CN114495891A

CN114495891A - Intelligent noise elimination device for power equipment

Info

Publication number: CN114495891A
Application number: CN202210203290.4A
Authority: CN
Inventors: 韦立科; 龚厅厅; 邹李彧奎; 王彦坤
Original assignee: Jiangxi Broad Sci Tech Co ltd
Current assignee: Jiangxi Broad Sci Tech Co ltd
Priority date: 2022-03-03
Filing date: 2022-03-03
Publication date: 2022-05-13
Anticipated expiration: 2042-03-03

Abstract

The invention discloses an intelligent silencer for electric power equipment, wherein a bottom frame is connected with a supporting plate through a rubber seat, the supporting plate is connected with a fixed rod through a groove, the fixed rod is connected with a moving rod in a sliding manner, the outer wall of the moving rod is sleeved with a spring, the top surface of the supporting plate is fixedly connected with a case, the case is connected with a supporting box through a connecting rod, the supporting box is connected with a heat absorbing sheet through the fixed plate, the rear end of the fixed plate is fixedly connected with a fin, the corner of the inner wall of the supporting box is fixedly connected with a first magnet, the periphery of the first magnet is provided with a buffer column, the buffer column is connected with a second magnet through a slide block, the slide block is connected with a fixed box through a slide rod, the outer wall of the fixed box is provided with a through hole, the inner wall of the fixed box is fixedly connected with a sound insulation plate, the center of the inner side wall of the fixed box is fixedly connected with sound wave detector, the rear inner wall of the fixed box is fixedly connected with electric power equipment, and the periphery of the electric motor equipment is provided with a motor, the motor is connected with the appearance of making an uproar, and the sound structure is inhaled to the multilayer, dustproof heat dissipation, multistage shock attenuation.

Description

Intelligent noise elimination device for power equipment

Technical Field

The invention belongs to the technical field of power equipment, and particularly relates to an intelligent noise eliminator for power equipment.

Background

There are many electrical devices in an electrical power system, and they are generally classified into electrical primary devices and electrical secondary devices according to their roles in operation. The equipment in which the primary electric power equipment directly participates in the production, transformation, transmission, distribution and consumption of electric energy is called primary electric power equipment, and mainly comprises: equipment for the production and transformation of electrical energy, such as generators, motors, transformers, etc.; switching devices for switching on and off a circuit, such as current-carrying conductors and gas-insulated devices, for example, circuit breakers, disconnectors, contactors, fuses, etc. Devices for limiting overcurrent or overvoltage, such as buses, power cables, insulators, wall bushings and the like, and devices for current limiting reactors, lightning arresters and other transformers: reducing high voltage and large current in a primary loop for a measuring instrument and a relay protection device, such as a voltage transformer and a current transformer; in order to protect and ensure the normal operation of the primary electrical equipment, the secondary electrical equipment is called secondary electrical equipment, which measures, monitors, controls, adjusts, etc. the operation state of the primary electrical equipment. The device mainly comprises various measuring meters, various relay protection and automatic devices, direct-current power supply equipment and the like.

When power equipment moves, equipment operation itself can produce the noise, too big noise causes the injury to personnel, still some low frequency noise can produce adverse effect to people's mood, need be to its amortization processing, but current effect equipment is too simple, the noise cancelling effect is poor, some power equipment all have heat radiation structure simultaneously, generally adopt direct contact air heat dissipation method, can bring the dust in the air into equipment like this, long-time accumulation can influence the equipment use, and equipment operation can produce and rock, lead to rocking the noise, and external vibrations also can exert an influence to equipment, in order to solve the above-mentioned problem that provides, a power equipment intelligence noise eliminator is provided.

Disclosure of Invention

The invention aims to: in order to solve the problem provided above, an intelligent noise eliminator for electrical equipment is provided.

The technical scheme adopted by the invention is as follows: an intelligent silencer for electric power equipment is characterized in that a rubber seat is fixedly connected to the top surface of a bottom frame, a supporting plate is fixedly connected to the top of the rubber seat, a groove is formed in the side wall of the supporting plate, a fixed rod is fixedly connected to the side wall of the groove, a moving rod is slidably connected to the outer wall of the fixed rod, a spring is sleeved on the outer wall of the moving rod, a limiting block is welded at one end of the moving rod, the front portion of the moving rod is slidably connected to the side wall of the bottom frame, a case is fixedly connected to the top surface of the supporting plate, a fan is fixedly connected to the left side wall of the case, a fan is fixedly connected to the right side wall of the case, a connecting rod is welded at the corner of the inner wall of the case, a supporting case is welded at one end of the connecting rod, a fixed plate is fixedly connected to the outer wall of the supporting case, and a heat absorbing plate is fixedly connected to the front portion of the fixed plate, an inner groove is formed in the fixing plate, a fin is fixedly connected to the rear end of the fixing plate, a first magnet is fixedly connected to the corner of the inner wall of the supporting box, a buffering column fixedly connected to the supporting box is arranged on the periphery of the first magnet, a third magnet is fixedly connected to the top surface of the inner cavity of the buffering column, a sliding block is slidably connected to the inner cavity of the buffering column, a second magnet is fixedly connected to the inner portion of the sliding block, a sliding rod is welded to the top of the sliding block, a fixing box is rotatably connected to the top of the sliding rod, a through hole is formed in the outer wall of the fixing box, a sound insulation plate is fixedly connected to the inner wall of the fixing box, a sound wave detector is fixedly connected to the center of the inner side wall of the fixing box, power equipment is fixedly connected to the inner rear wall of the fixing box, and a motor fixedly connected to the inner rear wall of the fixing box is arranged on the periphery of the power equipment, the motor is connected with a noise reduction instrument through a power output shaft.

In a preferred mode of the invention, the number of the rubber seats is four, and the four rubber seats are respectively arranged at four corners of the bottom surface of the supporting plate.

In a preferred invention, eight groups of mounting structures consisting of the grooves, the fixing rods, the moving rods, the springs and the limiting blocks are arranged, and two groups of mounting structures are arranged on four sides of the supporting plate respectively.

In a preferred mode of the invention, the number of the connecting rods is eight, and two connecting rods are arranged at each of four corners of the support box.

In a preferred invention, eight groups of structures are arranged on the first magnet, the third magnet, the second magnet, the sliding block, the buffer column and the sliding rod, two groups of structures are arranged at four corners of the supporting box respectively, each group of structures corresponds to the connecting rod one by one, the diameter of the outer wall of the sliding block is matched with the diameter of the inner cavity of the buffer column, the positive pole of the first magnet is opposite to the positive pole of the second magnet, and the negative pole of the third magnet is opposite to the negative pole of the second magnet.

In a preferred mode of the invention, the fixing plates are sequentially and equidistantly arranged on the outer side wall of the supporting box, the heat absorbing sheets are vertically arranged on the upper and lower sides of the front part of the fixing plate, the heat absorbing sheets are sequentially and equidistantly arranged on the fixing plates, and the fins are sequentially and equidistantly arranged on the rear side wall of the fixing plate.

In a preferred embodiment of the present invention, the heat absorbing sheet and the fin are both made of copper, and the sound insulating board is made of sound absorbing cotton.

In a preferred invention mode, the through holes are uniformly formed in the outer wall of the fixing box, and the positions of the through holes and the position of the fixing plate are arranged in a staggered manner.

In a preferred mode of the invention, the number of the acoustic wave detectors is four, and the four acoustic wave detectors are respectively arranged in the centers of the left side wall, the right side wall and the upper side wall and the lower side wall of the inner cavity of the fixed box.

In a preferred invention mode, the number of the noise reduction instruments and the number of the motors are four, and the composed structures are respectively arranged at four end corners of the rear side wall of the inner wall of the fixed box.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. according to the invention, a noise source of the electrical equipment is detected through the sound wave detector, the position and the sound wave of the noise source are determined, the motor is controlled to be started through the operation of the control system, the noise reducer is driven to rotate to align with the position of the noise source, the reverse phase sound wave is emitted to the noise source to counteract the noise, the noise can be greatly reduced after the counteracting, and the residual weak noise is absorbed by the sound insulation plate, then is transmitted into the space between the fixing box and the supporting box through the through hole of the fixing box, the sound wave is reflected by the fixing plate and the heat absorption sheet, the noise can be further reduced, the noise control on the electronic equipment can be greatly improved through the three-stage noise reduction structure, the noise cannot be damaged to a human body, and the low-noise production environment can be created.

2. According to the invention, through the through hole on the fixing plate, heat emitted by internal equipment flows into a space between the fixing box and the supporting box through the through hole, then the heat of air is absorbed by the heat absorbing sheet on the fixing plate and is guided into the internal groove in the fixing plate, the internal groove transmits the heat to the fins, then the air inlet fan is started to suck external air into the space between the case and the supporting box, the heat on the fins is taken away, then the fan is started to emit the air with the heat, and the heat dissipation structure is closed, so that the air is not in contact with electronic equipment, the electronic equipment is prevented from falling ash while heat dissipation is ensured, and internal parts are protected.

3. According to the invention, through the sliding rod rotatably connected to the fixed box, when an electronic device runs, the device shakes, the sliding rod drives the sliding block to slide up and down on the buffering column, at the moment, the positive poles of the first magnet and the second magnet are opposite, the negative poles of the second magnet and the third magnet are opposite, repulsion is generated, shaking of the fixed box is buffered, stability of the device is ensured, shaking is prevented from loosening internal line heads and parts, the electronic device is protected, magnetic buffering sound is small, shaking noise is reduced, shaking up and down of the device from the outside is buffered through the rubber pad on the bottom frame, and through the moving rod in sliding connection with the fixed column on the supporting plate, when the device is subjected to shaking force from the outside side, left and right shaking is buffered through the spring on the moving rod, the stability of the whole device is improved through mutual matching use, and the shaking noise of the device caused by external shaking is reduced.

Drawings

FIG. 1 is a schematic front perspective view of the present invention;

FIG. 2 is a schematic perspective view of a fixing rod connection structure according to the present invention;

FIG. 3 is a schematic perspective view of a fixing plate connection structure according to the present invention;

FIG. 4 is a schematic perspective view of a buffer column connection structure according to the present invention;

FIG. 5 is a schematic plan view of the front view of the internal structure of the present invention;

FIG. 6 is an enlarged view taken at A of FIG. 5 in accordance with the present invention;

FIG. 7 is an enlarged view of the invention at B in FIG. 5.

The labels in the figure are: 1-underframe, 2-rubber seat, 3-support plate, 4-groove, 5-fixed rod, 6-movable rod, 7-spring, 8-limited block, 9-cabinet, 10-inlet fan, 11-outlet fan, 12-connecting rod, 13-supporting box, 14-fixed plate, 15-heat absorbing sheet, 16-internal groove, 17-fin, 18-first magnet, 19-buffer column, 20-slide block, 21-second magnet, 22-slide bar, 23-fixed box, 24-through hole, 25-sound insulation plate, 26-sound wave detector, 27-electric equipment, 28-motor, 29-noise reducer and 30-third magnet.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-7, an intelligent noise eliminator for electric power equipment, wherein a rubber seat 2 is fixedly connected to the top surface of a chassis 1, external vibration received by elastic buffering equipment of the rubber seat 2 is utilized, the number of the rubber seats 2 is four, the rubber seats are respectively arranged at four end corners of the bottom surface of a supporting plate 3, the top of the rubber seat 2 is fixedly connected with the supporting plate 3, the side wall of the supporting plate 3 is provided with a groove 4, the side wall of the groove 4 is fixedly connected with a fixed rod 5, the outer wall of the fixed rod 5 is slidably connected with a movable rod 6, the outer wall of the movable rod 6 is sleeved with a spring 7, external shaking force around is buffered by the elasticity of the spring 7, one end of the movable rod 6 is welded with a limiting block 8 for limiting the maximum moving position of the movable rod 6, eight groups of mounting structures are arranged on the groove 4, the fixed rod 5, the movable rod 6, the spring 7 and the limiting block 8, and two groups of mounting structures are respectively arranged on four sides of the supporting plate 3, the front part of the moving rod 6 is connected on the side wall of the chassis 1 in a sliding way, the top surface of the supporting plate 3 is fixedly connected with a case 9, the left side wall of the case 9 is fixedly connected with an air inlet fan 10 for sucking fresh air, the right side wall of the case 9 is fixedly connected with an air outlet fan 11 for exhausting air with heat, the corners of the inner wall of the case 9 are welded with connecting rods 12 for supporting the supporting case 13, one end of each connecting rod 12 is welded with a supporting case 13, the connecting rods 12 are totally eight, the four corners of the supporting cases 13 are respectively provided with two connecting rods 12, the outer wall of the supporting case 13 is fixedly connected with a fixed plate 14, the fixed plates 14 are sequentially arranged on the outer side wall of the supporting case 13 at equal intervals, the front part of the fixed plate 14 is fixedly connected with a heat absorbing sheet 15 for absorbing and guiding the internal heat, the sound wave can be rebounded, and the material of the heat absorbing sheet 15 is copper, the heat absorbing sheets 15 are vertically arranged at the upper side and the lower side of the front part of the fixed plate 14, the heat absorbing sheets 15 are sequentially arranged on the fixed plate 14 at equal intervals, an inner groove 16 is formed in the fixed plate 14 and transmits heat to the fins 17, the fins 17 are fixedly connected to the rear end of the fixed plate 14, the contact area of the heat and air is increased, the fins 17 are made of copper, the fins 17 are sequentially arranged on the rear side wall of the fixed plate 14 at equal intervals, a first magnet 18 is fixedly connected to the corner of the inner wall of the supporting box 13, buffer columns 19 fixedly connected to the supporting box 13 are arranged on the periphery of the first magnet 18, third magnets 30 are fixedly connected to the top surfaces of the inner cavities of the buffer columns 19, sliding blocks 20 are slidably connected to the inner cavities of the buffer columns 19, the diameter of the outer walls of the sliding blocks 20 is matched with the diameter of the inner cavities of the buffer columns 19, second magnets 21 are fixedly connected to the inner parts of the sliding blocks 20, and sliding rods 22 are welded to the tops of the sliding blocks 20, the structure composed of the first magnet 18, the third magnet 30, the second magnet 21, the sliding block 20, the buffer column 19 and the sliding rod 22 is provided with eight groups, four corners of the supporting box 13 are respectively provided with two groups of structures, each group of structures corresponds to the connecting rod 12 one by one, the positive pole of the first magnet 18 is opposite to the positive pole of the second magnet 21, the negative pole of the third magnet 30 is opposite to the negative pole of the second magnet 21, the positive poles of the first magnet 18 and the second magnet 21 are opposite to the negative poles of the second magnet 21 and the third magnet 30, so that the vertical repulsive force to the sliding block 20 is generated, the shaking of the fixed box 23 is buffered, the stability of the equipment is ensured, the top of the sliding rod 22 is rotatably connected with the fixed box 23, the outer wall of the fixed box 23 is provided with a through hole 24, heat and noise are guided into the space between the fixed box 23 and the supporting box 13 through hole 24, the through hole 24 is uniformly arranged on the outer wall of the fixed box 23, and the position of the through hole 24 and the position of the fixed plate 14 are arranged in a staggered way, the inner wall of the fixed box 23 is fixedly connected with a sound insulation board 25 which plays a role in absorbing noise, the heat absorbing sheets 15 and the fins 17 are made of copper, the sound insulation board 25 is made of sound absorbing cotton, the center of the inner side wall of the fixed box 23 is fixedly connected with a sound wave detector 26, the sound wave detector 26 is used for detecting a noise source of the power equipment 27 to determine the position and the sound wave of the noise source, the number of the sound wave detectors 26 is four, the sound wave detectors are respectively arranged at the centers of the left side wall, the right side wall, the upper side wall and the lower side wall of the inner cavity of the fixed box 23, the rear inner wall of the fixed box 23 is fixedly connected with the power equipment 27, the periphery of the power equipment 27 is provided with a motor 28 fixedly connected to the rear inner wall of the fixed box 23, the motor 28 is connected with a noise reducing instrument 29 through a power output shaft, the number of the noise reducing instruments 29 and the motor 28 is four, and the formed structures are respectively arranged at the four end corners of the rear side wall of the inner wall of the fixed box 23, the motor 28 is activated to rotate the noise reducer 29 to a position aligned with the noise source, and to emit an anti-phase sound wave to the noise source to cancel the noise.

The working principle is as follows: in the using process of the intelligent noise eliminator for electric power equipment, when the equipment runs, the equipment runs to generate noise, at the moment, the noise source of the electric power equipment 27 is detected through the four sound wave detectors 26, the position and the sound wave of the noise source are determined, the four motors 28 are independently started through the operation of the control system, the four noise reducers 29 are driven to rotate to align the positions of the noise source, the reverse phase sound waves are transmitted to the noise source to counteract the noise, the noise can be greatly reduced after the noise is counteracted, and the residual weak noise firstly passes through the sound baffle 25 to absorb a part of the noise and then is transmitted into the space between the fixed box 23 and the supporting box 13 through the through holes 24 of the fixed box 23, the sound waves are reflected by utilizing the fixed plate 14 and the heat absorbing sheets 15, the noise can be further reduced, the running noise of the equipment can be effectively reduced, meanwhile, the heat can be generated when the equipment runs, and the through holes 24 on the fixed box 23, the heat emitted by the internal equipment flows into the space between the fixed box 23 and the supporting box 13 through the through hole 24, then the heat of air is absorbed by the heat absorbing sheet 15 on the fixed plate 14 and is guided into the inner groove 16 in the fixed plate 14, the inner groove 16 transfers the heat to the fins 17, then the air inlet fan 10 is started to suck the external air into the space between the case 9 and the supporting box 13 to take away the heat on the fins 17, then the air outlet fan 11 is started to dissipate the air with the heat, and the heat dissipation structure is closed to prevent the air from contacting with the electronic equipment, thereby preventing the electronic equipment from falling ash while ensuring the heat dissipation and protecting the internal parts; meanwhile, when the equipment runs, vibration is generated, at the moment, the slide rod 22 is rotatably connected to the fixed box 23, the slide rod 22 drives the slide block 20 to slide up and down on the buffer column 19, at the moment, the first magnet 18 and the second magnet 21 are opposite in positive pole and the second magnet 21 and the third magnet 30 are opposite in negative pole, so that up-and-down repulsive force to the slide block 20 is generated, the shaking of the fixed box 23 is buffered, the stability of the equipment is ensured, the magnetic buffering sound is small, and the shaking noise is reduced; when equipment receives external vibrations, through the last rubber pad 2 of chassis 1, utilize the elastic buffering of rubber outside to rock from top to bottom of equipment to through the carriage release lever 6 of 5 sliding connection of fixed column on the backup pad 3, when equipment receives outside side and rocks power, utilize spring 7 on the carriage release lever 6 to cushion and rock about, mutually support and use the holistic stability of improve equipment, and reduce the vibration noise that external vibrations lead to equipment.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides an electrical equipment intelligence noise eliminator, includes chassis (1), its characterized in that: the top surface of the chassis (1) is fixedly connected with a rubber seat (2), the top of the rubber seat (2) is fixedly connected with a support plate (3), the side wall of the support plate (3) is provided with a groove (4), the side wall of the groove (4) is fixedly connected with a fixed rod (5), the outer wall of the fixed rod (5) is slidably connected with a movable rod (6), the outer wall of the movable rod (6) is sleeved with a spring (7), one end of the movable rod (6) is welded with a limit block (8), the front part of the movable rod (6) is slidably connected on the side wall of the chassis (1), the top surface of the support plate (3) is fixedly connected with a case (9), the left side wall of the case (9) is fixedly connected with an inlet fan (10), the right side wall of the case (9) is fixedly connected with an outlet fan (11), and the inner wall of the case (9) is welded with a corner of a connecting rod (12), the heat-absorbing and heat-insulating support is characterized in that a support box (13) is welded at one end of the connecting rod (12), a fixing plate (14) is fixedly connected to the outer wall of the support box (13), a heat-absorbing sheet (15) is fixedly connected to the front portion of the fixing plate (14), an inner groove (16) is formed in the fixing plate (14), a fin (17) is fixedly connected to the rear end of the fixing plate (14), a first magnet (18) is fixedly connected to the corner of the inner wall of the support box (13), buffer columns (19) fixedly connected to the support box (13) are arranged on the periphery of the first magnet (18), a third magnet (30) is fixedly connected to the top surfaces of the inner cavities of the buffer columns (19), a sliding block (20) is slidably connected to the inner cavities of the buffer columns (19), a second magnet (21) is fixedly connected to the inside of the sliding block (20), and a sliding rod (22) is welded at the top of the sliding block (20), the top of slide bar (22) is rotated and is connected with fixed case (23), through-hole (24) have been seted up to the outer wall of fixed case (23), inner wall fixedly connected with acoustic celotex board (25) of fixed case (23), inside wall center fixedly connected with acoustic detector (26) of fixed case (23), the back inner wall fixedly connected with power equipment (27) of fixed case (23), be provided with fixed connection all around of power equipment (27) equipment be in motor (28) on the back inner wall of fixed case (23), motor (28) have through power output shaft and fall appearance (29) of making an uproar.

2. The intelligent silencer for electric power equipment of claim 1, wherein: the number of the rubber seats (2) is four, and the rubber seats are respectively arranged at four end corners of the bottom surface of the supporting plate (3).

3. The intelligent silencer for electric power equipment of claim 1, wherein: the mounting structure that recess (4), dead lever (5), carriage release lever (6), spring (7) and stopper (8) are constituteed is provided with eight groups altogether, four sides of backup pad (3) respectively are provided with two sets of mounting structure.

4. The intelligent silencer for electric power equipment of claim 1, wherein: the connecting rods (12) are eight in number, and two connecting rods (12) are arranged at four corners of the supporting box (13).

5. The intelligent silencer for electric power equipment of claim 1, wherein: the structure that first magnet (18), third magnet (30), second magnet (21), slider (20), cushion post (19) and slide bar (22) are constituteed is provided with eight groups altogether, four corners of supporting box (13) respectively are provided with two sets of structures, and each group's structure and connecting rod (12) one-to-one, the outer wall diameter of slider (20) with the inner chamber diameter looks adaptation of cushion post (19), the anodal of first magnet (18) with the anodal of second magnet (21) is relative, the negative pole of third magnet (30) with the negative pole of second magnet (21) is relative.

6. The intelligent silencer for electric power equipment of claim 1, wherein: the fixed plate (14) is arranged on the outer side wall of the supporting box (13) at equal intervals in sequence, the heat absorbing sheets (15) are arranged on the upper side and the lower side of the front portion of the fixed plate (14) in an up-down mode, the heat absorbing sheets (15) are arranged on the fixed plate (14) in a constant interval mode, and the fins (17) are arranged on the rear side wall of the fixed plate (14) in a constant interval mode.

7. The intelligent silencer for electric power equipment of claim 1, wherein: the heat absorbing sheets (15) and the fins (17) are made of copper, and the sound insulation board (25) is made of sound absorption cotton.

8. The intelligent silencer for electric power equipment of claim 1, wherein: the through holes (24) are uniformly formed in the outer wall of the fixed box (23), and the positions of the through holes (24) and the position of the fixed plate (14) are arranged in a staggered mode.

9. The intelligent silencer for electric power equipment of claim 1, wherein: the number of the acoustic detectors (26) is four, and the acoustic detectors are respectively arranged at the centers of the left side wall, the right side wall, the upper side wall and the lower side wall of the inner cavity of the fixed box (23).

10. The intelligent silencer for electric power equipment of claim 1, wherein: the number of the noise reduction instruments (29) and the number of the motors (28) are four, and the formed structures are respectively arranged at four end corners of the rear side wall of the inner wall of the fixed box (23).