JP2004314794A - Air passage opening/closing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air passage opening/closing device capable of sufficiently reducing abnormal sound. <P>SOLUTION: This device is constituted by arranging a projection part 34e for forming a wall surface inclined to a main flow direction of an air flow flowing in a gap of a seal seat part of a face opening part and a face door 34 in a truncated chevron shape. The air flow therefore can be more surely stirred as compared with an invention provided with a projection part (rib) constituting a wall surface parallel to the main flow direction of the air flow. As a result, since a vortex to be a cause of abnormal sound can be effectively sheared or extinguished, stable generation of the vortex to be the cause of abnormal sound by a prescribed period can be suppressed and abnormal sound can be surely reduced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an air passage opening and closing device for opening and closing an air passage, and is effective when applied to an air conditioner for a vehicle.
[0002]
[Prior art]
The air mix door and the opening and closing door that regulates the air volume adjust the air volume and air volume ratio by adjusting the opening area of the opening through which air circulates. Abnormal noise is likely to occur.
[0003]
That is, as shown in FIG. 11, when the opening degree of the opening / closing door a is small, the air flows through a relatively small gap (short distance) formed between the outer edge of the opening b and the opening / closing door. Flows in a laminar flow state without moving to the opening, but in the air flow after passing through the opening and closing door, on the back side of the opening and closing door, a separation layer (separation flow) separated from the main flow is generated, and this separation layer is The vortex moves (progresses) downstream along with the main flow and collides with the outer edge of the opening.
[0004]
The pressure wave generated when the vortex collides with the outer edge reaches the back of the opening and closing door, and when the pressure wave reaches the back of the opening and closing door, the pressure wave separates again on the back of the opening and closing door. The separation layer becomes a vortex and moves (progresses) downstream along with the main flow. At this time, since the air flowing from the end of the opening / closing door toward the outer edge of the opening is in a laminar state, a vortex is stably generated at a predetermined cycle.
[0005]
In other words, when the opening degree of the opening / closing door is small, once a vortex is generated at the end of the opening / closing door, the vortex is generated stably at a predetermined cycle, so that abnormal noise is generated. For this reason, the frequency of the noise is a function of the flow rate of the air and the distance from the end of the door to the outer edge of the opening, and the level of the noise (noise level) is perpendicular to the paper surface of the vortex (the main flow direction). (In a direction perpendicular to the direction of the vortex) (hereinafter referred to as a vortex length).
[0006]
In addition, the vortex length mentioned here does not mean only the part where the vortex is completely continuous in the direction orthogonal to the flow direction of the main flow, the vortex may be cut off in the middle, and the noise is macroscopically abnormal. Means an area where the occurrence of the error occurs.
[0007]
On the other hand, as shown in FIG. 12, on the side of the air conditioning casing d forming the opening and the air passage, a wall surface parallel to the main flow direction of the air flow flowing through the gap between the outer edge of the opening and the opening / closing door. By providing the projections (ribs) c, the invention that suppresses the generation of a stable vortex that causes an abnormal flow and causes abnormal noise at a predetermined cycle and reduces the abnormal noise is provided. It is known (for example, see Patent Document 1).
[0008]
[Patent Document 1]
JP-A-9-66735
[Problems to be solved by the invention]
However, according to a test study by the inventor, the invention described in Patent Document 1 cannot sufficiently reduce abnormal noise.
[0010]
In view of the above points, the present invention firstly provides a novel air passage opening / closing device different from the conventional one, and secondly, aims to sufficiently reduce abnormal noise.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a casing (20) having an opening (20a) through which air flows and forming an air passage, and an opening (20a) are provided. A plate-like opening / closing door (34) for adjusting the opening area of the opening (20a), and a wall surface inclined with respect to the main flow direction of the air flow flowing through the gap between the outer edge (20b) of the opening (20a) and the opening / closing door (34). 34d).
[0012]
Thereby, the air flow can be more reliably disturbed as compared with the invention described in Patent Document 1 in which a projection (rib) forming a wall surface parallel to the main flow direction of the air flow is provided.
[0013]
Therefore, the vortex causing the abnormal noise can be effectively sheared or eliminated, so that the vortex causing the abnormal noise can be prevented from being stably generated at a predetermined cycle, and the abnormal noise can be reliably reduced. Can be reduced.
[0014]
According to the second aspect of the present invention, a plurality of wall surfaces (34d) are provided on a plane substantially parallel to the plate surface (34f) of the opening / closing door (34) in a direction substantially orthogonal to the main flow direction, Further, adjacent wall surfaces (34d) are arranged in a C shape so as to be substantially symmetric with respect to the mainstream direction.
[0015]
According to the third aspect of the present invention, a plurality of wall surfaces (34d) are provided in a plane substantially parallel to the plate surface (34f) of the opening / closing door (34) in a direction substantially orthogonal to the main flow direction. , Characterized in that the inclination directions of the adjacent wall surfaces (34d) are alternately reversed.
[0016]
According to a fourth aspect of the present invention, the projection (34e) is provided on the opening / closing door (34).
[0017]
Incidentally, reference numerals in parentheses of the above-mentioned units are examples showing the correspondence with specific units described in the embodiments described later.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
(1st Embodiment)
In the present embodiment, the air passage opening and closing device according to the present invention is applied to a vehicle air conditioner, and FIG. 1 is a schematic diagram of a vehicle air conditioner 10 according to the present embodiment.
[0019]
The compressor 13 obtains power from a traveling engine to suck and compress the refrigerant, the outdoor heat exchanger 14 exchanges heat between the refrigerant and the outside air to cool the refrigerant, and the decompressor 11 Is a pressure reducing means for reducing the pressure.
[0020]
The indoor heat exchanger 21 exchanges heat between the air blown into the room and the refrigerant, and the accumulator 12 separates the refrigerant flowing out of the indoor heat exchanger 21 into a liquid-phase refrigerant and a gas-phase refrigerant, and Is discharged to the suction side of the compressor 13 and stores a surplus refrigerant as a liquid-phase refrigerant.
[0021]
The four-way valve 15 is a switching valve for switching between a cooling operation, a dehumidifying cooling operation or a dehumidifying heating operation in which the refrigerant discharged from the compressor 13 flows to the outdoor heat exchanger 14 and a heating operation in which the refrigerant flows to the indoor heat exchanger 21. .
[0022]
The blower 22 is a blower that blows air into the vehicle interior. The air-conditioning casing 20 is a duct that accommodates the indoor heat exchanger 21 and forms an air passage through which the air that has passed through the indoor heat exchanger 21 flows.
[0023]
The heater 23 is heating means for heating air that is housed in the air-conditioning casing 20 on the downstream side of the air flow from the indoor heat exchanger 21 and blows out into the vehicle interior using engine cooling water as a heat source. Temperature adjusting means for adjusting the ratio of the amount of air passing through the heater and the flow of air flowing around the heater 23 to adjust the temperature of the air blown into the room.
[0024]
On the upstream side of the air flow of the blower 22, an inside / outside air switching door 32 for switching between an outside air mode for introducing outside air inside the vehicle and an inside air mode for introducing air inside the vehicle is provided, while the heater 23 and the air mixing door 31 are provided. On the downstream side of the air flow, there are provided blow mode control doors 33 to 35 for controlling the direction of air blown into the vehicle interior.
[0025]
The door 33 is a differential door that controls a differential mode by opening and closing a defroster opening that blows air toward the window glass, and a door 34 opens and closes a face opening that blows air toward the upper body of the occupant. The door 35 is a foot door for controlling the foot mode by opening and closing a foot opening for blowing air toward the lower body of the occupant.
[0026]
The present embodiment is an air passage opening / closing device in which the present invention is applied to the face door 34, and details thereof will be described later.
[0027]
The inside / outside air switching door 32, the doors 33 to 35, and the air mix door 31 are driven to open and close by a driving means such as a servo motor having a potentiometer integrated with the door position, and the electronic control unit (ECU) 1 , The servo motor and the blower 22 are controlled based on the output signal of the potentiometer and the like.
[0028]
The potentiometer 41 is a door position detecting means for detecting the door position of the inside / outside air switching door 32, the potentiometer 42a is a door position detecting means for detecting the door position of the differential door 33, and the potentiometer 42b is a door position of the face door 34. The potentiometer 42c is a door position detecting means for detecting the door position of the foot door 35.
[0029]
The oxygen sensor 24 is a refrigerant leak determination unit that detects the amount of refrigerant leaked indirectly by detecting the oxygen concentration of the air flowing in the air-conditioning casing 20. In the present embodiment, the oxygen sensor 24 Is determined to be equal to or less than a predetermined concentration, or when a sensor for detecting a vehicle collision (an acceleration sensor used for operating an airbag) detects a vehicle collision, refrigerant leaks into the air-conditioning casing 20. Is determined to be in a state that can be leaked or leaked.
[0030]
In the present embodiment, a flammable gas such as carbon dioxide or propane or hydrocarbon is used as the refrigerant, but it is needless to say that the present embodiment is not limited to this.
[0031]
The humidity sensor 25 detects the humidity of the air, and forms a fogging determination unit that determines whether or not the window glass in the vehicle compartment is in a state of being easily fogged. In the present embodiment, when the operation is switched from the cooling operation to the heating operation, after the defrosting operation is completed, or when there is a concern that water evaporation on the surface of the indoor heat exchanger 21 is in the early stage of the activation, or when the humidity sensor 25 has a predetermined value or more. When the humidity of the vehicle is detected, it is determined that the window glass in the vehicle compartment is in a state of being easily fogged.
[0032]
Incidentally, in the present embodiment, the oxygen sensor 24 and the humidity sensor 25 are provided inside and outside the air conditioning casing 20, but only one of them may be provided.
[0033]
Further, the refrigerant flows during the cooling operation, the dehumidifying cooling, and the dehumidifying heating are all flows indicated by solid arrows in FIG. 1, and the refrigerant flows in the heating operation and the defrosting operation are all indicated by wavy arrows in FIG. 1. This is the flow shown.
[0034]
Next, the face door 34, that is, the air passage opening / closing device according to the present embodiment will be described with reference to FIGS.
[0035]
2 is an enlarged view around the face door 34, and FIG. 3 is a perspective view of the face door 34 alone.
[0036]
As shown in FIG. 2, the face opening 20a of the air-conditioning casing 20 is provided with a seal seat 20b with which the outer edge of the face door 34 contacts, and the seal seat 20b is provided on the outer edge of the face opening 20a. Department.
[0037]
On the other hand, the face door 34 includes a substantially rectangular door body 34a, a lip seal 34b provided on an outer edge of the door body 34a and in contact with the seal seat 20b, and a shaft 34c for rotating the door body 34a. On the lip seal portion 34b side of the face door 34, the main flow direction of the air flow flowing in the gap between the seal seat portion 20b of the face opening portion 20a and the face door 34 (the direction of the arrow in FIG. 2). A plurality of protruding portions 34e constituting the inclined wall 34d (see FIG. 4) are provided.
[0038]
The lip seal portion 34b is made of an elastic material such as elastomer rubber which can be easily elastically deformed, and the door body portion 34a is a plate-shaped member having sufficiently higher rigidity than the lip seal portion 34b. In the embodiment, the lip seal portion 34b, the door body portion 34a, and the protrusion 34e are integrally formed by a two-color molding method or the like.
[0039]
Further, as shown in FIGS. 3 and 4, the plurality of protrusions 34e are arranged in a row in a direction substantially perpendicular to the main flow direction on a plane substantially parallel to the plate surface 34f of the face door 34. The adjacent wall surface 34d is provided in a C-shape so as to be substantially symmetric with respect to the mainstream direction.
[0040]
In other words, the plurality of protrusions 34e are arranged in a line in a direction substantially perpendicular to the main flow direction on a plane substantially parallel to the plate surface 34f of the face door 34, and the inclination of the adjacent wall surface 34d is set. It is integrally formed with the face door 34 so that the directions are alternately reversed.
[0041]
Incidentally, in the present embodiment, the specifications of the protrusion 34e (see FIG. 4), that is, the width a = 1 mm, the length b = 5 mm, the interval c = 15 mm, the angle d = 120 °, and the height e = 3 mm.
[0042]
Next, the operation and effect of the present embodiment will be described.
[0043]
As shown in FIG. 5, since a projection 34 e that forms a wall surface 34 d that is inclined with respect to the main flow direction of the air flow flowing through the gap between the seal seat portion 20 b of the face opening 20 a and the face door 34 is provided. The air flow can be more reliably disturbed as compared with the invention described in Patent Literature 1 in which a projection (rib) forming a wall surface parallel to the main flow direction of the flow is provided.
[0044]
Therefore, the vortex causing the abnormal noise can be effectively sheared or eliminated, so that the vortex causing the abnormal noise can be prevented from being stably generated at a predetermined cycle, and the abnormal noise can be reliably reduced. Can be reduced.
[0045]
FIG. 6 is a schematic diagram showing a case where a projection (rib) constituting a wall surface parallel to the main flow direction of the air flow is provided, that is, a state of generation of a vortex according to the invention described in Patent Document 1.
[0046]
(2nd Embodiment)
The height e of the protrusion 34e according to the first embodiment is constant. However, in the present embodiment, as shown in FIG. 7, the height e is lower on the lower side of the C-shape than on the upper side. Things.
[0047]
If the height e of the protrusion 34e is made different between the adjacent protrusions 34e, the vortex can be effectively sheared or eliminated.
[0048]
(Third embodiment)
In the second embodiment, the height e is lower on the lower side of the C-shape than on the upper side. However, in the present embodiment, as shown in FIG. It is higher than the upper side.
[0049]
Also in the present embodiment, if the height e of the protrusion 34e is different between the adjacent protrusions 34e, the vortex can be effectively sheared or eliminated.
[0050]
(Fourth embodiment)
In the second and third embodiments, the height e of the projection 34e is sequentially changed in the main flow direction. However, in the present embodiment, as shown in FIG. The height e of the portion 34e is changed so as to be the maximum.
[0051]
Also in the present embodiment, if the height e of the protrusion 34e is made different between the adjacent protrusions 34e, the vortex can be effectively sheared or eliminated.
[0052]
(Fifth embodiment)
In the fourth embodiment, the height e of the protrusion 34e is changed so as to be the maximum at the substantially central portion in the flow direction of the main flow. However, in the present embodiment, as shown in FIG. In the central portion, the height e of the projection 34e is changed so as to be minimum.
[0053]
Also in the present embodiment, if the height e of the protrusion 34e is made different between the adjacent protrusions 34e, the vortex can be effectively sheared or eliminated.
[0054]
(Sixth embodiment)
In the present embodiment, at least two of the protrusions 34e according to the first to fifth embodiments are combined, and the height e of the protrusion 34e is made different between the adjacent protrusions 34e.
[0055]
(Other embodiments)
In the above embodiment, the present invention is applied to the face door 34, but the present invention is not limited to this, and can be applied to other doors.
[0056]
Further, in the above-described embodiment, the present invention is applied to the air-lastomer door in which the door body portion 34a and the lip seal portion 34b are integrally formed. However, the present invention is not limited to this. Can also be applied.
[0057]
Further, in the above-described embodiment, the projection 34e is provided on the face door 34 side. However, the present invention is not limited to this, and the projection 34e may be provided on the air conditioning casing 20 side.
[0058]
Further, in the above-described embodiment, the protrusions 34e are arranged in a C shape, but the present invention is not limited to this, and the protrusions 34e may be arranged in a zigzag, for example.
[0059]
Further, in the above-described embodiment, the projections 34e are arranged in one row, but the present invention is not limited to this, and a plurality of rows of C-shaped projections 34e may be combined.
[0060]
When the projections 34e are arranged in a plurality of rows, at least two of the projections 34e according to the first to fifth embodiments may be combined.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a vehicle air conditioner according to an embodiment of the present invention.
FIG. 2 is an enlarged view around a face door according to the first embodiment of the present invention.
FIG. 3 is a perspective view of the face door alone according to the first embodiment of the present invention.
FIG. 4 is an explanatory diagram of a protrusion according to the first embodiment of the present invention.
FIG. 5 is an explanatory diagram illustrating an air flow around a protrusion according to the first embodiment of the present invention.
FIG. 6 is an explanatory diagram showing an air flow around a protrusion described in Patent Document 1.
FIG. 7 is an explanatory diagram of a protrusion according to a second embodiment of the present invention.
FIG. 8 is an explanatory diagram of a protrusion according to a third embodiment of the present invention.
FIG. 9 is an explanatory diagram of a protrusion according to a fourth embodiment of the present invention.
FIG. 10 is an explanatory diagram of a protrusion according to a fifth embodiment of the present invention.
FIG. 11 is a diagram showing a cause of occurrence of abnormal noise.
FIG. 12 is a diagram showing features of the invention described in Patent Document 1.
[Explanation of symbols]
34: face door, 34a: door body,
34b: Lip seal portion, 34c: Shaft, 34e: Projection portion.

Claims (4)

A casing (20) having an opening (20a) through which air flows and forming an air passage;
A plate-shaped opening / closing door (34) for adjusting an opening area of the opening (20a);
A projection (34e) forming a wall surface (34d) inclined with respect to the main flow direction of the air flow flowing through the gap between the outer edge (20b) of the opening (20a) and the opening / closing door (34); An air passage opening and closing device. A plurality of the wall surfaces (34d) are provided in a plane substantially parallel to the plate surface (34f) of the opening / closing door (34) in a direction substantially orthogonal to the main flow direction,
The air passage opening / closing device according to claim 1, wherein the adjacent wall surfaces (34d) are arranged in a C shape so as to be substantially symmetric with respect to the main flow direction. A plurality of the wall surfaces (34d) are provided on a plane substantially parallel to the plate surface (34f) of the opening / closing door (34) in a direction substantially orthogonal to the main flow direction, and the adjacent wall surfaces (34d) are provided. The air passage opening / closing device according to claim 1, wherein the inclination directions of 34d) are alternately reversed. The air passage opening / closing device according to any one of claims 1 to 3, wherein the projection (34e) is provided on the opening / closing door (34).

Images