A spray cooling device for cooling electromagnetic coils

Abstract

The present invention discloses a spray cooling device for cooling electromagnetic coils, which mainly includes a shell, a liquid collecting tank, a liquid inlet tank, a nozzle array, an electromagnetic coil, a working fluid pump, a liquid storage tank, a spray cavity and other components. The present invention uses a spray cooling device to cool the outer surface of the electromagnetic coil, and atomizes the working fluid into fine droplets through a nozzle to exchange heat on the heating surface and take away heat; the shape of the liquid inlet tank ensures that the cooling working fluid has good flow uniformity in the channel to ensure efficient heat exchange; the nozzle atomization on the nozzle array ensures the uniformity of heat exchange, and spray cooling is used to perform thermal management on the electromagnetic coil with high heat flux density, thereby ensuring the service life of epoxy resin and electromagnetic wire group. The present invention solves the problem of large local heat flux density of the electromagnetic coil and provides a basis for subsequent electromagnetic coil cooling.

Description

Technical Field

[0001] The invention relates to the field of pulse coil cooling, in particular to a spray cooling device for cooling an electromagnetic coil. Background Art

[0002] Due to the existence of internal resistance, part of the energy of the pulse power supply will be converted into heat and distributed in the high-power components when it is discharged. Under the discharge condition of load short circuit, the stored electric energy will be almost completely converted into the internal heat of the power supply. Since the discharge time is very short and most high-power components adopt an insulating sealed structure, which is not conducive to heat dissipation, repeated and continuous operation will cause heat to accumulate quickly inside the power supply, and the temperature inside the component will rise sharply, and then insulation overheating damage will occur, and electric thermal breakdown failure will occur. The higher the degree of miniaturization of the pulse power supply and the more compact the structure, the more prominent the heating problem. The electromagnetic coil is forced to cool by air, but the heat dissipation effect of the electromagnetic coil is poor. Compared with air cooling technology, liquid cooling technology has the characteristics of high cooling efficiency, stable operation, and low energy consumption. According to actual engineering needs, liquid cooling technology includes microchannel heat exchanger, spray cooling, jet cooling, etc. Spray cooling has a small flow rate but high heat dissipation efficiency, which has become the main research direction of liquid cooling technology application. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a spray cooling device for cooling an electromagnetic coil.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a spray cooling device for cooling electromagnetic coils, comprising liquid inlet and outlet pipe sections, a working fluid pump, a liquid storage tank and a spray cooling module, wherein the spray cooling module comprises a spray cavity, a spray array, an electromagnetic coil and a liquid collecting tank; an electromagnetic coil is arranged in the spray cavity, a gap between the spray cavity and the shell is a liquid inlet tank, the liquid inlet tank is a wedge-shaped structure, and the inner wall of the liquid inlet tank is fixed to the shell; an array of nozzles distributed at equal distances is arranged on the inner side of the liquid inlet tank, and the nozzle array is vertically welded to the inlet tank. Liquid tank; one end of the shell side wall is connected to a liquid inlet pipe section, which is connected to the top of the shell; one end of the shell is connected to a liquid collecting tank, which is fixed to the bottom of the shell; one end of the liquid collecting tank side wall is connected to a liquid outlet pipe section, which is connected to a refrigeration device; a flow valve and a flow meter are installed on the liquid inlet pipe section; the liquid inlet pipe section is connected to a liquid storage tank and a working fluid pump; a hole is opened in the middle of each of the two ends of the shell for inlet and outlet connection of the two ends of the electromagnetic coil; the vacuum pump exhaust pipe is sealed and connected to the top of the shell, and a pressure gauge is installed on the vacuum pump exhaust pipe.

[0005] The beneficial effects of the present invention are as follows: compared with the traditional cooling technology, a spray cooling device is used to cool the outer surface of the electromagnetic coil, and the working fluid is atomized into fine droplets through the nozzle to exchange heat on the heating surface and take away the heat; the shape of the liquid inlet tank ensures that the cooling working fluid has good flow uniformity in the channel to ensure efficient heat exchange; the cooling working fluid further enhances the heat exchange; the nozzle atomization on the nozzle array ensures the uniformity of heat exchange. The shell of the present invention includes a vacuum exhaust pipe and a liquid collecting tank. The vacuum exhaust pipe ensures the vacuum environment in the spray cavity, and the boiling point of the cooling working fluid in the spray cavity is reduced, so that the cooling working fluid is in the two-phase region, and the heat exchange capacity is significantly enhanced; the slope of the liquid inlet tank ensures that the cooling working fluid flows and is guided to converge into the liquid collecting tank. The liquid collecting tank is connected to the liquid outlet pipe section and guides the cooling working fluid to flow out. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 This is a structural schematic diagram of a new electromagnetic coil spray cooling device (including a water storage tank and a working fluid pump) proposed by the present invention.

[0007] Figure 2 The present invention is a schematic cross-sectional view of a novel electromagnetic coil spray cooling device (spray cooling module).

[0008] Figure 3 The present invention provides a schematic side cross-sectional view of a novel electromagnetic coil spray cooling device.

[0009] In the figure: 1-shell, 2-liquid inlet pipeline, 3-electromagnetic coil port 1, 4-liquid collecting tank, 5-water outlet pipeline, 6-liquid inlet tank, 7-nozzle array, 8-electromagnetic coil, 9-electromagnetic coil port 2, 10-working fluid pump, 11-liquid storage tank, 12-spray chamber, 13-flow meter, 14-flow valve, 15-vacuum pump exhaust pipeline, 16-pressure gauge DETAILED DESCRIPTION

[0010] Due to the existence of internal resistance, part of the energy of the pulse power supply will be converted into heat and distributed in the high-power components when it is discharged. Under the discharge condition of load short circuit, the stored electrical energy will be almost completely converted into the internal heat of the power supply. Spray cooling has a small flow rate but high heat dissipation efficiency, and has become the main research direction of the current application of liquid cooling technology. Therefore, a spray cooling device for electromagnetic coil cooling is proposed. The present invention solves the problem of large local heat flux density of the electromagnetic coil and provides a basis for subsequent electromagnetic coil cooling. The present invention uses spray cooling to perform thermal management on electromagnetic coils with high heat flux density, thereby ensuring the service life of epoxy resin and electromagnetic wire group.

[0011] like Figure 1 to Figure 3As shown, a cooling device for an electromagnetic coil of the present invention comprises a spray cooling module, a liquid inlet and outlet pipe section, a working fluid pump 10, a liquid storage tank 11, an instrument, and a valve; the spray cooling module comprises a spray cavity 12, a spray array 7, an electromagnetic coil 8, and a liquid collecting tank 4; the electromagnetic coil 8 is arranged in the spray cavity 12, and the gap between the spray cavity 12 and the shell 1 is a liquid inlet tank 6, which is a wedge-shaped structure, and the inner wall of the liquid inlet tank 6 is welded and fixed to the shell 1; a plurality of nozzle arrays distributed at equal distances are arranged on the inner side of the liquid inlet tank 6, and the nozzle array 7 is vertically welded to the liquid inlet tank 6; one end of the side wall of the shell 1 is connected to the liquid inlet pipe section 2 The liquid inlet pipe section 2 is connected to the top of the shell 1; one end of the shell 1 is connected to a liquid collecting tank 4, which is welded to the bottom of the shell; one end of the side wall of the liquid collecting tank 4 is connected to a liquid outlet pipe section 5, which is connected to a refrigeration device; a flow valve 14 and a flow meter 13 are installed on the liquid inlet pipe section 2; the liquid inlet pipe section 2 is connected to a liquid storage tank 11 and a working fluid pump 10; a hole is opened in the middle of each of the two ends of the shell 1, which are respectively an electromagnetic coil port 1 3 and an electromagnetic coil port 2 9, which are used for the inlet and outlet connections of the two ends of the electromagnetic coil 8; the vacuum pump exhaust pipe 15 is sealed and connected to the top of the shell 1, and a pressure gauge 16 is installed on the vacuum pump exhaust pipe 15.

[0012] Preferably, a sealing rubber ring is used at the connection between the liquid inlet pipe section 2 and the working fluid pump 10.

[0013] Preferably, the liquid inlet pipe section 2 is connected to the working fluid pump 10 using a flexible joint.

[0014] Preferably, the liquid inlet and outlet pipe sections are made of seamless corrosion-resistant material.

[0015] Preferably, the inlet and outlet pipe sections, the liquid collecting tank 4, the liquid storage tank 11, and the shell 1 all have insulation measures.

[0016] Preferably, the nozzle array 7 has a plurality of nozzles arranged in a ring-shaped distribution, and all the nozzles are directed toward the electromagnetic coil 8 to ensure that the spray droplets evenly cover the surface of the electromagnetic coil.

[0017] Preferably, both ends of the shell 1 are arc-shaped structures.

[0018] Preferably, the liquid inlet groove 6 is composed of a wedge and a cylinder.

[0019] Preferably, the cooling medium is insulated and is a nanofluid, an alcohol liquid, a soluble salt solution, or a liquid containing a surfactant.

[0020] Preferably, the liquid inlet pipe section 2 is vertically and sealedly connected to one end of the shell 1 , and the liquid outlet pipe section 5 is vertically and sealedly connected to the liquid collecting tank 4 .

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only some embodiments of the present invention and are not regarded as restrictive solutions.

[0022] Example

[0023] Combination Figure 1 , Figure 2 , Figure 3 , a spray cooling device for cooling an electromagnetic coil, comprising an inlet and outlet pipe section, a working fluid pump 10, a liquid storage tank 11 and a spray cooling module, wherein the spray cooling module comprises a spray cavity 12, a spray array 7, an electromagnetic coil 8, and a liquid collecting tank 4;

[0024] The liquid storage tank 11, the working fluid pump 10 and the shell 1 are connected through a liquid inlet pipeline. When the cooling working fluid flows out of the refrigeration device, it enters the liquid storage tank 11 to store the cooling working fluid; the working fluid pump 10 provides power for the cooling working fluid; the liquid inlet pipeline 2 is installed with a flow meter 13 and a flow valve 14, which are respectively used to obtain the cooling working fluid flow data and adjust the cooling working fluid flow, and the liquid inlet pipeline 2 is connected to the top of the shell 1, and the cooling working fluid enters the liquid inlet tank 6; the liquid inlet tank 6 is welded inside the shell, and the shape ensures that the cooling working fluid has good flow uniformity in the channel; the cooling working fluid is sprayed out through the nozzle array 7, and the nozzle array 7 consists of a plurality of equidistant The shell body 1 is composed of a circular array, the nozzle array 7 is vertically welded on the liquid inlet tank 6, and the nozzles are all aimed at the electromagnetic coil 8; the vacuum pump exhaust pipe 15 is installed on the top of the shell body to ensure the vacuum environment of the spray cavity 12, and the vacuum pump exhaust pipe 15 is equipped with a pressure gauge 16 for obtaining the pressure data in the cavity. The boiling point of the cooling medium is reduced, so that the cooling medium is in a two-phase state, which enhances the heat exchange effect; the cooling medium forms a liquid film on the electromagnetic coil 8 and drips into the liquid collecting tank 4, and part of the cooling medium slides along the shell body 1 into the liquid collecting tank 4, and the liquid collecting tank 4 is welded to the shell body 1; the liquid outlet pipe section 5 is connected to the liquid collecting tank 4, and the cooling medium flows out from the liquid outlet pipe section 5 into the refrigeration device.

[0025] The above-mentioned embodiment only expresses one of the implementation modes of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, changes, modifications, substitutions and variations of the above-mentioned embodiment are all within the protection scope of the present invention.

Claims

1. A spray cooling device for cooling electromagnetic coils, characterized in that: The invention comprises a liquid inlet and outlet pipe section, a working fluid pump (10), a liquid storage tank (11) and a spray cooling module, wherein the spray cooling module comprises a spray cavity (12), a spray array (7), an electromagnetic coil (8) and a liquid collecting tank (4); the electromagnetic coil (8) is arranged in the spray cavity (12); the gap between the spray cavity (12) and the shell (1) is a liquid inlet tank (6); the liquid inlet tank (6) is a wedge-shaped structure; the inner wall of the liquid inlet tank (6) is fixed to the shell (1); an array of nozzles (7) distributed at equal distances is arranged on the inner side of the liquid inlet tank (6); the nozzle array (7) is vertically welded to the liquid inlet tank (6); one end of the side wall of the shell (1) is connected to a liquid inlet pipe section (2), and the liquid inlet pipe section (2) is connected to the top of the shell (1); one end of the shell (1) is connected to a liquid collecting tank (4), and the liquid collecting tank (4) is fixed to the bottom of the shell (1); one end of the side wall of the liquid collecting tank (4) is connected to a liquid outlet pipe section (5), The liquid outlet pipe section (5) is connected to a refrigeration device; a flow valve (14) and a flow meter (13) are installed on the liquid inlet pipe section (2); the liquid inlet pipe section (2) is connected to a liquid storage tank (11) and a working fluid pump (10); a hole is opened in the middle of each of the two ends of the shell (1) for inlet and outlet connection of the two ends of the electromagnetic coil (8); the vacuum pump exhaust pipe (15) is sealed and connected to the top of the shell (1), and a pressure gauge (16) is installed on the vacuum pump exhaust pipe (15); the nozzle array (7) has a plurality of nozzles arranged in a ring shape, and the nozzles are all facing the electromagnetic coil (8) to ensure that the spray droplets evenly cover the surface of the electromagnetic coil; the two ends of the shell (1) are arc-shaped structures; the liquid inlet pipe section (2) is vertically sealed and connected to one end of the shell (1), and the liquid outlet pipe section (5) is vertically sealed and connected to the liquid collecting tank (4); the cross-sectional area of ​​the liquid inlet tank (6) gradually decreases in a direction away from the liquid inlet pipe section (2).

2. The spray cooling device for cooling electromagnetic coils according to claim 1, characterized in that: A sealing rubber seal is used at the connection between the liquid inlet pipe section (2) and the working fluid pump (10).

3. The spray cooling device for cooling electromagnetic coils according to claim 1, characterized in that: The liquid inlet pipe section (2) is connected to the working fluid pump (10) using a flexible joint.

4. The spray cooling device for cooling electromagnetic coils according to claim 1, characterized in that: The liquid inlet and outlet pipe sections are made of seamless corrosion-resistant material.

5. The spray cooling device for cooling electromagnetic coils according to claim 1, characterized in that: The liquid inlet and outlet pipe sections, the liquid collecting tank (4), the liquid storage tank (11), and the shell (1) are all provided with heat insulation measures.

Images