JP2009257648A - Heat exchanger for refrigerating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent attachment of frost to a defrosting brush or to remove the frost in a heat exchanger for a refrigerating device wherein the frost attaching to a heat exchange fin of the heat exchanger is mechanically removed by the defrosting brush. <P>SOLUTION: This heat exchanger includes a fin defrosting means for mechanically removing the frost attaching to the heat exchange fin 1 by the defrosting brush 5, and a brush defrosting means for removing the frost attaching to the defrosting brush 5, and/or a brush frost formation preventing means for preventing frost formation on the defrosting brush. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a heat exchanger for a refrigeration apparatus in which frost adhering to a heat exchange fin is forcibly removed with a defrosting brush.

  In a refrigeration system such as an air conditioner, when the outdoor heat exchanger on the refrigeration circuit functions as an evaporator (heating operation, etc.) in the refrigeration circuit in the winter, if the outside air temperature is low, the heat source side Frost adheres to the heat transfer fins of the outdoor heat exchanger, greatly reducing the heat exchange efficiency.

  FIG. 8 and FIG. 9 show such a frost adhesion state as an example of the case of the cross fin coil type outdoor heat exchanger 10 adopting the plate fin 1, for example.

  8 and 9, reference numerals 1, 1... Are a plurality of plate fins, 2a, 2b, 2a, 2b... Are the heat transfer tubes on the front row side and the rear row side. The fins 1, 1... Are fitted in a cross state into the heat transfer tubes 2a, 2b, 2a, 2b,... In the two front and rear rows through heat transfer tube fitting holes (not shown) of the fin collar portions. Mounted and fixed side by side with a predetermined fin pitch for forming an air passage.

  For example, a blower such as a propeller fan that sucks air in the direction of the arrow through the heat exchanger 10 is installed on the downstream side of the heat exchanger 10, for example, although not shown.

  In the heat exchanger 10 having such a configuration, when the heat exchanger 10 is operated as an evaporator, when the outside air temperature is lower than a predetermined temperature in winter or the like (for example, 0 ° C. or less), as shown in the figure. The difference between the fin surface temperature and the outside air temperature is large, and the fin leading edge 1a side where the cooling performance (heat exchange performance) is high causes larger frost formation, and the heat transfer performance with the air is lowered, and gradually according to the growth. Narrow fin pitch to reduce air flow. 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 (heating performance) of the indoor unit side heat exchanger is lowered. In addition to the decrease in the heat exchange amount, the leaving of frost causes an abnormal decrease in evaporation pressure and a return of refrigerant liquid to the compressor, leading to a decrease in performance and failure of the refrigerator.

  Conventionally, the defrosting means for removing frost from such an outdoor heat exchanger 10 is roughly classified into, for example, a mechanical defrosting device that mechanically removes frost using a brush or the like (as disclosed in Patent Document 1, for example). And a defrost device (see Patent Document 2 as an example) that sends warm refrigerant (hot gas) from the compressor into the outdoor heat exchanger 10 to melt and remove frost. There is also a combined type defrosting device (see, for example, Patent Document 3) in which both of these defrosting means are used in combination.

  In the mechanical defrosting device using the brush of Patent Document 1, a brush in which hairs having the same length, the same rigidity, etc. are evenly implanted in the circumferential direction of the shaft body is used, and the brush is rotated and driven in the vertical direction. By doing so, the frost on the surface of the heat transfer fin is scraped off.

  Moreover, in the defrost apparatus using the hot gas of the said patent document 2, if heating operation is performed in the predetermined state, for example, if frost formation has arisen in the outdoor heat exchanger, it will be 4 directions of a freezing circuit. By switching the switching valve to a state in which the refrigerant flow is reversed from the previous one, hot discharge gas from the compressor is supplied to the outdoor heat exchanger that has functioned as an evaporator, thereby transferring heat. The frost on the fin surface is melted.

  Furthermore, in the melting method and the mechanical two-method combined apparatus of Patent Document 3, first, frost adhering to the heat transfer fin portion of the outdoor heat exchanger is removed by using a melting removal means by hot gas supply. After melting into the above state, by using a mechanical removal means such as a brush to smoothly remove frost, the total time required for the frost melting and removal operation using the basic hot gas is reduced. Yes.

  Therefore, the defrosting operation time itself is shortened as compared with the case of the defrosting method using only the melting and removing operation by hot gas supply as in Patent Document 2 above.

Japanese Utility Model Publication No. 6-59769 Japanese Patent Laid-Open No. 6-341741 JP-A-11-201593

  However, in the defrost system in which the refrigerant cycle of the refrigerant circuit as in Patent Document 2 is changed in the reverse direction, there is a disadvantage that the heating performance and the indoor comfort are lost during the defrosting operation time, and a certain time has passed. Then, since the frost is formed again, the defrosting operation is required periodically, and the heating performance and the indoor comfort are lost each time.

  Of course, in order to solve such a problem, for example, an outdoor heat exchanger that becomes an evaporator during heating is divided into a plurality of heat exchanger parts on the basis of a refrigerant diversion path, and from each compressor, A bypass circuit that bypasses the discharge gas and an electromagnetic on-off valve that controls opening and closing of the bypass state are provided, and defrost operation is alternately performed for each heat exchanger without reversing the refrigeration cycle itself during heating operation of the air conditioner. Although it has been proposed that non-stop heating operation can be realized by performing this, in this case as well, the heating performance decreases at least for the heat exchanger division, and the heat exchanger and The refrigerant piping becomes complicated and cannot be easily applied to various outdoor heat exchangers.

  Moreover, in the case of the above-mentioned Patent Document 3, the time for the defrosting operation by hot gas supply is certainly shortened, but when performing the defrosting operation, the defrosting operation is always used on the premise. Inevitably, the heat exchange efficiency of the use side heat exchanger is reduced. Accordingly, it is impossible to avoid a decrease in the heating function of the indoor unit side heat exchanger within a certain period of time. In addition to installing a mechanical defroster, it is necessary to further change the cycle direction of the refrigeration circuit, install a hot gas bypass circuit, and the like, and there is a problem of complicating the circuit configuration and the control function. Further, since the defrosting operation of the refrigeration circuit, the frost part waiting to be melted by the defrosting operation, the subsequent mechanical defrosting operation and the three-stage operation, and the waiting time are required, the defrost time is not necessarily short as a whole. Not necessarily.

  On the other hand, such a problem does not occur in principle in the mechanical defrosting device as in Patent Document 1 described above.

  However, if the frost and ice attached to the heat exchange fins are removed with the defrosting brush, the frost and ice will adhere firmly to the defrosting brush and the defrosting action by the defrosting brush itself will be inhibited. Problem arises.

  Therefore, the present invention uses a defrosting brush to mechanically frost (in the description of the claims and specification of the present application, the term “frost” Accordingly, in the heat exchanger for refrigeration equipment, the “frost” may also include “ice” generated by freezing. It is what we are going to propose.

  That is, the heat exchanger for a refrigeration apparatus according to the present invention includes a fin defrosting unit that mechanically removes frost attached to a heat exchange fin with a defrost brush, and a brush remover that removes frost attached to the defrost brush. The first feature is that it includes frosting means and / or brush frosting prevention means for preventing frost formation on the defrosting brush.

  In addition, as a second feature of the heat exchanger for a refrigeration apparatus of the present invention, it is recommended that the material surface of the defrost brush be subjected to a frost prevention treatment.

  Furthermore, in the heat exchanger for a refrigeration apparatus of the present invention, as a third feature thereof, it is recommended that the frost prevention treatment is a surface treatment of a defrosting brush with a water repellent or a lubricant.

  Further, as a fourth feature of the heat exchanger for a refrigeration apparatus of the present invention, it is recommended to provide a heating means for the constituent members of the defrosting brush.

  Furthermore, as a fifth feature of the heat exchanger for a refrigeration apparatus of the present invention, it is recommended to provide a vibration means for applying vibration to the defrosting brush.

  Further, as a sixth feature of the heat exchanger for a refrigeration apparatus of the present invention, after the defrosting action of the heat exchange fin surface by the defrosting brush is performed, the defrosting brush removes the frost removing member. It is recommended to pass.

  Furthermore, as a seventh feature of the heat exchanger for a refrigeration apparatus of the present invention, the defrosting brush is a rod-shaped rotating brush that rotates on the front surface of the frosting portion of the heat exchange fin, and the rotating brush Is recommended to rotate at high speed after the defrosting action on the heat exchange fin.

  Furthermore, the heat exchanger for a refrigeration apparatus according to the present invention is, as an eighth feature, provided with a rod-like or comb-like frost removing member that comes into contact with the bristle member of the rotating brush from the outer peripheral side. Recommended.

  Furthermore, as a ninth feature of the heat exchanger for a refrigeration apparatus according to the present invention, intermittent defrosting agent supply means for applying or distributing the defrosting agent to the defrosting brush at regular intervals is provided. It is recommended that

  The present invention includes a fin defrosting unit that mechanically removes frost attached to the heat exchange fin with a defrosting brush, a brush defrosting unit that removes frost attached to the defrosting brush, and / or the defrosting brush. In the heat exchanger for a refrigeration apparatus having a brush frost prevention means for preventing frost formation on the frost, the frost attached to the defrost brush or the frost on the defrost brush itself is removed by the first feature. There is an effect that can be prevented.

  The present invention also includes a fin defrosting unit that mechanically removes frost attached to the heat exchange fin with a defrosting brush, a brush defrosting unit that removes frost attached to the defrosting brush, and / or the defrosting. In the heat exchanger for a refrigeration apparatus provided with a brush frost prevention means for preventing frost formation on the brush, the frost formation itself on the material surface of the defrosting brush is made as much as possible if configured as in the second feature. There is an effect that can be prevented.

  The present invention also includes a fin defrosting unit that mechanically removes frost attached to the heat exchange fin with a defrosting brush, a brush defrosting unit that removes frost attached to the defrosting brush, and / or the defrosting. In the heat exchanger for a refrigeration apparatus provided with a brush frost prevention means for preventing frost formation on the brush, if configured as in the third feature, the effect of promoting detachment of the frost attached to the defrost brush is obtained. is there.

  The present invention also includes a fin defrosting unit that mechanically removes frost attached to the heat exchange fin with a defrosting brush, a brush defrosting unit that removes frost attached to the defrosting brush, and / or the defrosting. In the heat exchanger for a refrigeration apparatus provided with the brush frost prevention means for preventing the frost from forming on the brush, if configured as in the fourth feature, the effect of promoting the melting of the frost attached to the defrost brush is effective. is there.

  The present invention also includes a fin defrosting unit that mechanically removes frost attached to the heat exchange fin with a defrosting brush, a brush defrosting unit that removes frost attached to the defrosting brush, and / or the defrosting. In the heat exchanger for a refrigeration apparatus provided with a brush frost prevention means for preventing frost formation on the brush, if configured as in the fifth feature, the frost attached to the defrost brush can be shaken off by vibration. There is an effect that can be done.

  The present invention also includes a fin defrosting unit that mechanically removes frost attached to the heat exchange fin with a defrosting brush, a brush defrosting unit that removes frost attached to the defrosting brush, and / or the defrosting. In the heat exchanger for a refrigeration apparatus provided with a brush frost prevention means for preventing frost formation on the brush, if configured as in the sixth feature, after the defrosting action by the defrost brush on the heat exchange fin, There is an effect that the defrosting for the defrosting brush is reliably performed.

  The present invention also includes a fin defrosting unit that mechanically removes frost attached to the heat exchange fin with a defrosting brush, a brush defrosting unit that removes frost attached to the defrosting brush, and / or the defrosting. In the heat exchanger for a refrigeration apparatus provided with a brush frost prevention means for preventing frost formation on the brush, if configured as in the seventh feature, the rotating brush rotates at a high speed after the defrosting action on the heat exchange fin is completed. By doing so, there is an effect that frost adhering to the rotating brush can be easily separated by centrifugal force.

  The present invention also includes a fin defrosting unit that mechanically removes frost attached to the heat exchange fin with a defrosting brush, a brush defrosting unit that removes frost attached to the defrosting brush, and / or the defrosting. In the heat exchanger for a refrigeration apparatus provided with a brush frost prevention means for preventing frost formation on the brush, if configured as in the above eighth feature, the brush bristle member in the rotating brush contacts from the outer peripheral side. The rod-like or comb-like frost removing member has an effect of forcibly scraping off the frost.

  The present invention also includes a fin defrosting unit that mechanically removes frost attached to the heat exchange fin with a defrosting brush, a brush defrosting unit that removes frost attached to the defrosting brush, and / or the defrosting. In the heat exchanger for a refrigeration apparatus provided with a brush frost prevention means for preventing frost formation on the brush, if configured as in the ninth feature, the frost attached to the defrost brush is surely removed at regular intervals. There is an effect.

  In carrying out the present invention, in addition to the first feature, all of the second to ninth features may be combined, or any of the second to ninth features may be combined. One to eight features may be arbitrarily combined.

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

  First, FIG. 3 shows a configuration of a heat exchanger for a refrigeration apparatus used in the embodiment of the present invention.

  By the way, the defrost brush attached to the heat exchanger for refrigeration apparatuses of this invention is divided roughly, and a defrost brush is parallel to an up-down direction (arrow AB) along the front surface (airflow upstream) of a heat exchanger. A driven translational brush type (illustrated in FIG. 1) and a rotating brush type in which the defrost brush is driven in the vertical direction (arrows AB) while rotating on the front surface of the heat exchanger (arrow R) ( 2), the embodiment shown in FIGS. 4 to 6 is of a translational brush type, and the embodiment shown in FIG. 7 is of a rotating brush type.

  1 and the rotary type defrosting brush 5 illustrated in FIG. 2 are frost in the back direction between the fin gaps of the heat exchange fins 1, 1. Long brush bristles 5b designed to reach (relatively sparse density) and short bristles 5a (dense) for scraping off relatively dense frost at the entrance between the fin gaps. In other embodiments, the brush hairs in these brushes 5 and 5 may all have the same length.

  Subsequently, common to the heat exchangers for the refrigeration apparatus of the embodiment using the translation brush type defrost brush (FIGS. 4 to 6) and the embodiment using the rotating brush type defrost brush (FIG. 7). , The outdoor heat exchanger for a refrigeration apparatus indicated by reference numeral 10 has a general shape as shown in FIG. 3, where reference numerals 1, 1,... Denote a number of plate fins. (Heat exchange fins), 2a, 2b, 2a, 2b... Are the heat transfer tubes on the front row side and the rear row side, and the multiple plate fins 1, 1. Are installed in a cross state on the two front and rear rows of the heat transfer tubes 2a, 2b, 2a, 2b... Tube plates 10a, 10 on the left and right sides with a sufficient predetermined fin pitch And it is fixed by arranged in between.

  Further, on the downstream side of the outdoor heat exchanger 10, for example, on the downstream side of the air flow, a blower such as a propeller fan that sucks air from the outside in the direction of the arrow is installed through the outdoor heat exchanger 10. .

  In the outdoor heat exchanger 10 having such a configuration, when the heat exchanger 10 is operated as an evaporator, when the outside air temperature is lower than a predetermined temperature in winter or the like (for example, 0 ° C. or less), the above-described FIG. As shown, the difference between the fin surface temperature and the outside air temperature is large, and the fin leading edge 1a side having a higher cooling performance (heat exchange performance) produces larger frost formation, and the heat transfer performance is reduced. The fin pitch is gradually narrowed to reduce the ventilation rate.

  As a result, the heat exchange efficiency is lowered, and the condensation efficiency (heating performance) of the indoor unit side heat exchanger is lowered.

  Therefore, in order to solve such a problem, the plate fins 1, 1... And the heat transfer tubes are provided on the air inlet surface side of the outdoor heat exchanger 10 as shown in FIGS. Defrosting provided with hairs 5a, 5a ..., 5b, 5b ... that have sufficient rigidity to scrape off the frosts F, F ... that have formed on the 2a, 2a ... parts. A brush (translational brush or rotating brush) 5 is installed so as to be arbitrarily lifted and lowered in both the upper and lower directions across the left and right ends of the heat exchanger 10.

  Subsequently, referring to FIGS. 4 to 6, the heat exchanger for the refrigeration apparatus of the embodiment using the translation brush type defrosting brush will be described. The heat exchanger for the refrigeration apparatus of the embodiment shown in FIG. A defrosting brush 5 that is driven in the vertical direction (in the directions of arrows A and B) by an endless belt 17 along the front surface (upstream side of the air flow) of the heat exchanger 10 is provided. The belt 17 is wound around the upper and lower pulleys 16a and 16b, and is driven in the direction of the arrow A or B according to the forward and reverse rotation of the motor 3M, during which the defrosting brush 5 is connected to the heat exchange fins 1, 1,.・ The frost attached to it is scraped off.

  By the way, when the refrigeration apparatus is operated for a certain period of time and the defrosting action by the defrosting brush 5 is performed on the outdoor heat exchanger 10, the frost is stuck to the brush bristles 5 a and 5 b of the defrosting brush 5. Therefore, the defrosting action on the heat exchange fins 1, 1,.

  In the embodiment shown in FIGS. 4 to 6, in order to cope with such a defrosting phenomenon with respect to the defrosting brush 5, various frosting prevention materials are applied to the material of the brush hairs 5 a and 5 b of the defrosting brush 5. Surface treatment (for example, application of a silicon-based or fluorine-based water repellent) is performed.

  Such a water repellent agent suppresses frost formation itself on the brush bristles 5a and 5b of the defrosting brush 5, and is described below from the defrosting brush 5 in the forced defrosting process for the defrosting brush 5. There is an action to promote the frost peeling action.

  In the embodiment shown in FIG. 4, a defrosting agent is distributed below the heat exchanger 10 to distribute a defrosting solution (for example, warm water or calcium carboxylate solution) to the bristles 5 a and 5 b of the defrosting brush 5. The defrosting liquid is applied to the brush bristles 5a and 5b of the defrosting brush (5 ') which is provided with the device 30 and the comb-shaped brush defrosting removing member 40 and descends to the lower side of the heat exchanger 10. The frost adhering to the brush bristles 5a and 5b is softened and the frost is forcibly scraped off by the brush frost removal member 40. In another embodiment, a defrosting brush heating device that heats the brush bristles 5a and 5b of the defrosting brush 5 'may be provided instead of the defrosting agent distribution device 30 or together with the defrosting agent distribution device 30. Alternatively, instead of the comb-like brush frost removal member 40, a rotary brush-like brush frost removal member 40 illustrated in FIG. 5 can be used.

  As the defrosting brush heating device, for example, an electric heater may be provided at the moving end (upper end or lower end) of the defrosting brush 5, or a hot gas heater that heats the defrosting brush 5 with hot gas of a refrigeration device may be provided. it can. 5, the embodiment shown in FIG. 4 is the same as the embodiment shown in FIG. 4 except that the comb-like brush frost removal member 40 shown in FIG. 4 is changed to a rotary brush-like brush frost removal member 40. Since this is the same as above, description of other parts will be omitted.

  The additional feature of the embodiment shown in FIG. 5 will be described. When the rotation of the rotary brush type brush frost removal member 40 is controlled to be repeated alternately at high speed and low speed, the brush bristles of the defrost brush 5 'are controlled. Mechanical vibration is applied (the rotating brush type brush defrosting removal member 40 acts as a vibration device for the defrosting brush 5 according to claim 5), and the defrosting action on the defrosting brush 5 is further promoted. .

  The heat exchanger for the refrigeration apparatus of the embodiment shown in FIG. 6 is provided with a container 50 filled with a frost melting liquid (warm water or appropriate chemical liquid) L below the lower pulley 16a that drives the belt 17. The defrosting brush 5 'to which frost is attached is immersed in the frost melt L to remove frost from the brush bristles 5a and 5b. In the case of this embodiment, the bristle planting bed 5c in the defrosting brush 5 is constructed by using a bendable material or by connecting a strip-shaped plate material into a foldable slat-like shape. It is preferable to bend freely when passing under the pulley 16a.

  Next, an embodiment of the heat exchanger for a refrigeration apparatus using a rotating brush type defrosting brush will be described with reference to FIG. 7. FIG. 7 shows the front surface (the air flow upstream side) of the outdoor heat exchanger 10. A configuration is shown in which the defrosting brush 5 is driven in the vertical direction while rotating to scrape off the frost adhering to the heat exchange fins 1.

  An example of the drive mechanism of the rotating brush 5 will be described. A pair of left and right screw shafts 8 and 8 extending in the vertical direction and functioning as worm gears are vertically mounted on both ends of the rotating shaft 4 (FIG. 2) of the rotating brush 5. The rotary shaft 4 of the rotary brush 5 is provided via a pair of shaft support portions 11a, 11a, 11b, and 11b. 8 and 8 are attached so as to be movable up and down in a loosely fitting state.

  That is, the engagement brackets 9 and 9 on both ends of the rotary shaft 4 are provided with shaft fitting insertion holes 9a and 9a having thread recesses that engage with the thread portions of the screw shafts 8 and 8 on the inner peripheral surfaces, respectively. And is moved up and down in either the upper or lower direction according to the rotational direction of the screw shafts 8, 8, and is configured as a bearing portion of the rotary shaft 4. The shaft ends of the rotary shaft 4 are rotatably supported with respect to the bearing holes of the engagement brackets 9 and 9.

Further, either one end of the rotary shaft 4, the brushes are connected to and supported through a reduction gear box 6 to a rotary drive shaft section of the drive motor M _1, the rotary shaft 4 is the brush driving motor M _{According to 1} , rotation is driven in a desired rotation direction at a desired rotation speed. Then, the other end of the brush drive motor M _1, has been with the engagement bracket 9 which is fitted out screwed to the screw shaft 8 takes, through the engagement bracket 9, lifting the screw shaft 8 It is designed to be driven.

On the other hand, the screw shafts 8 and 8 on the one end side and the other end side are provided with rotating gear pulleys 12b and 12b on the lower ends 8a and 8a, respectively. A chain 14b is stretched over and rotates in conjunction with each other by driving on either side. Then, the lower end 8a of the one-side screw shaft 8 of which are further driven gear 12a is fixed, the driven gear 12a, the output of the screw shaft drive motor M ₂ via a toothed belt or chain 14a The screw shaft drive gear 13 fixed to the shaft 15 is linked.

Therefore, when the screw shaft driving motor M ₂ is rotationally driven, the pair of left and right screw shafts 8 and 8 are rotated in a desired direction, and accordingly the rotating brush 5 is moved from the lower side to the upper side. It is arbitrarily raised and lowered from the upper side to the lower side.

On the other hand, when the rising time or falling, the rotating brush 5 is rotated as shown by an arrow by the brush driving motor M ₁ described above, the heat transfer fins 1 of the outdoor heat exchanger 10 described above while rotating at the desired speed , 1... Scrape off the frosts F, F... Generated from the front edge side of the surface toward the rear edge.

  In the case of the embodiment of FIG. 7, as in the case of the embodiment shown in FIGS. 4 to 6, when the defrosting brush 5 is lowered, various defrosting agents are sprayed on the defrosting brush 5 ′. A defrosting agent distributing device 30 for removing the frost and a comb-like brush defrosting removing member 40 for removing frost attached to the defrosting brush 5 'are provided. When the defrosting brush 5 'is lowered, the brush defrosting removal member 40 shown in FIG. 7 is pushed out in the direction of arrow C by the solenoid 41 in order to scrape frost from the defrosting brush 5', and the defrosting brush 5 'is raised. When driven, the solenoid 41 is moved backward in the direction of arrow D so as not to contact the defrosting brush 5 '.

  In the embodiment as shown in FIG. 7 using the rotating brush type defrosting brush 5, the defrosting brush 5 is rotated at a high speed at the position where the defrosting brush 5 is moved below the heat exchanger 10, and the centrifugal force Thus, the frost adhering to the brush bristles 5a and 5b can be shaken off. In this case, it is needless to say that various brush defrosting promotion means and / or brush defrosting prevention means as described in claims 2 to 6, 8 and 9 of the claims can be used in combination.

1 is an external view of a translation brush type defrosting brush used in an embodiment of the present invention. It is an external view of the rotating brush type defrosting brush used in the Example of this invention. It is an external view of the outdoor heat exchanger used in the Example of this invention. It is a conceptual diagram of the brush defrost prevention means with respect to the defrost brush in the Example of this invention, and / or a brush defrost means. It is a conceptual diagram of the brush defrost prevention means and / or brush defrosting means with respect to the defrosting brush in the other Example of this invention. It is a conceptual diagram of the brush defrost prevention means and / or brush defrosting means with respect to the defrosting brush in the other Example of this invention. It is a conceptual diagram of the brush defrost prevention means and / or brush defrosting means with respect to the defrosting brush in the other Example of this invention. It is frosting state explanatory drawing with respect to an outdoor heat exchanger. It is a side view of the outdoor heat exchanger shown in FIG.

Explanation of symbols

  1 is a heat exchange fin, 2a and 2b are heat transfer tubes, 5 is a defrosting brush, 10 is an outdoor heat exchanger, 17 is an endless belt, 21 is a motor, 30 is a defrosting agent distribution device, and 40 is a brush defrosting device. It is a member.

Claims (9)

  Fin defrosting means for mechanically removing frost adhering to the heat exchange fin with a defrosting brush, brush defrosting means for removing frost adhering to the defrosting brush, and / or frosting on the defrosting brush A heat exchanger for a refrigeration apparatus, comprising brush frost prevention means for preventing the refrigeration apparatus.   The heat exchanger for a refrigeration apparatus according to claim 1, wherein the material surface of the defrosting brush is subjected to frosting prevention treatment.   The heat exchanger for a refrigeration apparatus according to claim 2, wherein the anti-frosting treatment is a surface treatment of a defrosting brush with a water repellent or a water-sliding agent.   The heat exchanger for a refrigeration apparatus according to claim 1, 2 or 3, further comprising heating means for the constituent members of the defrosting brush.   The heat exchanger for a refrigeration apparatus according to any one of claims 1 to 4, further comprising an oscillating means for applying vibration to the defrosting brush.   The defrosting brush passes through the defrosting member after the defrosting action of the heat exchange fin surface by the defrosting brush is performed. The heat exchanger for refrigeration equipment described in 1.   The defrosting brush is a rod-shaped rotating brush that rotates on the front surface of the frosting portion of the heat exchange fin, and the rotating brush rotates at a high speed after the defrosting action on the heat exchange fin is completed. The heat exchanger for a refrigeration apparatus according to any one of claims 1 to 6, wherein the heat exchanger is a refrigerating apparatus.   The refrigeration apparatus heat according to any one of claims 1 to 7, wherein a rod-like or comb-like frost removing member that comes into contact with a brush bristle member of the rotating brush from the outer peripheral side is provided. Exchanger.   The freezing according to any one of claims 1 to 8, wherein intermittent defrosting agent supply means for applying or distributing a defrosting agent to the defrosting brush at regular intervals is provided. Heat exchanger for equipment.

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