JP4600143B2 - Air passage opening and closing device - Google Patents

Description

  The present invention relates to an apparatus for opening and closing an air passage by a rotatable flat door, and is suitable for use in a vehicle air conditioner.

  Conventionally, in an air conditioner for a vehicle, an air passage opening / closing device using a rotatable flat door is employed. For example, a blow mode door that opens and closes an air outlet for air blown into the vehicle interior and an air mix door that adjusts the temperature of air blown into the vehicle interior are typical examples of this type of air passage opening and closing device.

  Among the blowout mode doors, the defroster door is operated to a minute opening position that opens the defroster outlet by a minute opening degree in the foot mode. In the air mix door, when the cold air passage is shifted from the fully closed state (maximum heating state) to the temperature control region, the air mix door is operated to a minute opening position that opens the cold air passage by a minute opening. Similarly, the air mix door is operated to a minute opening position that opens the warm air passage by a minute opening degree when the warm air passage is shifted from the fully closed state (maximum cooling state) to the temperature control region.

  As described above, when the rotary flat plate door constituting the defroster door or the air mix door is operated to the minute opening position, the air flows through the minute gap at the door front end, and the minute gap causes the air to flow. The flow is rapidly squeezed, and the air is ejected through the minute gap at a high speed and flows into the expansion space on the downstream side of the flat door end.

  Here, when air passes through the minute gap at the door tip, the pressure energy of the air flow is converted into velocity energy, and the pressure in the downstream space on the door tip is transferred to the upstream space on the door tip. Compared to a sudden drop.

  Due to the sudden drop in the pressure in the downstream space on the front end of the door (details will be described later), self-excited vibration of the rotary flat plate door occurs and abnormal noise occurs.

  Therefore, Patent Document 1 describes providing a self-excited vibration preventing means for making the air flow passing through the minute gap at the front end of the door at the minute opening degree of the door uneven in the door axial direction.

  Specifically, the self-excited vibration preventing means is constituted by a protruding wall portion provided on the case wall surface facing the front end portion of the door. The protruding wall portion has a shape that changes its height in a straight line, curved line, unevenness, or stepped shape in the door axial direction.

Moreover, in patent document 2, the uneven | corrugated notch shape part is provided in the sealing material provided in a door front-end | tip part, the generation | occurrence | production of a two-dimensional vortex at the time of a door small opening degree is suppressed, and generation | occurrence | production of abnormal noise is suppressed. It is described.
JP-A-11-291741 Utility Model Registration No. 2570855

  Since it is the structure which changes the height of a protrusion wall part complicatedly in the door axial direction as it is the said patent document 1, it is complicated to obtain | require the optimal shape for self-excited vibration, and the protrusion wall part Formation is also troublesome and causes cost increase. Moreover, in patent document 2, since an uneven | corrugated notch shape part is provided in a sealing material, it becomes difficult to ensure sealing performance.

  In view of the above points, an object of the present invention is to suppress a self-excited vibration of a door at a small opening degree of the door with a simple configuration and to ensure a sealing property with certainty.

In order to achieve the above object, the invention according to claim 1 is an air passage opening and closing device for opening and closing the air passage (12) by a rotatable flat door (13),
The flat door (13) includes a door substrate portion (13a) and a sealing material (13d) fixed to an outer peripheral edge portion of the door substrate portion (13a).
When the air passage (12) is fully closed by the flat door (13), the sealing material (13d) comes into pressure contact with the wall surface (11a) of the air passage (12),
On the other hand, the flat door (13) is operated to a minute opening position, and the sealing material (13d) that forms the tip of the flat door (13 ) and the wall surface (11a) of the air passage (12). When the minute gap (16) is formed between them, the enlargement that enlarges the minute gap (16) between the downstream surface of the sealing material (13d) and the wall surface (11a) of the flat door (13). A space (14) is formed,
When the position where the sealing material (13d) is pressed against the wall surface (11a) when the air passage (12) is fully closed is the contact position (C), the contact position (C) of the wall surface (11a ). A protrusion (15) projecting into the expansion space (14) at a position downstream of the air flow by a predetermined distance than
An angle formed between a line connecting the contact position (C) on the wall surface (11a) and the top of the protrusion (15) and a downstream side surface of the sealing material (13d) of the flat door (13) is θ2. The height (h) of the protrusion (15) is set so that the angle (θ2) is less than 15 °,
The projection (15) inhibits the air flow that flows into the expansion space (14) from the minute gap (16) when the flat door (13) has a minute opening.

According to this, at the time of the minute opening degree of the flat door (13), it is possible to suppress the increase in the air flow speed due to the narrowing action of the minute gap (16) by the protrusion (15). As a result, since the pressure drop in the expansion space (14) can be suppressed, the self-excited vibration of the door can be suppressed well. Thus, the protrusion (15) protrudes into the expansion space (14) downstream of the minute gap (16). It functions to suppress an increase in the speed of air flow (a pressure drop in the expansion space (14)), and may be a simple protrusion (rib) shape.

  For this reason, it is not necessary to change the shape of the protruding wall portion of the case wall surface in a complicated manner in the door axis direction as in Patent Document 1, and it can be implemented with a simple configuration at low cost.

  Further, unlike Patent Document 2, it is not necessary to provide a concave-convex notched portion in the seal material at the door front end portion, and it is easy to ensure the sealing performance when the air passage is fully closed.

In invention of Claim 1, the line which connects the said contact position (C) in the said wall surface (11a) and the top part of the said protrusion (15), and the said sealing material (13d) of the said flat door (13) The height (h) of the protrusion (15) is set so that the angle (θ2) is less than 15 ° when the angle formed with the downstream side surface is θ2.
According to the study by the present inventor, the required height of the protrusion (15) can be appropriately secured by setting the protrusion height (h) so that the angle (θ2) is less than 15 ° as described above. In addition, the self-excited vibration suppressing action of the door can be exhibited more effectively .

As in the embodiment described in 請 Motomeko 2, the air passage switching device according to claim 1 wherein said protrusion (15), specifically, elongated over the entire axial direction of the flat door (13) What is necessary is just to form as an extended protrusion shape.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
1 to 3 show a first embodiment, and show an example in which the present invention is applied to an opening / closing device for a defroster outlet of a vehicle air conditioner. 1 is a cross-sectional view of a portion A in FIG. The air conditioning unit case 10 is a resin member as is well known, and is mounted in the inner space of the instrument panel at the foremost part of the passenger compartment.

  The internal space of the air conditioning unit case 10 constitutes an air passage through which air blown toward the passenger compartment flows, and in this internal space, a cooling heat exchanger, a heating heat exchanger, an air passage opening / closing door, etc. Equipment is stored.

  A box-shaped wall 11 is integrally formed on the upper surface of the air-conditioning unit case 10 so as to protrude upward, and a defroster outlet 12 communicating with the internal space of the air-conditioning unit case 10 is formed inside the box-shaped wall 11. Is done.

  The defroster outlet 12 is supplied with conditioned air whose temperature has been adjusted after passing through the cooling heat exchanger and the heating heat exchanger as indicated by an arrow a. A face air outlet and a foot air outlet (not shown) are arranged in the vicinity of the upper surface of the air conditioning unit case 10, and the conditioned air whose temperature is adjusted flows into the face air outlet and the foot air outlet. .

  The shape of the box-shaped wall 11, that is, the opening shape of the defroster outlet 12 is a rectangular shape that extends in the vehicle left-right (width) direction as shown in FIG. 2. An inlet portion of a defroster duct (not shown) is connected to an upper end portion of the box-shaped wall portion 11 (defroster outlet 12), and a defroster nozzle portion that blows air toward the inner surface of the vehicle window glass at the outlet portion of the defroster duct. Is provided.

  A defroster door 13 composed of a rotary flat plate door is disposed in the box-shaped wall portion 11 so as to open and close the defroster outlet 12. Accordingly, the defroster outlet 12 constitutes an air passage for opening and closing the door.

  In the present embodiment, a butterfly door in which a rotation shaft 13b is arranged at the center of the door substrate portion 13a is used as the defroster door 13. The defroster door 13 made of this butterfly door has a horizontally long rectangle corresponding to the rectangular opening of the defroster outlet 12 as shown in FIG.

  For this reason, the door substrate portion 13a is also a horizontally long rectangle, and the rotation shaft 13b is disposed so that the central portion of the rectangle extends in parallel to the door longitudinal direction (door long side direction), and both end portions of the rotation shaft 13b. Is rotatably supported by a bearing hole provided in the box-shaped wall portion 11. One end 13c of the rotating shaft 13b protrudes outside the box-shaped wall 11 and is connected to a door drive mechanism (not shown).

  The door substrate portion 13a and the rotating shaft 13b are integrally formed of a resin material, and constitute a highly rigid portion (rigid body portion) of the door 13. On the other hand, a sealing material 13d is integrally fixed to the outer peripheral edge of the door main body 13a. As shown in FIG. 2, the sealing material 13d is formed in a frame shape along the entire circumference of the outer peripheral edge of the door body 13a.

  This frame-shaped sealing material 13d constitutes a lip-shaped sealing member that is easily elastically deformed. Here, specifically, a thermoplastic elastomer is suitable as the elastic material constituting the sealing material 13d. This thermoplastic elastomer exhibits rubber elasticity at room temperature, while it melts and exhibits fluidity when heated at high temperatures, and can be injection-molded in the same manner as a thermoplastic resin. Therefore, the door substrate portion 13a and the rotating shaft 13b that form the rigid body portion and the sealing material 13d can be integrally formed.

  Sealing wall surfaces 11a and 11b facing the sealing material 13d of the defroster door 13 are integrally formed on the inner surface of the box-shaped wall portion 11, and when the defroster outlet 12 is fully closed, the tip of the sealing material 13d is the sealing wall surface. 11a and 11b are press-contacted. When the defroster outlet 12 is fully opened (in the defroster mode), the defroster door 13 is operated to a position rotated approximately 90 ° clockwise from the position of FIG.

  3 (a) and 3 (b) show a state where the defroster door 13 is operated to a minute opening position. FIG. 3 (a) is an enlarged view of a portion B in FIG. 1, and FIG. It is a perspective view of 3 (a). When the defroster door 13 rotates counterclockwise and is operated in a direction to close the defroster outlet 12, the air flow downstream of the tip of the defroster door 13 (the tip of the door substrate portion 13 a and the sealing material 13 d). A tapered enlarged space 14 is formed between this surface and one seal wall surface 11 a of the box-shaped wall portion 11. The expansion space 14 gradually expands the space cross-sectional area in a tapered shape (triangular cross section) along the air flow direction.

  Incidentally, the surface on the downstream side of the air flow at the tip of the defroster door 13 facing the other seal wall surface 11b of the box-shaped wall 11 directly faces the enlarged space inside the box-shaped wall 11 as shown in FIG. Therefore, the tapered enlarged space 14 as described above is not formed.

Then, in one of the sealing wall 11 a box-shaped wall portion 11, the air flow downstream portion of the distal end portion of the defroster door 13, a door tip (sealing member 13d part) to the headed protruding projection 15 is box-shaped wall portion 11 is integrally formed.

  In the present embodiment, the protrusion 15 has a triangular cross section. The formation position of the protrusion 15 is set within the range of the tapered enlarged space 14 formed by the surface on the downstream side of the door tip and the seal wall surface 11a.

  As shown in FIG. 3B, the protrusion 15 has a shape extending elongated in parallel with the door longitudinal direction (door axial direction). More specifically, the protrusion 15 is formed over the entire range of the sealing material 13d in the longitudinal direction, and is opposed to the door tip (sealing material 13d portion) when the door 13 is slightly opened.

  Next, the operation of this embodiment in the above configuration will be described. When a blower (not shown) of the vehicle air conditioner is operated, the blown air of the blower flows through the internal space of the air conditioning unit case 10 toward the vehicle interior. When the defroster mode is set as the blowing mode of the vehicle air conditioner, the defroster door 13 is operated to a position rotated approximately 90 ° clockwise from the position of FIG. 1 to fully open the defroster outlet 12.

  On the other hand, when the foot mode is set as the blowing mode, the defroster door 13 is operated to the minute opening position shown in FIGS. 3A and 3B and opens the defroster outlet 12 by the minute opening.

  Thus, when the defroster door 13 is operated to the minute opening position, the self-excited vibration of the defroster door 13 is generated by the following mechanism. FIG. 4 is an explanatory diagram of the mechanism for generating this self-excited vibration. When the defroster door 13 is operated to a minute opening position, a minute gap 16 is formed between the tip of the sealing material 13d and the seal wall surface 11a. Then, air passes through the minute gap 16 and flows into the tapered enlarged space 14 (see arrow a).

  At this time, since the air flow is rapidly narrowed by the minute gap 16, the air flows into the tapered expansion space 14 at a high speed. Here, when air passes through the minute gap 16 at the front end of the door, the pressure energy of the air flow is converted into velocity energy, and accordingly, the pressure in the tapered enlarged space 14 on the downstream side of the front end of the door is changed to the door. Compared to the space upstream of the tip, it rapidly decreases.

  As described above, when the pressure in the tapered enlarged space 14 on the downstream side of the door front end decreases rapidly, the sealing material 13d is sucked toward the seal wall surface 11a as indicated by the arrow b due to the pressure difference between the front and rear ends of the door. When the size of the minute gap 16 is reduced due to the displacement of the sealing material 13d, the amount of air passing through the minute gap 16 and the passing air speed are also reduced, so that the pressure in the tapered enlarged space 14 is increased.

  As a result, the pressure difference between the front and rear ends of the door decreases, so that the sealing material 13d is displaced in the direction of arrow c by its own elastic restoring force, and the minute gap 16 returns to its original size. Then, the pressure difference between the front and rear ends of the door increases again, and the sealing material 13d is again sucked into the enlarged space 14 as indicated by the arrow b. Hereinafter, such an operation is repeated at a minute time interval, and the self-excited vibration of the defroster door 13 is generated.

  By the way, the inclination angle θ1 of the tapered expansion space 14 shown in FIG. 4, that is, the inclination angle θ1 formed by the seal wall surface 11a and the downstream side surface of the door front end portion, the door self-excited vibration is in the range of θ1 = 10 to 30 °. It was found that it was particularly likely to occur. That is, when the inclination angle θ1> 30 °, the downstream expansion space 14 rapidly expands with respect to the minute gap 16, so that the air velocity after passing through the minute gap 16 rapidly decreases in the space 14.

  This means that in the enlarged space 14, the pressure drop portion is only in a very small range immediately after passing through the minute gap 16, and the door self-excited vibration is less likely to occur.

  Further, when the inclination angle θ1 <10 °, the downstream side surface of the door front end portion approaches substantially parallel to the seal wall surface 11a, so that the entire area of the downstream side surface of the door front end portion extends thinly and long between the seal wall surface 11a. A gap 16 is formed.

  With such a thin and long minute gap 16, the air flow is gradually throttled in the long flow path of the minute gap 16, so that there is no sudden drop in the pressure of the air flow. Less likely to occur.

As shown in FIG. 1, the surface on the downstream side of the air flow at the front end of the door facing the other seal wall surface 11b of the box-shaped wall 11 directly faces the enlarged space inside the box-shaped wall 11, so The tapered enlarged space 14 like the one seal wall surface 11a is not formed. Therefore, in the sealing wall 11 b side, high-speed phenomenon of air by the small gap of the door tip, since only occur in a small portion of the range immediately after the small gap, the self-excited vibration does not occur.

  The inventor experimentally examined the relationship between the pressure difference before and after the door front end and the minute gap 16 at the door front end, and obtained the results shown in FIG. The horizontal axis in FIG. 5 is the dimension of the minute gap 16, and the vertical axis is the pressure difference before and after the door tip. The left end portion of the horizontal axis in FIG. 5 shows a state in which the tip of the sealing material 13d comes into contact with the seal wall surface 11a and the gap dimension = 0, and the pressure difference (pressure in the space 14 increases as the gap dimension increases. The degree of decrease) increases, and the pressure difference peaks when the gap dimension is a predetermined value.

  The gap size at which this pressure difference peaks varies depending on the configuration of the indoor air conditioning unit of the vehicle air conditioner. However, if the unit configuration is a normal unit, the pressure difference is in the range of gap size = 0.5 to 1.0 mm. It turned out to be a peak.

  Therefore, in the present embodiment, the door front end (seal) is within the range of the tapered enlarged space 14 formed by the surface on the downstream side of the door front end and the one seal wall surface 11a when the minute opening position of the defroster door 13 is operated. A protrusion 15 protruding toward the material 13d portion) is arranged. According to this, the projection 15 exerts an effect of inhibiting the air flow that passes through the minute gap 16 at the front end of the door and enters the tapered enlarged space 14.

  As a result, an increase in the speed of the air flow entering the expansion space 14 is suppressed, and therefore, the degree of pressure decrease in the tapered expansion space 14 is reduced by an amount corresponding to the suppression of the increase in speed, that is, the decrease in speed. Thereby, the pressure difference before and behind the front end of the door is reduced, and the self-excited vibration of the door 13 can be suppressed well.

  The protrusion height h of the protrusion 15 from the seal wall surface 11a is preferably set so that the angle θ2 shown in FIG. 6 is less than 15 ° (θ2 <15 °). By setting the protrusion height h in this way, the protrusion ratio of the protrusion 15 with respect to the flow path cross-sectional direction in the tapered enlarged space 14 can be set to a predetermined value or more, and the effect of reducing the pressure difference can be effectively exhibited. Here, the angle θ2 is an angle formed by a line connecting the contact position C of the door tip on the seal wall surface 11a and the top of the protrusion 15 and the downstream side surface of the door tip.

  FIG. 7 is an explanatory view showing the effects of the present embodiment, and is a view corresponding to FIG. 5. In FIG. The relationship between the pressure difference and the gap dimension is shown. On the other hand, the broken line (2) shows the relationship between the pressure difference before and after the front end of the door according to the present embodiment provided with the protrusion 15 and the gap dimension.

  In addition, the protrusion 15 in (2) is provided in the position shown in FIG. 3 in the same cross-sectional shape as in FIG. The protrusion height of the protrusion 15 from the seal wall surface 11a is 0.8 mm, and when the minute gap 16 = 0.4 mm, the angle θ2 in FIG. 6 is 13 °.

  According to the present embodiment, the pressure difference between the front and rear ends of the door can be reduced to a sufficiently small value less than 1/2 of the solid line (1) of the prior art as shown by the broken line (2). It was confirmed that the vibration can be satisfactorily suppressed.

(Second Embodiment)
In the first embodiment, the protrusion 15 is formed on the seal wall surface 11a on the box-shaped wall 11 side (case 10 side). However, in the second embodiment, as shown in FIG. The projection 15 is integrally formed on the door substrate portion 13a.

  Also in the second embodiment, the air flow entering the tapered enlarged space 14 from the minute gap 16 at the front end of the door is inhibited by the protrusion 15, thereby suppressing the increase in the speed of the air flowing out from the minute gap 16 and taper. The pressure drop in the enlarged space 14 can be suppressed. Thereby, a door self-excited vibration can be suppressed favorably.

  In addition, it is preferable to set the height h of the protrusion 15 integrally formed with the door substrate portion 13a so as to secure a height at which the angle θ3 is less than 15 ° (θ1 <15 °). Here, the angle θ3 is an angle formed by a line connecting the contact position C of the door tip portion on the seal wall surface 11a and the top of the protrusion 15 and the seal wall surface 11a.

(Other embodiments)
The present invention is not limited to the first and second embodiments described above, and can be variously modified as described below.
(1) In the first and second embodiments, the cross-sectional shape of the protrusion 15 is formed in a triangular cross section, but the cross-sectional shape of the protrusion 15 is not limited to a triangular cross section, but a semicircular cross section, a trapezoidal cross section, etc. Other shapes may be used.
(2) In the first and second embodiments, the present invention is applied to the defroster door. However, as in Patent Document 1 (Japanese Patent Laid-Open No. 11-291174), the vehicle is adjusted by adjusting the air volume ratio of the cool and warm air. You may apply this invention to the air mix door etc. which adjust the blowing air temperature to room | chamber interior.
(3) In the first and second embodiments, as an example of using a butterfly door in which the rotation shaft 13b is disposed at the center of the door base plate portion 13a as the rotary flat plate door, the one end portion of the door base plate portion 13a is described. The present invention is applied to the case where the rotary shaft 13b is disposed on the door and the cantilever door (see the air mix door in Patent Document 1) is configured such that the other end portion of the door base plate portion 13a is the rotation tip side. May be.
(4) In the first and second embodiments, the example (rubber seal type door) in which the sealing material 13d made of a rubber-based elastic material is integrally fixed to the outer edge portion of the door substrate portion 13a has been described. The door structure which abolishes the sealing material 13d which consists of material, affixes the sealing packing material on the front-and-back both surfaces or at least one surface of the door board | substrate part 13a, and obtains the sealing effect at the time of air passage full closure using this sealing packing material The present invention may be applied to a (packing seal type door).

It is principal part sectional drawing which shows 1st Embodiment of this invention, and is A section sectional drawing of FIG. It is a schematic perspective view of the defroster blower outlet part shown in FIG. (A) is the B section expanded sectional view of Drawing 1, and (b) is a perspective view of (a). It is principal part sectional drawing explaining the generation | occurrence | production mechanism of door self-excited vibration. It is a graph which shows the relationship between the pressure difference before and behind a door front-end | tip part, and a clearance dimension. It is explanatory drawing explaining how to determine the height dimension of the case side protrusion. It is a graph which shows the relationship between the pressure difference before and behind a door front-end | tip part, and a clearance dimension, and compares and shows 1st Embodiment and a prior art. It is principal part sectional drawing which shows 2nd Embodiment of this invention.

Explanation of symbols

10 ... Case, 11a ... Seal wall surface, 12 ... Defroster outlet (air passage),
13 ... defroster door (flat door), 14 ... expansion space, 15 ... projection, 16 ... minute gap.

Claims (2)

An air passage opening and closing device for opening and closing an air passage (12) by a rotatable flat door (13),
The flat door (13) includes a door substrate portion (13a) and a sealing material (13d) fixed to an outer peripheral edge portion of the door substrate portion (13a).
When the air passage (12) is fully closed by the flat door (13), the sealing material (13d) comes into pressure contact with the wall surface (11a) of the air passage (12),
On the other hand, the flat door (13) is operated to a minute opening position, and the sealing material (13d) that forms the tip of the flat door (13) and the wall surface (11a) of the air passage (12). When the minute gap (16) is formed between them, the enlargement that enlarges the minute gap (16) between the downstream surface of the sealing material (13d) and the wall surface (11a) of the flat door (13). A space (14) is formed,
When the position where the sealing material (13d) is pressed against the wall surface (11a) when the air passage (12) is fully closed is the contact position (C), the contact position (C) of the wall surface (11a). A protrusion (15) projecting into the expansion space (14) at a position downstream of the air flow by a predetermined distance than
An angle formed between a line connecting the contact position (C) on the wall surface (11a) and the top of the protrusion (15) and a downstream side surface of the sealing material (13d) of the flat door (13) is θ2. The height (h) of the protrusion (15) is set so that the angle (θ2) is less than 15 °,
The air passage opening and closing characterized in that the projection (15) inhibits the air flow that flows into the expansion space (14) from the minute gap (16) when the flat door (13) is slightly opened. apparatus. 2. The air passage opening and closing device according to claim 1 , wherein the protrusion (15) has a protruding shape that is elongated over the entire area in the axial direction of the flat door (13).

Images