Built-in filtering type negative pressure air suspension centrifugal blower

Abstract

The invention relates to the technical field of air suspension fans, and provides a built-in filtering type negative pressure air suspension centrifugal blower which comprises a shell, a negative pressure fan is detachably connected to the interior of the shell, the air inlet end of the negative pressure fan is detachably connected with an air inlet pipeline, and the other end of the air inlet pipeline is fixedly connected with a separation structure through a screw. One end of the negative pressure fan is fixedly connected with a volute, one end of the volute is fixedly connected with an outlet silencer, and the air outlet end of the negative pressure fan is fixedly connected with an air cooling outlet pipe. By means of the technical scheme, the problems that in an existing air suspension air blower, inlet air of a negative-pressure fan usually contains paper scraps, fibers and other particularly fine impurities or a large amount of dust, a traditional air filter is prone to being blocked, and the air inlet performance of the fan is affected are solved; when the filter element is not used, impurities such as paper scraps can enter the fan, heat dissipation of an air bearing is affected, bearing gaps can be blocked in severe cases, the fan rubs wheels due to bearing failure, and better use prospects can be brought.

Description

Technical Field

[0001] The invention relates to the technical field of air-suspended blowers, and in particular to a built-in filtered negative-pressure air-suspended centrifugal blower. Background Art

[0002] The air suspension centrifugal blower adopts three technologies: ultra-high-speed direct-connected motor, air suspension bearing and high-precision single-stage centrifugal impeller, which has the advantages of high efficiency, high performance, low noise and low energy consumption; After searching, the authorization announcement number is CN112228361B, which is an air suspension centrifugal blower. The invention has the advantages of compact structure, high efficiency, long life, good stability, high start and stop times, and low motor temperature rise; However, the negative pressure fan intake air in the existing air suspension blower often contains very fine impurities such as paper scraps and fibers, or a very large amount of dust. The traditional air filter is prone to blockage, affecting the air intake performance of the fan. If no filter element is used, impurities such as paper scraps may enter the fan, affecting the heat dissipation of the air bearing, etc. In severe cases, the bearing gap may be blocked, causing the bearing to fail and leading to faults such as fan rubbing against the wheel. For this reason, we propose a built-in filtered negative pressure air suspension centrifugal blower. Summary of the invention

[0003] The present invention proposes a built-in filtered negative pressure air suspension centrifugal blower, which solves the problem mentioned in the background technology that the negative pressure fan intake air in the existing air suspension blower often carries extremely fine impurities such as paper scraps and fibers, or extremely large amounts of dust, which is easily clogged when using a traditional air filter, affecting the air intake performance of the fan; if no filter element is used, impurities such as paper scraps may enter the fan, affecting the heat dissipation of the air bearing, and in severe cases, the bearing gap may be blocked, causing the bearing to fail and leading to malfunctions such as fan wheel rubbing.

[0004] The technical solution of the present invention is as follows: A built-in filtering negative pressure air suspension centrifugal blower comprises a shell, a negative pressure blower is detachably connected inside the shell, an air inlet end of the negative pressure blower is detachably connected to an air inlet pipe, the other end of the air inlet pipe is fixedly connected to a separation structure by screws, one end of the negative pressure blower is fixedly connected to a volute, one end of the volute is fixedly connected to an outlet muffler, and an air outlet end of the negative pressure blower is fixedly connected to an air cooling outlet pipe; The separation structure includes a cyclone separator fixedly connected to the outer surface of the shell, the lower end of the cyclone separator is detachably connected to a dust collecting bucket, the outer surface of the cyclone separator is fixedly connected to an air inlet pipe, and one end of the air inlet pipe extending into the cyclone separator is fixedly connected to an extension portion.

[0005] As a further technical solution of the present invention, an adjustment structure is provided on the outer surface of the air inlet pipe, and the adjustment structure includes a No. 1 rotating shaft rotatably arranged inside the air inlet pipe, the outer surface of the No. 1 rotating shaft is fixedly connected to a driven gear, the outer surface of the driven gear is meshingly connected to a driving gear, and a through opening is opened on the outer surface of the driven gear, one end of the No. 1 rotating shaft is movably connected to the No. 2 rotating shaft, and the interior of the air inlet pipe is rotatably connected to the No. 3 rotating shaft, the outer surface of the No. 2 rotating shaft is fixedly connected to a No. 1 blade, the outer surface of the No. 3 rotating shaft is fixedly connected to a No. 2 blade, a movable bracket is connected between the No. 2 rotating shaft and the inner wall of the air inlet pipe, the No. 1 bracket is connected between the No. 3 rotating shaft and the inner wall of the air inlet pipe, and the No. 2 bracket is connected between the No. 1 rotating shaft and the air inlet pipe.

[0006] As a further technical solution of the present invention, a sliding groove is provided on the inner wall of the air inlet pipe corresponding to the end of the movable bracket, and a protrusion that can slide on the inside of the sliding groove is fixedly connected to the end of the movable bracket. A guide groove is provided on the outer surface of one end of the No. 1 rotating shaft close to the No. 2 rotating shaft, and a fixing column is fixedly connected to the outer surface of the No. 2 rotating shaft close to one end of the No. 1 rotating shaft, and a connecting spring is connected between the fixing column and the inner wall of the No. 1 rotating shaft, and a variable frequency motor is fixedly connected to the outer surface of the air inlet pipe corresponding to the driving gear, a clamping groove is provided on the end surface of the No. 3 rotating shaft close to the No. 2 rotating shaft, and a clamping block is fixedly connected to the end surface of the No. 2 rotating shaft close to the No. 3 rotating shaft.

[0007] As a further technical solution of the present invention, the lower end of the cyclone separator is an inverted cone-like structure, the cyclone separator is used to form a swirl of incoming air, the dust collecting bucket is used to collect the generated dust and other fine foreign matter, and the lower end of the extended part is higher than the height of the cone range of the cyclone separator.

[0008] As a further technical solution of the present invention, the dust collecting bucket is movably connected to the outer shell by screws, the air inlet direction of the air inlet pipe is tangent to the cyclone separator, and the air inlet pipe is used to provide a rotatable airflow to the interior of the cyclone separator.

[0009] As a further technical solution of the present invention, the No. 1 rotating shaft is located at the axis center of the air inlet duct, the No. 2 bracket is fixedly connected to the air inlet duct, the No. 1 rotating shaft is rotatably connected with the No. 2 bracket via a bearing, the No. 1 bracket is fixedly connected to the air inlet duct, and the No. 3 rotating shaft is rotatably connected with the No. 1 bracket via a bearing.

[0010] As a further technical solution of the present invention, the axes of the No. 3 rotating shaft, the No. 2 rotating shaft and the No. 1 rotating shaft all coincide with each other, the number of the through openings is several groups and distributed in a ring array, the number of the No. 2 blades and movable brackets are several groups and distributed in a ring array, and the driving gear is used to drive the driven gear to rotate.

[0011] As a further technical solution of the present invention, the movable bracket slides together with the protrusion along the length direction of the slide groove, and a rotational connection is formed between the movable bracket and the No. 2 rotating shaft through a bearing. The connecting spring is arranged along the length direction of the No. 1 rotating shaft, and the elastic end ends of the connecting spring are respectively fixedly connected to the fixed column and the inner wall of the No. 1 rotating shaft.

[0012] As a further technical solution of the present invention, one end of the fixed column matches the guide groove, the fixed column slides along the length direction of the guide groove, the card slot is a concave opening structure of a regular quadrangular prism, and the card block is a regular quadrangular prism structure.

[0013] As a further technical solution of the present invention, the side length of the square at one end of the card block is smaller than the side length of the square at one end of the card slot, and the maximum length of the diagonal angle at one end of the card block is greater than the side length of the square at one end of the card slot.

[0014] The working principle and beneficial effects of the present invention are: Through the effect of the separation structure in the present invention, during use, the airflow entering the cyclone separator from the outside can be effectively formed into a rotating airflow, and through the centrifugal effect, the fine dust and foreign matter entrained in the rotating airflow are effectively accumulated and fall into the dust collecting bin under the action of gravity and the momentum of the lower axial velocity, and the dust is collected through the dust collecting bin. At the same time, extending the lower end of the air inlet duct by the extension part can make the swirl formation effect better, thereby preventing abnormal wear of the air bearing inside the negative pressure fan due to excessive dust or abnormal heat dissipation, and preventing its operation from being caused by extremely fine impurities such as paper scraps and fibers. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] Figure 1 It is a structural schematic diagram of the built-in filtering negative pressure air suspension centrifugal blower of the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of the local structure from another perspective; Figure 3 It is a schematic diagram of a local structure cut away at the separation structure of the present invention; Figure 4 It is a partial structural schematic diagram of a cutaway portion of an air inlet pipe of the present invention; Figure 5 It is a schematic diagram of a local structure cut away at the regulating structure of the present invention; Figure 6 For the present invention Figure 5 Schematic diagram of partial structure with partial cutaway and enlargement; Figure 7 For the present invention Figure 6 Schematic diagram of the local structure at the chute; Figure 8 For the present invention Figure 6 A partial enlargement from another perspective.

[0017] In the figure: 1. casing; 2. negative pressure fan; 3. air inlet duct; 4. separation structure; 41. cyclone separator; 42. air inlet duct; 43. dust collecting bucket; 44. extension part; 5. adjustment structure; 51. shaft No. 1; 52. driven gear; 53. driving gear; 54. through-hole; 55. shaft No. 2; 56. shaft No. 3; 57. blade No. 1; 58. blade No. 2; 59. movable bracket; 510. bracket No. 1; 511. bracket No. 2; 512. slide groove; 513. convex block; 514. guide groove; 515. fixing column; 516. connecting spring; 517. frequency conversion motor; 518. slot; 519. block; 6. volute; 7. outlet silencer; 8. air cooling outlet pipe. DETAILED DESCRIPTION

[0018] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Meaning: Air bearing: A hydrodynamic air bearing is a sliding bearing that uses air as a lubricant. Its working principle is to use the hydrodynamic air film formed by air between the high-speed rotating rotor and the bearing to support and separate the contact surface between the shaft and the bearing, thereby reducing friction and wear.

[0020] Cyclone separator: Cyclone separator is a component used for separation of gas-solid system or liquid-solid system. The specific working principle is that the dust-laden airflow enters the cyclone separator from the air inlet pipe at a certain speed, and the airflow changes from linear motion to circular motion. The rotating airflow flows downward from the cylinder to the cone in a spiral shape along the wall of the device. The particles are thrown toward the wall under the action of centrifugal force, and fall along the wall with the momentum of the downward axial velocity near the wall surface, and enter the ash discharge bucket. The rotating and descending external vortex airflow continuously flows into the center part during the descent process, forming a centripetal radial airflow, forming a rotating upward internal vortex, and finally the purified gas is discharged to the fan inlet duct through the exhaust pipe.

[0021] Embodiment 1, as Figure 1~Figure 3As shown, this embodiment proposes a built-in filtering negative pressure air suspension centrifugal blower, including a shell 1, a negative pressure fan 2 is detachably connected inside the shell 1, an air inlet end of the negative pressure fan 2 is detachably connected to an air inlet pipe 3, the other end of the air inlet pipe 3 is fixedly connected to a separation structure 4 by screws, one end of the negative pressure fan 2 is fixedly connected to a volute 6, one end of the volute 6 is fixedly connected to an outlet muffler 7, and the air outlet end of the negative pressure fan 2 is fixedly connected to an air cooling outlet pipe 8; The separation structure 4 includes a cyclone separator 41 fixedly connected to the outer surface of the shell 1, the lower end of the cyclone separator 41 is detachably connected to a dust collecting bucket 43, the outer surface of the cyclone separator 41 is fixedly connected to an air inlet pipe 42, and one end of the air inlet pipe 3 extending into the cyclone separator 41 is fixedly connected to an extension part 44.

[0022] The lower end of the cyclone separator 41 is an inverted cone-like structure. The cyclone separator 41 is used to form a swirl of incoming air. The dust collecting bucket 43 is used to collect fine foreign matter such as generated dust. The lower end of the extension part 44 is higher than the height of the cone range of the cyclone separator 41.

[0023] The dust collecting barrel 43 is movably connected to the housing 1 via screws. The air inlet direction of the air inlet pipe 42 is tangential to the cyclone separator 41 . The air inlet pipe 42 is used to provide a rotatable airflow to the interior of the cyclone separator 41 .

[0024] In this embodiment, during use, the airflow entering the cyclone separator 41 from the outside can be effectively formed into a rotating airflow. Through the centrifugal effect, the fine dust and foreign matter entrained in the rotating airflow are effectively accumulated and fall into the dust collecting bin 43 under the action of gravity and the momentum of the lower axial velocity. The dust is collected by the dust collecting bin 43. At the same time, the lower end of the air inlet duct 3 is extended by the extension part 44, so that the effect of swirl formation can be better, thereby preventing abnormal wear of the air bearing inside the negative pressure fan 2 or abnormal heat dissipation due to excessive dust, and preventing its operation from being caused by particularly fine impurities such as paper scraps and fibers.

[0025] Embodiment 2, as Figure 4~Figure 8As shown, on the basis of Example 1, it is further proposed that the outer surface of the air inlet pipe 42 is provided with an adjustment structure 5, the adjustment structure 5 includes a No. 1 rotating shaft 51 rotatably arranged inside the air inlet pipe 42, the outer surface of the No. 1 rotating shaft 51 is fixedly connected with a driven gear 52, the outer surface of the driven gear 52 is meshingly connected with a driving gear 53, the outer surface of the driven gear 52 is provided with a through hole 54, one end of the No. 1 rotating shaft 51 is movably connected with a No. 2 rotating shaft 55, the inside of the air inlet pipe 42 is rotatably connected with a No. 3 rotating shaft 56, the outer surface of the No. 2 rotating shaft 55 is fixedly connected with a No. 1 blade 57, the outer surface of the No. 3 rotating shaft 56 is fixedly connected with a No. 2 blade 58, a movable bracket 59 is connected between the No. 2 rotating shaft 55 and the inner wall of the air inlet pipe 42, a No. 1 bracket 510 is connected between the No. 3 rotating shaft 56 and the inner wall of the air inlet pipe 42, and a No. 2 bracket 511 is connected between the No. 1 rotating shaft 51 and the air inlet pipe 42.

[0026] A slide groove 512 is provided on the inner wall of the air inlet pipe 42 corresponding to the end of the movable bracket 59, and a protrusion 513 that can slide on the inner side of the slide groove 512 is fixedly connected to the end of the movable bracket 59. A guide groove 514 is provided on the outer surface of one end of the No. 1 rotating shaft 51 close to the No. 2 rotating shaft 55, and a fixing column 515 is fixedly connected to the outer surface of the No. 2 rotating shaft 55 close to the end of the No. 1 rotating shaft 51, and a connecting spring 516 is connected between the fixing column 515 and the inner wall of the No. 1 rotating shaft 51. A frequency conversion motor 517 is fixedly connected to the outer surface of the air inlet pipe 42 corresponding to the driving gear 53, a clamping groove 518 is provided on the surface of one end of the No. 3 rotating shaft 56 close to the No. 2 rotating shaft 55, and a clamping block 519 is fixedly connected to the surface of one end of the No. 2 rotating shaft 55 close to the No. 3 rotating shaft 56.

[0027] The No. 1 rotating shaft 51 is located at the axis center of the air inlet pipe 42, the No. 2 bracket 511 is fixedly connected to the air inlet pipe 42, the No. 1 rotating shaft 51 is rotatably connected to the No. 2 bracket 511 through a bearing, the No. 1 bracket 510 is fixedly connected to the air inlet pipe 42, and the No. 3 rotating shaft 56 is rotatably connected to the No. 1 bracket 510 through a bearing.

[0028] The axes of the third rotating shaft 56, the second rotating shaft 55 and the first rotating shaft 51 are all coincident, the number of the through holes 54 is several groups and distributed in a ring array, the number of the second blades 58 and the movable brackets 59 are several groups and distributed in a ring array, and the driving gear 53 is used to drive the driven gear 52 to rotate.

[0029] The movable bracket 59 together with the protrusion 513 slides along the length direction of the slide groove 512, and a rotation connection is formed between the movable bracket 59 and the second rotating shaft 55 through a bearing. The connecting spring 516 is arranged along the length direction of the first rotating shaft 51, and the elastic ends of the connecting spring 516 are fixedly connected to the fixed column 515 and the inner wall of the first rotating shaft 51 respectively.

[0030] One end of the fixing column 515 matches with the guide groove 514 , and the fixing column 515 slides along the length direction of the guide groove 514 . The clamping groove 518 is a concave opening structure of a regular quadrangular prism, and the clamping block 519 is a regular quadrangular prism structure.

[0031] The side length of the square at one end of the block 519 is smaller than the side length of the square at one end of the slot 518 , and the maximum length of the diagonal angle at one end of the block 519 is greater than the side length of the square at one end of the slot 518 .

[0032] In this embodiment, the effect of generating a swirl inside the cyclone separator 41 can be further enhanced during the functioning of the separation structure 4, so that the wind force of the swirl can be greater, and thus it can be suitable for environments with large impurities in the air. It can be effectively used in outdoor construction sites with large dust or other environments with large air pollution. It can still be effectively used in harsh environments and will not cause abnormal wear of the air bearing or abnormal heat dissipation.

[0033] In summary, the working principle of the present invention is as follows: During use, the negative pressure fan 2 is first operated. Under the operation of the negative pressure fan 2, the airflow enters the interior of the cyclone separator 41 from the air inlet pipe 42. Under the action of the extension part 44, a rotating airflow is formed. When entering the lower half of the cyclone separator 41, the fine impurity particles or foreign matter carried by the airflow are thrown to the inner wall surface of the cyclone separator 41 under the action of centrifugal force, and fall along the wall surface by the momentum of the downward axial velocity near the inner wall surface of the cyclone separator 41, and are discharged into the interior of the dust collecting bucket 43. The rotating and descending external vortex airflow continuously flows into the central part during the descent process, forming a centripetal radial airflow, forming a rotating upward internal vortex flow, and finally the purified gas enters the interior of the air inlet pipe 3 through the extension part 44. The air inlet pipe 3 introduces the purified gas into the interior of the negative pressure fan 2. The noise generated by the operation of the negative pressure fan 2 can be offset by the outlet silencer 7. At the same time, the negative pressure fan 2 outputs the purified gas from the air-cooled outlet pipe 8 to the outside; During use, when the blower is used in some dusty areas, during normal operation, the variable frequency motor 517 can drive the driving gear 53 to rotate, and the protrusion 513 can drive the driven gear 52 to rotate accordingly, and the rotation of the driven gear 52 can drive the No. 1 rotating shaft 51 to rotate. During the rotation of the No. 1 rotating shaft 51, the No. 2 rotating shaft 55 together with the fixing column 515 can be driven to rotate accordingly, so that the No. 1 blade 57 rotates to blow air, and the airflow entering the air inlet pipe 42 has a stronger wind force. At this time, the swirl effect is better, and the better the swirl effect is, the better the centrifugal effect is, and the impurities in the airflow can be better removed and separated, so as to obtain clean gas, which will not affect the rotation of the air bearing inside the negative pressure blower 2. At the same time, the frequency conversion motor 517 can be controlled to enter the second gear, driving the driving gear 53 to rotate faster. At this time, the first shaft 51 drives the second shaft 55 to rotate faster. Under the action of wind, the second shaft 55 and the fixed column 515 will move away from the first shaft 51 during the rotation. At this time, the fixed column 515 and the first shaft 51 will stretch the connecting spring 516. During the rotation of the second shaft 55, the block 519 will be inserted into the inside of the card slot 518. At this time, the rotating second shaft 55 and the block 519 will drive The third rotating shaft 56 rotates accordingly, so that the second blade 58 also rotates accordingly, further increasing the velocity of the airflow blown into the cyclone separator 41 to better purify the airflow. During the sliding of the second rotating shaft 55, the rotation stability of the second rotating shaft 55 is maintained by the movable bracket 59. At the same time, the movable bracket 59 can slide along with the second rotating shaft 55. When one end of the block 519 is inserted into the opening of the slot 518 at one end of the third rotating shaft 56, the protrusion 513 just moves to the other end of the slide slot 512, and the use effect is better.

[0034] The present invention has a simple structure and occupies a small volume. It can ensure the filtering effect without causing the problem of air filter clogging. It has low process requirements and obvious filtering effect. The cyclone separator 41 is externally cleaned to make the filter barrel faster and more convenient.

[0035] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A built-in filtering negative pressure air suspension centrifugal blower, comprising a housing (1), characterized in that: The interior of the housing (1) is detachably connected to a negative pressure fan (2); the air inlet end of the negative pressure fan (2) is detachably connected to an air inlet duct (3); the other end of the air inlet duct (3) is fixedly connected to a separation structure (4) by means of screws; one end of the negative pressure fan (2) is fixedly connected to a volute (6); one end of the volute (6) is fixedly connected to an outlet muffler (7); and the air outlet end of the negative pressure fan (2) is fixedly connected to an air cooling outlet pipe (8); The separation structure (4) comprises a cyclone separator (41) fixedly connected to the outer surface of the housing (1); the lower end of the cyclone separator (41) is detachably connected to a dust collecting bucket (43); the outer surface of the cyclone separator (41) is fixedly connected to an air inlet pipe (42); and one end of the air inlet pipe (3) extending into the cyclone separator (41) is fixedly connected to an extension portion (44).

2. The built-in filtered negative pressure air suspension centrifugal blower according to claim 1, characterized in that: The outer surface of the air inlet pipe (42) is provided with an adjustment structure (5), the adjustment structure (5) comprising a first rotating shaft (51) rotatably arranged inside the air inlet pipe (42), the outer surface of the first rotating shaft (51) is fixedly connected to a driven gear (52), the outer surface of the driven gear (52) is meshingly connected to a driving gear (53), the outer surface of the driven gear (52) is provided with a through hole (54), one end of the first rotating shaft (51) is movably connected to a second rotating shaft (55), the air inlet pipe (42) ) is rotatably connected to a third rotating shaft (56) inside, a first blade (57) is fixedly connected to the outer surface of the second rotating shaft (55), a second blade (58) is fixedly connected to the outer surface of the third rotating shaft (56), a movable bracket (59) is connected between the second rotating shaft (55) and the inner wall of the air inlet pipe (42), a first bracket (510) is connected between the third rotating shaft (56) and the inner wall of the air inlet pipe (42), and a second bracket (511) is connected between the first rotating shaft (51) and the air inlet pipe (42).

3. The built-in filtering negative pressure air suspension centrifugal blower according to claim 2, characterized in that: A slide groove (512) is formed on the inner wall of the air inlet pipe (42) at the end of the movable bracket (59), and a protrusion (513) that can slide inside the slide groove (512) is fixedly connected to the end of the movable bracket (59). A guide groove (514) is formed on the outer surface of one end of the first rotating shaft (51) close to the second rotating shaft (55), and a fixing column (514) is fixedly connected to the outer surface of the second rotating shaft (55) close to the end of the first rotating shaft (51). 15), a connecting spring (516) is connected between the fixing column (515) and the inner wall of the first rotating shaft (51), a variable frequency motor (517) is fixedly connected to the outer surface of the air inlet pipe (42) corresponding to the driving gear (53), a clamping groove (518) is provided on one end surface of the third rotating shaft (56) close to the second rotating shaft (55), and a clamping block (519) is fixedly connected to one end surface of the second rotating shaft (55) close to the third rotating shaft (56).

4. The built-in filtered negative pressure air suspension centrifugal blower according to claim 1, characterized in that: The lower end of the cyclone separator (41) is an inverted cone-like structure. The cyclone separator (41) is used to form a swirl of incoming air. The dust collecting bucket (43) is used to collect generated dust and fine foreign matter. The lower end of the extended portion (44) is higher than the height of the cone range of the cyclone separator (41).

5. The built-in filtering negative pressure air suspension centrifugal blower according to claim 4, characterized in that: The dust collecting bucket (43) is movably connected to the outer shell (1) via screws; the air inlet direction of the air inlet pipe (42) is tangent to the cyclone separator (41); and the air inlet pipe (42) is used to provide a rotatable airflow to the interior of the cyclone separator (41).

6. The built-in filtering negative pressure air suspension centrifugal blower according to claim 2, characterized in that: The first rotating shaft (51) is located at the axis of the air inlet pipe (42), the second bracket (511) is fixedly connected to the air inlet pipe (42), the first rotating shaft (51) is rotatably connected to the second bracket (511) via a bearing, the first bracket (510) is fixedly connected to the air inlet pipe (42), and the third rotating shaft (56) is rotatably connected to the first bracket (510) via a bearing.

7. The built-in filtering negative pressure air suspension centrifugal blower according to claim 6, characterized in that: The axes of the third rotating shaft (56), the second rotating shaft (55) and the first rotating shaft (51) are all coincident, the number of the through openings (54) is a plurality of groups and they are distributed in a ring array, the number of the second blades (58) and the movable brackets (59) are a plurality of groups and they are distributed in a ring array, and the driving gear (53) is used to drive the driven gear (52) to rotate.

8. The built-in filtering negative pressure air suspension centrifugal blower according to claim 3, characterized in that: The movable bracket (59) together with the protrusion (513) slides along the length direction of the slide groove (512), and the movable bracket (59) is rotatably connected to the second rotating shaft (55) via a bearing. The connecting spring (516) is arranged along the length direction of the first rotating shaft (51), and the elastic ends of the connecting spring (516) are fixedly connected to the fixed column (515) and the inner wall of the first rotating shaft (51), respectively.

9. The built-in filtering negative pressure air suspension centrifugal blower according to claim 8, characterized in that: One end of the fixing column (515) matches the guide groove (514), the fixing column (515) slides along the length direction of the guide groove (514), the clamping groove (518) is a regular quadrangular prism-shaped concave opening structure, and the clamping block (519) is a regular quadrangular prism structure.

10. The internally filtered negative pressure air suspension centrifugal blower according to claim 9, characterized in that: The side length of the square at one end of the card block (519) is smaller than the side length of the square at one end of the card slot (518), and the maximum length of the diagonally opposite angle at one end of the card block (519) is greater than the side length of the square at one end of the card slot (518).

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