JPWO2023002520A5

JPWO2023002520A5 -

Info

Publication number: JPWO2023002520A5
Application number: JP2023536225A
Authority: JP
Filing date: 2021-07-19
Publication date: 2023-12-20

Description

開示に係る冷凍サイクル装置は、圧縮機、凝縮器、減圧装置および蒸発器が配管によって接続され、配管を冷媒が循環する冷媒回路を有する冷凍サイクル装置であって、冷媒回路から漏洩した冷媒を検知して検知信号を送る冷媒漏洩検知器と、制御装置とを備え、制御装置は、冷媒漏洩検知器からの検知信号に基づいて冷媒回路からの冷媒の漏洩検出を行うとともに、冷媒回路が有する機器または冷媒回路内の冷媒の状態に基づいて冷媒の冷媒漏洩判定処理を行って冷媒の漏洩検出を行い、冷媒漏洩判定処理に基づいて冷媒回路からの冷媒の漏洩を検出すると、第一警報信号を出力して冷媒回路の運転を継続し、冷媒漏洩検知器の検知に基づいて冷媒回路からの冷媒の漏洩を検出すると、第二警報信号を出力して冷媒回路の運転を停止させるものである。 The disclosed refrigeration cycle device is a refrigeration cycle device that has a refrigerant circuit in which a compressor, a condenser, a pressure reducing device, and an evaporator are connected by piping, and in which refrigerant circulates through the piping, and is capable of detecting refrigerant leaking from the refrigerant circuit. and a control device, the control device detects leakage of refrigerant from the refrigerant circuit based on the detection signal from the refrigerant leak detector, and detects the leakage of refrigerant from the refrigerant circuit, and detects the leakage of refrigerant from the refrigerant circuit based on the detection signal from the refrigerant leak detector. Alternatively, refrigerant leakage determination processing is performed to detect refrigerant leakage based on the state of the refrigerant in the refrigerant circuit , and when refrigerant leakage from the refrigerant circuit is detected based on the refrigerant leakage determination processing, the first alarm signal is sent. When a refrigerant leak is detected from the refrigerant circuit based on the detection by the refrigerant leak detector, a second alarm signal is output and the operation of the refrigerant circuit is stopped. .

Claims

A refrigeration cycle device having a refrigerant circuit in which a compressor, a condenser, a pressure reducing device, and an evaporator are connected by piping, and a refrigerant circulates through the piping,
a refrigerant leak detector that detects the refrigerant leaking from the refrigerant circuit and sends a detection signal;
and a control device;
The control device detects leakage of the refrigerant from the refrigerant circuit based on the detection signal from the refrigerant leak detector, and detects leakage of the refrigerant from the refrigerant circuit based on equipment included in the refrigerant circuit or the state of the refrigerant in the refrigerant circuit. perform a refrigerant leakage determination process of the refrigerant to detect leakage of the refrigerant ;
When leakage of the refrigerant from the refrigerant circuit is detected based on the refrigerant leak determination process, a first alarm signal is output to continue operation of the refrigerant circuit, and the refrigerant is detected based on the detection by the refrigerant leak detector. A refrigeration cycle device that outputs a second alarm signal to stop operation of the refrigerant circuit when leakage of the refrigerant from the circuit is detected .

The refrigeration cycle device according to claim 1, wherein the control device performs the refrigerant leakage determination process based on the degree of subcooling of the refrigerant in the refrigerant circuit.

A supercooling heat exchanger installed between the condenser and the pressure reducing device and supercooling the refrigerant flowing out from the condenser,
1 . The control device performs the refrigerant leak determination process of determining that the refrigerant is leaking when the temperature efficiency of the refrigerant in the supercooling heat exchanger is less than or equal to a set efficiency threshold. Or the refrigeration cycle apparatus according to claim 2.

a receiver that stores the refrigerant in the refrigerant circuit;
and a refrigerant height detection device that detects the height of the liquid level of the refrigerant accumulated in the receiver,
The control device periodically performs an operation in which the refrigerant in the refrigerant circuit is recovered by the receiver, and when the height of the liquid level of the refrigerant accumulated in the receiver is equal to or lower than a liquid level height threshold. 4. The refrigeration cycle device according to claim 1, wherein the refrigerant leakage determination process is performed to determine that the refrigerant is leaking.

The refrigeration cycle device according to claim 1, wherein the control device performs the refrigerant leakage determination process based on the number of times the compressor starts and stops driving.

The refrigerant circuit includes a low pressure sensor installed between the pressure reducing device and the suction side of the compressor to detect low pressure on the low pressure side of the refrigerant circuit,
The control device performs the refrigerant leak determination process of determining that the refrigerant is leaking when the low pressure is equal to or lower than a predetermined low pressure threshold when the compressor is stopped. The refrigeration cycle device according to any one of claims 1 to 5.

In the refrigerant circuit, a high pressure sensor is installed between the discharge side of the compressor and the pressure reducing device and detects high pressure on the high pressure side of the refrigerant circuit,
The control device performs the refrigerant leak determination process of determining that the refrigerant is leaking when the high pressure is equal to or lower than a predetermined high pressure threshold when the compressor is stopped. The refrigeration cycle device according to any one of claims 1 to 6.

a receiver that stores the refrigerant in the refrigerant circuit;
The compressor is installed between the discharge side and the pressure reducing device, and includes a high pressure sensor that detects high pressure on the high pressure side of the refrigerant circuit,
The control device is configured such that when the compressor is stopped after a pump-down operation for recovering the refrigerant to the receiver, a saturated liquid temperature of the refrigerant based on the high pressure is equal to or lower than a set pump-down threshold. 8. The refrigeration cycle device according to claim 1, wherein the refrigerant leakage determination process is performed to determine that the refrigerant is leaking when the refrigerant leaks.

It is further equipped with an outside air temperature detection device that detects the temperature of the outside air.
The refrigeration cycle device according to claim 8, wherein the control device sets the pump-down threshold based on the outside air temperature detected by the outside air temperature detection device.

When the detection signal is sent from the refrigerant leak detector, the control device determines whether the detection by the refrigerant leak detector is an erroneous detection based on a device included in the refrigerant circuit or a state of the refrigerant. The refrigeration cycle device according to any one of claims 1 to 9, which performs a detection and determination process.

a receiver for storing the refrigerant in the refrigerant circuit;
The controller according to any one of claims 1 to 10, when detecting leakage of the refrigerant from the refrigerant circuit and outputting the first alarm signal , performs a pump-down operation to recover the refrigerant to the receiver. The refrigeration cycle device described in section .

Equipped with a notification device that performs notification based on a signal related to notification,
The refrigeration cycle device according to any one of claims 1 to 11 , wherein the control device outputs the first alarm signal or the second alarm signal to the notification device.

The refrigeration cycle device according to any one of claims 1 to 12, wherein at least one of the first alarm signal and the second alarm signal is divided into a plurality of levels.

A load-side unit that supplies heat to a heat load, and a heat source-side unit that supplies heat to the load-side unit,
A refrigeration air conditioner comprising a refrigerant circuit of a refrigeration cycle apparatus according to any one of claims 1 to 13 , by connecting the load side unit and the heat source side unit through piping.