Centrifugal fan with noise reduction device

Abstract

The utility model discloses a centrifugal fan with a noise reduction device, which relates to the technical field of centrifugal fans, and comprises a centrifugal fan body and a driving motor for driving the centrifugal fan body to work, a noise reduction box is fixed on the back side of the centrifugal fan body, and the noise reduction box covers the outer side of the driving motor. The noise reduction box is internally provided with a knocking structure and a first spring piece set, the knocking structure rotates along with rotation of an output shaft of the driving motor through the transmission structure, and through the arrangement of the knocking structure, the first spring piece set and the transmission structure, vibration force generated by the first spring piece set and vibration force generated by the centrifugal fan body can influence each other; therefore, the vibration frequency and amplitude of the centrifugal fan body are reduced, and noise reduction is realized; meanwhile, during knocking, the first spring piece group can generate sound waves which interfere with noise, so that the noise generated during operation of the driving motor in the noise reduction box is weakened or even eliminated, and a better noise reduction effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to centrifugal fan technical field, especially centrifugal fan with noise reduction device. BACKGROUND

[0002] Centrifugal fan is relied on input mechanical energy, improves gas pressure and sends gas, it is a kind of driven fluid machinery, centrifugal fan works and can produce very big noise, the source of these noises is the vibration of machine operation, and the friction vibration generated when airflow passes through centrifugal fan inner cavity.

[0003] Through the search, the patent file with the announcement number "CN219509898U" discloses a centrifugal fan noise reduction structure, including base, fan shell, impeller and motor, the motor is installed and fixed on the base, the output end side of the motor is provided with the fan shell, the impeller is located inside the fan shell and is connected with the motor output end rotation, the fan shell is provided with air inlet and air outlet, and the centrifugal fan noise reduction structure further includes a noise reduction assembly installed on the air outlet, the noise reduction assembly includes a noise reduction pipe and a noise reduction plate, the noise reduction plate is obliquely installed on the lower part of the noise reduction pipe and separates the pipe cavity in the lower part of the noise reduction pipe into a plurality of air ducts with horn-shaped cross sections, and the inner wall of the upper part of the noise reduction pipe is provided with sound-absorbing cotton.

[0004] Based on the above search, combined with the prior art, it is found that even if the driving motor cover is arranged in the box, vibration and noise will still be generated during the operation of the motor, and the noise elimination effect of the box cover is not obvious, so a centrifugal fan with a noise reduction device is needed. UTILITY MODEL CONTENTS

[0005] The purpose of the present application is to provide a centrifugal fan with a noise reduction device to solve the problems raised in the background art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a centrifugal fan with a noise reduction device, including a centrifugal fan body and a driving motor for driving the centrifugal fan body to work, a noise reduction box is fixed to the back side of the centrifugal fan body, and the noise reduction box covers the outside of the driving motor.

[0007] A knocking structure and a first spring sheet group are installed in the noise reduction box, the knocking structure rotates with the output shaft of the driving motor through a transmission structure, and knocks the first spring sheet group.

[0008] The first spring sheet group is fixedly connected to the back side of the centrifugal fan body close to the driving motor.

[0009] As a further supplement to the present scheme, the knocking structure includes:

[0010] A connecting ring is drivingly connected with the output shaft of the driving motor through a transmission structure.

[0011] The rotating rod is fixed at one end with the connecting ring.

[0012] The knocking hammer head is fixed at the other end of the rotating rod away from the connecting ring, and the knocking hammer head knocks the spring leaf in the first spring leaf group during the rotation.

[0013] As a further supplement to the scheme, the first spring leaf group comprises a plurality of spring leaf groups, which are evenly distributed around the central axis of the connecting ring, and each spring leaf group comprises a plurality of spring leaves, which are arranged linearly along the radial direction of the connecting ring.

[0014] The rotating rod is a telescopic rod.

[0015] As a further supplement to the scheme, the rotating rod comprises a sleeve rod and a movable rod, the sleeve rod is fixed at one end with the connecting ring, and the movable rod is slidingly inserted into the sleeve rod and elastically connected with the sleeve rod through a tension spring.

[0016] As a further supplement to the scheme, the second spring leaf group is further fixedly installed on the inner top of the noise reduction box through a connecting plate, the second spring leaf group comprises a plurality of vertically arranged spring leaves, and the vibration frequencies generated when the plurality of spring leaves are knocked are different.

[0017] The knocking hammer head is a double-head structure, and the two hammer heads of the knocking hammer head knock the spring leaves in the first spring leaf group and the second spring leaf group, respectively, during the rotation.

[0018] As a further supplement to the scheme, the transmission structure comprises a follower ring, a transmission ring, a transmission belt and a transmission shaft.

[0019] The follower ring is fixedly sleeved on the output shaft of the driving motor, the transmission ring is rotatably connected with the back side of the centrifugal fan body through the transmission shaft, the transmission belt is sleeved between the follower ring and the transmission ring, and the end of the transmission shaft away from the centrifugal fan body is rotatably connected with the inner top wall of the noise reduction box through the mounting rod.

[0020] The connecting ring is fixedly sleeved on the transmission shaft.

[0021] In summary, the technical effects and advantages of the utility model are as follows:

[0022] 1. The utility model discloses a knock structure, first spring piece group and the setting of transmission structure, when the drive motor is operated, the output shaft of drive motor drives the knock structure to rotate through transmission structure, and the spring piece in first spring piece group is knocked when the knock structure rotates, thereby make first spring piece group produce the vibration of different frequency with centrifugal fan body, the vibration force that first spring piece group produces can influence each other with the vibration force that centrifugal fan body produces, eliminate each other, thereby reduce the vibration frequency and amplitude of centrifugal fan body, realize the noise reduction, simultaneously, first spring piece group can also produce the sound wave that disturbs the noise when knocking, thereby weaken even eliminate the noise in the noise reduction box that produces when the drive motor is operated, reach better noise reduction effect.

[0023] 2. The utility model discloses a rotating rod is set to telescopic rod body, when the drive motor speed changes, transmission structure drives the connecting ring to change the speed along with, produces different size centrifugal force, and the movable rod is under the action of different size centrifugal force and the elasticity of tensile spring and stretches different distance, thereby make the rotating path of the knocking hammer head change, and contact with different spring piece, so this can knock the different spring piece in first spring piece group, produce different vibration force and sound wave to cope with the different vibration and noise that produce when the drive motor speed changes, can reach according to the different operation state of centrifugal fan body and drive motor and carry out the effect of self -adaptation noise reduction, more flexible and effective when using. ACCURACY

[0024] In order to more clearly illustrate the technical scheme in the embodiment of the present application or prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0025] Figure 1 It is a three-dimensional structure schematic view in the embodiment of the present application;

[0026] Figure 2 It is a front view when the noise reduction box is cut open in the embodiment of the present application;

[0027] Figure 3 It is the distribution schematic view of knock structure, transmission structure and first spring piece group in the embodiment of the present application;

[0028] Figure 4 It is the rotating rod sectional view in the embodiment of the present application.

[0029] In the figure: 1, centrifugal fan body; 2, driving motor; 3, noise reduction box; 4, knocking structure; 41, connecting ring; 42, rotating rod; 421, sleeve rod; 422, movable rod; 43, knocking hammer head; 44, tension spring; 5, first spring leaf group; 6, transmission structure; 61, follow-up ring; 62, transmission ring; 63, transmission belt; 64, transmission shaft; 7, second spring leaf group; 8, mounting rod. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0031] Embodiment: refer to Figures 1-4 The centrifugal fan with a noise reduction device shown in the figure, including centrifugal fan body 1 and driving centrifugal fan body 1 operation driving motor 2, centrifugal fan body 1 back side fixed with noise reduction box 3, noise reduction box 3 cover is set in driving motor 2 outside;

[0032] Knocking structure 4 and first spring leaf group 5 are installed in noise reduction box 3, and knocking structure 4 rotates through transmission structure 6 with the output shaft of driving motor 2 and knocks first spring leaf group 5.

[0033] First spring leaf group 5 is fixedly connected to the back side of centrifugal fan body 1 close to driving motor 2.

[0034] Based on the above structure, when driving motor 2 operates, the output shaft of driving motor 2 drives knocking structure 4 to rotate through transmission structure 6, and the spring leaf in first spring leaf group 5 is knocked when knocking structure 4 rotates, so that first spring leaf group 5 generates vibration of different frequency from centrifugal fan body 1, and the vibration force generated by first spring leaf group 5 can influence and eliminate each other with the vibration force generated by centrifugal fan body 1, so as to reduce the vibration frequency and amplitude of centrifugal fan body 1, realize noise reduction; At the same time, first spring leaf group 5 can also generate sound wave that interferes with noise when knocking (its principle refers to the principle of phase cancellation of sound), so as to weaken or even eliminate the noise generated in noise reduction box 3 when driving motor 2 operates, and achieve better noise reduction effect.

[0035] Further, knocking structure 4 includes:

[0036] Connecting ring 41, connecting ring 41 is drivingly connected with the output shaft of driving motor 2 through transmission structure 6;

[0037] Rotating rod 42, one end of rotating rod 42 is fixed with connecting ring 41;

[0038] The knocking hammer head 43 is fixed to the end of the rotating rod 42 away from the connecting ring 41, and the knocking hammer head 43 knocks the spring leaf in the first spring leaf group 5 during rotation;

[0039] The first spring leaf group 5 includes multiple spring leaf groups that are evenly distributed around the central axis of the connecting ring 41, and each spring leaf group includes multiple spring leaves that are arranged linearly along the radial direction of the connecting ring 41.

[0040] The rotating rod 42 is a telescopic rod, and the rotating rod 42 includes a sleeve rod 421 and a movable rod 422. The sleeve rod 421 is fixed to one end of the connecting ring 41, and the movable rod 422 is slidingly inserted into the sleeve rod 421. The movable rod 422 is elastically connected to the sleeve rod 421 by a tension spring 44.

[0041] When the rotating speed of the driving motor 2 changes, the connecting ring 41 changes the rotating speed driven by the transmission structure 6, generating different centrifugal forces. The movable rod 422 extends different distances under the action of different centrifugal forces and the elastic force of the tension spring 44, so that the rotating path of the knocking hammer head 43 changes and contacts different spring leaves. In this way, different spring leaves in the first spring leaf group 5 can be knocked, different vibration forces and sound waves can be generated to cope with different vibrations and noises generated when the rotating speed of the driving motor 2 changes, and the effect of self-adaptive noise reduction according to different operating states of the centrifugal fan body 1 and the driving motor 2 can be achieved, which is more flexible and effective in use.

[0042] Further, the second spring leaf group 7 is fixedly installed on the top of the noise reduction box 3 by a connecting plate. The second spring leaf group 7 includes multiple vertically arranged spring leaves, and the vibration frequencies generated when the multiple spring leaves are knocked are different.

[0043] The knocking hammer head 43 has a double-head structure, and the two hammer heads of the knocking hammer head 43 knock the spring leaves in the first spring leaf group 5 and the second spring leaf group 7, respectively, during rotation.

[0044] Through the arrangement of the second spring leaf group 7, the knocking hammer head 43 can knock the spring leaves in the first spring leaf group 5 and the second spring leaf group 7 simultaneously or at different times (by arranging the spring leaves in the first spring leaf group 5 and the second spring leaf group 7 to be positionally corresponding or staggered) during rotation, thereby generating multiple interference vibrations and multiple sound waves to interfere with and eliminate different vibrations and different noises generated when the centrifugal fan body 1 and the driving motor 2 are working, thereby achieving a more comprehensive noise reduction effect.

[0045] Further, the transmission structure 6 includes a follower ring 61, a transmission ring 62, a transmission belt 63, and a transmission shaft 64.

[0046] The follow ring 61 is fixedly sleeved on the output shaft of the driving motor 2, the transmission ring 62 is rotatably connected with the back side of the centrifugal fan body 1 through the transmission shaft 64, the transmission belt 63 is sleeved between the follow ring 61 and the transmission ring 62, and the one end of the transmission shaft 64 away from the centrifugal fan body 1 is rotatably connected with the inner top wall of the noise reduction box 3 through the mounting rod 8.

[0047] The connecting ring 41 is fixedly sleeved on the transmission shaft 64.

[0048] The utility model discloses a working principle: in the daily use process, the output shaft rotation of driving motor 2 is driven to rotate through follow ring 61, transmission ring 62, transmission belt 63 and transmission shaft 64 and drives the rotation of connecting ring 41, and when the rotation of connecting ring 41 drives the rotation of rotating rod 42 and knock hammer head 43, knock hammer head 43 can simultaneously or not simultaneously knock the spring leaf in first spring leaf group 5 and second spring leaf group 7, and first spring leaf group 5 produces the vibration of different frequency with centrifugal fan body 1, and the vibration force produced by first spring leaf group 5 can influence each other with the vibration force produced by centrifugal fan body 1, and eliminate each other, thereby reducing the vibration frequency and amplitude of centrifugal fan body 1, realize the noise reduction, and simultaneously, first spring leaf group 5 can also produce the sound wave of interference to noise when knocking, thereby weakening or even eliminating the noise produced in noise reduction box 3 when the operation of driving motor 2, reach better noise reduction effect, and second spring leaf group 7 is knocked and produces multiple interference vibrations and multiple sound waves same or different with first spring leaf group 5, to interfere and eliminate the different vibration and different noise produced when centrifugal fan body 1 and driving motor 2 work, thereby playing more comprehensive noise reduction effect.

[0049] Finally, it should be pointed out that: the above-mentioned only for the preferred embodiment of the utility model and does not limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for the person skilled in the art, still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of technical features, any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model, should be included in the protection scope of the utility model.

Claims

1. A centrifugal fan with noise reduction device, comprising a centrifugal fan body (1) and a driving motor (2) driving the centrifugal fan body (1) to work, and a noise reduction box (3) is fixed on the back side of the centrifugal fan body (1), and the noise reduction box (3) covers the outside of the driving motor (2), characterized in that: a knocking structure (4) and a first spring piece group (5) are installed in the noise reduction box (3), the knocking structure (4) rotates with the output shaft of the driving motor (2) through a transmission structure (6) and knocks the first spring piece group (5); the knocking structure (4) comprises a connecting ring (41), a rotating rod (42) and a knocking hammer head (43), the connecting ring (41) is in transmission connection with the output shaft of the driving motor (2) through the transmission structure (6); one end of the rotating rod (42) is fixed with the connecting ring (41), and the knocking hammer head (43) is fixed with the end of the rotating rod (42) away from the connecting ring (41), and the knocking hammer head (43) knocks the spring piece in the first spring piece group (5) during rotation; the first spring piece group (5) is fixedly connected to the back side of the centrifugal fan body (1) close to the driving motor (2); the first spring piece group (5) comprises a plurality of spring piece groups, the plurality of spring piece groups are uniformly distributed around the central axis of the connecting ring (41), each spring piece group comprises a plurality of spring pieces, and the plurality of spring pieces are arranged in a straight line along the radial direction of the connecting ring (41); the rotating rod (42) is a telescopic rod body; the rotating rod (42) comprises a sleeve rod (421) and a movable rod (422), one end of the sleeve rod (421) is fixed with the connecting ring (41), the movable rod (422) is slidably inserted into the sleeve rod (421), and the movable rod (422) is elastically connected with the sleeve rod (421) through a tension spring (44); a second spring piece group (7) is further fixedly installed on the top of the noise reduction box (3) through a connecting plate, the second spring piece group (7) comprises a plurality of vertically arranged spring pieces, and the vibration frequencies generated when the plurality of spring pieces are knocked are different; the knocking hammer head (43) is a double-head structure, and the two hammer heads of the knocking hammer head (43) respectively knock the spring pieces in the first spring piece group (5) and the second spring piece group (7) during rotation; the transmission structure (6) comprises a follow-up ring (61), a transmission ring (62), a transmission belt (63) and a transmission shaft (64); the follow-up ring (61) is fixedly sleeved on the output shaft of the driving motor (2), the transmission ring (62) is rotatably connected with the back side of the centrifugal fan body (1) through the transmission shaft (64), the transmission belt (63) is sleeved between the follow-up ring (61) and the transmission ring (62), and one end of the transmission shaft (64) away from the centrifugal fan body (1) is rotatably connected with the top wall in the noise reduction box (3) through a mounting rod (8); and the connecting ring (41) is fixedly sleeved on the transmission shaft (64). ​ ​ ​ ​ 2. A centrifugal fan with noise reduction device according to claim 1, characterized in that: ​ ​ 3. A centrifugal fan with noise reduction device according to claim 2, characterized in that: ​ 4. A centrifugal fan with noise reduction device according to claim 2, characterized in that: ​ 5. A centrifugal fan with noise reduction means according to claim 4, characterized in that: ​ 6. A centrifugal fan with noise reduction device according to claim 1, characterized in that: ​ ​ ​

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