KR20200139879A - Noise prevention device installed in air cleaner - Google Patents

Abstract

The present invention relates to an air purifier-embedded noise preventing device, which is installed inside an air purifier having an air suction port and a discharge port and embedded with a filter and a fan to reduce noise generated when an air purifier is operated. The air purifier-embedded noise preventing device of the present invention comprises: an outer sound absorbing body having a duct shape, accommodating a fan therein, and providing a primary sound absorbing area; an inner sound absorbing body mounted inside the outer sound absorbing body together with the fan, and forming a secondary sound absorbing area in a gap from an inner circumferential surface of the outer sound absorbing body; and a fixing frame for fixing the inner sound absorbing body to the outer sound absorbing body. According to the present invention, the cylindrical outer/inner sound absorbing bodies are installed to face each other to doubly absorb noise, thereby having an excellent noise preventing effect. In addition, the primary and secondary sound absorbing areas having different flow cross-sectional areas are positioned inside the outer sound absorbing body such that noise energy flowing through the outer and inner sound absorbing bodies can be effectively attenuated. Furthermore, the sound absorbing area is automatically controlled in proportion to a rotation speed of the fan such that noise does not increase even when the fan is rotated at high speed due to heavy fine dust.

Description

Noise prevention device installed in air cleaner}

The present invention relates to a large air purifier installed in a public place such as a shopping center, an auditorium, or a lobby of a building, and more particularly, effectively controls the noise generated when the air purifier is operated, thereby enabling low-noise operation of the air purifier. It relates to an air purifier built-in noise prevention device.

Pollutants emitted from various manufacturing plants, coal power plants, as well as vehicles on the road, are the main contributors to the atmospheric conditions around us. Particularly, fine dust coming from China through the wind is causing a big problem that has emerged as a recent social issue.

Because fine dust is very small in size, it can penetrate into the body through the skin or respiratory tract and reach terminal cells through blood vessels, which can cause various diseases, including respiratory diseases as well as cancer. Or higher for children. This is why high-performance air purifiers having various purification methods and performances are rapidly spreading in recent years.

The air purifier has a basic structure of a case in which a filter is installed, and a fan installed in the case to intake external polluted air and pass the filter. The most important part of an air purifier is a filter, and the filters include a pretreatment filter, a HEPA filter, and an antibacterial filter.

On the other hand, if the number of residents is largely determined, such as in homes or offices, and the space is not very large, the air purifier can be operated to remove fine dust to some extent, but in the case of outdoor or multi-use facilities, it is bound to be exposed to fine dust as it is. . Accordingly, in recent years, large air purifiers are installed and operated in public facilities such as airports, hospitals, or lobby of shopping centers or buildings (even if it is unavoidable outside).

Large-sized air purifiers have the same principle and structure as general household air purifiers, but they use large and high horsepower motors and fans to cover a large space. During operation, it is bound to generate quite a loud mechanical noise. Accordingly, an air purifier installed in a space where a quiet atmosphere must be maintained, such as a lobby of a museum or a building, must have a noise prevention device that suppresses noise as much as possible.

However, conventional large-sized air purifiers focus only on filtering fine dust and do not have an effective noise treatment capability. In other words, a proper structure that handles the noise generated by the high-power fan is not applied. Therefore, even if a high horsepower motor is installed during manufacturing, there is a limitation in operation in which the speed of the motor cannot be increased sufficiently high during operation.

Domestic Patent Publication No. 10-0566116 (Noise prevention method and device of oxygen generator or oxygen generating air purifier)

The present invention has been created to solve the above problem, and has excellent noise prevention effect because it absorbs noise twice, and since the sound absorption area is automatically adjusted in proportion to the rotation speed of the fan, the noise is increased even if the fan rotates at high speed due to severe fine dust. The purpose of this is to provide an air purifier built-in noise prevention device.

An air purifier built-in noise suppression device of the present invention as a solution to the above object is installed inside an air purifier having an intake port and a discharge port and a filter and a fan built-in to reduce noise generated during operation of the air purifier. An outer sound absorbing body which takes the form of a duct, accommodates the fan therein, and provides a primary sound absorbing zone; An inner sound absorbing body mounted inside the outer sound absorbing body together with the fan and forming a secondary sound absorbing zone between the inner circumferential surface of the outer sound absorbing body; It includes a fixing frame for fixing the inner absorption body to the outer absorption body.

In addition, the air purifier; An intake part having the intake port and a filter and having a fan fixing plate thereon, a fan mounted on the fan fixing plate, a sound-absorbing part vertically fixed to the upper part of the intake part, an exhaust installed at the upper end of the sound-absorbing part and having the discharge port And a portion, wherein the outer sound absorbing body is fixed to the fan fixing plate while accommodating the fan to form a vertical position, and the inner sound absorbing body is positioned vertically above the fan.

In addition, the outer sound absorbing body; An outer support casing having a certain diameter, a vibration damping sheet covering the inner circumferential surface of the outer support casing, a sound absorbing material closely fixed to the inner surface of the vibration damping sheet, a ventilation protective sheet covering and protecting the sound absorbing material, and covering the protective sheet, and a plurality of And an inner perforated casing having a through hole of, in the inner sound absorbing body; An inner support casing of a certain diameter extending vertically, a vibration damping sheet that covers the outer circumferential surface of the inner support casing, a sound absorbing material that is closely fixed to the outer circumferential surface of the vibration damping sheet, a ventilation protective sheet that covers and protects the absorbing material, and the outer circumference of the protective sheet A cylindrical sound absorbing unit having an outer perforated casing covering a plurality of through holes, and mounted on the upper and lower ends of the cylindrical sound absorbing unit, taking the form of a disk having a predetermined diameter and having an upper and lower sound absorbing ability. A sound absorbing part is included.

In addition, the fixing frame; A plurality of arm holders fixed to the upper end of the inner sound absorbing body, a plurality of support arms supported by the arm holder and extending horizontally and spanning the upper end of the outer sound absorbing body, and an outer sound absorbing body located on the outer sound absorbing body It includes a connecting bracket to fix the support arm to the.

In addition, the upper portion of the fixing frame, as to attenuate noise energy by colliding with the upstream flow passing upward through the secondary sound absorbing zone, a horizontal support plate fixed horizontally to the upper portion of the outer sound absorbing body, and a horizontal support plate fixed to the horizontal support plate. An upper sound absorbing body composed of a sound absorbing sheet is further provided.

In addition, the outer sound absorbing body; An outer support casing having a certain diameter, a vibration damping sheet covering the inner circumferential surface of the outer support casing, a sound absorbing material closely fixed to the inner surface of the vibration damping sheet, a ventilation protective sheet covering and protecting the sound absorbing material, and covering the protective sheet, and a plurality of It is provided with an inner perforated casing having a through hole of, the inner sound absorbing body; An inner support casing of a predetermined diameter extending vertically, a vibration damping sheet that covers the outer circumferential surface of the inner support casing, a sound absorbing material that is closely fixed to the outer circumferential surface of the vibration damping sheet, a ventilation protective sheet that covers and protects the absorbing material, and the protective sheet It has an outer perforated casing that covers the outer circumferential surface and has a plurality of through-holes, and has a fixed sound absorbing part fixed to the support arm, and the inner circumferential surface of the inner support casing is interviewed, and it is installed so as to protrude from the bottom of the fixed sound absorbing part through the lifting motion. Consisting of a lift-absorbing unit, the fixed frame includes a sound-absorbing area control means for adjusting the total sound-absorbing area of the inner absorbing body by lifting the lift-absorbing unit in association with a change in the rotational speed of the fan.

In addition, the sound-absorbing area control means; A control unit that controls the driving of the fan, a motor that is driven by receiving a signal from the control unit, a winding roll fixed to the drive shaft of the motor, and a winding roll wound around the winding roll, and the lower end thereof is connected to the lifting sound absorbing unit to operate the motor. It has a wire that lifts and lowers the elevating sound absorbing part.

The air purifier built-in noise suppression device of the present invention as described above is installed so that the cylindrical outer sound absorbing body and the inner sound absorbing body are opposed to each other to absorb noise in duplicate, so that the noise prevention effect is excellent.

In addition, since the first and second sound absorbing zones having different flow cross-sectional areas are located inside the outer sound absorbing body, noise energy flowing through the outer sound absorbing body and the inner sound absorbing body can be effectively attenuated.

In addition, since the sound-absorbing area is automatically adjusted in proportion to the rotational speed of the fan, there is no increase in noise even if the fan rotates at high speed due to severe fine dust.

1 is a view showing the entire structure of an air purifier to which an air purifier built-in noise prevention device according to an embodiment of the present invention is applied.
2 is a partially cut-away perspective view for explaining the structure of an air purifier built-in noise prevention device according to an embodiment of the present invention.
3 is a view for explaining the operation of the noise prevention device shown in FIG.
4 is a view showing a modified example of an air purifier built-in noise prevention device according to an embodiment of the present invention.
5 is a side view showing another modified example of the air purifier built-in noise prevention device according to an embodiment of the present invention.
6 is a perspective view separately showing the fixing frame of FIG. 5.
7 and 8 are views for explaining another example of the air purifier built-in noise prevention device according to an embodiment of the present invention.
9 is a view showing a part of the inner sound absorbing body shown in FIG. 7.

Hereinafter, an embodiment according to the present invention will be described in more detail with reference to the accompanying drawings.

Basically, the noise prevention device of the present invention is installed inside a large air purifier, and has the purpose and structure of reducing noise generated during operation of the air purifier. The large air purifier is equipment installed in a space used by several people, such as a lobby of a hospital or building, a performance hall, a waiting room of an airport or terminal, an auditorium, a museum, a library, and the like.

The basic structure of this noise prevention device is to reduce the noise generated during operation of the air purifier by being installed inside the air purifier, which has an intake port and a discharge port, and includes a filter and a fan, and takes the form of a duct. An outer sound absorbing body accommodating the fan and providing a primary sound absorbing area; An inner sound absorbing body mounted inside the outer sound absorbing body together with the fan and forming a secondary sound absorbing zone between the inner circumferential surface of the outer sound absorbing body; It includes a fixing frame for fixing the inner absorption body to the outer absorption body.

1 is a view showing the entire structure of an air purifier 10 to which an air purifier built-in noise suppression device 30 is applied according to an embodiment of the present invention, and FIG. 2 is for explaining a detailed structure of the noise suppression device. It is a partial cut perspective view. In addition, Figure 3 is a view for explaining the operation of the noise prevention device.

Prior to the full-scale description of the noise suppression device 30 of this embodiment, the structure of the air purifier 10 in which the noise suppression device 30 is incorporated will be first described.

As shown, the air purifier 10 may be divided into an intake part 13, a sound absorbing part 15, and an exhaust part 18.

The intake portion 13 is a portion placed on the ground, and includes an intake port 13b opened to the side and a filter 13a. The type of filter 13a is applied in various ways. Further, a horizontal fan fixing plate 14 is installed on the upper side of the intake part 13. The fan fixing plate 14 is a plate-like member supporting the fan 17 and has a passage (not shown) in the center thereof. The passage allows the air inside the intake part 13 to pass upward when the fan 17 is operated.

The fan 17 is fixed to the upper part of the fan fixing plate 14 and serves to draw up the air in the lower part and discharge it to the sound absorbing part 15. The fan 17 may be a centrifugal fan. The air discharged by the fan 17 has a spiral flow pattern and is discharged to the outside through the space portion 15d after passing through the first sound-absorbing zone 30a and the second sound-absorbing zone 30b to be described later.

The sound-absorbing part 15 is a housing in which the noise preventing device 30 of the present embodiment is incorporated, and has a control unit 15a on its front surface. The control unit is a touch panel input/output unit, and outputs information related to the air purifier 10 and controls the speed of the fan 17.

The exhaust part 18 is provided at the upper end of the sound-absorbing part 15 and has a plurality of discharge ports 15b open in the lateral direction. The air that has moved upward through the sound-absorbing part 15 passes through the space part 15d of the exhaust part 18 and then exits through the discharge port 15b.

On the other hand, the noise prevention device 30 includes an outer sound absorbing body 40, an inner sound absorbing body 50, and a fixed frame 60.

The outer sound absorbing body 40 takes the form of a duct vertically erected on the fan fixing plate 14 and houses the fan 17 therein. A primary sound absorbing zone 30a is formed inside the outer sound absorbing body 40. The primary suction zone 30a is a space in which noise generated by the fan 17 itself or noise caused by air hitting a wall is reduced. The primary sound-absorbing zone 30a is a space composed of a virtual horizontal plane including the inner circumferential surface of the inner perforated casing 45, the fan fixing plate 14, and the lower sound absorbing portion 50c.

The outer sound absorbing body 40 includes an outer support casing 41, a vibration damping sheet 42, a sound absorbing material 43, a protective sheet 44, and an inner perforated casing 45.

The outer support casing 41 is a cylindrical member made of a galvanized steel sheet, has a predetermined diameter and height, and is spaced apart from the inner wall surface of the sound absorbing portion 15. A separate buffer member may be interposed between the inner wall surface and the outer support casing 41.

The vibration damping sheet 42 is a sheet-like member made of rubber and a composite to which an inorganic filler is added, and absorbs vibrations according to the flow pressure of air. As long as it can play such a role, various kinds of vibration suppression sheet 42 can be applied. The vibration suppression sheet 42 completely covers the inner circumferential surface of the outer support casing 41 and its shape takes the shape of a cylinder.

The sound-absorbing material 43 is formed by molding melamine foam having a certain thickness in a cylindrical shape, and is closely fixed to the vibration damping sheet 42. As is known, melamine foam is an eco-friendly material and has excellent sound absorption ability as it has countless voids.

The protective sheet 44 is a breathable sheet that covers and protects the sound-absorbing material 43 entirely or partially. It is to prevent the sound absorbing material 43 from being contaminated by external foreign substances or receiving physical damage. As the protective sheet 44, a glass cross can be used. Glass cross is a sheet-like member made of fiberglass, has excellent heat resistance and does not burn.

The inner perforated casing 45 is manufactured by bending a galvanized steel sheet having a certain thickness, and takes a cylindrical shape and adheres to the protective sheet 44. A plurality of through holes 45a are formed in the inner perforated casing 45. The through hole 45a is a passage through which noise passes. Noise inside the primary sound-absorbing zone 30a reaches the sound-absorbing material 53 through the through hole 45a and is mostly eliminated. The inner perforated casing 45 has the same height as the outer support casing 41, but has a small diameter.

Reference numeral 46 is a finishing ring. The finishing ring 46 is a ring-shaped member bent in an approximate c-shape, and is fitted to the upper and lower ends of the outer sound absorbing body 40, so that the interior material, that is, the vibration damping sheet 42, the sound absorbing material 43, and the protective sheet 44 are removed from the outside. Block.

In addition, four connecting brackets 47 are fixed to the upper closing ring 46. This will be described later.

Meanwhile, the inner sound absorbing body 50 is an element mounted inside the outer sound absorbing body 40 together with the fan 17 as shown in FIG. 1. The inner sound absorbing body 50 as a whole takes the shape of a cylinder and forms a secondary sound absorbing zone 30b between the inner circumferential surface of the outer sound absorbing body 40.

The secondary sound-absorbing zone 30b is a space formed above the primary sound-absorbing zone 30a mentioned above, and provides a reduced flow cross-sectional area compared to the primary sound-absorbing zone 30a, and the primary sound-absorbing zone 30a By compressing the air flowing upward through, so to speak, it serves to insert the noise energy into the outer absorbing body 40 and the inner absorbing body 50. This will be described later.

The inner sound absorbing body 50 is installed on the vertical upper part of the fan 17 through the fixed frame 60, and consists of a cylindrical sound absorbing part 50a, an upper sound absorbing part 50b, and a lower sound absorbing part 50c. . The upper sound absorbing part 50b and the lower sound absorbing part 50c are fitted to the upper and lower ends of the cylindrical sound absorbing part 50a to form an inner space 50d. The upper and lower sound absorbing portions 50b and 50c take the form of a disk having a predetermined diameter and have sound absorbing ability.

The cylindrical sound absorbing part 50a is composed of an inner supporting casing 55, a vibration damping sheet 54, a sound absorbing material 53, a protective sheet 52, and an outer perforated casing 51.

The inner support casing 55 is a member formed of a rounded galvanized steel sheet and takes the shape of a cylinder having a constant diameter extending vertically. The outer perforated casing 51 is also made of galvanized steel and has a plurality of through holes 51a. The through hole 51a is a hole through which noise passes. The outer perforated casing 51 faces the inner perforated casing 45 of the outer sound absorbing body and forms a predetermined distance, and provides the secondary sound absorbing zone 30b.

Closing rings 56 are also mounted at the upper and lower ends of the cylindrical sound absorbing part 50a. The structure and role of the closing ring 56 are the same as those of the closing ring 46 of the outer sound absorbing body 40.

The lower sound absorbing part 50c includes a disk-shaped blocking plate 55b having a predetermined thickness, a vibration damping sheet 54 disposed in order on the bottom of the disk-shaped blocking plate 55b, a sound absorbing material 53, and a protective sheet 52 , It has a laminated structure of the disk-shaped perforated plate 51e. The edge portions of the disk-shaped blocking plate 55b and the disk-shaped perforated plate 51e are in close contact and fixed to the inner circumferential surface of the inner supporting casing 55a.

The above-described interior materials, that is, the vibration damping sheet 54, the sound absorbing material 53, and the protective sheet 52, are given different reference numerals for convenience of description, but are the same as those embedded in the outer sound absorbing body 40.

In addition, the upper sound absorbing part 50b has the same lamination structure as the lower sound absorbing part 50c, but its installation direction is opposite. That is, the disk-shaped perforated plate 51e faces the upper portion, and the disk-shaped blocking plate 55b faces the lower portion.

The fixing frame 60 is to fix the inner suction body 50 to the outer sound absorption body 40, and includes an arm holder 57, a support arm 61, and a connecting bracket 47.

The arm holder 57 is a member that is fixed to the upper end of the inner sound absorbing body 50 and is fixed to the closing ring 56 with the support arm 61 passed through the lower portion thereof. The fixing method of the support arm 61 to the inner sound absorbing body 50 can be variously changed.

The support arm 61 is a square pipe having a crisscross shape, and extends horizontally while being supported by the arm holder 57 and spans the upper end of the outer sound absorbing body 40. The structure of the support arm 61 can be changed in consideration of the load of the inner sound absorbing body 50.

The connecting bracket 47 is installed at the upper end of the outer sound absorbing body 40 and accommodates and fixes the extended end of the support arm 61. If necessary, the support arm 61 may be inserted only into the connecting bracket 47, or may be completely fixed using screws.

Meanwhile, as described above, the secondary sound-absorbing zone 30b has a narrower flow cross-sectional area than the primary sound-absorbing zone 30a. The flow cross-sectional area of the primary sound-absorbing zone 30a is the area of a horizontal circle with diameter D1 shown in FIG. 3, and the flow cross-sectional area of the secondary sound-absorbing zone 30b is the diameter of the flow cross-sectional area of the primary sound-absorbing zone 30a. This is the area minus the area of the circle, which is D2.

Anyway, in the noise prevention device 30 of this embodiment, the noise energy first passes through the first sound-absorbing zone 30a and is first attenuated, and then the residual noise energy is attenuated again in the relatively narrow second sound-absorbing zone 30b. Therefore, the noise prevention effect is good.

This is described again as follows.

First, the noise generated from the fan 17 rises in a spiral by the flow pressure of the air, and the energy is primarily attenuated by colliding with each other in the primary sound-absorbing zone 30a or flowing into the through hole 45a. .

The noise whose energy density is lowered through the above process enters the secondary sound absorbing zone 30b. Since the secondary sound-absorbing zone 30b is narrower than the primary sound-absorbing zone 30a, the noise energy remaining in the introduced air is pushed into the through-holes 45a and 51a on both sides in a more concentrated state and attenuated. Since the pressure in the secondary sound-absorbing zone (30b) is higher than that of the primary sound-absorbing zone (30a), the air (which carries noise energy) inside the secondary sound-absorbing zone (30b) passes through the through-holes (45a, 51a). Of course, you can enter more.

This structural feature is based on the view that the more air is inserted into the through-holes 45a and 51a, the greater the attenuation effect of noise energy, since air plays a role of carrying noise energy.

As described above, the generated noise energy is first removed from the inside of the primary sound-absorbing zone 30a, and the remaining noise energy is removed in the secondary sound-absorbing zone 30b.

4 is a view showing a modified example of an air purifier built-in noise prevention device according to an embodiment of the present invention.

Hereinafter, the same reference numerals as the above-described reference numerals denote the same members having the same function.

Referring to the drawings, it can be seen that the upper sound absorbing body 70 is installed in the space part 15d of the exhaust part 18. The upper sound absorbing body 70 serves to remove residual noise energy by colliding with the upstream flow passing upward through the secondary sound absorbing zone 30b.

The upper sound absorbing body 70 includes a plurality of legs 72 mounted on the fixed frame 60, a horizontal support plate 71 supported on the legs 72, and a sound absorbing sheet 73 mounted on the horizontal support plate 71. Is composed. The sound-absorbing sheet 73 is a glass cloth wrapped with melamine foam, and absorbs and removes the noise remaining in the upstream.

Figure 5 is a side view showing another modified example of the air purifier built-in noise prevention device according to an embodiment of the present invention, Figure 6 is a perspective view showing a separate fixing frame of FIG.

As shown, another type of fixing frame 63 may be applied to the inside of the outer sound absorbing body 40. The fixing frame 60 shown in FIG. 2 is a method in which the inner sound absorbing body 50 is suspended above the fan 17, whereas the fixing frame of FIG. 5 is a method of supporting and supporting the inner sound absorbing body 50.

The fixing frame 63 is composed of a plurality of pillars 63a vertically erected on the top of the fan fixing plate 14 and a support ring 63b horizontally fixed to the upper end of the pillar 63a. The support ring 63b accommodates the lower edge of the inner sound absorbing body 50.

7 and 8 are views for explaining another example of an air purifier built-in noise prevention device according to an embodiment of the present invention, and FIG. 9 is a view showing a part of the inner sound absorbing body 80 shown in FIG. 7 It is a drawing.

The noise prevention device 30 shown in FIGS. 7 to 9 includes the above-described outer sound absorbing body 40, a multistage inner sound absorbing body 80, and a sound absorbing area control means.

As shown in FIG. 7, the inner sound absorbing body 80 has a structure that is pulled upward and folded or spreads downward as shown in FIG. 8. When the inner sound absorbing body 80 is unfolded downward, the sound absorbing area is naturally increased.

The inner sound absorbing body 80 includes a fixed sound absorbing part 50g fixed to the fixed frame 60, a first lifting sound absorbing part 50k installed inside the fixed sound absorbing part 50g, It consists of a second lift-absorbing unit 50m installed in the interior of the first lift-absorbing unit 50k so as to be liftable, and a third lift-absorbing unit 50n mounted inside the second lift-absorbing unit 50m. It goes without saying that, if necessary, the number of applications of the lifting and absorbing units may vary. For example, more than four can be applied, or only one can be applied.

The structure of the fixed sound absorbing part 50g is the same as that of the cylindrical sound absorbing part 50a described with reference to FIG. 2, except that a vertical guide groove 59 is formed in the inner support casing 55a. The guide groove 59 is a groove having a predetermined width and length, and accommodates the lifting block 58 of the first lifting and absorbing part 50k. The lifting block 58 moves up and down in the vertical direction while being inserted into the guide groove 59.

The first lift-absorbing part 50k is in close contact with the inner circumferential surface of the fixed sound-absorbing part 50g and moves up and down through the above-described sound-absorbing area control means. The first lifting and absorbing part 50k has the same internal structure as the fixed sound absorbing part 50g, and has a lifting block 58 on an outer circumferential surface of the upper end thereof, and a guide groove 59 on an inner circumferential surface.

The lifting block 58 guides the lifting movement of the first lifting sound absorbing part 50k while being fitted into the guide groove 59 of the fixed sound absorbing part 50g. In addition, the lifting block 58, as shown in Fig. 7, is located at the top dead center of the guide groove 59 in a state where all the lifting and absorbing parts are raised, and supported at the bottom dead center while the lifting and absorbing parts are lowered as shown in FIG. do. As the lifting block 58 is caught in the guide groove 59, the lifting sound absorbing part does not fall downward.

The second lifting and absorbing part 50m is installed so as to be able to move up and down inside the first lifting and absorbing part 50k, and the third lifting and absorbing part 50n is installed inside the second lifting and absorbing part 50m. The structure of the first, second, and third lifting and absorbing parts (50m) is the same, but the size is different.

The lower sound absorbing part 50c is fixed to the lower end of the third lifting sound absorbing part 50n. The structure of the lower blemishes 50c is as described with reference to FIG. 2.

On the other hand, the sound-absorbing area control means serves to adjust the total sound-absorbing area of the inner sound absorbing body 80 by lifting and lowering the lift-absorbing unit in conjunction with a change in the rotational speed of the fan 17. For example, when the fan 17 is rotated at high speed to increase the noise, the entire sound absorption area is expanded, and when the fan 17 is rotated at low speed, the sound absorption area is reduced.

The sound-absorbing area becomes the minimum when all the lifting and absorbing parts 50k, 50m, and 50n are raised as shown in FIG. 7, and is maximized in the completely descending state as shown in FIG.

The sound-absorbing area control means includes a control unit 15a, a motor 81, a winding roll 82, and a wire 83 for controlling the driving of the fan 17.

The control unit 15a is a touch panel that comprehensively controls the air purifier 10 and, of course, can control the rotational speed of the fan 17.

The motor 81 serves to rotate the winding roll 82 by receiving a signal from the controller 15a. In addition, the winding roll 82 is a member fixed to the drive shaft of the motor, and winds up the wire 83. By rotating the winding roll 82, the wire can be wound up or unrolled.

The wire 83 is a steel wire that is wound on the winding roll 82 and the lower end thereof is connected to the lower sound absorbing part 50c through the connector 84, and as the winding roll 82 is rotated, the lifting sound absorbing part is raised or Make it descend.

The operation of the sound-absorbing area control means is as follows. First, as shown in FIG. 7, when all the lifting and absorbing parts 50k, 50m, and 50n are operated in an elevated state, for example, when the concentration of fine dust increases, the control unit 15a increases the rotational speed of the fan 17. At the same time, the motor 81 is operated to lower the lifting and absorbing part in the direction of the arrow z.

The reason for lowering the lifting/absorption part is to expand the overall sound absorption area since the speed of the fan 17 increases and noise increases. Referring to FIG. 8, it can be seen that the through-holes 51a on the outer circumferential surfaces of the first, second, and third lifting and absorbing parts 50k, 50m, and 50n are all open, so that the sound absorbing ability is maintained to the maximum.

When the air cleanliness is improved, the control unit 15a lowers the rotational speed of the fan 17 and simultaneously pulls up the first, second, and third lift-absorbing units to restore the state as shown in FIG. 7. The reason for raising the first, second, and third lift-absorbing units 50k, 50m, and 50n is to extend the lifespan by minimizing the use time of the first, second, and third lift-absorbing units.

In the end, the noise prevention device 30 of the type shown in FIG. 7 responds appropriately to the noise load, expands the sound absorption area when the noise increases, and reduces the sound absorption area when the noise decreases, and always has a constant noise reduction capability. Can provide.

As described above, the present invention has been described in detail through specific embodiments, but the present invention is not limited to the above embodiments, and various modifications are possible by those of ordinary skill within the scope of the technical idea of the present invention.

10: air purifier 13: intake part 13a: filter
13b: intake port 14: fan fixing plate 15: sound absorption unit
15a: control unit 15b: discharge port 15d: space unit
17: fan 18: exhaust part 30: noise prevention device
30a: 1st sound absorption zone 30b: 2nd sound absorption zone 40: outer sound absorption body
41: outer support casing 42: vibration damping sheet 43: sound absorbing material
44: protective sheet 45: inner perforated casing 45a: through hole
46: closing ring 47: connecting bracket 50: inner absorbing body
50a: cylindrical sound absorbing part 50b: upper sound absorbing part 50c: lower sound absorbing part
50d: internal space 50g: fixed sound absorption unit 50k: first lift sound absorption unit
50m: 2nd lift sound absorption part 50n: 3rd lift sound absorption part 51: outer perforated casing
51a: through hole 51e: disc-shaped perforated plate 52: protective sheet
53: sound absorbing material 54: vibration damping sheet 55a: inner support casing
55b: disk type blocking plate 56: finishing ring 57: arm holder
58: elevating block 59: guide groove 60: fixed frame
61: support arm 63: fixed frame 63a: column
63b: support ring 70: upper sound absorbing body 71: horizontal support plate
72: leg 73: sound absorbing sheet 80: inner sound absorbing body
81: motor 82: winding roll 83: wire
84: connector

Claims (7)

It is installed inside the air purifier, which has an intake port and a discharge port, and has a built-in filter and fan, to reduce noise generated during operation of the air purifier.
An outer sound absorbing body taking the form of a duct, accommodating the fan therein, and providing a primary sound absorbing zone;
An inner sound absorbing body mounted inside the outer sound absorbing body together with the fan and forming a secondary sound absorbing zone between the inner circumferential surface of the outer sound absorbing body;
Air purifier built-in noise prevention device comprising a fixed frame for fixing the inner suction body to the outer sound absorbing body. The method of claim 1,
The air purifier;
An intake part having the intake port and a filter and having a fan fixing plate thereon, a fan mounted on the fan fixing plate, a sound-absorbing part vertically fixed to the upper part of the intake part, an exhaust installed at the upper end of the sound-absorbing part and having the discharge port Includes wealth,
The outer sound absorbing body is fixed to the fan fixing plate in a state in which the fan is accommodated to form a vertical, and the inner sound absorbing body is a built-in air purifier noise suppression device located vertically above the fan. The method of claim 2,
The outer sound absorbing body;
An outer support casing having a certain diameter, a vibration damping sheet covering the inner circumferential surface of the outer support casing, a sound absorbing material closely fixed to the inner surface of the vibration damping sheet, a ventilation protective sheet covering and protecting the sound absorbing material, and covering the protective sheet, and a plurality of And an inner perforated casing having a through hole of,
In the inner sound absorbing body;
An inner support casing of a certain diameter extending vertically, a vibration damping sheet that covers the outer circumferential surface of the inner support casing, a sound absorbing material that is closely fixed to the outer circumferential surface of the vibration damping sheet, a ventilation protective sheet that covers and protects the absorbing material, and the outer circumference of the protective sheet And a cylindrical sound absorbing unit having an outer perforated casing that covers and has a plurality of through holes,
An air purifier built-in noise suppression device that is mounted on the upper and lower ends of the cylindrical sound absorbing part, and includes an upper sound absorbing part and a lower sound absorbing part having a sound absorbing ability and taking the form of a disk having a predetermined diameter. The method of claim 2,
The fixed frame;
A plurality of arm holders fixed to the upper end of the inner sound absorbing body,
A plurality of support arms supported by the arm holder and extending horizontally over the upper end of the outer sound absorbing body;
An air purifier built-in noise suppression device comprising a connecting bracket positioned on the outer sound absorbing body and fixing a support arm to the outer sound absorbing body. The method of claim 2,
In the upper part of the fixed frame, the noise energy is attenuated by colliding with the upstream flow passing upward through the secondary sound-absorbing zone,
An air purifier built-in noise prevention device further provided with an upper sound absorbing body comprising a horizontal support plate fixed horizontally to an upper portion of the outer sound absorbing body and a sound absorbing sheet fixed to the horizontal support plate. The method of claim 4,
The outer sound absorbing body;
An outer support casing having a certain diameter, a vibration damping sheet covering the inner circumferential surface of the outer support casing, a sound absorbing material closely fixed to the inner surface of the vibration damping sheet, a ventilation protective sheet covering and protecting the sound absorbing material, and covering the protective sheet, and a plurality of And an inner perforated casing having a through hole of,
The inner sound absorbing body;
An inner support casing of a predetermined diameter extending vertically, a vibration damping sheet that covers the outer circumferential surface of the inner support casing, a sound absorbing material that is closely fixed to the outer circumferential surface of the vibration damping sheet, a ventilation protective sheet that covers and protects the absorbing material, and the protective sheet A fixed sound-absorbing part that covers the outer circumferential surface and has an outer perforated casing having a plurality of through holes, and is fixed to the support arm,
Consisting of a cylindrical lift-absorbing part installed to be able to appear and retract under the fixed sound-absorbing part through an interview on the inner circumferential surface of the inner support casing,
The fixed frame is equipped with a sound-absorbing area control means for adjusting the total sound-absorbing area of the inner sound-absorbing body by lifting and lowering the lift-absorbing unit in association with a change in the rotation speed of the fan. The method of claim 6,
The sound-absorbing area control means;
A control unit for controlling the driving of the fan,
A motor that is driven by receiving a signal from the control unit,
A winding roll fixed to the drive shaft of the motor,
An air purifier built-in noise suppression device comprising a wire wound around the winding roll and connected to the lift-absorbing part at a lower end thereof to lift the lift-absorbing part when the motor is operated.

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