A method for preventing jamming of permanent magnet variable frequency fan

Abstract

The invention discloses an anti-stuck control method for a permanent magnet variable frequency fan, aiming to provide an anti-stuck control method for a permanent magnet variable frequency fan with good anti-stuck effect, simple structure and strong practicality. The key points of the technical solution are that, through the impurity monitoring system set up, when dust accumulates on the fan, a conductive circular plate sinks, and a short circuit is formed with the impurity monitoring circuit through a conductive extension body. When the short circuit state is detected by a detector, the motor is controlled to stop rotating, and manual cleaning of impurities or dust is required to improve the overall stability of use; the conductive circular plate is used as a carrier of dust accumulation, and when the force borne by the spring is large, the conductive circular plate sinks, so that the impurity monitoring circuit forms a short circuit, thereby realizing real-time monitoring of impurities, ensuring the normal operation of the fan, and increasing the service life of the fan. The structure is simple and the use effect is strong. The invention is suitable for the technical field of industrial fans.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial fans, and more specifically, to an anti-stuck control method for a permanent magnet variable frequency fan. Background Art

[0002] Industrial fans can most efficiently promote large amounts of air movement, generate ultra-large air volumes, create a moving and circulating airflow field in the space, and can effectively regulate air circulation problems in industrial production workshops.

[0003] The area blown by an industrial fan is directly related to the diameter of the fan. Large industrial fans cover a large area, are easy to clean, and solve the problems of high noise and high energy consumption.

[0004] However, the operating environment of permanent magnet variable frequency industrial fans is usually more complicated. Depending on the dust content of the operating environment, different degrees of dust collection will be formed on the motor shaft. However, the occurrence of dust collection is not a good phenomenon. Not only will there be jamming and safety hazards, but the heat dissipation effect will be relatively weakened, which will aggravate the wear of the motor shaft and even have a greater impact on the overall service life. Summary of the invention

[0005] In view of the deficiencies in the prior art, an object of the present invention is to provide an anti-stuck control method for a permanent magnet variable frequency fan with good anti-stuck effect, simple structure and strong practicality.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a method for preventing jamming of a permanent magnet variable frequency fan, comprising a fan body, the fan body comprising a fan seat, a fan body arranged on the fan seat, a cover plate arranged on the fan seat and an impurity monitoring system arranged on the fan seat, the impurity monitoring system comprising an internal power supply, a left conductive electrode arranged on the fan seat and electrically connected to the internal power supply, a right conductive electrode arranged on the fan seat, a conductive rod having two ends respectively connected to the left and right conductive electrodes, a conductive circular plate arranged above the conductive rod, an elastic support body arranged between the conductive circular plate and the fan seat, and a conductive extension body arranged on the conductive circular plate, the conductive circular plate being a concave structure, the internal power supply, the left conductive electrode, the conductive rod, the right conductive electrode and the conductive circular plate forming an impurity monitoring circuit, the impurity monitoring system also comprising a detector electrically connected to the impurity monitoring circuit and used to detect whether a short circuit occurs,

[0007] The control method comprises the following steps: S1, setting the elastic support coefficient of the elastic support body, when the impurity content in the conductive circular plate is a value K, the conductive circular plate begins to sink; when the impurity content in the conductive circular plate reaches a value P, the conductive extension body contacts the conductive rod;

[0008] S2, the left conductive electrode and the right conductive electrode are powered on, the fan operates normally, and the conductive circular plate is in place;

[0009] S3. Impurities on the conductive circular plate continue to accumulate. When the value K is reached, the conductive circular plate begins to show a downward trend. When the impurities on the conductive circular plate accumulate to the value P, the conductive extension body collides with the conductive rod, forming a short circuit state.

[0010] S4: When the detector detects that the impurity monitoring circuit is in a short-circuit state, the motor is controlled to stop rotating;

[0011] S5. Manually clean the impurities on the conductive circular plate.

[0012] The present invention is further configured as follows: the fan body comprises a shell and a motor disposed in the shell, a dust ring is provided between the motor shaft of the motor and the shell, and a temperature detection mechanism is also provided between the dust ring and the shell.

[0013] The present invention is further configured as follows: the temperature detection mechanism includes a temperature detector arranged between the dust ring and the shell, a fixing structure arranged between the temperature detector and the shell, and a controller electrically connected to the temperature detector and used to control the motor speed.

[0014] The present invention is further configured as follows: the temperature detector includes a connecting part connected to the shell and a probe part embedded in the dust ring, the connecting part includes a mounting ring structure that contacts the inner wall of the shell and bolts for fixing the mounting ring structure to the inner wall of the shell.

[0015] The present invention is further configured as follows: the controller includes a receiving unit, a comparing unit, a processing unit, a timing unit and an output unit, and the receiving unit is electrically connected to the temperature detector.

[0016] The present invention is further configured as follows: the detection steps of the temperature detection mechanism are as follows: S10, setting the predetermined temperature value of the comparison unit to F, the real-time temperature value detected by the temperature detector to F1, and setting the warning time of the timer to T;

[0017] S11, when there are many impurities accumulated on the peripheral side of the motor shaft, the friction between the motor shaft and the dustproof ring increases, and the temperature of the peripheral side continues to rise. The temperature detector is used to detect the temperature of the dustproof ring, and the detected value is F1;

[0018] S12, the receiving unit receives the electrical signal from the temperature detector, and compares the received electrical signal through the comparing unit;

[0019] S13, if F>F1, it is determined that the temperature is at a normal value and there is no need to operate the motor speed;

[0020] S14, if F1 ≥ F, it is determined that the temperature exceeds the normal value, and the speed of the motor needs to be reduced;

[0021] S15, the time when the temperature is F1 is T1 through the timing unit. If T1>T, it is determined that the motor is in a high dust collection state, and a signal for cleaning impurities on the motor shaft side is output.

[0022] S16. Complete the above operations.

[0023] By adopting the above technical solution, the beneficial effects are as follows: 1. By setting up the impurity monitoring system, when dust accumulates on the fan, the conductive circular plate sinks and forms a short circuit with the impurity monitoring circuit through the conductive extension. When the detector detects the short circuit state, the motor is controlled to stop rotating, and impurities or dust need to be cleaned manually, thereby improving the overall stability of use;

[0024] 2. The present invention combines the actual situation and uses the conductive circular plate as a carrier of dust accumulation. When the force borne by the spring is large, the conductive circular plate sinks, so that the impurity monitoring circuit forms a short circuit, thereby realizing real-time monitoring of impurities, ensuring the normal operation of the fan, and increasing the service life of the fan. The structure is simple and the use effect is strong;

[0025] 3. In the embodiment of the present invention, a temperature detection mechanism is provided between the dustproof ring and the housing to detect the temperature between the motor shaft and the dustproof ring. When dust is concentrated, the friction force increases, which increases the heat between the motor shaft and the dustproof ring, thereby accelerating the aging of the dustproof ring and causing the dustproof effect to deteriorate. When the dustproof ring is detected, the comparison unit is used as the basis for detection and comparison, and the judgment standard is provided. Then, by controlling the motor speed and the duration of high temperature, it is judged whether the impurity content is large and whether it needs to be cleaned, thereby achieving protection of the motor;

[0026] 4. The present invention forms a double anti-stuck effect through inner and outer dust prevention measures, has strong practicality, reduces the impact of impurities and dust on the motor, has a simple structure, and forms double protection for the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a schematic structural diagram of an impurity monitoring system according to an anti-stuttering control method for a permanent magnet variable frequency fan.

[0028] Figure 2 The present invention is a schematic diagram of the temperature detection mechanism structure of an anti-stuttering control method for a permanent magnet variable frequency fan.

[0029] The reference numerals in the figure are as follows: 1. fan seat; 2. fan body; 3. cover plate; 40. internal power supply; 41. left conductive electrode; 42. right conductive electrode; 43. conductive rod; 44. conductive circular plate; 45. elastic support body; 440. conductive extension body; 50. motor shaft; 51. dustproof ring; 53. controller; 60. probe part; 61. lifting platform structure; 62. lifting motor. DETAILED DESCRIPTION

[0030] Reference Figure 1 to Figure 2 An embodiment of an anti-stuttering control method for a permanent magnet variable frequency fan of the present invention is further described.

[0031] For ease of explanation, spatial relative terms such as "upper", "lower", "left", "right" and the like are used in the embodiments to illustrate the relationship of one element or feature shown in the figure relative to another element or feature. It should be understood that, in addition to the orientation shown in the figure, the spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "on" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0032] Furthermore, relational terms such as “first” and “second” and the like are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0033] A method for preventing stuck of a permanent magnet variable frequency fan comprises a fan body, wherein the fan body comprises a fan seat 1, a fan body 2 arranged on the fan seat 1, a cover plate 3 arranged on the fan seat 1 and an impurity monitoring system arranged on the fan seat 1, wherein the impurity monitoring system comprises an internal power supply 40, a left conductive electrode 41 arranged on the fan seat 1 and electrically connected to the internal power supply 40, a right conductive electrode 42 arranged on the fan seat 1, a conductive rod 43 whose two ends are respectively connected to the left and right conductive electrodes 42, a conductive circular plate 44 arranged above the conductive rod 43, an elastic support body 45 arranged between the conductive circular plate and the fan seat 1, and a conductive extension body 440 arranged on the conductive circular plate 44, wherein the conductive circular plate 44 is a concave structure, and the internal power supply, the left conductive electrode 41, the conductive rod 43, the right conductive electrode 42 and the conductive circular plate 44 form an impurity monitoring circuit, and the impurity monitoring system further comprises a detector electrically connected to the impurity monitoring circuit and used to detect whether a short circuit occurs.

[0034] The control method comprises the following steps: S1, setting the elastic support coefficient of the elastic support body 45, when the impurity content in the conductive circular plate is a value K, the conductive circular plate begins to sink; when the impurity content in the conductive circular plate reaches a value P, the conductive extension body 440 conflicts with the conductive rod 43;

[0035] S2, the left conductive electrode 41 and the right conductive electrode 42 are powered on, the fan operates normally, and the conductive circular plate is in place;

[0036] S3, impurities on the conductive circular plate continue to accumulate, and when the value K is reached, the conductive circular plate begins to show a downward trend, until the impurities on the conductive circular plate accumulate to the value P, the conductive extension 440 and the conductive rod 43 collide, forming a short circuit state;

[0037] S4: When the detector detects that the impurity monitoring circuit is in a short-circuit state, the motor is controlled to stop rotating;

[0038] S5. Manually clean the impurities on the conductive circular plate 44.

[0039] By setting up the impurity monitoring system, when dust accumulates on the fan, the conductive circular plate 44 sinks and forms a short circuit with the impurity monitoring circuit through the conductive extension 440. When the detector detects the short circuit state, the motor is controlled to stop rotating, and the impurities or dust need to be cleaned manually, thereby improving the overall stability of use;

[0040] The present invention is based on actual conditions and uses the conductive circular plate 44 as a carrier of dust accumulation. When the force borne by the spring is large, the conductive circular plate 44 sinks, causing the impurity monitoring circuit to short-circuit, thereby realizing real-time monitoring of impurities, ensuring the normal operation of the fan, and increasing the service life of the fan. The structure is simple and the use effect is strong.

[0041] The present invention is further configured such that the fan body includes a shell and a motor disposed in the shell, a dust ring 51 is provided between the motor shaft 50 of the motor and the shell, and a temperature detection mechanism is also provided between the dust ring 51 and the shell.

[0042] The present invention is further configured such that the temperature detection mechanism includes a temperature detector disposed between the dust ring 51 and the housing, a fixing structure disposed between the temperature detector and the housing, and a controller 53 electrically connected to the temperature detector and used to control the motor speed.

[0043] The present invention is further configured such that the temperature detector includes a connecting portion connected to the shell and a probe portion 60 embedded in the dust ring 51, wherein the connecting portion includes a mounting ring structure that contacts the inner wall of the shell and bolts for fixing the mounting ring structure to the inner wall of the shell.

[0044] The present invention is further configured such that the controller 53 includes a receiving unit, a comparing unit, a processing unit, a timing unit and an output unit, and the receiving unit is electrically connected to the temperature detector.

[0045] The present invention is further configured that the detection steps of the temperature detection mechanism are as follows: S10, setting the predetermined temperature value of the comparison unit to F, the real-time temperature value detected by the temperature detector to F1, and setting the warning time of the timer to T;

[0046] S11, when there are many impurities accumulated on the peripheral side of the motor shaft 50, the friction between the motor shaft 50 and the dustproof ring 51 increases, and the temperature of the peripheral side continues to rise. The temperature detector detects the temperature of the dustproof ring 51, and the detected value is F1;

[0047] S12, the receiving unit receives the electrical signal from the temperature detector, and compares the received electrical signal through the comparing unit;

[0048] S13, if F>F1, it is determined that the temperature is at a normal value and there is no need to operate the motor speed;

[0049] S14, if F1 ≥ F, it is determined that the temperature exceeds the normal value, and the speed of the motor needs to be reduced;

[0050] S15, the relative position between the dust ring 51 and the motor shaft 50 is adjusted by controlling the lifting platform structure 61 through the output unit. After the adjustment, the motor is operated normally. After T0 time, the temperature detector detects the temperature of the dust ring 51. If F>F1, it is determined that the temperature is at a normal value, and there is no need to operate the motor speed; if F1≥F, it is determined that the temperature exceeds the normal value, and the next step is entered;

[0051] S16, using a timing unit to calculate the time when the temperature is F1 as T2, if T2>T, it is determined that the motor is in a high dust collection state, and a signal for cleaning impurities on the motor shaft 50 is output;

[0052] S16. Complete the above operations.

[0053] In the embodiment of the present invention, a temperature detection mechanism is provided between the dustproof ring 51 and the shell to detect the temperature between the motor shaft 50 and the dustproof ring 51. When dust is concentrated, the friction force increases, which increases the heat between the motor shaft 50 and the dustproof ring 51, thereby accelerating the aging of the dustproof ring 51 and causing the dustproof effect to deteriorate. When the dustproof ring 51 is detected, a comparison unit is used as the basis for detection and comparison, and a standard for evaluation is provided. Then, by controlling the motor speed and the duration of high temperature, it is determined whether the impurity content is large and whether cleaning is required, thereby protecting the motor.

[0054] The present invention forms a double anti-stuck effect through inner and outer dust prevention measures, has strong practicality, reduces the influence of impurities and dust on the motor, has a simple structure, and forms double protection for the motor.

[0055] In an embodiment of the present invention, an adjustment mechanism for adjusting the longitudinal position of the dust ring 51 is also provided in the fan seat 1, and the adjustment mechanism includes a lifting platform structure 61 movably connected to the shell and a lifting motor 62 for driving the lifting platform structure 61 to rise and fall reciprocatingly. The lifting platform structure 61 is movably connected to the shell, the temperature detector and the dust ring 51 are both connected to the lifting platform structure 61, and the lifting motor 62 is electrically connected to the output unit. The shell adopts a split structure, and the longitudinal position of the lifting platform structure 61 is regulated by the lifting platform structure 61 and the lifting motor 62 structure, which can remove dust between the dust ring 51 and the motor shaft 50. If the temperature of the dust ring 51 continues to rise after T0 time, it is judged that there is a high dust accumulation between the dust ring 51 and the motor shaft 50, and manual cleaning is required.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preventing jamming of a permanent magnet variable frequency fan, comprising a fan body, characterized in that: The fan body comprises a fan seat (1), a fan body (2) arranged on the fan seat (1), a cover plate (3) arranged on the fan seat (1), and an impurity monitoring system arranged on the fan seat (1), wherein the impurity monitoring system comprises an internal power supply (40), a left conductive electrode (41) arranged on the fan seat (1) and electrically connected to the internal power supply (40), a right conductive electrode (42) arranged on the fan seat (1), a conductive rod (43) having two ends respectively connected to the left and right conductive electrodes (42), and a conductive rod (43) arranged on the conductive rod (43). The upper conductive circular plate (44), an elastic support body (45) arranged between the conductive circular plate (44) and the fan seat (1), and a conductive extension body (440) arranged on the conductive circular plate (44), the conductive circular plate (44) is a concave structure, the internal power supply (40), the left conductive electrode (41), the conductive rod (43), the right conductive electrode (42) and the conductive circular plate (44) form an impurity monitoring circuit, and the impurity monitoring system also includes a detector electrically connected to the impurity monitoring circuit and used to detect whether a short circuit occurs. The control method comprises the following steps: S1, setting the elastic support coefficient of the elastic support body (45), when the impurity content in the conductive circular plate (44) is a value K, the conductive circular plate (44) starts to sink; when the impurity content in the conductive circular plate (44) reaches a value P, the conductive extension body (440) contacts the conductive rod (43); S2, the left conductive electrode (41) and the right conductive electrode (42) are powered on, the fan operates normally, and the conductive circular plate (44) is in its original position; S3, impurities continue to accumulate on the conductive circular plate (44), and when the value K is reached, the conductive circular plate (44) begins to show a downward trend, until the impurities on the conductive circular plate (44) accumulate to the value P, the conductive extension body (440) and the conductive rod (43) collide with each other, forming a short circuit state; S4: When the detector detects that the impurity monitoring circuit is in a short-circuit state, the motor is controlled to stop rotating; S5. Manually clean the impurities on the conductive circular plate (44).

2. The anti-stuttering control method of a permanent magnet variable frequency fan according to claim 1, characterized in that: The fan body comprises a shell and a motor disposed in the shell, a dust ring (51) is provided between the motor shaft (50) of the motor and the shell, and a temperature detection mechanism is also provided between the dust ring (51) and the shell.

3. The anti-stuttering control method of a permanent magnet variable frequency fan according to claim 2, characterized in that: The temperature detection mechanism comprises a temperature detector arranged between the dustproof ring (51) and the shell, a fixing structure arranged between the temperature detector and the shell, and a controller (53) electrically connected to the temperature detector and used for controlling the motor speed.

4. The anti-stuttering control method of a permanent magnet variable frequency fan according to claim 3, characterized in that: The temperature detector comprises a connection part connected to the shell and a probe part (60) embedded in a dustproof ring (51), wherein the connection part comprises a mounting ring structure abutting against the inner wall of the shell and bolts for fixing the mounting ring structure to the inner wall of the shell.

5. The anti-stuttering control method of a permanent magnet variable frequency fan according to claim 4, characterized in that: The controller (53) comprises a receiving unit, a comparing unit, a processing unit, a timing unit and an output unit, and the receiving unit is electrically connected to the temperature detector.

6. The anti-stuttering control method of a permanent magnet variable frequency fan according to claim 5, characterized in that: The fan seat (1) is also provided with an adjustment mechanism for adjusting the longitudinal position of the dust ring (51), the adjustment mechanism comprising a lifting platform structure (61) movably connected to the shell and a lifting motor (62) for driving the lifting platform structure (61) to move up and down, the lifting platform structure (61) being movably connected to the shell, the temperature detector and the dust ring (51) being connected to the lifting platform structure (61), and the lifting motor (62) being electrically connected to the output unit.

7. The anti-stuttering control method of a permanent magnet variable frequency fan according to claim 6, characterized in that: The detection steps of the temperature detection mechanism are as follows: S10, setting the predetermined temperature value of the comparison unit to F, the real-time temperature value detected by the temperature detector to F1, and setting the warning time of the timer to T; S11, when a large amount of impurities are accumulated on the peripheral side of the motor shaft (50), the friction between the motor shaft (50) and the dustproof ring (51) increases, and the temperature of the peripheral side continues to rise. The temperature of the dustproof ring (51) is detected by a temperature detector, and the detected value is F1; S12, the receiving unit receives the electrical signal from the temperature detector, and compares the received electrical signal through the comparing unit; S13, if F>F1, it is determined that the temperature is at a normal value and there is no need to operate the motor speed; S14, if F1 ≥ F, it is determined that the temperature exceeds the normal value, and the speed of the motor needs to be reduced; S15, controlling the lifting platform structure (61) through the output unit to adjust the relative position between the dust ring (51) and the motor shaft (50), and after the adjustment is completed, the motor is operated normally, and after T0 time, the temperature detector detects the temperature of the dust ring (51), and if F>F1, it is determined that the temperature is at a normal value, and there is no need to operate the speed of the motor; if F1≥F, it is determined that the temperature exceeds the normal value, and the next step is entered; S16, using a timing unit to calculate the time when the temperature is F1 as T2, if T2>T, it is determined that the motor is in a high dust collection state, and a signal for cleaning impurities on the peripheral side of the motor shaft (50) is output; S17. Complete the above operations.

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