Speed-adjustable slow-start phase-loss non-burning motor negative pressure fan

Abstract

The utility model relates to fan technical field, concretely is a kind of adjustable speed slow start phase-lacking non-burning motor's negative pressure fan, including fan body, control device and power supply, fan body includes outer frame, the impeller and motor of being located outer frame inboard, motor is transmission connection with impeller, to drive impeller rotation;Control device is electrically connected with motor and power supply, control device is located outer frame inboard, including main circuit board, the controller of being electrically connected with main circuit board and the hall sensor and three-phase voltage detection module of being electrically connected with controller.The utility model provides negative pressure fan with adjustable speed slow start and phase-lacking protection function, can greatly reduce starting current, reduce energy consumption, realize phase-lacking protection fast response, effectively avoid motor burnout, applicable to agricultural greenhouse, poultry breeding and other need high efficiency ventilation and the scene of higher requirement to motor stability.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, specifically a negative pressure fan with adjustable speed and slow start that does not burn out the motor in the event of a phase loss. Background Technology

[0002] Negative pressure fans are widely used in industrial ventilation, agricultural greenhouses, poultry farming and other scenarios due to their high reliability and low cost. However, in actual applications, existing negative pressure fans do not integrate speed regulation and phase loss protection functions, and lack a protection mechanism for motor phase loss. Therefore, existing negative pressure fans have problems such as high starting current, high energy consumption, and easy motor burnout in the event of a phase loss. To ensure the reliable operation of negative pressure fans, it is usually necessary to add protection devices such as phase loss protectors at the power input terminal of the fan to prevent the negative pressure fan from being burned out in the event of a phase loss fault. Utility Model Content

[0003] The purpose of this invention is to provide a negative pressure fan that can be started slowly with adjustable speed and does not burn out the motor in the event of a phase loss, in order to overcome the problems existing in the existing equipment.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a negative pressure fan with adjustable speed and slow start that does not burn out the motor in the event of a phase loss, comprising a fan body, a control device and a power supply. The fan body includes an outer frame, an impeller and a motor located inside the outer frame. The motor is connected to the impeller for driving the impeller to rotate. The control device is electrically connected to the motor and the power supply. The control device is located inside the outer frame and includes a main circuit board, a controller electrically connected to the main circuit board, and a Hall sensor and a three-phase voltage detection module electrically connected to the controller.

[0005] Based on the above technical solution, the present invention can be further improved as follows: As a further improvement to the above technical solution, an air collecting plate and a column are fixedly installed on the inner side of the outer frame. A circular ventilation hole is provided in the center of the air collecting plate. The impeller is installed in the ventilation hole of the air collecting plate. The impeller includes a hub, multiple fan blades arranged around the hub, and a rotating shaft connected to the center of the hub. The rotating shaft is rotatably connected to the middle of the column.

[0006] As a further improvement to the above technical solution, the motor and the impeller are connected by a transmission mechanism, which includes a pulley that is fixedly connected to the motor output shaft and the impeller hub respectively, and a belt sleeved on the pulley.

[0007] As a further improvement to the above technical solution, the outer frame is provided with a protective net on the air inlet side of the negative pressure fan, and multiple louvers are provided on the air outlet side of the negative pressure fan.

[0008] As a further improvement to the above technical solution, the louvers are provided with connecting rods at both ends, and the louvers are rotatably connected to the outer frame through the connecting rods. The outer frame is provided with limit blocks at the positions above and below each louver.

[0009] As a further improvement to the above technical solution, the outer frame and the air collection plate are made of 275g / m2 hot-dip galvanized iron sheet with a thickness of 1mm; the protective net and the uprights are made of hot-dip galvanized material, and the louvers are made of 275g / m2 hot-dip galvanized material with a thickness of 0.8mm.

[0010] As a further improvement to the above technical solution, the main circuit board is electrically connected to the motor and power supply via wires, and the three-phase voltage detection module is connected to the power input terminal via wires.

[0011] As a further improvement to the above technical solution, the controller adopts a PWM controller and the motor adopts a permanent magnet motor.

[0012] As a further improvement to the above technical solution, the control device is equipped with an alarm electrically connected to the controller, which is used to trigger a buzzer alarm when a phase is lost.

[0013] The beneficial effects of this utility model are: the negative pressure fan provided by this utility model has adjustable speed slow start and phase loss protection functions, which can significantly reduce the starting current, reduce energy consumption, achieve rapid response to phase loss protection, effectively avoid motor burnout, and is suitable for scenarios such as agricultural greenhouses and poultry farming that require efficient ventilation and have high requirements for motor stability. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a structural schematic diagram of a negative pressure fan with adjustable speed and slow start that does not burn out the motor in the event of a phase loss, provided in a preferred embodiment of this utility model. Figure 2 yes Figure 1 The diagram shows the structure of the outer frame of the negative pressure fan with louvers installed on the air outlet side. Figure 3 yes Figure 1 Block diagram of the control circuit principle of a medium negative pressure fan; In the diagram: 11. Outer frame; 121. Hub; 122. Fan blade; 123. Shaft; 13. Motor; 14. Air collection plate; 141. Ventilation hole; 15. Column; 161. Pulley; 162. Belt; 17. Protective net; 18. Louver; 181. Limit stop; 2. Control device; 21. Main circuit board; 22. Controller; 23. Hall sensor; 24. Three-phase voltage detection module; 25. Alarm; 3. Power supply. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0017] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] like Figures 1 to 3 As shown, a preferred embodiment of this utility model provides a negative pressure fan with adjustable speed and slow start, which does not burn out the motor in the event of a phase loss. The fan body includes a fan body, a control device 2, and a power supply 3. The fan body includes an outer frame 11, an impeller disposed inside the outer frame 11, and a motor 13. The motor 13 is connected to the impeller for driving the impeller to rotate. The control device 2 is electrically connected to the motor 13 and the power supply 3. The control device 2 is disposed inside the outer frame 11 and includes a main circuit board 21, a controller 22 electrically connected to the main circuit board 21, and a Hall sensor 23 and a three-phase voltage detection module 24 electrically connected to the controller 22.

[0020] In this embodiment, an air collecting plate 14 and a column 15 are fixedly installed on the inner side of the outer frame 11. The air collecting plate 14 has a circular ventilation hole 141 in the center. The impeller is installed in the ventilation hole 141 of the air collecting plate 14. The impeller includes a hub 121, a plurality of fan blades 122 arranged around the hub 121, and a rotating shaft 123 connected to the center of the hub 121. The rotating shaft 123 is rotatably connected to the middle of the column 15.

[0021] Furthermore, the motor 13 and the impeller are connected by a transmission mechanism. In this embodiment, the transmission mechanism includes a pulley 161 that is fixedly connected to the output shaft of the motor 13 and the hub 121 respectively, and a belt 162 that is sleeved on the pulley 161. The power output by the motor 13 is transmitted to the impeller through the pulley 161 and the belt 162, thereby driving the impeller to rotate. Using the pulley 161 and the belt 162 as the transmission mechanism can reduce noise. The motor 13 can be a high-efficiency and energy-saving permanent magnet motor.

[0022] Furthermore, the outer frame 11 is provided with a protective net 17 on the air inlet side of the negative pressure fan, and multiple louvers 18 are provided on the air outlet side of the outer frame 11. Each louver 18 has connecting rods at both ends, and the louvers 18 are rotatably connected to the outer frame 11 through the connecting rods. When the negative pressure fan starts to supply air, the louvers 18 rotate upwards, and when the negative pressure fan stops supplying air, the louvers 18 automatically fall back under the action of gravity. Preferably, the outer frame 11 is provided with limit blocks 181 at positions above and below each corresponding louver 18 to limit the upward and downward rotation range of the louvers 18.

[0023] Specifically, in this embodiment, the outer frame 11 and the air collection plate 14 are made of 275g / m2 hot-dip galvanized iron plate with a thickness of 1mm; the protective net 17 and the column 15 are made of hot-dip galvanized material, and the louvers 18 are made of 275g / m2 hot-dip galvanized material with a thickness of 0.8mm.

[0024] Specifically, the main circuit board 21 is electrically connected to the motor 13 and the power supply 3 via wires, the three-phase voltage detection module 24 is connected to the input terminal of the power supply 3 via wires, and the controller 22 can be a PWM controller. Preferably, the control device 2 is equipped with an alarm 25 electrically connected to the controller 22, which is used to trigger a buzzer alarm when a phase is lost.

[0025] The working principle of this utility model is as follows: The Hall sensor 23 is used to monitor the speed of the motor 13 and transmits the detected speed signal to the controller 22. The controller 22 then dynamically adjusts the voltage input to the motor 13 to achieve stepless speed regulation of the motor 13 from 0-100%, realizing adjustable-speed slow start of the negative pressure fan (the fan blades 122 rotate slowly when the negative pressure fan is turned on), reducing the starting current surge, extending the life of the motor 13, and saving energy. The three-phase voltage detection module 24 is used to detect the voltage at the input terminal of the power supply 3 and transmits the detected voltage signal to the controller 22. When any phase voltage is missing, the controller 22 cuts off the main circuit board 21 within 0.5 seconds and triggers the alarm 25 to sound an alarm, preventing the motor 13 from burning out. Using the negative pressure fan of this utility model, the starting current is reduced by 60%, and energy consumption is reduced by 35%; the phase loss protection response time is ≤0.5 seconds, effectively preventing the motor 13 from burning out; it supports remote speed regulation and energy consumption monitoring, and is compatible with intelligent control systems.

[0026] The negative pressure fan provided by this utility model has adjustable speed slow start and phase loss protection functions, which can significantly reduce the starting current, reduce energy consumption, achieve rapid response to phase loss protection, and effectively prevent motor 13 from burning out. It is suitable for scenarios such as agricultural greenhouses and poultry farming that require efficient ventilation and have high requirements for motor stability.

[0027] Any descriptions not covered in the above specific embodiments of this utility model belong to the well-known technology in the field, and can be implemented by referring to the well-known technology.

[0028] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A negative pressure fan with adjustable speed and slow start that does not burn out the motor in the event of a phase loss, characterized in that: The device includes a fan body, a control unit, and a power supply. The fan body includes an outer frame, an impeller located inside the outer frame, and a motor. The motor is connected to the impeller for driving the impeller to rotate. The control unit is electrically connected to the motor and the power supply. The control unit is located inside the outer frame and includes a main circuit board, a controller electrically connected to the main circuit board, and a Hall sensor and a three-phase voltage detection module electrically connected to the controller.

2. The adjustable speed slow start negative pressure fan that does not burn out the motor in the event of a phase loss, as described in claim 1, is characterized in that: An air collecting plate and a column are fixedly installed on the inner side of the outer frame. A circular ventilation hole is provided in the center of the air collecting plate. The impeller is installed in the ventilation hole of the air collecting plate. The impeller includes a hub, multiple fan blades arranged around the hub, and a rotating shaft connected to the center of the hub. The rotating shaft is rotatably connected to the middle of the column.

3. The adjustable speed slow start negative pressure fan that does not burn out the motor in the event of a phase loss, as described in claim 2, is characterized in that: The motor and the impeller are connected by a transmission mechanism, which includes a pulley that is fixed to the motor output shaft and the impeller hub respectively, and a belt that is sleeved on the pulley.

4. The adjustable speed slow start negative pressure fan that does not burn out the motor in the event of a phase loss, as described in claim 3, is characterized in that: The outer frame is equipped with a protective net on the air inlet side of the negative pressure fan, and multiple louvers are installed on the air outlet side of the negative pressure fan.

5. The adjustable speed slow start negative pressure fan that does not burn out the motor in the event of a phase loss, as described in claim 4, is characterized in that: The louvers are provided with connecting rods at both ends, and the louvers are rotatably connected to the outer frame through the connecting rods. The outer frame is provided with limit blocks at the positions above and below each louver.

6. The adjustable speed slow start negative pressure fan that does not burn out the motor in the event of a phase loss, as described in claim 4, is characterized in that: The outer frame and air collecting plate are made of 275g / m³. 2 Hot-dip galvanized iron sheet, 1mm thick; the protective netting and posts are made of hot-dip galvanized material, and the louvers are made of 275g / m² steel. 2 It is made of hot-dip galvanized material with a thickness of 0.8mm.

7. The adjustable speed slow start negative pressure fan that does not burn out the motor in the event of a phase loss, as described in claim 1, is characterized in that: The main circuit board is electrically connected to the motor and power supply via wires, and the three-phase voltage detection module is connected to the power input terminal via wires.

8. The adjustable speed slow start negative pressure fan that does not burn out the motor in the event of a phase loss, as described in claim 1, is characterized in that: The controller is a PWM controller, and the motor is a permanent magnet motor.

9. The adjustable speed slow start negative pressure fan that does not burn out the motor in the event of a phase loss, as described in claim 1, is characterized in that: The control device is equipped with an alarm that is electrically connected to the controller, which is used to trigger a buzzer alarm when a phase is lost.

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