JP4822893B2 - Wiring structure of heater for vacuum pump device - Google Patents

Description

  The present invention relates to a wiring structure for supplying electricity to a heater device that heats a diffuser of an ejector constituting the vacuum pump device, for example, for a vacuum pump device for evacuating a condenser.

In a condenser vacuum pump system that extracts air from a steam turbine condenser, in order to prevent the air ejector attached to the condenser from freezing, the outer surface of the diffuser is covered with a diffuser heater and the diffuser heater is turned on. Thus, a structure for heating the diffuser by heating the diffuser heater is already known (see, for example, Patent Document 1). And when using such a diffuser heater, the said patent document 1 also points out the possibility that the electric wire for supplying electricity to the diffuser heater will break.

However, since the wiring structure for supplying electricity to the diffuser heater is not described in detail in Patent Document 1, the general wiring structure will be described with reference to FIG. 6 of the present application. The insulated wires 102 and 103 are used in almost all areas of the electric wire connecting the terminal 101. The diffuser heater 100 and the heat insulating cables 102 and 103 are connected via crimp terminals 104 and 104.
JP 2002-71279 A

However, in the case of the wiring structure for supplying electricity to the diffuser heater as described above, the heat from the diffuser heater 100 is transmitted to the heat insulating cables 102 and 103 via the crimp terminals 104 and 104, and the heat insulation is performed. where there may be broken by applied thermal stress to the cable 102 and 103, in such a case, since the heat insulating cable 102 and 103 are each as of single, integrally discarded, to be replaced Narazu, exchange There was a problem that the cost was high.

  In this regard, as shown in Patent Document 1, the diffuser heater itself is eliminated, and water heated by the vacuum pump is injected into a sealed container-like jacket covering the entire air ejector, thereby keeping the diffuser warm. It is also considered. According to such a condenser vacuum pump system, the necessity of replacing the damaged insulation cable itself is eliminated, so that the problem of replacement cost of the insulation cable is solved. However, in Patent Document 1, it is necessary to make significant improvements such as adding a jacket to the existing vacuum pump system, and the cost for improvement is relative to the cost of replacing the insulated cable multiple times. There is an inconvenience that there is a possibility that it will become expensive.

  Therefore, the present invention replaces the heat insulation cable even if it breaks due to thermal stress applied to the heat insulation cable while maintaining the existing configuration of providing the diffuser heater with respect to the vacuum pump device. An object of the present invention is to provide a wiring structure for a heater for a vacuum pump device, in which the cost is relatively reduced.

The wiring structure of the heater for a vacuum pump device according to the present invention includes an ejector, a gas-liquid separator, and a circulation path of gas, liquid, and a mixture thereof formed by coupling at least a circulation pump, and the ejector and condenser. And an exhaust path connecting the gas-liquid separator and the outside, and the gas taken into the circulation path from the condenser via the intake path is sent to the exhaust path. In the vacuum pump device that evacuates the condenser by discharging it to the outside, a heater device is arranged outside the diffuser of the ejector, and the heater device is turned on by turning on the power. is heated, the electric wires for supplying electricity to the heater device from the power source was also constructed by connecting the partial lines of the electric wire drawn and minutes lines of the electric wire drawn from the heater device from the power supply The insulation of the electric wire drawn from the heater device is a heat-insulated cable in which a copper wire is housed in a sheath made of Teflon (registered trademark), and the electric wire drawn from the power source is insulated from the copper wire made of vinyl. The insulated wire is covered with a body, and the insulated cable, which is a line of the electric wire drawn from the heater device, and the insulated wire, which is a line of the electric wire drawn from the power source, are connected in the exposure box. (Claim 1).

  Therefore, for each electric wire drawn from the heater device, even if heat is transmitted from the heater device and the wire is disconnected due to thermal stress, it is only necessary to replace the electric wire drawn from the heater. It is not necessary to replace the branch line of the electric wire drawn out from. In addition, you may have the input valve for adjusting the air quantity suck | inhaled from a condenser in the middle of an intake passage.

In addition, the insulated cable is a cable in which, for example, copper wire is accommodated by a sheath made of Teflon (registered trademark), and for example, IV wire (600 V vinyl insulated wire) is used as the insulated wire. The ratio of expensive heat-insulated cables can be reduced as a whole electric wire while maintaining heat insulation for the branch lines, and cost can be further reduced.

Furthermore, since the connection part of the split lines of an electric wire is covered with an exposure box, the intensity | strength of a connection part improves relatively.

According to the present invention, even if the electric wire drawn from the heater device is disconnected from heat due to the heat transmitted from the heater device, it is only necessary to replace the electric wire drawn from the heater. Since the branch lines of the electric wires drawn from the power source do not have to be replaced, the replacement cost of the electric wires can be reduced as compared with the case where all the electric wires from the heater to the power source are replaced. In addition, while a heat-insulating cable is a cable in which, for example, copper wire is accommodated with a sheath made of Teflon (registered trademark), for example, IV wire (600V vinyl insulated wire) is used as an insulated wire. The proportion of the expensive heat-insulated cable can be reduced as the whole electric wire while maintaining the heat insulating property for the branch lines of the nearby electric wires, and the cost can be further reduced.

  The best mode of the embodiment of the present invention will be described below with reference to the drawings.

  FIG. 1 shows an example of a vacuum pump device 1 in which the present invention is used. This vacuum pump device 1 is for extracting air from a condenser 2 that constitutes a part of a power plant (not shown) to evacuate the condenser 2.

  The vacuum pump device 1 includes a circulation path 10 formed by appropriately connecting the ejector 3, the gas-liquid separator 8, and the circulation pump 9, and an intake path 11 formed by connecting the ejector 3 and the condenser 2 by piping. An end side is joined to the gas-liquid separator 8 and the other end is not shown in the figure, but has an exhaust path 12 formed by pipe connection to the outside such as an exhaust pipe. In this embodiment, an input valve 13 for adjusting the amount of air sent to the ejector 3 by an opening / closing operation is provided in the middle of the intake passage 11.

  The ejector 3 includes a nozzle 4 that forms an input port for a fluid mainly composed of water, a suction chamber 5 that is defined on the tip side and the side of the nozzle 4, and the nozzle 4 is connected to the suction chamber 5. The control port 6 is provided on the side, and the diffuser 7 forms a fluid output port made of a mixture of water and air. The control port 6 is connected to the intake passage 11. The gas-liquid separator 8 is for separating the mixed fluid into a gas and a liquid. The gas layer portion is connected to the exhaust passage 12, and the liquid layer portion is connected to the circulation pump 9 side of the circulation passage 10. ing.

  Thereby, since the water is ejected from the nozzle 4 of the ejector 3 toward the suction chamber 5 by driving the circulation pump 9 and supplying water from the liquid layer part of the gas-liquid separator 8 to the ejector 3, the input When the valve 13 is opened, the air in the condenser 2 is sucked into the suction chamber 5 from the intake passage 11 through the control port 6 due to the suction action generated at that time. And the water from the nozzle 4 and the air from the condenser 2 are mixed in the suction chamber 5, and this mixed fluid is sent to the gas-liquid separator 8, where it is re-separated into water and air. The water is temporarily stored in the gas-liquid separator 8, and the air is discharged to the outside via the exhaust path 12. By the above operation, air is sucked out of the condenser 2 and the inside of the condenser 2 can be evacuated.

  On the other hand, the diffuser 7 of the ejector 3 has a heater device 15 on the outside in order to prevent internal freezing. As shown in FIGS. 3 and 4, the heater device 15 includes two plate-like members 16 and 17 arranged in close contact with the outer surface of the diffuser 7, and both the plate-like members 16 and 17 are diffusers. 7 and a cylindrical member 18 that further wraps from the outside in the radial direction. The plate-like member 16 and the plate-like member 17 are made of a material that is heated by electricity, such as copper, and the diffuser 7 is formed by forming two predetermined intervals along the axial direction of the diffuser 7. It is wound around the outside. The cylindrical member 18 is made of a material that does not conduct electricity, and has a through hole 21 for projecting terminals 19 and 20 described below to the outside. The cylindrical member 18 may be configured by using a rectangular plate and connecting the both ends in the longitudinal direction with screws or the like to form a cylinder.

  Terminals 19 and 20 are formed to protrude in the vicinity of the edge portions of the plate-like members 16 and 17 which are opposed to each other with the space therebetween, and one of the terminals 19 and 20 is sandwiched between nuts 22 and 23. In this way, the crimp terminals 24 and 24 are mounted, and the crimp terminals 24 and 24 are electrically connected by being connected by a heat insulating cable 25 of an electric wire. On the other hand, the other terminals 19 and 20 are fitted with crimping terminals 24 and 24 so as to be sandwiched between nuts 22 and 23. These crimping terminals 24 and 24 are connected to electric wires 27 and 28 described later. Has been. In addition, each terminal 19 and 20 and the assembly | attachment body of the nuts 22 and 23 and the crimp terminal 24 which were extrapolated to these are covered with the cover 26. FIG.

  And the opposite side to the crimp terminal 24 of the electric wires 27 and 28 is connected with the power supply 29, and in this embodiment, it has the switch 30 for turning ON / OFF the power supply 29 in the middle of this electric wire 27. . Thereby, the heater device 15 is supplied with electricity when it is turned on to heat the heater 29 and keeps the diffuser 7 warm, so that it is possible to prevent the diffuser 7 from freezing in winter.

  In this embodiment, the electric wires 27 and 28 are divided into 27 A and 28 A made of heat-insulated cables and the like drawn from the crimp terminal 24, and 27 B and 28 B made of insulated wires drawn from the power source 29 in the exposure box 34. Connected and configured. The outline of the split lines 27A and 28A, which are heat-insulating cables, is not particularly illustrated, but is configured to store a copper wire with a sheath made of, for example, Teflon (registered trademark). Further, the outlines of the split wires 27B and 28B, which are insulated wires, are not particularly shown in the IV wire (600V vinyl insulated wire), but the copper wire is covered with an insulator made of, for example, vinyl.

  The connection between the segment lines 27A, 28A and the segment lines 27B, 28B will be described in more detail with reference to FIG. 5. The insertion hole 31 for inserting the segment lines 27A, 28A into the interior, and the segment lines 27A, 28B. An exposure box 34 having an insertion hole 32 for inserting the inside of the inside and two connection terminals 33 projecting inward from the inner wall surface is used. 32, and the dividing lines 27B and 28B are inserted into the exposure box 32, and the crimp terminals 35 provided at the ends of the dividing lines 27A and 28A are extrapolated to the connection terminals 33 and the dividing lines 27B and 28B. The crimp terminal 36 provided at the end is extrapolated to the connection terminal 33. The crimp terminals 35 and 36 are fixed by being clamped in the axial direction of the connection terminal 33 by a nut 37 that has been extrapolated in advance and a nut 38 that is extrapolated last.

  According to the above, even if the split lines 27A, 28A of the electric wires 27, 28 are transferred from the heater device 15 via the crimp terminal 24 and disconnected due to thermal stress, the split lines 27A, 28A can be replaced. The branch lines 27B and 28B do not need to be replaced, so that the replacement cost of the electric wires 27 and 28 can be reduced. Moreover, the improvement for reducing the cost is that instead of the electric wire made of a single heat-insulated cable, the electric wire 27 made of the split lines 27A and 27B, the electric wire 28 made of the split lines 28A and 28B, and the split line 27A and Since only the line 27B and the exposed box 34 that covers the connecting portion between the line 28A and the line 28B are used, the improvement is simple, and the cost for the improvement can be kept low.

FIG. 1 is a schematic diagram showing an example of the configuration of a condenser vacuum pump device. FIG. 2 is a schematic diagram showing a wiring structure between a heater and a power source according to the present invention. FIG. 3 is a specific configuration diagram showing a wiring structure between the heater and the power source according to the present invention. FIG. 4 is a cross-sectional view showing the configuration of the heater device arranged outside the diffuser. FIG. 5 is a partially cutaway view showing a connection structure of electric wire branch lines inside the exposure box. FIG. 6 is a schematic diagram showing a wiring structure between a conventional heater and a power source.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vacuum pump apparatus 2 Condenser 3 Ejector 4 Nozzle 5 Suction chamber 6 Control port 7 Diffuser 8 Gas-liquid separator 9 Circulation pump 10 Circulation path 11 Intake path 12 Exhaust path 13 Input valve 15 Heater apparatus 24 Crimp terminal 25 Thermal insulation cable 27 Electric wire 27A branch (insulated cable)
27B Split (insulated wire)
28 Electric wire 28A Split (insulated cable)
28B branch (insulated wire)
29 Power supply 30 Switch 34 Exposed box 35 Crimp terminal 36 Crimp terminal

Claims (2)

A circulation path of gas, liquid, and a mixture thereof including at least an ejector, a gas-liquid separator, and a circulation pump; an intake path connecting the ejector and the condenser; and the gas-liquid separator; is constituted by an exhaust passage for connecting the external, the condenser by discharging from the condenser gas taken into the circulation path through the air intake passage, to the outside via the exhaust passage In the vacuum pump device that makes the inside vacuum,
While arranging the heater device outside the diffuser of the ejector, this heater device is heated by turning on the power,
Each electric wire for supplying electricity from the power source to the heater device is configured by connecting a wire segment drawn from the heater device and a wire segment drawn from the power source,
The electric wire drawn from the heater device is a heat insulating cable in which a copper wire is housed in a sheath made of Teflon (registered trademark), and the electric wire drawn from the power source is made of an insulator made of vinyl. With covered insulated wires,
A wiring structure of a heater for a vacuum pump device , wherein a connection between a heat insulating cable as a branch line of an electric wire drawn out from the heater device and an insulated wire as a branch line of an electric wire drawn from the power source is performed in an exposure box . The connection in the exposed box of the insulated cable that is a branch line of the electric wire drawn from the heater device and the insulated wire that is a branch line of the electric wire drawn from the power source is,
An exposure box having an insertion hole for inserting the insulated cable into the interior, an insertion hole for inserting the insulated wire into the interior, and two connection terminals formed to project inward from the inner wall surface thereof Use
The insulation cable is inserted into the exposure box from the insertion hole and the insulated wire is inserted into the exposure box from the insertion hole, and a crimp terminal provided at an end of the insulation cable is used as the connection terminal. After extrapolating and after extrapolating the crimp terminal provided at the end of the insulated wire to the connection terminal,
2. The crimp terminal according to claim 1, wherein the crimp terminal is clamped and fixed in the axial direction of the connection terminal by a nut that is extrapolated in advance and a nut that is extrapolated last. The wiring structure of the heater for a vacuum pump apparatus of description.

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