mounting cover, and the adjusting member is connected to the magnetic field pole and is used to adjust the axial position of the magnetic field pole in the columnar cavity.

[0017] Furthermore, the columnar cavity and the magnetic field pole are both cylindrical, and the adjusting member is an adjusting screw screwed on the mounting cover, and the adjusting screw is coaxial with the magnetic field pole and fixedly connected.

[0018] The magnetic field press provided by the utility model comprises a frame, on which the aforementioned air-cooled magnetic field press electromagnet is fixed.

[0019] Furthermore, the frame includes a left vertical plate and a right vertical plate, the inner sides of the left vertical plate and the right vertical plate are both provided with the air-cooled magnetic field press electromagnet, and the extended ends of the magnetic field poles of the two air-cooled magnetic field press electromagnets are arranged relative to each other.

[0020] Compared with the prior art, the technical solution provided by the utility model has the following advantages:

[0021] The air-cooled magnetic field press electromagnet provided by the utility model places the coil assembly in a closed annular cavity, and a heat conduction plate is provided between each two adjacent groups of coils and on both end surfaces of the coil assembly, a heat dissipation fin is provided between each two adjacent heat conduction plates, and the annular cavity is provided with an air inlet and an air outlet. When in use, an air flow is formed in the annular cavity through the air inlet and the air outlet, and the flowing wind takes away the heat on the coil through the heat dissipation fins and the heat conduction plate in turn, thereby realizing air-cooled heat dissipation. Compared with the existing water-cooled and oil-cooled heat dissipation, this structure has a pressure-free pneumatic seal, a simple and reliable structure, and a low cost; the cooling medium is air or an inert gas, the leakage probability is low, and the leakage loss and harm are small, and after 3-5 years of use, if a leakage problem occurs, the circulating cooling gas can be replaced with an inert gas, which can further reduce the harm of leakage to the internal structure of the equipment, and at the same time, it can be replaced according to the appropriate equipment maintenance cycle allocated according to production, without affecting the normal production progress.

[0022] The magnetic field press provided by the utility model has the above-mentioned advantages because it has the above-mentioned air-cooled magnetic field press electromagnet. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A cross-sectional view showing an air-cooled magnetic field press electromagnet in an embodiment of the utility model;

[0026] Figure 2 A schematic structural diagram of a magnetic field press in an embodiment of the utility model is shown.

[0027] In the figure:

[0028] 1. Shell assembly; 11. Coil bracket; 12. Sealing shell; 121. Fixing plate; 122. Sealing cover; 13. Annular cavity; 14. Air inlet; 15. Air outlet; 2. Magnetic field pole; 3. Coil assembly; 4. Heat conduction plate; 5. Heat dissipation fins; 6. Mounting cover; 7. Columnar cavity; 8. Adjustment part; 100. Left vertical plate; 200. Right vertical plate. DETAILED DESCRIPTION

[0029] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the scheme of the utility model will be further described below. It should be noted that the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

[0030] In the description, it should be noted that the terms "first" and "second" are only used for descriptive purposes and should not be understood as indicating or implying relative importance. It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0032] The specific embodiments of the present utility model are described in detail below with reference to the accompanying drawings. Example 1

[0033] Reference Figure 1 The present embodiment provides an air-cooled magnetic field press electromagnet, comprising a housing assembly 1, a magnetic field pole 2, a coil assembly 3, a heat conducting plate 4 and a heat dissipation fin 5.

[0034] Shell component 1

[0035] The shell assembly 1 includes a coil bracket 11 and a sealing shell 12. The coil bracket 11 is a cylindrical structure and is located in the middle of the sealing shell 12. A closed annular cavity 13 is formed between the coil bracket 11 and the sealing shell 12. The sealing shell 12 is provided with an air inlet 14 and an air outlet 15 connected to the annular cavity 13.

[0036] Specifically, the inner ring of the annular cavity 13 is circular, and the outer ring is polygonal; in actual use, the inner ring shape of the annular cavity 13 can be adapted to the magnetic field pole 2, and the outer ring shape of the annular cavity 13 can be adaptively selected according to factors such as spatial layout.

[0037] Specifically, the sealing shell 12 includes a fixing plate 121 and a sealing cover 122. The fixing plate 121, the sealing cover 122 and the coil support 11 together form an annular cavity 13. In actual use, the fixing plate 121 is independently provided or uses the inherent frame structure of the magnetic field press.

[0038] It should be noted that, in order to ensure the sealing of the annular cavity 13 , in this embodiment, a sealing ring is provided between the sealing cover 122 and the coil support 11 , and a sealing gasket is provided between the sealing cover 122 and the fixing plate 121 .

[0039] Furthermore, a through hole is provided in the fixing plate 121 corresponding to the coil support 11, and a mounting cover 6 is fixed on the plate surface of the fixing plate 121 away from the sealing cover 122, and the interior of the mounting cover 6 and the interior of the coil support 11 together form a columnar cavity 7, and an adjusting member 8 is provided on the mounting cover 6, and the adjusting member 8 is connected to the magnetic field pole 2 and is used to adjust the axial position of the magnetic field pole 2 in the columnar cavity 7. When in use, the axial position of the magnetic field pole 2 in the columnar cavity 7 can be adjusted by the adjusting member 8, so as to better meet the actual process requirements.

[0040] Specifically, the columnar cavity 7 and the magnetic field pole 2 are both cylindrical, and the adjusting member 8 is an adjusting screw screwed on the mounting cover 6, which is coaxial and fixedly connected with the magnetic field pole 2. The magnetic field pole 2 is rotated and moved axially by screwing the adjusting screw.

[0041] It should be noted that the magnetic field pole 2 can also be a prism. When the adjusting member 8 still adopts an adjusting screw, it is only necessary to hinge the end of the adjusting screw with the magnetic field pole 2. In this way, when the adjusting screw is screwed, the magnetic field pole 2 only moves axially.

[0042] Furthermore, both the air inlet 14 and the air outlet 15 are provided with an axial flow fan, which is used to guide air in through the air inlet 14 or out through the air outlet 15. The axial flow fan can increase the air flow rate, thereby increasing the heat exchange rate and further improving the heat dissipation efficiency.

[0043] It is easy to understand that the axial flow fan structures of the air inlet 14 and the air outlet 15 can be selected to be the same. It is only necessary to control the rotation directions of the two axial flow fans in opposite directions to guide the air inlet 14 to enter or the air outlet 15 to discharge.

[0044] Specifically, the axis of the coil support 11 is arranged horizontally, the air inlet 14 is connected to the bottom of the annular cavity 13, and the air outlet 15 is connected to the top of the annular cavity 13. Since the air density is small, it has a tendency to float up in a natural state, so the air inlet 14 is designed at the bottom and the air outlet 15 is designed at the top, which can better match the flow path of natural wind, so as to ensure the heat dissipation efficiency.

[0045] Magnetic field pole 2

[0046] The magnetic field pole 2 is coaxially fixed inside the coil support 11 and one end thereof extends outward from the coil support 11 .

[0047] Specifically, the magnetic field pole 2 is cylindrical. In actual use, the magnetic field pole 2 can also be set to a prism or other shapes as needed.

[0048] Specifically, one end of the magnetic field pole 2 facing the sealing cover 122 protrudes out of the coil support 11 .

[0049] Coil assembly 3

[0050] The coil assembly 3 is located in the annular cavity 13 and is sleeved on the coil support 11 . The coil assembly 3 is provided in multiple groups and is distributed along the axial direction of the coil support 11 .

[0051] It is easy to understand that when in use, a direct current is provided to the coil assembly 3 through the excitation circuit to generate a magnetic field to magnetize the mold and material in the working area.

[0052] Heat conducting plate 4

[0053] The heat conducting plate 4 is an annular structure and is sleeved on the coil support 11 . A plurality of heat conducting plates 4 are provided and are respectively located between each two adjacent groups of coils and at both end surfaces of the coil assembly 3 .

[0054] It is easy to understand that the number of the heat conducting plates 4 is one more than the number of the coil groups, so that the heat conducting plates 4 can be located between every two adjacent coil groups and at both end surfaces of the coil assembly 3 .

[0055] Specifically, the inner ring of the heat conducting plate 4 is circular to match the cylindrical magnetic field pole 2, and the outer ring of the heat conducting plate 4 is oriented to match the polygonal sealing cover 122. In actual use, the inner ring of the heat conducting plate 4 can be designed and adapted according to the shape of the magnetic field pole 2, and the outer ring of the heat conducting plate 4 can be designed and adapted according to the shape of the sealing cover 122.

[0056] Specifically, the heat conducting plate 4 is a copper plate with good thermal conductivity. In actual use, the heat conducting plate 4 can also be made of other materials with good thermal conductivity such as aluminum plate or graphite plate.

[0057] Heat sink 5

[0058] A plurality of heat dissipation fins 5 are provided and are respectively located between every two adjacent heat conducting plates 4 .

[0059] It is easy to understand that the number of the heat dissipation fins 5 is one less than the number of the heat conducting plates 4 so that the heat dissipation fins 5 can be located between every two adjacent heat conducting plates 4 .

[0060] Specifically, the heat dissipating fins 5 may be fixed on one of the heat conducting plates 4 , or may be fixed on both heat conducting plates 4 at the same time.

[0061] Specifically, the heat conducting plate 4 and the heat dissipating fins 5 are fixed by bonding with heat conducting silicone. The heat conducting silicone bonding can ensure good heat conductivity and thus ensure heat dissipation efficiency while ensuring the reliability of fixation.

[0062] It should be noted that each heat dissipation fin 5 can be designed as an integral ring, or can be designed as an upper and lower part as shown in this embodiment.

[0063] Specifically, a ventilation gap is reserved between the heat dissipation fins 5 and the corresponding group of coils. The through gap is conducive to ventilation and circulation, thereby improving the heat dissipation efficiency.

[0064] It should be noted that the arrangement direction of the heat dissipation fins 5 must be consistent with the direction of air flow. For example, in this embodiment, the air flows from bottom to top, so the multiple fins of the heat dissipation fins 5 are arranged vertically so that the gaps between the fins are arranged vertically, thereby matching the air flow direction and being more conducive to heat dissipation.

[0065] The working principle of the air-cooled magnetic field press electromagnet of this embodiment is as follows:

[0066] During operation, the axial flow fan of the air inlet 14 guides the outside air into the bottom of the annular cavity 13, and the axial flow fan of the air outlet 15 guides the air in the annular cavity 13 to be discharged from the top to the outside, thus forming an airflow in the annular cavity 13; the heat generated by the coil assembly 3 is transferred to the heat conducting plate 4, and the heat of the heat conducting plate 4 is transferred to the heat dissipating fins 5, and the heat of the heat dissipating fins 5 is taken away by the airflow generated above, thus realizing air-cooled heat dissipation. Example 2

[0067] The magnetic field press provided by the utility model comprises a frame, on which the above-mentioned air-cooled magnetic field press electromagnet is fixed.

[0068] Specifically, the frame includes a left vertical plate 100 and a right vertical plate 200, and air-cooled magnetic field press electromagnets are disposed on the inner sides of the left vertical plate 100 and the right vertical plate 200, and the extended ends of the magnetic field poles 2 of the two air-cooled magnetic field press electromagnets are arranged relative to each other.

[0069] It should be noted that the left vertical plate 100 and the right vertical plate 200 can be directly used as the fixing plate 121 , or the fixing plate 121 can be independently provided and then fixed on the left vertical plate 100 or the right vertical plate 200 .

[0070] The above is only a specific implementation of the utility model, which enables those skilled in the art to understand or implement the utility model. Although detailed descriptions are given with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. An air-cooled magnetic field press electromagnet, characterized in that: include: A housing assembly (1), comprising a coil support (11) and a sealing shell (12), wherein the coil support (11) is a cylindrical structure and is located in the middle of the sealing shell (12), a closed annular cavity (13) is formed between the coil support (11) and the sealing shell (12), and an air inlet (14) and an air outlet (15) which are in communication with the annular cavity (13) are provided on the sealing shell (12); A magnetic field pole (2) coaxially fixed inside the coil support (11) and having one end extending outside the coil support (11); A coil assembly (3) located in the annular cavity (13) and sleeved on the coil support (11), wherein the coil assembly (3) is provided in a plurality of groups and distributed along the axial direction of the coil support (11); A heat conducting plate (4) having an annular structure and mounted on the coil support (11); a plurality of heat conducting plates (4) are provided and are respectively located between each two adjacent groups of coils and at both end surfaces of the coil assembly (3); A plurality of heat dissipation fins (5) are provided and are respectively located between each two adjacent heat conduction plates (4).

2. The air-cooled magnetic field press electromagnet according to claim 1, characterized in that: The heat conducting plate (4) and the heat dissipating fins (5) are bonded and fixed by means of heat conducting silicone.

3. The air-cooled magnetic field press electromagnet according to claim 1, characterized in that: A ventilation gap is reserved between the heat dissipation fins (5) and the corresponding group of coils.

4. The air-cooled magnetic field press electromagnet according to claim 1, characterized in that: The air inlet (14) and the air outlet (15) are both provided with an axial flow fan, and the axial flow fan is used to guide the air to enter through the air inlet (14) or to exit through the air outlet (15).

5. The air-cooled magnetic field press electromagnet according to claim 4, characterized in that: The axis of the coil support (11) is arranged horizontally, the air inlet (14) is connected to the bottom of the annular cavity (13), and the air outlet (15) is connected to the top of the annular cavity (13).

6. The air-cooled magnetic field press electromagnet according to claim 1, characterized in that: The sealing shell (12) comprises a fixing plate (121) and a sealing cover (122); the fixing plate (121), the sealing cover (122) and the coil support (11) together form the annular cavity (13); one end of the magnetic field pole (2) facing the sealing cover (122) protrudes outward from the coil support (11).

7. The air-cooled magnetic field press electromagnet according to claim 6, characterized in that: The fixing plate (121) is provided with a through hole corresponding to the coil support (11), and a mounting cover (6) is fixed on a plate surface of the fixing plate (121) away from the sealing cover (122), the interior of the mounting cover (6) and the interior of the coil support (11) together form a columnar cavity (7), and an adjusting member (8) is provided on the mounting cover (6), the adjusting member (8) is connected to the magnetic field pole (2) and is used to adjust the axial position of the magnetic field pole (2) in the columnar cavity (7).

8. The air-cooled magnetic field press electromagnet according to claim 7, characterized in that: The columnar cavity (7) and the magnetic field pole (2) are both cylindrical, and the adjusting member (8) is an adjusting screw screwed onto the mounting cover (6), the adjusting screw being coaxial with and fixedly connected to the magnetic field pole (2).

9. A magnetic field press, characterized in that: It comprises a frame, on which the air-cooled magnetic field press electromagnet according to any one of claims 1 to 8 is fixed.

10. The magnetic field press according to claim 9, characterized in that: The frame comprises a left vertical plate (100) and a right vertical plate (200), the inner sides of the left vertical plate (100) and the right vertical plate (200) are both provided with the air-cooled magnetic field press electromagnet, and the extended ends of the magnetic field poles (2) of the two air-cooled magnetic field press electromagnets are arranged opposite to each other.

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