JP2015113983A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain, in a heat exchanger in which plural heat exchange elements have plural flat tubes lined vertically and are arranged in multiple rows via a turn-round header, the efficiency of the heat exchanger by preventing the occurence of liquid stagnation in the turn-round header and letting a gas-liquid two phase refrigerant flow equally into the respective flat tubes of the heat exchanger elements on the downstream side.SOLUTION: A heat exchanger comprises: first heat exchange elements 1 having plural flat tubes 1A lined vertically; second heat exchange elements 2 having plural flat tubes 2A lined vertically; a turn-round header 3 which connects one ends 1Z of the first heat exchange elements 1 with one ends 2Z of the second heat exchange elements 2 to turningly introduce the refrigerant passed through the first heat exchange elements 1 into the second heat exchange elements 2. The turn-round header 3 has plural refrigerant turn-round spaces 3A divided vertically, and one of the first flat tubes 1A and one of the second flat tubes 2A communicate with each of the refrigerant turn-round spaces 3A.

Description

  The present invention relates to a heat exchanger.

  Conventionally, as shown in Patent Document 1, there is a heat exchanger in which a plurality of heat exchange elements having a plurality of flat tubes arranged in the vertical direction are arranged in multiple rows via a folded header. In the folded header of such a heat exchanger, the refrigerant that has passed through the plurality of flat tubes in the upstream heat exchange element is collected in one space in the folded header, and the plurality of flat tubes in the downstream heat exchange element is collected. Redistributed and introduced.

  However, in the heat exchanger as described above, as shown in FIG. 9, the gas-liquid two-phase refrigerant that has passed through the upstream heat exchange element and collected in the folded header easily separates the gas and liquid. Liquid refrigerant accumulates in the lower part of the inside, and so-called liquid accumulation occurs.

  Therefore, when redistributed from the folded header to the plurality of flat tubes in the downstream heat exchange element, as shown in FIG. 10, the gas-liquid two-phase refrigerant is evenly distributed between the upper flat tube and the lower flat tube. There is a problem that the efficiency of the heat exchanger decreases.

Japanese Patent No. 4989979

  Accordingly, the present invention has been made to solve the above-described problems, and in a heat exchanger in which a plurality of heat exchange elements having a plurality of flat tubes arranged in the vertical direction are arranged in multiple rows via a folded header, the folded header The main challenge is to maintain the efficiency of the heat exchanger by preventing the occurrence of liquid pool in the interior and flowing the gas-liquid two-phase refrigerant evenly through each flat tube of the downstream heat exchange element. is there.

  That is, the heat exchanger according to the present invention includes a first heat exchange element having a plurality of first flat tubes arranged in the vertical direction, a second heat exchange element having a plurality of second flat tubes arranged in the vertical direction, One end of the first flat tube in the extending direction of the first heat exchange element and one end of the second flat tube in the extending direction of the second flat tube are connected, and the first A folding header that folds and introduces the refrigerant that has passed through the heat exchange element into the second heat exchange element, and the folding header has a plurality of refrigerant folding spaces partitioned in the vertical direction, and each of the refrigerants Each of the first flat tube and the second flat tube communicates with the folded space one by one.

  According to the heat exchanger configured as described above, the folded header has a plurality of refrigerant folded spaces partitioned in the vertical direction, and the first flat tube and the second heat exchange element are formed in the refrigerant folded space. Since each of the second flat tubes of the heat exchange element communicates with each other, the refrigerant that has passed through the plurality of first flat tubes of the first heat exchange element does not collect in the same space, but passes through the corresponding refrigerant return space. The liquid flows into the corresponding second flat tube, so that liquid pool is less likely to occur, and the gas-liquid two-phase refrigerant can flow evenly through the plurality of second flat tubes of the second heat exchange element. Efficiency can be maintained.

  The folded header includes a first plate member into which the plurality of first flat tubes and the plurality of second flat tubes are inserted, and a second plate that forms the refrigerant folded space integrally with the first plate member. It is desirable to provide with a member. In this case, it is possible to form a plurality of refrigerant return spaces in the return header while simplifying the structure.

  The second plate member includes a perforated member having a flat plate shape in which a plurality of through holes penetrating in the thickness direction is formed, and a closing member that closes one opening of the through hole in the perforated member, The refrigerant return space is preferably formed by a side surface of the first plate member, the through hole of the perforated member, and a side surface of the closing member. If it is this, a refrigerant | coolant return space can be formed reliably, simplifying a structure.

  It is desirable that a concave portion is formed on a surface of the second plate member facing the first plate member, and the refrigerant folding space is formed by a side surface of the first plate member and the concave portion. In this case, it is possible to efficiently form a plurality of refrigerant return spaces in the return header while minimizing the number of parts.

  It is desirable that at least a part of the end surface of the first flat tube and the end surface of the second flat tube inserted into the refrigerant return space are configured to face each other. If it is this, the refrigerant | coolant which came out of the flat tube of the 1st heat exchange element can be made easy to flow into the flat tube of the 2nd heat exchange element.

  According to the present invention configured as described above, in a heat exchanger in which a plurality of heat exchange elements having a plurality of flat tubes arranged in the vertical direction are arranged in multiple rows via a folded header, a liquid pool is generated in the folded header. In addition, the gas-liquid two-phase refrigerant can be caused to flow evenly through the flat tubes of the downstream heat exchange element, thereby maintaining the efficiency of the heat exchanger.

The schematic diagram which shows the structure of the heat exchanger in this embodiment. The top view and sectional drawing which show the structure of the folding | turning header in the same embodiment. The schematic diagram which shows the structure of the heat exchanger in deformation | transformation embodiment. The top view and sectional drawing which show the structure of the return header in deformation | transformation embodiment. The schematic diagram which shows the structure of the heat exchanger in deformation | transformation embodiment. The top view and sectional drawing which show the structure of the return header in deformation | transformation embodiment. Sectional drawing which shows the structure of the folding | turning header in deformation | transformation embodiment. Sectional drawing which shows the structure of the folding | turning header in deformation | transformation embodiment. The figure which shows the flow of the refrigerant | coolant in the return header in the conventional heat exchanger. The figure which shows the flow of the refrigerant | coolant in the conventional heat exchanger.

  Hereinafter, an embodiment of a heat exchanger according to the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the heat exchanger 100 according to the present embodiment is arranged in the vertical direction with the first heat exchange elements 1 having a plurality of first flat tubes 1A arranged in the vertical direction (vertical direction). A second heat exchange element 2 having a plurality of second flat tubes 2A, one end 1Z in the extending direction of the first flat tube 1A in the first heat exchange element 1 and a second flatness in the second heat exchange element 2 One end 2Z in the extending direction of the pipe 2A is connected, and a return header 3 is provided to return the refrigerant that has passed through the first heat exchange element 1 to the second heat exchange element 2 for introduction.

  As shown in FIG. 1, the first heat exchange element 1 has a plurality of first flat tubes 1A arranged in the vertical direction with corrugated fins 1B interposed therebetween. As shown in FIG. 2, the first flat tube 1 </ b> A is a multi-hole tube that has a substantially rectangular cross section and has a plurality of fluid flow holes 1 </ b> Aa that are arranged in the horizontal direction independently. In the present embodiment, the first flat tube 1A has seven fluid circulation holes 1Aa.

  As shown in FIG. 1, the second heat exchange element 2 has a plurality of second flat tubes 2A arranged in the vertical direction via corrugated fins 2B. As shown in FIG. 2, the second flat tube 2 </ b> A is a multi-hole tube that has a substantially rectangular cross section and has a plurality of fluid flow holes 2 </ b> Aa that are arranged in the horizontal direction independently. In the present embodiment, the second flat tube 2A has seven fluid circulation holes 2Aa.

  Here, the 1st heat exchange element 1 and the 2nd heat exchange element 2 in this embodiment are the extension direction (refrigerant flow direction) of the 1st flat tube 1A, and the extension direction (refrigerant flow direction) of the 2nd flat tube 2A. ) Are parallel to each other so that they are parallel to each other. Further, the number of the first flat tubes 1A and the number of the second flat tubes 2A are the same, and each first flat tube 1A and each second flat tube 2A face each other in the horizontal direction. It corresponds and is arranged at the same height position.

  The folded header 3 connects the first heat exchange element 1 and the second heat exchange element 2 arranged side by side on the same end side, and the one end 1Z and the second end of the first heat exchange element 1 are connected to each other. The heat exchange element 2 is provided to extend in the vertical direction so as to surround one end 2Z of the heat exchange element 2. The folded header 3 includes a plurality of first flat tubes 1A and a plurality of second flat tubes 2A between a first flat tube 1A and a single second flat tube 2B that are adjacent to each other in the horizontal direction. The refrigerant is turned back to flow.

  As shown in FIG. 2, the return header 3 is formed with a plurality of refrigerant return spaces 3 </ b> A partitioned in the vertical direction. Specifically, as shown in FIGS. 1 and 2, the folded header 3 includes a first plate member 31 to which the flat tubes 1A and 2A of the heat exchange elements 1 and 2 are inserted and fixed, and a first plate member. 31 and a second plate member 32 that forms a sealed refrigerant folding space 3A.

  In the present embodiment, the second plate member 32 has a perforated member 32A having a flat plate shape with a plurality of through holes 32Z penetrating in the thickness direction, and one opening of the through hole 32Z in the perforated member 32A. It comprises a closing member 32B that closes. Here, the through holes 32Z of the perforated member 32A are provided in the same number as the number of the first flat tubes 1A and the second flat tubes 2A, and the longitudinal direction of the through holes 32Z is formed along the horizontal direction. It is generally rectangular in view. In the through hole 32Z, openings of one first flat tube 1A and one second flat tube 2B adjacent to each other in the horizontal direction are located.

  A refrigerant return space 3A is formed by the side surface of the first plate member 31, the through hole 32Z of the perforated member 32A, and the side surface of the closing member 32B. 1 shows a state in which the first plate member 31, the perforated member 32A, and the closing member 32B are developed.

  In the folded header 3 configured as described above, one first flat tube 1A and one second flat tube 2A communicate with each refrigerant folded space 3A. Thereby, the refrigerant passes through the fluid circulation hole 1Aa formed in one first flat tube 1A, passes through one refrigerant folding space 3A, and then formed in one second flat tube 2A. It flows into the fluid circulation hole 2Aa. That is, the refrigerant that has passed through the plurality of first flat tubes 1A of the first heat exchange element 1 does not collect in the same space, and one first flat tube 1A and one second flat tube 2A One-to-one connection is made.

  Here, as a method of manufacturing the folded header 3, brazing is performed by interposing a brazing material between the first plate member 31 and the perforated member 32A and between the perforated member 32A and the closing member 32B. Conceivable. As an example, at least one of the first plate member 31 or the perforated member 32A and at least one of the perforated member 32A or the closing member 32B are made of a clad material in which one side or both sides are coated with a brazing material. Can be considered. When this clad material is used, the brazing process can be simplified.

  According to the heat exchanger 100 configured as described above, the folded header 3 has a plurality of refrigerant folding spaces 3A partitioned in the vertical direction, and the first flat tube 1A and the second flat tube are formed in the refrigerant folding space 3A. Since one pipe 2A communicates with each other, the refrigerant that has passed through the plurality of first flat tubes 1A of the first heat exchange element 1 does not collect in the same space, and corresponds through the corresponding refrigerant folding space 3A. Since it flows to the 2nd flat tube 2A of the 2nd heat exchange element 2, it becomes difficult to produce a liquid pool in the return header 3, and a gas-liquid two phase refrigerant is equally distributed to each 2nd flat tube 2A of the 2nd heat exchange element 2. The efficiency of the heat exchanger 100 can be maintained.

  The folded header 3 is integrated with the first plate member 31 into which the flat tubes 1A and 2A of the first heat exchange element 1 and the second heat exchange element 2 are inserted, and the refrigerant is folded with the first plate member 31. Since it has the 2nd board member 32 which forms space 3A, a plurality of refrigerant return space 3A in return header 3 can be formed, simplifying a structure.

  Further, the second plate member 32 has a plate-like perforated member 32A in which a plurality of through holes 32Z penetrating in the thickness direction is formed, and a blocking member 32B that closes one opening of the through hole 32Z of the perforated member 32A. The refrigerant folding space 3A is formed by the side surface of the first plate member 31, the through hole 32Z of the perforated member 32A, and the side surface of the closing member 32B. A plurality of refrigerant return spaces 3A can be reliably formed.

The present invention is not limited to the above embodiment.
For example, as shown in FIGS. 3 and 4, a recess 32 </ b> Y is formed on the surface of the second plate member 32 facing the first plate member 31, and the side surface of the first plate member 31 and the recess 32 </ b> Y of the second plate member 32 are formed. Thus, the refrigerant folding space 3A may be formed. In this case, the refrigerant return space 3A in the return header 3 can be efficiently formed while minimizing the number of parts. Here, the concave portion 32Y of the second plate member 32 may be formed by being pressed or may be formed by being cut.

  As shown in FIGS. 5 and 6, the second plate member 32 may have a wave shape in which semi-cylindrical shapes are continuously arranged. In this case, the wavy concave portion 32Y only needs to be configured to have substantially the same height as the flat tubes 1A and 2A of the first heat exchange element 1 and the second heat exchange element 2. And if it is such a structure, it is possible that the refrigerant | coolant return space 3A is formed by the side surface of the 1st board member 31, and the recessed part 32Y of the 2nd board member 32. FIG.

  Furthermore, as shown in FIGS. 7 and 8, at least a part of the end surfaces of the flat tubes 1A and 2A of the first heat exchange element 1 and the second heat exchange element 2 inserted into the refrigerant return space 3A, respectively, It may be configured to face each other. In this case, you may comprise so that the side surface of the 2nd board member 32 may contact | abut to the opening edge part of flat tube 1A, 2A. As an example of this form, as shown in FIG. 7, the open ends of the flat tubes 1A and 2A inserted into the refrigerant return space 3A are cut obliquely, or the refrigerant return space as shown in FIG. The opening ends of the flat tubes 1A and 2A inserted into 3A may be cut into a step shape. In this case, the refrigerant can smoothly flow in the refrigerant folding space 3A, and the flat tubes 1A and 2A of the first heat exchange element 1 and the second heat exchange element 2 and the folding header 3 are configured. Positioning in the longitudinal direction of the flat tubes 1A and 2A with the two plate members 32 is facilitated.

  In addition, although the above embodiment has been described with two heat exchange elements, the number of heat exchange elements is not limited to two, and there may be three or more. In this case, the effect similar to the said embodiment is acquired by making the header which connects each heat exchange element into the folding header 3 of this invention.

  In addition, it goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Heat exchanger 1 ... 1st heat exchange element 1A ... 1st flat tube 1Z ... One end part 2 of 1st heat exchange element ... 2nd heat exchange element 2A ... Second flat tube 2Z One end 3 of second heat exchange element Folding header 3A Refrigerant folding space

Claims (5)

A first heat exchange element having a plurality of first flat tubes arranged in a vertical direction;
A second heat exchange element having a plurality of second flat tubes arranged in the vertical direction;
Connecting one end portion in the extending direction of the first flat tube in the first heat exchange element and one end portion in the extending direction of the second flat tube in the second heat exchange element; A folded header for folding and introducing the refrigerant that has passed through the first heat exchange element into the second heat exchange element;
The folded header has a plurality of refrigerant folded spaces partitioned in the vertical direction,
A heat exchanger in which each of the first flat tube and the second flat tube communicates with each of the refrigerant return spaces. The folded header is
A first plate member into which the plurality of first flat tubes and the plurality of second flat tubes are inserted;
The heat exchanger according to claim 1, further comprising a second plate member integrated with the first plate member to form the refrigerant return space. The second plate member is
A perforated member having a flat plate shape in which a plurality of through holes penetrating in the thickness direction are formed;
A closing member that closes one opening of the through hole in the perforated member,
The heat exchanger according to claim 2, wherein the refrigerant return space is formed by a side surface of the first plate member, the through hole of the perforated member, and a side surface of the closing member. A concave portion is formed on a surface of the second plate member facing the first plate member,
The heat exchanger according to claim 2, wherein the refrigerant return space is formed by a side surface of the first plate member and the concave portion of the second plate member.   The heat according to any one of claims 1 to 4, wherein at least a part of an end surface of the first flat tube and an end surface of the second flat tube inserted into the refrigerant return space are opposed to each other. Exchanger.