JP2007327653A - Air conditioner for railroad vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve maintenance performance by preventing deformation at fin in high-pressure water cleaning without increasing passing resistance. <P>SOLUTION: In this roof installation type air conditioner for a railroad vehicle which comprises two refrigerating cycles composed of compressors 5, outdoor heat exchangers 6, pressure reducing devices and indoor heat exchangers 7 in a housing, and in which the heat exchangers are loaded in the housing in an inclined state, the outdoor heat exchangers 6 comprise heat transfer tubes 1 arranged in a plurality of rows in the air passing direction and fixed to the fins 2, and a distance from the front edge 3 of the fin 2 to the center of the heat transfer tube 1 of the front row is shorter than a distance from the rear edge 4 of the fin 2 to the tube center of the heat transfer tube 1 at the end of the row. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an air conditioner installed on the roof of a railway vehicle, and is particularly suitable for an air conditioner for a railway vehicle that reduces deformation of fins that occur when cleaning a heat exchanger and improves maintainability. .

  In order to prevent the deformation of the fins that occur when washing the heat exchanger with high-pressure water, the front grille side fins, which are upstream of the air flow, are provided with corrugated reinforcements, and the core part is deformed by the high-pressure water pressure It is known to prevent this, for example, as described in Patent Document 1.

JP 2002-372389 A

  The on-roof railroad vehicle air conditioner needs to install a housing in a space formed between the roof of the railcar and the tunnel ceiling. For this reason, downsizing of an air conditioner and a heat exchanger mounted on a railway vehicle is essential. Moreover, in the railway vehicle air conditioner, the heat exchanger is inclined and the number of rows of the heat exchangers is increased to achieve both expansion of the heat transfer area and suppression of the casing height. Therefore, with the increase in the number of rows of heat exchangers, the dimension in the row direction of the fins, which is the enlarged heat transfer surface, the so-called fin width is enlarged. As a result, the passage resistance generated when the fluid passes between the fins increases.

  Further, in the above prior art, the fin type is a plate or waffle fin type, which is a configuration in which a plurality of fins having the same shape are stacked, and high pressure water is required for cleaning. Is deformed, and the heat transfer performance of the heat exchanger is reduced.

  An object of the present invention is to prevent fin deformation during high-pressure water washing without increasing passage resistance and to improve maintainability.

  In order to solve the above-described problems, the present invention includes two refrigeration cycles formed by a compressor, an outdoor heat exchanger, a decompression device, and an indoor heat exchanger in a casing, and the heat exchanger is inclined in the casing. In the on-roof railroad vehicle air conditioner installed, the outdoor heat exchanger includes heat transfer tubes arranged in a plurality of rows in the air passage direction and fixed to the fins, and the front row from the front edge of the fins. The distance to the center of the heat transfer tube is made smaller than the distance from the rear edge of the fin to the tube center of the last heat transfer tube.

  ADVANTAGE OF THE INVENTION According to this invention, prevention of a deformation | transformation of a fin and the maintainability of a heat exchanger can be improved in the roof-mounted railway vehicle air conditioner.

FIG. 1 shows a side view and a top view of a heat exchanger according to one embodiment, and FIG. 2 shows an entire roof-mounted railway vehicle air conditioner.
An air conditioner for a railway vehicle is an outdoor heat exchanger composed of a heat transfer tube 1 made up of a number of tube groups as shown in FIG. 6 and an indoor heat exchanger 7, a compressor 5 for compressing and heating the refrigerant as shown in FIG. 2, an outdoor heat exchanger 6 for exchanging heat between the outdoor air and the refrigerant, and a decompression not shown Apparatus, indoor heat exchanger 7 for exchanging heat between indoor air and refrigerant, accumulator 8, outdoor blower 9 for guiding outdoor air to the indoor heat exchanger, conditioned air by guiding indoor air to the indoor heat exchanger The indoor blower 10 for blowing air into the room, the heat exchange cover 12 for protecting the outdoor heat exchanger, the fan guard 13 for protecting the outdoor fan, and the indoor unit cover 14 are formed. Moreover, the arrow in a figure has shown the flow direction of the high pressure water ejected when wash | cleaning a heat exchanger.

  As shown in FIG. 5, the front edge portion 3 and the rear edge portion 4 of the heat exchanger used in the conventional railway vehicle air conditioner are composed of Rp / 2, whereas in this example, as shown in FIG. The distance between the front edge 3 and the heat transfer tube 1 is 0.8 or more and less than 0.95 of Rp / 2, and the distance between the rear edge 4 and the heat transfer tube 1 is 1.05 or more of Rp / 2 and 1. Less than 2. Therefore, the rigidity of the fin is increased, and on the other hand, the heat transfer area is equivalent to that of the conventional heat exchanger, so that the heat transfer performance of the heat exchanger is not deteriorated.

  Furthermore, as shown in FIG. 5, the heat exchanger of the conventional railway vehicle air conditioner has a front edge portion 3 and a rear edge portion 4 formed continuously. Therefore, the heat exchanger of the conventional railway vehicle air conditioner is formed such that the distance between fins (fp) of the rear edge portion 4 and the distance between fins of the front edge portion 3 are equal. On the other hand, in the heat exchanger of the railway vehicle air conditioner of this example, the fins of the front edge portion 3 and the fins of the rear edge portion 4 are not continuously formed as shown in FIG. As a result, the heat exchanger is formed such that the inter-fin distance (fp) of the rear edge 4 is smaller than the inter-fin distance of the front edge 3. Thereby, the passage resistance generated when the high-pressure water passes through the fins of the front edge portion 3 can be reduced, and the high-pressure water can be circulated to the fins of the rear edge portion 4 without being blocked by the fins of the front edge portion 3. . For this reason, the heat exchanger of the railway vehicle air conditioner can be easily washed, for example, only by applying high-pressure water only from the front edge 3 side, dirt removal is excellent, and maintainability can be improved. Further, the high-pressure water that has passed between the fins is drained out of the casing through a drain trough (not shown) while retaining dirt adhered between the fins.

  FIG. 3 is an example when applied to an outdoor heat exchanger 6 of a railway vehicle air conditioner. As shown in the drawing, since the front edge portion 3 having high fin rigidity is located upstream of the high pressure water than the rear edge portion 4 having low fin rigidity, deformation of the heat exchanger can be reduced. Further, since the front edge portion 3 having a larger distance between the fins is located upstream of the rear edge portion 4 than the high pressure water, the passage resistance generated when the high pressure water passes between the fins can be reduced. The rest can be reduced.

  FIG. 4 is an example when applied to an indoor heat exchanger 7 of a railway vehicle air conditioner. In the case of the indoor heat exchanger 7, as in the case of the outdoor heat exchanger 6, the front edge portion 3 having high fin rigidity is located upstream of the high pressure water than the rear edge portion 4 having low fin rigidity. The deformation of the exchanger can be reduced. Further, since the front edge portion 3 having a large distance between the fins is positioned upstream of the rear edge portion 4 with respect to the high pressure water, it is possible to reduce the passage resistance generated when the high pressure water passes between the fins.

  As described above, the railway vehicle air conditioner can prevent the fins from being deformed by the high-pressure water. Moreover, since it is possible to reduce the passage resistance when high-pressure water passes between fins, high-pressure water can be circulated from the front edge of the fin to the rear edge. As a result, the maintainability of the railway vehicle air conditioner can be improved.

The side view and top view which show the heat exchanger of one Embodiment by this invention. The top view which shows the whole railway vehicle air conditioner by one Embodiment. The sectional side view which shows the outdoor heat exchanger part by one Embodiment. The sectional side view which shows the indoor heat exchanger part by one Embodiment. The side view and top view which show the conventional heat exchanger.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Heat exchanger tube, 2 ... Fin, 3 ... Front edge part, 4 ... Rear edge part, 5 ... Compressor, 6 ... Outdoor heat exchanger, 7 ... Indoor heat exchanger, 8 ... Accumulator, 9 ... Outdoor fan, 10 ... indoor blower, 11 ... electrical equipment, 12 ... heat exchange cover, 13 ... fan guard, 14 ... indoor unit cover.

Claims (4)

Air conditioning for railroad vehicles installed on the roof with two refrigeration cycles formed by a compressor, an outdoor heat exchanger, a pressure reducing device, and an indoor heat exchanger, and the heat exchanger tilted in the housing. In the device
The outdoor heat exchanger includes heat transfer tubes arranged in a plurality of rows in the air passing direction and fixed to the fins, and the distance from the front edge of the fins to the center of the heat transfer tubes in the front row A railcar air conditioner characterized in that it is smaller than the distance from the rear edge to the center of the heat transfer tube in the last row.   2. The distance from the front edge of the fin to the center of the heat transfer tube in the foremost row is 0.8 or more with respect to a value of ½ of the distance between the centers of the heat transfer tubes. A railcar air conditioner characterized by being less than .95.   2. The distance from the rear edge of the fin to the tube center of the last heat transfer tube is not less than 1.05 with respect to a value ½ of the center-to-center distance of the heat transfer tube. An air conditioner for railway vehicles characterized by being less than .2.   2. The fin according to claim 1, wherein a plurality of fins having different widths in the air passage direction are stacked, and a distance between fins of the front edge portion is larger than a distance between fins of the rear edge portion. A railway vehicle air conditioner characterized by being combined as described above.

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