JPS60119307A - Prime mover driven working machine - Google Patents

Abstract

PURPOSE:To save energy, by using waste heat generated from a prime mover driven working machine as a heat source to heat refrigerant, and feeding the refrigerant to an expander to utilize the waste heat as an auxiliary power source for the working machine. CONSTITUTION:A compressor 10 is directly connected to a prime mover 11, and an expander 13 is connected to a drive shaft of the compressor 10. A suction side of the expander 10 is connected to an evaporation pipe 15 of an eveporator 14, while a discharge side is communicated with a condenser 16. A lubricating oil remaining at a bottom portion of a receiver tank 12 is introduced to an inlet of a secondary passage 18 of the evaporator 14 which passage serves as a passage for waste heat generated from the compressor 10. An outlet of the secondary passage 18 is communicated through an oil cooller 19 to a lubricating oil injection port of the compressor 10. In this manner, it is possible to save energy by utilizing the waste heat generated from the compressor.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a motor-driven working machine such as a generator or a compressor, and particularly to a motor-driven working machine that utilizes various types of waste heat generated from the motor or the working machine as an auxiliary power source. Regarding.

Conventionally, waste heat generated from a working machine such as a generator driven by an engine or a compressor driven by an engine or a motor, for example, in a compressor, is injected into the compressor to perform lubrication, sealing, and cooling effects to generate a high-temperature state. Waste heat from lubricating oil in The waste heat of the high-temperature cooling water that circulates through the radiator that cools the engine after the engine has been cooled, and the waste heat that is contained in the exhaust air that is blown outside the engine or motor to cool it, is exchanged for heat. At present, the waste heat is only released into the atmosphere, and little consideration has been given to the effective use of such waste heat as a heat source.

The present invention heats a refrigerant using the waste heat generated from the motor-driven working machine as a heat source, supplies this refrigerant to an expander, and uses it as an auxiliary power source for the working machine connected to the expander, thereby saving energy. The purpose is to

In order to achieve the above object, the present invention connects an expander to the drive shaft of a motor-driven working machine, and connects the suction side of the expander to the drive shaft of a motor-driven work machine.
The path of waste heat generated from the motor-driven work machine is connected to the evaporation pipe of the evaporator, which serves as a secondary flow path, and the discharge side of the expander is connected to the cooling pipe of the condenser, and the cooling pipe is connected to the evaporator of the evaporator. It is characterized in that it is connected to the evaporation tube which is the primary flow path.

1 to 5 are schematic diagrams for clearly demonstrating an embodiment of the present invention.

The present invention will be described in detail with reference to examples (in the figure, → indicates the flow and direction of the refrigerant, compressed gas, lubricating oil, radiator cooling water, and engine exhaust gas).

=3- In Fig. 1, a compressor 10 is a working device, and is directly connected to a prime mover 11 consisting of a motor or an engine, and has a discharge port provided with a pipe leading to a receiver tank 12. An expander 18 such as an expansion turbine is attached to the drive shaft of the compressor 10.
are connected to each other, and the suction side of the expander 13 is connected to an evaporator 14.
It is connected to an evaporation pipe 15 forming a primary flow path, and the discharge side communicates with a cooling pipe 17 of a condenser 16, and further communicates with the evaporation pipe 15 forming a primary flow path of the evaporator 14 via a pump P. ing. In the embodiment shown in the figure, fluorocarbon gas is used as a refrigerant in the primary flow path system that circulates from the discharge side to the suction side of the expander 13. Therefore, the evaporator 14 is used as a fluorocarbon evaporator, and the expander 13 is used as a fluorocarbon expander. configured.

On the other hand, at the inlet of the secondary flow path 18 of the evaporator 14, which is a path for waste heat generated by the motor-driven working machine, 4 is separated from the compressed gas and remains as a heat medium at the bottom of the receiver tank 12.
- Lubricating oil in a high temperature state is introduced through a pipe, and the lubricating oil is circulated through the outlet of the secondary flow path 18 to the lubricating oil injection hole of the compressor 10 via an oil cooler 19, also through the pipe. are connected like this. In the figure, reference numeral 21 indicates a discharge pipe for compressed gas, which is connected to an aftercooler (not shown). Further, 22 indicates the suction port of the compressor.

The first embodiment of the present invention is constructed as described above, and the condenser 1
The refrigerant, Freon R114 gas, is liquefied in the cooling pipe 17 of No. 6, pressurized by the pump P, sent to the evaporation pipe 15 forming the primary flow path of the evaporator 14, and discharged from the compressor 10 where it becomes a heating medium. Then, in the receiver tank 12, it is separated from the compressed gas and heated by exchanging heat with the high-temperature lubricating oil.
After generating 4 gases, the expander 13 performs an expansion action. When the Freon R114 gas passes through the expander 13 and expands, for example, an impeller of an expansion turbine rotates and is used as auxiliary power to rotationally drive the drive shaft of the compressor 10 connected to the expander 13. On the other hand, the lubricating oil is cooled by the oil cooler 19 and sent to the lubricating oil injection hole of the compressor. Note that since this lubricating oil is cooled by exchanging heat with the refrigerant in the evaporator 14, the oil cooler 19 may not be necessary.

FIG. 2 shows a second embodiment of the invention. In the first embodiment, a pipe line is provided for introducing lubricating oil as a heat medium into the secondary flow path 18 of the evaporator 14, but in this embodiment, a pipe line is provided for introducing the lubricating oil as a heat medium into the secondary flow path 18 of the evaporator 14. Compressed gas is introduced into the secondary flow path 18 of a given evaporator 14 . That is, it is configured to introduce compressed gas from the discharge pipe 21 of the receiver tank 12 into the secondary flow path 18 as a heat medium. The outlet of this secondary flow path 18 is connected to the outlet of service air via an aftercooler 23. In addition, 24 in the figure is an auto drain trap. Other configurations and operations are similar to those of the first embodiment.

FIG. 3 shows a third embodiment of the present invention, in which a working machine 10
As an example, a water-cooled engine-driven power generation TA20 is exemplified,
An expander 13 is connected to the drive shaft of the generator 20.

The water-cooled engine 11 is powered by a radiator 25 by a fan 26.
It is provided to blow air to cool the heated cooling water after cooling the engine 11 in the core part, and introduce the heated cooling water after cooling the engine 11 as a heat medium into the secondary flow path 18 of the evaporator 14. This is a connection of conduits. The cooling water that has passed through the evaporator 14 is sent to the radiator 25, where it is cooled and then sent to the engine 11 again.

Other configurations and operations are similar to those of the first embodiment.

FIG. 4 shows a fourth embodiment of the present invention, in which the engine 1
The exhaust muffler 31 attached to the exhaust muffler 18 serves as a secondary flow path through which the heat medium passes, and an evaporator pipe 7-15 serving as a primary flow path is provided within the secondary flow path 18, and is configured as the evaporator 14. . After exchanging heat with the high-temperature exhaust gas, the refrigerant is sent to the expander 13, and the expander generates an auxiliary power source for the working machine 10.

The rest of the structure and operation are the same as in the first embodiment.

FIG. 5 shows a fifth embodiment of the present invention, in which a working machine 10 directly connected to a water-cooled engine 11, such as a compressor and related equipment, is housed in a box having an intake hole 33 and an exhaust hole 32 for outside air. The present invention is applied to a so-called soundproof compressor housed in the box body 30, and the box body 30 is closed near the exhaust hole 32 of the box body 30.
The exhaust air after cooling the engine 11, compressor 10, and other equipment in the evaporator 14 is used as a heat medium, and the vicinity of the exhaust hole 32, which is the passage path of the exhaust air that is the heat medium, is a secondary flow path of the evaporator 14. year,
This secondary stream I@18 is provided with an evaporator 14 using the evaporator tube 15 as a primary flow path for the refrigerant.

Outside air is introduced through the intake hole 33 of the box body 30 by the fan 26 of the radiator 8-25 or by a ventilation fan (not shown), and is discharged from the exhaust hole 32 to ventilate the inside of the box body, and then the engine 11, compressor 10, etc. The exhaust hole 32 prevents the temperature inside the box from rising due to heat generated from the equipment.
When exhausting the air, the exhaust air exchanges heat with the refrigerant in the evaporation tube 15,
The heated refrigerant is sent to the expander 13 and used as an auxiliary power source for the working machine. The rest of the structure and operation are the same as in the first embodiment.

As described above, the present invention connects an expander to the drive shaft of a motor-driven working machine, and uses the suction side of the expander as a secondary flow path for waste heat generated from the motor-driven working machine. At the same time, the discharge side of the expander is connected to the cooling pipe of the condenser, and the cooling pipe is connected to the evaporation pipe which runs through the primary flow path of the evaporator. Since the generated waste heat is used as a heat source to exchange heat with a refrigerant and drive an expander to serve as an auxiliary power source for the working machine, it is possible to save energy with an extremely simple configuration.

[Brief explanation of drawings]

The figure is a schematic diagram showing an embodiment of the present invention, and FIGS. 1 to 5 show the first to fifth embodiments of the present invention, respectively. 10... Working machine (compressor) 11... Prime mover (engine or motor) 13... Expander 14... Evaporator 16... Condensing machine 18... Secondary flow path P... ...
Pump patent applicant Hokuetsu Kogyo Co., Ltd. agent Patent attorney Masaaki Ogura = 11-2 Procedure? Yusho (spontaneous) May 17, 1980 Director-General of the Japan Patent Office Kazuo Wakasugi 1. Indication of the case 1988 Patent Application No. 224474 2. Name of the invention Motor drive working machine 3. Person making the amendment Related Patent Applicant Address: 113 Otakeshinden, Bunsui-cho, Nishikanbara-gun, Niigata Prefecture Name: Hokuetsu Kogyo Co., Ltd. 4, Agent: 105 Telephone: (436) 2398
(alternative) Specification 6, engraving of the amended statement of contents (no change in content) =46-

Claims (6)

[Claims] (1) An expander is connected to the drive shaft of a motor-driven working machine, and the suction side of the expander is connected to an evaporation pipe of an evaporator whose secondary flow path is the path of waste heat generated from the motor-driven working machine. A motor-driven working machine characterized in that the discharge side of the expander is connected to a cooling pipe of a condenser, and the cooling pipe is connected to the evaporation pipe which is a primary flow path of an evaporator. (2) Claim 1, wherein the working machine comprises an oil-cooled compressor, and after lubricating the oil-cooled compressor, heated lubricating oil is introduced into the secondary flow path of the evaporator. The motor-driven working machine described in Section 1. 1- (3) The motor-driven working machine according to claim 1, wherein the working machine comprises a compressor, and compressed gas from the compressor is introduced into the secondary flow path of the evaporator. (4) The prime mover-driven working machine according to claim 1, wherein the prime mover is a water-cooled engine, and heated cooling water after cooling the engine is introduced into the secondary flow path of the evaporator. (5) The motor-driven working machine according to claim 1, wherein the motor comprises an engine, and the exhaust muffler of the engine serves as a secondary flow path of the evaporator. (6) The motor-driven working machine according to claim 1, wherein the ventilation and exhaust path of the motor-driven working machine is a secondary flow path of an evaporator.