Fan vibration and noise reduction device and method applied to outdoor cooling unit of air conditioner

Abstract

The invention discloses a fan vibration and noise reduction device and method applied to an outdoor cooling unit of an air conditioner, relates to the technical field of fan vibration and noise reduction, and aims to solve the problem of fan noise reduction in the outdoor cooling unit of the air conditioner. A sound absorption box, a resonant cavity, a sealing plate and a narrow neck jointly form a Helmholtz resonant cavity structure; in the rotating process of fan blades of the fan assembly, the inner machine frame is of an air guide ring structure, when the fan blades in the fan assembly rotate to generate vibration noise, the number of resonant cavity structures is determined according to the peak frequency of discrete noise to be absorbed, multiple resonant frequency peak values can be absorbed at the same time, and good broadband sound absorption performance is achieved; and on the basis of the arrangement of the Helmholtz resonant cavity structure, the stable shock absorption and noise reduction effects of the cooling unit of the outdoor unit of the air conditioner are jointly achieved through the mode of synchronously adding an acoustic liner structure and the mode of assisting same-frequency noise absorption with flexible noise elimination.

Description

TECHNICAL FIELD

[0001] The application relates to a fan vibration reduction and noise reduction device and method applied to an air conditioner outdoor cooling unit. BACKGROUND

[0002] With the popularization of air conditioners among household users, people's requirements for the noise level of air conditioners are increasing. Air conditioner noise not only affects indoor personnel, but also affects the surrounding environment, causing significant interference to life and work. Therefore, the noise size has become one of the key indicators for measuring the quality of air conditioner products.

[0003] The main noise source of an air conditioner outdoor unit is the compressor and the fan, including the compressor body noise, the fan system noise, the whole machine structure vibration noise (caused by the compressor or fan motor), and the gas dynamics noise or structure vibration noise caused by the flow of refrigerant in the pipe.

[0004] Currently, outdoor unit noise control mainly starts from the following aspects: compressor body noise control, fan aerodynamic and vibration noise control, noise control caused by flow in the heat exchange pipe, and whole machine structure vibration noise control.

[0005] And the Helmholtz resonator is a physical structure that uses the principle of acoustic resonance, which was proposed by German physicist Hermann von Helmholtz in the 19th century. The core principle is to connect a closed cavity through a narrow neck (or opening) and resonate at a specific frequency, thereby absorbing or amplifying sound waves. In the prior art, the fan uses traditional sound-absorbing materials (sponge) to absorb low-frequency noise, which can also achieve effective noise reduction. Therefore, combining the above-mentioned control of fan aerodynamic and vibration noise is the most economical and effective noise optimization method. Therefore, the present application proposes a solution: specifically, the fan body aerodynamic optimization (additional Helmholtz resonator structure) and sound insulation noise reduction are combined. SUMMARY

[0006] The purpose of the present application is to provide a fan vibration reduction and noise reduction device and method applied to an air conditioner outdoor cooling unit, which solves the problems in the background art.

[0007] The purpose of the present application can be achieved by the following technical solution: a fan vibration reduction and noise reduction device applied to an air conditioner outdoor cooling unit, comprising an indoor unit frame and an outdoor unit plate, a fan assembly is arranged in the middle of the indoor unit frame, and the outer ring side of the indoor unit frame is bent and covered with at least four resonant cavity structures towards the outside;

[0008] The resonant cavity structure comprises a sound absorption box connected with the indoor unit frame, an enclosing plate is attached to the outer side of the sound absorption box, and the inside of the sound absorption box is divided into at least six resonant cavities by a partition plate.

[0009] The inner machine frame is provided with a through hole in communication with the resonance cavity, and the sound absorption box is provided with a narrow neck opening corresponding to the through hole.

[0010] Further, the outer machine plate is sleeved on the outer side of the inner machine frame and has the same width, and the rear side of the outer machine plate is provided with a rack connected with the fan assembly.

[0011] Further, the outer side of the inner machine frame is provided with an open threaded hole and a butt joint groove, the inner ring side of the outer machine plate is provided with a contact block, the outer side of the contact block is provided with a matching plate matched with the butt joint groove, and the outer end of the matching plate is provided with a positioning screw rod engaged with the open threaded hole.

[0012] Further, the outer side of the inner machine frame is provided with an open threaded hole and a butt joint groove, the inner ring side of the outer machine plate is provided with a contact block, the outer side of the contact block is provided with a matching plate matched with the butt joint groove, and the outer end of the matching plate is provided with a positioning screw rod engaged with the open threaded hole.

[0013] Further, the length of each resonance cavity in the circumferential direction is different, and the setting positions of each through hole and narrow neck opening are all in the middle part of the resonance cavity.

[0014] Further, the through hole and the narrow neck opening are the same in shape, which are circular, square or any closed curve and combination thereof.

[0015] Further, the middle part of the outer end of the positioning screw rod is provided with a mounting hole, and the mounting hole is used for connecting the outer machine plate, the inner machine frame and the main body of the outdoor air conditioner.

[0016] The fan vibration reduction and noise reduction method applied to the outdoor cooling unit of an air conditioner includes the following steps:

[0017] a: The outer machine plate and the rack are sleeved on the outer side of the inner machine frame, and at the same time, the matching plate and the contact block are attached to the butt joint groove on the inner machine frame, and then the positioning screw rod is screwed through the open threaded hole until the matching plate is fixed, at this time, the mounting hole on the positioning screw rod is exposed, and the outer machine plate, the inner machine frame and the rack can be connected to the main body of the outdoor air conditioner through the bolt attached to the mounting hole, and the installation is completed.

[0018] b: When the fan assembly in the outdoor cooling unit of the air conditioner rotates, the matching plate and the contact block jointly form a sound insulation structure, which provides flexible connection and can also avoid the vibration and noise problem between the outer machine plate and the inner machine frame when the fan assembly rotates at high speed;

[0019] c1: When the fan assembly in the outdoor cooling unit of the air conditioner rotates, the inner machine frame is a "wind guiding ring structure", when the fan blade in the fan assembly rotates to produce vibration and noise, the air forms a "piston" movement through the narrow neck opening, and is significantly amplified at a certain frequency, so as to consume sound energy and realize sound absorption.

[0020] c2: when the fan assembly in the air conditioner outdoor unit cooling unit rotates, at least four resonance cavity structures are uniformly distributed on the outside of the indoor frame, and the arrangement of at least six resonance cavities in each resonance cavity structure can effectively perform vibration noise reduction of the circumferential "air guide ring" structure of the fan assembly. The vibration noise generated by the high-speed rotation of the fan assembly is eliminated by the resonance cavity, avoiding the harm caused by acoustic resonance in the air conditioner outdoor unit cooling unit.

[0021] The present application has the following advantages:

[0022] 1. For the noise reduction problem of the fan in the air conditioner outdoor unit cooling unit, the "Helmholtz resonance cavity structure" is composed of a sound absorption box, a resonance cavity, a sealing plate and a narrow neck. In the rotation process of the fan blade of the fan assembly, the indoor frame is a "air guide ring structure". When the fan blade in the fan assembly rotates and generates vibration noise, the resonance cavity structure is arranged in a non-equal division manner, which can match the sound wave frequency of the current vibration noise and complete the sound energy consumption to achieve sound absorption. The peak frequency of the discrete noise to be absorbed is determined. It can not only absorb multiple resonance frequency peaks at the same time, but also has good broadband sound absorption performance. It corresponds to the stationary part on the outer circumferential side of the fan assembly, and will not affect the normal rotation of the fan assembly, nor will it affect the structural strength and rotor dynamics characteristics of the air conditioner outdoor unit.

[0023] 2. On the basis of the arrangement of the "Helmholtz resonance cavity structure", the vibration and noise reduction device and the air conditioner outdoor unit cooling unit form an integrated structure by synchronously adding a sound lining structure, which provides flexible connection and avoids the vibration and noise problem between the outdoor plate and the indoor frame when the fan assembly rotates at high speed. With the aid of flexible noise reduction, the same frequency noise absorption and flexible noise reduction are used to achieve stable vibration and noise reduction effect of the air conditioner outdoor unit cooling unit. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0025] Fig. 1 It is a structural schematic diagram of the present application;

[0026] Fig. 2 It is a rear view structural schematic diagram of the present application;

[0027] Fig. 3 It is a split schematic diagram of the overall structure of the present application;

[0028] Fig. 4Split view of the resonant cavity structure of the present application;

[0029] Fig. 5 Internal view of the resonant cavity of the present application;

[0030] Fig. 6 Sectional view of part of the structure of the present application.

[0031] In the figure: 1, outer machine plate; 2, inner machine frame; 3, machine frame; 4, fan assembly; 5, positioning screw; 6, through hole; 7, open threaded hole; 8, butt joint groove; 9, outer mounting groove; 10, sealing plate; 11, bonding plate; 12, contact block; 13, sound absorption box; 14, partition; 15, narrow neck opening; 16, resonant cavity; 17, mounting hole. DETAILED DESCRIPTION

[0032] The technical solutions of the present application will be described clearly and completely below in conjunction with the embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] Embodiment one: for the noise reduction problem in the fan of the air conditioner outdoor cooling unit, the following technical solution is proposed:

[0034] Referring to Figs. 1-6 the figure, the fan vibration reduction and noise reduction device applied in the air conditioner outdoor cooling unit in the present embodiment includes an inner machine frame 2 and an outer machine plate 1. The middle part of the inner machine frame 2 is provided with a fan assembly 4. The outer ring side of the inner machine frame 2 is bent and angled towards the outside and is covered with at least four resonant cavity structures at intervals. The resonant cavity structure includes a sound absorption box 13 connected to the inner machine frame 2. The outer side of the sound absorption box 13 is fitted with a sealing plate 10. The inside of the sound absorption box 13 is divided into at least six resonant cavities 16 by a partition 14.

[0035] Specifically, the at least four resonant cavity structures are evenly distributed on the outer side of the inner machine frame 2. The setting of at least six resonant cavities 16 in each resonant cavity structure can effectively reduce the vibration noise of the circumferential "wind guiding ring" structure of the fan assembly 4. The vibration noise generated when the fan assembly 4 rotates at high speed is eliminated by the resonant cavities 16, avoiding the harm caused by acoustic resonance in the air conditioner outdoor cooling unit.

[0036] The inner machine frame 2 is provided with a through hole 6 connected to the resonant cavity 16. The sound absorption box 13 is provided with a narrow neck opening 15 corresponding to the through hole 6. The narrow neck opening 15 is matched with the sound wave frequency in the high-speed rotation process of the fan assembly 4. When air flows through the narrow neck opening 15, it forms a "piston" motion and is significantly amplified at a specific frequency, thereby consuming sound energy to achieve sound absorption.

[0037] The length of each resonant cavity 16 in the circumferential direction is different from each other, and the setting position of each through hole 6 and narrow neck 15 is the middle part of the resonant cavity 16. The purpose of the central setting of the through hole 6 and the narrow neck 15 on the resonant cavity is to more effectively complete the uniform distribution of sound waves, and finally realize the absorption of discrete noise, considering the divergence of the airflow after being conducted through the through hole 6 and the narrow neck 15.

[0038] The through hole 6 and the narrow neck 15 are the same shape, which is circular, square or any closed curve and combination thereof, and more preferably, a circular or rectangular cross-section opening is adopted. The communication of the through hole 6 and the narrow neck 15 with the same shape of the circular or rectangular cross-section opening is to provide the communication between the air duct and the resonant cavity, so as to guide the airflow and produce the same frequency absorption effect, and the synchronous change of the same shape of the through hole 6 and the narrow neck 15 can stably guide the airflow.

[0039] The basic principle of the present application is that the sound absorption box 13, the resonant cavity 16, the sealing plate 10 and the narrow neck 15 jointly constitute a "Helmholtz resonant cavity structure". In the rotating process of the fan assembly 4, the inner machine frame 2 is a "wind guide ring structure". When the fan assembly 4 rotates and generates vibration noise, the resonant cavity structure is arranged in a non-equal division manner, which can match the sound wave frequency of the current vibration noise and complete the sound energy consumption to realize sound absorption. The specific peak frequency of the discrete noise to be absorbed is determined. It can not only absorb multiple resonant frequency peaks at the same time, but also has good wideband sound absorption performance. It corresponds to the stationary part on the outer peripheral side of the fan assembly 4, and does not affect the normal rotation of the fan assembly 4, nor does it affect the structural strength and rotor dynamics characteristics of the air conditioner outdoor unit.

[0040] Embodiment two: the structure of embodiment one is optimized in this embodiment.

[0041] Referring to Figs. 1-3 The outer machine plate 1 is sleeved on the outer side of the inner machine frame 2 and has the same width. The rear side of the outer machine plate 1 is provided with a machine frame 3 connected with the fan assembly 4. The outer side of the inner machine frame 2 is provided with an open screw hole 7 and a butt joint groove 8. The inner ring side of the outer machine plate 1 is provided with a contact block 12. The outer side of the contact block 12 is provided with a matching plate 11 matched with the butt joint groove 8. The outer end of the matching plate 11 is provided with a positioning screw 5 engaged with the open screw hole 7.

[0042] The inner end of the positioning screw 5 is in abutment with the matching plate 11. The matching plate 11 and the contact block 12 are made of elastic sound absorption material and jointly constitute a sound insulation structure, which provides flexible connection and can also avoid the vibration noise problem between the outer machine plate 1 and the inner machine frame 2 when the fan assembly 4 rotates at high speed.

[0043] After the outer machine plate 1 and the machine frame 3 are sleeved outside the inner machine frame 2, the abutting plate 11 and the contact block 12 are fixed at the docking groove 8 on the inner machine frame 2, and the outer mounting groove 9 is formed between the adjacent two sound absorption boxes 13, and the open threaded hole 7 and the docking groove 8 are arranged at the middle portions of the two sides of the outer mounting groove 9.

[0044] The middle portion of the outer end of the positioning screw 5 is provided with a mounting hole 17, which is used for connecting the outer machine plate 1, the inner machine frame 2 and the main body of the air conditioner outdoor unit.

[0045] Specifically, when the vibration and noise reduction device is installed on the air conditioner outdoor unit, the outer machine plate 1 and the machine frame 3 are connected to the inner machine frame 2 for installation, specifically, the outer machine plate 1 and the machine frame 3 are sleeved outside the inner machine frame 2, and at the same time, the abutting plate 11 and the contact block 12 are attached to the docking groove 8 on the inner machine frame 2, and then the positioning screw 5 is screwed into the open threaded hole 7 until the abutting plate 11 is fixed, at this time, the mounting hole 17 on the positioning screw 5 is exposed, and the outer machine plate 1, the inner machine frame 2 and the machine frame 3 can be connected to the main body of the air conditioner outdoor unit through the bolt attached to the mounting hole 17, and the installation is completed.

[0046] Structural advantages: the installation method of the vibration and noise reduction device can add the vibration and noise reduction device to the original air conditioner outdoor cooling unit, so that the vibration and noise reduction device and the air conditioner outdoor cooling unit form an integrated structure, and at the same time, the sound insulation structure is added when the Helmholtz resonance cavity structure is added, so that the stable damping and noise reduction effect of the air conditioner outdoor cooling unit is realized by the same frequency noise absorption and flexible noise reduction.

[0047] Embodiment three: referring to Figs. 1-6 The embodiment combines embodiments one and two to form a fan vibration and noise reduction method applied to the air conditioner outdoor cooling unit, including the following processes and principles:

[0048] a: the outer machine plate 1 and the machine frame 3 are sleeved outside the inner machine frame 2, and at the same time, the abutting plate 11 and the contact block 12 are attached to the docking groove 8 on the inner machine frame 2, and then the positioning screw 5 is screwed into the open threaded hole 7 until the abutting plate 11 is fixed, at this time, the mounting hole 17 on the positioning screw 5 is exposed, and the outer machine plate 1, the inner machine frame 2 and the machine frame 3 can be connected to the main body of the air conditioner outdoor unit through the bolt attached to the mounting hole 17, and the installation is completed;

[0049] b: when the fan assembly 4 in the air conditioner outdoor cooling unit rotates, the inner machine frame 2 is a "wind guide ring structure", when the fan blades in the fan assembly 4 rotate to generate vibration noise, the air forms a "piston" movement through the narrow neck opening 15, and is significantly amplified at a specific frequency, so as to consume sound energy and realize sound absorption;

[0050] c1: when the fan assembly 4 rotates in the cooling unit of the air conditioner outdoor unit, the sound insulation structure is formed by the combination of the bonding plate 11 and the contact block 12, which provides flexible connection and can avoid the vibration noise problem between the outdoor unit plate 1 and the indoor unit frame 2 when the fan assembly 4 rotates at high speed;

[0051] c2: when the fan assembly 4 rotates in the cooling unit of the air conditioner outdoor unit, the at least four resonance cavity structures are uniformly distributed on the outside of the indoor unit frame 2, and the setting of at least six resonance cavities 16 in each resonance cavity structure can effectively perform the vibration noise elimination of the circumferential "air guide ring" structure of the fan assembly 4. The vibration noise generated by the high-speed rotation of the fan assembly 4 is eliminated by the resonance cavity 16, which avoids the harm caused by the acoustic resonance in the cooling unit of the air conditioner outdoor unit.

[0052] As shown above: based on the principle of "Helmholtz resonance cavity structure", the number of resonance cavity structures is determined according to the peak frequency of the discrete noise to be absorbed, which can not only absorb multiple resonance frequency peaks at the same time but also has good broadband sound absorption performance; and on the basis of adding "Helmholtz resonance cavity structure", the synchronous addition of sound insulation structure is also used in the form of flexible noise elimination to absorb sound of the same frequency, which realizes the stable damping and noise reduction effect of the cooling unit of the air conditioner outdoor unit.

[0053] The above content is only an example and description of the structure of the present application. Those skilled in the art can make various modifications or supplements or use similar ways to replace the described specific embodiments, as long as they do not deviate from the structure of the invention or exceed the scope defined by the present claims, which shall belong to the protection scope of the present application.

Claims

1. A fan vibration reduction and noise reduction device applied in an outdoor cooling unit of an air conditioner, comprising an indoor unit frame (2) and an outdoor unit panel (1), characterized in that: A fan assembly (4) is provided in the middle of the inner frame (2), and the outer ring side of the inner frame (2) is curved outward and is covered with at least four resonant cavity structures at intervals. The resonant cavity structure includes a sound-absorbing box (13) connected to the inner frame (2), and a sealing plate (10) is attached to the outside of the sound-absorbing box (13). The interior of the sound-absorbing box (13) is divided into at least six resonant cavities (16) by a partition (14). The inner frame (2) has a through hole (6) that communicates with the resonant cavity (16), and the sound-absorbing box (13) has a narrow neck opening (15) corresponding to the through hole (6).

2. The fan vibration reduction and noise reduction device applied in the outdoor cooling unit of an air conditioner according to claim 1, characterized in that, The outer unit panel (1) is fitted onto the outside of the inner unit frame (2) and has the same width. A frame (3) connected to the fan assembly (4) is installed on the rear side of the outer unit panel (1).

3. The fan vibration reduction and noise reduction device applied in the outdoor cooling unit of an air conditioner according to claim 2, characterized in that, The outer side of the inner frame (2) is provided with an open screw hole (7) and a docking groove (8). The inner ring side of the outer plate (1) is provided with a contact block (12). The outer side of the contact block (12) is provided with a fitting plate (11) that matches the docking groove (8). The outer end of the fitting plate (11) is provided with a positioning screw (5) that meshes with the open screw hole (7).

4. The fan vibration reduction and noise reduction device applied in the outdoor cooling unit of an air conditioner according to claim 3, characterized in that, The two adjacent sound-absorbing boxes (13) form an outer mounting groove (9), and the open screw hole (7) and the mating groove (8) are located in the middle of both sides of the outer mounting groove (9).

5. The fan vibration reduction and noise reduction device applied in the outdoor cooling unit of an air conditioner according to claim 1, characterized in that, Each of the resonant cavities (16) has a different length in the circumferential direction, and each through hole (6) and narrow neck (15) is located in the middle of the resonant cavity (16).

6. The fan vibration reduction and noise reduction device applied in the outdoor cooling unit of an air conditioner according to claim 5, characterized in that, The through hole (6) and the narrow neck (15) have the same shape, which can be a circle, a square or any closed curve and a combination thereof.

7. The fan vibration reduction and noise reduction device applied in the outdoor cooling unit of an air conditioner according to claim 4, characterized in that, The positioning screw (5) has a mounting hole (17) in the middle of its outer end. The mounting hole (17) is used for the connection between the outdoor unit plate (1), the indoor unit frame (2) and the main body of the outdoor unit of the air conditioner.

8. A method for reducing fan vibration and noise in an outdoor cooling unit of an air conditioner, comprising the fan vibration and noise reduction device as described in any one of claims 1-7, characterized in that, Includes the following steps: a: Place the outdoor unit panel (1) and frame (3) on the outside of the inner unit frame (2), and at the same time attach the mating plate (11) and contact block (12) to the mating groove (8) on the inner unit frame (2). Then use the positioning screw (5) to screw it in through the open screw hole (7) until the mating plate (11) is fixed. At this time, the mounting hole (17) on the positioning screw (5) is exposed, and the outdoor unit panel (1), inner unit frame (2) and frame (3) can be connected to the main body of the air conditioner outdoor unit by bolts through the mounting hole (17). The installation is now complete. b: When the fan assembly (4) in the cooling unit of the outdoor unit of the air conditioner rotates, the indoor unit frame (2) is a "wind guide ring structure". When the fan blades in the fan assembly (4) rotate and generate vibration noise, the air flows through the narrow neck (15) to form a "piston" motion, which is significantly amplified at a specific frequency, thereby consuming sound energy to achieve sound absorption. c1: When the fan assembly (4) in the cooling unit of the outdoor unit of the air conditioner rotates, the bonding plate (11) and the contact block (12) together form a sound liner structure, which provides a flexible connection and can also avoid the vibration and noise problem between the outdoor unit plate (1) and the inner unit frame (2) when the fan assembly (4) rotates at high speed. c2: When the fan assembly (4) in the cooling unit of the outdoor unit of the air conditioner rotates, at least four resonant cavity structures are evenly distributed on the outside of the inner frame (2), and each resonant cavity structure contains at least six resonant cavities (16). This configuration can effectively reduce the vibration noise of the "air guide ring" structure in the circumference of the fan assembly (4). The vibration noise generated when the fan assembly (4) rotates at high speed is reduced by the resonant cavity (16), thus avoiding the harm caused by acoustic resonance in the cooling unit of the outdoor unit of the air conditioner.

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