Volute assembly of induced draft fan and induced draft fan applying volute assembly

Abstract

The induced draft fan volute assembly comprises a base and a machine shell, a plurality of supporting legs are fixedly connected to one side of the top of the base, the upper ends of the supporting legs are fixedly connected with the machine shell, and a mounting frame is fixedly connected to the side, located on the machine shell, of the top of the base; a motor is fixedly installed on the installation frame, the output end of the motor is fixedly connected with a main shaft, and the other end of the main shaft extends into the machine shell and is fixedly connected with a hub. According to the induced draft fan volute assembly and the induced draft fan applying the induced draft fan volute assembly, the side plates can be rapidly detached through the threaded rods and the nuts, accumulated dust of an internal impeller / volute or maintenance of blades is facilitated, gaps between the side plates and a machine shell are filled with sealing gaskets, air leakage losses are reduced, and the air inducing efficiency is improved; according to the induced draft fan, the air inlet position can be flexibly adjusted or a filtering device is additionally arranged, the air inlet amount can be adjusted through the air amount adjusting assembly arranged in the air inlet pipe, and therefore the practicability of the induced draft fan is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of induced draft fan, in particular to an induced draft fan volute assembly and an induced draft fan applying the same. BACKGROUND

[0002] High-speed induced draft fan is widely used in industrial, mine, tunnel, vehicle and building ventilation, dust removal and cooling; boiler ventilation and induced draft, and cooling and ventilation in air conditioning equipment and household equipment. Among them, the boiler induced draft fan is a kind of driven fluid machinery, which improves the gas pressure and sends the gas by the mechanical energy input by the motor. Its working principle is basically the same as that of turbine compressor, but since the gas flow rate is low, the pressure change is not large, and the change of gas specific volume generally does not need to be considered, that is, the gas is treated as incompressible fluid.

[0003] However, the volute of the existing induced draft fan is of an integral structure, which is relatively troublesome to disassemble and assemble, thereby causing the cleaning and maintenance of the interior of the induced draft fan to be relatively inconvenient for the staff. In addition, the air volume of the existing induced draft fan cannot be adjusted during use, thereby causing the practicability of the induced draft fan to be relatively low.

[0004] To solve the above problems, an induced draft fan volute assembly and an induced draft fan applying the same are provided in the present application. SUMMARY

[0005] The present application aims to provide an induced draft fan volute assembly and an induced draft fan applying the same, which are mainly used to solve the problems that the volute of the existing induced draft fan is of an integral structure, which is relatively troublesome to disassemble and assemble, thereby causing the cleaning and maintenance of the interior of the induced draft fan to be relatively inconvenient for the staff, and the air volume of the existing induced draft fan cannot be adjusted during use, thereby causing the practicability of the induced draft fan to be relatively low.

[0006] To solve the above technical problems, the present application provides the following technical scheme:

[0007] An induced draft fan volute assembly and an induced draft fan applying the same, which comprise a base and a casing. A plurality of supporting legs are fixedly connected to one side of the top of the base. The upper ends of the supporting legs are fixedly connected with the casing. An installation rack is fixedly connected to one side of the top of the base. A motor is fixedly installed on the installation rack. The output end of the motor is fixedly connected with a main shaft. The other end of the main shaft extends into the casing and is fixedly connected with a hub. A plurality of blades are fixedly connected to the outer wall of the hub and are distributed equidistantly in a circumferential array on the hub. An air outlet is formed in the top of the casing. A side plate is detachably connected to one side of the casing. A plurality of threaded rods are fixedly connected to one side of the casing. A plurality of through holes matched with the threaded rods are formed in the side plate. Nuts are threadedly connected to the ends of the threaded rods away from the casing. Sealing gaskets are fixedly connected to the contact surfaces of the casing and the side plate. An air inlet is formed in the side plate. An air inlet pipe is detachably connected to the side plate at the air inlet. An air volume adjusting assembly is arranged in the air inlet pipe.

[0008] The working principle and beneficial effects of the present application are as follows:

[0009] 1. Working principle: The base supports the casing through the legs, the motor is installed on the mounting bracket, the device is connected to the power supply, the motor is started, the hub and the blades are driven to rotate through the main shaft to form an air flow; the air flow enters through the air inlet of the side plate and is discharged from the air outlet at the top of the casing, the side plate is connected to the casing through the threaded rod, the nut locks the threaded rod to fix the side plate, and the sealing gasket is arranged on the contact surface to prevent air leakage; the air inlet pipe is connected to the air inlet of the side plate to introduce external air flow.

[0010] 2. Beneficial effects:

[0011] (1) The side plate can be quickly disassembled through the threaded rod and the nut, which is convenient for cleaning the internal impeller / volute dust or overhauling the blades;

[0012] (2) The sealing gasket fills the gap between the side plate and the casing, reduces air leakage loss, and improves the induced draft efficiency;

[0013] (3) The air inlet pipe is independently connected to the side plate, which can flexibly adjust the air inlet position or add a filtering device;

[0014] (4) The air volume adjusting assembly arranged inside the air inlet pipe can adjust the air inlet volume, thereby effectively improving the practicality of the induced draft fan.

[0015] Preferably, the end of the outer wall of the air inlet pipe close to the side plate is fixedly connected with symmetrical mounting blocks, the side plate is fixedly connected with symmetrical mounting shells, the mounting shells are both provided with mounting grooves matched with the mounting blocks, and the end of the side plate close to the mounting shells is both provided with a locking assembly for fixing the mounting blocks in the mounting grooves. When the air inlet pipe is installed, one end of the air inlet pipe is fitted with the side plate, then the air inlet pipe is rotated to make the mounting blocks at one end of the air inlet pipe enter the mounting grooves of the mounting shells, and then the mounting blocks are fixed in the mounting grooves through the locking assembly, thereby completing the fixation of the air inlet pipe and the side plate. The installation and disassembly of the air inlet pipe can be completed without tools, different specifications of air inlet pipes (such as elbows and straight pipes) can be replaced or the inside of the air inlet pipe can be cleaned, the mounting grooves and the mounting blocks are matched to ensure that the air inlet pipe is coaxial with the air inlet, and the efficiency is improved by avoiding air flow deviation.

[0016] Preferably, the locking assembly comprises a sliding cavity opened on one end of the mounting shell on the side plate, a wedge-shaped block is slidably connected inside the sliding cavity, one side of the wedge-shaped block extends out of the sliding cavity, the other side is fixedly connected with a spring, the other end of the spring is fixedly connected with the inner wall of the sliding cavity, a clamping groove matched with the wedge-shaped block is opened on the mounting block, when the mounting block is inserted into the mounting groove, the wedge-shaped block is extruded into the sliding cavity, after the mounting block is completely inserted into the mounting groove, the wedge-shaped block is popped out under the action of the spring and clamped into the clamping groove of the mounting block, so as to realize fixation, which makes the installation of the air inlet pipe more convenient, and the spring provides continuous elastic force to ensure that the air inlet pipe will not be loosened due to vibration during operation.

[0017] Preferably, a button is slidably connected inside the clamping groove, one end of the button extends out of the mounting block, the other end is arranged in abutment with the wedge-shaped block, first sliding blocks are fixedly connected on both sides of the button, first sliding grooves matched with the first sliding blocks are opened on both sides of the inner wall of the clamping groove, the button is pressed to push the wedge-shaped block to retract into the sliding cavity, and at the same time the first sliding blocks are guided in the first sliding grooves, so as to ensure linear motion of the button, after the wedge-shaped block is separated from the clamping groove on the mounting block, reverse rotation of the air inlet pipe can make the mounting block separate from the mounting groove, so as to complete disassembly of the air inlet pipe, which makes disassembly of the air inlet pipe more convenient.

[0018] Preferably, symmetrical rolling balls are rotatably connected on the side of the wedge-shaped block extending out of the sliding cavity, which can reduce friction between the wedge-shaped block and the mounting block, so as to make disassembly and assembly of the air inlet pipe more effortless and labor-saving.

[0019] Preferably, the air volume adjusting assembly comprises a semicircular plate rotatably connected inside the air inlet pipe, a fixed plate is fixedly connected with the inner wall of the air inlet pipe on one side of the semicircular plate, a semicircular groove is opened on the fixed plate, a driving assembly for rotating the semicircular plate is arranged on the outer wall of the air inlet pipe, the semicircular plate is rotatably connected inside the air inlet pipe, and the angle thereof is changed by the driving assembly to block part of the semicircular groove and adjust the air inlet cross-sectional area, so as to control the air volume, which dynamically adjusts the air volume without replacing the air inlet pipe, adapts to different working conditions, and the semicircular plate and the fixed plate (with the semicircular groove) are designed to rotate flexibly and controllably.

[0020] Preferably, a filter screen is fixedly connected with the inner wall of the semicircular groove, and a rubber scraping strip is fixedly connected with one side of the semicircular plate, the filter screen arranged on the inner wall of the semicircular groove of the fixed plate can be used to intercept impurities in the airflow, so as to protect the impeller from damage by large-particle impurities and prolong the service life of the equipment; when the semicircular plate rotates, the rubber scraping strip thereon scrapes the surface of the filter screen to remove dust, so that the rubber scraping strip synchronously cleans the filter screen when adjusting the air volume, and the frequency of manual maintenance is reduced.

[0021] Preferably, the driving assembly comprises an annular housing fixedly connected to the outer wall of the air inlet pipe, a gear rotatably connected to the inner part of the annular housing, a gear ring meshingly connected to the outer wall of the gear, the inner wall of the gear ring fixedly connected to the outer wall of the semicircular plate, a rotating shaft fixedly connected to the shaft center of one side of the gear, the other end of the rotating shaft extending out of the annular housing and being slidingly connected to a knob, the end of the rotating shaft away from the gear being fixedly connected to symmetrical second sliding blocks, the inner wall of the knob being provided with second sliding grooves matched with the second sliding blocks, one side of the annular housing being provided with a limiting assembly for fixing the knob, the gear being connected to the knob through the rotating shaft, the gear ring being rotated when the knob is rotated, the gear ring being fixed to the outer wall of the semicircular plate, so as to control the angle of the semicircular plate; the second sliding blocks are guided in the second sliding grooves, so as to ensure that the rotating shaft and the knob rotate coaxially, the rotation of the semicircular plate changes the relative position relationship between the semicircular plate and the semicircular groove, so as to adjust the air inlet cross-sectional area of the air inlet pipe, finally realizing the adjustment of the air inlet amount; when the knob is rotated to the appropriate position, that is, the air inlet amount is adjusted to the required size, the knob needs to be fixed at the position through the limiting assembly, so as to prevent the knob from rotating by itself due to vibration and other factors during the operation of the equipment, causing the air inlet amount to change.

[0022] Preferably, the limiting assembly comprises a plug rod fixedly connected to one side of the annular housing, a plurality of plug slots matched with the plug rod being circumferentially and equidistantly provided on one side of the knob, and the corners of the inner walls of the plug slots at the openings are all chamfered; after the plug rod is separated from the plug slot by pulling the knob, the air inlet amount can be adjusted by rotating the knob; after the air inlet amount is adjusted to the required size, the plug rod is inserted into the corresponding plug slot after the knob is pressed, so that the knob can be fixed well, preventing the knob from rotating by itself due to vibration, ensuring the stability after the air volume is adjusted; the corners of the inner walls of the plug slots at the openings are all chamfered, so that the plug rod can be quickly aligned and inserted into the plug slot, improving the use experience.

[0023] Preferably, the end of the plug rod away from the annular housing is fixedly connected to a magnet, and the inner parts of the plug slots are all fixedly connected to iron sheets attracted to the magnet; the magnet at the end of the plug rod and the iron sheets in the plug slots are mutually attracted, so as to enhance the connection firmness of the plug rod and the plug slot, which can effectively avoid the plug rod from being separated due to slight vibration, and the magnetic attraction facilitates the quick insertion of the plug rod into the plug slot, and manual force can overcome the magnetic force to unlock. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a three-dimensional structure schematic diagram of the whole application;

[0025] Figure 2 It is a plane structure schematic diagram of the side view of the application;

[0026] Figure 3 It is a whole cross-sectional structure schematic diagram of the front view of the application;

[0027] Figure 4The overall explosion structure schematic diagram of the machine shell of the present application;

[0028] Figure 5 The overall structure schematic diagram of the air inlet pipe of the present application;

[0029] Figure 6 The overall cross-sectional structure schematic diagram of the present application from the side view;

[0030] Figure 7 The overall cross-sectional structure schematic diagram of the present application from the top view;

[0031] Figure 8 The local enlarged cross-sectional structure schematic diagram of the air inlet pipe of the present application;

[0032] Figure 9 The enlarged structure schematic diagram of A in the present application; Figure 7

[0033] Figure 10 The enlarged structure schematic diagram of B in the present application; Figure 8

[0034] In the figure: 1, base; 2, machine shell; 3, supporting leg; 4, mounting rack; 5, motor; 6, main shaft; 7, wheel hub; 8, blade; 9, air outlet; 10, side plate; 11, threaded rod; 12, through hole; 13, nut; 14, sealing gasket; 15, air inlet; 16, air inlet pipe; 17, mounting block; 18, mounting shell; 19, mounting groove; 20, sliding cavity; 21, wedge-shaped block; 22, spring; 23, clamping groove; 24, button; 25, first sliding block; 26, first sliding groove; 27, ball; 28, semicircular plate; 29, fixed plate; 30, semicircular groove; 31, annular shell; 32, gear; 33, toothed ring; 34, rubber scraping strip; 35, rotating shaft; 36, knob; 37, second sliding block; 38, second sliding groove; 39, insertion rod; 40, insertion groove; 41, magnet; 42, iron sheet; 43, filter screen. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0036] Please refer to Figures 1-10 ​​The utility model provides an air -inducing fan volute assembly and application thereof, including base 1 and casing 2, one side fixedly connected with a plurality of support legs 3 on the top of base 1, and the upper end of support leg 3 is fixedly connected with casing 2, and the top of base 1 is fixedly connected with mounting bracket 4 on the side of casing 2, and motor 5 is fixedly installed on mounting bracket 4, and the output end of motor 5 is fixedly connected with main shaft 6, and the other end of main shaft 6 extends to the inside of casing 2 and is fixedly connected with wheel hub 7, and a plurality of blades 8 are fixedly connected on the outer wall of wheel hub 7, and the blade 8 is distributed on wheel hub 7 in the form of circumferential array equidistance, and base 1 supports casing 2 through support leg 3, and motor 5 is installed on mounting bracket 4, and the device is connected power after starting motor 5, and wheel hub 7 and blade 8 are driven to rotate through main shaft 6, and the air flow is formed,

[0037] The top of casing 2 is provided with air outlet 9, and one side of casing 2 is detachably connected with side plate 10, and side plate 10 is provided with air inlet 15, and the air flow enters through air inlet 15 of side plate 10 and is discharged from the top of casing 2, and air inlet pipe 16 is detachably connected to side plate 10 at air inlet 15, and air inlet pipe 16 is connected with air inlet 15 of side plate 10, which is used for introducing external air flow, and air volume adjusting assembly is arranged in air inlet pipe 16, and the air volume can be adjusted through air volume adjusting assembly, so that the practicability of air -inducing fan is effectively improved.

[0038] A plurality of threaded rods 11 are fixedly connected to one side of casing 2, a plurality of through holes 12 matched with threaded rods 11 are formed in side plate 10, nuts 13 are threadedly connected to the ends of threaded rods 11 away from casing 2, sealing pads 14 are fixedly connected to the contact surfaces of casing 2 and side plate 10, side plate 10 is connected with casing 2 through threaded rods 11, nuts 13 lock threaded rods 11 to fix side plate 10, and sealing pads 14 are arranged on the contact surfaces to prevent air leakage and improve air -inducing efficiency.

[0039] More specifically, symmetric mounting blocks 17 are fixedly connected to one end of the outer wall of air inlet pipe 16 close to side plate 10, symmetric mounting shells 18 are fixedly connected to side plate 10, mounting grooves 19 matched with mounting blocks 17 are formed in mounting shells 18, locking assemblies for fixing mounting blocks 17 in mounting grooves 19 are arranged on one end of side plate 10 close to mounting shells 18, when air inlet pipe 16 is mounted, one end of air inlet pipe 16 is fitted with side plate 10, then mounting blocks 17 at one end of air inlet pipe 16 are made to enter the inside of mounting grooves 19 on mounting shells 18 by rotating air inlet pipe 16, and then mounting blocks 17 are fixed in mounting grooves 19 through locking assemblies, the mounting and dismounting of air inlet pipe 16 can be completed without tools, different specifications of air inlet pipe 16 (such as elbow, straight pipe) or the inside of air inlet pipe 16 can be conveniently replaced or cleaned, and mounting grooves 19 and mounting blocks 17 are matched to ensure that air inlet pipe 16 is coaxial with air inlet 15, so as to avoid the decrease of efficiency caused by air flow deflection.

[0040] More specifically, the locking assembly includes a slide cavity 20 formed in one end of the mounting shell 18 on the side plate 10, a wedge block 21 slidably connected inside the slide cavity 20, the wedge block 21 extending out of the slide cavity 20 on one side, a spring 22 fixedly connected to the other side of the wedge block 21, the other end of the spring 22 fixedly connected to the inner wall of the slide cavity 20, a clamping groove 23 formed in the mounting block 17 matching the wedge block 21, when the mounting block 17 is inserted into the mounting slot 19, the wedge block 21 is pressed into the slide cavity 20, and after the mounting block 17 is completely inserted into the mounting slot 19, the wedge block 21 is ejected under the action of the spring 22 and clamped into the clamping groove 23 of the mounting block 17, achieving fixation. This makes the installation of the air inlet pipe 16 more convenient, and the spring 22 provides continuous elastic force to ensure that the air inlet pipe 16 does not loosen due to vibration during operation.

[0041] More specifically, the inside of the clamping groove 23 is slidably connected with a button 24, one end of the button 24 extending out of the mounting block 17, the other end abutting against the wedge block 21, the two sides of the button 24 are fixedly connected with first sliding blocks 25, and the two sides of the inner wall of the clamping groove 23 are provided with first sliding grooves 26 matching the first sliding blocks 25. Pressing the button 24 pushes the wedge block 21 to retract into the slide cavity 20, and at the same time, the first sliding blocks 25 are guided in the first sliding grooves 26, ensuring the linear motion of the button 24. When the wedge block 21 is disengaged from the clamping groove 23 on the mounting block 17, reversing the air inlet pipe 16 can make the mounting block 17 disengage from the mounting slot 19, thereby completing the disassembly of the air inlet pipe 16. This makes the disassembly of the air inlet pipe 16 more convenient.

[0042] More specifically, the side of the wedge block 21 extending out of the slide cavity 20 is rotatably connected with symmetrical balls 27, which can reduce the friction between the wedge block 21 and the mounting block 17, thereby making the disassembly and assembly of the air inlet pipe 16 more effortless and labor-saving.

[0043] More specifically, the air volume adjusting assembly includes a semicircular plate 28 rotatably connected inside the air inlet pipe 16, a fixed plate 29 fixedly connected to one side of the inner wall of the air inlet pipe 16, a semicircular groove 30 formed in the fixed plate 29, a driving assembly provided on the outer wall of the air inlet pipe 16 for rotating the semicircular plate 28, the semicircular plate 28 rotatably connected inside the air inlet pipe 16, the angle of the semicircular plate 28 changed by the driving assembly to block part of the semicircular groove 30 and adjust the air inlet cross-sectional area, thereby controlling the air volume. This can dynamically adjust the air volume without replacing the air inlet pipe 16, and adapt to different working conditions. The semicircular plate 28 and the fixed plate 29 with the semicircular groove 30 are designed to rotate flexibly and have controllable sealing performance.

[0044] More specifically, a filter screen 43 is fixedly connected to the inner wall of the semicircular groove 30. The filter screen 43 can be used to intercept impurities in the airflow, thus protecting the impeller from damage by large particles and extending the equipment life. A rubber scraper 34 is fixedly connected to one side of the semicircular plate 28. When the semicircular plate 28 rotates, the rubber scraper 34 scrapes the surface of the filter screen 43 to remove accumulated dust. This allows the rubber scraper 34 to clean the filter screen 43 simultaneously when adjusting the airflow, reducing the frequency of manual maintenance.

[0045] More specifically, the drive assembly includes an annular housing 31 fixedly connected to the outer wall of the air inlet pipe 16. A gear 32 is rotatably connected inside the annular housing 31. A gear ring 33 is meshed with the outer wall of the gear 32. The inner wall of the gear ring 33 is fixedly connected to the outer wall of the semi-circular plate 28. A rotating shaft 35 is fixedly connected to the axis on one side of the gear 32. The other end of the rotating shaft 35 extends out of the annular housing 31 and is slidably connected to a knob 36. A symmetrical second slider 37 is fixedly connected to the outer wall of the rotating shaft 35 away from the gear 32. A second groove 38 matching the second slider 37 is opened on the inner wall of the knob 36. A limiting component for fixing the knob 36 is provided on one side of the annular housing 31.

[0046] Gear 32 is connected to knob 36 via shaft 35. When knob 36 is rotated, gear 32 drives meshing gear ring 33 to rotate. Gear ring 33 is fixed to the outer wall of semicircular plate 28, thereby controlling the angle of semicircular plate 28. Second slider 37 is guided in second slide groove 38 to ensure that shaft 35 and knob 36 rotate coaxially. Rotation of semicircular plate 28 will change its relative position relationship with semicircular groove 30, thereby adjusting the air intake cross-sectional area of ​​air intake pipe 16, and finally realizing the adjustment of air intake volume. When knob 36 is rotated to the appropriate position, that is, after the air intake volume is adjusted to the required size, knob 36 needs to be fixed in this position by limit component to prevent it from rotating on its own due to vibration and other factors during equipment operation, which would cause changes in air intake volume.

[0047] More specifically, the limiting component includes a rod 39 fixedly connected to one side of the annular housing 31. A plurality of slots 40 matching the rod 39 are equidistantly arranged in a circular array on one side of the knob 36. After pulling the knob 36 to disengage the rod 39 from the slot 40, the air intake can be adjusted by rotating the knob 36. After the air intake is adjusted to the required size, pressing the knob 36 to insert the rod 39 into the corresponding slot 40 can effectively fix the knob 36, preventing the knob 36 from rotating on its own due to vibration and ensuring the stability after air volume adjustment.

[0048] The corners of the inner wall of slot 40 at the opening are all chamfered, so that the insertion rod 39 can be quickly aligned and inserted into slot 40, improving the user experience.

[0049] More specifically, the end of the insertion rod 39 away from the annular shell 31 is fixedly connected with a magnet 41, and the inside of the insertion slot 40 is fixedly connected with an iron sheet 42 which is attracted to the magnet 41, the magnet 41 at the end of the insertion rod 39 and the iron sheet 42 in the insertion slot 40 are mutually attracted, which enhances the connection firmness of the insertion rod 39 and the insertion slot 40, so that the insertion rod 39 can be effectively prevented from being shaken out, and the magnetic attraction facilitates the quick insertion of the insertion rod 39 into the insertion slot 40, and manual force can overcome the magnetic force to be unlocked.

[0050] From the above, the specific embodiment of the present application is as follows:

[0051] When the air induction fan is used, one end of the air inlet pipe 16 is first attached to the side plate 10, and then the air inlet pipe 16 is rotated to make the mounting block 17 at one end of the air inlet pipe 16 enter the inside of the mounting groove 19 on the mounting shell 18, the wedge-shaped block 21 is pressed into the inside of the sliding cavity 20, after the mounting block 17 is completely inserted into the inside of the mounting groove 19, the wedge-shaped block 21 is popped out under the action of the spring 22, and is clamped into the clamping groove 23 of the mounting block 17, so that the fixing is realized, that is, the installation of the air inlet pipe 16 is completed, then the air induction fan is connected to the power supply, the motor 5 is started to make the main shaft 6 rotate, the wheel hub 7 and the blade 8 are driven to rotate through the main shaft 6, the airflow is formed, the airflow enters through the air inlet 15 of the side plate 10 and is discharged from the air outlet 9 at the top of the machine shell 2, the side plate 10 is connected to the machine shell 2 through the threaded rod 11, the nut 13 locks the threaded rod 11 to fix the side plate 10, the sealing gasket 14 is arranged on the contact surface to prevent air leakage, the air induction efficiency is improved, after the knob 36 is pulled to make the insertion rod 39 disengage from the insertion slot 40, when the knob 36 is rotated, the gear 32 drives the meshed gear ring 33 to rotate, the gear ring 33 is fixed to the outer wall of the semicircular plate 28, so that the angle of the semicircular plate 28 is controlled; the second sliding block 37 is guided in the second sliding groove 38, so that the rotation shaft 35 and the knob 36 are coaxially rotated, the rotation of the semicircular plate 28 changes the relative positional relationship between the semicircular plate 28 and the semicircular groove 30, so that the air inlet cross-sectional area of the air inlet pipe 16 is adjusted, and finally the air inlet quantity is adjusted, when the knob 36 is rotated to the appropriate position, that is, the air inlet quantity is adjusted to the required size, after the knob 36 is pressed to make the insertion rod 39 inserted into the inside of the corresponding insertion slot 40, the magnet 41 at the end of the insertion rod 39 and the iron sheet 42 in the insertion slot 40 are mutually adsorbed, so that the knob 36 is well fixed, the self-rotation of the knob 36 due to vibration is prevented, the stability after the air quantity is adjusted is ensured, during the operation of the air induction fan, the filter screen 43 arranged on the inner wall of the semicircular groove 30 of the fixed plate 29 can be used to intercept impurities in the airflow, so that the impeller is protected from damage by large-particle impurities, the equipment life is prolonged, and when the semicircular plate 28 rotates, the rubber scraping strip 34 thereon scrapes the surface of the filter screen 43 to remove dust, so that the rubber scraping strip 34 synchronously cleans the filter screen 43 when the air quantity is adjusted, the frequency of manual maintenance is reduced, the button 24 is pressed to drive the wedge-shaped block 21 to retract into the sliding cavity 20, and the first sliding block 25 is guided in the first sliding groove 26, so that the linear motion of the button 24 is ensured, after the wedge-shaped block 21 disengages from the clamping groove 23 on the mounting block 17, the mounting block 17 is disengaged from the mounting groove 19 by reversely rotating the air inlet pipe 16, so that the disassembly of the air inlet pipe 16 is completed, so that the air inlet pipe 16 is more convenient to disassemble and assemble, so that different specifications of air inlet pipes 16 (such as elbows and straight pipes) or the inside of the air inlet pipe 16 are conveniently cleaned.

[0052] The above merely describes the preferred embodiments of the present application and is not used to limit the present application, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or equivalently replace some technical features thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An induced draft fan volute assembly and an induced draft fan using the same, comprising a base (1) and a housing (2), characterized in that, Multiple support legs (3) are fixedly connected to one side of the top of the base (1). The upper ends of the support legs (3) are fixedly connected to the housing (2). A mounting bracket (4) is fixedly connected to the top of the base (1) on one side of the housing (2). A motor (5) is fixedly installed on the mounting bracket (4). A main shaft (6) is fixedly connected to the output end of the motor (5). The other end of the main shaft (6) extends into the housing (2) and is fixedly connected to a hub (7). Multiple blades (8) are fixedly connected to the outer wall of the hub (7). The blades (8) are evenly distributed in a circular array on the hub (7). An air outlet (9) is opened on the top of the housing (2). A side plate (10) is detachably connected to one side of the housing (2). Multiple threaded rods (11) are fixedly connected to one side of the housing (2). Multiple through holes (12) matching the threaded rods (11) are opened on the side plate (10). A nut (13) is threadedly connected to the end of the threaded rod (11) away from the housing (2). A sealing gasket (14) is fixedly connected to the contact surface between the housing (2) and the side plate (10). An air inlet (15) is opened on the side plate (10). An air inlet pipe (16) is detachably connected to the side plate (10) at the air inlet (15). An air volume adjustment component is installed inside the air inlet pipe (16).

2. The induced draft fan volute assembly and the induced draft fan using the same as claimed in claim 1, characterized in that: A symmetrical mounting block (17) is fixedly connected to one end of the outer wall of the air inlet pipe (16) near the side plate (10). A symmetrical mounting shell (18) is fixedly connected to the side plate (10). Each mounting shell (18) has a mounting groove (19) that matches the mounting block (17). Each side plate (10) has a locking component at one end of the mounting shell (18) for fixing the mounting block (17) inside the mounting groove (19).

3. The induced draft fan volute assembly and the induced draft fan using the same as described in claim 2, characterized in that: The locking assembly includes a sliding cavity (20) on the side plate (10) located at one end of the mounting shell (18). A wedge block (21) is slidably connected inside the sliding cavity (20). One side of the wedge block (21) extends out of the sliding cavity (20), and a spring (22) is fixedly connected to the other side. The other end of the spring (22) is fixedly connected to the inner wall of the sliding cavity (20). A slot (23) matching the wedge block (21) is provided on the mounting block (17).

4. The induced draft fan volute assembly and the induced draft fan using the same as described in claim 3, characterized in that: A button (24) is slidably connected inside the slot (23). One end of the button (24) extends out to the mounting block (17), and the other end is set against the wedge block (21). A first slider (25) is fixedly connected to both sides of the button (24). A first groove (26) matching the first slider (25) is opened on both sides of the inner wall of the slot (23).

5. The induced draft fan volute assembly and the induced draft fan using the same as described in claim 3, characterized in that: The wedge block (21) extends out of one side of the slide cavity (20) and is rotatably connected to symmetrical balls (27).

6. The induced draft fan volute assembly and the induced draft fan using the same as claimed in claim 1, characterized in that: The air volume regulating component includes a semi-circular plate (28) rotatably connected inside the air inlet pipe (16). A fixing plate (29) is fixedly connected to one side of the semi-circular plate (28) on the inner wall of the air inlet pipe (16). A semi-circular groove (30) is provided on the fixing plate (29). A drive component for rotating the semi-circular plate (28) is provided on the outer wall of the air inlet pipe (16).

7. The induced draft fan volute assembly and the induced draft fan using the same as claimed in claim 6, characterized in that: A filter screen (43) is fixedly connected to the inner wall of the semicircular groove (30), and a rubber scraper (34) is fixedly connected to one side of the semicircular plate (28).

8. The induced draft fan volute assembly and the induced draft fan using the same as claimed in claim 6, characterized in that: The drive assembly includes an annular housing (31) fixedly connected to the outer wall of the air inlet pipe (16), a gear (32) rotatably connected inside the annular housing (31), a gear ring (33) meshing with the outer wall of the gear (32), the inner wall of the gear ring (33) fixedly connected to the outer wall of the semi-circular plate (28), a rotating shaft (35) fixedly connected to the axis on one side of the gear (32), the other end of the rotating shaft (35) extending out of the annular housing (31) and slidably connected to a knob (36), a symmetrical second slider (37) fixedly connected to the outer wall of the rotating shaft (35) away from the gear (32), a second groove (38) matching the second slider (37) is opened on the inner wall of the knob (36), and a limiting component for fixing the knob (36) is provided on one side of the annular housing (31).

9. The induced draft fan volute assembly and the induced draft fan using the same as claimed in claim 8, characterized in that: The limiting component includes a rod (39) fixedly connected to one side of the annular housing (31), and a plurality of slots (40) matching the rod (39) are equidistantly arranged in a circular array on one side of the knob (36), and the corners of the inner wall of the slots (40) at the opening are all chamfered.

10. The induced draft fan volute assembly and the induced draft fan using the same as claimed in claim 9, characterized in that: A magnet (41) is fixedly connected to the end of the insertion rod (39) away from the annular shell (31), and iron pieces (42) that attract the magnet (41) are fixedly connected inside the slot (40).

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