A water inlet pump impeller and volute clearance adjusting structure

Abstract

The utility model relates to the pump valve field, especially a water inlet pump impeller and volute gap adjusting structure, inlaying metal ring at the water pump impeller and volute connecting place, including volute inside inlaying metal fixed ring, inlaying metal moving ring at the impeller outer ring. The device inlays metal ring at the water pump impeller and volute connecting place, reduces the impeller gap, reduces the volume loss and friction loss of pump whole, strengthens the service life of pump, and reduces economic cost.

Description

Technical Field

[0001] This utility model relates to the field of pumps and valves, and in particular to a structure for adjusting the clearance between the impeller and the volute of an inlet pump. Background Technology

[0002] The existing wastewater treatment plant is experiencing a significant decrease in the rated flow rate of its influent pumps. The main reason for this decrease is severe wear and tear on the gap between the pump casing and the impeller. To restore the pumps' rated operating parameters, ensure the effective operation of the equipment's backup mechanism, and reduce energy consumption in the plant area, a technical upgrade of the influent pumps is proposed. Utility Model Content

[0003] The purpose of this invention is to provide a structure for adjusting the clearance between the impeller and the volute of a water pump, which reduces the impeller clearance through simple modifications.

[0004] The above-mentioned technical problems are solved by the following technical solutions:

[0005] A gap adjustment structure for an inlet pump impeller and volute casing is provided, wherein a metal ring is embedded at the connection between the pump impeller and the volute casing, including a fixed metal ring embedded inside the volute casing and a moving metal ring embedded on the outer ring of the impeller.

[0006] Further technology of this utility model:

[0007] Preferably, the volute includes an outer shell and an inner shell;

[0008] The outer casing includes a pump body and a pump cover, with the pump body connected to the pump cover by bolts.

[0009] The inner housing includes a front guard plate, a rear guard plate, and a sleeve. The front guard plate is bolted to the pump cover, and the rear guard plate is bolted to the pump body. The front guard plate, the rear guard plate, and the sleeve abut against each other.

[0010] Preferably, the front guard plate is bent towards the pump inlet and has a pipe section. The outer ring of the impeller extends along the front guard plate and is the same length as the pipe section. A metal fixed ring is disposed on the inner wall of the pipe section of the front guard plate, and a metal moving ring is disposed on the outer wall of the extended section of the front guard plate. The metal moving ring and the metal fixed ring are fitted with a gap, and the gap is controlled at 2mm.

[0011] The beneficial effects of this utility model are as follows: This device embeds a metal ring at the connection between the pump impeller and the volute, which reduces the impeller clearance, reduces the overall volume loss and friction loss of the pump, enhances the service life of the pump, and reduces economic costs. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments of this utility model will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this utility model and are not intended to limit the scope of this utility model. Wherein:

[0013] Figure 1 This is a schematic diagram of a material for adjusting the clearance between the impeller and the volute of a water inlet pump.

[0014] Figure 2 for Figure 1 Enlarged diagram of point A in the middle.

[0015] The components are: 11. Pump body; 12. Pump cover; 13. Front guard plate; 14. Rear guard plate; 15. Sheath; 16. Impeller; 17. Metal fixed ring; 18. Metal rotating ring. Detailed Implementation

[0016] To enable those skilled in the art to better understand this utility model, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0017] The terminology used in this invention refers to those general terms currently widely used in the art in consideration of the functionality of this invention; however, these terms may vary according to the intent, precedent, or new technology of those skilled in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of this invention. Therefore, the terminology used in this specification should not be construed as simple names, but rather based on the meaning of the terms and the overall description of this invention.

[0018] This embodiment takes the influent pumping station of Taochong wastewater treatment plant as an example:

[0019] The Taochong wastewater treatment plant's influent pumping station has four pumps, three of which are variable frequency drives (VFDs) and one is a soft starter. The pump parameters are: Q=1800 m³ / h, H=23 m, 160 kW, 286.6 A. The pump flow rate has decreased due to impeller wear. The current pump flow rates are as follows:

[0020]

[0021] The data revealed a significant issue: a decrease in the rated flow rate of the inlet pumps, with an average flow rate reduction of 20% per pump. These pumps were originally designed for a "three-in-one-out" operating mode, but due to insufficient flow, four pumps now need to be started simultaneously to meet production demands, resulting in a loss of backup redundancy. Furthermore, the flow rate reduction has also led to an increase in overall plant power consumption.

[0022] It was confirmed that there was no impeller cavitation in the inlet pump. The main reason for the reduced flow rate was severe wear of the gap between the pump casing and the impeller. The factory standard clearance for this equipment was 2mm, but the actual clearance of all four inlet pumps on site exceeded 20mm.

[0023] In response, this embodiment provides a gap adjustment structure between the pump impeller 16 and the volute, in which a metal ring is embedded at the connection between the pump impeller 16 and the volute, including a fixed metal ring 17 embedded inside the volute and a moving metal ring 18 embedded on the outer ring of the impeller 16.

[0024] It should be noted that the metal fixed ring 17 is installed after cooling to ensure tightness, and the metal moving ring 18 is installed after heating to ensure tightness.

[0025] The volute includes an outer shell and an inner shell;

[0026] The outer casing includes a pump body 11 and a pump cover 12, with the pump body 11 connected to the pump cover 12 by bolts.

[0027] The inner housing includes a front guard plate 13, a rear guard plate 14, and a sleeve 15. The front guard plate 13 is bolted to the pump cover 12, and the rear guard plate 14 is bolted to the pump body 11. The front guard plate 13, the rear guard plate 14, and the sleeve 15 abut against each other.

[0028] The combination of an outer shell and an inner shell results in low replacement costs after wear.

[0029] The front guard plate 13 is bent towards the pump inlet and has a pipe section. The outer ring of the impeller 16 extends along the front guard plate 13 and is the same length as the pipe section. The metal fixed ring 17 is set on the inner wall of the pipe section of the front guard plate 13, and the metal moving ring 18 is set on the outer wall of the extended section of the front guard plate 13. The metal moving ring 18 and the metal fixed ring 17 are fitted with a clearance of 2mm.

[0030] The longer planar extensions of the front guard plate 13 and the outer ring of the impeller 16 facilitate the embedding of the metal rings. Furthermore, in this embodiment, the embedding surfaces of the metal moving ring 18 and the metal fixed ring 17 are relatively wide, and both the metal moving ring 18 and the metal fixed ring 17 are also designed with a relatively wide width. Partial wear does not affect the overall 2mm gap control, resulting in greater wear resistance.

[0031] By modifying the water pump impeller, the equipment can be fully restored to its factory parameters. After comparison before and after the modification, the power consumption was reduced by 15.03% and 3.31% respectively. See the energy consumption comparison table for details.

[0032]

[0033] By modifying the pump impeller, the equipment has been fully restored to its factory performance and is operating stably, effectively ensuring the redundant operation mechanism of "three pumps in use and one pump in standby" in the plant area.

[0034] The plan is to gradually upgrade the remaining two water pumps. Based on the actual effect of the two pumps that have already been upgraded, which have reduced electricity consumption by an average of 9%, it is estimated that the upgrade of the two-day intake pump impeller will save 300,000 yuan in electricity costs for the intake pumps annually.

[0035] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of this utility model.

Claims

1. A structure for adjusting the clearance between the impeller and the volute of an inlet pump, characterized in that, A metal ring is inlaid at the connection between the pump impeller and the volute, including a fixed metal ring inlaid inside the volute and a moving metal ring inlaid on the outer ring of the impeller; The volute includes an outer shell and an inner shell; The outer casing includes a pump body and a pump cover, with the pump body connected to the pump cover by bolts; The inner housing includes a front protective plate, a rear protective plate, and a protective sleeve. The front protective plate is bolted to the pump cover, and the rear protective plate is bolted to the pump body. The front protective plate, the rear protective plate, and the protective sleeve abut against each other. The front guard plate is bent towards the pump inlet and has a pipe section. The outer ring of the impeller extends along the front guard plate and is the same length as the pipe section. A metal fixed ring is set on the inner wall of the pipe section of the front guard plate, and a metal moving ring is set on the outer wall of the extended section of the front guard plate. The metal moving ring and the metal fixed ring are fitted with a gap, and the gap is controlled at 2mm.

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