Centrifugal fan wheel and fan

Abstract

The application provides a centrifugal fan wheel and a fan. The centrifugal fan wheel comprises a body with a fan wheel center and a plurality of fan blades arranged around the fan wheel center. The body comprises a mounting area around the fan wheel center, and the fan blades are mounted on the mounting area. The mounting area comprises an inner ring around the fan wheel center and an outer ring around the inner ring radially outside the inner ring. Each fan blade comprises a windward plate rotationally connected to the inner ring and a blower plate rotationally connected to the outer ring. In any one fan blade, the windward plate and the blower plate are rotationally connected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical appliances, in particular to a centrifugal fan wheel and a fan. BACKGROUND

[0002] The centrifugal fan wheel is a kind of blowing device capable of realizing axial air inlet and circumferential air outlet during rotation. The existing centrifugal fan wheel is divided into unidirectional fan wheel and bidirectional fan wheel. The unidirectional fan wheel can only rotate and run in one rotation direction, and the fan blade parameters thereof include an inlet angle α in the range of 40°-60° and an outlet angle β in the range of 110°-170°. As for the bidirectional fan wheel, in order to balance the blowing performance in different rotation directions, the inlet angle and the outlet angle of the fan blade are both close to 90°. However, the blowing performance of the bidirectional fan wheel is inferior to that of the unidirectional fan wheel of the same size specification, regardless of forward rotation or reverse rotation.

[0003] With the continuous enrichment and expansion of the application scenarios of the centrifugal fan wheel, in many occasions, the centrifugal fan wheel needs to have forward and reverse rotation working states, and the rotation direction of the centrifugal fan wheel needs to be changed at any time to meet different use requirements, so as to ensure that the centrifugal fan wheel has an inlet angle and an outlet angle within the recommended range of the industry in any working state, so that the blowing performance of the bidirectional fan wheel is comparable to that of the unidirectional fan wheel. SUMMARY

[0004] In view of this, the present application provides a centrifugal fan wheel capable of forward rotation and reverse rotation, and having equivalent and good blowing effect in the two working states.

[0005] The centrifugal fan wheel provided by the present application comprises a body having a fan wheel center and a plurality of fan blades arranged around the fan wheel center. The body comprises a mounting area around the fan wheel center, and the fan blades are mounted in the mounting area. The mounting area comprises an inner ring around the fan wheel center, and further comprises an outer ring around the inner ring radially outside the inner ring. Each fan blade comprises a windward plate rotationally connected to the inner ring, and further comprises a blower plate rotationally connected to the outer ring. In any one fan blade, the windward plate and the blower plate are rotationally connected.

[0006] The fan blade of the centrifugal fan wheel of the present application can change its shape. Through inertial action, the shape of the fan blade can change along with the rotation direction of the body, so that the fan blade obtains a wind guide shape corresponding to two rotation directions of the body respectively. Whether the centrifugal fan wheel runs forward or reversely, the inlet angle and the outlet angle of the fan blade can automatically match the current rotation direction of the body, and the inlet angle and the outlet angle can both obtain an angle value within the recommended range of the industry. Therefore, the centrifugal fan wheel has good and consistent blowing effect in the two working states. When the body realizes stable rotation in a certain rotation direction, the fan blade can maintain its shape unchanged under the action of centrifugal force, and the angle values of the inlet angle and the outlet angle are maintained stable, so as to stably guide the flow of gas. Therefore, the blowing effect of the centrifugal fan wheel of the present application is comparable to that of the traditional centrifugal fan wheel.

[0007] In one embodiment, the inner ring is provided with a plurality of special-shaped holes arranged around the center of the wind wheel, the outer ring is provided with a plurality of hinged holes arranged around the center of the wind wheel, the wind-facing plate comprises inner connecting portions arranged in the special-shaped holes, and the inner connecting portions are capable of moving close to and away from the center of the wind wheel.

[0008] In this way, the special-shaped holes provide a space allowance for normal deformation of the fan blades, as the speed of the body increases, the air supply plate swings around the axis of the hinged hole, and the wind-facing plate swings and moves away from the center of the wind wheel under the action of inertia and the pulling force of the air supply plate, thereby changing the inlet angle and outlet angle of the fan blades and switching the shape of the fan blades to a wind guide shape that adapts to the current rotation direction of the body.

[0009] In one embodiment, the inner ring is provided with a plurality of hinged holes arranged around the center of the wind wheel, the outer ring is provided with a plurality of special-shaped holes arranged around the center of the wind wheel, the wind-facing plate comprises inner connecting portions arranged in the hinged holes, and the air supply plate comprises outer connecting portions arranged in the special-shaped holes, and the outer connecting portions are capable of moving close to and away from the center of the wind wheel.

[0010] In this way, the special-shaped holes provide a space allowance for normal deformation of the fan blades, as the speed of the body increases, the wind-facing plate swings around the axis of the hinged hole, and the air supply plate swings and moves close to the center of the wind wheel under the action of inertia and the pulling force of the wind-facing plate, thereby changing the inlet angle and outlet angle of the fan blades and switching the shape of the fan blades to a wind guide shape that adapts to the current rotation direction of the body.

[0011] In one embodiment, the rotation center of the wind-facing plate and the air supply plate forms a bending center of the fan blades, the distance from the outer connecting portion to the bending center is L1, the distance from the inner connecting portion to the bending center is L2, and 1.3≤L1 / L2≤2; and / or, when the body rotates around the center of the wind wheel, an included angle α' is formed between the circumferential velocity direction of the wind-facing plate and the inner connecting portion, the supplementary angle of α' is α, and 40°≤α≤60°; an included angle β is formed between the circumferential velocity direction of the air supply plate and the outer connecting portion, and 110°≤β≤170°.

[0012] In this way, the wind guide shape formed by the fan blades under the action of inertia tends to be similar to the shape of a conventional fixed fan blade, the inlet angle of the fan blades ranges from 40° to 60°, and the outlet angle ranges from 110° to 170°, so that a wind guide effect similar to that of a conventional fixed fan blade can be obtained.

[0013] In one embodiment, the inner ring and the outer ring further have a plurality of accommodating holes arranged around the center of the wind wheel, and the wind-facing plate and / or the air supply plate further comprises a sliding connecting portion that extends into the accommodating hole and is slidingly connected to the body.

[0014] In this way, the sliding portion can slide relative to the body to quickly and regularly drive the windward plate and the air supply plate to swing relative to the body, thereby accelerating the switching of the fan blade to the deflector shape. In addition, the accommodating hole limits the movement stroke of the sliding portion, thereby limiting the deflector shape of the fan blade.

[0015] In one of the embodiments, one of the windward plate and the air supply plate is configured to swing relative to the body around a given swing center, and the other is configured to approach and move away from the center of the wind wheel within a preset range. The accommodating hole is an arc-shaped hole, and the center of the arc-shaped hole is located at the swing center.

[0016] In this way, the accommodating hole can regulate the swing posture of the windward plate and the air supply plate, so that one of the windward plate and the air supply plate strictly swings around the swing center, and ensures that the rotation and movement of the other relative to the body can be smoothly and low-resistance.

[0017] In one of the embodiments, the outer ring is provided with a plurality of hinge holes arranged around the center of the wind wheel for the air supply plate to be hinged to the body. The axis of the hinge hole forms the swing center, and the shortest distance line from the hinge hole to the center of the wind wheel is the perpendicular bisector of the connecting line of the two ends of the arc-shaped hole.

[0018] In this way, under the conditions of forward rotation and reverse rotation of the body, the two deflector shapes assumed by the fan blade are symmetrical about the shortest distance line from the hinge hole to the center of the wind wheel, so that the blowing performance of the centrifugal wind wheel under the conditions of forward rotation and reverse rotation of the body can be ensured to be consistent.

[0019] In one of the embodiments, the rotation center of the windward plate and the air supply plate forms a bending center of the fan blade, and the bending center coincides with the axis of the sliding portion.

[0020] In this way, during the process of changing the shape of the fan blade following the rotation of the body, the part of the fan blade subjected to the inertial force is located at the bending center, that is, the inertial force acting on the sliding portion at this time is greater than the inertial force acting on other parts of the fan blade, thereby significantly improving the rate of changing the shape of the fan blade.

[0021] In one of the embodiments, the thickness of the windward plate increases from the end of the windward plate away from the air supply plate to the end of the windward plate connected to the air supply plate; and / or, the thickness of the air supply plate increases from the end of the air supply plate away from the windward plate to the end of the air supply plate connected to the windward plate.

[0022] In this way, the moment of inertia of the air supply plate relative to the rotation of the body increases, and the moment of inertia of the windward plate relative to the rotation of the body increases. The weight distribution of the fan blade makes the fan blade more easily change the shape under the action of inertia. During the process of changing the shape of the fan blade following the rotation of the body, the connection area of the windward plate and the air supply plate will more easily lag behind the end of the air supply plate away from the windward plate and the end of the windward plate away from the air supply plate.

[0023] In one of the embodiments, the curved surface of the windward plate and the air delivery plate are adapted and sealed.

[0024] In this way, no gap or air channel is formed between the windward plate and the air delivery plate, so that the air flow through the fan blade and the air flow between the windward plate and the air delivery plate are avoided, and the air can be smoothly discharged from the body along the surface of the windward plate and the air delivery plate, thereby improving the blowing performance of the centrifugal fan.

[0025] In one of the embodiments, one of the windward plate and the air delivery plate comprises a rotating shaft, and the other one comprises a rotating groove, the inner wall of the rotating groove is a cylindrical surface, the rotating shaft is coaxially arranged in the rotating groove, and the rotating shaft and the rotating groove are in rotating sealing cooperation.

[0026] In this way, the rotating connection between the windward plate and the air delivery plate and the sealing cooperation between the windward plate and the air delivery plate are mutually adapted, and the shape change of the fan blade and the air guiding effect of the fan blade are considered.

[0027] In one of the embodiments, one of the windward plate and the air delivery plate comprises an anti-disengagement part with a C-shaped groove, and the other one comprises a rotating shaft in rotating cooperation with the inner wall of the C-shaped groove, the opening width of the C-shaped groove is smaller than the outer diameter of the rotating shaft.

[0028] In this way, the rotating shaft can always be connected to the anti-disengagement part, and the windward plate and the air delivery plate are not easily disengaged under the constraint of the anti-disengagement part, thereby improving the reliability of the centrifugal fan.

[0029] In one of the embodiments, one of the windward plate and the air delivery plate comprising the rotating shaft is provided with an avoiding groove, the size of the avoiding groove in the axial direction of the rotating shaft corresponds to the length interval of the anti-disengagement part adapted to the outer cylindrical surface of the rotating shaft, and the anti-disengagement part is configured to be able to rotate into the avoiding groove along the outer cylindrical surface of the rotating shaft.

[0030] In this way, the anti-disengagement part does not interfere with the air delivery plate during the rotation of the windward plate relative to the air delivery plate, so that the included angle between the windward plate and the air delivery plate can be changed in a larger range, and thus the shape change of the fan blade is more significant, and the air guiding shape required for guiding the air flow can be better met.

[0031] The application also provides a fan comprising the centrifugal fan. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is an explosion schematic diagram of the centrifugal fan of one embodiment of the application;

[0033] Figure 2 It is a partial schematic diagram of the centrifugal fan of one embodiment of the application;

[0034] Figure 3 It is an assembly schematic diagram of the fan blade of one embodiment of the application;

[0035] Figure 4 An exploded view of a fan blade according to an embodiment of the present application;

[0036] Figure 5 A partial structural view of a centrifugal fan wheel in a first state according to an embodiment of the present application;

[0037] Figure 6 A partial structural view of a centrifugal fan wheel in a second state according to an embodiment of the present application; Figure 5 A first partial enlarged view of the centrifugal fan wheel shown in A according to an embodiment of the present application;

[0038] Figure 7 A partial structural view of a centrifugal fan wheel in a third state according to an embodiment of the present application;

[0039] Figure 8 A second partial enlarged view of the centrifugal fan wheel shown in B according to an embodiment of the present application; Figure 7 A third partial enlarged view of the centrifugal fan wheel shown in B according to an embodiment of the present application;

[0040] Figure 9 A fourth partial enlarged view of the centrifugal fan wheel shown in B according to an embodiment of the present application; Figure 7 A fourth partial enlarged view of the centrifugal fan wheel shown in B according to an embodiment of the present application;

[0041] Figure 10 A fourth partial enlarged view of the centrifugal fan wheel shown in B according to an embodiment of the present application; Figure 7 A fourth partial enlarged view of the centrifugal fan wheel shown in B according to an embodiment of the present application;

[0042] Figure 11 A partial structural view of a centrifugal fan wheel in a third state according to an embodiment of the present application;

[0043] Figure 12 A partial structural view of a centrifugal fan wheel in a third state according to an embodiment of the present application; Figure 11 A partial structural view of a centrifugal fan wheel in a third state according to an embodiment of the present application.

[0044] BRIEF DESCRIPTION OF THE DRAWINGS

[0045] 100, centrifugal fan wheel; 10, fan blade; 11, windward plate; 111, inner connecting portion; 112, rotating groove; 113, anti-disengagement portion; 114, C-shaped groove; 12, air delivery plate; 121, outer connecting portion; 1221, sliding portion; 1222, rotating shaft; 123, avoiding groove; 20, body; 201, front disc; 202, rear disc; 21, mounting area; 211, inner ring; 212, outer ring; 22, accommodating hole; 221, arc-shaped hole; 222, stop end; 23, special-shaped hole; 24, hinged hole; 30, fan wheel center. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of the present application.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing the specific embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0048] The present application provides a centrifugal fan wheel 100, which can be used in household appliances, industrial manufacturing, raw material production and the like. The centrifugal fan wheel 100 is one of the core devices of a centrifugal fan, and the wind speed and the air output of the centrifugal fan wheel 100 are key indicators for measuring the performance of the centrifugal fan wheel 100. Referring to Figure 1 The centrifugal fan wheel 100 of the present application comprises a body 20 and a plurality of fan blades 10. The body 20 comprises a front disc 201 and a rear disc 202 coaxially installed. An axial gap is provided between the front disc 201 and the rear disc 202, and the fan blades 10 are arranged in the axial gap.

[0049] The front disc 201 and the rear disc 202 are both disc cover structures. After the front disc 201 and the rear disc 202 are coaxially fixed and installed, the common axis of the two forms a fan wheel center 30 of the centrifugal fan wheel 100. The body 20 can rotate around the fan wheel center 30 under the driving of an external driving structure. The plurality of fan blades 10 are arranged in a circumferential direction around the fan wheel center 30 in the axial gap between the front disc 201 and the rear disc 202, so as to form an exhaust passage between any two adjacent fan blades 10. The exhaust passage is arranged in a circumferential direction around the fan wheel center 30.

[0050] The body 20 further comprises an air inlet passage extending along the fan wheel center 30. The air inlet passage is in communication with all the exhaust passages, so that the gas enters the body 20 in an axial direction of the centrifugal fan wheel 100, and then is discharged from the outer periphery of the body 20 through the plurality of exhaust passages. The front disc 201 is provided with a weight-reducing hole penetrating through the axial ends thereof. The rear disc 202 is also provided with a weight-reducing hole penetrating through the axial ends thereof. The weight-reducing holes of the front disc 201 and / or the rear disc 202 are in communication through the axial gap between the front disc 201 and the rear disc 202, so as to form the air inlet passage.

[0051] The body 20 comprises a mounting area 21 in the shape of a ring and circumferentially surrounding the wind wheel center 30, and all the fan blades 10 are mounted on the mounting area 21. The mounting area 21 can be formed on one end of the front disc 201 facing the rear disc 202, or on one end of the rear disc 202 facing the front disc 201, or jointly formed by one end of the front disc 201 facing the rear disc 202 and one end of the rear disc 202 facing the front disc 201. The fan blades 10 can be mounted on one end of the front disc 201 facing the rear disc 202, or on one end of the rear disc 202 facing the front disc 201, or connected to both the front disc 201 and the rear disc 202.

[0052] Optionally, all the fan blades 10 are arranged around the wind wheel center 30, and all the exhaust channels are arranged around the wind wheel center 30, so as to ensure that the centrifugal wind wheel 100 has uniform air outlet effect in the peripheral direction of the body 20, and the air speed and air volume of each exhaust channel are the same.

[0053] Optionally, the body 20 comprises a power transmission part for connecting to an external driving structure, and the axis of the power transmission part is the wind wheel center 30, and the power transmission part can be formed in at least one of the front disc 201 or the rear disc 202.

[0054] The existing centrifugal wind wheel is divided into a unidirectional wind wheel and a bidirectional wind wheel. The unidirectional wind wheel has only one working state, i.e., intelligently rotating in one rotation direction. In the unidirectional wind wheel, the shape of the fan blade is generally set as follows: the fan blade parameters include an inlet angle with a value range of 40°-60° and an outlet angle with a value range of 110°-170°, and the inlet angle and the outlet angle of the unidirectional wind wheel are within the recommended value range in the industry. The bidirectional wind wheel can rotate forward and backward, and has two working states. In order to balance the air blowing performance in different rotation directions, the shape of the fan blade in the bidirectional wind wheel is set as follows: the inlet angle and the outlet angle are both valued near 90°. As a result, the air blowing performance of the bidirectional wind wheel is inferior to that of the unidirectional wind wheel of the same size specification, whether rotating forward or backward.

[0055] With the increasing richness and expansion of the application scenarios of the centrifugal wind wheel, many occasions require the centrifugal wind wheel to have two working states of forward rotation and reverse rotation, to be able to change the rotation direction of the centrifugal wind wheel at any time according to different use requirements, and to ensure that the centrifugal wind wheel has an inlet angle and an outlet angle within the recommended range in the industry in any working state, so as to make the air blowing performance of the bidirectional wind wheel consistent with that of the unidirectional wind wheel.

[0056] In view of this, the centrifugal wind wheel 100 of the present application is improved as follows, so that the centrifugal wind wheel 100 of the present application has two rotation directions that can be converted to each other, thereby having a forward rotation working state and a reverse rotation working state. Figures 2-3In the present application, the fan blade 10 is a movable structure, which can not only move relative to the body 20, but also change its shape through movement. The fan blade 10 changes the air guide mode through deformation and movement relative to the body 20, and the shape and extension direction of the exhaust passage are changed synchronously with the change of the air guide mode of the fan blade 10.

[0057] Specifically, the fan blade 10 includes a windward plate 11 and a blowing plate 12 rotatably connected, the distance from the windward plate 11 to the wind wheel center 30 is less than the distance from the blowing plate 12 to the wind wheel center 30; the mounting area 21 includes an inner ring 211 in the form of a ring and an outer ring 212 in the form of a ring, the inner ring 211 surrounds the wind wheel center 30 along the circumferential direction of the wind wheel center 30, and the outer ring 212 surrounds the inner ring 211 and the wind wheel center 30 along the circumferential direction of the wind wheel center 30 radially outside the inner ring 211; the mounting area 21 is also provided with a plurality of accommodating holes 22, the plurality of accommodating holes 22 surround the wind wheel center 30 along the circumferential direction of the wind wheel center 30, the number of the fan blade 10 and the accommodating hole 22 is corresponding and one-to-one.

[0058] The mounting area 21 of the front disc 201 towards one end of the rear disc 202 includes the inner ring 211 of the front disc 201 and the outer ring 212 of the front disc 201, and the mounting area 21 of the rear disc 202 towards one end of the front disc 201 includes the inner ring 211 of the rear disc 202 and the outer ring 212 of the rear disc 202. The windward plate 11 can be rotatably connected to the inner ring 211 of the front disc 201, rotatably connected to the inner ring 211 of the rear disc 202, or rotatably connected to the inner ring 211 of the front disc 201 and the inner ring 211 of the rear disc 202, and the blowing plate 12 can be rotatably connected to the outer ring 212 of the front disc 201, rotatably connected to the outer ring 212 of the rear disc 202, or rotatably connected to the outer ring 212 of the front disc 201 and the outer ring 212 of the rear disc 202.

[0059] Further, the mounting area 21 of the front disc 201 can be provided with the accommodating hole 22, the mounting area 21 of the rear disc 202 can be provided with the accommodating hole 22, or the mounting area 21 of the front disc 201 and the mounting area 21 of the rear disc 202 can be provided with the accommodating hole 22.

[0060] The radial direction of the wind wheel center 30 is the radial direction of the inner ring 211, the radial direction of the outer ring 212, and even the radial direction of the body 20. The outer ring 212 is arranged around the inner ring 211 radially outside the inner ring 211, which includes the outer ring 212 of the front disc 201 around the inner ring 211 of the front disc 201, the outer ring 212 of the rear disc 202 around the inner ring 211 of the rear disc 202, the outer ring 212 of the rear disc 202 around the inner ring 211 of the front disc 201, and the outer ring 212 of the front disc 201 around the inner ring 211 of the rear disc 202.

[0061] For convenience of description, the mounting areas 21 of the front disc 201 and the rear disc 202 are collectively referred to as the mounting areas 21 of the body 20, the inner rings 211 of the front disc 201 and the rear disc 202 are collectively referred to as the inner rings 211 of the body 20, the outer rings 212 of the front disc 201 and the rear disc 202 are collectively referred to as the outer rings 212 of the body 20, and the receiving holes 22 of the front disc 201 and the rear disc 202 are collectively referred to as the receiving holes 22 of the body 20. A structure connected to the inner ring 211 of the body 20 means that the structure is connected to at least one of the inner ring 211 of the front disc 201 and the inner ring 211 of the rear disc 202; a structure connected to the outer ring 212 of the body 20 means that the structure is connected to at least one of the outer ring 212 of the front disc 201 and the outer ring 212 of the rear disc 202; and a structure located in the receiving hole 22 of the body 20 means that the structure is located in at least one of the receiving hole 22 of the front disc 201 and the receiving hole 22 of the rear disc 202.

[0062] All the windward plates 11 are rotatably connected to the inner ring 211 of the body 20, and all the air supply plates 12 are rotatably connected to the outer ring 212 of the body 20. The receiving holes 22 of the body 20 are located between the inner ring 211 of the body 20 and the outer ring 212 of the body 20. If the inner ring 211 of the body 20, the outer ring 212 of the body 20, and all the receiving holes 22 are projected onto the same plane perpendicular to the center 30 of the wind wheel, the projections of the receiving holes 22 are all located between the projection of the inner ring 211 and the projection of the outer ring 212. The projection of the inner ring 211 of the front disc 201 coincides with the projection of the inner ring 211 of the rear disc 202, and the projection of the outer ring 212 of the front disc 201 coincides with the projection of the outer ring 212 of the rear disc 202.

[0063] Optionally, for any one of the vanes 10, at least one of the windward plate 11 and the air supply plate 12 comprises a sliding portion 1221. The sliding portion 1221 of each vane 10 movably extends into the receiving hole 22 corresponding to the vane 10 and forms a sliding connection with the body 20. The sliding portion 1221 can be formed on the end of the windward plate 11 close to the air supply plate 12, on the end of the air supply plate 12 close to the windward plate 11, or on both the end of the windward plate 11 close to the air supply plate 12 and the end of the air supply plate 12 close to the windward plate 11. The sliding portion 1221 can extend into the receiving hole 22 of the front disc 201 and slide with the front disc 201, extend into the receiving hole 22 of the rear disc 202 and slide with the rear disc 202, or extend into the receiving hole 22 of the front disc 201 and the receiving hole 22 of the rear disc 202 and slide with both the front disc 201 and the rear disc 202.

[0064] Figures 2-3In the shown embodiment, the air supply plate 12 is rotatably connected to the outer ring 212 of the front disc 201 and the outer ring 212 of the rear disc 202, and the air supply plate 12 includes two outer connecting portions 121 in the shape of a pin shaft. The outer ring 212 of the front disc 201 and the outer ring 212 of the rear disc 202 are each provided with a plurality of hinge holes 24, the hinge holes 24 of the outer ring 212 of the front disc 201 and the hinge holes 24 of the outer ring 212 of the rear disc 202 are in one-to-one correspondence and in equal number, and any one of the hinge holes 24 of the front disc 201 and the corresponding hinge hole 24 of the rear disc 202 are arranged in a direction parallel to the center 30 of the wind wheel. One of the two outer connecting portions 121 away from the rear disc 202 extends into the hinge hole 24 of the outer ring 212 of the front disc 201 to be hingedly connected to the outer ring 212 of the front disc 201, and the other of the two outer connecting portions 121 away from the front disc 201 extends into the hinge hole 24 of the outer ring 212 of the rear disc 202 to be hingedly connected to the outer ring 212 of the rear disc 202.

[0065] It can be understood that in other embodiments, for any one of the fan blades 10, the air supply plate 12 can also have only one outer connecting portion 121 hingedly connected to the outer ring 212 of the front disc 201, or only one outer connecting portion 121 hingedly connected to the outer ring 212 of the rear disc 202.

[0066] Figures 2-3 In the shown embodiment, the front disc 201 is provided with a receiving hole 22, and the sliding connection portion 1221 is formed at one end of the air supply plate 12 close to the windward plate 11, the sliding connection portion 1221 is located in the receiving hole 22 of the front disc 201 and is in sliding connection with the inner ring 211 of the front disc 201, and the center of rotation between the windward plate 11 and the air supply plate 12 forms a bending center of the fan blade 10, which coincides with the axis of the sliding connection portion 1221.

[0067] The inner ring 211 of the main body 20 is also provided with a plurality of special-shaped holes 23 arranged around the center 30 of the wind wheel in the circumferential direction of the center 30 of the wind wheel, and the special-shaped holes 23 are in one-to-one correspondence and in equal number to the fan blades 10; for any one of the fan blades 10, the windward plate 11 includes an inner connecting portion 111 arranged in the special-shaped hole 23, and the inner connecting portion 111 of each fan blade 10 extends into the special-shaped hole 23 corresponding to the fan blade 10, the inner connecting portion 111 can rotate in the special-shaped hole 23 to realize the rotational connection between the windward plate 11 and the inner ring 211 of the main body 20, and the inner connecting portion 111 can also move in the special-shaped hole 23 to approach and move away from the center 30 of the wind wheel.

[0068] Figures 2-3In the shown embodiment, the special-shaped hole 23 is arranged in the inner ring 211 of the front disc 201, and the inner connecting part 111 is rotatably connected to the inner ring 211 of the front disc 201. In other embodiments, both ends of the windward plate 11 can be provided with the inner connecting part 111, and correspondingly, the inner ring 211 of the front disc 201 and the inner ring 211 of the rear disc 202 are provided with the special-shaped hole 23, and the inner connecting part 111 of both ends of the windward plate 11 is rotatably connected to the inner ring 211 of the front disc 201 and the inner ring 211 of the rear disc 202 respectively, so as to further improve the stability of the fan blade 10.

[0069] Referring to Figures 5-6 , Figures 7-8 , in the shown embodiment, the inner connecting part 111 can include a pin shaft fixed to the body of the windward plate 11, or can include a roller shaft rotatably mounted to the body of the windward plate 11, the outer connecting part 121 can include a pin shaft fixed to the body of the air supply plate 12, or can include a roller shaft rotatably mounted to the body of the air supply plate 12, the opening shape of the special-shaped hole 23 is larger than the radial cross-sectional shape of the inner connecting part 111, so that there is a gap between the inner wall of the special-shaped hole 23 and the inner connecting part 111, which allows the inner connecting part 111 to move close to and away from the wind wheel center 30 in the special-shaped hole 23, thereby providing space for the inner connecting part 111 to move relative to the body 20 to follow the deformation of the fan blade 10.

[0070] As shown in Figure 6 and Figure 8 , the special-shaped hole 23 includes a proximal end and a distal end, the proximal end is one end of the special-shaped hole 23 relatively close to the wind wheel center 30, and the distal end is one end of the special-shaped hole 23 relatively far away from the wind wheel center 30, Figure 6 , the included angle between the windward plate 11 and the air supply plate 12 of the fan blade 10 is 180°, and the size of the fan blade 10 in the radial direction of the wind wheel center 30 reaches the maximum, at this time, the inner connecting part 111 is located at the proximal end; Figure 8 , the included angle between the windward plate 11 and the air supply plate 12 of the fan blade 10 is reduced relative to Figure 6 , the size of the fan blade 10 in the radial direction of the wind wheel center 30 is reduced compared to Figure 6 , at this time, the inner connecting part 111 is located at the distal end.

[0071] Optionally, the inner ring 211 of the front disc 201 and the outer ring 212 of the front disc 201 are coaxially arranged, and the common axis of the two is the wind wheel center 30; the inner ring 211 of the rear disc 202 and the outer ring 212 of the rear disc 202 are coaxially arranged, and the common axis of the two is the wind wheel center 30; the inner ring 211 of the front disc 201 and the inner ring 211 of the rear disc 202, and the outer ring 212 of the front disc 201 and the outer ring 212 of the rear disc 202 are coaxially arranged with the wind wheel center 30 as the common axis. The axis of the outer connecting portion 121, the axis of the inner connecting portion 111, and the bending center of the fan blade 10 are all arranged parallel to the wind wheel center 30.

[0072] Further, the accommodating hole 22 is an arc-shaped hole 221, in any one group of corresponding arc-shaped holes 221 and fan blades 10, the center of the arc-shaped hole 221 is located on the axis of the hinge hole 24, the sliding portion 1221 extends into the arc-shaped hole 221 and can slide along the arc-shaped hole 221, so that the air supply plate 12 can swing relative to the body 20 with the axis of the hinge hole 24 as the swing center, with the air supply plate 12 swinging relative to the body 20 around the swing center, the windward plate 11 rotates relative to the body 20 and moves relative to the body 20.

[0073] Referring to Figure 2 , Figure 5 and Figure 7 , the arc-shaped hole 221 is arranged in the mounting area 21 of the front disc 201, the arc-shaped hole 221 and the hinge hole 24 of the front disc 201 are in one-to-one correspondence and have the same number, and the arc-shaped hole 221 and the special-shaped hole 23 of the front disc 201 are in one-to-one correspondence and have the same number. The center of any one arc-shaped hole 221 is located on the axis of the hinge hole 24 corresponding to the arc-shaped hole 221, so that the arc-shaped hole 221 limits the trajectory of the sliding portion 1221 sliding relative to the body to be a circular arc trajectory.

[0074] It can be understood that in other embodiments, the front disc 201 and the rear disc 202 are both provided with arc-shaped holes 221, and correspondingly, each fan blade 10 includes two sliding portions 1221, which respectively extend into the arc-shaped hole 221 of the front disc 201 and the arc-shaped hole 221 of the rear disc 202.

[0075] Referring to Figures 3-4 , in some embodiments, from the end far away from the air supply plate 12 to the end close to the air supply plate 12, the thickness of the windward plate 11 shows an increasing trend; from the end far away from the windward plate 11 to the end close to the windward plate 11, the thickness of the air supply plate 12 shows an increasing trend.

[0076] With this configuration, the mass ratio of the end of the windward plate 11 closest to the air supply plate 12 to the entire windward plate 11 is greater than the mass ratio of the end of the windward plate 11 furthest from the air supply plate 12 to the entire windward plate 11; similarly, the mass ratio of the end of the air supply plate 12 closest to the windward plate 11 to the entire air supply plate 12 is greater than the mass ratio of the end of the air supply plate 12 furthest from the windward plate 11 to the entire air supply plate 12. Ultimately, the mass of the fan blade 10 is more concentrated in the area where the windward plate 11 and the air supply plate 12 connect, making it easier for the fan blade 10 to switch to the air guiding mode.

[0077] It is understood that in other embodiments, a counterweight structure can also be provided for the fan blade 10. The counterweight structure can be fixedly installed at one end of the windward plate 11 near the air supply plate 12, or it can be fixedly installed at one end of the air supply plate 12 near the windward plate 11.

[0078] Through the above-described structure and connection arrangements, the centrifugal impeller 100 of the present invention can produce the following operational effects: Figures 5-6 For example, Figure 6 The diagram illustrates one possible configuration of the fan blades 10 when the centrifugal impeller 100 is stationary. In this configuration, the inner connecting portion 111 is located near the proximal end of the irregularly shaped hole 23, and the sliding portion 1221 is located in the middle of the arc-shaped hole 221. It should be noted that the configuration of the fan blades 10 is not limited to one form when the centrifugal impeller 100 is stationary; it can have multiple configurations, the reasons for which will be explained in detail later.

[0079] See Figures 7-8 , Figure 8 This illustrates the centrifugal impeller 100 in... Figure 7 The shape of the fan blade 10 when rotating counterclockwise from a certain perspective is tentatively defined as follows: the centrifugal impeller 100 is in... Figure 7 From a visual perspective, counterclockwise rotation is the forward rotation working state. Since the sliding part 1221 can slide within the arc-shaped hole 221, when the main body 20 starts high-speed counterclockwise rotation, the outer connecting part 121 and the inner connecting part 111 are driven by the main body 20 first. The area where the wind-facing plate 11 and the air-supplying plate 12 are connected lags behind the outer connecting part 121 and the inner connecting part 111 due to inertia. Therefore, the sliding part 1221 slides relative to the main body 20 along the arc-shaped hole 221 and approaches one end of the arc-shaped hole 221, so as to drive the wind-facing plate 11 to swing clockwise, while the air-supplying plate 12 swings counterclockwise with the outer connecting part 121 as the center.

[0080] With the main body 20 as the frame of reference, when the centrifugal impeller 100 enters the forward rotation working state, the windward plate 11 will swing under the action of centrifugal force. On the one hand, the windward plate 11 swings relative to the air supply plate 12 with the axis of the sliding joint 1221 as the center; on the other hand, the inner connecting part 111 moves away from the proximal end of the irregular hole 23 and moves closer to the distal end of the irregular hole 23 until the main body 20 enters a stable forward rotation state, at which point the inner connecting part 111 abuts against the distal end. With the observer as the frame of reference, the distal end provides centripetal force to the windward plate 11 by abutting against the inner connecting part 111.

[0081] See Figures 11-12 , Figure 12 This illustrates the centrifugal impeller 100 in... Figure 11 The shape of the fan blade 10 when rotating clockwise from a certain perspective is specified for the centrifugal impeller 100. Figure 11 From a visual perspective, clockwise rotation indicates the reverse working state. Similarly, when the main body 20 starts high-speed clockwise rotation, the outer connecting part 121 and the inner connecting part 111 are driven by the main body 20 first. The area where the wind-facing plate 11 and the air-supplying plate 12 are connected lags behind the outer connecting part 121 and the inner connecting part 111 due to inertia. Therefore, the sliding part 1221 slides relative to the main body 20 along the arc-shaped hole 221 and approaches the other end of the arc-shaped hole 221 to drive the wind-facing plate 11 to swing counterclockwise, while the air-supplying plate 12 swings clockwise with the outer connecting part 121 as the center.

[0082] With the main body 20 as the frame of reference, when the centrifugal impeller 100 enters the reverse working state, the wind-facing plate 11 will swing under the action of centrifugal force. On the one hand, the wind-facing plate 11 swings relative to the air supply plate 12 around the axis of the sliding joint 1221. On the other hand, the inner connecting part 111 moves away from the proximal end of the irregular hole 23 and approaches the distal end of the irregular hole 23 until the main body 20 enters a stable reverse state, at which point the inner connecting part 111 abuts against the distal end. With the observer as the frame of reference, the distal end provides centripetal force to the wind-facing plate 11 by abutting against the inner connecting part 111.

[0083] Therefore, the centrifugal impeller 100 has two blade 10 configurations in both forward and reverse rotation states, respectively. Figure 8 The forward rotation working condition shown and Figure 12 The reverse operating conditions shown can also be referred to as the first air guiding mode and the second air guiding mode of the fan blade 10. The two different air guiding modes correspond to the two different operating conditions. When the fan blade 10 is in the first air guiding mode, the shape and extension direction of the exhaust channel can meet the exhaust requirements when the centrifugal impeller 100 rotates forward. When the fan blade 10 is in the second air guiding mode, the shape and extension direction of the exhaust channel can meet the exhaust requirements when the centrifugal impeller 100 rotates in reverse.

[0084] In fact, the present application does not particularly limit the shape of the fan blade 10 in the stationary state of the centrifugal fan wheel 100. Regardless of the shape of the fan blade 10 when the body 20 is stationary, as long as the body 20 is started at high speed in the forward direction, the fan blade 10 will spontaneously switch to the first air guide shape shown in FIG. 1A under the action of inertia. Similarly, as long as the body 20 is started at high speed in the reverse direction, the fan blade 10 will spontaneously switch to the second air guide shape shown in FIG. 1B under the action of inertia. Figure 8 In fact, the present application does not particularly limit the shape of the fan blade 10 in the stationary state of the centrifugal fan wheel 100. Regardless of the shape of the fan blade 10 when the body 20 is stationary, as long as the body 20 is started at high speed in the forward direction, the fan blade 10 will spontaneously switch to the first air guide shape shown in FIG. 1A under the action of inertia. Similarly, as long as the body 20 is started at high speed in the reverse direction, the fan blade 10 will spontaneously switch to the second air guide shape shown in FIG. 1B under the action of inertia. Figure 12 In fact, the present application does not particularly limit the shape of the fan blade 10 in the stationary state of the centrifugal fan wheel 100. Regardless of the shape of the fan blade 10 when the body 20 is stationary, as long as the body 20 is started at high speed in the forward direction, the fan blade 10 will spontaneously switch to the first air guide shape shown in FIG. 1A under the action of inertia. Similarly, as long as the body 20 is started at high speed in the reverse direction, the fan blade 10 will spontaneously switch to the second air guide shape shown in FIG. 1B under the action of inertia. Figure 8 In fact, the present application does not particularly limit the shape of the fan blade 10 in the stationary state of the centrifugal fan wheel 100. Regardless of the shape of the fan blade 10 when the body 20 is stationary, as long as the body 20 is started at high speed in the forward direction, the fan blade 10 will spontaneously switch to the first air guide shape shown in FIG. 1A under the action of inertia. Similarly, as long as the body 20 is started at high speed in the reverse direction, the fan blade 10 will spontaneously switch to the second air guide shape shown in FIG. 1B under the action of inertia. Figure 12 In fact, the present application does not particularly limit the shape of the fan blade 10 in the stationary state of the centrifugal fan wheel 100. Regardless of the shape of the fan blade 10 when the body 20 is stationary, as long as the body 20 is started at high speed in the forward direction, the fan blade 10 will spontaneously switch to the first air guide shape shown in FIG. 1A under the action of inertia. Similarly, as long as the body 20 is started at high speed in the reverse direction, the fan blade 10 will spontaneously switch to the second air guide shape shown in FIG. 1B under the action of inertia.

[0085] When the body 20 is in a stable forward rotation state, the fan blade 10 maintains the first air guide shape, the resultant force of the inner wall of the hinged hole 24 and the inner wall of the arc-shaped hole 221 acting on the air supply plate 12 is the centripetal force of the air supply plate 12 and remains unchanged, and the resultant force of the inner wall of the arc-shaped hole 221 and the far end of the special-shaped hole 23 acting on the air-facing plate 11 is the centripetal force of the air-facing plate 11 and remains unchanged. When the body 20 is in a stable reverse rotation state, the fan blade 10 maintains the second air guide shape, the resultant force of the inner wall of the hinged hole 24 and the inner wall of the arc-shaped hole 221 acting on the air supply plate 12 is the centripetal force of the air supply plate 12 and remains unchanged, and the resultant force of the inner wall of the arc-shaped hole 221 and the far end of the special-shaped hole 23 acting on the air-facing plate 11 is the centripetal force of the air-facing plate 11 and remains unchanged.

[0086] It can be understood that in other embodiments, the positions of the special-shaped hole 23 and the inner connecting portion 111 can be interchanged, i.e., the special-shaped hole 23 can also be provided on the air-facing plate 11, and the inner connecting portion 111 is provided on the inner ring 211 of the body 20. The positions of the hinged hole 24 and the outer connecting portion 121 can also be interchanged, i.e., the hinged hole 24 can also be provided on the air supply plate 12, and the outer connecting portion 121 is provided on the outer ring 212 of the body 20. In addition, the mounting area 21 of the rear disc 202 can also be provided with the arc-shaped hole 221 and the special-shaped hole 23. When the mounting area 21 of the rear disc 202 is provided with the arc-shaped hole 221 and the special-shaped hole 23, the arc-shaped hole 221 and the special-shaped hole 23 of the mounting area 21 of the front disc 201 can continue to be retained or cancelled.

[0087] It is worth mentioning that in other embodiments, the inner connecting part 111 of the windward plate 11 can also be hingedly connected to the inner ring 211 of the body 20, and correspondingly, the outer connecting part 121 of the air supply plate 12 is rotatably connected to the outer ring 212 of the body 20. To this end, the outer ring 212 of the body 20 is provided with a special-shaped hole 23 for the outer connecting part 121 to extend into, and the special-shaped hole 23 provided in the outer ring 212 of the body 20 and the outer connecting part 121 extending into it have a gap therebetween, which is configured to allow the outer connecting part 121 to move relative to the body 20, and the displacement of the outer connecting part 121 relative to the body 20 has a component in the radial direction of the wind wheel center 30. The accommodating hole 22 of the body 20 is a reversely curved arc-shaped hole 221, that is, the center of the reversely curved arc-shaped hole 221 is the center of the hinge hole 24 provided in the inner ring 211 of the body 20, and the rotation center of the windward plate 11 and the inner ring 211 of the body 20 passes through the center of the reversely curved arc-shaped hole 221.

[0088] Further, the shortest distance line from the axis of the hinge hole 24 to the wind wheel center 30 is the median line of the connecting line of the two ends of the arc-shaped hole 221, as shown in Figure 6 、 Figure 8 and Figure 12 The shape of the arc-shaped hole 221 includes four curve segments, which are a first circular arc segment with the axis of the hinge hole 24 as the center, a second circular arc segment with the axis of the hinge hole 24 as the center, a stop end 222 connected to the left end of the first circular arc segment and the left end of the second circular arc segment, and a stop end 222 connected to the right end of the first circular arc segment and the right end of the second circular arc segment. The two stop ends 222 are also circular arcs, and the connecting line of the centers of the two stop ends 222 is the connecting line of the two ends of the arc-shaped hole 221.

[0089] In this way, the fan blade 10 in the first wind guiding mode and the fan blade 10 in the second wind guiding mode are symmetrically arranged, and the symmetry center of the two is the shortest distance line from the outer connecting part 121 of the fan blade 10 to the wind wheel center 30. As shown in Figure 10 , Figure 10 The shape of the fan blade 10 when the body 20 rotates around the wind wheel center 30 is shown, at this time, the shape of the fan blade 10 is exactly the wind guiding shape corresponding to the working state of the centrifugal wind wheel 100, and the included angle α' is formed between the circumferential velocity direction of the windward plate 11 and the inner connecting part 111, the supplementary angle of α' is α, and 40°≤α≤60°; the included angle β is formed between the circumferential velocity direction of the air supply plate 12 and the outer connecting part 121, and 110°≤β≤170°. The circumferential velocity directions of the inner connecting part 111 and the outer connecting part 121 are respectively indicated by arrows V1 and V2.

[0090] The circumferential speed V1 of the inner connecting part 111 refers to the speed of the inner connecting part 111 when it rotates with the body 20 around the wind wheel center 30, which is the speed required for the centrifugal force formed on the inner connecting part 111. If a first cylindrical surface is made with the distance from the wind wheel center 30 to the inner connecting part 111 as the radius and with the wind wheel center 30 as the axis, the circumferential speed direction of the inner connecting part 111 is tangent to the first cylindrical surface. Similarly, the circumferential speed direction V2 of the outer connecting part 121 refers to the speed of the outer connecting part 121 when it rotates with the body 20 around the wind wheel center 30, which is the speed required for the centrifugal force formed on the outer connecting part 121. If a second cylindrical surface is made with the distance from the wind wheel center 30 to the outer connecting part 121 as the radius and with the wind wheel center 30 as the axis, the circumferential speed direction of the outer connecting part 121 is tangent to the second cylindrical surface.

[0091] The supplementary angle a of a' is defined as the inlet angle of the fan blade 10 in the field of the centrifugal wind wheel 100, and β is defined as the outlet angle of the fan blade 10 in the field of the centrifugal wind wheel 100. The inlet angle is generally described as the included angle between the circumferential speed direction of the end of the fan blade 10 close to the wind wheel center 30 and the windward plate 11 during the stable rotation of the centrifugal wind wheel 100; and the outlet angle is generally described as the included angle between the circumferential speed direction of the end of the fan blade 10 far from the wind wheel center 30 and the air delivery part during the stable rotation of the centrifugal wind wheel 100.

[0092] In the present application, the inner connecting part 111 forms the end of the fan blade 10 close to the wind wheel center 30, and the outer connecting part 121 forms the end of the fan blade 10 far from the wind wheel center 30. Therefore, when the fan blade 10 is in the first air guiding mode or the second air guiding mode, the range of the inlet angle is 40°-60°, and the range of the outlet angle is 110°-170°.

[0093] Through the above structural arrangement, the centrifugal wind wheel 100 of the present application has excellent air blowing performance. The fan blade 10 in the first air guiding mode has substantially the same shape as the fan blade of the conventional forward rotation type centrifugal wind wheel, so that the air blowing effect of the centrifugal wind wheel 100 in the forward rotation is close to that of the conventional forward rotation type centrifugal wind wheel, and the air blowing effect of the centrifugal wind wheel 100 in the reverse rotation is also close to that of the conventional reverse rotation type centrifugal wind wheel. The fan blade 10 in the second air guiding mode has substantially the same shape as the fan blade of the conventional reverse rotation type centrifugal wind wheel. The gas entering the air inlet passage can smoothly enter the air exhaust passage between the fan blades 10 under the guidance of the windward plate 11, and the air delivery part can promote the gas to be discharged from the air exhaust passage as soon as possible, thereby improving the gas conveying effect of the centrifugal wind wheel 100.

[0094] Optionally, referring to Figure 9In any one of the fan blades 10, the rotation centers of the windward plate 11 and the air supply plate 12 form a bending center of the fan blade 10, the distance from the axis of the outer connecting portion 121 to the bending center is L1, the distance from the axis of the inner connecting portion 111 to the bending center is L2, and 1.3≤L1 / L2≤2.

[0095] Further, the windward plate 11 and the air supply plate 12 are in contact through a curved surface and form a sealing fit, the curved surface contact can eliminate the gap between the windward plate 11 and the air supply plate 12, and can avoid the air flow from one side of the fan blade 10 to the other side of the fan blade 10, thereby eliminating the phenomenon of gas transfer between different exhaust channels caused by the split design of the fan blade 10, avoiding the generation of vortex or unnecessary wind loss or wind pressure loss, and further consolidating the blowing performance of the centrifugal fan 100.

[0096] Specifically, one of the windward plate 11 and the air supply plate 12 is provided with a rotating groove 112, and the other includes a rotating shaft 1222, the inner wall of the rotating groove 112 is an inner cylindrical surface, the rotating shaft 1222 and the rotating groove 112 are coaxially arranged, and form a rotating sealing fit therebetween.

[0097] Optionally, the sliding portion 1221 and the rotating shaft 1222 are coaxially arranged.

[0098] Further, one of the windward plate 11 and the air supply plate 12 is provided with a rotating groove 112, and the other includes a rotating shaft 1222, the inner wall of the rotating groove 112 is an inner cylindrical surface, the rotating shaft 1222 and the rotating groove 112 are coaxially arranged, and form a rotating sealing fit therebetween.

[0099] Figures 3-4 In the illustrated embodiment, the anti-disengagement portion 113 and the rotating groove 112 are arranged on the windward plate 11, and the rotating shaft 1222 is arranged on the end of the air supply plate 12 close to the windward plate 11. In order to ensure that the rotating shaft 1222 is always in rotating fit with the inner wall of the rotating groove 112 and prevent the rotating connection between the windward plate 11 and the air supply plate 12 from failing, the opening width of the C-shaped groove 114 is smaller than the outer diameter of the rotating shaft 1222, and no matter how the angle between the windward plate 11 and the air supply plate 12 changes, the anti-disengagement portion 113 is always sleeved on the rotating shaft 1222, so that the rotating shaft 1222 and the rotating groove 112 are always coaxial.

[0100] Optionally, the air supply plate 12 is further provided with an avoiding groove 123, in the axial direction of the rotating shaft 1222, the size of the avoiding groove 123 in the axial direction of the rotating shaft 1222 corresponds to the length interval of the rotating shaft 1222 adapting the anti-disengagement part 113, and the outer cylindrical surface of the rotating shaft 1222 participates in forming part of the boundary of the avoiding groove 123. The two arc-shaped anti-disengagement clamping plates of the anti-disengagement part 113 can rotate along the outer cylindrical surface of the rotating shaft 1222 to enter the avoiding groove 123, preventing the anti-disengagement part 113 and the air supply plate 12 from interfering due to the change of the angle between the air supply plate 12 and the air inlet plate 11, ensuring that the air supply plate 12 and the air inlet plate 11 can smoothly realize relative rotation, and ultimately will not affect the air guiding form of the fan blade 10. The anti-disengagement part 113 not only can improve the connection stability between the air supply plate 12 and the air inlet plate 11, but also plays a role in adding counterweight to the fan blade 10.

[0101] It can be understood that in other embodiments, the avoiding groove 123 and the rotating shaft 1222 can also be formed in the air inlet plate 11, and correspondingly, the anti-disengagement part 113 is formed in the air supply plate 12.

[0102] Figures 3-4 In the illustrated embodiment, the sliding connection part 1221 and the rotating shaft 1222 are both arranged at the end of the air supply plate 12 relatively close to the air inlet plate 11, and in other embodiments, one of the sliding connection part 1221 and the rotating shaft 1222 can be arranged at the end of the air inlet plate 11 close to the air supply plate 12, and the other one of the sliding connection part 1221 and the rotating shaft 1222 can be arranged at the end of the air supply plate 12 close to the air inlet plate 11, and the sliding connection part 1221 and the rotating shaft 1222 can also be both arranged at the end of the air inlet plate 11 relatively close to the air supply plate 12.

[0103] In other embodiments, the sliding connection part 1221 can also be a roller rotatably installed at the end of the air inlet plate 11 close to the air supply plate 12, or a roller rotatably installed at the end of the air supply plate 12 close to the air inlet plate 11, so that the sliding connection part 1221 and the inner wall of the arc-shaped hole 221 are in rolling contact, which can significantly reduce the resistance of the sliding connection part 1221 sliding along the arc-shaped hole 221, and promote the air supply plate 12 to swing rapidly around the axis of the outer connecting part 121 to rapidly change the outlet angle.

[0104] In other embodiments, the inner ring 211 of the body 20 is provided with a plurality of hinge holes 24 arranged around the center 30 of the wind wheel, the outer ring 212 of the body 20 is provided with a plurality of special-shaped holes 23 arranged around the center 30 of the wind wheel, the windward plate 11 comprises an inner connecting part 111 arranged in the hinge hole 24 and hinged to the inner ring of the body 20, the air supply plate 12 comprises an outer connecting part 121 arranged in the special-shaped hole 23, the outer connecting part 121 is capable of moving towards and away from the center 30 of the wind wheel in the special-shaped hole 23, correspondingly, the accommodating hole 22 is an arc-shaped hole 221, the center of the arc-shaped hole 221 is located on the axis of the hinge hole 24, when the body 20 starts to rotate from the static state, the windward plate 11 rotates relative to the body 20 with the axis of the hinge hole 24 as the swing center, and the air supply plate 12 rotates relative to the body 20 and moves relative to the body 20 at the same time.

[0105] It is worth noting that the accommodating hole 22 is not a necessary structure to achieve the improvement purpose of the present application, in other embodiments, the accommodating hole 22 can also be cancelled, and an arc-shaped slide rail can also be arranged on the body 20 to replace the accommodating hole 22, the arc-shaped slide rail is located between the inner ring 211 and the outer ring 212 of the body 20, and the windward plate 11 and / or the air supply plate 12 comprises a sliding part 1221 which is in movable cooperation with the arc-shaped slide rail. The center of the arc of the arc-shaped slide rail is located on the axis of the outer connecting part 121, or on the axis of the inner connecting part 111. The forms of the hinge hole 24, the special-shaped hole 23 and the accommodating hole 22 can be through holes or blind holes.

[0106] The present application also provides a fan (not shown in the figure), which comprises the centrifugal wind wheel 100 provided by the present application.

[0107] The centrifugal wind wheel of the present application adopts a split structure fan blade, not only the fan blade can move relative to the body, but also the windward plate and the air supply plate constituting the fan blade can rotate relative to each other to change the shape of the fan blade. By using the inertia property of the fan blade, when the body starts to rotate from the static state, the inertia accelerations of different positions on the fan blade are different, since the body will first apply force to the inner connecting part and the outer connecting part, the inertia acceleration of the end of the windward plate close to the air supply plate is smaller than the inertia acceleration of the inner connecting part, and the inertia acceleration of the end of the air supply plate close to the windward plate is smaller than the inertia acceleration of the outer connecting part. When the body rotates forward, the connection part of the windward plate and the air supply plate has a tendency to reverse relative to the center of the wind wheel, and when the body reverses, the connection part of the windward plate and the air supply plate has a tendency to rotate forward relative to the center of the wind wheel, therefore, no matter whether the body rotates forward or reverses, the shape of the fan blade can spontaneously switch to the air guide shape adapting to the current rotation direction of the body, without manual adjustment by personnel.

[0108] The technical features of the above-mentioned embodiments can be combined in any way, in order to make the description simple, not all possible combinations of the technical features in the above-mentioned embodiments are described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0109] Those skilled in the art will realize that the above embodiments are merely illustrative of the application and should not be construed as limiting the same. Any suitable changes and modifications to the above embodiments are considered to fall within the scope of the present application as defined by the claims.

Claims

1. A centrifugal fan wheel, characterized in that The fan comprises a body (20) having a wind wheel center (30) and a plurality of blades (10) arranged around the wind wheel center (30), the body (20) comprises a mounting area (21) around the wind wheel center (30), and a power transmission part for connecting an external driving structure, the axis of the power transmission part is the wind wheel center (30), the blades (10) are mounted on the mounting area (21), The mounting area (21) comprises an inner ring (211) around the wind wheel center (30), and an outer ring (212) around the inner ring (211) radially outside the inner ring (211), Each of the blades (10) comprises a windward plate (11) rotatably connected to the inner ring (211), and a blower plate (12) rotatably connected to the outer ring (212), in any one of the blades (10), the windward plate (11) and the blower plate (12) are rotatably connected; the windward plate (11) comprises an inner connecting part (111), and the blower plate (12) comprises an outer connecting part (121), The rotation center of the windward plate (11) and the blower plate (12) forms a bending center of the blade (10), the distance from the outer connecting part (121) to the bending center is L1, the distance from the inner connecting part (111) to the bending center is L2, 1.3≤L1 / L2≤2; and / or, When the body (20) rotates around the wind wheel center (30), an included angle α' is formed between the circumferential velocity direction of the windward plate (11) and the inner connecting part (111), the supplementary angle of α' is α, 40°≤α≤60°; An included angle β is formed between the circumferential velocity direction of the blower plate (12) and the outer connecting part (121), 110°≤β≤170°, Wherein: The outer ring (212) is provided with a plurality of hinge holes (24) for the outer connecting part (121) to hinge, the inner ring (211) is provided with a plurality of special-shaped holes (23), the blower plate (12) is hinged to the body (20) around the axis of the hinge hole (24), the inner connecting part (111) is arranged in the special-shaped hole (23), and the special-shaped hole (23) allows the inner connecting part (111) to move close to and away from the wind wheel center (30); Or, The inner ring (211) is provided with a plurality of hinge holes (24) for the inner connecting part (111) to hinge, the outer ring (212) is provided with a plurality of special-shaped holes (23), the windward plate (11) is hinged to the body (20) around the axis of the hinge hole (24), the outer connecting part (121) is arranged in the special-shaped hole (23), and the special-shaped hole (23) allows the outer connecting part (121) to move close to and away from the wind wheel center (30).

2. The centrifugal fan wheel of claim 1, wherein A plurality of the special-shaped holes (23) are arranged around the wind wheel center (30), and a plurality of the hinge holes (24) are arranged around the wind wheel center (30).

3. The centrifugal fan wheel according to claim 1 or 2, characterized in that The inner ring (211) and the outer ring (212) further have a plurality of accommodating holes (22) arranged around the center (30) of the wind wheel, and the windward plate (11) and / or the air supply plate (12) further comprises a sliding connection part (1221) which extends into the accommodating hole (22) and is slidingly connected to the body (20).

4. The centrifugal fan wheel of claim 3, wherein The accommodating hole (22) is an arc-shaped hole (221).

5. The centrifugal fan wheel of claim 4, wherein A plurality of the hinge holes (24) are arranged on the outer ring (212) and around the center (30) of the wind wheel, and the shortest distance line from the hinge hole (24) to the center (30) of the wind wheel is the perpendicular bisector of the line connecting the two ends of the arc-shaped hole (221).

6. The centrifugal fan wheel of claim 3 wherein, The rotation center of the windward plate (11) and the air supply plate (12) forms a bending center of the fan blade (10), and the bending center coincides with the axis of the sliding connection part (1221).

7. The centrifugal fan wheel according to claim 1 or 2, characterized in that The thickness of the windward plate (11) increases from one end of the windward plate (11) away from the air supply plate (12) to the other end of the windward plate (11) connected to the air supply plate (12); and / or, The thickness of the air supply plate (12) increases from one end of the air supply plate (12) away from the windward plate (11) to the other end of the air supply plate (12) connected to the windward plate (11).

8. The centrifugal fan wheel according to claim 1 or 2, characterized in that The windward plate (11) and the air supply plate (12) are curvedly matched and sealingly matched.

9. The centrifugal fan wheel of claim 8, wherein One of the windward plate (11) and the air supply plate (12) comprises a rotating shaft (1222), and the other one is provided with a rotating groove (112), the inner wall of the rotating groove (112) is an inner cylindrical surface, the rotating shaft (1222) and the rotating groove (112) are coaxially arranged, and the rotating shaft (1222) and the rotating groove (112) are rotationally and sealingly matched.

10. The centrifugal fan wheel of claim 9, wherein One of the windward plate (11) and the air supply plate (12) which is provided with the rotating groove (112) comprises an anti-falling part (113) having a C-shaped groove (114).

11. The centrifugal fan wheel of claim 10, wherein One of the windward plate (11) and the air supply plate (12) which comprises the rotating shaft (1222) is provided with an avoiding groove (123), the size of the avoiding groove (123) in the axial direction of the rotating shaft (1222) corresponds to the length interval of the rotating shaft (1222) matched with the anti-falling part (113), and the anti-falling part (113) is configured to be able to rotate along the outer cylindrical surface of the rotating shaft (1222) into the avoiding groove (123).

12. A fan, characterized by The fan comprises the centrifugal wind wheel according to any one of claims 1-11.

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