CN114876809A - Two-stage vertical side suction pump - Google Patents
Two-stage vertical side suction pump Download PDFInfo
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- CN114876809A CN114876809A CN202210401087.8A CN202210401087A CN114876809A CN 114876809 A CN114876809 A CN 114876809A CN 202210401087 A CN202210401087 A CN 202210401087A CN 114876809 A CN114876809 A CN 114876809A
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- 230000008878 coupling Effects 0.000 claims description 9
- 238000010168 coupling process Methods 0.000 claims description 9
- 238000005859 coupling reaction Methods 0.000 claims description 9
- 230000007246 mechanism Effects 0.000 claims description 6
- 230000002265 prevention Effects 0.000 claims description 6
- 230000003068 static effect Effects 0.000 claims description 6
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- 238000003825 pressing Methods 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 5
- 238000005299 abrasion Methods 0.000 abstract 1
- 238000002788 crimping Methods 0.000 abstract 1
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- 230000006872 improvement Effects 0.000 description 3
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- 230000009286 beneficial effect Effects 0.000 description 2
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- 229920000573 polyethylene Polymers 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
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- 239000000919 ceramic Substances 0.000 description 1
- 238000007723 die pressing method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
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- 238000000034 method Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/06—Multi-stage pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/02—Selection of particular materials
- F04D29/026—Selection of particular materials especially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/046—Bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/12—Shaft sealings using sealing-rings
- F04D29/126—Shaft sealings using sealing-rings especially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2205—Conventional flow pattern
- F04D29/2222—Construction and assembly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a double-stage vertical side suction pump, which comprises a connecting bracket, motor and the pump body, the pump body is connected through the pump shaft between the motor, the other end stretches into pump body in-connection impeller, the pump body comprises the two-stage pump body that the series connection piles up each other, the first order pump body includes one-level pump case and one-level pump cover, the second level pump body includes second grade pump case and second grade pump cover, the sealed crimping of one-level pump case is on second grade pump cover, the sunction inlet tee bend includes through-hole and the sunction inlet on the lateral wall from top to bottom, the top of the last through-hole of sunction inlet tee bend is installed to the shaft seal subassembly, lower through-hole bottom and one-level pump cover sealing connection, the impeller includes one-level impeller and second grade impeller, install respectively in one-level pump case and second grade pump case, shaft seal subassembly below is provided with a cavity section, form and deposit the air cavity, nearly bottom is provided with the liquid seal dish in the one-level pump case, the last second grade pump case feed liquor hole of having seted up of liquid seal dish. The invention has small volume, difficult abrasion of shaft seal, high outlet pressure and convenient installation.
Description
Technical Field
The invention relates to a vertical centrifugal slurry pump, in particular to a double-stage side suction pump.
Background
The pressure filter pressure feed centrifugal pump is a slurry conveying centrifugal pump commonly used in the filtration industry. Such centrifugal pumps have two different phases of requirements in operation: the filter press requires large flow transmission when filling, requires small flow and high pressure transmission when the filter press forces pressure, and requires transmission pressure to reach about 1-1.3MPa when the pressure is forced. The conventional centrifugal pump hardly reaches such requirement, and chinese patent publication No. cn03220342.x discloses an improved two-stage centrifugal pump, the utility model discloses an improvement to two-stage centrifugal pump especially relates to the improvement of two-stage centrifugal pump case, and characterized by centrifugal pump double volute is by two helices that metal barrel and polymer lining layer formed are the same, constitute the opposite phase volute that sets up dorsad, and the bilobed wheel is put the setting in two opposite phase volutes dorsad to and adopt two pumps of external pipe intercommunication. The integral pump shell with the double volutes arranged in the back is convenient for cantilever installation. The suction inlet of the backing pump is arranged at the shaft sealing side of the pump, so that the service life of the shaft seal is greatly prolonged. The utility model is particularly suitable for slurry with high conveying pressure requirement and strong corrosivity and abrasiveness. The centrifugal pump can meet the pressurizing requirement of a conventional plate-and-frame filter press in the aspect of conveying pressure, but has the following defects: the shaft seal directly contacts the conveyed slurry, and particles of the slurry enter the friction surfaces of the dynamic ring and the static ring of the shaft seal, so that the friction surfaces are extremely easy to damage.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the two-stage vertical side suction pump which is small in size, not easy to wear a shaft seal, high in outlet pressure and convenient to install.
In order to realize the purpose of the invention, the following technical scheme is provided: a two-stage vertical side suction pump comprises a connecting support, a motor and a pump body, wherein the pump body is connected with the motor through a pump shaft, a shaft head at one end of the pump shaft is connected with a shaft head of the motor, the other end of the pump body extends into the pump body and is connected with an impeller, the pump body comprises two stages of pump bodies which are mutually stacked in series, a first stage pump body comprises a first stage pump shell and a first stage pump cover, a second stage pump body comprises a second stage pump shell and a second stage pump cover, the first stage pump shell is connected with the second stage pump cover in a sealing and pressing mode, a suction inlet tee comprises an upper through hole, a lower through hole and a suction inlet on the side wall, a shaft sealing assembly is arranged at the top end of the upper through hole of the suction inlet tee, the bottom end of the lower through hole is connected with the first stage pump cover in a sealing mode, the impeller comprises a first stage impeller and a second stage impeller which are respectively arranged in the first stage pump shell and the second stage pump shell, and is characterized in that a cavity section is arranged below the shaft sealing assembly to form an air storage cavity, and a liquid sealing disc is arranged near the bottom end in the first stage pump shell, the liquid sealing disc is provided with a second-stage pump shell liquid inlet hole, the second-stage pump shell liquid inlet hole is communicated with a second-stage pump shell cavity, slurry in the first-stage pump shell enters the second-stage pump shell, and the shaft seal of the shaft seal assembly is mechanical seal or magnetic type mechanical seal for driving the static ring.
Preferably, the air storage cavity is a section of cavity section near the top end of the through hole on the suction inlet tee joint, and the cavity section is in air contact with the shaft sealing assembly.
Preferably, the inner wall of the sleeve body or the outer wall of the shaft sleeve of the pump shaft is provided with a spiral convex strip or a spiral groove. Through the arrangement, the air storage cavity can form a fluid negative pressure area, and negative pressure fluid can suck air in the air cavity in the sleeve body into a negative pressure state, so that the effect of mechanical seal on the pump shaft is changed into: the air outside the pump body is prevented from being sucked into the negative pressure air of the pump cavity, so that the substance and the pressure field at the shaft seal position in the pump are changed, the fluid at the original seal position becomes air, the original seal position is a negative pressure area changed from positive pressure, and the service life of the mechanical seal can be effectively prolonged.
Preferably, the bottom opening extends to a fluid negative pressure area between the suction inlet tee joint and the suction inlet of the pump cover, and a channel between the sleeve body and the pump shaft forms an air storage cavity.
The fluid negative pressure area is specifically explained as follows:
1. in the first case: the vertical pump is under the influence of the suction of the impeller, and the whole area between the suction inlet tee joint and the suction inlet of the pump cover is in a state of high fluid negative pressure;
2. in the second situation, when the fluid pressure at the inlet is greater than 0.02MPA and the outlet flow is less than one third of the designed flow, the pressure in the suction inlet tee joint is increased to the same level as the inlet pressure, and only the suction inlet of the pump cover can generate a relative fluid negative pressure area due to the suction effect of the impeller.
Preferably, the inner wall of the sleeve body near the top end is provided with an annular groove, and a lip-shaped sealing ring is arranged in the groove.
Preferably, a lip seal is provided below the shaft seal assembly. Most preferably, the inner wall of the long sleeve close to the top end is provided with an annular groove, and a lip-shaped sealing ring is arranged in the annular groove. In order to prevent the impact of water hammer on the machine seal caused by the rapid backflow of high-pressure fluid in the filter press when the pump machine is stopped.
Preferably, the liquid sealing disc and the inner liner in the first-stage pump shell are integrally formed, and the liquid sealing disc comprises a disc body, a central hole which is formed in the center of the disc body and used for penetrating through the pump shaft, and at least one through hole which is formed in the surface of the disc body, wherein the through hole forms a liquid inlet hole of the second-stage pump shell.
Preferably, the through hole is a vertical through hole or an inclined hole with an inwardly inclined cross section. The inclined form is arranged to reduce the resistance of the fluid and is beneficial to improving the conveying efficiency of the pump.
Preferably, the lower surface of the disc body is arrayed with a plurality of radial liquid guide rib plates around the circle center, and liquid guide channels are formed between adjacent liquid guide rib plates. Preventing the overflowing liquid from rotating.
Preferably, the liquid sealing disc and the inner liner in the first-stage pump shell are integrally formed, the liquid sealing disc comprises a disc body, a central hole used for penetrating the pump shaft in the center of the disc body and an inverted U-shaped edge protruding upwards on the edge of the disc body, the inverted U-shaped edge forms an annular cavity with a sealed top end and an open lower end, a plurality of through holes are formed in the inner side wall of the inverted U-shaped edge around the circle center of the disc body, and the through holes form a liquid inlet hole of the second-stage pump shell.
Preferably, the through holes are formed along the tangential direction of the arc of the side wall of the inner layer.
Preferably, a wind wheel is arranged on the pump shaft above the mechanical seal. In order to further prolong the service life of the mechanical seal, the temperature of the mechanical seal part is reduced.
Preferably, the connecting part of the motor shaft head and the pump shaft head is additionally provided with an axial float prevention coupling mechanism, the axial float prevention coupling mechanism comprises a connecting support and a bearing frame, the connecting support is used for mounting a motor and a centrifugal pump body, the bearing frame comprises a base body, a bearing culvert arranged on the base body, a bearing and a bearing gland are arranged in the bearing culvert, the bearing is sleeved on the shaft head of the pump shaft and is fixedly mounted in the bearing culvert, the bearing frame and the connecting support are of an integrated or split type combined structure, and the motor mounting plate and the connecting support are fixedly mounted.
Preferably, the pump shaft is provided with a shaft sleeve.
In order to realize the purpose of the invention, another technical scheme is provided: a two-stage vertical side suction pump comprises a connecting support, a motor and a pump body, wherein the pump body is connected with the motor through a pump shaft, the shaft head at one end of the pump shaft is connected with the shaft head of the motor, the other end of the pump body extends into the pump body and is connected with an impeller, the pump body comprises two stages of pump bodies which are mutually connected in series and stacked, the first stage pump body comprises a first stage pump shell and a first stage pump cover, the second stage pump body comprises a second stage pump shell and a second stage pump cover, the first stage pump shell is connected with the second stage pump cover in a sealing and pressing mode, a suction inlet tee comprises an upper through hole, a lower through hole and a suction inlet on the side wall, a shaft sealing assembly is arranged at the top end of the upper through hole of the suction inlet tee, the bottom end of the lower through hole is connected with the first stage pump cover in a sealing mode, the impeller comprises a first stage impeller and a second stage impeller which are respectively arranged in the first stage pump shell and the second stage pump shell, the pump is characterized in that a cavity section is arranged below the shaft sealing assembly to form an air storage cavity, and an inner cavity connected with a secondary pump shell is arranged outside the primary pump shell through a liquid pipeline.
Preferably, the air storage cavity is a section of cavity section near the top end of the through hole on the suction inlet tee joint, and the cavity section is in air contact with the shaft sealing assembly.
Preferably, the inner wall of the sleeve body or the outer wall of the shaft sleeve of the pump shaft is provided with a spiral convex strip and/or a spiral groove.
Preferably, the bottom opening extends to a fluid negative pressure area between the suction inlet tee joint and the suction inlet of the pump cover, and a channel between the sleeve body and the pump shaft forms an air storage cavity.
The invention has the beneficial effects that:
the pump body adopts a vertical structure, two pump shells are combined and overlapped, and two impellers work to achieve the effect of pressurizing twice, so that the pressure of the fluid conveyed by the centrifugal pump can meet the requirement of pressurizing and feeding of a plate-and-frame filter press. Meanwhile, an air storage cavity is arranged below the shaft sealing assembly, and air in the pump cavity is stored in the air storage cavity in a floating mode under the action of gravity, so that the mechanical seal of the shaft sealing assembly is not in contact with conveyed slurry, the mechanical seal can work in a clean environment, and the service life of the mechanical seal can be effectively prolonged.
Two, carry out the mutual independence of two pump chambers sealed through setting up the liquid seal dish between two pump casings to through set up the inlet on the liquid seal dish, realize in the ground paste of one-level pump casing flows into the second grade pump casing, realize further pressurization in the second grade pump casing, overcome the outer problem of adorning the pipeline bulky, vertical installation difficulty of dress.
Thirdly, add on the basis of prior art and prevent the axle drunkenness structure, fixed the pump shaft through bearing and bearing box, make it unable radial and axial drunkenness to changed the structure and the characteristic of associated centrifugal pump, overcome the easy drunkenness of the axial of the associated centrifugal pump that exists for a long time, the axle that causes seals the movable ring, the tight resultant force of quiet ring is unstable, and then causes the mechanical seal to damage the problem, can make the associated centrifugal pump have the collection dress function again, make all parts of the working end of centrifugal pump be in the same place, convenient the storage and transportation of product, installation, promoted the centrifugal pump use efficiency.
Through the improvement, the mechanical seal of the slurry pump with the conveying pressure of 0.8-1.2MPa is not easy to damage, and the sealing safety of the pump is improved. The vertical double-suction centrifugal pump structure is adopted, the installation volume of the feeding pump of the filter press is reduced, the manufacturing cost is reduced, the pump shell of the steel lining plastic structure is adopted, and the ultrahigh-component polyethylene is selected as the lining layer, so that the pressurizing feeding pump of the filter press can resist wear and pressure. An air cavity is reserved at the sealing part of the pump shaft, so that air is accumulated in the air cavity, conveyed slurry does not contact with the mechanical seal, the mechanical seal is not washed by the slurry, and the service life of the mechanical seal is prolonged.
Drawings
FIG. 1 is a front view of embodiment 1.
FIG. 2 is a perspective view of the primary pump body of FIG. 1.
FIG. 3 is a perspective view of the primary pump body of FIG. 1.
Fig. 4 is a partial cross-sectional view of fig. 2.
FIG. 5 is a front view of embodiment 2.
FIG. 6 is a perspective view of the first stage pump body of FIG. 5.
Fig. 7 is a partial cross-sectional view of fig. 5.
FIG. 8 is a front view of embodiment 3.
FIG. 9 is a perspective view of the first stage pump body of FIG. 8.
FIG. 10 is an isometric view of the first stage pump body of FIG. 8.
Fig. 11 is a partial cross-sectional view of fig. 8.
FIG. 12 is a top view of the primary pump body of embodiment 4.
Fig. 13 is a partial cross-sectional view of fig. 12.
FIG. 14 is a partial schematic view of a shaft seal assembly.
Fig. 15 is a schematic view of the mechanical seal of fig. 14.
FIG. 16 is a schematic structural view of example 5.
FIG. 17 is a schematic structural view of embodiment 6.
FIG. 18 is a schematic structural view of example 7.
Detailed Description
Example 1: as shown in figures 1-4, a two-stage vertical side suction pump comprises a connecting bracket 1, a motor 2 and a pump body 3, wherein the pump body 3 is connected with the motor 2 through a pump shaft 4, a shaft head at one end of the pump shaft 4 is connected with a shaft head of the motor, the other end extends into the pump body 3 to be connected with an impeller, the pump body 3 comprises two stages of pump bodies which are mutually stacked in series, the first stage of pump body comprises a first stage pump shell 3.1.1 and a first stage pump cover 3.1.2, the second stage of pump body comprises a second stage pump shell 3.2.1 and a second stage pump cover 3.2.2, the first stage pump shell 3.1.1 is sealed and pressed on the second stage pump cover 3.2.2, a suction inlet tee 6 comprises upper and lower through holes 6.1 and 6.2 and a suction inlet 6.3 on a side wall, a shaft sealing component 7 is arranged at the top end of the upper through hole 6.1 of the suction inlet tee, the bottom through hole 6.2 is sealed and connected with the first stage pump cover 3.1.2, the impeller 5 comprises a first stage impeller 5.1 and a second stage impeller 5.2 which are respectively arranged in the first stage pump shell 3.1 and the second stage pump shell 3.2.1, a cavity section is arranged below the shaft sealing component 7 to form an air storage cavity 8, a liquid sealing disc 9 is arranged near the bottom end in the first-stage pump case 3.1.1, a second-stage pump case liquid inlet hole 9.3 is formed in the liquid sealing disc 9, the first-stage pump case 3.1.1 cavity is communicated through the second-stage pump case liquid inlet hole 9.3, slurry in the first-stage pump case 3.1.1 enters the second-stage pump case 3.2.1, and the shaft sealing of the shaft sealing component 7 is mechanical sealing 7.1 for driving a static ring. The air storage cavity 8 is a section of cavity section near the top end of a through hole 6.1 on the suction inlet tee joint, and the cavity section is in air contact with a mechanical seal 7.1 driving the static ring. The liquid sealing disc 9 and the inner lining layer in the first-stage pump shell 3.1.1 are integrally formed, the liquid sealing disc comprises a disc body 9.1, the center of the disc body 9.1 is used for penetrating through a center hole 9.2 of the pump shaft 4, a through hole 9.3 is formed in the surface of the disc body 9.1, the through hole 9.3 forms a liquid inlet hole of the second-stage pump shell, the through hole 9.3 is a vertical through hole, a plurality of radial liquid guide rib plates 9.4 are arrayed on the lower surface of the disc body 9.1 around the circle center, and liquid guide channels are formed between the adjacent liquid guide rib plates 9.4. The primary impeller 5.1 is provided with a raised liquid sealing ring 5.1.1, and the surface of the liquid sealing disc 9 is correspondingly provided with a groove 9.5 coupled with the liquid sealing ring.
The connecting part of the motor shaft head and the pump shaft head is additionally provided with an axial float prevention coupling mechanism 11, the axial float prevention coupling mechanism 11 comprises a connecting support 1 and a bearing frame 12, the connecting support is used for mounting a motor 2 and a centrifugal pump body 3, the bearing frame 12 comprises a base body 12.1, a bearing culvert 12.2 is arranged on the base body 12.1, a bearing 12.3 and a bearing gland 12.4 are arranged in the bearing culvert 12.2, the bearing 12.3 is sleeved on the shaft head of the pump shaft 4, the bearing 12.3 is fixedly mounted in the bearing culvert 12.3, the bearing frame 12 and the connecting support 1 are of a split type combined structure, and a motor mounting disc 13 is fixedly mounted with the connecting support 1. The tail end of the connecting support 1 is fixedly connected with the top end of the first-stage pump shell 3.1.1 through a bolt, and the tail end of the first-stage pump shell 3.1.1 is fixedly connected with the top end of the second-stage pump shell 3.2.1 through a bolt. The bottom end of the second-stage pump shell 3.2.1 is provided with a base 14 which is fixedly connected with the bottom end bolt of the second-stage pump shell 3.2.1.
Example 2: referring to fig. 5-7, referring to embodiment 1, the remaining features are unchanged, the air storage chamber 8 is a long sleeve 15 disposed below the shaft seal assembly 7 and sleeved on the outer periphery of the pump shaft 4 in the suction inlet tee 6, the top end of the long sleeve 15 is hermetically connected with the suction inlet tee 6, the bottom end opening extends to a fluid negative pressure region between the suction inlet tee 6 and the suction inlet of the primary pump cover 3.1.3, and a passage between the long sleeve 15 and the pump shaft 4 forms the air storage chamber 8. An annular groove is arranged on the inner wall of the long sleeve 15 close to the top end, and a lip-shaped sealing ring 16 is arranged in the annular groove. The through hole 9.3 on the tray body 9.1 of the liquid sealing tray 9 is an inclined hole with an inward inclined section. The tail end of the connecting support 1 is pressed at the top end of the primary pump cover 3.1.2, the tail end of the connecting support 1 is fixedly connected with the top end of the secondary pump shell 3.2.1 through bolts, and the primary pump body is pressed between the connecting support 1 and the secondary pump body. The bottom end of the second-stage pump shell 3.2.1 is provided with a base which is fixedly connected with the bottom end bolt of the second-stage pump shell 3.2.1. And a wind wheel 10 is arranged on the pump shaft 4 above the mechanical seal 7.1.
Example 3: referring to fig. 8-11, referring to embodiment 1, the remaining features are unchanged, the air storage chamber 8 is a long sleeve 15 disposed below the shaft seal assembly 7 and sleeved on the outer periphery of the pump shaft 4 in the suction inlet tee 6, the top end of the long sleeve 15 is connected with the suction inlet tee 6 in a sealing manner, the bottom end opening extends to a fluid negative pressure region between the suction inlet tee 6 and the suction inlet of the pump cover 3.1.2, and a channel between the long sleeve 15 and the pump shaft 4 forms the air storage chamber 8. An annular groove is arranged on the inner wall of the long sleeve 15 close to the top end, and a lip-shaped sealing ring 16 is arranged in the annular groove. The liquid sealing disc 9 and the inner liner in the first-stage pump shell 3.1.1 are integrally formed, the liquid sealing disc 9 comprises a disc body 9.1, the center of the disc body 9.1 is used for penetrating through a central hole 9.2 of a pump shaft, the edge of the disc body 9.1 is provided with an inverted U-shaped edge 9.6 protruding upwards, the inverted U-shaped edge 9.6 forms a top end seal, the lower end of the annular cavity 17 is provided with an opening, a plurality of through holes 9.7 are formed in the inner side wall of the inverted U-shaped edge 9.6 around the circle center of the disc body 9.1, and the through holes 9.7 form a second-stage pump shell liquid inlet hole of the second-stage pump shell.
Example 4: referring to example 3 of fig. 12-15, the remaining features are unchanged, and the through holes 9.7 are opened along the tangential direction of the inner layer sidewall arc. The shaft seal assembly 7 comprises a seal box 7.2 and moving and static rings 7.1.1 and 7.1.2, an oil storage cavity 7.2.1 is arranged on the seal box 7.2, and grease is filled in the oil storage cavity 7.2.1 to lubricate the mechanical seal.
Example 5: referring to example 2, as shown in fig. 16, the remaining features are unchanged, and the inner wall of the long sleeve 15 is provided with a spiral convex strip 15.1.
Embodiment 7, as shown in fig. 18, referring to embodiment 2, the remaining features are unchanged, the inner wall of the long sleeve 15 is provided with a spiral convex strip 15.1 and the inner wall of the pump shaft sleeve 4.1 is provided with a spiral groove strip 4.1.1.
In the above embodiments 1 to 7, the mechanical seal may be a magnetic-attraction type mechanical seal.
The pump shell, the pump cover, the suction inlet tee joint and the impeller are made of steel-plastic composite structures, the plastics of the steel-plastic composite structures are made of polyethylene with the molecular weight of 500 ten thousand, and the plastic composite structures are manufactured and processed by a conventional hot die pressing process. Other parts can also be manufactured and obtained by the conventional centrifugal pump processing, production and manufacturing processes. Bolts, nuts and machine seals of all the parts can be obtained in a commercially available mode.
The liquid sealing disc structure can also be suitable for serial liquid inlet between two or more stages of pump bodies.
The material of the flow passage component can also be selected from other materials such as metal, ceramic, resin, rubber and the like.
Claims (14)
1. A two-stage vertical side suction pump comprises a connecting support, a motor and a pump body, wherein the pump body is connected with the motor through a pump shaft, a shaft head at one end of the pump shaft is connected with a shaft head of the motor, the other end of the pump body extends into the pump body and is connected with an impeller, the pump body comprises two stages of pump bodies which are mutually stacked in series, a first stage pump body comprises a first stage pump shell and a first stage pump cover, a second stage pump body comprises a second stage pump shell and a second stage pump cover, the first stage pump shell is connected with the second stage pump cover in a sealing and pressing mode, a suction inlet tee comprises an upper through hole, a lower through hole and a suction inlet on the side wall, a shaft sealing assembly is arranged at the top end of the upper through hole of the suction inlet tee, the bottom end of the lower through hole is connected with the first stage pump cover in a sealing mode, the impeller comprises a first stage impeller and a second stage impeller which are respectively arranged in the first stage pump shell and the second stage pump shell, and is characterized in that a cavity section is arranged below the shaft sealing assembly to form an air storage cavity, and a liquid sealing disc is arranged near the bottom end in the first stage pump shell, the liquid sealing disc is provided with a second-stage pump shell liquid inlet hole which is communicated with the second-stage pump shell cavity, so that slurry in the first-stage pump shell enters the second-stage pump shell, and the shaft seal of the shaft seal assembly is a mechanical seal or a magnetic type mechanical seal for driving the static ring.
2. The dual stage vertical side suction pump according to claim 1, wherein the air storage chamber is a section of the suction inlet tee near the top of the through hole, the section of the chamber being in air contact with the shaft seal assembly.
3. The two-stage vertical side suction pump according to claim 1, wherein the air storage chamber is a sleeve body which is arranged below the shaft seal assembly and sleeved on the outer periphery of the pump shaft in the suction inlet tee, and the top end of the sleeve body is connected with the suction inlet tee in a sealing manner.
4. The two-stage vertical side suction pump according to claim 3, wherein the inner wall of the housing or the outer wall of the sleeve of the pump shaft is provided with a spiral rib and/or a spiral groove.
5. The two-stage vertical side suction pump as claimed in claim 3, wherein the bottom opening extends to the fluid negative pressure region between the suction inlet tee and the suction inlet of the pump cover, and the channel between the sleeve body and the pump shaft forms an air storage chamber.
6. The two-stage vertical side suction pump according to claim 3, wherein a lip seal is provided below the shaft seal assembly.
7. The two-stage vertical side suction pump according to claim 1, wherein the liquid sealing disc is integrally formed with the inner liner in the first-stage pump casing, and comprises a disc body, a central hole at the center of the disc body for passing through the pump shaft, and at least one through hole formed in the surface of the disc body, wherein the through hole forms a liquid inlet hole of the second-stage pump casing.
8. The two-stage vertical side suction pump according to claim 7, wherein the through hole is a vertical through hole or an inclined hole with an inwardly inclined cross section.
9. The two-stage vertical side suction pump according to claim 7, wherein the lower surface of the disc body is arrayed with a plurality of radial liquid guide rib plates around the center of a circle, and liquid guide channels are formed between adjacent liquid guide rib plates.
10. The two-stage vertical side suction pump according to claim 1, wherein the liquid sealing disk is integrally formed with the inner liner in the first-stage pump casing, the liquid sealing disk comprises a disk body, a central hole for passing through the pump shaft in the center of the disk body, and an inverted U-shaped edge protruding upwards on the edge of the disk body, the inverted U-shaped edge forms a top seal and an annular cavity with an open lower end, a plurality of through holes are formed in the inner side wall of the inverted U-shaped edge around the center of the disk body, and the through holes form a liquid inlet hole of the second-stage pump casing in the second-stage pump casing.
11. The two-stage vertical side suction pump according to claim 10, wherein the through holes are formed along a tangent of the arc of the sidewall of the inner layer.
12. The two-stage vertical side suction pump according to claim 1, wherein a wind wheel is arranged on the pump shaft above the mechanical seal.
13. The two-stage vertical side suction pump according to claim 1, characterized in that an axial float prevention coupling mechanism is additionally arranged at the joint of the motor shaft head and the pump shaft head, the axial float prevention coupling mechanism comprises a coupling bracket and a bearing bracket for mounting the pump bodies of the motor and the centrifugal pump, the bearing bracket comprises a base body, a bearing culvert arranged on the base body, a bearing and a bearing gland arranged in the bearing culvert, the bearing is sleeved on the shaft head of the pump shaft, the bearing is fixedly mounted in the bearing culvert, the bearing bracket and the coupling bracket are of an integrated or split type combined structure, and the motor mounting plate and the coupling bracket are fixedly mounted.
14. The two-stage vertical side suction pump according to claim 1, wherein the pump shaft is provided with a shaft sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210401087.8A CN114876809A (en) | 2022-04-18 | 2022-04-18 | Two-stage vertical side suction pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210401087.8A CN114876809A (en) | 2022-04-18 | 2022-04-18 | Two-stage vertical side suction pump |
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| CN114876809A true CN114876809A (en) | 2022-08-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210401087.8A Pending CN114876809A (en) | 2022-04-18 | 2022-04-18 | Two-stage vertical side suction pump |
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| CN210509604U (en) * | 2019-07-16 | 2020-05-12 | 君禾泵业股份有限公司 | High-pressure relief detachable multi-stage centrifugal submersible pump |
| CN112324699A (en) * | 2020-11-22 | 2021-02-05 | 宜兴市宙斯泵业有限公司 | Slurry vertical centrifugal pump |
| CN215595976U (en) * | 2021-08-30 | 2022-01-21 | 百鸿国际机械(上海)有限公司 | Bearing structure of high-power direct-connected centrifugal pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203081859U (en) * | 2012-11-29 | 2013-07-24 | 大连四方佳特流体设备有限公司 | Vertical type double-cylinder-body multilevel split centrifugal pump |
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