Magnetic sensor and manufacturing method thereof

Abstract

The invention provides a magnetic sensor and a manufacturing method thereof, and relates to the technical field of sensors, and the magnetic sensor comprises a housing which is filled with insulating oil; the iron core is arranged in the shell, a secondary coil is wound on the outer side of the iron core, and the insulating oil in the shell is used for absorbing heat generated by the iron core and the secondary coil; and the heat dissipation piece is arranged on the shell and is used for conducting and dissipating heat in the insulating oil to the outside of the shell. According to the magnetic sensor, the shell is filled with the insulating oil, heat generated by the iron core and the secondary coil is absorbed through the insulating oil, and the heat in the insulating oil is conducted and dissipated to the outside of the shell through the heat dissipation piece, so that a good heat dissipation effect is achieved, and normal and stable operation of the current transformer is ensured.

Description

Technical Field

[0001] This application relates to the technical field of sensors, and particularly to a magnetic sensor and a manufacturing method thereof. Background Art

[0002] A magnetic sensor is a device that converts a magnetic field signal into an electrical signal using the principle of magnetoelectric conversion. Common types include electromagnetic induction type, Hall effect type, magnetoresistive effect type, fluxgate, and superconducting quantum interference device, etc. Among them, the working principle of an electromagnetic induction type magnetic sensor is based on Faraday's law of electromagnetic induction, that is, when a coil moves in a magnetic field or the magnetic field changes, an induced electromotive force will be generated in the coil, thereby converting the magnetic field signal into an electrical signal, such as a current transformer and a moving coil microphone, etc.

[0003] When a current transformer is working, due to reasons such as winding resistance and magnetic hysteresis and eddy currents in the iron core, certain power losses will occur, and these losses will be converted into heat, causing the temperature of the transformer to rise. If the heat cannot be dissipated in time, the temperature of the current transformer will continue to rise. Excessive temperature will cause the insulation performance of the current transformer to decline, accelerate the aging of the insulation material, affect the measurement accuracy, and may even cause faults such as insulation breakdown, shortening the service life of the current transformer. To ensure the safe and stable operation of the current transformer, a heat dissipation structure needs to be set up to dissipate heat from the current transformer. For example, the utility model patent with the publication number CN207516429U discloses a closed-loop Hall current sensor, which includes a coil, a printed circuit board, and a heat sink that are arranged in a housing and encapsulated with a colloid for curing. The heat sink is pasted on the printed circuit board, and the heat dissipation of the current sensor is achieved through the heat sink.

[0004] However, during the actual operation of a current transformer, the main heat-generating parts are concentrated in the secondary winding and the iron core. And in the above-mentioned current sensor, the heat sink is pasted on the printed circuit board. Therefore, the heat sink is mainly used to dissipate heat from the printed circuit board, and the heat dissipation effect on the secondary winding and the iron core is poor. When the current in the secondary winding suddenly increases, resulting in increased heat generation, or when the material of the iron core is poor, the cross-sectional design of the iron core is unreasonable, etc., causing an increase in magnetic hysteresis loss and eddy current loss, and thus serious heating of the iron core, it may affect the normal and stable operation of the current transformer. Summary of the Invention

[0005] The purpose of this application is to provide a magnetic sensor and a manufacturing method thereof, which are used to solve the problem that the heat dissipation effect of the current sensor in the related technology on the secondary winding and the iron core is poor, and it may affect the normal and stable operation of the current transformer.

[0006] In the first aspect, a magnetic sensor provided by this application adopts the following technical solution:

[0007] A magnetic sensor, comprising:

[0008] A housing, which is filled with insulating oil;

[0009] An iron core, which is arranged in the housing, a secondary coil is wound around the outside of the iron core, and the insulating oil in the housing is used to absorb the heat generated by the iron core and the secondary coil;

[0010] A heat dissipation component, which is arranged on the housing and is used to conduct and dissipate the heat in the insulating oil to the outside of the housing.

[0011] Optionally, it further includes a rotary drum and a rotary driving component. The iron core is annular, the space inside the housing is an annular cavity corresponding to the iron core, the rotary drum is rotatably arranged in the housing, the iron core passes through the rotary drum, an impeller is arranged on the rotary drum, and the rotary driving component is connected to the rotary drum.

[0012] Optionally, the rotary drum is formed by splicing two split cylinders with a semi-circular cross-section, and the two split cylinders are fixedly connected by a connecting piece.

[0013] Optionally, the rotary driving component includes a rotary driving motor and a speed reducer. The speed reducer is fixedly arranged in the housing, a rotary gear is arranged on the output shaft of the speed reducer, a toothed ring meshing with the rotary gear is arranged on the rotary drum, and the rotary driving motor is fixedly arranged on the housing and is connected to the speed reducer.

[0014] Optionally, the housing is formed by splicing a first housing and a second housing. U-shaped frames clamped on the outside of the iron core are respectively arranged on the first housing and the second housing. Semi-circular ring plates capable of being spliced with each other are respectively arranged on the first housing and the second housing, and the rotary drum is rotatably arranged inside the spliced semi-circular ring plates.

[0015] Optionally, the heat dissipation component includes a metal heat conduction block and a ceramic heat dissipation fin. The metal heat conduction block is fixedly arranged on the housing, heat conduction fins extending into the housing are arranged on the metal heat conduction block, the ceramic heat dissipation fin is fixedly connected to the metal heat conduction block, and the ceramic heat dissipation fin is located outside the housing.

[0016] Optionally, an inner ring guard plate and an outer ring guard plate are arranged on the housing. The ceramic heat dissipation fin is located between the inner ring guard plate and the outer ring guard plate. A baffle is arranged on the housing, a glue filling groove is formed between the inner ring guard plate, the outer ring guard plate and the baffle, the metal heat conduction block is located in the glue filling groove, and epoxy resin glue is filled in the glue filling groove, and the epoxy resin glue completely covers the metal heat conduction block.

[0017] Optionally, it further includes a valve core and a gas valve mechanism. An oil injection nozzle for injecting insulating oil into the housing is provided on the housing. An exhaust hole for discharging the gas inside the housing is provided on the oil injection nozzle. The gas valve mechanism is used to close the exhaust hole after the housing is filled with insulating oil. The valve core is used to open and close the oil injection nozzle and the exhaust hole.

[0018] Optionally, it further includes a locking mechanism and an unlocking mechanism. The locking mechanism is used to lock and connect the insulating oil filling head and the oil injection nozzle after the insulating oil filling head is docked with the oil injection nozzle. The unlocking mechanism is connected to the locking mechanism. The unlocking mechanism is used to release the locking connection between the insulating oil filling head and the oil injection nozzle after the insulating oil pressure inside the housing reaches the critical value.

[0019] In a second aspect, a manufacturing method of a magnetic sensor provided by the present application adopts the following technical solution:

[0020] A manufacturing method for the magnetic sensor described above includes the following steps:

[0021] S1. Install the heat dissipation part on the housing, and install the iron core wound with the secondary coil into the housing;

[0022] S2. Dock the insulating oil filling head with the oil injection nozzle, and lock and connect the insulating oil filling head and the oil injection nozzle through the locking mechanism;

[0023] S3. Inject insulating oil into the housing through the insulating oil filling head. During the injection process, exhaust through the exhaust hole. After the housing is filled with insulating oil, close the exhaust hole through the gas valve mechanism, and then release the locking connection between the insulating oil filling head and the oil injection nozzle through the unlocking mechanism;

[0024] S4. Separate the insulating oil filling head from the oil injection nozzle, and block the oil injection nozzle and the exhaust hole through the valve core.

[0025] In summary, the present application at least includes the following beneficial technical effects: The magnetic sensor of the present application is filled with insulating oil inside the housing. The insulating oil absorbs the heat generated by the iron core and the secondary coil, and conducts and dissipates the heat in the insulating oil to the outside of the housing through the heat dissipation part, thereby achieving a good heat dissipation effect and ensuring the normal and stable operation of the current transformer. Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of the magnetic sensor in the embodiment of the present application;

[0027] Figure 2 It is a cross-sectional view of the magnetic sensor from the first perspective in the embodiment of the present application;

[0028] Figure 3It is a cross-sectional view of the magnetic sensor from the second perspective in the embodiments of the present application;

[0029] Figure 4 It is a cross-sectional view of the magnetic sensor from the third perspective in the embodiments of the present application;

[0030] Figure 5 is Figure 4 a partially enlarged schematic view of part A in

[0031] Figure 6 It is a structural schematic view of the rotary drum in the embodiments of the present application;

[0032] Figure 7 It is a cross-sectional view of the magnetic sensor from the fourth perspective in the embodiments of the present application;

[0033] Figure 8 is Figure 7 a partially enlarged schematic view of part B in

[0034] Figure 9 is Figure 8 a partially enlarged schematic view of part B1 in

[0035] Figure 10 It is a schematic view of filling insulating oil into the housing.

[0036] Explanation of reference numerals:

[0037] 10. Outer shell; 11. First housing; 111. Inner ring guard plate; 112. Outer ring guard plate; 113. Baffle; 12. Second housing; 13. Locking member; 14. U-shaped frame; 141. Support rod; 15. Semi-circular ring plate; 151. Bracket; 152. Positioning pin; 16. Oil injection nozzle; 161. Valve cavity; 162. Oil injection hole; 163. Support; 164. Float cavity; 165. First channel; 166. Second channel; 167. Docking groove; 168. Guide groove; 169. Guide hole; 1610. Through hole; 1611. Limit rod;

[0038] 20. Heat dissipation member; 21. Metal heat conduction block; 211. Heat conduction fins; 22. Ceramic heat dissipation fin; 30. Rotary drum; 31. Sub-cylinder body; 32. Connecting member; 33. Impeller; 34. Gear ring; 40. Rotation driving member; 41. Rotation driving motor; 42. Reducer; 421. Input shaft; 43. Rotation gear;

[0039] 50. Valve core; 51. Valve rod; 52. First spring; 60. Air valve mechanism; 61. Valve block; 611. Tooth row; 612. Valve hole; 613. Avoidance groove; 62. Float; 621. Float rod; 622. Shaft body; 623. Sleeve; 63. Opening and closing gear; 631. Pivot; 632. Connecting rod; 633. Slide groove;

[0040] 70. Locking mechanism; 71. Wedge block; 711. Cylinder; 712. Plate body; 713. Slide column; 72. Second spring; 80. Unlocking mechanism; 81. Piston; 811. Push rod; 82. Third spring; 90. Iron core; 100. Secondary coil; 110. Connector; 120. Epoxy resin glue; 130. Insulating oil filling head; 131. Connecting column; 132. Lock groove; 133. Oil outlet. Detailed implementation mode

[0041] The following will Figure 1 - attached Figure 10 be further described in detail with reference to the attached drawings for this application.

[0042] Embodiment 1

[0043] The embodiment of this application discloses a magnetic sensor.

[0044] A magnetic sensor includes a housing 10, an iron core 90, a heat dissipation member 20, a rotating cylinder 30 and a rotation driving member 40.

[0045] Referring to Figures 1 to 3 , the housing 10 is formed by splicing a first housing 11 and a second housing 12, and is fixedly connected through a locking member 13. The locking member 13 can be a bolt and a nut.

[0046] The iron core 90 is arranged inside the housing 10. A secondary coil 100 is wound around the outside of the iron core 90. The iron core 90 is annular, and the space inside the housing 10 is an annular cavity corresponding to the iron core 90. U-shaped frames 14 are respectively arranged on the first housing 11 and the second housing 12 and are clamped outside the iron core 90. The U-shaped frames 14 are fixedly connected to the inner walls of the first housing 11 and the second housing 12 through support rods 141. The iron core 90 wound with the secondary coil 100 can be supported and fixed inside the housing 10 through the U-shaped frames 14 on the first housing 11 and the second housing 12. A connector 110 is arranged on the first housing 11, and the secondary coil 100 is electrically connected to the connector 110.

[0047] The housing 10 is filled with insulating oil, and the insulating oil inside the housing 10 is used to absorb the heat generated by the iron core 90 and the secondary coil 100. The heat dissipation member 20 is arranged on the housing 10 and is used to conduct and dissipate the heat in the insulating oil to the outside of the housing 10.

[0048] Referring to Figures 1 to 3 , in an optional embodiment, the specific structure of the heat dissipation member 20 and the specific connection relationship with the housing 10 are as follows: The heat dissipation member 20 includes a metal heat conduction block 21 and a ceramic heat dissipation fin 22. The metal heat conduction block 21 is fixedly arranged on the outer wall of the first housing 11 of the housing 10. A heat conduction fin 211 is arranged on the metal heat conduction block 21 and penetrates through the first housing 11 and extends into the interior of the housing 10. The ceramic heat dissipation fin 22 is fixedly connected to the metal heat conduction block 21, and the ceramic heat dissipation fin 22 is located outside the housing 10.

[0049] The metal heat conduction block 21 can be made of copper, and the ceramic heat sink 22 can be made of silicon carbide. The heat in the insulating oil is conducted to the ceramic heat sink 22 through the heat conduction fins 211 and the metal heat conduction block 21, and then dissipated to the outside of the housing 10 through the ceramic heat sink 22. The metal heat conduction block 21 can achieve a good heat conduction effect, and the ceramic heat sink 22 can achieve good insulation and heat dissipation effects.

[0050] An inner ring guard plate 111 and an outer ring guard plate 112 are provided on the first housing 11 of the housing 10. The ceramic heat sink 22 is located between the inner ring guard plate 111 and the outer ring guard plate 112. The inner ring guard plate 111 and the outer ring guard plate 112 can provide a certain protection for the ceramic heat sink 22.

[0051] A baffle 113 is provided on the first housing 11 of the housing 10. A potting groove is formed between the inner ring guard plate 111, the outer ring guard plate 112 and the baffle 113. The metal heat conduction block 21 is located in the potting groove. Epoxy resin glue 120 is potted in the potting groove. The epoxy resin glue 120 completely covers the metal heat conduction block 21. The epoxy resin glue 120 can insulate the metal heat conduction block 21 and at the same time seal the penetration of the heat conduction fins 211 and the first housing 11.

[0052] Refer to Figures 4 to 7 , the rotating cylinder 30 is rotatably arranged in the housing 10. The rotating cylinder 30 is formed by splicing two split cylinders 31 with a semi-circular cross-section. The two split cylinders 31 are fixedly connected by a connecting member 32. The connecting member 32 can be a stud and a nut. An impeller 33 is provided on the rotating cylinder 30. The iron core 90 passes through the rotating cylinder 30.

[0053] In an alternative embodiment, the specific connection relationship between the rotating cylinder 30 and the housing 10 is as follows: Semi-circular ring plates 15 that can be spliced with each other are provided on the first housing 11 and the second housing 12 respectively. The semi-circular ring plates 15 are fixedly connected to the inner walls of the first housing 11 and the second housing 12 through brackets 151. A pin hole is provided on one of the semi-circular ring plates 15, and a positioning pin 152 that can be inserted into the pin hole is provided on the other semi-circular ring plate 15. The rotating cylinder 30 is rotatably arranged in the spliced semi-circular ring plates 15.

[0054] When installing the rotating drum 30 into the housing 10, first place a split cylinder body 31 on the semi-circular ring plate 15 on the second housing 12. Then, place the iron core 90 wound with the secondary coil 100 on the U-shaped frame 14 on the second housing 12. Next, fix and connect the two split cylinder bodies 31 together through the connecting piece 32. Then, fix and connect the first housing 11 and the second housing 12 through the locking piece 13. After splicing, the semi-circular ring plates 15 on the first housing 11 and the second housing 12 are spliced together, and the positioning pin 152 is inserted into the pin hole to limit the rotating drum 30. At the same time, the U-shaped frames 14 on the first housing 11 and the second housing 12 are clamped outside the iron core 90 wound with the secondary coil 100 to limit the iron core 90 wound with the secondary coil 100.

[0055] Referring to Figure 1 and Figure 5 , the rotary drive member 40 is connected to the rotating drum 30. In an alternative embodiment, the specific structure of the rotary drive member 40 and its specific connection relationship with the rotating drum 30 are as follows: The rotary drive member 40 includes a rotary drive motor 41 and a speed reducer 42. The speed reducer 42 is fixed on the inner wall of the second housing 12 inside the housing 10. A rotary gear 43 is provided on the output shaft of the speed reducer 42. A toothed ring 34 meshing with the rotary gear 43 is provided on the rotating drum 30. The rotary drive motor 41 is fixed on the outer wall of the second housing 12 of the housing 10 and is connected to the input shaft 421 of the speed reducer 42.

[0056] The implementation principle of the magnetic sensor in this embodiment is as follows: When the magnetic sensor of the present application is working, the rotary drive motor 41 and the speed reducer 42 are used to drive the rotary gear 43 to rotate. Then, the rotating drum 30 and the impeller 33 are driven through the rotary gear 43 and the toothed ring 34. The impeller 33 is used to drive the insulating oil to circulate in the annular cavity inside the housing 10, so that the insulating oil fully contacts the heat conduction fins 211. The heat in the insulating oil is conducted to the ceramic heat sink 22 through the heat conduction fins 211 and the metal heat conduction block 21, and then dissipated to the outside of the housing 10 through the ceramic heat sink 22, achieving a good heat dissipation effect on the magnetic sensor.

[0057] Embodiment 2

[0058] The embodiment of the present application discloses a magnetic sensor.

[0059] Referring to Figures 7 to 9 , the difference between the magnetic sensor in this embodiment and that in Embodiment 1 is that it further includes a valve core 50 and a gas valve mechanism 60. An oil injection nozzle 16 for injecting insulating oil into the housing 10 is provided on the first housing 11 of the housing 10. An exhaust hole for discharging the gas inside the housing 10 is provided on the oil injection nozzle 16. The gas valve mechanism 60 is used to close the exhaust hole after the housing 10 is filled with insulating oil. The valve core 50 is used to open and close the oil injection nozzle 16 and the exhaust hole.

[0060] In an alternative embodiment, the specific connection relationship between the valve core 50 and the oil injection nozzle 16 is as follows: A valve cavity 161 communicating with the interior of the housing 10 and an oil injection hole 162 communicating with the valve cavity 161 are provided on the oil injection nozzle 16. A support 163 is provided on the oil injection nozzle 16. A valve stem 51 is provided on the valve core 50. The valve stem 51 slidably passes through the support 163. A first spring 52 is sleeved outside the valve stem 51. Two ends of the first spring 52 respectively abut against the valve core 50 and the support 163. The valve core 50 blocks the oil injection hole 162 and the exhaust hole under the elastic force of the first spring 52.

[0061] In an alternative embodiment, the specific structure of the air valve mechanism 60 is as follows: The air valve mechanism 60 includes a valve block 61, a float 62 and an opening and closing gear 63. A float cavity 164 is provided on the oil injection nozzle 16. The exhaust hole includes a first hole 165 communicating with the valve cavity 161 and the float cavity 164, and a second hole 166 communicating with the valve cavity 161 and the outside of the oil injection nozzle 16. The valve core 50 blocks the first hole 165 of the exhaust hole under the elastic force of the first spring 52. The valve block 61 is slidably arranged on the oil injection nozzle 16. A valve hole 612 capable of coinciding with the second hole 166 is provided on the valve block 61. A tooth row 611 is provided on the valve block 61. The opening and closing gear 63 is rotatably arranged on the oil injection nozzle 16 through a pivot 631 and meshes with the tooth row 611. The float 62 is arranged in the float cavity 164. A float rod 621 is provided on the float 62. The float rod 621 is slidably arranged on the oil injection nozzle 16. A connecting rod 632 is provided on the opening and closing gear 63. A chute 633 is provided on the connecting rod 632. A shaft body 622 is provided on the float rod 621. A sleeve 623 is rotatably sleeved outside the shaft body 622. The sleeve 623 passes through the chute 633. A limiting rod 1611 for limiting the swinging angle of the connecting rod 632 is provided on the oil injection nozzle 16. An avoidance groove 613 for avoiding the connecting rod 632 is provided on the valve block 61.

[0062] Referring to Figure 8 and Figure 10 This embodiment's magnetic sensor further includes a locking mechanism 70 and an unlocking mechanism 80. The locking mechanism 70 is used to lock and connect the insulating oil filling head 130 and the oil injection nozzle 16 after the insulating oil filling head 130 is docked with the oil injection nozzle 16. The unlocking mechanism 80 is connected to the locking mechanism 70. The unlocking mechanism 80 is used to release the locking connection between the insulating oil filling head 130 and the oil injection nozzle 16 after the insulating oil pressure in the housing 10 reaches the critical value.

[0063] In an alternative embodiment, the specific structure of the locking mechanism 70 and its specific connection relationship with the insulating oil filling head 130 are as follows: The locking mechanism 70 includes a wedge block 71 and a second spring 72. The filling nozzle 16 is provided with a docking groove 167 and a guiding groove 168 communicating with the docking groove 167. The wedge block 71 is slidably disposed in the guiding groove 168. A cylinder 711 is provided on the wedge block 71. The cylinder 711 passes through the filling nozzle 16. A plate body 712 is provided at the end of the cylinder 711 protruding from the filling nozzle 16. The second spring 72 is sleeved outside the cylinder 711. The two ends of the second spring 72 are respectively abutted against the wedge block 71 and the end face of the guiding groove 168. A sliding column 713 is provided on the plate body 712. The sliding column 713 is slidably inserted into the filling nozzle 16. The insulating oil filling head 130 is provided with a connecting column 131 that can be inserted into the docking groove 167. A locking groove 132 is provided on the connecting column 131. The wedge block 71 can be engaged with the locking groove 132. An oil outlet 133 is provided on the side wall of the insulating oil filling head 130.

[0064] In an alternative embodiment, the specific structure of the unlocking mechanism 80 and its specific connection relationship with the locking mechanism 70 are as follows: The unlocking mechanism 80 includes a piston 81 and a third spring 82. The filling nozzle 16 is provided with a guiding hole 169. The piston 81 is slidably disposed in the guiding hole 169. A push rod 811 is provided on the piston 81. The filling nozzle 16 is provided with a through hole 1610. The push rod 811 is slidably inserted into the through hole 1610. The push rod 811 can push the plate body 712. The third spring 82 is sleeved outside the push rod 811. The two ends of the third spring 82 are respectively abutted against the piston 81 and the end face of the guiding hole 169.

[0065] The embodiment of the present application also discloses a manufacturing method of a magnetic sensor.

[0066] A manufacturing method of a magnetic sensor includes the following steps:

[0067] S1. Install the heat dissipation member 20 and the rotary driving member 40 on the housing 10, and install the iron core 90 wound with the secondary coil 100 and the rotating cylinder 30 into the housing 10.

[0068] S2. Docking the insulating oil filling head 130 with the filling nozzle 16, and locking and connecting the insulating oil filling head 130 and the filling nozzle 16 through the locking mechanism 70.

[0069] More specifically, insert the insulating oil filling head 130 into the filling hole 162, overcome the elastic force of the first spring 52 to push open the valve core 50, and at the same time insert the connecting column 131 into the docking groove 167 until the wedge block 71 is engaged with the locking groove 132, locking and connecting the insulating oil filling head 130 and the filling nozzle 16.

[0070] S3. Insulating oil is poured into the housing 10 through the insulating oil filling head 130, and exhaust is discharged through the exhaust hole during the filling process. After the housing 10 is filled with insulating oil, the exhaust hole is closed by the air valve mechanism 60, and then the locking connection between the insulating oil filling head 130 and the oil filling nozzle 16 by the locking mechanism 70 is released by the unlocking mechanism 80.

[0071] More specifically, the insulating oil is injected into the housing 10 through the oil outlet 133 of the insulating oil filling head 130. During the filling process, the gas in the housing 10 is discharged through the first channel 165, the float chamber 164, the second channel 166 and the valve hole 612. When the housing 10 is filled with insulating oil, the insulating oil enters the float chamber 164 through the first channel 165 and fills the float chamber 164. Then, under the action of buoyancy, the float 62 rises and pushes the connecting rod 632 and the opening and closing gear 63 to rotate through the float rod 621, and then drives the valve block 61 to slide through the opening and closing gear 63 and the gear row 611, so that the valve hole 612 is staggered with the second channel 166, and the second channel 166 is closed through the valve block 61.

[0072] Then the oil pressure in the valve chamber 161 rises. When the oil pressure reaches the critical value, the oil pressure overcomes the elastic force of the third spring 82 and pushes the piston 81 to slide along the guide hole 169, and pushes the plate body 712 through the push rod 811, and then the plate body 712 overcomes the elastic force of the second spring 72 to drive the wedge block 71 to withdraw from the locking groove 132, thereby releasing the locking connection between the locking mechanism 70 and the insulating oil filling head 130 and the oil filling nozzle 16.

[0073] S4. Separate the insulating oil filling head 130 from the oil filling nozzle 16, and push the valve core 50 through the first spring 52 to block the oil filling nozzle 16 and the exhaust hole.

[0074] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A magnetic sensor, characterized in that, Comprising: A housing (10), with insulating oil filled inside the housing (10); An iron core (90), which is arranged inside the housing (10), a secondary coil (100) is wound around the outside of the iron core (90), and the insulating oil inside the housing (10) is used to absorb the heat generated by the iron core (90) and the secondary coil (100); A heat dissipation component (20), which is arranged on the housing (10) and is used to conduct and dissipate the heat in the insulating oil to the outside of the housing (10).

2. A magnetic sensor according to claim 1, wherein, It further includes a rotating cylinder (30) and a rotation driving component (40), the iron core (90) is annular, the space inside the housing (10) is an annular cavity corresponding to the iron core (90), the rotating cylinder (30) is rotatably arranged inside the housing (10), the iron core (90) passes through the rotating cylinder (30), an impeller (33) is arranged on the rotating cylinder (30), and the rotation driving component (40) is connected to the rotating cylinder (30).

3. A magnetic sensor according to claim 2, wherein The rotating cylinder (30) is formed by splicing two split cylinders (31) with a semi-circular cross-section, and the two split cylinders (31) are fixedly connected through a connecting piece (32).

4. A magnetic sensor according to claim 2, wherein The rotation driving component (40) includes a rotation driving motor (41) and a speed reducer (42), the speed reducer (42) is fixedly arranged inside the housing (10), a rotation gear (43) is arranged on the output shaft of the speed reducer (42), a toothed ring (34) meshing with the rotation gear (43) is arranged on the rotating cylinder (30), and the rotation driving motor (41) is fixedly arranged on the housing (10) and is connected to the speed reducer (42).

5. A magnetic sensor according to claim 2, wherein The housing (10) is formed by splicing a first shell (11) and a second shell (12), U-shaped frames (14) clamped on the outside of the iron core (90) are respectively arranged on the first shell (11) and the second shell (12), semi-circular ring plates (15) capable of being spliced with each other are respectively arranged on the first shell (11) and the second shell (12), and the rotating cylinder (30) is rotatably arranged inside the spliced semi-circular ring plates (15).

6. A magnetic sensor according to claim 1, wherein The heat dissipation component (20) includes a metal heat conduction block (21) and a ceramic heat dissipation fin (22), the metal heat conduction block (21) is fixedly arranged on the housing (10), heat conduction fins (211) extending into the inside of the housing (10) are arranged on the metal heat conduction block (21), the ceramic heat dissipation fin (22) is fixedly connected to the metal heat conduction block (21), and the ceramic heat dissipation fin (22) is located outside the housing (10).

7. A magnetic sensor according to claim 6, wherein An inner ring guard plate (111) and an outer ring guard plate (112) are provided on the housing (10). The ceramic heat sink (22) is located between the inner ring guard plate (111) and the outer ring guard plate (112). A baffle (113) is provided on the housing (10). A potting groove is formed among the inner ring guard plate (111), the outer ring guard plate (112) and the baffle (113). The metal heat conducting block (21) is located in the potting groove. Epoxy resin glue (120) is potted in the potting groove, and the epoxy resin glue (120) completely covers the metal heat conducting block (21).

8. A magnetic sensor according to claim 1, characterized in that, It further includes a valve core (50) and a gas valve mechanism (60). An oil injection nozzle (16) for injecting insulating oil into the housing (10) is provided on the housing (10). An exhaust hole for discharging the gas in the housing (10) is provided on the oil injection nozzle (16). The gas valve mechanism (60) is used for closing the exhaust hole after the housing (10) is filled with insulating oil. The valve core (50) is used for opening and closing to block the oil injection nozzle (16) and the exhaust hole.

9. A magnetic sensor according to claim 8, characterized in that, It further includes a locking mechanism (70) and an unlocking mechanism (80). The locking mechanism (70) is used for locking and connecting an insulating oil filling head (130) and the oil injection nozzle (16) after the insulating oil filling head (130) is docked with the oil injection nozzle (16). The unlocking mechanism (80) is connected with the locking mechanism (70). The unlocking mechanism (80) is used for releasing the locking connection of the locking mechanism (70) to the insulating oil filling head (130) and the oil injection nozzle (16) after the insulating oil pressure in the housing (10) reaches the critical value.

10. A manufacturing method for the magnetic sensor according to claim 9, characterized in that, It includes the following steps: S1. Install the heat dissipation member (20) on the housing (10), and install the iron core (90) wound with the secondary coil (100) into the housing (10). S2. Dock the insulating oil filling head (130) with the oil injection nozzle (16), and lock and connect the insulating oil filling head (130) and the oil injection nozzle (16) through the locking mechanism (70). S3. Inject insulating oil into the housing (10) through the insulating oil filling head (130), exhaust through the exhaust hole during the injection process. After the housing (10) is filled with insulating oil, close the exhaust hole through the gas valve mechanism (60), and then release the locking connection of the locking mechanism (70) to the insulating oil filling head (130) and the oil injection nozzle (16) through the unlocking mechanism (80). S4. Separate the insulating oil filling head (130) from the oil injection nozzle (16), and block the oil injection nozzle (16) and the exhaust hole through the valve core (50).

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