CN216142940U - Negative pressure sealing device of centrifugal fan - Google Patents
Negative pressure sealing device of centrifugal fan Download PDFInfo
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- CN216142940U CN216142940U CN202122004637.6U CN202122004637U CN216142940U CN 216142940 U CN216142940 U CN 216142940U CN 202122004637 U CN202122004637 U CN 202122004637U CN 216142940 U CN216142940 U CN 216142940U
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- fixedly connected
- negative pressure
- fan shell
- sealing device
- centrifugal fan
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Abstract
The utility model discloses a centrifugal fan negative pressure sealing device, which relates to the technical field of centrifugal fan sealing devices and comprises a fan shell, wherein a driving motor is arranged on the back surface of the fan shell, the output end of the driving motor is fixedly connected with a rotating shaft, a sealing mechanism is arranged at the top of an inner cavity of the fan shell, a noise reduction mechanism is arranged at the bottom of the inner cavity of the fan shell, the sealing mechanism comprises a hinge block, a rocker is arranged on the front surface of the hinge block, a piston rod is movably connected below the rocker, and the noise reduction mechanism comprises a sound insulation cover. According to the centrifugal fan negative pressure sealing device, through the matching of the piston rod and the piston and by utilizing the principle of a gas damper, external gas flow is blocked when entering the interior of the fan shell, and is not blocked when moving reversely, so that the gas flow is difficult to enter and easy to discharge, the damage of internal parts of the device caused by the backflow of gas at an air outlet is avoided, and the service life of the device is prolonged.
Description
Technical Field
The utility model relates to the technical field of centrifugal fan sealing devices, in particular to a centrifugal fan negative pressure sealing device.
Background
Centrifugal fans are machines that increase the pressure of gas and discharge the gas by means of mechanical energy input, and are widely used for ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings, ventilation and draft of boilers and industrial furnaces, and the like.
The following problems exist in the prior art:
1. in the existing centrifugal fan, if the air outlet is subjected to opposite air flow, larger resistance can be generated to form certain negative pressure, so that impurities at the air outlet are rewound into the fan, the damage to parts in the fan is caused, and the service life of the fan is shortened;
2. the current centrifugal fan is at drive arrangement during operation, and the periodic spiral case of patting of impeller to and the influence of export air current direction produce continuous noise, lead to staff's physical and mental health to receive serious influence, the vibration still can cause the life reduction of fan.
SUMMERY OF THE UTILITY MODEL
The utility model provides a negative pressure sealing device of a centrifugal fan, which aims to achieve better sealing capability of an air outlet and solve the problem of negative pressure gas backflow of the air outlet; the other purpose is to solve the problem of large noise when the equipment works so as to achieve the effect of reducing the noise of the equipment.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows:
the negative pressure sealing device for the centrifugal fan comprises a fan shell, wherein a driving motor is arranged on the back face of the fan shell, a rotating shaft is fixedly connected to the output end of the driving motor, a sealing mechanism is arranged at the top of an inner cavity of the fan shell, and a noise reduction mechanism is arranged at the bottom of the inner cavity of the fan shell.
The sealing mechanism comprises a hinge block, a rocker is arranged on the front side of the hinge block, and a piston rod is movably connected below the rocker.
The noise reduction mechanism comprises a sound-proof shield, blades are arranged inside the sound-proof shield, and a thermal plastic film is fixedly connected to the inner wall of the sound-proof shield.
The technical scheme of the utility model is further improved as follows: the top of rocker is provided with sealed the pad, the inner chamber lateral wall fixedly connected with filter of fan shell, the bottom fixedly connected with gas pitcher of filter.
By adopting the technical scheme, the hinge block and the rocker in the scheme are matched together, so that the air outlet can be sealed.
The technical scheme of the utility model is further improved as follows: the bottom fixedly connected with piston of piston rod, the outside swing joint of piston rod has the through-hole board, the outside of through-hole board and the inside fixed connection of filter.
By adopting the technical scheme, the piston rod, the through hole plate and the through hole plate in the scheme are matched together, and the rocker can be propped against the inner energy of the gas in the gas tank to swing downwards.
The technical scheme of the utility model is further improved as follows: the inside of sound-proof housing is provided with the impeller, the inside of impeller and the outside fixed connection of pivot, the front fixedly connected with amortization box of impeller.
By adopting the technical scheme, the rotating shaft and the impeller in the scheme are matched together, and mechanical energy can be provided for the device.
The technical scheme of the utility model is further improved as follows: the bottom of blade is provided with the spring, the below of spring is provided with the stopper, the one end of stopper and the outside fixed connection of blade.
By adopting the technical scheme, the springs and the limiting blocks in the scheme are matched together, so that the noise generated by the friction collision of the blades and the thermal plastic film is weakened.
The technical scheme of the utility model is further improved as follows: the top of fan shell is provided with the connecting plate, the bottom fixedly connected with base of fan shell, the lower fixed surface of base is connected with the shock attenuation platform.
By adopting the technical scheme, the base and the damping table in the scheme are matched together to buffer the external vibration of the fan shell and reduce noise.
The technical scheme of the utility model is further improved as follows: one side of the fan shell is provided with an air duct, one end of the air duct is fixedly connected with an exhaust pipe, and the bottom of the exhaust pipe is fixedly connected with the upper surface of the connecting plate.
By adopting the technical scheme, the air guide pipe and the exhaust pipe in the scheme are matched together, so that the pressure above the connecting plate can be reduced.
Due to the adoption of the technical scheme, compared with the prior art, the utility model has the technical progress that:
1. the utility model provides a centrifugal fan negative pressure sealing device, which is characterized in that through the matching of a piston rod and a piston and by utilizing the principle of a gas damper, external gas flow is blocked when entering the interior of a fan shell, and is not blocked when moving in a reverse direction, so that the gas flow is difficult to enter and easy to discharge, the damage of internal parts of the device caused by the backflow of gas at an air outlet is avoided, and the service life of the device is prolonged.
2. The utility model provides a centrifugal fan negative pressure sealing device, which reduces impact collision between a blade and the inner wall of a fan shell when the blade rotates by matching a spring and a limiting block and arranging a thermal-resistant plastic film in a sound-proof cover, and simultaneously isolates noise from the outside by using the sound-proof cover, thereby reducing influence caused by the noise and prolonging the service life of the device.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic cross-sectional view of a structural sealing mechanism of the present invention;
FIG. 3 is an enlarged schematic view of the present invention at configuration A;
fig. 4 is a schematic partial cross-sectional view of a structural fan casing of the present invention.
In the figure: 1. a fan housing; 11. a drive motor; 12. a rotating shaft; 13. a connecting plate; 14. a base; 15. a damping table;
2. a sealing mechanism; 21. hinging the block; 22. a rocker; 23. a piston rod; 231. a through hole plate; 232. a piston; 24. a filter plate; 25. a gas tank; 26. an air duct; 261. an exhaust pipe;
3. a noise reduction mechanism; 31. a sound-proof housing; 32. a heat resistant plastic film; 33. an impeller; 34. a blade; 341. a spring; 342. and a limiting block.
Detailed Description
The present invention will be described in further detail with reference to the following examples:
example 1
As shown in fig. 1-4, the utility model provides a centrifugal fan negative pressure sealing device, which comprises a fan shell 1, wherein a driving motor 11 is arranged on the back of the fan shell 1, an output end of the driving motor 11 is fixedly connected with a rotating shaft 12, a sealing mechanism 2 is arranged at the top of an inner cavity of the fan shell 1, a noise reduction mechanism 3 is arranged at the bottom of the inner cavity of the fan shell 1, the sealing mechanism 2 comprises a hinge block 21, a rocker 22 is arranged on the front of the hinge block 21, a piston rod 23 is movably connected below the rocker 22, the noise reduction mechanism 3 comprises a sound-proof cover 31, blades 34 are arranged inside the sound-proof cover 31, and a thermal plastic film 32 is fixedly connected to the inner wall of the sound-proof cover 31.
In this embodiment, the rocker 22 is supported by the piston rod 23, and the principle of the pneumatic damper is utilized, so that the obstruction of inward airflow is increased, the sealing performance of the device is improved, and meanwhile, the noise generated inside the fan casing 1 is isolated from the outside by matching with the sound-proof cover 31, and the influence of the surrounding environment where the excessive noise is transmitted is avoided.
Example 2
As shown in fig. 1 to 4, on the basis of embodiment 1, the present invention provides a technical solution: preferably, the top of rocker 22 is provided with sealed the pad, the inner chamber lateral wall fixedly connected with filter 24 of fan shell 1, the bottom fixedly connected with gas pitcher 25 of filter 24, the bottom fixedly connected with piston 232 of piston rod 23, the outside swing joint of piston rod 23 has through-hole board 231, the outside of through-hole board 231 and the inside fixed connection of filter 24, one side of fan shell 1 is provided with air duct 26, the one end fixedly connected with blast pipe 261 of air duct 26, the bottom of blast pipe 261 and the last fixed surface of connecting plate 13 are connected.
In this embodiment, on the basis of atmospheric pressure bumper shock absorber principle, ventilate the top of gas pitcher 25, the bottom is sealed, and then receives the hindrance of the gaseous internal energy in gas pitcher 25 bottom when external air current gets into the inside of fan shell 1, and because the effect of the top through-hole board 231 of gas pitcher 25 does not have the resistance when inside air current is discharged, avoids the negative pressure internal flow of air current.
Example 3
As shown in fig. 1 to 4, on the basis of embodiment 1, the present invention provides a technical solution: preferably, an impeller 33 is arranged inside the soundproof cover 31, the inside of the impeller 33 is fixedly connected with the outer side of the rotating shaft 12, a silencing box is fixedly connected to the front side of the impeller 33, a spring 341 is arranged at the bottom of the blade 34, a limiting block 342 is arranged below the spring 341, one end of the limiting block 342 is fixedly connected with the outer side of the blade 34, a connecting plate 13 is arranged at the top of the fan casing 1, a base 14 is fixedly connected to the bottom of the fan casing 1, and a damping table 15 is fixedly connected to the lower surface of the base 14.
In this embodiment, the spring 341 is disposed at the bottom of the blade 34, so that when the blade 34 rotates rapidly in a reciprocating manner, the impact friction with the inside of the fan casing 1 is buffered and weakened, and meanwhile, the sound-proof cover 31 is disposed on a propagation path of noise to isolate the noise from the outside, so that the influence of excessive noise on the outside environment is avoided, and meanwhile, the damping table 15 can reduce the overall vibration and prolong the service life of the device.
The working principle of the centrifugal fan negative pressure sealing device is described in detail below.
As shown in fig. 1-4, the user actuating device, on the basis of the air pressure damper principle, ventilate the top of the air tank 25, the bottom is sealed, and then the outside air current receives the gaseous hindrance in air tank 25 bottom when getting into the inside of the fan casing 1, and the inside air current is discharged because of the effect of the top through hole plate 231 of the air tank 25, there is not resistance, through being provided with spring 341 in the bottom of blade 34, when the quick reciprocating rotation of blade 34, will cushion with the impact friction of the inside of fan casing 1 and weaken, set up sound-proof housing 31 on the propagation path of noise and keep apart it with the external world simultaneously, avoid too big noise to produce.
The present invention has been described in general terms in the foregoing, but it will be apparent to those skilled in the art that modifications and improvements can be made thereto based on the present invention. Therefore, modifications or improvements are within the scope of the utility model without departing from the spirit of the inventive concept.
Claims (7)
1. The utility model provides a centrifugal fan negative pressure sealing device, includes fan shell (1), the back of fan shell (1) is provided with driving motor (11), the output fixedly connected with pivot (12) of driving motor (11), its characterized in that: the top of the inner cavity of the fan shell (1) is provided with a sealing mechanism (2), and the bottom of the inner cavity of the fan shell (1) is provided with a noise reduction mechanism (3);
the sealing mechanism (2) comprises a hinge block (21), a rocker (22) is arranged on the front surface of the hinge block (21), and a piston rod (23) is movably connected below the rocker (22);
the noise reduction mechanism (3) comprises a sound insulation cover (31), blades (34) are arranged inside the sound insulation cover (31), and a thermal plastic resistant film (32) is fixedly connected to the inner wall of the sound insulation cover (31).
2. The centrifugal fan negative pressure sealing device of claim 1, wherein: the top of rocker (22) is provided with sealed the pad, the inner chamber lateral wall fixedly connected with filter (24) of fan shell (1), the bottom fixedly connected with gas pitcher (25) of filter (24).
3. The centrifugal fan negative pressure sealing device of claim 2, wherein: the bottom fixedly connected with piston (232) of piston rod (23), the outside swing joint of piston rod (23) has through-hole board (231), the outside of through-hole board (231) and the inside fixed connection of filter (24).
4. The centrifugal fan negative pressure sealing device of claim 1, wherein: an impeller (33) is arranged in the soundproof cover (31), the inside of the impeller (33) is fixedly connected with the outer side of the rotating shaft (12), and the front side of the impeller (33) is fixedly connected with a silencing box.
5. The centrifugal fan negative pressure sealing device of claim 1, wherein: the bottom of blade (34) is provided with spring (341), the below of spring (341) is provided with stopper (342), the outside fixed connection of one end and blade (34) of stopper (342).
6. The centrifugal fan negative pressure sealing device of claim 1, wherein: the top of fan shell (1) is provided with connecting plate (13), the bottom fixedly connected with base (14) of fan shell (1), the lower fixed surface of base (14) is connected with shock attenuation platform (15).
7. The centrifugal fan negative pressure sealing device of claim 6, wherein: one side of the fan shell (1) is provided with an air duct (26), one end of the air duct (26) is fixedly connected with an exhaust pipe (261), and the bottom of the exhaust pipe (261) is fixedly connected with the upper surface of the connecting plate (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122004637.6U CN216142940U (en) | 2021-08-24 | 2021-08-24 | Negative pressure sealing device of centrifugal fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122004637.6U CN216142940U (en) | 2021-08-24 | 2021-08-24 | Negative pressure sealing device of centrifugal fan |
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| Publication Number | Publication Date |
|---|---|
| CN216142940U true CN216142940U (en) | 2022-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122004637.6U Active CN216142940U (en) | 2021-08-24 | 2021-08-24 | Negative pressure sealing device of centrifugal fan |
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| CN (1) | CN216142940U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116608137A (en) * | 2023-04-28 | 2023-08-18 | 广东鑫风风机有限公司 | Centrifugal fan with energy recovery function |
-
2021
- 2021-08-24 CN CN202122004637.6U patent/CN216142940U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116608137A (en) * | 2023-04-28 | 2023-08-18 | 广东鑫风风机有限公司 | Centrifugal fan with energy recovery function |
| CN116608137B (en) * | 2023-04-28 | 2024-03-26 | 广东鑫风风机有限公司 | Centrifugal fan with energy recovery function |
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