Middle protection plate structure of high-pressure centrifugal slurry pump with double-impeller structure

Abstract

The utility model discloses a middle guard plate structure of a high-pressure centrifugal slurry pump with a double-impeller structure. The slurry pump comprises a bracket component, a pump shaft and a pump head, the pump head comprises rotating parts including an impeller A, an impeller B and an auxiliary impeller, and fixed parts including a joint plate, a pump cover, a sealing box, a rear protection plate, a pump body A, a middle protection plate, a pump body B, a front protection plate and a support. A guide pipe 12 is connected between the slurry outlet of the pump body A and the suction inlet of the impeller B; an annular-belt-shaped groove is formed in the annular plate face, located on the side, facing the impeller A, of the middle protection plate and located on the two sides of the shaft hole, of the middle protection plate around the shaft hole, and blocking ribs which are evenly distributed in a radial mode with the shaft hole as the center are arranged in the annular-belt-shaped groove. According to the utility model, the flow velocity of slurry in the gap between the impeller A, the impeller B and the middle guard plate is effectively reduced, so that the abrasion to related parts is reduced, and the service life of the parts is prolonged; and the material consumption and the cost are reduced due to the manufacturing of the middle protection plate.

Description

Technical Field

[0001] The utility model relates to a middle guard plate structure of a high-pressure centrifugal slurry pump with a double-impeller structure. Technical Background

[0002] Centrifugal slurry pumps can be widely used in many industries such as metallurgy, steel, mining, dredging, coal, electricity, petroleum, building materials, environmental protection, water conservancy projects, etc. They are used to transport slurries containing different solid particles, which generally have abrasive effects on flow-through parts.

[0003] The head of the commonly used slurry pumps at present is usually no more than 90 meters. When conveying over long distances or at high altitudes, the slurry pump head is required to be higher. In the prior art, multiple single-stage pumps are often used in series to meet the high pressure requirements. As a result, there are many working stations and high shaft seal pressure. Mechanical seals are used for high-pressure seals, and peripheral supporting equipment is required, which has poor reliability, high cost, and complex maintenance and management.

[0004] The inventor applied for a utility model patent (patent number: 201420598619.2) in October 2014, which has been authorized. The advantage is that it can realize high-pressure slurry delivery without the need for peripheral shaft sealing equipment. This product is very popular in the market, but in actual use, we found that the patent still has technical deficiencies. That is, when the product is running, the slurry flows from impeller A to impeller B, and the pressure difference between the two ends is relatively large, resulting in a very high flow rate of slurry in the gap between impeller A, the middle guard plate, and impeller B. The high-speed slurry will also wear the related parts at a high speed, especially the wear on the gap between the hub and the middle guard plate of the two impellers will be relatively large, resulting in a significant reduction in the service life of these parts, and frequent maintenance and replacement is required. Utility Model Content

[0005] The technical purpose of the utility model is to provide a middle guard plate structure of a high-pressure centrifugal slurry pump with a double impeller structure. By improving the middle guard plate structure, the flow rate of the slurry in the gap between the impeller A, the middle guard plate, and the impeller B can be effectively reduced, thereby reducing the wear of the slurry on related parts and increasing the service life of the parts; it also reduces the weight of the middle guard plate, reduces the material used, and reduces the cost.

[0006] In order to achieve the above technical purpose, the technical solution adopted by the utility model is:

[0007] The utility model discloses a middle guard plate structure of a high-pressure centrifugal slurry pump with a double-impeller structure, wherein the high-pressure centrifugal slurry pump with a double-impeller structure comprises a bracket component, a pump shaft assembled on the bracket component, and a pump head with a double-impeller structure is installed on the right side of the bracket component; the pump head comprises a rotating component: an impeller A, an impeller B, and an auxiliary impeller, and a fixed part: a coupling plate, a pump cover, a sealing box, a rear guard plate, a pump body A, a middle guard plate, a pump body B, a front guard plate, and a bracket; a conduit 12 is connected between the slurry outlet of the pump body A and the suction port of the impeller B; the middle guard plate is installed on the pump shaft in a disc shape and is located between the impeller A and the impeller B, and is characterized in that: an annular groove is provided on the annular plate surface of the middle guard plate on the side of the middle guard plate located on both sides of the shaft hole facing the impeller A, and a radially evenly distributed blocking rib is provided in the annular groove with the shaft hole as the center.

[0008] Furthermore, the blocking ribs on the middle guard plate of the utility model are an integrally formed structure with the middle guard plate.

[0009] Furthermore, the number of the blocking ribs arranged on the middle guard plate of the utility model is at least six.

[0010] Furthermore, the height of the blocking ribs arranged on the middle guard plate of the utility model is flush with the board surface of the middle guard plate, and can also be slightly lower than the board surface of the middle guard plate but a certain height must be ensured.

[0011] The beneficial effects of the utility model are as follows: based on the technology of the original patented product, the utility model redesigns the structure of the middle guard plate, completely solving the previous problems. The utility model sets the side of the middle guard plate close to the impeller A as a lower groove, and evenly distributes radial blocking ribs of a certain height. The invention point is: when the pump is running, since the middle guard plate is provided with blocking ribs, it can effectively block and reduce the rotation speed of the slurry in the gap between the middle guard plate and the impeller A, thereby increasing the slurry pressure at the hub of the impeller A in this interval, so it can significantly reduce the pressure difference between the gaps at both ends of the impeller A hub and the impeller B hub, and the reduction in the pressure difference can greatly reduce the flow speed of the slurry in the gaps at both ends of the impeller A hub and the impeller B hub, and the reduction in the flow speed of the slurry in the gap can naturally greatly reduce the wear speed of the slurry on the impeller A and impeller B hubs and the middle guard plate in the gap, thereby increasing the service life of related parts, reducing the frequency of maintenance and replacement, and saving manpower and material resources. Moreover, the processing of the middle guard plate in this way saves materials, and the cost of the middle guard plate is of course reduced, and the price is lowered, which is beneficial to both manufacturers and customers. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic structural diagram of a high-pressure centrifugal slurry pump with a double impeller structure according to an embodiment of the utility model;

[0013] Figure 2It is a structural schematic diagram of the middle guard plate described in the embodiment of the utility model.

[0014] In the figure: 1. bracket component; 2. pump shaft; 3. joint plate; 4. pump cover; 5. rear guard plate; 6. impeller A; 7. pump body A; 8. middle guard plate; 8-1 shaft hole; 8-2 annular belt-shaped groove; 8-3 blocking rib; 9. front guard plate; 10. impeller B; 11 pump body B; 12. guide tube; 13. sealing box; 14. auxiliary impeller; 15. skeleton oil seal; 16. disassembly ring; 17. connecting bolt; 18. bracket. DETAILED DESCRIPTION

[0015] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only 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 present invention.

[0016] As attached Figure 1 , 2 The figure shows an embodiment of the impeller structure of a high-pressure centrifugal slurry pump with a double impeller structure of the utility model, wherein the high-pressure centrifugal slurry pump with a double impeller structure comprises a bracket component 1, a pump shaft 2 assembled on the bracket component 1, and a pump head with a double impeller structure is installed on the right side of the bracket component 1; the pump head comprises rotating components: impeller A6, impeller B10, auxiliary impeller 14, and fixed parts: joint plate 3, pump cover 4, sealing box 13, rear guard plate 5, pump body A7, middle guard plate 8, pump body B11, front guard plate 9, and bracket 18; in the pump body 7A A conduit 12 is connected between the slurry outlet and the suction port of the impeller B10; the middle guard plate 8 is in the shape of a disk and is installed on the pump shaft 2 through the shaft hole 8-1 in the center of the middle guard plate, and is located between the impeller A6 and the impeller B10. On the middle guard plate 8, on the side of the shaft hole 8-1 facing the impeller A, an annular groove 8-2 is provided on the annular plate surface of the middle guard plate on both sides of the shaft hole 8-1, and the annular groove 8-2 is provided with radially evenly distributed blocking ribs 8-3 centered on the shaft hole 8-1, and each blocking rib 8-3 is an integrally formed structure with the middle guard plate 8. At least six blocking ribs are provided on the middle guard plate of the utility model.

Claims

1. A middle guard plate structure of a high-pressure centrifugal slurry pump with a double impeller structure, the high-pressure centrifugal slurry pump with a double impeller structure comprising a bracket component, a pump shaft mounted on the bracket component, and a pump head with a double impeller structure mounted on the right side of the bracket component; the pump head comprises rotating components: impeller A, impeller B, auxiliary impeller, and fixed components: a joint plate, a pump cover, a sealing box, a rear guard plate, a pump body A, a middle guard plate, a pump body B, a front guard plate, and a bracket; a conduit (12) is connected between the slurry outlet of the pump body A and the suction port of the impeller B; the middle guard plate is in the shape of a disc and is mounted on the pump shaft through the axial hole in the center of the middle guard plate, and is located between the impeller A and the impeller B, characterized in that: On the annular plate surface of the middle guard plate on the side of the middle guard plate located on both sides of the shaft hole facing the impeller A, an annular groove is provided around the shaft hole, and blocking ribs are evenly distributed radially with the shaft hole as the center.

2. The middle guard plate structure of a high-pressure centrifugal slurry pump with a double impeller structure according to claim 1 is characterized by: The blocking ribs on the middle guard plate are an integrally formed structure with the middle guard plate.

3. The middle guard plate structure of a high-pressure centrifugal slurry pump with a double impeller structure according to claim 1 is characterized by: There are at least six blocking ribs arranged on the middle guard plate.

4. The middle guard plate structure of a high-pressure centrifugal slurry pump with a double impeller structure according to claim 1 is characterized by: The height of the blocking ribs arranged on the middle guard plate is flush with the plate surface of the middle guard plate, or lower than the plate surface height of the middle guard plate.

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