Circulating air energy water heating device

Abstract

The application provides a circulating air energy water heating device, which comprises a heat preservation water tank, a first section of pipeline, a first-stage air energy heating increasing assembly, a second section of pipeline, a second-stage air energy heating increasing assembly and a third section of pipeline which are connected in sequence. A circulating pump is further connected in series on the first section of pipeline. A proportional integral regulating valve is connected on the part of the first section of pipeline between the circulating pump and the heat preservation water tank. The circulating pump is used for conveying water at a first temperature along the first section of pipeline to the first-stage air energy heating increasing assembly, the first-stage air energy heating increasing assembly is used for heating the water to a second temperature, the water at the second temperature is conveyed to the second-stage air energy heating increasing assembly through the second section of pipeline, the second-stage air energy heating increasing assembly is used for heating the water to a third temperature, and the water at the third temperature is conveyed to the heat preservation water tank through the third section of pipeline. The application improves the heating efficiency by heating the water twice, and the load of each heating assembly is not too high, and the operation is not prone to failure.

Description

Technical Field

[0001] This application belongs to the field of air source heat pump water circulation technology, and particularly relates to a circulating air source heat pump water heater. Background Technology

[0002] Existing hot water preparation systems mostly employ single-stage air-source heat pumps or other single-stage heating equipment to heat cold water to a set temperature in a single operation and then store it in an insulated water tank. While this type of structure can meet daily hot water supply needs, in actual operation, due to limitations in single-stage heating power and heat transfer efficiency, the water temperature rises slowly. Under low ambient temperatures or high water flow conditions, the heating efficiency drops significantly, resulting in low overall system energy efficiency. Furthermore, the heating process places a heavy load on the heat pump unit, which is not conducive to long-term stable operation.

[0003] It should be noted that the above content is not necessarily prior art, nor is it intended to limit the scope of patent protection of this application. Utility Model Content

[0004] This application provides a circulating air source heat pump water heater to solve or alleviate one or more technical problems in the prior art.

[0005] This application provides a circulating air source heat pump water heater, including:

[0006] The first-stage air source heat pump assembly includes a first water inlet and a first water outlet.

[0007] The second-stage air source heat pump adds components, including a second water inlet and a second water outlet;

[0008] The insulated water tank includes a third inlet and a third outlet.

[0009] The first section of the pipeline connects the third water outlet and the first water inlet.

[0010] The second section of pipeline connects the first water outlet and the second water inlet.

[0011] The third section of the pipeline connects the second outlet and the third inlet.

[0012] A circulating pump is connected in series in the first section of the pipeline;

[0013] A proportional-integral regulating valve is connected to a portion of the first section of pipeline between the circulating pump and the insulated water tank, and is used to replenish water to the insulated water tank;

[0014] The circulating pump is used to transport water at a first temperature along the first section of the pipeline to the first-stage air-source heat pump assembly. The first-stage air-source heat pump assembly is used to heat the water at the first temperature to a second temperature and transport the water at the second temperature through the second section of the pipeline to the second-stage air-source heat pump assembly. The second-stage air-source heat pump assembly is used to heat the water at the second temperature to a third temperature and transport the water at the third temperature through the third section of the pipeline to the insulated water tank.

[0015] Optionally, it also includes a water level detection component, which is disposed on the insulated water tank and used to detect the water level in the insulated water tank;

[0016] The proportional-integral regulating valve opens and closes based on the water level in the insulated water tank.

[0017] Optionally, it also includes a water temperature detection component, which is installed on the insulated water tank and is used to detect the temperature of the water in the insulated water tank and the temperature of the water in the third section of the pipeline;

[0018] The proportional-integral regulating valve is also opened and closed based on the water level in the insulated water tank and the water temperature in the third section of the pipeline.

[0019] Optionally, it also includes a hot water supply pump connected to the insulated water tank for supplying water from the insulated water tank to external equipment.

[0020] Optionally, the first-stage air source heating enhancement component includes:

[0021] The first compressor is used to compress the refrigerant into a high-temperature, high-pressure gas;

[0022] The first condenser has its inlet end connected to the outlet end of the first compressor and is used to allow water at the first temperature to pass through and heat it to the second temperature.

[0023] The first expansion valve has its inlet end connected to the outlet end of the first condenser.

[0024] The first evaporator has its inlet end connected to the outlet end of the first expansion valve, and its outlet end connected to the inlet end of the first compressor.

[0025] Optionally, the first end of the first section of the pipeline is connected to the first condenser, and the first end of the second section of the pipeline is connected to the condenser, so that water at the first temperature is heated to the second temperature after passing through the first condenser and then enters the second section of the pipeline.

[0026] Optionally, the second-stage air-source heat pump heating enhancement component includes:

[0027] The second compressor is used to compress the refrigerant into a high-temperature, high-pressure gas;

[0028] The second condenser has its inlet end connected to the outlet end of the second compressor and is used to supply water at the second temperature and heat it to the second temperature.

[0029] The second expansion valve has its inlet end connected to the outlet end of the second condenser.

[0030] The second evaporator has its inlet end connected to the outlet end of the second expansion valve, and its outlet end connected to the inlet end of the second compressor.

[0031] Optionally, the second end of the second section of the pipeline is connected to the second condenser, and the first end of the third section of the pipeline is connected to the second condenser, so that water at the second temperature is heated to the third temperature after passing through the second condenser and enters the third section of the pipeline.

[0032] The embodiments of this application employing the above-described technical solution may have the following advantages:

[0033] The circulating pump is used to transport water at a first temperature along the first section of the pipeline to the first-stage air source heat pump assembly. The first-stage air source heat pump assembly is used to heat the water at the first temperature to a second temperature and then transport the water at the second temperature through the second section of the pipeline to the second-stage air source heat pump assembly. The second-stage air source heat pump assembly is used to heat the water at the second temperature to a third temperature and then transport the water at the third temperature through the third section of the pipeline to the insulated water tank. In this embodiment, the circulating air source water heater heats the water sequentially through two air source heat pump assemblies connected in series, which improves the water heating efficiency. Moreover, the load on each of the two air source heat pump assemblies is not too high, and they can operate for a long time without easily failing.

[0034] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0035] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0036] Figure 1 This is a schematic diagram of the structure of a circulating air source heat pump water heater provided in an embodiment of this application;

[0037] Figure 2 A diagram is attached to the comparison table and calculation table for savings.

[0038] Figure 3 This is a graph of experimental test data;

[0039] Figure 4 This is a graph of test data from another experiment.

[0040] Explanation of reference numerals in the attached figures:

[0041] First-stage air source heat pump assembly 10; Second-stage air source heat pump assembly 20; First compressor 11; First condenser 13; First expansion valve 15; First evaporator 17; Second compressor 21; Second condenser 23; Second expansion valve 25; Second evaporator 27; Insulated water tank 30; First section pipeline 41; Second section pipeline 42; Third section pipeline 43; Circulation pump 50; Proportional-integral regulating valve 60; Water temperature detection assembly 71; Water level detection assembly 72; Hot water supply pump 80; Return water electric valve 90. Detailed Implementation

[0042] The embodiments of this application are described in detail below, examples of which are illustrated in the accompanying drawings. In the drawings, for clarity, the dimensions of layers, regions, elements, and their relative dimensions may be exaggerated. The same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0043] It should be understood that when an element or layer is referred to as "on," "adjacent to," "connected to," or "coupled to" other elements or layers, it may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. Conversely, when an element is referred to as "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc., may be used to describe various elements, components, areas, layers, and / or portions, these elements, components, areas, layers, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, area, layer, or portion from another element, component, area, layer, or portion. Therefore, without departing from the teachings of this application, the first element, component, area, layer, or portion discussed below may be referred to as a second element, component, area, layer, or portion. And the discussion of a second element, component, area, layer, or portion does not imply that the first element, component, area, layer, or portion necessarily exists in this application.

[0044] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0046] In this application, when numerical intervals (i.e., numerical ranges) are involved, unless otherwise specified, the distribution of selectable numerical values ​​within the numerical interval is considered continuous, and includes the two endpoints of the numerical interval (i.e., the minimum and maximum values), as well as every numerical value between these two endpoints. Unless otherwise specified, when a numerical interval refers only to integers within that numerical interval, it includes the two endpoint integers of the numerical range, as well as every integer between the two endpoints, which is equivalent to directly listing every integer. When multiple numerical ranges are provided to describe features or characteristics, these numerical ranges can be merged. In other words, unless otherwise specified, the numerical ranges disclosed in this application should be understood to include any and all subranges included therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, percentage, ratio, etc. The term "numerical interval" can be broadly included to include percentage intervals, ratio intervals, proportion intervals, etc.

[0047] This application provides a circulating air-source heat pump water heater. Based on this, the heating efficiency of hot water is improved, and the operating load of the heating components is reduced. See below for details.

[0048] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. It should be understood that these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein.

[0049] Please see Figure 1 This application provides a circulating air source heat pump water heater, which includes a first-stage air source heating element 10, a second-stage air source heating element 20, an insulated water tank 30, a first section of pipeline 41, a second section of pipeline 42, a third section of pipeline 43, a circulating pump 50, and a proportional-integral regulating valve 60. The following is a detailed description:

[0050] The first-stage air-source heat pump heating element 10 includes a first water inlet and a first water outlet. The first water inlet is the water inlet of the element, used to receive lower-temperature water from the circulation system; the first water outlet is the outlet of the heated water, used to deliver the water to the next element.

[0051] The second-stage air source heat pump booster 20 includes a second water inlet and a second water outlet. The second-stage air source heat pump booster 20 has a similar structure to the first component and is used to further heat the water. The second water inlet receives water output from the first-stage air source heat pump booster 10, at which point the water has reached an intermediate temperature. The second water outlet outputs the heated water to meet the system's final temperature requirement for hot water.

[0052] The insulated water tank 30 includes a third inlet and a third outlet. The insulated water tank 30 is used to store and keep heated water warm, reducing heat loss.

[0053] The first section of pipe 41 connects the third water outlet and the first water inlet. The first section of pipe 41 is a water supply path from the water outlet of the insulated water tank 30 to the inlet of the first-stage air source heat pump assembly 10. Its function is to send the return water (at a lower temperature) in the water tank into the first-stage air source heat pump assembly 10 for reheating.

[0054] The second section of pipe 42 connects the first water outlet and the second water inlet. The second section of pipe 42 transports the water heated by the first-stage air source heat pump assembly 10 to the second-stage air source heat pump assembly 20 for secondary heating.

[0055] The third section of pipe 43 connects the second water outlet and the third water inlet. The third section of pipe 43 is used to input the water heated by the second-stage air-source heat pump assembly 20 into the insulated water tank 30 to complete one water heating cycle.

[0056] A circulation pump 50 is connected in series with the first section of pipe 41. The circulation pump 50 serves as the power core for water circulation, used to transport water at a first temperature along the first section of pipe to the first-stage air-source heat pump amplification component, and also used to drive the water to be heated to flow between the first-stage air-source heat pump amplification component 10, the second-stage air-source heat pump amplification component 20, the insulated water tank 30, the first section of pipe 41, the second section of pipe 42, and the third section of pipe 43.

[0057] The proportional-integral (PI) regulating valve 60 is connected to the first section of pipeline 41 between the circulating pump 50 and the insulated water tank 30, and is used to replenish water to the insulated water tank 30. The PI regulating valve 60 can adjust its opening degree according to signals such as water temperature and water level in the tank, achieving precise water replenishment. It employs a combination of proportional (P) and integral (I) control algorithms, enabling both rapid response and avoiding frequent fluctuations, ensuring the water tank operates within a suitable water temperature and level range.

[0058] In this embodiment, the circulating pump 50 is used to transport water at a first temperature along the first section of pipeline 41 to the first-stage air source heat pump booster 10. The first-stage air source heat pump booster 10 is used to heat the water at the first temperature to a second temperature, and then transport the water at the second temperature through the second section of pipeline 42 to the second-stage air source heat pump booster 20. The second-stage air source heat pump booster 20 is used to heat the water at the second temperature to a third temperature, and then transport the water at the third temperature through the third section of pipeline 43 to the insulated water tank 30. The circulating air source water heater of this embodiment heats the water sequentially through two air source heat pump boosters connected in series, which improves the water heating efficiency. Moreover, the load on each of the two air source heat pump boosters is not too high, and they can operate for a long time without easily failing.

[0059] As exemplarily illustrated, in this embodiment, the proportional-integral regulating valve 60 inputs water at a first temperature (45°C) from an external water storage device into the first section of pipeline 41. The circulating pump 50 then drives the water at the first temperature (45°C) into the first-stage air-source heat pump amplification component 10. After passing through the first-stage air-source heat pump amplification component 10, the water at the first temperature (45°C) is heated to a second temperature (50°C) and enters the second-stage air-source heat pump amplification component 20 along the second section of pipeline 42. The water at the second temperature (50°C) is then heated to a third temperature (55°C) after passing through the second-stage air-source heat pump amplification component 20 and enters the insulated water tank 30 along the third section of pipeline 43, thus completing one water circulation heating cycle. It is understood that the first temperature, second temperature, and third temperature can also be other temperatures or temperature ranges; the above values ​​are merely illustrative and not intended to be limiting.

[0060] Furthermore, in this embodiment, the circulating air source heat pump water heater also includes a water temperature detection component 71, which is disposed on the insulated water tank 30 and used to detect the water temperature in the insulated water tank 30 and the water temperature in the third section pipeline. The proportional-integral regulating valve 60 is also opened and closed based on the water level in the insulated water tank 30 and the water temperature in the third section pipeline. Specifically, the water temperature detection component 71 can be a temperature sensor (such as a thermistor, platinum resistance thermometer, or digital temperature probe), installed in the upper middle or lower middle part of the insulated water tank 30 to obtain representative water temperature data.

[0061] Based on this, the opening and closing logic of the proportional-integral regulating valve 60 and the circulating pump 50 can be as follows: when the water temperature is lower than the first water temperature threshold (e.g., 45°C), the proportional-integral regulating valve 60 and the circulating pump 50 automatically start, delivering low-temperature water to the first-stage air source heat pump booster component 10 for heating and circulation. When the water temperature reaches or exceeds the second water temperature threshold (e.g., 55°C), the proportional-integral regulating valve 60 and the circulating pump 50 close, stopping the heating circulation to avoid overheating and energy waste. Through the above-described circulating pump 50 control method based on water temperature detection, this embodiment can effectively reduce the operating frequency of the air source heat pump system, extend the service life of the equipment, and achieve energy-saving operation while ensuring the stability of the hot water supply at the user end.

[0062] Furthermore, in this embodiment, the circulating air source heat pump water heater also includes a water level detection component 72, which is disposed on the insulated water tank 30 and used to detect the water level in the insulated water tank 30. The proportional-integral regulating valve 60 is also opened and closed based on the water level in the insulated water tank 30.

[0063] Specifically, the water level detection component 72 can be a float level sensor, a pressure level sensor, or an electrode level detector, and can be installed on the side wall or bottom of the insulated water tank 30 to obtain the water level information in the insulated water tank 30 in real time. Preferably, the float level sensor can directly float up and down with the water level and trigger a switch signal, while the pressure level sensor indirectly reflects the water level by detecting changes in water pressure.

[0064] Based on this, the control logic of the proportional-integral (PI) regulating valve 60 can simultaneously combine water level and water temperature signals for judgment: when the water level in the insulated water tank 30 is detected to be lower than the first water level height (e.g., 30% of the capacity) or the water temperature is detected to be lower than the first water temperature threshold (e.g., 45℃), the PI regulating valve 60 and the circulation pump 50 are activated in coordination to deliver low-temperature water to the first-stage air-source heat pump booster component 10 for heating and circulation. When the water level in the insulated water tank 30 is detected to reach the second water level height (e.g., 90% of the capacity) or the water temperature reaches or exceeds the second water temperature threshold (e.g., 55℃), the PI regulating valve 60 and the circulation pump 50 are automatically shut off to stop water replenishment and heating circulation, thus avoiding overflow and energy waste.

[0065] By using the above-mentioned proportional-integral regulating valve 60 based on the linkage of water level and water temperature, this embodiment can ensure a sufficient supply of hot water in the water tank while preventing abnormal system operation caused by excessively high or low water levels, thereby improving the safety and stability of operation.

[0066] In an optional embodiment, the circulating air source heat pump water heater of this embodiment further includes a hot water supply pump 80, which is connected to the insulated water tank 30 and is used to input the water in the insulated water tank 30 to an external device.

[0067] Specifically, the hot water supply pump 80 can be a centrifugal pump, a stainless steel multistage pump, or a variable frequency booster pump. Its inlet end is connected to the insulated water tank 30, and its outlet end is connected to external water-using equipment through a water supply pipeline, such as showers, washbasins, kitchen water outlets, radiators, or underfloor heating systems in residential or commercial buildings.

[0068] In an optional embodiment, the first-stage air-source heat pump enhancement component 10 specifically includes:

[0069] The first compressor 11 is used to compress the refrigerant into a high-temperature, high-pressure gas. Preferably, the first compressor 11 can be a fully enclosed scroll compressor or a fully enclosed reciprocating compressor, and its input end is connected to the first evaporator 17. It is used to perform adiabatic compression on the low-temperature, low-pressure gaseous refrigerant, thereby raising the temperature of the refrigerant and providing sufficient heat energy for subsequent condensation and heat exchange.

[0070] The first condenser 13 has its inlet end connected to the outlet end of the first compressor 11, and is used to supply water at the first temperature and heat it to the second temperature. Specifically, the first condenser 13 can adopt a shell-and-tube, plate, or tube-type heat exchange structure, with refrigerant and water flow channels inside, and heat exchange between them is achieved through metal heat exchange surfaces. When the high-temperature, high-pressure refrigerant flows through the first condenser 13, it releases heat and condenses into a high-pressure liquid state; at the same time, the water at the first temperature absorbs heat in the first condenser 13 and its temperature rises to the second temperature. Preferably, the condenser shell can be made of stainless steel or copper to improve corrosion resistance and heat exchange efficiency.

[0071] The first expansion valve 15 has its inlet connected to the outlet of the first condenser 13. The first expansion valve 15 is used to throttle and reduce the pressure of the high-pressure liquid refrigerant after cooling by the condenser, lowering the refrigerant pressure to a low-temperature, low-pressure wet vapor state so that it can enter the first evaporator 17 to absorb heat. Preferably, the first expansion valve 15 can be a thermostatic expansion valve or an electronic expansion valve, which automatically adjusts its opening by detecting the superheat at the evaporator outlet, thereby precisely controlling the refrigerant flow rate and preventing the evaporator from frosting or running dry.

[0072] The first evaporator 17 has its liquid inlet connected to the liquid outlet of the first expansion valve 15, and its liquid outlet connected to the liquid inlet of the first compressor 11. During operation, the first evaporator 17 allows the low-temperature, low-pressure wet refrigerant to absorb heat from the surrounding air and completely evaporate into low-pressure superheated gas, which is then drawn into the first compressor 11 for the next cycle. Preferably, the first evaporator 17 can be a finned tube structure, and an external axial flow fan can be provided to continuously blow outdoor air across its surface to improve heat absorption efficiency. A hydrophobic coating can also be applied to the fin surface of the first evaporator 17 to reduce frost formation and facilitate defrosting, thereby ensuring stable operation in low-temperature environments.

[0073] Furthermore, in this embodiment, the first end of the first section of pipe 41 is connected to the first condenser 13, and the first end of the second section of pipe 42 is connected to the condenser, so that water at the first temperature is heated to the second temperature after passing through the first condenser 13 and enters the second section of pipe 42. Specifically, the first section of pipe 41 can be made of high-temperature and pressure-resistant metal pipe (such as stainless steel pipe, copper pipe) or composite insulation pipe to reduce heat loss during transportation. The length and inner diameter of the first section of pipe 41 can be designed according to the installation distance and flow requirements to ensure that water at the first temperature can reach the first condenser 13 in a short time and achieve efficient heat exchange. The outlet of the first condenser 13 and the inlet of the second section of pipe 42 can be reliably sealed through flanges, quick-connect fittings, or welding to prevent leakage or excessive pressure drop. The second section of pipe 42 can be equipped with a temperature sensor or flow meter to detect the temperature and flow rate of water at the second temperature in real time, which facilitates the control system to judge the heating effect and adjust the operating parameters.

[0074] In an optional embodiment, the second-stage air-source heat pump enhancement component 20 may specifically include:

[0075] The second compressor 21 is used to compress the refrigerant into a high-temperature, high-pressure gas.

[0076] The second condenser 23 has its inlet end connected to the outlet end of the second compressor 21 and is used to supply water at the second temperature and heat it to the second temperature.

[0077] The second expansion valve 25 has its inlet end connected to the outlet end of the second condenser 23.

[0078] The second evaporator 27 has its inlet end connected to the outlet end of the second expansion valve 25, and its outlet end connected to the inlet end of the second compressor 21.

[0079] The sub-components and structures in the second-stage air source heat pump assembly 20 are basically the same as those in the first-stage air source heat pump assembly 10, and will not be described in detail here.

[0080] Furthermore, in this embodiment, the second end of the second section of pipe 42 is connected to the second condenser 23, and the first end of the third section of pipe 43 is connected to the second condenser 23, so that water at the second temperature is heated to the third temperature after passing through the second condenser 23 and then enters the third section of pipe 43. The materials used for the first section of pipe 41, the second section of pipe 42, and the third section of pipe 43 are basically the same, and will not be described in detail here.

[0081] In an optional embodiment, the circulating air source heat pump water heater further includes a return water electric valve 90, which is connected to the insulated water tank 30 and used to control the flow of water returning to the insulated water tank 30 from the external water user. Specifically, the return water electric valve 90 can be a ball valve, butterfly valve, or straight-through electric valve, and its valve body material can be stainless steel, brass, or high-temperature engineering plastic to adapt to the long-term hot water circulation operating environment. Preferably, the return water electric valve 90 can be installed on the return water pipe and connected to the return water port of the insulated water tank 30, so that unused hot water or cooled circulating water at the user end can flow back to the insulated water tank 30 for reheating.

[0082] For an illustrative example, please refer to [link / reference]. Figures 2 to 4 This document provides a comparison table of electricity consumption for heating 10 tons of chilled water from 15 degrees Celsius to 55 degrees Celsius, using a screw compressor as an example. The circulating air source heat pump water heater described in this application, compared to a traditional circulating air source heat pump water heater system, is tested under the same conditions (same ambient temperature, same compressor model, same chilled water temperature, same hot water temperature, same condenser resistance). Note: In a traditional circulating air source heat pump water heater system, two air source heat pumps are used for calculation.

[0083] The data above leads to the conclusion that the circulating air source heat pump water heater of this application, due to its staged heating, achieves higher heating efficiency in the first stage due to the reduced condensation temperature. Furthermore, the reduced power of the circulating pump lowers the overall power consumption for hot water production, resulting in an energy saving rate of 8.26%. This energy-saving comparative analysis uses a screw compressor as an example; other scroll compressors also exhibit similar characteristics, but their energy-saving rates may differ.

[0084] It should be noted that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. The directional terms "inner" and "outer" refer to the inside or outside relative to the outline of the component itself. For example, if a device in the drawings is inverted, a device described as "above" or "on top of" other devices or structures will subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0085] It should also be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this application refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this application.

[0086] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0087] It should also be noted that the above are merely preferred embodiments of this application and do not limit the scope of patent protection of this application. Any equivalent structural or procedural changes made using the content of this application’s specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. A circulating air source heat pump water heater, characterized in that, include: The first-stage air source heat pump assembly includes a first water inlet and a first water outlet. The second-stage air source heat pump adds components, including a second water inlet and a second water outlet; The insulated water tank includes a third inlet and a third outlet. The first section of the pipeline connects the third water outlet and the first water inlet. The second section of pipeline connects the first water outlet and the second water inlet. The third section of the pipeline connects the second outlet and the third inlet. A circulating pump is connected in series in the first section of the pipeline; A proportional-integral regulating valve is connected to a portion of the first section of pipeline between the circulating pump and the insulated water tank, and is used to replenish water to the insulated water tank; The circulating pump is used to transport water at a first temperature along the first section of the pipeline to the first-stage air-source heat pump assembly. The first-stage air-source heat pump assembly is used to heat the water at the first temperature to a second temperature and transport the water at the second temperature through the second section of the pipeline to the second-stage air-source heat pump assembly. The second-stage air-source heat pump assembly is used to heat the water at the second temperature to a third temperature and transport the water at the third temperature through the third section of the pipeline to the insulated water tank.

2. The circulating air source heat pump water heater according to claim 1, characterized in that, It also includes a water level detection component, which is installed on the insulated water tank and is used to detect the water level in the insulated water tank; The proportional-integral regulating valve opens and closes based on the water level in the insulated water tank.

3. The circulating air source heat pump water heater according to claim 2, characterized in that, It also includes a water temperature detection component, which is installed on the insulated water tank and is used to detect the temperature of the water in the insulated water tank and the temperature of the water in the third section of the pipeline; The proportional-integral regulating valve is also opened and closed based on the water level in the insulated water tank and the water temperature in the third section of the pipeline.

4. The circulating air source heat pump water heater according to claim 3, characterized in that, It also includes a hot water supply pump, which is connected to the insulated water tank and is used to input the water in the insulated water tank to external equipment.

5. The circulating air source heat pump water heater according to any one of claims 1 to 4, characterized in that, The first-stage air source heat pump assembly includes: The first compressor is used to compress the refrigerant into a high-temperature, high-pressure gas; The first condenser has its inlet end connected to the outlet end of the first compressor and is used to allow water at the first temperature to pass through and heat it to the second temperature. The first expansion valve has its inlet end connected to the outlet end of the first condenser. The first evaporator has its inlet end connected to the outlet end of the first expansion valve, and its outlet end connected to the inlet end of the first compressor.

6. The circulating air source heat pump water heater according to claim 5, characterized in that, The first end of the first section of the pipeline is connected to the first condenser, and the first end of the second section of the pipeline is connected to the condenser, so that water at the first temperature is heated to the second temperature after passing through the first condenser and then enters the second section of the pipeline.

7. The circulating air source heat pump water heater according to any one of claims 1 to 4, characterized in that, The second-stage air source heat pump assembly includes: The second compressor is used to compress the refrigerant into a high-temperature, high-pressure gas; The second condenser has its inlet end connected to the outlet end of the second compressor and is used to supply water at the second temperature and heat it to the second temperature. The second expansion valve has its inlet end connected to the outlet end of the second condenser. The second evaporator has its inlet end connected to the outlet end of the second expansion valve, and its outlet end connected to the inlet end of the second compressor.

8. The circulating air source heat pump water heater according to claim 7, characterized in that, The second end of the second section of the pipeline is connected to the second condenser, and the first end of the third section of the pipeline is connected to the second condenser, so that water at the second temperature is heated to the third temperature after passing through the second condenser and then enters the third section of the pipeline.

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