JPH09264556A - Heat-exchanger for air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a desired heat-exchange amount even when there is a an unevenness in the dispersion of an air velocity which passes through a heat- exchanger of an air conditioner. SOLUTION: When a refrigerant which flows into a heat exchanger tube 10 of a heat-exchanger, is divided into the top and the bottom from the center, a cut and erected piece 12 of a louver, etc., being formed on a plate fin 11 in the vicinity of a heat exchanger tube 10 right after the dividing on the side which is apt to become overheated, is crushed, or the surface of the plate fin 11 at this area is formed to be flat, or the number of the cut and erected pieces 12 such as louvers, or the number of protruding parts 13 are formed to be less than those of other areas, or on the plate fin 11 in the vicinity of the heat exchanger tube 10 right after the dividing, the protruding parts 13 are provided. In addition, the cut and erected piece 12 such as louvers are provided on the other areas to suppress the heat-exchange right after the dividing, and an overheating point is delayed. By this method, the balance of a heat-exchange amount for the top and the bottom becomes favorable, and the balance of the divided streams becomes favorable, and the heat-exchanging rate is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for an air conditioner, and more particularly, to a plate fin structure for improving a heat exchange rate.

[0002]

2. Description of the Related Art A heat exchanger (also called an indoor heat exchanger) 6 as shown in FIG. 1, for example, is provided on the indoor unit side of a separation type air conditioner.
An indoor blower (cross flow fan) 7 is arranged in an air passage 4 connecting the suction port 2 in the upper part of the housing and the air outlet 3 in the lower part of the housing. The heat exchanger 6 has a two-row configuration as shown in FIGS. 1 and 2, and has an upper heat exchanger 6a whose front surface is inclined forward of the air passage 4 and is connected to the upper part of the upper heat exchanger 6a. And the rear heat exchanger 6b inclined rearward of the air passage 4
And a lower heat exchanger 6c which is continuously provided in a lower portion of the upper heat exchanger 6a and is erected substantially vertically, or FIG.
As shown in FIG. 5B, it is generally composed of an upper heat exchanger 6a and a lower heat exchanger 6c which are formed in a substantially V shape, and these are arranged at predetermined intervals as shown in FIG. And a plurality of plate fins 11 stacked in parallel, a plurality of hairpin-shaped heat transfer tubes 10 inserted orthogonally to the plate fins 11, a connecting tube 14 that connects the open ends of these heat transfer tubes 10 in order, For the plate fins 11, for example, louver-shaped cut-and-raised parts 12 as shown in FIG. 6 or surface area (heat exchange area)
And a plurality of through holes 15 for inserting the heat transfer tubes 10 at predetermined intervals.

By the way, in the indoor unit as shown in FIG. 1, the wind speed passing through the heat exchanger 6 is different depending on the positions a, b, c, d as shown in FIGS. 2 and 3, and there are variations in the wind speed. This affects the heat exchange of each part and reduces the total heat exchange amount. Therefore, in the conventional heat exchanger 6, the inlet of the refrigerant (during cooling operation) is defined as the windward side of the upper heat exchanger 6a, and the branch pipe 9 is provided there to split the refrigerant up and down.
The refrigerant headed to the upper part is circulated through the rear heat exchanger 6b and then directed to the outlet located on the lower lee side of the upper heat exchanger 6a, while the refrigerant headed from the branch pipe 9 to the lower part is the lower heat exchanger. After going through 6c once, it is directed toward the outlet located on the upper leeward side of the lower heat exchanger 6c, and the wind shield 16 is provided in front of the upper portion of the upper heat exchanger 6a to prevent the air volume passing through the upper portion. It was designed to reduce overheating of the refrigerant in the upper part and balance the upper and lower heat exchange amounts.

[0004]

However, it takes a considerable amount of time to position the inlet and outlet of the refrigerant before the heat exchanger as described above is obtained, and the wind shield 1
By providing 6 or the like, there is a problem that the cost is increased and the heat exchange in the upper part is suppressed, so that the heat exchange amount of the entire heat exchanger cannot be increased. Therefore, the present invention provides a heat exchanger for an air conditioner that can balance the upper and lower heat exchange amounts without increasing the effort and without using a windshield, etc., and can improve the heat exchange rate. The purpose is to do.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has a plurality of plate fins having a plurality of through holes and louvers or protrusions and laminated in parallel at a predetermined interval. And a plurality of hairpin-shaped heat transfer tubes inserted into the through holes of the laminated plate fins,
In a heat exchanger of an air conditioner consisting of a connecting pipe that connects the open ends of these heat transfer pipes in order, when the refrigerant flowing through the heat transfer pipe is split up and down from the center, immediately after the splitting on the side that becomes overheated. Decrease the ventilation resistance around the heat transfer tube, and as a means for that, crush the louvers formed on each plate fin around the heat transfer tube immediately after the diversion, or place each in the vicinity of the heat transfer tube immediately after the diversion. The surface of the plate fins may be formed flat, or the number of louvers of each plate fin located around the heat transfer tube immediately after the diversion may be smaller than that of the other parts, or the transmission immediately after the diversion may be performed. The number of protrusions of each plate fin located around the heat tube is formed to be smaller than that of other parts, or each plate fin located around the heat transfer tube immediately after the diverting. The projecting is provided, and to providing a cut and raised louvers such other sites.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A heat exchanger of an air conditioner includes a plate fin having a plurality of through holes and louvers or protrusions, which are stacked in parallel at a predetermined interval, and inserted into the through holes of the stacked plate fins. A plurality of hairpin-shaped heat transfer tubes and a connecting tube that connects the open ends of these heat transfer tubes in order are arranged so that the refrigerant flowing into the heat transfer tubes is diverted vertically from the center by a branch pipe. On the other hand, there are variations in the amount of air passing through each part of the heat exchanger, and due to that,
One of the vertically divided refrigerants may become overheated and the other may become wet. Therefore, in the present invention, the cut-and-raised parts such as louvers formed on the plate fins around the heat transfer tube immediately after the diverting on the side where overheating is crushed are crushed, or Make the plate fin surface flat, cut and raise louvers or the like formed at that part, or make the number of protrusions smaller than that at other parts, or plate fins around the heat transfer tube immediately after the flow diversion Protrusions are provided on the other side, and cut-and-raised parts such as louvers are provided on other parts to reduce ventilation resistance, suppress heat exchange immediately after shunting on the side that overheats, delay the overheating of the refrigerant, and raise and lower the heat exchanger. The heat exchange rate is improved by balancing the flow rate of the refrigerant split into two.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Figure 1 shows the internal structure of the indoor unit.
Reference numeral 1 is a housing (indoor unit main body), 2 is an inlet for indoor air, and 3 is an outlet for indoors. A detachable air filter 5, a heat exchanger 6 and an indoor blower (cross flow fan) 7 are arranged in an air passage 4 connecting the suction port 2 and the air outlet 3, and the air outlet 3 has a wind direction to the room. A wind direction adjusting plate 8 that adjusts up and down is provided. The heat exchanger 6 has an upper heat exchanger 6a whose front surface is inclined forward of the air passage 4, and a rear heat exchanger which is connected to an upper portion of the upper heat exchanger 6a and inclined rearward of the air passage 4. 6b, and a lower heat exchanger 6c which is continuously provided in a lower portion of the upper heat exchanger 6a and stands upright almost vertically.

FIG. 2 shows a pipe connection state of the heat exchanger 6. The refrigerant flowing into the heat exchanger 6 during the cooling operation is vertically moved by a branch pipe 9 provided on the windward side of the upper heat exchanger 6a. The refrigerant that has been split into the upper part and headed to the upper part is the rear heat exchanger 6
After going around b, it goes to the outlet located at the lower leeward side of the upper heat exchanger 6a, while the refrigerant going from the branch pipe 9 to the lower side goes around the lower heat exchanger 6c and then goes to this lower heat exchanger. It goes to an outlet located at the upper part on the leeward side of 6c, merges with the above-mentioned refrigerant from the upper part near this outlet, and returns to the compressor via a four-way valve (not shown). By the way, the wind speed passing through each part of the heat exchanger 6 is as shown in FIG.
Assuming that the wind speed distribution is not constant but proportional to the distribution of the heat exchange amount, the heat exchange amount between the upper part and the lower part of the heat exchanger 6 is a + b> c + d, and the heat exchange is large (the wind speed is The refrigerant becomes overheated at the upper part.

Therefore, in this embodiment, the plate fins 1 on the periphery of the heat transfer tube 10 immediately after the shunting on the side where the overheating occurs.
Crush the cut-and-raised parts 12 such as the louver formed in 1, or
This portion is formed flat from the beginning as shown in FIG. 4 (A), or the number of cut-and-raised portions 12 such as louvers formed at that portion is reduced as shown in FIG. 4 (B). Alternatively, as shown in FIG. 4 (C), the number of protrusions 13 may be smaller than that of other portions, or alternatively, each plate fin 11 around the heat transfer tube immediately after the flow diversion may be provided with (( The protrusion 13 as shown in C) is provided, and the cut-and-raised part 12 such as a louver is provided at another portion, so as to suppress heat exchange immediately after the diversion of the overheated side.

With such a configuration, the balance of the flow rate of the refrigerant split vertically from the branch pipe 9 is improved, and the heat exchanger 6
The overall heat exchange rate can be improved. Even when the heat exchanger 6 is composed of an upper heat exchanger 6a and a lower heat exchanger 6c which are formed in a substantially V shape as shown in FIG. When the exchange amount is different, the above-mentioned means can be used to balance the upper and lower heat exchange amounts after the split flow.

[0011]

EFFECT OF THE INVENTION The heat exchanger as described above can shorten the examination time required to bring out the desired performance, and can well balance the upper and lower heat exchange amounts without using the wind shield. In addition, since the balance of the diversion is improved, the heat exchange rate is improved, and comfortable air conditioning can be performed.

[Brief description of drawings]

FIG. 1 is an internal configuration diagram of an indoor unit according to the present invention and a conventional example.

FIG. 2 is a side view of a heat exchanger according to the present invention and a conventional example.

FIG. 3 is a wind velocity distribution diagram for a heat exchanger according to the present invention and a conventional example.

FIG. 4 is an enlarged view of a main part of a plate fin according to the present invention.

FIG. 5 is a schematic configuration diagram of a heat exchanger according to the present invention and a conventional example.

FIG. 6 is a schematic configuration diagram of a plate fin used in a conventional heat exchanger.

[Explanation of symbols]

 2 Suction port 3 Blow-out port 6 Heat exchanger 7 Indoor blower (Cross flow fan) 9 Branch pipe 10 Heat transfer pipe 11 Plate fin 12 Cut and raised 13 Protruding 14 Connecting pipe 15 Hole

Claims (6)

[Claims] 1. A plate fin having a plurality of through holes and louvers or protrusions, which are stacked in parallel at a predetermined interval, and a plurality of hairpin-shaped heat transfer tubes inserted into the through holes of the stacked plate fins. In the heat exchanger of the air conditioner consisting of a connecting pipe that connects the open ends of these heat transfer pipes in order, when the refrigerant flowing in the heat transfer pipe is split up and down from the center, the split flow on the side that overheats A heat exchanger for an air conditioner characterized by reducing ventilation resistance around the heat transfer tube immediately after. 2. A means for reducing the ventilation resistance,
The heat exchanger for an air conditioner according to claim 1, wherein the louvers formed on the plate fins around the heat transfer tube immediately after the split flow are crushed. 3. A means for reducing the ventilation resistance,
The heat exchanger of an air conditioner according to claim 1, wherein the surface of each plate fin located around the heat transfer tube immediately after the split flow is formed flat. 4. A means for reducing the ventilation resistance,
The heat exchanger of an air conditioner according to claim 1, wherein the number of louvers of each plate fin located around the heat transfer tube immediately after the split flow is smaller than that of other portions. 5. As a means for reducing the ventilation resistance,
The heat exchanger of an air conditioner according to claim 1, wherein the number of protrusions of each plate fin located around the heat transfer tube immediately after the branching is smaller than that of other portions. 6. A means for reducing the ventilation resistance,
2. The heat exchanger for an air conditioner according to claim 1, wherein each plate fin located around the heat transfer tube immediately after the split flow is provided with a protrusion, and a cut-and-raised portion such as a louver is provided at another portion.