Fan, hot air unit and baking cooking equipment

Abstract

The utility model provides a fan, hot air unit and baking cooking equipment, the fan includes main part and at least one bi-directional turbulent flow part, the main part has the axial line to be used as the rotation center of fan, the bi-directional turbulent flow part includes first fan blade and second fan blade, the first fan blade and the second fan blade are distributed along the circumferential direction of the main part in a staggered manner, and the two parts deflect in the radial direction relative to the main body part in different rotating directions, and the interval width between the two parts is gradually reduced in the direction far away from the axial line.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical appliances, in particular to a fan, a hot air unit and a baking cooking device. Background Art

[0002] Ovens and steam ovens both belong to baking cooking devices. Such devices generate a circulating hot air flow through a hot air unit to gradually cook food materials. The hot air unit includes a heat pipe and a fan for disturbing air. The air flow disturbed by the fan is thrown out of the fan along the radial and tangential directions of the fan, and then flows through the heat pipe on the outer peripheral side of the fan and is heated to form a hot air flow.

[0003] Traditional fans are only suitable for the working conditions of rotating and disturbing the flow in a single rotation direction. In order to improve the uniformity of baking and cooking of food materials, some baking cooking devices are equipped with fans that can rotate forward and backward alternately, that is, the fan changes the rotation direction at a certain conversion frequency during the rotation process.

[0004] However, the performance of the currently available fans suitable for forward and backward alternating rotation needs to be improved. Whether rotating forward or backward, the air volume and air speed generated by such fans are limited, and the initial speed of the air flow thrown out of the fan is low, resulting in insufficient momentum of the hot air flow. Summary of the Utility Model

[0005] In view of this, the utility model provides a fan, a hot air unit and a baking cooking device that are suitable for forward and backward alternating rotation and can increase the air volume and air speed of the hot air flow.

[0006] The fan provided by the utility model includes a main body part and at least one two-way flow disturbing part. The main body part has an axial line to serve as the rotation center of the fan. The two-way flow disturbing part includes a first fan blade and a second fan blade. The first fan blade and the second fan blade are arranged staggeredly along the circumferential direction of the main body part. They respectively deflect relative to the radial direction of the main body part with different rotation directions, and the interval width between them decreases along the direction away from the axial line.

[0007] Compared with the prior art, the fan of the utility model has the following beneficial effects:

[0008] 1) It is suitable for the working conditions of forward and backward alternating rotation. When the fan rotates forward, one of the first fan blade and the second fan blade pushes air and throws the air flow out of the fan along the radial direction of the main body part and the tangential direction of the two-way flow disturbing part. When the fan rotates backward, the other of the first fan blade and the second fan blade pushes air and throws the air flow out of the fan along the radial direction of the main body part and the tangential direction of the two-way flow disturbing part;

[0009] 2) The first blade and the second blade are both arranged to be yawed. When the first blade pushes the air, it can provide a radial acceleration for the airflow contacting the first blade, so that the airflow obtains more velocity vectors flowing radially outward along the main body, thereby increasing the wind speed of the hot air flow. When the second blade pushes the air, it can provide a radial acceleration for the airflow contacting the second blade, so that the airflow obtains more velocity vectors flowing radially outward along the main body, thereby increasing the wind speed of the hot air flow;

[0010] 3) Compared with the blades extending radially along the fan carried by the existing fans, the first blade and the second blade carried by the fan of the present invention are larger in size. When the fan rotates and pushes the air, the contact area of the first blade and the second blade with the air is larger, so that more air can be driven to accelerate the air to form a hot air flow, thereby increasing the air volume of the hot air flow.

[0011] In some embodiments, the side of the first blade relatively far from the second blade is the third turbulence side, and the side of the second blade relatively far from the first blade is the fourth turbulence side. The interval width between the third turbulence side and the fourth turbulence side decreases in the direction away from the axial line.

[0012] With such an arrangement, when the fan rotates forward, the fourth turbulence side serves as the windward side of the second blade, and the velocity of the air contacting the fourth turbulence side can be decomposed into two components, namely the tangential component along the tangent of the second blade and the radial component pointing away from the axial line along the radial direction of the main body. When the fan rotates in the reverse direction, the third turbulence side serves as the windward side of the first blade, and the velocity of the air contacting the third turbulence side can be decomposed into two components, namely the tangential component along the tangent of the first blade and the radial component pointing away from the axial line along the radial direction of the main body.

[0013] In some embodiments, a plurality of bidirectional turbulence parts are configured. The plurality of bidirectional turbulence parts are arranged around the axial line and form an intermediate air inlet area. In any two adjacent bidirectional turbulence parts, a wind leakage cavity communicating with the intermediate air inlet area is formed between the first blade of one of them and the second blade of the other. The width of the wind leakage cavity changes in an increasing trend in the direction away from the axial line.

[0014] With such an arrangement, when the fan rotates forward, the return air flow that returns from the inner container cavity of the baking cooking device to the hot air unit can enter the air discharge cavity between any two adjacent two-way turbulence parts from the middle air inlet area. Then, the air flow entering the air discharge cavity is disturbed by the fourth turbulence side of the second fan blade to accelerate the air flow. When the fan rotates in the reverse direction, the return air flow that returns from the inner container cavity of the baking cooking device to the hot air unit can enter the air discharge cavity between any two adjacent two-way turbulence parts from the middle air inlet area. Then, the air flow entering the air discharge cavity is disturbed by the third turbulence side of the first fan blade to accelerate the air flow. Along the direction away from the axial line, the width of the air discharge cavity gradually widens to facilitate the air flow accelerated by the first fan blade or the second fan blade in the air discharge cavity to be thrown out.

[0015] In some embodiments, each air discharge cavity has an air discharge opening that opens radially along the main body part.

[0016] With such an arrangement, when the fan rotates forward, the air discharge opening allows the air pushed by the fourth turbulence side of the second fan blade located on one side of the air discharge cavity to leave the air discharge cavity, thereby forming a hot air flow that is thrown out of the fan. When the fan rotates in the reverse direction, the air discharge opening allows the air pushed by the third turbulence side of the first fan blade located on the other side of the air discharge cavity to leave the air discharge cavity, thereby forming a hot air flow that is thrown out of the fan.

[0017] In some embodiments, in any two adjacent two-way turbulence parts, the first fan blade of one of them is symmetric with the second fan blade of the other about a preset radial base plane. The preset radial base plane bisects the air discharge cavity and includes the axial line.

[0018] With such an arrangement, when the fan rotates forward and in the reverse direction at the same rate, the velocity vectors of the air in contact with the fourth turbulence side and the velocity vectors of the air in contact with the third turbulence side are symmetric about the preset radial base plane. Therefore, regardless of whether the fan rotates forward or in the reverse direction, the hot air has substantially the same radial velocity vector component, that is, the magnitudes of the initial velocities of the hot air flow thrown out of the fan are substantially equal. Thus, it can ensure that the ingredients are evenly baked when the fan rotates forward and backward alternately.

[0019] In some embodiments, the connection line between the end of the first fan blade relatively far from the axial line and the axial line is the third connection line, and the maximum angle between the first fan blade and the third connection line is 30°; and / or,

[0020] The connection line between the end of the second fan blade relatively far from the axial line and the axial line is the fourth connection line, and the minimum angle between the second fan blade and the fourth connection line is 30°.

[0021] With such a setting, when the fan rotates, it can ensure the acceleration of the airflow disturbed by the first fan blade and the second fan blade, so as to endow the airflow velocity with more velocity vectors along the radial direction of the main body. At the same time, it can prevent the yaw angles of the first fan blade and the second fan blade from being too large, thereby reducing the obstruction of the first fan blade and the second fan blade to the air entering the air discharge cavity and avoiding insufficient air volume entering the air discharge cavity and weakening the air volume.

[0022] In some embodiments, the connection line between the end of the first fan blade relatively far from the axial line and the axial line is the third connection line, and the connection line between the end of the second fan blade relatively far from the axial line and the axial line is the fourth connection line. The angle between the first fan blade and the third connection line is ∠1, and the angle between the second fan blade and the fourth connection line is ∠2, and ∠1 = ∠2.

[0023] With such a setting, when the fan rotates forward and backward at the same rate, for any two-way flow disturbing part, the radial velocity vector imparted to the airflow by the fourth flow disturbing side is basically equal to the radial velocity vector imparted to the airflow by the third flow disturbing side, and the tangential velocity vector imparted to the airflow by the fourth flow disturbing side is also basically equal to the tangential velocity vector imparted to the airflow by the third flow disturbing side. Therefore, it can ensure that the food ingredients are evenly baked when the fan rotates forward and backward alternately.

[0024] In some embodiments, the two-way flow disturbing part further includes a third fan blade extending along the radial direction of the main body, and the first fan blade and the second fan blade are arranged at the end of the third fan blade relatively close to the axial line.

[0025] With such a setting, when the fan rotates forward, the air disturbed by the two-way flow disturbing part first contacts the second fan blade. The air accelerates and flows close to the third fan blade under the disturbing action of the fourth flow disturbing side, and then flows radially outward along the third fan blade. During this process, the third fan blade adjusts the velocity direction of the airflow from the fourth flow disturbing side to avoid interference with the airflow thrown out from other two-way flow disturbing parts. When the fan rotates backward, the air disturbed by the two-way flow disturbing part first contacts the first fan blade. The air accelerates and flows close to the third fan blade under the disturbing action of the third flow disturbing side, and then flows radially outward along the third fan blade. During this process, the third fan blade approximately adjusts the velocity direction of the airflow from the fourth flow disturbing side to avoid interference with the airflow thrown out from other two-way flow disturbing parts.

[0026] In some embodiments, the end of the first fan blade far from the axial line is disconnected from the third fan blade; and / or, the end of the second fan blade far from the axial line is disconnected from the third fan blade; and / or, the end of the first fan blade far from the axial line is disconnected from the end of the second fan blade far from the axial line.

[0027] With such a setting, when the fan rotates forward, the discontinuous gap formed between the second fan blade and the third fan blade allows air flow to pass through. Therefore, a pressure difference is formed in the area near the discontinuous gap, that is, the pressure on the windward side of the third fan blade is greater than the pressure on the leeward side of the third fan blade. The pressure difference enables the air flow along the fourth turbulent flow side to approach the windward side of the third fan blade more quickly, thereby accelerating the radial outward flow of the air along the main body; when the fan rotates in the reverse direction, the discontinuous gap formed between the first fan blade and the third fan blade allows air flow to pass through. Therefore, a pressure difference is formed in the area near the discontinuous gap, that is, the pressure on the windward side of the third fan blade is greater than the pressure on the leeward side of the third fan blade. The pressure difference enables the air flow along the third turbulent flow side to approach the windward side of the third fan blade more quickly, thereby accelerating the radial outward flow of the air along the main body; when the fan rotates forward, the discontinuous gap formed between the first fan blade and the second fan blade allows the air located between the first fan blade and the second fan blade to pass through this discontinuous gap to be discharged from the fan. When the fan rotates in the reverse direction, the discontinuous gap formed between the first fan blade and the second fan blade allows the air located between the first fan blade and the second fan blade to pass through this discontinuous gap to be discharged from the fan. Therefore, the air volume of the fan can be increased.

[0028] In some embodiments, the radial length of the bidirectional turbulent flow part is L, and the radial length of the third fan blade is L 1 , 0 ≤ L 1 ≤ 0.7L.

[0029] With such a setting, it is ensured that the first fan blade and the second fan blade have sufficient length dimensions, so that after the air flow contacts the first fan blade or the second fan blade, it can obtain sufficient velocity vectors radially outward along the main body, thereby better achieving the purpose of increasing the air volume and air speed of the hot air flow.

[0030] The hot air unit provided by the present utility model includes a driving member and a fan. The driving member includes an output shaft connected to the main body part. The output shaft is coaxial with the axial line, and the driving member can control the output shaft to rotate forward and backward alternately.

[0031] The baking and cooking equipment provided by the present utility model includes a hot air unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a three-dimensional schematic diagram of the fan according to an embodiment of the present utility model;

[0033] Figure 2 is Figure 1 the front view of the fan shown;

[0034] Figure 3 is Figure 2 the partial enlarged schematic diagram of the fan shown at B.

[0035] Reference numerals: 10, main body; 20, two-way spoiler; 21, first blade; 212, third spoiler side; 22, second blade; 222, fourth spoiler side; 23, third blade; 24, accommodation cavity; 25, air discharge cavity; 26, disconnection gap; 27, middle air inlet area. Detailed implementation manners

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention in this specification are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more of the related listed items.

[0038] The present invention provides a fan and a hot air unit including the fan. In addition, a baking and cooking device including the hot air unit is also provided. The baking and cooking device may specifically be a microwave oven, a steam oven, etc. The hot air unit further includes a driving member connected to the fan and a heating element disposed on the outer peripheral side of the fan. The heating element may be a heat pipe surrounding the fan in the circumferential direction of the fan. During the rotation of the fan, air is pushed to form an air flow. After the air flow is thrown out of the fan, it flows through the heating element and is heated to form a hot air flow. In addition to the hot air unit, the baking and cooking device further includes an inner container assembly having an inner container cavity and a door panel for closing the inner container cavity. The inner container cavity is used to accommodate food materials and the hot air flow. The door panel is disposed at an interval from the hot air unit. The inner container cavity is located between the hot air unit and the door panel. The hot air flow enters the inner container cavity and flows close to the door panel to heat the food materials. Subsequently, the hot air flow turns around and forms a return air flow approaching the hot air unit. As the fan continues to rotate, the return air flow is disturbed by the fan and becomes a hot air flow again. Thus, the circulation of the hot air flow between the hot air unit and the inner container cavity is realized, and the food materials are continuously heated until they are cooked.

[0039] Refer to Figures 1 to 2The fan of the utility model includes a main body 10 and at least one bidirectional spoiler 20. The main body 10 is generally in a sheet-like structure and has an axial line passing through the center of the main body 10 in a direction perpendicular to the extension direction of the main body 10. The axial line is used as the rotation center of the fan when it rotates. The driving member includes an output shaft connected to the main body 10. The axis of the output shaft coincides with the axial line. The driving member can control the output shaft to rotate alternately in forward and reverse directions, thereby driving the fan to rotate alternately in forward and reverse directions around the axial line. If the fan is observed from the side of the fan away from the driving member in a line of sight parallel to the axial line, as shown in FIG. Figure 2 , when the driving part drives the fan to rotate in the forward direction, Figure 2 The fan shown rotates clockwise. When the drive element drives the fan to rotate in the reverse direction, Figure 2 The fan shown rotates counterclockwise, and the alternating forward and reverse rotation means that the fan switches back and forth between clockwise rotation and counterclockwise rotation at a certain switching frequency.

[0040] The bidirectional spoiler 20 is connected to the main body 10. When the number of the bidirectional spoiler 20 is multiple, the multiple bidirectional spoilers 20 surround the axial line along the circumference of the main body 10 and are arranged at intervals from each other. Each bidirectional spoiler 20 includes a first blade 21 and a second blade 22, and the first blade 21 and the second blade 22 both protrude from the main body 10 along the length direction of the axial line. When the fan rotates forward, one of the first blade 21 and the second blade 22 serves as the main blade for pushing air to accelerate the airflow, and when the fan rotates reversely, the other of the first blade 21 and the second blade 22 serves as the main blade for pushing air to accelerate the airflow. The first blade 21 and the second blade 22 are arranged in a staggered manner along the circumference of the main body 10. If the first blade 21 and the second blade 22 of any bidirectional spoiler 20 are centrally projected with the axial line as the projection center, and the cylindrical surface with the axis coinciding with the axial line is used as the projection surface, the graphics of the first blade 21 and the second blade 22 on the projection surface do not overlap each other.

[0041] It should be noted that the circumferential direction of the main body 10 refers to the circumferential direction around the axial line, and is also the circumferential direction of the fan; the radial direction of the main body 10 refers to the direction perpendicular to the axial line, and is also the radial direction of the fan. For the hot air unit used in the baking cooking equipment, the fan carried by the hot air unit is a centrifugal fan, and the number of spoilers of the centrifugal fan is usually 5 to 10. Therefore, for the fan of the utility model, the number of the bidirectional spoilers 20 can also be configured to be 5 to 10 and is not limited to 5 to 10.

[0042] The first blade 21 and the second blade 22 of each bidirectional spoiler 20 are respectively arranged with different rotation directions in a radial yaw relative to the radial direction of the main body 10, and the spacing width between the first blade 21 and the second blade 22 changes in a decreasing trend along the radial direction of the main body 10 and away from the axial line. The first blade 21 includes a first proximal end and a first distal end, the second blade 22 includes a second proximal end and a second distal end, the first proximal end is the end of the first blade 21 close to the axial line, the first distal end is the end of the first blade 21 away from the axial line, the second proximal end is the end of the second blade 22 close to the axial line, and the second distal end is the end of the second blade 22 away from the axial line. The connection line between the first proximal end and the axial line and the connection line between the first distal end and the axial line are arranged staggeredly along the circumferential direction of the main body 10, and the connection line between the second proximal end and the axial line and the connection line between the second distal end and the axial line are arranged staggeredly along the circumferential direction of the main body 10.

[0043] Refer to Figures 2 to 3 , in some embodiments, for each bidirectional spoiler 20, the side of the first blade 21 relatively far from the second blade 22 is the third spoiler side 212, and the side of the second blade 22 relatively far from the first blade 21 is the fourth spoiler side 222. When the fan rotates forward, the fourth spoiler side 222 serves as the windward side of the second blade 22 to push air to generate an air flow. When the fan rotates in the reverse direction, the third spoiler side 212 serves as the windward side of the first blade 21 to push air to generate an air flow. The spacing width between the third spoiler side 212 and the fourth spoiler side 222 changes in a decreasing trend along the radial direction of the main body 10 in an orientation away from the axial line. The angle formed between the third spoiler side 212 and the fourth spoiler side 222 has an opening facing the axial line and a vertex facing away from the axial line.

[0044] Refer to Figures 2 to 3 , for any bidirectional spoiler 20, if the fan is observed from the side of the fan away from the driving member in a line-of-sight direction parallel to the axial line, the connection line between the first proximal end and the axial line is located on the counterclockwise side of the connection line between the first distal end and the axial line, and the connection line between the second proximal end and the axial line is located on the clockwise side of the connection line between the second distal end and the axial line. The first blade 21 is arranged to yaw relative to the connection line between the first proximal end and the axial line in a clockwise direction around the first proximal end, and the second blade 22 is arranged to yaw relative to the connection line between the second proximal end and the axial line in a counterclockwise direction around the second proximal end.

[0045] Such as Figure 3As shown, when the fan rotates clockwise in the forward direction driven by the driving member, the fourth spoiler side 222 serves as the main surface for pushing air. At this time, the pushing speed of the fourth spoiler side 222 for pushing air is represented by arrow V1. The pushing speed can be decomposed into a tangential speed along the tangential orientation of the double-sided spoiler portion 20 and a radial speed along the radial direction of the main body portion 10 and away from the axial line. The tangential speed and the radial speed are represented by arrow V3 and arrow V2 respectively. The radial speed V2 causes the air to accelerate and flow out along the radial direction of the main body portion 10. When the air flow is thrown out of the fan, the initial speed of the air flow ensures that after the air flow is heated and warmed up, a hot air flow with greater kinetic energy is formed, so that the hot air flow can heat the food ingredients more fully. When the fan rotates counterclockwise in the reverse direction driven by the driving member, the third spoiler side 212 serves as the main surface for pushing air. At this time, the pushing speed of the third spoiler side 212 for pushing air can also be decomposed into a tangential speed along the tangential orientation of the double-sided spoiler portion 20 and a radial speed along the radial direction of the main body portion 10 and away from the axial line. Therefore, when the fan rotates counterclockwise in the reverse direction, the initial speed obtained when the air flow is thrown out of the fan is still sufficient to maintain the generation of a hot air flow with greater kinetic energy.

[0046] Furthermore, a ventilation cavity 25 is provided at intervals between every two adjacent double-sided spoiler portions 20. The ventilation cavity 25 between any two adjacent double-sided spoiler portions 20 is specifically located between the third spoiler side 212 of the first fan blade 21 of one double-sided spoiler portion 20 and the fourth spoiler side 222 of the second fan blade 22 of another double-sided spoiler portion 20. One end of the plurality of double-sided spoiler portions 20 relatively close to the axial line is arranged in a circumferential direction around the axial line along the main body portion 10, and an intermediate air inlet area 27 is surrounded. Any ventilation cavity 25 communicates with the intermediate air inlet area 27 surrounded by the plurality of double-sided spoiler portions 20. The width of each ventilation cavity 25 changes in an increasing trend along the direction away from the axial line. When the hot air flow turns around in the inner tank cavity and forms a return air flow flowing towards the hot air unit, the return air flow first enters the intermediate air inlet area 27, and then enters the ventilation cavity 25 under the action of centrifugal force and thus reaches the windward surfaces of the first fan blade 21 and the second fan blade 22.

[0047] Refer to Figures 1 to 2 , one end of the double-sided spoiler portion 20 relatively close to the axial line includes the first proximal end of the first fan blade 21 and the second proximal end of the second fan blade 22. Along the circumferential direction of the fan, a plurality of first proximal ends and a plurality of second proximal ends are arranged alternately one by one around the axial line, so as to surround and form the intermediate air inlet area 27. The adjacent first proximal end and second proximal end respectively belong to two double-sided spoiler portions 20, and the adjacent first proximal end and second proximal end are spaced apart from each other so that the intermediate air inlet area 27 communicates with each ventilation cavity 25.

[0048] With such a setting, when the fan rotates forward, the return air flow that returns from the inner tank cavity to the hot air unit first enters the middle air inlet area 27, then enters each air discharge cavity 25, and then the air flow entering each air discharge cavity 25 reaches the two-way flow disturbing part 20 on one side of the air discharge cavity 25. The second fan blade 22 of the two-way flow disturbing part 20 pushes the air flow to accelerate through the fourth flow disturbing side 222 so that the air flow is thrown out of the fan; when the fan rotates in the reverse direction, the return air flow that returns from the inner tank cavity to the hot air unit first enters the middle air inlet area 27, then enters each air discharge cavity 25, and then the air flow entering each air discharge cavity 25 reaches the two-way flow disturbing part 20 on one side of the air discharge cavity 25. The first fan blade 21 of the two-way flow disturbing part 20 pushes the air flow to accelerate through the third flow disturbing side 212 so that the air flow is thrown out of the fan.

[0049] Furthermore, each air discharge cavity 25 has an air discharge opening. The air discharge openings of each air discharge cavity 25 are located between the two two-way flow disturbing parts 20 on both sides of the air discharge cavity 25, and the air discharge openings are radially open along the main body part 10. If the fan is observed from the side away from the driving part in the line-of-sight direction parallel to the axial line, the air discharge opening is an arc. One end of the arc is the first distal end of the first fan blade 21 of one of the two-way flow disturbing parts 20, and the other end of the arc is the second distal end of the second fan blade 22 of the other two-way flow disturbing part 20. The air discharge opening allows the air pushed by the third flow disturbing side 212 and the fourth flow disturbing side 222 to leave the air discharge cavity 25. When the air flow entering the air discharge cavity 25 leaves the air discharge cavity 25 from the air discharge opening under the push of the third flow disturbing side 212 or the fourth flow disturbing side 222, the air flow is thrown out of the fan.

[0050] Furthermore, for any two adjacent two-way flow disturbing parts 20, the first fan blade 21 of one of them and the second fan blade 22 of the other are symmetric about a preset radial reference plane. The preset radial reference plane is a plane containing the axial line, and the preset radial reference plane bisects the air discharge cavity 25 between the first fan blade 21 and the second fan blade 22. With such a setting, when the forward rotation speed of the fan is equal to the reverse rotation speed, the pushing speed vector of the fourth flow disturbing side 222 of the second fan blade 22 on one side of the preset radial reference plane pushing the air and the pushing speed vector of the third flow disturbing side 212 of the first fan blade 21 on the other side of the preset radial reference plane pushing the air are symmetric about the preset radial reference plane. Therefore, the radial speed vectors generated by the fourth flow disturbing side 222 pushing the air and the third flow disturbing side 212 pushing the air are basically equal. In addition, the tangential speed vectors generated by the fourth flow disturbing side 222 pushing the air and the third flow disturbing side 212 pushing the air have basically equal vector magnitudes and opposite vector directions. Therefore, whether the fan rotates forward or backward, the wind force and air volume of the hot air flow provided by the fan are basically equal, which is beneficial to evenly baking the food materials so that all parts of the food materials are evenly cooked.

[0051] In some embodiments, the bidirectional spoiler 20 further includes a third fan blade 23 extending radially along the main body 10. The first fan blade 21 and the second fan blade 22 are both disposed at one end of the third fan blade 23 relatively close to the axial line. Therefore, on the basis of the first fan blade 21 and the second fan blade 22, the third fan blade 23 can also push the air and accelerate the air to form an air flow. If the fan is observed from the side away from the driving member in the line-of-sight direction parallel to the axial line, the air discharge opening is an arc. One end of the arc is the distal end of the third fan blade 23 of one of the bidirectional spoilers 20, and the other end of the arc is the distal end of the third fan blade 23 of the other bidirectional spoiler 20. The distal end of the third fan blade 23 is the end of the third fan blade 23 relatively far from the axial line. The first fan blade 21, the second fan blade 22 and the third fan blade 23 form a Y-shaped figure. The third spoiler side 212 and the fourth spoiler side 222 are symmetric about a preset radial base plane, which is a plane including the axial line. The third fan blade 23 is parallel to the preset radial base plane. When the fan rotates forward, one side of the third fan blade 23 and the fourth spoiler side 222 jointly act as the windward side to push the air. When the fan rotates backward, the other side of the third fan blade 23 and the third spoiler side 212 jointly act as the windward side to push the air.

[0052] With such a setting, when the rotation speed of the fan in the forward rotation is equal to the rotation speed in the reverse rotation, the pushing speed vectors of the air pushed by the fourth spoiler side 222 and the pushing speed vectors of the air pushed by the third spoiler side 212 are symmetric about the preset radial base plane. Therefore, the radial speed vectors generated by the fourth spoiler side 222 pushing the air and the radial speed vectors generated by the third spoiler side 212 pushing the air are basically equal. In addition, the tangential speed vectors generated by the fourth spoiler side 222 pushing the air and the tangential speed vectors generated by the third spoiler side 212 pushing the air have basically equal vector magnitudes and opposite vector directions. Therefore, whether the fan rotates forward or backward, the wind force and air volume of the hot air flow provided by the fan are basically equal, which is beneficial to evenly baking the food ingredients so that all parts of the food ingredients are evenly cooked.

[0053] It can be understood that in some other embodiments, the third fan blade 23 may not be provided and only the first fan blade 21 and the second fan blade 22 may be provided. If the fan is observed from the side away from the driving member in the line-of-sight direction parallel to the axial line, the first fan blade 21 and the second fan blade 22 form a V-shaped figure.

[0054] Optionally, refer to Figure 3, if the connection line from the first distal end of the first fan blade 21 to the axial line is denoted as the third connection line, and the connection line from the second distal end of the second fan blade 22 to the axial line is denoted as the fourth connection line, then the angle between the first fan blade 21 and the third connection line is represented by ∠1, and ∠1 is the yaw angle of the first fan blade 21 relative to the third connection line in the clockwise direction around the first distal end. The maximum value of ∠1 is 30°. The angle between the second fan blade 22 and the fourth connection line is represented by ∠2, and ∠2 is the yaw angle of the second fan blade 22 relative to the fourth connection line in the counterclockwise direction around the second distal end. The maximum value of ∠2 is 30°. The maximum value of the yaw angle of the first fan blade 21 relative to the third connection line in the clockwise direction around the first distal end is 150°, and the maximum value of the yaw angle of the second fan blade 22 relative to the fourth connection line in the counterclockwise direction around the second distal end is 150°. As a preferred solution, ∠1 = ∠2, that is, the yaw angle of the first fan blade 21 relative to the third connection line in the clockwise direction around the first distal end = the yaw angle of the second fan blade 22 relative to the fourth connection line in the counterclockwise direction around the second distal end.

[0055] It can be understood that when ∠1 and ∠2 are larger, the numerical value of the radial velocity vector generated by the fourth spoiler side 222 and the third spoiler side 212 pushing the air is larger. However, if ∠1 and ∠2 are too large, it is easy to cause the airflow to be blocked when it is thrown out of the fan. The reason is that if ∠1 and ∠2 are too large, for any two adjacent two-way spoiler parts 20, the first proximal end of the first fan blade 21 of one two-way spoiler part 20 and the second proximal end of the second fan blade 22 of the other two-way spoiler part 20 will be too close, which means that the minimum width of the air leakage cavity 25 between the two two-way spoiler parts 20 is smaller. Therefore, the return airflow entering the middle air inlet area 27 will be difficult to enter the air leakage cavity 25, resulting in a decrease in the amount of air entering the air leakage cavity 25, and ultimately weakening the air volume of the fan. The above angle limitations on ∠1 and ∠2 ensure a larger radial velocity vector for the hot air flow while taking into account the air volume of the hot air flow.

[0056] In other embodiments, it is also possible to adopt the setting method of ∠1 ≠ ∠2, that is, the yaw angle of the first fan blade 21 relative to the third connection line in the clockwise direction around the first distal end ≠ the yaw angle of the second fan blade 22 relative to the fourth connection line in the counterclockwise direction around the second distal end.

[0057] Further, refer to Figures 1 to 3, in some embodiments, the second distal end is disconnected from one end of the third fan blade 23 relatively close to the axial line, and a fourth disconnection gap 26 is formed therebetween; the first distal end is disconnected from one end of the third fan blade 23 relatively close to the axial line, and a fifth disconnection gap 26 is formed therebetween; the first distal end is disconnected from the second distal end, and a sixth disconnection gap 26 is formed therebetween. With such an arrangement, when the fan rotates forward, the fourth disconnection gap 26 allows the air flow to pass through and flow to the leeward side of the third fan blade 23. At this time, the air pressure on the windward side of the third fan blade 23 is greater than the air pressure on the leeward side of the third fan blade 23. The pressure difference enables the air flow attached to the fourth turbulent flow side 222 to approach the third fan blade 23 more quickly, thereby accelerating the air flow to be thrown out of the fan. At the same time, the sixth disconnection gap 26 allows the air between the first fan blade 21 and the second fan blade 22 to pass through and be thrown out of the fan together; when the fan rotates in the reverse direction, the fifth disconnection gap 26 allows the air flow to pass through and flow to the leeward side of the third fan blade 23. At this time, the air pressure on the windward side of the third fan blade 23 is greater than the air pressure on the leeward side of the third fan blade 23. The pressure difference enables the air flow attached to the third turbulent flow side 212 to approach the third fan blade 23 more quickly, thereby accelerating the air flow to be thrown out of the fan. At the same time, the sixth disconnection gap 26 allows the air between the first fan blade 21 and the second fan blade 22 to pass through and be thrown out of the fan together.

[0058] Further, the radial length of the bidirectional turbulent flow portion 20 is L, and the radial length of the third fan blade 23 is L 1 , 0 ≤ L 1 ≤ 0.7L. The measurement process of the radial length L of the bidirectional turbulent flow portion 20 is as follows: along the radial orientation of the main body portion 10, the distance from one end of the third fan blade 23 relatively far from the axial line to the end of the first proximal end and the second proximal end that is farther from the axial line is denoted as L. In particular, the fourth disconnection gap 26, the fifth disconnection gap 26, and the sixth disconnection gap 26 do not exceed 3 mm.

[0059] Figures 1 to 3The fan shown is applicable to the operating conditions of alternating forward and reverse rotation. When the fan rotates forward, the second fan blade 22 of each two-way spoiler 20 pushes air and throws the air flow out of the fan along the radial direction of the main body 10 and the tangential direction of the two-way spoiler 20. When the fan rotates in reverse, the first fan blade 21 of each two-way spoiler 20 pushes air and throws the air flow out of the fan along the radial direction of the main body 10 and the tangential direction of the two-way spoiler 20. Both the first fan blade 21 and the second fan blade 22 are arranged with a yaw relative to the radial direction of the main body 10, and their yaw directions relative to the main body 10 are different. Whether the fan rotates forward or backward, the first fan blade 21 and the second fan blade 22 can impart more velocity vectors radially outward along the main body 10 to the air flow thrown out of the fan, thus increasing the wind speed of the hot air flow. In contrast, the fan blades of existing fans extend along the radial direction of the fan, while the first fan blade 21 and the second fan blade 22 of the fan of the present utility model are longer and have a larger area of the windward surface for pushing air, so that more air can be driven to accelerate the air to form a hot air flow, thereby increasing the air volume of the hot air flow.

[0060] It should be noted that neither the windward surface nor the leeward side of the third fan blade 23 is fixed. When the rotation direction of the fan changes, the windward surface of the third fan blade 23 will be used as the leeward side of the third fan blade 23, and the leeward side of the third fan blade 23 will be used as the windward surface of the third fan blade 23.

[0061] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0062] Those of ordinary skill in the art of this technology should recognize that the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. As long as it is within the scope of the essential spirit of the present utility model, appropriate changes and variations made to the above embodiments fall within the scope of protection required by the present utility model.

Claims

1. A fan, characterized in that: The fan comprises a main body (10) and at least one bidirectional spoiler (20), wherein the main body (10) has an axial line serving as the rotation center of the fan, and the bidirectional spoiler (20) comprises a first blade (21) and a second blade (22), wherein the first blade (21) and the second blade (22) are arranged in a staggered manner along the circumference of the main body (10), and the first blade (21) and the second blade (22) are radially deflected relative to the main body (10) in different rotation directions, and the spacing width between the first blade (21) and the second blade (22) decreases in a direction away from the axial line.

2. The fan according to claim 1, characterized in that The side of the first fan blade (21) relatively far away from the second fan blade (22) is a third spoiler side (212), and the side of the second fan blade (22) relatively far away from the first fan blade (21) is a fourth spoiler side (222), and the interval width between the third spoiler side (212) and the fourth spoiler side (222) decreases in a direction away from the axial line.

3. The fan according to claim 2, characterized in that The bidirectional spoiler (20) is configured in plurality, and the plurality of bidirectional spoilers (20) are arranged around the axial line and surround an intermediate air inlet area (27), and in any two adjacent bidirectional spoilers (20), an air discharge cavity (25) connected to the intermediate air inlet area (27) is formed between the first blade (21) of one and the second blade (22) of the other.

4. The fan according to claim 3, characterized in that The width of the air leakage cavity (25) changes in an increasing trend in a direction away from the axial line; and / or, Each of the air leakage chambers (25) has an air leakage opening, and the air leakage opening is open along the radial direction of the main body (10); and / or, In any two adjacent bidirectional spoiler portions (20), the first blade (21) of one and the second blade (22) of the other are symmetrical about a preset radial base plane, and the preset radial base plane divides the air discharge cavity (25) into two equal parts and includes the axial line.

5. The fan according to claim 1, characterized in that A line connecting an end of the first blade (21) relatively far from the axial line to the axial line is a third line, and a maximum angle between the first blade (21) and the third line is 30°; and / or, A line from one end of the second blade (22) relatively far from the axial line to the axial line is a fourth line, and a minimum angle between the second blade (22) and the fourth line is 30°.

6. The fan according to claim 5, characterized in that A line from one end of the first blade (21) relatively far from the axial line to the axial line is a third line, a line from one end of the second blade (22) relatively far from the axial line to the axial line is a fourth line, an angle between the first blade (21) and the third line is ∠1, an angle between the second blade (22) and the fourth line is ∠2, and ∠1=∠2.

7. The fan according to claim 1, characterized in that The bidirectional spoiler (20) further comprises a third blade (23) extending radially along the main body (10), and the first blade (21) and the second blade (22) are arranged at an end of the third blade (23) relatively close to the axial line.

8. The fan according to claim 7, characterized in that One end of the first blade (21) away from the axial line is disconnected from the third blade (23); and / or one end of the second blade (22) away from the axial line is disconnected from the third blade (23); and / or one end of the first blade (21) away from the axial line is disconnected from one end of the second blade (22) away from the axial line.

9. The fan according to claim 7, characterized in that: The radial length of the bidirectional spoiler (20) is L, and the radial length of the third blade (23) is L1, where 0≤L1≤0.7L.

10. A hot air unit, characterized in that: The invention comprises a driving member and the fan according to any one of claims 1 to 9, wherein the driving member comprises an output shaft connected to the main body (10), the output shaft is coaxial with the axial line, and the driving member can control the output shaft to rotate alternately in forward and reverse directions.

11. A baking and cooking device, characterized in that: Comprising the hot air unit as claimed in claim 10.

Images