JPH0245732Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The invention relates to an evaporator used in refrigerators, etc.
In particular, the present invention relates to a so-called single-inlet evaporator in which there is only one connecting pipe to the evaporator and a capillary tube is disposed inside.

Conventional Structure and Problems Conventionally, as shown in Figs. 1 and 2, the evaporator 1 was constructed by applying a release material to prevent welding between two aluminum or stainless steel plates after rolling. A refrigerant passage 2 is formed by applying pressure with a fluid, and the refrigerant passage 2 has a narrow portion 4 adjacent to the open end 3, and a suction pipe 6 having a capillary tube 5 therein for heat exchange. is welded to the open end 3, and only the capillary tube 5 is allowed to pass through the narrow portion 4 and opened. Therefore, the refrigerant flows from the capillary tube 5 to the refrigerant passage 2.
After completing one cycle, the air is sent back to the electric compressor (not shown) through the suction pipe 6.

In such a configuration, the narrow portion 4 in the refrigerant passage 2
The gap between the capillary tube 5 and the capillary tube 5 must be brought into close contact with each other by means of a crimping mold or the like (crimped portion 7) to ensure that the refrigerant does not flow back into the suction pipe 5 through the narrow portion 4. However, due to the method of forming the refrigerant passage 2, there is a large dimensional error on the inner surface of the narrow part 4, and therefore the capillary tube 5 and the narrow part 4 are not tightly attached by the crimping mold, and leakage occurs inside the evaporator 1. There are problems such as insufficient evaporation of the refrigerant during the evaporation process, resulting in performance deterioration, and the crimping mold also crimping the capillary tube 5, blocking the capillary tube 5 and making the evaporator 1 unusable. It was hot.

Purpose of the invention The purpose of the invention is to securely bring the narrow part of the refrigerant passage into close contact with the capillary tube, eliminate refrigerant leakage, and obtain a highly efficient cooling circuit.

Structure of the invention In order to achieve this objective, the present invention ensures airtightness between the narrow part of the refrigerant passage of the evaporator and the capillary by pouring adhesive into the gap between the narrow part of the refrigerant passage and the capillary after crimping. It is something that gives you sex.

DESCRIPTION OF EMBODIMENTS FIGS. 3 and 4 are diagrams showing an embodiment of the present invention. In the figure, 8 is an evaporator, 9 is a refrigerant passage formed by conventional means, and 10 is an open end thereof. Reference numeral 11 denotes a narrow portion formed by caulking close to this open end 10. At the open end 10,
A suction pipe 13 is connected by welding. A capillary tube 12 is installed inside the suction pipe 13, passes through the narrow portion 11, and opens in the refrigerant passage 9 upstream thereof. Reference numeral 14 indicates a caulked portion made in the narrow portion 11. 15 is a hole made in the narrow part 11 of the caulking part 14, and the formation of the caulking part 14 creates a gap 15a.
is formed. An adhesive 16 is injected into the narrow portion 11 and around the capillary tube 12 through the hole 15.

In the above configuration, the refrigerant goes around the refrigerant passage 9 from the capillary tube 12 as shown by the arrow in FIG. 3, and is sent back to the compressor through the suction pipe 13. At this time, the refrigerant flowing from the capillary tube 12 flows into the adhesive 1
6 through the narrow portion 11 and does not return to the suction pipe 13, sufficient heat exchange can be achieved within the refrigerant passage 9. Furthermore, since the adhesive 16 is filled in the narrow part 11 between the caulking parts 14, there is a filling space gap 15a for the adhesive 16, and reliable filling is possible. The airtightness is further improved by use.

Effects of the invention As is clear from the above explanation, the invention provides a hole for injecting adhesive between the narrow part of the refrigerant passage and the capillary tube, and fills the gap between the capillary tube and the narrow part with adhesive. This can prevent the refrigerant from being short-circuited directly from the capillary tube to the suction pipe and returning to the compressor, resulting in the effect of improving the efficiency of the evaporator.

[Brief explanation of the drawing]

Figure 1 is a front view partially showing a conventional single-inlet evaporator, Figure 2 is an enlarged view of its main parts,
Fig. 3 is a front view of a single inlet evaporator showing an embodiment of the present invention, and Fig. 4 is a -
FIG. 8... Single inlet evaporator, 9... Refrigerant passage, 10... Open end, 11... Narrow portion, 12...
... Capillary tube, 13 ... Suction tube, 15 ... Hole, 16 ...
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Claims (1)

[Scope of utility model registration request] A refrigerant passage formed between two plates made of aluminum, stainless steel, etc., a suction pipe connected to the open end of the refrigerant passage, and a suction pipe inserted into the suction pipe to communicate with the refrigerant passage and close to the open end. 1. A single inlet evaporator comprising: a capillary tube fixed in a narrow portion formed by the above method; an adhesive to be filled around the outer periphery of the capillary tube in the narrow portion; and a hole for filling the adhesive.