Noise reduction structure of wall breaking machine

Abstract

The utility model discloses a noise reduction structure of a wall breaking machine, which belongs to the technical field of wall breaking machines and is characterized in that a shell is rotatably connected with a sound insulation door, and when the sound insulation door is closed on one side of the shell, a sealed space is formed between the shell and the sound insulation door; a vibration reduction base used for containing the wall breaking machine is arranged at the bottom of the interior of the shell, the shell and the sound insulation door are manufactured through a film resonance type acoustic metamaterial, the wall breaking machine can be conveniently placed into the shell, and low-frequency electromagnetic noise at the bottom of the wall breaking machine is effectively isolated and insulated; a vibration reduction pedestal is arranged at the bottom of the shell, a particle damping vibration reduction technology is introduced through the vibration reduction pedestal, vibration energy generated by operation of the noise reduction wall breaking machine is absorbed, and noise radiation caused by vibration is reduced; the shock absorber and the pedestal which are in soft elastic connection are utilized, the low-frequency noise of the wall breaking machine is blocked, the overall weight is light, and the size is small.

Description

Technical Field

[0001] The utility model relates to the technical field of wall breaking machines, in particular to a noise reduction structure of a wall breaking machine. Background Art

[0002] Household wall breakers are multifunctional home appliances that are mainly used for heating and stirring. They are usually used to make vegetable and fruit juices, smoothies, soy milk, etc., and are favored by consumers. The main functional components of household wall breakers include a base and a mixing cup. The base assembly is provided with a motor and a heater. Although household wall breakers are popular among consumers, their shortcomings are also obvious. The main problem is that the noise is loud during operation. The internal part of the household wall breakers will produce certain vibrations under the force of rapid stirring, which aggravates the noise. At present, the existing household wall breakers usually solve this problem by only putting a silent cover on the outside of the blender, but this method can only reduce some noise and cannot achieve the ideal noise reduction effect. The noise is still large when used. The main reason is that the traditional silent cover cannot effectively isolate the low-frequency electromagnetic noise generated by the motor operation at the bottom of the household wall breakers, resulting in poor noise reduction effect. In addition, the vibration generated by the wall breakers during stirring excites the vibration of the silent cover, which then radiates noise and reduces the noise reduction effect.

[0003] At present, the blocking of low-frequency noise usually follows the "mass density control law", that is, increasing the weight of the material (i.e., surface density, or mass per unit area) to increase the sound insulation effect. The traditional sound absorption and insulation technology can effectively isolate the medium and high frequency components in the noise, while low-frequency noise has the characteristics of long propagation distance, strong sound transmission ability, and high isolation difficulty, which has always been a difficult problem in noise control. The low-frequency sound insulation of traditional sound insulation materials follows the mass control law, and it is difficult to effectively isolate low-frequency noise. In order to improve the sound insulation performance of the low-frequency band, traditional sound insulation materials are often achieved by increasing the surface density of the material. The larger the surface density, the greater the inertial resistance, the less likely the structure is to vibrate, and the sound insulation effect is improved. However, this sound insulation method is at the expense of increasing the weight of the material, which is not applicable in many occasions; low-frequency noise has a long sound wavelength, high energy, and a long propagation distance; to achieve the blocking of low-frequency noise, traditional sound insulation materials must be "thick and heavy"; but using a "thick and heavy" sound insulation structure with good low-frequency noise blocking effect on a household wall breaker is obviously not advisable; it usually affects the consumer's user experience accordingly.

[0004] Prior art, such as Chinese patent publication number CN214510877U, discloses a sound insulation and noise reduction device for a wall breaking machine, comprising a base, side panels, a wall breaking machine body, a flap and a motor, the upper surface of the base is symmetrically mounted with side panels, the upper surface of the base is mounted with a support plate, the upper end of the support plate is symmetrically mounted with fixed blocks, a rotating shaft is rotatably mounted on one side of the fixed block, a connecting plate is symmetrically mounted on the surface of the rotating shaft, two connecting plates are connected with a flap at one end facing the support plate, and the side panels, the flap and the support plates are all filled with sound-absorbing cotton, the upper surface of the base is mounted with a wall breaking machine body, the lower end of the wall breaking machine body is provided with an installation groove, and a motor is installed inside the installation groove.

[0005] The above patent improves the noise reduction function of the wall breaking machine by modifying it, but the engineering workload is large and the adaptability is poor. Utility Model Content

[0006] The utility model proposes a noise reduction structure for a wall breaking machine, and utilizes acoustic meta-material technology to achieve the purpose of lightweight sound insulation structure and obvious low-frequency sound insulation effect.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] A noise reduction structure for a wall-breaking machine comprises a shell, to which a soundproof door is rotatably connected. When the soundproof door is closed on one side of the shell, a sealed space is formed between the shell and the soundproof door. The shell and the soundproof door are both made of a thin film resonance type acoustic metamaterial. The thin film resonance type acoustic metamaterial comprises an outer plate, a thin film, a frame and a plurality of mass oscillators. A frame is provided on the inner side of the outer plate. The frame and the outer plate are clamped on both sides of the thin film. At least one mass oscillator is provided in the frame of each cell, and the mass oscillator is fixed on the thin film.

[0009] An optimal technical solution of the utility model is that a vibration-damping base for placing the wall-breaking machine is provided at the bottom of the shell.

[0010] An optimal technical solution of the utility model is that the vibration-damping base includes a pedestal for placing the wall-breaking machine and a vibration absorber, and the vibration absorber is arranged on the four corners of the bottom of the pedestal.

[0011] An optimal technical solution of the utility model is that the pedestal and the shock absorber are elastically and softly connected.

[0012] An optimal technical solution of the utility model is that the shock absorber is made of elastic soft material.

[0013] A preferred technical solution of the utility model is that the pedestal comprises a shell and damping particles, and the damping particles are filled inside the shell.

[0014] A preferred technical solution of the utility model is that the filling degree of the damping particles filled in the pedestal is between 10% and 100%.

[0015] A preferred technical solution of the utility model is that a plurality of anti-slip feet are arranged at the bottom of the shell.

[0016] A preferred technical solution of the utility model is that the inner cavity of the shell includes at least one partition, and a plurality of the partitions are arranged horizontally or vertically in the inner cavity of the shell, so that the shell is divided horizontally or vertically into a plurality of mutually isolated cavities.

[0017] An optimal technical solution of the present invention is that a handle is provided on the outer side of the soundproof door.

[0018] The beneficial effects of the utility model are:

[0019] 1. The shell and soundproof door are made of thin film resonance acoustic metamaterials, which makes it easy to place the wall breaker into the shell and effectively isolate the low-frequency electromagnetic noise at the bottom of the wall breaker;

[0020] 2. A vibration reduction base is set at the bottom of the shell. The particle damping vibration reduction technology is introduced through the vibration reduction base to absorb the vibration energy generated by the operation of the noise reduction wall breaking machine and reduce the noise radiation caused by vibration;

[0021] 3. By using the soft elastic connection between the shock absorber and the base, the low-frequency noise of the wall breaking machine can be blocked, and the overall weight is light and the size is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the noise reduction structure of the wall breaking machine provided in the specific implementation mode of the utility model;

[0023] Figure 2 It is a schematic diagram of the overall structure of the noise reduction structure of the wall breaking machine provided in the specific implementation mode of the utility model;

[0024] Figure 3 It is a top view of the overall structure of the noise reduction structure of the wall breaking machine provided in a specific embodiment of the utility model;

[0025] Figure 4 yes Figure 3 Sectional view of AA in the middle;

[0026] Figure 5 It is a schematic diagram of the overall structure of the vibration reduction base of the wall breaking machine noise reduction structure provided in a specific embodiment of the utility model;

[0027] Figure 6 It is an exploded schematic diagram of the overall structure of the film resonance type acoustic metamaterial of the wall breaking machine noise reduction structure provided in the specific embodiment of the utility model;

[0028] Figure 7 It is a side view of the overall structure of the film resonance type acoustic metamaterial of the wall breaking machine noise reduction structure provided in the specific embodiment of the utility model;

[0029] Figure 8 This is a front view of the overall structure of the thin film resonance type acoustic metamaterial of the wall breaking machine noise reduction structure provided in the specific embodiment of the utility model;

[0030] In the figure:

[0031] 1. Shell; 101. Soundproof door; 1011. Handle; 102. Anti-slip foot; 2. Vibration-damping base; 201. Base; 2011. Shell; 2012. Damping particles; 202. Shock absorber; 3. Outer panel; 4. Film; 5. Frame; 6. Mass oscillator; 7. Wall breaker. DETAILED DESCRIPTION

[0032] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0033] like Figure 1-5 As shown, the utility model provides a noise reduction structure for a wall breaking machine, whose main sound insulation functional components are a shell 1 made of a thin film resonance type acoustic metamaterial with sound insulation effect and a sound insulation door 101 also made of a thin film resonance type acoustic metamaterial with sound insulation effect. The sound insulation door 101 is rotatably connected to one side of the shell 1. When the sound insulation door 101 covers the outer side of the shell 1, the two are tightly matched to form a sealed space. By placing the wall breaking machine 78 into the shell 1 and then closing the sound insulation door 101, the noise reduction and sound insulation effect can be achieved.

[0034] The soundproof door 101 and the shell 1 mainly use thin film resonance type acoustic metamaterials such as Figure 6-8, including an outer plate 3, a frame 5, a film 4, and a mass oscillator 6. It is mainly composed of two layers of frames 5 with a layer of film 4 sandwiched between them. The mass oscillator 6 is arranged in the middle of each cell in the frame 5 and fixed to the film 4. The outer plates 3 are fixed on both sides of the two layers of frames 5 to form a sandwich protection effect. After the frame 5 is fixed to the film 4, the film 4 has a set tension. The mass oscillator 6 is fixed to the film 4 to form a mass at a specific point on the film 4. The whole system forms a "spring-mass" vibration system, so that its resonant frequency is the low-frequency electromagnetic noise frequency generated when the wall breaker 7 is running. When the low-frequency electromagnetic noise frequency generated by the wall breaker 7 is "matched" with the resonant frequency of the designed acoustic meta-structure material sound insulation shell, the "spring-mass" vibration system composed of the frame 5, the film 4 and the mass oscillator 6 will resonate; the low-frequency electromagnetic sound wave energy generated by the wall breaker 7 when it is running will be converted into the strain energy of the film 4 to block the sound wave transmission effect.

[0035] In order to increase the noise reduction function of the noise reduction mechanism, a vibration reduction base 2 for placing the wall breaking machine 7 is also provided at the bottom of the shell 1. The vibration reduction base 2 includes a pedestal 201 and a vibration damper 202. The vibration damper 202 is arranged at the four corners of the bottom of the pedestal 201. The pedestal 201 includes a shell 2011 and damping particles 2012. The damping particles 2012 are filled in the shell 2011. When the wall breaking machine 7 is running, the vibration generated is transmitted to the damping particles 2012 to generate collision and friction. The damping particles 2012 convert the kinetic energy generated by the vibration into the elastic energy and thermal energy of the damping particle 2012 system, which will effectively reduce the transmission of vibration energy. For different models of wall breaking machines 7, the damping particles 2012 filled in the pedestal 201 are optimized. The optimization details are that the inner cavity of the shell 2011 can be isolated into at least two isolation cavities in the horizontal and vertical directions through a partition as needed, and each isolation cavity is filled with damping particles 2012 with the same or different characteristics. The material, shape, size, density, surface restitution coefficient and surface friction factor of the damping particles 2012 may be the same or different. The filling rate of the damping particles 2012 is 10% to 100%. The specific filling characteristics of the damping particles 2012 may be selected according to actual needs.

[0036] In order to achieve a better vibration reduction effect of the vibration-damping base 2, the vibration absorber 202 supports the base 201 and the sound-insulating shell 1 made of a thin film resonance type acoustic meta-structure material, so that the vibration absorber 202 and the base 201 are elastically and softly connected. Specifically, the vibration absorber 202 is made of elastic soft material, such as silicone material. On the one hand, the vibration generated during the operation of the wall breaker 7 is reduced to reduce the influence of the natural frequency of the "spring-mass" vibration system in the sound-insulating shell 1 made of a thin film resonance type acoustic meta-structure material; on the other hand, the elastic soft connection can block the vibration noise generated during the operation of the wall breaker 7 from radiating outward.

[0037] In order to enhance the stability of the shell 1, an anti-skid foot 102 is arranged on the outside of the shell 1. The anti-skid foot 102 is also arranged by damping, so that the whole structure can be anti-skid and stable during use, and its damping can further block the propagation of vibration noise.

[0038] The present invention is described by preferred embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited to the specific embodiments disclosed herein, and other embodiments falling within the claims of this application are within the scope of protection of the present invention.

Claims

1. A noise reduction structure for a wall breaking machine, characterized in that: The invention comprises a shell (1), a soundproof door (101) being rotatably connected to the shell (1), and when the soundproof door (101) is closed on one side of the shell (1), a sealed space is formed between the shell (1) and the soundproof door (101), and the shell (1) and the soundproof door (101) are both made of a thin film resonance type acoustic metamaterial; The thin film resonance type acoustic metamaterial comprises an outer plate (3), a thin film (4), a frame (5) and a plurality of mass oscillators (6); the frame (5) is arranged on the inner side of the outer plate (3); the frame (5) and the outer plate (3) are clamped on both sides of the thin film (4); at least one mass oscillator (6) is arranged in the frame (5) of each unit cell; and the mass oscillator (6) is fixed on the thin film (4).

2. The noise reduction structure of the wall breaking machine according to claim 1 is characterized in that: The bottom of the shell (1) is provided with a vibration-damping base (2) for placing the wall-breaking machine.

3. The noise reduction structure of the wall breaking machine according to claim 2 is characterized in that: The vibration-damping base (2) comprises a pedestal (201) for placing the wall-breaking machine and a vibration damper (202), wherein the vibration damper (202) is arranged at four corners of the bottom of the pedestal (201).

4. The noise reduction structure of the wall breaking machine according to claim 3 is characterized in that: The pedestal (201) and the vibration damper (202) are elastically and softly connected.

5. The noise reduction structure of a wall breaking machine according to claim 4, characterized in that: The vibration damper (202) is made of elastic soft material.

6. The noise reduction structure of a wall breaking machine according to claim 4, characterized in that: The pedestal (201) comprises an outer shell (2011) and damping particles (2012), wherein the damping particles (2012) are filled inside the outer shell (2011).

7. The noise reduction structure of a wall breaking machine according to claim 6, characterized in that: The filling degree of the damping particles (2012) filled in the pedestal (201) is between 10% and 100%.

8. The noise reduction structure of a wall breaking machine according to claim 1, characterized in that: The bottom of the housing (1) is provided with a plurality of anti-slip feet (102).

9. The noise reduction structure of a wall breaking machine according to claim 6, characterized in that: The inner cavity of the outer shell (2011) comprises at least one partition, and a plurality of the partitions are arranged transversely or vertically in the inner cavity of the outer shell (2011), so that the outer shell (2011) is divided transversely or vertically into a plurality of mutually isolated cavities.

10. The noise reduction structure of a wall breaking machine according to claim 1, characterized in that: A handle (1011) is provided on the outer side of the soundproof door (101).

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