JPH08178477A - Refrigerant recoverying device - Google Patents

Abstract

PURPOSE: To enable lubricant oil and refrigerant to be heated at a specified temperature preferable for separation from refrigerant gas by a method wherein an oil separator is arranged between a recoverying port and a compressor and the oil separator is provided with a heater which can be set to an optional temperature for heating the lubricant oil and the refrigerant. CONSTITUTION: A refrigerator and a recoverying port 3 are connected by a connecting hose 30 and communicated from each other so as to discharge air in the connecting hose 30 through an air relief valve 6. After this operation, when an opening or closing valve 7 is opened and a compressor 9 is started to operate, lubricant oil and refrigerant within the refrigerator are passed through the recoverying port 3, a pressure gauge 4, a sight glass 5, the air relief valve 6 and the opening or closing valve 7, sucked into an oil separator 8 and stored there. The lubricant oil and the refrigerant are controlled in their temperatures in such a manner that resolved refrigerant may easily be separated and easily gasified in a range of 35 to 40 deg.C in a constant state. Accordingly, it is possible to recover only the refrigerant gas without being influenced by a temperature of the surrounding air within a short period of time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant recovery device,
In particular, the present invention relates to a refrigerant recovery device suitable for use in a refrigeration cycle of an air conditioner for home electric appliances such as a refrigerator.

[0002]

2. Description of the Related Art A conventional refrigerant recovery device is actually used in Kaikaihei 4-39658.
As described in the publication, the lubricating oil and the liquid refrigerant recovered from the recovery refrigeration cycle are heated while flowing inside the pipe of the vaporizer to become refrigerant gas, which is sucked into the compressor to condense the high-pressure refrigerant gas. It was liquefied in a container and stored in a collection container.

[0003]

In the prior art, since the lubricating oil and the refrigerant are heated in the flow in the pipeline, the heated temperature of the lubricating oil and the refrigerant depends on the length and flow velocity of the pipeline. Change, it becomes difficult to heat uniformly,
It affected the vaporization of the refrigerant. Further, the temperature suitable for separating the refrigerant dissolved in the lubricating oil has not been clarified.

An object of the present invention is to collect lubricating oil and a refrigerant together in an oil separator, and heat the lubricating oil and the refrigerant gas to a certain temperature suitable for separation from the refrigerant gas when the oil separator is stored, and effectively lubricate the lubricating oil and the refrigerant gas. And separate.

[0005]

In order to achieve the above-mentioned object, the present invention is provided between a recovery port of a refrigerant recovery device and a compressor.
An oil separator is provided, and the oil separator is provided with a heater capable of setting an arbitrary temperature for heating the lubricating oil and the refrigerant.

[0006]

According to the present invention, the lubricating oil and the refrigerant extracted from the refrigerating cycle for recovery such as a refrigerator can be heated to a temperature suitable for separation in the oil separator section, so that only the refrigerant gas is not affected by the ambient temperature. It can be recovered in a short time.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. FIG. 1 shows a system diagram of a refrigerant recovery device.

The refrigerant recovery device 1 of the present invention comprises a recovery port 3, a pressure gauge 4, a sight glass 5, an air vent valve 6, an on-off valve 7, an oil separator 8, a compressor 9, a condenser 10 and a recovery container 1.
1 are sequentially connected by a pipe 20, and inside the oil separator 8, a heater 12 capable of raising the temperature of the stored lubricating oil and the refrigerant to an arbitrary temperature, and the stored lubricating oil are full. The liquid level detector 13 for detecting that the oil pressure has become the built-in pressure switch 14 for detecting the pressure inside the oil separator 8 and the pressure gauge 1 for confirmation.
5, and a discharge valve 16 for taking out the lubricating oil.

As an example of the to-be-collected refrigeration cycle 2, a refrigerator is used to describe the recovery of lubricating oil and refrigerant, but the refrigerator is not necessarily limited to a refrigerator, and an air conditioner including a car air conditioner, a room air conditioner, etc. It is intended for.

First, in order to recover the lubricating oil and the refrigerant from the refrigerator, the refrigerator and the recovery port 3 are connected by the connection hose 30 to communicate with each other, and the air in the connection hose 30 is discharged by the air bleeding valve 6. In addition, the refrigerator should be laid down sideways in a direction that makes it easy to drain the lubricating oil. After that, when the open / close valve 7 is opened and the compressor 9 is started, the lubricating oil and the refrigerant in the refrigerator pass through the recovery port 3, the pressure gauge 4, the sight glass 5, the air bleeding valve 6 and the open / close valve 7, and then the oil separator 8 It is sucked in and stored. The temperature of the lubricating oil and the refrigerant is controlled by the heater 12 so that the melted refrigerant is easily separated and is easily vaporized and kept constant at 35 ° C to 40 ° C.

The refrigerant gas separated from the lubricating oil and vaporized becomes a high pressure by the compressor 9, is discharged, becomes a liquid refrigerant in the condenser 10, and is stored in the recovery container 11.

When the recovery of the refrigerant gas is completed, the pressure switch 14
Detects that the pressure in the oil separator 8 has become negative, and stops the operation of the compressor 9. However, when the pressure inside the oil separator 8 has risen to a positive pressure again after a certain period of time has elapsed, the compressor 9 is started again and the refrigerant gas inside the oil separator 8 is sucked. By repeating this operation, the refrigerant gas can be completely recovered in the recovery container 11, and the recovery is completed. On the other hand, the lubricating oil stored in the oil separator 8 is taken out from the discharge valve 16 when the collection is completed.

The compressor 9 is used for the end of recovery from the refrigerator.
After confirming that the lubricating oil does not flow in the sight glass 5 regardless of whether the pressure gauge is started or stopped, the on-off valve 7 is closed and the pressure gauge 4 can be used to confirm that the pressure is kept below atmospheric pressure. It is possible and completed before the end of recovery of the refrigerant gas.

As described above, by setting the temperatures of the lubricating oil and the refrigerant stored in the oil separator 8 to 35 ° C. to 40 ° C., which are suitable for separation and vaporization, the recovery time can be significantly shortened.

Although the heater 12 is provided inside the oil separator 8 in this embodiment, the same effect can be obtained by winding the heater around the oil separator 8.

Further, the number of refrigerators is not limited to one, and a plurality of refrigerators can be collected at the same time.

[0017]

According to the present invention, since the lubricating oil and the refrigerant in the refrigeration cycle to be recovered are collectively recovered, the transfer from the refrigeration cycle to be recovered to the refrigerant recovery device can be completed in a short time. In addition, by heating the lubricating oil in which the refrigerant stored in the oil separator is dissolved to 35 ° C to 40 ° C, it becomes a temperature suitable for separating the lubricating oil as a refrigerant gas, and is not affected by the outside air temperature. The refrigerant can be recovered in the recovery container in an extremely short time.

[Brief description of drawings]

FIG. 1 is a system diagram of a refrigerant recovery device according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Refrigerant recovery device, 2 ... Refrigeration cycle for recovery, 3 ... Recovery port, 4 ... Pressure gauge, 5 ... Sight glass, 6 ... Air vent valve, 7 ... Open / close valve, 8 ... Oil separator, 9 ... Compressor,
10 ... Condenser, 11 ... Recovery container, 12 ... Heater, 13 ...
Liquid level detector, 14 ... Pressure switch, 15 ... Pressure gauge, 16
... discharge valve, 20 ... piping, 30 ... connecting hose.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mikio Kurosawa 5 3085, 3085 Nishikouchi, Higashiishikawa, Hitachinaka City, Ibaraki Hitachi Car Electronics Co., Ltd.

Claims (1)

[Claims] 1. An oil separator for separating lubricating oil and a refrigerant gas, a compressor for sucking and compressing the refrigerant separated by the oil separator, and a condenser for condensing and liquefying the refrigerant discharged from the compressor. A refrigerant recovery device comprising a recovery container for storing the refrigerant liquefied in the condenser,
In order to raise the temperature inside the oil separator to an arbitrary temperature, a heater is provided to the oil separator,
A refrigerant recovery device having a temperature suitable for separating lubricating oil and refrigerant gas.