JPH0532666B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a receiver used in a cooling, refrigeration, and air conditioning (hereinafter simply referred to as air conditioning) device, and particularly to a receiver for an automobile cooling device (car cooler).

In general, an air cooling device is composed of equipment as shown in FIG.

The refrigerant in the receiver 1 is throttled and expanded by the expansion valve 2, and is further evaporated under isothermal and pressure conditions in the evaporator 3 to remove heat from the outside.
It is adiabatically compressed by a compressor 4, isobarically cooled and condensed by a condenser 5, and then returned to the receiver 1.

The receiver 1 is a container in which liquefied refrigerant is temporarily retained, and since the required amount of refrigerant constantly changes depending on outside air conditions, operating conditions, etc., the receiver 1 has a function to cope with load fluctuations. Also, in general,
The receiver also has the function of removing moisture and dirt contained in the refrigerant.

Generally, the structure of the receiver includes a tank 6, a refrigerant inlet 7, a refrigerant outlet 8, a sight glass (inspection window) 9, a pipe 10, a strainer 11, and a moisture absorbent (desiccant) 12, as illustrated in FIG. The amount of refrigerant 13 increases or decreases depending on the operating condition.

Conventionally, this receiver was often made of steel, which caused the following problems.

(1) When moisture enters Freon, which is mainly used as a refrigerant, it hydrolyzes, producing hydrochloric acid and hydrofluoric acid that corrode steel.

(2) Painting is required to prevent external corrosion.

(3) It is heavy.

For this reason, in recent years, aluminum products have been partially adopted mainly as a measure against the above (1), but they have the drawback of significantly increasing manufacturing costs.

The inventors of the present invention have improved the shortcomings of conventional products. They are free from corrosion by hydrochloric acid, have chemical resistance to refrigerants and oil, can be formed with a thin tank wall, are lightweight, and have no fluorocarbon permeability. As a result of various studies on a liquid receiver that has sufficient strength and airtightness and is resistant to water, the present invention has been completed.

Next, the present invention will be explained based on examples showing preferred examples of the present invention. FIG. 3 is a sectional view showing an embodiment of the liquid receiver of the present invention.

The receiver tank according to the present invention has a tank head 14 and a tank bottom 1, as shown in FIG.
5 are molded from resin, and then the end portions of the tank head 14 and tank bottom 15 are joined at section A in the figure.

A central pipe 16 is integrally molded with the tank head 14 and has a refrigerant inlet 17 and a refrigerant outlet 18.
The threaded portion of the can be directly molded or a metal insert can be used.

The above joining method may be selected according to the type of resin and usage conditions, but ultrasonic welding, high frequency welding, vibration welding, rotation welding, etc. are preferable in consideration of productivity and reliability. The optimal position and shape of part A should be selected depending on the welding method and usage conditions.

A sight glass is installed in the upper part of the tank head 14 at part B shown in FIG. 3 so that the condition of the refrigerant sealed in the receiver can be visually observed.
After the tank head 14 is molded, a plate-shaped sight glass 19 is fitted into the groove of the head, and a resin cap 20 is joined and fixed to the tank head 14 from above the sight glass 19.

This cap 20 may be provided with a through hole 21 as shown in FIG. 3, but the entire cap may be made of highly transparent methacrylic resin or the like.

At the time of joining, there is a gap between the sight glass 19 and the tank head 14 to improve sealing of the refrigerant.
Preferably, a sealing element (not shown) such as a ring is used.

About the sight glass The above example shows an example in which the cap is fixed to the tank head, but in the present invention, taking advantage of the fact that the liquid receiver body is made of resin, the sight glass 19 is installed as shown in Fig. 4. The sight glass 19 may be fixed to the upper part of the tank head 14 by placing it in the groove of the tank head 14 and caulking the ends of the tank head 14 made of resin using a method such as ultrasonic welding.

In this case, as shown in FIG. 5, the contrast can be omitted.

Note that the strainer 22 and the moisture absorbent 23 must be assembled before the tank head 14 and tank bottom 15 are joined.

The type of resin used for molding in the present invention is not particularly limited, but it is preferable to use polyamide resins such as nylon 66 and nylon 6, polybutylene tereftate, and each reinforcing grade, particularly glass fiber and/or inorganic filler. Polyamide reinforced by containing
The inventors of the present invention found that 66 resin is most suitable.

That is, the resin specifically exemplified above has mechanical strength that can withstand high refrigerant pressure at internal and external temperatures that occur during operation, chemical resistance to fluorocarbons and oil, and resistance to fluorocarbon permeation. It has been found that when the tank head 14 and tank bottom 15 are joined together to form the liquid receiver body, sufficient strength and airtightness can be obtained in the joint, and especially reinforced polyamide has high strength at high temperatures and excellent creep resistance. It is suitable as a molding resin for liquid receivers due to its high properties of stability and chemical stability.
It has been found that satisfactory results can be obtained even in joining such as high frequency welding.

The mixing ratio of glass fiber to polyamide 6/6 is 5 to 65% by weight, preferably 10 to 60% by weight. Specific examples of the inorganic filler include talc, clay, kaolin, wollastonite, and mica;・Mixing ratio for 6 is 5 to 65
% by weight, preferably 10-60% by weight. When both are used together, the total amount is 5 to 65% by weight, preferably 10 to 65% by weight.
It is 60% by weight. When departing from these ranges,
Mechanical strength and joint strength to withstand high refrigerant pressure,
This causes problems with airtightness, etc.

If a thermal stabilizer is further mixed into the resin (including reinforced resin), it will be even more advantageous under high temperature conditions.

As described above, according to the present invention, a liquid receiver suitable for a refrigerant in a cooling device, a refrigeration device, or an air conditioning device is obtained, and the receiver body is made of resin, and in particular, the receiver body is divided into two parts. However, since the head part and bottom part are each integrally molded from resin and then joined together, the head part and bottom part can be easily welded together.Furthermore, by making the cap made of resin, the cap can be easily welded. Although it is easy to connect the receiver body to the head part, by making the receiver body made of resin, the sight glass can be installed without using a cap as shown in Figures 4 and 5. By specifically selecting reinforced polyamide for the resin, it is lightweight and does not suffer from corrosion due to refrigerants.
It was possible to obtain a suitable refrigerant liquid receiver as described above, which has excellent mechanical strength.

Although the invention made by the present invention has been specifically explained above based on examples, the present invention is not limited to the above-mentioned examples, and various changes can be made without departing from the gist thereof. Needless to say.

For example, in the embodiment described above, the sight glass, moisture absorbent, and strainer are incorporated into the liquid receiver body, but these may be provided as separate devices (separate members) outside the liquid receiver body.

Further, in the present invention, in addition to the sight glass, moisture absorbent, strainer, etc. shown in the above embodiments, other members constituting the liquid receiver may be provided as necessary.

Furthermore, although the pipe is preferably molded integrally with the tank head from resin as in the previous embodiment, it may also be constructed from other materials and may be attached as a separate component.

Although the present invention has been mainly described above with respect to a liquid receiver for refrigerant in an automobile air-conditioning system, the present invention is not limited thereto and can be applied to other similar cooling, refrigeration, and air-conditioning systems.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of an example of a cooling device, Fig. 2 is a sectional view showing a conventional example, Fig. 3 is a sectional view showing an embodiment of the present invention, and Fig. 4 is an explanatory diagram of a method of installing a sight glass in the present invention. , FIG. 5 is a sectional view showing another embodiment of the present invention. 1... Liquid receiver (receiver), 14... Tank head (head part), 15... Tank bottom (bottom part), 16... Pipe, 19... Sight glass,
20...cap, 22...strainer, 23...
...Moisture absorbent.

Claims (1)

[Scope of Claims] 1. A liquid receiver for refrigerant in a cooling, refrigeration and air conditioning system, which includes a liquid receiver body made of resin, a pipe built into the liquid receiver body, and a pipe built into the main body or external to the main body. A sight glass, moisture absorbent, and
1. A liquid receiver for refrigerant in a cooling, refrigeration, and air conditioner, characterized by comprising a strainer. 2. The liquid receiver according to claim 1, wherein the liquid receiver main body is divided into a head part and a bottom part, and the head part and the bottom part, each molded from resin, are joined. 3 Polyamide 6.6 resin containing 5 to 65% by weight of glass fiber and/or inorganic filler
The liquid receiver according to claim 1 or 2, which is made of resin.