CN221170016U

CN221170016U - Multistage shielding pump

Info

Publication number: CN221170016U
Application number: CN202323061101.3U
Authority: CN
Inventors: 潘晓晖; 贾博雅; 宋颜青; 孟祥浩; 张启良
Original assignee: Lanco Pump Shanghai Co ltd
Current assignee: Lanco Pump Shanghai Co ltd
Priority date: 2023-11-13
Filing date: 2023-11-13
Publication date: 2024-06-18
Anticipated expiration: 2033-11-13

Abstract

The application provides a multistage canned motor pump, which comprises a water inlet shell, a water outlet shell, a multistage impeller, a plurality of guide vanes and a motor assembly, wherein the water inlet shell is provided with a water inlet hole; the water inlet shell and the water outlet shell are arranged at intervals, and the multi-stage impeller and the plurality of guide vanes are arranged between the water inlet shell and the water outlet shell; the motor assembly is arranged on the water outlet shell, a rotor shaft of the motor assembly penetrates through the water outlet shell and stretches into a pressurizing cavity defined by the water inlet shell and the water outlet shell, and the multistage impellers are arranged on the rotor shaft. The multistage shielding pump adopts a multistage impeller structure, can better enhance the lift of the multistage shielding pump, and has the advantages of compact structure, high lift, small volume, small vibration, low noise and the like.

Description

Multistage shielding pump

Technical Field

The utility model relates to the field of centrifugal pumps, in particular to a multistage canned motor pump.

Background

The multistage canned motor pump is one of centrifugal pumps, is a leak-free and maintenance-free pump, and has many advantages, such as silence, no pulsation, and operation under conditions of high temperature, high pressure, high viscosity, etc. The multistage canned motor pump can greatly reduce the operation noise of the pump, so that the multistage canned motor pump is widely applied to places requiring silence, such as hospitals, laboratories, large offices and the like; where the requirements on pump system pulsations are low; where high temperature or high viscosity liquids are to be delivered.

The inventor researches find that the existing multistage canned motor pump has at least the following disadvantages:

1. The existing horizontal multistage shielding pump mainly adopts a single impeller volute, and the required flow lift is achieved by increasing the impeller size, but the whole volume is increased due to the increase of the impeller size;

2. The existing horizontal multistage shielding pump is large in size, inconvenient to install and needs to occupy a large space. The greater the volume of the pump, the more likely it is to produce greater vibrations, and the greater the requirements for support and vibration suppression of the pump.

Disclosure of utility model

The utility model aims to provide a multistage shielding pump which adopts a multistage impeller structure, can better enhance the lift of the multistage shielding pump and has the advantages of compact structure, high lift, small volume, small vibration, low noise and the like.

Embodiments of the present utility model are implemented as follows:

the present utility model provides a multistage canned motor pump comprising:

The device comprises a water inlet shell, a water outlet shell, a multi-stage impeller, a plurality of guide vanes and a motor assembly; the water inlet shell and the water outlet shell are arranged at intervals, and the multistage impeller and the guide vanes are arranged between the water inlet shell and the water outlet shell; the motor assembly is installed in the water outlet shell, a rotor shaft of the motor assembly penetrates through the water outlet shell and stretches into a pressurizing cavity defined by the water inlet shell and the water outlet shell, and the multistage impellers are all installed on the rotor shaft.

In an alternative embodiment, the water inlet shell is provided with an exhaust hole and a liquid discharge hole, and the exhaust hole is positioned above the liquid discharge hole.

Based on above-mentioned scheme, when multistage canned motor pump stopped the operation, can open exhaust hole and flowing back hole, make inside gas follow exhaust hole exhaust, make remaining liquid follow flowing back hole exhaust, realize quick effectual unloading exhaust, do benefit to multistage canned motor pump accomodate and preserve.

In an alternative embodiment, the multistage impeller is fixedly connected with the rotor shaft by a spline, so that the impeller and the rotor shaft are relatively fixed in the circumferential direction of the rotor shaft.

Based on the scheme, the impeller and spline connection structure is simple, the assembly is convenient, the assembly efficiency is improved, the stability and reliability in the operation process are improved, and the service life of the multistage shielding pump is prolonged.

In an alternative embodiment, the rotor shaft is sleeved with a shaft sleeve, and adjacent impellers are limited through the shaft sleeve, so that the impellers and the rotor shaft are relatively fixed in the axial direction of the rotor shaft.

Based on the scheme, through the design of the shaft sleeve, the distance between adjacent impellers can be kept unchanged, the adjacent impellers cannot interfere with each other to influence, and the multistage canned motor pump is stable and reliable in operation.

In an alternative embodiment, a lock nut is screwed to the end of the rotor shaft located in the pressurizing cavity, and a gasket is arranged between the lock nut and the shaft sleeve.

Based on above-mentioned scheme, be convenient for axle sleeve and impeller location on the rotor shaft through lock nut, that is to say, after impeller and axle sleeve assembly, axle sleeve and impeller all have the trend of moving in the axial of rotor shaft for the rotor shaft together, so, set up the step on the rotor shaft earlier, after axle sleeve and impeller cup joint outside the rotor shaft, utilize lock nut spiro union at the tip of rotor shaft, make lock nut with axle sleeve and impeller butt step on, so, realized the axial positioning of axle sleeve and impeller.

In an alternative embodiment, the motor assembly comprises a motor casing, a first bearing, a second bearing, a bearing seat, a stator group and a rotor group, wherein the motor casing is connected with the water outlet casing; the bearing seat and the first bearing are both arranged on the motor shell, the bearing seat is positioned on one side of the first bearing, which is close to the water outlet shell, the second bearing is arranged on the bearing seat, and the rotor shaft is simultaneously arranged in the first bearing and the second bearing in a penetrating way; the stator group and the rotor group are both arranged in the motor casing; and a water return hole is formed in the position, corresponding to the first bearing, of the motor shell.

Based on above-mentioned scheme, in the operation process of motor assembly, its inside can produce the heat, in order to guarantee motor assembly's operational stability, need in time dispel the heat. The internal circulation heat dissipation of the motor assembly can be realized through the structural design. Specifically, after the liquid passes through the multistage impeller to do work, the liquid enters the water outlet shell, the area belongs to a high-pressure area, a small amount of liquid can pass through the hole of the bearing seat and the gap between the second bearing and the rotor shaft, and the liquid can also lubricate the bearing. Then, the liquid enters the stator group, the liquid flows through the gap between the shielding sleeve of the stator group and the shielding sleeve of the rotor group, the heat of the coil of the stator group is taken away, the heat passes through the gap between the first bearing and the rotor shaft, the heat reaches the tail end of the rotor shaft, a low-pressure area is formed here, the liquid returns to the inlet of the multistage shielding pump through the water return hole, and a new cycle is started.

In an alternative embodiment, a water through hole for guiding fluid to the water return hole is arranged on the rotor shaft.

Based on the scheme, liquid can enter the backwater hole from the water through hole, flow more smoothly, and the heat is taken away through liquid conveniently.

In an alternative embodiment, the multistage canned motor pump further comprises a base, and the water outlet housing is mounted to the base.

Based on the scheme, through the structural design of base, the multistage canned motor pump's of being convenient for installation.

In an alternative embodiment, the water outlet housing is welded or screwed to the base.

Based on the scheme, the water outlet shell and the base are simple in installation mode and high in assembly efficiency.

In an optional embodiment, the multistage canned motor pump further comprises an outlet box and a box cover, wherein the outlet box is mounted on the motor assembly, the box cover is detachably connected with the outlet box and jointly defines a cavity, a plurality of outlet holes are formed in the outlet box, and outlet directions of at least two outlet holes in the plurality of outlet holes are different.

Based on the scheme, through the structural design of a plurality of wire outlet holes, corresponding wire outlet hole wiring can be selected according to the situation, the operation is flexible, the application range is wide, and wiring is facilitated.

The embodiment of the utility model has the beneficial effects that:

In summary, in operation, the motor assembly is started to drive the rotor shaft to rotate, the rotor shaft is provided with the multistage impellers arranged at intervals in the axial direction of the rotor shaft, liquid is sucked into the first-stage impeller close to the water inlet of the water inlet shell under the rotation action of the impeller and pushed out from the periphery of the impeller, strong pressure is generated, the liquid enters the guide vane corresponding to the impeller, is continuously sucked into the impeller of the next stage, is subjected to multistage boosting, and finally passes through the centrifugal cavity and is discharged out of the pump body. Therefore, the multistage shielding pump can achieve corresponding flow lift by increasing the number of impeller stages without replacing the whole pump or greatly changing the structure, so that the pump has flexibility and adjustability to a certain extent. Meanwhile, the multistage shielding pump is compact in overall structure and small in size, so that the mass and gravity center of the multistage shielding pump are distributed more uniformly, vibration is smaller, and noise is low.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic cross-sectional view of a multistage canned motor pump according to an embodiment of the present utility model;

Fig. 2 is a schematic structural diagram of a multistage canned motor pump according to an embodiment of the present utility model.

Icon:

100-a water inlet shell; 101-an exhaust hole; 102-a liquid discharge hole; 103-water inlet holes; 200-a water outlet shell; 201-a water outlet hole; 300-impeller; 400-guide vanes; 500-motor assembly; 510-a motor housing; 511-a return water hole; 520-a first bearing; 530-a second bearing; 540-bearing seat; 550-stator group; 560-rotor set; 570-rotor shaft; 571-water holes; 580-sleeve; 590-lock nut; 591-a gasket; 600-screw; 700-screw; 800-a base; 900-an outlet box; 910-lid; 920-cable connector.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model 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 utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its 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 utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the prior art, the multistage canned motor pump mainly adopts a single impeller 300 volute, and the required flow lift is achieved by increasing the size of the impeller 300, but the increase of the size of the impeller 300 can increase the whole volume. Because of the large volume, the installation is inconvenient, and the large space is required. The greater the volume of the pump, the more likely it is to produce greater vibrations, and the greater the requirements for support and vibration suppression of the pump.

In view of this, the designer provides a multistage canned motor pump that can be fast adjust impeller 300 progression to reach required flow head, and the overall compact structure makes the volume less, weight is lower simultaneously, can be to adapting to more places. Is suitable for the industrial and civil fields.

Referring to fig. 1-2, in the present embodiment, the multistage canned motor pump includes a water inlet casing 100, a water outlet casing 200, a multistage impeller 300, a plurality of guide vanes 400, and a motor assembly 500; the water inlet shell 100 and the water outlet shell 200 are arranged at intervals, and the multi-stage impeller 300 and the plurality of guide vanes 400 are arranged between the water inlet shell 100 and the water outlet shell 200; the motor assembly 500 is mounted to the water outlet housing 200, and a rotor shaft 570 of the motor assembly 500 penetrates the water outlet housing 200 and extends into a pressurized cavity defined by the water inlet housing 100 and the water outlet housing 200, and the multistage impellers 300 are mounted to the rotor shaft 570.

In view of the above, the working principle of the multistage canned motor pump provided in this embodiment is as follows:

In operation, the motor assembly 500 is started, the rotor shaft 570 rotates, the multi-stage impeller 300 mounted on the rotor shaft 570 rotates together, liquid is sucked into the first-stage impeller 300 close to the water inlet 103 of the water inlet housing 100 under the rotation of the impeller 300, and is pushed out from the periphery of the impeller 300, so that strong pressure is generated, the liquid enters the guide vane 400 corresponding to the impeller 300, continues to be sucked into the impeller 300 of the next stage, is subjected to multi-stage pressure boosting, and finally passes through the centrifugal cavity and is discharged out of the pump body. Therefore, the multistage shielding pump can achieve corresponding flow lift by increasing the number of stages of the impeller 300 without replacing the whole pump or greatly changing the structure, so that the pump has flexibility and adjustability to a certain extent. Meanwhile, the multistage shielding pump is compact in overall structure and small in size, so that the mass and gravity center of the multistage shielding pump are distributed more uniformly, vibration is smaller, and noise is low.

The following examples illustrate the detailed structure of the multistage canned motor pump of the present application by way of example.

In this embodiment, alternatively, the water inlet housing 100 and the water outlet housing 200 are fixedly connected by a screw 600. For example, the water inlet casing 100 is provided with the first lug around, the first lug is provided with the first mounting hole, the water outlet casing 200 is provided with the second lug around, the second lug is provided with the second mounting hole, the number of the first lug and the second lug is a plurality of, and the screw 600 passes through the first mounting hole and then is in threaded connection with the second mounting hole, so that the water inlet casing 100 and the water outlet casing 200 are connected through the plurality of screws 600, and a plurality of guide vanes 400 between the water inlet casing 100 and the water outlet casing 200 can be compressed, so that gaps between adjacent guide vanes 400 are reduced, and the tightness is improved.

Further, the water inlet housing 100 is provided with an air outlet 101 and a liquid outlet 102, and the air outlet 101 is located above the liquid outlet 102, for example, in normal operation, the air outlet 101 is located right above the liquid outlet 102. When the multistage canned motor pump stops running, can open exhaust hole 101 and flowing back hole 102, make inside gas discharge from exhaust hole 101, make remaining liquid discharge from flowing back hole 102, realize quick effectual unloading and exhaust, do benefit to multistage canned motor pump's accomodate and preserve. It should be understood that valves may be provided at the vent hole 101 and the drain hole 102, respectively, and the valves may be mechanical valves or plugs, etc.

In addition, the water inlet housing 100 is provided with a water inlet 103 at an axial end thereof, the water outlet housing 200 is provided with a water outlet 201 at a top thereof, and most of the liquid is discharged from the water outlet 201 after the liquid is pressurized.

In this embodiment, optionally, motor assembly 500 includes motor housing 510, first bearing 520, second bearing 530, bearing housing 540, stator assembly 550, and rotor assembly 560. The motor case 510 is fixedly connected with the water outlet case 200 by the screw 700. The bearing seat 540 and the first bearing 520 are both installed on the motor housing 510, and the bearing seat 540 is located at one side of the first bearing 520 close to the water outlet housing 200, the second bearing 530 is installed on the bearing seat 540, and the rotor shaft 570 is simultaneously inserted into the first bearing 520 and the second bearing 530. Stator set 550 and rotor set 560 are both mounted within motor housing 510; the motor housing 510 is provided with a water return hole 511 at a position corresponding to the first bearing 520. The rotor shaft 570 is fixed to the rotor group 560, and a water passage hole 571 is provided in a position of the rotor shaft 570 near the first bearing 520. After the liquid passes through the multistage impeller 300 to perform work, the liquid enters the inside of the water outlet housing 200, the area belongs to a high pressure area, and a small amount of the liquid can pass through the holes of the bearing seat 540 and the gap between the second bearing 530 and the rotor shaft 570, and can pass through the liquid and lubricate the bearing. Subsequently, the liquid enters the inside of the stator set 550, flows through the gap between the shielding sleeve of the stator set 550 and the shielding sleeve of the rotor set 560, takes away the heat of the coil of the stator set 550, passes through the gap between the first bearing 520 and the rotor shaft 570, reaches the end of the rotor shaft 570, is discharged from the water through hole 571, which is a low pressure area, returns to the inlet of the multistage shielding pump through the water return hole 511, and starts a new cycle. In this process, the liquid passes through the stator set 550 and the rotor set 560 to remove heat, thereby realizing internal circulation cooling.

It should be appreciated that the water outlet housing 200 and the motor housing 510 may be fixedly coupled by a plurality of screws 700, improving structural stability.

It should be noted that the number of impellers 300 may be three, the number of vanes 400 may be two, and in the direction from the water inlet housing 100 to the water outlet housing 200, there may be a first-stage impeller 300, a second-stage impeller 300, and a final-stage impeller 300, respectively, and the two vanes 400 correspond to the first-stage impeller 300 and the second-stage impeller 300, respectively, and the final-stage impeller 300 directly introduces the liquid into the water outlet housing 200, and thus the vanes 400 are not provided. It should be appreciated that in other embodiments, the number of impellers 300 is not limited to three.

Meanwhile, the impeller 300 is fixedly coupled with the rotor shaft 570 through a spline such that the impeller 300 and the rotor shaft 570 are relatively fixed in the circumferential direction of the rotor shaft 570. The rotor shaft 570 is further sleeved with a shaft sleeve 580, and the adjacent impellers 300 are limited by the shaft sleeve 580, so that the impellers 300 and the rotor shaft 570 are relatively fixed in the axial direction of the rotor shaft 570. In addition, a step is provided on the peripheral surface of the rotor shaft 570, and when the rotor shaft 570 is assembled, the shaft sleeve 580 and the impeller 300 are sleeved outside the rotor shaft 570, and then are screwed at the end part of the rotor shaft 570 by using the lock nut 590, so that the lock nut 590 and the gasket 591 are matched to abut the shaft sleeve 580 and the impeller 300 on the step, and the axial positioning of the shaft sleeve 580 and the impeller 300 is realized.

In this embodiment, optionally, the multistage canned motor pump further includes a base 800, and the water outlet housing 200 is mounted on the base 800. For example, the water outlet housing 200 is welded or screwed with the base 800. The threaded connection may include that the water outlet housing 200 is screwed and fixed to the base 800 by a structural member such as a bolt.

In this embodiment, optionally, the multistage canned motor pump further includes an outlet box 900, a box cover 910 and a cable connector 920, where the outlet box 900 is mounted on the motor assembly 500, the box cover 910 is detachably connected with the outlet box 900 and defines a cavity together, and a plurality of outlet holes are disposed on the outlet box 900, and outlet directions of at least two outlet holes in the plurality of outlet holes are different. Through the structural design of the plurality of wire outlets, the corresponding wire outlet cable connector 920 can be selected to be penetrated according to the situation, the operation is flexible, the application range is wide, and the wiring is facilitated. In addition, when some wire outlet holes are not used, plugs can be arranged at the wire outlet holes, so that water inlet or dust inlet is avoided. For example, in this embodiment, two wire outlets are disposed opposite to each other.

The multistage canned motor pump that this embodiment provided, the flow lift that can be required is reached in the adjustment impeller 300 progression that can be quick, and whole compact structure makes the volume littleer, weight lower simultaneously, can be to adapting to more places.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A multi-stage canned motor pump, comprising:

2. The multi-stage canned motor pump of claim 1, wherein:

the water inlet shell is provided with an exhaust hole and a liquid discharge hole, and the exhaust hole is positioned above the liquid discharge hole.

3. The multi-stage canned motor pump of claim 1, wherein:

The multistage impeller is fixedly connected with the rotor shaft through a spline, so that the impeller and the rotor shaft are relatively fixed in the circumferential direction of the rotor shaft.

4. The multi-stage canned motor pump of claim 1, wherein:

the rotor shaft is sleeved with a shaft sleeve, and adjacent impellers are limited through the shaft sleeve, so that the impellers and the rotor shaft are relatively fixed in the axial direction of the rotor shaft.

5. The multi-stage canned motor pump of claim 4, wherein:

the end of the rotor shaft, which is positioned in the pressurizing cavity, is in threaded connection with a lock nut, and a gasket is arranged between the lock nut and the shaft sleeve.

6. The multistage canned motor pump according to any one of claims 1-5, wherein:

The motor assembly comprises a motor shell, a first bearing, a second bearing, a bearing seat, a stator group and a rotor group, wherein the motor shell is connected with the water outlet shell; the bearing seat and the first bearing are both arranged on the motor shell, the bearing seat is positioned on one side of the first bearing, which is close to the water outlet shell, the second bearing is arranged on the bearing seat, and the rotor shaft is simultaneously arranged in the first bearing and the second bearing in a penetrating way; the stator group and the rotor group are both arranged in the motor casing; and a water return hole is formed in the position, corresponding to the first bearing, of the motor shell.

7. The multi-stage canned motor pump according to claim 6, wherein:

the rotor shaft is provided with a water through hole for guiding fluid to the water return hole.

8. The multi-stage canned motor pump of claim 1, wherein:

The multistage canned motor pump still includes the base, go out water casing install in the base.

9. The multi-stage canned motor pump of claim 8, wherein:

the water outlet shell is welded or in threaded connection with the base.

10. The multi-stage canned motor pump of claim 1, wherein:

The multistage canned motor pump further comprises an outlet box and a box cover, wherein the outlet box is arranged on the motor assembly, the box cover is detachably connected with the outlet box and jointly defines a cavity, a plurality of outlet holes are formed in the outlet box, and the outlet directions of at least two outlet holes in the plurality of outlet holes are different.