Large sewage pump impeller fastening structure

Abstract

The utility model provides a large-scale sewage pump impeller fastening structure which is characterized in that an impeller is sleeved on the outer side of a main shaft, a hub of the impeller and the outer side of the main shaft are matched and positioned through a concave-convex structure of a convex key and a concave-convex structure of a groove, the front end of the main shaft is sleeved with a hexagon nut, and an internal thread groove is arranged in the hexagon nut and is matched and connected with an external thread of the main shaft. The rear end of the hexagon nut is attached to the front end of an impeller hub, nut screw holes are formed in the six corners of the hexagon nut respectively, screws are screwed into the nut screw holes, chiseling grooves are formed in the six faces of the hexagon nut respectively, twelve impeller screw holes are formed in the rear end of the hub in the circumferential direction, and the rear ends of the screws are in threaded connection with the impeller screw holes. The position of the impeller screw hole corresponds to that of the nut screw hole; according to the integral impeller hexagon nut, the kidney-shaped holes are formed in the side plane, not close to an impeller, of the hexagon nut, the number of the threaded holes in the front end face of the impeller is increased, a nut screw hole can be aligned with an impeller screw hole conveniently, and the impeller nut can be prevented from rotating reversely and falling off by screwing in a screw.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage pump impellers, in particular to a fastening structure of a large sewage pump impeller. Background Art

[0002] Large sewage pump shaft heads are often equipped with shaft head nuts to prevent the impeller from loosening. For the impeller fastening structure, see Figure 1 The prior art generally sets an impeller nut I and an impeller nut II. The structure of the impeller nut I is shown in Figure 2 , impeller nut II structure see Figure 3 The impeller nut I is used to fasten the impeller, and the impeller nut II is used to protect the shaft head. The structure of the impeller front end face is shown in Figure 4 .

[0003] In the above structure, after the impeller nut I is tightened to the impeller, the screw is matched with the threaded hole on the front end face of the impeller and tightened to prevent the impeller from loosening. However, when the impeller reverses, there is a risk that the impeller nut II will fall off, and a structure needs to be designed to prevent the occurrence of dangerous falling situations. Summary of the invention

[0004] The utility model aims to provide a large sewage pump impeller fastening structure.

[0005] In order to achieve the above purpose, the technical solution of the utility model is:

[0006] A large sewage pump impeller fastening structure, the impeller is sleeved on the outer side of the main shaft, the impeller hub and the outer side of the main shaft are positioned by the concave-convex structure of the convex key and the groove, and is characterized in that the front end of the main shaft is sleeved with a hexagonal nut, the hexagonal nut is provided with an internal thread groove, the internal thread groove is matched with the external thread of the main shaft, the rear end of the hexagonal nut is fitted with the front end of the hub, the six corners of the hexagonal nut are respectively penetrated by a nut screw hole in the front-to-back direction, screws are screwed into the nut screw holes, the centers of the six faces of the hexagonal nut are respectively provided with a chisel groove along the axial direction, the rear end of the hub is evenly provided with twelve impeller screw holes along the circumferential direction, the rear end of the screw is threadedly connected to the impeller screw hole, and the position of the impeller screw hole corresponds to the position of the nut screw hole.

[0007] Furthermore, a countersink is provided at the front end of the screw hole, and both the nut screw hole and the countersink are waist-shaped holes.

[0008] Furthermore, the front end of the hexagonal nut is provided with a convex spherical surface, the interior of the convex spherical surface is provided with a thread backing groove, the rear end of the thread backing groove is integrally connected with the front end of the internal thread groove, and the inner diameter of the thread backing groove is larger than the inner diameter of the internal thread groove.

[0009] Furthermore, a conical bottom groove is provided at the front end of the thread backing groove.

[0010] The utility model designs an integral impeller hexagonal nut, which not only fastens the impeller but also protects the shaft head; a plurality of waist-shaped holes are arranged on the side plane of the hexagonal nut not close to the impeller; a threaded hole is added on the front end surface of the impeller, so that the screw hole of the nut is easy to align with the screw hole of the impeller; and the impeller nut can be prevented from reversing and falling off by screwing in the screw; a chisel groove is milled on the hexagon of the hexagonal nut, so that it is convenient to use a chisel for installation and disassembly when there is no impeller wrench. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a diagram of the impeller fastening structure in the prior art;

[0012] Figure 2 It is a structural diagram of an impeller nut I in the prior art;

[0013] Figure 3 This is a structural diagram of an impeller nut II in the prior art;

[0014] Figure 4 This is a structural diagram of the impeller front end surface in the prior art;

[0015] Figure 5 This is the overall structure diagram of the utility model;

[0016] Figure 6 This is a side sectional view of the hexagonal nut of the utility model;

[0017] Figure 7 This is a structural diagram of the front end face of the hexagonal nut of the utility model;

[0018] Figure 8 This is a structural diagram of the front end face of the impeller hub of the utility model.

[0019] Reference numerals:

[0020] 1 cam, 2 main shaft, 3 impeller, 31 hub, 32 impeller screw hole, 4 screws,

[0021] 5 hexagonal nut, 51 convex spherical surface, 52 thread back cutter groove, 53 countersunk hole, 54 nut screw hole,

[0022] 55 internal thread groove, 56 chisel groove. DETAILED DESCRIPTION

[0023] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] The utility model discloses a large sewage pump impeller fastening structure, such as Figure 5As shown, the impeller 3 is sleeved on the outer side of the main shaft 2, and the hub 31 of the impeller 3 is positioned with the outer side of the main shaft through the concave-convex structure of the convex key 1 and the groove, and the front end of the main shaft 2 is sleeved with the hexagonal nut 5, and the hexagonal nut 5 is provided with an internal thread groove 55, which is connected with the external thread of the main shaft 2, and the rear end of the hexagonal nut 5 is in contact with the front end of the hub 31.

[0025] like Figure 6 and Figure 7 As shown, the six corners of the hexagonal nut 5 are respectively provided with a nut screw hole 54 along the front-back direction, and the screw 4 is screwed into the nut screw hole 54. The center of the six faces of the hexagonal nut 5 is respectively provided with a chisel groove 56 along the axial direction. Figure 8 As shown, twelve impeller screw holes 32 are evenly arranged at the rear end of the hub 31 along the circumferential direction, the rear end of the screw 4 is threadedly connected to the impeller screw hole 32, the position of the impeller screw hole 32 corresponds to the position of the nut screw hole 54, and a countersunk hole 53 is arranged at the front end of the nut screw hole 54.

[0026] The nut screw hole 54 and the countersunk hole 53 are arranged as waist-shaped holes to increase the number of the impeller screw holes 32, so that the nut screw hole 54 can be aligned with the impeller screw hole 32 after the hexagonal nut 5 is screwed in place. The chiseled groove 56 can be chiseled to rotate the hexagonal nut 5 by using a chisel, without the need for a special tool, such as an impeller wrench.

[0027] like Figure 6 As shown, the front end of the hexagonal nut 5 is provided with a convex spherical surface 51, and the interior of the convex spherical surface 51 is provided with a thread back groove 52. The rear end of the thread back groove 52 is connected to the front end of the internal thread groove 55 as a whole. The inner diameter of the thread back groove 52 is larger than the inner diameter of the internal thread groove 55, and the front end of the thread back groove 52 is provided with a conical bottom groove.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A large sewage pump impeller fastening structure, wherein the impeller is sleeved on the outer side of the main shaft, and the hub of the impeller and the outer side of the main shaft are positioned by a concave-convex structure of a convex key and a groove, characterized in that: The front end of the main shaft is sleeved with a hexagonal nut, and an internal thread groove is provided inside the hexagonal nut, and the internal thread groove is matched with the external thread of the main shaft. The rear end of the hexagonal nut is fitted with the front end of the wheel hub, and the six corners of the hexagonal nut are respectively penetrated by a nut screw hole along the front-to-back direction, and screws are screwed into the nut screw holes. The centers of the six faces of the hexagonal nut are respectively provided with a chiseled groove along the axial direction, and the rear end of the wheel hub is evenly provided with twelve impeller screw holes along the circumferential direction. The rear end of the screw is threadedly connected to the impeller screw hole, and the position of the impeller screw hole corresponds to the position of the nut screw hole.

2. The large sewage pump impeller fastening structure according to claim 1 is characterized in that: A countersunk hole is arranged at the front end of the screw hole, and both the nut screw hole and the countersunk hole are waist-shaped holes.

3. The large sewage pump impeller fastening structure according to claim 1 is characterized in that: The front end of the hexagonal nut is provided with a convex spherical surface, the interior of the convex spherical surface is provided with a thread backing groove, the rear end of the thread backing groove is integrally connected with the front end of the internal thread groove, and the inner diameter of the thread backing groove is larger than the inner diameter of the internal thread groove.

4. The large sewage pump impeller fastening structure according to claim 3 is characterized in that: The front end of the thread backing groove is provided with a conical bottom groove.

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