Air curtain machine control device and air curtain machine

Abstract

The utility model discloses an air curtain machine control device and an air curtain machine, a user can send a delay setting signal to a delay signal receiving circuit to realize the setting of delayed closing of the air curtain machine, a controller outputs an air curtain machine starting signal to an air curtain machine driving circuit according to a detection signal of a human body detection module when a human body exists in an elevator, and the air curtain machine is driven by the air curtain machine driving circuit. Therefore, the air curtain machine is controlled to start when a human body exists in the elevator; when the controller determines that no human body exists in the elevator, the air curtain machine closing signal is output to the air curtain machine driving circuit in a delayed mode, so that the air curtain machine can be closed in a delayed mode according to the delayed output time set by a user, the user can set the delayed closing time of the air curtain machine according to requirements, and the user experience is improved; the air curtain machine can be automatically controlled to be switched on and off according to human body detection signals in the elevator, and electric energy is saved.

Description

Technical Field

[0001] The utility model relates to the field of air curtain machines, in particular to an air curtain machine control device and an air curtain machine. Background Art

[0002] The air curtain machine generates a strong airflow through the rotation of the wind wheel, sends out a curtain-like airflow of a certain speed and temperature, and forms an invisible air curtain. The air curtain machine can separate the indoor and outdoor air, prevent the exchange of indoor and outdoor cold and hot air, keep the indoor cold air or hot air from flowing out, and at the same time block dust and insects, and prevent the spread of harmful gases or odors.

[0003] Existing air curtain machines usually need to be turned on and off manually by users, and when users forget to turn off the air curtain machine, it will cause power loss. Utility Model Content

[0004] The utility model aims to overcome the shortcomings and deficiencies of the prior art and to provide an air curtain control device and an air curtain which can intelligently control the operating state of the air curtain according to the status of people in the elevator.

[0005] The utility model provides an air curtain machine control device, comprising: a delayed signal receiving circuit, a controller, a human body detection module and an air curtain machine driving circuit; the controller is respectively connected to the delayed signal receiving circuit, the human body detection module and the air curtain machine driving circuit; the air curtain machine driving circuit is communicatively connected to an air curtain machine body arranged in an elevator car;

[0006] The delay signal receiving circuit is used to receive a delay setting signal; the delay setting signal is used to set the delay output time of the controller;

[0007] The human body detection module is used to detect whether there is a human body in the elevator;

[0008] The controller is used to receive the detection signal of the human body detection module, output an air curtain start signal to the air curtain drive circuit when there is a human body in the elevator, and output an air curtain close signal to the air curtain drive circuit with a delay when there is no human body in the elevator.

[0009] The utility model provides an air curtain machine, comprising an air curtain machine body and an air curtain machine control device as described in any one of the above items; the air curtain machine body is communicatively connected with the air curtain machine control device.

[0010] In an embodiment of the present application, the user can set the delayed closing of the air curtain by sending a delay setting signal to the delay signal receiving circuit. The controller outputs an air curtain start signal to the air curtain drive circuit when there is a human body in the elevator based on the detection signal of the human body detection module, thereby controlling the start of the air curtain when there is a human body in the elevator; the controller delays the output of the air curtain closing signal to the air curtain drive circuit when it is determined that there is no human body in the elevator, so that the air curtain can be delayed according to the delayed output time set by the user. The user can set the delayed closing time of the air curtain according to needs to improve the user experience; the present application can automatically control the switch of the air curtain according to the human body detection signal in the elevator to save electricity.

[0011] In order to better understand and implement the present invention, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of an air curtain machine control device according to one embodiment of the utility model;

[0013] Figure 2 It is a circuit diagram of a wrong connection protection circuit of one embodiment of the utility model;

[0014] Figure 3 This is a circuit diagram of an air curtain machine driving circuit according to an embodiment of the utility model;

[0015] Figure 4 This is a circuit diagram of an air curtain machine control device according to another embodiment of the utility model;

[0016] Figure 5 This is a structural schematic diagram of an air curtain machine according to one embodiment of the utility model; DETAILED DESCRIPTION

[0017] In order to make the objectives, technical solutions and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0018] It should be clear that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the embodiments of the present application.

[0019] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0020] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims. In the description of the present application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and do not have to be used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0021] The air curtain control device of the present application can be applied to the air curtain to control the working state of the air curtain in the elevator. For details, please refer to Figure 1 The present application provides an air curtain control device, which is communicatively connected to an air curtain body arranged in an elevator car, and the device comprises: a delayed signal receiving circuit 110, a controller 120, a human body detection module 130 and an air curtain drive circuit 140; the controller 120 is respectively connected to the delayed signal receiving circuit 110, the human body detection module 130 and the air curtain drive circuit 140;

[0022] The delay signal receiving circuit 110 is used to receive a delay setting signal; the delay setting signal is used to set the delay output time of the controller 120;

[0023] The human body detection module 130 is used to detect whether there is a human body in the elevator;

[0024] The controller 120 is used to receive the detection signal of the human body detection module 130, output an air curtain start signal to the air curtain drive circuit 140 when there is a human body in the elevator, and output an air curtain close signal to the air curtain drive circuit 140 with a delay when there is no human body in the elevator.

[0025] The delay setting signal may be a signal input by a user through an external device, and the external device is connected to the delay signal receiving circuit 110 through a wireless communication method such as Bluetooth or WIFI or a wired communication method.

[0026] The delay setting signal is used to delay the output of the air curtain closing signal to the air curtain driving circuit 140, thereby controlling the air curtain to delay closing. The delay output time can be set according to the actual application requirements of the user.

[0027] The controller 120 may be a single chip microcomputer or other microcomputers, and a delay module or a delay device with a delay function may be integrated inside the controller 120 .

[0028] The human body detection module 130 may adopt common human body sensing devices such as a microwave human body sensing module and an infrared pyroelectric detection module. The human body detection module may be installed in the elevator car to detect whether there is a human body in the elevator.

[0029] The air curtain drive circuit 140 is used to control the operating state of the air curtain; the operating state may include on, off, high-speed operation or low-speed operation.

[0030] In an embodiment of the present application, the user can set the delayed closing of the air curtain by sending a delay setting signal to the delay signal receiving circuit. The controller outputs the air curtain start signal to the air curtain drive circuit when there is a human body in the elevator according to the detection signal of the human body detection module, thereby controlling the start of the air curtain when there is a human body in the elevator; the controller delays the output of the air curtain closing signal to the air curtain drive circuit when it is determined that there is no human body in the elevator, so that the air curtain can be delayed according to the delayed output time set by the user. The user can set the delayed closing time of the air curtain according to the needs to improve the user experience. In one embodiment, the delay signal receiving circuit 110 includes a dip switch, and the dip switch includes at least two switches; each switch is connected to the controller respectively, and each switch corresponds to a delayed output time.

[0031] The correspondence between each switch and the delayed output time can be pre-set by the user and stored in the controller 120. For example, in this embodiment, the dip switch can include a four-way switch, and the delayed output times corresponding to the four-way switches can be 30 seconds, 1 minute, 2 minutes and 5 minutes respectively.

[0032] In an embodiment of the present application, the user can set the delayed closing of the air curtain by sending a delay setting signal to the delay signal receiving circuit. The controller outputs an air curtain start signal to the air curtain drive circuit when there is a human body in the elevator based on the detection signal of the human body detection module, thereby controlling the start of the air curtain when there is a human body in the elevator; the controller delays the output of the air curtain closing signal to the air curtain drive circuit when it is determined that there is no human body in the elevator, so that the air curtain can be delayed according to the delayed output time set by the user. The user can set the delayed closing time of the air curtain according to needs to improve the user experience; the present application can automatically control the switch of the air curtain according to the human body detection signal in the elevator to save electricity.

[0033] In one embodiment, the air curtain machine control device further includes a door state identification module connected to the controller;

[0034] The door state recognition module is used to detect the open and close state of the elevator door;

[0035] In an embodiment of the present application, the controller can control the start and close of the air curtain machine in combination with the switch state of the elevator door and the detection signal of the human body detection module. Specifically, when the elevator door is opened and the human body detection module detects a human body, the air curtain machine start signal is output to the air curtain machine drive circuit to control the start of the air curtain machine, thereby improving the user's experience of taking the elevator; when the elevator door is closed and the human body detection module does not detect a human body, the air curtain machine shutdown signal is output to the air curtain machine drive circuit with a delayed output, thereby controlling the air curtain machine to be closed through the air curtain machine drive circuit to save energy.

[0036] The embodiment of the present application utilizes a door state recognition module to detect the opening and closing state of an elevator door, and combines the opening and closing state of the elevator door with the detection signal of a human body detection module to more accurately control the start and close of the air curtain machine, thereby making the operation of the air curtain machine more intelligent, more energy-saving and power-saving, and improving the user experience.

[0037] Specifically, the human body detection module 130 includes a human body sensor and a wrong connection protection circuit; the human body sensor can be a microwave human body sensing module, an infrared pyroelectric detection module or other devices that can sense the human body. The human body sensor can be flexibly installed on the front of the air curtain body or under the air outlet through an extension line. The wrong connection protection circuit can be used to protect the human body sensing detection module 130 when the user connects the wrong line, to avoid the human body sensing detection module 130 from burning out due to wrong connection.

[0038] The human body sensor includes a first input terminal, a second input terminal and an output terminal, and the wrong connection protection circuit includes a capacitor, an electrolytic capacitor, a TVS tube, a first diode and a first resistor;

[0039] The human body sensor includes a first input end, a second input end and an output end, the first input end is respectively connected to the first end of the capacitor, the positive electrode of the electrolytic capacitor, the cathode of the first diode and the power supply, the second input end is respectively connected to the second end of the capacitor, the negative electrode of the electrolytic capacitor, the anode of the first diode and the ground, the output end is respectively connected to the first end of the first resistor and the negative electrode of the TVS tube, the second end of the first resistor is connected to the controller, and the positive electrode of the TVS tube is grounded.

[0040] In one embodiment, Figure 2 As shown, the wrong connection protection circuit is connected to the human body sensor through the interface CN1, and the wrong connection protection circuit includes a capacitor C4, an electrolytic capacitor E4, a TVS tube TVS1, a diode D6 and a resistor R5.

[0041] The human body sensor includes a first input end, a second input end and an output end, the first input end is respectively connected to the first end of the capacitor C4, the positive electrode of the electrolytic capacitor E4, the cathode of the diode D6 and the power supply, the second input end is respectively connected to the second end of the capacitor C4, the negative electrode of the electrolytic capacitor E4, the anode of the diode D6 and the ground, the output end is respectively connected to the first end of the resistor R5 and the negative electrode of the TVS tube TVS1, the second end of the resistor R5 is connected to the controller, and the positive electrode of the TVS tube TVS1 is grounded.

[0042] In the embodiment of the present application, a reverse-connected diode is provided at the power supply end and the ground end of the human body sensor to prevent the user from connecting the wrong wires and burning the human body sensor. At the same time, an electrolytic capacitor and a capacitor are used to filter the power supply signal to improve the reliability of the electrical signal input to the human body sensor.

[0043] In one embodiment, the controller may output a first drive signal or a second drive signal to the air curtain drive circuit, wherein the first drive signal is used to control the air curtain to run at a high speed, and the second drive signal is used to control the air curtain to run at a low speed.

[0044] The air curtain machine driving circuit includes a first driving circuit and a second driving circuit;

[0045] The first drive circuit is connected to a high-speed operation circuit of the motor of the air curtain machine, and the second drive circuit is connected to a low-speed operation circuit of the motor of the air curtain machine.

[0046] The first driving circuit is used to control the motor of the air curtain to run at a high speed, so that the air curtain can quickly supply air and quickly reduce the temperature in the elevator.

[0047] The second driving circuit is used to control the motor of the air curtain machine to run at a low speed, thereby avoiding excessive wind force causing discomfort to the user. At the same time, it can ensure the air supply of the air curtain machine, improve the comfort in the elevator, and improve the user experience.

[0048] The first driving circuit includes a second resistor, a first triode, a second diode and a first relay;

[0049] The base of the first transistor is connected to the controller through the second resistor, the collector of the first transistor is connected to the anode of the second diode and the first end of the coil of the first relay respectively, the cathode of the second diode and the second end of the coil of the first relay are connected to the power supply respectively, and the emitter of the first transistor is grounded; a pair of contacts of the first relay are connected in series to the high-speed operation circuit of the motor of the air curtain machine;

[0050] The second driving circuit includes a third resistor, a second triode, a third diode and a second relay;

[0051] The base of the second triode is connected to the controller through the third resistor, the collector of the second triode is respectively connected to the anode of the second diode and the first end of the coil of the second electrical appliance, the cathode of the third diode and the second end of the coil of the second relay are respectively connected to the power supply, and the emitter of the third triode is grounded; a pair of contacts of the second relay are connected in series to the low-speed operation circuit of the motor of the air curtain machine.

[0052] like Figure 3 As shown, the first driving circuit includes a resistor R3, a transistor Q1, a diode D3 and a relay K1;

[0053] The base of the transistor Q1 is connected to the controller through the resistor R3, the collector of the transistor Q1 is connected to the anode of the diode D3 and the first end of the coil of the relay K1 respectively, the cathode of the diode D3 and the second end of the coil of the relay K1 are connected to the power supply respectively, and the emitter of the transistor Q1 is grounded; a pair of contacts of the relay K1 are connected in series to the high-speed operation circuit of the motor of the air curtain machine.

[0054] In the embodiment of the present application, the first drive signal can be a high-level signal. The transistor Q1 is turned on after receiving the high-level signal, and the energized contacts of the relay K1 coil are closed, thereby conducting the high-speed operation circuit of the motor of the air curtain machine and controlling the high-speed operation of the air curtain machine; when it is necessary to control the air curtain machine to close, a low-level signal can be output to cut off the transistor Q1, so that the de-energized contacts of the relay K1 coil are disconnected, and the motor of the air curtain machine stops running.

[0055] like Figure 3 As shown, the second driving circuit includes a resistor R4, a transistor Q2, a diode D4 and a relay K2;

[0056] The base of the transistor Q2 is connected to the controller through the resistor R4, the collector of the transistor Q2 is connected to the anode of the diode D4 and the first end of the coil of the relay K1 respectively, the cathode of the diode D4 and the second end of the coil of the relay K2 are connected to the power supply respectively, and the emitter of the transistor Q2 is grounded; a pair of contacts of the relay K2 are connected in series to the low-speed operation circuit of the motor of the air curtain machine.

[0057] In the embodiment of the present application, the second drive signal can be a high-level signal. After receiving the second drive signal, the transistor Q2 is turned on, and the energized contacts of the relay K2 coil are closed, thereby conducting the low-speed operation circuit of the motor of the air curtain machine and controlling the air curtain machine to run at a low speed; when it is necessary to control the air curtain machine to close, a low-level signal can be output to cut off the transistor Q2, so that the de-energized contacts of the relay K2 coil are disconnected, and the motor of the air curtain machine stops running.

[0058] In an embodiment of the present application, the controller may need to output a first drive signal to the first drive circuit to control the air curtain to run at high speed, for example, to control the air curtain to run at high speed in summer to quickly blow air to cool down, or to output a second drive signal to the second drive circuit to control the air curtain to run at low speed, for example, to control the air curtain to run at low speed in winter to avoid strong wind lowering the elevator temperature and affecting the user experience.

[0059] In one embodiment, the air curtain control device further includes a temperature detection module, which is disposed in the elevator car and connected to the controller.

[0060] The controller outputs a first driving signal to the first driving circuit, or outputs a second driving signal to the second driving circuit according to the detection signal of the temperature detection module.

[0061] In the embodiment of the present application, the temperature detection module is used to detect the ambient temperature of the elevator, and control the air curtain to run at high speed or low speed according to the ambient temperature.

[0062] Specifically, when the ambient temperature is ≥30℃, it means that the ambient temperature is high. At this time, the air curtain machine can be controlled to run in high gear, so as to ensure that people can enjoy cooling when taking the elevator in hot seasons. When 30℃>ambient temperature ≥18℃, it means that the ambient temperature is low. At this time, the air curtain machine can be controlled to run in low gear. When 18℃>ambient temperature, the air curtain machine can be controlled not to run.

[0063] The embodiment of the present application controls the air curtain to run at high speed or low speed according to the ambient temperature of the elevator.

[0064] In this way, the air curtain machine can be controlled to blow air quickly to cool down in high temperature seasons, and can be controlled to run at a low speed in low temperature seasons to avoid strong winds causing discomfort to users, thereby improving the comfort of users riding in elevators.

[0065] In one embodiment, it also includes a power protection circuit, a rectifier circuit and a voltage conversion circuit; the input end of the power protection circuit is connected to the power supply, the output end of the protection circuit is connected to the input end of the rectifier circuit, and the output end of the rectifier circuit is connected to the input end of the voltage conversion circuit.

[0066] The power protection circuit is used to protect the electrical signal output by the power supply from lightning surges. The protection circuit can adopt existing circuit modules or components with lightning surge protection functions, such as varistors.

[0067] like Figure 4 As shown, in the embodiment of the present application, the power protection circuit includes: a fuse F1, a varistor ZNR1, a thermistor RT, an X capacitor XC1 and a resistor R1, and the power supply can be a 220V AC power supply.

[0068] A first end of the fuse F1 is connected to the live wire of the 220V AC power supply, a first end of the fuse F1 is respectively connected to a first end of the varistor ZNR1, a first end of the thermistor RT, a first end of the resistor R1, and a first end of the X-capacitor XC1, a second end of the varistor ZNR1, a second end of the resistor R1, and a second end of the X-capacitor XC1 are connected to the neutral wire of the 220V AC power supply, and a second end of the thermistor RT is connected to the input end of the rectifier circuit.

[0069] In the present application, the protection circuit uses a fuse and a varistor to perform lightning surge protection on the electrical signal of the 220V AC power supply, and uses a thermistor to perform temperature protection on the electrical signal of the 220V AC power supply. The protection circuit of the present application can be used in power grids with large voltage fluctuations to improve the stability and reliability of the power supply of the power grid.

[0070] The rectifier circuit is used to convert alternating current into direct current. The rectifier circuit of the present application can use common rectifier elements or rectifier modules such as a rectifier bridge to rectify the electrical signal of the power supply.

[0071] In the embodiment of the present application, the rectifier circuit includes a rectifier bridge DB1, electrolytic capacitors E1-E2, an inductor L1 and a resistor R2;

[0072] The first end of the rectifier bridge DB1 is connected to the second end of the thermistor RT, the second end of the rectifier bridge DB1 is respectively connected to the first end of the electrolytic capacitor E1, the first end of the inductor L1 and the first end of the resistor R2, the third end of the rectifier bridge DB1 is connected to the neutral line of the 220V AC power supply, the fourth section of the rectifier bridge DB1 is respectively connected to the second end of the electrolytic capacitor E1, the second end of the electrolytic capacitor E2 and the ground, and the second end of the inductor L1 is respectively connected to the second end of the resistor R2, the first end of the electrolytic capacitor E2 and the input end of the voltage conversion circuit.

[0073] The voltage conversion circuit is used to convert the voltage of the power supply into a target voltage, wherein the target voltage may be the power consumption voltage of each module of the air curtain machine and / or the air curtain machine control device.

[0074] In an embodiment of the present application, the 220V AC voltage is rectified into a 310V high-voltage DC voltage by a rectifier bridge, filtered by a filter circuit composed of an electrolytic capacitor, an inductor and a resistor, and then output to a voltage conversion circuit for voltage conversion, thereby improving the stability and reliability of the power supply.

[0075] The voltage conversion circuit includes a voltage conversion chip U1, a resistor RS, diodes D1-D2, capacitors C1-C2, an electrolytic capacitor E3, a voltage stabilizing diode DZ and an inductor L2;

[0076] The Drain end of the voltage conversion chip is connected to the second end of the inductor L1, the CS end of the voltage conversion chip is connected to the first end of the resistor RS, the second end of the resistor RS is respectively connected to the first end of the capacitor C1, the cathode of the diode D1 and the first end of the inductor L2, the second end of the capacitor C1 is respectively connected to the VCC end of the voltage conversion chip and the positive electrode of the Zener diode DZ, the negative electrode of the Zener diode DZ is connected to the cathode of the diode D2, the anode of the diode D2 is respectively connected to the second end of the inductor L2, the first end of the electrolytic capacitor E3, the power supply and the first end of the capacitor C2, and the anode of the diode D1, the second end of the electrolytic capacitor E3 and the second end of the capacitor C2 are grounded.

[0077] The voltage conversion chip U1 is used to convert the voltage of the power supply into a target voltage; the voltage conversion chip can adopt an existing power supply chip.

[0078] In the embodiment of the present application, the 220V AC power supply is subjected to lightning surge protection by a protection circuit, rectified and filtered by a rectifier circuit, and then converted into an electrical signal of a target voltage by a voltage conversion circuit, thereby supplying power to the air curtain machine and / or each module of the air curtain machine control device. The power supply circuit of the present application has a lower cost than the isolated power supply, and can be applied to a power grid with large voltage fluctuations to obtain a stable and reliable power supply signal, thereby improving the stability and reliability of the operation of the air curtain machine.

[0079] like Figure 5 As shown, the present application also provides an air curtain machine 200, which includes an air curtain machine body 210 and an air curtain machine control device 220 as described above; the air curtain machine body 210 is communicatively connected with the air curtain machine control device 200; the air curtain machine body is arranged in an elevator car.

[0080] The present invention is not limited to the above-mentioned embodiments. If various changes or modifications to the present invention do not depart from the spirit and scope of the present invention, and if these changes and modifications fall within the claims of the present invention and the scope of equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. An air curtain machine control device, characterized in that: include: Delay signal receiving circuit, controller, human body detection module and air curtain machine driving circuit; The controller is connected to the human body detection module and the air curtain drive circuit respectively; the air curtain drive circuit is connected to the air curtain body arranged in the elevator car for communication; The delay signal receiving circuit includes a dip switch, and the dip switch includes at least two switches; the at least two switches are respectively connected to the controller, and each switch corresponds to a delay output time; The human body detection module is used to detect whether there is a human body in the elevator; The controller is used to receive the detection signal of the human body detection module, output an air curtain start signal to the air curtain drive circuit when there is a human body in the elevator, and output an air curtain close signal to the air curtain drive circuit according to the delayed output time delay when there is no human body in the elevator.

2. The air curtain control device according to claim 1, characterized in that: The human body detection module includes a human body sensor and a wrong connection protection circuit; The human body sensor includes a first input terminal, a second input terminal and an output terminal, and the wrong connection protection circuit includes a capacitor, an electrolytic capacitor, a TVS tube, a first diode and a first resistor; The human body sensor includes a first input end, a second input end and an output end, the first input end is respectively connected to the first end of the capacitor, the positive electrode of the electrolytic capacitor, the cathode of the first diode and the power supply, the second input end is respectively connected to the second end of the capacitor, the negative electrode of the electrolytic capacitor, the anode of the first diode and the ground, the output end is respectively connected to the first end of the first resistor and the negative electrode of the TVS tube, the second end of the first resistor is connected to the controller, and the positive electrode of the TVS tube is grounded.

3. The air curtain control device according to claim 1, characterized in that: including a door state identification module connected to the controller; The door state recognition module is used to detect the open and close state of the elevator door.

4. The air curtain control device according to claim 1, characterized in that: The air curtain machine driving circuit includes a first driving circuit and a second driving circuit; The first drive circuit is connected to a high-speed operation circuit of the motor of the air curtain machine, and the second drive circuit is connected to a low-speed operation circuit of the motor of the air curtain machine.

5. The air curtain control device according to claim 4, characterized in that: The first driving circuit includes a second resistor, a first triode, a second diode and a first relay; The base of the first transistor is connected to the controller through the second resistor, the collector of the first transistor is connected to the anode of the second diode and the first end of the coil of the first relay respectively, the cathode of the second diode and the second end of the coil of the first relay are connected to the power supply respectively, and the emitter of the first transistor is grounded; a pair of contacts of the first relay are connected in series to the high-speed operation circuit of the motor of the air curtain machine; The second driving circuit includes a third resistor, a second triode, a third diode and a second relay; The base of the second triode is connected to the controller through the third resistor, the collector of the second triode is respectively connected to the anode of the second diode and the first end of the coil of the second electrical appliance, the cathode of the third diode and the second end of the coil of the second relay are respectively connected to the power supply, and the emitter of the third triode is grounded; a pair of contacts of the second relay are connected in series to the low-speed operation circuit of the motor of the air curtain machine.

6. The air curtain control device according to claim 4, characterized in that: It also includes a temperature detection module, which is arranged in the elevator car and connected to the controller; The controller outputs a first driving signal to the first driving circuit, or outputs a second driving signal to the second driving circuit according to the detection signal of the temperature detection module.

7. The air curtain control device according to claim 1, characterized in that: It also includes a power protection circuit, a rectifier circuit and a voltage conversion circuit; the input end of the power protection circuit is connected to the power supply, the output end of the protection circuit is connected to the input end of the rectifier circuit, and the output end of the rectifier circuit is connected to the input end of the voltage conversion circuit.

8. An air curtain machine, characterized in that: It comprises an air curtain machine body and an air curtain machine control device as described in any one of claims 1 to 7; the air curtain machine body is communicatively connected with the air curtain machine control device.

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