JP2005321151A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of arranging header pipes in an off-set state and preventing the impairing of productivity and the increase of weight of the header pipes. <P>SOLUTION: In this parallel flow type heat exchanger wherein a plurality of heat exchange tubes extended in parallel with each other are mounted between two header pipes, the entire core part of the heat exchanger is constituted in such a manner that a center position of a transverse section of at least one of the header pipes is offset to one side in the thickness direction of the heat exchanger with respect to a center position in the thickness direction of the heat exchanger. <P>COPYRIGHT: (C)2006,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 more particularly to a heat exchanger suitable as a condenser of a vehicle air conditioner, particularly a subcool type condenser.

  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 condensation 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 the 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.

  Further, 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. A structure is known in which an insertion hole of the heat exchange tube 4 is machined in the portion 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 built-in object 43 without increasing the tube insertion dimension 42 as shown in FIG. It becomes possible. However, in this case, since the internal cross-sectional shape of the header pipe 51 is not circular, when the internal pressure is increased, particularly in the portion where the flat surface A is formed and the portion where the flat surface adjacent thereto is formed. Deformation may occur and the pressure resistance of the header pipe 51 may be reduced.

  Therefore, in order to prevent such a problem, the outer surface of the portion of the header pipe 52 to which the heat exchange tube 4 is connected as shown in FIGS. Is formed on the flat surface A, and the internal cross-sectional shape of the header pipe 52 is circular (Patent Document 2).

However, in the structure as described above, as the surplus meat portion 53 increases as shown in FIG. 9, there is a risk of increasing the weight of the header pipe 52 and increasing the manufacturing cost. In addition, the header pipe 52 is usually formed by extrusion molding or the like. However, since the surplus meat portion 53 is present, strict dimensional accuracy is required at the time of molding as compared to the case of forming a circular tube having a circular cross-sectional shape. Therefore, productivity may be reduced.
JP 2003-185296 A

Japanese Patent Application No. 2003-319692

  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. It is possible to offset the header pipe in the thickness direction of the heat exchanger without reducing the diameter of the built-in components, prevent the pressure resistance of the header pipe from decreasing, and further improve productivity. It is another object of the present invention to provide a heat exchanger that can realize weight reduction and cost reduction.

  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. The entire part is bent so that the position of the center of the cross section of at least one header pipe is arranged offset to one side in the thickness direction of the heat exchanger with respect to the center position in the thickness direction of the heat exchanger. Consists of features.

  In such a heat exchanger, the entire core portion of the heat exchanger has at least one header pipe in the thickness direction of the heat exchanger with respect to the center position of the cross section of the header pipe in the thickness direction of the heat exchanger. When the adjacent equipment (for example, a radiator, etc.) that may interfere with the one header pipe exists on the downstream side in the ventilation direction, for example, the core portion of the heat exchanger Bend to the upstream side in the ventilation direction (for example, the anti-radiator side), and when adjacent equipment exists on the upstream side in the ventilation direction, bend the entire core of the heat exchanger to the downstream side in the ventilation direction (for example, the radiator side) Can be made. Therefore, in a parallel flow type heat exchanger that requires a large cross-sectional area of at least one header pipe, it is possible to reduce the gap between adjacent equipment (for example, a radiator) and a heat exchange tube. become. In other words, it is possible to offset the header pipe in the heat exchanger thickness direction without increasing the tube insertion dimension into the one header pipe and reducing the diameter of the built-in material accommodated in the header pipe. Become.

  In such a heat exchanger, the at least one header pipe can be formed of a circular tube having a circular cross-sectional shape, so that the internal cross-sectional shape can be formed in a circular shape. Therefore, 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 can be suppressed to prevent the pressure resistance performance from being lowered. Moreover, since the surplus meat part can be abolished, productivity can be improved, and weight reduction and cost reduction can be realized.

  Such a heat exchanger according to the present invention is suitable as a subcool type capacitor. In other words, the entire core portion of the heat exchanger is suitable as a subcool type capacitor partitioned into a refrigerant condensation core portion that condenses the refrigerant and a subcool core portion that further supercools the refrigerant condensed in the refrigerant condensation core portion. Is. In this case, it is preferable that at least the lower part of the header pipe 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 the 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.

  Thus, according to the heat exchanger according to the present invention, without reducing the pressure resistance performance of the header pipe, and increasing the insertion dimension of the heat exchange tube, the diameter of the built-in material accommodated in the header pipe 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 reduction, and heat exchange with an optimum outer shape for installation while ensuring desired performance Can be achieved. Therefore, even when adjacent equipment such as a radiator is adjacent, the heat exchanger tube and the radiator's heat radiation part are greatly separated, the thickness of the heat exchanger (condenser) + radiator is increased, It is possible to prevent a decrease in the amount of air passing through the capacitor due to air leakage between the radiators.

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 a plurality of header pipes, a small-diameter header pipe 2 and a large-diameter header pipe 3, and a plurality of parallel pipes disposed between the header pipes 2 and 3. It has flat heat exchange tubes 4 and corrugated fins 5 provided between the heat exchange tubes 4 and in the outermost layer portion. One header pipe 2 has an inlet portion 6 and an outlet portion for refrigerant. 7 is provided, and a partition plate 8 is provided therein. The other header pipe 3 is formed as a large-diameter header pipe having an inner volume larger than that of the header pipe 2, and in this header pipe 3, 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. Moisture is removed from the refrigerant that has been condensed through the refrigerant condensing core portion 14 and has flowed into the header pipe 3 and foreign matters are removed, and the liquefied refrigerant is temporarily stored in the lower portion of the header pipe 3 (particularly, And temporarily stored in the lower part 3a in the header pipe 3 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 subcool type condenser 1 (heat exchanger) configured as described above, as shown in FIG. 10, the entire core portion 13 of the heat exchanger is positioned at the center of the cross section of at least one header pipe 3 as the heat exchanger. It is bent so as to be arranged offset to one side in the thickness direction of the heat exchanger with respect to the center position in the thickness direction. For example, as shown in FIG. 11, when the radiator 30 is present as the adjacent device on the downstream side in the ventilation direction, the bent portion 16 can be obtained by bending the entire core portion 13 of the heat exchanger toward the upstream side (anti-radiator side) in the ventilation direction. The header pipe 3 side ahead is arranged offset to the opposite side of the radiator 30. Accordingly, since it is possible to reduce the gap between the header pipe 3 and the radiator 30 while preventing interference between the header pipe 3 and the radiator 30, 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. become. That is, the header pipe 3 can be offset in the heat exchanger thickness direction without increasing the tube insertion dimension into the header pipe 3 and reducing the diameter of the built-in object 11 accommodated in the header pipe 3. It becomes.

  In such a heat exchanger, the header pipe 3 can be formed of a circular tube having a circular cross-sectional shape, so that the internal cross-sectional shape can be formed in a circular shape. Therefore, even when the internal pressure is evenly received by the inner surface of the header pipe 3 and a large internal pressure is applied, the deformation of the header pipe 3 can be suppressed and the pressure resistance performance can be prevented from being lowered. Moreover, since the surplus meat part can be abolished, productivity by extrusion molding or the like can be improved, and weight reduction and cost reduction can be realized.

  FIG. 12 shows an arrangement example of the subcool type condenser 1 (heat exchanger) according to another embodiment of the present invention. In FIG. 11, the entire core portion 13 of the heat exchanger is bent to the upstream side in the ventilation direction, but rather than the contact between the header pipe 3 and the radiator 30, the contact with the adjacent equipment existing on the upstream side in the ventilation direction. If there is a fear of fear, as shown in FIG. 12, the entire core portion 13 of the heat exchanger 13 may be bent toward the downstream side (radiator side) in the ventilation direction.

  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 arrangement 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 cross-sectional display plan view illustrating an arrangement example of a capacitor including the header pipe of FIG. 5. It is a cross-sectional view of one header pipe of a subcool type capacitor according to the previous proposal of the present applicant. It is a partial cross section display top view of a capacitor provided with the header pipe of Drawing 7. It is a cross-sectional view which shows the surplus meat part of the header pipe of FIG. It is a partial section display top view of a capacitor concerning one embodiment of the present invention. FIG. 11 is a partial cross-sectional display plan view illustrating an arrangement example of the capacitor of FIG. 10. It is a partial section display top view showing the example of arrangement of the capacitor concerning another embodiment of the present invention.

Explanation of symbols

1 Heat exchanger (subcool type condenser)
2 Small diameter header pipe 3, 21, 41, 51, 52 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, 43 Built-in object 12 Holding plate 13 Whole core part 14 Refrigerant condensing core part 15 Subcool core part 16 Bending part 30 Radiator 42 Tube end Part insertion dimension 53 Excess meat part A Flat surface

Claims (7)

  In a parallel flow type heat exchanger having a plurality of heat exchange tubes extending in parallel between two header pipes, the entire core portion of the heat exchanger is heated at the center of the cross section of at least one header pipe. A heat exchanger, wherein the heat exchanger is bent so as to be arranged offset to one side in the thickness direction of the heat exchanger with respect to the center position in the thickness direction of the exchanger.   The heat exchanger according to claim 1, wherein the entire core portion of the heat exchanger is bent upstream in the ventilation direction.   The heat exchanger according to claim 1, wherein the entire core portion of the heat exchanger is bent downstream in the ventilation direction.   The heat exchanger according to any one of claims 1 to 3, wherein a built-in object having a desiccant unit is accommodated in the one header pipe.   The heat exchanger according to any one of claims 1 to 4, wherein a size relationship is given to an internal cross-sectional area of the two header pipes, and the one header pipe is a larger header pipe.   The core part of the said 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 supercools the refrigerant | coolant cooled with this refrigerant | coolant condensation core part. The heat exchanger in any one of 5 thru | or 5.   The heat exchanger according to any one of claims 1 to 6, comprising a condenser used in a vehicle air conditioner.

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