A blast volute noise reduction structure

Abstract

The application discloses a blast worm shell noise reduction structure. It includes a blower assembly, the blower assembly includes a blower worm shell base, a blower worm shell cover plate, a blower motor and a speed regulation module, the blower motor and the speed regulation module are installed on the blower worm shell base and are sealed through the blower worm shell cover plate; the speed regulation module is arranged at a corner side of the blower worm shell base close to a blower impeller, a cooling channel notch is formed at the other corner side of the blower worm shell base, the cooling channel notch is communicated with an independent closed sound absorbing cavity, an air inlet channel perforated plate is arranged in the sound absorbing cavity, the air inlet channel perforated plate is an integrated structure formed by connecting an air inlet channel and a perforated plate, and sound absorbing felt is attached to the top of the perforated plate. The application weakens the noise influence caused by the cooling channel notch by improving the cooling channel structure of the blower worm shell and designing the sound absorbing cavity.

Description

Technical Field

[0001] This invention belongs to the field of vehicle air conditioning technology, specifically relating to a noise reduction structure for a blower volute. Background Technology

[0002] With the increasing popularity of automobiles, drivers and passengers have higher and higher requirements for in-vehicle comfort. Car air conditioning has become a standard feature of the entire vehicle. The noise problem caused by the air conditioning has become an important indicator of the overall comfort experience. Low noise and high air volume are the mainstream directions of car air conditioning design.

[0003] Without sacrificing airflow, current automotive air conditioning noise reduction methods mainly involve adding sound insulation cotton around the air conditioner unit, which increases costs. Few air conditioners address noise reduction from within. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the aforementioned background technology and provide a blower volute noise reduction structure.

[0005] The technical solution adopted in this invention is: a blower volute noise reduction structure, including a blower assembly, the blower assembly including a blower volute base, a blower volute cover plate, a blower motor and a speed control module, the blower motor and the speed control module are installed on the blower volute base and sealed by the blower volute cover plate; the blower motor is provided with a blower impeller, the speed control module is arranged on one side of the corner of the blower volute base near the blower impeller, a cooling channel notch is opened on the other side of the corner of the blower volute base, the cooling channel notch connects to an independent and closed silencing cavity, the space above the blower motor is connected to one end of the blower cooling channel located outside the blower assembly, and the other end of the blower cooling channel is connected to the top of the silencing cavity;

[0006] The silencing cavity is equipped with a perforated plate for the air intake channel. The perforated plate for the air intake channel is an integral structure formed by connecting the air intake channel and the perforated plate. The cooling channel notch is connected to the air intake channel. Sound-absorbing felt is attached to the top of the perforated plate.

[0007] The perforated plate of the air intake channel and the blower volute base surround each other to form a flow air cavity;

[0008] The static airflow cavity formed by the sound-absorbing felt and the blower volute cover plate is a cavity.

[0009] The airflow cavity and the cavity together form a sound-absorbing cavity.

[0010] A cooling port for the bottom plate of the blower volute is provided above the silencing cavity. A blower cooling channel port is provided at one end of the blower cooling channel that connects to the silencing cavity. The blower cooling channel port is connected to the cooling port of the bottom plate of the blower volute.

[0011] The air intake channel has small and large air intake holes arranged alternately on the air intake surface.

[0012] The perforated plate is provided with equidistant circular holes.

[0013] The air intake channel is vertically connected to the perforated plate.

[0014] The perforated plate of the air intake channel and the sound-absorbing felt attached thereon separate the airflow cavity from the cavity.

[0015] The air intake channel of this invention is located at the corner of the volute, where the airflow is relatively fast, which is beneficial for the cooling air intake of the blower motor. The air intake cross-section uses a staggered arrangement of large and small holes to buffer the airflow pressure drop at the inlet (existing technology sets a gap here to allow the rapid airflow to enter the silencing and then enter the motor cooling port, but the airflow pressure drop caused by the gap design of the existing technology increases the noise). The silencing cavity of this invention is a cavity formed by six sides, one side is the air intake channel surface, one side is the air outlet channel surface, and the other four sides are surrounded by the blower volute shell. Inside, a perforated air intake channel plate and a sound-absorbing felt are placed horizontally in the middle, with the sound-absorbing felt tightly attached to the perforated air intake channel plate. The one-piece structure of the perforated air intake channel plate facilitates the support of the perforated plate. The perforated plate of the intake channel and the sound-absorbing felt divide the silencing chamber into two cavities. The static airflow cavity formed by the sound-absorbing felt and the blower volute cover plate is an empty cavity, while the flowing airflow cavity formed by the perforated plate of the intake channel and the blower volute base is a flowing airflow cavity. The rapid airflow at the corner of the volute passes through the holes of various sizes in the intake channel, which cools the motor on one hand and generates sound waves in the cavity on the other. These sound waves act on the sound-absorbing felt on the back of the perforated plate of the intake channel, causing the sound-absorbing felt to vibrate. The sound-absorbing felt and the cavity behind it can absorb the sound waves and reduce the noise impact caused by the gap in the cooling channel.

[0016] This invention aims to reduce the noise impact caused by gaps in the cooling channel by improving the structure of the cooling channel of the blower volute and designing a sound-absorbing cavity, while ensuring the necessary cooling effect of the blower motor.

[0017] This invention does not change the external boundary conditions or add extra sound-absorbing cotton; it only optimizes the internal structure of the blower volute cooling channel to improve air conditioning noise. Attached Figure Description

[0018] Figure 1 A schematic diagram of the blower assembly with the blower volute cover removed;

[0019] Figure 2 for Figure 1 A schematic diagram of the blower assembly without the sound-absorbing felt;

[0020] Figure 3 This is a schematic diagram of the integrated structure of the multi-hole plate for the air intake channel;

[0021] Figure 4 A schematic diagram of the blower assembly structure and its position in the air conditioner;

[0022] Figure 5 for Figure 2 A schematic diagram of the blower assembly without the perforated plate of the air intake passage;

[0023] Figure 6 This is a schematic diagram of the blower assembly with the blower motor and blower volute base removed.

[0024] Figure 7 This is a schematic diagram of the airflow inside the blower assembly;

[0025] Figure 8 A schematic diagram comparing air conditioning noise test data after adding a perforated plate with an air intake channel and sound-absorbing felt inside the volute.

[0026] In the diagram: 10-Perforated plate for air intake channel; 11-Air intake channel; 12-Small hole for air intake surface; 13-Large hole for air intake surface; 14-Perforated plate; 15-Round hole; 20-Sound-absorbing felt; 100-Blower volute base; 101-Cooling channel notch; 105-Cooling port for blower volute bottom plate; 110-Blower volute cover plate; 120-Blower motor; 121-Blower impeller; 122-Blower cooling channel port; 123-Blower cooling channel; 130-Speed ​​control module; 200-Flowing airflow chamber; 300-Cavity; A-Silencing chamber. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but these descriptions do not constitute a limitation on the present invention.

[0028] Reference to the location and structure of the blower assembly in the air conditioner Figure 4 As shown, Figure 1 As shown in Figure 6, the present invention includes a blower assembly, which includes a blower volute base 100, a blower volute cover plate 110, a blower motor 120, and a speed control module 130. The blower motor 120 and the speed control module 130 are mounted on the blower volute base 100 and sealed by the blower volute cover plate 110. The blower motor 120 is provided with a blower impeller 121. The speed control module 130 is arranged on one side of the corner of the blower volute base 100 near the blower impeller 121. A cooling channel notch 101 is opened on the other side of the corner of the blower volute base 100. The cooling channel notch 101 is connected to an independently closed silencing cavity A. The space above the blower motor 120 is connected to one end of the blower cooling channel 123 located outside the blower assembly. The other end of the blower cooling channel 123 is connected to the top of the silencing cavity A.

[0029] according to Figure 7The internal fluid flow is shown. The flow velocity is fastest at the corner of the blower volute base 100, which is conducive to heat dissipation. Therefore, the silencing cavity A is arranged here. The silencing cavity A is equipped with an air intake channel perforated plate 10. The air intake channel perforated plate 10 is an integrated structure formed by connecting the air intake channel 11 and the perforated plate 14. The cooling channel notch 101 is connected to the air intake channel 11. Sound-absorbing felt 20 is attached to the top of the perforated plate 14.

[0030] The perforated plate 10 of the air intake channel and the blower volute base 100 surround each other to form a flow air cavity 200;

[0031] The static airflow cavity formed by the sound-absorbing felt 20 and the blower volute cover plate 110 is a cavity 300.

[0032] The airflow cavity 200 and the cavity 300 together constitute the silencing cavity A.

[0033] A blower volute bottom plate cooling port 105 is provided above the silencing cavity A. A blower cooling channel 122 is provided at one end of the blower cooling channel 123 that connects to the silencing cavity A. The blower cooling channel 122 is connected to the blower volute bottom plate cooling port 105.

[0034] The intake channel 11 has small intake holes 12 and large intake holes 13 arranged alternately on the intake surface.

[0035] The perforated plate 14 has equidistant circular holes 15 arranged on it.

[0036] The air intake channel 11 is vertically connected to the perforated plate 14.

[0037] The perforated plate 10 of the air intake channel and the sound-absorbing felt 20 attached thereon separate the airflow cavity 200 from the cavity 300.

[0038] Reference Figure 1 and Figure 6 As shown, the perforated plate 10 of the air intake channel and the blower volute base 100 form a flow air cavity 200. The blower motor 120 rotates, driving the blower impeller 121 to rotate. Part of the airflow generated by the rotation of the blower impeller 121 enters the flow air cavity 200 through the staggered small air intake holes 12 and large air intake holes 13 on the air intake channel 11. This part of the airflow enters the blower cooling channel 123 from the flow air cavity 200 through the blower cooling channel port 122, and finally enters the blower motor 120 to cool the blower motor 120. The static airflow cavity formed by the sound-absorbing felt 20 and the blower volute cover plate 110 is a cavity 300. The perforated plate 10 of the air intake channel and the sound-absorbing felt 20 attached thereto separate the airflow chamber 200 and the cavity 300. The sound waves generated by the airflow within the airflow chamber 200 can be absorbed and processed by the sound-absorbing felt 20 and the cavity 300 behind it, thereby alleviating the noise from the cooling channel notch 101. Figure 8The experimental comparison data shown demonstrates that the designed perforated intake plate 10 and sound-absorbing felt 20 can effectively reduce noise in the 500-1500Hz frequency range.

[0039] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A blast worm shell noise reduction structure, comprising a blower assembly, the blower assembly comprising a blower worm shell base (100), a blower worm shell cover plate (110), a blower motor (120) and a speed regulation module (130), the blower motor (120) and the speed regulation module (130) being installed on the blower worm shell base (100) and sealed by the blower worm shell cover plate (110); characterized in that: The air blower motor (120) is provided with an air blower impeller (121), the speed regulation module (130) is arranged at the corner of the air blower volute base (100) and close to the air blower impeller (121), the corner of the air blower volute base (100) is provided with a cooling channel notch (101), the cooling channel notch (101) is communicated with an independent closed sound attenuation cavity (A), the space above the air blower motor (120) is communicated with one end of the air blower cooling channel (123) located outside the air blower assembly, and the other end of the air blower cooling channel (123) is communicated with the upper part of the sound attenuation cavity (A). The sound attenuation cavity (A) is provided with an air inlet channel perforated plate (10), the air inlet channel perforated plate (10) is an integrated structure formed by connecting an air inlet channel (11) and a perforated plate (14), the cooling channel notch (101) is communicated with the air inlet channel (11), and the upper part of the perforated plate (14) is attached with sound-absorbing felt (20). The air inlet channel perforated plate (10) and the air blower volute base (100) surround to form a flowing air flow cavity (200). The sound-absorbing felt (20) and the air blower volute cover plate (110) surround to form a static air flow cavity, which is a cavity (300). The flowing air flow cavity (200) and the cavity (300) jointly form the sound attenuation cavity (A).

2. The blast-duct-casing noise reduction structure according to claim 1, characterized in that: The sound attenuation cavity (A) is provided with an air blower volute base cooling port (105) above, one end of the air blower cooling channel (123) communicated with the sound attenuation cavity (A) is provided with an air blower cooling channel port (122), and the air blower cooling channel port (122) is in butt joint with the air blower volute base cooling port (105).

3. The blast-duct-casing noise reduction structure of claim 1, wherein: The air inlet channel (11) is provided with air inlet face small holes (12) and air inlet face large holes (13) arranged alternately on the air inlet face.

4. The blast-duct-casing noise reduction structure of claim 1, wherein: The perforated plate (14) is provided with equidistant circular holes (15).

5. The blast-duct silencer structure according to claim 1, wherein: The air inlet channel (11) is vertically connected with the perforated plate (14).

6. The blast-duct-casing noise reduction structure of claim 1, wherein: The air inlet channel perforated plate (10) and the sound-absorbing felt (20) attached thereto separate the flowing air flow cavity (200) and the cavity (300).

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