CN109209959B - Range hood, series fan system thereof, control method, connecting piece and fan system - Google Patents
Range hood, series fan system thereof, control method, connecting piece and fan system Download PDFInfo
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- CN109209959B CN109209959B CN201710549457.1A CN201710549457A CN109209959B CN 109209959 B CN109209959 B CN 109209959B CN 201710549457 A CN201710549457 A CN 201710549457A CN 109209959 B CN109209959 B CN 109209959B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000001514 detection method Methods 0.000 claims abstract description 118
- 239000012530 fluid Substances 0.000 claims abstract description 109
- 230000003068 static effect Effects 0.000 claims description 38
- 239000006096 absorbing agent Substances 0.000 claims description 15
- 239000006233 lamp black Substances 0.000 claims description 15
- 238000004891 communication Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 8
- 238000013461 design Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
- F04D25/00—Pumping installations or systems
- F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
- F04D25/166—Combinations of two or more pumps ; Producing two or more separate gas flows using fans
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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
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/005—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by changing flow path between different stages or between a plurality of compressors; Load distribution between compressors
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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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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ventilation (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A range hood, a series fan system thereof, a control method, a connecting piece and a fan system are provided, wherein the series fan system for the range hood comprises: a first fan; a second fan; the two ends of the connecting piece are respectively connected with the air outlet end of the first fan and the air inlet end of the second fan; the connecting piece comprises a control switch, a first fan and a second fan, wherein the control switch is used for detecting the fluid characteristics of a detection point in the connecting piece and controlling the working state of the second fan according to the fluid characteristics so as to enable the second fan to be opened along with the opening of the first fan and be closed along with the closing of the first fan; the connecting piece further comprises a throat, the opening section size of the throat is smaller than that of other parts in the connecting piece, and the detection point is located between the throat and the air outlet end of the first fan. According to the technical scheme provided by the invention, the installation mode of the second fan can be simplified on the premise of not changing the first fan, the two fans can work in a linkage manner, and the working efficiency of the whole series fan system can be effectively improved.
Description
Technical Field
The invention relates to the field of household appliances, in particular to a range hood, a series fan system thereof, a control method, a connecting piece and a fan system.
Background
The wind pressure and the exhaust air volume are used as two key indexes for measuring the performance of the range hood, and whether the range hood is popular with the public or not is determined to a great extent. This results in that when a range hood manufacturer designs a range hood, the wind pressure and the air discharge amount are used as two large reference factors of the design, and it is expected that the finally designed fan system can have a large wind pressure, and has a large air discharge amount under the condition that the wind pressure is determined.
In order to increase the wind pressure, the existing technical scheme is to connect two fans in series to be placed in the range hood as a whole. However, the existing series fan system realizes the on-off control of the two fans through circuit connection. For example, two fans are connected in series as a whole, and the switches of the two fans are controlled simultaneously through the master control chip.
Although the wind pressure of lampblack absorber can be improved to a certain extent in such scheme, in practical application, such series connection fan system needs to make great change to the circuit structure of lampblack absorber, and the design cycle is long, and is unfavorable for large-scale popularization and application.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is how to design an easy-to-implement series fan system, so that a plurality of fans included in the series fan system can realize linkage work, and further the working efficiency of the whole series fan system is improved.
In order to solve the technical problem, the invention provides a series fan system for a range hood, which is characterized by comprising: a first fan; a second fan; the two ends of the connecting piece are respectively connected with the air outlet end of the first fan and the air inlet end of the second fan, so that the airflow flowing out of the air outlet end of the first fan flows into the air inlet end of the second fan through the connecting piece; the connecting piece comprises a control switch, wherein the control switch is used for detecting the fluid characteristics of a detection point in the connecting piece and controlling the working state of the second fan according to the fluid characteristics so as to enable the second fan to be opened along with the opening of the first fan and be closed along with the closing of the first fan; the connecting piece further comprises a throat, the opening section size of the throat is smaller than that of other parts in the connecting piece, and the detection point is located between the throat and the air outlet end of the first fan.
Optionally, the control switch controls the working state of the second fan according to the comparison result between the fluid characteristic and a preset control threshold; when the fluid characteristic is greater than the preset control threshold value, the control switch controls the second fan to be turned on; and when the fluid characteristic is smaller than the preset control threshold value, the control switch controls the second fan to be turned off.
Optionally, the fluid characteristics of the detection point include any one or more of the following elements: static pressure, dynamic pressure, full pressure, air volume and flow rate.
Optionally, the control switch includes: and the pressure switch is used for detecting the static pressure of the detection point and controlling the working state of the second fan according to the static pressure.
Optionally, the control switch includes: a sensor for acquiring fluid characteristics of the detection point; and the trigger switch is communicated with the sensor so as to control the working state of the second fan according to the fluid characteristics of the detection point acquired by the sensor.
Optionally, the first fan and the second fan share a power line; or the first fan and the second fan are respectively provided with an independent power line.
Optionally, the opening cross-sectional dimensions of other portions in the connecting piece gradually decrease from a first position on the connecting piece to the throat, and the first position on the connecting piece is located between the air outlet end of the first fan and the throat.
Optionally, the opening cross-sectional dimensions of other parts in the connecting member gradually increase between the throat and a second position on the connecting member, and the second position on the connecting member is located between the air inlet end of the second fan and the throat.
Optionally, the cross-sectional size of the opening at other locations in the connector remains unchanged.
Optionally, the fluid characteristic of the detection point is an absolute fluid characteristic or a relative fluid characteristic, wherein the relative fluid characteristic is a fluid characteristic expressed with reference to a fluid characteristic outside the connection piece associated with the detection point.
The invention further provides a range hood which comprises a body, wherein the series fan system is arranged on the body.
The invention also provides a fan system, which comprises a fan, wherein the fan is provided with an air inlet end, and the fan further comprises: the connecting piece is connected with the air inlet end of the fan, so that air flow flows in from the vacant end of the connecting piece and flows into the air inlet end of the fan through the connecting piece; the connecting piece comprises a control switch, a fan and a control unit, wherein the control switch is used for detecting the fluid characteristics of a detection point in the connecting piece and controlling the working state of the fan according to the fluid characteristics; the connecting piece also comprises a throat, the opening section size of the throat is smaller than the opening section sizes of other parts in the connecting piece, and the detection point is positioned between the throat and the vacant end of the connecting piece.
Optionally, the free end of the connecting member is configured to be adapted to engage an exhaust port of a range hood.
Optionally, the cross-sectional size of the opening at another position in the connecting piece gradually decreases from the first position on the connecting piece to the throat, and the first position on the connecting piece is located between the empty end and the throat.
Optionally, the opening cross-sectional dimensions of other parts in the connecting member gradually increase between the throat and the second position, and the second position on the connecting member is located between the air inlet end of the fan and the throat.
Optionally, the cross-sectional size of the opening at other locations in the connector remains unchanged.
The present invention also provides a connecting member for a range hood, the connecting member including: a null end; a connecting end; a control switch for detecting a fluid characteristic of a detection point within the connection, a switch state of the control switch being determined by the fluid characteristic; the opening section size of the throat is smaller than that of other parts in the connecting piece; wherein the detection point is positioned between the throat and the vacant end.
Optionally, when the fluid characteristic of the detection point is greater than a preset control threshold, determining that the control switch is turned on; and when the fluid characteristic of the detection point is smaller than a preset control threshold value, determining that the control switch is turned off.
The invention also provides a control method of the range hood, the range hood comprises a first fan and a second fan, the first fan and the second fan are connected through a connecting piece, so that airflow flowing out of the air outlet end of the first fan flows into the air inlet end of the second fan through the connecting piece, and the control method comprises the following steps: collecting fluid characteristics of a detection point preset in the connecting piece; judging the working state of the first fan according to the fluid characteristics of the detection point; and controlling the working state of the second fan according to the judgment result so as to enable the second fan to be opened along with the opening of the first fan and to be closed along with the closing of the first fan.
Optionally, the connecting piece includes a throat, the opening cross-sectional size of the throat is smaller than the opening cross-sectional size of other parts in the connecting piece, and the detection point is located between the throat and the air outlet end of the first fan.
Optionally, the determining the working state of the first fan according to the fluid characteristics of the detection point includes: judging the working state of the first fan according to the comparison result of the fluid characteristic and a preset control threshold; when the comparison result shows that the fluid characteristic is larger than the preset control threshold, judging and determining that the first fan is in an open state; when the comparison result shows that the fluid characteristic is smaller than the preset control threshold, judging and determining that the first fan is in a closed state; the controlling the working state of the second fan according to the judgment result comprises: when the judgment result shows that the first fan is in an open state, controlling the second fan to be opened; otherwise, controlling the second fan to be closed.
Compared with the prior art, the technical scheme of the invention has the following advantages:
according to the series fan system provided by the embodiment of the invention, the first fan and the second fan are connected through the connecting piece, so that the airflow can flow into the second fan through the connecting piece after flowing out of the first fan. Further, the connecting piece comprises a control switch, so that the working state of the second fan can be controlled according to the detected fluid characteristics of the detection points in the connecting piece, and the second fan can be linked with the first fan. Compared with the prior technical scheme of respectively controlling the working states of all fans in the series fan system through circuit connection, the technical scheme of the embodiment of the invention can install the second fan in a simpler installation mode on the premise of not changing the first fan, and ensures that all fans in the series fan system can work in a linkage mode through the connecting piece and the control switch, thereby better improving the air pressure and the air exhaust amount of the range hood. The technical personnel in the field understand that as the linkage work of each fan in the series fan system of the embodiment of the invention is not controlled by a circuit (such as a chip), in practical application, under the condition that the first fan of the range hood exists, the range hood does not need to be changed, and only the first fan and the second fan need to be connected by a connecting piece, the series fan system of the embodiment of the invention can be obtained, is easy to implement and is beneficial to large-scale popularization and application. Further, the connecting piece comprises a throat, the detection point is located between the throat and the air outlet end of the first fan, so that the fluid characteristics detected at the detection point tend to be stable through blocking of the throat, and the first fan and the second fan can achieve more accurate linkage work. Furthermore, the section size of the throat opening is reasonably designed, so that the temperature rise of each fan in the series fan system can be effectively reduced, and the working efficiency of the whole series fan system is improved.
Further, the control switch can control the working state of the second fan according to the comparison result of the fluid characteristic and a preset control threshold value so as to judge the working state of the first fan more accurately, and further control the working state of the second fan according to the judgment result, so that the second fan can be opened along with the opening of the first fan and can be closed along with the closing of the first fan.
Further, the fluid characteristics of the detection point include at least: static pressure, dynamic pressure, full pressure, air volume and flow rate. The skilled person understands that the above physical quantities all have the common point that they can be used to measure the airflow flowing condition in the connecting piece, and by detecting any one or more of these physical quantities, the control switch can timely know the working state of the first fan (for example, whether the first fan is turned on or off), so as to realize the linkage control of the second fan.
Further, the control switch may include a pressure switch, and accordingly, the fluid characteristic may be a static pressure, and the pressure switch may directly control the operating state of the second fan according to the static pressure at the detection point. For example, in practical applications, the pressure switch may be disposed on the connecting member and communicated with the inside of the connecting member to obtain the static pressure of the detection point; and the pressure switch can also be connected in series to a power line connecting the second fan and a main power supply of the range hood so as to directly complete the on-off control of the second fan through the pressure switch. The technical personnel in the field understand that by adopting the series fan system provided by the embodiment of the invention, the linkage work of all fans in the series fan system can be realized without replacing the original control chip of the range hood and additionally adding a control chip of the second fan, and the installation operation of the second fan is greatly simplified.
Further, the control switch may further include a sensor and a trigger switch, wherein the trigger switch may control an operating state of the second fan according to the fluid characteristic of the detection point acquired by the sensor. For example, in practical applications, the sensor may be disposed on the connector to detect a fluid characteristic of the detection point; the trigger switch can be connected in series to a power line connecting the second fan and a main power supply of the range hood and is in communication with the sensor to receive and control the on-off condition of the current between the second fan and the main power supply of the range hood according to data collected by the sensor, so that the switch of the second fan is controlled. The technical personnel in the field understand that by adopting the series fan system provided by the embodiment of the invention, the linkage work of all fans in the series fan system can be realized without replacing the original control chip of the range hood and additionally adding a control chip of the second fan, and the installation operation of the second fan is greatly simplified.
Further, the first fan and the second fan can share a power line, or the first fan and the second fan can also respectively have independent power lines so as to obtain electric energy from the main power supply of the range hood.
Furthermore, the cross-sectional sizes of openings at other positions in the connecting piece are gradually reduced from a first position on the connecting piece to the throat, and the first position on the connecting piece is located between the air outlet end of the first fan and the throat. Furthermore, the opening cross-sectional sizes of other parts in the connecting piece are gradually increased between the throat and a second position on the connecting piece, and the second position on the connecting piece is positioned between the air inlet end of the second fan and the throat. The technical personnel in the field understand that the connecting piece designed by the embodiment of the invention is beneficial to obtaining a more stable fluid characteristic detection result at the detection point, reducing the influence of the airflow in the connecting piece on the detection result as much as possible and avoiding the misoperation of the control switch.
Furthermore, the opening section sizes of other positions in the connecting piece also can keep unchanged, so that the overall structure of the series fan system is more compact and can be adapted to range hoods of different sizes.
Further, the fluid characteristic of the detection point may be an absolute fluid characteristic or a relative fluid characteristic. Wherein the relative fluid characteristic is a fluid characteristic represented with reference to a fluid characteristic external to the connection associated with the detection point. For example, the pressure switch may control the operating state of the second fan according to the difference between the internal and external static pressures of the detection point, so as to improve the recognition sensitivity of the pressure switch, ensure that the pressure switch can timely and accurately recognize the change of the operating state of the first fan, and further control the second fan to work in a linkage manner.
Further, the embodiment of the invention also provides the range hood, the range hood comprises a body and the series fan system, and the range hood can improve the air pressure and the air exhaust volume of the range hood based on the series fan system and optimize the user experience.
Further, the embodiment of the invention also provides a fan system, and the fan system comprises the fan (namely the second fan) and a connecting piece. Further, the connecting piece comprises the control switch and a throat. The fan can be used as an independent part to be assembled on the existing range hood to be connected with the original fan of the range hood in series to form the series fan system, so that the air pressure and the air exhaust amount of the range hood are increased. Furthermore, the original fan of the range hood is not required to be changed in the assembling process, the operation is convenient, the circuit structure of the range hood is hardly required to be changed, and the large-scale popularization and application are easy.
Further, the embodiment of the invention also provides a connecting piece for the range hood, and the connecting piece comprises a vacant end, a connecting end, the control switch and a throat opening. The technical effect of increasing the air pressure and the air exhaust volume of the range hood is that the connecting piece can be used as an independent part to be assembled on the existing range hood so as to connect the two original fans of the range hood in series, or the connecting piece can also be used for connecting the original fan of the range hood in series with a newly added fan so as to form the series fan system. Furthermore, the original fan of the range hood is not required to be changed in the assembling process, the operation is convenient, the circuit structure of the range hood is hardly required to be changed, and the large-scale popularization and application are easy.
Further, an embodiment of the present invention further provides a control method for a range hood, where a fluid characteristic of a detection point preset in a connecting piece (used for connecting a first fan and a second fan of the range hood in series) is collected, a working state of the first fan is judged according to the fluid characteristic of the detection point, and a working state of the second fan is controlled according to a judgment result, so that the second fan is opened along with the opening of the first fan and is closed along with the closing of the first fan. The technical scheme of the embodiment of the invention can be used for automatically controlling the working state of the second fan by identifying the working state of the first fan without designing a special circuit control logic for the second fan, so that two fans in the range hood can work in a linkage manner, and the technical effect of increasing the air pressure and the air exhaust amount of the range hood is realized.
Further, when the comparison result shows that the fluid characteristic is greater than the preset control threshold, judging and determining that the first fan is in an open state, and further controlling the second fan to be opened; and when the comparison result shows that the fluid characteristic is smaller than the preset control threshold, judging and determining that the first fan is in a closed state, and further controlling the second fan to be closed. The technical scheme of the embodiment of the invention can ensure that the second fan is automatically opened along with the opening of the first fan and is automatically closed along with the closing of the first fan.
Drawings
Fig. 1 is a schematic structural diagram of a series fan system for a range hood according to a first embodiment of the present invention;
FIG. 2 is a schematic structural view of a connector embodying embodiments of the present invention;
FIG. 3 is a schematic structural view of another connector embodying embodiments of the present invention;
FIG. 4 is a schematic diagram of a sensor employing an embodiment of the present invention;
FIG. 5 is a schematic diagram of another sensor employing an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a series fan system for a range hood according to a variation of the embodiment of the present invention;
FIG. 7 is a schematic structural view of another connector embodying embodiments of the present invention;
fig. 8 is a schematic view of a range hood according to a second embodiment of the present invention;
fig. 9 is a schematic view of a further range hood according to a second embodiment of the present invention;
FIG. 10 is a schematic structural view of a fan system according to a third embodiment of the present invention;
FIG. 11 is a schematic structural view of a fan system according to a variation of the third embodiment of the present invention;
fig. 12 is a connecting member for a range hood according to a fourth embodiment of the present invention;
fig. 13 is a flowchart of a control method of a range hood according to a fifth embodiment of the present invention.
In the figure: 62-a series fan system for a range hood; 1-a first fan; 2-a second fan (or fan); 3-a connector; 11-air outlet end; 21-air inlet end; 4-control switch; p1-detection point; 5-laryngeal opening; 42-a sensor; 43-trigger switch; 32-a first position; 33-a second position; 6-smoke exhaust ventilator; 61-a body; 7-a fan system; 31-null end; 34-a connection end; air-flow; h 1-height difference; h 2-height difference; 12-a power line; 23-a power line; 41-pressure switch.
Detailed Description
As background art says, in current lampblack absorber, generally adopt series connection fan system to increase the wind pressure of lampblack absorber to the volume of airing exhaust of better improvement lampblack absorber optimizes user experience.
For the existing series fan system for the range hood, as the number of the fans is increased, a manufacturer needs to add a set of corresponding control circuit while additionally arranging the fans in the range hood so as to control the working state of each fan in the series fan system; or, manufacturers choose to redesign the control chip, so that the control chip which only needs to control one fan originally can control two fans at the same time.
However, no matter which scheme is adopted, the circuit structure of the range hood needs to be greatly improved, the design period is long, and the range hood is not beneficial to large-scale popularization and application.
In order to solve the technical problem, the technical scheme of the embodiment of the invention provides a series fan system for a range hood, wherein a first fan and a second fan are connected through a connecting piece, so that airflow can flow into the second fan through the connecting piece after flowing out of the first fan. Further, the connecting piece comprises a control switch, so that the working state of the second fan can be controlled according to the detected fluid characteristics of the detection points in the connecting piece, and the second fan can be linked with the first fan.
The technical scheme of the embodiment of the invention can install the second fan in a simpler installation mode on the premise that the first fan is not changed, and ensures that all fans in the series fan system can work in a linkage manner through the connecting piece and the control switch, so that the air pressure and the air exhaust amount of the range hood are improved better.
Furthermore, since the linkage work of each fan in the series fan system of the embodiment of the invention is not controlled by a circuit (such as a chip), in practical application, under the condition that the first fan of the range hood already exists, the range hood does not need to be changed, and only the first fan and the second fan need to be connected by a connecting piece, the series fan system of the embodiment of the invention can be obtained, and the series fan system is easy to implement and beneficial to large-scale popularization and application.
Further, the connecting piece comprises a throat, the detection point is located between the throat and the air outlet end of the first fan, so that the fluid characteristics detected at the detection point tend to be stable through blocking of the throat, and the first fan and the second fan can achieve more accurate linkage work. The technical personnel in the field understand that the temperature rise of each fan in the series fan system can be effectively reduced through reasonably designing the sectional dimension of the throat, and further the working efficiency of the whole series fan system is improved.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a schematic structural diagram of a series fan system 62 for a range hood according to a first embodiment of the present invention. Wherein, the series connection fan system 62 can increase the wind pressure of lampblack absorber through the mode of establishing ties at least two fans to satisfy the user demand that the user obtained bigger air discharge volume. For convenience of understanding, the embodiment is described by taking only two fans connected in series as an example, but in practical application, the serial fan system 62 for the range hood may also be connected in series with three or more fans, and those skilled in the art may change more embodiments according to actual needs, which does not affect the technical content of the present invention.
Specifically, in the present embodiment, the series fan system 62 may include a first fan 1; a second fan 2; and the two ends of the connecting piece 3 are respectively connected with the Air outlet end 11 of the first fan 1 and the Air inlet end 21 of the second fan 2, so that the airflow Air flowing out of the Air outlet end 11 of the first fan 1 flows into the Air inlet end 21 of the second fan 2 through the connecting piece 3. Further, the Air flow Air also flows out of the Air outlet end 22 of the second fan 2 through the second fan 2. The first fan 1 and the second fan 2 can be fans adopted in the prior art, and the technical scheme of the embodiment of the invention focuses on how to design a series fan system which is easy to implement, so that the working effect of the series fan system can be obtained by slightly changing the existing structure of the range hood.
More specifically, referring to fig. 2, the connector 3 may further include a control switch 4 for detecting a fluid characteristic of a detection point P1 in the connector 3 and controlling an operating state of the second fan 2 according to the fluid characteristic, so that the second fan 2 is turned on when the first fan 1 is turned on and is turned off when the first fan 1 is turned off.
Furthermore, the connecting piece 3 includes a throat 5, the opening cross-sectional size of the throat 5 is smaller than the opening cross-sectional size of other parts in the connecting piece 3, and the detection point P1 is located between the throat 5 and the air outlet end 11 of the first fan 1.
In a typical application scenario, the control switch 4 may control the operating state of the second fan 2 according to the comparison result of the fluid characteristic and a preset control threshold. Wherein the preset control threshold may be preset by a user and/or a manufacturer. Further, in the using process, the user can also modify the set value of the preset control threshold. Those skilled in the art understand that, through the preset control threshold, the control switch 4 can more accurately determine the working state of the first fan 1, and then control the working state of the second fan 2 according to the determination result, so that the second fan 2 can be turned on along with the turning-on of the first fan 1 and turned off along with the turning-off of the first fan 1.
For example, when the fluid characteristic is greater than the preset control threshold, the control switch 4 may control the second fan 2 to be turned on; when the fluid characteristic is smaller than the preset control threshold, the control switch 4 may control the second fan 2 to be turned off.
Further, the preset control threshold may be determined according to the size of the opening cross section of the throat 5 and the respective operating parameters of the first fan 1 and the second fan 2. It is understood by those skilled in the art that when the first fan 1 is turned on and the second fan 2 is also turned on based on the in-line fan system 62 of the present embodiment, due to the suction effect of the second fan 2, the fluid characteristic such as the air pressure of the detection point P1 is reduced, and at this time, it is required to ensure that the fluid characteristic of the detection point P1 is not reduced below the preset control threshold due to the suction effect of the second fan 2 through the characteristics of the two fans (represented by the respective operating parameters of the two fans) and the opening cross-sectional size of the throat 5, so as to avoid the false triggering of the turning off of the second fan 2 and ensure that the first fan 1 and the second fan 2 can form a stable in-line working environment. Preferably, the operating parameter comprises at least power.
Further, the larger the opening section size of the throat 5 is, the smaller the preset control threshold value can be set; the smaller the difference between the respective operating parameters of the first fan 1 and the second fan 2 is, the smaller the preset control threshold can be set. Preferably, when ensuring that the first fan 1 is opened, the second fan 2 can be opened in a linked manner under the lowest starting condition, and reaches a stable operation state after both fans are opened, and when the first fan 1 is closed, the second fan 2 is closed at the same time, the preset control threshold value can be a positive value approaching zero. Ideally, when the working parameters of the first fan 1 and the second fan 2 are completely the same, the preset control threshold may be set to zero theoretically, and the corresponding sectional dimension of the throat 5 may be larger.
Further, when the first fan 1 and the second fan 2 are simultaneously turned on, the larger the opening cross-sectional size of the throat 5 is, the smaller the fluid characteristic of the detection point P1 is, so that a reasonable opening cross-sectional size needs to be designed for the throat 5 to ensure that the first fan 1 and the second fan 2 can form a stable serial working state after being turned on.
Further, the fluid characteristics of the detection point P1 may include any one or any number of the following elements: static pressure, dynamic pressure, full pressure, air volume and flow rate. Those skilled in the art will appreciate that the above physical quantities all have in common that they can be used to measure the airflow flowing condition in the connecting member 3, and by detecting any one or more of these physical quantities, the control switch 4 can timely know the operating state of the first fan 1 (for example, whether the first fan 1 is turned on or off), so as to realize the linkage control of the second fan 2. Alternatively, in addition to the above-mentioned fluid characteristics, a person skilled in the art may determine the control logic for the second fan 2 based on other physical quantities describing the flow characteristics of the air flow, such as the air pressure, the air volume, etc. in the connecting member 3.
Further, the fluid characteristic of the detection point P1 may be an absolute fluid characteristic or a relative fluid characteristic, wherein the relative fluid characteristic is a fluid characteristic expressed with reference to a fluid characteristic outside the connection 3 associated with the detection point P1.
In a preferred embodiment, the control switch 4 may include a pressure switch 41 for detecting a static pressure at the detection point P1 and controlling the operating state of the second fan 2 according to the static pressure. Specifically, the pressure switch 41 may be an existing mechanical pressure switch, and the mechanical pressure switch may turn on or off the power supply of the second fan 2 according to the internal and external static pressure difference at the detection point P1.
For example, the mechanical pressure switch may perform a switching action by a built-in spring, wherein one side of the spring may communicate with the detection point P1 to detect static pressure at the detection point P1 in the connector 3, and the other side of the spring may extend out of the connector 3 and communicate with the atmosphere to detect atmospheric pressure. Further, one end of the pressure switch 41 may be connected to the power line 23 of the second fan 2, the other end of the pressure switch 42 may be connected to a main power source (not shown) of the range hood, and when the pressure switch 41 is closed due to the spring action, the power line 23 of the second fan 2 is connected to the main power source of the range hood; when the spring action causes the pressure switch 41 to open, the power cord 23 of the second fan 2 is disconnected from the main power supply of the range hood.
As a non-limiting example, after the first fan 1 is turned on (at this time, the second fan 2 is still in a static state), the airflow Air enters the connecting member 3, passes through the blocking of the throat 5, the static pressure at the detection point P1 rises to be higher than the atmospheric pressure, and when the difference between the static pressure at the detection point P1 and the atmospheric pressure is greater than the preset control threshold (e.g., a preset static pressure threshold), the spring of the pressure switch 41 acts to control the power line 23 of the second fan 2 to be connected with the main power supply of the range hood, so that the second fan 2 is powered on.
Further, after the first fan 1 is turned off (at this time, the second fan 2 is still in an operating state), the Air flow Air is sucked into the connecting member 3 by the second fan 2, so that the static pressure at the detection point P2 is reduced, and when the difference between the static pressure at the detection point P1 and the atmospheric pressure is smaller than (or equal to) the preset static pressure threshold, the spring of the pressure switch 41 acts again to control the power line 23 of the second fan 2 to be disconnected from the range hood main power supply, so that the second fan 2 is turned off.
The technical personnel in the field understand that, by adopting the series fan system 62 of the embodiment of the invention, the linkage work of each fan in the series fan system 62 can be realized without replacing the original control chip of the range hood to realize the master control of the two fans and additionally adding the control chip of the second fan 2, and the installation operation of the second fan 2 is greatly simplified.
In another preferred example, with reference to fig. 3, the control switch 4 may further include a sensor 42 for acquiring the fluid characteristics of the detection point P1; and a trigger switch 43 in communication with the sensor 42 for controlling the operating state of the second fan 2 according to the fluid characteristics of the detection point P1 collected by the sensor 42. Wherein the sensor 42 may be arranged inside the connector 3 and placed against the inner wall of the connector 3. For example, the sensor 42 may be disposed at the detection point P1 within the connector 3 to more accurately detect the fluid characteristic at the detection point P1.
Further, the trigger switch 43 may be disposed outside the connector 3 and communicate with the sensor 42 to obtain the data collected by the sensor 42 (i.e., the fluid characteristics of the detection point P1).
Further, similar to the pressure switch 41, one end of the trigger switch 43 may also be connected to the power line 23 of the second fan 2, and the other end may be connected to the main power supply of the range hood, and when the trigger switch 43 is closed, the power line 23 of the second fan 2 is connected to the main power supply of the range hood; when the trigger switch 43 is turned on, the power line 23 of the second fan 2 is disconnected from the main power supply of the range hood.
As a non-limiting example, after the first fan 1 is turned on (at this time, the second fan 2 is still in a static state), the airflow Air is pushed into the connecting member 3, the static pressure at the detection point P1 rises due to the blockage of the throat 5, the sensor 42 can collect the static pressure at the detection point P1 in real time and feed back the static pressure to the trigger switch 43, when the static pressure at the detection point P1 rises to be greater than the preset control threshold (e.g., a preset static pressure threshold), the trigger switch 43 is closed, and the power line 23 of the second fan 2 is connected to the range hood main power supply, so that the second fan 2 is powered on.
Further, after the first fan 1 is turned off (at this time, the second fan 2 is still in a working state), an Air flow Air is sucked into the connecting member 3 by the second fan 2, so that the static pressure at the detection point P2 is reduced, and when the static pressure at the detection point P1 collected by the sensor 42 is smaller than (or equal to) the preset static pressure threshold, the trigger switch 43 is turned on to control the power line 23 of the second fan 2 to be disconnected from the range hood main power supply, so that the second fan 2 is turned off.
Further, when the sensor 42 is used for detecting the static pressure at the detecting point P1, the trigger switch 43 may be an electronic pressure switch (not shown), which is different from the above-mentioned mechanical pressure switch in that the electronic pressure switch determines the action of the spring according to the static pressure at the detecting point P1 collected by the sensor 42, thereby controlling the operating state of the second fan 2.
Further, the sensor 42 and the trigger switch 43 can communicate with each other by wire (e.g., data line); or, the two can communicate with each other in a wireless (e.g. bluetooth, WIFI) manner.
In another non-limiting embodiment, the sensor 42 can also be used for detecting the air volume at the detecting point P1, and the trigger switch 43 controls the working state of the second fan 2 according to the air volume at the detecting point P1. For example, when the air volume at the detection point P1 is greater than (or equal to) the preset control threshold (e.g., a preset air volume threshold), it may be determined that the first fan 1 is turned on, and the trigger switch 43 may control the second fan 2 to be turned on in a linkage manner; for another example, when the air volume at the detection point P1 is smaller than the preset control threshold (e.g., a preset air volume threshold), it may be determined that the first fan 1 is turned off, and the trigger switch 43 may control the second fan 2 to be turned off in an interlocking manner.
As a variant, the sensor 42 may also be arranged outside the connector 3 in a manner similar to the pressure switch 41 described above and in communication with the inside of the connector 3 at the detection point P1, so as to accurately detect the fluid characteristics at the detection point P1.
For example, reference may be made to the schematic diagram of the sensor 42 shown in fig. 4, wherein one end of the sensor 42 may extend into the inside of the connector 3, and the other end may communicate with the pipe wall of the connector 3 (to obtain the static pressure at the detection point P1). Further, when the Air flow Air flows in the connecting member 3, the sensor 42 may detect the dynamic pressure at the detecting point P1, and transmit a specific value of the detected dynamic pressure to the trigger switch 43 (not shown). In a non-limiting embodiment, the detecting point P1 may be disposed on the axis of the connecting member 3, and the sensor 42 may detect the dynamic pressure of the detecting point P1 by the height difference h1 generated by the Air flow Air.
For another example, reference may also be made to the schematic diagram of the sensor 42 shown in fig. 5, wherein one end of the sensor 42 may extend into the interior of the connecting member 3, and the other end may be communicated with the atmosphere. Further, when the Air flow Air flows in the connecting member 3, the sensor 42 may detect the full pressure at the detection point P1 and transmit a specific value of the detected full pressure to the trigger switch 43 (not shown). In a non-limiting embodiment, the detecting point P1 may be disposed on the axis of the connecting member 3, and the sensor 42 may detect the dynamic pressure of the detecting point P1 by the height difference h2 generated by the Air flow Air.
Further, those skilled in the art may also adopt other existing solutions to collect the fluid characteristics such as static pressure, dynamic pressure, full pressure, air volume, etc. at the detection point P1 in the connecting piece 3, which does not affect the technical content of the present invention.
As another variation, the sensor 42 may be further disposed at a center of a cross section of the opening where the detecting point P1 is located, so as to accurately detect the flow velocity at the detecting point P1. Further, when the axial direction of the sensor 42 is the same as the flow direction of the Air flow Air, the sensor 42 may also be used to detect the dynamic pressure at the detection point P1. Furthermore, the trigger switch 43 controls the working state of the second fan 2 according to the data (such as the flow rate and the dynamic pressure) collected by the sensor 42, and a specific control logic may refer to the control logic based on the wind pressure and the wind volume, which is not described herein again.
As a further variation, the sensor 42 may also simultaneously acquire a plurality of fluid characteristics of the detection point P1 (for example, simultaneously acquire static pressure and air volume of the detection point P1), and the trigger switch 43 controls the second fan 2 to be turned on when the plurality of fluid characteristics are all greater than respective preset control thresholds; otherwise, the trigger switch 43 controls the second fan 2 to be turned off.
Alternatively, a plurality of sensors 42 may be provided inside and outside the connector 2 to detect a plurality of fluid characteristics of the detection point P1, respectively (for example, dynamic pressure and flow rate of the monitoring point P1 are detected by different sensors 42, respectively).
Further, the first fan 1 and the second fan 2 can share a power cord 23 (as shown in fig. 6), and the power cord 23 can be connected to the main power supply of the range hood; or, the first fan 1 and the second fan 2 may also have independent power lines (as shown in fig. 1), the first fan 1 has an independent power line 12, the second fan 2 has an independent power line 23, and the power line 12 and the power line 23 are connected to the range hood main power supply, respectively.
Further, with reference to fig. 2, the opening cross-sectional size of other portions in the connecting member 3 gradually decreases from the first position 32 on the connecting member 3 to the throat 5, and the first position 32 on the connecting member 3 is located between the air outlet end 11 of the first fan 1 and the throat 5. Those skilled in the art understand that, in the technical solution of this embodiment, the first half section of the connecting member 3 is designed as a tapered pipeline to ensure that the air pressure in the connecting member 3 can be gathered at the detecting point P1 between the throat 5 and the air outlet end 11 of the first fan 1, so as to facilitate the technical solution of this embodiment for controlling the second fan based on the linkage of the first fan.
Furthermore, the opening cross-sectional size of other parts in the connecting piece 3 is gradually increased between the throat 5 and a second position 33 on the connecting piece 3, and the second position 33 on the connecting piece 3 is located between the air inlet end 21 of the second fan 2 and the throat 5.
Those skilled in the art understand that the connecting piece 3 designed by the embodiment of the present invention is beneficial to obtaining a more stable fluid characteristic detection result at the detection point P1, and reduces the influence of the Air flow Air flowing in the connecting piece 3 on the detection result as much as possible, thereby avoiding the misoperation of the control switch 4. Furthermore, the connecting piece 3 is designed in a form that the size of the opening section is reduced firstly and then increased, so that the resistance of a pipe network where the first fan 1 is located can be effectively increased, the pressurization is better realized, and the flow (also called air volume) can be increased.
As a variant, the size of the cross-section of the opening in the other part of the connecting element 3 can also be kept constant. For example, referring to fig. 7, the connecting member 3 may be designed to be a perforated plate structure, so that the overall structure of the series fan system 62 is more compact, and the series fan system 62 adopting the technical scheme of the embodiment of the present invention can be better adapted to range hoods with different sizes.
Further, the distance between the detection point P1 and the throat 5 is determined according to the opening cross-sectional size of the throat 5 and the respective operating parameters (such as power) of the first fan 1 and the second fan 2. Preferably, the closer the distance between the detection point P1 and the throat 5, the more advantageous it is to take the result of the comparison of the fluid characteristics of the detection point P1 with preset control thresholds as the on condition and off condition of the second fan 2; however, the distance between the detection point P1 and the throat 5 cannot be too close, otherwise, both fans may not enter a stable operating state after being turned on. Therefore, a reasonable distance needs to be designed to ensure that the first fan 1 and the second fan 2 can form a stable series working state after being started.
Further, if the series fan system 62 is connected in series with two fans with different operating parameters (such as power), the performance curve of the two fans during series operation is combined, and the size of the opening cross section of the throat 5 is reasonably designed, so that the first fan 1 and the second fan 2 can be ensured to work in a reasonable interval (for example, both work on the left side of the intersection point of the pipe network characteristic curve and the synthetic pressure curve of the first fan), thereby effectively reducing the temperature rise of the respective motors of the two fans during series operation and improving the working efficiency of the whole series fan system 62. Preferably, on the premise of ensuring the exhaust air volume of the series fan system 62, the smaller the opening cross-sectional size of the throat 5, the more the first fan 1 and the second fan 2 can be ensured to work on the left side of the intersection point.
Further, the fan with larger working parameter in the series fan system 62 can be used as the first fan 1, and the fan with smaller working parameter can be used as the second fan 2, so as to better obtain the technical effect of increasing the wind pressure and the exhaust air volume of the range hood based on the series fan system 62.
By the above, by adopting the scheme of the first embodiment, by comprehensively considering several factors, namely, the respective working parameters of the first fan 1 and the second fan 2, the opening section size of the throat 5, the distance between the detection point P1 and the throat 5, and the specific numerical value of the preset control threshold, it is ensured that the finally designed series fan system 62 can realize the linkage work of multiple fans, that is, when the first fan 1 is opened, the second fan 2 can be opened in a linkage manner; when the two fans are both started, the two fans can stably work in a starting state to realize air exhaust; when the first fan 1 is closed, the second fan 2 can be closed in a linkage manner.
Fig. 8 is a schematic view of a range hood 6 according to a second embodiment of the present invention. Specifically, the hood 6 may include a body 61. More specifically, the body 61 is provided with the series fan system 62 shown in fig. 1 to 7.
Further, the series fan system 62 can be set with reference to the placement position of the fan in the existing range hood. For example, the series fan system 62 as a whole may be placed inside the body 61 as shown in fig. 8 to save space.
Or, as a preferred embodiment of this embodiment, referring to fig. 9, the serial fan system 62 may also be disposed inside the body 61, and partially extended out of the body 61 and placed on the range hood 6. For example, as shown in fig. 9, the range hood 6 may have a first fan 1 installed therein, and in order to increase the wind pressure and the exhaust air volume of the range hood, a connecting member 3 and a second fan 2 may be connected to an air outlet end 11 of the first fan 1 to form the series fan system 62. The two ends of the connecting piece 3 are respectively connected with the air outlet end 11 of the first fan 1 and the air inlet end 21 of the second fan 2, so that air flow flows out of the air outlet end 22 from the air outlet end 11 through the connecting piece 3.
For more contents of the working principle and the working mode of the series fan system 62 on the range hood 6, reference may be made to the related descriptions in fig. 1 to 7, which are not described herein again.
Fig. 10 is a schematic structural diagram of a fan system 7 according to a third embodiment of the present invention. Specifically, the fan system 7 may include a fan 2 (i.e., the second fan 2 shown in fig. 1 to 7) and the fan 2 has an air inlet end 21 and an air outlet end 22.
More specifically, the fan system 7 may further include a connecting member 3, and the connecting member 3 is connected to the Air inlet end 21 of the fan 2, so that the Air flow Air flows in from the vacant end 31 of the connecting member 3 and flows into the Air inlet end 21 of the fan 2 through the connecting member 3.
Further, the connector 3 may comprise a control switch 4 for detecting a fluid characteristic of a detection point P1 in the connector 3 and controlling the operating state of the fan 2 according to the fluid characteristic.
Preferably, the connecting piece 3 may further include a throat 5, the opening cross-sectional dimension of the throat 5 is smaller than the opening cross-sectional dimension of other parts in the connecting piece 3, and the detection point P1 is located between the throat 5 and the free end 31 of the connecting piece 3.
Further, the free end 31 of the connector 3 may be configured to be adapted to engage an exhaust port of a range hood. For example, the vacant end 31 of the connecting member 3 may be connected to the air outlet end 11 of the first fan 1 in the embodiment shown in fig. 1 to 7, so as to obtain the serial fan system 62 disposed in the range hood 6 shown in fig. 8 or 9.
Those skilled in the art will appreciate that in practical applications, the fan 2 may be directly connected to a fan of an existing range hood to form the series fan system 62 in the embodiments shown in fig. 1 to 7. Preferably, the fan 2 can be connected with the fan of the existing range hood in an inserting manner; or the fan 2 and the air outlet end of the fan of the existing range hood can also be connected by other modes such as bolt connection and the like.
In a preferred embodiment, the opening cross-sectional size of the other part of the connecting member 3 may gradually decrease from the first position 32 on the connecting member 3 to the throat 5, wherein the first position 32 on the connecting member 3 is located between the empty end 31 and the throat 5.
Further, the opening cross-sectional size of other parts in the connecting member 3 may be gradually increased between the throat 5 and the second position 33, and the second position 33 on the connecting member 3 is located between the air inlet end 21 of the fan 2 and the throat 5.
In a variant, with reference to fig. 11, the size of the cross-section of the opening in the connecting element 3 can also be kept constant elsewhere.
For more contents of the working principle and the working mode of the fan system 7, reference may be made to the related descriptions in fig. 1 to fig. 7, which are not described herein again.
By last, adopt the scheme of third embodiment, fan system 7 can be assembled to current lampblack absorber as an independent spare part to with original fan of lampblack absorber (for example, first fan 1 in the above-mentioned first embodiment) establish ties and constitute the series connection fan system 62 of above-mentioned figure 1-figure 7 to increase the wind pressure and the volume of airing exhaust of current lampblack absorber. Further, by adopting the technical scheme of the embodiment, the original fan of the range hood does not need to be changed in the assembling process, the operation is convenient, the circuit structure of the existing range hood is hardly changed, and the large-scale popularization and application are easy.
Fig. 12 is a connecting member 3 for a range hood according to a fourth embodiment of the present invention. In particular, the connector 3 may comprise a free end 31; a connection end 34; a control switch 4 for detecting a fluid characteristic at a detection point P1 in the connection piece 3, a switch state of the control switch 4 being determined by the fluid characteristic; the opening section size of the throat 5 is smaller than that of other parts in the connecting piece 3; wherein the detection point P1 is located between the throat 5 and the free end 31.
Those skilled in the art understand that in practical application, the connecting piece 3 of the embodiment of the invention can be used as a single part to be assembled on the existing range hood so as to connect two original fans of the range hood in series; or, the connecting piece 3 can also be used for connecting the original fan of the range hood with a newly added fan in series, thereby forming the series fan system 62 shown in the figures 1 to 7, and obtaining the technical effects of increasing the wind pressure and the air exhaust volume of the range hood. For example, the vacant end 31 of the connector 3 may be connected to the first fan 1 described in fig. 1 to 7, and the connection end 34 of the connector 3 may be connected to the second fan 2 described in fig. 1 to 7, so as to form the series fan system 62. Furthermore, the original fan of the range hood is not required to be changed in the assembling process, the operation is convenient, the circuit structure of the range hood is hardly required to be changed, and the large-scale popularization and application are easy.
Preferably, the fan 2 can be connected with the fan of the existing range hood in an inserting manner; or the fan 2 and the air outlet end of the fan of the existing range hood can also be connected by other modes such as bolt connection and the like.
Further, when the fluid characteristic at the detection point P1 is greater than a preset control threshold, it is determined that the control switch 4 is turned on; when the fluid characteristic at the detection point P1 is less than a preset control threshold value, it is determined that the control switch 4 is turned off.
As a variation, the specific structure of the connecting element 3 may also refer to the technical solution shown in fig. 3 or fig. 7, which is not described herein again.
For more details of the working principle and the working mode of the connecting member 3, reference may be made to the description in fig. 1 to 7, which is not repeated herein.
Fig. 13 is a flowchart of a control method of a range hood according to a fifth embodiment of the present invention. The specific structure of the range hood can refer to the range hood 6 shown in fig. 8.
Specifically, the range hood 6 may include a body 61 and a series fan system 62. The specific structure of the series fan system 62 may refer to the technical solutions shown in fig. 1 to 7.
More specifically, referring to fig. 1 to 7, the series fan system 62 of the range hood 6 may include a first fan 1 and a second fan 2, where the first fan 1 is connected to the second fan 2 via a connecting member 3, so that an Air flow Air flowing out of the Air outlet end 11 of the first fan 1 flows into the Air inlet end 21 of the second fan 2 via the connecting member 3.
Further, in this embodiment, the control method of the range hood 6 may be implemented according to the following steps:
step S101, collecting the fluid characteristics of a detection point P1 preset in the connecting piece 3.
And step S102, judging the working state of the first fan 1 according to the fluid characteristics of the detection point P1.
And step S103, controlling the working state of the second fan 2 according to the judgment result, so that the second fan 2 is opened along with the opening of the first fan 1 and is closed along with the closing of the first fan 1.
Further, the fluid characteristics may include any one or any plurality of static pressure, dynamic pressure, full pressure, air volume, flow rate.
Further, the connecting member 3 may include a throat 5, an opening cross-sectional dimension of the throat 5 is smaller than an opening cross-sectional dimension of other portions in the connecting member 3, and the detection point P1 is located between the throat 5 and the air outlet end 1 of the first fan 1.
Preferably, the specific structure of the connecting member 3 may refer to the technical solutions shown in fig. 1 to 12, which are not described herein again.
In a preferred example, the working state of the first fan 1 may be determined according to a comparison result between the fluid characteristic and a preset control threshold. Preferably, when the comparison result shows that the fluid characteristic is greater than the preset control threshold, it is determined that the first fan 1 is in an open state, and the second fan 2 is further controlled to be opened. Or, when the comparison result shows that the fluid characteristic is smaller than the preset control threshold, judging that the first fan 1 is in a closed state, and controlling the second fan 2 to be closed.
For example, after the first fan 1 is turned on, the control switch 4 (for example, the pressure switch 41) senses that the air pressure at the detection point P1 increases, and when the air pressure at the detection point P1 increases to a value that the difference between the air pressure at the position outside the connecting member 3 and the air pressure at the position corresponding to the detection point P1 is greater than the preset control threshold (for example, a preset air pressure threshold), the control switch 4 is closed to connect the connection between the power supply of the second fan 2 and the main power supply of the range hood 6, so that the second fan 2 is turned on. Further, after the first fan 1 is turned off, the control switch 4 (for example, the pressure switch 41) senses that the air pressure at the detection point P1 is reduced, and when the air pressure at the detection point P1 is reduced to a value that the difference between the air pressure at the position corresponding to the detection point P1 outside the connecting member is smaller than (or equal to) the preset control threshold (for example, a preset air pressure threshold), the control switch 4 is turned on to disconnect the connection between the power supply of the second fan 2 and the main power supply of the range hood 6, so that the second fan 2 is powered off and stops working.
For another example, after the first fan 1 is turned on, the sensor 42 of the control switch 4 collects the air volume of the detection point P1 in the connecting member 3 in real time and feeds the air volume back to the trigger switch 43, and when the air volume of the detection point P1 received by the trigger switch 43 rises to be greater than the preset control threshold (for example, a preset air volume threshold), the trigger switch 4 acts to connect the power supply of the second fan 2 to the main power supply of the range hood 6, so that the second fan 2 is turned on. Further, after the first fan 1 is turned off, the sensor 42 of the control switch 4 continuously collects the air volume of the detection point P1 in the connecting piece 3 and feeds the air volume back to the trigger switch 43, and when the air volume of the detection point P1 received by the trigger switch 43 drops to be smaller than the preset control threshold (for example, a preset air volume threshold), the trigger switch 4 acts to disconnect the connection between the power supply of the second fan 2 and the main power supply of the range hood 6, so that the second fan 2 is turned off.
For more contents of the working principle and the working mode of the range hood 6, reference may be made to the related descriptions in fig. 1 to 7, which are not described herein again.
By last, adopt the scheme of fifth embodiment, need not for second fan 2 designs special circuit control logic, but can be through discernment first fan 1's operating condition comes the operating condition of automatic control second fan 2, in order to ensure linkage work that two fans in the lampblack absorber 6 can be automatic to realize the technological effect of the wind pressure and the volume of airing exhaust of increase lampblack absorber.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (13)
1. A series fan system (62) for a range hood, comprising:
a first fan (1);
a second fan (2);
the two ends of the connecting piece (3) are respectively connected with the air outlet end (11) of the first fan (1) and the air inlet end (21) of the second fan (2), so that the air flow flowing out of the air outlet end (11) of the first fan (1) flows into the air inlet end (21) of the second fan (2) through the connecting piece (3);
wherein the connector (3) comprises a control switch (4) for detecting a fluid characteristic of a detection point (P1) in the connector (3) and controlling the working state of the second fan (2) according to the fluid characteristic, so that the second fan (2) is turned on along with the turning-on of the first fan (1) and is turned off along with the turning-off of the first fan (1);
the connecting piece (3) further comprises a throat (5), the opening section size of the throat (5) is smaller than the opening section sizes of other parts in the connecting piece (3), and the detection point (P1) is located between the throat (5) and the air outlet end (11) of the first fan (1).
2. The series fan system (62) of claim 1, wherein the control switch (4) controls the operating state of the second fan (2) as a function of the comparison of the fluid characteristic with a preset control threshold;
wherein the control switch (4) controls the second fan (2) to be turned on when the fluid characteristic is greater than the preset control threshold; when the fluid characteristic is smaller than the preset control threshold value, the control switch (4) controls the second fan (2) to be turned off.
3. The tandem fan system (62) of claim 1, wherein the fluid characteristics of the detection point (P1) include any one or more of the following elements: static pressure, dynamic pressure, full pressure, air volume and flow rate.
4. The tandem fan system (62) according to claim 1, wherein the control switch (4) comprises:
and the pressure switch (41) is used for detecting the static pressure of the detection point (P1) and controlling the working state of the second fan (2) according to the static pressure.
5. The tandem fan system (62) according to claim 1, wherein the control switch (4) comprises:
a sensor (42) for acquiring fluid characteristics of the detection point (P1);
a trigger switch (43) in communication with said sensor (42) for controlling the operating state of said second fan (2) in accordance with the fluid characteristics of said detection point (P1) acquired by said sensor (42).
6. The series fan system (62) of claim 1, wherein the first fan (1) and the second fan (2) share a power supply line; or the first fan (1) and the second fan (2) are respectively provided with an independent power line.
7. The tandem fan system (62) according to claim 1, wherein the opening cross-sectional size of the other part of the connector (3) is gradually reduced from the first position (32) on the connector (3) to the throat (5), and the first position (32) on the connector (3) is located between the air outlet end (11) of the first fan (1) and the throat (5).
8. The tandem fan system (62) according to claim 7, wherein the opening cross-sectional size of the other portion of the connector (3) is gradually increased between the throat (5) and a second location (33) on the connector (3), the second location (33) on the connector (3) being located between the air intake end (21) of the second fan (2) and the throat (5).
9. The tandem fan system (62) according to claim 1, wherein the opening cross-sectional size remains constant elsewhere in the connector (3).
10. The tandem fan system (62) according to any of claims 1-9, wherein the fluid characteristic of the detection point (P1) is an absolute fluid characteristic or a relative fluid characteristic, wherein the relative fluid characteristic is a fluid characteristic expressed with reference to a fluid characteristic outside the connection (3) associated with the detection point (P1).
11. A range hood (6) comprising a body (61), characterized in that the body (61) is provided with a series fan system (62) according to any one of claims 1 to 10.
12. The utility model provides a control method of lampblack absorber (6), lampblack absorber (6) include first fan (1) and second fan (2), first fan (1) with second fan (2) are connected via connecting piece (3) to make the air current that air-out end (11) of first fan (1) flow in air-in end (21) of second fan (2) via connecting piece (3), its characterized in that includes:
acquiring fluid characteristics of a detection point (P1) preset in the connecting piece (3);
judging the working state of the first fan (1) according to the fluid characteristics of the detection point (P1);
controlling the working state of the second fan (2) according to the judgment result so that the second fan (2) is opened along with the opening of the first fan (1) and is closed along with the closing of the first fan (1);
the connecting piece (3) comprises a throat (5), the opening section size of the throat (5) is smaller than that of other parts in the connecting piece (3), and the detection point (P1) is located between the throat (5) and the air outlet end (11) of the first fan (1).
13. The utility model provides a control method of lampblack absorber (6), lampblack absorber (6) include first fan (1) and second fan (2), first fan (1) with second fan (2) are connected via connecting piece (3) to make the air current that air-out end (11) of first fan (1) flow in air-in end (21) of second fan (2) via connecting piece (3), its characterized in that includes:
acquiring fluid characteristics of a detection point (P1) preset in the connecting piece (3);
judging the working state of the first fan (1) according to the fluid characteristics of the detection point (P1);
controlling the working state of the second fan (2) according to the judgment result so that the second fan (2) is opened along with the opening of the first fan (1) and is closed along with the closing of the first fan (1);
the judging the working state of the first fan (1) according to the fluid characteristics of the detection point (P1) comprises the following steps: judging the working state of the first fan (1) according to the comparison result of the fluid characteristic and a preset control threshold value; when the comparison result shows that the fluid characteristic is larger than the preset control threshold value, judging and determining that the first fan (1) is in an open state; when the comparison result shows that the fluid characteristic is smaller than the preset control threshold value, judging and determining that the first fan (1) is in a closed state;
the controlling the working state of the second fan (2) according to the judgment result comprises the following steps: when the judgment result shows that the first fan (1) is in an open state, controlling the second fan (2) to be opened; otherwise, controlling the second fan (2) to be closed.
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| CN201710549457.1A CN109209959B (en) | 2017-07-06 | 2017-07-06 | Range hood, series fan system thereof, control method, connecting piece and fan system |
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| CN201710549457.1A CN109209959B (en) | 2017-07-06 | 2017-07-06 | Range hood, series fan system thereof, control method, connecting piece and fan system |
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| CN109209959B true CN109209959B (en) | 2021-08-31 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6186744B1 (en) * | 1996-10-12 | 2001-02-13 | Synetics Solutions Inc. | Volumetric airflow indicator and control device |
| GB2409263A (en) * | 2003-11-10 | 2005-06-22 | Blaise Ford | Automatic ventilation system |
| CN100526654C (en) * | 2005-11-24 | 2009-08-12 | 台达电子工业股份有限公司 | Fan system and its orderly start module and delayed start unit |
| CN202991568U (en) * | 2013-01-05 | 2013-06-12 | 吕键茹 | Main mine induced draft fan with air-volume online detection device |
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