JP2023139393A - Air conditioning unit for vehicle - Google Patents

Abstract

To provide an air conditioning unit for vehicle capable of improving comfortability while allowing reaching a target temperature early in a cabin.SOLUTION: In an air conditioning unit for vehicle (20), an auxiliary adjustment part (65) capable of adjusting the flow rate of sent air by adjusting a flow passage area of a lower side cold air bypass (By2) is formed on a rotary shaft part (61) of a lower side mix door (60). When both sent air passing through a lower part in a heater (33) and sent air passing through the lower side cold air bypass (By2) flow toward a rear opening (44), the auxiliary adjustment part (65) reduces a flow passage cross-sectional area of the lower side cold air bypass (By2), and when in a full cool mode in which the rate of the sent air passing through the heater (33) is the smallest, it maximizes the flow rate of the sent air flowing to the lower side cold air bypass (By2).SELECTED DRAWING: Figure 3

Description

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 describes a vent air outlet that blows air toward the upper body of a front seat passenger, a rear opening that blows air to the rear seat, and a rear seat air blowing switching section (register) that can adjust the amount of air blowing to the rear seat. is disclosed.

A passenger in the rear seat can adjust the amount of air blown to the rear seat by operating the rear seat ventilation switching section.

Japanese Patent Application Publication No. 2006-298149

For example, while the vehicle air conditioning unit is operating, a passenger in the rear seat may operate the rear seat ventilation switching section to shut off the ventilation to the rear seats. In this case, the amount of air sent to the rear seats may be blown out from the vent opening. Since the amount of air blown to the front seat occupant suddenly increases, there is a risk that the comfort of the front seat occupant may be impaired.

As a countermeasure to this problem, in order to prevent a sudden increase in the amount of air blown to the front seats, it may be possible to narrow the flow path of air blown to the rear seats to reduce the amount of air blown to the rear seats. However, in this case, even if it is particularly necessary to blow air to the rear seats, a sufficient amount of air cannot be blown to the rear seats. In particular, during full cool mode, which is used when the temperature inside the vehicle is significantly higher than the target temperature, a sufficient amount of air cannot be blown to the rear seats.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle air conditioning unit that can quickly reach a target temperature in a vehicle interior and improve comfort.

In the following description, reference numerals in the accompanying drawings are 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 vent opening (42) for supplying the upper conditioned air to the upper part of the front seat (12) in the vehicle interior (11), and a vent opening (42) for supplying the lower conditioned air to the upper part of the front seat (12) in the vehicle interior (11). (13), a rear opening (44) for supplying the
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, the cross-sectional area of the flow path of the lower cold air bypass (By2) is narrowed, and when the amount of blown air passing through the heater (33) is in the full cool mode, which is the smallest, the air flow is directed to the lower cold air bypass (By2). A vehicle air conditioning unit is provided that maximizes the flow rate of blowing air.

According to the present invention, it is possible to provide a vehicle air conditioning unit that can reach the target temperature in the vehicle interior quickly and improve comfort.

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.

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 ventilation switching parts 14, 14 are formed in front of the front seat 12 and on the outside in the vehicle width direction, which can switch whether or not to blow out the ventilation 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.

For example, the rear duct 16 can be arranged 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 and 17 is constituted by a louver, and the amount of air blowing can be changed from fully open to fully closed by an occupant swinging the operating parts 14a and 17a.

See FIG. 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 have a well-known configuration, and includes a built-in blower fan, for example.

See FIG. 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 provided inside the case 40 and capable of cooling the air, and an evaporator 32 in which the air flows through the evaporator 32. A heater 33 that can heat the blown air, an upper mix door 50 that is provided in front of the upper part of this heater 33 and that can adjust the amount of air that passes through the heater 33, and an upper mix door 50 that is provided in the lower part of the front of the heater 33 that allows the air to pass through the heater 33. The main component is a lower mix door 60 that can adjust the amount of air.

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.

Also refer to FIG. The case 40 includes a defroster opening 41 through which air is blown out toward the windshield, and a defroster opening 41 formed above the upper mix space Mi1 to supply upper conditioned air to the front ventilation switching section 14. A vent opening 42 and a rear opening 44 for supplying lower conditioned air to the rear seat 13 via the rear duct 16 are formed.

Reference is made only to FIG. 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.

Reference is made only to FIG. Air volume adjustment doors 36 and 37 are swingably provided near the respective openings 41, 42, and 44, and can adjust the amount of air blown by adjusting the opening degrees of the openings 41, 42, and 44. , 39 are provided. 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, 42, 44 and air volume adjustment doors 36, 37, 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. A part of the air that has passed through the evaporator 32 is heated by passing through the heater 33 .

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 FIG. 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.

See FIG. 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 vent opening 42 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 on 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.

See 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.

See 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.

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.

Please refer to FIGS. 5A and 5B. The auxiliary adjustment unit 65 closes at least a portion of the lower cold air bypass By2 in a temperature range where cold air and warm air are mixed, and closes at least a portion of the lower cold air bypass By2 in a full cool mode in which the amount of blown air passing through the heater 33 is the smallest. Maximize the flow rate of the blast air flowing to the Generally, at a temperature close to the set temperature, both hot air and cold air are mixed and sent into the vehicle compartment 11. In such a temperature range, the auxiliary adjustment section 65 reduces the amount of air blown to the lower cold air bypass By2. As a result, it is possible to suppress a large change in the flow rate of the air blown out from the vent opening 42 when the rear seat ventilation switching section 17 (see FIG. 3) is operated, thereby improving comfort. be able to. On the other hand, in the full cool mode, the flow rate of the blast air flowing to the lower cold air bypass By2 is maximized. In full cool mode, where there is a large difference between the target temperature inside the vehicle compartment 11 and the temperature of the conditioned air blown out, the rear part of the vehicle compartment 11 is also It can be cooled quickly. It is possible to provide a vehicle air conditioning unit 20 that can quickly reach the target temperature in the vehicle interior 11 and improve comfort.

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 the flow rate of the blast air blown out from the vent opening 42 is reduced. increase can be suppressed. Comfort within the vehicle interior 11 can be further improved.

The auxiliary adjustment section 65 is located overlapping the vent opening 42 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 the flow rate of the blast air blown out from the vent opening 42 is reduced. The increase 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.

Further, it is also possible to provide a guide member (baffle plate) for guiding the blown air to the vent opening 42 in the upper mix space Mi1.

Moreover, although the upper mix door 50 has been described as having the slidable upper shutter body 54, it may be configured by 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... Vent opening 44... Rear opening 50... Upper mix door 60...Lower mix door 61...Lower rotating shaft section (rotating shaft section)
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 (3)

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 vent opening (42) for supplying the upper conditioned air to the upper part of the front seat (12) in the vehicle interior (11), and a vent opening (42) for supplying the lower conditioned air to the upper part of the front seat (12) in the vehicle interior (11). (13), a rear opening (44) for supplying the
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, the cross-sectional area of the flow path of the lower cold air bypass (By2) is narrowed, and when the amount of blown air passing through the heater (33) is in the full cool mode, which is the smallest, the air flow is directed to the lower cold air bypass (By2). Vehicle air conditioning unit that maximizes the flow rate of blowing air. The vehicle air conditioning unit according to claim 1, wherein the auxiliary adjustment section (65) is located overlapping the rear opening (44) when viewed along the flow direction of the lower conditioned air. . The auxiliary adjustment section (65) is located overlapping the vent opening (42) when viewed along the flow direction of the lower conditioned air. Vehicle air conditioning unit.

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