CN117090790A - Fan, range hood with fan and fan rotating speed control method - Google Patents
Fan, range hood with fan and fan rotating speed control method Download PDFInfo
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- CN117090790A CN117090790A CN202311117792.6A CN202311117792A CN117090790A CN 117090790 A CN117090790 A CN 117090790A CN 202311117792 A CN202311117792 A CN 202311117792A CN 117090790 A CN117090790 A CN 117090790A
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- impeller
- fan
- pressure sensor
- driving
- pressure
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 47
- 238000004804 winding Methods 0.000 claims description 33
- 239000012530 fluid Substances 0.000 claims description 29
- 230000001965 increasing effect Effects 0.000 claims description 16
- 239000000779 smoke Substances 0.000 abstract description 15
- 238000007599 discharging Methods 0.000 abstract description 4
- 238000009434 installation Methods 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000033001 locomotion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D19/00—Axial-flow pumps
- F04D19/002—Axial flow fans
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The application relates to the technical field of fan machinery, in particular to a fan, a range hood with the fan and a fan rotating speed control method, which comprise the following steps: a housing having an inlet and an outlet; a first impeller and a second impeller disposed within the housing, the first impeller coincident with a rotational axis of the second impeller; the back pressure detection device is arranged in the shell and is used for detecting the pressure at the outlet; and the driving device comprises a first driving part for driving the first impeller to rotate in a first preset direction and a second driving part connected with the second impeller, and according to the detection result of the back pressure detection device, the second driving part can drive the second impeller to rotate in a direction opposite to the first preset direction at different rotation speeds. The fan can adjust the rotating speed of the second impeller according to the change of the smoke discharging resistance, so that the air quantity of the fan is stable.
Description
Technical Field
The application relates to the technical field of fan machinery, in particular to a fan, a range hood with the fan and a fan rotating speed control method.
Background
The fan is an important part in the range hood, sucks the oil smoke into the range hood by utilizing the fluid dynamics principle, and discharges the oil smoke to the public smoke pipe and other positions in a directional manner, so that the purification work of kitchen air is completed.
The axial flow fan, the diagonal flow fan, the mixed flow fan and the like are all fan types commonly used in the range hood, and the same characteristics of the fan are that: there is a flow of fluid within the fan in the direction of the fan axis. In order to overcome the smoke discharging resistance of the public smoke pipe, the static pressure of the discharged fluid of the fan is generally required to be raised by a proper means before the smoke is discharged. Thus, two types of impellers are often included in such fans: a rotating impeller and stationary vanes for elevating static pressure.
However, in actual use, the range hood using the fan often has unstable feedback smoke discharging effect, and frequently has the problem of insufficient smoke discharging caused by too small air quantity.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a fan capable of stabilizing the air volume of the fan by adjusting the rotation speed of the second impeller in accordance with the change in the smoke exhaust resistance, a range hood having the same, and a fan rotation speed control method.
The present application first provides a fan including:
a housing having an inlet and an outlet;
a first impeller and a second impeller which are sequentially arranged in the shell along the direction from the inlet to the outlet, wherein the rotation axes of the first impeller and the second impeller are coincident;
the back pressure detection device is arranged in the shell and is used for detecting the pressure at the outlet; the method comprises the steps of,
the driving device comprises a first driving part and a second driving part, wherein the first driving part is used for driving the first impeller to rotate in a first preset direction, the second driving part is connected with the second impeller, and according to the detection result of the back pressure detection device, the second driving part can drive the second impeller to rotate in a direction opposite to the first preset direction at different rotation speeds.
In the fan, the second impeller can rotate in opposite directions relative to the first impeller, the detection result detected by the back pressure detection device can feed back the back pressure of the air flow discharge environment of the fan, and when the back pressure changes, the air quantity is adjusted by adjusting the rotating speed of the second impeller, so that the fan can be better adapted to different working conditions and basically stable output air quantity can be maintained. For example, when the pressure at the outlet is detected to be increased, the second impeller can perform secondary work on the fluid flowing through the second impeller by properly increasing the rotating speed of the second impeller, so that the kinetic energy of the fluid is kept free from being blocked by the high pressure at the outlet, and meanwhile, the second impeller can perform a diffusion effect to a certain extent, so that the flow of the outlet output airflow is relatively stable under the condition of high resistance. When the back pressure detection device detects that the back pressure of the environment is smaller, the second impeller can be kept in a static state or rotate at a lower rotating speed, so that the second impeller only plays a certain diffusion role, and the fan is kept in a working state with large air quantity and high efficiency.
In one embodiment, the back pressure detection device includes a first pressure sensor and a second pressure sensor, the first pressure sensor and the second pressure sensor being respectively disposed at different locations of the flow area within the housing; the air volume Q at the outlet is calculated according to the following formula:
wherein: s is S 1 A flow area of the housing at a location of the first pressure sensor;
S 2 a flow area of the housing at a location of the second pressure sensor;
P 1 for the first pressureA pressure measured by the sensor;
P 2 a pressure measured for the second pressure sensor;
ρ is the density of the fluid;
the calculated air quantity Q and a preset air quantity value Q 0 Comparing when Q 0 When Q is higher than the first value, the rotation speed of the second impeller is increased through the second driving part; when Q is 0 When Q is less than the value, the rotation speed of the second impeller is reduced through the second driving part; when Q is 0 When=q, the current stationary state or current rotational speed of the second impeller is maintained.
By arranging the first pressure sensor and the second pressure sensor at different positions of the flow area in the shell, the pressure values at two different positions in the shell can be obtained, the flow area of the shell where the two sensors are positioned can be combined with the known flow area of the shell where the two sensors are positioned, the air quantity Q at the current outlet can be accurately estimated according to the four parameter values, and the air quantity Q is compared with the preset air quantity Q 0 And comparing, wherein the comparison result can accurately reflect the difference between the actual working condition and the preset condition of the fan, and the rotating speed of the second impeller is adjusted according to the difference, so that the adjustment result is more accurate.
In one embodiment, the driving device comprises a first rotor and a second rotor which are respectively used as a first driving part and a second driving part, and a first winding and a second winding which respectively correspond to the first rotor and the second rotor, wherein the first winding and the second winding can generate magnetic fields in different directions under the driving of a first current and a second current with different application directions so as to drive the first rotor and the second rotor to rotate in different directions; and when Q 0 Increasing the second current at > Q such that the rotational speed of the second impeller increases; when Q is 0 When Q is less than the value, the second current is reduced so that the rotating speed of the second impeller is reduced; when Q is 0 When=q, the second current is kept unchanged.
The structure of the driving device is equivalent to that of a double-driving motor, and the two rotors of the motor output rotary motions relatively independently, so that the installation of the driving device can be simplified, the installation space required by the driving device in a fan is reduced, and meanwhile, other structural members of the motor except for the two rotors and the two windings can share one group, so that compared with the driving device which independently uses the two motors to drive the first impeller and the second impeller to rotate respectively, the cost of the driving device in the application is greatly reduced.
In one embodiment, the driving device is arranged in the shell, and the first winding and the second winding are arranged at intervals along the direction from the inlet to the outlet; the first rotor comprises a first main body part arranged in a region surrounded by the first winding, and a first rotating shaft which extends out of the first main body part in a direction opposite to the second rotor and is used for driving the first impeller to rotate; the second rotor comprises a second main body part arranged in a region surrounded by the second winding, and a second rotating shaft which extends out of the second main body part in the direction of the first rotor and is used for driving the second impeller to rotate.
The first rotating shaft and the second rotating shaft extend away from each other, so that the driving device can be selectively arranged at a position between the two impellers in the shell, and the installation space required by the driving device in the fan can be further reduced.
In one embodiment, the fan further includes a control device, the control device is electrically connected with the back pressure detection device and the driving device, and the control device can calculate the air volume Q according to the detection result of the back pressure detection device, and calculate the air volume Q according to the air volume Q and a preset air volume value Q 0 And adjusting the magnitude of the second current.
The second current is adjusted through the control device, so that the rotating speed of the second impeller is matched with the detection result of the back pressure detection device, and the air output of the fan can be adjusted and controlled more accurately and rapidly.
In one embodiment, the control device has at least two different preset winds pre-stored thereinMagnitude Q 0 。
So arranged, the fan can have a plurality of preset gears, and each gear corresponds to a pre-stored preset air quantity value Q 0 The accurate regulation and control of the output air quantity of each preset gear can be realized, and the integral quality of the fan is ensured.
In one embodiment, the first impeller and the second impeller are counter-rotating with respect to each other.
By the arrangement, the flowing direction of the air flow passing through the first impeller is approximately the same as the rotation direction of the second impeller, and thus energy loss caused by the impact of the air flow on the second impeller can be reduced.
The second aspect of the application also provides a range hood, which comprises the fan in any embodiment.
The third aspect of the present application also provides a fan rotation speed control method, which is applied to the fan in any one of the above embodiments, and the rotation speed control method includes the following steps:
the first impeller is driven to rotate in a first preset direction by a first driving part of the driving device;
the second impeller is driven to rotate in the direction opposite to the first preset direction by a second driving part of the driving device or kept stationary;
detecting the pressure at the outlet of the fan through a back pressure detection device;
calculating the air quantity Q at the outlet according to the pressure detected by the back pressure detection device;
the air quantity Q is compared with a preset air quantity value Q 0 Comparing;
when Q is 0 When Q is higher than the first value, the rotation speed of the second impeller is increased through the second driving part; when Q is 0 When Q is less than the value, the rotation speed of the second impeller is reduced through the second driving part; when Q is 0 When=q, the current stationary state or current rotational speed of the second impeller is maintained.
In one embodiment, upon pressure detection of the outlet:
detecting corresponding pressure values P1 and P2 of two positions with different flow areas in the shell through a first pressure sensor and a second pressure sensor;
the density rho of the fluid and the flow area S of the shell at the position of the first pressure sensor 1 Flow area S of the housing at the location of the second pressure sensor 2 The pressure value P1 detected by the first pressure sensor and the pressure value P2 detected by the second pressure sensor are brought into a formulaAnd calculating the air quantity Q.
Drawings
FIG. 1 is a schematic view of a blower according to an embodiment of the application;
FIG. 2 is a schematic view of a blower with a housing removed and a back pressure detection device according to an embodiment of the present application;
fig. 3 is a half cross-sectional view of the structure shown in fig. 2.
Reference numerals: 1. a housing; 11. an inlet; 12. an outlet; 2. a first impeller; 3. a second impeller; 4. a driving device; 41. a first rotor; 411. a first body portion; 412. a first rotating shaft; 42. a second rotor; 421. a second body portion; 422. a second rotating shaft; 43. a first winding; 44. a second winding; 5. a first pressure sensor; 6. and a second pressure sensor.
Detailed Description
In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.
In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Referring to fig. 1 to 3, fig. 1 is a schematic structural view of a fan according to an embodiment of the present application, fig. 2 is a schematic structural view of the fan shown in fig. 1 with the casing 1 and the back pressure detecting device removed, fig. 3 is a schematic structural view of the fan shown in fig. 2 with the rotation direction of the blades on the first impeller 2 and the second impeller 3 partially cut away, and fig. 3 is a schematic structural view of the fan shown in fig. 2 with the structure of the driving device 4 and the arrangement positions thereof relative to the two impellers.
The fan provided by the embodiment of the application comprises a shell 1, a first impeller 2, a second impeller 3, a driving device 4 and a back pressure detection device, wherein: the housing 1 has an inlet 11 and an outlet 12, the main flow direction of the fluid within the housing 1 being the direction from the inlet 11 to the outlet 12.
Along the direction from the inlet 11 to the outlet 12, the first impeller 2 and the second impeller 3 are sequentially arranged in the shell 1, the rotation axes of the first impeller 2 and the second impeller 3 are coincident, and the first impeller 2 and the second impeller 3 are arranged at a preset distance to avoid mutual interference when rotating. In other words, the second impeller 3 is disposed downstream of the first impeller 2, and the fluid first enters the casing 1 under the driving of the first impeller 2, flows through the second impeller 3, and then flows out from the outlet 12.
The back pressure detection means is provided in the housing 1 and is used to detect the pressure at the outlet 12. Taking a fan for use in a range hood as an example, the pressure at the outlet 12 is close to the exhaust pressure of the fan. In other use environments, the backpressure detection device reflects the ambient backpressure of the blower in the outward direction of the fluid being discharged.
The driving device 4 includes a first driving section and a second driving section, wherein: the first driving part is used for driving the first impeller 2 to rotate towards a first preset direction, so that the fluid inlet 11 is brought into the shell 1.
The second driving part is connected to the second impeller 3 and can drive the second impeller 3 to rotate in a direction opposite to the first preset direction. The output rotation speed of the second driving unit is determined based on the detection result of the back pressure detection device: when the back pressure detection device detects that the environmental back pressure of the fluid discharged from the outlet 12 is large, in order to enable the discharge flow to overcome large resistance, the second driving part drives the second impeller 3 to rotate at a high speed, so that the fluid flowing to the second impeller 3 performs secondary work, the kinetic energy of the fluid is increased at the position, the air output by the outlet 12 is stabilized, and the phenomenon that part of the fluid cannot be discharged due to insufficient kinetic energy caused by large resistance is avoided. At the same time, the second impeller 3 itself can act as a diffuser.
When the back pressure detection device detects that the environmental back pressure of the fluid discharged from the outlet 12 is smaller, the kinetic energy given to the first impeller 2 by rotation is enough to meet the requirement of smooth discharge, at the moment, the second impeller 3 can be kept in a low-speed or even static state, and at the moment, the second impeller 3 can mainly play a role of diffusion like a stationary blade in a common fan.
Taking a fan used in a range hood as an example, generally, when the smoke exhaust effect is poor, possible reasons include that the rotating of a movable blade in the fan is not smooth due to accumulation of oil dirt, or that other components in the range hood enable smoke to be sucked and exhausted smoothly. Even if the amount of smoke discharged is thought to be insufficient due to excessive smoke discharge resistance, the common solution is also aimed at one side of the public smoke pipe or the fan with higher power is replaced. However, in the present application, the second impeller 3 is rotated at a proper speed by the second driving part in the driving device 4, so that the second impeller 3 can perform the secondary work on the fluid while maintaining the diffusion function of the stator blade in the existing fan, and the fluid is accelerated secondarily in the casing 1, wherein: the degree of control of the second acceleration depends on the detection result of the back pressure detection means. Thus, the blower of the present application can maintain a relatively constant air volume at the outlet 12 regardless of the magnitude of the ambient back pressure.
In order to make the adjustment of the rotation speed of the second impeller 3 more accurate, in one embodiment, the back pressure detecting means includes a first pressure sensor 5 and a second pressure sensor 6, and the first pressure sensor 5 and the second pressure sensor 6 are respectively disposed at two positions different in flow area inside the casing 1. Thus, the position where the first pressure sensor 5 is provided is marked with a flow area S in the housing 1 1 And the second pressure sensor 6 is disposed at a position where the flow area of the housing 1 is S 2 。
Further assuming that the fluid flowing in the housing 1 is incompressible, the air volume flowing through the first pressure sensor 5 and the second pressure sensor 6 is the same, the following formula can be obtained according to bernoulli's equation:
wherein: s is S 1 A flow area at the location of the first pressure sensor 5;
S 2 a flow area at the location of the second pressure sensor 6;
P 1 for the pressure measured by the first pressure sensor 5;
P 2 for the pressure measured by the second pressure sensor 6;
ρ is the density of the fluid, which is a constant;
V 1 is the flow rate of the fluid at the location of the first pressure sensor 5;
V 2 is the flow rate of the fluid at the location of the second pressure sensor 6;
q is the air volume at the outlet 12 calculated from the detection result of the back pressure detection device.
According to the formula, conversion can be obtained
The preset air quantity value of the fan is Q 0 This value is the standard air volume value that the fan should reach. The calculated air quantity Q and Q 0 Comparison is performed: when Q is 0 When Q is higher than the preset value, the air output by the fan is lower than the expected value, and the rotating speed of the second impeller 3 is increased by the second driving part, so that the second impeller 3 performs secondary work on the fluid, and the air quantity Q approaches to and finally reaches the preset air quantity value Q 0 The method comprises the steps of carrying out a first treatment on the surface of the When Q is 0 When the air quantity is less than Q, the air quantity output by the fan exceeds the expected air quantity, and the rotating speed of the second impeller 3 is reduced through the second driving part; and when Q 0 When=q, the current stationary state or the current rotational speed of the second impeller 3 is maintained.
It will be appreciated that the pressure detection at the outlet 12 by the back pressure detection device is used to estimate the ambient back pressure, and the rotation speed of the second impeller 3 is adjusted according to the detection result, so as to solve the problem of unstable air volume, but the more accurate air volume Q is calculated in the above manner, and then the air volume Q is calculated according to the air volume Q and the preset air volume value Q 0 By comparing, a specific difference value can be obtained, and the rotation speed of the second impeller 3 can be adjusted according to the difference value, so that the adjustment can be more accurate.
As shown in fig. 3, in one embodiment, the driving device 4 includes a first rotor 41, a second rotor 42, a first winding 43, and a second winding 44 disposed within the housing 1, wherein: the first winding 43 is spaced apart from the second winding 44 in the direction of the inlet 11 to the outlet 12.
The first rotor 41 may serve as a first driving part for driving the first impeller 2 to rotate, and the second rotor 42 may serve as a second driving part for driving the second impeller 3 to rotate. The first winding 43 and the second winding 44 are similar to stator coils in a motor, and after current is introduced into the first winding 43 and the second winding 44, a magnetic field in a certain direction can be generated, so that first current and second current in different directions are respectively introduced into the first winding 43 and the second winding 44, and two magnetic fields in opposite directions can be generated.
The first rotor 41 and the second rotor 42 correspond to the first winding 43 and the second winding 44, respectively, the first rotor 41 includes a first body portion 411 disposed in a surrounding area of the first winding 43, and a first shaft 412 extending from the first body portion 411 away from the direction in which the second rotor 42 is located, and the first impeller 2 is connected to the first shaft 412; similarly, the second rotor 42 includes a second body portion 421 disposed in a surrounding area of the second winding 44, and a second rotating shaft 422 extending from the second body portion 421 in a direction opposite to the first rotor 41, and the second impeller 3 is connected to the second rotating shaft 422.
The structure of the driving device 4 is similar to the structure of integrating two motors into one, so that not only the manufacturing cost of the fan is reduced, but also the installation space required by the driving device 4 with the structure is relatively small, and the driving device is particularly suitable for the motor with limited internal installation space.
As described previously, when Q 0 At > Q, the rotation speed of the second impeller 3 needs to be increased, and in this driving device 4, the rotation speed of the second impeller 3 can be increased by increasing the second current, similarly, when Q 0 When the current is more than Q, the rotation speed of the second impeller 3 can be reduced by reducing the second current; and when Q 0 When=q, the second current is kept unchanged.
In one embodiment, the fan may further comprise a control device electrically connected to the back pressure detecting device and the driving device 4, respectively, such that the control device may calculate the air volume Q according to the detection result of the back pressure detecting device and some pre-stored or pre-input data, and according to the air volume Q and a preset air volume value Q 0 The comparison result of (2) adjusts the magnitude of the second current. According to the gear setting of the fan, at least two different preset air quantity values Q can be pre-stored in the control device 0。 Therefore, the control device adjusts the second current according to the preset air quantity value of the current gear, and the air quantity of each gear can be well ensured to be stabilized in an expected range.
In one embodiment, the blades of the first impeller 2 and the second impeller 3 are counter-rotating. As shown by the arrow marks in fig. 2, when the first impeller 2 rotates in the direction of the curved arrow in the drawing, the fluid flows through the first impeller 2 while having both a speed V2 in the direction of rotation of the blades and a speed V1 in the radial direction, so that the actual flow speed of the fluid is V3 in which V1 and V2 are combined. The direction of rotation of the second impeller 3 is set to be opposite to the direction of rotation of the first impeller 2 as shown in the figure, and the direction of V3 is substantially the same as the direction of rotation of the blades of the second impeller 3, so that the impact of the fluid on the surfaces of the blades of the second impeller 3 when flowing to the second impeller 3 can be avoided, and the loss of kinetic energy is significant. This loss of kinetic energy is particularly pronounced when the second impeller 3 is stationary. It will be appreciated that the speed V3 is preferably in a direction substantially parallel to the direction of rotation of the second impeller 3.
The second aspect of the application also provides a range hood, which comprises the fan described in any embodiment.
The third aspect of the present application also provides a fan rotation speed control method for controlling the fan described in any of the foregoing embodiments, the rotation speed control method including the steps of:
the first impeller 2 is driven to rotate in a first preset direction by a first driving part of the driving device 4;
the second impeller 3 is driven to rotate in a direction opposite to the first preset direction by a second driving part of the driving device 4 or kept stationary;
detecting the pressure at the outlet 12 of the fan through a back pressure detection device;
calculating the air quantity Q at the outlet 12 according to the detected pressure of the back pressure detection device;
the air quantity Q is compared with a preset air quantity value Q 0 Comparing;
when Q is 0 At > Q, increasing the rotation speed of the second impeller 3 by the second driving section; when Q is 0 When Q is less than the value, the rotation speed of the second impeller 3 is reduced by the second driving part; when Q is 0 When=q, the current stationary state or the current rotational speed of the second impeller 3 is maintained.
Further, upon pressure detection of the outlet 12:
the corresponding pressure value P1 and the pressure value P2 of two positions with different flow areas in the shell 1 are obtained through detection of the first pressure sensor 5 and the second pressure sensor 6;
the density ρ of the fluid, the flow area S of the housing 1 at the location of the first pressure sensor 5 1 Flow area S of the housing 1 at the location of the second pressure sensor 6 2 The pressure value P1 detected by the first pressure sensor 5 and the pressure value P2 detected by the second pressure sensor 6 are brought into the formula:
and calculating the air quantity Q.
When the driving device shown in fig. 3 is adopted, the air quantity Q is compared with a preset air quantity value Q 0 After comparison, when Q 0 At > Q, increasing the rotational speed of the second impeller 3 by increasing the second current; when Q is 0 When < Q, the rotation speed of the second impeller 3 is reduced by reducing the second current; when Q is 0 When=q, the second current is kept at the present value.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. A fan, the fan comprising:
-a housing (1), the housing (1) having an inlet (11) and an outlet (12);
a first impeller (2) and a second impeller (3) which are sequentially arranged in the shell (1) along the direction from the inlet (11) to the outlet (12), wherein the rotation axes of the first impeller (2) and the second impeller (3) are overlapped;
back pressure detection means provided within the housing (1) for detecting the pressure at the outlet (12); the method comprises the steps of,
the driving device (4), the driving device (4) comprises a first driving part for driving the first impeller (2) to rotate towards a first preset direction, and a second driving part connected with the second impeller (3), and according to the detection result of the back pressure detection device, the second driving part can drive the second impeller (3) to rotate towards the direction opposite to the first preset direction at different rotation speeds.
2. The fan according to claim 1, characterized in that the back pressure detection means comprises a first pressure sensor (5) and a second pressure sensor (6), the first pressure sensor (5) and the second pressure sensor (6) being respectively arranged at different positions of the flow area within the housing (1);
the air volume Q at the outlet (12) is calculated according to the following formula:
wherein: s is S 1 A flow area of the housing (1) at the location of the first pressure sensor (5);
S 2 a flow area of the housing (1) at the location of the second pressure sensor (6);
P 1 -a pressure measured for the first pressure sensor (5);
P 2 -a pressure measured for the second pressure sensor (6);
ρ is the density of the fluid;
the calculated air quantity Q and a preset air quantity value Q 0 Comparing when Q 0 When Q is greater than Q, the rotation speed of the second impeller (3) is increased by the second driving part; when Q is 0 When Q is less than Q, the rotation speed of the second impeller (3) is reduced by the second driving part; when Q is 0 When=q, the second impeller (3) is maintained in a current stationary state or current rotational speed.
3. The fan according to claim 2, characterized in that the driving device (4) comprises a first rotor (41) and a second rotor (42) which are respectively used as the first driving part and the second driving part, and a first winding (43) and a second winding (44) which respectively correspond to the first rotor (41) and the second rotor (42), wherein the first winding (43) and the second winding (44) can generate magnetic fields in different directions under the driving of the first current and the second current with different directions so as to drive the first rotor (41) and the second rotor (42) to rotate in different directions; and, in addition, the processing unit,
when Q is 0 At > Q, increasing the second current such that the rotational speed of the second impeller (3) increases; when Q is 0 When < Q, reducing the second current so that the rotation speed of the second impeller (3) is reduced; when Q is 0 When=q, the second current is kept unchanged.
4. A fan according to claim 3, characterized in that the drive means (4) are arranged in the housing (1) and that the first winding (43) is spaced apart from the second winding (44) in the direction from the inlet (11) to the outlet (12);
the first rotor (41) comprises a first main body part (411) arranged in a region surrounded by the first winding (43), and a first rotating shaft (412) which extends from the first main body part (411) back to the direction of the second rotor (42) and is used for driving the first impeller (2) to rotate;
the second rotor (42) comprises a second main body part (421) arranged in a region surrounded by the second winding (44), and a second rotating shaft (422) which extends from the second main body part (421) back to the direction of the first rotor (41) and is used for driving the second impeller (3) to rotate.
5. A fan according to claim 3, characterized in that it further comprises a control device electrically connected to the back pressure detection device and the driving device (4), respectively, the control device being capable of calculating the air quantity Q based on the detection result of the back pressure detection device and based on the air quantity Q and a preset air quantity value Q 0 And adjusting the magnitude of the second current.
6. The fan as claimed in claim 5, wherein the control means has at least two different preset air quantity values Q stored therein 0 。
7. A fan according to any of claims 1-6, characterized in that the blades of the first impeller (2) and the second impeller (3) are counter-rotating.
8. A range hood comprising the fan of any one of claims 1-7.
9. A fan rotation speed control method applied to the fan of any one of claims 1 to 7, characterized in that the rotation speed control method comprises the following steps:
the first impeller (2) is driven to rotate in a first preset direction by a first driving part of the driving device;
the second impeller (3) is driven to rotate in the direction opposite to the first preset direction by a second driving part of the driving device or kept stationary;
detecting the pressure at an outlet (12) of the fan through a back pressure detection device;
calculating the air quantity Q at the outlet according to the pressure detected by the back pressure detection device;
the air quantity Q is compared with a preset air quantity value Q 0 Comparing;
when Q is 0 When Q is less than Q, the rotation speed of the second impeller (3) is increased through the second driving part; when Q is 0 At > QReducing the rotational speed of the second impeller (3) by the second driving part; when Q is 0 When=q, the second impeller (3) is maintained in a current stationary state or current rotational speed.
10. The fan speed control method according to claim 9, characterized in that, when the outlet (12) is pressure-detected:
corresponding pressure values P1 and P2 of two positions with different flow areas in the shell (1) are detected by a first pressure sensor (5) and a second pressure sensor (6);
-determining the density ρ of the fluid, the flow area S of the housing (1) at the location of the first pressure sensor (5) 1 The flow area S of the housing (1) at the location of the second pressure sensor (6) 2 The pressure value P1 detected by the first pressure sensor (5) and the pressure value P2 detected by the second pressure sensor (6) are brought into a formulaAnd calculating the air quantity Q.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311117792.6A CN117090790A (en) | 2023-08-31 | 2023-08-31 | Fan, range hood with fan and fan rotating speed control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311117792.6A CN117090790A (en) | 2023-08-31 | 2023-08-31 | Fan, range hood with fan and fan rotating speed control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117090790A true CN117090790A (en) | 2023-11-21 |
Family
ID=88773332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311117792.6A Pending CN117090790A (en) | 2023-08-31 | 2023-08-31 | Fan, range hood with fan and fan rotating speed control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117090790A (en) |
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2023
- 2023-08-31 CN CN202311117792.6A patent/CN117090790A/en active Pending
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