JPS58110877A - Compressor - Google Patents

Abstract

PURPOSE:To prevent a damage due to the interruption of oil supply upon starting the machine by a method wherein a valve, opened after starting the machine with a constant time delay, is provided at the suction port or the discharge port of a gas, in the compressor equipped therein with an oil reservoir for reserving the oil separated from the gas (refrigerant medium gas). CONSTITUTION:A refrigerating cycle is constituted by connecting the compressor 1, a condenser 2, an expansion valve 3 and an evaporator 4 into a closed circuit through pipings while the compressor 1 is driven through a solenoid clutch 7 by the power of a driving source 9 such as an engine or the like. A solenoid valve 5 is provided at the discharging side of the compressor 1. The solenoid valve 5 is connected in parallel with a switch 6 for starting and stopping the compressor 1 while a delay circuit 8 is connected in series with the electric circuit of the solenoid valve 5. According to this constitution, when the compressor 1 is started by putting the switch 6 ON to connect the clutch 7, the solenoid valve 5 is opened with a constant time delay by the operation of the delay circuit 8, therefore, the good lubrication of the compressor 1 may be effected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to an air conditioner for an automobile, and is particularly suitable for a device that has an oil reservoir for storing oil separated from refrigerant gas inside and is often started at high speed rotation. related to compressors.

When the compressor is stopped, the pressures on the high-pressure side and the low-pressure side of the refrigeration cycle become balanced through the compressor or the expansion valve.

If the compressor is started in this state, a large amount of gas will be rapidly discharged because the specific volume of the gas on the suction side is small. As a result, the oil in the chamber is blown away, resulting in insufficient lubrication and damage to the bearing or seizure.

An object of the present invention is to provide a compressor that prevents oil from rising even when started and stopped during high-speed rotation and can be operated safely.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

The refrigerant gas compressed by the compressor 1 is cooled by the condenser 2 to become liquid, and expanded by the expansion valve 3 to be transferred to the evaporator 4.
The air is cooled and turned into gas, which is sucked into the compressor 1 to form a refrigeration cycle.

Further, power is transmitted from the drive source 9 to the compressor 1 by engaging an electromagnetic clutch 7. The compressor 1 is started and stopped by turning the clutch 7 on and off by turning on and off the switch 60, and the solenoid valve 5Fi at the discharge port is installed in parallel with the solenoid valve 5Fi delay circuit 8, so that the compressor 1 is activated with a certain time delay after the clutch 7 is connected. . The solenoid valve 5 is closed while the compressor 1 is stopped, and opens when the electromagnetic clutch 7 is energized.

According to this embodiment, when the compressor 1 is started at high speed by energizing the electromagnetic clutch 70, the discharge port of the pressure 11JII is closed immediately after the start, so that a large amount of refrigerant gas does not flow. Oil is secured and compressor 1 at startup
Lubricate. Then, after a certain period of time has elapsed, the solenoid valve 5 at the discharge port is opened and the normal operating state resumes. Therefore, there is an effect of preventing accidents such as damage to the bearings due to oil shortage at the time of startup, and furthermore, accidents such as seizure of the compressor 1.

Note that if the solenoid valve 5 at the discharge port is configured so as not to completely close the discharge port of the compressor 1, the flow rate of refrigerant gas will not increase suddenly even if the solenoid valve 5 opens after startup.
Furthermore, it is effective in preventing oil from rising inside the chamber.

According to the present invention, lubricating oil can be secured in the chamber even when the compressor is started and stopped during high-speed rotation, so that seizure during startup or damage to the bearings can be prevented. Furthermore, for example, it is an optimal compressor when controlling the start and stop of a compressor to save energy in a car air conditioner.

[Brief explanation of drawings]

The figure is a system diagram of a ° refrigeration cycle using the compressor of the present invention. DESCRIPTION OF SYMBOLS 1... Compressor, 5... Solenoid valve of compressor discharge port, 6...
...Switch, 7...Electromagnetic clutch, 8...Delay circuit.

Claims (1)

[Claims] In a gas compression device that has an internal reservoir of oil separated from the gas, a valve is provided at the gas inlet or outlet that is linked to the start switch and opens after a certain period of time after startup. Compressor features.