JP4539434B2 - Inside / outside air switching device and manufacturing method thereof - Google Patents

Description

  The present invention relates to an inside / outside air switching device using a rotary type inside / outside air switching door and a method of manufacturing the same, and is particularly suitable for an inside / outside air switching device of a vehicle air conditioner.

Conventional inside / outside air switching devices of a vehicle air conditioner include a resin case that allows communication between an inside air inlet and an air outlet and between an outside air inlet and an air outlet by an air passage, and a rotary that is rotatably disposed in the case. An internal / external air switching door, and the rotary internal / external air switching door is rotationally displaced to switch between an internal air mode for introducing internal air and an external air mode for introducing external air (for example, Patent Documents). 1).
JP 2004-217166 A

  By the way, since the inside / outside air switching device of this vehicle air conditioner is mounted inside the vehicle instrument panel in front of the passenger seat, there is a possibility that foreign matter may be mixed into the inside / outside air switching device from inside the glove box, for example. And there exists a possibility that the air blower installed in the air flow downstream rather than the inside / outside air switching device may cause malfunction due to the foreign matter. Therefore, a fence-like or net-like collecting member for preventing foreign matter from being mixed is assembled to the case so as to cover the inside air inlet.

  However, this collecting member is assembled separately from the case and then assembled into the case. Therefore, the manufacturing cost which manufactures a collection member, and the assembly cost which assembles a collection member to a case generate | occur | produced, and these became the cause of the cost increase of an inside / outside air switching device.

  In view of the above points, an object of the present invention is to obtain an inside / outside air switching device having a foreign matter mixing prevention function at low cost.

In order to achieve the above object, according to the first aspect of the present invention, between the inside air inlet (11) in the most upstream part of the air flow and the air outlet (13) in the most downstream part of the air flow and in the most upstream part of the air flow. A resin case (1) for communicating between the outside air inlet (12) and the air outlet (13) by an air passage; an inside / outside air switching door (2) rotatably disposed in the case (1); The inside / outside air switching door (2) includes an outer peripheral wall surface (22), a rotation shaft (21) serving as a rotation center of the outer peripheral wall surface (22), both axial sides of the outer peripheral wall surface (22) and a rotation shaft. (21) is constituted by a rotary door having a side plate (23) connecting between the outer peripheral wall surface (22) and a peripheral member of the side plate (23), and a case (1 ) downstream air side of the outside air switching door on the inner circumferential surface of (2) The seal surface (16a) between which the sealing material (24, 25) contacts and separates between the inside air inlet (11) and the air outlet (13) and between the outside air inlet (12) and the air outlet (13). 16b) and the inside / outside air switching door (2) is rotationally displaced about the rotating shaft (21), thereby allowing the inside air inlet (11) and the air outlet (13) to communicate with each other. An inside air mode that shuts off between the outside air inlet (12) and the air outlet (13), and a passage between the inside air inlet (11) and the air outlet (13) and an outside air inlet (12) and the air outlet. In the inside / outside air switching device for switching between the outside air mode for communicating with (13), a rib (17) arranged so as to block the air passage at the inner peripheral side opening of the seal surface (16a, 16b). The rib (17) is integrated with the case (1) Characterized in that it is shaped.

  According to this, foreign matter mixed into the case from the inside air intake port or the outside air intake port is captured by the rib, so that it is possible to prevent malfunction of the blower installed downstream of the inside / outside air switching device. it can.

  Further, when the rib is disposed in the inner peripheral side opening of the seal surface, the rib can be integrally formed in the case as in the invention described in claim 4, for example. And by integrally forming the rib in the case, the manufacturing cost is lower than in the case where the collecting member is manufactured independently as in the prior art. Conventionally, the work of assembling the collecting member to the case has been necessary, but the work of assembling the rib to the case becomes unnecessary by integrally forming the rib to the case. Therefore, an inside / outside air switching device having a foreign matter mixing prevention function can be obtained at low cost.

  According to a second aspect of the present invention, in the inside / outside air switching device according to the first aspect, the sealing surface (16a, 16b) has a polygonal frame shape, and the rib (17) has the sealing surface (16a, 16b). The two sides are connected to each other.

  According to this, since the rigidity of the case can be increased by the rib, and particularly the rigidity in the vicinity of the seal surface can be increased, the seal surface can be prevented from being deformed and the sealing performance can be improved.

  According to a third aspect of the present invention, in the inside / outside air switching device according to the first or second aspect, the ribs (17) are arranged in a lattice pattern. According to this, the foreign matter capturing function and the case rigidity increasing effect can be obtained easily and reliably.

  According to a fourth aspect of the present invention, there is provided a method for manufacturing the inside / outside air switching device according to any one of the first to third aspects, wherein a plurality of molds for molding the case (1) are prepared, and the case Of the inner peripheral surface of (1), the part from the seal surfaces (16a, 16b) to the air outlet (13) is molded by the first mold (31), and the seal is sealed among the inner peripheral surfaces of the case (1). A portion from the surface (16a) to the inside air suction port (11) is formed by the second mold (32), and, of the inner peripheral surface of the case (1), the seal surface (16b) to the outside air suction port (12). The part to reach is molded by the third mold (33), and further, between the mating surfaces of the first mold (31) and the second mold (32), and the first mold (31) and the third mold A rib (17) is formed between the mating surfaces with (33).

  By the way, when trying to integrally mold the rib to the part of the inside air inlet, the part inside the case is undercut rather than the inside air inlet, so the part from the inside air inlet to the sealing surface, the sealing surface, etc. cannot be molded. turn into.

  On the other hand, as in the invention described in claim 4, by forming ribs between the mating surfaces of the molding die, a portion extending from the inside air inlet to the seal surface, a seal surface, and the like can be molded. The inside / outside air switching device according to 1 to 3 can be easily manufactured. Therefore, an inside / outside air switching device having a foreign matter mixing prevention function can be obtained at low cost.

  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.

  An embodiment of the present invention will be described. 1 is a cross-sectional view showing an inside air mode state of an inside / outside air switching device according to an embodiment of the present invention, FIG. 2 is a perspective view of the inside / outside air switching door of FIG. 1, and FIG. 3 is a perspective view of a case alone of FIG. 4 is a cross-sectional view showing an outside air mode state of the inside / outside air switching device of FIG. 1, and FIG. 5 is a schematic view for explaining a method of manufacturing the case of FIG.

  As shown in FIGS. 1 to 4, the inside / outside air switching device has a resin case 1, and an air flow inlet port 11 for sucking inside air (vehicle interior air) is provided at the most upstream part of the air flow of the case 1. An outside air inlet 12 for sucking outside air (air outside the passenger compartment) is formed, and an air outlet 13 communicating with an inlet of a blower (not shown) is formed at the most downstream part of the air flow of the case 1. The inside air inlet 11 and the air outlet 13 and the outside air inlet 12 and the air outlet 13 are connected by an air passage formed in the case 1. As a material of the case 1, it is desirable to use polypropylene (PP) mixed with talc in order to improve molding accuracy.

  Inside the case 1 is housed a resin inside / outside air switching door 2 that opens and closes both suction ports 11, 12, and this inside / outside air switching door 2 can rotate with respect to the case 1 about a rotating shaft 21. It is a rotary door.

  The inside / outside air switching door 2 has an outer peripheral wall surface 22 extending in the door rotation direction, and has a shape in which both side ends in the axial direction of the outer peripheral wall surface 22 and the rotary shaft 21 are respectively connected by fan-shaped side plates 23. The rotating shaft 21 protrudes axially outward from the rotation center position of the side plate 23, and is rotatably inserted into and supported by a bearing hole (not shown) on the wall surface of the case 1.

  Lip-like (thin plate-like) sealing materials 24 and 25 are fixed to the peripheral edge portions of the outer peripheral wall surface 22 and the side plate 23. The first sealing material 24 is located on one end side in the door rotation direction of the inside / outside air switching door 2, and the second sealing material 25 is located on the other end side in the door rotation direction of the inside / outside air switching door 2.

  On the other hand, a first partition wall 14 that protrudes from the inner wall surface of the case 1 to the air passage side is formed on the air flow downstream side of the inside / outside air switching door 2 inside the case 1 so as to surround the air passage. Yes. In addition, a second partition wall 15 that protrudes from the inner wall surface of the case 1 toward the air passage is formed at an intermediate portion between the inside air inlet 11 and the outside air inlet 12 inside the case 1.

  The surface on the upstream side of the air flow in the first partition wall 14 and the surfaces on both sides of the second partition wall 15 become seal surfaces 16a to 16d with which the sealing materials 24 and 25 of the inside / outside air switching door 2 can come into contact. ing.

  More specifically, a portion of the first partition wall 14 that is located closer to the inside air inlet 11 than the rotary shaft 21 is the first seal surface 16a, and the first seal material 24 is in contact with the first seal surface 16a. Is possible. A portion of the first partition wall 14 located closer to the outside air inlet 12 than the rotary shaft 21 is the second seal surface 16b, and the second seal material 25 can contact the second seal surface 16b.

  The surface of the second partition wall 15 on the side of the inside air inlet 11 is the third seal surface 16c, and the first seal material 24 can come into contact with the third seal surface 16c. The surface on the outside air inlet 12 side of the second partition wall 15 is the fourth seal surface 16d, and the second seal material 25 can come into contact with the fourth seal surface 16d.

  Incidentally, FIG. 1 shows an inside air mode state. Specifically, when the first sealing material 24 abuts on the third sealing surface 16c and the second sealing material 25 abuts on the second sealing surface 16b. The outside air inlet 12 is fully closed and the inside air inlet 11 is fully open. On the other hand, FIG. 4 shows an outside air mode state. Specifically, the first sealing material 24 contacts the first sealing surface 16a, and the second sealing material 25 contacts the fourth sealing surface 16d. The inside air inlet 11 is fully closed and the outside air inlet 12 is fully open.

  The first seal surface 16a and the second seal surface 16b have a substantially quadrangular frame shape having an opening on the inner peripheral side, and are formed on the inner peripheral side openings of the first seal surface 16a and the second seal surface 16b. A plurality of ribs 17 are integrally formed so as to block the air passage. The ribs 17 connect two opposing sides of the first seal surface 16a and the second seal surface 16b, and are arranged in a lattice shape as a whole.

  According to this, since the foreign matter mixed into the case 1 from the inside air inlet 11 or the outside air inlet 12 is captured by the rib 17, malfunction of the blower installed on the downstream side of the air flow from the inside / outside air switching device is prevented. Can be prevented.

  Further, the rib 17 can increase the rigidity of the case 1, and in particular, can increase the rigidity in the vicinity of the seal surfaces 16a to 16d, thereby preventing the deformation of the seal surfaces 16a to 16d and improving the sealing performance. it can.

  Incidentally, the shape of each opening of the lattice formed by the ribs 17 is a substantially quadrangular shape in the present embodiment. The size of each opening of the lattice is desirably 10 mm × 10 mm or more, and is most desirably about 30 mm × 30 mm in view of the balance between the pressure loss and the foreign matter capturing function.

  Next, the manufacturing method of case 1 is demonstrated based on FIG. In FIG. 5, the case 1 is indicated by a solid line, and the molding die is indicated by a one-dot chain line. Further, the case 1 is formed by a large number of molding dies, but only the first to third molding dies 31 to 33 involved in the molding of the rib 17 are illustrated in FIG.

  First, the 1st shaping | molding die 31 shape | molds the part from the 1st sealing surface 16a and the 2nd sealing surface 16b to the air outlet 13 among the internal peripheral surfaces of the case 1, and moves to a paper surface up-down direction.

  The second molding die 32 molds the portion of the inner peripheral surface of the case 1 that extends from the first seal surface 16a and the third seal surface 16c to the inside air intake port 11, and moves in the left-right direction on the paper surface.

  The 3rd shaping | molding die 33 shape | molds the part from the 2nd seal surface 16b and the 4th seal surface 16d to the external air inlet 12 among the internal peripheral surfaces of case 1, and moves to the paper surface up-down direction.

  The first mold 31 is formed with a lattice-like groove for molding the rib 17 on the surface facing the second mold 32 and the third mold 33.

  And between the mating surfaces of the 1st shaping | molding die 31 and the 2nd shaping | molding die 32, while the site | part of the 1st sealing surface 16a in the 1st partition wall 14 is shape | molded, a part of rib 17 is shape | molded. Further, between the mating surfaces of the first molding die 31 and the third molding die 33, the portion of the second seal surface 16b in the first partition wall 14 is molded, and the remaining portion of the rib 17 is molded. Further, the second partition wall 15 is formed between the mating surfaces of the second mold 32 and the third mold 33.

  By the way, if the rib 17 is formed integrally with the portion of the inside air inlet 11, the portion inside the case 1 is undercut rather than the inside air inlet 11, so that the first seal surface 16 a and the third seal are formed from the inside air inlet 11. The part reaching the surface 16c, the first seal surface 16a, the third seal surface 16c, and the like cannot be molded.

  On the other hand, as in this embodiment, the rib 17 is provided between the mating surfaces of the first molding die 31 and the second molding die 32 and between the mating surfaces of the first molding die 31 and the third molding die 33. By molding the portion from the inside air inlet 11 to the first seal surface 16a and the third seal surface 16c, the first seal surface 16a and the third seal surface 16c, and the like can be formed.

  Thus, by integrally forming the rib 17 in the case 1, the manufacturing cost is lower than in the case where the collecting member is manufactured independently as in the prior art. Conventionally, the work of assembling the collecting member to the case 1 is necessary, but the work of assembling the rib 17 to the case 1 becomes unnecessary by integrally forming the rib 17 to the case 1. Therefore, an inside / outside air switching device having a foreign matter mixing prevention function can be obtained at low cost.

(Other embodiments)
In the above-described embodiment, the shape of each opening of the lattice formed by the ribs 17 is substantially a quadrangle, but may be a polygon other than a quadrangle or a circle. When each opening of the lattice is a polygon, the size of one side is desirably 10 mm or more, and when each opening of the lattice is circular, the size is desirably 10 mm or more.

  Moreover, in the said embodiment, although the rib 17 connected between two opposing sides in the 1st sealing surface 16a and the 2nd sealing surface 16b, the rib 17 may connect between adjacent sides.

It is sectional drawing which shows the inside air mode state of the inside / outside air switching apparatus which concerns on one Embodiment of this invention. FIG. 2 is a perspective view of a single inside / outside air switching door of FIG. 1. It is a perspective view of the case single-piece | unit of FIG. It is sectional drawing which shows the external air mode state of the internal / external air switching device of FIG. It is a schematic diagram with which it uses for description of the manufacturing method of the case of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Case, 2 ... Inside / outside air switching door, 11 ... Inside air inlet, 12 ... Outside air inlet, 13 ... Air outlet, 16a, 16b ... Seal surface, 17 ... Rib, 21 ... Rotating shaft, 22 ... Outer wall surface, 23 ... Side plate, 24, 25 ... Sealing material.

Claims (4)

Between the inside air inlet (11) at the most upstream part of the air flow and the air outlet (13) at the most downstream part of the air flow and between the outside air inlet (12) at the most upstream part of the air flow and the air outlet (13). A resin case (1) that communicates with the air passage, and an inside / outside air switching door (2) that is rotatably arranged in the case (1),
The inside / outside air switching door (2) includes an outer peripheral wall surface (22), a rotation shaft (21) serving as a rotation center of the outer peripheral wall surface (22), both axial sides of the outer peripheral wall surface (22), and the rotation. A rotary door having a side plate (23) connecting between the shafts (21), and a sealing material (24, 25) fixed to a peripheral portion of the outer peripheral wall surface (22) and the side plate (23);
On the inner peripheral surface of the case (1), on the downstream side of the air flow from the inside / outside air switching door (2) , between the inside air inlet (11) and the air outlet (13) and the outside air inlet ( 12) and the air outlet (13) are formed with sealing surfaces (16a, 16b) on which the sealing materials (24, 25) come in contact with and away from,
The inside / outside air switching door (2) is rotationally displaced about the rotating shaft (21), thereby communicating between the inside air inlet (11) and the air outlet (13) and the outside air inlet ( 12) and the air outlet (13) are shut off between the inside air mode, the inside air inlet (11) and the air outlet (13) are shut off, and the outside air inlet (12) and the air are shut off. In the inside / outside air switching device that switches and sets the outside air mode for communicating with the outlet (13),
A rib (17) disposed so as to block the air passage is provided at an inner peripheral side opening of the seal surface (16a, 16b), and the rib (17) is integrally formed with the case (1). An inside / outside air switching device characterized by that. The said sealing surface (16a, 16b) is a polygonal frame shape, The said rib (17) has connected between two sides in the said sealing surface (16a, 16b). The inside / outside air switching device according to 1. The inside / outside air switching device according to claim 1 or 2, wherein the ribs (17) are arranged in a lattice pattern. A method for manufacturing the inside / outside air switching device according to any one of claims 1 to 3,
Preparing a plurality of molds for molding the case (1);
Of the inner peripheral surface of the case (1), a portion from the sealing surface (16a, 16b) to the air outlet (13) is molded by the first molding die (31),
Of the inner peripheral surface of the case (1), a portion from the seal surface (16a) to the inside air inlet (11) is molded by the second molding die (32),
Of the inner peripheral surface of the case (1), a portion from the seal surface (16b) to the outside air inlet (12) is molded by a third mold (33),
Furthermore, between the mating surfaces of the first mold (31) and the second mold (32) and between the mating surfaces of the first mold (31) and the third mold (33), A method for manufacturing an inside / outside air switching device, wherein the rib (17) is formed.

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