Cooling system

Abstract

The utility model provides a cooling system, the cooling system is used for cooling a vacuum casting mold, the cooling system comprises a liquid nitrogen storage tank used for supplying liquid nitrogen to the mold; the first pressurizing pipeline is communicated with the liquid nitrogen storage tank, and the first pressurizing pipeline is used for supplying gas obtained after the liquid nitrogen is vaporized to the liquid nitrogen storage tank; the first pressurizing pipeline is communicated with the liquid nitrogen storage tank, the second pressurizing pipeline is communicated with the liquid nitrogen storage tank, the mold is arranged between the liquid nitrogen storage tank and the second pressurizing pipeline, and the second pressurizing pipeline is used for supplying gas generated after cooling of the mold to the liquid nitrogen storage tank. The liquid nitrogen is supplied to the mold, compared with the mode that water is supplied to the mold for cooling, the cooling effect is more obvious, the mold is prevented from being damaged, by arranging the first pressurizing pipeline and the second pressurizing pipeline, the flow speed of the liquid nitrogen entering the mold is higher, and then the heat exchange efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of vacuum casting, in particular to a cooling system. Background Art

[0002] At present, vacuum casting is widely used in the manufacture of some rare earth metal and alloy targets, and the cooling method usually used is water-cooled mold. The water cooling method requires a large amount of water, so the cooling efficiency is low when the water pressure is insufficient. In addition, due to the poor heat absorption capacity of water cooling itself, a large amount of water is required, so the water after heat absorption needs to be processed, which leads to high cooling costs and more complicated use. At the same time, coarse grains will be produced due to insufficient cooling during the solidification process; for rare earth alloy targets such as aluminum scandium and aluminum yttrium, it will also cause the problem of precipitated phase agglomeration and segregation. In addition, when casting metals with higher melting points such as yttrium, scandium, dysprosium and other metals, insufficient cooling will cause local damage and leakage of the mold, posing certain safety hazards. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a cooling system to overcome the defects of poor water cooling effect and long cooling time in the prior art of vacuum casting.

[0004] The utility model solves the above technical problems through the following technical solutions:

[0005] A cooling system, which is used to cool a vacuum casting mold, comprises:

[0006] A liquid nitrogen storage tank, the liquid nitrogen storage tank is used to supply liquid nitrogen to the mold;

[0007] a first pressurizing pipeline, the first pressurizing pipeline being in communication with the liquid nitrogen storage tank, and the first pressurizing pipeline being used to supply the vaporized gas of the liquid nitrogen to the liquid nitrogen storage tank;

[0008] A second boosting pipeline is connected to the liquid nitrogen storage tank, the mold is arranged between the liquid nitrogen storage tank and the second boosting pipeline, and the second boosting pipeline is used to supply the liquid nitrogen storage tank with gas generated after the mold is cooled.

[0009] In this solution, by supplying liquid nitrogen to the mold, the cooling effect is more obvious than supplying water to the mold for cooling, which can prevent the mold from being damaged by the casting due to poor cooling effect. At the same time, the use rate of liquid nitrogen is less than that of water cooling, so that the cooling system does not need to occupy too much space, and the use rate of liquid nitrogen for cooling is also greatly reduced, reducing the cost of use. In addition, by setting the first boosting pipeline and the second boosting pipeline, the liquid nitrogen flow rate entering the mold is faster, the mold needs less preparation time for casting, and the response is faster, thereby improving the heat exchange efficiency and reducing the time required for casting.

[0010] Preferably, one end of the first boosting pipeline is connected to the bottom of the liquid nitrogen storage tank, and the other end of the first boosting pipeline is connected to the top of the liquid nitrogen storage tank. The first boosting pipeline also includes a first solenoid valve and a vaporizer. The first solenoid valve is electrically connected to a control panel of the cooling system. Before the liquid nitrogen storage tank is used to supply liquid nitrogen to the mold, the first solenoid valve is opened and supplies gas to the liquid nitrogen storage tank through the vaporizer.

[0011] In this solution, through the above-mentioned arrangement, the pressure in the liquid nitrogen storage tank is increased through the first boosting pipeline before supplying liquid nitrogen to the mold, and the above-mentioned function is realized through the control panel to improve the automation degree of the cooling system.

[0012] Preferably, the cooling system also includes a gas tank, the liquid nitrogen storage tank is connected to the mold through a pipeline, the mold is located between the liquid nitrogen storage tank and the gas tank, and the mold and the gas tank are connected through a pipeline, the gas tank is used to store the gas generated after the mold is cooled, and the second boosting pipeline is arranged between the gas tank and the liquid nitrogen storage tank.

[0013] In this solution, through the above arrangement, the gas tank can collect the gas that absorbs heat and vaporizes after passing through the mold, and introduce the gas into the liquid nitrogen storage tank to increase the pressure in the liquid nitrogen storage tank again.

[0014] Preferably, the gas tank is provided with an exhaust pipe, a third solenoid valve and a pressure sensor, the third solenoid valve is provided on the exhaust pipe, the third solenoid valve and the pressure sensor are both electrically connected to the control board, the pressure sensor is used to detect the pressure in the gas tank, when the pressure in the gas tank is higher than a preset value, the exhaust pipe is opened through the third solenoid valve.

[0015] In this solution, the above-mentioned settings are used to improve the safety of the cooling system during casting and avoid safety problems caused by excessive pressure.

[0016] Preferably, the pressure sensor is arranged on the second boost pipe, and a second solenoid valve is also arranged on the second boost pipe. The second solenoid valve is electrically connected to the control board. When the pressure in the gas tank is lower than or equal to a preset value, the second boost pipe is opened through the second solenoid valve.

[0017] In this solution, through the above-mentioned setting, the second boosting pipeline can automatically supply gas and boost pressure into the liquid nitrogen storage tank without manual operation, which is more convenient.

[0018] Preferably, a temperature sensor is provided on the mold, the temperature sensor is electrically connected to the control board, and the temperature sensor is used to detect the temperature inside the mold.

[0019] In this solution, through the above settings, it is possible to detect in real time whether the temperature in the mold has reached the required temperature for pouring.

[0020] Preferably, the mold is located at the bottom of the part to be cast, and the mold comprises an inlet and an outlet, wherein the inlet is connected to the liquid nitrogen storage tank, and the outlet is connected to the gas tank.

[0021] In this solution, the above arrangement is used to effectively cool the bottom of the part to be cast.

[0022] Preferably, a spiral partition is arranged in the mold around the axial direction, and the inlet is arranged coaxially with the axial direction of the mold and is connected to the partition.

[0023] In this solution, through the above arrangement, the liquid nitrogen entering the mold can flow in an orderly manner and gradually diffuse outward from the axial direction of the mold to cool down. The partition plays a role in transferring heat, so that the bottom of the casting can be cooled quickly.

[0024] Preferably, the mold further includes heat dissipation fins, and the heat dissipation fins are arranged in the partition, and a plurality of the heat dissipation fins are provided.

[0025] In this solution, the above-mentioned configuration is adopted to further enhance the heat transfer effect of the partition.

[0026] Preferably, the mold is made of pure copper.

[0027] In this solution, the above-mentioned settings are used to achieve better heat conduction and heat dissipation effects of the mold.

[0028] The positive progress of the utility model is that the utility model supplies liquid nitrogen to the mold, which has a more obvious cooling effect than supplying water to the mold for cooling, and can avoid the mold being damaged by the casting due to poor cooling effect. At the same time, the use rate of liquid nitrogen is less than that of water cooling, so that the cooling system does not need to occupy too much space, and the use rate of liquid nitrogen for cooling is also greatly reduced, reducing the cost of use. In addition, by setting the first boosting pipeline and the second boosting pipeline, the liquid nitrogen flow rate entering the mold is faster, the mold needs less preparation time to be cast, and the response is faster, thereby improving the heat exchange efficiency and reducing the time required for casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The figure is a schematic structural diagram of a cooling system according to a preferred embodiment of the present invention.

[0030] Figure 2 This is a three-dimensional diagram of a mold according to a preferred embodiment of the present invention.

[0031] Figure 3 This is a diagram showing the position relationship between the partition and the heat dissipation fins of a preferred embodiment of the utility model.

[0032] Description of reference numerals:

[0033] Liquid nitrogen storage tank 1

[0034] First booster pipe 2

[0035] First solenoid valve 21

[0036] Carburetor 22

[0037] Second booster pipe 3

[0038] Second solenoid valve 31

[0039] Control Panel 4

[0040] Gas Tank 5

[0041] Exhaust pipe 51

[0042] The third solenoid valve 52

[0043] Pressure sensor 53

[0044] Mold 6

[0045] Support tube 61

[0046] Import 62

[0047] Exit 63

[0048] Partition 64

[0049] Heat sink fin 65

[0050] Temperature sensor 7 DETAILED DESCRIPTION

[0051] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0052] This embodiment provides a cooling system, the specific structure is as follows Figure 1 As shown, the cooling system is used to cool the vacuum casting mold 6, and the cooling system includes:

[0053] A liquid nitrogen storage tank 1, which is used to supply liquid nitrogen to the mold 6;

[0054] A first pressurizing pipeline 2, the first pressurizing pipeline 2 is connected to the liquid nitrogen storage tank 1, and the first pressurizing pipeline 2 is used to supply gas after vaporization of liquid nitrogen to the liquid nitrogen storage tank 1;

[0055] The second boosting pipeline 3 is connected to the liquid nitrogen storage tank 1, the mold 6 is arranged between the liquid nitrogen storage tank 1 and the second boosting pipeline 3, and the second boosting pipeline 3 is used to supply the liquid nitrogen storage tank 1 with gas generated after the mold 6 is cooled.

[0056] Specifically, the liquid nitrogen storage tank 1 is a closed tank body wrapped with an insulating material on the outside, and the first boosting pipe 2 and the second boosting pipe 3 both include pipelines, which are pipes in the prior art that are connected to the liquid nitrogen storage tank 1 and supply liquid nitrogen. This is the prior art and will not be described in detail here. Among them, the liquid nitrogen is supplied to the mold 6 through the liquid nitrogen storage tank 1, and the cooling effect is more obvious compared to the method of supplying water to the mold 6 for cooling, which can avoid the mold 6 being damaged by the casting due to poor cooling effect. At the same time, the use rate of liquid nitrogen is less than that of water cooling, so that the cooling system does not need to occupy too much space, and the use rate of liquid nitrogen for cooling is also greatly reduced, reducing the use cost.

[0057] In addition, the first boosting pipe 2 is connected to the liquid nitrogen storage tank 1 and when the liquid nitrogen flows into the first boosting pipe 2, the first boosting pipe 2 can vaporize the liquid nitrogen to form a gas and introduce it into the liquid nitrogen storage tank 1 again. For example, the liquid nitrogen in the first boosting pipe 2 is in contact with the external environment, so that the liquid nitrogen absorbs heat and vaporizes and introduces the generated gas into the liquid nitrogen storage tank 1. Compared with the liquid nitrogen storage tank 1 without a boosting structure, the pressure in the liquid nitrogen storage tank 1 with the first boosting pipe 2 is higher, so that when the liquid nitrogen storage tank 1 supplies liquid nitrogen to the mold 6, the flow rate of the liquid nitrogen is faster, thereby improving the cooling effect of the mold. The second boosting pipeline 3 is connected to the liquid nitrogen storage tank 1, and when the liquid nitrogen flows into the second boosting pipeline 3, it must first flow through the mold 6. The mold 6 cools the part to be cast, so that the liquid nitrogen flowing into the second boosting pipeline 3 also absorbs heat and vaporizes, and the gas is introduced into the liquid nitrogen storage tank 1. Compared with a single boosting pipeline, the pressure in the liquid nitrogen storage tank 1 is increased by increasing the number of boosting pipelines, so that the flow rate of the liquid nitrogen entering the mold 6 is faster, the preparation time for the mold 6 to reach the required temperature for casting is shorter, the response is faster, and the heat exchange efficiency is improved, and the time required for casting is reduced.

[0058] In this embodiment, one end of the first boosting pipeline 2 is connected to the bottom of the liquid nitrogen storage tank 1, and the other end of the first boosting pipeline 2 is connected to the top of the liquid nitrogen storage tank 1. The first boosting pipeline 2 also includes a first solenoid valve 21 and a vaporizer 22. The first solenoid valve 21 is electrically connected to the control board 4 of the cooling system. Before the liquid nitrogen storage tank 1 is used to supply liquid nitrogen to the mold 6, the first solenoid valve 21 is opened and supplies gas to the liquid nitrogen storage tank 1 through the vaporizer 22.

[0059] Specifically, the first solenoid valve 21 and the vaporizer 22 are both arranged on the pipeline of the first boosting pipeline 2. The first solenoid valve 21 and the vaporizer 22 are structures in the prior art and are not described in detail here. Liquid nitrogen flows from the bottom of the liquid nitrogen storage tank 1 to the top of the liquid nitrogen storage tank 1 through the first boosting pipeline 2. The first solenoid valve 21 and the vaporizer 22 are arranged in sequence, that is, when the liquid nitrogen flows, it first contacts the first solenoid valve 21. The first solenoid valve 21 is electrically connected to the control board 4 to receive the signal of the control board 4 and open or close the first solenoid valve 21. Only when the first solenoid valve 21 is opened can the liquid nitrogen continue to flow to the vaporizer 22. The control board 4 in this embodiment is a prior art, and its principle has not been improved, so it is not described in detail here.

[0060] It should be noted that the first solenoid valve 21 is used to open before the liquid nitrogen storage tank 1 is used to supply liquid nitrogen to the mold 6. That is to say, before the liquid nitrogen storage tank 1 supplies liquid nitrogen to the mold 6, the first solenoid valve 21 is opened to allow the liquid nitrogen in the liquid nitrogen storage tank 1 to flow into the first boosting pipeline 2, and then absorb heat through the vaporizer 22 and form gas after heat exchange between the liquid nitrogen and the vaporizer 22, and then introduce the gas into the liquid nitrogen storage tank 1 to pressurize the liquid nitrogen storage tank 1 before supplying liquid nitrogen to the mold 6 for cooling, so as to ensure that the initial flow rate of the liquid nitrogen entering the mold 6 is higher. The above functions are realized by the control board 4 to improve the degree of automation of the cooling system.

[0061] Of course, in other embodiments, the control board 4 can also be a controller, and its purpose is also to be electrically connected to the structure in the cooling system through wires to open or close the structure accordingly to improve the degree of automation. This is a prior art and will not be elaborated on here.

[0062] Furthermore, the cooling system also includes a gas tank 5, the liquid nitrogen storage tank 1 is connected to the mold 6 through a pipeline, the mold 6 is located between the liquid nitrogen storage tank 1 and the gas tank 5, and the mold 6 is connected to the gas tank 5 through a pipeline, the gas tank 5 is used to store the gas generated after the mold 6 is cooled, and the second boosting pipeline 3 is arranged between the gas tank 5 and the liquid nitrogen storage tank 1.

[0063] Specifically, the gas tank 5 is also a closed tank body, and the mold 6 is located between the liquid nitrogen storage tank 1 and the gas tank 5. The mold 6 is used to receive liquid nitrogen and cool the mold 6 itself to achieve heat exchange cooling in contact with the part to be cast. First, the liquid nitrogen with a faster flow rate is pressurized into the liquid nitrogen storage tank 1 through the first boosting pipe 2 to flow into the mold 6. It can be understood that the liquid nitrogen flowing into the mold 6 is a gas-liquid mixture, so that after the mold 6 reaches a preset temperature, the part to be cast begins to be cast to achieve cooling during vacuum casting, and at the same time, the mold will not be damaged by the part to be cast due to poor cooling effect. The liquid nitrogen that passes through the mold 6 absorbs heat and vaporizes after heat exchange with the casting to form a gas, which flows into the gas tank 5 through a pipeline for storage. In addition, a second boosting pipeline 3 is arranged between the gas tank 5 and the liquid nitrogen storage tank 1 to introduce the gas vaporized after passing through the mold 6 into the liquid nitrogen storage tank 1 again through the second boosting pipeline 3. Compared with a single boosting pipeline, the pressure in the liquid nitrogen storage tank 1 is increased by increasing the number of boosting pipelines, so that the flow rate of the liquid nitrogen entering the mold 6 is faster, and there is no need to set up an additional gas source to supply gas for boosting in the liquid nitrogen storage tank 1. The gas generated by the cooling of the mold 6 is reasonably utilized to save the use cost.

[0064] In this embodiment, an exhaust pipe 51, a third solenoid valve 52 and a pressure sensor 53 are provided on the gas tank 5. The third solenoid valve 52 is provided on the exhaust pipe 51. The third solenoid valve 52 and the pressure sensor 53 are both electrically connected to the control board 4. The pressure sensor 53 is used to detect the pressure in the gas tank 5. When the pressure in the gas tank 5 is higher than a preset value, the exhaust pipe 51 is opened through the third solenoid valve 52.

[0065] Specifically, the exhaust pipe 51 is connected to the discharge pipe (not shown in the figure), and the discharge pipe is used to treat the exhaust gas generated after cooling. This is a prior art and will not be described in detail here. The exhaust pipe 51 is connected to the gas tank 5, and a third solenoid valve 52 is provided on the exhaust pipe 51. The third solenoid valve 52 is electrically connected to the control board 4. The gas tank 5 is also provided with a pressure sensor 53. The pressure sensor 53 is a sensor for detecting air pressure in the prior art. The pressure sensor 53 is electrically connected to the control board 4. The pressure sensor 53 is used to detect the pressure of the gas in the gas tank 5, so as to transmit a signal to the control board 4 when the pressure reaches a preset value. The control board 4 connects the third solenoid valve 52 so that the gas with a relatively high pressure in the gas tank 5 can be discharged from the exhaust pipe 51, thereby ensuring the safety of the use of the gas tank 5 and the liquid nitrogen storage tank 1 and avoiding safety problems caused by excessive pressure.

[0066] Moreover, in this embodiment, the pressure sensor 53 is arranged on the second boost pipe 3, and a second solenoid valve 31 is also arranged on the second boost pipe 3. The second solenoid valve 31 is electrically connected to the control board 4. When the pressure in the gas tank 5 is lower than or equal to a preset value, the second boost pipe 3 is opened through the second solenoid valve 31.

[0067] Specifically, the second boosting pipeline 3 is a pipeline, one end of which is connected to the gas tank 5, and the other end of which is connected to the liquid nitrogen storage tank 1. The pressure sensor 53 is arranged at the connection point between the pipeline and the gas tank 5, and the second solenoid valve 31 is arranged between the pressure sensor 53 and the liquid nitrogen storage tank 1. The second solenoid valve 31 is electrically connected to the control board 4, so that when the pressure in the gas tank 5 is lower than or equal to a preset value, the second solenoid valve 31 opens the second boosting pipeline 3, so that the gas in the gas tank 5 flows into the liquid nitrogen storage tank 1 through the second boosting pipeline 3, so as to realize the cooperation between the first boosting pipeline 2 and the second boosting pipeline 3, further increase the pressure in the liquid nitrogen storage tank 1, and make the liquid nitrogen flow rate to the mold 6 faster.

[0068] It can be understood that both the first boosting pipeline 2 and the second boosting pipeline 3 are opened through the control panel 4 to realize automatic gas supply and pressurization into the liquid nitrogen storage tank 1, which does not require manual operation and is more convenient.

[0069] like Figure 2 and Figure 3As shown, in this embodiment, a temperature sensor 7 is provided on the mold 6, and the temperature sensor 7 is electrically connected to the control board 4. The temperature sensor 7 is used to detect the temperature inside the mold 6. The temperature sensor 7 is a sensor used to detect temperature in the prior art, and will not be described in detail here. Among them, a support tube 61 is provided on the side of the mold 6, and the support tube 61 is provided with a hole for accommodating the temperature sensor 7, so that the temperature measuring end of the temperature sensor 7 can be extended into the mold 6 to detect in real time whether the temperature inside the mold 6 reaches the required temperature for pouring, and accurate temperature measurement is achieved. The temperature sensor 7 is electrically connected to the control board 4 to provide feedback to the operator when the temperature of the mold 6 reaches the pouring condition after the liquid nitrogen is supplied by the liquid nitrogen storage tank 1. The feedback method can adopt the sound and light prompts in the prior art, or the valve body electrically connected to the control board 4 is connected to it and the vacuum casting material flows out.

[0070] In this embodiment, the mold 6 is located at the bottom of the part to be cast, and the mold 6 includes an inlet 62 and an outlet 63 , wherein the inlet 62 is connected to the liquid nitrogen storage tank 1 , and the outlet 63 is connected to the gas tank 5 .

[0071] Specifically, the inlet 62 is located at the bottom of the mold 6 so that the mold 6 can be located at the bottom of the part to be cast and cool it down. The outlet 63 is located at the side of the mold 6 and is arranged opposite to the support tube 61 to avoid interference with the support tube 6. The liquid nitrogen flows into the mold 6 from the inlet 62 and fills the mold 6 to reduce the temperature of the mold 6. When the pouring temperature is reached, the pouring begins. At this time, the liquid nitrogen exchanges heat with the part to be cast and forms gas. The gas flows into the gas tank 5 from the outlet 63, and flows into the second boosting pipe 3 through the gas tank 5 to achieve re-pressurization of the liquid nitrogen storage tank 1.

[0072] In this embodiment, a spiral partition 64 is disposed in the mold 6 around the axial direction, and the inlet 62 is coaxially disposed with the axial direction of the mold 6 and communicated with the partition 64 .

[0073] Specifically, the dimension of the partition 64 along the thickness direction of the mold 6 is consistent with that of the mold 6. The partition 64 presents a spiral structure from the axial direction of the mold 6 to the edge of the mold 6. The inlet 62 is located in the axial direction of the mold 6 and is connected to the partition 64. The partition 64 extends to the outlet 63 to guide the flow direction of the liquid nitrogen when it enters the mold 6. Compared with the disordered flow of liquid nitrogen in the mold 6 without the partition 64, the partition 64 flows circumferentially along the spiral structure, so that when the mold 6 absorbs heat, the heat dissipation direction is from the axial direction of the mold 6 to the edge of the mold 6, such as the circumferential direction, and gradually diffuses outward for cooling. The partition plays a role in transferring heat, avoiding heat concentration in the axial direction of the mold 6, and damaging the mold 6 at high temperature, so that the bottom of the casting can be quickly cooled.

[0074] In this embodiment, the mold 6 further includes heat dissipation fins 65 . The heat dissipation fins 65 are disposed in the partition 64 , and a plurality of the heat dissipation fins 65 are provided.

[0075] Specifically, the heat dissipation fins 65 extend along the thickness direction of the mold 6, and the partition 64 is in a spiral structure to form a gap between multiple circles of partitions 64 in the mold 6, and the heat dissipation fins 65 are arranged in the gap to fill the gap. The plurality of heat dissipation fins 65 are arranged at intervals along the radial direction of the mold 6 so that liquid nitrogen can flow through each heat dissipation fin 65. It can be understood that after being cooled by liquid nitrogen, the plurality of heat dissipation fins 65 arranged at intervals along the radial direction of the mold 6 form a cooling unit that gradually diffuses outward from the axial direction of the mold 6, so as to quickly transfer heat to the edge of the mold 6, realize rapid heat exchange, and further enhance the heat transfer effect of the partition 64.

[0076] In this embodiment, the material of the mold 6 is pure copper. It is understandable that the partition 64 and the heat dissipation fins 65 are also made of pure copper, which has better heat conduction and heat dissipation effects than other metal materials, so as to further improve the cooling effect during vacuum casting, reduce the phenomenon of coarse grains during the solidification process of the casting, and avoid the problem of precipitated phase agglomeration and segregation for rare earth alloy targets such as aluminum scandium and aluminum yttrium. In addition, when casting metals with higher melting points such as yttrium, scandium, dysprosium and other metals, local damage to the mold 6 is prevented, thereby improving the safety of use.

[0077] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A cooling system for cooling a vacuum casting mold, characterized in that: The cooling system comprises: A liquid nitrogen storage tank, the liquid nitrogen storage tank is used to supply liquid nitrogen to the mold; a first pressurizing pipeline, the first pressurizing pipeline being in communication with the liquid nitrogen storage tank, and the first pressurizing pipeline being used to supply the vaporized gas of the liquid nitrogen to the liquid nitrogen storage tank; A second boosting pipeline is connected to the liquid nitrogen storage tank, the mold is arranged between the liquid nitrogen storage tank and the second boosting pipeline, and the second boosting pipeline is used to supply the liquid nitrogen storage tank with gas generated after the mold is cooled.

2. The cooling system according to claim 1, characterized in that One end of the first boosting pipeline is connected to the bottom of the liquid nitrogen storage tank, and the other end of the first boosting pipeline is connected to the top of the liquid nitrogen storage tank. The first boosting pipeline also includes a first solenoid valve and a vaporizer. The first solenoid valve is electrically connected to the control board of the cooling system. Before the liquid nitrogen storage tank is used to supply liquid nitrogen to the mold, the first solenoid valve is opened and supplies gas to the liquid nitrogen storage tank through the vaporizer.

3. The cooling system according to claim 2, characterized in that The cooling system also includes a gas tank, the liquid nitrogen storage tank is connected to the mold through a pipeline, the mold is located between the liquid nitrogen storage tank and the gas tank, and the mold and the gas tank are connected through a pipeline, the gas tank is used to store the gas generated after the mold is cooled, and the second boosting pipeline is arranged between the gas tank and the liquid nitrogen storage tank.

4. The cooling system according to claim 3, characterized in that The gas tank is provided with an exhaust pipe, a third solenoid valve and a pressure sensor. The third solenoid valve is provided on the exhaust pipe. The third solenoid valve and the pressure sensor are both electrically connected to the control board. The pressure sensor is used to detect the pressure in the gas tank. When the pressure in the gas tank is higher than a preset value, the exhaust pipe is opened through the third solenoid valve.

5. The cooling system according to claim 4, characterized in that The pressure sensor is arranged on the second boost pipe, and a second solenoid valve is also arranged on the second boost pipe. The second solenoid valve is electrically connected to the control board. When the pressure in the gas tank is lower than or equal to a preset value, the second boost pipe is opened through the second solenoid valve.

6. The cooling system according to claim 5, characterized in that The mold is provided with a temperature sensor, the temperature sensor is electrically connected to the control board, and the temperature sensor is used to detect the temperature inside the mold.

7. The cooling system according to claim 6, characterized in that The mold is located at the bottom of the part to be cast, and the mold includes an inlet and an outlet, wherein the inlet is connected to the liquid nitrogen storage tank, and the outlet is connected to the gas tank.

8. The cooling system according to claim 7, characterized in that A spiral partition is arranged in the mold around the axial direction, and the inlet is arranged coaxially with the axial direction of the mold and is communicated with the partition.

9. The cooling system according to claim 8, characterized in that The mold also includes heat dissipation fins, which are arranged in the partition and are provided in plurality.

10. The cooling system according to claim 6, characterized in that The material of the mold is pure copper.

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