Noise reduction device and range hood applying same

Abstract

The utility model discloses a noise reduction device and a range hood applying the noise reduction device, the noise reduction device comprises a sound absorption cover (1), the interior of the sound absorption cover (1) is hollow, the sound absorption cover (1) is provided with an opening, and the sound absorption cover (1) is provided with a noise reduction hole (11); the base (2) is arranged at the opening, and a noise reduction cavity (70) is defined by the base (2) and the sound absorption cover (1); the sound absorption part is arranged in the noise reduction cavity (70); the noise reduction device further comprises a movable assembly (200), the movable assembly (200) is provided with a noise reduction through hole (31), and at least part of the movable assembly (200) is restrained in the noise reduction cavity (70) in the mode that the movable assembly (200) can move relative to the sound absorption cover (1). The movable assembly (200) is located upstream of the sound absorbing piece in the direction in which noise enters the sound absorbing cover (1). The noise reduction device can be suitable for different noise frequency bands, and the movable assembly can be adjusted to different positions according to needs.

Description

Technical Field

[0001] The utility model relates to the technical field of noise reduction, in particular to a noise reduction device and a range hood applied with the noise reduction device. Background Art

[0002] The range hood sucks and discharges oil fume through a centrifugal fan installed inside the range hood. During the operation of the fan, noise will be generated, affecting the user experience. To reduce noise, a noise reduction device is often set. With the continuous progress of range hood technology and the continuous improvement of the air volume parameters of range hoods, new requirements are put forward for the noise reduction technology of range hoods. At present, the range hoods basically set a sound absorption box outside the fan and install sound absorption cotton inside the sound absorption box for physical noise reduction. For example, the "Range Hood" disclosed in the Chinese utility model patent with the authorization number CN212961772U.

[0003] However, there are the following problems:

[0004] First, the noise generated during the operation of the fan has different frequency bands. The sound absorption cotton installed in the conventional sound absorption box can only absorb the noise of a fixed frequency band, and different series of range hood products have different frequency bands of generated noise due to different internal structures. Therefore, the applicable range of the conventional sound absorption box for noise frequency bands is relatively narrow;

[0005] Second, as a sound absorption material, the sound absorption cotton will absorb oil as the use frequency of the range hood increases, resulting in a decrease in sound absorption performance and causing the sound absorption cotton to fail. Summary of the Utility Model

[0006] The first technical problem to be solved by the utility model is to provide a noise reduction device that can be applicable to different noise frequency bands according to the current situation of the prior art.

[0007] The second technical problem to be solved by the utility model is to provide a noise reduction device that can improve the service life of the sound absorption member.

[0008] The third technical problem to be solved by the utility model is to provide a range hood applied with the noise reduction device.

[0009] The technical solution adopted by the utility model to solve the above first technical problem is: a noise reduction device, including

[0010] a sound absorption cover, which is hollow inside and has an opening, and the sound absorption cover has noise reduction holes;

[0011] a base, which is arranged at the opening and encloses a noise reduction cavity with the sound absorption cover;

[0012] a sound absorption member, which is arranged in the noise reduction cavity;

[0013] Characterized in that: the noise reduction device further includes

[0014] A movable component, having noise reduction through-holes, and at least partially constrained in a noise reduction cavity in a manner capable of moving relative to a sound absorption cover;

[0015] Along the direction in which noise enters the sound absorption cover, the movable component is located upstream of the sound absorption member.

[0016] The structure of the movable component is specifically that, for the convenience of manufacturing, the movable component includes

[0017] A mounting plate, having perforations or grooves;

[0018] A movable plate, having noise reduction through-holes, the movable plate being constrained on the mounting plate and movably passing through the perforations or grooves;

[0019] A first driving member, for driving the movable plate in and out of the perforations or grooves, so as to adjust the overlapping area between the movable plate and the sound absorption cover.

[0020] The connection structure between the first driving member and the movable plate is specifically that the base has a toothed ring;

[0021] There is also provided in the noise reduction cavity:

[0022] A gear, meshing with the inner wall of the toothed ring;

[0023] A fixing rod, with both ends respectively fixed to the rotating shaft part of the gear and the movable plate;

[0024] The first driving member is drivingly connected to the input end of the gear, and drives the gear to rotate along the toothed ring, thereby driving the movable plate in and out of the perforations or grooves.

[0025] To further solve the second technical problem of the present application, preferably, the noise reduction device includes

[0026] A second driving member, provided in the noise reduction cavity, and drivingly connected to the mounting plate, to drive the movable component to approach or move away from the sound absorption cover along the direction in which noise enters the sound absorption cover.

[0027] When the sound absorption member, such as sound absorption cotton, absorbs oil, its volume will expand. The movable component moves away from the sound absorption cover and can squeeze the sound absorption member, facilitating the discharge of oil from the sound absorption member, achieving a certain self-cleaning effect, thereby increasing the service life of the sound absorption member; at the same time, by moving the movable component closer to or away from the sound absorption cover, the distance between the movable plate and the sound absorption cover can be adjusted, thereby adjusting the applicable range of the noise reduction device.

[0028] The connection structure between the second driving member and the movable component is specifically that there is provided in the noise reduction cavity:

[0029] A mounting post, having an open cavity, a side wall opening communicating with the cavity, and the mounting post is for installing the second driving member;

[0030] A crank, one end of which is drivingly connected to the output end of the second driving member;

[0031] A connecting rod, one end of which is rotatably connected to the other end of the crank;

[0032] A slider, which is rotatably connected to the other end of the connecting rod and passes through the side wall opening of the mounting post;

[0033] An elastic member, which is arranged in the cavity of the mounting post and is in a compressed energy storage state under the action of the slider, and the elastic member has a tendency to release energy to reset the slider;

[0034] A limiting post, which is arranged on the mounting post in a manner that can move axially relative to the mounting post and is relatively fixed to the mounting post in the circumferential direction;

[0035] A connecting plate, which is located between the mounting plate and the slider, is connected to the mounting plate and the slider, and the connecting plate is connected to the limiting post.

[0036] After the noise reduction device is used for a period of time, the sound absorption cover will be attached with oil stains. In order to remove the oil stains on the inner wall of the sound absorption cover, the noise reduction device further includes

[0037] A third driving member, which is arranged in the noise reduction cavity and is drivingly connected to the mounting plate, so as to drive the mounting plate in a state of being attached to the inner wall of the sound absorption cover to move along the inner wall of the sound absorption cover. In this way, the mounting plate moves along the inner wall of the sound absorption cover to scrape the oil stains on the inner wall of the sound absorption cover and prevent the noise reduction holes from being blocked.

[0038] In order to improve the noise reduction effect, the sound absorption cover is hemispherical;

[0039] The mounting plate and the movable plate are arc-shaped, and the bending direction of the arc is the same as the bending direction of the sound absorption cover.

[0040] In this way, the area of the sound absorption cover is large, which is beneficial to fully interact with the noise. In addition, the hemispherical shape and the arc shape increase the frequency of noise reflection, thereby improving the noise reduction effect.

[0041] In order to further reduce noise, the size of the noise reduction through holes of the movable plate is smaller than the size of the noise reduction holes of the sound absorption cover. In this way, it is beneficial to absorb noise at the movable plate, thereby further reducing noise.

[0042] In order to facilitate the discharge of oil stains from the sound absorption member, the sound absorption cover is provided with an oil drain port communicated with the noise reduction cavity at a position adjacent to the base.

[0043] The technical solution adopted by the present utility model to solve the above-mentioned third technical problem is: an oil fume extractor, characterized in that it includes the noise reduction device as described above.

[0044] Compared with the prior art, the advantages of the present utility model are as follows: By providing a movable component, the movable component is in different positions relative to the sound-absorbing cover. Part of the noise entering the sound-absorbing cover is absorbed by the sound-absorbing member, and the other part is dissipated after being absorbed by the movable component, reflected by the movable component, reflected by the inner wall of the sound-absorbing cover, and acting through the gap between the movable component and the inner wall of the sound-absorbing cover, or is continuously absorbed by the sound-absorbing member. In this way, the noise reduction device can be applied to different noise frequency bands, and according to needs, the movable component can be adjusted to different positions. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 FIG. is a schematic diagram of the noise reduction device according to an embodiment of the present utility model;

[0046] Figure 2 FIG. is a sectional view of an embodiment of the present utility model;

[0047] Figure 3 is Figure 2 a schematic diagram after removing the sound-absorbing cover;

[0048] Figure 4 is Figure 3 a schematic diagram of another state (the movable plate rotates by a certain angle relative to the mounting plate);

[0049] Figure 5 is Figure 3 a schematic diagram of another angle;

[0050] Figure 6 FIG. is an installation schematic diagram of the movable plate and the mounting plate in an embodiment of the present utility model;

[0051] Figure 7 FIG. is an exploded view of the movable plate and the mounting plate in an embodiment of the present utility model;

[0052] Figure 8 FIG. is an installation schematic diagram of the noise reduction device and the panel in an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0053] The present utility model will be further described in detail below in conjunction with the embodiments of the drawings.

[0054] Refer to Figures 1 to 7 , which is a preferred embodiment of the noise reduction device of the present utility model. The noise reduction device includes a sound-absorbing cover 1, a base 2, a sound-absorbing member (not shown in the figure), a movable component 200, a second driving member 20, a third driving member 8 and other main components.

[0055] Among them, the inside of the sound-absorbing cover 1 is hollow and has an opening. The sound-absorbing cover 1 has noise reduction holes 11; the sound-absorbing cover 1 is hemispherical; the sound-absorbing cover 1 is provided with an oil drain port 12 communicating with the noise reduction cavity 70 at a position adjacent to the base 2.

[0056] Refer to Figure 2, the base 2 is arranged at the open end and encloses a noise reduction cavity 70 with the sound absorption cover 1; the base 2 has a gear ring 21.

[0057] The sound absorption member is arranged in the noise reduction cavity 70. The sound absorption member is made of sound absorption cotton or other sound absorption materials.

[0058] See Figures 5 to 7 , the movable component 200 has a noise reduction through hole 31 and is at least partially constrained in the noise reduction cavity 70 in a manner that can move relative to the sound absorption cover 1; along the direction of the noise entering the sound absorption cover 1, the movable component 200 is located upstream of the sound absorption member. Specifically, the movable component 200 includes a mounting plate 5, a movable plate 3, and a first driving member 4. The mounting plate 5 has a groove 51, and the groove 51 can also be replaced by a perforation; the movable plate 3 has a noise reduction through hole 31, and the movable plate 3 is constrained on the mounting plate 5 and movably penetrates through the groove 51; the size of the noise reduction through hole 31 of the movable plate 3 is smaller than the size of the noise reduction hole 11 of the sound absorption cover 1. When the noise reduction through hole 31 is in the shape of a strip extending along the length direction, the size of the noise reduction through hole 31 refers to the width of the through hole. The mounting plate 5 and the movable plate 3 are arc-shaped, and the bending direction of the arc is the same as that of the sound absorption cover 1. See Figure 5 , the first driving member 4 is used to drive the movable plate 3 in and out of the groove 51 to adjust the overlapping area between the movable plate 3 and the sound absorption cover 1. See Figures 2 to 5 , a gear 6 and a fixed rod 7 are further arranged in the noise reduction cavity 70. The gear 6 meshes with the inner wall of the gear ring 21; both ends of the fixed rod 7 are fixed to the rotating shaft part of the gear 6 and the movable plate 3 respectively; the first driving member 4 is drivingly connected to the input end of the gear 6 to drive the gear 6 to rotate along the gear ring 21, thereby driving the movable plate 3 in and out of the groove 51.

[0059] A second driving member 20 is arranged in the noise reduction cavity 70 and is drivingly connected to the mounting plate 5 to drive the movable component 200 to approach or move away from the sound absorption cover 1 along the direction of the noise entering the sound absorption cover 1. Correspondingly, the base 2 has a movable space for the movable component 200 to move at the corresponding position. See Figures 3 to 5, the connection structure between the second driving member 20 and the movable assembly 200 adopts a crank-slider structure disposed in the noise reduction cavity. Specifically, the mounting post 10 has an open cavity 10a and a side wall opening 10b communicating with the cavity 10a, and the mounting post 10 is for mounting the second driving member 20. One end of the crank 30 is drivingly connected to the output end of the second driving member 20. One end of the connecting rod 40 is rotatably connected to the other end of the crank 30. The slider 50 is rotatably connected to the other end of the connecting rod 40 and passes through the side wall opening 10b of the mounting post 10; the elastic member 90 is disposed in the cavity 10a of the mounting post 10 and is in a compressed energy storage state under the action of the slider 50. The elastic member 90 has a tendency to release energy to reset the slider 50, and the elastic member 90 is an elastic column or an elastic sheet or a spring. The limiting post 60 is disposed on the mounting post 10 in a manner that can axially move relative to the mounting post 10 and is relatively fixed to the mounting post 10 in the circumferential direction. The connecting plate 80 is located between the mounting plate 5 and the slider 50, is connected to the mounting plate 5 and the slider 50, and the connecting plate 80 is connected to the limiting post 60.

[0060] See Figures 2 to 5 , the third driving member 8 is disposed in the noise reduction cavity 70 and is drivingly connected to the mounting plate 5, so as to drive the mounting plate 5 in a state of being attached to the inner wall of the sound absorption cover 1 to move along the inner wall of the sound absorption cover 1. Specifically, the third driving member 8 drives the mounting post 10 to rotate to drive the mounting plate 5 to rotate.

[0061] The first driving member 4, the second driving member 20, and the third driving member 8 adopt motors, or pneumatic devices can also be used.

[0062] The present utility model further includes a range hood, including the above-mentioned noise reduction device. See Figure 8 , the range hood includes a vertically extending panel 100, and the base 2 is connected to the panel 100. The panel 100 is a part of the fan frame, the base 2 is connected to the inner wall surface of the fan frame, and the sound absorption cover 1 faces the air inlet of the volute (not shown in the figure).

[0063] The working principle and the using process are as follows.

[0064] When it is necessary to adjust the position of the movable plate 3 relative to the mounting plate 5, the first driving member 4 drives the movable plate 3 to move relative to the mounting plate 5, so as to adjust the overlapping area between the movable plate 3 and the sound absorption cover 1.

[0065] When it is necessary to adjust the positions of the mounting plate 5 and the movable plate 3 relative to the sound-absorbing cover 1, the second driving member 20 drives the slider 50 to move through the crank 30 and the connecting rod 40. The movement of the slider 50 drives the connecting plate 80 to move, and the connecting plate 80 drives the mounting plate 5 to move, so as to adjust the mounting plate 5 and the movable plate 3 to approach or move away from the sound-absorbing cover 4. In addition, after the sound-absorbing member, such as sound-absorbing cotton, adsorbs oil stains, it will expand. By moving the mounting plate 5 away from the sound-absorbing cover 4, the oil-absorbing cotton can be squeezed, which is convenient for the sound-absorbing cotton to discharge excess oil stains. The oil stains are discharged from the noise reduction device through the oil drain port 12. At the same time, the oil squeezed out of the sound-absorbing cotton can also lubricate parts such as the mounting post 10.

[0066] After the noise reduction device is used for a period of time, oil stains may adhere to the inner wall of the sound-absorbing cover 1. The third driving member 8 drives the mounting plate 5 to move along the inner wall of the sound-absorbing cover 1, so that the mounting plate 5 can scrape off the oil stains on the inner wall of the sound-absorbing cover 1, prevent the noise reduction holes 11 of the sound-absorbing cover 1 from being blocked, and thus improve the noise reduction effect of the sound-absorbing cover 1.

[0067] Part of the noise entering the sound-absorbing cover 1 is absorbed by the sound-absorbing member, and the other part is absorbed by the movable component 200, reflected by the inner wall of the movable component 200, reflected by the inner wall of the sound-absorbing cover 1, and lost through the gap between the inner walls of the movable component 200 and the sound-absorbing cover 1, or is continuously absorbed by the sound-absorbing member. In this way, the noise reduction device can be applied to different noise frequency bands. According to needs, the movable component can be adjusted to different positions.

Claims

1. A noise reduction device, comprising A sound absorbing cover (1) is hollow inside and has an opening, and the sound absorbing cover (1) has a noise reduction hole (11); A base (2) is arranged at the open position and forms a noise reduction chamber (70) with the sound absorbing cover (1); A sound absorbing member, arranged in the noise reduction chamber (70); It is characterized in that: the noise reduction device also includes A movable component (200) having a noise reduction through hole (31) and at least partially restrained in the noise reduction chamber (70) in a manner capable of moving relative to the sound absorbing cover (1); Along the direction in which noise enters the sound absorbing cover (1), the movable component (200) is located upstream of the sound absorbing element.

2. The noise reduction device according to claim 1, characterized in that: The movable component (200) comprises A mounting plate (5) having perforations or grooves (51); A movable plate (3) having a noise reduction through hole (31), the movable plate (3) being constrained on the mounting plate (5) and movably inserted into the through hole or groove (51); The first driving member (4) is used to drive the movable plate (3) to enter and exit the perforation or groove (51) to adjust the overlapping area between the movable plate (3) and the sound absorbing cover (1).

3. The noise reduction device according to claim 2, characterized in that: The base (2) has a gear ring (21); The noise reduction chamber (70) is also provided with: The gear (6) is meshed with the inner wall of the ring gear (21); A fixed rod (7), both ends of which are respectively fixed to the rotating shaft of the gear (6) and the movable plate (3); The first driving member (4) is drivingly connected to the input end of the gear (6), and drives the gear (6) to rotate along the gear ring (21), thereby driving the movable plate (3) to enter and exit the perforation or groove (51).

4. The noise reduction device according to claim 2, characterized in that: The noise reduction device comprises The second driving member (20) is disposed in the noise reduction chamber (70) and is drivingly connected to the mounting plate (5), thereby driving the movable assembly (200) to move closer to or farther away from the sound absorbing cover (1) along the direction in which the noise enters the sound absorbing cover (1).

5. The noise reduction device according to claim 4, characterized in that: The noise reduction chamber (70) is provided with: A mounting column (10) having an open cavity (10a) and a side wall opening (10b) communicating with the cavity (10a), and the mounting column (10) is used for mounting the second driving member (20); A crank (30), one end of which is drivingly connected to the output end of the second driving member (20); A connecting rod (40), one end of which is rotatably connected to the other end of the crank (30); A slider (50) is rotatably connected to the other end of the connecting rod (40) and passes through the side wall opening (10b) of the mounting column (10); An elastic member (90) is disposed in a cavity (10a) of the mounting column (10) and is in a compressed energy storage state under the action of the slider (50). The elastic member (90) has a tendency to release energy and reset the slider (50); A limiting column (60) is arranged on the mounting column (10) in a manner that it can move axially relative to the mounting column (10), and is relatively fixed to the mounting column (10) in the circumferential direction; The connecting plate (80) is located between the mounting plate (5) and the sliding block (50), and is connected to the mounting plate (5) and the sliding block (50). The connecting plate (80) is also connected to the limiting column (60).

6. The noise reduction device according to claim 2, characterized in that: The noise reduction device also includes The third driving member (8) is arranged in the noise reduction chamber (70) and is drivingly connected to the mounting plate (5), thereby driving the mounting plate (5) in a state of being in contact with the inner wall of the sound absorbing cover (1) to move along the inner wall of the sound absorbing cover (1).

7. The noise reduction device according to claim 2, characterized in that: The sound absorbing cover (1) is hemispherical; The mounting plate (5) and the movable plate (3) are arc-shaped, and the bending direction of the arc is consistent with the bending direction of the sound absorbing cover (1).

8. The noise reduction device according to claim 2, characterized in that: The size of the noise reduction through hole (31) of the movable plate (3) is smaller than the size of the noise reduction hole (11) of the sound absorbing cover (1).

9. The noise reduction device according to claim 1, characterized in that: The sound absorbing cover (1) is provided with an oil discharge port (12) in communication with the noise reduction chamber (70) at a position adjacent to the base (2).

10. A range hood, characterized in that: It comprises the noise reduction device as described in any one of claims 1 to 9.

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