JPH033148B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention has an inner and outer ventilation passage each having a built-in fan so that a two-layer air curtain is formed at the opening during cooling operation, and a defrosting system is provided. The present invention relates to a cold air circulation type open show case in which, during operation, outside air introduced so as to flow backward through an outside ventilation path flows through an inside ventilation path to defrost the air.

[Conventional technology]

As this type of open show case, a multi-stage type shown in FIG. 1 is known. In Fig. 1, a main case 1 having an opening 1a for taking out products on the front side has an outer box 2 formed of a heat insulating wall, and an inner case 1 arranged with an appropriate gap between the outer box 2 and the outer box 2. A box 3 is provided, and a display room 5 partitioned into multiple stages by shelf boards 4 is formed inside the inner box 3. Also outer box 2
A partition wall 6 is provided between the inner box 3 and the inner box 3 so as to divide the gap into two, thereby forming an inner ventilation passage 7 and an outer ventilation passage 8.
is formed. Both ends of the inner ventilation passage 7 form an air outlet 7a and an inlet 7b above and below the opening 1a, respectively, and both ends of the outer air passage 8 are adjacent to the air outlet 7a and an air inlet 7b, respectively, and have an air outlet 8a on the outside thereof. and a suction port 8b. The air outlets 7a and 8a are equipped with an air regulating fluid 9 having honeycomb-shaped ventilation holes, a cooler 11 and a fan 12 are installed in the inner ventilation passage 7, and a reversible rotary fan 12 is installed in the outer ventilation passage 8. A possible fan 13 is arranged.

In the above-mentioned open shower case, during cooling operation, indoor air is circulated through the inner ventilation passage 7 in the direction of arrow A by the fan 12, and is cooled by the cooler 11 to become cold air, and this cold air is passed through the air outlet. The air is blown out from 7a to the opening 1a, and the display room 5
An air curtain 15 is formed to isolate the interior from outside air, and the interior of the display room 5 is cooled. Further, indoor air circulated through the outside ventilation passage 8 in the direction of arrow A by the fan 13 forms an air curtain 16 on the outside so that the air curtain 15 protects it.

Further, during the defrosting operation, the operation of the cooler 11 is stopped and the fan 13 is rotated in the reverse direction. Second
As shown in the figure, by the reverse rotation of the fan 13, warm outside air is sucked into the outer ventilation passage 8 from the outlet 8a. This outside air flows backward through the outside ventilation passage 8 in the direction of arrow B and is discharged from the suction port 8b. It is sucked into the air and passed in the direction of arrow A. Therefore, the frost formed on the walls of the cooler 11 and the inner ventilation passage 7 due to the cooling operation is removed by the heat of the outside air.

[Problem to be solved by the invention]

By the way, in the conventional open shower case described above, during defrosting operation, only a portion of the outside air is drawn into the inner ventilation passage 7 by the fan 12.
Since a considerable amount of outside air is discharged from the suction port 8b as shown by arrow D and dissipates outside the machine, the defrosting time becomes longer and the temperature of the displayed products increases during the defrosting operation. Ta. In addition, when assembling the main body case 1, it is necessary to assemble the fan 13, partition wall 6, fan 12, and inner box 3 in order inside the outer box 2, which requires a long work time and also requires maintenance inside the main case. For the same reason, there was a problem that the working time was increased.

Therefore, this invention aims to increase the amount of outside air sucked into the inner ventilation passage from the outer ventilation passage to defrost the air in a short time. The purpose is to provide

[Means to solve the problem]

In order to achieve the above object, the present invention provides an inner ventilation passage with a built-in cooler and a fan, and an outer ventilation passage with a built-in fan between an outer box and an inner box of a main body case having an opening on the front or top surface. A ventilation passage is formed, and during a cooling operation, both of the fans form a two-layer air curtain at the opening, and during a defrosting operation, the fan in the outer ventilation passage is rotated in the opposite direction so that the air flows backward through the outer ventilation passage. In the cold air circulation type open air case that defrosts the outside air introduced into the outside air passage by sending it into the outside ventilation passage, both of the fans are arranged horizontally in a line on the windward side of the cooler and are supported by a common fan casing, The fan casing is partitioned between the fans so that the outside ventilation passage and the outside ventilation passage are parallel to each other within the fan casing, and the suction side ventilation passages of both the fans are made a common ventilation passage, and the outside A variable speed fan motor is used for the fan built in the ventilation passage, and the motor is operated by switching from normal speed during cooling operation to high speed during defrosting operation.

[Effect]

According to the above means, the fans built in the inner and outer ventilation passages are arranged horizontally in a row and close to each other, and the suction side ventilation passages of both the fans are connected to a common ventilation passage. During the defrosting operation, the fans in the outer ventilation passages are operated in reverse rotation, so the outside air that is sucked into the outer ventilation passages by the reversely rotated fans in the outer ventilation passages and discharged into the common ventilation passage is , the fan in the inner air passage allows suction to be drawn directly from the common air passage into the inner air passage. Furthermore, since the fan in the inner ventilation passage is operated at high speed, air from the suction port of the common suction side ventilation passage is simultaneously sucked into the inner ventilation passage as well as outside air from the outside ventilation passage. Therefore, an air curtain is formed by the defrosting exhaust flow at the opening between the outlet of the inner ventilation passage and the suction opening of the common ventilation passage, and the air curtain prevents outside air from flowing into the warehouse. be done. Moreover, since both the internal and external fans are arranged horizontally in a row on the windward side of the cooler and supported by a common fan casing, the fans and fan casings can be assembled in advance as a fan unit, and the main body case can be assembled in advance. During assembly work and maintenance, simply installing the fan unit will greatly reduce work time.

〔Example〕

3 to 6 show an embodiment of the present invention, in which a fan 1 is used for the inner ventilation passage 7.
Two motors 2 are used, each with a variable speed motor 12a that can be switched between normal speed and high speed. This fan 12 and the fan 13 for the outer ventilation passage 8 are arranged in a horizontal line in the longitudinal direction of the main body case 1 with the fan 13 in the center. Reference numeral 23 denotes an integrally formed fan casing that commonly supports the fans 12 and 13 and partitions each ventilation passage into a suction side and a discharge side. Inside the fan casing 23, the inner ventilation passage 7 and the outer ventilation passage 8 formed on the discharge side of the fans 12 and 13 are defined by a partition wall 6a that partitions between adjacent fans, and a respective ventilation passage on the discharge side of each fan. Partition walls 6b and 6c are provided for communicating only with the main body case 1, and are formed in parallel in the longitudinal direction of the main body case 1. A common ventilation passage 21 is formed without a partition wall in the ventilation passages on the suction side of the fans 12 and 13, and the open end thereof forms a common suction port 21a.

In the above configuration, during cooling operation, as shown in FIGS. 4 and 5, cool air is circulated through the ventilation passage 21 and the inner ventilation passage 7 in the direction of arrow A by the fan 12 operated at normal speed. , air curtains 15 and 16 are blown out from the opening 1a by the protective air circulated by the fan 13 in the direction of arrow A through the ventilation passage 21 and the outer ventilation passage 8, as in the conventional open show case. The inside of the display room 5 is efficiently cooled and kept cold. In this case, the cold air forming the air curtain 15 and the air curtain 16
Although the air that formed the air curtains 15 and 16 is sucked in from the suction port 21a and flows through the ventilation passage 21 as a mixed air flow, even in a conventional open show case that has separate suction ports, the cold air flow and the air that formed the air curtains 15 and 16 are It is normal for the flows to be considerably mixed near the suction port, and the cooling performance will not be degraded by sharing the ventilation passage 21.

Next, during defrosting operation, the operation of the cooler 11 is stopped, the fan 13 is operated in reverse rotation, and the fan 12 is operated at high speed. As shown in FIG. 6, the fan 12 blows and forms an air curtain 15 at the opening 1a, while the fan 13 sucks outside air from the air outlet 8a, and directs the outside air passage 8 in the direction of arrow B. and is discharged into the central area of the ventilation passage 21. This outside air is dispersed to both sides of the ventilation passage 21 by the fan 12 and sucked into the inner ventilation passage 7 as shown by arrow C. At this time, the flow velocity of the outside air is increased by the fan 12 which is operated at high speed, and is drawn into the air flow flowing through the ventilation passage 21 in the direction of arrow A, and almost all of the air is sent into the inner ventilation passage 7. Therefore, the frost that has formed on the cooler 11 and the inner ventilation passage 7 is rapidly removed by the amount of heat contained in the large amount of outside air, and the defrosting operation is completed in a short time. Moreover, during this defrosting operation, an air curtain 15 is formed in the opening 1a by the defrosting exhaust flow, so this air curtain blocks the opening 1a and prevents outside air from flowing into the refrigerator. Therefore, by this outside air blocking effect and the completion of the above-mentioned short-term defrosting, it is possible to further prevent the temperature of the displayed products from rising.

Further, the fan casing 23, the fans 12 and 13 supported by an arm-shaped member (not shown) on the fan casing 23, and the partition wall 6a,
6b and 6c can be assembled in advance as a fan unit, and when assembling or maintaining the main body case 1, it is only necessary to install the fan unit, which greatly reduces the time required.

Although the above-mentioned embodiments have been described with respect to a multi-stage open show case, the present invention can also be applied to a flat case having an opening on the top surface of the main body case, and similar effects can be obtained.

〔Effect of the invention〕

According to this invention, the fans of the inner ventilation passage and the outer ventilation passage are arranged horizontally in a row on the windward side of the cooler and supported by a common fan casing, and the fan casing is partitioned between the fans. The inner ventilation passage and the outer ventilation passage are arranged in parallel within the inner ventilation passage, and the suction side ventilation passages of both the fans are made a common ventilation passage, and the fan built in the inner ventilation passage is equipped with a variable speed fan. Since a motor is used and the motor is switched from normal speed during cooling operation to high speed during defrosting operation, the outside air introduced by the fan in the outside ventilation duct during defrosting operation is approximately The entire amount flows into the inner ventilation passage, and defrosting is performed using this large amount of outside air, so the defrosting time becomes extremely short. Moreover, since an air curtain is formed by blowing out the defrost exhaust flow from the opening on the front of the case during the defrosting operation, the air curtain can prevent outside air from flowing into the refrigerator.
In this way, the rise in temperature of displayed products during defrosting operation is further eliminated. In addition, the fan and fan casing can be preassembled as a fan unit, and when assembling or maintaining the main body case, all you have to do is install the fan unit, which has the effect of greatly shortening the work time. This is extremely convenient in practice.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional open show case, Fig. 2 is a sectional view for explaining the air flow during defrosting operation in the open show case of Fig. 1, and Fig. 3 is an open show case showing an embodiment of the present invention. Figure 4 is a sectional view of the entire open housing case taken along line - in Figure 3, Figure 5 is a sectional view of the entire open housing case taken along line - in Figure 3, and Figure 6 is a sectional view of the entire open housing case taken along line - in Figure 3. FIG. 4 is a cross-sectional view of the entire device taken along the - line in FIG. 3 for explaining airflow during defrosting operation. DESCRIPTION OF SYMBOLS 1... Main body case, 1a... Opening, 2... Outer box, 3... Inner box, 6, 6a, 6b, 6c... Partition wall, 7... Inner ventilation duct, 8... Outer ventilation duct, 11
...Cooler, 12,13...Fan, 15,16
...Air curtain, 21...Common ventilation path, 23
...Fan casing.

Claims (1)

[Claims] 1. An inner ventilation passage with a built-in cooler and fan, and an outer ventilation passage with a built-in fan are formed between the outer box and the inner box of the main case, which have an opening on the front or top surface. A two-layer air curtain is formed in the opening by the fan, and during defrosting operation, the fan in the outer ventilation passage is rotated in the opposite direction so that the outside air is introduced into the inner ventilation passage so as to flow backward through the outer ventilation passage. In a cold air circulation type open shower case for sending defrosting, both of the fans are arranged horizontally in a row on the windward side of the cooler and supported by a common fan casing, and the fan casing is partitioned between the fans. The inner ventilation passage and the outer ventilation passage are arranged in parallel within the casing,
In addition, the suction side ventilation passages of both of the fans are used as a common ventilation passage, and a variable speed fan motor is used for the fan built in the inner ventilation passage, and the motor is operated during defrosting operation and during cooling operation. A cold air circulation type open case that operates by switching from high speed to high speed.