US-12624873-B2 - Refrigeration system and refrigerating appliance

US12624873B2US 12624873 B2US12624873 B2US 12624873B2US-12624873-B2

Abstract

A refrigeration system includes: a refrigeration assembly including a compressor, a first evaporator, and a second evaporator; and a first defrost bypass pipeline and a second defrost bypass pipeline for circulating refrigerant from the compressor to generate heat; the first defrost bypass pipeline is thermally connected to the first evaporator, the second defrost bypass pipeline is thermally connected to the second evaporator; one evaporator provides cooling when the defrost bypass pipelines heat another evaporator, so as to prevent temperature fluctuations in a storage compartment of the refrigerating appliance. The refrigerating apparatus includes a cabinet and the refrigeration system.

Inventors

Jian Ma
LISHENG JI
Jianquan Chen
Zhanpeng CUI
Xianghui Zhao
Fei Xing

Assignees

QINGDAO HAIER REFRIGERATOR CO., LTD.
Haier Smart Home Co., Ltd.

Dates

Publication Date: 20260512
Application Date: 20220525
Priority Date: 20210629

Claims (8)

1 . A refrigeration system for a refrigerating appliance, comprising: a refrigeration assembly comprising a compressor, a first evaporator, and a second evaporator, forming a refrigeration circuit; defrost bypass pipelines having a first defrost bypass pipeline and a second defrost bypass pipeline for circulating refrigerant from the compressor to generate heat; the first defrost bypass pipeline is thermally connected to the first evaporator, and the second defrost bypass pipeline is thermally connected to the second evaporator; the refrigeration system is configured to provide cooling by one evaporator when the defrost bypass pipelines heat another evaporator, so as to prevent temperature fluctuations in a storage compartment of the refrigerating appliance; and cooling bypass pipelines comprising a first cooling bypass pipeline and a second cooling bypass pipeline; wherein the first cooling bypass pipeline is connected to the first defrost bypass pipeline, for guiding the refrigerant flowing through the first defrost bypass pipeline to the second evaporator, so that the second evaporator generates cooling; the second cooling bypass pipeline is connected to the second defrost bypass pipeline, for guiding the refrigerant flowing through the second defrost bypass pipeline to the first evaporator, so that the first evaporator generates cooling, and the refrigeration system further comprises: a bypass return pipeline connecting the outlet of the first evaporator to a suction port of the compressor, and used for guiding the refrigerant flowing successively through the second cooling bypass pipeline and the first evaporator to the suction port of the compressor when the second defrost bypass pipeline heats the second evaporator.
2 . The refrigeration system of claim 1 , wherein: the first cooling bypass pipeline is connected to the inlet of the second evaporator, a first bypass throttling device is arranged on the first cooling bypass pipeline for throttling the refrigerant flowing towards the second evaporator.
3 . The refrigeration system of claim 1 , wherein: the second cooling bypass pipeline is connected to the inlet of the first evaporator, a second bypass throttling device is arranged on the second cooling bypass pipeline for throttling the refrigerant flowing towards the first evaporator.
4 . The refrigeration system of claim 1 , further comprising: a first switching valve connected to the outlet of the first evaporator, and having a valve port connecting to the second evaporator, and a valve port connecting to the bypass return pipeline; the first switching valve opens the valve port connecting to the bypass return pipeline when the second defrost bypass pipeline heats the second evaporator using generated heat, and opens the valve port connecting to the second evaporator when both the first and second evaporators provide cooling.
5 . The refrigeration system of claim 1 , wherein: the first evaporator and the second evaporator are sequentially connected downstream of an exhaust port of the compressor; the refrigeration assembly further comprises a refrigeration throttling device setting in the refrigeration circuit and upstream of the first evaporator, and the refrigeration throttling device throttle the refrigerant flowing towards the first evaporator; and the second cooling bypass pipeline is connected to the inlet of the refrigeration throttling device.
6 . The refrigeration system of claim 5 , wherein: the refrigeration assembly further comprises a condenser connected between the exhaust port of the compressor and the refrigeration throttling device; and the refrigeration system further comprises a second switching valve connected to the exhaust port of the compressor and having a valve port connecting to the condenser, a valve port connecting to the first defrost bypass pipeline, and a valve port connecting to the second defrost bypass pipeline; the second switching valve opens the valve port connecting to the condenser when both the first and second evaporators provide cooling, opens the valve port connecting to the first defrost bypass pipeline when the first defrost bypass pipeline heats the first evaporator using generated heat, and opens the valve port connecting to the second defrost bypass pipeline when the second defrost bypass pipeline heats the second evaporator using generated heat.
7 . The refrigeration system of claim 1 , wherein: the first defrost bypass pipeline is either coiled around the first evaporator or set adjacent to the first evaporator; the second defrost bypass pipeline is either coiled around the second evaporator or set adjacent to the second evaporator.
8 . A refrigerating appliance, comprising: a cabinet forming a storage compartment inside; and the refrigeration system of claim 1 ; where the first and second evaporators respectively provide cooling to the storage compartment.

Description

TECHNICAL FIELD The present subject matter relates to refrigeration, particularly to a refrigeration system and a refrigerating appliance. BACKGROUND Refrigerating appliances, such as refrigerators, freezers, and refrigerated cabinets, use refrigeration systems for cooling. During the operation of refrigeration systems, due to a low temperature, surfaces of an evaporator is prone to frost, which can reduce the cooling efficiency of the evaporator. Therefore, it is necessary to defrost the evaporator timely. Some refrigerating appliances in prior arts use electric heating wires to heat the evaporator for defrosting. This defrosting method not only has a slow defrosting rate and a long time but also causes a significant temperature rise in the storage compartment. Hence, there is a need to improve the defrosting method of the evaporator. SUMMARY One objective of this invention is to overcome at least one technical defect in prior arts by providing a refrigeration system and a refrigerating appliance. A further objective is to improve the defrosting method of an evaporator, so as to increase the defrosting rate of the evaporator while effectively preventing significant temperature fluctuations in a storage compartment. Another further objective is to extend the lifespan of the refrigeration system. Another further objective is to improve the energy efficiency of the refrigeration system and the refrigerating appliance. An additional further objective is to simplify the structure and the control process of the refrigeration system. According to an embodiment of the present subject matter, a refrigeration system for a refrigerating appliance comprises: a refrigeration assembly comprising a compressor, a first evaporator, and a second evaporator, forming a refrigeration circuit; and defrost bypass pipelines having a first defrost bypass pipeline and a second defrost bypass pipeline for circulating refrigerant from the compressor to generate heat; the first defrost bypass pipeline is thermally connected to the first evaporator, and the second defrost bypass pipeline is thermally connected to the second evaporator; the refrigeration system is configured to provide cooling by one evaporator when the defrost bypass pipelines heat another evaporator, so as to prevent temperature fluctuations in a storage compartment of the refrigerating appliance. Optionally, the refrigeration system further comprises: cooling bypass pipelines comprising a first cooling bypass pipeline and a second cooling bypass pipeline; wherein, the first cooling bypass pipeline is connected to the first defrost bypass pipeline, for guiding the refrigerant flowing through the first defrost bypass pipeline to the second evaporator, so that the second evaporator generates cooling; the second cooling bypass pipeline is connected to the second defrost bypass pipeline, for guiding the refrigerant flowing through the second defrost bypass pipeline to the first evaporator, so that the first evaporator generates cooling. Optionally, the first cooling bypass pipeline is connected to the inlet of the second evaporator, a first bypass throttling device is arranged on the first cooling bypass pipeline for throttling the refrigerant flowing towards the second evaporator. Optionally, the second cooling bypass pipeline is connected to the inlet of the first evaporator, a second bypass throttling device is arranged on the second cooling bypass pipeline for throttling the refrigerant flowing towards the first evaporator. Optionally, the refrigeration system further comprises: a bypass return pipeline connecting the outlet of the first evaporator to a suction port of the compressor, and used for guiding the refrigerant flowing successively through the second cooling bypass pipeline and the first evaporator to the suction port of the compressor when the second defrost bypass pipeline heats the second evaporator. Optionally, the refrigeration system further comprises: a first switching valve connected to the outlet of the first evaporator, and having a valve port connecting to the second evaporator, and a valve port connecting to the bypass return pipeline; the first switching valve opens the valve port connecting to the bypass return pipeline when the second defrost bypass pipeline heats the second evaporator using generated heat, and opens the valve port connecting to the second evaporator when both the first and second evaporators provide cooling. Optionally, the first evaporator and the second evaporator are sequentially connected downstream of an exhaust port of the compressor; the refrigeration assembly further comprises a refrigeration throttling device setting in the refrigeration circuit and upstream of the first evaporator, and the refrigeration throttling device throttle the refrigerant flowing towards the first evaporator; and the second cooling bypass pipeline is connected to the inlet of the refrigeration throttling device. Optionally, the refrigeration