CN213574861U

CN213574861U - EC fan whistle box

Info

Publication number: CN213574861U
Application number: CN202022390652.4U
Authority: CN
Inventors: 刘银汉; 简健伟; 王国祥
Original assignee: DONGGUAN JUNKE AIR CONDITIONER MANUFACTURING CO LTD
Current assignee: DONGGUAN JUNKE AIR CONDITIONER MANUFACTURING CO LTD
Priority date: 2020-10-24
Filing date: 2020-10-24
Publication date: 2021-06-29
Anticipated expiration: 2030-10-24

Abstract

The application relates to fan amortization technical field, concretely relates to EC fan whistle box, it includes: the mounting assembly comprises a mounting partition plate for mounting the EC fan, and the middle part of the mounting partition plate is provided with a vent hole for air outlet of the EC fan; the utility model provides a silencer, including the silencer box, the silencer box is both ends open-ended tube-shape, the silencer box includes a plurality of acoustical panels, the acoustical panel is including planking, rock wool board and the inner panel that sets gradually, the silencer box is fixed in the installation baffle, the installation baffle with the silencer box forms the mounting groove that is used for holding the EC fan jointly. This application has the effect that reduces the noise of EC fan.

Description

EC fan whistle box

Technical Field

The application relates to fan amortization technical field, concretely relates to EC fan whistle box.

Background

The EC fan is a centrifugal fan adopting a digital brushless direct current outer rotor motor or a centrifugal fan adopting the EC motor. Most of EC fans used on the market at present adopt a volute-free structure, and the volute-free structure enables an impeller of the EC fan to be directly connected with an EC motor, so that transmission energy consumption is avoided, and the operation cost of transmission loss is saved.

The noise generated by the EC fan is much smaller than that generated by a common fan, but when the EC fan is applied to some air conditioning units with relatively high system resistance, the EC fan generally needs to operate at a high rotating speed, and particularly when a plurality of EC fans are superposed for use, the generated noise is generally higher, a panel of a common air conditioning box only plays a role in sound insulation, and the effect is limited, so that when the EC fan is applied to environments such as office places, medical places or libraries, the generated noise is still obvious to people in the environments.

SUMMERY OF THE UTILITY MODEL

In order to reduce the noise of EC fan, this application provides an EC fan whistle box.

The application provides an EC fan whistle box adopts following technical scheme:

an EC fan sound attenuation box comprises: the mounting assembly comprises a mounting partition plate for mounting the EC fan, and the middle part of the mounting partition plate is provided with a vent hole for air outlet of the EC fan; the utility model provides a silencer, including the silencer box, the silencer box is both ends open-ended tube-shape, the silencer box includes a plurality of acoustical panels, the acoustical panel is including planking, rock wool board and the inner panel that sets gradually, the silencer box is fixed in the installation baffle, the installation baffle with the silencer box forms the mounting groove that is used for holding the EC fan jointly.

By adopting the technical scheme, the cylindrical sound attenuation box body is fixed on the installation partition plate and forms an installation groove for installing the EC fan together with the installation partition plate, the EC fan is fixed on the installation partition plate when being installed, and the air blowing port of the EC fan faces the air vent of the installation partition plate. In the working process of the EC fan, the sound-absorbing plates surrounding the periphery of the EC fan absorb sound waves emitted to the periphery by the EC fan, the rock wool plates in the sound-absorbing plates are used as main sound-absorbing materials, the sound-absorbing effect of the sound waves is better, and meanwhile, the rock wool plates have higher toughness, so that the sound-absorbing box body has a better protection effect on the EC fan.

Preferably, a pair of side that is parallel to each other of planking all is provided with the fixed plate, the rock wool board clamp is located two between the fixed plate, be provided with the fixed strip on the fixed plate, every the fixed strip forms a slot with the fixed plate and the rock wool board that correspond the position jointly, a pair of side that is parallel to each other of inner panel is provided with the cutting respectively, two the cutting with two the slot one-to-one is pegged graft the cooperation.

Through adopting above-mentioned technical scheme, the fixed plate is fixed to be set up in the planking, and the fixed plate passes through the grafting cooperation of slot and cutting with interconnect with the inner panel, in the manufacturing of acoustical panel, at first installs the rock wool board on the planking for the rock wool board receives the stable centre gripping of two fixed plates, then with the inner panel along the one end sliding insertion of fixed plate length under the cooperation of cutting and slot. This kind of production manufacturing approach of acoustical panel is simple and convenient, and the rock wool board produces the compression and possesses and produce the internal stress under the clamping action of planking with the inner panel, and the internal stress of rock wool board makes and produces stable stress between the cell wall of cutting and slot, and then makes the connection status of inner panel and fixed plate stable.

Preferably, the inner plate and the rock wool plate are fixed through gluing, and the outer plate and the rock wool plate are also fixed through gluing.

Through adopting above-mentioned technical scheme, inner panel and rock wool board adhesive fixation, the planking also with rock wool board adhesive fixation, the connection of inner panel and rock wool board and the connection of planking and rock wool board are relatively independent, and the rock wool board can be in more natural soft state, and the internal fiber structure of soft rock wool board is lax more, and its sound wave absorption effect is better, and the rock wool board of soft state has better noise cancelling effect promptly.

Preferably, the sound-absorbing plate is provided with a plurality of sound-absorbing holes.

By adopting the technical scheme, the inner plate is provided with the silencing holes, on one hand, when sound waves emitted by the EC fan are transmitted into the silencing holes, partial sound waves are reflected in the silencing holes and generate interference to be mutually offset, so that the silencing effect of the silencing plate on the EC fan is further improved; on the other hand, the inner plate provided with the silencing hole is lighter in weight and convenient to install and use.

Preferably, the silencing holes are arranged in an array, the ratio of the aperture of each silencing hole to the thickness of the inner plate is 0.5-1, and the ratio of the pitch of the silencing holes to the aperture of the silencing holes is 2-4.

Through adopting above-mentioned technical scheme, the arrangement of bloop array is on the inner panel for the bloop wholly has higher noise cancelling effect, sets up the aperture setting of bloop between 0.5 to 1 and sets up the pitch-row of bloop and the ratio of aperture between 2 to 4 simultaneously, and the holistic noise cancelling effect of bloop in this range value is better.

Preferably, every two adjacent silencing plates are welded and fixed with each other.

Through adopting above-mentioned technical scheme, two adjacent acoustical boards are welded fastening each other, make all acoustical boards integration from this, and the wholeness and the structural stability of sound box body are high, and the noise cancelling effect of sound box body is more stable to when fixed to the sound box body, need not install alone every acoustical board, only need fix in the symmetric position can, simple installation.

Preferably, the installation component still includes the installation sign indicating number, the installation sign indicating number includes first mounting panel and second mounting panel, first mounting panel with the amortization box passes through screw and rivet nut fixed connection, the second mounting panel with the installation baffle also passes through screw and rivet nut fixed connection.

Through adopting above-mentioned technical scheme, the connected mode of screw and rivet nut has firm convenient effect, need not to attack internal thread or welded nut. To thinner first mounting panel, second mounting panel or installation baffle, the connected mode of screw and rivet nut is stable to can easily realize stable connection in narrower space departments such as first mounting panel and second mounting panel contained angle department.

Preferably, a reinforcing plate is fixedly arranged at the included angle between the first mounting plate and the second mounting plate.

Through adopting above-mentioned technical scheme, the reinforcing plate of first mounting panel and second mounting panel contained angle department makes the structural strength of installation sign indicating number higher, and the connection effect of installation sign indicating number to the noise box is more stable, and then makes the noise box more stable to the noise cancelling effect of its EC fan that surrounds.

Preferably, the mounting assembly further comprises a mounting frame, the mounting frame is fixed to the mounting partition plate through screws and rivet nuts, and the four silencing plates are inserted into the mounting frame at the same time.

Through adopting above-mentioned technical scheme, on the mounting bracket was fixed in the installation baffle, four acoustical boards inserted simultaneously and locate the mounting bracket in, four acoustical boards receive the design spacing effect of mounting bracket and the position is stable for four acoustical boards have stable position state, make the wholeness of noise damping box body higher simultaneously, and then make the holistic noise cancelling effect of noise damping box body more stable. In the EC fan is fixed in the mounting groove, when needing to overhaul the EC fan, when needing to dismantle the noise reduction box from the installation baffle promptly, only need with the mounting bracket with the separation of installation baffle can, and need not dismantle the noise reduction board alone, and the same is equitable, overhaul at the EC fan and accomplish the back, the installation of noise reduction box also only need with the mounting bracket be fixed in the installation baffle can, and need not install the noise reduction board alone, this kind of mode makes the wholeness of noise reduction box higher, the dismouting of noise reduction box is more convenient. When the acoustical panel needs to be replaced, the acoustical panel monomer which needs to be replaced is detached from the mounting frame for replacement, and other acoustical panels are not affected.

Preferably, the surface of the mounting frame, which is in contact with the sound-absorbing plate, is provided with an elastic pad.

Through adopting above-mentioned technical scheme, the cushion converts the rigidity butt between installing frame and the planking into the elasticity butt, and then receives further weakening when making the sound wave conduct to the installing frame by the planking, improves holistic noise cancelling effect.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the cylindrical sound-deadening box body is fixed on the mounting partition plate and forms a mounting groove together with the mounting partition plate for mounting the EC fan, the EC fan is mounted in the mounting groove, in the working process of the EC fan, the sound-deadening plates surrounding the periphery of the EC fan absorb sound waves emitted to the periphery by the EC fan, the noise generated by the EC fan is reduced, and meanwhile, the sound-deadening box body has a good protection effect on the EC fan;

2. the inner plate is provided with the silencing holes, on one hand, when sound waves emitted by the EC fan are transmitted into the silencing holes, partial sound waves are reflected in the silencing holes and generate interference to be mutually offset, so that the silencing effect of the silencing plate on the EC fan is further improved; on the other hand, the inner plate provided with the sound attenuation holes is lighter in weight, convenient to mount and less in material consumption in the production of the sound attenuation plate;

3. when the silencing plate is fixed on the installation partition plate through the installation frame, the EC fan is fixed in the installation groove, and in the process of overhauling the EC fan, the installation frame and the installation partition plate are only required to be disassembled and assembled, and the silencing plate is not required to be disassembled and assembled independently, so that the integrity of the silencing box body is higher, and the silencing box body is more convenient to disassemble and assemble; when the acoustical panel needs to be changed, the acoustical panel monomer that will change is pulled down from the mounting bracket and is changed, does not influence other acoustical panels, consequently also is more convenient to the maintenance of acoustical panel self.

Drawings

Fig. 1 is an overall structural view of embodiment 1 of the present application.

Fig. 2 is a structural view of an acoustic panel in embodiment 1 of the present application.

Fig. 3 is a structural view of an acoustic panel in embodiment 2 of the present application.

Fig. 4 is a structural view of an acoustic panel in embodiment 3 of the present application.

Fig. 5 is an overall structural view of embodiment 4 of the present application.

Fig. 6 is an exploded view of the isolation of the cabinet from the mounting frame in embodiment 4 of the present application.

Fig. 7 is an overall structural view of embodiment 5 of the present application.

Fig. 8 is an overall structural view of embodiment 6 of the present application.

Description of reference numerals: 1. mounting the component; 11. installing a partition plate; 12. installing codes; 121. a first mounting plate; 122. a second mounting plate; 123. a reinforcing plate; 13. a mounting frame; 131. fixing the edge plate; 132. a guide edge plate; 133. shaping the edge plate; 2. a sound attenuation box body; 21. a sound-absorbing panel; 211. an inner plate; 2111. cutting; 212. rock wool boards; 213. an outer plate; 2131. a containing groove; 2132. an accommodating cavity; 214. a fixing plate; 2141. a fixing strip; 2142. a slot; 22. a silencing barrel; 221. an inner cylinder; 222. an outer cylinder; 3. and (4) mounting the groove.

Detailed Description

The present application is described in further detail below with reference to figures 1-8.

The application discloses EC fan whistle box.

Example 1

An EC fan sound-deadening box, referring to fig. 1, comprises a sound-deadening box body 2 and a mounting component 1, wherein the sound-deadening box body 2 is in a square cylinder shape with two open ends. The sound-deadening box body 2 comprises four sound-deadening plates 21, and one sound-deadening plate 21 is correspondingly arranged on each side wall of the sound-deadening box body 2. Installation component 1 is including installation baffle 11 and installation sign indicating number 12, and installation sign indicating number 12 is provided with four, and four installation sign indicating numbers 12 correspond with four acoustical panel 21 position one-to-one, and every installation sign indicating number 12 is fixed in installation baffle 11 with the acoustical panel 21 that corresponds, and four acoustical panels 21 form the mounting groove 3 that is used for installing the EC fan with installation baffle 11 jointly. The middle part of the mounting clapboard 11 is provided with a vent hole, and the size of the vent hole is adaptive to the size of an air outlet of the EC fan.

With continued reference to fig. 1, the mounting structure 12 includes a first mounting plate 121 and a second mounting plate 122 which are vertically connected to each other, the first mounting plate 121 is fixedly connected to the acoustical panel 21 at a corresponding position through a screw and a rivet nut, wherein the rivet nut is fixed to the acoustical panel 21 during rivet; the second mounting plate 122 is fixed to the mounting spacer 11 by a screw and a blind rivet nut which is fixed to the surface of the mounting spacer 11 at the time of blind riveting. The fixed reinforcing plate 123 that is provided with in the contained angle department of first mounting panel 121 and second mounting panel 122, reinforcing plate 123 are right triangle-shaped, and two right-angle sides of reinforcing plate 123 are fixed in first mounting panel 121 and second mounting panel 122 respectively.

Referring to fig. 1 and 2, the sound-deadening plate 21 includes an outer plate 213, a rock wool plate 212, and an inner plate 211, which are sequentially disposed from outside to inside, a pair of fixing plates 214 are disposed on a pair of parallel sides of the outer plate 213, and an included angle of 45 degrees is formed between the fixing plates 214 and the outer plate 213. One side of each fixing plate 214, which is away from the outer plate 213, is integrally provided with a fixing strip 2141, the two fixing strips 2141 extend towards the direction of approaching each other, and the two fixing strips 2141 are parallel to the outer plate 213. The inner surface of the outer plate 213 and the inner surfaces of the two fixing plates 214 on both sides thereof enclose a containing groove 2131 for containing the rock wool plate 212, after the rock wool plate 212 is placed in the containing groove 2131, one surface of the rock wool plate 212 is attached to the inner surface of the outer plate 213, and the other surface of the rock wool plate 212, the fixing plates 214 and the inner side surfaces of the fixing strips 2141 form two slots 2142. A pair of mutually parallel side edges of the inner plate 211 are respectively provided with an inserting strip 2111, and the two inserting strips 2111 and the two inserting grooves 2142 are in one-to-one correspondence and are in inserting fit. In this embodiment, the depth of the accommodating groove 2131 needs to be greater than the thickness of the rock wool plate 212, so as to ensure that the rock wool plate 212 can form the slot 2142 after being accommodated in the accommodating groove 2131; in this embodiment, the thickness of the insert 2111 is slightly greater than the thickness of the slot 2142, so that the rock wool board 212 receives a clamping force between the outer plate 213 and the inner plate 211 and the rock wool board 212 generates an internal stress, the internal stress of the rock wool board 212 is transmitted to a contact surface between the insert 2111 and the slot 2142, the insert 2111 is not easily separated from the slot 2142, and the connection between the outer plate 213 and the inner plate 211 is more stable.

In this embodiment, the fixing plate 214 and the outer plate 213 may be integrally formed or may be welded, and when the fixing plate 214 or the outer plate 213 is a thin plate with a small thickness, the difficulty of welding is high, and at this time, the fixing plate 214 and the outer plate 213 are preferably integrally formed.

With continued reference to fig. 2, the sound-deadening plate 21 is provided with a plurality of sound-deadening holes, which are through holes provided in the inner plate 211, and the plurality of sound-deadening holes are arranged in an array. When the sound waves emitted by the EC fan are transmitted into the sound-deadening holes, part of the sound waves are reflected in the sound-deadening holes and interfere with each other to offset each other, so that the sound-deadening effect of the sound-deadening plate 21 on the EC fan is further improved. In this embodiment, the ratio of the aperture of the muffling hole to the thickness of the inner plate 211 is 0.5 to 1, and the ratio of the pitch of the muffling hole to the aperture thereof is 2 to 4, so that the muffling hole has a good muffling effect.

In the present embodiment, the values of the two included angles formed by the two fixing plates 214 and the outer plate 213 can be changed arbitrarily, as long as the two included angles are complementary to each other, so that the four sound-deadening plates 21 can mutually surround and form the sound-deadening box body 2 in a square tube shape.

Example 2

Example 2 differs from example 1 in that: referring to fig. 3, the inner plate 211 and the rock wool plate 212 are fixed by adhesion, and the outer plate 213 and the rock wool plate 212 are also fixed by adhesion, so that the fixing plates 214 do not need to be arranged on both sides of the outer plate 213, and the sound-absorbing plate 21 is simpler in structure and more economical. Compare with the simple mode of passing through planking 213 and inner panel 211 centre gripping of rock wool board 212 among embodiment 1, rock wool board 212 respectively with inner panel 211 and the glued mode of planking 213 for rock wool board 212 can be in more soft state, and the internal fiber structure of more soft rock wool board 212 is lax more, and its sound wave absorption effect is better, and the rock wool board 212 of the soft state has better noise cancelling effect promptly.

Example 3

Example 3 differs from example 1 in that: referring to fig. 4, the inner plate 211 and the fixing plate 214 are fixedly connected to each other by welding, two sides of the inner plate 211 and the two fixing plates 214 are welded and fixed in a one-to-one correspondence manner, and the welding surfaces of the inner plate 211 and the fixing plates 214 are located at the sides of the inner plate 211 and the fixing plates 214 close to each other. The inner plate 211 and the fixing plate 214 are welded and fixed to form a containing cavity 2132, the rock wool plate 212 is filled in the containing cavity 2132, in actual production, the rock wool plate 212 can be filled in the containing cavity 2132 in a forming and then filling mode, and can also be filled in the containing cavity 2132 in a melting and injecting mode in the production process of the sound insulation plate 21. Compared with the way that the inner plate 211 and the fixing plate 214 in the embodiment 1 are fixed, the way that the inner plate 211 and the fixing plate 214 are welded in the embodiment enables the connection of the inner plate 211 and the fixing plate 214 to be more stable, and the connection of the inner plate 211 and the fixing plate 214 does not need the support of the internal stress of the rock wool plate 212. When the rock wool board 212 is filled in the accommodating cavity 2132 in a filling manner, the rock wool board 212 can be in a softer state, and at the moment, the rock wool board 212 has a better silencing effect; when the rock wool board 212 is filled in the accommodating cavity 2132 in a melting manner, the rock wool board 212 respectively generates a bonding force of thermal bonding with the inner board 211, the outer board 213 and the fixing board 214, and at this time, the position state of the rock wool board 212 is more stable, so that the structure of the sound-absorbing board 21 is more stable, and the sound-absorbing effect of the sound-absorbing board 21 is more stable.

Example 4

Example 4 differs from example 1 in that: referring to fig. 5 and 6, the sound-deadening box body 2 is fixed to the mounting partition plate 11 by a mounting bracket 13, and the mounting bracket 13 has a cubic frame structure. The mounting bracket 13 includes four fixed edge plates 131, four guide edge plates 132 and four shaping edge plates 133 in sequence from one side connected to the mounting partition plate 11 to one side far away from the mounting partition plate 11, the fixed edge plates 131 and the guide edge plates 132 are L-shaped plates, and the shaping edge plates 133 are long strip plates. The fixed edge plate 131 is fixed to the installation partition plate 11 through screws and rivet nuts, wherein the rivet nuts are fixed to the surface of the fixed edge plate 131 when in rivet pulling and the surface of the installation partition plate 11 corresponding to the screws is fixed so as to facilitate the detachment of the screws, and further facilitate the detachment and installation of the installation frame 13. The four sound-deadening plates 21 are inserted into the mount frame 13 from the side of the shaping ridge plate 133 of the mount frame 13 along the guide ridge plate 132. Four acoustical boards 21 receive the spacing effect of the design of mounting bracket 13 and the position is stable for four acoustical boards 21 have the stable position state, make the wholeness of sound box body 2 higher simultaneously, and then make the holistic noise cancelling effect of sound box body 2 more stable. In actual installation, the face of mounting bracket 13 in contact with acoustical panel 21 can add the cushion and convert the rigidity butt between mounting bracket 13 and planking 213 into elastic butt with the elasticity, and then receives further weakening when making the sound wave conduct to the installing frame by planking 213, improves holistic noise cancelling effect.

Example 5

Example 5 differs from example 1 in that: referring to fig. 7, the adjacent outer plates 213 are welded and fixed to each other, and the welding surfaces of the adjacent outer plates 213 are located on the sides where the two adjacent outer plates 213 are close to each other. The adjacent outer plates 213 are welded to each other so that the four muffling plates 21 are fixed as an integral structure, and the integrity and the structural stability of the muffling box body 2 are improved, so that the muffling effect of the muffling box body 2 is stable. In this case, only two mounting blocks 12 may be provided to facilitate the mounting and dismounting of the cabinet 2, and the two mounting blocks 12 fix a pair of outer plates 213 parallel to each other to the mounting partition 11.

Example 6

Example 6 differs from example 1 in that: referring to fig. 8, the sound muffling box body 2 is a cylindrical sound muffling box 22, the sound muffling box 22 includes an inner cylinder 221, a rock wool panel 212, and an outer cylinder 222, which are sequentially disposed from inside to outside, the rock wool panel 212 is sandwiched between the outer cylinder 222 and the inner cylinder 221, so that the rock wool panel 212 is also cylindrical, the thickness of the cylindrical rock wool panel 212 in a natural state is greater than the radius difference between the inner cylinder 221 and the outer cylinder 222, that is, the rock wool panel 212 is compressed and has internal stress under the clamping between the inner cylinder 221 and the outer cylinder 222, and the internal stress of the rock wool panel 212 acts on the inner cylinder 221 to stabilize the position state of the inner cylinder 221 relative to the outer cylinder 222. The inner cylinder 221 has a plurality of muffling holes, and the muffling holes of the inner cylinder 221 can be arranged in the manner of the muffling holes in example 1. The silencing pot 22 is fixed to the mounting partition 11 by a plurality of mounting blocks 12, and the plurality of mounting blocks 12 are arranged at equal intervals in the circumferential direction of the outer cylinder 222. The mount 12 includes a first mounting plate 121 and a second mounting plate 122, and unlike embodiment 1, the first mounting plate 121 of the mount 12 is in the shape of a circular arc curved plate to be fitted to the outer cylinder 222, and the second mounting plate 122 of the mount 12 is in the shape of a flat plate. The first mounting plate 121 and the outer cylinder 222 are fixedly connected by screws and blind rivet nuts, and the second mounting plate 122 is fixed to the mounting spacer 11 by screws and blind rivet nuts.

The application of an EC fan whistle box is implemented according to the principle that: the silencing box body 2 is fixed on the installation partition plate 11 and forms an installation groove 3 used for installing the EC fan together with the installation partition plate 11, the EC fan is fixed on the installation partition plate 11 during installation, the EC fan and the installation partition plate 11 can be installed through screws and nuts, and an air outlet of the EC fan faces a ventilation hole of the installation partition plate 11. When the EC fan works, the EC fan blows airflow to the vent holes, and the sound-absorbing plates 21 surrounding the periphery of the EC fan absorb sound waves emitted to the periphery by the EC fan. In the sound-absorbing plate 21, the rock wool plate 212 is used as a main sound-absorbing material, which has a good sound-absorbing effect, and the rock wool plate 212 has high toughness, so that the sound-absorbing box body 2 has a good protection effect on the EC fan.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. An EC fan whistle box, its characterized in that includes:

the mounting assembly (1) comprises a mounting partition plate (11) for mounting the EC fan, and the middle part of the mounting partition plate (11) is provided with a vent hole for exhausting air of the EC fan;

the utility model provides a fan silencer, including noise damping box body (2), noise damping box body (2) are both ends open-ended tube-shape, noise damping box body (2) include a plurality of noise damping boards (21), noise damping board (21) are including planking (213), rock wool board (212) and inner panel (211) that set gradually, noise damping box body (2) are fixed in installation baffle (11), installation baffle (11) with noise damping box body (2) form mounting groove (3) that are used for holding EC fan jointly.

2. The EC fan sound muffling box according to claim 1, wherein: planking (213) a pair of side that is parallel to each other all is provided with fixed plate (214), rock wool board (212) press from both sides and locate two between fixed plate (214), be provided with fixed strip (2141) on fixed plate (214), every fixed strip (2141) and fixed plate (214) and rock wool board (212) of corresponding position form a slot (2142) jointly, a pair of side that is parallel to each other of inner panel (211) is provided with cutting (2111) respectively, two cutting (2111) and two slot (2142) one-to-one and grafting cooperation.

3. The EC fan sound muffling box according to claim 1, wherein: the inner plate (211) and the rock wool plate (212) are fixed through gluing, and the outer plate (213) and the rock wool plate (212) are also fixed through gluing.

4. The EC fan sound muffling box according to claim 1, wherein: the sound-absorbing plate (21) is provided with a plurality of sound-absorbing holes.

5. The EC fan sound muffling box according to claim 4, wherein: the muffling holes are arranged in an array, the ratio of the aperture of the muffling holes to the thickness of the inner plate (211) is 0.5-1, and the ratio of the pitch of the muffling holes to the aperture of the muffling holes is 2-4.

6. The EC fan sound muffling box according to claim 1, wherein: every two adjacent silencing plates (21) are welded and fixed with each other.

7. The EC fan sound muffling box according to claim 1, wherein: the mounting assembly (1) further comprises a mounting code (12), the mounting code (12) comprises a first mounting plate (121) and a second mounting plate (122), the first mounting plate (121) is fixedly connected with the silencing box body (2) through a screw and a rivet nut, and the second mounting plate (122) is fixedly connected with the mounting partition plate (11) through a screw and a rivet nut.

8. The EC fan sound muffling box according to claim 7, wherein: and a reinforcing plate (123) is fixedly arranged at the included angle between the first mounting plate (121) and the second mounting plate (122).

9. The EC fan sound muffling box according to claim 1, wherein: the mounting assembly (1) further comprises a mounting frame (13), the mounting frame (13) is fixed to the mounting partition plate (11) through screws and rivet nuts, and the four silencing plates (21) are inserted into the mounting frame (13) simultaneously.

10. The EC fan sound muffling box according to claim 9, wherein: and an elastic pad is arranged on the surface of the mounting frame (13) contacting with the sound-absorbing plate (21).