Large-flow abrasion-resistant sectional volute multistage pump

Abstract

The invention relates to a large-flow abrasion-resistant sectional volute multi-stage pump. The multi-stage pump comprises a driving end bearing component, a rotor component, a sealing component, a first auxiliary impeller, a suction section, a volute body, a sealing ring, a connecting component, an impeller, a discharge section, a final-stage impeller, a balance drum, a second auxiliary impeller, a balance pipe, a pump shaft and a free end bearing component. The original radial guide vane and the annular middle section are combined, so that the water pump is more compact in structure and convenient and reliable to machine and cast. And the inner side of the impeller cover plate is designed to be gradually expanded, so that the scouring of particles in a medium to a pump body runner and the impeller cover plate is effectively reduced. Due to the design of the sealing ring of the pump body and the multi-line reverse thread groove of the impeller, the throttling effect is effectively improved, and the operation efficiency of the pump is improved. The front portions of the sealing cavities at the two ends are each provided with a set of auxiliary impeller device, non-contact sealing is provided for the pump, and silt or other solid particles are effectively prevented from entering the sealing device of the pump.

Description

Technical Field

[0001] The present invention relates to a segmented volute multi-stage pump, and more particularly to a large-flow wear-resistant segmented volute multi-stage pump with a compact structure, convenient and reliable processing and casting, good erosion and abrasion resistance, low manufacturing cost, and long service life of each component of the pump unit. Background Art

[0002] The large-flow wear-resistant segmented volute multi-stage pump is a fluid conveying device widely used in the industrial field. Its working principle mainly relies on the series connection of multiple impellers to achieve the pressurized conveying of fluids. This design not only improves the head capacity of the pump but also makes the flow control more stable and reliable. Structurally, a multi-stage pump usually consists of components such as a stator, a rotor, a balance mechanism, and bearings. The rotor is the core part, composed of a shaft and multiple impellers, while the stator includes an inlet and outlet section and a middle water guide housing.

[0003] When a multi-stage pump is operating, if a large amount of sediment or other solid particles are contained in its process medium, the hard sediment or solid particles will cause serious wear and damage to the surfaces of the flow-through components, water guide bearings, and sealing components. Serious wear of the pump components will result in serious consequences. At the lightest, it will require frequent repair and maintenance, and replacement of the pump unit. At the heaviest, it will cause serious operating incidents such as jamming and huge economic losses. Summary of the Invention

[0004] Aiming at the above problems, the main object of the present invention is to provide a large-flow wear-resistant segmented volute multi-stage pump with a compact structure, convenient and reliable processing and casting, good erosion and abrasion resistance, low manufacturing cost, and long service life of each component of the pump unit.

[0005] The present invention solves the above technical problems through the following technical solutions: A large-flow wear-resistant segmented volute multi-stage pump, the large-flow wear-resistant segmented volute multi-stage pump includes: a drive-end bearing component, a rotor component, a sealing component, a first auxiliary impeller, a suction section, a volute casing, a sealing ring, a connecting component, an impeller, a discharge section, a last-stage impeller, a balance drum, a second auxiliary impeller, a balance pipe, a pump shaft, and a free-end bearing component.

[0006] The drive-end bearing component and the free-end bearing component are respectively located at the drive end and the free end of the multi-stage pump. The suction section and the discharge section are respectively located at the inlet and outlet of the multi-stage pump. Between the suction section and the discharge section are several impellers and a last-stage impeller. A first auxiliary impeller is designed at the front of the sealing component cavity at the drive end, and a second auxiliary impeller is designed at the front of the sealing component cavity at the free end.

[0007] The rotor component includes a first auxiliary impeller, several impellers, a final-stage impeller, a balance drum, a pump shaft, a drive-end bearing component, a second auxiliary impeller, and a free-end bearing component; the pump shaft is connected to the motor; the first auxiliary impeller, several impellers, the final-stage impeller, and the balance drum and the second auxiliary impeller are all fixed on the pump shaft.

[0008] The volute casing is a symmetric volute. The volute casing is a combined body of a radial guide vane and an annular middle section. The connecting component is installed between the suction section and the discharge section, and both ends are fixedly distributed on the suction section and the discharge section.

[0009] The balance drum is located between the final-stage impeller and the second auxiliary impeller; a balance cavity is provided between the discharge section and the free end. The balance cavity is connected to the suction section through a balance pipe. The balance drum and the balance cavity together form an axial force balance device for the pump set.

[0010] In a specific embodiment of the present invention, the suction section and the discharge section each reserve mounting holes for the connecting component. Both ends of the connecting component have threads and are fixed at both ends with nuts.

[0011] In a specific embodiment of the present invention, the number of volute casings is four, and they are designed to be symmetrically circumferentially distributed.

[0012] In a specific embodiment of the present invention, the volute end face of the volute casing adopts a spiral protrusion structure.

[0013] In a specific embodiment of the present invention, the inner sides of the covers of the impellers and the final-stage impeller both adopt a gradually expanding design.

[0014] In a specific embodiment of the present invention, the mating circumferential surfaces of the sealing ring and the impeller are both designed with multi-start thread grooves, and the helix directions of the multi-start thread grooves of the two are opposite.

[0015] In a specific embodiment of the present invention, rectangular grooves are designed at the inlet ends of the impellers, and the spiral direction thereof is opposite to the rotation direction of the impellers and the final-stage impeller.

[0016] In a specific embodiment of the present invention, a reflux hole is designed in the drive-side suction section.

[0017] In a specific embodiment of the present invention, the discharge section is a discharge section adopting a volute-type hydraulic design.

[0018] In a specific embodiment of the present invention, spiral secondary vanes are designed on the rear cover of the final-stage impeller.

[0019] The positive and progressive effects of the present invention are as follows: The large-flow wear-resistant and corrosion-resistant sectional volute multistage pump provided by the present invention has the following advantages compared with common technologies: The present invention adopts an efficient and compact symmetric volute design, combining the original radial guide vane and annular middle section, making the pump structure more compact, the machining and casting convenient and reliable, the erosion and abrasion resistance effect good, and the pump operation efficiency significantly improved.

[0020] The inner side of the impeller cover plate of the present invention adopts an expanding design, and the end face of the pump volute adopts a spiral and convex structure. When used in cooperation with the impeller, it effectively reduces the erosion of the internal particles of the medium on the pump flow passage and the impeller cover plate.

[0021] The sealing ring and the impeller inlet sealing ring part of the present invention adopt a multi-thread reverse thread groove design. While ensuring the running clearance, it effectively improves the throttling effect and the pump operation efficiency.

[0022] The inlet end of the impeller of the present invention is designed with rectangular grooves, which solves the accumulation of solid particles and impurities at the impeller inlet, prevents solid particles and impurities from entering the dynamic and static clearances of the sealing ring, reduces the erosion of impurities on the sealing ring and the impeller, and improves the operation reliability.

[0023] A sub-impeller is designed in front of the sealing cavity of the present invention. While providing a non-contact seal for the pump, the sub-impeller effectively prevents sediment or other solid particles from entering the pump sealing device, prevents the wear and damage of the sealing components by sediment or other solid particles, improves the operation life and operation reliability of the sealing components, and thus improves the economy of users.

[0024] A return hole is designed at the suction end of the present invention. Under the action of the centrifugal force of the sub-impeller, solid particles and impurities enter the suction port through the return hole, thus effectively solving the accumulation of solid particles and impurities in the sealing cavity and the suction port, inhibiting the erosion of solid particles and impurities on the sealing components and the flow-through components, and improving the wear and corrosion resistance effect of the pump unit.

[0025] The discharge section of the present invention adopts a volute hydraulic design, and the radial guide vane is cancelled. While reducing the components of the pump unit, it improves the wear and corrosion resistance and erosion resistance performance of the pump unit, significantly improves the pump operation efficiency, and is more compact in structure compared with the radial guide vane structure, and is more convenient and reliable for machining and casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0027] Figure 2-1 It is a schematic diagram of the structure of the sub-impeller in the present invention.

[0028] Figure 2-2 It is Figure 2-1 the A-A view of

[0029] Figure 2-3 It is Figure 2-1 the B-B view of

[0030] Figure 3-1 It is a schematic diagram of the structure of the impeller in the present invention.

[0031] Figure 3-2 It is Figure 3-1Left view.

[0032] Figure 3-3 is Figure 3-1 right view.

[0033] Figure 4 Structural schematic diagram of the volute casing in the present invention.

[0034] The following are the names corresponding to the reference numerals in the present invention:

[0035] Drive end bearing component 1, rotor component 2, sealing component 3, first auxiliary impeller 4, suction section 5, volute casing 6, sealing ring 7, connecting component 8, impeller 9, discharge section 10, last-stage impeller 11, balance drum 12, second auxiliary impeller 13, balance pipe 14, pump shaft 15, free end bearing component 16, return hole 17, spiral protrusion structure 601, multi-threaded groove 901, rectangular groove 902, spiral auxiliary blade 1101. Detailed implementation mode

[0036] The following provides a preferred embodiment of the present invention in conjunction with the accompanying drawings to elaborate in detail on the technical solution of the present invention.

[0037] Figure 1 is the overall structural schematic diagram of the present invention. As Figure 1 shown, the present invention proposes a large-flow abrasion-resistant sectional volute multistage pump, which includes: drive end bearing component 1, rotor component 2, sealing component 3, first auxiliary impeller 4, suction section 5, volute casing 6, sealing ring 7, connecting component 8, impeller 9, discharge section 10, last-stage impeller 11, balance drum 12, second auxiliary impeller 13, balance pipe 14, pump shaft 15, free end bearing component 16.

[0038] The drive end bearing component 1 and the free end bearing component 16 are respectively located at the drive end and the free end of the multistage pump. The suction section 5 and the discharge section 10 are respectively located at the inlet and the outlet of the multistage pump. Between the suction section 5 and the discharge section 10 are several impellers 9 and the last-stage impeller 11. In the front part of the cavity of the sealing component 3 at the drive end, a first auxiliary impeller 4 is designed, and in the front part of the cavity of the sealing component 3 at the free end, a second auxiliary impeller 13 is designed (the first auxiliary impeller 4 and the second auxiliary impeller 13 have the same structure, see Figure 2-1 , 2-2 , 2-3).

[0039] The rotor component 2 includes the first auxiliary impeller 4, several impellers 9, the last-stage impeller 11, the balance drum 12, the pump shaft 15, the drive end bearing component 1, the second auxiliary impeller 13, and the free end bearing component 16; the pump shaft 15 is connected to the motor; the first auxiliary impeller 4, several impellers 9, the last-stage impeller 11, and the second auxiliary impeller 13 are all fixed on the pump shaft 15.

[0040] The volute casing 6 is a symmetric volute. The volute casing 6 is a combined body of a radial guide vane and an annular middle section. The connecting component 8 is installed between the suction section and the discharge section, and is fixedly distributed at both ends on the suction section and the discharge section. For a segmented pump, each stage needs to be tightly pressed on the outermost side, and the connecting component is for pressing the whole. In the specific implementation process, the suction section and the discharge section respectively reserve installation holes for the connecting component 8. Both ends of the connecting component have threads, and nuts are used to fix both ends.

[0041] The balance drum 12 is located between the last-stage impeller 11 and the second auxiliary impeller 13. A balance cavity is provided between the discharge section 10 and the free end. The balance cavity is communicated with the suction section 5 through a balance pipe 14. The balance drum 12 and the balance cavity together form an axial force balance device for the pump unit.

[0042] In the specific implementation process, the number of volute casings 6 is four, and they are symmetrically designed in a circumferential uniform distribution. The volute casing 6 combines the original radial guide vane and the annular middle section. While taking into account the flow channel, it is also a pressure-bearing component of the pump unit. The design of the volute casing 6 reduces the axial dimension of the water pump, makes the structure of the water pump more compact, and is more convenient and reliable for machining and casting compared with the radial guide vane. Moreover, its flow channel shape is more in line with the liquid flow characteristics, making the volute casing 6 more excellent in terms of erosion resistance, and the operation efficiency of the water pump is more efficient and reliable.

[0043] Figure 3-1 It is a structural schematic diagram of the impeller in the present invention. Figure 3-2 is Figure 3-1 the left view of Figure 3-3 is Figure 3-1 the right view of . As shown in the above figures: In the specific implementation process, the inner sides of the covers of the impeller 9 and the last-stage impeller 11 adopt an expanding design. Refer to Figure 3-1 at A in Figure 4 . The solid particles and impurities are pressurized by the impeller 9 and the last-stage impeller 11 and then move to the expanding outlets of the impeller 9 and the last-stage impeller 11, and then enter the volute. After that, they are discharged under the centrifugal action of the spiral convex end face of the volute casing 6, effectively solving the problem of the retention and erosion of solid particles and impurities in the volute casing 6. The volute casing 6 is designed in cooperation with the impeller 9 and the last-stage impeller 11, effectively reducing the erosion of the internal particles of the medium on the flow channel of the pump body and the impeller cover.

[0044] In the specific implementation process, multi-start thread grooves 901 are designed on the mating circumferential surfaces of the sealing ring 7 and the impeller 9. The helix directions of the multi-start thread grooves of the two are opposite. In the operating state, the two multi-start threads interact to generate a reverse spiral sealing effect, preventing the leaked fluid in the volute casing 6 from flowing back to the inlet part of the impeller 9. And due to the propulsion effect of the reverse multi-start threads, solid particles and impurities are effectively prevented from entering between the sealing ring 7 and the impeller 9. While ensuring the operating clearance, the throttling effect is effectively improved, and the pump operating efficiency and safe operation performance are enhanced.

[0045] In the specific implementation process, rectangular grooves 902 are designed at the inlet ends of the impellers 9. The helix direction thereof is opposite to the rotation directions of the impellers 9 and the last-stage impeller 11. When the pump unit is operating, the solid particles and impurities at the impeller inlets enter the inlets of the impellers 9 under the action of centrifugal force, effectively solving the accumulation of solid particles and impurities at the inlets of the double-suction impellers 9, preventing the solid particles and impurities from entering between the sealing ring 7 and the impeller 9, reducing the erosion of the sealing ring 7 and the impeller 9 by the impurities, and improving the operating reliability.

[0046] In the specific implementation process, a first auxiliary impeller 4 is designed at the front part of the cavity of the drive-end and free-end sealing components 3. While providing a non-contact seal for the pump, the first auxiliary impeller 4 also effectively prevents sediment or other solid particles from entering the sealing components of the pump, effectively protecting the sealing device, extending the service life of the sealing components, increasing the safe operation period of the pump unit, and thus generating higher economic benefits.

[0047] In the specific implementation process, a return hole 17 is designed in the drive-side suction section 5. Under the action of the centrifugal force of the first auxiliary impeller 4, the solid particles and impurities enter the suction port through the return port. A balance cavity is designed in the discharge section 10. The balance drum 12 and the balance cavity together form an axial force balance device for the pump unit. Compared with the existing balance disk design, it is simple to machine and reliable in operation. The balance cavity is connected to the suction section 5 through a balance pipe 14. While balancing the axial force, it also enables the solid particles and impurities to flow back into the suction port under the action of the centrifugal force of the second auxiliary impeller 13, thus effectively solving the accumulation of solid particles and impurities in the sealing cavity and the suction port, improving the erosion resistance effect of the pump unit, and enhancing the operating reliability of the pump unit.

[0048] In the specific implementation process, the discharge section 10 adopts a volute hydraulic design, and the radial guide vanes are eliminated. The volute hydraulic design is more in line with the liquid flow state, so that the wear resistance and scouring effect of the volute body are better, and the operation efficiency of the water pump is significantly improved. The structure is more compact than the radial guide vanes, and the processing and casting are more convenient and reliable. In addition, the rear cover plate of the last-stage impeller 11 is designed with a spiral auxiliary blade 1101, which effectively inhibits solid particles and impurities from entering the gap between the balance drum 12 and the balance cavity due to the centrifugal effect of the auxiliary blades while balancing part of the axial force, thereby improving the scouring resistance of the balancing device and improving the operating reliability of the pump group.

[0049] The present invention adopts a highly efficient and compact symmetrical volute design, and combines the original radial guide vanes and the annular middle section, so that the water pump structure is more compact, the processing and casting are convenient and reliable, the erosion and abrasion resistance effect is good, and the water pump operation efficiency is significantly improved.

[0050] The inner side of the impeller cover plate of the present invention adopts a gradually expanding design, and the end face of the pump volute adopts a spiral and convex structure, which is used in conjunction with the impeller to effectively reduce the scouring of the pump body flow channel and the impeller cover plate by particles inside the medium.

[0051] The sealing ring and the impeller inlet sealing ring of the present invention adopt a multi-line reverse thread groove design, which effectively improves the throttling effect and improves the pump operation efficiency while ensuring the operating clearance.

[0052] The rectangular groove is designed at the inlet end of the impeller of the present invention to solve the problem of accumulation of solid particles and impurities at the impeller inlet, prevent solid particles and impurities from entering the dynamic and static gap of the sealing ring, and improve the operating reliability while reducing the scouring of the sealing ring and the impeller by impurities.

[0053] The auxiliary impeller is designed in front of the sealing chamber of the present invention. The auxiliary impeller provides a non-contact seal for the pump and effectively prevents mud or other solid particles from entering the sealing device of the pump, thereby preventing mud or other solid particles from wearing and damaging the sealing components, thereby increasing the service life and operating reliability of the sealing components and thus improving the economic benefits for users.

[0054] The suction end of the present invention is designed with a reflow hole. Under the centrifugal force of the auxiliary impeller, solid particles and impurities enter the suction port through the reflow hole, thereby effectively solving the accumulation of solid particles and impurities in the sealing cavity and the suction port, inhibiting the scouring of the sealing components and flow-through components by solid particles and impurities, and improving the wear resistance of the pump group.

[0055] The discharge section of the present invention adopts a volute type hydraulic design and eliminates radial guide vanes. While reducing the number of pump components, the wear resistance and scouring performance of the pump are improved, so that the operating efficiency of the water pump is significantly improved. Compared with the radial guide vane structure, it is more compact and the processing and casting are more convenient and reliable.

[0056] The above 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 by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A high-flow, wear-resistant segmented volute multistage pump, characterized in that: The large flow rate, wear-resistant segmented volute multistage pump comprises: Drive end bearing components, rotor components, sealing components, first auxiliary impeller, suction section, volute casing, sealing ring, connecting components, impeller, discharge section, final stage impeller, balance drum, second auxiliary impeller, balance pipe, pump shaft, free end bearing components; The driving end bearing component and the free end bearing component are respectively located at the driving end and the free end of the multistage pump, the suction section and the discharge section are respectively located at the inlet and the outlet of the multistage pump, and a plurality of impellers and a final stage impeller are arranged between the suction section and the discharge section; the front part of the sealing component cavity at the driving end is designed with a first auxiliary impeller, and the front part of the sealing component cavity at the free end is designed with a second auxiliary impeller; The rotor components include the first auxiliary impeller, several impellers, the final impeller, a balance drum, a pump shaft, a drive end bearing component, a second auxiliary impeller, and a free end bearing component; the pump shaft is connected to the motor; the first auxiliary impeller, several impellers, the final impeller, the balance drum and the second auxiliary impeller are all fixed on the pump shaft; The volute casing is a symmetrical volute, which is a combination of radial guide vanes and an annular middle section. The connecting component is installed between the suction section and the discharge section, and the two ends are distributed and fixed on the suction section and the discharge section. The balance drum is located between the last-stage impeller and the second auxiliary impeller; a balance cavity is provided between the discharge section and the free end, the balance cavity is connected to the suction section through a balance pipe, and the balance drum and the balance cavity together constitute an axial force balancing device of the pump group.

2. The high-flow, wear-resistant segmented volute multistage pump according to claim 1 is characterized in that: The suction section and the discharge section each have reserved mounting holes for the connecting parts. Both ends of the connecting parts are threaded and fixed with nuts.

3. The high-flow, wear-resistant segmented volute multistage pump according to claim 1 is characterized in that: There are four volute casings, which are evenly distributed around the circumference and designed to be symmetrical.

4. The high-flow, wear-resistant segmented volute multistage pump according to claim 1 is characterized in that: The end face of the volute casing adopts a spiral convex structure.

5. The high-flow, wear-resistant segmented volute multistage pump according to claim 1 is characterized in that: The inner sides of the impeller and the cover plates of the final stage impeller are designed with a gradually expanding shape.

6. The high-flow, wear-resistant segmented volute multistage pump according to claim 1 is characterized in that: The sealing ring and the impeller matching circumferential surface are both designed with multi-line thread grooves, and the multi-line thread grooves of the two have opposite rotation directions.

7. The high-flow, wear-resistant segmented volute multistage pump according to claim 1 is characterized in that: The inlet end of the impeller is designed with a rectangular groove, and its spiral direction is opposite to the rotation direction of the impeller and the last-stage impeller.

8. The high-flow, wear-resistant segmented volute multistage pump according to claim 1 is characterized in that: The drive side suction section is designed with a return hole.

9. The high-flow, wear-resistant segmented volute multistage pump according to claim 1, characterized in that: The discharge section adopts a volute type hydraulic design.

10. The high flow rate, wear-resistant segmented volute multistage pump according to claim 1, characterized in that: The rear cover of the last stage impeller is designed with spiral auxiliary blades.

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