JP2008044404A - Ventilation flue switching device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a ventilation flue switching device capable of preventing wind leakage of a seal part in closing operation. <P>SOLUTION: This ventilation flue switching device has a rotary shaft 26 rotatably supporting both ends by an air-conditioning case 11 forming a ventilation flue, and has a face foot door 25 opening and closing the ventilation flue. The face foot door 25 is constituted by integrally forming a plate-like door base board part 25a and the rotary shaft 26 for performing the opening-closing action, and the door base board part 25a is constituted by forming one surface in a recess-projection shape. Thus, the wind leakage of the seal part in closing operation can be prevented. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a ventilation path switching device including door means for opening and closing a ventilation path, and is suitable for application to an air conditioning case of a vehicle air conditioner.

  Conventionally, as this kind of ventilation path switching device, for example, as shown in Patent Document 1, one applied to an air conditioning case of a vehicle air conditioner is known. The air conditioning case accommodates a heat exchanger for cooling and a heat exchanger for heating, and a door that opens and closes a plurality of outlet openings connected to an outlet provided in the passenger compartment and an air passage connected to the outlet opening. Means.

In the ventilation path leading to the blowout opening, conditioned air whose air volume ratio is adjusted by the air mix door is flowing through the air volume ratio of the cold air that has passed through the cooling heat exchanger and the warm air that has passed through the heating heat exchanger. Then, the door means is controlled to open and close in accordance with the blow mode, and a predetermined blow opening is opened to blow the conditioned air whose temperature is adjusted from the blow outlet in the passenger compartment.
JP 2003-267027 A

  However, in the said patent document 1, the door means is formed by integral molding using resin materials, such as a polypropylene, for weight reduction. The temperature in the air conditioning case where the door means is disposed is low when the outside air temperature outside the passenger compartment is high (midsummer) and high when the outside temperature is low (midwinter).

  Therefore, during the closing operation of the door means, a temperature difference is generated between the front and back of the door means (the upstream side of the ventilation path and the downstream side of the ventilation path). That is, the temperature difference causes thermal deformation such as warping in the door means. As a result, there is a problem that wind leakage occurs from the seal portion formed in the ventilation path.

  Therefore, an object of the present invention is to provide a ventilation path switching device capable of preventing wind leakage of a seal portion during a closing operation.

In order to achieve the above object, the technical means described in claims 1 to 8 are employed. That is, in the first aspect of the present invention, a door means (having rotating shafts (23, 26) whose both ends are rotatably supported by the case (11) forming the ventilation path, and opening and closing the ventilation path ( 22 and 25) in the ventilation path switching device,
The door means (22, 25) is formed of either a shape or a material capable of suppressing thermal deformation due to a temperature difference between the front and back of the door means (22, 25) during the closing operation. It is characterized by being. According to this invention, since the thermal deformation due to the temperature difference can be suppressed, it is possible to prevent wind leakage at the seal portion.

  In the invention according to claim 2, the door means (22, 25) is formed by integrally forming a flat door substrate portion (22a, 25a) and a rotating shaft (23, 26) that perform an opening and closing action. The door substrate portions (22a, 25a) are characterized in that one side is formed in an uneven shape.

  According to the present invention, by forming one surface in a concavo-convex shape, expansion due to temperature occurs on one surface, but the expansion can be absorbed by the recess. Thereby, thermal deformation, such as curvature, does not occur because the entire amount of thermal deformation can be suppressed. Therefore, it is possible to prevent wind leakage at the seal portion.

  In the invention according to claim 3, the door means (22, 25) is formed by integrally forming a flat door substrate portion (22a, 25a) and a rotating shaft (23, 26) that perform an opening and closing action. The door substrate portions (22a, 25a) are characterized in that one side is formed in a substantially mountain shape.

  According to this invention, by forming one surface in a substantially mountain shape, expansion due to temperature occurs on one surface, but the horizontal deformation can be reduced by expanding in the mountain direction. Thereby, thermal deformation, such as curvature, does not occur because the entire amount of thermal deformation can be suppressed. Therefore, it is possible to prevent wind leakage at the seal portion.

  In the invention according to claim 4, the door means (22, 25) is formed integrally with a flat door substrate portion (22 a, 25 a) that performs an opening / closing action and a rotating shaft (23, 26), And it is formed so that the air of the ventilation path upstream side may distribute | circulate to the root part of the ventilation path downstream side of a door board | substrate part (22a, 25a) and a rotating shaft (23, 26).

  According to the present invention, there is no temperature difference between the front and back of the base portion between the door base plate portion (22a, 25a) and the rotating shaft (23, 26), and thus thermal deformation such as warpage does not occur. Therefore, it is possible to prevent wind leakage at the seal portion.

  In the invention according to claim 5, the door means (22, 25) is formed integrally with a flat door substrate portion (22 a, 25 a) that performs an opening / closing action and a rotating shaft (23, 26), And when a temperature difference exceeds predetermined temperature, the door board | substrate part (22a, 25a) is formed with the shape memory material set to the shape which obstruct | occludes a ventilation path. According to this invention, thermal deformation such as warpage due to temperature difference does not occur. Therefore, it is possible to prevent wind leakage at the seal portion.

  The invention according to claim 6 is characterized in that the shape memory material is a shape memory resin. According to this invention, the door means (22, 25) can be easily formed in a shape that closes the ventilation path according to a predetermined temperature.

  The invention according to claim 7 is characterized in that the shape memory material is a shape memory alloy. According to this invention, the door means (22, 25) can be easily formed in a shape that closes the ventilation path according to a predetermined temperature.

  In the invention according to claim 8, the case (11) is an air conditioning case (11) configured in a vehicle air conditioner, and the door means (22, 25) is formed in the air conditioning case (11). It is characterized by being arranged on the upstream side of the ventilation path of the blowout opening (21, 24).

  According to the present invention, when the outside air temperature outside the passenger compartment is lowered in the air conditioning case (11), the temperature difference becomes large because the inside of the air conditioning case (11) is in the heating mode. Therefore, thermal deformation due to temperature difference is likely to occur. Therefore, since the door means (22, 25) is formed of a shape or material capable of suppressing the amount of thermal deformation, it is possible to prevent wind leakage at the seal portion. Is preferred.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment mentioned later.

(First embodiment)
In this embodiment, the ventilation path switching device according to the present invention is applied to an air conditioning case of a vehicle air conditioner, and will be described with reference to FIGS. FIG. 1 is a schematic diagram showing the overall configuration of the air conditioning case 11. FIG. 2 is a perspective view showing the entire configuration of the face foot door 25 as door means.

  FIG. 3 is an explanatory view showing an example of thermal deformation due to a temperature difference of the face foot door 25. FIG. 4 is a longitudinal sectional view showing the shape of the face foot door 25 in the first embodiment. In general, a ventilation system of a vehicle air conditioner is roughly divided into two parts, a blower unit (not shown) and an air conditioning unit 10 shown in FIG.

  The blower unit (not shown) is arranged offset from the central part to the passenger seat side in the lower part of the instrument panel in the passenger compartment, whereas the air conditioning unit 10 is in the lower part of the instrument panel in the passenger compartment. The vehicle is disposed substantially at the center in the left-right direction.

  As is well known, the blower unit is composed of an inside / outside air switching box for switching and introducing inside air (vehicle interior air) and outside air (vehicle outside air), and a blower for sucking and blowing air through the inside / outside air switching box. The air conditioning unit 10 is of a type in which both an evaporator 12 that is a cooling heat exchanger and a heater core 13 that is a heating heat exchanger are integrally incorporated in a common air conditioning case 11.

  The air conditioning case 11 is made of a resin molded product having a certain degree of elasticity and excellent strength, such as polypropylene. The air-conditioning case 11 is specifically composed of a plurality of divided cases. The plurality of divided cases accommodate the devices such as the heat exchangers 12 and 13 and a door described later, and then a fastening means such as a metal spring clip or a screw. Thus, the air conditioning unit 10 is configured as a single unit.

  The air conditioning unit 10 part is arranged in the form shown in FIG. 1 with respect to the front and rear, left and right and up and down directions of the vehicle in the substantially central part of the lower part of the instrument panel in the passenger compartment. An air inlet 14 is formed on the side portion. Air-conditioned air blown from the blower unit described above flows into the air inlet 14.

  In the air conditioning case 11, the evaporator 12 is disposed immediately after the air inlet 14. The evaporator 12 is arranged in the vertical direction so as to cross the passage in the air conditioning case 11 in a thin shape in the vehicle front-rear direction.

  Therefore, the blown air from the air inlet 14 flows into the front surface of the evaporator 12 extending in the vehicle vertical direction. As is well known, the evaporator 12 absorbs the latent heat of evaporation of the refrigerant in the refrigeration cycle from the conditioned air to cool the conditioned air.

  And the heater core 13 is arrange | positioned at predetermined intervals in the air flow downstream (vehicle rear side) of the evaporator 12. The heater core 13 is disposed on the lower side in the air conditioning case 11 so as to be inclined toward the rear side of the vehicle. The heater core 13 reheats the cold air that has passed through the evaporator 12, and hot water (engine cooling water) flows through the heater core 13 and heats the air using the hot water as a heat source.

  In the ventilation path in the air conditioning case 11, a cold air bypass passage 15 that bypasses the heater core 13 and flows cool air and a hot air passage 18 that flows through the heater core 13 and flows warm air are provided above the heater core 13. Is formed.

  In each of the cold air bypass passage 15 and the hot air passage 18, flat air that adjusts the mixing ratio of the hot air heated by the heater core 13 and the cold air that bypasses the heater core 13 through the cold air bypass passage 15. A mix door 16 is arranged.

  Here, the air mix door 16 is integrally coupled to a rotating shaft 17 disposed in the horizontal direction, and can be rotated together with the rotating shaft 17 in the vehicle vertical direction. The air mix door 16 serves as a temperature adjusting means for adjusting the temperature of air blown into the passenger compartment by adjusting the mixing ratio.

  Further, the rotation shaft 17 is rotatably supported by the air conditioning case 11, and one end portion of the rotation shaft 17 protrudes outside the air conditioning case 11 and is coupled to a link mechanism (not shown) to control the temperature of the air conditioner. It is rotated by a mechanism (an actuator such as a servo motor).

  The air mix door 16 has a resin or metal door base plate united integrally with the rotary shaft 17, and has a structure in which an elastic sealing material such as urethane foam is attached to both front and back surfaces of the base plate unit. It is.

  In the air conditioning case 11, a wall surface 19 that extends in the vertical direction with a predetermined interval from the heater core 13 is integrally formed in the air conditioning case 11 on the downstream side of the heater core 13 (on the vehicle rear side). Yes. The wall 19 guides the warm air upward through the warm air passage 18 immediately after the heater core 13.

  In the air conditioning case 11, an air mixing unit 20 that mixes cold air and hot air is formed on the air downstream side (upper side) of the cold air bypass passage 15 and the hot air passage 18. And in the downstream end of the air mixing part 20, and the upper part of the air-conditioning case 11, the defroster opening part 21 which is a blowing opening part is formed in the site | part of the vehicle front side opening in the vehicle front direction upper side. .

  The defroster opening 21 is supplied with temperature-controlled conditioned air from the air mixing unit 20, and is connected to a defroster outlet through a defroster duct (not shown). Blow out the air-conditioned air.

  The defroster opening 21 is opened and closed by a defroster door 22 which is a flat door means. The defroster door 22 is installed on the upstream side of the defroster opening 21, and is rotatable by a rotation shaft 23 that is disposed in the vicinity of the upper surface of the air conditioning case 11 and adjacent to the upper end of the defroster opening 21 in the horizontal direction. It is supported by.

  Next, a face opening 24 which is a blow-off opening is formed at a position on the rear side of the vehicle (close to the occupant) with respect to the defroster opening 21, and temperature-controlled conditioned air is mixed into the face opening 24. It flows in through the section 20.

  Further, the face opening 24 is connected to a face air outlet disposed on the upper side of the central portion of the instrument panel through a face duct (not shown), and from the air outlet to the passenger's head in the center of the passenger compartment. Blow out the conditioned air.

  The face opening 24 is opened and closed by a face foot door 25 which is a flat door means. The face foot door 25 is installed on the upstream side of the face opening 24 and is rotatably supported by a rotating shaft 26 arranged in the horizontal direction. The face foot door 25 is rotated so as to close either the face opening 24 or the foot opening 27 (described later).

  Next, in the air conditioning case 11, a foot opening 27 is opened at a site on the vehicle rear side from the operation range of the face foot door 25. Air-conditioned air whose temperature is controlled from the air mixing unit 20 flows into the foot opening 27. A foot passage (not shown) is formed on the air downstream side of the foot opening 27, and a front seat foot passage is opened at a midway portion of the foot passage.

  Air-conditioned air from the front-seat foot passage blows out to the feet of the front-seat passengers through a front-seat foot duct (not shown) and a front-seat foot outlet. Further, a rear seat foot duct (not shown) and a rear seat foot outlet are connected to the end portion of the foot passage, and the wind is blown out to the passenger's feet in the rear seat through the rear seat foot outlet. The foot opening 27 is opened and closed by the face foot door 25 described above.

  In addition, the defroster door 22 and the face foot door 25 have one end portions of the rotation shafts 23 and 26 protruding outside the air conditioning case 11 and connected to a link mechanism (not shown), so that a blow mode switching mechanism (an actuator such as a servo motor) is provided. ) Can be linked and operated.

  Here, as shown in FIG. 2, the defroster door 22 and the face foot door 25 have door substrate portions 22 a and 25 a made of resin such as polypropylene formed integrally with the rotary shafts 23 and 26. In this structure, elastic sealing materials 22b and 25b such as urethane foam are attached to both front and back surfaces of the substrate portions 22a and 25a.

  The door substrate portions 22a and 25a are members that perform the opening and closing action of the air passage that leads to the opening. 2 shows the entire configuration of the face foot door 25, the defroster door 22 is also formed in the same shape as the face foot door 25.

  Further, the defroster door 22 is a blowing mode switching door means for opening and closing a ventilation path communicating with the defroster opening 21, the face opening 24 and the foot opening 27, and closes the defroster opening 21 to close the face opening 24 and The ventilation path communicating with the foot opening 27 is opened, or the defroster opening 21 is opened and the ventilation path communicating with the face opening 24 and the foot opening 27 is closed.

  One face foot door 25 closes the face opening 24 and opens a ventilation path leading to the foot opening 27, or opens the face opening 24 and blocks the ventilation path leading to the foot opening 27. To be operated.

  Further, according to the blowing mode, the defroster door 22 is operated so as to open a ventilation path that leads to the defroster opening 21, the face opening 24, and the foot opening 27, and the face foot door 25 is connected to the face opening 24. It operates so that the ventilation path which leads to the foot opening part 27 may be opened.

  By the way, in these doors 22 and 25, when the heating operation is closed, that is, in the blowing mode, for example, in the foot defroster mode in which the foot opening 27 and the defroster opening 21 are opened, the face foot door 25 is The position is controlled to close the face opening 24 (see FIG. 1).

  At this time, if the cold air bypass passage 15 is closed by the air mix door 16, the warm air that has passed through the heater core 13 flows into the ventilation path that leads from the air mixing unit 20 to the foot opening 27. Thereby, the warm air that has passed through the heater core 13 flows on one side of the face foot door 25.

  In other words, as shown in FIG. 3, one side of the face foot door 25 is exposed to the high temperature side, and the other side is exposed to the low temperature side. That is, a temperature difference occurs between the front and back surfaces of the face foot door 25, and the high temperature side surface expands compared to the low temperature side surface due to this temperature difference, and thus the entire face foot door 25 undergoes thermal deformation such as warping. Incidentally, when the high temperature side is about 40 ° C. and the low temperature side is about 15 ° C., the amount of deformation becomes large when the temperature difference is 25 ° C. or more. As a result, there is a problem that wind leakage occurs in the face opening 24.

  Therefore, in this embodiment, the face foot door 25 is formed in a shape that suppresses thermal deformation due to a temperature difference. More specifically, as shown in FIG. 4, the low temperature side surface of the door substrate portion 25a is formed in a planar shape, and the high temperature side surface of the door substrate portion 25a is formed in an uneven shape. . That is, by forming a plurality of concave grooves on the high temperature side surface, the entire surface becomes uneven.

  As a result, when a temperature difference occurs between the front and back of the face foot door 25, the surface on the high temperature side expands in the X direction shown in the figure, but the expanded dimension is absorbed by the concave groove, so that the total length on the high temperature side is almost It does not change. As a result, the entire thermal deformation of the door substrate portion 25a can be suppressed, and wind leakage due to the thermal deformation can be prevented.

  According to this, when the blowing mode is the foot defroster mode, it is possible to prevent wind leakage due to thermal deformation to the face opening 24 during the closing operation in which the face foot door 25 closes the face opening 24.

  In the present embodiment, the concavo-convex shape is formed in the short side direction of the door substrate portion 25a. However, the shape is not limited to this, and may be formed in the long side direction of the door substrate portion 25a. Furthermore, the entire surface may be formed in a concavo-convex shape by forming concave grooves in a lattice shape on the surface of the door substrate portion 25a.

  On the other hand, in the defroster door 22, as with the face foot door 25, one surface on the high temperature side may be formed in an uneven shape. According to this, when the blowing mode is the defroster mode, the defroster door 22 opens the defroster opening 21 and closes the ventilation path leading to the face opening 24 and the foot opening 27 during the closing operation. Wind leakage due to thermal deformation to the opening 24 and the foot opening 27 can be prevented.

  According to the ventilation path switching device applied to the vehicle air conditioner according to the first embodiment described above, the defroster door 22 and the face foot door 25 have the door substrate portions 22a and 25a and the rotation shafts 23 and 26 that perform the opening / closing action. Are integrally formed, and one side of the door substrate portions 22a and 25a is formed in an uneven shape.

  According to this, although expansion | swelling by temperature generate | occur | produces in the single side | surface of door board | substrate part 22a, 25a, the expansion | swelling part can be absorbed by a concave groove part. Thereby, thermal deformation, such as curvature, does not occur because the entire amount of thermal deformation can be suppressed. Therefore, it is possible to prevent wind leakage at the seal portion.

(Second Embodiment)
In the first embodiment described above, one side of the defroster door 22 and the face foot door 25 is formed in an uneven shape. However, the present invention is not limited to this, and specifically, as shown in FIG. The surface on the low temperature side is formed in a planar shape, and the surface on the high temperature side of the door substrate portion 25a is formed in a substantially mountain shape.

  That is, by forming a plurality of substantially mountain-shaped convex portions on the surface on the high temperature side of the door substrate portion 25a, the entire surface becomes a bumpy shape of a mountain valley. As a result, when a temperature difference occurs between the front and back surfaces of the face foot door 25, the surface on the high temperature side expands in the X direction shown in FIG. That is, expansion on the high temperature side is greatly suppressed. As a result, the entire thermal deformation of the door substrate portion 25a can be suppressed, and wind leakage due to the thermal deformation can be prevented.

(Third embodiment)
In the above embodiment, the defroster door 22 and the face foot door 25 are formed in a shape that suppresses thermal deformation due to a temperature difference between the front and back sides of the door, but the present invention is not limited to this, and the door substrate portions 22a and 25a and the rotation shaft 23 are formed. , 26 may be formed in a shape that does not cause a temperature difference at the base.

  If hot hot air locally collides with the vicinity of the rotary shafts 23 and 26 during the closing operation of the heating operation, as shown in FIG. 6, the door substrate portions 22a and 25a and the rotary shafts 23 and 26 In the base portion, internal stress may concentrate due to a temperature difference between the front and back of the base portion, causing thermal deformation. Therefore, in the present embodiment, the defroster door 22 and the face foot door 25 are formed in a shape in which stress is not concentrated on the base portion.

  Specifically, as shown in FIGS. 7 (a) and 7 (b), the air passage 25c is circulated so that the hot air on the high temperature side flows to the base portion on the low temperature side during the closing operation of the heating operation. It is formed in the vicinity of the moving shaft 26. More specifically, a part of the door base plate portion 25a is formed so as to cover the base portion on the low temperature side along the axial direction to form the air passage 25c, and the open end of the air passage 25c is on the high temperature side. The door substrate portion 25a is formed so as to open.

  Thereby, the surface of the base part on the low temperature side and the high temperature side communicate with each other. That is, the hot air on the high temperature side circulates on the surface of the base portion on the low temperature side. Therefore, a temperature difference of a predetermined temperature or more does not occur on the front and back of the base portion. That is, local thermal deformation near the base portion on the high temperature side does not occur. As a result, wind leakage due to thermal deformation can be prevented.

(Fourth embodiment)
In the above embodiment, the defroster door 22 and the face foot door 25 are formed in a shape that suppresses thermal deformation due to a temperature difference. However, the present invention is not limited thereto, and the defroster door 22 and the face are made of a material that suppresses thermal deformation. The foot door 25 may be formed.

  More specifically, when the temperature difference between the defroster door 22 and the face foot door 25 exceeds a predetermined temperature, the shape of the shape memory alloy or shape memory resin in which the door substrate portions 22a and 25a are set to close the ventilation path. The shape memory material is used.

  The face foot door 25 is formed by setting the face opening 24 to a closed position in the temperature range of, for example, about 40 ° C. or higher. In addition, the defroster door 22 is formed in a warm state, for example, in a temperature range of about 40 ° C. or more, so that the ventilation path that leads to the face opening 24 and the foot opening 27 is set to a closed position. .

  According to this, even when a temperature difference occurs during the closing operation of the heating operation, thermal deformation such as warpage due to the temperature difference does not occur when the temperature on the high temperature side exceeds the predetermined temperature. Therefore, it is possible to prevent wind leakage at the seal portion.

  Further, by forming the defroster door 22 and the face foot door 25 with a shape memory material such as a shape memory resin or a shape memory alloy, the ventilation path leading to the face opening 24 and the foot opening 27 is blocked according to a predetermined temperature. It can be easily formed into a shape.

(Other embodiments)
In the above embodiment, the present invention is applied to the air conditioning case 11 of the vehicle air conditioner. However, the present invention is not limited to this, and the present invention is also applied to the ventilation path switching device other than the air conditioning case 11 of the vehicle air conditioner. it can.

It is a schematic diagram which shows the whole structure of the air-conditioning case 11 of the vehicle air conditioner in 1st Embodiment of this invention. It is a perspective view which shows the whole structure of the face foot door 25 in 1st Embodiment of this invention. It is explanatory drawing which shows an example of the thermal deformation by the temperature difference of the face foot door 25 in 1st Embodiment of this invention. It is a longitudinal cross-sectional view which shows the shape of the face foot door 25 in 1st Embodiment of this invention. It is a longitudinal cross-sectional view which shows the shape of the face foot door 25 in 2nd Embodiment of this invention. It is explanatory drawing which shows an example of the thermal deformation by the temperature difference of the face foot door 25 in 3rd Embodiment of this invention. (A) is a longitudinal cross-sectional view which shows the shape of the face foot door 25 in 3rd Embodiment of this invention, (b) is a bottom view.

Explanation of symbols

11 ... Air-conditioning case, case 21 ... Defroster opening (blowing opening)
22. Defroster door (door means)
22a ... Door substrate part 23 ... Rotating shaft 24 ... Face opening (blow-off opening)
25 ... Face foot door (door means)
25a ... Door board part 26 ... Rotating shaft

Claims (8)

In a ventilation path switching device having rotating shafts (23, 26) whose both ends are rotatably supported by a case (11) forming a ventilation path, and comprising door means (22, 25) for opening and closing the ventilation path. ,
The door means (22, 25) is formed in either a shape or a material capable of suppressing thermal deformation due to a temperature difference between the front and back of the door means (22, 25) during the closing operation. Ventilation path switching device characterized by being made. In the door means (22, 25), a flat door substrate portion (22a, 25a) that performs an opening / closing action and the rotating shaft (23, 26) are integrally formed,
The ventilation path switching device according to claim 1, wherein the door substrate portion (22a, 25a) is formed in an uneven shape on one side. In the door means (22, 25), a flat door substrate portion (22a, 25a) that performs an opening / closing action and the rotating shaft (23, 26) are integrally formed,
The ventilation path switching device according to claim 1, wherein the door substrate portion (22a, 25a) is formed in a substantially mountain shape on one side.   In the door means (22, 25), flat door substrate portions (22a, 25a) that perform an opening / closing action and the rotation shafts (23, 26) are integrally formed, and air on the upstream side of the ventilation path is formed. The ventilating device according to claim 1, wherein the airflow passage is formed so as to circulate to a root portion on the downstream side of the airflow path between the door base plate portion (22a, 25a) and the rotating shaft (23, 26). Road switching device.   In the door means (22, 25), flat door substrate portions (22a, 25a) that perform an opening / closing action and the rotating shafts (23, 26) are integrally formed, and the temperature difference is a predetermined temperature. The ventilation path switching device according to claim 1, wherein the door substrate portion (22 a, 25 a) is formed of a shape memory material set to a shape that closes the ventilation path when the pressure exceeds the upper limit.   The ventilation path switching device according to claim 5, wherein the shape memory material is a shape memory resin.   The ventilation path switching device according to claim 5, wherein the shape memory material is a shape memory alloy. The case (11) is an air conditioning case (11) configured in a vehicle air conditioner,
The said door means (22, 25) is arrange | positioned by the ventilation path upstream of the blowing opening part (21, 24) formed in the said air-conditioning case (11). The ventilation path switching apparatus as described in any one of Claims 7.

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