JPH0233591A - Cold air circulation type open showcase - Google Patents

Abstract

PURPOSE:To control the rise of the temperature of commodities and prevent the generation of the loss of the commodities upon defrosting operation by a method wherein a fan, a cooler and a heater are provided in a cold air circulating passage and the inside of a showcase is cooled by circulating cooled air upon cooling operation while heated air is circulated upon the defrosting operation to defrost the cooler. CONSTITUTION:Upon defrosting operation, a heater 8 is conducted and a fan 6 is operated at high speed with normal rotation during the time of conduction of the heater 8. Air, heated by the heater 8, flows into the direction of an arrow sign A in a diagram to defrost a cooler 7. In this case, much amount of atmosphere is sucked by the high speed rotation of the fan 6 through a suction port 4b to promote the defrosting whereby a time for defrosting may be shortened compared with the same so far. The heated air, provided with excessive heat after washing the cooler 7 and sent toward a blow-off port 4a, is cooled by a cold heat accumulating body 15 and is blown out of outlet port 4a.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention includes a fan, a cooler, and a heater in a cold air circulation path formed in a main body case, and during cooling operation, circulates cooling air to cool the inside of the refrigerator. The present invention relates to a cold air circulation type open showcase that cools the refrigerator and defrosts the cooler by circulating heated air during defrosting operation.

[Conventional technology]

The one shown in FIG. 6 is known as this type of open showcase. In the figure, a main body case 1 of an open showcase having an opening 1a for displaying the number of products on the top surface has a cold air circulation path 4 between an outer box 2 made of a heat insulating wall and an inner box 3.
A refrigerator interior 5 is formed inside the inner box. Both ends of the cold air circulation path 4 form an air outlet 4a and an air inlet 4b on both sides of the opening 1a, and a fan 6, a cooler 7, and a heater 8 for defrosting the cooler are disposed inside the air outlet 4a. An air regulating fluid 9 is attached to the.

During the cooling operation of the open showcase, air inside the refrigerator is sucked in from the suction port 4b by the fan 6 and circulated in the direction of arrow A through the cold air circulation path 4, and the air is circulated through the cooler 7.
is cooled to become cooling air, and this cooling air flows through the air outlet 4.
A cold air is blown out from the opening 1a to form a cold air curtain 11 that blocks the inside 5 of the refrigerator from outside air, and cools the inside 5 of the refrigerator.

On the other hand, during the defrosting operation, the operation of the cooler 7 is stopped and the heater 8 is energized. The air sucked in by the fan 6 is heated by the heater 8, becomes heated air, and flows through the cold air circulation path 4, melting and removing frost on the cooler 7 and the like. When the heated air on the outlet side of the cooler 7 reaches a predetermined temperature, the defrosting thermometer 10 senses this and ends the defrosting operation.

[Problem to be solved by the invention]

By the way, in the conventional open showcase, during the defrosting operation, the heated air blown out from the air outlet 4a loses less heat as the defrosting progresses, and the temperature drops considerably just before the defrosting ends. Warmed air with a high temperature is blown out from the opening 1a, raising the temperature of the product inside the warehouse 5. As a result, the products spoil quickly, shortening the storage period and producing defective products.

An object of the present invention is to provide a cold air circulation type open showcase that can suppress the rise in product temperature during defrosting operation and prevent product loss.

[Means to solve the problem]

In order to achieve the above object, according to the present invention, a cold air circulation path is provided in a main body case having a substantially U-shaped cross section and having an opening on one side and forming a refrigerator interior inside. is equipped with a fan, a cooler, and a heater for defrosting the cooler disposed on the upstream side of the circulating cold air of the cooler, and the fan circulates the air inside the refrigerator through the cooler during cooling operation, and the air is circulated through the opening. In the cold air circulation type open showcase that blows out a cold air curtain to form a cold air curtain and cools the inside of the refrigerator, and during defrosting operation, warm air heated by the heater is circulated to defrost the fan. In addition to using a high/low variable speed fan, a cold storage body that stores cold air by circulating cold air during the cooling operation is placed in the cold air circulation path downstream of the circulating cold air of the cooler, and the cold storage body is removed further downstream of the cold storage body. A frost heater is installed, and during the defrosting operation, the fan is operated at high speed while the cooler defrosting heater is energized, and during the cooling operation, the cool storage body defrosting heater is energized and the The fan is operated in high-speed reverse rotation to defrost the cold storage body, and in some cases, the fan is operated at high speed during the defrosting operation for a longer time than the time when electricity is applied to the heater for defrosting the cooler. shall do so.

[Effect]

During defrosting operation, the defrosting time is accelerated by the high-speed rotation of the fan, and the heated air after washing the cooler is cooled by the cold storage body before being blown out into the refrigerator, thereby suppressing and preventing a rise in product temperature.゛Also, the cold storage body is defrosted by heated air during the cooling operation. This heated air is cooled by the cool storage body washing liquid post-cooler and becomes cooling air to cool the inside of the refrigerator.

〔Example〕

1 to 3 show embodiments of this invention,
Components common or identical to those in FIG. 6 are designated by the same reference numerals.

In FIG. 1, an air regulating fluid 9A or 9B is attached to the outlet 4a and the inlet 4b, respectively.

Further, the fan motor of the fan 6 is a reversible rotation motor and a variable speed motor. 15 is, for example, Nippon Light Metal Co., Ltd.
is a cold storage body sold under the trade name Chillfast, which stores cold energy by refrigerating it for an appropriate amount of time, and releases this cold energy at an appropriate time to cool the surrounding environment. This cool storage body 15 is installed in the cold air circulation path 4 and between the cooler 7 and the blower outlet 4a. Reference numeral 16 denotes a heater for defrosting the cold storage body disposed in the cold air circulation path 4 between the cold storage body 15 and the outlet 4a.

In the above-described configuration, the heater 8 and the heater 16 are de-energized, and the fan 6 is operated at low speed forward rotation to perform a cooling operation as in the conventional case, and the interior 5 of the refrigerator is cooled. During this cooling operation, the cold storage body 15 is washed by the cooling air flowing in the direction of arrow A through the cold air circulation path 4 and cooled by the cooler 7, and at this time, cold heat is taken from the circulating cold air and stored.

On the other hand, during defrosting operation, the heater 8 is energized, and the fan 6 is operated at high speed forward rotation during the time when the heater 8 is energized. Thus, the heated air heated by the heater 8 flows in the direction of arrow A and defrosts the cooler 7. At this time, a large amount of outside air is sucked in from the suction port 4b by the high speed rotation of the fan 6, promoting the defrosting and shortening the defrosting time compared to the conventional case. Furthermore, it retains the backward residual heat that has been washed away from the cooler 7 and
The heated air heading towards the
Blow out from a.

Figure 2 shows the heated air blowing temperature T2 and defrosting time in this invention compared to the blowing hot water temperature T and defrosting time t in the conventional system, both of which have been significantly reduced. As a result, the temperature rise inside the refrigerator 5 is suppressed to a much smaller level.

If frost forms on the surface of the cold storage body 15, the cold storage effect will be impaired, so it is necessary to remove the frost while cooling the inside 5. Defrosting of the cold storage body 15 is carried out as follows. be exposed. That is, while the cooler 7 is operating, the fan 6 is operated at high speed in reverse rotation, and the heater 16 is energized. A large amount of air sucked into the cold air circulation path 4 from the outlet 4a by the high-speed reverse rotation of the fan 6 is heated by the heater 16, washes the cool storage body 15, and melts and removes frost on the cold storage body 15. do. The air after this cool storage body washing liquid is cooled by the cooler and blown out from the suction port 4b, forming an air curtain lla in the opposite direction to the cold air curtain 11 at the opening 1a. The defrosting thermometer 10 senses the temperature of the air that has washed over the cold storage body 15, the power to the heater 16 is cut off, the fan 6 is switched to low-speed forward rotation operation, and the open showcase shifts to normal cooling operation. . Even if the air that has been washed through the cold storage body 15 has some amount of heat before switching to the normal cooling operation, the air blown out from the suction port 4b is kept at a low temperature by being cooled by the cooler 7. , and due to the increase in air volume due to high-speed operation of the fan 6, the cool storage body 15
Since the defrosting is carried out in a short time, it does not affect the cold storage of the products in the refrigerator.

FIG. 3 shows the cooling operation, the defrosting operation, and the fan 6 and cooler 7 during the defrosting of the cold storage body 15 performed during the cooling operation.
, which illustrates the operation of the heater 8.6 as a time chart.

Figures 1 and 5 show another embodiment of the invention,
3A and 3B are diagrams corresponding to FIGS. 2 and 3 of the above-described embodiment, respectively; FIG.

This embodiment differs from the previous embodiment in that the high-speed operation time of the fan 6 during defrosting operation is made longer than the energization time of the heater 8 by an appropriate amount of time, as shown in FIG. As a result, as shown in FIG. 4, the pull-down time t in the previous embodiment becomes the pull-down time t4 in this embodiment, which has the added advantage of being considerably shortened.

〔Effect of the invention〕

According to this invention, a reversible rotation and variable speed fan is used for the fan that circulates cooling air and sends defrosting air to the cooler, and cool air is stored in the cold air circulation path by circulating cold air during the cooling operation. A cold storage body is installed downstream of the circulating cold air of the cooler, and a heater for defrosting the cold storage body is installed further downstream of the cold storage body, and while the heater for defrosting the cooler is energized during the defrosting operation. The fan is operated at high speed rotation, and during the cooling operation, the heater for defrosting the cool storage body is energized, and the fan is operated at high speed reverse rotation to defrost the cool storage body. During defrosting operation, the fan operates at high speed for a longer time than the time when electricity is applied to the cooler's defrosting heater, so the defrosting time is shortened and heated air for defrosting is blown into the refrigerator. By being cooled by the cold storage body before taking out, the rise in temperature inside the warehouse during defrosting operation is significantly suppressed, and product loss can be prevented. Further, the cold storage body is defrosted without affecting the cold storage inside the refrigerator during the cooling operation, and always efficiently stores cold and effectively cools the warmed air after the cooler is defrosted.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an open showcase showing an embodiment of the present invention, Fig. 2 is a diagram comparing the temperature of the blown air during defrosting operation and the defrosting time, and Fig. 3 is a diagram showing a comparison between the open showcase and the open showcase. The showcase time charts, FIGS. 4 and 5, show other embodiments of the present invention, with FIG. 4 being a diagram corresponding to FIG. 2, and FIG. 5 being a time chart corresponding to FIG. 3. The chart, FIG. 6, is a sectional view of a conventional open showcase. 1...Main body case, 4...Cold air circulation path, 5...Inside the refrigerator, 6...Fan, 7...Cooler, 8...Cooler defrosting heater diagram

Claims (1)

[Scope of Claims] 1) A cold air circulation path is provided in the main body case, which has an opening on one side and has an approximately U-shaped cross section and forms the inside of the refrigerator, and a fan, a cooler, and a cooler defrosting heater disposed on the upstream side of the circulating cold air of the cooler, and the fan circulates the air inside the refrigerator through the cooler during cooling operation and blows out a cold air curtain to the opening. In the cold air circulation type open showcase, which cools the inside of the refrigerator and defrosts by circulating heated air heated by the heater during defrosting operation, the fan uses a reversible rotation and variable speed fan. At the same time, in the cold air circulation path, a cold storage body that stores cold by the circulating cold air during the cooling operation is installed downstream of the circulating cold air of the cooler, and a heater for defrosting the cold storage body is installed further downstream of the cold storage body. During the defrosting operation, the fan is operated at high speed while the heater for defrosting the cooler is energized, and during the cooling operation, the fan is rotated at high speed in reverse while the heater for defrosting the cold storage body is energized. A cold air circulation type open showcase, characterized in that the cool air circulation type open showcase is operated at a temperature of 100 kW to defrost the cold storage body. 2) A cold air circulation type open showcase according to claim 1, in which the fan is operated at high speed during defrosting operation for a longer time than the time when electricity is supplied to the defrosting heater of the cooler.