JP6166956B2 - Air conditioner for vehicles - Google Patents

Description

The present invention relates to a vehicle air conditioner.

  In this specification and claims, the front (left side of each figure) of the vehicle in which the vehicle air conditioner is used is referred to as the front, and the rear (right side of each figure) is referred to as the rear. (Up and down) is called up and down.

  For example, in a cab-over type light truck, a full-center vehicle air conditioner is used for the purpose of reducing the installation space. As shown in FIGS. 3 and 4, the vehicle air conditioner installed at the full center has an air inlet (1 a) and an air outlet (1 b), and an air inlet (1 a) and an air outlet ( 1b) a synthetic resin casing (1) in which a ventilation path (2) is formed, and temperature adjustment for adjusting the temperature of the air provided in the casing (1) and fed into the ventilation path (2) Part (3), an evaporator (4) arranged in the temperature control part (3), and air is sent into the ventilation path (2) of the casing (1) through the air inlet (1a) and the temperature control part ( 3) and a blower (5) that blows out the temperature-adjusted air through the air delivery port (1b) into the vehicle interior, and the temperature control unit (3) is connected to the ventilation path (2 in the casing (1)). ), The heater core (6) disposed downstream of the evaporator (4) in the air flow direction, and the heater core (4) after passing through the evaporator (4) Air conditioners for vehicles having an air mix damper (7) that adjusts the ratio of the amount of air sent to 6) and the amount of air that bypasses the heater core (6) after passing through the evaporator (4) are widely used. (For example, refer to Patent Document 1).

  In the vehicle air conditioner described in Patent Document 1, the air inlet (1a) is provided in the front side of the evaporator (4) in the upper wall portion of the casing (1), and the blower (5) is located above 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 portion (8) for sending the air introduced into the ventilation path (2) from the air inlet (1a) to the front portion of the evaporator (4) is provided in the front portion 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 (6) of the temperature adjusting unit (3) is disposed in the air heating unit (9) of the ventilation path (2) in the casing (1). The air mix damper (7) includes a rotating shaft portion (7a) and a shielding portion (7b) extending from the rotating shaft portion (7a) toward the evaporator (4) and rotating about the rotating shaft portion (7a). ), A first position (see the chain line in FIG. 4) for sending all the air that has passed through the evaporator (4) to the heater core (6) of the air heating unit (9), and the evaporator (4) The degree of opening of the shielding part (7b) is appropriately changed between the second position (see the solid line in FIG. 4) where all the air that has passed is sent to the bypass part (11) and the heater core (6) is bypassed. The ratio between the flow rate of air passing through the heater core (6) and the flow rate of air bypassing the heater core (6) 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 And a heat exchange core section (14) having a plurality of upwind refrigerant flow pipe sections (16) communicating with the upwind header sections (12b) and (13b) of (13) are widely used. The leeward header portion (12a) and the leeward header portion (12b) of the upper header tank (12) of the evaporator (4) are communicated with each other via a communication portion (19). In addition, a refrigerant inlet is provided at one end of the lee header section (13a) of the lower header tank (13), and a refrigerant outlet is provided at the same end as the refrigerant inlet in the upwind header section (13b). The refrigerant inlet pipe (17) is connected to the refrigerant inlet and the outlet pipe (18) is connected to the refrigerant outlet, and the refrigerant flow pipe parts (15) (16) adjacent in the left-right direction of the heat exchange core part (14) A ventilation gap having openings at the front and rear ends is formed between the two. The width in the ventilation direction of the heat exchange core (14) of the evaporator (4) is larger than twice the outer diameter of the refrigerant outlet pipe (18), and the width in the ventilation direction of both header tanks (12) (13) The width is larger than twice the outer diameter of the refrigerant outlet pipe (18). Further, the refrigerant inlet pipe (17) and the outlet pipe (18) extend outside through the wall of the casing (1).

  By the way, recently, for the purpose of securing a vehicle interior space, further downsizing of a vehicle air conditioner for a full center is required.

  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, in the guide portion (8) of the ventilation path (2) of the casing (1) One effective means is to reduce the size of the upstream end in the front-rear direction, but the width in the ventilation direction of the upper header tank (12) of the evaporator (4) can be reduced in the heat exchange core (14). Since it is larger than the width in the ventilation direction and twice the outer diameter of the refrigerant outlet pipe (18), it is possible to prevent an increase in air-side passage resistance when air flows in the guide portion (8). However, there is a limit to reducing the width in the front-rear direction of the upstream end of the guide portion (8), and as a result, the distance d between the front and rear ends of the casing (1) is also limited.

  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 It is also effective to reduce the width in the front-rear direction of the replacement core part (14), but in this case, the leeward header parts (12a) (13a) and the upwind header part (12b) of the header tanks (12) (13) As the cross-sectional area of (13b) becomes smaller, the cross-sectional area of the refrigerant flow pipe parts (15) and (16) of the heat exchange core part (14) becomes smaller, the refrigerant-side passage resistance becomes larger, and the performance deteriorates.

Japanese Patent No. 4075169

An object of the present invention is to provide a vehicle air conditioner that solves the above problems and that can be reduced in size by reducing the size in the front-rear direction.

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

1) A casing having an air inlet and an air outlet and having an air passage formed through the air inlet and the air outlet, and a temperature of 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 blower that blows out into the room, and is provided with an air inlet opening obliquely upward at the front side of the evaporator in the upper wall portion of the casing, and on the front side of the evaporator in the ventilation path in the casing by the blower. Guide part that guides the air fed into the ventilation path through the air inlet to the front side of the heat exchange core part of the evaporator Provided,
A pair of upper and lower pairs of evaporators of the temperature control unit are arranged at intervals with the longitudinal direction facing the same direction, and have an upwind header unit and an upwind header unit arranged on the upwind side of the downwind header unit A plurality of leeward refrigerant circulation pipes provided between the header tank and both header tanks, both ends of which communicate with the leeward header portions of both header tanks, and a plurality of windward refrigerants whose both ends communicate with the windward header portions of both header tanks. A heat exchange core portion having a flow pipe portion, a refrigerant inlet is provided in the lee header portion of the first header tank, and a refrigerant outlet is also provided in the upwind header portion, and the refrigerant inlet is provided in the refrigerant inlet. tube refrigerant outlet pipe is connected to the refrigerant outlet together are connected, car air gap ventilating direction opposite open ends between the refrigerant flow tube portions to each other adjacent the heat exchange core portion is formed A use air-conditioning system,
The width in the ventilation direction of the heat exchange core portion of the evaporator is smaller than twice the outer diameter of the refrigerant outlet pipe, and the width in the ventilation direction of the header tank located on the upper side of both header tanks is equal to that of the refrigerant outlet pipe. It is smaller than twice the outer diameter, is larger than the width in the ventilation direction of the heat exchange core, and the width in the ventilation direction of the header tank located on the lower side is equal to the outer diameter of the refrigerant outlet pipe. It is larger than twice the size, so that the width in the ventilation direction of the header tank located on the upper side of both header tanks is narrower than the width in the ventilation direction of the header tank located on the lower side. The refrigerant flowing into the lee header portion of the first header tank from the refrigerant inlet is the leeward refrigerant flow tube portion, the lee header portion and the windward header portion of the second header tank, the windward refrigerant flow tube portion, and the first header. Upwind of the tank Air conditioning system is adapted to flow out from the refrigerant outlet via the reader unit.

2) the evaporator, the 1 first header tank are disposed in the temperature regulation portion of the casing to come lower) air-conditioning system according.

3) The vehicle according to the above 1) or 2), wherein the width of the header tank located on the upper side of both the header tanks of the evaporator is 1 to 2 mm larger than the width of the heat exchange core section in the ventilation direction . Air conditioner .

4) The vehicle air conditioner according to any one of 1) to 3) above, wherein a width in a ventilation direction of the heat exchange core portion of the evaporator is 28 mm or less.

5) An air heating unit and a bypass 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 arranged in the air heating unit of the ventilation path in the casing. Of the above 1) to 4), and an air mix damper that adjusts the ratio of the amount of air sent to the heater core after passing through the evaporator and the amount of air that bypasses the heater core after passing through the evaporator The vehicle air conditioner according to any one of the above.

According to the vehicle air conditioners 1) to 5) above, the width of the evaporator heat exchange core portion in the ventilation direction is smaller than twice the outer diameter of the refrigerant outlet pipe, and the upper side of both header tanks The width of the header tank located in the ventilation direction is smaller than twice the outer diameter of the refrigerant outlet pipe and larger than the width of the heat exchange core portion in the ventilation direction, and is also located on the lower side. The width of the tank in the ventilation direction is larger than twice the outer diameter of the refrigerant outlet pipe, so that the width in the ventilation direction of the header tank located on the upper side of both header tanks is located on the lower side. since being made and narrower than the ventilation direction of the width of the header tank, without reducing the longitudinal dimension of the upstream end of the guide portion in the air passage of the casings, to reduce the distance between the front and rear ends of the casing Can be . Therefore, it is possible to reduce the distance between the front and rear ends of the casing and reduce the size of the vehicle air conditioner while suppressing an increase in air-side passage resistance when air flows through the guide portion of the ventilation path in the casing. It becomes possible.

Furthermore, according to the vehicle air conditioners of 1) to 5) above, the width in the ventilation direction of the header tank located below the evaporator is larger than twice the outer diameter of the refrigerant outlet pipe. The refrigerant flowing into the leeward header portion of the first header tank from the refrigerant inlet is the leeward refrigerant circulation pipe portion, the leeward header portion and the windward header portion of the second header tank, the windward refrigerant circulation pipe portion, and the first header tank. Since the width of the heat exchange core part of the evaporator in the ventilation direction is smaller than twice the outer diameter of the refrigerant outlet pipe, both header tanks Even if the width in the ventilation direction of the header tank located on the upper side is smaller than twice the outer diameter of the refrigerant outlet pipe, the increase in the refrigerant side passage resistance of the evaporator can be minimized. it can.

According to the vehicle air conditioner of 2) above, the refrigerant inlet is provided at one end of the leeward header portion of the evaporator, and the refrigerant outlet is provided at the same end as the refrigerant inlet in the upwind header portion, and Since the width in the ventilation direction of the first header tank disposed on the lower side is larger than twice the outer diameter of the refrigerant outlet pipe, the internal cross-sectional area of the leeward header portion and the windward header portion of the first header tank Is relatively large. Therefore, an increase in the refrigerant side passage resistance of the evaporator can be suppressed. In particular, the effect of suppressing the increase in the refrigerant side passage resistance is remarkable in the upwind header portion where the refrigerant outlet is provided.

According to the vehicle air conditioner of 3) and 4) above, the distance between the front and rear ends of the casing can be effectively reduced without reducing the longitudinal dimension of the upstream end of the guide portion in the ventilation passage of the casing. Is possible.

According to the vehicle air conditioner of 5), it is possible to reduce the distance between the front and rear ends of the casing without reducing the size in the front-rear direction of the upstream end of the guide portion in the ventilation passage of the casing. Therefore, it is possible to reduce the distance between the front and rear ends of the casing and reduce the size of the vehicle air conditioner while suppressing an increase in air-side passage resistance when air flows through the guide portion of the ventilation path in the casing. It becomes possible.

  In addition, the distance between the front and rear ends of the casing can be reduced to reduce the size of the vehicle air conditioner, and the increase in refrigerant side passage resistance can be minimized.

The vehicle air conditioning apparatus according to the present invention is a vertical sectional view schematically showing. It is the enlarged view which abbreviate | omitted one part which shows the principal part of the vehicle air conditioner of FIG. It is a vertical sectional view schematically showing a conventional vehicle air conditioner. It is the enlarged view which abbreviate | omitted a part which shows the principal part of the vehicle air conditioner of FIG.

  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. In the following description, the left and right sides of the vehicle, that is, the left and right when looking forward from the rear are referred to as left and right.

FIG. 1 schematically shows a vehicle air conditioner according to the present invention, and FIG. 2 shows a configuration of a main part of the vehicle air conditioner shown in 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.

  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).

  The leeward header portion (21a) and the leeward header portion (21b) of the upper header tank (21) communicate with each other via a communication portion (24). A refrigerant inlet (not shown) is provided at one end of the lee header portion (22a) of the lower header tank (22), and a refrigerant outlet (not shown) is also provided at the same end as the refrigerant inlet in the upwind header portion (22b). 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 (25) 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 circulation pipe portions (26) communicating with the upwind header portions (21b) (22b) of both header tanks (21) (22). A ventilation gap (27) is formed between the refrigerant flow pipe portions (25) and (26) adjacent in the left-right direction. Although not shown, aluminum corrugated fins are arranged in each ventilation gap so as to straddle the leeward refrigerant circulation pipe part and the windward refrigerant circulation pipe part.

  Therefore, the refrigerant that has flowed from the refrigerant inlet pipe (17) through the refrigerant inlet into the lee header section (22a) of the lower header tank (22) passes through the leeward refrigerant circulation pipe section (25) and passes through the upper header tank ( After entering the leeward header part (21a) of 21), it enters the upwind header part (21b) through the communication part (24), and then passes through the downwind refrigerant circulation pipe part (25) to the lower header. After entering the windward header portion (22b) of the tank (22), it flows out to the refrigerant outlet pipe (18) through the refrigerant outlet.

The width of the heat exchange core section (23) in the ventilation direction is smaller than twice the outer diameter of the outlet pipe (18), and the width of the upper header tank (21) in the ventilation direction of the outlet pipe (18) It is smaller than twice the outer diameter and larger than the width of the heat exchange core portion (23) in the ventilation direction. The width of the lower header tank (22) in the ventilation direction is larger than twice the outer diameter of the outlet pipe (18). As a result, the width of the upper header tank (21) in the ventilation direction is narrower than the width of the lower header tank (22) in the ventilation direction .

  Here, it is preferable that the width | variety of the ventilation direction of a heat exchange core part (23) is 28 mm or less. Moreover, it is preferable that the width | variety of the ventilation direction of an upper header tank (21) is 1-2 mm larger than the width | variety of the ventilation direction of the heat exchange core part (23).

  By satisfying the above-described conditions, the distance D between the front and rear ends of the casing (1) can be reduced without reducing the longitudinal dimension of the upstream end of the guide portion (8) in the ventilation path (2) in the casing (1). Can be made smaller than the distance d between the front and rear Tankan of the casing (1) of the vehicle air conditioner shown in FIG. Therefore, the distance D between the front and rear ends of the casing (1) is reduced while suppressing an increase in air-side passage resistance when air flows through the guide portion (8) of the ventilation path (2) of the casing (1). This makes it possible to reduce the size of the vehicle air conditioner. Moreover, the width of the lower header tank (22) in the ventilation direction is larger than twice the outer diameter of the refrigerant outlet pipe (18), and the lower side through the refrigerant inlet from the medium inlet pipe (17). After the refrigerant flowing into the lee header part (22a) of the header tank (22) passes through the leeward refrigerant circulation pipe part (25) and enters the lee header part (21a) of the upper header tank (21), Passes through the communication part (24) into the windward header part (21b), then passes through the windward refrigerant flow pipe part (25) and enters the windward header part (22b) of the lower header tank (22). After that, it flows out to the refrigerant outlet pipe (18) through the refrigerant outlet, so that the width of the heat exchange core (23) in the ventilation direction is twice the outer diameter of the refrigerant outlet pipe (18). The width in the ventilation direction of the header tank (21) located above the header tank (21) (22) is smaller by 1 to 2 mm than the width in the ventilation direction of the heat exchange core (23). Even if it was The increase of the refrigerant flow resistance 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 (25) and (26) 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 (8), and the evaporator It passes through the ventilation gap 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 (25) and the windward refrigerant circulation pipe (25) of the evaporator (20) and the air passing through the ventilation gap (27) 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 (6) by the air mix damper (7) and the heater core ( By adjusting the ratio of the air flow rate that bypasses 6), the temperature blown into the passenger compartment is adjusted.

Vehicle air-conditioning apparatus according to the present invention, in order to reduce the size of the installation space, is suitably used as a vehicle air conditioner of every full center of pickup truck cab-over type.

(1) Casing
(1a): Introduction port
(1b): Outlet
(2): Ventilation path
(3): Temperature control unit
(5): Blower
(6): Heater core
(7): Air mix damper
(8): Guidance part
(9): Heating part
(11): Detour section
(20): Evaporator
(21): Upper header tank
(21a): Downward header
(21b): Windward header
(22): Lower header tank
(22a): Downstream header
(22b): Upwind header
(23): Heat exchange core
(24): Communication part
(25): Downstream refrigerant distribution pipe
(26): Windward side refrigerant distribution pipe
(27): Ventilation gap

Claims (5)

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. A blower that blows out, and an air introduction port that opens obliquely upward and forward is provided in the front side of the evaporator in the upper wall portion of the casing, and air is introduced by the blower in front of the evaporator in the ventilation path in the casing. There is a guide part that guides the air sent into the ventilation path through the mouth to the front side of the heat exchange core part of the evaporator. Vignetting and,
A pair of upper and lower pairs of evaporators of the temperature control unit are arranged at intervals with the longitudinal direction facing the same direction, and have an upwind header unit and an upwind header unit arranged on the upwind side of the downwind header unit A plurality of leeward refrigerant circulation pipes provided between the header tank and both header tanks, both ends of which communicate with the leeward header portions of both header tanks, and a plurality of windward refrigerants whose both ends communicate with the windward header portions of both header tanks. A heat exchange core portion having a flow pipe portion, a refrigerant inlet is provided in the lee header portion of the first header tank, and a refrigerant outlet is also provided in the upwind header portion, and the refrigerant inlet is provided in the refrigerant inlet. tube refrigerant outlet pipe is connected to the refrigerant outlet together are connected, car air gap ventilating direction opposite open ends between the refrigerant flow tube portions to each other adjacent the heat exchange core portion is formed A use air-conditioning system,
The width in the ventilation direction of the heat exchange core portion of the evaporator is smaller than twice the outer diameter of the refrigerant outlet pipe, and the width in the ventilation direction of the header tank located on the upper side of both header tanks is equal to that of the refrigerant outlet pipe. It is smaller than twice the outer diameter, is larger than the width in the ventilation direction of the heat exchange core, and the width in the ventilation direction of the header tank located on the lower side is equal to the outer diameter of the refrigerant outlet pipe. It is larger than twice the size, so that the width in the ventilation direction of the header tank located on the upper side of both header tanks is narrower than the width in the ventilation direction of the header tank located on the lower side. The refrigerant flowing into the lee header portion of the first header tank from the refrigerant inlet is the leeward refrigerant flow tube portion, the lee header portion and the windward header portion of the second header tank, the windward refrigerant flow tube portion, and the first header. Upwind of the tank Air conditioning system is adapted to flow out from the refrigerant outlet via the reader unit. Evaporator, the first header tank vehicular air conditioning apparatus according to claim 1, wherein arranged in the temperature adjustment portion of the casing to come lower. The vehicle air conditioner according to claim 1 or 2, wherein a width of the header tank located on the upper side of both the header tanks of the evaporator is 1-2 mm larger than a width of the heat exchange core portion in the ventilation direction. The vehicle air conditioner according to any one of claims 1 to 3, wherein a width of the heat exchange core portion of the evaporator in the ventilation direction is 28 mm or less. 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. 5. The apparatus according to claim 1, 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. The vehicle air conditioner described.

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