CN212376881U

CN212376881U - Centrifugal pump with adjustable impeller diameter

Info

Publication number: CN212376881U
Application number: CN202020855508.0U
Authority: CN
Inventors: 章嘉晶; 张兰春
Original assignee: Jiangsu University of Technology
Current assignee: Jiangsu University of Technology
Priority date: 2020-05-21
Filing date: 2020-05-21
Publication date: 2021-01-19
Anticipated expiration: 2030-05-21

Abstract

The utility model belongs to the technical field of the centrifugal pump, a impeller diameter adjustable centrifugal pump is related to, including the pump case, set up the impeller in the pump case to and can drive impeller pivoted motor, still be equipped with the tight subassembly that rises that can reciprocate in the pump case, be equipped with on the impeller and rise tight groove that rises of tight subassembly assorted, through the reciprocating of the tight subassembly that rises can realize the extrusion or relax the impeller to can realize the regulation to impeller diameter, both sides are equipped with motor and pneumatic cylinder respectively about the pump case, the output shaft of motor run through to the pump case inside in proper order with rising tight stopper and impeller fixed connection, the piston rod of pneumatic cylinder run through to the pump case inside with lower rising tight stopper rotatable coupling. The utility model changes the flow of the centrifugal pump by changing the diameter of the impeller, can increase the specification of the centrifugal pump, and is matched with different systems; meanwhile, the front guide vane is additionally arranged for pre-rotation adjustment, so that the flow loss and the impact loss of the impeller inlet of the centrifugal pump can be reduced, and the hydraulic performance of the centrifugal pump is improved.

Description

Centrifugal pump with adjustable impeller diameter

Technical Field

The utility model belongs to the technical field of the centrifugal pump, concretely relates to impeller diameter adjustable centrifugal pump.

Background

The pump is a machine for converting the mechanical energy of a prime motor into the energy of pumped liquid, has various types and wide application range, and plays an important role in various departments of national economy. Among various types of pumps, the number of centrifugal pumps accounts for more than 75%, and the centrifugal pumps are widely applied to the fields of electric power, petrifaction, water conservancy, aerospace and the like. In order to save energy and improve economy, the performance requirements of the pump are higher and higher, and the user is too conservative in the selection process of the pump in order to ensure that the pump can meet all working conditions, and the capacity of the selected pump is too large for the system. In order to ensure that the pump can sufficiently meet the requirements of the system, the cost increased by selecting an oversize pump is generally ignored, and only the capacity of the pump is considered to be increased to ensure the safety requirement of the operation of the system. This approach results in higher system operation and maintenance costs. Furthermore, under inefficient operating conditions, pump sizing is typically too large and requires more frequent maintenance than pumps whose flow and head are matched to the system. Excessive flow energy increases wear and damage to system components, resulting in valve damage, increased piping system pressure, and noise problems. In order to better match the requirements of different systems, the centrifugal pump is required to change the flow and adjust the working condition. The commonly used adjustment methods for the flow rate of the centrifugal pump include variable speed adjustment (changing the rotating speed of the water pump), variable diameter adjustment (cutting an impeller), variable angle adjustment (changing the installation angle of a blade), and the like, and the adjustment methods all need to disassemble the centrifugal pump and replace corresponding parts. The steps of disassembly, inspection and installation of the centrifugal pump are complex, and a large amount of resources are consumed in actual production application.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the more complicated problem of centrifugal pump flow control mode that has now, the centrifugal pump of impeller diameter adjustable of design can realize the regulation of centrifugal pump flow through the regulation of impeller diameter.

In order to achieve the above object, the utility model adopts the following technical scheme: the utility model provides an impeller diameter adjustable centrifugal pump, includes the pump case, sets up the impeller in the pump case to and can drive impeller pivoted motor, still be equipped with the tight subassembly that rises that can reciprocate in the pump case, be equipped with on the impeller with rise tight subassembly assorted and rise the tight groove, through rise the reciprocating of tight subassembly and can realize the extrusion or relax the impeller to can realize the regulation to the impeller diameter.

Preferably, the upper side and the lower side of the pump shell are respectively provided with a motor and a hydraulic cylinder, an output shaft of the motor penetrates into the pump shell and is fixedly connected with the upper expansion plug and the impeller in sequence, and a piston rod of the hydraulic cylinder penetrates into the pump shell and is rotatably connected with the lower expansion plug.

Preferably, the impeller comprises a front cover plate, blades and a rear cover plate which are sequentially connected, a lower expansion groove matched with the lower expansion plug is formed in the front cover plate, and an upper expansion groove matched with the upper expansion plug is formed in the rear cover plate.

Preferably, the upper tensioning plug is fixedly connected in the upper tensioning groove, the lower tensioning plug is movably connected in the lower tensioning groove, and the upper tensioning plug and the lower tensioning plug are both in a trapezoidal round platform structure and are symmetrically arranged with each other.

Preferably, the middle part of the lower expansion plug is provided with a mounting hole matched with the piston rod, and the mounting hole is rotatably connected with the piston rod through a rolling bearing.

Preferably, an annular water inlet channel with the diameter consistent with that of the water inlet of the impeller penetrates through the lower tensioning plug, a front guide vane is arranged at the bottom of the water inlet channel, and a support steel bar is arranged on the front guide vane.

Preferably, the motor is installed above the pump shell through a connecting piece, the hydraulic cylinder is installed at the bottom of the pump shell through an end cover, and the left side and the right side of the pump shell are respectively provided with a water inlet flange and a water outlet flange.

Preferably, the impeller is a closed impeller, and the impeller is made of stretchable high polymer material.

After the technical scheme is adopted, the utility model provides a pair of impeller diameter adjustable centrifugal pump has following beneficial effect:

(1) the utility model discloses utilize the stretchability of the impeller of macromolecular material preparation, through the tight subassembly that rises that can reciprocate to the extrusion of impeller or relax, realize the change to the impeller diameter, the change of impeller diameter and then changed the end speed of impeller, change the energy in the middle of transmitting the system fluid from this to change produced flow and the pressure of centrifugal pump.

(2) The utility model discloses a change the flow and the lift and the system matching of impeller diameter messenger centrifugal pump, raise the efficiency when guaranteeing system operation safety, avoid wearing and tearing and noise problem that too big mobile energy caused.

(3) The utility model discloses packing into the tight stopper that rises down at the impeller water inlet, the tight stopper inlet channel bottom that rises down installs leading stator additional and carries out the regulation of prewhirling, and the prewhirling through leading stator is adjusted and can be changed centrifugal pump characteristic curve's shape and the hydraulic performance who improves the centrifugal pump.

Drawings

Fig. 1 is a schematic structural view of a centrifugal pump with an adjustable impeller diameter according to the present invention;

FIG. 2 is a sectional view of a centrifugal pump with an adjustable impeller diameter according to the present invention;

FIG. 3 is a partial enlarged view of the connection between the middle and lower expanding plugs and the piston rod of the present invention;

FIG. 4 is a perspective view of the middle impeller, the upper expansion plug and the lower expansion plug of the present invention;

fig. 5 is a schematic structural view of an impeller according to the present invention;

fig. 6 is a schematic view of a blade structure of an impeller according to the present invention;

fig. 7 is a schematic structural view of the middle and lower expansion plug of the present invention.

Wherein: the pump casing 1, impeller 2, motor 3, pneumatic cylinder 4, output shaft 5, rising stop cock 6, piston rod 7, rising stop cock 8 down, front shroud 9, blade 10, back shroud 11, mounting hole 12, antifriction bearing 13, water inlet 14, inlet channel 15, leading stator 16, support billet 17, connecting piece 18, end cover 19, water inlet flange 20, delivery port flange 21.

Detailed Description

The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. 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 is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. 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, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.

The utility model relates to an impeller diameter adjustable centrifugal pump, as shown in fig. 1-7, including pump case 1, set up impeller 2 in pump case 1 to and can drive impeller 2 pivoted motor 3, still be equipped with the tight subassembly that rises that can reciprocate in the pump case 1, be equipped with on impeller 2 with the tight groove that rises of tight subassembly assorted that rises, through the reciprocating of the tight subassembly that rises can realize the extrusion or relax impeller 2 to can realize the regulation to impeller 2 diameter.

The left side and the right side of the pump shell 1 are respectively provided with a water inlet flange 20 and a water outlet flange 21, and liquid enters the interior of the pump shell 1 from the water inlet flange 20 and is discharged from the water outlet flange 21 after being centrifuged by the impeller 2.

Impeller 2 chooses closed impeller for use, impeller 2 material chooses tensile macromolecular material for use, specifically includes front shroud 9, blade 10 and the back shroud 11 that connects gradually from lower to upper, utilizes impeller 2's stretchability, can realize the change to impeller 2 diameter through the extrusion to impeller 2.

The motor 3 is installed above the pump shell 1 through a connecting piece 18, an output shaft 5 of the motor 3 penetrates into the pump shell 1 and is fixedly connected with the rising tight plug 6 and a rear cover plate 11 of the impeller 2 in sequence, a rising tight groove matched with the rising tight plug 6 is formed in the rear cover plate 11, the rising tight plug 6 is fixedly connected in the rising tight groove, and fixing holes matched with the output shaft 5 are formed in the rising tight plug 6 and the rear cover plate 11.

The hydraulic cylinder 4 is installed at the bottom of the pump shell 1 through an end cover 19, a piston rod 7 of the hydraulic cylinder 4 penetrates into the pump shell 1 and is rotatably connected with a lower tensioning plug 8, the lower tensioning plug 8 can be driven to ascend or descend through the extension and contraction of the piston rod 7, a lower tensioning groove matched with the lower tensioning plug 8 is formed in the front cover plate 9, the lower tensioning plug 8 is movably connected in the lower tensioning groove, the lower tensioning plug 8 can be tightly pressed in the lower tensioning groove or separated from the lower tensioning groove through the ascending or descending of the lower tensioning plug 8, specifically, an installation hole 12 matched with the piston rod 7 is formed in the middle of the lower tensioning plug 8, the installation hole 12 is rotatably connected with the piston rod 7 through a rolling bearing 13, an annular water inlet channel 15 with the diameter consistent with that of a water inlet 14 of the impeller 2 penetrates through the lower tensioning plug 8, the water inlet 14 is arranged on the front cover plate 9 of the impeller 2, and a front guide vane 16 is arranged at the bottom of the water inlet channel, the liquid can be pre-screwed to improve the hydraulic performance of the centrifugal pump, and the front guide vane 16 is provided with a support steel bar 17 for supporting the front guide vane 16 and transferring the torque from the piston rod 7 to enable the lower tensioning plug 8 to ascend or descend.

Further, the rising and tightening plugs 6 and the falling and tightening plugs 8 are both in a trapezoidal circular truncated cone structure and are symmetrically arranged with each other, and one end close to the impeller 2 is the end with a small diameter.

The utility model relates to a centrifugal pump during operation of impeller diameter adjustable, according to required flow and lift of system matching, pneumatic cylinder 4 rises or descends and makes the tight stopper 8 that rises down extrude, relax the diameter that changes impeller 2 to impeller 2, changes the flow and the pressure of centrifugal pump.

In the initial state, the rising-up plug 6 is embedded into the rising-up groove with the same radian as the rising-up plug 6 on the outer surface of the back cover plate 11 of the impeller 2 and is fixedly connected with the output shaft 5, the position is fixed, when the flow needs to be increased, the hydraulic cylinder 4 increases the oil pressure, the piston rod 7 rises, the rising-down plug 8 is under the action of the piston rod 7, and the support steel bar 17 on the rising-down plug 8 transmits the torque of the piston rod 7 to drive the rising-down plug 8 to be embedded into the rising-down groove with the same radian as the rising-down plug 8 on the outer surface of the front cover plate 9 of the impeller 2 (because the rising-down plug 8 is embedded into the groove of the impeller 2 and the rising-down plug 8 is connected with the piston rod 7 through the rolling bearing 13, the rotation of the impeller 2 drives the rising-down plug 8 to rotate with the rolling bearing 13, and the piston rod 7 does not rotate), because the back cover plate 11, the diameter of the impeller 2 is enlarged by utilizing the better stretchability of the high polymer material, so that the end speed of the impeller 2 is increased, the energy transmitted to a system fluid medium is improved, and the flow and the pressure generated by the centrifugal pump are increased; meanwhile, the front guide vane 16 is arranged at the lower expansion plug 8 for pre-rotation adjustment, so that the flow loss and the impact loss of the inlet of the water pump impeller 2 can be reduced, and the hydraulic performance of the centrifugal pump is improved.

When the flow needs to be reduced, the piston rod 7 of the hydraulic cylinder 4 descends to drive the lower expansion tight plug 8 to move downwards, the pressure of the lower expansion tight plug 8 on the impeller 2 is reduced, the impeller 2 slowly rebounds and contracts, the diameter of the impeller 2 is reduced, the end speed of the impeller 2 is reduced, and the flow and the pressure generated by the centrifugal pump are reduced.

In summary, the centrifugal pump with the adjustable impeller diameter provided by the utility model has the advantages of simple structure and strong practicability, and the specification of the centrifugal pump can be increased by changing the flow of the centrifugal pump by changing the diameter of the impeller, so as to match different systems; meanwhile, the front guide vane is additionally arranged for pre-rotation adjustment, so that the flow loss and the impact loss at the impeller inlet of the centrifugal pump can be reduced, the hydraulic performance of the centrifugal pump is improved, the centrifugal pump has great market value, and the centrifugal pump is worthy of wide popularization and application.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. The utility model provides an impeller diameter adjustable centrifugal pump, includes pump case (1), sets up impeller (2) in pump case (1) to and can drive impeller (2) pivoted motor (3), its characterized in that: the pump shell (1) is also internally provided with a tensioning assembly capable of moving up and down, the impeller (2) is provided with a tensioning groove matched with the tensioning assembly, and the impeller (2) can be extruded or loosened by moving up and down the tensioning assembly, so that the diameter of the impeller (2) can be adjusted.

2. A centrifugal pump with an adjustable impeller diameter according to claim 1, wherein: the pump is characterized in that a motor (3) and a hydraulic cylinder (4) are respectively arranged on the upper side and the lower side of the pump shell (1), an output shaft (5) of the motor (3) penetrates through the interior of the pump shell (1) and is fixedly connected with an upper expansion tight plug (6) and an impeller (2) in sequence, and a piston rod (7) of the hydraulic cylinder (4) penetrates through the interior of the pump shell (1) and is rotatably connected with a lower expansion tight plug (8).

3. A centrifugal pump with an adjustable impeller diameter according to claim 2, wherein: the impeller (2) comprises a front cover plate (9), blades (10) and a rear cover plate (11) which are sequentially connected, a lower expansion groove matched with the lower expansion tight plug (8) is formed in the front cover plate (9), and an upper expansion groove matched with the upper expansion tight plug (6) is formed in the rear cover plate (11).

4. A centrifugal pump with an adjustable impeller diameter according to claim 3, wherein: the upper expansion tight plug (6) is fixedly connected in the upper expansion groove, the lower expansion tight plug (8) is movably connected in the lower expansion groove, and the upper expansion tight plug (6) and the lower expansion tight plug (8) are both in trapezoidal round platform structures and are symmetrically arranged with each other.

5. A centrifugal pump with an adjustable impeller diameter according to claim 2, wherein: the middle part of the lower expansion tightening plug (8) is provided with a mounting hole (12) matched with the piston rod (7), and the mounting hole (12) is rotatably connected with the piston rod (7) through a rolling bearing (13).

6. A centrifugal pump with an adjustable impeller diameter according to claim 2, wherein: an annular water inlet channel (15) with the diameter identical to that of a water inlet (14) of the impeller (2) penetrates through the lower expansion tight plug (8), a front guide vane (16) is arranged at the bottom of the water inlet channel (15), and a support steel bar (17) is arranged on the front guide vane (16).

7. A centrifugal pump with an adjustable impeller diameter according to claim 2, wherein: the motor (3) is installed above the pump shell (1) through a connecting piece (18), the hydraulic cylinder (4) is installed at the bottom of the pump shell (1) through an end cover (19), and a water inlet flange (20) and a water outlet flange (21) are respectively arranged on the left side and the right side of the pump shell (1).

8. A centrifugal pump with an adjustable impeller diameter according to claim 1, wherein: the impeller (2) is a closed impeller, and the impeller (2) is made of a stretchable high polymer material.