Vertical slurry pump with large-channel spiral impeller

Abstract

The utility model provides a vertical slurry pump with a large-channel spiral impeller, which is characterized in that a motor (1) is connected with a bearing body assembly (3) through a motor bracket assembly (2), a support frame assembly (5) and a mounting plate (4) are jointly fixed on the bearing body assembly (3), and a rear protective plate (6) and a volute (7) are jointly fixed on the bearing body assembly (3); the spiral impeller (8) is installed on a pump shaft through threads arranged on a hub of the spiral impeller (8), the front protection plate (9) is fixed to the end face of a volute (7) of the pump head, the water suction cover (10) is fixed to the end face of the front protection plate (9) of the pump head, and the water outlet pipeline (11) is connected with an outlet flange of the volute (7) of the pump head through a flange at the end of the water outlet pipeline (11). The spiral impeller (8) with a special structural design is matched with the water suction cover (10) of the grid type water inlet and the adjustable gap structure between the front protective plate (9) and the spiral impeller (8), so that the problem of blockage of a flow channel of the vertical slurry pump is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to vertical slurry pump technical field, concretely relates to a vertical slurry pump of big channel helical impeller. BACKGROUND

[0002] Vertical slurry pump is a kind of centrifugal pump specially used for conveying abrasive slurry containing solid particles, mainly relies on the rotation of impeller to generate centrifugal force, slurry is inhaled into the center of impeller, and is accelerated to the outer edge of pump shell under the action of centrifugal force, and is finally conveyed to the designated position through discharge pipeline. Vertical slurry pump usually adopts single-stage single-suction centrifugal structure, and pump head part is immersed below slurry, is suitable for under-liquid working environment, and does not need to be vacuumized when starting, simplifies slurry conveying process, in addition, vertical slurry pump does not need the structure of shaft seal, ensures the reliability and high efficiency of pump when conveying abrasive slurry. But when vertical slurry pump conveys slurry containing too large solid particles or too long fibers, it is easy to cause impeller or flow passage to be blocked, wherein the impeller structure of vertical slurry pump is the key reason for inducing impeller or flow passage to be blocked. At present, the impeller of vertical slurry pump usually adopts closed impeller structure, and the closed impeller is composed of front and rear cover plates and a plurality of blades, has less internal leakage, high hydraulic model efficiency, and is suitable for conveying clean water or small-viscosity clean liquid without particles, however, with the diversification of slurry conveyed by vertical slurry pump, the characteristics of small and long flow passage of closed impeller make vertical slurry pump unable to meet the normal slurry conveying requirements, especially conveying slurry containing too large solid particles or too long fibers.

[0003] As a kind of special impeller structure, helical impeller combines helical propulsion and centrifugal action, and its impeller is usually composed of twisted three-dimensional helical blades, blade extends along the axial direction from suction port, forms helical flow passage, so that fluid can be smoothly propelled along the helical path when impeller rotates, and is widely used in technical fields such as industrial ventilation and air conditioning system, sewage treatment, food and fishery, papermaking industry and river dredging. Utility model patent "Vertical slurry pump with helical impeller" (application number: 201921906727.0) provides a device for cutting and preventing large solids from entering the suction port of the helical impeller of vertical slurry pump, which is provided with transverse cutting edges and longitudinal cutting edges, cuts and prevents large solids, avoids the blockage of helical impeller due to the suction of large solids, and the vertical slurry pump only cuts and blocks large solids through the device of the suction port of vertical slurry pump, but the technical points of how helical impeller meets the conveying of slurry containing too large solid particles or too long fibers and avoids blockage are not elaborated in detail, and the structure of helical impeller is not clear.

[0004] Therefore, in order to more effectively solve how vertical slurry pump utilizes helical impeller to realize the conveying of slurry containing large solid particles or long fibers, a big-channel helical impeller and a vertical slurry pump with the helical impeller are needed. SUMMARY

[0005] The utility model provides a kind of vertical slurry pump of large channel helical impeller, special helical impeller is replaced traditional closed impeller, adjustable gap structure between front guard plate and helical impeller is combined, cooperate with the water suction cover with net format water inlet, solve the technical problem that vertical slurry pump is easy to cause impeller blockage when conveying containing large solid particles or long fiber slurry by helical impeller.

[0006] To achieve the above object, the technical scheme of the utility model is as follows: a kind of vertical slurry pump of large channel helical impeller, including motor, motor support assembly, bearing body assembly, mounting plate, support frame assembly, pump head assembly and water outlet pipeline, the pump head assembly includes rear guard plate, volute, helical impeller, front guard plate and water suction cover, motor and bearing body assembly are connected by motor support assembly, support frame assembly and mounting plate are fixed on bearing body assembly by bolt, pump head assembly is fixed on bearing body assembly by bolt, wherein the rear guard plate of pump head and volute are fixed on bearing body assembly by spiral, the helical impeller of pump head is installed on the shaft end of pump shaft by the thread setting at the hub of helical impeller, the front guard plate of pump head is fixed on the volute end surface of pump head by screw, the water suction cover of pump head is fixed on the front guard plate end surface of pump head by screw, water outlet pipeline is connected with the volute outlet flange of pump head by the flange of water outlet pipeline end, water outlet pipeline is vertically installed and water outlet pipeline is connected with mounting plate by pipe wall fixing ring.

[0007] Further, the spiral impeller of the pump head comprises spiral blades, a hub cover plate and auxiliary blades, the front surface of the hub cover plate is a conical structure, a circular ring structure is arranged at the contact position of the conical structure of the hub cover plate and the hub cover plate, that is, the outer circle diameter of the hub cover plate is greater than the outer circle diameter of the bottom of the conical structure of the hub cover plate, the taper of the conical structure of the hub cover plate is set according to the head, flow and slurry properties of the vertical slurry pump, two spiral blades are arranged on the conical structure of the hub cover plate in a symmetrical distribution form, the spiral blades are designed as axial and radial double-twisted structures by using the theories of fluid mechanics and computational fluid dynamics and adopting CFD technology, the height of the spiral blade increases first and then decreases from the inlet of the spiral blade to the trailing edge of the spiral blade, the back surface of the hub cover plate is a plane structure, eight auxiliary blades are arranged on the back surface of the hub cover plate in a uniform distribution form, the auxiliary blades are in the form of a cuboid structure, a threaded structure is arranged in the hub inner hole of the spiral impeller, the rotation direction of the thread is opposite to the rotation direction of the vertical slurry pump, so as to avoid loosening of the spiral impeller during rotation, a rectangular tooth seal or a spiral seal structure is arranged on the outer circular surface of the hub of the spiral impeller, so as to avoid the slurry entering the support frame assembly along the gap between the hub of the spiral impeller and the inner hole of the rear baffle, in order to further improve the wear resistance of the outer circular surface of the hub of the spiral impeller, a wear-resistant layer is formed on the outer circular surface of the hub of the spiral impeller by adopting supersonic spraying, and the material of the wear-resistant layer is hard alloy or diamond.

[0008] Further, the front baffle structure of the pump head is conical as a whole, an O-shaped sealing ring structure is arranged between the front baffle and the volute of the pump head, and the gap between the front baffle and the spiral impeller of the pump head is adjusted through the screw connected between the spiral impeller and the volute of the pump head.

[0009] Further, the materials of the front baffle, the rear baffle and the volute of the pump head are cast steel, silicon carbide, silicon nitride or ceramic.

[0010] Further, the suction cover structure of the pump head is conical, the conical side wall of the suction cover is solid, a mesh-shaped water inlet is arranged at the bottom inlet of the suction cover, the diameter of the mesh-shaped water inlet is slightly smaller than the inlet diameter of the spiral impeller, the water inlet structure of the suction cover bottom makes the slurry enter the spiral impeller vertically and smoothly along the suction cover, which can reduce the turbulence and turbulence of the slurry at the inlet of the spiral impeller, improve the operation efficiency of the vertical slurry pump, and at the same time, the mesh-shaped water inlet arranged at the bottom of the suction cover can avoid the entry of too large solid particles into the spiral impeller, thereby reducing the risk of blockage of the inlet of the spiral impeller.

[0011] Further, the bearing body assembly comprises a bearing body, a cylindrical roller bearing, deep groove ball bearings and skeleton oil seals, one cylindrical roller bearing is installed at the upper end of the bearing body, two deep groove ball bearings are installed at the lower end of the bearing body in a back-to-back installation mode, the axial force generated by the operation of the helical impeller directly acts on the two deep groove ball bearings, the technical problem of the impact and damage of the axial force of the helical impeller on the motor rotor is solved, and two skeleton oil seals are installed in the bearing gland of the bearing body assembly in a back-to-back installation mode, which can not only avoid the leakage of lubricating oil of the bearing body assembly, but also prevent the slurry in the support frame assembly from entering the bearing body assembly, thereby prolonging the service life of the bearing body assembly.

[0012] Further, the motor support assembly comprises a motor support shell and a shaft coupling, and the shaft coupling is an elastic pin shaft coupling or an elastic sleeve pin shaft coupling.

[0013] Compared with the prior art, the vertical slurry pump with a large-channel helical impeller has the advantages that: the special helical impeller is adopted to replace the traditional closed impeller, the special flow channel design and structural design of the helical impeller are adopted, the helical impeller structure with a large channel and capable of effectively avoiding flow channel blockage is formed, the water suction cover with a mesh-shaped water inlet is matched, the possibility of solid particles with a particle size greater than the inlet diameter of the helical impeller entering the helical impeller is further reduced, meanwhile, the vertical slurry pump is provided with an adjusting structure of the gap between the front guard plate and the helical impeller, the operation condition of the vertical slurry pump is widened, and finally, the special bearing body assembly structural design can not only effectively solve the problem of the axial force generated during the operation of the vertical slurry pump, but also avoid the leakage of lubricating oil of the bearing body assembly and the entry of the slurry. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a whole structure schematic view of the utility model;

[0015] Figure 2 It is a front view of the helical impeller of the utility model;

[0016] Figure 3 It is a back view of the helical impeller of the utility model.

[0017] In the drawing, 1 is an electric motor, 2 is a motor support assembly, 3 is a bearing body assembly, 31 is a cylindrical roller bearing, 32 is a deep groove ball bearing, 33 is a skeleton oil seal, 4 is an installation plate, 5 is a support frame assembly, 6 is a rear guard plate, 7 is a volute, 8 is a helical impeller, 81 is a helical blade, 82 is a hub cover plate, 83 is a sub-blade, 9 is a front guard plate, 10 is a water suction cover, and 11 is a water outlet pipeline. DETAILED DESCRIPTION

[0018] In the description of the utility model, it is necessary to explain that the terms "left", "right", "front", "back", "inner", "outer", "two ends", "one end", "the other end" and the like indicate the position or location relationship based on the position or location relationship shown in the drawing, and are only for the convenience of describing the utility model, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0019] In order to make the technical problems, technical schemes and implementation effects to be solved by the utility model clearer, the following will be further described in combination with the drawings of the utility model. Figures 1-3 One embodiment of the utility model is further described as follows:

[0020] Referring to the drawings of the utility model, Figures 1-3 The vertical slurry pump with large channel spiral impeller comprises a motor 1, a motor support assembly 2, a bearing body assembly 3, a mounting plate 4, a support frame assembly 5, a pump head assembly and a water outlet pipeline 11, the pump head assembly comprises a rear guard plate 6, a volute 7, a spiral impeller 8, a front guard plate 9 and a water suction cover 10, the motor 1 is connected with the bearing body assembly 3 through the motor support assembly 2, the support frame assembly 5 and the mounting plate 4 are fixed on the bearing body assembly 3 through bolts, the pump head assembly is fixed on the bearing body assembly 3 through bolts, wherein the rear guard plate 6 of the pump head and the volute 7 are fixed on the bearing body assembly 3 through a spiral, the spiral impeller 8 of the pump head is installed on the shaft end of the pump shaft through the threads arranged at the hub of the spiral impeller 8, the front guard plate 9 of the pump head is fixed on the end face of the volute 7 of the pump head through screws, the water suction cover 10 of the pump head is fixed on the end face of the front guard plate 9 of the pump head through screws, the water outlet pipeline 11 is connected with the outlet flange of the volute 7 of the pump head through the flange at the end of the water outlet pipeline 11, and the water outlet pipeline 11 is vertically installed and connected with the mounting plate 4 through the pipe wall fixing ring.

[0021] As a preferred embodiment, referring to the drawings of the utility model, Figure 2 and 3As shown, the spiral impeller 8 of the pump head comprises spiral blades 81, a hub cover plate 82 and auxiliary blades 83. The front surface of the hub cover plate 82 is in a conical structure. A circular ring structure is arranged at the contact position of the conical structure of the hub cover plate 82 and the hub cover plate 82. That is, the outer diameter of the hub cover plate 82 is greater than the outer diameter of the bottom of the conical structure of the hub cover plate 82. The taper of the conical structure of the hub cover plate 82 is set according to the head, flow and slurry properties of the vertical slurry pump. Two spiral blades 81 are arranged on the conical structure of the hub cover plate 82 in a symmetrical distribution. The spiral blades 81 are designed as an axial and radial double-twisted structure by using the theories of fluid mechanics and computational fluid dynamics and adopting the CFD technology. The height of the spiral blade 81 increases first and then decreases from the inlet to the tail edge of the spiral blade 81. The back surface of the hub cover plate 82 is in a plane structure. Eight auxiliary blades 83 are arranged on the back surface of the hub cover plate 82 in a uniform distribution. The auxiliary blades 83 are in a cuboid structure. The hub inner hole of the spiral impeller 8 is provided with a threaded structure. The rotation direction of the thread is opposite to the rotation direction of the vertical slurry pump, so as to avoid loosening of the spiral impeller 8 during rotation. The outer circular surface of the hub of the spiral impeller 8 is provided with a rectangular tooth seal or a spiral seal structure, so as to avoid the slurry entering the support frame assembly 5 along the gap between the hub of the spiral impeller 8 and the inner hole of the rear baffle 6. In order to further improve the wear resistance of the outer circular surface of the hub of the spiral impeller 8, the outer circular surface of the hub of the spiral impeller 8 is cladded with a wear-resistant layer by using the ultrasonic spraying mode. The material of the wear-resistant layer is hard alloy or diamond.

[0022] As a preferred embodiment, refer to the accompanying drawings Figure 2 and 3 As shown, when the spiral impeller 8 conveys the slurry, after the slurry enters the flow channel of the spiral blade 81, the flow channel of the spiral impeller 8 gradually increases, and at the same time, under the rotation of the spiral impeller 8, the kinetic energy and pressure energy of the slurry gradually increase, which greatly improves the pumping capacity of the spiral impeller 8. In addition, as the flow channel of the spiral impeller 8 gradually increases, the flow capacity of the spiral impeller 8 can be maximized, and the phenomenon of blockage of the flow channel of the spiral impeller 8 can be avoided.

[0023] As a preferred embodiment, refer to the accompanying drawings Figure 2 and 3 As shown, the circular ring structure is arranged at the contact position of the conical structure of the hub cover plate 82 and the hub cover plate 82, which can make the slurry in the spiral impeller 8 smoothly enter the volute 7 of the pump head after being thrown along the flow channel, and reduce the erosion and wear of the volute 7 caused by the high-speed slurry in the spiral impeller 8.

[0024] As a preferred embodiment, refer to the accompanying drawings Figure 1As shown, the front shield 9 of the pump head is conical in structure, and an O-ring is arranged between the front shield 9 and the volute 7 of the pump head. The gap between the front shield 9 and the screw impeller 8 of the pump head is adjusted by a screw connecting the screw impeller 8 and the volute 7 of the pump head.

[0025] As a preferred embodiment, refer to the attached Figure 1 As shown, the front shield 9, the rear shield 6 and the volute 7 of the pump head are made of cast steel, silicon carbide, silicon nitride or ceramic.

[0026] As a preferred embodiment, refer to the attached Figure 1 As shown, the water suction cover 10 of the pump head is conical in structure, and the side wall of the water suction cover 10 is solid. A mesh-shaped water inlet is arranged at the bottom of the water suction cover 10, and the diameter of the mesh-shaped water inlet is slightly smaller than the diameter of the inlet of the screw impeller 8. The water suction cover 10 with the mesh-shaped water inlet at the bottom can make the slurry enter the screw impeller 8 vertically and smoothly, reduce the turbulence and turbulence of the slurry at the inlet of the screw impeller 8, and improve the operating efficiency of the vertical slurry pump. At the same time, the mesh-shaped water inlet at the bottom of the water suction cover 10 can prevent large solid particles from entering the screw impeller 8 and reduce the risk of blockage at the inlet of the screw impeller 8.

[0027] As a preferred embodiment, refer to the attached Figure 1 As shown, the bearing body assembly 3 includes a bearing body, a cylindrical roller bearing 31, two deep groove ball bearings 32 and two skeleton oil seals 33. One cylindrical roller bearing is installed at the upper end of the bearing body, and two deep groove ball bearings 32 are installed at the lower end of the bearing body in a back-to-back installation form. The axial force generated by the operation of the screw impeller 8 directly acts on the two deep groove ball bearings 32, solving the technical problem of the impact and damage of the axial force of the screw impeller 8 on the rotor of the motor 1. The two skeleton oil seals 33 are installed in the bearing gland of the bearing body assembly 3 in a back-to-back installation form, which not only prevents the leakage of lubricating oil of the bearing body assembly 3, but also prevents the slurry in the support frame assembly 5 from entering the bearing body assembly 3, prolonging the service life of the bearing body assembly 3.

[0028] As a preferred embodiment, refer to the attached Figure 1 As shown, the motor support assembly 2 includes a motor support shell and a coupling. The coupling is a elastic pin coupling or a elastic sleeve pin coupling.

[0029] As a preferred embodiment, the vertical slurry pump with the large-channel spiral impeller provided by the utility model can avoid that solid particles with a particle size greater than the inlet diameter of the spiral impeller 8 enter the spiral impeller 8, and the slurry enters the inlet of the spiral impeller 8 from the suction cover 10, which maximally reduces the turbulent flow and turbulent flow phenomenon of the slurry in the suction cover 10, so that the slurry can smoothly enter the spiral impeller 8; under the driving action of the rotation of the spiral impeller 8, the slurry enters the volute 7 of the pump head along the large flow channel of the spiral impeller 8, and the kinetic energy and pressure energy of the slurry gradually increase in the process; the circular ring structure arranged on the hub cover plate 82 of the spiral impeller 8 can effectively reduce the erosion and wear of the volute 7 of the pump head by the slurry, and prolong the service life of the flow part of the vertical slurry pump; in addition, the gap between the spiral impeller 8 and the front guard plate 9 can be adjusted through screws, which widens the operation condition of the vertical slurry pump; secondly, according to the properties of the slurry and the operation condition of the vertical slurry pump, the taper of the spiral impeller 8 and the taper of the front guard plate 9 are reasonably designed to meet the pumping requirements of the slurry; finally, the vertical slurry pump can select the vertical slurry pump with the suction cover 10 or the vertical slurry pump without the suction cover 10 according to the operation condition, which further expands the application range of the vertical slurry pump.

[0030] The above merely describes the preferred embodiments of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A large channel spiral impeller vertical slurry pump, comprising a motor (1), a motor support assembly (2), a bearing body assembly (3), a mounting plate (4), a support frame assembly (5), a pump head assembly and a water outlet pipeline (11), the pump head assembly comprising a rear baffle (6), a volute (7), a spiral impeller (8), a front baffle (9) and a water suction cover (10), the motor (1) being connected with the bearing body assembly (3) through the motor support assembly (2), the support frame assembly (5) and the mounting plate (4) being fixed on the bearing body assembly (3) by bolts, the pump head assembly being fixed on the bearing body assembly (3) by bolts, characterized in that: The rear guard plate (6) of the pump head and the volute (7) are fixed on the bearing body assembly (3) by a screw, the screw impeller (8) of the pump head is installed on the shaft end of the pump shaft through the thread arranged at the hub of the screw impeller (8), the front guard plate (9) of the pump head is fixed on the end face of the volute (7) of the pump head by a screw, the water suction cover (10) of the pump head is fixed on the end face of the front guard plate (9) of the pump head by a screw, the water outlet pipeline (11) is connected with the outlet flange of the volute (7) of the pump head through the flange at the end of the water outlet pipeline (11), and the water outlet pipeline (11) is vertically installed and connected with the mounting plate (4) through the pipeline wall fixing ring. ​ 2. A vertical slurry pump of the large channel spiral impeller type according to claim 1, characterized in that: The screw impeller (8) of the pump head comprises a spiral blade (81), a hub cover plate (82) and a secondary blade (83), the front surface of the hub cover plate (82) is a conical structure, a circular ring structure is arranged at the contact position of the conical structure of the hub cover plate (82) and the hub cover plate (82), the taper of the conical structure of the hub cover plate (82) is set according to the head, flow and slurry properties of the vertical slurry pump, two spiral blades (81) are arranged on the conical structure of the hub cover plate (82) in a symmetrical distribution form, the spiral blade (81) is a double-twisted structure in the axial and radial directions, the height of the spiral blade (81) is in a structure form that first increases and then decreases from the inlet of the spiral blade (81) to the trailing edge of the spiral blade (81), the back surface of the hub cover plate (82) is a plane structure, eight secondary blades (83) are arranged on the back surface of the hub cover plate (82) in a uniform distribution form, the secondary blade (83) is a cuboid structure, the hub inner hole of the screw impeller (8) is provided with a thread structure, the rotation direction of the thread is opposite to the rotation direction of the vertical slurry pump, a rectangular tooth seal or a spiral seal structure is arranged on the outer circular surface of the hub of the screw impeller (8), and a wear-resistant layer of hard alloy or diamond is cladded on the outer circular surface of the hub of the screw impeller (8).

3. A vertical slurry pump of the large channel spiral impeller type according to claim 1, characterized in that: The front guard plate (9) of the pump head is conical as a whole, an O-shaped sealing ring structure is arranged between the front guard plate (9) and the volute (7) of the pump head, and the gap between the front guard plate (9) and the screw impeller (8) of the pump head is adjusted through the screw connected between the screw impeller (8) and the volute (7) of the pump head.

4. A vertical slurry pump of the large channel spiral impeller type according to claim 1, characterized in that: The front guard plate (9), the rear guard plate (6) and the volute (7) of the pump head are made of cast steel, silicon carbide, silicon nitride or ceramic.

5. A vertical slurry pump of the large channel spiral impeller type according to claim 1, characterized in that: The water suction cover (10) of the pump head is conical, the conical side wall of the water suction cover (10) is solid, a mesh-shaped water inlet is arranged at the bottom inlet of the water suction cover (10), and the diameter of the mesh-shaped water inlet is slightly smaller than the inlet diameter of the screw impeller (8).

6. A vertical slurry pump of the large channel spiral impeller type according to claim 1, characterized in that: The bearing body assembly (3) comprises a bearing body, a cylindrical roller bearing (31), a deep groove ball bearing (32) and a skeleton oil seal (33), one cylindrical roller bearing is installed at the upper end of the bearing body, two deep groove ball bearings (32) are installed at the lower end of the bearing body in a back-to-back installation form, and two skeleton oil seals (33) are installed in the bearing pressure cover of the bearing body assembly (3) in a back-to-back installation form.

7. A vertical slurry pump of the large channel spiral impeller type according to claim 1, characterized in that: The motor support assembly (2) comprises a motor support shell and a shaft coupling, and the shaft coupling is an elastic pin coupling or an elastic sleeve pin coupling.

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