Inverter heat pump water heater with multi-functional high-efficiency heat exchanger

Abstract

This application discloses a variable frequency heat pump water heater unit with a multi-functional high-efficiency heat exchanger, including a variable frequency compressor, a finned heat exchanger, a four-way valve, a hot water storage tank, and the multi-functional high-efficiency heat exchanger. The four-way valve includes a first connection port, a second connection port, a third connection port, and a fourth connection port. The finned heat exchanger includes a third liquid inlet, a fourth liquid inlet, a first liquid outlet, and a second liquid outlet. The second connection port is connected to the second liquid outlet via a third pipe, and the first liquid outlet and the fourth liquid inlet are connected via a fourth pipe. The multi-functional high-efficiency heat exchanger includes a first water inlet and a first water outlet. The hot water storage tank includes a second water inlet and a second water outlet. The first water inlet and the second water outlet are connected via a tenth pipe, and the second water inlet and the first water outlet are connected via an eleventh pipe. The piping is relatively simple and the structure is more compact.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of heating, ventilation and air conditioning, and in particular to a variable frequency heat pump water heater with a multifunctional high-efficiency heat exchanger. BACKGROUND

[0002] Air source heat pump water heaters, as an energy-saving and environmentally friendly type of water heating equipment, have replaced other water heating equipment and taken a place in the market. In recent years, with the rise of low-temperature heat pump technology, major heat pump manufacturers have developed low-temperature heat pump water heater units through various technical forces, making the use area of heat pump water heater units more extensive. From the current market, most low-temperature heat pumps are configured with an economizer and a liquid accumulator, and the pipeline is relatively complex, and the liquid accumulator and the economizer also occupy design space. SUMMARY

[0003] In view of the above defects or deficiencies in the prior art, it is desirable to provide a variable frequency heat pump water heater unit with a multifunctional high-efficiency heat exchanger, which has a simple pipeline and a compact structure.

[0004] In a first aspect, the variable frequency heat pump water heater unit with a multifunctional high-efficiency heat exchanger comprises a variable frequency compressor, a fin heat exchanger, a four-way valve, a hot water storage tank, and a multifunctional high-efficiency heat exchanger, the four-way valve comprises a first connecting port, a second connecting port, a third connecting port, and a fourth connecting port,

[0005] When the four-way valve is in a power-off state, the first connecting port is in communication with the second connecting port, and the third connecting port is in communication with the fourth connecting port;

[0006] When the four-way valve is in a power-on state, the first connecting port is in communication with the fourth connecting port, and the second connecting port is in communication with the third connecting port,

[0007] The variable frequency compressor comprises an exhaust port, a first gas inlet, and a second gas inlet, the exhaust port is in communication with the third connecting port through a first pipeline, the first gas inlet is in communication with the first connecting port through a second pipeline,

[0008] The fin heat exchanger comprises a third liquid inlet, a fourth liquid inlet, a first liquid outlet, and a second liquid outlet, the second connecting port is in communication with the second liquid outlet through a third pipeline, the first liquid outlet and the fourth liquid inlet are in communication through a fourth pipeline, and the fourth pipeline is provided with a first electronic expansion valve,

[0009] The multifunctional high-efficiency heat exchanger comprises a third liquid outlet, a fourth liquid outlet, a fifth liquid inlet and a sixth liquid inlet, the fourth liquid outlet and the second gas inlet are communicated through a fifth pipeline, the fifth liquid inlet and the fourth connecting port are communicated through a sixth pipeline, the third liquid inlet and the third liquid outlet are communicated through a seventh pipeline, the third liquid outlet and the sixth liquid inlet are communicated through an eighth pipeline, the eighth pipeline is provided with a second electronic expansion valve, the fourth liquid inlet is communicated with the seventh pipeline through a ninth pipeline, the ninth pipeline is provided with a defrosting electromagnetic valve,

[0010] The multifunctional high-efficiency heat exchanger comprises a first water inlet and a first water outlet, the heat storage water tank comprises a second water inlet and a second water outlet, the first water inlet and the second water outlet are communicated through a tenth pipeline, and the second water inlet and the first water outlet are communicated through an eleventh pipeline.

[0011] According to the technical scheme provided in the embodiment of the application, the multifunctional high-efficiency heat exchanger can be used for three purposes, that is, first, the multifunctional high-efficiency heat exchanger can play the role of a conventional condenser to fully condense high-temperature and high-pressure gas into high-pressure and medium-temperature liquid; second, the multifunctional high-efficiency heat exchanger can store liquid according to the change of liquid supply in the system to automatically adjust the liquid level; and third, the multifunctional high-efficiency heat exchanger can play the role of fluorine-fluorine heat exchange to replace the economizer commonly used in the air supplement and enthalpy increase system, so that the pipeline is relatively simple and the structure is more compact. BRIEF DESCRIPTION OF DRAWINGS

[0012] Other characteristics, objects and advantages of the application will become more apparent from the following detailed description of non-restrictive embodiments, made with reference to the attached drawings:

[0013] Figure 1 The figure is a structural schematic view of the variable frequency heat pump water heater with the multifunctional high-efficiency heat exchanger. DETAILED DESCRIPTION

[0014] The application will be described in further detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related application, and are not a limitation on the application. In addition, it should be noted that only parts related to the application are shown in the drawings for ease of description.

[0015] It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict. The application will be described in detail below with reference to the drawings and embodiments.

[0016] Please refer to Figure 1The variable frequency heat pump water heater with the multifunctional high-efficiency heat exchanger comprises a variable frequency compressor 100, a fin heat exchanger 200, a four-way valve 300, a heat storage water tank 400 and a multifunctional high-efficiency heat exchanger 500, the four-way valve 300 comprises a first connecting port, a second connecting port, a third connecting port and a fourth connecting port, when the four-way valve 300 is in a power-off state, the first connecting port is communicated with the second connecting port, and the third connecting port is communicated with the fourth connecting port; when the four-way valve 300 is in a power-on state, the first connecting port is communicated with the fourth connecting port, and the second connecting port is communicated with the third connecting port, the variable frequency compressor 100 comprises an exhaust port 110, a first gas inlet 120 and a second gas inlet 130, the exhaust port 110 is communicated with the third connecting port through a first pipeline 601, the first gas inlet 120 is communicated with the first connecting port through a second pipeline 602, the fin heat exchanger 200 comprises a third liquid inlet 210, a fourth liquid inlet 220, a first liquid outlet 230 and a second liquid outlet 240, the second connecting port is communicated with the second liquid outlet 240 through a third pipeline 603, the first liquid outlet 230 and the fourth liquid inlet 220 are communicated through a fourth pipeline 604, the fourth pipeline 604 is provided with a first electronic expansion valve 710, the multifunctional high-efficiency heat exchanger 500 comprises a third liquid outlet 510, a fourth liquid outlet 520, a fifth liquid inlet 530 and a sixth liquid inlet 540, the fourth liquid outlet 520 and the second gas inlet 130 are communicated through a fifth pipeline 605, the fifth liquid inlet 530 and the fourth connecting port are communicated through a sixth pipeline 606, the third liquid inlet 210 and the third liquid outlet 510 are communicated through a seventh pipeline 607, the third liquid outlet 510 and the sixth liquid inlet 540 are communicated through an eighth pipeline 608, the eighth pipeline 608 is provided with a second electronic expansion valve 720, the fourth liquid inlet 220 is communicated with the seventh pipeline 607 through a ninth pipeline 609, the ninth pipeline 609 is provided with a defrosting electromagnetic valve 730, the multifunctional high-efficiency heat exchanger 500 comprises a first water inlet 550 and a first water outlet, the heat storage water tank 400 comprises a second water inlet 560410 and a second water outlet 420, the first water inlet 550 and the second water outlet 420 are communicated through a tenth pipeline 610, and the second water inlet 560410 and the first water outlet are communicated through an eleventh pipeline 611.

[0017] In the embodiment of the present application, when the four-way valve 300 is in the power-off state, the first connecting port communicates with the second connecting port, and the third connecting port communicates with the fourth connecting port. That is, the second pipeline 602 communicates with the third pipeline 603, and the first pipeline 601 communicates with the sixth pipeline 606. The variable frequency heat pump hot water unit is in the hot water state. At this time, the high-temperature and high-pressure refrigerant discharged by the variable frequency compressor 100 enters the multifunctional high-efficiency heat exchanger 500 to condense into liquid and is stored at the same time through the first pipeline 601, the four-way valve 300, the sixth pipeline 606 and the fifth liquid inlet 530. The liquid refrigerant is divided into two paths after coming out of the multifunctional high-efficiency heat exchanger 500. One path enters the first electronic expansion valve 710 through the seventh pipeline 607 for throttling and finally enters the fin heat exchanger 200 to absorb heat and evaporate. The evaporated gas is sucked into the variable frequency compressor 100 through the third pipeline 603, the second pipeline 602 and the first gas inlet 120 and is then discharged. The other path is an auxiliary circuit. A small part of the liquid refrigerant enters the multifunctional high-efficiency heat exchanger 500 through the eighth pipeline 608 after throttling by the second electronic expansion valve 720 to absorb the heat of the liquid refrigerant and evaporate. The evaporated gas enters the intermediate cavity of the variable frequency compressor 100 through the fifth pipeline 605 and the second gas inlet 130 to realize the function of fluorine-fluorine heat exchange, replacing the economizer commonly used in the gas supplement and enthalpy increase system. The heat pump cycle is repeated in this way. The water in the hot water storage tank 400 enters the multifunctional high-efficiency heat exchanger 500 through the tenth pipeline 610. In the multifunctional high-efficiency heat exchanger 500, the high-temperature and high-pressure refrigerant releases heat, and the water absorbs heat to heat the water. The heated water flows back to the hot water storage tank 400 through the eleventh pipeline 611 to realize stable hot water production.

[0018] When the four-way valve 300 is in the power-on state, the first connecting port communicates with the fourth connecting port, and the second connecting port communicates with the third connecting port. That is, the first pipeline 601 communicates with the third pipeline 603, and the second pipeline 602 communicates with the sixth pipeline 606. When the ambient temperature is low in winter, the frost on the fins of the fin heat exchanger 200 seriously affects the efficiency of the unit, which can be solved by reversing defrosting through the four-way valve 300. The defrosting valve is opened, the high-temperature and high-pressure gas refrigerant discharged by the variable frequency compressor 100 enters the fin heat exchanger 200 to condense into liquid after entering the fin heat exchanger 200 through the first pipeline 601 and the four-way valve 300 (power-on state) and the third pipeline 603, and then enters the multifunctional high-efficiency heat exchanger 500 through the ninth pipeline 609 and the seventh pipeline 607 to evaporate and is sucked into the variable frequency compressor 100 through the sixth pipeline 606 and the second pipeline 602. The high-temperature and high-pressure gas refrigerant releases heat in the fin heat exchanger 200 to heat and defrost the fin heat exchanger 200, ensuring the normal operation of the variable frequency heat pump hot water unit.

[0019] The variable frequency unit can cause poor oil return of the variable frequency compressor 100 in some severe working conditions or during long time low frequency operation, which seriously affects the service life of the unit. Therefore, the unit speed is forced to increase at regular intervals during the design of the entire heat pump control system, and the oil in the fin heat exchanger 200 is brought out through the four-way valve 300 switching.

[0020] The heat pump hot water unit adopts a direct current variable frequency compressor 100. When the temperature of the heat storage water tank 400 is lower than the set temperature and the compressor loading is met, the compressor first rises to 45 Hz and stably operates for 3 minutes, and then enters the corresponding frequency operation according to the frequency regulation control table. If the corresponding frequency is less than 45 Hz, the frequency is directly reduced to the corresponding frequency operation. If the corresponding frequency is greater than 45 Hz, the frequency is increased to 70 Hz and stably operated for 3 minutes. If it needs to continue to increase the frequency, it is stably operated for 30 seconds every 10 Hz until it rises to the required frequency of the unit. When the water temperature of the heat storage water tank 400 approaches the set value, the unit starts to reduce the frequency, and is stably operated for 30 seconds every 10 Hz until the heat storage water tank 400 reaches the set value. After reaching the set value, the unit is stably operated for 3 minutes at the minimum frequency and then completely unloaded.

[0021] The heat pump hot water unit adopts double electronic expansion valve control. The opening degree of the electronic expansion valve is adjusted according to the difference between the suction temperature and the evaporation temperature. The system uses a pressure sensor instead of a fin temperature sensor to obtain the evaporation temperature more accurately, reduces the control error, and makes the refrigerant flow distribution more reasonable, flexible and fast.

[0022] The heat pump hot water unit has compact structure and relatively simple pipeline. The unit compressor adopts variable frequency compressor 100 variable flow technology, and the outdoor fan motor adopts EC variable frequency series. The air volume can be adjusted according to the change of ambient temperature. The unit performance is reliable and stable, and the comprehensive energy efficiency is high throughout the year. The heat pump hot water unit can stably produce 55℃ hot water all year round, and can automatically and reasonably adjust the speed of the compressor or fan 770 according to the change of ambient temperature, which can well control the exhaust temperature and pressure, make up for the defects of the heat pump system that the liquid injection reduces the exhaust and greatly reduces the heating capacity and energy efficiency of the unit, and always ensure the high energy efficiency of the unit. In the design of the entire heat pump system, a multifunctional high-efficiency heat exchanger 500 is adopted. The heat exchanger has compact structure, integrates heat exchange, liquid storage and enthalpy increase technology, greatly reduces the design size of the unit, and optimizes the pipeline design. The unit runs more reliably and stably.

[0023] Further, the second pipeline 602 is provided with a vapor-liquid separator 740.

[0024] In the embodiment of the present application, the second pipeline 602 is provided with a vapor-liquid separator 740, which is located between the multifunctional high-efficiency heat exchanger 500 and the variable frequency compressor 100. The vapor-liquid separator 740 prevents the low-pressure and low-temperature refrigerant returning to the variable frequency compressor 100 from carrying too many liquid droplets, prevents the liquid refrigerant from entering the cylinder of the variable frequency compressor 100, and prevents liquid impact on the variable frequency compressor 100.

[0025] Further, the fourth pipeline 604 is provided with a copper filter 750, which is located between the first electronic expansion valve 710 and the first liquid outlet 230.

[0026] In the embodiment of the present application, the copper filter 750 can eliminate impurities in the liquid refrigerant to ensure the normal use of the first electronic expansion valve 710.

[0027] Further, the ninth pipeline 609 is provided with a one-way valve 760. The one-way valve 760 replaces the electronic expansion valve in reverse during defrosting, increases the refrigerant flow during defrosting, greatly shortens the defrosting period, makes defrosting more thorough, and improves the operation efficiency of the unit.

[0028] Further, the fin heat exchanger 200 is provided with a variable frequency outdoor fan 770. During the operation of the heat pump water heater unit, the outdoor fan 770 forces air flow to improve the heat exchange effect between the refrigerant and the air. The main purpose of using the variable frequency outdoor fan 770 is to vary the air volume, and its operation basically corresponds to the variable frequency compressor 100. When the variable frequency compressor 100 increases the frequency to improve the speed, the variable frequency outdoor fan 770 will also increase the speed accordingly. When the variable frequency compressor 100 decreases the frequency, the variable frequency outdoor fan 770 also decreases the frequency. Of course, under certain specific working conditions, the adjustable speed of the variable frequency outdoor fan 770 can solve the problem of overheating of the unit. During defrosting, the variable frequency outdoor fan 770 does not output. The motor of the variable frequency outdoor fan 770 is an EC motor, which can be adjusted by 0-10V.

[0029] Further, the tenth pipeline 610 is provided with a circulating pump 780. The circulating pump 780 can draw the water in the heat storage water tank 400 to the multifunctional high-efficiency heat exchanger 500 through the tenth pipeline 610.

[0030] Further, the hot water storage tank 400 is provided with a water supplement pipeline 790. If the liquid level in the hot water storage tank 400 reaches a low liquid level and the temperature of the tank is not lower than 45℃, or the liquid level in the hot water storage tank 400 is lower than an ultralow liquid level, water is supplemented to the hot water storage tank 400 through the water supplement pipeline 790 until the liquid level in the hot water storage tank 400 reaches a high liquid level and the water supplement is stopped. The hot water storage tank 400 is provided with a water level switch. When the liquid level reaches a low liquid level and the temperature of the hot water storage tank 400 is not lower than 45℃, or the liquid level is lower than an ultralow liquid level, water can be supplemented. The water supplement is stopped until the liquid level in the hot water storage tank 400 reaches a high liquid level. Cold water is sent to the multifunctional high-efficiency heat exchanger 500 by the circulating pump 780, and then returned to the hot water storage tank 400 after being warmed up. The water flow of the circulating pump 780 is designed according to a 5℃ temperature difference between the inlet and outlet water, and the set temperature is 55℃. When the water supply temperature is lower than 45℃ or the liquid level is low, the water supply is stopped, and the water supplement pipeline 790 can supplement water to the hot water storage tank 400 in time.

[0031] The above description is merely preferred embodiments of the present application and a description of the principles of the technology used. It should be understood by those skilled in the art that the scope of the application disclosed in the present application is not limited to the technical solutions formed by the specific combinations of the above technical features, and should also cover other technical solutions formed by any combinations of the above technical features or equivalent features without departing from the inventive concept. For example, the above features can be replaced with technical features disclosed in the present application (but not limited to) having similar functions to form technical solutions.

Claims

1. A variable frequency heat pump water heater unit with a multifunctional high-efficiency heat exchanger, characterized in that, The system includes a variable frequency compressor, a finned heat exchanger, a four-way valve, a hot water storage tank, and a multi-functional high-efficiency heat exchanger. The four-way valve includes a first connection port, a second connection port, a third connection port, and a fourth connection port. When the four-way valve is de-energized, the first connection port is connected to the second connection port, and the third connection port is connected to the fourth connection port; When the four-way valve is energized, the first connection port is connected to the fourth connection port, and the second connection port is connected to the third connection port. The variable frequency compressor includes an exhaust port, a first intake port, and a second intake port. The exhaust port is connected to the third connection port via a first pipe, and the first intake port is connected to the first connection port via a second pipe. The finned heat exchanger includes a third liquid inlet, a fourth liquid inlet, a first liquid outlet, and a second liquid outlet. The second connection port is connected to the second liquid outlet via a third pipe. The first liquid outlet and the fourth liquid inlet are connected via a fourth pipe, and the fourth pipe is equipped with a first electronic expansion valve. The multifunctional high-efficiency heat exchanger includes a third liquid outlet, a fourth liquid outlet, a fifth liquid inlet, and a sixth liquid inlet. The fourth liquid outlet and the second air inlet are connected via a fifth pipe. The fifth liquid inlet and the fourth connection port are connected via a sixth pipe. The third liquid inlet and the third liquid outlet are connected via a seventh pipe. The third liquid outlet and the sixth liquid inlet are connected via an eighth pipe, which is equipped with a second electronic expansion valve. The fourth liquid inlet is connected to the seventh pipe via a ninth pipe, which is equipped with a defrosting solenoid valve. The multifunctional high-efficiency heat exchanger includes a first inlet and a first outlet, and the hot water storage tank includes a second inlet and a second outlet. The first inlet and the second outlet are connected by a tenth pipeline, and the second inlet and the first outlet are connected by an eleventh pipeline.

2. The variable frequency heat pump water heater unit with a multifunctional high-efficiency heat exchanger of claim 1, characterized in that, The second pipeline is equipped with a vapor-liquid separator.

3. The variable frequency heat pump water heater unit with a multifunctional high-efficiency heat exchanger of claim 1, characterized in that, The fourth pipeline is equipped with a copper filter, which is located between the first electronic expansion valve and the first liquid outlet.

4. The variable frequency heat pump water heater unit with a multifunctional high-efficiency heat exchanger of claim 1, characterized in that, The ninth pipeline is equipped with a one-way valve.

5. The variable frequency heat pump water heater unit with multi-functional high-efficiency heat exchanger of claim 1, wherein, The finned heat exchanger is equipped with a variable frequency external fan.

6. The variable frequency heat pump water heater unit with multi-functional high-efficiency heat exchanger of claim 1, characterized in that, The tenth pipeline is equipped with a circulation pump.

7. The variable frequency heat pump water heater unit with multi-functional high-efficiency heat exchanger of claim 1, wherein, The hot water storage tank is equipped with a water supply pipe. If the liquid level in the hot water storage tank reaches a low level and the water temperature in the tank is not lower than 45°C, or if the liquid level in the hot water storage tank is lower than the ultra-low level, water will be added to the hot water storage tank through the water replenishment pipeline until the liquid level in the hot water storage tank reaches a high level and then water replenishment will stop.

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