JPH0976726A - Air conditioning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent self-excited vibration of a door. SOLUTION: A door device 1 provided on the upper stream side of a heater core is constituted of a rotary shaft 10 rotationally movably supported with a case and an air mix door 8. A packing 12 made of urethane is provided on the extreme end part of the upper face of the air mix door 8. Meanwhile, a rib 15 is projectingly provided on the upper wall 16 of the case so as to fit in the packing 12. However, an angle formed by a seal face and a plate face is formed in the range to be about 15 degrees. In the range in which an angle formed by the seal face and the plate face is smaller than about 10 degrees and self-excited vibration is apt to generate, the rib 15 is fitted in the packing 12 so as to hold the air mix door 8, and hence self-excited vibration is prevented from generating. As a result, the abnormal sound due to self-excited vibration is prevented from generating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner in which a door having a substantially flat plate shape rotates to open and close an opening, and in particular, the pressure between a space on the windward side and a space on the leeward side of the door. The present invention relates to an air conditioner capable of preventing self-excited vibration that occurs due to a difference pulsation.

[0002]

2. Description of the Related Art Conventionally, as an example of a door device used in a vehicle air conditioner, for example, as shown in FIG. 1, a substantially flat air mix door 8 rotatably supported by a case 2 is used as a heater core. The one provided on the upstream side of 7 is known. The air mix door 8 is positioned so as to close the cold air passage opening 13 at the time of maximum heating, while it is positioned so as to close the ventilation surface of the heater core 7, which is the warm air passage opening at the time of maximum cooling. By rotating,
The ratio of the amount of air that has passed through the evaporator 6 and that has been cooled and that has passed through the heater core 7 is adjusted.

In the door device having such a structure,
It is known that the air mix door 8 generates self-excited vibration depending on the balance of the force applied to the air mix door 8 during air blowing. For example, in an air conditioner having a layout as shown in FIG. 1, the heater core 7 having ventilation resistance at a position where the cold air passage opening 13 is slightly opened, that is, the air mix door 8 has a minute angle smaller than the position at the time of maximum heating.
At the position rotated to the side, the air passing through the evaporator 6 vigorously flows into the cold air passage 20a having less ventilation resistance, and the wind speed of the air passing through the small gap between the seal surface 14 and the air mix door 8 is increased. Will increase. As a result, the pressure on the leeward side of the air mix door 8 is reduced by the air passing through the small gap between the sealing surface 14 and the air mix door 8, and the air mix door 8 is closed by the cold air passage opening portion 13.
Is sucked in the closing direction. However, when the air mix door 8 closes the cold air passage opening 13, the force to suck the air mix door 8 toward the cold air passage opening 13 disappears, and the air mix door 8 returns to the original position. By repeating such an operation within a minute time, the pressure difference between the space on the leeward side and the space on the leeward side of the air mix door 8 pulsates. Further, due to the pulsation of the wind speed, the air mix door 8 becomes unstable and self-excited vibration is generated. It is empirically known that the self-excited vibration is likely to occur when the angle formed by the cold air passage opening 13 and the plate surface of the air mix door is 10 degrees or less.

The occurrence of such self-excited vibration causes a problem that abnormal noise is generated during the operation of the door device. In order to solve such a problem, conventionally, a door device 19 having a structure as shown in FIGS. 6 to 9 is known. The door device 19 is composed of a rotary shaft 10 rotatably supported by the case 2 and an air mix door 8 connected to the rotary shaft 10, and the plate surface of the upper tip of the air mix door 8 is thick. A packing 21 made of an elastic material such as urethane having a surface area of about 3 to 6 mm and a surface area of about ² to 3 cm ² is provided. On the other hand, the case 2 is provided with a rib 22 having a height of 3 to 6 mm extending toward the air mix door 8 together with the sealing surface 14 around the upper wall 16 and the cold air passage opening 13. The rib 22 is formed on the seal surface 14 at a position facing the packing 21.

With the door device 19 having such a structure, the air-mix door 8 is at a position rotated toward the heater core 7 by a minute angle from the position at the time of maximum heating, that is, self-excited vibration occurs. Rib 2 when in range
2 is fitted into the packing 21 by about 2 to 3 mm, and the air mix door 8 is held. Therefore, it is said that self-excited vibration can be prevented and abnormal noise can be prevented.

[0006]

By the way, as the air mix door 8 used in such a door device 19, there is one in which a urethane material 8b is attached to both surfaces of a thin plate plate 8a made of metal or resin. Used. However, when the air mix door 8 is distorted in the rotation direction due to variations in the plate thickness of the plate 8a or the urethane material 8b, or the warp of the plate surface of the air mix door 8, the air mix door 8 vibrates by itself. When it is in the region where the occurrence of, the contact amount between the packing 21 and the rib 22 decreases,
There was a possibility that the force holding the air mix door 8 would decrease. As a result, there is a problem in that the air mix door 8 cannot be held and self-excited vibration cannot be prevented.

Further, since the packing 21 has a fairly small area of about ² to 3 cm ² , there is a problem that high dimensional accuracy is required for the installation position of the packing 21 and the formation position of the rib 22. Furthermore, since the rib 22 is formed so as to project toward the air mix door 8 with respect to the sealing surface 14 that is flush with the cold air passage opening 13, the packing 21 and the rib 22 interfere during the maximum heating,
The air mix door 8 and the sealing surface 14 cannot be brought into close contact with each other. Therefore, there is also a problem that air leakage to the cold air passage 20a occurs, which causes problems such as a reduction in heating capacity and fogging of the windshield.

Therefore, the present invention has been made in view of the above points, and it is an object of the present invention to provide a door device capable of preventing self-excited vibration without being affected by a distortion generated in a door rotating direction. It is what

[0009]

In order to solve the above-mentioned problems, claims 1 to 7 claim the rotary shaft (1) of the door (8).
0), the elastic member (12) provided on one of the wall surface (16) of the case (2) facing the end portion of the door in the axial direction, and the position facing the elastic member. The self-excited door, which has the projection (15) provided and is provided on the wall surface of the case, is caused by the pulsation of the pressure difference between the space on the windward side and the space on the leeward side of the door. The technical means of being provided along the rotation direction of the door over a range (θ ₂ ) wider than the range (θ ₁ ) in which vibration is generated is adopted.

When the door is gradually rotated from the position where the door closes the opening and the door is located at the position where the opening is slightly opened, a slight difference between the plate surface of the door and the opening plane of the opening is provided. Air forcefully flows from the windward side of the door to the leeward side through the gap, and as a result, the pressure in the space on the leeward side of the door decreases, and the pressure difference between the space on the leeward side and the space on the leeward side of the door. Will increase. Since the pressure in the space on the leeward side of the door is reduced, the door is sucked to the leeward side and is in the same state as when the opening is closed. When the opening is in the same state as when it is closed, the force to suck the door to the leeward side disappears, and the door returns to the original position, that is, the position where the opening is slightly opened. By repeating such an operation within a minute time, the pressure difference between the space on the windward side and the space on the leeward side of the door pulsates. Furthermore, the pulsation of the wind speed is applied, the door becomes unstable, and self-excited vibration occurs.

According to the first to seventh aspects of the invention, since either the elastic member or the protrusion is formed in a range wider than the range where the self-excited vibration occurs on the wall surface of the case, the self-excited vibration is generated. Within the range of occurrence, the protrusions fit into the opposing elastic members. Therefore, the vibration of the door is absorbed by the elastic member, and the door is held.
The occurrence of self-excited vibration is prevented. Therefore, generation of abnormal noise due to occurrence of self-excited vibration is prevented. Further, since either the elastic member or the protrusion is provided at the end of the door in the axial direction of the rotating shaft, the door cannot rotate due to variations in the thickness of the door that occur when molding the door. The door can be held without being affected by the distortion in the direction. Furthermore, since the door and the opening can be brought into close contact with each other, air leakage can be prevented.

The invention of claim 2 is the elastic member (1
2) is provided at the end of the door (8), and the protrusion (15) is on the windward side of the door and on the leeward side of the wall surface (16) of the case (2) facing the elastic member. Over a range (θ ₂ ) wider than the range (θ ₁ ) where the self-excited vibration of the door caused by the pulsation of the pressure difference with the space occurs,
The technical means of providing along the turning direction of the door is adopted.

According to the second aspect of the present invention, since the protrusion is provided on the wall surface of the case, it can be formed by integral molding with the case and can be easily manufactured. further,
According to the invention of claim 3, the warm air passage opening formed on the most upstream side of the warm air passage (20b) in which the heater core (7) is arranged, and the most upstream side of the cold air passage (20a) bypassing the heater core. In an air conditioner (1) in which an air mix door (8) for opening and closing the formed cold air passage opening (13) is provided on the upstream side of a heater core, an end portion of the air mix door in the axial direction of the rotating shaft (10). Or the wall surface (16) of the case (2) facing the end of the air mix door
The elastic member (12) provided on either one of the above and the protrusion (15) provided at a position facing the elastic member, and the elastic member or the protrusion provided on the wall surface of the case is the air mix. The range of the air mix door is wider (θ ₂ ) than the range (θ ₁ ) where the self-excited vibration of the air mix door caused by the pulsation of the pressure difference between the windward side space and the leeward side space is generated. The technical means of being provided along the moving direction is adopted.

Since the heater core is arranged in the hot air passage, the cold air passage opening has less ventilation resistance than the warm air passage opening. Therefore, it is arranged on the upstream side of the heater core,
Air mix door that opens and closes the hot air passage and the cold air passage,
When the cold air passage opening is rotated to a slightly open position,
The air vigorously flows from the windward side of the air mix door to the leeward side through a slight gap between the plate surface of the air mix door and the cold air passage opening. As a result, the self-excited vibration of the air mix door occurs due to the factors described above.

According to the third aspect of the invention, the elastic member or the protrusion provided on the wall surface of the case covers a range wider than the range in which the self-excited vibration of the air mix door occurs.
Since it is formed along the rotation direction of the air mix door, the self-excited vibration of the air mix door is prevented by the same operation as in the first aspect. Further, in the invention of claim 4, in particular, a technical means is adopted in which the elastic member (12) or the protrusion (15) is provided in the vicinity of the radial end of the door (8).

According to the fourth aspect of the present invention, the elastic member or the protrusion is provided at the front end of the door in the radial direction, whereby the force required to hold the door can be reduced. Further, in the invention of claim 5, particularly, the case (2)
The wall surface (16) of the elastic member (12) or the projection (1
A technical means is adopted in which the range in which 5) is provided is set to 10 degrees or more in the rotation direction of the door from the position where the door (8) closes the opening (13).

It is empirically known that self-excited vibration occurs in a range smaller than 10 degrees in the direction of rotation of the door from the position where the door closes the opening. Therefore, according to the fifth aspect of the invention, since either the elastic member or the protrusion is provided on the wall surface of the case in a range wider than the range in which the self-excited vibration occurs, the self-excited vibration can be prevented. .

Further, according to the invention of claim 6, in particular, the portion of the projection (15) farthest from the opening (13) in the direction of rotation of the door (8) has a rounded shape. It adopts the objective means. According to the sixth aspect of the present invention, by forming the protrusion into such a shape, when the door rotates in the direction of closing the opening, the portion of the protrusion that is farthest from the opening is the elastic member. It is possible to prevent the elastic member from being caught on, and it is possible to improve the durability of the elastic member.

Further, in the invention of claim 7, in particular, a technical means is adopted in which a displacement preventing member (11) for preventing axial displacement of the rotary shaft (10) of the door (8) is provided on the rotary shaft. It is a thing. According to the invention of claim 7,
Since the displacement prevention member can prevent displacement of the door rotation shaft in the axial direction, the protrusion can be reliably fitted into the elastic member.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention when applied to a door device arranged in a vehicle air conditioner will be described below with reference to the drawings. FIG. 1 is an overall schematic configuration diagram of a vehicle air conditioner 18. Vehicle air conditioner 18
Is composed of a case 2 made of a resin such as polypropylene, and an air conditioning functional component arranged inside the case 2.

The case 2 has an inside air intake port 3a for intake of air inside the vehicle interior and an outside air intake port 3b for intake of air outside the vehicle interior, and the inside / outside air switching door 4 is provided on the most upstream side of the case 2.
Thus, the inside / outside air switching device 3 for selecting whether the air taken into the case 2 is the inside air or the outside air is arranged. Further, a blower 5 for generating an air flow in the case 2 is arranged at a portion downstream of the inside / outside air switching device 3. When the blower 5 rotates, the inside air or the outside air is sucked into the case 2 through the inside air intake port 3a or the outside air intake port 3b, and an air flow toward the vehicle interior is generated.

An evaporator 6 for cooling the air passing therethrough is disposed in a portion of the case 2 downstream of the blower 5. The evaporator 6 constitutes a refrigeration cycle by being pipe-connected to a condenser, a compressor, a liquid tank and an expansion valve, which are not shown, and is erected so as to substantially close the passage cross section of the case 2. The air taken in by the blower 5 flows in the direction of the evaporator 6.

A portion of the case 2 downstream of the evaporator 6 is branched into a cold air passage 20a and a warm air passage 20b, and a portion of each passage on the uppermost stream side of the air flow is heated. An air passage opening and a cold air passage opening 13 are formed. The air that has passed through the evaporator 6 flows into the cold air passage 20a and the warm air passage 20b through these openings.

In the hot air passage 20b, a heater core 7 of a hot water heater that uses the cooling water (hot water) of the automobile engine as a heat source is provided upright so that the passage cross section is almost closed. The surface is the warm air passage opening described above. On the other hand, the cold air passage 20a is connected to the heater core 7
Is formed so as to detour around, and a cold air passage opening 13 is formed on the uppermost stream side thereof. This cold air passage opening 1
A sealing surface 14 that contacts the air mix door 8 to be described later is formed as a part of the case 2 around the area 3 during maximum heating.

Further, on the upstream side of the heater core 7, there is provided a door device 1 which allows the air flowing into the cool air passage 20a and the air flowing into the warm air passage 20b to flow in at a desired ratio. The door device 1 will be described in detail later. An air mixing unit for mixing the cold air passing through the cold air passage 20a and the hot air passing through the warm air passage 20b is provided in a portion of the case 2 downstream of the cold air passage 20a and the warm air passage 20b. The air conditioning temperature can be adjusted. Further, a communication duct is formed on the downstream side of the air mixing portion, and an air outlet 9 for blowing out the air whose temperature is adjusted to the air is opened on the downstream side of the communication duct. .

As shown in FIGS. 2 to 5, the door device 1 includes a rotating shaft 10 rotatably supported by the case 2 and an air mix door 8 having one end connected to the rotating shaft 10.
And drive means (not shown) for rotating the rotary shaft 10. The end of the rotary shaft 10 has an insertion hole 16 a formed in the upper wall 16 of the case 2 and a lower wall 17 of the case 2.
The rotary shaft 10 is supported by the case 2 such that the longitudinal direction of the rotary shaft 10 is the vertical direction by being inserted into the insertion holes 17a formed in the case 2.

The air mix door 8 is composed of a thin plate plate 8a made of resin and urethane materials 8b mounted on both sides of the plate 8a. One end of the air mix door 8 is connected to the rotary shaft 10 and rotates about the rotary shaft 10. By rotating the air mix door 8, the cold air passage opening 13 and the warm air passage opening, which is the ventilation surface of the heater core 7, are opened and closed. The air mix door 8 is rotated so that the plate surface of the air mix door 8 is positioned so as to close the cold air passage opening 13 during maximum heating and the position where the warm air opening is closed during maximum cooling. Move.

A packing 12 made of urethane, which is an elastic member, is provided on the upper surface of the air mix door 8, which is an end portion of the air mix door 8 in the axial direction of the rotary shaft 10. The packing 12 is provided on a portion of the upper surface of the air mix door 8 which serves as a distal end portion in the radial direction when the air mix door 8 rotates. Further, at a portion of the upper wall 16 of the case 2 facing the packing 12 when the air mix door 8 rotates, a rib 15 that is a protruding portion that protrudes to the air mix door 8 side, that is, the lower side, It is formed integrally with the case 2. The ribs 15 are arranged so that the angle formed by the sealing surface 14 and the plate surface of the plate 8a is about 15 degrees.
To the rotated position (range represented by θ ₂ in the figure),
It is formed along the rotation direction of the air mix door 8. The end of the rib 15 on the side away from the sealing surface 14 is chamfered and has a rounded shape.

The rib 15 is formed at a portion facing the packing 12 when the air mix door 8 is rotated, and has a height such that it fits into the packing 12 by about 2 to 3 mm. A ring-shaped donut packing 11, which is a displacement preventing means, is inserted between the upper surface of the air mix door 8 and the upper wall 16 of the rotary shaft 10.

Next, the operation of this embodiment will be described.
The air in the vehicle compartment sucked from the inside air suction port 3a or the air outside the vehicle compartment sucked in from the outside air suction port 3b is blown by the blower 5
Then, it passes through the evaporator 6 and is cooled. The air that has passed through the evaporator 6 is cooled by the cold air passage 20a according to the operating position of the air mix door 8 of the door device 1.
And the hot air passage 20b are distributed to the cold air passage 20a and the hot air passage 20b.

Next, the prevention of self-excited vibration of the air mix door 8 which occurs when the air mix door 8 is at a position where the cold air passage opening 13 with less ventilation resistance is slightly opened will be described. In a door device that opens and closes two openings with different ventilation resistance, the air mix door is located at a position where the opening with less ventilation resistance is slightly opened, as described below. It is known that doors generate self-excited vibration.

When the air mix door is at a position where the opening of the cold air passage is slightly opened, the cold air passage opening has less ventilation resistance than the ventilation surface of the heater core, which is the opening of the warm air passage. The air that has passed through the evaporator flows in vigorously. As a result, the pressure in the space on the leeward side of the air mix door is reduced, and the air mix door is sucked toward the cold air passage opening side. As a result, the state is the same as when the cold air passage opening is closed. When the cold air passage opening is the same as when it is closed, there is no force to suck the tip, and the air mix door returns to its original position. By repeating such a state within a minute time, the air-mix door generates self-excited vibration. The pressure difference between the space on the windward side and the space on the leeward side of the air mix door pulsates. Furthermore, the pulsation of the wind speed is applied, the air mix door becomes unstable, and self-excited vibration occurs. It is empirically known that self-excited vibration is likely to occur when the angle formed by the cold air passage opening and the plate surface of the air mix door is smaller than 10 degrees (range represented by θ ₁ in FIG. 4). There is.

However, in the embodiment of the present invention,
The range in which self-excited vibration is likely to occur as described above (θ in FIG. 4)
_The rib 15 is formed in a wider range (the range represented by θ ₂ in FIG. 4) than the range represented by ₁ .
In the range where self-excited vibration is likely to occur, the rib 15 is fitted into the packing 12, so that the air mix door 8 is held and the occurrence of self-excited vibration can be prevented. As a result, it is possible to prevent generation of abnormal noise due to self-excited vibration.

Further, in the conventional example, the packing 21 for holding the air mix door 8 is provided on the plate surface of the air mix door 8 in the region where the self-excited vibration is likely to occur. It is provided on the upper surface of the air mix door 8, which is the end of the air mix door 8 in the axial direction of the rotary shaft 10. Therefore, the air mix door 8 can be held without being affected by the distortion in the rotation direction of the air mix door 8, such as the variation in the plate thickness of the air mix door 8 and the warp of the plate surface. Further, since a member for preventing self-excited vibration unlike the conventional example is not provided between the air mix door 8 and the seal surface 14, the air mix door 8 and the seal surface 14 can be brought into close contact with each other. Therefore, it is possible to prevent air leakage to the cold air passage 20a. As a result, it is possible to prevent deterioration of the heating capacity and fogging of the windshield.

Further, since the packing 12 is provided at the distal end portion of the air mix door 8 in the radial direction, the self-excited vibration of the air mix door 8 can be prevented with a small holding force. Further, since the rib 15 is formed integrally with the case 2, it can be easily provided on the case 2 in the manufacturing process.

Further, since the end of the rib 15 farthest from the sealing surface 14 side is rounded and has a rounded shape, the air mix door 8 is provided with the heater core 7.
It is possible to prevent the packing 12 at the end of the rib 15 from being caught when the air-mixing door 8 is rotated from the position where the ventilation surface is closed to the cold-air passage opening 13, and to smoothly rotate the air-mix door 8. You can

Further, since the ring-shaped donut packing 11 is inserted between the upper surface of the air mix door 8 and the upper wall 16 of the rotary shaft 10, the donut packing 11 rotates the air mix door 8. The vertical movement of the air mix door 8 can be prevented at the time.
It is possible to prevent the packing 12 from being displaced due to the rotation, and the ribs 15 can be reliably fitted into the packing 12.

In the above-described embodiments, the packing is provided on the air mix door and the rib is provided on the case, but conversely, the packing may be provided on the case and the rib may be provided on the air mix door. The same effect can be obtained. Further, even if the shape of the air mix door is as described below, the same effect as that of the above-described embodiment can be obtained. That is, the air mix door has a groove formed on the upper surface in the same direction as the rotating direction of the air mix door, and a packing is provided inside the groove. On the other hand, the rib is formed in a range wider than the range in which the self-excited vibration is generated on the upper wall of the housing, as in the above-described embodiments, but the groove formed in the air mix door described above. It is fitted into the packing provided inside the groove.

Further, in the above-mentioned embodiments, the packing is provided at the tip of the upper surface of the air mix door, but the position where the packing is provided may be on the upper surface of the air mix door. The packing may be provided on the surface of the air mix door that is an end portion in the axial direction of the rotating shaft, or may be provided on the lower surface of the air mix door. Therefore,
The position where the packing is provided is not particularly limited in that sense.

Further, in the above-mentioned embodiment, the rib is integrally formed with the case, but the rib may be provided separately in the case or the air mix door. Further, in the above-described embodiment, the material of the air mix door is resin, but the material of the air mix door may be, for example, metal, and the material is not particularly limited. Similarly, the material of the packing and the rib is not particularly limited.

Further, in the above-described embodiment, the example in which the present invention is applied to the air mix door provided on the upstream side of the heater core is shown. However, for example, in a vehicle air conditioner, a foot outlet and a ventilation are provided. Even in a switching door that switches the ventilation direction with the face outlet that has less resistance, self-excited vibration occurs when the face outlet opens slightly, so it can be applied even with such a switching door Is.

Further, even in a door device which opens and closes an opening provided on the leeward side of the air passage by rotating, if the opening is slightly opened, the door and the opening are separated from each other. Air vigorously flows into the slight gap between the two, and the pressure difference between the space on the lee side and the space on the lee side of the door increases.
As a result, since self-excited vibration occurs as described above, the present invention can be applied to such a door. Therefore, the type of door to which the present invention is applied is not particularly limited.

Further, in the above-described embodiment, the upper wall of the case is formed in the range where the angle formed by the seal surface and the plate surface of the plate is about 15 degrees. Since the self-excited vibration is generated in the range where the angle formed by and is less than about 10 degrees, the rib is formed in a range wider than the range in which the self-excited vibration is generated, and the rib is formed. The range is not particularly limited. Also, when the packing is provided on the upper wall of the case, similarly, the range in which the packing is provided may be wider than the range in which self-excited vibration occurs, and the range in which the packing is provided is not particularly limited.

[Brief description of drawings]

FIG. 1 is an overall schematic configuration diagram of an air conditioner 18.

FIG. 2 is an enlarged view of a portion A of FIG. 1 of the case 2, and is a view of the door device 1 seen from above.

FIG. 3 is a view showing how the door device 1 is attached to the case 2.

FIG. 4 is a diagram showing an operating state of the door device 1.

FIG. 5 is a partially cutaway view showing a state where the door device 1 is attached to the case 2.

FIG. 6 is an enlarged view of part A in FIG. 1 of Case 2 in the conventional example, and is a view of the door device 19 as seen from above.

FIG. 7 is a diagram showing a state in which a door device 19 is attached to a case 2 in a conventional example.

FIG. 8 is a diagram showing an operating state of a door device 19 in a conventional example.

FIG. 9 is a view showing a state where the door device 19 is attached to the case 2 in the conventional example, and is a partially cutaway view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Door device 2 Case 8 Air mix door which is a door 10 Rotating shaft 12 Packing which is an elastic member 13 Cold air passage opening which is an opening 15 Rib which is a protrusion

Claims (7)

[Claims] 1. A case having an air passage formed therein, an opening formed in the case, a rotary shaft rotatably supported by the case, and one end of which is connected to the rotary shaft, A substantially flat plate-shaped door that rotates about the rotating shaft, a driving unit that rotates the rotating shaft, and an end of the door in the axial direction of the rotating shaft, or the end of the door. An elastic member provided on one of the wall surfaces of the case, and provided on the other of the wall surface of the case or the end portion of the door so as to face the elastic member, and faces the elastic member. The elastic member or the protrusion provided on the wall surface of the case, the pulsation of the pressure difference between the space on the windward side of the door and the space on the leeward side of the door. Said caused Over a wider range than the self-excited vibration of A occurs, the air conditioning apparatus characterized by being provided along the rotational direction of the door. 2. The elastic member is provided at the end of the door, and the protrusion is a space on the wall surface of the case facing the elastic member, which is the windward side of the door and the leeward side of the door. 2. The door is provided along the rotation direction of the door over a range wider than the range where the self-excited vibration of the door caused by the pulsation of the pressure difference between the door and the space. Air conditioner. 3. An evaporator arranged in the case for cooling passing air, and a warm air passage provided downstream of the evaporator with a heater core for heating the air passing through the evaporator, A hot air passage opening formed on the most upstream side of the hot air passage; a cold air passage bypassing the heater core; and a cold air passage opening formed on the most upstream side of the cold air passage, the door Is an air mix door disposed on the upstream side of the heater core and adjusting the opening ratio between the warm air passage opening and the cold air passage opening by rotating the door, and is provided on the wall surface of the case. The elastic member or the protrusion is caused by the pulsation of the pressure difference between the space on the windward side of the air mix door and the space on the leeward side of the air mix door. The air conditioner according to claim 1 or 2, wherein the air conditioner is provided along a rotation direction of the air mix door over a range wider than a range where self-excited vibration of the air mix door occurs. 4. The air conditioner according to any one of claims 1 to 3, wherein the elastic member or the protrusion is provided in the vicinity of a radial front end of the door. 5. A range in which one of the elastic member and the protrusion is provided on the wall surface of the case is 1 from the position where the door closes the opening in the rotation direction of the door.
The air conditioner according to any one of claims 1 to 4, wherein the air conditioner is set to 0 degrees or more. 6. The method according to claim 1, wherein a portion of the protrusion that is farthest from the opening in the direction of rotation of the door has a rounded shape. Air conditioner described. 7. The air conditioner according to any one of claims 1 to 6, wherein a displacement prevention member that prevents displacement of the door in the axial direction of the rotary shaft is provided on the rotary shaft.