Oil return control method and device of dual-cold-source unit, temperature control equipment and storage medium

Abstract

The embodiment of the application discloses a kind of oil return control method, device, temperature control equipment and storage medium of double cold source unit, double cold source unit includes compressor, four-way valve, shell and tube heat exchanger, fin heat exchanger, evaporative condenser, double cold source switching valve and the heating defrosting electromagnetic valve of setting on fin heat exchanger refrigerant outflow pipeline;Double cold source unit includes refrigeration mode and heating mode;The oil return control method of double cold source unit includes: in refrigeration mode, periodically control heating defrosting electromagnetic valve to open, to make the lubricating oil accumulated in fin heat exchanger with refrigerant flow back to the refrigeration cycle of unit.The technical scheme of the embodiment of the application can periodically bring back the lubricating oil remaining in fin heat exchanger to refrigeration cycle, solve the oil leakage problem in the refrigeration process of double cold source unit, make unit operation more stable, improve the reliability and service life of unit.

Description

Technical Field

[0001] This invention relates to the field of air conditioning equipment technology, and in particular to a method, device, temperature control equipment and storage medium for oil return control of a dual-source cooling unit. Background Technology

[0002] Dual-source chiller units typically include two condensers, with a dual-source switching valve enabling switching between cooling and heating modes. In cooling mode, the refrigerant flows through the evaporator-condenser for condensation and heat dissipation, while the finned heat exchanger does not participate in heat exchange.

[0003] However, the lubricating oil in the compressor will circulate with the refrigerant, remain and accumulate in the finned heat exchanger, and cannot return to the compressor, resulting in a reduction in the amount of circulating oil in the unit, which affects the reliability and service life of the unit. Summary of the Invention

[0004] This invention provides a method, device, temperature control equipment, and storage medium for oil return control of dual-source cooling units, in order to solve the problem that lubricating oil accumulated in the finned heat exchanger of a dual-source cooling unit cannot return to the compressor.

[0005] According to one aspect of the present invention, a method for controlling the oil return of a dual-source cooling unit is provided. The dual-source cooling unit includes a compressor, a four-way valve, a shell-and-tube heat exchanger, a finned heat exchanger, an evaporator-condenser, a dual-source switching valve, and a heating-defrosting solenoid valve disposed on the refrigerant outlet pipe of the finned heat exchanger. The dual-source cooling unit includes a cooling mode and a heating mode. The method for controlling the oil return of the dual-source cooling unit includes: In the cooling mode, the heating defrosting solenoid valve is periodically opened so that the lubricating oil accumulated in the finned heat exchanger flows back to the unit's cooling cycle along with the refrigerant.

[0006] Optionally, in the cooling mode, the heating defrosting solenoid valve is periodically opened to allow the lubricating oil accumulated in the finned heat exchanger to flow back into the unit's refrigeration cycle with the refrigerant, including: In the cooling mode, the heating defrosting solenoid valve is repeatedly opened for a second preset duration at a first preset time interval.

[0007] Optionally, in the cooling mode, before periodically controlling the opening of the heating defrosting solenoid valve to allow the lubricating oil accumulated in the finned heat exchanger to flow back into the unit's refrigeration cycle with the refrigerant, the method further includes: When the cooling mode is activated, the heating defrosting solenoid valve is controlled to open for a third preset duration.

[0008] Optionally, the second preset duration and the third preset duration are equal.

[0009] Optionally, in the cooling mode, the heating defrosting solenoid valve is periodically opened to allow the lubricating oil accumulated in the finned heat exchanger to flow back into the unit's refrigeration cycle with the refrigerant, further comprising: The four-way valve is controlled to close, and the dual cold source switching valve is controlled to open. The evaporator-condenser acts as a condenser, and the shell-and-tube heat exchanger acts as an evaporator.

[0010] Optionally, the oil return control method for dual-source chillers also includes: In the heating mode, the four-way valve is opened and the dual cold source switching valve is closed. The shell and tube heat exchanger acts as a condenser and the finned heat exchanger acts as an evaporator.

[0011] According to another aspect of the present invention, an oil return control device for a dual-source cooling unit is also provided, applied to a dual-source cooling unit, the dual-source cooling unit including a compressor, a four-way valve, a shell-and-tube heat exchanger, a finned heat exchanger, an evaporator-condenser, a dual-source switching valve, and a heating-defrosting solenoid valve disposed on the refrigerant outlet pipeline of the finned heat exchanger; the dual-source cooling unit includes a cooling mode and a heating mode; the oil return control device for the dual-source cooling unit includes: The mode determination module is used to determine the operating mode of the dual-source chiller unit; The oil return control module is used to periodically control the opening of the heating defrosting solenoid valve in the cooling mode so that the lubricating oil accumulated in the finned heat exchanger flows back to the refrigeration cycle of the unit along with the refrigerant.

[0012] According to another aspect of the present invention, a temperature control device is also provided, the temperature control device comprising: a dual-source cooling unit, an oil return control device for the dual-source cooling unit, and at least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor, which enables the at least one processor to perform the oil return control method for dual-source cooling units according to any embodiment of the present invention.

[0013] According to another aspect of the present invention, a computer-readable storage medium is also provided, the computer-readable storage medium storing computer instructions for causing a processor to execute the oil return control method of the dual-source cooling unit described in any embodiment of the present invention.

[0014] The technical solution of this invention, when the dual-source cooling unit is in cooling mode, periodically controls the opening of the heating defrosting solenoid valve, allowing the lubricating oil accumulated in the finned heat exchanger to flow back into the unit's refrigeration cycle along with the refrigerant. This technical solution periodically brings the lubricating oil retained in the finned heat exchanger back into the refrigeration cycle, solving the oil leakage problem during the cooling process of the dual-source cooling unit, making the unit's operation more stable, and improving its reliability and service life.

[0015] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a dual-cooling-source unit provided in an embodiment of the present invention; Figure 2 This is a flowchart of an oil return control method for a dual-source cooling unit provided in an embodiment of the present invention; Figure 3 This is a flowchart of another oil return control method for a dual-source cooling unit provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of an oil return control device for a dual-source cooling unit provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the temperature control equipment for implementing the oil return control method of the dual-cooling-source unit in this embodiment of the invention. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0019] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0020] Figure 1 This is a schematic diagram of the structure of a dual-cooling-source unit provided in an embodiment of the present invention. Figure 2 This is a flowchart illustrating an oil return control method for a dual-source chiller unit provided in an embodiment of the present invention. This embodiment is applicable to dual-source chiller units and refrigeration systems seeking high reliability and energy efficiency. The method can be executed by an oil return control device for the dual-source chiller unit, which can be implemented in hardware and / or software. Figure 1 As shown, the dual-source cooling unit includes a compressor 1, a four-way valve 2, a shell-and-tube heat exchanger 3, a finned heat exchanger 4, an evaporator-condenser 5, a dual-source switching valve 6, and a heating defrosting solenoid valve 7 installed on the refrigerant outlet pipe of the finned heat exchanger 4; the dual-source cooling unit includes a cooling mode and a heating mode; as shown... Figure 2 As shown, the oil return control method for dual-source cooling units includes: S101. In cooling mode, the heating defrosting solenoid valve 7 is periodically opened so that the lubricating oil accumulated in the finned heat exchanger 4 flows back to the unit's cooling cycle along with the refrigerant.

[0021] The dual-source chiller unit includes two condensers: an evaporative condenser 5 and a shell-and-tube heat exchanger 3. It has both cooling and heating modes. In cooling mode, the evaporative condenser 5 acts as the condenser, the shell-and-tube heat exchanger 3 acts as the evaporator, and the finned heat exchanger 4 does not participate in heat exchange. However, in cooling mode, the finned heat exchanger 4 and its connecting pipes are on the low-pressure side. The heating defrost solenoid valve 7, located on the refrigerant outlet pipe of the finned heat exchanger 4, is closed. Therefore, the lubricating oil remaining in the finned heat exchanger pipes and inside cannot flow back to the compressor 1 with the refrigerant. As the oil accumulates, it cannot return to the refrigeration cycle, resulting in a reduction in the unit's circulating oil volume. The heating defrost solenoid valve 7 can be periodically opened. When the heating defrost solenoid valve 7 is opened, some refrigerant gas flows into the finned heat exchanger 4, and the lubricating oil accumulated in the finned heat exchanger 4 mixes with the refrigerant and returns to the refrigeration cycle.

[0022] Specifically, the heating defrosting solenoid valve 7 can be set to open periodically and remain open for a preset time to carry out the accumulated lubricating oil, which then flows into the refrigeration cycle pipeline and eventually back to the compressor 1. After the preset time, the heating defrosting solenoid valve 7 closes, restoring the normal refrigeration cycle. For example, the heating defrosting solenoid valve 7 can be set to open for 30 seconds every 6 minutes.

[0023] The technical solution of this invention, when the dual-source cooling unit is in cooling mode, periodically controls the opening of the heating defrosting solenoid valve, allowing the lubricating oil accumulated in the finned heat exchanger to flow back into the unit's refrigeration cycle along with the refrigerant. This technical solution periodically brings the lubricating oil retained in the finned heat exchanger back into the refrigeration cycle, solving the oil leakage problem during the cooling process of the dual-source cooling unit, making the unit's operation more stable, and improving its reliability and service life.

[0024] In some alternative embodiments of the present invention, reference continues to be made. Figure 1 In cooling mode, the heating defrosting solenoid valve 7 is periodically opened to allow the lubricating oil accumulated in the finned heat exchanger 4 to flow back into the unit's refrigeration cycle with the refrigerant, including: In cooling mode, the heating defrosting solenoid valve 7 is repeatedly opened for a second preset duration at a first preset time interval.

[0025] The first preset time interval can be the time interval between two openings of the heating defrost solenoid valve 7. The second preset duration can be the duration for which the heating defrost solenoid valve 7 is open. The first preset time interval and the second preset duration cannot be set too short or too long. If the first preset time interval is set too short, high-pressure gas may be diverted from the main refrigeration circuit, potentially increasing refrigeration energy consumption. If the first preset time interval is set too long, a lot of oil may accumulate in the finned heat exchanger 4, causing compressor 1 to lack oil. If the second preset duration is set too short, the accumulated lubricating oil may not flow with the refrigerant. If the second preset duration is set too long, it may increase refrigeration energy consumption. For example, if the first preset time interval is set to 6 minutes and the second preset duration to 30 seconds, then starting from the refrigeration mode, the heating defrost solenoid valve 7 will be opened for 30 seconds every 6 minutes, and then closed.

[0026] Figure 3 This is a flowchart of another oil return control method for a dual-source chiller provided in an embodiment of the present invention, see reference. Figure 2 and Figure 3 In some optional embodiments of the present invention, for S101, in cooling mode, the heating defrosting solenoid valve is periodically opened to add a step before the lubricating oil accumulated in the finned heat exchanger flows back to the unit's refrigeration cycle with the refrigerant. The oil return control method for the dual-source cooling unit includes: When the cooling mode is started, S201 controls the heating defrost solenoid valve to open for a third preset time.

[0027] When the cooling mode is first activated, the finned heat exchanger may have accumulated a large amount of lubricating oil in the heating mode, which needs to be addressed promptly. The third preset duration can be the duration for which the heating defrost solenoid valve is open when the cooling mode is activated. Similarly, the third preset duration should not be set too short or too long.

[0028] S202. In cooling mode, the heating defrosting solenoid valve is periodically opened so that the lubricating oil accumulated in the finned heat exchanger flows back to the unit's refrigeration cycle along with the refrigerant.

[0029] In some optional embodiments of the present invention, the second preset duration and the third preset duration are equal.

[0030] The second and third preset durations are equal, meaning the initial oil return during cooling mode startup and the periodic oil return during operation result in the same opening duration of the heating defrost solenoid valve. The second preset duration is the periodic control duration of the heating defrost solenoid valve's opening during cooling mode operation, for example, opening once every 10 minutes for 30 seconds each time. The third preset duration is the initial opening duration of the heating defrost solenoid valve when cooling mode starts, for example, opening for 30 seconds upon startup. By standardizing the single opening time of the heating defrost solenoid valve, control complexity is reduced.

[0031] In some alternative embodiments of the present invention, reference continues to be made. Figure 1 In cooling mode, the heating defrosting solenoid valve 7 is periodically opened to allow the lubricating oil accumulated in the finned heat exchanger 4 to flow back into the unit's refrigeration cycle along with the refrigerant. This also includes: Control the four-way valve 2 to close, control the dual cold source switching valve 6 to open, the evaporator condenser 5 to act as the condenser, and the shell and tube heat exchanger 3 to act as the evaporator.

[0032] The system controls the four-way valve 2 to close and the dual-source switching valve 6 to open. The high-temperature, high-pressure refrigerant gas discharged from the compressor 1 bypasses the four-way valve 2 and flows through the dual-source switching valve 6 to the evaporator-condenser 5. The condensed liquid refrigerant, after throttling, enters the shell-and-tube heat exchanger 3 to absorb heat from the chilled water, thus achieving refrigeration. The heating defrost solenoid valve 7 is located on the outlet pipe of the finned heat exchanger 4. By periodically opening the heating defrost solenoid valve 7, a small amount of high-pressure gas enters the finned heat exchanger 4, causing the lubricating oil accumulated in the finned heat exchanger 4 to flow back into the unit's refrigeration cycle with the refrigerant, and ultimately back to the compressor 1.

[0033] In some alternative embodiments of the present invention, reference continues to be made. Figure 1 The oil return control method for dual-source cooling units also includes: In heating mode, control the four-way valve 2 to open, control the dual cold source switching valve 6 to close, the shell and tube heat exchanger 3 acts as the condenser, and the finned heat exchanger 4 acts as the evaporator.

[0034] In heating mode, the four-way valve 2 is opened, and the dual-cold-source switching valve 6 is closed. The refrigerant does not flow through the evaporator-condenser 5, but instead flows through the shell-and-tube heat exchanger 3 and the finned heat exchanger 4 via the open four-way valve 2, thus achieving the heating function. The refrigerant releases heat to the outside environment in the shell-and-tube heat exchanger 3, condensing from a gaseous state to a liquid state. The liquid refrigerant absorbs heat from the outside environment in the finned heat exchanger 4, evaporating back into a gaseous state, thereby achieving heating. When defrosting is required, the heating defrosting solenoid valve 7 is opened, allowing high-temperature refrigerant to flow into the finned heat exchanger 4 for defrosting. The finned heat exchanger 4 has a large surface area and high heat exchange efficiency, and can absorb heat from the low-temperature environment in heating mode.

[0035] The working principle of this invention embodiment is as follows: Figure 1 As shown, the dual-source cooling unit also includes an oil separator 8, a refrigerant regulating valve 9, a first sight glass 10, an ejector oil return solenoid valve 11, a first intermediate liquid injection solenoid valve 12, a second intermediate liquid injection solenoid valve 13, a suction liquid injection solenoid valve 14, a heating balance valve 15, a first one-way valve 16, a second one-way valve 17, a safety valve 18, a charging valve 19, a dryer filter 20, an economizer 21, an ECO electronic expansion valve 22, a second sight glass 23, and a main electronic expansion valve 24. In heating mode, the four-way valve 2 is opened, and the dual-source cooling switching valve 6 is closed. The refrigerant flows through the four-way valve 2 through the shell-and-tube heat exchanger 3 and the finned heat exchanger 4. The shell-and-tube heat exchanger 3 acts as a condenser, and the finned heat exchanger 4 acts as an evaporator. The refrigerant releases heat to the outside in the shell-and-tube heat exchanger 3, condensing from a gaseous state to a liquid state. The liquid refrigerant absorbs heat from the outside in the finned heat exchanger 4, evaporating back into a gaseous state, thus achieving heating. When defrosting is required, the heating defrost solenoid valve 7 is opened, allowing high-temperature refrigerant to flow into the finned heat exchanger 4 for defrosting. In cooling mode, the four-way valve 2 is closed, and the dual-source switching valve 6 is opened, with the evaporator-condenser 5 acting as the condenser and the shell-and-tube heat exchanger 3 acting as the evaporator. The high-temperature, high-pressure refrigerant gas discharged from the compressor 1 flows to the evaporator-condenser 5 through the dual-source switching valve 6. The condensed liquid refrigerant, after being throttled, enters the shell-and-tube heat exchanger 3 to absorb heat from the chilled water, thereby achieving cooling. The heating defrost solenoid valve 7 is located on the outlet pipe of the finned heat exchanger. By periodically opening the heating defrost solenoid valve 7, a small amount of high-pressure gas enters the finned heat exchanger 4, causing the lubricating oil accumulated in the finned heat exchanger 4 to flow back into the unit's refrigeration cycle with the refrigerant, and thus back to the compressor 1.

[0036] Figure 4 This is a schematic diagram of the structure of an oil return control device for a dual-source chiller provided in an embodiment of the present invention, applied to a dual-source chiller, such as... Figure 1As shown, the dual-source cooling unit includes a compressor 1, a four-way valve 2, a shell-and-tube heat exchanger 3, a finned heat exchanger 4, an evaporator-condenser 5, a dual-source switching valve 6, and a heating defrosting solenoid valve 7 installed on the refrigerant outlet pipe of the finned heat exchanger 4; the dual-source cooling unit includes a cooling mode and a heating mode; as shown... Figure 4 As shown, the oil return control device for the dual-source cooling unit includes: The mode determination module 301 is used to determine the operating mode of the dual-source chiller unit; The oil return control module 302 is used to periodically control the opening of the heating defrosting solenoid valve in cooling mode so that the lubricating oil accumulated in the finned heat exchanger flows back to the unit's refrigeration cycle along with the refrigerant.

[0037] Figure 5 A schematic diagram of a temperature control device 30, which can be used to implement embodiments of the present invention, is shown. The temperature control device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The temperature control device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (such as helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0038] like Figure 5 As shown, the temperature control device 10 includes a dual-source cooling unit, an oil return control device for the dual-source cooling unit, at least one processor 31, and a memory, such as a read-only memory (ROM) 32 or a random access memory (RAM) 13, communicatively connected to the at least one processor 31. The memory stores computer programs executable by the at least one processor. The processor 31 can perform various appropriate actions and processes based on the computer program stored in the ROM 32 or loaded from storage unit 38 into the RAM 13. The RAM 33 can also store various programs and data required for the operation of the temperature control device 30. The processor 31, ROM 32, and RAM 33 are interconnected via a bus 34. An input / output (I / O) interface 35 is also connected to the bus 34.

[0039] Multiple components in the temperature control device 30 are connected to the I / O interface 35, including: an input unit 36, such as a keyboard or mouse; an output unit 37, such as various types of displays or speakers; a storage unit 38, such as a disk or optical disk; and a communication unit 39, such as a network card, modem, or wireless transceiver. The communication unit 39 allows the temperature control device 30 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0040] Processor 31 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 31 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Processor 31 performs the various methods and processes described above, such as the oil return control method for a dual-source chiller unit.

[0041] In some embodiments, the oil return control method for a dual-source chiller unit can be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 38. In some embodiments, part or all of the computer program can be loaded and / or installed on the temperature control device 30 via ROM 32 and / or communication unit 39. When the computer program is loaded into RAM 33 and executed by processor 31, one or more steps of the oil return control method for the dual-source chiller unit described above can be performed. Alternatively, in other embodiments, processor 31 can be configured to perform the oil return control method for the dual-source chiller unit by any other suitable means (e.g., by means of firmware).

[0042] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), complex programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0043] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0044] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0045] To provide user interaction, the systems and techniques described herein can be implemented on a temperature control device having: a display device for displaying information to the user (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor); and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the temperature control device. Other types of devices can also be used to provide user interaction; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0046] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or middleware components (e.g., application servers), or frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0047] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0048] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0049] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for controlling oil return of a dual cold source unit, characterized in that, The dual-source cooling unit includes a compressor, a four-way valve, a shell-and-tube heat exchanger, a finned heat exchanger, an evaporator-condenser, a dual-source switching valve, and a heating-defrosting solenoid valve installed on the refrigerant outlet pipe of the finned heat exchanger. The dual-source chiller unit includes a cooling mode and a heating mode; the oil return control method of the dual-source chiller unit includes: In the cooling mode, the heating defrosting solenoid valve is periodically opened so that the lubricating oil accumulated in the finned heat exchanger flows back to the unit's cooling cycle along with the refrigerant.

2. The oil return control method for a dual-source cooling unit according to claim 1, characterized in that, In the cooling mode, the heating defrosting solenoid valve is periodically opened to allow the lubricating oil accumulated in the finned heat exchanger to flow back into the unit's refrigeration cycle along with the refrigerant, including: In the cooling mode, the heating defrosting solenoid valve is repeatedly opened for a second preset duration at a first preset time interval.

3. The oil return control method for a dual-source cooling unit according to claim 2, characterized in that, In the cooling mode, before the heating defrosting solenoid valve is periodically opened to allow the lubricating oil accumulated in the finned heat exchanger to flow back into the unit's refrigeration cycle with the refrigerant, the following additional steps are also included: When the cooling mode is activated, the heating defrosting solenoid valve is controlled to open for a third preset duration.

4. The oil return control method for a dual-source cooling unit according to claim 3, characterized in that, The second preset duration and the third preset duration are equal.

5. The oil return control method for a dual-source cooling unit according to claim 1, characterized in that, In the cooling mode, the heating defrosting solenoid valve is periodically opened to allow the lubricating oil accumulated in the finned heat exchanger to flow back into the unit's refrigeration cycle along with the refrigerant. The system also includes: The four-way valve is controlled to close, and the dual cold source switching valve is controlled to open. The evaporator-condenser acts as a condenser, and the shell-and-tube heat exchanger acts as an evaporator.

6. The oil return control method for a dual-source cooling unit according to claim 1, characterized in that, Also includes: In the heating mode, the four-way valve is opened and the dual cold source switching valve is closed. The shell and tube heat exchanger acts as a condenser and the finned heat exchanger acts as an evaporator.

7. A return oil control device for a dual-source cooling unit, characterized in that, It is applied to dual-source cooling units, which include a compressor, a four-way valve, a shell-and-tube heat exchanger, a finned heat exchanger, an evaporator-condenser, a dual-source switching valve, and a heating-defrosting solenoid valve installed on the refrigerant outlet pipeline of the finned heat exchanger. The dual-source cooling unit includes a cooling mode and a heating mode; The oil return control device of the dual-source cooling unit includes: The mode determination module is used to determine the operating mode of the dual-source chiller unit; The oil return control module is used to periodically control the opening of the heating defrosting solenoid valve in the cooling mode so that the lubricating oil accumulated in the finned heat exchanger flows back to the refrigeration cycle of the unit along with the refrigerant.

8. A temperature control device, characterized in that, The temperature control equipment includes a dual-source cooling unit, an oil return control device for the dual-source cooling unit, and at least one processor; as well as A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the oil return control method for a dual-source cooling unit as described in any one of claims 1-6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that, when executed by a processor, implement the oil return control method for a dual-source cooling unit as described in any one of claims 1-6.

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