JPH07269991A - Refrigerating cycle - Google Patents

Abstract

PURPOSE:To enable a superior keeping of a flow passage of refrigerant ranging from a capillary tube to an evaporator to be attained even in the case that refrigerant easily producing some foreign materials is used and to enable a cooling performance to be kept well. CONSTITUTION:In a refrigerating cycle in which refrigerant is supplied from a capillary tube 14 to an evaporator, a side hole 17 is formed near a terminal end of the capillary tube, a part having the side hole 17 is positioned within an inlet pipe 19 of an evaporator and communicated with it, thereby a flowing- out of the refrigerant when a foreign material C is apt to be crystalized at the terminal end of the capillary tube 14 is assured by the side hole 17. In addition, in this case, a total opening area of the side hole 17 is set to be more than an area of a terminal end opening 18 of the capillary tube, thereby a flowing-out characteristic of the refrigerant from the side hole 17 can be assured more.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration cycle suitable as an alternative CFC specification.

[0002]

2. Description of the Related Art Conventionally, fluorocarbons such as R-12 have been used as a refrigerant for a refrigerating cycle of a refrigerator, for example. However, in recent years, it has been pointed out that when this type of CFC gas is released into the atmosphere, it adversely affects the ozone layer in the stratosphere, and there is a demand to stop the use of CFCs. Therefore, instead of the conventional Freon, R-13
It has been considered to use so-called alternative CFCs such as 4a.

[0003]

According to experiments and research conducted by the present inventors, when an alternative CFC such as R-134a is used as the refrigerant, rust preventive oil, processing oil, cleaning agent, etc. in the compressor oil are not produced. It has been found that a chemical reaction occurs, and further, dust in the refrigeration cycle, molecular sieve powder, metal powder, etc. undergo a chemical reaction, and a foreign substance (for example, a metal salt of carboxylic acid) usually called contamination is easily generated. And it is the capillary tube 1 shown in FIG. 4 of the refrigeration cycle.
It has been found that in the part from the to the evaporator 2, the refrigerant is likely to be deposited in the outflow part of the refrigerant into the evaporator 2, that is, the terminal part of the capillary tube 1.

The foreign matter C thus deposited is
When it is used for a long period of time, it gradually accumulates and narrows the flow path of the refrigerant, resulting in deterioration of cooling performance. In the worst case, it may even block the flow path of the refrigerant.

The present invention has been made in view of the above circumstances. Therefore, an object of the present invention is to improve the flow path of the refrigerant from the capillary tube to the evaporator even when a refrigerant that easily produces foreign substances is used. To provide a refrigeration cycle that can be secured.

[0006]

To achieve the above object, in the refrigeration cycle of the present invention, a refrigeration cycle in which a refrigerant is supplied from a capillary tube to an evaporator is provided with a side hole near the end of the capillary tube. Is formed, and the portion in which the side hole is formed is positioned inside the inlet pipe of the evaporator to communicate with each other. In this case, the total opening area of the side holes may be set to be equal to or larger than the terminal opening area of the capillary tube.

[0007]

According to the above means, if foreign matter is deposited on the end portion of the capillary tube, the internal pressure of the capillary tube increases and the refrigerant flows out from the side hole, so that the flow path of the refrigerant is secured. . Further, if this happens, foreign matter will be deposited on any of the side hole portions, but the foreign matter will be deposited on the end portion of the capillary tube by that amount, and the balance of the foreign matter will reduce the flow path of the refrigerant. It can be secured to the extent that it does not hinder distribution.

Particularly, in the case where the total opening area of the side holes is set to be equal to or larger than the end opening area of the capillary tube, the refrigerant flows out from the side holes when foreign matter is deposited on the end part of the capillary tube. It is possible to further secure the property.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is applied to a refrigerating cycle for a refrigerator, and one embodiment thereof will be described below with reference to FIGS. First, FIG. 3 shows the entire configuration of a refrigeration cycle for a refrigerator, which includes a compressor 11 and a radiator 1
2, the dryer 13, the capillary tube 14, the evaporator 15, the accumulator 16, and the compressor 11 are connected in a closed loop.

In the refrigeration cycle, a CFC alternative, such as R-134a, which does not adversely affect the ozone layer, is enclosed as a refrigerant. The refrigerant is compressed by the compressor 11 and radiated by the radiator 12 to radiate heat. Then, moisture is removed by the dryer 13, and the evaporator 1 is removed from the capillary tube 14.
5, the evaporator 15 vaporizes the heat to remove heat from the surrounding air, and then returns to the compressor 11 through the accumulator 16 to repeat the process, thereby cooling the inside of the refrigerator.

Here, FIG. 1 shows in detail the structure of the portion from the capillary tube 14 to the evaporator 15 in the refrigeration cycle, in which a side hole 17 is provided near the end of the capillary tube 14 and the flow direction of the refrigerant. As shown in FIG. 2, four pieces are formed in each of the two rows. In this case, two side holes 17 are formed symmetrically so that the workability of the perforation is improved.

The total opening area (S1) of the side holes 17 is the area (S2) of the terminal opening 18 of the capillary tube 14.
The above is determined (S1 ≧ S2), and specifically, the inner diameter of the terminal opening 18 of the capillary tube 14 is 0.7 mmφ.
On the other hand, the inner diameter of each side hole 17 is 0.3 m.
This is achieved by setting mφ. Further, the side hole 17 has a downstream row at a position 10 mm from the end of the capillary tube 14, and a downstream row to an upstream row at 5 mm.

Thus, the portion near the end of the capillary tube 14 in which the side hole 17 is formed in this way is located in the inlet pipe 19 from the throttle port 20 portion of the inlet pipe 19 of the evaporator 15 by about 20 mm in size, Aperture 2
By welding 21 at the zero end, the inlet pipe 19 and thus the evaporator 15 are connected, and the side hole 17 is communicated with the terminal end opening 18 of the capillary tube 14 into the evaporator 15. In addition, in this case, the inlet pipe 19 is connected to the evaporator 15 at a terminal portion (not shown) as a separate body from the evaporator 15.

The refrigerant used in the refrigeration cycle is R-
When an alternative CFC such as 134a is used, a foreign substance usually called contamination is generated, which is the capillary tube 1.
As described above, in the portion from 4 to the evaporator 15, the refrigerant easily precipitates at the terminal end portion of the capillary tube 14, which is the refrigerant outflow portion into the evaporator 15.

On the other hand, in the case of the above-mentioned structure, as shown in FIG. 1, if the foreign matter C is deposited on the end portion of the capillary tube 14, the internal pressure of the capillary tube 14 increases and the refrigerant is It comes to flow out from the side hole 17, thus ensuring the flow path of the refrigerant. Further, in this case, the foreign matter C will be deposited on any of the side holes 17, but the capillary tube 14 is correspondingly correspondingly deposited.
Since the precipitation of the foreign matter C at the terminal end of is reduced, it is possible to secure the flow path of the refrigerant to the extent that the flow of the refrigerant is not hindered by the balance thereof. Therefore, the cooling performance can be maintained well, and it is possible to prevent the foreign matter C from blocking the refrigerant flow path.

In addition, particularly in the above-mentioned structure, the side hole 1
The total opening area of 7 is the end opening 1 of the capillary tube 14.
The area is set to 8 or more, and thereby, the outflow of the refrigerant from the side hole 17 when the foreign matter C comes to be deposited on the terminal end portion of the capillary tube 14 can be further secured, The cooling performance can be maintained even better.

The inlet pipe 19 is the evaporator 15
It may be one with. Further, the present invention can be applied to the refrigerating cycle such as a freezer showcase or an air conditioner in the same manner as the refrigerator. And further,
The dimensions and the like of each part are not limited as described above.

[0018]

The refrigeration cycle of the present invention is as described above, and has the following effects. First, in a refrigeration cycle in which a refrigerant is supplied from a capillary tube to an evaporator, a side hole is formed near the end of the capillary tube, and the part where the side hole is formed is located inside the inlet pipe of the evaporator to communicate with each other. As a result, even when a refrigerant that easily generates foreign matter is used, the flow path of the refrigerant from the capillary tube to the evaporator can be well secured, and the cooling performance can be kept good.

Secondly, since the total opening area of the side holes is set to be equal to or larger than the end opening area of the capillary tube, the foreign matter from the side holes when foreign matters are deposited on the end part of the capillary tube is detected. The outflow property of the refrigerant can be further ensured, and the cooling performance can be more favorably maintained.

[Brief description of drawings]

FIG. 1 is a sectional view of a main portion showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a block diagram of the entire refrigeration cycle

FIG. 4 is a view corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

14 is a capillary tube, 15 is an evaporator, 17
Is a side hole, 18 is a terminal opening of the capillary tube, and 19 is an inlet pipe of the evaporator.

Claims (2)

[Claims] 1. In a refrigeration cycle for supplying a refrigerant from a capillary tube to an evaporator, a side hole is formed in the vicinity of a terminal end of the capillary tube, and a portion formed with the side hole is located in an inlet pipe of the evaporator for communication. Refrigeration cycle characterized by 2. The total opening area of the side holes is set to be equal to or larger than the terminal opening area of the capillary tube.
Refrigeration cycle described.