JP2009236364A - Defrosting device for heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain high defrosting effects by reflecting a difference of properties of frost based on environmental conditions during generation of the frost to operation control of a brush, in a defrosting device using the brush. <P>SOLUTION: In the defrosting device for a heat exchanger having a brush defrosting means, its operating form is changed corresponding to the environmental conditions during frost generation, that is, corresponding to any of ambient temperature, ambient humidity and fin surface temperature during frost generation. Due to this configuration, frost of which fixing force to a fin surface is different depending on the environmental conditions during generation can be effectively removed by operating the brush defrosting means in the suitable operating form corresponding to the fixing force. Thus, high defrosting effects can be obtained. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a defroster for a heat exchanger using a brush.

  Especially in cold district specification air conditioners, there is a problem of increased airflow resistance due to frost formation on the fin surface of the outdoor heat exchanger during heating operation or reduced heating capacity due to decreased heat transfer efficiency of the fins. . For this reason, it is necessary to remove frost formation on the fin surface of the outdoor heat exchanger, and as a defrosting method for that purpose, the high-temperature refrigerant discharged from the compressor is temporarily switched to the cooling operation during the heating operation. Conventionally, a defrosting operation by a so-called reverse cycle in which the frost on the fin surface is melted and removed by circulation to an outdoor heat exchanger has been common. However, when performing the defrosting operation by the reverse cycle, the heating operation is stopped during the defrosting operation, so that there is a problem that the comfort of heating in the room is impaired.

  As a technique to solve such a problem, a technique is proposed in which frost formation on the fin surface of the heat exchanger is mechanically defrosted from the outside without using refrigerant heat, thereby maintaining the comfort of heating. (See Patent Document 1).

  The defrosting device shown in this Patent Document 1 is a defrosting device using a rotating brush, which moves the rotating brush in the vertical direction along the ventilation surface of the heat exchanger while rotating the rotating brush, and between the fins. The brush bristles of the inserted rotating brush are configured to scrape and remove frost formation on the fin surface.

Japanese Utility Model Publication No. 6-59769

  By the way, the nature of frost adhering to the fin surface of the heat exchanger is not constant, affected by environmental conditions at the time of frost generation, such as the ambient temperature or humidity of the fin, the surface temperature of the fin, the evaporation temperature, Different properties. For example, when the outside air temperature is below the freezing point, the water adhering to the fin surface gradually freezes to become large ice, and frost is generated on this ice. Increases adhesion to the surface. On the other hand, when the outside air temperature is below freezing point, the water adhering to the fin surface freezes in a short time to become small ice, and frost is generated on this ice. The frost in is weak in adhesion to the fin surface.

  However, in the conventional defrosting device, the defrosting is performed by the uniform scraping operation of the brush without considering the difference in frost properties based on the environmental conditions at the time of frost generation. It may be difficult to obtain a defrosting effect, and there is room for improvement in this regard.

  Therefore, the present invention aims at obtaining a high defrosting effect in the defrosting apparatus using a brush by reflecting the difference in frost properties based on the environmental conditions at the time of frost generation in the operation control of the brush. It was made.

  In the present invention, the following configuration is adopted as a specific means for solving such a problem.

  In the first invention of the present application, in the defroster of the heat source side heat exchanger in the refrigeration apparatus, the defroster includes brush defrosting means for scraping and removing frost attached to the fin surface with a brush. It is characterized by changing the operation mode corresponding to the environmental conditions at the time of frost generation.

  In 2nd invention of this application, in the defroster of the heat exchanger which concerns on the said 1st invention, the said brush defrosting means adhered to the fin surface by moving, maintaining the relative position with the said fin. It is characterized by comprising a fixed brush for scraping frost, or a rotating brush for scraping frost attached to the fin surface by moving while rotating.

  In 3rd invention of this application, in the defroster of the heat exchanger which concerns on the said 1st or 2nd invention, ambient temperature at the time of the production | generation of frost, ambient humidity, fin surface temperature, evaporation temperature as said environmental conditions One of the features is adopted.

  According to a fourth invention of the present application, in the defroster for a heat exchanger according to the third invention, the brush defrosting means includes the fixed brush, and the fin ambient temperature is equal to or lower than a predetermined temperature near the freezing point. In some cases, when the moving speed of the brush is set low, or / and the brush operating frequency is set low, or / and the brush angle is set low, while the fin ambient temperature is equal to or higher than a predetermined temperature near the freezing point. Is characterized in that the moving speed of the brush is increased and / or the operating frequency of the brush is increased or / and the rake angle of the brush is set large.

  In a fifth invention of the present application, in the defroster for a heat exchanger according to the third invention, the brush defrosting means includes the rotating brush, and the fin ambient temperature is not more than a predetermined temperature near the freezing point. In some cases, the rotational speed of the brush is set low, / and the brush moving speed is set high, or / and the brush operating frequency is set low, while the fin ambient temperature is equal to or higher than a predetermined temperature near the freezing point. Is characterized in that the rotational speed of the brush is set high and / or the moving speed of the brush is set low and / or the operation frequency of the brush is set high.

  In the present invention, the following effects can be obtained.

  (A) According to the defroster for a heat exchanger according to the first invention of the present application, the defroster includes brush defrosting means for scraping and removing frost attached to the fin surface with a brush. Since the operation mode is changed in accordance with the environmental conditions at the time of frost generation, a suitable operation mode corresponding to the fixing force for the frost whose adhesion force to the fin surface varies depending on the environmental conditions at the time of generation. Thus, the brush defrosting means can be operated to effectively remove it, and a high defrosting effect can be obtained.

  (B) According to the defroster for a heat exchanger according to the second invention of the present application, in addition to the effect described in the above (a), the following specific effects can be obtained. That is, according to the present invention, the brush defrosting means moves on the fin surface by scraping the frost attached to the fin surface by moving while maintaining the relative position with the fin, or by moving while rotating. Since the rotating brush that scrapes off the attached frost is provided, frosting on the fin surface can be mechanically removed in any of these defrosting means, and the reliability of defrosting is ensured.

  (C) According to the defroster for a heat exchanger according to the third invention of the present application, in addition to the effects described in (a) or (b) above, the following specific effects can be obtained. That is, in the present invention, at least one of the ambient temperature, ambient humidity, and fin surface temperature at the time of frost generation is adopted as the environmental condition. Here, the ambient temperature, ambient humidity, and fin surface temperature of the fin are all factors that govern the adhesion of frost to the fin surface, and the evaporation temperature is a factor that directly affects the fin surface temperature. By changing the operation mode of the brush defrosting means to an optimal mode based on any of these, effective defrosting corresponding to the nature of frost formation is realized, and the defrosting effect is further enhanced.

  (D) According to the defroster for a heat exchanger according to the fourth invention of the present application, the following specific effects can be obtained in addition to the effects described in (c) above. That is, according to the present invention, the brush defrosting means includes the fixed brush, and when the fin ambient temperature is equal to or lower than a predetermined temperature near the freezing point, the moving speed of the brush is reduced or / and the brush is moved. If the operating frequency is set low or / and the brush angle is set small, while the fin ambient temperature is equal to or higher than the predetermined temperature near the freezing point, the brush moving speed is increased or / and the brush operating frequency is set to be low. The angle of the brush is set to be high or / and large.

  Here, when the fin ambient temperature is equal to or lower than the predetermined temperature near the freezing point, the frost is firmly attached to the fin surface, and when the fin ambient temperature is equal to or higher than the predetermined temperature near the freezing point, the frost against the fin surface is observed. The fixing force is weak.

  In the case of the configuration provided with the fixed brush, the moving speed of the brush corresponds to the impact force to the frosting by the brush, and the higher the moving speed, the higher the impact force. Further, the operation frequency of the brush corresponds to the accumulation of impact force applied to frost formation, and the higher this is, the greater the accumulated impact force. Furthermore, the scooping angle of the brush is involved in the outward discharge from the fins of frost scraped off by the brush, and the larger this is, the higher the frost discharge is.

  Therefore, in the brush defrosting means having a configuration including a fixed brush, when the fin ambient temperature is equal to or lower than a predetermined temperature near the freezing point, the fixing force of the frost on the fin surface is weak, so the moving speed of the brush is reduced. Even if it is set, the brush operating frequency is set low, and the scoop angle of the brush is set small, a high defrosting effect can be obtained. On the other hand, when the ambient temperature of the fin is equal to or higher than the predetermined temperature near the freezing point, the frosting is strongly fixed to the fin surface, but the brush moving speed is set high, the brush operating frequency is set high, A high defrosting effect can be obtained by setting the scooping angle large.

  (E) According to the defroster for a heat exchanger according to the fifth invention of the present application, in addition to the effect described in (c) above, the following specific effect is obtained. That is, in the present invention, the brush defrosting means includes the rotating brush, and when the fin ambient temperature is equal to or lower than a predetermined temperature near the freezing point, the rotation speed of the brush is reduced or / and the brush When the moving speed is set high and / or the brush operating frequency is set low, and the fin ambient temperature is equal to or higher than the predetermined temperature near the freezing point, the brush rotating speed is increased, and / or the brush moving speed is increased. The operation frequency of the brush is set to be low or / and high.

  Here, when the fin ambient temperature is equal to or lower than the predetermined temperature near the freezing point, the frost is firmly attached to the fin surface, and when the fin ambient temperature is equal to or higher than the predetermined temperature near the freezing point, the frost against the fin surface is observed. The fixing force is weak.

  In the case of the configuration provided with the rotating brush, the rotating speed corresponds to the impact force to the frost formation by the brush, and the higher the rotating speed, the higher the impact force. Moreover, the moving speed of a brush respond | corresponds to the frequency | count of addition of the impact force to the frosting by a brush, and the frequency | count of impact force addition increases so that a movement speed is low. Furthermore, the operation frequency of the brush corresponds to the accumulation of impact force applied to frost formation, and the higher this is, the greater the cumulative impact force.

  Therefore, in the brush defrosting means having the configuration including the rotating brush, when the fin ambient temperature is equal to or lower than the predetermined temperature near the freezing point, the fixing force to the fin surface of the frost is weak, so the rotation speed of the brush is set low. Even if the brush moving speed is set high and the brush operating frequency is set low, a high defrosting effect can be obtained. On the other hand, when the fin ambient temperature is equal to or higher than the predetermined temperature near the freezing point, frosting is strongly fixed to the fin surface, but the brush rotation speed is high, the brush moving speed is low, and the brush operating frequency is high. A high defrosting effect can be acquired by setting.

Hereinafter, the present invention will be specifically described based on preferred embodiments.
I: First Embodiment FIG. 1 shows a defrosting device Z1 according to a first embodiment of the present invention. This defrosting device Z1 is a cross fin type heat formed by arranging a plurality of fins 2 that are sequentially opposed to each other at a predetermined interval and a plurality of heat transfer tubes 3 arranged in parallel in a state of passing through the fins 2. A brush defrosting means 4 for mechanically removing frost adhering to the surface of each fin 2 of the exchanger 1 is provided. In particular, the brush defrosting means 4 is provided with a fixed brush 34. It is configured.

  1-3, the brush defrosting means 4 wipes the surface of the fin 2 of the heat exchanger 1 and scrapes and removes the frost adhering to the fixed brush 34 and the fixed brush. 34 is provided with a driving means 50 that drives the heat exchanger 1 to move up and down along the ventilation surface 1a.

  The fixed brush 34 is configured by implanting a large number of brush hairs 37 on one surface of a rod-like support 35 having a length dimension substantially equal to the width of the heat exchanger 1. In addition, rotation shafts 36 are provided at both ends of the support 35. In addition, the kind, shape, etc. of the said bristle 37 are suitably selected according to the property etc. of the frost made into removal object.

  As shown in FIG. 1, the driving means 50 includes slide guides 51, 52 erected on both sides in the width direction of the heat exchanger 1. Of these slide guides 51 and 52, one slide guide 51 includes, for example, a ball screw type slide actuator (not shown). This slide actuator is driven by a reversible rotary motor 53 disposed at the upper end of the slide guide 51 so that the slider 55 can be moved up and down. A bearing 57 is attached to the slider 55. On the other hand, a slider 56 having a bearing 57 is attached to the other slide guide 52.

  The fixed brush 34 is rotatably supported at one rotating shaft 36 by a bearing 57 on the slide guide 51 side and the other rotating shaft 36 by a bearing 57 on the slide guide 52 side, and the slide brush It is rotated by a stepping motor 58 disposed on the guide 51 side (see FIG. 2). By this rotation, the angle (α, β) of the fixed brush 34 with respect to the heat exchanger 1 can be changed.

  In addition, the relative space | interval of this heat exchanger 1 and the said fixed brush 34 in the ventilation direction of the said heat exchanger 1 is a fixed brush arrange | positioned at the front edge 2a side of the said fin 2, as shown in FIG.2 and FIG.3. The tip of the 34 bristle 37 is set to a size that can reach the vicinity of the axial center of the heat transfer tube 3 of the heat exchanger 1.

  With the above configuration, the fixed brush 34 wipes and removes frost attached to the surface 2a of the fin 2 of the heat exchanger 1 while moving on and off by the motor 53, and the stepping motor corresponds to the moving direction. 58 is used to change and set the angle for the heat exchanger 1.

  In this case, the relationship between the rotation direction of the fixed brush 34 and the traveling direction is set as follows. That is, in the brush defrosting means 4, the fixed brush 34 is moved down and moved up, and the fixed brush 34 scrapes and removes frost formation on the fin surface 2 c of the heat exchanger 1. In any of these cases, the required rake angle can be secured. Specifically, as shown in the middle part of FIG. 2, when the fixed brush 34 moves downward (in the direction of arrow D), the neutral state (the state indicated by the solid line in the lower part of FIG. 2) moves in the direction of arrow m. When the fixed brush 34 is moved upward (in the direction of the arrow U) by rotating it to secure a craving angle (α), it is rotated from the neutral state in the direction of arrow n so as to secure the craving angle (β). It has become.

  In addition, the sizes of these scooping angles (α) and (β) are set to increase or decrease according to the environmental conditions during frost formation, as will be described later.

  Here, the defrosting effect | action using the said fixed brush 34 is demonstrated with reference to FIG.2 and FIG.3.

  As shown in FIG. 2, when the fixed brush 34 moves down, the bristle 37 of the fixed brush 34 moves down while entering between the fins, and sequentially scrapes the attached frost Fa adhering to the fin surface 2 c. . In this case, the fixed brush 34 is scraped off in a state having a scooping angle (α) as shown in the middle part of FIG. 2, so that the fixed brush 34 is sequentially scraped from the adhering frost Fa on the fin surface. The frost is subjected to a discharge action forward and downward (see arrow P). Therefore, the amount of residual frost Fb remaining between the adjacent heat transfer tubes 3 is reduced, and the defrosting efficiency is increased accordingly.

  On the other hand, when the fixed brush 34 moves up, the bristle 37 of the fixed brush 34 moves up while entering between the fins, and sequentially scrapes the attached frost Fa adhering to the fin surface 2c. In this case, the fixed brush 34 is scraped off in a state having a scooping angle (β) as described in the upper part of FIG. 2, so that the fixed brush 34 is sequentially scraped from the adhering frost Fa on the fin surface. The frost is subjected to the discharging action forward in the traveling direction (see arrow Q). Therefore, the amount of residual frost Fb remaining between the adjacent heat transfer tubes 3 is reduced, and the defrosting efficiency is increased accordingly.

  And the magnitude | size of the said scooping angle is changed according to the ambient temperature of the fin 2, for example. That is, as described above, when the ambient temperature of the fin is lower than the predetermined temperature near the freezing point, the frost adheres strongly to the fin surface, and when the ambient temperature of the fin is higher than the predetermined temperature near the freezing point, The adhesion force of the frost to the fin surface is weak. Therefore, when the fin ambient temperature is equal to or lower than the predetermined temperature near the freezing point, the above landing angle is set to a smaller value than when the fin ambient temperature is equal to or higher than the predetermined temperature near the freezing point. The frost can be removed, and as a result, a high defrosting effect can be obtained while suppressing the driving input of the fixed brush 34.

  The ambient temperature of the above-described fin 2 affects the property of frost formation (mainly the adhesion force to the fin surface 2c). Similarly, the ambient humidity of the fin 2 determines the property of frost formation. There is a fin surface temperature, and accordingly, the above-mentioned crawl angle can be changed based on the ambient humidity of the fin 2 or the fin surface temperature. The ambient temperature, ambient humidity, or fin surface temperature of the fins 2 is also used for setting the moving speed and operating frequency of the fixed brush 34 as described below.

  In other words, the change in the crawl angle is one of the changes in the operation mode of the fixed brush 34. In addition, the operation mode of the fixed brush 34 includes the moving speed and the operation frequency of the fixed brush 34. The defrosting efficiency depends on whether the moving speed and operation frequency of the fixed brush 34 are set appropriately.

  Here, when the fin ambient temperature is equal to or lower than the predetermined temperature near the freezing point, the frost is firmly attached to the fin surface, and when the fin ambient temperature is equal to or higher than the predetermined temperature near the freezing point, the frost against the fin surface is observed. As described above, the fixing force is weak.

  When the fixed brush 34 is moved up and down to defrost the fin surface 2c, the moving speed of the fixed brush 34 corresponds to the impact force of the fixed brush 34 on frost formation, and this moving speed. The higher the is, the higher the impact force applied to frost formation.

  The operation frequency of the fixed brush 34 corresponds to the accumulation of impact force applied to frost formation, and the higher this is, the greater the cumulative impact force applied to frost formation.

  Therefore, in the brush defrosting means 4 provided with the fixed brush 34, for example, when the fin ambient temperature is equal to or lower than a predetermined temperature near the freezing point, the fixing force of the frost to the fin surface 2c is weak. Even if the moving speed of the fixed brush 34 is set low or the operation frequency of the fixed brush 34 is set low, a high defrosting effect can be obtained.

  On the other hand, when the fin ambient temperature is equal to or higher than a predetermined temperature near the freezing point, the frosting is strongly fixed to the fin surface 2c, but the moving speed of the fixed brush 34 is set high or the operation of the fixed brush 34 is performed. By setting the frequency high, a high defrosting effect can be obtained.

  By obtaining such a high defrosting effect, the heat transfer efficiency in the fins 2 is restored, and the ventilation resistance between the fins is reduced. Due to these synergistic effects, the heat exchanger 1 has a high heat exchange. It will be.

In addition, the change of the scooping angle, the moving speed of the fixed brush 34, and the operation frequency of the fixed brush 34 are arbitrary depending on the conditions on the frosting side, such as adopting any of these alone or combining them. Can be selected.
II: Second Embodiment FIG. 4 shows a defrosting device Z2 according to a second embodiment of the present invention. This defrosting device Z2 is a cross fin type heat formed by arranging a plurality of fins 2 arranged sequentially facing each other at a predetermined interval and a plurality of heat transfer tubes 3 arranged in parallel in a state of passing through the fins 2. A brush defrosting means 4 for mechanically removing frost adhering to the surface of each fin 2 of the exchanger 1 is provided, and in particular, this brush defrosting means 4 is provided with a rotating brush 41. It is configured.

  As shown in FIGS. 4 to 7, the brush defrosting unit 4 wipes the surface of the fin 2 of the heat exchanger 1 and scrapes and removes frost attached thereto, and the rotation brush 41. A drive means 50 for moving the brush 41 up and down is provided.

  The rotating brush 41 is constructed by implanting a large number of brush hairs 43 around the rotating shaft 42, and the type, shape, etc. of the brush hairs 43 are the properties of the frost to be removed. It is selected as appropriate.

  As shown in FIG. 4, the driving means 50 includes slide guides 51 and 52 that are erected on both sides in the width direction of the heat exchanger 1. Of these slide guides 51 and 52, one slide guide 51 includes, for example, a ball screw type slide actuator (not shown). This slide actuator is driven by a reversible rotary motor 53 disposed at the upper end of the slide guide 51 so that the slider 55 can be moved up and down. A bearing 57 is attached to the slider 55. On the other hand, a slider 56 having a bearing 57 is attached to the other slide guide 52.

  The rotating brush 41 is rotatably supported on one end side of the rotating shaft 42 by a bearing 57 on the slide guide 51 side and on the other end side by a bearing 57 on the slide guide 52 side, and on the slide guide 51 side. Is driven to rotate by a reversible rotary motor 54 disposed in

  In addition, the relative space | interval of this heat exchanger 1 and the said rotating brush 41 in the ventilation direction of the said heat exchanger 1 is the rotating brush arrange | positioned at the front edge 2a side of the said fin 2, as shown in FIGS. The tip of the 41 bristles 43 is set to a size that can reach the vicinity of the axis of the heat transfer tube 3 of the heat exchanger 1.

  With the above configuration, the rotary brush 41 is driven to rotate by the motor 54 and scrapes and removes frost attached to the surface 2a of the fin 2 of the heat exchanger 1 while moving on and off by the motor 53.

  In this case, the relationship between the rotation direction of the rotary brush 41 and the traveling direction is set as follows. That is, in the present invention, the rotary brush 41 moves down along the heat exchanger 1 as shown in FIG. 5 with the intention of scraping the frost scraped off by the rotary brush 41 out of the fins. In addition, as shown in FIG. 6, when the rotary brush 41 moves up along the heat exchanger 1, the rotary brush 41 is moved from the rear side to the front side in the traveling direction on the heat exchanger 1 side. The rotation direction is set so as to rotate toward. Therefore, the rotation direction of the rotating brush 41 is opposite between the upward movement and the downward movement.

  Here, the defrosting action by the rotating brush 41 will be described with reference to FIGS.

  As shown in FIG. 5, when the rotary brush 41 moves downward (in the direction of arrow D), the brush hair 43 of the rotary brush 41 rotates while entering between the fins, and the attached frost Fa attached to the fin surface 2c. In this case, as shown by an arrow R, the rotating brush 41 rotates from the rear side to the front side in the traveling direction (that is, the lowering direction) on the heat exchanger 1 side. From the exit side from the fin 2 of the rotating brush 41, the frost that is sequentially scraped off from the adhering frost Fa on the surface of the fin by the rotating brush 41 is scraped in the direction indicated by the arrow V1, The fins 2 are smoothly discharged outward.

  As shown in FIG. 6, also when the rotary brush 41 moves upward (in the direction of arrow U), as shown by arrow L, the rotary brush 41 moves in the traveling direction (that is, in the upward direction). The frost is scraped off from the attached frost Fa on the surface of the fin by the rotating brush 41 on the exit side from the fin 2 of the rotating brush 41 because the rotating brush 41 rotates from the rear side to the front side. Is scraped in the direction indicated by the arrow V2 and is smoothly discharged outward from the fins 2.

  Therefore, the scraping action by the rotating brush 41 reduces the amount of residual frost Fb remaining on the fin surface 2c after defrosting, regardless of whether the rotating brush 41 is moved downward or upward, and extremely high defrosting. An effect is obtained. As a result, the heat transfer efficiency in the fins 2 is restored, and the ventilation resistance between the fins is reduced. Due to these synergistic effects, the heat exchanger 1 has a high heat exchange.

  By the way, as described above, when the fin ambient temperature is lower than the predetermined temperature near the freezing point, the frost adheres to the fin surface strongly, and when the fin ambient temperature is higher than the predetermined temperature near the freezing point, the landing occurs. The adhesion force of the frost to the fin surface is weak. As described above, the ambient temperature of the fin 2 affects the property of frost formation (mainly the adhesion force to the fin surface 2c). There are humidity and fin surface temperature.

  Therefore, in order to obtain a high defrosting effect, it is effective to optimally set the operation mode of the rotating brush 41 in light of the frosting properties. And as an operation form of the rotating brush 41 effective for obtaining a high defrosting effect, the rotating speed of the rotating brush 41, the moving speed of the rotating brush 41, and the operating frequency of the rotating brush 41 can be considered.

  Here, the rotational speed of the rotary brush 41 corresponds to the impact force to frost formation by the rotary brush 41, and the higher the rotational speed, the higher the impact force applied to the frost formation. The moving speed of the rotating brush 41 corresponds to the number of times of impact force applied to frosting by the rotating brush 41, and the lower the moving speed, the more times the impact force applied to frosting is added. Further, the operation frequency of the rotating brush 41 corresponds to the accumulation of impact force applied to frost formation, and the higher this is, the greater the cumulative impact force against frost formation.

  Therefore, in the brush defrosting means 4 provided with the rotary brush 41, for example, when the fin ambient temperature is equal to or lower than a predetermined temperature near the freezing point, the fixing force to the fin surface 2c of frost formation is weak, so Even if the rotational speed of the rotary brush 41 is set low, the moving speed of the rotary brush 41 is set high, or the operation frequency of the rotary brush 41 is set low, a high defrosting effect can be obtained.

  On the other hand, when the fin ambient temperature is equal to or higher than a predetermined temperature near the freezing point, the frosting is strongly fixed to the fin surface 2c, but the rotational speed of the rotary brush 41 is set high or the rotary brush 41 is moved. A high defrosting effect can be obtained by setting the speed low or setting the operation frequency of the rotating brush 41 high.

  By obtaining such a high defrosting effect, the heat transfer efficiency in the fins 2 is restored, and the ventilation resistance between the fins is reduced. Due to these synergistic effects, the heat exchanger 1 has a high heat exchange. It will be.

  In addition, the rotational speed, the moving speed, and the operation frequency of the rotating brush 41 can be arbitrarily selected according to the conditions on the frosting side, such as adopting any one of them alone or combining them. .

1 is an overall perspective view of a defroster for a heat exchanger according to a first embodiment of the present invention. It is a defrosting state explanatory drawing of the defrosting apparatus shown in FIG. It is III-III sectional drawing of FIG. It is a whole perspective view of the defroster of the heat exchanger which concerns on 2nd Embodiment of this invention. It is a defrosting state explanatory drawing in the descent | fall process of the defrosting apparatus shown in FIG. It is a defrost state explanatory drawing in the raise process of the defrosting apparatus shown in FIG. It is VII-VII sectional drawing of FIG.

Explanation of symbols

1 .. Heat exchanger 2 .. Fin 3 .. Heat transfer tube 4 .. Brush defrosting means 5 .. Defrosting frost means 34 .. Fixed brush 35 .. Supporting body 36 .. Rotating shaft 37. ..Rotating brush 42 ..Rotating shaft 43 ..Bristle 50 ..Drive means 51 ..Slide guide 52 ..Slide guide 53 ..Elevating motor 54 ..Rotating motor 55 ..Slider 56 ..Slider 57・ ・ Bearing 58 ・ ・ Stepping motor Fa ・ ・ Frost frost Fb ・ ・ Residual frost Z1 ・ ・ Defroster Z2 ・ ・ Defroster

Claims (5)

A defroster for a heat source side heat exchanger in a refrigeration apparatus,
With brush defrosting means for scraping and removing frost attached to the fin surface with a brush,
A defroster for a heat exchanger, characterized in that the operation mode of the brush defrosting means is changed corresponding to the environmental conditions at the time of frost generation. In claim 1,
The brush defrosting means scrapes the frost attached to the fin surface by moving while rotating while maintaining the relative position with the fin to scrape the frost attached to the fin surface or moving while rotating. A defroster for a heat exchanger, characterized by comprising a rotating brush. In claim 1 or 2,
Any one of ambient temperature, ambient humidity, fin surface temperature, and evaporating temperature at the time of frost generation is adopted as the environmental condition. In claim 3,
The brush defrosting means includes the fixed brush,
When the fin ambient temperature is below a predetermined temperature near the freezing point, the moving speed of the brush is set low, or / and the brush operating frequency is set low, and / or the brush angle is set small,
When the fin ambient temperature is equal to or higher than a predetermined temperature near the freezing point, the brush moving speed is increased, and / or the brush operating frequency is increased, or / and the brush angle is set large. Heat exchanger defrosting device. In claim 3,
The brush defrosting means includes the rotating brush,
When the fin ambient temperature is below a predetermined temperature near the freezing point, the brush rotation speed is set low, or / and the brush moving speed is set high, and / or the brush operating frequency is set low,
When the fin ambient temperature is equal to or higher than a predetermined temperature near the freezing point, the brush rotation speed is set high, and / or the brush moving speed is set low, and / or the brush operating frequency is set high. Heat exchanger defrosting device.

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