Centrifugal fan capable of preventing internal air from flowing back

Abstract

The utility model relates to the technical field of centrifugal fans, and discloses a centrifugal fan capable of preventing internal air from flowing back, which comprises a mounting plate, two bottom plates are fixedly mounted at the top of the mounting plate, a shell is fixedly mounted at the tops of the bottom plates, an air inlet is formed in the back of the shell, a conveying mechanism is arranged in the shell, and the conveying mechanism is fixedly mounted on the mounting plate. An anti-vibration mechanism is arranged outside the mounting plate, external air enters the shell through the air inlet through rotation of the impeller, the flow direction of air is determined through rotation of the blades, the air sucked by rotation of the impeller is exhausted through the air outlet pipe, the problem that backflow exists in the air in the shell is solved, noise generated by the centrifugal fan is reduced through sound absorption cotton, and the noise reduction effect is good. And the spring A drives the baffle to move, so that when the device is not used, external gas is prevented from flowing into the shell, the spring B is compressed to absorb vibration force, the purpose of damping is achieved, and noise is reduced while the service life of the device is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal fans, in particular to a centrifugal fan capable of preventing internal air from flowing back. Background Art

[0002] Centrifugal fans are machines that rely on input mechanical energy to increase gas pressure and discharge gas. They are widely used in power plants, mines and other industries.

[0003] According to a centrifugal fan for preventing internal air backflow disclosed on the patent website (authorization announcement number: CN212717234U), "The utility model discloses a centrifugal fan for preventing internal air backflow, including a support base, a shell and a drive motor are installed on the upper surface of the support base, and a driving pulley is installed on the output shaft of the drive motor. The driving pulley is connected to the driven pulley through a transmission belt, and the driven pulley is installed on one end of the fourth rotating shaft. The other end of the fourth rotating shaft passes through the second bearing on the shell and is connected to the impeller, and the impeller is located inside the shell. The utility model solves the problem that the air inhaled by the existing centrifugal fan has a backflow inside the shell, that is, it cannot be completely discharged from the air outlet, which affects the working efficiency of the centrifugal fan, and a large amount of air is inhaled into the centrifugal fan, causing the body to shake, generating huge noise, and bothering the surrounding staff; the utility model has a simple structure, avoids the backflow of the air inhaled by the utility model inside the shell, reduces noise, and has strong practicality."

[0004] In view of the above description, the applicant believes that there are the following problems:

[0005] During use, the utility model uses a series of structures to coordinate and arrange the blades so that the wind inside the shell of the utility model can be discharged from the air outlet. The rotation of the blades is equivalent to the operation of a fan, which determines the direction of the wind and guides the wind inside the shell to be discharged from the air outlet. The utility model solves the problem of backflow of air sucked in by the existing centrifugal fan inside the shell. However, in actual use, when the device is stopped, the transported gas may flow back into the air outlet and enter the shell to run around, causing the impeller to drive the drive motor to reverse and cause certain damage. The transported gas is discharged through the air inlet, and the efficiency of transporting the gas becomes low. Secondly, the impeller will generate strong vibration and noise when rotating, which will damage the parts inside the device and shorten the service life of the device. Therefore, it is necessary to improve a centrifugal fan that prevents internal air backflow to solve the above problems. Utility Model Content

[0006] The utility model aims to provide a centrifugal fan for preventing internal air backflow, so as to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a centrifugal fan for preventing internal air backflow, comprising a mounting plate, two bottom plates are fixedly mounted on the top of the mounting plate, a shell is fixedly mounted on the top of the bottom plate, an air inlet is opened on the back of the shell, a conveying mechanism is arranged inside the shell, and a shockproof mechanism is arranged outside the mounting plate.

[0008] The conveying mechanism comprises an anti-backflow component and an anti-reflow component. The anti-backflow component is arranged inside the shell, and the anti-reflow component is arranged on the top of the shell.

[0009] Preferably, the anti-backflow component includes a motor, which is fixedly mounted on the front side of the shell, a rotating shaft A is fixedly mounted on the output end of the motor, an impeller is fixedly mounted on the end of the rotating shaft A away from the motor, a rotating ring is fixedly mounted on the front side of the impeller, a leather pulley A is fixedly mounted on the outside of the rotating shaft A, a belt is installed on the external transmission of the leather pulley A, a rotating shaft B is rotatably mounted inside the shell, a leather pulley B is fixedly mounted on the outside of the rotating shaft B, a bevel gear A is fixedly mounted on the back of the rotating shaft B, a bump A is fixedly mounted inside the shell, a rotating shaft C is rotatably mounted inside the bump A, a bevel gear B is fixedly mounted on the top of the rotating shaft C, and a blade is fixedly mounted on the bottom of the rotating shaft C to determine the direction of wind flow.

[0010] Preferably, the bevel gear B is meshed with the bevel gear A, the end of the belt away from the pulley A is transmission-mounted on the outside of the pulley B, the rotating shaft A is rotatably mounted inside the shell, the impeller corresponds to the air inlet, and the rotating ring is rotatably mounted inside the shell, so that the rotation of the impeller is smoother and the noise is smaller.

[0011] Preferably, the anti-backflow component includes an air outlet pipe, which is fixedly installed on the top of the shell, and sound-absorbing cotton is arranged inside the air outlet pipe. Two springs A are fixedly installed inside the air outlet pipe, and anti-slip sheets are fixedly installed on the ends of the two springs A away from the air outlet pipe. A connecting column is fixedly installed on the top of the anti-slip sheet, and a baffle is fixedly installed on the top of the connecting column. When not in use, the device prevents external gas from flowing into the interior of the shell.

[0012] Preferably, the connecting column is slidably installed inside the air outlet pipe, a through hole is opened inside the sound-absorbing cotton, and the anti-slip sheet is slidably installed inside the air outlet pipe to drive the connecting column to move.

[0013] Preferably, the anti-vibration mechanism includes a base, which is slidably mounted on the outside of a mounting plate, rectangular blocks are fixedly mounted on the left and right sides of the mounting plate, four protrusions B are fixedly mounted on the bottom of the mounting plate, and rotating rods are rotatably mounted inside the four protrusions B, four springs B are fixedly mounted inside the base, and sliders are fixedly mounted on the ends of the four springs B away from the base, and a protrusion C is fixedly mounted on the top of the slider and mounted on the rotating rod.

[0014] Preferably, the end of the rotating rod away from the protrusion B is rotatably installed inside the protrusion C, the sliding block is slidably installed inside the base, and the rectangular block is slidably installed inside the base to limit the movement of the mounting plate.

[0015] Compared with the prior art, the utility model provides a centrifugal fan for preventing internal air backflow, which has the following beneficial effects:

[0016] 1. The centrifugal fan for preventing internal air backflow has a conveying mechanism set up. During use, the impeller rotates to allow outside air to enter the inside of the casing through the air inlet. The rotation of the blades is equivalent to the operation of a fan, which determines the direction of the wind, so that the wind sucked in by the rotation of the impeller is discharged through the air outlet pipe, which solves the problem of wind backflow inside the casing. The plane of the sound-absorbing cotton no longer reflects sound waves, thereby reducing the noise generated by the centrifugal fan. The spring A drives the baffle to move, so that when the device is not in use, it prevents external gas from flowing into the inside of the casing.

[0017] 2. The centrifugal fan for preventing internal air backflow has an anti-vibration mechanism. During use, the mounting plate slides in the base, and the protrusion C drives the slider to slide inside the base, so that the spring B is compressed to absorb the vibration force, thereby achieving the purpose of shock reduction, extending the service life of the device and reducing noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative labor:

[0019] Figure 1 This is a schematic diagram of the appearance structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the conveying mechanism of the utility model;

[0022] Figure 4 This is a schematic diagram of the exploded structure of the backflow prevention component of the utility model;

[0023] Figure 5 It is a schematic diagram of the exploded structure of the shockproof mechanism of the utility model.

[0024] In the figure: 1. mounting plate; 2. bottom plate; 3. shell; 4. air inlet; 5. conveying mechanism; 51. backflow prevention assembly; 511. motor; 512. rotating shaft A; 513. impeller; 514. rotating ring; 515. pulley A; 516. belt; 517. rotating shaft B; 518. pulley B; 519. bevel gear A; 5110. bump A; 5111. rotating shaft C; 5112. bevel gear B; 5113. blade; 52. backflow prevention assembly; 521. air outlet pipe; 522. sound-absorbing cotton; 523. spring A; 524. anti-slip sheet; 525. connecting column; 526. baffle; 6. anti-vibration mechanism; 61. base; 62. rectangular block; 63. bump B; 64. rotating rod; 65. spring B; 66. slider; 67. bump C. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Embodiment 1:

[0028] See also Figure 1-4 The utility model provides a technical solution: a centrifugal fan for preventing internal air backflow, comprising a mounting plate 1, two bottom plates 2 are fixedly mounted on the top of the mounting plate 1, a shell 3 is fixedly mounted on the top of the bottom plate 2, an air inlet 4 is opened on the back of the shell 3, a conveying mechanism 5 is arranged inside the shell 3, and a shockproof mechanism 6 is arranged outside the mounting plate 1.

[0029] The conveying mechanism 5 includes an anti-backflow component 51 and an anti-backflow component 52 . The anti-backflow component 51 is arranged inside the shell 3 , and the anti-backflow component 52 is arranged on the top of the shell 3 .

[0030] Furthermore, the backflow prevention component 51 includes a motor 511, which is fixedly mounted on the front side of the shell 3. A rotating shaft A512 is fixedly mounted on the output end of the motor 511. An impeller 513 is fixedly mounted on the end of the rotating shaft A512 away from the motor 511. A rotating ring 514 is fixedly mounted on the front side of the impeller 513. A leather pulley A515 is fixedly mounted on the outside of the rotating shaft A512. A belt 516 is installed on the external transmission of the leather pulley A515. A rotating shaft B517 is rotatably mounted inside the shell 3. A leather pulley B518 is fixedly mounted on the outside of the rotating shaft B517. A bevel gear A519 is fixedly mounted on the back of the rotating shaft B517. A protrusion A5110 is fixedly mounted inside the shell 3. A rotating shaft C5111 is rotatably mounted inside the protrusion A5110. A bevel gear B5112 is fixedly mounted on the top of the rotating shaft C5111. A blade 5113 is fixedly mounted on the bottom of the rotating shaft C5111 to determine the direction of wind flow.

[0031] Furthermore, the bevel gear B5112 is meshed with the bevel gear A519, the end of the belt 516 away from the pulley A515 is installed on the outside of the pulley B518, the rotating shaft A512 is rotatably installed inside the shell 3, the impeller 513 corresponds to the air inlet 4, and the rotating ring 514 is rotatably installed inside the shell 3, so that the rotation of the impeller 513 is smoother and the noise is smaller.

[0032] Furthermore, the backflow prevention component 52 includes an air outlet pipe 521, which is fixedly installed on the top of the shell 3. Sound-absorbing cotton 522 is arranged inside the air outlet pipe 521. Two springs A523 are fixedly installed inside the air outlet pipe 521. Anti-slip plates 524 are fixedly installed on one end of the two springs A523 away from the air outlet pipe 521. A connecting column 525 is fixedly installed on the top of the anti-slip plate 524. A baffle 526 is fixedly installed on the top of the connecting column 525. When not in use, the device prevents external gas from flowing into the interior of the shell 3.

[0033] Furthermore, the connecting column 525 is slidably installed inside the air outlet pipe 521, a through hole is opened inside the sound-absorbing cotton 522, and the anti-slip sheet 524 is slidably installed inside the air outlet pipe 521, driving the connecting column 525 to move.

[0034] Embodiment two:

[0035] See also Figure 5, and combined with Example 1, it is further obtained that the shockproof mechanism 6 includes a base 61, the base 61 is slidably installed on the outside of the mounting plate 1, rectangular blocks 62 are fixedly installed on the left and right sides of the mounting plate 1, four protrusions B63 are fixedly installed on the bottom of the mounting plate 1, and rotating rods 64 are rotatably installed inside the four protrusions B63, four springs B65 are fixedly installed inside the base 61, and sliders 66 are fixedly installed on the ends of the four springs B65 away from the base 61, and a protrusion C67 is fixedly installed on the top of the slider 66 and installed with the rotating rod 64.

[0036] Furthermore, one end of the rotating rod 64 away from the protrusion B63 is rotatably installed inside the protrusion C67, the slider 66 is slidably installed inside the base 61, and the rectangular block 62 is slidably installed inside the base 61 to limit the movement of the mounting plate 1.

[0037] In actual operation, when this device is used, the starting motor 511 drives the rotating shaft A512 to rotate, and the rotating shaft A512 drives the impeller 513 to rotate, so that the outside air enters the shell 3 through the air inlet 4, and the rotating ring 514 makes the rotation of the impeller 513 more stable and the noise is smaller. The rotating shaft A512 drives the leather wheel A515 to rotate, so that the belt 516 drives the leather wheel B518 to rotate, so that the rotating shaft B517 rotates and drives the bevel gear A519 to rotate, and the bevel gear B5112 engages with the bevel gear A519, so that the rotating shaft C5111 drives the blade 5113 to rotate, and the rotation of the blade 5113 causes the air inside the shell 3 to be discharged through the air outlet pipe 521. The rotation of the blade 5113 is equivalent to the operation of a fan, which determines the direction of the wind, so that the wind sucked in by the rotation of the impeller 513 is discharged through the air outlet pipe 521, and the wind force is greater than the elastic force of the spring A523, so that the baffle 526 does not meet the outlet. The contact between the air duct 521 and the air outlet pipe 521 allows the air to be discharged, which solves the problem of wind backflow inside the shell 3. A large amount of air enters the shell 3, causing the shell 3 to shake, causing the mounting plate 1 to slide inside the base 61, so that the protrusion B63 is close to the protrusion C67, so that the protrusion C67 drives the slider 66 to slide inside the base 61, so that the spring B65 is compressed to absorb the vibration force, thereby achieving the purpose of shock absorption. When the sound waves generated inside the shell 3 reach the sound-absorbing cotton 522 installed on the inside of the air outlet pipe 521, the sound-absorbing cotton 522 buffers and absorbs the sound waves, so that no sound waves are reflected from the plane of the sound-absorbing cotton 522, thereby reducing the noise generated by the centrifugal fan. When the device stops using, the wind force disappears, and the spring A523 rebounds to drive the anti-slip sheet 524 to descend, so that the connecting column 525 drives the baffle 526 to descend, and the baffle 526 fits with the air outlet pipe 521, thereby preventing the possibility of external gas flowing into the shell 3.

[0038] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

Claims

1. A centrifugal fan for preventing internal air backflow, comprising a mounting plate (1), characterized in that: Two bottom plates (2) are fixedly mounted on the top of the mounting plate (1); a shell (3) is fixedly mounted on the top of the bottom plate (2); an air inlet (4) is provided on the back of the shell (3); a conveying mechanism (5) is provided inside the shell (3); and an anti-vibration mechanism (6) is provided outside the mounting plate (1); The conveying mechanism (5) comprises an anti-backflow component (51) and an anti-backflow component (52); the anti-backflow component (51) is arranged inside the shell (3), and the anti-backflow component (52) is arranged on the top of the shell (3).

2. A centrifugal fan for preventing internal air backflow according to claim 1, characterized in that: The backflow prevention component (51) comprises a motor (511), the motor (511) is fixedly mounted on the front side of the housing (3), a rotating shaft A (512) is fixedly mounted on the output end of the motor (511), an impeller (513) is fixedly mounted on the end of the rotating shaft A (512) away from the motor (511), a rotating ring (514) is fixedly mounted on the front side of the impeller (513), a pulley A (515) is fixedly mounted on the outside of the rotating shaft A (512), a belt (516) is mounted on the outside of the pulley A (515), and the housing (3) is provided with a plurality of rotating shafts (512) and a plurality of rotating shafts (512) arranged on the housing (3). A rotating shaft B (517) is rotatably mounted inside (3), a pulley B (518) is fixedly mounted outside the rotating shaft B (517), a bevel gear A (519) is fixedly mounted on the back of the rotating shaft B (517), a protrusion A (5110) is fixedly mounted inside the housing (3), a rotating shaft C (5111) is rotatably mounted inside the protrusion A (5110), a bevel gear B (5112) is fixedly mounted on the top of the rotating shaft C (5111), and a blade (5113) is fixedly mounted on the bottom of the rotating shaft C (5111).

3. A centrifugal fan for preventing internal air backflow according to claim 2, characterized in that: The bevel gear B (5112) is meshed with the bevel gear A (519), the end of the belt (516) away from the pulley A (515) is transmission-mounted on the outside of the pulley B (518), the rotating shaft A (512) is rotatably mounted inside the shell (3), the impeller (513) corresponds to the air inlet (4), and the rotating ring (514) is rotatably mounted inside the shell (3).

4. A centrifugal fan for preventing internal air backflow according to claim 1, characterized in that: The anti-backflow component (52) comprises an air outlet pipe (521), the air outlet pipe (521) is fixedly mounted on the top of the shell (3), a sound-absorbing cotton (522) is arranged inside the air outlet pipe (521), two springs A (523) are fixedly mounted inside the air outlet pipe (521), an anti-slip sheet (524) is fixedly mounted on one end of the two springs A (523) away from the air outlet pipe (521), a connecting column (525) is fixedly mounted on the top of the anti-slip sheet (524), and a baffle (526) is fixedly mounted on the top of the connecting column (525).

5. A centrifugal fan for preventing internal air backflow according to claim 4, characterized in that: The connecting column (525) is slidably mounted inside the air outlet pipe (521), a through hole is provided inside the sound-absorbing cotton (522), and the anti-slip sheet (524) is slidably mounted inside the air outlet pipe (521).

6. A centrifugal fan for preventing internal air backflow according to claim 1, characterized in that: The anti-vibration mechanism (6) comprises a base (61), the base (61) is slidably mounted on the outside of the mounting plate (1), rectangular blocks (62) are fixedly mounted on the left and right sides of the mounting plate (1), four protrusions B (63) are fixedly mounted on the bottom of the mounting plate (1), rotating rods (64) are rotatably mounted inside the four protrusions B (63), four springs B (65) are fixedly mounted inside the base (61), and sliders (66) are fixedly mounted on the ends of the four springs B (65) away from the base (61), and a protrusion C (67) is fixedly mounted on the top of the slider (66).

7. A centrifugal fan for preventing internal air backflow according to claim 6, characterized in that: The end of the rotating rod (64) away from the protrusion B (63) is rotatably mounted inside the protrusion C (67), the sliding block (66) is slidably mounted inside the base (61), and the rectangular block (62) is slidably mounted inside the base (61).

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