JP2015203506A - heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adjust diversion of a parallel flow type heat exchanger using a flat tube whose hole diameter of a refrigerant flow passage is small.SOLUTION: A heat exchanger includes: a plurality of flat pipes 5 arranged in parallel; a fin 6 provided between the flat tubes 5; and two headers 2, 3 provided at both ends of the flat pipe 5. The headers 2, 3 includes a plurality of partition walls 10 provided at positions where the headers are opposite to each other, and sectioning the header 2 or the header 3 in a longitudinal direction, the headers 2, 3 can be sectioned into a plurality of small sections, and thereby diversion is easy to be adjusted.

Description

  The present invention relates to a parallel flow heat exchanger.

  In general, a parallel flow heat exchanger includes two headers arranged in parallel at intervals, a plurality of flat tubes disposed between the two headers, and provided with a plurality of refrigerant flow paths therein. It is comprised from the several fin arrange | positioned at the flat surface of a pipe | tube. The air flows between the fins and exchanges heat with the refrigerant in the flat tube.

  Parallel flow type heat exchangers are said to have higher heat exchange efficiency between refrigerant and air than fin and tube type heat exchangers. This is because the parallel flow type heat exchanger can provide a plurality of refrigerant channels in the flat tube, and can increase the heat transfer area in the flat tube. However, since the cross-sectional area of each refrigerant flow path in the flat tube is small, there is a problem that it is easily affected by the amount of refrigerant circulation and it is difficult to match the flow.

  Therefore, a partition member that partitions the space in the header into a flat tube side space and an anti-flat tube side space is provided, and the partition member is provided with a plurality of communication portions that communicate the flat tube side space and the anti-flat tube side space. It has been proposed to arrange a small communication portion with a small flow area above the partition member (see, for example, Patent Document 1).

JP 2004-353936 A

  However, if the hole diameter of the refrigerant flow path becomes very small like a flat tube, the refrigerant diverted state collapses with a slight resistance. It was not enough to divide it into an anti-flat tube side space. In other words, the refrigerant that has passed through the communication portion provided in the partition member rejoins with the refrigerant that has passed through the adjacent communication portion in the header, and there is a problem that the refrigerant cannot be uniformly distributed to all the flat tubes. .

  In particular, when a parallel flow heat exchanger is used in an indoor unit of an air conditioner, drain water generated when the heat exchanger is used as an evaporator needs to be discharged outside the indoor unit. However, there is a problem that the refrigerant after passing through the communication portion provided in the partition member is easily displaced due to the influence of the inclination of the indoor unit and the refrigerant does not flow sufficiently. there were.

  The present invention comprises a plurality of flat tubes arranged side by side, fins provided between the plurality of flat tubes, and two headers provided at both ends of the flat tubes, the two headers At least one of these includes a partition plate that divides the header in the longitudinal direction between the flat tubes having the same flow direction of the fluid flowing in the flat tube.

  As a result, the diversion state of the refrigerant can be stabilized.

1 is a front sectional view of a heat exchanger according to Embodiment 1 of the present invention. Sectional drawing of the flat tube in embodiment of this invention The principal part perspective view of the heat exchanger in embodiment of this invention. Front sectional drawing of the heat exchanger in Embodiment 2 of this invention. Front sectional drawing of the heat exchanger in Embodiment 2 of this invention.

  A first invention includes a plurality of flat tubes arranged side by side, fins provided between the plurality of flat tubes, and two headers provided at both ends of the flat tubes. At least one of the headers includes a partition plate that divides the header in the longitudinal direction between the flat tubes having the same flow direction of the fluid flowing in the flat tube.

  With this configuration, the diversion and gas balance of the entire heat exchanger is not disrupted, and it is possible to prevent a reduction in the capacity of the heat exchanger.

  According to a second invention, in the first invention, the header is a double pipe provided with an outer pipe and an inner pipe provided in the outer pipe, and the inner pipe is partitioned by the plurality of partition plates. Each of the spaces is provided with a coolant hole that opens.

  With this configuration, by adjusting the size of the refrigerant hole, the amount of refrigerant flowing into the space partitioned by the partition plate can be adjusted, and the diversion of the entire heat exchanger can be improved.

  In a third aspect based on the first aspect, the two headers are provided with the partition plates at positions facing each other.

  With this configuration, the diversion and gas balance of the entire heat exchanger is not disrupted, and it is possible to prevent a reduction in the capacity of the heat exchanger.

  According to a fourth aspect, in the second aspect, in the header that becomes the inlet side when operating as an evaporator among the two headers, the plurality of refrigerant holes have smaller hole diameters closer to the refrigerant inlet. Is.

  Since the refrigerant tends to flow into the refrigerant hole on the inlet side of the heat exchanger, this configuration makes it difficult for the refrigerant to flow into the refrigerant hole on the inlet side, and the refrigerant easily flows into the refrigerant hole far from the inlet. The overall diversion can be improved.

(Embodiment 1)
1 is a front cross-sectional view of a heat exchanger according to Embodiment 1. FIG. FIG. 2 is a cross-sectional view of the flat tube 5. FIG. 3 is a main part perspective view illustrating only two flat tubes 5 of the heat exchanger 1 and fins 6 therebetween.

  In FIG. 1, the heat exchanger 1 includes a header 2 and a header 3 arranged at intervals, and a flat tube 5 disposed between the header 2 and the header 3. The axial directions of the header 2 and the header 3 are respectively arranged in the horizontal direction with respect to the ground, and the longitudinal direction of the flat tube 5 is arranged in the vertical direction.

  As shown in FIG. 3, a plurality of fins 6 are provided on the flat surfaces of the plurality of flat tubes 5. For example, a corrugated fin can be used as the fin 6.

  As shown in FIG. 2, the flat tube 5 includes a plurality of refrigerant channels 4 inside, and the refrigerant channels 4 communicate with the inside of the header 2 and the inside of the header 3, respectively.

  The header 2 and the header 3 are double pipe type headers each composed of an outer tube 7 and an inner tube 8 provided in the outer tube 7. The inner pipe 8 is provided with a plurality of refrigerant holes 9. One end of the inner pipe 8 is provided with a pipe connection port for connecting pipes.

  When the number of refrigerant holes 9 provided in the inner pipe 8 is N, (N−1) partition plates 10 are arranged so that the inside of the outer pipe 7 is divided into N small sections (blocks). It is fixed by brazing between the tube 7 and the inner tube 8. The partition plate 10 is a flat plate-like member provided perpendicularly to the axial direction of the header, and divides the header into N blocks in the axial direction. The partition plate 10 includes a hole that allows the inner tube 8 to pass through at a substantially central portion.

  The header 2 and the header 3 are each provided with a partition plate 10 at a position facing each other. That is, the partition plate 10 is also provided in the header 3 at the position where the partition plate 10 of the header 2 is provided.

  The operation of the heat exchanger having such a configuration will be described. The refrigerant that has flowed in from the pipe (not shown) connected to the end of the inner pipe 8 of the header 2 (or the header 3) flows out into the outer pipe 7 from the refrigerant hole 9. The refrigerant flows into the blocks partitioned by the partition plate 10. Thereafter, the refrigerant flows through the refrigerant flow paths 4 of the plurality of flat tubes 5 communicating with each block. At this time, the refrigerant and air exchange heat through the fins 6.

  The refrigerant that has flowed out of the plurality of flat tubes 5 flows into the block defined by the partition plate 10 of the header 3 (or the header 2). Then, the refrigerant that has flowed out of the refrigerant hole 9 into the inner pipe 8 flows out from the end of the inner pipe 8 to a pipe (not shown) connected to the heat exchanger 1.

  In the present embodiment, since no partition plate is provided in the inner pipe 8, the refrigerant flowing in from the header 2 (or header 3) flows in parallel in all the flat pipes 5 and the header 3 (or Reach header 2).

  That is, the header 2 (or the header 3) includes the partition plate 10 between the flat tubes 5 having the same flow direction of the refrigerant flowing in the flat tubes 5.

  According to the heat exchanger having such a configuration, since the header 2 and the header 3 are partitioned into a plurality of blocks by the partition plate 10, the deviation of the refrigerant only fluctuates within each block. The header 2 and the header 3 as a whole do not change significantly. For this reason, since the diversion of a heat exchanger can be maintained favorable, the capability fall of a heat exchanger can be suppressed.

  In particular, when the heat exchanger 1 is employed for heat exchange of the indoor unit, the indoor unit is tilted to either the left or right side in order to discharge drain water. By being divided into blocks, the diversion changes only within the block and does not change greatly in the header 2 and the header 3 as a whole, and the diversion of the heat exchanger can be maintained.

  In the present embodiment, the header 2 and the header 3 have been described as including the partition plate 10 at positions facing each other. However, either the header 2 or the header 3, for example, an evaporator When operating, the partition plate 10 may be provided only on the header on the inlet side. This is because, if the diversion of the heat exchanger is adjusted mainly when the heat exchanger operates as an evaporator, the diversion is likely to be uniform even when operating as a condenser (or radiator).

  However, if the hole diameter of the refrigerant flow path 4 is very small like the flat pipe 5 and the refrigerant does not flow easily, the flow of the refrigerant is greatly inclined even if the pressure loss in the header 2 and the header 3 slightly fluctuates. Therefore, even under the condition of operating as a condenser (or radiator), the gas balance is lost. Therefore, it is desirable that both the header 2 and the header 3 are divided into a plurality of blocks.

  Further, another partition plate is provided in the inner pipe 8 at the same position as a part of the partition plates 10, and the refrigerant flowing from the header 2 (or the header 3) and flowing through the plurality of flat tubes is U-turned to form a plurality of You may form the flow path which returns to the header 3 (or header 2) again through a flat tube.

  Although a quadrangular shape is adopted for the refrigerant flow path 4 of the flat tube 5, the refrigerant flow path 4 may be circular or triangular.

(Embodiment 2)
FIG. 4 is a front cross-sectional view of the heat exchanger in the second embodiment. In the present embodiment, only differences from the first embodiment will be described.

  As shown in FIG. 4, in the second embodiment, when the heat exchanger 1 is operated as an evaporator, the refrigerant hole 9 provided in the header 2 on the inlet side is made smaller as it is closer to the evaporator inlet side, The distance increases from the entrance side. That is, the refrigerant hole 9 has a smaller hole diameter toward the side where the pipe connection port of the header 2 is provided.

  According to this, since the refrigerant easily flows into the refrigerant hole at the inlet of the header, by reducing the refrigerant hole on the inlet side, the refrigerant flows into the refrigerant hole farther than the inlet, and the flow distribution is adjusted more uniformly. it can.

  The reason for changing the size of the refrigerant hole 9 in this way only to the header 2 is that if the size of the refrigerant hole 9 of the header 3 is changed, the header on the outlet side when operating as an evaporator. 3, the refrigerant is squeezed, the refrigerant pressure loss is increased, the saturation temperature of the heat exchanger is lowered, the temperature difference between the air and the refrigerant cannot be taken, and the heat exchange capability is reduced. Because.

  Further, when the heat exchanger 1 operates as a condenser, the header 2 can squeeze the refrigerant at the header on the outlet side of the condenser, but it can be supercooled and does not adversely affect the performance. However, the conditions for operating as a condenser are affected by the size of the refrigerant hole 9 of the header 2 and the ease of flow of the refrigerant flowing in from the header 3 also changes. It is desirable to arrange. According to this, the gas balance of the whole heat exchanger 1 is not greatly broken. As described above, the gas balance of the entire heat exchanger 1 can also be adjusted by adjusting the refrigerant hole 9 of the header 2 on the outlet side when operating as a condenser.

  In the present embodiment, the refrigerant flows from one side of the header 2 and the header 3, but the refrigerant flows from both sides of the header 2 and the header 3 as shown in FIG. The refrigerant hole 9 near the both ends where the refrigerant easily flows into the refrigerant inlet side may be small, and the central refrigerant hole 9 of the header 2 may be enlarged.

According to the present invention, in the parallel flow type heat exchanger, it is possible to stabilize the diversion state of the refrigerant, and thus it is possible to provide a heat exchanger with higher performance. For this reason, the heat exchanger of the present invention can be applied not only to home air conditioners but also to commercial air conditioners and the like.

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2, 3 Header 4 Refrigerant flow path 5 Flat tube 6 Fin 7 Outer tube 8 Inner tube 9 Refrigerant hole 10 Partition plate

Claims (4)

A plurality of flat tubes arranged side by side; fins provided between the plurality of flat tubes; and two headers provided at both ends of the flat tubes; and at least one of the two headers One of the heat exchangers includes a partition plate that divides the header in the longitudinal direction between the flat tubes having the same flow direction of the fluid flowing in the flat tubes. The header is a double tube including an outer tube and an inner tube provided in the outer tube, and the inner tube includes a refrigerant hole that opens in each of the spaces defined by the partition plate. The heat exchanger according to claim 1. The heat exchanger according to claim 1, wherein the two headers are provided with the partition plates at positions facing each other. 3. The heat according to claim 2, wherein, among the two headers, in the header which becomes an inlet side when operating as an evaporator, the plurality of refrigerant holes have smaller hole diameters as being closer to the refrigerant inlet. Exchanger.