Wear-resistant centrifugal pump

Abstract

The utility model relates to the technical field of centrifugal pumps, in particular to a wear-resistant centrifugal pump which comprises a pump body, and a sealing box is arranged at the joint of a pump shaft and a motor to protect the motor. A plurality of layers of partition plates are arranged in the pump body, and pressurizing holes are formed between the multiple layers of partition plates and the sealing box; the pressurizing hole is communicated with an external cleaning fluid conveying pipeline, and cleaning fluid with the pressure larger than the working pressure of the pump can be conveyed into the volute. Through cooperative work of the multiple layers of partition plates and the pressurizing holes, water flow opposite to the sealing box in direction can be stably generated, and sealing box abrasion caused by contact of solid particles in a conveying medium and the sealing box is avoided, so that the service life of the sealing box is prolonged, the maintenance period is prolonged, the maintenance cost of the centrifugal pump is reduced, and production continuity is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal pumps, in particular to a wear-resistant centrifugal pump. Background Art

[0002] In the petrochemical field, centrifugal pumps are often used to transport fluids containing solid media. In order to prevent solid particles from entering and wearing the centrifugal pump, a sealing box is often set to isolate the volute part from the motor seal; however, the mating surface between the shaft and the sealing box will be severely worn due to solid particles, which reduces the service life of the sealing box. The sealing box needs to be replaced frequently to avoid leakage that may cause damage to the motor, shortening the maintenance cycle of the centrifugal pump, increasing maintenance costs, and affecting production continuity.

[0003] There is a patent with application number 201520328991.6, which discloses an external flushing self-balancing centrifugal pump, including a suction section, a middle section, an intermediate section, a transition section, and a pump shaft. A mechanical sealing mechanism, a bearing mechanism, and an impeller are installed on the pump shaft. An intermediate section external flushing hole is provided on the intermediate section, and a sleeve external flushing hole is provided on the intermediate sleeve between the intermediate section and the pump shaft. The patent uses high-pressure flushing to prevent solid particles from entering the gap between the intermediate sleeve and the intermediate shaft sleeve between the intermediate section and the pump shaft, thereby slowing down the wear rate of both by solid particles. However, the patent requires the use of a high-pressure pipeline to continuously flush the pump shaft and the intermediate section, which will increase the stress on the pump shaft, accelerate the fatigue of the pump shaft, and increase the risk of deformation and fracture of the pump shaft. Utility Model Content

[0004] The utility model aims to provide a wear-resistant centrifugal pump which can reduce the wear of the sealing box and protect the pump shaft.

[0005] Based on the above purpose, the utility model adopts the following technical solutions:

[0006] A wear-resistant centrifugal pump comprises a pump body, the pump body comprises a volute, an axial hole is axially arranged in the volute, and a pump shaft is arranged through the axial hole; a motor is connected to one end of the pump shaft, a sealing box is arranged in the axial hole of the volute at one end connected to the motor, and the sealing box is sleeved on the pump shaft; a mounting position is arranged at the other end of the axial hole of the volute, and a multi-layer partition is fixedly installed in the mounting position; a pressurizing hole is arranged on the volute, and the pressurizing hole is connected to the axial hole.

[0007] Preferably, the multi-layer partition includes a partition sleeve, which is a hollow cylindrical structure; a mounting structure that matches the mounting position is arranged on the outer side of the partition sleeve, and a plurality of partitions are arranged in parallel on the inner side of the partition sleeve.

[0008] Preferably, the partition is a circular ring structure with a through hole in the center, and the through hole is coaxially arranged with the pump shaft; the clearance between the through hole and the pump shaft is 1-5 mm.

[0009] Preferably, the mounting structure includes four fixing bolt holes evenly distributed along the central axis of the partition sleeve; the fixing bolt holes are arranged at one end where the multi-layer partition cooperates with the end face of the volute, and a screw hole cooperating with the fixing bolt hole is arranged on the end face of the volute.

[0010] Preferably, the installation structure includes a card slot fixing structure, which includes a card slot arranged on the outer side of the partition sleeve; four card slots are evenly distributed along the central axis of the partition sleeve, and the card slots are arranged along the length direction of the partition sleeve; a card block that cooperates with the card slot is arranged on the inner side surface of the installation position.

[0011] Preferably, the pressurizing hole is arranged between the multi-layer partition and the sealing box, and the pressurizing hole is connected to a cleaning fluid delivery pipeline; a plurality of pressurizing holes are evenly distributed along the central axis of the pump shaft.

[0012] The beneficial effects of the utility model are:

[0013] The utility model adopts a dual blocking method of partition blocking and backwashing to prevent the fluid medium passing through the impeller from entering the volute and causing wear to the sealing box; the partition adopts a multi-layer partition, and firstly the partition is used to prevent solid particles of larger volume from entering; through a pressurized hole connected to a clean fluid delivery pipeline, a clean fluid with a pressure slightly higher than the internal pressure of the volute when the pump is running is poured into the volute, and on the basis of not affecting the quality of the pump delivery medium, a pressure difference is generated inside the volute that is greater than the external pressure, so that the fluid medium can only flow outward from the gap between the partition and the pump shaft, and cannot generate a water flow flowing into the volute, thereby avoiding the problem of solid particles entering the interior of the volute, thereby reducing the wear of the sealing box, increasing the service life of the centrifugal pump, extending the maintenance cycle and reducing the maintenance cost.

[0014] The utility model adopts a combination of multi-layer partitions and back flushing, and uses the multi-layer partitions to greatly reduce the gap between the partition and the pump shaft, thereby reducing the flow demand of the clean fluid; since there is a cross-sectional area difference between the shaft hole and the gap between the partition and the shaft, the cross-sectional area of ​​the gap between the partition and the shaft is much smaller than the cross-sectional area of ​​the shaft hole; when the fluid flows from a pipeline with a large cross-sectional area into a pipeline with a small cross-sectional area, according to the Bernoulli principle, the pressure of the clean fluid in the shaft hole section with a larger cross-sectional area is greater, so that a greater pressure can be generated on the basis of the pipeline with the same flow rate, thereby reducing the flow and pressure requirements for the clean fluid delivery pipeline, reducing the cost of use, and achieving the effect of reducing costs and increasing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the front view of the utility model;

[0016] Figure 2 This is a front view of the multi-layer partition of the utility model;

[0017] Figure 3 It is a side view of the multi-layer partition of the utility model;

[0018] Figure 4 It is a side sectional view of the internal structure of the volute of the utility model.

[0019] In the figure: pump body 1; multi-layer partition 2; fixing bolt hole 21; slot 22; partition 23; partition sleeve 24; pump shaft 3; shaft-plate gap 4; volute 5; pressurizing hole 51; shaft hole 52; fixing bolt 6; sealing box 7. DETAILED DESCRIPTION

[0020] The following is a further explanation of the present invention in conjunction with specific embodiments. Figure 1 As shown, this embodiment is a centrifugal pump, including a pump body 1; a multi-layer partition plate 2 structure is arranged on the volute 5 of the pump body 1, and the multi-layer partition plate 2 is arranged at one end of the pump shaft 3 connected to the impeller, and is installed inside the volute 5 to prevent solid particles in the fluid medium from entering the volute 5.

[0021] The multi-layer partition 2 is sleeved on the outside of the pump shaft 3 and is coaxially arranged with the pump shaft 3; the volute 5 is provided with a mounting position that matches the structure of the multi-layer partition 2, specifically a circular blind hole structure, which is coaxially arranged with the shaft hole structure accommodating the pump shaft 3, and the multi-layer partition 2 can be inserted into the mounting position for installation; the multi-layer partition 2 is fixed by a variety of fixing methods. In this embodiment, a method including bolt fixing and slot fixing is used, and a plurality of fixing bolt holes 21 and slots 22 are respectively provided on the multi-layer partition 2; Figure 2 As shown, four fixing bolt holes 21 and four clamping slots 22 are evenly distributed around the central axis of the pump shaft 3, and threaded holes and clamping block structures matching the four fixing bolt holes 21 and the clamping slots 22 are also respectively provided on the installation position of the volute 5.

[0022] like Figure 3 As shown, the multi-layer partition 2 includes a plurality of partitions 23 arranged in parallel, and a through hole is provided at the center of the partition 23 for the pump shaft 3 to pass through; the outer sides of the plurality of partitions 23 of the multi-layer partition 2 are surrounded by a cylindrical partition sleeve 24, the card groove 22 is provided on the outer surface of the partition sleeve 24, and the partition 23 is fixedly provided inside the partition sleeve 24; the inner diameter of the through hole of the partition 23 is larger than the diameter of the pump shaft 3, so that there is a shaft plate gap 4 between the two, and the size of the shaft plate gap 4 is 1-5mm.

[0023] The structure when the multi-layer partition 2 is installed inside the volute 5 is as follows Figure 4As shown, an axial hole 52 is axially arranged in the volute 5, and the pump shaft 3 is arranged through the axial hole 52, with its left end connected to the impeller and the right end connected to the motor; a sealing box 7 is arranged at the motor end of the axial hole 52, and a mounting position is arranged at the impeller end, and the multi-layer partition 2 is installed in the mounting position; a threaded hole matching with the fixing bolt hole position 21 is arranged at the end face of the mounting position, and the multi-layer partition 2 can be fixedly installed at the mounting position by the fixing bolt 6; a block structure matching with the slot 22 is arranged on the inner side wall of the mounting position, and when the multi-layer partition 2 is pushed into the mounting position, the block structure matches with the slot 22, and the multi-layer partition 2 is fixedly set in the mounting position; the multiple mounting and fixing structures ensure that the connection between the multi-layer partition 2 and the volute 5 is firm, and it is not easy to loosen or fall off during the operation of the pump.

[0024] like Figure 4 As shown, a pressurizing hole 51 is opened on the volute 5, and the pressurizing hole 51 is connected to an external clean fluid delivery pipeline, so that a clean fluid that does not affect the quality of the fluid medium delivered by the centrifugal pump can be provided from the outside; the pressurizing hole 51 is arranged between the multi-layer partition 2 and the sealing box 7, and the clean fluid pressure provided by it is slightly higher than the internal pressure of the volute when the pump is running; because the inner diameter of the shaft hole 52 is larger than the shaft plate gap 4, the clean fluid will always have a higher pressure at the shaft hole 52 than at the shaft plate gap 4 during the process of entering the shaft plate gap 4 from the shaft hole 52 due to the Bernoulli principle, so that the flow direction of the clean fluid is always to the left; in this way, solid particles in the conveying medium can be prevented from entering the volute 5 from left to right and generating friction with the sealing box 7.

[0025] The above description is only a further explanation of the present invention in combination with specific embodiments. All descriptions do not limit the protection scope of the present invention. Any changes or replacement solutions that can be easily thought of by technicians in this field within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A wear-resistant centrifugal pump, comprising a pump body, characterized in that: The pump body includes a volute, an axial hole is axially arranged in the volute, and a pump shaft is arranged through the axial hole; one end of the pump shaft is connected to a motor, and a sealing box is arranged at the end connected to the motor in the axial hole of the volute, and the sealing box is sleeved on the pump shaft; a mounting position is arranged at the other end of the axial hole of the volute, and a multi-layer partition is fixedly installed in the mounting position; a pressurizing hole is arranged on the volute, and the pressurizing hole is connected to the axial hole.

2. The wear-resistant centrifugal pump according to claim 1, characterized in that: The multi-layer partition includes a partition sleeve, which is a hollow cylindrical structure; a mounting structure that matches the mounting position is arranged on the outer side of the partition sleeve, and a plurality of partitions are arranged in parallel on the inner side of the partition sleeve.

3. The wear-resistant centrifugal pump according to claim 2, characterized in that: The partition is a circular ring structure with a through hole in the center, and the through hole is coaxially arranged with the pump shaft; the clearance between the through hole and the pump shaft is 1-5mm.

4. The wear-resistant centrifugal pump according to claim 3, characterized in that: The mounting structure includes four fixing bolt holes evenly distributed along the central axis of the partition sleeve; the fixing bolt holes are arranged at one end of the multi-layer partition that cooperates with the end face of the volute, and a screw hole that cooperates with the fixing bolt hole is arranged on the end face of the volute.

5. The wear-resistant centrifugal pump according to claim 3, characterized in that: The installation structure includes a card slot fixing structure, and the card slot fixing structure includes a card slot arranged on the outer side of the partition sleeve; four card slots are evenly distributed along the central axis of the partition sleeve, and the card slots are arranged along the length direction of the partition sleeve; a card block that cooperates with the card slot is arranged on the inner side surface of the installation position.

6. The wear-resistant centrifugal pump according to claim 1, characterized in that: The pressurizing hole is arranged between the multi-layer partition plate and the sealing box, and the pressurizing hole is connected to a clean fluid delivery pipeline; and a plurality of pressurizing holes are evenly distributed along the central axis of the pump shaft.

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