Refrigeration energy storage system for refrigerator and control method

Abstract

The refrigeration energy storage system comprises a refrigeration module, a first temperature sensor and a cold storage module, the first temperature sensor is installed at the bottom of an inner container of the refrigerator, the cold storage module comprises a three-way valve, a cold storage assembly and a refrigerant pump, and an inlet of the cold storage assembly is connected with an inlet of an evaporator and an outlet of a throttling unit through the three-way valve; a refrigerant pump is arranged at an inlet of the cold storage assembly, an outlet of the cold storage assembly is connected with an outlet of the evaporator, the cold storage assembly comprises cold storage coils, a cold storage material, a heat preservation material and a second temperature sensor, the cold storage coils are embedded in the cold storage material, the cold storage material is wrapped with the heat preservation material, and the second temperature sensor is located between the cold storage coils. According to the invention, the energy storage device is arranged in the cabinet to store the cooling capacity generated during the operation of the equipment, and when the refrigeration system stops working, the low-temperature environment in the cabinet is maintained by the cooling capacity in the energy storage device, so that the purposes of reducing the starting and stopping frequency of the fixed-frequency compressor and reducing the energy loss are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerator energy efficiency control, and in particular to a refrigeration energy storage system and a control method for a refrigerator. Background Art

[0002] As a common refrigeration product for food storage in homes and businesses, refrigerators often require more precise temperature control. Since traditional fixed-frequency compressors cannot adjust power through operating frequency, they can only cool the refrigerator at rated power. In order to maintain the stability of the temperature inside the refrigerator, the compressor can only be turned on and off. Due to mechanical friction and electromagnetic loss during the start and stop of the compressor, energy consumption is relatively high. Therefore, in order to meet the accuracy of temperature control in the refrigerator, more ineffective energy consumption will be generated.

[0003] At present, there are many types of variable frequency compressors, which can adjust the speed according to the load, thereby reducing the start and stop time and reducing energy consumption. However, compared with fixed frequency compressors, variable frequency compressors have the disadvantages of poor stability and high price. Therefore, it is of great significance to explore the energy-saving methods of fixed frequency compressors in refrigerators. Summary of the invention

[0004] In order to overcome the above problems existing in the prior art, the present invention proposes a refrigeration energy storage system and a control method for a refrigerator.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a refrigeration energy storage system for a refrigerator, including a refrigeration module and a temperature sensor, wherein the temperature sensor is installed at the bottom of the refrigerator inner tank, the refrigeration module includes a compressor, a condenser, a throttling unit, and an evaporator, the compressor outlet is connected to the condenser inlet, the condenser outlet is connected to the throttling unit inlet, the throttling unit outlet is connected to the evaporator inlet, and the evaporator outlet is connected to the compressor inlet, and also includes a cold storage module, the cold storage module includes a three-way valve, a cold storage component, and a refrigerant pump, the cold storage component inlet is connected to the evaporator inlet and the throttling unit outlet through a three-way valve, a refrigerant pump is arranged at the cold storage component inlet, the cold storage component outlet is connected to the evaporator outlet, and the refrigeration module and the cold storage module are controlled by a control module.

[0006] The above-mentioned refrigeration energy storage system for a refrigerator, the cold storage component includes a cold storage coil, a cold storage material, a thermal insulation material, and a second temperature sensor. The cold storage coil is pre-buried in the cold storage material, and the cold storage material is wrapped with a thermal insulation material. The second temperature sensor is located between the cold storage coils. The second temperature sensor collects temperature information inside the cold storage material and sends the temperature information to the control module.

[0007] In the above-mentioned refrigeration energy storage system for a refrigerator, the cold storage material is a phase change material or a material with a large specific heat capacity. When the cold storage material is a phase change material, the phase change temperature of the phase change material is lower than the minimum temperature required by the refrigerator.

[0008] In the above-mentioned refrigeration energy storage system for a refrigerator, the cold storage component is located above the compressor room and is surrounded by a foam layer.

[0009] A control method for a refrigeration energy storage system for a refrigerator is based on the above-mentioned refrigeration energy storage system for a refrigerator, and is specifically expressed as follows: Y=T 2 Z = (1-T 2 )×T 1 D=T 1 +2T 2 Wherein: Y is the signal for controlling the compressor. When Y=1, the compressor starts, and when Y=0, the compressor stops; Z is the signal for controlling the refrigerant pump. When Z=1, the refrigerant pump starts, and when Z=0, the refrigerant pump stops; D is the signal for controlling the electromagnetic three-way valve. When D=3, the evaporator is connected to the throttling unit, when D=2, the throttling unit is connected to the cold storage coil, when D=1, the evaporator is connected to the cold storage coil, and when D=0, the electromagnetic three-way valve does not act; T 1 is the cabinet temperature sensor index. When the cabinet temperature detected by the cabinet temperature sensor is greater than the set value, T 1 =1, otherwise T 1 =0; T 2 is the temperature sensor index of the cold storage material. When the temperature of the cold storage material is greater than the set value, T 2 =1, otherwise T 2 =0.

[0010] The beneficial effect of the present invention is that by arranging an energy storage device in the cabinet to store the cold energy generated during the operation of the equipment, when the refrigeration system stops working, the cold energy in the energy storage device maintains the low temperature environment in the cabinet, thereby achieving the purpose of reducing the start and stop frequency of the fixed-frequency compressor and reducing energy loss. The present invention has low cost and can be used for the transformation of existing refrigerators. It can reasonably utilize peak and valley electricity prices, use valley electricity at night for cold storage, and reduce peak power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a control logic schematic diagram of the present invention; Figure 2 It is a schematic diagram of the present invention; Figure 3 This is the front view of the present invention applied to a refrigerator; Figure 4 This is a top view of the present invention applied to a refrigerator.

[0012] Among them, 1. Evaporator, 2. Temperature sensor 1, 3. Cold storage device, 3-1. Cold storage coil, 3-2. Cold storage material, 3-3. Temperature sensor 2, 4. Refrigerant pump, 5. Solenoid three-way valve, 6. Throttling device, 7. Condenser, 8. Compressor. DETAILED DESCRIPTION

[0013] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0014] like Figure 2 As shown, the present embodiment discloses a refrigeration energy storage system for a refrigerator, including a refrigeration module and a temperature sensor 2, wherein the temperature sensor 2 is installed at the bottom of the refrigerator inner tank, the refrigeration module includes a compressor 8, a condenser 7, a throttling unit 6, and an evaporator 1, wherein the outlet of the compressor 8 is connected to the inlet of the condenser 7, the outlet of the condenser 7 is connected to the inlet of the throttling unit 6, the outlet of the throttling unit 6 is connected to the inlet of the evaporator 1, and the outlet of the evaporator 1 is connected to the inlet of the compressor 8, and further includes a cold storage module, wherein the cold storage module includes an electromagnetic three-way valve 5, a cold storage component, and a refrigerant pump 4, wherein the inlet of the cold storage component is connected to the inlet of the evaporator and the outlet of the throttling unit through a three-way valve, a refrigerant pump is arranged at the inlet of the cold storage component, and the outlet of the cold storage component is connected to the outlet of the evaporator, and the refrigeration module and the cold storage module are controlled by a control module.

[0015] The cold storage component includes a cold storage coil 3-1, a cold storage material 3-2, a thermal insulation material, and a temperature sensor 2 3-3. The cold storage coil is pre-buried in the cold storage material, and the cold storage material is wrapped with a thermal insulation material. The temperature sensor 2 is located between the cold storage coils. The temperature sensor 2 collects temperature information inside the cold storage material and sends the temperature information to the control module.

[0016] The refrigeration energy storage system of this embodiment is applied to a refrigerator, such as Figure 3-4 As shown, the cold storage coil 3 is placed above the compressor room and is wrapped with a foam layer on all sides. The temperature sensor 1 2 is attached to the bottom of the refrigerator liner, and the temperature sensor 2 4 is placed between the cold storage coil 3 - 1 in the cold storage device 3 .

[0017] The control logic of the refrigeration energy storage system in this embodiment is as follows: Figure 1As shown, specifically: when the temperature in the cabinet is higher than the set temperature value and the temperature of the cold storage material 3-2 is higher than the set temperature value, the compressor 8 starts, and at the same time, the electromagnetic three-way valve 5 connects the throttling unit and the evaporator 1, and the refrigerant flows from the throttling unit 6 into the evaporator 1, and the refrigerant pump 4 is in a stopped state; when the temperature in the cabinet is lower than or equal to the set temperature value but the temperature of the cold storage material 3-2 is higher than the set temperature value, the compressor 8 remains in the started state, the electromagnetic valve 5 switches the state, connects the throttling unit 6 and the cold storage coil 3-1, and the refrigerant flows from the throttling unit 6 into the evaporator 1. Cold storage coil 3-1, at this time, the refrigerant pump 4 is still in the shutdown state; when the temperature in the cabinet is lower than or equal to the set temperature value and the temperature of the cold storage material 3-2 is lower than or equal to the set temperature value, the compressor 8 is shut down, and the refrigerant pump 4 remains in the shutdown state; when the temperature in the cabinet is higher than the set temperature value and the temperature of the cold storage material 3-2 is lower than or equal to the set temperature value, the compressor 8 is in the shutdown state, the electromagnetic three-way valve 5 connects the evaporator 1 and the cold storage coil 3-1, the refrigerant pump 4 runs, and the refrigerant flows from the cold storage coil 3-1 into the evaporator 1.

[0018] The control method can be expressed by the following formula: Y=T 2 Z = (1-T 2 )×T 1 D=T 1 +2T 2 Wherein: Y is the signal for controlling the compressor. When Y=1, the compressor starts, and when Y=0, the compressor stops; Z is the signal for controlling the refrigerant pump. When Z=1, the refrigerant pump starts, and when Z=0, the refrigerant pump stops; D is the signal for controlling the electromagnetic three-way valve. When D=3, the evaporator is connected to the throttling unit, when D=2, the throttling unit is connected to the cold storage coil, when D=1, the evaporator is connected to the cold storage coil, and when D=0, the electromagnetic three-way valve does not act; T 1 is the cabinet temperature sensor index. When the cabinet temperature detected by the cabinet temperature sensor is greater than the set value, T 1 =1, otherwise T 1 =0; T 2 is the temperature sensor index of the cold storage material. When the temperature of the cold storage material is greater than the set value, T 2 =1, otherwise T 2 =0.

[0019] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A refrigeration energy storage system for a refrigerator, comprising a refrigeration module and a temperature sensor 1, wherein the temperature sensor 1 is installed at the bottom of the refrigerator liner, the refrigeration module comprises a compressor, a condenser, a throttling unit, and an evaporator, wherein the compressor outlet is connected to the condenser inlet, the condenser outlet is connected to the throttling unit inlet, the throttling unit outlet is connected to the evaporator inlet, and the evaporator outlet is connected to the compressor inlet, characterized in that: It also includes a cold storage module, which includes a three-way valve, a cold storage component, and a refrigerant pump. The inlet of the cold storage component is connected to the inlet of the evaporator and the outlet of the throttling unit through a three-way valve. A refrigerant pump is arranged at the inlet of the cold storage component, and the outlet of the cold storage component is connected to the outlet of the evaporator. The refrigeration module and the cold storage module are controlled by a control module.

2. A refrigeration energy storage system for a refrigerator according to claim 1, characterized in that: The cold storage component includes a cold storage coil, a cold storage material, a thermal insulation material, and a second temperature sensor. The cold storage coil is pre-buried in the cold storage material, and the cold storage material is wrapped with a thermal insulation material. The second temperature sensor is located between the cold storage coils. The second temperature sensor collects temperature information inside the cold storage material and sends the temperature information to the control module.

3. A refrigeration energy storage system for a refrigerator according to claim 2, characterized in that: The cold storage material is a phase change material or a material with a large specific heat capacity. When the cold storage material is a phase change material, the phase change temperature of the phase change material is lower than the minimum temperature required by the refrigerator.

4. The refrigeration energy storage system for a refrigerator according to claim 1, characterized in that: The cold storage component is located above the compressor room and is surrounded by a foaming layer.

5. A control method for a refrigeration energy storage system for a refrigerator, characterized in that: A refrigeration energy storage system for a refrigerator according to any one of claims 1 to 4 is specifically expressed as follows: Y=T2 Z = (1-T2) × T1 D=T1+2T2 Wherein: Y is the signal for controlling the compressor. When Y=1, the compressor starts, and when Y=0, the compressor stops; Z is the signal for controlling the refrigerant pump. When Z=1, the refrigerant pump starts, and when Z=0, the refrigerant pump stops; D is the signal for controlling the electromagnetic three-way valve. When D=3, the evaporator is connected to the throttling unit, when D=2, the throttling unit is connected to the cold storage coil, when D=1, the evaporator is connected to the cold storage coil, and when D=0, the electromagnetic three-way valve does not act; T1 is the cabinet temperature sensor index. When the cabinet temperature detected by the cabinet temperature sensor is greater than the set value, T1=1, otherwise T1=0; T2 is the cold storage material temperature sensor index. When the cold storage material temperature is greater than the set value, T2=1, otherwise T2=0.

Images