JP2014234012A - Evaporator and vehicle air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an evaporator and a vehicle air conditioner using an evaporator capable of achieving size reduction by reducing a size in a front to rear direction of the vehicle air conditioner.SOLUTION: A vehicle air conditioner comprises: a casing 1; a temperature adjustment unit 3 provided in the casing 1; an evaporator 20 arranged in the temperature adjustment unit 3; and a blower blowing air to a ventilation trunk 2 in the casing 1 and blowing the temperature-adjusted air by the temperature adjustment unit 3 into a compartment. A width in a ventilation direction of a heat exchange core 23 of the evaporator 20 is smaller than a size twice as large as an outside diameter of a refrigerant outlet tube, a width in the ventilation direction of each of header tanks 21 and 22 is larger than the size twice as large as the outside diameter of the refrigerant outlet tube, and an internal cross-sectional area of each of leeward headers 21a and 22a and windward headers 21b and 22b of the respective header tanks 21 and 22 is equal to or larger than an internal cross-sectional area of the refrigerant outlet tube.

Description

  The present invention relates to an evaporator mounted on an automobile and a vehicle air conditioner.

  In this specification and claims, the front (the left side in FIGS. 1 and 4) of the vehicle in which the vehicle air conditioner is used is referred to as the front, and the rear (the right side in FIGS. 1 and 4) is referred to as the rear. The up and down direction (up and down in FIGS. 1 and 4) is referred to as up and down, and the left and right direction of the vehicle (left and right direction when looking forward from the rear, left and right in FIG. 3) is referred to as left and right.

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

  Conventionally, as a vehicle air conditioner, as shown in FIGS. 3 and 4, the air inlet (1a) and the air outlet (1b) are provided, and the air inlet (1a) and the air outlet are passed inside. A synthetic resin casing (1) in which a ventilation path (2) is formed, and a temperature adjustment section (3) that is provided in the casing (1) and adjusts the temperature of the air sent into the ventilation path (2). In addition, air is sent into the ventilation path (2) of the casing (1) through the evaporator (4) disposed in the temperature control section (3) and the air inlet (1a), and the temperature control section (3) adjusts the temperature. And a blower (5) that blows out the air that has been discharged into the vehicle interior through the air delivery port (1b), and the temperature control unit (3) is downstream of the evaporator (4) in the air flow direction in the casing (1). Heater core (7) arranged on the side, the amount of air sent to the heater core (7) after passing through the evaporator (4) and A vehicle air conditioner having an air mix damper (8) that adjusts the ratio of the amount of air that bypasses the heater core (7) after passing through the vaporizer (4) is widely used (see, for example, Patent Document 1). ).

  In the vehicle air conditioner described in Patent Document 1, an air introduction port (1a) is provided at a front portion of the left end portion of the casing (1) with respect to the evaporator (4), and the blower (5) is disposed on the left side of the casing (1). And the air blower (5a) of the blower (5) is connected to the air intake inlet (1a), and the ventilation path (in the casing (1)) ( A guide part (6) for sending the air introduced into the ventilation path (2) from the air inlet (1a) to the front part of the evaporator (4) is provided in the front part of the evaporator (4) in 2). Yes.

  Further, in the vehicle air conditioner described in Patent Document 1, the air heating unit (9) and the air heating unit (9) are arranged downstream of the evaporator (4) in the ventilation path (2) in the casing (1). ) Is provided, and the heater core (7) of the temperature control unit (3) is disposed in the air heating unit (9) of the ventilation path (2) in the casing (1). The air mix damper (8) includes a rotating shaft portion (8a) and a shielding portion (8b) extending from the rotating shaft portion (8a) toward the evaporator (4) and rotating around the rotating shaft portion (8a). ), And a first position for sending all air that has passed through the evaporator (4) to the heater core (7) of the air heating section (9) (see the chain line in FIG. 4), and the evaporator (4) The opening of the shielding part (8b) is appropriately changed between the second position (see the solid line in FIG. 4) that sends all the air that has passed to the bypass part (11) to bypass the heater core (7). The ratio between the flow rate of air passing through the heater core (7) and the flow rate of air bypassing the heater core (7) is adjusted.

  Although there is no detailed description in Patent Document 1, the evaporator (4) is arranged with a space in the vertical direction with the longitudinal direction facing the left-right direction, and the leeward header portions (12a) (13a). And a pair of upper and lower header tanks (12) (13) having an upwind header section (12b) (13b) arranged on the leeward side of the leeward header sections (12a) (13a), and both header tanks (12) ( 13) a plurality of leeward refrigerant circulation pipes (15) provided at both ends and communicating with the leeward header portions (12a) (13a) of both header tanks (12) (13) and both header tanks (12 ) (13) and a heat exchange core section (14) having a plurality of upwind refrigerant flow pipe sections (16) communicating with the upwind header sections (12b) (13b), on the other hand, here the upper header tank A refrigerant inlet is provided at one end of the leeward header portion (12a) of (12), and a refrigerant outlet is also provided at the same end as the refrigerant inlet in the upwind header portion (12b). A refrigerant inlet pipe (17) is connected to the outlet and an outlet pipe (18) is connected to the refrigerant outlet, and the refrigerant flow pipe parts (15) (16) adjacent to each other in the left-right direction of the heat exchange core part (14) are connected. The thing in which the ventilation gap which the front and rear both ends opened between is formed is used widely. The refrigerant inlet pipe (17) and the outlet pipe (18) extend through the wall of the casing (1) to the outside. Therefore, the guide part (6) of the ventilation path (2) of the casing (1) is used to convert the air introduced into the ventilation path (2) from the air inlet (1a) into the header tank (12) of the evaporator (4). The refrigerant is sent from one side in the longitudinal direction of (13) to the front side of the heat exchange core portion (14) from a direction orthogonal to the longitudinal direction of the refrigerant flow pipe portions (24) and (25).

  Recently, there has been a demand for miniaturization of a vehicle air conditioner for the purpose of securing a space in a vehicle cabin. However, in the vehicle air conditioner described in Patent Document 1, in order to avoid interference between the shielding part (8b) of the air mix damper (8) and the heat exchange core part (14) of the evaporator (4), the casing ( It is necessary to increase the distance d between the front and rear ends of 1), and it is difficult to reduce the size of the vehicle air conditioner.

  In order to reduce the distance d between the front and rear ends of the casing (1) described in Patent Document 1 and to reduce the size of the vehicle air conditioner, the shielding unit (8a) is separated from the rotating shaft (8a) of the air mix damper (8). 8b) It is effective to shorten the length L1 to the tip or to reduce the width in the front-rear direction of the guide portion (6) of the ventilation path (2), but in the former case, the air heating section (9 ) And the opening area of the upstream end portion of the detour portion (11) must be reduced, and the air side passage resistance when air flows through the air heating portion (9) and the detour portion (11) is increased, In the latter case, there is a problem that the air-side passage resistance when air flows through the guide portion (6) increases.

  Furthermore, in order to reduce the distance d between the front and rear ends of the casing (1) described in Patent Document 1 and to reduce the size of the vehicle air conditioner, the header tanks (12) and (13) of the evaporator (4) and the heat Although it is also effective to reduce the width in the front-rear direction of the replacement core part (14), in this case, the leeward header parts (12a) (13a) and the upwind header parts (12b) of the header tanks (12) (13) ) (13b), the cross-sectional area of the heat exchange core part (14), the cross-sectional area of the refrigerant flow pipe part (15) (16) of the heat exchange core part (14) is reduced, the refrigerant side passage resistance is increased and the performance is reduced. .

JP 2000-335225 A

  An object of the present invention is to provide an evaporator capable of solving the above-described problems and reducing the size of the vehicle air conditioner in the front-rear direction to reduce the size, and a vehicle air conditioner using the evaporator.

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

1) a pair of header tanks that are spaced apart from each other with their longitudinal directions oriented in the same direction and that have a leeward header portion and a leeward header portion that is located on the leeward side of the leeward header portion; A plurality of leeward refrigerant distribution pipes provided between a pair of header tanks, both ends of which communicate with the leeward headers of both header tanks, and a plurality of windward refrigerant distribution pipes of which both ends communicate with the windward headers of both header tanks And a refrigerant inlet is provided in the leeward header portion of one header tank, and a refrigerant outlet is provided in the upwind header portion, and a refrigerant inlet pipe is connected to the refrigerant inlet. And an evaporator in which a refrigerant outlet pipe is connected to the refrigerant outlet, and a ventilation gap is formed between both refrigerant circulation pipe parts adjacent to each other in the ventilation direction.
The width of the heat exchange core portion in the ventilation direction is smaller than twice the outer diameter of the refrigerant outlet pipe, and the width of the header tank in the ventilation direction is larger than twice the outer diameter of the refrigerant outlet pipe. An evaporator in which the internal cross-sectional areas of the leeward header portion and the leeward header portion of the header tank are larger than the internal cross-sectional area of the refrigerant outlet pipe, respectively.

  2) The evaporator according to 1) above, wherein the width of the heat exchange core portion in the ventilation direction is 28 mm or less.

  3) The evaporator according to 1) or 2) above, wherein the width of the header tank in the ventilation direction is 32 mm or more.

4) A casing having an air inlet and an air outlet and having an air passage formed therein through the air inlet and the air outlet, and the temperature of the air provided in the casing and fed into the air passage Air is sent into the ventilation path of the casing through the temperature adjusting unit for adjusting, the evaporator arranged in the temperature adjusting unit, and the air inlet, and the air whose temperature is adjusted in the temperature adjusting unit is passed through the air outlet. An air conditioner for a vehicle including a blower that blows out into a room,
The evaporator of the temperature control unit is composed of the evaporator according to any one of the above 1) to 3), and the ventilation passage of the casing introduces air introduced into the ventilation passage from the air introduction port into the longitudinal direction of the header tank of the evaporator. The vehicle air conditioner which has the guide part sent to the front side of a heat exchange core part from the direction orthogonal to the longitudinal direction of a refrigerant | coolant circulation pipe part on the one side of a direction.

  5) The evaporator is disposed in the casing with the longitudinal direction of the header tank directed in the left-right direction and the refrigerant flow pipe portion directed in the up-down direction, and the guide portion of the ventilation path in the casing extends from the air inlet to the ventilation path. The vehicle air conditioner according to 4) above, wherein the air introduced into the interior is sent from either the left or right side to the front side of the heat exchange core section.

  6) The air heating section and a bypass section that bypasses the air heating section are provided behind the evaporator in the ventilation path in the casing, and the temperature adjustment section is arranged in the air heating section of the ventilation path in the casing. The vehicle according to the above 4) or 5), wherein the vehicle is provided with a heated heater core and an air mix damper that adjusts a ratio of an air amount sent to the heater core after passing through the evaporator and an air amount that bypasses the heater core after passing through the evaporator Air conditioner.

  According to the evaporators 1) to 3), the width of the heat exchange core portion in the ventilation direction is smaller than twice the outer diameter of the refrigerant outlet pipe. In this case, it is possible to avoid interference between the shielding portion of the air mix damper and the heat exchange core portion of the evaporator without shortening the length from the rotating shaft portion of the air mixing damper to the tip of the shielding portion. The opening area of the upstream end of the warm part and the detour part can be made larger than that of the vehicle air conditioner described in Patent Document 1. Moreover, the distance between the front and rear ends of the casing can be made smaller than the vehicle air conditioner described in Patent Document 1 without reducing the width in the front-rear direction of the guide portion in the ventilation path of the casing. Therefore, after suppressing the increase of the air side passage resistance when air flows through the air heating portion and the bypass portion of the ventilation path of the casing, and the air side passage resistance when air flows through the guide portion of the ventilation path, The distance between the front and rear ends of the vehicle can be reduced to reduce the size of the vehicle air conditioner.

  Further, according to the evaporators 1) to 3), the width of the header tank in the ventilation direction is larger than twice the outer diameter of the outlet pipe, and the inside of the leeward header portion and the upwind header portion of the header tank. Since the cross-sectional area is equal to or greater than the internal cross-sectional area of each outlet pipe, it is possible to suppress a decrease in the cross-sectional area of the leeward header portion and the leeward header portion of the header tank, and increase the refrigerant side passage resistance. Can be minimized.

  According to the evaporator of the above 2), the air side passage resistance when air flows through the air heating portion and the bypass portion of the ventilation path of the casing and the air side passage resistance when air flows through the guide portion of the ventilation path are increased. It is possible to reduce the distance between the front and rear ends of the casing and to reduce the size of the vehicle air conditioner.

  According to the evaporator of the above 3), it is possible to effectively suppress a reduction in the cross-sectional area of the leeward header portion and the leeward header portion of the header tank, and to minimize an increase in refrigerant side passage resistance. it can.

  According to the vehicle air conditioners of 4) to 6) above, the dimension from the rotating shaft portion of the air mix damper to the tip of the shielding portion is shortened, or the width in the front-rear direction of the guide portion of the ventilation path is reduced. In addition, the distance between the front and rear ends of the casing can be reduced. Therefore, after suppressing the increase of the air side passage resistance when air flows through the air heating portion and the bypass portion of the ventilation path of the casing, and the air side passage resistance when air flows through the guide portion of the ventilation path, The distance between the front and rear ends of the vehicle can be reduced to reduce the size of the vehicle air conditioner.

  In addition, it is possible to suppress a decrease in the cross-sectional area of the leeward header portion and the leeward header portion in the header tank of the evaporator, and the increase in the refrigerant side passage resistance can be minimized.

1 is a vertical sectional view schematically showing a vehicle air conditioner according to the present invention. It is a figure which expands and shows the part of the header tank of the evaporator in the vehicle air conditioner of FIG. It is a horizontal sectional view which shows the conventional vehicle air conditioner schematically. FIG. 4 is a vertical sectional view schematically showing the vehicle air conditioner of FIG. 3.

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

  In the following description, the term “aluminum” includes aluminum alloys in addition to pure aluminum.

  FIG. 1 schematically shows the overall configuration of a vehicle air conditioner using an evaporator according to the present invention. FIG. 2 shows the structure of the main part of the evaporator used in the vehicle air conditioner of FIG.

  In FIG. 1, the configuration of the vehicle air conditioner is the same as that of the vehicle air conditioner shown in FIGS. 3 and 4, except for the evaporator (20) disposed in the ventilation path (2) of the casing (1) and some dimensions. The configuration of the apparatus is the same. A horizontal sectional view schematically showing a vehicle air conditioner using the evaporator (20) according to the present invention is not shown, but is the same as FIG.

  The evaporator (20) is spaced apart from each other in the vertical direction with the longitudinal direction facing the left-right direction, and the windward side of the leeward header portions (21a) (22a) and the leeward header portions (21a) (22a) A pair of upper and lower aluminum header tanks (21), (22) having an upwind header section (21b, 22b) disposed in the heat exchanger core section provided between the header tanks (21, 22) (23).

  A refrigerant inlet (not shown) is provided at one end of the lee header portion (21a) of the upper header tank (21), and a refrigerant outlet (not shown) is provided at the same end as the refrigerant inlet in the upwind header portion (21b). The refrigerant inlet pipe (17) is connected to the refrigerant inlet, and the refrigerant outlet pipe (18) is connected to the refrigerant outlet.

  The heat exchange core part (23) is arranged with a space in the left-right direction with the width direction facing in the front-rear direction and the longitudinal direction facing in the up-down direction, and the upper and lower ends are both header tanks (21) (22) A plurality of aluminum leeward refrigerant flow pipe portions (24) communicating with the leeward header portions (21a) and (22a) of the leeward header portions (21a) and (22a) are spaced apart in the left-right direction with the width direction directed in the front-rear direction and the longitudinal direction directed in the up-down direction. And both upper and lower ends have a plurality of aluminum upwind refrigerant flow pipe sections (25) communicating with the upwind header sections (21b) and (22b) of both header tanks (21) and (22). A ventilation gap (26) is formed between the refrigerant flow pipe portions (24) and (25) adjacent in the left-right direction. Although not shown, aluminum corrugated fins are arranged in each ventilation gap (26) so as to straddle the leeward refrigerant circulation pipe part (24) and the windward refrigerant circulation pipe part (25).

The width B in the ventilation direction of the heat exchange core section (23) is smaller than twice the outer diameter A of the outlet pipe (18), and the width C in the ventilation direction of the header tanks (21) and (22) is It is larger than twice the outer diameter A of the pipe (18). In addition, the internal cross-sectional areas of the leeward header portions (21a) (22a) and the leeward header portions (21b) (22b) are equal to each other and larger than the internal cross-sectional area of the outlet pipe (18). ing. The width B in the ventilation direction of the heat exchange core portion (23) is preferably 28 mm or less. Moreover, it is preferable that the width | variety of the ventilation direction of a header tank (21) (22) is 32 mm or more. That is, the outer diameter of the outlet pipe (18) is Amm, the thickness of the outlet pipe (18) is tmm, the width in the ventilation direction of the heat exchange core (23) is Bmm, and the ventilation direction of the header tanks (21) and (22) 2A> B, C> 2A, D> {(A−, where Cmm is the width and Dmm ² is the internal cross-sectional area of the leeward header portions (21a) (22a) and the leeward header portions (21b) (22b) 2t) / 2} ² × π, B ≦ 28 mm, and C ≧ 32 mm.

  By satisfying the above-described conditions, the air mix damper (8) can be used without shortening the length L from the rotating shaft (8a) to the tip of the shielding part (8b) in the air mix damper (8) of the vehicle air conditioner. Between the heat shield core (23) of the evaporator (20) and the heat exchange core (23) of the evaporator (20), and the air heating part (9) and bypass part (11) of the ventilation path of the casing (1) An increase in air side passage resistance when air flows can be suppressed. Moreover, the distance D between the front and rear ends of the casing (1) can be reduced without reducing the width in the front-rear direction of the guide portion (6) in the ventilation path (2) of the casing (1). Therefore, the air-side passage resistance when air flows through the air heating section (9) and the bypass section (11) of the ventilation path (2) of the casing (1) and the guide portion (6) of the ventilation path (2) It is possible to reduce the distance D between the front and rear ends of the casing (1) and to reduce the size of the vehicle air conditioner while suppressing an increase in air-side passage resistance when air flows. In addition, it is possible to suppress a reduction in the cross-sectional area of the leeward header portions (21a) (22a) and the leeward header portions (21b) (22b) of the header tanks (21) and (22). The increase can be minimized.

  During operation of the vehicle air conditioner, the refrigerant that has passed through the compressor, the condenser, and the expansion valve flows in from the refrigerant inlet of the evaporator (20) and flows through all the refrigerant flow pipe sections (24) and (25) to exit the refrigerant. Spill from. On the other hand, the air sent into the ventilation path (2) of the casing (1) through the air inlet (1a) by the blower (5) is sent to the front side of the evaporator (20) through the guide portion (6), and the evaporator It passes through the ventilation gap (26) of the heat exchange core part (23) of (20) from the front end to the rear end. The refrigerant flowing in the leeward refrigerant circulation pipe (24) and the windward refrigerant circulation pipe (25) of the evaporator (20) and the air passing through the ventilation gap (26) of the heat exchange core (23) Exchanges heat, the air is cooled, and the refrigerant flows out as a gas phase.

  The cooled air passes through at least one of the air heating unit (9) and the detour unit (11), and the flow rate of air passing through the heater core (7) by the air mix damper (8) and the heater core ( The temperature is adjusted by adjusting the ratio with the flow rate of air that bypasses 7), and the air whose temperature has been adjusted is blown into the vehicle interior from the air outlet (1b).

  The vehicle air conditioner using the evaporator according to the present invention is suitably used as an air mix type vehicle air conditioner having an excellent function of adjusting the temperature of air blown into the passenger compartment.

(1): Casing
(1a): Air inlet
(2): Ventilation path
(3): Temperature control unit
(5): Blower
(6): Guidance part
(7): Heater core
(8): Air mix damper
(9): Air heating unit
(11): Detour section
(20): Evaporator
(21) (22): Header tank
(21a) (22a): leeward header
(21b) (22b): Upwind header
(23): Heat exchange core
(24): Downstream refrigerant distribution pipe
(25): Upwind refrigerant distribution pipe
(26): Ventilation gap

Claims (6)

A pair of header tanks that are spaced apart from each other with their longitudinal directions oriented in the same direction and that have a windward header portion disposed on the windward side of the leeward header portion and the leeward header portion; A plurality of leeward refrigerant circulation pipe portions provided between the header tanks, both ends of which communicate with the leeward header portions of both header tanks, and a plurality of windward refrigerant circulation pipe portions whose both ends communicate with the windward header portions of both header tanks. And a refrigerant inlet is provided in the leeward header portion of one header tank, and a refrigerant outlet is also provided in the upwind header portion, and a refrigerant inlet pipe is connected to the refrigerant inlet. And an evaporator in which a refrigerant outlet pipe is connected to the refrigerant outlet, and a ventilation gap is formed between the refrigerant circulation pipe parts adjacent to each other in the heat exchange core part.
The width of the heat exchange core portion in the ventilation direction is smaller than twice the outer diameter of the refrigerant outlet pipe, and the width of the header tank in the ventilation direction is larger than twice the outer diameter of the refrigerant outlet pipe. An evaporator in which the internal cross-sectional areas of the leeward header portion and the leeward header portion of the header tank are larger than the internal cross-sectional area of the refrigerant outlet pipe, respectively. The evaporator according to claim 1, wherein a width of the heat exchange core portion in the ventilation direction is 28 mm or less. The evaporator according to claim 1 or 2, wherein a width of the header tank in the ventilation direction is 32 mm or more. A casing having an air inlet and an air outlet and having a ventilation passage through which the air inlet and the air outlet are formed, and temperature adjustment of the air provided in the casing and fed into the ventilation passage The temperature control unit to be performed, the evaporator disposed in the temperature control unit, and air are fed into the ventilation passage of the casing through the air inlet, and the air whose temperature has been adjusted in the temperature control unit is fed into the vehicle interior through the air outlet. An air conditioner for a vehicle comprising a blower that blows out;
The evaporator of a temperature control part consists of an evaporator in any one of Claims 1-3, The ventilation direction of a casing is the longitudinal direction of the header tank of an evaporator for the air introduced in the ventilation path from the air inlet The vehicle air conditioner which has the guide part sent to the front side of a heat exchange core part from the direction orthogonal to the longitudinal direction of a refrigerant | coolant circulation pipe part on the one side of this. An evaporator is disposed in the casing with the longitudinal direction of the header tank directed in the left-right direction and the refrigerant flow pipe portion directed in the up-down direction, and the guide portion of the ventilation path in the casing extends from the air inlet to the ventilation path. The vehicle air conditioner according to claim 4, wherein the introduced air is sent from either the left or right side to the front side of the heat exchange core portion. An air heating unit and a detour unit that bypasses the air heating unit are provided behind the evaporator in the ventilation path in the casing, and the temperature adjustment unit is disposed in the air heating unit of the ventilation path in the casing. The vehicle air conditioner according to claim 4 or 5, further comprising: a heater core; and an air mix damper that adjusts a ratio of an amount of air sent to the heater core after passing through the evaporator and an amount of air that bypasses the heater core after passing through the evaporator. .

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