Energy-saving ventilator for boiler

Abstract

The present application relates to the technical field of centrifugal ventilator, in particular to an energy-saving ventilator for boiler, which comprises a centrifugal drum body, a fan shaft arranged on the centrifugal drum body and used for driving the centrifugal drum body to run, a first bevel gear and a second bevel gear coaxially fixedly installed on the fan shaft, and the first bevel gear and the second bevel gear are symmetrically arranged; a dynamic bevel gear is arranged between the first bevel gear and the second bevel gear, and the dynamic bevel gear moves along the axial direction of the fan shaft; the ventilator can absorb and store the rotational inertia when stopping, so that quick stopping is realized; the absorbed and stored rotational inertia is used to assist the motor unit and the centrifugal impeller to rotate when starting next time, so that the starting inertia is overcome, and the starting response speed of the ventilator is improved.

Description

Technical Field

[0001] This invention relates to the field of centrifugal fan technology, specifically to an energy-saving fan for boilers. Background Technology

[0002] Boiler fans are key equipment in boiler systems used for forced airflow. They primarily use mechanical power to drive the impeller rotation, transporting air or flue gas within the furnace and flue. They are crucial auxiliary equipment for ensuring the safe and efficient operation of the boiler. Boiler fans are mostly centrifugal fans, generating centrifugal force through impeller rotation. This forces airflow into the impeller center and outwards radially to the casing, thus generating air pressure and kinetic energy. Due to their stable air pressure and high efficiency, they can meet the airflow adjustment needs under different loads. Traditional boiler fans continue to rotate for a period of time when stopped due to inertia. During startup, the motor load is high, the starting current is high, and the fan speed needs to be increased slowly. This results in slow start-stop response, hindering precise control and leading to low energy utilization. Summary of the Invention

[0003] The purpose of this invention is to provide an energy-saving ventilator for boilers to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an energy-saving ventilator for a boiler, comprising a centrifugal drum and a fan shaft mounted on the centrifugal drum for driving the centrifugal drum. A first bevel gear and a second bevel gear are coaxially fixedly mounted on the fan shaft, and the first and second bevel gears are symmetrically arranged. A convex vibrating shaft is provided at the end of the fan shaft, and the convex vibrating shaft is in a limiting fit with the fan shaft, allowing the convex vibrating shaft to move only axially relative to the fan shaft. A vibrating shaft tension spring is provided between the convex vibrating shaft and the fan shaft. The fan shaft has an interconnected compressed air chamber and a cylindrical cavity inside. The compressed air chamber can automatically generate positive pressure gas by utilizing the rotation of the fan shaft. A self-locking piston is provided in the cylindrical cavity, and a centrifugal locking block is provided in the self-locking piston. A locking block annular groove is provided on the inner wall of the cylindrical cavity. When the fan shaft rotates, the centrifugal locking block moves outward and inserts into the locking block annular groove to fix the position of the self-locking piston. A piston punch and a punch spring are provided on one side of the self-locking piston.

[0005] A dynamic bevel gear is provided between the first bevel gear and the second bevel gear. The dynamic bevel gear can switch between three states by moving along the axis of the fan shaft: the dynamic bevel gear is engaged with the first bevel gear, the dynamic bevel gear is engaged with the second bevel gear, and the dynamic bevel gear is not in contact with the first and second bevel gears. A storage shaft is coaxially fixed on the dynamic bevel gear, and a torsion chassis is installed at the other end of the storage shaft. A state control component is provided outside the storage shaft and the torsion chassis. The state control component controls the dynamic bevel gear to convert the rotational inertia of the fan when it is stopped into the driving force when it is started.

[0006] It also includes a protective housing and a motor unit. The status control component is located inside the protective housing, and the motor unit is used to drive the fan shaft to rotate, thereby enabling the centrifugal drum to operate.

[0007] The status control component includes a track slide bar and a positioning slide sleeve. The two ends of the track slide bar are fixedly installed on the inner wall of the protective box. The track slide bar passes through the positioning slide sleeve, so that the positioning slide sleeve can slide along the length direction of the track slide bar. The length direction of the track slide bar is parallel to the axis direction of the fan shaft.

[0008] The storage shaft passes through the positioning sleeve, and the storage shaft can rotate relative to the positioning sleeve. The storage shaft and the positioning sleeve are axially limited.

[0009] A synchronization frame is fixedly installed on the outside of the positioning slide sleeve. A control convex frame is fixedly provided on the synchronization frame, and a control thread sleeve is provided in the control convex frame.

[0010] A lead screw motor is fixedly installed inside the protective box. The lead screw motor is equipped with a lead screw shaft, which is screwed with a control sleeve. The lead screw motor controls the rotation of the lead screw shaft, and the lead screw shaft drives the positioning slide sleeve to move and adjust along the length direction of the track slide rod through the control sleeve.

[0011] A storage torsion spring is provided between the positioning slide sleeve and the torsion chassis. When the torsion chassis rotates relative to the positioning slide sleeve, the storage torsion spring can be elastically torsion. A ratchet body is coaxially fixed at the bottom of the torsion chassis. A limiting sleeve is provided on the outside of the ratchet body. A one-way card is provided on the inner wall surface of the limiting sleeve. By cooperating with the ratchet body, the ratchet body can be restricted, so that the ratchet body can only rotate in one direction.

[0012] The restrictive jacket is fixedly provided with a lifting shaft, which passes through the synchronous frame. The axial movement of the lifting shaft can make the restrictive jacket move up and down, thereby controlling the one-way card to engage or disengage with the ratchet body in one direction.

[0013] A split base plate is fixedly installed at the end of the lifting shaft. A shaft spring is installed between the split base plate and the synchronous frame. The shaft spring provides downward elastic pressure to the split base plate, so that the limiting outer sleeve has an elastic tendency to move downward.

[0014] A compression vertical plate is fixedly installed on the lower surface of the split base plate, and a lifting control protrusion is fixedly installed on the lower inner surface of the protective box. The compression vertical plate and the lifting control protrusion are squeezed together to control the position of the outer jacket.

[0015] The outer sleeve moves downward only when the dynamic bevel tooth engages with the second bevel tooth, causing the one-way card to displace and separate from the ratchet body.

[0016] The inside of the torsion chassis is a cavity, in which a lever rocker and a fulcrum shaft are installed. The fulcrum shaft is fixedly installed to the inner wall of the cavity, and the fulcrum shaft passes through the lever rocker, which can swing with the fulcrum shaft as the fulcrum.

[0017] Friction blocks and counterweights are fixedly installed at both ends of the lever rocker. When the torsion chassis rotates, the counterweights are subjected to centrifugal force, which drives the friction blocks to expand outward through the lever rocker.

[0018] The surface of the torsion chassis has a through-slot in the side wall, through which the friction block extends outward. An external friction sleeve is fixedly installed on the synchronization frame. The external friction sleeve is fitted over the outside of the torsion chassis and can make frictional contact with the external friction sleeve when the friction block expands outward.

[0019] The counterweight has a spring blind hole, and a limiting spring is installed in the spring blind hole. The limiting spring is in pressure contact with the inner wall surface of the cavity.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] This invention's energy-saving ventilator, through the coordinated structure of a first and second bevel gear and a state control component, can absorb and store rotational inertia when the ventilator stops, achieving rapid shutdown and precise control of boiler airflow. Upon restarting, the absorbed and stored rotational inertia assists the motor unit and centrifugal impeller in rotation, overcoming starting inertia and improving the ventilator's start-up response speed, resulting in rapid airflow generation. Simultaneously, it reduces the starting current of the motor unit, minimizing impact on the power grid and further increasing energy efficiency. Furthermore, it reduces dust adhesion to the centrifugal impeller surface, maintaining its high efficiency.

[0022] By using a combination of a cavity, lever, rocker arm, limiting spring, and external friction sleeve, the system can automatically dissipate a portion of the rotational inertia through friction between the friction block and the external friction sleeve when the fan speed is too high before shutdown. This prevents excessive rotational inertia from causing excessive torsion to the storage torsion spring and affecting its service life. Furthermore, the amount of energy consumed automatically increases as the fan speed increases before shutdown, thus achieving adaptive protection adjustment. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0024] Figure 2 This is a schematic diagram of the overall structure of the present invention from another angle.

[0025] Figure 3 This is a schematic diagram of the rear structure of the present invention.

[0026] Figure 4 This is a three-dimensional half-sectional view of the present invention.

[0027] Figure 5 This is a partial three-dimensional cross-sectional view of the present invention.

[0028] Figure 6 This is a three-dimensional half-section front view of the present invention.

[0029] Figure 7 This is a schematic diagram of the component structure.

[0030] Figure 8 This is the main view of the component structure.

[0031] Figure 9 A three-dimensional half-section view of the horizontal angle of the chassis.

[0032] Figure 10 This is a schematic diagram of the lever rocker components.

[0033] Figure 11 This is a three-dimensional half-section diagram of the fan shaft.

[0034] Figure 12 This is a partial three-dimensional cross-sectional view of the fan shaft.

[0035] Figure 13 This is a schematic diagram of the outer ring.

[0036] In the diagram: 1. Centrifugal drum; 2. Fan shaft; 3. First bevel gear; 4. Second bevel gear; 5. Dynamic bevel gear; 6. Storage shaft; 7. Torsional chassis; 8. Protective housing; 9. Motor unit; 801. Track slide bar; 802. Positioning sleeve; 803. Synchronization frame; 804. Control convex frame; 805. Control threaded sleeve; 806. Lead screw shaft; 807. Lead screw motor; 808. Storage torsion spring; 809. Ratchet body; 810. Restriction sleeve; 811. One-way card; 812. Lifting insert shaft; 813. Split base plate; 814. Insert shaft spring; 815. Extrusion vertical plate; 816. Lifting control convex part; 701. Cavity; 702. Lever rocker; 703. Pivot shaft 704. Friction block; 705. Counterweight block; 706. Side wall through groove; 707. External friction sleeve; 708. Spring blind hole; 709. Restriction spring; 101. Centrifugal impeller; 901. Chassis frame; 902. Drive wheel; 903. Drive belt; 201. Raised rib vibrating shaft; 202. Vibrating shaft tension spring; 203. Compressed air chamber; 204. Cylindrical cavity; 205. Self-locking piston; 206. Centrifugal locking block; 207. Locking block ring groove; 208. Piston punch shaft; 209. Punch shaft spring; 210. Extrusion air pump; 211. Extrusion component; 212. External ring sleeve; 213. Pressure relief valve; 214. Flow-limiting exhaust hole; 215. Synchronous retaining ring; 216. Axial groove. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figures 1 to 13 This invention provides a technical solution: an energy-saving ventilator for boilers, comprising a centrifugal drum 1 and a fan shaft 2 mounted on the centrifugal drum 1 for driving the centrifugal drum 1. A first bevel gear 3 and a second bevel gear 4 are coaxially welded to the fan shaft 2, and the first bevel gear 3 and the second bevel gear 4 are symmetrically arranged. Figure 4 As shown, the first bevel tooth 3 and the second bevel tooth 4 face each other; a dynamic bevel tooth 5 is provided between the first bevel tooth 3 and the second bevel tooth 4. The dynamic bevel tooth 5 can switch between three states by moving along the axial direction of the fan shaft 2. The three states are: the dynamic bevel tooth 5 is engaged with the first bevel tooth 3, the dynamic bevel tooth 5 is engaged with the second bevel tooth 4, and the dynamic bevel tooth 5 is not in contact with the first bevel tooth 3 and the second bevel tooth 4.

[0039] A storage shaft 6 is coaxially welded to the dynamic bevel gear 5. A torsion chassis 7 is installed at the other end of the storage shaft 6. A state control component is provided on the outside of the storage shaft 6 and the torsion chassis 7. The state control component controls the dynamic bevel gear 5 to convert the rotational inertia of the fan when it stops into the driving force when it starts.

[0040] It also includes a protective housing 8 and a motor unit 9. The status control component is located inside the protective housing 8, and the motor unit 9 is used to drive the fan shaft 2 to rotate, thereby causing the centrifugal drum 1 to operate. The status control component includes a track slide rod 801 and a positioning slide sleeve 802. The two ends of the track slide rod 801 are fixed to the inner wall of the protective housing 8. The track slide rod 801 passes through the positioning slide sleeve 802, allowing the positioning slide sleeve 802 to slide along the length direction of the track slide rod 801. The length direction of the track slide rod 801 is parallel to the axial direction of the fan shaft 2. The storage shaft 6 passes through the positioning slide sleeve 802 and can rotate relative to the positioning slide sleeve 802. The storage shaft 6 is axially limited between the storage shaft 6 and the positioning slide sleeve 802 to prevent the storage shaft 6 from moving relative to the positioning slide sleeve 802 along the axial direction.

[0041] A synchronization frame 803 is welded to the outside of the positioning slide sleeve 802. A control convex frame 804 is welded onto the synchronization frame 803, and a control threaded sleeve 805 is installed in the control convex frame 804. A lead screw motor 807 is fixedly installed inside the protective housing 8 by screws. A lead screw shaft 806 is installed on the lead screw motor 807. The lead screw shaft 806 is screwed into the control threaded sleeve 805. The lead screw motor 807 controls the rotation of the lead screw shaft 806, and the lead screw shaft 806 drives the positioning slide sleeve 802 to move and adjust along the length direction of the track slide bar 801 through the control threaded sleeve 805.

[0042] A storage torsion spring 808 is provided between the positioning sleeve 802 and the torsion chassis 7. When the torsion chassis 7 rotates relative to the positioning sleeve 802, the storage torsion spring 808 can be elastically torsion. A ratchet body 809 is coaxially provided at the bottom of the torsion chassis 7. The ratchet body 809 can be welded to the bottom of the torsion chassis 7 or integrally formed. Inclined teeth are provided on the outer side of the ratchet body 809. A limiting sleeve 810 is provided on the outer side of the ratchet body 809. A one-way card 811 is provided on the inner wall surface of the limiting sleeve 810. By cooperating with the ratchet body 809, the one-way card 811 can restrict the ratchet body 809, so that the ratchet body 809 can only rotate in one direction.

[0043] A lifting shaft 812 is welded onto the limiting sleeve 810. The lifting shaft 812 passes through the synchronous frame 803. The axial movement of the lifting shaft 812 enables the limiting sleeve 810 to move up and down, thereby controlling the one-way card 811 to engage or disengage with the ratchet body 809 in one direction.

[0044] A split base plate 813 is welded to the end of the lifting shaft 812. A shaft spring 814 is provided between the split base plate 813 and the synchronous frame 803. The shaft spring 814 provides downward elastic pressure to the split base plate 813, so that the limiting outer sleeve 810 has an elastic tendency to move downward.

[0045] The lower surface of the split base plate 813 is integrally formed with a pressing vertical plate 815. The lower surface of the inner part of the protective box 8 is welded and fixed with a lifting control protrusion 816. The pressing vertical plate 815 and the lifting control protrusion 816 press together to control the position of the limiting outer sleeve 810. The limiting outer sleeve 810 moves down only when the dynamic bevel tooth 5 is engaged with the second bevel tooth 4, so that the one-way card 811 is misaligned and separated from the ratchet body 809.

[0046] The torsion chassis 7 has an internal cavity 701, within which a lever rocker 702 and a fulcrum shaft 703 are installed. The fulcrum shaft 703 is fixedly installed to the inner wall of the cavity 701 and passes through the lever rocker 702, allowing the lever rocker 702 to swing around the fulcrum shaft 703. Friction blocks 704 and counterweights 705 are fixedly installed at both ends of the lever rocker 702. When the torsion chassis 7 rotates, the counterweights 705 are subjected to centrifugal force, which drives the friction blocks 704 to expand outward via the lever rocker 702.

[0047] A sidewall through-slot 706 is formed on the surface of the torsion chassis 7. The friction block 704 extends outward through the sidewall through-slot 706. An external friction sleeve 707 is fixedly installed on the synchronous frame 803. The external friction sleeve 707 is fitted onto the outside of the torsion chassis 7. When the friction block 704 expands outward, it can make frictional contact with the external friction sleeve 707. A spring blind hole 708 is formed on the counterweight block 705. A limiting spring 709 is installed in the spring blind hole 708. The limiting spring 709 makes pressure contact with the inner wall surface of the cavity 701.

[0048] like Figure 4 As shown, a centrifugal impeller 101 is provided inside the centrifugal drum 1.

[0049] The ventilation fan of this invention is used for ventilation and induced draft in equipment such as boilers. The gas transported by the centrifugal impeller 101 contains a large amount of soot. The soot adhering to the centrifugal impeller 101 can easily cause changes in the airflow path of the centrifugal impeller 101 and reduce the efficiency of the centrifugal impeller 101. The present invention can reduce the soot adhesion on the centrifugal impeller 101 through the following solution.

[0050] A convex vibrating shaft 201 is provided at the end of the fan shaft 2. The convex vibrating shaft 201 is in a limiting fit with the fan shaft 2, so that the convex vibrating shaft 201 can only move axially relative to the fan shaft 2. Figure 12As shown, the outer wall surface of the convex rib vibrating shaft 201 is provided with vertical ribs, and vertical grooves are opened on the inner wall of the fan shaft 2. By limiting the vertical ribs and vertical grooves, the convex rib vibrating shaft 201 can only move axially relative to the fan shaft 2.

[0051] A vibrating shaft tension spring 202 is provided between the convex vibrating shaft 201 and the fan shaft 2, providing elastic tension. The fan shaft 2 has an interconnected compressed air chamber 203 and a cylindrical cavity 204. The compressed air chamber 203 automatically generates positive pressure gas using the rotation of the fan shaft 2. A self-locking piston 205 is installed in the cylindrical cavity 204, and a centrifugal locking block 206 is installed in the self-locking piston 205. A locking block annular groove 207 is provided on the inner wall of the cylindrical cavity 204. When the fan shaft 2 rotates, the centrifugal locking block 206 moves outward and inserts into the locking block annular groove 207 to fix the position of the self-locking piston 205. A piston punch 208 and a punch spring 209 are provided on one side of the self-locking piston 205. The fan shaft 2 is connected to the centrifugal impeller 101 through the convex vibrating shaft 201. The convex vibrating shaft 201 is fixed to the centrifugal impeller 101, so that when the fan shaft 2 rotates, it can drive the centrifugal impeller 101 to rotate, so that the centrifugal drum 1 runs to drive the airflow.

[0052] like Figure 11 As shown, a compression pump 210 and a pressure relief valve 213 are embedded in the inner wall of the compression chamber 203. The compression pump 210 is equipped with a compression component 211. When the compression component 211 is compressed, the compression pump 210 can draw in outside air and input it into the compression chamber 203. The compression pump 210 is composed of a piston cylinder and two sets of one-way valves, which is a common piston pump structure in the prior art. It will not be described in detail in this application. Figure 13 As shown, an outer ring 212 is fixedly installed on the outer casing of the blower. An arc-shaped protrusion is provided on the inner wall of the outer ring 212, so that when the blower shaft 2 drives the extrusion pump 210 to rotate, the outer ring 212 cooperates with the extrusion component 211 to intermittently extrude the extrusion component 211, and continuously inputs positive pressure gas into the interior of the compression chamber 203.

[0053] When the internal air pressure of the compressed air chamber 203 exceeds a set threshold, air is released through the pressure relief valve 213. Figure 13 As shown, a flow-limiting exhaust port 214 is provided at the end of the compressed air chamber 203. The flow-limiting exhaust port 214 is normally open and continuously exhausts gas. However, by setting the diameter of the flow-limiting exhaust port 214 to be small enough, the exhaust rate of the flow-limiting exhaust port 214 is much lower than the gas pumping rate of the extrusion pump 210. The flow-limiting exhaust port 214 can restore the internal pressure of the compressed air chamber 203 to normal when the fan shaft 2 is stationary for a long time.

[0054] A synchronous retaining ring 215 is fixedly installed on the inner wall of the cylindrical cavity 204, and an axial groove 216 is opened on the surface of the piston punch 208. The synchronous retaining ring 215 and the axial groove 216 are matched in a limiting manner, so that when the fan shaft 2 rotates, the piston punch 208 and the self-locking piston 205 rotate synchronously.

[0055] When the fan shaft 2 initially rotates, the centrifugal locking block 206 is thrown out by centrifugal force as the self-locking piston 205 rotates synchronously. The centrifugal locking block 206 moves outward and inserts into the locking block annular groove 207 to fix the position of the self-locking piston 205. During the subsequent continuous rotation of the fan shaft 2, the compression air pump 210 continuously inputs compressed gas into the compression chamber 203. In conjunction with the pressure relief valve 213, the air pressure in the compression chamber 203 is kept within the set threshold range. When the fan shaft 2 stops rotating, the centrifugal force on the centrifugal locking block 206 disappears, and the centrifugal locking block 206 moves out of the locking block ring groove 207. At this time, the self-locking piston 205 is unlocked. Under the pressure of the air in the compressed air chamber 203, the piston shaft 208 moves to the right and impacts the end of the convex vibrating shaft 201, causing the convex vibrating shaft 201 to drive the centrifugal impeller 101 to vibrate, thereby cleaning the dust attached to the centrifugal impeller 101 and reducing the dust adhesion on the surface of the centrifugal impeller 101.

[0056] like Figure 3 As shown, a chassis frame 901 is fixedly installed at the bottom of the protective housing 8, the motor unit 9 and the centrifugal drum 1, and the chassis frame 901 provides fixed support for the three components.

[0057] like Figure 4 As shown, transmission wheels 902 are fixedly installed on the rotating shaft of the motor unit 9 and at the end of the fan shaft 2. A transmission belt 903 is provided between the two sets of transmission wheels 902, and transmission is achieved through the transmission belt 903, so that the motor unit 9 can drive the fan shaft 2 to rotate.

[0058] like Figure 6 and Figure 7 As shown, the lead screw motor 807 drives the lead screw shaft 806 to rotate. Since the lead screw shaft 806 cooperates with the control sleeve 805, it can drive the positioning sleeve 802 to move along the length direction of the track slide bar 801, thereby driving the dynamic bevel gear 5 to move, so that the dynamic bevel gear 5 is engaged with the first bevel gear 3, engaged with the second bevel gear 4, or the dynamic bevel gear 5 is between the first bevel gear 3 and the second bevel gear 4 without contacting each other, realizing the conversion of the above three states.

[0059] When the fan stops, at the same time as the motor unit 9 is de-energized, the dynamic bevel gear 5 is synchronously controlled to engage with the first bevel gear 3. At this time, the rotational inertia of the fan shaft 2 drives the dynamic bevel gear 5 to rotate through the first bevel gear 3. When the dynamic bevel gear 5 rotates, it drives the torsion chassis 7 to rotate through the storage shaft 6. Since the positioning sleeve 802 is fixed, the torsion chassis 7 and the positioning sleeve 802 rotate relative to each other, which torsion the storage torsion spring 808. The rotational force is stored through the elastic deformation of the storage torsion spring 808.

[0060] refer to Figure 5 As shown, during the rotation of the torsion chassis 7 driven by the rotational inertia, the ratchet body 809 and the one-way card 811 can rotate relative to each other. When the rotational inertia is exhausted, the one-way rotational cooperation between the one-way card 811 and the ratchet body 809 restricts the torsion chassis 7 from reversing, thereby keeping the storage torsion spring 808 in an elastic torsion state to store energy.

[0061] When the ventilator starts up again, simultaneously with the energization of motor unit 9, the dynamic bevel gear 5 and the second bevel gear 4 are synchronously controlled to engage. For example... Figure 5 As shown, when the dynamic bevel gear 5 and the second bevel gear 4 are in contact and meshing, the compression vertical plate 815 moves to the left in sync. The compression vertical plate 815, through compression engagement with the lifting control protrusion 816, causes the split base plate 813 and the limiting sleeve 810 to move downward. After the limiting sleeve 810 moves downward, the one-way card 811 and the ratchet body 809 are displaced vertically and separated, losing the restriction on the reversal of the torsion chassis 7. Under the reset force of the storage torsion spring 808, the torsion chassis 7 rotates in the opposite direction, thereby driving the dynamic bevel gear 5 to quickly reverse.

[0062] Because the dynamic bevel gear 5 cooperates with the second bevel gear 4, when the dynamic bevel gear 5 reverses, the rotation direction of the drive fan shaft 2 remains unchanged, still following the rotation direction of the motor unit 9. Thus, driven by the dynamic bevel gear 5, the motor unit 9 overcomes starting inertia, reduces the starting current of the motor unit 9, and simultaneously accelerates the speed increase during startup, improving start-stop response speed. In the above process, only a brief energization of the lead screw motor 807 is needed to drive the lead screw shaft 806 to rotate briefly, achieving a small positional change of the dynamic bevel gear 5. Therefore, the energy consumption generated by the lead screw motor 807 is negligible compared to the energy utilization during the start-stop process of the large motor unit 9, resulting in greater energy savings.

[0063] After the dynamic bevel gear 5 and the second bevel gear 4 engage, the engagement between the dynamic bevel gear 5 and the second bevel gear 4 needs to be separated in a timely manner to prevent the speed of the fan shaft 2 from exceeding the reverse drive speed of the dynamic bevel gear 5 and causing drag. This can be controlled by a preset time, or by using a sensor to detect and store the torsional spring force release of the torsion spring 808 in conjunction with a speed sensor for the fan shaft 2 to control the timing of separation.

[0064] During normal operation of the fan, the dynamic bevel gear 5 is positioned between the first bevel gear 3 and the second bevel gear 4, without contacting them, thus avoiding frictional loss of power during the rotation of the fan shaft 2.

[0065] The torsion chassis 7 rotates synchronously with the dynamic bevel gear 5, as... Figure 9 As shown, the torsion chassis 7 has an internal cavity 701, a lever rocker 702, and other structures. When the fan operates at too high a speed, it stops, and the dynamic bevel gear 5 meshes with the first bevel gear 3, causing the dynamic bevel gear 5 and the torsion chassis 7 to rotate at extremely high speeds. At this time, the rotational inertia is extremely large, which may cause the storage torsion spring 808 to be excessively twisted, affecting its lifespan. This invention, through structural design, ensures that when the rotational speed of the torsion chassis 7 exceeds a certain level, the counterweight 705, under the action of centrifugal force, drives the friction block 704 to expand outward. At this time, the lever rocker 702, with the fulcrum shaft 703 as the fulcrum, forms a lever structure, amplifying the centrifugal force of the counterweight 705, so that the friction block 704 makes frictional contact with the external friction sleeve 707 with greater pressure. This dissipates a portion of the rotational inertia through friction between the friction block 704 and the external friction sleeve 707, without affecting the storage of the remaining rotational inertia.

[0066] The higher the rotational speed of the torsion chassis 7, the greater the contact pressure between the friction block 704 and the outer friction sleeve 707, resulting in more energy being consumed through friction. (See [reference needed]) Figure 10 As shown, a limiting spring 709 is also provided on the counterweight 705, so that when the rotational speed of the torsion chassis 7 is below a certain range, the friction block 704 will not contact the external friction sleeve 707.

[0067] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An energy-saving ventilator for boilers, comprising a centrifugal drum and a fan shaft mounted on the centrifugal drum for driving the centrifugal drum, characterized in that: The first bevel gear and the second bevel gear are coaxially fixedly installed on the fan shaft, and the first bevel gear and the second bevel gear are symmetrically arranged. A dynamic bevel tooth is provided between the first bevel tooth and the second bevel tooth. The dynamic bevel tooth can switch between three states by moving along the axial direction of the wind turbine shaft. The three states are: the dynamic bevel tooth is engaged with the first bevel tooth, the dynamic bevel tooth is engaged with the second bevel tooth, and the dynamic bevel tooth is not in contact with the first bevel tooth and the second bevel tooth. A storage shaft is coaxially fixed on the dynamic bevel gear, and a torsion chassis is installed at the other end of the storage shaft. A state control component is provided on the outside of the storage shaft and the torsion chassis. The state control component controls the dynamic bevel gear to convert the rotational inertia of the fan when it stops into the driving force when it starts. The end of the fan shaft is provided with a convex vibrating shaft, which is limited to the fan shaft so that the convex vibrating shaft can only move axially relative to the fan shaft. A vibrating shaft tension spring is provided between the convex vibrating shaft and the fan shaft. The fan shaft has an interconnected compressed air chamber and a cylindrical cavity. The compressed air chamber can automatically generate positive pressure gas by rotating the fan shaft. A self-locking piston is provided in the cylindrical cavity, and a centrifugal locking block is provided in the self-locking piston. A locking block annular groove is provided on the inner wall of the cylindrical cavity. When the fan shaft rotates, the centrifugal locking block will move outward and insert into the locking block annular groove to fix the position of the self-locking piston. A piston punch and punch spring are provided on one side of the self-locking piston. It also includes a protective housing and a motor unit. The status control component includes a track slide rod and a positioning slide sleeve. The two ends of the track slide rod are fixedly installed on the inner wall of the protective housing. The track slide rod passes through the positioning slide sleeve, so that the positioning slide sleeve can slide along the length direction of the track slide rod. The length direction of the track slide rod is parallel to the axis direction of the fan shaft. The storage shaft passes through the positioning sleeve, and the storage shaft can rotate relative to the positioning sleeve. The storage shaft and the positioning sleeve are axially limited. A synchronization frame is fixedly installed on the outside of the positioning sleeve. A control convex frame is fixedly provided on the synchronization frame, and a control thread sleeve is provided in the control convex frame.

2. The energy-saving ventilator for boilers according to claim 1, characterized in that: The status control component is located inside the protective housing, and the motor unit is used to drive the fan shaft to rotate, thereby enabling the centrifugal drum to operate.

3. The energy-saving ventilator for boilers according to claim 1, characterized in that: A lead screw motor is fixedly installed inside the protective box. The lead screw motor is equipped with a lead screw shaft, which is screwed with a control sleeve. The lead screw motor controls the rotation of the lead screw shaft, and the lead screw shaft drives the positioning slide sleeve to move and adjust along the length direction of the track slide rod through the control sleeve.

4. An energy-saving ventilator for a boiler according to claim 1, characterized in that: A storage torsion spring is provided between the positioning slide sleeve and the torsion chassis. When the torsion chassis rotates relative to the positioning slide sleeve, the storage torsion spring can be elastically torsion. A ratchet body is coaxially fixed at the bottom of the torsion chassis. A limiting sleeve is provided on the outside of the ratchet body. A one-way card is provided on the inner wall surface of the limiting sleeve. By cooperating with the ratchet body, the ratchet body can be restricted, so that the ratchet body can only rotate in one direction.

5. An energy-saving ventilator for a boiler according to claim 4, characterized in that: The restrictive jacket is fixedly provided with a lifting shaft, which passes through the synchronous frame. The axial movement of the lifting shaft can make the restrictive jacket move up and down, thereby controlling the one-way card to engage or disengage with the ratchet body in one direction.

6. An energy-saving ventilator for a boiler according to claim 5, characterized in that: A split base plate is fixedly installed at the end of the lifting shaft. A shaft spring is installed between the split base plate and the synchronous frame. The shaft spring provides downward elastic pressure to the split base plate, so that the limiting outer sleeve has an elastic tendency to move downward. A compression vertical plate is fixedly installed on the lower surface of the split base plate, and a lifting control protrusion is fixedly installed on the lower inner surface of the protective box. The compression vertical plate and the lifting control protrusion are squeezed together to control the position of the outer jacket. The outer sleeve moves downward only when the dynamic bevel tooth engages with the second bevel tooth, causing the one-way card to displace and separate from the ratchet body.

7. An energy-saving ventilator for a boiler according to claim 1, characterized in that: The inside of the torsion chassis is a cavity, in which a lever rocker and a fulcrum shaft are installed. The fulcrum shaft is fixedly installed to the inner wall of the cavity, and the fulcrum shaft passes through the lever rocker, which can swing with the fulcrum shaft as the fulcrum.

8. An energy-saving ventilator for a boiler according to claim 7, characterized in that: Friction blocks and counterweights are fixedly installed at both ends of the lever rocker. When the torsion chassis rotates, the counterweight is subjected to centrifugal force, which drives the friction blocks to expand outward through the lever rocker. A side wall through groove is opened through the surface of the torsion chassis, through which the friction blocks extend outward. An external friction sleeve is fixedly installed on the synchronization frame. The external friction sleeve is fitted outside the torsion chassis and can make frictional contact with the external friction sleeve when the friction blocks expand outward. A spring blind hole is opened on the counterweight, and a limiting spring is installed in the spring blind hole. The limiting spring is in pressure contact with the inner wall surface of the cavity.

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