CN110040610B - Elevator car fan control device and vertical elevator - Google Patents
Elevator car fan control device and vertical elevator Download PDFInfo
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- CN110040610B CN110040610B CN201910353786.8A CN201910353786A CN110040610B CN 110040610 B CN110040610 B CN 110040610B CN 201910353786 A CN201910353786 A CN 201910353786A CN 110040610 B CN110040610 B CN 110040610B
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- fan
- elevator car
- elevator
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 238000004146 energy storage Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B11/00—Main component parts of lifts in, or associated with, buildings or other structures
- B66B11/02—Cages, i.e. cars
- B66B11/0226—Constructional features, e.g. walls assembly, decorative panels, comfort equipment, thermal or sound insulation
- B66B11/024—Ventilation systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B50/00—Energy efficient technologies in elevators, escalators and moving walkways, e.g. energy saving or recuperation technologies
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Elevator Control (AREA)
Abstract
The invention discloses an elevator car fan control device and a vertical elevator, wherein the elevator car fan control device comprises a first trigger switch and a switch state conversion circuit; the first trigger switch is electrically connected with the fan; the switch state conversion circuit comprises a signal acquisition unit, a conversion unit and a control unit; the signal acquisition unit is used for acquiring working states of the door opening switch and the door closing switch; the control unit is electrically connected with the first trigger switch; when the signal acquisition unit detects that the door opening switch and the door closing switch are simultaneously operated, the conversion unit converts and maintains the control signal output by the control unit; according to the elevator car fan control device, the original door opening switch and door closing switch in the elevator car are utilized to control the fan, other switches for controlling the fan are not required to be installed in openings in the elevator car, passengers are facilitated, the existing structure of the elevator car interior is not damaged, and user experience can be effectively improved.
Description
Technical Field
The invention relates to the technical field of elevator control, in particular to an elevator car fan control device convenient for passengers to control independently and a vertical elevator.
Background
In order to provide passengers with a comfortable elevator riding environment, fans are generally arranged in the elevator car to blow fresh air flow or cool air flow outside into the elevator car, but the fans in the elevator car are generally controlled automatically by a system, the passengers cannot control the opening and closing of the fans, and the fans are generally in an opening or closing state (during elevator running) for a long time. When the passenger feels cold, the fan cannot be turned off; when the passenger feels stuffy, the fan cannot be turned on. This contradiction is particularly evident in seasons where the temperature difference between day and night is large.
If, as is conventional, a switch is added to the car to control the fan, the switch needs to be installed in the car. The newly added switch needs to be provided with holes on the wall of the car, which will destroy the aesthetic degree of the car decoration, especially in the occasions such as villa elevators, etc.
Disclosure of Invention
The invention aims to solve the technical problems and provide the elevator car fan control device which is convenient for passengers to control autonomously and does not damage the inner wall of the existing elevator car.
Another object of the present invention is to provide a vertical elevator which is convenient for passengers to control the on/off of the fan independently and does not damage the inner wall of the existing elevator car in order to solve the above-mentioned technical problems.
In order to achieve the above-mentioned purpose, the invention discloses a fan control device of elevator car, which is used for controlling the working state of a fan installed in the elevator car, wherein a door opening switch and a door closing switch electrically connected with an elevator control system are installed in the elevator car, and the fan control device of elevator car comprises a first trigger switch and a switch state conversion circuit; the first trigger switch is electrically connected with the fan and used for switching the on/off state of the fan; the switch state conversion circuit comprises a signal acquisition unit, a conversion unit and a control unit; the signal acquisition unit is used for acquiring working states of the door opening switch and the door closing switch; the control unit is electrically connected with the first trigger switch and is used for controlling the working state of the first trigger switch; when the signal acquisition unit detects that the door opening switch and the door closing switch are simultaneously operated, the conversion unit converts and maintains the control signal output by the control unit.
Compared with the prior art, the elevator car fan control device is provided with the first trigger switch electrically connected with the fan, the on/off of the first trigger switch is controlled by the on/off signal output by the control unit in the switch state conversion circuit, when a passenger needs to change the working state of the fan, the control signal output by the control unit can be converted by the signal acquisition unit and the conversion unit only by simultaneously pressing the door opening switch and the door closing switch in the elevator car, namely, the control signal output by the control unit is converted between on and off once when the door opening switch and the door closing switch are simultaneously operated once, and the conversion result is kept, so that the aim of converting the working state of the fan is achieved; therefore, the fan control device for the elevator car can control the fan through the original door opening switch and door closing switch in the elevator car, and other switches for controlling the fan do not need to be installed in holes in the elevator car, so that passengers are facilitated, the existing structure of the elevator car interior can not be damaged, and the user experience can be effectively improved.
Preferably, the control unit includes a first relay, and the first relay is used for switching the working state of the first trigger switch.
Preferably, the signal acquisition unit comprises a second trigger switch and a third trigger switch which are respectively connected with the conversion unit in series, when the door opening switch is operated, the working state of the second trigger switch is converted, and when the door closing switch is operated, the working state of the third trigger switch is converted.
Preferably, the elevator car fan control device further comprises a second relay and a third relay which are respectively used for driving the second trigger switch and the third trigger switch to change working states, the door opening switch is connected in series in a power circuit of the second relay, the door closing switch is connected in series in the power circuit of the third relay, and the second relay and the third relay are further respectively electrically connected with the elevator control system through a pair of normally open contacts.
Preferably, the switching unit comprises a fourth relay and a fifth relay, wherein a normally closed contact of the first relay is connected in parallel with a normally open contact of the fourth relay and then connected in series with a normally closed contact of the fifth relay in a power supply loop of the fourth relay; a normally open contact of the first relay is connected in parallel with a normally open contact of the fifth relay and then connected in series with a normally closed contact of the fourth relay in a power supply loop of the fifth relay; and a normally open contact of the first relay is connected in parallel with a normally open contact of the fourth relay and then connected in series with a normally closed contact of the fifth relay in the power supply loop of the first relay.
Preferably, two ends of the first relay are further electrically connected with an energy storage module, and the energy storage module can provide short-time electric quantity for the first relay.
Preferably, the energy storage module comprises an RC series circuit.
Preferably, a fourth trigger switch electrically connected with the elevator control system is also connected in series in the power circuit of the fan.
The invention also discloses a vertical elevator, which comprises a car, wherein a fan and the elevator car fan control device are arranged in the car.
Drawings
Fig. 1 is a schematic circuit diagram of a car door control switch according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a switching state switching circuit according to an embodiment of the invention.
Fig. 3 is a schematic diagram of circuit connection of a fan according to an embodiment of the present invention.
Detailed Description
In order to describe the technical content, structural features, implementation principles and achieved objects and effects of the present invention in detail, the following description is made in connection with the embodiments and the accompanying drawings.
As shown in fig. 1 to 3, the present invention discloses a vertical elevator, which comprises a car (not shown), wherein a door opening switch KM and a door closing switch GM electrically connected with an elevator control system are arranged in the car, when the elevator reaches a floor, a door opening action is performed by a car door when the door opening switch KM is actuated, and when the door closing switch GM is actuated, a door closing action is performed by the car door. The elevator car fan control device is characterized in that a fan 10 for ventilation and cooling is arranged in the elevator car, the fan 10 is conveniently controlled by passengers, the elevator car fan control device is electrically connected with the fan 10, a door opening switch KM and a door closing switch GM, state signals of the door opening switch KM and the door closing switch GM are collected in real time, when the door opening switch KM and the door closing switch GM are operated simultaneously, the fan 10 is converted into a working state, namely, the fan is converted into a closing state from opening, or the fan is converted into an opening state from closing, and when the passengers need to close or open the fan 10, the elevator car fan control device only needs to press the door opening switch KM and the door closing switch GM in the elevator car simultaneously.
Specifically, as shown in fig. 2 and 3, the elevator car fan control apparatus includes a first trigger switch 20 and a switch state transition circuit. The first trigger switch 20 is electrically connected to the fan 10, and is used for switching the on/off state of the fan 10. The switch state conversion circuit includes a signal acquisition unit 30, a conversion unit 31, and a control unit 32. The signal acquisition unit 30 is used for acquiring the working states of the door opening switch KM and the door closing switch GM. The control unit 32 is electrically connected to the first trigger switch 20, and is used for controlling the working state of the first trigger switch 20. When the signal acquisition unit 30 detects that the door opening switch KM and the door closing switch GM are simultaneously actuated, the switching unit 31 switches and maintains the control signal output by the control unit 32, and at present, if the fan 10 is in an on state, after the door opening switch KM and the door closing switch GM are simultaneously actuated once, the fan 10 is switched from the on state to the off state; similarly, at the present time, if the fan 10 is in the off state, the fan 10 is switched from the off state to the on state after the door opening switch KM and the door closing switch GM are simultaneously operated once.
The control unit 32 includes a first relay JF1, and converts the operation state of the first trigger switch 20 by powering on and powering off the first relay JF 1. In this embodiment, the first trigger switch 20 is one of normally closed contacts on the first relay JF1, when the first relay JF1 is in a released state, the first trigger switch 20 is kept in a closed state and is connected to the power circuit of the fan 10, and when the first relay JF1 is in a suction state, the first trigger switch 20 is switched to an open state and is disconnected from the power circuit of the fan 10.
The signal acquisition unit 30 includes a second trigger switch 21 and a third trigger switch 22 connected in series with the switching unit 31, respectively, when the door opening switch KM is actuated, the operation state of the second trigger switch 21 is switched, when the door closing switch GM is actuated, the operation state of the third trigger switch 22 is switched, and when the operation states of the second trigger switch 21 and the third trigger switch 22 are simultaneously changed, it means that the door opening switch KM and the door closing switch GM are simultaneously actuated, and the switching unit 31 performs a control signal switching action on the control unit 32. Preferably, the second trigger switch 21 and the third trigger switch 22 can be driven to switch working states through the second relay JF2 and the third relay JF3 respectively, namely, the door opening switch KM is connected in series in the power circuit of the second relay JF2, the door closing switch GM is connected in series in the power circuit of the third relay JF3, and the second relay JF2 and the third relay JF3 are electrically connected with the elevator control system through a pair of normally open contacts respectively, so that the action states of the door opening switch and the door closing switch are still normally input into the elevator control system, and the functions of the door opening switch and the door closing switch are not affected. In this embodiment, the second relay JF2 has two pairs of normally open contacts, namely a normally open contact a2 and a normally open contact b2, and the third relay JF3 has two pairs of normally open contacts, namely a normally open contact a3 and a normally open contact b3, and the normally open contact a2 and the normally open contact a3 are electrically connected with a door opening signal input end and a door closing signal input end of the elevator control system, respectively, and the normally open contact b2 and the normally open contact b3 are used as a second trigger switch 21 and a third trigger switch 22, respectively, and are connected in series with the switching unit 31. When the door opening switch KM is operated alone, the second relay JF2 is energized and in the closed state such that the normally open contact a2 is closed, the elevator control system obtains a door opening signal, and similarly, when the door closing switch GM is operated alone, the elevator control system obtains a door closing signal, the car door does not act when the elevator control system obtains both the door opening signal and the door closing signal, or the car door opens (opening the door if and only if the elevator car stops in the flat floor position, but opening the door does not affect the normal operation of the elevator). Through the arrangement of the second relay JF2 and the third relay JF3, the purpose of controlling the fan 10 through the existing door opening switch KM and the existing door closing switch GM of the elevator is achieved while the opening and closing actions of the elevator are not affected.
Further, as shown in fig. 2, the switching unit 31 includes a fourth relay JF4 having three pairs of contacts, a normally open contact a4, a normally open contact b4, and a normally closed contact c4, and a fifth relay JF5 having three pairs of contacts, a normally closed contact a5, a normally closed contact b5, and a normally open contact c5, respectively, and in addition, the first relay JF1 in the above embodiment has four pairs of contacts, a normally open contact a1, a normally closed contact b1, a normally open contact c1, and a normally closed contact d1 serving as the first trigger switch 20, respectively. The normally closed contact b1 of the first relay JF1 is connected in parallel with the normally open contact b4 of the fourth relay JF4 and then is connected in series with the normally closed contact b5 of the fifth relay JF5 in the power supply loop of the fourth relay JF 4; the normally open contact c1 of the first relay JF1 is connected in parallel with a normally open contact c5 of the fifth relay JF5 and then connected in series with a normally closed contact c4 of the fourth relay JF4 in a power supply loop of the fifth relay JF 5; the normally open contact a1 of the first relay JF1 is connected in parallel with the normally open contact a4 of the fourth relay JF4 and then connected in series with the normally closed contact a5 of the fifth relay JF5 in the power supply loop of the first relay JF 1.
The elevator car fan 10 control device with the above structure operates as follows:
1.1 initial Power-on of Elevator
When the elevator changes from the power-off state to the power-on state, on the one hand: the door opening switch KM and the door closing switch GM are not actuated, so that the second relay JF2 and the third relay JF3 are not attracted, the normally open contact b2 and the normally open contact b3 are opened, the fourth relay JF4 and the fifth relay JF5 are in a release state, and the normally open contact a4 of the fourth relay JF4 is opened, and on the other hand: the first relay JF1 is in a released state when the elevator is in a power-off state, and its normally open contact a1 is opened. In summary, the two aspects can be seen: when the elevator is turned to the power-on state, the first relay JF1 is continuously maintained in the release state, so that the normally closed contact d1 is in the on state.
1.2 door open switch KM and door close switch GM are pressed simultaneously
When the door opening switch KM and the door closing switch GM are pressed simultaneously, the second relay JF2 and the third relay JF3 are both closed, the normally open contact b2 and the normally open contact b3 are both closed, as can be seen from fig. 2, the normally closed contact b1 and the normally closed contact b5 at the front end of the fourth relay JF4 are both in the closed state, and the normally open contact c1 and the normally open contact c5 at the front end of the fifth relay JF5 are both in the open state, so that the fourth relay JF4 will be closed, and in the process of closing the fourth relay JF4, the normally closed contact c4 is firstly opened, so that the fifth relay JF5 cannot be closed, and then the normally open contact a4 is closed, so that the first relay JF1 is closed. When the door opening switch KM and the door closing switch GM are released, the second relay JF2 and the third relay JF3 are released, and the normally open contact 2 and the normally open contact b3 are opened, so that the fourth relay JF4 and the fifth relay JF5 are in a release state. Since the normally open contact a1 of the first relay JF1 is turned on after the relay is closed, the first relay JF1 is still maintained in the closed state after the door opening switch KM and the door closing switch GM are released. After the first relay JF1 is switched from the release state to the actuation state, the normally closed contact d1 thereof is opened, so that the power circuit of the fan 10 is switched from on to off, thereby completing the switching of the working state of the fan 10 once.
1.3 door switch KM and door switch GM are pressed down again simultaneously
When the door opening switch KM and the door closing switch GM are pressed down again simultaneously, the second relay JF2 and the third relay JF3 are both attracted, and the normally open contact b2 and the normally open contact b3 are both connected. As is clear from 1.2 above, the first relay JF1 is kept in the on state, and therefore, the normally closed contact b1 at the front end of the fourth relay JF4 is opened, and the normally open contact b4 is opened, so that the fourth relay JF4 is in the off state. The normally open contact c1 at the front end of the fifth relay JF5 is turned on, and the normally closed contact c4 is turned on, so that the fifth relay JF5 is attracted to cause the normally closed contact a5 to be turned off, and the normally open contact c5 is turned on, so that the first relay JF1 is converted into a release state from attraction, and then the normally closed contact d1 is turned on, and the power circuit of the fan 10 is converted into conduction from disconnection, so that the conversion of the working state of the fan 10 is completed again. Then the door opening switch KM and the door closing switch GM are released, the second relay JF2 and the third relay JF3 are both released, and the normally open contact b2 and the normally closed contact b3 are both opened, so that the fourth relay JF4 and the fifth relay JF5 are both in the released state, while the first relay JF1 remains in the released state, i.e., the fan 10 remains in the opened state.
In the above-mentioned this operation process, the door opening switch KM and the door closing switch GM are pressed again simultaneously and then released, the state of the first relay JF1 is converted into release, and at this time, the state of the entire switch state conversion circuit is the same as the initial power-on state in the above-mentioned 1.1.
In summary, the final state of the first relay JF1 in the above-described operation procedure 1.3 is the same as the final state in 1.1, and therefore, when the door opening switch KM and the door closing switch GM are simultaneously pressed a plurality of times, the first relay JF1 will cycle between the final state of 1.3 and the final state of 1.2, i.e., the first relay JF1 will cycle between the released state and the sucked state, thereby causing the fan 10 to cycle between on and off.
In addition, when the relay is switched from the release state to the suction state, the normally-closed contact is normally opened, and after a certain reaction time, the normally-open contact is closed. In the operation process of 1.3, when the first relay JF1 is powered on, the normally closed contact a5 thereof is opened first, so that the power supply loop of the first relay JF1 is opened, and after a certain reaction time, the normally open contact c5 is closed, if the normally open contact c5 cannot be closed before the normally open contact c1 which is already closed is opened, the first relay JF1 and the fifth relay JF5 will oscillate between the on and off states in turn, and then the power supply loop of the first relay JF1 may be turned on again before the door opening switch KM and the door closing switch GM are released, resulting in a conversion failure. Therefore, two ends of the first relay JF1 are further electrically connected to an energy storage module, and the energy storage module can provide short-time electric quantity for the first relay JF 1. Preferably, the energy storage module comprises an RC series circuit consisting of a capacitor C1 and a resistor R1.
In the above-mentioned operation 1.1, when the elevator is initially powered on, the tank circuit formed by the capacitor C1 and the resistor R1 connected in series does not store energy, and the state of the first relay JF1 is not affected. In the above operation process 1.2, the first relay JF1 is in the pull-in state, and charges the tank circuit composed of the capacitor C1 and the resistor R1. In the above operation process 1.3, after the fifth relay JF5 is powered on, the normally closed contact a5 thereof is opened first, thereby opening the power supply circuit of the first relay JF 1. At this time, the energy storage circuit composed of the capacitor C1 and the resistor R1 discharges the first relay JF1, so that the first relay JF1 still maintains the actuation state, and the capacitor C1 and the resistor R1 with appropriate specifications are selected, so that the time t for continuously maintaining the actuation state of the first relay JF1 is more than or equal to 0.1s and less than or equal to 0.4s, so that the normally open contact C5 of the fifth relay JF5 has enough time to be switched on, and the state transition failure of the first relay JF1 is avoided. When the energy of the tank circuit is consumed, the first relay JF1 is switched to a released state and is maintained in that state.
In order to save electric power, as shown in fig. 3, a fourth trigger switch 23 electrically connected to the elevator control system is also connected in series in the power circuit of the fan 10. When the elevator is in an idle state, the elevator control system may control the fourth trigger switch 23 to be in an off state, thereby turning off the power of the fan 10.
In summary, the present invention discloses a vertical elevator provided with an elevator car fan control device, in which the fan 10 is turned on (or turned off), and a passenger can simultaneously press and then release the door opening switch KM and the door closing switch GM, so that the first relay JF1 is turned from the released state to the engaged state (or from the engaged state to the released state), and the normally closed contact d1 is turned off (or turned on), so that the fan 10 is turned off (or turned on).
The foregoing disclosure is merely illustrative of the principles of the present invention, and thus, it is intended that the scope of the invention be limited thereto and not by this disclosure, but by the claims appended hereto.
Claims (9)
1. An elevator car fan controlling means for controlling the operating condition of a fan installed in an elevator car, in which a door opening switch and a door closing switch electrically connected with an elevator control system are installed, characterized in that the elevator car fan controlling means comprises:
the first trigger switch is electrically connected with the fan and used for switching the on/off state of the fan;
the switching state conversion circuit comprises a signal acquisition unit, a conversion unit and a control unit; the signal acquisition unit is used for acquiring working states of the door opening switch and the door closing switch; the control unit is electrically connected with the first trigger switch and is used for controlling the working state of the first trigger switch; when the signal acquisition unit detects that the door opening switch and the door closing switch are simultaneously operated, the conversion unit converts and maintains the control signal output by the control unit.
2. The elevator car fan control of claim 1, wherein the control unit includes a first relay for switching an operating state of the first trigger switch.
3. The elevator car fan control apparatus according to claim 2, wherein the signal acquisition unit includes a second trigger switch and a third trigger switch connected in series with the switching unit, respectively, an operation state of the second trigger switch being switched when the door opening switch is actuated, and an operation state of the third trigger switch being switched when the door closing switch is actuated.
4. The elevator car fan control apparatus according to claim 3, further comprising a second relay and a third relay for driving the second trigger switch and the third trigger switch to switch operating states, respectively, the door opening switch being connected in series in a power supply circuit of the second relay, the door closing switch being connected in series in a power supply circuit of the third relay, the second relay and the third relay being further electrically connected to an elevator control system through a pair of normally open contacts, respectively, such that operating states of the door opening switch and the door closing switch are still normally input to the elevator control system without affecting functions inherent in the door opening switch and the door closing switch.
5. The elevator car fan control device of claim 4, wherein the switching unit comprises a fourth relay and a fifth relay, wherein a normally closed contact of the first relay is connected in parallel with a normally open contact of the fourth relay and then connected in series with a normally closed contact of the fifth relay in a power supply loop of the fourth relay; a normally open contact of the first relay is connected in parallel with a normally open contact of the fifth relay and then connected in series with a normally closed contact of the fourth relay in a power supply loop of the fifth relay; and a normally open contact of the first relay is connected in parallel with a normally open contact of the fourth relay and then connected in series with a normally closed contact of the fifth relay in the power supply loop of the first relay.
6. The elevator car fan control device of claim 5, wherein the two ends of the first relay are further electrically connected to an energy storage module, and the energy storage module is capable of providing short-term power to the first relay.
7. The elevator car fan control of claim 6, wherein the energy storage module comprises an RC series circuit.
8. The elevator car fan control of claim 1, wherein a fourth trigger switch electrically connected to the elevator control system is also connected in series in the power circuit of the fan.
9. A vertical elevator comprising a car in which a fan and an elevator car fan control apparatus as claimed in any one of claims 1 to 8 are provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910353786.8A CN110040610B (en) | 2019-04-28 | 2019-04-28 | Elevator car fan control device and vertical elevator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910353786.8A CN110040610B (en) | 2019-04-28 | 2019-04-28 | Elevator car fan control device and vertical elevator |
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| Publication Number | Publication Date |
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| CN110040610A CN110040610A (en) | 2019-07-23 |
| CN110040610B true CN110040610B (en) | 2024-03-22 |
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