Variable-speed fan driving protection device and method

Abstract

The invention discloses a variable-speed fan driving protection device and method, and particularly relates to the technical field of driving equipment.The device comprises a variable-speed motor, a motor mounting frame and a protection cover, an annular dust remaining cavity is formed in the protection cover, and a shielding disc is fixedly mounted at the area, corresponding to the annular dust remaining cavity, of a motor shaft; a baffle is arranged on the side, corresponding to the motor shell, of the shielding disc and fixedly connected with the protection cover, a dust remaining structure is arranged on the inner wall of the annular dust remaining cavity, and a viscous structure is arranged on the surface of the dust remaining structure. According to the invention, the shielding disc is arranged to block dust particles, so that the entering dust particles firstly fall on the shielding disc, and the dust particles are thrown to the dust retaining structure on the inner surface of the annular dust retaining cavity by virtue of the rotation of the shielding disc, so that the variable-speed motor body is further effectively protected; therefore, the safety and the stability of the variable-speed motor in use in an extreme environment are enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of drive equipment, and more specifically, to a variable speed fan drive protection device and method. Background Art

[0002] A fan is a machine that relies on input mechanical energy to increase gas pressure and discharge gas. It is a driven fluid machine. There are many types of fans with different structural types. But no matter what kind of fan equipment it is, it is mainly composed of an impeller and a drive device for driving the impeller to rotate. Among them, the drive device mainly uses an electric motor as a power source, and a variable speed fan uses a frequency converter or other speed regulating device to achieve precise control of the drive motor speed, thereby changing the speed of the impeller, and then changing the speed of the motor by adjusting the power supply frequency or voltage, thereby adjusting the air volume and pressure of the fan. It is widely used in industrial, commercial and civil buildings.

[0003] Since the variable speed fan can adjust the air volume only by controlling the speed of the drive motor, there is no need to use speed control equipment and other structures to connect the impeller and the output shaft of the drive motor, making the overall fan structure relatively compact and saving equipment space.

[0004] Among them, in order to effectively support and protect the drive motor, it is necessary to use supporting equipment to firmly install the drive motor to ensure that the drive motor can operate stably. However, for some harsh operating environments (such as steel mills, coal-fired power plants, waste incineration plants, and high-temperature, high-dust particle operating environments such as cooling and dust removal in mining), in order to ensure the stable operation of the drive motor and prevent external dust particles from entering the drive motor and affecting the normal use of the motor, it is necessary to use a highly sealed, high-quality drive motor and set up an effective protection structure for the drive motor.

[0005] Among them, for high-sealing drive motors, corresponding sealing structures, such as packing seals and labyrinth seals, are arranged between the motor shaft and the motor housing, and the sealing structure is arranged on the outside of the bearing structure between the drive motor housing and the motor shaft to provide corresponding protection for the bearings. When such drive motors are in normal use, for example, when the motor rotates stably, the impeller mass is balanced, and the fan is used in a relatively stable environment, the drive shaft of the drive motor can maintain stable coaxial rotation, and the motor shaft will not generate unbalanced pressure with the sealing structure and the bearing structure.

[0006] However, in some complex operating environments such as high temperature and high dust particles, especially after the use of the fan equipment trial parts, the impeller will be affected by many conditions, resulting in uneven texture and affecting the center of mass position (for example, after long-term use, dust particles and impeller blades form uncontrollable impacts resulting in uneven wear, dust particles adhere to the impeller in some high humidity environments, and errors in the production of the impeller itself). In this case, the rotation of the impeller will cause the motor shaft to deviate slightly from the axis due to the problem of center of mass offset (for example, under the action of centrifugal force, the motor shaft end tends to deviate in the direction of the centrifugal force).

[0007] Especially when the variable speed fan needs to run at high speed and constantly adjust the speed of the driving motor to adjust the speed of the impeller, the degree of offset deformation of the above-mentioned motor shaft will be relatively increased, and uncontrollable radial vibration will be formed. At this time, at the contact position between the motor shaft and the motor housing, due to the offset trend of the motor shaft, the fitting clearance between the motor shaft and the sealing structure will increase on one side and decrease on the other side. When the above-mentioned gap increases, dust particles can easily enter the area between the motor shaft and the sealing structure.

[0008] Although the sealing structure can temporarily block dust particles from entering the linear motor, the gap constantly changes due to the continuous rotation of the motor shaft, and the dust particles that enter between the motor shaft and the sealing structure will also continue to move. If the dust particles contain harder particles, such as metal microparticles, tiny sand particles, and mineral dust particles, friction damage will be caused between the motor shaft and the sealing structure, thereby affecting the matching stability between the motor shaft and the sealing structure and the sealing effect of the sealing structure. In severe cases, it may even cause structural damage to the drive motor, aggravate the vibration of the motor shaft, and affect the service life of the drive motor. Summary of the invention

[0009] The present invention provides a variable speed fan drive protection device and method, and aims to solve the problem that when the motor shaft of the variable speed fan produces offset vibration, the matching clearance between the motor shaft and the sealing structure will increase on one side, making it easy for dust particles to enter the area between the motor shaft and the sealing structure, affecting the matching stability between the motor shaft and the sealing structure, and affecting the sealing effect of the sealing structure.

[0010] To achieve the above-mentioned object, the present invention provides the following technical solutions: a variable speed fan drive protection device, comprising a variable speed motor, a motor mounting frame and a protective cover, the variable speed motor comprising a motor housing and a motor shaft, a shaft sealing assembly being arranged between the motor housing and the motor shaft, the motor housing and the protective cover being fixedly mounted on the motor mounting frame, the protective cover covering the outside of the output end of the motor shaft, and the protective cover corresponding to one side of the motor housing and the end of the motor housing being engaged with each other;

[0011] An annular dust cavity is arranged inside the protective cover, a baffle plate is fixedly installed at the area of ​​the motor shaft corresponding to the annular dust cavity, a baffle plate is arranged on the side of the baffle plate corresponding to the motor housing, the baffle plate is fixedly connected to the protective cover, the edge of the baffle plate is located within the area covered by the annular dust cavity along the length direction of the motor shaft, a dust retaining structure is arranged on the inner wall of the annular dust cavity, and a sticky structure is arranged on the surface of the dust retaining structure.

[0012] In a preferred embodiment, a mounting sleeve is provided at the center of the shielding disk, and the mounting sleeve is fixedly mounted on the motor shaft. The shielding disk is a conical cover structure, and the edge of the shielding disk is arranged away from the motor housing.

[0013] In a preferred embodiment, an elastic ring sheet is fixedly installed at the edge of the baffle plate. The elastic ring sheet is a thin sheet structure. The edge of the elastic ring sheet is bent toward the side away from the motor housing. A plurality of groups of counterweight protrusions are arranged at the edge of the elastic ring sheet close to the motor housing. The plurality of groups of counterweight protrusions are evenly distributed along the circumferential direction of the elastic ring sheet.

[0014] In a preferred embodiment, the dust retaining structure is a belt-type dust retaining structure, the surface of which is coated with grease to form a viscous structure. The dust retaining structure is surrounded by an annular dust retaining cavity, and two groups of extension channels are provided in the protective cover. The two ends of the dust retaining structure extend out of the protective cover through the two groups of extension channels respectively, and a groove structure that slides and engages with the edge of the dust retaining structure is provided on the inner wall of the dust retaining structure, and the dust retaining structure slides along the inner wall of the annular dust retaining cavity.

[0015] In a preferred embodiment, two groups of winding drums are rotatably installed on the outer side of the annular dust retaining chamber, and the two ends of the dust retaining structure are respectively connected to the two groups of winding drums to form a winding. A shielding cover is provided on the outer side of the winding drum, and a rotating drive structure is provided on the winding drum.

[0016] In a preferred embodiment, the extension channel is located above the protective cover, an oil storage chamber is provided at the top of the extension channel, grease is stored in the oil storage chamber, and the dust retaining structure passes through the grease in the oil storage chamber.

[0017] In a preferred embodiment, an auxiliary end cover is fixedly installed in the middle of the side of the protective cover away from the motor housing, the output end of the motor shaft passes through the protective cover and the auxiliary end cover, and a reaction sleeve is fixedly installed in the area of ​​the motor shaft located inside the auxiliary end cover. A group of magnetic parts are respectively provided on the outer circumferential surface of the reaction sleeve and the inner circumferential surface of the auxiliary end cover, and the magnetic poles on the corresponding sides of the two groups of magnetic parts are the same.

[0018] In a preferred embodiment, multiple groups of grooves are provided inside the auxiliary end cover, a buffer slider is slidably installed in each groove, each group of magnetic parts in the auxiliary end cover is fixedly installed on the corresponding buffer slider, and a buffer elastic part is provided between the buffer slider and the groove of the auxiliary end cover.

[0019] In a preferred embodiment, a closed structure is provided between the protective cover and the motor housing, the closed structure is a rubber pad structure, and the closed structure is adapted to the end shape of the variable speed motor, a protective shell is fixedly mounted on the motor mounting frame, the protective shell covers the outside of the variable speed motor, and a vibration reduction structure is provided between the variable speed motor and the motor mounting frame and between the variable speed motor and the protective shell.

[0020] A variable speed fan drive protection method comprises the following steps:

[0021] Step 1: Dust particles that enter the protective cover through the gap between the auxiliary end cover and the motor shaft fall onto the shielding plate and are blocked by the shielding plate;

[0022] Step 2: The dust particles are moved around by the centrifugal force through the rotation of the shielding disk, and fall on the dust retaining structure in the annular dust retaining cavity, and are adhered by the sticky structure on the surface of the dust retaining structure;

[0023] Step 3: Pull one end of the dust retaining structure to make the dust retaining structure slide along a circular trajectory in the annular dust retaining cavity, and make the new dust retaining structure enter the annular dust retaining cavity.

[0024] The beneficial effects of the present invention are as follows: the present invention blocks dust particles by arranging a shielding disk, so that the incoming dust particles first fall on the shielding disk, and with the help of the rotation of the shielding disk, the dust particles attached thereto are driven to produce rotational motion, and then under the action of centrifugal force, the dust particles are thrown to the dust retaining structure on the inner surface of the annular dust retaining chamber, and the dust particles are attached thereto. Therefore, even if the impeller center of mass of the fan structure is shifted due to various factors, causing the fan to generate vibration of the motor shaft deviating from the rotation center direction when running at high speed, and the uneven pressure of the motor shaft at the shaft sealing assembly causes a gap, with the cooperation of the shielding disk and the annular dust retaining chamber, dust particles are not easy to enter the gap formed between the above-mentioned motor shaft and the corresponding structure of the motor housing, thereby effectively protecting the variable speed motor body, thereby enhancing the safety and stability of the variable speed motor when used in extreme environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 It is a schematic diagram of the coordination among the variable speed motor, the mounting frame and the protective cover of the present invention.

[0027] Figure 3 This is a diagram showing the matching state between the motor shaft and the internal structure of the protective cover of the present invention.

[0028] Figure 4 It is a schematic diagram of the matching state between the shielding disk and the annular dust retaining chamber of the present invention.

[0029] Figure 5 It is a three-dimensional diagram of the shielding plate of the present invention.

[0030] Figure 6 This is a schematic diagram of the overall structure of the belt-type dust-retaining structure used in the present invention.

[0031] Figure 7 It is a schematic structural diagram of the belt-type dust retaining structure of the present invention, after it goes around the annular dust retaining chamber once and is led out of the protective cover.

[0032] Figure 8 For the present invention Figure 6 A-section structure enlarged view.

[0033] Fig. 9 The figure is a schematic diagram of the structure of the auxiliary end cover after improvement in the present invention.

[0034] Fig.10 It is a schematic diagram of the application of the present invention to a fan structure.

[0035] Fig.11 The present invention is a schematic structural diagram of adding a protective housing outside the variable speed motor.

[0036] Fig.12 It is a schematic diagram of the structural design for synchronously protecting the coupling when the present invention is directed to a transmission shaft structure with a coupling.

[0037] Fig.13 The figure is a flow chart of the protection method of the present invention.

[0038] The accompanying drawings are marked as follows: 1. variable speed motor; 11. motor housing; 12. motor shaft; 13. shaft sealing assembly; 2. motor mounting bracket; 21. protective housing; 22. vibration reduction structure; 3. protective cover; 31. annular dust chamber; 311. dust retaining structure; 312. winding drum; 32. shielding plate; 321. elastic ring plate; 322. counterweight protrusion; 33. auxiliary end cover; 331. buffer slider; 332. buffer elastic member; 34. closed structure; 35. baffle; 36. reaction sleeve; 361. magnetic member; 37. extension channel; 371. oil storage chamber; 4. fan structure; 41. impeller shaft; 42. coupling. DETAILED DESCRIPTION

[0039] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0040] Refer to the instruction manual Figures 1 to 12 A variable speed fan drive protection device includes a variable speed motor 1, a motor mounting frame 2 and a protective cover 3, wherein the variable speed motor 1 includes a motor housing 11 and a motor shaft 12, a shaft sealing assembly 13 is arranged between the motor housing 11 and the motor shaft 12, and the output end of the motor shaft 12 (i.e., the end that needs to be connected to the impeller in the fan structure 4 for transmission) extends out of the motor housing 11. The above is the basic structure of the motor product, and this embodiment will not be explained in detail. The motor housing 11 and the protective cover 3 are both fixedly mounted on the motor mounting frame 2 (if there is a suitable structure on the motor mounting frame 2, the protective cover 3 can be directly installed, if there is no suitable structure, it can be indirectly installed through other connecting structures to ensure that the protective cover 3 and the motor housing 11 are fixed to each other), and the protective cover 3 covers the outside of the output end of the motor shaft 12, and the protective cover 3 is engaged with the end of the motor housing 11 on one side corresponding to the motor housing 11, and is provided with a closing structure 34, which is a rubber pad structure, and the closing structure 34 is adapted to the end shape of the variable speed motor 1, thereby forming a close contact, forming a seal between the protective cover 3 and the motor housing 11, and forming a buffer between the variable speed motor 1 and the protective cover 3 to avoid vibration between the two, and an auxiliary end cover 33 is fixedly installed in the middle of the side of the protective cover 3 away from the motor housing 11, and the output end of the motor shaft 12 passes through the protective cover 3 and the auxiliary end cover 33, so that the protective cover 3 can effectively cover and protect the shaft sealing assembly 13 between the output end of the motor shaft 12 and the motor housing 11.

[0041] At the same time, an annular dust chamber 31 is provided inside the protective cover 3, a baffle plate 32 is fixedly installed at the area of ​​the motor shaft 12 corresponding to the annular dust chamber 31, a baffle plate 35 is provided on one side of the baffle plate 32 corresponding to the motor housing 11, the baffle plate 35 is fixedly connected to the protective cover 3, and the motor shaft 12 passes through the baffle plate 35, that is, the baffle plate 35 is located behind the baffle plate 32 and between the baffle plate 32 and the shaft sealing assembly 13, and the baffle plate 32 and the baffle plate 35 are close to each other and have an assembly gap to avoid friction between the baffle plate 32 and the baffle plate 35, and at the same time, the edge of the baffle plate 32 is located at the annular dust chamber 31. Within the area covered by the annular dust chamber 31 along the length direction of the motor shaft 12, a dust retaining structure 311 is arranged on the inner wall of the annular dust chamber 31. The dust retaining structure 311 is a material that can adsorb dust particles, such as a material with a microporous structure (the surface is covered with activated carbon), or a sticky structure with a sticky inner surface (for example, materials such as glue or grease are arranged on the surface). In addition, an assembly gap can be left between the motor shaft 12 and the baffle 35, and between the motor shaft 12 and the reaction sleeve 36. That is, the setting of the above structure will not increase the contact friction of the motor shaft 12.

[0042] By adopting the above scheme, in actual use, even if due to a harsh environment, some dust particles or other hard particles enter the protective cover 3 from the gap between the rear of the impeller of the fan structure 4 and the auxiliary end cover 33 and the motor shaft 12, the dust particles will be blocked by the shielding plate 32 and then fall on the shielding plate 32. The shielding plate 32 is installed on the motor shaft 12 and will rotate with the motor shaft 12 in actual use, so that the dust particles attached thereto can be driven to rotate, and then under the action of centrifugal force, the dust particles can be thrown to the dust retaining structure 311 on the inner surface of the annular dust retaining cavity 31 and attached thereto. Since the shielding plate 32 is in a continuous rotation state during use, when the dust particles move to the edge of the shielding plate 32 and break away from the shielding plate 3 2, it will have a speed of moving outward, and will not move toward the gap behind the shielding plate 32, thereby further preventing dust from moving toward the matching area between the motor shaft 12 and the end of the motor housing 11. Therefore, even if the impeller center of mass of the fan structure 4 is offset due to various factors, causing the motor shaft 12 to vibrate in the direction of the rotation center when the fan is running at high speed, the motor shaft 12 is unevenly pressurized at the shaft seal assembly 13 (or other structures such as the sealing cover) and causes a gap. With the cooperation of the shielding plate 32 and the annular dust chamber 31, dust particles are not easy to enter the gap formed between the above-mentioned motor shaft 12 and the corresponding structure of the motor housing 11, thereby further effectively protecting the variable speed motor 1 body, thereby enhancing the safety and stability of the variable speed motor 1 when used in extreme environments.

[0043] For further information, please refer to the attached manual. Figures 3 to 5A mounting sleeve is provided at the center of the shielding disk 32, and the mounting sleeve is fixedly mounted on the motor shaft 12. The shielding disk 32 is a conical cover structure, and the edge of the shielding disk 32 is arranged away from the motor housing 11, so that a conical inner wall is formed on the side of the shielding disk 32 that receives the dust particles. During the rotation of the shielding disk 32, the dust particles are thrown out at the edge of the shielding disk 32 under the action of centrifugal force, and also have a movement away from the motor housing 11. Therefore, it can further prevent the dust particles from moving toward the matching position of the motor shaft 12 and the motor housing 11, thereby improving the protection effect.

[0044] It should be noted that, in the present embodiment, the shielding plate 32 can be made of a plastic structure, and the shielding plate 32 does not need to be transmitted, so the mounting sleeve at the center of the shielding plate 32 can be firmly installed with the motor shaft 12 by interference fit. If necessary, screws or keys can be added to strengthen the fixation. The shielding plate 32 itself is light in texture and will hardly affect the rotation of the motor shaft 12. At the same time, the solution provided in the present embodiment does not make close contact with the motor shaft 12, will not form resistance friction on the motor shaft 12, and will not form friction loss, which can greatly improve the service life of the device, and there is no need to improve the variable speed motor 1 itself. In actual production, according to the commonly used models of variable speed motors 1, corresponding protective covers 3 and motor shafts 12 can be set for adaptation. The structure used is also relatively small. Compared with improving the existing variable speed motor 1, the cost is low and the protection effect is better. Moreover, the present device is only arranged near the matching point between the motor shaft 12 and the motor housing 11, and does not need to occupy a large space. It can be adapted to a more compact use environment, such as the one attached to the instruction manual. Fig.10 When the device is applied to the fan structure 4, the protective cover 3 does not occupy a large space. In addition, in addition to being applicable to compact fan structures 4, this embodiment can also be simply modified for some motor shafts 12 that are long and the transmission components use a coupling 42, that is, the motor shaft 12 is connected to the impeller shaft 41 of the fan structure 4 through the coupling 42. The coupling 42 can be arranged behind the baffle 35. Fig.12 The coupling 42 can also be effectively protected by means of the cooperation of the shielding plate 32 and the annular dust chamber 31 (since a certain amount of activity needs to be retained in the two connecting structures of the coupling 42, a certain amount of clearance and movement will be retained. In a high temperature, high humidity or high dust environment, the coupling 42 may fail due to corrosion, wear or blockage. The direct drive design can avoid these problems. Setting the protective cover 3 on the outside of the coupling 42 can also provide joint protection for the coupling 42). It has strong applicability and high practicality.

[0045] Furthermore, in the above-mentioned embodiment, although the fan structure 4 has been well protected in actual use, and the dust particles that can enter the annular dust chamber 31 are relatively few, after long-term use, the dust particles retained in the annular dust chamber 31 will gradually increase. In actual use, the dust retaining structure 311 can be replaced when the equipment is regularly disassembled for maintenance, and the amount of retained dust particles can be increased by increasing the space of the annular dust chamber 31. However, the above-mentioned method is not suitable for use scenarios with space requirements. Therefore, this embodiment also provides the following technical solutions. For details, refer to the attached manual. Figures 6 to 8 An elastic ring piece 321 is fixedly installed at the edge of the shielding plate 32. The elastic ring piece 321 is elastic and has a thin sheet structure. The edge of the elastic ring piece 321 is bent toward the side away from the motor housing 11. A plurality of groups of counterweight convex points 322 are arranged at the edge of the elastic ring piece 321 close to the motor housing 11. The plurality of groups of counterweight convex points 322 are evenly distributed along the circumferential direction of the elastic ring piece 321. When the elastic ring piece 321 rotates, the edge of the elastic ring piece 321 and the counterweight convex points 322 tend to move away from the motor shaft 12 in the radial direction due to the influence of centrifugal force. Therefore, the bending arc of the edge of the elastic ring piece 321 will occur. In actual use, the final detachment point of the dust particles is at the edge of the elastic ring piece 321. Since the elastic ring piece 321 is elastic, as the speed of the variable speed motor 1 is adjusted during use, the actual speed of the elastic ring piece 321 also changes relatively, and the centrifugal force on the elastic ring piece 321 also changes, so that the bending curvature of the elastic ring piece 321 also changes continuously, and then the movement direction of the dust particles that finally detach from the elastic ring piece 321 changes, so that the dust particles can fall on a wider inner wall area of ​​the dust retaining structure 311, and therefore, the amount of dust particles that can be retained is also increased.

[0046] In addition, the present embodiment also provides the following scheme, which can timely process the dust retaining structure 311. Specifically, the dust retaining structure 311 is a belt-type dust retaining structure, that is, the dust retaining structure 311 is a belt structure. Specifically, the dust retaining structure 311 can use a tape structure, with a plastic sheet as the base, and adhesive is attached to the surface to form a sticky structure. It can also use a combination structure of an elastic sheet (plastic strip) and a cloth (pre-bonded), and a grease structure is applied to the cloth to form a sticky structure. The dust retaining structure 311 surrounds the annular dust retaining cavity 31, and the protective cover 3 is provided with two sets of extensions close to each other. Channel 37, both ends of the dust retaining structure 311 extend out of the protective cover 3 through two groups of extension channels 37 respectively, and a groove structure is provided on the inner wall of the annular dust retaining chamber 31, which is slidably engaged with the edge of the dust retaining structure 311, so that the dust retaining structure 311 can slide along the inner wall of the annular dust retaining chamber 31, and then during use, the dust retaining structure 311 can be pulled externally to make the dust retaining structure 311 move in the annular dust retaining chamber 31, and the part with dust particles adhered to it is gradually pulled out of the protective cover 3, and the new dust retaining structure 311 gradually enters the annular dust retaining chamber 31, thereby forming an effective replacement.

[0047] It should be noted that in order to improve the coverage rate of the dust retaining structure 311, the two groups of extension channels 37 need to be as close as possible. At the same time, a shielding structure can be set at the position of the extension channel 37 in the annular dust retaining cavity 31 to shield the two bending parts of the dust retaining structure 311. The shielding structure can be set to a triangular structure, so that the dust particles moving to the shielding structure can be guided to the dust retaining structure 311 on both sides. At the same time, the width of the extension channel 37 corresponding to the pulled-out part of the dust retaining structure 311 needs to be greater than the thickness of the dust retaining structure 311 to facilitate the removal of dust particles.

[0048] Furthermore, two groups of winding drums 312 are rotatably installed on the outer side of the annular dust retaining chamber 31, and the two ends of the dust retaining structure 311 are respectively connected to the two groups of winding drums 312 to form a winding. A shielding cover is provided on the outer side of the winding drum 312 to shield and protect the winding drum 312. A rotating driving structure, such as a knob, is provided on the winding drum 312, and the dust retaining structure 311 can be processed by manually rotating the winding drum 312, or a small motor structure can be set for automatic control, but the cost is relatively high.

[0049] At the same time, in order to ensure the stickiness of the dust retaining structure 311, refer to the attached manual. Figure 7The extension channel 37 is located above the protective cover 3. An oil storage chamber 371 is provided on the top of the extension channel 37. Grease is stored in the oil storage chamber 371. The dust retaining structure 311 passes through the grease in the oil storage chamber 371. Therefore, when the new dust retaining structure 311 enters the annular dust retaining chamber 31, the grease can be replenished in time to ensure viscosity. At the same time, the extension channel 37 can also be blocked with the help of grease (because the dust retaining structure 311 is moved regularly instead of being operated all the time, the loss of grease is relatively slow).

[0050] In the above embodiment, since a gap needs to be reserved between the auxiliary end cover 33 and the motor shaft 12, it is not appropriate to set a bearing or other structure (here it directly corresponds to the external environment, and the setting of a bearing or other structure will also directly contact the dust particles, so it will also be affected, and will increase the rotation wear of the motor shaft 12 and increase the transmission of the impeller vibration in the fan structure 4). In order to improve the support effect of the motor shaft 12, this embodiment also provides the following technical solutions, refer to the attached manual Figure 3 A reaction sleeve 36 is fixedly installed in the area of ​​the motor shaft 12 located on the inner side of the auxiliary end cover 33. A group of magnetic members 361 are respectively provided on the outer circumferential surface of the reaction sleeve 36 and the inner circumferential surface of the auxiliary end cover 33. The magnetic poles on one side corresponding to each other of the two groups of magnetic members 361 are the same, so that while ensuring that there is no contact with the motor shaft 12, the motor shaft 12 can also be auxiliary supported by magnetic force to reduce the swing of the motor shaft 12. At the same time, since the closer the two opposite magnetic poles are, the greater the repulsive force is, the motor shaft 12 can be formed to a certain buffering effect, thereby preventing the motor shaft 12 from directly driving the protective cover 3 to vibrate. On the contrary, under the repulsive force of the magnetic member 361, the vibration of the end of the motor shaft 12 that deviates from the rotation center can also be reduced, forming a certain vibration reduction effect.

[0051] For further information, please refer to the attached manual. Fig. 9 A plurality of grooves are arranged inside the auxiliary end cover 33, and a buffer slider 331 is slidably installed in each groove. Each group of magnetic members 361 in the auxiliary end cover 33 is fixedly installed on the corresponding buffer slider 331, and a buffer elastic member 332 (such as a rubber pad or a spring structure) is arranged between the buffer slider 331 and the groove of the auxiliary end cover 33, thereby increasing the buffering effect on the motor shaft 12.

[0052] For further information, please refer to the attached manual. Fig.11 In order to improve the overall protection effect of the variable speed motor 1, the present embodiment also provides the following technical solutions. Specifically, a protective shell 21 is fixedly installed on the motor mounting frame 2, and the protective shell 21 covers the outside of the variable speed motor 1. A vibration reduction structure 22 (such as a buffer structure such as a rubber vibration reduction pad) is provided between the variable speed motor 1 and the motor mounting frame 2 and between the variable speed motor 1 and the protective shell 21.

[0053] Refer to the instruction manual Fig.13 The present invention also provides a variable speed fan drive protection method, comprising the following steps:

[0054] Step 1: The dust particles that enter the protective cover 3 through the small gap between the auxiliary end cover 33 and the motor shaft 12 fall onto the shielding plate 32 and are blocked by the shielding plate 32;

[0055] Step 2: The dust particles are moved around by the centrifugal force through the rotation of the shielding plate 32, and fall on the dust retaining structure 311 in the annular dust retaining cavity 31, and are adhered by the sticky structure on the surface of the dust retaining structure 311;

[0056] Step 3: pull one end of the dust retaining structure 311 to make the dust retaining structure 311 slide along a circular trajectory in the annular dust retaining cavity 31 , and replace the new dust retaining structure 311 in the annular dust retaining cavity 31 .

[0057] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A variable speed fan drive protection device, comprising a variable speed motor (1), a motor mounting frame (2) and a protection cover (3), wherein the variable speed motor (1) comprises a motor housing (11) and a motor shaft (12), a shaft sealing assembly (13) is provided between the motor housing (11) and the motor shaft (12), and the motor housing (11) and the protection cover (3) are both fixedly mounted on the motor mounting frame (2), characterized in that: The protective cover (3) covers the outside of the output end of the motor shaft (12), and a side of the protective cover (3) corresponding to the motor housing (11) is engaged with an end of the motor housing (11); An annular dust cavity (31) is provided inside the protective cover (3); a shielding plate (32) is fixedly mounted on a region of the motor shaft (12) corresponding to the annular dust cavity (31); a baffle (35) is provided on a side of the shielding plate (32) corresponding to the motor housing (11); the baffle (35) is fixedly connected to the protective cover (3); an edge of the shielding plate (32) is located within a region covered by the annular dust cavity (31) along a length direction of the motor shaft (12); a dust retaining structure (311) is provided on an inner wall of the annular dust cavity (31); a sticky structure is provided on the surface of the dust retaining structure (311).

2. A variable speed fan drive protection device according to claim 1, characterized in that: A mounting sleeve is provided at the centre of the shielding disc (32), the mounting sleeve being fixedly sleeved on the motor shaft (12); the shielding disc (32) is a conical cover structure, and the edge of the shielding disc (32) is arranged away from the motor housing (11).

3. A variable speed fan drive protection device according to claim 2, characterized in that: An elastic ring sheet (321) is fixedly mounted on the edge of the shielding plate (32); the elastic ring sheet (321) is a thin sheet structure; the edge of the elastic ring sheet (321) is bent towards a side away from the motor housing (11); a plurality of groups of counterweight convex points (322) are arranged at the edge of the elastic ring sheet (321) on a side close to the motor housing (11); the plurality of groups of counterweight convex points (322) are evenly distributed along the circumferential direction of the elastic ring sheet (321).

4. A variable speed fan drive protection device according to claim 3, characterized in that: The dust retaining structure (311) is a belt-type dust retaining structure, the surface of which is coated with lubricating grease to form a viscous structure, the dust retaining structure (311) is arranged in a circle in the annular dust retaining cavity (31), and two groups of extension channels (37) are provided in the protective cover (3), the two ends of the dust retaining structure (311) respectively extend out of the protective cover (3) through the two groups of extension channels (37), and a slot structure is provided on the inner side wall of the dust retaining structure (311) that is slidably engaged with the edge of the dust retaining structure (311), and the dust retaining structure (311) slides along the inner wall of the annular dust retaining cavity (31).

5. A variable speed fan drive protection device according to claim 4, characterized in that: Two groups of winding drums (312) are rotatably mounted on the outer side of the annular dust retaining chamber (31), the two ends of the dust retaining structure (311) are respectively connected to the two groups of winding drums (312) to form a winding, a shielding cover is arranged on the outer side of the winding drum (312), and a rotation driving structure is arranged on the winding drum (312).

6. A variable speed fan drive protection device according to claim 5, characterized in that: The extension channel (37) is located above the protective cover (3), and an oil storage chamber (371) is provided at the top of the extension channel (37). Lubricating grease is stored in the oil storage chamber (371), and the dust retaining structure (311) passes through the lubricating grease in the oil storage chamber (371).

7. A variable speed fan drive protection device according to claim 6, characterized in that: An auxiliary end cover (33) is fixedly mounted on the middle of a side of the protective cover (3) away from the motor housing (11); the output end of the motor shaft (12) passes through the protective cover (3) and the auxiliary end cover (33); a reaction sleeve (36) is fixedly mounted on the area of ​​the motor shaft (12) located inside the auxiliary end cover (33); a group of magnetic members (361) are respectively provided on the outer circumferential surface of the reaction sleeve (36) and the inner circumferential surface of the auxiliary end cover (33); and the magnetic poles of one side of the two groups of magnetic members (361) corresponding to each other are the same.

8. A variable speed fan drive protection device according to claim 7, characterized in that: The auxiliary end cover (33) is provided with a plurality of groups of grooves inside, each groove having a buffer slider (331) slidably mounted therein, each group of magnetic members (361) in the auxiliary end cover (33) being fixedly mounted on a corresponding buffer slider (331), and a buffer elastic member (332) being provided between the buffer slider (331) and the groove of the auxiliary end cover (33).

9. A variable speed fan drive protection device according to claim 8, characterized in that: A closed structure (34) is provided between the protective cover (3) and the motor housing (11); the closed structure (34) is a rubber pad structure, and the closed structure (34) and the end shape of the variable speed motor (1) are mutually adapted; a protective housing (21) is fixedly mounted on the motor mounting frame (2); the protective housing (21) covers the outside of the variable speed motor (1); and a vibration reduction structure (22) is provided between the variable speed motor (1) and the motor mounting frame (2) and between the variable speed motor (1) and the protective housing (21).

10. A protection method for a variable speed fan drive protection device as claimed in claim 9, characterized in that: The following steps are involved: Step 1: dust particles that enter the protective cover (3) through the gap between the auxiliary end cover (33) and the motor shaft (12) fall onto the shielding plate (32) and are blocked by the shielding plate (32); Step 2: The shielding disk (32) rotates to cause the dust particles to move around under the influence of centrifugal force and fall onto the dust retaining structure (311) in the annular dust retaining cavity (31), and are adhered to the sticky structure on the surface of the dust retaining structure (311); Step three: pull one end of the dust retaining structure (311) so that the dust retaining structure (311) slides along a circular trajectory in the annular dust retaining cavity (31), and a new dust retaining structure (311) is inserted into the annular dust retaining cavity (31).

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