JP2957909B2 - Showcase cooling method and cooling device, and showcase - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is a method of cooling Shoke <br/> over scan for food displaying and cooling apparatus and showcases scan the <br/> relates, in particular, or refrigerated refrigeration are installed in large stores It relates to a cooling method and cooling apparatus, and showcases scan suitable showcases scan for cooling use showcase.

[0002]

2. Description of the Related Art In recent years, the size of stores has been increasing due to the relaxation of the large store method. In the food industry, frozen foods and chilled foods have been increasing. Along with this, showcases for displaying frozen foods and showcases for refrigerated foods (hereinafter referred to as “showcases” unless otherwise specified, collectively refer to these frozen and refrigerated showcases) occupy the sales floor area of the store. The proportion is also increasing.

[0003] In these showcases, food is frozen or refrigerated by cooling air cooled by a cooling unit constituting a refrigeration cycle. This cooling unit connects various devices constituting a refrigeration cycle consisting of a compressor, a condenser, an expansion member, and an evaporator with piping for circulating the refrigerant, and a fan connects the refrigerant in the evaporator to a surrounding medium to be cooled. Heat exchange is performed to cool the medium to be cooled.

[0004] Here, the cooling unit will be briefly described.

[0005] First, a refrigerant is sucked into a compressor and compressed, so as to be in a state of high temperature and high pressure. The high-temperature and high-pressure refrigerant is passed through a condenser such as a capillary tube, and exchanges heat with the outside air to release heat from the refrigerant to liquefy the refrigerant. The liquid refrigerant is adiabatically expanded in an expansion member such as an expansion valve to a low-temperature and low-pressure liquid state.The low-temperature and low-pressure liquid refrigerant passes through the evaporator, and the refrigerant is heated by the medium to be cooled passing around the evaporator. In this way, the medium to be cooled is cooled and the refrigerant is vaporized to return to the original vaporized state. Then, the process of sucking the refrigerant into the compressor again is repeated to cool the medium to be cooled.

Next, a conventional showcase cooling device will be described.

[0007] Each conventional showcase placed in a store has the above-described expansion member, evaporator, fan and various control devices inside. On the other hand, the compressor is disposed in a machine room provided outside the store together with a motor for driving the compressor, and the condenser is disposed in a well-ventilated place such as a rooftop. The compressor and the condenser, the expansion member in each showcase, and the evaporator were connected by a plurality of pipes (refrigerant pipes) for circulating the refrigerant.

In order to connect the compressor to devices in a plurality of showcases, a plurality of pipes must be connected so that refrigerant does not leak so as to branch from the compressor side to each of the showcases. However, the connecting means of the pipe made of the copper pipe has been connected by welding adjacent pipes or connected by connecting members such as screws. In addition, the outer periphery of each pipe was covered with a heat insulating member.

In the conventional showcase cooling apparatus, the high-temperature and high-pressure refrigerant sent from the cooling unit disposed in the machine room through the pipe is supplied to the evaporator in the showcase at the product display portion of the showcase. By exchanging heat with air, the product display section of the showcase was cooled.

[0010]

The surface temperature of an evaporator that is installed in a showcase and exchanges heat with air in a product display section of the showcase is generally below freezing point.
Frost will adhere to the surface of the evaporator. For this reason,
Defrosting work called defrost has been performed about once every 3 to 4 hours. This defrost removes the frost on the evaporator by temporarily suspending the cooling of the showcase, and therefore, conventionally, each showcase is provided with the drain water generated as a result of the defrost. Drainage pipes for removal had to be installed one by one.

In order to install the showcase, in addition to the refrigerant piping work and the heat insulating member covering work as described above, a drainage pipe work for providing a drainage pipe near each showcase and a power supply for supplying power to the equipment of each showcase are provided. Large-scale construction such as electrical work was necessary, and once the showcase was installed, it was difficult to move the showcase significantly due to securing drainage pipes and electrical wiring, etc. In order to do so, large-scale construction was required, and the cost was actually high.

Further, in the construction of the refrigerant pipe, when the connection of the pipe is performed by welding, an excessive load is applied to a connecting portion by some external impact, and the pipe is damaged. Even if it is performed, the screw will loosen due to the contraction of the copper pipe due to temperature change,
The refrigerant made of Freon gas sometimes leaked, but since this leak of Freon gas causes destruction of the ozone layer,
It was a serious environmental problem. On the other hand, the number of connection points of the pipes increases as the number of showcases increases, and the possibility of refrigerant leakage increases, so that maintenance is complicated.

Further, as described above, when defrosting is performed to remove frost from the evaporator, the temperature inside the showcase is unavoidably increased by 10 to 15 ° C., but is kept in a chilled state by cooling. Among the fresh foods, there is a problem in quality control of frozen or refrigerated foods, such as a state in which juice called so-called drip exudes to meat and fresh fish. Further, when a failure occurs in each of the devices arranged in the showcase, repair work in the store is inevitable, so that business support may be required.

On the other hand, the vending machines in which a large number of vending machines are installed nationwide also have a built-in cooling unit. Therefore, if a plurality of vending machines are installed in the same place, Problems similar to the problems in the showcase that had occurred.

[0015] For example, in a conventional open showcase, a so-called cold aisle occurs in which cooling air in the showcase flows out of the showcase (inside the store) from a product take-out opening which is largely open to the front of the showcase. The cooling efficiency was remarkably poor. Further, the shopper may feel cold when passing in front of the showcase or when shopping for goods.

[0016] The present invention overcomes the problems of the prior art described above, the running cost, the initial cost is inexpensive, yet can be effectively utilized inside the main body of the showcases scan for commodity storage, cooling efficiency to improve and to provide a cooling method and cooling apparatus, and showcases scan of showcases scan capable.

[0017]

According to a first aspect of the present invention, there is provided a method of cooling a showcase, comprising the steps of: providing a cooling unit with cooling air cooled to a temperature lower than a set temperature of the showcase; The cooling air is supplied to the supply air passage in the showcase as a cooling source through a supply pipe, mixed with the air in the showcase to cool the showcase, and the amount of the cooling air supplied to the showcase as a cooling source. The same amount of air in the collection air passage in the showcase as in the showcase is collected in the cooling unit via the collection pipe, and the collected air is re-cooled in the cooling unit and used again as cooling air. A supply passage including a supply pipe and a supply air passage for the cooling air in accordance with a temperature in the showcase; The automatic ventilation control means provided in the collecting pipe and the collecting passage including the collecting air passage is controlled so that the supply amount and the collecting amount of the cooling air are slightly larger than the cooling air supply amount. It is characterized in that it is adjusted in proportion to. A cooling device for a showcase according to claim 2, wherein a plurality of showcases each having a cooling air outlet communicating with a supply air passage and a cooling air suction opening communicating with a recovery air passage are separated from each showcase. is installed, the compressor, condenser, expansion member and have a evaporator refrigeration cycle for cooling the brine to be circulated, this
Cold storage that cools the brine cooled by the refrigerating cycle and has a heat exchanger into which the brine in the cold storage tank is introduced to exchange heat with air to generate cool air for cooling each showcase A cooling unit comprising a cooling chamber, a supply pipe for supplying cooling air produced in the cooling air generation chamber of the cooling unit from a cooling air outlet of each of the showcases, and a cooling air for each of the showcases A collection pipe for collecting the cooling air in the cooling unit in order to pass the cooling air from the suction port to the heat exchanger in the cold air generation chamber.The supply pipe and the collection pipe have a predetermined amount of supply cold air or collection cold air in advance. Opening and closing means that can adjust the opening of each pipe to set it,
A supply passage including the supply pipe of the cooling air corresponding to each showcase and a supply air passage in the showcase and a collection passage including the collection pipe of the cooling air corresponding to each showcase and the collection air passage of the showcase, At least one air flow rate can be automatically controlled by a temperature control means disposed in the showcase in order to proportionally control the flow of the cool air so that the recovery amount of the cool air is slightly larger than the supply amount of the cool air. It is characterized in that two automatic ventilation adjusting means are provided. The cooling device for a showcase according to claim 3 is the cooling device for a showcase according to claim 2, wherein the automatic ventilation control means is provided in a supply pipe and a recovery pipe for the cooling air, and the temperature control means is provided. The opening degree is automatically adjusted through a step motor driven by the automatic opening control valve. A cooling device for a showcase according to a fourth aspect is the cooling device for a showcase according to the second aspect, wherein the automatic ventilation control means is a fan that is inverter-controlled by the temperature control means. . The showcase according to claim 5, wherein a product display portion for displaying products to be cooled, an opening of a supply air passage communicating with the product display portion and supplying cooling air from the outside to the product display portion, A collection port of a collection air passage which communicates with the product display section and collects cooling air to the outside from the product display section; and the product display section has temperature control means for controlling the temperature of the product display section. In the supply air passage and the recovery air passage, the supply amount of the cooling air used for cooling the product display unit and the recovery amount of the cooling air used for cooling are controlled in accordance with the temperature in the product display unit. It is characterized by having a ventilation automatic adjusting means for proportionally adjusting the recovery amount of the cooling air so as to be slightly larger than the supply amount of the cooling air. The showcase according to claim 6 is the showcase according to claim 5, wherein the showcase is an open showcase. Claim 7
The showcase according to claim 5, wherein the showcase is a closed showcase. The showcase according to claim 8 is the showcase according to claim 5, wherein the showcase is a reach-in showcase.

[0018]

According to the cooling method and the cooling device of the present invention, the cooling air of each showcase is introduced into the cooling unit through the recovery pipe to exchange heat with the refrigerant in the evaporator or the brine in the heat exchanger. When the cooling air is supplied to each showcase through a supply pipe, the temperature control means disposed in each of the showcases controls the automatic ventilation control means so that the cooling air supply amount and The temperature of each showcase was controlled by adjusting the amount of collection so as to be proportional to each other.Therefore, without installing equipment that composes a refrigeration cycle in each showcase, The displayed food can always be cooled and stored at a constant temperature.

[0019]

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 schematically shows a showcase cooling apparatus according to the present invention. A plurality of showcases 1 are installed in a store S such as a supermarket.
FIG. 1 shows only one representative showcase 1. This showcase 1 is, as shown in detail in FIG.
A part of the front surface is formed in a box shape that is widely opened as a product outlet 2, and a product display unit 3 is formed in the product outlet 2 of the showcase 1 so as to communicate with the product outlet 2. ing. A plurality of detachable shelves 4, 4... Are arranged at an interval in the vertical direction in the product display section 3, and a box-shaped product storage section is provided at the lower end of the product display section 3. 5 are formed. The showcase 1 is not provided with a conventional condenser, expansion member, evaporator, etc., and is not connected to a drain pipe for collecting drain water. Further, the product display section 3 of the showcase 1 is not limited to the configuration shown in FIG.

The merchandise display section 3 of the showcase 1
A cooling air passage 6 formed in a U-shape along the upper surface, the back surface, and the lower surface of the product display portion 3 is provided on the back side of the product display portion 3. 7a of the supply pipe 7 for supplying the oil to the showcase 1
Is connected so as to penetrate the back surface of the showcase 1. The distal end portion 7a is provided with a cold air blowing duct 8 formed into a tubular shape by a heat insulating member as shown in FIG.
9 so that they are arranged horizontally in the width direction of the showcase 1.
It is bent at 0 degrees and connected. The cool air outlet duct 8
Has a plurality of cold air outlets 9, 9,... Formed so as to blow upward the cool air supplied from the supply pipe 7 above the heat insulating member formed in a cylindrical shape.

Returning to FIG. 2, the upper end of the cooling air passage 6 is opened in front of the commodity display portion 3 and has a cooling air outlet 10 for blowing the cooling air in the cooling air passage 6 downward.
A front end connected to the lower end of the cooling air passage 6 is formed as a cooling air suction port 11 that opens to the front of the commodity display section 3 and sucks the cooling air in the cooling air passage 6. A partition plate 12 is formed on the side of the cooling air suction port 11 from the position where the cooling air blowing duct 8 is connected to the distal end portion 12a of the cooling air supply pipe 7 of the cooling air passage 6. The partition plate 12 is provided with a fan 13 for communicating the cooling air passage 6.

The fan 1 in the cooling air passage 6
3 and an intermediate portion between the disposition positions of the distal end portion 7a of the supply pipe 7,
A distal end 14 a of a collection pipe 14 for collecting cooling air in the showcase 1 is connected so as to penetrate a back surface of the showcase 1. And the tip portion 14a
In the same manner as the cold air blow-out duct 8 , a cold air recovery duct (not shown) molded into a cylindrical shape by a heat insulating member is connected by being bent 90 degrees so as to be horizontally disposed in the width direction of the showcase 1. ing. This cool air collecting duct has a plurality of suction holes for sucking air in the showcase 1 collected in the cooling air passage 6 by the fan 13 below a heat insulating member formed in a cylindrical shape. . It is assumed that the arrangement area of the suction holes is equal to the total arrangement area of the cool air discharge holes 9 provided in the cool air discharge duct 8.

The cooling air passage 6 of the showcase 1
A guide air passage 15 which is also formed in a U-shape along the cooling air passage 6 is disposed at a back portion of the cooling air passage 6, and an upper end of the guide air passage 15 is provided in front of the cooling air outlet 10. A guide air outlet 16 that opens to the side and blows out the air in the guide air passage 15 downward, and a front end connected to a lower end of the guide air passage 15 is located adjacent to the front of the cooling air inlet 11. The opening is a guide air suction port 17 for sucking the air in the product display section 3. Also,
In the vicinity of the guide air suction port 17 in the guide air passage 15, a fan 18 for circulating the guide air is provided.
9 so as to be supported. The guide air passage 15 may not be provided depending on the type of the showcase 1.

An external air passage 20 is provided above the guide air passage 15 serving as an upper end portion in the showcase 1. One end of the external air passage 20 is located in front of the guide air outlet 16. An external air outlet 21 that opens to the side and blows out the external air supplied to the external air passage 20 downward.
A fan 22 that takes in external air into the external air passage 20 is provided on the rear side of the top plate of the showcase 1 that forms the upper surface of the external air passage 20.

At the uppermost portion of the back of the product display section 3 of the showcase 1, a detection section 23 of a thermostat T as temperature control means for controlling and controlling the temperature in the product display section 3 is provided. .

In the supply pipe 7 and the recovery pipe 14,
A manual opening / closing valve for measuring the internal pressure in the supply pipe 7 and the recovery pipe 14 before starting the first operation, and adjusting the opening thereof so that the supply cooling air amount and the recovery air amount become substantially equal. 24, and an automatic opening control valve 25 as an automatic ventilation control means whose opening is automatically adjusted by a step motor SM electrically connected to the thermostat T disposed in the showcase 1. It is arranged. The automatic opening control valve 25 is a proportional-type temperature control means. In order to keep the temperature inside the showcase 1 constant,
The temperature in the showcase 1 is always compared with an arbitrary set temperature by using the thermostat T. As a result, the step motor SM balances the quantity of cooling air supplied and the quantity of recovered air. As shown, the opening is adjusted in accordance with the temperature in the showcase 1. That is, the automatic opening control valve 25 disposed in the supply pipe 7 and the recovery pipe 14 is configured such that the temperature in the showcase 1 detected by the detection unit 23 of the thermostat T disposed in the showcase 1 is lower than the set temperature. When it rises, the automatic opening control valve 2 of the supply pipe 7 and the recovery pipe 14
When the temperature detected by the thermostat T falls somewhat from the set temperature, the automatic opening control valve 25 of the supply pipe 7 and the recovery pipe 14 is opened. It is controlled to close so as to make it smaller.

The opening degree of the automatic opening control valve 25 is as follows.
It is not always necessary that the supply pipe 7 side and the recovery pipe 14 side be the same, and in this embodiment, the opening automatic adjustment valve 25 is the opening degree of the opening automatic adjustment valve 25 provided on the supply pipe 7 side. Thus, the opening degree of the automatic opening control valve 25 provided on the collection pipe 14 side is increased so that the amount of cooling air to be collected is slightly larger than the amount of cooling air to be supplied to the showcase 1. In this embodiment, the amount is increased by about 5%, but is not limited to this percentage.

The functions of the manual on-off valve 24 and the automatic opening control valve 25 can be combined into one valve. Further, the manual opening / closing valve 24 and the automatic opening control valve 25 may be provided in the supply air passage 6a and the collection air passage 6b in the showcase 1.

The structure of the automatic opening control valve 25 will be described in detail when the structures of the supply pipe 7 and the recovery pipe 14 are described.

Returning to FIG. 1, a cooling unit 26 for cooling the product storage section 5 of each of the showcases 1 is provided in a machine room M which is separated from the store S in which each of the showcases 1 is installed. Is installed.

FIG. 4 schematically shows the cooling unit 26.

The cooling unit 26 includes a casing 28 containing a refrigeration cycle 27 including a compressor, a condenser, an expansion member, and an evaporator,
Storage tank 29 for keeping the brine cooled by cooling
And a cool air generation chamber 31 that generates cooling air by performing heat exchange between the brine circulating in the heat exchanger 30 and the surrounding medium to be cooled. The condenser of the refrigeration cycle 27 can be separately provided on a roof or the like as a cooling tower or the like.

The compressor, condenser, expansion member and evaporator which constitute the refrigeration cycle 27 are connected by two pipes (not shown) for circulating the refrigerant, and the refrigeration cycle 27 is connected to the regenerative member 32. Cold storage tank 2 to be installed
9 and two pipes P1 and P for circulating brine.
1, and the regenerator tank 29 is connected to each heat exchanger 30 in the cool air generation chamber 31 by two pipes P2 and P2 for circulating brine. The brine is circulated between the casing 28 , the cold storage tank 29, and the cold air generation chamber 31 by a pump (not shown).

Here, each component of the cooling unit 26 will be further described.

First, in order to cool the brine, which is a cooling refrigerant, using the refrigeration cycle 27, the brine is contacted with the evaporator of the refrigeration cycle 27 to exchange heat in the casing 28 , though not shown. It is configured. In the present embodiment, as the brine, it is preferable to use a calcium chloride solution having a property that viscosity is hardly produced, or it is preferable to use an ethylene glycol solution. In this embodiment, a case where a calcium chloride solution is used will be described. .

A regenerator 29 is connected to the refrigerating cycle 27 with two pipes P1 and P1 for circulating brine.
For example, a plurality of regenerators 33, 33 containing ethylene glycol or calcium chloride mixed with water and frozen at a slightly higher temperature (-25 ° C to -30 ° C) than the cooled calcium chloride solution, They are arranged in a line. The direction in which the cold storage containers 33 are arranged is parallel to the opposed wall surfaces 29a, 29a of the cold storage tank 29 to which the pipes P1, P2 are connected, in order to facilitate the flow of the brine between the casing 28, the cold storage tank 29, and the cold air generation chamber 31. Direction. In addition, as the brine, there are polypropylene glycol, sodium chloride, magnesium chloride and the like in addition to the calcium chloride and ethylene glycol.

The heat storage tank 29 has two pipes P2 and P2 for circulating brine.
Is connected to each of the pipes P2.
The on-off valve 35 which is automatically opened and closed by a motor (not shown) connected to the thermostat T disposed inside the thermostat T
And a pump 36 for circulating the cooled brine in the cold storage tank 29. The on-off valve 35 and the pump 36 disposed in the pipe P2
When the temperature of the generated cold air detected by the thermostat T disposed in the pipe 4 rises above the upper limit set temperature, the on / off valve 35 of the pipe P2 is opened and the pump starts to be driven. When the temperature is detected, the on-off valve 35 of the pipe P2 is closed and the pump 36 is closed.
Is stopped.

In this embodiment, as shown in FIG. 5, two heat exchange chambers 3 each having a cooling fin coil for circulating the brine are provided in the cold air generating chamber 31.
7, 37 are provided. Then, the cold air collecting chamber 3 is located adjacent to the heat exchange chambers 37 via a partition 38.
A fan 3 for circulating cool air is provided in a partition 38 between the heat exchange chambers 37, 37 and the cool air collecting chamber 34.
9 are formed. As shown in FIG. 6, the fan 39 is disposed above the partition wall 38 in the cold air generating chamber 31 and is capable of remotely operating the heat exchange chamber 37 and the cold air collecting chamber 34 so as to be able to shut off any ventilation. Shutter 40 that can be opened and closed
have.

The cool air generated in the heat exchange chambers 37, 37 is collected in the cool air collection chamber 34 by driving a fan 39 disposed in a partition 38 between the heat exchange chambers 37, 37 and the cool air collection chamber 34. Can be

Although it is of course possible to perform the cooling operation in the two heat exchange chambers 37 and 37 at the same time, in the present embodiment, the heat exchanger 3 of one of the heat exchange chambers 37 is used.
0 is used to cool the air, and the other heat exchange chamber 37 is used.
The two heat exchange chambers 37, 37 are alternately used in such a manner that maintenance such as defrosting of the heat exchanger 30 is performed as necessary or a standby state is prepared for an emergency.

During the defrosting, the shutter 40 provided on the fan 39 disposed in the partition 38 between the heat exchange chamber 37 and the cold air collecting chamber 34 in which the defrosting is performed is closed, so that the defrosting is performed. In this case, it is possible to prevent the warm air generated at this time from entering the cool air collecting chamber 34.

As shown in FIG. 5, a pipe P2 for circulating brine through the heat exchanger 30 is connected to a pipe P3 for supplying and recovering hot brine separately provided for defrost. The defrosting is performed by opening and closing the defrosting valve 41 interposed in the apparatus. In the pipe P3, the calcium chloride solution as the brine is sealed, and the brine in the pipe P3 is connected to a coil through which a high-temperature and high-pressure refrigerant gas before reaching the condenser in the refrigeration cycle 27 is heated. The hot brine is maintained at a temperature of about 40 ° C. by exchanging heat with the refrigerant gas. Note that the temperature control of the hot brine is achieved by providing a bypass in the pipe P3 and performing heat treatment with the refrigerant gas as needed. Instead of the defrost valve 41, a three-way valve combining the defrost valve 41 and the manual open / close valve 24 may be used.

Further, the cooling air which is cooled by heat exchange with the brine in the heat exchange chamber 37 in the cold air generating chamber 31 and is introduced into the cold air collecting chamber 34 is supplied to the product display section 3 of each of the showcases 1. Supply pipe 7 is connected to a cool air collection chamber 34 of the cooling unit 26,
The distal end 7a of the supply pipe 7 communicates with the cooling air passage 6 of each showcase 1 as described above.

An air flow sensor 42 is provided in the supply pipe 7 in the vicinity of the cold air collection chamber 34, and when the supply of cooling air falls below a set value, the air flow sensor 42 The drive of the motor M of the fan 43 which is installed in the collection chamber 34 and sends the cooling air to the supply pipe 7 is inverter-controlled to prevent the motor M of the fan 43 from being overloaded.

Further, the collection pipe 14 communicating with the product storage section 5 of each of the showcases 1 is connected to the cold air generation chamber 31.
The cooling air of each showcase 1 is collected in the cooling air generating chamber 31 of the cooling unit 26. The cooling air collected through the recovery pipe 14 is distributed to the two heat exchange chambers 37 by operating a switching valve disposed in the recovery pipe 14, for example. Thus, in order to circulate the cooling air between the cooling unit 26 and each showcase 1 via the supply pipe 7 and the recovery pipe 14, the cooling unit 26 includes a supply unit (not shown) other than the fan 39. In addition, a large capacity fan for recovery is provided.

The peripheral wall 44 of the cold air generating chamber 31 is formed of a heat insulating panel, and the ceiling 45 has
As shown in FIG. 7, a ceramic plate 45a for preventing frost formation is adhered to the surface. When cold air is applied to the ceramic plate 45a, the ceramic of the ceramic plate 45a has the property of preventing the development of ice crystals contained in the cold air, so that frost formation on the ceiling 45 can be prevented. it can. On the ceiling 45 of the cool air collecting chamber 34, a wind hitting plate 46 on which the ceramic plate 45a is stuck is disposed in an inclined manner, and the wind hitting plate 46 is attached to a partition 38 in the cold air generating chamber 31.
Is directly received by the cool air blown out from the fan 39 disposed in the air conditioner. By doing so, it is possible to prevent frost from forming on each part other than the ceiling inside and outside the cold air collecting chamber 34.

In the cool air collecting chamber 34, as described above, a thermostat T for detecting the temperature of the generated cool air and controlling the opening and closing of the on-off valve 35 and the driving of the pump 36 provided in the pipe P2 is provided. Has been established.

Returning to FIG. 1, the cooling unit 2
A supply pipe 7 for supplying cooling air cooled by heat exchange with the refrigerant in the evaporator in the evaporator 6 to the product storage section 5 of each showcase 1 is connected to the cooling unit 26. Each end of the pipe 7 communicates with the cooling air passage 6 of each showcase 1 as described above.
Furthermore, a collection pipe 14 communicating with the cooling air passage 6 of each showcase 1 is connected to the cooling unit 26, and the air in the cooling air passage 6 of each showcase 1 is collected by the cooling unit 26. It has become.

The supply pipe 7 and the recovery pipe 14 are configured by sequentially connecting a large number of heat-insulating air conduits 47. As shown in FIG. 7, the heat-insulating wind conduit 47 has a wind-conducting body 48 formed of a heat-insulating material in a cylindrical shape. A cylindrical connecting member 50 made of vinyl chloride or other resin is formed on the inner peripheral edge of one end of the wind duct main body 48 in order to reduce air resistance. It is formed so as to be connected to the core body 49. Then, a pair of adjacent insulated air conduits 47, 47
Of the supply pipe 7 and the recovery pipe 14 by connecting the ends of the
Is formed. It is desirable that the connecting portions on the outer periphery of the pair of adjacent heat-insulating air conduits 47 be sealed with an aluminum tape (not shown). In addition, as an example of the wind conduit body 48, a length of 1 to 2 m, an inner diameter of 50 to 600 cm, a thickness of about 30 to 75 mm, desirably 50 to 75 mm can be considered. The main pipe on the cooling unit 26 side differs from the branch pipe on the showcase 1 side. The wind conduit body 48
It is desirable that the lower the cold air temperature is, the thicker it is.

On the other hand, the supply pipe 7 and the recovery pipe 14
In the branching portion or the collecting portion, a T-shaped tubular insulated air conduit 47A as shown in FIG.
A tube, a Y tube, or the like may be used. This insulated wind conduit 47A and other shaped wind conduits are similar to the insulated wind conduit 47 described above.
It has a wind conduit body 48A in which a heat insulating material is formed in a cylindrical shape, and a core body 49A is formed on the inner periphery of the central part similarly to the wind conduit (straight pipe) shown in FIG. The heat-insulating air conduit 47A is also connected to the other heat-insulating air conduits 47 and 47A by bonding a connecting member 50A such as the connecting member 50.

The connecting members 50 are attached to all three ends of the heat-insulating wind conduit 47A shown in FIG. 4, but the heat-insulating wind conduit 47A is connected to the connecting members 50 of the other heat-insulating wind conduits 47, 47A. Are not connected. Needless to say, the connecting members 50 do not necessarily need to be provided at all three ends of the heat-insulating air conduit 47A.

The cooling air produced by the cooling unit 26 is circulated between the cooling unit 26 arranged in the machine room M and the showcase 1 arranged in the store S, and Supply pipe 7 for supplying to case 1
Then, the piping work of the collecting pipe 14 for collecting the frozen air from the showcase 1 is performed. This operation is performed by connecting the connecting member 50 of the insulating wind conduits 47 and 47A to the adjacent insulating wind conduit 4.
7, 47A are inserted into the ends of the air duct main bodies 48, 48A, and the connecting member 50 is glued to the heat insulating air ducts 47, 47A.
A by bonding with A.
The connecting portion of 7, 47A is sealed with an aluminum tape for reinforcement. The insulated air conduits 47 and 47A are provided in places that are not easily seen by the public, such as the inside of the ceiling, and do not hinder the walking of the shopper or the carrying in of goods.

In this embodiment, the heat-insulating air conduit 47 using a metal member such as stainless steel as the core 49 is
Since there is a risk of dew condensation, it shall not be used for supply piping at all.

FIG. 9 is a perspective view showing the automatic opening control valve 25, FIG. 10 is a sectional view taken along the line a--a in FIG.
1 is a sectional view taken along the line bb in FIG. 10, and FIG. 12 is a transverse sectional view of FIG.

The valve body 51 of the automatic opening control valve 25 is
The valve body 51 is attached to the heat-insulating wind conduit 47 and
Inside, a circular valve plate 52 that closes off the heat-insulating air conduit 47 and allows the ventilation to be shut off is disposed rotatably in the horizontal direction around an insulation shaft (heat-insulating shaft) 53 described later. A semicircular valve seat 54 is provided on the inner peripheral portion of the heat-insulating air conduit 47 provided with the valve plate 52, as shown in FIG. It is arranged so as to contact the peripheral portion from one side of the valve plate 52 and to contact the remaining semicircular portion from the other surface side of the valve plate 52. This semicircular valve seat 54
Functions as a stopper when the valve plate 52 is opened most, that is, when the rotation of the valve plate 52 is set to approximately 90 degrees, and when the valve plate 52 is closed, it comes into contact with the circumferential portion of the valve plate 52 and In addition to blocking ventilation from around the periphery of the valve case 52, it functions as a sealing member for preventing the valve plate 52 from freezing in a closed state due to cooling air supplied to the showcase 1.

The insulation shaft 53
Extends upward from the upper end of the valve plate 52 and extends
The rotation shaft 55 of the step motor SM is connected to the upper end of the insulation shaft 53. As described above, the opening degree of the valve plate 52 is adjusted by driving the step motor SM. In addition, the insulation shaft 53
The rotary shaft 55 is accommodated in a motor mounting table 56 having a substantially rectangular cross section and formed of a heat insulating member integrally formed above the main body 51.

The heat-insulating air conduit 47 is divided into upper and lower halves at the portion where the automatic opening control valve 25 is installed, and the valve plate 52 of the automatic opening control valve 25 is connected to the heat-insulating air conduit 47. After being installed in the inside, the heat-insulated air conduit 47 split in half is bonded to form an annular shape.

In the vicinity of the motor mounting table 56, a small-diameter hole facing the center of the air duct 47 is formed as an airflow measuring port 57, and the airflow is measured from the airflow measuring port 57 before the first operation. The meter is inserted into the wind conduit 47 to detect the air volume and the wind speed. Then, based on the detection result, the opening degree of the manual opening / closing valve 24 disposed in the wind conduit 47 is manually adjusted to obtain an appropriate supply / recovery amount of cool air. In addition, this air volume measurement port 5
7, once the manual on-off valve 24 is properly set,
Normally, it is closed with an appropriate plug 58.

It should be noted that various components such as the insulation shaft of the air volume adjusting damper constituting the automatic opening control valve 25 are also formed of a heat insulating material such as urethane or polyester having a low thermal conductivity.

Next, the operation of the present embodiment having the above-described configuration will be described.

First, a low-temperature and low-pressure liquid refrigerant is supplied to an evaporator (not shown) in a refrigeration cycle 27 in a cooling unit 26, and is brought into contact with brine. Cool to 40 ° C. Then, the cooled brine is circulated through the pipe P1 to the regenerator 29, and the cooled brine is recirculated to the regenerator 29.
Keep cool.

In the cold storage tank 29, -30 ° C. to -40
The cold storage container 33 in which the mixture of ethylene glycol and water adjusted to freeze at -25 ° C. to -30 ° C. slightly higher than the calcium chloride solution is frozen by the calcium chloride solution cooled to 0 ° C. In the case where the degree of cooling of the calcium chloride solution is somewhat loosened due to circulating use as brine, the cold storage container 33 functions as a cold storage member 32 for cooling the calcium chloride solution. Therefore, the refrigeration cycle 2
7 does not need to be constantly driven. That is, the refrigeration cycle 27 is driven to cool the calcium chloride solution only when the calcium chloride solution has reached a temperature at which cooling air at a predetermined temperature cannot be generated in the cold air generation chamber 31, and the calcium chloride solution is connected to the pipe P2. The on-off valve 50 is opened and closed to circulate the calcium chloride solution. Therefore, cold storage containers 3 can be made using inexpensive midnight power.
The mixed solution of ethylene glycol and water in 3 is frozen, and the refrigeration cycle 27 may be driven only in the daytime when the brine temperature is lower than the set temperature.

Further, a plurality of types of brines having different freezing temperatures are sealed in the regenerative storage container 33 for each of the plurality of regenerative storage containers 33 and used as the regenerative storage member 32. In this case, since a plurality of types of melting temperatures of the cold storage member 32 are obtained, a time difference occurs at the time of melting in which a large amount of heat is taken from the calcium chloride solution, and therefore, the cooling of the calcium chloride solution is stabilized for a long time. Can be done

In the present embodiment, the calcium chloride solution can be changed with another brine, for example, ethylene glycol, and the mixed solution of ethylene glycol and water can be changed with another brine, for example, a mixed solution of calcium solution and water. Is as described above.

The cooling air from each showcase 1 collected in the cool air collecting chamber 34 of the cooling unit 26 via the collecting pipe 14 is cooled by a cooling air ( not shown) in the cool air generating chamber 31.
Further cooling is performed by exchanging heat with the brine passing through the cooling fin coil , and the cooling water is supplied into the supply pipe 7 by a fan (not shown) provided in the cooling unit 26.
The cooling air supplied into the supply pipe 7 passes through the supply pipe 7, and is uniformly blown into the cooling air passage 6 from a cool air blowing duct 8 connected to a tip 7 a of the cooling air. Then, the cooling air is mixed with the cooling air in the showcase 1 sucked by the fan 25 in the cooling air passage 6 and further cooled.
10 is blown out to the product display unit 3 . Each cooling
Since the air outlet 10 is provided in the upper part of the front of the showcase 1, the cooled air is supplied to the product display of the showcase 1.
The merchandise display unit 3 and the merchandise will be cooled down from the upper part of the row part 3 to the lower part . Then, the air provided for cooling is drawn into the collection pipe 14 from the cooling air suction port 11 provided in the product storage unit 5 of the showcase 1 by the suction force of another fan provided in the cooling unit 26, and collected. It is returned to the cooling unit 26 again through the pipe 14 .

As described above, the cooling air is supplied to the cooling unit 26.
To each showcase 1, the cooling unit 26, the supply air passage 6a of each showcase 1, and the supply piping.
The products are supplied by passing through a supply passage made of 7 and cool the products in the product display section 5 of each showcase 1 to a predetermined temperature.

On the other hand, the air provided for cooling is sucked into the cooling air passage 6 from the cooling air suction port 11 provided on the front lower wall of the commodity display section 3 by the fan 25, and It is mixed with the cooling air sent from the supply pipe 7 and is used again as the cooling air. That is, the air provided for cooling is collected from each showcase 1 to the cooling unit 26 through the respective showcases 1 and the collecting air passage 6b of the cooling unit 26 and the collecting passage composed of the collecting pipe 14, and is collected again. , Used as cooling air.

Further, the product display section 3 of the showcase 1
Guide the air outlet 16 and an outer, which are provided at the front on the wall of the
From the air / air outlet 21 , guide air and outside air are blown out as an air curtain that ensures the balance between the pressure of the cooling air and the outside air. The guide air and the surrounding semi-cooled air are sucked into the guide air passage 15 from the guide air suction port 28 provided in the front lower wall 8 of the product display section 3 by the fan 18, and pass through the guide air passage 15. The air is again supplied as guide air from the guide air outlet 16.

Further, the refrigeration cycle 27 in the cooling unit 26 is driven to cool the inside of the showcase 1, and once the temperature in the showcase 1 drops to the set temperature,
A step motor SM of each automatic opening control valve 25 connected to a thermostat T for controlling the temperature inside the showcase 1 which is disposed in the supply pipe 7 and the recovery pipe 14 is driven. By rotating the valve plate 52 in the closing direction, the opening of the automatic opening control valve 25 is reduced, the amount of cool air supplied from the adiabatic air conduit 47 is reduced, and the cool air is collected from the showcase 1. Reduce the amount of cold air.

When the temperature inside the showcase 1 rises above the set temperature, the stepping motor SM connected to the thermostat T for controlling the temperature inside the showcase 1 is driven, so that the supply pipe 7 and the Valve plate 52 of each automatic opening control valve 25 disposed in the collection pipe 14
Is opened so as to increase its opening degree, thereby increasing the amount of cool air supplied from the heat-insulating air conduit 47, supplying a larger amount of cool air into the showcase 1 and collecting the cool air from the showcase 1. Increase the amount of cold air.

The thermostat T is controlled so as to operate when the difference between the set temperature and the actual temperature becomes ± 1 ° C. as an example, and is disposed in the supply pipe 7 and the recovery pipe 14. The opening degree of the automatic opening control valve 25 is controlled so as to be proportional to each other according to the temperature inside the showcase 1 controlled by the thermostat T. In addition, on / off control for completely opening and closing the double opening automatic control valve 25 is also possible.

By the way, in this embodiment, the opening degree of the automatic opening control valve 25 disposed on the recovery pipe 14 side is smaller than the opening degree of the valve plate 52 of the automatic opening control valve 25 disposed on the supply pipe 7 side. The opening degree of the valve plate 52 is controlled to be large so that the amount of cooling air recovered from the showcase 1 is increased by about 5% from the amount of cooling air supplied to the showcase 1. Showcase 1 as a result of more collection
From the product outlet 2 part formed in the open state on the front of
There is an effect that the cooling air in the showcase 1 does not leak outside (inside the store). This eliminates the low-temperature cold air remaining in the passage in front of the showcase 1,
This means that customers and clerks will not be damaged by the low temperature, and the so-called cold aisle problem will be solved.

It should be noted that there is also a difference in the desired cooling temperature from the viewpoint of food management. When the showcase 1 is used as a freezer, the temperature is preferably about −25 ° C., and fresh food such as meat and fresh fish is preferably used. It is said that it is preferable to cool daily products such as milk and tofu to about 3 ° C. to −3 ° C. and to cool to about 5 ° C. to 10 ° C. as a refrigerator.

Therefore, in the present embodiment, two cooling units 26 are provided, one for a frozen food freezer and one for a fresh food freezer and a daily delivery refrigerator .

By doing so, cooling air at a predetermined temperature is guided to a desired showcase 1 by the supply pipe 7, and the showcase 1 can be used as a freezer or a refrigerator.

Further, the showcase 1 can be easily moved to a desired position, and the heat-insulating air conduits 47, 47A connecting the cooling unit 1 in the machine room M and the showcase 1 in the store S are also provided. Piping can be done with simple work.

Since the refrigeration cycle 27 conventionally provided for each showcase 1 has been integrated into the machine room M, the number of production parts of the showcase 1 itself is reduced, and the production cost can be reduced. . Furthermore, since the structure of the showcase itself is simplified, the installation space for the showcase 1 is reduced, and the sales area of the store S can be effectively used.

Further, in the method of performing heat exchange between brine and air using a cooling fin coil for heat exchange for generating cooling air, since the brine as a refrigerant is a liquid, the heat exchange efficiency is improved, and the conventional evaporation method is used. The vessel can be downsized.

Further, since the refrigeration cycle is concentrated in the machine room M, it is not necessary to perform the work of the refrigerant pipe, the drain pipe and the electric wiring of the cooling unit 26 for each showcase 1, thereby reducing equipment costs. In addition to this, it is possible to reduce operation and maintenance costs such as maintenance for preventing failures. Further, since the refrigerant pipe is formed in the machine room M and is almost permanent, there is no possibility that the CFC gas as the refrigerant leaks when the showcase 1 moves as in the conventional case. Is significantly shorter than before, so the number of connection points of the refrigerant pipes is reduced, and the leakage of refrigerant gas can be reduced.

Further, in the conventional cooling device, a refrigerant pipe of a considerable distance is required. For example, when a refrigerant pipe of 80 to 100 m is provided, a reduction in capacity of about 20 to 30% must be anticipated. On the other hand, the cooling device of the present embodiment is compact and has a design that does not require a reduction in capacity because no pressure loss occurs in the pipe length.

Further, the cooling of the brine used in this embodiment can be performed by using late-night electric power, and the refrigerating cycle container 27a frozen in the regenerator 29 is used as the regenerative member 32 of the brine, so that the refrigerating cycle 27 can be performed. It is not necessary to constantly drive the power supply, and the total cost for power can be reduced to 40 to 50% of the conventional showcase.

Since the centralized control in the machine room M eliminates the need to perform defrost in each showcase 1, the temperature control in the showcase 1 is improved, so that no dripping occurs and the quality control of the product is ensured. can do.

Further, the difference between the set temperature of each showcase 1 and the actual temperature is detected by the detection unit 23 of the thermostat T provided in the showcase 1 so that the steps connected to the thermostat T are performed. By driving the motor SM and automatically adjusting the opening degree of the opening automatic opening / closing valve 25 disposed in the supply pipe 7 and the recovery pipe 14 by the step motor SM, the supply and the recovery amount of the cooling air can be individually controlled. Can be adjusted in accordance with the set temperature of the showcase 1 and the difference between the set temperature and the actual temperature can be dealt with in real time. As a result, the foodstuffs and the like stored in the showcase 1 do not drip, and the quality control of the products can be ensured.

Next, FIG. 13 shows a second embodiment of the present invention.

In the first embodiment, the automatic opening control valve 25 whose opening is adjusted by the step motor SM connected to the thermostat T as the temperature control means is used as the automatic ventilation control means. The example uses a fan 59 whose rotation speed is controlled by a fan motor FM which can be controlled by an inverter connected to the thermostat T.

As for the showcase provided in the store and the cooling unit provided in the machine room M, the showcase and the cooling unit of the first embodiment are used, and the cooling unit 26 is cooled in the cooling unit 26. A supply pipe 7 for supplying cooling air to the product storage section 5 of each showcase 1 is connected to the cooling unit 26, and each end of the supply pipe 7 is connected to the cooling air passage 6 of each showcase 1. Are in communication. Further, a collection pipe 14 communicating with the cooling air passage 6 of each showcase 1 is connected to the cooling unit 26, and the air in the cooling air passage 6 of each showcase 1 is removed by the cooling unit 26.
It is configured to be collected.

FIG. 13 shows, as an embodiment of the arrangement of the fan, a fan 59 disposed in an adiabatic air conduit 47 constituting a supply pipe 7 and a recovery pipe 14 as a supply path and a recovery path for cooling air. And the fan 59
The insulated wind conduit 47 equipped with the
Description will be made assuming 0.

The supply pipe 7 and the recovery pipe 14 are formed by sequentially connecting a large number of heat-insulating air conduits 47 each formed of a heat-insulating material in a cylindrical shape in the same manner as in the first embodiment.
The insulated wind conduit 47 has a wind conduit main body 48 in which a heat insulating material is formed in a cylindrical shape. A cylindrical core 49 made of vinyl chloride or other resin is formed on the inner periphery of the center of the wind conduit body 48 to reduce air resistance, and an inner peripheral edge of one end of the wind conduit main body 48 is formed. A cylindrical connecting member 50 made of vinyl chloride or other resin is formed so as to be connected to the core 49.

The fan unit 60 is one type of the heat-insulating wind conduit. As shown in FIG. 13, a fan 60 capable of adjusting the air flow rate in the wind conduit main body 48 is rotatably provided. Have been. The rotation of the fan 59 is controlled by inverter control of a fan motor FM connected to a thermostat T disposed in the showcase 1. The fan unit 60 constitutes the supply pipe 7 and the recovery pipe 14 by being connected to another heat-insulating air conduit 47, and the number of the pipes and the installation position thereof are free depending on the length of the pipes. However, it is desirable to provide the position near the showcase 1. Further, a shutter 61 for blocking the flow of cool air in the fan unit 60 when the driving of the fan 59 is stopped is disposed near the fan 59.
9 can be opened and closed by remote control in conjunction with driving and stopping.

The operation of the present embodiment having such a configuration is as follows. The rotation speed of the fan 59 is controlled by the fan motor FM connected to the thermostat T having the detection unit 23 in the showcase 1. Thus, the supply amount and the recovery amount of the cooling air to the showcase 1 are proportionally adjusted. That is, when the detecting unit 23 of the thermostat T detects a temperature higher than the set temperature, the thermostat T
Inverter controls the fan motor FM to increase the rotation speed of the fan 59, while decreasing the rotation speed of the fan 59 when the temperature inside the showcase 1 detected by the detection unit 23 of the thermostat T is the set temperature. To do it. That is, the rotation speed of the fan 59 is adjusted according to the temperature difference between the set temperature and the detected temperature.

As described above, in the showcase cooling apparatus according to the present embodiment, the supply pipe 7 and the collection pipe 14 for connecting the cooling unit 1 in the machine room M and the showcase 1 in the store S are provided with automatic ventilation means. The fan unit 60, which constitutes the main part, can be connected to the other heat-insulated air conduits 47, 47A at any position by a simple operation, and the heat-insulated air conduits 47, 47A and the fan unit 60 are formed at low cost. be able to.

Further, since it is possible to provide a fan 59 for supplying and recovering cooling air to each showcase 1, it is possible to perform fine temperature control for each showcase 1. By adjusting the rotation speed of the fan 59 by inverter control of the fan motor FM connected to the thermostat T, the temperature in the showcase 1 can always be kept at a constant temperature. Quality preservation and management of stored fresh food, frozen food, and the like can be performed well.

The method of arranging the fan as the automatic ventilation control means is not limited to the method of incorporating the fan unit 60 in each pipe as described above.
For example, a cooling air collecting fan 59 can be provided in the supply air passage and the collection air passage in the showcase 1.

When a plurality of fans 59 are installed in the supply pipe 7 and the recovery pipe 14, for example,
4 shows a fan 5 arranged near the showcase 1
9 and the fan 59 disposed near the cooling unit 26, the number of rotations thereof is different, and so on.
Needless to say, the number of rotations can be controlled between the nine.

Further, as a showcase constituted by the present invention, a closed showcase or a reach-in showcase can be used without being limited to the open showcase as shown in the first embodiment.

For example, when a closed showcase is used, the cooling air can be confined in the showcase except when the goods stored in the closed showcase are taken in and out. The heat loss is small and the heat retention is good. Therefore, it is not necessary to constantly supply and recover the cooling air. In particular, there is a difference in the temperature in the showcase between the reach-in showcase where the door is frequently opened and closed and the reach-in showcase where the door is not frequently opened and closed. Nevertheless, supplying and collecting cooling air by centrally managing the cooling air may waste power consumption.However, such a closed showcase is provided with the automatic ventilation control means of the present invention. Therefore, it is possible to supply and recover cooling air only when necessary to maintain the temperature inside each showcase at the set temperature, and to further reduce the power consumption required for cooling inside the showcase. Savings can be made and efficient temperature management can be provided.

Also, when the reach-in showcase is used, the same effect as that when the closed showcase is used is obtained. In addition, the recovery amount of the cooling air is increased by about 5% from the supply amount. Therefore, when the shopper opens the door of the showcase, the amount of cooling air in the showcase 1 that flows into the aisle in the store can be made as small as possible, so that the shopper does not feel cold and the cooling efficiency is low. And power consumption can be reduced.

[0100] The present invention is not limited to the above embodiments, Ru can be changed as needed.

[0101]

According to the present invention, the cooling device can be concentrated in the machine room, the pressure loss of the refrigerant pipe length of the cooling device does not occur, and the cold storage of the brine can be performed by using the power at midnight. Therefore, the total power cost is 40 ~
It can be reduced by 50%. In the case of a showcase, refrigerant piping work, electrical work or drainage pipe work in the store can be dispensed with, and movement of the showcase in the store and associated piping work can be easily performed.
Also, make the recovery amount slightly larger than the cooling air supply amount.
With, the cooling inside the showcase from the opening of the showcase
Prevents so-called cold aisle where air flows out
Can, especially, open showcases and reach
Shoppers feel cold when using showcases
It is possible to prevent kinking.

Since the cooling device of the present invention circulates the cooling air to the showcase, the refrigerant does not leak out of the piping on the way and can contribute to environmental problems. Also, a showcase or vending machine with a simplified structure can increase the amount of stored goods in the same volume, and can reduce the volume when the amount of stored goods is the same, so in the case of a showcase, A large store floor area can be secured.

By arranging the refrigeration cycle as a cooling unit in the machine room in a concentrated manner, defrosting is not required in each showcase and each vending machine, so that freshness management of stored goods is improved. . Further, the number of cooling-related parts can be reduced, the frequency of failures can be drastically reduced, and operation and maintenance costs such as maintenance can be reduced.

The difference between the set temperature of each showcase and the actual temperature is determined by the temperature control means and the automatic ventilation control means provided in the showcase, and the amount of supply and recovery of the cooling air is determined for each showcase. The temperature can be finely adjusted according to the set temperature, and it is possible to respond in real time to the difference between the set temperature and the actual temperature.
Therefore, no drip occurs in the foodstuffs and the like stored in the showcase, and the quality control of the products can be ensured.

This method can reduce wasteful power consumption and perform efficient temperature management, particularly when a closed showcase and a reach-in showcase are used.

[0106]

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing a first embodiment of a showcase cooling device for implementing a showcase cooling method of the present invention.

FIG. 2 is a longitudinal sectional view of the showcase showing the first embodiment of the showcase cooling device of the present invention.

FIG. 3 is a perspective view showing a configuration of a cool air blowing duct.

FIG. 4 is an explanatory view showing one embodiment of a configuration of a cooling unit.

FIG. 5 is a plan view showing one embodiment of a structure of a cool air generation chamber.

FIG. 6 is an explanatory diagram showing a relationship between a fan in the cold air collecting chamber and a wind baffle plate.

FIG. 7 is a perspective view of an insulated air conduit.

FIG. 8 is a plan view of another type of insulated wind conduit of FIG. 7;

FIG. 9 is a perspective view showing a configuration of an air volume adjustment damper.

FIG. 10 is a sectional view taken along line aa of FIG. 9;

FIG. 11 is a partial longitudinal sectional view taken along line bb of FIG. 10;

FIG. 12 is a cross-sectional view of FIG. 9 showing rotation of a valve plate;

FIG. 13 is a longitudinal sectional view showing the structure of a fan unit according to a second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Showcase 7 Supply piping 14 Recovery piping 24 Manual open / close valve 25 Automatic opening control valve 26 Cooling unit 31 Cool air generation chamber 47 Insulated wind conduit 60 Fan unit S Store M Machine room T Thermostat SM Step motor P Piping

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F25D 11/00-16/00 F25D 17/08 318-321 F24F 5/00 102

Claims (8)

(57) [Claims] 1. A cooling unit which supplies cooling air cooled to a temperature lower than a set temperature of a showcase to a supply air passage in a showcase via a supply pipe as a cooling source, and mixes the air with the air in the showcase. While cooling the inside of the showcase, the same amount of the cooling air supplied to the showcase as a cooling source is collected through a collection pipe to the cooling unit via the collection unit, and the cooling unit collects air in the collection air passage in the showcase. A method of cooling a showcase in which collected air is recooled in a cooling unit and reused as cooling air, the supply passage including a supply pipe and a supply air passage for the cooling air corresponding to a temperature in the showcase Controlling a ventilation automatic adjusting means provided in the cooling air collecting pipe and the collecting passage including the collecting air passage. Characterized in that the supply amount and the recovery amount of the cooling air are proportionally adjusted so that the recovery amount of the cooling air is slightly larger than the supply amount of the cooling air. 2. A plurality of showcases each having a cooling air outlet communicating with a supply air passage and a cooling air suction opening communicating with a recovery air passage, a compressor and a condenser installed separately from each showcase. A refrigeration cycle for cooling a circulated brine having an expansion member and an evaporator,
A regenerator for cooling the brine cooled by the refrigerating cycle, and a heat exchanger for introducing the brine in the regenerator to exchange heat with air to generate cool air for cooling each showcase; A cooling unit comprising a cooling chamber, a supply pipe for supplying cooling air produced in the cooling air generation chamber of the cooling unit from a cooling air outlet of each of the showcases, and a cooling air for each of the showcases A collection pipe for collecting the cooling air in the cooling unit in order to pass the cooling air from the suction port to the heat exchanger in the cold air generation chamber.The supply pipe and the collection pipe have a predetermined amount of supply cold air or collection cold air in advance. An opening / closing means capable of adjusting the opening degree of each pipe for setting is provided, and a supply pipe and a supply pipe for the cooling air corresponding to each showcase in the showcase are provided. Cooling air is distributed to the supply passage including the supply air passage and the cooling air collection pipe corresponding to each showcase and the collection passage including the collection air passage in the showcase by temperature control means disposed in the showcase. Characterized in that at least one automatic ventilation control means for automatically controlling the ventilation amount is provided in order to proportionally control the amount of cooling air to be recovered to be slightly larger than the supply amount of cooling air. Case cooling device. 3. The automatic ventilation control means is an automatic opening control valve provided in a supply pipe and a recovery pipe of the cooling air, the opening of which is adjusted through a step motor driven by the temperature control means. 3. The method according to claim 2, wherein
A cooling device for a showcase according to claim 1. 4. The cooling device for a showcase according to claim 2, wherein said automatic ventilation control means is a fan which is inverter-controlled by said temperature control means. 5. A merchandise display section for displaying merchandise to be cooled, an opening of a supply air passage communicating with the merchandise display section and supplying cooling air from the outside to the merchandise display section, and a merchandise display section. A collection port of a collection air passage for communicating cooling air to the outside from the product display section, and the product display section has temperature control means for controlling the temperature of the product display section; In the passage and the collection air passage, the supply amount of the cooling air used for cooling the product display unit and the collection amount of the cooling air used for cooling are adjusted to the temperature in the product display unit.
A showcase comprising automatic ventilation control means for proportionally adjusting the recovery amount of cooling air to be slightly larger than the supply amount of cooling air. 6. The showcase according to claim 5, wherein the showcase is an open showcase. 7. The showcase according to claim 5, wherein the showcase is a closed showcase. 8. The showcase according to claim 5, wherein the showcase is a reach-in showcase.