Fan and heat pump apparatus

Abstract

This utility model discloses a fan and heat pump equipment, relating to the technical field of heat pump equipment. The fan includes a volute, a rotor, and a flexible covering layer. The volute includes a first housing and a second housing, which are detachably connected and define an air outlet cavity. The volute has an air inlet and an air outlet, which are respectively connected to the air outlet cavity. The rotor is installed inside the air outlet cavity, with its inlet facing the air inlet and its outlet facing the air outlet. The flexible covering layer covers at least a portion of the cavity wall. The fan of this utility model can reduce airflow resistance and noise during gas flow, thereby reducing the fan's energy consumption, improving energy efficiency, and meeting lightweight design requirements.

Description

Technical Field

[0001] This utility model relates to the field of heat pump equipment technology, and in particular to a fan and heat pump equipment. Background Technology

[0002] In heat pump equipment such as heat pump air conditioners, heat pump water heaters, or integrated heat pump air conditioner-water heater units, the fan casing is mainly made of polypropylene foam material, which is beneficial for weight reduction and improved heat insulation. However, the inner wall of the air duct made of polypropylene foam casing is relatively rough, resulting in high airflow resistance, high energy consumption, and turbulence that generates noise. Related technologies have used metal plate linings inside the casing, but this increases the weight of the fan. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a fan that can reduce airflow resistance and noise during gas flow, thereby reducing the fan's energy consumption, improving energy efficiency, and meeting lightweight design requirements.

[0004] This utility model also provides a heat pump device having the above-mentioned fan.

[0005] A fan according to a first aspect embodiment of the present invention includes a volute, a first housing and a second housing, the first housing and the second housing being detachably connected and defining an air duct cavity, the volute having an air inlet and an air outlet, the air inlet and the air outlet respectively communicating with the air duct cavity; a fan impeller installed in the air duct cavity, the air inlet end of the fan impeller facing the air inlet and the air outlet end of the fan impeller facing the air outlet; and a flexible covering layer covering at least a portion of the cavity wall of the air duct cavity.

[0006] The fan according to the first aspect of the present invention has at least the following beneficial effects: by providing a flexible covering layer on the cavity wall of the air duct cavity of the volute, the rough cavity wall of the air duct cavity is covered by the flexible covering layer, so that the turbulent boundary layer when the air flows through the air duct cavity is thinned and tends to a laminar flow state, thereby reducing airflow resistance and turbulent noise, reducing airflow friction loss, and thus reducing the energy consumption of the fan and improving energy efficiency. Since the volute is composed of a detachably connected first shell and a second shell, it is convenient to cover the cavity wall of the air duct cavity with the flexible covering layer, and the mass of the flexible covering layer is small, so that the fan can meet the requirements of lightweight design.

[0007] According to some embodiments of the present invention, the cavity wall of the air duct cavity includes a first end wall, a second end wall and a side wall. The first end wall and the second end wall are respectively located at both ends of the wind turbine along the axial direction. The side wall is arranged around the rotation axis of the wind turbine and connected to the first end wall and the second end wall. The flexible covering layer covers the first end wall, the second end wall and the side wall.

[0008] According to some embodiments of the present invention, the sidewall is provided with at least one positioning rib, the positioning rib is arranged along the circumference of the wind turbine, and the flexible covering layer includes at least two surface structures, the at least two surface structures are arranged at intervals along the axial direction and abut against the positioning rib on both sides along the axial direction.

[0009] According to some embodiments of the present invention, there are multiple positioning ribs, which are arranged at intervals along the axial direction, and the multiple positioning ribs and the multiple surface layer structures are arranged alternately along the axial direction.

[0010] According to some embodiments of the present invention, the flexible covering layer is bonded to the cavity wall of the air duct cavity.

[0011] According to some embodiments of the present invention, the flexible covering layer is configured as at least one of a metal foil or a polymer film.

[0012] According to some embodiments of the present invention, the volute is provided with a third end wall, which is located outside the air duct cavity and at the airflow outlet. The third end wall is arranged around the airflow outlet, and the flexible covering layer also covers the third end wall.

[0013] According to some embodiments of the present invention, the roughness of the wall surface of the flexible covering layer facing the wind turbine is 0.1 μm to 0.5 μm.

[0014] According to some embodiments of the present invention, the thickness of the flexible covering layer is 0.05mm to 0.3mm.

[0015] A heat pump device according to a second aspect of the present invention includes a housing and a fan according to a first aspect of the present invention, wherein the fan is mounted on the housing.

[0016] The heat pump device according to the second aspect of this utility model has at least the following beneficial effects: Because the heat pump device uses the aforementioned fan, a flexible covering layer is provided on the cavity wall of the air duct cavity of the volute. This flexible covering layer covers the rough cavity wall of the air duct cavity, causing the turbulent boundary layer of air flowing through the air duct cavity to thin and tend towards a laminar flow state. This reduces airflow resistance and turbulent noise, reduces airflow friction loss, and thus reduces the energy consumption of the fan and improves energy efficiency. Since the volute is composed of a detachably connected first shell and a second shell, it is convenient to cover the cavity wall of the air duct cavity with the flexible covering layer. Furthermore, the flexible covering layer has a small mass, allowing the fan to meet lightweight design requirements.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0019] Figure 1 This is a schematic diagram of the fan structure in an embodiment of this utility model;

[0020] Figure 2 This is an exploded view of the fan in an embodiment of this utility model;

[0021] Figure 3 This is a cross-sectional view of the fan in an embodiment of this utility model;

[0022] Figure 4 This is a comparison chart of the power variation curve of the fan in this embodiment of the present invention with the power variation curve of the fan with the air volume in the prior art.

[0023] Figure label:

[0024] 100 volute; 110 first housing; 120 second housing; 130 air duct cavity; 131 first end wall; 132 second end wall; 133 side wall; 134 positioning rib; 140 airflow inlet; 150 airflow outlet; 160 third end wall; 170 shaft hole;

[0025] Windmill 200. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0029] In the description of this utility model, unless otherwise explicitly defined, terms such as setting, installing, connecting, assembling, and cooperating should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0030] To achieve lightweight design, the casing of heat pump fans is typically made of polypropylene foam, which also improves insulation. However, the inner wall of the polypropylene foam casing is relatively rough, causing turbulence and a thick boundary layer when air flows through it. This results in high airflow resistance, significant frictional losses, increased energy consumption, and decreased energy efficiency. Furthermore, turbulence generates noise.

[0031] In related technologies, airflow resistance is reduced by installing a metal plate lining inside the casing, and noise is reduced by installing sound-insulating materials such as sound-absorbing cotton. However, this leads to an increase in the weight of the fan, making it difficult to achieve a balance between lightweight design and performance (such as energy consumption and noise).

[0032] Therefore, referring to Figures 1 to 3 As shown, the first aspect of this utility model provides a fan that is used in a heat pump device, which may be a heat pump air conditioner, a heat pump water heater, or a heat pump air conditioner-water heater integrated unit, etc.

[0033] Reference Figure 1 As shown, it can be understood that the wind turbine includes a volute 100, a rotor 200, and a flexible cladding layer. Of course, the wind turbine also includes a motor assembly.

[0034] Reference Figure 1As shown, it can be understood that in a heat pump device, a fan is used to drive a continuous flow of air. The heat pump device includes a housing, to which the fan is detachably mounted. Specifically, the volute 100 is connected to the housing via fasteners such as screws and bolts, or the volute 100 is engaged with the housing via snap-fit ​​connections. The volute 100 is provided with an air duct cavity 130, an air inlet 140, and an air outlet 150, with the air inlet 140 and air outlet 150 respectively communicating with the air duct cavity 130.

[0035] Reference Figure 1 As shown, it can be understood that the impeller 200 is rotatably mounted within the air duct cavity 130. In this embodiment, the fan is a centrifugal fan. One axial end of the impeller 200 is the air inlet end, meaning the impeller 200 takes in air axially, and the radial side of the impeller 200 is the air outlet end, meaning the impeller 200 exits air tangentially. Therefore, the air inlet end of the impeller 200 faces the airflow inlet 140 of the volute 100, meaning the airflow inlet 140 is located at one axial end of the impeller 200, and the air outlet end of the impeller 200 faces the airflow outlet 150, meaning the airflow outlet 150 is located on one radial side of the impeller 200.

[0036] Reference Figure 1 and Figure 2 As shown, it can be understood that the volute 100 is also provided with a shaft hole 170, which is located on the side of the impeller 200 facing away from the airflow inlet 140 along the axial direction. The motor assembly is located on the outer side of the volute 100 facing away from the airflow inlet 140 along the axial direction of the impeller 200 and is fixedly installed in the housing. The motor assembly consists of a stator and a rotor rotatably disposed in the inner hole of the stator. The drive shaft of the motor assembly is fixedly connected to the rotor, and the drive shaft of the motor assembly passes through the shaft hole 170 and is fixedly connected to the impeller 200.

[0037] Therefore, when the heat pump equipment is running, the motor assembly drives the impeller 200 to rotate. The impeller 200 drives air from the airflow inlet 140 into the air duct cavity 130 along the radial direction of the impeller 200, and flows out along the tangential direction of the impeller 200 through the airflow outlet 150 to the outside of the air duct cavity 130, thereby achieving continuous airflow.

[0038] Understandably, heat pump equipment typically includes a heat exchanger, which is installed in the casing and located on the side of the volute 100 away from the motor assembly, i.e., the airflow inlet 140 faces the heat exchanger. During operation, air passes through the heat exchanger and then enters the air duct cavity 130 through the airflow inlet 140. It is easy to understand that after passing through the heat exchanger, the refrigerant inside the heat exchanger exchanges heat with the air, causing the air temperature to drop. Therefore, after flowing through the heat exchanger and fan, the air temperature decreases, achieving space cooling, or transferring the air's heat to the refrigerant for further utilization.

[0039] Understandably, for heat pump air conditioners, both the air inlet 140 and the air outlet 150 are connected to the indoor space. Therefore, when a heat pump air conditioner is running, it can circulate the air in the indoor space and flow through the heat exchanger and fan, thereby cooling the air in the indoor space and meeting the cooling needs of the indoor space.

[0040] Understandably, for heat pump water heaters, both the air inlet 140 and the air outlet 150 can be connected to the outdoor space, or the air inlet 140 can be connected to the indoor space, and the air outlet 150 can be connected to the outdoor space. The refrigerant in the heat exchanger exchanges heat with the air to heat the water, thus meeting the user's hot water needs.

[0041] Understandably, for a heat pump air conditioner-water heater integrated unit, the air inlet 140 connects to the indoor space, while the air outlet 150 can selectively connect to either the indoor or outdoor space. When only hot water is being produced, the air outlet 150 connects to the outdoor space; similarly, the refrigerant in the heat exchanger exchanges heat with the air to heat the water. Simultaneously, when both hot water and cooling are being produced, the air outlet 150 connects to the indoor space. Similarly, this lowers the indoor air temperature while simultaneously using the refrigerant in the heat exchanger to heat the water.

[0042] Reference Figure 2 As shown, to facilitate the installation of the impeller 200, the volute 100 includes a detachably connected first housing 110 and a second housing 120. The first housing 110 and the second housing 120 are arranged sequentially along the axial direction of the impeller 200. The first housing 110 is located at the end of the impeller 200 away from the air inlet end, and the second housing 120 is located at the air inlet end of the impeller 200. When assembling the fan, the impeller 200 can be placed inside the first housing 110 or the second housing 120 firstly, and then the first housing 110 and the second housing 120 can be fixedly connected.

[0043] Reference Figure 1 and Figure 2 As shown, it can be understood that an air duct cavity 130 is defined between the first housing 110 and the second housing 120, an air inlet 140 is disposed in the second housing 120, a shaft hole 170 is disposed in the first housing 110, a portion of the structure of the air outlet 150 is disposed at the upper end of the first housing 110, and another portion of the structure of the air outlet 150 is disposed at the upper end of the second housing 120.

[0044] Reference Figure 2 As shown, it can be understood that the first housing 110 and the second housing 120 can be engaged by snap-fit, or the first housing 110 and the second housing 120 can be fixedly connected by fasteners such as screws, rivets, and bolts, which makes the connection stable and reliable and easy to assemble.

[0045] Understandably, the volute 100 is made of polypropylene foam material with a density of 30–60 kg / m³. 3 Specifically, it is 40kg / m 3 Furthermore, its closed-cell structure provides excellent structural strength. The volute 100, made of polypropylene foam, offers advantages such as light weight and good thermal insulation, facilitating the lightweight design of the fan. Moreover, during heat pump operation, the volute 100 reduces heat transfer from the outside of the fan to the air within the duct cavity 130, thereby lowering the temperature rise of the air within the duct cavity 130 and improving the energy efficiency of the heat pump.

[0046] Understandably, since the volute 100 is made of polypropylene foam material, the cavity wall of the air duct cavity 130 is relatively rough, with a roughness of about 8.2 μm.

[0047] Reference Figure 1 As shown, it can be understood that the flexible covering layer covers at least a portion of the cavity wall of the air duct cavity 130, and the flexible covering layer is fixedly connected to the volute 100. Specifically, the flexible covering layer has a thin film structure, and the flexible covering layer has good flexibility and is easy to bend, so as to increase the fit between the flexible covering layer and the cavity wall of the air duct cavity 130, increase the contact area between the flexible covering layer and the cavity wall of the air duct cavity 130, and thus improve the installation stability of the flexible covering layer.

[0048] Reference Figure 2 and Figure 3 As shown, in this embodiment, the cavity wall of the air duct cavity 130 includes a first end wall 131, a second end wall 132, and a side wall 133. Specifically, the first end wall 131 and the side wall 133 are both disposed on the side of the first housing 110 facing the air duct cavity 130. The first end wall 131 is located at the end of the impeller 200 away from the air inlet end and is perpendicular to the rotation axis of the impeller 200. The side wall 133 is located radially outside the impeller 200 and arranged around the rotation axis of the impeller 200. The second end wall 132 is disposed on the side of the second housing 120 facing the air duct cavity 130. The second end wall 132 is located at the air inlet end of the impeller 200 and is perpendicular to the rotation axis of the impeller 200. It is easy to understand that one end of the side wall 133 along the axial direction of the impeller 200 is connected to the first end wall 131, and after the first housing 110 and the second housing 120 are connected together, the other end of the side wall 133 along the axial direction of the impeller 200 is connected to the second end wall 132.

[0049] Reference Figure 2 and Figure 3As shown, in this embodiment, the flexible covering layer covers the first end wall 131, the second end wall 132, and the side wall 133; that is, the flexible covering layer covers the entire cavity wall of the air duct cavity 130. Because the flexible covering layer has good flexibility, it easily adapts to the curvature of the side wall 133, reduces wrinkles, and facilitates installation. The flexible covering layer covering the first end wall 131, the second end wall 132, and the side wall 133 can be an integral structure, or it can be a segmented structure, for example, the flexible covering layer is divided into three segments and covers the first end wall 131, the second end wall 132, and the side wall 133 respectively.

[0050] It is understandable and easy to understand that the side wall 133 of the flexible covering layer facing away from the cavity wall of the air duct cavity 130 is a smooth surface, that is, the wall surface of the flexible covering layer facing the impeller 200 is a smooth surface. The roughness of this smooth surface is 0.1μm to 0.5μm. In this embodiment, the roughness of the side wall 133 of the flexible covering layer facing away from the cavity wall of the air duct cavity 130 is 0.3μm, but it can also be 0.1μm, 0.2μm, 0.4μm, or 0.5μm, etc. The roughness of the side wall 133 of the flexible covering layer facing away from the cavity wall of the air duct cavity 130 is much smaller than the roughness of the cavity wall of the air duct cavity 130, and the coefficient of friction of the side wall 133 of the flexible covering layer facing away from the cavity wall of the air duct cavity 130 is small.

[0051] Therefore, by covering the rough cavity wall of the air duct cavity 130 with a flexible covering layer, when air flows through the air duct cavity 130, the turbulent boundary layer of the air flowing through the flexible covering layer is thinned and tends to a laminar state due to the relatively smooth surface and low coefficient of friction of the flexible covering layer. This effectively reduces airflow resistance and turbulent noise, reduces airflow friction loss, and thus reduces the energy consumption of the fan and improves energy efficiency. It is easy to understand that the turbulent noise here refers to the broadband noise generated by the turbulent field when the gas flows at high speed in the cavity.

[0052] Since the volute 100 is composed of a first housing 110 and a second housing 120 that are detachably connected, it is convenient to cover the cavity wall of the air duct cavity 130 with a flexible covering layer, which facilitates assembly.

[0053] In addition, the flexible cover layer has a small mass, which, combined with the lightweight volute 100 made of polypropylene foam, enables the fan to have good performance while meeting the requirements of lightweight design, thus balancing performance and lightweight design.

[0054] It is easy to understand that, since the flexible covering layer covers the entire cavity wall of the air duct cavity 130, it can minimize airflow resistance and reduce turbulence noise, reduce airflow friction loss, and thus reduce the energy consumption of the fan and improve energy efficiency.

[0055] According to the standard air volume test, at an air volume of 1200m³ / h3 Under the condition of / h, the pressure generated by airflow resistance decreases from 618Pa to 492Pa, the airflow resistance loss decreases significantly, and the power of the fan decreases from 206W to 164W, a reduction of 20.3%. In other words, under the premise of the same air volume, the power of the fan in this embodiment is significantly reduced, thereby reducing the energy consumption of the fan and improving energy efficiency.

[0056] Reference Figure 4 As shown, it is understandable that Figure 4 This is a comparison chart showing the power variation curve of the fan with air volume when the cavity wall of the air duct cavity 130 is not provided with a flexible covering layer (i.e., the prior art solution) and the power variation curve of the fan with air volume when the cavity wall of the air duct cavity 130 is provided with a flexible covering layer (i.e., this solution). Figure 4 The blue curve (at the top) represents the fan power versus airflow when the cavity wall of the duct cavity 130 is not covered with a flexible cladding layer. The red curve (at the bottom) represents the fan power versus airflow when the cavity wall of the duct cavity 130 is covered with a flexible cladding layer. The horizontal axis represents the fan's airflow, in meters (m³). 3 / h, the vertical axis represents the power of the fan, in W.

[0057] Reference Figure 4 As shown in the figure, it can be understood that the fan power increases with the increase of air volume. Under the premise of the same air volume, the power of the fan in the existing technical solution is greater than the power of the fan in this solution. For example, with an air volume of 1000 m³ / h... 3 At a speed of [amount missing], the power of the existing technology's fan is approximately 120W, while the power of the fan in this solution is approximately 100W. The power reduction of the fan in this solution compared to the existing technology's fan is 16.7%. The significant reduction in the fan's power in this solution reduces the fan's energy consumption and improves energy efficiency.

[0058] It is understood that in some embodiments, the flexible cladding layer covers one of the first end wall 131, the second end wall 132, and the side wall 133; or, the flexible cladding layer covers any two of the first end wall 131, the second end wall 132, and the side wall 133; or, the flexible cladding layer covers a portion of the structure of the first end wall 131, the second end wall 132, and the side wall 133. This can also reduce airflow resistance and turbulence noise to a certain extent, reduce airflow friction loss, and thus reduce the energy consumption of the fan and improve energy efficiency.

[0059] Understandably, the flexible covering layer is bonded to the cavity wall of the air duct cavity 130. Specifically, the flexible covering layer is bonded to the cavity wall of the air duct cavity 130 using an adhesive, such as an acrylic adhesive. During assembly, a robotic arm precisely adheres the flexible covering layer to the cavity wall of the air duct cavity 130. The bonded flexible covering layer and the cavity wall of the air duct cavity 130 exhibit good bonding strength, ensuring a stable and reliable connection, and the assembly is performed with the edges turned up. Due to the good flexibility of the flexible covering layer, it easily adapts to the curvature of the side wall 133 and smoothly adheres to the cavity wall of the air duct cavity 130, reducing wrinkles and keeping the side wall 133 facing away from the cavity wall of the air duct cavity 130 smooth, which helps to reduce airflow resistance.

[0060] Understandably, in order to further increase the bonding strength between the flexible covering layer and the cavity wall of the air duct cavity 130, gas-assisted injection molding technology is used to apply gas pressure to tightly adhere the flexible covering layer to the cavity wall of the air duct cavity 130, so that the bonding strength between the flexible covering layer and the cavity wall of the air duct cavity 130 reaches 1.5MPa, and the connection is stable and reliable.

[0061] Understandably, the flexible covering layer is configured as at least one of a metal foil or a polymer film. The metal foil can be aluminum foil, copper foil, tin foil, stainless steel foil, etc., and the polymer film can be polyester film (PET), polytetrafluoroethylene film (PTFE), etc. Both the metal foil and the polymer film have relatively smooth surfaces, which helps to reduce airflow resistance and turbulence noise, reduce airflow friction loss, and thus reduce the energy consumption of the fan and improve energy efficiency. At the same time, both the metal foil and the polymer film have good flexibility and are easy to bend, increasing the fit and contact area, thereby improving the installation stability of the flexible covering layer.

[0062] It is understood that in this embodiment, the flexible covering layer is configured as aluminum foil. Aluminum foil also possesses excellent thermal conductivity. It is readily understood that the thermal conductivity of aluminum foil is 237 W / (m*K), while the thermal conductivity of polypropylene foam is 0.035 W / (m*K). Clearly, the thermal conductivity of aluminum foil is much greater than that of polypropylene foam. Therefore, when air flows through the duct cavity 130, the excellent thermal conductivity of the aluminum foil rapidly directs the heat generated by the rotation of the impeller 200 to the airflow outlet 150. Experiments show that the temperature rise of the air inside the duct cavity 130 decreases from 4°C to below 2°C. According to the principle of thermal expansion and contraction, this causes the air density to increase, decreasing from 1.12 kg / m³. 3 Increased to 1.14 kg / m 3 This increases airflow, which in turn increases air volume and effectively improves the energy efficiency of the fan.

[0063] It is easy to understand that when the flexible covering layer is configured as other metal foils, the thermal conductivity of the metal foils is far superior to that of polypropylene foam materials, and it also has the technical effects that aluminum foil can achieve, which will not be elaborated here.

[0064] Understandably, in other implementations, the flexible covering layer may also be a polymer film, or a flexible covering layer may consist of a metal foil and a polymer film.

[0065] Reference Figure 1 and Figure 2 As shown, the volute 100 is provided with a third end wall 160, which is located outside the air duct cavity 130 and at the airflow outlet 150, and is arranged around the airflow outlet 150. Generally, the third end wall 160 is perpendicular to the airflow direction of the airflow outlet 150. The flexible covering layer extends towards the airflow direction at the airflow outlet 150 and covers the third end wall 160. Therefore, it effectively prevents the flexible covering layer from warping at the airflow outlet 150 and affecting airflow.

[0066] In addition, the flexible covering layer is configured as a metal foil, which can quickly direct the heat generated by the rotation of the impeller 200 to the outside of the airflow outlet 150, which is beneficial to further reduce the temperature rise of the air in the air duct cavity 130.

[0067] It is understood that the thickness of the flexible covering layer is 0.05mm to 0.3mm. In this embodiment, the thickness of the flexible covering layer is 0.1mm. Of course, the thickness of the flexible covering layer can also be 0.08mm, 0.2mm, etc. The flexible covering layer that meets the thickness range of 0.05mm to 0.3mm has good flexibility and is easy to bend, which helps to increase the fit between the flexible covering layer and the cavity wall of the air duct cavity 130, increase the contact area between the flexible covering layer and the cavity wall of the air duct cavity 130, thereby improving the installation stability of the flexible covering layer and reducing the weight.

[0068] Reference Figure 2 and Figure 3As shown, it can be understood that the sidewall 133 is provided with positioning ribs 134, and the flexible covering layer includes at least two surface structures. Specifically, in this embodiment, the sidewall 133 is provided with multiple positioning ribs 134. The positioning ribs 134 are arranged circumferentially along the impeller 200 and protrude from the cavity wall of the air duct cavity 130. The multiple positioning ribs 134 are arranged at equal intervals along the axial direction of the impeller 200. The number of surface structures of the flexible covering layer is one more than the number of positioning ribs 134. The multiple surface structures are arranged at intervals along the axial direction of the impeller 200, and the multiple positioning ribs 134 and the multiple surface structures are arranged alternately along the axial direction of the impeller 200. In this embodiment, the number of positioning ribs 134 is three. The two surface structures adjacent to the positioning ribs 134 respectively abut against the two sides of the positioning ribs 134 along the axial direction of the impeller 200. Therefore, by setting the positioning ribs 134 to position each surface structure, it is convenient to accurately attach the surface structure to the cavity wall of the air duct cavity 130. Meanwhile, by dividing the flexible overlay into multiple surface structures, each with a smaller area, the difficulty of adhesion can be reduced and the risk of wrinkles during adhesion can be decreased, thereby reducing the installation difficulty of the flexible overlay and improving efficiency.

[0069] Furthermore, it is easy to understand that since the positioning ribs 134 are arranged around the circumference of the impeller 200, the arrangement direction of the positioning ribs 134 is the same as the air flow direction at the side wall 133, which can reduce the influence of the positioning ribs 134 on the air flow.

[0070] It is understood that in other embodiments, the number of positioning ribs 134 may be one, two, four or more.

[0071] The heat pump device according to a second aspect of the present invention includes a heat exchanger and a fan according to a first aspect of the present invention.

[0072] Since the heat pump equipment adopts all the technical solutions of the fan in the above embodiments, it has at least all the beneficial effects brought about by the technical solutions in the above embodiments.

[0073] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A fan, characterized in that, include: A volute includes a first housing and a second housing, the first housing and the second housing being detachably connected and defining an air duct cavity, the volute having an airflow inlet and an airflow outlet, the airflow inlet and the airflow outlet respectively communicating with the air duct cavity; A wind turbine is installed inside the air duct cavity, with the air inlet of the wind turbine facing the airflow inlet and the air outlet of the wind turbine facing the airflow outlet. A flexible covering layer covers at least a portion of the cavity wall of the air duct cavity.

2. The fan according to claim 1, characterized in that: The cavity wall of the air duct includes a first end wall, a second end wall, and a side wall. The first end wall and the second end wall are located at the two ends of the wind turbine along the axial direction, respectively. The side wall is arranged around the rotation axis of the wind turbine and is connected to the first end wall and the second end wall. The flexible covering layer covers the first end wall, the second end wall, and the side wall.

3. The fan according to claim 2, characterized in that: The sidewall is provided with at least one positioning rib, which is arranged around the circumference of the wind turbine. The flexible cover layer includes at least two surface structures, which are arranged at intervals along the axial direction and abut against the positioning rib on both sides along the axial direction.

4. The fan according to claim 3, characterized in that: The number of positioning ribs is multiple, and the multiple positioning ribs are arranged at intervals along the axial direction, and the multiple positioning ribs and the multiple surface layer structures are arranged alternately along the axial direction.

5. The fan according to claim 1 or 2, characterized in that: The flexible covering layer is bonded to the cavity wall of the air duct cavity.

6. The fan according to claim 1 or 2, characterized in that: The flexible overlay is configured as at least one of a metal foil or a polymer film.

7. The fan according to claim 6, characterized in that: The volute is provided with a third end wall, which is located outside the air duct cavity and at the airflow outlet. The third end wall is arranged around the airflow outlet, and the flexible covering layer also covers the third end wall.

8. The fan according to claim 1 or 2, characterized in that: The roughness of the wall surface of the flexible covering layer facing the wind turbine is 0.1 μm to 0.5 μm.

9. The fan according to claim 1 or 2, characterized in that: The thickness of the flexible covering layer is 0.05mm to 0.3mm.

10. A heat pump device, characterized in that, It includes a housing and a fan as described in any one of claims 1 to 9, wherein the fan is mounted on the housing.

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