Shielding cover device capable of reducing noise and shield pump with shielding cover device

Abstract

The invention discloses a shielding cover device capable of reducing noise, and discloses a shielding pump with the shielding cover device capable of reducing noise, and the shielding cover device capable of reducing noise comprises a friction bearing and a shielding cover. And the friction bearing is rotationally arranged on the motor shaft. The shielding cover comprises a connecting part and a sound wave reflecting part. And the connecting part is arranged on the friction bearing. The sound wave reflecting part is connected with the connecting part. A motor cabin is defined by the shielding cover and the motor shell, and the motor rotor is contained in the motor cabin. The shielding cover is matched with the motor shell and the friction bearing, the motor rotor is sealed in the motor cabin, sound waves are prevented from being dissipated out of the motor cabin, and preliminary noise reduction is achieved. Noise sound waves emitted by a motor rotor are continuously reflected and digested in a motor cabin, so that in the continuous reflection and propagation process, one part of energy is gradually consumed, the other part of energy is superposed and digested with sound waves newly generated by the rotor, and noise reduction is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of shielded pumps, and in particular to a shielding cover device for reducing noise and a shielded pump having the same. Background Art

[0002] Shielded pumps, as highly sealed fluid conveying equipment, are widely used in high-risk media processing fields such as the chemical and pharmaceutical industries. Their integrated sealing structure achieves zero-leakage operation, but the high-speed rotation of the motor, the fluid excitation of the impeller, and the coupling of mechanical components can easily cause significant noise. Especially in closed factories or precision laboratory environments, noise levels can reach over 80dB. Long-term exposure not only harms personnel's hearing health but can also induce equipment resonance, leading to seal failure or bearing wear, seriously limiting equipment reliability and adaptability to specific scenarios. Traditional noise reduction solutions are mostly based on passive sound insulation principles. Traditional shielded pumps mostly add a sound insulation layer between the motor housing and the water pump, or cover the pump body with sound insulation cotton or install a metal sound insulation cover. Although such designs can partially block high-frequency noise, they have obvious limitations: First, the rigid connection between the sound insulation layer and the pump body easily forms a sound bridge effect, causing low- and medium-frequency vibrations to be transmitted through the structure and exacerbate noise diffusion; Second, dense sound insulation materials hinder the heat dissipation of the motor, causing temperature rise to accelerate insulation aging and shorten the life of the equipment; Third, the fixed sound insulation structure needs to be disassembled as a whole to maintain the internal components, which increases operation and maintenance costs.

[0003] Another proposal attempts to add rubber shock-absorbing pads to the base of the pump body. Although this can weaken some mechanical vibrations, it has limited effect on suppressing broadband noise caused by fluid pulsation. In addition, long-term pressure can easily cause material creep, and the shock-absorbing performance gradually decays. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a noise-reducing shielding cover device that can significantly reduce the noise generated by the pump motor rotor and improve the user experience.

[0005] The present invention also provides a shielded pump having the above-mentioned shielding cover device for reducing noise.

[0006] According to a first aspect of an embodiment of the present invention, a shielding cover device for reducing noise includes a friction bearing, the friction bearing being rotatably arranged on a motor shaft; a shielding cover, the shielding cover including a connecting portion and a sound wave reflecting portion, the connecting portion being arranged on the friction bearing, the sound wave reflecting portion being connected to the connecting portion, the shielding cover and the motor housing forming a motor cabin, the motor cabin being configured to accommodate a motor rotor; the sound wave reflecting portion including a first extension portion, a reflection cone, a second extension portion, a third extension portion, a reflection 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 portion is parallel to the first extension portion, the third extension portion is parallel to the first extension portion, the reflective conical surface is inclined to the first extension portion, the third extension portion is perpendicular to the second extension portion, the first extension portion, the reflective conical surface, the second extension portion, the third extension portion, the reflective arc surface and the fourth extension portion are all used to reflect noise waves, the fourth extension portion is used to fit the motor housing to achieve motor cabin sealing, the reflective arc surface is set to be a smooth curved surface extending from the third extension portion to the fourth extension portion, and the tangent angle of the reflective arc surface changes by more than 90 degrees.

[0007] The invention has at least the following beneficial effects: the shielding cover cooperates with the motor housing and the friction bearing to enclose the motor rotor within the motor compartment, preventing sound waves from escaping the motor compartment and achieving preliminary noise reduction. The noise waves emitted by the motor rotor are continuously reflected and dissipated within the motor compartment. After contacting the reflection cone, some of the noise waves are reflected by the reflection cone onto the reflection arc surface. The arc surface of the reflection arc surface can further scatter the noise waves. In conjunction with the first extension portion, the second extension portion, the third extension portion, and the motor housing, the noise waves generated by the motor rotor are continuously reflected within the motor compartment. In the process of continuous reflection and propagation, part of the energy is gradually consumed, and the remaining part is superimposed and dissipated with the new sound waves generated by the motor rotor, achieving further noise reduction.

[0008] According to some embodiments of the present invention, the sound wave reflecting portion further includes a plurality of reflecting protrusions, which are arranged on the first extension portion, and the plurality of reflecting protrusions are evenly distributed along the circumference of the first extension portion, and the reflecting protrusions protrude toward the motor rotor.

[0009] According to some embodiments of the present invention, the reflective protrusions are arranged in four groups.

[0010] According to some embodiments of the present invention, the projection of the reflective protrusion on the first extension portion is a rectangle.

[0011] According to some embodiments of the present invention, a sound leakage hole is further included. The sound leakage hole is opened on the sound wave reflecting part, and the sound leakage hole can transmit the noise sound waves generated by the motor rotor to the water pump impeller cavity.

[0012] According to some embodiments of the present invention, the sound leakage hole is provided on the first extension portion, and the sound leakage hole is elliptical.

[0013] According to some embodiments of the present invention, there are a plurality of sound leakage holes, and the plurality of sound leakage holes are opened in the middle of the reflective protrusion.

[0014] According to some embodiments of the present invention, there are two groups of sound leakage holes, which are respectively opened on two opposite groups of reflective protrusions, and the inner diameters of the two groups of sound leakage holes are different.

[0015] According to some embodiments of the present invention, the sound wave reflecting portion further includes a plurality of reflecting bosses, the plurality of reflecting bosses are evenly arranged on the reflecting arc surface, and the protruding directions of the plurality of reflecting bosses protrude toward the axis of the shielding cover.

[0016] A shielded pump according to an embodiment of a second aspect of the present invention includes a shielding cover device for reducing noise according to an embodiment of the first aspect of the present invention.

[0017] At least the following beneficial effects are achieved: the shielded pump has all the beneficial effects brought about by the above-mentioned shielding cover device for reducing noise, which will not be described again here.

[0018] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which: Figure 1 This is a schematic structural diagram of an embodiment of the first aspect of the present invention; Figure 2 A front view of an embodiment of the first aspect of the present invention; Figure 3 A cross-sectional view of an embodiment of the first aspect of the present invention; Figure 4 for Figure 3 A partial enlarged view of point A in the middle; Figure 5 This is a schematic structural diagram of the embodiment of the first aspect of the present invention after installation with the motor housing.

[0020] Reference numerals: friction bearing 10 , shielding cover 20 , connecting portion 21 , sound wave reflecting portion 22 , first extension portion 221 , reflecting cone 222 , second extension portion 223 , third extension portion 224 , reflecting arc surface 225 , fourth extension portion 226 , reflecting protrusion 227 , reflecting boss 228 , sound leakage hole 30 . DETAILED DESCRIPTION

[0021] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] In the description of the present invention, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0023] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0024] Reference Figures 1 to 5 The present invention discloses a noise-reducing 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 portion 21 and a sound wave reflecting portion 22. The connecting portion 21 is mounted on the friction bearing 10. The sound wave reflecting portion 22 is connected to the connecting portion 21. The shielding cover 20 and the motor housing form a motor compartment, which is configured to accommodate the motor rotor.

[0025] In the embodiment of the present invention, the shielding cover 20 cooperates with the motor housing and the friction bearing 10 to enclose the motor rotor in the motor compartment, preventing sound waves from escaping from the motor compartment, thereby achieving preliminary noise reduction.

[0026] The sound wave reflecting portion 22 includes a first extension portion 221, a reflective cone 222, a second extension portion 223, a third extension portion 224, a reflective arc 225, and a fourth extension portion 226, which are connected in sequence. The inner ring of the first extension portion 221 is connected to the connecting portion 21. The second extension portion 223 is parallel to the first extension portion 221. The third extension portion 224 is parallel to the first extension portion 221. The reflective cone 222 is inclined relative to the first extension portion 221. The third extension portion 224 is perpendicular to the second extension portion 223. The first extension portion 221, the reflective cone 222, the second extension portion 223, the third extension portion 224, the reflective arc 225, and the fourth extension portion 226 all function to reflect noise sound waves. The fourth extension portion 226 is designed to fit the motor housing to achieve a sealed motor compartment. The reflective arc 225 is a smooth curved surface extending from the third extension portion 224 to the fourth extension portion 226. The tangent angle of the reflective arc surface 225 varies by more than 90 degrees.

[0027] In an embodiment of the present invention, the noise sound waves emitted by the motor rotor are continuously reflected and eliminated in the motor cabin. After contacting the reflection cone 222, part of the noise sound waves will be reflected by the reflection cone 222 to the reflection arc surface 225. The arc surface of the reflection 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 in the motor cabin. In the process of continuous reflection and propagation, part of the energy is gradually consumed, and the other part is superimposed and eliminated with the new sound waves generated by the rotor to achieve noise reduction.

[0028] 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.

[0029] Reference Figure 2 and Figure 3 The sound wave reflecting portion 22 further includes a plurality of reflecting protrusions 227. The reflecting protrusions 227 are provided on the first extension portion 221. The reflecting protrusions 227 are evenly distributed along the circumference of the first extension portion 221. The protruding direction of the reflecting protrusions 227 is close to the motor rotor.

[0030] It should be noted that the reflective protrusions 227 can further increase the surface irregularity of the first extension portion 221, enhance the complexity of sound wave reflection, achieve diffuse reflection of the sound waves, and eliminate the sound waves.

[0031] It is worth noting that, in some embodiments of the present invention, there are four groups of reflective protrusions 227. After repeated experiments, it was verified that four groups of reflective protrusions 227 can achieve a better noise shielding effect.

[0032] It is worth noting that, in some embodiments of the present invention, the projection of the reflective protrusion 227 on the first extension portion 221 is a rectangle.

[0033] In some embodiments, a portion of the reflective protrusion 227 has a structural plane parallel to the first extension portion 221 , and the distance between the reflective protrusion 227 and the first extension portion 221 relative to the rotor is different, so that the waveforms of the reflected sound waves will be different and will cancel each other out, thereby reducing noise.

[0034] Reference Figures 1 to 4 A shielding cover device for reducing noise further includes a sound leakage hole 30. The sound leakage hole 30 is opened on the sound wave reflecting portion 22, and the sound leakage hole 30 can transmit the noise sound waves generated by the rotor to the water pump impeller cavity.

[0035] It should be noted that, through the sound leakage hole 30, a part of the sound waves can be transmitted from the motor compartment to the water pump impeller cavity. The sound waves generated by the water flow in the water pump impeller cavity itself will cancel out part of the rotor noise, and the other part of the sound waves will propagate along the medium in the water pump impeller cavity and will not propagate out to generate noise.

[0036] It is worth noting that, in some embodiments of the present invention, the sound leakage hole 30 is provided on the first extension portion 221. The sound leakage hole 30 is elliptical.

[0037] It is understandable that the narrow and long elliptical sound leakage hole 30 can play a partial filtering role to eliminate part of the sound waves.

[0038] It should be noted that, in some other embodiments of the present invention, the sound leakage hole 30 may also be a narrow and long slot.

[0039] It is worth noting that, in some embodiments of the present invention, there are a plurality of sound leakage holes 30 , and the plurality of sound leakage holes 30 are opened in the middle of the reflective protrusion 227 .

[0040] It is worth noting that in some embodiments of the present invention, two groups of sound leakage holes 30 are provided. These two groups of sound leakage holes 30 are respectively provided on two opposing groups of reflective protrusions 227, and the two groups of sound leakage holes 30 are of different sizes. The different sizes of sound leakage holes 30 allow uneven sound waves to be transmitted from the two sound leakage holes 30 to the water pump impeller cavity, further increasing the complexity of sound wave reflections and partially eliminating them.

[0041] Reference Figure 3 The sound wave reflecting portion 22 further includes a plurality of reflecting bosses 228. The plurality of reflecting bosses 228 are evenly arranged on the reflecting arc surface 225. The projection direction of the plurality of reflecting bosses 228 is toward the axis direction of the shielding cover 20.

[0042] It is worth noting that the reflective boss 228 can also increase the complexity of the reflection of the sound waves in the motor cabin, perform irregular reflection, gradually dissipate the sound wave energy, and reduce noise.

[0043] It is worth noting that in some other embodiments of the present invention, the motor housing and the shielding cover 20 are combined to form a motor cabin, the motor rotor and the motor shaft are placed in the motor cabin, 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 to prevent sound waves from transmitting from the gap and reduce noise propagation.

[0044] The present invention provides a shielded pump, which is internally installed with the above-mentioned shielding cover device for reducing noise. It has all the beneficial effects brought by it, and will not be repeated here.

[0045] In a second aspect of the present invention, a shielded pump is provided, wherein a motor in the pump body of the shielded pump is provided with a noise-reducing shielding cover device according to the first aspect, which can significantly reduce the noise of the shielded pump.

[0046] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0047] Of course, the present invention is not limited to the above-mentioned embodiments. Those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

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

2. A noise reducing shielding cover device according to claim 1, characterized in that: The sound wave reflecting portion (22) further comprises a plurality of reflecting protrusions (227), the reflecting protrusions (227) being arranged on the first extension portion (221), the plurality of reflecting protrusions (227) being evenly distributed along the circumference of the first extension portion (221), and the reflecting protrusions (227) protruding towards the direction of the motor rotor.

3. The noise reducing shielding cover device according to claim 2, characterized in that: The reflective protrusions (227) are four groups.

4. A noise reducing shielding cover device according to claim 2 or 3, characterized in that: The projection of the reflective protrusion (227) on the first extension portion (221) is a rectangle.

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

6. The noise reducing shielding cover device according to claim 5, characterized in that: The sound leakage hole (30) is provided on the first extension portion (221), and the sound leakage hole (30) is elliptical.

7. The noise reducing shielding cover device according to claim 5, characterized in that: There are a plurality of sound leakage holes (30), and the plurality of sound leakage holes (30) are opened in the middle of the reflective protrusion (227).

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

9. The noise reducing shielding cover device according to claim 4, characterized in that: The sound wave reflecting portion (22) further comprises a plurality of reflecting bosses (228), wherein the plurality of reflecting bosses (228) are evenly arranged on the reflecting arc surface (225), and the plurality of reflecting bosses (228) protrude in the direction of the axis of the shielding cover (20).

10. A canned motor pump, characterized in that: A noise reducing shielding cover device comprising the device described in any one of claims 1 to 9.

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