CN220302374U

CN220302374U - Fan assembly and water heater

Info

Publication number: CN220302374U
Application number: CN202322002394.1U
Authority: CN
Inventors: 荣光伟; 席晓琳; 黄朴; 黄志刚; 宋子文; 苏通; 梅欣桐
Original assignee: GD Midea Air Conditioning Equipment Co Ltd; Handan Midea Air Conditioning Equipment Co Ltd
Current assignee: GD Midea Air Conditioning Equipment Co Ltd; Handan Midea Air Conditioning Equipment Co Ltd
Priority date: 2023-07-27
Filing date: 2023-07-27
Publication date: 2024-01-05
Anticipated expiration: 2033-07-27

Abstract

The application discloses fan subassembly and water heater relates to domestic appliance technical field, wherein, the fan subassembly includes spiral case and wind wheel, the spiral case includes the volute tongue, first end wall, second end wall and circumference lateral wall, first end wall and second end wall set up in circumference lateral wall along axial opposite ends, first end wall is provided with the air intake, the volute tongue is connected with the one end of circumference lateral wall, the wind wheel sets up in the spiral case, use the line of the junction of center to volute tongue and circumference lateral wall of wind wheel as the reference line, use the contained angle between the ray of the center of wind wheel to the circumference profile of wind wheel and the reference line as the reference contained angle, in the scope of reference contained angle from 75 to 270, the length of the center of circumference lateral wall and wind wheel and the radius ratio of wind wheel increases gradually, and the ratio does not exceed 1.8. According to the method and the device, the size relation between the length of the center of the circumferential side wall and the center of the wind wheel and the radius of the wind wheel is associated, so that the circumferential side wall of the volute is reasonable in size, and occupation of space is reduced.

Description

Fan assembly and water heater

Technical Field

The application relates to the technical field of household appliances, in particular to a fan assembly and a water heater.

Background

In the related art, for example, in the field of household appliances, a centrifugal fan increases static pressure and reduces rotating speed by arranging a larger wind wheel, so that noise is reduced, however, the size of a volute is overlarge, the required installation space is increased, the miniaturization of the fan of a product is not facilitated, and the miniaturization of the whole product is also not facilitated.

Disclosure of Invention

In view of the foregoing, it is desirable to provide a fan assembly and a water heater that reduces the size of the volute.

To achieve the above object, an embodiment of the present application provides a fan assembly, including:

the volute comprises a volute tongue, a first end wall, a second end wall and a circumferential side wall, wherein the first end wall and the second end wall are arranged at two opposite ends of the circumferential side wall along the axial direction, the first end wall is provided with an air inlet, and the volute tongue is connected with one end of the circumferential side wall;

the wind wheel is arranged in the volute;

and taking a connecting line from the center of the wind wheel to the joint of the volute tongue and the circumferential side wall as a reference line, taking an included angle between a ray from the center of the wind wheel to the circumferential profile of the wind wheel and the reference line as a reference included angle, and gradually increasing the ratio of the length of the circumferential side wall to the center of the wind wheel to the radius of the wind wheel within the range of 75-270 degrees from the reference included angle, wherein the ratio is not more than 1.8.

In some embodiments, the maximum and minimum values of the ratio do not differ by more than 0.6.

In some embodiments, the ratio and the reference angle are non-linear over a range of from 75 ° to 270 °.

In some embodiments, the ratio is 1.05 to 1.3 at the location where the reference angle is 75 °.

In some embodiments, the ratio is 1.5 to 1.77 at the location where the reference angle is 270 °.

In some embodiments, the ratio remains the same over the range of the reference angle from 0 ° to 75 °, or the difference between the ratios at any two points does not exceed 0.05.

In some embodiments, the ratio of the outer dimension of the volute along a first straight line to the diameter of the wind wheel is 1.22-1.42, wherein the first straight line is: a straight line passing through the junction of the volute tongue and the circumferential side wall and the center of the wind wheel.

In some embodiments, the ratio of the outer dimension of the volute along a second line to the diameter of the wind wheel is 1.31-1.52, wherein the second line is: and a straight line passing through the center of the wind wheel and perpendicular to the first straight line.

In some embodiments, the fan assembly includes a motor disposed outside of the second end wall, a power output shaft of the motor passing through the second end wall and being connected to the wind wheel.

The embodiment of the application also provides a water heater, which comprises:

a water tank;

the heat pump system comprises an evaporator and a condenser, wherein the condenser is used for heating water in the water tank;

the fan assembly of any one of the above, wherein the fan assembly is disposed at one side of the evaporator, and is used for making air flow through the surface of the evaporator.

In some embodiments, the evaporator is disposed at one side of the air inlet of the volute, and the distance between the air inlet and the evaporator is 40 mm-120 mm along the axial direction of the volute.

In some embodiments, the heat pump system includes a compressor, the evaporator, the compressor, and the fan assembly are all disposed on a top side of the water tank, and the condenser surrounds a peripheral side of the water tank.

The fan assembly that this embodiment provided uses the line of the junction of center to volute tongue and circumference lateral wall of wind wheel as the reference line, uses the contained angle between the radial of the circumference profile of center to wind wheel and the reference line of wind wheel as the reference contained angle, in the range of reference contained angle from 70 to 270, the ratio of the length of circumference lateral wall and center of wind wheel and the radius of wind wheel increases gradually, and the ratio is no more than 1.8. According to the method, the length of the center of the peripheral side wall and the wind wheel and the size relation of the radius of the wind wheel are related, so that the size of the peripheral side wall of the volute is reasonable, occupation of space is reduced, in addition, the maximum value of the ratio is not more than 1.8, the size of the peripheral side wall of the volute at the maximum position of the ratio is not too large, wind power is more concentrated, and under the condition that the rotating speed of the wind wheel is unchanged, the wind pressure between the peripheral side wall of the volute and the wind wheel is increased, that is, under the condition that the wind quantity and the wind pressure of the same size are required, the rotating speed of the wind wheel can be reduced, and therefore the purpose of noise reduction is achieved.

Drawings

Fig. 1 is a schematic structural diagram of a fan assembly according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of the structure of FIG. 1 from another perspective;

FIG. 3 is a schematic view of the structure of FIG. 1 from another perspective;

FIG. 4 is a schematic view of the structure of FIG. 1 from another view;

fig. 5 is a schematic view of a volute profile according to an embodiment of the present disclosure;

fig. 6 is a schematic view of another volute profile provided in an embodiment of the present application.

Description of the reference numerals

A fan assembly 10; a reference line 10a; a reference angle 10b;

a volute 1; an air outlet 1a; volute tongue 11; a first end wall 12; an air inlet 12a; a second end wall 13; a circumferential side wall 14; a wind wheel 2; a motor 3; and a partition plate 4.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and technical features in the embodiments may be combined with each other, and the detailed description in the specific embodiments should be interpreted as an explanation of the gist of the present application and should not be construed as undue limitation to the present application.

The present application will now be described in further detail with reference to the accompanying drawings and specific examples. In the description of the present application, the terms "inner," "outer," and the like are based on the normal use of the fan assembly, and it is to be understood that these terms are merely used for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. In the description of the embodiments of the present application, the meaning of "plurality" is at least two, i.e., including two and more, for example, two or three, etc., unless explicitly defined otherwise.

The embodiment of the present application provides a fan assembly 10, please refer to fig. 1 to 4, including a volute 1 and a wind wheel 2.

The operational scenario of the fan assembly 10 is not limited. Illustratively, the blower assembly 10 can be used in heating, ventilation and air conditioning systems, for example, to push air through ventilation ducts, regulate indoor air quality and temperature, and ensure even distribution of air flow; illustratively, the blower assembly 10 can also be used in air purification systems and filtration devices to provide a clean air environment by pushing air through a filter to remove suspended particles, bacteria, and contaminants.

The volute 1 comprises a volute tongue 11, a first end wall 12, a second end wall 13 and a circumferential side wall 14, wherein the first end wall 12 and the second end wall 13 are arranged at two opposite ends of the circumferential side wall 14 along the axial direction, the first end wall 12 is provided with an air inlet 12a, and the volute tongue 11 is connected with one end of the circumferential side wall 14.

The wind wheel 2 is arranged in the volute 1.

The position of the air intake 12a in the first end wall 12 is not limited. Illustratively, at least 80% of the projection of the rotor 2 onto the first end wall 12 is located within the inlet 12 a. That is, the air inlet 12a and the wind wheel 2 have proper sizes, so that air is sucked from the air inlet 12a more smoothly when the wind wheel 2 assembly works, the resistance of the first end wall 12 to the air is reduced, and noise pollution is reduced.

It will be appreciated that the volute 1 is provided with an air outlet 1a to achieve an air outlet function. Illustratively, the circumferential side wall 14, the first end wall 12, the second end wall 13 and the volute tongue 11 enclose the air outlet 1a. That is, the air outlet 1a is disposed at an end of the volute tongue 11 away from the circumferential end wall. Like this, during operation of wind wheel 2 subassembly, wind wheel 2 rotation forms negative pressure suction air at air intake 12a, and circumference end wall is connected with volute tongue 11, and volute tongue 11 and air outlet 1a smooth transition reduces the windage, and the air flows from air outlet 1a along volute tongue 11 from circumference end wall, and the air-out is smooth and easy, has reduced air outlet 1a noise, has reduced noise pollution.

The connecting line from the center of the wind wheel 2 to the connection point of the volute tongue 11 and the circumferential side wall 14 is taken as a reference line 10a, the included angle between the radial line from the center of the wind wheel 2 to the circumferential profile of the wind wheel 2 and the reference line 10a is taken as a reference included angle 10b, and the ratio of the length of the circumferential side wall 14 and the center of the wind wheel 2 to the radius of the wind wheel 2 is gradually increased within the range of the reference included angle 10b from 70 degrees to 270 degrees and is not more than 1.8.

The center of the wind wheel 2 refers to the rotation center of the wind wheel 2. Illustratively, the wind wheel 2 is circular, and the center of the wind wheel 2 is the center of the circle.

It will be appreciated that there are a plurality of rays from the centre of the rotor 2 to the circumferential profile of the rotor 2, each forming a plurality of reference angles 10b with the reference line 10 a.

The radius of the wind wheel 2 refers to the outer diameter of the wind wheel 2.

Illustratively, the ratio of the length of the circumferential side wall 14 to the centre of the rotor 2 to the radius of the rotor 2 may be 1.08, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7 or 1.8, etc. in the range of the reference angle 10b from 70 ° to 270 °.

In the related art, a fan assembly needs to design a larger centrifugal wind wheel to improve static pressure and reduce rotating speed so as to reduce noise, but the appearance line of the peripheral side wall of the volute adopts design methods such as an Archimedes curve, a logarithmic spiral line and the like, and a plurality of sections of circular arcs are adopted to draw a fitting spiral line or the Archimedes curve to approximate the appearance line of the peripheral side wall of the volute, so that the size of the peripheral side wall of the volute is larger and the space is occupied for matching the arrangement of the centrifugal wind wheel.

The fan assembly 10 of this application embodiment is through the length of the center of associative circumference lateral wall 14 and wind wheel 2 and the radial size relation of wind wheel 2 for the circumference lateral wall 14 size setting of spiral case 1 is reasonable, has reduced occupation to the space, in addition, the maximum value setting of ratio is not more than 1.8, and the circumference lateral wall 14 size of spiral case 1 of the biggest department of ratio can not set up too big, and wind-force is more concentrated, makes the wind pressure increase between the circumference lateral wall 14 of spiral case 1 and wind wheel 2 of wind wheel 2 under the unchangeable circumstances of wind volume, the wind pressure demand condition of same size, this application can reduce the rotational speed of wind wheel 2, thereby reaches the purpose of noise reduction.

Referring to fig. 6, in the schematic outline diagram of the volute 1 shown in fig. 6, rw refers to a radius of the wind wheel 2, point P refers to any point on the circumferential side wall 14, α refers to a reference angle 10b, point O refers to a center of the wind wheel 2, and R refers to a length of OP, where R refers to a length of the center of the circumferential side wall 14 and the wind wheel 2, and the reference line 10a is a Y axis, a straight line perpendicular to the reference line 10a and passing through the point O is an X axis, and a rectangular coordinate system shown in fig. 6 is established. That is, in the rectangular coordinate system, the ratio of R to Rw does not exceed 1.8 in the range from 70 ° to 270 °.

With continued reference to fig. 6, the dashed line on the outermost side of the circumferential sidewall 14 in fig. 6 refers to the contour line of the circumferential sidewall 14 when the ratio of R to Rw is the maximum.

In some embodiments, the difference between the maximum and minimum values of the ratio is no more than 0.6.

Illustratively, the difference between the maximum and minimum values of the ratio may be 0.2, 0.3, 0.4, 0.5, or 0.6, etc. For example, if the maximum value of the ratio is 1.8, the minimum value of the ratio is not less than 1.2.

In this way, the maximum value and the minimum value of the ratio are controlled within a reasonable range, and then the difference between the maximum value and the minimum value of the size of the circumferential side wall 14 of the volute 1 is controlled within a reasonable range, that is, the size change of the circumferential side wall 14 of the volute 1 is small, the circumferential side wall 14 is in smooth transition as a whole, the wind resistance is reduced, and then the noise pollution is reduced.

In some embodiments, the ratio and the reference angle 10b are non-linear over a range of reference angles 10b from 75 ° to 270 °.

The nonlinear relationship means that the ratio is not proportional to the reference angle 10b.

In the related art, the ratio and the reference included angle are in a linear relation, and the circumferential side wall of the volute is an archimedes spiral, that is, the size of the circumferential side wall is increased at a constant speed. In this embodiment, by setting the ratio and the reference angle 10b to a nonlinear relationship, the rate of increase in the size of the circumferential side wall 14 can be retarded, thereby reducing the size of the circumferential side wall 14.

In some embodiments, the ratio is 1.05 to 1.3 at the location where the reference angle 10b is 75 °.

Illustratively, the ratio may be 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, or the like.

In this embodiment, the ratio of the length of the center of the circumferential side wall 14 and the wind wheel 2 to the radius of the wind wheel 2 is set to 1.05-1.3 at the position where the reference included angle 10b is 75 degrees, after a specific model of wind wheel 2 is selected, the length of the center of the circumferential side wall 14 and the wind wheel 2 is set reasonably, and the fan assembly 10 can reduce the size of the circumferential side wall 14 of the volute 1, reduce the occupation of space and reduce the manufacturing cost on the premise of not reducing the performance and not improving the noise pollution.

In other embodiments, the ratio is 1.5 to 1.77 at the reference angle 10b of 270 °.

Illustratively, the ratio may be 1.5, 1.55, 1.6, 1.65, 1.7, 1.75, or 1.77, etc.

In this embodiment, the ratio of the length of the center of the circumferential side wall 14 and the wind wheel 2 to the radius of the wind wheel 2 is set to 1.5-1.77 at the position where the reference included angle 10b is 270 degrees, after a specific model of wind wheel 2 is selected, the length of the center of the circumferential side wall 14 and the wind wheel 2 is set reasonably, and the fan assembly 10 can reduce the size of the circumferential side wall 14 of the volute 1, reduce the occupation of space and reduce the manufacturing cost on the premise of not reducing the performance and not improving the noise pollution.

With continued reference to fig. 6, the dashed line on the innermost side of the circumferential sidewall 14 in fig. 6 refers to the contour line of the circumferential sidewall 14 when the ratio of R to Rw is the minimum, and the dashed line in the middle of the two dashed lines in fig. 6 refers to the volute 1 when the ratio of R to Rw corresponding to the dashed line is the minimum, and the performance and noise reduction effect of the volute 1 are best.

In some embodiments, the ratio remains the same over the range of reference angle 10b from 0 ° to 75 °, or the difference between the corresponding ratios at any two points does not exceed 0.05.

It should be noted that the ratio remains unchanged, and that the dimensions of the circumferential side wall 14 of the volute 1 are the same in the range of the reference angle 10b from 0 ° to 75 °.

Illustratively, the difference in the ratio between any two points may be 0.01, 0.02, 0.03, 0.04, 0.05, or the like.

In this way, in the range of the reference included angle 10b from 0 ° to 75 °, the dimensional variation of the circumferential side wall 14 of the volute 1 is small, the circumferential side wall 14 is smoothly transited as a whole, the wind resistance is reduced, and further the noise pollution is reduced.

In some embodiments, the ratio of the outer dimension of the volute 1 along the first straight line to the diameter of the wind wheel 2 is 1.22-1.42, where the first straight line is: a straight line passing through the junction of the volute tongue 11 and the circumferential side wall 14 and the centre of the rotor 2.

For example, the ratio of the outer dimension of the volute 1 along the first straight line to the diameter of the wind wheel 2 may be 1.22, 1.24, 1.26, 1.28, 1.3, 1.32, 1.35, 1.40, 1.41 or 1.42, etc.

For example, the diameter of the wind wheel 2 is 264mm, the ratio of the outer dimension of the volute 1 along the first straight line to the diameter of the wind wheel 2 is 1.286, and the outer dimension of the volute 1 along the first straight line is 339.504mm.

The outer dimension of the scroll casing 1 along the first straight line refers to the dimension of the line connecting the two intersections of the first straight line and the circumferential side wall 14. It will be appreciated that one of the points of intersection is the point of attachment of the volute tongue 11 to the circumferential side wall 14.

In this embodiment, the ratio of the outer dimension of the volute 1 along the first straight line to the diameter of the wind wheel 2 is set to 1.22-1.42, after a specific model of wind wheel 2 is selected, the outer dimension of the volute 1 along the first straight line is set reasonably, and the fan assembly 10 can reduce the dimension of the circumferential side wall 14 of the volute 1, reduce the occupation of space and reduce the manufacturing cost on the premise of not reducing the performance and not improving the noise pollution.

In some embodiments, the ratio of the outer dimension of the volute 1 along the second line to the diameter of the wind wheel 2 is 1.31-1.52, where the second line is: a straight line passing through the center of the wind wheel 2 and perpendicular to the first straight line.

For example, the ratio of the outer dimension of the volute 1 along the second straight line to the diameter of the wind wheel 2 may be 1.31, 1.33, 1.35, 1.37, 1.39, 1.43, 1.47, 1.5, 1.51 or 1.52, etc.

For example, the diameter of the wind wheel 2 is 264mm, the ratio of the outer dimension of the volute 1 along the second straight line to the diameter of the wind wheel 2 is 1.38, and the outer dimension of the volute 1 along the first straight line is 364.32mm.

The outer dimension of the scroll casing 1 along the second straight line refers to the dimension of the line connecting the two intersections of the second straight line and the circumferential side wall 14.

In this embodiment, the ratio of the outer dimension of the volute 1 along the second straight line to the diameter of the wind wheel 2 is set to 1.31-1.52, after a specific model of wind wheel 2 is selected, the outer dimension of the volute 1 along the second straight line is set reasonably, and the fan assembly 10 can reduce the dimension of the circumferential side wall 14 of the volute 1, reduce the occupation of space and reduce the manufacturing cost on the premise of not reducing the performance and not improving the noise pollution.

For example, referring to fig. 5, the outer dimension of the volute 1 along the first line is D1, and the outer dimension of the volute 1 along the second line is D2.

The manner in which the rotor 2 is driven to rotate is not limited.

Illustratively, the fan assembly 10 includes a motor 3.

That is, the motor 3 is fixedly installed on the volute 1 and connected to the wind wheel 2 to drive the wind wheel 2 to rotate, thereby generating air flow and sucking air through the air inlet 12 a.

The installation position of the motor 3 is not limited.

In some embodiments, the motor 3 is disposed on the first end wall 12, and a power output shaft of the motor 3 is connected to the wind wheel 2.

In other embodiments, referring to fig. 1 to 4, the motor 3 is disposed outside the second end wall 13, and the power output shaft of the motor 3 passes through the second end wall 13 and is connected to the wind wheel 2. In this embodiment, the motor 3 is disposed away from the air inlet 12a, so that the air inlet resistance of the air inlet 12a is reduced, and the wind resistance and noise caused by the motor 3 are reduced.

Illustratively, referring to fig. 1, the fan assembly 10 includes a partition plate 4, the partition plate 4 being disposed within the volute 1 and separating the wind wheel 2 and the motor 3. Therefore, the motor 3 and the wind wheel 2 are isolated, the contact between the air flow and the motor 3 is reduced, and the service life of the motor 3 is prolonged.

Embodiments of the present application also provide a water heater including a water tank, a heat pump system, and the fan assembly 10 of any of the above embodiments.

The heat pump system includes an evaporator and a condenser for heating water in the water tank.

The fan assembly 10 is disposed on one side of the evaporator for directing air across the evaporator surface.

It is understood that the evaporator stores refrigerant, which can absorb heat in air and evaporate, and the refrigerant is transferred to the condenser through the heat pump system, so that the water in the water tank is heated through the condenser.

It will be appreciated that after the air flows over the evaporator surface, the refrigerant absorbs heat from the air, the temperature of the air is reduced, and the fan assembly 10 is capable of absorbing the reduced temperature air and generating an airflow, so that the evaporator surface is capable of flowing over the air which is not absorbed heat by the refrigerant, thereby improving the heat absorption efficiency of the evaporator.

In some embodiments, the evaporator is disposed on one side of the air inlet 12a of the volute 1.

That is, by providing the evaporator at one side of the air inlet 12a of the scroll case 1, the amount of air flowing through the evaporator is increased, and the air having heat absorbed by the refrigerant is difficult to stagnate on the surface of the evaporator, so that the surface of the evaporator can continuously flow through the air having no heat absorbed by the refrigerant, thereby improving the heat absorption efficiency.

The distance between the air inlet 12a and the evaporator is 40 mm-120 mm along the axial direction of the volute 1.

Illustratively, the air intake 12a may be 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 82mm, 84mm, 86mm, 88mm, 90mm, 93mm, 96mm, 99mm, 100mm, 105mm, 110mm, 115mm, 120mm, or the like from the evaporator.

In this embodiment, the distance between the air inlet 12a and the evaporator is set to 40 mm-120 mm, so that the wind field formed between the air inlet 12a and the evaporator is more uniform, and the heat absorption efficiency of the evaporator is improved.

In some embodiments, the heat pump system includes a compressor, an evaporator, a compressor and a fan assembly 10 are all disposed on the top side of the water tank, and a condenser surrounds the perimeter side of the water tank.

The specific structure of the condenser is not limited. Illustratively, the condenser may be a copper tube or an aluminum microchannel, or the like.

Illustratively, the water heater operates on the following principle: in the working process of the fan assembly 10, air flows through the surface of the evaporator, heat exchange is carried out on the air through the evaporator, the air with reduced temperature is discharged by the fan assembly 10, meanwhile, refrigerant in the evaporator absorbs heat and is vaporized and sucked into the compressor, the compressor compresses gas vaporized by the refrigerant into high-temperature and high-pressure gas to be sent into the condenser, the high-temperature and high-pressure gas can be converted into a liquefied state from a gasified state, and a large amount of heat can be released in the conversion process, so that water in the water tank is heated.

Illustratively, the water heater includes a housing disposed on a top side of the water tank, the evaporator, compressor and fan assembly 10 are all disposed within the housing, the housing has a suction inlet and a discharge outlet, and the air outlet 1a of the volute 1 communicates with the discharge outlet.

Illustratively, the water heater operates on the following principle: in the working process of the fan assembly 10, gas in the shell is discharged out of the shell through the air outlet 1a and the exhaust outlet, negative pressure is formed in the shell, external air enters the shell from the suction inlet, air flows through the surface of the evaporator, heat exchange is carried out on the air through the evaporator, the air with reduced temperature is discharged out of the shell through the exhaust outlet by the fan assembly 10, meanwhile, refrigerant in the evaporator absorbs heat and is vaporized and is sucked into the compressor, the compressor compresses the gas vaporized by the refrigerant into high-temperature and high-pressure gas, the high-temperature and high-pressure gas is sent into the condenser, the high-temperature and high-pressure gas can be converted into a liquefied state from a vaporized state, a large amount of heat can be released in the conversion process, and water in the water tank is heated.

In the description of the present application, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present application. In this application, the schematic representations of the above terms are not necessarily for the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the various embodiments or examples described herein, as well as the features of the various embodiments or examples, may be combined by those skilled in the art without contradiction.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A fan assembly, comprising:

the wind wheel is arranged in the volute;

2. The fan assembly of claim 1 wherein the maximum and minimum values of the ratio differ by no more than 0.6.

3. The fan assembly of claim 1 wherein the ratio and the reference included angle are non-linear over the range of from 75 ° to 270 °.

4. The fan assembly of claim 1 wherein the ratio is 1.05 to 1.3 at the reference angle of 75 °.

5. The fan assembly of claim 1 wherein the ratio is 1.5 to 1.77 at the reference angle of 270 °.

6. The fan assembly of claim 1 wherein the ratio remains the same over the range of the reference angle from 0 ° to 75 °, or the difference between the ratios at any two points does not exceed 0.05.

7. The fan assembly of claim 1, wherein a ratio of an outer dimension of the volute along a first line to a diameter of the rotor is 1.22-1.42, wherein the first line is: a straight line passing through the junction of the volute tongue and the circumferential side wall and the center of the wind wheel.

8. The fan assembly of claim 7, wherein a ratio of an outer dimension of the volute along a second line to a diameter of the rotor is 1.31-1.52, wherein the second line is: and a straight line passing through the center of the wind wheel and perpendicular to the first straight line.

9. The fan assembly of claim 1, comprising a motor disposed outside of the second end wall, a power output shaft of the motor passing through the second end wall and being connected to the wind wheel.

10. A water heater, comprising:

a water tank;

the fan assembly of any of claims 1-9, disposed on a side of the evaporator for passing air over the evaporator surface.

11. The water heater of claim 10, wherein the evaporator is disposed at one side of the air inlet of the scroll case, and a distance between the air inlet and the evaporator is 40 mm-120 mm along an axial direction of the scroll case.

12. The water heater of claim 10, wherein the heat pump system includes a compressor, the evaporator, the compressor, and the fan assembly are all disposed on a top side of the water tank, and the condenser surrounds a peripheral side of the water tank.