Cooling device for improving stability of vacuum melting power supply

Abstract

The utility model provides a cooling device for improving the stability of vacuum melting power supplies, which comprises a plate heat exchanger, a cooling tower, a water tank, a water purifier and two water pumps, the number of the melting power supplies is two, hot water outlets of the melting power supplies are both connected with a hot water inlet of the plate heat exchanger, and a water outlet of the cooling tower is connected with a cold water inlet of the plate heat exchanger. A cold water outlet of the plate heat exchanger is connected with a water inlet of the water tank, a hot water outlet of the plate heat exchanger is connected with a water inlet of the cooling tower, the water purifier is connected with the water tank and used for supplying water to the water tank, and water inlets of the two water pumps are both connected with the water tank. Water outlets of the two water pumps are connected with cold water inlets of the two smelting power sources, and the two water pumps are always kept in a one-start and one-stop state and can be switched through PLC control when the smelting power sources trip out. The cooling mode that a single water pump supplies double power sources and the cooling mode that one water pump is standby and the other water pump is used can be achieved, the two water pumps are switched in turn to work, and the probability of water pump faults is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of nonferrous metal smelting, and in particular relates to a cooling device for improving the stability of vacuum smelting power supply. Background Art

[0002] Titanium alloys are widely used in the aerospace industry due to their high strength, high heat resistance, and good corrosion resistance. High-temperature titanium alloy ingots with better high-temperature and oxidation corrosion resistance are obtained by adding rare metals such as niobium, chromium, molybdenum, and tantalum to sponge titanium through vacuum melting. The preparation of high-performance titanium alloys undergoes three vacuum arc melting processes, and titanium alloy ingots with uniform composition are obtained through purification and degassing. The three melting processes are all carried out in a vacuum consumable arc furnace, and a high-power melting power supply provides energy for the arc furnace during this process.

[0003] The domestic arc furnace melting current is 25-40kA, which is provided by two melting power supplies. The melting time is 4-9 hours. The power supply equipment will generate a lot of heat when outputting a large current for a long time. Using cooling water circulation to remove heat is an ideal cooling method. Traditional water cooling equipment adopts the "single water pump for single power supply" mode. Each of the two melting power supplies is equipped with a water pump. At the same time, the heat exchange node is "return water through plate exchange", that is, the water output of the melting power supply directly returns to the water tank. The water pump injects the water in the water tank into the plate heat exchanger for heat exchange with the external circulating water, and then enters the melting power supply through the pipeline for cooling. This cooling mode has obvious disadvantages. First, water cooling equipment usually runs uninterruptedly. "Single water pump supplies single power supply" requires two water pumps to run continuously for 24 hours. Failure of any water pump will cause the smelting power supply it supplies to trip, which will lead to smelting interruption and scrapping of ingots. At the same time, it also puts a great test on the stability of power supply operation and the life of the water pump. Second, when heat exchange is carried out in the plate heat exchanger, the flow rate of cooling water will slow down, which will directly affect the cooling effect, and it will also make the water pipe joints inside the power supply prone to blockage and the water temperature will continue to rise. At the same time, it is extremely difficult to troubleshoot and repair. Utility Model Content

[0004] The purpose of the utility model is to provide a cooling device for improving the stability of the vacuum smelting power supply. By transforming the existing "single water pump supplying a single power supply" cooling structure, a cooling mode of "single water pump supplying dual power supplies" and "one standby and one use" of the water pump can be realized. The two water pumps work in turn and serve as backup for each other, thereby reducing the probability of water pump failure, extending its service life, and further improving the operating stability of the smelting power supply during the vacuum smelting process. No new equipment is required, the transformation cost is low, and it is easy to install and popularize.

[0005] The technical solution adopted by the utility model is a cooling device for improving the stability of vacuum smelting power supply, comprising a plate heat exchanger, a cooling tower, a water tank, a pure water machine and two water pumps, the smelting power supply has two and the hot water outlets thereof are both connected to the hot water inlet of the plate heat exchanger, the water outlet of the cooling tower is connected to the cold water inlet of the plate heat exchanger, the cold water outlet of the plate heat exchanger is connected to the water inlet of the water tank, the hot water outlet of the plate heat exchanger is connected to the water inlet of the cooling tower, the pure water machine is connected to the water tank for supplying water to the water tank, the water inlets of the two water pumps are both connected to the water tank, the water outlets of the two water pumps are both connected to the cold water inlets of the two smelting power supplies, the two water pumps always maintain a start-stop state and can be switched when the smelting power supply trips through PLC control.

[0006] Furthermore, a liquid level gauge is installed on the water tank.

[0007] Furthermore, a water pressure gauge is provided at the water outlet of the water pump.

[0008] Furthermore, water temperature meters are installed at the hot water outlet and the cold water inlet of the smelting power supply.

[0009] Furthermore, a cooling fan is installed on the top of the cooling tower.

[0010] Furthermore, manual butterfly valves are installed at the cold water inlet and hot water outlet of the smelting power supply, the cold water inlet and hot water outlet of the plate heat exchanger, and the water inlet of the water pump.

[0011] The beneficial effects of the utility model are:

[0012] The utility model proposes a cooling device for improving the stability of the vacuum smelting power supply. The cooling device needs to transform the existing "single water pump supplying single power supply" cooling structure, and can realize the cooling mode of "single water pump supplying dual power supplies" and "one backup and one use" of water pumps. The two water pumps switch to work in turn and serve as backup for each other, thereby reducing the probability of water pump failure, extending its service life, and further improving the operating stability of the smelting power supply during the vacuum smelting process. No new equipment is required, the transformation cost is low, and it is easy to install and popularize. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Explanation of the reference numerals: 1. Plate heat exchanger; 2. Water tank; 3. Liquid level meter; 4. Water pump; 5. Pure water machine; 6. Cooling tower; 7. Solenoid valve flow meter; 8. Manual butterfly valve; 9; Water pressure gauge; 10. Water temperature gauge; 11. Cooling fan; 12. Pipeline; 13. Melting power supply. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the utility model clearer and more understandable, the technical solution of the utility model will be further described in detail below with reference to the accompanying drawings.

[0016] like Figure 1 As shown, the utility model provides a cooling device for improving the stability of vacuum smelting power supply, including a plate heat exchanger 1, a cooling tower 6, a water tank 2, a water purifier 5 and two water pumps 4. There are two smelting power supplies 13 and their hot water outlets are connected to the hot water inlet of the plate heat exchanger 1, the water outlet of the cooling tower 6 is connected to the cold water inlet of the plate heat exchanger 1, the cold water outlet of the plate heat exchanger 1 is connected to the water inlet of the water tank 2, the hot water outlet of the plate heat exchanger 1 is connected to the water inlet of the cooling tower 6, the water purifier 5 is connected to the water tank 2 to supply water to the water tank 2, the water inlets of the two water pumps 4 are connected to the water tank 2, the water outlets of the two water pumps 4 are connected to the cold water inlets of the two smelting power supplies 13, the two water pumps 4 always maintain a start-stop state and can be switched when the smelting power supply 13 trips through PLC control.

[0017] The hot water generated by the smelting power supply 13 flows out from its hot water outlet, flows into the hot water inlet of the plate heat exchanger 1 after passing through the pipe 12, the external circulation water of the cooling tower 6 flows out from its outlet, flows into the cold water inlet of the plate heat exchanger 1 after passing through the pipe 12, the cooling water after completing the heat exchange flows out from the cold water outlet of the plate heat exchanger 1, flows into the water inlet of the water tank 2 after passing through the pipe 12, and the external circulation water flows out from the hot water outlet of the plate heat exchanger 1, flows into the water inlet of the cooling tower 6 after passing through the pipe 12.

[0018] An electromagnetic valve flowmeter 7 is installed on the pipe 12 connecting the pure water machine 5 and the water tank 2, and a liquid level meter 3 is installed on the water tank 2 to monitor the water level of the cooling water in the water tank 2. When the water level is low, an alarm is issued and the electromagnetic valve flowmeter 7 is automatically triggered to inject the pure water produced by the pure water machine 5 into the water tank 2 until the water level in the water tank 2 reaches a predetermined position and stops.

[0019] The two water pumps 4 are used to pump out the cooling water in the water tank 2 and transport it to the smelting power supply 13, and only one water pump 4 is working at any time to pump the cooling water to the two smelting power supplies 13 at the same time, and the working status of the two water pumps 4 can be switched through PLC control when the smelting power supply 13 trips, so that a working mode of one backup and one use, one start and one stop is always maintained. The two water pumps 4 switch to work in turn and serve as backup for each other, and share the cooling task evenly.

[0020] Specifically, the operation of water pump 4 requires the corresponding AC contactor to be energized. In PLC, the AC contactor of water pump 4 is controlled by the programming method of "single button start and stop", and the AC contactors corresponding to the two water pumps 4 are interlocked, that is, the two water pumps 4 cannot work at the same time. When water pump 1 stops running, the normally closed contact of its AC contactor is closed, so that the coil of the AC contactor of water pump 2 4 is energized, and water pump 2 starts running. Similarly, when water pump 2 stops running, water pump 1 can also start running. The falling edge signal of the tripping of the smelting power supply 13 causes the state of the AC contactor of one water pump 4 to change, and the automatic switching of water pump 4 can be completed.

[0021] The smelting power supply 13 has requirements for the temperature difference between the inlet and outlet of the cooling water. For this reason, water temperature meters 10 are installed at the hot water outlet and the cold water inlet of the smelting power supply 13 to monitor the temperature; a water pressure meter 9 is also provided at the outlet of the water pump 4 to monitor the water pressure.

[0022] A cooling fan 11 is installed on the top of the cooling tower 6. In the cooling tower 6, the external circulating water dissipates heat by contacting with the air flow. In order to enhance the cooling capacity, the cooling fan 11 can further cool the external circulating water.

[0023] Manual butterfly valves 8 are installed at the cold water inlet and hot water outlet of the smelting power supply 13, the cold water inlet and hot water outlet of the plate heat exchanger 1, and the water inlet of the water pump 4. In the event of any accident, the manual butterfly valve 8 can be manually closed to prevent the fault from spreading.

[0024] All the pipes 12 mentioned above are preferably stainless steel pipes 12, which can prevent scale from being generated due to rust of the pipes 12, thereby preventing the pipes 12 from being blocked or affecting the cooling efficiency.

[0025] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. A cooling device for improving the stability of vacuum melting power supply, characterized in that: It includes a plate heat exchanger, a cooling tower, a water tank, a water purifier and two water pumps. There are two smelting power supplies and their hot water outlets are connected to the hot water inlet of the plate heat exchanger, the water outlet of the cooling tower is connected to the cold water inlet of the plate heat exchanger, the cold water outlet of the plate heat exchanger is connected to the water inlet of the water tank, the hot water outlet of the plate heat exchanger is connected to the water inlet of the cooling tower, the water purifier is connected to the water tank to supply water to the water tank, the water inlets of the two water pumps are connected to the water tank, the water outlets of the two water pumps are connected to the cold water inlets of the two smelting power supplies, the two water pumps always maintain a start-stop state and can be switched when the smelting power supply trips through PLC control.

2. The cooling device for improving the stability of vacuum melting power supply according to claim 1, characterized in that: A liquid level gauge is arranged on the water tank.

3. The cooling device for improving the stability of vacuum melting power supply according to claim 1, characterized in that: A water pressure gauge is arranged at the water outlet of the water pump.

4. The cooling device for improving the stability of vacuum melting power supply according to claim 1, characterized in that: Water temperature meters are installed at the hot water outlet and cold water inlet of the smelting power supply.

5. The cooling device for improving the stability of vacuum melting power supply according to claim 1, characterized in that: A cooling fan is installed on the top of the cooling tower.

6. The cooling device for improving the stability of vacuum melting power supply according to claim 1, characterized in that: Manual butterfly valves are installed at the cold water inlet and hot water outlet of the smelting power supply, the cold water inlet and hot water outlet of the plate heat exchanger, and the water inlet of the water pump.

Images