Variable speed driving device for air purifier fan with outer cover

Abstract

The invention discloses a variable-speed driving device with an outer cover for an air purifier fan, and particularly relates to the technical field of air purifiers, the variable-speed driving device comprises a variable-speed motor and a motor mounting assembly, the variable-speed motor comprises a motor shell and a rotor shaft, the motor mounting assembly comprises a fixing frame and an outer cover shell, and a buffer assembly is arranged between the outer cover shell and the motor shell; the rotor shaft comprises an outer shaft and an inner shaft, the inner shaft is slidably mounted in the outer shaft, and inner and outer shaft buffer structures are arranged between the two ends of the outer shaft and the inner shaft. By means of buffering between the outer shaft and the inner shaft through the inner and outer shaft buffering structure, the inner shaft and the outer shaft can generate micro relative movement, meanwhile, the movement can be buffered, impact on the inner shaft is buffered and counteracted through the inner and outer shaft buffering structure, and then it is guaranteed that the outer shaft cannot generate axial movement due to stress changes of the fan; and the relative stability of the motor shell in the outer cover shell is further ensured, and the noise is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air purifiers, and more specifically, to a variable speed drive device for an air purifier fan with an outer cover. Background Art

[0002] Air purifier, also known as "air cleaner", air refresher, purifier, refers to a household appliance that can absorb, decompose or transform various air pollutants (generally including PM2.5, dust, pollen, odor, decoration pollution such as formaldehyde, bacteria, allergens, etc.), and effectively improve the cleanliness of the air. It is mainly divided into household, commercial, industrial and building applications.

[0003] The core of the air purifier is the fan structure composed of a motor and a fan. With the help of the motor drive, an airflow is formed passing through the inside of the purifier. After the air is purified by the processing equipment inside the purifier, it is discharged again to achieve continuous purification of the air in the area.

[0004] Among them, in some large places, such as schools, hospitals, factory workshops, etc., a high-power motor is needed as a driving device to meet the large air volume demand. However, due to the large power of the motor, the motor speed is fast during use, the vibration generated by the motor is relatively large, and the noise generated is also relatively high. Therefore, for this type of air purifier, the motor structure used needs to have a stable and powerful installation structure that can provide good buffering to ensure that the motor can operate stably in the purifier and reduce operating noise.

[0005] As for some special environments, for example, some chemical workshops or offshore environments, there are some corrosive gases in the air, and the air is humid. If the motor is directly exposed and used, it is inevitable that corrosive gases and moisture in the air will fall near the motor. In severe cases, they may even enter the inside of the motor, causing damage to the rotor coil and other structures in the motor. Therefore, in order to provide good protection for the motor, in the prior art, a group of outer cover shells are arranged in the purifier to cover the outside of the motor. During installation, the motor is installed in the outer cover shell to provide good protection for the motor. Multiple groups of buffer support structures can also be arranged between the outer cover and the motor to effectively absorb and buffer the radial vibration formed when the motor rotates. At the same time, the influence of the motor vibration on the purifier body can be alleviated, reducing vibration damage and vibration noise.

[0006] However, some factories or other places of use need to use the purifier for a long time, and during use, the output speed of the motor is often adjusted to adjust the actual air output due to different usage requirements. When the purifier is in use, the airflow needs to be driven by the rotation of the fan. At this time, the radial vibration caused by the rotation of the fan can be fully absorbed by the vibration reduction structure in the outer cover shell (because the motor requires extremely high rotation accuracy, the motor shaft and the motor housing need to be accurately limited in the radial direction without any movable gap). However, when the fan drives the airflow, the reaction force of the air will also cause the fan to form an axial thrust on the motor shaft. In order to avoid the motor shaft from getting stuck due to thermal expansion and elongation, and to adapt to the bearing and installation, the motor shaft usually retains a certain error in the circumferential direction. , so that the motor shaft can retain a certain axial movement margin during actual operation. If the fan speed remains unchanged and the reaction force of the air remains unchanged, the motor shaft can also be relatively stable. However, in the above-mentioned usage conditions, the fan speed often changes, and the fan force changes, which can easily cause axial movement of the motor shaft, thereby enhancing the axial vibration of the motor. At this time, with the full support of the buffer structure in the outer cover shell, the axial vibration of the motor can be absorbed, but at the same time, the motor can also form a slight axial movement in the outer cover shell (operation during compression of the vibration reduction structure), thereby causing the air pressure in the outer cover shell to change (the motor is similar to a piston structure), which can easily inhale external air from the installation gap of the outer cover shell (such as the installation area between the outer cover shell and the motor shaft), reducing the protection effect on the motor. Summary of the invention

[0007] The present invention provides a variable speed drive device for an air purifier fan with an outer cover, and aims to solve the following problem: when the existing air purifier needs to frequently adjust the fan speed, the reaction force of the air will also cause the fan to form an axial thrust on the motor shaft, resulting in axial movement of the motor shaft, causing the motor to form a slight axial movement in the outer cover shell, which is easy to suck in external air from the installation gap of the outer cover shell, thereby reducing the protection effect on the motor.

[0008] To achieve the above-mentioned object, the present invention provides the following technical solutions: a variable speed drive device for a fan of an air purifier with an outer cover, comprising a variable speed motor and a motor mounting assembly, the variable speed motor comprising a motor housing and a rotor shaft, the motor mounting assembly comprising a fixing frame and an outer cover shell, the outer cover shell being fixedly mounted on the fixing frame, the variable speed motor being fixedly mounted in the outer cover shell, a buffer assembly being arranged between the outer cover shell and the motor housing, the rotor shaft comprising an outer shaft and an inner shaft, the inner shaft being slidably mounted in the outer shaft;

[0009] The upper and lower ends of the outer shaft both pass through the outer cover shell and rotate with the top and bottom ends of the outer cover shell. Inner and outer shaft buffer structures are arranged between the two ends of the outer shaft and the inner shaft. Convex step structures are arranged at the two ends of the outer shaft and at the positions of the inner shaft corresponding to the two ends of the outer shaft. The inner and outer shaft buffer structures are arranged between the two groups of convex step structures corresponding to the outer shaft and the inner shaft. The inner and outer shaft buffer structures are elastic structures. Shaft end sealing structures are arranged between the two ends of the outer shaft and the outer cover shell.

[0010] In a preferred embodiment, the top and bottom of the inner and outer shaft buffer structures are both fitted with the corresponding convex step structures to form a seal, and a storage groove is arranged on the inner side of the inner and outer shaft buffer structures in the area corresponding to the outer wall of the inner shaft, and lubricating oil is arranged in the storage groove and in the gap between the inner shaft and the outer shaft, and the cross-section of the storage groove is arranged to be a V-shaped cross-section.

[0011] In a preferred embodiment, the inner shaft is a hollow structure, an air flow channel is arranged in the middle of the inner shaft, the air flow channel runs downward through the inner shaft, an air outlet channel is arranged on the side wall at the top of the inner shaft, the air outlet channel is connected to the air flow channel, and an air flow acceleration structure is arranged inside the air flow channel.

[0012] In a preferred embodiment, the airflow acceleration structure is a plurality of fan blade structures, which are respectively fixedly mounted in a plurality of air outlet channels at the top of the inner shaft, and one end of the fan blade structure extends into the airflow channel.

[0013] In a preferred embodiment, the airflow acceleration structure is a spiral blade structure, which is fixedly installed in the airflow channel, and the inner shaft extends from the bottom end of the airflow channel and is provided with an expansion portion, and the spiral blade structure is a metal heat-conducting structure.

[0014] In a preferred embodiment, the shaft end sealing structure includes a movable end cover and a fixed end cover, the movable end cover is fixedly mounted on the outer shaft, the fixed end cover is fixedly mounted on the outer cover shell, the fixed end cover is rotationally fitted with the outer wall of the outer shaft, the movable end cover is rotationally engaged with the fixed end cover, an oil storage cavity is formed between the movable end cover and the fixed end cover in the area corresponding to the outer shaft, a reduced diameter section is provided in the area of ​​the outer shaft corresponding to the oil storage cavity, and the oil storage cavity is filled with sealing oil.

[0015] In a preferred embodiment, corresponding convex sleeves are arranged between the movable end cover and the fixed end cover, the two sets of convex sleeves are plugged into each other, and a sealing ring is arranged between the two sets of convex sleeves.

[0016] In a preferred embodiment, a surplus cavity is provided at the position of the moving end cover corresponding to the oil storage cavity, and a pressure equalizing membrane is fixedly installed in the surplus cavity. The pressure equalizing membrane is an elastic membrane structure, and a normal pressure air hole is provided on the side of the surplus cavity away from the pressure equalizing membrane, and the normal pressure air hole is connected to the outside air.

[0017] In a preferred embodiment, the buffer assembly includes a peripheral buffer pad and an axial buffer pad. The axial buffer pad is arranged in two groups. The two groups of axial buffer pads are respectively arranged at the top and bottom of the motor shell. The peripheral buffer pad is arranged around the motor shell. Multiple groups of ventilation pipes are arranged inside the peripheral buffer pad. The ventilation pipe is a hollow tube structure. The two ends of the ventilation pipe respectively pass through the top and bottom of the outer cover shell.

[0018] In a preferred embodiment, the variable speed motor is installed inside the air purifier through a fixing bracket, the fixing bracket is fixedly connected to the volute, the fixing bracket and the volute are fixedly installed together in the air purifier, a plurality of groups of reinforcing rib structures are arranged between the outer cover shell and the fixing bracket, the outer cover shell is installed at the air inlet of the volute, and an airflow guide cylinder is also fixedly connected to the volute, and the airflow guide cylinder extends to the air filtering and purification assembly.

[0019] The beneficial effects of the present invention are as follows: the present invention utilizes the inner and outer shaft buffer structures to provide buffering between the outer shaft and the inner shaft, so that the inner shaft can generate a slight relative movement with the outer shaft while also buffering the movement. Furthermore, during the use of the air purifier, even if the speed is frequently adjusted, causing the inner shaft to form a constantly changing axial impact, the inner and outer shaft buffer structures can be used to buffer and offset the impact of the inner shaft, thereby ensuring that the outer shaft will not generate axial movement due to changes in the fan force, further ensuring the relative stability of the motor housing in the outer cover shell, reducing the vibration intensity of the variable speed motor and reducing noise, and reducing the air pressure changes caused by the slight movement of the motor housing in the outer cover shell, allowing external air to enter the outer cover shell and even the motor housing, thereby improving the protection effect of the variable speed motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional diagram of the variable speed drive device of the present invention.

[0021] Figure 2 It is a schematic diagram of the overall structure of the variable speed drive device of the present invention.

[0022] Figure 3 The figure is a schematic diagram of installing the variable speed drive device of the present invention in an air purifier.

[0023] Figure 4 The figure is a schematic diagram of the installation of the variable speed motor of the present invention in the outer cover shell.

[0024] Figure 5 It is a bottom view of the internal structure of the outer cover shell of the present invention.

[0025] Figure 6 It is a schematic structural diagram of the sealing assembly of the present invention.

[0026] Figure 7 For the present invention Figure 6 A-section structure enlarged view.

[0027] Figure 8 This is a state diagram when the air pressure inside the outer cover shell of the present invention changes, causing the pressure of the sealing oil body to change, so that the pressure equalizing membrane body is deformed.

[0028] Fig. 9 It is a structural schematic diagram of one of the airflow acceleration structures of the present invention.

[0029] Fig.10 The present invention is based on Fig. 9 A top view of the distribution state of the airflow acceleration structure in the air outlet channel.

[0030] Fig.11 It is a structural schematic diagram of another airflow acceleration structure of the present invention.

[0031] The accompanying drawings are marked as follows: 1. variable speed motor; 11. motor housing; 12. rotor shaft; 121. outer shaft; 122. inner shaft; 123. air flow channel; 124. air outlet channel; 125. convex step structure; 126. reduced diameter section; 127. fan blade structure; 128. spiral blade structure; 2. motor mounting assembly; 21. fixing frame; 22. outer cover shell; 221. regulating air pipe; 23. volute; 24. air flow guide cylinder; 3. buffer assembly; 31. peripheral buffer pad; 32. axial buffer pad; 4. inner and outer shaft buffer structure; 41. storage slot; 5. shaft end sealing structure; 51. moving end cover; 52. fixed end cover; 53. oil storage chamber; 54. convex sleeve; 55. surplus chamber; 56. pressure equalizing membrane; 57. normal pressure air hole; 6. vent pipe; 7. air purifier; 71. air filtration and purification assembly. DETAILED DESCRIPTION

[0032] 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.

[0033] Refer to the instruction manual Figures 1 to 11A variable speed drive device for an air purifier fan with an outer cover includes a variable speed motor 1 and a motor mounting assembly 2. The variable speed motor 1 includes a stator and a rotor. The stator includes a motor housing 11. The inner wall of the motor housing 11 is provided with a corresponding stator magnet. The rotor includes a rotor shaft 12. The rotor shaft 12 is provided with a rotor coil. The motor mounting assembly 2 includes a fixing frame 21 and an outer cover shell 22. The outer cover shell 22 is fixedly mounted on the fixing frame 21. The variable speed motor 1 is fixedly mounted in the outer cover shell 22. A buffer assembly 3 is arranged between the outer cover shell 22 and the motor housing 11. The variable speed motor 1 is installed inside the air purifier 7 through the fixing frame 21. Specifically, the fixing frame 21 is fixedly connected to the volute 23. The fixing frame 21 and the volute 23 are connected together. It is fixedly installed in the air purifier 7, and a plurality of groups of reinforcing rib structures are arranged between the outer cover shell 22 and the fixing frame 21 to improve the stable support for the variable speed motor 1, and the motor housing 11 is fully buffered by means of the buffer component 3 to reduce the influence of the vibration of the variable speed motor 1 when it is running on the air purifier 7 itself, improve the stability of the equipment operation, and reduce the operating noise. At the same time, the existence of the outer cover shell 22 can wrap and cover the variable speed motor 1 in all directions, on the one hand, reduce the possibility of residual corrosive gas in the external air and moisture in the air contacting with the variable speed motor 1, and improve the protection effect of the variable speed motor 1, and on the other hand, the outer cover shell 22 can be made of sound insulation material to further reduce the propagation of internal noise of the variable speed motor 1.

[0034] Among them, in order to reduce the axial impact and vibration of the fan structure in the air flow guide tube 24 on the rotor shaft 12 caused by speed change when the air purifier 7 is running, the present embodiment provides the following technical solutions, the rotor shaft 12 includes an outer shaft 121 and an inner shaft 122, the rotor coil is installed on the outer shaft 121, and the inner shaft 122 is slidably installed in the outer shaft 121, wherein a sliding guide structure, such as a sliding member, is arranged between the inner shaft 122 and the outer shaft 121, to limit the axial movement between the outer shaft 121 and the inner shaft 122, so that the two can only produce axial relative movement, and the upper and lower ends of the outer shaft 121 both pass through the outer cover shell 22, and are rotatably matched with the top and bottom ends of the outer cover shell 22, and inner and outer shaft buffer structures 4 are arranged between the two ends of the outer shaft 121 and the inner shaft 122, specifically, convex step structures 125 are arranged at the two ends of the outer shaft 121 and the positions of the inner shaft 122 corresponding to the two ends of the outer shaft 121, and the inner and outer shaft buffer structures 4 are arranged between the outer shaft 121 and the inner shaft 122. 2, the inner and outer shaft buffer structure 4 is an elastic structure (such as rubber). With the help of the inner and outer shaft buffer structure 4, the outer shaft 121 and the inner shaft 122 are buffered, so that the inner shaft 122 can produce a slight relative movement with the outer shaft 121, and the movement can also be buffered. Therefore, during the use of the air purifier 7, even if the speed is frequently adjusted, resulting in a constantly changing axial impact on the inner shaft 122, the impact of the inner shaft 122 can be buffered and offset with the help of the inner and outer shaft buffer structure 4, thereby ensuring that the outer shaft 121 will not produce axial movement due to the change in the fan force, further ensuring the relative stability of the motor housing 11 in the outer cover shell 22, on the one hand, reducing the vibration intensity of the variable speed motor 1 and reducing noise, and on the other hand, it can reduce the pressure change caused by the slight movement of the motor housing 11 in the outer cover shell 22, so that the external air enters the outer cover shell 22 and even enters the motor housing 11, thereby improving the protection effect of the variable speed motor 1.

[0035] It should be noted that in conventional air purifiers 7, the motor structure is usually installed on the back side of the volute 23, that is, the end away from the air inlet of the volute 23 (for example, the side of the motor 23). Figure 3 The motor itself deviates from the airflow path when the device is running. In order to improve the heat dissipation effect of the variable speed motor 1, in this embodiment, the outer cover shell 22 is installed at the air inlet of the volute 23, that is, the appendix of the manual Figure 3At the bottom position of the volute 23 shown, the inner shaft 122 is fixedly connected to the fan in the volute 23, and an airflow guide cylinder 24 is also fixedly connected to the volute 23, and the airflow guide cylinder 24 extends to the air filter and purification component 71. The air treated by the air filter and purification component 71 is guided by the airflow guide cylinder 24 (the air filter and purification component 71 is an important component of the air purifier 7, and its scheme is all prior art, which will not be explained in detail in this embodiment), and enters the volute 23 after flowing through the outer cover shell 22, and flows out from the air outlet of the volute 23 under the action of the fan, and multiple groups of heat sinks are arranged on the outside of the outer cover shell 22, so that when the equipment is used for a long time, the airflow formed by the air purifier 7 itself can be used to effectively dissipate the heat of the variable speed motor 1.

[0036] In the above embodiment, since the variable speed motor 1 generates heat when it is running, in order to ensure the rotation concentricity of the rotor shaft 12, the radial matching accuracy of the outer shaft 121 and the inner shaft 122 (that is, the tightness of the circumferential sides of the two) is relatively high. Although in actual use, the gap between the motor housing 11 and the outer cover shell 22 can be set to be relatively small to ensure the normal heat dissipation of the variable speed motor 1, the above heat dissipation starts from the motor housing 11, and the heat at the center of the rotor shaft 12 is dissipated slowly. Therefore, if the equipment is used for a long time, the rotor shaft 12 itself accumulates too much heat and causes a high temperature, resulting in different degrees of expansion, which is easy to increase the tightness between the inner shaft 122 and the outer shaft 121, and even directly cause jamming. The inner shaft 122 cannot generate relative axial movement with the outer shaft 121, and it is also impossible to directly buffer the axial impact. For this reason, the present embodiment also provides the following technical solutions. For details, refer to the attached manual. Figure 4 The inner shaft 122 is a hollow structure, and an air flow channel 123 is arranged in the middle of the inner shaft 122, and the air flow channel 123 penetrates the inner shaft 122 downwardly, and an air outlet channel 124 is arranged on the side wall at the top of the inner shaft 122, and the air outlet channel 124 is communicated with the air flow channel 123. In actual use, since the rotor shaft 12 in this embodiment is arranged vertically, when the rotor shaft 12 itself generates heat during the use of the equipment, the air temperature in the air flow channel 123 will increase, and the hot air will flow upward and be discharged from the air outlet channel 124 to form air convection, so as to directly dissipate the heat of the rotor shaft 12, thereby improving the heat dissipation effect of the variable speed motor 1, and ensuring that the inner shaft 122 will not excessively expand thermally to affect the matching effect with the outer shaft 121, thereby improving the stability of the equipment operation.

[0037] Furthermore, in order to improve the air flow effect inside the inner shaft 122, the present embodiment further provides the following solution. Specifically, an airflow acceleration structure is provided inside the airflow channel 123. Fig. 9 and Fig.10The airflow acceleration structure can be a plurality of sets of fan blade structures 127, which are respectively fixedly installed in a plurality of air outlet channels 124 at the top of the inner shaft 122 to form an impeller structure, and one end of the fan blade structure 127 extends into the airflow channel 123. When the inner shaft 122 rotates, the fan blade structure 127 can push the air inside the airflow channel 123, and the centrifugal effect at the air outlet channel 124 when the inner shaft 122 rotates at a high speed can accelerate the discharge of the air inside the airflow channel 123 and accelerate the air flow effect inside the inner shaft 122.

[0038] In addition, refer to the instructions attached Fig.11 The airflow acceleration structure can also be a spiral blade structure 128. Specifically, the spiral blade structure 128 is fixedly installed in the airflow channel 123, and the inner shaft 122 is extended from the bottom end of the airflow channel 123, and an expansion portion is provided (the diameter of the spiral blade is larger than the diameter of the spiral blade inside the airflow channel 123, forming a flat multi-layer structure). The spiral blade structure 128 is a metal structure, and in actual use, the spiral blade structure 128 can also be like an auger structure to promote the flow of air inside the airflow channel 123. At the same time, the spiral blade structure 128 itself can also be used as a heat dissipation structure to improve the heat dissipation effect of the inner shaft 122, especially the expansion portion extending out of the airflow channel 123, which can further improve the heat dissipation to the surrounding area and ensure the heat dissipation effect.

[0039] In addition, in order to ensure the coaxial matching accuracy of the inner shaft 122 and the outer shaft 121, ensure the sliding effect between the two, and reduce the friction loss between the two, this embodiment also provides the following technical solutions. Figure 6The top and bottom of the inner and outer shaft buffer structures 4 are both fitted with the corresponding convex step structures 125 to form a seal (a snap-fit ​​structure or a bonding structure can also be set to ensure the stability and sealing of the installation between the inner and outer shaft buffer structures 4 and the convex step structures 125). A storage groove 41 is set in the area of ​​the inner side of the inner and outer shaft buffer structures 4 corresponding to the outer wall of the inner shaft 122. Lubricating oil is set in the storage groove 41 and in the matching tolerance gap between the inner shaft 122 and the outer shaft 121, and the cross-section of the storage groove 41 is set to a V-shaped cross-section. Specifically, due to the presence of lubricating oil between the inner shaft 122 and the outer shaft 121, vibration wear can be effectively reduced, and the friction between the two can also be reduced. Friction resistance effectively prevents the inner shaft 122 from driving the outer shaft 121 to move. At the same time, due to the relative movement between the inner shaft 122 and the outer shaft 121, the corresponding inner and outer shaft buffer structures 4 will be squeezed or stretched. For example, when the inner shaft 122 vibrates downward, the upper inner and outer shaft buffer structure 4 is compressed, and the lower inner and outer shaft buffer structure 4 is stretched (or pre-tightened and expands when the pressure decreases). The lubricating oil in the upper storage groove 41 has a downward squeezing effect, thereby ensuring that the lubricating oil as a whole does not flow out, and at the same time, it can also promote the lubricating oil to produce a certain flow in the matching tolerance gap between the inner shaft 122 and the outer shaft 121, further improving the lubrication effect.

[0040] In the above embodiment, due to the buffering of the inner and outer shaft buffer structures 4, the axial vibration of the motor housing 11 in the outer cover shell 22 can be effectively reduced, and the relative stability of the internal air pressure of the outer cover shell 22 can be ensured as much as possible, which can also reduce the exchange of air inside and outside the outer cover shell 22 caused by air flow due to air pressure changes. However, the rotational fit between the outer shaft 121 and the outer cover shell 22 forms a fitting gap. When the temperature inside the outer cover shell 22 changes greatly, the air expansion or contraction generated may also form air exchange here. In order to solve this problem, the present embodiment also provides the following technical solutions. For details, refer to the attached manual. Figure 4 , Figure 6 and Figure 7A shaft end sealing structure 5 is provided between both ends of the outer shaft 121 and the outer cover shell 22. The shaft end sealing structure 5 includes a movable end cover 51 and a fixed end cover 52. The movable end cover 51 is fixedly mounted on the outer shaft 121 (and also forms a convex step structure 125 on the outer shaft 121). The fixed end cover 52 is fixedly mounted on the outer cover shell 22. The fixed end cover 52 is rotationally fitted with the outer wall of the outer shaft 121. The movable end cover 51 is rotationally engaged with the fixed end cover 52. An oil storage cavity is formed between the movable end cover 51 and the fixed end cover 52 at the area corresponding to the outer shaft 121. 53, a reduced diameter section 126 is provided in the area of ​​the outer shaft 121 corresponding to the oil storage chamber 53, and with the help of the gap between the reduced diameter section 126 and the fixed end cover 52, a gradually extending area is formed from the oil storage chamber 53 to the fixed end cover 52 and the outer shaft 121 fitting area, and the oil storage chamber 53 is filled with a sealing oil body lubricating oil or grease, which can form a certain lubrication while sealing, that is, with the help of the existence of the sealing oil body, the matching position of the outer shaft 121 and the outer cover shell 22 is sealed, thereby making it difficult for external air to enter the outer cover shell 22.

[0041] Furthermore, corresponding convex sleeves 54 are provided between the movable end cover 51 and the fixed end cover 52 , the two sets of convex sleeves 54 are plugged into each other, and a sealing ring is provided between the two sets of convex sleeves 54 , thereby ensuring that the sealed oil body in the oil storage cavity 53 area is not easy to leak.

[0042] For further information, please refer to the attached manual. Figure 7 and Figure 8 A residual chamber 55 is provided at the position of the movable end cover 51 corresponding to the oil storage chamber 53, and a pressure equalizing membrane 56 is fixedly installed in the residual chamber 55. The pressure equalizing membrane 56 is an elastic membrane structure. A normal pressure air hole 57 is provided on the side of the residual chamber 55 away from the pressure equalizing membrane 56, and the normal pressure air hole 57 is connected to the outside air.

[0043] It should be noted that, due to the presence of air inside the outer cover shell 22, under the action of the air pressure, the sealing oil in the residual chamber 55 is not easy to enter the outer cover shell 22 through the matching surface of the fixed end cover 52 and the outer shaft 121. At the same time, the air in the outer cover shell 22 is not easy to be discharged outward. When the air inside the outer cover shell 22 produces a pressure difference due to temperature changes, the pressure can act on the sealing oil in the oil storage chamber 53 through the matching gap between the fitting surfaces of the fixed end cover 52 and the outer shaft 121, and the sealing oil acts on the pressure equalizing membrane 56 with the pressure difference, causing it to bulge outward or inward, thereby adapting to the pressure difference in the outer cover shell 22. At the same time, it also ensures that the sealing oil will not be squeezed out from the gap between the convex sleeves 54 due to the increase in air pressure, thereby improving the sealing effect on the end of the inner shaft 122.

[0044] In addition, an adjusting air pipe 221 is also provided on the outer cover shell 22, and the adjusting air pipe 221 includes an air inlet pipe and an air outlet pipe, and control valves are provided on the air inlet pipe and the air outlet pipe. Therefore, when the equipment is actually assembled, safe air can be input into the outer cover shell 22 through the air inlet pipe and the air outlet pipe, and when necessary, the internal air pressure of the outer cover shell 22 can be adjusted by adjusting the amount of air intake and air outlet. However, this solution requires the cooperation of an air pump structure, and the cost is relatively high.

[0045] Furthermore, the buffer assembly 3 includes a peripheral buffer pad 31 and an axial buffer pad 32. The axial buffer pad 32 is provided in two groups. The two groups of axial buffer pads 32 are respectively provided at the top and the bottom of the motor housing 11, and are used to buffer the axial vibration of the variable speed motor 1 itself. The peripheral buffer pad 31 is provided around the motor housing 11 to provide effective positioning and radial buffering for the motor housing 11. The peripheral buffer pad 31 and the axial buffer pad 32 are preferably rubber pad structures. If necessary, a mutually engaging structure can be provided between the peripheral buffer pad 31 and the motor housing 11 to ensure stable support for the motor housing 11.

[0046] In order to further improve the heat dissipation effect of the variable speed motor 1, refer to the attached Figure 4 A plurality of ventilation pipes 6 are arranged inside the peripheral buffer pad 31. The ventilation pipes 6 are hollow tube structures. The two ends of the ventilation pipes 6 respectively penetrate the top and bottom of the outer cover shell 22. In actual use, in conjunction with the design position of the variable speed motor 1, the airflow formed by the air purifier 7 can be used to make a part of the airflow penetrate the ventilation pipes 6 to directly dissipate the heat of the peripheral buffer pad 31, thereby improving the heat dissipation effect of the variable speed motor 1. At the same time, the ventilation pipes 6 can also serve as a reinforcement structure for the peripheral buffer pad 31 to improve the stability of the peripheral buffer pad 31, and the ventilation pipes 6 can directly dissipate the heat of the peripheral buffer pad 31 effectively to prevent the peripheral buffer pad 31 from being overheated and expanding too much, thereby increasing the pressure on the motor shell 11 and affecting the buffering effect.

[0047] 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 drive device for an air purifier fan with an outer cover, comprising a variable speed motor (1) and a motor mounting assembly (2), wherein the variable speed motor (1) comprises a motor housing (11) and a rotor shaft (12), wherein the motor mounting assembly (2) comprises a fixing frame (21) and an outer cover shell (22), wherein the outer cover shell (22) is fixedly mounted on the fixing frame (21), wherein the variable speed motor (1) is fixedly mounted in the outer cover shell (22), and a buffer assembly (3) is provided between the outer cover shell (22) and the motor housing (11), wherein: The rotor shaft (12) comprises an outer shaft (121) and an inner shaft (122), wherein the inner shaft (122) is slidably mounted in the outer shaft (121); The upper and lower ends of the outer shaft (121) both pass through the outer cover shell (22) and are rotatably matched with the top and bottom ends of the outer cover shell (22); inner and outer shaft buffer structures (4) are provided between the two ends of the outer shaft (121) and the inner shaft (122); convex step structures (125) are provided at the two ends of the outer shaft (121) and at positions of the inner shaft (122) corresponding to the two ends of the outer shaft (121); the inner and outer shaft buffer structure (4) is provided between two groups of convex step structures (125) corresponding to the outer shaft (121) and the inner shaft (122); the inner and outer shaft buffer structure (4) is an elastic structure; and shaft end sealing structures (5) are provided between the two ends of the outer shaft (121) and the outer cover shell (22).

2. The variable speed drive device for a fan of an air purifier with an outer cover according to claim 1, characterized in that: The top and bottom of the inner and outer shaft buffer structure (4) are both in contact with the corresponding convex step structure (125) to form a seal, and a storage groove (41) is provided in an area on the inner side of the inner and outer shaft buffer structure (4) corresponding to the outer wall of the inner shaft (122), and lubricating oil is provided in the storage groove (41) and in the gap between the inner shaft (122) and the outer shaft (121), and the cross section of the storage groove (41) is set to be a V-shaped cross section.

3. The variable speed drive device for a fan of an air purifier with an outer cover according to claim 2, characterized in that: The inner shaft (122) is a hollow structure, an airflow channel (123) is provided in the middle of the inner shaft (122), the airflow channel (123) penetrates downwardly through the inner shaft (122), an air outlet channel (124) is provided on the side wall at the top of the inner shaft (122), the air outlet channel (124) is communicated with the airflow channel (123), and an airflow acceleration structure is provided inside the airflow channel (123).

4. The variable speed drive device for a fan of an air purifier with an outer cover according to claim 3, characterized in that: The airflow acceleration structure is a plurality of groups of fan blade structures (127), and the plurality of groups of fan blade structures (127) are respectively fixedly mounted in a plurality of air outlet channels (124) at the top of the inner shaft (122), and one end of the fan blade structure (127) extends into the airflow channel (123).

5. The variable speed drive device for a fan of an air purifier with an outer cover according to claim 3, characterized in that: The airflow acceleration structure is a spiral blade structure (128), the spiral blade structure (128) is fixedly installed in the airflow channel (123), and the inner shaft (122) extends from the bottom end of the airflow channel (123) and is provided with an expansion portion, and the spiral blade structure (128) is a metal heat-conducting structure.

6. A variable speed drive device for a fan of an air purifier with an outer cover according to claim 4 or 5, characterized in that: The shaft end sealing structure (5) comprises a movable end cover (51) and a fixed end cover (52); the movable end cover (51) is fixedly mounted on the outer shaft (121); the fixed end cover (52) is fixedly mounted on the outer housing shell (22); the fixed end cover (52) is rotationally fitted with the outer wall of the outer shaft (121); the movable end cover (51) and the fixed end cover (52) are rotationally engaged; an oil storage cavity (53) is formed at a region corresponding to the outer shaft (121) between the movable end cover (51) and the fixed end cover (52); a reduced diameter section (126) is provided at a region of the outer shaft (121) corresponding to the oil storage cavity (53); and the oil storage cavity (53) is filled with sealing oil.

7. A variable speed drive device for a fan of an air purifier with an outer cover according to claim 6, characterized in that: Mutually corresponding convex sleeves (54) are provided between the movable end cover (51) and the fixed end cover (52); two groups of the convex sleeves (54) are plugged into each other, and a sealing ring is provided between the two groups of the convex sleeves (54).

8. The variable speed drive device for a fan of an air purifier with an outer cover according to claim 7, characterized in that: A surplus cavity (55) is arranged at a position of the movable end cover (51) corresponding to the oil storage cavity (53), a pressure equalizing membrane (56) is fixedly installed in the surplus cavity (55), the pressure equalizing membrane (56) is an elastic membrane structure, and a normal pressure pore (57) is arranged on a side of the surplus cavity (55) away from the pressure equalizing membrane (56), and the normal pressure pore (57) is connected to the outside air.

9. The variable speed drive device for a fan of an air purifier with an outer cover according to claim 8, characterized in that: The buffer assembly (3) comprises a peripheral buffer pad (31) and an axial buffer pad (32), wherein the axial buffer pad (32) is provided in two groups, and the two groups of axial buffer pads (32) are respectively provided at the top and the bottom of the motor housing (11), and the peripheral buffer pad (31) is provided around the motor housing (11), and a plurality of groups of ventilation pipes (6) are provided inside the peripheral buffer pad (31), wherein the ventilation pipe (6) is a hollow pipe structure, and the two ends of the ventilation pipe (6) respectively penetrate the top and the bottom of the outer cover shell (22).

10. The variable speed drive device for a fan of an air purifier with an outer cover according to claim 9, characterized in that: The variable speed motor (1) is installed inside the air purifier (7) via a fixing frame (21); the fixing frame (21) is fixedly connected to the volute (23); the fixing frame (21) and the volute (23) are fixedly installed together in the air purifier (7); a plurality of groups of reinforcing rib structures are arranged between the outer cover shell (22) and the fixing frame (21); the outer cover shell (22) is installed at the air inlet of the volute (23); an airflow guide cylinder (24) is also fixedly connected to the volute (23); the airflow guide cylinder (24) extends to the air filter purification component (71).

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