JPH0519738Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an open show case, and in particular,
Place a cold air curtain on the outside of the front opening.
It relates to an open case that forms a cold air curtain inside.

[Conventional technology]

One of this type of open case is equipped with a refrigeration system and a blower, and between the insulating wall and the inner box,
There is a wind passage (hereinafter referred to as non-chilled air passage) for forming a cold air curtain (hereinafter referred to as uncooled air curtain) on the outside of the front opening, and a cold air curtain (hereinafter referred to as non-chilled air passage) on the inside of the front opening. BACKGROUND ART There is a so-called double air curtain type open show case that has a wind passage (hereinafter abbreviated as a cold air passage) for forming a cold air curtain (hereinafter abbreviated as a cold air curtain). Furthermore, there is also known a system in which two evaporators are arranged in the cold air passage, and at least one of the evaporators is always used for cooling operation, so that the inside of the refrigerator is always kept cool.

An example of a refrigeration system used in the above-mentioned open shower case is shown in FIG. 5 along with its installation location.

In FIG. 5, reference numeral 11 denotes a compressor, and a condenser 12 is connected to the outlet side of the compressor, and these are arranged in a unit chamber 20 below the heat insulating wall. The outlet side of the condenser 12 has three terminals, and each terminal is connected to a solenoid valve 13a, 13b, 13c, respectively. Furthermore, the solenoid valve 13a on the left side in the figure is the first solenoid valve 13a.
The right solenoid valve 13c is connected to the inlet side of the second evaporator 14b. Between the solenoid valves 13a and 13b and the solenoid valve 13
Check valves 15a and 15b facing leftward and rightward, respectively, are provided between b and 13c, and solenoid valve 13a
and the check valve 15a, the solenoid valve 13c and the check valve 1
5b, expansion valves 16a and 16b are provided respectively. A solenoid valve 13d is provided on the outlet side of the first evaporator 14a and the second evaporator 14b, respectively.
13e is connected, and the solenoid valves 13d and 13e are connected to the inlet side of the compressor 11. Further, the outlet sides of the first and second evaporators 14a and 14b are connected through a pair of check valves 15c and 15d facing each other, and a solenoid valve 13b is connected between the check valves 15c and 15d. ing. Here, compressor 1
1. Condenser 12 and two evaporators 14a, 14b
The part including the valves excluding the above will be referred to as the refrigerant piping unit. This refrigerant piping unit and the two evaporators 14a and 14b are arranged within the cold air passage 30.

In such a configuration, for example, the evaporator 14a
When defrosting the evaporator 14b by performing a cooling operation, the solenoid valves 13a, 13b, and 13e are turned off.
It is sufficient to turn on the solenoid valves 13c and 13d. At that time, the gaseous refrigerant leaving the compressor 11 is transferred to the condenser 12.
This liquid refrigerant passes through the electromagnetic valve 13c and reaches the evaporator 14b. Then, the evaporator 14b is defrosted, the check valves 15d and 15a, and the expansion valve 16 are defrosted.
a, the evaporator 14a performs cooling, and the solenoid valve 13
d and returns to the compressor 11.

[Problem that the invention attempts to solve]

Conventionally, the refrigerant piping unit is installed in the cold air passage 30, so when one of the evaporators performs defrosting, the high temperature liquid refrigerant exiting the condenser 12 is transferred to the evaporator to be defrosted. The refrigerant is cooled in the piping section of the refrigerant piping unit before entering the container, and its heat is lost. For this reason, the defrosting time becomes longer, and as a result, the cooling operation time using only one of the evaporators becomes longer, and the temperature inside the refrigerator increases, leading to an increase in the temperature of the products inside the refrigerator. Furthermore, if the piping section is located inside the cold air passage 30, it becomes a resistance of the cold air passage 30, and the temperature inside the cold air passage 30 is lowered by the high temperature refrigerant discharged from the condenser 12 during defrosting as well as during cooling operation. There is also the disadvantage that the cooling performance decreases because the inside temperature also rises.

[Means for solving problems]

As shown in FIG. 1, the present invention allows the piping section of the refrigerant piping unit of the refrigeration system from the outlet side of the condenser 12 to the inlet side of the evaporators 14a and 14b at least during defrosting to be connected to a non-cold air passage. It is characterized by being arranged within 40. Note that the refrigerant piping unit may be installed within the non-cold air passage 40, as shown in FIG.

[Effect]

The high-temperature liquid refrigerant for defrosting that exits the condenser 12 passes through the non-cold air passage 40 before entering the evaporator where it is to be defrosted, so that the high-temperature liquid refrigerant is defrosted without being cooled. defrosting of this evaporator can be quickly completed.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 3 is a side cross-sectional view showing an example of the overall configuration of an open show case to which the present invention is applied, and Fig. 4 shows an example in which a refrigeration system is arranged in the open show case of Fig. 3 as shown in Fig. 2. FIG. 3 is a perspective view showing in detail a portion of the refrigerant piping unit shown in FIG.

Heat insulating panels 50 are arranged on the top, back, bottom, and side surfaces of the open show case, forming a top wall 50a, a back wall 50b, a bottom wall 50c, and a side wall 50d, respectively. An inner box 52 is provided inside the refrigerator to form an air passage along the top wall 50a, back wall 50b, and bottom wall 50c. The air passages in the top wall part 50a and the bottom wall part 50c are divided into two layers, upper and lower, with a cold air passage 30 and a non-cold air passage 4, respectively.
0 is formed. The air passage on the back wall portion 50b side is
It is divided into three by a partition wall 52 in the direction of the side wall portion 50d, and a cold air passage 30 is provided in the center thereof, and non-cold air passages 40 are provided on both sides thereof.

The front opening of the open show case is provided with inner and outer air outlets 54a and 54b and inner and outer suction ports 55a and 55b. As shown in the figure, the non-chilled air curtain 56b is connected to the non-chilled air passage 40.
Air is circulated from the outer air outlet 54b through the outer air suction port 55b and the non-cold air passage 40 by a blower (not shown) attached to the inner air blower mounting plate 57b. Further, the cold air curtain 56a cooled by heat exchange between the evaporators 14a and 14b is discharged from the inner air outlet 54a as shown in the figure by the blower 58a attached to the blower mounting plate 57a in the cold air passage 30. It circulates through the inner suction port 55a and the cold air passage 30. In addition, as shown in the figure, shelf boards 59 and net shelves 60 are provided in the warehouse to display products. Furthermore, the blower mounting plate 57
A damper drive box 63 for driving a damper 63a that controls opening and closing of the cold air passage 30 is installed between the evaporator 14a and the evaporator 14a.

Furthermore, at the lower part of the back wall portion 50 of the non-cold air passage 40, as shown in the figure, a
A refrigerant piping unit is provided for connecting the evaporators 14a and 14b of the base and the compressor 11 and condenser 12 installed in the unit chamber 20 at the lower part of the bottom wall 20 of the heat insulating panel 50. .

In this way, the refrigerant piping unit connects to the non-cold air passage 4.
0, the high-temperature liquid refrigerant for defrosting that exits the condenser 12 is guided to the evaporator where defrosting is to be performed without being cooled, and the defrosting of the evaporator is promptly completed. can be done. Further, in this embodiment, the refrigerant piping unit is connected to the evaporators 14a and 14.
Since they are grouped together in a small space near b,
The wind resistance of the non-cold air passage 40 can be reduced, and the air volume of the non-cold air curtain 56b is not reduced.

In the above embodiment, all the refrigerant piping units are arranged in the non-cold air passage 40, but as shown in FIG. 1, at least the outlet of the condenser 12 during defrosting is The piping portion from the side to the inlet side of the evaporators 14a, 14b may be arranged within the non-cold air passage 40.

[Effects of the invention] As is clear from the above explanation, according to the invention, at least the piping section from the outlet side of the condenser to the inlet side of the evaporator during defrosting is arranged in the non-cold air passage. This has the advantage that defrosting of the evaporator can be completed quickly and the rise in product temperature can be kept to a minimum. In addition, since the above piping section is placed in a non-cold air passage,
Another advantage is that it can improve cooling performance by solving the problems of air blow resistance and temperature rise.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the relationship between an embodiment of the refrigeration equipment used in an open show case and the installation location according to the present invention, and Fig. 2 is a diagram showing the relationship between the refrigeration equipment used in the open show case and the installation location according to the invention. A diagram showing the relationship with another embodiment, FIG. 3 is a side sectional view showing an example of the overall configuration of an open show case to which the present invention is applied, and FIG. 4 is the open show case of FIG. 3. Figure 2 is a detailed perspective view of a refrigerant piping unit showing an example of refrigeration equipment arranged as shown in Figure 5. Figure 5 shows the relationship between the refrigeration equipment used in an open shower case and its conventional installation location FIG. 11...Compressor, 12...Condenser, 13a-1
3e... Solenoid valve, 14a, 14b... Evaporator, 1
5a to 15d... Check valve, 16a, 16b... Expansion valve, 20... Unit chamber, 30... Cold air passage,
40...Non-cold air passage.

Claims (1)

[Claims for Utility Model Registration] 1. A first air curtain comprising a refrigeration device and a blower for forming a first air curtain that is not cooled at least outside the front opening between the heat insulating wall and the inner box.
and a second air passage for forming a chilled second air curtain inside the front opening, and the refrigeration apparatus has two air passages disposed in the second air passage. an evaporator, a compressor and a condenser disposed in the unit room at the bottom of the heat insulating wall, and a connection between the two evaporators, the compressor and the condenser, and simultaneous cooling by the two evaporators. or a refrigerant piping unit having a valve for mutually performing defrosting and cooling; An open show case characterized in that a piping section of a piping unit is disposed within the first air passage. 2. The open show case according to claim 1, wherein the refrigerant piping unit is disposed within the first air passage.