JP2017125635A - Heat exchanger and evaporator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger capable of suppressing degradation of cooling efficiency in a case of being applied to an evaporator.SOLUTION: A set of a leeward-side upper header portion 5 and a windward-side upper header portion 6 of an evaporator 1 in which a heat exchanger is employed is formed by dividing the inside of an upper header tank 2 into two in a ventilation direction by a partitioning member 10 having its longitudinal direction oriented in a lateral direction. A refrigerant inlet 7 is formed on one end of the leeward-side upper header portion 5, and a refrigerant outlet 8 is formed on the same end as the refrigerant inlet 7, of the windward-side upper header portion 6. An inflow section 5A into which a refrigerant flows through the refrigerant inlet 7 is defined on the whole leeward-side upper header portion 5 provided with the refrigerant inlet 7, and an outflow section 6A to which the refrigerant flows out through the refrigerant outlet 8 is defined on the whole windward-side upper header portion 6. The inflow section 5A and the outflow section 6A are kept from communicating with each other by the partitioning member 10. The whole partitioning member 10 has a heat insulation space.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat exchanger used as, for example, an evaporator or a heater core of a car air conditioner.

  In this specification and claims, the top and bottom, left and right (up and down, left and right in FIG. 1) when viewed from the upstream side in the ventilation direction indicated by arrow X in FIG.

  In this specification, the term “aluminum” includes aluminum alloys in addition to pure aluminum.

    For example, as an evaporator used in a car air conditioner that is a refrigeration cycle mounted on an automobile, a leeward side tube array composed of a plurality of heat exchange tubes arranged at intervals in the left-right direction with the longitudinal direction thereof being directed vertically. An leeward tube row comprising a plurality of heat exchange tubes arranged side by side in the left-right direction with the longitudinal direction facing the up-down direction and arranged on the leeward side of the leeward-side tube row, A leeward upper header section and a leeward lower header section, which are arranged on both upper and lower sides of the heat exchange tubes of the side tube row with the longitudinal direction facing the left and right direction, and to which all the heat exchange tubes of the leeward tube row are connected, Upwind where the longitudinal direction is arranged on both the upper and lower sides of the heat exchange tubes in the upper tube row with the longitudinal direction facing left and right, and all heat exchange tubes in the windward tube row are connected The upper header part and the windward lower header part are provided, and the pair consisting of the leeward upper header part and the windward upper header part, and the pair consisting of the leeward lower header part and the windward lower header part, respectively. It is formed by dividing the inside of the upper header tank made of aluminum and the inside of the lower header tank into two parts in the ventilation direction by an aluminum solid partition plate whose longitudinal direction is directed to the left and right, and at one end of the leeward side upper header part An evaporator provided with a refrigerant inlet and having a refrigerant outlet at the same end as the refrigerant inlet in the windward upper header portion so that the refrigerant flowing from the refrigerant inlet flows out of the refrigerant outlet through the total heat exchange tube It is known (see Patent Document 1).

  However, in the evaporator described in Patent Document 1, a solid partition plate that divides the inside of the upper header tank into the leeward upper header part and the windward upper header part, and the leeward lower header part and the windward lower part in the lower header tank Since the thermal conductivity of the solid partition plate divided into the header portion is relatively high, it is provided at the same position in the longitudinal direction of the leeward upper header portion and the windward upper header portion and is arranged in the ventilation direction, and by the partition plate When there is a relatively large temperature difference between the refrigerants in both compartments in the two compartments that are in a non-communication state, a relatively large amount of heat is transmitted between the refrigerants in both compartments via the partition plate. become. In particular, a refrigerant inlet is provided at one end of the leeward upper header part, a refrigerant outlet is provided at the same end as the refrigerant inlet in the leeward upper header part, and the refrigerant inlet is passed through the header part provided with the refrigerant inlet. An inflow section into which the refrigerant flows is provided, an outflow section through which the refrigerant flows out through the refrigerant outlet is provided in the header portion provided with the refrigerant outlet, and the inflow section and the outflow section overlap at least partially in the left-right direction and Since the partition plate is in a non-communication state, much heat of the relatively high-temperature refrigerant that has flowed through the total heat exchange tube and entered the outflow compartment is transferred to the relatively low-temperature refrigerant that has flowed into the inflow compartment. It will be. Therefore, the heat exchange efficiency of the entire evaporator, that is, the cooling efficiency is lowered.

  In the evaporator described in Patent Document 1, the leeward upper header portion is provided with first and second sections arranged in the longitudinal direction and separated from each other, and the leeward upper header portion is disposed in the longitudinal direction. The third and fourth sections are arranged in parallel and separated from each other, and the first section and the third section, and the second section and the fourth section are provided at the same position in the longitudinal direction of the upper header portions. Are arranged in the ventilation direction, and the first and third sections are separated from each other by a partition plate, and the second section and the fourth section are communicated with each other. The first section of the leeward upper header section is an inflow section, and the third section of the leeward upper header section is an outflow section. In addition, two sections in which the entirety of the leeward lower header part and the entire leeward lower header part are provided at the same position in the longitudinal direction of the upper header parts, are arranged in the ventilation direction, and are not communicated with each other by the partition plates. It has become.

JP 2012-251736 A

  An object of the present invention is to provide a heat exchanger that can solve the above-described problems and can suppress a decrease in heat exchange efficiency and an evaporator that can suppress a decrease in cooling efficiency.

  In order to achieve the above object, the present invention comprises the following aspects.

1) Provided side by side on the leeward side of the leeward tube row composed of a plurality of heat exchange tubes arranged at intervals in the left-right direction with the longitudinal direction facing up and down, and in the longitudinal direction A windward side tube row consisting of a plurality of heat exchange tubes arranged at intervals in the left-right direction with the direction directed in the up-down direction, and a longitudinal direction on the upper and lower sides of the heat exchange tubes of the leeward side tube row in the left-right direction The leeward side upper header part and the leeward side lower header part to which all heat exchange tubes of the leeward side tube row are connected and the upper and lower sides of the heat exchange tubes of the leeward side tube row in the longitudinal direction A windward upper header section and a windward lower header section to which all the heat exchange tubes of the windward tube array are connected, and are called a windward upper header section and a windward upper header section. And at least one of the pair consisting of the leeward lower header part and the leeward lower header part includes two header tanks in the ventilation direction by a partition member whose longitudinal direction is directed in the left-right direction. A heat exchanger formed by being divided into parts,
At least one part in the left-right direction overlaps at least one of the group consisting of the leeward upper header part and the windward upper header part and the group consisting of the leeward lower header part and the windward lower header part. And the partition made into the non-communication state by the partition member is provided, and the part located at least between the said partitions in a partition member has a heat insulation space.

  2) The heat exchanger according to 1) above, wherein the entire partition member is made of a foam metal having a plurality of bubbles that are independent from each other and serve as a heat insulating space.

  3) The heat exchanger as described in 1) above, wherein the entire partition member is made of a metal extruded profile, and has a heat insulating space extending in the extrusion direction and separated from the header portions on both sides of the ventilation direction.

  4) The heat according to 1) above, wherein the entire partition member is composed of two metal plate-like portions joined to each other, and a heat insulating space is formed between both metal plate-like portions and separated from the header portions on both sides in the ventilation direction. Exchanger.

5) An evaporator comprising the heat exchanger according to any one of 1) to 4) above,
Refrigerant is applied to one end of the leeward header portion of either the leeward upper header portion and the leeward upper header portion, or the leeward lower header portion and the leeward lower header portion. An inlet is provided, a refrigerant outlet is provided at the same end as the refrigerant inlet in the windward header section, an inlet section through which the refrigerant flows through the refrigerant inlet is provided in the header section provided with the refrigerant inlet, and the refrigerant outlet Is provided with an outflow section through which the refrigerant flows out through the refrigerant outlet, and the inflow section and the outflow section overlap at least partly in the left-right direction and are not communicated by the partition member. An evaporator in which at least a portion of the member located between the two compartments has a plurality of independent heat insulating spaces.

  According to the heat exchangers of the above 1) to 4), at least any of a group consisting of the leeward upper header part and the windward upper header part and a group consisting of the leeward lower header part and the windward lower header part In one of the sets, a partition that is at least partially overlapped in the left-right direction and is in a non-communication state by the partition member is provided, and at least a portion of the partition member that is positioned between the two partitions is independent of each other. Even if the partition member is made of aluminum in the same manner as the partition plate of the evaporator described in Patent Document 1, the thermal conductivity of the portion located between the two sections of the partition member is It becomes lower than the heat conductivity of the partition plate of the evaporator of 1. Accordingly, in both the compartments, even when there is a relatively large temperature difference between the refrigerants in the two compartments, heat transfer via the partition member between the refrigerants in the two compartments is suppressed. As a result, a decrease in the cooling efficiency of the entire heat exchanger is suppressed.

  According to the heat exchangers 2) to 4), a plurality of heat insulating spaces independent of the partition member can be formed with a relatively simple configuration.

  According to the evaporator 5), the following effects are obtained. That is, in the evaporator, the refrigerant flowing from the refrigerant inlet is at a relatively low temperature, and the refrigerant flowing out from the refrigerant outlet is at a relatively high temperature, so the temperature difference between the two refrigerants becomes large. Therefore, one end part of the leeward header part in either one of the group consisting of the leeward upper header part and the leeward upper header part and the group consisting of the leeward lower header part and the windward lower header part And a refrigerant outlet is provided at the same end as the refrigerant inlet in the windward header portion, and an inflow section through which the refrigerant flows through the refrigerant inlet is provided in the header portion provided with the refrigerant inlet, The header section provided with the refrigerant outlet is provided with an outflow section through which the refrigerant flows out through the refrigerant outlet, and the inflow section and the outflow section overlap at least partly in the left-right direction and are not communicated by the partition member. In the evaporator, when the partition member is made of a solid partition plate made of aluminum like the evaporator described in Patent Document 1, the outflow section flows through the total heat exchange tube. Many heat of the of containing relatively high-temperature refrigerant in is transmitted to the relatively low temperature of the refrigerant flowing into the inlet compartment, the temperature of the refrigerant flowing in the compartment rises, the cooling efficiency of the evaporator is reduced. However, if the part located between the inflow section and the outflow section of the partition member has a heat insulating space like the evaporator in 5) above, there is a relatively large temperature difference between the refrigerants in both sections. Even so, heat transfer through the partition member between the refrigerants in both compartments is suppressed. Therefore, a decrease in the cooling efficiency of the entire evaporator is suppressed.

1 is a partially cutaway perspective view schematically showing an overall configuration of an evaporator to which a heat exchanger according to the present invention is applied. It is a cross-sectional view of the upper header tank of the evaporator of FIG. It is a figure equivalent to FIG. 2 which shows the modification of the partition member used for the evaporator of FIG. It is a figure equivalent to FIG. 2 which shows the other modification of the partition member used for the evaporator of FIG. It is a disassembled perspective view which shows a part of upper header tank using the partition member of FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  In the following description, the same components and the same parts are denoted by the same reference symbols throughout the drawings.

  FIG. 1 schematically shows the overall configuration of an evaporator to which a heat exchanger according to the present invention is applied, and FIG. 2 shows the configuration of the main part thereof.

  1 and 2, the evaporator (1) is composed of an aluminum upper header tank (2) and an aluminum lower header tank (3) that are spaced apart in the vertical direction with the longitudinal direction directed in the left-right direction. And a heat exchange core part (4) provided between the header tanks (2) and (3).

  The upper header tank (2) includes a leeward upper header portion (5) located on the leeward side and an upwind header portion (6) located on the leeward side and integrated with the leeward upper header portion (5). And. The upper header sections (5) and (6) are divided into two parts in the ventilation direction by a vertical plate-shaped aluminum partition member (10) with the longitudinal direction in the left-right direction inside the upper header tank (2). Is formed. The entire partition member (10) is made of foamed aluminum (foamed metal) having a plurality of bubbles that are independent from each other and serve as a heat insulating space. A refrigerant inlet (7) is provided at the right end of the leeward upper header (5), and a refrigerant outlet (8) is provided at the right end of the leeward upper header (6). An inflow section (5A) through which refrigerant flows in through the refrigerant inlet (7) is provided in the entire leeward upper header section (5), and the refrigerant through the refrigerant outlet (8) in the entire leeward upper header section (6). An outflow section (6A) is provided to discharge water. The inflow section (5A) and the outflow section (6A) are at least partially overlapped in the left-right direction, here the whole overlap, and are in a non-communication state by the partition member (10).

  The lower header tank (3) includes a leeward lower header portion (9) located on the leeward side and an upwind lower header portion (11) located on the leeward side and integrated with the leeward lower header portion (9). And. The lower header sections (9) and (11) are divided into two parts in the ventilation direction by a vertical plate-shaped aluminum partition member (17) with the longitudinal direction in the left-right direction in the lower header tank (3). Is formed. As the partition member (17), a member made of foamed aluminum may be used similarly to the partition member (10) of the upper header tank (2), or a member made of a solid aluminum plate may be used. . The leeward lower header portion (9) and the leeward lower header portion (11) are communicated with each other through a communication hole (not shown) formed in the partition member (17), for example.

  In the heat exchange core part (4), a plurality of flat aluminum heat exchange tubes (12) arranged at intervals in the left-right direction with the longitudinal direction oriented in the vertical direction and the width direction directed in the ventilation direction And a leeward side tube row (13A) and an upside tube row (13B) arranged in the ventilation direction. The upper and lower ends of the heat exchange tube (12) of the leeward side tube row (13A) are joined to the leeward side upper header portion (5) and the leeward side lower header portion (9) by brazing, and the windward side tube row (13B The upper and lower ends of the heat exchange tube (12) are joined to the windward upper header part (6) and the windward lower header part (11) by brazing.

  Both tube rows (13A) are placed outside the ventilation gap (14) between the heat exchange tubes (12) adjacent in the left-right direction of both tube rows (13A) (13B) and the heat exchange tubes (12) at both left and right ends. ) (13B) aluminum corrugated fins (15) are arranged so as to be shared across the heat exchange tubes (12), brazed to both heat exchange tubes (12), and corrugated fins (15) on both left and right ends Aluminum side plates (16) are arranged on the outer sides of the corrugated fins and brazed to the corrugated fins (15). A ventilation gap (14) is also formed between the heat exchange tubes (12) at the left and right ends and the side plates (16).

  The above-described evaporator (1) includes a compressor that uses a vehicle engine as a drive source, a condenser that cools the refrigerant discharged from the compressor (refrigerant cooler), and an expansion valve that reduces the refrigerant that has passed through the condenser (decompressor). A refrigeration cycle is configured with it, and it is installed in a car as a car air conditioner. When the compressor is in operation, the low-pressure gas-liquid mixed phase two-phase refrigerant compressed by the compressor and passed through the condenser and the expansion valve passes through the refrigerant inlet (7) and enters the evaporator (1). Enter the refrigerant inflow section (5A) of the leeward upper header section (5), enter the leeward lower header section (9) through the total heat exchange tube (12) of the leeward tube row (13A), and lower header It enters the windward lower header portion (11) through the communication hole formed in the partition member (10) of the tank (3). The refrigerant that has entered the windward lower header portion (11) passes through the total heat exchange tube (12) of the windward tube row (13B) and enters the outflow section (6A) of the windward upper header portion (6). It flows out from the refrigerant outlet (8). And while a refrigerant | coolant flows through the inside of a heat exchange tube (12), it heat-exchanges with the air which passes a ventilation gap (14), and a refrigerant | coolant flows out into a gaseous phase.

  At this time, the refrigerant that has entered the inflow section (5A) of the leeward upper header part (5) through the refrigerant inlet (7) is relatively low temperature, and the leeward tube row from the windward lower header part (11). The refrigerant that has entered the outflow section (6A) of the upwind header section (6) through the total heat exchange tube (12) of (13B) is relatively hot and is in the inflow section (5A) and outflow section. Although a relatively large temperature difference exists between the refrigerants in (6A), since the partition member (10) is made of foamed aluminum having a plurality of bubbles that are independent from each other and become a heat insulating space, the partition member ( The transfer of much heat from the refrigerant in the outflow section (6A) to the refrigerant in the inflow section (5A) via 10) is suppressed. Therefore, a decrease in the cooling efficiency of the entire evaporator (1) is suppressed.

  In the evaporator (1) of the above-described embodiment, the communication hole is formed in the partition member (17) of the lower header tank (3), so that the refrigerant flowing from the refrigerant inlet (7) is transferred to the total heat exchange tube (12 ) Through the refrigerant outlet (8). However, the mode for allowing the refrigerant flowing in from the refrigerant inlet (7) to flow out of the refrigerant outlet (8) through the total heat exchange tube (12) is not limited to this, and can be changed as appropriate. For example, like the evaporator described in Patent Document 1, the leeward upper header portion is provided with two first and second sections arranged in the longitudinal direction and separated from each other, and the leeward upper header portion has a longitudinal Third and fourth compartments arranged in the direction and separated from each other are provided, and the first compartment and the third compartment, and the second compartment and the fourth compartment are at the same position in the longitudinal direction of the upper header portions. The first section and the third section are two sections that are not connected to each other by a partition member, and the second section and the fourth section are communicated with each other. The two sections in which the whole in the leeward lower header part and the entire leeward lower header part are provided at the same position in the longitudinal direction of both the lower header parts and are arranged in the ventilation direction and are not communicated with each other by the partition plate You can have me. In this case, a portion located between at least the first section and the third section in the partition member between the leeward upper header section and the leeward upper header section, and the leeward lower header section and the leeward lower header section The whole partition member has a plurality of independent heat insulating spaces.

  3 to 5 show modifications of the partition member used in the upper header tank (2) of the evaporator (1) shown in FIG.

  The partition member (20) shown in FIG. 3 is made of an aluminum extruded profile, and has a plurality of heat insulation spaces (21) extending in the extrusion direction, here in the left-right direction, and extending in the vertical direction. . The adiabatic space (21) is not in communication with the inflow section (5A) of the leeward upper header section (5) and the outflow section (6A) of the leeward upper header section (6).

  Note that an aluminum extruded shape partition member in which the extrusion direction is the vertical direction and a plurality of heat insulating spaces extending in the vertical direction and extending over the entire height are formed in the horizontal direction may be used.

  The partition member (30) shown in FIGS. 4 and 5 is composed of two aluminum plate-like portions (31) joined together by brazing and connected and integrated at the upper end portion. A plurality of sealed heat insulating spaces (32) are formed in the left-right direction. The heat insulation space (32) is not in communication with the inflow section (5A) of the leeward upper header section (5) and the outflow section (6A) of the leeward upper header section (6). The heat insulating space (32) is composed of a bulging portion (33) formed at the same position in the left-right direction of the two plate-like portions (31), and the bulging portion (33) of one plate-like portion (31) is formed. The opening is closed by the bulging portion (33) of the other plate-like portion (31).

  The partition member (30) is formed by pressing a flat aluminum plate to form a plurality of bulged portions (33) at intervals in the longitudinal direction in the half of the width direction of the aluminum plate, Are folded and overlapped so that the opening of the bulging portion (33) is on the inner side at the center line in the width direction.

  In the above-described embodiment, the heat exchanger according to the present invention is applied to an evaporator of a car air conditioner. However, the present invention is not limited to this and can be applied to a heater core of a car air conditioner. In the case of the heater core, the configuration is the same as that of the evaporator (1) in FIG.

  The heat exchange according to the present invention is suitably used for an evaporator of a refrigeration cycle constituting a car air conditioner.

(1): Evaporator
(2) (3): Header tank
(5): Upper header on the leeward side
(5A): Inflow compartment
(6): Upwind header
(6A): Outflow compartment
(7): Refrigerant inlet
(8): Refrigerant outlet
(12): Heat exchange tube
(13A) (13B): Tube row
(10) (20) (30): Partition member
(21) (32): Thermal insulation space

Claims (5)

A leeward side tube row composed of a plurality of heat exchange tubes arranged at intervals in the left-right direction with the longitudinal direction oriented in the up and down direction, and provided alongside the leeward side of the leeward side tube row, and the longitudinal direction A windward side tube row composed of a plurality of heat exchange tubes arranged in the left-right direction in a state of being directed in the up-down direction, and a longitudinal direction facing the left and right sides of the heat exchange tubes of the leeward side tube row in the left-right direction The leeward side upper header part and the leeward side lower header part to which the total heat exchange tubes of the leeward side tube row are connected and the upper and lower sides of the heat exchange tubes of the windward side tube row are oriented with the longitudinal direction in the left and right direction. A windward upper header section and a windward lower header section that are disposed and connected to the total heat exchange tubes of the windward tube array, and are provided with a windward upper header section and a windward upper header section. And at least one of the pair consisting of the leeward lower header part and the leeward lower header part includes two header tanks in the ventilation direction by a partition member whose longitudinal direction is directed in the left-right direction. A heat exchanger formed by being divided into parts,
At least one part in the left-right direction overlaps at least one of the group consisting of the leeward upper header part and the windward upper header part and the group consisting of the leeward lower header part and the windward lower header part. And the partition made into the non-communication state by the partition member is provided, and the part located at least between the said partitions in a partition member has a heat insulation space. The heat exchanger according to claim 1, wherein the entire partition member is made of a foam metal having a plurality of bubbles that are independent from each other and become a heat insulating space. 2. The heat exchanger according to claim 1, wherein the entire partition member is made of a metal extruded profile and has heat insulating spaces extending in the extrusion direction and separated from the header portions on both sides of the ventilation direction. The heat exchanger according to claim 1, wherein the entire partition member is composed of two metal plate-like portions joined to each other, and a heat insulating space is formed between both metal plate-like portions and separated from the header portions on both sides in the ventilation direction. . An evaporator comprising the heat exchanger according to any one of claims 1 to 4,
Refrigerant is applied to one end of the leeward header portion of either the leeward upper header portion and the leeward upper header portion, or the leeward lower header portion and the leeward lower header portion. An inlet is provided, a refrigerant outlet is provided at the same end as the refrigerant inlet in the windward header section, an inlet section through which the refrigerant flows through the refrigerant inlet is provided in the header section provided with the refrigerant inlet, and the refrigerant outlet Is provided with an outflow section through which the refrigerant flows out through the refrigerant outlet, and the inflow section and the outflow section overlap at least partly in the left-right direction and are not communicated by the partition member. An evaporator in which at least a portion located between the two sections of the member has a heat insulating space.

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