CN111336115A - Centrifugal impeller assembly and variable speed adjustable centrifugal unit - Google Patents

Abstract

The invention is suitable for the field of electrical equipment, and provides a centrifugal impeller assembly and a variable-speed adjustable centrifugal unit, wherein the centrifugal impeller assembly comprises: a housing; a centrifugal impeller; diffuser vanes; the connecting shaft is used for driving the diffuser blades to rotate; the connecting shaft is connected with the diffuser blades, and the diffuser blades are rotatably arranged on the shell; the variable geometry adjusting mechanism is used for driving the connecting shaft to rotate so as to adjust the installation angle of the diffuser blades in the shell; and the locking assembly is used for locking the centrifugal impeller. The centrifugal unit comprising the centrifugal impeller assembly provided by the embodiment of the invention is convenient for rapidly adjusting the diffuser, can meet the working condition of repeated and rapid change of the working condition by using a direct drive and adjustable diffuser mode, and has the advantages of large capacity, wider working range and efficiency, capability of avoiding surge of the unit and the like.

Description

Centrifugal impeller assembly and variable speed adjustable centrifugal unit

Technical Field

The invention belongs to the field of electrical equipment, and particularly relates to a centrifugal impeller assembly and a variable-speed adjustable centrifugal unit.

Background

In practical application of a centrifugal unit (including a centrifugal blower, a centrifugal compressor, a centrifugal vacuum pump and the like), the pressure demand fluctuation range of many application scenes is large, and the change frequency is fast. Under the application condition, the existing centrifugal unit only changes speed, and the working range is too narrow, as shown in fig. 5, when the rotating speed changes, the working point changes along the red line, the flow range is reduced when the rotating speed is low, and the unit efficiency is poor. Similarly, if the existing centrifugal unit only adjusts the geometric angle of the diffuser, although the working range is enlarged, the consumption of the centrifugal unit is greatly increased at a low pressure point, and particularly for a centrifugal vacuum pump, the power increase rate is highest, as shown in fig. 6, as the installation angle is enlarged, the flow rate is increased, the power is also sharply increased, and the working efficiency of the unit is low. In practical applications such as VPSA, if the application of the centrifugal unit (including the centrifugal vacuum pump and the centrifugal blower) does not solve the problems of working range and power consumption at the same time, the application and popularization of the centrifugal unit are severely restricted and even difficult to popularize.

In addition, the working conditions applied to the existing centrifugal unit are mostly stable or slow-changing working conditions. The typical centrifugal unit is mainly structured by a power frequency motor, a speed increasing box and a centrifugal machine, and is developed for decades, the centrifugal unit with the structure is applied to various industrial systems, such as a blast furnace fan, a deep cooling oxygen production air compressor, an aeration fan, a central air conditioning compressor and the like, in recent years, centrifugal units directly driven by high-speed motors are increasingly applied in the industries of the aeration fan and the air conditioning compressor, the application of the centrifugal machine and the high-speed motor in integration is promoted by depending on the development of the high-speed motors, the problem that the mechanical loss of the traditional centrifugal unit is too large in a middle-size and small-size centrifugal machine is solved, the process adaptability of the unit is improved by adjusting the rotating speed, the energy consumption of the unit is greatly reduced, and typical products are a magnetic suspension aeration fan, an air flotation aeration fan, a magnetic suspension refrigeration compressor and the like.

Although the energy consumption of the existing direct-drive centrifugal unit is greatly improved, and the existing direct-drive centrifugal unit also has the condition of real-time rotating speed adjustment, the existing direct-drive centrifugal unit also has the defects of narrow working range, low response speed and the like in the occasions needing quick response such as VPSA (vacuum pressure swing SA), and the like, and particularly has small flow at a low rotating speed point or a low pressure point, which can generate great influence on the overall performance, so that the efficiency and the efficiency of the unit are low.

Disclosure of Invention

It is an aim of embodiments of the present invention to provide a centrifugal impeller assembly which addresses the problems set out in the background.

Embodiments of the present invention are achieved by a centrifugal impeller assembly, comprising:

a housing; a centrifugal impeller;

diffuser vanes; the centrifugal impeller and the diffuser blades are movably arranged in the shell; the connecting shaft is used for driving the diffuser blades to rotate; the connecting shaft is connected with the diffuser blades, and the diffuser blades are rotatably arranged on the shell;

the variable geometry adjusting mechanism is used for driving the connecting shaft to rotate so as to adjust the installation angle of the diffuser blades in the shell;

and the locking assembly is used for locking the centrifugal impeller so as to enable the centrifugal impeller to be detachably connected with the shaft piece which is used for driving the centrifugal impeller to rotate.

As a preferable aspect of the embodiment of the present invention, the variable geometry adjustment mechanism includes:

the driven part is used for driving the connecting shaft to rotate; the driven piece is connected with the connecting shaft;

the driving part is used for driving the driven part to rotate; the driven part and the driving part are in transmission fit;

and the servo motor is used for driving the driving part to drive the driven part to rotate.

As another preferable aspect of the embodiment of the present invention, the driven member is a driven gear; the driving part is a driving gear; the driven part is meshed with the driving part; the servo motor is connected with the driving part.

As another preferable scheme of the embodiment of the invention, the diffuser blades are provided with a plurality of groups; and a plurality of groups of diffuser blades are annularly distributed in the shell.

As another preferred scheme of the embodiment of the invention, the driven member is a toothed synchronous wheel, and the driven member is provided with a plurality of groups; the driving piece is a tooth-shaped synchronous belt; a plurality of groups of driven parts are all meshed with the driving part; at least one group of servo motors is arranged; the servo motor is used for driving the driving part to operate.

Another object of an embodiment of the present invention is to provide a variable speed adjustable centrifugal machine set, which includes:

the centrifugal impeller assembly described above;

and the driving assembly is used for driving the centrifugal impeller to rotate.

As another preferable aspect of the embodiment of the present invention, the driving assembly includes:

a main shaft; the main shaft is connected with the centrifugal impeller through the locking assembly;

the turbine is used for driving the main shaft to rotate.

As another preferable aspect of the embodiment of the present invention, the locking assembly includes:

locking the nut;

a connecting member; one end of the connecting piece is in threaded connection with the main shaft, and the other end of the connecting piece penetrates through the centrifugal impeller to be in threaded connection with the locking nut.

As another preferable scheme of the embodiment of the present invention, an elastic sleeve is provided between the lock nut and the centrifugal impeller.

As another preferable aspect of the embodiment of the present invention, the driving assembly includes:

a drive motor; a motor shaft of the driving motor is connected with the centrifugal impeller through the locking assembly;

the frequency converter is used for controlling the rotating speed of the driving motor; the frequency converter is electrically connected with the driving motor.

According to the centrifugal impeller assembly provided by the embodiment of the invention, the variable geometry adjusting mechanism is arranged to drive the diffuser blades and the connecting shaft to rotate so as to adjust the installation angle and position of the diffuser blades in the shell, so that the flow and power of a centrifugal unit can be conveniently controlled under the cooperation of the variable-speed driving assembly. In addition, the variable-speed adjustable centrifugal unit provided by the embodiment of the invention is convenient for rapidly adjusting the diffuser, can meet the working condition of repeated and rapid change of the working condition by using a direct drive and adjustable diffuser mode, and has the advantages of large capacity, wider working range and efficiency, capability of avoiding surge of the unit and the like.

Drawings

Fig. 1 is a schematic structural diagram of a centrifugal impeller assembly according to an embodiment of the present invention.

Fig. 2 is a partially enlarged view of a portion a in fig. 1.

Fig. 3 is a schematic structural diagram of a variable speed adjustable centrifuge set according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of another variable-speed adjustable centrifuge set according to an embodiment of the present invention.

Fig. 5 is a graph showing the operation curve of a conventional fixed diffuser-variable speed centrifugal unit.

Fig. 6 is a graph of the operation curve of the conventional variable geometry diffuser constant speed centrifugal unit.

Fig. 7 is a graph showing the operation of the variable speed adjustable centrifugal unit according to the embodiment of the present invention.

In the figure: 1-shell, 2-centrifugal impeller, 3-support plate, 4-elastic sleeve, 5-lock nut, 6-connecting piece, 7-diffuser blade, 8-connecting shaft, 9-driven piece, 10-driving piece, 11-servo motor, 12-first support bearing, 13-support box, 14-main shaft, 15-second support bearing, 16-third support bearing, 17-turbine impeller, 18-adjustable nozzle, 19-driving motor and 20-frequency converter.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In addition, in the description of the present application, terms used should be construed broadly, and specific meanings of the terms may be understood by those skilled in the art according to actual situations. For example, the terms "disposed" and "disposed," as used in this application, may be defined as either a contact or a non-contact arrangement, etc.; all the terms of orientation used are used with reference to the drawings or are based on the direction defined by the actual situation and the common general knowledge.

In one embodiment of the present invention, as shown in fig. 1 and 2, there is provided a centrifugal impeller assembly comprising:

a housing 1;

a centrifugal impeller 2;

diffuser vanes 7; the centrifugal impeller 2 and the diffuser blades 7 are movably arranged in the shell 1;

the connecting shaft 8 is used for driving the diffuser blades 7 to rotate; the connecting shaft 8 is connected with the diffuser blades 7, and the diffuser blades 7 are rotatably arranged on the shell 1;

the variable geometry adjusting mechanism is used for driving the connecting shaft 8 to rotate so as to adjust the installation angle of the diffuser blades 7 in the shell 1;

and the locking assembly is used for locking the centrifugal impeller 2 so that the centrifugal impeller 2 and a shaft part for driving the centrifugal impeller 2 to rotate are detachably connected.

In practical application, in order to reduce the inertia of the centrifugal impeller, the outlet of the centrifugal impeller 2 can be designed into a mixed flow form with an oblique angle; diffuser vanes 7 are located between the centrifugal impeller 2 and the inner wall of the housing 1; the diffuser blades 7 can be arranged in multiple groups to form a blade diffuser; the diffuser blade 7 and the connecting shaft 8 can be integrally formed and processed; in addition, a supporting plate 3 can be fixedly arranged outside the shell 1; the connecting shaft 8 may be rotatably mounted on the support plate 3 by means of a first support bearing 12.

In the embodiment of the invention, the variable geometry adjusting mechanism is arranged to drive the diffuser blades 7 and the connecting shaft 8 to rotate so as to adjust the installation angle and position of the diffuser blades 7 in the shell 1, thereby facilitating the control of the flow and power of the centrifugal unit under the cooperation of the variable-speed driving assembly.

In a preferred embodiment of the present invention, as shown in fig. 2, the variable geometry adjustment mechanism comprises:

the driven part 9 is used for driving the connecting shaft 8 to rotate; the driven part 9 is connected with the connecting shaft 8;

the driving part 10 is used for driving the driven part 9 to rotate; the driven part 9 and the driving part 10 are in transmission fit;

and the servo motor 11 is used for driving the driving part 10 to drive the driven part 9 to rotate.

Specifically, the driven member 9 can be fixedly mounted on the connecting shaft 8 through bolts and nuts; the servo motor 11 may be mounted on the support plate 3.

In another preferred embodiment of the invention, the driven member 9 may be an existing conventional driven gear; the driving member 10 may be a conventional driving gear; the driven part 9 is meshed with the driving part 10; the motor shaft of the servo motor 11 is connected with the driving part 10. Can drive the driving part 10 through servo motor 11 and rotate, the rotation of driving part 10 can drive follower 9 and rotate, and the rotation of follower 9 can drive connecting axle 8 and rotate, and the rotation of connecting axle 8 can drive diffuser blade 7 and rotate to adjust the position and the angle of diffuser blade 7.

In another preferred embodiment of the invention, as shown in fig. 1, the diffuser vanes 7 are provided in groups; a plurality of groups of diffuser blades 7 are annularly distributed in the shell 1.

Specifically, the diffuser blades 7 may be arranged in six groups or more than six groups, and the number of the followers 9 is the same as that of the diffuser blades 7, but is not limited thereto; the number of the driving members 10 may be set as a group or the same as the number of the diffuser blades 7, and may be selected according to the structure of the driving members 10.

For example, in another preferred embodiment of the present invention, the driven member 9 is a toothed synchronous wheel, and the driven member 9 is provided with a plurality of groups; the driving piece 10 is a tooth-shaped synchronous belt; a plurality of groups of driven parts 9 are meshed with the driving part 10; at least one group of servo motors 11 is arranged; the servo motor 11 is used for driving the driving member 10 to operate.

Specifically, the number of the driven members 9 corresponds to the number of the diffuser blades 7 one by one, and the driving members 10 are only arranged in one group; each group of driven parts 9 is meshed with a driving part 10, and the driving part 10 is of an annular structure; in addition, one or more groups of servo motors 11 can be arranged, and a motor shaft of the servo motor 11 can be connected with one group of driven parts 9, or can be connected with the motor shaft of the servo motor 11 by additionally arranging a tooth-shaped driving wheel meshed with the driving part 10. The driving part 10 can be driven to operate through the servo motor 11, so that a plurality of groups of driven parts 9 can be driven to synchronously rotate, and the purpose of adjusting the positions of a plurality of groups of diffuser blades 7 simultaneously is achieved.

In another embodiment of the present invention, there is also provided a variable speed adjustable centrifuge assembly comprising:

the centrifugal impeller assembly described above;

and the driving assembly is used for driving the centrifugal impeller 2 to rotate.

In particular, the drive assembly is a variable speed drive assembly which may employ a variable frequency motor or turbine as is known in the art. In addition, the centrifugal unit may be, but is not limited to, a centrifugal blower, a centrifugal vacuum pump, a centrifugal compressor, or the like.

In another preferred embodiment of the present invention, as shown in fig. 3, the driving assembly comprises:

a main shaft 14; the main shaft 14 is connected with the centrifugal impeller 2 through the locking assembly;

a turbine for driving the main shaft 14 in rotation.

In particular, the structure of the turbine may be the same as that of a turbine commonly known in the prior art, which comprises a turbine wheel 17 and an adjustable nozzle 18, through which the centrifugal impeller 2 is directly driven in rotation; two ends of the main shaft 14 are rotatably mounted on the supporting box body 13 through a second supporting bearing 15 and a third supporting bearing 16 respectively; the second support bearing 15 and the third support bearing 16 can be roller bearings or magnetic bearings, which are used to bear the impact caused by the rapid change of the rotation speed of the main shaft 14. The turbine impeller 17 is connected with the centrifugal impeller 2 through the main shaft 14, the main shaft 14 can be driven to rotate through the rotation of the turbine impeller 17, and the centrifugal impeller 2 can be driven to rotate through the rotation of the main shaft 14. The adjustment of the rotation speed of the centrifugal impeller 2 may be adaptive matching adjustment of the characteristics of the turbine and the centrifugal impeller 2, or may be performed actively by adjusting the adjustable nozzle 18 of the turbine, and generally, in order to achieve a better energy saving effect, the efficiency of actively adjusting the rotation speed by using the adjustable nozzle 18 is higher.

In another preferred embodiment of the present invention, as shown in fig. 3, the locking assembly comprises:

a lock nut 5;

a connecting piece 6; one end of the connecting piece 6 is in threaded connection with the main shaft 14, and the other end of the connecting piece 6 penetrates through the centrifugal impeller 2 to be in threaded connection with the locking nut 5.

Specifically, both ends of the connecting piece 6 are provided with external threads, and the end part of the main shaft 14 is provided with a threaded hole matched with the external threads at one end of the connecting piece 6; the locking nut 5 is matched with the external thread at the other end of the connecting piece 6; an elastic sleeve 4 can be arranged between the locking nut 5 and the centrifugal impeller 2. In addition, the connection mode between the main shaft 14 and the turbine impeller 17 can also adopt the same structure as the locking assembly for connection and locking, so as to improve the stability of the centrifugal impeller 2, the main shaft 14 and the turbine impeller 17 during variable-speed rotation.

As shown in fig. 7, when the centrifugal unit provided in this embodiment is in use, when the servo motor 11 adjusts the diffuser blades 7 to a smaller installation angle, the centrifugal impeller 2 operates at a low-flow operating point corresponding to a design point (e.g., an operating point B in fig. 7) of the centrifugal unit at a high rotational speed, and at the operating point, a high-pressure low-flow is required; when the servo motor 11 adjusts the diffuser blades 7 at a large installation angle, the impeller works at a large flow operating point corresponding to a design point of low rotation speed of the unit (such as an operating point C shown in fig. 7), and at the operating point, low pressure and large flow are required. In addition, when the centrifugal unit is operated at a high pressure point (such as an operating point B shown in figure 7), the turbine impeller 17 and the centrifugal impeller 2 operate at a high rotating speed, the diffuser blades 7 are adjusted at a small installation angle position through the servo motor 11, when the centrifugal unit is operated at a low pressure point (such as an operating point C shown in figure 7), the turbine impeller 17 and the centrifugal impeller 2 operate at a low rotating speed, and the diffuser blades 7 are adjusted at a large installation angle position through the servo motor 11.

In another preferred embodiment of the present invention, as shown in fig. 4, there is provided a driving assembly of another structure, the driving assembly including:

a drive motor 19; the motor shaft of the driving motor 19 is connected with the centrifugal impeller 2 through the locking assembly;

a frequency converter 20 for controlling the rotation speed of the drive motor 19; the frequency converter 20 is electrically connected to the driving motor 19.

Specifically, the driving motor 19 and the frequency converter 20 are common components in the prior art; the structure of the locking assembly may be the same as that of the locking assembly in the above-described embodiment. The centrifugal impeller 2 can be directly driven into rotation by the drive motor 19. In addition, the rotation speed of the driving motor 19 can be adjusted by converting the output frequency of the frequency converter 20, so as to control the rotation speed of the centrifugal impeller 2.

As shown in fig. 7, in the centrifugal unit provided in this embodiment, when the centrifugal unit operates at a high pressure point (e.g., operating point B in fig. 7), the driving motor 19 and the centrifugal impeller 2 operate at a high rotation speed, the diffuser blades 7 are adjusted at a small installation angle position by the servo motor 11, when the centrifugal unit operates at a low pressure point (e.g., operating point C in fig. 7), the driving motor 19 and the centrifugal impeller 2 operate at a low rotation speed, and the diffuser blades 7 are adjusted at a large installation angle position by the servo motor 11.

In summary, the variable speed adjustable centrifugal unit provided by the embodiment of the invention is convenient for rapidly adjusting the diffuser, can meet the repeatedly and rapidly changing working condition in a manner of directly driving and adjusting the diffuser, and has the advantages of large capacity, wide working range and efficiency, capability of avoiding surge of the unit and the like. This centrifugal unit passes through the linkage adjustment of rotational speed and diffuser geometry, can realize that flow increases, power reduce by a wide margin under the low pressure, and this kind of improvement has multiple meaning to the unit application that has the quick response requirement: firstly, the flow compression (relative to a centrifugal blower and a compressor) or suction (relative to a centrifugal vacuum pump) capacity of the whole unit is improved; secondly, the whole-process consumption of the unit is reduced, even the whole-process consumption is greatly reduced; thirdly, parameters of a unit design point can be reduced, namely flow requirement parameters of the unit design point can be reduced, installed power is reduced, and the overall cost of the unit is reduced; and fourthly, under the condition that multistage series-parallel connection is needed, the risks of unit surge and blockage can be avoided.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The utility model provides a centrifugal impeller subassembly, includes casing, centrifugal impeller and diffuser blade, centrifugal impeller with the equal activity of diffuser blade sets up in the casing, its characterized in that, centrifugal impeller subassembly still includes:

the connecting shaft is used for driving the diffuser blades to rotate; the connecting shaft is connected with the diffuser blades, and the diffuser blades are rotatably arranged on the shell;

the variable geometry adjusting mechanism is used for driving the connecting shaft to rotate so as to adjust the installation angle of the diffuser blades in the shell;

and the locking assembly is used for locking the centrifugal impeller so as to enable the centrifugal impeller to be detachably connected with the shaft piece which is used for driving the centrifugal impeller to rotate.

2. The centrifugal impeller assembly of claim 1, wherein the variable geometry adjustment mechanism comprises:

the driven part is used for driving the connecting shaft to rotate; the driven piece is connected with the connecting shaft;

the driving part is used for driving the driven part to rotate; the driven part and the driving part are in transmission fit;

and the servo motor is used for driving the driving part to drive the driven part to rotate.

3. A centrifugal impeller assembly according to claim 2, wherein the driven member is a driven gear; the driving part is a driving gear; the driven part is meshed with the driving part; the servo motor is connected with the driving part.

4. The centrifugal impeller assembly of claim 2 wherein said diffuser blades are provided in groups; and a plurality of groups of diffuser blades are annularly distributed in the shell.

5. The centrifugal impeller assembly of claim 4 wherein said driven member is a toothed synchronizing wheel, said driven member being provided in sets; the driving piece is a tooth-shaped synchronous belt; a plurality of groups of driven parts are all meshed with the driving part; at least one group of servo motors is arranged; the servo motor is used for driving the driving part to operate.

6. A variable speed adjustable centrifuge group comprising:

a centrifugal impeller assembly according to any one of claims 1 to 5;

and the driving assembly is used for driving the centrifugal impeller to rotate.

7. The variable speed adjustable centrifuge assembly of claim 6, wherein the drive assembly comprises:

a main shaft; the main shaft is connected with the centrifugal impeller through the locking assembly;

the turbine is used for driving the main shaft to rotate.

8. The variable speed adjustable centrifuge assembly of claim 7, wherein the locking assembly comprises:

locking the nut;

a connecting member; one end of the connecting piece is in threaded connection with the main shaft, and the other end of the connecting piece penetrates through the centrifugal impeller to be in threaded connection with the locking nut.

9. The variable speed adjustable centrifuge assembly of claim 8 wherein a resilient sleeve is disposed between said lock nut and said centrifugal impeller.

10. The variable speed adjustable centrifuge assembly of claim, wherein the drive assembly comprises:

a drive motor; a motor shaft of the driving motor is connected with the centrifugal impeller through the locking assembly;

the frequency converter is used for controlling the rotating speed of the driving motor; the frequency converter is electrically connected with the driving motor.

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