JP3706731B2 - Insulating gas recovery and filling equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an insulating gas recovery and filling device for recovering or filling insulating gas such as SF6 gas from an insulating gas sealing device such as a transformer.
[0002]
[Prior art]
SF6 (sulfur hexafluoride) gas is excellent in heat resistance and electrical insulation, and is sealed as an insulating gas in an insulating gas sealing device such as a transformer. When repairing or checking the insulating gas sealing device, Needs to be recovered from the sealing device.
[0003]
A conventional SF6 gas recovery apparatus sucks an insulating gas in an insulating gas sealing device such as a transformer using a vacuum pump. As this vacuum pump, an oil rotary vacuum pump or an air-cooled vacuum pump is used.
[0004]
[Problems to be solved by the invention]
However, the oil rotary vacuum pump has a problem that SF6 gas is mixed into the oil, and the air-cooled type cannot use a large capacity device because of the storage container. There is a problem that it takes time to recover the gas below atmospheric pressure.
[0005]
There is also a water-cooled vacuum pump, but this pump requires cooling water piping such as tap water, and there is a problem that tap water cannot be secured depending on the location.
[0006]
Furthermore, at normal temperature and normal pressure, the SF6 gas remains as a gas, and since the volume of gas to be recovered is large, there is a problem that the recovery device itself is enlarged, the transport weight is large, and the portability is poor.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems and to provide an insulating gas recovery and filling device that can recover insulating gas satisfactorily and has excellent portability.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a first aspect of the present invention is that a vacuum pump circuit unit comprising a water-cooled vacuum pump that sucks and delivers insulating gas from an insulating gas-sealed device, and a compression circuit that compresses the collected recovery gas. , A liquefaction circuit unit that cools and condenses the compressed recovered gas, a storage tank unit that encloses and stores the liquefied recovered liquid, and heats and vaporizes the recovered liquid sent from the storage tank unit and encloses the insulating gas. The vaporization circuit unit is provided with a vaporizer , and the vaporization circuit unit is provided with a vaporization tank for introducing the collected recovered liquid and a heat transfer coil provided in the vaporization tank. A brine tank is connected to the vaporization tank, and a chiller tank connected to the refrigerator is connected to the brine tank. When flowing through the cooling coil of the empty pump and the heat exchange coil of the liquefaction circuit section, the recovered liquid in the storage tank section is heated and vaporized and sent to the insulation gas-filled equipment, and the hot water heated by the heater provided in the brine tank is transferred This is an insulating gas recovery and filling device supplied to a coil .
[0011]
According to a second aspect of the present invention, there is provided a vacuum pump circuit unit comprising a water-cooled vacuum pump for sucking and sending insulating gas from an insulating gas-sealed device, a compression circuit unit for compressing the sent recovered gas, and a compressed recovered gas A liquefaction circuit unit that cools and condenses and liquefies, a storage tank unit that encloses and stores the liquefied recovered liquid, and a vaporization circuit unit that heats and evaporates the recovered liquid sent from the storage tank unit and sends it to an insulating gas-sealed device. The vaporization circuit unit is provided with a vaporizer, and this vaporizer is composed of a vaporization tank for introducing the collected recovered liquid, and a heat transfer coil provided in the vaporization tank. A hot water tank for supplying hot water is connected to the heat transfer coil, and a brine tank, a chiller tank, and a refrigerator are provided independently of the hot water tank, and the cold water generated in the brine tank is cooled by a vacuum pump. Yl, an insulating gas recovery filling apparatus to flow to the heat exchanger coils of the liquefied circuit portion.
[0012]
The invention according to claim 3 is the insulating gas recovery and filling device according to claim 1 or 2 , wherein the vaporizing circuit section is connected to the insulating gas-sealed device side with a pressure adjusting valve and a dryer for adjusting the filling pressure .
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
[0023]
As shown in FIG. 1, the insulating gas recovery and filling apparatus of the present invention compresses the recovered gas sent from the vacuum pump circuit part A, and the vacuum pump circuit part A that sucks and sends the recovered gas from the insulating gas sealing device. A compression circuit unit B, a liquefied circuit unit C for cooling and condensing the recovered gas compressed in the compression circuit unit B, a storage tank unit D for enclosing and storing the liquefied recovered gas, and an enclosed storage tank circuit D And a vaporizing circuit portion E that heats and vaporizes the recovered gas sent from the gas and sends the gas to an insulating gas-sealed device.
[0024]
Hereinafter, these circuit portions A, B, C, D, and E will be sequentially described.
[0025]
In the vacuum pump circuit part A, an inlet side connection port 12 connected to a connection hose 11 connected to an insulating gas sealing device is formed in the main circuit 10, and the inlet side main valve 13 and the cooling coil 14 are connected to the main circuit 10. A water-cooled vacuum pump 15 and a cushion tank 17 are sequentially connected, and a bypass circuit 18 is connected between the main valve 13 and the cushion tank 17 in parallel with the main circuit 10 of the vacuum pump 15.
[0026]
Flow path switching solenoid valves 19a and 19b are connected to the branch portions of the main circuit 10 and the bypass circuit 18 to constitute a flow path switching means 19, and a pressure gauge 20 for detecting the pressure of SF6 gas upstream thereof. And a pressure switch 21 for opening and closing the flow path switching electromagnetic valves 19a and 19b to switch between the bypass circuit 18 and the main circuit 10 according to the detected gas pressure.
[0027]
A check valve 22 is connected to the downstream side of the vacuum pump 15, a pressure balance electromagnetic valve 23 is connected to the vacuum pump 15, and a pressure gauge 24 is connected to the inlet side of the cushion tank 17.
[0028]
Between the inlet side connection port 12 and the inlet side main valve 13, the main circuit 10 is branched and the main circuit 10 is evacuated by a vacuum pump, or the vaporized gas from the vaporization circuit section E described later is hose 25. The connection port 26 and its stop valve 27 for returning to the insulating gas-sealed device are connected via the.
[0029]
In this vacuum pump circuit part A, when collecting insulating gas from an insulating gas sealing device such as a transformer, the connection hose 11 is connected to the sealing device, and a small vacuum pump (not shown) is connected to the connection port 26. After connecting and evacuating the main circuit 10, the stop valve 27 is stopped, then the inlet side main valve 13 is opened, and the insulating gas is introduced into the main circuit 10 from the inlet side connection port 12. At the initial stage of introduction, since the gas pressure in the sealed device is high, the flow path switching means 19 causes the flow to flow to the bypass circuit 18, and then the flow path switching means 19 if the gas pressure drops to near atmospheric pressure. Then, switching to the main circuit 10 side is performed, and the insulating gas in the enclosed device is recovered by the suction force of the vacuum pump 15.
[0030]
The recovered gas enters the cushion tank 17 and is supplied to the compression circuit B through the decompression device 28.
[0031]
The compression circuit portion B is configured by connecting a strainer 30, a gas compressor 32, an afterstrainer 33, and a check valve 34 to the main circuit 10 in this order.
[0032]
The gas compressor 32 includes a multi-stage compressor including a low-pressure stage compressor 35 and a high-pressure stage compressor 36, an intercooler 37 is connected therebetween, and an after-cooler 38 is connected to the discharge side of the high-pressure stage compressor 36. Is done.
[0033]
A pressure gauge 40 and a low pressure side pressure switch 41 are provided on the suction side of the low pressure stage compression section 35, a pressure gauge 42 is provided on the discharge side of the low pressure stage compression section 35, and a high pressure side pressure gauge 43 is provided on the afterstrainer 33. And a high voltage side switch 44 is provided.
[0034]
In the compression circuit part B, the recovered gas from the vacuum pump circuit part A is compressed to several tens kg / cm ² by the gas compressor part 32 and supplied to the liquefaction circuit part C.
[0035]
The liquefaction circuit unit C is composed of a shell-and-tube heat exchanger 45 connected to the main circuit 10, a check valve 46 is connected to the downstream side thereof, a pressure switch 47 is further connected, and pressure is maintained. The pressure on / off valve 48 is connected, and the pressure switch 47 detects the pressure of the gas liquefying heat exchanger 45 to open and close the pressure holding on / off valve 48 so as to keep the heat exchanger 45 at a predetermined pressure or higher. ing.
[0036]
The gas liquefying heat exchanger 45 is supplied with the recovered gas compressed from the body 49, and condenses the recovered gas with the coil 50 provided in the body 49 to liquefy it to obtain a recovered liquid.
[0037]
The coil 50 and the cooling coil 14 of the vacuum pump 15 of the vacuum pump circuit section A are supplied with cold water produced by a refrigerator 52 described later.
[0038]
The storage tank portion D includes a storage tank 53 that stores the recovered liquid from the liquefying circuit portion C in the main circuit 10, and the recovered liquid is supplied to the storage tank 53 through the upstream pressure holding on-off valve 48. The storage tank 53 is provided with a liquid level gauge 54 and a liquid level switch 55 so that the liquid level of the recovered liquid can be monitored.
[0039]
The vaporization circuit unit E includes an inlet-side opening / closing control valve 60, a check valve 61, a vaporizer 62, an outlet-side opening / closing control valve 63, a pressure adjustment valve 64 for adjusting a filling pressure, a dryer 65, a filter 66, and an outlet. The vaporization circuit section E is configured by connecting the side valve 67.
[0040]
The vaporizer 62 is connected to the main circuit 10, introduces the recovered liquid from the upstream side, and sends the vaporized gas to the downstream side, and heat transfer supplied with hot water provided in the vaporization tank 68. It consists of a coil 69.
[0041]
A brine tank 70 is connected to the heat transfer coil 69, and a heater 71 is provided in the brine tank 70. The brine 71 is heated to heat the brine, and the hot water line 74 is connected to the hot water switching valve 73 from the circulation pump 72. Warm water is supplied to the heat transfer coil 69 through the heat transfer coil 69 and returned to the brine tank 70 via the return line 75.
[0042]
The heater 71 is controlled by a thermostat 76 so that the hot water maintains a predetermined temperature (30 to 40 ° C.).
[0043]
A chiller tank 80 is connected to the brine tank 70, and brine is circulated by a circulation pump 81, and a refrigerator 52 is connected to a chiller coil 82 of the chiller tank 80.
[0044]
The brine tank 70 branches from the hot water line 74 of the hot water switching valve 73 and is connected to the cold water switching valve 83 and its cold water line 84. Between the cold water line 84 and the return line 75, a cooling coil 14a and a coil 50a are connected. In parallel, they are connected via on-off valves 85 and 86, respectively.
[0045]
Although the cooling coil 14a and the coil 50a are drawn separately from the cooling coil 14 of the vacuum pump 15 and the coil 50 of the gas liquefaction heat exchanger 45 for the purpose of illustration, they are the same. The gas liquefaction heat exchanger 45 is disposed.
[0046]
The vaporization tank 68 is connected to a float switch 88 for controlling the liquid level and provided with a level switch 89. The inlet side opening / closing control valve 60 is opened and closed so that the recovered liquid level in the vaporization tank 68 becomes a predetermined level or higher. It comes to control.
[0047]
The brine tank 70 is provided with an air vent pipe 90 and a liquid level switch 91.
[0048]
The vaporization tank 68 is provided with a thermometer 94, the main circuit 10 on the downstream side of the vaporization tank 68 is provided with a pressure gauge 96 and a pressure switch 97, and the pressure of the vaporized recovered gas is 10 kg / cm ² or more. The outlet side opening / closing control valve 63 is controlled so that the temperature in the tank 68 becomes 30 ° C. or more, and the heat input amount per unit time in the vaporization tank 68 is controlled.
[0049]
Further, the pressure reducing valve 64 adjusts the pressure on the downstream side in accordance with the filling pressure to the sealed device. On the downstream side of the filter 66, a pressure gauge 98 is provided for detecting the filling pressure to the enclosed device.
[0050]
A connection port 102 connected to the hose 25 is formed in the main circuit 10 of the vaporization circuit section E, and the recovered gas evaporated from the connection port 26 branched from the main circuit 10 of the vacuum pump circuit A is connected to the stop valve 27 and the connection port 12. It can be returned to the encapsulated device via the connection hose 11.
[0051]
Between the connection port 102 and the outlet-side main valve 67, a connection port 103 and a stop valve 104 for evacuating with a vacuum pump are connected.
[0052]
FIG. 2 shows another embodiment of the present invention.
[0053]
In the embodiment of FIG. 1, the example in which both the hot water and the cold water are alternately produced in the brine tank 70 has been described. However, in this case, since the cold water and the hot water cannot be produced at the same time, the recovery operation and the vaporization operation are separated. Will be done.
[0054]
Therefore, in the embodiment of FIG. 2, recovery and vaporization operation can be performed simultaneously.
[0055]
2, the configuration of the vacuum pump circuit unit A, the compression circuit unit B, the liquefaction circuit unit C, the storage tank unit D, and the vaporization circuit unit E connected to the main circuit 10 is the same as that in FIG. The cooling coil 14 of the vacuum pump 15 of the circuit part A, the cooling water source of the coil 50 of the heat exchanger 45 of the liquefaction circuit part C, and the hot water source of the vaporizer 62 of the vaporization circuit part E are separated. Only the difference.
[0056]
That is, a water heater 110 is provided as a hot water source of the vaporization tank 68 of the vaporizer 62, a heater 71 is provided in the water heater 110, and the hot water heated by the heater 71 is transmitted to the vaporization tank 68 by the circulation pump 112. The heat coil 69 is circulated.
[0057]
The cooling water source for the cooling coil 14 of the vacuum pump 15 and the coil 50 of the heat exchanger 45 is provided with a cold water tank 114 separately from the water heater 110, and the brine in the cold water tank 114 is connected to the refrigerator 52. The cooling water in the chilled water tank 114 is supplied to the cooling coil 14a and the coil 50a by the circulating pump 116 to cool the vacuum pump 15 and gas liquefaction. The recovered gas is subjected to condensate liquefaction in the heat exchanger 45.
[0058]
In the form of FIG. 2, since the water heater 110 and the cold water tank 114 are separate bodies, the recovery operation and the vaporization operation can be performed in parallel.
[0059]
FIG. 3 shows the circuit portions A to E shown in FIG. 1 accommodated in the same casing 120. In FIG. 3, (a) is a plan view, (b) is a front view, and (c) is a front view. It is a right view.
[0060]
In the casing 120, the vacuum pump 15, the cushion tank 17, the gas compressor 32, the gas liquefaction heat exchanger 45, the storage tank 53, the vaporizer 62, the dryer 65, the filter 66, the brine tank 70 described in FIG. A refrigerator 52 and a chiller tank 80 are accommodated.
[0061]
On the back surface of the casing 120, a connection port 12 with an insulating gas sealing device, its main valve 13, and a connection port 102 serving as an outlet of the vaporization circuit portion E and a main valve 67 are arranged and not shown in the drawing. However, the connection ports 26 and 103 and the stop valves 27 and 104 for evacuation are also arranged.
[0062]
Further, the instruments 122 such as a pressure gauge and a thermometer described in FIG. 1 are arranged on the front surface of the casing 120 so that the instruments 122 can be collectively monitored.
[0063]
Further, an operation panel 124 is provided on the front surface of the casing 120, a lamp 126 for displaying the operation status of each circuit unit A to E is provided on the operation panel 124, and an operation button 128 is provided.
[0064]
The operation button 128 includes a recovery operation button, a reset button, a stop button, and the like. The lamp 126 is a power lamp, a lamp for indicating that the insulating gas is recovered at a positive pressure and a negative pressure, a vacuum operation lamp, and a vacuum. It becomes a warning lamp for the operation status of each circuit A to E such as pump overload lamp, compressor overload lamp, refrigerator overload lamp, vaporizer abnormality lamp, etc. Normal or abnormal by blinking lamp 126 or lighting of different colors Can be understood.
[0065]
【The invention's effect】
In short, according to the present invention, in collecting insulating gas from an insulating gas sealing device such as a transformer, the vacuum pump circuit unit, compression circuit unit, liquefaction circuit unit, storage tank unit, and vaporization circuit unit are accommodated in the same casing. By doing so, it becomes compact and can have excellent transportability.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing an embodiment of the present invention.
FIG. 2 is a circuit diagram showing another embodiment of the present invention.
FIG. 3 is an external view showing an embodiment of the present invention shown in FIG. 1;
[Explanation of symbols]
A Vacuum pump circuit part B Compression circuit part C Liquefaction circuit part D Storage tank part E Vaporization circuit part F Control circuit part 15 Vacuum pump 120 Casing

Claims (3)

Vacuum pump circuit part consisting of a water-cooled vacuum pump that sucks and delivers insulating gas from the insulation gas-sealed device, compression circuit part that compresses the collected recovered gas, and liquefaction that cools and compresses the compressed recovered gas a circuit unit, and a storage tank portion enclosing storing recovered liquid obtained by liquefaction, the recovery liquid was sent from a storage tank unit is heated and vaporized in it consists of a vaporization circuit unit to be transmitted to the insulating gas filled device, the vaporization circuit The vaporizer is configured by a vaporization tank for introducing the collected recovered liquid and a heat transfer coil provided in the vaporization tank, and a brine tank is connected to the vaporization tank. A chiller tank connected to the refrigerator is connected to the brine tank, and when the insulating gas is recovered, the cold water generated in the brine tank is transferred to the cooling coil of the vacuum pump and the heat exchange co It poured into Le, when by heat vaporizing the recovered liquid storage tank unit sends the insulating gas filling device, the insulating gas recovery, characterized in that for supplying hot water heated by the heater provided in a brine tank in a heat transfer coil Filling equipment. Vacuum pump circuit part consisting of a water-cooled vacuum pump that sucks and delivers insulating gas from the insulation gas-sealed device, compression circuit part that compresses the collected recovered gas, and liquefaction that cools and compresses the compressed recovered gas It consists of a circuit part, a storage tank part that encloses and stores the liquefied recovered liquid, and a vaporization circuit part that heats and evaporates the recovered liquid sent from the storage tank part and sends it to the insulated gas-sealed device. The vaporizer is provided with a vaporization tank for introducing the collected recovered liquid and a heat transfer coil provided in the vaporization tank. The vaporization tank is provided with hot water in the heat transfer coil. A hot water tank to be supplied is connected, and a brine tank, a chiller tank, and a refrigerator are provided independently of the hot water tank, and the cold water generated in the brine tank is cooled by a cooling coil of a vacuum pump, a liquefaction circuit unit Insulation wherein the flow through the heat exchanger coil gas recovery filling device. The insulating gas recovery and filling device according to claim 1, wherein the vaporizing circuit unit is connected to a pressure adjusting valve and a dryer for adjusting the charging pressure on the insulating gas sealing device side .

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