Sensor fan capable of reducing noise

Abstract

The utility model discloses a sensor fan capable of reducing noise, and aims to provide a sensor fan capable of effectively increasing the oil quantity of an oil-retaining bearing under the condition that the oil-retaining bearing of the sensor fan has enough use strength, so that the service life of the fan is prolonged, and the problems that the noise is increased and the service life is prolonged due to poor lubrication caused by oil shortage are effectively solved. The utility model discloses a sensor fan capable of reducing noise. A mounting shaft hole is formed in the middle of the base; the motor comprises a rotor, a plurality of blades sequentially distributed in the circumferential direction are fixed to the rotor, and a center shaft is fixed to the center of the rotor; a central shaft of the rotor is rotatably arranged in the mounting shaft hole through the oil bearing, at least one of two end faces of the oil bearing is provided with a plurality of end face oil storage grooves which are uniformly distributed in the circumferential direction, and the distance between any two adjacent end face oil storage grooves which are distributed in the same end face of the oil bearing is larger than or equal to the thickness of the oil bearing.

Description

Technical Field

[0001] The utility model relates to the field of sensor fans, in particular to a sensor fan capable of reducing noise. Background Art

[0002] Sensor fans are used to dissipate heat from sensors and feature a compact, low-profile design. To meet the compact design requirements of sensor fans, the fan blade shaft bearings typically utilize oil-impregnated bearings. Oil-impregnated bearings, also known as porous bearings, are primarily made of metal powder and are sintered bodies manufactured using a powder metallurgy process. When the oil-impregnated bearing is not in operation, its pores are filled with lubricating oil. During operation, the shaft rotates, generating heat due to friction. Thermal expansion of the bearing reduces the pores, causing the lubricating oil to overflow and enter the bearing clearances. When the shaft stops rotating, the bearing cools, the pores recover, and the lubricating oil is drawn back into the pores. While oil-impregnated bearings offer low initial noise, over time, the lubricating oil gradually evaporates, leading to poor lubrication due to lack of oil. This can cause problems such as slower fan speed and increased noise. In severe cases, bearing wear can lead to eccentricity, causing violent vibration and shortening the fan's lifespan. Furthermore, the oil content of an oil-impregnated bearing is closely related to its porosity: higher porosity corresponds to higher oil content. However, increased porosity reduces the bearing's strength. Utility Model Content

[0003] The purpose of the utility model is to provide a sensor fan that can effectively increase the oil volume of the oil-containing bearing while ensuring that the oil-containing bearing of the sensor fan has sufficient strength for use, thereby extending the life of the fan and effectively solving the problem of increased noise caused by lack of oil and poor lubrication, which affects the life of the fan. A sensor fan that can reduce noise.

[0004] The technical solution of the utility model is:

[0005] A sensor fan capable of reducing noise, comprising:

[0006] A base, wherein a mounting shaft hole is provided in the middle of the base;

[0007] The motor includes a rotor having a plurality of blades fixed thereon and distributed in sequence in a circumferential direction, and a central shaft fixed at the center of the rotor;

[0008] The oil-containing bearing, wherein the central axis of the rotor is rotatably arranged in the mounting shaft hole through the oil-containing bearing, and at least one of the two end faces of the oil-containing bearing is provided with a plurality of circumferentially evenly distributed end face oil storage grooves, and the spacing between any two adjacent end face oil storage grooves on the same end face of the oil-containing bearing is greater than or equal to the thickness of the oil-containing bearing. In the oil-containing bearing used in a sensor fan capable of reducing noise in this solution, since any two adjacent end face oil storage grooves on the same end face of the oil-containing bearing are not connected, a structure similar to a reinforcing rib is formed between the two adjacent end face oil storage grooves; and since the spacing between any two adjacent end face oil storage grooves on the same end face of the oil-containing bearing is greater than or equal to the thickness of the oil-containing bearing, the structure between the two adjacent end face oil storage grooves has sufficient supporting strength, thereby ensuring that the oil-containing bearing of the sensor fan has sufficient strength for use. At the same time, since at least one of the two end faces of the oil-containing bearing is provided with a number of end face oil storage grooves evenly distributed in the circumference, the lubricating oil can be stored in these end face oil storage grooves, thereby effectively increasing the oil amount of the oil-containing bearing. During the long-term use of the sensor fan, when the lubricating oil in the pores of the oil-containing bearing evaporates, according to the working principle of the oil-containing bearing, when the central shaft stops rotating, the oil-containing bearing cools, and the pores are restored, the lubricating oil will be sucked back into the pores, thereby sucking the lubricating oil in the end face oil storage groove into the pores of the oil-containing bearing, and the evaporated lubricating oil has been replenished; thereby extending the life of the fan, effectively solving the problems of slow fan speed and increased noise caused by lack of oil and poor lubrication, and severe problems such as violent vibration caused by fan eccentricity due to bearing wear, which affects the life of the fan.

[0009] Preferably, both end surfaces of the oil-containing bearing are equipped with several circumferentially evenly distributed end surface oil reservoirs, with the axial depth of the end surface oil reservoirs being less than or equal to 1 / 3 of the axial length of the oil-containing bearing. Since both end surfaces of the oil-containing bearing are equipped with several circumferentially evenly distributed end surface oil reservoirs, these end surface oil reservoirs can be used to store lubricating oil, further effectively increasing the oil volume of the oil-containing bearing. Furthermore, since the axial depth of the end surface oil reservoirs is less than or equal to 1 / 3 of the axial length of the oil-containing bearing, a solid oil-containing bearing portion without end surface oil reservoirs can be formed in the middle of the oil-containing bearing (the axial center of the oil-containing bearing), further ensuring that the oil-containing bearing of the sensor fan has sufficient strength for use.

[0010] Preferably, the radial spacing between the end surface oil reservoir and the inner wall of the oil-containing bearing is smaller than the radial spacing between the end surface oil reservoir and the outer wall of the oil-containing bearing. By reducing the radial spacing between the end surface oil reservoir and the inner wall of the oil-containing bearing, this solution allows the lubricating oil in the end surface oil reservoir to better replenish the lubricating oil in the pores near the inner wall of the oil-containing bearing, thereby ensuring lubrication between the center shaft and the oil-containing bearing during rotation of the center shaft.

[0011] Preferably, the outer side surface of the oil-containing bearing is provided with one or more circumferentially distributed outer wall grooves. The outer wall grooves extend axially along the oil-containing bearing and penetrate both ends of the oil-containing bearing. A connecting groove is provided on each end surface of the oil-containing bearing. The connecting groove connects the inner and outer walls of the oil-containing bearing, and one end of the connecting groove is connected to one of the outer wall grooves. This allows the outer wall grooves and the connecting grooves to form a round-trip route for oil flow. Furthermore, it facilitates airflow through the outer wall grooves, thereby dissipating heat.

[0012] Preferably, a retaining ring is further provided in the mounting shaft hole, the retaining ring being located between the orifice of the mounting shaft hole and the oil-containing bearing, an annular groove cooperating with the retaining ring is provided on the outer surface of the central shaft, the inner edge of the retaining ring extending into the annular groove, a washer is further provided between the retaining ring and the oil-containing bearing, and the inner diameter of the washer is smaller than the inner diameter of the oil-containing bearing, and the gap between the inner edge of the washer and the central shaft forms an oil storage chamber. This solution restricts the central shaft from slipping out of the oil-containing bearing by cooperating with the annular groove of the central shaft, thereby preventing the rotor from slipping out; at the same time, a washer is provided between the retaining ring and the oil-containing bearing, and the inner diameter of the washer is smaller than the inner diameter of the oil-containing bearing, thereby forming an oil storage chamber in the gap between the inner edge of the washer and the central shaft, further increasing the oil storage space.

[0013] Preferably, the motor further comprises a stator, which is fixed to the base. The stator comprises a stator frame, which includes a central baffle that blocks the opening of the mounting shaft hole. A central shaft through-hole is provided in the center of the central baffle, through which the central shaft passes. The retaining ring and the oil-containing bearing are located on the same side of the central baffle, and the central baffle retains the retaining ring within the mounting shaft hole. This solution utilizes the stator's central baffle to confine the retaining ring, washer, and oil-containing bearing within the mounting shaft hole, thereby restraining the central shaft and preventing the rotor from dislodging. This eliminates the need for a retaining ring structure within the mounting shaft hole (e.g., a slot within the mounting shaft hole to retain the retaining ring), thereby simplifying the structure and facilitating retaining ring installation and base fabrication.

[0014] Preferably, a wear-resistant washer is provided at the bottom end of the mounting shaft hole, and the end of the central shaft is close to or against the wear-resistant washer. This prevents the end of the central shaft from contacting the bottom of the mounting shaft hole, and the wear-resistant washer limits the central shaft and provides wear resistance, thereby extending the life of the fan.

[0015] Preferably, the end of the central shaft is provided with a spherical protrusion, which is close to or against the wear-resistant pad. In this way, the contact area between the end of the central shaft and the wear-resistant pad can be effectively reduced, friction can be reduced, and the life of the fan can be further extended.

[0016] Preferably, the base further comprises an upper cover, and the base comprises a bottom plate and side panels. The space enclosed by the bottom plate and side panels of the base forms a base groove opening toward the upper cover. The upper cover is mounted on the side panels and blocks the opening of the base groove. The motor is located within the base groove. In this way, the motor and blades can be protected by the base and the upper cover.

[0017] Preferably, a sleeve is provided in the middle of the base plate, projecting toward the upper cover. The inner hole of the sleeve forms the mounting shaft hole. This allows the sleeve to be accommodated in the base groove of the base, further improving the compactness of the sensor fan and reducing the space occupied by the sensor fan in the axial direction of the central axis.

[0018] The beneficial effect of the utility model is that it can effectively increase the oil volume of the oil-containing bearing while ensuring that the oil-containing bearing of the sensor fan has sufficient usage strength, thereby extending the life of the fan and effectively solving the problem of increased noise caused by lack of oil and poor lubrication, which affects the life of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is an exploded diagram of a sensor fan capable of reducing noise.

[0020] Figure 2 The utility model is a schematic diagram of a cross-sectional structure of a sensor fan capable of reducing noise.

[0021] Figure 3 The utility model is a three-dimensional structural schematic diagram of an oil-containing bearing of a sensor fan capable of reducing noise.

[0022] In the picture:

[0023] Base 1, mounting shaft hole 1.0, bottom plate 1.1, side panel 1.2, base groove 1.3, shaft sleeve 1.4;

[0024] Upper cover 2;

[0025] Rotor 3, blades 3.1, central axis 3.2, annular groove 3.3, spherical protrusion 3.4;

[0026] Stator 4, center baffle 4.1;

[0027] Oil-containing bearing 5, end surface oil storage groove 5.1, outer wall groove 5.2, connecting groove 5.3;

[0028] Buckle 6;

[0029] Washer 7;

[0030] Wear-resistant gasket 8. DETAILED DESCRIPTION

[0031] Specific embodiment 1, as Figure 1 、 Figure 2 、 Figure 3As shown, a sensor fan capable of reducing noise includes a base 1, a motor and an oil-containing bearing 5. A mounting shaft hole 1.0 is provided in the middle of the base 1. The motor includes a rotor 3. A plurality of blades 3.1 distributed circumferentially are fixed to the rotor 3. A central shaft 3.2 is fixed to the center of the rotor 3. The central shaft 3.2 of the rotor 3 is rotatably set in the mounting shaft hole 1.0 through the oil-containing bearing 5. The oil-containing bearing 5 is set in the mounting shaft hole 1.0. The central shaft 3.2 is rotatably set in the inner hole of the oil-containing bearing 5. At least one of the two end faces of the oil-containing bearing 5 is provided with a plurality of end face oil storage grooves 5.1 uniformly distributed circumferentially. The distance between any two adjacent end face oil storage grooves 5.1 on the same end face of the oil-containing bearing 5 is greater than or equal to the thickness of the oil-containing bearing 5.

[0032] In the oil-containing bearing 5 used in a noise-reducing sensor fan of the present embodiment, since any two adjacent end surface oil storage grooves 5.1 on the same end surface of the oil-containing bearing 5 are not connected, a structure similar to a reinforcing rib is formed between the two adjacent end surface oil storage grooves 5.1; and since the spacing between any two adjacent end surface oil storage grooves 5.1 on the same end surface of the oil-containing bearing 5 is greater than or equal to the thickness of the oil-containing bearing 5, the structure between any two adjacent end surface oil storage grooves 5.1 has sufficient supporting strength, thereby ensuring that the oil-containing bearing 5 of the sensor fan has sufficient strength for use. At the same time, since at least one of the two end faces of the oil-containing bearing 5 is provided with a plurality of circumferentially evenly distributed end face oil storage grooves 5.1, lubricating oil can be stored in these end face oil storage grooves 5.1, thereby effectively increasing the oil amount of the oil-containing bearing 5. During the long-term use of the sensor fan, when the lubricating oil in the pores of the oil-containing bearing 5 evaporates, according to the working principle of the oil-containing bearing 5, when the central shaft 3.2 stops rotating, the oil-containing bearing 5 cools, and the pores are restored, the lubricating oil will be sucked back into the pores, thereby sucking the lubricating oil in the end face oil storage grooves 5.1 into the pores of the oil-containing bearing 5, and the evaporated lubricating oil has been replenished; thereby extending the life of the fan, effectively solving the problems of slow fan speed and increased noise caused by lack of oil and poor lubrication, and severe problems such as fan eccentricity caused by bearing wear, causing violent vibration, affecting the life of the fan.

[0033] Furthermore, providing the end surface oil reservoir 5.1 on the end surface of the oil-containing bearing 5 facilitates the actual processing and manufacturing of the end surface oil reservoir 5.1. For example, the end surface oil reservoir 5.1 can be machined on the end surface of the oil-containing bearing 5, or the end surface oil reservoir 5.1 can be directly formed during the manufacturing process of the oil-containing bearing 5.

[0034] Specific embodiment 2, as Figure 1 、 Figure 2 、 Figure 3As shown, a noise-reducing sensor fan includes a base 1, a motor, and an oil-containing bearing 5. A mounting shaft hole 1.0 is defined in the center of the base 1. The motor includes a rotor 3. Several blades 3.1 are fixed to the rotor 3 and arranged in a circumferential pattern. A central shaft 3.2 is fixed to the center of the rotor 3. The central shaft 3.2 of the rotor 3 is rotatably mounted within the mounting shaft hole 1.0 via the oil-containing bearing 5. The oil-containing bearing 5 is disposed within the mounting shaft hole 1.0. The central shaft 3.2 is rotatably mounted within the inner bore of the oil-containing bearing 5.

[0035] At least one of the two end faces of the oil-containing bearing 5 is provided with a plurality of circumferentially evenly distributed end face oil storage grooves 5.1. The number of end face oil storage grooves 5.1 is set according to actual needs, for example, the number of end face oil storage grooves 5.1 is 2, 3, 4, 5, 6, or more. In this embodiment, the number of end face oil storage grooves 5.1 is 4. The spacing between any two adjacent end face oil storage grooves 5.1 on the same end face of the oil-containing bearing 5 is greater than or equal to the thickness of the oil-containing bearing 5. Because any two adjacent end face oil storage grooves 5.1 on the same end face of the oil-containing bearing 5 are not connected, a structure similar to a reinforcing rib is formed between any two adjacent end face oil storage grooves 5.1. Moreover, because the spacing between any two adjacent end face oil storage grooves 5.1 on the same end face of the oil-containing bearing 5 is greater than or equal to the thickness of the oil-containing bearing 5, the structure between any two adjacent end face oil storage grooves 5.1 has sufficient support strength, thereby ensuring that the oil-containing bearing 5 of the sensor fan has sufficient strength for use.

[0036] In one embodiment, Figure 2 As shown, both end surfaces of the oil-containing bearing 5 are provided with a number of circumferentially evenly distributed end surface oil reservoirs 5.1. In this embodiment, the axial depth of the end surface oil reservoirs 5.1 is less than or equal to 1 / 3 of the axial length of the oil-containing bearing 5. Because the oil-containing bearing 5 is provided with a number of circumferentially evenly distributed end surface oil reservoirs 5.1, these end surface oil reservoirs 5.1 can store lubricating oil, further effectively increasing the oil volume of the oil-containing bearing 5. Furthermore, because the axial depth of the end surface oil reservoirs 5.1 is less than or equal to 1 / 3 of the axial length of the oil-containing bearing 5, a solid portion of the oil-containing bearing 5 without end surface oil reservoirs 5.1 can be formed in the middle portion of the oil-containing bearing 5 (the axial center of the oil-containing bearing 5), further ensuring that the oil-containing bearing 5 of the sensor fan has sufficient strength for use.

[0037] In another embodiment, only one of the two end faces of the oil-containing bearing 5 is provided with a plurality of circumferentially evenly distributed end face oil reservoirs 5.1. In this embodiment, the axial depth of the end face oil reservoirs 5.1 is less than or equal to 1 / 2 of the axial length of the oil-containing bearing 5. Because one of the two end faces of the oil-containing bearing 5 is provided with a plurality of circumferentially evenly distributed end face oil reservoirs 5.1, these end face oil reservoirs 5.1 can store lubricating oil, effectively increasing the oil volume of the oil-containing bearing 5. At the same time, because the axial depth of the end face oil reservoirs 5.1 is less than or equal to 1 / 2 of the axial length of the oil-containing bearing 5, the portion of the oil-containing bearing 5 near the end without the end face oil reservoirs 5.1 can be a solid oil-containing bearing 5, further ensuring that the oil-containing bearing 5 of the sensor fan has sufficient strength for use.

[0038] During long-term use of the noise-reducing sensor fan of this embodiment, when the lubricating oil in the pores of the oil-containing bearing 5 evaporates, according to the working principle of the oil-containing bearing 5, when the central shaft 3.2 stops rotating, the oil-containing bearing 5 cools, and the pores are restored, the lubricating oil will be sucked back into the pores, thereby sucking the lubricating oil in the end face oil storage tank 5.1 into the pores of the oil-containing bearing 5, and the evaporated lubricating oil has been replenished; thereby extending the life of the fan, and effectively solving the problems of slow fan speed and increased noise caused by lack of oil and poor lubrication, and the problem that in severe cases, the fan eccentricity caused by bearing wear will cause violent vibration, affecting the life of the fan.

[0039] Furthermore, providing the end surface oil reservoir 5.1 on the end surface of the oil-containing bearing 5 facilitates the actual processing and manufacturing of the end surface oil reservoir 5.1. For example, the end surface oil reservoir 5.1 can be machined on the end surface of the oil-containing bearing 5, or the end surface oil reservoir 5.1 can be directly formed during the manufacturing process of the oil-containing bearing 5.

[0040] Specifically, such as Figure 1 、 Figure 2 As shown, a sensor fan capable of reducing noise also includes an upper cover 2. The base 1 includes a bottom plate 1.1 and a side panel 1.2. The space enclosed by the bottom plate 1.1 and the side panel 1.2 of the base 1 constitutes a base groove 1.3 with an opening toward the upper cover 2. The upper cover 2 is mounted on the side panel 1.2 and blocks the opening of the base groove 1.3. In this embodiment, the upper cover 2 is mounted on the side panel 1.2 by bolts. Of course, the upper cover 2 can also be mounted on the side panel 1.2 by means of snaps or rivets. The motor and the blades 3.1 are located in the base groove 1.3. In this way, the motor and the blades 3.1 can be protected by the base 1 and the upper cover 2.

[0041] The motor also includes a stator 4. The stator 4 is fixed to the base 1. In this embodiment, the motor rotor 3 is an outer rotor. The blades 3.1 and the rotor 3 frame are integrally formed. This facilitates the actual production of the blades 3.1 and the rotor 3 frame, reduces the number of parts, reduces the number of molds, and reduces production costs. Of course, it should be noted that the blades 3.1 and the rotor 3 frame can also be produced separately, and then the blades 3.1 can be connected to the rotor 3 frame by bolts, rivets, welding, etc.

[0042] In this embodiment, no grooves or holes are provided on the inner side surface of the inner hole of the oil-containing bearing 5. The inner side surface of the inner hole of the oil-containing bearing 5 is a smooth and complete cylindrical surface. In this way, the smoothness of the inner side surface of the inner hole of the oil-containing bearing 5 can be improved, and the friction coefficient can be reduced, thereby further reducing the friction between the oil-containing bearing 5 and the central shaft 3.2.

[0043] Further, such as Figure 1 、 Figure 2 As shown, a sleeve 1.4 is provided in the middle of base plate 1.1, projecting toward upper cover 2. The inner hole of sleeve 1.4 forms the aforementioned mounting shaft hole 1.0. Sleeve 1.4 and base plate 1.1 are integrally formed. This allows the base groove 1.3 of base 1 to accommodate sleeve 1.4, further improving the compactness of the sensor fan and reducing the space occupied by the sensor fan in the axial direction of central axis 3.2.

[0044] Further, such as Figure 1 、 Figure 2 As shown, a retaining ring 6 is also provided in the mounting shaft hole 1.0. The retaining ring 6 is located between the orifice of the mounting shaft hole 1.0 and the oil-containing bearing 5. An annular groove 3.3 that cooperates with the retaining ring 6 is provided on the outer surface of the center shaft 3.2, and the inner edge of the retaining ring 6 extends into the annular groove 3.3. A washer 7 is also provided between the retaining ring 6 and the oil-containing bearing 5. The inner diameter of the washer 7 is smaller than the inner diameter of the oil-containing bearing 5. The gap between the inner edge of the washer 7 and the center shaft 3.2 forms an oil storage chamber. In this way, the retaining ring 6 can be used to cooperate with the annular groove 3.3 of the center shaft 3.2 to limit the center shaft 3.2 from slipping out of the oil-containing bearing 5, thereby preventing the rotor 3 from slipping out. At the same time, a washer 7 is provided between the retaining ring 6 and the oil-containing bearing 5. The inner diameter of the washer 7 is smaller than the inner diameter of the oil-containing bearing 5. Thus, an oil storage chamber is formed in the gap between the inner edge of the washer 7 and the center shaft 3.2, further increasing the oil storage space.

[0045] Further, such as Figure 2As shown, the stator 4 includes a stator frame. The stator frame includes a center baffle 4.1 that blocks the opening of the mounting shaft hole 1.0. A through hole for the center shaft 3.2 is provided in the middle of the center baffle 4.1, and the center shaft 3.2 passes through the through hole for the center shaft 3.2. The retaining ring 6 and the oil-containing bearing 5 are located on the same side of the center baffle 4.1, and the center baffle 4.1 blocks the retaining ring 6 in the mounting shaft hole 1.0. This solution uses the center baffle 4.1 of the stator 4 to restrict the retaining ring 6, the washer 7 and the oil-containing bearing 5 in the mounting shaft hole 1.0 to restrict the center shaft 3.2 and prevent the rotor 3 from falling out; in this way, there is no need to set a structure for limiting the retaining ring 6 in the mounting shaft hole 1.0 (for example, setting a slot in the mounting shaft hole 1.0 to limit the retaining ring 6), which is conducive to simplifying the structure and facilitating the installation of the retaining ring 6 and the production of the base 1.

[0046] Further, such as Figure 1 、 Figure 2 As shown, a wear-resistant washer 8 is provided at the bottom end of the mounting shaft hole 1.0, and the end of the central shaft 3.2 is close to or against the wear-resistant washer 8. This prevents the end of the central shaft 3.2 from contacting the bottom of the mounting shaft hole 1.0. The wear-resistant washer 8 limits the central shaft 3.2 and provides a wear-resistant effect, thereby extending the life of the fan.

[0047] Further, such as Figure 2 As shown, the end of the central shaft 3.2 is provided with a spherical protrusion 3.4, which is close to or against the wear-resistant pad 8. In this way, the contact area between the end of the central shaft 3.2 and the wear-resistant pad 8 can be effectively reduced, reducing friction and further extending the life of the fan.

[0048] Further, such as Figure 3 As shown, the outer side surface of the oil-containing bearing 5 is provided with one or more outer wall grooves 5.2 distributed sequentially along the circumference. In this embodiment, the outer side surface of the oil-containing bearing 5 is provided with 2-6 outer wall grooves 5.2 distributed sequentially along the circumference. The outer wall grooves 5.2 extend axially along the oil-containing bearing 5 and penetrate both ends of the oil-containing bearing 5. A connecting groove 5.3 is provided on each end surface of the oil-containing bearing 5. The connecting groove 5.3 connects the inner and outer walls of the oil-containing bearing 5, and one end of the connecting groove 5.3 is connected to one of the outer wall grooves 5.2. This creates a round-trip route for oil flow through the outer wall grooves 5.2 and the connecting grooves 5.3. Furthermore, it facilitates airflow through the outer wall grooves 5.2, dissipating heat.

[0049] Specific embodiment 3: The rest of the structure of this embodiment refers to specific embodiment 1 or specific embodiment 2, the difference is that:

[0050] In one embodiment, the radial spacing between the end surface oil reservoir 5.1 and the inner wall of the oil-containing bearing 5 is smaller than the radial spacing between the end surface oil reservoir 5.1 and the outer wall of the oil-containing bearing 5. In this embodiment, by reducing the radial spacing between the end surface oil reservoir 5.1 and the inner wall of the oil-containing bearing 5, the lubricating oil in the end surface oil reservoir 5.1 can better replenish the lubricating oil in the pores near the inner wall of the oil-containing bearing 5, thereby ensuring lubrication between the central shaft 3.2 and the oil-containing bearing 5 during rotation of the central shaft 3.2.

[0051] In another embodiment, the radial distance between the end surface oil reservoir 5.1 and the inner wall of the oil-containing bearing 5 is greater than the radial distance between the end surface oil reservoir 5.1 and the outer wall of the oil-containing bearing 5.

[0052] In the third embodiment, the radial distance between the end surface oil storage groove 5 . 1 and the inner wall of the oil-containing bearing 5 is the same as the radial distance between the end surface oil storage groove 5 . 1 and the outer wall of the oil-containing bearing 5 .

[0053] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent transformation of the above embodiment based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A sensor fan capable of reducing noise, characterized in that: include: Base, with a mounting shaft hole provided in the middle of the base; The motor includes a rotor having a plurality of blades fixed thereon and distributed in sequence in a circumferential direction, and a central shaft fixed at the center of the rotor; An oil-containing bearing, wherein the central axis of the rotor is rotatably disposed in the mounting shaft hole through the oil-containing bearing, and at least one of the two end faces of the oil-containing bearing is provided with a plurality of end face oil storage grooves evenly distributed in the circumferential direction, and the spacing between any two adjacent end face oil storage grooves on the same end face of the oil-containing bearing is greater than or equal to the thickness of the oil-containing bearing; The outer side surface of the oil-containing bearing is provided with one or more outer wall grooves distributed in sequence in the circumferential direction. The outer wall grooves extend along the axial direction of the oil-containing bearing and pass through both ends of the oil-containing bearing. Connecting grooves are provided on both end surfaces of the oil-containing bearing. The connecting grooves connect the inner and outer side walls of the oil-containing bearing, and one end is connected to one of the outer wall grooves.

2. A noise-reducing sensor fan according to claim 1, characterized in that: Both end faces of the oil-containing bearing are provided with a plurality of end face oil storage grooves evenly distributed in the circumferential direction, and the axial depth of the end face oil storage groove is less than or equal to 1 / 3 of the axial length of the oil-containing bearing.

3. The noise-reducing sensor fan according to claim 1, wherein: The radial distance between the end surface oil storage groove and the inner wall of the oil-containing bearing is smaller than the radial distance between the end surface oil storage groove and the outer wall of the oil-containing bearing.

4. A noise-reducing sensor fan according to claim 1, 2 or 3, characterized in that: A retaining ring is also provided in the mounting shaft hole, and the retaining ring is located between the hole opening of the mounting shaft hole and the oil-containing bearing. An annular groove cooperating with the retaining ring is provided on the outer surface of the central shaft, and the inner edge of the retaining ring extends into the annular groove. A washer is also provided between the retaining ring and the oil-containing bearing, and the inner diameter of the washer is smaller than the inner diameter of the oil-containing bearing. The gap between the inner edge of the washer and the central shaft forms an oil storage cavity.

5. The noise-reducing sensor fan according to claim 4, wherein: The motor also includes a stator, which is fixed on the base. The stator includes a stator frame, and the stator frame includes a central baffle that blocks the opening of the mounting shaft hole. A central shaft through-hole is provided in the middle of the central baffle, and the central shaft passes through the central shaft through-hole. The retaining ring and the oil-containing bearing are located on the same side of the central baffle, and the central baffle blocks the retaining ring in the mounting shaft hole.

6. A noise-reducing sensor fan according to claim 1, 2 or 3, characterized in that: A wear-resistant gasket is provided at the bottom end of the mounting shaft hole, and the end of the central shaft is close to or against the wear-resistant gasket.

7. A noise-reducing sensor fan according to claim 6, characterized in that: A spherical protrusion is provided at the end of the central shaft, and the spherical protrusion is close to or against the wear-resistant gasket.

8. A noise-reducing sensor fan according to claim 1, 2 or 3, characterized in that: It also includes an upper cover, and the base includes a bottom plate and side panels. The space enclosed by the bottom plate and the side panels of the base constitutes a base groove with an opening toward the upper cover. The upper cover is installed on the side panels and covers the opening of the base groove. The motor is located in the base groove.

9. The noise-reducing sensor fan according to claim 8, wherein: A shaft sleeve protruding toward the upper cover is provided in the middle of the bottom plate, and the inner hole of the shaft sleeve constitutes the mounting shaft hole.

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