Water chiller-heater unit and control method thereof

Abstract

The invention relates to the technical field of heat pump units, and discloses a water chiller-heater unit and a control method thereof.The water chiller-heater unit breaks through the limitation that a traditional heat pump unit is single in heat source and single in function. The heat supply pipeline unit is matched with the heat supply circulating unit, the cold supply pipeline unit is matched with the cold supply circulating unit, and the cold supply pipeline unit is matched with the heat supply pipeline unit, so that flexible switching of three modes of single heating, single refrigerating and combined cooling and heating is realized, and the cold and hot water requirements in different scenes can be met; the application range and flexibility of the water chiller-heater unit are greatly improved, the problems that a traditional unit is single in working mode and stiff in application are solved, the comprehensive utilization rate of energy is improved, operation energy consumption and cost are reduced, and environment friendliness and application flexibility are enhanced; and meanwhile, one machine has multiple purposes and can replace a traditional combination of a refrigerating unit and a heating unit, so that the equipment investment cost is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of heat pump unit technology, and in particular to a hot and cold water unit and its control method. Background Technology

[0002] Existing conventional water source heat pump units typically use natural heat sources or circulating water heat sources as low-grade heat source inputs. Through the circulation process of the heat pump system, the heat source grade is improved, thereby obtaining medium- to high-grade hot water to meet heating or domestic water needs.

[0003] However, these conventional water source heat pump units generally suffer from insufficient heat source supply and switching capabilities: On the one hand, heat pump units can only rely on a single type of low-grade heat source, either natural or circulating water. When the supply of such a heat source is interrupted or insufficient, they cannot effectively absorb low-grade heat energy, making it difficult to meet heating or domestic water demand. On the other hand, they lack a flexible heat source switching mechanism. When the circulating water heat source is insufficient in winter, they cannot switch to other effective heat sources. In summer, when the circulating water heat source temperature is high and the supply is sufficient, they also find it difficult to switch to that heat source to optimize the energy efficiency ratio. In addition, because the heat source supply mode is singular, the unit cannot dynamically adjust and select the optimal heat source according to the natural environmental heat source conditions, resulting in increased operating energy consumption and a significant reduction in energy-saving effect.

[0004] Meanwhile, these traditional water source heat pump units also suffer from a single cooling and heating mode and cannot supply hot and cold water simultaneously, resulting in insufficient application flexibility. When the ambient temperature rises in summer, the inability to flexibly switch to the circulating water heat source to obtain a higher temperature heat source further increases operating energy consumption, significantly reducing the energy-saving effect.

[0005] In summary, traditional water source heat pump units generally suffer from drawbacks such as a single heat source supply channel, fixed operating mode, insufficient operational flexibility, high energy consumption, high operating costs, and poor environmental friendliness; it is evident that existing technologies still need improvement and enhancement. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of this invention is to provide a hot and cold water unit that not only solves the problems of the single working mode and rigid application of traditional units, but also improves the comprehensive energy utilization rate, reduces operating energy consumption and costs, and enhances environmental friendliness and application flexibility.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A chiller / hot water unit includes a control device and a heat pump mechanism, a user-side circulation mechanism, and a heat source-side circulation mechanism, all electrically connected to the control device. The user-side circulation mechanism includes a heating pipeline unit and a cooling circulation unit, both electrically connected to the control device. The heat source-side circulation mechanism includes a cooling pipeline unit and a heating circulation unit, both electrically connected to the control device. The heating pipeline unit and the cooling circulation unit are connected to the condenser side of the heat pump mechanism. The cooling pipeline unit and the heating circulation unit are connected to the evaporator side of the heat pump mechanism. The cooling circulation unit cooperates with the cooling pipeline unit to provide cooling. The heating pipeline unit cooperates with the heating circulation unit to provide heating. The heating pipeline unit cooperates with the cooling pipeline unit to provide combined cooling and heating.

[0008] In the aforementioned hot and cold water unit, the heat pump mechanism includes a condenser, a dryer filter, an electronic expansion valve, an evaporator, and a compressor electrically connected to the control device; the circulation outlet of the compressor is connected to the refrigeration inlet of the condenser, and the refrigeration outlet of the condenser is connected to the circulation inlet of the compressor through the dryer filter, the electronic expansion valve, and the evaporator connected in sequence; the heating pipeline unit and the cooling circulation unit are respectively connected to the condenser, and the cooling pipeline unit and the heating circulation unit are respectively connected to the evaporator.

[0009] In the aforementioned hot and cold water unit, the heating pipeline unit includes a first filter, a first check valve, and a first electric valve, a second electric valve, a first water pump, a first temperature sensor, a second temperature sensor, and a first flow protector electrically connected to the control device. The input end of the first electric valve is used to connect to the return water port on the user side, and the output end of the first electric valve is connected to the condensing input side of the heat pump mechanism through the first filter, the first water pump, and the first check valve connected in sequence. The condensing output side of the heat pump mechanism is connected to the input end of the second electric valve and the input end of the cooling circulation unit, respectively, and the output end of the second electric valve is used to connect to the water supply port on the user side. The first temperature sensor is located on the condensing input side of the heat pump mechanism, and the second temperature sensor and the first flow protector are located on the condensing output side of the heat pump mechanism.

[0010] In the aforementioned hot and cold water unit, the cooling circulation unit includes a cooling tower and a third electric valve and a fourth electric valve, which are electrically connected to the control device respectively; the cooling tower is connected to the condenser side of the heat pump mechanism through the third electric valve and the fourth electric valve.

[0011] In the aforementioned chilled water unit, the cooling pipeline unit includes a fifth electric valve and a sixth electric valve, which are electrically connected to the control device respectively; the heating circulation unit includes a circulating heat source section and a natural heat source section, which are electrically connected to the control device respectively; the circulating heat source section and the natural heat source section are respectively connected to the evaporator side of the heat pump mechanism, and both are used to provide a low-grade heat source to the heat pump mechanism; the evaporator side of the heat pump mechanism is also connected to the fifth electric valve and the sixth electric valve respectively, and the supply and return water circulation of chilled water is realized through the fifth electric valve and the sixth electric valve.

[0012] In the aforementioned hot and cold water unit, the circulating heat source section includes a heat source tower, an expansion tank, a second check valve, a second filter, an automatic vent valve, and a second water pump, a seventh electric valve, an eighth electric valve, a pressure sensor, a third temperature sensor, a fourth temperature sensor, a fifth temperature sensor, and a second flow protector, all electrically connected to the control device. The evaporation output side of the heat pump mechanism is connected to the seventh electric valve and the input end of the natural heat source section. The output end of the seventh electric valve is connected to the input end of the heat source tower. The output end of the heat source tower is connected to the evaporation input side of the heat pump mechanism via the eighth electric valve, the second filter, the expansion tank, the automatic vent valve, the second water pump, and the second check valve, which are connected in sequence. The output end of the natural heat source section is connected to the input end of the second filter. The third temperature sensor is located on the evaporation input side of the heat pump mechanism. The fourth temperature sensor and the second flow protector are located on the evaporation output side of the heat pump mechanism. The pressure sensor is located on the connecting pipe between the automatic vent valve and the second water pump. The fifth temperature sensor is used to acquire the heat source temperature information within the heat source tower.

[0013] In the aforementioned hot and cold water unit, the natural heat source section includes a heat source water heat exchanger, a third check valve, a third filter, and a third water pump, an eighth electric valve, and a ninth electric valve, all electrically connected to the control device. The input end of the third filter is used to receive natural water, and the output end of the third filter is connected to the water-side inlet of the heat source water heat exchanger via the third water pump and the third check valve, which are connected in sequence. The water-side outlet of the heat source water heat exchanger is used to output natural water. The circulation side of the heat source water heat exchanger is connected to the evaporation output side of the heat pump mechanism via the eighth electric valve, and to the input end of the second filter via the ninth electric valve.

[0014] In the hot and cold water unit, the heat source side circulation mechanism further includes a water replenishment unit. The water replenishment unit includes a fourth check valve and a fourth water pump electrically connected to the control device. The input end of the fourth water pump is used to obtain replenishing liquid, and the output end of the fourth water pump is connected to the circulating heat source section through the fourth check valve.

[0015] In the aforementioned hot and cold water unit, the heat pump mechanism further includes a drainage unit. The drainage unit includes a first drain valve and a second drain valve, which are electrically connected to the control device. The first drain valve is connected to the condenser side of the heat pump mechanism, and the second drain valve is connected to the evaporator side of the heat pump mechanism. Both the first drain valve and the second drain valve are used to discharge wastewater generated during the operation of the hot and cold water unit.

[0016] The present invention also provides a control method for a chilled / hot water unit, the control method being implemented based on any of the chilled / hot water units described above, the control method comprising: acquiring a set operating mode, the operating mode including a single heating mode, a single cooling mode, and a combined heating and cooling mode; when the operating mode is a single heating mode, controlling the cooling pipeline unit and the cooling circulation unit to stop working, providing a low-grade heat source to the evaporator side of the heat pump mechanism through the heating circulation unit, and the condenser side of the heat pump mechanism outputting a high-grade heat source through the heating pipeline unit; when the operating mode is a single heating mode, controlling the cooling pipeline unit and the cooling circulation unit to stop working, providing a low-grade heat source to the evaporator side of the heat pump mechanism through the heating circulation unit, and the cooling circulation unit to stop working; when the operating mode is a single heating mode, controlling the cooling pipeline unit and the cooling circulation unit to stop working, the cooling circulation unit to provide a low-grade heat source to the evaporator side of the heat pump mechanism, and the cooling circulation unit to output a high-grade heat source through the heating pipeline unit; when the operating mode is a single heating mode, controlling the cooling pipeline unit and the cooling circulation unit to stop working, the cooling circulation unit to provide a low-grade heat source to the evaporator side of the heat pump mechanism, and the cooling circulation unit to provide a low-grade heat source to the evaporator side of the heat pump mechanism ... providing a low-grade heat source to the evaporator side of the heat pump mechanism, and the cooling circulation unit to provide a high-grade heat source to the evaporator side of the heat When the mode is single cooling mode, the heating pipeline unit and the heating circulation unit are controlled to stop working. Low-grade cold source is provided to the condenser side of the heat pump mechanism through the cooling circulation unit, and high-grade cold source is output from the evaporator side of the heat pump mechanism through the cooling pipeline unit. When the working mode is combined cooling and heating mode, the heating circulation unit and the cooling circulation unit are controlled to stop working. Cold water is delivered through the cooperation of the cooling pipeline unit with the evaporator side of the heat pump mechanism, and hot water is delivered through the cooperation of the heating pipeline unit with the condenser side of the heat pump mechanism.

[0017] Beneficial effects: This invention provides a chilled / hot water unit that breaks through the limitations of traditional heat pump units with a single heat source and single function. Through a modular design on both the user side and the heat source side, specifically, by coordinating heating and cooling pipeline units, cooling and cooling circulation units, and heating and cooling pipeline units, it achieves flexible switching between three modes: single heating, single cooling, and combined heating and cooling. This meets the chilled / hot water needs of different scenarios, significantly improving the unit's application range and flexibility. Simultaneously, its multi-functional design can replace the traditional combination of refrigeration and heating units, greatly reducing equipment investment costs. Furthermore, the collaborative design of the dual-function pipelines ensures that the chilled / hot water unit can dynamically adjust its operating mode according to environmental conditions and user needs. This solves the problems of traditional units having a single operating mode and rigid application, while also improving overall energy utilization, reducing operating energy consumption and costs, and enhancing environmental friendliness and application flexibility. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the hot and cold water unit provided by the present invention; Figure 2 A logic flowchart of the control method provided by the present invention; Key component symbols: 11-Condenser, 12-Drier filter, 13-Electronic expansion valve, 14-Evaporator, 15-Compressor, 211-First filter, 212-First check valve, 213-First electric valve, 214-Second electric valve, 215-First water pump, 216-First temperature sensor, 217-Second temperature sensor, 218-First flow protector, 221-Cooling tower, 222-Third electric valve, 223-Fourth electric valve, 311-Fifth electric valve, 312-Sixth electric valve, 3201-Heat source tower, 3202-Expansion tank, 3203-Second check valve, 3 204-Second filter, 3205-Automatic vent valve, 3206-Second water pump, 3207-Seventh electric valve, 3208-Eighth electric valve, 3209-Pressure sensor, 3210-Third temperature sensor, 3211-Fourth temperature sensor, 3212-Fifth temperature sensor, 3213-Second flow protector, 331-Heat source water heat exchanger, 332-Third check valve, 333-Third filter, 334-Third water pump, 335-Eighth electric valve, 336-Ninth electric valve, 41-Fourth check valve, 42-Fourth water pump, 51-First drain valve, 52-Second drain valve. Detailed Implementation

[0019] This invention provides a hot and cold water unit and its control method. To make the purpose, technical solution and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0020] In the description of this invention, it should be understood that the terms "installation" and "connection" should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] Please see Figure 1 This invention provides a hot and cold water unit, including a control device and a heat pump mechanism, a user-side circulation mechanism, and a heat source-side circulation mechanism, all electrically connected to the control device. The user-side circulation mechanism includes a heating pipeline unit and a cooling circulation unit, both electrically connected to the control device. The heat source-side circulation mechanism includes a cooling pipeline unit and a heating circulation unit, both electrically connected to the control device. The heating pipeline unit and the cooling circulation unit are connected to the condenser side of the heat pump mechanism. The cooling pipeline unit and the heating circulation unit are connected to the evaporator side of the heat pump mechanism. The cooling circulation unit cooperates with the cooling pipeline unit to provide cooling. The heating pipeline unit cooperates with the heating circulation unit to provide heating. The heating pipeline unit cooperates with the cooling pipeline unit to provide combined heating and cooling.

[0022] The chiller / hot water unit disclosed in this invention breaks through the limitations of traditional heat pump units with a single heat source and single function. Through modular design on both the user side and the heat source side, specifically, by cooperating heating pipeline units with heating circulation units, cooling pipeline units with cooling circulation units, and cooling pipeline units with heating pipeline units, it achieves flexible switching between three modes: single heating, single cooling, and combined heating and cooling, meeting the chiller / hot water needs in different scenarios and significantly improving the unit's application range and flexibility. At the same time, its multi-functionality can replace the traditional combination of refrigeration and heating units, significantly reducing equipment investment costs. Furthermore, the collaborative design of dual-function pipelines ensures that the chiller / hot water unit can dynamically adjust its operating mode according to environmental conditions and user needs. This not only solves the problems of single operating modes and rigid application of traditional units, but also improves the overall energy utilization rate, reduces operating energy consumption and costs, and enhances environmental friendliness and application flexibility.

[0023] In this embodiment, the chiller unit uses a control device as its core, coordinating the operation of the heat pump mechanism, the user-side circulation mechanism, and the heat source-side circulation mechanism to form a multi-mode adaptable energy supply system. The control device establishes electrical connections with all three mechanisms to achieve command transmission, status feedback, and precise control. The user-side circulation mechanism includes a heating pipeline unit and a cooling circulation unit, both of which are connected to the condenser side of the heat pump mechanism. The heat source-side circulation mechanism includes a cooling pipeline unit and a heating circulation unit, both of which are connected to the evaporator side of the heat pump mechanism. During heating, the heating pipeline unit and the heat source-side circulation unit... In the heat pump system, the heating circulation unit provides a low-grade heat source to the heat pump mechanism. After the heat pump mechanism upgrades the heat source, high-grade hot water is output to the user through the heating pipeline unit. During cooling, the cooling circulation unit and the cooling pipeline unit work together. The cooling circulation unit provides a low-grade cold source to the condenser side of the heat pump mechanism, and the heat pump mechanism outputs high-grade chilled water to the user through the cooling pipeline unit. During combined cooling and heating, the heating pipeline unit and the cooling pipeline unit work directly together. The heat pump mechanism simultaneously achieves the conversion between cooling and heating, outputting hot and cold water to the user through two separate pipelines to meet the simultaneous cooling and heating needs.

[0024] Furthermore, the heat pump mechanism includes a condenser 11, a dryer filter 12, an electronic expansion valve 13, an evaporator 14, and a compressor 15 electrically connected to the control device; the circulation outlet of the compressor 15 is connected to the refrigeration inlet of the condenser 11, and the refrigeration outlet of the condenser 11 is connected to the circulation inlet of the compressor 15 through the dryer filter 12, the electronic expansion valve 13, and the evaporator 14 connected in sequence; the heating pipeline unit and the cooling circulation unit are respectively connected to the condenser 11, and the cooling pipeline unit and the heating circulation unit are respectively connected to the evaporator 14.

[0025] In this embodiment, the heat pump mechanism is the core of energy conversion. The compressor 15 serves as the power source, compressing the low-temperature, low-pressure refrigerant into a high-temperature, high-pressure gas. The refrigerant, discharged from the circulation outlet and sent to the condenser 11, exchanges heat with the circulating water of the use-side circulation mechanism or the cooling medium of the cooling circulation unit in the condenser 11. After releasing heat, it condenses into a high-pressure liquid and flows out from the condenser 11's cooling outlet. It then passes through the dryer filter 12 to remove impurities and moisture, and then passes through the electronic expansion valve 13 to reduce pressure, transforming into a low-temperature, low-pressure gas-liquid mixture. Subsequently, the gas-liquid mixture enters the evaporator 14, absorbing low-grade heat energy delivered by the heat source-side circulation mechanism or releasing heat to the cooling pipeline unit, evaporating into a low-temperature, low-pressure gas, and finally returning to the compressor 15 through the circulation inlet, completing one energy conversion cycle.

[0026] In this embodiment, the closed-loop design of the heat pump mechanism ensures the continuity and stability of the refrigerant circulation, flexibly matching different heat sources and load demands, laying the foundation for improving the overall energy efficiency of the unit. The dryer filter 12 ensures refrigerant cleanliness, preventing component wear or blockage, while the electronic expansion valve 13 precisely controls refrigerant flow and pressure, improving heat exchange efficiency. The coordinated work of the compressor 15 and various heat exchange components achieves efficient conversion between low-grade heat energy and high-grade energy, meeting both heating demands and adapting to cooling and combined cooling and heating conditions, providing core support for multi-mode operation of the unit. Compared to traditional heat pump mechanisms...

[0027] Further, the heating pipeline unit includes a first filter 211, a first check valve 212, and a first electric valve 213, a second electric valve 214, a first water pump 215, a first temperature sensor 216, a second temperature sensor 217, and a first flow protector 218 electrically connected to the control device; the input end of the first electric valve 213 is used to connect to the return water port on the user side, and the output end of the first electric valve 213 is connected to the condensing input side of the heat pump mechanism through the first filter 211, the first water pump 215, and the first check valve 212 connected in sequence; the condensing output side of the heat pump mechanism is connected to the input end of the second electric valve 214 and the input end of the cooling circulation unit, respectively, and the output end of the second electric valve 214 is used to connect to the water supply port on the user side; the first temperature sensor 216 is disposed on the condensing input side of the heat pump mechanism, and the second temperature sensor 217 and the first flow protector 218 are disposed on the condensing output side of the heat pump mechanism.

[0028] In this embodiment, the heating pipeline unit is responsible for the circulation and supply of hot water. Cold water from the user side return port first enters the first electric valve 213, and after being opened by the control device, it flows into the first filter 211 to filter impurities in the water, preventing blockage of subsequent components. The filtered cold water, driven by the first water pump 215, is sent to the condenser input side of the heat pump mechanism through the first check valve 212, where it absorbs the heat released by the refrigerant and heats up. The first temperature sensor 216 is installed on the condenser input side to monitor the inlet water temperature in real time. The heated hot water flows out from the condenser output side, the second temperature sensor 217 monitors the outlet water temperature, and the first flow protector 218 monitors the water flow rate to ensure stable water supply. The hot water is then divided into two paths according to the operating conditions. One path is delivered to the user side supply port through the second electric valve 214 to meet the user's heating needs. The other path is connected to the cooling circulation unit to adapt to the combined cooling and heating operation.

[0029] In this embodiment, the heating pipeline unit, through its integrated design of filtration, pressurization, temperature measurement, and flow restriction, ensures the cleanliness, stability, and accuracy of the hot water supply, extends the service life of the unit components, improves heating reliability and comfort, and provides users with a stable and high-quality hot water supply. It also adapts to combined cooling and heating needs, enhancing the flexibility of the unit's application. The coordinated control of the first electric valve 213 and the second electric valve 214 enables flexible on / off switching of the heating pipeline, adapting to different operating modes. The configuration of dual temperature sensors and a flow protector allows the control device to monitor the water supply status in real time and adjust operating parameters promptly, preventing excessively high temperatures or abnormal flow rates from affecting the user experience.

[0030] Furthermore, the cooling cycle unit includes a cooling tower 221 and a third electric valve 222 and a fourth electric valve 223, which are electrically connected to the control device respectively; the cooling tower 221 is connected to the condenser side of the heat pump mechanism through the third electric valve 222 and the fourth electric valve 223.

[0031] In this embodiment, the cooling cycle unit is an auxiliary component for the refrigeration operation. In the refrigeration mode, the control device opens the third electric valve 222 and the fourth electric valve 223. The high-temperature medium discharged from the condenser side of the heat pump mechanism flows into the cooling tower 221, exchanges heat with the air in the cooling tower 221, releases heat and cools down, and then flows back to the condenser side through the fourth electric valve 223 to form a cooling cycle, providing a low-grade cold source for refrigerant condensation.

[0032] In this embodiment, the cooling cycle unit provides a stable low-grade cold source to the condenser side of the heat pump mechanism through the efficient heat exchange of the cooling tower 221, significantly improving the cooling efficiency and stability. The precise control of the third electric valve 222 and the fourth electric valve 223 enables flexible start and stop of the cooling cycle, adapting to different operating modes and avoiding energy waste under non-cooling conditions. The design of the cooling tower 221 optimizes the heat dissipation effect on the condenser side, reduces the operating load of the compressor 15, and further improves the energy efficiency of the unit.

[0033] Furthermore, the cooling pipeline unit includes a fifth electric valve 311 and a sixth electric valve 312, which are electrically connected to the control device respectively; the heating circulation unit includes a circulating heat source section and a natural heat source section, which are electrically connected to the control device respectively; the circulating heat source section and the natural heat source section are respectively connected to the evaporator side of the heat pump mechanism, and both are used to provide a low-grade heat source to the heat pump mechanism; the evaporator side of the heat pump mechanism is also connected to the fifth electric valve 311 and the sixth electric valve 312 respectively, and the supply and return water circulation of chilled water is realized through the fifth electric valve 311 and the sixth electric valve 312.

[0034] In this embodiment, the cooling pipeline unit consists of a fifth electric valve 311 and a sixth electric valve 312, which are connected to the evaporator side of the heat pump mechanism and are responsible for the supply and return water circulation of chilled water. In the cooling or combined cooling and heating mode, the fifth electric valve 311 and the sixth electric valve 312 are opened, and the chilled water absorbs heat from the evaporator side and cools down. It is then transported to the user terminal for cooling through the fifth electric valve 311, and the return water from the user terminal flows back to the evaporator side through the sixth electric valve 312, completing the cooling cycle. Through the control of the dual electric valves, the efficient circulation of chilled water is achieved, which is suitable for both cooling and combined cooling and heating conditions. The structure is simple and the control is flexible.

[0035] In this embodiment, the heating cycle unit includes a circulating heat source section and a natural heat source section, both of which are connected to the evaporator side of the heat pump mechanism to provide low-grade heat sources. The circulating heat source section generates a stable heat source through internal circulation, while the natural heat source section collects low-grade heat energy from the natural environment. Under the control of the control device, one of them or on demand, the heat source is supplied to the evaporator side to ensure the heating efficiency of the heat pump mechanism. The dual heat source design of the heating cycle unit breaks through the limitations of the single heat source of traditional units. The circulating heat source section ensures a stable supply under normal operating conditions, while the natural heat source section supplements the heat source in extreme environments, ensuring stable heating of the unit throughout the year. The two work together to improve the flexibility of the unit's cooling and heating supply, enhance its adaptability to different environmental conditions, reduce operating energy consumption, and further optimize the overall energy efficiency of the unit.

[0036] Further, the circulating heat source unit includes a heat source tower 3201, an expansion tank 3202, a second check valve 3203, a second filter 3204, an automatic venting valve 3205, and a second water pump 3206, a seventh electric valve 3207, an eighth electric valve 3208, a pressure sensor 3209, a third temperature sensor 3210, a fourth temperature sensor 3211, a fifth temperature sensor 3212, and a second flow protector 3213, all electrically connected to the control device. The evaporation output side of the heat pump mechanism is connected to the seventh electric valve 3207 and the input end of the natural heat source unit, respectively. The output end of the seventh electric valve 3207 is connected to the input end of the heat source tower 3201, and the output end of the heat source tower 3201 is connected to the eighth electric valve 3206 in sequence. Valve 3353208, the second filter 3204, the expansion tank 3202, the automatic venting valve 3205, the second water pump 3206, and the second check valve 3203 are connected to the evaporation input side of the heat pump mechanism; the output end of the natural heat source is connected to the input end of the second filter 3204; the third temperature sensor 3210 is disposed on the evaporation input side of the heat pump mechanism; the fourth temperature sensor 3211 and the second flow protector 3213 are respectively disposed on the evaporation output side of the heat pump mechanism; the pressure sensor 3209 is disposed on the connecting pipe between the automatic venting valve 3205 and the second water pump 3206; and the fifth temperature sensor 3212 is used to obtain the heat source temperature information inside the heat source tower 3201.

[0037] In this embodiment, the circulating heat source section is the core of the heating cycle unit. The refrigerant on the evaporation output side of the heat pump mechanism is divided into two paths. One path flows into the heat source tower 3201 through the seventh electric valve 3207, where it exchanges heat with the air and absorbs heat before flowing out from the output end of the heat source tower 3201. It then passes through the eighth electric valve 335 3208 and the second filter 3204 to filter impurities, and then passes through the expansion tank 3202 to balance the pipeline pressure and the automatic venting valve 3205 to discharge air and prevent air blockage. The treated refrigerant, driven by the second water pump 3206, flows back to the evaporation input side through the second check valve 3203, completing the circulating heat source delivery. The third temperature sensor 3210 monitors the refrigerant temperature on the evaporation input side, the fourth temperature sensor 3211 and the second flow protector 3213 monitor the status of the evaporation output side, the pressure sensor 3209 monitors the pipeline pressure, and the fifth temperature sensor 3212 monitors the heat source temperature inside the heat source tower 3201. All data are fed back to the control device to achieve precise regulation.

[0038] In this embodiment, the circulating heat source unit, through the heat source tower 3201 and the collaborative design of multiple components, achieves stable generation and delivery of low-grade heat source, adapts to the heating requirements of the heat pump mechanism, improves the utilization efficiency and supply stability of the circulating heat source, avoids the impact of pressure fluctuations, impurity blockage and other problems on operation, provides reliable guarantee for the efficient operation of the unit under sufficient circulating heat source conditions, extends the service life of the system, and reduces maintenance costs; the seventh electric valve 3207 and the eighth electric valves 335 and 3208 control the opening and closing of the circulation path, the second filter 3204 ensures the cleanliness of the refrigerant, the expansion tank 3202 and the automatic venting valve 3205 ensure stable pressure of the circulation system and no air blockage, and multiple sets of sensors realize full parameter monitoring.

[0039] Furthermore, the natural heat source section includes a heat source water heat exchanger 331, a third check valve 332, a third filter 333, and a third water pump 334, an eighth electric valve 3353208, and a ninth electric valve 336, all electrically connected to the control device. The input end of the third filter 333 is used to receive natural water, and the output end of the third filter 333 is connected to the water-side inlet of the heat source water heat exchanger 331 via the third water pump 334 and the third check valve 332, which are connected in sequence. The water-side outlet of the heat source water heat exchanger 331 is used to output natural water. The circulation side of the heat source water heat exchanger 331 is connected to the evaporation output side of the heat pump mechanism via the eighth electric valve 3353208, and to the input end of the second filter 3204 via the ninth electric valve 336.

[0040] In this embodiment, the natural heat source section is responsible for collecting low-grade heat energy from the natural environment. Natural water flows in from the input end of the third filter 333. After filtering out impurities and suspended solids, it is sent to the water-side inlet of the heat source water heat exchanger 331 through the third check valve 332 under the drive of the third water pump 334. It exchanges heat with the refrigerant on the circulation side, releases low-grade heat energy, and then flows out from the water-side outlet, returning to the natural environment. The refrigerant flows from the evaporation output side of the heat pump mechanism into the circulation side of the heat source water heat exchanger 331 through the eighth electric valve 335 3208. After absorbing heat from the natural heat source, it flows into the second filter 3204 through the ninth electric valve 336, merges with the refrigerant of the circulating heat source section, and flows back to the evaporation input side, completing the transfer and utilization of the natural heat source.

[0041] In this embodiment, the natural heat source section makes full use of renewable natural heat energy, expanding the heat source channels of the unit. This allows the unit to obtain a stable heat source even when the circulating heat source is insufficient, effectively solving the defect of the traditional unit's single heat source. It enhances the unit's adaptability to extreme environments, improves operational reliability and flexibility, and reduces dependence on traditional energy sources, further improving the unit's energy efficiency and environmental friendliness. The heat source water heat exchanger 331 achieves efficient heat exchange between the natural water source and the refrigerant. The third filter 333 ensures the cleanliness of the natural water source and prevents the heat exchanger from clogging. The third check valve 332 prevents water backflow and ensures smooth circulation.

[0042] Furthermore, the heat source-side circulation mechanism also includes a water replenishment unit, which includes a fourth check valve 41 and a fourth water pump 42 electrically connected to the control device. The input end of the fourth water pump 42 is used to obtain replenishing liquid, and the output end of the fourth water pump 42 is connected to the circulating heat source unit through the fourth check valve 41.

[0043] In this embodiment, the input end of the fourth water pump 42 is connected to the replenishing liquid, and its output end is connected to the pipeline of the circulating heat source through the fourth check valve 41. When the circulating heat source loses refrigerant due to leakage or evaporation, the control device starts the fourth water pump 42 according to the pipeline pressure data fed back by the pressure sensor 3209, pressurizes the replenishing liquid and sends it into the circulation system through the fourth check valve 41 to replenish the total amount of refrigerant and maintain the stability of the system liquid level and pressure.

[0044] In this embodiment, by setting up a water replenishment unit, the problems of pressure instability and heat exchange efficiency reduction caused by refrigerant loss in the circulating heat source section are solved. Through the coordinated control of pressure sensor 3209 and fourth water pump 42, accurate and timely replenishment of liquid is achieved, ensuring that the total amount of refrigerant always meets the operating requirements and maintains the stability of the circulation system. Moreover, the automated water replenishment logic avoids the tediousness and lag of manual water replenishment, reduces operating costs, and protects pipelines and components, avoiding equipment failures caused by low pressure or insufficient refrigerant, thereby improving the reliability and service life of the unit.

[0045] Furthermore, the heat pump mechanism also includes a drainage unit, which includes a first drain valve 51 and a second drain valve 52 that are electrically connected to the control device. The first drain valve 51 is connected to the condenser side of the heat pump mechanism, and the second drain valve 52 is connected to the evaporator side of the heat pump mechanism. Both the first drain valve 51 and the second drain valve 52 are used to discharge wastewater generated during the operation of the hot and cold water unit.

[0046] In this embodiment, the first drain valve 51 is connected to the condenser side of the heat pump mechanism, and the second drain valve 52 is connected to the evaporator side. During unit operation, condensate and cleaning wastewater generated on the condenser side, as well as refrigerant replacement wastewater and cleaning wastewater on the evaporator side, are all discharged through the corresponding drain valves. The control device adjusts the opening and closing of the drain valves according to the operating status or user instructions to ensure timely and orderly discharge of wastewater and prevent accumulation. This prevents component corrosion, scaling, or performance degradation, ensures the cleanliness of the unit's internal components and normal operation, and reduces the risk of failure due to wastewater accumulation. At the same time, it reduces manual operation, improves the convenience of unit operation and maintenance, and enhances environmental friendliness.

[0047] The present invention also provides a control method for a chilled / hot water unit, the control method being implemented based on any of the chilled / hot water units described above, the control method comprising: 101. Obtain the set working mode, which includes single heating mode, single cooling mode and combined heating and cooling mode; In this embodiment, the user can select the working mode set by the operating system. When the user selects the working mode, the control device retrieves the preset parameters in the corresponding mode, including the preset water supply temperature control range, the preset cooling temperature control range, and the preset pipeline pressure control range.

[0048] 102. When the working mode is single heating mode, the cooling pipeline unit and the cooling circulation unit are controlled to stop working, and a low-grade heat source is provided to the evaporation side of the heat pump mechanism through the heating circulation unit, and a high-grade heat source is output from the condensation side of the heat pump mechanism through the heating pipeline unit. In this embodiment, if it is a single heating mode, the control device shuts down the cooling pipeline unit and the cooling circulation unit, and turns on the heating pipeline unit and the heating circulation unit. The heating circulation unit provides a low-grade heat source to the evaporation side of the heat pump mechanism, which then upgrades it to a high-grade heat energy and transfers it to the heating pipeline unit through the condensation side, ultimately outputting hot water to the user.

[0049] 103. When the working mode is single cooling mode, the heating pipeline unit and the heating circulation unit are controlled to stop working, and a low-grade cold source is provided to the condenser side of the heat pump mechanism through the cooling circulation unit, and a high-grade cold source is output from the evaporator side of the heat pump mechanism through the cooling pipeline unit. In this embodiment, if it is a single cooling mode, the control device shuts down the heating pipeline unit and the heating circulation unit, and turns on the cooling circulation unit and the cooling pipeline unit. The cooling circulation unit provides a low-grade cold source to the condenser side, and the heat pump mechanism absorbs heat through the evaporation side, cools the chilled water, and then delivers it to the user through the cooling pipeline unit to achieve cooling.

[0050] 104. When the working mode is the combined heating and cooling mode, the heating circulation unit and the cooling circulation unit are controlled to stop working. Cold water is delivered through the cooling pipeline unit in cooperation with the evaporation side of the heat pump mechanism, and hot water is delivered through the heating pipeline unit in cooperation with the condensation side of the heat pump mechanism. In this embodiment, if it is a combined heating and cooling mode, the control device shuts down the heating circulation unit and the cooling circulation unit, and opens the heating pipeline unit and the cooling pipeline unit. The heat pump mechanism simultaneously realizes the refrigerant condensation and heat release and evaporation and heat absorption, respectively outputting hot water through the heating pipeline unit and cold water through the cooling pipeline unit to meet the user's simultaneous heating and cooling needs.

[0051] The control method disclosed in this application enables flexible switching between three operating modes, allowing one unit to perform multiple functions instead of two traditional units, significantly reducing equipment investment and installation space. The automation and smoothness of mode switching reduce the difficulty of manual operation and avoid the risk of misoperation. Precise parameter control in different modes ensures that the supply of hot and cold water meets user needs, while improving the overall energy utilization rate and reducing operating energy consumption. It solves the problems of single function and rigid application of traditional units, and enhances the adaptability and practicality of the units.

[0052] Furthermore, in this embodiment of the invention, the control method further includes: 201. When the heating mode is executed, the real-time ambient temperature is obtained, and the preset ambient temperature control range is obtained. The ambient temperature control range includes the upper limit value of the ambient temperature and the lower limit value of the ambient temperature. In this embodiment, the upper limit of ambient temperature and the lower limit of ambient temperature are preset values ​​based on the operating conditions adapted to the unit and the characteristics of the circulating heat source and the natural heat source, in order to ensure the timeliness and rationality of heat source switching.

[0053] 202. When the lower limit of the ambient temperature is less than or equal to the real-time ambient temperature, the circulating heat source unit and the natural heat source unit are controlled to maintain their current operating state. 203. When the real-time ambient temperature is greater than the upper limit of the ambient temperature, the natural heat source unit is controlled to stop working, and low-grade heat source is provided to the heat pump mechanism only through the circulating heat source unit; 204. When the real-time ambient temperature is less than the lower limit of the ambient temperature, the circulating heat source unit is controlled to stop working, and low-grade heat source is provided to the heat pump mechanism only through the natural heat source unit; In this embodiment, when the real-time ambient temperature is between the lower and upper limits of the ambient temperature, it indicates that both the circulating heat source unit and the natural heat source unit can stably provide low-grade heat under the current environmental conditions. The control device maintains the current operating state of both units without switching. When the real-time ambient temperature is higher than the upper limit of the ambient temperature, the circulating water heat source temperature is more suitable for the heat pump operation under summer conditions and the supply is sufficient. At this time, the control device issues a command to shut down the relevant components of the natural heat source unit, stop the operation of the natural heat source unit, and only keep the circulating heat source unit running. The circulating heat source unit provides low-grade heat to the heat pump mechanism to optimize the energy efficiency ratio and reduce operating energy consumption. When the real-time ambient temperature is lower than the lower limit of the ambient temperature, the natural water heat source is more suitable for the heat pump operation under winter conditions and the supply is sufficient. The control device issues a command to shut down the relevant components of the circulating heat source unit, stop the operation of the circulating heat source unit, and only start the natural heat source unit to provide low-grade heat to the heat pump mechanism, ensuring the stable satisfaction of heating or domestic water demand.

[0054] In this embodiment, intelligent automatic switching of the heat source is realized. It can dynamically select the optimal heat source unit according to changes in ambient temperature, ensuring that the unit can obtain efficient low-grade heat sources in different seasons and environmental conditions, thereby ensuring that the unit always maintains a high operating energy efficiency ratio. In summer, sufficient circulating water heat source is used, and in winter, stable natural heat source is used, avoiding the problem of insufficient supply or low efficiency of a single heat source in extreme environments, significantly improving the unit's operational flexibility and adaptability. At the same time, intelligent switching reduces manual intervention, lowers the difficulty of operation and operating costs, and reduces the operating energy consumption of the heat pump unit by optimizing the selection of heat source, further enhancing the energy-saving effect and environmental friendliness.

[0055] Furthermore, in this embodiment of the invention, the control method further includes: 301. Obtain the real-time heating temperature fed back by the second temperature sensor 217, and obtain the preset heating temperature control range, wherein the heating temperature control range includes an upper limit value for the heating temperature and a lower limit value for the heating temperature. In this embodiment, the cooling temperature setting is typically set to 7-12℃, and the control accuracy is set to ±1-2℃, which can be adjusted according to user needs.

[0056] 302. When the lower limit of the heating temperature is less than or equal to the real-time heating temperature and less than or equal to the upper limit of the heating temperature, the heat pump mechanism is controlled to maintain its current operating state. 303. When the real-time heating temperature is greater than the upper limit of the heating temperature, control the heat pump mechanism to reduce the heating capacity; 304. When the real-time heating temperature is less than the lower limit of the heating temperature, the heat pump mechanism is controlled to increase the heating capacity; In this embodiment, when the real-time heating temperature is between the lower and upper limits of the heating temperature, it indicates that the current heating temperature meets the user's needs. The control device maintains the current operating state of the heat pump mechanism and maintains the existing heating capacity. When the real-time heating temperature is higher than the upper limit of the heating temperature, it indicates that the heating capacity is excessive. The control device issues a command to adjust the operating parameters of the heat pump mechanism. Specifically, by controlling the compressor 15 to unload, the operating frequency or output power of the compressor 15 is reduced, thereby reducing the heating capacity of the heat pump mechanism and causing the heating temperature to gradually fall back to the set range. When the real-time heating temperature is lower than the lower limit of the heating temperature, it indicates that the heating capacity is insufficient. The control device issues a command to adjust the operating parameters of the heat pump mechanism. Specifically, by controlling the compressor 15 to load, the operating frequency or output power of the compressor 15 is increased, thereby increasing the heating capacity of the heat pump mechanism and causing the heating temperature to gradually rise to the set range.

[0057] 305. Obtain the real-time cooling temperature fed back by the fourth temperature sensor 3211, and obtain the preset cooling temperature control range, wherein the cooling temperature control range includes the upper limit value of the cooling temperature and the lower limit value of the cooling temperature. In this embodiment, the cooling temperature setting is typically set to 40-55℃, and the control accuracy is set to ±1-2℃, which can be adjusted according to user needs.

[0058] 306. When the lower limit of the cooling temperature is less than or equal to the real-time cooling temperature and less than or equal to the upper limit of the cooling temperature, the heat pump mechanism is controlled to maintain its current operating state. 307. When the real-time cooling temperature is greater than the upper limit of the cooling temperature, control the heat pump mechanism to increase the cooling capacity; 308. When the real-time cooling temperature is less than the lower limit of the cooling temperature, the heat pump mechanism is controlled to reduce the cooling capacity; In this embodiment, when the real-time cooling temperature is between the lower and upper limits of the cooling temperature, it indicates that the current cooling temperature meets the user's needs. The control device maintains the current operating state of the heat pump mechanism and maintains the existing heating capacity. When the real-time cooling temperature is higher than the upper limit of the cooling temperature, it indicates that the cooling capacity is insufficient. The control device issues a command to adjust the operating parameters of the heat pump mechanism. Specifically, by controlling the compressor 15 to load, the operating frequency or output power of the compressor 15 is increased, thereby increasing the cooling capacity of the heat pump mechanism and gradually lowering the cooling temperature back to the set range. When the real-time cooling temperature is lower than the lower limit of the cooling temperature, it indicates that the cooling capacity is excessive. The control device issues a command to adjust the operating parameters of the heat pump mechanism. Specifically, by controlling the compressor 15 to unload, the operating frequency or output power of the compressor 15 is reduced, thereby reducing the cooling capacity of the heat pump mechanism and gradually raising the cooling temperature to the set range.

[0059] In this embodiment, by adjusting the working state of the heat pump mechanism based on the real-time heating temperature, precise control of the cooling / heating temperature is achieved, ensuring that the output hot and cold water temperatures remain stable within the user's demand range, thus improving user comfort. By dynamically adjusting the load of the compressor 15, energy waste is avoided, while protecting the core components of the compressor 15 and extending its service life. The rapid response of the temperature control enables the unit to adapt to changes in user load in a timely manner, maintaining operational stability and efficiency, and further optimizing the overall energy efficiency of the unit.

[0060] Furthermore, in this embodiment of the invention, the control method further includes: 401. When the heating mode is executed, the real-time pipeline pressure fed back by the pressure sensor 3209 is obtained, and the preset pipeline pressure control range is obtained. The pipeline pressure control range includes the upper limit value of the pipeline pressure and the lower limit value of the pipeline pressure. In this embodiment, the upper limit and lower limit of the pipeline pressure are preset values ​​based on the safe operating pressure of the circulation system, the component withstand pressure, and the circulation flow requirements. Typically, the upper limit of the pipeline pressure is set to 80%-90% of the maximum withstand pressure of the component, and the lower limit is set to the minimum pressure required to ensure normal circulation flow.

[0061] 402. When the lower limit of the pipeline pressure is less than or equal to the real-time pipeline pressure and the upper limit of the pipeline pressure, the water replenishment unit is controlled to maintain its current working state. 403. When the real-time pipeline pressure is greater than the upper limit of the pipeline pressure, control the water replenishment unit to reduce the amount of liquid replenished; 404. When the real-time pipeline pressure is less than the lower limit of the pipeline pressure, control the water replenishment unit to increase the amount of replenished liquid; In this embodiment, when the real-time pipeline pressure is between the lower and upper limits of the pipeline pressure, it indicates that the circulation system pressure is stable and meets the operating requirements. The control device maintains the current operating state of the water replenishment unit unchanged, and there is no need to adjust the amount of replenished liquid. When the real-time pipeline pressure is higher than the upper limit of the pipeline pressure, it indicates that the system pressure is too high, which may lead to pipeline leakage or component damage. The control device issues a command to adjust the operating parameters of the water replenishment unit. Specifically, by controlling the fourth water pump 42 to unload, reduce the pump operating frequency or stop the pump, so as to reduce the input of replenished liquid and gradually reduce the pipeline pressure to the set range. When the real-time pipeline pressure is lower than the lower limit of the pipeline pressure, it indicates that the system pressure is too low, which may lead to insufficient circulation flow and affect heat exchange efficiency. The control device issues a command to adjust the operating parameters of the water replenishment unit. Specifically, by controlling the fourth water pump 42 to load, increase the pump operating frequency or start the pump, so as to increase the input of replenished liquid and gradually increase the pipeline pressure to the set range.

[0062] In this embodiment, by adjusting the water supply of the water supply unit based on real-time pipeline pressure, stable control of the circulating system pipeline pressure is achieved, avoiding the adverse effects of excessively high or low pressure on unit operation. Stable pressure ensures the circulation flow of the circulating heat source unit, guaranteeing efficient delivery of low-grade heat to the heat pump mechanism and maintaining the unit's heat exchange efficiency and operational stability. Simultaneously, it avoids pipeline leaks and component damage caused by excessive pressure, and prevents problems such as poor circulation and decreased heat exchange efficiency caused by excessively low pressure, significantly improving the unit's operational reliability and safety. Furthermore, precise control of the replenished liquid volume avoids waste, reduces operating costs, extends the service life of pipelines and related components, and further enhances the unit's overall performance.

[0063] It is understood that those skilled in the art can make equivalent substitutions or changes to the technical solution and inventive concept of the present invention, and all such changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A hot and cold water unit, characterized in that, The system includes a control device and a heat pump mechanism, a user-side circulation mechanism, and a heat source-side circulation mechanism, all electrically connected to the control device. The user-side circulation mechanism includes a heating pipeline unit and a cooling circulation unit, both electrically connected to the control device. The heat source-side circulation mechanism includes a cooling pipeline unit and a heating circulation unit, both electrically connected to the control device. The heating pipeline unit and the cooling circulation unit are connected to the condenser side of the heat pump mechanism. The cooling pipeline unit and the heating circulation unit are connected to the evaporator side of the heat pump mechanism. The cooling circulation unit cooperates with the cooling pipeline unit to provide cooling. The heating pipeline unit cooperates with the heating circulation unit to provide heating. The heating pipeline unit cooperates with the cooling pipeline unit to provide combined cooling and heating.

2. A hot and cold water unit according to claim 1, characterized in that, The heat pump mechanism includes a condenser, a dryer filter, an electronic expansion valve, an evaporator, and a compressor electrically connected to the control device; the circulation outlet of the compressor is connected to the refrigeration inlet of the condenser, and the refrigeration outlet of the condenser is connected to the circulation inlet of the compressor through the dryer filter, the electronic expansion valve, and the evaporator connected in sequence; the heating pipeline unit and the cooling circulation unit are respectively connected to the condenser, and the cooling pipeline unit and the heating circulation unit are respectively connected to the evaporator.

3. A hot and cold water unit according to claim 1, characterized in that, The heating pipeline unit includes a first filter, a first check valve, and a first electric valve, a second electric valve, a first water pump, a first temperature sensor, a second temperature sensor, and a first flow protector, all electrically connected to the control device. The input end of the first electric valve is connected to the return water port on the user side, and the output end of the first electric valve is connected to the condensing input side of the heat pump mechanism via the first filter, the first water pump, and the first check valve connected in sequence. The condensing output side of the heat pump mechanism is connected to the input end of the second electric valve and the input end of the cooling circulation unit, respectively, and the output end of the second electric valve is connected to the water supply port on the user side. The first temperature sensor is located on the condensing input side of the heat pump mechanism, and the second temperature sensor and the first flow protector are located on the condensing output side of the heat pump mechanism.

4. A hot and cold water unit according to claim 3, characterized in that, The cooling cycle unit includes a cooling tower and a third electric valve and a fourth electric valve, which are electrically connected to the control device respectively; the cooling tower is connected to the condenser side of the heat pump mechanism through the third electric valve and the fourth electric valve.

5. A hot and cold water unit according to claim 1, characterized in that, The cooling pipeline unit includes a fifth electric valve and a sixth electric valve, which are electrically connected to the control device respectively; the heating circulation unit includes a circulating heat source section and a natural heat source section, which are electrically connected to the control device respectively; the circulating heat source section and the natural heat source section are respectively connected to the evaporator side of the heat pump mechanism, and both are used to provide a low-grade heat source to the heat pump mechanism; the evaporator side of the heat pump mechanism is also connected to the fifth electric valve and the sixth electric valve respectively, and the supply and return water circulation of chilled water is realized through the fifth electric valve and the sixth electric valve.

6. A hot and cold water unit according to claim 5, characterized in that, The circulating heat source unit includes a heat source tower, an expansion tank, a second check valve, a second filter, an automatic venting valve, and a second water pump, a seventh electric valve, an eighth electric valve, a pressure sensor, a third temperature sensor, a fourth temperature sensor, a fifth temperature sensor, and a second flow protector, all electrically connected to the control device. The evaporation output side of the heat pump mechanism is connected to the seventh electric valve and the input end of the natural heat source unit. The output end of the seventh electric valve is connected to the input end of the heat source tower. The output end of the heat source tower is connected to the evaporation input side of the heat pump mechanism via the eighth electric valve, the second filter, the expansion tank, the automatic venting valve, the second water pump, and the second check valve, which are connected in sequence. The output end of the natural heat source unit is connected to the input end of the second filter. The third temperature sensor is located on the evaporation input side of the heat pump mechanism. The fourth temperature sensor and the second flow protector are located on the evaporation output side of the heat pump mechanism. The pressure sensor is located on the connecting pipe between the automatic venting valve and the second water pump. The fifth temperature sensor is used to acquire the heat source temperature information inside the heat source tower.

7. A hot and cold water unit according to claim 6, characterized in that, The natural heat source section includes a heat source water heat exchanger, a third check valve, a third filter, and a third water pump, an eighth electric valve, and a ninth electric valve, all electrically connected to the control device. The input end of the third filter is used to receive natural water, and the output end of the third filter is connected to the water-side inlet of the heat source water heat exchanger via the third water pump and the third check valve, which are connected in sequence. The water-side outlet of the heat source water heat exchanger is used to output natural water. The circulation side of the heat source water heat exchanger is connected to the evaporation output side of the heat pump mechanism via the eighth electric valve, and to the input end of the second filter via the ninth electric valve.

8. A hot and cold water unit according to claim 6, characterized in that, The heat source-side circulation mechanism also includes a water replenishment unit, which includes a fourth check valve and a fourth water pump electrically connected to the control device. The input end of the fourth water pump is used to obtain replenishing liquid, and the output end of the fourth water pump is connected to the circulating heat source section through the fourth check valve.

9. A hot and cold water unit according to claim 1, characterized in that, The heat pump mechanism further includes a drainage unit, which includes a first drain valve and a second drain valve that are electrically connected to the control device. The first drain valve is connected to the condenser side of the heat pump mechanism, and the second drain valve is connected to the evaporator side of the heat pump mechanism. Both the first drain valve and the second drain valve are used to discharge wastewater generated during the operation of the hot and cold water unit.

10. A control method for a hot and cold water unit, characterized in that, The control method is implemented based on the chiller unit as described in any one of claims 1-9, and the control method includes: Obtain the set working mode, which includes single heating mode, single cooling mode and combined heating and cooling mode; When the working mode is single heating mode, the cooling pipeline unit and the cooling circulation unit are controlled to stop working, and a low-grade heat source is provided to the evaporation side of the heat pump mechanism through the heating circulation unit, and a high-grade heat source is output from the condensation side of the heat pump mechanism through the heating pipeline unit. When the working mode is single cooling mode, the heating pipeline unit and the heating circulation unit are controlled to stop working, and a low-grade cold source is provided to the condenser side of the heat pump mechanism through the cooling circulation unit, and a high-grade cold source is output from the evaporator side of the heat pump mechanism through the cooling pipeline unit. When the working mode is combined heating and cooling mode, the heating circulation unit and the cooling circulation unit are controlled to stop working. Cold water is delivered through the cooling pipeline unit in cooperation with the evaporation side of the heat pump mechanism, and hot water is delivered through the heating pipeline unit in cooperation with the condensation side of the heat pump mechanism.

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