Range hood

Abstract

The present disclosure is about a range hood. The range hood comprises: an upper main unit and a lower suction structure; the upper main unit comprises a main unit housing, a booster device arranged in the main unit housing, and an electric control box electrically connected to the booster device; the lower suction structure comprises a suction structure housing, which is arranged below the upper main unit; the suction structure housing is provided with an air inlet, and a rotatable main smoke baffle and rotatable side smoke baffles located on both sides of the main smoke baffle are arranged on the side of the air inlet away from the suction structure housing; wherein the rotation axis of the main smoke baffle is perpendicular to the rotation axis of the side smoke baffle; the booster device comprises: a first-stage moving blade axial flow fan, a second-stage moving blade axial flow fan, a motor, a fairing and a Hall speed sensor; the second-stage moving blade axial flow fan is located above the first-stage moving blade axial flow fan. By using the principle of close suction and deepening the cavity smoking, the air inlet of the range hood is placed as close to the wok as possible, thereby improving the smoking efficiency of the range hood and being able to automatically adapt to changes in external wind pressure.

Description

Technical Field

[0001] The present disclosure relates to the technical field of household appliances, and in particular to range hoods. Background Art

[0002] The range hoods on the market generally have a top-mounted fan and a bottom-mounted smoke extraction structure, which are divided into top-suction and near-suction types. When users stir-fry, a lot of oil smoke is generated. Top-suction range hoods have a better smoke extraction effect, but the oil smoke is easy to contact the face, and the effect is not ideal for small amounts of oil smoke; when users stir-fry, the oil smoke generated is relatively small, and the range hood can absorb and exhaust it cleanly, but when stir-frying generates a lot of oil smoke, a lot of oil smoke will escape to the outside, and the exhaust effect is not obvious. Summary of the invention

[0003] In order to overcome the problems existing in the related art, the embodiment of the present disclosure provides a range hood. The technical solution is as follows:

[0004] According to a first aspect of an embodiment of the present disclosure, there is provided a range hood, comprising:

[0005] The upper mainframe and the lower smoking structure;

[0006] The upper host comprises a host housing, a booster device arranged in the host housing, and an electric control box electrically connected to the booster device;

[0007] The lower smoking structure comprises a smoking structure shell, which is arranged below the upper main unit, the smoking structure shell is provided with an air inlet, a rotatable main smoke shield plate and rotatable side smoke shield plates located on both sides of the main smoke shield plate are arranged on the side of the air inlet away from the smoking structure shell; wherein the rotation axis of the main smoke shield plate is perpendicular to the rotation axis of the side smoke shield plate;

[0008] The supercharging equipment includes: a first-stage moving blade axial flow fan, a second-stage moving blade axial flow fan, a first motor, a fairing and a Hall speed sensor;

[0009] The secondary moving blade axial flow fan is located above the primary moving blade axial flow fan, and both the primary moving blade axial flow fan and the secondary moving blade axial flow fan include: a moving blade impeller and a guide impeller; the moving blade impeller includes: a plurality of moving blades arranged along the circumferential direction; the guide impeller includes: a plurality of guide blades arranged along the circumferential direction; when the primary moving blade axial flow fan and the secondary moving blade axial flow fan are working, the moving blade impeller rotates, and the guide impeller does not move;

[0010] The first motor is electrically connected to the impeller in the first-stage impeller axial flow fan and the impeller in the second-stage impeller axial flow fan, and is used to drive the impeller in the first-stage impeller axial flow fan and the impeller in the second-stage impeller axial flow fan to rotate, wherein the rotation speed of the impeller in the second-stage impeller axial flow fan is greater than the rotation speed of the impeller in the first-stage impeller axial flow fan;

[0011] The fairing is located outside the first-stage moving blade axial flow fan and the second-stage moving blade axial flow fan;

[0012] The Hall speed sensor is connected to the first-stage moving blade axial flow fan and the second-stage moving blade axial flow fan, and is used to measure the actual speed of the moving blade impeller in the first-stage moving blade axial flow fan and the moving blade impeller in the second-stage moving blade axial flow fan;

[0013] The control box is electrically connected to the first motor and the Hall speed sensor, respectively, and is used to adjust the speed of the first motor according to the measurement value of the Hall speed sensor so that the actual speeds of the impellers in the first-stage impeller axial flow fan and the impellers in the second-stage impeller axial flow fan meet the preset speed requirements.

[0014] The embodiment of the present disclosure provides a range hood, comprising: an upper main unit and a lower suction structure; the upper main unit comprises a main unit housing, a booster device arranged in the main unit housing, and an electric control box electrically connected to the booster device; the lower suction structure comprises a suction structure housing, which is arranged below the upper main unit, the suction structure housing is provided with an air inlet, a rotatable main smoke baffle and rotatable side smoke baffles located on both sides of the main smoke baffle are arranged on the side of the air inlet away from the suction structure housing; wherein the rotation axis of the main smoke baffle is perpendicular to the rotation axis of the side smoke baffle; the booster device comprises: a first-stage moving blade axial flow fan, a second-stage moving blade axial flow fan, a motor, a fairing and a Hall speed sensor; the second-stage moving blade axial flow fan is located above the first-stage moving blade axial flow fan, and the first-stage moving blade axial flow fan and the second-stage moving blade axial flow fan both comprise: a moving blade impeller and a guide impeller; the moving blade impeller comprises: a plurality of moving blade blades arranged along the circumferential direction; the guide impeller comprises: a plurality of guide blades arranged along the circumferential direction; When the first-stage moving blade axial flow fan is working, the moving blade impeller rotates and the guide impeller does not move; the motor is electrically connected to the moving blade impeller in the first-stage moving blade axial flow fan and the moving blade impeller in the second-stage moving blade axial flow fan, and is used to drive the moving blade impeller in the first-stage moving blade axial flow fan and the moving blade impeller in the second-stage moving blade axial flow fan to rotate, wherein the speed of the moving blade impeller in the second-stage moving blade axial flow fan is greater than the speed of the moving blade impeller in the first-stage moving blade axial flow fan; the fairing is located between the first-stage moving blade axial flow fan and the second-stage moving blade axial flow fan The outside of the machine; the Hall speed sensor is connected to the first-stage moving blade axial flow fan and the second-stage moving blade axial flow fan, and is used to measure the actual speed of the moving blade impeller in the first-stage moving blade axial flow fan and the moving blade impeller in the second-stage moving blade axial flow fan; the control box is electrically connected to the motor and the Hall speed sensor, respectively, and is used to adjust the speed of the motor according to the measured value of the Hall speed sensor, so that the actual speed of the moving blade impeller in the first-stage moving blade axial flow fan and the moving blade impeller in the second-stage moving blade axial flow fan meets the preset speed requirement. Among them, through the principle of close suction and deepening the cavity smoking, the air inlet of the range hood is placed as close to the wok as possible, which improves the smoking efficiency of the range hood, and can automatically adapt to the changes in external wind pressure, increasing the reliability of the smoking effect.

[0015] In one embodiment,

[0016] The first motor is located above the second-stage moving blade axial flow fan;

[0017] or,

[0018] The first motor is located between the first-stage moving blade axial flow fan and the second-stage moving blade axial flow fan.

[0019] In one embodiment, the first motor includes: a primary motor and a secondary motor;

[0020] The first-stage motor is located between the first-stage moving blade axial flow fan and the second-stage moving blade axial flow fan;

[0021] The secondary motor is located above the secondary moving blade axial flow fan.

[0022] In one embodiment, it further comprises: a three-stage moving blade axial flow fan,

[0023] The three-stage moving blade axial flow fan is located above the two-stage moving blade axial flow fan;

[0024] The first motor is also electrically connected to the impeller in the three-stage impeller axial flow fan, and is used to drive the impeller in the three-stage impeller axial flow fan to rotate, wherein the rotation speed of the impeller in the three-stage impeller axial flow fan is greater than the rotation speed of the impeller in the one-stage impeller axial flow fan.

[0025] The fairing is also located outside the three-stage moving blade axial flow fan;

[0026] The Hall speed sensor is also connected to the moving blade impeller in the three-stage moving blade axial flow fan, and is used to measure the actual speed of the moving blade impeller in the three-stage moving blade axial flow fan.

[0027] In one embodiment,

[0028] The first motor is located between the first-stage moving blade axial flow fan and the second-stage moving blade axial flow fan.

[0029] In one embodiment, the first motor includes: a three-pole motor and a four-pole motor;

[0030] The three-stage motor is located between the first-stage moving blade axial flow fan and the second-stage moving blade axial flow fan;

[0031] The four-stage motor is located above the three-stage moving blade axial flow fan.

[0032] In one embodiment, the moving blade is an airfoil blade; the angle between the moving blade and the vertical direction is less than or equal to 40 degrees and greater than or equal to 25 degrees; the number of the moving blade is less than or equal to 18 and greater than or equal to 14.

[0033] In one embodiment,

[0034] The guide vane is in an arc shape, and the angle between the arc tangent of the outlet end of the guide vane and the frontal line is 90°. The number of the guide vanes is less than or equal to 14 and greater than or equal to 10; the sum of the angle between the inlet end of the guide vane and the vertical direction and the angle between the moving blade and the vertical direction is less than or equal to 90 degrees and greater than or equal to 80 degrees.

[0035] In one embodiment, the first motor is a brushless DC motor.

[0036] In one embodiment, the side smoke shield comprises:

[0037] Fixed part and board surface;

[0038] The fixing part and the plate surface are connected via a rotating shaft, the fixing part is fixed on the outer shell of the smoking structure, and the plate surface can rotate around the rotating shaft.

[0039] In one embodiment, the smoking structure housing is further provided with: a second motor;

[0040] The second motor is electrically connected to the side smoke baffle plate and is used to control the rotation of the side smoke baffle plate.

[0041] In one embodiment, the smoking structure shell is further provided with: a rotating support structure and a first support rod; the upper main unit further comprises: a push rod motor, a connecting rod, and a second support rod;

[0042] The push rod motor is located inside the main body housing, the movement direction of the push rod in the push rod motor is the direction of gravity, and the movable end of the push rod in the push rod motor is connected to one end of the first connecting rod;

[0043] One side of the rotating support structure is connected to the main smoke shield, and the other side of the rotating support structure is connected to the other end of the first connecting rod;

[0044] The electric control box is electrically connected to the push rod motor and is used to control the working state of the push rod motor;

[0045] One end of the first support rod is connected to the smoking structure shell, the other end of the first support rod is hinged to one end of the second support rod, and the side wall of the second support rod is connected to the main smoke baffle plate, for supporting the main smoke baffle plate to be located at the current rotation position when the main smoke baffle plate rotates.

[0046] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0048] Figure 1 It is a schematic structural diagram of a range hood according to an exemplary embodiment.

[0049] Figure 2 is a schematic structural diagram of a boosting device according to an exemplary embodiment.

[0050] Figure 3is a schematic structural diagram of a boosting device according to an exemplary embodiment.

[0051] Figure 4 is a schematic structural diagram of a boosting device according to an exemplary embodiment.

[0052] Figure 5 is a schematic structural diagram of a boosting device according to an exemplary embodiment.

[0053] Figure 6 is a schematic structural diagram of a boosting device according to an exemplary embodiment.

[0054] Figure 7 It is a schematic structural diagram of a side smoke shield according to an exemplary embodiment.

[0055] Figure 8 is a front view of a range hood according to an exemplary embodiment.

[0056] Fig. 9 is a bottom view of a range hood according to an exemplary embodiment.

[0057] Fig.10 It is a schematic structural diagram of a range hood when a main smoke baffle is closed according to an exemplary embodiment.

[0058] Fig.11 It is a schematic structural diagram of a range hood when a main smoke baffle is closed according to an exemplary embodiment.

[0059] Fig.12 It is a schematic structural diagram of a range hood when a main smoke baffle is closed according to an exemplary embodiment.

[0060] Fig.13 The diagram is a schematic structural diagram of a side smoke baffle in a range hood when it is half-opened according to an exemplary embodiment.

[0061] Fig.14 The diagram is a schematic structural diagram of a side smoke baffle in a range hood when it is half-opened according to an exemplary embodiment.

[0062] Fig.15 The diagram is a schematic structural diagram of a side smoke baffle in a range hood when it is half-opened according to an exemplary embodiment.

[0063] Fig.16 It is a schematic structural diagram of a range hood when a main smoke baffle and a side smoke baffle are fully opened according to an exemplary embodiment.

[0064] Fig.17 It is a schematic structural diagram of a range hood when a main smoke baffle and a side smoke baffle are fully opened according to an exemplary embodiment.

[0065] Fig.18 It is a schematic structural diagram of a range hood when a main smoke baffle and a side smoke baffle are fully opened according to an exemplary embodiment. DETAILED DESCRIPTION

[0066] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0067] Figure 1 is a schematic diagram of the structure of a range hood according to an exemplary embodiment. Figure 1 As shown, including:

[0068] An upper main engine 1 and a lower smoking structure 2;

[0069] The upper host 1 includes a host housing 11, a booster device 12 disposed in the host housing 11, and an electric control box 13 electrically connected to the booster device 12;

[0070] The lower smoking structure 2 includes a smoking structure housing 1, which is arranged below the upper main unit 1. The smoking structure housing 21 is provided with an air inlet 22. A rotatable main smoke shield 23 and rotatable side smoke shields 24 located on both sides of the main smoke shield 23 are arranged on the side of the air inlet 22 away from the smoking structure housing 21; wherein the rotation axis of the main smoke shield 23 is perpendicular to the rotation axis of the side smoke shield 24;

[0071] The supercharging device 12 includes: a first-stage moving blade axial flow fan 121, a second-stage moving blade axial flow fan 122, a first motor 123, a fairing 124 and a Hall speed sensor 125;

[0072] The second-stage moving blade axial flow fan 122 is located above the first-stage moving blade axial flow fan 121. Both the first-stage moving blade axial flow fan 121 and the second-stage moving blade axial flow fan 122 include: a moving blade impeller and a guide impeller; the moving blade impeller includes: a plurality of moving blades (1211, 1221) arranged along the circumferential direction; the guide impeller includes: a plurality of guide blades (1212, 1222) arranged along the circumferential direction; when the first-stage moving blade axial flow fan 121 and the second-stage moving blade axial flow fan 122 are working, the moving blade impeller rotates and the guide impeller does not move;

[0073] a first motor 123, electrically connected to the impeller in the first-stage impeller axial flow fan 121 and the impeller in the second-stage impeller axial flow fan 122, and used to drive the impeller in the first-stage impeller axial flow fan 121 and the impeller in the second-stage impeller axial flow fan 122 to rotate, wherein the rotation speed of the impeller in the second-stage impeller axial flow fan 122 is greater than the rotation speed of the impeller in the first-stage impeller axial flow fan 121;

[0074] The fairing 124 is located outside the first-stage moving blade axial flow fan 121 and the second-stage moving blade axial flow fan 122;

[0075] A Hall speed sensor 125 is connected to the first-stage moving blade axial flow fan 121 and the second-stage moving blade axial flow fan 122, and is used to measure the actual speed of the moving blade impeller in the first-stage moving blade axial flow fan 121 and the moving blade impeller in the second-stage moving blade axial flow fan 122;

[0076] The control box is electrically connected to the first motor 123 and the Hall speed sensor 125, respectively, and is used to adjust the speed of the first motor 123 according to the measurement value of the Hall speed sensor 125, so that the actual speeds of the impellers in the first-stage impeller axial flow fan 121 and the impellers in the second-stage impeller axial flow fan 122 meet the preset speed requirements.

[0077] The present invention adopts the principle of multi-stage moving blade axial flow fan supercharging and senses the change of external resistance through the change of fan speed, thereby adjusting the wind pressure output of the fan to achieve the purpose of adapting to the external resistance, thereby improving the smoke extraction effect of the range hood.

[0078] Specifically, the present disclosure includes a first-stage moving blade axial flow fan 121 and a second-stage moving blade axial flow fan 122. When the first-stage moving blade axial flow fan 121 and the second-stage moving blade axial flow fan 122 are working, the moving blade impeller rotates, the guide impeller remains stationary, and the rotation speed of the moving blade impeller in the second-stage moving blade axial flow fan 122 is greater than the rotation speed of the moving blade impeller in the first-stage moving blade axial flow fan 121. In the present disclosure, the second-stage moving blade axial flow fan 122 is used to adjust the air volume and air pressure to achieve a boosting effect.

[0079] Among them, the Hall speed sensor 125, the first-stage moving blade axial flow fan 121, the second-stage moving blade axial flow fan 122 and the control box constitute a PID precise control system for adapting to changes in external wind pressure resistance. When the external wind pressure resistance changes, the fan speed also changes accordingly. During adjustment, it is assumed that the speed design values ​​of the moving blade impellers in the first-stage moving blade axial flow fan 121 and the moving blade impellers in the second-stage moving blade axial flow fan 122 are preset speeds, that is, during operation, the Hall speed sensor 125 is required to measure that the actual speeds of the moving blade impellers in the first-stage moving blade axial flow fan 121 and the moving blade impellers in the second-stage moving blade axial flow fan 122 are the above-mentioned preset speeds. If the difference between the preset speed and the actual speed of the moving blade impellers in the first-stage moving blade axial flow fan 121 and the moving blade impellers in the second-stage moving blade axial flow fan 122 obtained by the Hall speed sensor 125 is greater than zero, it is necessary to increase the speed of the first motor 123. When the difference is less than zero, reduce the speed of the first motor 123 so that the actual speeds of the moving blade impellers in the first-stage moving blade axial flow fan 121 and the moving blade impellers in the second-stage moving blade axial flow fan 122 are the above-mentioned preset speeds.

[0080] Before that, the relationship curves between the air volume Q, the air pressure P and the actual rotation speeds of the impellers in the first-stage impeller axial flow fan 121 and the impellers in the second-stage impeller axial flow fan 122 can be measured in advance after the range hood is installed in the public flue.

[0081] The range hood disclosed in the present invention mainly has three modes: normal cooking, stir-frying and ventilation. The normal cooking mode has a small air volume and pressure, the stir-frying mode has the largest air volume and pressure, and the ventilation mode has a medium air volume.

[0082] The present invention adopts the principle of deepening the inhalation cavity. The closer the air inlet is to the wok and the deeper the inhalation cavity is, the easier it is to suck out the oil smoke. When the user starts the range hood, the main smoke baffle 23 starts to rotate and stops when it rotates to 45°; at this time, the side smoke baffle 24 starts to rotate and stops when it rotates 90°; at this time, the range hood automatically enters the normal cooking mode; at the same time, the user can also manually select the three modes of normal cooking, stir-frying and ventilation; when the external wind pressure resistance changes, the rotation speed of the first-stage moving blade axial flow fan 121 and the second-stage moving blade axial flow fan 122 changes, and the Hall speed sensor 125 can detect the rotation speed of the range hood. In order to detect the speed changes of the first-stage moving blade axial flow fan 121 and the second-stage moving blade axial flow fan 122, the PID precise control system composed of the Hall speed sensor 125, the electronic control box and the fan can accurately control the speed so that the air volume and air pressure of the first-stage moving blade axial flow fan 121 and the second-stage moving blade axial flow fan 122 remain stable; when the user shuts down the machine, the side smoke shield 24 is first controlled to rotate, and stops when the side smoke shield 24 is closed; the main smoke shield 23 is controlled to rotate, and stops when the main smoke shield 23 is closed.

[0083] In summary, this patent utilizes the principle of close suction and deepening the cavity smoking, and places the air inlet of the range hood as close to the wok as possible, thereby improving the smoking efficiency of the range hood, and being able to automatically adapt to changes in external wind pressure, thereby increasing the reliability of the smoking effect.

[0084] The embodiment of the present disclosure provides a range hood, comprising: an upper main unit and a lower suction structure; the upper main unit comprises a main unit housing, a booster device arranged in the main unit housing, and an electric control box electrically connected to the booster device; the lower suction structure comprises a suction structure housing, which is arranged below the upper main unit, the suction structure housing is provided with an air inlet, a rotatable main smoke baffle and rotatable side smoke baffles located on both sides of the main smoke baffle are arranged on the side of the air inlet away from the suction structure housing; wherein the rotation axis of the main smoke baffle is perpendicular to the rotation axis of the side smoke baffle; the booster device comprises: a first-stage moving blade axial flow fan, a second-stage moving blade axial flow fan, a motor, a fairing and a Hall speed sensor; the second-stage moving blade axial flow fan is located above the first-stage moving blade axial flow fan, and the first-stage moving blade axial flow fan and the second-stage moving blade axial flow fan both comprise: a moving blade impeller and a guide impeller; the moving blade impeller comprises: a plurality of moving blade blades arranged along the circumferential direction; the guide impeller comprises: a plurality of guide blades arranged along the circumferential direction; When the first-stage moving blade axial flow fan is working, the moving blade impeller rotates and the guide impeller does not move; the motor is electrically connected to the moving blade impeller in the first-stage moving blade axial flow fan and the moving blade impeller in the second-stage moving blade axial flow fan, and is used to drive the moving blade impeller in the first-stage moving blade axial flow fan and the moving blade impeller in the second-stage moving blade axial flow fan to rotate, wherein the speed of the moving blade impeller in the second-stage moving blade axial flow fan is greater than the speed of the moving blade impeller in the first-stage moving blade axial flow fan; the fairing is located between the first-stage moving blade axial flow fan and the second-stage moving blade axial flow fan The outside of the machine; the Hall speed sensor is connected to the first-stage moving blade axial flow fan and the second-stage moving blade axial flow fan, and is used to measure the actual speed of the moving blade impeller in the first-stage moving blade axial flow fan and the moving blade impeller in the second-stage moving blade axial flow fan; the control box is electrically connected to the motor and the Hall speed sensor, respectively, and is used to adjust the speed of the motor according to the measured value of the Hall speed sensor, so that the actual speed of the moving blade impeller in the first-stage moving blade axial flow fan and the moving blade impeller in the second-stage moving blade axial flow fan meets the preset speed requirement. Among them, through the principle of close suction and deepening the cavity smoking, the air inlet of the range hood is placed as close to the wok as possible, which improves the smoking efficiency of the range hood, and can automatically adapt to the changes in external wind pressure, increasing the reliability of the smoking effect.

[0085] In one embodiment, Figure 1 and Figure 2 As shown, the first motor 123 is located above the two-stage moving blade axial flow fan 122.

[0086] In another embodiment, Figure 3 As shown, the first motor 123 is located between the first-stage moving blade axial flow fan 121 and the second-stage moving blade axial flow fan 122 .

[0087] In one embodiment, in order to improve the boost effect, Figure 4 As shown, the first motor 123 includes: a primary motor 1231 and a secondary motor 1232;

[0088] The first-stage motor 1231 is located between the first-stage moving blade axial flow fan 121 and the second-stage moving blade axial flow fan 122;

[0089] The secondary motor 1232 is located above the secondary moving blade axial flow fan 122 .

[0090] In this embodiment, the first-stage moving blade axial flow fan 121 is driven by a first-stage motor 1231 , and the second-stage moving blade axial flow fan 122 is driven by a second-stage motor 1232 .

[0091] In one embodiment, Figure 5 As shown, in order to achieve a better supercharging effect, it also includes: a three-stage moving blade axial flow fan 126 (the three-stage moving blade axial flow fan 126 has a similar structure to the first-stage moving blade axial flow fan 121 and the second-stage moving blade axial flow fan 122, and also includes: a moving blade impeller and a guide impeller; the moving blade impeller includes: a plurality of moving blades (1261) arranged along the circumferential direction; the guide impeller includes: a plurality of guide blades (1262) arranged along the circumferential direction);

[0092] The third-stage moving blade axial flow fan 126 is located above the second-stage moving blade axial flow fan 122;

[0093] The first motor 123 is also electrically connected to the moving blade impeller in the three-stage moving blade axial flow fan 126, and is used to drive the moving blade impeller in the three-stage moving blade axial flow fan 126 to rotate, wherein the speed of the moving blade impeller in the three-stage moving blade axial flow fan 126 is greater than the speed of the moving blade impeller in the first-stage moving blade axial flow fan 121.

[0094] The fairing 124 is also located outside the three-stage moving blade axial flow fan 126;

[0095] The Hall speed sensor 125 is also connected to the moving blade impeller in the three-stage moving blade axial flow fan 126 and is used to measure the actual speed of the moving blade impeller in the three-stage moving blade axial flow fan 126 .

[0096] By jointly regulating the air volume and air pressure by the second-stage moving blade axial flow fan 122 and the third-stage moving blade axial flow fan 126, the boosting effect can be improved.

[0097] In one embodiment, Figure 5 As shown, the first motor 123 is located between the first-stage moving blade axial flow fan 121 and the second-stage moving blade axial flow fan 122 .

[0098] In one embodiment, Figure 6As shown, the first motor 123 includes: a three-stage motor 1234 and a four-stage motor 1234;

[0099] The third-stage motor 1234 is located between the first-stage moving blade axial flow fan 121 and the second-stage moving blade axial flow fan 122;

[0100] The four-stage motor 1234 is located above the three-stage moving blade axial flow fan 126.

[0101] In this embodiment, the first-stage moving blade axial flow fan 121 is driven by a three-stage motor 1234 , and the second-stage moving blade axial flow fan 122 and the third-stage moving blade axial flow fan 126 are driven by a four-stage motor 1234 .

[0102] In the above embodiments, the moving blades are airfoil blades; the angle between the moving blades and the vertical direction (also referred to as the installation angle of the moving blades) is less than or equal to 40 degrees and greater than or equal to 25 degrees; the number of moving blades is less than or equal to 18 and greater than or equal to 14.

[0103] For example, the moving blades may adopt a NACA0010 airfoil, with an installation angle of 30° and 16 moving blades.

[0104] In the above embodiments, the guide vane is in an arc shape, the angle between the arc tangent at the outlet end of the guide vane and the frontal line is 90°, the number of guide vanes is less than or equal to 14, and greater than or equal to 10; the sum of the angle between the inlet end of the guide vane and the vertical direction (also referred to as: the inlet end installation angle) and the angle between the moving blade and the vertical direction is less than or equal to 90 degrees, and greater than or equal to 80 degrees.

[0105] For example, the guide vane is in an arc shape with an arc diameter of about 240 mm, an installation angle of 50° at the inlet end, an angle between the arc tangent and the frontal line at the outlet end is 90°, and the number of guide vanes is 12.

[0106] In one embodiment, the first motor 123 is a brushless DC motor, which is used to adjust the rotation speed of each fan.

[0107] The structure and working process of the range hood disclosed in the present invention are described in detail below.

[0108] The range hood adopts a multi-stage moving blade axial flow fan, which can be a two-stage moving blade axial flow fan 122 (in this case including: a first-stage moving blade axial flow fan 121 and a second-stage moving blade axial flow fan 122) and a three-stage moving blade axial flow fan 126 (in this case including: a first-stage moving blade axial flow fan 121, a second-stage moving blade axial flow fan 122 and a third-stage moving blade axial flow fan 126). The moving blades in the moving blade axial flow fans at all levels adopt NACA0010 airfoil, the installation angle is 30°, and the number of blades is 16; the guide vanes in the moving blade axial flow fans at all levels are arc-shaped, the arc diameter is about 240mm, the installation angle at the inlet end is 50°, the tangent angle of the arc at the outlet end and the frontal angle are 90°, and the number of blades is 12; a Hall speed sensor 125 is also installed on the fan to measure the fan speed (that is, for measuring the actual speed of the moving blade impeller in the first-stage moving blade axial flow fan 121, the moving blade impeller in the second-stage moving blade axial flow fan 122 and the third-stage moving blade axial flow fan 126), and the first motor 123 adopts a DC brushless motor to adjust the speed of the fan; when the moving blade axial flow fans at all levels are working, the moving blade impeller rotates and the guide impeller does not move; the direction of the moving blade impellers in the moving blade axial flow at all levels is the same.

[0109] Further, the two-stage moving blade axial flow fan 122 has a (such as Figure 1 As shown), b(as shown Figure 2 As shown), c(as Figure 3 Three models:

[0110] Model a mainly consists of a primary moving blade, a primary guide blade (the moving blade 21 in the primary moving blade axial flow fan 121 is called a primary moving blade, and the guide blade in the primary moving blade axial flow fan 121 is called a primary guide blade), a secondary moving blade, a secondary guide blade (the moving blade in the secondary moving blade axial flow fan 122 is called a secondary moving blade, and the guide blade in the secondary moving blade axial flow fan 122 is called a secondary guide blade), a first motor 123, a fairing 124, a fan housing and a Hall speed sensor 125; the motor can be installed on the top of the secondary moving blade axial flow fan 122 to drive the primary moving blade and the secondary moving blade to rotate; the Hall speed sensor 125 is used to measure the speed of the primary moving blade axial flow fan 121 and the secondary moving blade axial flow fan 122;

[0111] The composition of model b is the same as that of model a, the main difference being that the first motor 123 is installed between the first-stage moving blade axial flow fan 121 and the second-stage moving blade axial flow fan 122;

[0112] Model c has one more motor than model a (including: primary motor 1231 and secondary motor 1232), the primary moving blades are driven by the primary motor 1231, the secondary moving blades are driven by the secondary motor 1232, and the rotation speed of the secondary moving blades is greater than or equal to the rotation speed of the primary moving blades;

[0113] Further, the three-stage moving blade axial flow fan 126 has c (such as Figure 4 As shown), d(as Figure 5 Two models shown:

[0114] Model c mainly consists of a primary moving blade, a primary guide blade, a secondary moving blade, a secondary guide blade, a tertiary moving blade, a tertiary guide blade (the moving blades in the three-stage moving blade axial flow fan 126 are called tertiary moving blades, and the guide blades in the three-stage moving blade axial flow fan 126 are called tertiary guide blades), a motor, a fairing 124, a fan housing and a Hall speed sensor 125; the moving blades in each level of the moving blade axial flow fan are driven by a motor; the Hall speed sensor 125 is used to measure the fan speed;

[0115] Model d has one more motor than model c (including: three-stage motor 1234 and four-stage motor 1234 at this time), the four-stage motor 1234 is installed above the three-stage moving blade axial flow fan 126, and the three-stage motor 1234 is installed between the first-stage guide vane and the second-stage moving blade; there are two control modes for the moving blades, one is that the first-stage moving blades and the second-stage moving blades are driven by the three-stage motor 1234, and the third-stage moving blades are driven by the four-stage motor 1234, and the other is that the first-stage moving blades are driven by the three-stage motor 1234, and the second-stage moving blades and the third-stage moving blades are driven by the four-stage motor 1234; the rotation speed of the moving blades driven by the four-stage motor 1234 is greater than the rotation speed of the moving blades driven by the three-stage motor 1234;

[0116] Furthermore, when there is only one motor, the speed ω1 of the fan is in the range of (1500, 3000). After the fan is installed on the range hood, the relationship curves of air volume Q, wind pressure P and speed ω1 are measured respectively. When there are two motors, the speed ω1 of the first-stage motor 1231\third-stage motor 1234 has a value range of (1500, 2000), and the speed ω2 of the second-stage motor 1232\fourth-stage motor 1234 has a value range of (2000, 3000). The second-stage motor 1232\fourth-stage motor 1234 is used to adjust the air volume and air pressure. After the fan is installed in the flue, the relationship curves of the air volume Q, air pressure P and the speed ω2 are measured respectively.

[0117] Furthermore, the Hall speed sensor 125, the fan, and the control box constitute a PID precision control system to adapt to changes in external wind pressure resistance; when the external wind pressure resistance changes, the fan speed also changes accordingly. The main control methods are as follows:

[0118] For a model with only one motor, the motor speed design value is ω0; the Hall speed sensor 125 measurement value is ω c ; The difference between the design value and the measured value Δω=ω0-ωc : When Δω>0, increase the speed ω1; when Δω<0, decrease the speed ω1; when Δω=0, do not adjust the speed;

[0119] For the model with two-stage motor, the motor speed design value is ω0; the Hall speed sensor 125 measurement value is ω c ; The difference between the design value and the measured value Δω=ω0-ω c : When Δω>0, increase the speed ω2; when Δω<0, decrease the speed ω2; when Δω=0, do not adjust the speed;

[0120] This patent uses the principle of multi-stage moving blade axial flow fan boosting, and at the same time senses the change of external resistance through the change of fan speed, adjusts the fan air pressure output, thereby achieving the purpose of responding to external resistance and improving the kitchen environment processing capacity.

[0121] In one embodiment, Figure 7 As shown, the side smoke baffle 24 includes:

[0122] A fixing portion 241 and a plate surface 242;

[0123] The fixing portion 241 and the plate surface 242 are connected via a rotating shaft 243 . The fixing portion 241 is fixed on the smoking structure housing 21 , and the plate surface 242 can rotate around the rotating shaft.

[0124] In one embodiment, Figure 8 As shown, the smoking structure housing 21 is further provided with: a second motor 25;

[0125] The second motor 25 is electrically connected to the side smoke baffle 24 and is used to control the rotation of the side smoke baffle 24 .

[0126] Since two side smoke baffles 24 are provided, each side smoke baffle 24 corresponds to a second motor 25 , and therefore, two second motors 25 need to be provided.

[0127] In one embodiment, Figure 1 and 8 As shown, the smoking structure housing 21 is further provided with: a rotating support structure 26 and a first support rod 27; the upper mainframe 1 also includes: a push rod motor 14, a connecting rod 15 and a second support rod 16; the first support rod 27 and the second support rod 16 are connected by a rotating shaft 17;

[0128] The push rod motor 14 is located inside the main body housing 11. The movement direction of the push rod in the push rod motor 14 is the direction of gravity. The movable end of the push rod in the push rod motor 14 is connected to one end of the first connecting rod 15.

[0129] One side of the rotating support structure 26 is connected to the main smoke baffle 23, and the other side of the rotating support structure 26 is connected to the other end of the first connecting rod 15;

[0130] The electric control box is electrically connected to the push rod motor 14 and is used to control the working state of the push rod motor 14;

[0131] One end of the first support rod 27 is connected to the smoking structure shell 21, and the other end of the first support rod 27 is hinged to one end of the second support rod 16. The side wall of the second support rod 16 is connected to the main smoke baffle 23, and is used to support the main smoke baffle 23 to be located at the current rotation position when the main smoke baffle 23 rotates.

[0132] The second support rod 16 is fixed to the main housing; one end of the first support rod 27 is fixed to the main smoke baffle 23, and the other end is connected to the second support rod 16 through a rotating shaft, and the main smoke baffle 23 can rotate around the rotating shaft; when the range hood is working, the main smoke baffle 23 is at an angle of 45° to the vertical direction;

[0133] Furthermore, the push rod motor 14 is fixed on the main housing, the main smoke baffle 23 rotating bracket is fixed on the smoke baffle, and the main smoke baffle 23 rotating bracket is connected to the push rod motor 14 through the connecting rod 15; when the push rod motor 14 is working, the push rod motor 14 pushes the connecting rod 15 to move forward, and indirectly pushes the main smoke baffle 23 to rotate;

[0134] Furthermore, the side smoke shield 24 is fixedly mounted on the smoking structure housing 21 , the second motor 25 is mounted on the smoking structure housing 21 , the second motor 25 is directly connected to the rotating shaft of the side smoke shield 24 via a rotating shaft, and the second motor 25 controls the rotation of the side smoke shield 24 .

[0135] In order to improve the suction and exhaust effect of the range hood, the coverage area of ​​the main smoke baffle 23 is less than or equal to the area of ​​the air inlet 22 .

[0136] By setting the coverage area of ​​the main smoke baffle 23 to be smaller than or equal to the area of ​​the air inlet 22, there is no need to open the main smoke baffle 23 when there is a small amount of oil smoke. At this time, the main smoke baffle 23 is closed and the oil smoke can be sucked into the lower smoke extraction structure 2 through the exposed air inlet 22. Therefore, when there is a small amount of oil smoke, it can be effectively sucked and discharged without opening the main smoke baffle 23.

[0137] In one implementation, in order to enhance the smoke blocking effect of the main smoke shield 23, the rotation angle of the main smoke shield 23 is less than or equal to 45 degrees. That is, the angle between the width direction of the main smoke shield 23 and the gravity direction is less than or equal to 45 degrees.

[0138] In one embodiment, Figure 1 As shown, the lower smoking structure 2 further includes: an oil cup 28;

[0139] The oil cup 28 is located below the housing 21 of the smoke collecting structure.

[0140] Oil stains are often deposited in the range hood, so an oil cup 28 is provided at the bottom of the range hood. When oil stains are deposited in the range hood, the oil stains will fall into the oil cup 28 under the action of gravity, thereby preventing the oil stains from falling on the stove top or gas stove, and effectively improving the user experience.

[0141] A push rod is provided in the push rod motor 14, and the push rod motor 14 can control the push rod to perform telescopic linear motion when working. In the present disclosure, the push rod motor 14 and the connecting rod 15 are provided to drive the rotation of the main smoke baffle 23. The movable end of the push rod in the push rod motor 14 is connected to one end of the connecting rod 15, and the other end of the connecting rod 15 is connected to the main smoke baffle 23. When working, the push rod motor 14 works to control the push rod to extend downward and move in a straight line. At this time, the push rod will drive the connecting rod 15 to move forward (that is, move toward the user), and the connecting rod 15 will drive the main smoke baffle 23 to rotate in the direction away from the air inlet 22, so as to open the main smoke baffle 23. When the main smoke baffle 23 rotates to a preset angle, the push rod motor 14 stops working, and at this time the second motor 25 starts working to control the side smoke baffle 24 to start rotating. When the side smoke baffle 24 rotates 90°, it stops, and the oil smoke passes through The air enters the range hood through the air inlet 22 (cover suction) and is discharged to the outside through the booster device 12; when the work stops, the second motor 25 starts to work, and the second motor 25 controls the side smoke baffle 24 to rotate, and stops when the side smoke baffle 24 is closed; the push rod motor 14 controls the push rod to shorten and move in a straight line, driving the connecting rod 15 to contract, and the connecting rod 15 drives the main smoke baffle 23 to start rotating in the direction close to the air inlet 22, and at the same time, the first side smoke baffles 24 on both sides of the main smoke baffle 23 are folded until the main smoke baffle 23 returns to the initial state.

[0142] When the area of ​​the main smoke baffle 23 is relatively large, the main smoke baffle 23 can be reliably realized by providing the push rod motor 14 and the connecting rod 15 .

[0143] Since the rotating support structure 26 is connected to the push rod in the push rod motor 14 through the connecting rod 15, when working, the push rod motor 14 works to control the push rod to extend downward and move in a straight line. At this time, the push rod will drive the connecting rod 15 to move forward (that is, move toward the user), and the connecting rod 15 will drive the rotating support structure 26 to move toward the user, and the rotating support structure 26 will drive the main smoke baffle 23 to rotate in the direction away from the air inlet 22, thereby opening the main smoke baffle 23, and at the same time, the main smoke baffle 23 drives the first side smoke baffles 24 on both sides to open. When the main smoke deflector 23 rotates to a preset angle, the push rod motor 14 stops working, and the oil smoke enters the range hood through the air inlet 22 (cover suction), and is discharged to the outside through the added equipment; when stopping working, the push rod motor 14 controls the push rod to shorten and move in a straight line, driving the connecting rod 15 to contract, and the connecting rod 15 drives the rotating support structure 26 to move in the direction away from the user, thereby driving the main smoke deflector 23 to start rotating in the direction close to the air inlet 22, and at the same time, the first side smoke deflectors 24 on both sides of the main smoke deflector 23 are folded until the main smoke deflector 23 returns to its initial state.

[0144] Since the rotating support structure 26 can not only drive the main smoke shield 23 to rotate, but also support the main smoke shield 23 during the rotation process and when the main smoke shield 23 rotates to a preset position, the rotating support structure 26 can improve the reliability of the rotation of the main smoke shield 23.

[0145] The main smoke baffle 23 is supported by the side wall of the second support rod 1672. Since the side wall area of ​​the second support rod 1672 is larger, the support is more reliable.

[0146] Figure 10-12 is a schematic structural diagram of a range hood when the main smoke baffle is closed according to an exemplary embodiment. Figure 13-15 is a schematic structural diagram of a side smoke baffle in a range hood when it is half-opened according to an exemplary embodiment; Figure 16-18 It is a schematic structural diagram of a range hood when a main smoke baffle and a side smoke baffle are fully opened according to an exemplary embodiment.

[0147] Combination Figure 10-18 Introduce the working process of the range hood in this disclosure:

[0148] Furthermore, the range hood mainly has three modes: normal cooking, stir-frying and ventilation. The normal cooking mode has a small air volume and pressure, the stir-frying mode has the largest air volume and pressure, and the ventilation mode has a medium air volume.

[0149] This patent adopts the principle of close suction and deepening the smoking cavity. The closer the air inlet is to the wok and the deeper the smoking cavity is, the easier it is to suck out the oil smoke. Figure 10-12In the state shown, the main smoke shield 23 is closed. When the user starts the range hood, the push rod motor 14 starts to work, and the push rod motor 14 pushes the main smoke shield 23 to rotate through the connecting rod 15. When the main smoke shield 23 rotates to 45 degrees, it stops; at this time, the second motor 25 starts to work, controls the side smoke shield 24 to start rotating, and stops when the side smoke shield 24 rotates 90 degrees. Figure 16-18 The state shown; at this time, the fan automatically enters the normal cooking mode; the user can choose between three modes: normal cooking, stir-frying and ventilation; when the external wind pressure resistance changes, the speed of the fan changes, and the change in the fan speed can be detected by the Hall speed sensor 125. At this time, the PID precise control system composed of the Hall speed sensor 125, the electronic control box and the fan can accurately control the speed so that the fan air volume and wind pressure remain stable; when the user turns off the machine, the second motor 25 starts working, and the second motor 25 controls the side smoke baffle 24 to rotate, and stops when the side smoke baffle 24 is closed; the push rod motor 14 controls the main smoke baffle 23 to rotate, and stops when the main smoke baffle 23 is closed, and returns to the state as shown. Figure 10-12 This patent uses the principle of close suction and deepening the cavity smoking to place the air inlet of the oil hood as close to the wok as possible, thereby improving the smoking efficiency of the oil hood and being able to automatically adapt to changes in external wind pressure to increase the reliability of the smoking effect.

[0150] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0151] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A range hood, characterized in that: include: The upper mainframe and the lower smoking structure; The upper host comprises a host housing, a booster device arranged in the host housing, and a control box electrically connected to the booster device; The lower smoking structure comprises a smoking structure shell, which is arranged below the upper main unit, the smoking structure shell is provided with an air inlet, a rotatable main smoke shield plate and rotatable side smoke shield plates located on both sides of the main smoke shield plate are arranged on the side of the air inlet away from the smoking structure shell; wherein the rotation axis of the main smoke shield plate is perpendicular to the rotation axis of the side smoke shield plate; The supercharging equipment includes: a first-stage moving blade axial flow fan, a second-stage moving blade axial flow fan, a first motor, a fairing and a Hall speed sensor; The secondary moving blade axial flow fan is located above the primary moving blade axial flow fan, and both the primary moving blade axial flow fan and the secondary moving blade axial flow fan include: a moving blade impeller and a guide impeller; the moving blade impeller includes: a plurality of moving blades arranged along the circumferential direction; the guide impeller includes: a plurality of guide blades arranged along the circumferential direction; when the primary moving blade axial flow fan and the secondary moving blade axial flow fan are working, the moving blade impeller rotates, and the guide impeller does not move; The first motor is electrically connected to the impeller in the first-stage impeller axial flow fan and the impeller in the second-stage impeller axial flow fan, and is used to drive the impeller in the first-stage impeller axial flow fan and the impeller in the second-stage impeller axial flow fan to rotate, wherein the rotation speed of the impeller in the second-stage impeller axial flow fan is greater than the rotation speed of the impeller in the first-stage impeller axial flow fan; The fairing is located outside the first-stage moving blade axial flow fan and the second-stage moving blade axial flow fan; The Hall speed sensor is connected to the first-stage moving blade axial flow fan and the second-stage moving blade axial flow fan, and is used to measure the actual speed of the moving blade impeller in the first-stage moving blade axial flow fan and the moving blade impeller in the second-stage moving blade axial flow fan; The control box is electrically connected to the first motor and the Hall speed sensor, respectively, and is used to adjust the speed of the first motor according to the measurement value of the Hall speed sensor so that the actual speeds of the impellers in the first-stage impeller axial flow fan and the impellers in the second-stage impeller axial flow fan meet the preset speed requirements.

2. The range hood according to claim 1, characterized in that: The first motor is located above the second-stage moving blade axial flow fan; or, The first motor is located between the first-stage moving blade axial flow fan and the second-stage moving blade axial flow fan.

3. The range hood according to claim 1, characterized in that: The first motor includes: a primary motor and a secondary motor; The first-stage motor is located between the first-stage moving blade axial flow fan and the second-stage moving blade axial flow fan; The secondary motor is located above the secondary moving blade axial flow fan.

4. The range hood according to claim 1, characterized in that: Also includes: Three-stage moving blade axial fan, The three-stage moving blade axial flow fan is located above the two-stage moving blade axial flow fan; The first motor is also electrically connected to the impeller in the three-stage impeller axial flow fan, and is used to drive the impeller in the three-stage impeller axial flow fan to rotate, wherein the rotation speed of the impeller in the three-stage impeller axial flow fan is greater than the rotation speed of the impeller in the one-stage impeller axial flow fan. The fairing is also located outside the three-stage moving blade axial flow fan; The Hall speed sensor is also connected to the moving blade impeller in the three-stage moving blade axial flow fan, and is used to measure the actual speed of the moving blade impeller in the three-stage moving blade axial flow fan.

5. The range hood according to claim 4, characterized in that: The first motor is located between the first-stage moving blade axial flow fan and the second-stage moving blade axial flow fan.

6. The range hood according to claim 5, characterized in that: The first motor includes: a three-level motor and a four-level motor; The three-stage motor is located between the first-stage moving blade axial flow fan and the second-stage moving blade axial flow fan; The four-stage motor is located above the three-stage moving blade axial flow fan.

7. The range hood according to any one of claims 1 to 6, characterized in that: The moving blades are airfoil blades; the angle between the moving blades and the vertical direction is less than or equal to 40 degrees and greater than or equal to 25 degrees; the number of the moving blades is less than or equal to 18 and greater than or equal to 14.

8. The range hood according to any one of claims 1 to 6, characterized in that: The guide vane is in an arc shape, and the angle between the arc tangent of the outlet end of the guide vane and the frontal line is 90°. The number of the guide vanes is less than or equal to 14 and greater than or equal to 10; the sum of the angle between the inlet end of the guide vane and the vertical direction and the angle between the moving blade and the vertical direction is less than or equal to 90 degrees and greater than or equal to 80 degrees.

9. The range hood according to any one of claims 1 to 6, characterized in that: The first motor is a brushless DC motor.

10. The range hood according to claim 1, characterized in that: The side smoke shield comprises: Fixed part and board surface; The fixing part and the plate surface are connected via a rotating shaft, the fixing part is fixed on the outer shell of the smoking structure, and the plate surface can rotate around the rotating shaft.

11. The range hood according to claim 1, characterized in that: The smoking structure housing is also provided with: a second motor; The second motor is electrically connected to the side smoke baffle plate and is used to control the rotation of the side smoke baffle plate.

12. The range hood according to claim 1, characterized in that: The smoking structure shell is also provided with: a rotating support structure and a first support rod; the upper main unit also includes: a push rod motor, a connecting rod, and a second support rod; The push rod motor is located inside the main body housing, the movement direction of the push rod in the push rod motor is the direction of gravity, and the movable end of the push rod in the push rod motor is connected to one end of the connecting rod; One side of the rotating support structure is connected to the main smoke shield, and the other side of the rotating support structure is connected to the other end of the connecting rod; The control box is electrically connected to the push rod motor and is used to control the working state of the push rod motor; One end of the first support rod is connected to the smoking structure shell, the other end of the first support rod is hinged to one end of the second support rod, and the side wall of the second support rod is connected to the main smoke baffle plate, for supporting the main smoke baffle plate to be located at the current rotation position when the main smoke baffle plate rotates.

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