Variable voltage apparatus quieting test device

Abstract

The utility model discloses a kind of mute experimental device of voltage transformation equipment.The device includes mute laboratory, its inner wall is provided with the sound-absorbing layer of the sound-absorbing layer of three prism sound absorber, bottom is equipped with the floating floor structure including lower shock isolation pad layer and upper installation layer.Mute laboratory is equipped with soundproof door, ground is opened track groove, track is installed by the track of interval composition of rail section and sound attenuation section in slot.Innovatively, in track groove, especially soundproof door bottom section, detachable sound insulation partition is provided, the partition is sealed by the partition groove of its lower surface and track resistance, upper surface and soundproof door sealing cooperation, effectively block the sound leakage through track passage.The utility model passes through composite acoustic structure, vibration isolation system and the unique track sealing design, create the free sound field test environment of extremely low background noise, solve the problem of inaccuracy of measurement in traditional test due to sound leakage, significantly improve the accuracy and reliability of transformer noise test.

Description

Technical Field

[0001] This utility model relates to the field of power equipment testing technology, specifically to a silent experimental device for accurately measuring the noise of power equipment such as transformers. Background Technology

[0002] When a transformer is in operation, it produces a continuous humming sound due to factors such as the magnetostriction of the iron core and the electromagnetic force of the windings. Its noise level is one of the key indicators for measuring product quality and environmental performance, and noise control is especially crucial for transformers installed in sensitive areas such as residential areas, hospitals, and schools.

[0003] Currently, noise testing of transformers is usually conducted in ordinary factory buildings or semi-anechoic chambers, which has the following significant drawbacks:

[0004] Background noise interference: The high background noise in ordinary factory environments can easily drown out the faint noise emitted by the transformer itself, leading to distorted measurement results and making it impossible to accurately assess its true noise level. This is especially difficult to meet the testing requirements of high-standard transformers.

[0005] Severe sound wave reflection: Hard walls, ceilings, and floors can cause multiple reflections of sound waves, forming a reverberant sound field. This leads to an increase in the sound pressure level at the measurement point, which in turn makes the measured value greater than the direct sound of the transformer itself, resulting in inaccurate test data.

[0006] Insufficient structural sound insulation: External vibrations (such as vehicles or nearby equipment operation) are transmitted through the ground to the test platform and transformer body, which can excite structural resonance, generate additional noise, and affect the purity of the test results.

[0007] Sound leakage in test passages: To facilitate transformer transportation, test sites are usually equipped with doors or passages. These passages can become bottlenecks for external sound ingress and internal sound leakage, compromising the integrity of the quiet environment. The traditional solution is to fill the track grooves with temporary materials during testing, which is cumbersome and difficult to guarantee a good seal, making it impossible to achieve a fast and repeatable testing process.

[0008] Therefore, there is an urgent need in this field for a dedicated experimental device that can provide an ultra-low background noise, free sound field environment, and effectively solve the problem of sound leakage in the entrance and exit channels of the test equipment, so as to achieve rapid, accurate and repeatable noise testing. Utility Model Content

[0009] The purpose of this invention is to address the problems mentioned in the background art by proposing a silent testing device for transformer equipment. This device, through the integration of a high-performance sound insulation and absorption structure, a floating floor vibration isolation system, and a unique track and sealing design, creates a near-ideal acoustic testing environment and effectively isolates noise and vibration transmitted through the track grooves, ensuring the accuracy and reliability of transformer noise test data.

[0010] To achieve the aforementioned technical objective, the technical solution adopted by this utility model is as follows:

[0011] A transformer equipment noise reduction test device includes a noise reduction chamber with a sound-absorbing layer on its inner wall. A decibel detector is placed inside the noise reduction chamber. A soundproof door is located on one side of the noise reduction chamber. A track groove is installed on the floor of the noise reduction chamber, passing through the bottom of the soundproof door and connecting the inside and outside of the noise reduction chamber. A track for a transformer equipment transport vehicle to enter and exit is installed in the track groove. The track consists of several rail sections and several sound-absorbing sections connected end to end, with the rail sections and sound-absorbing sections arranged alternately. The sound-absorbing sections are located at the bottom of the soundproof door. A detachable sound-absorbing partition is installed in the track groove, sealingly fitting with the bottom and side wall of the track groove. The lower surface of the sound-absorbing partition has a partition groove that seals against the track. The sound-absorbing partition is installed at the bottom of the soundproof door, and its upper surface abuts against the soundproof door, thus sealing and isolating the inside and outside of the track groove.

[0012] Furthermore, there are several sound-absorbing partitions, which are spaced out along the extension direction of the track groove.

[0013] Furthermore, the walls and ceiling of the soundproof laboratory are constructed from three layers stacked and fixed in sequence. These three layers, from the outside to the inside, are: a cement fiberboard layer, a damping layer, and an inner mounting layer. The cement fiberboard layer is used to isolate external noise from the soundproof laboratory. The damping layer is made of glass wool and is used to absorb and dissipate sound energy. An inner sound-absorbing layer is installed on the inside of the inner mounting layer. The inner sound-absorbing layer consists of several triangular prism sound absorbers distributed throughout the inner mounting layer, with the orientation of adjacent triangular prism sound absorbers perpendicular to each other.

[0014] Furthermore, the material of the triangular prism sound absorber is centrifugal glass wool, which is wrapped with a sound-permeable metal mesh or non-woven fabric.

[0015] Furthermore, a foundation pit is provided on the ground below the silent laboratory. The bottom of the silent laboratory is installed on a bottom sound-absorbing structure, which includes a lower vibration isolation pad and an upper mounting layer. The lower vibration isolation pad is fixed in the foundation pit, and the upper mounting layer is fixed on the lower vibration isolation pad. The upper surface of the upper mounting layer is flush with the ground, and the track groove is opened on the upper mounting layer.

[0016] Furthermore, the inner mounting layer is a perforated gypsum board or a perforated metal plate.

[0017] Furthermore, the upper installation layer is a reinforced concrete structural layer.

[0018] Furthermore, the soundproof door has an internal air gap and an inflatable sealing strip around its perimeter. When the door is closed, the inflatable sealing strip can completely press against the door frame, thus ensuring a tight seal between the soundproof door and the walls of the quiet laboratory.

[0019] Furthermore, auxiliary sensors and cameras are installed inside the silent laboratory. The decibel detector, auxiliary sensors, and cameras are all connected to monitoring equipment located outside the silent laboratory via cables. The auxiliary sensors include temperature sensors and accelerometers.

[0020] Furthermore, there are several decibel detectors, each mounted on a movable tripod, and the camera is mounted on the top of the quiescent chamber. The auxiliary sensor is suspended inside the quiescent chamber by a retractable rope.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] 1. This utility model divides the track into a rail section and a sound-absorbing section. The sound-absorbing section is located in the key area at the bottom of the soundproof door, effectively cutting off the continuous path of solid-borne sound transmission and reducing vibration and noise transmission through the track itself. Simultaneously, this utility model employs a detachable sound-absorbing partition, a core innovation. Like a plug, it tightly seals the track groove during testing. Its lower surface groove fits snugly against the track, while its upper surface abuts against the soundproof door, achieving physical isolation and acoustic sealing of the track groove inside and outside the soundproof room, fundamentally eliminating sound leakage through this channel. Its detachable nature also ensures convenient access for transport vehicles.

[0023] 2. This utility model, through a composite wall / ceiling structure consisting of a cement fiberboard layer, a damping layer, an inner installation layer, and an inner sound-absorbing layer, as well as a floating floor vibration isolation system at the bottom, greatly improves the sound insulation and vibration isolation effect, and creates a highly free sound field. The background noise can be reduced to below 20 decibels, providing a basis for accurate measurement.

[0024] 3. This utility model integrates multiple sensors and cameras, enabling it not only to measure noise but also to simultaneously monitor the transformer's operating temperature and vibration status. Furthermore, the camera allows for observation of the testing process, providing multi-dimensional data support for comprehensive analysis of transformer performance. The movable and pendant design of the sensors allows for flexible placement based on testing standards and the specific conditions of the transformer under test, enabling the acquisition of the most representative data.

[0025] 4. The inner mounting layer of this utility model uses perforated plates, which serve both structural support and auxiliary sound absorption functions; the upper mounting layer uses reinforced concrete, ensuring the structural rigidity and stability of the entire soundproof room and transport track. The soundproof door uses an inflatable sealing strip, achieving an extremely high sealing level when closed. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0027] Figure 2 for Figure 1 AA sectional view.

[0028] Figure 3 for Figure 2 The enlarged view of section B is used to show the relationship between the rail section, the silencing section, and the bottom of the soundproof door.

[0029] Figure 4 This is a schematic diagram of the soundproof partition.

[0030] In the diagram: 1. Silent laboratory; 11. Decibels detector; 12. Cement fiberboard layer; 13. Damping layer; 14. Inner mounting layer; 15. Inner sound absorption layer; 16. Lower vibration isolation pad layer; 17. Upper mounting layer; 18. Auxiliary sensor; 19. Camera; 2. Soundproof door; 3. Track groove; 31. Track; 31a. Rail section; 31b. Noise-absorbing section; 4. Noise-absorbing partition; 41. Partition groove. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0032] Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0033] like Figure 1 and Figure 2As shown, the core of this utility model's transformer equipment silent test device is a silent laboratory 1 constructed inside a factory building. This silent laboratory 1 is an independent acoustic structure, with its bottom installed in a pre-excavated pit through a bottom sound-absorbing structure, forming a "room within a room" vibration isolation system.

[0034] The walls and ceiling of Silent Laboratory 1 utilize a multi-layered composite acoustic structure. For example... Figure 1 and Figure 2 As shown, from the outside to the inside, the layers are: a cement fiberboard layer 12, a damping layer 13, and an inner mounting layer 14. The cement fiberboard layer 12 provides the main sound insulation quality; the damping layer 13 is filled with high-density glass wool to absorb and dissipate sound energy penetrating the outer layer; the inner mounting layer 14, in this embodiment, is preferably perforated gypsum board, which not only serves as the mounting base for the inner sound-absorbing layer 15, but also forms a resonant sound-absorbing structure with the cavity behind it. The inner sound-absorbing layer 15 consists of a large number of closely arranged triangular prism sound absorbers, which are filled with centrifugal glass wool and wrapped with sound-permeable non-woven fabric. Crucially, the edges of adjacent triangular prism sound absorbers are perpendicular to each other (see...). Figure 1-2 The unique arrangement of adjacent wedges (with their different orientations) effectively disperses sound waves incident at different angles, eliminating acoustic standing waves or interference that may be caused by regular arrangement, making the indoor sound field more uniform and free.

[0035] like Figure 1 and Figure 2 As shown, the bottom of the silent laboratory 1 is mounted on a bottom sound-absorbing structure. This structure includes a lower vibration isolation layer 16 and an upper mounting layer 17. The lower vibration isolation layer 16, composed of a high-performance rubber vibration isolation layer, is placed at the bottom of the pit to effectively isolate solid-borne sound from the ground. The upper mounting layer 17 is a cast-in-place reinforced concrete structural layer that provides an extremely stable mounting surface, with its upper part flush with the surrounding workshop floor. The track groove 3 is directly formed in the robust reinforced concrete upper mounting layer 17.

[0036] The key innovation of this invention lies in solving the sound leakage problem in the track channel. (See also...) Figure 2 , Figure 3 and Figure 4 The track 31 for the transformer equipment transport vehicle is not a single piece, but rather consists of several rail sections 31a and several sound-absorbing sections 31b, connected end to end and spaced apart. At least one sound-absorbing section 31b is precisely positioned directly below the soundproof door 2. The sound-absorbing section 31b can be made of high-damping composite material and is structurally designed as a broken bridge, its purpose being to cut off the "sound bridge" that allows sound to propagate continuously along the metal track.

[0037] A sound-absorbing partition 4 is detachably installed within the track groove 3, particularly in the area at the bottom of the soundproof door 2. For example... Figure 4As shown, the soundproof partition 4 is a block that matches the cross-section of the track groove 3, typically made of high-density sound insulation material, such as damping composite sound insulation board. Its lower surface has a partition groove 41 that matches the shape of the track 31. During installation, the soundproof partition 4 is placed in the designated position of the track groove 3, ensuring it fits tightly against the bottom and side walls of the groove. At this point, the upper part of the track 31 is precisely embedded in the partition groove 41, forming a sealed contact. Simultaneously, the upper surface of the soundproof partition 4 is in close contact with the bottom of the soundproof door 2 when closed.

[0038] Its working principle is as follows: After the transformer transport vehicle completes its entry and exit, the soundproof door 2 is closed, and then the sound-absorbing partition 4 is installed. The sound-absorbing partition 4 completely isolates the track groove 3 inside and outside the silent laboratory 1 both physically and acoustically. External noise cannot enter through this gap, and internal sound will not leak, thus ensuring the overall acoustic integrity of the silent laboratory 1. After the test is completed, the sound-absorbing partition 4 can be easily removed, facilitating the transport vehicle's entry and exit again.

[0039] The soundproof door 2 itself is also designed for high acoustic performance. It is a steel soundproof door with an internal air gap and inflatable sealing strips embedded around its perimeter. When the door is closed, the inflatable sealing strips inflate and expand, forming a comprehensive, elastic, and tight seal with the door frame, achieving extremely high sealing and sound insulation.

[0040] like Figure 1 and Figure 2 As shown, the silent laboratory 1 is equipped with a comprehensive monitoring system. Multiple decibel detectors 11 are mounted on movable tripods and can be flexibly arranged at different measuring points around the transformer according to standard requirements. Multiple high-definition cameras 19 are installed in the ceiling for monitoring the testing process. Auxiliary sensors 18, including temperature sensors for monitoring transformer oil temperature or ambient temperature, and accelerometers for measuring transformer casing vibration, are suspended from the ceiling via retractable ropes, allowing for easy adjustment of their contact position with the transformer. All these sensors are connected to a central monitoring device located outside the silent laboratory 1 via pre-embedded through-wall conduits, enabling remote data acquisition, recording, and analysis, thus avoiding interference with the acoustic environment caused by operators remaining indoors.

[0041] The workflow of this utility model is as follows:

[0042] Preparation: Remove the soundproof partition 4 and open the soundproof door 2.

[0043] Component loading: The transformer to be tested is carried by the transformer transport vehicle and enters the silent laboratory 1 through the track groove 3 along the track 31, and is positioned in the test area.

[0044] Sealing: The transport vehicle is removed from the silent laboratory 1, the soundproof door 2 is closed and the inflatable sealing strip is ensured to work, and then the soundproof partition 4 is accurately installed into the track groove 3 at the bottom of the soundproof door 2.

[0045] Deployment: In accordance with the testing specifications, a movable decibel detector 11 and auxiliary sensor 18 were deployed outside the silent laboratory with the assistance of a monitor screen.

[0046] Test: Power on the transformer and simultaneously collect data such as noise, vibration, and temperature through external monitoring equipment.

[0047] Retrieval: After the test is completed, disconnect the power, retrieve the sensor, remove the soundproof partition 4, open the soundproof door 2, drive the transport vehicle in and transport the transformer out.

[0048] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A transformer equipment noise reduction test device, comprising a noise reduction laboratory (1), wherein the inner wall of the noise reduction laboratory (1) is provided with a sound-absorbing layer, a decibel detector (11) is placed inside the noise reduction laboratory (1), a soundproof door (2) is provided on one side of the noise reduction laboratory (1), a track groove (3) is provided on the floor of the noise reduction laboratory (1), the track groove (3) passes through the bottom of the soundproof door (2) and connects the inside and outside of the noise reduction laboratory (1), and a track (31) for a transformer equipment transport vehicle to enter and exit is installed in the track groove (3), characterized in that: The track (31) is composed of several rail sections (31a) and several sound-absorbing sections (31b) connected end to end. The rail sections (31a) and sound-absorbing sections (31b) are arranged at intervals. The sound-absorbing section (31b) is located at the bottom of the soundproof door (2). A sound-absorbing partition (4) is detachably installed in the track groove (3). The sound-absorbing partition (4) is sealed to the bottom and side wall of the track groove (3). The lower surface of the sound-absorbing partition (4) is provided with a partition groove (41). The partition groove (41) is sealed against the track (31). The sound-absorbing partition (4) is installed at the bottom of the soundproof door (2). The upper surface of the sound-absorbing partition (4) is in contact with the soundproof door (2), thereby sealing and isolating the inside and outside of the track groove (3).

2. The transformer equipment noise reduction test device according to claim 1, characterized in that: The number of the sound-absorbing partitions (4) is several, and they are arranged at intervals along the extension direction of the track groove (3).

3. The transformer equipment noise reduction test device according to claim 1, characterized in that: The walls and top of the silent laboratory (1) are made of three layers stacked and fixed in sequence. The three layers are: cement fiberboard layer (12), damping layer (13) and inner mounting layer (14) from the outside to the inside. The cement fiberboard layer (12) is used to isolate external noise from the silent laboratory (1). The damping layer (13) is made of glass wool and is used to absorb and dissipate sound energy. An inner sound-absorbing layer (15) is installed on the inside of the inner mounting layer (14). The inner sound-absorbing layer (15) consists of several triangular prism sound absorbers distributed throughout the inner mounting layer (14). The orientation of adjacent triangular prism sound absorbers is perpendicular to each other.

4. The transformer equipment noise reduction test device according to claim 3, characterized in that: The material of the triangular prism sound absorber is centrifugal glass wool, which is wrapped with a sound-permeable metal mesh or non-woven fabric.

5. The transformer equipment noise reduction test device according to claim 3, characterized in that: The ground below the silent laboratory (1) is provided with a foundation pit. The bottom of the silent laboratory (1) is installed on a bottom sound-absorbing structure. The bottom sound-absorbing structure includes a lower vibration isolation pad (16) and an upper mounting layer (17). The lower vibration isolation pad (16) is placed in the foundation pit and fixed. The upper mounting layer (17) is fixed on the lower vibration isolation pad (16). The upper surface of the upper mounting layer (17) is flush with the ground. The track groove (3) is opened on the upper mounting layer (17).

6. The transformer equipment noise reduction test device according to claim 3, characterized in that: The inner mounting layer (14) is a perforated gypsum board or a perforated metal plate.

7. The transformer equipment noise reduction test device according to claim 5, characterized in that: The upper mounting layer (17) is a reinforced concrete structural layer.

8. The transformer equipment noise reduction test device according to claim 1, characterized in that: The soundproof door (2) is a door with an internal air gap and an inflatable sealing strip around the door. After the door is closed, the inflatable sealing strip can completely press the door frame, thereby making the soundproof door (2) and the wall of the silent laboratory (1) seal together.

9. The transformer equipment noise reduction test device according to claim 1, characterized in that: The quiet laboratory (1) is equipped with an auxiliary sensor (18) and a camera (19). The decibel detector (11), the auxiliary sensor (18) and the camera (19) are all connected to a monitoring device located outside the quiet laboratory (1) via cables. The auxiliary sensor (18) includes a temperature sensor and an accelerometer.

10. The transformer equipment noise reduction test device according to claim 9, characterized in that: The number of decibel detectors (11) is several, each of which is mounted on a movable support. The camera (19) is mounted on the top of the silent laboratory (1), and the auxiliary sensor (18) is suspended inside the silent laboratory (1) by a retractable rope.

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