CN113707417A - Distribution transformer noise reduction device with high barrier rate - Google Patents
Distribution transformer noise reduction device with high barrier rate Download PDFInfo
- Publication number
- CN113707417A CN113707417A CN202110997631.5A CN202110997631A CN113707417A CN 113707417 A CN113707417 A CN 113707417A CN 202110997631 A CN202110997631 A CN 202110997631A CN 113707417 A CN113707417 A CN 113707417A
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- Prior art keywords
- shock absorber
- damping
- transformer
- compression spring
- distribution transformer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/33—Arrangements for noise damping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/022—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using dampers and springs in combination
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/046—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means using combinations of springs of different kinds
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/08—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with rubber springs ; with springs made of rubber and metal
- F16F15/085—Use of both rubber and metal springs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/06—Mounting, supporting or suspending transformers, reactors or choke coils not being of the signal type
Abstract
The invention discloses a distribution transformer noise reduction device with high barrier rate, which comprises two damping cross beams, four primary dampers, two secondary dampers and four-stage dampers, wherein the two damping cross beams are arranged in a bilateral symmetry manner, the bottom of each damping cross beam is supported by the four-stage dampers, the two secondary dampers are symmetrically arranged on each damping cross beam front and back, the four primary dampers are respectively arranged in four ends of a bottom groove of two transformer channel steel, and each secondary damper penetrates through the damping cross beams and the transformer channel steel to be connected to the primary dampers and suspends the transformer channel steel in the air through a screw. The four-stage shock absorber is connected to the shock absorption cross beam through screws. The noise reduction device has the advantages that the noise of the transformer can be greatly reduced after multi-stage damping, the damping and noise reduction effects are better, the noise generated by the vibration of the transformer can be eliminated by more than 98%, the noise pollution is reduced, the normal living state of people is not influenced, the noise reduction device is low in cost, easy to assemble and disassemble, simple to install, simple in modular structure and convenient to carry.
Description
Technical Field
The invention relates to a distribution transformer noise reduction device with high barrier rate, and belongs to the technical field of distribution transformer noise reduction equipment.
Background
With the development of modern construction, noise pollution of a power distribution room becomes a common problem affecting the quality of life of residents, and low-frequency noise generated by a transformer is a main component of the noise of the power distribution room.
The vibration and noise reduction devices mainly used at present comprise three types, namely a spring vibration absorber, a rubber vibration absorber and a gas spring vibration absorber, wherein the spring vibration absorber is an effective product for impact vibration, but has poor vibration effect for the frequency exceeding 10Hz, is basically ineffective for the vibration of medium and high frequency, and is not only ineffective but also a bridge for conducting sound waves (sound bridge) for the vibration (noise) in the hearing range of people; the rubber shock absorber has unsatisfactory vibration isolation and noise reduction effects due to different manufacturing processes and hardness; the vibration isolation, noise reduction and sound insulation effects of the gas spring shock absorber are better than those of the former two in theory, but the gas spring has better low-frequency vibration isolation and noise reduction effects below 35Hz due to the fact that the gas bag forms a resonant cavity, but the effect is not ideal in transformer noise treatment (the noise frequency of a 10kV transformer is 50Hz frequency multiplication, and is in a frequency spectrum region of 100-500 Hz). And the workload of later-period inflation maintenance is large. This is why all current vibration damping products cannot completely control the noise transmission through the structure (solid sound transmission). .
To this we provide a distribution transformer of high separation rate and fall device of making an uproar, low frequency noise that can effectual reduction transformer produced, low cost carries easily, green, and the installation is simple, great saving installation cost.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the utility model provides a distribution transformer of high barrier rate device of making an uproar falls to solve the problem that exists among the above-mentioned prior art.
The technical scheme adopted by the invention is as follows: the utility model provides a distribution transformer of high barrier rate device of making an uproar that falls, including the shock attenuation crossbeam, the one-level bumper shock absorber, second grade bumper shock absorber and level four bumper shock absorbers, the shock attenuation crossbeam adopts two, bilateral symmetry arranges, every shock attenuation crossbeam bottom supports through a plurality of level four bumper shock absorbers, two second grade bumper shock absorbers are installed to the symmetry around every shock attenuation crossbeam is last, the one-level bumper shock absorber adopts four, install respectively in four ends of the bottom groove of two transformer channel-section steels, every second grade bumper shock absorber passes shock attenuation crossbeam and transformer channel-section steel and is connected to the one-level bumper shock absorber and unsettled with the transformer channel-section steel through the screw rod. The four-stage shock absorber is connected to the shock absorption cross beam through screws.
Preferably, the distribution transformer noise reduction device with high barrier rate further comprises a third-level shock absorber, and the third-level shock absorber is installed between the shock absorption cross beam and the second-level shock absorber.
Preferably, the bottom of the four-stage damper is placed in a groove of a channel steel of the damper base, and the channel steel of the damper base is fixed on the ground.
Preferably, above-mentioned shock attenuation crossbeam is square pipe, and the intraductal diapire up end of shock attenuation crossbeam is arranged in to tertiary bumper shock absorber, and the just right shock attenuation crossbeam pipe of tertiary bumper shock absorber goes up the lateral wall and sets up the bar hole, and the second grade bumper shock absorber passes the bar hole and supports and lean on tertiary bumper shock absorber up end.
Preferably, the first-level shock absorber comprises a rubber spring I and a damping bottom plate, the rubber spring I is of a cylindrical structure, a through hole is formed in the middle of the rubber spring I, a first connecting pipe is arranged in the middle of the upper surface of the damping bottom plate, the rubber spring is sleeved on the first connecting pipe, and the upper end of the first connecting pipe is connected with a screw rod.
Preferably, above-mentioned second grade bumper shock absorber includes hard compression spring and flexible compression spring, and hard compression spring cover is outside and keep the clearance at flexible compression spring, and hard compression spring and flexible compression spring upper end are supported and are leaned on there is the baffle, and the baffle setting is in rectangular nut bottom.
Preferably, the lower surface of the baffle is provided with a limit ring, and the hard compression spring and the flexible compression spring are respectively arranged outside and inside the limit ring.
Preferably, the third-level shock absorber comprises a rubber spring II and a pressing plate, the rubber spring II is of a cylindrical structure, a through hole is formed in the middle of the rubber spring II, a connecting pipe II is arranged in the middle of the lower surface of the pressing plate, the rubber spring II is sleeved on the connecting pipe II, the screw rod penetrates through the connecting pipe II and the pressing plate, and a limiting ring II used for limiting the rigid compression spring and the flexible compression spring is arranged on the upper end face of the pressing plate.
Preferably, the four-stage shock absorber adopts a damping sound insulation shock absorber.
Preferably, four ends of the two damping cross beams are symmetrically connected with four L-shaped support frames, and a reinforcing beam is fixedly connected between the two L-shaped support frames which are opposite to each other left and right.
The invention has the beneficial effects that: compared with the prior art, the vibration-damping noise-reduction device has the advantages that the noise of the transformer can be greatly reduced after multi-stage vibration damping, the vibration-damping noise-reduction effect is better, the noise generated by the vibration of the transformer can be eliminated by more than 98%, the noise pollution is reduced, the normal living state of people is not influenced, the noise-reduction device is low in cost, easy to assemble and disassemble, simple to install, convenient to carry and capable of greatly saving the installation cost, and the noise-reduction effect of a frequency-doubled 100-500 Hz frequency spectrum region of a 10kV transformer with the noise frequency of 50Hz is obvious.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic diagram of the right view structure of the present invention;
FIG. 3 is a front view of the present invention;
FIG. 4 is a schematic top view of the present invention;
FIG. 5 is a schematic sectional view A-A of FIG. 3;
FIG. 6 is an enlarged sectional view of the connection of the primary damper, the secondary damper and the tertiary damper.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific embodiments.
Example 1: as shown in fig. 1-6, a distribution transformer noise reduction device with high barrier rate comprises two damping beams 1, a first-stage damper 2, a second-stage damper 3, a third-stage damper 4 and four-stage dampers 5, wherein the two damping beams 1 are arranged symmetrically left and right, the bottom of each damping beam 1 is supported by a plurality of four-stage dampers 5, the bottoms of the four-stage dampers 5 are placed in grooves of damper base channel steel 8, the damper base channel steel 8 is fixed on the ground 9, the damper base channel steel 8 can play a limiting role, two second-stage dampers 3 are symmetrically arranged on each damping beam 1 front and back, the four first-stage dampers 2 are respectively arranged in four ends of a bottom groove of two transformer channel steels 7 (if the existing transformer is transformed, the transformer channel steel 7 cannot be provided with a noise reduction device due to short length, and needs to be lengthened, the bottom is fixedly connected with a longer channel steel), the transformer channel steel 7 is fixedly connected to the front bottom and the rear bottom of the transformer 12, each secondary damper 3 penetrates through the damping beam 1 and the transformer channel steel 7 through a screw 6 to be connected to the primary damper 2 and suspends the transformer channel steel 7, and the four-stage damper 5 is connected to the damping beam 1 through a screw 10; the tertiary damper 4 is installed between the damping beam 1 and the secondary damper 3.
Preferably, above-mentioned shock attenuation crossbeam 1 is square pipe, 1 intraductal diapire up end of shock attenuation crossbeam is arranged in to tertiary bumper shock absorber 4, 1 intraductal lateral wall of shock attenuation crossbeam that tertiary bumper shock absorber 4 is just right sets up bar hole 11, secondary damper 3 passes bar hole 11 and supports and lean on at tertiary bumper shock absorber 4 up end, can let the structure compacter, avoid because of operations such as the too high interference transformer maintenance of secondary damper installation, install in addition inside, the stability of the device of making an uproar is better wholly fallen.
Preferably, above-mentioned one-level bumper shock absorber 2 includes the damper bottom plate 202 of rubber spring 201 and metal preparation, and rubber spring 201 is the cylinder structure, and the middle part is provided with the through-hole, and damper bottom plate 202 upper surface middle part is provided with connecting pipe 203, and rubber spring 201 cup joints on connecting pipe 203, and connecting pipe 203 upper end screwed connection or welding screw 6, through the bottom plate of metal preparation, can transmit the vibration noise stability, and the connection is also convenient for to cooperation connecting pipe.
Preferably, the secondary damper 3 comprises a hard compression spring 301 and a flexible compression spring 302, the hard compression spring 301 is sleeved outside the flexible compression spring 302 and keeps a gap, the upper ends of the hard compression spring 301 and the flexible compression spring 302 are abutted against a baffle 303, the baffle 303 is arranged at the bottom of a long nut 304, the two compression springs are sleeved together, the outer part is hard and the inner part is soft, and the damping and noise reducing effects are better.
Preferably, the lower surface of the baffle 303 is provided with a limit ring 305, the hard compression spring 301 and the flexible compression spring 302 are respectively arranged outside and inside the limit ring 305, and the two springs can be isolated through the limit ring, so that the noise reduction effect is prevented from being deteriorated after the two springs are contacted with each other.
Preferably, the three-stage damper 4 comprises a rubber spring II 401 and a pressing plate 402, the rubber spring II 401 is of a cylindrical structure, a through hole is formed in the middle of the rubber spring II, a connecting pipe II 403 is arranged in the middle of the lower surface of the pressing plate 402, the rubber spring II 401 is sleeved on the connecting pipe II 403, a screw rod 6 penetrates through the connecting pipe II 403 and the pressing plate 402, the pressing plate is made of metal, the vibration noise can be stably transmitted, the connection pipe II is matched to facilitate limiting, the upper end face of the pressing plate 402 is provided with a limiting ring II 404 used for limiting the hard compression spring 301 and the flexible compression spring 302, the limiting ring I can be matched, and the better isolation of the hard compression spring 301 and the flexible compression spring 302 is achieved.
Preferably, the four-stage shock absorber 5 adopts a damping sound-insulation shock absorber, and the damping sound-insulation effect is good.
Preferably, four ends of the two damping crossbeams 1 are symmetrically connected with four L-shaped support frames 13, and a reinforcing beam 14 is fixedly connected between the two L-shaped support frames 13 opposite to each other on the left and right sides, so that the effect of reinforcing the damping crossbeams can be achieved, and the transformer damping base can be conveniently hoisted.
The damping principle is as follows: after the transformer operates and produces the vibration, the vibration transmits the transformer channel-section steel, buffer a part of vibration through the first-level shock absorber of transformer channel-section steel below, then buffer a part of vibration once more through the second grade shock absorber that the screw rod is connected and continue to transmit to tertiary shock absorber, tertiary shock absorber transmits the vibration transmission after buffering for the damping cross arm, the damping cross arm transmits the vibration after dispersing in whole cross arm for the level four shock absorber of a plurality of supports, level four shock absorber transmits the vibration after the damping buffering for shock absorber base channel-section steel, last vibration transmits to ground, after multiple damping, can eliminate more than 98% with the noise that transformer vibration produced, reduce noise pollution, reach and do not influence crowd's normal life state.
The special vibration damping material is filled in the transformer, the outgoing lines of the conventional transformer are all in a hard row connection mode and are another main noise transmission way, and the noise transmission way can be effectively blocked by the soft connection made by the copper braided belts.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and therefore, the scope of the present invention should be determined by the scope of the claims.
Claims (10)
1. The utility model provides a distribution transformer of high barrier rate device of making an uproar that falls which characterized in that: including shock attenuation crossbeam (1), one-level bumper shock absorber (2), second grade bumper shock absorber (3) and level four bumper shock absorber (5), shock attenuation crossbeam (1) adopts two, bilateral symmetry arranges, every shock attenuation crossbeam (1) bottom is supported through a plurality of level four bumper shock absorbers (5), two second grade bumper shock absorbers (3) are installed to the symmetry around every shock attenuation crossbeam (1) is gone up, one-level bumper shock absorber (2) adopt four, install respectively in four ends of the bottom groove of two transformer channel-section steels (7), every second grade bumper shock absorber (3) pass shock attenuation crossbeam (1) and transformer channel-section steel (7) be connected to one-level bumper shock absorber (2) and with transformer channel-section steel (7) unsettled through screw rod (6). The four-stage shock absorber (5) is connected to the shock absorption beam (1) through a screw (10).
2. The noise reducer of a high-barrier-ratio distribution transformer of claim 1, wherein: the shock absorber further comprises a third-level shock absorber (4), and the third-level shock absorber (4) is arranged between the shock absorption cross beam (1) and the second-level shock absorber (3).
3. The noise reducer of a high-barrier-ratio distribution transformer of claim 1, wherein: the bottom of the four-stage shock absorber (5) is placed in a groove of a shock absorber base channel steel (8), and the shock absorber base channel steel (8) is fixed on the ground (9).
4. The noise reducer of high-barrier-ratio distribution transformer of claim 2, wherein: damping crossbeam (1) is square pipe, and the intraductal diapire up end of damping crossbeam (1) is arranged in to tertiary bumper shock absorber (4), and the just lateral wall sets up bar hole (11) on damping crossbeam (1) pipe of tertiary bumper shock absorber (4), and second grade bumper shock absorber (3) pass bar hole (11) and support and lean on at tertiary bumper shock absorber (4) up end.
5. The noise reducer of a high-barrier-ratio distribution transformer of claim 1, wherein: the primary damper (2) comprises a rubber spring I (201) and a damping bottom plate (202), the rubber spring I (201) is of a cylindrical structure, a through hole is formed in the middle of the rubber spring I, a connecting pipe I (203) is arranged in the middle of the upper surface of the damping bottom plate (202), the rubber spring I (201) is sleeved on the connecting pipe I (203), and the upper end of the connecting pipe I (203) is connected with a screw rod (6).
6. The noise reducer of a high-barrier-ratio distribution transformer of claim 1, wherein: two-stage shock absorber (3) are including hard compression spring (301) and flexible compression spring (302), and hard compression spring (301) cover is outside and keep the clearance in flexible compression spring (302), and hard compression spring (301) and flexible compression spring (302) upper end are supported and are leaned on baffle (303), and baffle (303) set up in rectangular nut (304) bottom.
7. The noise reducer of a high-barrier-ratio distribution transformer of claim 1, wherein: the lower surface of the baffle (303) is provided with a limiting ring (305), and the hard compression spring (301) and the flexible compression spring (302) are respectively arranged outside and inside the limiting ring (305).
8. The noise reducer of high-barrier-ratio distribution transformer of claim 2, wherein: the three-level shock absorber (4) comprises a rubber spring II (401) and a pressing plate (402), the rubber spring II (401) is of a cylindrical structure, a through hole is formed in the middle of the rubber spring II, a connecting pipe II (403) is arranged in the middle of the lower surface of the pressing plate (402), the rubber spring II (401) is sleeved on the connecting pipe II (403), a screw rod (6) penetrates through the connecting pipe II (403) and the pressing plate (402), and a limiting ring II (404) used for limiting a hard compression spring (301) and a flexible compression spring (302) is arranged on the upper end face of the pressing plate (402).
9. The noise reducer of a high-barrier-ratio distribution transformer of claim 1, wherein: the four-stage shock absorber (5) adopts a damping sound insulation shock absorber.
10. The noise reducer of a high-barrier-ratio distribution transformer of claim 1, wherein: four ends of the two damping cross beams (1) are symmetrically connected with four L-shaped support frames (13), and a reinforcing beam (14) is fixedly connected between the two L-shaped support frames (13) which are opposite left and right.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110997631.5A CN113707417B (en) | 2021-08-27 | 2021-08-27 | High-barrier-rate noise reduction device for distribution transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110997631.5A CN113707417B (en) | 2021-08-27 | 2021-08-27 | High-barrier-rate noise reduction device for distribution transformer |
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| Publication Number | Publication Date |
|---|---|
| CN113707417A true CN113707417A (en) | 2021-11-26 |
| CN113707417B CN113707417B (en) | 2023-08-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110997631.5A Active CN113707417B (en) | 2021-08-27 | 2021-08-27 | High-barrier-rate noise reduction device for distribution transformer |
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| CN104150102A (en) * | 2014-08-15 | 2014-11-19 | 西安聚能超导磁体科技有限公司 | Vibration damper for long-distance transport of superconducting magnets |
| CN105605148A (en) * | 2016-03-25 | 2016-05-25 | 东北大学 | Damping system for vehicle-mounted CT (computerized tomography) equipment |
| KR101659278B1 (en) * | 2016-07-21 | 2016-09-23 | 제룡전기 주식회사 | Aseismatic molded transfomer |
| CN205881626U (en) * | 2016-07-28 | 2017-01-11 | 国网甘肃省电力公司电力科学研究院 | A vibration/noise reduction platform for station service transformer is joined in marriage in urban area |
| CN205959750U (en) * | 2016-05-09 | 2017-02-15 | 浙江恒朗电气有限公司 | Dry type distribution transformer |
| CN206098085U (en) * | 2017-01-03 | 2017-04-12 | 深圳市港特科技有限公司 | Transformer with structure of making an uproar falls in damping |
| JP6613443B1 (en) * | 2019-03-19 | 2019-12-04 | 黒沢建設株式会社 | Spring-type damping damper |
| CN211145221U (en) * | 2019-11-18 | 2020-07-31 | 长城电器集团上海有限公司 | Shock absorber and dry-type transformer provided with same |
| CN111486133A (en) * | 2020-05-13 | 2020-08-04 | 贾猛虎 | Damping device and low-noise fan |
-
2021
- 2021-08-27 CN CN202110997631.5A patent/CN113707417B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104150102A (en) * | 2014-08-15 | 2014-11-19 | 西安聚能超导磁体科技有限公司 | Vibration damper for long-distance transport of superconducting magnets |
| CN105605148A (en) * | 2016-03-25 | 2016-05-25 | 东北大学 | Damping system for vehicle-mounted CT (computerized tomography) equipment |
| CN205959750U (en) * | 2016-05-09 | 2017-02-15 | 浙江恒朗电气有限公司 | Dry type distribution transformer |
| KR101659278B1 (en) * | 2016-07-21 | 2016-09-23 | 제룡전기 주식회사 | Aseismatic molded transfomer |
| CN205881626U (en) * | 2016-07-28 | 2017-01-11 | 国网甘肃省电力公司电力科学研究院 | A vibration/noise reduction platform for station service transformer is joined in marriage in urban area |
| CN206098085U (en) * | 2017-01-03 | 2017-04-12 | 深圳市港特科技有限公司 | Transformer with structure of making an uproar falls in damping |
| JP6613443B1 (en) * | 2019-03-19 | 2019-12-04 | 黒沢建設株式会社 | Spring-type damping damper |
| CN211145221U (en) * | 2019-11-18 | 2020-07-31 | 长城电器集团上海有限公司 | Shock absorber and dry-type transformer provided with same |
| CN111486133A (en) * | 2020-05-13 | 2020-08-04 | 贾猛虎 | Damping device and low-noise fan |
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| CN113707417B (en) | 2023-08-08 |
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