WO2023182147A1

WO2023182147A1 - Vehicle air conditioning unit

Info

Publication number: WO2023182147A1
Application number: PCT/JP2023/010337
Authority: WO
Inventors: 良徳戸高; 幸央鈴木
Original assignee: 株式会社ヴァレオジャパン
Priority date: 2022-03-22
Filing date: 2023-03-16
Publication date: 2023-09-28
Also published as: JP2023139394A

Abstract

[Problem] To provide a vehicle air conditioning unit having improved comfort. [Solution] In a vehicle air conditioning unit (20), an auxiliary adjusting unit (65) capable of adjusting a flow rate of blown air by regulating a flow passage area of a lower cold air bypass (By2) is formed on a rotating shaft portion (61) of a lower mix door (60). The auxiliary adjusting unit (65) reduces a flow passage cross-sectional area of the lower cold air bypass (By2) when blown air that has passed through a lower portion of a heater (33) and blown air that has passed through the lower cold air bypass (By2) both flow toward a rear opening portion (44). Preferably, a center vent opening portion (43) is provided on a downstream side of a side vent opening portion (42) as seen along a flow direction of lower conditioned air.

Description

Vehicle air conditioning unit

The present invention relates to a vehicle air conditioning unit that has a vent opening for blowing air toward the upper body of a front seat occupant and a rear opening for blowing air toward a rear seat occupant.

Many vehicles are equipped with a vehicle air conditioning unit to adjust the temperature inside the vehicle. Some vehicle air conditioning units have a vent opening for blowing air toward the upper body of a front seat occupant and a rear opening for blowing air toward a rear seat occupant. BACKGROUND ART As a conventional technology related to a vehicle air conditioning unit, there is a technology disclosed in Patent Document 1.

Patent Document 1 discloses that vent air ports that blow air toward the upper body of front seat occupants are formed at the center of the vehicle width and at the ends of the vehicle width, and that there is a register that can adjust the amount of air blown to the rear seat area. It is disclosed that the (rear seat ventilation switching section) is provided at a rear ventilation opening that blows air toward rear seat occupants.

Japanese Patent Application Publication No. 2006-298149

As a result of research conducted by the present inventors, it was found that the following problems occur with some vehicle air conditioning units that have a plurality of vent openings at different positions and also have a rear opening. Problems with such a vehicle air conditioning unit will be explained with reference to the drawings.

Refer to Figure 7. FIG. 7 shows a vehicle air conditioning unit 120 according to a comparative example. The vehicle air conditioning unit 120 includes a case 140 through which blown air flows from the front to the rear (from the left to the right in the drawing), an evaporator 132 provided inside the case 140 and capable of cooling the blown air, and this evaporator. A heater 133 that can heat the blown air that has passed through the evaporator 132 and a heater 133 that can be slid up and down in the front upper part of the heater 133 and can adjust the ratio of the amount of air that passes through the upper part of the heater 133 out of the air that passes through the evaporator 132. an upper mix door 150, and a lower mix door 160 which is provided in the front lower part of the heater 133 so as to be slidable up and down and can adjust the ratio of the amount of air passing through the lower part of the heater 133 to the air passing through the evaporator 132. , is the main component.

The case 140 includes a side vent opening 142 through which air is blown to the upper part of the front seat and the end in the vehicle width direction, and a center vent opening through which air is blown to the upper part of the front seat and the center in the vehicle width direction. 143 and a rear opening 144 through which air is blown to the rear seats.

A rear duct 116 through which air from the rear opening 144 can pass is connected to the rear opening 144, and at the downstream end of the rear duct 116 there is a rear seat air blower that can switch whether or not to blow out the air to the rear seats. A switching section 117 is provided. The rear seat ventilation switching section 117 is formed of a louver, and the occupant can adjust the downstream end of the rear duct 116 from fully closed to fully open by sliding the operating section 117a.

According to research conducted by the present inventors, the following problems occur when the rear seat ventilation switching section 117 is fully closed and the air flow from the rear opening 144 is suddenly stopped by a rear seat occupant. I found out that it occurs. Note that no problem occurred when the rear duct 116 was fully open.

Also refer to FIG. FIG. 8 shows the relationship between the blowing air temperature and the mix door position. The vertical axis shows the blown air temperature, and the horizontal axis shows the mix door position. In the mixed door position, the left end is at full cool and the right end is at full hot.

Full cool means a case where the proportion of air passing through the heater 133 out of the air passing through the evaporator 132 is the smallest. In other words, during full cooling, the amount of overlap between the upper and

lower mix doors

150, 160 on the heater 133 is greatest. On the other hand, full hot means a case where the proportion of air passing through the heater 133 out of the air passing through the evaporator 132 is the highest. In other words, the amount of overlap between the upper and

lower mix doors

150, 160 on the heater 133 is the smallest when the mixer is fully hot. The proportion of air passing through the heater 133 increases from full cool to full hot, and the temperature of the blown air also becomes high.

The relationship between the mix door position and the blowout temperature at the side vent opening 142 is shown by a solid line, and the relationship between the mix door position and the blowout temperature at the center vent opening 143 is shown by a broken line.

In the temperature conditioning mode, which mixes both the cold air that has passed only through the evaporator 132 and the warm air that has passed through the heater 133 to create temperature-balanced air, the temperature of the air blown out from the center vent opening 143 is T1. The temperature of the air blown out from the side vent opening 142 was T2.

Originally, when the mix door positions are at the same position, it is preferable that the temperature of the air blown from the side vent opening 142 and the temperature of the air blown from the center vent opening 143 be the same. The air blown out from the

respective openings

142 and 143 is blown toward the upper body of the front seat occupant, but if the temperatures of the air hitting the front seat occupant are different, the comfort of the occupant will be impaired.

However, it was found that the difference between the temperature T1 of the blown air blown out from the center vent opening 143 and the temperature T2 of the blown air blown out from the side vent opening 142 exceeded an allowable range.

An object of the present invention is to provide a vehicle air conditioning unit with improved comfort.

In the following description, reference numerals in the accompanying drawings will be added in parentheses in order to facilitate understanding of the present invention, but the present invention is not thereby limited to the illustrated form.

According to the present disclosure, there is provided a rear duct (16) for blowing air to the rear seat (13) in the vehicle interior (11), and a rear duct (16) provided in the rear duct (16) for blowing out the air to the rear seat (13). A vehicle air conditioning unit (20) that can be installed in a vehicle and is equipped with a rear seat ventilation switching section (17) that can switch whether or not to
A case (40), an evaporator (32) provided inside the case (40) and capable of cooling the blown air, a heater (33) capable of heating the blown air that has passed through the evaporator (32), and the heater an upper cold air bypass (By1) which is a flow path formed above the heater (33) and through which the blown air bypassing the heater (33) can pass; and a flow path formed below the heater (33). There is a lower cold air bypass (By2) through which the air that bypasses the heater (33) can pass, and air that passes through the upper cold air bypass (By1) and air that passes through the upper part of the heater (33). an upper mix door (50) whose ratio with air can be adjusted; and blown air that is slidably disposed between the evaporator (32) and the heater (33) and passes through the lower cold air bypass (By2). A lower mix door (60) that can adjust the ratio of the blown air passing through the lower part of the heater (33) and the upper part of the heater (33) to the blown air passing through the upper cold air bypass (By1). The upper mix space (Mi1) is a space in which the blown air that has passed through is mixed to form upper conditioned air, and the blown air that has passed through the lower cold air bypass (By2) and the lower part of the heater (33). A lower mix space (Mi2), which is a space where the blown air is mixed with lower conditioned air,
The case (40) includes a side vent opening (42) for supplying the upper conditioned air to the upper part of the front seat (12) in the vehicle interior (11) and the end in the vehicle width direction; a center vent opening (43) provided below the vent opening (42) for supplying the upper conditioned air to the upper part of the front seat (12) and approximately at the center in the vehicle width direction; and the lower conditioned air. a rear opening (44) for supplying the fuel to the rear seat (13);
The lower mix door (60) includes a rotating shaft section (61) rotatably supported by the case (40), a pinion section (62) provided on the rotating shaft section (61), and a rotating shaft section (62) that is rotatably supported by the case (40). a shutter body (64) that is formed with a rack part (63) that fits with the part (62) and is slidable from the upstream surface of the heater (33) to the lower cold air bypass (By2);
An auxiliary adjustment part (65) that can adjust the flow rate of the blown air by adjusting the flow path area of the lower cold air bypass (By2) is formed in the rotation shaft part (61),
The auxiliary adjustment section (65) allows both the blast air that has passed through the lower part of the heater (33) and the blast air that has passed through the lower cold air bypass (By2) to flow toward the rear opening (44). At this time, a vehicle air conditioning unit is provided in which the flow passage cross-sectional area of the lower cold air bypass (By2) is narrowed.

According to the present invention, a vehicle air conditioning unit with improved comfort can be provided.

FIG. 1 is a schematic diagram of a vehicle equipped with a vehicle air conditioning unit according to an embodiment. FIG. 2 is a perspective view of the vehicle air conditioning unit shown in FIG. 1. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. FIG. FIG. 4 is a perspective view of the lower mix door shown in FIG. 3; FIG. 3 is an explanatory diagram of the operation of the vehicle air conditioning unit in the mixed mode. FIG. 3 is an explanatory diagram of the operation of the vehicle air conditioning unit in full cool mode. FIG. 3 is a diagram illustrating the relationship between the blown air temperature and the mix door position in the vehicle air conditioning unit shown in FIG. 2. FIG. FIG. 3 is a cross-sectional view of a vehicle air conditioning unit according to a comparative example. 8 is a diagram illustrating the relationship between the temperature of the blown air and the mix door position in the vehicle air conditioning unit shown in FIG. 7. FIG.

Embodiments of the present invention will be described below based on the accompanying drawings. In the figure, Fr indicates the front with respect to the vehicle traveling direction, Rr indicates the rear with the vehicle traveling direction as a reference, Le is the left as seen from the passenger, Ri is the right as seen from the passenger, Up is the top, and Dn is the bottom.

<Example>
Please refer to FIG. FIG. 1 shows a vehicle 10 on which a vehicle air conditioning unit 20 is mounted. The vehicle 10 is, for example, a passenger car, and has left and right front seats 12, 12 provided at the front inside the vehicle interior 11, and a seat provided behind these

front seats

12, 12 across both ends in the vehicle width direction. It has a rear seat 13.

The vehicle air conditioning unit 20 is provided in front of the

front seats

12, 12, and is used to blow air adjusted to a predetermined temperature to the occupants of the

front seats

12, 12 and the rear seat 13. In the vehicle 10, front external

ventilation switching parts

14, 14 are formed in front of the front seat 12 and on the outside in the vehicle width direction, and are capable of switching whether or not to blow out the blown air. At the center in the vehicle width direction, front middle

ventilation switching parts

15, 15 are formed that can switch whether or not to blow out the blown air. A rear duct 16 extending toward the rear seat 13 is connected to the vehicle air conditioning unit 20, and air can be blown to the rear seat 13 via the rear duct 16. At the rear end or downstream end of the rear duct 16, rear seat

ventilation switching parts

17, 17 are provided that can switch whether or not to blow air to the rear seat 13.

The rear duct 16 can be arranged, for example, to extend rearward along the lower surface of the center console and upward along the rear surface of the center console. Alternatively, it may pass under the floor of the vehicle interior and stand up along the B pillar. Alternatively, it may be arranged such that it branches in the middle and can blow air to the upper and lower bodies of the rear seat occupant.

Each of the air

blowing switching parts

14, 15, and 17 is constituted by a louver, and an occupant can switch the air blowing amount from fully open to fully closed by swinging the

operating parts

14a, 15a, and 17a.

Refer to Figure 2. The vehicle air conditioning unit 20 includes a blower section 21 that can take in and blow air from inside the vehicle and/or outside the vehicle, and a temperature control section that can adjust the blown air sent from the blower section 21 to a predetermined temperature. 30. The wind sent from the air blower 21 toward the left flows toward the rear inside the temperature adjustment section 30.

The blowing section 21 can adopt a well-known configuration, and includes a built-in blower fan, for example.

Refer to Figure 3. The temperature control unit 30 includes a case 40 into which the air from the blower unit 21 (see FIG. 2) is flowed, an evaporator 32 that is provided inside the case 40 and is capable of cooling the air, and a case 40 in which the air from the blower unit 21 (see FIG. 2) is sent. A heater 33 capable of heating air; an upper mix door 50 provided in front of the upper part of the heater 33 and capable of adjusting the amount of air passing through the heater 33; and an upper mix door 50 provided in front of the lower part of the heater 33 and allowing air to pass through the heater 33. The main component is a lower mix door 60 whose amount can be adjusted.

Inside the case 40, there is an upper cold air bypass By1 above the heater 33 through which the air bypassing the heater 33 can pass, and a lower cool air bypass By1 below the heater 33 through which the air bypassing the heater 33 can pass. The air that has passed through the side cold air bypass By2 and the upper mix space Mi1 where the air that has passed through the upper cold air bypass By1 and the air that has passed through the upper part of the heater 33 is mixed to form upper conditioned air, and the air that has passed through the lower cold air bypass By2. A lower mix space Mi2 is formed in which the air and the blown air that has passed through the lower part of the heater 33 are mixed to form lower conditioned air.

Please also refer to Figure 1. The case 40 includes a defroster opening 41 through which air is blown out to blow air toward the windshield, and a front external ventilation switching section 14 (in the passenger compartment 1 a side vent opening 42 for supplying the upper side conditioned air to the upper part of the front seat 12 (the upper part and the end in the vehicle width direction); A center vent opening 43 for supplying lower conditioned air to the upper part of the front seat 12 (approximately the center in the vehicle width direction) and a rear opening 44 for supplying lower conditioned air to the rear seat 13 via the rear duct 16 are formed. has been done.

Refer only to FIG. 2. The case 40 has

foot openings

45, 45 formed on its left side and right side for supplying lower conditioned air below the

front seats

12, 12. The

foot openings

45, 45 are not shown in FIG. 3 because they are formed on the right side and left side of the case 40.

The rear opening 44 is preferably formed below the case 40 and at the center in the left-right direction. When the rear duct 16 is provided so as to extend along the lower surface of the center console, connection can be facilitated.

Refer only to FIG. 3. Air volume adjustment doors 36 to 39 are provided in the vicinity of each of the openings 41 to 44 so as to be swingable, and the amount of air blown out can be adjusted by adjusting the degree of opening of the openings 41 to 44. There is. Although not shown, an air volume adjustment door is also provided near the

foot openings

45, 45.

Note that the case 40 is divided into left and right rooms by a partition wall (not shown). Openings 41 to 44 and air volume adjustment doors 36 to 39 are formed in each of the left and right rooms. The same applies to the foot opening 45 and the air volume adjustment door for the foot opening 45.

One evaporator 32 is provided so as to be substantially orthogonal to the direction in which air flows (from left to right in the drawing). A refrigerant flows through the evaporator 32, and the air passing through the evaporator 32 is cooled by heat exchange with the refrigerant. Blow air from the blower section 21 (see FIG. 2) is taken into the case 40 from the front of the evaporator 32, is bent approximately 90 degrees, and passes through the evaporator 32.

As the heater 33, a hot water heater through which hot water is flowed, an electric heater that generates heat when energized, or a refrigerant radiator through which a refrigerant is flowed can be used. Moreover, these can also be used in combination.

The upper mix door 50 includes an upper rotating shaft section 51 rotatably supported by the case 40, an upper pinion section 52 provided on the upper rotating shaft section 51, and an upper rotating shaft section 51 that fits into the upper pinion section 52. The upper shutter body 54 is slidable from the upstream side of the heater 33 to the upper cold air bypass By1 by rotation of the upper shutter body 54. The upper mix door 50 can adjust the ratio of the blown air that passes through the upper cold air bypass By1 and the blown air that passes through the upper part of the heater 33, depending on the amount of overlap of the upper shutter body 54 with the heater 33.

The lower mix door 60 is slidably disposed between the evaporator 32 and the heater 33, and can adjust the ratio of the blown air that passes through the lower cold air bypass By2 and the blown air that passes through the lower part of the heater 33. .

Also refer to Figure 4. The lower mix door 60 includes a lower rotating shaft portion 61 (rotating shaft portion 61) rotatably supported by the case 40, and a lower pinion portion 62 (pinion portion 62) provided on the lower rotating shaft portion 61. and a lower shutter body 64 (shutter body 64) in which a lower rack part 63 (rack part 63) that fits with the lower pinion part 62 is formed and is slidable from the upstream of the heater 33 to the lower cold air bypass By2. ,have.

The lower rotating shaft portion 61 is formed with an auxiliary adjustment portion 65 that can adjust the flow rate of the blown air by adjusting the flow path area of the lower cold air bypass By2. The auxiliary adjustment section 65 is constituted by a plate-shaped member extending in the radial direction from the center of the lower rotating shaft section 61.

Refer to Figure 3. The auxiliary adjustment portion 65 is located overlapping the rear opening 44 with respect to the position in the vehicle width direction and the vertical direction. Further, the auxiliary adjustment portion 65 is located overlapping the center vent opening 43 with respect to the vehicle width direction.

In the state shown in FIG. 3, the lower shutter body 64 partially overlaps the heater 33 and partially blocks the lower cold air bypass By2. At this time, part of the blown air that has passed through the evaporator 32 passes through the lower part of the heater 33, and part of it passes through the lower cold air bypass By2. In such a case, the auxiliary adjustment section 65 narrows the flow path cross-sectional area of the lower cold air bypass By2. In other words, the auxiliary adjustment unit 65 adjusts the lower cold air bypass By2 when both the air that has passed through the lower part of the heater 33 and the air that has passed through the lower cold air bypass By2 flow toward the rear opening 44. It is provided in the lower rotating shaft portion 61 so as to narrow the cross-sectional area of the flow path.

The operation of the vehicle air conditioning unit 20 described above will be explained.

Refer to FIG. 5A. When both the blast air that has passed through the lower part of the heater 33 and the blast air that has passed through the lower cold air bypass By2 flow toward the rear opening 44, the auxiliary adjustment unit 65 disconnects the flow path of the lower cold air bypass By2. Reduce area. As a result, the flow rate of the blast air passing through the lower cold air bypass By2 decreases. Since the flow rate of the blown air passing through the lower cold air bypass By2 is small, the flow rate of hot air required to adjust the temperature to a predetermined temperature is also small. That is, the flow rate of the blown air passing through the lower part of the heater 33 is also small. Relatively, the flow rate of the blast air passing through the upper cold air bypass By1 and the flow rate of air passing through the upper part of the heater 33 increase.

The present inventors closed the rear seat ventilation switching section 17 (see FIG. 3) and calculated the difference between the temperature of the air blown out from the side vent opening 42 and the temperature of the air blown out from the center vent opening 43. I measured it.

Also refer to Figure 6. FIG. 6 shows the relationship between the blowing air temperature and the mix door position. The vertical axis shows the blown air temperature, and the horizontal axis shows the mix door position. In the mixed door position, the left end is at full cool and the right end is at full hot.

In the state shown in FIG. 5A, the temperature of the blown air blown out from the center vent opening 43 was T3, and the temperature of the blown air blown out from the side vent opening 42 was T4.

Refer to FIGS. 6 and 8. The difference (T4-T3) between the temperature T3 of the blown air when the flow path area is narrowed by the auxiliary adjustment unit 65 (see FIG. 5A) and the temperature T4 of the blown air is the difference between the temperature of the blown air when the auxiliary adjustment unit 65 (see FIG. 5A) is not used. The difference was smaller than the difference between the air temperature T1 and the blown air temperature T2 (T2-T1). In other words, (T4-T3)<(T2-T1). The value of T4-T3 was a sufficiently tolerable difference that did not cause discomfort to the occupants.

Refer to FIG. 5B. FIG. 5B shows the vehicle air conditioning unit 20 in full cool mode. From the state shown in FIG. 5A, the upper and lower

rotating shaft parts

51 and 61 rotate, and the upper and

lower shutter bodies

54 and 64 slide to substantially cover the front surface of the heater 33. By rotating together with the lower rotating shaft portion 61, the auxiliary adjustment portion 65 is oriented in the direction along the flow of the blown air. That is, the auxiliary adjustment unit 65 maximizes the flow path cross-sectional area of the lower cold air bypass By2 in the full cool mode in which the amount of blown air passing through the lower part of the heater 33 is the smallest.

For example, in the full cool mode, the difference between the flow rate of cold air passing through the upper cold air bypass By1 and the flow rate of cold air passing through the lower cold air bypass By2 is the smallest.

Note that in the full hot mode, most or all of the lower cold air bypass By2 is closed by the lower shutter body 64. For this reason, there is no need for adjustment by the auxiliary adjustment section 65, and hardly any blown air flows to the lower cold air bypass By2. Therefore, the auxiliary adjustment section 65 may be oriented in any direction.

The vehicle air conditioning unit 20 described above has the following effects.

Refer to FIGS. 7 and 8. When the rear seat ventilation switching section 117 is closed in a temperature range where cold air and warm air are mixed, the temperature T2 of the conditioned air blown out from the side vent opening 142 and the temperature of the conditioned air blown out from the center vent opening 143 change. It was found that the difference from T1 exceeded a predetermined value. By closing the flow path by the rear seat ventilation switching section 117, more of the cold air that has passed through the lower cold air bypass By2 is blown out from the center vent opening 143 formed below than the side vent opening 142. considered to be a thing. Alternatively, the cold air that has passed through the lower cold air bypass By2 flows along the rear wall of the case 40, and is formed downstream of the side vent opening 142 when viewed along the flow direction of the lower conditioned air. It is thought that more air is blown out from the center vent opening 143. In comparison, more of the warm air that has passed through the lower part of the heater 133 is blown out from the side vent opening 142. As a result, it is considered that the difference between the temperature T2 of the conditioned air blown out from the side vent opening 142 and the temperature T1 of the conditioned air blown out from the center vent opening 143 exceeds the predetermined value.

Refer to FIGS. 5A and 6. In this regard, in the vehicle air conditioning unit 20, when both the blast air that has passed through the lower part of the heater 33 and the blast air that has passed through the lower cold air bypass By2 are sent to the rear opening 44, the lower cold air bypass By2 is By reducing the opening degree, the amount of air blown into the lower mix space Mi2 in this temperature range can be reduced. By reducing the amount of air blown, the amount of cold air flowing into the center vent opening 43 can be reduced even if the flow path of the rear duct 16 is closed by the rear seat air switching section 17. Furthermore, by reducing the amount of air blown, the amount of hot air flowing into the side vent opening 42 can be reduced. Thereby, the difference between the temperature T3 of the blown air blown out from the center vent opening 43 and the temperature T4 of the blown air blown out from the side vent opening 42 was able to be within a predetermined range. A vehicle air conditioning unit 20 with improved comfort can be provided.

Refer to Figure 3. If the rear seat ventilation switching section 17 is suddenly closed, the flow of the cold air that has passed through the lower cold air bypass By2 toward the rear duct 16 will be suddenly blocked. In this case, the cold air that has passed through the lower cold air bypass By2 flows along the downstream side of the lower mix space Mi2, that is, along the inner wall surface of the case 40, and reaches the upper mix space Mi1. If the center vent opening 43 is provided downstream of the side vent opening 42 when viewed along the flow direction of the lower conditioned air, the conditioned air blown out from the center vent opening 43 and the side The temperature difference with the conditioned air blown out from the vent opening 42 is more likely to increase. The present invention can efficiently exhibit its effects on such a vehicle air conditioning unit 20. Thereby, the comfort inside the vehicle interior 11 (see FIG. 1) can be further improved.

Refer to FIG. 5B. The auxiliary adjustment unit 65 maximizes the flow passage cross-sectional area of the lower cold air bypass By2 in the full cool mode. Normally, in the case of full cool mode, it is necessary to rapidly cool the interior of the vehicle interior 11 (see FIG. 1). By supplying blast air to the entire vehicle interior 11 in a situation where rapid cooling is required, the entire vehicle interior 11 can be quickly cooled. In addition, in the full cool mode, since the flow rate of the blown air that passes through the heater 33 is small (or does not pass through it), there is a problem that the temperature of the air blown out at the center vent opening 43 and the side vent opening 42 is different. It doesn't occur in the first place.

Refer to Figure 3. The auxiliary adjustment section 65 is located overlapping the rear opening 44 when viewed along the flow direction of the lower conditioned air. Even when the rear seat ventilation switching section 17 is suddenly closed, the flow rate of the blast air passing through the lower cold air bypass By2 is reduced in advance, so that the air is blown out from the side vent opening 42 and the center vent opening 43. The influence of the temperature of the conditioned air can be suppressed. The comfort inside the vehicle can be further improved.

The auxiliary adjustment section 65 is located overlapping the center vent opening 43 when viewed along the flow direction of the lower conditioned air. Even when the rear seat ventilation switching section 17 is suddenly blocked, the flow rate of the blast air passing through the lower cold air bypass By2 is reduced in advance, so that air is blown out from the center vent opening 43 and the side vent opening 42. The influence of the temperature of the conditioned air can be suppressed. Comfort within the vehicle interior 11 can be further improved.

Although the vehicle air conditioning unit according to the present invention has been described using an example in which the case is divided into left and right rooms, it is also applicable to a vehicle air conditioning unit that is not divided into left and right rooms.

Furthermore, it is also possible to provide a guide member (baffle plate) in the upper mix space Mi1 to guide the blown air to the side vent opening 42 and the center vent opening 43.

Further, although the upper mix door 50 has been described as having the slidable upper shutter body 54, it may be configured with a well-known cantilever door or butterfly door. The form of the upper mix door 50 is not limited as long as the ratio of the blown air passing through the upper cold air bypass By1 and the blown air passing through the upper part of the heater 33 can be adjusted.

The present invention is not limited to the examples as long as the functions and effects of the present invention are achieved.

The vehicle air conditioning unit of the present invention is suitable for being mounted on a passenger vehicle.

11... Vehicle interior 12... Front seat 13... Rear seat 16... Rear duct 17... Rear seat ventilation switching section 20... Vehicle air conditioning unit 32... Evaporator 33... Heater 40... Case 42... Side vent opening 43... Center vent opening 44...Rear opening 50...Upper mix door 60...Lower mix door 61...Lower rotating shaft (rotating shaft)
62...Lower pinion part (pinion part)
63...Lower rack part (rack part)
64...Lower shutter body (shutter body)
65... Auxiliary adjustment section By1... Upper cold air bypass By2... Lower cold air bypass Mi1... Upper mix space Mi2... Lower mix space

Claims

A rear duct (16) for blowing air to the rear seat (13) in the vehicle interior (11), and a rear duct (16) that is provided in the rear duct (16) and can switch whether or not to blow out the air to the rear seat (13). A vehicle air conditioning unit (20) that can be mounted on a vehicle equipped with a rear seat ventilation switching section (17),
A case (40), an evaporator (32) provided inside the case (40) and capable of cooling the blown air, a heater (33) capable of heating the blown air that has passed through the evaporator (32), and the heater an upper cold air bypass (By1) which is a flow path formed above the heater (33) and through which the blown air bypassing the heater (33) can pass; and a flow path formed below the heater (33). There is a lower cold air bypass (By2) through which the air that bypasses the heater (33) can pass, and air that passes through the upper cold air bypass (By1) and air that passes through the upper part of the heater (33). an upper mix door (50) whose ratio with air can be adjusted; and blown air that is slidably disposed between the evaporator (32) and the heater (33) and passes through the lower cold air bypass (By2). A lower mix door (60) that can adjust the ratio of the blown air passing through the lower part of the heater (33) and the upper part of the heater (33) to the blown air passing through the upper cold air bypass (By1). The upper mix space (Mi1) is a space in which the blown air that has passed through is mixed to form upper conditioned air, and the blown air that has passed through the lower cold air bypass (By2) and the lower part of the heater (33). A lower mix space (Mi2), which is a space where the blown air is mixed with lower conditioned air,
The case (40) includes a side vent opening (42) for supplying the upper conditioned air to the upper part of the front seat (12) in the vehicle interior (11) and the end in the vehicle width direction; a center vent opening (43) provided below the vent opening (42) for supplying the upper conditioned air to the upper part of the front seat (12) and approximately at the center in the vehicle width direction; and the lower conditioned air. a rear opening (44) for supplying the fuel to the rear seat (13);
The lower mix door (60) includes a rotating shaft section (61) rotatably supported by the case (40), a pinion section (62) provided on the rotating shaft section (61), and a rotating shaft section (62) that is rotatably supported by the case (40). a shutter body (64) that is formed with a rack part (63) that fits with the part (62) and is slidable from the upstream surface of the heater (33) to the lower cold air bypass (By2);
An auxiliary adjustment part (65) that can adjust the flow rate of the blown air by adjusting the flow path area of the lower cold air bypass (By2) is formed in the rotation shaft part (61),
The auxiliary adjustment section (65) allows both the blast air that has passed through the lower part of the heater (33) and the blast air that has passed through the lower cold air bypass (By2) to flow toward the rear opening (44). In this vehicle air conditioning unit, the flow passage cross-sectional area of the lower cold air bypass (By2) is narrowed.
The vehicle air conditioner according to claim 1, wherein the center vent opening (43) is provided downstream of the side vent opening (42) when viewed along the flow direction of the lower conditioned air. unit.
The auxiliary adjustment section (65) maximizes the flow passage cross-sectional area of the lower cold air bypass (By2) when in full cool mode, in which the amount of blown air passing through the lower part of the heater (33) is the smallest. The vehicle air conditioning unit according to claim 1 or claim 2.
Any one of claims 1 to 3, wherein the auxiliary adjustment part (65) is located overlapping the rear opening (44) when viewed along the flow direction of the lower conditioned air. The vehicle air conditioning unit according to item 1.
Any one of claims 1 to 4, wherein the auxiliary adjustment part (65) is located overlapping the center vent opening (43) when viewed along the flow direction of the lower conditioned air. The vehicle air conditioning unit according to item 1.