Control system of blowing device

Abstract

The utility model provides a control system of an air blowing device, which is used for controlling a stepping motor of the air blowing device to rotate so as to switch working modes of the air blowing device, and comprises a mechanical rocker switch arranged outside the air blowing device and a circuit board arranged in the air blowing device, the mechanical seesaw is electrically connected with the circuit board, the circuit board is electrically connected with the driving equipment, and the mechanical seesaw and the circuit board are directly connected with an alternating current power supply. In the control system provided by the utility model, the input ports on the mechanical warping plate and the circuit board can be directly connected with alternating-current strong current and do not need to be connected with weak current, so that the wiring circuit is simplified, and the hidden danger of burning the circuit board due to overvoltage cannot be caused even if the wire sequence is wrongly connected during installation. The mechanical rocker switch controls on-off of the alternating current power supply, namely, the circuit board can control steering of the stepping motor, switching between a blowing mode and an air exchange mode is achieved, operation is easy and convenient, cost is low, and safety and reliability are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the control technology field of electrical appliances especially relates to a control system of blowing device. BACKGROUND

[0002] The bath heater, as a kind of blowing device, is the sanitary room blowing heating equipment that many families must select currently, mainly for providing heating, lighting, ventilation and other functions to ensure the comfort degree when bathing in cold season.

[0003] As shown in Figure 1 The bath heater includes host box 1 and panel 2 arranged on host box 1, host box 1 includes bottom surface opposite to panel 2 and side surface enclosed around the bottom surface, and host box 1 is provided with volute and fan arranged in volute. Panel 2 is provided with air inlet 3 and blowing port 4, host box 1 is provided with heating element 5 in the inner side of blowing port 4, and host box 1 is provided with air exchange port 7 on one side surface close to blowing port 4, wherein air inlet 3 is communicated with the inlet of volute to introduce air, blowing port 4 is communicated with volute to form blowing channel, and air exchange port 7 is communicated with volute to form air exchange channel. Air duct switching baffle 6 is rotatably arranged between blowing channel and air exchange channel, when air duct switching baffle 6 is rotated to cut off air exchange channel under the action of stepping motor, blowing port 4 is communicated with air inlet 3, air is blown out through blowing port 4, and blowing mode is implemented, when air duct switching baffle 6 is rotated to cut off blowing channel, air exchange port 8 is communicated with air inlet 3, air is blown out from air exchange port 8, and air exchange mode is implemented.

[0004] The existing control scheme of the above-mentioned air duct switching baffle 6 adopts the control system combined with electronic switch and main control board, the control system includes main control board arranged in the bath heater and electronic switch arranged outside the bath heater (such as on the wall of bathroom), and the switch and the main control board are connected through low-voltage interconnection flexible line, wherein the electronic switch can be as shown in Figure 2 The above-mentioned control system not only supplies power to the stepping motor, but also sets multiple groups of electronic relay switches for controlling the fan and heating module in the bath heater, and the main control board receives the control signal input by the user through the electronic switch, and executes corresponding action according to the logic program to realize the corresponding function of the product.

[0005] However, the electronic components used in the above-mentioned control system are more, the scheme is complex, and the implementation cost is high, in addition, the main control board and the electronic switch are connected through low-voltage interconnection flexible line, which needs to connect weak current, such as 24V weak current, and the installation worker is easy to connect 220V strong current in the installation process, which leads to product burning and causes safety hazard.

[0006] Therefore, the prior art has at least the following technical problems: the control system of the bathroom heater in the prior art uses a large number of electronic components, has a complex structure, is high in cost, and is prone to misconnection of strong and weak electricity, which causes product burning and safety hazards. Content of the Utility Model

[0007] Embodiments of the present application provide a control system of a blowing device to solve the technical problem that the control system of the bathroom heater in the prior art uses a large number of electronic components, has a complex structure, is high in cost, and is prone to misconnection of strong and weak electricity, which causes product burning and safety hazards.

[0008] To solve the above technical problem, embodiments of the present application provide a control system of a blowing device, wherein the blowing device comprises an air inlet, a blowing port and an air exchange port, a fan is arranged at the air inlet, a switching baffle is arranged between the blowing port and the air exchange port, and the switching baffle is connected with a driving device; when the driving device is rotated to a first position, the switching baffle blocks the blowing port, the air inlet is communicated with the air exchange port, and the blowing device is in an air exchange mode; when the driving device is rotated to a second position, the switching baffle blocks the air exchange port, the air inlet is communicated with the blowing port, and the blowing device is in a blowing mode.

[0009] The control system is used to control rotation of the driving device, and the control system comprises a mechanical rocker switch arranged outside the blowing device and a circuit board arranged in the blowing device, the mechanical rocker switch is electrically connected with the circuit board, the circuit board is electrically connected with the driving device, and the mechanical rocker switch and the circuit board are both directly connected with an alternating current power supply.

[0010] Preferably, the circuit board is provided with a switching control circuit used to control forward and reverse rotation of the driving device to drive forward and reverse rotation of the switching baffle, so as to switch between the blowing mode and the air exchange mode, the switching control circuit is connected with a switching input port, a circuit board N-pole input port and a driving device output port.

[0011] More preferably, the switching control circuit comprises a first diode D1, a second diode D2, an optical coupler OPT, a triode Q1 and an MCU, the optical coupler OPT comprises an optical coupler diode and a photosensitive triode connected with each other, and the MCU is connected with the optical coupler diode and the photosensitive triode.

[0012] The switching input port is connected with a positive electrode of the first diode D1, a negative electrode of the first diode D1 is connected with a positive electrode of the optical coupler diode and a negative electrode of the second diode D2, a negative electrode of the optical coupler diode is connected with a positive electrode of the second diode D2 and one end of a third resistor R3, and the other end of the third resistor R3 is connected with the circuit board N-pole input port.

[0013] The collector of the photosensitive triode is connected to the base of the triode Q1 and one end of the second resistor R2, the emitter of the photosensitive triode and the emitter of the triode Q1 are both grounded, the collector of the triode Q1 is connected to one end of the first resistor R1 and one end of the fourth resistor R4, the other end of the first resistor R1 and the other end of the second resistor R2 are both connected to a high level, the other end of the fourth resistor R4 is connected to the MCU, the MCU is connected to the output port of the driving device, and the output port of the driving device is connected to the driving device.

[0014] Further, when the switching input port is powered on, the live wire of the alternating current power supply, the first diode D1, the optocoupler OPT and the third resistor R3 form a conducting loop, the diode end of the optocoupler OPT is open, the photosensitive triode end of the optocoupler OPT is conducting, the triode Q1 is off, the fourth resistor R4 is connected to a high level, and the MCU outputs a control instruction to make the driving device rotate to the ventilation position in the first direction after detecting the high level;

[0015] Conversely, when the switching input port is not powered on, the diode end of the optocoupler OPT is not conducting, the photosensitive triode end of the optocoupler OPT is not conducting, the triode Q1 is conducting, the fourth resistor R4 is connected to a low level, and the MCU outputs a control instruction to make the driving device rotate to the blowing position in the second direction after detecting the low level.

[0016] Preferably, the mechanical rocker switch comprises a fan function switch for controlling the start and stop of the fan, and a blowing / ventilation function switch for switching the blowing mode and the ventilation mode.

[0017] More preferably, the control system of the blowing device as described above, characterized in that the fan, the fan function switch and the alternating current power supply are sequentially connected to form a first series circuit.

[0018] Further, the blowing port is provided with a heating element, and the mechanical rocker switch further comprises a heating function switch for controlling the start and stop of the heating element to start and stop the warm air mode.

[0019] Further, the fan function switch, the blowing / ventilation function switch, the heating function switch, the heating element and the alternating current power supply are sequentially connected to form a second series circuit; the switching input port is connected to the blowing / ventilation function switch and the heating function switch through a wire, the line board L-pole input port is connected to the fan and the fan function switch through a wire, and the line board N-pole input port is connected to the zero line of the alternating current power supply.

[0020] Preferably, the line board is further provided with a power management module for converting alternating current into direct current with a set voltage to supply power to the driving device and the switching control circuit, the input end of the power management module is connected to the line board L-pole input port and the line board N-pole input port, and the output end of the power management module is connected to the driving device output port and the switching control circuit.

[0021] Preferably, the driving device is a stepper motor.

[0022] The technical scheme of the embodiment has at least the following technical effects:

[0023] (1) In the embodiment, all the input ports on the circuit board can be directly connected to 220V strong current, so that even if the wiring sequence is connected incorrectly during installation, the hidden danger of burning the circuit board due to overvoltage can be avoided.

[0024] (2) In the embodiment, the blowing and ventilation functions are realized on the same rocker switch function button, and the heating function button switch can only be turned on when the blowing is turned on, so that the safety hidden danger of high temperature caused by dry burning of the heating element due to the heating being turned on alone is effectively prevented, the number of buttons is reduced, the cost is reduced, and the use safety of the product is greatly improved.

[0025] (3) In the embodiment, the circuit board is used to control and drive the stepper motor, and the on-off of the alternating current power supply is controlled through the mechanical rocker switch, so that the control of the steering of the stepper motor is realized through the circuit board, the blowing and ventilation functions are switched, the operation is simple and convenient, the cost is low, and the safety is reliable. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the description of the embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0027] Figure 1 It is a structural schematic diagram of a bath heater in the prior art;

[0028] Figure 2 It is a structural schematic diagram of an electronic switch panel of a bath heater in the prior art;

[0029] Figure 3 It is a structural schematic diagram of a blowing device in an embodiment of the present application.

[0030] Figure 4 It is a sectional view of the cooperation of the main box and the adapter pipe (blowing mode) in an embodiment of the present application.

[0031] Figure 5 It is a sectional view of the cooperation of the main box and the adapter pipe (ventilation mode) in an embodiment of the present application.

[0032] Figure 6It is the structural schematic view of the host box in one embodiment of the utility model;

[0033] Figure 7 It is the structural schematic view of the mechanical rocker switch panel in one embodiment of the utility model;

[0034] Figure 8 It is the structural schematic view of the circuit board in one embodiment of the utility model;

[0035] Figure 9 It is the electrical schematic diagram of the control system in one embodiment of the utility model;

[0036] Figure 10 It is the electrical schematic diagram of the motor switching control module in one embodiment of the utility model.

[0037] In addition, Figure 1 The arrow in the middle indicates the air flow direction. Specific implementation

[0038] The control system of the blowing device is provided in the embodiment, so that the technical problem that the electronic components used in the control system of the bath heater in the prior art are numerous, the structure is complex, the cost is high, and the strong and weak electricity is easy to be connected incorrectly, resulting in product burning and safety hazards is solved.

[0039] In order to better understand the above technical solutions, the above technical solutions will be described in detail in combination with the drawings in the specification and specific embodiments.

[0040] As Figures 3 to 6 Indicated, one or more embodiments of the application provide a control system of a blowing device, including a host box 100 and a panel 200 for covering the opening of the host box 100, in use, the panel 200 faces the user, has a decorative effect, at the same time, the panel 200 is also provided with an air inlet 210 and a blowing port 220, in use, the indoor air is sucked into the host box 100 through the air inlet 210, and then blown to the indoor through the blowing port 220.

[0041] As Figures 4 to 6 Indicated, the host box 100 includes the above opening and the bottom plate 170 opposite to the opening, the side wall 160 is arranged around the bottom plate 170, the side wall 160 is perpendicular to the bottom plate 170, and the bottom plate 170 and the side wall 160 enclose the mounting space, for example, the host box 100 can be in the shape of a rectangular body. The mounting space is provided with a volute 120 and a fan 110 arranged in the volute 120, the volute 120 is formed with a volute inlet communicated with the air inlet 210 on the panel 200 and a volute air duct 121, the fan 110 rotates to drive the air flow, and forces the indoor air to enter the volute air duct 121 from the air inlet 210 on the panel 200 and the volute inlet in sequence.

[0042] The volute air duct 121 extends to one side wall 160 of the main cabinet 100 to form a communication hole 123, and an adapter duct 300 is detachably connected to the communication hole 123. When the adapter duct 300 is connected to the side of the main cabinet 100, the adapter duct 300 is in communication with the communication hole 123 of the volute air duct 121, and an air outlet 310 is arranged on the adapter duct 300 corresponding to the air outlet 220 on the panel 200. The air outlet 310 is coplanar or parallel to the opening. Thus, the adapter duct 300 and the main cabinet 100 can share the same panel 200, and the air in the volute air duct 121 can be blown to the indoor through the communication hole 123 of the volute air duct 121, the air outlet 310 on the adapter duct 300, and the air outlet 220 on the panel 200 in turn.

[0043] When the air blowing device is used as a bath heater, as shown in Figure 3 The panel 200 extends from the main cabinet 100 to the adapter duct 300, and the air inlet 210 and the air outlet 220 on the panel 200 are aligned with the volute inlet on the main cabinet 100 and the air outlet 310 on the adapter duct 300, respectively.

[0044] Since the adapter duct 300 is a separate part independent of the main cabinet 100 and is detachably connected to the main cabinet 100, different panel 200 sizes can be matched by setting multiple adapter ducts 300 with different relative positions (relative to the air inlet 210), sizes, and shapes to match different product appearances and installation environments.

[0045] In addition, as shown in Figures 2 to 4 A heating element 180 is fixed inside the communication hole 123, i.e., the heating element 180 is located in the main cabinet 100 to heat the air flowing from the communication hole 123 to the adapter duct 300 in the air blowing mode, forming a warm air mode. The heating element 180 can be a PTC heating element.

[0046] As shown in Figures 3 to 6 The volute air duct 121 simultaneously extends to the adjacent side wall of the side wall 160 of the main cabinet 100 where the communication hole 123 is located to form an air exchange opening 130 exposed to the main cabinet 100.

[0047] A switching baffle 140 is further arranged between the communication hole 123 and the air exchange opening 130. The switching baffle 140 is rotatably arranged in the volute air duct 121, and when the switching baffle 140 is rotated to a first position, the switching baffle 140 blocks and isolates the communication hole 123, and the volute air duct 121 is only in communication with the air exchange opening 130. The bath heater is in an air exchange mode, as shown in Figure 5As shown; when the switching baffle 140 rotates to the second position, the switching baffle 140 blocks and isolates the air exchange port 130, the volute air duct 121 only communicates with the adapter duct 300 through the communication hole 123, and the shower is in the blowing mode, as shown. Figure 4

[0048] Specifically, in the blowing mode, as shown, Figure 4 the fan 110 works, the air enters the volute air duct 121 from the air inlet 210 on the panel 200, rotates, and then enters the adapter duct 300 through the communication hole 123, and finally blows out through the air outlet 310 on the adapter duct 300 and the blowing port 220 on the panel 200, realizing the blowing function. In the air exchange mode, as shown, Figure 5 the fan 110 works, the air enters the volute air duct 121 from the air inlet 210 on the panel 200, rotates, and finally blows out from the air exchange port 130, which is connected to the outside, realizing the air exchange function.

[0049] Due to the use of the adapter duct 300, the central axes of the air inlet 210 and the communication hole 123 are perpendicular (in the embodiment of the present application, the side wall where the communication hole 123 is located is perpendicular to the top surface where the opening is located), so the switching baffle 140 is arranged perpendicular to the bottom surface of the main box 100. In the blowing mode, the air directly blows to the heating element 180 after heating and enters the adapter duct 300. When the air flows to the switching baffle 140, it turns in the direction tangent to the air duct arc surface of the switching baffle 140, the gas flow is more smooth, the wind efficiency loss is small, the heating efficiency is high, and the product performance is guaranteed.

[0050] Further, one side of the switching baffle 140 is fixed on the stepping motor shaft of the stepping motor 30, and the stepping motor shaft is arranged perpendicular to the bottom surface of the main box 1. When the stepping motor shaft reverses, it drives the switching baffle 140 to reverse, thereby switching between the blowing mode and the air exchange mode.

[0051] It should be noted that the fan 110 can also be a wind wheel or other air power device. In addition, for ease of description, the present application is described with the panel 200 on top and the main box 200 on the bottom.

[0052] In combination Figures 7 to 9 , the control system of the blowing device in the embodiment of the present application includes a mechanical tilting plate switch 10 arranged outside the blowing device (such as on the wall of the bathroom), a circuit board 20 arranged inside the blowing device, and a fan 110, a heating element 180, and a stepping motor 30. The mechanical tilting plate switch 10 is a single fire control switch, which controls the on-off of alternating current to control the work of each device.

[0053] ​The mechanical rocker switch 10 comprises a fan function switch 11 for controlling the start and stop of the fan 110, a blowing / ventilation function switch 12 for switching between blowing mode and ventilation mode, and a heating function switch 13 for controlling the start and stop of the heating element 180 to start and stop the heating mode.

[0054] The circuit board 20 is provided with a switching control circuit, a motor switching input port 23, a circuit board L-pole input port 24, a circuit board N-pole input port 25, and a stepping motor output port 21. The switching control circuit is used to control the forward and reverse rotation of the stepping motor 30 to drive the switching vane 140 to rotate forward and reversely, thereby switching between blowing mode and ventilation mode. The switching control circuit is connected to the motor switching input port 23, the circuit board N-pole input port 25, and the stepping motor output port 21.

[0055] The fan 110, the fan function switch 11, and the 220V AC power source are sequentially connected to form a first series circuit. When the fan function switch 11 is closed, the fan 110 is started; when the fan function switch 11 is opened, the fan 110 is stopped.

[0056] In a preferred embodiment, the L-pole connection port of the fan 110, the fan function switch 11, and the live wire (L-pole) of the 220V AC power source are sequentially connected, and the N-pole connection port of the fan 110 is connected to the zero wire (N-pole) of the 220V AC power source.

[0057] In a preferred embodiment, the fan 110 is also connected in parallel with a capacitor 111, which is used to assist the start of the fan 110.

[0058] The fan function switch 11, the blowing / ventilation function switch 12, the heating function switch 13, the heating element 180, and the 220V AC power source are sequentially connected to form a second series circuit. The motor switching input port 23 is connected to the blowing / ventilation function switch 12 and the heating function switch 13 through a wire, the circuit board L-pole input port 24 is connected to the fan 110 and the fan function switch 11 through a wire, and the circuit board N-pole input port 25 is connected to the zero wire (N-pole) of the 220V AC power source.

[0059] In a preferred embodiment, a temperature controller 190 is also connected in series in the second series circuit, which is used to control the temperature of the heating element 180.

[0060] When the fan function switch 11 is turned on, the fan 110 and the circuit board 20 are powered on to realize the air exchange function; only when the fan function switch 11 is turned on, the blowing function button of the blowing / air exchange function switch 12 is pressed, and the blowing / air exchange function switch 12 can be turned on, the motor switching input port 23 realizes the blowing function, otherwise, it is not powered on and has no response. When the blowing device is only in the blowing state, that is, the blowing function button of the blowing / air exchange function switch 12 is pressed, the heating function switch 13 can be turned on, the heating element 180 works, and the heating function is realized, otherwise, it is not powered on. In this way, the air exchange and blowing functions of the blowing device are interlocked, the dry burning of the heating element 180 in the windless state is effectively avoided, and the safety of the product is greatly improved.

[0061] In combination Figure 10 , the switching control circuit on the circuit board 20 includes a first diode D1, a second diode D2, an optical coupler OPT, a triode Q1 and a micro control unit MCU, the optical coupler OPT includes a light emitting diode and a light sensitive triode connected together, wherein:

[0062] The motor switching input port 23 is connected to the anode of the first diode D1, the cathode of the first diode D1 is connected to the anode of the light emitting diode and the cathode of the second diode D2, the cathode of the light emitting diode is connected to the anode of the second diode D2 and one end of the third resistor R3, and the other end of the third resistor R3 is connected to the N pole input port 25 of the circuit board;

[0063] The collector of the light sensitive triode is connected to the base of the triode Q1 and one end of the second resistor R2, the emitter of the light sensitive triode and the emitter of the triode Q1 are both grounded, the collector of the triode Q1 is connected to one end of the first resistor R1 and one end of the fourth resistor R4, the other end of the first resistor R1 and the other end of the second resistor R2 are both connected to a high level E, the other end of the fourth resistor R4 is connected to the MCU, and the MCU is connected to the output port 21 of the stepping motor.

[0064] When the motor switching input port 23 is powered on, the live wire of the alternating current power supply, the first diode D1, the optical coupler OPT and the third resistor R3 form a loop, the loop is turned on, the light emitting diode end is opened, after the light emitting diode is opened, the light sensitive triode end of the optical coupler OPT receives the light signal of the diode end, the light sensitive triode end of the optical coupler OPT is turned on, and after being turned on, the base of the triode Q1 is grounded, the triode Q1 is turned off, and the fourth resistor R4 is connected to a high level. When the MCU detects the high level, the control command of the stepping motor 30 rotating in the first direction to the air exchange position is output, the stepping motor 30 executes the control command of rotating in the first direction to the air exchange position, and the air exchange mode is opened;

[0065] Conversely, when the motor switching input port 23 is not powered, the diode end of the optocoupler OPT is not powered, the triode end of the optocoupler OPT does not receive a light signal, the triode end of the optocoupler OPT is not powered, the triode Q1 base is connected to a high level, the triode Q1 is powered on, the fourth resistor R4 is connected to a low level, and the MCU detects a low level and outputs a control instruction for the stepper motor 30 to rotate in the second direction to the blowing position. The stepper motor 30 executes the control instruction for rotating in the second direction to the air exchange blowing position, and the blowing mode is turned on.

[0066] Further, the circuit board 20 is further provided with a power management module, which is used to convert 220V alternating current into direct current of a set voltage to supply power to the stepper motor 30 and the switching control circuit. The power management module input end is connected to the circuit board L input port 24 and the circuit board N input port 25, and the power management module output end is connected to the stepper motor output port 21 and the switching control circuit, thereby providing direct current power supply for the stepper motor and the switching control circuit. The high level E adopts +5V high level provided by the power management module, and the stepper motor adopts +24V power supply provided by the power management module.

[0067] In a preferred embodiment, the power management module reduces the voltage of 220V alternating current through the transformer 22, and then converts the alternating current into direct current through the rectifier circuit.

[0068] The stepper motor output port 21 is connected to the stepper motor 30. On the one hand, the stepper motor output port 21 outputs 24V direct current power supply to supply power to the stepper motor 30. On the other hand, the stepper motor output port 21 also outputs a control signal to control the rotation of the stepper motor 30.

[0069] In summary, in the embodiment of the present application, the input ports (including the stepper motor output port 21, the circuit board L, and the circuit board N) on the circuit board 20 and the mechanical rocker switch 10 can all be directly connected to 220V strong current. Even if the wiring sequence is wrong during installation, it will not cause the hidden danger of burning the circuit board 20 due to overvoltage.

[0070] In the embodiment of the present application, the circuit board is used to control and drive the stepper motor, the on-off of the alternating current power supply is controlled through the mechanical rocker switch, the control of the rotation direction of the stepper motor is realized through the circuit board, the switching of the blowing and air exchange functions is realized, the operation is simple and convenient, the cost is low, and the product is safe and reliable.

[0071] In addition, in the embodiment of the present application, the blowing and air exchange functions are realized on the function keys of the same rocker switch, and are mutually exclusive. At the same time, the heating function switch can only be turned on when the blowing is turned on, effectively preventing the safety hidden danger of high temperature caused by dry burning of the heating element due to separate opening of the heating. Not only the number of switches is reduced, the cost is reduced, but also the use safety of the product is greatly improved.

[0072] It should be understood that, although the terms "first", "second" or the like can be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the example embodiments.

[0073] The orientation terms such as outer, middle, inner, etc. mentioned or possibly mentioned in the present specification are defined relative to the configuration shown in the drawings, and are relative concepts, so it is possible to change accordingly according to different positions, different use states. Therefore, these or other orientation terms should not be interpreted as limiting terms.

[0074] The above description is only the preferred embodiment of the present application, not any form and substantial limitation of the present application. It should be noted that for ordinary skilled in the art, without departing from the method of the present application, a number of improvements and supplements can also be made, which should be considered as the protection scope of the present application. For those skilled in the art, without departing from the spirit and scope of the present application, some changes, modifications and equivalent changes of the above disclosed technical content can be made, which are equivalent embodiments of the present application; at the same time, any equivalent changes, modifications and evolution of the above-mentioned embodiments according to the essential technology of the present application are still within the scope of the technical solutions of the present application.

Claims

1. A control system for a blower, characterized in that, The blowing device includes an air inlet, an air outlet, and a ventilation port. A fan is installed at the air inlet, and a switching baffle is installed between the air outlet and the ventilation port. The switching baffle is connected to a driving device. When the driving device rotates to the first position, the switching baffle blocks the air outlet, and the air inlet and ventilation port are connected, which is in ventilation mode. When the driving device rotates to the second position, the switching baffle blocks the ventilation port, and the air inlet and air outlet are connected, which is in blowing mode. The control system is used to control the rotation of the drive device, and the control system includes a mechanical rocker switch disposed outside the blower and a circuit board disposed inside the blower. The mechanical rocker is electrically connected to the circuit board, the circuit board is electrically connected to the drive device, and both the mechanical rocker and the circuit board are directly connected to an AC power supply.

2. The control system of the blower as described in claim 1, characterized in that, The circuit board is provided with a switching control circuit for controlling the forward and reverse rotation of the drive device to drive the switching baffle to rotate forward and reverse, thereby switching between the blowing mode and the ventilation mode. The switching control circuit is connected to the switching input port, the N-pole input port of the circuit board and the output port of the drive device.

3. The control system of the blower as described in claim 2, characterized in that, The switching control circuit includes a first diode D1, a second diode D2, an optocoupler OPT, a transistor Q1, and an MCU. The optocoupler OPT includes an optocoupler diode and a phototransistor connected in series, wherein: The switching input port is connected to the positive terminal of the first diode D1, the negative terminal of the first diode D1 is connected to the positive terminal of the optocoupler diode and the negative terminal of the second diode D2, the negative terminal of the optocoupler diode is connected to the positive terminal of the second diode D2 and one end of the third resistor R3, and the other end of the third resistor R3 is connected to the N-pole input port of the circuit board. The collector of the phototransistor is connected to the base of the transistor Q1 and one end of the second resistor R2. The emitters of both the phototransistor and the transistor Q1 are grounded. The collector of the transistor Q1 is connected to one end of the first resistor R1 and one end of the fourth resistor R4. The other ends of the first resistor R1 and the second resistor R2 are both connected to a high level. The other end of the fourth resistor R4 is connected to the MCU. The MCU is connected to the output port of the driver device, and the output port of the driver device is connected to the driver device.

4. The control system of the blower as described in claim 3, characterized in that, When the switching input port is powered on, the AC power live wire, the first diode D1, the optocoupler OPT and the third resistor R3 form a conducting loop. The diode terminal of the optocoupler OPT is open, the phototransistor terminal of the optocoupler OPT is conducting, the transistor Q1 is turned off, and the fourth resistor R4 is connected to a high level. After the MCU detects the high level, it outputs a control command to make the drive device rotate along the first direction to the ventilation position. Conversely, when the switching input port is not powered, the diode terminal of the optocoupler OPT is not connected, the phototransistor terminal of the optocoupler OPT is not conducting, the transistor Q1 is conducting, and the fourth resistor R4 is connected to a low level. After the MCU detects the low level, it outputs a control command to make the drive device rotate along the second direction to the blowing position.

5. The control system of the blower as described in claim 2 or 3, characterized in that, The mechanical rocker switch includes a fan function switch for controlling the start and stop of the fan, and a fan / ventilation function switch for switching between the blowing mode and the ventilation mode.

6. The control system of the blower as described in claim 5, characterized in that, The fan, fan function switch and AC power supply are connected end to end to form the first series circuit.

7. The control system of the blower as described in claim 6, characterized in that, The air outlet is equipped with a heating element, and the mechanical rocker switch also includes a heating function switch for controlling the heating element to start and stop, thereby starting and stopping the warm air mode.

8. The control system of the blower as described in claim 7, characterized in that, The fan function switch, the air blowing / ventilation function switch, the heating function switch, the heating element, and the AC power supply are connected in sequence to form a second series circuit; the switching input port is connected between the air blowing / ventilation function switch and the heating function switch via a wire, the L-pole input port of the circuit board is connected between the fan and the fan function switch via a wire, and the N-pole input port of the circuit board is connected to the neutral wire of the AC power supply.

9. The control system of the blower as described in claim 2, characterized in that, The circuit board is also equipped with a power management module for converting AC power into DC power of a set voltage to power the drive device and the switching control circuit. The input terminal of the power management module is connected to the L-pole input port and the N-pole input port of the circuit board, and the output terminal of the power management module is connected to the output port of the drive device and the switching control circuit.

10. The control system of the blower as described in claim 1 or 2, characterized in that, The driving device is a stepper motor.

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