JP4457775B2 - Air conditioner for vehicles - Google Patents

Description

  The present invention relates to a vehicle air conditioner that forcibly blows air to a rear vent outlet or the like by rotation of a blower provided in a blower duct.

  2. Description of the Related Art Conventionally, there is known an air conditioner that guides conditioned air from an air conditioning unit provided at the front of a vehicle to a rear vent outlet on the rear seat side of the vehicle via a rear vent duct. In this type of air conditioner, there is a type in which a blower is disposed in a rear vent duct and the air in the rear vent duct is forcibly blown toward the rear vent outlet by the blower. Here, the rear vent duct and the front vent duct are connected downstream of the vent door of the air conditioning unit. When the vent door is opened according to the air conditioning mode, conditioned air is blown from the rear vent outlet and the front vent outlet, respectively. In addition, there exist the following as prior art literature regarding this kind of vehicle air conditioner.

JP-A-5-139148

  In the conventional vehicle air conditioner described above, when the conditioned air is blown only from the front vent outlet, the operation of the blower in the rear vent duct is stopped. However, since the rear vent duct is connected downstream of the vent door, the conditioned air that has passed through the vent door even though the blower is stopped is guided to the rear vent outlet and flows out of the rear vent outlet against the occupant's request. . In order to avoid this, if a door capable of opening and closing the duct passage is provided in the rear vent duct, the cost increases.

A vehicle air conditioner according to the present invention includes a first air duct located on the air conditioning unit side, and a second air duct that communicates with the first air duct in the vertical direction through a communication hole, and is generated by the air conditioning unit. Air-conditioning air that is disposed in a communicating portion between the air duct that guides the conditioned air to a predetermined air outlet provided in the vehicle interior and the first air duct in the second air duct, and is led into the air duct. A blower that blows air to the air outlet, a communication passage that communicates the internal space and the external space of the first air duct on the upstream side of the blower, and the conditioned air generated by the air conditioning unit when the blower stops When the pressure inside the first air duct becomes higher than that of the external space, the communication passage is opened, and when the blower rotates, the communication passage is closed by the negative pressure in the first air duct due to the rotation of the blower. Open and close door Characterized in that it comprises a.
In addition, the vehicle air conditioner according to the present invention is provided with an air duct that guides the conditioned air generated by the air conditioning unit to a predetermined air outlet provided in the vehicle interior, and is disposed in the air duct and led into the air duct. A blower that is driven by differential pressure between a blower that blows conditioned air to the outlet, a communication passage that communicates the internal space and external space of the air duct on the upstream side of the blower, and the internal space and external space of the blow duct, The open / close door is opened when the blower is stopped and closed when the blower rotates, and the air passage in the air duct between the blower and the communication passage is provided. The air passage is opened when the blower rotates, and the blower is stopped. And a passage door that closes the air passage.
Furthermore, the vehicle air conditioner according to the present invention includes an air duct that guides the conditioned air generated by the air conditioning unit to a predetermined air outlet provided in the passenger compartment, and a rotating duct that is provided in a substantially vertical direction. A blower that sucks air-conditioned air guided into the air duct from above and blows it to the air outlet, and a projecting portion that projects substantially inward in the air duct above the air fan, A plurality of parts are connected to each other over the entire circumference of the rotating shaft above the projecting part, abut against the projecting part by its own weight when the rotation of the blower is stopped, and provided with a gap between the projecting part by centrifugal force when the blower rotates. And a plate member.

According to the present invention, a communication passage is formed on the upstream side of the blower in the blower duct so as to communicate the internal space of the blower duct with the external space, and the blower is opened and closed by the open / close door that is opened and closed by the differential pressure between the internal space and the external space The communication passage was opened when the fan was stopped and closed when the blower was rotating. As a result, air in the air duct is discharged from the communication passage when the blower is stopped, so that air is not blown from the air outlet against the passenger's request, and there is no need to provide an actuator for opening and closing the door. It can be configured at low cost.
Further, according to the present invention, the rotating shaft of the blower is provided in the vertical direction, and the protruding portion that protrudes in the horizontal direction inward of the blowing duct is formed above the blower, and the rotating shaft is disposed above the protruding portion. A plurality of plate members are connected to each other, and the plate member abuts against the projecting portion by its own weight when the rotation of the blower is stopped, and a gap is formed between the plate member and the projecting portion by centrifugal force when the blower rotates. As a result, the passage is closed by the plate member when the blower is stopped, so that air is not blown from the air outlet against the occupant's request, and there is no need to separately provide an actuator for driving the plate member. it can.

-First embodiment-
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a perspective view showing an overall configuration of a vehicle air conditioner according to a first embodiment of the present invention. The vehicle air conditioner according to the present embodiment includes an air conditioning unit 100 that generates conditioned air, and rear vent ducts 21 to 24 that guide the conditioned air from the air conditioning unit 100 to a pair of left and right rear vent outlets 20 facing the rear seat. The rear fan 25 is housed in the rear vent duct 22 and forcibly blows the conditioned air from the air conditioning unit 100 to the rear vent outlet 20. The air conditioning unit 100 is disposed inside the instrument panel in front of the vehicle interior, and the rear vent ducts 21 to 24 are extended below the floor carpet in the vehicle front-rear direction. Although not shown, the vehicle air conditioner further includes a rear foot outlet that faces the foot of the rear seat, and a rear foot duct (13 in FIG. 2) that guides the conditioned air from the air conditioning unit 100 to the rear foot outlet.

  A schematic configuration of the air conditioning unit 100 is shown in FIG. The air conditioning unit 100 mainly includes a blow aching unit 101 that sucks and cools air and a heater unit 102 that heats air.

  A blower fan 4 is disposed at the inlet of the duct 3 of the air conditioning unit 100, and the blower fan 4 is rotated by driving a blower motor 5. When the blower fan 4 rotates, the inside air or the outside air is sucked into the duct 3 from the inside air suction duct 61 or the outside air suction duct 62 via the inside / outside air switching door 6, and is cooled by passing through the evaporator 1. This cooling air passes through the heater core 2 at a rate corresponding to the opening degree of the air mix door 7 and is heated or bypasses the heater core 2 while remaining as cooling air. The air that has passed through and bypassed the heater core 2 is mixed in the air mix chamber 8 downstream of the heater core 2 to obtain conditioned air at a predetermined temperature.

  A vent duct 94, a foot duct 95, and a differential duct 96 are connected to the air mix chamber 8 via an openable / closable vent door 91, a foot door 92, and a differential door 93, respectively. The vent duct 94 branches into a front vent duct 11 and a rear vent duct 21, and the foot duct 95 branches into a front foot duct 12 and a rear foot duct 13. Thus, the conditioned air that has passed through the vent door 91 is guided to the front vent air outlet provided in the instrument panel and the rear vent air outlet 20 described above, and the air conditioned air that has passed through the foot door 95 is provided facing the feet of the front seat. The conditioned air that has been guided to the front foot outlet and the rear foot outlet described above and passed through the defrost door 92 is guided to the defrost outlet near the front window.

  The blowout doors 91 to 93 are opened and closed as follows, for example, according to the air conditioning mode. In the vent mode, the vent door 91 is opened and the foot door 92 and the differential door 93 are closed. In the bi-level mode, the vent door 91 and the foot door 92 are opened and the differential door 93 is closed. In the foot mode, the foot door 92 is opened and the vent door 91 and the differential door are opened 93 is closed, and in the defrost mode, the differential door 93 is opened and the vent door 91 and the foot door 92 are closed.

  The air conditioning mode is controlled by a known air conditioning controller. That is, using the set temperature, the amount of solar radiation, the passenger compartment temperature, and the outside air temperature, the target blowing temperature is calculated by a well-known arithmetic expression, and the target opening degree of the air mix door 7 is calculated based on the deviation between the target blowing temperature and the current suction temperature. Is calculated. And opening / closing of the blower outlet doors 91-93 is automatically controlled according to a target air mix door opening degree. Each drive of the blower motor 5, the inside / outside air switching door 6, and the air mix door 7 is also controlled according to the target air mix door opening. These can be controlled manually according to the occupant's switch operation.

  The rear fan 25 is driven in response to a passenger's switch operation. That is, the rear fan 25 rotates when the rear vent switch is turned on and stops when the rear vent switch is turned off. The rotation of the rear fan 25 is allowed only when the vent door 91 is opened (during vent mode or bi-level mode), and is prohibited when the vent door 91 is closed.

  Next, a characteristic configuration of the vehicle air conditioner according to the first embodiment will be described. 3 is a cross-sectional view taken along line III-III in FIG. 1, that is, a vertical cross-sectional view of the rear vent duct 21. As shown in FIG. The rear vent duct 22 is attached to the lower end surface of the end of the rear vent duct 21, and the rear vent ducts 21 and 22 communicate with each other in the vertical direction through the communication hole 26. Rear vent ducts 23 and 24 are mounted on the side surfaces of the rear vent duct 22, and the rear vent ducts 22 and 23 and the rear vent ducts 22 and 24 communicate with each other in the horizontal direction through communication holes 27. The rear ducts 21 to 24 are respectively stored between the floor carpet 28 and the vehicle body frame 29.

  The rear fan 25 is supported from the vehicle body frame 29 via the rear vent duct 22. The rear fan 25 is a blower fan, the suction surface in the rotation axis direction faces the communication hole 26, and the discharge surface in the centrifugal direction faces the communication hole 27. When the rear fan 25 rotates, the pressure above the rear fan 25 becomes negative and air is sucked from the rear vent duct 21 and discharged to the rear vent ducts 23 and 24.

  An opening / closing door 31 for opening and closing the duct passage is provided in the rear vent duct 21 upstream of the rear fan 24. A discharge port 32 is opened at the end of the open / close door 31, and the rear vent duct 21 and the lower space SP of the floor carpet 28 communicate with each other through the discharge port 32. The open / close door 31 is rotatably supported with a pivot shaft 33 provided at the upper end thereof as a fulcrum, and opens and closes as will be described later according to the pressure difference between the rear vent duct 21 and the space SP. The open / close door 31 is formed to be light in weight so as to open and close even with a small pressure difference. As shown in FIG. 1, the front end of the rear vent duct 21 branches into three sides, the rear of the vehicle and the left and right sides.

The main operation of the vehicle air conditioner according to the first embodiment will be described.
For example, the vent door 91 is closed in the foot mode. At this time, the conditioned air is not blown into the rear vent duct 21, and the open / close door 31 is closed by its own weight. On the other hand, in the vent mode, the vent door 91 is opened, and the conditioned air is blown to the rear vent duct 21. When the rear vent switch is turned on in this state, the rear fan 25 rotates, and the air in the rear vent duct 21 is forcibly blown toward the rear vent outlet 20 and blown out from the rear vent outlet 20 toward the rear seat occupant. As a result, the ventilation in the rear vent ducts 21 to 24 is assisted, and the desired ventilation can be obtained even when the rear vent ducts 21 to 24 are long and the ventilation resistance is large.

  When the rear fan 25 rotates, the upstream side of the rear fan 25 has a negative pressure, and the pressure in the space SP becomes larger than the pressure in the rear vent duct 21. Thus, as shown in FIG. 3, a differential pressure that closes the door acts on the opening / closing door 31, and the discharge port 32 is sealed by the opening / closing door 31. Therefore, since the conditioned air in the rear vent duct 21 does not flow into the space SP, it is possible to suppress a decrease in the air volume. Further, since the air in the space SP does not flow into the rear vent duct 21, the conditioned air whose temperature is adjusted by the air conditioning unit 100 can be blown from the rear vent outlet 20 as it is.

  When the rear vent switch is turned off in the vent mode, the rotation of the rear fan 25 stops. At this time, since the air that has passed through the vent door 91 is guided to the rear vent duct 21, the pressure in the rear vent duct 21 is higher than the pressure in the space SP. As a result, as shown in FIG. 4, differential pressure is applied to the open / close door 31 to open the door, and the three open / close doors 31 are opened. In this case, of the three open / close doors 31, the surface of the open / close door 31 positioned on the extension of the rear vent duct 21 is substantially perpendicular to the air flow in the rear vent duct 21 when the door 31 is closed. . Therefore, a larger wind pressure acts on the opening / closing door 31, and the opening of the door 31 is particularly easy.

  When the opening / closing door 31 is opened, the air in the rear vent duct 21 is discharged from each discharge port 32, and the discharged air diffuses in the lower space SP of the floor carpet 28. Thereby, the space between the rear vent ducts 21 to 24 and the floor carpet 28 is insulated by the air layer, and heat input from the rear vent ducts 21 to 24 and the rear fan 25 to the floor carpet 28 can be reduced. In this case, the air in the rear vent duct 21 is discharged from three directions, so that the air is diffused over a wide range and an efficient heat insulating effect can be obtained. Moreover, the area of the discharge port 32 increases, and noise during air discharge can be reduced. When the vent door 91 is closed and the pressure difference between the rear vent duct 21 and the space SP disappears, the open / close door 31 is closed by its own weight.

According to the above 1st Embodiment, there can exist the following effects.
(1) A discharge port 32 is opened in the rear vent duct 21 upstream of the rear fan 25, and an open / close door 31 is provided so as to face the discharge port 32, so that the space between the rear vent duct 21 and the space SP below the floor carpet 28 is provided. The open / close door 31 is opened and closed by the differential pressure. That is, the opening / closing door 31 is closed when the pressure in the duct 21 becomes smaller than the pressure in the space SP due to the rotation of the rear fan 25, and the opening / closing door 31 is opened when the pressure in the duct 21 becomes larger due to the stop of the rear fan 25. . As a result, when the rear fan 25 is stopped, it is possible to prevent air from being blown out from the rear vent outlet 20 and to eliminate the discomfort of the occupant. Further, since the open / close door 31 is opened / closed by the differential pressure, it is not necessary to provide an actuator for driving the open / close door, and it can be configured at low cost.

(2) Since some of the open / close doors 31 are provided so as to be substantially perpendicular to the air flow in the rear vent duct 21 when the door 31 is closed, the vent door 91 is opened when the rear fan 25 is stopped. A large wind pressure acts on the surface of the opening / closing door 31, and the opening of the door 31 by the differential pressure is easy. Therefore, since the opening / closing door 31 is largely opened, it is not necessary to increase the number of the opening / closing doors 31 in order to secure the area of the discharge port 32, and the air conditioner can be downsized.
(3) Since the interior of the rear vent duct 21 and the lower space SP of the floor carpet 28 are communicated with each other via the discharge port 32, the air discharged from the discharge port 32 is diffused in the space SP and diffused. A heat insulating effect can be obtained by the air layer.
(4) Since the discharge ports 32 are provided in three directions, the air discharged from the discharge ports 32 can be efficiently diffused over a wide range, and noise during air discharge can be reduced.
(5) Since the opening / closing door 31 is provided so as to be rotatable about the rotation shaft 33 at the upper end, the opening / closing door 31 is closed by its own weight in a natural state. Therefore, even when the differential pressure between the rear vent duct 21 and the space SP, that is, the suction force of the rear fan 25 is small when the rear fan 25 rotates, the open / close door 31 can be kept closed.

-Second Embodiment-
A second embodiment of the present invention will be described with reference to FIGS.
In the first embodiment, a discharge port 32 is opened in the rear vent duct 21 and an opening / closing door 31 is provided in the discharge port 32, and the opening / closing door 31 is changed by a change in differential pressure inside and outside the duct as the rear fan 25 rotates / stops. In the second embodiment, the communication hole 26 is opened and closed according to the rotation / stop of the rear fan 25 without providing the discharge port 32 and the opening / closing door 31.

  5 is a perspective view of a main part of the vehicle air conditioner according to the second embodiment, FIG. 6 is a sectional view taken along line VI-VI in FIG. 5, and FIG. 7 is a perspective view of the rear vent duct 22 in FIG. It is. In addition, the same code | symbol is attached | subjected to the location same as FIGS. 1-4, and the difference with 1st Embodiment is mainly demonstrated below. As shown in FIG. 6, the rotating shaft 25a of the rear fan 25 protrudes above the communication hole 26, and a thin plate-shaped opening / closing plate 36 is connected to the upper end of the rotating shaft 25a via a pin 36a so as to be rotatable in the vertical direction. ing.

  As shown in FIG. 7, the opening / closing plate 36 has a substantially fan shape, and a plurality of opening / closing plates 36 are attached around the rotation shaft 25a over the entire circumference. The opening / closing plate 36 has a surface twisted in the centrifugal direction, and the cross section has a wing shape. The circumferential edge of each opening / closing plate 36 overlaps with the edge of the adjacent rotating plate 36 alternately, and the distal end of the opening / closing plate 36 is located on the upper surface 22a of the rear vent duct 22 projecting inward in the horizontal direction. It is in contact. In addition, the plate | board thickness of the opening / closing plate 36 is not constant in the centrifugal direction, and the connection part with the rotating shaft 25a is thinned.

  6 and 7 correspond to the stopped state of the rear fan 25. That is, when the rear fan 25 is stopped, the open / close plates 36 rotate downward due to their own weights and come into contact with the upper surface 22 a of the rear vent duct 22. As a result, the communication hole 26 is closed by the opening / closing plate 36. Therefore, even if the vent door 91 is opened, the air in the rear vent duct 21 hardly flows into the rear vent duct 22 and air blowing from the rear vent outlet 20 can be suppressed.

  On the other hand, when the rear fan 25 rotates, the opening / closing plate 36 also rotates together, and the opening / closing plate 36 is lifted by centrifugal force as shown in FIG. As a result, gaps are formed between the upper surface 22a of the rear vent duct 22 and the open / close plate 36 and between the open / close plates 36 adjacent to each other, and the air in the rear vent duct 21 is shown in FIG. So as to be sucked into the rear vent duct 22. Thereby, the conditioned air can be blown out from the rear vent outlet 20 when the rear fan 25 rotates. In this case, since the opening / closing plate 36 has a blade shape, it functions as an axial fan, and the suction efficiency of the fan can be increased.

  As described above, in the second embodiment, the plurality of opening / closing plates 36 are connected to the upper end portion of the rotating shaft 25a of the rear fan 25 so as to be rotatable in the vertical direction. It rotates downward and rotates upward by centrifugal force when the rear fan 25 rotates. As a result, the communication hole 26 can be opened and closed by the opening / closing plate 36 in accordance with the rotation / stop of the rear fan 25, and air blowing from the rear vent outlet 20 when the rear fan 25 is stopped can be suppressed. Further, since the opening / closing plate 36 is connected to the rotating shaft 25a of the fan 25, it is not necessary to separately provide an actuator for rotating the opening / closing plate 36, and the structure can be made at low cost. Since the opening / closing plate 36 has a wing shape, the opening / closing plate 36 functions as an axial fan and can efficiently suck air.

  In the above description, the opening / closing plate 36 is rotated in the vertical direction, but may be slid in the vertical direction. An example is shown in FIG. In FIG. 10, the upper end part of the rotating shaft 25a is tapered. A slit groove 25b is provided in the vertical direction on the peripheral surface of the rotary shaft, and an opening / closing plate 36 is connected to the slit groove 25b so as to be movable up and down. When the rear fan 25 is stopped, the opening / closing plate 36 moves downward as shown in the figure, and the communication hole 26 is closed by the opening / closing plate 36. When the rear fan 25 rotates, a centrifugal force acts on the opening / closing plate 36, so that the opening / closing plate 36 moves upward along the groove 25b. As a result, the communication hole 26 is opened.

-Third embodiment-
A third embodiment of the present invention will be described with reference to FIGS.
The third embodiment is different from the first embodiment in that a door capable of opening and closing the passage between the rear fan 25 and the discharge port is provided. Furthermore, in the first embodiment, the opening / closing door 31 is provided at the rear end of the rear vent duct 21 above the rear fan 25. However, in the third embodiment, the opening / closing door is provided in front of the rear fan 25.

  FIG. 11 is a vertical cross-sectional view in the front-rear direction showing the main part of the vehicle air conditioner according to the third embodiment. In addition, the same code | symbol is attached | subjected to the location same as FIG. 3, and the difference with 1st Embodiment is mainly demonstrated below. The rear vent duct 21 has a protruding portion 21A from the front to the rear of the vehicle at the front portion of the rear fan 25, and a discharge port for communicating the inside of the duct 21 and the lower space SP of the floor carpet 28 on the left and right side surfaces of the protruding portion 21A. 52 are opened. A substantially triangular opening / closing door 51 is attached to the left and right side surfaces of the urging portion 21A so as to block the discharge port 52, and the opening / closing door 51 is moved to the left and right with a pivot shaft 51a extending in the front-rear horizontal direction as a fulcrum. It can be rotated in the direction. The rear end portion of the rear vent duct 21 is closed. For this reason, the space for rotating the door is not required at the rear end portion of the rear vent duct 21, and the step portion 28a of the floor carpet 28 is located in front of the one in FIG.

  A butterfly door 53 is provided above the discharge port 52 of the urging portion 21 </ b> A so as to be pivotable in the vertical direction with a pivot shaft 53 a in the horizontal direction as a fulcrum, and a passage in the duct 21 by the rotation of the butterfly door 53. 54 is opened and closed. That is, the passage 54 is opened when the rear end portion of the butterfly door 53 is rotated upward as shown in FIG. 11, and the passage 54 is closed when the rear end portion of the butterfly door 53 is rotated downward as shown in FIG. The When the passage 54 is closed, the rear end portion of the butterfly door 53 comes into contact with the inner wall of the rear vent duct 21 and the door 53 is in a substantially horizontal state.

  The configuration of the butterfly door 53 will be described in detail. As shown in FIG. 13, the rotation shaft 53a of the butterfly door 53 is provided in front of the center of the door, and the center of gravity of the door is located behind the rotation shaft 53a. That is, at the rear part of the butterfly door 53, there is an unbalanced part 53A of the difference in length between the front side and the rear side of the rotation shaft 53a. A force (opening force F1) for opening the door 53 due to the air flow in the rear duct 21 acts on the butterfly door 53, and a force (closing force F2) for closing the door 53 due to the weight of the unbalanced portion 53U acts. .

  Here, the area of the unbalanced portion 53A is S, the upstream pressure of the butterfly door 53 is P2, the downstream pressure is P1, the weight of the unbalanced portion 53A is mg (m is mass, g is gravitational acceleration), If the angle between the butterfly door 53 and the horizontal line is θ, the opening force F1 is S × (P2−P1), and the closing force F2 is mgcosθ. Therefore, when the rotational moment due to the opening force F1 becomes larger than the rotational moment due to the closing force F2, the door 53 rotates in the R1 direction to open the passage 54, and when the rotational moment due to the opening force F1 becomes smaller than the rotational moment due to the closing force F2. 53 rotates in the R2 direction and the passage 54 is closed. Each part is set so that the rotational moment due to F1 is larger than the rotational moment due to F2 when the rear fan 53 rotates.

The main operation of the vehicle air conditioner according to the third embodiment will be described.
When the rear fan 25 is operated by turning on the rear vent switch in the vent mode, the pressure upstream of the rear fan 25 becomes negative, and the upstream pressure P2 of the butterfly door 53 becomes larger than the downstream pressure P1. As a result, an opening force F1 larger than the closing force F2 acts on the butterfly door 53, and the passage 54 is opened as shown in FIG. As a result, the air from the rear vent duct 21 is blown from the rear vent outlet 20 via the rear vent duct 22 and the rear vent ducts 23 and 24. In this case, since the closing force F2 is proportional to cos θ, the closing force F2 decreases as the opening degree θ of the butterfly door 53 increases, and the door 53 can be easily opened.

  At this time, the pressure P 0 in the lower space SP of the floor carpet 28 is larger than the upstream pressure P 2 of the butterfly door 53. The opening / closing door 51 is closed by this differential pressure, and the outflow of air from the discharge port 52 can be prevented. FIG. 14 shows the flow velocity distribution f of the rising portion 21A when the rear fan is rotating. As shown in the drawing, the air flow drifts in the urging portion 21A, and the backward (downward) flow rate is faster than the forward (upward) flow rate. For this reason, a dynamic pressure larger than that of the front portion acts on the rear portion (unbalance portion 53A) of the butterfly door 53, and the butterfly door 53 can be easily rotated by the air flow in the passage 54.

  On the other hand, when the operation of the rear fan 25 is stopped by turning off the rear vent switch in the vent mode, the pressure P2 in the passage 54 becomes higher than the pressure P0 of the space SP. Due to this differential pressure, the door 51 is opened as shown in FIG. 12, and the air in the passage 54 is discharged into the space SP. In this case, since the opening / closing door 51 is provided so as to open the lower side of the duct side, that is, the portion where the flow velocity is fast (see FIG. 14), the opening / closing door 51 is not outside the duct 21 without increasing the opening degree. A lot of air can be discharged.

  When the opening / closing door 51 is opened, the pressure P2 in the passage 54 decreases, and the opening force F1 becomes smaller than the closing force F2. As a result, the unbalanced portion 53A of the butterfly door 53 rotates downward, and the passage 54 is closed. As a result, the flow of air to the rear vent ducts 22 to 24 is blocked, and the blowout of air from the rear vent outlet 20 can be prevented. In this case, cos θ is maximized when the butterfly door 53 is horizontal, and the closing force F2 is maximized, so that a stable closed state can be maintained without increasing the weight of the unbalanced portion 53A.

According to 3rd Embodiment, there can exist the following effects.
(1) A butterfly door 53 is provided in the rear vent duct 21 upstream of the rear fan 25 so that the passage 54 can be opened and closed, and an open / close door 51 that opens and closes the discharge port 52 upstream of the butterfly door 53 is provided. The butterfly door 53 is opened and the open / close door 51 is closed, and the butterfly door 53 is closed and the open / close door 51 is opened when the rear fan 25 stops rotating. As a result, when the rear fan 25 stops rotating, it is possible to reliably prevent air from being blown out from the rear vent outlet 20 and to further improve the air conditioning comfort of the rear seat occupant.
(2) Since the opening / closing door 51 is provided on the side surface of the rear vent duct 21 in front of the rear fan, the step portion 28a of the floor carpet 28 under the foot of the rear seat occupant can be shifted to the front side from that of the first embodiment. Yes, the passenger's foot space is expanded. In addition, since the position of the opening / closing door 51 moves away from the occupant, noise to the occupant can be reduced.
(3) Since the butterfly door 53 is opened and closed by the pressure change in the passage 54 accompanying the rotation and stop of the rear fan 25, an actuator for driving the door is not necessary and can be configured at low cost.
(4) Since the butterfly door 53 closes the passage 54 in a horizontal state, the closing force F2 due to the weight of the unbalanced portion 53A is maximized when the door 53 is closed, and the closing is stable without increasing the unbalance amount. The force F2 can be secured. Further, as the opening degree θ of the butterfly door 53 becomes larger, the closing force F2 becomes smaller, and the door 53 can be easily opened by the air flow in the passage 54.
(5) Since the butterfly door 53 is provided at the ascending portion 21A of the rear vent duct 21, a large dynamic pressure is applied to the unbalanced portion 53A when the rear fan 25 is operated, and the door opening θ can be increased. As a result, the ventilation resistance in the passage 54 is reduced.
(6) Since the opening / closing door 51 is provided at a location where the flow velocity of the rising portion 21A of the rear vent duct 21 is high, a large amount of air can be discharged from the passage 54 to the space SP when the rear fan 25 is stopped. As a result, it is not necessary to increase the opening degree of the opening / closing door 51, and the degree of freedom in layout is improved.

  In the above embodiment, the blower fan 25 is used as the blower for blowing out the rear vent. However, an axial flow fan may be used. Although the above embodiment has been described by taking the air in the rear vent ducts 21 to 24 as an example, the present invention can also be applied to other air ducts (for example, a rear foot duct). Therefore, the air outlet of the present invention is not limited to the rear vent air outlet 20.

  In the first embodiment, the discharge port 32 is provided at the end of the rear vent duct 22. However, if the internal space of the duct communicates with the external space on the upstream side of the fan, the position and shape of the communication passage Is not limited to those described above. Although the opening / closing door 31 is provided so as to be rotatable in the vertical direction, the rotation direction is not limited to this as long as it is rotated by a change in the differential pressure between the inside and the outside of the duct accompanying rotation / stop of the fan. Although the discharge port 32 was provided in three places, the number of the discharge ports 32 is not restricted to this.

  In the second embodiment, the opening / closing plate 36 has a wing shape, but the shape of the plate member is not limited thereto. Although the opening / closing plate 36 is in contact with the upper end surface of the rear vent duct 22 when the fan 25 is stopped, the shape of the protruding portion is not limited to this.

  In the third embodiment, the butterfly door 53 is provided in the protruding portion 21A of the rear vent duct 21. However, the passage 54 is opened when the rear fan 25 rotates, and the downstream side of the discharge port 52 is stopped when the rear fan 25 is stopped. If the passage 54 is closed, the shape and arrangement of the passage door are not limited to those described above. Further, the position and shape of the discharge port 52 as the communication passage are not limited to those described above. That is, the present invention is not limited to the vehicle air conditioner according to the embodiment as long as the features and functions of the present invention can be realized.

The figure which shows the whole structure of the vehicle air conditioner concerning the 1st Embodiment of this invention. The figure which shows schematic structure of the air conditioning unit which comprises this invention. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1 and showing an operation during rotation of the rear fan. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1 and showing an operation when the rear fan is stopped. The principal part perspective view of the vehicle air conditioner concerning the 2nd Embodiment of this invention. FIG. 6 is a cross-sectional view taken along the line V-VI in FIG. 5 and showing the operation when the rear fan is stopped. The perspective view of the rear vent duct of FIG. FIG. 6 is a cross-sectional view taken along the line V-VI in FIG. 5 and showing the operation during rotation of the rear fan. The perspective view of the rear vent duct of FIG. The figure which shows the deformation | transformation of 2nd Embodiment. It is a front-back direction vertical sectional view of a vehicle air conditioner according to a third embodiment of the present invention, and shows an operation during rotation of a rear fan. It is a front-back direction vertical sectional view of the vehicle air conditioner according to the third embodiment of the present invention, and shows the operation when the rear fan is stopped. The figure which shows the structure of the butterfly door which comprises the vehicle air conditioner which concerns on 3rd Embodiment. The figure which shows the flow of the air in a rising part.

Explanation of symbols

20 Rear vent outlets 21 to 24 Rear vent duct 21A Ascending portion 22a Upper surface 25 Rear fan 25a Rotating shaft 28 Floor carpet 31 Open / close door 32 Discharge port 33 Rotating shaft 36 Open / close plate 51 Open / close door 52 Discharge port 53 Butterfly door 53A Unbalanced portion 54 Passage 100 Air conditioning unit

Claims (11)

A first air duct located on the air conditioning unit side, and a second air duct that communicates with the first air duct in the vertical direction through a communication hole, and the conditioned air generated by the air conditioning unit An air duct that leads to a predetermined air outlet provided in
A blower for blowing the second is disposed in a communicating portion between the first air duct in the blower duct, the conditioned air guided into the air duct to the air outlet,
A communication path communicating the internal space and the external space of the first air duct on the upstream side of the blower;
When the blower is stopped, the conditioned air generated by the air conditioning unit is guided and the inside of the first air duct becomes a pressure higher than that of the external space, thereby opening the communication passage and rotating the blower. An air conditioner for vehicles, comprising: an open / close door that closes the communication passage when the inside of the first air duct becomes negative pressure by the rotation of the blower . In the vehicle air conditioner according to claim 1,
The vehicular air conditioner is characterized in that the open / close door is provided such that the door surface faces the air flow in the air duct when the communication passage is closed. The vehicle air conditioner according to claim 1 or 2,
The air duct is a rear duct extending below the floor carpet in the vehicle front-rear direction, and the communication passage communicates the internal space of the rear vent duct and the external space between the floor carpet and the rear duct. An air conditioner for a vehicle, characterized in that it is provided in a vehicle. The vehicle air conditioner according to any one of claims 1 to 3,
A plurality of the communication passages are provided in different directions, and the open / close door is provided in each of the communication passages. In the vehicle air conditioner according to any one of claims 1 to 4,
The vehicular air conditioner is characterized in that the opening / closing door is provided so as to be pivotable in the vertical direction about a pivot shaft at the upper end. An air duct that guides the conditioned air generated by the air conditioning unit to a predetermined air outlet provided in the vehicle interior;
A blower that is arranged in the blower duct and blows the conditioned air guided into the blower duct to the outlet;
A communication passage communicating the internal space and the external space of the air duct on the upstream side of the blower;
An open / close door that is driven by a differential pressure between the internal space and the external space of the air duct, opens the communication passage when the blower stops, and closes when the blower rotates;
A passage door that is provided in an air passage in the air duct between the blower and the communication passage, opens the air passage when the blower rotates, and closes the air passage when the blower stops. A vehicle air conditioner characterized by the above. The vehicle air conditioner according to claim 6,
The air duct is a rear duct extending below the floor carpet in the vehicle front-rear direction, the open / close door is disposed in front of the blower, and the communication path is an internal space of the rear vent duct, and the floor carpet. And an external space between the rear duct and the outside air-conditioning apparatus. In the vehicle air conditioner according to claim 6 or 7,
The vehicle air conditioner, wherein the passage door is a butterfly door that opens and closes due to a pressure change in the air passage accompanying rotation and stop of the blower. The vehicle air conditioner according to claim 8,
The air-conditioning apparatus according to claim 1, wherein the air duct has a bulging portion where the air passage bulges, and the butterfly door and the opening / closing door are provided in the bulging portion. An air duct that guides the conditioned air generated by the air conditioning unit to a predetermined air outlet provided in the vehicle interior;
A blower that is rotatably arranged in the air duct around a rotation axis provided in a substantially vertical direction, sucks air-conditioned air guided into the air duct from above, and blows it to the outlet.
A projecting portion projecting in a substantially horizontal direction inward of the air duct above the blower;
Above the protrusions, they are connected over the entire circumference of the rotating shaft, abut against the protrusions by their own weight when the blower stops rotating, and a gap is formed between the protrusions by centrifugal force when the fan rotates. A vehicle air conditioner comprising: a plurality of plate members provided to occur. The vehicle air conditioner according to claim 10,
The vehicle air conditioner, wherein the plate member has a wing shape.

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