Double-refrigerating-system unit with single compressor capable of sharing double condensers and control method of double-refrigerating-system unit
By adopting a structure with a single compressor sharing a dual condenser and a three-way valve control method in a dual refrigeration system, the refrigerant mixing problem was solved, and the system efficiency and compressor life in single refrigeration mode were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-23
- Publication Date
- 2026-04-14
Smart Images
Figure CN121855077A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of refrigeration and air conditioning control, specifically proposing a dual refrigeration system unit that can adaptively switch between single or dual refrigeration modes, and an operation control method for sharing two sets of condensers when the single refrigeration system is running at low load. Background Technology
[0002] Currently, dual-refrigeration system units typically have two sets of independently operating and control equipment components, as shown in the appendix. Figure 1 As shown (of course, the structural forms may vary between different manufacturers; this diagram is only for illustrating the system composition), each equipment component includes an evaporator, a condenser, a compressor, and a throttling device, etc.; the refrigeration cycle is as follows: Figure 2 As shown, the two refrigeration systems operate independently without interfering with each other. When the system load is high, both sets of equipment components operate independently; when the system load is low, only one set of refrigeration systems can operate, while the other set of refrigeration systems is in a stopped state.
[0003] Existing dual-refrigeration system units have low operating efficiency in single-refrigeration mode, primarily because one set of condensers is idle and not in operation. To improve system efficiency by using both sets of condensers simultaneously, the technical challenge of preventing refrigerant crosstalk and mixing between the two sets of components must first be addressed. Specifically, when one set of components is not operating, its condenser stores the refrigerant required for that refrigeration system; while the other set of components is operating, refrigerant enters both sets of condensers, inevitably causing mixing. This mixed refrigerant then enters one compressor in the operating set, reducing the refrigerant in the idle set and increasing the refrigerant in the operating set. This affects the overall unit operating efficiency in dual-refrigeration mode and may even impact compressor lifespan. Furthermore, the above problems become particularly complex when switching between single-refrigeration and dual-refrigeration modes. Switching from single-refrigeration to dual-refrigeration mode requires ensuring that refrigerant from the operating set does not enter the idle set; similarly, switching from dual-refrigeration to single-refrigeration mode requires ensuring that refrigerant from the idle set does not enter the operating set.
[0004] Therefore, to solve the aforementioned technical challenges, comprehensive innovations and safeguards must be proposed for the overall operation and control process of the system unit (including but not limited to the initial startup of the unit, the switching from single-cooling to dual-cooling mode during operation, the switching from dual-cooling to single-cooling mode, and the shutdown phase). In view of this, this application is hereby submitted. Summary of the Invention
[0005] The dual refrigeration system unit and its control method with a single compressor sharing dual condensers described in this application aim to solve the problems existing in the prior art by symmetrically connecting a set of three-way valves at the input and output ends of a set of condensers. This effectively isolates the two sets of refrigerants in single refrigeration mode, thereby realizing adaptive switching between single refrigeration and dual refrigeration modes. Under the premise of ensuring that the refrigerants in the two sets of equipment components operate independently, without crosstalk or mixing, the energy efficiency in single refrigeration mode is significantly improved.
[0006] To achieve the above-mentioned objectives, the dual refrigeration system unit with a single compressor sharing dual condensers includes two sets of independently operable and controllable equipment components. Each set of equipment components includes a compressor and an evaporator, a condenser and a throttling device connected sequentially through a refrigerant circulation pipeline. A first three-way valve is connected to the refrigerant inlet of the second condenser, and the first refrigerant outlet C of the first three-way valve is connected to the refrigerant inlet of the first condenser when it is open. A second three-way valve is connected to the refrigerant outlet of the second condenser, and the first refrigerant outlet C of the second three-way valve is connected to the refrigerant outlet of the first condenser when it is open.
[0007] Furthermore, the valve core inside the first three-way valve and the second three-way valve switches between the refrigerant inlet A, the first refrigerant outlet C, and the second refrigerant outlet B. The refrigerant flowing through the first three-way valve and the second three-way valve has four operating states: the valve core moves to the second refrigerant outlet B and closes it, at which point the refrigerant flows unidirectionally from A to C; the valve core moves to the first refrigerant outlet C and closes it, at which point the refrigerant flows unidirectionally from A to B; the valve core moves between the first refrigerant outlet C and the second refrigerant outlet B, with both outlets open, at which point the refrigerant flows unidirectionally from A to B and A to C simultaneously; and the valve core moves to the refrigerant inlet A and closes it, at which point the refrigerant flows unidirectionally from C to B.
[0008] Furthermore, the first evaporator and the second evaporator are two relatively independent devices, or two relatively enclosed sets of pipe channels in the same evaporator, each with its own refrigerant flow; the first condenser and the second condenser are two relatively independent devices, or two relatively enclosed sets of pipe channels in the same condenser, each with its own refrigerant flow.
[0009] Based on the above-mentioned dual refrigeration system unit with a single compressor sharing dual condensers, this application also proposes the following control method for the dual refrigeration system unit with a single compressor sharing dual condensers: In the two sets of independently operating and controlled equipment components, a channel with controllable opening and closing status is established between the refrigerant inlet and refrigerant outlet of the two sets of condensers respectively; in the single refrigeration operation mode, the refrigerant flows through the two sets of condensers in the operating and non-operating equipment components simultaneously.
[0010] Furthermore, before switching from single-cooling to dual-cooling operation mode, the compressor in the separately operating equipment component is switched to heating mode and the throttling device is closed to transfer the refrigerant inside the condenser to the evaporator or other liquid storage device, thereby ensuring that the refrigerant in the two refrigeration systems does not mix.
[0011] Furthermore, when switching from dual-cooling to single-cooling operation mode, the compressor in the equipment component equipped with a three-way valve is switched to heating mode and the throttling device is closed to store the refrigerant inside the condenser into the evaporator or other liquid storage device, thereby ensuring that the refrigerant in the two refrigeration systems does not mix.
[0012] Furthermore, the control method for a dual refrigeration system unit with a single compressor that can share dual condensers includes the following implementation stages: Phase 1: Before system unit startup; The valve core of the first three-way valve moves to the refrigerant inlet A and closes it, allowing refrigerant to flow unidirectionally from the first refrigerant outlet C to the second refrigerant outlet B; the valve core of the second three-way valve moves to the second refrigerant outlet B and closes it, allowing refrigerant to flow unidirectionally from the refrigerant inlet A to the first refrigerant outlet C; the first throttling device and the second throttling device remain closed; Phase Two: Initial Start-up of the System Units; The system unit starts up in cooling-only mode upon initial startup; While the first compressor and the first throttling device are running, the second compressor remains shut down, and the first three-way valve, the second three-way valve, and the second throttling device remain at their default settings before the system unit was started. The high-temperature gaseous refrigerant discharged from the first compressor enters the first condenser and the first three-way valve respectively. The refrigerant entering the first three-way valve flows through the first refrigerant outlet C to the second refrigerant outlet B and enters the second condenser. After heat exchange in the second condenser, one path of refrigerant flows through the second three-way valve from the refrigerant inlet A to the first refrigerant outlet C and merges with another path of refrigerant that has also completed heat exchange in the first condenser, and they both enter the first throttling device. After passing through the first throttling device, the low-temperature liquid refrigerant becomes gaseous refrigerant after heat exchange in the first evaporator and finally flows back to the first compressor to form a refrigeration cycle. After running for a period of time, the system determines whether the unit's outlet water temperature has reached the preset first threshold; if so, it continues to operate in single cooling mode; if not, it proceeds to the following stage three. Phase 3: Switch from single-cooling to dual-cooling operation mode; First, the first compressor continues to run but switches to heating mode, and the first throttling device is closed. The refrigerant in the first condenser and the second condenser is stored in the first evaporator under the suction of the first compressor. This process continues for a period of time, and the refrigerant in the second condenser is emptied. Then, the valve cores of both the first three-way valve and the second three-way valve move to the first refrigerant outlet C and close it. At this time, the refrigerant flows unidirectionally from the refrigerant inlet A to the second refrigerant outlet B. Finally, the first compressor switches to cooling mode, and the second compressor starts and runs in cooling mode at the same time. The first throttling device and the second throttling device are opened simultaneously, and the equipment components of the two sets of refrigeration systems operate independently. When the system load decreases, the first compressor continues to operate at its current operating frequency, while the second compressor operates at a reduced frequency. After operating for a period of time, when the system load continues to decrease, it transitions to the following stage four. Phase 4: Switching from dual-cooling to single-cooling operation mode; First, the second compressor continues to run but switches to heating mode, and the second throttling device is closed. The refrigerant in the second condenser is stored in the second evaporator under the suction of the second compressor. This process continues for a period of time, and the refrigerant in the second condenser is emptied. Then, the valve core of the first three-way valve moves to the refrigerant inlet A and closes it, at which time the refrigerant flows unidirectionally from C to B; the valve core of the second three-way valve moves to the second refrigerant outlet B and closes it, at which time the refrigerant flows unidirectionally from A to C. Finally, the second compressor and the second throttling device are shut down. The high-temperature gaseous refrigerant discharged from the first compressor enters the first condenser and the first three-way valve respectively. The refrigerant entering the first three-way valve flows through the first refrigerant outlet C to the second refrigerant outlet B and enters the second condenser. One path of refrigerant after heat exchange in the second condenser merges with another path of refrigerant after heat exchange in the first condenser through the channel from refrigerant inlet A to first refrigerant outlet C in the second three-way valve, and they both enter the first throttling device. The low-temperature liquid refrigerant after passing through the first throttling device becomes gaseous refrigerant after heat exchange in the first evaporator, and finally flows back to the first compressor to form a single-system refrigeration cycle. As the system load continues to decrease, the first compressor operates at a reduced frequency. Phase 5: After running for a period of time, the system determines whether the unit's outlet water temperature has reached the preset second threshold. If not, the first compressor continues to operate at reduced frequency. If so, the first compressor and the first throttling device are shut down, and the first three-way valve and the second three-way valve remain unchanged from the previous moment. At this time, the first throttling device, the first three-way valve, and the second three-way valve are in the same state as the unit before the start-up of the system in Phase 1.
[0013] In summary, this application has the following beneficial effects and advantages compared with the prior art: 1. This application can adaptively switch between single cooling and dual cooling modes according to the real-time load changes of the system, and can also make full use of the condenser of another set of non-operating equipment components in the single cooling mode, which can significantly improve the system operating efficiency in the single cooling mode.
[0014] 2. When switching between single and dual cooling modes, this application can ensure that the refrigerant in the two sets of equipment components does not crosstalk or mix into each other's pipelines, which is conducive to the balance of operating efficiency of each set of equipment components, while protecting core components such as compressors from damage. Attached Figure Description
[0015] The present application will now be further described in conjunction with the following figures; Figure 1 This is a schematic diagram of the structure of an existing dual-refrigeration system unit; Figure 2 This is a schematic diagram of the operation of an existing dual-refrigeration system unit; Figure 3 This is a schematic diagram of the structure and dual-cooling mode operation of the dual refrigeration system unit with a single compressor that can share dual condensers as described in this application; Figure 4 This is a schematic diagram of operation in single cooling mode; Figures 5 to 8 These are comparative diagrams showing the three-way valve in different open and closed states; Figure 9 This is a schematic diagram showing the refrigerant stored in the first evaporator when switching from single-cooling to dual-cooling mode. Figure 10 This is a schematic diagram showing the refrigerant stored in the second evaporator when switching from dual-cooling to single-cooling mode. In the above figures, there are a first compressor 11, a second compressor 12, a first evaporator 21, a second evaporator 22, a first condenser 31, a second condenser 32, a first throttling device 41, a second throttling device 42, a first three-way valve 51, a second three-way valve 52, a valve core 53, a first liquid storage tank 61, a second liquid storage tank 62, and an electrical control device 7. Detailed Implementation
[0016] The technical solution proposed in this application will be clearly and completely described below with reference to the accompanying drawings. For those skilled in the art, the described embodiments are merely a part of, and not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the following embodiments without inventive effort should fall within the protection scope of this application.
[0017] Furthermore, although certain terms are used in this description, such as “first,” “second,” “upper,” “lower,” “left,” and “right,” those skilled in the art will understand that these terms are merely for the convenience of explanation and are not intended to provide specific or restrictive descriptions of the technical solutions.
[0018] Example 1, such as Figures 3 to 9As shown, this application proposes a dual refrigeration system unit with a single compressor that can share dual condensers, comprising two sets of equipment components that can be operated and controlled independently. Each set of equipment components includes a compressor and an evaporator, a condenser and a throttling device connected in sequence through a refrigerant circulation pipeline.
[0019] Specifically, the first set of equipment components is controlled by the electrical control device 7, and includes a first compressor 11, a first condenser 31, a first throttling device 41 and a first evaporator 21 in the direction of refrigerant flow. The refrigerant flows back to the first compressor 11 via the first evaporator 21. The second set of equipment components is also controlled by the electrical control device 7. According to the refrigerant flow direction, it includes the second compressor 12, the second condenser 32, the second throttling device 42, and the second evaporator 22. The refrigerant flows back to the second compressor 12 through the second evaporator 22. To improve the flexibility and energy efficiency of the design of the above-mentioned dual refrigeration system unit, the first evaporator 21 and the second evaporator 22 are two relatively independent devices, or two relatively closed pipeline channels in the same evaporator, each with its own refrigerant flow. Based on the same design concept, the first condenser 31 and the second condenser 32 are two relatively independent devices, or two relatively closed sets of pipeline channels in the same condensing device, each flowing with refrigerant. The first throttling device 41 and the second throttling device 42 throttle the refrigerant to reduce its flow rate and temperature. When the refrigeration system is shut down, the first throttling device 41 and the second throttling device 42 are normally closed, and the refrigerant in the pipeline does not flow.
[0020] The first three-way valve 51 is connected to the refrigerant inlet of the second condenser 32, and the first refrigerant outlet C of the first three-way valve 51 is connected to the refrigerant inlet of the first condenser 31 when it is open. The refrigerant outlet of the second condenser 32 is connected to the second three-way valve 52, and the first refrigerant outlet C of the second three-way valve 52 is connected to the refrigerant outlet of the first condenser 31 when it is open. The first three-way valve 51 and the second three-way valve 52 are provided inside the valve body with a refrigerant inlet A, a first refrigerant outlet C and a second refrigerant outlet B for one-way refrigerant flow, and a valve core 53 for opening or closing the refrigerant inlet A, the first refrigerant outlet C and the second refrigerant outlet B; inside the valve body, the valve core 53 switches between the refrigerant inlet A, the first refrigerant outlet C and the second refrigerant outlet B to change the flow direction of the refrigerant when it passes through the valve body.
[0021] like Figures 5 to 8 As shown, both the first three-way valve 51 and the second three-way valve 52 have four operating states; the first state is as follows: Figure 5Valve core 53 moves to the second refrigerant outlet B and closes it, at which point the refrigerant flows unidirectionally from A to C; the second type... Figure 6 Valve core 53 moves to the first refrigerant outlet C and closes it, at which point the refrigerant flows unidirectionally from A to B; the third type... Figure 7 Valve core 53 moves to the position between the first refrigerant outlet C and the second refrigerant outlet B, with both outlets open. At this time, the refrigerant flows unidirectionally from A→B and A→C simultaneously; the fourth type... Figure 8 Valve core 53 moves to refrigerant inlet A and closes it, at which point the refrigerant flows unidirectionally from C to B.
[0022] Based on the system architecture of the above-mentioned dual refrigeration system unit with a single compressor that can share dual condensers, this application proposes the following operation control method: In the two independently operating and controlled equipment components, controllable open / closed channels are established between the refrigerant inlets and outlets of the two condenser units. In single-refrigeration operation mode, the refrigerant flows simultaneously through both condenser units in the operating and non-operating equipment components. This allows for full utilization of the condenser of the other non-operating equipment component in low-load single-refrigeration system operation mode, achieving simultaneous heat exchange through two condensers when the single compressor is running, significantly improving the efficiency of the single refrigeration unit under low-load conditions.
[0023] To more effectively avoid the problem of refrigerant crosstalk and mixing, when switching from single refrigeration to dual refrigeration operation mode, the compressor (first compressor 11) in the separately operating equipment component is switched to heating mode and the throttling device (first throttling device 41) is closed, so as to transfer the refrigerant inside the condenser (first condenser 31) to the evaporator (first evaporator 21) or other liquid storage device, thereby ensuring that the refrigerants in the two refrigeration systems do not mix.
[0024] When switching from dual-cooling to single-cooling operation mode, the compressor (second compressor 12) in the equipment assembly equipped with three-way valves (first three-way valve 51 and second three-way valve 52) is switched to heating mode and the throttling device (second throttling device 42) is closed to store the refrigerant inside the condenser (second condenser 32) into the evaporator (second evaporator 22) or other liquid storage device, thereby ensuring that the refrigerants in the two refrigeration systems do not mix.
[0025] The aforementioned dual-refrigeration system operation control method includes the following implementation stages: Phase 1: Before system unit startup; like Figure 8 As shown, the valve core 53 of the first three-way valve 51 moves to the refrigerant inlet A and closes it, allowing the refrigerant to flow unidirectionally from the first refrigerant outlet C to the second refrigerant outlet B, i.e., a single channel flow from C to B; as shown... Figure 5As shown, the valve core 53 of the second three-way valve 52 moves to the second refrigerant outlet B and closes it, and the refrigerant flows unidirectionally from the refrigerant inlet A to the first refrigerant outlet C, that is, A→C flow; the first throttling device 41 and the second throttling device 42 remain closed; Phase Two: Initial Start-up of the System Units; The system unit starts up in cooling-only mode upon initial startup; While the first compressor 11 and the first throttling device 41 are running, the second compressor 12 remains stopped, and the first three-way valve 51, the second three-way valve 52 and the second throttling device 42 remain at their default settings before the system unit was started. like Figure 4 As shown, the high-temperature gaseous refrigerant discharged from the first compressor 11 enters the first condenser 31 and the first three-way valve 51 respectively. The refrigerant entering the first three-way valve 51 flows through the first refrigerant outlet C to the second refrigerant outlet B and enters the second condenser 32. After heat exchange in the second condenser 32, one path of refrigerant flows through the second three-way valve 52 from the refrigerant inlet A to the first refrigerant outlet C and merges with another path of refrigerant after heat exchange in the first condenser 31, and they both enter the first throttling device 41. After passing through the first throttling device 41, the low-temperature liquid refrigerant becomes gaseous refrigerant after heat exchange in the first evaporator 21, and finally flows back to the first compressor 11 to form a refrigeration cycle. After running for a period of time, the system determines whether the unit's outlet water temperature has reached the preset first threshold; if so, it continues to operate in single cooling mode; if not, it proceeds to the following stage three. Phase 3: Switch from single-cooling to dual-cooling operation mode; First, such as Figure 9 As shown, the first compressor 11 continues to run but switches to heating mode, and the first throttling device 41 is closed. The refrigerant in the first condenser 31 and the second condenser 32 is stored in the first evaporator 21 under the suction of the first compressor 11. This process continues for a period of time, and the refrigerant in the second condenser 32 is emptied, thereby preventing the refrigerant of the first refrigeration system from entering the second refrigeration system in the subsequent dual refrigeration operation mode. This avoids the refrigerant of the first and second refrigeration systems from mixing, which could lead to uneven distribution in the subsequent dual refrigeration operation mode, affecting the unit's operating efficiency and even the compressor's service life. Then, as Figure 6 As shown, the valve cores 53 of the first three-way valve 51 and the second three-way valve 52 both move to the first refrigerant outlet C and close it. At this time, the refrigerant flows unidirectionally from the refrigerant inlet A to the second refrigerant outlet B, that is, A→B flow. Finally, the first compressor 11 switches to cooling mode, and the second compressor 12 starts and operates in cooling mode simultaneously. The first throttling device 41 and the second throttling device 42 open synchronously, and the equipment components of the two refrigeration systems operate independently; the refrigeration cycle is as follows: Figure 3 As shown; When the system load decreases, the first compressor 11 continues to operate at its current operating frequency, while the second compressor 12 operates at a reduced frequency. After operating for a period of time, when the system load continues to decrease, it transitions to the following stage four. Phase 4: Switching from dual-cooling to single-cooling operation mode; First, such as Figure 10 As shown, the second compressor 12 continues to run but switches to heating mode, and the second throttling device 42 is closed. The refrigerant in the second condenser 32 is stored in the second evaporator 22 under the suction of the second compressor 12. This process continues for a period of time, and the refrigerant in the second condenser 32 is emptied, thereby preventing the refrigerant of the second refrigeration system from entering the first refrigeration system in the subsequent single refrigeration operation mode. This avoids the refrigerant of the first and second refrigeration systems from mixing, which could lead to uneven distribution in the subsequent dual refrigeration operation mode, affecting the unit's operating efficiency and even the compressor's service life. Then, as Figure 8 As shown, the valve core 53 of the first three-way valve 51 moves to the refrigerant inlet A and closes it, at which point the refrigerant flows unidirectionally from C to B; as Figure 5 As shown, the valve core 53 of the second three-way valve 52 moves to the second refrigerant outlet B and closes it. At this time, the refrigerant flows unidirectionally from A to C. Finally, as Figure 4 As shown, the second compressor 12 and the second throttling device 42 are shut down; the high-temperature gaseous refrigerant discharged from the first compressor 11 enters the first condenser 31 and the first three-way valve 51 respectively. The refrigerant entering the first three-way valve 51 flows through the first refrigerant outlet C to the second refrigerant outlet B and enters the second condenser 32; one path of refrigerant after heat exchange in the second condenser 32 merges with another path of refrigerant after heat exchange in the first condenser 31 through the refrigerant inlet A to the first refrigerant outlet C channel in the second three-way valve 22, and they both enter the first throttling device 41; the low-temperature liquid refrigerant after passing through the first throttling device 41 becomes gaseous refrigerant after heat exchange in the first evaporator 21, and finally flows back to the first compressor 11 to form a single-system refrigeration cycle; As the system load continues to decrease, the first compressor 11 operates at a reduced frequency. Phase 5: After running for a period of time, the system determines whether the unit's outlet water temperature has reached the preset second threshold. If not, the first compressor 11 continues to operate at a reduced frequency. If so, the first compressor 11 and the first throttling device 41 are shut down. The first three-way valve 51 and the second three-way valve 52 remain unchanged from the previous moment. At this time, the first throttling device 41, the first three-way valve 51, and the second three-way valve 52 are in the same state as before the unit started in Phase 1.
[0026] It should be noted that those skilled in the art can make changes and modifications to the above-described embodiments. Therefore, this application is not limited to the specific embodiments described above, and any obvious improvements, substitutions, or modifications made by those skilled in the art based on this application shall fall within the protection scope of this application.
Claims
1. A dual refrigeration system unit with a single compressor that can share dual condensers, characterized in that: It includes two sets of independently operable and controllable equipment components. Each set of equipment components consists of a compressor and evaporator, a condenser and a throttling device connected in sequence through a refrigerant circulation pipeline. A first three-way valve is connected to the refrigerant inlet of the second condenser, and the first refrigerant outlet C of the first three-way valve is connected to the refrigerant inlet of the first condenser when it is open. A second three-way valve is connected to the refrigerant outlet of the second condenser. The first refrigerant outlet C of the second three-way valve is connected to the refrigerant outlet of the first condenser when it is in the open state.
2. The dual refrigeration system unit with a single compressor that can share dual condensers according to claim 1, characterized in that: The first three-way valve and the second three-way valve have valve cores inside their valve bodies that switch between refrigerant inlet A, first refrigerant outlet C and second refrigerant outlet B. The refrigerant has four working states when it flows through the first three-way valve and the second three-way valve. The process includes: the valve core moving to the second refrigerant outlet B and closing it, at which point the refrigerant flows unidirectionally from A to C; the valve core moving to the first refrigerant outlet C and closing it, at which point the refrigerant flows unidirectionally from A to B; the valve core moving between the first refrigerant outlet C and the second refrigerant outlet B, with both outlets open, at which point the refrigerant flows unidirectionally from A to B and A to C simultaneously; and the valve core moving to the refrigerant inlet A and closing it, at which point the refrigerant flows unidirectionally from C to B.
3. The dual refrigeration system unit with a single compressor that can share dual condensers according to claim 1, characterized in that: The first evaporator and the second evaporator are two relatively independent devices, or two relatively enclosed sets of pipelines in the same evaporator, each with its own refrigerant flow. The first condenser and the second condenser are two relatively independent devices, or two relatively enclosed sets of pipelines in the same condensing device, each with its own refrigerant flow.
4. A control method for a dual refrigeration system unit with a single compressor sharing dual condensers as described in any one of claims 1 to 3, characterized in that: In the two sets of independently operating and controlled equipment components, a controllable open / closed channel is established between the refrigerant inlet and refrigerant outlet of the two sets of condensers; in the single refrigeration operation mode, the refrigerant flows through the two sets of condensers in the operating and non-operating equipment components simultaneously.
5. The control method for a dual refrigeration system unit with a single compressor that can share dual condensers according to claim 4, characterized in that: Before switching from single-cooling to dual-cooling operation mode, the compressor in the separately operating equipment component is switched to heating mode and the throttling device is closed to transfer the refrigerant inside the condenser to the evaporator or other liquid storage device, thereby ensuring that the refrigerant in the two refrigeration systems does not mix.
6. The control method for a dual refrigeration system unit with a single compressor that can share dual condensers according to claim 4, characterized in that: When switching from dual-cooling to single-cooling operation mode, the compressor in the equipment component equipped with a three-way valve is switched to heating mode and the throttling device is closed to store the refrigerant inside the condenser into the evaporator or other liquid storage device, thereby ensuring that the refrigerant in the two refrigeration systems does not mix.
7. The control method for a dual refrigeration system unit with a single compressor that can share dual condensers according to claim 4, characterized in that: The implementation phases include the following: Phase 1: Before system unit startup; The valve core of the first three-way valve moves to the refrigerant inlet A and closes it, allowing refrigerant to flow unidirectionally from the first refrigerant outlet C to the second refrigerant outlet B; the valve core of the second three-way valve moves to the second refrigerant outlet B and closes it, allowing refrigerant to flow unidirectionally from the refrigerant inlet A to the first refrigerant outlet C; the first throttling device and the second throttling device remain closed; Phase Two: Initial Start-up of the System Units; The system unit starts up in cooling-only mode upon initial startup; While the first compressor and the first throttling device are running, the second compressor remains shut down, and the first three-way valve, the second three-way valve, and the second throttling device remain at their default settings before the system unit was started. The high-temperature gaseous refrigerant discharged from the first compressor enters the first condenser and the first three-way valve respectively. The refrigerant entering the first three-way valve flows through the first refrigerant outlet C to the second refrigerant outlet B and enters the second condenser. After heat exchange in the second condenser, one path of refrigerant flows through the second three-way valve from the refrigerant inlet A to the first refrigerant outlet C and merges with another path of refrigerant that has also completed heat exchange in the first condenser, and they both enter the first throttling device. After passing through the first throttling device, the low-temperature liquid refrigerant becomes gaseous refrigerant after heat exchange in the first evaporator and finally flows back to the first compressor to form a refrigeration cycle. After running for a period of time, the system determines whether the unit's outlet water temperature has reached the preset first threshold; if so, it continues to operate in single cooling mode; if not, it proceeds to the following stage three. Phase 3: Switch from single-cooling to dual-cooling operation mode; First, the first compressor continues to run but switches to heating mode, and the first throttling device is closed. The refrigerant in the first condenser and the second condenser is stored in the first evaporator under the suction of the first compressor. This process lasts for a period of time, during which the refrigerant in the second condenser is emptied. Then, the valve cores of both the first three-way valve and the second three-way valve move to the first refrigerant outlet C and close it. At this time, the refrigerant flows unidirectionally from the refrigerant inlet A to the second refrigerant outlet B. Finally, the first compressor switches to cooling mode, and the second compressor starts and runs in cooling mode at the same time. The first throttling device and the second throttling device are opened simultaneously, and the equipment components of the two sets of refrigeration systems operate independently. When the system load decreases, the first compressor continues to operate at its current operating frequency, while the second compressor operates at a reduced frequency. After operating for a period of time, when the system load continues to decrease, it transitions to the following stage four. Phase 4: Switching from dual-cooling to single-cooling operation mode; First, the second compressor continues to run but switches to heating mode, and the second throttling device is closed. The refrigerant in the second condenser is stored in the second evaporator under the suction of the second compressor. This process lasts for a period of time, during which the refrigerant in the second condenser is emptied. Then, the valve core of the first three-way valve moves to the refrigerant inlet A and closes it, at which time the refrigerant flows unidirectionally from C to B; the valve core of the second three-way valve moves to the second refrigerant outlet B and closes it, at which time the refrigerant flows unidirectionally from A to C. Finally, the second compressor and the second throttling device are shut down. The high-temperature gaseous refrigerant discharged from the first compressor enters the first condenser and the first three-way valve respectively. The refrigerant entering the first three-way valve flows through the first refrigerant outlet C to the second refrigerant outlet B and enters the second condenser. One path of refrigerant after heat exchange in the second condenser merges with another path of refrigerant after heat exchange in the first condenser through the channel from refrigerant inlet A to first refrigerant outlet C in the second three-way valve, and they both enter the first throttling device. The low-temperature liquid refrigerant after passing through the first throttling device becomes gaseous refrigerant after heat exchange in the first evaporator, and finally flows back to the first compressor to form a single-system refrigeration cycle. As the system load continues to decrease, the first compressor operates at a reduced frequency. Phase 5: After running for a period of time, the system determines whether the unit's outlet water temperature has reached the preset second threshold. If not, the first compressor continues to operate at reduced frequency. If so, the first compressor and the first throttling device are shut down, and the first three-way valve and the second three-way valve remain unchanged from the previous moment. At this time, the first throttling device, the first three-way valve, and the second three-way valve are in the same state as the unit before the start-up of the system in Phase 1.