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, bi-directional turbulent flow part includes first fan blade and second fan blade, along the circumferential orientation of main part, first fan blade and second fan blade staggered arrangement, the two parts are arranged in a radial deflection mode relative to the main body part in different rotation directions, and the interval width of the two parts changes in a gradually increasing or decreasing trend in the direction 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 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 its rotation direction at a certain conversion frequency during the rotation process.

[0004] However, at present, the performance of 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 of 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. Along the circumferential direction of the main body part, the first fan blade and the second fan blade are arranged in a staggered manner, and the two are respectively arranged to swing relative to the radial direction of the main body part in different rotation directions, and the interval width between the two changes in an increasing or decreasing trend 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 with yaw. When the first blade pushes air, it can provide a radial acceleration for the airflow in contact with 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 air, it can provide a radial acceleration for the airflow in contact with 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 fan, the first blade and the second blade carried by the fan of the present utility model are larger in size. When the fan rotates and pushes 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 close to the second blade is the first turbulent flow side, and the side of the second blade relatively close to the first blade is the second turbulent flow side. The interval width between the first turbulent flow side and the second turbulent flow side changes in an increasing trend along the direction away from the axial line.

[0012] With such a setting, when the fan rotates forward, the first turbulent flow side serves as the windward side of the first blade, and the velocity of the air in contact with the first turbulent flow side can be decomposed into two components, namely the tangential component along the tangent of the first blade and the 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 second turbulent flow side serves as the windward side of the second blade, and the velocity of the air in contact with the second turbulent flow side can be decomposed into two components, namely the tangential component along the tangent of the second blade and the radial component along the radial direction of the main body pointing away from the axial line.

[0013] In some embodiments, the two-way turbulent flow part further constructs a accommodation cavity located between the first turbulent flow side and the second turbulent flow side. The accommodation cavity penetrates the two-way turbulent flow part along the axial direction of the main body to form a first opening, and the accommodation cavity penetrates the two-way turbulent flow part along the radial direction of the main body to form a second opening.

[0014] With such a setting, the return airflow flowing back from the inner liner cavity of the baking cooking device to the hot air unit can enter the accommodation cavity from the first opening, and then be thrown out of the accommodation cavity from the second opening under the disturbance and acceleration of the first blade or the second blade, so as to form a hot air flow thrown out of the fan.

[0015] In some embodiments, the first turbulent flow side and the second turbulent flow side are symmetric about a preset radial base plane. The preset radial base plane includes the axial line, and the accommodation cavity is bisected by the preset radial base plane.

[0016] With such a setting, when the fan rotates forward and backward at the same rate, the velocity vectors of the air contacting the first spoiler side and the velocity vectors of the air contacting the second spoiler side are symmetric with respect to a preset radial plane. Therefore, regardless of whether the fan rotates forward or backward, the hot air has substantially the same radial velocity vector component, that is, the magnitudes of the initial velocities of the hot air flow ejected from the fan are substantially equal. Thus, it can ensure that the ingredients are evenly baked when the fan rotates forward and backward alternately.

[0017] In some embodiments, the two-way spoiler portion further includes a third fan blade extending radially along the main body portion, and the first fan blade and the second fan blade are provided at one end of the third fan blade relatively far from the axial line.

[0018] With such a setting, when the fan rotates forward, the air disturbed by the two-way spoiler portion first contacts the third fan blade, and the air gradually obtains a velocity vector flowing radially outward along the main body portion, then contacts the first fan blade, and subsequently the air accelerates under the disturbance and acceleration of the first spoiler side. When the fan rotates backward, the air disturbed by the two-way spoiler portion first contacts the third fan blade, and the air gradually obtains a velocity vector flowing radially outward along the main body portion, then contacts the second fan blade, and subsequently the air accelerates under the disturbance and acceleration of the second spoiler side. The acceleration process of the radial velocity of the air is smoother and more linear, which is beneficial to reducing the load of the fan and the stress and strain of the first fan blade and the second fan blade.

[0019] In some embodiments, one end of the first fan blade close to the axial line is disconnected from the third fan blade; and / or, one end of the second fan blade close to the axial line is disconnected from the third fan blade; and / or, one end of the first fan blade close to the axial line is disconnected from one end of the second fan blade close to the axial line.

[0020] With such a setting, when the fan rotates forward, the disconnection gap formed between the first fan blade and the third fan blade allows the air flow to pass through and flow to the side of the first fan blade away from the second fan blade. Therefore, a pressure difference is formed in the area near the disconnection 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 flowing along the third fan blade to approach the first fan blade more quickly, thereby accelerating the radial outward flow of the air flow along the main body; when the fan rotates in the reverse direction, the disconnection gap formed between the second fan blade and the third fan blade allows the air flow to pass through and flow to the side of the second fan blade away from the first fan blade. Therefore, a pressure difference is formed in the area near the disconnection 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 flowing along the third fan blade to approach the second fan blade more quickly, thereby accelerating the radial outward flow of the air flow along the main body and prompting the air flow to have a greater initial velocity when it is thrown out of the fan; when the fan rotates forward, the disconnection gap formed between the first fan blade and the second fan blade allows the air flow flowing along the third fan blade to pass through this disconnection gap to reach the first turbulent flow side, and when the fan rotates in the reverse direction, the disconnection gap formed between the first fan blade and the second fan blade allows the air flow flowing along the third fan blade to pass through this disconnection gap to reach the second turbulent flow side.

[0021] In some embodiments, the connection line between the end of the first fan blade relatively close to the axial line and the axial line is the first connection line, and the minimum included angle between the first fan blade and the first connection line is 135°; and / or,

[0022] The connection line between the end of the second fan blade relatively close to the axial line and the axial line is the second connection line, and the minimum included angle between the second fan blade and the second connection line is 135°.

[0023] With such a setting, it can not only ensure the disturbance and acceleration of the air flow by the first fan blade when the fan rotates forward, but also prevent the yaw angle of the first fan blade from being too large, so as to prevent the first fan blade from causing escape interference to the air flow flowing along the third fan blade when the fan rotates in the reverse direction; and, it can not only ensure the disturbance and acceleration of the air flow by the second fan blade when the fan rotates in the reverse direction, but also prevent the yaw angle of the second fan blade from being too large, so as to prevent the second fan blade from causing escape interference to the air flow flowing along the third fan blade when the fan rotates forward.

[0024] In some embodiments, the side of the first fan blade relatively far from the second fan blade is the third turbulent flow side, the side of the second fan blade relatively far from the first fan blade is the fourth turbulent flow side, and the interval width between the third turbulent flow side and the fourth turbulent flow side changes in a decreasing trend along the direction away from the axial line.

[0025] With such a setting, when the fan rotates forward, the fourth spoiler side serves as the windward side of the second blade, and the velocity of the air in contact with the fourth spoiler side can be decomposed into two components, namely, a tangential component along the tangent of the second blade and a radial component along the radial direction of the main body portion and pointing away from the axial line. When the fan rotates backward, the third spoiler side serves as the windward side of the first blade, and the velocity of the air in contact with the third spoiler side can be decomposed into two components, namely, a tangential component along the tangent of the first blade and a radial component along the radial direction of the main body portion and pointing away from the axial line.

[0026] In some embodiments, a plurality of bidirectional spoiler portions are configured, and the plurality of bidirectional spoiler portions are arranged around the axial line along the circumferential direction of the main body portion, and an intermediate air inlet region is formed therearound. In any two adjacent bidirectional spoiler portions, an air leakage cavity communicating with the intermediate air inlet region is formed between the first blade of one of them and the second blade of the other, and the width of the air leakage cavity changes in an increasing trend along the direction away from the axial line.

[0027] With such a setting, when the fan rotates forward, the return air flow flowing back from the inner liner cavity of the baking cooking device to the hot air unit can enter the air leakage cavity between any two adjacent bidirectional spoiler portions from the intermediate air inlet region, and then the air flow entering the air leakage cavity is disturbed by the fourth spoiler side of the second blade and the air flow is accelerated. When the fan rotates backward, the return air flow flowing back from the inner liner cavity of the baking cooking device to the hot air unit can enter the air leakage cavity between any two adjacent bidirectional spoiler portions from the intermediate air inlet region, and then the air flow entering the air leakage cavity is disturbed by the third spoiler side of the first blade and the air flow is accelerated. Along the direction away from the axial line, the width of the air leakage cavity gradually widens to facilitate the air flow accelerated by the first blade or the second blade in the air leakage cavity to be thrown out.

[0028] In some embodiments, in any two adjacent bidirectional spoiler portions, the first blade of one of them and the second blade of the other are symmetric about a preset radial reference plane, and the preset radial reference plane bisects the air leakage cavity and includes the axial line.

[0029] With such a setting, when the fan rotates forward and backward at the same rate, the velocity vector of the air in contact with the fourth spoiler side and the velocity vector of the air in contact with the third spoiler side are symmetric about the preset radial reference plane. Therefore, regardless of whether the fan rotates forward or backward, 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, so that it can ensure uniform baking of food ingredients when the fan rotates forward and backward alternately.

[0030] In some embodiments, the connection line between the end of the first blade relatively far from the axial line and the axial line is the third connection line, and the maximum included angle between the first blade and the third connection line is 30°; and / or,

[0031] The line connecting the end of the second fan blade relatively far from the axial line to the axial line is the fourth connection line, and the minimum angle between the second fan blade and the fourth connection line is 30°.

[0032] With such a setting, it can not only ensure the acceleration of the airflow disturbance by the first and second fan blades when the fan rotates, so as to endow the airflow velocity with more velocity vectors along the radial direction of the main body, but also prevent the yaw angles of the first and second fan blades from being too large, thereby reducing the obstructive effect of the first and second fan blades on the air entering the air release cavity and avoiding insufficient air volume entering the air release cavity and weakening the air volume.

[0033] In some embodiments, the line connecting the end of the first fan blade relatively far from the axial line to the axial line is the third connection line, the line connecting the end of the second fan blade relatively far from the axial line to the axial line is the fourth connection line, the angle between the first fan blade and the third connection line is ∠1, the angle between the second fan blade and the fourth connection line is ∠2, and ∠1 = ∠2.

[0034] 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.

[0035] 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 and second fan blades are arranged at the end of the third fan blade relatively close to the axial line.

[0036] 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.

[0037] 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.

[0038] With such a setting, when the fan rotates forward, the disconnection 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 disconnection 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 spoiler side to approach the windward side of the third fan blade more quickly, thereby accelerating the radial outward flow of the air flow along the main body; when the fan rotates in the reverse direction, the disconnection 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 disconnection 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 spoiler side to approach the windward side of the third fan blade more quickly, thereby accelerating the radial outward flow of the air flow along the main body; when the fan rotates forward, the disconnection 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 disconnection gap to be ejected from the fan. When the fan rotates in the reverse direction, the disconnection 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 disconnection gap to be ejected from the fan. Therefore, the air volume of the fan can be increased.

[0039] In some embodiments, the radial length of the bidirectional spoiler is L, and the radial length of the third fan blade is L 1 , 0 ≤ L 1 ≤ 0.7L.

[0040] With such a setting, it is ensured that the first fan blade and the second fan blade have sufficient length dimensions, so that the air flow can obtain sufficient velocity vectors radially outward along the main body after contacting the first fan blade or the second fan blade, thereby better achieving the purpose of increasing the air volume and air speed of the hot air flow.

[0041] 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 portion. The output shaft is coaxial with the axial line, and the driving member can control the output shaft to rotate forward and backward alternately.

[0042] The baking and cooking device provided by the present utility model includes a hot air unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a three-dimensional schematic diagram of a fan according to an embodiment of the present utility model;

[0044] Figure 2 is Figure 1 the front view of the fan shown;

[0045] Figure 3 is Figure 2 a partially enlarged schematic diagram of the fan shown at A;

[0046] Figure 4A three-dimensional schematic diagram of a fan according to an embodiment of the present invention;

[0047] Figure 5 is Figure 4 a front view of the fan shown in the figure;

[0048] Figure 6 is Figure 5 a partially enlarged schematic view of the fan shown in the figure at B.

[0049] Reference numerals: 10, main body part; 20, two-way flow disturbing part; 21, first fan blade; 211, first flow disturbing side; 212, third flow disturbing side; 22, second fan blade; 221, second flow disturbing side; 222, fourth flow disturbing side; 23, third fan blade; 24, accommodating cavity; 25, air discharge cavity; 26, disconnection gap; 27, middle air inlet area. Specific embodiments

[0050] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described 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 of 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.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the description of the present invention herein 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.

[0052] The utility model provides a fan and a hot air unit including the fan, and also provides a baking cooking device including the hot air unit. The baking cooking device can be a microwave oven, a steam oven, etc. The hot air unit also includes a driving member connected to the fan and a heating element arranged on the outer peripheral side of the fan. The heating element can be a heat pipe arranged around the fan along the circumference of the fan. During the rotation of the fan, the air is pushed to form an airflow. After the airflow is thrown out of the fan, it flows through the heating element and forms a hot air flow after being heated. In addition to the hot air unit, the baking cooking device also includes an inner tank assembly with an inner tank cavity and a door plate for closing the inner tank cavity. The inner tank cavity is used to accommodate food and hot air flow. The door plate is spaced from the hot air unit. The inner tank cavity is located between the hot air unit and the door plate. The hot air flow enters the inner tank cavity and flows toward the door plate to heat the food. Then, the hot air flow 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 a hot air flow again, thereby realizing the circulation of the hot air flow between the hot air unit and the inner tank cavity, and then continuously heating the food until the food is cooked.

[0053] See also Figures 1 - 2 , Figures 4 - 5 The 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 and Figure 5 , when the driving part drives the fan to rotate in the forward direction, Figure 2 and Figure 5 The fan shown rotates clockwise. When the drive element drives the fan to rotate in the reverse direction, Figure 2 and Figure 5 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.

[0054] The two-way spoiler part 20 is connected to the main body part 10. When the number of the two-way spoiler parts 20 is multiple, the multiple two-way spoiler parts 20 are arranged at intervals along the circumferential direction of the main body part 10. Each two-way spoiler part 20 includes a first fan blade 21 and a second fan blade 22, and both the first fan blade 21 and the second fan blade 22 protrude from the main body part 10 along the length direction of the axial line. When the fan rotates forward, one of the first fan blade 21 and the second fan blade 22 serves as the main fan blade for pushing air to accelerate the air flow. When the fan rotates in reverse, the other of the first fan blade 21 and the second fan blade 22 serves as the main fan blade for pushing air to accelerate the air flow. The first fan blade 21 and the second fan blade 22 are arranged in a staggered manner in sequence along the circumferential direction of the main body part 10. If a central projection is made on the first fan blade 21 and the second fan blade 22 of any one two-way spoiler part 20 with the axial line as the projection center, and a cylindrical surface with the axis coinciding with the axial line is used as the projection surface, then the patterns of the first fan blade 21 and the second fan blade 22 on the projection surface do not overlap with each other.

[0055] It should be noted that the circumferential direction of the main body part 10 refers to the circumferential direction around the axial line, and it is also the circumferential direction of the fan; the radial direction of the main body part 10 refers to the direction perpendicular to the axial line, and it is also the radial direction of the fan. For the hot air unit applied in the baking cooking equipment, the fan carried by the hot air unit is a centrifugal fan. The number of the spoiler parts of the centrifugal fan is usually 5 to 10. Therefore, for the fan of the present utility model, the number of the two-way spoiler parts 20 can also be configured as 5 to 10 and is not limited to 5 to 10.

[0056] The first fan blade 21 and the second fan blade 22 of each two-way spoiler part 20 are respectively arranged with a yaw relative to the radial direction of the main body part 10 in different rotation directions, and the interval width between the first fan blade 21 and the second fan blade 22 changes in an increasing or decreasing trend along the radial direction of the main body part 10 and away from the axial line. The first fan blade 21 includes a first proximal end and a first distal end, the second fan blade 22 includes a second proximal end and a second distal end. The first proximal end is the end of the first fan blade 21 close to the axial line, the first distal end is the end of the first fan blade 21 far from the axial line, the second proximal end is the end of the second fan blade 22 close to the axial line, and the second distal end is the end of the second fan blade 22 far 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 in a staggered manner along the circumferential direction of the main body part 10. 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 in a staggered manner along the circumferential direction of the main body part 10.

[0057] Embodiment 1

[0058] In some embodiments, for each two-way spoiler 20, the side of the first blade 21 relatively closer to the second blade 22 is the first spoiler side 211, and the side of the second blade 22 relatively closer to the first blade 21 is the second spoiler side 221. When the fan rotates forward, the first spoiler side 211 serves as the windward surface of the first blade 21 to push air to generate an air current. When the fan rotates in the reverse direction, the second spoiler side 221 serves as the windward surface of the second blade 22 to push air to generate an air current. The spacing width between the first spoiler side 211 and the second spoiler side 221 changes in an increasing trend along the radial direction of the main body 10 in the orientation away from the axial line. The angle formed between the first spoiler side 211 and the second spoiler side 221 has a vertex pointing to the axial line and an opening facing outward.

[0059] Refer to Figures 2 - 3 , for any one two-way spoiler 20, if the fan is observed from the side of the fan away from the driving member in the line-of-sight direction parallel to the axial line, the connection line from the first distal end to the axial line is located on the counterclockwise side of the connection line from the first proximal end to the axial line, and the connection line from the second distal end to the axial line is located on the clockwise side of the connection line from the second proximal end to the axial line. The first blade 21 is arranged to yaw relative to the connection line from the first proximal end to the axial line in the counterclockwise direction around the first proximal end, and the second blade 22 is arranged to yaw relative to the connection line from the second proximal end to the axial line in the clockwise direction around the second proximal end.

[0060] As Figure 3 shown, when the fan rotates clockwise forward driven by the driving member, the first spoiler side 211 serves as the main surface for pushing air. At this time, the pushing speed of the first spoiler side 211 for pushing air is represented by an arrow V1, and the pushing speed can be decomposed into a tangential speed along the tangential orientation of the two-way spoiler 20 and a radial speed along the radial direction of the main body 10 and away from the axial line. The tangential speed and the radial speed are represented by an arrow V3 and an arrow V2 respectively. The radial speed V2 causes the air to accelerate and flow out along the radial direction of the main body 10. When the air current is thrown out of the fan, the initial speed of the air current ensures that after the air current is heated and heated up, a hot air current with greater kinetic energy is formed, so that the hot air current can heat the food ingredients more fully. When the fan rotates counterclockwise in the reverse direction driven by the driving member, the second spoiler side 221 serves as the main surface for pushing air. At this time, the pushing speed of the second spoiler side 221 for pushing air can also be decomposed into a tangential speed along the tangential orientation of the two-way spoiler 20 and a radial speed along the radial direction of the main body 10 and away from the axial line. Therefore, when the fan rotates counterclockwise in the reverse direction and the air current is thrown out of the fan, the initial speed obtained is still sufficient to maintain the generation of a hot air current with greater kinetic energy.

[0061] Further, each two-way spoiler 20 has a receiving cavity 24 formed between a first spoiler side 211 and a second spoiler side 221. The receiving cavity 24 penetrates the two-way spoiler 20 along the axial direction of the main body 10 to form a first opening, and the receiving cavity 24 penetrates the two-way spoiler 20 along the radial direction of the main body 10 to form a second opening. 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 receiving cavity 24 through the first opening, and then leaves the receiving cavity 24 through the second opening under the push of the first spoiler side 211 or the second spoiler side 221. When the air flow leaves the receiving cavity 24, it is thrown out by the fan, and then the air flow will flow along the radial direction of the fan in an orientation away from the axial line and approach the heating element, and then the air flow is heated and raised in temperature to form a hot air flow. Refer to Figure 2 , if the fan is observed from the side of the fan facing away from the driving member in a line-of-sight direction parallel to the axial line, the first opening is facing the observer, and the second opening is an arc formed between a first distal end and a second distal end.

[0062] In some embodiments, the two-way spoiler 20 further includes a third fan blade 23 extending along the radial direction of the main body 10. The first fan blade 21 and the second fan blade 22 are both disposed at an end of the third fan blade 23 relatively far from 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 promote the air to accelerate to form an air flow. When the fan rotates forward, one side of the third fan blade 23 and the first spoiler side 211 both act as windward surfaces to push the air. When the fan rotates in the reverse direction, the other side of the third fan blade 23 and the second spoiler side 221 both act as windward surfaces to push the air. Refer to Figure 2 , if the fan is observed from the side of the fan facing away from the driving member in a line-of-sight direction parallel to 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 first spoiler side 211 and the second spoiler side 221 are symmetric about a preset radial base plane. The preset radial base plane includes the axial line and bisects the receiving cavity 24, and the third fan blade 23 is parallel to the preset radial base plane.

[0063] With such a setting, when the rotation speed of the fan in the forward rotation and the reverse rotation is equal, the pushing speed vectors of the first spoiler side 211 pushing the air and the second spoiler side 221 pushing the air are symmetric about the preset radial base plane. Therefore, the radial speed vectors generated by the first spoiler side 211 pushing the air and the second spoiler side 221 pushing the air are basically equal. In addition, the vector magnitudes of the tangential speed vectors generated by the first spoiler side 211 pushing the air and the second spoiler side 221 pushing the air are basically equal, and the vector directions are opposite. Therefore, whether the fan rotates forward or backward, the wind force and air volume of the provided hot air flow are basically equal, which is beneficial to evenly baking the food ingredients so that each part of the food ingredients is evenly cooked.

[0064] It can be understood that in 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 observed from the side of the fan away from the driving member in a line of sight parallel to the axial line, the first blade 21 and the second blade 22 form a V-shaped figure.

[0065] Optionally, see Figure 3 , if the line from the first proximal end of the first blade 21 to the axial line is recorded as the first line, and the line from the second proximal end of the second blade 22 to the axial line is recorded as the second line, then the minimum value of the angle α between the first blade 21 and the first line is 135°, the deflection angle of the first blade 21 around the first proximal end in a counterclockwise direction relative to the first line is complementary to ∠α, the minimum value of the angle β between the second blade 22 and the second line is 135°, and the deflection angle of the second blade 22 around the second proximal end in a clockwise direction relative to the second line is complementary to ∠β. In other words, the maximum value of the deflection angle of the first blade 21 around the first proximal end in a counterclockwise direction relative to the first line is 45°, and the maximum value of the deflection angle of the second blade 22 around the second proximal end in a clockwise direction relative to the second line is 45°. As a preferred solution, ∠α=∠β, that is, the swing angle of the first blade 21 around the first proximal end in the counterclockwise direction relative to the first connecting line = the swing angle of the second blade 22 around the second proximal end in the clockwise direction relative to the second connecting line.

[0066] It can be understood that when ∠α and ∠β are smaller, the value of the radial velocity vector generated by the first spoiler side 211 and the second spoiler side 221 pushing the air is larger, but when ∠α and ∠β are too small, it is easy to cause part of the airflow to be blocked when it is thrown out of the fan. The reason is that no matter whether the fan rotates forward or reverse, there is always a part of the air attached to the third blade 23 and flows radially outward along the main body 10. If ∠α and ∠β are too small, then this part of the airflow attached to the third blade 23 is easily blocked by the second blade 22 when the fan rotates forward. Similarly, this part of the airflow attached to the third blade 23 is also easily blocked by the first blade 21 when the fan rotates reversely, thereby affecting the escape of this part of the airflow. The above-mentioned angle limit on ∠α and ∠β not only ensures that the hot air flow obtains a larger radial velocity vector, but also takes into account the smooth escape of the airflow attached to the third blade 23.

[0067] In other embodiments, ∠α≠∠β may be set, that is, the swing angle of the first blade 21 around the first proximal end in the counterclockwise direction relative to the first connecting line ≠ the swing angle of the second blade 22 around the second proximal end in the clockwise direction relative to the second connecting line.

[0068] Further, see Figures 1 - 3, in some embodiments, the first proximal end is disconnected from the end of the third blade 23 relatively far from the axial line, and a first disconnection gap 26 is formed therebetween; the second proximal end is disconnected from the end of the third blade 23 relatively far from the axial line, and a second disconnection gap 26 is formed therebetween; the first proximal end is disconnected from the second proximal end, and a third disconnection gap 26 is formed therebetween. With such an arrangement, when the fan rotates forward, the first disconnection gap 26 allows the airflow to pass through and flow to the side of the first blade 21 away from the second blade 22. 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 enables the airflow flowing along the third blade 23 to approach the first blade 21 more quickly, thereby accelerating the airflow to be thrown out of the fan. At the same time, the third disconnection gap 26 allows the airflow flowing along the third blade 23 to pass through and reach the first turbulence side 211; when the fan rotates in the reverse direction, the second disconnection gap 26 allows the airflow to pass through and flow to the side of the second blade 22 away from the first blade 21. 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 enables the airflow flowing along the third blade 23 to approach the second blade 22 more quickly, thereby accelerating the airflow to be thrown out of the fan. At the same time, the third disconnection gap 26 allows the airflow flowing along the third blade 23 to pass through and reach the second turbulence side 221.

[0069] In the first embodiment, the radial length of the two-way turbulence portion 20 is L, and the radial length of the third blade 23 is L 1 , 0 ≤ L 1 ≤ 0.7L. The measurement process of the radial length L of the two-way turbulence portion 20 is as follows: along the radial orientation of the main body portion 10, the distance from the end of the third blade 23 relatively close to the axial line to the end of the first distal end and the second distal end that is farther from the axial line is denoted as L. In particular, the first disconnection gap 26, the second disconnection gap 26, and the third disconnection gap 26 do not exceed 3 mm.

[0070] Figures 1 - 3The fan shown is applicable to the operating condition of alternating forward and reverse rotation. When the fan rotates forward, the first blade 21 of each two-way spoiler 20 pushes the air through the first spoiler side 211 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 second blade 22 of each two-way spoiler 20 pushes the air through the second spoiler side 221 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 blade 21 and the second 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 blade 21 and the second 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 blades carried by the existing fans all extend along the radial direction of the fan, and the first blade 21 and the second blade 22 carried by the fan of the present invention are longer in length and larger in the area of the windward surface for pushing the air, so that more air can be driven to accelerate the air to form a hot air flow, and further the air volume of the hot air flow is increased.

[0071] Embodiment 2

[0072] In some embodiments, for each two-way 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 surface of the second blade 22 for pushing the air to generate an air flow. When the fan rotates in reverse, the third spoiler side 212 serves as the windward surface of the first blade 21 for pushing the 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 the orientation away from the axial line. The included 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.

[0073] Refer to Figures 5 - 6 , for any one two-way spoiler 20, if the fan is observed from the side of the fan away from the driving member in the 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 with a clockwise yaw around the first proximal end relative to the connection line between the first proximal end and the axial line, and the second blade 22 is arranged with a counterclockwise yaw around the second proximal end relative to the connection line between the second proximal end and the axial line.

[0074] Such as Figure 6As 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 bidirectional 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 bidirectional 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.

[0075] Furthermore, a ventilation cavity 25 is provided at intervals between every two adjacent bidirectional spoiler portions 20. The ventilation cavity 25 between any two adjacent bidirectional spoiler portions 20 is specifically located between the third spoiler side 212 of the first fan blade 21 of one bidirectional spoiler portion 20 and the fourth spoiler side 222 of the second fan blade 22 of another bidirectional spoiler portion 20. One end of the plurality of bidirectional spoiler portions 20 relatively close to the axial line is arranged around the axial line along the circumferential direction of the fan, 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 bidirectional 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 centrifugal action and thus reaches the windward surfaces of the first fan blade 21 and the second fan blade 22.

[0076] Refer to Figures 4 - 5 , one end of the bidirectional 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 around the axial line one by one alternately, 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 bidirectional 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.

[0077] With such a setting, when the fan rotates forward, the return air flow that returns from the inner container 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 container 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.

[0078] Furthermore, each air discharge cavity 25 has an air discharge opening. The air discharge openings of each air discharge cavity 25 are located between 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.

[0079] 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 push speed vector of the fourth flow disturbing side 222 of the second fan blade 22 on one side of the preset radial reference plane to push the air and the push 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 to push the air are symmetric about the preset radial reference plane. Therefore, the radial speed vectors generated by the fourth flow disturbing side 222 to push the air and the third flow disturbing side 212 to push the air are basically equal. In addition, the tangential speed vectors generated by the fourth flow disturbing side 222 to push the air and the third flow disturbing side 212 to push 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.

[0080] In some embodiments, the two-way 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 a 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 two-way spoilers 20, and the other end of the arc is the distal end of the third fan blade 23 of the other two-way 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 containing 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 serve as the windward surface to push the air. When the fan rotates in the reverse direction, the other side of the third fan blade 23 and the third spoiler side 212 jointly serve as the windward surface to push the air.

[0081] With such a setting, when the forward rotation speed of the fan is equal to the reverse rotation speed, the pushing speed vectors of the fourth spoiler side 222 pushing the air and the third spoiler side 212 pushing the air 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 third spoiler side 212 pushing the air are basically equal. In addition, the vector magnitudes of the tangential speed vectors generated by the fourth spoiler side 222 pushing the air and the third spoiler side 212 pushing the air are basically equal, and the vector directions are opposite. 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.

[0082] 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 are provided. If the fan is observed from the side away from the driving member in a 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.

[0083] Optionally, refer to Figure 6, 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°. 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.

[0084] 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 obstacles when the air flow is thrown out of the fan. The reason is that if ∠1 and ∠2 are too large, for any two adjacent bidirectional spoiler parts 20, the first proximal end of the first fan blade 21 of one bidirectional spoiler part 20 and the second proximal end of the second fan blade 22 of the other bidirectional spoiler part 20 will be too close, which means that the minimum width of the air leakage cavity 25 between the two bidirectional spoiler parts 20 is smaller. Therefore, the return air flow entering the middle air inlet area 27 will be difficult to enter the air leakage cavity 25, resulting in a decrease in the air volume entering the air leakage cavity 25 and ultimately weakening the air volume of the fan. The above angle limits for ∠1 and ∠2 ensure both a relatively large radial velocity vector for the hot air flow and the air volume of the hot air flow.

[0085] In other embodiments, the setting method of ∠1≠∠2 can also be adopted, 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.

[0086] Further, refer to Figures 4 - 6, in some embodiments, the second distal end is disconnected from the 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 the 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 air flow to pass through and flow to the leeward side of the third fan blade 23. At this time, the pressure on the windward side of the third fan blade 23 is greater than the 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 ejected from 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 ejected from the fan together; when the fan rotates in the reverse direction, the fifth disconnection gap 26 allows air flow to pass through and flow to the leeward side of the third fan blade 23. At this time, the pressure on the windward side of the third fan blade 23 is greater than the 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 ejected from 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 ejected from the fan together.

[0087] In the second embodiment, the radial length of the two-way 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 measuring process of the radial length L of the two-way turbulent flow portion 20 is as follows: along the radial orientation of the main body portion 10, the distance from the 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.

[0088] Figures 4 - 6The fan shown is applicable to the operating condition 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 discharges the air flow 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 discharges the air flow along the radial direction of the main body 10 and the tangential direction of the two-way spoiler 20. The first fan blade 21 and the second fan blade 22 are both 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 endow the air flow discharged from the fan with more velocity vectors radially outward along the main body 10, thus increasing the wind speed of the hot air flow. In contrast, the fan blades of the 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 the area of the windward surface for pushing 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.

[0089] It should be noted that for the third fan blade 23, whether it is Figures 1 - 3 the third fan blade 23 of the fan in the first embodiment shown, or Figures 4 - 6 the third fan blade 23 of the fan in the second embodiment shown, the windward surface and the leeward side of the third fan blade 23 are not 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.

[0090] 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 embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0091] Those of ordinary skill in the art in this technical field should recognize that the above embodiments are only used to illustrate the present utility model, rather than to limit the present utility model. As long as appropriate changes and variations are made to the above embodiments within the spirit of the present utility model, they 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), which are oriented along the circumference of the main body (10), the first blade (21) and the second blade (22) being arranged in a staggered manner, and the two blades are respectively arranged with radial deflections relative to the main body (10) in different rotation directions, and the interval width between the two blades changes in an increasing trend along the 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 close to the second fan blade (22) is a first spoiler side (211), and the side of the second fan blade (22) relatively close to the first fan blade (21) is a second spoiler side (221), and the interval width between the first spoiler side (211) and the second spoiler side (221) changes in an increasing trend along the direction away from the axial line.

3. The fan according to claim 2, characterized in that The bidirectional spoiler (20) is further configured with a retaining cavity (24) located between the first spoiler side (211) and the second spoiler side (221); the retaining cavity (24) penetrates the bidirectional spoiler (20) along the axial direction of the main body (10) to form a first opening; and the retaining cavity (24) penetrates the bidirectional spoiler (20) along the radial direction of the main body (10) to form a second opening.

4. The fan according to claim 3, characterized in that The first spoiler side (211) and the second spoiler side (221) are symmetrical about a preset radial base plane, the preset radial base plane includes the axial line, and the containing cavity (24) is divided into two equal parts by the preset radial base plane.

5. The fan according to claim 2, 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 far from the axial line.

6. The fan according to claim 5, characterized in that One end of the first blade (21) close to the axial line is disconnected from the third blade (23); and / or one end of the second blade (22) close to the axial line is disconnected from the third blade (23); and / or one end of the first blade (21) close to the axial line is disconnected from one end of the second blade (22) close to the axial line.

7. The fan according to claim 2, characterized in that: A line connecting an end of the first blade (21) relatively close to the axial line to the axial line is a first line, and a minimum angle between the first blade (21) and the first line is 135°; and / or, A line connecting an end of the second blade (22) relatively close to the axial line to the axial line is a second line, and a minimum angle between the second blade (22) and the second line is 135°.

8. The fan according to claim 5, 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.

9. A hot air unit, characterized in that: The invention comprises a driving member and the fan according to any one of claims 1 to 8, 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.

10. A baking and cooking device, characterized in that: Comprising the hot air unit as claimed in claim 9.

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