CN-122015306-A - Refrigerating unit for refrigerated container

CN122015306ACN 122015306 ACN122015306 ACN 122015306ACN-122015306-A

Abstract

The invention discloses a refrigerating unit for a refrigerated container, which comprises a power supply module, a first refrigerating system and a controller, wherein the power supply module is provided with an independent first power supply channel and a second power supply channel, the first refrigerating system is provided with a first refrigerant circulation loop, a refrigerant circulates in a loop formed by a first compressor, a first condenser, a first electronic expansion valve and a first evaporator, the first power supply channel provides single-phase power for the first refrigerating system, the second refrigerating system provides single-phase power for the second refrigerating system, and the controller is used for controlling the first refrigerating system and the second refrigerating system through double independent signal channels respectively to enable the first refrigerating system and the second refrigerating system to work in a wheel refrigerating mode, a collaborative refrigerating mode or a quick cooling mode. According to the invention, by arranging the double-refrigerating system single-phase electric refrigerating unit, three modes of rotation refrigeration, cooperative refrigeration and quick cooling are supported, and different refrigeration requirements under various different scenes are adapted.

Inventors

WANG TENG
Yao Powei
CHEN ZHIHAO
LIU WEI
YU LIN
SUN LIYING

Assignees

寰宇东方国际集装箱(青岛)有限公司

Dates

Publication Date: 20260512
Application Date: 20260209

Claims (10)

1. A refrigeration unit for a refrigerated container, comprising: A power module having independent first and second power supply channels; The first refrigerating system is provided with a first refrigerant circulation loop, so that a refrigerant circulates in a loop formed by a first compressor, a first condenser, a first electronic expansion valve and a first evaporator, and the first power supply channel provides single-phase power for the first refrigerating system; the second refrigerating system is provided with a second refrigerant circulation loop, so that the refrigerant circulates in a loop formed by a second compressor, a second condenser, a second electronic expansion valve and a second evaporator, and the second power supply channel provides single-phase power for the second refrigerating system; The controller is used for respectively controlling the first refrigeration system and the second refrigeration system through double independent signal channels so as to enable the first refrigeration system and the second refrigeration system to work in a wheel refrigeration mode, a cooperative refrigeration mode or a quick cooling mode; In the wheel value refrigerating mode, the first refrigerating system and the second refrigerating system are controlled to alternately refrigerate, and whether to switch to a cooperative refrigerating mode or a quick refrigerating mode is controlled by monitoring the difference between the temperature in the box and the target temperature in the box; in the cooperative refrigeration mode, controlling one refrigeration system to be started after the first time, and stabilizing the total current output by the power supply module by controlling and adjusting the corresponding frequencies of the first compressor and the second compressor in the operation process of both refrigeration systems; when the absolute value of the difference between the first current on the first power supply channel and the second current on the second power supply channel reaches a preset current difference limit value, controlling and adjusting the opening of the first electronic expansion valve and the opening of the second electronic expansion valve so as to balance refrigeration output between two refrigeration systems, wherein whether to switch to a wheel refrigeration mode is controlled by monitoring the difference between the temperature in the box and the target temperature in the box; And in the rapid cooling mode, controlling the full-load starting of one refrigerating system after the full-load initial starting of the other refrigerating system for a second time, and stabilizing the total current output by the power supply module by controlling the corresponding frequencies of the first compressor and the second compressor in the running process of the two refrigerating systems, wherein whether the refrigerating system is switched to the wheel refrigerating mode is controlled by monitoring the temperature or the running time in the box.
2. A refrigeration unit for a refrigerated container as recited in claim 1 wherein the controller sets a first trigger condition that triggers a wheel refrigeration mode, a second trigger condition that triggers a coordinated refrigeration mode, and a third trigger condition that triggers a quick-cool mode; when a first trigger condition is met, the controller controls the refrigerating unit to enter a wheel refrigerating mode; When a second trigger condition is met, the controller controls the refrigerating unit to enter a cooperative refrigerating mode; and when a third trigger condition is met, the controller controls the refrigerating unit to enter a quick cooling mode.
3. A refrigeration unit for a refrigerated container as recited in claim 1 wherein, When entering the wheel refrigerating mode, firstly, rotating according to a default wheel value, and monitoring the running time difference value and the loss difference value of the two refrigerating systems in real time; And when the loss difference value does not reach the first loss threshold value and the running time difference value also does not reach the first time threshold value, the first refrigeration system and the second refrigeration system alternately refrigerate to maintain the default wheel value alternately refrigerate, otherwise, the wheel value is adaptively adjusted according to the load quantity, wherein the wheel value is reduced on the basis of the default wheel value when the load quantity is large, and the wheel value is increased on the basis of the default wheel value when the load quantity is small.
4. A refrigeration unit for a refrigerated container as claimed in claim 3 wherein, Executing a first fault monitoring process during the wheel refrigeration mode; In the first fault monitoring process, if any refrigerating system has a slight fault which can be self-healed by reducing the load capacity or adjusting the opening of the corresponding electronic expansion valve, reducing the load capacity or adjusting the opening of the corresponding electronic expansion valve for any refrigerating system, keeping the current running state of the rest refrigerating systems, and if any refrigerating system has a severe fault except the slight fault, closing any refrigerating system and simultaneously starting the other refrigerating system.
5. A refrigeration unit for a refrigerated container as recited in claim 1 wherein, In the cooperative refrigeration mode, the total current output by the stabilized power supply module is specifically: detecting a first current output by the first power supply channel and a second current output by the second power supply channel; calculating the sum of the first current and the second current as the total current output by the power supply module; And using a PID algorithm, taking the current difference between the preset current limiting threshold value and the total current as deviation, and controlling the output compressor frequency adjustment quantity to respectively adjust the frequency of the first compressor and the frequency of the second compressor.
6. A refrigeration unit for a refrigerated container as recited in claim 5 wherein, Executing a second fault monitoring process during the co-cooling mode; In the second fault monitoring process, if any refrigerating system has a slight fault which can be self-healed by reducing the load capacity or adjusting the opening of the corresponding electronic expansion valve, reducing the load capacity or adjusting the opening of the corresponding electronic expansion valve for any refrigerating system, keeping the current running state of the rest refrigerating systems, and if any refrigerating system has a severe fault except the slight fault, closing any refrigerating system, and simultaneously starting the other refrigerating system in full load.
7. A refrigeration unit for a refrigerated container as recited in claim 1 wherein, In the quick cooling mode, by controlling the corresponding frequencies of the first compressor and the second compressor, the total current output by the power supply module is stabilized, specifically: detecting a first current output by the first power supply channel and a second current output by the second power supply channel; calculating the sum of the first current and the second current as the total current output by the power supply module; And using a PID algorithm, taking the current difference between the preset current limiting threshold value and the total current as deviation, and controlling the output compressor frequency adjustment quantity to respectively adjust the frequency of the first compressor and the frequency of the second compressor.
8. A refrigeration unit for a refrigerated container as recited in claim 7 wherein, Executing a third fault monitoring process in the rapid cooling mode process; In the third fault monitoring process, if any refrigerating system has a slight fault which can be self-healed by reducing the load capacity or adjusting the opening of the corresponding electronic expansion valve, reducing the load capacity or adjusting the opening of the corresponding electronic expansion valve for any refrigerating system, keeping the current running state of the rest refrigerating systems, and if any refrigerating system has a severe fault except the slight fault, closing any refrigerating system, and simultaneously starting the other refrigerating system in full load.
9. A refrigeration unit for a refrigerated container as claimed in any one of claims 4, 6 and 8 wherein, After the fault of the refrigeration system with severe fault is repaired, the operation is started for a certain time with low load, and then the operation of the two refrigeration systems is controlled according to the current operation mode.
10. A refrigeration unit for a refrigerated container as recited in claim 1 wherein the refrigeration unit includes: the fixed frame is connected with a box body of the refrigerated container through an upper mounting hole of the fixed frame, the refrigerating unit is embedded and mounted at one end port of the refrigerated container, a sealing part is arranged on a part, opposite to the circumferential edge of the port, of the fixed frame, and the fixed frame is provided with a fixed plate and a frame opening which are arranged up and down; The heat insulation inner container is arranged at the frame opening and is provided with a refrigerating system installation space, other devices except the first evaporator, the second evaporator and the evaporating fan in the two refrigerating systems are all arranged in the refrigerating system installation space, the position, corresponding to the fixed plate, above the heat insulation inner container forms an evaporating system installation space, the first evaporator, the second evaporator and the evaporating fan are all arranged in the evaporating system installation space, and the evaporating fan is used for blowing air flow flowing through the first evaporator and/or the second evaporator into the box body.

Description

Refrigerating unit for refrigerated container Technical Field The invention relates to the technical field of refrigeration of refrigerated containers, in particular to a refrigerating unit for a refrigerated container. Background At present, the traditional sea/land transportation unit of the refrigerated container mostly adopts a three-phase 380/460V power supply, cannot adapt to the standard of household single-phase 220-240V voltage in North America, limits the scene application under the working conditions such as static storage and the like, and limits the household market development of the special refrigerated container. The existing single-phase electric refrigerating unit has two core defects, namely a single system, a single-use single-standby double system, a fault isolation requirement of physical separation can be considered, no cooperative operation design exists, the extremely low temperature/rapid cooling requirement can not be met, the other double system which is not physically separated shares core components such as a liquid storage device and the like, faults are easily involved, and the application reliability of the system is difficult to ensure. Disclosure of Invention In order to solve the technical problems, the invention provides a refrigerating unit for a refrigerated container, which is suitable for different refrigeration requirements in a plurality of different scenes by arranging a double-refrigerating-system single-phase electric refrigerating unit and supporting three modes of rotation refrigeration, cooperative refrigeration and quick refrigeration. In order to achieve the aim of the invention, the invention is realized by adopting the following technical scheme: The application relates to a refrigerating unit for a refrigerated container, comprising: A power module having independent first and second power supply channels; The first refrigerating system is provided with a first refrigerant circulation loop, so that a refrigerant circulates in a loop formed by a first compressor, a first condenser, a first electronic expansion valve and a first evaporator, and the first power supply channel provides single-phase power for the first refrigerating system; the second refrigerating system is provided with a second refrigerant circulation loop, so that the refrigerant circulates in a loop formed by a second compressor, a second condenser, a second electronic expansion valve and a second evaporator, and the second power supply channel provides single-phase power for the second refrigerating system; The controller is used for respectively controlling the first refrigeration system and the second refrigeration system through double independent signal channels so as to enable the first refrigeration system and the second refrigeration system to work in a wheel refrigeration mode, a cooperative refrigeration mode or a quick cooling mode; In the wheel value refrigerating mode, the first refrigerating system and the second refrigerating system are controlled to alternately refrigerate, and whether to switch to a cooperative refrigerating mode or a quick refrigerating mode is controlled by monitoring the difference between the temperature in the box and the target temperature in the box; in the cooperative refrigeration mode, controlling one refrigeration system to be started after the first time, and stabilizing the total current output by the power supply module by controlling and adjusting the corresponding frequencies of the first compressor and the second compressor in the operation process of both refrigeration systems; when the absolute value of the difference between the first current on the first power supply channel and the second current on the second power supply channel reaches a preset current difference limit value, controlling and adjusting the opening of the first electronic expansion valve and the opening of the second electronic expansion valve so as to balance refrigeration output between two refrigeration systems, wherein whether to switch to a wheel refrigeration mode is controlled by monitoring the difference between the temperature in the box and the target temperature in the box; And in the rapid cooling mode, controlling the full-load starting of one refrigerating system after the full-load initial starting of the other refrigerating system for a second time, and stabilizing the total current output by the power supply module by controlling the corresponding frequencies of the first compressor and the second compressor in the running process of the two refrigerating systems, wherein whether the refrigerating system is switched to the wheel refrigerating mode is controlled by monitoring the temperature or the running time in the box. In some embodiments of the application, the controller sets a first trigger condition that triggers a wheel refrigeration mode, a second trigger condition that triggers a co-refrigeration mode, and a third trigger condition that t