Single-shell cantilever slurry pump

Abstract

The utility model provides a single-shell type cantilever slurry pump which is characterized in that a bearing body (3) is fixed on the upper portion of a bracket body (4) through a lead screw assembly (14), a pump shaft (1) penetrates through an inner cavity of a first bearing assembly (2) and an inner cavity of a second bearing assembly (5) to be installed in the bearing body (3), and a pump cover (8) is fixed on the right side of the bracket body (4) through a pump cover connecting assembly (15). The mechanical seal gland (6) and the mechanical seal box (7) are fixed in an inner cavity of the pump cover (8) through screws, the protection plate (10) is installed on the right side of the pump cover (8) through a double-end stud, the left side end face of the volute (11) is matched with the protection plate (10), the outer edge of the volute (11) is fixed to the pump cover (8) through a volute connecting assembly (16), and the impeller (12) is installed at the tail end of the pump shaft (1) through threads of a hub of the impeller (12). And the auxiliary impeller (9) is arranged in a cavity between the mechanical seal box (7) and the protective plate (10). The device is simple in structure and convenient to manufacture, operate and maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of cantilever slurry pumps, in particular to a single-shell cantilever slurry pump. Background Art

[0002] The slurry pump uses the centrifugal force of the rotating impeller to throw the slurry from the center of the impeller to the outer edge of the impeller and into the volute cavity. The slurry slows down as the volute cavity gradually expands, and part of the kinetic energy is converted into static pressure energy, and finally flows into the conveying pipeline at a higher pressure. Therefore, the slurry pump is mainly used to convey slurry media containing solid particles, also known as a medium pump, and is widely used in slurry transportation in metallurgical ore dressing plants, hydraulic ash removal in thermal power plants, coal slurry and heavy medium transportation in coal washing plants, river dredging, river silt removal and other fields.

[0003] At present, most common slurry pumps are double-shell slurry pumps, that is, the pump body includes an inner shell composed of a front guard plate, a rear guard plate and a volute, and an outer shell composed of a front pump cover and a rear pump cover, wherein the inner shell forms a slurry conveying channel, and the outer shell is mainly used to fix and protect the inner shell. Although the double-shell slurry pump is relatively stable and reliable in terms of structure, it still has defects such as heavy product weight, inconvenient installation, disassembly and maintenance, and large amount of production materials, which greatly increases the production, manufacturing and operation and maintenance costs of the double-shell slurry pump. Although there are single-shell slurry pumps, such as the ceramic liner single-shell slurry pump (application number: 201420337540.4), a single-shell slurry pump including a ceramic liner and a protective shell adapted to the shape of the ceramic liner is proposed, which mainly describes the ceramic liner, the protective shell adapted to the shape of the ceramic liner, and the general structural form of the slurry pump, but the overall structural form of the slurry pump has not been reported, especially the installation and connection relationship between the bearing, the bearing body and the bracket, and the installation and connection relationship between the pump head and the bracket. A single-shell slurry pump with a sealing box-type joint plate (application number: 201520943644.4) forms a slurry sealing structure by setting a sealing box-type joint plate and a packing seal, which will seriously affect the service life of the sealing structure for conveying slurry containing solid particles. A single-shell slurry pump (application number: 201520838003.2) proposes a slurry pump in which the upper structure of the bracket is a partial bearing body structure, which increases the difficulty of manufacturing the bracket and also reduces the interchangeability of the device.

[0004] In view of this, on the one hand, in order to solve the defects of the double-shell slurry pump, on the other hand, to overcome the sealing and technical difficulties in production, manufacturing and operation and maintenance of the existing single-shell slurry pump, and to facilitate manufacturing, disassembly and maintenance, a single-shell cantilever slurry pump is urgently needed. Summary of the invention

[0005] The utility model proposes a single-shell cantilever slurry pump, which improves the maintainability and interchangeability of the device by integrally manufacturing a bearing body and separating it from a bracket body, improves the sealing performance of the device by cooperating with an auxiliary impeller and a mechanical seal, and overcomes the technical difficulties in sealing, manufacturing, and operation and maintenance of existing single-shell slurry pumps.

[0006] To achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a single-shell cantilever slurry pump comprises a pump shaft, a bearing assembly A, a bearing body, a bracket body, a bearing assembly B, a machine seal gland, a machine seal box, a pump cover, an auxiliary impeller, a guard plate, a volute and an impeller, wherein the bearing body is fixed to the upper part of the bracket body through a screw assembly, the bearing assembly A and the bearing assembly B are respectively installed on the left and right sides of the bearing body, the pump shaft passes through the inner cavity of the bearing assembly A and the bearing assembly B and is installed in the bearing body, the pump cover is fixed to the right side of the bracket body through a pump cover connecting assembly and the pump shaft passes through the pump cover connecting assembly Through the inner hole of the pump cover, the machine seal gland and the machine seal box are fixed in the inner cavity of the pump cover by screws, the mechanical seal is installed in the cavity between the machine seal gland and the machine seal box, the guard plate is installed on the right side of the pump cover through the studs, the left end face of the volute matches the guard plate, and the outer edge of the volute is fixed to the pump cover through the volute connecting assembly, the impeller is installed on the end of the pump shaft through the thread of its hub, the auxiliary impeller is fixed to the pump shaft through a common flat key and is in the cavity between the machine seal box and the guard plate, and the outlet short circuit is connected to the outlet flange of the volute through a flange.

[0007] Furthermore, the bearing assembly A includes a bearing gland A, a water retaining plate A, a clamping nut, a deep groove ball bearing and an oil retaining ring A, the longitudinal section of the oil retaining ring A is L-shaped, the right end face of the oil retaining ring A contacts the shoulder of the pump shaft, two deep groove ball bearings are installed side by side on the left side of the oil retaining ring A, a radial gap is set between the outer edges of the two deep groove ball bearings and the bearing body, the inner boss of the bearing gland A contacts the outer ring end face of the deep groove ball bearing, the bearing gland A is fixed to the left end face of the bearing body by bolts, the longitudinal section of the water retaining plate A is U-shaped, the water retaining plate A is installed on the pump shaft by interference fit, and the right end face of the water retaining plate A contacts the inner ring end face of the deep groove ball bearing, the clamping nut is installed on the bearing by threads and contacts the left end face of the water retaining plate.

[0008] Furthermore, the bearing assembly B includes a bearing cover B, a water retaining plate B, a disassembly ring, a spherical roller bearing and an oil retaining ring B, the longitudinal section of the oil retaining ring B is L-shaped, the left end face of the oil retaining ring B contacts the shoulder of the pump shaft, the spherical roller bearing is installed on the right side of the oil retaining ring B, a radial gap is set between the outer edge of the spherical roller bearing and the bearing body, the inner boss of the bearing cover B contacts the outer ring end face of the spherical roller bearing, the bearing cover B is fixed to the right end face of the bearing body by bolts, the longitudinal section of the water retaining plate B is U-shaped, the water retaining plate B is installed on the pump shaft by interference fit, and the left end face of the water retaining plate B contacts the inner ring end face of the spherical roller bearing, the disassembly ring is installed on the pump shaft and contacts the right end face of the water retaining plate B.

[0009] Furthermore, the screw assembly includes a screw and a nut, and there are 3 groups of screw assemblies. The three fixing holes on the outer edge of the bearing body are tightened and fixed by nuts on both sides, and the other end of the screw passes through the fixing hole of the bracket body, and the fixing hole of the bracket body is tightened and fixed by nuts on both sides.

[0010] Furthermore, the pump cover connecting assembly includes stud bolts and nuts. There are three groups of pump cover connecting assemblies. The stud bolts pass through the fixing holes of the pump cover and the outer edge of the volute respectively, and the nuts are installed at both ends of the stud bolts.

[0011] Furthermore, the volute connection assembly includes stud bolts and nuts. There are three groups of volute connection assemblies. The stud bolts pass through the fixing holes of the bracket body and the pump cover respectively. The nuts are installed at both ends of the stud bolts. The pump cover and the components on the right side of the pump cover are fixed to the bracket body through the volute connection assembly.

[0012] Compared with the prior art, the single-shell cantilever slurry pump proposed in the utility model adopts a single shell composed of a guard plate and a volute to form the flow component of the slurry pump, which solves the defects of the double-shell slurry pump, such as heavy weight, inconvenient installation, disassembly and maintenance, and large amount of production materials. The design scheme of separating the bearing body and the bracket body is adopted, which is not only convenient for disassembly and assembly of the bearing body and the bracket body, but also can adjust the axial installation position of the bearing body. The mechanical seal installation cavity composed of a mechanical seal gland and a mechanical seal box is adopted, which is convenient for the protection and maintenance of the mechanical seal. The use of two deep groove ball bearings arranged side by side can achieve the purpose of balancing the axial force. In summary, the single-shell cantilever slurry pump of the utility model is easy to manufacture, disassemble and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of a single-shell cantilever slurry pump;

[0014] Figure 2 for Figure 1 Left view of;

[0015] Figure 3 is an enlarged view of bearing component A;

[0016] Figure 4 is an enlarged view of bearing assembly B;

[0017] Figure 5 is a top view of the bracket body;

[0018] Figure 6 for Figure 5 Left view of .

[0019] The markings in the figure are: 1: pump shaft; 2: bearing assembly A; 21: bearing gland A; 22: water retaining plate A; 23: clamping nut; 24: deep groove ball bearing; 25: oil retaining ring A; 3: bearing body; 4: bracket body; 5: bearing assembly B; 51: disassembly ring; 52: water retaining plate B; 53: bearing gland B; 54: spherical roller bearing; 55: oil retaining ring B; 6: machine seal gland; 7: machine seal box; 8: pump cover; 9: auxiliary impeller; 10: guard plate; 11: volute; 12: impeller; 13: outlet short circuit; 14: screw assembly; 15: pump cover connection assembly; 16: volute connection assembly. DETAILED DESCRIPTION

[0020] In the description of the present invention, it should be noted that the terms "left", "right", "front", "back", "inside", "outside", "two ends", "one end", "the other end" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0021] In order to make the technical problems, technical solutions and implementation effects to be solved by the present utility model clearer, the following is a summary of the technical problems, technical solutions and implementation effects of the present utility model. Figure 1-6 , an embodiment of the utility model is further described:

[0022] See attached Figure 1-6The utility model is a single-shell cantilever slurry pump comprising a pump shaft 1, a bearing assembly A2, a bearing body 3, a bracket body 4, a bearing assembly B5, a machine seal gland 6, a machine seal box 7, a pump cover 8, an auxiliary impeller 9, a guard plate 10, a volute 11 and an impeller 12, wherein the bearing body 3 is fixed to the upper part of the bracket body 4 through a screw assembly 14, the bearing assembly A2 and the bearing assembly B5 are respectively installed on the left and right sides of the bearing body 3, the pump shaft 1 passes through the inner cavity of the bearing assembly A2 and the bearing assembly B5 and is installed in the bearing body 3, the pump cover 8 is fixed to the right side of the bracket body 4 through a pump cover connecting assembly 15, and the pump shaft 1 passes through the inner cavity of the pump cover 8. The mechanical seal gland 6 and the mechanical seal box 7 are fixed in the inner cavity of the pump cover 8 by screws, the mechanical seal is installed in the cavity between the mechanical seal gland 6 and the mechanical seal box 7, the guard plate 10 is installed on the right side of the pump cover 8 by studs, the left end surface of the volute 11 cooperates with the guard plate 10, and the outer edge of the volute 11 is fixed to the pump cover 8 by a volute connecting assembly 16, the impeller 12 is installed on the end of the pump shaft 1 by the thread of its hub, the auxiliary impeller 9 is fixed to the pump shaft 1 by a common flat key and is in the cavity between the mechanical seal box 7 and the guard plate 10, and the outlet short-circuit 13 is connected to the outlet flange of the volute 11 by a flange.

[0023] As a preferred embodiment, the bearing assembly A2 includes a bearing gland A21, a water retaining plate A22, a clamping nut 23, a deep groove ball bearing 24 and an oil retaining ring A25. The longitudinal section of the oil retaining ring A25 is L-shaped. The right end face of the oil retaining ring A25 contacts the shoulder of the pump shaft 1. Two deep groove ball bearings 24 are installed side by side on the left side of the oil retaining ring A25. A radial gap is set between the outer edges of the two deep groove ball bearings 24 and the bearing body 3 to ensure the normal filling of the lubricating oil and to achieve the purpose of bearing cooling. The inner boss of the bearing gland A21 is connected to the outer ring end face of the deep groove ball bearing 24. The contact is used to fix the axial position of the two deep groove ball bearings 24. The bearing gland armor 21 is fixed to the left end face of the bearing body 3 by bolts. The longitudinal section of the water retaining plate armor 22 is U-shaped to prevent foreign matter or other impurities from entering the deep groove ball bearing 24. The water retaining plate armor 22 is installed on the pump shaft 1 by interference fit, and the right end face of the water retaining plate armor 22 contacts the inner ring end face of the deep groove ball bearing 24. The clamping nut 23 is installed on the bearing by threads and contacts the left end face of the water retaining plate. The clamping nut 23 locates the axial position of the deep groove ball bearing 24 through the water retaining plate armor 22.

[0024] As a preferred embodiment, the bearing assembly B 5 includes a bearing gland B 53, a water retaining plate B 52, a disassembly ring 51, a spherical roller bearing 54 and an oil retaining ring B 55. The longitudinal section of the oil retaining ring B 55 is L-shaped. The left end face of the oil retaining ring B 55 contacts the shoulder of the pump shaft 1. The spherical roller bearing 54 is installed on the right side of the oil retaining ring B 55. A radial gap is set between the outer edge of the spherical roller bearing 54 and the bearing body 3 to ensure the normal filling of the lubricating oil and to achieve the purpose of bearing cooling. The inner boss of the bearing gland B 53 contacts the outer ring end face of the spherical roller bearing 54. , used to fix the axial position of the spherical roller bearing 54, the bearing gland B 53 is fixed to the right end face of the bearing body 3 by bolts, the longitudinal section of the water retaining plate B 52 is U-shaped to prevent foreign matter or other impurities from entering the spherical roller bearing 54, the water retaining plate B 52 is installed on the pump shaft 1 by interference fit, and the left end face of the water retaining plate B 52 contacts the inner ring end face of the spherical roller bearing 54, the disassembly ring 51 is installed on the pump shaft 1 and contacts the right end face of the water retaining plate B 52, and the disassembly ring 51 locates the axial position of the spherical roller bearing 54 through the water retaining plate B 52. .

[0025] As a preferred embodiment, the screw assembly 14 includes a screw and a nut. The screw assembly 14 has 3 groups. The three fixing holes on the outer edge of the bearing body 3 are respectively tightened and fixed by nuts on both sides. The other end of the screw passes through the fixing hole of the bracket body 4. The fixing holes of the bracket body 4 are respectively tightened and fixed by nuts on both sides. Through the screw assembly 14, not only the bearing body 3 and the bracket body 4 can be disassembled and assembled, but also the axial installation position of the bearing body 3 can be adjusted, which is convenient for the assembly of the whole machine.

[0026] As a preferred embodiment, the pump cover connecting assembly 15 includes stud bolts and nuts. The pump cover connecting assembly 15 has three groups. The stud bolts pass through the fixing holes on the outer edge of the pump cover 8 and the volute 11 respectively. The nuts are installed at both ends of the stud bolts. The left end face of the volute 11 and the right end face of the guard plate 10 are pressed together through the pump cover connecting assembly 15 to prevent the conveying medium in the volute 11 from leaking to the outside of the volute 11.

[0027] As a preferred embodiment, the volute connection assembly 16 includes stud bolts and nuts. There are three groups of volute connection assemblies 16. The stud bolts pass through the fixing holes of the bracket body 4 and the pump cover 8 respectively. The nuts are installed at both ends of the stud bolts. The pump cover 8 and the components on the right side of the pump cover 8 are fixed to the bracket body 4 through the volute connection assembly 16.

[0028] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A single-shell cantilever slurry pump, comprising a pump shaft (1), a bearing assembly A (2), a bearing body (3), a bracket body (4), a bearing assembly B (5), a machine seal gland (6), a machine seal box (7), a pump cover (8), an auxiliary impeller (9), a guard plate (10), a volute (11) and an impeller (12), characterized in that: The bearing body (3) is fixed to the upper part of the bracket body (4) through the screw assembly (14), the bearing assembly A (2) and the bearing assembly B (5) are respectively installed on the left and right sides of the bearing body (3), the pump shaft (1) passes through the inner cavity of the bearing assembly A (2) and the bearing assembly B (5) and is installed in the bearing body (3), the pump cover (8) is fixed to the right side of the bracket body (4) through the pump cover connecting assembly (15) and the pump shaft (1) passes through the inner hole of the pump cover (8), the machine seal gland (6) and the machine seal box (7) are fixed to the inner cavity of the pump cover (8) through screws, and the mechanical seal is installed on the machine seal gland (6). and a housing (7); a guard plate (10) is mounted on the right side of a pump cover (8) via studs; a left end surface of a volute (11) matches the guard plate (10); and an outer edge of the volute (11) is fixed to the pump cover (8) via a volute connection assembly (16); an impeller (12) is mounted on the end of a pump shaft (1) via a thread of a hub thereof; an auxiliary impeller (9) is fixed to the pump shaft (1) via a common flat key and is located in the cavity between the housing (7) and the guard plate (10); and an outlet short circuit (13) is connected to an outlet flange of the volute (11) via a flange.

2. A single-shell cantilever slurry pump according to claim 1, characterized in that: The bearing assembly A (2) comprises a bearing gland A (21), a water retaining plate A (22), a clamping nut (23), a deep groove ball bearing (24) and an oil retaining ring A (25). The longitudinal section of the oil retaining ring A (25) is L-shaped. The right end surface of the oil retaining ring A (25) contacts the shaft shoulder of the pump shaft (1). Two deep groove ball bearings (24) are installed side by side on the left side of the oil retaining ring A (25). A radial clearance is set between the outer edges of the two deep groove ball bearings (24) and the bearing body (3). The inner boss of the bearing cover (21) contacts the outer ring end face of the deep groove ball bearing (24), the bearing gland (21) is fixed to the left end face of the bearing body (3) by bolts, the longitudinal section of the water retaining plate (22) is U-shaped, the water retaining plate (22) is installed on the pump shaft (1) by interference fit, and the right end face of the water retaining plate (22) contacts the inner ring end face of the deep groove ball bearing (24), and the clamping nut (23) is installed on the bearing by threads and contacts the left end face of the water retaining plate.

3. A single-shell cantilever slurry pump according to claim 1, characterized in that: The bearing assembly B (5) comprises a bearing gland B (53), a water retaining plate B (52), a disassembly ring (51), a spherical roller bearing (54) and an oil retaining ring B (55). The longitudinal section of the oil retaining ring B (55) is L-shaped. The left end surface of the oil retaining ring B (55) contacts the shoulder of the pump shaft (1). The spherical roller bearing (54) is installed on the right side of the oil retaining ring B (55). A radial clearance is set between the outer edge of the spherical roller bearing (54) and the bearing body (3). The inner boss contacts the outer ring end face of the spherical roller bearing (54); the bearing gland B (53) is fixed to the right end face of the bearing body (3) by bolts; the longitudinal section of the water retaining plate B (52) is U-shaped; the water retaining plate B (52) is mounted on the pump shaft (1) by interference fit; and the left end face of the water retaining plate B (52) contacts the inner ring end face of the spherical roller bearing (54); and the disassembly ring (51) is mounted on the pump shaft (1) and contacts the right end face of the water retaining plate B (52).

4. A single-shell cantilever slurry pump according to claim 1, characterized in that: The lead screw assembly (14) comprises a lead screw and a nut. The lead screw assembly (14) has three groups. The three fixing holes on the outer edge of the bearing body (3) are respectively pressed and fixed by nuts on both sides. The other end of the lead screw passes through the fixing hole of the bracket body (4). The fixing holes on both sides of the bracket body (4) are respectively pressed and fixed by nuts.

5. The single-shell cantilever slurry pump according to claim 1, characterized in that: The pump cover connecting assembly (15) comprises stud bolts and nuts. The pump cover connecting assembly (15) has three groups. The stud bolts pass through fixing holes on the outer edges of the pump cover (8) and the volute (11) respectively, and the nuts are installed at both ends of the stud bolts.

6. The single-shell cantilever slurry pump according to claim 1, characterized in that: The volute connection assembly (16) includes stud bolts and nuts. The volute connection assembly (16) has three groups. The stud bolts pass through the fixing holes of the bracket body (4) and the pump cover (8) respectively. The nuts are installed at both ends of the stud bolts. The pump cover (8) and the components on the right side of the pump cover (8) are fixed to the bracket body (4) through the volute connection assembly (16).

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