JPS63223478A - Refrigerator - 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 [Field of Industrial Application] The present invention relates to a refrigeration system used for showcases, etc., and in particular, the present invention relates to a refrigeration system used for showcases etc. This relates to a refrigeration system that performs operations alternately or sequentially.

[Conventional technology]

The refrigeration equipment used to cool showcases, etc. is a cold 7J
]In order to prevent the temperature in the space to be cooled from exceeding Vf L/ during removal A1 to remove frost adhering to the container, 34 coolers were installed (
)te11. ! Defrosting is performed one after the other, and while one cooler is being defrosted, the temperature of the space to be cooled is lowered by the other cooler.
J1 container: The same temperature as the cold 741, or slightly lower than each! The temperature is kept at about 70%.

Generally, the start of defrosting of this cooling unit is carried out at fixed time intervals by a timer, and the defrosting is finished for a fixed period of 1 hour according to the instructions of the timer, or At the end of the frost, the temperature was undetectably 11 degrees due to the temperature riser or temperature sensor placed in the flow path of the cold air circulating through the slightly elevated temperature island. [Problems that the invention will not solve] ) However, when defrosting is carried out for a certain period of time,
cannot respond to seasonal fluctuations in frost I'A, and may continue defrosting operation even after defrosting is completed, or may defrost completely. In addition, the defrosting operation may end due to the eddy electric currents of the cold air being detected due to the termination of defrosting. 6 due to the cause, it is difficult to accurately detect the end of defrosting in 4.7 and
Because of IC, l, defrosting 1 (liquid cooling 7J in 3) space was easily depleted by 1σ, and the efficiency of the refrigeration equipment was not sufficiently increased by 11 l, which increased the electricity bill.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a refrigeration system that can reliably detect the end of defrosting of a cooler.

[Means for solving problems]

In order to achieve the above object, the present invention provides a refrigeration system that includes a plurality of cold JJI coolers and defrosts the coolers alternately or sequentially, in which the completion of defrosting of the coolers is detected. The feature is that the detector is installed near the cooler.

[For production]

Therefore, the completion of defrosting of the cooler can be accurately detected, defrosting can be performed reliably without unnecessary defrosting operation, cooling efficiency is improved, and the temperature increase in the space to be cooled can be suppressed. can.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

First of all, Figure 1 is cold l11 of cold uraso■! (This is an outline of the J cycle, and the thick line in the figure shows the flow of refrigerant when defrosting one of the cold IJJ units.

The refrigeration system 1 consists of two Rei 7J1 units 2a and 2b and a liquid cooling unit 1. Il
It consists of a condenser 3, a condenser 4, a liquid receiver 5, and 18 pipes connecting these, and various valves, which are hung outside the space and supply refrigerant to the coolers 2a and 2b. During the cooling operation, the refrigerant gas which has been compressed in the compression 113 to a high temperature and high pressure is radiated in the condenser 4 to liquefy most of it, and is sent to the liquid receiver 5. The liquefied liquid refrigerant passes through the valve 7 from the liquid receiver 5, and then passes through the valves Ba and Bb in front of both the coolers 2a and 2b, the expansion valves 9a and 9b, or the refrigerant flow rate control valve, and then flows through the cooling 7JI.
It is introduced into the vessels 2a and 2b, and evaporates to generate cold.

The evaporated cold tofu gas passes through the three-way valves 10a and 10b and returns to the compressor 3 for circulation.

In addition, when the compressor 3 and the liquid receiver 5 are connected to adjust the pressure inside the refrigeration cycle, the gas bypass valve 11 is connected to the refrigeration cycle.
), and when the pressure inside the liquid receiver 5 decreases, the compression I
The refrigerant gas is sent from the pipe 3 to the liquid receiver 5, and the pressure of the refrigerant is maintained at an appropriate value.

When defrosting the 10,000-unit cooler 2a, the valve 7 is closed and one of the three-way valves 10a is operated to supply refrigerant gas from the upper part of the receiver 5 from the opposite direction of the cooler 2a. At this time, the pressure in the pipes 12 on the coolers 2a and 2b is reduced by the pressure reducing valve 6, making it easier to introduce the refrigerant gas from the opposite direction.

This refrigerant gas is either saturated refrigerant vapor that has not been condensed in the condenser 4 or compressed lO! 3 to hot gas bypass valve 1
1 and enters the liquid receiver 5 l! 1′! The iIT side superheated refrigerant vapor has a larger enthalpy than liquid refrigerant, and defrosting can be completed in n1 hours.

7.11 Frost on the outside is melted and heat is exchanged in the cooling device 2a, and the condensed liquid refrigerant flows from the check valve 13a to the valve 8b and the expansion valve 9.
t) and enters the other cooler 2[), evaporates to generate cold, and cools one cooler 2a even during defrosting.
J, which maintains the space cooler tσ, is used.

The evaporated refrigerant gas is sucked into the compressor 3 through the other three-way valve 10b, as in the normal operation.

In addition, since the refrigerant gas condenses (in the cooler 2a), the F force in the liquid receiver 5 decreases, and the superheated refrigerant vapor on the high pressure side is compressed (13).
The hot gas passes through the hot gas bypass valve 11 and is guided to the liquid receiver 5, allowing for more efficient defrosting.

13b is a check valve used when defrosting the cooler 2b.

Further, the joint valve used in the above-mentioned refrigeration four-noise system usually uses a solenoid valve and is automatically controlled to open and close.

Figures 2 and 3 show an example of installing the freezer neck 1, with 20 oven-type show caps and 2) on the cost side.
4 coolers 2a and 2b are arranged, and the cooler 2
The cold air cooled by a and 2b is guided to the upper front surface through a duct 21 on the back side of the showcase 20, rectified by a discharge port 22, and discharged as an air curtain. The cold air is then sucked into the bottom of the showcase 20 from the lower cold air suction [123] and sent to the coolers 2a and 2b by the fan 2/I.

When defrosting one of the coolers 2a, in the showcase 20 of FIG. do.

In addition, in the showcase 20 in FIG. 3, the cold JJl device 2a,
Damper 2 installed in the passage from 2b to ducts 1 to 21
5 is activated to send only the cold air from the cold f, lI device 2b side in the cold air tank 2b to the ducts 1 to 21.

Equipment other than the coolers 2a and 2b is installed within the 200 case 26 or at a separate location.

And the above discussion 7JI:'A: 2 a, 2 b
A temperature sensor 30 for detecting the end of defrosting is disposed near C. This warm stone sensor 130 is attached to the surface of the coolers 2a, 2b, indicated by 330 r+ in FIG. On the surface or with code 3 in the same figure.
As shown by 0G, the expansion valve ↑9a, 9b or the expansion valve 9
Installed in at least one place on the surface of the original refrigerant control valve to be installed in place of a and 9b, and installed in the coolers 2a and 2b or the low pressure side piping 12 or the expansion valve 9a.
, 9b, etc., and transmits the termination of defrosting to a separately installed control device, thereby terminating the defrosting operation.

In addition, the temperature Jj30 is arranged near the coolers 2a and 2b, as indicated by the reference numeral 30d in FIGS. It is also possible to detect the end of defrosting by detecting the stomach.

Furthermore, in place of the above-mentioned light sensor 1)-31
is installed near the coolers 2a and 2b, and the optical sensor 31 receives the reflected light from the surface of the coolers 2a and 2b and sends frost to the coolers 2a and 2b. It is also possible to detect the end of defrosting by detecting no defrost.

In this way, Nku 141: Thirst [N 4J-30] near the cloth.
Alternatively, the optical sensor 31 can be installed to reliably detect the presence or absence of frost before the end of defrosting of the cooler, or the presence or absence of frost. It can be finished.Also, in the season J, it will definitely respond to the frosting of Ruru frost 11 (Sa, wasteful defrosting J! I! 1 J of rolling frost state:
It is possible to eliminate the cooling operation up to 7JI, thereby increasing the cold 7JI efficiency, minimizing the temperature of the IJI space to be cooled during defrosting, and reducing operating costs.

The present invention is not limited to the refrigeration system shown in the above embodiment, but can be similarly applied to refrigeration equipment using other refrigeration systems, and depending on the size of the showcase, three or more refrigeration systems can be used. It is also possible to arrange the containers as one set and defrost each cold 7JI container in sequence.

〔Effect of the invention〕

The present invention provides a detector for detecting the end of defrosting of the cooling unit in a refrigeration system that includes a plurality of coolers and in which the cooling units are exchanged or sequentially defrosted. Cold JJ
Since it is installed near the cooling unit, it is possible to reliably detect the end of defrosting, and it is possible to completely defrost the cooling unit without wasting 4T defrosting operation. The arm can be made smaller.Also, since the time when the cold FA unit is stopped for defrosting is known, the operation time of all coolers C can be extended, and the cooling efficiency of the refrigeration equipment can be fully demonstrated, reducing operating costs. You can save money.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a refrigeration recycle of a refrigeration system, and FIGS. 2 and 3 are sectional views of a showcase, showing examples in which the refrigeration system is installed in a showcase. 1... Refrigeration device 2a, 2b... Cold JJ device 3
...Compressor 4...Condenser 5...Liquid receiver
6...Reduction L valve 7, 8a, 8b-...Valve
9a, 9b...Expansion valve 10a, 10b...Three-way valve 11...Hole 1~Gas bypass valve 12...
・Piping 13a, 13b...Check valve 20...Showcase 30...Temperature sensor 31...Light sensor 1) - 4? I Revised Applicant Nakano Reiki Co., Ltd. Banro 1 Figure 1 N? 2 pieces 1 plot i 1 piece L

Claims (1)

[Claims] 1. In a refrigeration system that includes a plurality of coolers and defrosts the coolers alternately or sequentially, a detector for detecting the end of defrosting of the coolers is provided near the coolers. A refrigeration device characterized by: 2. Claim 1, wherein the detector is an optical sensor that detects the presence or absence of frost attached to the cooler.
Refrigeration equipment as described in section. 3. The refrigeration system according to claim 1, wherein the detector is a temperature sensor. 4. The refrigeration system according to claim 3, wherein the temperature sensor is provided in a cooler. 5. Claim 3, wherein the temperature sensor is provided in a low-pressure side pipe connected to a cooler.
Refrigeration equipment as described in section. 6. The refrigeration system according to claim 3, wherein the humidity sensor is provided in an expansion valve connected to a cooler. 7. The refrigeration system according to claim 3, wherein the temperature sensor is provided in a refrigerant flow control valve connected to a cooler. 8. The refrigeration system according to claim 3, wherein the temperature sensor detects the air temperature near the cooler.