Oil smoke purification device

Abstract

The invention relates to cooking fume treatment equipment, in particular to a cooking fume purification device which comprises a fume collecting pipeline, an impeller, a driving mechanism and a radial magnetic suspension bearing, and a fume exhaust channel communicated with the outside is formed in the fume collecting pipeline; the impeller is positioned in the smoke exhaust channel; the driving mechanism comprises a rotating shaft and a magnetic bearing motor, the rotating shaft is connected with the impeller, and the bearing motor is arranged in the smoke collecting pipeline and arranged on the peripheral side of the rotating shaft in a sleeving mode to drive the rotating shaft to rotate along the axis of the rotating shaft. The radial magnetic suspension bearing is arranged in the smoke collecting pipeline and arranged on the peripheral side of the rotating shaft in a sleeving mode, the radial magnetic suspension bearing can support the rotating shaft to be located at the axis position of the bearing motor through magnetic force, and compared with a traditional induction motor, the problem of noise generated by friction is avoided to a certain degree; and the friction loss is avoided, so that the efficiency of the motor is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to an oil fume treatment device, in particular to an oil fume purification device. BACKGROUND

[0002] In large hotels, canteens and catering places, oil fume purification devices are usually used to treat a large amount of oil fume generated during cooking to avoid air pollution caused by direct discharge of oil fume into the atmosphere. The current oil fume purification device uses an induction motor to drive the impeller to form a fan system to achieve the suction, filtration and discharge of oil fume.

[0003] However, the traditional induction motor not only has low efficiency, but also has high noise during use. In addition, as the use time of the oil fume purification device increases, the impeller will be deflected together with the shaft due to the oil stains attached to the surface, which will further exacerbate the noise problem of the fan and affect the service life. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the defects of the prior art oil fume purification device caused by the motor, such as noise and affecting the service life, and to provide an oil fume purification device.

[0005] The present application solves the above technical problems by the following technical solutions:

[0006] The present application provides an oil fume purification device, characterized in that it comprises a smoke collecting pipeline, an impeller, a driving mechanism and a radial magnetic suspension bearing, wherein the smoke collecting pipeline forms a smoke discharge channel communicating with the outside; the impeller is located in the smoke discharge channel; the driving mechanism comprises a shaft and a magnetic bearing motor, the shaft is connected with the impeller, the bearing motor is arranged in the smoke collecting pipeline and is sleeved on the outer peripheral side of the shaft to drive the shaft to rotate along its axis; the radial magnetic suspension bearing is arranged in the smoke collecting pipeline and is sleeved on the outer peripheral side of the shaft, and the radial magnetic suspension bearing can support the shaft at the axis position of the bearing motor by magnetic force.

[0007] The oil fume purification device provided by the embodiment of the present application is provided with a smoke collecting pipeline, an impeller, a driving mechanism and a radial magnetic suspension bearing, wherein the driving mechanism comprises a rotating shaft and a magnetic bearing motor, the rotating shaft is connected with the impeller to drive the impeller to rotate, and the magnetic bearing motor is further arranged on the outer circumferential side of the rotating shaft to drive the rotating shaft to rotate along the axis thereof. In this way, the magnetic bearing motor can drive the motor rotor and the rotating shaft to rotate through the rotating magnetic field generated by the motor stator on the motor rotor, and since the motor rotor and the motor stator are arranged separately, the gap between them prevents the motor rotor and the rotating shaft from contacting the motor stator during rotation, so that the magnetic bearing motor does not generate friction loss during rotation of the rotating shaft and does not generate noise due to internal friction. On this basis, the radial magnetic suspension bearing can support the rotating shaft to keep the motor rotor arranged on the rotating shaft at the position in the center of the motor stator, and since the radial magnetic suspension bearing also supports the rotating shaft at the axial position of the bearing motor through magnetic force, the radial magnetic suspension bearing also does not generate internal friction loss and friction noise during rotation of the rotating shaft. Therefore, compared with the traditional induction motor, the oil fume purification device of the embodiment of the present application not only avoids the noise problem caused by friction to a certain extent, but also further improves the motor efficiency by avoiding friction loss.

[0008] Preferably, the radial magnetic suspension bearing comprises a radial rotor and a radial stator, the radial rotor is sleeved on the rotating shaft, the radial stator is located on the radial outer side of the radial rotor, and the radial stator comprises a first coil winding arranged along the circumferential direction thereof; the oil fume purification device further comprises a radial sensor and a control system, the radial sensor is arranged corresponding to the rotating shaft to obtain the radial displacement of the rotating shaft and generate a radial displacement signal, and the control system is electrically connected with the radial sensor and the first coil winding to adjust the current size of the first coil winding according to the radial displacement signal, so that the electromagnetic force at any position between the radial stator and the radial rotor in the circumferential direction is changed.

[0009] In this way, the radial sensor can realize real-time monitoring of the position of the rotating shaft in the radial direction and can transmit all the obtained data signals to the control system, and the control system can specifically change the current in the winding on the radial side where the rotating shaft deviates, i.e., change the electromagnetic force of the electromagnets on the two radial sides, so that the radial rotor is moved back to the balanced position through adjustment of the acting force.

[0010] Preferably, the number of radial magnetic suspension bearings is two, and the two radial magnetic suspension bearings are arranged on the opposite sides of the bearing motor along the axial direction of the rotating shaft; and one radial sensor is arranged at the position of the rotating shaft close to each radial magnetic suspension bearing.

[0011] Thus, the displacement monitoring of the rotating shaft at two positions along the axial direction can be realized. Moreover, the radial sensor is arranged close to the radial magnetic suspension bearing, so that the distance between the two can be smaller, and the difference between the displacement degree detected by the sensor and the displacement degree of the position where the radial rotor and the radial stator are located can be smaller, so that the accuracy of signal acquisition and current control is improved, and the adjustment is more accurate.

[0012] Preferably, two radial sensors are arranged at the position of the rotating shaft close to each radial magnetic suspension bearing, and the two radial sensors are arranged on the same circumferential direction of the rotating shaft and are located at two radial positions perpendicular to each other.

[0013] Thus, the displacement monitoring of the rotating shaft at two positions along the axial direction can be realized. Moreover, the radial sensor is arranged close to the radial magnetic suspension bearing, so that the distance between the two can be smaller, and the difference between the displacement degree detected by the sensor and the displacement degree of the position where the radial rotor and the radial stator are located can be smaller, so that the accuracy of signal acquisition and current control is improved, and the adjustment is more accurate.

[0014] Preferably, the oil fume purification device comprises a bearing shell, the magnetic bearing motor and the radial magnetic suspension bearing are arranged inside the bearing shell, and the rotating shaft is arranged on the bearing shell; the oil fume purification device further comprises a support assembly, and the bearing shell is connected to the smoke collecting pipeline through the support assembly. Thus, the magnetic suspension bearing motor system can be conveniently installed in the smoke collecting pipeline.

[0015] Preferably, the support assembly comprises a first support plate and a support bracket, one end of the support bracket is connected to the first support plate, and the other end of the support bracket is connected to the pipe wall of the smoke collecting pipeline; one end of the bearing shell is provided with a mounting portion, the rotating shaft can pass out of the mounting portion, a first mounting opening is formed in the first support plate, and the mounting portion can pass through the first mounting opening, so that the bearing shell is connected to the support assembly; the impeller is located on the other side of the first support plate relative to the bearing shell, and the end of the rotating shaft can pass through the mounting portion and the first mounting opening and is connected to the impeller.

[0016] Preferably, the support assembly further comprises a second support plate, the second support plate is connected to the pipe wall of the smoke collecting pipeline along the circumferential direction of the smoke collecting pipeline, and the other end of the support bracket is connected to the second support plate; the impeller is arranged between the first support plate and the second support plate.

[0017] By arranging the second support plate, the support bracket can be conveniently connected and fixed to the pipe wall of the smoke collecting pipeline, and meanwhile, the placement of the impeller is not affected.

[0018] Preferably, the impeller is a centrifugal impeller, one axial end of the impeller is connected with the rotating shaft, and the other axial end of the impeller is provided with an air inlet; the second support plate is provided with a smoke gathering opening corresponding to the air inlet, and the smoke gathering opening is provided with an annular smoke gathering plate, one end of the annular smoke gathering plate is smoothly connected with the opening edge of the smoke gathering opening, the other end of the annular smoke gathering plate extends towards the position of the air inlet, and the outer contour size of the smoke gathering plate is gradually reduced in the direction from the smoke gathering opening to the air inlet.

[0019] The design of the smoke gathering opening matched with the annular smoke gathering plate can gather the airflow and oil fume in the smoke collecting pipeline towards the air inlet of the impeller, so that the impeller can achieve better air suction effect.

[0020] Preferably, the smoke collecting pipeline comprises a first pipeline segment and a second pipeline segment coaxially arranged and connected; the end of the first pipeline segment is provided with a first flange, the end of the second pipeline segment is provided with a second flange, and the first pipeline segment and the second pipeline segment are connected through the first flange and the second flange; and the circumferential side edge of the first support plate is clamped between the first flange and the second flange.

[0021] In this way, the first support plate can be conveniently connected and fixed, and at the same time, the longer smoke collecting pipeline can be divided into two parts for production and manufacturing, thereby reducing the production cost of the structure and facilitating the installation of other internal components in the smoke collecting pipeline.

[0022] Preferably, the smoke collecting pipeline is formed with a smoke discharging opening communicated with the smoke discharging passage; the oil fume purification device further comprises a rain cover, the rain cover covers the smoke discharging opening, and a plurality of air outlet holes are formed in the rain cover; and the rotating shaft is in transmission connection with the rain cover, so that the rain cover is rotatable relative to the smoke collecting pipeline.

[0023] The rain cover can prevent external rainwater from flowing into the smoke collecting pipeline and affecting the normal operation of the internal components, and the rain cover is in transmission connection with the rotating shaft, so that the rain cover can be driven to rotate while the rotating shaft drives the impeller to rotate, so that the rainwater on the rain cover is thrown out by centrifugal force, thereby further achieving the effects of rain and water prevention.

[0024] Preferably, the air outlet holes are strip-shaped holes, all the air outlet holes are arranged in a spiral manner on the rain cover, and / or the extension direction of the air outlet holes is inclined relative to the axial direction of the rotating shaft.

[0025] In this way, the oil fume in the smoke collecting pipeline can be discharged more effectively and quickly, and at the same time, external rainwater can be further prevented from flowing into the smoke collecting pipeline through the air outlet holes.

[0026] Preferably, the oil fume purification device further comprises a transmission mechanism, the rotating shaft and the rain cover are in transmission connection through the transmission mechanism; the transmission mechanism comprises a transmission shaft, and a driving wheel and a driven wheel in mutual engagement, the transmission shaft is arranged on the rain cover and extends along the rotating shaft of the rain cover, the driven wheel is sleeved on the transmission shaft, and the driving wheel is sleeved on the rotating shaft; the number of teeth of the driven wheel is greater than that of the driving wheel.

[0027] Since the rotating speed of the rotating shaft is relatively high when driving the impeller to rotate, and the rain cover does not need a relatively high rotating speed, through the above arrangement, the driving wheel and the driven wheel in mutual engagement can realize the rotating speed adjustment of the rain cover. Specifically, since the number of teeth of the driven wheel is greater than that of the driving wheel, that is, the rotating speed of the driven wheel is lower than that of the driving wheel, since the driven wheel is sleeved on the transmission shaft connected with the rain cover, the rotating speed of the rain cover can be reduced synchronously, and this structure is simple and reliable and convenient to install.

[0028] On the basis of common knowledge in the art, the above preferred conditions can be combined arbitrarily, that is, the preferred embodiments of the present application are obtained. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The structure schematic view of the oil fume purification device provided by the embodiments of the present application.

[0030] Figure 2 The structure explosion view of the oil fume purification device provided by the embodiments of the present application.

[0031] Figure 3 The internal structure schematic view of the oil fume purification device provided by the embodiments of the present application.

[0032] Figure 4 The internal structure schematic view of the impeller and the magnetic suspension bearing motor system of the oil fume purification device provided by the embodiments of the present application.

[0033] Figure 5 The structure schematic view of the support assembly of the oil fume purification device provided by the embodiments of the present application.

[0034] Figure 6 The structure schematic view of the transmission mechanism of the oil fume purification device provided by the embodiments of the present application.

[0035] BRIEF DESCRIPTION OF DRAWINGS

[0036] 1, smoke collecting pipeline; 11, smoke exhaust passage; 12, first pipeline section; 13, second pipeline section; 14, side air inlet pipe; 15, smoke exhaust port;

[0037] 2, impeller; 21, air inlet;

[0038] 3. A magnetic bearing motor system; 31. A driving mechanism; 311. A rotating shaft; 312. A magnetic bearing motor; 32. A radial magnetic bearing; 33. A radial sensor; 34. A radial protection bearing; 35. An axial magnetic bearing; 36. An axial sensor; 37. A bearing housing; 371. A mounting portion;

[0039] 4. A support assembly; 41. A first support plate; 42. A support bracket; 43. A second support plate; 44. A smoke collecting opening;

[0040] 5. A ring-shaped smoke collecting plate;

[0041] 6. A filter;

[0042] 7. A rain cover; 71. An air outlet hole;

[0043] 8. An outer ring bearing;

[0044] 9. A transmission mechanism; 91. A transmission shaft; 92. A driving wheel; 93. A driven wheel; 94. A transmission gear set. DETAILED DESCRIPTION

[0045] The present application will be further described by way of examples without thereby limiting the present application to the examples described.

[0046] As shown in Figures 1-6 the present application provides a smoke purifying device, which comprises a smoke collecting pipeline 1, an impeller 2, a driving mechanism 31 and a radial magnetic bearing 32. Wherein, the smoke collecting pipeline 1 is formed with a smoke discharging passage 11 communicating with the outside, the impeller 2 is arranged in the smoke discharging passage 11, the driving mechanism 31 comprises a rotating shaft 311 and a magnetic bearing motor 312, wherein the rotating shaft 311 is connected with the impeller 2, the magnetic bearing motor 312 is arranged in the smoke collecting pipeline 1 and is sleeved on the outer circumferential side of the rotating shaft 311 to drive the rotating shaft 311 to rotate along the axis thereof. On this basis, the radial magnetic bearing 32 is also arranged in the smoke collecting pipeline 1 and is sleeved on the outer circumferential side of the rotating shaft 311, the radial magnetic bearing 32 can support the rotating shaft 311 at the axis position of the magnetic bearing motor 312 by magnetic force.

[0047] In specific implementation, the rotating shaft 311 is located at the axis position of the smoke collecting pipeline 1, and the impeller 2 is correspondingly connected to the axial end of the rotating shaft 311 close to the smoke inlet. Exemplarily, the impeller 2 can use a centrifugal impeller 2, and the rotating shaft 311 is correspondingly connected to the central axis position of the centrifugal impeller 2 to drive the centrifugal impeller 2 to rotate by itself.

[0048] The magnetic bearing motor 312 is used to drive the rotating shaft 311 to rotate along its own axis. In other words, the magnetic bearing motor 312 can provide rotational driving force to the rotating shaft 311. In one possible embodiment, the magnetic bearing motor 312 includes a motor rotor and a motor stator. The motor rotor is sleeved on the rotating shaft 311 to ensure that the motor rotor can fully drive the rotating shaft 311 to rotate when rotating. Correspondingly, the motor stator is disposed on the outer ring of the motor rotor and forms an installation gap between the motor stator and the motor rotor.

[0049] The motor rotor is made of permanent magnets or conductive materials, and the motor stator is equipped with coil windings. When the coil windings are energized, they can generate a rotating magnetic field. Thus, when the rotating magnetic field is generated by the motor stator, the motor rotor can rotate under the action of the magnetic field.

[0050] Based on this, the radial magnetic levitation bearing 32 can magnetically support the rotating shaft 311 at the axial position of the magnetic bearing motor 312. In other words, the radial magnetic levitation bearing 32 can provide magnetic levitation force to the rotating shaft 311, so that the rotating shaft 311 can always remain at the axial position during rotation. In one possible embodiment, the radial magnetic levitation bearing 32 further includes a radial rotor and a radial stator, wherein the radial rotor is sleeved on the rotating shaft 311, and the radial stator is located radially outside the radial rotor, and the radial stator is provided with a first coil winding arranged circumferentially on itself.

[0051] For example, the motor rotor and the radial rotor of the radial magnetic bearing 32 are both fixedly connected to the shaft 311. During the normal rotation of the shaft 311, the radial magnetic bearing 32 can provide the radial rotor with a levitation force relative to the radial stator along its own circumference by energizing the first coil winding on the radial stator, so as to ensure support for the shaft 311.

[0052] In this way, during the rotation of the shaft 311, the shaft 311 and the motor rotor can be completely suspended in the air. When the motor rotor and the motor stator rotate relative to each other, no frictional loss will occur, thus avoiding noise problems caused by friction to a certain extent.

[0053] In summary, the fume purification device provided in this embodiment of the invention includes a fume collection duct 1, an impeller 2, a drive mechanism 31, and a radial magnetic levitation bearing 32. The drive mechanism 31 includes a rotating shaft 311 and a magnetic bearing motor 312. The rotating shaft 311 is connected to the impeller 2 to drive it to rotate. The magnetic bearing motor 312 is further disposed on the outer periphery of the rotating shaft 311 to drive it to rotate along its own axis. Thus, the magnetic bearing motor 312 can drive the motor rotor and the rotating shaft 311 to rotate through the rotating magnetic field generated by the motor stator on the motor rotor. Furthermore, because the motor rotor and motor stator are separately arranged, the gap between them prevents the motor rotor and the rotating shaft 311 from contacting the motor stator during rotation. Therefore, the magnetic bearing motor 312... During the rotation of the shaft 311, no frictional loss is generated, and no noise is generated due to internal friction. On this basis, the radial magnetic levitation bearing 32 can support the shaft 311, keeping the motor rotor mounted on the shaft 311 at the center of the motor stator. Furthermore, since the radial magnetic levitation bearing 32 also supports the shaft 311 at the axis of the bearing motor through magnetic force, no internal frictional loss or frictional noise occurs during the rotation of the shaft 311. Therefore, the oil fume purification device of the present invention, compared with the traditional induction motor, not only avoids the noise problem caused by friction to a certain extent, but also further improves the motor efficiency by avoiding frictional loss.

[0054] Furthermore, in some embodiments, the fume purification device also includes a radial sensor 33 and a control system. The radial sensor 33 is disposed corresponding to the rotating shaft 311 to acquire the radial displacement of the rotating shaft 311 and generate a radial displacement signal. The control system is electrically connected to both the radial sensor 33 and the first coil winding to adjust the current of the first coil winding according to the radial displacement signal, so as to change the electromagnetic force between the radial stator and the radial rotor at any position along the circumference.

[0055] After prolonged use, oil stains accumulate on the surface of the impeller 2 connected to the shaft 311 in the fume purification device. The irregular distribution of these oil stains causes a dynamic imbalance in the impeller 2, resulting in it tilting towards the side with more oil stains. This tilts the shaft 311, affecting the normal operation of the motor. Using traditional mechanical bearings for support would cause wear on these bearings, affecting their normal operation and generating significant noise.

[0056] In this embodiment of the invention, by setting up a radial sensor 33 and a control system, the radial sensor 33 can realize real-time monitoring of the radial position of the rotating shaft 311. Thus, when the overall center of gravity of the rotating shaft 311 changes due to the adhesion of oil on the surface of the impeller 2, causing a shift, the radial sensor 33 can monitor and capture the radial position change of the rotating shaft 311, convert the displacement signal of the rotating shaft 311 into a radial displacement signal in the form of an electrical signal, and then further transmit the radial displacement signal to the control system.

[0057] After receiving the radial displacement signal, the control system can automatically calculate the actual offset position of the rotating shaft 311, then generate a first control command, and output a current signal according to the first control command. This current signal is used to adjust the current supplied to the first coil winding at the corresponding offset position on the radial stator, so as to change the electromagnetic force formed by the first coil winding, so as to compensate for the corresponding offset position with electromagnetic force, thereby adjusting the radial rotor to the original balance position, and the magnetic levitation bearing motor returns to normal.

[0058] In practice, the radial sensor 33 can obtain the offset direction and offset displacement of the rotating shaft 311, and can transmit all the obtained data signals to the control system. Since there are multiple sets of first coil windings on the radial stator, the control system can specifically change the current in the winding of the radial offset of the rotating shaft 311, that is, change the electromagnetic force of the electromagnets on both sides of the radial direction, so that the radial rotor can be moved back to the equilibrium position through the adjustment of the force.

[0059] For example, the control system includes a controller and a power amplifier. The controller receives the radial displacement signal from the radial sensor 33 and compares it with a preset target position (typically zero deviation). Based on the position deviation, a specific control algorithm calculates the corrective force to be applied to the radial stator. This force command is converted into a corresponding control voltage signal. The power amplifier receives the control command from the controller and amplifies it into a current capable of driving the first coil winding.

[0060] It should be noted that the radial sensor 33 monitors the position of the rotating shaft 311 continuously. In other words, the radial sensor 33 can continuously monitor and send signals to the control system to ensure the timeliness of the corresponding effect.

[0061] like Figure 4 As shown, in some embodiments, the number of radial magnetic levitation bearings 32 can be set to two, and the two radial magnetic levitation bearings 32 are respectively located on opposite sides of the bearing motor along the axial direction of the rotating shaft 311. This arrangement can provide better radial support for the rotating shaft 311.

[0062] Based on the above, a radial sensor 33 can be installed near each radial magnetic levitation bearing 32 on the rotating shaft 311. This allows for monitoring of the offset at two locations along the axial direction of the rotating shaft 311. Furthermore, positioning the radial sensor 33 close to the radial magnetic levitation bearing 32 reduces the distance between them, thus minimizing the difference between the offset detected by the sensor and the actual offset of the radial rotor and stator. This improves the accuracy of signal acquisition and current control, resulting in more precise adjustments.

[0063] In addition, to improve the comprehensiveness of signal acquisition, two radial sensors 33 can be set at the position of each radial magnetic levitation bearing 32 near the rotating shaft 311. The two radial sensors 33 are respectively set in the same circumference of the rotating shaft 311 and are located at two mutually perpendicular radial positions in the same circumference.

[0064] This configuration allows for displacement monitoring in two different directions at the location of each radial magnetic levitation bearing 32, thereby increasing the detectable offset range and angle and further ensuring detection accuracy. In other embodiments, more than two radial sensors 33 can be used to achieve even higher detection accuracy and comprehensiveness.

[0065] In a practical implementation, the radial sensor 33 can be an eddy current sensor to achieve better detection accuracy. Of course, other types of sensor structures can also be used in other embodiments.

[0066] To provide some protection for the radial magnetic levitation bearing 32, in some embodiments, a radial protection bearing 34 is also provided on the rotating shaft 311, and an installation gap is formed between the radial protection bearing 34 and the rotating shaft 311. Furthermore, an annular gap is formed between the radial stator and the radial rotor, and the size of the installation gap is smaller than the size of the annular gap along the radial direction of the rotating shaft 311.

[0067] With this configuration, when the shaft 311 and the radial rotor fall under special circumstances, because the size of the installation gap is smaller than the size of the annular gap, the shaft 311 will first contact the radial protection bearing 34 when it falls. In this way, the radial protection bearing 34 can support the shaft 311. Thus, the radial rotor will not fall and directly impact the radial stator located on its outer ring, thereby avoiding potential damage to the radial stator.

[0068] In a practical implementation, the number of radial protection bearings 34 can be set to two, with the two radial protection bearings 34 located on both sides of the radial magnetic levitation bearing 32 along the axial direction of the rotating shaft 311. This arrangement can provide protection from both ends of the rotating shaft 311, thereby further ensuring the normal operation of the magnetic levitation bearing motor.

[0069] In order to achieve overall structural integration of the magnetic levitation bearing motor and to protect each bearing, in some embodiments, the magnetic levitation bearing motor also includes a bearing housing 37, the magnetic bearing motor 312 and the radial magnetic levitation bearing 32 are both disposed inside the bearing housing 37, and the rotating shaft 311 passes through the bearing housing 37.

[0070] The magnetic bearing motor 312 and radial magnetic levitation bearing 32 are integrated through the bearing housing 37 to form a magnetic levitation bearing motor system 3. This system can be manufactured independently relative to other structures such as the smoke collection duct 1. When forming an oil fume purification device, it can be installed in the smoke collection duct 1.

[0071] In addition to the magnetic bearing motor 312 and the radial magnetic levitation bearing 32, the magnetic levitation bearing motor system 3 also includes an axial magnetic levitation bearing 35 and an axial sensor 36. The axial protection bearing includes a thrust disk and two axial stators arranged coaxially. The thrust disk is sleeved on the rotating shaft 311, and the two axial stators are respectively arranged on both sides of the thrust disk in the axial direction. Furthermore, each of the two axial stators includes a second coil winding arranged along its own circumference.

[0072] Axial sensor 36 is also mounted on shaft 311 to acquire axial displacement of shaft 311 and generate axial displacement signal. Control system is electrically connected to axial sensor 36 and second coil winding to adjust the current of second coil winding of at least one axial stator according to axial displacement signal, so as to change the electromagnetic force between at least one axial stator and thrust disk.

[0073] In a specific implementation, the axial magnetic levitation bearing 35 can be set on the side of the radial magnetic levitation bearing 32 away from the impeller 2. Correspondingly, the axial sensor 36 is set on one side of the axial magnetic levitation bearing 35, and the detection head of the axial sensor 36 is set in correspondence with the rotating shaft 311.

[0074] In order to facilitate the installation of the magnetic levitation bearing motor system 3 in the smoke collection duct 1, in some embodiments, the fume purification device also includes a support component 4, and the bearing housing 37 is set in the smoke collection duct 1 through the support component 4.

[0075] Furthermore, the support assembly 4 includes a first support plate 41 and a support bracket 42, wherein one end of the support bracket 42 is connected to the first support plate 41, and the other end of the support bracket 42 is connected to the wall of the smoke collection pipe 1. Furthermore, a mounting portion 371 is provided at one axial end of the bearing housing 37, through which the rotating shaft 311 can pass. A first mounting opening is provided on the first support plate 41, through which the mounting portion 371 can pass, so that the bearing housing 37 is connected to the support assembly 4.

[0076] Please see Figure 5 As shown, the support bracket 42 can be configured as a plate connecting section and an axial connecting section. The plate connecting section is connected to the surface of the first support plate 41, for example, by welding. The axial connecting section is connected to the end of the plate connecting section near the pipe wall, so as to achieve the connection between the first support plate 41 and the smoke collection pipe 1 through the support bracket 42, while avoiding affecting the installation of the first support plate 41 in the smoke collection pipe 1. For example, there are two axial connecting sections, which are respectively connected to the two ends of the plate connecting section.

[0077] In a specific implementation, the first support plate 41 can be arranged along a radial plane of the smoke collection pipe 1 so that the rotating shaft 311 can be located at the axial position of the smoke collection pipe 1. In addition, the connection between the mounting part 371 of the bearing housing 37 and the first mounting port can be achieved by having the mounting part 371 pass through the first mounting port and have an interference fit with the first mounting port.

[0078] Based on the above, the impeller 2 is located on the opposite side of the first support plate 41 relative to the bearing housing 37 along the axial direction. The end of the rotating shaft 311 can pass through the mounting part 371 and the first mounting port and connect with the impeller 2. This arrangement not only facilitates the assembly of the magnetic levitation bearing motor system 3 but also makes it easy for the rotating shaft 311 to dock with the impeller 2, thereby allowing the rotating shaft 311 to easily drive the impeller 2 to rotate. For example, the rotating shaft 311 passes through the axial position of the impeller 2, and the rotating shaft 311 and the impeller 2 can be further connected and secured by a fastening nut to ensure a reliable and stable connection between the two.

[0079] like Figure 5 As shown, in some embodiments, the support assembly 4 further includes a second support plate 43, which is connected to the pipe wall of the smoke collection pipe 1 along its circumference. The other end of the support bracket 42 is connected to the second support plate 43. Correspondingly, the impeller 2 is disposed between the first support plate 41 and the second support plate 43. By providing the second support plate 43, it is convenient to connect and fix the support bracket 42 to the pipe wall of the smoke collection pipe 1, while not affecting the placement of the impeller 2.

[0080] In a specific implementation, an annular gap is formed between the outer periphery of the impeller 2 and the pipe wall of the smoke collection pipe 1. The axial connecting section of the support bracket 42 is located within this annular gap, and the second support plate 43 is located on the other side of the annular gap relative to the first support plate 41. This not only facilitates the connection of the support bracket 42, but also creates an installation space between the second support plate 43 and the first support plate 41 for placing the impeller 2.

[0081] Of course, in other embodiments, the support bracket 42 may be directly connected to the pipe wall of the smoke collection pipe 1.

[0082] In one specific implementation, the impeller 2 is a centrifugal impeller 2, with one axial end of the impeller 2 connected to the rotating shaft 311, and the other axial end of the impeller 2 having an air inlet 21. This configuration utilizes the axial air intake and radial air exhaust characteristics of the centrifugal impeller 2, allowing the magnetic levitation bearing motor system 3 to drive the impeller 2 to rotate via the rotating shaft 311. This enables the impeller 2 to drive the airflow within the smoke collection duct 1 while the magnetic levitation bearing motor system 3 does not affect the airflow. Specifically, because an annular gap is formed between the impeller 2 and the wall of the smoke collection duct 1, the gas drawn in through the air inlet 21 of the impeller 2 flows radially through the impeller 2 into the annular gap, and finally exits through the smoke collection duct 1 from the exhaust port 15 of the smoke collection duct 1.

[0083] Based on this, a smoke collection port 44 is provided at the position corresponding to the air inlet 21 of the second support plate 43, and an annular smoke collection plate 5 is provided at the smoke collection port 44. One end of the annular smoke collection plate 5 is smoothly connected to the opening edge of the smoke collection port 44, and the other end of the annular smoke collection plate 5 extends toward the position of the air inlet 21. Furthermore, the outer contour dimension of the smoke collection plate is gradually reduced along the direction of the smoke collection port 44 toward the air inlet 21.

[0084] The design of the smoke collection port 44 in conjunction with the annular smoke collection plate 5 can gather the airflow and oil fumes in the smoke collection pipe 1 toward the air inlet 21 of the impeller 2, thereby enabling the impeller 2 to achieve a better air intake effect.

[0085] like Figure 3 As shown, in some embodiments, the smoke collection pipe 1 includes a first pipe section 12 and a second pipe section 13 coaxially arranged and connected. The first pipe section 12 is provided with a first flange at its end, and the second pipe section 13 is provided with a second flange at its end. The first pipe section 12 and the second pipe section 13 are connected through the first flange and the second flange. On this basis, the circumferential side of the first support plate 41 is sandwiched between the first flange and the second flange.

[0086] This design facilitates the connection and fixation of the first support plate 41, while also allowing the long smoke collection pipe 1 to be manufactured in two parts, reducing structural production costs and making it easier to install other internal components within the smoke collection pipe 1.

[0087] For example, the magnetic levitation bearing motor system 3 and the impeller 2 are disposed within the second duct section 13. The fume purification device also includes a filter 6, which is located within the first duct section 12 and is disposed corresponding to the smoke collection port 44 on the second support plate 43. The filter 6 is used to filter the airflow entering the smoke collection duct 1 to prevent the oil fumes from being directly discharged into the atmosphere and causing air pollution.

[0088] In addition, a side air inlet pipe 14 is also provided on the first pipe section 12. The side air inlet pipe 14 allows the exhaust channel 11 in the fume purification device to bend and extend, so as to install the fume purification device in a limited space and achieve the smoke extraction effect.

[0089] like Figure 2 As shown, in some embodiments, a smoke exhaust port 15 is formed on the smoke collection duct 1, which communicates with the smoke exhaust channel 11. A rain cover 7 is provided on the smoke exhaust port 15, and the rain cover 7 has a plurality of air outlet holes 71. The rotating shaft 311 is drivenly connected to the rain cover 7 so that the rain cover 7 can rotate relative to the smoke collection duct 1.

[0090] The rain cover 7 prevents external rainwater from flowing into the smoke collection pipe 1 and affecting the normal operation of internal components. Furthermore, the rain cover 7 is connected to the rotating shaft 311, allowing the shaft 311 to drive the impeller 2 while simultaneously rotating the rain cover 7. This causes rainwater on the rain cover 7 to be flung out by centrifugal force, further enhancing its rainproof and waterproofing effects. Specifically, the outer surface of the rain cover 7 can be designed as a convex structure with a higher center and lower edges to achieve better water-spraying performance.

[0091] For example, the center of the rain cover 7 is connected to the rotating shaft 311, and the outer edge of the rain cover 7 is connected to the exhaust port 15 of the smoke collection pipe 1 through the outer ring bearing 8, so as to limit and support the rain cover 7 while allowing the rain cover 7 to rotate relative to the smoke collection pipe 1.

[0092] In one possible implementation, the air outlet 71 can be configured as a strip-shaped hole, and all air outlets 71 are arranged in a spiral pattern on the rain cover 7. This arrangement facilitates the timely and rapid discharge of oil fumes from the smoke collection duct 1. Furthermore, in another possible implementation, the extension direction of the air outlet 71 can be inclined relative to the axial direction of the rotating shaft 311. This arrangement achieves better ventilation and further prevents external rainwater from flowing into the smoke collection duct 1 through the air outlet 71.

[0093] Since the rotating shaft 311 drives the impeller 2 to rotate at a relatively high speed, while the rain cover 7 does not require a high speed, in some embodiments, the fume purification device may also include a transmission mechanism 9, through which the rotating shaft 311 and the rain cover 7 are connected. Further, the transmission mechanism 9 includes a transmission shaft 91, and a meshing drive wheel 92 and a driven wheel 93. The transmission shaft 91 is mounted on the rain cover 7 and extends along the rotational axis of the rain cover 7. The driven wheel 93 is sleeved on the transmission shaft 91, and the drive wheel 92 is sleeved on the rotating shaft 311. The number of teeth on the driven wheel 93 is greater than the number of teeth on the drive wheel 92.

[0094] This configuration allows for adjustment of the rotational speed of the rain cover 7 via the meshing drive wheel 92 and driven wheel 93. Specifically, since the driven wheel 93 has more teeth than the drive wheel 92, its rotational speed is lower than that of the drive wheel 92. Because the driven wheel 93 is mounted on the drive shaft 91 connected to the rain cover 7, the rotational speed of the rain cover 7 can be reduced synchronously. This structure is simple, reliable, and easy to install.

[0095] In a specific implementation, a transmission gear set 94 can be further provided between the driving wheel 92 and the driven wheel 93 to achieve a higher speed ratio between the driving wheel 92 and the driven wheel 93.

[0096] In summary, the working mechanism of the oil fume purification device provided in the embodiments of the present invention is basically as follows:

[0097] When the magnetic bearing motor 312 is powered on, the impeller 2 connected to the rotating shaft 311 begins to rotate. At this time, airflow suction is generated at the air inlet 21 of the impeller 2, which draws the oil fumes into the smoke collection pipe 1. After being filtered by the filter 6, the oil fumes are captured by the smoke collection port 44 on the second support plate 43 and drawn into the air inlet 21 of the impeller 2. Subsequently, under the rotation of the impeller 2, the filtered oil fumes are thrown out in the circumferential direction of the blades. At the same time, the rain cover 7 driven by the rotating shaft 311 rotates, thereby creating a high negative pressure inside the smoke collection pipe 1 on the rain cover 7, which allows the filtered oil fumes to be discharged more quickly through this negative pressure zone.

[0098] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. An oil fume purification device, characterized in that, include: A smoke collection duct, wherein a smoke exhaust channel connecting to the outside is formed inside the smoke collection duct; The impeller is located within the exhaust duct; The drive mechanism includes a rotating shaft and a magnetic bearing motor. The rotating shaft is connected to the impeller, and the magnetic bearing motor is disposed inside the smoke collection pipe and sleeved on the outer periphery of the rotating shaft to drive the rotating shaft to rotate along its own axis. A radial magnetic levitation bearing is installed inside the smoke collection duct and sleeved on the outer circumference of the rotating shaft. The radial magnetic levitation bearing can magnetically support the rotating shaft at the axis position of the bearing motor.

2. The oil fume purification device as described in claim 1, characterized in that, The radial magnetic levitation bearing includes a radial rotor and a radial stator. The radial rotor is sleeved on the rotating shaft, and the radial stator is located radially outside the radial rotor. The radial stator includes a first coil winding arranged circumferentially. The fume purification device also includes a radial sensor and a control system. The radial sensor is set corresponding to the rotating shaft to obtain the radial displacement of the rotating shaft and generate a radial displacement signal. The control system is electrically connected to both the radial sensor and the first coil winding to adjust the current of the first coil winding according to the radial displacement signal, so as to change the electromagnetic force between the radial stator and the radial rotor at any position along the circumference.

3. The oil fume purification device as described in claim 2, characterized in that, The number of radial magnetic levitation bearings is two, and the two radial magnetic levitation bearings are respectively arranged on opposite sides of the bearing motor along the axial direction of the rotating shaft; A radial sensor is provided at a position near each of the radial magnetic levitation bearings on the rotating shaft.

4. The oil fume purification device as described in claim 3, characterized in that, Two radial sensors are provided near each of the radial magnetic levitation bearings on the rotating shaft. The two radial sensors are located on the same circumference of the rotating shaft and at two mutually perpendicular radial positions on the same circumference.

5. The oil fume purification device according to claim 1, characterized in that, The fume purification device includes a bearing housing, the magnetic bearing motor and the radial magnetic levitation bearing are both disposed inside the bearing housing, and the rotating shaft passes through the bearing housing; The fume purification device also includes a support assembly, through which the bearing housing is connected to the fume collection duct.

6. The oil fume purification device according to claim 5, characterized in that, The support assembly includes a first support plate and a support bracket, one end of the support bracket is connected to the first support plate, and the other end of the support bracket is connected to the wall of the smoke collection pipe; The bearing housing is provided with a mounting part at one axial end, and the rotating shaft can pass through the mounting part. The first support plate is provided with a first mounting port, and the mounting part can be inserted into the first mounting port so that the bearing housing is connected to the support assembly. The impeller is located on the opposite side of the first support plate relative to the bearing housing in the axial direction, and the end of the shaft can pass through the mounting part and the first mounting port and be connected to the impeller.

7. The oil fume purification device according to claim 6, characterized in that, The support assembly further includes a second support plate, which is connected to the pipe wall of the smoke collection pipe along the circumference of the smoke collection pipe, and the other end of the support bracket is connected to the second support plate; The impeller is disposed between the first support plate and the second support plate.

8. The oil fume purification device according to claim 7, characterized in that, The impeller is a centrifugal impeller, with one axial end of the impeller connected to the rotating shaft and the other axial end of the impeller having an air inlet. The second support plate is provided with a smoke collection port at the position corresponding to the air inlet. An annular smoke collection plate is provided at the smoke collection port. One end of the annular smoke collection plate is smoothly connected to the opening edge of the smoke collection port. The other end of the annular smoke collection plate extends toward the position of the air inlet. Furthermore, the outer contour dimension of the smoke collection plate is gradually reduced along the direction of the smoke collection port toward the air inlet.

9. The oil fume purification device according to claim 7, characterized in that, The smoke collection duct includes a first duct section and a second duct section that are coaxially arranged and connected. The first pipe section is provided with a first flange at its end, and the second pipe section is provided with a second flange at its end. The first pipe section and the second pipe section are connected through the first flange and the second flange. The circumferential side of the first support plate is sandwiched between the first flange and the second flange.

10. The oil fume purification device according to any one of claims 1-9, characterized in that, The smoke collection pipe has a smoke exhaust port that connects to the smoke exhaust channel; The fume purification device also includes a rain cover, which is installed over the exhaust port and has several air outlet holes. The rotating shaft is connected to the rain cover so that the rain cover can rotate relative to the smoke collection pipe.

11. The oil fume purification device according to claim 10, characterized in that, The air outlet is a strip-shaped hole, and all the air outlets are arranged in a spiral pattern on the rain cover; and / or, Along the axial direction of the rotating shaft, the extension direction of the air outlet is inclined relative to the axial direction of the rotating shaft.

12. The oil fume purification device according to claim 10, characterized in that, The fume purification device also includes a transmission mechanism, and the rotating shaft and the rain cover are connected by the transmission mechanism. The transmission mechanism includes a transmission shaft, and a driving wheel and a driven wheel that mesh with each other. The transmission shaft is disposed on the rain cover and extends along the rotation axis of the rain cover. The driven wheel is sleeved on the transmission shaft, and the driving wheel is sleeved on the rotating shaft. The number of teeth on the driven wheel is greater than the number of teeth on the driving wheel.

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