Fan, hot air unit, and baking cooking apparatus

Abstract

The application provides a fan, a hot air unit and a baking cooking device. The fan comprises a main body part and at least one bidirectional turbulence part. The main body part has an axial line serving as the rotation center of the fan. The bidirectional turbulence part comprises a first fan blade and a second fan blade. The first fan blade and the second fan blade are arranged in a staggered manner along the circumference of the main body part, and respectively have different rotational directions relative to the radial deflection of the main body part. The interval width of the first fan blade and the second fan blade decreases in the direction away from the axial line.

Description

Technical Field

[0001] This invention relates to the field of electrical technology, and more particularly to a fan, a hot air unit, and a baking and cooking device. Background Technology

[0002] Ovens and steam ovens are both baking and cooking equipment. These devices use a hot air unit to generate a circulating hot airflow to gradually cook the food. The hot air unit includes heat pipes and a fan for turbulent airflow. The airflow turbulent by the fan is thrown out of the fan along the radial and tangential directions of the fan, and then flows through the heat pipes located on the outer periphery of the fan and is heated to form a hot airflow.

[0003] Traditional fans are only suitable for situations where the airflow is disturbed by rotating in a single direction. In order to improve the uniformity of food baking and cooking, some baking and cooking equipment are equipped with fans that can rotate in both directions alternately, that is, the fan changes its rotation direction at a certain frequency during rotation.

[0004] However, the performance of fans that are currently suitable for alternating forward and reverse rotation needs to be improved. Regardless of whether they rotate forward or backward, these fans produce limited air volume and speed, and the initial velocity of the airflow thrown out of the fan is low, resulting in insufficient momentum of the hot airflow. Summary of the Invention

[0005] In view of this, the present invention provides a fan, a hot air unit, and a baking and cooking device that are suitable for alternating forward and reverse rotation and can increase the air volume and wind speed of hot airflow.

[0006] The fan provided by the present invention includes a main body and at least one bidirectional turbulence section. The main body has an axial line as the rotation center of the fan. The bidirectional turbulence section includes a first blade and a second blade. The first blade and the second blade are staggered along the circumference of the main body. They are respectively swayed radially relative to the main body with different rotation directions, and the spacing between them decreases in the direction away from the axial line.

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

[0008] 1) Applicable to operating conditions where the fan rotates in both directions. When the fan is rotating in the forward direction, one of the first and second blades pushes the air and throws the airflow out of the fan along the radial direction of the main body and the tangential direction of the bidirectional turbulence section. When the fan is rotating in the reverse direction, the other of the first and second blades pushes the air and throws the airflow out of the fan along the radial direction of the main body and the tangential direction of the bidirectional turbulence section.

[0009] 2) Both the first and second fan blades are oscillating. When the first fan blade pushes the air, it can provide radial acceleration to the airflow that contacts the first fan blade, so that the airflow can obtain more velocity vectors that flow radially outward along the main body, thereby increasing the wind speed of the hot airflow. When the second fan blade pushes the air, it can provide radial acceleration to the airflow that contacts the second fan blade, so that the airflow can obtain more velocity vectors that flow radially outward along the main body, thereby increasing the wind speed of the hot airflow.

[0010] 3) Compared with the fan blades that extend radially along the fan in the existing fan, the first and second fan blades of the fan of the present invention are larger in size. When the fan rotates and pushes the air, the first and second fan blades have a larger contact area with the air, so they can drive more air to accelerate the air and 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 that is relatively far away from the second blade is the third turbulence side, and the side of the second blade that is relatively far away from the first blade is the fourth turbulence side. The spacing between the third turbulence side and the fourth turbulence side decreases in the direction away from the axial line.

[0012] With this configuration, when the fan rotates in the forward direction, the fourth turbulence side serves as the windward surface of the second blade. The velocity of the air in contact with the fourth turbulence side can be decomposed into two components: a tangential component along the tangent of the second blade and a radial component along the radial direction of the main body, pointing away from the axial line. When the fan rotates in the reverse direction, the third turbulence side serves as the windward surface of the first blade. The velocity of the air in contact with the third turbulence side can be decomposed into two components: a tangential component along the tangent of the first blade and a radial component along the radial direction of the main body, pointing away from the axial line.

[0013] In some embodiments, multiple bidirectional turbulence sections are configured, arranged around the axial line and forming a central air intake area. In any two adjacent bidirectional turbulence sections, a venting cavity connecting the central air intake area is formed between the first blade of one section and the second blade of the other section. The width of the venting cavity changes in an increasing trend along the direction away from the axial line.

[0014] With this configuration, when the fan rotates in the forward direction, the return airflow from the inner cavity of the baking and cooking equipment to the hot air unit can enter the vent cavity between any two adjacent bidirectional turbulence sections from the middle air intake area. Then, the airflow entering the vent cavity is disturbed and accelerated by the fourth turbulence side of the second fan blade. When the fan rotates in the reverse direction, the return airflow from the inner cavity of the baking and cooking equipment to the hot air unit can enter the vent cavity between any two adjacent bidirectional turbulence sections from the middle air intake area. Then, the airflow entering the vent cavity is disturbed and accelerated by the third turbulence side of the first fan blade. Along the direction away from the axial line, the width of the vent cavity gradually widens so that the airflow accelerated by the first or second fan blade can be thrown out of the vent cavity.

[0015] In some embodiments, each vent chamber has a vent opening that opens radially along the body portion.

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

[0017] In some embodiments, in any two adjacent bidirectional turbulence sections, the first blade of one section and the second blade of the other section are symmetrical about a preset radial base plane, which divides the air vent cavity into two equal parts and includes an axial line.

[0018] With this configuration, when the fan rotates forward and backward at the same rate, the velocity vector of the air contacting the fourth turbulence side and the velocity vector of the air contacting the third turbulence side are symmetrical about the preset radial base plane. Therefore, regardless of whether the fan rotates forward or backward, the hot air has essentially the same radial velocity vector component, that is, the magnitude of the initial velocity of the hot airflow thrown out of the fan is essentially equal, thus ensuring that the food is baked evenly when the fan rotates forward and backward alternately.

[0019] In some embodiments, the line connecting the end of the first blade relatively away from the axial line to the axial line is the third line, and the maximum included angle between the first blade and the third line is 30°; and / or,

[0020] The line connecting the end of the second blade that is furthest from the axial line to the axial line is the fourth line, and the minimum angle between the second blade and the fourth line is 30°.

[0021] This configuration ensures that the first and second blades accelerate the airflow disturbance when the fan rotates, thereby giving the airflow a greater velocity vector along the radial direction of the main body. At the same time, it prevents the first and second blades from having excessive yaw angles, thereby reducing the obstruction effect of the first and second blades on the air entering the venting chamber and avoiding insufficient airflow that would weaken the air volume.

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

[0023] With this configuration, when the fan rotates forward and backward at the same rate, for any one of the bidirectional turbulence sections, the radial velocity vector assigned to the airflow by the fourth turbulence side is basically equal to the radial velocity vector assigned to the airflow by the third turbulence side, and the tangential velocity vector assigned to the airflow by the fourth turbulence side is also basically equal to the tangential velocity vector assigned to the airflow by the third turbulence side. Therefore, it can be ensured that the food is baked evenly when the fan rotates forward and backward alternately.

[0024] In some embodiments, the bidirectional spoiler also includes a third blade extending radially along the main body, with the first and second blades located at the ends of the third blade that are relatively close to the axial line.

[0025] With this configuration, when the fan rotates in the forward direction, the air disturbed by the bidirectional turbulence section first contacts the second blade. Under the disturbance of the fourth turbulence side, the air accelerates and flows closer to the third blade, then flows radially outward along the third blade towards the main body. During this process, the third blade adjusts the speed and direction of the airflow from the fourth turbulence side to avoid interference with the airflow thrown out from other bidirectional turbulence sections. When the fan rotates in the reverse direction, the air disturbed by the bidirectional turbulence section first contacts the first blade. Under the disturbance of the third turbulence side, the air accelerates and flows closer to the third blade, then flows radially outward along the third blade towards the main body. During this process, the third blade adjusts the approximate speed and direction of the airflow from the fourth turbulence side to avoid interference with the airflow thrown out from other bidirectional turbulence sections.

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

[0027] With this configuration, when the fan rotates in the forward direction, the gap between the second and third blades allows airflow to pass through, thus creating a pressure difference in the vicinity of the gap. Specifically, the pressure on the windward side of the third blade is greater than the pressure on the leeward side. This pressure difference causes the airflow along the fourth turbulence side to accelerate towards the windward side of the third blade, thereby accelerating the radial outward flow of the airflow along the main body. When the fan rotates in the reverse direction, the gap between the first and third blades allows airflow to pass through, thus creating a pressure difference in the vicinity of the gap, specifically the pressure on the windward side of the third blade. The pressure difference on the leeward side of the third blade is greater than that on the third blade. This pressure difference allows the airflow along the third turbulence side to move closer to the windward side of the third blade, thereby accelerating the radial outward flow of the airflow along the main body. When the fan rotates in the forward direction, the gap formed between the first and second blades allows the air located between the first and second blades to pass through this gap and be ejected from the fan. When the fan rotates in the reverse direction, the gap formed between the first and second blades allows the air located between the first and second blades to pass through this gap and be ejected from the fan, thus increasing the fan's airflow.

[0028] In some embodiments, the radial length of the bidirectional spoiler is L, and the radial length of the third blade is L1, where 0 ≤ L1 ≤ 0.7L.

[0029] This configuration ensures that the first and second blades have sufficient length so that the airflow can obtain a sufficient radial outward velocity vector after contacting the first or second blade, thereby better achieving the goal of increasing the airflow volume and speed of the hot airflow.

[0030] The hot air unit provided by the present invention includes a driving component and a fan. The driving component includes an output shaft connected to the main body. The output shaft is coaxial with the axial line. The driving component can control the output shaft to rotate alternately in both directions.

[0031] The baking and cooking equipment provided by the present invention includes a hot air unit. Attached Figure Description

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

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

[0034] Figure 3 for Figure 2 The diagram shows a partial enlarged view of the fan at point B.

[0035] Reference numerals: 10, main body; 20, bidirectional turbulence section; 21, first fan blade; 212, third turbulence side; 22, second fan blade; 222, fourth turbulence side; 23, third fan blade; 24, condensation cavity; 25, venting cavity; 26, disconnection gap; 27, intermediate air intake zone. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] 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 invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] This invention provides a fan and a hot air unit including the fan, and also provides a baking and cooking device including the hot air unit. Specifically, the baking and cooking device can be a microwave oven, a steam oven, etc. The hot air unit further includes a drive unit connected to the fan and a heating element disposed on the outer periphery of the fan. The heating element can be a heat pipe arranged around the fan circumferentially. During fan rotation, the air is pushed to form an airflow. After being thrown out of the fan, the airflow flows through the heating element, is heated, and forms a hot airflow. In addition to the hot air unit, the baking and cooking device also includes an inner cavity assembly with an inner chamber and a door panel for closing the inner cavity. The inner cavity is used to contain food and the hot airflow. The door panel is spaced apart from the hot air unit, and the inner cavity is located between the hot air unit and the door panel. The hot airflow enters the inner cavity and flows towards the door panel to heat the food. Subsequently, the hot airflow turns around and forms a return airflow approaching the hot air unit. As the fan continues to rotate, the return airflow is disturbed by the fan and becomes hot airflow again, thereby realizing the circulation of hot airflow between the hot air unit and the inner cavity, thus continuously heating the food until it is cooked.

[0039] See Figures 1-2The fan of the present invention includes a main body 10 and at least one bidirectional turbulence section 20. The main body 10 is generally sheet-like and has an axial line passing through the center of the main body 10 in an extension direction perpendicular to the main body 10. The axial line serves as the rotation center when the fan rotates. The drive member includes an output shaft connected to the main body 10. The axis of the output shaft coincides with the axial line. The drive member can control the output shaft to rotate alternately in both directions, thereby driving the fan to rotate alternately in both directions around the axial line. If the fan is viewed from the side away from the drive member in a line of sight parallel to the axial line, as shown... Figure 2 When the drive unit drives the fan to rotate in the forward direction, Figure 2 The fan shown rotates clockwise; when the drive unit causes the fan to rotate in the opposite direction... Figure 2 The fan shown rotates counterclockwise. Alternating clockwise and counterclockwise rotation means that the fan alternates between clockwise and counterclockwise rotation at a certain frequency.

[0040] The bidirectional airflow deflector 20 is connected to the main body 10. When there are multiple bidirectional airflow deflectors 20, they are arranged circumferentially around the axial line of the main body 10 and spaced apart from each other. Each bidirectional airflow deflector 20 includes a first blade 21 and a second blade 22, both of which protrude from the main body 10 along the length of the axial line. When the fan rotates forward, one of the first blade 21 and the second blade 22 acts as the main blade propelling the air to accelerate the airflow; when the fan rotates in reverse, the other of the first blade 21 and the second blade 22 acts as the main blade propelling the air to accelerate the airflow. The first blade 21 and the second blade 22 are staggered sequentially along the circumference of the main body 10. If a central projection is made onto the first blade 21 and the second blade 22 of any bidirectional airflow deflector 20 with the axial line as the projection center, and a cylindrical surface whose axis coincides with the axial line is used as the projection surface, then the shapes of the first blade 21 and the second blade 22 on the projection surface do not overlap.

[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 hot air units used in baking and cooking equipment, the fan mounted on the hot air unit is a centrifugal fan, and the number of turbulence-disrupting parts of a centrifugal fan is usually 5 to 10. Therefore, for the fan of the present invention, the number of bidirectional turbulence-disrupting parts 20 can also be configured to be 5 to 10, and is not limited to 5 to 10.

[0042] Each bidirectional spoiler 20 has a first blade 21 and a second blade 22 that are radially deflected relative to the main body 10 with different rotation directions, and the spacing between the first blade 21 and the second blade 22 varies 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, and 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 closer to the axial line, and the first distal end is the other end of the first blade 21 away from the axial line. The second proximal end is the end of the second blade 22 closer to the axial line, and the second distal end is the other end of the second blade 22 away from the axial line. The lines connecting the first proximal end to the axial line and the lines connecting the first distal end to the axial line are staggered along the circumference of the main body 10, and the lines connecting the second proximal end to the axial line and the lines connecting the second distal end to the axial line are also staggered along the circumference of the main body 10.

[0043] See Figures 2-3 In some embodiments, for each bidirectional spoiler 20, the side of the first blade 21 that is relatively far from the second blade 22 is the third spoiler side 212, and the side of the second blade 22 that is relatively far from the first blade 21 is the fourth spoiler side 222. When the fan rotates in the forward direction, the fourth spoiler side 222 serves as the windward surface of the second blade 22 and is used to push air to generate airflow. When the fan rotates in the reverse direction, the third spoiler side 212 serves as the windward surface of the first blade 21 and is used to push air to generate airflow. The spacing between the third spoiler side 212 and the fourth spoiler side 222 decreases in a direction away from the axial line along the radial direction of the main body 10. The included angle formed between the third spoiler side 212 and the fourth spoiler side 222 has an opening that opens toward the axial line and has a vertex that faces away from the axial line.

[0044] See Figures 2-3 For any one of the bidirectional airflow deflectors 20, if the fan is viewed from the side away from the drive member with a line of sight parallel to the axial line, the line connecting the first proximal end to the axial line is located on the counterclockwise side of the line connecting the first distal end to the axial line, and the line connecting the second proximal end to the axial line is located on the clockwise side of the line connecting the second distal end to the axial line. The first fan blade 21 is oscillating clockwise relative to the line connecting the first proximal end to the axial line around the first proximal end, and the second fan blade 22 is oscillating counterclockwise relative to the line connecting the second proximal end to the axial line around the second proximal end.

[0045] like Figure 3As shown, when the fan rotates clockwise under the drive of the drive unit, the fourth turbulence side 222 serves as the main surface for pushing air. The pushing speed of the air by the fourth turbulence side 222 is represented by arrow V1. This pushing speed can be decomposed into a tangential velocity along the tangential orientation of the bidirectional turbulence section 20 and a radial velocity along the radial direction of the main body 10, away from the axial line. The tangential velocity and radial velocity are represented by arrows V3 and V2, respectively. The radial velocity V2 causes the air to accelerate outward along the radial direction of the main body 10. When the airflow is thrown out of the fan, the initial velocity of the airflow ensures that it is heated and forms a hot airflow with greater kinetic energy, thus allowing the hot airflow to heat the food more thoroughly. When the fan rotates counterclockwise under the drive of the drive unit, the third turbulence side 212 serves as the main surface for pushing air. At this time, the pushing speed of the air by the third turbulence side 212 can also be decomposed into the tangential velocity along the tangential orientation of the bidirectional turbulence section 20 and the radial velocity along the radial direction of the main body section 10 and away from the axial line. Therefore, when the fan rotates counterclockwise, the initial velocity obtained when the airflow is thrown out of the fan is still sufficient to maintain the generation of hot airflow with greater kinetic energy.

[0046] Furthermore, a venting cavity 25 is provided and formed between every two adjacent bidirectional turbulence sections 20. Specifically, the venting cavity 25 between any two adjacent bidirectional turbulence sections 20 is located between the third turbulence side 212 of the first blade 21 of one bidirectional turbulence section 20 and the fourth turbulence side 222 of the second blade 22 of the other bidirectional turbulence section 20. The multiple bidirectional turbulence sections 20 are arranged around the axial line along the circumference of the main body 10 at their ends relatively close to the axial line, and surround the intermediate air intake area 27. Each venting cavity 25 is connected to the intermediate air intake area 27 formed by the multiple bidirectional turbulence sections 20. The width of each venting cavity 25 increases in a direction away from the axial line. When the hot airflow turns around in the inner cavity and forms a return airflow flowing towards the hot air unit, the return airflow first enters the intermediate air intake area 27, and then enters the venting cavity 25 under centrifugal force, thereby reaching the windward side of the first blade 21 and the second blade 22.

[0047] See Figures 1-2 The bidirectional turbulence section 20 includes a first proximal end of the first blade 21 and a second proximal end of the second blade 22 at one end relative to the axial line. Along the circumference of the fan, multiple first proximal ends and multiple second proximal ends are arranged alternately around the axial line to form an intermediate air intake area 27. Adjacent first proximal ends and second proximal ends belong to two bidirectional turbulence sections 20 respectively. Adjacent first proximal ends and second proximal ends are spaced apart from each other so that the intermediate air intake area 27 connects to each air vent 25.

[0048] With this configuration, when the fan rotates in the forward direction, the return airflow from the inner cavity to the hot air unit first enters the intermediate air intake zone 27, then enters each air vent 25, and then the airflow entering each air vent 25 reaches the bidirectional turbulence section 20 on one side of the air vent 25. The second blade 22 of the bidirectional turbulence section 20 accelerates the airflow through the fourth turbulence side 222 so that the airflow is thrown out of the fan. When the fan rotates in the reverse direction, the return airflow from the inner cavity to the hot air unit first enters the intermediate air intake zone 27, then enters each air vent 25, and then the airflow entering each air vent 25 reaches the bidirectional turbulence section 20 on one side of the air vent 25. The first blade 21 of the bidirectional turbulence section 20 accelerates the airflow through the third turbulence side 212 so that the airflow is thrown out of the fan.

[0049] Furthermore, each vent chamber 25 has a vent opening located between two bidirectional flow deflectors 20 on either side of the vent chamber 25, and the vent opening is radially open along the main body 10. If the fan is viewed from the side away from the drive member with a line of sight parallel to the axial line, the vent opening is an arc, one end of which is the first distal end of the first blade 21 of one of the bidirectional flow deflectors 20, and the other end of which is the second distal end of the second blade 22 of the other bidirectional flow deflector 20. The vent opening allows air propelled by the third flow deflector side 212 and the fourth flow deflector side 222 to exit the vent chamber 25. When the airflow entering the vent chamber 25 exits the vent chamber 25 through the vent opening under the propellant of the third flow deflector side 212 or the fourth flow deflector side 222, the airflow is thrown out of the fan.

[0050] Furthermore, for any two adjacent bidirectional turbulence sections 20, the first blade 21 of one and the second blade 22 of the other are symmetrical about a preset radial base plane, which is a plane including the axial line, and the preset radial base plane divides the air venting cavity 25 between the first blade 21 and the second blade 22 into two equal parts. With this configuration, when the fan's forward rotation speed is equal to its reverse rotation speed, the propulsion velocity vector of the air pushed by the fourth turbulence side 222 of the second fan blade 22 on one side of the preset radial base surface and the propulsion velocity vector of the air pushed by the third turbulence side 212 of the first fan blade 21 on the other side of the preset radial base surface are symmetrical about the preset radial base surface. Therefore, the radial velocity vector generated by the air pushed by the fourth turbulence side 222 and the radial velocity vector generated by the air pushed by the third turbulence side 212 are basically equal. In addition, the tangential velocity vector generated by the air pushed by the fourth turbulence side 222 and the tangential velocity vector generated by the air pushed by the third turbulence side 212 are basically equal in magnitude and opposite in direction. Therefore, whether the fan rotates forward or backward, the wind force and air volume of the hot airflow provided by the fan are basically equal, which is beneficial for evenly baking the food so that all parts of the food are evenly cooked.

[0051] In some embodiments, the bidirectional turbulence section 20 further includes a third blade 23 extending radially along the main body 10. The first blade 21 and the second blade 22 are both disposed at the end of the third blade 23 that is relatively close to the axial line. Therefore, based on the first blade 21 and the second blade 22, the third blade 23 can also push air and accelerate it to form an airflow. If the fan is viewed from the side away from the drive member with a line of sight parallel to the axial line, the vent opening is an arc. One end of this arc is the distal end of the third blade 23 of one of the bidirectional turbulence sections 20, and the other end is the distal end of the third blade 23 of the other bidirectional turbulence section 20. The distal end of the third blade 23 is the end of the third blade 23 that is relatively far from the axial line. The first blade 21, the second blade 22, and the third blade 23 form a Y-shaped pattern. The third turbulence side 212 and the fourth turbulence side 222 are symmetrical about a preset radial base plane, which is a plane including the axial line. The third blade 23 is parallel to this preset radial base plane. When the fan rotates in the forward direction, one side of the third blade 23 and the fourth turbulence side 222 together act as the windward surface to push the air. When the fan rotates in the reverse direction, the other side of the third blade 23 and the third turbulence side 212 together act as the windward surface to push the air.

[0052] With this configuration, when the fan's forward rotation speed is equal to its reverse rotation speed, the propulsion velocity vectors of the air pushed by the fourth turbulence side 222 and the third turbulence side 212 are symmetrical about the preset radial base plane. Therefore, the radial velocity vectors generated by the air pushed by the fourth turbulence side 222 and the third turbulence side 212 are basically equal. In addition, the tangential velocity vectors generated by the air pushed by the fourth turbulence side 222 and the third turbulence side 212 are basically equal in magnitude and opposite in direction. So, whether the fan rotates forward or backward, the wind force and air volume of the hot airflow provided by the fan are basically equal, which is beneficial for evenly baking the food so that all parts of the food are cooked evenly.

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

[0054] Optionally, see Figure 3If we denote the line connecting the first distal end of the first blade 21 to the axial line as the third line, and the line connecting the second distal end of the second blade 22 to the axial line as the fourth line, then the angle between the first blade 21 and the third line is denoted by ∠1. ∠1 is the angle of deflection of the first blade 21 around its first distal end relative to the third line in a clockwise direction, with a maximum value of 30°. The angle between the second blade 22 and the fourth line is denoted by ∠2. ∠2 is the angle of deflection of the second blade 22 around its second distal end relative to the fourth line in a counterclockwise direction, with a maximum value of 30°. The maximum value of the deflection angle of the first blade 21 around its first distal end relative to the third line in a clockwise direction is 150°, and the maximum value of the deflection angle of the second blade 22 around its second distal end relative to the fourth line in a counterclockwise direction is also 150°. As a preferred embodiment, ∠1 = ∠2, that is, the sway angle of the first blade 21 relative to the third line in a clockwise direction around the first far end is equal to the sway angle of the second blade 22 relative to the fourth line in a counterclockwise direction around the second far end.

[0055] It is understandable that the larger ∠1 and ∠2 are, the greater the radial velocity vector generated by the fourth turbulence side 222 and the third turbulence side 212 pushing the air. However, excessively large ∠1 and ∠2 can easily obstruct the airflow when it is thrown outward from the fan. This is because if ∠1 and ∠2 are too large, for any two adjacent bidirectional turbulence sections 20, the first proximal end of the first blade 21 of one bidirectional turbulence section 20 and the second proximal end of the second blade 22 of the other bidirectional turbulence section 20 will be too close. This means that the minimum width of the venting cavity 25 between the two bidirectional turbulence sections 20 is smaller. Therefore, the return airflow entering the middle air intake area 27 will have difficulty entering the venting cavity 25, resulting in a decrease in the amount of air entering the venting cavity 25, ultimately weakening the fan's airflow. The aforementioned angular constraints on ∠1 and ∠2 ensure that the hot airflow obtains a large radial velocity vector while also taking into account the airflow of the hot airflow.

[0056] In other embodiments, the setting of ∠1≠∠2 can also be adopted, that is, the sway angle of the first blade 21 relative to the third line in a clockwise direction around the first far end is not equal to the sway angle of the second blade 22 relative to the fourth line in a counterclockwise direction around the second far end.

[0057] Further, see Figures 1-3In some embodiments, the second distal end is disconnected from the end of the third blade 23 that is closer to the axial line, forming a fourth disconnection gap 26 between them; the first distal end is disconnected from the end of the third blade 23 that is closer to the axial line, forming a fifth disconnection gap 26 between them; and the first distal end is disconnected from the second distal end, forming a sixth disconnection gap 26 between them. With this configuration, when the fan rotates in the forward direction, the fourth disconnect gap 26 allows airflow to pass through and flow towards the leeward side of the third blade 23. At this time, the pressure on the windward side of the third blade 23 is greater than the pressure on the leeward side of the third blade 23. The pressure difference causes the airflow attached to the fourth turbulence side 222 to move closer to the third blade 23 more quickly, thereby accelerating the airflow out of the fan. At the same time, the sixth disconnect gap 26 allows the air between the first blade 21 and the second blade 22 to pass through and be thrown out of the fan together. When the fan rotates in the reverse direction, the fifth disconnect gap 26 allows airflow to pass through and flow towards the leeward side of the third blade 23. At this time, the pressure on the windward side of the third blade 23 is greater than the pressure on the leeward side of the third blade 23. The pressure difference causes the airflow attached to the third turbulence side 212 to move closer to the third blade 23 more quickly, thereby accelerating the airflow out of the fan. At the same time, the sixth disconnect gap 26 allows the air between the first blade 21 and the second blade 22 to pass through and be thrown out of the fan together.

[0058] Furthermore, 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. The radial length L of the bidirectional spoiler 20 is measured as follows: along the radial orientation of the main body 10, the distance from the end of the third blade 23 relatively far from the axial line to the end of the first and second proximal ends that is farther from the axial line is denoted as L. In particular, the fourth, fifth, and sixth disconnection gaps 26 do not exceed 3 mm.

[0059] Figures 1-3The fan shown is suitable for use in alternating forward and reverse rotation conditions. When the fan rotates forward, the second blade 22 of each bidirectional turbulence section 20 pushes air through the fourth turbulence side 222 and throws the airflow out of the fan along the radial direction of the main body 10 and the tangential direction of the bidirectional turbulence section 20. When the fan rotates in reverse, the first blade 21 of each bidirectional turbulence section 20 pushes air through the third turbulence side 212 and throws the airflow out of the fan along the radial direction of the main body 10 and the tangential direction of the bidirectional turbulence section 20. Both the first blade 21 and the second blade 22 are radially offset relative to the main body 10, and The two blades have different yaw directions relative to the main body 10. Regardless of whether the fan rotates forward or backward, the first blade 21 and the second blade 22 can give the airflow thrown out of the fan a greater velocity vector along the radial direction of the main body 10, thereby increasing the wind speed of the hot airflow. In contrast, the blades of existing fans all extend radially along the fan, while the first blade 21 and the second blade 22 of the fan of the present invention are longer and have a larger area of ​​the air-propelling front surface, thus driving more air to accelerate the air and form a hot airflow, thereby increasing the air volume of the hot airflow.

[0060] It should be noted that the windward side and the leeward side of the third blade 23 are not fixed. When the rotation direction of the fan changes, the windward side of the third blade 23 will be used as the leeward side of the third blade 23, and the leeward side of the third blade 23 will be used as the windward side of the third blade 23.

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

[0062] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any appropriate changes and variations made to the above embodiments within the essential spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A fan, characterized in that, The fan includes a main body (10) and a plurality of bidirectional airflow deflectors (20). The main body (10) has an axial line as the rotation center of the fan. The plurality of bidirectional airflow deflectors (20) are arranged around the axial line and form an intermediate air intake area (27). Each bidirectional airflow deflector (20) includes a first blade (21) and a second blade (22). The first blade (21) and the second blade (22) are staggered along the circumference of the main body (10). They are respectively radially deflected relative to the main body (10) with different rotation directions, and the spacing between them decreases in the direction away from the axial line. For each of the bidirectional turbulence sections (20), the side of the first fan blade (21) that is relatively far away from the second fan blade (22) is the third turbulence side (212), and the side of the second fan blade (22) that is relatively far away from the first fan blade (21) is the fourth turbulence side (222). In any two adjacent bidirectional turbulence sections (20), a venting cavity (25) is formed between the third turbulence side (212) of the first blade (21) of one and the fourth turbulence side (222) of the second blade (22) of the other, and the venting cavity (25) is connected to the intermediate air intake area (27).

2. The fan as described in claim 1, characterized in that, The spacing between the third spoiler side (212) and the fourth spoiler side (222) decreases in a direction away from the axial line.

3. The fan as described in claim 1, characterized in that, The width of the vent cavity (25) varies in an increasing trend along a direction away from the axial line; and / or, Each of the said vent chambers (25) has a vent opening that opens radially along the main body portion (10); and / or, In any two adjacent bidirectional turbulence sections (20), the first blade (21) of one and the second blade (22) of the other are symmetrical about a preset radial base plane, which bisects the air vent (25) and includes the axial line.

4. The fan as described in claim 1, characterized in that, The line connecting the end of the first fan blade (21) that is relatively far from the axial line to the axial line is the third connecting line, and the maximum included angle between the first fan blade (21) and the third connecting line is 30°; and / or, The line connecting the end of the second blade (22) that is relatively far from the axial line to the axial line is the fourth line, and the minimum included angle between the second blade (22) and the fourth line is 30°.

5. The fan as described in claim 4, characterized in that, The line connecting the end of the first fan blade (21) that is relatively far from the axial line to the axial line is the third line, and the line connecting the end of the second fan blade (22) that is relatively far from the axial line to the axial line is the fourth line. The angle between the first fan blade (21) and the third line is ∠1, and the angle between the second fan blade (22) and the fourth line is ∠2, where ∠1 = ∠2.

6. The fan as described in claim 1, characterized in that, The bidirectional turbulence section (20) further includes a third fan blade (23) extending radially along the main body section (10), wherein the first fan blade (21) and the second fan blade (22) are disposed at one end of the third fan blade (23) that is relatively close to the axial line.

7. The fan as described in claim 6, characterized in that, The end of the first fan blade (21) away from the axial line is disconnected from the third fan blade (23); and / or, the end of the second fan blade (22) away from the axial line is disconnected from the third fan blade (23); and / or, the end of the first fan blade (21) away from the axial line is disconnected from the end of the second fan blade (22) away from the axial line.

8. The fan as described in claim 6, characterized in that, The radial length of the bidirectional turbulence section (20) is L, and the radial length of the third fan blade (23) is L1, where 0 ≤ L1 ≤ 0.7L.

9. A hot air unit, characterized in that, The device includes a drive unit and a fan as described in any one of claims 1 to 8, wherein the drive unit includes an output shaft connected to the main body (10), the output shaft being coaxial with the axial line, and the drive unit is capable of controlling the output shaft to rotate alternately in both directions.

10. A baking and cooking apparatus, characterized in that, Includes the hot air unit as described in claim 9.

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