JP2009243756A - Defrosting device of heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide high defrosting effect by combining a defrosting means for removing frost by lowering fixing force of the frost by using a brush and the like, and a defrosting means for removing the frost by blowing off the frost by air jet flow. <P>SOLUTION: This defrosting device comprising the first defrosting means for removing the frost by lowering fixing force of the frost on fin surfaces, and the second defrosting means for removing the frost by blowing off the frost on the fin surfaces by air jet flow. According to this constitution, high defrosting effect is obtained even when the fixing force of the frost to the fin surfaces is strong, by synergistic action by combination of specific defrosting mechanisms of the first defrosting means and the second defrosting means in comparison with a case when each defrosting means is independently operated in defrosting. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a defroster for a heat source side heat exchanger in a refrigeration apparatus.

  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 and Patent Document 2).

  The defrosting device shown in Patent Document 1 removes the defrosting device by impacting frosting with a brush that moves up and down along the surface of the heat exchanger and reducing the fixing force to the fin surface.

  The defrosting device shown in Patent Document 2 has a nozzle disposed on the lower side of the heat exchanger, blows an air jet sprayed from the nozzle toward the fin side, and blows away frost on the fin surface to remove it. It is.

Japanese Utility Model Publication No. 6-59769 Japanese Utility Model Publication No. 11-118302

  However, the nature of frost adhering to the fin surface of the heat exchanger is not constant, and varies depending on the environmental conditions at the time of frost generation, and the fixing force to the fin surface changes.

  Therefore, in the actual defrosting, the defrosting by scraping using a brush as shown in Patent Document 1 or the defrosting by the blow-off action by the air jet as shown in Patent Document 2 can be removed. In some cases, no frost may remain on the fin surface, and there is room for improvement in terms of the defrosting effect.

  Therefore, the present invention combines a defrosting means that reduces and removes the fixing force of the frost on the fin surface by the impact of a brush, etc., and a defrosting means that blows and removes the frost by an air jet. The purpose of the present invention is to provide a defrosting device that can obtain a high defrosting effect as a whole by properly using the above.

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

  In 1st invention of this application, in the defroster of the heat source side heat exchanger in a freezing apparatus, the 1st defrost means which removes the frost adhering to a fin surface by reducing the adhering force to a fin surface, and a fin A second defrosting means for removing frost adhering to the surface by blowing off with an air jet is provided.

  In the second invention of the present application, in the defrosting device for a heat exchanger according to the first invention, the first defrosting means imparts a scraping action to frosting to provide a fixing force to the fin surface. It is characterized by comprising a scraping mechanism for lowering or a melting mechanism for imparting a melting action to frosting and reducing the fixing force to the fin surface.

  In 3rd invention of this application, in the defroster of the heat exchanger which concerns on the said 1st or 2nd invention, it is the structure which operates the said 1st defrost means and a 2nd defrost means simultaneously. It is a feature.

  In 4th invention of this application, in the defroster of the heat exchanger which concerns on the said 1st or 2nd invention, either one of the said 1st defrost means and a 2nd defrost means is always drive | operated, Either one of them is characterized in that it is additionally operated when only the one defrosting means is insufficient for the required defrosting capacity.

  In the fifth invention of the present application, in the defrosting device for a heat exchanger according to the fourth invention, the lack of the defrosting capacity is determined based on the ventilation resistance between the fins, the power consumption of the blower fan, or the heat of the heat exchanger. It is characterized by detecting based on a decrease in exchange capacity.

  In the sixth invention of the present application, in the defroster for a heat exchanger according to the third or fourth invention, the first defrosting means and the second defrosting means are both arranged in the ventilation direction in the fin. It arrange | positions in the upstream, or it has arrange | positioned separately in the upstream and downstream of the ventilation direction in the said fin, It is characterized by the above-mentioned.

  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 removes frost adhering to the fin surface by reducing the fixing force to the fin surface. Since the defrosting means and the second defrosting means for removing the frost attached to the fin surface by blowing off with an air jet are provided, even if the fixing force of frosting on the fin surface is strong, The first defrosting means and the second defrosting means are combined with the specific defrosting mechanisms, respectively, so that they work synergistically, and each of these defrosting means is operated independently to perform defrosting. Compared to such a case, a higher defrosting effect can be obtained.

  (B) According to the defroster for a heat exchanger according to the second invention of the present application, the first defrosting means imparts a scraping action to frost to reduce the fixing force to the fin surface. Since it is composed of a scraping mechanism or a melting mechanism that imparts a melting action to frost and lowers the adhesion force to the fin surface, any of these mechanisms can reduce the adhesion force of frost to the fin surface. Therefore, the effect described in the above (a) is further 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 this invention, since the first defrosting means and the second defrosting means are operated simultaneously, the specific defrosting functions of the respective defrosting means act synergistically, and more A higher defrosting effect can be obtained.

  (D) According to the defroster for a heat exchanger according to the fourth invention of the present application, in addition to the effect described in the above (a) or (b), the following specific effect is obtained. That is, in the present invention, either one of the first defrosting means and the second defrosting means is always operated, and either one is insufficient with respect to the required defrosting capacity only with the one defrosting means. Since additional operation is sometimes performed, the defrosting capacity more than necessary is eliminated, the defrosting capacity is optimized, and the operating cost of the defroster can be reduced.

  (E) According to the defroster for a heat exchanger according to the fifth invention of the present application, the following specific effects can be obtained in addition to the effects described in (d) above. That is, in the present invention, the lack of the defrosting capability is detected based on the ventilation resistance between the fins, the power consumption of the blower fan, or the decrease in the heat exchange capability of the heat exchanger. Since the power consumption and heat exchange capacity of the fan both change proportionally with the amount of frost formation, it is possible to accurately determine the lack of defrosting capacity. Is further promoted.

  (F) According to the defroster for a heat exchanger according to the sixth invention of the present application, in addition to the effects described in (c) or (d) above, the following specific effects are obtained. That is, in the present invention, the first defrosting means and the second defrosting means are both arranged on the upstream side of the fin in the ventilation direction, or separated into the upstream and downstream sides of the fin in the ventilation direction. However, in this case, when both the first defrosting unit and the second defrosting unit are arranged on the upstream side in the ventilation direction of the fin, the movement mechanism of the defrosting unit can be shared. Therefore, the structure can be simplified and reduced in size and cost. Further, when the first defrosting unit and the second defrosting unit are arranged separately on the upstream side and the downstream side in the ventilation direction of the fin, the degree of freedom of layout of each of the defrosting units is improved. At the same time, particularly in the case where the first defrosting means receives an action such that frost is pushed into the back side of the fin, the pushed frost is pushed back by the second defrosting means and discharged from the fin. Can be promoted.

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 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. Brush defrosting means 4 for removing the frost adhered to the surface of each fin 2 of the exchanger 1 by applying an impact force with a brush to reduce the fixing force to the fin surface 2c and removing the frost on the fin surface 2c. It is provided with an injection defrosting means 6 that blows and removes an air jet toward the frost.

  The brush defrosting means 4 corresponds to the “first defrosting means” in the claims, and the jet defrosting means 6 corresponds to the “second defrosting means” in the claims. To do.

"Brush defrosting means 4"
As shown in FIGS. 1 to 3, the brush defrosting means 4 wipes the surface of the fin 2 of the heat exchanger 1 and gives an impact force to the frost adhering to the surface to the frosted fin surface 2 c. A fixed brush 34 that scrapes and removes the fixing force while reducing the fixing force, and a driving means 50 that drives the fixed brush 34 up and down along the ventilation surface 1a in the heat exchanger 1 are configured. .

  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. Further, fixed portions 38 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.

  One fixed portion 38 of the fixed brush 34 is supported by the bearing 57 on the slide guide 51 side, and the other fixed portion 38 is supported by the bearing 57 on the slide guide 52 side in a non-rotating manner.

  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.

"Injection defrosting means 6"
As shown in FIGS. 1 to 4, the jet defrosting means 6 forms an air passage 45 inside the support 35 in the fixed brush 34 of the brush defrosting means 4, and A large number of spray nozzles 46 are provided on the surface of the brush bristle planting side, pressurized air is supplied from the air hose 39 through the inside of the fixed portion 38 to the air passage 45 side, and heat is exchanged from the spray nozzles 46. It is configured to blow out as a jet A toward the container 1 side.

“Defrosting by brush defrosting means 4 and jet defrosting means 6”
In this embodiment, since the jet defrosting means 6 is provided on the support 35 side of the brush defrosting means 4 as described above, the defrosting target parts by both of them are substantially the same part.

  The brush defrosting means 4 and the jet defrosting means 6 are operated in the following three forms.

The first operation mode is a mode in which the brush defrosting means 4 and the jet defrosting means 6 are always operated in parallel to perform defrosting in cooperation with both of them.
In the second operation mode, the brush defrosting unit 4 is mainly operated, and when the defrosting by the brush defrosting unit 4 alone is insufficient, the jet defrosting unit 6 is additionally operated. , It is a form to defrost in cooperation of both of these,
In the third operation mode, the spray defrosting means 6 is mainly operated, and when the defrosting capability by the defrosting only by the spray defrosting means 6 is insufficient, the brush defrosting means 4 is additionally operated. In this mode, the defrosting is performed in cooperation with both of them. However, this third mode of operation cannot be realized by the defrosting device of this embodiment (because the brush defrosting means 4 and the jet defrosting means 6 are integrated), and the second embodiment described below. This can be realized only when the brush defrosting means 4 and the jet defrosting means 6 are configured separately as in the embodiment and the position of the brush defrosting means 4 can be changed between the operating position and the non-operating position. (See FIG. 7).

  Of these operating modes, in the second operating mode and the third operating mode, it is necessary to detect a state in which the defrosting capacity is insufficient. In this embodiment, it is attached to the fin surface 2c. If frost is present, the frosting reduces the ventilation area between the fins, which increases the resistance to ventilation, increases the power consumption of the blower fan, and further increases the heat exchange capacity of the heat exchanger 1 itself. Since it decreases, the lack of defrosting capability is determined based on the ventilation resistance, the power consumption of the blower fan, or the heat exchange capability of the heat exchanger 1.

  Here, defrosting by the brush defrosting means 4 and defrosting by the jet defrosting means 6 will be described.

"Defrosting with brush defrosting means 4"
The brush defrosting means 4 moves up and down (moves in the directions of arrows U and D in FIG. 1) by moving the fixed brush 34 along the surface 1a of the heat exchanger 1 by the driving means 50. 2c frost formation is removed. That is, as shown in FIG. 2, as the fixed brush 34 moves, the brush bristle 37 applies an impact force to the adhering frost Fa on the fin surface 2c to reduce its fixing force, and the brush bristle 37 Adhering frost Fa is wiped off, and frost is scraped off from fin surface 2c. By scraping off the fixed brush 34 with the bristle 37, most of the adhering frost Fa on the fin surface 2c is scraped off, so that a slight residual frost Fb exists between the adjacent heat transfer tubes 3, and the fin 2 As the heat transfer efficiency in the heat exchanger recovers, the ventilation resistance between the fins decreases, and the heat exchanger 1 has a high heat exchange due to a synergistic effect thereof.

"Defrosting by jet defrosting means 6"
The jet defrosting means 6 performs the defrosting by blowing the air jet A to the fin surface 2c side and blowing the frost along with the movement of the fixed brush 34 of the brush defrosting means 4. In this case, in the first and second defrosting modes, the brush defrosting unit 4 is simultaneously operated when the jet defrosting unit 6 is operated, and in the third defrosting mode, the jet defrosting is performed. Since it is determined that the defrosting capability of the means 6 alone is insufficient, the brush defrosting means 4 is also operated together with the jet defrosting means 6. Defrosting is performed more effectively by blowing the air jet A by the jet defrosting means 6 to the place where the fixing force of frost formation on the fin surface 2c is reduced by the defrosting action.

  Further, in the third defrosting mode, when it is determined that the defrosting capability is sufficient by the single operation of the jet defrosting means 6, the defrosting is performed only by the jet defrosting means 6. (Not shown).

  In this way, the brush defrosting means 4 and the jet defrosting means 6 are combined to constitute the defrosting device Z1, and the brush defrosting means 4 and the jet defrosting means 6 are combined with frosting characteristics (in particular, fins). A high defrosting effect can be obtained at any time by properly using it in accordance with the adhesive strength to the surface 2c.

In this embodiment, the jet defrosting means 6 uses pressurized air and takes a technique of blowing frost with the velocity energy of the air jet A, and does not mention the temperature. However, it is not limited to such a configuration. For example, in other embodiments, this pressurized air can be warm air. Thus, according to the structure which injects warm air to frost, not only the effect | action which blows off hand frost but melt | dissolves frost with the heat and can reduce the adhering force. That is, the jet defrosting means 6 can function not only as the “second defrosting means” in the claims but also as the “first defrosting means”. While being promoted, in some cases, the brush defrosting means 4 is abolished by using the jet defrosting means 6 as both the “first defrosting means” and the “second defrosting means”. Is also possible.
II: Second Embodiment FIG. 5 shows a defrosting device Z2 according to a second embodiment of the present invention. This defrosting device Z2 includes the brush defrosting means 4 using the fixed brush 34 and the jet defrosting means 6 similarly to the defrosting device Z1 according to the first embodiment. And the basic composition is the same as that of the defroster Z1 of the said 1st Embodiment.

  And the point from which the defrosting apparatus Z2 which concerns on this 2nd Embodiment differs from the defrosting apparatus Z1 which concerns on the said 1st Embodiment is that the said injection | emission defrosting means 6 differs from the said brush defrosting means 4 separately. As a modified example, the spray defrosting means 6 is also disposed on the opposite side of the brush defrosting means 4 with the heat exchanger 1 interposed therebetween (that is, downstream of the heat exchanger 1 in the ventilation direction). It is a point that can be arranged.

  Accordingly, here, the differences will be mainly described, and the other configurations and operational effects will be the same as those in FIGS. 5 to 7 corresponding to the members described in FIGS. The corresponding explanation in the first embodiment is used, and the explanation here is omitted.

  As shown in FIG. 5, the jet defrosting means 6 includes a pair of upper and lower air tubes 47, 47 arranged in parallel with a predetermined distance in the vertical direction with respect to the support 35 of the brush defrosting means 4. A number of injection nozzles 46 are provided, and compressed air can be supplied to the air tubes 47 and 47 through air hoses 39, respectively. The air pipes 47 and 47 are fixed to the bearing 57 provided on the driving means 50 side, and are moved up and down integrally with the fixed brush 34. Here, the air tubes 47 are arranged above and below the fixed brush 34, respectively, but in other embodiments, only one of them may be used. In some cases, as shown by “reference numeral 47 ′” in FIG. 6, the air pipe 47 is connected to the opposite side of the brush defrosting means 4 across the heat exchanger 1, that is, the heat exchanger 1. It is also possible to arrange it on the downstream side in the ventilation direction.

  Here, the defrosting action using both the brush defrosting means 4 and the jet defrosting means 6 will be described with reference to FIG.

  The brush defrosting means 4 removes frost formation on the fin surface 2 c by moving the fixed brush 34 up and down along the surface 1 a of the heat exchanger 1 by the driving means 50. That is, as shown in FIG. 6, with the movement of the fixed brush 34, the brush bristle 37 applies an impact force to the adhering frost Fa on the fin surface 2c to reduce its adhering force. Adhering frost Fa is wiped off, and frost is scraped off from fin surface 2c. By scraping off the fixed brush 34 with the bristle 37, most of the adhering frost Fa on the fin surface 2c is scraped off, so that a slight residual frost Fb exists between the adjacent heat transfer tubes 3, and the fin 2 As the heat transfer efficiency in the heat exchanger recovers, the ventilation resistance between the fins decreases, and the heat exchanger 1 has a high heat exchange due to a synergistic effect thereof.

  The jet defrosting means 6 performs the defrosting by blowing the air jet A to the fin surface 2c side and blowing the frost along with the movement of the fixed brush 34 of the brush defrosting means 4. In this case, in the first and second defrosting modes, the brush defrosting unit 4 is simultaneously operated when the jet defrosting unit 6 is operated, and in the third defrosting mode, the jet defrosting is performed. Since it is determined that the defrosting capability of the means 6 alone is insufficient, the brush defrosting means 4 is also operated together with the jet defrosting means 6. Defrosting is performed more effectively by blowing the air jet A by the jet defrosting means 6 to the place where the fixing force of frost formation on the fin surface 2c is reduced by the defrosting action.

  Note that the pair of upper and lower air tubes 47, 47 of the jet defrosting means 6 are always used at the same time, and, for example, when the fixed brush 34 moves up and down in accordance with the ascending / descending direction of the fixed brush 34. Only the lower air pipe 47 is effective, and conversely, when the fixed brush 34 moves downward, only the upper air pipe 47 is effective, and the fixing force is always reduced by the operation of the brush defrosting means 4. The frost can also be configured to be blown away by the air jet A.

  In this way, the brush defrosting means 4 and the jet defrosting means 6 are combined to constitute the defrosting device Z2, and the brush defrosting means 4 and the jet defrosting means 6 are subjected to frosting characteristics (in particular, fins). A high defrosting effect can be obtained at any time by properly using it in accordance with the adhesive strength to the surface 2c.

  By the way, in the third defrosting mode, when it is determined that the defrosting capability is sufficient by the single operation of the jet defrosting means 6, the defrosting is performed only by the jet defrosting means 6. However, the operation | movement in the defrost form which concerns is not realizable with the structure shown in FIG. In order to realize the third defrosting mode, as shown in FIG. 7, the fixed brush 34 of the brush defrosting means 4 is configured to be rotatable, and the fixed brush 34 is moved to an operating position shown by a solid line. It is necessary to make it possible to change the position between the non-actuated positions shown in FIG.

In this embodiment, it is needless to say that warm air can be used as the pressurized air.
III: Third Embodiment FIG. 8 shows a defrosting device Z3 according to a third embodiment of the present invention. This defrosting device Z3 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. Brush defrosting means 4 for removing the frost adhered to the surface of each fin 2 of the exchanger 1 by applying an impact force with a brush to reduce the fixing force to the fin surface 2c and removing the frost on the fin surface 2c. It is provided with an injection defrosting means 6 that blows and removes an air jet toward the frost.

  The brush defrosting means 4 corresponds to the “first defrosting means” in the claims, and the jet defrosting means 6 corresponds to the “second defrosting means” in the claims. To do.

"Brush defrosting means 4"
As shown in FIGS. 8 and 9, the brush defrosting means 4 wipes the surface of the fin 2 of the heat exchanger 1 and scrapes and removes frost adhering 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. 8, 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 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

  Note that the relative distance between the heat exchanger 1 and the rotary brush 41 in the ventilation direction of the heat exchanger 1 is the brush of the rotary brush 41 disposed on the front edge 2a side of the fin 2, as shown in FIG. The size of the bristles 43 is set such that the tip of the bristles 43 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 is moved down along the heat exchanger 1 as shown in FIG. 8 with the intention of scraping the frost scraped off by the rotary brush 41 out of the fins. In both cases, the rotational direction of the rotating brush 41 is set so that the rotating brush 41 rotates from the rear side to the front side in the traveling direction on the heat exchanger 1 side. Therefore, the rotation direction of the rotating brush 41 is opposite between the upward movement and the downward movement.

"Injection defrosting means 6"
As shown in FIGS. 7 and 8, the jet defrosting means 6 forms an air passage 45 in the rotating shaft 42 of the rotary brush 41 of the brush defrosting means 4 and the peripheral wall of the air passage 45. A large number of injection nozzles 46 are provided, pressurized air is supplied from the air hose 39 to the air passage 45 side, and this is blown out as a jet A from the injection nozzles 46 toward the heat exchanger 1 side. Has been.

“Defrosting by brush defrosting means 4 and jet defrosting means 6”
In this embodiment, since the said jet defrosting means 6 is provided in the rotating shaft 42 side of the said brush defrosting means 4 as mentioned above, the defrost object site | part by these both is made into the substantially the same site | part.

  The brush defrosting means 4 and the jet defrosting means 6 are operated in the following three forms.

The first operation mode is a mode in which the brush defrosting means 4 and the jet defrosting means 6 are always operated in parallel to perform defrosting in cooperation with both of them.
In the second operation mode, the brush defrosting unit 4 is mainly operated, and when the defrosting by the brush defrosting unit 4 alone is insufficient, the jet defrosting unit 6 is additionally operated. , It is a form to defrost in cooperation of both of these,
In the third operation mode, the spray defrosting means 6 is mainly operated, and when the defrosting capability by the defrosting only by the spray defrosting means 6 is insufficient, the brush defrosting means 4 is additionally operated. In this mode, the defrosting is performed in cooperation with both of them. However, this third mode of operation cannot be realized by the defroster of this embodiment (because the brush defrosting means 4 and the jet defrosting means 6 are integrated), and the fourth embodiment described below. Only when the brush defrosting means 4 and the jet defrosting means 6 are configured as separate bodies as in the embodiment (see FIG. 10).

  Of these operating modes, in the second operating mode and the third operating mode, it is necessary to detect a state in which the defrosting capacity is insufficient. As in the case of the embodiment, if frost is formed on the fin surface 2c, the frosting reduces the ventilation area between the fins, which increases the ventilation resistance or increases the power consumption of the blower fan. In addition, since the heat exchange capacity itself of the heat exchanger 1 is lowered, it is determined whether the defrosting capacity is insufficient based on the ventilation resistance, the power consumption of the blower fan, or the heat exchange capacity of the heat exchanger 1. Yes.

  Here, the defrosting by the brush defrosting means 4 and the defrosting by the jet defrosting means 6 will be described based on FIG.

"Defrosting with brush defrosting means 4"
When the rotating brush 41 moves downward (in the direction of arrow D), the brush defrosting means 4 rotates with the bristles 43 of the rotating brush 41 entering between the fins and adheres to the fin surface 2c. Scraping is carried out sequentially while reducing the fixing force to the fin surface 2c by applying the impact force of Fa. In this case, as indicated by the arrow R, the rotating brush 41 rotates from the rear side to the front side in the traveling direction (that is, the descending direction) on the heat exchanger 1 side. On the exit side from the fin 2, 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 V <b> 1, and smoothly from the fin 2 outward. Will be discharged.

  Similarly, when the rotary brush 41 moves upward (in the direction of the arrow U), as indicated by the arrow L, the rotary brush 41 moves rearward in the traveling direction (that is, in the upward direction) on the heat exchanger 1 side. Since it rotates from the side toward the front side (see FIG. 8), on the exit side of the rotating brush 41 from the fin 2, the rotating brush 41 sequentially scrapes off the attached frost Fa on the surface of the fin. The frost is scraped and is smoothly discharged outward from the fins 2.

  Accordingly, 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 moved upward. While the heat transfer efficiency is restored, the ventilation resistance between the fins is reduced, and due to these synergistic effects, the heat exchanger 1 has a high heat exchange.

"Defrosting by jet defrosting means 6"
The jet defrosting means 6 performs the defrosting by blowing the air jet A toward the fin surface 2c side and blowing the frost along with the movement of the rotating brush 41 of the brush defrosting means 4. In this case, in the first and second defrosting modes, the brush defrosting unit 4 is simultaneously operated when the jet defrosting unit 6 is operated, and in the third defrosting mode, the jet defrosting is performed. Since it is determined that the defrosting capability of the means 6 alone is insufficient, the brush defrosting means 4 is also operated together with the jet defrosting means 6. Defrosting is performed more effectively by blowing the air jet A by the jet defrosting means 6 to the place where the fixing force of frost formation on the fin surface 2c is reduced by the defrosting action.

  Further, in the third defrosting mode, when it is determined that the defrosting capability is sufficient by the single operation of the jet defrosting means 6, the defrosting is performed only by the jet defrosting means 6. (Not shown).

  In this way, the brush defrosting means 4 and the jet defrosting means 6 are combined to constitute the defrosting device Z3, and the brush defrosting means 4 and the jet defrosting means 6 are combined with frosting characteristics (in particular, fins). A high defrosting effect can be obtained at any time by properly using it in accordance with the adhesive strength to the surface 2c.

In this embodiment, the jet defrosting means 6 uses pressurized air and takes a technique of blowing frost with the velocity energy of the air jet A, and does not mention the temperature. However, it is not limited to such a configuration. For example, in other embodiments, this pressurized air can be warm air. Thus, according to the structure which injects warm air to frost, not only the effect | action which blows off hand frost but melt | dissolves frost with the heat and can reduce the adhering force. That is, the jet defrosting means 6 can function not only as the “second defrosting means” in the claims but also as the “first defrosting means”. While being promoted, in some cases, the brush defrosting means 4 is abolished by using the jet defrosting means 6 as both the “first defrosting means” and the “second defrosting means”. Is also possible.
IV: Fourth Embodiment FIG. 10 shows a defrosting device Z4 according to a fourth embodiment of the present invention. This defroster Z4 includes brush defrosting means 4 using a rotating brush 41 and jet defrosting means 6 in the same manner as the defroster Z3 according to the third embodiment. And the basic composition is the same as that of the defroster Z3 of the said 3rd Embodiment.

  And the point from which the defrosting apparatus Z4 which concerns on this 4th Embodiment differs from the defrosting apparatus Z3 which concerns on the said 3rd Embodiment differs in the said spray defrosting means 6 from the said brush defrosting means 4 separately. As a modified example, the spray defrosting means 6 is also disposed on the opposite side of the brush defrosting means 4 with the heat exchanger 1 interposed therebetween (that is, downstream of the heat exchanger 1 in the ventilation direction). It is a point that can be arranged.

  Therefore, here, the difference will be mainly described, and the other configurations and functions and effects will be the same as those in FIGS. 10 and 11 corresponding to the members in FIGS. 8 and 9. The corresponding explanation in the third embodiment is used, and the explanation here is omitted.

  As shown in FIG. 10, the jet defrosting means 6 includes a pair of upper and lower air tubes 47, 47 arranged in parallel in the vertical direction with a predetermined distance from the rotating brush 41 of the brush defrosting means 4. A number of injection nozzles 46 are provided, and compressed air can be supplied to the air tubes 47 and 47 through air hoses 39, respectively. The air pipes 47 and 47 are fixed to the bearing 57 provided on the driving means 50 side, and are moved up and down integrally with the fixed brush 34.

  Here, the air tubes 47 are arranged above and below the rotating brush 41, respectively, but in other embodiments, only one of them may be used. In some cases, as shown by “reference numeral 47 ′” in FIG. 11, the air pipe 47 is connected to the opposite side of the brush defrosting means 4 across the heat exchanger 1, that is, the heat exchanger 1. It is also possible to arrange it on the downstream side in the ventilation direction.

  Here, the defrosting action using both the brush defrosting means 4 and the jet defrosting means 6 will be described with reference to FIG.

  The brush defrosting means 4 moves up and down along the surface 1a of the heat exchanger 1 by the driving means 50 while the rotary brush 41 rotates, thereby removing frost formation on the fin surface 2c. That is, as shown in FIG. 11, with the rotation and movement of the rotary brush 41, the brush bristles 43 give an impact force to the adhering frost Fa on the fin surface 2c to reduce its adhering force and the brush bristles. 43 wipes off the attached frost Fa, whereby the frost is scraped off from the fin surface 2c. By scraping off the brush bristles 43 of the rotating brush 41, most of the adhering frost Fa on the fin surface 2c is scraped off, and a slight residual frost Fb exists between the adjacent heat transfer tubes 3, and the fin 2 As the heat transfer efficiency in the heat exchanger recovers, the ventilation resistance between the fins decreases, and the heat exchanger 1 has a high heat exchange due to a synergistic effect thereof.

  The jet defrosting means 6 performs the defrosting by blowing the air jet A toward the fin surface 2c side and blowing the frost along with the movement of the rotating brush 41 of the brush defrosting means 4. In this case, in the first and second defrosting modes, the brush defrosting unit 4 is simultaneously operated when the jet defrosting unit 6 is operated, and in the third defrosting mode, the jet defrosting is performed. Since it is determined that the defrosting capability of the means 6 alone is insufficient, the brush defrosting means 4 is also operated together with the jet defrosting means 6. Defrosting is performed more effectively by blowing the air jet A by the jet defrosting means 6 to the place where the fixing force of frost formation on the fin surface 2c is reduced by the defrosting action.

  Further, in the third defrosting mode, when it is determined that the defrosting capability is sufficient by the single operation of the jet defrosting means 6, the defrosting is performed only by the jet defrosting means 6. .

  The pair of upper and lower air tubes 47, 47 of the jet defrosting means 6 are always used at the same time. For example, when the rotary brush 41 moves up and down in accordance with the ascending / descending direction of the rotary brush 41, for example. Only the lower air pipe 47 is effective, and conversely, when the rotary brush 41 moves downward, only the upper air pipe 47 is effective, and the fixing force is always reduced by the operation of the brush defrosting means 4. The frost can also be configured to be blown away by the air jet A.

  In this way, the brush defrosting means 4 and the jet defrosting means 6 are combined to constitute the defrosting device Z4, and the brush defrosting means 4 and the jet defrosting means 6 are combined with frosting characteristics (in particular, fins). A high defrosting effect can be obtained at any time by properly using it in accordance with the adhesive strength to the surface 2c.

  In this embodiment, it is needless to say that warm air can be used as the pressurized air.

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 by the defrosting apparatus shown in FIG. It is III-III sectional drawing of FIG. It is an enlarged view of the IV section 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 defrost state explanatory drawing by the defrosting apparatus shown in FIG. It is a defrost state explanatory drawing in the other structural example of the defrosting apparatus shown in FIG. It is a whole perspective view of the defroster of the heat exchanger which concerns on 3rd Embodiment of this invention. It is defrost state explanatory drawing by the defrosting apparatus shown in FIG. It is a whole perspective view of the defroster of the heat exchanger which concerns on 4th Embodiment of this invention. It is a defrosting state explanatory drawing by the defrosting apparatus shown in FIG.

Explanation of symbols

1 .. Heat exchanger 2 .. Fin 3 .. Heat transfer tube 4 .. Brush defrosting means 6 .. Injection defrosting means 34 .. Fixed brush 35 .. Support 36 .. Rotating shaft 37. ..Fixing part 41 ..Rotating brush 42 ..Rotating shaft 43 ..Brush hair 45 ..Air passage 46 ..Injection nozzle 47 ..Air tube 50 ..Drive means 51 ..Slide guide 52 ..Slide guide 53・ ・ Moving motor 54 ・ ・ Rotating motor 55 ・ ・ Slider 56 ・ ・ Slider 57 ・ ・ Bearing 58 ・ ・ Stepping motor A ・ ・ Jet flow Fa ・ ・ Frost frost Fb ・ ・ Residual frost Z1 to Z4 ・ ・ Defrosting device

Claims (6)

A defroster for a heat source side heat exchanger in a refrigeration apparatus,
A first defrosting means for removing frost adhering to the fin surface by reducing the fixing force to the fin surface;
A defroster for a heat exchanger, comprising a second defrosting means for removing frost adhering to the fin surface by blowing off with an air jet. In claim 1,
The first defrosting means is a scraping mechanism that reduces the fixing force to the fin surface by imparting a scraping action to the frost, or reduces the fixing force to the fin surface by adding a melting action to the frost. A defroster for a heat exchanger, characterized by comprising a melting mechanism. In claim 1 or 2,
A defroster for a heat exchanger, characterized in that the first defrosting means and the second defrosting means are operated simultaneously. In claim 1 or 2,
Either one of the first defrosting means and the second defrosting means is always operated, and either one is additionally operated when only the one defrosting means is insufficient for the required defrosting capacity. The defroster of the heat exchanger characterized by the above-mentioned. In claim 4,
A defrosting device for a heat exchanger, wherein the lack of defrosting capability is detected based on ventilation resistance between fins, power consumption of a blower fan, or a decrease in heat exchange capability of a heat exchanger. In claim 3 or 4,
The first defrosting means and the second defrosting means are both arranged on the upstream side of the fin in the ventilation direction, or are arranged separately on the upstream side and the downstream side of the fin in the ventilation direction. A heat exchanger defrosting device.

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