CN221003237U - Sealing structure for high-speed fan - Google Patents

Abstract

The disclosure provides a sealing structure for a high-speed fan, relates to the technical field of high-speed fans, and aims to solve the problems of poor sealing performance of gaps in the high-speed fan in the related art. The sealing structure design comprises a motor main shaft and a motor back plate, wherein the output end of the motor main shaft penetrates out of the motor back plate and is connected with the impeller, and the motor main shaft is configured to drive the impeller to rotate; the impeller and the motor back plate are provided with a first labyrinth sealing structure, and the sealing structure comprises a plurality of groups of first circular ring bosses positioned on one side of the impeller close to the motor back plate and a plurality of groups of second circular ring bosses positioned on one side of the motor back plate close to the impeller. The plurality of groups of first circular boss and the plurality of groups of second circular boss are distributed at equal intervals and are coaxially arranged with the motor spindle; along the direction close to the axis of the motor spindle, a plurality of groups of first circular ring bosses and a plurality of groups of second circular ring bosses are alternately arranged in sequence. The sealing structure is suitable for a centrifugal high-speed fan.

Description

Sealing structure for high-speed fan

Technical Field

The disclosure relates to the technical field of high-speed fans, in particular to a sealing structure for a high-speed fan.

Background

High-speed centrifugal blowers are favored by more and more industries because of the advantages of high efficiency, high single-machine pressure ratio, compact structure and the like. In general, a radial clearance exists between a main shaft and a bearing of the high-speed fan and between an impeller and a motor mounting plate, so that the problems of gas leakage, pressure loss, efficiency reduction and the like of the high-speed fan are caused.

In order to avoid the problems, the high-speed fan in the prior art adopts an axial gap sealing method between the main shaft and the motor, and the sealing structure is positioned inside the motor and can not effectively block the gas-liquid channeling problem between the normal pressure cavity and the normal pressure cavity. Meanwhile, the axial gap sealing structure easily causes that lubricating grease in the bearing is pumped away, so that the lubrication of the bearing is influenced, and the service life of the high-speed fan is further influenced.

Disclosure of Invention

An object of the present disclosure is to provide a sealing structure for a high-speed fan, which is used for at least improving the problems of poor sealing performance of a gap in the high-speed fan in the related art.

In order to achieve the above object, the present disclosure provides the following technical solutions:

The utility model provides a seal structure for high-speed fan, it includes motor main shaft and motor backplate, the output of motor main shaft wears out the motor backplate and is connected with the impeller, the motor main shaft is configured to drive the impeller rotates; a first labyrinth seal structure is arranged between the impeller and the motor back plate, and comprises a plurality of groups of first annular bosses positioned on one side of the impeller close to the motor back plate and a plurality of groups of second annular bosses positioned on one side of the motor back plate close to the impeller; the first annular bosses and the second annular bosses are arranged at equal intervals and are sequentially and alternately arranged along the direction close to the axis of the motor spindle; the plurality of groups of first circular boss and the plurality of groups of second circular boss are coaxially arranged with the motor spindle.

In some embodiments, one second annular boss and one adjacent first annular boss form a concave-convex table set in which a gap between the first annular boss and the motor back plate and a gap between the second annular boss and the impeller are smaller than a gap between the second annular boss and the first annular boss.

In some embodiments, in the concave-convex table group, a gap between the second circular ring boss and the first circular ring boss on a side close to the motor back plate is larger than a gap between the second circular ring boss and the first circular ring boss on a side far from the motor back plate, and a gap between two adjacent concave-convex table groups on a side close to the motor back plate is smaller than a gap between two adjacent concave-convex table groups on a side far from the motor back plate; or in the concave-convex table group, the gap between the second circular ring boss and the first circular ring boss at one side close to the motor back plate is smaller than the gap between the second circular ring boss and the first circular ring boss at one side far away from the motor back plate, and the gap between two adjacent concave-convex table groups at one side close to the motor back plate is larger than the gap between two adjacent concave-convex table groups at one side far away from the motor back plate.

In some embodiments, the motor main shaft is connected with the motor back plate through a bearing, and an axial sheath is further arranged on one side of the bearing, which is close to the output end of the motor main shaft, and the axial sheath is coaxially arranged with the motor main shaft; the axial sheath is also sleeved with an axial sealing ring, and the axial sealing ring is fixed on the motor backboard.

In some embodiments, a second labyrinth seal structure is provided between the axial jacket and the axial seal ring.

In some embodiments, the second labyrinth seal structure includes a first duct, a second duct, and a third duct disposed in sequential communication between the axial jacket and the axial seal ring, the first duct and the third duct being disposed along a length direction of the motor spindle, the second duct being disposed along a radial direction of the motor spindle.

In some embodiments, the axial jacket is secured to the motor spindle by an interference fit.

In some embodiments, a sealing end cover is further arranged on one side of the axial sealing ring, which is close to the output end of the motor spindle, and the output end of the motor spindle penetrates out of the sealing end cover; the sealing end cover is fixed on the motor backboard, and an elastic sealing ring is further arranged between the sealing end cover and the motor backboard.

In some embodiments, a third labyrinth seal is provided between the seal end cap and the motor spindle.

In some embodiments, the third labyrinth seal structure includes a plurality of toothed rings located on the seal end cover and near one side of the motor spindle, wherein the plurality of toothed rings are coaxially arranged with the motor spindle, and the plurality of toothed rings are sequentially arranged along the length direction of the motor spindle.

The beneficial effects are that:

According to the motor back plate, gaps between the impellers and the motor back plate are filled through the first annular bosses and the second annular bosses, and the gaps are greatly reduced. Meanwhile, a plurality of groups of first circular ring bosses and a plurality of groups of second circular ring bosses are arranged in a staggered mode, one group of first circular ring bosses can fill gaps between two groups of second circular ring bosses adjacent to the first circular ring bosses, and one group of second circular ring bosses can fill gaps between two groups of first circular ring bosses adjacent to the second circular ring bosses, so that the gaps between the impeller and the motor back plate are further reduced. In addition, because the gaps between the impellers and the motor back plate are separated into more and smaller gaps by the first circular ring bosses and the second circular ring bosses, the separation and throttling effects of the circular ring bosses are utilized, so that a particularly good sealing effect is achieved between the impellers and the motor back plate.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings that are required to be used in the embodiments will be briefly described below. It is appreciated that the following drawings depict only certain embodiments of the disclosure and are therefore not to be considered limiting of its scope. Other relevant drawings may be made by those of ordinary skill in the art without undue burden from these drawings.

FIG. 1 is a cross-sectional view of a seal structure for a high speed fan according to some embodiments of the present disclosure;

FIG. 2 is an enlarged view of area A of FIG. 1;

FIG. 3 is a cross-sectional view of a seal structure for a high speed fan according to further embodiments of the present disclosure;

fig. 4 is an enlarged structural view of the region B in fig. 3.

Reference numerals:

1-an elastic sealing ring; 2-sealing end caps; 3-an axial sealing ring; 4-an axial sheath; 5-a motor spindle; 7-a motor back plate; 8-bearing; 9-an impeller; 201-a toothed ring; 202-blocking the gap; 401-a second labyrinth seal structure; 702-a second annular boss; 902-a first annular boss; 903—throttle gap; 904-expanding the cavity.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present disclosure. The components of the embodiments of the present disclosure, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present disclosure provided in the accompanying drawings is not intended to limit the scope of the disclosure, as claimed, but is merely representative of selected embodiments of the disclosure. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, based on the embodiments in this disclosure are intended to be within the scope of this disclosure.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present specification, the terms "some embodiments," "some examples," or "exemplary" and the like are intended to indicate that a particular feature, structure, material, or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

In the description of the present disclosure, it should be understood that the azimuth or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc., are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship conventionally put in use of the application product, or the azimuth or positional relationship conventionally understood by those skilled in the art, are merely for convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the apparatus or element to be referred must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present disclosure.

Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance. The term "a and/or B" includes the following combinations: only a, only B, or a and B. In the description of this disclosure, relative rotation of C and D may refer to C being stationary and D being rotating, or C being rotating and D being stationary.

In the description of the present disclosure, it should also be noted that, unless explicitly specified and limited otherwise, terms such as "disposed," "connected," and the like are to be construed broadly and, for example, "connected" may be either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. In addition, "fixed" may be directly connected or indirectly fixed through an intermediate medium. The specific meaning of the terms in this disclosure will be understood by those of ordinary skill in the art as the case may be.

Some embodiments of the present disclosure provide a sealing structure for a high-speed fan, please participate in fig. 1 and 3, which includes a motor spindle 5 and a motor back plate 7. The output end of the motor main shaft 5 penetrates through the motor back plate 7 and is connected with the impeller 9, the motor main shaft 5 can rotate, and the motor main shaft 5 is configured to drive the impeller 9 to rotate.

Referring to fig. 3 and 4, a first labyrinth seal is provided between the impeller 9 and the motor backplate 7. The first labyrinth seal structure includes a plurality of sets of first annular lands 902 on the side of the impeller 9 adjacent the motor backplate 7, and a plurality of sets of second annular lands 702 on the side of the motor backplate 7 adjacent the impeller 9. Wherein, the plurality of groups of first circular boss 902 and the plurality of groups of second circular boss 702 are arranged at equal intervals, and along the direction close to the axis 5 of the motor spindle, the plurality of groups of first circular boss 902 and the plurality of groups of second circular boss 702 are alternately arranged in sequence; the plurality of first annular bosses 902 and the plurality of second annular bosses 702 are disposed coaxially with the motor spindle 5.

So arranged, the plurality of sets of first circular bosses 902 and the plurality of sets of second circular bosses 702 fill the gap between the impeller 9 and the motor backplate 7, so that the gap is greatly reduced. Meanwhile, a plurality of groups of first circular ring bosses 902 and a plurality of groups of second circular ring bosses 702 are utilized for staggered arrangement, a group of first circular ring bosses 902 can fill gaps between two groups of second circular ring bosses 702 adjacent to the first circular ring bosses, and a group of second circular ring bosses 702 can fill gaps between two groups of first circular ring bosses 902 adjacent to the second circular ring bosses, so that the gaps between the impeller 9 and the motor back plate 7 are further reduced. In addition, the gaps between the impeller 9 and the motor back plate 7 are separated into more and smaller gaps by the plurality of groups of first annular bosses 902 and the plurality of groups of second annular bosses 702, and the baffle and the throttling function of the annular bosses are utilized, so that a particularly good sealing effect is achieved between the impeller 9 and the motor back plate 7.

In some examples, the number of sets of first annular lands 902 is 4 or more, which may provide a good seal.

In some examples, the number of sets of second annular lands 702 is adapted to the number of sets of first annular lands 902. For example, when the number of the groups of the first annular bosses 902 is 4, the number of the groups of the second annular bosses 702 may be 4, so that gaps between two adjacent groups of the first annular bosses 902 may be filled, and gaps between two adjacent groups of the second annular bosses 702 may be effectively filled, thereby making the overall sealing performance better.

In some embodiments, as shown in fig. 4, one second annular boss 702 and one adjacent first annular boss 902 form a concave-convex stage group in which the gap between the first annular boss 902 and the motor back plate 7 and the gap between the second annular boss 702 and the impeller 9 are smaller than the gap between the second annular boss 702 and the first annular boss 902. In this way, the gap between the first circular boss 902 and the motor back plate 7 and the gap between the second circular boss 702 and the impeller 9 are both throttling gaps, and the gap between the second circular boss 702 and the first circular boss 902 is an expansion cavity, so that a throttling effect can be generated when fluid passes through the gap in the concave-convex table set, pressure energy is converted into kinetic energy when the fluid passes through the throttling gap, and the kinetic energy is converted into heat energy when the fluid passes through the expansion cavity, thereby realizing kinetic energy dissipation and reducing fluid leakage, and the first labyrinth seal structure has a very good sealing effect.

In some examples, the gap between the second annular boss 702 and the first annular boss 902 on the side closer to the motor backplate 7 is greater than or less than the gap between the second annular boss 702 and the first annular boss 902 on the side farther from the motor backplate 7. The loss of fluid kinetic energy can be further exacerbated by making the gaps at the ends of the relief table sets different. In particular, such that the smaller gap will be the throttle gap 903 and the relatively larger gap will be the expansion cavity 904 between the ends. Thus, when the fluid passes through the throttling gap 903, the pressure energy is converted into kinetic energy, and when the fluid passes through the expansion cavity 904, the kinetic energy is converted into heat energy, so that the kinetic energy dissipation is realized, the leakage amount of the fluid is reduced, and the radial sealing is realized.

In some examples, the cross-sectional shape of the second annular boss 702 may be a right trapezoid, which may facilitate the formation of the throttle gap 903 and the expansion cavity 904 described above. Similarly, the cross-sectional shape of the first annular boss 902 may also be right trapezoid, which may facilitate the formation of the throttle gap 903 and the expansion cavity 904 described above.

In the case where the cross-sectional shapes of the second circular boss 702 and the first circular boss 902 are both right trapezoid, in one concave-convex stage group, the upper bottom edge of the right trapezoid of the second circular boss 702 is close to the lower bottom edge of the right trapezoid of the first circular boss 902, and the upper bottom edge and the lower bottom edge are located on the same side of the concave-convex stage group. This facilitates the arrangement of the throttle gap 903 and the expansion cavity 904 described above.

In some embodiments, as shown in fig. 4, in one concave-convex stage group, the gap between the second circular boss 702 and the first circular boss 902 on the side close to the motor back plate 7 is larger than the gap between the second circular boss 702 and the first circular boss 902 on the side far from the motor back plate 7, and the gap between two adjacent concave-convex stage groups on the side close to the motor back plate 7 is smaller than the gap between two adjacent concave-convex stage groups on the side far from the motor back plate 7.

In other embodiments, as shown in fig. 4, in one concave-convex stage group, the gap between the second circular boss 702 and the first circular boss 902 on the side close to the motor back plate 7 is smaller than the gap between the second circular boss 702 and the first circular boss 902 on the side far from the motor back plate 7, and the gap between two adjacent concave-convex stage groups on the side close to the motor back plate 7 is larger than the gap between two adjacent concave-convex stage groups on the side far from the motor back plate.

The arrangement is such that the throttle gaps 903 in two adjacent sets of relief tables are on different sides, so that during the fluid passing through the two adjacent sets of relief tables, a two-time throttle effect can be created by the fluid. That is, the fluid passes through the first restriction 903, the first expansion cavity 904, the second restriction 903, and the second expansion cavity 904 in this order during the flow through the adjacent two sets of relief tables. Therefore, the concave-convex table group can more effectively dissipate the kinetic energy of the fluid, so that the throttling effect is more obvious, and further, the sealing effect is better.

In some embodiments, referring to fig. 1, the motor spindle 5 is connected with the motor back plate 7 through a bearing 8, and an axial sheath 4 is further arranged on one side of the bearing 8 near the output end of the motor spindle 5, and the axial sheath 4 is coaxially arranged with the motor spindle 5; the axial sheath 4 is also sleeved with an axial sealing ring 3, and the axial sealing ring 3 is fixed on a motor backboard 7. By means of the arrangement, the axial sheath 4, the motor back plate 7 and the bearing 8 can form better sealing through the axial sealing ring 3.

In some embodiments, as shown in fig. 1, a second labyrinth seal 401 is provided between the axial jacket 4 and the axial seal ring 3. With this second labyrinth seal 401, a gap between the axial sheath 4 and the axial seal ring 3 can be sealed more effectively.

In some examples, the second labyrinth seal structure 401 may have the same structure as the first seal structure, and the specific arrangement manner thereof may refer to the first seal structure, which is not described herein.

In further examples, the second labyrinth seal 401 comprises a first duct, a second duct and a third duct, which are disposed in series communication between the axial jacket 4 and the axial seal 3, the first duct and the third duct being disposed along the length direction of the motor spindle 5, the second duct being disposed along the radial direction of the motor spindle 5. The second duct is used for transforming the three-dimensional phase, so that the fluid kinetic energy is consumed, and a good sealing effect can be formed in the radial direction. This effectively prevents the grease in the bearing 8 from leaking.

It should be noted that, in the first duct, the second duct and the third duct, the first sealing structure may be further added to seal the first duct, so as to achieve a more effective sealing effect.

In some embodiments, as shown in fig. 1, the axial sheath 4 is fixed on the motor spindle 5 through interference fit, so that quick installation of the axial sheath 4 can be realized, and meanwhile, the installation stability of the axial sheath can be effectively ensured.

In some embodiments, as shown in fig. 1, a sealing end cover 2 is further disposed on a side of the axial sealing ring 3 near the output end of the motor spindle 5, and the output end of the motor spindle 5 passes through the sealing end cover 2 and is connected with the impeller 9. The sealing end cover 2 is fixed on the motor backboard 7, and an elastic sealing ring 1 is arranged between the sealing end cover 2 and the motor backboard 7. The elastic sealing ring 1 can be used for effectively sealing the gap between the sealing end cover 2 and the motor backboard 7; and the sealing end cover 2 is arranged, so that the structure between the sealing end cover 2 and the motor backboard 7 can be protected, and the motor is prevented from being damaged.

In some examples, the seal end cap 2 may be secured to the motor backplate 7 by screws to achieve axial positioning. After the sealing end cover 2 is fixed on the motor back plate 7, the sealing end cover 2 generates axial pressure to force the elastic sealing ring 1 to deform, so that a better radial sealing effect can be provided.

In some embodiments, referring to fig. 1 and 2, a third labyrinth seal structure is provided between the seal end cap 2 and the motor spindle 5. By using the third labyrinth seal structure, the clearance between the seal end cover 2 and the motor main shaft 5 can be effectively sealed.

In some examples, the third labyrinth seal may be identical to the first or second labyrinth seal, thereby achieving a better sealing effect.

In other examples, the third labyrinth seal structure includes a plurality of toothed rings 201 on the seal end cap 2 on a side close to the motor spindle 5, the plurality of toothed rings 201 are coaxially disposed with the motor spindle 5, and the plurality of toothed rings 201 are sequentially arranged along the length direction of the motor spindle 5. In this way, the toothed ring 201 can block the gap between the seal cap 2 and the motor spindle 5, so that a throttling effect is produced.

In some examples, the cross-sectional shape of the ring gear 201 is "V" shaped, and a blocking gap 202 is formed between the tip of the ring gear 201 and the motor spindle 5, with which blocking gap 202 and the expansion cavity between adjacent ring gears 201 a good throttling effect can be achieved, thus forming a good sealing effect.

The foregoing is merely a specific embodiment of the disclosure, but the protection scope of the disclosure is not limited thereto, and any person skilled in the art who is skilled in the art will recognize that changes or substitutions are within the technical scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims (10)

1. The sealing structure for the high-speed fan is characterized by comprising a motor main shaft and a motor back plate, wherein the output end of the motor main shaft penetrates out of the motor back plate and is connected with an impeller, and the motor main shaft is configured to drive the impeller to rotate; a first labyrinth seal structure is arranged between the impeller and the motor back plate, and comprises a plurality of groups of first annular bosses positioned on one side of the impeller close to the motor back plate and a plurality of groups of second annular bosses positioned on one side of the motor back plate close to the impeller; the first annular bosses and the second annular bosses are arranged at equal intervals and are sequentially and alternately arranged along the direction close to the axis of the motor spindle; the plurality of groups of first circular boss and the plurality of groups of second circular boss are coaxially arranged with the motor spindle.

2. The seal of claim 1, wherein a second annular boss and an adjacent first annular boss form a set of embossments in which a gap between the first annular boss and the motor backplate and a gap between the second annular boss and the impeller are both less than a gap between the second annular boss and the first annular boss.

3. The seal structure according to claim 2, wherein in the concave-convex stage groups, a gap between the second circular ring boss and the first circular ring boss on a side close to the motor back plate is larger than a gap between the second circular ring boss and the first circular ring boss on a side far from the motor back plate, and a gap between two adjacent concave-convex stage groups on a side close to the motor back plate is smaller than a gap between two adjacent concave-convex stage groups on a side far from the motor back plate; or in the concave-convex table group, the gap between the second circular ring boss and the first circular ring boss at one side close to the motor back plate is smaller than the gap between the second circular ring boss and the first circular ring boss at one side far away from the motor back plate, and the gap between two adjacent concave-convex table groups at one side close to the motor back plate is larger than the gap between two adjacent concave-convex table groups at one side far away from the motor back plate.

4. The sealing structure according to claim 1, wherein the motor main shaft is connected with the motor back plate through a bearing, an axial sheath is further arranged on one side of the bearing, which is close to the output end of the motor main shaft, and the axial sheath is coaxially arranged with the motor main shaft; the axial sheath is also sleeved with an axial sealing ring, and the axial sealing ring is fixed on the motor backboard.

5. The seal of claim 4, wherein a second labyrinth seal is provided between the axial jacket and the axial seal ring.

6. The sealing structure according to claim 5, wherein the second labyrinth sealing structure comprises a first duct, a second duct and a third duct which are sequentially communicated between the axial sheath and the axial sealing ring, the first duct and the third duct are arranged along the length direction of the motor main shaft, and the second duct is arranged along the radial direction of the motor main shaft.

7. The seal of claim 4, wherein the axial jacket is secured to the motor spindle by an interference fit.

8. The sealing structure according to claim 4, wherein a sealing end cover is further arranged on one side of the axial sealing ring, which is close to the output end of the motor main shaft, and the output end of the motor main shaft penetrates out of the sealing end cover; the sealing end cover is fixed on the motor backboard, and an elastic sealing ring is further arranged between the sealing end cover and the motor backboard.

9. The seal arrangement of claim 8, wherein a third labyrinth seal arrangement is provided between the seal end cap and the motor spindle.

10. The seal structure according to claim 9, wherein the third labyrinth seal structure includes a plurality of toothed rings located on a side of the seal end cover, which is close to the motor spindle, the plurality of toothed rings being coaxially disposed with the motor spindle, and the plurality of toothed rings being sequentially arranged along a length direction of the motor spindle.