Refrigeration system and control method thereof, refrigeration house, electronic device and storage medium

Abstract

The application discloses a refrigeration system and a control method thereof, a refrigeration house, electronic equipment and a storage medium, and belongs to the technical field of energy-saving refrigeration equipment. The system comprises a compressor unit, a condenser, a throttling element and an evaporator which are connected in sequence. The compressor unit comprises a high-pressure stage compressor and a low-temperature compressor. The output end of the low-temperature compressor is connected with the input end of the high-pressure stage compressor. At least two storerooms are arranged. Each evaporator is provided with two output ends which are connected with a high-temperature gas return vertical pipe and a low-temperature gas return vertical pipe through electromagnetic valves respectively. The input end of each evaporator is connected with an air inlet main pipe through the throttling element. The output end of the high-temperature gas return vertical pipe is connected with the input end of the high-pressure stage compressor. The output end of the low-temperature gas return vertical pipe is connected with the input end of the low-temperature compressor. The controller is switched to the corresponding compression mode according to the temperature requirement of each storeroom. The application solves the problems of gas return cross talk, fixed compression mode and temperature zone binding in the prior art.

Description

Technical Field

[0001] This invention relates to the field of energy-saving refrigeration equipment technology, and in particular to a refrigeration system and its control method, a cold storage, electronic equipment and storage medium. Background Technology

[0002] Existing cold storage refrigeration systems typically collect the return gas from multiple evaporators into a single return gas header. Because the evaporation temperatures and pressures differ between high-temperature and low-temperature storage rooms, the low-pressure return gas from the low-temperature storage room can easily lower the evaporation pressure in the high-temperature storage room. This results in a forced decrease in the evaporation temperature of the high-temperature storage room, an unreasonable heat exchange temperature difference, an increased compression ratio, and increased power consumption per unit of refrigeration capacity.

[0003] Meanwhile, traditional parallel compressor units mostly use a fixed single-stage compression method. Under the operating conditions of a cryogenic storage facility, the compressor pressure ratio may exceed the reasonable range, leading to increased exhaust temperature, poorer lubrication conditions, and a higher failure rate. If a two-stage compressor unit is configured separately for the cryogenic storage facility, it will increase equipment investment, occupy machine room space, and increase piping complexity.

[0004] For cold storage facilities that require both high and low temperatures or variable temperatures, traditional systems typically require all warehouses covered by the same unit to maintain the same or similar evaporation pressure. When one warehouse needs to operate at a low temperature, other warehouses may also be forced to lower their evaporation temperature, creating temperature zone binding. This makes it difficult to independently control the temperature of variable-temperature warehouses, resulting in energy waste and limited applicability. Summary of the Invention

[0005] To address the technical problems of return gas crosstalk, fixed compression mode, and temperature zone binding in existing technologies, this invention provides a refrigeration system and its control method, a cold storage facility, electronic equipment, and a storage medium.

[0006] To achieve the above-mentioned objectives, the present invention employs the following technical solution: The first aspect of the present invention discloses a refrigeration system, comprising: a controller and a compressor unit, a condenser, a throttling element and an evaporator arranged in a warehouse, which are connected in sequence. The compressor unit includes a high-pressure stage compressor and a cryogenic compressor; the output end of the cryogenic compressor is connected to the input end of the high-pressure stage compressor. At least two storage rooms are provided; each evaporator has two output ends, which are respectively connected to the high-temperature return gas riser and the low-temperature return gas riser through solenoid valves; the input end of each evaporator is respectively connected to the main gas inlet pipe through a throttling element. The output end of the high-temperature return gas riser is connected to the input end of the high-pressure stage compressor; the output end of the low-temperature return gas riser is connected to the input end of the low-temperature compressor. The controller is electrically connected to the throttling element, solenoid valve and compressor unit, and is used to switch to the corresponding compression mode according to the temperature requirements of each warehouse.

[0007] According to the refrigeration system, the high-temperature return gas riser is equipped with a high-temperature main valve, and the low-temperature return gas riser is equipped with a low-temperature main valve.

[0008] According to the refrigeration system, a one-way valve is provided between the output end of the cryogenic compressor and the input end of the high-pressure stage compressor to prevent the refrigerant input to the high-pressure stage compressor from flowing into the cryogenic compressor.

[0009] A second aspect of the present invention discloses a control method applied to the aforementioned refrigeration system, comprising the following steps: Obtain the required storage temperature for each warehouse; Determine the system's operating condition based on the temperature requirements of all warehouses; Switch to the appropriate compression mode based on the system's operating conditions.

[0010] According to the control method described above, determining the system's operating condition based on the temperature requirements of all warehouses includes: When the temperature requirement of all warehouses is at the first temperature threshold, it is considered a high-temperature operating condition. When the temperature requirement of all warehouses is at the second temperature threshold, it is a low-temperature operating condition; When there are warehouses with both the first temperature threshold requirement and the second temperature threshold requirement, it is a mixed operating condition. The first temperature threshold is greater than the second temperature threshold.

[0011] According to the control method described above, when the operating condition is high temperature, all solenoid valves connected to the high temperature return gas riser are opened, all solenoid valves connected to the low temperature return gas riser are closed, the high-pressure stage compressor is run, and the low temperature compressor is shut down. When operating at low temperature, open all solenoid valves connected to the low temperature return gas riser, close all solenoid valves connected to the high temperature return gas riser, and run the high-pressure stage compressor and the low temperature compressor. When operating under mixed conditions, the warehouse requiring the first temperature threshold opens the solenoid valve connected to the high-temperature return gas riser and closes the solenoid valve connected to the low-temperature return gas riser; the warehouse requiring the second temperature threshold opens the solenoid valve connected to the low-temperature return gas riser and closes the solenoid valve connected to the high-temperature return gas riser; and the high-pressure stage compressor and the low-temperature compressor are operated.

[0012] According to the control method, the throttling element corresponding to the warehouse with the first temperature threshold requirement is adjusted to the corresponding opening degree; the throttling element corresponding to the warehouse with the second temperature threshold requirement is adjusted to the corresponding opening degree.

[0013] A third aspect of the present invention discloses a cold storage facility, including the aforementioned refrigeration system.

[0014] The fourth aspect of the present invention discloses an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program implements the above-described control method when loaded onto the processor.

[0015] The fifth aspect of the present invention discloses a storage medium comprising a stored program, wherein the program controls the device where the storage medium is located to execute the control method described above during runtime.

[0016] Compared with the prior art, the beneficial effects of the present invention include at least the following: This invention separates the return gas paths of warehouses with different temperature requirements by setting up independent low-temperature return gas risers and high-temperature return gas risers, thereby reducing crosstalk between return gas pressures. It controls the start-up and shutdown of the low-temperature compressor under different compression modes, which can reduce the redundant power consumption of the compressor unit and lower the single-stage compression ratio. When there are warehouses with different temperature requirements, it can achieve independent control of different temperature zones, thus taking into account high-temperature energy saving, low-temperature high efficiency and load adaptability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the refrigeration system of the present invention.

[0019] Figure 2 This is a flowchart of the control method for the refrigeration system of the present invention.

[0020] In the picture: 1. High-pressure stage compressor; 2. Low-temperature compressor; 3. Warehouse; 4. High-temperature return air riser; 5. Low-temperature return air riser; 6. Main intake manifold; 7. Condenser; 8. High-temperature main valve; 9. Low-temperature main valve; 10. Check valve; 11. Oil separator; 12. Liquid reservoir. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this invention.

[0022] In the description of this invention, it should be noted that the terms "front," "rear," "inner," "outer," "right," "left," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] Embodiment 1 of the present invention provides a refrigeration system, including: a controller and a compressor unit, a condenser 7, a throttling element and an evaporator located in a storage room 3, which are connected in sequence.

[0025] The compressor unit includes a high-pressure compressor 1 and a cryogenic compressor 2; the output end of the cryogenic compressor 2 is connected to the input end of the high-pressure compressor 1.

[0026] At least two storage rooms 3 are provided; each evaporator is provided with two output ends, which are respectively connected to the high temperature return gas riser 4 and the low temperature return gas riser 5 through solenoid valves; the input end of each evaporator is respectively connected to the main air inlet pipe 6 through a throttling element.

[0027] The output end of the high-temperature return gas riser 4 is connected to the input end of the high-pressure stage compressor 1; the output end of the low-temperature return gas riser 5 is connected to the input end of the low-temperature compressor 2.

[0028] The controller is electrically connected to the throttling element, solenoid valve and compressor unit, and is used to switch to the corresponding compression mode according to the temperature requirements of each warehouse 3.

[0029] This invention separates the return gas paths of warehouses with different temperature requirements by setting up independent low-temperature return gas risers and high-temperature return gas risers, thereby reducing crosstalk between return gas pressures. It controls the start-up and shutdown of the low-temperature compressor under different compression modes, which can reduce the redundant power consumption of the compressor unit and lower the single-stage compression ratio. When there are warehouses with different temperature requirements, it can achieve independent control of different temperature zones, thus taking into account high-temperature energy saving, low-temperature high efficiency and load adaptability.

[0030] Preferably, but not limitingly, the high-temperature return gas riser 4 is provided with a high-temperature main valve 8, and the low-temperature return gas riser 5 is provided with a low-temperature main valve 9.

[0031] This invention improves system stability by setting up a high-temperature main valve and a low-temperature main valve. When the refrigeration system needs to close all solenoid valves connected to the low-temperature return gas riser, the low-temperature main valve is closed simultaneously. Conversely, when the refrigeration system needs to close all solenoid valves connected to the high-temperature return gas riser, the high-temperature main valve is closed simultaneously.

[0032] Preferably, but not limitingly, a one-way valve 10 is provided between the output end of the cryogenic compressor 2 and the input end of the high-pressure stage compressor 1 to prevent the refrigerant input to the high-temperature return gas riser 4 from flowing into the cryogenic compressor 2.

[0033] This invention, by setting a one-way valve, can prevent the refrigerant input from the high-temperature return gas riser to the high-pressure stage compressor from flowing into the low-temperature compressor.

[0034] like Figure 1 As shown, Embodiment 2 of the present invention provides a preferred embodiment of a refrigeration system, including: a controller and a compressor unit, a condenser 7, a throttling element and an evaporator located in a storage room 3, which are connected in sequence.

[0035] The compressor unit includes a high-pressure compressor 1 and a cryogenic compressor 2; the output end of the cryogenic compressor 2 is connected to the input end of the high-pressure compressor 1.

[0036] At least two storage rooms 3 are provided; each evaporator is provided with two output ends, which are respectively connected to the high temperature return gas riser 4 and the low temperature return gas riser 5 through solenoid valves; the input end of each evaporator is respectively connected to the main air inlet pipe 6 through a throttling element.

[0037] The output end of the high-temperature return gas riser 4 is connected to the input end of the high-pressure stage compressor 1; the output end of the low-temperature return gas riser 5 is connected to the input end of the low-temperature compressor 2.

[0038] The controller is electrically connected to the throttling element, solenoid valve and compressor unit, and is used to switch to the corresponding compression mode according to the temperature requirements of each warehouse 3.

[0039] The high-temperature return gas riser 4 is equipped with a high-temperature main valve 8, and the low-temperature return gas riser 5 is equipped with a low-temperature main valve 9.

[0040] A one-way valve 10 is provided between the output end of the cryogenic compressor 2 and the input end of the high-pressure stage compressor 1 to prevent the refrigerant input to the high-temperature return gas riser 4 from flowing into the cryogenic compressor 2.

[0041] An oil separator 11 is provided between the compressor unit and the condenser 7, and a liquid receiver 12 is provided between the condenser 7 and the intake manifold 6.

[0042] like Figure 2 As shown, Embodiment 3 of the present invention provides a control method applied to the aforementioned refrigeration system, comprising the following steps: Step S310: Obtain the temperature requirements of each warehouse 3.

[0043] Step S320: Determine the operating condition of the system based on the temperature requirements of all warehouses 3.

[0044] Step S330: Switch to the appropriate compression mode according to the operating conditions of the system.

[0045] Preferably, but not limitingly, determining the system's operating condition based on the temperature requirements of all warehouses 3 includes: When the temperature requirement of all warehouses 3 is the first temperature threshold, it is a high-temperature operating condition.

[0046] When the temperature requirement of all warehouses 3 is the second temperature threshold, it is a low-temperature operating condition.

[0047] When there are both warehouses with the first temperature threshold requirement and warehouses with the second temperature threshold requirement, it is a mixed operating condition.

[0048] The first temperature threshold is greater than the second temperature threshold.

[0049] Preferably, but not limitingly, when the operating condition is high temperature, all solenoid valves connected to the high temperature return gas riser 4 are opened, all solenoid valves connected to the low temperature return gas riser 5 are closed, the high pressure stage compressor 1 is run, and the low temperature compressor 2 is shut down. When operating at low temperature, open all solenoid valves connected to the low temperature return gas riser 5, close all solenoid valves connected to the high temperature return gas riser 4, and run the high-pressure stage compressor 1 and the low temperature compressor 2. When operating under mixed conditions, the warehouse 3 with the first temperature threshold requirement opens the solenoid valve connected to the high-temperature return gas riser 4 and closes the solenoid valve connected to the low-temperature return gas riser 5; the warehouse 3 with the second temperature threshold requirement opens the solenoid valve connected to the low-temperature return gas riser 5 and closes the solenoid valve connected to the high-temperature return gas riser 4; and the high-pressure stage compressor 1 and the low-temperature compressor 2 are operated.

[0050] Preferably, but not limitingly, the throttling element corresponding to the warehouse 3 with the first temperature threshold requirement is adjusted to the corresponding opening degree; the throttling element corresponding to the warehouse 3 with the second temperature threshold requirement is adjusted to the corresponding opening degree.

[0051] Embodiment 4 of the present invention provides a preferred embodiment of a control method applied to the aforementioned refrigeration system, comprising the following steps: Step S410: Obtain the temperature requirements of each warehouse 3.

[0052] Step S420: Determine the operating condition of the system based on the temperature requirements of all warehouses 3.

[0053] Step S430: Switch to the appropriate compression mode according to the operating conditions of the system.

[0054] The step of determining the system's operating condition based on the temperature requirements of all warehouses 3 includes: When the required temperature for all warehouses 3 is 0℃, it is considered a high-temperature operating condition.

[0055] When the required temperature for all warehouses 3 is -18℃, it is considered a low-temperature operating condition.

[0056] When there is both a warehouse 3 requiring 0℃ and a warehouse 3 requiring -18℃, it is a mixed operating condition.

[0057] When operating at high temperature, open all solenoid valves connected to the high temperature return gas riser 4, close all solenoid valves connected to the low temperature return gas riser 5, run the high-pressure stage compressor 1, and shut down the low temperature compressor 2. When operating at low temperature, open all solenoid valves connected to the low temperature return gas riser 5, close all solenoid valves connected to the high temperature return gas riser 4, and run the high-pressure stage compressor 1 and the low temperature compressor 2. When operating under mixed conditions, the 0℃ required storage room 3 opens the solenoid valve connected to the high-temperature return gas riser 4 and closes the solenoid valve connected to the low-temperature return gas riser 5; the -18℃ required storage room 3 opens the solenoid valve connected to the low-temperature return gas riser 5 and closes the solenoid valve connected to the high-temperature return gas riser 4; and the high-pressure stage compressor 1 and the low-temperature compressor 2 are operated.

[0058] Preferably, but not limitingly, the throttling element corresponding to the warehouse 3 with 0°C requirement is adjusted to the corresponding opening degree; the throttling element corresponding to the warehouse 3 with -18°C requirement is adjusted to the corresponding opening degree.

[0059] Embodiment 5 of the present invention provides a cold storage, including the refrigeration system described above.

[0060] Embodiment 6 of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is loaded onto the processor, it implements the control method described above.

[0061] Embodiment 7 of the present invention provides a storage medium storing a computer program that, when executed by a processor, implements the control method disclosed in the present invention.

[0062] Storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Storage media can be, for example, but not limited to, electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination thereof. More specific examples of storage media (a non-exhaustive list) include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination thereof. Storage media as used herein is not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0063] The computer-readable program instructions described herein can be downloaded from storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper cables, fiber optic cables, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to storage media within the respective computing / processing device.

[0064] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A refrigeration system, characterized in that, include: The controller and the compressor unit, condenser (7), throttling element and evaporator located in the warehouse (3) are connected in sequence. The compressor unit includes a high-pressure compressor (1) and a low-temperature compressor (2); the output end of the low-temperature compressor (2) is connected to the input end of the high-pressure compressor (1); At least two warehouses (3) are provided; each evaporator is provided with two output ends, which are connected to the high temperature return gas riser (4) and the low temperature return gas riser (5) respectively through solenoid valves; the input end of each evaporator is connected to the main gas inlet pipe (6) respectively through a throttling element; The output end of the high-temperature return gas riser (4) is connected to the input end of the high-pressure stage compressor (1); the output end of the low-temperature return gas riser (5) is connected to the input end of the low-temperature compressor (2). The controller is electrically connected to the throttling element, solenoid valve and compressor unit, and is used to switch to the corresponding compression mode according to the temperature requirements of each warehouse (3).

2. The refrigeration system according to claim 1, characterized in that: The high-temperature return gas riser (4) is equipped with a high-temperature main valve (8), and the low-temperature return gas riser (5) is equipped with a low-temperature main valve (9).

3. The refrigeration system according to claim 1, characterized in that: A one-way valve (10) is provided between the output end of the cryogenic compressor (2) and the input end of the high-pressure compressor (1) to prevent the refrigerant input from the high-temperature return gas riser (4) to the high-pressure compressor (1) from flowing into the cryogenic compressor (2).

4. A control method applied to the refrigeration system according to any one of claims 1-3, characterized in that, Includes the following steps: Obtain the temperature requirements of each warehouse (3); Based on the temperature requirements of all warehouses (3), determine the operating condition of the system; Switch to the appropriate compression mode based on the system's operating conditions.

5. The control method according to claim 4, characterized in that, The step of determining the system's operating condition based on the temperature requirements of all warehouses (3) includes: When the temperature requirement of all warehouses (3) is the first temperature threshold, it is a high-temperature working condition; When the temperature requirement of all warehouses (3) is the second temperature threshold, it is a low temperature operating condition; When there are warehouses (3) with both the first temperature threshold requirement and the second temperature threshold requirement, it is a mixed working condition; The first temperature threshold is greater than the second temperature threshold.

6. The control method according to claim 5, characterized in that: When the operating condition is high temperature, open all solenoid valves connected to the high temperature return gas riser (4), close all solenoid valves connected to the low temperature return gas riser (5), run the high pressure stage compressor (1), and shut down the low temperature compressor (2). When the operating condition is low temperature, open all solenoid valves connected to the low temperature return gas riser (5), close all solenoid valves connected to the high temperature return gas riser (4), and run the high pressure stage compressor (1) and the low temperature compressor (2). When in mixed operating conditions, the warehouse (3) with the first temperature threshold requirement opens the solenoid valve connected to the high temperature return gas riser (4) and closes the solenoid valve connected to the low temperature return gas riser (5); the warehouse (3) with the second temperature threshold requirement opens the solenoid valve connected to the low temperature return gas riser (5) and closes the solenoid valve connected to the high temperature return gas riser (4); and the high pressure stage compressor (1) and the low temperature compressor (2) are operated.

7. The control method according to claim 5, characterized in that: The throttling element corresponding to the warehouse (3) with the first temperature threshold requirement is adjusted to the corresponding opening degree; the throttling element corresponding to the warehouse (3) with the second temperature threshold requirement is adjusted to the corresponding opening degree.

8. A cold storage facility, characterized in that: Includes the refrigeration system as described in any one of claims 1-3.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the computer program is loaded into the processor, it implements the control method according to any one of claims 4-7.

10. A storage medium, characterized in that: The storage medium includes a stored program, wherein, when the program is executed, it controls the device containing the storage medium to perform the control method according to any one of claims 4-7.

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