Pumping and discharging device and oil smoke pumping and discharging equipment

Abstract

The invention belongs to the technical field of electric appliances, and particularly discloses a pumping and discharging device and oil smoke pumping and discharging equipment. The pumping drainage device comprises a main fan, a mounting bracket and an auxiliary pumping drainage piece. A motor shaft of the main fan is coaxially connected with a transmission shaft; the transmission shaft extends out of an air inlet of the main fan; the mounting bracket is positioned outside the main fan; the auxiliary pumping and discharging pieces are installed on the installation support and at least two auxiliary pumping and discharging pieces are arranged around the transmission shaft at intervals, and the transmission shaft is in transmission connection with the auxiliary pumping and discharging pieces, so that rotation of the motor shaft drives all the auxiliary pumping and discharging pieces to rotate to form negative pressure in the direction away from the air inlet of the main draught fan. The oil fume pumping and discharging equipment comprises an oil fume collecting hood with an oil fume collecting cavity and a pumping and discharging device, the pumping and discharging device is installed on the oil fume collecting hood, and at least the installation support and the auxiliary pumping and discharging piece are located in the oil fume collecting cavity. According to the exhaust device and the lampblack exhaust equipment disclosed by the invention, the running negative pressure can be increased, the negative pressure action range can be enlarged, the smoke leakage probability can be reduced, and the lampblack exhaust efficiency and the lampblack exhaust effect can be improved.

Description

Technical Field

[0001] This invention relates to the field of electrical technology, and in particular to a range hood and an exhaust device. Background Technology

[0002] Range hoods are common kitchen appliances that can extract cooking fumes during cooking to purify the kitchen environment and improve the cooking experience.

[0003] Existing range hoods typically consist of a smoke collection hood and a fan. The smoke collection hood has a smoke inlet and an internal smoke collection chamber. The fan's air inlet is connected to the smoke collection chamber, and its air outlet is connected to the exhaust pipe. When the fan is running, it generates negative pressure at the smoke inlet, which forces the cooking fumes into the smoke collection chamber and then exhausts them to the exhaust pipe.

[0004] The fume extraction capacity of existing range hoods is mainly determined by the negative pressure generated by the fan at the smoke inlet. When the smoke collection chamber is large or the smoke inlet is far from the fan, there may be insufficient local negative pressure at the smoke inlet, which will cause smoke to escape, affecting the smoke extraction effect of the range hood and reducing the user experience. Summary of the Invention

[0005] One of the technical problems solved by this invention is to provide a pumping device that can effectively solve the problem of insufficient negative pressure in existing pumping devices, enhance the negative pressure generated during operation of the pumping device, and improve pumping capacity.

[0006] The second technical problem solved by this invention is to provide an oil fume extraction device that can effectively solve the problem of severe smoke leakage caused by insufficient negative pressure generated by the extraction device in existing oil fume extraction devices, reduce the probability of smoke leakage, and improve the efficiency and effect of oil fume extraction.

[0007] The first technical problem mentioned above is solved by the following technical solution:

[0008] A pumping device, comprising:

[0009] The main fan has a motor shaft coaxially connected to a drive shaft, which extends out of the air inlet of the main fan.

[0010] The mounting bracket is located on the outside of the main fan.

[0011] Auxiliary exhaust components are installed on the mounting bracket and at least two are spaced apart around the drive shaft. The drive shaft is connected to the auxiliary exhaust components so that the rotation of the motor shaft drives all the auxiliary exhaust components to rotate, thereby creating negative pressure in a direction away from the air inlet of the main fan.

[0012] The extraction device of the present invention has the following advantages compared with the prior art: By setting a main fan and an auxiliary extraction component that can generate negative pressure away from the air inlet of the main fan through rotation, the operation of the main fan can generate negative pressure at the smoke inlet, and the rotation of the auxiliary extraction component can also generate negative pressure at the smoke inlet, thereby enhancing the negative pressure at the smoke inlet, reducing the occurrence of smoke escape problems, and improving the smoke extraction effect; at the same time, since at least two auxiliary extraction components are arranged at intervals around the drive shaft, and the drive shaft is coaxially connected to the motor shaft of the main fan, the auxiliary extraction components are more closely positioned... With the smoke inlet positioned close to the exhaust port, the negative pressure area generated by the auxiliary exhaust component is relatively far from the central negative pressure area of ​​the main fan. This enhances the negative pressure at the edge of the main fan's negative pressure area, expanding the negative pressure range of the exhaust device and the magnitude of the negative pressure at the edge of the smoke collection chamber. This further reduces smoke leakage and improves the smoke extraction effect. Furthermore, since the auxiliary exhaust component is connected to the motor shaft of the main fan, the rotation of the main fan's motor shaft drives the auxiliary exhaust component to rotate. This allows the main fan and the auxiliary exhaust component to share a common drive source, reducing the number of drive sources and lowering the cost of the smoke collection device.

[0013] In one embodiment, the mounting bracket is fixed relative to the volute of the main fan, the auxiliary exhaust component is rotatably mounted on the mounting bracket, and the rotation of the motor shaft drives the auxiliary exhaust component to rotate relative to the mounting bracket.

[0014] In one embodiment, the motor shaft and the auxiliary drawer are connected by a transmission assembly, and the auxiliary drawer is rotatably mounted on the mounting bracket via a mounting shaft.

[0015] The transmission assembly includes a driving gear and a driven gear. The driven gear is configured in a one-to-one correspondence with the auxiliary extraction component and is sleeved on the mounting shaft. The driving gear is fixedly sleeved on the transmission shaft, and the driving gear meshes with the driven gear.

[0016] In one embodiment, both the driving gear and the driven gear have ventilation holes, and at least two ventilation holes are provided at circumferential intervals corresponding to the driving gear or the driven gear.

[0017] In one embodiment, the drive shaft rotates through the mounting bracket and is connected to the auxiliary exhaust component via a transmission assembly, wherein both the transmission assembly and the auxiliary exhaust component are located on the side of the mounting bracket away from the main fan.

[0018] And / or, the mounting bracket includes a bushing portion and a mounting arm portion, wherein the mounting arm portion is provided with multiple portions spaced apart along the circumference of the bushing portion and corresponding to the auxiliary drawer components one by one, and the auxiliary drawer components are rotatably mounted on the end of the mounting arm portion away from the bushing portion.

[0019] In one embodiment, the mounting arm has a protruding fixing column that extends toward the main fan and is used to connect to the volute or smoke hood of the main fan.

[0020] In one embodiment, the auxiliary exhaust component includes a fan or impeller.

[0021] The second technical problem mentioned above is solved by the following technical solution:

[0022] A fume extraction device includes a fume hood with a fume collection chamber. The fume extraction device also includes an extraction device as described above. The extraction device is installed on the fume hood, and at least the mounting bracket and the auxiliary extraction component are located inside the fume collection chamber.

[0023] Compared with the prior art, the fume extraction device of the present invention has the following advantages: by adopting the above-mentioned fume extraction device, the negative pressure at the smoke inlet of the smoke collection chamber can be enhanced, especially the negative pressure at the periphery of the smoke inlet, thereby reducing the probability of smoke escape, improving the fume extraction efficiency and extraction effect, and reducing the cost of the fume extraction device.

[0024] In one embodiment, the main fan is installed outside the smoke collection hood, the smoke collection hood has a smoke outlet that is directly connected to the air inlet of the main fan, and the drive shaft extends through the smoke outlet into the smoke collection chamber.

[0025] In one embodiment, the mounting bracket includes a fixed column extending in a direction toward the main fan, the fixed column being provided at intervals around the smoke outlet, and the fixed column being detachably connected to the smoke hood or the volute of the main fan. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the fume extraction device provided in an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the smoke hood and main fan provided in an embodiment of the present invention;

[0028] Figure 3 This is a cross-sectional view of the fume extraction device provided in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the extraction device provided in an embodiment of the present invention from one perspective;

[0030] Figure 5 This is a schematic diagram of the extraction device provided in an embodiment of the present invention from another perspective;

[0031] Figure 6 This is a schematic diagram of the structure of the mounting bracket provided in an embodiment of the present invention;

[0032] Figure 7 A schematic diagram of the exhaust device provided in an embodiment of the present invention after removing the main fan, viewed from one angle.

[0033] Figure 8 for Figure 7 A schematic diagram of the structure from another perspective;

[0034] Figure 9 for Figure 7 A sectional view of the middle structure;

[0035] Figure 10 for Figure 9 A magnified view of a section at point I;

[0036] Figure 11 This is a schematic diagram of the mounting shaft provided in an embodiment of the present invention.

[0037] Label Explanation:

[0038] 100. Exhaust device; 200. Smoke hood; 201. Smoke collection chamber; 202. Smoke outlet; 300. Check valve;

[0039] 1. Main fan; 11. Volute; 12. Impeller; 13. Drive motor; 131. Motor shaft; 14. Air guide ring;

[0040] 2. Auxiliary extraction and discharge components; 21. Central cylinder section; 22. Blades;

[0041] 3. Mounting bracket; 31. Bushing; 32. Mounting arm; 33. Fixing column; 34. Mounting sleeve;

[0042] 4. Drive shaft;

[0043] 5. Install the rotating shaft; 51. First shaft section; 52. Second shaft section; 53. Third shaft section;

[0044] 6. Transmission assembly; 61. Transmission gear; 61a. Driving gear; 61b. Driven gear; 611. Central ring; 612. Gear ring; 613. Hub; 614. Ventilation hole;

[0045] 7. First locking nut; 8. Second locking nut; 9. Fastening nut. Detailed Implementation

[0046] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0047] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0048] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0049] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0050] This embodiment provides an oil fume extraction device, which is used to extract oil fumes, reduce the probability of smoke escape, and improve the efficiency and effect of oil fume extraction.

[0051] like Figures 1 to 3 As shown, the fume extraction device provided in this embodiment includes a fume hood 200, an extraction device 100, and an exhaust pipe. The fume hood 200 has a fume collection chamber 201, with one side open to form a fume inlet. The extraction device 100 is at least partially located within the fume collection chamber 201; preferably, at least a mounting bracket 3 and an auxiliary extraction component 2 are located within the fume collection chamber 201. This creates a negative pressure at the fume inlet, causing the fumes to enter the fume collection chamber 201 under negative pressure and be discharged through the fume collection device into the exhaust pipe.

[0052] Specifically, the smoke collection device includes a main fan 1, a mounting bracket 3, and auxiliary exhaust components 2. The main fan 1 has a motor shaft 131 coaxially connected to a drive shaft 4, which extends out of the main fan 1's air inlet. The mounting bracket 3 is located outside the main fan 1. At least two auxiliary exhaust components 2 are mounted on the mounting bracket 3 and spaced around the drive shaft 4. The drive shaft 4 is connected to the auxiliary exhaust components 2 so that the rotation of the motor shaft 131 drives all the auxiliary exhaust components 2 to rotate, creating a negative pressure in a direction away from the main fan 1's air inlet.

[0053] The smoke collection device and fume extraction equipment provided in this embodiment, by setting a main fan 1 and an auxiliary extraction component 2 that can generate negative pressure away from the air inlet of the main fan 1 through rotation, allows the main fan 1 to generate negative pressure at the smoke inlet while the rotation of the auxiliary extraction component 2 also generates negative pressure at the smoke inlet, thereby enhancing the negative pressure at the smoke inlet, reducing the occurrence of smoke escape problems, and improving the fume extraction effect. Simultaneously, since at least two auxiliary extraction components 2 are spaced around the drive shaft 4, and the drive shaft 4 is coaxially connected to the motor shaft 131 of the main fan 1, the auxiliary extraction components 2 are positioned closer to the smoke inlet, while the auxiliary extraction... The negative pressure area generated by the auxiliary exhaust component 2 is relatively far away from the central negative pressure area of ​​the main fan 1, thereby enhancing the negative pressure at the edge of the negative pressure area of ​​the main fan 1, expanding the negative pressure range of the exhaust device 100 and the negative pressure at the edge of the smoke collection chamber 201, further reducing the occurrence of smoke leakage and improving the oil fume extraction effect; furthermore, since the auxiliary exhaust component 2 is connected to the impeller 12 shaft of the main fan 1, the rotation of the impeller 12 shaft of the main fan 1 drives the auxiliary exhaust component 2 to rotate, thereby making the main fan 1 and the auxiliary exhaust component 2 share the same drive source, reducing the number of drive sources and reducing the cost of the smoke collection device and oil fume extraction equipment.

[0054] In one embodiment, the main fan 1 is installed outside the smoke hood 200, and a smoke outlet 202 is provided at the bottom of the smoke collection chamber 201. The smoke outlet 202 is directly opposite the air inlet of the main fan 1, and the end of the drive shaft 4 passes through the smoke hood 200 and extends into the smoke collection chamber 201. This arrangement can reduce the size requirements of the smoke hood 200, improve the design flexibility of the smoke hood 200, and reduce costs. In other embodiments, the main fan 1 can also be installed inside the smoke hood 200, and the auxiliary exhaust component 2 is located between the main fan 1 and the smoke inlet.

[0055] It is worth noting that, in one embodiment, the fume extraction device is a top-mounted range hood, whose fume collection hood 200 has a bottom-opening fume inlet, and the main fan 1 is installed on the upper side of the fume collection hood 200. In other embodiments, the fume extraction device can be a side-mounted range hood.

[0056] In one embodiment, the cross-section of the smoke collection chamber 201 perpendicular to the axis of the drive shaft 4 is rectangular, and four auxiliary exhaust components 2 are provided, which are respectively arranged at the four corners of the smoke collection chamber 201. This can enhance the negative pressure at the periphery of the smoke collection chamber 201, effectively reduce the problem of smoke escape, and improve the efficiency of oil fume extraction.

[0057] In other embodiments, the cross-section of the smoke collection chamber 201 perpendicular to the motor shaft 131 can be of other shapes, and the number of auxiliary exhaust components 2 can be two, three, or other numbers. The number and position of the auxiliary exhaust components 2 can be specifically limited according to the size and shape of the smoke collection chamber 201, and the present invention does not impose any limitations on this.

[0058] like Figures 3 to 5 As shown, the main fan 1 includes a volute 11, an impeller 12, and a drive motor 13. The volute 11 has an air inlet at its first end and an air outlet on one side. The motor housing of the drive motor 13 is mounted on the second end of the volute 11, and the motor shaft 131 extends into the volute 11 along the axis of the air inlet. The impeller 12 is fixedly sleeved on the motor shaft 131 and located inside the volute 11, so that the rotation of the motor shaft 131 drives the impeller 12 to rotate, thereby creating a negative pressure at the air inlet to promote airflow into the air inlet and out of the air outlet. To reduce intake noise and improve intake efficiency, the main fan 1 also includes a guide ring 14 installed at the air inlet.

[0059] Furthermore, the air outlet of the volute 11 is connected to the exhaust pipe via a check valve 300 to prevent backflow of external air. It is worth noting that in this invention, the main fan 1 can adopt the structure of an existing centrifugal fan. The specific structure of the main fan 1 and the check valve 300 is not the focus of this invention's improvement; therefore, this invention does not limit or elaborate on the specific structure of the main fan 1 and the check valve 300.

[0060] In one embodiment, the mounting bracket 3 is fixed relative to the volute 11 of the main fan 1, and the auxiliary exhaust component 2 is rotatably mounted on the mounting bracket 3. The rotation of the motor shaft 131 drives the auxiliary exhaust component 2 to rotate relative to the mounting bracket 3. This arrangement allows the mounting bracket 3 to be fixed, which reduces the drive load on the drive motor 13, thereby reducing the drive cost. At the same time, the rotatable mounting of the auxiliary exhaust component 2 on the mounting bracket 3 facilitates the enhancement of local negative pressure within the smoke collection chamber 201.

[0061] In other embodiments, the mounting bracket 3 can be rotatably connected to the motor shaft 131, that is, the rotation of the motor shaft 131 drives the mounting bracket 3 to rotate, thereby driving the auxiliary drawer 2 to rotate, so that the mounting bracket 3 and the auxiliary drawer 2 together form a negative pressure when rotating. In this case, the auxiliary drawer 2 can be a fan blade structure, and multiple fan blade structures are arranged at intervals around the mounting bracket 3.

[0062] The mounting bracket 3 is detachably connected to the smoke hood 200 or the volute 11 of the main fan 1. In one embodiment, the mounting bracket 3 includes a main frame portion, which is spaced apart from the cavity wall of the mounting cavity. The main frame portion extends along the direction toward the main fan 1 and has a fixing column portion 33. Multiple fixing columns 33 are spaced around the smoke outlet 202. One end of the fixing column portion 33 away from the main frame portion is connected to the smoke hood 200 or the volute 11. This arrangement can improve the installation convenience and reliability of the mounting bracket 3 in the smoke hood 200 and improve the practicality of the extraction device 100 for smoke collection cavities 201 of different sizes.

[0063] In other embodiments, the side of the mounting bracket 3 may be connected to the side wall of the smoke collection chamber 201, or the mounting bracket 3 may be fixedly installed on the smoke collection hood 200 using other structures. The specific installation structure of the mounting bracket 3 and the smoke collection hood 200 can be set according to the specific structural form of the smoke collection hood 200, and the present invention does not limit it in this regard.

[0064] To better ensure the installation accuracy of the mounting bracket 3, one of the fixed column 33 and the smoke hood 200 is provided with a positioning protrusion, and the other is provided with a positioning groove. The positioning protrusion and the positioning groove are provided in a one-to-one correspondence. The positioning protrusion is inserted into the positioning groove to realize the installation positioning of the mounting bracket 3 in the smoke hood 200, so as to better ensure the accuracy and reliability of the installation position of the auxiliary exhaust component 2 in the smoke hood 200.

[0065] Furthermore, the wall of the smoke collection chamber 201 is provided with a boss, and the boss is provided in a corresponding manner to the mounting column. The boss is provided with a positioning groove, and the end of the fixing column 33 forms a positioning protrusion. The fixing column 33 and the smoke collection hood 200 are connected by fasteners that pass through the bottom of the positioning groove and the fixing column 33.

[0066] like Figures 6 to 9 As shown, the drive shaft 4 is connected to the auxiliary exhaust component 2 via the drive assembly 6. In one embodiment, the first end of the drive shaft 4 is coaxially connected to the motor shaft 131, and the second end of the drive shaft 4 passes through the mounting bracket 3. The auxiliary exhaust component 2 and the drive assembly 6 are both installed on the side of the mounting bracket 3 away from the main fan 1. This avoids interference between the drive assembly 6 and the auxiliary exhaust component 2 and the smoke hood 200 and the main fan 1, and improves the ease of installation of the drive assembly 6 and the auxiliary exhaust component 2 on the mounting bracket 3.

[0067] In one embodiment, the first end of the drive shaft 4 has an internal thread, and the end of the motor shaft 131 has a screw portion. The screw portion is screwed into the internal thread to connect the drive shaft 4 and the motor shaft 131. Further, the outer wall of the first end of the drive shaft 4 has a protruding ring portion. The outer wall of the protruding ring portion has a screwing groove or an operating surface. Multiple screwing grooves or operating surfaces are spaced apart along the circumference of the drive shaft 4 to facilitate screwing the drive shaft 4 using tools such as wrenches.

[0068] In one embodiment, the main frame includes a bushing portion 31 and mounting arms 32. The bushing portion 31 has a mounting shaft hole for the drive shaft 4 to drive. At least two mounting arms 32 extend radially around the bushing portion 31 and are spaced apart. Each mounting arm 32 corresponds to one of the auxiliary exhaust components 2. The second end of the drive shaft 4 passes through the mounting shaft hole, and the auxiliary exhaust component 2 is rotatably mounted on the end of the corresponding mounting arm 32 away from the bushing portion 31. This arrangement creates a ventilation channel between two adjacent mounting arms 32, reducing the impact of the mounting bracket 3 on the air intake resistance and improving the air intake smoothness of the main fan 1. At the same time, it can reduce the weight of the mounting bracket 3 while installing each auxiliary exhaust component 2. Furthermore, this structural arrangement of the mounting bracket 3 allows for control of the distance between the auxiliary exhaust component 2 and the drive shaft 4 by adjusting the length of the mounting arm 32, thereby setting the negative pressure position of the auxiliary exhaust component 2 and better meeting the needs of smoke hoods 200 of different sizes.

[0069] The axial length of the bushing portion 31 is greater than the thickness of the mounting arm portion 32 along the drive shaft 4, so as to reduce weight while ensuring the structural strength and rigidity at the center of the mounting bracket 3. A fixing column portion 33 is provided on the side of the mounting arm portion 32 facing the main fan 1, and the fixing column portion 33 is provided in a one-to-one correspondence with the mounting arm portion 32.

[0070] Furthermore, a weight-reducing groove is provided on the side of the mounting arm 32 away from the fixed column 33. The weight-reducing groove extends along the length of the mounting arm 32 to reduce the weight of the mounting bracket 3 while ensuring the overall structural strength and rigidity of the mounting bracket 3, thereby reducing the weight of the extraction device 100 and the fume extraction equipment.

[0071] The auxiliary drawer 2 is rotatably mounted on the mounting bracket 3 via a mounting shaft 5, which is parallel to and spaced apart from the drive shaft 4. In one embodiment, a mounting sleeve 34 is provided at the end of the mounting arm 32 away from the bushing 31. The mounting sleeve 34 is coaxially arranged with the bushing 31, and the mounting shaft 5 rotatably passes through the mounting sleeve 34. The axial height of the mounting sleeve 34 is greater than the thickness of the mounting arm 32 to ensure the structural strength of the connection between the mounting shaft 5 and the mounting bracket 3.

[0072] In one embodiment, the transmission assembly 6 includes multiple transmission gears 61, each comprising a driving gear 61a and multiple driven gears 61b. The driving gear 61a is fixedly mounted on the transmission shaft 4, and the driven gears 61b are correspondingly mounted on the mounting shaft 5 and mounted on the auxiliary extraction components 2. All driven gears 61b mesh with the driving gear 61a. Thus, the rotation of the transmission shaft 4 drives the driving gear 61a to rotate, which in turn drives the driven gears 61b to rotate, ultimately causing the auxiliary extraction components 2 connected to the driven gears 61b to rotate. The transmission assembly 6 employs a gear transmission structure, which facilitates the rotation of multiple auxiliary extraction components 2 with a relatively simple transmission structure, simplifying the structure of the extraction device 100 and reducing costs.

[0073] In one embodiment, both the driving gear 61a and the driven gear 61b have ventilation holes 614, and at least two ventilation holes 614 are arranged at circumferential intervals along the corresponding driving gear 61a or driven gear 61b. The arrangement of ventilation holes 614 can avoid the arrangement of the transmission gear 61 from having a significant impact on the flow resistance of oil fumes, and better ensure the effect of oil fume extraction; this arrangement can increase the outer diameter of the transmission gear 61 while reducing the weight of the transmission gear 61, thereby reducing the total load of the drive motor 13 and reducing the energy consumption required for the operation of the extraction device 100.

[0074] In one embodiment, each transmission gear 61 includes a central ring portion 611, a gear ring portion 612 coaxially and spaced outside the central ring portion 611, and a hub portion 613 connecting the gear ring portion 612 and the central ring portion 611. Multiple hub portions 613 are spaced circumferentially along the central ring portion 611. This arrangement creates ventilation holes 614 between adjacent hub portions 613. Furthermore, 3 to 6 hub portions 613 are spaced circumferentially along the central ring portion to increase the openwork area of ​​the driven gear 61b while ensuring the overall structural strength and rigidity of the driven gear 61b.

[0075] like Figures 9 to 11 As shown, the second end of the drive shaft 4 has an external thread, and a fastening nut 9 is screwed onto the threaded second end of the drive shaft 4. The fastening nut 9 presses against the drive gear 61a, and the drive gear 61a is clamped between the fastening nut 9 and the mounting bracket 3 to prevent the drive gear 61a from axially moving relative to the drive shaft 4. The cross-section of the second end of the drive shaft 4 is preferably a D-shaped cross-section, and the center hole of the drive gear 61a is preferably a D-shaped hole adapted to the D-shaped cross-section to prevent relative rotation between the drive shaft 4 and the drive gear 61a.

[0076] In one embodiment, the first end of the mounting shaft 5 rotates through the mounting sleeve 34 and has a first threaded section. The first threaded section is threaded with a first locking nut 7. The locking nut abuts against the side of the mounting sleeve 34 away from the auxiliary drawer 2, and the side of the mounting sleeve 34 away from the locking nut abuts against the driven gear 61b, thereby restricting the axial mounting position of the mounting shaft 5 relative to the mounting sleeve 34.

[0077] Furthermore, a rotating bearing is fitted onto the mounting shaft 5 and installed inside the mounting sleeve 34 to reduce the frictional resistance when the mounting shaft 5 rotates, thereby improving the smoothness of the rotation of the auxiliary extraction component 2.

[0078] The second end of the mounting shaft 5 is preferably detachably connected to the auxiliary drawer 2. This allows for adjustment of the distance between the auxiliary drawer 2 and the mounting arm 32 by setting the length of the mounting shaft 5, improving the ease and flexibility of installation of the auxiliary drawer 2, as well as the convenience of maintenance and replacement. In other embodiments, the mounting shaft 5 and the auxiliary drawer 2 can also be integrally formed or welded together.

[0079] Furthermore, the second end of the mounting shaft 5 is provided with a second threaded section and a limiting shoulder. The second threaded section passes through the auxiliary drawer 2 and is threaded with a second locking nut 8. The auxiliary drawer 2 abuts against the limiting shoulder and the second locking nut 8 respectively to restrict the auxiliary drawer 2 from moving axially along the mounting shaft 5 and ensure the reliability of the auxiliary drawer 2 on the mounting shaft 5.

[0080] Specifically, the mounting shaft 5 includes a first shaft segment 51, a second shaft segment 52, and a third shaft segment 53 connected in sequence. The outer diameter of the second shaft segment 52 is larger than the outer diameters of the first shaft segment 51 and the third shaft segment 53, so that a positioning step surface is formed between the second shaft segment 52 and the first shaft segment 51. The outer wall of the end of the first shaft segment 51 away from the third shaft segment 53 is provided with an external thread to form a first threaded segment. The driven gear 61b is sleeved on the first shaft segment 51 and its two ends abut against the mounting bracket 3 and the positioning step surface, respectively.

[0081] The cross-sections of the first shaft segment 51 and the third shaft segment 53 are both D-shaped. The auxiliary drawer 2 and the driven gear 61b are both provided with D-shaped mounting shaft holes to prevent the auxiliary drawer 2 from rotating relative to the mounting shaft 5, and to prevent the mounting shaft 5 and the driven gear 61b from rotating relative to each other, thereby reliably ensuring that the rotation of the driven gear 61b drives the auxiliary drawer 2 to rotate.

[0082] In one embodiment, the auxiliary exhaust component 2 includes a fan, thereby simplifying the structure of the auxiliary exhaust component 2 and reducing the overall weight and cost of the exhaust device 100 while ensuring the generation of negative pressure. In other embodiments, the auxiliary exhaust component 2 may also include a fan wheel or other structure capable of generating negative pressure through rotation.

[0083] Specifically, the fan includes a central cylinder 21 and blades 22. Multiple blades 22 are arranged around the central cylinder 21 at intervals. The mounting shaft 5 passes through the central cylinder 21, and the bottom of the central cylinder 21 is sandwiched between the second locking nut 8 and one end face of the second shaft section 52.

[0084] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0085] The specific embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A suction device, characterized in that The utility model relates to a kind of oil fume extraction equipment, including: Main fan (1), motor shaft (131) of the main fan (1) is coaxially connected with transmission shaft (4), the transmission shaft (4) extends the air inlet of the main fan (1); Mounting bracket (3) is located outside the main fan (1); Auxiliary extraction unit (2) is installed on the mounting bracket (3) and is at least interval arranged with two around the transmission shaft (4), the transmission shaft (4) is drivingly connected with the auxiliary extraction unit (2), so that the rotation of the motor shaft (131) drives all the auxiliary extraction unit (2) to rotate to form negative pressure in the direction away from the air inlet of the main fan (1).

2. The apparatus according to claim 1, wherein The mounting bracket (3) is fixed relative to the volute (11) of the main fan (1), the auxiliary extraction unit (2) is rotatably mounted on the mounting bracket (3), and the rotation of the motor shaft (131) drives the auxiliary extraction unit (2) to rotate relative to the mounting bracket (3).

3. The apparatus of claim 2, wherein The motor shaft (131) and the auxiliary extraction unit (2) are drivingly connected by a transmission assembly (6), and the auxiliary extraction unit (2) is rotatably mounted on the mounting bracket (3) by a mounting shaft (5); The transmission assembly (6) includes a driving gear (61a) and a driven gear (61b), the driven gear (61b) is one-to-one corresponding with the auxiliary extraction unit (2) and is sleeved on the mounting shaft (5), and the driving gear (61a) is fixedly sleeved on the transmission shaft (4), and the driving gear (61a) is engaged with the driven gear (61b).

4. The apparatus according to claim 3, wherein The driving gear (61a) and the driven gear (61b) each have a ventilation hole (614), and the ventilation hole (614) is interval arranged along the circumferential direction of the driving gear (61a) or the driven gear (61b) at least two.

5. The apparatus according to claim 2, wherein The transmission shaft (4) rotates through the mounting bracket (3) and is drivingly connected with the auxiliary extraction unit (2) by the transmission assembly (6), and the transmission assembly (6) and the auxiliary extraction unit (2) are located on the side of the mounting bracket (3) away from the main fan (1); And / or, the mounting bracket (3) includes a shaft sleeve portion (31) and a mounting arm portion (32), the mounting arm portion (32) is interval arranged along the circumferential direction of the shaft sleeve portion (31) and is one-to-one corresponding with the auxiliary extraction unit (2), and the auxiliary extraction unit (2) is rotatably mounted on the end of the mounting arm portion (32) away from the shaft sleeve portion (31).

6. The apparatus according to claim 5, wherein The mounting arm portion (32) is provided with a fixed column portion (33), the fixed column portion (33) extends in the direction towards the main fan (1), and the fixed column portion (33) is used for being connected with the volute (11) or the smoke hood (200) of the main fan (1).

7. A suction device according to any one of claims 1-6, characterised in that The auxiliary extraction unit (2) includes a fan or a wind wheel.

8. An oil fume extraction equipment comprising a smoke collecting hood (200) having a smoke collecting cavity (201), characterized in that, The oil fume extraction equipment further includes the extraction device of any one of claims 1-7, and the extraction device is installed on the smoke hood (200), and at least the mounting bracket (3) and the auxiliary extraction unit (2) are located in the smoke cavity (201).

9. The oil fume extraction equipment according to claim 8, characterized in that, The main fan (1) is installed outside the smoke hood (200), the smoke hood (200) is provided with a smoke outlet (202) which communicates with the air inlet of the main fan (1) in a positive direction, and the transmission shaft (4) extends into the smoke cavity (201) through the smoke outlet (202).

10. The oil fume extraction equipment according to claim 9, characterized in that, The mounting bracket (3) comprises a fixed column portion (33) extending towards the main fan (1), and a plurality of fixed column portions (33) are arranged at intervals around the smoke outlet (202), and the fixed column portion (33) is detachably connected with the smoke hood (200) or the volute (11) of the main fan (1).

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