JPS6277576A - 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] [Technical Field of the Invention] This invention provides a showcase for storing frozen foods, which is generally installed in stores that handle frozen foods such as ice cream, in a showcase having a cooling i1 function. are doing. This showcase has a refrigeration function, and examples thereof are shown in FIGS. 10 and 11.

In FIGS. 10 and 11, reference numeral 1 denotes a box-shaped showcase body with an opening at the top, and when a lid (for example, a plate-shaped transparent glass) 2.2 provided at the top opening is opened, an internal storage compartment 3 is opened. It is possible to take food in and out. An insulating frame 5 for thermal insulation is provided at the upper edge of the till wall 4 corresponding to the upper opening. Further, the side wall 4 is loaded with a heat insulating material (for example, urethane) 6, and a cooling vibe 7 is embedded in the heat insulating material 6 so as to be in contact with the inner surface of the side wall on the side of the storage 3. This cooling pipe 7 constitutes an evaporator of the refrigeration system provided in the lower part of the main body 1, and has the function of cooling the inside of the storage J@3 through the inner surface of the side wall by the evaporation action of the refrigerant passing through the inside. .

By the way, in such a showcase, frost S forms from the inside of the insulating frame 5 to the inner surface of the side wall due to the intrusion of outside air through the upper opening, and as the operation continues for a long time, the frost S gradually increases. This has the disadvantage of impairing the exhibition effect as a showcase and reducing the storage space. Furthermore, when the frost S grows to the top of the insulating frame 5, it becomes difficult to reliably open the lid 2, and cold air leaks from there, resulting in a decrease in cooling capacity.

For this reason, the adhered BS had to be scraped off with a spatula or knocked off with a bottle, etc., which required time and effort to maintain and manage, which was a heavy burden, especially for busy store staff. In the defrosting method described above, scratches and dents occur on the inside of the insulating frame 5 and the inner surface of the side walls.
In the worst case, the cooling vibrator 7 may be damaged and refrigerant may leak. Furthermore, frost scatters on various parts of the main body 1, which ultimately impairs the display effect.Furthermore, as shown by broken lines in FIG. 8, the frost S is prevented from developing on the upper part of the insulating frame 5 by the heat generated by the anti-frost heater 8, and the cover body 2 can be opened reliably. This resulted in excessive consumption, which was uneconomical.

(Object of the invention) This invention was made in view of the above circumstances.
The purpose of this is to be able to defrost reliably without requiring any human intervention, thereby ensuring a good display effect at all times and making effective use of storage space.
Moreover, it is an object of the present invention to provide a highly reliable showcase that can extend the life of the main body, improve its appearance, and also improve its cooling effect.

[Summary of the invention]

This invention provides a showcase in which a top opening of a storage is provided with a lid that can be opened and closed, and includes a refrigeration device having a first evaporator for cooling the storage and a second evaporator for frosting; a defrosting means for defrosting the second evaporator periodically or as needed; the second evaporator is provided along the opening periphery of the storage; A drain receiver is provided to receive the drain from the drain.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 4, reference numeral 11 denotes a box-shaped showcase body with an opening at the top, and when a lid provided at the top opening, such as a sliding transparent glass door 12. It is possible to take food in and out. A machine room 14 is formed in the lower part of the main body 1, and a refrigeration device 15 is provided in this machine room 14. Side wall 16 of main body 1
is loaded with a heat insulating material (for example, urethane) 17, and a cooling vibe 18 is embedded in the heat insulating material 17 so as to be in contact with the inner surface of the side wall on the storage 13 side. This cooling via 18 is
It constitutes the first evaporator of the above-mentioned freezer bag @15, and the storage compartment 1
It has the function of cooling the inside of 3.

An insulating frame 19 for thermal insulation is provided on the upper edge of the side wall 17, and the insulating frame 19 is provided with a rail 20 for sliding the above-mentioned 1912.12. Then, several frosting vibrator fittings (elastic material) 21 are attached to the inside of the insulating frame 19, that is, the surface on the storage 13 side, and the frosting vibrator 22 is attached to these fittings 21 along the opening periphery. It is fitted and installed. This frosting vibrator 22 is made of aluminum (extrusion molded) and constitutes the second evaporator of the refrigeration device 15, and is used to collect frost S intensively and forcibly. Note that the frosting vibrator 22 is integrally molded with fins 22a in order to enhance the frosting effect. Further, the rail 20 also serves as a guard to prevent hands from touching the frosting vibrator 22. Thus, in the insulating frame 19, a concave drain receiving portion 19a is formed below the attachment position of the frosting vibrator 22 (by vacuum forming, etc.).

This drain receiving portion 19a has an inclination that descends from approximately the center of the side wall 16 toward the four corners, and drain ports 23 are provided at positions corresponding to the four corners. The drain port 23 is connected to a drain pipe 24 extending to a drain tray (not shown) in the lower part of the main body 1. Further, a defrosting heater 25 is embedded in the heat insulating material 17 at a position in contact with the drain receiving portion 19a.

FIG. 5 shows the refrigeration device 15.

That is, a compressor 30, a condenser 31, a heat exchanger 32, a pressure reducing device such as a capillary tube 33
, a cooling vibrator 18 which is a first evaporator, and a check valve 3
4. The frosting vibrator 22, which is a second evaporator, and the heat exchanger 32 are successively connected to form a refrigeration cycle. Furthermore, 1! between the refrigerant discharge side of the compressor 30 and the cold IIK inflow side of the frosting pipe 22! A hot gas bypass cycle 36 is provided via a magnetic on-off valve 35. Here, the heat exchanger 32 is for preventing the refrigerant discharged from the condenser 31 from being overcooled and from returning to the compressor@30.

FIG. 6 shows the control circuit.

40 is a commercial AC power source, and the compressor motor 30M is connected to this power source 40 via a control switch 41. Further, a timer motor 42M of a defrosting timer 42 is connected to the electric motor m40 via a control switch 41. and,
Control switch 41. to power supply 4o. Defrost return thermo 43. and the above i! via the timer switch 42a in series. Connect the electromagnetic on-off valve 5. Furthermore, the electromagnetic on-off valve 35
The defrosting heater 25 is connected in parallel to the defrosting heater 25. Here, the control switch 41 responds to the output of a temperature sensor that detects the temperature inside the storage 13. The defrosting timer 42 turns on the timer switch 42a for a certain period of time (for example, 3 minutes to 5 minutes) every predetermined time period (for example, 3 hours to 5 hours) by the operation of a timer motor 42M.

The defrosting return thermostat 43 is installed at or near the frosting tube 18, and opens when the detected temperature exceeds a predetermined value.

Next, the operation in the above configuration will be explained.

When the power source 40 is turned on, the compressor motor 30M operates,
Compression 1130 is turned on. Compression I! 130 is turned on, the refrigerant is discharged from the compressor 1130 and is transferred to the condenser 31.130 as shown by the solid line in FIG. Heat exchanger 32. Capillary tube 33. Cooling vibe 18. @ Measurement pipe 22 and heat exchanger 32 are circulated in sequence. Then, the storage 13 is cooled through the inner surface of the side wall 16 due to the evaporation action of the refrigerant in the cooling vibe 18 and the frosting pipe 22 . In this way, when the temperature inside the storage [13] decreases, frost tends to adhere to the periphery of the upper opening due to the humidity of the outside air that enters through the upper opening. However, since the frosting pipe 22 is present at the periphery of the opening, the frost S is intensively and forcibly attached to the frosting pipe 122. Therefore, the inside or side v1 of the insulating frame 19
This prevents frost S from adhering to the inner surface of 6. in this case,
The temperature of the frosting pipe 22 is about 2 d higher than that of the cooling pipe 118.
It is designed in advance to have a low temperature of eg~5 degrees, thereby increasing the @frost effect on the frosting pipe 22.

On the other hand, the defrosting timer 42 is operating at the same time as the power supply 40 is turned on, and the timer switch 42a is turned on after a predetermined period of time has elapsed. When the timer switch 42a is turned on, the electromagnetic on-off valve 35 and the defrosting heater 25 are energized, the electromagnetic on-off valve 35 is opened, and the defrosting heater 2 is turned on.
5 operates to generate heat. When the electromagnetic on-off valve 35 opens, high-temperature refrigerant discharged from the compressor 30 is injected into the frosting pipe 22 via the hot gas bypass cycle 36. As a result, the frost S adhering to the frosting pipe 22 is removed. In this case, the presence of the check valve 34 prevents high-temperature refrigerant from entering the cooling pipe 18 and reducing the cooling capacity. Therefore, the drain generated by defrosting drips onto the drain receiving part 19a of the insulating frame 19, and the drain receiving part 1
The water is discharged from 9a through the drain vibrator 24 to a drain tray (not shown) below the main body 1, and is evaporated and removed by the heat generated by the heater provided there. At this time, since the defrosting heater 25 is operating to generate heat, the drain dripping into the drain receiver 19a does not freeze, and can be reliably discharged. Thereafter, when the defrosting progresses and the temperature sensed by the defrost return thermometer 43 becomes equal to or higher than a predetermined value, the defrost return thermometer 4 opens and the electromagnetic on-off valve 35 and the defrost heater 25 are de-energized. That is, the electromagnetic on-off valve 35 is closed and the supply of high temperature refrigerant to the frosting pipe is stopped. Thereafter, this defrosting operation is executed at predetermined time intervals measured by the defrosting timer 42.

In this way, the frost S is intensively and forcibly attached to the frost vibrator 22, and the attached snow S is periodically removed by injecting high-temperature refrigerant. This allows for a good display effect at all times.
The space inside can be used effectively. Furthermore, since the development of frost S on the upper opening can be prevented, the door 12 can be opened reliably, and the cooling effect can be improved. In particular, there is no need for manual defrosting work, so maintenance and
Management becomes easy and the burden on store staff can be reduced. Furthermore, scratches and dents are not caused on the inside of the insulating frame 19 and the inside of the side wall 16, which not only improves the lifespan and aesthetics but also avoids inconveniences such as damage to the cooling pipe 18 and leakage of refrigerant. can do. Further, since the defrosting heater 25 is energized only during defrosting, there is no needless consumption of power, which is economical.

In the above embodiment, if the insulating frame 19 is provided with a ventilation hole 19b as shown in FIG. 7, the outside air entering from the upper opening can be efficiently guided to the frosting pipe 22, thereby preventing frosting. The frost effect on the pipe 22 can be enhanced. Furthermore, a smooth air flow can be created within the storage 13, leading to an improvement in the cooling effect.

Further, in the above embodiment, the case where there is no condenser fan has been described, but if there is a condenser fan, the control circuit is configured as shown in FIG. 8.

That is, a relay 50 is connected in parallel to the electromagnetic on-off valve 35, and the condenser fan 51 is connected to the power source 4 through the relay contact (normally closed) and the control switch 41 in series.
Connect to 0. In this case, the condenser fan 5 is used only during defrosting.
1 operation stops.

Further, in this case, the defrosting heater 25 is directly connected to the power source 40 and is constantly energized.

Furthermore, the check valve 34 of the refrigeration device 15 and the frosting pipe 22
If a capillary tube is provided between the outlet side of the check valve 34 and the connection part of the hot gas bypass cycle 36, the temperature of the frosting pipe 2 can be made lower than the temperature of the cooling pipe 18. It is possible to lower the temperature by 10 degrees or more, which not only greatly improves the frosting effect on the frosting pipe 22 but also almost eliminates frosting on the cooling pipe 18.

In addition, as shown in FIG. 9, the refrigeration device 15 has a heat exchanger removed, a flow divider 60 and a capillary tube 61 are provided between the cooling pipe 18 and the frosting pipe 22, and a flow divider 60 and a capillary tube 61 are provided between the cooling pipe 18 and the frosting pipe 22. A bypass cycle 63 is connected to the suction side of the compressor 30 via an electromagnetic on-off valve 62.
may be provided. In this case, the presence of the capillary tube 61 is to enhance the frosting effect of the frosting pipe 22 and eliminate frost formation on the cooling via 18 as described above, and the presence of the capillary tube 61 is to enhance the frosting effect of the frosting pipe 22 and eliminate frosting on the cooling via 18. Solenoid on-off valve 62. The presence of the bypass cycle 63 is to prevent the cooling capacity from decreasing due to the provision of the capillary tube 61, and the electromagnetic on-off valve 62 is opened periodically by a timer.

In the above embodiment, the frosting pipe 22 is not limited to being made of aluminum, but may also be made of tonal material, and the fins 22a
It may be multiplexed. In addition, although the frosting pipe 22 is provided parallel to the opening periphery, the drain receiving portion 19 of the insulating frame 19
．． It may be made to have an inclination along a.

〔Effect of the invention〕

This invention was made in view of the above circumstances,
The purpose of this is to be able to defrost reliably without requiring any human intervention, thereby ensuring a good display effect at all times and making effective use of storage space.
Moreover, it is possible to provide a highly reliable showcase that can extend the lifespan of the main body and improve its appearance, as well as improve the cooling effect.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the configuration of the main part in the embodiment of the present invention, Fig. 2 is a perspective view schematically showing the structure of the main part in the embodiment, and Fig. 3 is an external perspective view of the embodiment. , FIG. 4 is a cross-sectional view taken along line A-A in FIG. 3 in the direction of the arrow, FIG. 5 is a diagram showing the configuration of the refrigeration system in the same embodiment, and FIG. 6 is a diagram showing the control circuit in the same embodiment. 7 is a diagram showing the configuration of a modified example of the insulating frame in the same embodiment. FIG. 8 is a diagram showing the configuration of a modified example of the control circuit in the same embodiment.
The figures show the configuration of a modified example of the refrigeration system in the same embodiment, FIG. 10 is an external perspective view of a conventional showcase, and
The figure is a diagram showing the configuration of main parts in FIG. 10. 11...Main body, 12...Transparent glass m (lid), 1
3...Storage, 15...Freezing device, 18...Cooling vibe (first evaporator), 19...Insulating frame, 19a...
・Drain receiving part, 22... frosting pipe (second evaporator)
, 42...Defrost timer. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 Figure 4 Figure 5tXl Muff] 6 Figure 7

Claims (1)

[Claims] In a showcase in which a lid body that can be opened and closed is provided at the upper opening of a storage, a refrigeration device having a first evaporator for cooling the inside of the storage and a second evaporator for frosting, and the second evaporator are provided. a defrosting means for defrosting periodically or as needed, the second evaporator is provided along the periphery of the opening of the storage, and a drain from the second evaporator is provided along the periphery of the opening. A showcase characterized by having a drain receiving part for receiving water.