Blade top gap adjusting structure of semi-open type impeller of horizontal sewage pump

Abstract

The utility model designs a semi-open impeller top clearance adjusting structure of a horizontal sewage pump, which comprises a pump cover, an impeller, a pump body and a front cover, and is characterized in that the front cover is fixed on the pump body by a screw which is positioned in a pump body mounting hole and is sleeved in an adjusting bolt, and the screw is screwed in a front cover screw hole. Compared with the prior art, the novel structure has the advantages that the front cover is additionally arranged in the pump body, through optimization of the pump body structure, the adjusting bolt is introduced to push the front cover to adjust the blade top clearance of the semi-open type impeller towards the side of the semi-open type impeller in a micro distance mode, and the current situation that the pump efficiency is reduced after the pump runs for a long time is solved. Meanwhile, two O-shaped ring grooves are formed in the front cover and used for containing O-shaped rings, and liquid leakage is prevented.

Description

Technical Field

[0001] The utility model relates to a structure for adjusting the tip clearance of a semi-open impeller of a horizontal sewage pump. Background Art

[0002] Most of the impellers of horizontal sewage pumps are closed impellers. For their structures, see Figure 1 , 11 pump cover, 12 impeller, 402 top of blade, 13 pump body, 14 front cover, 401 top of front cover, 15 screw. The front cover is fixed on the pump body by screws. There is a tip clearance between the top of the front cover and the top of the blade. This tip clearance is not adjustable. The top of the blade of the closed impeller is integrally cast with the front cover of the impeller, and there is no tip clearance. A small number are semi-open impellers with tip clearances. Especially when transporting substances containing particles, the tip is severely worn, seriously affecting the pump efficiency. There is an urgent need to design a tip clearance adjustment structure to solve the current situation. Summary of the Invention

[0003] The purpose of the utility model patent is to design a structure for adjusting the tip clearance of a semi-open impeller of a horizontal sewage pump to timely adjust the tip clearance and solve the current situation of the decline in pump efficiency after the pump runs for a long time. The utility model designs a structure for adjusting the tip clearance of a semi-open impeller of a horizontal sewage pump, including a pump cover, an impeller, a pump body, and a front cover. The characteristics are that the side of the front cover is provided with a first mating surface of the front cover and a second mating surface of the front cover. A first sealing groove of the front cover is arranged on the first mating surface of the front cover, and a second sealing groove of the front cover is arranged on the second mating surface of the front cover. A second end face of the front cover is arranged at the outer top end of the front cover, a first end face of the front cover is arranged in the middle of the front cover, and a threaded hole of the front cover is arranged on the first end face of the front cover. The top of the front cover of the front cover corresponds to the top of the blade of the impeller. The front cover is fixed on the pump body by screws sleeved in adjusting bolts in the mounting holes of the pump body, and the screws are screwed into the threaded holes of the front cover. A first mating surface of the pump body is arranged in the pump body, and there is a transitional fit with the first mating surface of the front cover, with a tolerance of H11 / h11. The pump body is provided with a second mating surface of the pump body, and there is a 0.5-mm gap between it and the second mating surface of the front cover. The pump body is provided with a first end face of the pump body, and there is a 5-mm gap between it and the first end face of the front cover. The pump body is provided with a second end face of the pump body, and there is a 5-mm gap between it and the second end face of the front cover. O-rings are installed in both the first sealing groove and the second sealing groove of the front cover. The advantages of the utility model are as follows: The main highlight of this new structure is that a front cover is added to the pump body. Through the optimization of the pump body structure, an adjusting bolt is introduced to push the front cover to slightly adjust the tip clearance of the semi-open impeller towards the semi-open impeller side, solving the current situation of the decline in pump efficiency after the pump runs for a long time. At the same time, two O-ring grooves are arranged in the front cover for placing O-rings to prevent liquid leakage. Brief Description of the Drawings

[0004] Figure 1 It is a schematic structural diagram of the prior art.

[0005] Figure 2 This is a structural schematic diagram of the present utility model.

[0006] Figure 3 This is a structural schematic diagram of the front cover of the present utility model. Specific embodiments

[0007] The following will describe in detail the specific embodiments of the present utility model with reference to the accompanying drawings, so that those skilled in the art can more clearly understand how to practice the present utility model. Although the present utility model is described in conjunction with its preferred specific embodiments, these embodiments are only illustrative and do not limit the scope of the present utility model.

[0008] In the figure, a semi-open impeller tip clearance adjustment structure of a horizontal sewage pump includes a pump cover 1, an impeller 2, a pump body 3, and a front cover 5. It is characterized in that the side of the front cover 5 is provided with a first front cover mating surface 501 and a second front cover mating surface 502. A first front cover sealing groove 505 is provided on the first front cover mating surface 501, and a second front cover sealing groove 506 is provided on the second front cover mating surface 502. A second front cover end surface 504 is provided at the outer top end of the front cover 5, and a first front cover end surface 503 is provided in the middle of the front cover 5. A front cover threaded hole 507 is provided on the first front cover end surface 503. The top 508 of the front cover 5 corresponds to the top 201 of the blade of the impeller 2. The front cover 5 is fixed to the pump body by a screw 6 sleeved in an adjusting bolt 7 and located in the pump body mounting hole. The screw 6 is screwed into the front cover threaded hole 507. A first pump body mating surface is provided in the pump body, and there is a transitional fit with the first front cover mating surface, with a tolerance of H11 / h11. The pump body is provided with a second pump body mating surface, and there is a 0.5 mm gap between it and the second front cover mating surface. The pump body is provided with a first pump body end surface, and there is a 5 mm gap between it and the first front cover end surface. The pump body is provided with a second pump body end surface, and there is a 5 mm gap between it and the second front cover end surface. O-rings are installed in both the first front cover sealing groove and the second sealing groove.

[0009] In the assembly structure, the adjusting bolt is screwed into the pump body threaded hole, and the screw is screwed into the adjusting bolt. During the operation of the pump, after the tip is severely worn, the screw is loosened, and the gap between the front cover and the top of the impeller blade is re-controlled through the adjusting bolt, and the screw is tightened to fix the relative position of the front cover and the pump body. The main highlight of this new structure is that a front cover is added to the pump body. Through the optimization of the pump body structure, an adjusting bolt is introduced to push the front cover to slightly adjust the tip clearance of the semi-open impeller towards the semi-open impeller side, solving the problem of the decrease in pump efficiency after the pump has been running for a long time. At the same time, two O-ring grooves are provided in the front cover for placing O-rings to prevent liquid leakage.

Claims

1. A semi-open impeller tip clearance adjustment structure for a horizontal sewage pump, comprising a pump cover, an impeller, a pump body, and a front cover, characterized in that: The front cover side is provided with a first front cover mating surface and a second front cover mating surface, a first front cover sealing groove is provided on the first front cover mating surface, a second front cover sealing groove is provided on the second front cover mating surface, a second front cover end surface is provided at the top end of the outer side of the front cover, a first front cover end surface is provided in the middle of the front cover, a front cover thread hole is provided on the first front cover end surface, the front cover top corresponds to the top of the impeller blade, the front cover is fixed to the pump body by a screw sleeved in the adjusting bolt located in the pump body mounting hole, and the screw is screwed into the front cover thread hole.

2. The semi-open impeller tip clearance adjustment structure of a horizontal sewage pump according to claim 1, characterized in that: A first matching surface of the pump body is arranged in the pump body, and is transitionally matched with the first matching surface of the front cover, with a tolerance of H11 / h11.

3. The semi-open impeller tip clearance adjustment structure of a horizontal sewage pump according to claim 1, characterized in that: The pump body is provided with a second matching surface of the pump body, and a gap of 0.5 mm is reserved between the pump body and the second matching surface of the front cover.

4. The semi-open impeller tip clearance adjustment structure of a horizontal sewage pump according to claim 1, characterized in that: The pump body is provided with a first end face of the pump body, and a gap of 5 mm is left between the first end face of the front cover.

5. The semi-open impeller tip clearance adjustment structure of a horizontal sewage pump according to claim 1, characterized in that: The pump body is provided with a second end face of the pump body, and a gap of 5 mm is left between the second end face of the front cover.

6. The semi-open impeller tip clearance adjustment structure of a horizontal sewage pump according to claim 1, characterized in that: O-rings are installed in the first sealing groove and the second sealing groove of the front cover.

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