JP2005083719A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a header pipe section structure in a heat exchanger for performing the offset arrangement of a header pipe and preventing a decrease in the pressure resistance performance of the header pipe. <P>SOLUTION: In the parallel flow type heat exchanger, at least one header pipe is arranged while a position at the center of the cross section is offset to one side in the thickness direction of the heat exchanger to the position of the center in the thickness direction of the heat exchanger, an outer surface at a part in which the heat exchange tube of the header pipe is connected is formed on a flat surface A, and the inner cross section shape is formed circularly. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a so-called parallel flow type heat exchanger in which heat exchange tubes are arranged in parallel between header pipes, and in particular, a header pipe portion of a heat exchanger suitable as a condenser for a vehicle air conditioner, particularly a subcool type condenser. Related to the structure.

  A so-called parallel flow type heat exchanger in which a heat exchange tube is provided between two header pipes is well known. In this type of heat exchanger, a relatively large volume may be required for at least one of the header pipes, and the crossing is larger than the width of the heat exchange tubes extending in parallel (the width in the thickness direction of the heat exchanger). A face may be required. For example, in a capacitor for a vehicle air conditioner, particularly a subcool type capacitor, one header pipe may require a larger cross section than the other header pipe, and may require a liquid storage function.

  Such a subcool type capacitor is configured, for example, as shown in FIG. 1 (the basic configuration shown in FIG. 1 is a basic configuration common to the present invention). A heat exchanger 1 (subcool type condenser) shown in FIG. 1 includes two header pipes 2 and 3, and a plurality of flat type heat exchange tubes 4 that are arranged between the header pipes 2 and 3 and extend in parallel. The corrugated fins 5 are provided between the heat exchange tubes 4 and in the outermost layer. One header pipe 2 is provided with an inlet portion 6 and an outlet portion 7 of a refrigerant, and a partition plate 8 is provided therein. The other header pipe 3 has a water removal function as well as a liquid storage function. In the header pipe 3, for example, a built-in object 11 having a desiccant unit 9 holding a desiccant bag for removing moisture on the upper side and a strainer 10 for removing foreign substances on the lower side is accommodated. The built-in object 11 is detachably held in the header pipe 3 by a holding plate 12 having a communication part at the center. Of the entire core portion 13 of the heat exchanger 1, a portion positioned above the partition plate 8 is configured as a refrigerant condensing core portion 14 that condenses the refrigerant, and a portion positioned below the partition plate 8 is refrigerant condensed. The subcooled core portion 15 is configured to further supercool the refrigerant condensed in the core portion 14. In the heat exchanger 1 provided with the respective core portions 14 and 15 thus partitioned, first, the refrigerant introduced from the inlet portion 6 to the portion above the partition plate 8 of the header pipe 2 is the refrigerant condensation core portion. 14, the water is removed from the refrigerant flowing into the header pipe 3 and the foreign matter is removed, and the liquefied refrigerant is temporarily stored in the lower part of the header pipe 3 (particularly, the liquid reservoir portion). Is temporarily stored in the lower portion 3a in the header pipe 3 functioning as a portion), and then flows into the subcool core portion 15 and is supercooled, and then the portion 2a on the lower side of the partition plate 8 of the header pipe 2 and the outlet portion 7 is discharged. In such a subcool type condenser, the function of the receiver dryer in the refrigeration system can be integrated with the condenser without providing a separate part, and the dryer (the built-in component 11 having the desiccant) can be replaced. A compact and efficient structure built in one header pipe 3 can be achieved.

  Since such a heat exchanger 1 can be configured compactly, it is optimal for a vehicle air conditioner or the like where installation space is limited. However, in such a heat exchanger 1, since the cross-sectional area of at least one header pipe, that is, the header pipe 3 that houses the built-in material 11 in the above-described form, must be increased, the following problem occurs. Sometimes. For example, when the header pipe 21 having a circular cross section as shown in FIG. 2 is adopted for the header pipe 3, the refrigerant condensing core portion 14 is formed with respect to the width of the heat exchange tube 4 in the thickness direction of the heat exchanger 1. The header pipe 21 serving as the outlet portion and the inlet portion of the subcool core portion 15 protrudes greatly in the front-rear direction. Therefore, for example, as shown in FIG. 3, when the on-board layout is such that the condenser (heat exchanger 1) and the radiator 30 are arranged in the front and rear, the heat radiating part of the heat exchange tube 4 and the radiator 30 are greatly separated. As a result, the thickness of the capacitor plus radiator 30 in the arrangement state is increased, which is disadvantageous in terms of on-vehicle layout, and the air flow between the capacitor and the radiator 30 is reduced due to air leakage between the capacitor and the radiator 30, thereby deteriorating the performance of the capacitor. May be incurred.

  In order to solve such a problem, for example, as shown in FIG. 4, the header pipe 41 having a large cross section is arranged at the center position in the thickness direction of the heat exchanger, that is, the heat exchange tube 4. It can be considered that the heat exchanger is arranged so as to be offset (eccentric) on one side in the thickness direction of the heat exchanger (on the side opposite to the radiator in the form of FIG. 3) with respect to the center position in the thickness direction of the heat exchanger. However, in this case, the size 42 of the tube insertion portion into the header pipe 41 is increased, and the diameter of the built-in object 43 must be reduced in order to avoid interference between the tube end and the built-in object 43. Occurs.

  As a measure for preventing this problem, for example, a header pipe 51 having a cross-sectional shape partially having a flat surface A as shown in FIG. 5 is used, and as shown in FIG. There is known a structure in which the insertion hole of the heat exchange tube 4 is processed and the position of the center of the cross section of the header pipe 51 is offset to one side in the thickness direction of the heat exchanger (Patent Document 1). With this configuration, the gap between the heat exchange tube 4 and the radiator can be kept small while ensuring a predetermined diameter of the inner casing 11 without increasing the tube insertion dimension 42 as shown in FIG. Is possible.

However, in the structure as described above, since the internal cross-sectional shape of the header pipe 51 is not circular, when the internal pressure P is increased as shown in FIG. There is a possibility that deformation occurs in the portion where the flat surface adjacent thereto is formed, and the pressure resistance performance of the header pipe 51 is lowered. In addition, as a means for preventing a drop in the pressure resistance performance of the header pipe, Patent Documents 2 and 3 show a structure in which a reinforcing member is added inside the header pipe. In this structure, the manufacturing is performed by increasing the number of parts. Increases costs. Further, in Patent Document 4, an attempt is made to prevent the strength reduction while restricting the cross-sectional shape of the header pipe to a predetermined shape, but the strength reduction cannot be sufficiently suppressed when compared with the circular cross-sectional shape. .
JP 2003-185296 A JP 2000-39288 A JP 2003-172592 A JP 2002-48488 A

  Accordingly, an object of the present invention is to increase the tube insertion dimension in the header pipe and accommodate it in the header pipe in a parallel flow type heat exchanger that requires a large cross-sectional area of at least one header pipe. Heat exchanger capable of offset arrangement in the thickness direction of the heat exchanger of the header pipe without reducing the diameter of the built-in components and preventing the pressure resistance performance of the header pipe from being lowered It is to provide a header pipe part structure.

  In order to solve the above-described problems, a heat exchanger according to the present invention is a parallel flow type heat exchanger in which a plurality of heat exchange tubes extending in parallel between two header pipes are disposed, and at least one header pipe is provided. Of the section of the header pipe to which the heat exchange tube is connected, with the position of the center of the cross section being offset to one side of the thickness direction of the heat exchanger with respect to the position of the center of the heat exchanger in the thickness direction. The outer surface is formed on a flat surface A, and the inner cross-sectional shape of the header pipe is formed in a circular shape.

  In this heat exchanger, the outer surface of the header pipe adjacent to the flat surface A in the circumferential direction of the header pipe may be formed on the flat surface B substantially. In this case, the outer surface of the header pipe other than the flat surface A and the flat surface B can be formed in a circular cross section. Moreover, it can also be set as the structure by which the recessed part which engages the jig | tool for fixing a header pipe when processing the edge part insertion hole of a heat exchange tube in the said header pipe is formed in the flat surface B.

  Such a header pipe according to the present invention can be formed by extrusion as a header pipe before the end insertion hole processing of the heat exchange tube. Of course, it may be cut out by other forming methods, for example, machining.

  Moreover, in the heat exchanger which concerns on this invention, the built-in thing which has a desiccant unit etc. can be accommodated in the header pipe in which the said flat surface A was formed. Further, a size relationship is given to the internal cross-sectional area of the two header pipes, and the larger header pipe is composed of a header pipe having the flat surface A and having a circular internal cross-sectional shape. be able to.

  Such a heat exchanger according to the present invention is suitable as a subcool type capacitor. In other words, the core portion of the heat exchanger is suitable as a subcool type capacitor in which the refrigerant condensing core portion that condenses the refrigerant and the subcool core portion that further subcools the refrigerant condensed in the refrigerant condensing core portion. It is. In this case, it is preferable that at least the lower part of the header pipe having the flat surface A and having a circular inner cross-sectional shape has a liquid storage function. Thereby, the liquid refrigerant can be caused to flow into the subcool core portion from the header pipe portion having a liquid storage function.

  In addition, the heat exchanger according to the present invention is particularly suitable as a condenser used in a vehicle air conditioner where installation space is limited.

  In such a heat exchanger according to the present invention, the header pipe structure in which the outer surface of the portion to which the heat exchange tube is connected is formed on the flat surface A by being offset to one side in the thickness direction of the heat exchanger, To reduce the gap between the adjacent device (for example, radiator) and the heat exchange tube without increasing the tube insertion dimension to the header pipe and reducing the diameter of the built-in material accommodated in the header pipe. At the same time, because the internal cross-sectional shape of the header pipe is formed in a circular shape, even when the internal pressure is evenly received on the inner surface of the header pipe and a large internal pressure is applied, deformation of the header pipe is suppressed, It is possible to prevent a significant decrease in the pressure resistance performance.

  As described above, according to the heat exchanger according to the present invention, without significantly reducing the pressure resistance performance of the header pipe, the insertion dimension of the heat exchange tube is increased, and the built-in material accommodated in the header pipe is reduced. It is possible to adopt a configuration in which the header pipe is offset to one side in the thickness direction of the heat exchanger without incurring a reduction in diameter, and with an optimum outer shape for installation while ensuring desired performance. A heat exchanger can be achieved. Therefore, even when the radiator is arranged on the front side as described above, the heat exchange tube and the radiator heat dissipating part are greatly separated, and the thickness of the heat exchanger (condenser) + radiator is increased. In addition, it is possible to prevent a decrease in the amount of air passing through the capacitor due to air leakage between the capacitor and the radiator.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
The heat exchanger according to the present invention is suitable as a condenser used in a vehicle air conditioner, and is particularly suitable as a subcool type condenser. The basic configuration of the subcool type capacitor is as shown in FIG. That is, the subcool type condenser 1 as a heat exchanger includes two header pipes, a small-diameter header pipe 2 and a large-diameter header pipe 61, and a plurality of parallel pipes disposed between the header pipes 2 and 61. A flat type heat exchange tube 4 and corrugated fins 5 provided between the heat exchange tubes 4 and in the outermost layer portion are provided. One header pipe 2 has a refrigerant inlet portion 6 and an outlet portion. 7 is provided, and a partition plate 8 is provided therein. The other header pipe 61 is formed as a large-diameter header pipe having an inner volume larger than that of the header pipe 2. In this header pipe 61, for example, a desiccant bag for removing moisture is held on the upper side. A built-in object 11 having an agent unit 9 and having a strainer 10 for removing foreign substances on the lower side is housed. The built-in object 11 is attached to and detached from the header pipe 61 by a holding plate 12 having a communication part at the center. Held possible. Of the entire core portion 13, a portion positioned above the partition plate 8 is configured as a refrigerant condensation core portion 14 that condenses the refrigerant, and a portion positioned below the partition plate 8 is condensed by the refrigerant condensation core portion 14. The subcooled core section 15 is configured to further supercool the cooled refrigerant. Water is removed from the refrigerant that has been condensed through the refrigerant condensing core portion 14 and has flowed into the header pipe 61 and foreign matter is removed, and the liquefied refrigerant is temporarily stored in the lower portion of the header pipe 61 (particularly, And temporarily stored in the lower portion 61a in the header pipe 61 functioning as a liquid reservoir, and then flows into the subcool core 15 and is supercooled. That is, the function of the receiver dryer in the refrigeration system is configured as a subcool type capacitor 1 that is integrated with the capacitor without providing a separate part.

  In the present invention, in the subcool type capacitor 1 configured as described above, one header pipe 61 has a flat outer surface at a portion to which the heat exchange tube 4 of the header pipe 61 is connected, for example, as shown in FIG. In addition to being formed in A, the internal cross-sectional shape of the header pipe 61 is circular. In the present embodiment, the outer surface portion of the header pipe 61 adjacent to the flat surface A in the circumferential direction of the header pipe 61 is also substantially formed on the flat surface B, and the header pipes 61 other than the flat surface A and the flat surface B are formed. The outer surface of is formed in a circular cross section. Accordingly, the portions forming the flat surface A and the flat surface B are formed thicker than the other portions. Such a header pipe 61 can be easily formed by an extrusion method as a header pipe (header pipe material) before processing the end insertion hole of the heat exchange tube.

  As shown in FIG. 9, a predetermined number of holes 62 into which the end portions of the heat exchange tubes 4 are inserted are machined in the header pipe 61 having such a shape. The header pipe 61 has a cross-sectional center position 63 that is one of the subcool type condenser 1 in the thickness direction center, that is, the width-direction center position 64 of the heat exchange tube 4 in that direction. It is arranged offset to the side. For example, when the radiators are arranged adjacent to each other as shown in FIG. 3, the offset direction is the anti-radiator direction, and the offset amount δ is equal to or less than the header pipe 61 of the other header pipe 2. What is necessary is just to set to the extent which does not protrude to the flat surface B side. However, even when the radiators are arranged adjacent to each other, there is an aspect in which the offset direction can be set to the radiator direction while employing the offset structure according to the present invention. For example, as shown in FIG. 10, the position of the header pipe 61 protrudes from the end of the radiator 40 in the width direction while keeping the gap between the radiator portion of the radiator 40 disposed adjacent to the core portion of the subcool type capacitor 1 small. Can be set to the radiator direction. In this case, the offset amount is not particularly limited.

  In the subcool type capacitor 1 (heat exchanger) configured as described above, since the end insertion hole 62 of the heat exchange tube 4 is processed in the flat surface A forming portion, an increase in the tube insertion dimension is prevented and built-in. There is no need to reduce the diameter of the object 11. Further, by offsetting the position of the center of the header pipe 61 on one side in the thickness direction of the subcool type capacitor 1, a sufficiently large inner volume can be secured, and the predetermined content can be obtained without reducing the diameter of the contents 11. The diameter contents 11 can be accommodated. Since the internal cross-sectional shape of the header pipe 61 is formed in a circular shape, the internal pressure is evenly received on the inner surface, and even when a large internal pressure is applied, it is prevented from being greatly deformed locally. The Therefore, the deterioration of the withstand voltage performance is prevented, and the subcool type capacitor 1 desirable for the withstand voltage performance is realized.

  That is, it is possible to ensure the eccentric structure of the header pipe 61 in a predetermined direction and the desired diameter of the housed object 11 to be accommodated while ensuring the desired pressure resistance performance of the header pipe 61. Therefore, even when the subcool type capacitor 1 is provided together with a radiator or the like as shown in FIG. 3, it is possible to prevent a large gap from being formed between the heat exchange tube 4 and the heat radiating portion of the radiator. It is possible to achieve an extremely advantageous arrangement on the vehicle by keeping the total thickness dimension of the subcool type capacitor 1 and the radiator small. Further, it is possible to prevent a decrease in the amount of air passing through the capacitor due to air leakage between the capacitor 1 and the radiator, and the subcool type capacitor 1 can exhibit desirable performance.

  11 and 12 show another embodiment of the present invention. In this embodiment, compared to the embodiment shown in FIGS. 8 and 9, the header pipe 71 is formed when the end insertion hole 72 of the heat exchange tube is processed in the header pipe 71 in the portion of the flat surface B of the header pipe 71. A recess 74 is formed to engage a jig 73 for fixing the. In this embodiment, since the recess 74 is formed over the entire length in the longitudinal direction of the header pipe 71, the header pipe 71 can be easily extruded into a predetermined cross-sectional shape even in a structure having the recess 74. .

  When the recess 74 is formed in the flat surface B in this way, the jig 73 is engaged with the recess 74 and the header pipe 71 is fixed when the end insertion hole 72 of the heat exchange tube is processed. Therefore, the rotation and escape of the header pipe 71 during processing can be surely prevented. As a result, the tube end insertion hole 72 having a desired shape and position can be processed with high accuracy. Other configurations, operations, and effects are in accordance with the above-described embodiment.

  The present invention can be applied to any parallel flow type heat exchanger in which at least one header pipe is required to have a large diameter, and is particularly suitable for an on-vehicle capacitor, particularly a subcool type capacitor.

It is a front view which shows the basic structural example of the subcool type capacitor | condenser as a heat exchanger. It is a cross-sectional view of one header pipe of a conventional subcool type capacitor. FIG. 3 is a partial cross-sectional display plan view showing an installation example of a capacitor including the header pipe of FIG. 2. FIG. 4 is a partial cross-sectional display plan view of the capacitor when the header pipe of FIG. 3 is eccentric. It is a cross-sectional view of one header pipe of another conventional subcool type capacitor. FIG. 6 is a partial sectional display plan view of a capacitor including the header pipe of FIG. 5. It is a cross-sectional view which shows the example of a malfunction of the header pipe of the capacitor | condenser of FIG. It is a transverse cross section of one header pipe of a subcool type capacitor concerning one embodiment of the present invention. It is a partial cross section display top view of the capacitor | condenser provided with the header pipe of FIG. FIG. 10 is a partial cross-sectional display plan view illustrating an example in which the offset direction of the header pipe of the capacitor in FIG. It is a cross-sectional view of one header pipe of a subcool type capacitor according to another embodiment of the present invention. It is a partial cross section display top view of a capacitor provided with the header pipe of Drawing 11.

Explanation of symbols

1 Heat exchanger (subcool type condenser)
2 Small-diameter header pipe 3, 21, 41, 51, 61, 71 Large-diameter header pipe 4 Heat exchange tube 4
DESCRIPTION OF SYMBOLS 5 Fin 6 Refrigerant inlet part 7 Refrigerant outlet part 8 Partition plate 9 Desiccant unit 10 Strainer 11 Built-in object 12 Holding plate 13 Core part (whole)
14 Refrigerant condensation core part 15 Subcool core part 30 Radiator 42 Tube end insertion dimension 62, 72 End insertion hole of heat exchange tube 63 Position of center of cross-section of offset header pipe 64 Position of center of heat exchanger in thickness direction 73 Jig 74 Recess A, B Flat surface δ Offset

Claims (10)

  In a parallel flow type heat exchanger in which a plurality of heat exchange tubes extending in parallel between two header pipes are arranged, at least one of the header pipes is positioned at the center of the cross section at the center in the thickness direction of the heat exchanger. The position is offset to one side in the thickness direction of the heat exchanger with respect to the position, and the outer surface of the portion to which the heat exchange tube of the header pipe is connected is formed on a flat surface A, and the inner cross section of the header pipe A heat exchanger having a circular shape.   The heat exchanger according to claim 1, wherein an outer surface of the header pipe adjacent to the flat surface A in the circumferential direction of the header pipe is also formed in a substantially flat surface B.   The heat exchanger according to claim 2, wherein outer surfaces of the header pipe other than the flat surface A and the flat surface B are formed in a circular cross section.   The heat exchange according to claim 2 or 3, wherein the flat surface B is formed with a recess for engaging a jig for fixing the header pipe when the end insertion hole of the heat exchange tube is processed in the header pipe. vessel.   The heat exchanger according to any one of claims 1 to 4, wherein the header pipe before the end insertion hole processing of the heat exchange tube is formed by extrusion molding.   The heat exchanger according to any one of claims 1 to 5, wherein a built-in object having a desiccant unit is accommodated in a header pipe in which the flat surface A is formed.   A size relationship is given to the internal cross-sectional area of the two header pipes, and the larger header pipe is composed of a header pipe having the flat surface A and having a circular internal cross-sectional shape. The heat exchanger according to any one of 6.   The core part of a heat exchanger consists of a subcool type | mold capacitor divided into the refrigerant | coolant condensation core part which condenses a refrigerant | coolant, and the subcool core part which further supercools the refrigerant | coolant condensed with this refrigerant | coolant condensation core part. The heat exchanger in any one of -7.   The heat exchanger according to claim 8, wherein at least a lower portion of the header pipe having the flat surface A and having a circular inner cross-sectional shape has a liquid storage function.   The heat exchanger in any one of Claims 1-9 which consists of a capacitor | condenser used for a vehicle air conditioner.

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