JP2012145269A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger improving productivity while preventing deterioration in heat exchange efficiency, preventing an increase in the number of parts and increase in brazed portions, as well as preventing distortion due to heat during production.SOLUTION: This heat exchanger includes two heat exchanger constituents 2 that are equipped with: upper and lower header pipes 3U, 3L disposed along the lateral direction in parallel to each other; a plurality of tubes 4 disposed along the vertical direction between the header pipes 3U, 3L and communicating with the header pipes 3U, 3L; and fins 5 disposed between adjacent tubes 4, 4. The heat exchanger includes two heat exchanger constituents 2, 2 having the header pipes 3U, 3L whose lengths are set to be substantially the same as the length of the tubes 4. The two heat exchanger constituents 2, 2 are disposed adjacent to each other in the lateral direction. Ends 3b, 3b of the upper header pipes 3U, 3U of the adjacent heat exchanger constituents 2, 2 are connected by being fitted to each other. The ends 3b, 3b of the lower header pipes 3L, 3L are connected by being fitted to each other.

Description

  The present invention relates to a heat exchanger used as an outdoor heat exchanger of a vehicle air-conditioning heat pump system having functions of both a condenser and an evaporator, for example.

  Conventionally, as the above-described heat exchanger, for example, a pair of header pipes arranged in parallel to each other at intervals, and a pair of header pipes arranged in parallel to each other with a slight gap between these header pipes. Some include a plurality of tubes communicating with both sides and fins disposed between adjacent tubes. This heat exchanger is a so-called refrigerant cross-flow type heat exchanger that is installed with a pair of header pipes along the vertical direction and a plurality of tubes along the horizontal direction. The length dimension (lateral dimension) of the tube is larger than the length dimension (vertical dimension) (see, for example, Patent Document 1).

  In such a refrigerant cross-flow type heat exchanger, when the refrigerant evaporates, condensed water is generated on each surface of the plurality of tubes along the left-right direction, and the water is retained on the tubes. There is a possibility that the heat exchange efficiency is lowered by the growth of the layer.

  As a heat exchanger that suppresses the occurrence of the frosting phenomenon, that is, can promote the elimination of condensed water generated on the surfaces of the plurality of tubes, the so-called longitudinal flow of the refrigerant is arranged so that the plurality of tubes are arranged vertically. A type of heat exchanger has been developed. In this refrigerant longitudinal flow type heat exchanger, the length (horizontal dimension) of the header pipe arranged along the left-right direction is larger and the tube along the vertical direction is larger than the refrigerant transverse flow type heat exchanger. The length dimension (vertical dimension) is reduced, and the number of tubes is greatly increased along with this (for example, see Patent Document 2).

Utility Model Registration No. 2558472 Japanese Patent No. 4052706

  However, in the above-described refrigerant longitudinal flow type heat exchanger, high dimensional accuracy is required for each of the plurality of tubes and fins for the purpose of greatly increasing the number of tubes, and in addition, a large number of tubes in the header pipe. When forming the connection holes at a predetermined pitch, severe processing accuracy is required, and as a result, there is a problem that productivity cannot be said to be good.

  In this case, a method of connecting the tube to the header pipe via another part that is mounted by brazing is also conceivable, but this increases the number of parts and the brazed part, and matches the length of the header pipe. Therefore, there is a problem that heat distortion occurs in the entire heat exchanger during brazing in the furnace as much as the length of other parts becomes longer. It was an issue.

  The present invention has been made by paying attention to the above-described conventional problems, and it is possible to improve productivity while preventing a decrease in heat exchange efficiency, and to increase the number of parts and brazing parts. The object of the present invention is to provide a heat exchanger that can suppress the increase to a small extent and that is hardly distorted by heat during production.

  In order to achieve the above-described object, a heat exchanger according to claim 1 of the present invention includes upper and lower header pipes arranged in the left-right direction in a state of being parallel to each other, and between these header pipes. A plurality of heat exchanger components including a plurality of tubes arranged along the vertical direction and communicating with both of the upper and lower header pipes, and fins arranged between adjacent tubes, the plurality of heat exchangers The components are arranged side by side in the left-right direction, and the ends of the upper header pipes in the heat exchanger components adjacent to each other are connected by fitting, and the ends of the lower header pipe are connected to each other. It is characterized by the configuration connected by fitting, and the configuration of this heat exchanger is a means for solving the above-described conventional problems.

  In the heat exchanger according to the present invention, a large number of tubes are respectively arranged along the vertical direction between the upper and lower header pipes. Therefore, similar to the conventional refrigerant longitudinal flow type heat exchanger, The elimination of the condensed water generated on each surface is promoted, and the decrease in heat exchange efficiency is suppressed to a small extent.

  At this time, since the heat exchanger according to the present invention is formed by arranging a plurality of heat exchanger components side by side in the left-right direction, the upper and lower header pipes, a number of tubes, and fins have a plurality of heat exchanger configurations. Since it is divided into the number of bodies, the number of tubes of each heat exchanger component is naturally smaller than the total number.

  In other words, when manufacturing the heat exchanger structure, the length and dimensions of the tubes and fins are less than the total number, and the length dimensions are easy to manage, and the upper and lower header pipes are formed at a predetermined pitch. It is easy to make a tube connection hole. Then, by arranging heat exchanger components that are easy to manufacture in the left-right direction and connecting the ends of the upper and lower header pipes in adjacent heat exchanger components by fitting, heat Since the production of the exchanger is completed, productivity is improved.

  In addition, when manufacturing the heat exchanger, no separate parts that are attached to the header pipe by brazing are used, so there is no increase in the number of parts and an increase in brazed parts, and the occurrence of heat distortion is also possible. It will be avoided.

  Moreover, the heat exchanger which concerns on Claim 2 of this invention is set as the structure by which the length dimension of the said header pipe in the said heat exchanger structure is set to the same or less than the length dimension of the said tube.

  In the heat exchanger having such a configuration, the number of tubes included in each of the heat exchanger constituents increases as the length of each of the upper and lower header pipes in the heat exchanger constituent becomes shorter than the length of the tubes. Will naturally be less.

  In other words, when manufacturing the heat exchanger structure, if the length of each of the upper and lower header pipes is made shorter than the length of the tube, the length can be managed by the amount of tubes and fins. In addition to being easier to perform, the operation of drilling tube connection holes formed at a predetermined pitch in the upper and lower header pipes is further facilitated.

  Furthermore, in the heat exchanger according to claim 3 of the present invention, each end of the upper and lower header pipes in any one of the heat exchanger components adjacent to each other is an expanded end. The respective end portions of the upper and lower header pipes in the other heat exchanger structure of the heat exchanger structures adjacent to each other are respectively formed with respect to the expanded end portions of these header pipes. It is set as the structure connected by fitting.

  In the heat exchanger having such a configuration, when the ends of the upper and lower header pipes in the heat exchanger structure adjacent to each other are connected by fitting, the both ends of the header pipe are brazed to each other. Therefore, it is not necessary to intervene a connecting member which is a separate part. Therefore, an increase in the number of parts and work processes can be suppressed, and productivity can be further improved as much as the work processes can be reduced.

  Furthermore, in the heat exchanger according to claim 4 of the present invention, the inner fitting surface of the expanded pipe end portion in the header pipe on either one side and the other side fitted and connected to the expanded pipe end portion. The outer fitting surfaces at the ends of the header pipes are joined together by brazing.

  With such a configuration, when the header pipe and the tube are connected by brazing in the furnace, the connection between the end portions of the header pipe is also performed at the same time. In addition, in the header pipe on one side, The inner fitting surface of the expanded pipe end portion and the outer fitting surface of the end portion of the header pipe on the other side are closely joined, and the sealing performance is also improved.

  Since the heat exchanger according to claim 1 of the present invention has the above-described configuration, it is possible to improve productivity while preventing a decrease in heat exchange efficiency, and to increase the number of parts and brazing. In addition, the increase in the portion can be suppressed to a small extent, and in addition, an excellent effect is achieved in that a production with almost no thermal distortion is possible.

  Moreover, since the heat exchanger according to claim 2 of the present invention has the above-described configuration, it is possible to realize further improvement in productivity, and the heat exchanger according to claim 3 of the present invention includes: Since it has the above-described configuration, it is possible to further improve the productivity without causing an increase in the number of parts and work processes, and the heat exchanger according to claim 4 of the present invention has the above-described configuration. Therefore, in addition to further improving productivity, it is possible to realize improvement in sealing performance.

It is front explanatory drawing of the heat exchanger which concerns on one Embodiment of this invention. It is an expansion perspective explanatory view in the connection part of the heat exchanger constituents of the heat exchanger shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a heat exchanger according to an embodiment of the present invention. As shown in FIG. 1, the heat exchanger 1 is a refrigerant vertical flow type heat exchanger, and includes two pieces. The heat exchanger components 2 and 2 are arranged side by side in the left-right direction.

  The heat exchanger structure 2 includes upper and lower header pipes 3U and 3L arranged in the left-right direction in a state of being parallel to each other, and a slight amount along the vertical direction between the header pipes 3U and 3L. A plurality of tubes 4 arranged in parallel with each other and communicating with both the upper and lower header pipes 3U, 3L, and fins 5 arranged between the adjacent tubes 4, 4; The tubes 4 are connected to the tube connection holes 3a formed at equal pitches in the header pipes 3U and 3L by brazing.

  In this embodiment, the length dimensions of the header pipes 3U, 3L of the heat exchanger structure 2 are set to be substantially equal to the length dimensions of the tube 4, and two heat exchanger structures aligned in the left-right direction. 2 and 2, the end portions 3b and 3b of the upper header pipes 3U and 3U adjacent to each other are connected by fitting, and the end portions 3b and 3b of the lower header pipes 3L and 3L adjacent to each other are connected to each other. It is connected by connecting by mating.

  In this case, as shown in FIG. 2, the end portions 3b and 3b of the upper and lower header pipes 3U and 3L in the left heat exchanger structure 2 of the heat exchanger structures 2 and 2 arranged in the left-right direction are The expanded pipe end portions 3B and 3B are formed respectively. The expanded pipe end portions 3B and 3B of the left header pipes 3U and 3L and the upper and lower header pipes 3U and 3L in the right heat exchanger structure 2 are formed. The end portions 3b and 3b are fitted to each other.

At this time, the inner fitting surfaces 3c and 3c of the expanded pipe end portions 3B and 3B in the left header pipes 3U and 3L and the end portions 3b of the right header pipes 3U and 3L fitted to the expanded pipe end portions 3B and 3B, respectively. , 3b outer fitting surfaces 3d, 3d are joined by brazing.
In addition, the code | symbol 6 in a figure is a cover which hold | suppresses the fin 5 located in the right-and-left end part of the heat exchanger structure 2. FIG.

  In the heat exchanger 1 having such a configuration, a large number of tubes 4 are respectively arranged along the vertical direction between the upper and lower header pipes 3U and 3L, and therefore, similar to a conventional refrigerant vertical flow type heat exchanger. In addition, the removal of the condensed water generated on each surface of the large number of tubes 4 is promoted, and the decrease in the heat exchange efficiency is suppressed to a small extent.

  Further, in this heat exchanger 1, since the two heat exchanger components 2, 2 are arranged side by side in the left-right direction, the numerous tubes 4 and fins 5 together with the upper and lower header pipes 3U, 3L. Each is divided into two sets, and the number of tubes 4 included in each heat exchanger component 2 is halved compared to the total number.

  That is, in manufacturing the heat exchanger structure 2, the length of the tubes 4 and fins 5 is half that of the total number, and in addition to easy management of the length, the upper and lower header pipes Drilling work of the tube connection holes 3a formed at a predetermined pitch in 3U and 3L becomes easy.

  The heat exchanger components 2 and 2 that are easy to manufacture are arranged side by side in the left-right direction, and the adjacent end portions 3b and 3b of the upper and lower header pipes 3U and 3L are connected by fitting. In this case, since the manufacture of the heat exchanger 1 is completed, the productivity is improved.

  In addition, when the heat exchanger 1 is manufactured, no separate parts that are attached to the header pipes 3U and 3L by brazing are used, so that the number of parts and the brazed portion are not increased, and the heat exchanger 1 is heated. Generation of distortion is also avoided.

  Further, in the heat exchanger 1 according to this embodiment, the end portions 3b and 3b of the upper and lower header pipes 3U and 3L in the heat exchanger structure 2 on the left side of the drawing are formed as the expanded pipe end portions 3B and 3B, respectively. Tube expansion end portions 3B, 3B and upper and lower header pipes 3U, 3L in the right heat exchanger structure 2 shown in FIG. It is not necessary to intervene a connecting member that is a separate part that is brazed to both the pipes 3U and 3L. Therefore, an increase in the number of parts and work processes can be suppressed, and the work process can be suppressed to a small extent. Productivity will be further improved.

  Further, in the heat exchanger 1 according to this embodiment, in the pipe fitting end portions 3B, 3B of the pipe expansion end portions 3B, 3B and the header pipes 3U, 3L on the right side of the drawing fitted to the pipe expansion end portions 3B, 3B. Since the outer fitting surfaces 3d and 3d of the ends 3b and 3b are joined to each other by brazing, the header pipes 3U and 3L and the tube 4 are connected by brazing in a furnace not shown. At the same time, the end portions 3B and 3b of the header pipes 3U and 3L are also connected by brazing, and in addition, the inner fitting surface 3c of the expanded pipe end portion 3B and the expanded pipe end portion 3B are fitted. As a result, the outer fitting surface 3d of the end portion 3b to be joined is closely joined, and the sealing performance is also improved.

  In the above-described embodiment, the case where the heat exchanger 1 is configured by arranging the two heat exchanger components 2 and 2 side by side in the left-right direction has been described. However, the present invention is not limited to this, and heat exchange is performed. It is good also as a structure which arranges three or more vessel structure bodies 2.

  Moreover, although the length dimension of header pipe 3U, 3L of the heat exchanger structure 2 showed the case where it was substantially equivalent to the length dimension of the tube 4 in above-described embodiment, it is not limited to this. The length dimension of the header pipes 3U and 3L may be set smaller than the length dimension of the tube 4.

  Further, in the above-described embodiment, the inner fitting surfaces 3c, 3c of the pipe expansion end portions 3B, 3B and the outer fitting surfaces 3d, 3d of the end portions 3b, 3b fitted to the pipe expansion end portions 3B, 3B. In this case, at least one of the inner fitting surface 3c of the expanded pipe end 3B and the outer fitted surface 3d of the end 3b fitted with the expanded pipe end 3B is used. It is desirable to form a brazing material.

  Furthermore, the configuration of the heat exchanger according to the present invention is not limited to the configuration of the above-described embodiment.

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Heat exchanger structure 3B Expanded pipe end (end of header pipe)
3L Lower header pipe 3U Upper header pipe 3b Header pipe end 3c Expanded end inner fitting surface 3d Header pipe end outer fitting surface 4 Tube 5 Fin

Claims (4)

Upper and lower header pipes arranged along the left-right direction in a state of being parallel to each other, and a plurality of tubes arranged along the up-down direction between these header pipes and communicating with both the upper and lower header pipes A plurality of heat exchanger components having fins arranged between adjacent tubes,
The plurality of heat exchanger structures are arranged side by side in the left-right direction, and the ends of the upper header pipes in the heat exchanger structures adjacent to each other are connected by fitting, and the lower header pipe These heat exchangers are connected to each other by fitting.   The heat exchanger according to claim 1, wherein a length dimension of the header pipe in the heat exchanger structure is set to be equal to or less than or equal to a length dimension of the tube.   Each end of the upper and lower header pipes in any one of the heat exchanger structures adjacent to each other is formed as a pipe expansion end, and each pipe expansion end of these header pipes On the other hand, each end part of the upper and lower header pipes in either one of the heat exchanger structures adjacent to each other is fitted and connected. Heat exchanger.   The inner fitting surface of the expanded pipe end portion of the header pipe on either side and the outer fitted surface of the end portion of the header pipe on the other side fitted and connected to the expanded pipe end portion are brazed together. The heat exchanger according to claim 3 to be joined.

Images