JPH08159618A - Receiver for refrigerating device - Google Patents

Abstract

PURPOSE: To prevent the generation of excess filling of R134a refrigerant in retrofit time and inhibit a residual mineral oil from flowing in a system in a refrigerating plant receiver which is provided with a cylindrical part and a suction-up pipe which sucks up refrigerant to the upper part of the cylindrical part from the inner bottom of the cylindrical part and a sight glass communicated with the upper end of the suction pipe. CONSTITUTION: A cylindrical weir 10 is installed in close contact with the inner bottom of a receiver 1A so that a used mineral oil 4 may separate from R134a to overflow outside the weir 10 and be stored there.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver for a refrigerating machine, which is designed to prevent troubles and improve the performance of a system such as a car air conditioner, a bus air conditioner, etc., in which a used refrigerant is R12, at the time of retrofit.

[0002]

2. Description of the Related Art Due to CFC regulations, the refrigerant R12 currently used in car air conditioners and the like will soon be completely abolished. For this reason, R12 leaks from the already used car air conditioner,
When it becomes necessary to replenish the refrigerant, it is necessary to switch to the new refrigerant R134a. The conversion of the refrigerant from R12 to R134a without replacing the refrigerant device so much is hereinafter abbreviated as retrofit. Although mineral oil is generally used as a lubricating oil for R12, synthetic oil such as polyalkylene glycol (hereinafter abbreviated as PAG) is used as a lubricating oil in retrofit because it is insoluble in R134a. Since it is difficult to extract the mineral oil from the existing R12 system, the mineral oil is left in the system, and in general, the specified amount of PAG and R134a is charged to operate. FIG. 2 shows a refrigerant flow state in the receiver at this time.

FIG. 2 is a vertical sectional view of a conventional receiver.
1 is a receiver, 9 is a cylindrical part of the receiver, 2 is an inlet of the receiver, 3 is a liquid refrigerant retained in the receiver,
Reference numeral 4 is mineral oil, 5 is a wire mesh, 6 is a suction pipe, 7 is an outlet, and 8 is a sight glass.

Liquid refrigerant condensed by a condenser (not shown) flows into the receiver 1 from the inlet 2 in a waterfall shape. The liquid refrigerant 3 is stored in the receiver, and the above-mentioned mineral oil 4 is lighter and insoluble than R134a, so that it separates and floats in the upper layer. However, the mineral oil is entrained in the waterfall-like refrigerant and is sent from the suction pipe 6 to the receiver outlet 7 through the wire net 5 and has a built-in sight glass 8 in the upper portion of the receiver. If so, the sight glass comes into contact with the liquid refrigerant and is generally colorless and transparent. When the refrigerant charge amount is insufficient, bubbles are mixed and the liquid becomes cloudy. Therefore, in the market, at the time of service, the refrigerant is filled until the cloudiness disappears.

[0005]

In the conventional receiver described above, the mineral oil caught in the refrigerant falling in a waterfall shape is
Fine particles of mineral oil and R1
34a is mixed in an emulsion state, and the sight glass becomes cloudy even if the refrigerant filling amount is an appropriate amount or a prescribed amount or more. For this reason, at the time of retrofitting, the refrigerant filling amount is mistaken and the R134a is overfilled, resulting in trouble such as damage to the compressor.

[0006] Further, residual mineral oil stays in the heat exchange part of an evaporator or condenser mixed with PAG in the system to reduce the heat exchange performance, increase the pressure loss in the pipes, and reduce the refrigerant circulation amount, thereby freezing. It causes a decline in ability.

The present invention solves the above-mentioned drawbacks of the prior art, prevents overfilling of R134a during retrofitting, and prevents residual mineral oil from flowing through the system.

[0008]

Means for Solving the Problems The present invention has been made to solve the above problems and comprises a tubular portion, and a suction pipe for sucking up the refrigerant from the inner bottom portion of the tubular portion to above the tubular portion. In a receiver for a refrigerating device including a sight glass connected to an upper end portion of the suction pipe, the present invention relates to a receiver for a refrigerating device having the following features. (1) A cylindrical weir is provided in close contact with the inner bottom of the receiver. (2) The height of the weir is approximately 1/2 of the height of the receiver tubular portion.
2/3, and the distance between the weir and the inner surface of the tubular portion is approximately 10 to 20.
mm.

[0009]

[Action]

(1) Since the cylindrical weir that is in close contact with the inner bottom of the receiver is provided, when the compressor is operated during retrofitting, the mineral oil distributed at various points in the system is gradually fed into the receiver. Since mineral oil is lighter than the R134a liquid refrigerant, it floats in the upper layer, overflows from the weir, and flows out to the outside of the weir, so it is separated from R134a. Therefore, it is prevented that the mineral oil is sucked up by the suction pipe of the receiver.

(2) The height of the weir is 1/2 of that of the receiver tubular portion.
By setting it to ⅔, an appropriate amount of refrigerant is stored in the weir. In addition, the distance between the weir and the inner surface of the tubular portion is 10 to 20.
By setting the thickness to mm, it becomes possible to store the entire amount of the mineral oil originally used outside the weir.

[0011]

1 is a vertical sectional view of a receiver 1A according to the present invention. In the figure, 10 is a cylindrical weir provided so as to surround the suction pipe. The configuration other than the above is the same as that of the conventional receiver. The height of the weir 10 is about 1/2 to 2/3 of the height of the receiver tubular portion in consideration of the storage amount of mineral oil. Generally, in car air conditioners, lubricating oil is filled in an amount of 100 to 200 ml.
On the outside of the weir, the space between the weir and the inner surface of the receiver tubular portion is set so as to secure a space capable of storing this amount. Usually, this distance of 10 to 20 mm is sufficient. As a matter of course, the lower part of the weir will not be communicated with the inside and outside.

At the time of retrofitting a car air conditioner, the retrofit work can be facilitated by replacing the conventional receiver with the receiver according to the present invention. When the compressor is operated in the state where the receiver is provided, the mineral oil distributed in various places in the system is gradually sent into the receiver, and since the mineral oil is lighter than the liquid refrigerant of R134a, it floats in the upper layer in the receiver, When the amount of the refrigerant reaches the upper edge of the weir at which the amount of the refrigerant is appropriate, the mineral oil flows out of the weir and is separated from R134a. Therefore, the mineral oil is not caught in the suction pipe of the receiver, and it is possible to prevent the sight glass from continuing to become cloudy even when the refrigerant becomes excessive. by this,
The following effects occur. (1) It is possible to prevent overfilling of R134a during retrofitting, and avoid troubles such as damage to the compressor. (2) It is possible to prevent deterioration of heat exchange performance due to retrofit. (3) An increase in refrigerant pressure loss can be prevented and a reduction in refrigerating capacity can be avoided. (4) Cleaning work inside the system during retrofitting (PA
Flushing work several times by filling G + R134a) can be omitted.

[0013]

In the receiver for the refrigerating apparatus of the present invention,
A cylindrical weir that is in close contact with the inner bottom of the receiver is provided, or the height of the weir is approximately 1/2 of the height of the receiver tubular portion.
2/3, and the distance between the weir and the inner surface of the tubular portion is approximately 10 to 20.
Since it is mm, since the mineral oil that was originally used can be separated from the R134a refrigerant during retrofitting, the sight glass is prevented from continuing to become cloudy even after being filled with an appropriate amount of the refrigerant. Overfilling of the refrigerant and mineral oil is prevented from flowing through the system. This prevents troubles such as damage of the compressor.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a receiver according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a conventional receiver.

[Explanation of symbols]

 1,1A Receiver 2 Refrigerant inlet 3 Liquid refrigerant 4 Mineral oil 5 Wire mesh 6 Suction pipe 7 Refrigerant outlet 8 Sight glass 9 Cylindrical part of receiver 10 Weir

Claims (2)

[Claims] 1. A refrigerating apparatus comprising a tubular portion, a suction pipe for sucking a refrigerant from an inner bottom portion of the tubular portion to above the tubular portion, and a sight glass connected to an upper end portion of the suction pipe. A receiver for a refrigeration apparatus, characterized in that a tubular weir that is in close contact with the inner bottom portion of the receiver is provided. 2. The height of the weir is approximately 1/2 to 2/3 of the height of the receiver tubular portion, and the distance between the weir and the inner surface of the tubular portion is approximately 1.
The refrigerator receiver according to claim 1, wherein the receiver has a thickness of 0 to 20 mm.