JPS6320869Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a start-up protection device for a compressor used in a refrigeration device such as an air conditioner. It is concerned with preventing the occurrence of liquid compression and loss of lubricating oil during startup.

Configuration of conventional example and its problems In general, the refrigeration system of an air conditioner as shown in FIG. In the case where the units are separated, the necessary refrigerant is added to the system according to the length of the connecting pipe 7, and the amount of refrigerant in the system increases accordingly. Therefore, while the compressor 1 is stopped, due to the temperature difference between the indoor and outdoor units 4 and 5 and the difference in height between the installation positions of the units 4 and 6, the oil does not accumulate in the accumulator 3 but accumulates in the shell of the compressor 1.
Foaming occurs during startup, liquid compression and lubricating oil leak out, which causes problems in the compressor 1. Furthermore, in order to prevent the refrigerant from getting trapped in the lubricating oil of the compressor 1, a method of installing a crankcase heater is often adopted, but as mentioned above, the refrigerant connection pipe 7 becomes long and the system In a large air conditioner or the like where a large amount of refrigerant is charged, the amount of refrigerant that returns to the compressor 1 is large and cannot be adequately handled. Furthermore, as mentioned above, even if there is a height difference between the installation conditions of the indoor and outdoor units 4 and 6, if lubricating oil flows into the system, it will be difficult to return to the compressor 1, and the amount of refrigerant that will return when the compressor 1 is stopped will increase. Therefore, there was a problem that could not be solved with a crankcase heater.

Purpose of the invention The present invention was devised in view of the above-mentioned problems.
The object of the present invention is to provide a start-up protection device that maintains the levels of lubricating oil and refrigerant mixture in a compressor shell at a position where foaming does not occur even when there is a height difference between indoor and outdoor units.

Structure of the invention In order to achieve this objective, the invention provides a protective tank that is installed in parallel with the compressor, and communicates these with an inlet pipe that introduces a predetermined amount or more of refrigerant or lubricating oil, and a capillary tube that returns the lubricating oil. Furthermore, by communicating this tank and the compressor discharge pipe through a pipe line equipped with a valve that is opened during compressor operation, the lubricating oil in the compressor shell,
The refrigerant mixture is guided into the protective tank and stored in a position where foaming will not occur, and after the compressor starts, the lubricating oil in the tank is pumped using the pressure difference between the discharge side pressure and the pressure inside the shell. was gradually returned to the compressor through a capillary tube, achieving stable operation.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 2 shows a refrigerant system diagram of an air conditioner equipped with the start-up protection device of the present invention, and the same reference numerals as in FIG.

In this system, a protection tank 8 is installed in parallel with the compressor 1. This protective tank 8 communicates with the inside of the compressor 1 through an introduction pipe 9 and a capillary tube 10. That is, the introduction pipe 9 communicates the upper part of the tank 8 with a predetermined oil level position of the lubricating oil 11 in the compressor 1, and has an electromagnetic valve 12 interposed therebetween, which is opened when the compressor 1 is stopped. Further, the capillary tube 10 communicates the bottom of the tank 8 and the bottom of the compressor 1, and an inlet opening 10a on the tank 8 side is provided with a valve 13. This valve 13 has a float 1 that moves up and down depending on the amount of oil in the tank 8.
4 to open and close the inlet opening 10a. Furthermore, the tank 8 is a discharge pipe 1a of the compressor 1.
A solenoid valve 17 is interposed in the conduit 15, which opens after a predetermined time period determined by a timer 16 after the compressor 1 is started.

Next, the operation in the above configuration will be explained.

First, while the system (compressor 1) is stopped, the solenoid valve 17 is closed and the solenoid valve 12 is opened. Therefore, when the level of the lubricating oil 11 rises above the opening position of the introduction pipe 9 due to the return of refrigerant into the compressor 1, the lubricating oil 11 enters the tank 8 and adjusts the lubricating oil level in the compressor 1 shell. I can do it.

When the compressor 1 is started, the solenoid valve 12 is closed, and the solenoid valve 17 is opened after a period of time has passed after the compressor 1 is operated.
At this time, since the lubricating oil 11 is stored in the tank 8, the float 14 is floating and the valve 13 is open. When the solenoid valve 17 opens, high pressure is applied in the tank 1 through the pipe line 14 communicating with the discharge pipe 1a, and the lubricating oil 11 in the tank 8 is gradually returned to the low-pressure compressor shell through the capillary tube 10. When the tank 8 is empty, the float 14 is lowered, the valve 13 is closed, the discharge pipe (high pressure side) and the compressor shell (low pressure side) are shut off, and the system is operated as a normal system.

Effects of the invention As is clear from the above explanation, the present invention communicates the compressor and the protection tank through the introduction pipe, so even if there is an excessive amount of refrigerant or the connecting pipe is long, the lubrication inside the compressor shell will be maintained. The oil level is maintained at a position where liquid compression due to foaming and lubricating oil does not leak out, and furthermore, the lubricating oil in this protection tank is returned to the compressor from the capillary tube by pressure from the pipe connected to the discharge pipe, and steady operation is achieved. Compressor failure can be prevented.

[Brief explanation of drawings]

Figure 1 is a diagram of the refrigeration system of a conventional air conditioner.
Fig. 2 is a diagram of the refrigeration system of an air conditioner equipped with a start-up protection device according to an embodiment of the present invention, Fig. 3 is an illustration of the operation of the protection tank when the compressor is operating, and Fig. 4 is an explanation of the operation when the compressor is stopped. Show the diagram. DESCRIPTION OF SYMBOLS 1...Compressor, 1a...Discharge pipe, 8...Protection tank, 9...Introduction pipe, 10...Capillary tube, 11...
Lubricating oil, 12, 17... Solenoid valve (valve), 15...
conduit.

Claims (1)

[Scope of utility model registration request] It has a compressor and a protection tank installed in parallel with the compressor, and includes a valve that opens the inside of the compressor and the protection tank when the compressor is stopped. A conduit that communicates through an inlet pipe that introduces lubricating oil in the protective tank into the compressor and a capillary tube that returns the lubricating oil in the protective tank into the compressor, and is equipped with a valve that opens the discharge pipe of the compressor and the protective tank when the compressor is operating. Start-up protection device for the compressor connected to the