Noise reduction detection device of silencer

Abstract

The utility model discloses a noise reduction detection device of a silencer, and belongs to the technical field of silencer detection. The device comprises an array detection assembly, the array detection assembly comprises a plurality of foldable folding frame bodies, a detection unit and a bendable connecting unit, and the detection unit comprises a first sound sensor used for detecting low-range noise and a second sound sensor used for detecting high-range noise. The measuring ranges of the first sound sensor and the second sound sensor are partially overlapped; the first sound sensor and the second sound sensor are respectively connected with the top of the folding frame body; the plurality of folding frame bodies are connected end to end through the connecting units, and the plurality of folding frame bodies can be arranged to form an annular array for enclosing a silencer to be detected. According to the utility model, the sound sensors can be arranged in all directions of the to-be-detected silencer, noise of the to-be-detected silencer in different directions can be accurately detected, and full-scale detection requirements can be met.

Description

Technical Field

[0001] This utility model relates to the field of muffler testing technology, and in particular to a noise reduction testing device for mufflers. Background Technology

[0002] Industrial silencers are suitable for any industry, including factories, mines, enterprises, and units. For example, they can reduce noise from various equipment such as fans, boilers, generators, water pumps, steam turbines, deaerators, expansion tanks, safety valves, pipelines, pipe flushing, steam equipment, air compressors, and gas emissions.

[0003] In some specialized fields, noise levels need to be measured in all directions from the muffler to ensure that the noise at different locations relative to the muffler is below a predetermined value. Furthermore, the muffler's noise level must be within the range of 20dB-150dB.

[0004] Existing noise detection devices can only detect noise from a single direction, making it difficult to accurately detect noise from different directions around the muffler. Furthermore, common noise sensors operate within a range of 30-120 dB, while custom-made sensors cover a wider range of 20-150 dB, resulting in long lead times and extremely high costs. Utility Model Content

[0005] In view of this, it is necessary to provide a noise reduction detection device for mufflers to solve the problems that traditional detection devices can only collect data in one direction, which cannot meet the comprehensive evaluation requirements of the circumferential noise reduction performance of mufflers, and that wide-range noise sensors are expensive and have long delivery cycles.

[0006] This utility model provides a noise reduction detection device for a muffler, comprising: an array detection assembly, the array detection assembly including multiple foldable frames, a detection unit, and a bendable connecting unit, the detection unit including a first sound sensor for detecting low-range noise and a second sound sensor for detecting high-range noise, the ranges of the first sound sensor and the second sound sensor overlapping; the first sound sensor and the second sound sensor are respectively connected to the top of the foldable frames; the multiple foldable frames are connected end to end through the connecting unit, and the multiple foldable frames can be arranged to form a ring array for enclosing the muffler to be tested.

[0007] Furthermore, the range of the first sound sensor is 10dB~50dB.

[0008] Furthermore, the range of the second acoustic bed sensor is 40dB~150dB.

[0009] Furthermore, the connecting unit includes multiple hinged links, and the links at both ends are detachably connected to the two adjacent folding frames via brackets.

[0010] Furthermore, the connecting unit includes multiple connecting plates that are hinged to each other. The connecting plates are rotatably connected to each other by pins, and the connecting plates at both ends are detachably connected to the two adjacent folding frames by brackets.

[0011] Furthermore, the folding frame includes three support frames and multiple scissor folding frames. The three support frames are arranged vertically and spaced apart from each other. The three support frames are connected by the scissor folding frames. The distance between the three support frames can be adjusted synchronously to enable the connecting frame to be unfolded or folded.

[0012] Furthermore, the tops of the two support frames located on both sides are respectively connected to the first sound sensor and the second sound sensor; the bottoms of the two support frames located on both sides are provided with casters.

[0013] Furthermore, the ring array is a regular polygon.

[0014] Furthermore, it also includes a control center for acquiring and processing signals, which is electrically connected to a plurality of the first sound sensors and the second sound sensors via wires, and the control center is connected to one of the folding frames.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] (1) A noise reduction detection device for a muffler according to the present invention is provided with an array detection component. The array detection component includes multiple folding frames, detection units and bendable connecting units. The detection unit includes a first sound sensor and a second sound sensor for detecting low-range noise and a second sound sensor for detecting high-range noise. The ranges of the first sound sensor and the second sound sensor overlap, so that the range set of the two can cover the detection range requirements of a specific muffler.

[0017] (2) The noise reduction detection device for a muffler of this utility model has a folding frame that can be folded relative to itself, thus facilitating the folding and storage of the folding frame. Multiple folding frames are connected end to end by connecting units, which can be bent relative to each other, so that multiple folding frames can be arranged to form a ring array surrounding the muffler to be tested. Sound sensors located in different positions can detect the noise intensity at the corresponding positions, thereby evaluating the muffler's noise reduction effect. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 ;

[0020] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 ;

[0021] Figure 3 This is a schematic diagram of the folding frame in this utility model;

[0022] Figure 4 This is a structural schematic diagram of the connecting unit in this utility model.

[0023] In the diagram, 100 is the array detection component; 110 is the folding frame; 111 is the support frame; 112 is the scissor folding frame; 120 is the detection unit; 121 is the first sound sensor; 122 is the second sound sensor; 130 is the connecting unit; 131 is the chain link; and 140 is the caster wheel.

[0024] 200. Control Center;

[0025] 300. Muffler. Detailed Implementation

[0026] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0027] Please see Figures 1 to 4 This embodiment discloses a noise reduction detection device for a muffler, relating to the field of muffler detection technology. It simultaneously sets up two sound sensors with different ranges, ensuring that the combined range of the two sensors meets the requirements of the entire measurement range. Furthermore, sound sensors are arranged in various directions of the muffler 300 under test to accurately detect noise from the muffler 300 in different directions.

[0028] A noise reduction detection device for a muffler includes an array detection assembly 100. The array detection assembly 100 includes multiple folding frames 110, a detection unit 120, and a bendable connecting unit 130. The detection unit 120 includes a first sound sensor 121 and a second sound sensor 122 for detecting low-range noise and a second sound sensor 122 for detecting high-range noise. The ranges of the first sound sensor 121 and the second sound sensor 122 partially overlap, so that the combined ranges of the two sensors can cover the detection range requirements for a specific muffler 300.

[0029] The first sound sensor 121 and the second sound sensor 122 are respectively connected to the top of the folding frame 110 and can move with the folding frame 110 as a whole. The folding frame 110 can fold relative to itself, thus facilitating the folding and storage of the folding frame 110. Multiple folding frames 110 are connected end to end through a connecting unit 130, which can be bent relative to each other, so that multiple folding frames 110 can be arranged to form a ring array surrounding the silencer 300 under test. Sound sensors located in different positions can detect the noise intensity at corresponding locations, thereby evaluating the noise reduction effect of the silencer 300.

[0030] In use, firstly, multiple folding frames 110 are connected end-to-end through the connecting unit 130 to form a linear structure. Then, by bending the connecting unit 130, the linear structure is arranged to form a ring array surrounding the muffler 300 to be tested. Different first sound sensors 121 and second sound sensors 122 are kept at the same distance from the muffler 300 and located in different orientations, allowing for all-around testing of the muffler 300.

[0031] In some embodiments, the first sound sensor 121 has a range of 10dB to 50dB, which can detect and identify noise with relatively low decibel levels.

[0032] In practical implementation, the range of the first sound sensor 121 refers to the range of noise intensity that the sensor can effectively detect. Specifically, it can be achieved using commercially available conventional low-range sensors, such as electret microphones or piezoelectric sensors. This range covers the low-frequency noise detection requirements, complementing the high-range sensor and avoiding the missed detection of low-intensity noise due to the range limitation of a single sensor.

[0033] During operation, the first sound sensor 121 is configured to acquire noise signals in the range of 10dB to 50dB. This range covers low-intensity noise that may occur during the operation of the silencer 300, such as faint abnormal noises or low-frequency vibration noise during equipment startup. By limiting this range, commercially available and low-cost sensor types can be directly selected, eliminating the need for custom-designed wide-range sensors.

[0034] In some embodiments, the second sound sensor 122 has a range of 40dB to 150dB and can detect and identify noise at relatively high decibel levels.

[0035] In the specific implementation process, the second sound sensor 122 refers to a device for detecting high-range noise. Specifically, it can be implemented using a piezoelectric sensor or a capacitive sensor. Its lower limit is set to 40dB to cover the high-intensity noise commonly found in industrial environments, and its upper limit is set to 150dB to meet the detection requirements under extreme working conditions.

[0036] During use, when the noise generated by the muffler 300 exceeds the maximum detection threshold of the first sound sensor 121, the second sound sensor 122 automatically takes over the detection task, achieving a smooth transition through calibration data of the overlapping range area. During the operation of the muffler 300, the two sensors synchronously collect sound wave signals from different directions through the connection unit 130. The second sound sensor 122 focuses on capturing high-intensity noise sources, such as the high-frequency impact sound of the gas turbine exhaust port or the transient noise when the safety valve is depressurized.

[0037] Traditional detection devices relying on a single sensor require customized wide-range components. This solution, however, achieves wide-range coverage by combining standard-range sensors, avoiding the high cost of customized components and resolving the long delivery cycle of wide-range sensors. Existing dual-sensor systems with non-overlapping ranges suffer from detection blind spots, while this solution eliminates data gaps during range switching by setting overlapping intervals.

[0038] In some embodiments, please refer to Figure 4 The connecting unit 130 includes multiple hinged links 131. The links 131 at both ends are detachably connected to two adjacent folding frames 110 via brackets. The links 131 can be bent freely, allowing the two adjacent folding frames 110 to bend freely as needed, adjusting their relative positions and enabling the array to have bending adjustment capabilities.

[0039] In practical implementation, the chain link 131 is the basic independent component constituting the connecting unit 130. It can be made of metal, and each chain link 131 includes a chain pin, a chain roller, an outer chain plate, and an inner chain plate. Each chain link 131 has a hinge hole on its surface to achieve a rotatable connection. The bracket is a transition component used to fix the chain link 131 and the folding frame 110. It can be implemented using a metal plate with bolt locking grooves. The bracket has interfaces at both ends that match the chain link 131 and the folding frame 110, respectively.

[0040] During assembly, multiple links 131 are hinged to form a bendable continuous structure, with the links 131 at both ends connected to the folding frame 110 via brackets. The hinges between the links 131 allow the connecting units 130 to bend into different curvatures, and the spacing between the folding frame 110s can be synchronously changed by adjusting the rotation angle of the links 131. The detachable connection of the brackets allows the number of folding frame 110s to be increased or decreased according to testing requirements, or to be replaced with folding frame 110s of different sizes. When a ring array needs to be formed, the connecting units 130 formed by the links 131 can bend adaptively, so that the folding frame 110s are evenly distributed to form a closed testing ring.

[0041] Traditional detection devices employ a rigid connection structure of fixed length, making it impossible to adjust the detection array configuration according to the size of the muffler 300. This solution achieves flexible connection through hinged links 131, allowing the spacing of the folding frame 110 to be adjusted and to form any closed shape, adapting to the detection needs of mufflers 300 of different sizes. Simultaneously, the detachable connection structure simplifies the assembly process of the device, avoiding maintenance difficulties caused by welding or riveting.

[0042] As an alternative implementation, the connecting unit 130 includes multiple connecting plates that are hinged to each other. The connecting plates are rotatably connected by pins. The connecting plates at both ends are detachably connected to two adjacent folding frames 110 by brackets. Compared with the link 131, the structure of the connecting plate is simpler and the structure is more stable, which enables the array to have bending and adjustment capabilities.

[0043] In practical implementation, the connecting plate is a rigid component with a planar structure, which can be made of sheet metal. Relative rotation of adjacent components is achieved through hinges. The pin is a cylindrical connector, which can be made of stainless steel. It is inserted into the through hole of the connecting plate to form a rotating pair, allowing the connecting plates to rotate around the pin axis.

[0044] When the folding frame 110 needs to be unfolded, the angle between the connecting plates can be adjusted to the unfolded state, so that the folding frame 110 is connected end to end to form a circular array; when it needs to be stored or transported, the connecting plates can be rotated around the pins to fold and reduce the space occupied. The connecting plates at both ends are connected to the folding frame 110 through brackets. The buckle structure of the brackets allows for quick assembly and disassembly, so that the combination of the folding frame 110 and the connecting unit 130 can be flexibly adjusted to meet the testing needs of silencers 300 of different diameters.

[0045] In some embodiments, please refer to Figure 3The folding frame 110 includes three support frames 111 and multiple scissor-type folding frames 112. The three support frames 111 are vertically arranged and spaced apart from each other. The three support frames 111 are connected by scissor-type folding frames 112. The distance between the three support frames 111 can be adjusted synchronously. The support frames 111 on both sides can move synchronously relative to the middle support frame 111, thereby folding or unfolding the folding frame 110. The folding frame 110 can be folded for storage and unfolded for application as needed.

[0046] In practical implementation, the support frame 111 is a vertically installed rigid support structure, which can be made of metal tubing or composite materials, used to support the detection unit 120 and provide a stable support foundation. The scissor-folding frame 112 is a telescopic structure formed by multiple cross-links hinged together, which can be made of metal or high-strength plastic materials. The distance between the support frames 111 can be adjusted by unfolding or retracting the cross-links. It should be noted that a rotation damper is provided between the scissor-folding frame 112 and the support frame 111. The rotation damper can prevent relative rotation between the scissor-folding frame 112 and the support frame 111, so that the scissor-folding frame 112 and the support frame 111 remain stationary when no external force is applied.

[0047] When an external force is applied to the support frame 111, the scissor-type folding frame 112 simultaneously unfolds or retracts, causing the support frame 111 to expand outward or contract inward. In the unfolded state, the spacing between the support frames 111 increases, forming a ring-shaped detection array surrounding the muffler 300; in the folded state, the spacing between the support frames 111 decreases, facilitating the storage or transportation of the device. This structure achieves overall shape adjustment through mechanical linkage, eliminating the need to individually adjust the position of each support frame 111.

[0048] In some embodiments, please continue reading Figure 3 The tops of the two support frames 111 located on both sides are connected to the first sound sensor 121 and the second sound sensor 122, respectively. The first sound sensor 121 and the second sound sensor 122 are spaced apart during operation to avoid interference. Simultaneously, the first sound sensor 121 and the second sound sensor 122 are staggered relative to each other to prevent interference and collision between the two sensors when the folding frame 110 is folded. The bottoms of the two support frames 111 on both sides are equipped with casters 140, which assist in the movement of the folding frame 110, facilitating its transport and movement.

[0049] In practical implementation, the support frame 111 is a vertical structure used to support the sound sensor. It can be implemented using a rigid frame made of metal or composite materials. Its top is fixedly connected to the sensor by bolts or clips, thereby ensuring the stability of the sensor during the detection process. The caster wheel 140 is a freely steerable moving part. It can be implemented using a roller structure with a locking function. It is connected to the bottom of the support frame 111 through the rotation axis at the bottom of the wheel, allowing the support frame 111 to move flexibly on the ground and be fixed in position.

[0050] The tops of the support frames 111 on both sides are fixedly connected to the first sound sensor 121 and the second sound sensor 122, forming a stable mounting structure for the detection unit 120. The casters 140 mounted at the bottom of the support frames 111 allow the entire detection unit 120 to move in any direction by rolling against the ground. When the detection position needs to be adjusted, the support frames 111 slide to the target area via the casters 140, and then the wheels are fixed by a locking mechanism to prevent displacement during the detection process. The two side support frames 111 and the middle support frame 111 are linked and adjusted via a scissor-type folding frame 112, allowing the circular array to accommodate mufflers 300 of different sizes.

[0051] In some embodiments, please refer to Figure 2 The ring array is a regular polygon, with the muffler 300 located at the center of the regular polygon. Multiple detection units 120 located on the sides of the ring array can maintain the same distance from the muffler 300 and can accurately detect and record noise over a wide range.

[0052] In the specific implementation process, a regular polygon refers to a closed plane figure composed of at least three sides of equal length and equal angles. Specifically, it can be implemented using a regular hexagon, a regular octagon, or a regular dodecagon. The geometric characteristics of equal sides and equal angles ensure the uniformity of the spatial distribution of each detection unit 120 in the array.

[0053] After the folding frame 110 is connected end to end by the connecting unit 130 and unfolded, it can form a regular polygonal ring array. The first sound sensor 121 and the second sound sensor 122 on the top of each folding frame 110 are evenly distributed along the vertices or sides of the regular polygon. Due to the symmetry of the regular polygon, when the silencer 300 to be detected is enclosed, noise signals in all directions can be synchronously collected by the equally distributed sensors, avoiding detection blind spots or data deviations caused by irregular array shape. The hinged structure of the connecting unit 130 allows the folding frame 110 to automatically adjust its angle during unfolding, so that the final ring array conforms to the geometric constraints of the regular polygon.

[0054] In some embodiments, a noise reduction detection device for a muffler further includes a control center 200, which is electrically connected to a plurality of first sound sensors 121 and second sound sensors 122 via wires. The control center 200 is connected to one of the connecting frames and can collect and process signals from the two sound sensors.

[0055] In practical implementation, the control center 200 is a device used to receive and process sensor signals. It can be implemented using an embedded system or a microprocessor, and is used to coordinate the synchronous acquisition of data from multiple sensors and perform noise reduction performance analysis. The wires serve as the connection medium for transmitting electrical signals; they can be implemented using shielded cables or flexible circuit boards to reduce electromagnetic interference during signal transmission. The folding frame 110 supports the array detection assembly 100, fixing the control center 200 and maintaining its stable relative position to the sensor array.

[0056] During the testing process, the control center 200 is integrated into the connecting frame and physically connected to multiple first sound sensors 121 and second sound sensors 122 in the ring array via wires. The control center 200 receives sound pressure signals from sensors in different orientations in real time and performs fusion processing on low-range and high-range data. Because the control center 200 is directly fixed to the connecting frame, its position is adjusted synchronously with the array's unfolding or folding, avoiding signal cable tangling or loosening of interfaces caused by moving the testing device.

[0057] As a further implementation, the control center 200 may have a built-in wireless communication module, such as a Bluetooth or Wi-Fi module, for remotely transmitting processed data to a monitoring terminal. Alternatively, the control center 200 may be equipped with a touchscreen display to directly display the noise distribution map at the detection site.

[0058] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the present utility model.

Claims

1. A noise reduction detection device for a muffler, characterized in that, include: An array detection assembly includes multiple foldable frames, detection units, and bendable connecting units. The detection unit includes a first sound sensor for detecting low-range noise and a second sound sensor for detecting high-range noise, with the range portions of the first and second sound sensors overlapping. The first sound sensor and the second sound sensor are respectively connected to the top of the folding frame; multiple folding frames are connected end to end through the connecting unit, and the multiple folding frames can be arranged to form a ring array for enclosing the silencer to be tested.

2. The noise reduction detection device for a muffler according to claim 1, characterized in that, The range of the first sound sensor is 10dB~50dB.

3. A noise reduction detection device for a muffler according to claim 1 or 2, characterized in that, The range of the second sound sensor is 40dB~150dB.

4. The noise reduction detection device for a muffler according to claim 1, characterized in that, The connecting unit includes multiple hinged links, and the links at both ends are detachably connected to the two adjacent folding frames via brackets.

5. The noise reduction detection device for a muffler according to claim 1, characterized in that, The connecting unit includes multiple hinged connecting plates, which are rotatably connected by pins. The connecting plates at both ends are detachably connected to the two adjacent folding frames by brackets.

6. The noise reduction detection device for a muffler according to claim 1, characterized in that, The folding frame includes three support frames and multiple scissor folding frames. The three support frames are arranged vertically and spaced apart from each other. The three support frames are connected by the scissor folding frames. The distance between the three support frames can be adjusted synchronously to enable the connecting frame to be unfolded or folded.

7. The noise reduction detection device for a muffler according to claim 6, characterized in that, The tops of the two support frames located on both sides are respectively connected to the first sound sensor and the second sound sensor; the bottoms of the two support frames located on both sides are provided with casters.

8. The noise reduction detection device for a muffler according to claim 1, characterized in that, The circular array is a regular polygon.

9. The noise reduction detection device for a muffler according to claim 1, characterized in that, It also includes a control center for acquiring and processing signals, which is electrically connected to a plurality of the first sound sensors and the second sound sensors via wires, and the control center is connected to one of the folding frames.

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