Cooling water circulation system and cooling method of vacuum suspension smelting furnace

Abstract

The invention discloses a cooling water circulation system and a cooling method of a vacuum suspension smelting furnace, and the cooling water circulation system comprises a cooling-water machine, a normal-temperature purified water tank, a low-temperature purified water tank, a normal-temperature muddy water tank, a first refrigeration pipeline, a second refrigeration pipeline, a normal-temperature purified water circulation pipeline, a low-temperature purified water circulation pipeline and a normal-temperature muddy water circulation pipeline, a set of refrigeration unit is arranged in the cooling-water machine; the first refrigeration pipeline starts from the cooling-water machine; and the second refrigeration pipeline starts from the cooling-water machine. According to the cooling water circulation system provided by the invention, only one refrigeration unit is used, three cooling circulations of low-temperature purified water, normal-temperature purified water and normal-temperature muddy water can be provided at the same time, the requirements of different parts are met, it is guaranteed that cooling water of different water qualities does not affect one another in the circulation process, cross contamination is avoided, and the cooling efficiency is improved; the overall structure of the equipment is simplified, the maintenance cost is reduced, and the reliability and stability of the system are improved.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum smelting, and in particular to a cooling water circulation system and a cooling method for a vacuum suspension smelting furnace. Background Art

[0002] The vacuum suspension melting furnace is an important equipment in modern metallurgical technology. It is mainly used for melting high-purity metal materials. Its working principle is to heat the metal to a molten state in a vacuum environment and achieve efficient melting through suspension technology. In this process, temperature control and cooling systems are crucial because high temperatures are generated during the melting process, and different components have different requirements for cooling water.

[0003] The suspension crucible is the main source of heat. Its operating temperature is extremely high, its structure is complex, and its cooling pipeline is narrow. Therefore, low-temperature pure water is required, which helps to effectively reduce the temperature of the crucible surface and prevent the material from overheating and affecting the smelting effect. The distance between the two electrodes of the coaxial electrode is relatively close. Using pure water for cooling helps to avoid accidental discharge between the electrodes, thereby ensuring the safety and stability of the smelting process. The electronic components in the suspension power supply and load cabinet are relatively complex. Excessive humidity or moisture will cause condensation and affect the normal operation of the components. Therefore, room temperature pure water is required for cooling. Since the vacuum tube pump group and the furnace body contain carbon steel components in their structure, there will be rust in the circulation pipeline. Therefore, it is more appropriate to use room temperature muddy water to reduce corrosion to the equipment.

[0004] Traditional cooling systems are mostly independent cooling water cycles, which leads to complex overall equipment design, water resource waste and difficult management. In addition, the mutual influence and mixing of cooling water between components will lead to unstable equipment operation, increase maintenance costs and reduce equipment efficiency. Summary of the invention

[0005] The main purpose of the present invention is to provide a cooling water circulation system and a cooling method for a vacuum suspension smelting furnace, aiming to provide a cooling water circulation system that can simultaneously meet the different cooling water requirements of various components of the vacuum suspension equipment.

[0006] To achieve the above-mentioned object, the present invention proposes a cooling water circulation system for meeting the different cooling water requirements of various components of the vacuum suspension equipment, including a water chiller, a normal temperature pure water tank, a low temperature pure water tank, a normal temperature muddy water tank, a first refrigeration pipeline, a second refrigeration pipeline, a normal temperature pure water circulation pipeline, a low temperature pure water circulation pipeline and a normal temperature muddy water circulation pipeline, wherein a set of refrigeration units is provided in the water chiller;

[0007] The first refrigeration pipeline starts from the chiller;

[0008] The lower end of the normal temperature pure water tank is provided with two interfaces, one of which is connected to the return pipe of the first refrigeration pipeline, and the other is connected to the water inlet pipe of the normal temperature pure water circulation pipeline. The top of the normal temperature pure water tank is provided with two interfaces, one of which is connected to the water inlet pipe of the first refrigeration pipeline, and the other is connected to the return pipe of the normal temperature pure water circulation pipeline;

[0009] The second refrigeration pipeline starts from the chiller;

[0010] The lower end of the low-temperature pure water tank is provided with two interfaces, one of which is connected to the return pipe of the second refrigeration pipeline, and the other is connected to the water inlet pipe of the low-temperature pure water circulation pipeline. The top of the low-temperature pure water tank is provided with two interfaces, one of which is connected to the water inlet pipe of the second refrigeration pipeline, and the other is connected to the return pipe of the low-temperature pure water circulation pipeline;

[0011] The lower end of the normal temperature muddy water tank is connected to the water inlet of the normal temperature muddy water circulation pipeline, and the top end of the normal temperature muddy water tank is connected to the return pipe of the normal temperature muddy water circulation pipeline.

[0012] Preferably, the cooling water circulation system also includes a tubular heat exchanger, a suspended power supply cabinet, a load cabinet, a coaxial electrode, a suspended crucible, a mechanical pump, a booster pump and a vacuum furnace body, and the tubular heat exchanger is arranged on the return water pipeline of the normal temperature muddy water circulation pipeline.

[0013] Preferably, a solenoid valve is provided at the starting end of the first refrigeration pipeline, a water inlet pipe of the first refrigeration pipeline is connected to the top of the normal temperature pure water tank, and a water return pipe of the first refrigeration pipeline is connected to the chiller;

[0014] The second refrigeration pipeline is provided with two branches, one of which is connected to the top of the low-temperature pure water tank, and the other is connected to the tubular heat exchanger. A solenoid valve is installed at the pipeline branch, and the return water from the two places is merged and returned to the chiller;

[0015] The normal temperature pure water circulation pipeline starts from the normal temperature pure water tank, is divided into water by the water distributor, is connected to the suspended power cabinet and the load cabinet, and its return water returns to the normal temperature pure water tank through the water collector;

[0016] The low-temperature pure water circulation pipeline starts from the low-temperature pure water tank, is divided into water by the water distributor, and is respectively connected to the coaxial electrode and the suspension crucible, and its return water returns to the low-temperature pure water tank through the water collector;

[0017] The normal temperature muddy water circulation pipeline starts from the normal temperature muddy water tank, is divided into water by a water distributor, and is respectively connected to a mechanical pump, a booster pump and a vacuum furnace body, and its return water returns to the normal temperature muddy water tank through a tubular heat exchanger.

[0018] Preferably, the internal circulation pipeline of the chiller is a compressor, a condenser, and an evaporative plate heat exchanger in sequence, and the chiller is intelligently temperature controlled by PLC, specifically comprising the following steps:

[0019] PLC collects various system parameters in real time through temperature sensors and pressure sensors, including condensing temperature, evaporating temperature and water outlet temperature;

[0020] Based on the set temperature range and the actual measured value, the PLC determines whether the chiller needs to start or stop the compressor, or adjust the speed of the condenser fan;

[0021] The PLC controls relays or drivers to regulate the operation of the compressor, condenser fans, and valves to keep the system running optimally.

[0022] Preferably, the top of the normal temperature pure water tank is provided with an inspection port, the middle thereof is provided with a temperature detection port, and the side thereof is provided with a liquid level indicator.

[0023] Preferably, the top of the normal temperature turbid water tank is provided with an inspection port, and the side thereof is provided with a liquid level indicator.

[0024] Preferably, the materials of the normal temperature pure water tank, the low temperature pure water tank and the normal temperature muddy water tank are all 304 stainless steel.

[0025] Preferably, the top of the normal temperature pure water tank is connected to the low temperature pure water tank via a connecting pipe to achieve mutual overflow.

[0026] The present invention also provides a cooling method for a vacuum suspension smelting furnace, which adopts the cooling water circulation system as described above.

[0027] Preferably, the cooling method comprises the following steps:

[0028] S1. Add pure water into the normal temperature pure water tank, and the water filling height is 200mm from the top of the normal temperature pure water tank;

[0029] S2, opening the solenoid valve of the first refrigeration pipeline, and starting the water pumps of the first refrigeration pipeline and the second refrigeration pipeline;

[0030] S3, start the chiller to cool the water in the low-temperature pure water tank to 15°C, open the top branch circulation of the second refrigeration pipeline connected to the low-temperature pure water tank, close the branch circulation connected to the tubular heat exchanger, and close the first refrigeration pipeline;

[0031] S4. Start the circulating water pumps of the normal temperature pure water circulation pipeline, the low temperature pure water circulation pipeline and the normal temperature muddy water circulation pipeline, and check whether each circulation pipeline is normal, including water temperature, water pressure, flow rate and whether there is any blockage;

[0032] S5, start the smelting procedure. The first step is to open the valve of the normal temperature pure water circulation pipeline and start the water pump. The second step is to open the valve of the normal temperature muddy water circulation pipeline and start the water pump. The third step is to open the valve of the low temperature pure water circulation pipeline and start the water pump to supply water to the coaxial electrode and the suspension crucible. After the water circulation is normal, start the suspension power supply cabinet and start smelting.

[0033] S6. During the smelting process, the control system of the chiller will monitor the temperature of the three water tanks in real time, and promptly adjust the opening of the electronically controlled flow valves of each refrigeration pipeline, and automatically balance the flow in the refrigeration pipeline according to the design requirements;

[0034] S6. After the smelting is completed, the normal temperature pure water circulation pipeline and the normal temperature muddy water circulation pipeline stop working, and the low temperature pure water circulation pipeline continues to cool the suspension crucible until the crucible drops to a safe temperature.

[0035] Compared with the prior art, the beneficial effects of the present invention are:

[0036] The cooling water circulation system provided by the present invention uses only one refrigeration unit and can simultaneously provide three cooling cycles of low-temperature pure water, room-temperature pure water and room-temperature turbid water, thereby meeting the needs of different components and ensuring that cooling water of different water quality does not affect each other during circulation, thus avoiding cross contamination and improving cooling efficiency; simplifying the overall structure of the equipment, reducing maintenance costs and improving the reliability and stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0038] Figure 1 It is a schematic structural diagram of an embodiment of a cooling water circulation system of the present invention.

[0039] Description of the accompanying drawings of the embodiments provided by the present invention:

[0040]

[0041]

[0042] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0045] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0046] In view of the complex overall design of traditional cooling system equipment, the waste of water resources and the difficulty in management, the present invention proposes a cooling water circulation system 100, referring to Figure 1 , Figure 1 1 is a schematic structural diagram of an embodiment of a cooling water circulation system of the present invention. The cooling water circulation system 100 will be described in detail below in conjunction with the accompanying drawings.

[0047] In the embodiment of the present invention, Figure 1As shown, the cooling water circulation system 100 is used to meet the different cooling water requirements of various components of the vacuum suspension equipment, including a chiller 1, a normal temperature pure water tank 2, a low temperature pure water tank 3, a normal temperature muddy water tank 4, a first refrigeration pipeline 5, a second refrigeration pipeline 6, a normal temperature pure water circulation pipeline 7, a low temperature pure water circulation pipeline 8 and a normal temperature muddy water circulation pipeline 9. A set of refrigeration units is arranged in the chiller 1; the first refrigeration pipeline 5 starts from the chiller 1; the lower end of the normal temperature pure water tank 2 is provided with two interfaces, one of which is connected to the return pipe of the first refrigeration pipeline 5, and the other is connected to the inlet pipe of the normal temperature pure water circulation pipeline 7; the top of the normal temperature pure water tank 2 is provided with two interfaces, one of which is connected to the return pipe of the first refrigeration pipeline 5, and the other is connected to the inlet pipe of the normal temperature pure water circulation pipeline 7. One is an inlet pipe of a refrigeration pipeline 5, and the other is connected to the return pipe of a normal temperature pure water circulation pipeline 7; preferably, the interface is a flange interface; the second refrigeration pipeline 6 starts from the chiller 1; the lower end of the low-temperature pure water tank 3 is provided with two interfaces, one of which is connected to the return pipe of the second refrigeration pipeline 6, and the other is connected to the inlet pipe of the low-temperature pure water circulation pipeline 8, and the top of the low-temperature pure water tank 3 is provided with two interfaces, one of which is connected to the inlet pipe of the second refrigeration pipeline 6, and the other is connected to the return pipe of the low-temperature pure water circulation pipeline 8; the lower end of the normal temperature turbid water tank 4 is connected to the water inlet of the normal temperature turbid water circulation pipeline 9, and the top of the normal temperature turbid water tank 4 is connected to the return pipe of the normal temperature turbid water circulation pipeline 9.

[0048] The present invention adopts a chiller 1 and three independent water tanks for low-temperature pure water, room-temperature pure water and room-temperature muddy water to ensure that each component can obtain the required appropriate cooling water, meet the specific requirements of different components such as the suspension crucible 15, coaxial electrode 14, load cabinet 16, mechanical pump 11, booster pump 12 and vacuum furnace body 13 for cooling water, thereby improving the working efficiency and life of the overall equipment. By integrating a chiller 1 and a plurality of water tanks, the present invention simplifies the structure of the entire cooling circulation system, reduces the complexity of the pipelines, makes installation, maintenance and operation management more convenient and efficient, and reduces the engineering implementation cost of the system; the cooling water system provided by the present invention can better control the temperature of various types of cooling water by setting independent cooling water circulation pipelines, avoid the influence of water temperature fluctuations on the cooling effect, especially for components that require strict temperature control, such as the suspension crucible 15 and the coaxial electrode 14, and can effectively prevent failures caused by overheating or overcooling; the present invention adopts independent water tanks and circulation pipelines to respectively process low-temperature pure water, room-temperature pure water and room-temperature turbid water, avoids the mixing of different water qualities, and ensures the purity and performance of each type of water in specific applications; this design not only protects the equipment, but also extends the service life of the equipment.

[0049] See also Figure 1Preferably, the cooling water circulation system 100 also includes a tubular heat exchanger 10, a suspended power supply cabinet 17, a load cabinet 16, a coaxial electrode 14, a suspended crucible 15, a mechanical pump 11, a booster pump 12 and a vacuum furnace body 13. The tubular heat exchanger 10 is arranged on the return water pipeline of the normal temperature muddy water circulation pipeline 9. This arrangement enables the tubular heat exchanger 10 to effectively extract heat from the return water flowing through, so that the return water temperature is reduced and the cooling efficiency is improved. By adjusting the return water temperature, the stability of the cooling water temperature can be effectively maintained, the unstable equipment performance caused by temperature fluctuations can be avoided, and the normal operation of the vacuum suspension equipment can be effectively maintained.

[0050] For further information, please refer to Figure 1 , a solenoid valve is provided at the starting end of the first refrigeration pipeline 5, the water inlet pipe of the first refrigeration pipeline 5 is connected to the top of the normal temperature pure water tank 2, and the return pipe of the first refrigeration pipeline 5 is connected to the chiller 1; the second refrigeration pipeline 6 is provided with two branches, one of which is connected to the top of the low temperature pure water tank 3, and the other is connected to the tubular heat exchanger, and a solenoid valve is installed at the pipeline branch, and the return water from the two places is merged and returned to the chiller 1; the normal temperature pure water circulation pipeline 7 starts from the normal temperature pure water tank 2, and a valve and a water pump are provided on the pipeline, and the water is divided by the water distributor, and connected to the suspended The return water of the floating power cabinet 17 and the load cabinet 16 returns to the normal temperature pure water tank 2 through the water collector; the low temperature pure water circulation pipeline 8 starts from the low temperature pure water tank 3, and is provided with valves and water pumps on the pipeline. The water is divided by the water distributor and connected to the coaxial electrode 14 and the suspension crucible 15 respectively. The return water returns to the low temperature pure water tank 3 through the water collector; the normal temperature muddy water circulation pipeline 9 starts from the normal temperature muddy water tank 4, and is provided with valves and water pumps on the pipeline. The water is divided by the water distributor and connected to the mechanical pump 11, the booster pump 12 and the vacuum furnace body 13 respectively. The return water returns to the normal temperature muddy water tank 4 through the tubular heat exchanger. The key equipment such as the floating power cabinet 17, the load cabinet 16, the coaxial electrode 14 and the suspension crucible 15 are connected respectively through the normal temperature pure water circulation pipeline 7 and the low temperature pure water circulation pipeline 8, ensuring the specific cooling water temperature required by the equipment, thereby effectively preventing the equipment from overheating and improving the stability and service life of the equipment.

[0051] In order to accurately control the water temperature of each pipeline, the internal circulation pipeline of the chiller 1 is a compressor, a condenser, and an evaporative plate heat exchanger in sequence. The chiller 1 uses PLC intelligent temperature control, which specifically includes the following steps: PLC collects various system parameters in real time through temperature sensors and pressure sensors, including condensation temperature, evaporation temperature, and outlet water temperature; according to the set temperature range and actual measurement value, PLC determines whether the chiller 1 needs to start or stop the compressor, or adjust the speed of the condenser fan; PLC controls the operation of the compressor, condenser fan, and valve by controlling the relay or driver to keep the system in the optimal operating state. If the outlet water temperature is higher than the set value, PLC can send a signal to start the compressor and adjust the fan to speed up heat dissipation; if the set condensation temperature is reached, PLC will stop the compressor to avoid over-refrigeration.

[0052] Please refer to Figure 1 Preferably, the top of the normal temperature pure water tank 2 is provided with an inspection port, the middle of the tank is provided with a temperature detection port, and the side of the tank is provided with a liquid level indicator. The top of the normal temperature muddy water tank 4 is provided with an inspection port, and the side of the tank is provided with a liquid level indicator. Designing an inspection port at the top of the water tank can facilitate regular inspection, cleaning and maintenance, thereby ensuring the hygiene and normal function of the water tank; the middle of the tank is provided with a temperature detection port to monitor the water temperature in the water tank in real time; the liquid level indicator is set on the side, which can clearly display the remaining water in the water tank, so as to facilitate the grasp of water level changes at any time.

[0053] Preferably, the materials of the room temperature pure water tank 2, the low temperature pure water tank 3 and the room temperature muddy water tank 4 are all 304 stainless steel. The use of 304 stainless steel in each water tank can make the water tank less prone to rust or rot, keep the water pure, and extend the service life of the water tank.

[0054] For further information, please refer to Figure 1 The top of the normal temperature pure water tank 2 is connected to the low temperature pure water tank 3 through a connecting pipe to achieve mutual overflow. This design not only improves the utilization efficiency of water resources and the automation of the system, but also improves temperature regulation and equipment operation efficiency.

[0055] The present invention further proposes a cooling method for a vacuum suspension smelting furnace. The cooling method for the vacuum suspension smelting furnace adopts the cooling water circulation system 100. The specific structure of the cooling water circulation system 100 refers to the above embodiment. Since the cooling method for the vacuum suspension smelting furnace adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.The cooling method of the vacuum suspension smelting furnace comprises the following steps: S1, adding pure water to the normal temperature pure water tank 2, and the water filling height is 200 mm from the top of the normal temperature pure water tank 2; S2, opening the solenoid valve of the first refrigeration pipeline 5, and starting the water pumps of the first refrigeration pipeline 5 and the second refrigeration pipeline 6; S3, starting the chiller 1, cooling the water in the low-temperature pure water tank 3 to 15°C, the top branch circulation of the second refrigeration pipeline 6 connected to the low-temperature pure water tank 3 is opened, the branch circulation connected to the tubular heat exchanger is closed, and the first refrigeration pipeline 5 is closed; S4, starting the normal temperature pure water circulation pipeline, the low temperature pure water circulation pipeline and the normal temperature The circulating water pump of the muddy water circulation pipeline checks whether each circulation pipeline is normal, including water temperature, water pressure, flow rate and whether there is any blockage; S5, start the smelting program, the first step is to open the valve of the normal temperature pure water circulation pipeline 7, start the water pump, this pipeline is responsible for the water supply of the suspended power cabinet 17 and the load cabinet 16, the return water of each branch in the suspended power cabinet 17 and the load cabinet 16 is installed with a temperature detection element, and the water temperature of each road is circulated and detected, especially the inverter branch of the suspended power cabinet 17 and the medium frequency transformer water outlet in the load cabinet 16, which is the key heating unit, the second step is to open the valve of the normal temperature muddy water circulation pipeline 9, start the water pump, and its cooling target is mainly vacuum Pump group and furnace body, when the pressure, temperature and flow of muddy water circulation are normal, you can add furnace charge, close the vacuum chamber, start the vacuum program, and the third step is to open the valve of the low-temperature pure water circulation pipeline 8, start the water pump, supply water to the coaxial electrode 14 and the suspension crucible 15, and after the water circulation is normal, start the suspension power supply cabinet 17 and start smelting; S6, during the smelting process, the control system of the chiller 1 will monitor the temperature of the three water tanks in real time, and timely adjust the opening of the electric control flow valve of each refrigeration pipeline, and automatically balance the flow in the refrigeration pipeline according to the design requirements; Among them, the specific method for real-time detection of each return water temperature is: when the temperature of the room temperature pure water tank 2 reaches When the temperature reaches 55°C, the valve of the first refrigeration pipeline 5 opens automatically, and low-temperature cold water enters the normal temperature pure water tank 2 to cool the water tank. At this time, the water volume in the normal temperature pure water tank 2 will increase. When its water level reaches the overflow height, it overflows to the low-temperature pure water tank 3. When the temperature of the normal temperature muddy water tank 4 reaches 55°C, the branch valve of the second refrigeration pipeline 6 opens automatically, and the cold water reaches the tubular heat exchanger 10 on the return pipe of the muddy water tank through the branch to cool the muddy water tank. S6. After the smelting is completed, the normal temperature pure water circulation pipeline 7 and the normal temperature muddy water circulation pipeline 9 stop working, and the low-temperature pure water circulation pipeline 8 continues to cool the suspension crucible 15 until the crucible drops to a safe temperature.

[0056] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A cooling water circulation system, characterized in that: The water chiller (1) comprises a normal temperature pure water tank (2), a low temperature pure water tank (3), a normal temperature muddy water tank (4), a first refrigeration pipeline (5), a second refrigeration pipeline (6), a normal temperature pure water circulation pipeline (7), a low temperature pure water circulation pipeline (8) and a normal temperature muddy water circulation pipeline (9), wherein a set of refrigeration units is arranged in the water chiller (1); The first refrigeration pipeline (5) starts from the chiller (1); The lower end of the normal temperature pure water tank (2) is provided with two interfaces, one of which is connected to the return pipe of the first refrigeration pipeline (5), and the other is connected to the inlet pipe of the normal temperature pure water circulation pipeline (7); the top of the normal temperature pure water tank (2) is provided with two interfaces, one of which is connected to the inlet pipe of the first refrigeration pipeline (5), and the other is connected to the return pipe of the normal temperature pure water circulation pipeline (7); The second refrigeration pipeline (6) starts from the chiller (1); The lower end of the low-temperature pure water tank (3) is provided with two interfaces, one of which is connected to the return pipe of the second refrigeration pipeline (6), and the other is connected to the inlet pipe of the low-temperature pure water circulation pipeline (8); the top of the low-temperature pure water tank (3) is provided with two interfaces, one of which is connected to the inlet pipe of the second refrigeration pipeline (6), and the other is connected to the return pipe of the low-temperature pure water circulation pipeline (8); The lower end of the normal temperature muddy water tank (4) is connected to the water inlet of the normal temperature muddy water circulation pipeline (9), and the top end of the normal temperature muddy water tank (4) is connected to the return pipe of the normal temperature muddy water circulation pipeline (9).

2. The cooling water circulation system according to claim 1, characterized in that: The cooling water circulation system further comprises a tubular heat exchanger (10), a suspended power supply cabinet (17), a load cabinet (16), a coaxial electrode (14), a suspended crucible (15), a mechanical pump (11), a booster pump (12) and a vacuum furnace body (13); the tubular heat exchanger (10) is arranged on the return water pipeline of the normal temperature muddy water circulation pipeline (9).

3. The cooling water circulation system according to claim 2, characterized in that: A solenoid valve is provided at the starting end of the first refrigeration pipeline (5); a water inlet pipe of the first refrigeration pipeline (5) is connected to the top of the normal temperature pure water tank (2); and a water return pipe of the first refrigeration pipeline (5) is connected to the chiller (1); The second refrigeration pipeline (6) is provided with two branches, one of which is connected to the top of the low-temperature pure water tank (3), and the other is connected to the tubular heat exchanger (10). A solenoid valve is installed at the pipeline branch, and the return water from the two places is combined and returned to the chiller (1); The normal temperature pure water circulation pipeline (7) starts from the normal temperature pure water tank (2), is divided into water by a water distributor, and is connected to the suspended power supply cabinet (17) and the load cabinet (16), and its return water returns to the normal temperature pure water tank (2) through a water collector; The low-temperature pure water circulation pipeline (8) starts from the low-temperature pure water tank (3), is divided into water by a water distributor, and is respectively connected to the coaxial electrode (14) and the suspension crucible (15), and its return water returns to the low-temperature pure water tank (3) through a water collector; The normal temperature muddy water circulation pipeline (9) starts from the normal temperature muddy water tank (4), is divided into water by a water distributor, and is respectively connected to a mechanical pump (11), a booster pump (12) and a vacuum furnace body (13), and its return water returns to the normal temperature muddy water tank (4) through a tubular heat exchanger.

4. The cooling water circulation system according to claim 1, characterized in that: The internal circulation pipeline of the chiller (1) is a compressor, a condenser, and an evaporative plate heat exchanger in sequence. The chiller (1) is controlled by PLC intelligent temperature control, specifically comprising the following steps: PLC collects various system parameters in real time through temperature sensors and pressure sensors, including condensing temperature, evaporating temperature and water outlet temperature; Based on the set temperature range and the actual measured value, the PLC determines whether the chiller (1) needs to start or stop the compressor, or adjust the speed of the condenser fan; The PLC controls relays or drivers to regulate the operation of the compressor, condenser fans, and valves to keep the system running optimally.

5. The cooling water circulation system according to claim 1, characterized in that: The top of the normal temperature pure water tank (2) is provided with an inspection port, the middle thereof is provided with a temperature detection port, and the side thereof is provided with a liquid level indicator.

6. The cooling water circulation system according to claim 1, characterized in that: The top of the normal temperature muddy water tank (4) is provided with an inspection port, and the side thereof is provided with a liquid level indicator.

7. The cooling water circulation system according to claim 1, characterized in that: The materials of the normal temperature pure water tank (2), the low temperature pure water tank (3) and the normal temperature muddy water tank (4) are all 304 stainless steel.

8. The cooling water circulation system according to claim 1, characterized in that: The top end of the normal temperature pure water tank (2) is connected to the low temperature pure water tank (3) via a connecting pipe to achieve mutual overflow.

9. A cooling method for a vacuum suspension melting furnace, characterized in that: A cooling water circulation system as described in any one of claims 1 to 8 is used.

10. The cooling method of the vacuum suspension melting furnace according to claim 9, characterized in that: The following steps are involved: S1, adding purified water into the normal temperature purified water tank (2), the water filling height being 200 mm from the top of the normal temperature purified water tank (2); S2, opening the solenoid valve of the first refrigeration pipeline (5), and starting the water pumps of the first refrigeration pipeline (5) and the second refrigeration pipeline (6); S3, starting the water chiller (1) to cool the water in the low-temperature pure water tank (3) to 15° C., the top branch circulation of the second refrigeration pipeline (6) connected to the low-temperature pure water tank (3) is opened, the branch circulation connected to the tubular heat exchanger is closed, and the first refrigeration pipeline (5) is closed; S4, start the circulating water pumps of the normal temperature pure water circulation pipeline (7), the low temperature pure water circulation pipeline (8) and the normal temperature muddy water circulation pipeline (9), and check whether each circulation pipeline is normal, including water temperature, water pressure, flow rate and whether there is any blockage; S5, start the smelting procedure, the first step is to open the valve of the room temperature pure water circulation pipeline (7) and start the water pump, the second step is to open the valve of the room temperature muddy water circulation pipeline (9) and start the water pump, the third step is to open the valve of the low temperature pure water circulation pipeline (8) and start the water pump to supply water to the coaxial electrode (14) and the suspension crucible (15), after the water circulation is normal, start the suspension power supply cabinet (17) and start smelting; S6. During the smelting process, the control system of the chiller (1) monitors the temperature of the three water tanks in real time, and promptly adjusts the opening of the electronically controlled flow valves of each refrigeration pipeline, and automatically balances the flow in the refrigeration pipeline according to the design requirements; S6. After the smelting is completed, the normal temperature pure water circulation pipeline (7) and the normal temperature muddy water circulation pipeline (9) stop working, and the low temperature pure water circulation pipeline (8) continues to cool the suspension crucible (15) until the crucible drops to a safe temperature.

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