Vehicle road noise improvement device

Abstract

The present invention discloses a vehicle road noise improvement device, which relates to the technical field of vehicle noise control, wherein the vehicle road noise improvement device comprises a vehicle body sheet metal, a vibration acceleration sensor and a control component, wherein the vehicle body sheet metal is provided with a cavity having an opening; the vibration acceleration sensor is arranged on the vehicle body sheet metal and is used to detect the acceleration of the vehicle body sheet metal; the control component comprises a container and a pump body, wherein the pump body is connected with the container and the opening of the cavity, the pump body can pump the fluid in the container into the cavity, and the pump body is electrically connected with the vibration acceleration sensor; the present invention can dynamically inject or discharge fluid into or out of the cavity through the combination of the vibration acceleration sensor and the pump body to adapt to different driving conditions and noise levels, and such dynamic adjustment allows the device to adjust the fluid volume according to real-time vibration data to optimize the noise control effect.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle noise control, and in particular to a vehicle road noise improvement device. Background Art

[0002] In the automotive field, the control of road noise is one of the key issues to improve driving comfort. Road noise mainly comes from the friction between tires and the road surface, air flow and vibration of the vehicle structure during driving. These noises are usually transmitted into the vehicle through doors, trunks, front fenders and other parts, affecting the comfort and driving experience of passengers.

[0003] Traditional methods of improving road noise mainly include strengthening the vehicle body structure, sticking damping sheets on the floor, and sticking reinforcing sheets on the vehicle body roof and side panels. Although these measures can reduce noise to a certain extent, most traditional methods, such as sticking damping sheets, are static solutions and are difficult to adapt to different driving conditions and noise levels. Therefore, existing technologies are still insufficient in terms of dynamic noise control and adaptability, and innovative solutions are urgently needed to improve the noise isolation effect and overall comfort of vehicles. Summary of the invention

[0004] The main purpose of the present invention is to provide a vehicle road noise improvement device, aiming to provide a device for dynamically adjusting and controlling road noise.

[0005] To achieve the above-mentioned purpose, the vehicle road noise improvement device proposed by the present invention comprises:

[0006] A body sheet metal, wherein the body sheet metal is provided with a cavity having an opening;

[0007] a vibration acceleration sensor, the vibration acceleration sensor being disposed on the body sheet metal and used for detecting the acceleration of the body sheet metal; and

[0008] The control component includes a container and a pump body, wherein the pump body is connected to the container and an opening of the cavity, the pump body can pump the fluid in the container into the cavity, and the pump body is electrically connected to the vibration acceleration sensor.

[0009] In one embodiment, the control assembly includes a controller and a pipeline, the pipeline is connected to the pump body and the opening of the cavity, and the controller is electrically connected to the vibration acceleration sensor and the pump body.

[0010] In one embodiment, the vehicle road noise improvement device includes a soft storage bin, which is disposed in the cavity, and the soft storage bin is provided with a cavity having a liquid inlet, the liquid inlet is connected to the opening, and the soft storage bin is used to store the fluid.

[0011] In one embodiment, the soft storage bin is made of rubber.

[0012] In one embodiment, the vehicle body sheet metal includes a sheet metal body and a cover body, and a first receiving groove with a notch is provided on a side of the sheet metal body facing the cover body; the cover body covers the notch of the first receiving groove and is enclosed with the sheet metal body to form the receiving cavity, and a side wall of the first receiving groove is provided with an opening of the receiving cavity.

[0013] In one embodiment, a positioning protrusion is formed on the bottom wall of the containing groove, and a positioning groove is formed on the cover body, and the positioning protrusion is limited in the positioning groove.

[0014] In one embodiment, an outer peripheral wall of the positioning protrusion is formed with a guiding inclined section.

[0015] In one embodiment, the bottom wall of the first containing groove is formed with a plurality of the positioning protrusions, the cover body is provided with a plurality of the positioning grooves, a second containing groove for accommodating the fluid is formed between any two adjacent positioning protrusions, and a plurality of the second containing grooves are connected to form the first containing groove.

[0016] In one embodiment, each of the second containing grooves has a plurality of bending sections.

[0017] In one embodiment, the vehicle body sheet metal is spaced to form a plurality of the cavities, the vehicle road noise improvement device includes a plurality of the vibration acceleration sensors, the control component includes a plurality of the pump bodies, each of the vibration acceleration sensors is disposed on the outer wall of a cavity, a plurality of the pump bodies are connected to the container, each of the pump bodies is communicated with an opening of the cavity, and is electrically connected to a vibration acceleration sensor.

[0018] In the technical solution of the present invention, when the vibration acceleration sensor detects that the acceleration of the body sheet metal exceeds the set threshold, the vibration acceleration sensor will output a signal to the pump body. After receiving the signal, the pump body pumps the fluid in the container into the cavity. The pump body can control the amount of fluid pumped into the cavity according to the acceleration detected by the vibration acceleration sensor (the greater the acceleration detected by the vibration acceleration sensor, the more fluid is pumped into the cavity); after the cavity is opened in the body sheet metal and the fluid is injected, the surface stiffness of the cavity wall is increased (surface stiffness refers to the stiffness of the material or structure in the in-plane direction, reflecting its ability to resist deformation). The addition of fluid improves the damping and quality of the overall structure, thereby improving The surface stiffness is improved. The greater the surface stiffness, the smaller the deformation of the body sheet metal. At the same time, the vibration amplitude of the body sheet metal will also be reduced, thereby reducing the noise generated. When the body sheet metal vibrates during vehicle driving, more vibration energy can be absorbed by the fluid, which also reduces the noise generation. By adjusting the amount of fluid in the cavity through the pump body, the resonant frequency of the structure can be adjusted to deviate from the excitation frequency that may cause resonance, thereby reducing noise. Through the combination of the vibration acceleration sensor and the pump body, the fluid can be dynamically injected or discharged into the cavity to adapt to different driving conditions and noise levels. This dynamic adjustment allows the device to adjust the fluid volume according to real-time vibration data to optimize the noise control effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 A structural schematic diagram of an embodiment of a sheet metal body is provided for the present invention;

[0021] Figure 2 A structural schematic diagram of an embodiment of a cover body is provided for the present invention.

[0022] Description of Figure Numbers:

[0023] 100. Vehicle road noise improvement device; 1. sheet metal body; 11. first receiving groove; 12. positioning convex portion; 13. guiding inclined section; 14. second receiving groove; 2. cover body; 21. positioning groove.

[0024] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0027] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0028] The present invention provides a vehicle road noise improvement device 100 .

[0029] See also Figure 1 and Figure 2 In one embodiment of the present invention, the vehicle road noise improvement device 100 includes a body sheet metal, a vibration acceleration sensor and a control component, wherein the body sheet metal is provided with a cavity having an opening; the vibration acceleration sensor is arranged on the body sheet metal and is used to detect the acceleration of the body sheet metal; the control component includes a container and a pump body, the pump body is connected to the container and the opening of the cavity, the pump body can pump the fluid in the container into the cavity, and the pump body is electrically connected to the vibration acceleration sensor.

[0030] In the technical solution of the present invention, when the vibration acceleration sensor detects that the acceleration of the body sheet metal exceeds the set threshold, the vibration acceleration sensor will output a signal to the pump body. After receiving the signal, the pump body pumps the fluid in the container into the cavity. The pump body can control the amount of fluid pumped into the cavity according to the acceleration detected by the vibration acceleration sensor (the greater the acceleration detected by the vibration acceleration sensor, the more fluid is pumped into the cavity); after the fluid is injected into the cavity of the body sheet metal, the surface stiffness of the cavity wall of the cavity is increased (surface stiffness refers to the stiffness of the material or structure in the in-plane direction, reflecting its ability to resist deformation). The addition of fluid increases the damping and quality of the overall structure, thereby improving The surface stiffness is increased. The greater the surface stiffness, the smaller the deformation of the body sheet metal. At the same time, the vibration amplitude of the body sheet metal will also be reduced, thereby reducing the noise generated. When the body sheet metal vibrates during vehicle driving, more vibration energy can be absorbed by the fluid, which also reduces the noise generation. By adjusting the amount of fluid in the cavity through the pump body, the resonant frequency of the structure can be adjusted to deviate from the excitation frequency that may cause resonance, thereby reducing noise. Through the combination of the vibration acceleration sensor and the pump body, the fluid can be dynamically injected or discharged into the cavity to adapt to different driving conditions and noise levels. This dynamic adjustment allows the device to adjust the fluid volume according to real-time vibration data to optimize the noise control effect.

[0031] In order to accurately control the amount of fluid pumped into the pump body, in one embodiment of the present invention, the control component includes a controller and a pipeline, the pipeline is connected to the pump body and the opening of the cavity, and the controller is electrically connected to the vibration acceleration sensor and the pump body. When the vehicle is running, the vibration acceleration sensor detects the vibration acceleration of the body sheet metal, and the vibration acceleration sensor sends the detected data to the controller. The controller processes these data according to the preset threshold and control algorithm. If the vibration acceleration exceeds the set threshold, the controller will send a control signal to the pump body to instruct the pump body to start working. After receiving the signal, the pump body pumps the fluid in the container into the cavity through the pipeline, thereby increasing the surface stiffness of the body sheet metal and reducing vibration and noise; the pump body can be an electric pump or a pneumatic pump, and the present invention does not limit this. The pump body transports the fluid from the container to the cavity according to the instructions of the controller; the controller can accurately control the operation of the pump body, ensure the accurate delivery of the fluid, and improve the response speed and control accuracy of the system; the integrated design of the control component simplifies the installation and maintenance of the system, improves the reliability and stability of the system, and the system can also be dynamically adjusted according to different driving conditions and noise levels, providing a high degree of flexibility and adaptability.

[0032] In order to further improve the noise reduction effect of the vehicle body sheet metal, in one embodiment of the present invention, the vehicle road noise improvement device 100 includes a soft storage bin, which is arranged in the cavity, and the soft storage bin is provided with a cavity with a liquid inlet, and the liquid inlet is connected to the opening, and the soft storage bin is used to store the fluid. The soft storage bin is built into the cavity and connected to the opening of the cavity through its liquid inlet, allowing the fluid to flow into or out of the cavity under the control of the control component. When the vibration acceleration sensor detects that the vibration of the body sheet metal exceeds the set threshold, the control component (such as the pump body and the controller) will start, and the pump body will pump the fluid from the container into the cavity through the liquid inlet. The addition of the fluid increases the damping and mass of the sheet metal, thereby improving the surface stiffness of the sheet metal, reducing vibration and noise generated. The design of the soft storage bin allows it to swing freely in the cavity, further absorbing vibration energy and improving the overall shock absorption effect. The soft storage bin is a key component of the vehicle road noise improvement device 100. It is made of rubber or other soft materials, has good flexibility and elasticity, and the shock absorption performance of the soft material It can effectively reduce the vibration and noise during vehicle driving. Rubber or other soft materials usually have a long service life and good chemical corrosion resistance, and are suitable for use in vehicle environments. In addition, setting a soft storage bin in the cavity can reduce the requirements for the sealing of the cavity. The cavity does not require extremely high sealing, which can simplify its structural design and reduce the complexity and cost of the manufacturing process. Lowering the sealing requirements may mean that thinner materials or simpler structures can be used, thereby reducing the overall weight of the vehicle. The sealing requirements for the cavity are not high, and the maintenance requirements for the sealing of the cavity are low, which makes it more convenient to repair and replace the soft storage bin. The soft storage bin can be designed to deform within a certain range without losing its function to adapt to cavities of different shapes or sizes.

[0033] Specifically, in one embodiment of the present invention, the material of the soft storage bin is rubber. Rubber itself has good sealing properties. Even when the sealing requirements of the cavity are reduced, the storage bin made of rubber can still provide sufficient sealing protection to prevent fluid leakage; rubber is a material with excellent shock absorption performance, which can effectively absorb vibrations, thereby reducing noise generation; rubber is durable and can withstand long-term use and repeated deformation without damage, extending the service life of the storage bin; rubber has good resistance to a variety of chemicals, including oils and other fluids that may be used to adjust stiffness, ensuring the stability and reliability of the storage bin; the high damping properties of rubber help reduce the spread of vibrations and convert vibration energy into heat energy, thereby reducing noise; storage bins made of rubber are simple to maintain and not easy to break, reducing maintenance costs and potential replacement needs, and rubber has a low density. Storage bins made of rubber help reduce the overall weight of the vehicle, thereby improving fuel efficiency.

[0034] See also Figure 1 and Figure 2 In one embodiment of the present invention, the vehicle body sheet metal includes a sheet metal body 1 and a cover body 2. The sheet metal body 1 is provided with a first receiving groove 11 with a notch on one side facing the cover body 2. The cover body 2 is provided on the notch of the first receiving groove 11 and is enclosed with the sheet metal body 1 to form the receiving cavity. The opening of the receiving cavity is provided on one side wall of the first receiving groove 11. The design of the sheet metal body 1 and the cover body 2 facilitates the processing to form the receiving cavity, optimizes the structure of the receiving cavity, and makes it more stable and reliable. The close combination of the cover body 2 and the sheet metal body 1 ensures the sealing of the receiving cavity and prevents fluid leakage. The design of the receiving cavity opening allows the fluid in the receiving cavity to be easily replaced or supplemented. By adjusting the amount of fluid in the receiving cavity, noise can be effectively reduced and the riding comfort of the vehicle can be improved.

[0035] See also Figure 1 and Figure 2 In one embodiment of the present invention, a positioning protrusion 12 is formed on the bottom wall of the container, and a positioning groove 21 is formed on the cover body 2, and the positioning protrusion 12 is limited in the positioning groove 21. The positioning groove 21 is a concave structure on the cover body 2, which is used to match the positioning protrusion 12 on the sheet metal body 1 to ensure the correct installation and positioning of the cover body 2. The positioning protrusion 12 is limited in the positioning groove 21. This matching method can ensure the precise alignment of the cover body 2 during installation and prevent the rotation or movement of the cover body 2; during the assembly process, the positioning groove 21 of the cover body 2 and the positioning protrusion 12 on the sheet metal body 1 cooperate with each other to achieve precise positioning. This cooperation not only ensures the correct installation position of the cover body 2, but also helps to form a sealed container to prevent fluid leakage. The limit matching mechanism also provides additional stability to ensure that the cover body 2 will not loosen or shift due to vibration during the driving of the vehicle. Due to the stability and reliability of the positioning mechanism, the maintenance and replacement requirements caused by loosening or leakage of the cover body 2 are reduced.

[0036] See also Figure 1In one embodiment of the present invention, the outer peripheral wall of the positioning protrusion 12 is formed with a guiding oblique section 13. The guiding oblique section 13 is a design feature of the outer peripheral wall of the positioning protrusion 12, which forms an inclined surface or section for guiding the cover body 2 to be correctly installed on the sheet metal body 1; during the assembly process, the positioning groove 21 of the cover body 2 slides along the guiding oblique section 13 of the positioning protrusion 12 until the positioning protrusion 12 is completely confined in the positioning groove 21. The design of the guiding oblique section 13 helps to simplify the assembly process, reduce the difficulty of assembly, and ensure that the cover body 2 can be smoothly and accurately aligned with the sheet metal body 1; the smooth transition of the guiding oblique section 13 reduces the friction and damage between the parts during the assembly process, which helps to extend the service life of the product; precise positioning helps to ensure the sealing between the cover body 2 and the sheet metal body 1, prevent fluid leakage, and because the assembly process is smoother, the need for maintenance and replacement due to improper assembly is reduced. The simplified assembly process helps to improve the efficiency of the production line and reduce production time and cost.

[0037] See also Figure 1 and Figure 2 In one embodiment of the present invention, the bottom wall of the first receiving groove 11 is formed with a plurality of the positioning protrusions 12, the cover body 2 is provided with a plurality of the positioning grooves 21, and a second receiving groove 14 for accommodating the fluid is formed between any two adjacent positioning protrusions 12, and the plurality of the second receiving grooves 14 are connected to form the first receiving groove 11. During the assembly process, the positioning groove 21 of the cover body 2 slides along the guiding inclined section 13 of the positioning protrusion 12 until the positioning protrusion 12 is completely confined in the positioning groove 21 to form a sealed receiving cavity. The fluid enters the second tank 14 through the opening of the first tank 11. When the vibration acceleration sensor detects that the vibration exceeds the set threshold, the control component will start the pump body to pump the fluid into the cavity, thereby increasing the surface stiffness of the body sheet metal and reducing vibration and noise. The design of multiple positioning protrusions 12 and positioning grooves 21 improves the positioning accuracy and sealing between the cover body 2 and the sheet metal body 1. The design of the second tank 14 provides a flexible fluid containment and distribution method, which helps to more effectively adjust the stiffness of the sheet metal. The design of multiple positioning protrusions 12 and positioning grooves 21 enhances the stability of the overall structure and reduces noise caused by vibration. The design of the positioning protrusions 12 and positioning grooves 21 simplifies the assembly process, making the installation of the cover body 2 faster and more accurate. The precise positioning and sealing reduce the need for maintenance and replacement due to improper assembly or leakage.

[0038] See also Figure 1In one embodiment of the present invention, each of the second containing grooves 14 has a plurality of bending sections. When the control component starts the pump body according to the signal of the vibration acceleration sensor, the fluid is pumped into the curved second containing groove 14, and the fluid flows in the plurality of bending sections. The extension of its path helps the fluid to absorb and disperse the vibration energy more effectively. The flow of the fluid in the plurality of bending sections also helps to reduce the impact of the fluid on the cavity wall, thereby reducing noise; the plurality of bending sections can increase the resistance of the fluid flow, thereby improving its shock absorption efficiency, and the plurality of bending sections help the fluid to be evenly distributed throughout the cavity, ensuring that the sheet metal rigidity of all areas is effectively adjusted. The design of the plurality of bending sections helps to reduce the turbulence and noise generated during the flow of the fluid, thereby reducing the overall noise level of the vehicle. The plurality of bending sections can increase the flow resistance of the fluid, which helps to maintain the stability of the fluid in the cavity during the driving of the vehicle.

[0039] In one embodiment of the present invention, the vehicle body sheet metal is spaced to form a plurality of the cavities, the vehicle road noise improvement device 100 includes a plurality of the vibration acceleration sensors, the control component includes a plurality of the pump bodies, each of the vibration acceleration sensors is disposed on the outer wall of a cavity, a plurality of the pump bodies are connected to the container, each of the pump bodies is communicated with an opening of the cavity, and is electrically connected to a vibration acceleration sensor. When a vehicle is traveling on an uneven road, the outer walls of each cavity will vibrate due to the bumps in the road. The vibration acceleration sensor installed on the outer wall of the cavity monitors and records the vibration data in real time. The control component transports the fluid from the container to the corresponding cavity through the pump body according to the data provided by the sensor. If the vibration in a certain area exceeds the preset threshold, the corresponding pump body will start and pump the fluid into the cavity in that area to increase the stiffness of the body sheet metal and reduce vibration and noise. The design of multiple sensors and pump bodies allows the system to be distributed controlled and can be precisely adjusted according to the vibration conditions of different parts of the vehicle. Generally speaking, the stiffness of the middle part of the body sheet metal may be lower than that of the two ends, making the middle area more prone to vibration, and the center of gravity of the vehicle is usually located in the middle of the body sheet metal, causing the middle area to be subjected to greater vibration. The vehicle road noise improvement device By opening more cavities in the middle area of ​​the body sheet metal and installing more vibration acceleration sensors and pump bodies, the vibration conditions can be monitored in real time and adjusted to reduce vibration and noise. This distributed control strategy can provide more precise vibration control to ensure the comfort of vehicle driving. By dynamically adjusting the fluid volume in the middle area, the stiffness of the area can be effectively increased, vibration can be reduced, and the overall noise level can be improved. The system can respond to the vibration conditions in different areas in real time and quickly adjust the fluid volume to optimize the noise control effect. The design provides a high degree of flexibility and adaptability and can be dynamically adjusted according to actual driving conditions and noise levels. By reducing vibration and noise during vehicle driving, ride comfort is significantly improved. Precise control and adjustment reduce component wear caused by vibration, thereby reducing maintenance costs.

[0040] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A vehicle road noise improvement device, characterized in that: include: A body sheet metal, wherein the body sheet metal is provided with a cavity having an opening; A vibration acceleration sensor, the vibration acceleration sensor is arranged on the body sheet metal and is used to detect the acceleration of the body sheet metal; as well as A control component, the control component includes a container and a pump body, the pump body is in communication with the container and an opening of the cavity, the pump body can pump the fluid in the container into the cavity, and the pump body is electrically connected to the vibration acceleration sensor; The vehicle road noise improvement device includes a soft storage bin, which is arranged in the cavity. The soft storage bin is provided with a cavity having a liquid inlet, the liquid inlet is connected to the opening, and the soft storage bin is used to store the fluid.

2. The vehicle road noise improvement device according to claim 1, characterized in that: The control assembly includes a controller and a pipeline, wherein the pipeline is connected to the pump body and the opening of the cavity, and the controller is electrically connected to the vibration acceleration sensor and the pump body.

3. The vehicle road noise improvement device according to claim 1, characterized in that: The material of the soft storage bin is rubber.

4. The vehicle road noise improvement device according to any one of claims 1 to 3, characterized in that: The vehicle body sheet metal includes a sheet metal body and a cover body, wherein a first receiving groove having a notch is provided on a side of the sheet metal body facing the cover body; the cover body covers the notch of the first receiving groove and is enclosed with the sheet metal body to form the receiving cavity, and an opening of the receiving cavity is provided on a side wall of the first receiving groove.

5. The vehicle road noise improvement device according to claim 4, characterized in that: The bottom wall of the containing groove is formed with a positioning protrusion, and the cover body is provided with a positioning groove, and the positioning protrusion is limited in the positioning groove.

6. The vehicle road noise improvement device according to claim 5, characterized in that: The outer peripheral wall of the positioning protrusion is formed with a guiding inclined section.

7. The vehicle road noise improvement device according to claim 5, characterized in that: The bottom wall of the first container is formed with a plurality of positioning protrusions, the cover body is provided with a plurality of positioning grooves, a second container for accommodating the fluid is formed between any two adjacent positioning protrusions, and a plurality of the second containers are connected to form the first container.

8. The vehicle road noise improvement device according to claim 7, characterized in that: Each of the second containing grooves has a plurality of bending sections.

9. The vehicle road noise improvement device according to any one of claims 1 to 3, characterized in that: The vehicle body sheet metal intervals form a plurality of the cavities, the vehicle road noise improvement device includes a plurality of the vibration acceleration sensors, the control component includes a plurality of the pump bodies, each of the vibration acceleration sensors is arranged on the outer wall of a cavity, a plurality of the pump bodies are connected to the container, each of the pump bodies is communicated with an opening of the cavity, and is electrically connected to a vibration acceleration sensor.

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