JPH0989441A - Low temperature show case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low temperature show case capable of reducing the number of bends of a cooling pipe of a cooler, and simply changing the set temperature of each compartment. SOLUTION: A duct 15 is equally divided into a plurality of supply passages 15a, 15b by a partitioning member 21. The air in the duct is cooled by a cooler 23, and a cooling pipe 24 of the cooler consists of a straight pipe part 24a which crosses all supply passages in the duct and is approximately straight, and a curved pipe part 24b formed at an end part of the straight pipe part, and the piping is realized in a meandering manner by alternately forming a plurality of straight pipe parts and curved pipe parts. The supply volume of a blower arranged on each supply passage is different, and the compartment of a storage chamber corresponding to the supply passage in which the blower of larger supply capacity is arranged is lower in temperature than the other compartments.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low temperature showcase in which cold air cooled by a cooler in a duct is discharged into a storage chamber, and the cold air in the storage chamber is sucked into the duct again and circulated.

[0002]

2. Description of the Related Art Conventionally, a low temperature showcase of this type has been disclosed in, for example, Japanese Unexamined Patent Publication No. 6-201251 (F25D19 / 0).
As described in 0), etc. Then, the storage chamber is divided into a plurality of compartments so that the preset temperature can be made different for each compartment so that various kinds of stored goods having different storage temperatures can be stored in the storage compartment.
Therefore, the duct for circulating the cool air in the storage chamber is also partitioned by the partition plate to form a plurality of air flow passages so as to correspond to the respective compartments of the storage chamber, and the air flow passages are formed in each air flow passage. Are each equipped with a cooler.

Further, Japanese Patent Laid-Open No. 6-307755 (F
25D17 / 08), part of the partition plate that divides the duct is arranged diagonally, and the set temperature is made different for each section by narrowing or widening the cross section of the air flow passage near the cooler. It describes a low temperature showcase that allows you to.

Further, JP-A-56-61566 (F25D17 / 08) discloses a fin pitch of a cooler,
Alternatively, there is described a low-temperature showcase in which the setting temperature can be made different for each section by changing the piping layout.

[0005]

By the way, it is necessary to connect parts such as an electromagnetic valve and an expansion valve to the cooler. Therefore, if the number of coolers increases, the number of parts and the number of parts to be attached increase, and the cost increases. Further, the cooler is formed by meandering the cooling pipes. However, if the number of the coolers is large, the number of times the cooling pipes are bent in a U shape in order to meander the cooling pipes increases, and the manufacturing cost increases. .

On the other hand, when a part of the partition plate for partitioning the duct is arranged obliquely as in Japanese Patent Laid-Open No. 6-307755, it takes a lot of time to install the partition plate, and the set temperature of each section is not adjusted. Adjustment is difficult. In addition, since the cross section of the air flow passage is widened or narrowed and changes greatly, it is difficult for air to flow smoothly and uniformly. Therefore, temperature unevenness or the like is likely to occur in the cool air.

When the fin pitch of the cooler or the piping layout is changed as in Japanese Patent Laid-Open No. 56-61566, it is difficult to change the set temperature of each section. Moreover, since the cooler has a special shape, the manufacturing cost of the cooler increases.

The present invention is intended to solve the above problems, and it is possible to reduce the number of times that the cooling pipe of the cooler is bent and to easily change the set temperature of each compartment. The purpose is to provide.

[0009]

A low temperature showcase (1) of the present invention comprises a storage chamber (17) for storing a stored item, a discharge port (31) for discharging cool air to the storage chamber, and the storage chamber. Suction port (32) for sucking the air, a duct (15) for connecting the suction port and the discharge port, and a blower (22) for blowing the air in the duct from the suction port toward the discharge port And a plurality of air flow passages (15
a) and a cooler (23) for cooling the air in the duct, and a plurality of storage chambers are provided corresponding to the air flow passage of the duct. It is divided into sections (17a, 17b).

In order to achieve the above object, the ratio of the cross-sectional area of each ventilation passage to the cross-sectional area of the duct is
The cooling pipe (24) of the cooling device is substantially the same in the vicinity of the discharge port, in the vicinity of the cooler, and in the vicinity of the suction port. ) And a curved pipe portion (24b) formed at the end of the straight pipe portion, and the pipe is meandered by alternately forming a plurality of the straight pipe portions and the curved pipe portions. . And, while cooling the storage chamber, the blower is constantly driven with a substantially constant air flow rate, when the wind speed of each air flow passage is substantially the same, On the other hand, if the wind speeds of the air flow passages are different, the temperature of the compartment corresponding to the air flow passage with the faster air speed will be lower than the temperature of the compartment corresponding to the air passage with the slow air speed. .

Further, the partitioning member divides the duct into a plurality of airflow passages into substantially equal parts, and fans are arranged in the respective airflow passages to cool the storage chamber. The blower may be constantly driven with a substantially constant air flow rate. And, when the blower volume of each blower is substantially the same, the temperature of each compartment of the storage chamber is substantially the same, while when the blower volume of each blower is different, the blower with a large blower volume is arranged. The temperature of the section corresponding to the air flow path becomes lower than the temperature of the section corresponding to the air flow path in which the blower having a small air flow is arranged.

Further, a temperature sensor (16) for detecting the temperature of each compartment of the storage chamber, a flow control valve (27) for controlling the flow rate of the refrigerant flowing through the cooling pipe of the cooler, and each compartment detected by the temperature sensor. Control means (3) for controlling the flow rate control valve so that all the temperatures of
0) and may be provided.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment of a low temperature showcase according to the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of a first embodiment of a low temperature showcase according to the present invention. FIG. 2 is a sectional view of FIG. FIG. 3 is a sectional view taken along the line III-III of FIG. FIG. 4 is a refrigerant circuit diagram of the refrigeration cycle.

1 to 3, an open showcase 1 as a low temperature showcase for displaying various products such as soft drinks, bento, ham and fruits is provided with an opening 2 for storing and taking out products, and a lower part thereof is formed. A machine room 3 is arranged in the. The machine room 3 is provided with a condenser 4, a blower 5 for the condenser, a compressor 6, and the like. And, the upper wall 8, the rear wall 9 and the showcase 1,
A bottom wall 10, which is a partition wall with the machine room 3, constitutes a heat-insulating box whose one surface is open, and is made of a heat-insulating material 11 such as a foam synthetic resin such as hard foam polyurethane.

A duct top plate 12, a duct wall plate 13 and a duct floor plate 14 made of a metal plate such as a coated steel plate or stainless steel that does not rust are arranged at an appropriate distance from the inner surface of the heat insulating material 11. ing. The space between the heat insulating material 11 and the duct top plate 12, the duct wall plate 13, the duct floor plate 14 as the duct plate serves as the duct 15.
The temperature sensor 1 is provided on the upper front side, which is the tip of the duct 15.
6 are provided. On the other hand, the duct plates 12, 13, 14
The display room 17 as a storage room surrounded by is divided into two partitions 17a and 17b on the left and right by a partition wall 18. In each of the compartments 17a and 17b of the display room 17, commodity display shelves 19 are supported by a pair of left and right support brackets 20 and arranged in multiple stages.

The compartments 17a and 17b of the display room 17
As shown in FIG. 3, the duct 15 is also divided into left and right parts by a partition plate 21 as a partition member to form two air flow passages 15a and 15b.
Blowers 22 are arranged in the air flow passages 15a and 15b below the duct floor plate 14, respectively. When the display room 17 is cooled, the air volume of the blower 22 is not controlled, and the air volume is constantly and substantially constant. Note that, during the defrosting operation, night operation, etc., the blower 22 may rotate in the reverse direction, stop, or the amount of blown air may decrease. Moreover, the cooler 23 is arrange | positioned at the duct 15 behind the wall plate 13 for ducts. Cooling pipe 2 through which the refrigerant of this cooler 23 flows
4 is composed of a substantially straight straight pipe portion 24a that crosses the pair of air flow passages 15a and 15b, and a substantially U-shaped curved pipe portion 24b that is continuously formed at the end of the straight pipe portion 24a. The straight pipe portions 24a and the curved pipe portions 24b are alternately formed in a plurality and meandered. This straight pipe portion 24a
A plurality of heat exchanging fins 25 are attached at substantially equal intervals. Further, tube plates 26 are fixed to both ends of the duct 15, and the tube plates 26 support near the ends of the straight pipe portions 24a.

The cooler 23 constitutes the refrigeration cycle shown in FIG. 4 together with the condenser 4 and the compressor 6. In FIG. 4, a compressor 6 compresses a refrigerant in a gas state, and the compressed refrigerant is liquefied by heat exchange in a condenser 4. The liquefied refrigerant is guided to the cooler 23 via the solenoid valve 27 and the expansion valve 28, which are control valves, and is vaporized. During this vaporization, the cooler 23 is cooled. Then, the refrigerant discharged from the cooler 23 is used as the gas-liquid separator 29.
It returns to the compressor 6 again via. In addition, the solenoid valve 27
Is ON / OFF controlled by the control device 30 connected to the temperature sensor 16.

In FIG. 2, when the blower 22 rotates, the air in the duct 15 is blown in the direction of the arrow and forcedly circulates. That is, the air blown from the blower 22 moves to the cooler 23, is cooled, further rises, and is discharged from the cool air discharge port 31 into the display chamber 17. Then, the cool air blown out from the cool air outlet 31 forms an air curtain in the front surface of the display room 17, that is, in the product storage and take-out opening 2, and cools the inside of the display room 17.
The air that has cooled the inside of the display room 17 is sucked through the suction port 32 formed on the front side of the floor plate 14 for a duct and blown by the blower 2
Come back to 2.

This forced circulation is performed by the compartment 17 of the display room 17.
It is performed every a and 17b. By the way, although the blower 22 is driven with a substantially constant blow rate during the cooling operation, the blower 22 provided in the blow passage 15a and the blower 22 provided in the blow passage 15b are blown by The capacities are different, and the speed of air blown by the blower 22 in the blower flow path 15a is faster than the wind speed of the blower 22 in the other blower flow path 15b. The faster the wind speed of the blower 22 is, the larger the cooling capacity is. Therefore, the section 17a communicating with the blower flow path 15a having the higher flow velocity of the blower 22 becomes lower in temperature than the other sections 17b. In this embodiment, the set temperature of the compartment 17a is 0 to 5 ° C, and the other compartment 1
The set temperature of 7b is 10 to 15 ° C., and both sections 17a,
17b has a temperature difference of about 10 ° C. Therefore, the difference between the wind speed of the blower 22 in the blower flow passage 15a and the wind speed of the blower 22 in the blower flow passage 15b is set so that the temperature difference of about 10 ° C. is substantially generated.

There are various methods for controlling the temperature of the display room 17, but the first method is to use one compartment 17a or one compartment.
This is a method using a temperature sensor 16 that detects the temperature of 7b. This temperature sensor 16 is connected to the duct 15 as described above.
Is provided at the tip of the display chamber 17 to detect the temperature of the cool air discharged to one of the compartments 17 such as the compartment 17a. Since the temperature of the section 17a can be estimated by this detected temperature, the temperature of the section 17a can be indirectly detected. Further, each blower 22 is constantly operating at a constant speed, and the control device 30 as a control means has a preset temperature of the compartment 17a, for example, 5 ° C. in advance.
Is set. Then, the control device 30 compares the set temperature with the detected temperature of the section 17a, and when the detected temperature is lower, the electromagnetic valve 27 is closed and turned off, and the cooling by the cooler 23 is stopped. Conversely, when the detected temperature is higher, the solenoid valve 27 is opened and turned on to turn on the cooler 23.
To start cooling. In this way, the compartment 17a can maintain the set temperature. The other section 17b is
As described above, since there is a difference of approximately 10 ° C. from the temperature of the compartment 17a, it is possible to maintain a temperature that is approximately 10 ° C. higher than the set temperature of the compartment 17a. It should be noted that the lower the set temperature is, the more easily it is affected by the outside air temperature and the like. Therefore, it is preferable that the temperature sensor 16 detects the temperature in the lower set temperature.

As a second method, both sections 17a, 17
This is a method using the temperature sensor 16 that detects the temperature of b. The temperature sensor 16 is provided in each of the air flow passages 15a and 15b.
Are provided at the tip of each of the two compartments 17a, 17b
The temperature of is detected indirectly. Further, each blower 22 is constantly operating at a constant speed, and the controller 30 previously sets the preset temperatures of the sections 17a and 17b, for example, 5 ° C. and 15 ° C., respectively.
Is set. Then, in the control device 30, the section 17a
Comparing the set temperature of No. 1 and the detected temperature of the section 17a, and
Similarly, the set temperature of the section 17b and the detected temperature of the section 17b are compared, and when each detected temperature is lower than the set temperature, the solenoid valve 27 is closed and turned off, and conversely any detected temperature is set. When the temperature is higher than the temperature, the solenoid valve 27 is opened and turned on. In this way, both sections 17a, 17b
Can be reliably lower than each set temperature.

As described above, in the first embodiment, the cooler 23 is provided in common to the air flow passages 15a and 15b, so only one cooler 23 needs to be arranged in the showcase 1. Moreover, since the meandering of the cooling pipe 24 is performed over the entire width of the duct 15, the number of times the cooling pipe 24 is bent, that is, the number of the curved pipe portions 24b is larger than that when the meandering flow paths 15a and 15b are individually meandered. Can be reduced.

Further, the blower 22 of the blower flow passage 15a and the blower 22 of the blower flow passage 15b have different blown air flow rates as described above, and the blower 22 of the blower flow passage 15a and the blower 22 of the blower flow passage 15b are different from each other. Replacing allows you to easily change the temperature zone of each compartment. That is, if the blowers 22 are exchanged with each other when the temperature zone of the section 17a is lower than the temperature zone of the section 17b, the temperature zone of the section 17a becomes the section 1
It becomes higher than the temperature range of 7b.

Next, a second embodiment of the showcase according to the present invention will be described with reference to FIG. FIG. 5 is a sectional view of the second embodiment. In the description of the second embodiment, constituent elements corresponding to those of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 5 is a view corresponding to FIG. 3 of the first embodiment, in which the partition plate 21 is attached so as to be biased to the right side.
Depending on the deviation of the partition plate 21, the partition wall 18 not shown in FIG. 5 is also attached to the right side. Therefore, the left compartment 17a and the air flow passage 15a are
The width is wider than that of the compartment 17b and the air flow passage 15b on the right side, and the area of the cross section perpendicular to the air flow is larger on the left side than on the right side. The ratio of the cross-sectional area of each of the air flow passages 15a and 15b to the cross-sectional area of the duct 15 is substantially constant in the vicinity of the discharge port, the vicinity of the cooler, the vicinity of the suction port, and the like.

The second embodiment is also substantially the same as the first embodiment except that the partition plate 21 is attached in a biased manner, and the blower 22 is substantially stationary when the display room 17 is cooled. The air flow rate is constant, and the temperature control is performed in the same manner as in the first embodiment. Then, the compartment temperature corresponding to the high-speed air flow passage is lower than the air temperature corresponding to the low-speed air passage path.

Therefore, in the second embodiment, the blower 22 having the same air flow rate in the left and right air flow passages 15a and 15b.
When adopting, the wind speed of the left side air flow passage 15a having a wide cross-sectional area becomes slower than the wind speed of the right air flow passage 15b having a narrow cross-sectional area, and the internal temperature of the left compartment 17a is equal to that of the right compartment 17b. It becomes higher than the temperature inside the refrigerator.

As described above, in the second embodiment, the partition plate 21 is provided unevenly, and the cross section of the air flow passage 15a and the cross section of the air flow passage 15b are different. And
Since the widths of the compartments provided corresponding to the air flow passages are different, it is possible to deal with the case where the amounts of stored items stored in the compartments are uneven.

The embodiment of the present invention has been described above in detail.
The present invention is not limited to the above embodiment,
Within the gist of the present invention described in the claims,
Various changes can be made. Modification examples of the present invention are exemplified below. (1) In the embodiment, the blowers that generate different wind speeds are installed for each of the air flow passages.
It is also possible to install blowers that generate the same wind speed. In this case, the temperature of each compartment of the storage chamber is substantially the same. In the embodiment, the section 17a and the section 17
The temperature difference from b is about 10 ° C., but this temperature difference can be appropriately changed to 5 ° C. or 15 ° C., for example.

(2) In the embodiment, a blower is provided for each blow passage, but it is also possible to blow air to a plurality of blow passages with one blower. Then, in this case, it is also possible to use an air flow guide plate or the like in order to make the wind speeds of the air flow passages different.

(3) In the embodiment, the display room 17 is divided into two sections, but it is also possible to divide into three or more sections. (4) The partition wall 18 of the display room 17 can be detachable. Further, when there is not much difference between the set temperatures of the sections 17a and 17b or when the set temperatures are substantially the same, the partition wall 18 may not be provided.

(5) In the embodiment, the expansion valve 28
However, it is possible to use a capillary tube instead of the expansion valve 28.

(6) In the embodiment, the flow rate control valve for controlling the flow rate of the refrigerant flowing through the cooling pipe is the solenoid valve 27, which is ON-OFF controlled, but is not ON-OFF control but the valve. It is also possible to control the aperture amount. Further, instead of performing the ON-OFF control of the electromagnetic valve 27, the expansion valve 28 can be adopted as a flow rate control valve to control the throttle amount of the expansion valve 28.

(7) In the embodiment, the temperature sensor is provided at the tip of the duct 15. The temperature sensor detects the temperature of the cool air discharged from the duct 15 and indirectly detects the temperature of the storage chamber. Although the temperature is detected, it is possible to directly detect the temperature of the storage chamber by disposing a temperature sensor in the storage chamber.

[0035]

According to the present invention, the cooling pipe of the cooler has a substantially straight straight pipe section that traverses all the air flow passages in the duct, and a curved pipe formed at the end of this straight pipe section. Consists of
A plurality of straight pipe portions and curved pipe portions are alternately formed, and the pipes meander. Therefore, the number of curved pipe portions is reduced as compared with the case where the cooling pipe of the cooler is meandered for each air flow passage. As a result, the manufacturing cost of the cooler is reduced.

Further, the ratio of the cross-sectional area of each air flow passage to the cross-sectional area of the duct is approximately the same in the vicinity of the discharge port, the vicinity of the cooler, and the vicinity of the suction port, and the cross section of the air flow passage is greatly narrowed or widened. There is nothing to do. Therefore, the air flows smoothly and almost uniformly. As a result, temperature unevenness is unlikely to occur in the cold air.

Furthermore, since a blower whose air flow rate is constantly constant is adopted, the speed of the blower is not controlled when the temperature of the storage chamber is controlled. Therefore, the control mechanism of the blower becomes simple. As a result, the manufacturing cost can be reduced.
Further, a cooler in which the compartment temperatures are substantially the same when the wind speeds of the air flow passages are the same is adopted, and the fin pitch of the cooler and the like are substantially the same in the air flow passages. Therefore, a very general cooler can be used, and it is not necessary to use a cooler having a special structure.

The set temperature of each section can be easily changed by changing the wind speed of each blow passage.

Further, when the partition member divides the duct into substantially equal parts to form an air flow passage, and a blower is arranged in each of the air flow passages, the set temperature of one section is set to the other. If the blowers of the blower flow paths are exchanged with each other when the temperature is higher than the set temperature of the section, the set temperature of one section can be changed to be lower than the set temperature of the other section. By exchanging the blowers with each other,
The set temperature can be changed easily.

In some cases, a control means for controlling the flow rate control valve is provided so that the temperature of each section detected by the temperature sensor is equal to or lower than the set temperature of each section. In this case, it is possible to ensure that the temperature of all the compartments is equal to or lower than the set temperature, even though the cooler is commonly provided in each of the air flow passages. As a result, it is ensured that the store does not warm above the specified temperature.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment of a low temperature showcase according to the present invention.

FIG. 2 is a sectional view of FIG.

FIG. 3 is a sectional view taken along the line III-III of FIG. 2;

FIG. 4 is a refrigerant circuit diagram of a refrigeration cycle.

FIG. 5 is a sectional view of a second embodiment.

[Explanation of symbols]

 1 Showcase (low temperature showcase) 15 Ducts 15a, 15b Blower flow path 16 Temperature sensor 17 Display room (storage room) 17a, 17b Partition 21 Partition plate (partition member) 22 Blower 23 Cooler 24 Cooling pipe 24a Straight pipe part 24b Curved pipe portion 27 Electromagnetic valve (flow rate control valve) 30 Control device (control means) 31 Cold air discharge port 32 Suction port

Claims (3)

[Claims] 1. A storage chamber for storing a stored item, a discharge port for discharging cool air into the storage chamber, a suction port for sucking air in the storage chamber, and a duct for connecting the suction port and the discharge port. A blower that blows the air in the duct from the suction port toward the discharge port, a partition member that divides the duct into a plurality of air flow passages, and a cooler that cools the air in the duct In addition, in the low temperature showcase in which the storage chamber is divided into a plurality of compartments corresponding to the air ducts of the duct, the ratio of the cross sectional area of each air duct to the cross sectional area of the duct is The vicinity, near the cooler and near the suction port are substantially the same, the cooling pipe of the cooler is a substantially straight straight pipe section that crosses all the air flow passages in the duct, and the end of this straight pipe section. Such as the curved tube that is formed on the And is formed by alternately forming a plurality of straight pipe portions and a plurality of curved pipe portions, and is piped in a meandering manner. When the air is driven with a constant air flow rate and the wind speeds of the air flow paths are almost the same, the temperatures of the compartments in the storage chamber are almost the same, while when the air speeds of the air flow paths are different, the wind speed is The low-temperature showcase is characterized in that the temperature of the compartment corresponding to the fast air flow passage is lower than the temperature of the compartment corresponding to the slow air flow passage. 2. A storage chamber for accommodating a stored item, a discharge port for discharging cool air into the storage chamber, a suction port for sucking air in the storage chamber, and a duct for connecting the suction port and the discharge port. A blower that blows the air in the duct from the suction port toward the discharge port, a partition member that divides the duct into a plurality of air flow passages, and a cooler that cools the air in the duct In addition, in the low temperature showcase in which the storage chamber is divided into a plurality of compartments corresponding to the air flow passage of the duct, the partition member divides the duct into substantially equal parts, and the cooling The cooling pipe of the vessel is composed of a substantially straight straight pipe section that traverses all the air flow passages in the duct, and a curved pipe section formed at the end of this straight pipe section. By forming a plurality of curved pipe parts alternately, The air blowers are arranged one by one in each air flow passage, and when the storage chamber is being cooled, it is constantly driven with a substantially constant air flow rate. However, when the air flow rate of each blower is almost the same, the temperature of each compartment of the storage room is almost the same, while when the air flow rate of each blower is different, the blower with a large air flow is placed. A low-temperature showcase characterized in that the temperature of the section corresponding to the air flow path is lower than the temperature of the section corresponding to the air flow path in which a blower with a small air flow is arranged. 3. A temperature sensor for detecting the temperature of each section, a flow control valve for controlling the flow rate of the refrigerant flowing through the cooling pipe of the cooler, and the temperature of each section detected by the temperature sensor are all 2. A control means for controlling the flow rate control valve so that the temperature becomes equal to or lower than a set temperature of the compartment.
Or the low temperature showcase described in 2.