Motor air outlet silencing cover with bearing cooling function

Abstract

The utility model discloses a motor air outlet noise reduction cover capable of cooling a bearing, which relates to the technical field of motor noise reduction, and comprises a cover cylinder, end plates, outer side plates, a cover plate, a flow guide plate and noise reduction sheets, the side surface of the cover cylinder is provided with an opening, and the two ends of the opening of the side surface of the cover cylinder are respectively and fixedly connected with the outer side plates. Two parallel end plates are arranged between the outer side plates, a cover plate is arranged in the direction, away from the machine base, of the silencing cover, a plurality of guide plates distributed in the radial direction are arranged on the side, away from an opening, in the cover cylinder, a plurality of silencing pieces are arranged at the position of the opening of the cover cylinder, one end of each silencing piece is approximately flush with the end, away from the cover cylinder, of the corresponding end plate, and the other end of each silencing piece is flush with the corresponding end plate. And a distance is kept between the other end of the silencing sheet and the bearing seat. The air outlet noise reduction and bearing temperature reduction device gives consideration to noise reduction and bearing temperature reduction, is obvious in effect, can be flexibly combined according to different requirements, is convenient to install and use, and is suitable for noise reduction and bearing temperature reduction of air outlets of cylindrical motors, especially motors with peripheral pipe distribution structures.

Description

Technical Field

[0001] The utility model relates to the technical field of motor sound insulation, and particularly relates to a motor air outlet sound insulation cover that takes into account bearing cooling. Background Technique

[0002] The IEC (International Electrotechnical Commission) standard has strict requirements for the noise level of industrial motors. Research shows that motor noise mainly includes: structure noise generated by electromagnetic excitation in the motor and pneumatic noise generated by the internal air flow used to cool the motor. Among them, pneumatic noise is usually related to the speed of the motor. For example, for a cylindrical motor, during operation, due to the forced air flow of the fan for heat dissipation, obvious pneumatic noise will be generated. If this part of the noise is not properly handled, it will have a series of adverse effects on the working environment and surrounding areas. First of all, excessive noise pollution will not only affect the comfort and auditory health of on-site workers, reduce work efficiency, but also may lead to hearing loss and other physical and mental health complications after long-term exposure to a high-intensity noise environment. To reduce the noise of air-cooled motors, sound insulation covers are usually set at the air inlet and air outlet of the motor. The air outlet structure of the cylindrical motor is as Figure 8 shown, including a frame 6, an end cover 7, a bearing seat 8, a motor shaft 9 and a coupling 10. The end cover 7 is installed on the end face of the frame, the bearing seat is installed on the end cover 6, the motor shaft 9 is installed on the bearing seat 8 and extends out of the bearing, and the end of the motor shaft 9 is connected to the load through the coupling 10.

[0003] The existing air outlet sound insulation cover structures usually only have the function of noise reduction, or need to cooperate with other devices to simultaneously have a certain function of reducing the bearing temperature, or sacrifice the noise reduction effect to improve the effect of reducing the bearing temperature.

[0004] The utility model patent with the patent publication number CN213585391 discloses a heat dissipation structure for reducing the temperature of the motor shaft extension end. An extension end sound insulation end cover is provided at the extension end of the motor shaft; a non-extension end sound insulation end cover is provided at the non-extension end of the motor, and a fan for motor cooling is provided inside the non-extension end sound insulation end cover; an air guide pipe is provided between the non-extension end sound insulation end cover and the extension end sound insulation end cover; the air guide pipe is located outside the motor, and one end of the air guide pipe is communicated with the non-extension end sound insulation end cover, and the other end of the air guide pipe passes through the inside of the extension end sound insulation end cover and extends to the lower part of the extension end of the motor shaft; a rotatable elbow is provided at the end of the air guide pipe passing through the extension end sound insulation end cover.

[0005] However, in this patent, the hot air at the motor air outlet is isolated from the bearing, and cold air is introduced in a single path to cool the bearing. Its disadvantages are that although the air temperature is low, the flow rate is small, and it blows only locally, while the hot air has a slightly higher temperature but a large air volume and blows the bearing housing comprehensively. Therefore, the cooling effect of the small-air-volume cold air is poor, and the small area of the motor air outlet channel results in a large air resistance. This patent does not disclose an internal noise reduction structure.

[0006] The invention patent application with the patent publication number CN102769350A discloses a silencing cover for the air outlet of a motor cooler, which includes a housing with an air inlet and an air outlet. Sound-absorbing materials are laid on the inner wall of the housing, and a perforated plate is fixed outside the sound-absorbing materials. Reinforcing ribs are fixed on the inner wall of the housing in a crisscross pattern, and the sound-absorbing materials are filled in the frame formed by the reinforcing ribs and the housing. Without changing the original structure of the air outlet of the cooler, the present invention adds a silencing cover for the air outlet, and a perforated plate and sound-absorbing materials are arranged inside the silencing cover, which can reduce the outgoing air noise of the cooler in multiple ways, thereby reducing the operating noise of the motor. Reinforcing ribs are fixed on the inner wall of the housing in a crisscross pattern. On the one hand, the sound-absorbing structure is divided into multiple small units, making the placement of the sound-absorbing materials more uniform and preventing large displacements during use. On the other hand, the strength of the entire device is enhanced.

[0007] However, this silencing cover structure is only applicable to square box motors with an integral cooler and cannot be used for cylindrical motors. Moreover, it only has a noise reduction function and no effect on reducing the bearing temperature.

[0008] Therefore, providing a silencing cover for the air outlet of a motor that takes into account bearing cooling is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0009] The present utility model aims to provide a silencing cover for the air outlet of a motor that takes into account bearing cooling, which has the advantages of taking into account noise reduction and bearing temperature reduction, with obvious effects, being flexibly combinable according to different requirements, convenient for installation and use, and applicable to the air outlet noise reduction and bearing temperature reduction of cylindrical motors, especially motors with a pipe layout structure around them.

[0010] In order to achieve the above-mentioned invention purpose, the technical solution of the present utility model is as follows:

[0011] A silencing cover for the air outlet of a motor that takes into account bearing cooling, comprising a cover cylinder. The cover cylinder is a hollow cylindrical structure with both ends penetrating. A long strip-shaped opening is provided on the side of the cover cylinder. One end of the cover cylinder is fixedly connected to the end face of the motor base. Outer side plates are respectively fixedly connected to both sides of the long strip-shaped opening. One end of each outer side plate is respectively connected to the long strip-shaped opening of the cover cylinder, and the other end of each outer side plate extends away from the motor shaft. Two parallel end plates are respectively arranged between the two outer side plates. The near-motor-shaft sides of the end plates are respectively fixedly connected to the outer side surface of the cover cylinder; an air outlet channel is formed between the end plates and the outer side plates; A cover plate is arranged in the direction away from the base of the silencing cover. The outer circle of the cover plate is fixedly connected to the cover cylinder, and the inner circle of the cover plate is in clearance fit with the motor shaft or the coupling; On the side of the cover cylinder far from the opening, a plurality of guide plates distributed radially are arranged. There is no gap or a small gap between the guide plates and the cover cylinder, and there is a gap between the guide plates and the bearing seat; A plurality of silencing sheets are arranged at the opening of the cover cylinder. One end of the silencing sheet is approximately flush with the end plate in the direction away from the cover cylinder, and the other end of the silencing sheet keeps a distance from the bearing seat.

[0012] The arc length of the opening range of the cover cylinder accounts for 17 - 50% of the circumference.

[0013] The included angle θ between the outer side plates of the silencing covers on both sides is 0 - 150°.

[0014] The silencing sheets at the opening are distributed radially or parallelly along the length direction of the end plate; Non-uniform distribution can be set according to the air volume of the motor air outlet. When distributed radially, the ratio of the maximum included angle to the minimum included angle between adjacent silencing sheets is between 1 and 4. When distributed parallelly, the ratio of the maximum distance to the minimum distance between adjacent silencing sheets is between 1 and 4. The axial length of the silencing sheets here is 50% - 100% of the silencing cover cylinder, and the length dimension in the radial (or height) direction is between 20% and 80% of the outer diameter of the silencing cover cylinder. The radial length dimensions are of equal length or unequal length. When unequal, the ratio of the longest to the shortest is between 1 and 5.

[0015] The cover cylinder is fixedly connected to the base through a mounting flange.

[0016] The cover plate is of a split structure, and the number of split parts is 2 - 8.

[0017] The cover plate is of a circular ring, conical or stepped structure.

[0018] The inner and outer surfaces of the cover plate, cover cylinder, end plates and outer side plates are provided with a sound-absorbing layer.

[0019] The beneficial effects of the present utility model:

[0020] 1. In this utility model, the air discharged from the motor away from the opening side of the cover cylinder is guided by the deflector plate inside the cover cylinder and then blows towards the bearing, and then flows upward out of the soundproof cover. The air flow generated on the side away from the opening of the cover cylinder first passes through the deflector plate inside the cover cylinder for guiding and rectifying treatment. Subsequently, the air flow guided by the deflector plate is accurately guided to the bearing part to effectively cool it, ensuring that the working temperature of the bearing is maintained within an appropriate range and extending the service life of the bearing. Finally, the air flow that has completed the heat dissipation task continues to flow upward and finally discharges outside the soundproof cover. The whole process not only optimizes the working efficiency of the motor heat dissipation system but also greatly reduces noise pollution, creating a quiet and stable operating environment. Through such a design, it not only meets the requirement of bearing cooling during the operation of the motor but also takes into account the noise reduction function, achieving good comprehensive effects.

[0021] 2. In this utility model, a soundproof cover plate is used to completely (or nearly completely) seal the bearing (air outlet) axially, and the air flow does not (or rarely) flow out of the soundproof cover axially; since the soundproof cover plate tightly closes the air outlet of the bearing, the air flow cannot directly flow out axially, thus effectively preventing the noise generated due to air flow impact or turbulence. This further improves the soundproof performance of the entire motor system, making the operation more stable and quiet. Although the soundproof cover plate restricts the axial air flow, the reasonable guidance of the air flow will be considered during the design to ensure that the air flow can efficiently blow towards the bearing after passing through the soundproof sheet inside the cover cylinder, providing the necessary cooling effect for the bearing. The soundproof cover plate not only plays a sealing role but also can prevent external dust, impurities, etc. from entering the motor interior through the bearing air outlet to a certain extent. This helps to maintain the cleanliness inside the motor, reduce failures and wear caused by impurities. For motors used outdoors, it also effectively avoids the heating effect of solar radiation on the bearing, thereby reducing the bearing temperature and extending the service life of the motor. Through the sealing effect of the soundproof cover plate, the structure of the entire motor system is more compact and stable, reducing potential problems caused by air flow leakage or turbulence. This helps to improve the reliability and stability of the entire system and reduce the failure rate.

[0022] 3. In this utility model, a soundproof layer is laid on the inner surface or outer surface of the cover cylinder, end plate, and outer side plate. The main function of the soundproof layer is to absorb and dissipate noise energy. By laying a soundproof layer on the inner surface or outer surface of the cover cylinder, end plate, and outer side plate, the noise generated during the operation of the motor can be effectively absorbed, thereby reducing the propagation and diffusion of noise, making the motor operation quieter, and improving the quality of the overall working environment.

[0023] 4. In this utility model, the cover plate adopts a split structure design, which is convenient for users to install the coupling and maintain the bearing. This design reduces the gap between the cover plate and the shaft or coupling, effectively reducing air flow and noise leakage, and improving the operation experience.

[0024] 5. In the present utility model, the cross-section design of the cover plate is flexible and variable, and can be selected according to the actual requirements of the diversion effect, manufacturing cost and the size of the coupling. The circular ring has a simple shape and is easy to manufacture, and is particularly applicable when the size of the coupling of the known user is known; the conical shape can effectively improve the bearing cooling effect, and the size of the cover plate can be determined even when the size of the coupling is unknown, but the manufacturing is relatively complex and the wind resistance of the external air path is slightly larger; the stepped design is complex to manufacture, but the size can also be determined without the size of the coupling.

[0025] 6. In the present utility model, the design of the sound-absorbing sheet at the radial air outlet is flexible, and parallel distribution or radial distribution can be selected. When in parallel distribution, the distance between the air outlet and the center of the motor can be flexibly adjusted. By setting sound-absorbing sheets with unequal lengths (the ratio of the longest to the shortest is 1 to 4), a better noise reduction effect can be achieved; at the same time, unequal-distance distribution (the ratio of the farthest to the nearest is 1 to 3) is adopted to optimize the air flow distribution and reduce the wind resistance. The radial distribution is more suitable for motors with a surrounding pipe cooling structure. The sound-absorbing plate is arranged at the non-ventilation hole part between adjacent ventilation holes, usually with an equal-length design, which is structurally compact and saves space. Description of the Drawings

[0026] Figure 1 Schematic structural diagram of the sound-absorbing cover at the motor air outlet of Embodiment 1 of the present utility model.

[0027] Figure 2 Axial sectional view of the sound-absorbing cover at the motor air outlet of Embodiment 1 of the present utility model.

[0028] Figure 3 Radial sectional view of the sound-absorbing cover at the motor air outlet of Embodiment 1 of the present utility model.

[0029] Figure 4 Schematic structural diagram of the cover plate of the sound-absorbing cover at the motor air outlet of Embodiment 1 of the present utility model.

[0030] Figure 5 Axial sectional view of the sound-absorbing cover at the motor air outlet of Embodiment 2 of the present utility model.

[0031] Figure 6 Radial sectional view of the sound-absorbing cover at the motor air outlet of Embodiment 2 of the present utility model.

[0032] Figure 7 Radial sectional view of the sound-absorbing cover at the motor air outlet of Embodiment 3 of the present utility model.

[0033] Figure 8 Schematic structural diagram of the air outlet structure of the cylindrical motor.

[0034] Among them, 1. Cover cylinder; 2. End plate; 3. Outer side plate; 4. Sound-absorbing sheet; 5. Cover plate; 6. Machine base; 7. End cover; 8. Bearing seat; 9. Motor shaft; 10. Coupling; 11. Deflector. Specific embodiments

[0035] The present utility model will be further described in detail below in conjunction with embodiments, but the embodiments of the present utility model are not limited thereto.

[0036] Embodiment 1

[0037] This embodiment provides a silencing cover for the motor air outlet that takes into account bearing cooling as shown in Figures 1-3 the figure,

[0038] including a cover cylinder 1, the cover cylinder 1 is a hollow cylindrical structure with both ends penetrating, and a long strip-shaped opening is provided on the side of the cover cylinder 1.

[0039] One end of the cover cylinder 1 is fixedly connected to the end face of the motor base 6. Outer side plates 3 are fixedly connected to both sides of the long strip-shaped opening. One ends of the outer side plates 3 are respectively connected to the long strip-shaped opening of the cover cylinder 1. The other ends of the outer side plates 3 respectively extend away from the motor shaft 9. Two parallel end plates 2 are respectively arranged between the two outer side plates 3. The near-motor-shaft-9 sides of the end plates 2 are respectively fixedly connected to the outer side surface of the cover cylinder 1; an air outlet channel is formed between the end plates 2 and the outer side plates 3; a cover plate 5 is arranged in the direction away from the base 6 of the silencing cover, and the outer circle of the cover plate 5 is fixedly connected to the cover cylinder 1.

[0040] The axial length of the cover cylinder is 100 mm from the end face of the coupling 10.

[0041] The inner circle of the cover plate 5 is in clearance fit with the coupling 10; a plurality of radially distributed guide plates 11 are arranged on the side of the cover cylinder 1 far from the opening. There is a small gap between the guide plates 11 and the cover cylinder 1, and a gap is provided between the guide plates 11 and the bearing seat 8; a plurality of silencing sheets 4 are arranged at the opening of the cover cylinder 1. One end of the silencing sheet 4 is approximately flush with the direction away from the cover cylinder 1 of the end plate 2, and the other end of the silencing sheet 4 keeps a distance from the bearing seat 8.

[0042] The arc length of the opening range of the cover cylinder 1 accounts for 42% of the circumference. The included angle θ between the outer side plates 3 of the silencing cover on both sides is 150°. The outer side plates 3 are respectively radially distributed at both ends of the opening of the cover cylinder 1. The end plates 2 are arranged in a fan-shaped structure between the two outer side plates 3; the silencing sheets 4 at the opening are evenly distributed radially; the axial length of the cover cylinder 1 does not exceed the end face of the coupling 10; as shown in Figure 4 the figure, the cover plate 5 is made of a circular ring-shaped sound-absorbing material; the cover plate 5 is a split structure, and the number of split parts is 2; the inner and outer surfaces of the cover cylinder 1, the end plates 2 and the outer side plates 3 are provided with sound-absorbing layers.

[0043] The air outlet structure of the motor is as shown in Figure 8As shown, it includes a machine base 6, an end cover 7, a bearing housing 8, a motor shaft 9 and a coupling 10. The end cover 7 is installed on the end face of the machine base, the bearing housing is installed on the end cover 6, the motor shaft 9 is installed on the bearing housing 8 and extends out from the bearing, and the end of the motor shaft 9 is connected to the load through the coupling 10.

[0044] In this embodiment, after the cooling air flow of the motor flows out from the air outlet, the air flow at the bottom passes through the flow guide plate 11 and the cover cylinder 1 channel, blows on the surface of the bearing housing 8, cools the surface of the bearing housing 8 and then flows to the muffler air outlet; while the air flow of the motor air outlet without the flow guide plate 11 flows to the muffler air outlet through the channel formed by the cover cylinder 1 and the nearest flow guide plate 11. Since the air flow flows in the muffler cavity, and the inner surfaces of the cover cylinder 1, the end plate 2 and the outer side plate 3 in the muffler cavity are all provided with sound-absorbing layers; therefore, the noise is absorbed and blocked by the muffler during the air flow process. Thus, the effect of reducing noise and reducing the bearing temperature is achieved.

[0045] Embodiment 2

[0046] Compared with Embodiment 1, the distinguishing feature of this embodiment is that, as Figures 5-6 shown, in this embodiment, the arc length of the opening range of the cover cylinder 1 accounts for 50% of the circumference; the included angle θ between the two outer side plates 3 of the muffler is 0°, the outer side plates 3 are respectively arranged in parallel at both ends of the opening of the cover cylinder 1, the outer side plates 3 are distributed in the direction away from the bearing housing 8, the end plate 2 is arranged in a rectangular structure between the two outer side plates 3, and the sound-absorbing sheets 4 at the opening are evenly distributed along the direction parallel to the outer side plate 3; the sound-absorbing sheets 4 are of unequal length, and the ratio of the longest to the shortest is 4:1;

[0047] There is a clearance fit between the inner circle of the cover plate 5 and the side surface of the motor shaft 9; there is no clearance between the sound-absorbing sheet 4 and the cover cylinder 1; the number of split pieces of the cover plate 5 is 8; the cover plate 5 is of a conical structure, and the rest of the structure is the same as that of Embodiment 1.

[0048] In this embodiment, the sound-absorbing sheet 4 adopts an unequal-length design to maximize the use of the air flow path, effectively increase the sound-absorbing area, and thus significantly reduce the noise level. At the same time, the design of the conical cover plate 5 enhances the wind speed blowing towards the bearing housing 8, improves the convective heat transfer effect, and ensures better cooling effect of the bearing housing 8. In addition, the inner hole size of the conical cover plate 5 can be determined according to the outer circle of the motor shaft 9, without relying on the size of the user's coupling 10, providing greater flexibility for the user. However, the manufacturing difficulty of the conical cover plate 5 is slightly greater than that of the circular ring, and attention needs to be paid during the production process.

[0049] Embodiment 3

[0050] Compared with Embodiment 1, the distinguishing feature of this embodiment is that, as Figure 7As shown, in this embodiment, the arc length of the opening range of the cover cylinder 1 accounts for 17% of the circumference; the sound-absorbing sheets 4 are arranged in a non-uniform distribution, and the ratio of the maximum distance to the minimum distance between the two sound-absorbing sheets 4 is 3:1. The included angle θ between the outer side plates 3 of the sound-absorbing covers on both sides is 60°. The cover plate 5 has a stepped structure, and the rest of the structure is the same as that of Embodiment 1.

[0051] In this embodiment, the sound-absorbing sheets 4 are arranged in a non-uniform distribution to reduce the wind resistance according to the air flow density; due to the smaller opening, the noise reduction effect is better, but the disadvantage is that the wind resistance becomes larger. The stepped cover plate 5 can determine the inner hole size of the cover plate 5 according to the outer diameter of the motor shaft 9 without knowing the size of the user coupling 10. The manufacturing difficulty is not great, but the process is more than that of a circular plate, and it will also cause an increase in wind resistance. Therefore, it is suitable for motors of larger sizes.

[0052] It can be understood that the present utility model is described through some embodiments. Those skilled in the art know that without departing from the spirit and scope of the present utility model, various changes or equivalent replacements can be made to these features and embodiments. Additionally, under the teaching of the present utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present utility model.

Claims

1. A motor air outlet silencer that takes into account bearing cooling, characterized in that: The invention comprises a cover cylinder (1), wherein the cover cylinder (1) is a hollow cylindrical structure with two ends connected therethrough, a side of the cover cylinder (1) is provided with a long strip opening, one end of the cover cylinder (1) is fixedly connected to the end face of a motor base (6), and outer plates (3) are fixedly connected to the two sides of the long strip opening, one end of the outer plates (3) is respectively connected to the long strip opening of the cover cylinder (1), and the other end of the outer plates (3) extends in a direction away from the motor shaft (9), and two parallel end plates (2) are respectively arranged between the two outer plates (3), and the side of the end plates (2) close to the motor shaft (9) is respectively fixedly connected to the outer side face of the cover cylinder (1); an air outlet channel is formed between the end plates (2) and the outer plates (3); The silencer cover is provided with a cover plate (5) in a direction away from the machine base (6), the outer circumference of the cover plate (5) is fixedly connected to the cover cylinder (1), and the inner circumference of the cover plate (5) is clearance-matched with the motor shaft (9) or the coupling (10); a plurality of radially distributed guide plates (11) are provided on the side away from the opening in the cover cylinder (1), there is no gap or a small gap between the guide plates (11) and the cover cylinder (1), and there is a gap between the guide plates (11) and the bearing seat (8); a plurality of silencer plates (4) are provided at the opening of the cover cylinder (1), one end of the silencer plate (4) is nearly flush with the end plate (2) in a direction away from the cover cylinder (1), and the other end of the silencer plate (4) is spaced apart from the bearing seat (8).

2. The motor air outlet silencer with bearing cooling as claimed in claim 1, characterized in that: The arc length of the opening range of the cover tube (1) accounts for 17-50% of the circumference.

3. The motor air outlet silencer with bearing cooling as claimed in claim 1, characterized in that: The angle θ between the outer side plates (3) of the silencer cover on both sides of the opening of the cover cylinder (1) is 0-150°.

4. The motor air outlet silencer with bearing cooling as claimed in claim 1, characterized in that: The cover cylinder (1) is fixedly connected to the machine base (6) via a mounting flange.

5. The motor air outlet silencer with bearing cooling as claimed in claim 1, characterized in that: The cover plate (5) is a petal structure, and the number of petals is 2-8.

6. The motor air outlet silencer with bearing cooling as claimed in claim 1, characterized in that: The cover plate (5) is of an annular, conical or stepped structure.

7. The motor air outlet silencer with bearing cooling as claimed in claim 1, characterized in that: The inner and outer surfaces of the cover tube (1), the cover plate (5), the end plate (2) and the outer plate (3) are paved with a sound-absorbing layer.

8. The motor air outlet silencer with bearing cooling as claimed in claim 1, characterized in that: The noise-absorbing sheets (4) are radially distributed or parallel distributed along the length direction of the end plate (2).

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