Exhaust oil leakage prevention structure for cooling fan

Abstract

The utility model discloses an exhaust oil leakage prevention structure for a cooling fan, which comprises a base, a central sleeve with a groove is arranged on the base, a stator is sleeved on the outer wall of the central sleeve, the groove is step-shaped and is provided with an upper section, a middle section and a lower section, the diameter of the groove is gradually reduced towards the direction of the base, a bearing is arranged in the groove, and an axis for fixing fan blades is arranged in the bearing. The outer diameter of the bearing is matched with the diameter of the middle section of the groove, the height of the bearing is larger than that of the middle section of the groove, the axis of the bearing makes contact with the bottom of the groove, and the top and the bottom of the bearing are provided with a positioning ring and a retaining ring respectively. The middle concave part of the positioning ring abuts against the top of the bearing, a fan-shaped columnar notch is cut in the protruding part on one side of the positioning ring, and the fan-shaped columnar notch and the inner wall of the upper section of the groove define an exhaust hole. The exhaust hole is formed in the position, with the weakest capillary force, of the fan, so that the risk of oil extrusion and leakage caused by air expansion is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of radiating fan, and relates to an exhaust oil leakage prevention structure for radiating fan. BACKGROUND

[0002] In the existing radiating fan structure, the air remaining in the fan will expand due to temperature rise during operation. Since the exhaust port is designed near the central hole of the retaining ring, the gap between this position and the shaft center is limited, and the expanding air will often push the oil upward and accumulate in the upper part of the shaft gap, resulting in oil leakage. This oil leakage not only affects the heat dissipation effect of the fan, but also may cause internal pollution of the fan, affecting the normal operation and service life of the fan. SUMMARY

[0003] In view of the deficiencies of the prior art, the utility model provides an exhaust oil leakage prevention structure for radiating fan, which sets the exhaust hole at the position with the weakest capillary force in the fan structure, instead of the traditional central hole position of the retaining ring. When the gas expands, the remaining air can be preferentially guided out of the exhaust port, thereby avoiding the accumulation of gas in the upper part of the shaft gap and reducing the risk of oil extrusion and leakage caused by air expansion.

[0004] The technical scheme provided by the utility model is as follows:

[0005] The utility model provides an exhaust oil leakage prevention structure for radiating fan, which includes a base, the base is provided with a center sleeve with a groove, the outer wall of the center sleeve is provided with a stator, the groove has three sections of upper, middle and lower sections in a stepped shape and the diameters gradually decrease towards the base, a bearing is arranged in the groove, a shaft center fixed with fan blades is arranged in the bearing, the outer diameter of the bearing matches the diameter of the middle section of the groove and the height is greater than the middle section of the groove, the shaft center is in contact with the bottom of the groove, the top and bottom of the bearing are respectively provided with a positioning ring and a retaining ring, the outer diameter of the positioning ring matches the diameter of the upper section of the groove, the positioning ring is in an inverted concave shape and the top end is flush with the upper end of the center sleeve, the middle concave part of the positioning ring abuts against the top of the bearing, the side protruding part of the positioning ring is cut to form a fan-shaped cylindrical notch, and the fan-shaped cylindrical notch and the inner wall of the upper section of the groove form an exhaust hole.

[0006] Further, the gap between the two side protruding parts of the positioning ring and the bottom of the upper section of the groove is 0.15-0.3mm.

[0007] Further, the maximum transverse distance of the exhaust hole is greater than 0.3mm.

[0008] Further, a wear-resistant sheet is arranged between the shaft center and the bottom of the groove.

[0009] Further, the stator comprises a circuit board, a fixed frame fixedly installed on the circuit board, a silicon steel sheet installed on the fixed frame, a coil wound on the fixed frame and acting on the silicon steel sheet, and the circuit board is electrically connected with the coil.

[0010] Further, the top end of the shaft core is provided with a motor shell, a plurality of fan blades are arranged on the outer side wall of the motor shell, and a magnet is arranged around the coil below the motor shell.

[0011] Further, a grommet is arranged between the bottom of the bearing and the clamping ring, the outer diameter of the grommet is the same as that of the clamping ring, and the inner diameter of the grommet is smaller than that of the clamping ring.

[0012] Further, the outer wall of the center sleeve is in interference fit with the stator.

[0013] Further, the center sleeve is a copper pipe.

[0014] Further, the center sleeve and the base are riveted.

[0015] Beneficial effects

[0016] 1. The exhaust hole is arranged at the position where the capillary force is weakest in the center frame, that is, the cutout area of the positioning ring, so that the residual gas can be discharged through the weak area first, and the oil is prevented from being squeezed out between the clamping ring hole and the shaft core, thereby greatly reducing the oil leakage phenomenon caused by oil escaping.

[0017] 2. The utility model forms an efficient oil storage and exhaust path, because the gap formed by the cutout area and the copper pipe is large, the capillary force is weakened, the oil cannot be taken out when the gas expands, the oil can be left in the bearing and the positioning ring, and external overflow is avoided; when the gas expands, the residual air is discharged from the gap of the cutout area of the positioning ring first, the pressure on the upper part of the shaft core is avoided, and the exhaust path design ensures that the residual gas is discharged quickly and no oil is discharged, thereby improving the working stability of the fan. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is the explosion structure diagram of the utility model;

[0020] Figure 3 It is the structure schematic diagram of the positioning ring (the left side is the appearance diagram of the positioning ring, and the right side is the plan view of the positioning ring).

[0021] Mark explanation: 1, magnet; 2, motor shell; 3, stator; 4, circuit board; 5, center sleeve; 6, bearing; 7, shaft core; 8, positioning ring; 81, fan-shaped columnar cutout; 9, exhaust hole; 10, base. DETAILED DESCRIPTION

[0022] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative in nature and is in no way intended to limit the disclosure, its application or uses, except as described by the appended claims. The present disclosure can be implemented in numerous different forms, as is desired for specific applications; the embodiments provided herein are in no way limiting. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the relative arrangement of components and steps, the numerical expressions, and the numerical values set forth in these embodiments are to be interpreted as merely exemplary, and not as a limitation unless otherwise specifically stated.

[0023] The terms "first", "second", and similar terms used in the present disclosure do not necessarily mean any order, number, or importance, but are used to distinguish different parts. The terms "include", "comprise", and similar terms mean that the elements before the terms encompass the elements listed after the terms, and do not exclude the possibility of also encompassing other elements. "Up", "down", "left", "right", and the like are used only to indicate relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships can also be changed accordingly.

[0024] In the present disclosure, when it is described that a certain device is located between a first device and a second device, there can be an intervening device between the certain device and the first device or the second device, or there can be no intervening device. When it is described that a certain device is connected to other devices, the certain device can be directly connected to the other devices without an intervening device, or can not be directly connected to the other devices with an intervening device.

[0025] All terms used in the present disclosure, including technical or scientific terms, have the same meanings as those understood by those skilled in the art to which the present disclosure pertains, unless otherwise specifically defined. It should also be understood that the terms, such as those defined in a generally used dictionary, should be interpreted to have meanings consistent with those in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless otherwise clearly defined herein.

[0026] Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the specification, if appropriate.

[0027] Example 1

[0028] As Figure 1As shown in the utility model embodiment, the exhaust hole is arranged at the fan-shaped columnar notch cut out by the protruding part of the positioning ring, oil is removed on the exhaust path, so that the expanded gas does not carry out oil during the exhaust process, and the lubrication and oil leakage prevention performance of the fan are ensured.

[0029] The utility model discloses a positioning ring is arranged on the bearing, and the protruding part of the positioning ring is cut out the fan-shaped columnar notch, and the exhaust hole is formed by the fan-shaped columnar notch and the inner wall of the upper section of the recess, so that the oil in the bearing is removed on the exhaust path, and the expanded gas does not carry out oil during the exhaust process, and the lubrication and oil leakage prevention performance of the fan are ensured.

[0030] Embodiment 2

[0031] As Figures 1-3 As shown in the utility model embodiment, the exhaust hole is arranged at the fan-shaped columnar notch cut out by the protruding part of the positioning ring, oil is removed on the exhaust path, so that the expanded gas does not carry out oil during the exhaust process, and the lubrication and oil leakage prevention performance of the fan are ensured.

[0032] In the embodiment, the two sides of the positioning ring 8 are provided with a gap of 0.15-0.3mm from the bottom of the upper section of the recess.

[0033] In the embodiment, the maximum distance of the exhaust hole 9 is greater than 0.3mm.

[0034] Specifically, in order to further weaken the capillary force of the positioning ring cutout area, the circular arc gap of the cutout area is set to be greater than or equal to 0.3 mm, so that the cutout of the outer periphery of the positioning ring forms a new gap with the copper pipe, which is the largest gap in the center frame structure and has the weakest capillary force, and this area becomes the preferential discharge path of the expanded gas, and the outer diameter of the bearing is reduced from φ5.0 to φ4.0, so that more space is reserved for the exhaust port, and the smooth discharge of the gas is ensured, and the overall structural strength and stability of the fan are not affected.

[0035] In the embodiment, a wear-resistant sheet is arranged between the shaft center 7 and the bottom of the groove.

[0036] In the embodiment, the stator 3 comprises a circuit board 4, a fixed frame fixedly installed on the circuit board 4, silicon steel sheets installed on the fixed frame, and coils wound on the fixed frame and acting on the silicon steel sheets, and the circuit board 4 is electrically connected with the coils.

[0037] In the embodiment, the top end of the shaft center 7 is provided with a motor shell 2, the outer side wall of the motor shell 2 is annularly provided with fan blades, and a magnet 1 is fixedly arranged below the motor shell 2 and surrounds the coils.

[0038] In the embodiment, a grommet is further arranged between the bottom of the bearing 6 and the clamping ring, the outer diameter of the grommet is the same as that of the clamping ring, and the inner diameter of the grommet is smaller than that of the clamping ring.

[0039] In the embodiment, the outer wall of the center sleeve 5 is in interference fit with the stator 3.

[0040] In the embodiment, the center sleeve 5 is a copper pipe.

[0041] The utility model forms an efficient oil storage and exhaust path:

[0042] Oil storage: because the gap formed by the cutout area and the copper pipe is large, the capillary force is weakened, and the oil cannot be brought out when the gas expands, so the oil can be left in the inside of the bearing and the positioning ring to avoid spilling out.

[0043] Exhaust: when the gas expands, the residual air will be discharged from the gap of the cutout of the positioning ring first, avoiding the accumulation in the upper part of the shaft center, and the exhaust path design ensures that the residual gas is discharged quickly and no oil is discharged, thereby improving the working stability of the fan.

[0044] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, and are not intended to limit the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can be modified or some technical features can be replaced equivalently without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. An exhaust oil leakage preventing structure for a heat dissipation fan, characterized by comprising: The base is provided with a center sleeve with a groove, the outer wall of the center sleeve is provided with a stator, the groove has three sections of upper, middle and lower sections in a stepped manner and the diameter gradually decreases toward the base, a bearing is arranged in the groove, an axle is arranged in the bearing to fix the fan blade, the outer diameter of the bearing matches the diameter of the middle section of the groove and the height is greater than the middle section of the groove, the axle is in contact with the bottom of the groove, the top and bottom of the bearing are respectively provided with a positioning ring and a buckle ring, the outer diameter of the positioning ring matches the diameter of the upper section of the groove, the positioning ring is in a concave character structure and the top end is flush with the upper end of the center sleeve, the middle concave part of the positioning ring is in contact with the top of the bearing, the side convex part of the positioning ring cuts out a fan-shaped cylindrical notch, and the fan-shaped cylindrical notch and the inner wall of the upper section of the groove form an exhaust hole.

2. The oil leakage preventing structure for the exhaust fan according to claim 1, characterized by, The gap between the two side convex parts of the positioning ring and the bottom of the upper section of the groove is 0.15-0.3mm.

3. The oil leakage preventing structure for the exhaust fan according to claim 1, characterized by, The maximum transverse distance of the exhaust hole is greater than 0.3mm.

4. The oil leakage preventing structure for the exhaust fan according to claim 1, characterized in that, The wear-resistant sheet is arranged between the axle and the bottom of the groove.

5. The oil leakage preventing structure for the exhaust fan according to claim 1, characterized in that, The stator comprises a circuit board, a fixing frame fixedly installed on the circuit board, a silicon steel sheet installed on the fixing frame, a coil wound on the fixing frame and acting on the silicon steel sheet, and the circuit board is electrically connected with the coil.

6. The oil leakage preventing structure for the exhaust fan according to claim 5, wherein The top end of the axle is provided with a motor shell, the outer side wall of the motor shell is provided with a ring of fan blades, and a magnet is arranged below the motor shell and wrapped around the coil.

7. The oil leakage preventing structure for the exhaust fan according to claim 1, characterized by, A grommet is further arranged between the bottom of the bearing and the buckle ring, the outer diameter of the grommet is the same as that of the buckle ring, and the inner diameter is smaller than that of the buckle ring.

8. The oil leakage preventing structure for the exhaust fan according to claim 1, characterized by, The center sleeve is a copper pipe.

9. The oil leakage preventing structure for the exhaust fan according to claim 1, wherein The outer wall of the center sleeve is in interference fit with the stator.

10. The oil leakage preventing structure for the exhaust fan according to claim 1, characterized by, The center sleeve and the base are riveted.

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