JP2017172906A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger which can suppress the drift current of a coolant flowing into each heat exchange tube by a small number of component members.SOLUTION: A heat exchanger includes: a pair of header pipes horizontally facing each other; a plurality of heat exchange tubes in parallel to each other, connected to both header pipes; a partition plate vertically partitioning a space in one header pipe of both header pipes; and an upper side heat exchange region and a lower side heat exchange region partitioned into both header pipes and the plurality of heat exchange tubes by the partition plate. A joint 20 connecting the header pipe 11 with a coolant flow pipe is formed by a cylindrical tube 22 whose tip is blocked and which is inserted into an opposite side to a side in which the heat exchange tube 2 is connected in the header pipe 11, and an upward coolant flow hole 23 which opens only at the top edge on a vertical line orthogonal to the flow direction of the coolant is provided on the tip part of the joint.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a heat exchanger including a pair of header pipes and a plurality of parallel heat exchange tubes connected to both header pipes.

  Generally, this type of heat exchanger has a pair of header pipes and a plurality of flat heat exchange tubes connected to both header pipes, and is widely used as a heat exchanger for car air conditioners and room air conditioners. Has been.

  As this type of conventional heat exchanger, a pair of header pipes facing left and right, a plurality of parallel heat exchange tubes connected to the two header pipes, and a space in one header pipe of the two header pipes There is known a heat exchanger that includes a partition plate that is vertically partitioned, and an upper heat exchange region and a lower heat exchange region that are partitioned by the partition plate into the two header pipes and the plurality of heat exchange tubes. When this heat exchanger is used as an evaporator, the refrigerant flows in from the lower part of the heat exchanger and is discharged from the upper part.

  In this case, the refrigerant near the evaporator inlet is separated into gas and liquid when distributed to the heat exchange tubes in the header pipe with the gas phase and the liquid phase mixed together, and the amount of refrigerant flowing into each heat exchange tube is reduced. There is a difference. In particular, when heat exchangers are used with header pipes arranged on the left and right, a large amount of refrigerant flows into the lower heat exchange tubes in the upper and lower heat exchange tubes in the same circuit (refrigerant circulation circuit). It will end up.

  In particular, the number of inverter-type models of recent room air conditioners is increasing, and when the amount of refrigerant circulation fluctuates and the amount of refrigerant circulation is small, a relatively large amount of refrigerant flows into the lower heat exchange tube, and the drift is noticeable. Become.

  As a means for suppressing the drift of the refrigerant, the first space and the first space between the first space on the side where the refrigerant inflow opening of the header pipe is provided and the second space on the side where the heat exchange tube is connected are provided. There is known a heat exchanger provided with a pressure loss adding member in which an opening communicating two spaces is formed (see, for example, Patent Document 1).

  In the heat exchanger described in Patent Literature 1, the size of the area of the opening of the pressure loss adding member is set to the upstream side and the downstream side of the pressure loss adding member according to the amount of refrigerant flowing into the first space. The refrigerant drift is suppressed under the condition that the pressure difference is set to a size that produces a predetermined pressure difference.

JP 2014-12673 A

  However, in the heat exchanger described in Patent Document 1, the refrigerant that has flowed into the first space from the pipe connected to the refrigerant inflow opening collides with the pressure loss addition member, and is divided into four sides to form the opening and the second space. Therefore, there is a concern that the heat is not uniformly distributed to each heat exchange tube.

  Further, in the heat exchanger described in Patent Document 1, a structure in which a pressure loss adding member is inserted into the header pipe, the header pipe is partitioned into a first space and a second space, and an opening is provided in the pressure loss adding member. Therefore, there is a concern that the structure is complicated and the incorporation into the header pipe is troublesome.

  This invention was made in view of the said situation, and makes it a subject to provide the heat exchanger which can aim at suppression of the drift of the refrigerant | coolant which flows into each heat exchange tube with few structural members.

  In order to achieve the above object, a heat exchanger according to the present invention includes a pair of header pipes facing left and right, a plurality of parallel heat exchange tubes connected to the two header pipes, and one of the two header pipes. A heat exchanger comprising: a partition plate that vertically divides a space in the header pipe; and an upper heat exchange region and a lower heat exchange region that are partitioned by the partition plate into the two header pipes and the plurality of heat exchange tubes And comprising a joint that connects the lower heat exchange region of the header pipe and a refrigerant inflow pipe, and the joint is inserted on the opposite side of the header pipe to the side to which the heat exchange tube is connected. And is formed of a cylindrical tube with a closed end, and opens upward at the upper end of a vertical line perpendicular to the refrigerant flow direction at the end of the joint. Refrigerant circulation hole is provided, characterized in that (claim 1). In this case, there may be a plurality of the refrigerant circulation holes as long as they open upward only at the upper end on the vertical line orthogonal to the flow direction of the refrigerant. Claim 2).

  By configuring in this way, the refrigerant flowing into the header pipe via the joint flows upward in the header pipe from the upward refrigerant circulation hole that opens only at the upper end on the vertical line perpendicular to the refrigerant flow direction. By flowing, the refrigerant speed in a mixed state of the gas phase and the liquid phase increases, and it becomes easier for the liquid phase refrigerant that normally does not reach the upper part due to gravity to reach the upper part and flows to the upper heat exchange tube It becomes easy.

  In this invention, it is preferable that the joint is inserted on the lower side in the lower heat exchange region.

  With this configuration, the refrigerant flowing in the header pipe flows from the lower side to the upper side of the header pipe, so that the refrigerant can be distributed and flowed to the heat exchange tubes arranged vertically.

  Moreover, in this invention, when the said refrigerant | coolant circulation hole is one, it is preferable that the refrigerant | coolant circulation hole is located on the axial center of the said header pipe (Claim 4).

  By comprising in this way, a refrigerant | coolant flows into the cross-sectional center part of a header pipe, and flows into each heat exchange tube.

  According to this invention, since it is configured as described above, it is possible to easily assemble a heat exchanger that can suppress the drift of the refrigerant flowing to each heat exchange tube with a small number of components.

It is a schematic front view which shows the heat exchanger which concerns on this invention. It is sectional drawing which shows the principal part of 1st Embodiment of this invention. It is sectional drawing which follows the II line | wire of FIG. It is a cross-sectional perspective view which shows the principal part of 1st Embodiment of this invention. It is sectional drawing which shows the connection state to the header pipe of another embodiment of the coupling in this invention. It is a schematic front view which shows another embodiment of the heat exchanger which concerns on this invention.

  EMBODIMENT OF THE INVENTION Below, the form for implementing the heat exchanger which concerns on this invention is demonstrated in detail based on an accompanying drawing. Here, the case where the heat exchanger which concerns on this invention is applied to the outdoor unit of a room air conditioner is demonstrated.

  As shown in FIG. 1, the heat exchanger 1 according to the present invention includes a first header pipe 11 and a second header pipe, which are a pair of header pipes that are made of aluminum (including an aluminum alloy) and face each other. Header pipe 12, a plurality of flat aluminum heat exchange tubes 2 connected to both header pipes 11 and 12, and aluminum corrugated fins 3 interposed between adjacent heat exchange tubes 2 above and below And. In this case, the heat exchange tube 2 is formed in a flat oval shape, and a plurality of refrigerant flow paths 2a are defined in the width direction orthogonal to the longitudinal direction of the heat exchange tube 2 (see FIG. 4). A side plate 7 made of an aluminum (including aluminum alloy) member is connected to both header pipes 11 and 12 on the upper and lower sides of the uppermost and lowermost heat exchange tubes 2.

  The first and second header pipes 11 and 12 are formed of an aluminum cylindrical electric sewing tube or an extrusion-molded tube, and the upper and lower opening ends are respectively closed by an aluminum end cap 5. Yes. Moreover, the partition plate 4 is provided in the corresponding intermediate part in the 1st header pipe 11, and the upper side space 11a and the lower side space 11b are divided by this partition plate 4 up and down.

  An upper heat exchange region 6A is formed by the heat exchange tube 2 connected to the partitioned upper space 11a, and a lower heat exchange region 6B is formed by the heat exchange tube 2 connected to the lower space 11b. That is, the upper heat exchange region 6 </ b> A is formed by the plurality of heat exchange tubes 2 that connect the upper space 11 a of the first header pipe 11 and the upper space in the second header pipe 12. The lower heat exchange region 6B is formed by a plurality of heat exchange tubes 2 that connect the lower space 11b of the first header pipe 11 and the lower space in the second header pipe 12.

  A refrigerant outflow pipe 14 is connected to the upper space 11a of the first header pipe 11, and a joint, which will be described later, is provided below the intermediate portion in the height direction of the lower space 11b of the first header pipe 11. A refrigerant inflow pipe 13 is connected via 20. In this case, the joint 20 is inserted on the opposite side of the first header pipe 11 to the side to which the heat exchange tube 2 is connected, and is fixed to the first header pipe 11 via the brazing material.

  The joint 20 has a connecting portion 21 of the refrigerant inflow pipe 13 at one end, and is formed of an aluminum cylindrical pipe 22 bent in an elbow shape with the other end closed, and the tip of the cylindrical pipe 22 is formed. The part is formed with an upward refrigerant circulation hole 23 that opens only at the upper end on a vertical line perpendicular to the refrigerant flow direction.

  In this case, the coolant circulation hole 23 is formed in a circular shape, but may have a shape other than a circle, for example, an elliptical shape, a long hole shape, or a slit shape.

  The joint 20 configured as described above is a lower side in the lower heat exchange region 6B, and is inserted in a side opposite to the side to which the heat exchange tube 2 in the first header pipe 11 is connected, The coolant circulation hole 23 is disposed at a position on the axial center C of the first header pipe 11 (see FIG. 3). In FIG. 3, the axial center C of the header pipe 11 and a vertical line perpendicular to the refrigerant flow direction in the cylindrical tube 22 appear on the same axis. Thereby, the refrigerant can flow into the central portion of the cross section in the first header pipe 11.

In the heat exchanger 1 configured as described above, the liquid or gas-liquid two-phase refrigerant flowing from the refrigerant inflow pipe 13 via the joint 20 is inserted into the lower side in the lower heat exchange region 6B. The center section of the cross section in the first header pipe 11 from one upward upward refrigerant circulation hole 23 opened only at the upper end on the vertical line perpendicular to the refrigerant flow direction provided at the tip of the cylindrical pipe 22 And flows into each heat exchange tube 2 in the lower heat exchange region 6B.
Therefore, even if the circulation amount of the refrigerant is small, a large amount of refrigerant does not flow into the lower heat exchange tube 2, so that the drift of the refrigerant flowing to each heat exchange tube 2 can be suppressed.

  While the refrigerant flows through the refrigerant flow path 2a of each heat exchange tube 2 in the lower heat exchange region 6B, the refrigerant absorbs heat from the outdoor air and evaporates to become a gas-liquid mixed state in the lower space of the second header pipe 12. Join. The refrigerant merged in the lower space flows through the refrigerant flow path 2a of each heat exchange tube 2 in the upper heat exchange area 6A, merges in the upper space 11a of the first header pipe 11, and merges in the upper space 11a. Flows out from the refrigerant outflow pipe 14.

  In the first embodiment, the case has been described in which the joint 20 is formed by the cylindrical tube 22 bent in an elbow shape with its tip closed, but the joint is not necessarily bent in an elbow shape. Good. For example, the joint 20A may be formed of a straight aluminum cylindrical tube 22A having a closed end. In this case, as shown in FIG. 5, a refrigerant inflow pipe connecting portion 21 having an enlarged diameter is formed on the opening side of the other end with respect to the distal end side of the cylindrical pipe 22A.

  The tip end side of the cylindrical tube 22A thus formed is inserted through a brazing material in a state of being inserted through an insertion hole 11c provided on the opposite side of the first header pipe 11 to the side to which the heat exchange tube 2 is connected. The stainless steel refrigerant inflow pipe 13 is inserted into the expanded refrigerant inflow pipe connecting portion 21 and fixed through a brazing material to connect the cylindrical tube 22A, that is, the joint 20A and the refrigerant inflow pipe connecting portion 21. To do. In FIG. 5, the other parts are the same as those in the above embodiment, so the same parts are denoted by the same reference numerals and description thereof is omitted.

  In the first embodiment, the case where the first header pipe 11 is partitioned into the upper space 11a and the lower space 11b by the partition plate 4 has been described. However, as shown in FIG. May be partitioned into an upper space 12a and a lower space 12b by a partition plate 4A to form an upper heat exchange region 6A and a lower heat exchange region 6B.

  When formed as described above, it is necessary to connect the upper space 12 a and the lower space 12 b of the second header pipe 12 using the connection pipe 15. In this case, the connecting pipe 15 and the upper space 12a of the second header pipe 12 can be connected using the joint 20A formed as described above. That is, the straight cylindrical tube 22A forming the joint 20A is inserted into the lower side in the upper space 12a of the second header pipe 12 and fixed through the brazing material, and the connecting portion with the expanded diameter of the cylindrical tube 22A is fixed. The joint pipe 15 can be fixed to 21A via a brazing material, and the joint 20A and the joint pipe 15 can be connected.

  By configuring in this way, the refrigerant that merged in the lower space 12b of the second header pipe 12 flows into the upper space 12a of the second header pipe 12 via the connection pipe 15 and the joint 20A. The refrigerant is distributed uniformly in the upper space 12a by the refrigerant flow holes 23 provided in the joint 20A. In FIG. 6, the other parts are the same as those in the above embodiment, and therefore the same parts are denoted by the same reference numerals and description thereof is omitted.

According to the heat exchanger 1 of the embodiment configured as described above, the refrigerant flowing into the first header pipe 11 is provided at the distal end portion of the cylindrical tube 22 located on the connection side of the heat exchange tube 2. By flowing upward in the first header pipe 11 from the upward refrigerant circulation hole 23 that opens only at the upper end on the vertical line orthogonal to the flow direction, the gas phase and the liquid phase are mixed together with the rise. The gas and liquid in the refrigerant separate and flow to each heat exchange tube.
Therefore, it is possible to suppress a large amount of refrigerant from flowing into the lower heat exchange tube 2 and causing drift.

  In addition, the refrigerant drift suppression unit can be configured with a small number of components, and the refrigerant drift suppression unit can be easily assembled to the heat exchanger.

  Although the said embodiment demonstrated the case where the heat exchanger which concerns on this invention was applied to the outdoor unit of a room air conditioner, the heat exchanger which concerns on this invention is applicable also to the evaporator of a car air conditioner.

2 Heat exchange tube 4 Partition plate 6A Upper heat exchange area 6B Lower heat exchange area 11 First header pipe 12 Second header pipe 13 Refrigerant inflow pipe 20, 20A Joint 22, 22A Cylindrical pipe 23 Refrigerant flow hole C Center of axis

Claims (4)

A pair of header pipes facing left and right, a plurality of parallel heat exchange tubes connected to the two header pipes, a partition plate for vertically partitioning a space in one header pipe of the two header pipes, and the partition plate An upper heat exchange region and a lower heat exchange region partitioned into the two header pipes and the plurality of heat exchange tubes by the heat exchanger,
Comprising a joint connecting the lower heat exchange region of the header pipe and the refrigerant inflow pipe;
The joint is formed of a cylindrical pipe inserted on the opposite side of the header pipe to the side to which the heat exchange tube is connected, and having a closed end.
An upward refrigerant circulation hole that opens only at the upper end on a vertical line orthogonal to the refrigerant flow direction is provided at the tip of the joint.
A heat exchanger characterized by that. The heat exchanger according to claim 1,
The heat exchanger according to claim 1, wherein the number of the refrigerant circulation holes is one. The heat exchanger according to claim 1 or 2,
The said joint is inserted in the downward side in the said lower side heat exchange area | region, The heat exchanger characterized by the above-mentioned. The heat exchanger according to claim 2,
The heat exchanger according to claim 1, wherein the refrigerant circulation hole is located on an axial center of the header pipe.

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