CN220081739U - Impeller shaft assembly component and fire pump - Google Patents

Abstract

The utility model discloses an impeller shaft assembly component and a fire pump, wherein the impeller shaft assembly component comprises: a transmission shaft; the impeller assembly comprises an impeller hub, a first through hole is formed in the impeller hub, the inner diameter of the first through hole is sequentially reduced along a first direction, and the first direction is the axis direction of the transmission shaft; the taper sleeve is provided with a large-diameter end face, a small-diameter end face, a second through hole which is matched with the transmission shaft and penetrates through the large-diameter end face and the small-diameter end face, and an outer conical surface which is matched with the first through hole, wherein the taper sleeve is pressed on the transmission shaft through deformation. The embodiment of the utility model is beneficial to simultaneously meeting the safety requirement of the pump and the requirement of controlling the manufacturing cost.

Description

Impeller shaft assembly component and fire pump

Technical Field

The utility model belongs to the technical field of pumps, and particularly relates to an impeller shaft assembly component and a fire pump.

Background

Pumps are machines for transporting or pressurizing fluids, and in pumps of the type such as mixed-flow pumps and centrifugal pumps, the pumps generally have an impeller and a transmission shaft, and the impeller is driven to rotate by the transmission shaft to drive or pressurize the fluid.

In the prior art, the impeller and the transmission shaft are generally and fixedly connected in the circumferential direction through keys, accordingly, key grooves are formed in the transmission shaft, the strength of the transmission shaft is reduced due to the key grooves, particularly in pumps with multistage impellers, the length-diameter ratio of the transmission shaft is large, the processed key grooves are more, the strength of the shaft is intangibly reduced, the phenomenon of water pump shaft breakage is easily caused at the stress concentration point of the key grooves, and hidden danger is brought to the safe operation of the pump. The processing mode of increasing the shaft diameter of the transmission shaft to meet the strength requirement can also lead to the increase of the manufacturing cost of the pump.

Disclosure of Invention

The utility model aims to provide an impeller shaft assembly component and a fire pump, which at least solve the problem that the related technology is difficult to meet the requirements of safety and manufacturing cost of the pump at the same time.

In order to solve the technical problems, the utility model is realized as follows:

in a first aspect, embodiments of the present utility model provide an impeller shaft assembly comprising:

a transmission shaft;

the impeller assembly comprises an impeller hub, a first through hole is formed in the impeller hub, the inner diameter of the first through hole is sequentially reduced along a first direction, and the first direction is the axis direction of the transmission shaft;

the taper sleeve is provided with a large-diameter end face, a small-diameter end face, a second through hole which is matched with the transmission shaft and penetrates through the large-diameter end face and the small-diameter end face, and an outer conical surface which is matched with the first through hole, wherein the taper sleeve is pressed on the transmission shaft through deformation.

Optionally, the taper sleeve is provided with a notch extending along the axial direction, the notch penetrates through at least one end of the large-diameter end face and the small-diameter end face, and the notch penetrates through the wall surface of the taper sleeve in the radial direction of the taper sleeve;

the force of the impeller hub acting on the outer conical surface reduces the width of the notch so that the taper sleeve is pressed on the transmission shaft.

Optionally, the taper sleeve further comprises an external thread part which is close to the small-diameter end surface relative to the external conical surface;

the impeller shaft assembly further includes a fastening nut coupled to the external threaded portion.

Optionally, the fastening nut is attached to the hub end surface of the impeller hub, and the fastening nut is used for driving the impeller assembly and the taper sleeve to move relatively so as to lock the impeller hub to the outer conical surface.

Optionally, the external thread portion includes a plurality of circumferentially spaced apart tabs that are compressed against the drive shaft with the fastening nut attached to the external thread portion.

Optionally, the number of the fastening nuts is multiple, and the fastening nuts are sequentially screwed on the external thread part along the axial direction.

Optionally, the cone sleeve is in an undeformed state, and the cone sleeve is in clearance fit with the transmission shaft.

Optionally, the inclination angle of the outer conical surface is 1-3 degrees; the width of the notch of the taper sleeve is 1.5 mm-2.5 mm in an undeformed state.

In a second aspect, embodiments of the present utility model also provide a fire pump comprising an impeller shaft assembly as described in the first aspect.

Optionally, a plurality of impeller assemblies are sequentially arranged on a transmission shaft included in the impeller shaft assembly along the axial direction, and each impeller assembly is connected with the transmission shaft through a taper sleeve.

The impeller shaft assembly component comprises a transmission shaft, an impeller component and a taper sleeve, wherein the impeller component comprises an impeller hub, a first through hole is formed in the impeller hub, the first through hole is sequentially reduced along the inner diameter of the first direction, the taper sleeve is provided with a large-diameter end face, a small-diameter end face, a second through hole which is matched with the transmission shaft and penetrates through the large-diameter end face and the small-diameter end face, and an outer conical surface which is matched with the first through hole, and the taper sleeve is pressed on the transmission shaft through deformation. The embodiment can obviously simplify the structure of the transmission shaft without arranging a key groove or a shaft shoulder for fixing the impeller hub. In addition, because the key groove is not needed, the reduction of the strength of the transmission shaft caused by the key groove is avoided, and the diameter of the transmission shaft is not needed to be increased for enhancing the strength of the transmission shaft, thereby being beneficial to simultaneously meeting the safety requirement of the pump and the requirement of controlling the manufacturing cost.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic view of an impeller shaft assembly provided in an embodiment of the present utility model;

FIG. 2 is a schematic longitudinal cross-sectional view of a drogue in accordance with an embodiment of the utility model;

FIG. 3 is a schematic view of an axial projection structure of a cone sleeve according to an embodiment of the present utility model;

FIG. 4 is a schematic view of the structure of a wheel assembly according to an embodiment of the present utility model;

fig. 5 is a schematic structural view of a transmission shaft according to an embodiment of the present utility model.

Reference numerals:

100-transmission shaft, 200-impeller assembly, 210-impeller hub, 211-first through hole, 212-inner conical surface, 213-hub end surface, 300-taper sleeve, 310-large-diameter end surface, 320-small-diameter end surface, 330-second through hole, 331-inner wall surface, 340-outer conical surface, 350-outer threaded part, 360-notch and 400-fastening nut.

Detailed Description

Reference will now be made in detail to the present embodiments of the present utility model, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the like or similar elements throughout or elements having the same or similar functions. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The features of the utility model "first", "second" and the like in the description and in the claims may be used for the explicit or implicit inclusion of one or more such features. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1 to 5, an impeller shaft assembly according to some embodiments of the present utility model includes:

a drive shaft 100;

the impeller assembly 200, the impeller assembly 200 includes an impeller hub 210, a first through hole 211 is provided in the impeller hub 210, the first through hole 211 is sequentially reduced along a first direction, and the first direction is an axial direction of the transmission shaft 100;

the taper sleeve 300, the taper sleeve 300 has a large diameter end surface 310, a small diameter end surface 320, a second through hole 330 which is matched with the transmission shaft 100 and penetrates through the large diameter end surface 310 and the small diameter end surface 320, and an outer conical surface 340 which is matched with the first through hole 211, wherein the taper sleeve 300 is pressed on the transmission shaft 100 through deformation.

The impeller shaft assembly provided by the embodiment of the utility model can be specifically an assembly structure of the transmission shaft 100 and the impeller assembly 200 for a pump, wherein the pump can be a mixed flow pump or a centrifugal pump in terms of working principle, and the pump can be a fire pump or a condensation pump in terms of application. The type of pump is not particularly limited here, and may include a drive shaft 100 and an impeller assembly 200.

The impeller assembly 200 may include an impeller hub 210. Typically, the impeller hub 210 is used to secure the blades included in the impeller assembly 200. The impeller hub 210 is provided therein with a first through hole 211, and the inside diameter of the first through hole 211 is sequentially reduced in a first direction, which is the axial direction of the drive shaft 100. In one example, the first through hole 211 may be a tapered hole.

The cone sleeve 300 may have a large diameter end surface 310 and a small diameter end surface 320, that is, there is a variation in the outer diameter of the cone sleeve 300, which also allows the cone sleeve 300 to have an outer conical surface 340 that fits into the first through hole 211, where the definition of fit may refer to the outer conical surface 340 penetrating into the first through hole 211. It is easy to understand that, when the taper sleeve 300 is assembled with the impeller hub 210, as the impeller hub 210 moves towards the large-diameter end face 310 relative to the taper sleeve 300, under the action of the conical surface, the taper sleeve 300 and the impeller hub 210 can be gradually changed from clearance fit into transition fit or interference fit, so that the connection between the taper sleeve 300 and the impeller hub 210 is gradually tightened, and relative fixation in the circumferential direction and the axial direction is realized.

The cone sleeve 300 also has a second through bore 330 that fits with the drive shaft 100 and extends through the large diameter end face 310 and the small diameter end face 320, similarly, the fit herein may refer to the drive shaft 100 being able to pass into the second through bore 330. In this embodiment, the taper sleeve 300 may be pressed against the transmission shaft 100 by deformation, and at this time, the outer wall surface of the transmission shaft 100 may be tightly attached to the inner wall surface 331 corresponding to the second through hole 330.

In combination with some examples, the taper sleeve 300 may be provided with a notch penetrating through the large-diameter end surface 310 and the small-diameter end surface 320 along the axial direction, and as the impeller hub 210 moves towards the large-diameter end surface 310 relative to the taper sleeve 300, the impeller profile extrudes the taper sleeve 300, so that the taper sleeve 300 is deformed, specifically, the width of the notch becomes smaller, the cross-sectional area of the second through hole 330 of the taper sleeve 300 becomes smaller, the taper sleeve 300 and the transmission shaft 100 are mutually pressed, so that relative fixation between the taper sleeve 300 and the transmission shaft 100 is realized, and the pressing can be regarded as transition fit or interference fit between the taper sleeve 300 and the transmission shaft 100 to a certain extent, so that relative fixation in the circumferential direction and the axial direction is realized.

In other examples, the cone sleeve 300 may have a plurality of arcuate blades intermittently disposed in a circumferential direction, and the outer circumferential surfaces of the arcuate blades may be provided with external threads, and when the nut is screwed onto the external threads, a radial force may be applied to the arcuate blades, such that the arcuate blades deform and compress against the drive shaft 100.

Of course, the foregoing is illustrative of some of the possible configurations in which the cone sleeve 300 is compressed onto the drive shaft 100 by deformation. As shown in fig. 5, compared with the conventional structure of fixing the taper sleeve 300 and the transmission shaft 100 in the circumferential direction by a key, the structure of fixing the taper sleeve 300 and the transmission shaft 100 in the axial direction by a shoulder is achieved, and the structure of the transmission shaft 100 can be significantly simplified without a key slot or a shoulder for fixing the impeller hub 210. In addition, since the key groove is not required, the reduction of the strength of the transmission shaft 100 caused by the key groove is avoided, and the diameter of the transmission shaft 100 is not required to be increased for enhancing the strength of the transmission shaft 100, thereby being beneficial to simultaneously meeting the safety requirement of the pump and the requirement of controlling the manufacturing cost.

Optionally, the cone sleeve 300 is provided with a notch 360 extending along the axial direction, the notch 360 penetrates through at least one end of the large-diameter end face 310 and the small-diameter end face 320, and the notch 360 penetrates through the wall surface of the cone sleeve 300 in the radial direction of the cone sleeve 300;

wherein the force of the impeller hub 210 against the outer conical surface 340 reduces the width of the notch 360 to compress the cone sleeve 300 against the drive shaft 100.

In this embodiment, the axially extending notches 360 provided on the cone sleeve 300 may correspond to the notches mentioned in the examples above. As shown in fig. 3, in one example, the notch 360 penetrates through both the large diameter end face 310 and the small diameter end face 320, and the notch 360 penetrates through the wall surface of the cone sleeve 300 in the radial direction of the cone sleeve 300, so that, on the axial projection of the cone sleeve 300, there is a notch with a width t. The extrusion of the impeller hub 210 from the cone sleeve 300 acts on the notch 360 to continuously reduce the width t, thereby reducing the cross-sectional area and the inner diameter of the second through hole 330 on the cone sleeve 300, and the reduction of the inner diameter of the sleeve can make the connection between the cone sleeve 300 and the transmission shaft 100 more compact.

Of course, in some possible embodiments, the notch 360 may extend through only the large-diameter end surface 310 or only the small-diameter end surface 320, and when the cone sleeve 300 is pressed by the impeller hub 210, the width of the notch 360 may be reduced, so that the cone sleeve 300 and the transmission shaft 100 are tightly connected.

Optionally, the cone sleeve 300 further includes an external threaded portion 350 adjacent the minor diameter end surface 320 relative to the external tapered surface 340; the impeller shaft assembly further includes a fastening nut 400, the fastening nut 400 being connected to the externally threaded portion 350.

As shown in fig. 2, the outer tapered surface 340 is closer to the large diameter end surface 310, and the outer threaded portion 350 is closer to the small diameter end surface 320, and an angle θ exists between the outer contour line of the outer tapered surface 340 and the axis line in the longitudinal section. By connecting the fastening nut 400 to the male screw portion 350 by different structural designs, any of the following effects can be obtained: firstly, the axial relative fixation between the taper sleeve 300 and the impeller hub 210 is realized, and secondly, the external thread part 350 can be deformed by fastening the nut 400, so that the external thread part 350 is deformed and is fixed relative to the transmission shaft 100.

A possible embodiment for achieving the first effect is described below. As shown in fig. 1 and 4, in this embodiment, the fastening nut 400 is attached to the hub end surface 213 of the impeller hub 210, and the fastening nut 400 is used to drive the impeller assembly 200 and the cone sleeve 300 to move relatively so as to lock the impeller hub 210 to the outer conical surface 340.

The fastening nut 400 may be fitted to the externally threaded portion 350 from the end of the small diameter end surface 320, and as the fastening nut 400 rotates, may approach the impeller assembly 200 pre-fitted to the cone sleeve 300. The impeller profile has a hub end surface 213 facing the fastening nut 400, and when the fastening nut 400 contacts with the impeller hub 210 end surface, if the fastening nut is able to continue to screw into the side where the large-diameter end surface 310 is located, the impeller assembly 200 can be pushed to move towards the large-diameter end surface 310, so that the impeller assembly 200 and the taper sleeve 300 are more firmly connected. When the fastening nut 400 is rotated in place, it can function to prevent the impeller assembly 200 from backing out toward the small diameter end face 320, further enabling axial relative fixation between the cone sleeve 300 and the impeller hub 210.

To achieve the effect of deforming the external screw portion 350 by the fastening nut 400 to deform the external screw portion 350 and fix it relative to the drive shaft 100, in one embodiment, the external screw portion 350 includes a plurality of sheet-like bodies (not shown) arranged at intervals in the circumferential direction, which are pressed against the drive shaft 100 in the case that the fastening nut 400 is coupled to the external screw portion 350.

In this embodiment, the external thread portion 350 includes a plurality of circumferentially spaced apart tabs, which also allows for a gap between two adjacent tabs that corresponds to the gap that may extend through the small diameter end face 320. When the fastening nut 400 is screwed onto the external thread portion 350, a radial acting force can be generated on the sheet-shaped body, and one end of the sheet-shaped body, which is close to the small-diameter end face 320, is bent towards the transmission shaft 100, so that the transmission shaft 100 is extruded, the external thread portion 350 and the transmission shaft 100 are fixed, and the taper sleeve 300 and the transmission shaft 100 are fixed.

Alternatively, as shown in fig. 1, in the above embodiment, the number of the fastening nuts 400 is plural, and the plural fastening nuts 400 are sequentially screwed to the external thread portion 350 in the axial direction, so that the anti-loosening effect of the fastening nuts 400 can be effectively achieved.

In one example, the number of fastening nuts 400 is two, and the external thread portion 350 is denoted as L, and L may be l=2×the width of the round nut+ (2 mm to 4 mm), so that the length of the taper sleeve 300 is prevented from being excessively large while ensuring that all the fastening nuts 400 are reliably coupled to the external thread portion 350.

Alternatively, the cone sleeve 300 is in a non-deformed state, the cone sleeve 300 being in clearance fit with the drive shaft 100.

As shown above, the cone sleeve 300 may be pressed on the transmission shaft 100 by deformation, and in this embodiment, the cone sleeve 300 may be in clearance fit with the transmission shaft 100 in an undeformed state, so that the difficulty in assembling the cone sleeve 300 and the transmission shaft 100 may be reduced.

Similarly, the angle of the corresponding inner taper 212 of the first through bore 211 may be consistent with the angle of the outer taper 340 of the cone sleeve 300, and prior to assembly, the inner taper 212 of the impeller hub 210 and the outer taper 340 of the cone sleeve 300 may be considered to be a clearance fit, such that the impeller profile may be easily pre-fit onto the outer taper 340 prior to assembly.

In some examples, as shown in fig. 2 and 3, the angle of inclination θ of the outer cone 340 is 1 ° to 3 °; the width t of the notch 360 is 1.5mm to 2.5mm when the cone sleeve 300 is in an undeformed state.

Of course, in practical applications, the above dimensions may be reasonably adjusted according to assembly or processing requirements, and are not illustrated herein.

The embodiment of the utility model also provides a fire pump which comprises the impeller shaft assembly component.

It will be readily appreciated that the embodiments described hereinabove in relation to the impeller shaft assembly are equally applicable to the fire pump and achieve the same technical result.

Optionally, a plurality of impeller assemblies 200 are sequentially disposed on the transmission shaft 100 included in the impeller shaft assembly along the axial direction, and each impeller assembly 200 is connected to the transmission shaft 100 through a taper sleeve 300.

In one specific application, the fire pump provided by the present utility model includes an impeller assembly 200, a cone sleeve 300, a transmission shaft 100, and a round nut (corresponding fastening nut 400). The taper sleeve 300 is a frustum cylinder with a large end and a small end, a notch 360 is axially formed in the taper sleeve 300 from the large end to the small end, and an external thread (corresponding to the external thread part 350) with a certain length is formed in the small end of the taper sleeve 300; the outer cylindrical surface of the transmission shaft 100 is assembled with the inner cylindrical surface (corresponding to the inner wall surface 331 of the second through hole 330) of the taper sleeve 300 in a matched manner; the inner conical surface (corresponding to the first through hole 211) of the impeller hub 210 of the impeller assembly 200 is matched and assembled with the outer conical surface (corresponding to the outer conical surface 340) of the cone sleeve 300; the round nut is in two parallel assembly modes, and has a locking function on the taper sleeve 300. According to the embodiment of the utility model, the taper sleeve 300, the transmission shaft 100 and the impeller assembly 200 are assembled in a mutually matched manner, the end face of the round nut is utilized to press the hub end face 213 of the impeller hub 210 at the small end of the taper sleeve 300, so that the taper sleeve 300 is driven to move from the large end face to the small end face, the axial notch 360 of the taper sleeve 300 is narrowed, the diameter of the inner cylindrical surface of the taper sleeve 300 is reduced, the taper sleeve 300 is tightly held on the transmission shaft 100, and meanwhile, the taper sleeve 300 is tightly matched with the inner conical surface of the impeller hub 210, so that the purpose of installing an impeller is achieved, torque can be effectively transmitted, a key groove is prevented from being formed in the shaft, the strength of the transmission shaft 100 is improved, the service life of a product is prolonged, and the application value is high.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (8)

1. An impeller shaft assembly comprising:

a drive shaft (100);

the impeller assembly (200), the impeller assembly (200) comprises an impeller hub (210), a first through hole (211) is formed in the impeller hub (210), the first through hole (211) is sequentially reduced along a first direction, and the first direction is the axial direction of the transmission shaft (100);

the taper sleeve (300) is provided with a large-diameter end face (310), a small-diameter end face (320), a second through hole (330) which is matched with the transmission shaft (100) and penetrates through the large-diameter end face (310) and the small-diameter end face (320), and an outer conical surface (340) which is matched with the first through hole (211), wherein the taper sleeve (300) is pressed on the transmission shaft (100) through deformation;

the taper sleeve (300) further includes an external threaded portion (350) adjacent the small diameter end face (320) relative to the external tapered surface (340);

the impeller shaft assembly further comprises a fastening nut (400), the fastening nut (400) being connected to the externally threaded portion (350);

the fastening nut (400) is attached to the hub end face (213) of the impeller hub (210), and the fastening nut (400) is used for driving the impeller assembly (200) and the taper sleeve (300) to move relatively so that the impeller hub (210) is locked on the outer conical surface (340).

2. The impeller shaft assembly according to claim 1, characterized in that the cone sleeve (300) is provided with axially extending slots (360), the slots (360) extending through at least one of the large diameter end face (310) and the small diameter end face (320), and the slots (360) extending through the wall of the cone sleeve (300) in the radial direction of the cone sleeve (300);

wherein the force of the impeller hub (210) on the outer conical surface (340) reduces the width of the slot (360) such that the cone sleeve (300) is compressed against the drive shaft (100).

3. The impeller shaft assembly according to claim 1 or 2, characterized in that the male threaded portion (350) comprises a plurality of circumferentially spaced apart tabs which are pressed against the drive shaft (100) with the fastening nut (400) connected to the male threaded portion (350).

4. The impeller shaft assembly according to claim 1 or 2, characterized in that the number of the fastening nuts (400) is plural, and that a plurality of the fastening nuts (400) are screwed to the male screw portion (350) in order in the axial direction.

5. The impeller shaft assembly of claim 1, wherein the cone sleeve (300) is in an undeformed state, the cone sleeve (300) being in clearance fit with the drive shaft (100).

6. The impeller shaft assembly according to claim 2, characterized in that the angle of inclination of the outer conical surface (340) is 1-3 °; the width of the notch (360) is 1.5 mm-2.5 mm when the taper sleeve (300) is in an undeformed state.

7. A fire pump comprising the impeller shaft assembly of any one of claims 1 to 6.

8. The fire pump according to claim 7, wherein the impeller shaft assembly comprises a transmission shaft (100) on which a plurality of impeller assemblies (200) are sequentially disposed in an axial direction, and each impeller assembly (200) is connected to the transmission shaft (100) through a taper sleeve (300).