A noise reduction shield cover device and a shield pump having the same

Abstract

The utility model discloses a shielding cover device of reducing noise discloses having shielding pump of shielding cover device of reducing noise, a shielding cover device of reducing noise includes friction bearing and shielding cover. Friction bearing rotation is arranged on motor shaft. Shielding cover includes connecting portion and sound wave reflection part. Connecting portion sets up on friction bearing. Sound wave reflection part is connected with connecting portion. Shielding cover and motor casing enclose motor cabin, and motor rotor is contained in motor cabin. Shielding cover cooperates motor casing and friction bearing, and motor rotor is enclosed in motor cabin, prevents sound wave and escapes from motor cabin, realizes preliminary noise reduction. The noise sound wave that motor rotor sent is continuously reflected and is digested in motor cabin, and then in the process of continuously reflecting and spreading, a part of energy is gradually consumed, and another part and the sound wave that rotor newly produces superposition digestion, realizes the noise reduction.

Description

Technical Field

[0001] This utility model relates to the field of shielded pump technology, and in particular to a noise-reducing shielded cover device and a shielded pump having the same. Background Technology

[0002] Canned motor pumps, as highly leak-proof fluid transport equipment, are widely used in the handling of hazardous media in chemical, pharmaceutical, and other fields. They achieve zero-leakage operation through an integrated sealing structure; however, the high-speed rotation of the motor, impeller fluid vibration, and the coupling effect of mechanical components can easily generate significant noise. Especially in enclosed workshops or precision laboratory environments, noise levels can reach over 80 dB. Long-term exposure not only harms personnel's hearing health but may also induce equipment resonance, leading to seal failure or bearing wear, severely restricting equipment reliability and adaptability to various environments.

[0003] Traditional noise reduction solutions are mostly based on passive sound insulation principles. Traditional shielded pumps typically involve adding a sound insulation layer between the motor housing and the pump body, or covering the pump body with sound-absorbing cotton or installing a metal soundproof cover. While such designs can partially block high-frequency noise, they have significant limitations:

[0004] Firstly, the rigid connection between the sound insulation layer and the pump body easily creates a sound bridge effect, causing mid-to-low frequency vibrations to be transmitted through the structure, thus exacerbating noise diffusion.

[0005] Secondly, dense sound insulation materials hinder heat dissipation from the motor, leading to accelerated temperature rise, insulation aging, and shortened equipment lifespan.

[0006] Third, fixed soundproof structures require complete disassembly to maintain internal components, increasing maintenance costs.

[0007] Another approach involves adding rubber damping pads to the pump body base. While this can reduce some mechanical vibration, it has limited effect on suppressing broadband noise caused by fluid pulsation. Furthermore, long-term pressure can lead to material creep, causing the damping performance to gradually deteriorate. Utility Model Content

[0008] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a noise-reducing shielding cover device, which can significantly reduce the noise generated by the pump motor rotor and improve the user experience.

[0009] This utility model also proposes a shielded pump with the aforementioned noise reduction shielding cover device.

[0010] A noise reduction shielding cover device according to a first aspect of the present invention includes a friction bearing rotatably mounted on a motor shaft; a shielding cover including a connecting portion and a sound wave reflecting portion, the connecting portion being disposed on the friction bearing, the sound wave reflecting portion being connected to the connecting portion, the shielding cover and a motor housing forming a motor compartment, the motor compartment being configured to accommodate a motor rotor; the sound wave reflecting portion including a first extension portion, a reflecting cone surface, a second extension portion, a third extension portion, a reflecting arc surface, and a fourth extension portion connected in sequence, the inner ring of the first extension portion being connected to the connecting portion. The second extension is parallel to the first extension, the third extension is parallel to the first extension, the reflective cone is inclined to the first extension, and the third extension is perpendicular to the second extension. The first extension, the reflective cone, the second extension, the third extension, the reflective arc surface, and the fourth extension are all used to reflect noise sound waves. The fourth extension is used to fit the motor housing to achieve motor compartment sealing. The reflective arc surface is set as a smooth curved surface extending from the third extension to the fourth extension, and the tangent angle of the reflective arc surface changes by more than 90 degrees.

[0011] It has at least the following beneficial effects: The shielding cover, together with the motor housing and friction bearings, encloses the motor rotor within the motor compartment, preventing sound waves from escaping and achieving initial noise reduction. The noise waves emitted by the motor rotor are continuously reflected and dissipated within the motor compartment. Some noise waves, upon contact with the reflective cone surface, are reflected onto the reflective arc surface. The arc surface of the reflective arc surface can further scatter the noise waves. In conjunction with the first extension, second extension, third extension, and motor housing, the noise waves generated by the motor rotor are continuously reflected within the motor compartment. Thus, during the continuous reflection and propagation process, some energy is gradually consumed, while the other part is superimposed and dissipated with newly generated sound waves from the motor rotor, achieving further noise reduction.

[0012] According to some embodiments of the present invention, the acoustic wave reflecting part further includes a plurality of reflecting protrusions, which are disposed on the first extension part. The plurality of reflecting protrusions are evenly distributed circumferentially along the first extension part, and the reflecting protrusions protrude toward the direction of the motor rotor.

[0013] According to some embodiments of this utility model, the reflective protrusions are in four groups.

[0014] According to some embodiments of the present invention, the projection of the reflective protrusion on the first extension is rectangular.

[0015] According to some embodiments of this utility model, it also includes a sound vent, which is opened on the sound wave reflecting part and can transmit the noise sound waves generated by the motor rotor to the water pump impeller cavity.

[0016] According to some embodiments of the present invention, the sound-venting hole is formed on the first extension portion, and the sound-venting hole is elliptical.

[0017] According to some embodiments of the present invention, there are several sound-venting holes, and the several sound-venting holes are opened in the middle of the reflective protrusion.

[0018] According to some embodiments of this utility model, there are two sets of sound-venting holes, which are respectively opened on two opposite sets of reflective protrusions, and the inner diameters of the two sets of sound-venting holes are different.

[0019] According to some embodiments of the present invention, the acoustic wave reflecting part further includes a plurality of reflecting protrusions, which are uniformly disposed on the reflecting arc surface, and the protrusions of the plurality of reflecting protrusions protrude toward the axis of the shielding cover.

[0020] A shielded pump according to a second aspect of the present invention includes a noise-reducing shielding cover device according to the first aspect of the present invention described above.

[0021] It has at least the following beneficial effects: This shielded pump has all the beneficial effects brought about by the aforementioned noise reduction shielding cover device, which will not be repeated here.

[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1 This is a schematic diagram of the structure of the first aspect embodiment of the present utility model;

[0025] Figure 2 This is a front view of the first aspect embodiment of the present utility model;

[0026] Figure 3 This is a cross-sectional view of the first aspect of the present invention;

[0027] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0028] Figure 5 This is a schematic diagram of the structure of the first aspect embodiment of the present invention after the motor housing is installed.

[0029] Reference numerals: friction bearing 10, shielding cover 20, connecting part 21, sound wave reflecting part 22, first extension part 221, reflecting cone surface 222, second extension part 223, third extension part 224, reflecting arc surface 225, fourth extension part 226, reflecting protrusion 227, reflecting boss 228, sound leakage hole 30. Detailed Implementation

[0030] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] In the description of this utility model, the use of "first" and "second" is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features or the order of the technical features.

[0032] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0033] Reference Figures 1 to 5 This utility model discloses a noise reduction shielding cover device, including a friction bearing 10 and a shielding cover 20. The friction bearing 10 is rotatably mounted on a motor shaft. The shielding cover 20 includes a connecting part 21 and a sound wave reflecting part 22. The connecting part 21 is disposed on the friction bearing 10. The sound wave reflecting part 22 is connected to the connecting part 21. The shielding cover 20 and the motor housing form a motor compartment, and the motor compartment is configured to accommodate the motor rotor.

[0034] In the embodiments of this utility model, the shielding cover 20, together with the motor housing and the friction bearing 10, encloses the motor rotor in the motor compartment to prevent sound waves from escaping from the motor compartment, thereby achieving initial noise reduction.

[0035] The sound wave reflecting part 22 includes a first extension 221, a reflecting cone surface 222, a second extension 223, a third extension 224, a reflecting arc surface 225, and a fourth extension 226 connected in sequence. The inner ring of the first extension 221 is connected to the connecting part 21. The second extension 223 is parallel to the first extension 221. The third extension 224 is parallel to the first extension 221. The reflecting cone surface 222 is inclined to the first extension 221. The third extension 224 is perpendicular to the second extension 223. The first extension 221, the reflecting cone surface 222, the second extension 223, the third extension 224, the reflecting arc surface 225, and the fourth extension 226 are all used to reflect noise sound waves. The fourth extension 226 is used to fit the motor housing to achieve motor compartment sealing. The reflecting arc surface 225 is configured as a smooth curved surface extending from the third extension 224 to the fourth extension 226. The tangent angle of the reflective arc surface 225 changes by more than 90 degrees.

[0036] In the embodiments of this utility model, the noise sound waves emitted by the motor rotor are continuously reflected and dissipated within the motor compartment. After contacting the reflective cone surface 222, some of the noise sound waves are reflected by the reflective cone surface 222 to the reflective arc surface 225. The arc surface of the reflective arc surface 225 can further scatter the noise sound waves. In conjunction with the first extension part 221, the second extension part 223, the third extension part 224 and the motor housing, the noise sound waves generated by the motor rotor are continuously reflected within the motor compartment. In the process of continuous reflection and propagation, some energy is gradually consumed, and the other part is superimposed and dissipated with the newly generated sound waves of the rotor, thereby achieving noise reduction.

[0037] It should be noted that the irregular structure of the shielding cover 20 can also improve the structural strength of the shielding cover 20, reduce the thickness of the shielding cover 20, reduce the processing difficulty, and save production costs.

[0038] Reference Figure 2 and Figure 3 The acoustic wave reflecting part 22 also includes a plurality of reflective protrusions 227. The reflective protrusions 227 are disposed on the first extension part 221. The plurality of reflective protrusions 227 are evenly distributed circumferentially along the first extension part 221. The protrusion direction of the reflective protrusions 227 is close to the motor rotor.

[0039] It should be noted that the reflective protrusion 227 can further increase the surface irregularity of the first extension 221, enhance the complexity of sound wave reflection, realize diffuse reflection of sound waves, and dissipate sound waves.

[0040] It is worth noting that in some embodiments of this invention, there are four sets of reflective protrusions 227. Through repeated experimental verification, the four sets of reflective protrusions 227 have achieved a better noise shielding effect.

[0041] It is worth noting that in some embodiments of this utility model, the projection of the reflective protrusion 227 onto the first extension 221 is rectangular.

[0042] In some embodiments, a portion of the plane of the reflective protrusion 227 is parallel to the first extension 221. The distance between the reflective protrusion 227 and the first extension 221 relative to the rotor is different, which results in a difference in the waveform of the reflected sound wave, which will cancel each other out and thus reduce noise.

[0043] Reference Figures 1 to 4 The noise reduction shielding cover device also includes a sound vent 30. The sound vent 30 is formed on the sound wave reflecting part 22, and the sound vent 30 can transmit the noise sound waves generated by the rotor to the water pump impeller cavity.

[0044] It should be noted that through the sound vent 30, a portion of the sound waves can be transmitted from the motor compartment to the pump impeller cavity. The sound waves generated by the water flow in the pump impeller cavity will partially cancel out the rotor noise, while the other portion of the sound waves will propagate with the medium in the pump impeller cavity and will not propagate out to generate noise.

[0045] It is worth noting that in some embodiments of this utility model, the sound vent 30 is formed on the first extension portion 221. The sound vent 30 is elliptical.

[0046] Understandably, the narrow, elliptical sound vent 30 can serve as a filter to reduce some of the sound waves.

[0047] It should be noted that in some other embodiments of this utility model, the sound vent 30 may also be a narrow slot.

[0048] It is worth noting that in some embodiments of this utility model, there are multiple sound-venting holes 30. These multiple sound-venting holes 30 are located in the center of the reflective protrusion 227.

[0049] It is worth noting that in some embodiments of this utility model, there are two sets of sound vents 30. The two sets of sound vents 30 are respectively opened on two opposing sets of reflective protrusions 227, and the two sets of sound vents 30 are of different sizes. Through the sound vents 30 of different sizes, uneven sound waves can be transmitted from the two sound vents 30 to the water pump impeller cavity, further increasing the complexity of sound wave reflection and causing partial dissipation.

[0050] Reference Figure 3 The acoustic wave reflecting part 22 also includes a plurality of reflecting protrusions 228. The plurality of reflecting protrusions 228 are evenly disposed on the reflecting arc surface 225. The protruding direction of the plurality of reflecting protrusions 228 is towards the axial direction of the shielding cover 20.

[0051] It is worth noting that the reflective boss 228 can also increase the complexity of sound wave reflection in the motor compartment, perform irregular reflection, gradually dissipate sound wave energy, and reduce noise.

[0052] It is worth noting that in some other embodiments of this utility model, the motor housing and the shielding cover 20 are combined to form a motor compartment, the motor rotor and the motor shaft are placed inside the motor compartment, and a sealing ring is provided between the motor housing and the shielding cover 20. The sealing ring can seal the gap between the motor housing and the shielding cover 20, prevent sound waves from passing through the gap, and reduce noise transmission.

[0053] This utility model provides a shielded pump, which has the aforementioned noise reduction shielding cover device installed inside, and has all the beneficial effects it brings, which will not be repeated here.

[0054] In a second aspect of this invention, a shielded pump is provided, wherein the motor inside the pump body is provided with a noise-reducing shielding cover device as described in the first aspect, which can significantly reduce the noise of the shielded pump.

[0055] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A noise-reducing cover device, characterized in that include: Friction bearing (10), which is rotatably mounted on the motor shaft; The shielding cover (20) includes a connecting part (21) and a sound wave reflecting part (22). The connecting part (21) is disposed on the friction bearing (10). The sound wave reflecting part (22) is connected to the connecting part (21). The shielding cover (20) and the motor housing form a motor compartment. The motor compartment is configured to accommodate the motor rotor. The acoustic wave reflecting part (22) includes a first extension part (221), a reflecting cone surface (222), a second extension part (223), a third extension part (224), a reflecting arc surface (225), and a fourth extension part (226) connected in sequence. The inner ring of the first extension part (221) is connected to the connecting part (21). The second extension part (223) is parallel to the first extension part (221). The third extension part (224) is parallel to the first extension part (221). The reflecting cone surface (222) is inclined to the first extension part (221). The third extension part... (224) is perpendicular to the second extension (223). The first extension (221), the reflective cone (222), the second extension (223), the third extension (224), the reflective arc surface (225), and the fourth extension (226) are all used to reflect noise sound waves. The fourth extension (226) is used to fit the motor housing to achieve motor compartment sealing. The reflective arc surface (225) is set as a smooth curved surface extending from the third extension (224) to the fourth extension (226). The tangent angle of the reflective arc surface (225) changes by more than 90 degrees.

2. The noise reducing cover device of claim 1, wherein The acoustic wave reflecting part (22) further includes a plurality of reflecting protrusions (227), which are disposed on the first extension part (221). The plurality of reflecting protrusions (227) are evenly distributed circumferentially along the first extension part (221), and the reflecting protrusions (227) protrude toward the direction of the motor rotor.

3. A noise reducing cover device according to claim 2, wherein The reflective protrusions (227) are in four groups.

4. A noise reducing cover device according to claim 2 or 3, characterised in that The projection of the reflective protrusion (227) onto the first extension (221) is rectangular.

5. A noise-reducing shielding cover device according to claim 4, characterized in that, It also includes a sound vent (30), which is opened on the sound wave reflecting part (22). The sound vent (30) can transmit the noise sound wave generated by the motor rotor to the water pump impeller cavity.

6. A noise-reducing shielding cover device according to claim 5, characterized in that, The sound vent (30) is located on the first extension (221), and the sound vent (30) is elliptical.

7. A noise-reducing shielding cover device according to claim 5, characterized in that, There are several sound-venting holes (30), and several sound-venting holes (30) are opened in the middle of the reflective protrusion (227).

8. A noise-reducing shielding cover device according to claim 7, characterized in that, The sound leakage holes (30) are in two sets, and the two sets of sound leakage holes (30) are respectively opened on the two sets of opposite reflective protrusions (227). The inner diameters of the two sets of sound leakage holes (30) are different.

9. A noise-reducing shielding cover device according to claim 4, characterized in that, The acoustic wave reflecting part (22) further includes a plurality of reflecting protrusions (228), which are evenly arranged on the reflecting arc surface (225) and protrude toward the axis of the shielding cover (20).

10. A canned pump, characterized in that, Includes a noise reduction shielding cover device as described in any one of claims 1 to 9.

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