Integrated two-stage total-pressure synergistic fan system and oil smoke suction and exhaust equipment

Abstract

The invention discloses an integrated two-stage total-pressure synergistic fan system and oil smoke suction and exhaust equipment, a blade assembly comprises a first-stage blade group and a second-stage blade group which are integrated on the same wheel carrier, and each of the first-stage blade group and the second-stage blade group comprises a plurality of blades which are distributed at intervals in the circumferential direction to form an annular structure; the first-stage blade group and the second-stage blade group are coaxial with each other; first-stage blades of the first-stage blade group penetrate through the central connecting body and are positioned in working areas on the front side and the rear side of the impeller; secondary blades of the secondary blade group are connected between the front ring and the rear ring and penetrate through the middle disc; the rotating directions of all the first-stage blades are the same, the rotating directions of all the second-stage blades are the same, and the rotating directions of the first-stage blades are opposite to the rotating directions of the second-stage blades; and the first-stage blade group performs first-stage acting, so that the airflow speed is remarkably increased in a short time, the static pressure energy of the fan system is improved, the airflow is turned in advance, the energy loss is reduced, the airflow is more uniform, the total pressure efficiency of the fan system is improved, and the air performance of the fan system is optimized.

Description

Technical Field

[0001] The present invention relates to the technical field of fan systems, and in particular to an integrated two-stage full-pressure efficiency-enhancing fan system and oil fume suction and exhaust equipment. Background Art

[0002] As modern families have higher requirements for kitchen environment, oil fume exhaust equipment has become one of the indispensable equipment in the kitchen. The core component of oil fume exhaust equipment is the fan system, and its performance directly affects the smoke extraction effect and user experience of the oil fume exhaust equipment. The fan system mainly includes impellers, motors, volutes and other components, among which the design of the impeller plays a decisive role in the performance of the fan.

[0003] Patent No. CN219865582U: This invention patent discloses an impeller for a double-inlet centrifugal fan, a centrifugal fan, and an oil fume suction and exhaust device. The impeller design includes front and rear discs and a middle disc, and the blades are arranged circumferentially along the middle disc. The special feature is that the design of the blades can reduce the difference in flow state on both sides of the impeller, reduce secondary flow, thereby improving fan performance and reducing noise. The blades are designed such that the first blade profile includes at least two arc segments that are sequentially connected from the first side to the second side and whose curvature radius increases sequentially, and the second blade profile includes at least three arc segments that are sequentially connected from the third side to the fourth side and whose curvature radius increases sequentially. The arc length of the first blade profile is less than the arc length of the second blade profile, and at least one arc of the first blade at the air inlet end adjacent to the impeller overlaps with the projection of at least one arc of the second blade at the air inlet end adjacent to the impeller in the axial direction of the impeller.

[0004] Patent No. CN221033271U: This invention patent describes an impeller, a centrifugal fan and an oil fume suction and exhaust device, wherein an air flow channel is formed between two adjacent blades, and is characterized in that an annular belt is arranged in the air flow channel, and the annular belt is arranged to be inclined uphill along the air outlet direction, and the annular belt divides the air flow channel into a first flow channel and a second flow channel, and the second flow channel is configured to be away from the air inlet end of the centrifugal fan, and the first flow channel is configured to be close to the air inlet end of the centrifugal fan, so as to improve the flow characteristics of the air flow, improve the fan efficiency and reduce noise.

[0005] Patent No. CN216895037U: This patent involves an impeller, a centrifugal fan, and an oil fume suction and exhaust device. The blades are formed by bending sheet metal to form a hollow structure with an airfoil-shaped cross section. The thicker end of the airfoil is the air inlet end, and the other end is the air outlet end. The cross section of the blade is an airfoil, which can reduce the flow separation of the airflow on the surface of the blade, with low noise and high energy efficiency. The airfoil-shaped impeller is bent and formed by sheet metal material, which is convenient to form. In addition, the impeller has high structural strength and good fire and temperature resistance, so it can be used in more working environments. Centrifugal fans and oil fume suction and exhaust equipment, by setting the above-mentioned impeller, have low noise and high energy efficiency.

[0006] Patent No. CN117703825A: This patent application relates to an impeller for a double-inlet centrifugal fan, a centrifugal fan and a fume suction and exhaust device. The impeller includes: a first disc and a rear disc; blades distributed circumferentially between the first disc and the rear disc, each blade having a first end for connecting to the first disc and a second end for connecting to the rear disc, and each blade also having a leading edge corresponding to the air inlet side and a trailing edge corresponding to the air outlet side; a middle disc, located between the first disc and the rear disc and connected to each blade; each blade is divided into a front blade segment adjacent to the first disc and a rear blade segment adjacent to the rear disc by the position of the middle disc, the front blade segment is inclined toward the side where the trailing edge of the blade is located from the position of the middle disc of the blade to the position of the first disc, and the rear blade segment is inclined toward the side where the trailing edge of the blade is located from the position of the middle disc of the blade to the position of the rear disc. The advantages are: it can effectively improve the flow conditions of the front and rear discs of the impeller, reduce flow separation, and give full play to the work capacity of the middle disc area of ​​the impeller.

[0007] These aforementioned patents attempt to optimize the airflow guidance and acceleration process by changing the shape and angle of the blades, etc. However, these improvements often only focus on the local performance of the impeller, while ignoring the coordination and comprehensive performance of the overall fan system, thereby limiting the overall air performance improvement effect. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide a two-stage fan impeller with better air performance and higher total pressure efficiency, a fan system and oil fume suction and exhaust equipment with the fan system.

[0009] The technical solution adopted by the present invention to solve the above technical problems is: an integrated two-stage full-pressure efficiency-enhancing fan system, comprising a motor, an impeller and a volute; both sides of the volute are provided with air inlets; the impeller comprises a wheel frame and a blade assembly; the motor comprises a motor body and an output shaft, the motor body is arranged on one side of the wheel frame and fixed to the volute, and the wheel frame is connected to the output shaft;

[0010] The wheel frame comprises a front ring, a middle plate and a rear ring in sequence, the middle plate is provided with a central connecting body, the central connecting body is inclined from the outer circumference to the center in a direction away from the rear ring, so as to form a convex part on the front side and a concave part on the rear side; the motor body is located in the concave part, and the output shaft passes through the central connecting body and is fixedly connected;

[0011] The blade assembly includes a primary blade group and a secondary blade group integrated on the same wheel frame, the primary blade group and the secondary blade group each include a plurality of blades distributed at circumferential intervals and present an annular structure, and the primary blade group and the secondary blade group are coaxial with each other;

[0012] The primary blades of the primary blade group pass through the central connector and are located in the front and rear working areas of the impeller; the secondary blades of the secondary blade group are connected between the front ring and the rear ring and pass through the middle disk; all the primary blades have the same rotation direction, all the secondary blades have the same rotation direction, and the rotation direction of the primary blades is opposite to that of the secondary blades.

[0013] The preferred technical solution adopted by the present invention to solve the above technical problems is: the first-level blades are evenly distributed along the circumference of the wheel frame, and the second-level blades are evenly distributed along the circumference of the wheel frame; the channel spacing of the first-level airflow channel is equal in diameter or gradually increases from the inside to the outside.

[0014] The preferred technical solution adopted by the present invention to solve the above technical problem is: the first-stage blade is provided with at least an inner end connecting piece and an outer end connecting piece near the central connecting body;

[0015] The inner end connecting piece is close to the first air inlet end of the primary air flow channel, and the outer end connecting piece is close to the first air outlet end of the primary air flow channel;

[0016] The central connecting body is provided with a through hole. After the primary blade passes through the through hole, the inner connecting piece and the outer connecting piece are both in close contact with the surface of the central connecting body and are fixed by welding.

[0017] The preferred technical solution adopted by the present invention to solve the above technical problem is: the extension line of each of the primary airflow channels passes through a plurality of the secondary airflow channels;

[0018] The angle between the tangent direction of the first air outlet end of the first-stage blade and the tangent direction of the second air inlet end of the second-stage blade is 95-130°.

[0019] The technical solution adopted by the present invention to solve the above technical problem is: the end surface of the first-stage blade located in the front working area of ​​the impeller is located at the same height to be parallel to the front ring;

[0020] The height of the primary blade group located in the working area on the front side of the impeller is greater than or equal to one half of the height of the secondary blade group located on the front side of the impeller, and is less than the height of the secondary blade group located on the front side of the impeller.

[0021] The preferred technical solution adopted by the present invention to solve the above technical problem is that the end surface of the first-stage blade located in the rear working area of ​​the impeller is gradually inclined away from the rear ring from the center to the periphery.

[0022] The technical solution adopted by the present invention to solve the above technical problems is: an integrated two-stage full-pressure efficiency-enhancing fan system, including a motor, an impeller and a volute; the impeller includes a wheel frame and a blade assembly; the wheel frame includes a support ring and a fixed disk, the fixed disk is provided with a central connecting body, the motor body of the motor is fixed to the volute, and the output shaft of the motor passes through the central connecting body and is fixedly connected;

[0023] The blade assembly is integrated with a primary blade group and a secondary blade group on the same wheel frame, and the primary blade group and the secondary blade group each include a plurality of blades distributed at circumferential intervals and are in an annular structure;

[0024] The primary blade group is arranged on the side of the central connecting body facing the support ring; the secondary blade group is arranged between the support ring and the fixed disk and is located at the periphery of the central connecting body; the primary blade group and the secondary blade group are coaxial with each other;

[0025] All the primary blades have the same rotation direction, all the secondary blades have the same rotation direction, and the rotation direction of the primary blades is opposite to that of the secondary blades.

[0026] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is: the first-level blades are evenly distributed along the circumference of the wheel frame, the second-level blades are evenly distributed along the circumference of the wheel frame, a first-level airflow channel is formed between two adjacent first-level blades; a second-level airflow channel is formed between two adjacent second-level blades; the minimum channel spacing of the first-level airflow channel is greater than the maximum channel spacing of the first-level airflow channel.

[0027] The preferred technical solution adopted by the present invention to solve the above technical problems is: the channel spacing of the primary airflow channel is equal in diameter or gradually increases from the inside to the outside, and the channel spacing of the secondary airflow channel gradually decreases from the inside to the outside;

[0028] The angle between the tangent direction of the first air outlet end of the first-stage blade and the tangent direction of the second air inlet end of the second-stage blade is 95-130°;

[0029] The end surface of the primary blade is gradually inclined away from the fixed disk from the center to the periphery; or the end surface of the primary blade is located at the same height to be parallel to the support ring.

[0030] The technical solution adopted by the present invention to solve the above technical problems is: the oil fume suction and exhaust equipment comprises an equipment body with an air duct and the integrated two-stage full-pressure efficiency-enhancing fan system; the integrated two-stage full-pressure efficiency-enhancing fan system is arranged in the air duct;

[0031] The oil smoke enters vertically from the air inlet of the volute into the working area inside the impeller, and after working once by the primary blade group, it enters horizontally into the secondary blade group for secondary work, and then flows out from the air outlet end of the secondary blade group into the interior of the volute.

[0032] Compared with the prior art, the advantages of the present invention are:

[0033] First: The first-level blade group performs the first-level work, so that the airflow speed is significantly increased in a short time, and then enters the second-level blade group at a higher wind speed to perform secondary work, thereby increasing the static pressure energy of the fan system, and making the airflow turn from axial to radial in advance, reducing energy loss, making the airflow more uniform, ensuring the effectiveness of the work of the second-level blades, improving the total pressure efficiency of the fan system, and optimizing the air performance of the fan system.

[0034] Second: The rotation direction of the first-level blades is opposite to that of the second-level blades. The airflow after doing work once flows out of the first-level airflow channel and is "caught" by the second-level airflow channel, reducing the turbulence and escape of the airflow, allowing more airflow to enter the working area of ​​the second-level blade group smoothly and efficiently, thereby improving the boost effect of the fan system.

[0035] Third: Through the work done by the first-stage blade group, the height of the airflow is increased, so that the outer part of the blade away from the center disk is also used more efficiently, thereby greatly improving the total pressure efficiency.

[0036] Fourth: Through two-stage efficiency enhancement, the air performance of the fan of the same size is improved. Under the same power requirement, the manufacturer can reduce the size of the fan, thereby reducing production costs, saving resources, and achieving industrial economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematically representing the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0038] Figure 1 A schematic diagram of an integrated two-stage full-pressure efficiency-enhancing fan system according to a preferred embodiment Figure 1 ;

[0039] Figure 2 A schematic diagram of an integrated two-stage full-pressure efficiency-enhancing fan system according to a preferred embodiment Figure 2 ;

[0040] Figure 3 A schematic diagram of the combination of an impeller and a motor in a preferred embodiment Figure 1 ;

[0041] Figure 4 A schematic diagram of the combination of an impeller and a motor in a preferred embodiment Figure 2 ;

[0042] Figure 5 is a schematic diagram of a motor of a preferred embodiment;

[0043] Figure 6 A schematic diagram of an impeller of a preferred embodiment Figure 1 ;

[0044] Figure 7 A schematic diagram of an impeller of a preferred embodiment Figure 2 ;

[0045] Figure 8 The decomposition of the impeller of a preferred embodiment Figure 1 ;

[0046] Fig. 9 The decomposition of the impeller of a preferred embodiment Figure 2 ;

[0047] Fig.10 An exploded view of an impeller of a preferred embodiment;

[0048] Fig.11 A schematic diagram of a blade assembly according to a preferred embodiment.

[0049] Figure numerals: motor 1, impeller 2, volute 3, air inlet k, wheel frame 21, motor body 11, output shaft 12, front ring 21a, middle disk 21b, rear ring 21c, central connector d, raised portion e, recessed portion f, primary blade group 22a, secondary blade group 22b, primary blade 221, secondary blade 222, primary air flow channel g, secondary air flow channel h, first air inlet end S1, first air outlet end S2, second air inlet end P1, second air outlet end P2, angle r, inner end connecting piece J, outer end connecting piece K, perforation C. DETAILED DESCRIPTION

[0050] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It will be appreciated by those skilled in the art that these descriptions are only illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0051] It should be noted that like reference numerals denote similar items in the following drawings, and thus, once an item is defined in one drawing, it will not be further defined or explained in the subsequent drawings.

[0052] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or the directions or positional relationships in which the invention product is usually placed when in use, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. "First" and "second" are only for the purpose of making the description easier to understand, without any other directional meaning, and cannot be used as a limitation on the present invention.

[0053] like Figure 1 , 2 As shown, this embodiment discloses an integrated two-stage full-pressure efficiency-enhancing fan system, comprising a motor 1, an impeller 2 and a volute 3. Both sides of the volute 3 are provided with air inlets k.

[0054] like Figure 1-5 As shown, the impeller 2 includes a wheel frame 21 and a blade assembly. The motor 1 includes a motor body 11 and an output shaft 12. The motor body 11 is arranged on one side of the wheel frame 21 and fixed to the volute 3, and the wheel frame 21 is connected to the output shaft 12.

[0055] like Figure 3 , 8 As shown in Figure 10, the wheel frame 21 includes a front ring 21a, a middle plate 21b and a rear ring 21c in sequence. The middle plate 21b is provided with a central connecting body d, which is inclined from the outer periphery to the center in a direction away from the rear ring 21c, thereby forming a convex portion e on the front side and a concave portion f on the rear side. The motor body 11 is located in the concave portion f, and the output shaft 12 passes through the central connecting body d and is fixedly connected.

[0056] In a traditional fan system, the impeller assembly is only distributed in a ring on the outer ring of the wheel frame 21. The airflow comes from the air inlets k on both sides. Most of the airflow first acts on the central connector d. The airflow is hindered by the central connector d and changes direction, and then flows out from the airflow channel of the impeller assembly to the outer ring.

[0057] In this embodiment, if Figure 3-4 As shown in FIG. 10 , the blade assembly includes a primary blade group 22a and a secondary blade group 22b integrated on the same wheel frame 21. The primary blade group 22a and the secondary blade group 22b each include a plurality of circumferentially spaced blades to form an annular structure. The primary blade group 22a and the secondary blade group 22b are coaxial with each other.

[0058] like Figure 6-7As shown, the primary blades 221 of the primary blade group 22a pass through the central connector d and are located in the front and rear working areas of the impeller 2. The secondary blades 222 of the secondary blade group 22b are connected between the front ring 21a and the rear ring 21c and pass through the middle disk 21b. All primary blades 221 have the same rotation direction, all secondary blades 222 have the same rotation direction, and the rotation direction of the primary blades 221 is opposite to that of the secondary blades 222. A primary airflow channel g is formed between two adjacent primary blades 221. A secondary airflow channel h is formed between two adjacent secondary blades 222.

[0059] The following advantages are obtained by integrally arranging the coaxial primary blade group 22a subdivision on the central connecting body d. The following advantages are listed in parallel for the sake of convenience, but in fact, they complement each other:

[0060] First: When the impeller 2 rotates, the first-stage blade group 22a can effectively capture air and apply thrust through the windward surface of the blades, perform first-stage work, and significantly increase the air flow speed in a short time, laying the foundation for subsequent further acceleration.

[0061] Second: Under the work of the primary blade group 22a, as the gas moves along the blade path, its speed gradually increases. In this process, the kinetic energy of the gas increases, and at the same time, due to the obstruction of the blades and the effect of centrifugal force, the pressure of the gas also gradually increases. Therefore, before the airflow enters the secondary blade group 22b, its kinetic energy and potential energy are significantly improved, and then the kinetic energy is converted into static pressure energy in the expansion channel, which further increases the gas pressure. Finally, the gas with higher static pressure energy is discharged through the air outlet of the fan. This increase in static pressure energy is crucial to improving the total pressure efficiency of the fan system, because it can provide a stronger driving force for the airflow while maintaining a high flow rate, allowing it to pass through subsequent pipes and devices more efficiently.

[0062] Third: The design of the primary blade group 22a also fully considers the advance change of the airflow direction. In aerodynamics, the reasonable control of the airflow direction is one of the key factors in optimizing the performance of the fan. The primary blade group 22a can guide the direction of the airflow at an early stage after it enters the impeller 2, so that it is converted from axial to horizontal, and can enter the airflow channel of the secondary blade group 22b more efficiently, so that the airflow will not directly impact the central connector d, reducing the energy loss caused by the impact.

[0063] Fourth: In this embodiment, the rotation direction of the primary blade 221 is opposite to that of the secondary blade 222. When the airflow passes through the primary blade group 22a, its rotation direction determines the initial flow direction of the airflow. Subsequently, the airflow encounters the secondary blade group 22b with the opposite rotation direction. This change in rotation direction effectively "holds" the airflow, reduces the turbulence and escape of the airflow, and enables more airflow to smoothly and efficiently enter the working area of ​​the secondary blade group 22b. The design with opposite rotation directions causes the airflow to undergo two changes in direction during the two working processes. This change helps to enhance the kinetic energy and potential energy of the airflow, thereby improving the boosting effect of the fan system. The kinetic energy obtained by the airflow after the first work is further converted and enhanced under the reverse rotation of the secondary blade group 22b, achieving a significant improvement in the total pressure efficiency.

[0064] Fifth: The primary blade group 22a also effectively improves the uniformity of the airflow. In the conventional technology, after the airflow enters the impeller 2, it is impacted by different positions of the central connector d, which will form turbulence and eddies, making the airflow uneven in the circumferential direction of the impeller 2. The primary blade group 22a not only avoids the irregular loss and turning caused by the airflow first colliding with the central connector d, but also can stir the internal airflow evenly through centrifugal force, so that the airflow can be evenly distributed when it flows through the secondary blade group 22b, thereby improving the stability of the airflow.

[0065] Sixth, it is worth noting that in the original structure, since the axial airflow is blocked by the central connector d and then turns to enter the blades laterally, the utilization rate of the outer portion of the blade away from the middle disk 21b is low, so the work efficiency is also affected. In this embodiment, through the work of the first-stage blade group 22a, the height of the airflow is increased, so that the outer portion of the blade away from the middle disk 21b is also more efficiently utilized, thereby greatly improving the total pressure efficiency.

[0066] In summary, through two-stage efficiency enhancement, the air performance of fans of the same size is improved. Under the same power requirement, manufacturers can reduce the size of fans, thereby reducing production costs, saving resources, and achieving industrial economic benefits.

[0067] It should be particularly pointed out that in the present embodiment, the primary blades 221 pass through the central connector d and are located in the front and rear working areas of the impeller 2. This enables the air performance to be enhanced on both the front and rear sides. Moreover, this threading method is integrated on the wheel frame 21 and does not occupy additional space. Since the primary blades 221 and the secondary blades 222 are integrated on the same wheel frame 21, the installation and maintenance of the entire fan system become more convenient. During installation, it is only necessary to connect the wheel frame 21 to the motor 1, the volute 3 and other components. During maintenance, it is only necessary to inspect and replace the wheel frame 21 and the blade assembly thereon, without having to handle each stage of blades 221 individually, thereby saving time and effort.

[0068] Preferably, if Figure 6 , 11 As shown, the first-stage blades 221 are evenly distributed along the circumference of the wheel frame 21, and the second-stage blades 222 are evenly distributed along the circumference of the wheel frame 21. Both the two-stage impellers 2 are evenly distributed along the circumference, so that the airflow is more uniform, the airflow loss caused by airflow turbulence and other reasons is reduced, and the air performance of the fan is improved.

[0069] Preferably, if Figure 6 , 11 As shown, the number of primary blades 221 is less than that of secondary blades 222, and the minimum channel spacing of the primary airflow channel g is greater than the maximum channel spacing of the secondary airflow channel h.

[0070] Furthermore, if Fig.11 As shown, the channel spacing of the primary airflow channel g is equal in diameter or gradually expands from the first air inlet end S1 to the first air outlet end S2. The channel spacing of the secondary airflow channel h gradually decreases from the second air inlet end P1 to the second air outlet end P2 to achieve pressurization.

[0071] like Fig.11 As shown, the channel spacing of the primary airflow channel g gradually expands from the inside to the outside, and the airflow can be captured more tightly by the blades, reducing the possibility of airflow escape, improving the capture efficiency of the airflow, and helping to accelerate the airflow when it enters the impeller 2. Moreover, the smaller blade spacing at the air inlet end can reduce the resistance of the airflow, making it easier to accelerate the airflow, thereby improving the efficiency of the fan and helping to reduce the impact loss of the airflow when it enters the impeller 2. In addition, when the airflow passes through the initially smaller blade spacing, its velocity distribution is more uniform, reducing the loss caused by the sudden change in velocity. As the airflow moves from the air inlet end to the air outlet end, the gradual increase in the blade spacing helps to form an appropriate pressure gradient. This gradient can drive the airflow to continue to accelerate, while increasing its pressure energy, providing greater power for the final output of the airflow.

[0072] like Figure 6-11 As shown, preferably, the extension line of each primary airflow channel g passes through multiple secondary airflow channels h. The angle r between the tangent direction of the first air outlet end S2 of the primary blade 221 and the tangent direction of the second air inlet end P1 of the secondary blade 222 is 95-130°. This angle prevents the outlet airflow of the primary airflow channel g from directly impacting the secondary blade 222, but can be caught by the secondary blade 222, which is the preferred value for improving air performance.

[0073] like Figure 6 , 7As shown, preferably, the primary blade 221 is provided with at least an inner connecting piece J and an outer connecting piece K near the central connecting body d. The inner connecting piece J is close to the first air inlet end S1 of the primary air flow channel g, and the outer connecting piece K is close to the first air outlet end S2 of the primary air flow channel g. A through hole C is provided on the central connecting body d. After the primary blade 221 passes through the through hole C, the inner connecting piece J and the outer connecting piece K are both in close contact with the surface of the central connecting body d and the two are fixed by welding.

[0074] Through the restriction of the perforation C, the primary blade 221 is limited in a direction perpendicular to the axial direction, so that fixation in one direction is achieved. Then, the axial fixation is further achieved through the connecting plate. By respectively arranging the design of being close to the central connecting body d at the inner end connecting plate J and the outer end connecting plate K, and fixing them by welding, the connection strength between the blade and the wheel frame 21 is significantly enhanced. The connection method between the inner and outer ends makes the force on a blade more uniform, which is more conducive to the stability of the connection. In summary, this multiple connection structure ensures that the blades will not loosen or fall off under high speed and high load operating conditions, thereby greatly improving the overall stability and reliability of the fan system.

[0075] Preferably, if Figure 6 As shown, the end faces of the first-stage blades 221 located in the front working area of ​​the impeller 2 are located at the same height to be parallel to the front ring 21a. The uniform height of the end faces of the first-stage blades 221 simplifies the manufacturing and assembly process of the blades, improves production efficiency and assembly consistency, and also improves the uniformity of the airflow of the impeller 2.

[0076] Further preferably, the height of the primary blade group 22a located in the working area on the front side of the impeller 2 is greater than or equal to one-half of the height of the secondary blade group 22b located on the front side of the impeller 2, and is less than the height of the secondary blade group 22b located on the front side of the impeller 2. The design that the height of the primary blade group 22a is less than the height of the secondary blade group 22b not only avoids the installation problem caused by the primary impeller 2 being out of range, but also avoids the overflow of the airflow of one working operation, and is more helpful to improve the transition continuity of the airflow from the primary blade 221 to the secondary blade 222. This continuity ensures the smooth transmission of the airflow inside the impeller 2, and reduces the interruption and backflow of the airflow. The height of the primary blade group 22a is set to be greater than or equal to one-half of the height of the secondary blade group 22b, which further increases the working area, can more effectively accelerate the airflow, and improve the airflow, so that the utilization rate of the entire blade section of the secondary blade group 22b is improved. By optimizing the layout and height of the primary blade 221 in the front working area, the aerodynamic performance of the entire fan system is significantly improved. This design not only enhances the full pressure capacity of the fan, but also promotes the smooth flow of air in the entire fan system, reducing energy loss. Therefore, this technical solution not only improves the overall performance of the fan system, but also effectively improves the energy efficiency ratio, making the oil fume suction and exhaust equipment more energy-efficient and efficient during operation.

[0077] like Figure 7 As shown, the end face of the first-stage blade 221 located in the working area on the rear side of the impeller 2 is gradually inclined away from the rear ring 21c from the center to the periphery. The inclined design of the blade end face allows a larger blade surface area to be achieved in a limited space, thereby maximizing the contact area and working effect of the airflow without interfering with the installation of the motor 1, and achieving axial lift of the airflow.

[0078] It should be recognized that this embodiment discloses a fan system with two-way air intake. Of course, this system can also be used in a fan system with one-way air intake.

[0079] The wheel frame 21 of this integrated two-stage full-pressure efficiency-enhancing fan system only includes one ring and one disk, that is, there are no front and rear working areas. Specifically, the wheel frame 21 includes a support ring (equivalent to one of the front ring 21a or the rear ring 21c) and a fixed disk, and the fixed disk is provided with a central connecting body d. The primary blade group 22a is arranged on the side of the central connecting body d facing the support ring; the secondary blade group 22b is arranged between the support ring and the fixed disk and is located on the periphery of the central connecting body d; the primary blade group 22a and the secondary blade group 22b are coaxial with each other. In this structure, the above-mentioned preferred scheme can also be cited.

[0080] The above-mentioned integrated two-stage full-pressure efficiency-enhancing fan system is mainly used in oil fume removal equipment such as oil fume suction and exhaust equipment, which includes an equipment body with an air duct and the above-mentioned integrated two-stage full-pressure efficiency-enhancing fan system; the integrated two-stage full-pressure efficiency-enhancing fan system is arranged in the air duct; the oil fume enters vertically from the air inlet k of the volute 3 into the working area of ​​the impeller 2 located between the support ring and the fixed disk, and after the first-stage blade group 22a performs a first work, it enters horizontally into the second-stage blade group 22b for a second work, and then flows out from the air outlet end of the second-stage blade group 22b into the inside of the volute 3. After the efficiency enhancement of the first-stage blade group 22a and the increase in air flow velocity, the grease separation degree of the entire system can also be increased, which is conducive to meeting environmental protection requirements.

[0081] An integrated two-stage full-pressure booster fan system and oil fume suction and exhaust equipment provided by the present invention are introduced. Specific examples are used in this article to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the present invention and its core ideas. It should be pointed out that for ordinary technicians in this technical field, the present invention can also be improved and modified without departing from the principle of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An integrated two-stage full-pressure efficiency-enhancing fan system, comprising a motor, an impeller and a volute; both sides of the volute are provided with air inlets; the impeller comprises a wheel frame and a blade assembly; the motor comprises a motor body and an output shaft, the motor body is arranged on one side of the wheel frame and fixed to the volute, and the wheel frame is connected to the output shaft; The wheel frame comprises a front ring, a middle plate and a rear ring in sequence, the middle plate is provided with a central connecting body, the central connecting body is inclined from the outer circumference to the center in a direction away from the rear ring, so as to form a convex part on the front side and a concave part on the rear side; the motor body is located in the concave part, and the output shaft passes through the central connecting body and is fixedly connected; Features: The blade assembly includes a primary blade group and a secondary blade group integrated on the same wheel frame, the primary blade group and the secondary blade group each include a plurality of blades distributed at circumferential intervals and present an annular structure, and the primary blade group and the secondary blade group are coaxial with each other; The first-stage blades of the first-stage blade group pass through the central connecting body and are located in the front and rear working areas of the impeller; The secondary blades of the secondary blade group are connected between the front ring and the rear ring and pass through the middle disk; All the primary blades have the same rotation direction, all the secondary blades have the same rotation direction, and the rotation direction of the primary blades is opposite to that of the secondary blades.

2. The integrated two-stage full-pressure efficiency-enhancing blower system according to claim 1 is characterized in that: The first-level blades are evenly distributed along the circumference of the wheel frame, and the second-level blades are evenly distributed along the circumference of the wheel frame; the channel spacing of the first-level airflow channel gradually increases from the inside to the outside.

3. The integrated two-stage full-pressure efficiency-enhancing blower system according to claim 1 is characterized in that: The first-stage blade is provided with at least an inner end connecting piece and an outer end connecting piece near the central connecting body; The inner end connecting piece is close to the first air inlet end of the primary air flow channel, and the outer end connecting piece is close to the first air outlet end of the primary air flow channel; The central connecting body is provided with a through hole. After the primary blade passes through the through hole, the inner connecting piece and the outer connecting piece are both in close contact with the surface of the central connecting body and are fixed by welding.

4. The integrated two-stage full-pressure efficiency-enhancing blower system according to claim 1 is characterized in that: An extension line of each of the primary airflow channels passes through a plurality of the secondary airflow channels; The angle between the tangent direction of the first air outlet end of the first-stage blade and the tangent direction of the second air inlet end of the second-stage blade is 95-130°.

5. The integrated two-stage full-pressure efficiency-enhancing blower system according to claim 1 is characterized in that: The end surfaces of the first-stage blades located in the front working area of ​​the impeller are located at the same height so as to be parallel to the front ring; The height of the primary blade group located in the working area on the front side of the impeller is greater than or equal to one half of the height of the secondary blade group located on the front side of the impeller, and is less than the height of the secondary blade group located on the front side of the impeller.

6. The integrated two-stage full-pressure efficiency-enhancing blower system according to claim 1 is characterized in that: The end surface of the first-stage blade located in the working area at the rear side of the impeller is gradually inclined away from the rear ring from the center to the periphery.

7. An integrated two-stage full-pressure efficiency-enhancing fan system, comprising a motor, an impeller and a volute; the impeller comprises a wheel frame and a blade assembly; the wheel frame comprises a support ring and a fixing plate, the fixing plate is provided with a central connecting body, the motor body of the motor is fixed to the volute, and the output shaft of the motor passes through the central connecting body and is fixedly connected; Features: The blade assembly is integrated with a primary blade group and a secondary blade group on the same wheel frame, and the primary blade group and the secondary blade group each include a plurality of blades distributed at circumferential intervals and are in an annular structure; The primary blade group is arranged on the side of the central connecting body facing the support ring; the secondary blade group is arranged between the support ring and the fixed disk and is located at the periphery of the central connecting body; the primary blade group and the secondary blade group are coaxial with each other; All the primary blades have the same rotation direction, all the secondary blades have the same rotation direction, and the rotation direction of the primary blades is opposite to that of the secondary blades.

8. The integrated two-stage full-pressure efficiency-enhancing blower system according to claim 7 is characterized in that: The primary blades are evenly distributed along the circumference of the wheel frame, and the secondary blades are evenly distributed along the circumference of the wheel frame. A primary airflow channel is formed between two adjacent primary blades; a secondary airflow channel is formed between two adjacent secondary blades; and the minimum channel spacing of the primary airflow channel is greater than the maximum channel spacing of the secondary airflow channel.

9. The integrated two-stage full-pressure efficiency-enhancing blower system according to claim 8, characterized in that: The channel spacing of the primary airflow channel is of equal diameter or gradually increases from the inside to the outside, and the channel spacing of the secondary airflow channel gradually decreases from the inside to the outside; The angle between the tangent direction of the first air outlet end of the first-stage blade and the tangent direction of the second air inlet end of the second-stage blade is 95-130°; The end surface of the primary blade is gradually inclined away from the fixed disk from the center to the periphery; or the end surface of the primary blade is located at the same height to be parallel to the support ring.

10. Oil fume suction and exhaust equipment, characterized in that: It comprises a device body having an air duct and an integrated two-stage full-pressure efficiency-enhancing fan system as described in any one of claims 1 to 9; the integrated two-stage full-pressure efficiency-enhancing fan system is arranged in the air duct; The oil smoke enters vertically from the air inlet of the volute into the working area inside the impeller, and after working once by the primary blade group, it enters horizontally into the secondary blade group for secondary work, and then flows out from the air outlet end of the secondary blade group into the interior of the volute.

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