Small dust collector-specific high-speed centrifugal fan

Abstract

The present invention relates to the technical field of centrifugal fans, and in particular to a small dust collector-specific high-speed centrifugal fan, comprising a centrifugal fan body which is mounted on a dust collector, and further comprising an air control assembly, an air inlet pipe, and a casing. A support framework is mounted inside the air inlet pipe, a detection rod is mounted at the connection center of the support framework, a detection element is mounted inside the detection rod, and the air control assembly for regulating the flow rate of an air inlet is mounted outside the air inlet pipe. In the present invention, an air control assembly is provided, and by means of a driving motor, the air control assembly drives a rotating circular ring to carry out rotary motion, and then the rotating circular ring pulls multiple air-blocking laminations to carry out spiral convergence motion, so that the retraction and extension motion of the air control assembly solves the problem that the air speed of a high-speed centrifugal fan is extremely fast or exceeds the limit during long-time or high-speed operation of the high-speed centrifugal fan.

Description

A high-speed centrifugal fan specially designed for small dust collectors Technical Field

[0001] The present invention relates to the technical field of centrifugal fans, and in particular to a high-speed centrifugal fan dedicated to a small dust collector. Background Art

[0002] Small dust collectors play an important role in removing dust, particulate matter and pollutants in small spaces such as homes, offices and industrial equipment dust removal. In order to effectively achieve the dust removal function, high-speed centrifugal fans have become a common choice; high-speed centrifugal fans are an important airflow conveying device widely used in various industrial and civil applications. Their working principle is based on the principle of centrifugal force. By introducing gas or air particles into the center of the fan, and then using the rotating blades to generate centrifugal force, the gas or particles are quickly discharged, so that the generated high-speed airflow has a higher wind pressure and air volume.

[0003] Existing methods for adjusting fan speed include adjusting motor frequency, installing a control system, and adjusting the transmission unit. Since the installation space for high-speed centrifugal fans in small dust collectors is relatively small, adjusting the motor frequency will affect the operating efficiency of the centrifugal fan and will also place higher requirements on the motor. For small dust collectors, introducing an expensive control system makes the fan cost unreasonable. Similarly, adjusting the transmission unit will also affect the operating efficiency of the fan and affect the fan's stability.

[0004] Compared with the small size and light weight of the dust collector equipment, the high speed of the high-speed centrifugal fan will form a large negative pressure near the air inlet of the high-speed centrifugal fan over a long period of use, which will cause the internal wind speed of the high-speed centrifugal fan to be too fast, and then cause the speed of the high-speed centrifugal fan to be too fast, thereby causing damage to the high-speed centrifugal fan.

[0005] In view of the above situation, in order to overcome the above technical problems, the present invention designs a high-speed centrifugal fan specially used for a small dust collector, which solves the above technical problems. Summary of the Invention

[0006] The technical problem to be solved by the present invention is: in the compact internal installation space of a small dust collector, when the high-speed centrifugal fan runs for a long time or at high speed, a large wind speed and negative pressure are formed at the air inlet, which leads to the high-speed centrifugal fan having an excessively fast speed. For a long time, it will cause a large torque to the drive motor of the high-speed centrifugal fan, thereby causing the wind speed of the high-speed centrifugal fan to be too fast or exceed the limit.

[0007] In order to solve the above problems, the present invention provides the following technical solutions:

[0008] The present invention provides a high-speed centrifugal fan specially designed for a small dust collector, comprising a centrifugal fan body, which is installed on the dust collector, and also comprising an air control component and an air inlet duct, the air inlet duct being installed at the air inlet of the centrifugal fan, a support frame being installed inside the air inlet duct, a detection rod for detecting the wind speed and pressure at the air inlet being installed at the connection center of the support frame, a detection element for transmitting a control signal being installed inside the detection rod, and an air control component for adjusting the flow rate at the air inlet being installed outside the air inlet duct, the detection element controlling the forward and reverse rotation of the air control component by emitting a control signal, thereby controlling the air volume at the air inlet duct.

[0009] According to the above, the centrifugal fan body is installed on the dust collector, the air inlet duct is installed at the air inlet of the centrifugal fan, and the air inlet duct is connected to the air suction duct of the dust collector; a support frame is installed inside the air inlet duct, and the support frame is used to support the inner wall of the air inlet duct. Since the air inlet duct is divided into two sections, front and back, by the wind control component, the support frame fixedly connects the front and back sections of the air inlet duct by connecting the front and back; a detection rod for detecting the wind speed and pressure at the air inlet is installed at the connection center of the support frame, and the detection rod not only connects the front and back support frames, but also detects the wind speed inside the air inlet duct; a detection element for transmitting a control signal is installed inside the detection rod, and the key component for realizing wind speed detection on the detection rod is the detection element, and the detection element measures the wind speed by using the expansion and contraction amount of the induction spring;

[0010] At the same time, a wind control component for adjusting the flow rate of the air inlet is installed on the outside of the air inlet duct. The wind control component rotates through multiple internal wind-blocking laminates to form a closed partition that blocks the air inlet duct; the detection element controls the forward and reverse rotation of the wind control component by emitting a control signal, thereby controlling the air volume at the air inlet duct. The hood is installed on the outside of the wind control component, and the hood is used to provide support and protection for the wind control component.

[0011] The wind control assembly includes a fixed swivel, windshield laminates, a rotating ring, a tightening pressure ring, a fan gear, a transmission gear, a drive motor and a hood. The inner end of the fixed swivel is fixedly mounted on the outer surface of the air inlet duct, and one end of the windshield laminate is hinged to the inner end face of the fixed swivel. The outer surface of the air inlet duct is also rotatably mounted with a rotating ring for driving the windshield laminates to rotate. The end face of the rotating ring is provided with a guide groove for limiting the expansion and closing range of the windshield laminates. The tightening pressure ring is rotatably mounted on the outer end face of the fixed swivel, and a connecting pressure head is installed on the surface array of the tightening pressure ring. The root of the connecting pressure head is fixedly mounted on the outer end face of the rotating ring. The tightening pressure ring makes the gap connection between the windshield laminates more compact through the fixed connection action of the connecting pressure head, thereby providing airtightness for the expansion and contraction of the windshield laminates. The fan gear is fixedly connected to the inner end face of the rotating ring, and the hood is mounted on the centrifugal fan body.

[0012] Based on the above, the guide slide is the key feature that drives the windshield laminates to open and close inward and outward. The stroke of the guide slide determines the opening and closing amplitude of the windshield laminates. Since the guide slide and the sliding bosses on the windshield laminates slide against each other, this means that there will be greater wear between the two. Therefore, in order to extend the service life of the guide slide, a tungsten coating is plated on the sliding inner side of the guide slide; the tightening pressure ring should ensure that the gap between the windshield laminates is small enough while ensuring that the friction between the windshield laminates is relatively small.

[0013] The windshield laminate is a sheet metal bending part. The lower end face of one end of the windshield laminate is equipped with a hinged boss for hingedly connecting the windshield laminate to a fixed swivel. The upper end face of the other end of the windshield laminate is equipped with a sliding boss for sliding the windshield laminate in a guide groove. The sliding boss drives the hinged boss to rotate by sliding linearly in the guide groove, and then the windshield laminate performs a contraction and expansion movement inside the air inlet duct.

[0014] The windshield laminate is installed in a stacked sliding manner through a bending angle. The cross section of the windshield laminate is arc-shaped. The arc-shaped outer sides of the windshield laminate are spirally assembled and installed, thereby forming a closed and unfolded partition surface.

[0015] The sliding boss is driven by the rotating ring, and then the sliding boss will rotate with the rotating ring. At the same time, the sliding boss will slide linearly in the guide groove, and the windshield laminate will rotate around the hinged boss on the fixed rotating ring; in order to increase the service life of the windshield laminate, the surface of the windshield laminate is also coated. It is worth noting that the sliding boss on the windshield laminate should be vertically parallel to the hinged boss, and the bending angle of the windshield laminate should be adjusted according to the number of windshield laminates. The more windshield laminates there are, the higher the stacking thickness, that is, the bending angle of the windshield laminate also needs to be increased.

[0016] A rolling circular groove for installing rolling steel balls is provided inside the tightening pressure ring, and a rolling circular groove is provided on the outer end surface of the fixed rotating ring. The rolling steel balls roll inside the rolling circular groove, so that the tightening pressure ring provides axial compression force while the rotating ring drives the windshield stack to rotate in the direction of the cutting axis.

[0017] The tooth top radius of the sector gear is the same as the radius of the rotating ring. The effective meshing teeth of the sector gear correspond to the sliding stroke of the guide slot, and the sector gear limits the opening and closing range of the windshield laminations.

[0018] According to the above, the effective meshing teeth on the sector gear are intended to limit the over-meshing of the transmission gear, which in turn causes the sliding boss to squeeze and interfere with the guide slot, thereby causing damage to the parts.

[0019] The inside of the detection rod is a detection element, and detection sliding cavities are fixedly installed on both sides of the detection element. In the detection sliding cavity, a sensing slide for sensing the wind speed in the air inlet duct is slidably installed. The sensing slide and the detection element are connected by an induction spring; the outer surface of the detection rod is provided with a sensing groove, and the sensing grooves are distributed in a circular array on the outer surface of the detection rod. The detection element uses the Bernoulli phenomenon generated by the rapid passage of air through the sensing grooves inside the air inlet duct to determine the wind speed inside the air inlet duct.

[0020] The detection rod not only has the function of connecting and fixing the air inlet duct, but also has a detection element installed inside it for detecting wind speed. The number of sensing slides corresponds to the number of sensing slots. Two sensing slots are selected, and the sensing slots are symmetrically opened on the outside of the detection rod. It should be noted that the opening position of the sensing slots is staggered with the position of the supporting frame to ensure that the supporting frame does not interfere with the detection element in the sensing slot; the sensing spring is in a relaxed state when it is not subjected to external force, and the sensing spring has damping to overcome the gravity and movement inertia of the sensing slide.

[0021] The outer end of the sensing slide is provided with an arc convex surface, and the inner end of the sensing slide is provided with a bottom flat surface. The arc convex surface is opposite to the sensing slot. The sensing slide slides up and down through the wind speed pressure difference inside and outside the arc "convex" shape, and then the sensing slide pulls the sensing spring to make the detection element measure the wind speed.

[0022] The upper end of the sensing slide is a raised arc shape and the lower end is a flat surface. The sensing slide slides due to the pressure difference between the upper and lower ends. The inner wall of the detection slide cavity is tungsten-coated. At the same time, the contact surface between the sensing slide and the detection slide cavity is coated with lubricating oil. The cross-section of the sensing slide is similar to that of the sensing slot, and the sensing slide is slightly smaller than the sensing slot to ensure that the sensing slide will not slip out of the detection slide cavity.

[0023] The support frame consists of three support frames, which are distributed in a circular array on the surface of the detection rod. At the same time, support frames are installed at the front and rear ends of the detection rod to connect and fix the front and rear sections of the air inlet duct. The front and rear two groups of support frames are installed in a linear array. At the same time, each support frame has a shuttle-shaped fillet on the windward surface to reduce wind resistance.

[0024] The beneficial effects of the present invention are as follows:

[0025] 1. The present invention provides a wind control component, which drives a rotating ring to rotate through a driving motor, and then the rotating ring pulls the multiple wind shielding laminates to perform spiral aggregation movement. The wind shielding laminates will contract and expand the air inlet duct, thereby realizing wind speed control inside the air inlet duct. The contraction and expansion movement of the wind control component solves the problem that when the high-speed centrifugal fan runs for a long time or at high speed, the wind speed of the high-speed centrifugal fan will be too fast, resulting in poor stability of the high-speed centrifugal fan.

[0026] 2. The present invention provides a detection rod inside the air inlet duct, and the detection rod senses the wind speed inside the air inlet duct by opening a sensing groove on the surface. Then, the sensing slide drives the sensing spring to expand and contract under the action of the Bernoulli principle, so that the detection element obtains wind speed information through the spring expansion and contraction detection. The detection element controls the forward and reverse rotation of the drive motor, thereby realizing automatic control of the size of the air inlet diameter of the air inlet duct, and solving the problem of the need to install an additional control system resulting in complex internal structure.

[0027] 3. The present invention installs a tightening pressure ring on the upper end of the fixed swivel, and the upper end of the tightening pressure ring is fixedly connected to the rotating ring through a connecting pressure head. At the same time, the lower end of the tightening pressure ring is rotatably connected to the fixed swivel through a plurality of rolling steel balls. By adjusting the tightness of the connecting pressure head, the gap between the windshield stacking sheets between the fixed swivel and the rotating ring is adjusted, thereby improving the airtightness inside the air inlet duct and making the present invention compact in structure and improving the stability of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] The above and other aspects of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

[0030] FIG1 is a schematic diagram of the main structure of the present invention;

[0031] FIG2 is an overall schematic diagram of the wind control assembly of the present invention;

[0032] FIG3 is a schematic diagram of a windshield laminate according to the present invention;

[0033] FIG4 is a schematic diagram of the installation of the windshield laminate of the present invention;

[0034] FIG5 is a schematic diagram of the inner end of the wind control assembly of the present invention;

[0035] FIG6 is a side view of the wind control assembly of the present invention;

[0036] FIG7 is a cross-sectional view taken along line AA of FIG6 of the present invention;

[0037] FIG8 is a partial enlarged view of point C in FIG7 of the present invention;

[0038] 9 is a schematic diagram of the installation of the sector gear of the present invention;

[0039] FIG10 is a schematic diagram of a detection rod of the present invention;

[0040] FIG11 is a cross-sectional view taken along line BB of FIG10 of the present invention.

[0041] In the figure: 1. Centrifugal fan body; 2. Wind control assembly; 21. Fixed swivel; 22. Wind shield laminations; 221. Articulated boss; 222. Sliding boss; 23. Rotating ring; 231. Guide slide; 24. Tightening pressure ring; 241. Rolling steel ball; 242. Rolling circular groove; 243. Connecting pressure head; 25. Fan gear; 26. Transmission gear; 27. Drive motor; 28. Machine cover; 3. Air inlet duct; 31. Support frame; 311. Shuttle-shaped fillet; 312. Support frame; 32. Detection rod; 321. Detection element; 322. Sensing slot; 323. Sensing spring; 324. Sensing slide; 325. Detection slide cavity. DETAILED DESCRIPTION

[0042] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0043] As shown in Figure 1, the present invention provides a high-speed centrifugal fan dedicated to a small dust collector, including a centrifugal fan body 1, which is installed on the ground, and also includes a wind control component 2 and an air inlet duct 3. The air inlet duct 3 is installed at the air inlet of the centrifugal fan, and a support frame 31 is installed inside the air inlet duct 3. A detection rod 32 for detecting the wind speed and pressure at the air inlet is installed at the connection center of the support frame 31, and a detection element 321 for transmitting a control signal is installed inside the detection rod 32. A wind control component 2 for adjusting the flow rate of the air inlet is installed outside the air inlet duct 3, and the detection element 321 controls the forward and reverse rotation of the wind control component 2 by emitting a control signal, thereby controlling the air volume at the air inlet duct 3.

[0044] The centrifugal fan body 1 is installed on the dust collector, and the air inlet duct 3 is installed at the air inlet of the centrifugal fan, and the air inlet duct 3 is connected to the suction duct of the dust collector; a support frame 31 is installed inside the air inlet duct 3, and the support frame 31 is used to support the inner wall of the air inlet duct 3. Since the air inlet duct 3 is divided into two sections, front and back, by the wind control component 2, the support frame 31 fixes the front and back sections of the air inlet duct 3 by connecting the front and back; a detection rod 32 for detecting the wind speed and pressure of the air inlet is installed at the connection center of the support frame 31. The detection rod 32 not only connects the front and rear support frames 31, but also detects the wind speed inside the air inlet duct 3; a detection element 321 for transmitting a control signal is installed inside the detection rod 32. The key component of the detection rod 32 to realize wind speed detection is the detection element 321. The detection element 321 uses the expansion and contraction amount of the induction spring 323 to measure the wind speed.

[0045] A wind control component 2 for adjusting the flow rate of the air inlet is installed on the outside of the air inlet duct 3. The wind control component 2 is stacked and rotated through multiple wind-shielding laminates 22 inside, thereby forming a closed partition that blocks the air inlet duct 3; the detection element 321 controls the forward and reverse rotation of the wind control component 2 by emitting a control signal, thereby controlling the air volume at the air inlet duct 3, and the hood 4 is installed on the outside of the wind control component 2.

[0046] Working process: The centrifugal fan body 1 is running, and the air inlet duct 3 starts to inhale air, generating wind flow around the detection rod 32. At this time, the detection rod 32 detects the size of the wind speed, and then controls the wind control component 2 to contract and expand the air inlet diameter of the air inlet duct 3. When the detection rod 32 detects that the wind speed is too high, the wind control component 2 will expand the air inlet diameter of the air inlet duct 3, thereby increasing the air intake volume inside the air inlet duct 3, reducing the negative pressure inside the air inlet duct 3, and thus reducing the wind speed.

[0047] As shown in Figures 1, 2 and 7, the wind control assembly 2 includes a fixed swivel 21, windshield laminates 22, a rotating ring 23, a tightening pressure ring 24, a sector gear 25, a transmission gear 26, a drive motor 27 and a hood 28. The inner end of the fixed swivel 21 is fixedly mounted on the outer surface of the air inlet duct 3, and one end of the windshield laminates 22 is hinged to the inner end face of the fixed swivel 21. The outer surface of the air inlet duct 3 is also rotatably mounted with a rotating ring 23 for driving the windshield laminates 22 to rotate. The end face of the rotating ring 23 is provided with a guide slot 231 for limiting the expansion and closing range of the windshield laminates 22. The tightening pressure ring 24 is rotatably mounted on the outer end face of the fixed rotating ring 21, and a connecting pressure head 243 is installed in an array on the surface of the tightening pressure ring 24. The root of the connecting pressure head 243 is fixedly mounted on the outer end face of the rotating ring 23. The tightening pressure ring 24 makes the gap connection between the windshield laminations 22 more compact through the fixed connection action of the connecting pressure head 243, thereby providing airtightness for the contraction and expansion of the windshield laminations 22. The fan gear 25 is fixedly connected to the inner end face of the rotating ring 23, and the hood 28 is installed on the centrifugal fan body 1. The hood 28 is used to provide support and protection for the wind control component 2.

[0048] When the wind control component 2 is working, the drive motor 27 drives the transmission gear 26 to rotate, and then drives the fan gear 25 to rotate forward and reverse under the engagement of the effective meshing teeth. The fan gear 25 will drive the rotating ring 23 to rotate, and then the rotating ring 23 will drive the windshield stack 22 to start rotating around the hinge between the windshield stack 22 and the fixed rotating ring 21. At the same time, the tightening pressure ring 24 is connected to the rotating ring 23 through the connecting pressure head 243, so the tightening pressure ring 24 will rotate at the upper end of the fixed rotating ring 21, thereby achieving the effect of close sliding of the windshield stack 22.

[0049] As shown in Figure 3, the windshield laminate 22 is a sheet metal bending part. The lower end surface of one end of the windshield laminate 22 is installed with a hinged boss 221 for hingedly connecting the windshield laminate 22 to the fixed swivel 21, and the upper end surface of the other end of the windshield laminate 22 is installed with a sliding boss 222 for sliding the windshield laminate 22 in the guide groove 231. The sliding boss 222 drives the hinged boss 221 to rotate by linear sliding in the guide groove 231, and then the windshield laminate 22 performs a contraction and expansion movement inside the air inlet duct 3.

[0050] When the windshield laminate 22 moves, the sliding boss 222 will be driven by the rotating ring 23, and then the sliding boss 222 will rotate along with the rotating ring 23. At the same time, the sliding boss 222 will slide linearly in the guide groove 231, and the windshield laminate 22 will rotate around the hinged boss 221 on the fixed rotating ring 21.

[0051] As shown in FIG4 , the windshield laminate 22 is installed in a stacked sliding manner through a bent angle. The cross section of the windshield laminate 22 is arc-shaped. The arc-shaped outer sides of the windshield laminate 22 are spirally assembled to form a closed and unfolded partition surface.

[0052] Driven by the rotating ring 23, the windshield laminate 22 will not only rotate along the hinged boss 221, but also make a linear motion perpendicular to the axis direction of the rotating ring 23 under the action of the guide groove 231. The multiple windshield laminates 22 are stacked and aggregated through their curved outer side surfaces, and then the multiple windshield laminates 22 form a contraction or expansion of the air inlet duct 3.

[0053] As shown in Figures 5 to 8, a rolling circular groove 242 for installing a rolling steel ball 241 is provided inside the tightening pressure ring 24, and a rolling circular groove 242 is correspondingly provided on the outer end surface of the fixed rotating ring 21. The rolling steel ball 241 rolls inside the rolling circular groove 242 so that the tightening pressure ring 24 provides an axial clamping force while the rotating ring 23 drives the windshield laminate 22 to rotate in the direction of the cutting axis, so that the windshield laminate 22 will form a tight installation surface.

[0054] The tightening pressure ring 24 is a part that connects the fixed swivel 21 and the rotating ring 23. While ensuring the smooth rotation of the rotating ring 23, it also does not make the gap between the fixed swivel 21 and the rotating ring 23 too large. Therefore, the connection between the tightening pressure ring 24 and the fixed swivel 21 adopts a ball bearing type rotating connection method. While the tightening pressure ring 24 provides a clamping force in the axial direction, it does not have a significant impact on the rotational movement of the rotating ring 23.

[0055] As shown in FIG9 , the tooth top radius of the sector gear 25 is the same as the radius of the rotating ring 23 . The effective meshing teeth of the sector gear 25 correspond to the sliding stroke of the guide slot 231 , thereby limiting the opening and closing range of the windshield laminate 22 .

[0056] The sector gear 25 is composed of gears with a smaller module. The sector gear 25 with a smaller module will have a finer meshing stroke. The embodiment of the present invention uses a sector gear 25 with a module of 4. At the same time, the number of teeth of the sector gear 25 is 110 to match the diameter of the rotating ring 23. According to the guide stroke of the guide groove 231 on the rotating ring 23, that is, the rotation angle of the windshield lamination 22, it can be further concluded that in the sector gear 25 with a module of 4, the 110 teeth ultimately have only effective teeth within a range of about 32.2°. Furthermore, this embodiment cuts off the excess ineffective teeth of the sector gear 25, retaining only the area with effective teeth.

[0057] As shown in Figure 11, a detection element 321 for detecting wind speed is installed inside the detection rod 32, and detection sliding cavities 325 are fixedly installed on both sides of the detection element 321. A sensing slide 324 for sensing the wind speed in the air inlet duct 3 is slidably installed in the detection slide 325, and the sensing slide 324 is connected to the detection element 321 through an induction spring 323; the outer surface of the detection rod 32 is provided with a sensing groove 322, and the sensing grooves 322 are distributed in a ring shape on the outer surface of the detection rod 32. The detection element 321 uses the Bernoulli phenomenon generated by the rapid passage of the air in the air inlet duct 3 through the sensing grooves 322 to determine the wind speed inside the air inlet duct 3.

[0058] The detection rod 32 not only has the function of connecting and fixing the air inlet duct 3, but also has a detection element 321 installed inside it for detecting wind speed. The number of the sensing slides corresponds to the number of the sensing slots 322. The number of the sensing slots 322 is two, and the sensing slots 322 are symmetrically opened on the outside of the detection rod 32. It should be noted that the opening position of the sensing slots 322 is staggered with the position of the support frame 31 to ensure that the support frame 31 does not interfere with the detection element 321 in the sensing slots 322; the sensing spring 323 is in a relaxed state when not subjected to external force, and the sensing spring 323 has damping to overcome the gravity and movement inertia of the sensing slide 324.

[0059] As shown in Figure 11, the outer end of the sensing slide 324 is provided with an arc convex surface, and the inner end of the sensing slide 324 is provided with a bottom plane. The arc convex surface is opposite to the sensing groove 322. The sensing slide 324 slides up and down through the wind speed pressure difference inside and outside the arc convex surface, and then the sensing slide 324 pulls the sensing spring 323 so that the detection element 321 measures the wind speed.

[0060] The upper end of the sensing slide 324 is in a raised arc shape and the lower end is flat. The sensing slide 324 slides due to the pressure difference between the upper and lower ends. The inner wall of the detection slide cavity 325 is tungsten-coated, and the contact surface between the sensing slide 324 and the detection slide cavity 325 is coated with lubricating oil. The cross-section of the sensing slide 324 is similar to the cross-section of the sensing slot 322, and the sensing slide 324 is slightly smaller than the sensing slot 322, thereby ensuring that the sensing slide 324 does not slide out of the detection slide cavity 325.

[0061] As shown in Figure 10, the support skeleton 31 is a group of two, and the support skeleton 31 is respectively installed at the two ends of the detection rod 32. The support skeleton 31 is composed of three support frames 312. The support frame 312 has a shuttle-shaped fillet 311 at one end facing the air inlet direction. The support frame 312 reduces the loss of wind speed at the air inlet through the shuttle-shaped fillet 311.

[0062] The support skeleton 31 is composed of three support frames 312, and the three support frames 312 are distributed in a circular array on the surface of the detection rod 32. At the same time, support frames 31 are installed at the front and rear ends of the detection rod 32 to connect and fix the front and rear sections of the air inlet duct 3. The front and rear two groups of support frames 31 are installed in a linear array. At the same time, a shuttle-shaped fillet 311 is opened on the windward surface of each support frame 312 to reduce wind resistance.

[0063] During the operation of the present invention, the centrifugal fan body 1 is powered on and starts running, and the air inlet duct 3 starts to inhale air from the outside. At this time, the detection rod 32 inside the air inlet duct 3 will detect the wind flow passing through. The specific principle is that the sensing slide 324 inside the detection rod 32 contacts the wind flow through the sensing groove 322. Since the wind flow speed in the air inlet duct 3 is relatively fast, according to Bernoulli's principle, the sensing slide 324 will slide along the detection slide cavity 325, and the sensing slide 324 will drive the sensing spring 323 to expand and contract. At this time, the detection element 321 connected to the sensing spring 323 will measure the wind speed of the air inlet duct 3 by analyzing the deformation of the spring.

[0064] When the wind speed measured by the detection element 321 is large, the detection element 321 will control the drive motor 27 to rotate, thereby driving the transmission gear 26 to rotate, thereby driving the fan gear 25 to rotate. At this time, the rotating ring 23 will rotate, thereby pulling the windshield laminate 22 to rotate along the hinged boss 221. At the same time, the rotating ring 23 will drive the tightening pressure ring 24 to rotate on the fixed rotating ring 21 through the connecting pressure head 243, and the sliding boss 222 of the windshield laminate 22 will slide along the guide slot 231, so that the multiple windshield laminates 22 will perform a spiral aggregation movement. The windshield laminate 22 will expand to increase the air inlet diameter of the air inlet duct 3, so that the air intake volume increases and the wind pressure decreases, thereby reducing the wind speed; similarly, when the wind speed measured by the detection element 321 is small, the wind control component 2 will drive the windshield laminate 22 to retract the air inlet duct 3.

[0065] The description herein is provided to enable one of ordinary skill in the art to implement or use the present disclosure. Various modifications to the present disclosure will be apparent to one of ordinary skill in the art, and the overall principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but should be given the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-speed centrifugal fan for a small dust collector, comprising a centrifugal fan body (1), wherein the centrifugal fan body (1) is mounted on the dust collector, and is characterized in that: The invention also comprises an air control component (2) and an air inlet duct (3), wherein the air inlet duct (3) is installed at the air inlet of the centrifugal fan, a support frame (31) is installed inside the air inlet duct (3), a detection rod (32) for detecting the wind speed and pressure at the air inlet is installed at the connection center of the support frame (31), a detection element (321) for transmitting a control signal is installed inside the detection rod (32), and an air control component (2) for adjusting the air inlet flow rate is installed outside the air inlet duct (3), and the detection element (321) controls the forward and reverse rotation of the air control component (2) by transmitting a control signal, thereby controlling the air volume at the air inlet duct (3).

2. A high-speed centrifugal fan for a small dust collector according to claim 1, characterized in that: The wind control component (2) comprises a fixed rotating ring (21), a wind shielding plate (22), a rotating ring (23), a fixing pressure ring (24), a sector gear (25), a transmission gear (26), a driving motor (27) and a hood (28); the inner end of the fixed rotating ring (21) is fixedly mounted on the outer surface of the air inlet duct (3); one end of the wind shielding plate (22) is hinged to the inner end surface of the fixed rotating ring (21); a rotating ring (23) for driving the wind shielding plate (22) to rotate is also rotatably mounted on the outer surface of the air inlet duct (3); and a guide for limiting the expansion and closing range of the wind shielding plate (22) is provided on the end surface of the rotating ring (23). Toward the slide groove (231), the fixing pressure ring (24) is rotatably mounted on the outer end surface of the fixed rotating ring (21), and the surface array of the fixing pressure ring (24) is installed with a connecting pressure head (243), and the root of the connecting pressure head (243) is fixedly mounted on the outer end surface of the rotating circular ring (23). The fixing pressure ring (24) makes the gap connection between the windshield stacking plates (22) more compact through the fixed connection effect of the connecting pressure head (243), thereby providing airtightness for the contraction and expansion of the windshield stacking plates (22), the fan gear (25) is fixedly connected to the inner end surface of the rotating circular ring (23), and the hood (28) is installed on the centrifugal fan body (1).

3. A high-speed centrifugal fan for a small dust collector according to claim 2, characterized in that: The windshield laminate (22) is a sheet metal bending part, and a hinged boss (221) is installed on the lower end surface of one end of the windshield laminate (22) for hingedly connecting the windshield laminate (22) to the fixed swivel (21), and a sliding boss (222) is installed on the upper end surface of the other end of the windshield laminate (22) for sliding the windshield laminate (22) in the guide groove (231). The sliding boss (222) drives the hinged boss (221) to rotate by linear sliding in the guide groove (231), thereby driving the wind control component (2) to perform a contraction and expansion movement inside the air inlet duct (3).

4. A high-speed centrifugal fan for a small dust collector according to claim 3, characterized in that: The windshield laminates (22) are installed by sliding and stacking at the bending angles thereon; the cross section of the windshield laminates (22) is arc-shaped; the arc-shaped outer sides of the windshield laminates (22) are installed in an annular stacking manner so that the wind control component (2) forms a closed and expanded partition surface.

5. A high-speed centrifugal fan for a small dust collector according to claim 2, characterized in that: The interior of the locking ring (24) is provided with a rolling groove (242) for mounting a rolling steel ball (241), and the outer end surface of the fixed rotating ring (21) is correspondingly provided with a rolling groove (242). The rolling steel ball (241) rolls in the rolling groove (242) so that the locking ring (24) provides an axial clamping force, while the rotating ring (23) drives the windshield laminate (22) to rotate in the direction of the cutting axis. The windshield laminate (22) forms a tight mounting surface, thereby making the air control component (2) more tightly sealed against the air inlet duct (3).

6. A high-speed centrifugal fan for a small dust collector according to claim 2, characterized in that: The tooth top radius of the sector gear (25) is the same as the radius of the rotating ring (23), and the effective meshing teeth of the sector gear (25) correspond to the sliding stroke of the guide slide groove (231), so that the sector gear (25) limits the opening and closing range of the windshield laminate (22).

7. A high-speed centrifugal fan for a small dust collector according to claim 1, characterized in that: A detection element (321) for detecting wind speed is installed inside the detection rod (32), and detection sliding cavities (325) are fixedly installed on both sides of the detection element (321). A sensing slide (324) for sensing the wind speed of the air inlet duct (3) is slidably installed in the detection slide cavity (325), and the sensing slide (324) and the detection element (321) are connected via a sensing spring (323); the outer surface of the detection rod (32) is provided with sensing grooves (322), and the sensing grooves (322) are arranged in a circular pattern on the outer surface of the detection rod (32); the detection element (321) determines the wind speed inside the air inlet duct (3) through the Bernoulli phenomenon generated by the air in the air inlet duct (3) quickly passing through the sensing grooves (322), thereby enabling the wind control component (2) to automatically adjust the expansion and contraction amplitude according to the wind speed.

8. The high-speed centrifugal fan for a small dust collector according to claim 1, characterized in that: The outer end of the sensing slide (324) is provided with an arc convex surface, and the inner end of the sensing slide (324) is provided with a bottom plane. The arc convex surface is directly opposite to the sensing slot (322). The sensing slide (324) slides up and down due to the wind speed pressure difference inside and outside the arc convex surface, and then the sensing slide (324) pulls the sensing spring (323) so that the detection element (321) measures the wind speed.

9. The high-speed centrifugal fan for a small dust collector according to claim 1, characterized in that: The support frames (31) are arranged in groups of two. The support frames (31) are respectively installed at the two ends of the detection rod (32). The support frames (31) are composed of 3-4 support frames (312). One end of the support frame (312) facing the wind inlet direction is provided with a shuttle-shaped fillet (311). The support frame (312) reduces the loss of wind speed at the air inlet through the shuttle-shaped fillet (311), thereby making the detection element more accurate in sensing the wind speed.

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