A rapidly cooled magnetic field coil

Abstract

The utility model discloses a kind of quick-cooled magnetic field coils, including coil, embedded spiral copper pipe and glass fiber reinforced layer, gap between coil and embedded spiral copper pipe is filled with resin, glass fiber reinforced layer is provided in resin, coil end part reserves temperature sensor interface, the utility model can high-efficiency heat dissipation: through high thermal conductivity epoxy resin directly wrapping copper pipe and coil, shorten heat conduction path, realize quick cooling;Compact structure: cancel external water cooling jacket, reduce coil overall volume, adapt narrow experimental space;Can high insulating property and thermal conductivity be considered: select modified epoxy resin, ensure electrical safety while improving heat dissipation efficiency;Prolong working life: reduce coil high-temperature fatigue loss, support long time continuous high-power operation.

Description

Technical Field

[0001] This utility model relates to the field of high-power magnetic field coil technology, specifically a rapidly cooling magnetic field coil. Background Technology

[0002] Currently, the heat dissipation technology for high-power magnetic field coils (such as electromagnets and pulse magnetic field coils) used in scientific research and industry faces the following problems:

[0003] 1. Traditional air cooling is inefficient: When operating at high current, the coil temperature rises rapidly, and air cooling cannot meet the rapid heat dissipation requirements, resulting in a decrease in magnetic field stability;

[0004] 2. The separate water-cooling structure is bulky: Most existing water-cooling coils adopt external copper tube winding or external water-cooling jacket design, which are large in size and have long heat conduction paths, resulting in slow cooling response;

[0005] 3. Insulation and heat dissipation contradiction: Coil insulation materials (such as ordinary epoxy resin) have poor thermal conductivity and are prone to aging at high temperatures, while high thermal conductivity materials (such as metal encapsulation) may cause short circuit risks.

[0006] 4. Difficult to maintain: The separate design of the water-cooled pipes and coils makes replacement complicated and maintenance costly after damage. Utility Model Content

[0007] The purpose of this invention is to provide a rapidly cooling magnetic field coil to solve the problems mentioned in the background art, such as low air-cooling efficiency, bulky separate water-cooling structure, contradiction between insulation and heat dissipation, and difficulty in maintenance of existing high-power magnetic field coils.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a rapidly cooling magnetic field coil, comprising a coil, an embedded spiral copper tube, and a glass fiber reinforcement layer. The gap between the coil and the embedded spiral copper tube is filled with resin, and a glass fiber reinforcement layer is disposed within the resin. A temperature sensor interface is reserved at the end of the coil.

[0009] The embedded spiral copper tube uses pure copper windings.

[0010] The glass fiber reinforcement layer is composed of layers of 0.2mm fiberglass mesh.

[0011] The coil and the embedded spiral copper tube are fixed by being wound with a glass fiber reinforcement layer for 4 turns.

[0012] An embedded spiral copper tube is welded to the end of a round copper tube, which is then quickly connected to the water distributor to receive water.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This invention achieves efficient heat dissipation: by directly wrapping the copper tube and coil with high thermal conductivity epoxy resin, the heat conduction path is shortened, achieving rapid cooling (temperature rise reduced by more than 30%); it features a compact structure: eliminating the external water cooling jacket reduces the overall volume of the coil, making it suitable for narrow experimental spaces; it balances high insulation and thermal conductivity: using modified epoxy resin (thermal conductivity ≥2.0W / m·K) ensures electrical safety while improving heat dissipation efficiency; and it extends service life: reducing high-temperature fatigue loss of the coil and supporting long-term continuous high-power operation. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a top view of the present invention;

[0017] Figure 3 for Figure 2 Cross-sectional view along the AA direction.

[0018] In the above attached diagram, coil 1, embedded spiral copper tube 2, glass fiber reinforcement layer 3, temperature sensor interface 5, round copper tube 6, water distributor 7, quick-connect fitting 8. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0020] like Figure 1-3 As shown, the rapid cooling magnetic field coil 1 provided by this utility model includes a coil 1, an embedded spiral copper tube 2, and a glass fiber reinforcement layer 3. The coil 1 and the embedded spiral copper tube 2 are arranged in alternating layers. The embedded spiral copper tube 2 is made of pure copper winding and is filled with cooling water. The embedded spiral copper tube 2 for cooling is pre-bent into a tight spiral shape and wound synchronously with the coil 1 winding to ensure uniform heat dissipation. The gap between the coil 1 and the embedded spiral copper tube 2 is filled with resin to form a resin layer. The modified epoxy resin filled with nano-alumina is used to form a copper tube-coil 1-resin structure after casting. The composite structure directly wraps the embedded spiral copper tube 2 and coil 1 with high thermal conductivity epoxy resin, shortening the heat conduction path and achieving rapid cooling (temperature rise reduced by more than 30%). The glass fiber reinforcement layer 3 is set inside the resin layer, and the distance between the conductor of the embedded spiral copper tube 2 and the coil 1 is ≤2mm. The resin directly fills the gap, reducing thermal resistance. The glass fiber reinforcement layer 3 is composed of 0.2mm fiberglass mesh fabric layers. The glass fiber reinforcement layer 3 is added to the resin to prevent cracking due to thermal expansion and contraction. The coil 1 and the embedded spiral copper tube 2 are also fixed by being wound with 4 turns of glass fiber reinforcement layer 3.

[0021] A temperature sensor interface 5 is reserved at the end of coil 1, which can monitor the temperature of hot spots in real time.

[0022] The end of the embedded spiral copper tube 2 is welded with a round copper tube 6, and the round copper tube 6 is connected to the water distributor 7 via a quick-connect fitting 8 to achieve water connection; the inlet and outlet of the embedded spiral copper tube 2 adopt quick-connect fittings to facilitate external water circuit connection.

[0023] The casting process of this utility model is as follows: The coil 1 and its water and electricity components, namely the embedded spiral copper tube 2 and the welded round copper tube 6, are assembled into a casting mold and placed in a vacuum tank. Epoxy resin is pumped into the casting mold from above under a negative pressure of -0.1 MPa. After potting and fixing, the mold is removed and demolded.

[0024] The rapid cooling magnetic field coil 1 provided by this utility model has improved heat dissipation performance: compared with the traditional air-cooled coil 1, the continuous working temperature rise is reduced by more than 50%, and it supports higher current density;

[0025] • Size and weight optimization: After removing the external water cooling jacket, coil 1's volume is reduced by approximately 25%, and its weight is reduced by 15%;

[0026] • Enhanced reliability: After curing, epoxy resin is moisture-proof and shockproof, making it suitable for complex environments (such as low temperature and vacuum systems).

[0027] • Easy maintenance: The integrated structure reduces the risk of water leakage, and the entire module can be replaced directly when damaged;

[0028] • Cost advantage: The casting process simplifies the production process and reduces manufacturing costs.

[0029] The production steps include:

[0030] Step 1: Pre-assembly of coil 1 and copper tube

[0031] • The enameled copper wire winding (coil 1) and the pre-formed copper cooling tube (wall thickness 1mm) (embedded spiral copper tube 2) are wound coaxially. The spacing of the embedded spiral copper tube 2 is optimized according to the thermal simulation results.

[0032] Step 2: Mold Positioning

[0033] Place the assembly into the mold, fix the position of the copper pipe inlet and outlet, and ensure that it does not shift after the resin is poured.

[0034] Step 3: Vacuum casting

[0035] • Modified epoxy resin is injected under vacuum to remove air bubbles, and a dense structure is formed after curing.

[0036] Step 4: Post-processing and testing

[0037] • After curing, remove the mold and conduct a high-voltage insulation test (withstand voltage ≥5kV).

[0038] • Water flow rate and temperature rise curves during water circulation test.

Claims

1. A rapidly cooling magnetic field coil, characterized in that, It includes a coil, an embedded spiral copper tube, and a glass fiber reinforcement layer. The gap between the coil and the embedded spiral copper tube is filled with resin, and a glass fiber reinforcement layer is set inside the resin. A temperature sensor interface is reserved at the end of the coil.

2. The rapidly cooling magnetic field coil according to claim 1, characterized in that, The embedded spiral copper tube uses pure copper windings.

3. The rapidly cooling magnetic field coil according to claim 1, characterized in that, The glass fiber reinforcement layer is composed of layers of 0.2mm fiberglass mesh.

4. The rapidly cooling magnetic field coil according to claim 1, characterized in that, The coil and the embedded spiral copper tube are fixed by being wound with a glass fiber reinforcement layer for 4 turns.

5. A rapidly cooling magnetic field coil according to claim 1, characterized in that, An embedded spiral copper tube is welded to the end of a round copper tube, which is then quickly connected to the water distributor to receive water.

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