JPH09126624A - Method for cooling showcase and showcase - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly cool each showcase and effectively use the inner part of a main body. SOLUTION: A part of cold air supplied for cooling a showcase 1 is recovered to a cooling source. The cold air supplied for cooling of the quantity substantially equal to that of the cold air cooled lower than the set temperature of the showcase in the cooling source is mixed with the rest of the cold air which is not recovered to the cooling source in the showcase 1. The mixed cold air is circulated so as to pass a goods display part 3. Then, when the temperature of the case 1 rises higher than the set temperature, the quantity of cold air to be supplied to the case 1 and the quantity of cold air for recovery to be recovered to the cooling source are adjusted to be increased. When the temperature of the case 1 is lower than the set temperature, the quantity of cold air to be supplied and the quantity of ventilation of cold air to be recovered are adjusted to become 0 or to be decreased. A part of the cold air used for cooling the case is recovered to an air guide passage 21 in the case 1 and circulated in the case so as to pass the front part of the goods display part 3 of the case 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a showcase cooling method and a showcase, and more particularly to a showcase cooling method and showcase suitable for cooling a freezing or refrigerated showcase installed in a large store. About.

[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.

In this cooling unit, various devices constituting a refrigeration cycle including a compressor, a condenser, an expansion member, and an evaporator are connected by a pipe for circulating the refrigerant, and the refrigerant in the evaporator is cooled by a fan to cool the surroundings. The heat exchange with the medium is performed to cool the medium to be cooled.

[0005] To explain the cooling unit a little more, first, a refrigerant is sucked into a compressor and compressed 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 and the expansion member and the evaporator in each showcase were connected by a plurality of pipes (refrigerant pipes) for circulating the refrigerant.

When the compressor is connected to equipment in a plurality of showcases, a plurality of pipes must be connected so as to branch from the compressor side to each of the showcases so that refrigerant does not leak. Must. When the pipe is made of a copper pipe, the connecting means is connected by welding adjacent pipes or connected by a connecting member such as a screw. 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 frost formation on the evaporator by temporarily interrupting the cooling of the showcase. Therefore, conventionally, in each showcase, the water of drain water generated as a result of defrosting is removed. It was necessary to install drainage pipes for removal 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. In addition, when a failure occurs in each of the devices arranged in the showcase, repair work in the store is inevitable, which may hinder sales.

Further, 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 outlet that 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.

The present invention has been made in view of the above-mentioned points, and it is possible to appropriately cool each showcase, to reduce running costs and initial costs, and to keep the inside of the showcase main body for storing goods. It is an object of the present invention to provide a showcase cooling method and a showcase that can be effectively used for such a case.

[0016]

In order to achieve the above object, a method of cooling a showcase according to a first aspect of the present invention is such that a part of the cooling air used for cooling the showcase is cooled air in the showcase. The cooling air is recovered in the passage, and a part of the cooling air recovered in the cooling air passage is recovered in the cooling source through the cooling air recovery duct, and is cooled to a temperature lower than the set temperature of the showcase in the cooling source. The supply cooling air in an amount substantially equal to the cooling air is supplied to the cooling air supply duct in the showcase, and the cooling air in the cooling air passage not recovered in the cooling air recovery duct in the showcase is supplied. In the showcase, the balance is mixed with the supply cooling air discharged from the cooling air supply duct, and the mixed cooling air is passed through the product display section. Be allowed to ring in response to the temperature inside the showcase, to control the airflow amount of the in both ducts,
If the temperature inside the showcase is higher than the set temperature, adjust the amount of cooling air for supply to the showcase and the amount of cooling air for recovery to be collected by the cooling source so that When the temperature falls below the set temperature, the supply cooling air amount and the recovery cooling air aeration amount are adjusted to 0 or less, and the cooling not recovered in the cooling air passage is performed. A part of the air is collected in a guide air passage in the showcase, and is circulated in the showcase so as to pass through a front part of the product display section of the showcase.

According to the showcase cooling method of the present invention, the temperature of each showcase can be maintained individually and stably within the set temperature by adjusting the mixing ratio of the cooling air. it can.

Further, in the showcase according to claim 2 of the present invention, the product display section for displaying the products to be cooled, and the cooling air is circulated between the product display section and the fan by communicating with the product display section. Cooling air having a cooling air passage and a guide air passage communicating with the product display portion outside the cooling air passage and circulating guide air between the product display portion and a fan, the cooling air having passed through the product display portion. And a cooling air recovery duct that recovers a part of the cooling air recovery duct, and supply cooling air in an amount substantially equal to the amount of recovery cooling air recovered in the cooling air recovery duct is formed upstream of the fan and passes through the product display unit. Cooling air supply ducts for supplying to the air mixing chamber for mixing with the rest of the cooled cooling air, and automatic ventilation amount adjusting means respectively arranged in the both ducts and adjusting the ventilation amounts in the respective ducts. And further comprising a.

According to the showcase of the present invention, only the air used for cooling the showcase is used as the guide air as the air curtain, and the cooling air cooled to a low temperature in the machine room is actually the product. The cooling air can be used more efficiently by mixing only the recovered cooling air that cools the storage portion.

Further, in the showcase according to claim 3 of the present invention, at least one of the cooling air suction ports for sucking the air used for cooling the showcase into the cooling air passage.
It is characterized in that one cooling air suction port is arranged at the back of the product display section.

According to the showcase of the present invention, the cooling air is guided diagonally in the product display section, so that the entire product display section can be cooled more uniformly.

[0022]

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 method and a showcase cooling apparatus to which the showcase of the present invention is applied. A plurality of showcases 1 are installed in a store S such as a supermarket. Has been done.

FIG. 2 shows only one representative showcase 1. This showcase 1 is a so-called open showcase, and a part of the front is a product outlet 2.
The showcase main body 1A is formed in a box shape that is widely open as a product. In the product outlet 2 of the showcase body 1A, a product display portion 3 is formed so as to communicate with the product outlet 2. ing. A plurality of detachable shelves 4, 4, ... Are arranged at intervals in the vertical direction in the product display unit 3, and a box-shaped product storage unit is provided at the lower end of the product display unit 3. 5 is formed. The showcase body 1A 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 body 1A is not limited to the configuration shown in FIG.

The product display section 3 of the showcase body 1A
A cooling air passage 6 is provided on the back side of the upper wall 7 of the product display unit 3,
It is arranged in a U shape along the back wall 8 and the lower wall 9,
At the upper front end of the cooling air passage 6, there is formed a cooling air outlet 10 that opens to the front upper wall 7 of the commodity display unit 3 and blows the cooling air of the cooling air passage 6 downward.
Then, at the lower front end portion of the cooling air passage 6, the first cooling that opens into the front lower wall 9 of the commodity display unit 3 and introduces a part of the cooling air used for cooling into the air circulation passage 6 An air intake port 11A is formed, and further, in the rear of the showcase body 1A in the product storage unit 5, the lower wall 9 of the product display unit 3 is opened for cooling, and the inside of the showcase 1 is provided. A second cooling air suction port 11B for introducing a part of the cooling air supplied to the inner part of the cooling air passage 6 into the cooling air passage 6 is formed. The second cooling air suction port 11B is formed of, for example, a punching member.

Below the lower wall 9 of the merchandise display section 3, on the rear side of the showcase body 1A in the cooling air passage 6, an inclined partition plate 113 for partitioning the cooling air passage 6 is provided. The partition plate 13 is provided in FIG.
In the above, there is provided a fan 14 that connects the cooling air passage 6 that supplies the cooling air from the left side to the right side of the partition plate 11B.

The space defined in the cooling air passage 6 on the upstream side of the fan 14 in the cooling air circulation direction has the first cooling air recovery port 11 and the second cooling air recovery port 11.
A cooling air recovery chamber 15 for recovering the cooling air introduced from the cooling air recovery port 11B, and a cooling air recovery duct 17 having a suction port 16 at the bottom thereof is provided on one side surface of the showcase body 1A (see FIG. 3). In the left side surface), extends horizontally from the front part to the rear part of the showcase body 1A, and extends vertically upward from the lower end of the rear part of the showcase body 1A until it penetrates the top wall 18 of the showcase body 1A. It is arranged to do.

Further, at the bottom of the cooling air passage 6 on the downstream side of the fan 14, a cooling air supply duct 20 having a discharge port 19 opening toward the downstream side in the cooling air passage 6 is provided. Inside the side surface (right side surface in FIG. 3) opposite to the side surface of the body 1A where the air recovery duct 17 is located, the showcase body 1A extends horizontally from the front part to the rear part, and the rear lower end of the showcase body 1A. From the upper part in the vertical direction, the top wall 18 of the showcase body 1A
It is arranged so as to extend until it penetrates.

The cooling air passage 6 of the showcase 1
A guide air passage 21, which is also formed in a U shape, is arranged along the cooling air passage 6 at the back of the, and the upper end portion of the guide air passage 21 is in front of the cooling air outlet 10. It is a guide air outlet 22 that opens to the adjacent side and blows the air in the guide air passage 21 downward. A front end portion connected to the lower end portion of the guide air passage 21 is opened in front of and adjacent to the first cooling air suction port 11A.
It is used as a guide air suction port 23 for sucking the air in the product display section 3 into the guide air passage 21. A fan 24 for circulating guide air is provided in the guide air passage 21 near the guide air suction port 23 so as to be supported by a support plate 25.

Further, in the vicinity of the front of the guide air outlet 22 is wound a roll for partitioning the product display section 3 of the showcase main body 1A from the outside of the showcase 1, and is pulled out and wound. A night cover 26 is provided, which is biased in the winding direction by a spring (not shown) that is freely rotatable. Further, on the front surface of the showcase body 1A below the product outlet 2, a locking member 28 for locking a hook 27 protruding from the lower end of the night cover 26 is attached.

As shown in FIGS. 3 and 4, the cooling air recovery duct 17 near the top wall 18 on the rear side of the showcase body 1A has a cold air generating chamber 4 in a machine room M, which will be described later.
0 is connected to an end of a recovery pipe 29 for recovering the recovery cooling air in the showcase 1, and is collected from the inside of the showcase 1 at the center of the horizontal portion 30 of the cooling air recovery duct 17. A collected air amount control valve 31 is provided as an automatic ventilation amount adjusting means for adjusting the collected air amount.

Similarly, the cooling air supply duct 20 near the top wall 18 on the back side of the showcase body 1A is also connected to the end portion of the cooling air supply pipe 32 communicating with the cold air generating chamber. Further, at the center of the horizontal portion 33 of the cooling air supply duct 20, there is provided a supply air amount control valve 34 as a ventilation amount automatic adjusting means for adjusting the supply air amount supplied from the cold air generating chamber 40. There is.

Further, a thermostat (not shown) for adjusting the opening degree of the recovered air amount control valve 29 and the supply air amount control valve 32 for controlling the temperature in the showcase body 1A is arranged in the showcase body 1A. It is set up.

Returning to FIG. 1, in the machine room M separated from the store S in which the showcases 1 are installed, in order to cool the commodity display section 3 in each showcase body 1A in the daytime. The cooling unit 35 for daytime cooling and the cooling unit 36 for nighttime cooling for cooling the product display section 3 in the showcase body 1A at night are installed.

The daytime cooling cooling unit 35 includes a refrigeration cycle 37 including a compressor, a condenser, an expansion member (not shown) and an evaporator 41 described later, and the refrigeration cycle 3 described above.
The cold storage tank 38 that keeps the first brine cooled by heat exchange with the refrigerant cooled by 7 and the first brine that circulates in the heat exchanger 39 composed of cooling fin coils and the surrounding medium to be cooled. It is configured with a cold air generation chamber 40 that generates cooling air by performing heat exchange.
In the present embodiment, the condenser of the refrigeration cycle 37 is separately provided as a cooling tower on the rooftop or the like.

The compressor, the condenser and the expansion member constituting the refrigeration cycle 37 are sequentially connected by two pipes (not shown) for circulating the refrigerant, and the refrigeration cycle 37 and the cold storage tank are connected. The evaporator 41 of the refrigeration cycle 37 disposed inside the pipe 38 includes two pipes P1 and P1 for circulating the refrigerant for the refrigeration cycle 37.
1 is connected. Further, the cold storage tank 38
Is a first heat exchanger that does not freeze even at a relatively low temperature with each of the two heat exchangers 39 arranged in the cold air generation chamber 40.
It is connected by two pipes P2 and P2 for circulating brine. Then, the second brine is circulated between the cold storage tank 38 and the cold air generation chamber 40 by the pump 42 arranged in the pipe P2.

Here, the cooling unit 35 for daytime cooling is used.
Will be further described.

First, in the above-mentioned refrigeration cycle 37, the refrigerant is cooled to low temperature and low humidity by passing through the expansion member of the refrigeration cycle 37, and the two pipes P1 and P1 for circulating the refrigerant in this state are used for the first brine. Is supplied to the evaporator 41 in the cold storage tank 38 for storing cold. As the first brine, it is desirable to use a calcium chloride solution having a characteristic that viscosity is less likely to occur or an ethylene glycol solution,
In the present embodiment, a case where a calcium chloride solution is used will be described.

A second brine, such as sodium nitrate and water, is contained in the cold storage tank 38 at a temperature (-25 ° C to -30 ° C) slightly higher than that of the cooled calcium chloride solution (first brine). A plurality of cool storage members 38A in which a preparation agent in which other materials are mixed so as to be frozen are enclosed in a container are arranged at intervals so that the first brine can flow along the outer circumference. .

The cold storage tank 38 is connected to the heat exchangers 39 and 39 having cooling fin coils arranged in the cold air generating chamber 40 through two pipes P2 and P2 for circulating the first brine. And each of the pipes P2
An on-off valve (not shown) that is automatically opened and closed by a motor (not shown) connected to a temperature control means (not shown) such as a thermostat arranged in the cold air generation chamber 40, and the cold storage. A pump 42 for circulating the first brine kept cold is provided in the tank 38. With the on-off valve and pump 42 arranged in the pipe P2, the temperature of the generated cold air in the cold air generation chamber 40 detected by the temperature control means (not shown) arranged in the cold air generation chamber 40 has risen above the upper limit set temperature. In this case, when the opening / closing valve of the pipe P2 is opened and the pump 42 is started to lower the temperature of the generated cold air, and when the temperature control means detects the lower limit set temperature in the cold air generation chamber 40, the pipe P2 It is configured to close the on-off valve and stop driving the pump 42 to raise the temperature of the generated cool air.

It is of course possible to simultaneously cool the two heat exchangers, but if necessary, one of the heat exchangers 39 is used to cool the air, and It is preferable to alternately use the other heat exchanger 39 that has been frosted, such as by defrosting the heat exchanger 39 or by putting it in a standby state for an emergency.

As shown in FIG. 1, a pipe P2 for circulating the first brine in the heat exchanger 39 is separately provided for defrosting and is used for supplying and recovering hot brine maintained at a defrostable temperature. A pipe P3 is connected, and defrosting is performed by operating a defrosting pump 43 and a defrosting valve (not shown) interposed in the pipe P3. In the pipe P3, the calcium chloride solution as the first brine is sealed.
The first brine in the pipe P3 is the refrigeration cycle 3
7, heat exchange is performed with a coil through which a high-temperature and high-pressure refrigerant gas before reaching a condenser (not shown) flows. The heat exchange with the refrigerant gas keeps the hot brine at a temperature of about 40 ° C. It is supposed to. The temperature control of the hot brine is achieved by providing a bypass passage in the pipe P3 and performing heat exchange with the refrigerant gas as needed.

In the cooling device for the showcase of this embodiment, the inside of the cold air generating chamber 40 is partitioned for each heat exchanger 39, and two heat exchange chambers accommodating each heat exchanger 39 are formed. Warm air generated during defrosting of each heat exchanger 39 can be prevented from mixing with the cooling air generated by the other heat exchanger 39. Further, as described above, the inside of the cold air generating chamber 40 is partitioned according to each heat exchanger 39 to form a heat exchange chamber, and a cold air collecting chamber for collecting cooled air is provided for heat exchange. The partition between the chamber and the cool air collecting chamber is provided with a fan with a shutter for communicating between the two chambers, and at the time of defrosting, the shutter provided for the fan for communicating the heat exchange chamber where the defrosting is performed and the cool air collecting chamber It is also possible to prevent warm air generated at the time of defrost from entering the cold air collection chamber by closing. When two or more heat exchange chambers are provided in the cold air generation chamber 40 in this way, the cooling air recovered through the recovery pipe 31 operates, for example, a switching valve provided in the recovery pipe 31. Therefore, the heat can be distributed to each heat exchange chamber.

Further, the daytime cooling cooling unit 35.
A supply pipe 32 for supplying the cooling air cooled by the heat exchanger 39 in the cold air generating chamber 40 to the cooling air supply duct 20 of each showcase 1 is connected to the cold air generating chamber 40. . The connection position of the supply pipe 32 to the cold air generation chamber 40 is preferably a position where the air cooled by the heat exchanger 39 is blown.

Further, in this embodiment, the recovery pipe 29 communicating with the cooling air recovery duct 17 of each showcase 1 has a large blower 44 for sucking the air used for cooling and the night-time cooling unit 36. Is connected to the cold air generation chamber 40 via an evaporator 45 that constitutes a part of the cold air generation chamber 40, and the cooling air for recovery used for cooling each showcase 1 is provided in the vicinity of the heat exchanger 39 of the cold air generation chamber 40. Is configured to be collected.

The evaporator 45 includes refrigeration cycles 46 and 2
The pipe P4 is connected to form a night-time cooling unit 36.

The night-time cooling unit 36 will be described in more detail. The refrigeration cycle 46 is provided with a compressor, a condenser and an expansion member (not shown). Then, the refrigerant is sucked into the compressor and compressed, brought into a high-temperature and high-pressure state, and the high-temperature and high-pressure refrigerant is passed through a condenser such as a capillary tube to exchange heat with the outside air and release heat from the refrigerant, The refrigerant is liquefied. This liquid refrigerant is adiabatically expanded in an expansion member such as an expansion valve to a low-temperature low-pressure liquid state, and this low-temperature low-pressure liquid refrigerant is evaporated.
The refrigerant removes heat from the recovered air that passes through 5 and passes around the evaporator, thereby cooling the recovered air and vaporizing the refrigerant to the original vaporized state. Then, the step of sucking the refrigerant into the compressor again is repeated to generate the cooling air.

In other words, the evaporator 45 functions as a part of the recovery pipe 29 that simply allows the recovered air sent from the blower 44 to pass through and collects it in the cold air generating chamber 40 during the daytime, and the outside air temperature decreases. At night when the temperature inside the showcase 1 is relatively easy to manage, as described above, as part of the night-time cooling unit 36, cooling air is generated to keep the showcase cool.

In the cold air generating chamber 40, as described above, a thermostat (not shown) for detecting the temperature of the generated cold air and controlling the opening / closing of the on-off valve arranged in the pipe P2 and the drive of the pump 42. Is provided.

Next, the supply pipe 32 and the recovery pipe 29 for connecting the cold air generating chamber 40 and each showcase 1 will be described.

The supply pipe 32 and the recovery pipe 29 are
A large number of adiabatic air ducts 47 are sequentially connected.
As shown in FIG. 5, the adiabatic air duct 47 has an air duct main body 47A in which a non-combustible heat insulating material such as glass wool is formed into a cylindrical shape. A cylindrical core body 48 made of vinyl chloride or other resin is formed to reduce air resistance, and a cylindrical shape made of vinyl chloride or other resin is formed at the inner peripheral edge of one end of the air duct body 47A. Connecting member 49
Are formed so as to be connected to the core body 48. Then, the supply pipe 32 and the recovery pipe 29 are formed by connecting the ends of the pair of adjacent adiabatic air ducts 47, 47 from the inside by a connecting member 49 by adhesion or the like. In addition, a pair of adjacent adiabatic air ducts 47,
It is desirable that the outer peripheral connection portion of 47 be sealed with a sealing material such as an aluminum tape (not shown). Further, as an example of the air duct main body 47A, the length is 1 to 2 m and the inner diameter is 5 m.
A thickness of 0 to 600 cm and a thickness of about 30 to 75 mm, preferably 50 to 75 mm can be considered, but these various dimensions are different between the trunk pipe on each cooling unit 35, 36 side and the branch pipe on the showcase 1 side. It will be. Further, the wall thickness of the air duct main body 47A is preferably thicker as the cold air temperature is lower, and this thickness is determined by the thermal conductivity coefficient of the performance of the non-combustible heat insulating material so that dew condensation does not occur on the outer surface of the air duct main body 47A. Determined.

On the other hand, the supply pipe 32 and the recovery pipe 2
At the branching portion or the collecting portion of 9, there is a T-shaped tubular adiabatic air duct 50 as shown in FIG.
A tube, a Y tube, or the like may be used. Like the adiabatic air duct 47, the adiabatic air duct 50 and other adiabatic air ducts have an air duct main body 50A in which a heat insulating material is formed in a cylindrical shape, and the inner circumference of the central portion thereof is shown in FIG. Similar to the adiabatic air duct 47 shown, a core body 48 is formed. The adiabatic air duct 50 is also connected to other adiabatic air ducts 47, 50 by adhering a connecting member 49A such as the connecting member 49.

In the adiabatic air duct 50 shown in FIG. 6, connecting members 49A are attached to all three ends of the adiabatic air duct 50, but the adiabatic air duct 50 has a connecting member 4 for the other adiabatic air ducts 47, 50.
The ends not provided with 9,49A are connected. Also, it goes without saying that the connecting members 49A do not necessarily have to be provided at all three ends of the adiabatic air duct 50.

The supply pipe 32 and the recovery pipe 29 are circulated between the cooling units 35 and 36 arranged in the machine room M and the showcase 1 arranged in the store S. The work is performed by inserting the connecting member 49 into the ends of the adjacent adiabatic air ducts 47 and 50, and adhering the connecting member 49 to the adiabatic air ducts 47 and 50 with an adhesive, and further connecting the adiabatic air ducts 47 and 50. The connection portion of 47 and 50 is sealed with a sealing material such as an aluminum tape for reinforcement. The pipes of the adiabatic air ducts 47, 50 are provided in a place such as in the ceiling where they are not easily visible and do not interfere with the walk of the shopper or the carry-in of the product.

In this embodiment, the adiabatic air duct 4 using a metal member such as stainless steel as the core 48 is used.
7 and 50 are not used in the supply pipe 32 at all because they may cause dew condensation. However, as the adiabatic air ducts 47, 50 usable in the present invention, the adiabatic air ducts 47, 50 having the above-mentioned configuration are used.
It is not limited to 50. For example, as the adiabatic air duct 47, a heat insulating material having a high thermal conductivity, such as glass wool, is formed into a tubular shape, and an aluminum foil that blocks air permeability is stretched on its inner and outer surfaces to form a wind duct outer tube. On the inner circumference of the central portion, a double-piped adiabatic wind conduit 47 is used, which is made of a tubular heat insulating member having a lower thermal conductivity than that of the heat insulating material, such as hard foamed urethane, and used as a wind conduit inner tube. You can also In this case, the inner tube of the air duct is projected or recessed from each end surface of the outer tube of the air duct, and the ends of the heat-insulating air duct 47 are formed into male and female, so that the ends of the heat-insulating air duct 47 are separated from each other. , 47.

Further, the aluminum tape as a sealing material used for further sealing the connection portion of the heat insulating air ducts 47, 50 may be a heat insulating tape made of a non-combustible material.

Further, in the present embodiment shown in FIG.
The refrigerator 51 as well as the showcase 1 is similarly cooled by the cooling air from the cold air generation chamber 40.

Next, the operation of this embodiment having the above-mentioned structure will be described.

First, by driving the refrigeration cycle 37 in the cooling unit 35 for daytime cooling, the low-temperature low-pressure liquid refrigerant is circulated through the pipe P1 through the evaporator 41 arranged in the cold storage tank 38. Thus, the pump 42 is driven to exchange heat with the first brine flowing in the cold storage tank 38 to cool the first brine to −30 ° C. to −35 ° C.

In the cold storage tank 38, -30 ° C to -35
A little higher than the calcium chloride solution due to the first brine calcium chloride solution cooled to
Since the cold accumulating member 38A in which the formulation mainly composed of sodium nitrate and water adjusted to be frozen at 30 ° C. is enclosed is frozen, the calcium chloride solution produces cooling air for cooling each showcase 1. By being circulated for heat exchange, the degree of cooling is somewhat loosened, and the cool storage member 3
When the temperature rises above 8A, the cool storage member 38A, in turn, functions as a cool storage member 38A that cools the calcium chloride solution that is the first brine. In addition, since the cold storage member 38A melts because the second brine in the container is frozen, it absorbs a large amount of latent heat from the object of heat exchange. Therefore, it is not necessary to continuously drive the refrigeration cycle 37. That is, the refrigeration cycle 37 is driven only when the temperature of the first brine calcium chloride solution is such that the cooling air of the predetermined temperature cannot be generated in the cold air generation chamber 40, and the first brine calcium chloride solution is driven. While cooling
The calcium chloride solution is circulated by opening / closing the on-off valve arranged in the pipe P2 and driving the pump 42.

Therefore, for example, by using inexpensive late-night power, the second inside the regenerator 38A installed in the evaporator 41 can be used within 10 hours from 22:00 to 8:00 the next day.
The preparation mainly composed of sodium nitrate and water as the brine is sufficiently frozen, and the operation of the refrigeration cycle 37 is stopped in the daytime so that the cold storage utilization operation in the first brine and the second brine is performed. The refrigeration cycle 37 may be driven only when the 1-brine temperature exceeds the set temperature.

Further, if a plurality of types of cool storage members 38A in which a plurality of types of second brines having different freezing temperatures are enclosed in a plurality of containers are provided in the cool storage tank 38, a plurality of cool storage members 38A can be provided. Since a plurality of melting temperatures of the individual cool storage members 38A are obtained, a time lag occurs during melting in which a large amount of heat is taken from the calcium chloride solution that is the first brine, and therefore, the above-mentioned 1 The brine can be kept cold stably.

The collected air from each showcase 1 that is sucked by the drive of the blower 44 through the collection pipe 29 and collected in the cold air generation chamber 40 serves as a heat exchanger 39 in the cold air generation chamber 40. It is cooled by heat exchange with the first brine passing through the cooling fin coil. Then, the generated cooling air is supplied through the supply pipe 32 into the cooling air supply duct 20 to which the tip portion is connected. The cooling air is the cooling air supply duct 2
Through the discharge port 19 into the cooling air passage 6.

As described above, in this embodiment, the circulation of the cooling air between the showcase 1 arranged on the store S side and the cold air generating chamber 40 arranged on the machine room M side is as follows.
This is performed by suction of the air used for cooling by one large blower 44 arranged in the recovery pipe 29.

Since the large blower 44 is arranged only in the recovery pipe 29, the heat generated by the fan motor generated by the rotation of the blower 44 and the frictional heat between each blade of the blower 44 and the air are generated. Since various heats such as the above will act only on the collected air collected from the showcase 1, it is possible to prevent the disadvantage that the cooling air is heated before being supplied to the showcase 1. Further, since the large-sized blower 44 is arranged on the machine room M side, it is possible to prevent noise from being generated in the store S due to the rotation of the blower 44.

On the other hand, in the cooling air passage 6, the first lower wall 9 of the product display section 3 of the showcase 1 is formed.
Cooling air suction port 11A and second cooling air suction port 11B
The cooling air that has been sucked into the cooling air recovery chamber 15 and used for cooling the inside of the product display unit 3 is partially from the suction port 16 of the cooling air recovery duct 17 to the cooling air recovery duct 1
7 and the remaining cooling air is collected into the partition plate 1
The fan 14 disposed at 3 supplies the cooling air to the downstream side of the cooling air passage 6 and mixes it with the supply cooling air supplied from the discharge port 19 of the cooling air supply duct 20 to cool the showcase 1. The cooling air is adjusted to the optimum temperature. At this time, for example, when the amount of air recovered in the air recovery chamber 15 is 100 and the amount of air recovered in the cooling air recovery duct 17 (hereinafter referred to as recovered air amount) is 30, the fan 14 causes The cooling air supplied to the downstream direction of the cooling air passage 6 for cooling (the amount of air is 70
(Corresponding to (1)), the amount of cooling air supplied from the cooling air supply duct 19 is approximately equal to the amount of collected air (hereinafter referred to as supply air amount) of 30 in the cooling air passage 6.

In order to eliminate the problem of cold aisle in front of the showcase 1, the amount of collected air to the cooling air collecting duct 16 may be slightly larger than the amount of air supplied from the cooling air supplying duct 19. For example, as in the above-described example, the total amount of air used for cooling the showcase recovered in the air recovery chamber 15 in the cooling air passage 6 is 1
00 and the amount of recovered air recovered in the cooling air recovery duct 16 is 30, the supply air amount supplied from the cooling air supply duct 19 is adjusted to 25, and the supply cooling air is adjusted to showcase. Of the cooling air used for cooling the cooling air, it is mixed with the remaining 70 of the cooling air that has not been recovered in the cooling air recovery duct 16 and the total amount of the cooling air is 95. Three
Supply in the direction. By doing so, the cooling air in the vicinity of the product outlet 2 of the showcase body 1A is sucked into the cooling air passage 6 from the cooling air inlet 11A according to the flow of air without flowing out into the store. Therefore, the problem of cold aisle will be solved.

The cooling air used for cooling the showcase 1 in the above embodiment is the cooling air passage 6 from the first cooling air suction port 11A and the second cooling air suction port 11B.
It is as described above that the air is once recovered to the cooling air recovery chamber 15 inside, but at that time, from the second cooling air suction port 11B and the amount of air used for cooling that is recovered from the first cooling air suction port 11A. The amount of air used for the cooling to be recovered may vary depending on, for example, the opening area ratio of the first cooling air suction port 11A and the second cooling air suction port 11B.
The ratio can be adjusted by disposing an open / close control valve in 1B and adjusting the amount of collected air. In the present embodiment, the first cooling air suction port 11A and the second cooling air suction port 11B are formed in advance so that the opening area ratio thereof is 4: 6, and the first cooling air suction port 11A.
It is assumed that the cooling air used for cooling the inside of the showcase 1 is recovered in the air recovery chamber 15 at a ratio of 4: 6 by slightly reducing the amount of air recovered from.
If the collection ratio of the collected air amount is set to 5: 5 or is set to a ratio of about 4: 6 as in the present embodiment, the air outside the showcase 1 should be taken into the showcase more than necessary. Not only that, the cooling air can be easily guided to the inner portion of the product display portion 3 of the showcase 1, and proper and efficient cooling can be performed.

The mixing ratio and amount of the cooling air is
It can be changed according to the time required for cooling and the temperature inside the showcase body 1A. As a method,
In the present embodiment, the opening degree of the recovered air amount control valve 31 disposed in the cooling air recovery duct 17 and the supply air amount control valve 34 disposed in the cooling air supply duct 20 is adjusted to adjust the cooling air recovery duct. The recovered cooling air amount from 17 and the supplied cooling air amount from the cooling air supply duct 20 are substantially equal to each other, or when there is a cold aisle problem, the recovered cooling air amount is slightly larger than the supplied cooling air amount. In this way, the cooling air supplied from the cooling air recovery duct 19 may be mixed with the remaining cooling air not recovered in the cooling air recovery duct 17.

The opening degree of the collected air amount control valve 31 and the supply air amount control valve 34 is adjusted by the collected air amount control valve 31 and the supply air connected to the thermostat according to the temperature in the showcase body 1A. This is performed by driving the step motor SM of the air amount control valve 34. When the thermostat arranged in each showcase body 1A detects that the temperature in the showcase body 1A has once dropped to the set temperature, each control valve 31, 34
By rotating a valve plate (not shown) in the closing direction, the opening degree of each of the control valves 31 and 34 is reduced, the amount of cooling air supplied to the showcase 1 is reduced, and the showcase 1 is recovered. The amount of collected air is also reduced to keep the showcase 1 cool.

When the temperature inside the showcase 1 rises above the set temperature, the valve plates of the control valves 31 and 34 are opened so as to increase the opening, and the showcase 1 is supplied. It is assumed that the amount of cooling air is increased, a larger amount of cooling air is supplied into the showcase 1, and the amount of recovered air recovered from the showcase 1 is increased.

The thermostat is controlled so as to operate when the difference between the set temperature of the showcase 1 and the actual temperature is ± 1 ° C., for example, and is arranged in the cooling air recovery duct 17. The recovered air amount control valve 31 and the supply air amount control valve 34 disposed in the cooling air supply duct 20 proportionally control the opening degree according to the temperature in the showcase 1 by a step motor (not shown) connected to the thermostat. Will be done.

The control valves 31 and 34 do not adjust the opening as described above, but may be on / off controlled so as to completely open and close the flow of cold air. is there.

The recovered air amount control valve 31 disposed in the cooling air recovery duct 17 and the supply air amount control valve 34 disposed in the cooling air supply duct 20 are replaced by a blower, and the blower is replaced by the blower. It is also possible to control the rotation on and off, or to control the rotation speed of the blower with an inverter.

Further, the control valves 31 and 34 may be arranged also in the above-mentioned supply pipe 32 and recovery pipe 29 to adjust the amount of air flowing therethrough.

Then, in the showcase 1, the cooling air mixed as described above passes through the cooling air passage 6 of the showcase 1 by the fan 14 arranged on the partition plate 13, and the product display is performed. Cooling air outlet 1 of section 3
It is blown out from 0.

The cooling air outlet 10 is the showcase 1
Since the cooling air is provided on the front upper wall 7 of the showcase 1, the cooling air descends downward from above the product display unit 3 of the showcase 1, and the products in the product display unit 3 are cooled at that time. It will be.

On the other hand, the cooling air recovered in the cooling air recovery duct 17 is cooled again in the daytime through the cooling air recovery duct 17, the recovery pipe 29 and the evaporator 41 by the drive of the blower 44 as described above. It will be returned to the cold air generating chamber 40 of the cooling unit 35.

In this way, the cooling air circulates between the cold air generating chamber 40 of the cooling unit 35 and each showcase 1 and in the showcase 1 to cool the products in the product display section 3 of each showcase 1. Be used for.

Further, a part of the cooling air used for cooling the product display section 3 is supplied from the guide air suction port 21 opening in front of and adjacent to the first cooling air suction port 11A to the fan 2
4 is sucked into the guide air passage 21 by the rotation of 4 and passes through the guide air passage 21 and is displayed in front of and adjacent to the cooling air outlet 10. It is blown out in front of the part 3. The air blown in this way (hereinafter referred to as the guide air) functions as an air curtain that prevents the cool air in the showcase 1 from flowing out into the store S, performs appropriate cooling, and cools the cold aisle. The problem of will be eliminated.

Further, in the present embodiment, at night, the refrigeration cycle 37 is driven only to store the cold of the first brine and the second brine, and does not contribute to the cooling of each showcase 1.

Usually, the night showcase 1 is arranged in the showcase main body 1A and is formed into a roll, and the night cover 26 that accommodates the drawer and winding freely is developed, and its hook 27 is locked. By covering with 28, the entire surface of the product outlet 2 of the showcase body 1A is covered,
By partitioning the product display unit 3 from the outside of the showcase 1, the cooling air of the product display unit 3 is prevented from flowing out of the showcase 1.

Furthermore, at night, the night cover 2
The product outlet 2 of each showcase 1 is covered with 6 and the outside air temperature is lower than during the daytime, and the number of people entering and exiting is also reduced, so the temperature in the store S remains low and the temperature change is small. The width of the temperature change of the showcase 1 is also small. Therefore, the temperature management of the showcase 1 of the entire store S is sufficient with the cooling air generated by the cooling unit 36 for night cooling configured by the small evaporator 45 and the small refrigeration cycle 46 separately provided for night management. By driving a large blower 44, this cooling air is supplied to each showcase 1 from the supply pipe 32 through the cold air generation chamber 40. The circulation path of the cooling air at this time is assumed to be the same as the circulation of the cooling air in the daytime described above.

Although the cooling method using the night cooling unit 36 has been described in the present embodiment, the night cooling unit 36 is not essential, and the daytime cooling unit 35 is used for daytime cooling. It is also possible to cool the showcase 1 at night as well as to store cold. The load of refrigeration and cooling at night in Showcase 1 is 25% of the load of refrigeration and cooling during the daytime.
Since it is assumed to be 30%, in that case, the refrigeration function power is 75% to 70% surplus. This 75%
With 70% freezing function, the store is closed at night, for example,
It is also possible to store cold at 10 o'clock from 22:00 pm to 8:00 the next morning. When such a method is adopted, it is not necessary to use a refrigerator having a large capacity, and cold storage may be performed with the remaining refrigerating function.

Also, in winter or cold regions where the outside temperature is low, the showcase body 1 is used only by using the night cover.
In some cases, the inside of the product display section 3 of A can be kept cool.

However, the night-time cooling unit 36
By disposing the above, since the cool storage tank 38 of the daytime cooling unit 35 need only be small, the installation space of the daytime cooling unit 35 can be reduced and the type of power used can be clarified. it can. Furthermore, the daytime cooling cooling unit 35 can function as a backup even if it should fail during the daytime, and it can be used as a dehumidifying auxiliary for the daytime cooling cooling unit 35 during high humidity such as summer. There is an advantage that it can be used as.

In terms of food management, when the showcase 1 is used as a freezing showcase, the set temperature is preferably about -25 ° C, and fresh foods such as meat and fresh fish are at 3 ° C to-° C. It is said that it is preferable to cool daily products such as milk and tofu to about 3 ° C in a refrigerator to about 5 ° C to 10 ° C.

Therefore, in this embodiment, if necessary, the cooling units 35 and 36 described above are used for both the frozen food freezer and the fresh food refrigerator / daily food refrigerator.
It is assumed that the showcase 1 is prepared as a freezer or a refrigerator by guiding the cooling air having a predetermined temperature to the desired showcase 1 through the supply pipe 32.

As described above, in the present embodiment, the cooling air passage 6 is formed in each showcase body 1A, and a part of the cooling air in the cooling air recovery chamber 15 of the cooling air passage 6 is recovered by the cooling air. The air is collected in the cold air generation chamber 40 of the machine room M through the duct 17 and the collection pipe 29, and is recooled.
The recooled cooling air is supplied to the cooling air passage 6 of the showcase 1 via the supply pipe 32 and the cooling air supply duct 20 and mixed with the remaining cooling air not recovered in the cooling air recovery duct 17. Cooling air in a temperature suitable for cooling the inside of the showcase 1 is manufactured, and the mixed cooling air is used to cool the showcase 1. The temperature inside the showcase main body 1A is the same as that of the cooling air. It is possible to maintain the temperature within the set temperature individually and stably by adjusting the ratio of.

Further, in the showcase cooling method and the showcase of this embodiment, the guide air as the air curtain uses only the air used for cooling the showcase and is cooled to a low temperature in the machine room M. The cooling air can be used more efficiently by mixing it with only the recovered cooling air that actually cools the product storage unit, thus reducing the manufacturing cost of the cooling air. It can be reduced.

In the present embodiment, the cooling air used for cooling the product display section 3 is provided with the first cooling air suction port 11A arranged on the lower front wall of the showcase 1 and the product storage section 5.
The second cooling air suction port 11B disposed in the inner part of the cooling air recovery chamber 15 is configured to collect the cooling air in the cooling air recovery chamber 15 of the cooling air passage 6 by driving the fan 14. The cooling air supplied into the product display unit 3 is guided to the lower rear part of the product display unit 3, so that the entire product display unit 3 can be cooled more uniformly.

Further, according to the present embodiment, the showcase 1 can be easily moved to a desired position, and the cooling units 35 and 36 in the machine room M are connected to the showcase 1 in the store S. The adiabatic air ducts 47 and 50 to be used can also be installed by a simple operation.

Since the refrigerating cycles 37 and 46, which are conventionally arranged for each showcase 1, are integrated in the machine room M, the number of manufacturing parts of the showcase 1 itself is reduced, and the manufacturing cost can be suppressed. Becomes 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.

In addition, the refrigerating cycles 37 and 46 are connected to the machine room M.
By concentrating on each of the show units 1, it is not necessary to perform the work of the refrigerant pipes, the drain pipes, and the electric wiring of the cooling units 35 and 36 for each showcase 1, and the facility cost can be reduced and the breakdown can be prevented. It is also possible to reduce the operation and maintenance costs such as maintenance. 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 used, it is necessary to anticipate a capacity reduction of about 20 to 30%. On the other hand, the cooling device according to the present embodiment is compact, and since pressure loss in the pipe length does not occur, it is not necessary to consider capacity reduction.

Further, the brine used in the present embodiment can be cooled by using the midnight electric power, and the refrigerating cycle 37 of the daytime cooling cooling unit 35 can be performed by the cool storage member 38A provided in the cool storage tank 38. It is not necessary to drive all the time, and it is possible to significantly reduce the total cost for electric power compared to the conventional showcase.

Further, since the temperature of the showcase 1 at night can be controlled by using the separately provided evaporator 45 and the small refrigeration cycle 46, the temperature can be controlled at about 25% of the cooling load heat amount of the showcase 1 in the daytime. It is economical.

Since it is not necessary to perform defrosting in each showcase 1 by the centralized control in the machine room M, the temperature control in the showcase 1 is good, so that drip does not occur and the quality control of the product is perfect. can do.

Further, as the showcase 1 of the present invention,
A flat showcase, a closed showcase, a reach-in showcase, or the like can be used regardless of the open showcase as illustrated in the above-mentioned embodiment. Since the cooling air can be confined in the showcase except when the stored products are taken in and out, the heat loss is small and the heat retention is good as compared with the open showcase, for example. Therefore, there is little need to constantly supply and recover cooling air.
The reach-in showcase where the doors are frequently opened and closed and the reach-in showcase where the doors are not opened and closed, despite the difference in the temperature inside the showcase, centrally manage and supply and collect the cooling air. This may result in waste of power consumption, but in the case of this embodiment,
By providing the recovery air amount control valve and the supply air amount control valve as described above, the cooling air is supplied / recovered only when it is necessary to keep the temperature inside each showcase 1 constant at the set temperature. As a result, the power consumption for cooling the inside of the showcase 1 can be further greatly saved, and efficient temperature management can be performed.

Further, in the present embodiment, as described above, the cooling air supply duct 20 is provided on the cooling air recovery duct 17 side with respect to the opening degree of the valve plate of the supply air amount control valve 34 provided on the cooling air supply duct 20. If the opening of the valve plate of the collected air amount control valve 31 is increased and the amount of cooling air collected from the showcase 1 is controlled to be, for example, about 5% larger than the amount of cooling air supplied to the showcase 1. , The showcase 1 from the product outlet 2 formed on the front of the showcase 1 in an open state
There is an effect that the cooling air inside does not leak outside (inside the store). This means that the low temperature cold air accumulated in the passage in front of the showcase 1 is eliminated and the customer and the store clerk are not damaged by the low temperature, and the problem of so-called cold aisle can be solved.

FIG. 7 shows a second embodiment of the showcase. This showcase is different from the showcase of the first embodiment described above in that the showcase opened in the product storage section 5 is different from the one shown in FIG. This is different in that only the second cooling air suction port 11B in the showcase shown in the first embodiment is provided as a suction port for taking in the cooling air into the cooling air passage 6. , Other components are unchanged.

That is, the product is supplied from the cooling air outlet 10 to the product display unit 3 of the showcase 1, and the products in the product display unit 3 are cooled. The air used for cooling the product is cooled by the cooling air recovery chamber 15 in the cooling air passage 6 only from the cooling air suction port 11B formed in the inner part of the product storage unit 5.
Will be collected. The subsequent air circulation, recooling means, etc. are the same as in the case of the first embodiment described above.

In the vicinity of the front of the product display section 3 of the showcase 1, in the first embodiment, the air used for cooling the showcase 1 near the front of the product display section 3 of the showcase 1. Are collected in the cooling air passage 6 and the guide air passage 21 from the first cooling air suction port 11A and the guide air suction port 23, whereas in the present embodiment, they are collected in the front lower wall 9 of the showcase 1. Only the inside of the guide air passage 21 is recovered from the provided guide air suction port 23. The collected air circulates in the guide air passage 21 by driving the fan 24, and the guide air outlet 22
It is the same as the above-described first embodiment in that it is configured to blow out from the front to the front of the showcase 1.

In the showcase of this embodiment having the above-described structure, the cooling air supplied from the cooling air supply duct 20 is guided to the inner part of the product display section 3, so that the entire product display section 3 can be made uniform. In addition to cooling, it has substantially the same operational effects as the first embodiment.

FIG. 8 shows a third embodiment of the showcase. This showcase is different from the showcase of the first embodiment described above in that the showcase opened in the product storage section 5 thereof. This is different in that only the first cooling air suction port 11A in the showcase shown in the first embodiment is provided as the suction port for taking in the cooling air into the cooling air passage 6. , Other components are unchanged.

That is, the products are supplied from the cooling air outlet 10 to the product display unit 3 of the showcase 1, and the products in the product display unit 3 are cooled. The air used for cooling the product is collected in the cooling air collecting chamber 15 in the cooling air passage 6 only from the cooling air suction port 11A formed in the front lower wall 9 of the showcase body 1. Become. The subsequent air circulation, recooling means, etc. are the same as in the case of the first embodiment described above.

In the showcases according to the three embodiments described so far, all of the showcases are blown out from the guide air outlet 22 so as to cover the front surface of the showcase 1, and the cooling air is cooled by the guide air functioning as an air curtain. Three
Although the product is appropriately cooled by allowing the product to circulate in such a manner as to be retained therein, in particular, in the present embodiment, the cooling air suction port 11 is provided only in the front part of the showcase, The cooling air near the back of the product display unit 3 has less air movement than the cooling air near the front of the product display unit 3, and is less affected by the air temperature outside the showcase 1. As a result, The products in the display unit 3 can be appropriately cooled. Further, also in the present embodiment, other operational effects are almost the same as those in the first embodiment.

The present invention is not limited to the above-mentioned embodiment, but various modifications can be made as necessary. For example, in the above-described embodiment, the case where the brine is used as the medium that exchanges heat with the air used for cooling when generating the cooling air has been described, but the cooling is performed by the refrigeration cycle without interposing the brine. It is also possible to cool the cooling air by directly exchanging heat with the generated refrigerant.

[0109]

According to the showcase cooling method of the present invention, only the air used for cooling the showcase is used as the guide air as the air curtain, and the air used for cooling the showcase is By using mixed cooling air that is a mixture of the cooling air supplied from the cold air generation chamber and a part of the recovered cooling air, compared to the case where cooling is performed only by the cooling air supplied from the cold air generation chamber. The cost for cooling the air can be reduced, which is economical.

In the case of a showcase, it is possible to eliminate the need for refrigerant piping work, electrical work, or drainage pipe work inside the store, and it is possible to easily move the showcase inside the store or carry out the piping work associated therewith.

Further, the showcase having a simplified structure can increase the product storage amount in the same volume, and can reduce the volume when the product storage amount is the same. It is possible to secure a large sales floor area.

Further, the difference between the set temperature and the actual temperature of each showcase is controlled by the temperature control means and the automatic air flow rate control means provided in the showcase, so that the supply and recovery amounts of the cooling air are controlled by the individual showcases. It can be finely adjusted according to the set temperature of the case, and it can respond to the difference between the set temperature and the actual temperature in real time, so the temperature management in the showcase is good. Therefore, the food products stored in the showcase do not drip and the quality control of the products can be ensured.

By arranging the cooling air suction port of the showcase in the inner part of the product display part, the cooling air is guided to the corner of the product display part, and the entire product display part is cooled more evenly. can do.

Further, by making the recovered amount slightly larger than the supply amount of the cooling air, it is possible to prevent the so-called cold aisle in which the cooling air in the showcase flows out from the product outlet of the showcase to the outside. When using the open showcase and reach-in showcase,
It is possible to prevent the shopper from feeling cold.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view showing the showcase of FIG. 1;

3 is a cross-sectional view taken along the line AA of the showcase of FIG.

FIG. 4 is a plan view showing the showcase of FIG. 1;

5 is a perspective view of the adiabatic air conduit of FIG.

FIG. 6 is a perspective view of another type of adiabatic wind conduit of FIG.

FIG. 7 is a vertical sectional view showing a showcase according to a second embodiment of the present invention.

FIG. 8 is a vertical sectional view showing a showcase according to a third embodiment of the present invention.

[Explanation of symbols]

 1 Showcase 1A Showcase body 2 Product outlet 3 Product display 4 Shelf 5 Product storage 6 Cooling air passage 7 Upper wall 8 Back wall 9 Lower wall 10 Cooling air outlet 11 Cooling air inlet 11A First cooling air Suction port 11B Second cooling air suction port 13 Partition plate 14 Fan 15 Cooling air recovery chamber 16 Suction port 17 Cooling air recovery duct 18 Top wall 19 Discharge port 20 Cooling air supply duct 21 Guide air passageway 22 Guide air outlet 23 Guide air Suction port 24 Fan 25 Support plate 26 Night cover 27 Hook 28 Locking member 29 Recovery pipe 30 Horizontal part 31 Collected air amount control valve 32 Supply pipe 33 Horizontal part 34 Supply air amount control valve 35 Cooling unit 36 Cooling unit 37 Refrigeration cycle 38 Cool storage tank 38A Cool storage member 39 Heat exchanger 40 Cold air generation chamber 41 Evaporation 42 Pump 43 Pump 44 blower 45 an evaporator 46 the refrigerant cycle 47 adiabatic air conduit 48 core 49 connecting member 50 adiabatic air conduit 50A air conduit body 51 Refrigerator

Claims (3)

[Claims] 1. A part of the cooling air used for cooling the showcase is collected in a cooling air passage in the showcase, and a part of the cooling air collected in the cooling air passage is cooled air. Supplying cooling air to the cooling air supply duct in the showcase in an amount substantially equal to that of the cooling air cooled in the cooling source to a temperature lower than the set temperature of the showcase through the collection duct. At the same time, in the showcase, the remainder of the cooling air in the cooling air passage that has not been recovered by the cooling air recovery duct is mixed with the supply cooling air discharged from the cooling air supply duct, and the mixed cooling air is mixed. Is circulated in the showcase so as to pass through the product display section,
The air flow rate in both the ducts is controlled according to the temperature in the showcase, and when the temperature in the showcase is higher than the set temperature, the cooling air amount for supply to the showcase and the cooling are supplied. When the temperature inside the showcase falls below the set temperature, the supply cooling air amount and the recovery cooling air aeration amount are adjusted to 0 when the collection cooling air amount recovered by the source is increased. Or the amount of cooling air that is not collected in the cooling air passage is collected in the guide air passage in the showcase, and the front part of the product display section of the showcase is collected. A method of cooling a showcase, characterized in that the showcase is circulated so as to pass through. 2. A product display unit for displaying products to be cooled, a cooling air passage communicating with the product display unit for circulating cooling air between the product display unit and a fan, and an outside of the cooling air passage. With a guide air passage that circulates guide air between the product display unit and the product display unit by a fan, and a cooling air recovery duct that recovers a part of the cooling air that has passed through the product display unit, Air mixing for mixing supply cooling air in an amount substantially equal to the amount of recovery cooling air recovered to the cooling air recovery duct with the rest of the cooling air formed on the upstream side of the fan and passing through the product display section. A showcase further comprising cooling air supply ducts to be supplied to the room, and automatic ventilation amount adjusting means arranged in the both ducts for respectively adjusting the ventilation amounts in the respective ducts. . 3. At least one cooling air suction port of the cooling air suction ports for sucking the air used for cooling the showcase into the cooling air passage is arranged at the back of the product display section. Showcase to do.