Zero-leakage, easy-to-maintain, high-efficiency slurry pump

Abstract

The application discloses a kind of zero leakage easy maintenance high efficiency slurry pump, including bearing box assembly connected with main shaft, the front end of main shaft is connected with impeller part, the front end and rear end of impeller part are respectively matched with front baffle assembly, rear baffle assembly cooperation, the radial side of impeller part is provided with volute assembly with front baffle assembly, rear baffle assembly cooperation, the end of impeller facing front baffle, first annular front cover plate, second annular front cover plate, first friction pair, second friction pair, the area formed by front baffle forms front high-pressure cavity, the end of impeller facing rear baffle, first annular rear cover plate, second annular rear cover plate, third friction pair, fourth friction pair, the area formed by rear baffle forms rear high-pressure cavity.The application eliminates the secondary impeller and back blade of traditional slurry pump, cancels mechanical seal, realizes self-sealing by the floating friction pair of front baffle assembly, rear baffle assembly and impeller front and rear cover plate, and clean water is introduced in double seal, realizes lubrication and cooling of impeller friction pair.

Description

Technical Field

[0001] This invention relates to the field of slurry pump technology, and in particular to a zero-leakage, easy-to-maintain, high-efficiency slurry pump. Background Technology

[0002] Traditional heavy-duty slurry pump structures (such as) Figure 1 The pump body comprises a shaft 1, bearing assembly 2, shaft sleeve 3, packing gland 4, stuffing box 5, auxiliary impeller 6, rear guard plate 7, pump body 8, outlet short pipe 9, sheath 10, impeller 11, pump cover 12, front guard plate 13, and inlet short pipe 14. The impeller 11 has back blades on both sides that cooperate with the front guard plate 13 and rear guard plate 7 of the pump body, primarily to balance axial force and reduce slurry leakage. During slurry transport, the pressure difference causes the slurry to easily wear down the back blades of the impeller's front and rear guard plates and the pump body's front and rear guard plates, leading to pump failure. In applications with high slurry concentrations, the pump's flow components need replacement in less than a month, seriously threatening safe production and increasing the workload and maintenance costs. Traditional slurry pump shaft seals use auxiliary impellers with packing seals or mechanical seals. Mechanical friction results in significant power loss, and the packing and mechanical seals are easily damaged during pump operation, leading to substantial pump maintenance. In addition, the shaft adopts an integrated design, which makes maintenance between the pump body and the bearing housing assembly very inconvenient. Summary of the Invention

[0003] The purpose of this invention is to address the aforementioned shortcomings and defects of the prior art by providing a zero-leakage, easy-to-maintain, and high-efficiency slurry pump to solve the above-mentioned problems.

[0004] The technical problem solved by this invention can be achieved by the following technical solutions:

[0005] A zero-leakage, easy-to-maintain, high-efficiency slurry pump includes a bearing housing assembly connected to a main shaft. The front end of the main shaft is connected to an impeller section. The front and rear ends of the impeller section respectively mate with a front guard plate assembly and a rear guard plate assembly. A volute assembly is provided on the radial side of the impeller section to mate with the front and rear guard plate assemblies.

[0006] The front guard plate assembly includes a front guard plate. A first inner annular groove and a first outer annular groove are provided at one end of the front guard plate facing the impeller. An inlet and an outlet are provided on the front guard plate between the first inner and outer annular grooves. A first friction pair is provided on the first inner annular groove via a first elastic component, and a second friction pair is provided on the first outer annular groove via a second elastic component.

[0007] The rear guard plate assembly includes a rear guard plate. A second inner annular groove and a second outer annular groove are provided at one end of the rear guard plate facing the impeller. An inlet and an outlet are provided on the rear guard plate between the second inner and outer annular grooves. A third friction pair is provided on the second inner annular groove via a third elastic component, and a fourth friction pair is provided on the second outer annular groove via a fourth elastic component.

[0008] The impeller section includes an impeller, and a first annular front cover plate corresponding to the first friction pair and a second annular front cover plate corresponding to the second friction pair are fixedly disposed at the end of the impeller facing the front guard plate. The area enclosed by the end of the impeller facing the front guard plate, the first annular front cover plate, the second annular front cover plate, the first friction pair, the second friction pair, and the front guard plate forms a front high-pressure cavity.

[0009] The impeller facing the rear guard plate is fixedly provided with a first annular rear cover plate corresponding to the third friction pair and a second annular rear cover plate corresponding to the fourth friction pair. The area enclosed by the impeller facing the rear guard plate, the first annular rear cover plate, the second annular rear cover plate, the third friction pair, the fourth friction pair, and the rear guard plate forms the rear high-pressure cavity.

[0010] In a preferred embodiment of the present invention, a first annular retaining ring is provided on the side of the first friction pair facing the first annular front cover plate near the front high-pressure cavity, a second annular retaining ring is provided on the side of the second friction pair facing the second annular front cover plate near the front high-pressure cavity, a third annular retaining ring is provided on the side of the third friction pair facing the first annular rear cover plate near the rear high-pressure cavity, and a fourth annular retaining ring is provided on the side of the fourth friction pair facing the second annular rear cover plate near the rear high-pressure cavity.

[0011] In a preferred embodiment of the present invention, the first annular front cover plate, the second annular front cover plate, the first annular rear cover plate, and the second annular rear cover plate are provided with a wear-resistant coating.

[0012] In a preferred embodiment of the present invention, the liquid pressure in the front high-pressure chamber and the rear high-pressure chamber is higher than the operating point pressure of the impeller section during normal operation.

[0013] In a preferred embodiment of the present invention, the liquid pressure in the front high-pressure chamber and the rear high-pressure chamber is the operating point pressure of the impeller section during normal operation plus 0.2 MPa.

[0014] In a preferred embodiment of the present invention, a sealing ring is provided between the first friction pair and the side wall of the first inner annular groove, a sealing ring is provided between the second friction pair and the side wall of the first outer annular groove, a sealing ring is provided between the third friction pair and the side wall of the second inner annular groove, and a sealing ring is provided between the fourth friction pair and the side wall of the second outer annular groove.

[0015] In a preferred embodiment of the present invention, the first elastic component, the second elastic component, the third elastic component, and the fourth elastic component include springs.

[0016] In a preferred embodiment of the present invention, the first annular front cover plate has a first arc-shaped surface recessed towards the impeller on the side facing the front high-pressure cavity, the second annular front cover plate has a second arc-shaped surface recessed towards the impeller on the side facing the front high-pressure cavity, the first annular rear cover plate has a third arc-shaped surface recessed towards the impeller on the side facing the rear high-pressure cavity, and the fourth annular rear cover plate has a fourth arc-shaped surface recessed towards the impeller on the side facing the rear high-pressure cavity.

[0017] In a preferred embodiment of the present invention, the front end of the main shaft is connected to the impeller via a split coupling.

[0018] In a preferred embodiment of the present invention, the tail end of the rear guard plate is connected to the bearing housing assembly housing by fasteners.

[0019] By employing the above technical solution, this invention eliminates the auxiliary impeller and back blades of traditional slurry pumps, and removes the mechanical seal (or packing seal). Self-sealing is achieved through floating friction pairs between the front and rear guard plate assemblies and the front and rear impeller cover plates. Clean water is circulated through the double seal to lubricate and cool the impeller friction pairs, ensuring no slurry friction between the front and rear impeller cover plates and the pump body's front and rear guard plates. This simplifies the structure of the two-phase flow pump and improves its efficiency. Furthermore, the use of a split rigid connection for the shaft allows for quick disassembly of the slurry pump head or bearing housing assembly, improving on-site maintenance efficiency. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a structural schematic diagram of a heavy-duty slurry pump in the prior art.

[0022] Figure 2 This is a schematic diagram of the structure of one embodiment of the present invention.

[0023] Figure 3 This is a side view of one embodiment of the present invention.

[0024] Figure 4 yes Figure 2 A magnified view of section I.

[0025] Figure 5 yes Figure 4 Enlarged view of point a.

[0026] Figure 6 yes Figure 4 Enlarged view of point b.

[0027] Figure 7 yes Figure 4 Enlarged view of point c.

[0028] Figure 8 yes Figure 4 Enlarged view of point d. Detailed Implementation

[0029] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention is further described below.

[0030] See Figures 2 to 8 The illustrated zero-leakage, easy-to-maintain, high-efficiency slurry pump includes a bearing housing assembly 200 connected to a main shaft 100, and the front end of the main shaft 100 is connected to an impeller portion 300. Preferably, in this embodiment, the front end of the main shaft 100 and the impeller portion 300 are connected by a split coupling 400, which allows for quick disassembly of the slurry pump head or the bearing housing assembly, improving on-site maintenance efficiency.

[0031] The front end and rear end of the impeller section 300 are respectively engaged with the front guard plate assembly 500 and the rear guard plate assembly 600. The radial side of the impeller section 300 is provided with a volute assembly 700 that is engaged with the front guard plate assembly 500 and the rear guard plate assembly 600.

[0032] The front guard plate assembly 500 includes a front guard plate 510. The front guard plate 510 has an inlet 511 in its middle. A first inner annular groove 520 and a first outer annular groove 530 are provided at one end of the front guard plate 510 facing the impeller section 300. An inlet 512 and an outlet 513 are provided on the front guard plate 510 between the first inner annular groove 520 and the first outer annular groove 530. A first friction pair 550 is provided on the first inner annular groove 520 via a first elastic component 540, and a second friction pair 570 is provided on the first outer annular groove 530 via a second elastic component 560. The impeller section 300 includes an impeller 310, which has a radial slurry flow channel 311. The impeller 310 is fixedly provided with a first annular front cover plate 580 corresponding to the first friction pair 550 and a second annular front cover plate 590 corresponding to the second friction pair 570 at one end facing the front guard plate 510. The area enclosed by the impeller 310 at one end facing the front guard plate 510, the first annular front cover plate 580, the second annular front cover plate 590, the first friction pair 550, the second friction pair 570, and the front guard plate 510 forms the front high-pressure cavity H1.

[0033] The rear guard plate assembly 600 includes a rear guard plate 610, the tail end of which is connected to the bearing housing assembly housing via fasteners. The rear guard plate 610 has a second inner annular groove 620 and a second outer annular groove 630 at its end facing the impeller portion 300. An inlet and an outlet are located between the second inner annular groove 620 and the second outer annular groove 630 on the rear guard plate 610. A third friction pair 650 is provided on the second inner annular groove 620 via a third elastic component 640, and a fourth friction pair 670 is provided on the second outer annular groove 630 via a fourth elastic component 660. The impeller 310 is fixedly provided with a first annular rear cover plate 680 corresponding to the third friction pair 650 and a second annular rear cover plate 690 corresponding to the fourth friction pair 670 at one end facing the rear guard plate 610. The area enclosed by the impeller 310 at one end facing the rear guard plate 610, the first annular rear cover plate 680, the second annular rear cover plate 690, the third friction pair 650, the fourth friction pair 670, and the rear guard plate 610 forms the rear high-pressure cavity H2.

[0034] In this embodiment, a first annular retaining ring 551 is provided on the side of the first friction pair 550 facing the first annular front cover plate 580 near the front high-pressure chamber H1; a second annular retaining ring 571 is provided on the side of the second friction pair 570 facing the second annular front cover plate 590 near the front high-pressure chamber H1; a third annular retaining ring 651 is provided on the side of the third friction pair 650 facing the first annular rear cover plate 680 near the rear high-pressure chamber H2; and a fourth annular retaining ring 671 is provided on the side of the fourth friction pair 670 facing the second annular rear cover plate 690 near the rear high-pressure chamber H2. When high-pressure water is injected into the front high-pressure chamber H1 and the rear high-pressure chamber H2, the high-pressure water applies a portion of the axial pressure to the first annular retaining ring 551, the second annular retaining ring 571, the third annular retaining ring 651, and the fourth annular retaining ring 671, increasing the axial pressure of the first friction pair 550, the second friction pair 570, the third friction pair 650, and the fourth friction pair 670, further ensuring sealing.

[0035] The first annular front cover plate 580 has a first arc-shaped surface 581 recessed towards the impeller 310 on the side facing the front high-pressure cavity H1; the second annular front cover plate 590 has a second arc-shaped surface 591 recessed towards the impeller 310 on the side facing the front high-pressure cavity H1; the first annular rear cover plate 680 has a third arc-shaped surface 681 recessed towards the impeller 310 on the side facing the rear high-pressure cavity H2; and the fourth annular rear cover plate 690 has a third arc-shaped surface 581 recessed towards the impeller 310 on the side facing the rear high-pressure cavity H2. The fourth arc-shaped surface 691 of the directional impeller 310 is recessed. When high-pressure water is injected into the front high-pressure chamber H1 and the rear high-pressure chamber H2, the high-pressure water applies a portion of the axial pressure to the first arc-shaped surface 581, the second arc-shaped surface 591, the third arc-shaped surface 681, and the fourth arc-shaped surface 691, thereby increasing the axial pressure of the first annular front cover plate 580, the second annular front cover plate 590, the first annular rear cover plate 680, and the fourth annular rear cover plate 690, and further ensuring the sealing performance.

[0036] The first annular front cover plate 580, the second annular front cover plate 590, the first annular rear cover plate 680, and the fourth annular rear cover plate 690 are provided with wear-resistant coatings to further ensure sealing.

[0037] During operation, the liquid pressure in the front high-pressure chamber H1 and the rear high-pressure chamber H2 is higher than the operating point pressure of the impeller section 300 during normal operation. Preferably, the liquid pressure in the front high-pressure chamber H1 and the rear high-pressure chamber H2 is the operating point pressure of the impeller section 300 during normal operation plus 0.2 MPa. Therefore, the slurry environment in the pump body forms a relatively low pressure, while the environment in the front high-pressure chamber H1 and the rear high-pressure chamber H2 forms a relatively high pressure. During normal operation, the slurry in the pump body will not leak through the front high-pressure chamber H1 and the rear high-pressure chamber H2.

[0038] A sealing ring 521 is provided between the first friction pair 550 and the side wall of the first inner annular groove 520; a sealing ring 531 is provided between the second friction pair 570 and the side wall of the first outer annular groove 530; a sealing ring 621 is provided between the third friction pair 650 and the side wall of the second inner annular groove 620; and a sealing ring 631 is provided between the fourth friction pair 670 and the side wall of the second outer annular groove 630. The sealing rings serve a sealing function to prevent slurry from entering the annular grooves and affecting the normal operation of the friction pairs. The first elastic component 540, the second elastic component 560, the third elastic component 640, and the fourth elastic component 660 all include springs. The springs are sleeved on guide posts at the tail of the friction pairs, and movable grooves for the guide posts to move are provided corresponding to the positions where the friction pairs are located.

[0039] The working principle of this invention is as follows:

[0040] During normal operation, first connect the pipeline and fill the front high-pressure chamber H1 and rear high-pressure chamber H2 with high-pressure water through the inlets on the front guard plate 510 and rear guard plate 610. Open the inlet valve to fill the pump with the pumping slurry. The pump operates normally, creating a relatively low-pressure environment for the slurry inside the pump body, while creating a relatively high-pressure environment for the front high-pressure chamber H1 and rear high-pressure chamber H2. The slurry inside the pump body will not leak through the front high-pressure chamber H1 and rear high-pressure chamber H2. The high-pressure cooling water injected in the middle forms two seals, ensuring zero slurry leakage and increasing the volumetric efficiency to 100%. The total pump efficiency η = η m *η v *η h , where η m Mechanical efficiency, η v Volumetric efficiency, η h Hydraulic efficiency.

[0041] The model selection of this invention can be determined according to the required flow rate and head. When installing the pump, first install the bearing housing assembly 200, then connect the impeller part 300 to the main shaft 100 through the split coupling 400, tighten the connecting bolts, then connect the assembled rear guard plate assembly 600 to the bracket body of the bearing housing assembly 200 through double-ended bolts, install the impeller 310, lock it, then hoist the volute assembly 700, tighten the connecting bolts, then lock the assembled front guard plate assembly 500 to the volute flange face, and finally install the external high-pressure water.

[0042] This invention eliminates the auxiliary impeller and back blades of traditional pumps, significantly improving hydraulic and mechanical efficiency, and solving the axial force balance problem, thus enhancing bearing reliability. This invention also eliminates the mechanical seal (or packing seal), reducing pump components. A special design between the impeller and pump body creates a self-sealing seal, and high-pressure clean water is used to lubricate and cool the friction pairs, significantly improving pump volumetric efficiency and providing high reliability. It also solves the wear problems of the front and rear cover plates and front and rear guard plates in traditional slurry pumps, reducing the number of vulnerable parts and saving on maintenance costs and repair cycles.

[0043] The present invention relates to replacing easily worn parts of the pump head, comprising the following steps:

[0044] 1. Shut down the unit and disconnect the power supply to the unit;

[0045] 2. Close the inlet and outlet valves of the unit, ensuring that the valves are undamaged when closing them;

[0046] 3. Close the valve on the external water pipe;

[0047] 4. Loosen the connecting bolts of the inlet and outlet cone pipes to drain the liquid from the pump head;

[0048] 5. Loosen the connection between the external water pipe and the external water assembly to completely separate them;

[0049] 6. Use a crane to lift the pump head and keep it in its current position;

[0050] 7. Loosen the bolts connecting the pump head and the bracket body;

[0051] 8. Loosen the connecting screws of the split coupling and remove the split coupling;

[0052] 9. Use a crane to lift the pump head out. During the lifting process, move it gently in short bursts. After ensuring that the pump head is completely separated from the bracket body, move it to the side.

[0053] 10. Install the vulnerable parts one by one according to the assembly steps. The pump head that is removed can be reused depending on the degree of damage.

[0054] 11. After checking that everything is correct, open the water supply pipeline valve to fill the pump head and sealing cavity with water. Then check that there are no drips or leaks on the sealing surfaces of the slurry pump before starting the machine.

[0055] The present invention relates to replacing easily worn parts of a bearing housing, comprising the following steps:

[0056] 1. Shut down the unit and disconnect the power supply to the unit;

[0057] 2. Loosen the bolts connecting the bearing cap and the bearing housing;

[0058] 3. Loosen the bolts connecting the bearing body and the bearing housing;

[0059] 4. Loosen the bolts connecting the bearing housing cover and the bracket body;

[0060] 5. Loosen the connecting screws of the split coupling and remove the split coupling;

[0061] 6. Use a crane to lift the bearing housing cover out. During the lifting process, move it gently in small increments. After ensuring that the bearing housing cover is completely separated from the bracket body, move it to the side.

[0062] 7. Use a crane to remove the rotor from the bearing housing;

[0063] 8. Repair or replace damaged parts;

[0064] 9. Reassemble each component one by one according to the disassembly steps;

[0065] 10. Only after checking that everything is correct can the machine be turned on.

[0066] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A zero-leakage, easy-to-maintain, high-efficiency slurry pump, comprising a bearing housing assembly connected to a main shaft, wherein the front end of the main shaft is connected to an impeller section, the front end and rear end of the impeller section respectively mate with a front guard plate assembly and a rear guard plate assembly, and a volute assembly mates with the front guard plate assembly and the rear guard plate assembly on the radial side of the impeller section, characterized in that, The front guard plate assembly includes a front guard plate. A first inner annular groove and a first outer annular groove are provided at one end of the front guard plate facing the impeller. An inlet and an outlet are provided on the front guard plate between the first inner and outer annular grooves. A first friction pair is provided on the first inner annular groove via a first elastic component, and a second friction pair is provided on the first outer annular groove via a second elastic component. The rear guard plate assembly includes a rear guard plate. A second inner annular groove and a second outer annular groove are provided at one end of the rear guard plate facing the impeller. An inlet and an outlet are provided on the rear guard plate between the second inner and outer annular grooves. A third friction pair is provided on the second inner annular groove via a third elastic component, and a fourth friction pair is provided on the second outer annular groove via a fourth elastic component. The impeller section includes an impeller, and a first annular front cover plate corresponding to the first friction pair and a second annular front cover plate corresponding to the second friction pair are fixedly disposed at the end of the impeller facing the front guard plate. The area enclosed by the end of the impeller facing the front guard plate, the first annular front cover plate, the second annular front cover plate, the first friction pair, the second friction pair, and the front guard plate forms a front high-pressure cavity. The impeller facing the rear guard plate is fixedly provided with a first annular rear cover plate corresponding to the third friction pair and a second annular rear cover plate corresponding to the fourth friction pair. The area enclosed by the impeller facing the rear guard plate, the first annular rear cover plate, the second annular rear cover plate, the third friction pair, the fourth friction pair, and the rear guard plate forms the rear high-pressure cavity.

2. The zero-leakage, easy-to-maintain, high-efficiency slurry pump as described in claim 1, characterized in that, The first friction pair has a first annular retaining ring on the side of the first annular front cover plate near the front high-pressure cavity, the second friction pair has a second annular retaining ring on the side of the second annular front cover plate near the front high-pressure cavity, the third friction pair has a third annular retaining ring on the side of the first annular rear cover plate near the rear high-pressure cavity, and the fourth friction pair has a fourth annular retaining ring on the side of the second annular rear cover plate near the rear high-pressure cavity.

3. The zero-leakage, easy-to-maintain, high-efficiency slurry pump as described in claim 1, characterized in that, The first annular front cover plate, the second annular front cover plate, the first annular rear cover plate, and the second annular rear cover plate are provided with wear-resistant coatings.

4. The zero-leakage, easy-to-maintain, high-efficiency slurry pump as described in claim 1, characterized in that, The liquid pressure in the front high-pressure chamber and the rear high-pressure chamber is higher than the operating pressure of the impeller section during normal operation.

5. The zero-leakage, easy-to-maintain, high-efficiency slurry pump as described in claim 4, characterized in that, The liquid pressure in the front high-pressure chamber and the rear high-pressure chamber is the operating point pressure of the impeller section during normal operation plus 0.2 MPa.

6. The zero-leakage, easy-to-maintain, high-efficiency slurry pump as described in claim 1, characterized in that, A sealing ring is provided between the first friction pair and the side wall of the first inner annular groove; a sealing ring is provided between the second friction pair and the side wall of the first outer annular groove; a sealing ring is provided between the third friction pair and the side wall of the second inner annular groove; and a sealing ring is provided between the fourth friction pair and the side wall of the second outer annular groove.

7. The zero-leakage, easy-to-maintain, high-efficiency slurry pump as described in claim 1, characterized in that, The first elastic component, the second elastic component, the third elastic component, and the fourth elastic component all include springs.

8. The zero-leakage, easy-to-maintain, high-efficiency slurry pump as described in claim 1, characterized in that, The first annular front cover plate has a first arc-shaped surface recessed towards the impeller on the side facing the front high-pressure cavity, the second annular front cover plate has a second arc-shaped surface recessed towards the impeller on the side facing the front high-pressure cavity, the first annular rear cover plate has a third arc-shaped surface recessed towards the impeller on the side facing the rear high-pressure cavity, and the second annular rear cover plate has a fourth arc-shaped surface recessed towards the impeller on the side facing the rear high-pressure cavity.

9. The zero-leakage, easy-to-maintain, high-efficiency slurry pump as described in claim 1, characterized in that, The front end of the main shaft is connected to the impeller section via a split coupling.

10. The zero-leakage, easy-to-maintain, high-efficiency slurry pump as described in claim 1, characterized in that, The rear end of the rear guard plate is connected to the bearing housing assembly housing by fasteners.

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