CN220708065U - Cooling system and suspension smelting equipment - Google Patents

Abstract

The utility model designs a cooling system and suspension smelting equipment, and a strong cooling water system with a water chiller is additionally arranged on the basis of a traditional normal-temperature water system and aiming at the requirement that a core component, namely a water-cooled copper crucible, needs to be strongly cooled; the strong cold water system is used for cooling the water-cooled copper crucible assembly and the induction coil, and the normal-temperature water system is used for cooling other parts except the water-cooled copper crucible assembly and the induction coil in the suspension smelting equipment; the strong cold water system is provided with a cold water machine, the cold water machine comprises a cold water machine body, a water supply pipe and a water return pipe, the water inlet end of the water supply pipe is communicated with a water source, and the water outlet end of the water supply pipe is communicated with the cold water machine body; the water inlet end of the water return pipe is communicated with the water chiller body, and the water outlet end of the water return pipe is communicated with a water source. Aiming at the requirement that the water-cooled copper crucible cannot be short in water shortage, a water-preparing pump and an emergency water system are additionally arranged; in order to ensure the safety of the system operation, the circulating water system adopts a closed-circuit mode structure with various sensors.

Description

Cooling system and suspension smelting equipment

Technical Field

The utility model relates to the technical field of smelting and casting equipment, in particular to a cooling system and suspension smelting equipment.

Background

The magnetic suspension smelting technology has been widely used in material development and production, and a water-cooled copper crucible is a core component of the technology. Providing cooling water meeting the requirements for the water-cooled copper crucible is a key element for ensuring the safe operation of the water-cooled copper crucible. Although conventional suspension smelting plants generally build a circulating water system for plant cooling, water-cooled copper crucibles have particularly stringent requirements for cooling water and require significant modifications to the conventional circulating water system.

The cooling water path arranged in the water-cooled copper crucible is the most basic condition for ensuring the crucible to bear high temperature. Because of the existence of the water path, most of the heat of the molten pool is transferred to cooling water in the smelting process, so that the temperature of the cooling water is rapidly increased along with the extension of smelting time until the cooling capacity is lost, and the water-cooled copper crucible is burnt. Particularly, as the size of the crucible increases, the melting point of the material increases, which further leads to the problem of increasing the melting time and increasing the water temperature.

Copper is generally adopted as the material of the water-cooled copper crucible, the melting point of copper is only 1080 ℃, and the temperature of a molten pool is mostly higher than 1080 ℃ and even higher than 2000 ℃ and 3000 ℃, so that the circulation of cooling water of the water-cooled copper crucible cannot be interrupted for a short time in the working process, otherwise, the crucible can be burnt immediately, and the cooling water is mixed with hot molten metal to cause explosion. Accidents such as water pump failure and workshop power failure can lead to the problem that cooling water is interrupted or even lost.

Moreover, during operation of the suspension smelting plant, problems of reduced water pressure, increased water temperature, reduced flow are often encountered, which all pose a risk to the operating efficiency of the cooling system and to the safety with which the water-cooled copper crucible continues to operate.

In addition, the water-cooled copper crucible in the vacuum furnace body can cause disastrous results once cooling water leakage accidents occur in the working process, so that whether leakage state occurs in the vacuum furnace body or not is strictly detected, and treatment measures are timely taken.

Accordingly, there is a need in the art for a cooling system and a suspension smelting apparatus that solves the following technical problems: firstly, the cooling capacity can be greatly enhanced; secondly, emergency water supply measures are provided for the failure of the cooling system; thirdly, monitoring the working state of the cooling system and providing protection measures such as alarm and the like; fourth, there is a means to monitor and handle the leakage of waterways in the vacuum furnace.

Disclosure of Invention

Aiming at the defects existing in the prior art, the utility model designs a cooling system and suspension smelting equipment, and a strong cooling water system with a water chiller is additionally arranged on the basis of the traditional normal-temperature water system and aiming at the requirement that a core component, namely a water-cooled copper crucible, needs to be strongly cooled; aiming at the requirement that the water-cooled copper crucible cannot be short in water shortage, a water-preparing pump and an emergency water system are additionally arranged; in order to ensure the safety of the system operation, the circulating water system adopts a closed-circuit mode structure with various sensors.

The utility model provides a cooling system, which comprises a high-temperature water system and a strong cold water system;

the strong cold water system is used for cooling the water-cooled copper crucible assembly and the induction coil, and the normal-temperature water system is used for cooling other parts except the water-cooled copper crucible assembly and the induction coil in the suspension smelting equipment;

the strong cold water system is provided with a cold water machine, the cold water machine comprises a cold water machine body, a water supply pipe and a water return pipe, the water inlet end of the water supply pipe is communicated with a water source, and the water outlet end of the water supply pipe is communicated with the cold water machine body; the water inlet end of the water return pipe is communicated with the water chiller body, and the water outlet end of the water return pipe is communicated with a water source.

Further, the forced cooling water system comprises a water source, a main water supply pipe, a water separator and a main water return pipe;

the inlet end of the main water supply pipe is communicated with the water outlet end of the water source, the outlet end of the main water supply pipe is communicated with the water inlet end of the water separator, and the main water supply pipe is provided with a main water pump;

the water separator is communicated with the water channel inlets of all the parts to be cooled through a plurality of branch pipes, and the water channel outlets of all the parts to be cooled are communicated with the inlet end of the main water return pipe through a plurality of branch pipes;

the outlet end of the main return pipe is communicated with the water inlet end of the water source.

Furthermore, the inlet end of the emergency water pump is communicated with a water source of the strong cold water system, the outlet end of the emergency water pump is connected with a main water supply pipe through an emergency pipeline, and the position of the emergency pipeline connected with the main water supply pipe is positioned at the downstream of the main water pump;

the main water supply pipe is provided with a normally open check valve, the emergency pipeline is provided with a normally closed check valve, and the normally open check valve and the normally closed check valve are both positioned at the upstream of the position of the emergency pipeline connected with the main water supply pipe.

Furthermore, the tap water pipeline is connected to the main water supply pipe through an emergency pipeline, and the position of the emergency pipeline connected to the main water supply pipe is positioned at the downstream of the main water pump;

the main water supply pipe is provided with a normally open check valve, the emergency pipeline is provided with a normally closed check valve, and the normally open check valve and the normally closed check valve are both positioned at the upstream of the position of the emergency pipeline connected with the main water supply pipe.

Further, the cooling system further comprises a monitoring system, the monitoring system comprises a first temperature sensor configured for the high-temperature water system and a second temperature sensor configured for the strong-cold water system, and the first temperature sensor and the second temperature sensor are respectively arranged on a water return branch of each system or a main water return pipe of each system.

Further, when the value monitored by the first temperature sensor exceeds a first temperature threshold value of the low-temperature water system, the monitoring system sends out an alarm signal to prompt the inspection equipment to eliminate the fault of the low-temperature water system;

when the value monitored by the first temperature sensor exceeds a second temperature threshold value of the low-temperature water system, the monitoring system sends out a protection signal and turns off the induction power supply.

Further, when the value monitored by the second temperature sensor exceeds a first temperature threshold value of the strong cold water system, the monitoring system sends out an alarm signal to prompt the inspection equipment to eliminate the fault of the strong cold water system;

when the value monitored by the second temperature sensor exceeds a second temperature threshold value of the strong cold water system, the monitoring system sends out a protection signal and turns off the induction power supply.

Furthermore, the water supply and return water discharge of the water separator of the strong cold water system are provided with flow meters, the flow rates of the water supply and return water are input into the PLC module of the control system in real time, and the flow rate difference of the water supply and return water is calculated in real time.

Further, when the flow difference of the water supply and the backwater exceeds a first flow difference threshold, the monitoring system sends an alarm signal to remind an operator of timely observing whether leakage exists in the vacuum furnace body or not and timely taking measures;

when the flow difference between the water supply and the backwater exceeds a second flow difference threshold, the induction power supply is automatically turned off, the pressure release valve and the water drain valve of the vacuum furnace body are opened, and meanwhile, a protection signal is sent.

The utility model also provides suspension smelting equipment which comprises a water-cooled copper crucible, an induction power supply, an induction coil, a vacuum furnace body, a vacuum-argon filling system, the cooling system and a control system;

the vacuum-argon filling system is used for vacuumizing the vacuum furnace body, and then high-frequency current output by the induction power supply generates an electromagnetic field in the induction coil to heat materials in the water-cooled copper crucible;

the cooling system supplies cooling water to the water-cooled copper crucible, the induction coil, the vacuum furnace body, the vacuum-inert gas system and the induction power supply, and the equipment is cooled and protected;

after the vacuum furnace body is vacuumized, the vacuum-argon filling system can fill protective gas into the vacuum furnace body;

the control system is provided with a PLC module and is used for automatically controlling the operation of the equipment.

Compared with the prior art, the utility model has the advantages that:

1. the utility model provides a strong cold water system mainly used for the cold crucible for the suspension smelting equipment, and provides reliable guarantee for the safe operation of the cold crucible, and the system is more important under the conditions of increased crucible specification, increased smelting temperature and increased smelting time;

2. in view of the fact that the water supply of the cold crucible cannot be interrupted, the emergency water supply system is arranged for the strong cold water system, emergency temporary water supply is provided when water supply is observed to be interrupted accidentally, reliable guarantee is provided for preventing accidental burning of the crucible, and the emergency water supply has an important role when power failure and water pump failure occur in a workshop;

3. the utility model provides a complete design for monitoring and alarming protection of the cooling state of the equipment, and the design provides reliable guarantee for the safe operation of the suspension smelting equipment;

4. in view of the serious consequences of leakage of cooling water from components in a vacuum chamber such as a cold crucible, the present utility model provides reliable means for monitoring such leakage.

Drawings

FIG. 1 is a normal temperature water system diagram of a cooling system;

FIG. 2 is a diagram of a forced cooling water system according to the present utility model;

FIG. 3 is an emergency water supply design using an emergency water pump;

FIG. 4 is a schematic diagram of an emergency water supply using tap water;

FIG. 5 is a diagram of a waterway monitoring device mounted on a water separator

Reference numerals: 100-normal temperature water system, 1.1-normal temperature water source, 2.1-normal temperature main water pump, 3.1-normal temperature main water supply pipe, 31.1-normal temperature main water supply branch pipe, 32.1-normal temperature standby water supply branch pipe, 4.1-normal temperature water separator, 5.1-normal temperature branch pipe, 51.1-normal temperature water supply branch pipe, 52.1-normal temperature backwater branch pipe, 6.1-normal temperature main backwater pipe, 7.1-normal temperature valve, 8.1-normal temperature filter, 9.1-normal temperature standby water pump, 10.1-normal temperature water supply row, 11.1-normal temperature backwater row, 22.1-pressure gauge, 23.1-temperature gauge, 24.1-pressure sensor, 25.1-second temperature sensor, 26.1-flow switch and 27.1-flow meter;

the water cooling system comprises a strong water cooling system, a 1-water source, a 2-main water pump, a 3-main water supply pipe, a 4-water separator, a 5-branch pipe, a 51-water supply branch, a 52-water return branch, a 6-main water return pipe, a 7-valve, an 8-filter, a 9-standby water pump, a 10-water supply row, a 11-water return row, a 12-water chiller, a 13-water chiller water supply pipe, a 14-water chiller water return pipe, a 15-water cooling tower, a 16-emergency water pump, a 17-emergency pipeline, a 18-UPS power supply, a 19-normally open check valve, a 20-normally closed check valve, a 21-tap water pipeline, a 22-pressure meter, a 23-thermometer, a 24-pressure sensor, a 25-second temperature sensor, a 26-flow switch and a 27-flowmeter.

Detailed Description

With reference to fig. 1, the present embodiment provides a suspension smelting apparatus equipped with a cooling system that includes a suspension smelting apparatus and a cooling system.

In particular, the suspension smelting apparatus includes a water cooled copper crucible, an induction power supply, an induction coil, a vacuum furnace, a vacuum-argon charging system, a cooling system, and a control system.

The vacuum-argon filling system is used for vacuumizing the vacuum furnace body, and then high-frequency current output by the induction power supply generates an electromagnetic field in the induction coil to heat materials in the water-cooled copper crucible.

The cooling system supplies cooling water to the water-cooled copper crucible, the induction coil, the vacuum furnace body, the vacuum-inert gas system and the induction power supply, and the equipment is cooled and protected. After the vacuum furnace is evacuated, the vacuum-argon filling system may fill the vacuum furnace with a protective gas, such as argon. The control system can be provided with a PLC module to automatically control the operation of the equipment.

As shown in fig. 1, the cooling system comprises a normal temperature water system 100, which comprises a normal temperature water source 1.1, a normal temperature main water supply pipe 3.1, a normal temperature water separator 4.1 and a normal temperature main water return pipe 6.1, wherein cooling water is arranged in the normal temperature water source 1.1; the inlet end of the normal temperature main water supply pipe 3.1 is communicated with the water outlet end of the normal temperature water source 1.1, and the outlet end of the normal temperature main water supply pipe 3.1 is communicated with the water inlet end of the normal temperature water separator 4.1; the normal temperature water separator 4.1 is communicated with the waterway inlets of all the parts to be cooled through a plurality of normal temperature branch pipes 5.1 so as to split cooling water to the waterway inlets of all the parts to be cooled, such as a water-cooled copper crucible, an induction power supply, an induction coil, a vacuum furnace body and a vacuum-argon filling system; the waterway outlets of the parts to be cooled are communicated with the inlet ends of the normal-temperature main return water pipes 6.1 through a plurality of normal-temperature branch pipes 5.1 so as to collect the water subjected to heat exchange in the parts to be cooled to the normal-temperature main return water pipes 6.1; the outlet end of the normal temperature main return pipe 6.1 is communicated with the water inlet end of the normal temperature water source 1.1, thereby completing the circulation of cooling water.

In order to accelerate the circulation of cooling water, a normal-temperature main water pump 2.1 is generally arranged on the normal-temperature main water supply pipe 3.1; in order to avoid that impurities in the cooling water influence the normal operation of all parts in the cooling system, a normal temperature filter 8.1 is generally arranged on the normal temperature main water supply pipe 3.1, and the normal temperature filter 8.1 is arranged at the upstream of the normal temperature main water pump 2.1, or the normal temperature filter 8.1 is arranged at the water outlet end of the normal temperature water source 1.1; in order to realize the start and stop of the cooling system, the normal temperature main water supply pipe 3.1 should be generally provided with a normal temperature valve 7.1, and the normal temperature valve 7.1 may be disposed between the normal temperature filter 8.1 and the normal temperature main water pump 2.1, may be disposed between the normal temperature main water pump 2.1 and the normal temperature water separator 4.1, and may be disposed between the normal temperature filter 8.1 and the normal temperature main water pump 2.1 and between the normal temperature main water pump 2.1 and the normal temperature water separator 4.1.

It can be understood that the normal temperature water source 1.1, the normal temperature main water pump 2.1, the normal temperature main water supply pipe 3.1, the normal temperature water separator 4.1, the normal temperature branch pipe 5.1, the normal temperature main water return pipe 6.1, a plurality of matched normal temperature valves 7.1 and normal temperature filters 8.1 form a circulating water system of the cooling system, namely the normal temperature water system 100. The normal temperature water source 1.1 generally adopts a pool, a water tank or a water storage tank and the like; the normal temperature main water pump 2.1 can be selected according to the specific requirements of the suspension smelting equipment on water pressure and flow. The cooling system is often further provided with a heat exchanger that exchanges heat of the inner circulating water of the cooling system with the outer circulating water to reduce the temperature of the inner circulating water.

The normal-temperature water separator 4.1 comprises a normal-temperature water supply row 10.1 and a normal-temperature water return row 11.1, and a water supply interface and a water return interface which are used for connecting the normal-temperature branch pipes 5.1 are respectively arranged on the normal-temperature water supply row 10.1 and the normal-temperature water return row 11.1; the normal temperature branch pipe 5.1 includes a normal temperature water supply branch 51.1 and a normal temperature return branch 52.1 connected from the normal temperature water separator 4.1 to each part to be cooled.

In order to be able to maintain the water supply in the event of a failure of the normal temperature main water pump 2.1, the cooling system often needs to be provided with at least one normal temperature backup water pump 9.1. Specifically, a normal-temperature main water supply pipe 3.1 is branched with a normal-temperature main water supply branch pipe 31.1 and one or more normal-temperature standby water supply branch pipes 32.1, the normal-temperature main water supply branch pipe 31.1 is provided with a normal-temperature main water pump 2.1 and a normal-temperature valve 7.1, and the normal-temperature standby water supply branch pipe 32.1 is provided with a normal-temperature standby water pump 9.1 and a normal-temperature valve 7.1; the normal temperature filter 8.1 is arranged upstream of the diversion of the normal temperature main water supply branch pipe 31.1 and the normal temperature standby water supply branch pipe 32.1.

It should be noted that the cooling system of the conventional suspension smelting apparatus is divided into two types, i.e. an open-circuit mode and a closed-circuit mode, and the present embodiment adopts a structure of the closed-circuit mode. In other words, all waterways including the normal-temperature water source 1.1, the normal-temperature water pumps 2.1 and 3.1, the normal-temperature pipelines 3.1 and 6.1 and the normal-temperature water separator 4.1 are in a closed structure, and the water return system is characterized in that backwater of each normal-temperature branch pipe 5.1 enters the normal-temperature main backwater pipe 6.1 again through a main pipe which is converged into the closed normal-temperature backwater row 11.1, and the water pressure, the water temperature and the flow of backwater of each normal-temperature branch pipe 5.1 are detected by using corresponding types of sensors.

It will be appreciated that during smelting, a substantial portion of the bath heat is transferred to the cooling water of the hot water system 100. However, as the smelting time increases, the temperature of the cooling water will rise rapidly until the cooling capacity is lost, causing the water-cooled copper crucible to burn. Particularly, as the size of the crucible increases, the melting point of the material increases, which further leads to the problem of increasing the melting time and increasing the water temperature.

In order to eliminate the defects, a set of strong cold water system 200 is added to the suspension smelting equipment in the cooling system of the embodiment, and the strong cold water system 200 is specially used for the components in the vacuum furnace body of the suspension smelting equipment, namely, the water-cooled copper crucible assembly and the induction coil, as shown in the accompanying figures 1-2 and 5. The forced cooling water system 200 is equipped with a water chiller based on a conventional cooling system so that the water temperature can be strongly reduced.

In other words, the cooling system of the present embodiment includes the strong cold water system 200 and the strong cold water system 100, wherein the strong cold water system 200 is used for cooling the water-cooled copper crucible assembly and the induction coil, and the normal temperature water system 100 is used for cooling other components of the suspension smelting equipment except for the water-cooled copper crucible assembly and the induction coil.

The strong cold water system 200 has the same core components as the normal temperature water system 100, that is, the strong cold water system 200 also includes a water source 1, a main water pump 2, a main water supply pipe 3, a water separator 4, a branch pipe 5, a main water return pipe 6, and a plurality of matched valves 7 and filters 8, and the connection relationship and functions of the components are the same as those of the normal temperature water system 100.

The water separator 4 also comprises a water supply row 10 and a water return row 11, and the water supply row 10 and the water return row 11 are respectively provided with a water supply interface and a water return interface for connecting each branch pipe 5; the branch pipe 5 includes a water supply branch 51 and a water return branch 52 connected from the water separator 4 to the respective cooling-required parts. In order to be able to maintain the water supply in the event of a failure of the main water pump 2, the cooling system often needs to be provided with at least one backup water pump 9.

Unlike the normal temperature water system 100, the strong cooling water system 200 is equipped with a cooling water machine, so that the water temperature is strongly reduced. Specifically, the water chiller includes a chiller main body 12, a water supply pipe 13, and a water return pipe 14, the medium of the chiller main body 12 is cooled by air cooling or water cooling, and in the water cooling mode, a water cooling tower 15 is required to be provided. The specification of the water chiller is selected according to the power of an induction power supply matched with the water-cooled copper crucible.

It should be noted that, although the chiller may directly cool the components in the vacuum furnace, since the heat release amount of the water-cooled copper crucible assembly is large, a large specification is required to be selected for instantly cooling the water-cooled copper crucible assembly chiller. It is therefore more preferable to cool the water of the water source 1 with a chiller.

In particular, the water temperature of the water source 1 is reduced in advance to a certain temperature value, e.g. to 3-30 c, more preferably to 10-20 c, depending on the amount of caloric material and the melting point, before the suspension smelting apparatus is started. The suspension smelting process is generally fast and can be completed in 5-20 min, and the return water temperature of the cooling water can be controlled below 30 deg.c. In the time interval of starting to continue the next furnace, the water chiller can reduce the water temperature to the required temperature again.

Therefore, compared with a heat exchanger equipped in a traditional cooling system, the heat exchanger can at most reduce the water temperature to be lower than 30 ℃, and the cooling requirement of the water-cooled copper crucible assembly cannot be met. According to the mode, the water chiller can be of smaller specification, and the cooling requirement of the water-cooled copper crucible assembly can be met.

In other words, the water inlet end of the water supply pipe 13 is communicated with the water source 1, and the water outlet end of the water supply pipe 13 is communicated with the water chiller body 12; the water inlet end of the water return pipe 14 is communicated with the water chiller body 12, and the water outlet end of the water return pipe 14 is communicated with the water source 1. Therefore, the water in the water source 1 flows into the water chiller body 12, and after being cooled by the water chiller body 12, flows back to the water source 1, so that the overall temperature of cooling water in the water source 1 is reduced.

With the above arrangement, the cooling system for cooling the components outside the vacuum furnace body can employ the high-temperature water system 100, i.e., a cooling system having a conventional structure. The low temperature water system is mainly used for cooling power supply, transformer, cable, vacuum furnace body and vacuum unit, and these components are not suitable for cooling with strong cold water, because when the water temperature is lower than room temperature, the surfaces of these components are condensed, resulting in discharging and igniting the charged element. The water-cooled copper crucible assembly and the induction coil are positioned in the vacuum furnace body chamber, and the problem of dew condensation is avoided.

The normal temperature water system may be equipped with a water chiller, and particularly when the air temperature is high and the water temperature of the water source 1.1 of the normal temperature water system 100 is too high, the water temperature of the water source 1.1 may be appropriately reduced by the water chiller.

It will be appreciated that the circulation of the cooling water in a water-cooled copper crucible during its operation cannot be interrupted for a short period of time, otherwise the crucible will burn out immediately, causing the cooling water to mix with the hot molten metal and cause an explosion.

In order to eliminate the above-described drawbacks, the cooling system of the present embodiment is further provided with an emergency water supply device for the strong cold water system 200. Therefore, when the water pressure of the main water supply pipe 3 is reduced to a certain low threshold value, the emergency water supply device is automatically started, and meanwhile, the induction power supply for heating the materials in the water-cooled copper crucible is cut off. It should be noted that the emergency water supply can be performed with a small amount of water supply, because the induction power for heating the material is turned off at this time, and the amount of water supply is required only to ensure the cooling process of the material in the water-cooled copper crucible.

As a preferred embodiment, the emergency water supply device adopts an emergency water pump mode as shown in fig. 3. Specifically, the inlet end of the small-sized emergency water pump 16 is communicated with the water source 1 of the strong cold water system 200, the outlet end of the emergency water pump 16 is connected to the main water supply pipe 3 through the emergency pipeline 17, and the position of the emergency pipeline 17 connected to the main water supply pipe 3 is positioned at the downstream of the main water pump 2 and the standby water pump 9; preferably, the emergency water pump 16 may be provided with a UPS power supply 18 to activate the emergency water pump 16; the main water supply pipe 3 is provided with a normally open check valve 19, the emergency pipeline 17 is provided with a normally closed check valve 20, and the normally open check valve 19 and the normally closed check valve 20 are both positioned at the upstream of the position of the emergency pipeline 17 connected with the main water supply pipe 3.

Thus, when the strong cold water system 200 is operating normally, the high water pressure in the main water supply pipe 3 causes the normally closed check valve 20 in the emergency pipe 17 to close; when the water pressure in the main water supply pipe 3 suddenly drops due to a fault, the pressure sensor in the main water supply pipe 3 gives an instruction to cut off the induction power supply, and simultaneously the UPS power supply 18 is turned on to start the emergency water pump 16 to work, at the moment, the water pressure in the emergency pipeline 17 forces the normally closed check valve 20 in the emergency pipeline 17 to open, and the normally open check valve 19 of the main water supply pipe 3 is closed.

As yet another preferred embodiment, as shown in fig. 4, the emergency water supply device adopts a tap water mode. Specifically, the tap water pipe 21 is connected to the main water supply pipe 3 through the emergency pipe 17, and likewise, the position of the emergency pipe 17 connected to the main water supply pipe 3 is also downstream of the main water pump 2 and the backup water pump 9; the main water supply pipe 3 is also provided with a normally open check valve 19, the emergency pipeline 17 is also provided with a normally closed check valve 20, and the normally open check valve 19 and the normally closed check valve 20 are both positioned at the upstream of the position of the emergency pipeline 17 connected with the main water supply pipe 3.

Thus, when the strong cold water system 200 is operating normally, the high water pressure in the main water supply pipe 3 causes the normally closed check valve 20 in the emergency pipe 17 to close; when the water pressure in the main water supply pipe 3 suddenly drops due to a malfunction, the pressure of the tap water forces the normally closed check valve 20 of the emergency pipe 17 to open and the normally open check valve 19 of the main water supply pipe 3 to close. At the same time, the pressure sensor in the main water supply pipe 3 will give out instructions to cut off the induction power supply. Preferably, in order to prevent the tap water from generating water supply in the operation state of the forced water system 200, a valve 7 needs to be disposed between the tap water pipe 21 and the emergency pipe 17, and the valve 7 may be manually, pneumatically or electromagnetically driven.

It should be noted that the emergency water supply devices in the two different modes can be used independently or simultaneously.

With the above arrangement, the cooling system provided with the emergency water supply device according to the present embodiment will play an important role in several occasions: first, occasions that workshop has a power failure. Namely, due to power failure, the water pump stops working, at the moment, the emergency water supply is automatically started, and when the workshop resumes the power supply, the emergency water supply is automatically stopped. And secondly, the situation of water pump failure. That is, when the water pump fails, the water pressure suddenly drops or the water pump stops working, and during the process of overhauling the water pump or starting the standby water pump, the emergency water supply is automatically started. Third, other failure situations. For example, when other components of the cooling system, such as pipes, valves, and water splitters, fail, the emergency water supply is automatically started while checking and troubleshooting.

Referring to fig. 5 in combination, in view of the importance of the cooling system for safe operation of the suspension smelting apparatus, the cooling system of this embodiment also includes a monitoring system that employs various types of sensors to monitor various operating parameters of the water circuit, including water pressure, water temperature, flow rate, etc., to provide an alarm protection design for operation of the suspension smelting apparatus.

Specifically, the monitoring system includes a first temperature sensor 25.1 configured for the normal-temperature water system 100 and a second temperature sensor 25 configured for the strong cold water system 200, and the first temperature sensor 25.1 and the second temperature sensor 25 may be provided on the return branch of the respective systems, or may be provided on the main return pipe of the respective systems. Preferably, the temperature sensor may employ a thermocouple or a resistance thermometer.

Thus, when the value monitored by the first temperature sensor 25.1 exceeds the first temperature threshold value of the low-temperature water system, the monitoring system sends out an alarm signal to prompt the inspection equipment to eliminate the fault of the low-temperature water system 100; when the value monitored by the first temperature sensor 25.1 exceeds the second temperature threshold of the warm water system, the monitoring system sends out a protection signal and turns off the induction power supply. And obviously, when the second temperature threshold value of the normal-temperature water system is larger than the first temperature threshold value of the normal-temperature water system.

Likewise, when the value monitored by the second temperature sensor 25 exceeds the first temperature threshold value of the strong cold water system, the monitoring system sends out an alarm signal to prompt the inspection device to eliminate the fault of the strong cold water system 200; when the value monitored by the second temperature sensor 25 exceeds the second temperature threshold of the strong cold water system, the monitoring system sends out a protection signal and turns off the induction power supply.

It will be appreciated that in general, meters for monitoring waterway parameters of the whole system, such as the first pressure gauge 22.1, the second pressure gauge 22, the first temperature gauge 23.1 and the second temperature gauge 23, are disposed on the water separators or the main water supply pipe and the main water return pipe of the normal temperature water system 100 and the strong cold water system 200. In order to achieve alarm protection, a first pressure sensor 24.1, a second pressure sensor 24, or a first temperature sensor 25.1, a second temperature sensor 25, or a first flow switch 26.1, a second flow switch 26, or a first flow meter 27.1, a second flow meter 27 are also provided, which are able to provide an output signal. To achieve tighter monitoring and alarm protection, monitoring meters and alarm protection are also required for each leg of the strong cold water system 200, as well as for important legs of the warm water system 100, such as power supplies and transformers.

However, since the water-cooled copper crucible and the induction coil in the vacuum furnace are both filled with high-pressure cooling water, once leakage occurs, the water is mixed with the hot molten metal, causing serious accidents, and therefore, whether water leakage occurs in the vacuum furnace or not must be closely observed in the smelting process. The water leakage phenomenon can be monitored by human eyes and camera shooting, but the observation is carried out manually, and unexpected results can occur in case of overlooking during the observation.

In order to eliminate the above problems, the present embodiment provides a monitoring technique for detecting leakage of cooling water in a vacuum furnace. Specifically, the flowmeter 27 is installed in both the water supply row 10 and the water return row 11 of the water separator 4 of the strong cold water system 200, and the flow rates of the water supply and the water return are input into the PLC module of the control system in real time, so that the flow rate difference between the water supply and the water return is calculated in real time. When the flow difference of the water supply and the backwater exceeds a first flow difference threshold value, the monitoring system sends an alarm signal to remind an operator of timely observing whether leakage exists in the vacuum furnace body or not and timely taking measures; when the flow difference between the water supply and the backwater exceeds a second flow difference threshold, the induction power supply is automatically turned off, the pressure release valve and the water drain valve of the vacuum furnace body are opened, and meanwhile, a protection signal is sent. And it is apparent that the second flow difference threshold is greater than the first flow difference threshold.

The present utility model provides some specific embodiments for a better understanding of the present utility model:

example 1:

for a 20 kg-grade suspension smelting plant, 2 sets of circulating cooling water systems-a low-temperature water system and a strong cold water system were provided.

The low temperature water system (figure 1) is used for cooling the induction power supply, the output transformer, the output cable, the copper bars, the vacuum unit and the furnace body. The system comprises 10m ³ The water storage tank 1.1, a filter 8.1, a lift 30m, a centrifugal pump 2.1 with flow rate of 20T/h and power of 5kW, a main water supply pipe 3.1 with caliber of 50mm, a main water return pipe 6.1 and a water separator 4.1 consisting of a water supply row 10.1 and a water return row 11.1. The water supply row is provided with a main valve combined with the main water supply pipe and branch valves combined with each water supply branch; the backwater row is provided with an interface combined with the main backwater pipe and an interface combined with each backwater branch.

The forced cooling water system (FIG. 2) is used for cooling the components in the vacuum chamber, including 2 branches of the cold crucibleA crucible plug and an induction coil. The system comprises 10m ³ The water storage tank 1, the filter 8, the lift 50m, the flow 20T/h, the centrifugal pump 2 with the power of 8kW, the main water supply pipe 3 with the caliber of 50mm, the main water return pipe 6 and the water separator 4 consisting of the water supply row 10 and the water return row 11. The water supply row is provided with a main valve combined with the main water supply pipe and branch valves combined with each water supply branch; the backwater row is provided with an interface combined with the main backwater pipe and an interface combined with each backwater branch.

The system is different from a low-temperature water system in that a water chiller device is additionally arranged. A 10-piece water chiller 12 is connected to the water storage tank 1 of the system, and the water temperature design value of the water chiller is 12 ℃. The cold water machine is started 1 hour before smelting work is carried out, and the water temperature of the water storage tank is reduced to a specified temperature in advance.

The water chiller is also combined with a water storage tank of the warm water, and when the weather is hot and the temperature is high, the temperature of the warm water can be properly reduced by the water chiller. For example, when the air temperature is higher than 30 ℃, the temperature of the water is reduced to 20 ℃ by a water chiller. The water chiller is provided with valves 7 at the water supply interface and the water return interface of the water storage tanks of the two systems for changing the system acted by the chiller.

Example 2

The smelting equipment and cooling system used was substantially the same as in example 1.

This embodiment adds an emergency water supply device (fig. 3) to the forced water system using an emergency water pump. The emergency water pump 16 is a small centrifugal pump with a power of 1kW and is driven by a 5kW UPS power source 18. The emergency pump is connected into the main water supply pipe 3 by an emergency pipeline 17 with the caliber of 32 mm. In front of the joint of the two pipelines, a main water supply pipe and an emergency pipe are respectively connected with a normally-open check valve 19 and a normally-closed check valve 20. When the workshop is in power failure, the UPS automatically starts the emergency water pump to work. At this time, the water pressure in the emergency pipe will force the check valve in the emergency pipe to open, so that the check valve of the main pipe is closed. When the workshop resumes the power supply, the UPS power supply automatic system supplies power to the emergency water pump. At this time, the working water pump is operated again, and the water pressure in the main pipeline can force the check valve in the main water supply pipe to be opened, so that the check valve of the emergency pipeline is closed.

Example 3

The smelting equipment and cooling system used was substantially the same as in example 1.

This embodiment adds an emergency water supply device (fig. 5) for the forced water system using tap water. Tap water 21 is connected to an emergency pipeline 17 with the caliber of 25mm through a manual ball valve 7 and then to a main water supply pipe 3. In front of the joint of the two pipelines, a main water supply pipe and an emergency pipe are respectively connected with a normally-open check valve 19 and a normally-closed check valve 20. The ball valve of the tap water access emergency pipe is opened during operation of the device. When the working water pump runs, the water pressure in the main pipeline forces the check valve in the emergency pipe to be closed; when the workshop is in power failure, the pressure of tap water in the emergency pipe forces the one-way valve in the emergency pipe to be opened, so that the one-way valve of the main pipe is closed. When the workshop resumes the power supply, the working water pump works again, and the water pressure in the main pipeline forces the check valve in the main water supply pipe to open again, so that the check valve of the emergency pipeline is closed. When the equipment stops working, the ball valve of tap water is closed.

Example 4

The smelting equipment and cooling system used was substantially the same as in example 1.

This embodiment provides monitoring meters for water pressure, water temperature and flow rate on the water separator of the cooling system, and designs alarm protection programs for these parameters. In addition to directly observable meters such as the pressure gauge 22 and the temperature gauge 23, a series of meters having an alarm protection function are provided in the present embodiment, such as:

the pressure sensor 24 is arranged in the water supply row of the water separator of the strong cold water system and the normal temperature water system, the first threshold value for the water pressure setting of the strong cold water system is 0.25MPa, and the second threshold value is 0.20MPa; the first threshold value for the water pressure setting of the warm water system is 0.18MPa and the second threshold value is 0.15MPa.

The PT100 temperature sensor 25 is arranged in the backwater row 11 of the water separator of the strong cold water system and the normal temperature water system, and the first threshold value is 40 ℃ and the second threshold value is 50 ℃ for the water temperature of the strong cold water system; the first threshold value for the water temperature setting of the low temperature water system is 45 MPa and the second threshold value is 55 ℃.

A flowmeter 27 is also arranged in the backwater row 11 of the water separator of the strong cold water system and the normal temperature water system, and the first threshold value is 15T/h and the second threshold value is 10T/h for the flow rate of the strong cold water system; the flow threshold for the warm water system is set the same as for the strong cold water.

A flow switch 26 is arranged at the interface of each branch of the backwater rows 11 of the two systems. The interface of each branch of the water supply row 10 of the forced cooling water system is provided with a pressure sensor 24, the interface of each branch of the water return row 11 is provided with a temperature sensor 25, and the threshold value setting of the interfaces is the same as the setting of the main sensors of the water supply row and the water return row. The power supply and the transformer are provided with the measurement of pressure, temperature and flow and alarm protection.

In the above arrangement, the first threshold serves to give an audible and visual alarm signal and the second threshold serves to give an instruction to turn off the inductive power supply.

In order to monitor the state of leakage of cooling water in the vacuum chamber, a flowmeter 27 is also installed in the water supply row 10 of the water separator of the strong cold water, the flow signal measured by the flowmeter and the flow signal measured by the return water row 11 are simultaneously sent to a PLC module of the control system, and the module calculates the flow difference of the water supply and the return water, so as to send out an alarm protection signal of leakage of the cooling water. The first threshold set for the flow difference is 0.5T/h and the second threshold is 0.8T/h. When the flow difference reaches a second threshold value, the control system closes the induction power supply and opens the pressure release valve and the water drain valve of the vacuum chamber.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A cooling system, characterized by comprising a high-temperature water system (100) and a strong cold water system (200);

the strong cold water system (200) is used for cooling the water-cooled copper crucible assembly and the induction coil, and the normal-temperature water system (100) is used for cooling other parts except the water-cooled copper crucible assembly and the induction coil in the suspension smelting equipment;

the strong cold water system (200) is provided with a cold water machine, the cold water machine comprises a cold water machine body (12), a water supply pipe (13) and a water return pipe (14), the water inlet end of the water supply pipe (13) is communicated with the water source (1), and the water outlet end of the water supply pipe (13) is communicated with the cold water machine body (12); the water inlet end of the water return pipe (14) is communicated with the water chiller body (12), and the water outlet end of the water return pipe (14) is communicated with the water source (1).

2. The cooling system according to claim 1, characterized in that the forced cooling water system (200) comprises a water source (1), a main water supply pipe (3), a water separator (4) and a main return pipe (6);

the inlet end of the main water supply pipe (3) is communicated with the water outlet end of the water source (1), the outlet end of the main water supply pipe (3) is communicated with the water inlet end of the water separator (4), and the main water pump (2) is arranged on the main water supply pipe (3);

the water separator (4) is communicated with the water channel inlets of all the parts to be cooled through a plurality of branch pipes (5), and the water channel outlets of all the parts to be cooled are communicated with the inlet end of the main water return pipe (6) through a plurality of branch pipes (5);

the outlet end of the main return pipe (6) is communicated with the water inlet end of the water source (1).

3. The cooling system according to claim 2, characterized in that the inlet end of the emergency water pump (16) is connected with the water source (1) of the forced cooling water system (200), the outlet end of the emergency water pump (16) is connected with the main water supply pipe (3) through an emergency pipeline (17), and the position of the emergency pipeline (17) connected with the main water supply pipe (3) is located at the downstream of the main water pump (2);

a normally open one-way valve (19) is arranged on the main water supply pipe (3), a normally closed one-way valve (20) is arranged on the emergency pipeline (17), and the normally open one-way valve (19) and the normally closed one-way valve (20) are both positioned at the upstream of the position of the emergency pipeline (17) connected with the main water supply pipe (3).

4. A cooling system according to claim 2 or 3, characterized in that the mains water supply pipe (3) is connected to the mains water supply pipe (21) via an emergency pipe (17), the location of the emergency pipe (17) connection to the mains water supply pipe (3) being downstream of the mains water pump (2);

a normally open one-way valve (19) is arranged on the main water supply pipe (3), a normally closed one-way valve (20) is arranged on the emergency pipeline (17), and the normally open one-way valve (19) and the normally closed one-way valve (20) are both positioned at the upstream of the position of the emergency pipeline (17) connected with the main water supply pipe (3).

5. The cooling system according to claim 4, characterized in that the cooling system further comprises a monitoring system comprising a first temperature sensor (25.1) configured for a normal temperature water system (100) and a second temperature sensor (25) configured for a forced cold water system (200), the first temperature sensor (25.1) and the second temperature sensor (25) being arranged on the return water branch of the respective system or on the main return water pipe of the respective system, respectively.

6. The cooling system according to claim 5, characterized in that the monitoring system emits an alarm signal prompting the inspection device to eliminate the fault of the low temperature water system (100) when the value monitored by the first temperature sensor (25.1) exceeds a first temperature threshold value of the low temperature water system;

when the value monitored by the first temperature sensor (25.1) exceeds a second temperature threshold value of the low-temperature water system, the monitoring system sends out a protection signal and turns off the induction power supply.

7. A cooling system according to claim 5 or 6, characterized in that the monitoring system gives an alarm signal when the value monitored by the second temperature sensor (25) exceeds the first temperature threshold of the forced cooling water system, prompting the inspection device to troubleshoot the forced cooling water system (200);

when the value monitored by the second temperature sensor (25) exceeds a second temperature threshold value of the strong cold water system, the monitoring system sends out a protection signal and turns off the induction power supply.

8. The cooling system according to claim 5, wherein the flow meter (27) is installed in both the water supply row (10) and the water return row (11) of the water separator (4) of the forced cooling water system (200), and the flow rates of the water supply and the water return are input into the PLC module of the control system in real time, and the flow rate difference between the water supply and the water return is calculated in real time.

9. The cooling system of claim 8, wherein the monitoring system sends an alarm signal to alert an operator to timely observe whether there is a leak in the vacuum furnace and take action in time when the flow difference between the water supply and the water return exceeds a first flow difference threshold;

when the flow difference between the water supply and the backwater exceeds a second flow difference threshold, the induction power supply is automatically turned off, the pressure release valve and the water drain valve of the vacuum furnace body are opened, and meanwhile, a protection signal is sent.

10. A suspension smelting apparatus comprising a water cooled copper crucible, an induction power supply, an induction coil, a vacuum furnace, a vacuum-argon charging system, a cooling system according to any one of claims 1 to 9, and a control system;

the vacuum-argon filling system is used for vacuumizing the vacuum furnace body, and then high-frequency current output by the induction power supply generates an electromagnetic field in the induction coil to heat materials in the water-cooled copper crucible;

the cooling system supplies cooling water to the water-cooled copper crucible, the induction coil, the vacuum furnace body, the vacuum-inert gas system and the induction power supply, and the equipment is cooled and protected;

after the vacuum furnace body is vacuumized, the vacuum-argon filling system can fill protective gas into the vacuum furnace body;

the control system is provided with a PLC module and is used for automatically controlling the operation of the equipment.