JP-7855087-B2 - Automatic switching device for refrigerant recovery operation and refrigerant recovery device

Inventors

• 落合 康敬
• 堂岸 善宏
• 大上 明徳
• ▲高▼橋 秀基

Assignees

• 三菱電機株式会社
• 三菱電機ビルソリューションズ株式会社

Dates

Publication Date

20260507

Application Date

20221206

Claims (9)

1. An automatic refrigerant recovery operation switching device that switches the flow path of the refrigerant when the refrigerant in the refrigeration cycle device is recovered into a cylinder by driving a recovery machine, A high-pressure connection port that communicates with the high-pressure side connection port of the high-pressure side piping of the refrigeration cycle device, A low-pressure connection port that communicates with the low-pressure side connection port of the low-pressure side piping of the refrigeration cycle device, A suction connection port connected to the suction port of the recovery machine, A discharge connection port connected to the discharge port of the recovery machine, A liquid connection port that connects to the liquid inlet of the cylinder, A gas connection port that connects to the gas inlet of the aforementioned cylinder, In a liquid recovery mode for recovering liquid refrigerant in the refrigeration cycle device, a switching unit switches between a flow path that connects the gas connection port and the suction connection port, the discharge connection port and the low-pressure connection port, and the high-pressure connection port and the liquid connection port; and in a gas recovery mode for recovering gaseous refrigerant in the refrigeration cycle device, a switching unit switches between a flow path that connects the high-pressure connection port and the low-pressure connection port and the suction connection port, and the discharge connection port and the liquid connection port. The system includes a control device that switches the flow path in the switching section, The control device is An automatic refrigerant recovery operation switching device having a switching processing unit that switches the flow path of the switching unit from the liquid recovery mode to the gas recovery mode when the change in the amount of refrigerant in the cylinder is smaller than a preset threshold.
2. The refrigerant recovery operation automatic switching device according to claim 1, wherein the switching unit has two four-way valves.
3. The refrigerant recovery operation automatic switching device according to claim 1, wherein the switching unit comprises one four-way valve and one three-way valve.
4. The refrigerant recovery operation automatic switching device according to claim 1, wherein the switching unit has three three-way valves.
5. The refrigerant recovery operation automatic switching device according to claim 1, wherein the switching unit has one six-way valve.
6. The control device calculates the change in the amount of refrigerant based on the amount of refrigerant obtained from the weight of the refrigerant in the cylinder, as described in any one of claims 1 to 5.
7. The control device calculates the change in the amount of refrigerant based on the amount of refrigerant obtained from the liquid level of the liquid refrigerant in the cylinder, according to any one of claims 1 to 5.
8. A refrigerant recovery apparatus comprising a refrigerant recovery operation automatic switching device and a recovery machine according to any one of claims 1 to 5 .
9. The refrigerant recovery apparatus according to claim 8, wherein the recovery device comprises a compressor for compressing the refrigerant and a condenser for condensing the refrigerant.

Description

This disclosure relates to an automatic refrigerant recovery operation switching device and a refrigerant recovery device for switching refrigerant recovery operations when recovering refrigerant in a refrigerant recovery device such as a refrigeration cycle device. Refrigeration cycle systems, such as refrigeration units or air conditioning units, operate by circulating a refrigerant sealed within a refrigerant circuit to exchange heat with a fluid such as air or water, thereby heating or cooling the fluid. However, some refrigerants have a high global warming potential. If such refrigerants are released into the atmosphere, they can cause global warming. Therefore, when moving a refrigeration cycle system containing a refrigerant or replacing equipment, it is necessary to recover the refrigerant to prevent its release into the atmosphere. Accordingly, refrigerant recovery devices have been proposed to recover refrigerant from refrigerant recovery devices such as refrigeration cycle systems (see, for example, Patent Document 1). Japanese Patent Publication No. 2005-249297 This diagram shows the configuration of a refrigerant recovery system centered on the refrigerant recovery operation automatic switching device 100 according to Embodiment 1.This diagram shows the fluid flow relationship in the gas recovery mode of the refrigerant recovery operation automatic switching device 100 according to Embodiment 1.This figure shows the fluid flow relationship in the liquid recovery mode of the refrigerant recovery operation automatic switching device 100 according to Embodiment 1.This figure shows the change in weight of cylinder 400 over time in the liquid recovery mode according to Embodiment 1.This diagram shows the control flow during automatic refrigerant recovery operation of the automatic refrigerant recovery operation switching device 100 according to Embodiment 1.This diagram shows the configuration of a refrigerant recovery system centered on the refrigerant recovery operation automatic switching device 100 according to Embodiment 2.This diagram shows the fluid flow relationship in the gas recovery mode of the refrigerant recovery operation automatic switching device 100 according to Embodiment 2.This figure shows the fluid flow relationship in the liquid recovery mode of the refrigerant recovery operation automatic switching device 100 according to Embodiment 2.This diagram shows the configuration of a refrigerant recovery system centered on the automatic refrigerant recovery operation switching device 100 according to Embodiment 3.This diagram shows the fluid flow relationship in the gas recovery mode of the refrigerant recovery operation automatic switching device 100 according to Embodiment 3.This diagram shows the fluid flow relationship in the liquid recovery mode of the refrigerant recovery operation automatic switching device 100 according to Embodiment 3.This diagram shows the configuration of a refrigerant recovery system centered on the refrigerant recovery operation automatic switching device 100 according to Embodiment 4.This diagram shows the fluid flow relationship in the gas recovery mode of the refrigerant recovery operation automatic switching device 100 according to Embodiment 4.This diagram shows the fluid flow relationship in the liquid recovery mode of the refrigerant recovery operation automatic switching device 100 according to Embodiment 4.This diagram shows the configuration of a refrigerant recovery system centered on a refrigerant recovery device 110 according to Embodiment 5.This figure shows the fluid flow relationship in the gas recovery mode of the refrigerant recovery device 110 according to Embodiment 5.This figure shows the fluid flow relationship in the liquid recovery mode of the refrigerant recovery device 110 according to Embodiment 5. The following description will explain the refrigerant recovery operation automatic switching device and other components according to the embodiment, with reference to the drawings. In the following drawings, components with the same reference numerals are the same or equivalent and are common throughout the entire text of the embodiment described below. Also, the size relationships of the components in the drawings may differ from those of the actual components. Furthermore, the forms of the components shown throughout the specification are merely examples and are not limited to the forms described in the specification. In particular, the combinations of components are not limited to the combinations in each embodiment, and components described in other embodiments can be applied to other embodiments. Furthermore, the high and low values of pressure and temperature are not determined in relation to absolute values, but are determined relatively in relation to the state and operation of the device, etc. Also, when there is no need to distinguish or specify multiple similar devices, etc., that are distinguished by subscripts, the subs