Air source heat pump system and control method for rapid refrigeration and heating thereof

Abstract

The application provides an air source heat pump system and a control method for rapid refrigeration and heating of the system. The system comprises: a heat pump unit; a water-using device; a water outlet pipeline connected between a water outlet of the heat pump unit and a water inlet side of the water-using device; a buffer water tank; a first water return pipeline connected between a water outlet side of the water-using device and a water return inlet of the buffer water tank; and a second water return pipeline connected between a water return outlet of the buffer water tank and a water inlet of the heat pump unit. The system further comprises: a first water quantity adjusting assembly for adjusting the water quantity of the water return at the water outlet side of the water-using device which directly enters the water inlet without passing through the buffer water tank. By arranging the first water quantity adjusting assembly, the water quantity of the water return at the water outlet side of the water-using device which directly enters the water inlet of the heat pump unit without passing through the buffer water tank is adjusted, the working load of the heat pump unit is reduced, and rapid refrigeration or heating is achieved.

Description

Technical Field

[0001] This invention relates to the field of air source heat pump systems, specifically to an air source heat pump system and its control method for rapid cooling and heating. Background Technology

[0002] Existing air source heat pump systems typically include a buffer tank between the heat pump unit and the water-using equipment to store a certain amount of water. This helps address temperature fluctuations and frequent starts of the heat pump unit when the system load is low. Storing water also prevents water shortages, ensures stable water pressure, and meets defrosting requirements.

[0003] However, the buffer tank also means that when there is a need for cooling or heating, the water in the entire system (including the water in the buffer tank) often needs to be cooled or heated first before the target temperature of the water-using equipment can be obtained for cooling or heating. This cannot meet the urgent needs for rapid cooling and heating. Summary of the Invention

[0004] To address the above problems, this invention provides an air source heat pump system and its control method for rapid cooling and heating. By setting a first water flow regulating component, the amount of return water from the outlet side of the water-using equipment is adjusted so that it enters the inlet of the heat pump unit directly without passing through a buffer water tank. This allows at least a portion of the return water to enter the heat pump unit directly without passing through a buffer water tank, reducing the workload of the heat pump unit and achieving rapid cooling or heating.

[0005] This invention provides an air source heat pump system, comprising: a heat pump unit; a water-using device; an outlet pipe connected between the outlet of the heat pump unit and the inlet of the water-using device; a buffer tank; a first return water pipe connected between the outlet of the water-using device and the return water inlet of the buffer tank; a second return water pipe connected between the return water outlet of the buffer tank and the inlet of the heat pump unit; and further comprising: a first water flow regulating component disposed on the first and second return water pipes, the first water flow regulating component being used to regulate the amount of return water from the outlet of the water-using device that enters the inlet directly without passing through the buffer tank.

[0006] According to the technical solution, during normal operation, the return water from the outlet side of the water-using equipment enters the inlet of the heat pump unit after passing through the buffer water tank. By setting a first water volume regulating component, the amount of return water from the outlet side of the water-using equipment that enters the inlet of the heat pump unit directly without passing through the buffer water tank is adjusted, so that part or all of the return water from the outlet side of the water-using equipment enters the inlet of the heat pump unit directly without passing through the buffer water tank.

[0007] Specifically, when all return water enters the heat pump unit directly without passing through the buffer tank, the heat pump unit only needs to cool or heat the water circulating in the air source heat pump system (without needing to cool or heat the water stored in the buffer tank), which greatly reduces the load on the heat pump unit and improves the cooling or heating speed.

[0008] In cooling mode, some of the return water from the outlet side of the water-using equipment enters the heat pump unit through a buffer tank, while some enters the heat pump unit directly. The return water entering the heat pump unit is a mixture of the two parts. Therefore, the outlet water temperature of the water-using equipment is lower than the mixed water temperature, which is lower than the tank water temperature. Compared to water from the buffer tank entering the heat pump unit directly, the lower-temperature mixed water entering the heat pump unit can reduce the outlet water temperature of the heat pump unit, thus improving the cooling speed. Furthermore, when the return water from the outlet side of the water-using equipment enters the buffer tank, it can lower the tank temperature, allowing the tank temperature to drop to the target temperature more quickly, achieving rapid cooling.

[0009] In heating mode, some return water enters the heat pump unit through a buffer tank, while some enters directly into the heat pump unit. The return water entering the heat pump unit is a mixture of the two parts. The outlet water temperature of the water-using equipment is greater than the mixed water temperature, which is greater than the water temperature in the water tank. Compared to water in the buffer tank entering the heat pump unit directly, the higher temperature mixed water entering the heat pump unit can increase the outlet water temperature of the heat pump unit, thus improving the heating speed. Furthermore, when the return water from the outlet side of the water-using equipment enters the buffer tank, it can increase the tank temperature, allowing the tank temperature to rise to the target temperature more quickly, achieving rapid heating.

[0010] In an optional technical solution of the present invention, the device further includes: a temperature detection element for detecting the actual outlet water temperature of the heat pump unit; a controller for setting the target temperature of the heat pump unit; and, based on the difference between the target temperature and the actual outlet water temperature, controlling the amount of return water from the outlet side of the water-using equipment to directly enter the inlet of the heat pump unit without passing through the buffer tank.

[0011] According to this technical solution, the amount of return water that enters the heat pump unit's inlet directly without passing through the buffer tank is controlled based on the difference between the target temperature and the actual outlet water temperature. This allows for precise control of the actual outlet water temperature of the heat pump unit, improving the accuracy of temperature control and ensuring that the air source heat pump system can quickly heat or cool under optimal parameter conditions.

[0012] In an optional technical solution of the present invention, the water volume regulating component includes a first three-way proportional valve, a second three-way proportional valve, and a bypass pipeline. The two ports of the first three-way proportional valve are directly connected to the first return water pipeline, the two ports of the second three-way proportional valve are directly connected to the second return water pipeline, and the two ends of the bypass pipeline are connected to one port of the first three-way proportional valve and one port of the second three-way proportional valve, respectively.

[0013] According to this technical solution, the water volume regulating component can conveniently regulate the return water volume entering the heat pump unit from the outlet side of the water-using equipment. The water volume regulating component has a simple structure, is easy to obtain, and has low cost, which helps to reduce manufacturing costs.

[0014] In an optional technical solution of the present invention, the controller is configured to perform: a judgment step: judging the range of the difference; and a control step: controlling and adjusting the opening ratio of the first three-way proportional valve and the second three-way proportional valve according to the judgment result of the judgment step and the operating mode of the heat pump unit.

[0015] According to this technical solution, depending on the operating mode and the range of the difference between the target temperature and the actual outlet water temperature, the first three-way proportional valve and the second three-way proportional valve can perform different opening ratios, which is beneficial to improving the accuracy of rapid cooling or heating.

[0016] In the optional technical solution of the present invention, in the cooling or heating mode, the absolute value of the difference increases, and the amount of return water from the outlet side of the water-using equipment directly enters the inlet of the heat pump unit without passing through the buffer water tank increases.

[0017] According to this technical solution, when the target temperature is significantly different from the actual outlet water temperature, the amount of return water on the outlet side that enters the heat pump unit directly without passing through the buffer tank is increased. This increases the amount of return water circulating in the heat pump air conditioning system, thereby improving the cooling or heating speed of this part of the circulating return water. Furthermore, the fact that some of the return water enters the buffer tank increases the rate at which the water temperature in the buffer tank rises or falls, which is beneficial for achieving rapid heating or cooling.

[0018] In the optional technical solutions of the present invention, the water-using equipment is a fan coil unit and / or underfloor heating.

[0019] According to this technical solution, the water-using equipment can be one or more of the following: fan coil unit, underfloor heating system, or other equipment with cooling or heating requirements.

[0020] In the optional technical solution of the present invention, the buffer water tank further includes an inlet and an outlet, the inlet being connected to the outlet of the heat pump unit and the outlet being connected to the inlet side of the water-using equipment; the air source heat pump system further includes: a second water volume regulating component, used to regulate the amount of water from the outlet of the heat pump unit that enters the inlet side of the water-using equipment directly without passing through the buffer water tank.

[0021] According to this technical solution, in heating mode, the water from the buffer tank outlet mixes with the water from the heat pump unit outlet before entering the inlet side of the water-using equipment. The water temperature at the heat pump unit outlet is higher than the mixed water temperature, which is higher than the tank temperature. Compared to using the water in the buffer tank directly on the water-using equipment, the mixed water has a higher temperature, which helps to improve the heating speed. Furthermore, some of the return water from the water-using equipment, after heat exchange, enters the buffer tank, further increasing the water temperature within the buffer tank. By installing water flow regulating components in both the outlet and return water pipes, the overall cooling and heating speed of the air source heat pump system is improved.

[0022] The present invention also provides a control method for rapid cooling and heating of an air source heat pump system. The air source heat pump system includes: a heat pump unit; water-using equipment; an outlet pipe connected between the outlet of the heat pump unit and the inlet of the water-using equipment; a buffer tank; a first return pipe connected between the outlet of the water-using equipment and the return inlet of the buffer tank; and a second return pipe connected between the return outlet of the buffer tank and the inlet of the heat pump unit. The control method includes the following steps: at least some of the return water from the outlet of the water-using equipment enters the inlet of the heat pump unit directly without passing through the buffer tank.

[0023] In an optional technical solution of the present invention, the method further includes: detecting the actual outlet water temperature of the heat pump unit; setting the target temperature of the heat pump unit; and controlling the amount of return water from the outlet side of the water-using equipment to directly enter the heat pump unit without passing through the buffer tank, based on the difference between the target temperature and the actual outlet water temperature.

[0024] In the optional technical solution of the present invention, in the cooling or heating mode, the absolute value of the difference increases, thereby controlling the amount of water that the return water on the outlet side of the water-using equipment enters the inlet of the heat pump unit directly without passing through the buffer water tank. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the air source heat pump system in the first embodiment of the present invention.

[0026] Figure 2 This is a schematic flowchart illustrating the control method for rapid cooling and heating of an air source heat pump system according to an embodiment of the present invention.

[0027] Figure 3 This is a schematic diagram of the air source heat pump system in the second embodiment of the present invention.

[0028] Figure label:

[0029] Heat pump unit 1; outlet 11; inlet 12; water-using equipment 2; inlet side 21; outlet side 22; buffer water tank 3; return water inlet 31; return water outlet 32; liquid inlet 33; liquid outlet 34; first return water pipeline 41; second return water pipeline 42; first water flow regulating component 5; first three-way proportional valve 51; second three-way proportional valve 52; bypass pipeline 53; outlet pipeline 6; water pump 61; second water flow regulating component 7. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] [First Implementation Method]

[0032] This invention provides an air source heat pump system, comprising: a heat pump unit 1; a water-using device 2; a water outlet pipe 6 connected between the water outlet 11 of the heat pump unit 1 and the water inlet 21 of the water-using device 2, wherein a water pump 61 is provided on the water outlet pipe 6 to provide power for circulating the water from the outlet of the heat pump unit 1 in the pipe; a buffer water tank 3; a first return water pipe 41 connected between the water outlet 22 of the water-using device 2 and the return water inlet 31 of the buffer water tank 3; a second return water pipe 42 connected between the return water outlet 32 ​​of the buffer water tank 3 and the water inlet 12 of the heat pump unit 1; and further comprising: a first water volume regulating component 5 disposed on the first return water pipe 41 and the second return water pipe 42, wherein the first water volume regulating component is used to regulate the amount of return water from the water outlet 22 that enters the water inlet 12 of the heat pump unit 1 directly without passing through the buffer water tank 3. The heat pump unit 1 includes a refrigerant circuit composed of components such as a compressor, a four-way valve, a condenser, an evaporator, and a throttling valve. The water outlet pipe 6, the water return pipe (including the first water return pipe 41 and the second water return pipe 42), and the pipes located inside the heat pump unit 1 that exchange heat with the condenser or evaporator form a water circulation pipe.

[0033] During normal operation, the return water from the outlet side 22 enters the inlet 12 of the heat pump unit 1 after passing through the buffer water tank 3. By setting the first water volume adjustment component, the water volume of the return water from the outlet side 22 is adjusted so that it does not pass through the buffer water tank 3 and directly enters the inlet 12 of the heat pump unit 1. This allows part or all of the return water from the outlet side 22 to enter the inlet 12 of the heat pump unit 1 directly without passing through the buffer water tank 3, which can adjust the temperature of the return water entering the heat pump unit 1 and is beneficial to accelerate heating or heating.

[0034] Specifically, when all the return water enters the heat pump unit 1 directly without passing through the buffer tank 3, the heat pump unit 1 only needs to cool or heat the water circulating in the air source heat pump system (only the water in the water circulation pipeline needs to be cooled or heated, and the water stored in the buffer tank 3 does not enter the water circulation pipeline to participate in cooling or heating), and the water temperature on the outlet side is the return water temperature of the heat pump unit 1 (this return water temperature is higher than the water tank temperature when heating and lower than the water tank temperature when cooling), which greatly reduces the load on the heat pump unit 1 and improves the cooling or heating speed.

[0035] In cooling mode, part of the return water from the outlet side 22 enters the heat pump unit 1 through the buffer tank 3, and part enters the heat pump unit 1 directly. The return water entering the heat pump unit 1 is a mixture of the two parts. Therefore, the water temperature at the outlet side 22 is lower than the temperature of the mixed water, which is lower than the water temperature in the buffer tank. Compared to water in the buffer tank 3 entering the heat pump unit 1 directly, the lower temperature of the mixed water entering the heat pump unit 1 can reduce the outlet water temperature of the heat pump unit 1, thus improving the cooling speed. Furthermore, when the return water from the outlet side 22 enters the buffer tank 3, it can lower the tank temperature, allowing the tank temperature to drop to the target temperature (the target outlet water temperature of the heat pump unit 1) more quickly, achieving rapid cooling.

[0036] In heating mode, some of the return water enters heat pump unit 1 through buffer tank 3, while some enters directly into heat pump unit 1. The return water entering heat pump unit 1 is a mixture of two parts, with the outlet water temperature 22 > the mixed water temperature > the tank water temperature. Compared to water from buffer tank 3 entering heat pump unit 1 directly, the higher-temperature mixed water entering heat pump unit 1 increases the outlet water temperature, thus improving the heating speed. Furthermore, when the return water from outlet tank 22 enters buffer tank 3, it raises the tank temperature, allowing the tank temperature to rise to the target temperature more quickly, achieving rapid heating.

[0037] In a preferred embodiment of the present invention, the device further includes: a temperature detection element (not shown in the figure) for detecting the actual outlet water temperature of the heat pump unit 1; and a controller (not shown in the figure) for setting a target temperature for the heat pump unit 1 and controlling the amount of return water from the outlet side 22 to directly enter the inlet 12 of the heat pump unit 1 without passing through the buffer tank 3, based on the difference between the target temperature and the actual outlet water temperature. Controlling the amount of return water to directly enter the inlet 12 of the heat pump unit 1 without passing through the buffer tank 3, based on the difference between the target temperature and the actual outlet water temperature, enables precise control of the actual outlet water temperature of the heat pump unit 1, improves the accuracy of temperature control, and ensures that the air source heat pump system can quickly heat or cool under optimal parameter conditions.

[0038] In a preferred embodiment of the present invention, the water flow regulating component 5 includes a first three-way proportional valve 51, a second three-way proportional valve 52, and a bypass pipe 53. The two ports (X and Z ports) of the first three-way proportional valve 51 are directly connected to the first return water pipe 41; the two ports (X and Z ports) of the second three-way proportional valve 52 are directly connected to the second return water pipe 42; and the two ends of the bypass pipe 53 are respectively connected to one port (Y port) of the first three-way proportional valve 51 and one port (Y port) of the second three-way proportional valve 52. This water flow regulating component allows for convenient adjustment of the return water volume entering the inlet 12 of the heat pump unit 1 from the outlet 22 of the water-using equipment. The water flow regulating component has a simple structure, is readily available, and has low cost, which helps reduce manufacturing costs. Furthermore, the structure of the two three-way proportional valves is a common application form in the art, and the water flow rate entering different flow paths can be adjusted by adjusting the opening degree, which will not be elaborated further here. It should be noted that the flow regulation component 5 is not limited to the structure of the three-way proportional valve and bypass pipe 53 exemplified in this embodiment. Other flow regulation structures that can realize the return water on the outlet side being diverted directly or indirectly back to the heat pump unit 1 without affecting the water flow out of the outlet side 21 and the water flow in the inlet 12 are also applicable to this embodiment.

[0039] In a preferred embodiment of the present invention, the controller is configured to perform: a judgment step: judging the range of the difference; and a control step: according to the judgment result of the judgment step and the operating mode of the heat pump unit 1, controlling and adjusting the opening ratio of the first three-way proportional valve 51 and the second three-way proportional valve 52.

[0040] Through the above method, the opening ratios of the first three-way proportional valve 51 and the second three-way proportional valve 52 are different, resulting in different return water volumes from the water side 21 to the buffer tank 3 before entering the heat pump unit 1 and directly to the heat pump unit 1. Depending on the operating mode and the range of the difference between the target temperature and the actual outlet water temperature, the first three-way proportional valve 51 and the second three-way proportional valve 52 execute different opening ratios, which helps improve the accuracy of rapid cooling or heating. Preferably, the opening ratios of the first three-way proportional valve 51 and the second three-way proportional valve 52 are the same, simplifying the control procedure and improving control efficiency.

[0041] In a preferred embodiment of the present invention, in cooling or heating mode, as the absolute value of the difference increases, the amount of return water from the outlet side 22 that directly enters the inlet 12 of the heat pump unit 1 without passing through the buffer water tank 3 increases. When the target temperature is significantly different from the actual outlet temperature, increasing the amount of return water from the outlet side 22 that directly enters the inlet 12 of the heat pump unit 1 without passing through the buffer water tank 3 increases the amount of return water circulating in the heat pump air conditioning system, thereby improving the cooling or heating speed of this circulating return water. Furthermore, the fact that some return water enters the buffer water tank 3 increases the rate at which the water temperature in the buffer water tank 3 rises or falls, which is beneficial for achieving rapid heating or cooling.

[0042] Specifically, such as Figure 1 , Figure 2 As shown, the two three-way proportional valves are controlled synchronously, and the X ports of the three-way proportional valves are always connected to the outlet side 22 and the inlet 12 of the heat pump unit 1, respectively. Part of the return water from the outlet side 22 enters the heat pump unit 1, and part enters the buffer tank 3. The two three-way proportional valves are used to adjust the proportion of return water from the outlet side 22 entering the heat pump unit 1 and the buffer tank 3, respectively. Therefore, the sum of the opening ratio of the XY flow path formed by the X and Y ports and the opening ratio of the XZ flow path formed by the X and Z ports is 100%. For example, if the XZ flow path is 55% open, then the XY flow path is 45% (1-45%); if the XZ flow path is 100% open, then the XY flow path is 0%. The control signals of the two three-way proportional valves can be connected to the same control interface of the controller for synchronous control.

[0043] like Figure 2 As shown, based on the operating mode of heat pump unit 1 and the range of the difference between the target temperature and the actual temperature, controlling the first three-way proportional valve 51 and the second three-way proportional valve 52 to execute different opening ratios includes:

[0044] Preset parameters: a > b > c > d; e > f > g > h; 100 > u > v > w > 0. The temperature difference range between the actual outlet water temperature and the target temperature or the temperature difference range between the target temperature and the actual outlet water temperature can be adjusted according to the actual system. The number of intervals in the temperature difference range can also be adjusted. This implementation method does not limit this.

[0045] (1) During the start-up / running phase of the compressor (not shown in the figure) of the heat pump unit 1, in the cooling mode, when the target temperature TS ≤ the actual outlet water temperature Tout-e, the actual outlet water temperature is much higher than the target temperature. In order to achieve the purpose of rapid cooling (mainly referring to the rapid cooling or heating of the water in the water-using equipment 2), it is necessary to completely shield the buffer water tank 3 (the return water from the outlet side 22 does not pass through the buffer water tank 3) so that the water circulation does not pass through the buffer water tank 3 (the water in the buffer water tank 3 does not participate in the heat exchange with the heat pump unit 1). At this time, adjust the three-way proportional valve Y = 100% and Z = 0%, that is, the XY flow path is open and the XZ flow path is closed. At this time, the circulating water volume (mainly referring to the water volume that participates in the heat exchange with the heat pump unit 1) is very small, which can quickly reduce the circulating water temperature, thereby achieving rapid cooling of the water-using equipment 2.

[0046] (2) During the start-up / operation phase, in cooling mode, when the target temperature Tout-e < TS ≤ Tout-f, f ≤ actual outlet water temperature - target temperature < e, the actual outlet water temperature begins to approach the target temperature, indicating that the system can meet part of the cooling demand and achieve the purpose of rapid cooling. It can also circulate the water in the buffer tank 3 in an appropriate amount, so that the water in the buffer tank 3 also begins to cool down. At this time, adjust the three-way proportional valve Y = u%, Z = (100-u)%, that is, the proportion of the XY flow path is u%, and the proportion of the XZ flow path is (100-u)%, so that the water in the buffer tank 3 participates in the water circulation in an appropriate amount (that is, participates in the heat exchange with the heat pump unit 1 to achieve cooling), so that the water in the buffer tank 3 also begins to cool down. Although the circulating water volume begins to increase, it can still significantly cool down the circulating water after heat exchange with the heat pump unit 1. This achieves rapid cooling of the water-using equipment 2 while gradually reducing the water temperature of the buffer tank 3, thus achieving the goal of simultaneously reducing the water temperature of the circulating water and the buffer tank 3 in the air source heat pump system to the target temperature during the cooling period.

[0047] (3) During the start-up / operation phase, in cooling mode, when the target temperature Tout-f < TS ≤ Tout-g, and g ≤ actual outlet water temperature - target temperature < f, the actual outlet water temperature is already closer to the target temperature than in (3), indicating that it can meet some cooling demand and achieve the purpose of rapid cooling. It can also circulate water in the buffer tank 3 in an appropriate amount, so that the water in the buffer tank 3 also begins to cool down. At this time, adjust the three-way proportional valve Y = v%, Z = (100-v)%, that is, the proportion of the XY flow path is v%, and the proportion of the XZ flow path is (100-v)%. This can allow the water in the buffer tank 3 to participate in the water circulation in an appropriate amount (that is, participate in heat exchange with the heat pump unit 1 to achieve cooling). Although the circulating water volume begins to increase further, it can still significantly cool the circulating water after heat exchange with the heat pump unit 1, thereby achieving rapid cooling of the water-using equipment 2 while slowly reducing the water temperature of the buffer tank 3, thus achieving the purpose of simultaneously reducing the circulating water and buffer tank 3 water temperature in the air source heat pump system to the target temperature during the cooling period.

[0048] (4) During the start-up / operation phase, in cooling mode, when the target temperature Tout-g < TS ≤ Tout-h, h ≤ actual outlet water temperature - target temperature < g, the actual outlet water temperature is already closer to the target temperature than in step 5, indicating that it can meet part of the cooling demand and achieve the purpose of rapid cooling. It can also circulate a suitable amount of water in the buffer tank 3, causing the water in the buffer tank 3 to begin cooling down. At this time, adjust the three-way proportional valve Y = w%, Z = (100-w)%, that is, the proportion of the XY flow path is w%, and the proportion of the XZ flow path is (100-w)%; so that a suitable amount of water in the buffer tank 3 participates in the water circulation (i.e., participates in heat exchange with the heat pump unit 1 to achieve cooling). Although the circulating water volume is further increased, after heat exchange with the heat pump unit 1, it can still significantly cool the circulating water, thereby achieving rapid cooling of the water-using equipment 2 while also gradually reducing the water temperature of the buffer tank 3, thus achieving the purpose of simultaneously reducing the circulating water and buffer tank 3 water temperatures to the target temperature during the cooling period.

[0049] (5) During the startup / operation phase, in cooling mode, when the target temperature Tout-h < TS, the actual outlet water temperature - target temperature < h. At this point, the actual outlet water temperature is very close to the target temperature, indicating that it can meet all cooling needs and achieve the purpose of rapid cooling. Furthermore, it allows all the water in buffer tank 3 to participate in the water circulation, causing the water in buffer tank 3 to cool down to the target temperature. At this time, adjust the three-way proportional valve Y = 0% and Z = 100%, that is, the proportion of the XY flow path open is 0%, and the proportion of the XZ flow path open is 100%.

[0050] (6) During the start-up / operation phase, in heating mode, when the target temperature TS≥Tout+a, the actual outlet water temperature is much lower than the target temperature. In order to achieve rapid heating, it is necessary to completely shield the buffer water tank 3 so that the water circulation does not pass through the buffer water tank 3. At this time, adjust the three-way proportional valve Y=100% and Z=0%, that is, the XY flow path is open and the XZ flow path is closed. At this time, the circulating water volume is very small, which can quickly raise the circulating water temperature, thereby achieving rapid heating of the water-using equipment 2.

[0051] (7) During the start-up / operation phase, in heating mode, when the target temperature Tout+b<TS≤Tout+a, b<target temperature-actual outlet water temperature≤a, the temperature difference is less than a, and the actual outlet water temperature has begun to approach the target temperature. At this time, the heating demand can be met to achieve the purpose of rapid heating, and the water in the buffer tank 3 can be circulated in an appropriate amount to make the water in the buffer tank 3 also start to heat up. At this time, adjust the three-way proportional valve Y=u%, Z=(100-u)%, that is, the proportion of the XY flow path is u%, and the proportion of the XZ flow path is (100-u)%, so that a small amount of water in the buffer tank 3 participates in the water circulation, and the water in the buffer tank 3 also starts to heat up. At this time, although the circulating water volume begins to increase, after heat exchange with the heat pump unit 1, it can still significantly heat up the circulating water, which can increase the circulating water temperature to achieve rapid heating at the terminal. At the same time, it also slowly raises the water temperature of the buffer tank 3, so as to realize the simultaneous raising of the circulating water and buffer tank 3 water temperature in the air source heat pump system to the target temperature during the heating period.

[0052] (8) During the start-up / operation phase, in heating mode, when the target temperature Tout+c<TS≤Tout+b, c<target temperature-actual outlet water temperature≤b, the actual outlet water temperature is closer to the target temperature than in step 9, indicating that it can meet some of the heating demand and achieve the purpose of rapid heating. It can also circulate a suitable amount of water in the buffer tank 3, so that the water in the buffer tank 3 also begins to heat up. At this time, adjust the three-way proportional valve Y=v%, Z=(100-v)%, that is, the proportion of the XY flow path is v%, and the proportion of the XZ flow path is (100-v)%, so that a suitable amount of water in the buffer tank 3 participates in the water circulation, and the water in the buffer tank 3 also begins to heat up. At this time, although the circulating water volume begins to increase, it can still significantly heat up the circulating water after heat exchange with the heat pump unit 1, which can increase the circulating water temperature and thus achieve rapid heating at the terminal. At the same time, it also slowly raises the water temperature of the buffer tank 3, so as to realize that the circulating water and the water temperature of the buffer tank 3 in the air source heat pump system are simultaneously raised to the target temperature during the heating period.

[0053] (9) During the start-up / operation phase, in heating mode, when the target temperature Tout+d<TS≤Tout+c, d<target temperature-actual outlet water temperature≤c, the actual outlet water temperature is closer to the target temperature than in step 10, indicating that it can meet most of the heating needs and achieve the purpose of rapid heating. It can also circulate the water in the buffer tank 3 in an appropriate amount to raise the water temperature in the buffer tank 3. At this time, adjust the three-way proportional valve Y=w%, Z=(100-w)%, that is, the proportion of the XY flow path is w%, and the proportion of the XZ flow path is (100-w)%. This allows the water in the buffer tank 3 to participate in the water circulation, and the water in the buffer tank 3 also begins to heat up. At this time, although the circulating water volume begins to increase, it can still significantly raise the temperature of the circulating water after heat exchange with the heat pump unit 1, thereby increasing the circulating water temperature to achieve rapid heating at the terminal. At the same time, it also slowly raises the water temperature of the buffer tank 3, thereby achieving the simultaneous raising of the circulating water and buffer tank 3 water temperature in the air source heat pump system to the target temperature during the heating period.

[0054] (10) During the start-up / operation phase, in heating mode, when the target temperature TS≤Tout+d, the target temperature - actual outlet water temperature ≤d. At this time, the actual outlet water temperature is very close to the target temperature, indicating that it can meet all heating requirements and achieve the purpose of rapid heating. It can also completely circulate the water in the buffer tank 3 so that the water in the buffer tank 3 can be heated to the target temperature. At this time, adjust the three-way proportional valve Y=0% and Z=100%, that is, the proportion of the XY flow path is 0% and the proportion of the XZ flow path is 100%. All the water in the buffer tank 3 participates in the circulation.

[0055] In a preferred embodiment of the present invention, the water-using device 2 is a fan coil unit and / or underfloor heating. The water-using device 2 can be one or more of a fan coil unit and underfloor heating, or other devices with cooling or heating requirements.

[0056] The present invention also provides a control method for rapid cooling and heating of the above-mentioned air source heat pump system, including the following steps: at least part of the return water from the outlet side 22 is allowed to enter the inlet 12 of the heat pump unit 1 directly without passing through the buffer water tank 3.

[0057] In a preferred embodiment of the present invention, the method further includes: detecting the actual outlet water temperature of the heat pump unit 1; setting the target temperature of the heat pump unit 1; and controlling the amount of return water from the outlet side 22 that does not pass through the buffer tank 3 and directly enters the heat pump unit 1 based on the difference between the target temperature and the actual outlet water temperature.

[0058] In a preferred embodiment of the present invention, in cooling or heating mode, the absolute value of the difference increases, thereby controlling the amount of return water from the outlet side 22 to directly enter the inlet 12 of the heat pump unit 1 without passing through the buffer tank 3.

[0059] In some implementations, the control method further includes a judgment step: determining the range of the difference; and a control step: based on the judgment result and the operating mode of the heat pump unit, controlling and adjusting the opening ratio of the first three-way proportional valve 51 and the second three-way proportional valve 52. Specific adjustment methods can be found in [reference needed]. Figure 2 This will not be elaborated upon here.

[0060] [Second Implementation Method]

[0061] like Figure 3 As shown, the second embodiment of the present invention provides an air source heat pump system, which is basically the same in structure as the first embodiment, except that the buffer water tank 3 further includes an inlet 33 and an outlet 34. The inlet 33 is connected to the outlet 11 of the heat pump unit 1, and the outlet 34 is connected to the inlet side 21. The air source heat pump system also includes a second water volume regulating component 6, which is used to regulate the amount of water from the outlet 11 of the heat pump unit 1 that enters the inlet side 21 directly without passing through the buffer water tank 3.

[0062] Specifically, in heating mode, the water from the outlet of buffer tank 3 mixes with the water from the outlet of heat pump unit 1 before entering the inlet side 21. The water temperature at the outlet of heat pump unit 1 is higher than the mixed water temperature, which is higher than the tank temperature. Compared to using the water in buffer tank 3 directly for the water-using device 2, the mixed water has a higher temperature, which helps to improve the heating speed. Furthermore, some of the return water from the heat exchanger with the water-using device 2, after its temperature rises, enters buffer tank 3, further increasing the water temperature within buffer tank 3. In cooling mode, the water from the outlet of buffer tank 3 mixes with the water from the outlet of heat pump unit 1 before entering the inlet side 21. The water temperature at the outlet of heat pump unit 1 is lower than the mixed water temperature, which is lower than the tank temperature. Compared to using the water in buffer tank 3 directly for the water-using device 2, the mixed water has a lower temperature, which helps to improve the cooling speed. Furthermore, some of the return water from the heat exchanger with the water-using device 2, after its temperature decreases, enters buffer tank 3, further reducing the water temperature within buffer tank 3. By installing water flow regulating components in the outlet pipe 6 and return pipe respectively, the overall cooling and heating speed of the air source heat pump system can be improved.

[0063] Corresponding to the air source heat pump structure of the second embodiment, this embodiment further provides a control method for rapid cooling and heating, including: adjusting the amount of water from the outlet of the heat pump unit that enters the inlet side 21 directly without passing through the buffer water tank. The method of adjusting the amount of water entering the inlet side directly without passing through the buffer water tank 3 is similar to... Figure 2 The principle is similar, so it will not be repeated here.

[0064] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An air source heat pump system, comprising: Heat pump units; Water-using equipment; The water outlet pipe is connected between the water outlet of the heat pump unit and the water inlet side of the water-using equipment. Buffer water tank; The first return water pipeline is connected between the outlet side of the water-using equipment and the return water inlet of the buffer water tank; The second return water pipeline connects the return water outlet of the buffer water tank to the inlet of the heat pump unit; characterized in that it further includes: A first water volume regulating component is provided in the first return water pipeline and the second return water pipeline. The first water volume regulating component is used to regulate the amount of return water from the outlet side of the water-using equipment that enters the inlet directly without passing through the buffer water tank.

2. The air source heat pump system according to claim 1, characterized in that, Also includes: A temperature sensing element is used to detect the actual outlet water temperature of the heat pump unit; The controller is used to set the target temperature of the heat pump unit and, based on the difference between the target temperature and the actual outlet water temperature, control the amount of return water from the outlet side of the water-using equipment to directly enter the inlet of the heat pump unit without passing through the buffer water tank.

3. The air source heat pump system according to claim 2, characterized in that, The water volume regulating component includes a first three-way proportional valve, a second three-way proportional valve, and a bypass pipeline, wherein... The two ports of the first three-way proportional valve are directly connected to the first return water pipeline; The two ports of the second three-way proportional valve are directly connected to the second return water pipeline; The two ends of the bypass pipeline are respectively connected to one port of the first three-way proportional valve and one port of the second three-way proportional valve.

4. The air source heat pump system according to claim 3, characterized in that, The controller is configured to execute: Judgment steps: Determine the range of the difference; Control steps: Based on the judgment result of the judgment step and the operating mode of the heat pump unit, control and adjust the opening ratio of the first three-way proportional valve and the second three-way proportional valve.

5. The air source heat pump system according to claim 4, characterized in that, In cooling or heating mode, the absolute value of the difference increases, and the amount of return water from the outlet side of the water-using equipment that enters the inlet of the heat pump unit directly without passing through the buffer water tank increases.

6. The air source heat pump system according to any one of claims 1 to 5, characterized in that, The water-using equipment is a fan coil unit and / or underfloor heating.

7. The air source heat pump system according to any one of claims 1 to 5, characterized in that, The buffer tank also includes an inlet and an outlet. The inlet is connected to the outlet of the heat pump unit, and the outlet is connected to the inlet side of the water-using equipment. The air source heat pump system also includes: The second water volume regulating component is used to regulate the amount of water from the outlet of the heat pump unit that enters the water inlet side of the water-using equipment directly without passing through the buffer water tank.

8. A control method for rapid cooling and heating of an air source heat pump system, characterized in that, The air source heat pump system includes: Heat pump units; Water-using equipment; The water outlet pipe is connected between the water outlet of the heat pump unit and the water inlet side of the water-using equipment. Buffer water tank; The first return water pipeline is connected between the outlet side of the water-using equipment and the return water inlet of the buffer water tank; The second return water pipeline connects the return water outlet of the buffer water tank to the inlet of the heat pump unit; the control method includes the following steps: This ensures that at least some of the return water from the outlet side of the water-using equipment enters the inlet directly without passing through the buffer tank.

9. The control method for rapid cooling and heating of an air source heat pump system according to claim 8, characterized in that, Also includes: The actual outlet water temperature of the heat pump unit was detected; Set the target temperature of the heat pump unit; Based on the difference between the target temperature and the actual outlet water temperature, the amount of return water from the outlet side of the water-using equipment is controlled so that it enters the heat pump unit directly without passing through the buffer water tank.

10. The control method for rapid cooling and heating of an air source heat pump system according to claim 9, characterized in that, In cooling or heating mode, the absolute value of the difference increases, thereby controlling the increase of the amount of return water from the outlet side of the water-using equipment to directly enter the inlet of the heat pump unit without passing through the buffer water tank.

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