CN209856040U - Multistage canned motor pump and use its water delivery system - Google Patents
Multistage canned motor pump and use its water delivery system Download PDFInfo
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- CN209856040U CN209856040U CN201920705791.6U CN201920705791U CN209856040U CN 209856040 U CN209856040 U CN 209856040U CN 201920705791 U CN201920705791 U CN 201920705791U CN 209856040 U CN209856040 U CN 209856040U
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Abstract
The structure has the characteristics of high operation reliability, low vibration, no leakage, no need of maintenance and reduction of hydraulic loss, and can be widely applied to various water delivery systems such as circulation or pressurization. In the multi-stage shield pump, a cavity at the lower end of a motor rotor is connected with a water outlet channel at the water outlet position of a final-stage impeller through an inner ring runner of a middle bearing to form a high-pressure water chamber; the upper end cavity of the motor rotor is connected with a secondary high-pressure stable flow area formed between the last-stage impeller and the next-stage impeller and a guide vane partition plate through a flow passage of the upper end bearing and a circulating water flow passage at the center of the motor rotor so as to form a secondary high-pressure water chamber.
Description
Technical Field
The utility model relates to a high-lift water delivery system technical field particularly, relates to a multistage canned motor pump and use its water delivery system.
Background
In order to meet the requirement of high lift of a water delivery system, a multistage centrifugal pump is generally adopted as power equipment. The conventional multistage centrifugal pump usually adopts mechanical seal or packing seal, and the phenomenon of leakage caused by seal abrasion failure can be inevitable when the multistage centrifugal pump operates for a certain time, so that the working environment is influenced, potential safety hazards are generated, and high maintenance cost is generated. Meanwhile, a ball bearing of the motor matched with the common multistage centrifugal pump is lubricated by lubricating grease, the bearing needs to be oiled by manpower regularly, the maintenance cost of the water pump in operation is greatly improved, and the major accident that the motor is burnt out due to dry grinding of the bearing caused by negligence of an oiling maintenance period is very easy to occur.
Along with the improvement of requirements of users on silence, no leakage, maintenance-free and the like of a water pump, at present, a plurality of users gradually adopt a multi-stage shield pump as water delivery power equipment in a high-lift water delivery system. At present, some canned motor pumps employ a method of taking high-pressure liquid from a high-pressure water chamber at the outlet of the pump, cooling the motor and lubricating the bearing, and then discharging circulating water from a shaft center hole to an impeller suction inlet. The disadvantage of this method is that when high pressure water is discharged into the low pressure area of the impeller suction inlet, it will cause a great disturbance to the water flow at the impeller suction inlet. Meanwhile, the high-pressure water chamber at the outlet of the impeller at the tail end of the structure is directly communicated to the suction inlet of the first-stage impeller in a thin tube form, so that high pressure generated after the multi-stage impeller works is directly released, and the high pressure loss at the outlet of the water pump and the low efficiency of the water pump are caused.
In addition, most of the existing multistage canned pumps adopt a split design method of a motor shaft and a water pump shaft, although the manufacturing is relatively easy, the alignment of the two shafts is poor, and the problems that the operation stability of the pump is affected by large vibration, accelerated abrasion of a motor and a pump bearing and the like can occur when the pump rotates at a high speed. In addition, the dead weight of the rotor part of the multistage shield pump and the multiplied axial force acting on the multistage impeller enable the bearing to bear a large load and be easily damaged, and therefore the operation safety and durability of the pump are reduced. In general, current multi-stage canned motor pump technology has yet to be improved. Especially, as the requirement on the efficiency of the canned motor pump is improved and the canned motor pump is selected for use in some occasions with higher requirements on reliability, the existing technology of the multistage centrifugal pump and the canned motor pump cannot meet the requirements of users in the aspects of the stability of pump operation, the rationality of hydraulic design and the like.
In order to optimize the structural design method of the multistage canned motor pump, a more suitable novel multistage canned motor pump needs to be designed, and the multistage canned motor pump has the characteristics of higher operation reliability, low vibration, no leakage, no maintenance, high efficiency and the like, so that the requirements of various water delivery systems such as circulation, pressurization and the like on the multistage canned motor pump are met.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a multistage canned motor pump and use its water delivery system, in particular to multistage canned motor pump of the integrative coaxial coupling's of pump machine high reliability, this structure have operational reliability high, the vibration is low, do not have the leakage, need not to maintain and reduce hydraulic loss's characteristics, can wide application in various water delivery systems such as circulation or pressure boost.
The embodiment of the utility model is realized like this:
a multi-stage canned motor pump comprises a water inlet and outlet base provided with a pump water inlet and a pump water outlet, wherein the water inlet and outlet base is connected with a first-stage impeller, and a middle impeller and a last-stage impeller are sequentially accumulated above the first-stage impeller; a first-stage guide vane is arranged outside the first-stage impeller, a middle guide vane is arranged outside the middle impeller, and a last-stage guide vane is arranged outside the last-stage impeller; a water outlet channel is formed between the first-stage guide vane, the middle guide vane and the last-stage guide vane and the pressure-resistant cylinder, a motor base, a motor stator and a stator shielding sleeve are connected above the water outlet channel through a pump cover, a rotor shaft, a motor rotor and a rotor shielding sleeve are mounted in the middle of the motor stator, and a sealing gap between a high-pressure water chamber and a secondary high-pressure water chamber is formed between the rotor shielding sleeve and the stator shielding sleeve; a multistage impeller is arranged in the lower end area of the rotor shaft, and a circulating water flow channel is arranged in the center of the motor rotor; the cavity at the lower end of the motor rotor is connected with the water outlet channel at the water outlet position of the final-stage impeller through an inner ring flow channel of the middle bearing to form the high-pressure water chamber; and the upper end cavity of the motor rotor is connected with a secondary high-pressure stable area formed between the last-stage impeller and the next-stage impeller and a guide vane partition plate through a flow channel of an upper end bearing and the circulating water flow channel at the center of the motor rotor so as to form the secondary high-pressure water chamber.
In a preferred embodiment of the present invention, the motor rotor is wrapped by the rotor shielding sleeve and fixed on the rotor shaft; the motor stator is wrapped by the stator shielding sleeve and is fixed in the motor base.
In a preferred embodiment of the present invention, the motor rotor, the rotor shielding sleeve, the motor stator and the stator shielding sleeve are coaxially disposed with the motor shaft; the rotor shielding sleeve and the stator shielding sleeve form the high-pressure water chamber and the secondary high-pressure water chamber, and the sealing gap is 0.05-1.0 mm.
In the preferred embodiment of the present invention, the motor rotor is supported by the upper end bearing, the middle bearing and the auxiliary bearing at the lower end, and the bearing friction pair is made of silicon carbide, ceramic or hard alloy material.
In the preferred embodiment of the present invention, a bushing capable of automatically expanding and contracting with temperature is installed between the shaft sleeve and the shaft of the motor rotor.
In a preferred embodiment of the present invention, the motor rotor is provided with a flexible pad capable of automatic compensation between the thrust plate and the thrust plate holder.
In the preferred embodiment of the present invention, the motor shaft and the water pump shaft are integrally formed and coaxially connected.
In a preferred embodiment of the present invention, the upper end bearing is provided with a first groove, and the first groove is a straight groove or a spiral groove; the auxiliary bearing is provided with a second groove, and the second groove is a straight groove or a spiral groove.
In a preferred embodiment of the present invention, the outer surface and/or the inner surface of the rotor of the electric machine is provided with a spiral channel.
In the preferred embodiment of the present invention, the high pressure water chamber includes a high pressure water chamber B chamber, the sub high pressure water chamber includes a sub high pressure water chamber B chamber, and the upper and lower end surfaces of the motor rotor respectively include the sub high pressure water chamber B chamber and the high pressure water chamber B chamber.
In a preferred embodiment of the present invention, the multistage canned motor pump further includes: a first-stage impeller suction inlet and a circulating water outlet; liquid from the water inlet of the pump enters the primary impeller through the suction inlet of the primary impeller; and liquid flowing downwards through the circulating water flow channel flows out of the circulating water outlet of the secondary high-pressure stable flow area formed between the guide vane partition plate and the middle impeller.
It should be added here that, in the multi-stage canned motor pump provided in the embodiments of the present invention, the main water chamber is also a high-pressure water chamber, and the secondary water chamber is also a secondary high-pressure water chamber; the stable flow area is also called a sub-high pressure stable flow area.
A water delivery system comprising a multistage canned motor pump as described in any preceding claim.
The embodiment of the utility model provides a beneficial effect is:
firstly, an internal circulation cooling water structure is adopted, part of water flow in a high-pressure water chamber enters the interior of a shielding motor through a lower bearing gap to take away the heat of the motor, then flows into a circulation water chamber through an upper bearing gap, and flows out from a secondary high-pressure steady flow region between a last-stage impeller and a next-stage impeller through a circulation water channel at a central hole of a rotor; because the circulating water flow outlet is positioned in the stable flow area below the final-stage impeller, the water flow cannot be interfered, and the pressure difference between the circulating water inlet and the circulating water outlet is very low, so that the water pump not only can cool and shield the motor and lubricate an upper sliding bearing and a lower sliding bearing, but also cannot cause large-pressure-difference pressure-relief loss to a high-pressure water chamber, and the efficiency of the water pump is effectively improved;
a sealing gap is formed between the rotor shielding sleeve and the stator shielding sleeve, a high-pressure water chamber is arranged on the lower side of the rotor, and a secondary high-pressure water chamber is arranged on the upper side of the rotor; the axial force acting on the rotor is upward, so that part of the dead weight of the rotor and the downward axial force generated by the multistage impellers can be counteracted, the axial force acting on the thrust bearing can be effectively reduced, and the service life of the thrust bearing is prolonged;
thirdly, a friction pair of a supporting bearing of the canned motor pump is made of high-hardness high-wear-resistance silicon carbide, ceramics or hard alloy materials, a bushing capable of automatically expanding and contracting along with the temperature is arranged between a shaft sleeve and a shaft, and a flexible pad capable of automatically compensating along with the temperature change is also arranged between a thrust plate and a thrust plate support, so that the influence on the shaft sleeve and the bearing caused by the temperature change of the conveyed liquid is greatly reduced, and the application range and the reliability of the operation of the canned motor pump are improved;
and fourthly, the motor shaft and the water pump shaft are coaxially connected in an integrated processing manner, so that the centering performance is better, the operation is stable, the vibration is small, the safety and the reliability are realized, and the structure is more compact.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic main sectional structure diagram of a multistage canned motor pump provided in an embodiment of the present invention;
FIG. 2 is a schematic sectional view of the end face A-A in FIG. 1;
fig. 3 is a schematic main sectional structure diagram of a secondary high-pressure water chamber area in the multi-stage canned motor pump provided in the embodiment of the present invention;
fig. 4 is a schematic main sectional structure diagram of a high-pressure water chamber region in a multistage canned motor pump provided by an embodiment of the present invention.
In the figure:
1-water inlet and outlet base, 2-pump water inlet, 3-first stage impeller suction inlet, 4-first stage guide vane, 5-first stage impeller, 6-auxiliary bearing, 7-middle impeller, 8-middle guide vane, 9-last stage impeller, 10-last stage guide vane, 11-pump cover, 12-motor base, 13-motor stator, 14-stator shielding sleeve, 15-rotor shielding sleeve, 16-circulating water flow channel, 17-time high pressure water cavity A chamber, 18-upper end bearing, 18 a-bushing, 18B-shaft sleeve, 18 c-thrust plate, 18 d-compensation pad, 18 e-thrust plate holder, 19-time high pressure water cavity B chamber, 20-sealing gap, 21-motor rotor, 22-rotor shaft, 23-high pressure water cavity B chamber, 24-middle bearing, 25-high pressure water cavity chamber, 26-guide vane baffle, 27-time high pressure stable flow region, 28-circulating water outlet, 29-pressure resistant cylinder, 30-water outlet channel, 31-pump outlet.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Referring to fig. 1 to 4, the present embodiment provides a multi-stage canned motor pump, which includes a water inlet and outlet base 1 having a pump water inlet 2 and a pump water outlet 31, the water inlet and outlet base 1 is connected to a first-stage impeller 5, and a middle impeller 7 and a last-stage impeller 9 are sequentially accumulated above the first-stage impeller 5; a first-stage guide vane 4 is arranged outside the first-stage impeller 5, a middle guide vane 8 is arranged outside the middle impeller 7, and a last-stage guide vane 10 is arranged outside the last-stage impeller 9; a water outlet channel 30 is formed between the first-stage guide vane 4, the middle guide vane 8 and the last-stage guide vane 10 and a pressure-resistant cylinder 29, a motor base 12, a motor stator 13 and a stator shielding sleeve 14 are connected above the water outlet channel 30 through a pump cover 11, a rotor shaft 22, a motor rotor 21 and a rotor shielding sleeve 15 are installed in the middle of the motor stator 13, and a sealing gap 20 of a high-pressure water chamber 25 and a secondary high-pressure water chamber is formed between the rotor shielding sleeve 15 and the stator shielding sleeve 14; a multistage impeller is arranged in the lower end area of the rotor shaft 22, and a circulating water flow channel 16 is arranged in the center of the motor rotor 21; the cavity at the lower end of the motor rotor 21 is connected with a water outlet channel 30 at the water outlet of the final-stage impeller 9 through an inner ring runner of the middle bearing 24 to form a high-pressure water chamber 25; the upper end cavity of the motor rotor 21 is connected with a secondary high-pressure stable flow area 27 formed between the last-stage impeller 9 and the next-stage impeller and a guide vane partition plate 26 through a flow passage of the upper end bearing 18 and a circulating water flow passage 16 at the center of the motor rotor 21 to form a secondary high-pressure water chamber.
In the preferred embodiment of the present invention, the motor rotor 21 is wrapped by the rotor shielding sleeve 15 and fixed on the rotor shaft 22; the motor stator 13 is wrapped by a stator shielding sleeve 14 and fixed in the motor base.
In the preferred embodiment of the present invention, the motor rotor 21, the rotor shielding sleeve 15, the motor stator 13 and the stator shielding sleeve 14 are all arranged coaxially with the motor shaft; and, a sealing gap 20 of a high-pressure water chamber 25 and a secondary high-pressure water chamber is formed between the rotor shielding sleeve 15 and the stator shielding sleeve 14, and the sealing gap 20 is 0.05-1.0 mm.
An internal circulation cooling water structure is adopted, part of water flow in the high-pressure water chamber enters the shielding motor through the lower bearing gap to take away the heat of the motor, then flows into the circulation water chamber through the upper bearing gap, and flows out of a secondary high-pressure steady flow region between the last-stage impeller and the next-stage impeller through a circulation water channel at the central hole of the rotor; because the circulating water flow outlet is positioned in the stable flow area below the final-stage impeller, the water flow cannot be interfered, the pressure difference between the circulating water inlet and the circulating water outlet is very low, the motor can be cooled and shielded, the upper sliding bearing and the lower sliding bearing can be lubricated, meanwhile, the high-pressure water chamber cannot be subjected to large-pressure-difference pressure relief loss, and the efficiency of the water pump is effectively improved.
In addition, a sealing gap is formed between the rotor shielding sleeve and the stator shielding sleeve, the lower side of the rotor is a high-pressure water chamber, the upper side of the rotor is a secondary high-pressure water chamber, when the pump normally operates, the high-pressure water chamber is filled with high-pressure liquid pressurized by the last-stage impeller, the pressure directly acts on the lower side of the rotor, and the secondary high-pressure water chamber with the same pressure as that at the suction inlet of the first-stage impeller is arranged above the rotor; the axial force acting on the rotor is upward, partial self weight of the rotor and downward axial force generated by the multistage impellers can be offset, and the axial force acting on the thrust bearing can be effectively reduced, so that the service life of the thrust bearing is prolonged.
In the preferred embodiment of the present invention, the motor rotor 21 is supported by the upper end bearing 18, the middle bearing 24 and the lower auxiliary bearing 6, and the bearing friction pair is made of high hardness and high wear resistance silicon carbide, ceramic or hard alloy material.
In the preferred embodiment of the present invention, a bushing 18a capable of automatically expanding and contracting with temperature is installed between the shaft sleeve 18b and the shaft of the motor rotor 21.
In the preferred embodiment of the present invention, the motor rotor 21 is provided with a flexible pad 18d capable of automatic compensation between the thrust plate 18c and the thrust plate holder 18 e.
The friction pair of the supporting bearing of the canned motor pump is made of high-hardness and high-wear-resistance silicon carbide, ceramic or hard alloy materials, a bushing capable of automatically expanding and contracting along with the temperature is arranged between the shaft sleeve and the shaft, and a flexible pad capable of automatically compensating along with the temperature change is also arranged between the thrust plate and the thrust plate support, so that the influence on the shaft sleeve and the bearing due to the temperature change of the conveyed liquid is greatly reduced, and the application range and the reliability of the operation of the canned motor pump are improved.
The utility model discloses in the preferred embodiment, go up the processing coaxial coupling of motor shaft and water pump axle as an organic whole to it is better to the neutrality, operates steadily, the vibration is little, safe and reliable, and the structure is compacter.
In a preferred embodiment of the present invention, the upper bearing 18 may have a first groove, and the first groove may be a straight groove or a spiral groove; the auxiliary bearing 6 may be provided with a second groove, and the second groove may be a straight groove or a spiral groove.
In a preferred embodiment of the present invention, the outer surface and/or the inner surface of the motor rotor 21 may be provided with a spiral channel.
The arrangement of the straight groove or the spiral groove and the spiral channel can more effectively take away more heat generated by the motor.
In the preferred embodiment of the present invention, the high pressure water chamber 25 includes a high pressure water chamber B23, the secondary high pressure water chamber includes a secondary high pressure water chamber B19, and the upper and lower end surfaces of the motor rotor 21 are the secondary high pressure water chamber B19 and the high pressure water chamber B23, respectively, so as to form a pressure difference between the upper and lower ends of the motor rotor; when the water pump is running, the axial force of the pressure difference acting on the rotor is upward, so that the dead weight of a large part of the rotor and the downward axial force generated by the multistage impeller can be offset, the effects of reducing the load of the thrust bearing and reducing the abrasion of the bearing can be achieved, and the service life of the bearing is prolonged.
In a preferred embodiment of the present invention, the multistage canned motor pump further includes: a first-stage impeller suction inlet 3 and a circulating water outlet 28; liquid from the water inlet 2 of the pump can enter the primary impeller 5 through the suction inlet 3 of the primary impeller; in addition, the liquid flowing downward through the circulating water flow passage 16 can flow out of a circulating water outlet 28 of a sub-high pressure stable flow region 27 formed between the guide vane partition plate 26 and the intermediate impeller 7.
The following describes the working process of the multistage shield pump provided by the embodiments of the present invention in detail with reference to the accompanying drawings:
liquid from a water inlet 2 of the pump enters a first-stage impeller 5 through a first-stage impeller suction inlet 3, and the liquid flows into a first-stage guide vane 4 after being pressurized; then flows into a secondary middle impeller 7 and a middle guide vane 8, is pressurized layer by layer, and finally flows through a final-stage impeller 9 and a final-stage guide vane 10 to reach a high-pressure water chamber 25; the majority of the liquid will flow through the outlet passage 30 to the pump outlet 31, except for a small amount of liquid entering the motor interior through the intermediate bearing 24.
A small part of liquid enters a high-pressure water cavity B chamber 23 in the motor from a high-pressure water cavity 25 after lubricating a bearing through a water flow channel of a middle bearing 24, then a part of liquid passes through a sealing gap between a rotor shielding sleeve 15 and a stator shielding sleeve 14, heat of the motor is taken away by heat exchange and then enters a secondary high-pressure water cavity B chamber 19, then the liquid flows into a secondary high-pressure water cavity A chamber 17 after lubricating the bearing through a water flow channel of an upper end bearing 18, and then the liquid flows downwards through a circulating water flow channel 16 in the center of a rotor shaft 22; finally, the circulating water flows out from a circulating water outlet 28 which is positioned between the guide vane partition plate 26 and the middle impeller 7 to form a secondary high-pressure stable area 27.
Because the upper end surface and the lower end surface of the motor rotor 21 are respectively a secondary high-pressure water cavity B chamber 19 and a high-pressure water cavity B chamber 23, the pressure difference between the upper end and the lower end of the motor rotor is formed; when the water pump is running, the axial force of the pressure difference acting on the rotor is upward, so that the dead weight of a large part of the rotor and the downward axial force generated by the multistage impeller can be offset, the effects of reducing the load of the thrust bearing and reducing the abrasion of the bearing can be achieved, and the service life of the bearing is prolonged.
The rotor part is supported by an upper end bearing 18, a middle bearing 24 and a lower auxiliary bearing 6, a bearing friction pair of the upper end bearing 18 and the middle bearing 24 is made of high-hardness and high-wear-resistance silicon carbide, ceramic or hard alloy materials, a bushing 18a capable of automatically expanding and contracting along with temperature is arranged between a shaft sleeve 18b and the rotor shaft 22, and a flexible compensation pad 18d capable of automatically compensating is also arranged between a thrust plate 18c and a thrust plate support 18 e; by the method for installing the part capable of automatically compensating along with the temperature between the ceramic shaft sleeve and the metal body, the high-wear-resistance material can be used on a multistage shield pump, the service life of the pump is greatly prolonged, and the infusion temperature range of the pump is greatly expanded.
A water delivery system comprising a multistage canned motor pump as described in any preceding claim.
To sum up, the embodiment of the utility model provides a multistage canned motor pump and water delivery system mainly has following several advantages:
firstly, the pressure difference of the cooling circulating water inlet and the cooling circulating water outlet of the motor is very small, and the pressure loss caused to the outlet of the water pump is very small;
secondly, upward pressure formed by the upper end surface and the lower end surface of the rotor can offset part of originally generated downward axial force, so that the load of the bearing is reduced, and the service life of the bearing is prolonged;
and the bearing is made of high-hardness and high-wear-resistance silicon carbide, ceramic or hard alloy materials, and a part capable of automatically compensating along with temperature is arranged between the ceramic shaft sleeve and the metal body, so that the high-wear-resistance materials can be used on the multistage shield pump, the service life of the pump is greatly prolonged, and the infusion temperature range of the pump is greatly expanded.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A multi-stage canned motor pump comprising: the water inlet and outlet base is provided with a pump water inlet and a pump water outlet, the water inlet and outlet base is connected with a first-stage impeller, and a middle impeller and a last-stage impeller are sequentially accumulated above the first-stage impeller; a first-stage guide vane is arranged outside the first-stage impeller, a middle guide vane is arranged outside the middle impeller, and a last-stage guide vane is arranged outside the last-stage impeller;
a water outlet channel is formed between the first-stage guide vane, the middle guide vane and the last-stage guide vane and the pressure-resistant cylinder, a motor base, a motor stator and a stator shielding sleeve are connected above the water outlet channel through a pump cover, a rotor shaft, a motor rotor and a rotor shielding sleeve are mounted in the middle of the motor stator, and a sealing gap between a main water cavity and a secondary water cavity is formed between the rotor shielding sleeve and the stator shielding sleeve; a multistage impeller is arranged in the lower end area of the rotor shaft, and a circulating water flow channel is arranged in the center of the motor rotor;
the cavity at the lower end of the motor rotor is connected with the water outlet channel at the water outlet position of the final-stage impeller through an inner ring flow channel of the middle bearing to form the main water chamber; and the cavity at the upper end of the motor rotor is connected with a flow stabilizing area formed between the last-stage impeller and the next-stage impeller and a guide vane partition plate through a flow channel of an upper-end bearing and the circulating water flow channel at the center of the motor rotor so as to form the secondary water chamber.
2. The multi-stage canned motor pump of claim 1, wherein the motor rotor is wrapped by the rotor can and secured to the rotor shaft;
the motor stator is wrapped by the stator shielding sleeve and is fixed in the motor base.
3. The multistage canned pump of claim 1 or 2, wherein the motor rotor, the rotor can and the motor stator and the stator can are all arranged coaxially with a motor shaft;
the rotor shield cover with form between the stator shield cover the seal clearance of primary water cavity with the secondary water cavity, just the seal clearance is 0.05 ~ 1.0 mm.
4. The multi-stage canned motor pump of claim 1, wherein the motor rotor is supported by the upper end bearing, the intermediate bearing, and a lower auxiliary bearing.
5. The multi-stage canned motor pump of claim 4, wherein the shaft sleeve and shaft of the motor rotor are fitted with a bushing therebetween.
6. The multi-stage canned motor pump of claim 4 or 5, wherein the motor rotor is equipped with a self-compensating flexible pad between the thrust plate and the thrust plate holder.
7. The multi-stage canned motor pump of claim 1, wherein the motor shaft and the water pump shaft are integrally formed and coaxially connected.
8. The multi-stage canned motor pump of claim 4, wherein the upper end bearing is provided with a first groove, and the first groove is a straight groove or a spiral groove;
the auxiliary bearing is provided with a second groove, and the second groove is a straight groove or a spiral groove.
9. The multi-stage canned motor pump of claim 1 or 8, wherein the outer and/or inner surface of the motor rotor is provided with a helical channel.
10. A water delivery system, comprising: a multi-stage canned motor pump as claimed in any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920705791.6U CN209856040U (en) | 2019-05-16 | 2019-05-16 | Multistage canned motor pump and use its water delivery system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920705791.6U CN209856040U (en) | 2019-05-16 | 2019-05-16 | Multistage canned motor pump and use its water delivery system |
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| CN209856040U true CN209856040U (en) | 2019-12-27 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110030193A (en) * | 2019-05-16 | 2019-07-19 | 上海创科泵业制造有限公司 | Multi-stage shield pump and the water-carriage system for applying it |
| CN111810411A (en) * | 2020-08-10 | 2020-10-23 | 大连海密梯克泵业有限公司 | Multistage shielding pump with balance disc structure |
| CN117823415A (en) * | 2024-03-04 | 2024-04-05 | 山东华立供水设备有限公司 | Multistage centrifugal pump |
-
2019
- 2019-05-16 CN CN201920705791.6U patent/CN209856040U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110030193A (en) * | 2019-05-16 | 2019-07-19 | 上海创科泵业制造有限公司 | Multi-stage shield pump and the water-carriage system for applying it |
| CN111810411A (en) * | 2020-08-10 | 2020-10-23 | 大连海密梯克泵业有限公司 | Multistage shielding pump with balance disc structure |
| CN117823415A (en) * | 2024-03-04 | 2024-04-05 | 山东华立供水设备有限公司 | Multistage centrifugal pump |
| CN117823415B (en) * | 2024-03-04 | 2024-05-03 | 山东华立供水设备有限公司 | Multistage centrifugal pump |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220214 Address after: 200000 Building 2, No. 777, Songhui Road, Qingpu District, Shanghai Patentee after: LANCO pump (Shanghai) Co.,Ltd. Address before: No.777, Songhui Road, Zhaoxiang Town, Qingpu District, Shanghai, 201700 Patentee before: SHANGHAI CHUANGKE PUMP MANUFACTURING CO.,LTD. |