JPH06281271A - Refrigeration equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] By connecting and operating two groups of coolers with different evaporation temperatures to a refrigerator equipped with a twin scroll compressor, the intake gas pipes for each evaporation temperature are independently connected and operated. This is for highly reliable and highly efficient operation. [Structure] The refrigeration cycle includes a compressor (1), a condenser (2), liquid solenoid valves (3a, 3b), and expansion valves (4a, 4).
b) and coolers (5a, 5b), and each compressor is controlled in conjunction with each cooler. [Effect] Two groups of coolers with different evaporation temperatures are independently connected to the twin scroll compressor, and by controlling the compressors corresponding to each cooler individually, highly efficient operation becomes possible. Since the two compressors share the refrigeration oil in the same chamber, there is no oil deviation and high reliability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating apparatus of a type in which two groups of coolers having different evaporation temperatures are operated by a single refrigerator, and particularly highly efficient and reliable operation can be obtained. The present invention relates to a refrigeration system capable of

[0002]

2. Description of the Related Art As described in Watanabe Food Machinery Co., Ltd. Technical Workshop Material (April 8, 1992), the conventional device uses an independent refrigerator for each steam temperature, or Even when using a single refrigerator, a method is known in which two compressors are mounted and the oil level of each compressor is controlled by a float switch or the like.

[0003]

In the above-mentioned conventional technique, the method of connecting independent refrigerators has a problem that the installation workability including electricity and refrigerant piping work and space saving are lacking. In addition, a refrigeration system in which two compressors are installed in one refrigerator needs to be controlled by a float switch, etc., to prevent the oil level of each compressor from shifting, which makes the refrigeration cycle and control complicated and reliable. There was a problem of lack of sex.

An object of the present invention is to provide a refrigerating apparatus which has improved installation workability and reliability.

[0005]

In order to achieve the above object, a refrigerating apparatus of the present invention comprises a twin scroll compressor having two scroll compressors incorporated in a chamber, a condenser, and a second group. And a liquid solenoid valve and an expansion valve provided on the upstream side of each of the coolers, and a refrigerant gas pipe at each of the cooler outlets of each of the scroll compressors. It is characterized in that it is connected to the suction side and the discharge port of each scroll compressor is opened in the chamber, and that each scroll compressor is individually controlled to operate so that the evaporation temperatures of the respective coolers differ. To do.

[0006]

In general, when operating two groups of coolers having different evaporation temperatures, if two refrigerators are connected individually or one refrigerator is used, the cooler on the high evaporation temperature side is used. Even if the evaporating temperature is different in each cooler by providing an evaporating pressure control valve or the like in the outlet gas pipe, the operation on the suction side of the compressor is adapted to the cooler on the low evaporating temperature side, resulting in inefficient operation.

For this reason, if a plurality of compressors are mounted and operated independently in order to enable operation in accordance with the evaporation temperature of each cooler, highly efficient operation on the high evaporation temperature side becomes possible, Overall efficiency is improved. However, since the plurality of compressors individually hold the refrigerating machine oil, the refrigerating machine oil is deviated to one side, and some kind of oil level control is required.

Since the refrigerating apparatus of the present invention is constructed as described above, the two compressors can be installed in the same chamber to individually control the operation, and the refrigerating machine oil can be shared in the same chamber. By combining the twin scroll compressor with the above structure, oil level control becomes unnecessary, and highly reliable operation can be realized.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

As shown in FIG. 1, the refrigerating apparatus of this embodiment connects a compressor 1, a condenser 2, liquid solenoid valves 3a and 3b, expansion valves 4a and 4b, coolers 5a and 5b, and their components. A refrigerating cycle is configured by the pipes. The compressor 1 is provided with two compression mechanism parts 1aa and 1ab,
The motors 10a and 10b, which are directly connected to these compression mechanism units via drive shafts, are independently controlled independently. Compression mechanism sections 1aa, 1ab, motor 1
Both 0a and 10b are housed in one chamber, and the compression mechanism parts 1aa and 1ab are housed in the chamber.
The refrigerating machine oil 1c necessary for the lubrication is stored.

The two coolers 5a and 5b can be set to have different evaporation temperatures. For example, the cooler 5a on the high evaporation temperature side used in the refrigeration specification and the cooler on the low evaporation temperature side used in the freezing specification. The refrigerant evaporated and gasified in 5 b is sucked into the compression mechanism portions 1 aa and 1 ab of the compressor 1, respectively, and after being compressed, it is discharged into the chamber, merges, and is discharged to the condenser 2. After being cooled in the condenser 2 and condensed in the liquid refrigerant, it is branched and the liquid solenoid valves 3a, 3b and the expansion valve 4a,
After passing through 4b, it is squeezed so as to meet the refrigeration specifications and the freezing specifications, and then enters the coolers 5a and 5b again.

That is, the compressor motors 10a, 10b and the liquid solenoid valves 3a, 3b are interlocked and controlled independently depending on the temperature conditions of the respective cooler sides 5a, 5b.

Further, even if the refrigerating machine oil used to lubricate each compression mechanism portion is discharged together with the refrigerant, it is returned to the inside of the chamber together with the refrigerant.

[0014]

As described above, according to the refrigerating apparatus of the present invention, one having a higher evaporation temperature can perform highly efficient operation by sucking it into the compressor at a high temperature, and each compressor can operate independently. Even when operated in, the refrigerating machine oil can be shared in the same chamber, so that there is no deviation of the oil, and highly reliable operation is possible without particularly complicated oil level control.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a refrigeration cycle showing an embodiment of the present invention.

[Explanation of Codes] 1 ... Compressor, 1aa ... High evaporation temperature side compression mechanism section, 1ab
... Low evaporation temperature side compression mechanism section, 10a ... High evaporation temperature side motor, 10b ... Low evaporation temperature side motor, 1c ... Refrigerating machine oil, 2
... condenser 3a ... high evaporation temperature side liquid solenoid valve, 3b ... low evaporation temperature side liquid solenoid valve, 4a ... high evaporation temperature side expansion valve, 4b ... low evaporation temperature side expansion valve, 5a ... high evaporation temperature side cooler 5b ...
Low evaporating temperature side cooler.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenichiro Katogi 390 Muramatsu, Shimizu City, Shizuoka Prefecture Hitachi Ltd. Shimizu Plant

Claims (1)

[Claims] 1. A twin scroll compressor having two scroll compressors incorporated in a chamber, a condenser, two groups of coolers, and liquids provided on the respective upstream sides of the coolers. A refrigeration apparatus including an electromagnetic valve and an expansion valve, wherein refrigerant gas pipes at the outlets of the respective coolers are connected to the suction sides of the respective scroll compressors, and the discharge ports of the respective scroll compressors are in the chamber. A refrigerating apparatus which is configured to be opened and which individually controls the operation of each scroll compressor so that the respective evaporators have different evaporation temperatures.