Common flue pressurizing equipment for range hoods, oil fume extraction device and control method

Abstract

The present disclosure relates to a common flue pressurization device for range hoods, a fume extraction device and a control method. The common flue pressurization device for range hoods comprises: a fan housing, and a first-stage moving blade axial flow fan, a second-stage moving blade axial flow fan, a motor, a fairing, a Hall speed sensor and a controller located inside the fan housing; the second-stage moving blade axial flow fan is located above the first-stage moving blade axial flow fan; the motor 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. By using the principle of multi-stage moving blade axial flow fan pressurization, the change of external resistance is sensed by the change of fan speed to adjust the wind pressure output of the fan to achieve the purpose of adapting to the external resistance, thereby improving the kitchen environment processing capacity.

Description

Technical Field

[0001] The present disclosure relates to the technical field of household appliances, and in particular to a common flue pressurizing device for range hoods, a fume extraction device and a control method. Background Art

[0002] At present, domestic urbanization is becoming more and more in-depth, and residents' housing is gradually developing towards high-rise buildings. Therefore, people have higher and higher requirements for the purification of oil fumes generated during cooking in the kitchen.

[0003] The common practice now is to install a range hood, but due to the public flue of high-rise residential buildings and the influence of external climate (for example, strong winds outside), the range hood is not sufficient to smoothly remove the kitchen fumes, resulting in a relatively poor kitchen environment. Summary of the invention

[0004] In order to overcome the problems existing in the related art, the embodiments of the present disclosure provide a common flue pressurizing device for range hoods, a fume extraction device and a control method. The technical solution is as follows:

[0005] According to a first aspect of an embodiment of the present disclosure, there is provided a range hood common flue pressurizing device, comprising:

[0006] A fan housing, and a first-stage moving blade axial flow fan, a second-stage moving blade axial flow fan, a motor, a fairing, a Hall speed sensor and a controller located inside the fan housing;

[0007] 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;

[0008] The 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;

[0009] The fairing is located outside the first-stage moving blade axial flow fan and the second-stage moving blade axial flow fan;

[0010] 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;

[0011] The controller is located inside the fan casing and 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 measurement value of the Hall speed sensor so that the actual speeds of the moving blade impellers in the first-stage moving blade axial flow fan and the moving blade impellers in the second-stage moving blade axial flow fan meet the preset speed requirements.

[0012] The embodiment of the present disclosure provides a common flue pressurizing device for range hoods, comprising: a fan housing, and a first-stage moving blade axial flow fan, a second-stage moving blade axial flow fan, a motor, a fairing, a Hall speed sensor and a controller located inside the fan housing; 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 are connected to each other.

[0013] The machine includes: 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:

[0014] The invention comprises: a plurality of guide blades arranged in the circumferential direction; when the first-stage moving blade axial flow fan and the second-stage moving blade axial flow fan are working, the moving blade impeller rotates and the guide impeller does not move; a 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, and a fairing is located at the first-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 controller is located inside the fan housing, and 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 measurement 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 multi-stage moving blade axial flow fan supercharging, the change of external resistance is sensed by the change of fan speed, so as to adjust the wind pressure output of the fan to achieve the purpose of adapting to external resistance, thereby improving the kitchen environment processing capacity.

[0015] In one embodiment,

[0016] The motor is located above the secondary moving blade axial flow fan;

[0017] or,

[0018] The 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 motor comprises: 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 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 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 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. In one embodiment,

[0033] The guide vane is in an arc shape, and the angle between the arc tangent at 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.

[0034] In one embodiment, the motor is a brushless DC motor.

[0035] According to a second aspect of an embodiment of the present disclosure, there is provided an oil fume extraction device, comprising:

[0036] A range hood, a common flue and a range hood common flue pressurizing device as described in any one of the above;

[0037] The air outlet of the range hood is connected to the entrance of the public flue;

[0038] The range hood common flue pressurizing device is located inside the common flue.

[0039] According to a third aspect of an embodiment of the present disclosure, a control method for a range hood common flue pressurization device is provided, comprising:

[0040] The actual rotation speeds of the impellers in the first-stage impeller axial flow fan and the impellers in the second-stage impeller axial flow fan are obtained by the Hall rotation speed sensor;

[0041] Obtaining a difference between a preset speed and the actual speed;

[0042] When the difference is greater than zero, increasing the rotation speed of the motor;

[0043] When the difference is less than zero, reducing the rotation speed of the motor;

[0044] When the difference is equal to zero, the rotation speed of the motor is not changed.

[0045] In one embodiment, when the motor includes a primary motor and a secondary motor, the method further includes:

[0046] When the difference is greater than zero, increasing the rotation speed of the secondary motor;

[0047] When the difference is less than zero, reducing the rotation speed of the secondary motor;

[0048] When the difference is equal to zero, the rotation speed of the secondary motor is not changed.

[0049] 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

[0050] 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.

[0051] Figure 1 It is a schematic structural diagram of a range hood common flue pressurization device according to an exemplary embodiment.

[0052] Figure 2 It is a schematic structural diagram of a range hood common flue pressurization device according to an exemplary embodiment.

[0053] Figure 3 It is a schematic structural diagram of a range hood common flue pressurization device according to an exemplary embodiment.

[0054] Figure 4 It is a schematic structural diagram of a range hood common flue pressurization device according to an exemplary embodiment.

[0055] Figure 5 It is a schematic structural diagram of a range hood common flue pressurization device according to an exemplary embodiment.

[0056] Figure 6 It is a schematic structural diagram of a range hood common flue pressurization device according to an exemplary embodiment.

[0057] Figure 7 It is a flow chart of a control method of a range hood common flue pressurization device according to an exemplary embodiment. DETAILED DESCRIPTION

[0058] 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.

[0059] Figure 1 FIG. 1 is a schematic structural diagram of a common flue pressurizing device for range hoods according to an exemplary embodiment. Figure 1 As shown, including:

[0060] The fan housing 1, and the first-stage moving blade axial flow fan 2, the second-stage moving blade axial flow fan 3, and the electric

[0061] The machine 4, the fairing 5, the Hall speed sensor 6 and the controller (not shown in the figure);

[0062] The second-stage moving blade axial flow fan 3 is located above the first-stage moving blade axial flow fan 2. Both the first-stage moving blade axial flow fan 2 and the second-stage moving blade axial flow fan 3 include: a moving blade impeller and a guide impeller; the moving blade impeller includes: a plurality of moving blades (21, 31) arranged along the circumferential direction; the guide impeller includes: a plurality of guide blades (22, 32) arranged along the circumferential direction; when the first-stage moving blade axial flow fan 2 and the second-stage moving blade axial flow fan 3 are working, the moving blade impeller rotates and the guide impeller does not move;

[0063] a motor 4, electrically connected to the moving blade impeller in the first-stage moving blade axial flow fan 2 and the moving blade impeller in the second-stage moving blade axial flow fan 3, and used to drive the moving blade impeller in the first-stage moving blade axial flow fan 2 and the moving blade impeller in the second-stage moving blade axial flow fan 3 to rotate, wherein the rotating speed of the moving blade impeller in the second-stage moving blade axial flow fan 3 is greater than the rotating speed of the moving blade impeller in the first-stage moving blade axial flow fan 2;

[0064] A fairing 5 is located outside the first-stage moving blade axial flow fan 2 and the second-stage moving blade axial flow fan 3;

[0065] A Hall speed sensor 6 is connected to the first-stage moving blade axial flow fan 2 and the second-stage moving blade axial flow fan 3, and is used to measure the actual speed of the moving blade impeller in the first-stage moving blade axial flow fan 2 and the moving blade impeller in the second-stage moving blade axial flow fan 3;

[0066] The controller is located inside the fan housing 1 and is electrically connected to the motor 4 and the Hall speed sensor 6 respectively, and is used to adjust the speed of the motor 4 according to the measurement value of the Hall speed sensor 6 so that the actual speeds of the moving blade impellers in the first-stage moving blade axial flow fan 2 and the moving blade impellers in the second-stage moving blade axial flow fan 3 meet the preset speed requirements.

[0067] 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 kitchen environment processing capacity.

[0068] Specifically, the present disclosure includes a first-stage moving blade axial flow fan 2 and a second-stage moving blade axial flow fan 3. When the first-stage moving blade axial flow fan 2 and the second-stage moving blade axial flow fan 3 are working, the moving blade impellers rotate, the guide impellers remain stationary, and the rotation speed of the moving blade impellers in the second-stage moving blade axial flow fan 3 is greater than the rotation speed of the moving blade impellers in the first-stage moving blade axial flow fan 2. In the present disclosure, the second-stage moving blade axial flow fan 3 is used to adjust the air volume and air pressure to achieve a boosting effect.

[0069] Among them, the Hall speed sensor 6, the first-stage moving blade axial flow fan 2, the second-stage moving blade axial flow fan 3 and the controller constitute a PID precise control system to adapt to the changes in external wind pressure resistance. ,whenWhen the external wind pressure resistance changes, the fan speed also changes accordingly. During adjustment, it is assumed that the speed design value of the moving blade impeller in the first-stage moving blade axial flow fan 2 and the moving blade impeller in the second-stage moving blade axial flow fan 3 is a preset speed, that is, during operation, the Hall speed sensor 6 is required to measure the actual speed of the moving blade impeller in the first-stage moving blade axial flow fan 2 and the moving blade impeller in the second-stage moving blade axial flow fan 3 as the above-mentioned preset speed. If the difference between the preset speed and the actual speed of the moving blade impeller in the first-stage moving blade axial flow fan 2 and the moving blade impeller in the second-stage moving blade axial flow fan 3 obtained by the Hall speed sensor 6 is greater than zero, it is necessary to increase the speed of the motor 4. When the difference is less than zero, reduce the speed of the motor 4 so that the actual speed of the moving blade impeller in the first-stage moving blade axial flow fan 2 and the moving blade impeller in the second-stage moving blade axial flow fan 3 is the above-mentioned preset speed.

[0070] Before that, the relationship curves φQ and φp between the air volume Q, wind pressure P and the actual rotation speeds of the impellers in the first-stage impeller axial flow fan 2 and the second-stage impeller axial flow fan 3 can be measured in advance after the range hood common flue booster equipment is installed in the common flue.

[0071] The embodiment of the present disclosure provides a common flue pressurizing device for range hoods, comprising: a fan housing, and a first-stage moving blade axial flow fan, a second-stage moving blade axial flow fan, a motor, a fairing, a Hall speed sensor and a controller located inside the fan housing; 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 blades arranged in a circumferential direction; the guide impeller comprises: a plurality of guide blades arranged in a circumferential direction; when the first-stage moving blade axial flow fan and the second-stage moving blade axial flow fan are working, the moving blade impeller rotates and the guide impeller does not move; the motor is coupled 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

[0072] The impeller of the first-stage impeller axial flow fan and the impeller of the second-stage impeller axial flow fan are electrically connected, and are used to drive the impeller of the first-stage impeller axial flow fan and the impeller of the second-stage impeller axial flow fan to rotate, wherein the rotation speed of the impeller of the second-stage impeller axial flow fan is greater than the rotation speed of the impeller of the first-stage impeller axial flow fan; the fairing is located outside the first-stage impeller axial flow fan and the second-stage impeller axial flow fan; the Hall speed sensor is connected to the first-stage impeller axial flow fan and the second-stage impeller axial flow fan, and is used to measure the actual rotation speed of the impeller of the first-stage impeller axial flow fan and the impeller of the second-stage impeller axial flow fan; the controller is located inside the fan casing, and is electrically connected to the motor and the Hall speed sensor respectively, and is used to adjust the rotation speed of the motor according to the measurement value of the Hall speed sensor, so that the actual rotation speed of the impeller of the first-stage impeller axial flow fan and the impeller of the second-stage impeller axial flow fan meets the preset speed requirement. Among them, the principle of multi-stage moving blade axial flow fan boosting is adopted, and the change of external resistance is sensed by the change of fan speed, so as to adjust the fan's wind pressure output to adapt to the external resistance and improve the kitchen environment processing capacity.

[0073] In one embodiment, Figure 1 As shown, the motor 4 is located above the two-stage moving blade axial flow fan 3.

[0074] In another embodiment, Figure 2 As shown, the motor 4 is located between the first-stage moving blade axial flow fan 2 and the second-stage moving blade axial flow fan 3 .

[0075] In one embodiment, in order to improve the boost effect, Figure 3 As shown, the motor 4 includes: a primary motor 41 and a secondary motor 42;

[0076] The first-stage motor 41 is located between the first-stage moving blade axial flow fan 2 and the second-stage moving blade axial flow fan 3;

[0077] The secondary motor 42 is located above the secondary moving blade axial flow fan 3 .

[0078] In this embodiment, the first-stage moving blade axial flow fan 2 is driven by a first-stage motor 41 , and the second-stage moving blade axial flow fan 3 is driven by a second-stage motor 42 .

[0079] In one embodiment, Figure 4 As shown, in order to achieve a better supercharging effect, it also includes: a three-stage moving blade axial flow fan 7 (the three-stage moving blade axial flow fan 7 has a similar structure to the first-stage moving blade axial flow fan 2 and the second-stage moving blade axial flow fan 3, and also includes: a moving blade impeller and a guide impeller; the moving blade impeller includes: a plurality of moving blades (71) arranged along the circumferential direction; the guide impeller includes: a plurality of guide blades (72) arranged along the circumferential direction);

[0080] The third-stage moving blade axial flow fan 7 is located above the second-stage moving blade axial flow fan 3;

[0081] The motor 4 is also electrically connected to the moving blade impeller in the three-stage moving blade axial flow fan 7, and is used to drive the moving blade impeller in the three-stage moving blade axial flow fan 7 to rotate, wherein the speed of the moving blade impeller in the three-stage moving blade axial flow fan 7 is greater than the speed of the moving blade impeller in the first-stage moving blade axial flow fan 2.

[0082] The fairing 5 is also located outside the three-stage moving blade axial flow fan 7;

[0083] The Hall speed sensor 6 is also connected to the moving blade impeller in the three-stage moving blade axial flow fan 7 and is used to measure the actual speed of the moving blade impeller in the three-stage moving blade axial flow fan 7 .

[0084] By jointly adjusting the air volume and air pressure by the second-stage moving blade axial flow fan 3 and the third-stage moving blade axial flow fan 7, the supercharging effect can be improved.

[0085] In one embodiment, Figure 4 As shown, the motor 4 is located between the first-stage moving blade axial flow fan 2 and the second-stage moving blade axial flow fan 3 .

[0086] In one embodiment, Figure 5 As shown, the motor 4 includes: a three-pole motor 43 and a four-pole motor 44;

[0087] The third-stage motor 43 is located between the first-stage moving blade axial flow fan 2 and the second-stage moving blade axial flow fan 3;

[0088] The four-stage motor 44 is located above the three-stage moving blade axial flow fan 7 .

[0089] In this embodiment, the first-stage moving blade axial flow fan 2 is driven by a three-stage motor 43 , and the second-stage moving blade axial flow fan 3 and the third-stage moving blade axial flow fan 7 are driven by a four-stage motor 44 .

[0090] In the above embodiments, the moving blade is an airfoil blade; the angle between the moving blade and the vertical direction (can also be

[0091] 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.

[0092] For example, the moving blades may adopt NACA0010 airfoil, with an installation angle of 30° and 16 moving blades.

[0093] In the above embodiments, the guide vane is in an arc shape, the angle between the arc tangent of the outlet end of the guide vane and the frontal line is 90 degrees, 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 (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.

[0094] For example, the guide vane is in an arc shape, the arc diameter is about 240 mm, the installation angle at the inlet end is 50°, the angle between the arc tangent and the frontal line at the outlet end is 90°, and the number of the guide vanes is 12.

[0095] In one embodiment, the motor 4 is a brushless DC motor 4 for adjusting the rotation speed of each fan.

[0096] Figure 6 is a schematic diagram of the structure of a fume extraction device according to an exemplary embodiment. Figure 6 As shown, including:

[0097] Range hood 8, public flue 9 and range hood public flue pressurization equipment;

[0098] The air outlet of the range hood 8 is connected to the entrance of the public flue 9;

[0099] The range hood common flue pressurizing device is located inside the common flue 9 .

[0100] Figure 7 A control method for a range hood common flue pressurization device according to an exemplary embodiment is shown, such as Figure 7 As shown, the method includes the following sub-steps:

[0101] In step S101, the actual rotation speeds of the impellers in the first-stage impeller axial flow fan and the impellers in the second-stage impeller axial flow fan are obtained through the Hall speed sensor;

[0102] In step S102, the difference between the preset speed and the actual speed is obtained;

[0103] In step S103, when the difference is greater than zero, the speed of the motor is increased;

[0104] In step S104, when the difference is less than zero, the speed of the motor is reduced;

[0105] In step S105 , when the difference is equal to zero, the rotation speed of the motor is not changed.

[0106] In one embodiment, when the motor includes a primary motor and a secondary motor, the method further includes:

[0107] When the difference is greater than zero, the speed of the secondary motor is increased;

[0108] When the difference is less than zero, the speed of the secondary motor is reduced;

[0109] When the difference is equal to zero, the speed of the secondary motor does not change.

[0110] The structure and working process of the common flue pressurization device for range hoods disclosed in the present invention are described in detail below.

[0111] The common flue pressurizing device of the range hood adopts a multi-stage moving blade axial flow fan, which can be a two-stage moving blade axial flow fan (including: a first-stage moving blade axial flow fan 2 and a second-stage moving blade axial flow fan 3) and a three-stage moving blade axial flow fan 7 (including: a first-stage moving blade axial flow fan 2, a second-stage moving blade axial flow fan 3 and a third-stage moving blade axial flow fan 7). The moving blades in the moving blade axial flow fans at each stage adopt NACA0010 airfoil, the installation angle is 30 degrees, and the number of blades is 16; the guide blades in the moving blade axial flow fans at each stage are arc-shaped, the arc diameter is about 240 mm, the installation angle at the inlet end is 50 degrees, and the angle between the arc tangent line and the frontal line at the outlet end is 90 degrees. , the number of blades is 12; a Hall speed sensor 6 is also installed on the fan to measure the fan speed (that is, to measure the actual speed of the moving blade impeller in the first-stage moving blade axial flow fan 2, the moving blade impeller in the second-stage moving blade axial flow fan 3 and the third-stage moving blade axial flow fan 7), and the motor 4 adopts a DC brushless motor 4 to adjust the speed of the fan; when the moving blade axial flow fans of each stage 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 of each stage is the same.

[0112] Further, in the two-stage moving blade axial flow fan 3, there is a (such as Figure 1 As shown), b(as shown Figure 2 As shown), c(as Figure 3

[0113] Three models:

[0114] 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 2 is called a primary moving blade, and the guide blade in the primary moving blade axial flow fan 2 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 3 is called a secondary moving blade, and the guide blade in the secondary moving blade axial flow fan 3 is called a secondary guide blade), a motor 4, a fairing 5, a fan housing 1 and a Hall speed sensor 6; the motor 4 can be installed on the top of the secondary moving blade axial flow fan 3 to drive the primary moving blade and the secondary moving blade to rotate; the Hall speed sensor 6 is used to measure the speed of the primary moving blade axial flow fan 2 and the secondary moving blade axial flow fan 3;

[0115] The composition of model b is the same as that of model a, the main difference being that the motor 4 is installed between the first-stage moving blade axial flow fan 2 and the second-stage moving blade axial flow fan 3;

[0116] Model c has one more motor 4 than model a (including: a primary motor 41 and a secondary motor 42), the primary moving blades are driven by the primary motor 41, the secondary moving blades are driven by the secondary motor 42, and the rotation speed of the secondary moving blades is greater than or equal to the rotation speed of the primary moving blades;

[0117] Further, the three-stage moving blade axial flow fan 7 has c (such as Figure 4 As shown), d(as Figure 5 Two models:

[0118] 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 blade, a tertiary guide blade (the moving blade blades in the three-stage moving blade axial flow fan 7 are called tertiary moving blade blades, and the guide blades in the three-stage moving blade axial flow fan 7 are called tertiary guide blades), a motor 4, a fairing 5, a fan housing 1 and a Hall speed sensor 6; the moving blade blades in the moving blade axial flow fans at all levels are driven by the motor 4; the Hall speed sensor 6 is used to measure the fan speed;

[0119] Model d has one more motor 4 (including: a three-stage motor 43 and a four-stage motor 44) on the basis of model c. The four-stage motor 44 is installed above the three-stage moving blade axial flow fan 7, and the three-stage motor 43 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 43, and the third-stage moving blades are driven by the four-stage motor 44. The other is that the first-stage moving blades are driven by the three-stage motor 43, and the second-stage moving blades and the third-stage moving blades are driven by the four-stage motor 44. The rotating speed of the moving blades driven by the four-stage motor 44 is greater than that of the moving blades driven by the three-stage motor 43.

[0120] Further, when there is only one motor 4, the speed ω1 of the fan has a value range of (1500, 3000). After the fan is installed in the smoke exhaust fan, the relationship curves φQ and φp between the air volume Q, the wind pressure P and the speed ω1 are measured respectively; when there are two motors 4, the speed ω1 of the first-level motor 41\third-level motor 43 has a value range of (1500, 2000), and the speed ω2 of the second-level motor 42\fourth-level motor 44 has a value range of (2000, 3000). The second-level motor 42\fourth-level motor 44 is used to adjust the air volume and wind pressure. After the fan is installed in the smoke exhaust fan, the relationship curves φQ and φp between the air volume Q, the wind pressure P and the speed ω2 are measured respectively;

[0121] Furthermore, the Hall speed sensor 6, the fan, and the controller form a PID precise 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:

[0122] For a model with only one motor 4, the design value of the motor 4 speed is assumed to be ω0; the measured value of the Hall speed sensor 6 is ωc; the difference between the design value and the measured value is Δω=ω0-ωc: when Δω>0, the speed ω1 is increased; when Δω<0, the speed ω1 is decreased; when Δω=0, the speed is not adjusted;

[0123] For the model with two-stage motor 4, the design value of motor 4 speed is ω0; the measured value of Hall speed sensor 6 is ωc; the difference between the design value and the measured value is Δω=ω0-ωc: when Δω>0, the speed ω2 is increased; when Δω<0, the speed ω2 is decreased; when Δω=0, the speed is not adjusted;

[0124] Implementation scheme of the present invention: This patent adopts 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 wind pressure output, thereby achieving the purpose of responding to external resistance and improving the kitchen environment processing capacity.

[0125] 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.

[0126] 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 common flue pressurization device, characterized in that: include: A fan housing, and a first-stage moving blade axial flow fan, a second-stage moving blade axial flow fan, a motor, a fairing, a Hall speed sensor and a controller located inside the fan housing; 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 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 controller is located inside the fan housing and 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 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; The motor is located above the secondary moving blade axial flow fan; or, The motor is located between the first-stage moving blade axial flow fan and the second-stage moving blade axial flow fan; The motor comprises: 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 second-stage motor is located above the second-stage moving blade axial flow fan; Also includes: three-stage moving blade axial flow fan, The three-stage moving blade axial flow fan is located above the two-stage moving blade axial flow fan; The 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.

2. The range hood common flue pressurization device according to claim 1, characterized in that: The 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 common flue pressurization device according to claim 2, characterized in that: The motors include: a three-stage motor and a four-stage 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.

4. The range hood common flue pressurization device according to any one of claims 1 to 3, 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.

5. The range hood common flue pressurization device according to any one of claims 1 to 3, characterized in that: The guide vane is in an arc shape, and the angle between the arc tangent at 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.

6. The range hood common flue pressurization device according to any one of claims 1 to 3, characterized in that: The motor is a brushless DC motor.

7. A fume extraction device, characterized in that: include: A range hood, a common flue and a range hood common flue pressurizing device as claimed in any one of claims 1 to 6; The air outlet of the range hood is connected to the entrance of the public flue; The range hood common flue pressurizing device is located inside the common flue.

8. A control method for a common flue pressurization device for a range hood, using the range hood according to any one of claims 1 to 6 Public flue pressurization equipment, characterized in that: include: The actual rotation speeds of the impellers in the first-stage impeller axial flow fan and the impellers in the second-stage impeller axial flow fan are obtained by the Hall rotation speed sensor; Obtaining a difference between a preset speed and the actual speed; When the difference is greater than zero, increasing the rotation speed of the motor; When the difference is less than zero, reducing the rotation speed of the motor; When the difference is equal to zero, the rotation speed of the motor is not changed.

9. The method according to claim 8, characterized in that When the motor includes a primary motor and a secondary motor, the method further includes: When the difference is greater than zero, increasing the rotation speed of the secondary motor; When the difference is less than zero, reducing the rotation speed of the secondary motor; When the difference is equal to zero, the rotation speed of the secondary motor is not changed.

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