Noise reduction structure of centrifugal fan

Abstract

The utility model relates to the technical field of centrifugal fans, and discloses a centrifugal fan noise reduction structure which comprises a base, a fan is fixedly mounted at the top of the base, a motor is arranged on the outer wall of the right side of the fan, a mounting frame is fixedly mounted at the bottom of the motor, and the bottom end of the mounting frame is fixedly connected with the top of the base. A noise reduction mechanism is fixedly mounted on the outer wall of the base; the noise reduction mechanism comprises a sound insulation shell, a first silencing pipe, a second silencing pipe and a damping structure, the fan and the motor are covered with the sound insulation shell, the degree of outward emission of noise generated in the working process of the fan and the motor is reduced, the damping structure is arranged at the bottom of the base to conduct damping on vibration generated in the working process of the fan and the motor, and the noise reduction effect is improved. Meanwhile, the second silencing pipe is arranged at the air inlet of the draught fan, the first silencing pipe is arranged at the air outlet of the draught fan, airflow noise generated when the draught fan works is reduced, and noise reduction of the draught fan and the motor in multiple directions is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal fans, in particular to a noise reduction structure for a centrifugal fan. Background Art

[0002] A centrifugal fan is a machine that relies on input mechanical energy to increase gas pressure and discharge gas. It is a driven fluid machine. Centrifugal fans generate a lot of noise when working. The source of this noise is the vibration of the machine operation on the one hand, and the friction vibration generated when the airflow passes through the inner cavity of the centrifugal fan on the other hand. In the workshop, corresponding measures need to be taken to reduce the noise generated by the centrifugal fan and improve the working environment of the centrifugal fan;

[0003] The existing Chinese patent CN219509898U discloses a noise reduction structure for a centrifugal fan, which covers the motor part in a noise reduction box to reduce the vibration noise of the motor operation; the bottom of the fan housing is fastened and supported by a supporting component to reduce the vibration space and strengthen the stability, reduce the generation of vibration, and then the elastic buffer layer is used to absorb and buffer the generated vibration;

[0004] However, the motor in the above-mentioned centrifugal fan noise reduction structure is still rigidly connected to the base on which the fan casing is installed through a connecting structure. This causes the vibration generated during the operation of the motor to be easily transmitted from the connecting structure to the base. The vibration generated by the operation of the motor is also one of the noise sources of the centrifugal fan. This will cause the noise reduction box for reducing the noise of the motor to be unable to achieve a good noise reduction effect on the motor. Utility Model Content

[0005] The utility model aims to provide a noise reduction structure for a centrifugal fan to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the utility model provides the following technical solution: a centrifugal fan noise reduction structure, comprising a base, a fan is fixedly installed on the top of the base, a motor is arranged on the right outer wall of the fan, a mounting frame is fixedly installed on the bottom of the motor, the bottom end of the mounting frame is fixedly connected to the top of the base, and a noise reduction mechanism is fixedly installed on the outer wall of the base;

[0007] The noise reduction mechanism includes a soundproof shell, a silencer pipe 1, a silencer pipe 2, and a shock-absorbing structure. The soundproof shell is fixedly installed on the top of the base, and the soundproof shell covers the fan and the motor. The shock-absorbing structure is fixedly installed on the bottom of the base, and a mounting plate is fixedly installed on the bottom of the shock-absorbing structure. The bottom end of the silencer pipe 1 is connected to the air outlet of the fan, and the top end of the silencer pipe 1 extends out of the soundproof shell, the right end of the silencer pipe 2 is connected to the air inlet of the fan, and the left end of the silencer pipe 2 extends out of the soundproof shell.

[0008] Furthermore, a ventilation pipe is connected to the right inner wall of the soundproof shell, and the left end of the ventilation pipe faces the motor. A heat dissipation port is opened on the top of the soundproof shell, and the heat dissipation port is located directly above the motor.

[0009] Furthermore, a sound-absorbing baffle is fixedly installed on the inner wall of the fan, and five sound-absorbing baffles are provided and are respectively located on five inner walls of the soundproof shell.

[0010] Furthermore, the shock-absorbing structure includes a fixed cylinder, the bottom end of the fixed cylinder is fixedly connected to the top of the mounting plate, a sliding rod is slidably provided on the inner wall of the fixed cylinder, a connecting plate is fixedly installed on the top of the sliding rod, the top of the connecting plate is fixedly connected to the bottom of the base, a supporting spring is fixedly installed on the bottom of the sliding rod, the bottom end of the supporting spring is fixedly connected to the bottom inner wall of the fixed cylinder, a damper is fixedly installed on the bottom of the sliding rod, and the bottom end of the damper is fixedly connected to the bottom inner wall of the fixed cylinder.

[0011] Furthermore, an air intake fan is fixedly installed on the inner wall of the ventilation duct, and a silencer pipe three is fixedly installed on the inner wall of the heat dissipation port.

[0012] Furthermore, four shock absorbing structures are provided and are respectively located at the four corners of the bottom of the base, and a through hole is opened on the top of the mounting plate.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The fan and motor are covered by a soundproof shell to reduce the degree of noise generated during the operation of the fan and motor. A shock-absorbing structure is set at the bottom of the base to reduce the vibration generated during the operation of the fan and motor, thereby reducing the generation of noise. At the same time, a silencer pipe 2 is set at the air inlet of the fan, and a silencer pipe 1 is set at the air outlet of the fan to reduce the airflow noise generated by the fan, thereby achieving noise reduction in multiple directions of the fan and motor;

[0015] 2. Ventilation ducts and heat dissipation ports are set up so that the heat generated by the motor can heat the air near the motor. The heated air rises and enters the outside through the heat dissipation ports. The outside air at normal temperature enters the soundproof casing through the ventilation duct, and then comes into contact with the motor to cool it down, preventing the motor from being unable to work due to excessive temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 It is a structural schematic diagram of a front cross-sectional view of the sound insulation housing of the utility model;

[0018] Figure 3This is a structural schematic diagram of the bottom view of the sound insulation housing of the utility model;

[0019] Figure 4 It is a structural schematic diagram of a front sectional view of the shock absorbing structure of the utility model.

[0020] In the figure: 1. fan; 2. motor; 3. base; 4. mounting frame; 5. noise reduction mechanism; 501. sound insulation shell; 502. silencer pipe 1; 503. silencer pipe 2; 504. shock absorption structure; 505. mounting plate; 6. ventilation pipe; 7. silencer pipe 3; 8. air intake fan; 9. heat dissipation port; 10. sound absorbing partition; 5041. fixing tube; 5042. support spring; 5043. damper; 5044. sliding rod; 5045. connecting plate. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] See also Figure 1-Figure 4 The utility model provides a technical solution: a centrifugal fan noise reduction structure, including a base 3, a fan 1 is fixedly installed on the top of the base 3, a motor 2 is arranged on the right outer wall of the fan 1, a mounting frame 4 is fixedly installed on the bottom of the motor 2, the bottom end of the mounting frame 4 is fixedly connected to the top of the base 3, and a noise reduction mechanism 5 is fixedly installed on the outer wall of the base 3;

[0023] The noise reduction mechanism 5 includes a soundproof shell 501, a silencer pipe 1 502, a silencer pipe 2 503, and a shock-absorbing structure 504. The soundproof shell 501 is fixedly installed on the top of the base 3, and the soundproof shell 501 covers the fan 1 and the motor 2. The shock-absorbing structure 504 is fixedly installed on the bottom of the base 3. A mounting plate 505 is fixedly installed on the bottom of the shock-absorbing structure 504. The bottom end of the silencer pipe 1 502 is connected to the air outlet of the fan 1, and the top end of the silencer pipe 1 502 extends outside the soundproof shell 501. The right end of the silencer pipe 2 503 is connected to the air inlet of the fan 1, and the left end of the silencer pipe 2 503 extends outside the soundproof shell 501. The shell 501 covers the fan 1 and the motor 2 to reduce the degree of outward emission of noise generated during the operation of the fan 1 and the motor 2. A shock-absorbing structure 504 is arranged at the bottom of the base 3 to reduce the vibration generated during the operation of the fan 1 and the motor 2, thereby reducing the generation of noise. At the same time, a silencer pipe 503 is arranged at the air inlet of the fan 1, and a silencer pipe 502 is arranged at the air outlet of the fan 1 to reduce the airflow noise generated by the operation of the fan 1, thereby achieving noise reduction in multiple directions of the fan 1 and the motor 2. A sound-absorbing baffle 10 is fixedly installed on the inner wall of the fan 1. The sound-absorbing baffle 10 is arranged in five pieces and is respectively located at the five ends of the soundproof shell 501. On the inner wall, the noise generated is absorbed under the premise of sound insulation. There are four shock-absorbing structures 504, which are respectively located at the four corners of the bottom of the base 3, so that the shock-absorbing structure 504 supports the base 3 more stably. A through hole is opened on the top of the mounting plate 505 for installing the mounting plate 505 in the working position, and then the overall equipment is installed. The shock-absorbing structure 504 includes a fixed cylinder 5041, the bottom end of the fixed cylinder 5041 is fixedly connected to the top of the mounting plate 505, the inner wall of the fixed cylinder 5041 is slidably provided with a sliding rod 5044, and the top of the sliding rod 5044 is fixedly installed with a connecting plate 5045, and the connecting plate 504 The top of the sliding rod 5044 is fixedly connected to the bottom of the base 3, a support spring 5042 is fixedly installed at the bottom of the sliding rod 5044, and the bottom end of the support spring 5042 is fixedly connected to the bottom inner wall of the fixed cylinder 5041. A damper 5043 is fixedly installed at the bottom of the sliding rod 5044, and the bottom end of the damper 5043 is fixedly connected to the bottom inner wall of the fixed cylinder 5041. The support spring 5042 is provided to support the sliding rod 5044, and then to support the connecting plate 5045, so that the shock absorbing structure 504 can support the base 3, and the support spring 5042 is provided to damp the vibration transmitted to the shock absorbing structure 504;

[0024] The right inner wall of the soundproof shell 501 is connected to a ventilation duct 6, and the left end of the ventilation duct 6 faces the motor 2. A heat dissipation port 9 is provided on the top of the soundproof shell 501, and the heat dissipation port 9 is located directly above the motor 2. The ventilation duct 6 and the heat dissipation port 9 are arranged so that the heat generated by the operation of the motor 2 heats the air near the motor 2, and the heated air rises and enters the outside through the heat dissipation port 9. The normal temperature air of the outside enters the soundproof shell 501 through the ventilation duct 6, and then contacts the motor 2 to cool the motor 2, so as to prevent the motor 2 from being unable to work due to excessive temperature. An air intake fan 8 is fixedly installed on the inner wall of the ventilation duct 6. When the temperature is too high in summer, the air intake fan 8 can be used to accelerate the flow of air to cool the motor 2. A silencer pipe 7 is fixedly installed on the inner wall of the heat dissipation port 9 to reduce the noise of the air flowing out of the heat dissipation port 9.

[0025] Working principle: When in use, the vibration generated by the fan 1 and the motor 2 is transmitted to the base 3, and then transmitted from the base 3 to the shock-absorbing structure 504, and is damped by the shock-absorbing structure 504 to reduce the noise caused by the vibration generated by the fan 1 and the motor 2. The airflow noise generated by the fan 1 is reduced by the soundproof shell 501, the silencer pipe 1 502, and the silencer pipe 2 503. The airflow noise generated by the motor 2 is reduced by the soundproof shell 501.

[0026] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

Claims

1. A centrifugal fan noise reduction structure, comprising a base (3), characterized in that: A fan (1) is fixedly mounted on the top of the base (3); a motor (2) is arranged on the right outer wall of the fan (1); a mounting frame (4) is fixedly mounted on the bottom of the motor (2); the bottom end of the mounting frame (4) is fixedly connected to the top of the base (3); and a noise reduction mechanism (5) is fixedly mounted on the outer wall of the base (3); The noise reduction mechanism (5) comprises a soundproof shell (501), a first soundproof pipe (502), a second soundproof pipe (503), and a shock absorbing structure (504); the soundproof shell (501) is fixedly mounted on the top of the base (3); the soundproof shell (501) covers the fan (1) and the motor (2); the shock absorbing structure (504) is fixedly mounted on the bottom of the base (3); a mounting plate (505) is fixedly mounted on the bottom of the shock absorbing structure (504); the bottom end of the first soundproof pipe (502) is connected to the air outlet of the fan (1); the top end of the first soundproof pipe (502) extends out of the soundproof shell (501); the right end of the second soundproof pipe (503) is connected to the air inlet of the fan (1); and the left end of the second soundproof pipe (503) extends out of the soundproof shell (501).

2. A centrifugal fan noise reduction structure according to claim 1, characterized in that: A ventilation pipe (6) is provided on the right inner wall of the soundproof housing (501), and the left end of the ventilation pipe (6) faces the motor (2). A heat dissipation port (9) is provided on the top of the soundproof housing (501), and the heat dissipation port (9) is located directly above the motor (2).

3. The centrifugal fan noise reduction structure according to claim 1, characterized in that: A sound-absorbing baffle (10) is fixedly mounted on the inner wall of the fan (1), and five sound-absorbing baffles (10) are provided and are respectively located on the five inner walls of the sound-insulating outer shell (501).

4. The centrifugal fan noise reduction structure according to claim 1, characterized in that: The shock absorbing structure (504) comprises a fixed cylinder (5041), the bottom end of which is fixedly connected to the top of the mounting plate (505), a sliding rod (5044) is slidably arranged on the inner wall of the fixed cylinder (5041), a connecting plate (5045) is fixedly installed on the top of the sliding rod (5044), the top of the connecting plate (5045) is fixedly connected to the bottom of the base (3), a supporting spring (5042) is fixedly installed on the bottom of the sliding rod (5044), the bottom end of the supporting spring (5042) is fixedly connected to the bottom inner wall of the fixed cylinder (5041), a damper (5043) is fixedly installed on the bottom of the sliding rod (5044), and the bottom end of the damper (5043) is fixedly connected to the bottom inner wall of the fixed cylinder (5041).

5. The centrifugal fan noise reduction structure according to claim 2, characterized in that: An air intake fan (8) is fixedly mounted on the inner wall of the ventilation pipe (6), and a silencer pipe (7) is fixedly mounted on the inner wall of the heat dissipation port (9).

6. The centrifugal fan noise reduction structure according to claim 1, characterized in that: Four shock absorbing structures (504) are provided and are respectively located at the four corners of the bottom of the base (3), and a through hole is provided at the top of the mounting plate (505).

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