CN112856514A - Range hood and control method thereof - Google Patents
Range hood and control method thereof Download PDFInfo
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- CN112856514A CN112856514A CN202110029054.0A CN202110029054A CN112856514A CN 112856514 A CN112856514 A CN 112856514A CN 202110029054 A CN202110029054 A CN 202110029054A CN 112856514 A CN112856514 A CN 112856514A
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- 238000005192 partition Methods 0.000 claims abstract description 41
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- 230000007246 mechanism Effects 0.000 claims description 24
- 239000012530 fluid Substances 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 9
- 230000007704 transition Effects 0.000 claims description 7
- 239000013013 elastic material Substances 0.000 claims description 4
- 238000000926 separation method Methods 0.000 description 8
- 239000000779 smoke Substances 0.000 description 6
- 238000004891 communication Methods 0.000 description 4
- 230000008676 import Effects 0.000 description 4
- 238000002955 isolation Methods 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 239000003517 fume Substances 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
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- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
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- 239000004519 grease Substances 0.000 description 1
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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
- F24C15/2021—Arrangement or mounting of control or safety systems
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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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
- F04D29/442—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps rotating diffusers
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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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
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- Engineering & Computer Science (AREA)
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- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a range hood, which comprises a fan system, wherein the fan system comprises a volute and an impeller positioned in the volute, the volute is provided with a first air inlet, the range hood also comprises an air inlet device, the air inlet device comprises a first flow guide cover arranged opposite to the first air inlet, and the range hood is characterized in that: the air inlet device further comprises a partition tongue, the partition tongue is arranged outside the volute and adjacent to the first air inlet, the first air guide sleeve and the partition tongue form a complete whole, an air inlet air channel is formed inside the first air guide sleeve and the partition tongue, the partition tongue can rotate relative to the volute so as to change the shape of the air inlet air channel, and the rotating shaft of the partition tongue is parallel to the axis of the impeller. Also discloses a control method of the range hood.
Description
Technical Field
The invention relates to an oil fume purification device, in particular to a range hood and a control method of the range hood.
Background
The range hood has become one of the indispensable kitchen household electrical appliances in modern families. The range hood works by utilizing the fluid dynamics principle, sucks and exhausts oil smoke through a centrifugal fan arranged in the range hood, and filters partial grease particles by using a filter screen. The centrifugal fan comprises a volute, an impeller arranged in the volute and a motor driving the impeller to rotate. When the impeller rotates, negative pressure suction is generated in the center of the fan, oil smoke below the range hood is sucked into the fan, accelerated by the fan and then collected and guided by the volute to be discharged out of a room.
When the range hood is in operation, the aerodynamic performance and noise are not only related to the performance of the multi-blade centrifugal fan, but also are constrained and influenced by the space at the front section of the fan inlet, as shown in fig. 11. The airflow in the fan frame of the whole range hood flows into the inlet of the fan in an abnormal vortex, the state and the strength of the vortex are factors influencing the performance and the noise of the whole range hood, and under the working conditions of small flow and large flow, the position and the strength of the vortex are different, and the aerodynamic performance and the noise of the whole range hood are also different. The air flow in the air inlet duct has a winding phenomenon, and cannot effectively flow into the inlet of the fan, and the air flow winding state and the strength performance are different under different working conditions. Referring to fig. 12, vortices appear at the upper left of the cross-section of the duct, and air rushes out at the middle right, reducing the air velocity to less than 1 m/s. The fan import has an unsteady swirl, and the state and the position of swirl change along with the different operating mode of lampblack absorber, but the general shape is the swirl the same with impeller direction of rotation, and in coordinate system XOY, in theta equals 30 position, the air current assembles and flows into the fan import. Referring to fig. 13, the air flow in the air duct at the fan inlet does not uniformly flow into the fan inlet, and a vortex exists, so that the airflow resistance at the fan inlet is increased, the air volume is reduced, and the noise is increased. These unsteady flow states are factors that affect overall performance and noise.
The solution that uses always is the air duct that admits air that adopts the water conservancy diversion formula, and the air duct that admits air first of main effect collects and controls the air current in the air duct for the air current that flows into the fan import is more even, and the velocity of flow is more stable, steadily evenly sends into the impeller import with the air current, reduces the turbulent flow in the blade way, reduces the flow loss. Secondly, eliminate and stabilize the unsteady swirl in the air inlet duct, reduce the flow loss in the air duct, reduce the turbulent noise.
For example, in the range hood with the flow stabilizing and noise reducing structure disclosed in chinese patent No. 201110006428.3 of the present applicant, the cross-sectional areas of the air ducts on the meridian plane and the radial plane gradually contract, which is beneficial to accelerating the rise of the air flow. However, the molded lines of the flow channels on the radial plane are bilaterally symmetrical, and the molded lines of the cross section of the air channel on the meridian plane are not designed, so that the air flow is convoluted in the air channel, and the air flow cannot be uniformly guided into the inlet of the fan.
Also, as disclosed in chinese patent application No. 200910213678.7, a baffle is designed in an air intake channel horizontally disposed in a side-draft range hood fan to guide airflow into an inlet of the fan. The invention changes the vortex in the air inlet channel to a certain extent by increasing the geometric shapes of the guide plate and the air inlet channel. However, the molded line of the flow channel on the radial plane is designed in a single circular arc, the flow field design is not carried out on the molded line, the problem of flow bypassing in the air duct cannot be fundamentally solved, and the airflow cannot be effectively and uniformly guided into the inlet of the fan.
The mode can eliminate the vortex in the air duct to a certain extent, is favorable for the air flow to enter the fan at an accelerated speed, but cannot effectively solve the problem of air flow convolution in the air inlet duct, and ensures that the air flow is uniformly filled with the inlet of the fan system. Under different working conditions, airflow in the air duct is different in convolute state, strength and scale, and a common internal flow guide device only has a flow control effect at certain operating working condition points and cannot act on variable working conditions of the whole machine.
Disclosure of Invention
The first technical problem to be solved by the invention is to provide an oil smoke sucking machine aiming at the defects in the prior art, which solves the problem of air flow convolution in an air inlet duct of a fan system and reduces air flow resistance at an air inlet of the fan system.
The second technical problem to be solved by the present invention is to provide a control method for the above range hood.
The technical scheme adopted by the invention for solving the first technical problem is as follows: the utility model provides a range hood, includes the fan system, the fan system includes the spiral case and is located the impeller of spiral case, first air intake has been seted up on the spiral case, range hood still includes air inlet unit, air inlet unit includes the first kuppe that sets up relative first air intake, its characterized in that: the air inlet device further comprises a partition tongue, the partition tongue is arranged outside the volute and adjacent to the first air inlet, the first air guide sleeve and the partition tongue form a complete whole, an air inlet air channel is formed inside the first air guide sleeve and the partition tongue, the partition tongue can rotate relative to the volute so as to change the shape of the air inlet air channel, and the rotating shaft of the partition tongue is parallel to the axis of the impeller.
Preferably, in order to prevent the first flow guide cover and the baffle from being separated when the baffle rotates to cause air flow leakage, the surfaces of the first flow guide cover and the baffle are connected through an elastic material.
In order to be able to follow the air intake of the corresponding spiral case of fan frame air intake water conservancy diversion extremely with the air current, range hood is still including setting up the fan frame in collection petticoat pipe top, fan system sets up in the fan frame, fan frame air intake is seted up to the bottom of fan frame, first kuppe is including the kuppe body that is the cavity form, set up at the kuppe air intake of kuppe body bottom and set up at the kuppe air outlet of kuppe body towards spiral case one side, kuppe air inlet and fan frame air intake fluid intercommunication, the kuppe air outlet corresponds the setting with the first air intake of spiral case.
In order to improve the air inlet efficiency, the volute is also provided with a second air inlet, and the first air inlet and the second air inlet are opposite in the axial direction of the impeller; the air inlet device further comprises a second air guide sleeve arranged opposite to the second air inlet, and a guide plate for guiding airflow from the air inlet of the fan frame to the two air guide sleeves respectively is arranged between the first air guide sleeve and the second air guide sleeve.
In order to ensure that the airflow uniformly and acceleratively flows into the volute, the section of the flow channel on the meridian plane of each air guide sleeve is gradually contracted from the air inlet of the air guide sleeve to the air outlet of the air guide sleeve.
In order to further ensure that the airflow flows into the volute in an accelerated way, the inlet area of the air inlet of the air guide sleeve is FiThe area of the air inlet of the corresponding volute is FoAnd satisfy
In order to facilitate the air flow to enter the first air inlet, when the air outlet of the volute is upward, a point on the axis of the impeller is taken as a first center, a coordinate system is established by taking the first center as an original point, in the coordinate system, a horizontal line passing through the first center is taken as an X axis, a vertical line passing through the first center is taken as a Y axis, the X axis takes the side opposite to the air outlet of the volute as a positive direction, the Y axis takes the first center as the positive direction, and the separation tongue is positioned in a second quadrant of the coordinate system.
In order to convert the static pressure energy of the air flow into kinetic energy and reduce the dynamic pressure loss in the air inlet duct, the air flow flowing into the air inlet duct is restrained and controlled by the semi-spiral air inlet duct, the vortex at the edge area of the air inlet duct is eliminated, the flow resistance is reduced, the air flow is ensured to be uniformly filled with the air inlet corresponding to the fan system, the molded line of the first air guide sleeve comprises a first line segment, a second line segment and a third line segment which are sequentially connected and in smooth transition, the starting point of the first line segment is positioned in the third quadrant of a coordinate system, the second line segment is a spiral line, and the equation of the second line segment is as follows:
D2the value range of m is more than 0.226 and less than 0.235, the center of the second line segment is a second center, and the coordinate of the second center is
The third line segment is a circular arc.
In order to eliminate air flow convolution in the air inlet duct, guide and gather air flow to stably flow into an air inlet of the fan, reduce resistance loss in the air inlet duct and reduce turbulence noise, the molded line of the partition tongue comprises a fourth line segment, a fifth line segment and a sixth line segment which are connected in sequence and in smooth transition, the starting point of the fourth line segment is the terminal point of the third line segment of the molded line of the first air guide sleeve, the fourth line segment and the third line segment are in smooth transition, and the fourth line segment is an arc and protrudes in the same direction as the third line segment; the fifth line segment is a circular arc and protrudes in the opposite direction to the fourth line segment, and the sixth line segment is a circular arc and protrudes in the opposite direction to the fifth line segment.
Preferably, in order to achieve a better targeted reduction of the turbulence, an angle between a line connecting the first center and the start point of the fifth line segment and the X-axis is 45 ° to 56 °.
Preferably, the radius of the fourth line segment is R3，R3130-140 mm; the radius of the fifth line segment is R4， R4The radius of the sixth line segment is R5，R5＝350～450mm。
In order to facilitate the rotation of the partition tongue, the partition tongue is in rotational connection with the volute, and the air inlet device further comprises a driving mechanism for driving the partition tongue to rotate.
In order to facilitate the rotation of the separation tongue to be automatically controlled, the range hood further comprises a motor for driving the impeller to rotate and a control circuit for controlling the driving mechanism, the control circuit comprises a rotating speed monitoring circuit for detecting the rotating speed of the motor of the fan system, an adjusting loop, a feedback circuit, a judging circuit and a driving mechanism control circuit for controlling the driving mechanism, the rotating speed monitoring circuit is connected with the input end of the feedback circuit, the adjusting loop is connected with the input end of the feedback circuit, the output end of the feedback circuit is connected with the input end of the judging circuit, and the output end of the judging circuit is connected with the input end of the driving mechanism control circuit.
The technical scheme adopted by the invention for solving the third technical problem is as follows: a control method of the range hood is characterized in that: the range hood begins to work, and the current rotational speed of motor that rotational speed monitoring circuit surveyed is Ni to feedback the detected value to the judgement circuit and carry out the logic judgement:
1) when Ni is less than Npmin, the judging circuit controls the circuit through the driving mechanism to control the rotation angle of the isolating tongue to be 15-21 degrees from the initial position to the direction close to the first air inlet;
2) when Ni is larger than Npmax, the isolating tongue is positioned at the initial position and is kept still;
3) when Npmax is larger than or equal to Npmin, the judgment circuit controls the rotation angle of the isolating tongue to be 7.5-12 degrees from the initial position to the direction close to the air inlet through the driving mechanism control circuit;
where Npmin is the rotation speed of the preset low flow condition operation, and Npmax is the rotation speed of the preset high flow condition operation.
Compared with the prior art, the invention has the advantages that: the air inlet device formed by the air guide sleeve and the partition tongue is arranged, the shape of the air inlet duct can be adjusted according to working conditions so as to adapt to the positions and scales of vortexes under different working conditions, the air flow in the air duct is effectively controlled to be convoluted, vortexes in the air duct are eliminated, turbulence noise is reduced, air flow is stably and uniformly sent to the inlet of the impeller, and the efficiency of the whole machine is improved; the molded line of the air guide cover can convert the static pressure energy of the airflow into the static pressure energy according to the specific flow field in the air inlet channel of the range hood, eliminate the impact loss of the airflow in the air inlet channel and fully and uniformly accelerate the fan system in the fan; the projection shape of the air inlet duct formed by the air guide sleeve and the partition tongue on the radial plane is basically consistent with the air flow state, the air flow in the air inlet duct can be effectively controlled and restrained, the air flow in the air inlet duct is effectively prevented from rotating, and the air flow resistance of the inlet of the fan is reduced.
Drawings
FIG. 1 is a schematic view of a range hood according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a range hood in accordance with an embodiment of the present invention;
fig. 3 is a schematic view of a fan system and an air intake device of the range hood according to the embodiment of the invention;
fig. 4 is an exploded structural schematic view (seen from back to front) of a fan system and an air intake device of the range hood according to the embodiment of the present invention;
fig. 5 is an exploded schematic structural view (viewed from front to back) of a fan system and an air intake device of the range hood according to the embodiment of the present invention;
FIG. 6 is a schematic view of an initial state of a fan system and a baffle tongue of the range hood according to the embodiment of the invention;
FIG. 7 is a schematic view of the fan system and the adjusting state of the baffle tongue of the range hood according to the embodiment of the present invention;
FIG. 8 is a graph of performance curves for a range hood according to an embodiment of the present invention;
FIG. 9 is a block diagram of a control circuit of the range hood according to the embodiment of the present invention;
fig. 10 is a control flow chart of the range hood according to the embodiment of the present invention.
FIG. 11 is a schematic view of a prior art fan inlet vortex simulation;
FIG. 12 is a schematic view of a prior art simulation of a cross-section of an intake runner;
FIG. 13 is a side view of a prior art fan inlet vortex simulation.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions.
In the description of the present invention, it is to 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," and the like are used in a generic and descriptive sense only and not for purposes of limitation, as the disclosed embodiments of the invention may be oriented in different directions and the directional terms are used for purposes of illustration and not for purposes of limitation, such as "upper" and "lower" are not necessarily limited to directions opposite to or coincident with the direction of gravity. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
Referring to fig. 1 to 2, a range hood includes a fume collecting hood 1, a fan frame 2 disposed above the fume collecting hood 1, and a fan system 3 disposed in the fan frame 2. The bottom of the smoke collecting cover 1 is provided with a smoke inlet 11, the bottom of the fan frame 2 is provided with an opening to form a fan frame air inlet 21, and the fan frame air inlet 21 is communicated with the smoke inlet 11 in a fluid mode. Thereby forming the low-suction range hood.
The fan system 3 includes a volute 31, an impeller 32 located in the volute 31, and a motor 33 for driving the impeller 32 to rotate, the fan system 3 is a double-intake fan, the volute 31 is provided with a first air inlet 311 and a second air inlet 312 corresponding to the extending direction of the axis of the impeller 32, the first air inlet 311 faces the rear side, the second air inlet 312 faces the front side, and is opposite to the impeller 32 on the axis, and the first air inlet 311 is a main air inlet.
Referring to fig. 2 to 5, the range hood further includes two air inlets for guiding the air flow from the fan frame inlet 21 to the first inlet 311 and guiding the air flow from the fan frame inlet 21 to the second inlet 312. The air inlet device comprises a first air guide sleeve 41, a second air guide sleeve 42 and a separation tongue 43, wherein the first air guide sleeve 41 is opposite to the first air inlet 311 and is arranged between the first air inlet 311 and the inner wall of the rear side of the fan frame 2, the second air guide sleeve 42 is opposite to the second air inlet 312 and is arranged between the second air inlet 312 and the inner wall of the front side of the fan frame 2, and the separation tongue 43 is arranged on one side, facing the first air guide sleeve 41, of the volute 31 and is adjacent to the first air inlet 311. The second pod 42 may not be provided. The inner side of the whole body formed by the first air guide sleeve 41 and the partition tongue 43 forms an air inlet duct.
Each air guide sleeve comprises a hollow air guide sleeve body 411, an air guide sleeve air inlet 412 arranged at the bottom of the air guide sleeve body 411 and an air guide sleeve air outlet 413 arranged at one side of the air guide sleeve body 411 facing the volute casing 31, the air guide sleeve air inlet 412 is in fluid communication with the fan frame air inlet 21, and the air guide sleeve air outlet 413 is arranged corresponding to the corresponding air inlet of the volute casing 31.
The air inlet device further includes a baffle 44 disposed between the first and second fairings 41, 42 for directing the airflow from the fan frame inlet 21 to the fairing inlets 412 of the two fairings, respectively. The two dome air inlets 412 and the guide plate 44 can cover the fan frame air inlet 21, so that the air flow flowing into the fan frame air inlet 21 is divided into the two dome air inlets 412, and flows out of the dome air outlet 413 and enters the air inlet of the scroll casing 31 after flowing through the inner side of the dome body 411, which forms an air inlet duct. The shape of the baffle 44 may take on different configurations depending on the oil path and internal flow characteristics.
The first air guide sleeve 41 and the second air guide sleeve 42 can collect and control air flow in the air inlet duct, the air flow flowing into the inlet of the fan system 3 is more uniform in flow velocity through rectification, the flow velocity is more stable, the air flow is stably and uniformly sent into the inlet of the impeller 32, turbulence in the blade duct is reduced, and flow loss is reduced. And the first air guide sleeve 41 and the second air guide sleeve 42 can eliminate and stabilize unsteady vortexes in the air inlet duct, reduce the flow loss in the air inlet duct, and reduce turbulence noise.
In addition, the profiles of the first and second fairings 41 and 42 (the contour of the projection on the plane perpendicular to the axial direction of the fan system 3, in this embodiment, the contour of the projection on the vertical plane) are semi-spiral, so that the static pressure energy of the air flow can be converted into kinetic energy, the dynamic pressure loss in the air inlet duct is reduced, the air flow flowing into the air inlet duct is restrained and controlled by the semi-spiral air inlet duct, the vortex in the edge area of the air inlet duct is eliminated, the flow resistance is reduced, and the air flow is ensured to be uniformly filled in the corresponding air inlet of the fan system 3.
The air inlet device further comprises a driving mechanism 45 for driving the partition tongue 43 to rotate, in this embodiment, the driving mechanism 45 is a servo motor and is fixed on the volute casing 31, an output shaft of the driving mechanism 45 is connected with one side of the partition tongue 43 facing the volute casing 31, and one side of the partition tongue 43 far away from the volute casing 31 is rotatably connected with the fan frame 2 through a rotating shaft 431. The output shaft and the rotation shaft 431 are coaxial and are parallel to the axis of the volute casing 31 (impeller 32), respectively.
For convenience of description, the following description will be made in terms of a fan placement mode in which the air outlet of the volute profile is upward and the edge is horizontal.
A point on the axis of the impeller 32 is taken as a first center O, a coordinate system is established by taking the point as an original point, a horizontal line passing through the first center O is taken as an X axis, a vertical line passing through the first center O is taken as a Y axis, the opposite side of the X axis corresponding to the air outlet is taken as a forward direction, and the Y axis takes the first center O as the forward direction upwards.
The molded line of each air guide sleeve comprises a first line segment AB, a second line segment BC and a third line segment CD which are connected in sequence and in smooth transition, wherein the starting point of the first line segment AB is A and is positioned in the third quadrant of the coordinate system, in the embodiment, the first line segment AB is a straight line, and the included angle between the first line segment AB and the X axis is theta1And satisfies theta175-81 degrees. The second segment BC is a helix, whose equation is:
D2the value of m is 0.226 < m < 0.235, the center coordinate of the second segment BC is the second center O1
The third segment CD is a circular arc with a radius R2＝100～115mm。
The second line segment BC is an equiangular helix, the momentum moment in the helix air duct remains unchanged, RCuConstant to prevent the air flow from winding in the air duct. The profile of the air inlet duct can be designed approximately by using a plurality of circular arcs under the condition that the momentum moment is not changed, and the function of the plurality of circular arcs is equivalent to that of a spiral line.
For example, preferably, the second segment BC is the first segment type S1The third section CD is the second section molded line S2The equation of the form line is
θ181 DEG, first section of profile S1Second center O1(21.5, 6).
In fig. 3, the partition tongue 43 is located in the fourth quadrant of the coordinate system, and is used for eliminating the air flow convolution in the air intake duct, guiding and converging the air flow to stably flow into the fan inlet, reducing the resistance loss in the air intake duct, and reducing the turbulence noise. The profile of the diaphragm 43 comprises a fourth line segment DE (third segment profile S) connected in series and smoothly transited3) A fifth section EF (a fourth section S)4) And a sixth line segment FH (a fifth line segment S5). Wherein, the starting point D of the fourth line segment DE is the first line of the first air guide sleeve 41The end point D of the third segment CD, the fourth segment DE and the third segment CD are smoothly transited and protrude in the same direction. The fourth line segment DE is a circular arc with a radius R3130-140 mm. The fifth line segment EF is a circular arc, the protruding direction of the fifth line segment EF is towards the third quadrant of the coordinate system, the direction of the fifth line segment EF is opposite to that of the fourth line segment DE, the position of the fifth line segment EF is theta (the included angle between the connecting line of the first center O and the starting point E and the X axis) between 45 degrees and 56 degrees, and the radius R of the fifth line segment EF47-10 mm. The sixth line segment FH is a circular arc with a radius R5350-450 mm, the protruding direction is opposite to the fifth line section EF, and the included angle between the tangent line at the terminal point H and the X axis is theta2。
In the examples, it is preferred that:
equation of line
θ＝45～56°，θ2＝75°。
The partition tongue 43 and the corresponding position of the air guide sleeve body 411 of the first air guide sleeve 41 are spliced into a whole, flame-retardant and corrosion-resistant materials with good elasticity are arranged on the surfaces of the air guide sleeves and the partition tongue 43, and elastic materials such as elastic skin and elastic rubber are connected into a whole, so that when the partition tongue 43 is dynamically adjusted to adapt to different working conditions, the elastic materials on the surface are elastically deformed, and the shape of the air inlet duct is changed.
The cross section of the flow channel on the meridian plane of each air guide sleeve can also be gradually contracted to ensure that the air flow uniformly accelerates to flow into the air inlet of the volute casing 31, namely, the width of the air guide sleeve is gradually reduced from the air guide sleeve air inlet 412 to the air guide sleeve air outlet 413 in the left-right direction as shown in fig. 2. The degree of contraction is determined by the size constraint of the external fan frame 2 so as to ensure the appearance shape of the whole range hood. The dome intake 412 has an inlet area FiThe corresponding air inlet area of the volute casing 31 is FoIt is preferable that the content of the compound,
under the working conditions of small flow and large flow, the vortex strength and the position of the air inlet of the low-suction range hood fan system 3 are different, and the performance and the noise are different. In order to take a targeted flow control measure for the unsteady vortex of the air inlet of the fan system 3 of the range hood under different working conditions, the operating condition range of the range hood is judged according to the operating rotating speed Ni of the fan system 3 of the range hood through a performance curve of the range hood so as to control the position of a separation tongue 43 at the air inlet of the fan system 3, thereby playing a role in stabilizing and guiding the vortex of the fan system 3.
Referring to fig. 9, the control circuit of the drive mechanism 45 includes a rotational speed monitoring circuit 61, a regulation circuit 62, a feedback circuit 63, and a judgment circuit 64. The rotation speed monitoring circuit 61 may be an electromagnetic sensor, and is connected to an input end of the feedback circuit 63, and the feedback circuit 63 may be an amplifying circuit, which plays a role of enhancing the original input signal (rotation speed signal) and enhancing or reducing the input signal. The electromagnetic sensor is simple in structure and free from the influence of vibration, temperature and dust, the detection gear is arranged on an output shaft of a motor 33 of the fan system 3, the sensor is close to the tooth tip of the gear, the gap between the sensor and the gear is 0.5-1 mm, and a frequency signal proportional to the rotating speed is taken out. The advantages of using an electromagnetic sensor are as follows: 1. the structure is simple, the rigidity is good, the environment resistance is good, and the influence of vibration, temperature, oil dust and the like is avoided; 2. because the signal is detected in a non-contact way, the rotating body is not loaded, and the safety measurement can be realized; 3. because the self-generating type is not required to be powered, the power generation type is most suitable for being arranged on the site.
The regulator circuit 62 is a potentiometer, is connected to an input terminal of the feedback circuit 63, and is used for pre-zeroing as a reference for the electromagnetic sensor. An output terminal of the feedback circuit 63 is connected to an input terminal of the judgment circuit 64, and an output terminal of the judgment circuit 64 is connected to an input terminal of a drive mechanism control circuit 65 for controlling the drive mechanism 45. The judgment circuit 64 is a logic circuit and functions as a circuit for performing a logic operation.
The low flow operating condition Q shown in this embodimentmin＝8.5m3Min, high flow rate operating mode Qmax＝16m3Min, high efficiency zone working condition 8.5m3/min＜Qbep＜16m3And/min. Referring to the performance curve of the range hood shown in fig. 8, the performance curve is obtained according to the linear difference valueThe rotating speeds of the range hood operating under the working conditions of small flow, large flow and high-efficiency area are respectively
Wherein Q ispbepThe range hood is indicated to operate in a high-efficiency flow range area; n is a radical ofpbepIs corresponding to QpbepLinear differential rotational speed over a range of flow rates. N is as defined abovepminAnd NpmaxIs a preset value. Taking a point (Q) on the performance curve1，P1，n1) According to the similarity law, the rotating speed of the range hood running under the working conditions of small flow, large flow and high-efficiency area is converted into
When the rotation center of the isolation tongue 43 is the third center O ', in the initial state, referring to fig. 6, the connection line between the end point H of the sixth profile line FH of the isolation tongue 43 and the third center O ' is O ' H, and the included angle θ between O ' H and the horizontal line of the second center O ' is086 °; the initial state may be other positions, but is usually the limit position (blocked by the fan frame 2) where the baffle 43 rotates away from the first air inlet 311. Under the working condition of large flow, the isolating tongue 43 rotates towards the first air inlet 311, and the included angle between the O 'H and the horizontal line of the third center O' is theta0', see fig. 7; under the working condition of the high-efficiency area, the separation tongue 43 rotates towards the first air inlet 311, and the included angle theta between the O' H and the horizontal line of the third center O0", Δ θ denotes the amount of change in the position of the diaphragm 43.
Referring to fig. 9, when the range hood starts to work, the rotation speed monitoring circuit 61 (electromagnetic sensor) detects that the current rotation speed is Ni, and feeds the detection value back to the judging circuit 64 for logic judgment:
1) when Ni is less than Npmin, the range hood operates under the working condition of large flow and at large flowUnder the working condition, the center and scale of the vortex in the air inlet duct move towards the center of the first air inlet 311, the structure of the air inlet duct is adjusted, the center of the projection shape of the radial plane of the whole air duct moves towards the center of the fan to effectively control and restrict the vortex flow state, at the moment, the position of the separation tongue 43 changes, the judgment circuit 64 controls the circuit 65 through the driving mechanism, so that the driving mechanism 45 is controlled to operate to enable the separation tongue 43 to rotate to the position theta in the direction close to the first air inlet 3110’＝θ0+ Δ θ, Δ θ is 15 ° to 21 °, Δ θ is 15.3 ° in this embodiment;
2) when Ni is larger than Npmax, the range hood operates under a low-flow working condition, the center and scale of a vortex in the air inlet duct are mainly in the right lower area of the first air inlet 311, in order to effectively control and restrain an unsteady vortex in the air inlet duct, the surface skin is driven to deform by adjusting the position of the partition tongue 43, the shape of the whole air inlet duct is changed and is matched with the vortex state, airflow is fully rectified and guided, the airflow in the air inlet duct is effectively eliminated from being convoluted, the fan efficiency is improved, and the aerodynamic noise is reduced; at the moment, the position of the partition tongue 43 is unchanged, the partition tongue is located at an initial position, delta theta is 0 degrees, the flow channel profile line of the partition tongue 43 is matched with the scale of the air channel vortex, the airflow is fully rectified and guided, the air flow in the air channel can be eliminated under the working condition and is wound, more airflow is guided to enter the fan, the efficiency of the fan is improved, and the aerodynamic noise is reduced;
3) when Npmax is larger than or equal to Npmin, the range hood operates in a high-efficiency working condition area, the fan operates in a high-efficiency working condition, the position of a vortex in the air inlet duct is between a large-flow working condition and a small-flow working condition, and in order to match the vortex state in the air inlet duct again, the shape of the air inlet duct is adjusted by controlling the position of the partition tongue 43 to control the skin; at this time, the position of the isolation tongue 43 changes, and the determination circuit 64 controls the driving mechanism 45 to rotate the isolation tongue 43 to the position θ in the direction approaching the air inlet 311 through the driving mechanism control circuit 651＝θ0+ Δ θ, Δ θ is 7.5 ° to 12 °, and Δ θ in this embodiment is 10.5 °.
The term "fluid communication" as used herein refers to a spatial relationship between two components or portions (hereinafter collectively referred to as a first portion and a second portion, respectively), i.e., a fluid (gas, liquid or a mixture of both) can flow along a flow path from the first portion and/or be transported to the second portion, and may be a direct communication between the first portion and the second portion, or an indirect communication between the first portion and the second portion via at least one third element, such as a fluid channel, e.g., a pipe, a channel, a duct, a flow guide, a hole, a groove, or a chamber that allows a fluid to flow through, or a combination thereof.
Claims (14)
1. The utility model provides a range hood, includes fan system (3), fan system (3) include spiral case (31) and be located impeller (32) of spiral case (31), first air intake (311) have been seted up on spiral case (31), range hood still includes air inlet unit, air inlet unit includes first kuppe (41) that relative first air intake (311) set up, its characterized in that: the air inlet device further comprises a partition tongue (43), the partition tongue (43) is arranged outside the volute (31) and adjacent to the first air inlet (311), the first air guide sleeve (41) and the partition tongue (43) form a complete whole body and form an air inlet air channel inside the first air guide sleeve and the partition tongue, the partition tongue (43) can rotate relative to the volute (31) so as to change the shape of the air inlet air channel, and the rotating shaft of the partition tongue (43) is parallel to the axis of the impeller (32).
2. The range hood of claim 1, wherein: the surfaces of the first air guide sleeve (41) and the baffle tongue (43) are connected through elastic materials.
3. The range hood of claim 1 or 2, wherein: range hood is still including setting up fan frame (2) in collection petticoat pipe (1) top, fan system (3) set up in fan frame (2), fan frame air intake (21) are seted up to the bottom of fan frame (2), first kuppe (41) are including kuppe body (411) that is the cavity form, set up kuppe air intake (412) in kuppe body (411) bottom and set up kuppe air outlet (413) towards spiral case (31) one side in kuppe body (411), kuppe air intake (412) and fan frame air intake (21) fluid intercommunication, kuppe air outlet (413) correspond the setting with first air intake (311) of spiral case (31).
4. The range hood of claim 3, wherein: the volute (31) is also provided with a second air inlet (312), and the first air inlet (311) and the second air inlet (312) are opposite to each other in the axial direction of the impeller (32); the air inlet device further comprises a second air guide sleeve (42) arranged opposite to the second air inlet (312), and air guide plates (44) for guiding air flow from the air inlet (21) of the fan frame to the two air guide sleeves respectively are arranged between the first air guide sleeve (41) and the second air guide sleeve (42).
5. The range hood of claim 3, wherein: the section of the flow channel on the meridian plane of each air guide sleeve gradually shrinks from the air guide sleeve air inlet (412) to the air guide sleeve air outlet (413).
6. The range hood of claim 5, wherein: the inlet area of the air inlet (412) of the air guide sleeve is FiThe corresponding air inlet area of the volute (31) is FoAnd satisfy
7. The range hood of claim 1 or 2, wherein: when the air outlet of the volute (31) faces upwards, a point on the axis of the impeller (32) is taken as a first center (O), a coordinate system is established by taking the first center (O) as an original point, in the coordinate system, a horizontal line passing through the first center (O) is taken as an X axis, a vertical line passing through the first center (O) is taken as a Y axis, the X axis is taken by the side opposite to the air outlet of the volute (31) as a positive direction, the Y axis is taken by the first center (O) upwards as a positive direction, and the partition tongue (43) is located in a second quadrant of the coordinate system.
8. The range hood of claim 7, wherein: the first guideThe molded line of the flow cover (41) comprises a first line segment (AB), a second line segment (BC) and a third line segment (CD) which are connected in sequence and in smooth transition, the starting point (A) of the first line segment (AB) is located in the third quadrant of a coordinate system, the second line segment (BC) is a spiral line, and the equation of the second line segment (BC) is as follows:
D2m is a diameter of the impeller (32) in a range of 0.226 < m < 0.235, the second line segment (BC) has a second center (O1) at its center, and the second center (O1) is located at its coordinate
The third line segment (CD) is a circular arc.
9. The range hood of claim 8, wherein: the molded line of the partition tongue (43) comprises a fourth line segment (DE), a fifth line segment (EF) and a sixth line segment (FH) which are connected in sequence and in smooth transition, the starting point (D) of the fourth line segment (DE) is the terminal point (D) of a third line segment (CD) of the molded line of the first air guide sleeve (41), the fourth line segment (DE) and the third line segment (CD) are in smooth transition, and the fourth line segment (DE) is a circular arc and protrudes in the same direction as the third line segment (CD); the fifth line segment (EF) is a circular arc and protrudes in the opposite direction to the fourth line segment (DE), and the sixth line segment (FH) is a circular arc and protrudes in the opposite direction to the fifth line segment (EF).
10. The range hood of claim 8, wherein: and the included angle between the connecting line of the first center (O) and the starting point (E) of the fifth line segment (EF) and the X axis is 45-56 degrees.
11. The range hood of claim 9, wherein: the fourth line segment (DE) is R3，R3130-140 mm; the fifth line segment (E)F) Has a radius of R4，R4The radius of the sixth line segment (FH) is R5，R5＝350～450mm。
12. The range hood of claim 1 or 2, wherein: the partition tongue (43) is rotationally connected with the volute (31), and the air inlet device further comprises a driving mechanism (45) for driving the partition tongue (43) to rotate.
13. The range hood of claim 12, wherein: the range hood is still including the control circuit who is used for driving impeller (32) pivoted motor (33) and control actuating mechanism (45), control circuit is including rotational speed monitoring circuit (61), regulation loop (62), feedback circuit (63), judgement circuit (64) that are used for detecting motor (33) rotational speed of fan system (3) and drive mechanism control circuit (65) that are used for controlling drive mechanism (45), rotational speed monitoring circuit (61) are connected with the input of feedback circuit (63), regulation loop (62) are connected with the input of feedback circuit (63), the output of feedback circuit (63) is connected with the input of judgement circuit (64), the output of judgement circuit (64) is connected with the input of drive mechanism control circuit (65).
14. A control method of a range hood as claimed in claim 13, wherein:
the range hood starts to work, the current rotating speed of the motor (33) is measured to be Ni by the rotating speed monitoring circuit (61), and the detected value is fed back to the judging circuit (64) for logic judgment:
1) when Ni is less than Npmin, the judging circuit (64) controls the rotation angle of the isolating tongue (43) from the initial position to the direction close to the first air inlet (311) to be 15-21 degrees through the driving mechanism control circuit (65);
2) when Ni is larger than Npmax, the isolating tongue (43) is positioned at the initial position and is kept still;
3) when Npmax is larger than or equal to Npmin, the judging circuit (64) controls the rotation angle of the isolating tongue (43) from the initial position to the direction close to the air inlet (311) to be 7.5-12 degrees through the driving mechanism control circuit (65);
where Npmin is the rotation speed of the preset low flow condition operation, and Npmax is the rotation speed of the preset high flow condition operation.
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| CN202110029054.0A CN112856514A (en) | 2021-01-11 | 2021-01-11 | Range hood and control method thereof |
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| CN202110029054.0A CN112856514A (en) | 2021-01-11 | 2021-01-11 | Range hood and control method thereof |
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| CN112856514A true CN112856514A (en) | 2021-05-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114198321A (en) * | 2021-12-03 | 2022-03-18 | 合肥联宝信息技术有限公司 | Centrifugal fan with self-adaptive flow channel |
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