Non-coplanar unequal-distance axial flow fan, heat dissipation assembly and water heater

Abstract

The invention discloses a non-coplanar unequal-distance axial flow fan, a heat dissipation assembly and a water heater, the non-coplanar unequal-distance axial flow fan is provided with an even number of fan blades and at least comprises two sets of fan blades, all the fan blades are arranged at intervals along the circumference of a fan impeller, and the fan blades in the same set are evenly distributed along the circumference of the impeller. The front edge roots of different groups of fan blades have axial distances, two included angles between any three continuously arranged fan blades are different, or the included angles between any adjacent fan blades between the closest two fan blades in the same group are different. By introducing the design that the fan blades are not coplanar and are not equidistant and the outer edges of the fan blades are connected, the airflow path is optimized, unnecessary energy loss is reduced, the air volume and efficiency are greatly improved under the same rotating speed, and the fan is particularly suitable for application scenes sensitive to noise and high in air volume requirement; the problems that an existing axial flow fan is large in rotation noise, limited in air volume and efficiency, poor in sound quality, remarkable in blade tip vortex effect and large in structural stress are effectively solved.

Description

Technical Field

[0001] The present invention belongs to the field of fans and water heaters, and in particular relates to a non-coplanar and unequally spaced axial flow fan, a heat dissipation component and a water heater. Background Art

[0002] Fans are common bladed fluid machines, widely used across various industries. They convert electrical energy into mechanical energy through a prime mover, driving the blades to rotate at high speeds to force air flow. However, the noise generated by fans during operation often causes problems for users, especially in environments where a quiet environment is required. Excessive noise levels not only affect comfort but can also negatively impact health and work efficiency. Therefore, reducing fan noise has become a key design consideration in many applications.

[0003] The design features of traditional axial fans include: (1) Equally spaced blade arrangement: All blades are evenly distributed on the rotor at the same intervals. This design is simple and easy to manufacture. (2) Coplanar arrangement: The leading edge roots and trailing edge roots of all blades are located in the same plane, making the structure symmetrical and easy to balance. However, traditional axial fans have some significant disadvantages. 1. All blades are located in the same plane, resulting in a single airflow path, which is prone to turbulence and airflow interference, affecting air volume and efficiency. 2. The traditional equal-spaced blade design causes the fan to generate periodic pressure waves when rotating. These pressure waves are superimposed at a specific frequency, especially at high speeds, forming a significant noise peak [BPF (i.e., blade passing frequency rotation noise) and its harmonics]. Users hear obvious rotation noise, which affects auditory comfort, especially in noise-sensitive application scenarios. 3. The periodic excitation effect and resonance phenomenon amplify the noise level, generating harsh sound components, affecting the user's auditory experience. The unpleasant auditory environment not only affects the user experience, but may also have a negative impact on work efficiency and health. 4. The equidistant blade design easily causes turbulence when the airflow passes through the blades, which increases the resistance to air flow and reduces the total air volume and efficiency. In addition, the airflow interference prevents each blade from fully utilizing its propulsion capacity, resulting in energy loss. 5. In traditional axial flow fans, the gap between the blade tip and the fan casing causes air to flow from the high-pressure side to the low-pressure side, forming tip vortices. These vortices consume additional energy, increase turbulence, resistance and noise. Problems such as high rotation noise, poor sound quality, limited air volume and efficiency, significant tip vortex effect and increased structural stress not only affect the user experience, but also limit its scope of application to a certain extent.

[0004] Chinese patent application number CN202010988931.2 discloses an automobile cooling fan blade, which adopts a structural design in which multiple blades are distributed at unequal intervals, but it still has shortcomings in performance.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a non-coplanar and unequally spaced axial flow fan that can reduce noise, increase air volume and efficiency, reduce energy loss and improve structural stability.

[0007] A second objective of the present invention is to provide a heat dissipation assembly.

[0008] A third object of the present invention is to provide a water heater.

[0009] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0010] A non-coplanar, unequally spaced axial flow fan has an even number of blades and at least two groups of blades. All blades are spaced apart along the circumference of the fan impeller. Blades in the same group are evenly distributed along the circumference of the impeller. The leading edge roots of blades in different groups have axial spacing. The two angles between any three consecutively arranged blades are different, or the angles between any adjacent blades between the two closest blades in the same group are different.

[0011] The fan has multiple groups of blades arranged along the circumference. Although the blades in each group are evenly distributed along the circumference, the blades of different groups are arranged in sequence at mixed intervals along the circumference. The two angles between any three consecutively arranged blades, that is, the three adjacent blades, are different. Alternatively, the angles between any adjacent blades between the two closest blades in the same group (including these two blades) are different, thus forming an unequally spaced blade arrangement. The fan of the present invention breaks the periodicity of the pressure waves generated by the rotation of the traditional fan with equal spacing blades by adopting an unequally spaced blade arrangement, so that the pressure fluctuations generated by each blade are dispersed to multiple frequencies instead of being concentrated at a specific frequency point, thereby reducing the noise intensity at a specific frequency and effectively reducing the overall noise level. Since the noise frequency is dispersed and the harsh sound components are reduced, a softer and more comfortable sound environment can be provided. By distributing different groups of fan blades on different planes, that is, the leading edge roots of different groups of fan blades have axial spacing, the airflow path is changed, so that the airflow passes through the fan more concentratedly and orderly, optimizing the aerodynamic performance, reducing turbulence, airflow interference, resonance effect and noise, making the airflow smoother, reducing flow resistance, thereby reducing unnecessary energy loss, improving the fan's total air volume output and efficiency, and effectively improving the sound quality.

[0012] Furthermore, the outer edges of two adjacent different groups of fan blades are connected to form a cylindrical surface and constitute a fan blade community, or the outer edges of all consecutive adjacent different groups of fan blades are connected to form a cylindrical surface and constitute the same number of fan blade communities as the number of fan blades in each group; the outer edges of adjacent fan blades in each fan blade community are not connected.

[0013] In order to further improve the performance of the fan, the outer edges of adjacent different groups of fan blades are connected according to the above scheme, which suppresses the lateral leakage of airflow, reduces the generation of tip vortexes, and reduces the uneven pressure distribution and vibration caused by tip vortexes, thereby reducing the energy loss of the fan and increasing the air volume output. At the same time, it significantly reduces the noise level, enhances the overall structural stability of the fan, and extends its service life.

[0014] Furthermore, with the apex of the leading edge of the blade at the top and the apex of the trailing edge at the bottom, the blades connected at the outer edges are connected backward starting from the lowest blade at the root of the leading edge.

[0015] Since there are multiple groups of fan blades, and different groups of fan blades are distributed on different planes, that is, the leading edge roots of different groups of fan blades have axial spacing. In order to make the fan have better performance, when different groups of fan blades are connected, they are connected backwards starting from the lowest fan blade at the leading edge root according to the direction theory that the leading edge apex of the fan blade is at the top and the trailing edge apex is at the bottom, and the outer edges of the fan blades of different groups are connected to form a fan blade community.

[0016] Furthermore, the central axis of the cylindrical surface formed by connecting the outer edges of the fan blades coincides with the central axis of rotation of the fan. The diameter of the cylindrical surface formed by connecting the outer edges of the fan blades is equal to the diameter of the fan blades.

[0017] To ensure that the blade connections do not interfere with fan operation, that the blade connections do not collide with the fan housing, and that the fan operates smoothly, the central axis of the cylindrical surface formed by the blade outer edges coincides with the fan's central axis of rotation. The diameter of the cylindrical surface formed by the blade outer edges is equal to the blade diameter.

[0018] Furthermore, the trailing edge roots of the blades of different groups have no axial spacing.

[0019] Furthermore, it includes two groups of fan blades, each group of fan blades has at least 2 blades and the number of fan blades in the two groups is equal.

[0020] Furthermore, the outer edges of the fan blades are connected to form a cylindrical surface, and the front and rear edges thereof are the edges of the fan blades between the leading edge vertex and the trailing edge vertex of each of the front and rear fan blades. Alternatively, the outer edges of the fan blades are connected to form a cylindrical surface, and the front and rear edges thereof extend beyond the blade edge between the leading edge vertex and the trailing edge vertex of each of the front and rear fan blades.

[0021] The two blade connection schemes proposed above, which connect the front and rear blades of a blade community, constitute the starting and ending blades of the blade community. In the first scheme, the cylindrical surface connecting the outer edges of the blades does not extend forward beyond the front blade, and the cylindrical surface connecting the outer edges of the blades does not extend backward beyond the rear blade; while in the second scheme, the cylindrical surface connecting the outer edges of the blades extends forward beyond the front blade, and the cylindrical surface connecting the outer edges of the blades extends backward beyond the rear blade.

[0022] The present invention further proposes a heat dissipation assembly, comprising the above-mentioned non-coplanar and unequally spaced axial flow fans, and also comprising a heat pipe, wherein the heat pipe comprises heat dissipation fins, and the heat dissipation fins are arranged in the air outlet direction of the fan.

[0023] The present invention also provides a water heater comprising the above-mentioned non-coplanar and unequally spaced axial flow fans.

[0024] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0025] The present invention provides a non-coplanar unequally spaced axial flow fan, a heat dissipation component and a water heater, wherein a non-coplanar unequally spaced axial flow fan has an even number of blades and at least two groups of blades, all blades are spaced along the circumference of the fan impeller, blades in the same group are evenly distributed along the circumference of the impeller, the leading edge roots of blades in different groups have an axial spacing, the two angles between any three consecutively arranged blades are different, or the angles between any adjacent blades between the two closest blades in the same group are different. By introducing the design of non-coplanar unequally spaced blades and blade outer edge connection, not only the airflow path is optimized and unnecessary energy loss is reduced, but also the air volume and efficiency are greatly improved at the same rotation speed. It is particularly suitable for application scenarios that are sensitive to noise and have high air volume requirements, and effectively solves the problems of large rotation noise, limited air volume and efficiency, poor sound quality, significant tip vortex effect and increased structural stress in existing axial flow fans.

[0026] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an undue limitation of the present invention. Obviously, the drawings described below are only some embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive effort. In the accompanying drawings:

[0028] Figure 1 It is a schematic diagram of a non-coplanar and unequally spaced axial flow fan of the present invention;

[0029] Figure 2This is a schematic diagram of the axial spacing between the leading edge roots of two groups of blades of a non-coplanar and unequally spaced axial flow fan of the present invention;

[0030] Figure 3 Schematic diagram of the angle between three adjacent blades in two groups of blades of a non-coplanar and unequally spaced axial flow fan according to the present invention;

[0031] Figure 4 The present invention is a schematic diagram of the outer edge connection between two groups of blades of a non-coplanar and unequally spaced axial flow fan.

[0032] In the figure: 1, first blade; 2, second blade; 3, third blade; 4, fourth blade; 5, fifth blade; 6, sixth blade; 7, cylindrical surface; a, apex of the leading edge of the first blade; b, apex of the leading edge of the second blade; c, apex of the trailing edge of the second blade; d, apex of the trailing edge of the first blade; L, axial distance between the root of the leading edge of the first blade and the root of the leading edge of the second blade.

[0033] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only used to facilitate the description of the present invention and simplify the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0036] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0037] A non-coplanar, unequally spaced axial flow fan comprises an even number of blades, including at least two groups of blades. The blades of each group are evenly distributed along the circumference, and the blades of different groups are arranged sequentially along the circumference at mixed intervals. The leading edge roots of the blades of different groups are axially spaced, that is, the leading edge roots of the blades of different groups are not in the same axial plane, forming a non-coplanar blade arrangement. The trailing edge roots of the blades of different groups do not have axial spacing, or the trailing edge roots of the blades of different groups may also have axial spacing.

[0038] The included angles between a certain fan blade and the adjacent fan blades before and after it are different, or the included angles between any adjacent fan blades between the two closest fan blades in the same group (here meaning including these two fan blades) are different, forming an unequally spaced fan blade arrangement.

[0039] Multiple groups of fan blades are arranged along the circumference. Although the blades in each group are evenly distributed along the circumference, the blades of different groups are arranged in sequence at mixed intervals along the circumference. The two angles between three adjacent blades are different, or the angles between any adjacent blades between the two closest blades in the same group (including these two blades) are different, thus forming an unequally spaced blade arrangement.

[0040] The fan blades of different groups are arranged in a mixed and spaced manner along the circumference, which means that all groups of fan blades are arranged along a set circumference coaxial with the rotating shaft. Mixed means that adjacent fan blades cannot be from the same group of fan blades, and all fan blades are arranged with circumferential spacing. The fan blades of the same group are evenly distributed along the set circumference.

[0041] For example, there are three groups of fan blades, A, B, and C, each group has two blades. The blades in group A are A1 and A2, the blades in group B are B1 and B2, and the blades in group C are C1 and C2.

[0042] The blades of different groups are arranged in sequence with mixed intervals along the circumference, and the arrangement order is A1, B1, C1, A2, B2, C2, and the above 6 blades are arranged with circumferential intervals between adjacent two blades.

[0043] The angles between any adjacent blades in the same group of the two closest blades (including these two blades) are different. Taking the above three groups of blades A, B, and C as an example, the angles between any adjacent blades in group A of the two closest blades A1 and A2 (including these two blades) are different, that is, the angles between A1 and B1, B1 and C1, and C1 and A2 are all different. The angle between adjacent blades refers to the angle between the line connecting the leading edge vertices of the two adjacent blades and the center of the rotating shaft. The leading edge vertex of the blade refers to the intersection of the leading edge and the outer edge of the blade.

[0044] The fan of the present invention breaks the periodicity of the pressure waves generated by the rotation of a traditional fan with equally spaced blades by adopting an unequally spaced blade arrangement, so that the pressure fluctuations generated by each blade are dispersed to multiple frequencies instead of being concentrated at a specific frequency point, thereby reducing the noise intensity at a specific frequency and effectively reducing the overall noise level. Since the noise frequency is dispersed and the harsh sound components are reduced, a softer and more comfortable sound environment can be provided. By distributing different groups of blades on different planes, that is, the leading edge roots of different groups of blades have axial spacing, the airflow path is changed, so that the airflow passes through the fan in a more concentrated and orderly manner, optimizing the aerodynamic performance, reducing turbulence and airflow interference and resonance effects, making the airflow smoother, reducing flow resistance, thereby reducing unnecessary energy loss, improving the total air volume output and efficiency of the fan, and effectively improving the sound quality.

[0045] The outer edges of two adjacent different groups of fan blades are connected to form a cylindrical surface and constitute a fan blade community, or the outer edges of all consecutive adjacent different groups of fan blades are connected to form a cylindrical surface and constitute the same number of fan blade communities as the number of fan blades in each group; the outer edges of adjacent fan blades between each fan blade community are not connected. There are two schemes here. The first scheme is to connect two adjacent fan blades to form a fan blade community, and then connect the two adjacent fan blades behind it to form a fan blade community, and the fan blade communities are not connected. Since the fan blades of different groups are mixed and arranged in sequence at intervals, the two adjacent fan blades must belong to different groups. The second scheme is to connect the outer edges of all consecutive adjacent different groups of fan blades, that is, all the fan blades connected together to form a fan blade community include all groups and there are no two fan blades in the same group, and the outer edges of adjacent fan blades between each fan blade community are not connected.

[0046] The outer edges of all consecutively adjacent different groups of blades are connected to form a cylindrical surface and constitute the same number of blade communities as the number of blades in each group. The outer edges of adjacent blades between each blade community are not connected. Taking the above-mentioned three groups of blades A, B, and C as an example, the outer edges of the three blades A1, B1, and C1 of the three consecutively adjacent groups are connected to form a blade community, and the outer edges of the three blades A2, B2, and C2 are connected to form a blade community, forming a total of two blade communities. The adjacent blades between the two blade communities are C1 and A2, and C2 and A1, but blades C1 and A2 are not connected, and blades C2 and A1 are not connected.

[0047] By connecting the outer edges of adjacent groups of fan blades according to the above scheme, the lateral leakage of airflow is suppressed, the generation of blade tip vortexes is reduced, and the uneven pressure distribution and vibration caused by blade tip vortexes are reduced, thereby reducing the energy loss of the fan and increasing the air volume output. At the same time, the noise level is significantly reduced, the overall structural stability of the fan is enhanced, and the service life is extended.

[0048] Since there are multiple groups of fan blades, and different groups of fan blades are distributed on different planes, that is, the leading edge roots of different groups of fan blades have axial spacing. In order to make the fan have better performance, when different groups of fan blades are connected, they are connected backwards starting from the lowest fan blade at the leading edge root according to the direction theory that the leading edge apex of the fan blade is at the top and the trailing edge apex is at the bottom, and the outer edges of the fan blades of different groups are connected to form a fan blade community.

[0049] Taking the above-mentioned three groups of fan blades A, B, and C as an example, the leading edge root of the fan blades in group A is the lowest, so starting from A1, connecting backwards, connecting the blades A1, B1, and C1 of different groups together to form a fan blade community, starting from A2, connecting backwards, connecting the blades A2, B2, and C2 of different groups together to form a fan blade community.

[0050] To ensure that the blade connections do not interfere with fan operation, that the blade connections do not collide with the fan housing, and that the fan operates smoothly, the central axis of the cylindrical surface formed by the blade outer edges coincides with the fan's central axis of rotation. The diameter of the cylindrical surface formed by the blade outer edges is equal to the blade diameter.

[0051] The outer edges of the fan blades are connected to form a cylindrical surface, and its front and rear edges are the blade edges between the leading edge vertex and the trailing edge vertex of the front and rear blades respectively. Alternatively, the outer edges of the fan blades are connected to form a cylindrical surface, and its front and rear edges exceed the blade edges between the leading edge vertex and the trailing edge vertex of the front and rear blades respectively. The above two schemes for connecting fan blades are proposed, and the front and rear two fan blades connected together to form a fan blade community constitute the starting and ending blades of the fan blade community. In the first scheme, the cylindrical surface connecting the outer edges of the fan blades does not extend forward beyond the front fan blade, and the cylindrical surface connecting the outer edges of the fan blades does not extend backward beyond the last fan blade; and in the second scheme, the cylindrical surface connecting the outer edges of the fan blades extends forward beyond the front fan blade, and the cylindrical surface connecting the outer edges of the fan blades extends backward beyond the last fan blade.

[0052] For more illustrative purposes, the number of fan blade groups and the number of fan blades in each group used in the following embodiments are different from the above three groups of fan blades A, B, and C. Figure 1-4 As shown, the non-coplanar and unequally spaced axial flow fan described in this embodiment has two groups of blades, each group is provided with 3 blades, and there are 6 blades from the first blade to the sixth blade. The first blade 1, the second blade 2, the third blade 3, the fourth blade 4, the fifth blade 5, and the sixth blade 6 are arranged in sequence, wherein the first blade 1, the third blade 3, and the fifth blade 5 belong to the first group, and the second blade 2, the fourth blade 4, and the sixth blade 6 belong to the second group. The blades of the first group are evenly distributed along the circumference, and the blades of the second group are evenly distributed along the circumference. The blades of the same group are arranged in the same plane. The leading edge roots of the blades of the same group do not have axial spacing, and the trailing edge roots do not have axial spacing. As shown Figure 2As shown, according to the direction theory that the leading edge apex of the fan blades is at the top and the trailing edge apex is at the bottom, the leading edge root of the first group of blades is lower than the leading edge root of the second group of blades, and the leading edge roots of the two groups of blades are not in the same plane, that is, the two groups of blades are not arranged coplanarly, and the axial distance between the leading edge root of the first blade and the leading edge root of the second blade is L.

[0053] like Figure 3 As shown, the angle between the first blade 1 and the second blade 2 is α, and the angle between the second blade 2 and the third blade 3 is β, α≠β, that is, the two angles between the three adjacent blades are not equal, thus forming an unequally spaced blade arrangement.

[0054] like Figure 4 As shown, according to the principle that the leading edge vertex of the fan blade is at the top and the trailing edge vertex is at the bottom, the leading edge root of the first blade 1 is lower than the leading edge root of the second blade. Therefore, starting from the first blade 1 and connecting to the second blade 2, the outer edges of the first blade 1 and the second blade 2 are connected to form a blade community, the outer edges of the third blade 3 and the fourth blade 4 are connected to form a blade community, and the outer edges of the fifth blade 5 and the sixth blade 6 are connected to form a blade community. The outer edges of the blades of the respective blade communities are not connected. The fan rotates counterclockwise in the direction of the arrow in the figure.

[0055] like Figure 4 As shown, the first blade leading edge vertex a, the second blade leading edge vertex b, the second blade trailing edge vertex c, the first blade trailing edge vertex d, the connection points ab, bc, cd, da, that is, the outer edge of the first blade 1 and the outer edge of the second blade 2 are connected to form a cylindrical surface 7, the center axis of the cylindrical surface 7 coincides with the central axis of rotation of the fan, the diameter of the cylindrical surface 7 is equal to the blade diameter, that is, the front view projection coincides with the outermost edge of the fan blade. In addition, the cylindrical surface 7 does not extend forward beyond the first blade 1, and the cylindrical surface 7 does not extend backward beyond the second blade 2. The cylindrical surface connecting the third blade 3 and the fourth blade 4, and the circumferential surface connecting the fifth blade 5 and the sixth blade 6 are similarly set.

[0056] The outer edges of the second fan blade 2 and the third fan blade 3 are not connected, the outer edges of the fourth fan blade 4 and the fifth fan blade 5 are not connected, and the outer edge of the sixth fan blade 6 and the first fan blade 1 are not connected.

[0057] The present invention also provides a heat dissipation assembly comprising the aforementioned non-coplanar, unequally spaced axial flow fans and a heat pipe, wherein the heat pipe comprises heat dissipation fins disposed in the air outlet direction of the fan. This assembly can improve heat dissipation efficiency and reduce noise.

[0058] The present invention also provides a water heater including the aforementioned non-coplanar, unequally spaced axial flow fan. Using this fan in a gas water heater significantly increases air volume and heat dissipation efficiency at the same rotational speed, thereby enhancing user experience and extending the life of the water heater.

[0059] The present invention provides a non-coplanar, unequally spaced axial flow fan, a heat dissipation component, and a water heater, wherein a non-coplanar, unequally spaced axial flow fan comprises at least two groups of blades, each group of blades comprises an even number of blades uniformly distributed along the circumference, different groups of blades are arranged in sequence with mixed intervals, the leading edge roots of different groups of blades have axial spacing, the angles between a certain blade and the adjacent blades in front and behind are different, or the angles between any adjacent blades between the two closest blades in the same group are different. By introducing the design of non-coplanar, unequally spaced blades and blade outer edge connection, not only the airflow path is optimized and unnecessary energy loss is reduced, but also the air volume and efficiency are greatly improved at the same rotation speed. It is particularly suitable for application scenarios that are sensitive to noise and have high air volume requirements, and effectively solves the problems of existing axial flow fans such as high rotation noise, limited air volume and efficiency, poor sound quality, significant tip vortex effect, and increased structural stress.

[0060] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this patent can make slight changes or modifications to equivalent embodiments of equivalent changes using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. The implementation schemes in the above-mentioned embodiments can also be further combined or replaced. However, any simple modifications, equivalent changes and modifications made to the above-mentioned embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A non-coplanar and unequally spaced axial flow fan, characterized in that: There are an even number of blades, and at least two groups of blades. All blades are spaced apart along the circumference of the fan impeller, and the blades in the same group are evenly distributed along the circumference of the impeller. The leading edge roots of different groups of blades have axial spacing. The two included angles between any three consecutively arranged blades are different, or the included angles between any adjacent blades between the two nearest blades in the same group are different.

2. The non-coplanar and unequally spaced axial flow fan according to claim 1, characterized in that: The outer edges of two adjacent different groups of fan blades are connected to form a cylindrical surface and constitute a fan blade community, or the outer edges of all consecutive adjacent different groups of fan blades are connected to form a cylindrical surface and constitute a fan blade community with the same number as the number of fan blades in each group; the outer edges of adjacent fan blades in each fan blade community are not connected.

3. The non-coplanar and unequally spaced axial flow fan according to claim 2, characterized in that: With the leading edge vertex of the fan blade at the top and the trailing edge vertex at the bottom, the fan blades connected at the outer edges are connected backward starting from the fan blade with the lowest root of the leading edge.

4. The non-coplanar and unequally spaced axial flow fan according to claim 3, characterized in that: The outer edges of the fan blades are connected to form a cylindrical surface whose central axis coincides with the rotation center axis of the fan.

5. The non-coplanar and unequally spaced axial flow fan according to claim 4, characterized in that: The outer edges of the fan blades are connected to form a cylindrical surface whose diameter is equal to the diameter of the fan blades.

6. The non-coplanar and unequally spaced axial flow fan according to claim 5, characterized in that: The trailing edge roots of the blades of different groups have no axial spacing.

7. The non-coplanar and unequally spaced axial flow fan according to any one of claims 1 to 6, characterized in that: It includes two groups of fan blades, each group of fan blades has at least 2 blades and the number of fan blades in the two groups is equal.

8. The non-coplanar and unequally spaced axial flow fan according to claim 7, characterized in that: The outer edges of the fan blades are connected to form a cylindrical surface, and its front and rear edges are the fan blade edges between the leading edge vertices and the trailing edge vertices of the front and rear fan blades respectively; or, the outer edges of the fan blades are connected to form a cylindrical surface, and its front and rear edges extend beyond the fan blade edges between the leading edge vertices and the trailing edge vertices of the front and rear fan blades respectively.

9. A heat dissipation component, characterized in that: It comprises the non-coplanar and unequally spaced axial flow fan according to any one of claims 1 to 8, and further comprises a heat pipe, the heat pipe comprises heat dissipation fins, and the heat dissipation fins are arranged in the air outlet direction of the fan.

10. A water heater, characterized in that: The invention comprises the non-coplanar and unequally spaced axial flow fan according to any one of claims 1 to 8.

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