CN111134577A - Fan control method and system - Google Patents
Fan control method and system Download PDFInfo
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- CN111134577A CN111134577A CN202010006720.4A CN202010006720A CN111134577A CN 111134577 A CN111134577 A CN 111134577A CN 202010006720 A CN202010006720 A CN 202010006720A CN 111134577 A CN111134577 A CN 111134577A
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- control
- fan
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
- A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
- A47L9/2836—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means characterised by the parts which are controlled
- A47L9/2842—Suction motors or blowers
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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
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The invention provides a fan control method and system. The control method comprises the following steps: the control circuit receives a control instruction of the controller; and triggering at least part of control elements in the control circuit to be opened and/or closed according to the control instruction, so that the current in at least one coil of the fan flows in the reverse direction. The method can shorten the shutdown time of the fan and realize sudden shutdown.
Description
Technical Field
The invention relates to the technical field of fans, in particular to a fan control method and system.
Background
The working principle of the dust collector is that the fan drives the impeller to rotate, work is done on air, the air in the dust collecting barrel is pumped out, pressure difference is formed between the inside of the barrel and the atmospheric pressure, and therefore objects around the air inlet are sucked into the dust collecting barrel. In the existing dust collector, a pre-filter is arranged between a fan and a cyclone separator and is used for filtering air flow entering the fan from the cyclone separator. When the fan is powered off and stopped, the air separation efficiency in the cyclone separator is reduced along with the reduction of the rotating speed of the fan, so that dust passes through the pre-filter due to the reduction of the separation efficiency under the action of the suction force of the fan in the stopping process, the reduction of the rotating speed of the fan weakens the suction force of the fan, a large amount of dust is not enough to pass through the pre-filter and is attached to the pre-filter, and the cleaning efficiency of secondary work is influenced.
Therefore, in the long research and development, the inventor has conducted a lot of research on how to prevent dust from adhering to the front filter during shutdown, and has proposed a fan control method and system to solve one of the above technical problems.
Disclosure of Invention
The present invention is directed to a method and a system for controlling a fan, which can solve at least one of the above-mentioned problems. The specific scheme is as follows:
according to a specific implementation manner of the present invention, in a first aspect, the present invention provides a fan control method, including: the control circuit receives a control instruction of the controller; and triggering at least part of control elements in the control circuit to be opened and/or closed according to the control instruction, so that the current in at least one coil of the fan flows in the reverse direction.
Optionally, all coils of the fan are connected end to form a closed loop; and the connection points of every two adjacent coils are respectively connected with one end of each of the two control elements, and the other ends of the two control elements are respectively connected with the anode and the cathode of the battery.
Optionally, the triggering, according to the control instruction, opening and/or closing of at least part of control elements in the control circuit to reversely circulate a current in at least one coil of the fan includes: controlling the battery to stop supplying power to all coils of the fan; and controlling at least part of the control elements to be opened and/or closed to enable current in part of the coils to flow in the reverse direction, so that reverse electric potential energy generated in the shutdown process of the fan charges the battery.
Optionally, before the control circuit receives the control instruction of the controller, the method further includes: the controller monitors the angular position of a rotor relative to a stator in the fan and forms a control command according to the angular position of the rotor.
Optionally, the triggering, according to the control instruction, opening and/or closing of at least part of control elements in the control circuit to reversely circulate a current in at least one coil of the fan includes: and controlling part of the control elements to be opened and/or closed according to the control instruction so as to lead the battery to lead reverse current to part of the coils.
Optionally, the control circuit further includes two parallel control switches: a first switch and a second switch, the control switch being disposed on a current path between the battery and the control element; the method further comprises the following steps: controlling the first switch to close when the battery consumes the electric energy; or, when charging the battery, the second switch 2 is controlled to be closed.
Optionally, the method further includes: when the fan is started, at least part of the control elements are controlled to be opened and/or closed, and meanwhile the power supply current of the coil is increased.
According to a second aspect of the present invention, there is provided a fan control system for a vacuum cleaner, the fan control system comprising a controller and a control circuit;
the control circuit is connected with the controller and used for receiving a control instruction of the controller; and triggering at least part of control elements in the control circuit to be opened and/or closed according to the control instruction, so that the current in at least one coil of the fan flows in the reverse direction.
Optionally, all coils of the fan are connected end to form a closed loop; and the connection points of every two adjacent coils are respectively connected with one end of each of the two control elements, and the other ends of the two control elements are respectively connected with the anode and the cathode of the battery.
Optionally, the control circuit further includes two parallel control switches: a first switch and a second switch, the control switch being disposed on a current path between the battery and the control element; the control switch is used for controlling the battery to be in a power consumption state or a charging state.
Optionally, the control element is one or more of a metal-oxide semiconductor field effect transistor, a junction field effect transistor, a triode or a thyristor.
Compared with the prior art, the scheme of the embodiment of the invention changes the current direction of the coil through the control element, can shorten the shutdown time, and realizes the rapid shutdown of the fan; in addition, the airflow separation efficiency of the cyclone separator can be improved; furthermore, frequent replacement or cleaning of the pre-filter is avoided, and the cleaning efficiency of the dust collector can be improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
fig. 1 is a schematic structural diagram of a fan control system according to an embodiment of the present invention;
fig. 2 is a schematic view of a working state of the fan motor according to the embodiment of the present invention;
fig. 3 is a circuit structure diagram of a first switch and a second switch in a control circuit according to another embodiment of the present invention;
fig. 4 is a schematic flow chart of a fan control method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe … … in embodiments of the present invention, these … … should not be limited to these terms. These terms are used only to distinguish … …. For example, the first … … can also be referred to as the second … … and similarly the second … … can also be referred to as the first … … without departing from the scope of embodiments of the present invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
For the sake of understanding, a specific application scenario of the embodiment of the present application is first described below.
The vacuum cleaner provided by the embodiment of the application comprises but is not limited to an upright vacuum cleaner, a horizontal vacuum cleaner, a handheld vacuum cleaner, an automatic vacuum cleaner (such as a sweeping robot) and the like. The basic structure of the dust collector comprises a fan, a cyclone separator, a pre-filter and a dust collecting barrel. The cyclone separator is positioned in the dust collection barrel, and in the process that the fan sucks external dust into the dust collection barrel, the cyclone separator separates air and dust, so that the air enters the fan, and the dust falls into the dust collection barrel, thereby realizing dust removal.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a fan control system according to an embodiment of the present invention, where the fan control system can be applied to a vacuum cleaner. Specifically, the fan control system includes: a controller 10 and a control circuit 20; the control circuit 20 is connected to the controller 10, and is configured to receive a control instruction of the controller 10; and according to the control instruction, at least part of control elements in the control circuit 20 is triggered to open and/or close, so that the current in at least one coil of the fan flows in the reverse direction.
In practical applications, the blower includes a motor having three stators and a rotor, as shown in fig. 2, a coil a is diffracted from a first stator; the coil B is diffracted in a second fixed B; the coil C is diffracted on the third stator. The start and stop of the rotor can be realized by controlling the energization of any two groups of coils and the non-energization of the other group of coils. It should be noted that, in the embodiment of the present invention, the coils A, B, C are respectively connected to the control circuit 20, and the controller 10 controls the current in at least a part of the coils by controlling the opening and/or closing of the control element, so as to start and stop the motor. Optionally, the controller 10 is an MCU (micro controller Unit) or an AP (electronic arithmetic processor).
In the embodiment of the invention, all coils of the fan are connected end to form a closed loop; and one ends of the two control elements are respectively connected to the connection points of every two adjacent coils, and the other ends of the two control elements are respectively connected with the positive electrode and the negative electrode of the battery 30. It can be understood that the number of control elements in the control circuit is twice of the number of the fan coils. As an example, referring to fig. 1, when the fan includes three coils, the control circuit includes six control elements (reference numerals 1 to 6), wherein the control element 1 is connected in series with the control element 2, the control element 3 is connected in series with the control element 4, and the control element 5 is connected in series with the control element 6; the control circuit further comprises a node U between the control elements 1 and 2, a node V between the control elements 3 and 4, a node W between the control elements 5 and 6; coil a is located between node U and node V, coil B is located between node V and node W, and coil C is located between node W and node U. The control elements 1, 3, 5 share a positive supply and the control elements 2, 4, 6 share a negative supply.
Based on the control circuit, when the fan is stopped, the sudden stop of the motor within a specified time can be realized by changing the current direction of at least part of the coils, and optionally, the specified time is less than 1 second. In practical application, at least the following two modes exist for stopping the fan:
a first possible implementation: applying a reverse current to the coil prevents the rotor from rotating, causing the motor to come to a sudden stop. Specifically, when the control circuit 20 is in operation, the control element 1 and the control element 4 are turned on, and the current in the coil a flows from U to V; turning on the control element 1 and the control element 6, and enabling current in the coil C to flow from U to W; turning on the control element 3 and the control element 2, and enabling the current in the coil A to flow from V to U; turning on the control element 3 and the control element 6, the current in the coil B flows from V to W; the control element 5 and the control element 2 are switched on, and the current in the coil C flows from W to U; turning on the control element 5 and the control element 4, the current in the coil B flows from W to V; and the process is repeated in cycles. Therefore, part of the control elements can be switched on according to actual requirements to change the current direction of the corresponding coil, so that the current flows reversely along the original current direction.
Preferably, the control element is a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) having a gate, a source, and a drain. The six control elements may be of the same type or different types, for example, the control element 1 is a triode, and the control elements 2 to 6 are all MOSFET tubes. Preferably, the six control elements are all of the same type of device, which enables convenient and rapid control.
In the control circuit 20, if the six control elements are all identical MOSFET tubes, the controller 10 is respectively connected to the gates of 6 MOSFET tubes, and is configured to provide the same or different control signals to the gates of the 6 MOSFET tubes, so as to open or close each MOSFET tube when the drain-source voltage of the MOSFET tube is substantially zero. Of course, the control element is not limited to the MOSFET, and may be a device using an electric field control circuit in the prior art, such as a Junction Field Effect Transistor (JFET), a triode, or a thyristor.
A second possible implementation: when the fan is stopped, the original electrified coil can generate reverse electromotive force, and sudden stop can be realized by recovering electric energy generated by the reaction electromotive force. Specifically, the battery is controlled to stop supplying power to the coil, and at this time, the coil functions as a generator to generate current to flow to the battery 30. In this embodiment, the battery 30 needs to have both discharge capability and storage capability, and optionally, the battery 30 is a rechargeable battery.
In some possible designs, to achieve the above energy recovery, the control circuit may further include two parallel control switches: a first switch S1 and a second switch S2. As shown in fig. 3, the control switch is disposed on a current path between a power supply and the control element; the first switch controls the current to flow in the forward direction, and the second switch controls the current to flow in the reverse direction. Specifically, when the battery consumes electric energy, the first switch is controlled to be closed; or, when the battery is charged, the second switch is controlled to be closed.
In practical application, in the process of recovering the electric energy generated by the back electromotive force, the second switch S2 is controlled to be closed, and the two MOSFET tubes at the two ends of the original energizing coil are controlled to be opened, so that the current flows out from the two ends of the coil and respectively flows into the positive electrode and the negative electrode of the power supply 30, and the battery is reversely charged. Of course, the reverse charging of the battery is not limited to the control of the switch, and may be realized by a MOSFET tube or other means.
It should be noted that the control switch may also be used when a reverse current is applied to the coil, for example, the first switch S1 is controlled to be closed, and two MOSFET transistors at two ends of a certain coil are controlled to be opened, so that a current flows from the positive pole of the power supply 30 to the coil through the first switch S1, and finally to the negative pole of the power supply 30.
Further, the controller may also control the output current of the battery, thereby controlling the supply current of the coil. When the fan is started, the fan can be started within a specified time by increasing the power supply current of the coil. Preferably, the specified time is less than 500 milliseconds.
Finally, the fan control system provided by the embodiment of the present invention changes the current direction of at least some of the coils in the control circuit 20 by connecting two control elements to two ends of each coil, respectively, and opening and/or closing at least some of the control elements, so as to shorten the shutdown time and realize the shutdown of the fan within a specified time; in addition, the airflow separation efficiency of the cyclone separator can be improved; furthermore, frequent replacement or cleaning of the pre-filter is avoided, and the cleaning efficiency of the dust collector can be improved.
Based on the fan control system provided by the embodiment, the embodiment of the invention also provides a control method of the fan control system. As shown in fig. 4, the fan control method specifically includes the following steps:
s11, the control circuit receives the control instruction of the controller;
in practical application, the controller stores a plurality of control instructions in advance, and sends corresponding control instructions to the control circuit according to user operation. All coils of the fan in the control circuit are connected end to form a closed loop; and the connection points of every two adjacent coils are respectively connected with one end of each of the two control elements, and the other ends of the two control elements are respectively connected with the anode and the cathode of the battery.
It should be noted that the controller controls the opening and closing of the control elements in the control circuit, for example, when the control elements are all MOSFET transistors, the controller provides a control signal to the gate of at least a part of the control elements to open or close the MOSFET transistors when the drain-source voltage of the MOSFET is substantially zero. In addition, the controller can control the power supply to supply power to and cut off power from part of the coils.
And S12, triggering at least part of control elements in the control circuit to open and/or close according to the control instruction, and enabling the current in at least one coil of the fan to flow in the reverse direction.
When the fan is stopped, the motor can be suddenly stopped within a specified time, optionally, the specified time is less than 1 second, by changing the current direction of at least part of the coil. In practical applications, at least two ways exist in step S12:
in a first possible way, during the gradual stopping of the rotor, the current in the two energized coils is also gradually reduced, at which time the two coils generate a back electromotive force, which is dissipated by the heating of the coils themselves in the prior art, but the heat dissipation process is slow. Therefore, in order to rapidly consume the back electromotive force of the coil, energy recovery can be realized. Specifically, step S12 includes:
controlling the battery to stop supplying power to all coils of the fan; and controlling at least part of the control elements to be opened and/or closed to enable current in part of the coils to flow in the reverse direction, so that reverse electric potential energy generated in the shutdown process of the fan charges the battery.
Based on the above control circuit structure, the battery can be charged by closing the control elements 1, 3, 5 and turning on the control elements 2, 4, 6. Preferably, two parallel control switches are provided in the current path between the battery and the control element: the first switch and the second switch are used for realizing reverse charging of the battery. Specifically, when the battery consumes electric energy, the first switch is controlled to be closed; or, when charging the battery, the second switch 2 is controlled to be closed.
In practical application, when the electric energy generated by the back electromotive force is recovered, the second switch S2 is controlled to be closed, and the two MOSFET tubes at the two ends of the original energizing coil are controlled to be opened, so that the current flows out from the two ends of the coil and respectively flows into the positive electrode and the negative electrode of the power supply 30, and the battery is reversely charged.
In a second possible way, the rotor can be prevented from moving by applying a reverse force during the gradual stopping of the rotor, so that the rotor can be prevented from moving by applying reverse currents to the two groups of coils which are electrified originally. Specifically, before step S11, the method further includes:
the controller monitors the angular position of a rotor in the fan relative to a stator and forms a control command according to the angular position of the rotor; step S12 specifically includes:
and controlling part of the control elements to be opened and/or closed according to the control instruction so as to lead the battery to lead reverse current to part of the coils.
In practical applications, the method for monitoring the angular position of the rotor in the wind turbine is not limited, for example, a punctuation may be set in the rotor, and the angle rotated by the punctuation is calculated according to parameters such as the rotation speed, so that the two coils currently corresponding to the rotor can be known. Specifically, continuing with fig. 1, controlling the current of the two coils to flow in opposite directions includes: turning on the control element 1 and the control element 4, and enabling current in the coil A to flow from U to V; turning on the control element 1 and the control element 6, and enabling current in the coil C to flow from U to W; turning on the control element 3 and the control element 2, and enabling the current in the coil A to flow from V to U; turning on the control element 3 and the control element 6, the current in the coil B flows from V to W; the control element 5 and the control element 2 are switched on, and the current in the coil C flows from W to U; turning on the control element 5 and the control element 4, the current in the coil B flows from W to V; and the process is repeated in cycles.
In another embodiment of the present invention, when the fan is started, the rotation speed of the fan is increased to the operating rotation speed at a low acceleration, and dust may adhere to the pre-filter in the process, which affects the efficiency of the subsequent re-operation, so the control method may further include:
and S13, when the fan is started, controlling at least part of the control elements to be opened and/or closed, and simultaneously increasing the power supply current of the coil.
It should be noted that the controller may control the output current of the battery. In practical application, if the fan is restarted, the controller controls the first switch to be closed and controls the partial control elements to be opened at the moment, so that the coil generates current; and meanwhile, the controller controls to increase the power supply current of the partial coils, and at the moment, the speed of cutting the magnetic induction lines becomes fast, so that the fan is quickly started within a specified time. Preferably, the specified time is less than 500 milliseconds.
Finally, the fan control method provided by the embodiment of the invention shortens the shutdown time by controlling the on and off of the control element in the control circuit so as to realize the rapid shutdown of the fan, thereby improving the airflow separation efficiency of the cyclone separator; in addition, frequent replacement or cleaning of the pre-filter can be avoided; further, the cleaning efficiency of the cleaner can be improved.
Finally, it should be noted that: the embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The system or the device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The above examples are only intended to illustrate the technical solutions of the present disclosure, not to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present disclosure.
Claims (10)
1. A fan control method is characterized by comprising the following steps:
the control circuit receives a control instruction of the controller;
and triggering at least part of control elements in the control circuit to be opened and/or closed according to the control instruction, so that the current in at least one coil of the fan flows in the reverse direction.
2. The method of claim 1, wherein all coils of the wind turbine are connected end-to-end to form a closed loop; and the connection points of every two adjacent coils are respectively connected with one end of each of the two control elements, and the other ends of the two control elements are respectively connected with the anode and the cathode of the battery.
3. The method of claim 2, wherein triggering the opening and/or closing of at least some control elements in the control circuit according to the control command to reverse the current flow in at least one coil of the wind turbine comprises:
controlling the battery to stop supplying power to all coils of the fan;
and controlling at least part of the control elements to be opened and/or closed to enable current in part of the coils to flow in the reverse direction, so that reverse electric potential energy generated in the shutdown process of the fan charges the battery.
4. The method of claim 2, wherein before the control circuit receives the control instruction of the controller, the method further comprises:
the controller monitors the angular position of a rotor relative to a stator in the fan and forms a control command according to the angular position of the rotor.
5. The method of claim 4, wherein triggering the opening and/or closing of at least some control elements in the control circuit according to the control command to reverse the current flow in at least one coil of the wind turbine comprises:
and controlling part of the control elements to be opened and/or closed according to the control instruction so as to lead the battery to lead reverse current to part of the coils.
6. The method of claim 3 or 5, wherein the control circuit further comprises two parallel control switches: a first switch and a second switch, the control switch being disposed on a current path between the battery and the control element; the method further comprises the following steps:
controlling the first switch to close when the battery consumes the electric energy; or the like, or, alternatively,
and controlling the second switch to be closed when the battery is charged.
7. The method of claim 1, further comprising:
when the fan is started, at least part of the control elements are controlled to be opened and/or closed, and meanwhile the power supply current of the coil is increased.
8. A fan control system is applied to a dust collector and is characterized by comprising a controller and a control circuit;
the control circuit is connected with the controller and used for receiving a control instruction of the controller; and triggering at least part of control elements in the control circuit to be opened and/or closed according to the control instruction, so that the current in at least one coil of the fan flows in the reverse direction.
9. The system of claim 8, wherein all coils of the fan are connected end-to-end to form a closed loop; and the connection points of every two adjacent coils are respectively connected with one end of each of the two control elements, and the other ends of the two control elements are respectively connected with the anode and the cathode of the battery.
10. The system of claim 9, wherein the control circuit further comprises two parallel control switches: a first switch and a second switch, the control switch being disposed on a current path between the battery and the control element; the control switch is used for controlling the battery to be in a power consumption state or a charging state.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010006720.4A CN111134577B (en) | 2020-01-03 | 2020-01-03 | Fan control method and system |
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| CN202010006720.4A CN111134577B (en) | 2020-01-03 | 2020-01-03 | Fan control method and system |
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| CN111134577A true CN111134577A (en) | 2020-05-12 |
| CN111134577B CN111134577B (en) | 2021-08-24 |
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| CN204794197U (en) * | 2015-07-02 | 2015-11-18 | 宁波摩米创新工场电子科技有限公司 | Battery automatic control circuit that charges |
| JP2017158915A (en) * | 2016-03-11 | 2017-09-14 | 東芝ライフスタイル株式会社 | Vacuum cleaner |
| CN107917095A (en) * | 2017-10-31 | 2018-04-17 | 广东金力变速科技股份有限公司 | A kind of brush-less fan of strap brake function |
| CN209494742U (en) * | 2019-02-18 | 2019-10-15 | 江苏美的清洁电器股份有限公司 | Blower and dust catcher with it |
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Effective date of registration: 20220616 Address after: 1802, building D1, Nanshan Zhiyuan, No. 1001, Xueyuan Avenue, Changyuan community, Taoyuan Street, Nanshan District, Shenzhen, Guangdong 518000 Patentee after: Shenzhen Luoke Innovation Technology Co.,Ltd. Address before: No. 6016, 6017 and 6018, Block C, No. 8 Heiquan Road, Haidian District, Beijing 100085 Patentee before: Beijing Roborock Technology Co.,Ltd. |