JP2006273099A - External duct structure for vehicular air-conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an external duct structure for a vehicular air-conditioner suppressing noise and improving reliability. <P>SOLUTION: The external duct structure for a vehicular air-conditioner comprises a bottom plate 17; a pair of partitioning plates 18, 19 provided on both side portions of the bottom plate 17; beams 22, 23 provided on upper parts of the partitioning plates 18, 19; an upper surface cover 29 covering the bottom plate 17 and the partitioning plates 18, 19; condensers 26, 27 and an external blower 28 provided in a space formed by the upper surface cover 29, the bottom plate 17, and the partitioning plates 18, 19; and a wind tunnel 24 sending air by the external blower 28. A plate connected to the wind tunnel 24 and covering the beams 22, 23 is vertically bent upward near a standing portion of the wind tunnel, and an upper end portion is formed in a shape along an inner surface of the upper surface cover 29. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an outdoor duct structure of a vehicle air conditioner mounted mainly on the ceiling of a vehicle such as a train.

Conventionally, there are many improvements mainly due to the shape of the blower wind tunnel part, with respect to the improvement in noise and efficiency of an air conditioner mounted on the ceiling of a train or the like. (For example, see Patent Document 1)
However, improvement in noise and reliability is hardly seen by improving the structure of the air conditioner, in particular, the overall outdoor duct structure in the air conditioner for a vehicle that tends to increase in size.
JP-A-8-85454 (paragraph numbers [0010], [0011], FIG. 1)

The outdoor duct structure used in air conditioning equipment for vehicles such as trains is defined in Chapter 8 and Section 1 of the Ministerial Ordinance that defines the technical standards for railways, such as the R shape of the top cover and bottom plate. Although it is an example of the shape based on the vehicle limit, the difference in height between the top cover and the bottom plate cannot be provided beyond the vehicle limit.
Therefore, if a larger cooling capacity is required under this constraint, the condensers already provided with an inclination and the size of the condensers must be increased in the longitudinal direction.
As the longitudinal size of the condenser is increased, the cover plates that cover them are also made larger, and widening the plate size poses problems of resonance and noise of the entire air conditioning apparatus.
As this measure, the measure by the improvement of the conventional wind tunnel alone cannot be dealt with sufficiently,
There is a strong demand for improved countermeasures for the entire outdoor duct structure.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain an outdoor duct structure of a vehicle air conditioner that suppresses noise and improves reliability.

An outdoor duct structure for a vehicle air conditioner according to the present invention includes a bottom plate, a pair of partition plates provided on both sides of the bottom plate, first beams provided on both ends of the partition plate, and the partition plate. Provided in the space formed by the second beam provided on the upper surface, the upper surface cover covering the partition plate and the first and second beams, the upper surface cover, the bottom plate, and the partition plate. In the outdoor duct structure of the vehicle air-conditioning apparatus comprising a condenser and an outdoor fan, and a wind tunnel for sending out the air blown by the outdoor fan,
A plate member joined to the wind tunnel and covering the second beam, the plate member has a bent portion bent vertically upward in the vicinity of the rising portion of the wind tunnel, and an upper end portion of the bent portion is the upper surface The shape is formed along the inner surface of the cover.

  In the present invention, the plate member joined to the wind tunnel and covering the second beam is bent vertically upward in the vicinity of the rising portion of the wind tunnel so that the upper end portion is shaped along the inner surface of the upper surface cover, and the most resonance and vibration By making the plate member joined to the wind tunnel that is easy to generate a box-shaped body with high rigidity, it is possible to provide a highly reliable vehicle air conditioner that is less likely to resonate and has low noise.

Embodiment 1 FIG.
FIG. 1 is an explanatory view showing an outdoor duct structure of a vehicle air conditioner according to Embodiment 1 of the present invention, where FIG. 1 (a) is a top cover, FIG. 1 (b) is an air conditioner body, and FIG. ) Indicates the bottom plate, respectively. FIG. 2 is an explanatory view showing a cross section of FIG. FIG. 3 is an exploded view of the box shape of FIG.

  1, 2 and 3, 17 is a bottom plate, 18 and 19 are partition plates, 20, 21, 22 and 23 are beams, 24 is a wind tunnel, 25 is a box-shaped body, 26 and 27 are condensers, and 28 is a condenser A blower, 29 is an upper surface cover, 30 and 31 are upper ends of the beams, 32 is a square hole for ventilation on the blower side, 33 and 34 are square holes for ventilation on the condenser side, and 35 and 36 are bent portions.

  As shown in FIGS. 1 and 2, in this outdoor duct structure, side-by-side partition plates 18 and 19 joined by spot welding or the like above the R-side ends of an R-shaped bottom plate 17; Beams 20 and 21 in which one end of the plates 18 and 19 and one end of the bottom plate 17 are joined by spot welding or the like, and beams 22 and 23 in which the upper portions of both partition plates 18 and 19 are joined by spot welding or the like And a condenser 26 provided in the space between the beams 20 and 22 and the partition plates 18 and 19, and another condenser 27 provided in the space between the beams 21 and 23 and the partition plates 18 and 19. It has.

  A blower 28 and a wind tunnel 24 are provided at the center of the top of the bottom plate 17, and the partitions among the parallel beams 20, 21, 22, 23 that are spot-welded to the upper portion and both ends of the partition plates. The plate 9 that covers the beams 22 and 23 located at the upper part of the plate and whose central part is connected to the wind tunnel 24 is positioned at an interval that sandwiches the wind tunnel in the direction of both partition plates in the vicinity of the wind tunnel rising portion. Bending portions 35 and 36 are provided to form a box-shaped body 25. The top shapes of the bent portions 35 and 36 are shapes along the inner surface of the upper cover that covers the R-shaped portion at the top of the partition plates.

  The box-shaped body 25 is fixed to the upper surface of the beam 22 and the upper surface of the beam 23 with bolts or the like. Each part is joined by rivets or spot welding or the like, and the upper surface cover 29 is fixed along the upper end R of the partition plate 18 and the upper end R of the partition plate 19.

  Further, as shown in FIG. 1, the surface of the upper surface cover 29 has a hole shape in which an opening area larger than the area in the wind tunnel is projected on the cover, and a net-like blower formed in, for example, a staggered or mesh shape inside the hole. A side ventilation square hole 32 is provided. Further, the cover portion surrounded by the upper end R of the partition plate 18 and the upper end R of the partition plate 19 and the upper end 30 and the upper end of the beam 20 has a mesh-shaped condenser side square hole 33 for ventilation, and similarly the upper end R of the partition plate 18 and the partition plate. 19 A cover portion surrounded by the upper end R and the upper end 31 and the upper end of the beam 21 is formed with a mesh-shaped condenser side square hole 34 for ventilation. The box-shaped body 25 may have a cylindrical shape or a polygonal shape.

  The cross-sectional view of FIG. 2 is a cross-sectional explanatory view of the cut through the center of the wind tunnel 24 in the direction of the condenser 26 and the condenser 27 as viewed from the normal direction of the partition plate 18, and when the blower 28 is operated. Air is sucked from the mesh-shaped condenser side ventilation square holes 33, 34 on the surface of the outdoor upper surface cover 29, passes through the condenser 26 and the condenser 27, and passes through the wind tunnel 24 from the inside of the wind tunnel 24. It blows out from the square hole 32. The wind flow may be reversed.

As shown in FIG. 3, the box-shaped body 25 constitutes bent portions 35 and 36 bent in the vicinity of the rise of the wind tunnel 24, and the bent portions 35 and 36, the wind tunnel 24, the beams 20 to 23, and both partitions The top ridge R shape of the box-shaped body 25 constituted by the plates 18 and 19 has a shape along the inner surface of the top cover 29, and each portion is joined by spot welding or the like to maintain rigidity and each joining. The part is sealed by packing so that there is no air leakage.
At this time, the rigidity of the box-shaped body 25 is improved, and the rigidity and vibration of the conventional flat and large area plate can be prevented by the improvement of the rigidity.

  The outdoor duct structure of the vehicle air conditioner according to Embodiment 1 was created, and the noise relative to the duct structure of the comparative example (conventional) was compared and measured. In addition, the duct structure of the comparative example (conventional) is a structure as shown in FIG. 4, and there is no configuration corresponding to the box-shaped body 25 in comparison with FIG. 1.

Structure of Example 1 (see FIG. 3)
The shape of the box-shaped body 25: length X 1900 mm × width Y 790 mm
Total length X2: 2018mm
Comparative example (conventional) duct structure: (see FIG. 7)
Shape of plate 9: width Y790 mm × total length X22018 mm
Blower: Propeller fan type blower Blade diameter D750 mm x Number of blades N6 Note that the blower, the condenser, the bottom plate, the partition plate, the beam, the top cover and the like are the same as those in the first embodiment and the conventional duct structure.

  FIG. 5 is a diagram showing a result of comparative measurement of noise by the vehicle air conditioning outdoor duct structure according to Example 1 of the present invention and the comparative example (conventional) duct structure. The characteristic of FIG. 5 is the result of measuring noise at a position 1000 mm in height from the surface of the outdoor top cover blowout center. As is clear from FIG. 5, in the case of the vehicle air conditioning outdoor duct structure according to the first embodiment. Compared with the duct structure of the comparative example (conventional), the noise is reduced in a frequency band of 80 Hz or higher.

  FIG. 6 is a diagram showing the result of frequency analysis of the response waveform in the plate 9 during the operation of the duct structure of the comparative example (conventional). As can be seen from FIG. 6, the result of frequency analysis of the response waveform in the plate 9 during operation of the conventional duct structure has resonance with peak values at about 120 Hz, about 240 Hz, about 340 Hz, and about 460 Hz.

  FIG. 7 is a diagram illustrating a result of frequency analysis of a response waveform in the box-shaped body 25 during operation of the vehicle air conditioning outdoor duct structure according to the first embodiment. In FIG. 7, the result of frequency analysis of the response waveform in the box-shaped body 25 during operation of the vehicle air conditioning outdoor duct structure according to Example 1 shows that the box-shaped body 25 resonates with peak values only at about 120 Hz and about 240 Hz. ing.

  That is, when FIG. 6 is compared with FIG. 7, resonance does not occur at about 340 Hz and about 460 Hz. Therefore, the shape of the conventional plate 9 having a wide surface and easily corrugated is changed to the box-shaped body 25 of the first embodiment. It was confirmed that the improvement made it difficult to resonate and the noise was reduced.

It is explanatory drawing which shows the vehicle outside air-conditioning outdoor duct part structure in Embodiment 1 of this invention, (a) is an upper surface cover, (b) is an air-conditioner main body, (c) is a bottom plate. It is explanatory drawing which shows the bending part position of FIG. It is explanatory drawing which shows the cross section of FIG. It is explanatory drawing which shows the outdoor duct part structure for vehicle air conditioning of a comparative example (conventional), (a) is an upper surface cover, (b) is an air conditioner main body, (c) is a bottom plate. It is a figure which shows the result of having compared and measured the noise by Example 1 of this invention, and the conventional vehicle air conditioning outdoor duct part structure. It is a figure which shows the result of having analyzed the frequency of the response waveform by the outdoor duct part structure for vehicle air conditioning of a comparative example (conventional). It is a figure which shows the result of having analyzed the frequency of the response waveform by Example 1 of this invention.

Explanation of symbols

1,17 Base plate, 2, 3, 18, 19 Partition plate, 4, 5, 6, 7, 20, 21, 22, 23 Beam, 8, 24 Wind tunnel, 9 plate, 10, 11, 26, 27 Condenser, 12, 28 Blower, 13, 29 Top cover, 14, 32 Blower side ventilation square hole, 15, 16, 33, 34 Condenser side ventilation square hole, 25 Box-shaped body, 30, 31 Upper end of beam, 35 36 bending parts.

Claims (1)

A bottom plate, a pair of partition plates provided on both sides of the bottom plate, a first beam provided on both ends of the partition plate, a second beam provided on an upper portion of the partition plate, and the partition A top cover that covers the plate and the first and second beams, a condenser and an outdoor fan provided in a space formed by the top cover, the bottom plate, and the partition plate, and a wind tunnel that sends out air blown by the outdoor fan In the outdoor duct structure of the vehicle air conditioning device with
A plate member joined to the wind tunnel and covering the second beam, the plate member has a bent portion bent vertically upward in the vicinity of the rising portion of the wind tunnel, and an upper end portion of the bent portion is the upper surface An exterior duct structure for a vehicle air conditioner, characterized in that it is shaped along the inner surface of the cover.

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