JP2007314056A - Air conditioner for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the reduction of blow-out air quantity when introducing primary air into an aspirator. <P>SOLUTION: This aspirator 39 is provided in the vicinity of an air mix chamber 32 of an air conditioning unit case 20. When air-conditioned air flows into a venturi tube 40 and is blown from a diffuser 40b, internal air is sucked into an outlet of a secondary air suction nozzle 41 via a hose 43 communicated with a storing case 37 of an internal air temperature sensor 36 by a venturi effect. Air discharged from the diffuser 40b is returned to a suction port 26a of an air blower 25 without leakage by a connection pipe 44. As a result the reduction of air quantity blown into a cabin from blow-off ports 33a to 33c can be prevented. The primary air is heat-exchanged air-conditioned air, and thereby cooling and heating performance in the air conditioning unit case 20 can be assisted by blowing the primary air by the air blower. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle air conditioner including an aspirator for introducing inside air (vehicle interior air) around an inside air temperature sensor that detects an inside air temperature (vehicle interior temperature).

Conventionally, as this kind of aspirator in a vehicle air conditioner, a part of the conditioned air pumped by a blower is introduced into the diffuser part as primary air, and the pressure in the diffuser part is reduced, so that this diffuser part In some cases, the inside air in the vicinity of the instrument panel in the front part of the vehicle interior passes through the inside air temperature sensor and sucks it as secondary air. At this time, the air discharged from the diffuser part was discharged out of the air conditioning case (for example, refer to Patent Document 1).
JP 2004-58775 A

  However, since a part of the conditioned air is introduced into the aspirator as the primary air from the air conditioning case and is discharged as it is outside the air conditioning case, there is a problem that the amount of air blown to the air outlet in the vehicle interior in the air conditioning case is reduced.

  In view of the above points, an object of the present invention is to prevent a reduction in the amount of blown air when introducing primary air to an aspirator.

  In order to achieve the above object, the present invention provides an air conditioning unit case (20) that constitutes an air passage provided with outlets (33a, 33b, 33c) for blowing air into the passenger compartment at the downstream end, and an air conditioning unit case (20 ), And a portion between the blower (25) of the air conditioning unit case (20) and the outlet (33a, 33b, 33c). The primary air inlet (42) provided to open to the air passage, the diffuser part (40b), and the arrangement space (37) of the inside air temperature sensor (36) for detecting the air temperature in the passenger compartment are connected in communication. Secondary air inlet (41), and the vehicle is discharged from the secondary air inlet (41) by discharging the primary air from the primary air inlet (42) from the diffuser part (40b). The aspirator (39) that sucks the internal air and discharges it from the diffuser part (40b) together with the primary air, one end is connected to the diffuser part (40b), and the other end is opened near the suction port (26a) of the blower (25) The connecting pipe (44) guides the air discharged from the diffuser part (40b) to the suction port (26a).

  Thereby, the primary air discharged from the air-conditioning unit case (20) to the diffuser part (40b) through the primary air inlet (42), together with the secondary air sucked from the surrounding air temperature sensor (36), The diffuser portion (40b) and the suction port (26a) of the blower (25) can be returned to the blower suction port (26a) by the connection pipe (44) that communicates and connects them. Thereby, the fall of the amount of blowing air to the vehicle interior in the air conditioning unit case (20) can be prevented.

  The primary air inlet (42) of the aspirator (39) can be disposed downstream of the heat exchangers (28, 29) included in the air conditioning unit case (20). As a result, the air returned to the blower inlet (26a) by the connection pipe (44) is conditioned air heat-exchanged by the heat exchanger (28, 29), and thus prevents a reduction in the amount of air blown into the vehicle interior. In addition, the heat exchange performance in the heat exchanger (28, 29) can be assisted.

  The heat exchanger can be at least one of a cooling and heating heat exchanger (28, 29). In response, the primary air inlet (42) is connected to the cooling heat exchanger (28). ) And at least one of the heating heat exchanger (29).

  When the air conditioning unit case (20) includes both the cooling and heating heat exchangers (28, 29) as heat exchangers, the primary air inlet (42) is connected to both the heat exchangers (28, 29). ) Is arranged so as to open to the air mix chamber (32) on the downstream side of the cooling air and the warm air as the primary air in the cooling and heating modes, respectively, to the blower inlet (26a). Can assist in cooling and heating performance.

  Further, if the other end of the connection pipe (44) is arranged so as to open between the suction port (26a) of the blower and the inside / outside air switching door (23a) of the inside / outside air switching box (23), the blower (25 ) Can always suck the return air from the diffuser section (40b) regardless of the position of the inside / outside air switching door (23a).

  In addition, by connecting one end side of the connecting pipe (44) to the diffuser part (40b) as a straight pipe and arranging the axial centers of both on the same straight line, the ventilation resistance at the connecting part can be reduced. It is possible to prevent a decrease in the amount of air discharged from the diffuser section (40b). Accordingly, it is possible to prevent a reduction in the amount of secondary air sucked by the aspirator (39) and to secure the air volume of the inside air that passes around the inside air temperature sensor (36), and thus the inside air temperature sensor (36). It is possible to prevent a decrease in detection accuracy.

  In this case, the ventilation resistance of the connection pipe (44) can be further reduced by using a straight pipe as a whole from one end to the other end of the connection pipe (44).

  In addition, the code | symbol in the bracket | parenthesis of each means described in a claim and this column shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of the entire vehicle air conditioner of the present embodiment.

  On the upstream side of the air conditioning unit case 20, an outside air inlet 21 that sucks air outside the vehicle compartment (outside air) and an inside air inlet port 22 that sucks air inside the vehicle compartment (inside air) are provided. An inside / outside air switching door 23 a is provided at an intermediate portion between the outside air inlet 21 and the inside air inlet 22, and the opening ratio of the inside / outside air switching door 23 a is adjusted by the servo motor 24, thereby changing the introduction ratio of the inside / outside air. It is supposed to switch. The outside air inlet 21, the inside air inlet 22, and the inside / outside air switching door 23a are housed in an inside / outside air switching box 23.

  A return opening 45 is provided on the downstream side wall surface of the inside / outside air switching door 23a of the inside / outside air switching box 23, and the other end of a connecting pipe 44 described later is connected thereto.

  A blower 25 is provided on the downstream side of the inside / outside air switching door 23a. The blower 25 is accommodated in the blower unit 26, sucks air introduced into the inside / outside air switching box 23 from the suction port 26 a on the upstream side of the blower unit 26, and blows it to the connection duct 27 on the downstream side of the air conditioning unit case 20.

  On the downstream side of the connection duct 27, that is, on the downstream side of the blower 25, an evaporator 28 is disposed as a cooling heat exchanger for a refrigeration cycle that cools and dehumidifies intake air. Further, on the downstream side of the evaporator 28, a heater core 29 and an air mix damper 30 as a heat exchanger for heating through which engine cooling hot water circulates are provided, and the opening degree of the air mix damper 30 is adjusted by a servo motor 31. Thus, the blowing temperature is adjusted by changing the mixing ratio of the wind passing through the heater core 29 and the wind passing through the heater core 29 in the air mix chamber 32.

  The conditioned air whose temperature has been adjusted in this way is switched between a DEF outlet 33a, a FACE outlet 33b, and a FOOT outlet 33c by switching an outlet mode damper (not shown) provided downstream of the air mix chamber 32. It is blown out into the passenger compartment from the outlet.

  The operation of actuators such as the motor of the blower 25, the servo motor 31 that drives the air mix damper 30, and the servo motor (not shown) that drives the blowout mode damper are operated in a well-known manner by the air conditioning control circuit 56. Controlled. That is, the air-conditioning control circuit 56 is constituted by, for example, a microcomputer, the inside air temperature Tr detected by the inside air temperature sensor 36, the outside air temperature Tam detected by the outside air temperature sensor 57, and the solar radiation intensity Ts detected by the solar radiation sensor 58, The set temperature Tset set by the temperature setter 59 is read, and the target blowing temperature TAO is calculated based on these data. The air conditioning control circuit 56 determines the control amounts of the actuator based on the TAO, and controls the actuators based on the control amounts.

  On the other hand, an inside air temperature sensor 36 for detecting the temperature of the air (inside air) in the passenger compartment is installed inside the instrument panel 35. The inside air temperature sensor 36 is housed in a sensor housing case 37 that is an arrangement space, and air in the vehicle compartment is introduced into the sensor housing case 37 through a vent hole 38 of the instrument panel 35. The introduction of air into the sensor storage case 37 is caused by an aspirator 39 provided to open to the air mix chamber 32 on the downstream side of the heater core 29 that is a heat exchanger for heating.

  As shown in FIG. 2, the aspirator 39 includes a venturi pipe 40 that forms a primary air passage, and a secondary air intake nozzle 41 that forms a secondary air inlet. The tip of the secondary air suction nozzle 41 protrudes into the large-diameter tube portion 40a on the upstream side of the venturi tube 40 so as to face the inlet of the diffuser portion 40b on the downstream side of the venturi tube 40, and the diffuser portion 40b. And the axis of the secondary air suction nozzle 41 are configured to be in the same straight line.

  The upstream large-diameter pipe portion 40a of the venturi pipe 37 is connected to a primary air introduction port 42 formed in the air conditioning unit case 20, and a part of the wind flowing through the air passage in the air conditioning unit case 20 is introduced into the primary air. The vent 42 is introduced into the venturi tube 40 from the mouth 42.

  A venturi effect is produced in the vicinity of the tip of the secondary air suction nozzle 41 by the air discharged from the primary air inlet 42 through the venturi pipe 40 and discharged from the diffuser portion 40b. A negative pressure is applied to cause the secondary air suction nozzle 41 to generate an air suction action.

  By connecting the secondary air suction nozzle 41 and the sensor storage case 37 of the inside air temperature sensor 36 with a hose 43, the air in the vehicle interior as the secondary air is converted into the sensor storage case 37 → the hose 43 → second. The air is sucked through the route of the next air suction nozzle 41 → the venturi tube 40.

  Furthermore, the opening of the diffuser part 40b, which is the discharge port of the aspirator 39, is connected to a straight pipe-shaped connecting pipe 44. At this time, the axial center of the diffuser part 40b and the axial center of the connecting pipe 44 are arranged on the same straight line. Thereby, since the primary air and secondary air which are discharged from the diffuser part 40b can flow along the axial center on the same straight line, the ventilation resistance of this flow can be made small.

  On the other hand, the other end of the straight pipe of the connection pipe 44 is connected to communicate with a return opening 45 provided on the wall surface of the inside / outside air switching box 23. Thereby, the discharge air from the aspirator 39 discharged from the diffuser part 40b can be returned to the suction port 26a of the blower 25 without leakage.

  As described above, the primary air discharged from the air conditioning unit case 20 to the diffuser portion 40b introduced through the primary air inlet 42, together with the secondary air sucked from the surrounding air temperature sensor 36, It can return to the air blower inlet 26a by the connection pipe 44 which connects the air intake 26a of the air blower 25 in communication. Thereby, the fall of the amount of blowing air to the vehicle interior in the air conditioning unit case 20 can be prevented.

  Further, the primary air returned from the aspirator 39 to the blower 25 is conditioned air discharged from the air mix chamber 32 to the aspirator 39 through the primary air inlet 40, that is, conditioned air that has passed through the heat exchangers 28 and 29. Therefore, the air blower 25 blows out the returned primary air to the heat exchangers 28 and 29 in the air conditioning unit case 20, thereby assisting the cooling and heating capability.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 3 is a view showing the appearance of the vehicle air conditioner of the second embodiment, and FIG. 4 is a cross-sectional view taken along the arrow in FIG. 3 and 4, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 3 shows an inside / outside air switching box 23, a blower unit 26, a connection duct 27 and a heater unit 29 a provided in the air conditioning unit case 20, an aspirator 39 and a connection pipe 44.

  In the air conditioning unit case 20 of the second embodiment, the inside / outside air introduced from the inside / outside air switching box 23 is blown to the downstream connection duct 27 by the blower in the blower unit 26, and further, the downstream side of the connection duct 27 is bent. It is sent to an evaporator (not shown in FIG. 3) 28 and a heater core 29 arranged in the air passage.

  As shown in FIG. 4, an air mix chamber 32 is formed in the heater unit 29 a on the downstream side of the evaporator 28 and the heater core 29. In the air mix chamber 32, the cold air that has passed through the evaporator 28 and the heater core 29 are passed. The warm air thus mixed is mixed at a mixing ratio corresponding to the opening degree of the air mix damper 30.

  The aspirator 39 of the second embodiment is provided on the wall surface of the heater unit 29a, and introduces primary air from the air mix chamber 32 in the heater unit 29a through the primary air inlet 42 as in the first embodiment. .

  Further, the connection pipe 44 whose one end side is connected to the diffuser portion 40b of the aspirator 39 is connected to the return opening 45 provided on the wall surface of the inside / outside air switching box 23 at the other end side, similarly to the first embodiment. The connecting pipe 44 is arranged so that the axial centers of the connecting pipe 44 and the diffuser portion 40b are on the same straight line. Thereby, the ventilation resistance of the air discharged from the diffuser part 40b can be made small.

  The connecting pipe 44 is formed to be bent in the middle depending on the positional relationship with the inside / outside air switching box 23. Thereby, the aspirator 39 and the inside / outside air switching box 23 can be connected by the connection pipe 44 having a short pipe length, and an increase in ventilation resistance in the connection pipe 44 is suppressed.

  Also in the second embodiment, similarly to the first embodiment, by returning the discharge air of the aspirator 39 to the suction port 26a of the blower 25, it is possible to prevent a decrease in the amount of air blown into the vehicle interior and to improve the cooling and heating performance. Assistance can be performed. Further, by reducing the ventilation resistance of the connection pipe 44, it is possible to prevent a decrease in the internal air flow rate as secondary air passing around the internal air temperature sensor 36, and to ensure the detection accuracy of the internal air temperature sensor.

It is a figure which shows schematic structure of the vehicle air conditioner of 1st Embodiment. It is sectional drawing of an aspirator. It is a figure which shows the external appearance of the vehicle air conditioner of 2nd Embodiment. It is arrow sectional drawing in FIG.

Explanation of symbols

20 ... Air conditioning unit case, 23 ... Inside / outside air switching box, 25 ... Blower,
28 ... Evaporator (cooling heat exchanger), 29 ... Heater core (heating heat exchanger),
32 ... Air mix chamber, 36 ... Inside temperature sensor, 39 ... Aspirator,
40 ... Venturi tube, 40b ... diffuser section, 41 ... secondary air suction nozzle,
42 ... primary air inlet, 43 ... hose, 44 ... connecting pipe, 45 ... return opening.

Claims (7)

An air conditioning unit case (20) constituting an air passage provided with outlets (33a, 33b, 33c) for blowing air into the passenger compartment at the downstream end;
A blower (25) that is arranged upstream of the air conditioning unit case (20) and blows air into the air conditioning unit case (20);
A primary air inlet (42) provided to open to the air passage at a portion between the blower (25) and the blower outlets (33a, 33b, 33c) of the air conditioning unit case (20), and a diffuser portion (40b) and a secondary air inlet (41) connected in communication with an arrangement space (37) of the inside air temperature sensor (36) for detecting the air temperature in the passenger compartment, the primary air inlet (42 ) Is discharged from the diffuser part (40b) to suck the vehicle interior air from the secondary air inlet (41) and discharge it from the diffuser part (40b) together with the primary air. 39),
One end is connected to the diffuser part (40b), and the other end is opened in the vicinity of the suction port (26a) of the blower (25), and the air discharged from the diffuser part (40b) is sent to the suction port (26a). And a connection pipe (44) leading to the vehicle. The air conditioning unit case (20) includes a heat exchanger (28, 29) on the downstream side of the blower (25), and the primary air inlet (42) is on the downstream side of the heat exchanger (28, 29). The vehicle air conditioner according to claim 1, wherein the vehicle air conditioner is disposed in the vehicle. The vehicle air conditioner according to claim 2, wherein the heat exchanger is at least one of a cooling heat exchanger (28) and a heating heat exchanger (29). The heat exchangers are the cooling heat exchanger (28) and the heating heat exchanger (29), and the air conditioning unit case (20) is the cooling and heating heat exchanger (28, 29). An air mix chamber (32) is provided on the downstream side,
The vehicle air conditioner according to claim 2, wherein the primary air introduction port (42) is provided so as to open to the air mix chamber (32). The air conditioning unit case (20) includes an inside / outside air switching box (23) that switches between introduction of inside air and outside air by an inside / outside air switching door (23a) on the upstream side of the blower (25),
The other end of the connecting pipe (44) opens between the inside / outside air switching door (23a) and the air inlet (26a) of the blower. The vehicle air conditioner described in 1. The one end side of the connecting pipe (44) is provided with a straight pipe part, and the axial center of the straight pipe part is arranged on the same straight line as the axial center of the diffuser part (40b). The vehicle air conditioner as described in any one of thru | or 5. A straight pipe part is provided from one end side to the other end side of the connection pipe (44), and the axial center of the straight pipe part is arranged on the same straight line as the axial center of the diffuser part (40b). The vehicle air conditioner according to claim 6.

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