JPH0534046A - Around refrigerated open chow case - Google Patents

Abstract

(57) [Abstract] [Purpose] The inside of the case body having openings on the front and both sides is divided by a duct plate into a product storage connected to the openings and a cold air circulation duct in which a fan and a cooler are arranged.
In an around-type refrigerating open showcase in which the ends of the cold air circulation duct face the upper and lower sides of the opening as the outlet and inlet of the cold air curtain, the refrigerant pipe is divided into two systems and the defrosting time of each system is shifted. Thus, by constantly performing the cooling operation, it is possible to efficiently maintain the internal cold storage temperature without stopping the cooling operation more than necessary. [Structure] The cooler comprises a front opening cooler 9b and side opening coolers 9a and 9c, and a solenoid system 16a, 16b is provided here by dividing the piping system to each of these coolers.
The off time for defrosting the cooler when opening and closing the solenoid valves 16a and 16b is set so as not to completely overlap.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an around-type refrigerating open showcase among refrigerating open showcases capable of keeping the temperature inside the refrigerator at an appropriate temperature at all times.

[0002]

2. Description of the Related Art As shown in FIG. 4, an around type refrigerating open showcase has an opening 2 on the front surface and both side surfaces for taking out a product. The opening 2 is a showcase body made of a heat insulating wall. 1, the inside of the case body 1 is divided by a duct plate 3 into a product storage 4 communicating with the opening 2 and a cold air circulation duct 7, and a partition plate further inside than the cold air circulation duct 7 is formed. It is divided by 6 to form a protective airflow duct 8.

Of these, a cooler 9 and a blower 10 are provided in the cold air circulation duct 7, and a blower 11 is provided in the protective airflow duct 8, and the ends of the cold air circulation duct 7 and the protective airflow duct 8 are provided with an opening 2. Is made to face as the air outlet 12 at the upper part and as the suction port 13 at the lower part. 14 in the figure is a product storage 4
Drain boards 5 provided at the bottom of the display rack are display shelves provided in the product storage 4.

In this way, the cool air cooled by the cooler 9 in the cool air circulation duct 7 is caused to flow from the blower outlet 12 to the suction inlet 13 by the blower 10 to form the cool air flow curtain A in the opening 2. Then, this cools the inside of the product storage 4 and causes the air flow in the protective air flow duct 8 to flow from the blower outlet 12 to the suction port 13 by the blower 11, so that a protective air flow air curtain is provided outside the air curtain A. B is formed, and the cold air inside the product storage 4 is protected by these air curtains A and B.

By the way, in the around type open showcase, the entire peripheral surface except the back surface is the opening 2, and the opening is wide, so that the temperature inside the product storage 4 easily rises. Therefore, as shown in FIG. 5, the cooler 9 is the left cooler 9
a, a central cooling device 9b, and a right cooling device 9c, and the blower 10 includes a left blower 10a and a central blower 10.
b, the blower 10c, and the right blower 10d.

As shown in FIG. 7, in the refrigerant piping system, the cooler 9a, the cooler 9b, and the cooler 9c are connected in parallel with each other, and one solenoid valve 1 is provided in the liquid pipe 19 on the inflow side thereof.
6 and one expansion valve 18 are provided, and the return side is joined as a return pipe 20.

Further, as shown in the control circuit in FIG. 6, a series connection circuit of a timer contact 17a, a temperature controller 15 and a solenoid valve 16 is connected in parallel to a defrosting timer 17.

In this way, the solenoid valve 16 is opened and closed by the operation of the temperature controller 15 during the cooling operation.
Thus, the refrigerant flowing to the coolers 9a, 9b, and 9c is controlled to be turned on / off to keep the temperature inside the refrigerator at an appropriate temperature. Also, when defrosting, the timer contact 1 is set by the timer 17.
7a is opened to cut off the circuit, and off-cycle defrosting is performed by operating only the blower 10. Even if the defrosting of the timer 17 is completed, the timer contact 17a
It did not close immediately and continued to defrost within a set time.

When the set time has passed, the timer 17 closes the timer contact 17a to perform the cooling operation again. However, even if the defrosting ends, the defrosting is continued within one set time. The internal temperature of the product storage 4 rises, so that the temperature controller 15 further intensifies the cooling operation in order to return the internal temperature to the original low temperature.

[0010]

In particular, an around refrigerating showcase has a wider opening than a normal refrigerating showcase and is liable to frost, so defrosting is often required.
As described above, in the conventional around refrigeration showcase, since the refrigerant control is performed by one system, all the coolers can be stopped during defrosting, and even if the defrosting is completed, the cooling is continued for a certain period of time. Since the operation does not start, the temperature inside the refrigerator is likely to rise, which may impair the freshness of the product.

An object of the present invention is to eliminate the disadvantages of the above-mentioned conventional example, and when performing defrosting, an around refrigeration system capable of efficiently maintaining the inside temperature of the refrigerator without stopping the cooling operation more than necessary. To provide an open showcase.

[0012]

In order to achieve the above object, the present invention provides a cold air circulation duct in which a case for storing a commodity, a fan and a cooler which are connected to the opening by a duct plate in a case body having the opening. This is a refrigerated open showcase in which the ends of the cold air circulation duct face the upper and lower sides of the opening as the outlet and inlet of the cold air curtain, and the opening, outlet and inlet are formed on the front and both sides. In the around type refrigerating open showcase, the cooler comprises a cooler for front opening and a cooler for side opening, and a solenoid valve is provided here by dividing a piping system to each cooler. The gist is to set the defrosting off-times of the cooler when the valves are opened and closed so that they do not completely overlap.

[0013]

According to the present invention, the refrigerant pipe is divided into two systems, the front opening cooler and the side opening cooler, so that the defrosting time of the cooler is further shifted in each system. , Defrosting is performed alternately for each system, and cooling operation is always performed. As a result, the temperature inside the refrigerator can be prevented from rising and the temperature inside the refrigerator can be efficiently maintained.

[0014]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a refrigerant piping diagram showing an embodiment of an around refrigerating open showcase according to the present invention, in which the same components as those of the conventional example shown in FIG. 7 are designated by the same reference numerals.

The liquid pipe 19 is branched into two systems X and Y, one system X is connected to a central cooler 9b via a solenoid valve 16a and an expansion valve 18a, and the other system Y is an electromagnetic system. The left and right coolers 9a and 9c are connected via a valve 16b and an expansion valve 18b.
On the outflow side, a and 9c were joined to the return pipe 20. Furthermore, the defrosters end thermostats 23 and 24 are provided in the coolers 9a and 9b, respectively.

FIG. 2 is a control circuit diagram, in which a contact 25b of the auxiliary relay 25, a temperature controller 15a and a series connection circuit of a solenoid valve 16a are connected in parallel to the defrosting timer 17, and the timer of the timer 17 is also connected. Although the contact 17a is a C contact, one of the contact 17a and the defrosting thermo 23
The parallel connection circuit of the contact point 23a of the auxiliary relay 25 and the contact point 25a of the auxiliary relay 25 and the series connection circuit of the auxiliary relay 25 are connected in parallel to the timer 17.

The other of the contacts 17a is connected to the middle point of the contact 25b and the temperature controller 15a, and the auxiliary timer 2
1 is connected to this contact 17a, and the auxiliary timer 21
Is connected in parallel to the temperature controller 15a and the solenoid valve 16a.

On the other hand, with respect to the defrosting timer 17,
The series connection circuit of the contact 26b of the auxiliary relay 26, the temperature controller 15b, and the solenoid valve 16b is connected in parallel, and the timer contact 21a of the timer 21 is the C contact. One of this contact 21a and the defrosting thermostat 24 are connected. A parallel connection circuit of the contact 24 a and the contact 26 a of the auxiliary relay 26 and a series connection circuit of the auxiliary relay 26 are connected in parallel to the timer 17. The other of the contacts 21a is connected to the middle point of the contact 26b and the temperature controller 15b.

Next, the operation will be described. During normal operation, the liquid refrigerant introduced by the liquid pipe 19 is 2 in FIG.
It is branched into two systems X and Y, and one system X is a solenoid valve 16
a, the pressure is reduced by the expansion valve 18a, and the central cooler 9b
Flow into. Similarly, the other system Y also enters the solenoid valve 16b, is decompressed by the expansion valve 18b, and is cooled on both sides by the coolers 9a, 9a.
flows into c. And each cooler 9a, 9b, 9c
Defrost to remove the frost on the surface.

In FIG. 2, the temperature controller 1 is used during the cooling operation.
The solenoid valves 16a and 16b are controlled by opening and closing 5a and 15b. At the time of defrosting, the contact 17a is switched by the timer 17 to turn on the power supply of the defrosting circuit, and the solenoid valve 16
When the temperature of the cooler 9b reaches the defrosting end temperature while the a is not energized and the off-cycle defrosting is performed, the defrosting end thermo 2
3 detects this, the contact 23a is closed, and the auxiliary relay 25
Energize. When the auxiliary relay 25 is energized, the contact 25b
Also, the solenoid valve 16a is energized to restart the cooling operation.

The contact 23a opens when the defrosting end thermostat 23 is cooled below the defrosting end set temperature after restarting the cooling operation, but since the auxiliary relay 25 and the contact 25a form a closed circuit, the contact 25b also. It is closed and cooling operation is continued. Further, when the timer 17 exceeds the set time, the contact 17a is switched to return to the operation circuit and the cooling operation is continued, but the auxiliary relay 25 of the defrost circuit and its contacts 25a and 25b are open circuits.

At the same time, the auxiliary timer 21 causes the contact 21a.
Even when the switch is turned on, the power supply of the other defrosting circuit is turned on, the solenoid valve 16b is de-energized, and off-cycle defrosting is performed. Then, when the temperature of the cooler 9a reaches the defrosting end temperature, the defrosting end thermo 24 detects this and contacts the contact 24.
a closes the auxiliary relay 26 and its contact 26a to form a closed circuit, and the other contact 26b of the operating circuit
Closes and restarts the cooling operation.

After the defrosting-completed thermostat 24 restarts the cooling operation,
The contact 24a opens when cooled to a temperature equal to or lower than the defrosting termination set temperature, but the cooling operation is continued because the auxiliary relay 26 and the contact 26a form a closed circuit. When the auxiliary timer 21 has passed the set time, the contact 21a is switched to return to the operation circuit, and the cooling operation is continued. The above operation is repeated when the timer 17 is set.

[0024]

As described above, in the around type refrigerating showcase of the present invention, the refrigerant pipe is divided into two systems, that is, the front opening cooler and the side opening cooler.
By further shifting the defrosting time of the cooler in each system, defrosting is performed alternately for each system, and cooling operation is always performed. As a result, the temperature inside the refrigerator can be prevented from rising and the temperature inside the refrigerator can be efficiently maintained.

[Brief description of drawings]

FIG. 1 is a refrigerant piping diagram showing an embodiment of an around refrigerating showcase of the present invention.

FIG. 2 is an operation control circuit diagram showing one embodiment of the around refrigerating showcase of the present invention.

FIG. 3 is a vertical sectional side view of an around refrigerated showcase.

FIG. 4 is an external perspective view of an around refrigerated showcase.

FIG. 5 is a cross-sectional plan view of an around refrigerated showcase.

FIG. 6 is a refrigerant piping diagram showing a conventional example.

FIG. 7 is an operation control circuit diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Showcase main body 2 ... Opening part 3 ... Duct board 4 ... Merchandise storage 5 ... Display shelf 6 ... Partition plate 7 ... Cold air circulation duct 8 ... Protective air flow duct 9, 9a-9c ... Cooler 10, 10a-10d ... Blower 12 ... Blowout port 13 ... Suction port 14 ... Drainboard 15,15a, 15b ... Temperature controller 16,16a, 16b ... Electromagnetic valve 17 ... Timer 17a ... Timer contact 18,18a, 18b ... Expansion valve 19 ... Liquid pipe 20 ... Return pipe 21 ... Auxiliary timer 21a ... Contact 23, 24 ... Defrost removal thermo 23a, 24a ... Contact 25.26 ... Auxiliary relay 25a, 25b, 26a, 26b ... Contact A ... Cold air curtain B ... Protective air curtain X ... Piping system Y ... Piping system

Claims (1)

Claim: What is claimed is: 1. A case main body having an opening is partitioned by a duct plate into a product storage connected to the opening and a cold air circulation duct in which a fan and a cooler are arranged. A refrigerated open showcase in which the duct end faces the upper and lower sides of the opening as the outlet and inlet of the cool air curtain, and the opening, outlet and inlet are formed on the front and both sides in an around-type refrigerated open showcase. The cooler is composed of a front opening cooler and a side opening cooler, a piping system for each of these coolers is divided, and a solenoid valve is provided here. Around-type refrigerated open showcase characterized by being set so that the defrosting off-time does not completely overlap.