JPS6315090A - Evaporator of corrugated type - Google Patents

Abstract

PURPOSE:To make the temperature of a refrigerant uniform and to increase the heat exchanging rate of a refrigerant, by providing a passage inclined in the direction of a resultant force, consisting of the opposite direction to an air flow and the flowing direction of a refrigerant, in the nearly center part of the overall length of a flat tube, piercing through the wall of each refrigerant pipe, and by inserting a bar stock with a spiral guide around it in the inclined passage. CONSTITUTION:A passage 9 inclined in the direction of a resultant force, consisting of the opposite direction to an air flow and the flowing direction of a refrigernat, is provided in the nearly center part of the overall length of a flat tube 1, piercing through the wall 7 of each refrigerant pipe, and a bar stock 11 with a spiral guide 10 around it is inserted in the passage 9. Although a refrigerant near the inlet side A of an air flow is completely heat-exchanged, a refrigerant 6 near the outlet side B of an air flow is not fully heat-exchanged. But the temperature in an evaporator can be made uniform because the refrigerant 6 near the outlet side B of an air flow is fed to the parts of refrigerant pipes close to the inlet side A of an air flow as shown by an arrow sign 12 along the bar stock 11 provided nearly in the center part of the overall length of a flat tube 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heat exchanger for an air conditioner, and particularly to a corrugated evaporator suitable for an evaporator for a car air conditioner or a room air conditioner.

Background Art In recent years, various methods have been used to improve the performance of corrugated evaporators used in car air conditioners, room air conditioners, etc.

An example of a conventional corrugated evaporator will be described below with reference to the drawings.

FIG. 2 shows a conventional corrugated evaporator, in which a flat tube 1 having a plurality of refrigerant passages is bent and meandering. Reference numeral 2 denotes a corrugated fin, which is arranged between the parallel parts of the flat tube 1. Reference numeral 3 denotes a refrigerant inlet pipe, and 4 a refrigerant outlet pipe, which are disposed at the upper end of the flat tube 1 and are each brazed by furnace brazing or the like.

FIG. 3 shows a cross section of the main part of the flat tube 1.
8 is a refrigerant passage wall, and 8 is a passage formed by penetrating the refrigerant passage wall in parallel with the air flow.

The operation of the corrugated evaporator constructed as above will be explained below.

First, a refrigerant flows through the flat tube 1, air flows between the corrugated fins 2, heat exchanges between the air and the refrigerant, and the air is cooled. The refrigerant flows from the refrigerant inlet pipe 3 through the flat tube 1 to the refrigerant outlet pipe 4. The refrigerant flowing through the air inflow side A and the air outflow side B passes through the passage 8 and is partially mixed.

Problems to be Solved by the Invention However, in the conventional configuration described above, the refrigerant that has entered a certain refrigerant passage cannot be sufficiently mixed with the refrigerant flowing in other refrigerant passages, and the refrigerant near the air inlet side A The refrigerant flowing in the passage undergoes complete heat exchange and becomes dry steam at the outlet of the flat tube, losing its heat exchange ability.

Furthermore, the refrigerant flowing in the refrigerant passage near the air outflow side B is not sufficiently heat exchanged and is discharged in a liquid state, resulting in poor evaporator performance.

Means for Solving the Problems In order to solve the above-mentioned problems, the corrugated evaporator of the present invention has a flat tube at approximately the center of its entire length that is inclined in the direction of the resultant force of the anti-air flow direction and the refrigerant flow direction. A passage is formed through each refrigerant passage wall, and a rod-shaped member having a spiral guide on the outer periphery is inserted into the passage.

According to the above-described configuration, the present invention allows the refrigerant flowing in the refrigerant flow path of the flat tube to undergo sufficient heat exchange near the air outflow side by the rod-shaped member inserted into the passage formed by penetrating the refrigerant passage wall in the flat tube. The refrigerant that is not being used is supplied to the refrigerant passages near the sudden inflow side, and the temperature of the refrigerant flowing in each refrigerant passage is made uniform.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings, but components that are the same as the conventional ones are given the same reference numerals and detailed explanations thereof will be omitted.

In the flat tube 1 of the present invention, a passage 9 inclined in the direction of the resultant force of the anti-air inflow direction and the refrigerant flow direction is formed at approximately the center of the entire length of the tube, passing through each refrigerant passage wall 7. A rod-shaped member 11 having a spiral guide 1o on its outer periphery is inserted.

The refrigerant near the air inflow side A is completely heat exchanged, but the refrigerant 6 near the air outflow side B is not sufficiently heat exchanged. The refrigerant 6 near the air outflow side B is supplied to the refrigerant passage on the air inflow side A as indicated by an arrow 12 along the rod-shaped member 11 provided approximately at the center of the entire length of the flat tube 1, and is fed to the refrigerant passage on the air inflow side A, and is Temperatures are averaged.

Although the helical guide 1o in the embodiment is a helical fin, the same effect can be obtained by using a helical spring or a helical groove.

Effects of the Invention As described above, a passage is formed at approximately the center of the entire length of the flat tube, penetrating through each refrigerant passage wall and inclined in the direction of the resultant force of the anti-air inflow direction and the refrigerant flow direction, and a spiral is formed in this passage. By inserting a rod-shaped member having a shaped guide on the outer periphery, refrigerant near the air outflow side is supplied to the refrigerant passage near the air inflow side,
This has the effect of equalizing the temperature of the refrigerant flowing in each refrigerant passage and greatly increasing the heat exchange capacity.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a corrugated evaporator showing an embodiment of the present invention, FIG. 2 is a perspective view of a conventional corrugated evaporator, and FIG. 3 is a first diagram of a conventional corrugated evaporator. It is a sectional view of a corresponding part. 1...Flat tube, 2...Corrugated fin, 7...Refrigerant passage wall, 9...
Inclined passage, 1o...Spiral guide, 11...
...rod-shaped member. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure //- Figure 2 of the upper part

Claims (1)

[Claims] A flat tube having a plurality of refrigerant passages is bent in a meandering manner, and a corrugated fin is welded between the parallel parts of the bent flat tube, and a corrugated fin is welded between the parallel parts of the bent flat tube. A corrugated evaporator in which a passage is formed through each refrigerant passage wall and is inclined in the direction of the resultant force, and a rod-shaped member having a spiral guide on the outer periphery is inserted into the passage.