JP3920098B2 - Heat exchanger - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat exchanger used in a vehicle air conditioner and the like, and in particular, a heat exchanger in which a desiccant container in which a desiccant is stored is inserted in a header pipe, for example, a receiver-integrated condenser, etc. The present invention relates to a heat exchanger structure suitable for the above.
[0002]
[Prior art]
In a heat exchanger, for example, a receiver-integrated condenser in which a receiver is integrated with a condenser, a cylindrical desiccant container in which a desiccant is stored is inserted in one of the header pipes. Has been. For example, as shown in FIG. 5, a desiccant container 105 containing a desiccant filled in a bag 103 having liquid permeability is contained in a header pipe 102 into which a plurality of tubes 101 are inserted. It is inserted. The desiccant container 105 is supported by support members 106 and 107. The lower part of the desiccant container 105 is inserted into the strainer unit 108. Lids 110 and 111 are provided at the end of the header pipe 102, and the strainer portion 108 is supported by the lid 111. In FIG. 5, reference numeral 112 denotes a fin disposed between the tubes 101.
[0003]
In the heat exchanger 100 as described above, the refrigerant flowing into the header pipe 102 from the tube 101 connected to the upper portion of the support member 107 passes through the opening 105 provided in the desiccant container 105. After the water is removed by the desiccant 104 after flowing into the subcool core, the subcool core temporarily stored in the liquid reservoir 114 formed at the lower portion of the support member 107 of the header pipe 102 and communicated with the liquid reservoir 114 It flows into each tube 101 to be formed.
[0004]
However, in the heat exchanger as described above, the desiccant container 105 in which the desiccant 104 is stored is a resin or metal (for example, pure water) in which a plurality of independent discontinuous openings 113 are formed on the peripheral surface. When the bag 103 filled with the desiccant 104 (hereinafter may be simply referred to as a desiccant or the like) is inserted into the container 105, it is composed of a cylindrical body made of aluminum or an aluminum alloy. Workability may be significantly reduced.
[0005]
For this reason, the desiccant to the desiccant container is formed by forming the desiccant container into a cylindrical body having an opening extending continuously in the longitudinal direction. The proposal which improved insertion workability | operativity etc. is made | formed (Japanese Patent Application No. 2001-378752).
[0006]
[Problems to be solved by the invention]
However, in the previous proposal, since the desiccant container is composed of a cylindrical body having an opening continuously extending in the longitudinal direction, the following problems may occur. That is, when inserting the desiccant container 119 in which the desiccant 118 filled in the bag body 117 is inserted into the header pipe 116 to which the tube 115 is communicated as shown in FIG. 115, the refrigerant flowing out of the tube 115 once collides with the outer peripheral surface of the desiccant container 119 and then passes between the outer peripheral surface and the inner peripheral surface of the header pipe 116. And flows into the desiccant container 119 from the opening 120. For this reason, the pressure loss of the fluid may increase. Also in the liquid reservoir, the liquid refrigerant flowing out from the opening 120 circulates between the outer peripheral surface and the inner peripheral surface and then flows into the tube 115 constituting the subcool core. Pressure loss may increase.
[0007]
The object of the present invention is to improve the workability of inserting the desiccant into the desiccant container, thereby improving the workability of the assembly as a whole apparatus, reducing the pressure loss of the fluid and reducing the heat exchange efficiency. The object is to provide a heat exchanger that can eliminate the fear.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, a heat exchanger according to the present invention communicates with a plurality of tubes extending in parallel between a pair of opposing header pipes, and a desiccant is accommodated in at least one of the header pipes. In the heat exchanger in which the desiccant container is inserted, the desiccant container is composed of a cylindrical body having an opening continuously extending in the longitudinal direction, and the opening is formed of a tube to the header pipe. It consists of what was arrange | positioned toward the insertion side.
[0009]
The opening is preferably disposed within a circumferential angle range of 180 ° on the insertion side of the heat exchange tube into the header pipe. If the opening is disposed outside the above range, the amount of fluid that collides with the outer peripheral surface of the desiccant container after flowing out of the tube may increase, and the pressure loss may increase. Further, in the liquid reservoir, the length of the flow path from the opening to the tube on the subcool core side becomes long, and there is a possibility that the pressure loss of the fluid increases.
[0010]
The cylindrical body constituting the desiccant container can have a substantially C-shaped cross section. For example, a single flat plate is roll-formed so as to form an opening extending continuously in the longitudinal direction, or a straight tube such as a track shape or polygonal shape having a circular or elliptical cross section, a part of which is flat. If the pipe is provided with a notch extending continuously in the longitudinal direction, the desiccant container as described above can be easily configured.
[0011]
The opening size of the opening of the desiccant container is preferably in the range of 10 ° or more and 90 ° or less of the circumferential angle around the center of the cross section of the cylindrical body. If the opening size is less than 10 ° and the opening size is small, the resistance to liquid passage into the desiccant container may be significantly increased. On the other hand, if the opening size exceeds 90 ° and becomes too large, the holding strength of the desiccant and the like by the desiccant container may be reduced.
[0012]
Moreover, the cylindrical body which comprises the said desiccant container can be comprised from metals, such as resin or pure aluminum, an aluminum alloy.
[0013]
The heat exchanger according to the present invention can be widely applied to a heat exchanger of a type in which a desiccant container in which a desiccant is contained in a header pipe is inserted. In particular, a liquid reservoir is provided at the lower part of the header pipe. It is suitable for a subcool type capacitor formed and having a cooling core and a subcooling core.
[0014]
In the heat exchanger as described above, the desiccant container is composed of a cylindrical body having an opening continuously extending in the longitudinal direction. Such a cylindrical body, for example, by forming a gap between the ends of one flat plate with a gap, and by providing a notch extending continuously in the longitudinal direction in a commercially available straight tubular pipe, Or it can shape | mold easily by one process by injection molding, extrusion molding, etc. Further, when the opening as described above is provided, when inserting the desiccant or the like, the opening can be expanded on both sides and the cylindrical body can be elastically deformed, so that the workability of inserting the desiccant or the like can be improved. . Moreover, after insertion of a desiccant etc., a cylindrical body elastically restores and can hold | maintain a desiccant etc. reliably.
[0015]
In the heat exchanger as described above, the fluid that has flowed out of the tube flows directly into the desiccant container from the opening. That is, the fluid flowing out of the tube does not collide with the outer peripheral surface of the desiccant container, and the shortest flow path without forming a detour that goes around between the outer peripheral surface and the inner peripheral surface of the header pipe. Thus, the pressure loss can be reduced. Moreover, since the fluid stored in the liquid reservoir is directly introduced into the tube group communicated with the subcool core through the shortest flow path, pressure loss can be reduced.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of a heat exchanger according to the present invention will be described with reference to the drawings.
FIG. 1 shows a heat exchanger according to an embodiment of the present invention. In this embodiment, the case where the present invention is applied mainly to a receiver-integrated condenser, in particular, a subcool type condenser will be described.
[0017]
In the figure, reference numeral 1 denotes a subcool type capacitor. The subcool type capacitor 1 has a second header pipe 2 and a first header pipe 3 that extend in parallel in the vertical direction, and a plurality of heat exchange tubes 4 that extend in parallel and communicate between the header pipes 2 and 3. is doing. Corrugated fins 5 are provided between the heat exchange tubes 4 and on the outermost layers thereof. A refrigerant inlet pipe 6 is provided at the upper part of the second header 2, and a refrigerant outlet pipe 7 is provided at the lower part.
[0018]
A partition plate 8 is provided in the second header pipe 2, and the partition plate 8 partitions the second header pipe 2 into an upper space and a lower space. With this partition plate 8, the arrangement region of the plurality of heat exchange tubes 4 further supercools the refrigerant condensed core 9 that condenses the refrigerant introduced into the condenser 1 and the refrigerant condensed in the refrigerant condensed core 9. The subcool core 10 is partitioned. That is, by providing the partition plate 8 in the integrally formed second header pipe 2, the entire core of the capacitor 1 is partitioned into the refrigerant condensing core 9 and the subcooling core 10. In this embodiment, the refrigerant passage formed by the plurality of heat exchange tubes 4 extending in parallel in the refrigerant condensing core 9 is formed as a one-pass passage. Therefore, the refrigerant introduced into the second header pipe 2 from the inlet pipe 6 passes through each heat exchange tube 4 of the refrigerant condensation core 9 in the form of a one-pass passage and flows into the first header pipe 3. After flowing downward in the first header pipe 3, it is directly introduced to the inlet side to the subcool core 10, passes through each heat exchange tube 4 of the subcool core 10, and flows out from the outlet pipe 7. However, it is also possible to configure the refrigerant condensing core 9 part in a passage having two or more paths.
[0019]
In this embodiment, the occupancy ratio of the subcool core portion with respect to the entire subcool type capacitor core is about 10%. According to the experiment by the present applicant, the occupation ratio is preferably about 5 to 12%, and by setting within this range, the capacitor installation space in the vehicle engine room is limited, that is, within the limited capacitor size. The optimum degree of supercooling can be realized while suppressing the increase in the high-pressure side pressure resulting from the subcooling and the accompanying decrease in vehicle fuel consumption.
[0020]
In the present embodiment, the header portion corresponding to the inlet side to the subcool core 10 in the first header pipe 3 is formed in the liquid reservoir 11. The refrigerant from the refrigerant condensing core 9, that is, the refrigerant from the upper side of the first header 3, after moisture is removed by the desiccant 12, is stored in the liquid reservoir 11, from which each heat of the subcool core 10 is stored. It will flow into the exchange tube 4.
[0021]
A desiccant unit 13 is inserted in the first header pipe 3. The desiccant unit 13 has a liquid-permeable bag body 17 filled with the desiccant 12 and a desiccant container 18 in which these are stored.
[0022]
In this embodiment, the desiccant container 18 is composed of a cylindrical body having an opening 19 that continuously extends in the longitudinal direction, as shown in FIG. 4, and has a substantially C-shaped cross section. . Moreover, in this embodiment, the opening part 19 of the desiccant container 18 is arrange | positioned so that it may oppose substantially on the insertion side of the tube 4, as shown in FIG. In addition, the direction of the opening part 19 is not limited to the aspect shown in FIG. 3, and should just be in the circumference angle range of 180 degrees of the insertion side of the heat exchange tube 4. As shown in FIG. Within this range, the amount of refrigerant that flows out of the tube 4 and collides with the outer peripheral surface of the desiccant container 18 becomes very small, so that the pressure loss is reduced and the object of the present invention can be achieved.
[0023]
The opening dimension Cr of the opening 19 is set in the range of 10 ° or more and 90 ° or less of the circumferential angle around the center of the cross section of the header pipe 3. If it is less than 10 °, the pressure loss of the refrigerant passing through the opening 19 may increase. On the other hand, if it exceeds 90 °, the retention of the desiccant and the like by the desiccant container 18 may be reduced.
[0024]
The desiccant container 18 can be made of resin or metal. A desiccant container 18 having an opening 19 continuously extending in the longitudinal direction is formed by, for example, roll-forming a gap between both ends of a flat plate made of resin or the like, and a commercially available straight pipe. By providing a notch extending continuously in the longitudinal direction, or by injection molding, extrusion molding or the like, it can be easily molded in one step.
[0025]
The desiccant container 18 is supported by annular support members 15 and 16. The lower part of the desiccant container 18 is inserted into a strainer 14 that captures foreign matters mixed in the refrigerant. The strainer 14 is supported by a lid body 20 screwed into one end of the header pipe 3. A lid 21 is brazed to the other end of the header pipe 3.
[0026]
In the present embodiment, the desiccant container 18 is composed of a cylindrical body having an opening 19 that continuously extends in the longitudinal direction. Therefore, when a desiccant or the like is inserted into the desiccant container 18. If the opening 19 is expanded on both sides and the desiccant container 18 is elastically deformed, the desiccant and the like can be easily accommodated therein, and the insertion workability of the desiccant and the like can be improved. Further, after the insertion of the desiccant and the like is completed, the desiccant container 18 is elastically restored and the desiccant and the like are securely held.
[0027]
Moreover, in this embodiment, since the opening part 19 is arrange | positioned toward the insertion side of the tube 4 to the header pipe 3, the refrigerant | coolant which flowed out from the tube 4 goes directly into the desiccant container 18 from the opening part 19. FIG. Inflow. That is, as shown by the arrow in FIG. 3, the refrigerant that has flowed out of the tube 4 does not collide with the outer peripheral surface of the desiccant container 18, and between the outer peripheral surface and the inner peripheral surface of the header pipe 3. The shortest flow path is formed without forming a detour route that goes around, and flows into the desiccant container 18 from the opening 19. Therefore, the pressure loss can be greatly reduced. Also in the liquid reservoir 11, the liquid refrigerant that has flowed out and stored from the opening 19 flows directly into the tube group that constitutes the subcool core 10 through the shortest flow path, so that pressure loss can be reduced.
[0028]
【The invention's effect】
As described above, when the heat exchanger of the present invention is used, the desiccant container can be easily manufactured at a low cost and the workability of inserting the desiccant into the desiccant container is improved. As a result, the assembly workability of the entire apparatus can be improved and the cost can be reduced.
[0029]
In addition, since the pressure loss of the fluid passing through the opening of the desiccant container, and hence the pressure loss of the fluid in the heat exchanger, can be reduced, the heat exchange performance can be improved.
[Brief description of the drawings]
FIG. 1 is a front view of a heat exchanger according to an embodiment of the present invention.
2 is an enlarged longitudinal sectional view of a first header pipe of the heat exchanger of FIG. 1. FIG.
FIG. 3 is an enlarged cross-sectional view of a first header pipe of the heat exchanger of FIG.
4 is a perspective view of a desiccant container of the heat exchanger of FIG. 1. FIG.
FIG. 5 is a longitudinal sectional view of a header pipe into which a desiccant container of a conventional heat exchanger is inserted.
FIG. 6 is an enlarged cross-sectional view of a header pipe of a heat exchanger according to the applicant's previous proposal.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Subcool type capacitor | condenser 2 2nd header pipe 3 1st header pipe 4 Heat exchange tube 5 Fin 6 Inlet pipe 7 Outlet pipe 8 Partition plate 9 Refrigerant condensation core 10 Subcool core 11 Liquid reservoir part 12 Desiccant 13 Desiccant unit 14 Strainers 15 and 16 Support member 17 Bag body 18 Desiccant container 19 Openings 20 and 21 Lid

Claims (3)

In the heat exchanger in which the desiccant container in which the desiccant is accommodated in at least one header pipe is inserted into the plurality of tubes extending in parallel between the pair of opposing header pipes, the desiccant accommodating A heat exchanger characterized in that the body is composed of a cylindrical body having an opening continuously extending in the longitudinal direction, and the opening is arranged toward the tube insertion side of the header pipe. The heat exchanger according to claim 1, wherein the opening is disposed within a circumferential angle range of 180 ° on the insertion side of the heat exchange tube into the header pipe. The heat exchanger according to claim 1 or 2, wherein the heat exchanger includes a subcool type condenser having a refrigerant condensing core for condensing the refrigerant and a subcooling core for further condensing the refrigerant condensed in the refrigerant condensing core.

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