JPH02225999A - Heat exchanger - Google Patents

Abstract

PURPOSE:To prevent the rise of liquid surface level of liquid refrigerant at the bottom of a header and to efficiently perform heat exchange by diffusing up gas refrigerant at least in a lower half of the header not provided with a refrigerant outlet. CONSTITUTION:The interior of a header 1A is partitioned into upper and lower sections by a partition wall 13 provided at a slightly lower position than its center, a refrigerant inlet 11 is provided at the upper end of the header 1A and a refrigerant outlet 12 is provided at the lower end. On the other hand, a partition wall 14 is provided at the position corresponding to the wall 13 in a header 1B, a cylindrical part 15 protruding downward is formed at the center of the wall 14, and its end is extended to the vicinity of the bottom wall of the header 1B of the lowermost position. Gas refrigerant fed from the inlet 11 is fed from the upper chamber 1a of the header 1A to the top 1c of the header 1B through a tube 2, fed through the part 15, collided with the bottom wall of the header to be diffused up, fed in the tube 2, and sent from the outlet 12 at the lower chamber 1b of the header 1A.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heat exchanger, and particularly to a header type heat exchanger that is efficiently used as a condenser in an air conditioning cycle.

[Prior Art] Header type heat exchangers have attracted attention because they are easy to manufacture and have good heat exchange efficiency (for example, Japanese Patent Laid-Open No. 63-3446
6), whose schematic structure is shown in FIG.

In the figure, large-diameter tubular headers IA provided at left and right positions,
18, small diameter tubes 2 are disposed vertically in parallel with both ends connected to these opposing side walls, and corrugated heat radiation fins 3 are provided between these tubes 2. The inside of the header IA is divided into upper and lower parts, and a gas refrigerant is supplied to the upper chamber 1a from a refrigerant port 11 provided at the upper end. The supplied gaseous refrigerant flows through the tube 2 connecting the upper chamber 1a and the header IB, and is cooled during this time and reaches the header IB.

The gaseous refrigerant flows downward in header IB and into another tube 2.
and then reaches the lower chamber 1b of the header IA. During this time, the entire amount of the gas refrigerant is cooled and condensed to become a liquid refrigerant, which is then sent out from the refrigerant outlet 12 provided at the lower end.

[Problems to be Solved by the Invention] By the way, a part of the gaseous refrigerant is condensed and liquefied in the tube 2 extending from the header IA to the header IB, and falls together with the gaseous refrigerant inside the header IB. Depending on the conditions on the refrigerant outlet side, the 8th liquid may accumulate at the bottom of the header and increase its level.
L> in the figure, the lower end and the inside of the tube 2 near this may be filled with liquid refrigerant. If such a situation occurs,
Gaseous refrigerant cannot flow through the tubes 2 filled with liquid refrigerant, and the actual number of tubes that contribute to heat exchange is reduced, resulting in a reduction in heat exchange efficiency.

The present invention solves this problem, and aims to provide a heat exchanger that can effectively prevent a rise in the level of liquid refrigerant accumulated at the bottom of a header and avoid a decrease in heat exchange efficiency. .

[Means for Solving the Problems] To explain the configuration of the present invention with reference to FIG. 1, a plurality of tubes are installed between the headers IA and 18 installed vertically at left and right positions, with both ends connected to the side walls of each header IA and IB. 2 are installed in parallel in the vertical direction, and radiating fins 3 are provided between these tubes 2, so that the gas that is supplied from the refrigerant port 11 provided in either of the headers IA and IB and flows through each of the tubes 2 is provided. The heat exchanger that condenses the refrigerant into a liquid and sends it out from the refrigerant outlet 12 provided in either of the headers IA or IB is at least the lower half of the header IA that is not provided with the refrigerant outlet 12 among the headers IA and IB. It is characterized by a structure in which the gaseous refrigerant is blown upward from below.

[Function] In the heat exchanger having the above configuration, the gaseous refrigerant blows upward from below at least within the lower end portion of the header IB where the refrigerant outlet 12 is not provided. Therefore, the liquid refrigerant accumulated at the bottom of the header IB is blown up together with the gas refrigerant, and the liquid level does not increase. Therefore, the problem of liquid refrigerant entering and clogging the tube 2 at the lower end and close thereto does not occur, and heat exchange efficiency is maintained at a good level.

[In the first embodiment shown in FIG. 1, there are large-diameter cylindrical headers IA at the left and right positions,
IB is erected, and a large number of small diameter tubes 2 are provided in the vertical direction by connecting the opposing side walls of these headers IA and IB. Each tube 2 is arranged in parallel, and a corrugated heat radiation fin 3 is provided between them.

The inside of the header IA is divided into upper and lower parts by a partition wall 13 provided slightly below the center, and a refrigerant inlet 11 is provided at the upper end of the header IA, and a refrigerant outlet 12 is provided at the lower end.
is the provision. On the other hand, a partition wall 14 is provided inside the header IB at a position corresponding to the partition wall 13, and a circular cylindrical portion 15 projecting downward is formed in the center of the partition wall 14 (see FIG. 2). , FIG. 3), its tip extends downward from the lowest tube and reaches near the bottom wall of header IB.

In the heat exchanger having the above structure, the gaseous refrigerant flowing from the refrigerant port 11 passes through the upper chamber 1a of the header IA, the retube 2, and reaches the upper chamber IC of the header IB, and then changes its direction downward and enters the cylindrical portion 15. flows, hits the bottom wall of the header, changes direction, and blows upward (arrows in Figures 1 and 2). The blown up gaseous refrigerant flows through the tubes 2 through the openings of each tube 2 connected to the lower chamber 1d, reaches the lower chamber 1b of the header IA, and is sent out from the refrigerant outlet 12.

The gas refrigerant is tube 2 from Helada IA to header IB.
While flowing through the air, heat is exchanged with the air flowing through the radiation fins 3, and a part of the air is condensed and liquefied.

The liquid refrigerant falls along with the gas refrigerant inside the header IB and accumulates at the bottom of the header (see the box in Figures 1 and 2).At this point, the gas refrigerant changes its direction upward and blows up, turning it into a gas refrigerant. It is mixed and rolled up, and as a result,
The refrigerant liquid level at the bottom of the header does not rise.

The gas refrigerant mixed with liquid refrigerant is blown up and flows through the tube 2 from the header IB to the header IA,
The entire amount is condensed and liquefied by heat exchange during this time.

According to the heat exchanger having the above structure, since the rise in the refrigerant liquid level is suppressed, there is no problem that the liquid refrigerant flows into the tube at the lower position and fills the tube and blocks it. The tube contributes to heat exchange and efficient heat exchange is performed.

This effect is shown in FIG. In the figure, the line X is the present invention, and the line y is the conventional example. The larger it is, the more significant it is.

[Second Embodiment] When it is possible to provide the refrigerant population 11 at the lower end of the header, the structure of the heat exchanger is as shown in FIG.
It is only necessary to move the inner partition wall 13 slightly upward from the center to ensure the number of tubes through which the high-temperature gas refrigerant flows.

In the figure, the gaseous refrigerant that has flowed into the lower chamber 1b of the header IA passes through the tube 2 and reaches the header IB, and is blown up inside the header IB (arrow in the figure). Although a portion of the gas refrigerant liquefies while flowing through the tube 2, this liquid refrigerant is rolled up inside the header IB together with the gas refrigerant, and as a result, the rise in the refrigerant liquid level at the bottom of the header is suppressed. The entire amount of the gaseous refrigerant containing the liquid refrigerant is liquefied in the tube 2 leading from the header IB to the header IA.
The refrigerant reaches the upper chamber 1a of A and is sent out from the refrigerant outlet 12 at the upper end of the header.

Such a structure also provides the same effects as the above embodiment.

[Third Embodiment] If the refrigerant inlet and refrigerant outlet can be installed only on the side of the header, the structure shown in FIG. 6 can be used.

That is, the refrigerant inlet 11 is opened in the side wall of the header IA, and the refrigerant outlet 12 is a refrigerant outlet 12 that joins a plurality of tubes 2 at the center and is drawn out to the side of the header IAO.

The gaseous refrigerant flowing into the header IA from the refrigerant population 11 is divided into upper and lower portions, and flows through the tubes 2 at the upper and lower positions, respectively, and reaches the header IB. Therefore, the gas refrigerant is
In the upper half of the header, the flow flows downward toward the tube 2 located at the center, but in the lower half, the flow flows upward toward the tube 2 (arrow in the figure), and the liquid refrigerant accumulated at the bottom of the header is caused by the upward flow It is rolled up to prevent its liquid level from rising.

This embodiment also provides the same effects as the above embodiments.

[Effects of the Invention] As described above, the heat exchanger of the present invention has a structure in which gaseous refrigerant is blown up at least in the lower half of the header which does not have a refrigerant outlet, so that the liquid level of the liquid refrigerant accumulated at the bottom of the header increases. By preventing tubes from clogging with liquid refrigerant, efficient heat exchange is possible.

[Brief explanation of the drawing]

Figures 1 to 4 show a first embodiment of the present invention, in which Figure 1 is a schematic sectional view of the entire heat exchanger, Figure 2 is an enlarged sectional view of the lower half of the header, and Figure 3 is an enlarged sectional view of the lower half of the header. A perspective view, FIG. 4 is a graph showing the heat radiation effect, FIG. 5 is an overall schematic sectional view of a heat exchanger showing a second embodiment of the present invention, and FIG. 6 is a heat exchanger showing a third embodiment of the present invention. 7 and 8 show a conventional example, and FIG. 7 is a schematic sectional view of the entire heat exchanger,
FIG. 8 is an enlarged sectional view of the lower half of the header. IA, IB...Header 11...Refrigerant inlet 12...Refrigerant outlet 13.14...Partition wall 15...Cylinder part 2...Tube 3...Radiation fin Surface wind speed (m/S)

Claims (1)

[Claims] Between the headers installed on the left and right positions, a plurality of tubes are installed in parallel in the vertical direction with both ends connected to the side walls of each header, and radiation fins are provided between these tubes.
A heat exchanger that condenses a gaseous refrigerant supplied from a refrigerant inlet provided in one of the headers and flowing through each of the tubes into a liquid, and sends it out from a refrigerant outlet provided in any one of the headers. A heat exchanger characterized in that the gas refrigerant is blown upward from the bottom at least in the lower half of the header which is not provided with a refrigerant outlet.