JPH08193761A - High-pressure container for non-azeotropic mixed refrigerant - Google Patents

Abstract

(57) [Abstract] [Purpose] To realize a high-pressure container that can transfer non-azeotropic mixed refrigerant without changing its composition. [Structure] By providing a movable wall 13 inside the container 10 or by deforming the entire container 10, the internal volume of the container 10 is decreased according to the decrease of the refrigerant inside, and the ratio of gas-liquid is kept constant, and the taken-out refrigerant is taken out. To prevent compositional fluctuations.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure container used for filling a non-azeotropic mixed refrigerant into an air conditioner.

[0002]

2. Description of the Related Art Conventionally, a mixed refrigerant that has been used for an air conditioner is an azeotropic refrigerant such as R502. Therefore, even if it is treated like an ordinary single refrigerant, there is a problem that the mixed composition changes. I didn't. In addition, even when a non-azeotropic mixed refrigerant is used, if a cylinder of a single composition is used and the cylinders are separately filled, compositional deviation does not matter.

[0003]

However, in the above situation, there are the following problems.

At present, a refrigerant that does not destroy the ozone layer is being developed from the viewpoint of protecting the global environment. As a strong candidate, HFC mixed refrigerant, R407C (R32 / R125 / R1
34a = 23/25/52 [wt%]), R404A
(R125 // R143a / R134a = 44/52 /
4 [wt%]), etc., and they are used as alternatives to the conventional R22, R502, etc., respectively.

However, since these refrigerants are non-azeotropic mixed refrigerants, when they are housed in an ordinary pressure resistant container, the mixed composition differs between the liquid part and the gas part. Therefore, when a container with a small amount of remaining refrigerant is used, the composition of the low boiling point component becomes lower than the initial filling composition when the contents of the container are extracted from the liquid portion, and the predetermined refrigerating capacity cannot be obtained in the refrigeration cycle. There is. Therefore, it was necessary to finish the use of the cylinder with a certain amount of refrigerant left.

[0006]

In order to solve the above problems, the present invention is provided with a movable wall capable of varying the internal volume of the container, and moves the movable wall according to the remaining amount of the non-azeotropic mixed refrigerant in the container. It is a high-pressure container for a non-azeotropic mixed refrigerant having a mechanism.
Further, another high-pressure container of the present invention is a non-azeotropic container having a structure in which the inner volume is changed according to the remaining amount of the non-azeotropic mixed refrigerant in the container by changing the axial length of the cylindrical container. It is a high-pressure container for mixed refrigerants.

[0007]

The present invention has the following functions due to the above-mentioned structure.

That is, the movable wall is provided with a movable wall capable of changing the inner volume of the container, and the movable wall is moved according to the remaining amount of the non-azeotropic mixed refrigerant in the container to change the volume of the refrigerant accommodating portion in the container. By keeping the gas / liquid ratio of the non-azeotropic mixed refrigerant to be the same as in the initial state, the fluctuation of the refrigerant composition in the liquid refrigerant can be kept within a certain limit and the amount of usable refrigerant can be increased.

Further, in another high-pressure container according to the present invention, the axial length of the cylindrical container is changed so that the internal volume is changed according to the remaining amount of the non-azeotropic mixed refrigerant in the container. By keeping the gas-liquid ratio of the azeotropic mixed refrigerant at the same level as in the initial state, the fluctuation of the refrigerant composition in the liquid refrigerant can be kept within a certain limit and the amount of usable refrigerant can be increased.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, 10 is a high pressure vessel, 11 is a main valve, 12 is a non-azeotropic mixed refrigerant, 13 is a movable wall, and 14 is a movable wall drive mechanism. Initial use, non-azeotropic mixed refrigerant 12
Almost fills the inside of the container. However, when the liquid refrigerant is used from the main valve 11, for example, in the case of R407C filled in a normal container, the composition of R134a in the taken-out refrigerant shows a change as shown in FIG. 3, which is 90% of the internal volume. When it is used, it is 2% higher than the initial value, and when it is used in the refrigeration cycle, the capacity is reduced by about 2%, and its effect cannot be ignored. Therefore, the movable wall 13 is moved by a movable wall drive mechanism 14 (for example, a piston and a cylinder, not shown) in accordance with the decrease of the non-azeotropic mixed refrigerant 12 to reduce the volume of the refrigerant storage portion, and the same gas as in the initial stage of use. If the liquid volume ratio is maintained, the compositional change which is a problem in the non-azeotropic mixed refrigerant does not occur. Because the root of the problem caused by non-azeotrope is the difference between the composition of gas and liquid. This difference is determined by the temperature and pressure, and if the volume is kept constant, the composition does not change. Conventionally, the volume of the container was constant even if the amount of residual refrigerant decreased, so the volume was relatively increased, but according to the present invention, the relative volume was constant, and the change in composition due to the change in residual amount. Will not occur.

Next, a second embodiment of the present invention will be described with reference to the drawings. In FIG. 2, 20 is a high-pressure container, 21 is a main valve, 22 is a non-azeotropic mixed refrigerant, 23 is a bellows part, and 24 is a drive mechanism. At the beginning of use, the non-azeotropic mixed refrigerant 22 substantially fills the inside of the container. However, when the liquid refrigerant is used from the main valve 21, for example, in the case of R407C filled in an ordinary container, R13 in the taken out refrigerant is
The composition of 4a shows a change as shown in Fig. 3, which is 90% of the internal volume.
When used in the refrigeration cycle, the capacity decreases by about 2% compared to the initial stage, and the effect cannot be ignored. Therefore, the bellows portion 23 is deformed by a drive mechanism 24 (for example, a piston and a cylinder, not shown) in accordance with the decrease of the non-azeotropic mixed refrigerant 22, and the volume in the high-pressure container 20 is decreased, and the same gas / liquid as in the initial stage of use is used. If the volume ratio is maintained, the compositional change which is a problem in the non-azeotropic mixed refrigerant does not occur. Because the root of the problem caused by non-azeotrope is the difference between the composition of gas and liquid. This difference is determined by the temperature and pressure, and if the volume is kept constant, the composition does not change. Conventionally, the volume of the container has been constant because the volume of the remaining refrigerant has decreased, so the volume has increased relatively. However, according to the present invention, the relative volume becomes constant and the composition does not change due to the change in the residual amount.

[0013]

As is apparent from the above embodiments, the high-pressure container for non-azeotropic mixed refrigerant of the present invention is provided with a movable wall capable of varying the internal volume of the container and a mechanism for moving the movable wall, or of a cylindrical container. Equipped with a mechanism for changing the axial length, the internal volume is changed according to the remaining amount of the non-azeotropic mixed refrigerant in the container, and the gas / liquid ratio of the non-azeotropic mixed refrigerant in the container is the same as in the initial state. By maintaining the above value, it is possible to increase the amount of the refrigerant that can be used within the allowable range of composition fluctuation from the non-azeotropic mixed refrigerant in the container.

[Brief description of drawings]

FIG. 1 is a schematic view of a container according to a first embodiment of the present invention.

FIG. 2 is a schematic view of a container according to a second embodiment of the present invention.

FIG. 3 is a characteristic diagram showing a relationship between a taken-out refrigerant amount and a taken-out refrigerant composition in a conventional example.

[Explanation of symbols]

 10 High-pressure container 11 Main valve 12 Non-azeotropic mixed refrigerant

Claims (2)

[Claims] 1. A high-pressure container for non-azeotropic mixed refrigerant, comprising a movable wall capable of changing the internal volume of the container, and having a mechanism for moving the movable wall according to the remaining amount of the non-azeotropic mixed refrigerant in the container. 2. A high-pressure container for non-azeotropic mixed refrigerant, comprising a mechanism for changing the axial length of the cylindrical container to change the internal volume according to the remaining amount of the non-azeotropic mixed refrigerant in the container.