Fan assembly and water heater

Abstract

The invention discloses a fan assembly and a water heater, and relates to the technical field of household appliances, the fan assembly comprises a volute and a wind wheel, the volute comprises a volute tongue, a first end wall, a second end wall and a circumferential side wall, the first end wall and the second end wall are arranged at the two opposite ends of the circumferential side wall in the axial direction, the first end wall is provided with an air inlet, and the second end wall is provided with an air outlet; the volute tongue is connected with one end of the circumferential side wall, the wind wheel is arranged in the volute, a connecting line from the center of the wind wheel to the connecting position of the volute tongue and the circumferential side wall serves as a reference line, an included angle between a ray from the center of the wind wheel to the circumferential contour of the wind wheel and the reference line serves as a reference included angle, and the included angle ranges from 75 degrees to 270 degrees. The ratio of the length of the circumferential side wall to the center of the wind wheel to the radius of the wind wheel is gradually increased and does not exceed 1.8. According to the volute, the size of the circumferential side wall of the volute is reasonably set by associating the size relation between the length of the circumferential side wall and the center of the wind wheel and the radius of the wind wheel, and occupied space is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of household appliances, and in particular to a fan assembly and a water heater. Background Art

[0002] In the related art, for example, in the field of household appliances, centrifugal fans increase static pressure and reduce rotation speed by setting a larger wind wheel, thereby reducing noise. However, the volute size is too large, and the required installation space increases, which is not conducive to the miniaturization of the fan of the product, nor is it conducive to the miniaturization of the entire product. Summary of the invention

[0003] In view of this, embodiments of the present application hope to provide a fan assembly and a water heater to reduce the size of the volute.

[0004] To achieve the above object, an embodiment of the present application provides a fan assembly, including:

[0005] A volute, comprising 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 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 to one end of the circumferential side wall;

[0006] A wind wheel is arranged in the volute;

[0007] A line from the center of the wind wheel to the connection between the volute tongue and the circumferential side wall is taken as a reference line, and an angle between a ray from the center of the wind wheel to the circumferential contour of the wind wheel and the reference line is taken as a reference angle. Within the range of the reference angle from 75° to 270°, the ratio of the length of the circumferential side wall to the center of the wind wheel to the radius of the wind wheel gradually increases, and the ratio does not exceed 1.8.

[0008] In some embodiments, the difference between the maximum and minimum values ​​of the ratio does not exceed 0.6.

[0009] In some embodiments, when the reference angle ranges from 75° to 270°, the ratio and the reference angle are nonlinearly related.

[0010] In some embodiments, at a position where the reference angle is 75°, the ratio is 1.05 to 1.3.

[0011] In some embodiments, at a position where the reference angle is 270°, the ratio is 1.5 to 1.77.

[0012] In some embodiments, within the range of the reference angle from 0° to 75°, the ratio remains unchanged, or the difference between any two corresponding ratios does not exceed 0.05.

[0013] In some embodiments, the ratio of the outer contour dimension of the volute along the 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 connection between the volute tongue and the circumferential side wall and the center of the wind wheel.

[0014] In some embodiments, the ratio of the outer contour dimension of the volute along the second straight line to the diameter of the wind wheel is 1.31-1.52, wherein the second straight line is a straight line passing through the center of the wind wheel and perpendicular to the first straight line.

[0015] In some embodiments, the fan assembly includes a motor, which is disposed on the outside of the second end wall, and a power output shaft of the motor passes through the second end wall and is connected to the wind wheel.

[0016] The present application also provides a water heater, including:

[0017] Water tank;

[0018] A heat pump system, comprising an evaporator and a condenser, wherein the condenser is used to heat the water in the water tank;

[0019] The fan assembly described in any one of the above is arranged on one side of the evaporator to allow air to flow through the surface of the evaporator.

[0020] In some embodiments, the evaporator is disposed on one side of the air inlet of the volute, and along the axial direction of the volute, the distance between the air inlet and the evaporator is 40 mm to 120 mm.

[0021] In some embodiments, the heat pump system includes a compressor, the evaporator, the compressor, and the fan assembly are all disposed on the top side of the water tank, and the condenser surrounds the circumference of the water tank.

[0022] The fan assembly provided by the embodiment of the present application takes the line from the center of the wind wheel to the connection between the volute tongue and the circumferential side wall as the reference line, and takes the angle between the ray from the center of the wind wheel to the circumferential contour of the wind wheel and the reference line as the reference angle. In the range of the reference angle from 70° to 270°, the ratio of the length of the circumferential side wall to the center of the wind wheel to the radius of the wind wheel gradually increases, and the ratio does not exceed 1.8. The present application makes the circumferential side wall size of the volute reasonable by associating the length of the circumferential side wall to the center of the wind wheel and the radius of the wind wheel, thereby reducing the space occupied. In addition, the maximum value of the ratio is set to no more than 1.8, and the circumferential side wall size of the volute at the maximum ratio is not set too large, and the wind force is more concentrated, so that when the speed of the wind wheel remains unchanged, the wind pressure between the circumferential side wall of the volute of the present application and the wind wheel increases. That is to say, under the same wind volume and wind pressure requirements, the present application can reduce the speed of the wind wheel, thereby achieving the purpose of reducing noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of a fan assembly provided in an embodiment of the present application;

[0024] Figure 2 for Figure 1 Schematic diagram of the structure from another perspective;

[0025] Figure 3 for Figure 1 A schematic diagram of the structure from another perspective;

[0026] Figure 4 for Figure 1 A schematic diagram of the structure from another perspective;

[0027] Figure 5 A schematic diagram of a volute profile provided in an embodiment of the present application;

[0028] Figure 6 A schematic diagram of another volute profile provided in an embodiment of the present application.

[0029] Description of Reference Numerals

[0030] Fan assembly 10; reference line 10a; reference angle 10b;

[0031] The volute 1 comprises an air outlet 1a, a 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

[0032] It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of the present application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of the present application and should not be regarded as an improper limitation on the present application.

[0033] The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. In the description of the present application, the orientations or positional relationships such as "inside" and "outside" are based on the orientations or positional relationships when the fan assembly is in normal use. It should be understood that these orientation terms are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In the description of the embodiments of the present application, the meaning of "multiple" is at least two, that is, including two and more than two, such as two or three, etc., unless otherwise clearly and specifically defined.

[0034] The present application embodiment provides a fan assembly 10, please refer to Figures 1 to 4 , including a volute 1 and a wind wheel 2.

[0035] The fan assembly 10 can be used in any application scenario. For example, the fan assembly 10 can be used in a heating, ventilation and air conditioning system, for example, it can be used to push air through a ventilation duct, adjust indoor air quality and temperature, and ensure uniform distribution of air flow; for example, the fan assembly 10 can also be used in an air purification system and a filtering device, by pushing air through a filter to remove suspended particles, bacteria and pollutants, and provide a clean air environment.

[0036] The volute 1 includes a volute tongue 11, a first end wall 12, a second end wall 13 and a circumferential side wall 14. The first end wall 12 and the second end wall 13 are arranged at 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 to one end of the circumferential side wall 14.

[0037] The wind wheel 2 is arranged in the volute 1 .

[0038] The location of the air inlet 12a on the first end wall 12 is not limited. For example, at least 80% of the projection of the wind wheel 2 on the first end wall 12 is located in the air inlet 12a. In other words, the air inlet 12a and the wind wheel 2 have appropriate sizes, and when the wind wheel 2 assembly is working, air is sucked in more smoothly from the air inlet 12a, reducing the resistance of the first end wall 12 to the air and reducing noise pollution.

[0039] It is understandable that the volute 1 is provided with an air outlet 1a to realize the air outlet function. Exemplarily, the circumferential side wall 14, the first end wall 12, the second end wall 13 and the volute tongue 11 surround the air outlet 1a. That is to say, the air outlet 1a is arranged at the end of the volute tongue 11 away from the circumferential end wall. In this way, when the wind wheel 2 assembly is working, the wind wheel 2 rotates to form a negative pressure to inhale air at the air inlet 12a, the circumferential end wall is connected to the volute tongue 11, and the volute tongue 11 and the air outlet 1a have a smooth transition to reduce wind resistance, and the air flows out from the circumferential end wall along the volute tongue 11 from the air outlet 1a, the air outlet is smooth, the noise of the air outlet 1a is reduced, and the noise pollution is reduced.

[0040] A line from the center of the wind rotor 2 to the connection between the volute tongue 11 and the circumferential side wall 14 is taken as a reference line 10a, and an angle between a ray from the center of the wind rotor 2 to the circumferential contour of the wind rotor 2 and the reference line 10a is taken as a reference angle 10b. Within the range of the reference angle 10b from 70° to 270°, the ratio of the length of the circumferential side wall 14 and the center of the wind rotor 2 to the radius of the wind rotor 2 gradually increases, and the ratio does not exceed 1.8.

[0041] The center of the wind rotor 2 refers to the rotation center of the wind rotor 2. Exemplarily, the wind rotor 2 is circular, and the center of the wind rotor 2 is the center of the circle.

[0042] It can be understood that there are multiple rays from the center of the wind rotor 2 to the circumferential contour of the wind rotor 2, and the multiple rays form multiple reference angles 10b with the reference line 10a respectively.

[0043] The radius of the wind wheel 2 refers to the outer diameter of the wind wheel 2 .

[0044] Exemplarily, within the range of reference angle 10b from 70° to 270°, 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 can be 1.08, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7 or 1.8, etc.

[0045] In the related art, the fan assembly needs to be designed with a larger centrifugal wind wheel to increase the static pressure, reduce the rotation speed, and thus reduce the noise. However, the outer profile of the circumferential side wall of the volute is designed using Archimedean curves, logarithmic spirals, and other design methods. Multiple arcs are used to draw fitting spirals or Archimedean curves to approximate the outer profile of the circumferential side wall of the volute. In order to match the setting of the centrifugal wind wheel, the circumferential side wall of the volute is larger in size, which takes up space.

[0046] The fan assembly 10 of the embodiment of the present application makes the size of the circumferential side wall 14 of the volute 1 reasonably set by associating the dimensional relationship between the length of the circumferential side wall 14 and the center of the wind wheel 2 and the radius of the wind wheel 2, thereby reducing the space occupied. In addition, the maximum value of the ratio is set to no more than 1.8, the size of the circumferential side wall 14 of the volute 1 at the maximum ratio is not set too large, and the wind force is more concentrated, so that when the rotation speed of the wind wheel 2 remains unchanged, the wind pressure between the circumferential side wall 14 of the volute 1 of the present application and the wind wheel 2 increases. That is to say, under the same air volume and wind pressure requirements, the present application can reduce the rotation speed of the wind wheel 2, thereby achieving the purpose of reducing noise.

[0047] For example, please refer to Figure 6 , Figure 6 In the schematic diagram of the volute 1 profile shown, Rw refers to the radius of the wind rotor 2, point P refers to any point on the circumferential side wall 14, α refers to the reference angle 10b, point O refers to the center of the wind rotor 2, R is the length of OP, and R refers to the length between the circumferential side wall 14 and the center of the wind rotor 2. The following can be established with point O as the origin, reference line 10a as the Y axis, and a straight line perpendicular to the reference line 10a and passing through point O as the X axis: Figure 6 That is to say, in the rectangular coordinate system, within the range from 70° to 270°, the ratio of R to Rw does not exceed 1.8.

[0048] Please continue to refer to Figure 6 , Figure 6 The outermost dashed line of the middle circumferential side wall 14 refers to the contour line of the circumferential side wall 14 when the ratio of R to Rw is at the maximum value.

[0049] In some embodiments, the difference between the maximum and minimum values ​​of the ratio does not exceed 0.6.

[0050] Exemplarily, the difference between the maximum value and the minimum value 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.

[0051] In this way, the maximum and minimum values ​​of the ratio are controlled within a reasonable range, and the difference between the maximum and minimum values ​​of the size of the circumferential side wall 14 of the volute 1 is thereby controlled within a reasonable range. That is to say, the size of the circumferential side wall 14 of the volute 1 changes little, and the circumferential side wall 14 has an overall smooth transition, thereby reducing wind resistance and thereby reducing noise pollution.

[0052] In some embodiments, when the reference angle 10b ranges from 75° to 270°, the ratio and the reference angle 10b are in a nonlinear relationship.

[0053] The non-linear relationship refers to a non-proportional relationship between the ratio and the reference angle 10b.

[0054] In the related art, there is a linear relationship between the ratio and the reference angle, and the circumferential side wall of the volute is an Archimedean spiral, that is, the size of the circumferential side wall increases at a constant speed. In this embodiment, by setting the ratio and the reference angle 10b to a nonlinear relationship, the growth rate of the size of the circumferential side wall 14 can be slowed down, thereby reducing the size of the circumferential side wall 14.

[0055] In some embodiments, when the reference angle 10b is 75°, the ratio is 1.05-1.3.

[0056] Illustratively, the ratio may be 1.05, 1.1, 1.15, 1.2, 1.25 or 1.3, etc.

[0057] In this embodiment, 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 set to 1.05-1.3 at a position where the reference angle 10b is 75°. After selecting a specific model of the wind wheel 2, the length of the circumferential side wall 14 and the center of the wind wheel 2 is set more reasonably. The fan assembly 10 can reduce the size of the circumferential side wall 14 of the volute 1 without reducing performance or increasing noise pollution, thereby reducing space occupancy and manufacturing costs.

[0058] In some other embodiments, when the reference angle 10b is 270°, the ratio is 1.5-1.77.

[0059] Illustratively, the ratio may be 1.5, 1.55, 1.6, 1.65, 1.7, 1.75 or 1.77, etc.

[0060] In this embodiment, 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 set to 1.5-1.77 at a position where the reference angle 10b is 270°. After selecting a specific model of the wind wheel 2, the length of the circumferential side wall 14 and the center of the wind wheel 2 is set more reasonably. The fan assembly 10 can reduce the size of the circumferential side wall 14 of the volute 1 without reducing performance or increasing noise pollution, thereby reducing space occupancy and manufacturing costs.

[0061] Please continue to refer to Figure 6 , Figure 6 The innermost dotted line of the circumferential side wall 14 refers to the contour line of the circumferential side wall 14 when the ratio of R to Rw is the minimum. Figure 6 The dotted line located between the two dotted lines refers to the volute 1 that meets the ratio of R to Rw corresponding to the dotted line. The performance and noise reduction effect of the volute 1 are the best.

[0062] In some embodiments, within the range of the reference angle 10b from 0° to 75°, the ratio remains unchanged, or the difference between any two corresponding ratios does not exceed 0.05.

[0063] It should be noted that the ratio remains unchanged means that within the range of the reference angle 10b from 0° to 75°, the size of the circumferential side wall 14 of the volute 1 is the same.

[0064] Exemplarily, the difference between any two corresponding ratios may be 0.01, 0.02, 0.03, 0.04 or 0.05, etc.

[0065] Thus, within the range of the reference angle 10b from 0° to 75°, the size variation of the circumferential side wall 14 of the volute 1 is small, and the circumferential side wall 14 has an overall smooth transition, which reduces wind resistance and further reduces noise pollution.

[0066] In some embodiments, the ratio of the outer contour dimension of the volute 1 along the first straight line to the diameter of the wind wheel 2 is 1.22-1.42, wherein the first straight line is a straight line passing through the connection between the volute tongue 11 and the circumferential side wall 14 and the center of the wind wheel 2.

[0067] Exemplarily, the ratio of the outer contour 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.

[0068] For example, the diameter of the wind wheel 2 is 264 mm, the ratio of the outer contour dimension of the volute 1 along the first straight line to the diameter of the wind wheel 2 is 1.286, and the outer contour dimension of the volute 1 along the first straight line is 339.504 mm.

[0069] It should be noted that the outer contour dimension of the volute 1 along the first straight line refers to the dimension of the line connecting the two intersection points of the first straight line and the circumferential side wall 14. It is understandable that one of the intersection points is the connection point between the volute tongue 11 and the circumferential side wall 14.

[0070] In this embodiment, the ratio of the outer contour 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 selecting a specific model of the wind wheel 2, the outer contour dimension of the volute 1 along the first straight line is set more reasonably. The fan assembly 10 can reduce the size of the circumferential side wall 14 of the volute 1 without reducing performance or increasing noise pollution, thereby reducing space occupancy and reducing manufacturing costs.

[0071] In some embodiments, the ratio of the outer contour dimension of the volute 1 along the second straight line to the diameter of the wind wheel 2 is 1.31-1.52, wherein the second straight line is a straight line passing through the center of the wind wheel 2 and perpendicular to the first straight line.

[0072] Exemplarily, the ratio of the outer contour 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.

[0073] For example, the diameter of the wind wheel 2 is 264 mm, the ratio of the outer contour dimension of the volute 1 along the second straight line to the diameter of the wind wheel 2 is 1.38, and the outer contour dimension of the volute 1 along the first straight line is 364.32 mm.

[0074] It should be noted that the outer contour dimension of the volute 1 along the second straight line refers to the dimension of the line connecting the two intersection points of the second straight line and the circumferential side wall 14 .

[0075] In this embodiment, the ratio of the outer contour 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 selecting a specific model of the wind wheel 2, the outer contour dimension of the volute 1 along the second straight line is set more reasonably. The fan assembly 10 can reduce the size of the circumferential side wall 14 of the volute 1 without reducing performance or increasing noise pollution, thereby reducing space occupancy and reducing manufacturing costs.

[0076] For example, please refer to Figure 5 The outer contour dimension of the volute 1 along the first straight line is D1, and the outer contour dimension of the volute 1 along the second straight line is D2.

[0077] The method of driving the wind wheel 2 to rotate is not limited.

[0078] Exemplarily, the fan assembly 10 includes a motor 3 .

[0079] That is to say, the motor 3 is fixedly mounted on the volute 1 and connected to the wind wheel 2 to drive the wind wheel 2 to rotate, thereby generating airflow, and then sucking air through the air inlet 12a.

[0080] The installation position of the motor 3 is not limited.

[0081] 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 .

[0082] In some other embodiments, please refer to Figures 1 to 4 The motor 3 is arranged 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 arranged away from the air inlet 12a, which reduces the air inlet resistance of the air inlet 12a, thereby reducing the wind resistance and noise caused by the motor 3 itself.

[0083] For example, please refer to Figure 1The fan assembly 10 includes a partition 4, which is arranged in the volute 1 and separates the wind wheel 2 and the motor 3. In this way, the motor 3 and the wind wheel 2 are isolated, the contact between the airflow and the motor 3 is reduced, and the service life of the motor 3 is extended.

[0084] An embodiment of the present application further provides a water heater, which includes a water tank, a heat pump system and a fan assembly 10 in any of the above embodiments.

[0085] The heat pump system includes an evaporator and a condenser, and the condenser is used to heat the water in the water tank.

[0086] The fan assembly 10 is disposed on one side of the evaporator to allow air to flow through the surface of the evaporator.

[0087] It can be understood that the evaporator stores refrigerant, which can absorb heat from the air to evaporate, and is transferred to the condenser through the heat pump system, and then the water in the water tank is heated by the condenser.

[0088] It can be understood that after the air flows through the surface of the evaporator, the refrigerant absorbs the heat in the air and the temperature of the air decreases. The fan assembly 10 can absorb the air with lowered temperature and generate airflow, so that the air whose heat has not been absorbed by the refrigerant can flow through the evaporator surface, thereby improving the heat absorption efficiency of the evaporator.

[0089] In some embodiments, the evaporator is disposed on one side of the air inlet 12 a of the volute 1 .

[0090] That is to say, by arranging the evaporator on one side of the air inlet 12a of the volute 1, the amount of air flowing through the evaporator is increased, and the air whose heat is absorbed by the refrigerant is difficult to stagnate on the surface of the evaporator, so that the air whose heat is not absorbed by the refrigerant can continue to flow through the surface of the evaporator, thereby improving the heat absorption efficiency.

[0091] Along the axial direction of the volute 1, the distance between the air inlet 12a and the evaporator is 40 mm to 120 mm.

[0092] Exemplarily, the distance between the air inlet 12a and the evaporator can be 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 82mm, 84mm, 86mm, 88mm, 90mm, 93mm, 96mm, 99mm, 100mm, 105mm, 110mm, 115mm or 120mm, etc.

[0093] In this embodiment, the distance between the air inlet 12a and the evaporator is set to 40 mm to 120 mm, so that the wind field formed between the air inlet 12a and the evaporator is more uniform, thereby improving the heat absorption efficiency of the evaporator.

[0094] In some embodiments, the heat pump system includes a compressor, and the evaporator, the compressor, and the fan assembly 10 are all disposed on the top side of the water tank, and the condenser surrounds the circumference of the water tank.

[0095] The specific structure of the condenser is not limited. For example, the condenser can be a copper tube or an aluminum microchannel.

[0096] Exemplarily, the working principle of the water heater is as follows: during the operation of the fan assembly 10, air flows through the surface of the evaporator, the air undergoes heat exchange through the evaporator, and the air with reduced temperature is discharged by the fan assembly 10. At the same time, the refrigerant inside the evaporator absorbs heat and vaporizes and is sucked into the compressor. The compressor compresses the vaporized refrigerant gas into a high-temperature, high-pressure gas and sends it into the condenser. The high-temperature, high-pressure gas can be converted from a gaseous state to a liquefied state. During the conversion process, a large amount of heat can be released, thereby heating the water in the water tank.

[0097] Exemplarily, the water heater includes a shell, which is arranged on the top side of the water tank, and the evaporator, compressor and fan assembly 10 are all arranged in the shell. The shell has an inlet and an outlet, and the air outlet 1a of the volute 1 is connected to the outlet.

[0098] Exemplarily, the working principle of the water heater is as follows: during the operation of the fan assembly 10, the gas in the shell is discharged from the shell through the air outlet 1a and the exhaust port, a negative pressure is formed in the shell, and the outside air enters the shell from the suction port. The air flows through the surface of the evaporator, and the air undergoes heat exchange through the evaporator. The air with lowered temperature is discharged from the shell through the exhaust port by the fan assembly 10. At the same time, the refrigerant inside the evaporator absorbs heat and vaporizes and is sucked into the compressor. The compressor compresses the vaporized refrigerant gas into a high-temperature, high-pressure gas and sends it into the condenser. The high-temperature, high-pressure gas can be converted from a gaseous state to a liquefied state. During the conversion process, a large amount of heat can be released, thereby heating the water in the water tank.

[0099] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present application, the schematic representation of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0100] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A fan assembly, characterized in that: include: A volute, comprising 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 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 to one end of the circumferential side wall; A wind wheel is arranged in the volute; A line from the center of the wind wheel to the connection between the volute tongue and the circumferential side wall is taken as a reference line, and an angle between a ray from the center of the wind wheel to the circumferential contour of the wind wheel and the reference line is taken as a reference angle. Within the range of the reference angle from 75° to 270°, the ratio of the length of the circumferential side wall to the center of the wind wheel to the radius of the wind wheel gradually increases, and the ratio does not exceed 1.

8.

2. The fan assembly according to claim 1, characterized in that: The difference between the maximum and minimum values ​​of the ratio does not exceed 0.

6.

3. The fan assembly according to claim 1, characterized in that: When the reference angle ranges from 75° to 270°, the ratio and the reference angle are in a nonlinear relationship.

4. The fan assembly according to claim 1, characterized in that: At a position where the reference angle is 75°, the ratio is 1.05 to 1.

3.

5. The fan assembly according to claim 1, characterized in that: At a position where the reference angle is 270°, the ratio is 1.5 to 1.

77.

6. The fan assembly according to claim 1, characterized in that: In the range of the reference angle from 0° to 75°, the ratio remains unchanged, or the difference between the ratios at any two locations does not exceed 0.

05.

7. The fan assembly according to claim 1, characterized in that: The ratio of the outer contour dimension of the volute along the 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 connection between the volute tongue and the circumferential side wall and the center of the wind wheel.

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

9. The fan assembly according to claim 1, characterized in that: The fan assembly includes a motor, which is arranged on the outer side of the second end wall. The power output shaft of the motor passes through the second end wall and is connected to the wind wheel.

10. A water heater, characterized in that: include: Water tank; A heat pump system, comprising an evaporator and a condenser, wherein the condenser is used to heat the water in the water tank; The fan assembly according to any one of claims 1 to 9, wherein the fan assembly is arranged on one side of the evaporator to allow air to flow through the surface of the evaporator.

11. The water heater according to claim 10, characterized in that The evaporator is arranged on one side of the air inlet of the volute, and along the axial direction of the volute, the distance between the air inlet and the evaporator is 40 mm to 120 mm.

12. The water heater according to claim 10, characterized in that The heat pump system comprises a compressor. The evaporator, the compressor and the fan assembly are all arranged on the top side of the water tank, and the condenser surrounds the circumference of the water tank.

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