JP2009264626A - Defrosting device for heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a defrosting device effective even to a heat exchanger having a curved section. <P>SOLUTION: This defrosting device for the heat exchanger for mechanically removing frost attached to a cross fin coil type heat exchanger 26 having plane sections 26a, 26b and the curved section 26c, is composed of a brush 3 disposed corresponding to a part of high heat exchanging performance, of the heat exchanger 26 and inserted among fins 1, constituting the heat exchanger 26 to scrape off the frost from among the fins 1 and a moving means 4 for moving the brush 3 along clearances among the fins 1. Since much frost is formed on the part of high heat exchanging performance in the cross fin coil type heat exchanger 26 having the plane section 26a and the curved section 26c, the heat exchanging performance of the part can be easily recovered by mechanically removing the frost on the part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a defroster for a heat exchanger, and more particularly to a defroster for a heat exchanger that removes frost adhering to a cross fin coil type heat exchanger having a flat portion and a curved portion. .

  As shown in FIG. 8, a general air conditioner outdoor unit divides a casing 21 having a rectangular shape in plan view into a machine room 23 and a heat exchange chamber 24 by a partition wall 22. While the compressor 30 and the like are disposed, an L-shaped heat exchanger 26 along the air inlet 25 formed on the back side and the side surface of the casing 21 is provided in the heat exchange chamber 24. A fan 28 facing the air outlet 27 formed on the front side of the casing 21 is disposed. The heat exchanger 26 includes two flat portions 26a and 26b and a curved portion 26c that connects the two flat portions 26a and 26b. In FIG. 8, reference numeral 29 denotes a fan motor serving as a drive source for the fan 28.

  In the case of a heat exchanger used in an outdoor unit for an air conditioner having the above configuration, it functions as an evaporator during winter heating operation, but when the outside air temperature is low, frost adheres to the heat exchanger, The heat exchange efficiency may be greatly reduced.

  As the heat exchanger, a cross fin coil type heat exchanger constituted by a large number of fins arranged side by side with a predetermined gap and a heat transfer tube passing through the fins is adopted. When a heat exchanger with a different configuration is operated as an evaporator, if the outside air temperature is low, frost formation occurs on the fin surface, reducing the heat transfer performance between the fin and air, and gradually increasing the fin according to its growth. The pitch is narrowed and the air flow is reduced. The decrease in the ventilation rate further promotes the growth of frost. As a result, the heat exchange efficiency is lowered, and the condensation efficiency (for example, heating performance) of the use side heat exchanger (for example, the indoor heat exchanger) is lowered. In addition, if frost formation is left unattended, in addition to a decrease in the amount of heat exchange, there is a risk of causing an abnormal drop in evaporating pressure and liquid return to the compressor. Become.

  Conventionally, as a defrosting device that removes frost adhered to the heat exchanger having the above-described configuration, a mechanical defrosting method that mechanically removes frost using a brush or the like is well known (for example, Patent Document 1).

JP-A-11-201593

  In the case of the mechanical defrosting method disclosed in Patent Document 1, it works effectively on the flat portion of the heat exchanger, but cannot act on the curved portion of the heat exchanger. There is a defect.

  This invention is made | formed in view of said point, and aims at providing an effective defrosting apparatus also with respect to the heat exchanger which has a curved part.

  In the present invention, as a first means for solving the above-mentioned problem, heat exchange that mechanically removes frost attached to the cross fin coil type heat exchanger 26 having the flat portions 26a, 26b and the curved portion 26c. In the defrosting device of the heat exchanger, the heat exchanger 26 is disposed corresponding to a portion having high heat exchange performance, and is inserted between the fins 1, 1. 1 comprises a brush 3 that scrapes off frost between the... And a moving means 4 that moves the brush 3 along a gap between the fins 1, 1.

  By configuring as described above, in the cross fin coil type heat exchanger 26 having the flat portions 26a, 26b and the curved portion 26c, a lot of frost formation occurs in a portion having high heat exchange performance. By mechanically removing the frost formation in the part, the heat exchange performance of the part can be easily restored. Therefore, the heat exchange performance in the cross fin coil type heat exchanger 26 can be maintained well over a long period of time. Moreover, the brush 3 is inserted between the fins 1, 1... Constituting the heat exchanger 26 to scrape frost between the fins 1, 1. Since the frost removal is performed by the defroster including the moving means 4 that moves along the gap, the frost removal can be performed with a simple device.

  In the present invention, as a second means for solving the above-described problem, in the defroster for a heat exchanger provided with the first means, the brush 3 is configured to be rotated by a rotating shaft 3a. In such a configuration, the brush 3 is attached to the heat exchanger 26 only by moving along the gap between the fins 1, 1. The frost can be removed, and the defrosting can be performed more easily and reliably.

  In the present invention, as a third means for solving the above problems, in the defroster for a heat exchanger provided with the first or second means, the brush 3 is connected to the heat exchanger 26. It can also arrange | position corresponding to only the part with the longest effective length among plane part 26a, 26b, and when comprised in that way, it is set to the part with the longest effective length among plane parts 26a, 26b in the heat exchanger 26. Since the adhering frost is removed by the brush 3, the heat exchange performance in the longest effective portion of the flat portions 26a and 26b in the heat exchanger 26 is easily restored, and the cross fins can be obtained with a simple device. The heat exchange performance in the coil type heat exchanger 26 can be maintained well over a long period of time.

  In the present invention, as a fourth means for solving the above problems, in the defroster for a heat exchanger provided with the first or second means, the brush 3 is connected to the heat exchanger 26. It can also arrange | position corresponding only to the plane parts 26a and 26b, and when it is comprised in that way, in the heat exchanger 26, the frost adhering to the plane parts 26a and 26b with which the brush 3 can remove frosting easily is Therefore, the heat exchange performance of the cross fin coil type heat exchanger 26 can be maintained well over a long period of time with a simple device.

  In the present invention, as a fifth means for solving the above-mentioned problem, in the defroster for a heat exchanger provided with the first, second, third or fourth means, the heat exchanger 26 The moving means 4 can also be arranged corresponding to the curved portion 26c in the case, and in such a configuration, the arrangement space of the moving means 4 can be easily secured.

  In the present invention, as a sixth means for solving the above-mentioned problems, in the defroster for a heat exchanger comprising the first, second, third, fourth or fifth means, the heat The bending portion brush 8 inserted between the fins 1, 1... In the bending portion 26c of the exchanger 26 to scrape the frost between the fins 1, 1,. , 1.. Can be provided with a defrosting means Y for the curved portion constituted by the drive means 4 that moves along the gap between them, and in such a case, in the cross fin coil type heat exchanger 26 The frost formation on the bending portion 26c can be removed by the bending portion defrosting means Y, and the heat exchange performance in the heat exchanger 26 can be maintained better over a long period of time.

  According to the first means of the present invention, in the defroster for a heat exchanger that mechanically removes frost attached to the cross fin coil type heat exchanger 26 having the flat portions 26a, 26b and the curved portion 26c. The heat exchanger 26 is arranged corresponding to a portion having high heat exchange performance, and is inserted between the fins 1, 1... Constituting the heat exchanger 26, and the frost between the fins 1, 1. Of a cross fin coil type comprising a flat portion 26a and a curved portion 26c. The brush 3 scrapes off the brush 3 and the moving means 4 for moving the brush 3 along the gap between the fins 1, 1. In the heat exchanger 26, since a lot of frost formation occurs in a portion having high heat exchange performance, the heat exchange performance of the portion can be easily restored by mechanically removing the frost formation in the portion. In Since the so that, there is an advantage that it is possible to maintain good across the heat exchange performance in the cross fin coil type heat exchanger 26 to the long term. Moreover, the brush 3 is inserted between the fins 1, 1... Constituting the heat exchanger 26 to scrape frost between the fins 1, 1. Since the frost removal is performed by the defrosting device provided with the moving means 4 that moves along the gap, an effect that the frost removal can be performed with a simple device is also obtained.

  As in the second means of the present invention, in the defroster of the heat exchanger provided with the first means, the brush 3 can be configured to be rotated by the rotating shaft 3a, and as such When configured, the frost adhering to the heat exchanger 26 can be removed simply by moving the brush 3 along the gap between the fins 1, 1. Can be performed more easily and reliably.

  As in the third means of the present invention, in the defroster for a heat exchanger provided with the first or second means, the brush 3 is the most of the flat portions 26a and 26b in the heat exchanger 26. It can also arrange | position corresponding to only the part with long effective length, and when it is comprised in that way, the frost adhering to the part with the longest effective length is removed by the brush 3 in the plane parts 26a and 26b in the heat exchanger 26. Therefore, the heat exchange performance in the portion having the longest effective length among the flat portions 26a and 26b in the heat exchanger 26 is easily restored, and in the cross fin coil type heat exchanger 26 with a simple device. The heat exchange performance can be maintained well over a long period of time.

  As in the fourth means of the present invention, in the defroster of the heat exchanger provided with the first or second means, the brush 3 corresponds only to the flat portions 26a and 26b in the heat exchanger 26. In such a configuration, the frost attached to the flat portions 26a and 26b, which is easy to remove frost by the brush 3 in the heat exchanger 26, is removed by the brush 3, so that it is simple. With such a device, the heat exchange performance of the cross fin coil type heat exchanger 26 can be maintained well over a long period of time.

  As in the fifth means of the present invention, in the defroster for a heat exchanger provided with the first, second, third or fourth means, it corresponds to the curved portion 26c in the heat exchanger 26. The moving means 4 can also be arranged, and in such a configuration, the arrangement space of the moving means 4 can be easily secured.

  As in the sixth means of the present invention, in the defroster of the heat exchanger provided with the first, second, third, fourth or fifth means, in the curved portion 26c of the heat exchanger 26 The bending portion brush 8 inserted between the fins 1, 1... Scrapes off the frost between the fins 1, 1, and the bending portion brush 8 in the gap between the fins 1, 1. The bending means defrosting means Y constituted by the drive means 4 moved along can be provided, and in such a case, frost formation on the bending part 26c in the cross fin coil type heat exchanger 26 is prevented. It can be removed by the defrosting means Y for the curved portion, and the heat exchange performance in the heat exchanger 26 can be maintained even better over a long period of time.

  Hereinafter, several preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  The heat exchanger to which this defrosting apparatus is applied is used for the outdoor unit for air conditioners shown in FIG. As shown in FIG. 8, the outdoor unit for an air conditioner partitions a casing 21 having a rectangular shape in a plan view into a machine room 23 and a heat exchange chamber 24 by a partition wall 22. While a compressor 30 and the like are disposed, an L-shaped heat exchanger 26 along the air suction port 25 formed on the back surface side and the side surface side of the casing 21 and the casing are disposed in the heat exchange chamber 24. A fan 28 that is opposed to an air outlet 27 formed on the front side of 21 is disposed. The heat exchanger 26 includes two flat portions 26a and 26b and a curved portion 26c that connects the two flat portions 26a and 26b. In FIG. 8, reference numeral 29 denotes a fan motor serving as a drive source for the fan 28.

  As shown in FIG. 1, the heat exchanger 26 includes a large number of fins 1, 1... Arranged in parallel with a predetermined gap and heat transfer tubes 2 penetrating the fins 1, 1. The cross fin coil type heat exchanger.

  When the heat exchanger 26 having such a configuration is operated as an evaporator, if the outside air temperature is low, frost forms on the surfaces of the fins 1, 1,..., And heat transfer performance between the fins 1, 1,. The fin pitch is gradually narrowed according to the growth, and the air flow rate is reduced. The decrease in the ventilation rate further promotes the growth of frost. As a result, the heat exchange efficiency is lowered, and the condensation efficiency (for example, heating performance) of the use side heat exchanger (for example, the indoor heat exchanger) is lowered. In addition, if frost formation is left unattended, in addition to a decrease in the amount of heat exchange, there is a risk of causing an abnormal drop in evaporating pressure and liquid return to the compressor. Become.

  Therefore, a defrosting device for removing frost attached to the heat exchanger 26 is required. The present invention relates to this defrosting apparatus.

First Embodiment FIGS. 1 to 3 show a defroster for a heat exchanger according to a first embodiment of the present invention.

  As shown in FIGS. 1 and 2, the defroster X has a longest effective portion of the flat portions 26 a and 26 b in the cross fin coil type heat exchanger 26 (that is, the suction side of the fan 28). Are arranged in correspondence with only the flat part 26a) facing each other. In other words, in the cross fin coil type heat exchanger 26, it is arrange | positioned corresponding to the part with high heat exchange performance. The defrosting apparatus X includes a brush 3 inserted between the fins 1, 1... Constituting the heat exchanger 26 to scrape frost between the fins 1, 1. It is comprised by the moving means 4 to which it moves along the clearance gap between the said fins 1, 1, .... In this case, as shown in FIG. 3, the brush 3 is a rotating brush configured by flocking a large number of hairs 5,. 1 and 2, reference numeral 6 denotes a motor serving as a drive source for rotationally driving the rotary shaft 3a.

  With the above configuration, in the cross fin coil type heat exchanger 26 having the flat portions 26a and 26b and the curved portion 26c, the longest effective portion of the flat portions 26a and 26b (ie, heat Since a lot of frost is generated in a portion having a high exchange performance), the portion (that is, the portion indicated by the arrow A) is mechanically removed to thereby remove the portion (that is, the flat portions 26a and 26b). Among these, the heat exchange performance of the longest effective portion) can be easily restored. Therefore, the heat exchange performance in the cross fin coil type heat exchanger 26 can be maintained well over a long period of time. In addition, since the frost formation to the other side (namely, the plane part 26b with a shorter effective length) in the heat exchanger 26 is small, the heat of the heat exchanger 26 as a whole can be obtained without removing the frost in the part. The impact on exchange performance is considered to be small. Moreover, the brush 3 is inserted between the fins 1, 1... Constituting the heat exchanger 26 to scrape frost between the fins 1, 1. The frost removal is performed by the defroster X provided with the moving means 4 that moves along the gap, and the frost removal can be performed with a simple device. Further, since the brush 3 is configured to be rotated by the rotating shaft 3a, the brush 3 is rotated in a state where the brush 3 is inserted between the fins 1, 1,. The frost adhering to the heat exchanger 26 can be removed simply by moving it, and the defrosting can be performed more easily and reliably. In addition, the brush 3 which comprises the defrosting apparatus X can also be made into the toothbrush-like thing comprised by planting many bristles 5,5 ... in the support member 7, as shown in FIG. In this case, the defrosting effect may be inferior to the rotating brush type.

Second Embodiment FIG. 5 shows a defroster for a heat exchanger according to a second embodiment of the present invention.

  In this case, the brush 3 is arrange | positioned corresponding to only the plane parts 26a and 26b in the heat exchanger 26 of a cross fin coil type. Also in this case, as shown in FIG. 3, the brush 3 is a rotating brush configured by flocking a plurality of hairs 5, 5... Around the rotating shaft 3a. Rotating shafts 3a and 3a for rotating the motor are provided with motors 6 and 6 as driving sources. And the moving means 4 which moves the two brushes 3 and 3 corresponding to the curved part 26c in the heat exchanger 26 is arrange | positioned. If it does in this way, since the frost adhering only to plane part 26a, 26b (namely, the part shown by arrow A, B) in the heat exchanger 26 will be removed by the brushes 3 and 3, removal of frost formation by the brush 3 will be carried out. Therefore, the frost formation on the flat portions 26a and 26b can be easily removed, and the heat exchange performance of the cross fin coil type heat exchanger 26 can be maintained well over a long period of time with a simple device. In addition, it is possible to easily secure an arrangement space for the moving means 4 for moving the two brushes 3 and 3. In addition, the brush 3 which comprises the defrosting apparatus X can also be made into the toothbrush-like thing comprised by planting many bristles 5,5 ... in the support member 7, as shown in FIG. In this case, the defrosting effect may be inferior to the rotating brush type. Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.

Third Embodiment FIG. 6 shows a defroster for a heat exchanger according to a third embodiment of the present invention.

  In this case, the brush 3 is arrange | positioned corresponding to only the plane parts 26a and 26b in the heat exchanger 26 of a cross fin coil type. Also in this case, as shown in FIG. 3, the brush 3 is a rotating brush configured by flocking a large number of hairs 5, 5... Around the rotating shaft 3a. 6 is shared by both brushes 3 and 3, and a flexible joint or a gear box is used. Also in this case, the moving means 4 for moving the two brushes 3 and 3 is arranged corresponding to the curved portion 26c in the heat exchanger 26. If it does in this way, since the frost adhering only to plane part 26a, 26b (namely, the part shown by arrow A, B) in the heat exchanger 26 will be removed by the brushes 3 and 3, removal of frost formation by the brush 3 will be carried out. Therefore, the frost formation on the flat portions 26a and 26b can be easily removed, and the heat exchange performance of the cross fin coil type heat exchanger 26 can be maintained well over a long period of time with a simple device. In addition, it is possible to easily secure an arrangement space for the moving means 4 for moving the two brushes 3 and 3. In addition, the brush 3 which comprises the defrosting apparatus X can also be made into the toothbrush-like thing comprised by planting many bristles 5,5 ... in the support member 7, as shown in FIG. In this case, the defrosting effect may be inferior to the rotating brush type. Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.

Fourth Embodiment FIG. 7 shows a defroster for a heat exchanger according to a fourth embodiment of the present invention.

  In this case, the brush 3 is arrange | positioned corresponding to only the plane parts 26a and 26b in the heat exchanger 26 of a cross fin coil type. Also in this case, as shown in FIG. 3, the brush 3 is a rotating brush configured by flocking a large number of hairs 5, 5... Around the rotating shaft 3a. 6 is shared by both brushes 3 and 3, and a flexible joint or a gear box is used. Also in this case, the moving means 4 for moving the two brushes 3 and 3 is arranged corresponding to the curved portion 26c in the heat exchanger 26. Further, in this case, the bending portion brush 8 that is inserted between the fins 1, 1... In the bending portion 26 c of the heat exchanger 26 and scrapes off the frost between the fins 1, 1. The bending portion defrosting means Y constituted by the moving means 4 for moving the brush 8 along the gap between the fins 1, 1,... Is attached. The moving means 4 is shared with the moving means for moving the brushes 3, 3. In this case, as the bending portion brush 8, as shown in FIG. 4, a toothbrush-like one configured by implanting a large number of hairs 5, 5. If it does in this way, while the frost adhering to plane part 26a, 26b (namely, the part shown by arrow A, B) in the heat exchanger 26 will be removed by the brushes 3 and 3, the frost adhering to the bending part 26c will bend. Since it will be removed by the defrosting means Y for a part, the heat exchange performance in the cross fin coil type heat exchanger 26 can be satisfactorily maintained over a long period of time with a simple device. In addition, it is possible to easily secure an arrangement space for the moving means 4 for moving the two brushes 3 and 3 and the bending portion brush 8. In addition, the brush 3 which comprises the defrosting apparatus X can also be made into the toothbrush-like thing comprised by planting many bristles 5,5 ... in the support member 7, as shown in FIG. In this case, the defrosting effect may be inferior to the rotating brush type. Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.

  The invention of the present application is not limited to the above-described embodiments, and it goes without saying that the design can be changed as appropriate without departing from the scope of the invention.

It is a perspective view which shows the defrosting apparatus of the heat exchanger concerning 1st Embodiment of this invention. It is a top view which shows the defrosting apparatus of the heat exchanger concerning 1st Embodiment of this invention. It is a principal part expansion perspective view of the rotating brush in the defroster of the heat exchanger concerning 1st Embodiment of this invention. It is a principal part expansion perspective view which shows the other example of the brush in the defrosting apparatus of the heat exchanger concerning 1st Embodiment of this invention. It is a top view which shows the defroster of the heat exchanger concerning 2nd Embodiment of this invention. It is a top view which shows the defroster of the heat exchanger concerning 3rd Embodiment of this invention. It is a top view which shows the defroster of the heat exchanger concerning 4th Embodiment of this invention. It is a cross-sectional top view of the common outdoor unit for air conditioners.

Explanation of symbols

1 is a fin, 2 is a heat transfer tube, 3 is a brush, 3a is a rotating shaft, 4 is a moving means, 5 is a hair, 6 is a motor, 7 is a support member, 8 is a brush for a bending portion, 26 is a heat exchanger, 26a and 26b are flat portions, and 26c is a bending portion. Is defrosting device Y is defrosting means for curved part

Claims (6)

  A defroster for a heat exchanger that mechanically removes frost adhering to a cross fin coil type heat exchanger (26) having flat portions (26a), (26b) and a curved portion (26c), The heat exchanger (26) is arranged corresponding to a portion having high heat exchange performance, and is inserted between the fins (1), (1),... Constituting the heat exchanger (26). 1), a brush (3) for scraping frost between (1), and a moving means (4) for moving the brush (3) along the gap between the fins (1), (1),. And a heat exchanger defrosting device.   The defroster for a heat exchanger according to claim 1, wherein the brush (3) is configured to be rotated by a rotating shaft (3a).   The said brush (3) is arrange | positioned corresponding to only a part with the longest effective length among the plane parts (26a), (26b) in the said heat exchanger (26), The characterized by the above-mentioned. The defroster of the heat exchanger as described in any one of Claims.   The heat exchange according to any one of claims 1 and 2, characterized in that the brush (3) is arranged corresponding to only the flat portions (26a), (26b) in the heat exchanger (26). Defrosting device.   The heat exchanger according to any one of claims 1, 2, 3 and 4, wherein the moving means (4) is arranged corresponding to the curved portion (26c) of the heat exchanger (26). Defrosting device.   For the bending portion that is inserted between the fins (1), (1),. Bending part defrosting means comprising a brush (8) and driving means (4) for moving the bending part brush (8) along the gap between the fins (1), (1). The defroster for a heat exchanger according to any one of claims 1, 2, 3, 4 and 5, wherein Y) is provided.

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