JP2016185742A - Vehicle air conditioner filter support structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle air conditioner filter support structure capable of suppressing the increase of blast resistance and the generation of noise as much as possible.SOLUTION: A vehicle air conditioner filter support structure, in which an air blower 21 is disposed in an air introduction passage, a bellmouth 20a is provided on a suction side of the air blower 21, and a filter 12 is disposed upstream, in the air introduction passage, of the bellmouth 20a, thereby supporting the filter 12, comprises: a bottom-surface-peripheral-edge support section 32 that supports a peripheral edge of a bottom surface of the filter 12; and a support beam 33 that is coupled to the bottom-surface-peripheral-edge support section 32 and that supports a central side of the filter 12 with respect to the peripheral edge thereof, the support beam 33 has a central support beam section 33a disposed to be fit with a shape of the bellmouth 20a, and the central support beam section 33a has a shape fit with the shape of the bellmouth 20a at a position closer to the bellmouth 20a than a center of the bellmouth 20a.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a filter support structure of a vehicle air conditioner that supports a filter that removes dust from air sucked by a blower.

  For example, a vehicle air conditioner has a blower in an air conditioning case, and supplies air sucked by the blower into a vehicle compartment as desired conditioned air by an evaporator, a heater core, or the like. In order to supply clean conditioned air into the passenger compartment, a filter is disposed immediately upstream of the blower in the air conditioning case. The filter is supported by the filter support structure to receive the suction force of the blower.

  Patent Document 1 proposes such a filter support structure. As shown in FIG. 7, this filter support structure includes a frame 131 that holds the entire outer edge of the filter 112 and a circular opening (suction port) 134 a, and a bottom surface holding plate that supports the peripheral edge of the lower surface of the filter 112. 134 and a cross-shaped filter support beam 132 which is fixed to the bottom surface holding plate 134 and arranged so as to cross the opening 134a of the bottom surface holding plate 134 when viewed from the upstream side in the air flow direction.

  The air sucked by the blower passes through the filter 112, and the filter 112 captures dust in the air. Although the filter 112 receives the air pressure, it is held by the filter support beam 132, so that the filter 112 is not deformed by the air pressure, and the filter 112 does not fall off the filter support member 130.

Japanese Patent Laid-Open No. 2004-251211

  However, in the conventional filter support structure, since the filter support beam 132 supports the vicinity of the center point of the filter 112 having the largest blowing force that passes through the filter 112, strong air blows against the filter support beam 132. There is a problem that noise is generated, resulting in a large blowing resistance.

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a filter support structure for a vehicle air conditioner that can suppress an increase in blowing resistance and generation of noise as much as possible.

  In the present invention, a blower is disposed in the air introduction passage, a bell mouth is provided on the suction side of the blower, a filter is disposed on the upstream side of the air introduction passage from the bell mouth, and supports the filter. A filter support structure for a vehicle air conditioner, comprising: a bottom support portion that supports the periphery of the bottom surface of the filter; and a support beam that is coupled to the bottom support portion and supports the center side from the periphery of the filter. The beam has a central support beam portion that is arranged following the shape of the bell mouth, the center support beam portion is closer to the bell mouth than the center of the bell mouth, and has a shape that follows the shape of the bell mouth. This is a filter support structure for a vehicle air conditioner.

  According to the present invention, in the vicinity of the center point of the filter having the largest blowing force passing through the filter, it is not supported by the filter support beam, so that strong blowing does not hit the filter support beam, increasing the blowing resistance and generating noise. Can be suppressed as much as possible.

1 is a perspective view of an intake side unit according to an embodiment of the present invention. FIG. 4 is a side view of the intake side unit according to the embodiment of the present invention. FIG. 3 shows an embodiment of the present invention and is a cross-sectional view taken along line AA in FIG. 2. FIG. 4 is a view of a filter support structure (a filter is shown in phantom) and a bell mouth from the upstream side of the air introduction passage according to the embodiment of the present invention. 1A shows an embodiment of the present invention, FIG. 3A is a characteristic diagram showing a relationship between a position in a bell mouth and wind force (suction force), and FIG. 3B is a graph showing 30%, 50%, and 70% of circular support beams. It is a figure which shows each position. It is a characteristic diagram which shows one Embodiment of this invention and shows the magnitude | size of the noise level with respect to each lattice shape and an installation position. It is a top view which shows the filter support structure of a prior art example.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  1 to 6 show an embodiment of the present invention. The vehicle air conditioner includes an air conditioning unit body (not shown) having an evaporator, a heater core, a mix door, and the like, and an intake side unit 1 that sends air to the air conditioning unit body. The intake side unit 1 has an intake side case 2 which is a case.

  The intake side case 2 has an air introduction case portion 3 and a blower case portion 5, and these are assembled. An air introduction passage 6 is formed in the intake case 2. The air introduction case 3 is configured by assembling two divided case bodies 3a and 3b. The air introduction case portion 3 is formed with an inside air introduction port 7 and an outside air introduction port 9 that open to the air introduction passage 6 together.

  In the air introduction case portion 3, a rotary type inside / outside air switching door 11 is attached at a position downstream of the air introduction passage 6 from both the inside air introduction port 7 and the outside air introduction port 9. The inside / outside air switching door 11 varies the ratio of air introduced from the inside air introduction port 7 and the outside air introduction port 9 according to the rotational position. The inside / outside air switching door 11 includes a plate portion 11a, a pair of arm portions 11b provided on both sides of the plate portion 11a, and a rotation support shaft 11c provided on the free end side of the pair of arm portions 11b. The introduction of air is shielded by the plate portion 11a and the pair of arm portions 11b. The rotation support shaft 11 c is inserted into the bearing hole 40 of the air introduction case portion 3. The rotation support shaft (rotation fulcrum) 11 c of the inside / outside air switching door 11 is set at a position on the downstream side of the ventilation with respect to the surface 12 a on the upstream side of the ventilation of the filter 12.

  In the air introduction case portion 3, a filter 12 is disposed at a position downstream of the air introduction passage 6 from both the inside air introduction port 7 and the outside air introduction port 9. That is, all the air introduced from the inside air introduction port 7 and the outside air introduction port 9 passes through the filter 12. The filter 12 captures dust in the air and allows only air to pass through. The filter 12 is disposed so as to shield the air introduction passage 6 by the filter support structure.

  In the filter 12, the filter medium is alternately bent into a bellows shape in a wave shape, and the apexes of each bellows shape are connected and fixed with an adhesive to maintain the shape of the bent portion. The filter support structure will be described in detail below.

  A filter holding lid 13 is detachably provided at the filter insertion port of the air introduction case 3. The filter 12 can be replaced by opening the filter insertion port with the filter holding lid 13, and the filter 12 can be accommodated in the air introduction case 3 by closing the filter insertion port with the filter holding lid 13. To prevent the air introduction case part 3 from falling off.

  The blower case portion 5 is configured by assembling two divided case bodies 5a and 5b. The blower case portion 5 has a blower housing chamber 20 that constitutes a part of the air introduction passage 6. A sirocco blower 21 is arranged in the blower housing chamber 20. That is, the blower 21 is disposed at a downstream position of the air introduction passage 6 from the filter 12.

  A circular bell mouth 20 a is formed at the inlet of the blower housing chamber 20 when viewed from the upstream side of the air introduction passage 6. The internal space of the bell mouth 20a serves as an air inlet to the blower 21. The sirocco blower 21 sucks air efficiently by the bell mouth 20a. The air that has passed through the blower 21 is sent to the air passage of the air conditioning unit main body (not shown) from the air outlet 22.

  Next, the filter support structure will be described. As shown in detail in FIG. 4, the filter support structure uses the inner surface of the air introduction case portion 3 to support the three side surfaces of the filter 12, and the air introduction passage from the inner surface of the air introduction case portion 3. 6, and includes a rectangular frame-shaped bottom surface periphery support portion 32 that supports the entire periphery of the bottom surface of the filter 12, and a support beam 33 that is connected to the bottom surface periphery support portion 32 and supports the center side from the periphery of the filter 12. Has been. The support beam 33 connects two arc-shaped center support beam portions 33a arranged following the circular shape of the bell mouth 20a, and connects each arc-shaped center support beam portion 33a to the bottom surface peripheral support portion 32. 33b. The arc-shaped central support beam portion 33a is disposed at a position closer to the bell mouth 20a than the center of the bell mouth 20a.

  As described above, the filter support structure includes the bottom surface periphery support portion 32 that supports the periphery of the bottom surface of the filter 12, and the support beam 33 that is connected to the bottom surface periphery support portion 32 and supports the center side from the periphery of the filter 12. The support beam 33 has a center support beam portion 33a arranged following the shape of the bell mouth 20a, and the center support beam portion 33a is closer to the bell mouth 20a than the center of the bell mouth 20a, and The shape of the bell mouth 20a is imitated.

  As shown to Fig.5 (a), the ventilation force which passes the inside of the bellmouth 20a changes with positions in the bellmouth 20a. Specifically, the air blowing force in the bell mouth 20a is the largest at the center and gradually decreases from the center toward the periphery. In the present invention, since the support beam 33 is not supported near the center point of the filter 12 where the blowing force passing through the filter 12 is the largest, strong blowing does not hit the support beam 33, increasing the blowing resistance and generating noise. Can be suppressed as much as possible.

  As shown in FIG. 6, when the filter support beam is a square lattice (passes through substantially the center of the bellmouth), the filter support beam is a circular support beam portion (round lattice) and 30 from the center of the bellmouth 20a. In the case of a position outside the percentage (when the center of the bell mouth 20a is 0% and the distance from the center to the position of the bell mouth 20a is 100%), the filter support beam is a circular support beam portion (round lattice), and When the position is 50 percent outside the center of the bell mouth 20a, the filter support beam is a circular support beam portion (round lattice), and when the position is 100 percent outside the center of the bell mouth 20a, there is no support beam. The noise level was measured. From this measurement result, it was confirmed that the filter support beam is preferably a circular support beam (round lattice) rather than a square lattice, and the noise level becomes smaller as the distance from the center of the bell mouth 20a increases. Also, from this experimental result, it was confirmed that the noise level can be kept low if the central support beam portion 33a is a circular support beam and is located 50% or more outside the center of the bell mouth 20a. Furthermore, from this experimental result, it was confirmed that a position outside the center of the bell mouth 20a by 70 percent or more is more preferable. It was confirmed that the noise level was almost zero at a position between 70% and 100% from the center of the bellmouth 20a.

  As a modification, the central support beam portion 33a may be disposed at a position outside the main flow velocity of the air sucked by the bell mouth 20a. The air blowing power in the bell mouth 20a may vary depending on the circumferential direction of the wind speed distribution from the center of the bell mouth 20a to the position of the bell mouth 20a due to product variation or the like. Even if the central support beam 33a is installed on the same circumference with respect to the distance from the center to the bell mouth 20a, there is a possibility that the increase in blowing resistance and the generation of noise cannot be prevented. Therefore, if the central support beam portion 33a is disposed outside the main flow velocity of the air sucked by the bell mouth 20a, it is possible to prevent an increase in air blowing resistance and generation of noise.

  The central support beam portion 33a has a shape that follows the shape of the bell mouth 20a. The shape that follows the shape includes not only the same shape as the bell mouth 20a but also a shape close to this in the present specification. For example, when the bell mouth 20a is circular, it includes a polygon that is a hexagon or more.

  In the present embodiment, the bell mouth 20a has a circular shape when viewed from the upstream side of the air introduction passage 6. However, the present invention can also be applied to an elliptical shape or a scroll shape.

6 Air introduction passage 12 Filter 20a Bell mouth 21 Blower 32 Bottom edge support portion 33 Support beam 33a Center support beam portion

Claims (3)

A blower (21) is disposed in the air introduction passage (6), a bell mouth (20a) is provided on the suction side of the blower (21), and the air introduction passage (6) is provided from the bell mouth (20a). In the filter support structure of the vehicle air conditioner in which the filter (12) is disposed upstream of the filter and supports the filter (12),
A bottom edge support portion (32) that supports the periphery of the bottom surface of the filter (12), and a support beam (33) that is connected to the bottom edge support portion (32) and supports the center side from the periphery of the filter (12). And the support beam (33) has a center support beam portion (33a) arranged following the shape of the bell mouth (20a), and the center support beam portion (33a) is the bell A filter support structure for a vehicle air conditioner, characterized in that it has a shape that is close to the bell mouth (20a) from the center of the mouse (20a) and that follows the shape of the bell mouth (20a). . A filter support structure for a vehicle air conditioner according to claim 1,
The central support beam portion (33a) is disposed 70% or more outside the center of the bell mouth (20a) with respect to the distance from the center of the bell mouth (20a) to the bell mouth (20a). A filter support structure for a vehicle air conditioner. A filter support structure for a vehicle air conditioner according to claim 1,
The filter support structure for a vehicle air conditioner, wherein the central support beam portion (33a) is disposed outside a main flow velocity of air sucked by the bell mouth (20a).

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