A low-noise centrifugal fan

Abstract

The application relates to the technical field of centrifugal fans, and discloses a low-noise centrifugal fan which comprises a fresh air volute one and a fresh air volute two, the inner wall of the fresh air volute one is clamped with the outer surface of the fresh air volute two, the outer surface of the fresh air volute two is fixedly installed with a sponge one, the bottom surface of the fresh air volute one is fixedly installed with a volute cover one, the bottom surface of the volute cover one is fixedly installed with a volute cover two, and the upper portion of the volute cover two is provided with a sponge two, a sponge three and a sponge four. The low-noise centrifugal fan is connected with the corresponding fresh air volute one, volute cover one and fresh air valve through the sponges one, sponges two, sponges three, sponges four and a sponge five, heat insulation and sound insulation effects are realized through the sponges, the rubber pads one, rubber pads two and rubber pads three can reduce vibration and noise, the centrifugal fan is further reduced in noise, and the noise of the centrifugal fan during work can be effectively reduced.

Description

Technical Field

[0001] This application relates to the field of centrifugal fan technology, specifically a low-noise centrifugal fan. Background Technology

[0002] Currently, centrifugal fans used in fresh air systems convert mechanical energy into the kinetic and pressure energy of gas through a high-speed rotating impeller. They consist of an impeller, volute, inlet and outlet, motor, bearings, and support. During operation, gas enters the impeller center axially from the fan. The impeller blades drive the gas to rotate at high speed. Under the action of centrifugal force, the gas is thrown towards the outer edge of the impeller, and its kinetic energy and pressure increase significantly. The high-speed gas enters the volute-shaped channel, where its speed decreases, and its kinetic energy is further converted into static pressure energy. The high-pressure gas is discharged through the outlet, completing the conveying or pressurization process.

[0003] However, the internal air duct of the centrifugal fan in the existing fresh air system is prone to noise increase due to the small turning radius inside the volute. At the same time, when the gas enters the volute from the high-speed impeller, the airflow impacts the duct wall due to inertia at the sharp bend, generating eddies and secondary flows. Utility Model Content

[0004] To address the shortcomings of existing technologies, this application provides a low-noise centrifugal fan that has the advantages of achieving heat and sound insulation through sponge, thus solving the problem of increased noise caused by the inertial impact of airflow on the duct wall during centrifugal fan operation.

[0005] To achieve the above objectives, this application provides the following technical solution: a low-noise centrifugal fan, comprising a fresh air volute 1 and a fresh air volute 2, wherein the inner wall of the fresh air volute 1 is snapped into the outer surface of the fresh air volute 2, a sponge 1 is fixedly installed on the outer surface of the fresh air volute 2, a volute cover 1 is fixedly installed on the bottom surface of the fresh air volute 1, a volute cover 2 is fixedly installed on the bottom surface of the volute cover 1, and a sponge 2, a sponge 3, and a sponge 4 are provided above the volute cover 2, the outer surfaces of the sponge 2, sponge 3, and sponge 4 are all fixedly installed on the opposite sides of the corresponding fresh air volute 1 and volute cover 1, a fresh air chamber shell is fixedly installed on the bottom surface of the volute cover 2, a fresh air valve is fixedly installed on the inner wall of the fresh air chamber shell, and a sponge 5 is fixedly installed on both the upper and lower surfaces of the fresh air valve.

[0006] To achieve heat insulation and sound insulation, the above scheme involves setting up two fresh air volutes, one and two, and connecting them. Sponge 1 is attached to the outer surface of fresh air volute 2, and sponges 2, 3, and 4 are connected to their corresponding fresh air volutes 1 and volute cover 1. A fresh air valve is installed on the inner wall of the fresh air chamber, and sponge 5 is installed on the upper and lower surfaces of the valve. The installation of sponge 5, along with sponges 1, 2, 3, 4, and 5, achieves heat insulation and sound insulation for the fresh air fan, preventing excessive noise during operation.

[0007] Furthermore, the inner wall of the fresh air volute is fixedly installed with fixing screws arranged at equal intervals, and a motor assembly is provided below the fresh air volute. The motor assembly is fixedly installed to the bottom surface of the fresh air volute by fixing screws.

[0008] With the above solution, fixing screw one is placed on the inner wall of fresh air volute one, and motor assembly is placed below fresh air volute one. Fixing screw one can connect motor assembly and fresh air volute one, thus realizing the installation of motor assembly.

[0009] Furthermore, the inner wall of the fresh air chamber shell is fixedly installed with two fixing screws arranged at equal intervals, and the outer surface of the two fixing screws is fixedly installed with the inner wall of the fresh air volute.

[0010] With the above solution, fixing screw two is set on the inner wall of the fresh air cavity shell, and fresh air volute one is connected to fixing screw two. Fixing screw two can connect fresh air cavity shell and fresh air volute one, so that fresh air volute one, volute cover one, volute cover two and fresh air cavity shell can be connected.

[0011] Furthermore, a stepper motor is provided on the outer surface of the fresh air cavity shell, and two fixing screws are fixedly installed on the inner wall of the stepper motor. The stepper motor is fixedly installed to the outer surface of the fresh air cavity shell by the two fixing screws.

[0012] The above method involves installing a stepper motor on the outer surface of the fresh air chamber shell and connecting it to two fixing screws. These fixing screws allow the stepper motor to be securely fixed to the outer surface of the fresh air chamber shell, thus achieving the installation of the stepper motor.

[0013] Furthermore, a second rubber pad is fixedly installed on the outer surface of the first fresh air volute, and a third rubber pad is fixedly installed on the outer surface of the first fresh air volute.

[0014] The above method involves installing rubber pad two on the outer surface of fresh air volute one and rubber pad three on the outer surface of fresh air volute one, thus achieving the installation of rubber pad two and rubber pad three.

[0015] Furthermore, a rubber pad is fixedly installed on the outer surface of the volute cover 2, and the rubber pads 1, 2 and 3 are all made of silicone rubber.

[0016] The above solution involves installing rubber pad 1 on the outer surface of the volute cover 2. All three rubber pads (1, 2, and 3) are made of silicone rubber. These three rubber pads can reduce vibration and noise, thus achieving a noise reduction effect.

[0017] Furthermore, a room temperature sensor wire is provided on the outer surface of the stepper motor, a low-voltage connection wire group is provided on the outer surface of the stepper motor, and the outer surface of the room temperature sensor wire is wrapped with equidistantly arranged velvet cloth.

[0018] The above method involves installing the room temperature sensor wire on the outer surface of the stepper motor, connecting the low-voltage connection wire group to the stepper motor, and wrapping the surface of the room temperature sensor wire with a velvet cloth to achieve the installation of the velvet cloth.

[0019] Furthermore, the inner wall of each of the velour fabrics is mounted to the outer surface of the corresponding low-voltage connection wire group and motor assembly wire harness, and a nameplate is fixedly mounted on the upper surface of the second fresh air volute.

[0020] The above method connects the velvet cloth to the corresponding low-voltage connection wire group and motor assembly wire harness, which can wrap and connect the room temperature sensor wire, low-voltage connection wire group and motor assembly wire harness. The nameplate is installed on the upper surface of the fresh air volute, which allows the operator to know the parameters and other information of the fresh air fan.

[0021] Compared with the prior art, the technical solution of this application has the following beneficial effects: This low-noise centrifugal fan, by incorporating components such as sponge one, sponge two, sponge three, and sponge four, connects these components to the corresponding fresh air volute one, volute cover one, and fresh air valve. The sponges achieve heat insulation and sound insulation, while the rubber pads one, two, and three provide vibration damping and noise reduction, further reducing the noise of the centrifugal fan and effectively minimizing its operating noise. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the entire application; Figure 2 This is a structural diagram of the fresh air valve in this application; Figure 3 This is a structural diagram of the room temperature sensor of this application; Figure 4 This is a vertical assembly structure diagram of this application; Figure 5This is a structural diagram of the sponge in this application; Figure 6 This is a structural diagram of the fleece fabric used in this application.

[0023] In the picture: 1. Fresh air volute housing one; 2. Fresh air volute housing two; 3. Volute housing cover one; 4. Volute housing cover two; 5. Fresh air cavity shell; 6. Fresh air valve; 7. Motor assembly; 8. Fixing screw one; 9. Fixing screw three; 10. Fixing screw two; 11. Stepper motor; 12. Sponge five; 13. Sponge one; 14. Sponge two; 15. Sponge three; 16. Sponge four; 17. Rubber pad one; 18. Rubber pad two; 19. Rubber pad three; 20. Room temperature sensor cable; 21. Low voltage connection cable assembly; 22. Flannel cloth; 23. Nameplate. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] Please see Figure 1 , Figure 4 and Figure 5 This embodiment of a low-noise centrifugal fan includes a fresh air volute 1 and a fresh air volute 2. The inner wall of the fresh air volute 1 is snapped onto the outer surface of the fresh air volute 2. A sponge 13 is fixedly installed on the outer surface of the fresh air volute 2. A volute cover 3 is fixedly installed on the bottom surface of the fresh air volute 1. A volute cover 4 is fixedly installed on the bottom surface of the volute cover 3. A sponge 2 14, a sponge 3 15, and a sponge 4 16 are provided above the volute cover 4. The outer surfaces of the sponges 2 14, 3 15, and 4 16 are all fixedly installed on the sides of the corresponding fresh air volute 1 and volute cover 3 that are far away from each other. A fresh air chamber shell 5 is fixedly installed on the bottom surface of the volute cover 4. A fresh air valve 6 is fixedly installed on the inner wall of the fresh air chamber shell 5. A sponge 5 12 is fixedly installed on both the upper and lower surfaces of the fresh air valve 6.

[0026] Please see Figure 4The inner wall of the fresh air volute 1 is fixedly equipped with equally spaced fixing screws 8. A motor assembly 7 is located below the fresh air volute 1. The motor assembly 7 is fixedly installed to the bottom surface of the fresh air volute 1 via the fixing screws 8. The fixing screws 8 are positioned on the inner wall of the fresh air volute 1, and the motor assembly 7 is positioned below the fresh air volute 1. The fixing screws 8 connect the motor assembly 7 and the fresh air volute 1, thus enabling the installation of the motor assembly 7. The motor assembly 7 includes a rotor magnetic ring and a stator. The rotor magnetic ring is fixedly connected in a ring shape to the inner wall of one side of the impeller, while the stator is movably connected to the inner wall of the rotor magnetic ring via a magnetic levitation air gap connection, with the air gap between the two being 0.2-2mm. In this embodiment, the internal iron core of the stator can be selected as a twelve-slot ten-pole or twelve-slot fourteen-pole structure.

[0027] Please see Figure 2 and Figure 4 The inner wall of the fresh air chamber shell 5 is fixedly installed with equally spaced fixing screws 10. The outer surface of the fixing screws 10 is fixedly installed with the inner wall of the fresh air volute 1. The fixing screws 10 are set on the inner wall of the fresh air chamber shell 5, and the fresh air volute 1 is connected to the fixing screws 10. The fixing screws 10 can connect the fresh air chamber shell 5 and the fresh air volute 1, so that the fresh air volute 1, the volute cover 3, the volute cover 4 and the fresh air chamber shell 5 can be connected.

[0028] Please see Figure 4 A stepper motor 11 is provided on the outer surface of the fresh air cavity shell 5. Two fixing screws 9 are fixedly installed on the inner wall of the stepper motor 11. The stepper motor 11 is fixedly installed to the outer surface of the fresh air cavity shell 5 by the two fixing screws 9. The stepper motor 11 is installed on the outer surface of the fresh air cavity shell 5 and connected to the stepper motor 11 by the two fixing screws 9. The fixing screws 9 can be used to fix the stepper motor 11 to the outer surface of the fresh air cavity shell 5, thus realizing the installation of the stepper motor 11.

[0029] Please see Figure 3 and Figure 4 A rubber pad 2 18 is fixedly installed on the outer surface of the fresh air volute 1, and a rubber pad 3 19 is fixedly installed on the outer surface of the fresh air volute 1. The rubber pad 2 18 and the rubber pad 3 19 are installed on the outer surface of the fresh air volute 1, thus realizing the installation of the rubber pad 2 18 and the rubber pad 3 19.

[0030] Please see Figure 3 and Figure 4Rubber pad 17 is fixedly installed on the outer surface of the volute cover 2 4. Rubber pad 17, rubber pad 2 18 and rubber pad 3 19 are all made of silicone rubber. Rubber pad 17 is installed on the outer surface of the volute cover 2 4. Rubber pad 17, rubber pad 2 18 and rubber pad 3 19 are all made of silicone rubber. The rubber pad 17, rubber pad 2 18 and rubber pad 3 19 can achieve shock absorption and noise reduction, thus achieving the effect of noise reduction.

[0031] Please see Figure 3 and Figure 6 A room temperature sensor wire 20 is provided on the outer surface of the stepper motor 11, and a low-voltage connection wire group 21 is provided on the outer surface of the stepper motor 11. The outer surface of the room temperature sensor wire 20 is wrapped with equidistantly arranged velvet cloth 22. The room temperature sensor wire 20 is installed on the outer surface of the stepper motor 11, and the low-voltage connection wire group 21 is connected to the stepper motor 11. The velvet cloth 22 is wrapped around the surface of the room temperature sensor wire 20 to realize the installation of the velvet cloth 22.

[0032] Please see Figure 3 and Figure 6 Each velvet cloth 22 has its inner wall installed on the outer surface of the corresponding low-voltage connection wire group 21 and motor assembly 7 wire harness. A nameplate 23 is fixedly installed on the upper surface of the fresh air volute 2. The velvet cloth 22 is connected to the corresponding low-voltage connection wire group 21 and motor assembly 7 wire harness, which can wrap and connect the room temperature sensor wire 20, the low-voltage connection wire group 21 and the motor assembly 7 wire harness. The nameplate 23 is installed on the upper surface of the fresh air volute 2, which makes it easy for operators to know the parameters and other information of the fresh air fan.

[0033] This embodiment of a low-noise centrifugal fan utilizes components such as sponge 13, sponge 24, sponge 35, and sponge 46. These components are connected to the corresponding fresh air volute 1, volute cover 3, and fresh air valve 6. The sponges provide heat insulation and sound insulation, while the rubber pads 17, 18, and 19 reduce vibration and noise, further minimizing the noise of the centrifugal fan during operation.

[0034] It should be noted that the wiring harness of motor assembly 7 includes UL1430, 22AWG, VW-1, 105°C (red, black, yellow, blue), sponge 5 12 is made of PU material, while sponge 1 13, sponge 2 14, sponge 3 15 and sponge 4 16 are made of PU+PE material.

[0035] The working principle of the above embodiments is as follows: By attaching sponges 13, 14, 15, and 16 to the corresponding fresh air volute 1 and volute cover 3, and attaching sponge 5 to the fresh air valve 6, heat insulation and sound insulation effects can be achieved through sponges 13, 14, 15, and 16. By connecting rubber pads 17, 18, and 19 to the outer surfaces of the corresponding volute cover 4 and fresh air volute 1, vibration damping and noise reduction effects can be achieved, further reducing the noise of the centrifugal fan and effectively reducing the noise during the operation of the centrifugal fan.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0037] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-noise centrifugal fan, comprising a first fresh air volute (1) and a second fresh air volute (2), characterized in that: The inner wall of the first fresh air volute (1) is snapped onto the outer surface of the second fresh air volute (2). A sponge (13) is fixedly installed on the outer surface of the second fresh air volute (2). A volute cover (3) is fixedly installed on the bottom surface of the first fresh air volute (1). A volute cover (4) is fixedly installed on the bottom surface of the first volute cover (3). A sponge (14), a sponge (15), and a sponge (16) are provided above the second volute cover (4). The outer surfaces of the sponges (14), (15), and (16) are fixedly installed on the side of the corresponding first fresh air volute (1) and the first volute cover (3) that is far away from each other. A fresh air chamber shell (5) is fixedly installed on the bottom surface of the second volute cover (4). A fresh air valve (6) is fixedly installed on the inner wall of the fresh air chamber shell (5). A sponge (12) is fixedly installed on the upper and lower surfaces of the fresh air valve (6).

2. The low-noise centrifugal fan according to claim 1, characterized in that: The inner wall of the fresh air volute (1) is fixedly installed with fixing screws (8) arranged at equal intervals. The bottom of the fresh air volute (1) is provided with a motor assembly (7). The motor assembly (7) is fixedly installed to the bottom surface of the fresh air volute (1) by fixing screws (8).

3. A low-noise centrifugal fan according to claim 1, characterized in that: The inner wall of the fresh air chamber shell (5) is fixedly installed with two fixing screws (10) arranged at equal intervals, and the outer surface of the two fixing screws (10) is fixedly installed with the inner wall of the fresh air volute shell (1).

4. A low-noise centrifugal fan according to claim 1, characterized in that: A stepper motor (11) is provided on the outer surface of the fresh air chamber shell (5). Two fixing screws (9) are fixedly installed on the inner wall of the stepper motor (11). The stepper motor (11) is fixedly installed on the outer surface of the fresh air chamber shell (5) by the two fixing screws (9).

5. A low-noise centrifugal fan according to claim 1, characterized in that: Rubber pad 2 (18) is fixedly installed on the outer surface of the fresh air volute 1 (1), and rubber pad 3 (19) is fixedly installed on the outer surface of the fresh air volute 1 (1).

6. A low-noise centrifugal fan according to claim 5, characterized in that: Rubber pad one (17) is fixedly installed on the outer surface of the volute cover two (4). The rubber pad one (17), rubber pad two (18) and rubber pad three (19) are all made of silicone rubber.

7. A low-noise centrifugal fan according to claim 4, characterized in that: The outer surface of the stepper motor (11) is provided with a room temperature sensor line (20), the outer surface of the stepper motor (11) is provided with a low-voltage connection line group (21), and the outer surface of the room temperature sensor line (20) is wrapped with equidistantly arranged velvet cloth (22).

8. A low-noise centrifugal fan according to claim 7, characterized in that: The inner wall of each of the velvet (22) is mounted to the outer surface of the corresponding low-voltage connection wire group (21) and motor assembly (7) wire harness, and a nameplate (23) is fixedly mounted on the upper surface of the fresh air volute (2).

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