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Refrigeration cycle device

A refrigeration cycle and control device technology, which is applied in the direction of refrigerators, refrigeration components, refrigeration and liquefaction, etc., and can solve the problem of increased possibility of adverse conditions

Active Publication Date: 2021-10-22
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, there is a problem that if the upper limit speed of the speed command of the inverter calculated by the control device exceeds the original upper limit speed, there is a high possibility that a malfunction will occur in the equipment constituting the refrigeration cycle device.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0030]

[0031] figure 1 It is a schematic diagram showing an example of the configuration of the air conditioner 1 according to Embodiment 1 of the present invention.

[0032] Such as figure 1 As shown, an air conditioner 1 as a refrigeration cycle device includes a control device 2 , a compressor 3 , a four-way valve 4 , an outdoor heat exchanger 5 , an electric expansion valve 6 , and an indoor heat exchanger 7 . The compressor 3, the four-way valve 4, the outdoor heat exchanger 5, the electric expansion valve 6, and the indoor heat exchanger 7 are connected by piping, and the refrigerant flows through the piping.

[0033] The air conditioner 1 includes a compressor temperature sensor 10, a discharge temperature sensor 11, an outdoor heat exchanger temperature sensor 12, an indoor heat exchanger temperature sensor 13, a room temperature sensor 14, a high-pressure pressure sensor 15, a low-pressure pressure sensor 16, and a current sensor as necessary. 17.

[0034] The ...

Embodiment approach 2

[0077] Figure 7 It is a block diagram showing an example of the configuration of the control device 2 according to the second embodiment.

[0078] Such as Figure 7 As shown, the control device 2 according to the second embodiment is characterized in that the protection control unit 102 has a PI controller corresponding to the discharge superheat degree, and the rotational speed selection unit 103 has a maximum rotational speed selection unit 106 . The other configurations and operations are the same as those in Embodiment 1, so detailed descriptions are omitted here.

[0079] Such as Figure 7 As shown, in Embodiment 2, the discharge superheat degree is included as the protection variable, and the discharge superheat degree lower limit value is included as the protection target value. Among them, the compressor temperature, discharge temperature, condensation temperature, evaporation temperature, high pressure, low pressure, and current included in the protection variable...

Embodiment approach 3

[0086] Figure 8 It is a block diagram showing an example of the configuration of the control device 2 according to the third embodiment.

[0087] Such as Figure 8 As shown, the control device 2 of Embodiment 3 is characterized in that, during the heating operation, the condensing temperature is defined as the current capacity value, the condensing temperature target value is defined as the capacity target value, and the calculation is used to make the condensing temperature gradually approach the condensing The rotational speed of the compressor 3 for the temperature target value. The other structures and operations are the same as those in Embodiment 2, and therefore detailed descriptions are omitted here.

[0088] As the condensation temperature, the temperature detected by the indoor heat exchanger temperature sensor 13 may be used. In addition, as the condensation temperature, a temperature converted by a calculation formula for obtaining the saturation temperature fr...

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PUM

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Abstract

The purpose of the present invention is to provide a refrigeration cycle device capable of optimally controlling its capacity. A refrigeration cycle device according to the present invention comprises: a compressor (3) having a variable rotation speed; and a control device (2) which calculates a rotation speed command of the compressor (3) for controlling the rotation speed of the compressor (3). The control device (2) includes: a capacity control unit (101) which calculates the rotation speed of the compressor (3) as the capacity rotation speed such that the current capacity value indicating the current capacity of the refrigeration cycle device (1) becomes a capacity target value that is timely determined; a protection control unit (102) which calculates the rotation speed of the compressor (3) as a protection rotation speed such that a protection variable, which is a variable related to a restriction item including protection on the refrigeration cycle device (1) becomes a protection target value that is timely determined; and a rotation speed selection unit (103) which selects, as the rotation speed command of the compressor (3), either one of the capacity rotation speed calculated by the capacity control unit (101) or the protection rotation speed calculated by the protection control unit (102), wherein the rotation speed command of the compressor (3) is calculated such that at least one among making the current capacity value close to the capacity target value, and making the protection variable close to the protection target value is satisfied.

Description

technical field [0001] The present invention relates to a refrigeration cycle device using a vapor compression refrigeration cycle, and more particularly to a refrigeration cycle device including a compressor with a variable rotation speed. Background technique [0002] Conventionally, a control device for a refrigeration cycle device has been disclosed, which uses PI control or the like to obtain an inverter motor speed command suitable for the load, and to suppress the high pressure of the refrigerant to an allowable value, based on the high pressure The limit value and the detected pressure on the high pressure side are used to calculate the upper limit speed of the speed command of the inverter motor from the graph (for example, refer to Patent Document 1). [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-Open No. 2005-16753 Contents of the invention [0006] The problem to be solved by the invention [0007] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B1/00
CPCF25B13/00F25B49/02F25B2313/0314F25B2313/0315F25B2700/21151F25B2700/21152F25B2313/0312F25B2313/003Y02B30/70F25B49/022
Inventor 森有辉藤塚正史中井孝洋
Owner MITSUBISHI ELECTRIC CORP