CN113251660B - Heat pump water heater and control method thereof - Google Patents

Abstract

The invention discloses a heat pump water heater and a control method thereof. Multifunctional heat pump set includes: the air conditioner comprises a shell, a first air inlet and a first air outlet, wherein a mounting cavity is formed in the shell; the compressor, the evaporator and the fan are arranged in the mounting cavity, and the fan is used for driving air to enter the mounting cavity, and outputting the air after heat exchange through the evaporator; the temperature sensor is arranged on the shell and used for detecting the air inlet temperature of the first air inlet; the compressor, the fan and the temperature sensor are respectively and electrically connected with the electric control board. The heat pump unit can intelligently adjust the indoor temperature to enrich the use function of the heat pump unit and improve the user experience.

Description

Heat pump water heater and control method thereof

Technical Field

The invention belongs to the technical field of household appliances, and particularly relates to a heat pump water heater and a control method thereof.

Background

At present, a water heater is a household appliance commonly used in daily life of people. The water heater is generally divided into an electric water heater, a gas water heater and a heat pump water heater, and the heat pump water heater is widely popularized and used due to high energy efficiency.

Heat pump water heaters typically include a heat pump unit consisting of a compressor, an evaporator and a blower, and a water tank typically including a tank shell, an inner tank and a condenser. The heat pump unit of the conventional heat pump water heater is usually placed outdoors, and the installation requirement cannot be met for high-rise buildings. Chinese patent No. 201110059903.3 discloses a semi-hidden assembled air source heat pump water heater, adopts the mode of hanging the installation, disposes air intake and air outlet on the heat pump set and satisfies the heat transfer requirement of evaporimeter.

The heat pump unit is limited by indoor use, and the heating efficiency needs to be improved as much as possible to shorten the operation time of the heat pump unit. The condenser used in the water tank used in cooperation with the condenser usually adopts a coil heat exchanger or a microchannel heat exchanger. In the actual use process, the phenomenon that the heat exchange efficiency of the condenser is low due to uneven distribution of the refrigerant occurs. In view of this, how to design a heat pump water heater with high heating efficiency is a technical problem to be solved by the invention.

Disclosure of Invention

The invention provides a heat pump water heater and a control method thereof, which are characterized in that gas-liquid separation is carried out on gas-liquid mixed refrigerant flowing in a collecting pipe through a gas-liquid separation plate, so that the heat of a condenser is uniformly distributed, the heating efficiency of a water tank is improved, and the running time of the heat pump water heater is shortened.

In order to achieve the technical purpose, the invention adopts the following technical scheme:

in one aspect, the present invention provides a heat pump water heater comprising:

the heat pump unit comprises a shell, and a compressor, an evaporator, a fan and a throttling device which are arranged in the shell;

the water tank comprises a tank shell, and an inner container and a condenser which are arranged in the tank shell, and the compressor, the evaporator, the throttling device and the condenser are connected to form a refrigerant circulating flow path;

wherein, the condenser includes: the micro-channel pipes are connected between the two collecting pipes and attached to the outer wall of the inner container, at least one gas-liquid separation plate is arranged in each collecting pipe, and a liquid discharge hole is formed in each gas-liquid separation plate.

Furthermore, a floating body is arranged on the gas-liquid separation plate and used for opening and closing the liquid discharge hole by utilizing buoyancy.

Furthermore, a groove is formed in the gas-liquid separation plate, the drain hole is formed in the bottom of the groove, and the floating body is located in the groove.

Furthermore, an elastic plate for opening and closing the liquid discharge hole is arranged on the gas-liquid separation plate, one end of the elastic plate is fixed to the lower surface of the gas-liquid separation plate, and the elastic plate is attached to the lower surface of the gas-liquid separation plate and covers the liquid discharge hole.

Further, the housing includes: the air conditioner comprises a base, wherein an installation part for hanging installation is arranged on the base, and a first air inlet and a first air outlet are also arranged on the base; the cover is arranged on the base, and an installation cavity is formed between the cover and the base; wherein the compressor, the evaporator and the fan are disposed on the base.

Furthermore, a second air inlet and a second air outlet are arranged on the housing; the heat pump set further comprises: the air guide cover is arranged on the base and positioned in the mounting cavity, the air guide cover covers the air outlet side of the evaporator, and an air outlet cavity is formed between the air guide cover and the evaporator; the first air outlet and the second air outlet are communicated with the air outlet cavity respectively, and the first air inlet and the second air inlet are communicated with the installation cavity respectively.

Further, the heat pump unit further comprises: the air door assembly is used for selectively opening and closing the first air inlet, the first air outlet, the second air inlet and the second air outlet.

Further, the heat pump unit further comprises: and the temperature sensor is arranged on the shell and is used for detecting the air inlet temperature of the first air inlet.

Further, the heat pump unit further comprises: and the electric heater is positioned on the air outlet side of the evaporator.

In another aspect, the present invention also provides a control method of the heat pump water heater, including: when the temperature sensor detects that the inlet air temperature of the first air inlet is higher than a set temperature value, starting the fan and the compressor; indoor air enters the installation cavity through the first air inlet, exchanges heat with the evaporator and then is conveyed back to the room through the first air outlet.

Compared with the prior art, the invention has the advantages and positive effects that: through dispose the gas-liquid separation board in the pressure manifold, the outage on the gas-liquid separation board can in time arrange liquid refrigerant to the below of pressure manifold to reduce during the refrigerant of gas-liquid mixture state enters into the microchannel pipe, the gaseous refrigerant can be fast smooth and easy via the heat transfer of microchannel pipe to the biggest assurance, so that the whole heat transfer volume of microchannel heat exchanger distributes evenly, and then improve the heating efficiency of water tank effectively, with the operating duration that shortens heat pump set, and then improve heat pump water heater's user experience nature.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a reference diagram illustrating the operation of a heat pump unit according to an embodiment of the heat pump water heater of the present invention;

FIG. 2 is a schematic view of a water tank according to an embodiment of the heat pump water heater of the present invention;

FIG. 3 is a schematic view of a heat pump unit according to an embodiment of the heat pump water heater of the present invention;

FIG. 4 is one of the partial exploded views of FIG. 3;

FIG. 5 is a second partial exploded view of FIG. 3;

FIG. 6 is a schematic structural view of the base of FIG. 3;

FIG. 7 is a schematic structural diagram of a heat pump unit in another embodiment of the heat pump water heater of the present invention;

FIG. 8 is one of cross-sectional views of a heat pump unit according to another embodiment of the heat pump water heater of the present invention;

FIG. 9 is a second cross-sectional view of a heat pump unit according to another embodiment of the heat pump water heater of the present invention;

FIG. 10 is an exploded view of the wind scooper of the heat pump water heater according to the embodiment of the present invention;

FIG. 11 is an assembled cross-sectional view of the base and the wind scooper of the heat pump water heater according to the embodiment of the present invention;

FIG. 12 is an assembly view of an evaporator and an electric heater according to an embodiment of the heat pump water heater of the present invention;

FIG. 13 is a schematic structural diagram of a condenser in an embodiment of a heat pump water heater according to the present invention;

FIG. 14 is one of the schematic structural views of the gas-liquid separation plate of FIG. 13;

FIG. 15 is a second schematic structural view of the gas-liquid separation plate shown in FIG. 13;

FIG. 16 is a control flow diagram of an embodiment of the heat pump water heater of the present invention;

fig. 17 is a control flow chart of another embodiment of the heat pump water heater of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In a first embodiment, as shown in fig. 1 and 2, the present invention provides a heat pump water heater, which generally comprises a heat pump unit 100 and a water tank 200. The heat pump unit 100 includes a housing, and a compressor, an evaporator, a throttle device, and a blower installed in the housing, and the water tank 200 includes a tank case (not shown), an inner container 201, and a condenser 202.

The compressor, the evaporator, the throttle device, and the condenser 202 are connected to form a refrigerant circulation flow path, and heat treatment is performed on water in the inner tank 201 by using the principle of a heat pump. The above is the basic configuration of a conventional heat pump water heater, and is not limited and described herein.

In order to improve the heating efficiency of the water tank 200, as shown in fig. 2, 13, 14 and 15, the condenser 202 used in the water tank 200 employs a micro-channel heat exchanger including: two collecting pipes 1 'and a plurality of microchannel pipes 2'; a plurality of microchannel tubes 2 'are arranged side by side and connected between the two collecting pipes 1'; at least one gas-liquid separation plate 3 'is respectively arranged in the two collecting pipes 1', and the gas-liquid separation plate 3 'is provided with a liquid discharge hole 31'.

The collecting pipe 1 'is divided into a plurality of sections of flow channels by the gas-liquid separating plate 3' through the gas-liquid separating plate 3 'arranged in the collecting pipe 1', and the microchannel pipe 2 'is correspondingly communicated with the flow channels on two sides, so that the refrigerant flows along the microchannel pipe 2' from top to bottom. When the gaseous refrigerant enters the microchannel heat exchanger to be conveyed, the gaseous refrigerant can form part of liquid refrigerant after heat exchange, and the transmission speed of the liquid refrigerant in the microchannel pipe 2' is lower. Therefore, the liquid refrigerant in the gas-liquid mixed state in the header pipe 1 'falls onto the gas-liquid separation plate 3' by gravity, and the liquid refrigerant rapidly flows toward the bottom of the header pipe 1 'through the drain hole 31'. Thus, the liquid refrigerant can rapidly flow to the bottom of the collecting pipe 1 'through the liquid discharge hole 31', and the gaseous refrigerant can smoothly flow in the microchannel pipe 2', so that the problem of low heat exchange efficiency caused by the gas-liquid mixed refrigerant flowing into the microchannel pipe 2' is effectively solved.

The gas-liquid separation plate 3 'is utilized to carry out gas-liquid separation on gas-liquid mixed refrigerants in the collecting pipe 1', on one hand, liquid refrigerants can flow to the bottom of the collecting pipe 1 'rapidly to output the liquid refrigerants rapidly, on the other hand, gas resistance of the liquid refrigerants to gaseous refrigerants in the micro-channel pipe 2' can be reduced, so that the transmission speed of the gaseous refrigerants is increased, and the heat exchange efficiency is improved more effectively.

In some embodiments, as shown in fig. 14, in order to reduce the transmission of the gaseous refrigerant to the bottom of the collecting pipe 1 'through the liquid discharge hole 31', a floating body 32 'is further disposed on the gas-liquid separation plate 3', and the floating body 32 'is used for switching the liquid discharge hole 31' by buoyancy. Specifically, in the flowing heat exchange process of the micro-channel heat exchanger, when the gaseous refrigerant exchanges heat to form a part of liquid refrigerant, the liquid refrigerant is collected into the collecting pipe 1 'and flows onto the gas-liquid separation plate 3' below under the action of gravity. The floating body 32' is immersed in the liquid refrigerant, and the floating body 32' floats away from the gas-liquid separation plate 3' by buoyancy to open the drain hole 31', so that the liquid refrigerant rapidly flows down from the drain hole 31'.

In order to prevent the floating body 32 'from moving freely on the gas-liquid separation plate 3', the floating body 32 'needs to be limited, and the gas-liquid separation plate 3' is further provided with a limiting mechanism for limiting the position of the floating body 32 'on the gas-liquid separation plate 3'.

The performance entity of the limiting mechanism can be a plurality of limiting plates 33', and the limiting plates 33' are distributed around the peripheral ring of the liquid discharge hole 31 'and fixed on the gas-liquid separation plate 3'; the distance between the upper ends of any two limiting plates 33 'is smaller than the external dimension of the floating body 32'. The upper end of the limit plate 33' can limit the floating body 32' from moving at any position of the gas-liquid separation plate 3', on one hand, the floating body 32' can limit the position between the plurality of limit plates 33' after floating due to the liquid refrigerant in the use process, and on the other hand, the floating body 32' is effectively limited by the plurality of limit plates 33' in the transportation process, so that the floating body 32' can move around the drain hole 31'.

And preferably, a groove 30 'is formed on the gas-liquid separation plate 3', a drain hole 31 'is opened at the bottom of the groove 30', and a float 32 'is positioned in the groove 30'. Specifically, after the floating body 32 'leaves the drain hole 31' due to buoyancy or sloshing, the floating body 32 'will be guided back to the drain hole 31' via the surface of the groove 30 'in a natural state to reliably shield the drain hole 31'.

In another embodiment, as shown in fig. 15, the gas-liquid separation plate 3' is provided with an elastic plate 34' for opening and closing the drain hole 31', and the elastic plate 34' can block the drain hole 31' by its own elastic force. One end of the elastic plate 34' is fixed to the lower surface of the gas-liquid separation plate 3', and the elastic plate 34' abuts against the lower surface of the gas-liquid separation plate 3' and covers the liquid discharge hole 31'. When a certain amount of liquid refrigerant is accumulated above the gas-liquid separation plate 3', the liquid refrigerant bends the elastic plate 34' downward by gravity to open the liquid discharge hole 31'.

In addition, the micro-channel heat exchanger is correspondingly provided with an air inlet 11 'and an liquid outlet 12' on the collecting pipe 1', according to design requirements, the air inlet 11' and the liquid outlet 12 'can be simultaneously arranged on the same collecting pipe 1', or an air inlet 11 'is arranged on one collecting pipe 1', and a liquid outlet 12 'is arranged on the other collecting pipe 1'. Since the gaseous refrigerant is introduced from the inlet port 11', a partition plate 13' is further provided in the header 1 'having the inlet port 11', and the partition plate 13 'is located between the inlet port 11' and the gas-liquid separation plate 3 'below the inlet port 11'. The partition plate 13' has a complete plate structure, and can block the gaseous refrigerant from flowing downward under the header 1', so as to ensure that the gaseous refrigerant entering from the gas inlet 11' enters the header 1' on the other side through heat exchange of the corresponding microchannel tubes 2'.

In the second embodiment, the heat pump unit is suspended and installed indoors, and the heat pump unit is usually installed in a bathroom in a user's home. In the actual installation and use process, the heat pump unit is fixed on an indoor roof in a hanging installation mode and is hidden on the suspended ceiling 1000. The water tank 200 is installed in a conventional manner in a user's home for use.

In order to provide the heating efficiency of the water tank more efficiently, the heat generated in the bathing process in the bathroom is fully utilized to heat the water in the water tank. The following design and modification are made to the heat pump unit 100, which will be described below with reference to the accompanying drawings.

As shown in fig. 3 to 12, the heat pump unit includes: base 1, compressor 2, evaporimeter 3, fan 4, automatically controlled board 5 and housing 7. Wherein, in order to meet the requirement of hanging installation, the base 1 is provided with an installation part 10 for hanging installation; an evaporator 3 and a fan 4 are arranged on the base 1, and the fan 4 is used for driving airflow to exchange heat through the evaporator 3. The housing 7 is arranged on the base 1 to form a shell, and a mounting cavity is formed between the housing 7 and the base 1.

Wherein, in order to realize that the heat of the air in the bathroom can be absorbed by evaporator 3 in order to improve heating efficiency, then be provided with first air intake 1001 and first air outlet 1002 on the base 1, first air intake 1001 and first air outlet 1002 communicate the installation cavity respectively, and first air intake 1001 is arranged in inhaling the air in the bathroom to the installation cavity, and the air is carried back to the bathroom via first air outlet 1002 after the heat transfer with evaporator 3. And the base 1 is further provided with a temperature sensor 10011 for detecting the temperature of the inlet air of the first air inlet 1001.

In the actual use process, when the temperature sensor detects that the air temperature is greater than the first set temperature value t1, under the action of the fan 4, the air in the bathroom flows into the housing through the first air inlet 1001, and the air is cooled by the evaporator 3 and then is conveyed back to the bathroom through the first air outlet 1002.

This allows the evaporator 3 to gain more heat due to the higher temperature of the air flowing into the enclosure from the bathroom. Compare in evaporimeter 3 and outdoor air carry out the heat transfer, the difference in temperature of refrigerant and the air of bathroom output is bigger in evaporimeter 3, and then can more effectual improvement heat exchange efficiency, realizes utilizing the waste heat or the used heat in bathroom in order to improve the energy efficiency effectively and reduce the energy consumption.

Meanwhile, in the bathing process of the user, the temperature in the bathroom is gradually increased along with the increase of the bathing time. Reduce the temperature in the bathroom through heat pump set for the inside and outside difference in temperature in bathroom diminishes, and then when the user walks out the bathroom, can not produce uncomfortable sense because of the difference in temperature is too big, with improvement user experience nature.

In another embodiment, in order to meet the requirement of the water tank in the heat pump water heater for heating water, the evaporator in the heat pump unit needs to exchange heat with outdoor air when the temperature of the bathroom exceeds a set value. Therefore, a second air inlet 1003 and a second air outlet 1004 are correspondingly arranged on the housing 7; the second air inlet 1003 and the second air outlet 1004 are respectively communicated with the installation cavity; the heat pump unit is also provided with an air door assembly 16, the air door assembly 16 is used for selectively opening and closing the first air inlet 1001, the first air outlet 1002, the second air inlet 1003 and the second air outlet 1004, and the air door assembly 16 is electrically connected with the electric control board 5.

In actual use, as for the air source for heat exchange of the evaporator 3, indoor air or outdoor air can be used, as described below with reference to the accompanying drawings.

1. Under the condition that indoor air is used as an air source for heat exchange of the evaporator 3, the fan 4 is used for driving air to enter the installation cavity through the first air inlet 1001 and to be output from the first air outlet 1002 after heat exchange of the evaporator 3. In actual use, after the heat pump unit is hung and installed, the first air inlet 1001 and the first air outlet 1002 are arranged on the base 1, so that air exchange can be directly performed with indoor air. Take installation of a heat pump unit in a bathroom as an example, wherein a ceiling buckle plate is not installed below the first air inlet 1001 and the first air outlet 1002 in the ceiling of the bathroom to expose the first air inlet 1001 and the first air outlet 1002. The exposed first air inlet 1001 and the exposed first air outlet 1002 can directly exchange air with the bathroom. The method specifically comprises the following steps: under the action of the fan 4, air in the bathroom enters the installation cavity formed by the heat pump unit through the first air inlet 1001, and the air is subjected to heat exchange through the evaporator 3 and then is output to the bathroom through the first air outlet 1002.

In some embodiments, the first inlet 1001 and the first outlet 1002 are disposed on the lower surface of the base 1, the first inlet 1001 is located on the air inlet side of the evaporator 3, and the first outlet 1002 is located on the air outlet side of the evaporator 3. The first air inlet 1001 and the first air outlet 1002 are directly arranged on the lower surface of the base 1, which is more favorable for smooth circulation of air between the installation cavity and the bathroom. To reduce the mutual influence of the air flows between the first air inlet 1001 and the first air outlet 1002, a recessed water-receiving tray 14 is formed on the base 1, and the water-receiving tray 14 is arranged between the first air inlet 1001 and the first air outlet 1002, so that the first air inlet 1001 and the first air outlet 1002 are separated by the water-receiving tray 14.

As a preferred embodiment, in order to improve the heat exchange efficiency of the evaporator 3, the heat pump unit further includes a wind scooper 8, the wind scooper 8 is disposed at the other end of the base 1, and the wind scooper 8 covers the air outlet side of the evaporator 3 and is used for guiding the airflow after heat exchange by the evaporator 3 to be output outwards. Specifically, under the action of the fan 4, outside air enters the installation cavity and exchanges heat with the evaporator 3, and air flow after heat exchange enters the air guide cover 8 so as to be output outwards through the air guide cover 8. And the wind scooper 8 is located the air-out side arrangement of evaporimeter 3, and the air current output to the outside of installation cavity after can leading the heat transfer better through wind scooper 8, and then avoids the air current after the heat transfer to continue to stay in the installation cavity and take place the phenomenon of repetition and evaporimeter 3 heat transfer, like this, can improve the heat exchange efficiency of evaporimeter 3 more high-efficiently.

The wind scooper 8 is arranged on the base 1 and positioned in the installation cavity, and the wind scooper 8 covers the air outlet side of the evaporator 3, so that an air outlet cavity is formed between the wind scooper 8 and the evaporator 3; the first air outlet 1002 is communicated with the air outlet cavity, and the first air inlet 1001 is communicated with the installation cavity.

2. Under the condition that outdoor air is adopted as an air source for heat exchange of the evaporator 3, the heat pump unit further comprises a vent pipe 9, the vent pipe 9 comprises an air inlet channel 91 and an air outlet channel 92, the air inlet channel 91 is communicated with a second air inlet 1003, the air outlet channel 92 is communicated with a second air outlet 1004, and free end parts of the air inlet channel 91 and the air outlet channel 92 are connected to the outside. Specifically, during actual installation, the air inlet channel 91 and the air outlet channel 92 are respectively communicated with the outdoor side, outdoor air enters the installation cavity through the air inlet channel 91, and the air exchanges heat with the evaporator 3 and is then output to the outdoor through the air outlet channel 92.

Similarly, since the air after heat exchange can be smoothly output to the outdoor through the air outlet channel 92 without being gathered in the installation cavity, the phenomenon that the air flow after heat exchange is continuously remained in the installation cavity to repeatedly exchange heat with the evaporator 3 is avoided, and thus, the heat exchange efficiency of the evaporator 3 can be improved more efficiently.

Meanwhile, in order to switch different air sources for heat exchange as required, the heat pump unit further comprises an air door assembly 16, and a first air inlet 1001, a first air outlet 1002, a second air inlet 1003 and a second air outlet 1004 are selectively switched through the air door assembly 16, so that indoor or outdoor air sources can be switched and used as required.

There are various forms of presentation entities for the damper assembly 16, such as: the air door assembly 16 may be air doors respectively disposed at the first air inlet 1001, the first air outlet 1002, the second air inlet 1003 and the second air outlet 1004, and the function of switching the use of indoor or outdoor air sources is realized by controlling the opening and closing of the air doors.

In a preferred embodiment, the damper assembly 16 includes: a first baffle 161 and a second baffle 162. The first baffle 161 is rotatably installed on the base 1 and is used for selectively blocking the first outlet 1002 or the second outlet 1004; the second shutter 162 is rotatably installed on the base 1 and is used for selectively blocking the first air inlet 1001 or the second air inlet 1003. Specifically, the first baffle 161 can rotate on the base 1 to switch and shield the first air outlet 1002 or the second air outlet 1004, so as to control the air after heat exchange to select the first air outlet 1002 or the second air outlet 1004 to the outside of the installation cavity. Likewise, the first inlet 1001 or the second inlet 1003 is selected to be opened by rotating the second shutter 162 to input indoor air or outdoor air into the housing.

By configuring the first baffle 161 and the second baffle 162, the air source can be conveniently and reliably switched by using a simple structure, so that the structural form of the air door assembly 16 is effectively simplified, the control process is more facilitated to be simplified, and the operation of the heat pump unit is more reliable.

In order to rotationally drive the first shutter 161 and the second shutter 162, a driving motor 163 may be disposed to rotationally drive the first shutter 161 and the second shutter 162.

In the third embodiment, the heat pump unit 100 is effectively reduced in overall height in order to meet the requirement of hanging hidden installation, so that the heat pump unit is hidden and installed in the ceiling. Wherein, in order to effectively reduce the overall height of the heat pump unit, the compressor 2 is transversely arranged and installed on the base 1; the fan 4 and the evaporator 3 are located on the same side of the compressor 2.

Specifically, a compressor 2 in the heat pump unit is transversely arranged and fixedly installed on a base 1. Therefore, the height space occupied by the compressor 2 can be effectively reduced, and the overall height of the heat pump unit can be effectively reduced. Meanwhile, the fan 4 and the evaporator 3 are located on the same side of the compressor 2, so that the fan 4 mainly blows or sucks air to the evaporator 3, the overall size of the fan 4 is reduced, and the increase of the height size of the heat pump unit caused by the fan 4 is avoided.

In some embodiments, to facilitate installation of the compressor 2, one end of the base 1 is provided with a mounting platform 11, and the compressor 2 is disposed on the mounting platform 11. Specifically, the compressor 2 is transversely installed and fixed on a mounting platform 11, and the mounting platform 11 is located at one end of the base 1, so that the compressor 2 is arranged at the corresponding end position of the base 1. Preferably, in order to reduce the effect of vibration generated by the operation of the compressor 2, a mounting bracket 12 is disposed on the mounting platform 11, a vibration damping pad 13 is disposed between the mounting bracket 12 and the mounting platform 11, and the compressor 2 is mounted on the mounting bracket 12.

For the mounting bracket 12, in order to cooperate with the damping pad 13 to achieve a better damping effect, two mounting brackets 12 arranged side by side are arranged on the mounting platform 11, the mounting bracket 12 has a fixing portion 121 and raised portions 122 distributed on two sides of the fixing portion 121, the fixing portion 121 is fixed on the mounting platform 11, and the damping pad 13 is arranged between the raised portions 122 and the mounting platform 11; in this case, the compressor 2 is fixed to the raised part 122. Specifically, the mounting bracket 12 is usually machined by sheet metal parts, and has certain elasticity, the compressor 2 is mounted on the tilting portion 122, and the bottom of the tilting portion 122 is pressed on the vibration reduction pad 13, so that the self elasticity of the mounting bracket 12 is utilized and the elasticity of the vibration reduction pad 13 is matched, and the effect of reducing vibration of the compressor 2 can be better achieved. Meanwhile, in a certain embodiment, in order to improve the structural strength of the base 1 for installing and fixing the compressor 2, the lower surface of the installation platform 11 is provided with a plurality of reinforcing ribs 111 arranged in a staggered manner.

In some embodiments, to facilitate installation of the evaporator 3 and to meet the overall height requirements of the apparatus, the other end of the base 1 forms a water-receiving tray 14, and the evaporator 3 is arranged above the water-receiving tray 14. Specifically, in actual use, the evaporator 3 is used for evaporation heat exchange, so that condensed water is generated on the surface of the evaporator 3, and the condensed water flows into the water pan 14 below the evaporator 3 under the action of gravity. The drain pipe 141 is disposed in the drain pan 14, and the drain pipe 141 drains to the outside. Wherein, form the water collector 14 of undercut on the base 1 to make evaporimeter 3 set up in water collector 14, like this, alright reduce the mounting height of evaporimeter 3 on base 1 more effectively, thereby can adopt bigger size evaporimeter 3 in order to improve heat exchange efficiency.

As a preferred embodiment, in order to effectively improve the heat exchanging capability of the evaporator 3 without increasing the height, the length of the heat exchange is larger than the height of the evaporator 3, so that the evaporators 3 are distributed along the length direction of the base 1, and the heat exchanging area of the evaporator 3 is increased by fully utilizing the length direction of the base 1.

In the fourth embodiment, since the heat pump unit is suspended and installed on the indoor roof, in order to facilitate later maintenance of the electric control device by an operator, for the base 1, the upper surface of the base 1 forms an upper installation surface, and the lower surface of the base 1 forms a lower installation surface. Wherein, the compressor 2, the evaporator 3 and the fan 4 are arranged on the upper mounting surface of the base 1; and as for the electric control board 5 for controlling the operation of the heat pump unit, the electric control board 5 is mounted on the lower mounting surface of the base 1.

After the heat pump unit is hung and installed, because the electric control board 5 is installed on the lower installation surface of the base 1, when the electric control board 5 needs to be maintained, the electric control board 5 only needs to be maintained by opening the hanging top at the lower part of the base 1. For the specific configuration of the electric control board 5, reference may be made to a control circuit board in a conventional heat pump unit, which is not limited or described herein.

As a preferred embodiment, a mounting groove 15 is formed on the lower mounting surface of the base 1, and the electric control board 5 is disposed in the mounting groove 15; the base 1 is further provided with a cover plate (not shown) for the switch mounting groove 15. Specifically, by forming the mounting groove 15 on the lower mounting surface of the base 1, the electronic control board 5 is mounted and fixed conveniently, so that the electronic control board 5 is embedded in the base 1. Meanwhile, the cover plate covers the mounting groove 15, and the electric control plate can be protected.

In some embodiments, the compressor 2 may be disposed at the upper portion of the mounting groove 15, so that the wiring between the electric control board 5 and the top compressor 2 is more convenient. And as for the reinforcing rib 111, the reinforcing rib is formed in the mounting groove 15, the electric control board 5 is supported by the reinforcing rib 111, on one hand, the electric control board 5 is conveniently fixed on the reinforcing rib 111 through screws, on the other hand, the reinforcing rib 111 supports the electric control board 5, and the reinforcing rib 111 is also beneficial to the heat released by the electric control board 5 so as to ensure the reliable operation of the electric control board.

In the fifth embodiment, because the heat pump unit needs to be hung on an indoor roof, and in the operation process of the heat pump unit, the vibration generated by the compressor 2 or the fan 4 is easily transmitted to a roof wall to cause serious noise, in order to solve the above problems, the base 1 is hung on the indoor roof through the suspension rod 6, and the suspension rod 6 is connected with the mounting part 10; an elastic damper 60 is provided between the lower end of the suspension lever 6 and the mounting portion 10.

Specifically, after the heat pump unit is suspended on the roof through the suspension rod 6, the elastic damping member 60 is sandwiched between the lower end of the suspension rod 6 and the mounting portion 10. Like this, at the heat pump set operation in-process, the vibration that compressor 2 or fan 4 produced is mostly absorbed by elastic damping piece 60 to reduce or avoid the vibration to transmit the roof via hanging pole 6, and then reduce the vibration and the noise influence that the heat pump set vibration caused indoor building, with improvement user experience nature. The body of the elastic damping member 60 may be a spring fitted over the suspension rod 6; alternatively, the elastic damping member 60 may be a rubber sleeve fitted over the suspension rod 6.

The representation entity of the mounting portion 10 may be in the form of a lifting lug, so that an insertion hole (not labeled) is formed at the upper portion of the mounting portion 10, and the lower end portion of the suspension rod 6 is inserted into the insertion hole. Specifically, a plurality of mounting portions 10 may be disposed on the periphery of the base 1 as needed, and in fig. 3, the mounting portions 10 are disposed at four corners of the base 1, respectively, the lower end portion of the suspension rod 6 is inserted into the insertion hole to hang the base 1, and the upper end portion of the suspension rod 6 is fixedly mounted on the roof.

In addition, an upper flanging structure (not labeled) is arranged on the upper part of the mounting part 10, and the insertion holes are formed on the upper flanging structure. The mounting portion 10 can be abutted against the elastic vibration-damping member 60 by the upturned structure to increase the contact area for more stable and reliable mounting.

In one embodiment, the lower part of the suspension rod 6 is provided with a thread, the lower part of the suspension rod 6 is connected with an adjusting nut 61 in a threaded manner, the adjusting nut 61 is positioned below the upper flanging structure, and the elastic damping piece 60 is clamped between the adjusting nut 61 and the upper flanging structure. In the actual installation process, the height position of the adjusting nut 61 on the suspension rod 6 is adjusted by rotating the adjusting nut to adjust the installation position of the base 1, so that the operator can conveniently and efficiently install and adjust the suspension rod on site.

In some embodiments, a thread may be further provided on the upper portion of the suspension rod 6, and the upper portion of the suspension rod 6 is connected with a fastening nut 62 through the thread; the upper end of the suspension rod 6 forms a taper bolt, an expansion pipe 63 is sleeved on the suspension rod 6, and the expansion pipe 63 is positioned above the fastening nut 62. Specifically, the upper end part of the suspension rod 6, the fastening nut 62 and the expansion pipe 63 form an expansion bolt structure, so that the suspension rod 6 can be directly and fixedly installed in the concrete of a roof without additionally using other installation functional parts, the installation process is simplified, and the installation cost is reduced.

In the sixth embodiment, in order to reduce the adverse effect of the noise generated by the operation of the compressor 2 and the fan 4 on the user. The housing 7 is a housing having a sound insulating function, and the housing 7 is mounted on the base 1 and covers the compressor 2, the evaporator 3, and the fan 4. An installation cavity is formed between the housing 7 and the base 1, and the compressor 2, the evaporator 3 and the fan 4 are all positioned in the relatively closed installation cavity. In this way, the noise generated during the operation of the compressor 2 and the fan 4 is effectively limited by the casing 7 to be transmitted to the outside, so as to reduce the operation noise. For example: soundproof cotton may be provided in the housing 7 to perform a better soundproof function.

As a preferred embodiment, since the noise generated during the operation of the compressor 2 is greater, an auxiliary soundproof cover 21 is further provided in the installation cavity to cover the compressor 2. Specifically, the auxiliary soundproof cover 21 is covered in the housing 7, and the noise generated by the compressor 2 is first subjected to soundproof treatment by the auxiliary soundproof cover 21, and then further subjected to soundproof treatment by the housing 7, so as to reduce the influence of the noise on the user to the maximum extent.

In some embodiments, a recess 71 extending towards the base 1 is provided on the casing 7, the compressor 2 is located on one side of the recess 71, and the evaporator 3 and the fan 4 are located on the other side of the recess 71. Specifically, the recessed structure 71 makes the area of the enclosure 7 wrapping the auxiliary soundproof cover 21 larger, and is more favorable for playing the effects of sound insulation and noise reduction. Moreover, the compressor 2 can be separated from the evaporator 3 and the fan 4 by the concave structure 71, so that the air flow generated by the fan 4 can more effectively carry out heat exchange treatment on the evaporator 3, and the end part of the base 1 for installing the compressor 2 is reduced, so that the heat exchange efficiency of the air flow is improved.

Seventh embodiment, based on the above technical solution, optionally, for the installation position of the fan 4, the fan 4 may be arranged on the air inlet side of the evaporator 3 or the air outlet side of the evaporator 3 as required. And the specific type of the fan 4 is described below with reference to the accompanying drawings.

In some embodiments, as shown in fig. 4, the fan 4 may be a cross-flow fan, and a cross-flow wind wheel of the cross-flow fan is disposed in the air outlet cavity. In order to meet the installation requirement of the cross-flow fan, the air guide cover 8 arranged on the base 1 is correspondingly improved, namely, shaft holes (not marked) are arranged at two end parts of the air guide cover 8, and a rotating shaft of the cross-flow wind wheel is rotatably arranged in the shaft holes; and a cross flow motor (not marked) is further arranged at one end of the air guide cover 8 and is connected with a rotating shaft of the cross flow wind wheel.

And in the in-service use in-process, because heat pump set hangs and installs on indoor roof, when fan 4 broke down and need maintain, in order to reduce the maintenance degree of difficulty, then wind scooper 8 adopts the components of a whole that can function independently structure, includes promptly: the mask comprises a first mask body 81 and a second mask body 82, wherein two ends of the first mask body 81 are respectively provided with a first semicircular notch 810, and two ends of the second mask body 82 are respectively provided with a second semicircular notch 820; the first semicircular notch 810 and the second semicircular notch 820 located at the same end are butted together to form the shaft hole. In the stage of assembling in a factory, the cross-flow wind wheel is disposed between the first cover 81 and the second cover 82, and then the first cover 81 and the second cover 82 are assembled together, so that the fan 4 can be assembled. And when the cross-flow wind wheel is maintained at a later stage, the cross-flow wind wheel can be taken out for maintenance and replacement only by detaching the first cover body 81 and the second cover body 82.

As for the first cover 81, it includes: the air guide plate comprises two first end plates 811 and an air guide plate 812, wherein a first semicircular notch 810 is formed in the edge of each first end plate 811, and the air guide plate 812 is of an arc-shaped plate structure and is arranged between the two first end plates 811; and the second cover 82 includes: two second end plates 821 and a connecting piece 822, wherein the edge of the first end plate 811 is provided with a second semicircular notch 820, and the connecting piece 822 is arranged between the two second end plates 821; wherein the first end plate 811 and the second end plate 821 at the same end are connected together; in addition, the second end plate 821 abuts on the end of the evaporator 3, and the air deflector 812 abuts on the upper edge of the evaporator 3. Specifically, the outer surface of the air guiding plate 812 forms the air guiding surface 80 to guide the external air to the evaporator 3.

In order to facilitate an operator to rapidly assemble the first cover 81 and the second cover 82 together, the edge of the first end plate 811 is provided with the positioning plate 8111 extending outward, the edge of the second end portion is provided with the positioning slot 8121, and the positioning plate 8111 is inserted into the positioning slot 8121, so that the first cover 81 and the second cover 82 can be pre-assembled and positioned by the positioning plate 8111 and the positioning slot 8121 being matched with each other.

Meanwhile, a positioning protrusion 8112 is disposed at an edge of the first end plate 811, a positioning notch 8212 is disposed at an edge of the first end plate 811, and the positioning protrusion 8112 is disposed in the positioning notch 8212. The positioning convex blocks 8112 are located below the positioning plate 8111 and distributed on two sides of the first semicircular notch 810, when the positioning cover is assembled, the second cover body 82 is hung on the first cover body 81 through the matching of the positioning clamping grooves 8121 and the positioning plate 8111, then the lower portion is positioned through the matching of the positioning convex blocks 8112 and the positioning notch 8212, and finally the first cover body 81 and the second cover body 82 are connected and fixed through screws. The first cover 81 and the second cover 82 can be assembled only by arranging screws on two sides of the first cover and the second cover respectively, and therefore the assembling efficiency is improved.

More importantly, because positioning channel 8121 and locating plate 8111 cooperation can provide the structure spacing on the upper portion in shaft hole to the installation fan 4 that first semicircle breach 810 and second semicircle breach 820 can be more reliable is ensured to the bottom sprag that carries out with location breach 8212 of cooperation bottom.

In some embodiments, the connector 822 may be a connecting plate, which abuts against the upper edge of the water pan 14, and the air tightness of the air outlet cavity is enhanced by the connecting plate matching with the edge of the water pan 14. Preferably, the section of the connecting plate is of an inverted U-shaped structure, so as to effectively increase the contact area between the connecting plate and the upper edge of the water pan 14,

in other embodiments, as shown in fig. 5, the fan 4 may be an axial flow fan, and in order to ensure that the fan 4 can generate sufficient air volume to exchange heat with the evaporator 3 under the condition of using the axial flow fan, a plurality of axial flow fans may be sequentially arranged along the length direction of the evaporator 3, so as to meet the requirement of air volume on one hand and meet the requirement of height design on the other hand. Preferably, the axial fan abuts against the air intake side of the evaporator 3.

Based on the above technical solution, optionally, the heat pump unit provided by the present invention may further add related components to expand the functions thereof, for example: when the heat pump unit is installed in a bathroom, the function of the bathroom heater can be integrated in the heat pump unit. The method specifically comprises the following steps: the heat pump set still includes: the electric heater 31, the electric heater 31 is used for heating the airflow flowing to the first air outlet 1002; correspondingly, the first air outlet 1002 is arranged on the lower surface of the base 1 to realize air outlet to the indoor. Specifically, when the user bathes, the compressor 2 stops operating, and the electric heater 31 and the fan 4 are powered on to operate, so that heated air enters the room through the first air outlet 1002, and the function of heating the bathroom heater is realized.

Wherein, the first air outlet 1002 is located at the air outlet side of the evaporator 3, and the electric heater 31 is also arranged at the air outlet side of the evaporator 3 and above the first air outlet 1002. Thus, the air is heated by the electric heater 31 and then output from the first outlet 1002 below. In addition, in the case where the air guiding cover 8 is disposed, it is preferable that the electric heater 31 is disposed in the air outlet chamber so as to efficiently heat air by using a space relatively closed by the air outlet chamber, thereby improving heating efficiency.

In some embodiments, the electric heater 31 may be mounted on the evaporator 3 for ease of assembly. Correspondingly, the evaporator 3 is provided with a mounting seat 32, the electric heater 31 is provided with the mounting seat 32, and the mounting seat 32 can be fixed on the tube plate of the evaporator 3 through screws, so that the electric heater 31 can be conveniently and reliably mounted and fixed through the mounting seat 32. In order to accurately control the heating temperature, a temperature controller 33 for detecting the heating temperature of the electric heater 31 is further arranged on the mounting seat, and the temperature controller 33 can detect the heating temperature of the electric heater 31.

For the representation entity of the electric heater 31, the electric heater 31 may include a plurality of electric heating sheets, and a heating area is formed between two adjacent electric heating sheets. Alternatively, the electric heater 31 is an electric heating tube.

In some embodiments, in order to further enrich the use function, the lower surface of the base 1 is further provided with an illumination lamp (not shown). The illuminating lamp can be arranged on the lower surface of the base 1 and positioned in the area below the water pan 14 so as to meet the requirement of indoor illumination.

In a ninth embodiment, as shown in fig. 16, a specific control method of a heat pump water heater includes:

step S101, judging whether hot water flows out of the water tank or not through a water flow sensor and whether the time for the hot water to continuously flow out is longer than a first set time length T1 or not so as to judge whether a user starts bathing or not through the step S101.

After it is detected that the time for which the hot water continuously flows out is greater than the first set time period T1 through step S101, it is determined that the user starts bathing. Step S102 is executed to start the blower in the heat pump unit. Specifically, under the action of the fan, air in the bathroom circularly flows into the shell of the heat pump unit.

And the shell is also provided with a temperature sensor for detecting the temperature of the inlet air of the first air inlet, and the air flows into the shell after the step S102. Step S103 is executed, the temperature of the air entering the shell through the first air inlet is detected through the temperature sensor, and after the detected inlet air temperature is higher than a first set temperature value t1, it is judged that the temperature in the bathroom is too high and cooling treatment is needed.

After it is determined in step S103 that the temperature lowering process is necessary, step S104 is executed to start the compressor. Specifically, after the compressor is started, the evaporator in the shell is in a refrigerating state, the evaporator can absorb heat of air output by the bathroom to cool, on one hand, cold air formed after air heat exchange is output to the bathroom to adjust the temperature, and on the other hand, water in the water tank can be heated by fully utilizing the heat of the air in the bathroom.

Further, in the bathing process, after the heat pump unit is started, the bathroom can be gradually cooled, and in order to avoid the temperature cooling of the bathroom to be too low, the control method further comprises the following steps: s105, detecting the inlet air temperature through a temperature sensor in the bathing process of a user, and judging whether the inlet air temperature is smaller than a second set temperature value t2; wherein t1 is greater than t2. Specifically, in the user's bathing process, heat pump set starts the back, can continuously carry out the operation of refrigerating to the air in the bathroom, when temperature sensor detected that the inlet air temperature is less than second settlement temperature value t2, then need stop to carry out the operation of refrigerating to the air in bathroom to avoid the bathroom temperature cooling to hang down excessively and influence user experience nature.

And step S105, executing step 106 and shutting down the compressor after detecting that the inlet air temperature is lower than a second set temperature value t2. Specifically, after the compressor is shut down, the evaporator will pause the cooling operation of the air entering the enclosure, thus preventing the bathroom from being cooled further. And as the user continuously uses the hot water, the temperature of the bathroom gradually rises, and when the temperature detected by the temperature sensor exceeds the first set temperature value t1 again, the compressor is started again.

In a preferred embodiment, after the user has bathed, the temperature in the bathroom remains high compared to the temperature in the other rooms, and the heat of the air in the bathroom can be further utilized to heat the water in the water tank. Therefore, the control method further comprises the step S107 that after the water flow sensor detects that no water flows, whether the duration time of the no water flow is longer than a second set time length T2 or not is judged so as to judge whether the user finishes bathing or not.

And after the user finishes bathing through the step S107, executing a step S108, and turning off the fan and the compressor. Specifically, after a user bathes, the time length T2 after water cut-off is utilized, so that the heat pump unit can fully utilize the air waste heat in the bathroom to heat the evaporator, the heat exchange efficiency of the evaporator is improved, and the water in the water tank is heated by fully utilizing the waste heat in the bathroom. Meanwhile, after bathing, the temperature in the bathroom is gradually reduced under the action of the operation of the heat pump unit, so that the temperature difference between the inside and the outside of the bathroom is reduced. Therefore, after the user leaves the bathroom, the uncomfortable degree of the user body feeling caused by the overlarge temperature difference can be effectively reduced.

In a preferred embodiment, in order to more fully utilize the residual heat in the bath chamber, the control method specifically comprises: after the water flow sensor detects that no water flows and the duration time is longer than a second set time length T2, if the temperature detected by the temperature sensor is longer than a second set temperature value T2, the compressor and the fan continue to operate. After the user bathes completely through step S107, if the temperature detected by the temperature sensor is greater than the second set temperature value t2, the operation time of the heat pump unit can be prolonged, so as to fully utilize the air residual heat in the bathroom. And when the temperature sensor detects that the temperature is less than or equal to a second set temperature value t2, the compressor and the fan are shut down.

In a preferred embodiment, in winter conditions, there is usually central heating in the room, and after the user falls asleep at night, the user will not use the room for other rooms than the lying room. Taking a bathroom as an example, if a user sets a time period from 10 pm to 5 am as a set time period, the heat pump water heater starts the heat pump unit in the set time period, the fan sucks air in the bathroom into the shell through the first air inlet, and the air exchanges heat with the evaporator and then is conveyed to the bathroom through the first air outlet, so that water in the water tank is heated by indoor heat.

As shown in fig. 17, the control method specifically includes:

step S201, in a set time period, the fan is started first.

Step S202, the temperature of the air entering the shell through the first air inlet is detected through the temperature sensor, and after the temperature of the inlet air is detected to be larger than a third set temperature value t3, the waste heat utilization can be judged.

Step 203, starting the compressor. Specifically, after the compressor is started, the evaporator exchanges heat with hot air output from the bathroom so as to efficiently heat water in the water tank by using heat in the bathroom.

In another embodiment, after the heat pump unit is started, the temperature of the bathroom will gradually decrease, and the control method further includes:

step 204, after the compressor is started, detecting the inlet air temperature through a temperature sensor, and judging whether the inlet air temperature is less than a fourth set temperature value t4; wherein t3 is greater than t4. After the heat pump set started, the operation of refrigerating can be continuously carried out to the air in the bathroom, when temperature sensor detected that the inlet air temperature was less than fourth settlement temperature value t4, then need stop to carry out the operation of refrigerating to the air in bathroom to avoid the bathroom temperature cooling to hang down excessively.

After the intake air temperature is detected to be lower than the fourth set temperature value t4 through step S204, step S205 is executed to shut down the compressor. Specifically, after the compressor is shut down, the evaporator will pause the cooling operation of the air entering the enclosure, thus preventing the bathroom from being cooled further. Under the action of central heating, the temperature in the bathroom will gradually rise. In the process of compressor shutdown, the fan is still in continuous operation or intermittent operation to make temperature sensor detect the inlet air temperature. And when the temperature detected by the temperature sensor exceeds the third set temperature value t3 again, the compressor is started again.

In another embodiment, the control method may further include: and step S206, if the water temperature in the water tank reaches the set water temperature value within the set time period, executing step S207, and shutting down the fan and the compressor.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims (6)

1. A heat pump water heater, comprising:

the heat pump unit comprises a shell, and a compressor, an evaporator, a fan, a throttling device and an electric heater which are arranged in the shell;

the water tank comprises a tank shell, and an inner container and a condenser which are arranged in the tank shell, and the compressor, the evaporator, the throttling device and the condenser are connected to form a refrigerant circulation flow path;

wherein, the condenser includes: the micro-channel pipes are connected between the two collecting pipes and attached to the outer wall of the liner, at least one gas-liquid separation plate is arranged in each collecting pipe, and a liquid discharge hole is formed in each gas-liquid separation plate;

in addition, the shell comprises a base and a cover shell, wherein the base is provided with an installation part for hanging installation, the base is also provided with a first air inlet and a first air outlet, the cover shell is arranged on the base, an installation cavity is formed between the cover shell and the base, and the compressor, the evaporator and the fan are arranged on the base; a second air inlet and a second air outlet are formed in the housing; the heat pump unit further comprises a wind scooper and a wind door assembly, the wind scooper is arranged on the base and located in the installation cavity, the wind scooper covers the air outlet side of the evaporator, and an air outlet cavity is formed between the wind scooper and the evaporator; the first air outlet and the second air outlet are respectively communicated with the air outlet cavity, the first air inlet and the second air inlet are respectively communicated with the mounting cavity, and the electric heater is positioned on the air outlet side of the evaporator;

the damper assembly includes: the first baffle plate is rotatably arranged on the base and is used for selectively shielding the first air outlet or the second air outlet; the second baffle is rotatably installed on the base and used for selectively shielding the first air inlet or the second air inlet.

2. The heat pump water heater according to claim 1, wherein a float is further provided on the gas-liquid separation plate, and the float is configured to open and close the drain hole by using buoyancy.

3. The heat pump water heater according to claim 2, wherein a groove is formed on the gas-liquid separation plate, the drain hole is formed at the bottom of the groove, and the floating body is located in the groove.

4. The heat pump water heater according to claim 1, wherein the gas-liquid separation plate is provided with an elastic plate for opening and closing the drain hole, one end of the elastic plate is fixed to the lower surface of the gas-liquid separation plate, and the elastic plate abuts against the lower surface of the gas-liquid separation plate and covers the drain hole.

5. The heat pump water heater of claim 1, wherein the heat pump unit further comprises:

and the temperature sensor is arranged on the shell and is used for detecting the air inlet temperature of the first air inlet.

6. A control method of the heat pump water heater according to any one of claims 1 to 5, comprising: when the temperature sensor detects that the inlet air temperature of the first air inlet is higher than a set temperature value, starting the fan and the compressor; indoor air enters the installation cavity through the first air inlet, exchanges heat with the evaporator and then is conveyed back to the room through the first air outlet.

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