CN115854609A - Cold chain container and variable frequency refrigeration control system thereof - Google Patents
Cold chain container and variable frequency refrigeration control system thereof Download PDFInfo
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- CN115854609A CN115854609A CN202211438859.1A CN202211438859A CN115854609A CN 115854609 A CN115854609 A CN 115854609A CN 202211438859 A CN202211438859 A CN 202211438859A CN 115854609 A CN115854609 A CN 115854609A
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Abstract
The invention discloses a cold chain container and a variable frequency refrigeration control system thereof, wherein the system comprises a variable frequency refrigeration unit, an energy storage unit, a control unit and an acquisition unit for acquiring system signals; the variable-frequency refrigeration unit comprises a voltage input end, a filter circuit, a rectification circuit, an inverter circuit and a refrigeration device which are connected in sequence; the control unit is connected with the voltage input end and used for receiving the system signal and outputting a control signal to the inverter circuit according to the system signal; the energy storage unit is arranged in front of the inverter circuit and used for providing a first working voltage for the refrigerating device when no voltage is input at the voltage input end; the system signals comprise a temperature signal, a gaseous refrigerant pressure signal, a humidity signal, an operation voltage signal and an operation current signal in the container. The system monitors various signals in the system by acquiring various system signals, and performs corresponding operation adjustment through the control unit. The system can realize accurate temperature control, economy, energy conservation and power-off heat preservation of the cold chain container.
Description
Technical Field
The invention relates to the technical field of traffic engineering, in particular to a cold-chain container and a variable-frequency refrigeration control system thereof.
Background
A refrigerated container is a container designed specifically for transporting frozen goods or cold goods that require a certain temperature to be maintained. The cold chain container is one kind of cold storage container and has refrigerating function.
At present, a refrigeration system of a cold chain container mostly adopts a fixed frequency scheme, however, the temperature control precision of the fixed frequency refrigeration system is not high, the energy consumption is large, and the use cost of the cold chain container is large; because under the mobile scene, the condition that transport means (freight train, cargo ship, etc.) inevitably have and rock in the driving process, factor such as road surface road conditions leads to the unstability of transportation in addition, the higher rotational speed that the compressor brought relative fixed frequency scheme during frequency conversion refrigeration has more aggravated the liquid impact risk.
Moreover, under the transferring conditions of replacing a transport tool and stopping energy supply equipment and the like of the existing cold chain container, due to the fact that other energy supply modes are not available, the problem that stored articles are damaged due to transferring exists.
Disclosure of Invention
The invention aims to solve the technical problem of providing a cold chain container and a variable frequency refrigeration control system thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows: constructing a cold chain container variable frequency refrigeration control system comprising:
the variable-frequency refrigeration unit comprises a voltage input end, a filter circuit, a rectification circuit, an inverter circuit and a refrigeration device which are connected in sequence;
the acquisition unit is used for acquiring system signals; the system signals comprise a temperature signal, a gaseous refrigerant pressure signal, a humidity signal, an operation voltage signal and an operation current signal in the container;
the control unit is connected with the voltage input end and used for receiving the system signal acquired by the acquisition unit and outputting a control signal to the inverter circuit according to the system signal;
and the energy storage unit is arranged in front of the inverter circuit and used for providing a first working voltage for the refrigerating device when no voltage is input at the voltage input end.
Preferably, in the variable-frequency refrigeration control system for the cold-chain container constructed in the present invention, the refrigeration device includes a liquid storage tank and a vacuum pumping device, the liquid storage tank is used for storing a refrigerant, and the vacuum pumping device is used for performing vacuum pumping treatment on the inside of the liquid storage tank.
Preferably, in the frequency conversion refrigeration control system for the cold-chain container constructed in the invention, a contactor is further included, an operating end of the contactor is connected between the voltage input end and the filter circuit, and a signal receiving end of the contactor is connected to the control unit.
Preferably, in the frequency conversion refrigeration control system for the cold-chain container constructed by the present invention, the control unit is further configured to detect whether a phase sequence of the voltage input by the voltage input terminal is correct, if yes, the control unit controls the system to operate normally, and if not, the control unit sends a phase change signal to the signal receiving terminal to control the contactor to implement automatic phase change.
Preferably, in the frequency conversion refrigeration control system for the cold-chain container, the frequency conversion refrigeration control system further comprises a display unit, wherein the display unit is connected with the control unit and is used for inputting external information and/or reading internal information.
Preferably, in the frequency conversion refrigeration control system for the cold-chain container, the frequency conversion refrigeration control system further comprises a communication unit, and the communication unit is used for sending system state information to the remote monitoring equipment.
Preferably, in the frequency conversion refrigeration control system for the cold-chain container constructed in the invention, a voltage transformation unit is further included, and the voltage transformation unit is connected between the voltage input end and the control unit and is used for providing a second working voltage for the control unit.
Preferably, in the frequency conversion refrigeration control system for the cold-chain container constructed in the present invention, a secondary battery is further included, and the secondary battery is configured to store the second operating voltage provided by the voltage transformation unit and provide the second operating voltage to the control unit when no voltage is input to the voltage input end.
Preferably, in the frequency conversion refrigeration control system for the cold-chain container constructed in the present invention, a driving circuit is further included, a driving circuit is disposed between the control unit and the inverter circuit, the control unit outputs the control signal to the driving circuit, and the driving circuit drives the inverter circuit to control the refrigeration device to perform frequency conversion refrigeration.
The invention also constructs a cold chain container, which comprises the variable-frequency refrigeration control system of the cold chain container.
By implementing the invention, the following beneficial effects are achieved:
the invention provides a cold chain container and a variable frequency refrigeration control system thereof, wherein the system comprises a variable frequency refrigeration unit, an energy storage unit, a control unit and a signal acquisition unit for acquiring a system; the variable-frequency refrigeration unit comprises a voltage input end, a filter circuit, a rectification circuit, an inverter circuit and a refrigeration device which are connected in sequence; the control unit is connected with the voltage input end and used for receiving the system signal acquired by the acquisition unit and outputting a control signal to the inverter circuit according to the system signal; the energy storage unit is arranged in front of the inverter circuit and used for providing a first working voltage for the refrigerating device when no voltage is input at the voltage input end; the system signals comprise a temperature signal, a gaseous refrigerant pressure signal, a humidity signal, an operation voltage signal and an operation current signal in the container. The system monitors various signals in the system by acquiring various system signals, and performs corresponding operation adjustment through the control unit. The system can realize accurate temperature control, economy, energy conservation and power-off heat preservation of the cold chain container.
Drawings
The invention will be further described with reference to the following drawings and examples, in which:
FIG. 1 is a schematic diagram of the system architecture of a variable frequency refrigeration control system for a cold-chain container according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of a system architecture of a variable frequency refrigeration control system for a cold-chain container according to another embodiment of the invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
It should be noted that the block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware units or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
The cold chain container is a refrigerated container with a refrigeration function and used for cold chain transportation.
Referring to fig. 1, a first embodiment of the invention discloses a variable-frequency refrigeration control system for a cold-chain container, which comprises a variable-frequency refrigeration unit, a collection unit, a control unit and an energy storage unit.
The frequency conversion refrigeration unit comprises a voltage input end, a filter circuit, a rectification circuit, an inverter circuit and a refrigeration device which are connected in sequence. The acquisition unit is used for acquiring system signals. The control unit is connected with the voltage input end and used for receiving the system signals acquired by the acquisition unit and outputting control signals to the inverter circuit according to the system signals. The energy storage unit is arranged in front of the inverter circuit and used for providing a first working voltage for the refrigerating device when no voltage is input to the voltage input end.
In order to accurately acquire the running state of the cold-chain container, the refrigeration of the cold-chain container is adjusted in time through the cold-chain container variable-frequency refrigeration control system, various system signals are acquired through the acquisition unit, various signals in the system are monitored, and corresponding system running adjustment is performed through the control unit, wherein the system signals comprise temperature signals, gaseous refrigerant pressure signals, humidity signals, running voltage signals and running current signals in the container. The acquisition unit is further used for acquiring relevant system signals outside the cold-chain container, such as an external temperature signal, an external humidity signal, a bypass frosting state acquisition signal and an external atmospheric pressure signal.
When the acquisition units acquire the system signals and the related system signals, the control unit acquires the system signals and the related system signals acquired by the acquisition units, and is used for controlling the whole variable-frequency refrigeration control system of the cold-chain container, for example, monitoring that frosting occurs in a bypass and outputting a defrosting signal; and when the pressure of the gaseous refrigerant is monitored to be larger than a critical value, a liquid impact risk signal is output. The remaining various units and devices in the system process these control signals. Referring to fig. 2, in some other embodiments, the collection unit includes a voltage collection module, a current collection module, a temperature collection module, a humidity collection module, a frost collection module, a pressure collection module, and the like. The energy storage system comprises a BMS battery management module.
Furthermore, in order to better prevent liquid impact, the refrigerating device comprises a liquid storage tank and a vacuumizing device, wherein the liquid storage tank is used for storing a refrigerant, and the vacuumizing device is used for vacuumizing the interior of the liquid storage tank. Before the variable-frequency refrigeration control system of the cold-chain container runs, the interior of the liquid storage tank is vacuumized and treated, so that the refrigerant at the evaporator end can be completely gasified.
Furthermore, in order to better realize the frequency conversion function, the frequency conversion refrigeration control system of the cold-chain container further comprises a contactor, wherein the operation end of the contactor is connected between the filter circuit and the rectification circuit, and the signal receiving end of the contactor is connected with the control unit. In other embodiments, the operating terminal of the contactor is connected between the voltage input terminal and the filter circuit, and the signal receiving terminal of the contactor is connected to the control unit. The control unit is also used for detecting whether the phase sequence of the voltage input by the voltage input end is correct, if so, the control unit controls the system to normally operate, and if not, the control unit controls the contactor to realize automatic phase change. The control unit realizes the automatic phase-changing function required by the frequency-conversion refrigeration by controlling the on-off of the contactor.
Further, in order to better view the operation information of the cold-chain container, the cold-chain container variable-frequency refrigeration control system also comprises a display unit connected with the control unit and used for inputting external information and/or reading internal information. The display unit reads the system signals acquired by the acquisition unit from the control unit and also reads historical system signals recorded in the control unit from the control unit, and the display unit can comprise an input module which is used for inputting commands for inquiring the system signals and/or the historical system signals, outputting the system signals and the historical system signals into data packets and exporting the data packets to the outside of the system through a hardware interface. The input module of the display unit can also be used for inputting control signals, setting the threshold value of system signals or setting the target temperature and the target humidity of the variable-frequency refrigeration control system of the cold-chain container.
Furthermore, in order to realize remote monitoring/control of the variable-frequency refrigeration control system for the cold-chain container, the variable-frequency refrigeration control system for the cold-chain container further comprises a communication unit, and the communication unit is used for sending system state information to a remote monitoring device/remote monitoring center. The communication unit comprises at least one of a 4G module, a 5G module and a Wi-Fi module, and can realize the function of the Internet of things, so that the remote monitoring equipment/remote monitoring center can monitor various system state information in the variable-frequency refrigeration system of the cold-chain container in real time and deal with emergency situations or other problems in time. The system state information includes environmental information, and also includes related information, current operating state information, fault information, operation logs, and cargo information. The variable-frequency refrigeration control system for the cold-chain container further comprises a positioning unit, and the communication unit is combined to provide the geographical position information of the cold-chain container to the remote monitoring equipment/remote monitoring center.
Furthermore, the variable-frequency refrigeration control system for the cold-chain container further comprises a voltage transformation unit, wherein the voltage transformation unit is connected between the voltage input end and the control unit and is used for providing a second working voltage for the control unit. In some embodiments, a switching power supply is further provided between the voltage transformation unit and the control unit.
Further, in order to enable the control unit to normally work when no voltage is input, the variable-frequency refrigeration control system for the cold-chain container further comprises a secondary battery, wherein the secondary battery is used for storing a second working voltage provided by the voltage transformation unit and providing the second working voltage for the control unit when no voltage is input at the voltage input end.
Furthermore, the variable-frequency refrigeration control system for the cold-chain container further comprises a driving circuit, the driving circuit is arranged between the control unit and the inverter circuit, the control unit outputs a control signal to the driving circuit, and the driving circuit drives the inverter circuit to control the refrigeration device to perform variable-frequency refrigeration. In some embodiments, the control unit is connected to the driving circuit through a 485 communication interface. In other embodiments, the refrigeration device further comprises an evaporator fan and a condenser fan, the control unit is connected with and controls the refrigeration device, and the control unit controls the operation of the evaporator fan and the operation of the condenser fan.
The invention discloses a cold chain container in a second embodiment, which comprises the cold chain container variable-frequency refrigeration control system in the first embodiment.
By implementing the invention, the following beneficial effects are achieved:
the invention provides a cold chain container and a variable frequency refrigeration control system thereof, wherein the system comprises a variable frequency refrigeration unit, an energy storage unit, a control unit and a signal acquisition unit for acquiring a system; the variable-frequency refrigeration unit comprises a voltage input end, a filter circuit, a rectification circuit, an inverter circuit and a refrigeration device which are connected in sequence; the control unit is connected with the voltage input end and used for receiving the system signal acquired by the acquisition unit and outputting a control signal to the inverter circuit according to the system signal; the energy storage unit is arranged in front of the inverter circuit and used for providing a first working voltage for the refrigerating device when no voltage is input to the voltage input end; the system signals comprise a temperature signal, a gaseous refrigerant pressure signal, a humidity signal, an operation voltage signal and an operation current signal in the container. The system monitors various signals in the system by acquiring various system signals, and performs corresponding operation adjustment through the control unit. The system can realize accurate temperature control, economy, energy conservation and power-off heat preservation of the cold chain container.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above embodiments or technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention, that is, the embodiments described in "some embodiments" can be freely combined with any of the above and below embodiments; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (10)
1. The utility model provides a cold chain container frequency conversion refrigeration control system which characterized in that includes:
the variable-frequency refrigeration unit comprises a voltage input end, a filter circuit, a rectification circuit, an inverter circuit and a refrigeration device which are connected in sequence;
the acquisition unit is used for acquiring system signals; the system signal comprises at least one of a temperature signal in the container, a gaseous refrigerant pressure signal, a humidity signal in the container, an operation voltage signal and an operation current signal;
the control unit is connected with the voltage input end and used for receiving the system signal acquired by the acquisition unit and outputting a control signal to the inverter circuit according to the system signal;
and the energy storage unit is arranged in front of the inverter circuit and used for providing a first working voltage for the refrigerating device when no voltage is input at the voltage input end.
2. The variable-frequency refrigeration control system for the cold-chain container according to claim 1, wherein the refrigeration device comprises a liquid storage tank and a vacuum-pumping device, the liquid storage tank is used for storing the refrigerant, and the vacuum-pumping device is used for performing vacuum-pumping treatment on the interior of the liquid storage tank.
3. The variable frequency refrigeration control system for the cold-chain container according to claim 1, further comprising a contactor, wherein an operation end of the contactor is connected between the voltage input end and the filter circuit, and a signal receiving end of the contactor is connected to the control unit.
4. The frequency conversion refrigeration control system for the cold-chain container according to claim 3, wherein the control unit is further configured to detect whether the phase sequence of the voltage input from the voltage input terminal is correct, if so, the control unit controls the system to operate normally, and if not, the control unit sends a phase conversion signal to the signal receiving terminal to control the contactor to implement automatic phase conversion.
5. The variable frequency refrigeration control system of a cold-chain container according to claim 1, further comprising a display unit connected to the control unit for inputting external information and/or reading internal information.
6. The variable frequency refrigeration control system for a cold-chain container of claim 1, further comprising a communication unit for sending system status information to a remote monitoring device.
7. The variable frequency refrigeration control system for a cold-chain container of claim 1 further comprising a voltage transformation unit connected between said voltage input and said control unit for providing a second operating voltage to said control unit.
8. The variable frequency refrigeration control system for a cold-chain container of claim 1, further comprising a secondary battery for providing a second operating voltage to said control unit when no voltage is input to said voltage input.
9. The system of claim 1, further comprising a driving circuit, wherein a driving circuit is disposed between the control unit and the inverter circuit, the control unit outputs the control signal to the driving circuit, and the driving circuit drives the inverter circuit to control the refrigeration device to perform variable-frequency refrigeration.
10. A cold-chain container, comprising the variable-frequency refrigeration control system of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211438859.1A CN115854609A (en) | 2022-11-17 | 2022-11-17 | Cold chain container and variable frequency refrigeration control system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211438859.1A CN115854609A (en) | 2022-11-17 | 2022-11-17 | Cold chain container and variable frequency refrigeration control system thereof |
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| Publication Number | Publication Date |
|---|---|
| CN115854609A true CN115854609A (en) | 2023-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211438859.1A Pending CN115854609A (en) | 2022-11-17 | 2022-11-17 | Cold chain container and variable frequency refrigeration control system thereof |
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| Country | Link |
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| CN (1) | CN115854609A (en) |
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- 2022-11-17 CN CN202211438859.1A patent/CN115854609A/en active Pending
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