JPS6183861A - Method of operating low-temperature showcase - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method of operating a forced circulation type low temperature showcase equipped with a blower capable of forward and reverse rotation.

(b) The conventional low-temperature cooling case of Technical Utility Model Publication No. 43-23802 (70B18) and Japanese Unexamined Patent Publication No. 47-44346 (70B42) is equipped with a cooler and a blower in the passage, and during cooling operation, the cooler The cold air that has been heat exchanged is forcedly circulated with the blowout low open low suction low cold air passage using a blower to form a cold air curtain at the opening to cool the storage room. During frost operation, outside air is passed through the defrosting heater of the cooler, and the outside air is introduced into the passage from the air outlet, and after passing through the cooler, it is blown out diagonally upward from the suction opening, and the heat of the defrosting heater is absorbed. Efforts are made to ensure that energy does not affect the storage room.

(c) Problems to be Solved by the Invention In the above-mentioned prior art, a large temperature difference occurs between the cold air curtain formed at the opening during cooling operation and the outside air. Due to the strong outside air entrainment effect of the flow, a large amount of outside air and the moisture contained in this outside air enters the air curtain, resulting in an increase in the amount of frost formed on the cooler per hour, and cooling A problem arose that the driving time was shortened. In addition, even during the 1-6 operation, the thermal energy of the radiant heat of the defrosting heater of about 600W is transmitted to the partition plates that define the storage room and heats the partition plates, so the storage compartments are displayed near the partition plates. There was also the problem that the temperature of the stored items would rise and the quality would deteriorate.

B) Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a heating element a that constantly generates heat on the communication path side of the rectifier α disposed at the air outlet (9).
Opening (2) for storing and taking out items during cooling operation.
The outer flow of the cold air curtain (AC) formed in
The cold air that becomes AC3) is heated by the heating element, and is also introduced into the passage αILK from the air outlet (9) during defrosting operation to the cooler (7).
This is a method of operating a low-temperature showcase in which outside air is heated by the heating element.

(E) The action heating element 0D allows the air curtain (AC
The outside flow (AC3) of ) becomes dry cold air, and the outside air introduced along the path αINK at the time of unreliable operation becomes warm air.

(to) Example The present invention will be described in detail based on the drawings below.
) is a flat low-temperature seam whose main body is made up of an insulating wall (3) with an opening (2) for storing and taking out products on the top surface.
It is a case. The heat insulating wall has a transparent window (4) made of glass erected on the upper part of the front wall (3A), and a bumper rail (5) is installed along the front lower part of the transparent window. (3B) An apron (
3C). (6) is a partition plate placed at an appropriate distance from the inner wall of the heat insulating wall, and along with the arrangement of this partition plate, a great fin type cooler (7) and an axial flow blower capable of forward and reverse rotation are installed. A heat insulating wall (3) connects a passage α1) in which (8) is stored and one end is opened forward to form an air outlet (9) and the other end is opened upward to form a suction port Oω and a storage chamber Cl21. form within. Front wall of the partition plate (6A)
A transparent plate a3 is erected on the top of the storage compartment a4, which allows the storage compartment a4 to be viewed from the outside together with the transparent window, and substantially raises the load line of the storage compartment a4. (2) is a flow straightening device such as a honeycomb material placed at the air outlet, and α9 is the same air outlet (91K is arranged, and the opening (2) is larger than the airflow outlet).
This is a lattice member located on the side. The housing block is a product drop prevention member such as punched metal or a net placed below the suction port. (171 is a heating element such as a 40W electric heater placed near the side of the passage (II) of the rectifier,
Low-temperature showcase] 1) related to both cooling and defrosting operations (
I have a fever all the time. During cooling operation, the low-temperature showcase rotates the blower (8) in the forward direction to forcefully circulate the cold air that has been heat-exchanged in the cooler (7) to the opening (2) as shown by the solid line arrow in Figure 2. During defrosting operation, which forms an air curtain (AC) and stops the refrigerant supply to the cooler (7), the blower (8) is rotated in the opposite direction to flow air (outside air) as shown by the chain line arrow in Figure 2 for cooling. Perform division 1■ of vessel (7).

The rectifying device has a large number of rectangular or circular μ flow paths (18A) to (18H). The dimensions of this rectifying passage become progressively longer from the seventh inner part (18A) to the outer part (18H), and the velocity of the air curtain (AC) has a gradient during cooling operation. That is, the first
As shown by the arrows (ACI) (AC2) (AC3) in the figure, the speed decreases in order from the inner flow (ACI) to the intermediate flow (AC2) and the outer flow (AC3) of the air curtain (AC). The cold air that becomes the outer flow (AC3) of the air curtain is heated by a heating element an just before it flows into the rectifier αe, and the cold air has a lower temperature than the outside air and forms an inner flow (ACl) and an intermediate flow (AC2). It becomes dry, cold air with a higher temperature. During defrosting operation, the heating element heats the outside air introduced from the outlet (9) into the passage 01). Incidentally, α1 is a direction plate that directs cold air toward the rectifier path (18H) of the rectifier (141) during cooling operation.

Therefore, according to the operating method of the low-temperature showcase fl), the flow outside the air curtain (AC) ( Since the cold air that becomes AC3) cannot be heated to dry cold air, it is possible to reduce the temperature difference between the outside flow (AC3) and the outside air and reduce the amount of moisture entering the air curtain (AC)7. , As a result, the amount of layer deposited per hour in the cooler (7) can be reduced.
During defrosting operation, the heating element (17) heats the outside air, so the heating element itself is used as an auxiliary heat source and the heat valley f on the heating element side
ii' Since the ice is so small, it is not possible to raise the temperature of the partition plate (6) and the stored products using its thermal energy.

(g) Effects of the invention According to the present invention, the following effects are achieved.

■During cooling operation, the cold air that flows outside the air curtain is
Since the air can be heated with a heating element to produce dry, cool air, the amount of moisture entering the air curtain can be reduced, and the wear rate of the cooler per hour can be reduced.

■During defrosting operation, the temperature of the outside air can be raised by heating the outside air with a heating element serving as a heat source, so the defrosting time of the cooler is shortened.

[Brief explanation of the drawing]

The drawings all show an embodiment of the method of operating the low-temperature showcase of the present invention, and FIG. 1 is an enlarged vertical cross-sectional view of the main part of the showcase;
FIG. 2 is an overall vertical sectional view of the showcase. (2)...opening, (sword...cooler, (8)...
・Blower, (9)...Blowout outlet, (Ill...Aisle, (12+...Storage room, Living room...Rectifier, a)
'7)...Heating element, (AC3)...Outside flow.

Claims (1)

[Claims] 1. In a low-temperature showcase in which a cooler and a blower capable of forward and reverse rotation are housed in a passageway and the direction of air passing through the cooler is changed during both cooling and defrosting operations, a rectifier placed at the outlet. A heating element is provided on the aisle side, and the cold air, which flows outside the cold air curtain formed at the opening for storing and taking out products during cooling operation, is heated by the heating element and introduced into the aisle from the outlet during defrosting operation. A method of operating a low-temperature showcase in which the heating element heats outside air that reaches the cooler.