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freezer

A technology of refrigeration device and decompression device, which is applied in refrigerators, refrigeration and liquefaction, lighting and heating equipment, etc., can solve the problems of reduced refrigeration capacity and narrowed operating range of compressors.

Active Publication Date: 2021-09-10
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that the operating range of the compressor is narrowed and the refrigeration capacity is reduced.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0017] figure 1 Embodiment of the present invention is a refrigerant circuit diagram of refrigerating apparatus according to. The operation of refrigeration system 100 is conveyed to the cooling space warehouse cold air by performing a vapor compression refrigeration cycle, it is placed in the cooling space of the cooling of the article.

[0018] like figure 1 Shown, refrigeration system 100 having a heat-source side unit 10 and the load-side unit 20. The heat-source side unit 10 and the load-side unit 20 are independent units, constituting the refrigerant pipe via the connecting pipe 2 2a and 2b are connected.

[0019] Refrigeration apparatus 100 includes a compressor 11, a condenser 12, receiver 13, 14, an expansion device 21 and an evaporator 22 through the heat exchanger, the refrigerant which is formed for the refrigerant circulated through the refrigerant circuit 30 connected to pipe 2 . Here, the compressor 11, condenser 12, receiver 13 and the subcooling heat exchanger 14...

Embodiment approach 2

[0092] Figure 5 It is a refrigerant circuit diagram of the refrigeration apparatus according to Embodiment 2 of the present invention. Image 6 Be shown Figure 5 A block diagram of an example of a functional structure of a control device of a freezer device. The structure of the refrigeration apparatus 100A of the second embodiment is the same as the refrigeration apparatus 100 of the first embodiment, and thus the same reference numerals are used for the same reference numerals.

[0093] like Figure 5 As shown, the freezing device 100A has a control device 50a in the heat source side unit 10a. And, if Image 6 As shown, the control device 50a has a data acquisition unit 51, the conversion unit 52, the storage unit 53, the calculation unit 54, the high voltage determination unit 55, the update processing unit 56a, the operation control unit 57, and the current determination unit 58. Similarly to the above-described modification, the storage unit 53 stores a running current target v...

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Abstract

The refrigerating device has: a refrigerant circuit that connects a compressor, a condenser, a pressure reducing device, and an evaporator through refrigerant piping; a discharge pressure sensor that detects the pressure of refrigerant discharged from the compressor, that is, a discharge pressure; and A control device, which controls the refrigerant circuit. The control device has a storage unit that stores a high-pressure calculation formula that uses the evaporation temperature of the refrigerant circuit as a linear function to obtain an upper limit high pressure, and a frequency calculation formula that uses the evaporation temperature as a variable. The temperature is a quadratic function of the variable, which is used to find the upper limit frequency. In addition, the control device has: a calculation unit that obtains the upper limit high pressure and the upper limit frequency using the high pressure calculation formula and the frequency calculation formula; a high pressure determination unit that determines whether the discharge pressure is higher than the upper limit high pressure; When the high pressure is higher than the upper limit, the operating frequency of the compressor is lowered to the upper limit frequency.

Description

Technical field [0001] The present invention relates to a refrigeration apparatus comprising a refrigerant circuit comprising a compressor, it is placed in the cooling space for storage and other items for cooling. Background technique [0002] In the refrigeration apparatus is mounted on the compressor, associated with increased operating current value of the drive motor and the calorific value increased, and therefore cause a reduced drive motor insulation. Thus, in the conventional refrigeration system in order to prevent an abnormal increase in the operating current value of the drive motor of the compressor, the target evaporation temperature for each range set stepwise, to determine the upper limit of the operating frequency of the compressor ( for example, see Patent Document 1). Patent Document refrigerating apparatus 1 is set, as the target evaporation temperature becomes higher, and the upper limit of the operating frequency is reduced stepwise. [0003] Patent Document...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B1/00
CPCF25B1/00
Inventor 上田耕平
Owner MITSUBISHI ELECTRIC CORP