JP2008309399A - Defrosting device for cooler and showcase - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a defrosting device of a cooler, and a showcase capable of improving defrosting efficiency while keeping cooling performance with a simple constitution. <P>SOLUTION: A duct case 38 is disposed to partition an airflow upstream-side region 36a and a downstream-side region 36b in a central passage portion 36, and a through hole 56 which is closed by frost formation in a cooling operation and kept in a ventilating state in a defrosting operation, is formed on an top face partitioning portion 54a forming a downstream portion 54 at the airflow downstream side with respect to an outlet of an evaporator 44 of the duct case. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a defroster for a cooler, and more particularly to a technique for removing frost attached to the cooler and its surroundings.

In a showcase or the like in which cool air is blown so as to keep the inside of the storage unit at a low temperature, a cooler for sending cool air is provided in an air flow path formed inside the showcase.
As the cooler, an evaporator is generally used in which a refrigerant circulates and forms a refrigeration circuit together with a compressor, a condenser, and an expansion valve.
In such a cooler, since frost adheres to the cooler and its periphery during the cooling operation, it is necessary to periodically perform a defrosting operation for removing the frost.

The defrosting operation is performed by taking warm outside air into the air flow path or by providing a heater on the upstream side of the air flow of the cooler and sending heated warm air to the cooler.
Specifically, in a so-called flat-type showcase, an outside air port for taking in outside air is formed separately from the cold air inlet and outlet of the ventilation passage (air passage), and a damper for opening and closing the outside air port is provided, and defrosting is performed. The structure which open | releases the said damper at the time of a driving | operation and ventilates external air in a ventilation path is disclosed (refer patent document 1).

In a so-called multistage showcase, a blower, a heater, and an evaporator are provided in the air passage in the order of the air flow, and vent holes are formed in the tube plates provided on both ends of the evaporator, and during the defrosting operation, The warm air heated by the heater is sent from the vent hole to the outside of the tube sheet, and the frost adhesion is suppressed by sending relatively high temperature cold air flowing along the inside of the tube plate to the outside of the tube plate even during the cooling operation. A configuration is disclosed (see Patent Document 2).
Japanese Utility Model Publication No. 1-134884 Japanese Utility Model Publication No. 3-46179

However, as in the technique disclosed in Patent Document 1, providing a damper that can be opened and closed to take in outside air has a problem that the structure of the showcase is complicated and the cost is increased.
In addition, when the vent holes are formed in the tube plates on both ends of the evaporator as in the technique disclosed in Patent Document 2, the cooling performance deteriorates because the cold air flows out of the air passage during the cooling operation. There is.

  The present invention has been made to solve such problems, and the object of the present invention is to provide a defroster for a cooler that can improve the defrosting efficiency while maintaining the cooling performance with a simple configuration. And to provide a showcase.

  In order to achieve the above object, in the defroster for a cooler according to claim 1, a cooler provided in an air flow path for cooling an air flow flowing in the air flow path, and an air flow path A defrosting means for heating the airflow that circulates in the air flow path, located on the upstream side of the airflow of the cooler, and a space constituted by the cooler and the airflow path wall, During the operation of the cooler, the cool air flowing out from the air outlet of the cooler is not allowed to recirculate to the upstream side of the air flow, and during the operation of the defrosting means, the warm air passing through the defrosting means is upstream of the air flow And a partitioning member that allows reflux to the side.

A defrosting device for a cooler according to a second aspect of the present invention is the defroster for a cooler according to the first aspect, wherein the partition member is positioned in the vicinity of the air outlet of the cooler, and the partition member has a through hole through which an air flow can flow. And an opening / closing means that closes the through-hole when the cooler is operated and automatically opens and closes according to the temperature so as to open the through-hole when the defrosting means is operated. .
The defroster for a cooler according to a third aspect of the present invention is the defroster for a cooler according to the second aspect, wherein the opening / closing means closes the through-hole by frosting with cold air from the cooler when the cooler is operated, It is the frost which opens this through-hole by defrosting with the warm air from a means.

The defroster for a cooler according to a fourth aspect is characterized in that, in the third aspect, the through hole is formed in a mesh shape.
The showcase according to claim 5, an air flow path formed inside, a blower provided in the air flow path, cooling for cooling an air flow provided in the air flow path and flowing through the air flow path. , A defrosting means for heating the air flow that is located upstream of the cooler in the air flow path and that circulates in the air flow path, and the air that circulates in the air flow path on one side The cooler includes a storage portion in which a blow-out port from which a flow is blown is formed and a suction port through which at least a part of an air flow blown from the blow-out port is sucked is formed on the other side. And a space constituted by the air flow path wall, and the defrosting is not permitted without allowing the cool air flowing out from the air outlet of the cooler to flow back to the upstream side of the air flow when the cooler is operated. When the means is operating, the warm air that has passed through the defrosting means is returned to the upstream side of the air flow. It is characterized by comprising a partition member that allows Rukoto.

The showcase according to claim 6 is the showcase according to claim 5, wherein the partition member is positioned in the vicinity of the air outlet of the cooler, and the partition member is provided with a through hole through which an air flow can flow. An opening / closing means is provided that closes the through-hole when the cooler is operated and automatically opens / closes depending on the temperature so as to open the through-hole when the defrosting means is operated.
In the showcase of claim 7, in claim 6, the opening / closing means closes the through-hole by frosting by the cool air from the cooler when the cooler is operated, and warm air from the defrosting means It is the frost which opens this through-hole by being defrosted by.

The showcase according to claim 8 is characterized in that, in claim 7, the through hole is formed in a mesh shape.
The showcase according to claim 9 is the showcase according to any one of claims 5 to 8, wherein the showcase is a flat showcase in which the housing portion is opened upward, and the cooler is formed in a lower portion of the showcase. Further, it is arranged in the air flow path, and the partition member is arranged to extend from at least the upper side surface of the cooler to the upper wall of the air flow path.

  The showcase according to claim 10 is the showcase according to any one of claims 5 to 8, wherein the showcase is a multistage showcase in which the housing portion is opened forward, and the cooler is formed on a back surface portion of the showcase. The partition member is disposed in a side wall of the air channel from a side surface of the cooler.

  In the defroster and the showcase of the cooler according to claims 1 and 5 of the present invention using the above means, a cooler for cooling the air flow in the air flow path and an air flow downstream of the cooler from the cooler. A defrosting means for heating is provided, and a partition member that partitions a space constituted by the cooler and the air flow path wall is provided. The partition member does not allow the cool air that has passed through the cooler to be returned to the upstream region of the air flow when the cooler is operating (during the cooling operation), and when the defrosting unit is operating (defrosting). During operation, the warm air that has passed through the defrosting means is allowed to return to the upstream region of the airflow.

That is, during the cooling operation, the cool air cooled by the cooler flows along the air flow path to the downstream side of the air flow, and the cooling performance during the cooling operation can be maintained.
On the other hand, during the defrosting operation, warm air that has passed through the cooler from the defrosting means is recirculated to the upstream side of the airflow. Thereby, defrosting of the frost adhering in the airflow upstream area can be promoted.

In particular, in the showcase, warm air is recirculated in the air flow path during the defrosting operation, and the outflow of warm air to the storage unit can be reduced. Thereby, the temperature rise of a storage part at the time of a defrost operation can be suppressed.
From the above, the defroster and the showcase for the cooler according to claims 1 and 5 can achieve the defrosting efficiency with a simple configuration while maintaining the cooling performance.

According to the defroster for a cooler and the showcase according to claim 2 and 6, the partition member is provided at a relatively large temperature change position in the vicinity of the air outlet of the cooler, and a through hole is formed in the partition member. In addition, there is provided an opening / closing means that automatically closes and closes the through-hole according to the temperature so that the through-hole is closed during the cooling operation and opened during the defrosting operation.
That is, during the cooling operation, the through hole is closed by the opening / closing means, so that the cold air cooled by the cooler flows along the air flow path to the downstream side of the air flow. Thereby, the cooling performance during the cooling operation can be maintained.

On the other hand, during the defrosting operation, the through hole is opened by the opening / closing means, and a part of the warm air that has passed through the cooler from the defrosting means flows out to the upstream area of the air flow through the through hole. Thereby, defrosting of the frost adhering in the airflow upstream area can be promoted.
The opening / closing means automatically opens and closes according to the temperature, and maintains the cooling performance during the cooling operation as described above by a simple and low-cost configuration that does not require any special device or control. Meanwhile, the defrosting efficiency during the defrosting operation can be improved.

According to the defrosting device and the showcase of the cooler according to claim 3 and 7, the frost for closing the through hole by frosting during the cooling operation and opening the through hole by defrosting during the defrosting operation is an opening / closing means. To do.
In this way, it is possible to open and close the through-hole by using the frosting by the cooling operation and the defrosting by the defrosting operation without adding a special device or control, and at the time of the cooling operation. It is possible to improve the defrosting efficiency during the defrosting operation while maintaining the cooling performance.

According to the defrosting device and the showcase of the cooler of claims 4 and 8, the through hole is formed in a mesh shape that is easily frosted and easily defrosted, thereby maintaining the cooling performance more reliably. In addition, the defrosting efficiency can be further improved.
According to the showcase of claim 9, the cooler is disposed in the air flow path below the flat showcase, and the partition member is disposed at least from the upper side surface of the cooler over the upper wall of the air flow path. To do.

And the defrosting efficiency can be improved, maintaining the cooling performance in a flat type showcase, when the said division member accept | permits the return of the warm air to the said airflow upstream only at the time of a defrost operation.
According to the showcase of the tenth aspect, the cooler is disposed in the air flow path at the back of the multistage showcase, and the partition member is disposed from the side surface of the cooler to the side wall of the air flow path. .

  And the defrosting efficiency can be improved, maintaining the cooling performance in a multistage showcase, when the said division member accept | permits the return of the warm air to the said airflow upstream only at the time of a defrost operation.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, the first embodiment will be described.
1 to 4, FIG. 1 is a longitudinal sectional view of a showcase provided with a defroster for a cooler according to a first embodiment of the present invention, and FIG. 2 is taken along line AA in FIG. FIG. 3 is a sectional view, FIG. 3 is an enlarged view of the main part of FIG. 1, and FIG. 4 is a schematic perspective view of the duct case in the first embodiment.

As shown in FIGS. 1 and 2, the showcase 1 has two box-shaped storage portions 4 and 6 that are also opened upward in the case body 2 that are open upward, and are arranged side by side in the depth direction of the showcase 1. This is a so-called flat type showcase.
In the showcase 1, an air flow path 10 is formed between the case body 2 and the storage units 4 and 6.

Specifically, the side walls 11, 11 extending in the depth direction on both sides in the width direction of the case body 2 form the side walls of the air flow path 10.
And inhalation is sandwiched between the side wall portions 12 and 14 extending in the width direction on the outer side in the depth direction of the case body 2 and the side surface portions 16 and 18 extending in the width direction on the outer side in the depth direction of the respective storage portions 4 and 6. Passage portions 20 and 22 are formed. Suction port portions 20a and 22a are formed at the upper ends of the suction passage portions 20 and 22, respectively, and open inward in the depth direction.

Further, a blowing passage portion 28 is formed between inner side portions 24 and 26 extending in the width direction on the center side in the depth direction of each of the storage portions 4 and 6. At the upper end of the outlet passage portion 28, outlet portions 28 a and 28 b that are opened outward in the depth direction are formed.
Further, a central passage portion 36 is formed between the bottom wall portion 30 of the case body 2 and the bottom surface portions 32 and 34 of the storage portions 4 and 6. A central plate 30a extending vertically and in the width direction is erected at the center in the depth direction of the bottom wall portion 30 of the case body 2, and the lower half of the central passage portion 36 and the blowout passage portion 28 are in the center. It is divided into one side and the other side in the depth direction by the plate 30a.

  In this manner, in the showcase 1, the wall portions 11, 12, 14, 30 of the case body 2 and the surface portions 16, 18, 24, 26, 32, 34 of the storage portions 4, 6 are connected to the air flow path. Air flows from the suction port portions 20a and 22a on one side and the other side in the depth direction to the blowout port portions 28a and 28b through the suction passage portions 20 and 22, the central passage portion 36, and the blowout passage portion 28. An air flow path 10 is formed.

The air flow path 10 has the same configuration on the one side and the other side in the depth direction, and the configuration on one side will be described below with reference to FIGS. 3 and 4 and the description on the configuration on the other side will be omitted.
The central passage portion 36 of the air flow path 10 is provided with a substantially box-shaped duct case 38 that forms a ventilation path communicating with the blowout passage portion 28 together with the bottom wall portion 30.
Specifically, the upper surface of the duct case 38 extends from the upstream end of the airflow passage 28, that is, from the center in the depth direction of the bottom surface 32 of the storage portion 4 while being inclined toward the outside in the depth direction, and the bottom wall It is connected to the part 30. That is, a part of the air flow upstream region 36 a exists between the upper surface of the duct case 38 and the bottom surface portion 32 of the storage portion 4.

In addition, a circular hole 40a is formed at the center in the width direction outside the depth direction on the upper surface of the duct case 38, and the fan 40 is provided in the circular hole 40a. The fan 40 has a function of blowing air from the air flow upstream side to the air flow downstream side by rotating.
Further, a rod-like heater 42 (defrosting means) extending in the width direction is provided in the duct case 38 on the downstream side of the air flow from the fan 40. The heater 42 has a function of heating an air flow by receiving power from a power source (not shown) and generating heat.

Further, an evaporator 44 (cooler) is provided on the downstream side of the air flow from the heater 42 in the duct case 38. The evaporator 44 is in contact with the inner surface of the duct case 38 except for the air flow inlet and outlet portions.
The evaporator 44 circulates refrigerant and forms a refrigeration circuit together with a compressor, a condenser, and an expansion valve (not shown). More specifically, the evaporator 44 is provided with a plurality of fins 46 arranged in the width direction so as to extend in the air flow direction, and a refrigerant pipe 48 is disposed through the fins 46. The refrigerant pipe 48 has a refrigerant inflow portion 48a located on the downstream side of the air flow, extends in the width direction from the refrigerant pipe 48, bends in a U shape at the end, and snakes up to the refrigerant outflow portion 48b on the upstream side of the air flow. It has a configuration. That is, the refrigerant flow direction in the evaporator 44 and the air flow direction in the air flow path 10 are opposite to each other. Note that the refrigerant inflow portion 48a, the refrigerant outflow portion 48b, the U-shaped bent portion, and the like of the refrigerant pipe 48 protrude outside the duct case 38, that is, in the air flow upstream region 36a.

In the evaporator 44 having the above configuration, the low-temperature refrigerant cooled by the cycle of the refrigeration circuit flows from the refrigerant inflow portion 48a and passes through the refrigerant pipe 48, whereby the air flow and heat flowing through the evaporator 44 are obtained. It has a function of exchanging and cooling the air flow.
Therefore, the duct case 38 in which the evaporator 44 is arranged in this way has an upstream portion 50 that guides the air flow to the evaporator 44 via the fan 40 on the upstream side of the air flow from the evaporator 44, and the evaporator 44. Are disposed, and a downstream portion 54 (a partition member) that guides the air flow from the air outlet of the evaporator 44 to the outlet passage portion 28.

  The downstream portion 54 includes an upper surface partition member 54a constituting a part of the upper surface of the duct case 38, side surface partition members 54b and 54b constituting a part of the side surface of the duct case 38, and the side surface partition members 54b and 54b. The side partition members 54c and 54c extend from the downstream end of the air flow to the side wall of the central passage 36. In other words, the downstream portion 54 forms a space between the evaporator 44 and the air flow path wall of the central passage portion 36 from the air flow upstream region 36 a including the upper side and the side of the evaporator 44 and the outlet of the evaporator 44. It divides into the airflow downstream area | region 36b of an airflow downstream.

A plurality of through holes 56 are formed in the upper surface partition member 54a. The through hole 56 is a small-diameter circular hole, and is formed side by side in the width direction with a predetermined interval.
Hereinafter, the operation of the defroster for a cooler according to the first embodiment of the present invention configured as described above will be described.
First, during the cooling operation of the showcase 1, the fan 40 is rotated and the refrigeration circuit is operated to cool the evaporator 44.

The air flow blown by the fan 40 passes through the inside of the duct case 38 and is cooled by the evaporator 44, and flows from the outlet of the evaporator 44 to the blowing passage portion 28 as cold air.
The cold air passes through the blow-out passage portion 28 and is blown out from the outlet portions 28a and 28b toward the outside in the depth direction, and the inside of the storage portions 4 and 6 is cooled by the cold air, and an air curtain is provided above the storage portions 4 and 6. Is formed.

On the other hand, outside air including cold air blown out from the air outlets 28a and 28b is sucked from the inlet ports 20a and 22a, and the outside air is guided to the fan 40 of the central passage portion 36 through the suction passage portions 20 and 22. .
In this way, the air flow during the cooling operation circulates, but frost adheres to the evaporator 44 and the duct case 38 around it due to the cooling operation.

In particular, the side of the inflow portion 48a into which the low-temperature refrigerant before heat exchange flows in the evaporator 44, that is, the vicinity of the air outlet of the evaporator 44, is likely to be colder than the other portions. For this reason, the downstream part 54 of the duct case 38 located in the vicinity of the air outlet of the evaporator 44 forms frost early, and the through hole 56 of the upper surface partition member 54a is closed by the frost formation.
That is, during the cooling operation, the through-hole 56 is closed by frost formation, so that the air flow upstream region 36a and the air flow downstream region 36b in the central passage portion 36 are completely partitioned. Therefore, all of the cool air cooled by the evaporator 44 goes to the outlet passage portion 28 through the downstream portion 54 of the duct case 38, and the cooling performance by the evaporator 44 is maintained.

By continuing the cooling operation, frost adheres to the inside of the evaporator 44 and the outer periphery of the evaporator part 52 of the duct case, in addition to the duct case downstream part 54.
Therefore, the defrosting operation is periodically performed to remove the frost attached during the cooling operation. In the defrosting operation, the refrigeration cycle is stopped and the heater 42 generates heat.
The air flow blown by the fan 40 is heated by the heat generated by the heater 42 in the upstream portion 50 of the duct case 38 and is sent into the evaporator portion 52 as warm air. And the frost in the said evaporator 44 is removed because the said warm air distribute | circulates the inside of the evaporator 44. FIG.

Moreover, since the downstream part 54 of the duct case 38 is also heated by the warm air that has passed through the evaporator 44, the frost adhered to the downstream part 54 is also removed. That is, the frost that has blocked the through hole 56 of the upper surface partition member 54a is also defrosted, and the through hole 56 is opened and ventilated.
For this reason, a part of the warm air that has come to the downstream portion 54 of the duct case 38 passes through the through hole 56 and flows out to the outside of the duct case 38, that is, the air flow upstream region 36 a. Thereby, the warm air is also sent to the air flow upstream region 36a where the warm air was not directly applied, and the defrosting of the frost adhering to the outer periphery of the duct case 38 can be promoted.

Moreover, since a part of warm air passes through the through-hole 56, and warm air circulates in the center channel | path part 36 by returning to the airflow upstream area | region 36a, the warm air which flows into the blowing channel | path part 28 can be reduced, defrosting The temperature rise of the storage units 4 and 6 at the time can be suppressed.
From the above, in the defroster for a cooler according to the present invention, the through-hole 56 is drilled at a position where the temperature change is large, and no special device or control is added. The defrosting efficiency during the defrosting operation is improved while maintaining the cooling performance during the cooling operation with an extremely simple and low-cost configuration that automatically opens and closes the through hole 56 by utilizing the defrosting by the operation. be able to.

  Here, in the first embodiment, each through hole 56 drilled in the upper surface partition member 54 of the duct case 38 is a circular hole, but the shape of the through hole is not limited to this, and for example, the first hole As a modified example of the embodiment, a mesh-like through hole 56 ′ may be provided in the upper surface partition member 54 ′ of the duct case 38 ′ as in a showcase 1 ′ shown in FIG. 4. Thus, by forming the through hole 56 ′ in a mesh shape that is easily frosted and easily defrosted, the cooling performance can be more reliably maintained, and the defrosting efficiency can be further improved. it can.

  Further, a valve member (opening / closing means) by a thermally driven actuator such as a bimetal capable of opening and closing the through hole 56 may be provided on the upper surface partition member 54a of the duct case 38. The valve member opens and closes depending on the temperature. Like the frost, the valve member is cooled by cold air during the cooling operation to close the through hole, and is heated by warm air during the defrost operation. To drive the through hole. Thus, by providing the valve member by the thermally driven actuator, the through hole can be opened and closed more reliably while suppressing the complication of the configuration.

Next, a second embodiment will be described.
Referring to FIGS. 6 to 8, FIG. 6 is a longitudinal sectional view of a showcase provided with a defroster for a cooler according to a second embodiment of the present invention, and FIG. 7 is taken along the line BB of FIG. FIG. 8 is a sectional view, and FIG. 8 shows a schematic perspective view of the duct case in the second embodiment.
The showcase 60 in the second embodiment is a so-called multistage showcase having a storage portion 64 in which a plurality of shelves 64a are arranged inside a case body 62 that opens to the front.

An air flow channel 66 is formed in the showcase 60 between the case main body 62 and the storage portion 64.
Specifically, the side walls 67 and 67 of the case main body 62 form the side walls of the air flow path 10.
A suction passage portion 72 is formed between the bottom wall portion 68 of the case body 62 and the bottom surface portion 70 of the storage portion 64, and a suction port portion opened upward at the front end of the suction passage portion 72. 72a is formed.

Further, a blowout passage portion 78 is formed between the upper wall portion 74 of the case main body 62 and the upper surface portion 76 of the storage portion 64, and a blowout opening portion opened downward at the front end of the blowout passage portion 78. 78a is formed.
Further, a central passage portion 84 is formed between the rear wall portion 80 of the case body 62 and the rear surface portion 82 of the storage portion 64.

In this manner, in the showcase 60, the wall portions 67, 68, 74, 80 of the case body 62 and the surface portions 70, 76, 82 of the storage portion 64 serve as air flow path walls, and from the suction port portion 72a, An air flow path 66 is formed through which air flows through the suction passage portion 72, the central passage portion 84, and the blowout passage portion 78 to the blowout port portion 78a.
The bottom wall portion 68, the rear wall portion 80, and the rear surface portion of the storage portion 64 of the case main body 62 extend from a substantially central position of the suction passage portion 72 of the air flow channel 66 to a substantially central position of the central passage portion 84. A substantially box-shaped duct case 86 that forms an L-shaped ventilation passage in side view with 82 is provided.

  Specifically, the upper surface of the duct case 86 in the suction passage portion 72 extends forward from the upper end of the air passage of the central passage portion 84, that is, the rear end of the bottom surface portion 70 of the storage portion 64, while inclining. 62 is connected to the bottom wall 68 of the 62. The upper surface of the duct case 86 in the suction passage portion 72 is formed with three circular holes 88a, 88a, 88a arranged in the width direction, and the fans 88, 88, 88 are formed in the respective circular holes 88a. Is provided.

Further, a rod-like heater 90 (defrosting means) extending in the width direction is provided in the duct case 86 on the downstream side of the air flow from each fan 88. The functions of the fans 88 and the heaters 90 are the same as those of the fans 40 and the heaters 42 in the first embodiment.
Further, an evaporator 92 is provided in the duct case 86 in the central passage portion 84. The evaporator 92 is in contact with the inner surface of the duct case 86 except for the air flow inlet and outlet portions.

  Similarly to the evaporator 44 of the first embodiment, the evaporator 92 meanders from the fin 94 and the refrigerant inflow portion 96a on the downstream side of the air flow to the refrigerant outflow portion 96b on the upstream side of the air flow. The refrigerant pipe 96 is disposed in the same manner. That is, also in the second embodiment, the flow direction of the refrigerant in the evaporator 92 and the flow direction of the air flow in the air flow channel 66 are configured to be opposite to each other.

  Therefore, the duct case 86 in which the evaporator 92 is arranged in this way has an upstream portion 98 that guides the air flow to the evaporator 92 via the fans 88 on the upstream side of the air flow from the evaporator 92, the evaporator 92, and the side partition members 102 and 102 (partition members) extending from the side end portion of the air outlet of the evaporator 92 to the side wall of the central passage portion 84. ing. Then, each side partition member 102 divides the space between the evaporator 92 and the air flow path wall of the central passage portion 84 into the air flow upstream regions 84a and 84a on the evaporator 92 side and the evaporator 92. The air flow is divided into an air flow downstream region 84b on the downstream side of the air flow from the outlet.

Each side partition member 102 has a plurality of through-holes 104 that are small-diameter circular holes.
The operation of the defroster for a cooler according to the second embodiment of the present invention thus configured will be described below.
The cooling operation in the showcase 60 operates each fan 88 and the refrigeration circuit as in the first embodiment. The air flow blown by the fan passes through the inside of the duct case 86 and is cooled by the evaporator 92 and is sent to the blow-out passage portion 78 as cold air. Then, the cold air is blown downward from the air outlet 78a, and an air curtain is formed on the front surface of the storage portion 64 while cooling the storage portion 64.

Further, outside air including cold air blown out from the air outlet 78 a is sucked in the suction port portion 72 a, and the outside air is guided to each fan 88 through the suction passage portion 72.
In this way, the air flow during the cooling operation circulates, and the evaporator 92 and the vicinity thereof, particularly the downstream side of the air flow, that is, the air outlet portion of the evaporator 92 frosts early. Thereby, the through hole 104 of each side partition member 102 is closed, and the air flow downstream region 84b and the air flow upstream region 84a, 84a on the side of the evaporator 92 are completely partitioned from the outlet of the evaporator 92. All of the cool air cooled by the evaporator 92 goes to the blowout passage portion 78.

On the other hand, during the defrosting operation, the refrigeration circuit is stopped and the warm air heated by the heater 90 is sent to the evaporator 92.
As a result, defrosting in the evaporator 92 is performed, and defrosting of the frost that closes the through holes 104 of the side partition members 102 is also performed, so that the through holes 104 are opened and ventilated.
For this reason, a part of the warm air flowing through the evaporator 92 passes through the through hole 104 and flows out to the air flow upstream regions 84a and 84a on the side of the evaporator 92. Accordingly, warm air is also sent from the air flow upstream regions 84a and 84a to the suction passage portion 72, and defrosting of frost adhering to the outer periphery of the duct case 86 can be promoted. Further, similarly to the first embodiment, warm air circulates in the air flow channel 66, and the temperature rise of the storage portion 64 can be suppressed.

  By such an action, the second embodiment can achieve the same effect as the first embodiment, and with a simple configuration, while maintaining the cooling performance during the cooling operation, the removal during the defrosting operation can be achieved. The frost efficiency can be improved. Also in the second embodiment, as a modification, a mesh-like through hole may be provided as in the modification of the first embodiment, or a valve member by a thermally driven actuator that opens and closes the through hole may be provided. Absent.

Although description about embodiment of the defroster of the cooler concerning this invention is finished above, embodiment is not restricted to the said embodiment.
For example, in the above embodiment, the defroster for a cooler according to the present invention is applied to a flat showcase and a multistage showcase, but the application of the defroster for a cooler according to the present invention is applicable to other showcases. It is also possible to apply. Furthermore, the defrosting device for the cooler of the present invention is not limited to the application to the showcase, but other devices having a cooler and a defrosting means in the air flow path, such as a refrigerator or a freezer. It is also possible to apply to.

  Moreover, in the said embodiment, although partition members, such as the upper surface partition member 54 and the side partition member 102 which have the through-holes 56 and 104, are provided as some duct cases 38 and 86, the said partition member is not necessarily a duct. It is not necessary to be configured as a part of the case, and the configuration may be such that the air flow upstream side and the downstream side are partitioned from the cooler by only one partition member. For example, the configuration may be such that the upstream portions 50 and 98 and the evaporator portions 52 and 100 of the duct cases 38 and 86 in the embodiment are not provided.

In the above embodiment, circular holes or mesh-like through holes 56, 104, and 50 'are described. However, the shape of the through holes is not limited to this, and may be, for example, a long hole. .
In the first embodiment, the through hole 56 is provided only in the upper surface partition member 54a that forms the downstream portion 54 of the duct case 38. For example, the side surface partition members 54b and 54b and the side partition member 54c are provided. , 54c may be provided with through holes.

It is a longitudinal cross-sectional view of the showcase provided with the defroster of the cooler which concerns on 1st Example of this invention. It is sectional drawing which follows the AA line of FIG. It is a principal part enlarged view of FIG. It is a schematic perspective view of the duct case in 1st Example. It is a figure which shows the modification of a through-hole. It is a longitudinal cross-sectional view of the showcase provided with the defroster of the cooler which concerns on 2nd Example of this invention. It is sectional drawing which follows the BB line of FIG. It is a schematic perspective view of the duct case in 2nd Example.

Explanation of symbols

1, 1 ', 60 Showcase 2, 62 Case body 4, 6, 64 Storage part 10, 66 Air flow path 20, 22, 72 Suction passage part 36, 84 Central passage part 36a, 84a Air flow upstream area 36b, 84b Airflow downstream region 38, 86 Duct case 40, 88 Fan 42, 90 Heater (defrosting means)
44, 92 Evaporator (cooler)
48, 96 Refrigerant pipe 48a, 96a Refrigerant inflow part 48b, 96b Refrigerant outflow part 50, 98 Upstream part 52, 100 Evaporator part 54 Downstream part (partition member)
54a Upper surface partition member 54b Side surface partition member 54c, 102 Side partition member (partition member)
56, 104 Through hole

Claims (10)

A cooler which is provided in the air flow path and cools the air flow flowing through the air flow path;
A defrosting means that heats the airflow that is located on the upstream side of the airflow from the cooler in the airflow path, and that circulates in the airflow path;
A space constituted by the cooler and the air flow path wall is partitioned, and when the cooler is operated, the cool air flowing out from the air outlet of the cooler is not allowed to be returned to the upstream side of the air flow, A defrosting device for a cooler comprising: a partition member that allows warm air that has passed through the defrosting means to be recirculated to the upstream side of the airflow when the defrosting means is operated.
A defroster for a cooler comprising:   The partition member is positioned in the vicinity of the air outlet of the cooler, and the partition member has a through-hole through which an air flow can flow, and closes the through-hole when the cooler is operated, The defrosting device for a cooler according to claim 1, further comprising an opening / closing means that automatically opens and closes according to temperature so as to open the through-hole when the defrosting means is operated.   The opening / closing means closes the through-hole by frosting with cool air from the cooler during operation of the cooler, and opens the through-hole by being defrosted by warm air from the defrosting means. The defroster for a cooler according to claim 2, wherein the defroster is frost.   The defroster for a cooler according to claim 3, wherein the through hole is formed in a mesh shape. An air flow path formed inside, a blower provided in the air flow path, a cooler provided in the air flow path for cooling an air flow passing through the air flow path, and the air flow path A defrosting means for heating the airflow flowing in the air flow channel located upstream of the cooler and a blower outlet for blowing out the airflow flowing in the air flowflow on one side. It is a showcase having a storage portion formed and formed with an intake port through which at least a part of the air flow blown from the air outlet is sucked on the other side,
A space constituted by the cooler and the air flow path wall is partitioned, and when the cooler is operated, the cool air flowing out from the air outlet of the cooler is not allowed to be returned to the upstream side of the air flow, A showcase comprising a partition member that allows warm air that has passed through the defrosting means to be recirculated to the upstream side of the airflow when the defrosting means is operated.   The partition member is positioned in the vicinity of the air outlet of the cooler, and the partition member has a through-hole through which an air flow can flow, and closes the through-hole when the cooler is operated, 6. The showcase according to claim 5, further comprising opening / closing means that automatically opens and closes according to temperature so as to open the through-hole when the defrosting means is operated.   The opening / closing means closes the through-hole by frosting with cool air from the cooler during operation of the cooler, and opens the through-hole by being defrosted by warm air from the defrosting means. The showcase according to claim 6, wherein the showcase is frost.   The showcase according to claim 7, wherein the through hole is formed in a mesh shape. The showcase is a flat showcase in which the housing portion opens upward,
The cooler is disposed in the air flow path formed in the lower part of the showcase,
The showcase according to any one of claims 5 to 8, wherein the partition member is arranged to extend from at least an upper side surface of the cooler to an upper wall of the air flow path. The showcase is a multistage showcase in which the housing portion opens forward,
The cooler is disposed in an air flow path formed on the back surface of the showcase,
The showcase according to any one of claims 5 to 8, wherein the partition member is disposed to extend from a side surface of the cooler to a side wall of the air flow path.

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