JP2003239863A - Engine driven air compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine driven air compressor in which a temperature of a heated part is effectively lowered with the usage of the air delivered from a cylinder of a pump when an engine is in an idling operation condition. <P>SOLUTION: When the engine 9 is in the idling operation condition, the air delivered from the cylinder 2 passes a pipe 3, a pilot valve 5, and a pipe 6, and then flows to the cylinder 2 or the pipe 3 at a high temperature through a delivery port of the pipe 6 on an outer side. The pipe 6 made of a material excellent in heat radiating performance is provided with a cooling fin, and is made to have the length as long as possible structurally so as to work as a part for providing a cooling effect. Thus, cooling efficiency is improved. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing compressed air discharged from a pilot valve to the outside when an air tank reaches a set pressure and an engine is idling. The present invention relates to an engine-driven air compressor that discharges toward a part that becomes an air compressor. 2. Description of the Related Art FIG. 4 shows a conventional engine-driven air compressor.
Shown in When the engine 9 is operated, the rotation shaft of the engine 9 rotates and is transmitted via a pulley to the rotation shaft of the pump 1 constituting the compression unit, and the piston connected to the rotation shaft of the pump 1 moves through the cylinder 2 of the pump 1. Reciprocating, air is sucked into the cylinder 2 from the outside by the reciprocating motion of the piston, and is sent into the air tank 4 through the pipe 3;
The air tank 4 is stored. When the pressure in the air tank 4 reaches the maximum pressure set by the pilot valve 5, the engine 9 starts idling, and the compressed air discharged from the pump 1 during idling does not pass through the air tank 4 but is exhausted from the pilot valve 5. Released from the mouth 10 to the outside,
The maximum pressure set by the pilot valve 5 is not exceeded. [0003] However, in the above structure, the compressed air which has been heated by the pump 1, the pipe 3 connected to the pump 1, the pilot valve 5, and the like flows. In addition to the fact that the parts become hot, there is a problem that the maximum pressure set by the pilot valve 5 fluctuates due to the effect of high-temperature compressed air. [0004] It is an object of the present invention to provide an engine-driven air compressor that effectively cools hot parts and maintains the maximum pressure of an air tank at an appropriate value. An object of the present invention is to supply compressed air discharged to the outside when an engine is idling,
This is achieved by a structure in which the air flows through a pump, a pipe, or the like, which has a high temperature, through another air flow path added to the pilot valve. The material and shape of another air flow path added to the pilot valve is a material that has a heat radiation effect, and is provided by providing cooling fins or making the air flow path as long as possible. It is possible to lower the temperature of the air and increase the cooling effect. An embodiment of the present invention will be described below with reference to the drawings. When the engine 9 is operated, the rotating shaft of the engine 9 rotates and is transmitted to the rotating shaft of the pump 1 via a pulley (not shown), and a piston (not shown) connected to the rotating shaft in the cylinder 2. ) Reciprocate, and the air sucked into the cylinder 2 is discharged to the pipe 3. The air flows out to the air tank 4 through the pipe 3, and the air is accumulated in the air tank 4 up to the maximum pressure set by the pilot valve 5. When the pressure reaches the maximum pressure, the pilot valve 5 operates, and the engine 9 starts idling. Thereafter, the air discharged from the cylinder 2 passes through the pipe 6 and is discharged to the surfaces of the cylinder 2 and the pipe 3 where the temperature becomes high. Further, the material and the shape of the pipe 6 are made of a material having good heat dissipation properties. By providing cooling fins or making the air flow path as long as possible in structure, the released air can be cooled and the effect can be enhanced. FIG. 2 is a perspective view of the periphery of the pump, which is a part of FIG. 1, and shows the pump 1 until the air tank 4 reaches the maximum pressure.
3 shows the flow of air discharged from the cylinder 2 of FIG. Until the air pressure in the air tank 4 reaches the maximum pressure, air is accumulated in the air tank 4 by the flow of air 7 discharged from the cylinder 2. FIG. 3 is a perspective view of the periphery of the pump 1 which is a part of FIG. 1, and shows the flow of air discharged from the cylinder 2 of the pump 1 when the engine 9 is idling.
After the air pressure in the air tank 4 reaches the maximum pressure, the operation of the engine 9 changes to idling, the air discharged from the cylinder 2 does not enter the air tank 4, and the flow of air 8 discharged from the cylinder 2 causes the cylinder 2 and the pipe to flow. Flow to 3. As described above, according to the present invention, when the engine is idling, the air discharged to the outside is brought into contact with the high temperature cylinders and pipes of the pump to increase the temperature. The temperature of the parts can be reduced, and the fluctuation of the maximum pressure set by the pilot valve 5 can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing an embodiment of an engine-driven air compressor according to the present invention. FIG. 2 is a perspective view around the pump, which is a part of FIG. 1, and shows the flow of air discharged from the cylinder of the pump until the air tank reaches a maximum pressure. FIG. 3 is a perspective view of a part around the pump, which is a part of FIG. 1, and shows a flow of air discharged from a cylinder of the pump when the engine is idling. FIG. 4 is a front view showing a conventional engine-driven air compressor. [Description of Signs] 2 is a cylinder, 3 is a pipe, 5 is a pilot valve, 6
Is a pipe, 7 is a flow of air when accumulating pressure, 8 is a flow of air when idling, and 9 is an engine.

Claims (1)

Claims 1. An engine, a compression section driven by the engine to produce compressed air, an air tank storing compressed air produced by the compression section, and a maximum air pressure in the air tank. An engine driven air compressor having a pilot valve for releasing compressed air to the outside when the pressure is equal to or higher than a set pressure, wherein the engine drive discharges the released compressed air to a component whose temperature becomes high by operation of the air compressor. Type air compressor.