Heat pump outdoor unit, heat pump system and control method of heat pump outdoor unit

Abstract

The invention discloses a heat pump outdoor unit, a heat pump system and a control method of the heat pump outdoor unit, and relates to the technical field of heating and ventilation equipment, the heat pump outdoor unit comprises an outdoor unit shell, a heating assembly and a heat exchange exhaust assembly, the outdoor unit shell is provided with an air inlet and an air outlet, the air outlet comprises a first air outlet, a first air outlet grille is arranged at the first air outlet, and a second air outlet grille is arranged at the second air outlet; the outdoor unit shell comprises an air outlet face frame, the first air outlet is formed in the top of the air outlet face frame, the heating assembly comprises a heating piece, the heating piece is arranged on the first air outlet grille, and the heat exchange air exhaust assembly is arranged in the outdoor unit shell. According to the heat pump outdoor unit disclosed by the embodiment of the invention, the first air outlet grating is arranged at the first air outlet in the top, and the first air outlet grating can reduce external foreign matters entering the outdoor unit shell through the first air outlet; moreover, the heating assembly is arranged on the first air outlet grid, ice and snow on the first air outlet grid are melted, and the ice and snow are prevented from blocking the first air outlet.

Description

Technical Field

[0001] The present invention relates to the technical field of heating and ventilation equipment, and in particular to a heat pump outdoor unit, a heat pump system and a control method for the heat pump outdoor unit. Background Art

[0002] In related technologies, heat pump outdoor units are located outdoors. In cold weather (e.g., below 0°C) or during snowy weather, the air outlets of the heat pump outdoor units may become blocked by ice and snow. The air outlets located at the top of the housing are particularly susceptible to ice and snow accumulation, leading to blockage. This reduces the actual air outlet area of the heat pump outdoor unit or even prevents it from discharging properly. Therefore, improvements are needed. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide a heat pump outdoor unit, wherein a first air outlet grille is provided at a first air outlet located at the top to reduce the amount of foreign matter that enters the outdoor unit casing through the first air outlet; and a heating component is provided at the first air outlet grille, so that the heating component heats the first air outlet grille to melt ice and snow on the first air outlet grille, thereby preventing ice and snow from clogging the first air outlet, thereby reducing the actual air outlet area of the heat pump outdoor unit or preventing normal air outlet.

[0004] The present invention also provides a heat pump system including the above-mentioned heat pump outdoor unit.

[0005] The present invention also proposes a control method for the heat pump outdoor unit.

[0006] According to the first embodiment of the present invention, the heat pump outdoor unit includes: an outdoor casing, the outdoor casing includes a casing body, a front partition and an air outlet frame, the air outlet frame is arranged on the front side of the casing body, the front partition is arranged between the casing body and the air outlet frame, the casing body and the front partition jointly define an installation cavity, the air outlet frame and the front partition jointly define an air outlet cavity, an air flow outlet is provided on the front partition, the air flow outlet connects the air outlet cavity and the installation cavity, the casing body is provided with an air inlet connected to the installation cavity, the air outlet frame is provided with the air outlet connected to the outlet cavity, the air outlet frame includes a frame top located at the top, the air outlet includes a first air outlet arranged at the frame top, and a first air outlet grille is provided at the first air outlet; a heating assembly includes a heating element, and the heating element is arranged at the first air outlet grille; a heat exchange and exhaust assembly is arranged in the installation cavity.

[0007] According to the heat pump outdoor unit of the embodiment of the present invention, an air outlet frame is provided on the front side of the casing main body, the casing main body and the front partition jointly define the installation cavity, and the air outlet frame and the front partition jointly define the air outlet cavity. When the heat pump outdoor unit is working, the airflow discharged from the heat exchange and exhaust assembly in the installation cavity is not discharged directly to the outside, but is discharged into the air outlet cavity through the first air outlet. The buffering effect of the air outlet cavity can reduce the flow rate and impact force of the air outlet airflow, and the air outlet airflow buffered by the air outlet cavity is discharged to the outside through the air outlet, which can reduce the discomfort caused by the impact of the air outlet airflow on the human body. In addition, by A first air outlet grille is provided at the first air outlet on the top. The first air outlet grille can block debris in the outdoor environment, reduce the amount of external foreign matter entering the outdoor casing through the first air outlet, and reduce the problem of debris entering the outdoor casing through the first air outlet and affecting the components inside the outdoor casing; by providing a heating component at the first air outlet grille, the heating component can heat the first air outlet grille, increase the temperature of the first air outlet grille, melt the ice and snow on the first air outlet grille, and avoid the problem that ice and snow block the first air outlet, resulting in a reduction in the actual air outlet area of the heat pump outdoor unit or failure to discharge air normally.

[0008] According to some embodiments of the present invention, the first air outlet grille is detachably connected to the outdoor casing.

[0009] According to some embodiments of the present invention, the heating element is disposed on an inner side of the first air outlet grille.

[0010] According to some embodiments of the present invention, the heating element is embedded in the first air outlet grille.

[0011] According to some embodiments of the present invention, the first air outlet grille is integrally injection-molded with the heating element.

[0012] According to some embodiments of the present invention, the heating element is detachably mounted on the first air outlet grille.

[0013] According to some embodiments of the present invention, the heating element is snap-connected to the first air outlet grille.

[0014] According to some embodiments of the present invention, the first air outlet grille includes a grille body and a limiting structure, the limiting structure is arranged on the inner side of the first air outlet grille, the limiting structure is provided with a limiting hole, and the heating element is passed through the limiting hole.

[0015] According to some embodiments of the present invention, the heating element is an electric heating element.

[0016] According to some embodiments of the present invention, the heat pump outdoor unit includes a temperature detection component, which is used to detect the ambient temperature or the temperature of the outdoor heat exchanger. The temperature detection component and the heating component are both electrically connected to the controller of the heat pump outdoor unit.

[0017] According to some embodiments of the present invention, at least a portion of the upper surface of the first air outlet grille constitutes a guide surface, and the guide surface extends obliquely downward.

[0018] According to some embodiments of the present invention, the angle between the guide surface and the horizontal plane is α, 0°<α≤15°.

[0019] According to some embodiments of the present invention, the guide surface extends obliquely downward in the front-rear direction.

[0020] According to some embodiments of the present invention, the guide surface extends obliquely downward in a direction from rear to front.

[0021] According to some embodiments of the present invention, the outdoor casing includes a middle partition, which is arranged in the casing main body to separate the installation cavity into a first installation cavity and a second installation cavity arranged along the left and right directions. The heat exchange and exhaust assembly includes an outdoor heat exchanger, an outdoor fan and a compressor. The outdoor heat exchanger and the outdoor fan are arranged in the first installation cavity, the compressor is arranged in the second installation cavity, and the air inlet and the air outlet cavity are both connected to the first installation cavity.

[0022] According to some embodiments of the present invention, the air outlet frame is detachably connected to the casing body.

[0023] According to some embodiments of the present invention, the air outlet frame includes a frame portion and a front panel, the frame portion includes the frame top located at the top, the frame portion is annular, the front panel cover is arranged on the front side of the frame portion, the frame portion is connected between the front panel and the casing body, and the air outlet is formed in the frame portion.

[0024] According to some embodiments of the present invention, the frame portion includes a frame bottom located at the bottom, the air outlet includes a second air outlet, the second air outlet is arranged at the frame bottom, and at least a portion of the second air outlet constitutes a drain outlet.

[0025] According to some embodiments of the present invention, the frame portion includes a frame bottom and a frame side portion, the frame top portion is located at the top of the frame portion, the frame bottom portion is located at the bottom of the frame portion, the frame side portion is connected to the left and right sides of the frame top portion and the frame bottom portion, and the air outlet includes a third air outlet, and the third air outlet is arranged on the frame side portion.

[0026] A heat pump system according to an embodiment of a second aspect of the present invention includes: an air conditioner indoor unit; and a heat pump outdoor unit according to an embodiment of the first aspect of the present invention.

[0027] According to an embodiment of the present invention, the heat pump system includes a heat pump outdoor unit according to the first embodiment of the present invention, thereby reducing the problem of debris entering the interior of the outdoor casing through the first air outlet located at the top and affecting the components inside the outdoor casing; and avoiding ice and snow blocking the first air outlet, resulting in a reduction in the actual air outlet area of the heat pump outdoor unit or failure to discharge air normally.

[0028] According to the control method of the heat pump outdoor unit of the third aspect embodiment of the present invention, the heat pump outdoor unit is the heat pump outdoor unit of the first aspect embodiment of the present invention, and the control method of the heat pump outdoor unit includes: detecting the ambient temperature or the temperature of the outdoor heat exchanger; controlling the heating component according to the ambient temperature or the temperature of the outdoor heat exchanger; turning on the heating component when the ambient temperature is lower than a first preset temperature or the outdoor heat exchanger temperature is lower than a second preset temperature.

[0029] According to the control method of the heat pump outdoor unit in an embodiment of the present invention, by controlling the heating component according to the ambient temperature or the temperature of the outdoor heat exchanger, the heating component can heat the first air outlet grille to prevent ice and snow from blocking the first air outlet, resulting in a reduction in the actual air outlet area of the heat pump outdoor unit or failure to discharge air normally.

[0030] According to some embodiments of the present invention, the heat pump outdoor unit has a defrost mode. In the defrost mode, the outdoor heat exchanger serves as a condenser. The control method of the heat pump outdoor unit includes: turning off the heating component in the defrost mode.

[0031] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which: Figure 1 is a schematic perspective view of a heat pump outdoor unit according to some embodiments of the present invention; Figure 2 yes Figure 1 A three-dimensional schematic diagram of the heat pump outdoor unit from another angle; Figure 3 yes Figure 1 Exploded diagram of the heat pump outdoor unit; Figure 4 yes Figure 3 A three-dimensional schematic diagram of the air outlet frame; Figure 5yes Figure 4 Enlarged view of point B in the middle; Figure 6 yes Figure 4 A cross-sectional view of the air outlet frame in FIG. Figure 7 yes Figure 6 Enlarged view of point A in the middle; Figure 8 yes Figure 3 A three-dimensional schematic diagram of a part of the structure of the heat pump outdoor unit.

[0033] Reference numerals: 100. Heat pump outdoor unit; 1. Outdoor housing; 11. Air inlet; 12. Air outlet; 121. First air outlet; 122. Second air outlet; 123. Third air outlet; 13. Drain outlet; 14. First air outlet grille; 141. Grille body; 142. Limiting structure; 143. Limiting hole; 144. First surface; 1441. Guide surface; 145. Second surface; 15. Second air outlet grille; 16. Third air outlet grille; 17. Casing body; 171. Middle partition; 172. Mounting cavity; 1721. First mounting cavity; 1722. Second mounting cavity; 173. Front partition; 174. Airflow outlet; 18. Air outlet frame; 181. Frame portion; 1811. Frame top; 1812. Frame bottom; 1813. Frame side; 182. Front panel; 19. Air outlet grille; 2. Heating assembly; 21. Heating element; 3. Heat exchange and exhaust components; 31. Outdoor fan. DETAILED DESCRIPTION

[0034] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0035] Reference below Figures 1-8 A heat pump outdoor unit 100 according to an embodiment of the present invention will be described.

[0036] The heat pump outdoor unit 100 according to the first embodiment of the present invention includes: an outdoor casing 1, a heating component 2 and a heat exchange and exhaust component 3.

[0037] The outdoor housing 1 is provided with an air inlet 11 and an air outlet 12, and the heat exchange and exhaust assembly 3 is disposed within the outdoor housing 1. When the heat pump outdoor unit 100 is operating, air flows into the heat pump outdoor unit 100 through the air inlet 11, undergoes heat exchange through the heat exchange and exhaust assembly 3, and finally exits the outdoor housing 1 through the air outlet 12. For example, the air inlet 11 may be located at the rear of the outdoor housing 1, and the air outlet 12 may be located at the front of the outdoor housing 1.

[0038] The air outlet 12 includes a first air outlet 121, and a first air outlet grille 14 is provided at the first air outlet 121. By providing the first air outlet grille 14 at the first air outlet 121, the first air outlet grille 14 can block debris in the outdoor environment, thereby reducing the problem of debris entering the interior of the outdoor housing 1 through the first air outlet 121 and affecting the internal components of the outdoor housing 1.

[0039] The heating assembly 2 includes a heating element 21, which is disposed on the first air outlet grille 14. By including the heating element 21 in the heating assembly 2 and disposing the heating element 21 on the first air outlet grille 14, the heating element 21 can heat the first air outlet grille 14, raising the temperature of the first air outlet grille 14 and melting ice and snow on the first air outlet grille 14, thereby preventing ice and snow from clogging the first air outlet 121, thereby reducing the actual air outlet area of the heat pump outdoor unit 100 or preventing normal air outlet.

[0040] According to the heat pump outdoor unit 100 of an embodiment of the present invention, a first air outlet grille 14 is provided at the first air outlet 121. The first air outlet grille 14 can block debris in the outdoor environment, reduce external foreign matter from entering the outdoor casing 1 through the first air outlet 121, and reduce the problem of debris entering the interior of the outdoor casing 1 through the first air outlet 121 and affecting the internal components of the outdoor casing 1; by providing a heating component 2 at the first air outlet grille 14, the heating element 21 can heat the first air outlet grille 14, increase the temperature of the first air outlet grille 14, melt the ice and snow on the first air outlet grille 14, and avoid the problem that ice and snow block the first air outlet 121, resulting in a reduction in the actual air outlet area of the heat pump outdoor unit 100 or failure to discharge air normally.

[0041] According to some embodiments of the present invention, the first air outlet grille 14 is detachably connected to the outdoor housing 1. By making the first air outlet grille 14 detachably connected to the outdoor housing 1, it is convenient to clean or replace the first air outlet grille 14. For example, the first air outlet grille 14 can be snap-fitted to the outdoor housing 1.

[0042] According to some embodiments of the present invention, referring to Figure 7, the heating element 21 is arranged on the inner side of the first air outlet grille 14. Since the heat pump outdoor unit 100 is located in an outdoor environment, foreign matter such as leaves, dust, garbage, etc. may fall onto the outside of the first air outlet grille 14. If the heating element 21 is located on the outside of the first air outlet grille 14, it may be scratched or corroded by the foreign matter. By arranging the heating element 21 on the inner side of the first air outlet grille 14, the first air outlet grille 14 can play a certain protective role for the heating element 21, reduce the possibility of damage to the heating component 2 due to external impact, etc., and help to extend the service life of the heating component 2. Moreover, since the heating element 21 is located on the inner side of the first air outlet grille 14, the heating element 21 is arranged inside the outdoor housing 1. Compared with arranging the heating element 21 outside the outdoor housing 1, it can improve safety and reduce the safety risks caused by accidentally touching the heating element 21.

[0043] According to some embodiments of the present invention, the heater 21 is embedded in the first air outlet grille 14. By embedding the heater 21 in the first air outlet grille 14, the connection between the heater 21 and the first air outlet grille 14 is more complete; by embedding the heater 21 in the first air outlet grille 14, the risk of burns or electric shock caused by accidentally touching the heater 21 can be avoided or reduced, thereby improving safety.

[0044] According to some embodiments of the present invention, the first air outlet grille 14 is integrally injection-molded with the heater 21. By integrally injection-molding the first air outlet grille 14 with the heater 21, the connection between the first air outlet grille 14 and the heater 21 is more secure; moreover, during installation, there is no need to add the step of connecting the first air outlet grille 14 to the heater 21, thereby improving installation efficiency.

[0045] According to some embodiments of the present invention, referring to Figure 6 and Figure 7 The heating element 21 is detachably mounted on the first air outlet grille 14. By making the heating element 21 detachably mounted on the first air outlet grille 14, it is more convenient for relevant personnel to maintain or repair the heating element 21.

[0046] According to some embodiments of the present invention, referring to Figure 6 and Figure 7 The heating element 21 is snap-connected to the first air outlet grille 14. By snap-connecting the heating element 21 to the first air outlet grille 14, the disassembly and assembly between the heating element 21 and the first air outlet grille 14 is more convenient, making it more convenient for relevant personnel to maintain or repair the heating element 21.

[0047] According to some embodiments of the present invention, referring to Figure 6 and Figure 7The first air outlet grille 14 includes a grille body 141 and a limiting structure 142. The limiting structure 142 is disposed on the inner side of the first air outlet grille 14. The limiting structure 142 is provided with a limiting hole 143, and the heating element 21 is inserted through the limiting hole 143. By making the first air outlet grille 14 include the grille body 141 and the limiting structure 142, the limiting structure 142 is disposed on the inner side of the first air outlet grille 14, and the limiting hole 143 is provided on the limiting structure 142, and the heating element 21 is inserted through the limiting hole 143, it is convenient to install the heating element 21 on or remove it from the first air outlet grille 14.

[0048] According to some embodiments of the present invention, the heating element 21 is an electric heating element 21. By making the heating element 21 an electric heating element 21, it is easier to start and stop the heating element 21, and it is easier to connect and install the heating element 21. By setting the heating element 21 as an electric heating element 21, it is convenient to control the start and stop of the heating element 21, and it is also possible to adjust the heating power of the heating element 21, making the control of the heating element 21 more convenient and flexible. The electric heating element 21 can generate heat relatively quickly to heat the frame top 1811, and the electric heating element 21 itself can also achieve relatively precise power adjustment, thereby accurately controlling the heat generation.

[0049] According to some embodiments of the present invention, the heat pump outdoor unit 100 includes a temperature detection component, which is used to detect the ambient temperature or the temperature of the outdoor heat exchanger. The temperature detection component and the heating component 2 are both electrically connected to the controller of the heat pump outdoor unit 100. When the ambient temperature or the temperature of the outdoor heat exchanger is too low, ice, frost, or snow may easily form on the first air outlet grille 14. By including the temperature detection component in the heat pump outdoor unit 100, the temperature detection component can detect the ambient temperature or the temperature of the outdoor heat exchanger. The temperature detection component and the heating component 2 are both electrically connected to the controller of the heat pump outdoor unit 100. The heat pump outdoor unit 100 can control the heating component 2 to turn on or off according to the temperature detected by the temperature detection component, thereby automatically heating the first air outlet grille 14, removing ice and snow on the first air outlet grille 14, and reducing the risk of the first air outlet 121 being blocked by ice and snow.

[0050] For example, when the temperature detection component detects that the outdoor ambient temperature or the outdoor heat exchanger is low, it means that the first air outlet grille 14 has a greater risk of ice or frost, which may cause blockage of the first air outlet 121. At this time, the controller of the heat pump outdoor unit 100 can control the heating element 21 to turn on to achieve ice, frost or snow melting on the first air outlet grille 14. After the ice, frost or snow melting is completed, the controller of the heat pump outdoor unit 100 can control the heating element 21 to turn off. In addition, when the heating element 21 is turned on to melt ice, frost or snow on the first air outlet grille 14, the heating power of the heating element 21 can be adjusted according to the outdoor ambient temperature or the outdoor heat exchanger. For example, the lower the outdoor ambient temperature or the outdoor heat exchanger, the greater the heating power can be adjusted.

[0051] According to some embodiments of the present invention, referring to Figures 1-4 The first air outlet 121 is located at the top of the outdoor housing 1. By locating the first air outlet 121 at the top of the outdoor housing 1, at least part of the airflow can be discharged from the top of the outdoor housing 1, reducing the discomfort caused by the impact of the air outlet from the front on the human body. The first air outlet grille 14 and the heating assembly 2 are provided at the first air outlet 121 located at the top, which can effectively reduce the entry of external debris into the outdoor housing 1 through the first air outlet 121. The heating assembly 2 can remove ice and snow on the first air outlet grille 14, reducing the risk of the first air outlet 121 being blocked by ice and snow.

[0052] According to some embodiments of the present invention, referring to Figure 6 and Figure 7 At least a portion of the upper surface of the first air outlet grille 14 forms a guide surface 1441, which extends downwardly and obliquely. By ensuring that at least a portion of the upper surface of the first air outlet grille 14 forms the guide surface 1441 and that the guide surface 1441 extends downwardly and obliquely, snow water that falls onto the guide surface 1441 flows downwardly along the guide surface 1441 under its own gravity and eventually leaves the guide surface 1441, thereby preventing excessive snow water from accumulating on the guide surface 1441 and blocking the first air outlet 121.

[0053] According to some embodiments of the present invention, referring to Figure 6 and Figure 7, the angle between the guide surface 1441 and the horizontal plane is α, 0°<α≤15°. For example, the value of α can be 1°, 3°, 6°, 9°, 12°, 15°, etc. By making the angle α between the guide surface 1441 and the horizontal plane greater than 0°, the guide surface 1441 can be made to have a downward tilt feature, thereby preventing excessive snow and water from accumulating on the guide surface 1441 and affecting the air outlet of the first air outlet 121; by making the angle α between the guide surface 1441 and the horizontal plane not exceed 15°, the airflow can be made to flow out of the first air outlet 121 at the top more smoothly, thereby reducing the flow resistance of the airflow out of the first air outlet 121 at the top.

[0054] According to some embodiments of the present invention, referring to Figure 6 and Figure 7 The guide surface 1441 extends downwardly and obliquely in the front-to-back direction. By extending the guide surface 1441 obliquely and downwardly in the front-to-back direction, the guide surface 1441 can guide the snow water, so that the snow water falling on the guide surface 1441 flows downward under the action of its own gravity. Since the first air outlet 121 is located at the front end of the outdoor casing 1, this part of the snow water can leave the top of the heat pump outdoor unit 100 from the front end of the outdoor casing 1, and can be more easily discharged from the front side of the outdoor casing 1, thereby more effectively reducing the accumulation of snow or water on the top of the heat pump outdoor unit 100.

[0055] According to some embodiments of the present invention, referring to Figure 6 and Figure 7 The guide surface 1441 extends downwardly and tilted from back to front. Since the front of the heat pump outdoor unit 100 typically has a larger space, snow water can more easily drain from the heat pump outdoor unit 100. By extending the guide surface 1441 tilted downwardly and tilted in the front-to-back direction, the guide surface 1441 can guide the snow water. Snow water that falls onto the guide surface 1441 flows downward and forward simultaneously under its own gravity, making it easier to drain from the heat pump outdoor unit 100.

[0056] For example, the air inlet 11 of the heat pump outdoor unit 100 is located on the rear side of the heat pump outdoor unit 100. By making the guide surface 1441 extend downward in an inclined direction from the back to the front, the snow water falling on the guide surface 1441 flows downward and forward at the same time under the action of its own gravity, which can prevent the snow water from clogging the air inlet 11 of the heat pump outdoor unit 100 and causing insufficient air intake of the heat pump outdoor unit 100.

[0057] According to some embodiments of the present invention, the upper surface of the outdoor housing 1 includes a second surface 145 located in front of the first air outlet 121, and the second surface 145 is no higher than the first surface 144. After snow water falls on the first surface 144, it flows along the first surface 144 under the action of its own gravity to between the first surface 144 and the second surface 145. By ensuring that the second surface 145 is no higher than the first surface 144, this snow water can be prevented from accumulating between the second surface 145 and the first surface 144 and being difficult to drain, thereby making it easier for this snow water to drain out of the heat pump outdoor unit 100.

[0058] For example, the second surface 145 is flush with the lowest point of the first surface 144 ; for another example, the second surface 145 is lower than the lowest point of the first surface 144 .

[0059] According to some embodiments of the present invention, referring to Figure 3 and Figure 8 The outdoor casing 1 includes a casing body 17, a front partition 173 and an air outlet frame 18. The air outlet frame 18 is arranged on the front side of the casing body 17. The front partition 173 is arranged between the casing body 17 and the air outlet frame 18. The casing body 17 and the front partition 173 jointly define an installation cavity 172. The heat exchange and exhaust assembly 3 is arranged in the installation cavity 172. The air outlet frame 18 and the front partition 173 jointly define an air outlet cavity. The front partition 173 is provided with an air flow outlet 174. The air flow outlet 174 connects the air outlet cavity and the installation cavity 172. The casing body 17 is provided with an air inlet 11 connected to the installation cavity 172. The air outlet frame 18 is provided with an air outlet 12 connected to the air outlet cavity. When the heat pump outdoor unit 100 is working, external air enters the installation cavity 172 through the air inlet 11 and flows to the heat exchange and exhaust component 3. The air after heat exchange by the heat exchange and exhaust component 3 flows to the air outlet cavity through the air flow outlet 174, and then flows out from the air outlet 12 to the outside of the heat pump outdoor unit 100.

[0060] By placing the heat exchange and exhaust assembly 3 within the mounting chamber 172, the heat exchange and air supply assembly can heat the airflow entering the mounting chamber 172 and direct the heat-exchanged airflow to the airflow outlet 174, allowing the heat-exchanged airflow to flow out of the airflow outlet 174 more smoothly. The airflow outlet 174 connects the air outlet chamber and the mounting chamber 172, allowing the airflow within the mounting chamber 172 to flow more smoothly into the air outlet chamber and then be discharged from the air outlet 12.

[0061] The air outlet frame 18 is arranged on the front side of the casing body 17, the casing body 17 and the front partition 173 jointly define the installation cavity 172, the air outlet frame 18 and the front partition 173 jointly define the air outlet cavity, the heat exchange exhaust assembly 3 is arranged in the installation cavity 172 and the air outlet frame 18 is provided with an air outlet 12 connected to the air outlet cavity, so that the air outlet cavity and the installation cavity 172 can be arranged in an orderly manner, reducing the space occupied by the air outlet cavity in the installation cavity 172, which is conducive to the layout optimization in the installation cavity 172; and, the air outlet frame 18 and the front partition 173 jointly define the air outlet cavity, so that the flow cross-section of the gas in the air outlet cavity can be made larger than the flow cross-section of the air flow at the air outlet 174. In this way, when the air flow rate is constant, the flow cross-section of the gas in the air outlet cavity is larger than the flow cross-section of the air flow at the air outlet 174, which can buffer the air flow out of the air outlet 174, reduce or avoid the air flow directly impacting the human body at an excessively high flow rate, thereby reducing the discomfort of the human body and helping to improve the user experience.

[0062] Optionally, refer to Figure 8 The air outlet 174 may be covered with an air outlet mesh cover 19 , which prevents foreign matter entering the air outlet cavity from entering the installation cavity 172 .

[0063] According to some embodiments of the present invention, referring to Figure 2 and Figure 8 The outdoor casing 1 includes a middle partition 171, which is arranged in the casing body 17 to separate the installation cavity 172 into a first installation cavity 1721 and a second installation cavity 1722 arranged along the left and right directions. The heat exchange and exhaust assembly 3 includes an outdoor heat exchanger, an outdoor fan 31 and a compressor. The outdoor heat exchanger and the outdoor fan 31 are arranged in the first installation cavity 1721, and the compressor is arranged in the second installation cavity 1722. The air inlet 11 and the air outlet cavity are both connected to the first installation cavity 1721.

[0064] The installation cavity 172 is divided into a first installation cavity 1721 and a second installation cavity 1722 by the middle partition 171, so that the outdoor heat exchanger and the outdoor fan 31 in the first installation cavity 1721 can be separated from the compressor in the second installation cavity 1722, so that the outdoor heat exchanger, the outdoor fan 31 and the compressor are arranged in an orderly manner, and interference between the outdoor heat exchanger, the outdoor fan 31 and the compressor can be avoided. By arranging the compressor, the outdoor heat exchanger and the outdoor fan 31 in different cavities respectively, the interference of the compressor on the outdoor heat exchanger and the outdoor fan 31 can be reduced.

[0065] Since both the air inlet 11 and the air outlet cavity are connected to the first installation cavity 1721, external air can enter the first installation cavity 1721 through the air inlet 11 to exchange heat with the outdoor heat exchanger. Driven by the outdoor fan 31, the air flow after heat exchange can flow into the air outlet cavity through the air flow outlet 174 for buffering and then be discharged to the outside of the heat pump outdoor unit 100, thereby reducing the discomfort caused by the impact of the outlet air flow on the human body.

[0066] In addition, the installation chamber 172 is divided into a first installation chamber 1721 and a second installation chamber 1722 by a central partition 171. This partitioning design facilitates maintenance and repair of each component. Maintenance personnel can open the corresponding chamber for inspection and repair in a targeted manner without having to perform large-scale disassembly of the entire heat pump outdoor unit 100. For example, if the outdoor fan 31 malfunctions, only the relevant part of the first installation chamber 1721 needs to be opened for inspection, without affecting the compressor located in the second installation chamber 1722. This greatly shortens maintenance time and improves maintenance efficiency.

[0067] Reference Figure 8 According to some embodiments of the present invention, the projection of the first installation cavity 1721 on the reference plane is the first projection, the projection of the second installation cavity 1722 on the reference plane is the second projection, and the projection of the air outlet cavity on the reference plane is the third projection. At least a portion of the first projection overlaps with the third projection, and at least a portion of the second projection overlaps with the third projection. The reference plane is a plane perpendicular to the front-to-back direction. The overlap of at least a portion of the first projection with the third projection may include the following situations: for example, a portion of the first projection may overlap with the third projection; or as another example, the entire first projection may overlap with the third projection. The overlap of at least a portion of the second projection with the third projection may include the following situations: for example, a portion of the second projection may overlap with the third projection; or as another example, the entire second projection may overlap with the third projection.

[0068] By making at least a portion of the first projection coincide with the third projection, at least a portion of the resulting air cavity can be opposite to the first installation cavity 1721 in the front-to-back direction, and by making at least a portion of the second projection coincide with the third projection, at least a portion of the resulting air cavity can be opposite to the second installation cavity 1722 in the front-to-back direction, so that the air outlet cross-sectional area of the resulting air cavity can be larger. In this way, when the airflow in the first installation cavity 1721 flows into the air outlet cavity with a larger air outlet cross-sectional area through the airflow outlet 174, the flow area of the airflow is increased, which can effectively reduce the flow velocity and impact force of the airflow flowing into the air outlet cavity, thereby better buffering the airflow flowing into the air outlet cavity. In this way, after the airflow buffered by the air outlet cavity is discharged from the air outlet 12, the discomfort caused by the impact on the human body can be better reduced.

[0069] Reference Figure 8According to some embodiments of the present invention, the depth of the air outlet cavity in the front-to-back direction is smaller than the depth of the mounting cavity 172 in the front-to-back direction. By making the depth of the air outlet cavity smaller than the depth of the mounting cavity 172 in the front-to-back direction, the airflow flowing out of the air outlet 174 in the air outlet cavity is buffered, and the overall front-to-back dimensions of the heat pump outdoor unit 100 can be made smaller, thereby reducing the space occupied by the heat pump outdoor unit 100.

[0070] Reference Figure 8 According to some embodiments of the present invention, the ratio of the depth of the air outlet cavity in the front-to-back direction to the depth of the mounting cavity 172 in the front-to-back direction ranges from 0.1 to 0.5. For example, the ratio of the depth of the air outlet cavity in the front-to-back direction to the depth of the mounting cavity 172 in the front-to-back direction can be 0.1, 0.2, 0.3, 0.4, 0.5, etc. By making the ratio of the depth dimension of the air outlet cavity in the front-to-back direction to the depth dimension of the installation cavity 172 in the front-to-back direction not less than 0.1, the air outlet cavity can effectively buffer the airflow, thereby reducing the discomfort caused by the impact of the airflow on the human body due to excessive flow rate; by making the ratio of the depth dimension of the air outlet cavity in the front-to-back direction to the depth dimension of the installation cavity 172 in the front-to-back direction not greater than 0.5, the depth dimension of the air outlet cavity in the front-to-back direction can be set more reasonably, thereby enabling the heat pump outdoor unit 100 to reduce the discomfort caused by the impact of the outlet airflow on the human body while making the overall size of the heat pump outdoor unit 100 smaller in the front-to-back direction, thereby reducing the space occupied by the heat pump outdoor unit 100 as a whole.

[0071] By setting the ratio of the depth of the air outlet cavity in the front-to-back direction to the depth of the installation cavity 172 in the front-to-back direction in the range of 0.1 to 0.5, the buffering effect of the air outlet cavity on the airflow and the overall size of the heat pump outdoor unit 100 in the front-to-back direction can be better balanced.

[0072] According to some embodiments of the present invention, referring to Figure 3 The air outlet frame 18 is detachably connected to the casing body 17. This can facilitate maintenance or replacement of the air outlet frame 18 or the casing body 17. For example, one of the air outlet frame 18 and the casing body 17 may be provided with a hook, and the other of the air outlet frame 18 and the casing body 17 may be provided with a slot. By snapping the hook and the slot together, the air outlet frame 18 and the casing body 17 can be detachably connected, making the connection between the air outlet frame 18 and the entire casing simple and highly stable. Alternatively, the air outlet frame 18 and the casing body 17 may be connected by fasteners, which can also achieve detachable connection between the air outlet frame 18 and the casing body 17.

[0073] According to some embodiments of the present invention, referring to Figure 3 and Figure 4 The air outlet frame 18 includes a frame portion 181 and a front panel 182. The frame portion 181 is annular. The front panel 182 is covered on the front side of the frame portion 181. The frame portion 181 is connected between the front panel 182 and the casing body 17. The air outlet 12 is formed in the frame portion 181.

[0074] The frame 181 supports the front panel 182. The front panel 182 covers the front side of the frame 181, shielding the internal structure of the air outlet frame 18, thereby enhancing the overall aesthetics of the heat pump outdoor unit 100. The air outlet 12 is formed in the frame 181, allowing the air to be discharged through the periphery of the heat pump outdoor unit 100. For example, the air can be discharged from the top, side, or bottom of the heat pump outdoor unit 100, thereby avoiding the discomfort caused by the air flowing directly from the front to the human body.

[0075] For example, when the heat pump outdoor unit 100 in the related art is installed on the first floor and faces the road, the airflow after heat exchange is blown out from the front side of the heat pump outdoor unit 100, which may blow onto pedestrians passing by, causing discomfort. Especially in the hot summer, the hot air after heat exchange blowing onto pedestrians will aggravate the discomfort. By forming the air outlet 12 in the frame portion 181, the airflow can be discharged through the side of the heat pump outdoor unit 100, which can effectively reduce the discomfort caused by the airflow blowing directly from the front side of the heat pump outdoor unit 100 onto pedestrians.

[0076] According to some embodiments of the present invention, referring to Figure 4 The frame portion 181 includes a frame top portion 1811, which is located at the top of the frame portion 181. The first air outlet 121 is provided at the frame top portion 1811. By providing the first air outlet 121 at the frame top portion 1811, the airflow can be discharged more smoothly from the frame top portion 1811 to the outside of the heat pump outdoor unit 100. For example, in hot summer, the temperature of the airflow after heat exchange in the heat pump outdoor unit 100 is relatively high. According to the physical property of hot air rising, the airflow with a higher temperature will flow upward. By providing at least a portion of the air outlet 12 at the frame top portion 1811, this part of the airflow with a higher temperature can be facilitated to flow out of the air outlet 12 to the outside of the heat pump outdoor unit 100 more smoothly, and the discomfort caused by the airflow to the human body can be reduced.

[0077] According to some embodiments of the present invention, referring to Figure 2 The frame portion 181 includes a frame bottom portion 1812 located at the bottom, and the air outlet 12 includes a second air outlet 122 . The second air outlet 122 is arranged at the frame bottom portion 1812 , and at least a portion of the second air outlet 122 constitutes the drain port 13 .

[0078] Among them, at least part of the second air outlet 122 constitutes the drain outlet 13, which may include the following situations: for example, part of the second air outlet 122 may constitute the drain outlet 13; for another example, the entire second air outlet 122 may constitute the drain outlet 13.

[0079] By providing a second air outlet 122 at the bottom 1812 of the frame, the air outlet area can be increased, and it can also serve as a drain outlet 13. In this way, water flowing downward from the top 1811 of the frame into the air outlet cavity can be discharged through the second air outlet 122 or the drain outlet 13 at the bottom 1812 of the frame, thereby preventing water falling into the air outlet cavity from accumulating in the air outlet cavity.

[0080] Optionally, a second air outlet grille 15 may be provided at the second air outlet 122 to reduce the amount of foreign matter that enters the outdoor casing 1 through the second air outlet 122 .

[0081] According to some embodiments of the present invention, referring to Figures 1-4 The frame 181 includes a frame bottom 1812 and a frame side 1813, the frame top 1811 is located at the top of the frame 181, the frame bottom 1812 is located at the bottom of the frame 181, the frame side 1813 is connected to the left and right sides of the frame top 1811 and the frame bottom 1812, and the air outlet 12 includes a third air outlet 123, and the third air outlet 123 is arranged on the frame side 1813. The first air outlet 121 at the top of the frame 1811 is conducive to the upward discharge of air with higher temperature. The third air outlet 123 at the side of the frame 1813 increases the air outlet area from the side of the heat pump outdoor unit 100, which can avoid the accumulation of air flow at the side, further improving the overall air outlet efficiency. By forming air outlets 12 at both the top of the frame 1811 and the side of the frame 1813, the air outlet area can be increased, the overall air outlet efficiency of the heat pump outdoor unit 100 can be improved, and the air flow can be avoided from directly impacting the human body at an excessively high flow rate from the front side of the frame 181, thereby reducing human discomfort.

[0082] Optionally, a third air outlet grille 16 may be provided at the third air outlet 123 to reduce the amount of foreign matter that enters the outdoor casing 1 through the third air outlet 123 .

[0083] Reference Figures 1-4 According to some embodiments of the present invention, the first air outlet 121 includes a plurality of first sub-air outlets 12 spaced apart from each other, and the third air outlet 123 includes a plurality of second sub-air outlets 12 spaced apart from each other, with the cross-sectional area of a single first sub-air outlet 12 being smaller than the cross-sectional area of a single second sub-air outlet 12. The smaller cross-sectional areas of the plurality of first sub-air outlets 12 at the frame top 1811 can effectively prevent external foreign matter from directly entering the air outlet cavity. The larger cross-sectional areas of the second sub-air outlets 12 at the frame side 1813 can enable airflow to be discharged more smoothly from the side to the exterior of the heat pump outdoor unit 100, thereby improving the air outlet efficiency of the heat pump outdoor unit 100.

[0084] Reference Figures 1-4 According to some embodiments of the present invention, the air outlet 12 is arranged around the frame 181, so that the air flow can be discharged from multiple directions of the frame 181 to the outside of the heat pump outdoor unit 100, which can increase the air outlet area, improve the air outlet efficiency, and reduce the discomfort caused by the impact of the air outlet airflow on the human body.

[0085] The heat pump system according to the second embodiment of the present invention includes: an air conditioner indoor unit and the heat pump outdoor unit 100 according to the first embodiment of the present invention.

[0086] According to the heat pump system of an embodiment of the present invention, by including the heat pump outdoor unit 100 according to the first embodiment of the present invention, the problem of debris entering the interior of the outdoor casing 1 through the first air outlet 121 and affecting the components inside the outdoor casing 1 is reduced; and ice and snow are prevented from blocking the first air outlet 121, resulting in a reduction in the actual air outlet area of the heat pump outdoor unit 100 or failure to discharge air normally.

[0087] According to a control method of a heat pump outdoor unit 100 according to an embodiment of a third aspect of the present invention, the heat pump outdoor unit 100 is the heat pump outdoor unit 100 according to the embodiment of the first aspect of the present invention, and the control method of the heat pump outdoor unit 100 includes: Detect the ambient temperature or the temperature of the outdoor heat exchanger; Controlling the heating component 2 according to the ambient temperature or the temperature of the outdoor heat exchanger; When the ambient temperature is lower than a first preset temperature or the outdoor heat exchanger temperature is lower than a second preset temperature, the heating component 2 is turned on, wherein the first preset temperature may be higher than the second preset temperature.

[0088] When the heat pump outdoor unit 100 is working, when the ambient temperature is too low or the outdoor heat exchanger temperature is too low, for example, when the ambient temperature is lower than the first preset temperature or the outdoor heat exchanger temperature is lower than the second preset temperature, there is a risk of ice or frost on the first air outlet grille 14 or there is a high possibility of snow accumulation. The heating component 2 is turned on to heat and melt the ice, frost or snow on the first air outlet grille 14 to prevent ice and snow from blocking the first air outlet 121.

[0089] According to the control method of the heat pump outdoor unit 100 in an embodiment of the present invention, by controlling the heating component 2 according to the ambient temperature or the temperature of the outdoor heat exchanger, the heating component 2 can heat the first air outlet grille 14 to prevent ice and snow from blocking the first air outlet 121, resulting in a reduction in the actual air outlet area of the heat pump outdoor unit 100 or failure to discharge air normally.

[0090] According to some embodiments of the present invention, the heat pump outdoor unit 100 has a defrost mode. In the defrost mode, the outdoor heat exchanger acts as a condenser. The control method of the heat pump outdoor unit 100 includes: in the defrost mode, turning off the heating component 2.

[0091] When the heat pump outdoor unit 100 is in the defrost mode, the outdoor heat exchanger acts as a condenser and can generate heat. The heat generated by the outdoor heat exchanger can not only melt and remove the frost, ice or snow attached to the outdoor heat exchanger, but also utilize the heat generated by the outdoor heat exchanger and transfer the heat generated by the outdoor heat exchanger to the first air outlet 121 through the airflow, so as to melt and remove the frost, ice or snow on the first air outlet grille 14 located at the first air outlet 121. At this time, the heating component 2 can be turned off to save energy and reduce energy consumption.

[0092] Refer to the following Figures 1-8 The heat pump outdoor unit 100 according to some specific embodiments of the present invention will be described.

[0093] In this embodiment, the heat pump outdoor unit 100 includes an outdoor casing 1 , a heating component 2 and a heat exchange and exhaust component 3 . The heat exchange and exhaust component 3 is disposed in the outdoor casing 1 .

[0094] The outdoor housing 1 is provided with an air inlet 11 and an air outlet 12. The air outlet 12 includes a first air outlet 121 located at the top of the outdoor housing 1. A first air outlet grille 14 is provided at the first air outlet 121 and is detachably connected to the outdoor housing 1. At least a portion of the upper surface of the first air outlet grille 14 forms a guide surface 1441. The guide surface 1441 extends downwardly and obliquely from the back to the front. The angle α between the guide surface 1441 and the horizontal plane is 0°<α≤15°.

[0095] The outdoor casing 1 includes a casing body 17, a front partition 173 and an air outlet frame 18. The air outlet frame 18 is arranged on the front side of the casing body 17. The front partition 173 is arranged between the casing body 17 and the air outlet frame 18. The casing body 17 and the front partition 173 jointly define an installation cavity 172. The heat exchange and exhaust assembly 3 is arranged in the installation cavity 172. The air outlet frame 18 and the front partition 173 jointly define an air outlet cavity. The front partition 173 is provided with an air flow outlet 174. The air flow outlet 174 connects the air outlet cavity and the installation cavity 172. The casing body 17 is provided with an air inlet 11 connected to the installation cavity 172. The air outlet frame 18 is provided with an air outlet 12 connected to the air outlet cavity.

[0096] The outdoor casing 1 includes a middle partition 171, which is arranged in the casing body 17 to separate the installation cavity 172 into a first installation cavity 1721 and a second installation cavity 1722 arranged along the left and right directions. The heat exchange and exhaust assembly 3 includes an outdoor heat exchanger, an outdoor fan 31 and a compressor. The outdoor heat exchanger and the outdoor fan 31 are arranged in the first installation cavity 1721, and the compressor is arranged in the second installation cavity 1722. The air inlet 11 and the air outlet cavity are both connected to the first installation cavity 1721.

[0097] The air outlet frame 18 is detachably connected to the housing body 17 and includes a frame portion 181 and a front panel 182. The frame portion 181 is annular, and the front panel 182 is covered on the front side of the frame portion 181. The frame portion 181 is connected between the front panel 182 and the housing body 17. The air outlet 12 is formed in the frame portion 181. The frame portion 181 includes a frame top portion 1811, which is located at the top of the frame portion 181. The first air outlet 121 is provided at the frame top portion 1811. The frame portion 181 includes a frame bottom 1812 located at the bottom, the air outlet 12 includes a second air outlet 122, the second air outlet 122 is arranged at the frame bottom 1812, and at least part of the second air outlet 122 constitutes the drain outlet 13, the frame portion 181 includes a frame bottom 1812 and a frame side 1813, the frame top 1811 is located at the top of the frame portion 181, the frame bottom 1812 is located at the bottom of the frame portion 181, the frame side 1813 is connected to the left and right sides of the frame top 1811 and the frame bottom 1812, the air outlet 12 includes a third air outlet 123, and the third air outlet 123 is arranged at the frame side 1813.

[0098] The heating assembly 2 includes a heater 21, which is an electric heater and is located within the first air outlet grille 14. The heater 21 is located inside the first air outlet grille 14 and is removably mounted thereto. The heater 21 and the first air outlet grille 14 are connected by a snap-fit connection. The first air outlet grille 14 includes a grille body 141 and a retaining structure 142. The retaining structure 142 is located within the first air outlet grille 14 and has a retaining hole 143 defined therein. The heater 21 is inserted through the retaining hole 143.

[0099] The heat pump outdoor unit 100 includes a temperature detection component, which is used to detect the ambient temperature or the temperature of the outdoor heat exchanger. The temperature detection component and the heating component 2 are both electrically connected to the controller of the heat pump outdoor unit 100.

[0100] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0101] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0102] In the description of the present invention, "plurality" means two or more.

[0103] In the description of the present invention, a first feature being “on” or “under” a second feature may include the first and second features being in direct contact with each other, or the first and second features not being in direct contact with each other but being in contact with each other via another feature therebetween.

[0104] In the description of the present invention, “on”, “above” and “above” a first feature of a second feature include the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0105] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0106] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A heat pump outdoor unit, characterized in that: include: an outdoor casing, wherein the outdoor casing comprises a casing body, a front partition and an air outlet frame, the air outlet frame being arranged on the front side of the casing body, the front partition being arranged between the casing body and the air outlet frame, the casing body and the front partition jointly define an installation cavity, the air outlet frame and the front partition jointly define an air outlet cavity, an air flow outlet being arranged on the front partition, the air flow outlet being connected with the air outlet cavity and the installation cavity, the casing body being provided with an air inlet being connected with the installation cavity, the air outlet frame being provided with an air outlet being connected with the air outlet cavity, the air outlet frame comprising a frame top located at the top, the air outlet comprising a first air outlet arranged at the frame top, and a first air outlet grille being provided at the first air outlet; A heating assembly, comprising a heating element, wherein the heating element is arranged on the first air outlet grille; The heat exchange and exhaust assembly is arranged in the installation cavity.

2. The heat pump outdoor unit according to claim 1, characterized in that: The first air outlet grille is detachably connected to the outdoor casing.

3. The heat pump outdoor unit according to claim 1, characterized in that: The heating element is arranged on the inner side of the first air outlet grille.

4. The heat pump outdoor unit according to claim 1, characterized in that: The heating element is embedded in the first air outlet grille.

5. The heat pump outdoor unit according to claim 1, characterized in that: The first air outlet grille is integrally injection-molded with the heating element.

6. The heat pump outdoor unit according to claim 1, characterized in that: The heating element is detachably mounted on the first air outlet grille.

7. The heat pump outdoor unit according to claim 6, characterized in that: The heating element is snap-connected to the first air outlet grille.

8. The heat pump outdoor unit according to claim 7, characterized in that: The first air outlet grille includes a grille body and a limiting structure. The limiting structure is arranged on the inner side of the first air outlet grille. A limiting hole is provided on the limiting structure. The heating element is passed through the limiting hole.

9. The heat pump outdoor unit according to claim 1, characterized in that: The heating element is an electric heating element.

10. The heat pump outdoor unit according to claim 1, characterized in that: It comprises a temperature detection component, which is used to detect the ambient temperature or the temperature of the outdoor heat exchanger. The temperature detection component and the heating component are both electrically connected to the controller of the heat pump outdoor unit.

11. The heat pump outdoor unit according to claim 1, characterized in that: At least a portion of the upper surface of the first air outlet grille forms a guide surface, and the guide surface extends obliquely downward.

12. The heat pump outdoor unit according to claim 11, characterized in that: The included angle between the guide surface and the horizontal plane is α, 0°<α≤15°.

13. The heat pump outdoor unit according to claim 11, characterized in that: The guide surface extends obliquely downward in the front-rear direction.

14. The heat pump outdoor unit according to claim 13, characterized in that: The guide surface extends obliquely downward in a direction from rear to front.

15. The heat pump outdoor unit according to any one of claims 1 to 14, characterized in that: The outdoor casing includes a middle partition, which is arranged in the casing body to divide the installation cavity into a first installation cavity and a second installation cavity arranged along the left and right directions. The heat exchange and exhaust assembly includes an outdoor heat exchanger, an outdoor fan and a compressor. The outdoor heat exchanger and the outdoor fan are arranged in the first installation cavity, the compressor is arranged in the second installation cavity, and the air inlet and the air outlet cavity are both connected to the first installation cavity.

16. The heat pump outdoor unit according to any one of claims 1 to 14, characterized in that: The air outlet frame is detachably connected to the casing body.

17. The heat pump outdoor unit according to any one of claims 1 to 14, characterized in that: The air outlet frame includes a frame portion and a front panel, the frame portion includes the frame top located at the top, the frame portion is annular, the front panel cover is arranged on the front side of the frame portion, the frame portion is connected between the front panel and the casing body, and the air outlet is formed in the frame portion.

18. The heat pump outdoor unit according to claim 17, characterized in that: The frame portion includes a frame bottom portion located at the bottom, and the air outlet includes a second air outlet. The second air outlet is arranged at the frame bottom portion, and at least a portion of the second air outlet constitutes a drain outlet.

19. The heat pump outdoor unit according to claim 17, characterized in that: The frame portion includes a frame bottom and a frame side portion, the frame top portion is located at the top of the frame portion, the frame bottom is located at the bottom of the frame portion, the frame side portion is connected to the left and right sides of the frame top and the frame bottom, and the air outlet includes a third air outlet, and the third air outlet is arranged on the frame side portion.

20. A heat pump system, characterized in that: include: Air conditioner indoor unit; The heat pump outdoor unit according to any one of claims 1 to 19.

21. A control method for a heat pump outdoor unit, characterized in that: The heat pump outdoor unit is a heat pump outdoor unit according to any one of claims 1 to 19, and the control method of the heat pump outdoor unit includes: Detect the ambient temperature or the temperature of the outdoor heat exchanger; controlling the heating component according to the ambient temperature or the temperature of the outdoor heat exchanger; When the ambient temperature is lower than a first preset temperature or the outdoor heat exchanger temperature is lower than a second preset temperature, the heating component is turned on.

22. The control method of the heat pump outdoor unit according to claim 21, characterized in that: The heat pump outdoor unit has a defrost mode. In the defrost mode, the outdoor heat exchanger serves as a condenser. The control method of the heat pump outdoor unit includes: In the defrost mode, the heating component is turned off.

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