阅读说明：本技术 适用于多级离心压缩机的可调变弯度回流器及其控制方法 (Adjustable camber reflux device suitable for multistage centrifugal compressor and control method thereof ) 是由 梁奇 陈海生 左志涛 张雪辉 侯虎灿 郭文宾 于 2020-03-20 设计创作，主要内容包括：本发明公开了一种适用于多级离心压缩机的可调变弯度回流器及其控制方法,适用于压缩空气储能系统多级离心式压缩机领域,其中的变弯度回流器叶片包括独立可调的前缘调节段和固定的尾缘固定段。变弯度回流器通过一套独立的回流器叶片调节结构,可以改变前缘调节段的进口安装角度。本发明的主要优点是,回流器在多级离心式压缩机变工况时可以更好地适应上游流动状况,叶片通过调整进口安装角减小了进口冲击损失,改善了回流器内部流场状况,提升了压缩机工作性能,进而提升了储能系统整体性能。(The invention discloses an adjustable camber backflow device suitable for a multistage centrifugal compressor and a control method thereof, which are suitable for the field of multistage centrifugal compressors of compressed air energy storage systems. The variable camber return device can change the inlet installation angle of the front edge adjusting section through a set of independent return device blade adjusting structure. The invention has the main advantages that the reflux device can better adapt to the upstream flow condition when the multistage centrifugal compressor is in variable working conditions, the blades reduce the inlet impact loss by adjusting the inlet installation angle, improve the internal flow field condition of the reflux device, improve the working performance of the compressor and further improve the overall performance of the energy storage system.)

1. An adjustable camber backflow device suitable for a multistage centrifugal compressor, which comprises a backflow device blade adjusting mechanism, a compressor clapboard and a plurality of backflow device blades which are uniformly arranged on the front side of the compressor clapboard along the circumferential direction, wherein a plurality of diffuser blades are uniformly arranged on the rear side of the compressor clapboard along the circumferential direction,

the backflow device blade comprises a plurality of rotatable front edge adjusting sections and a plurality of fixedly arranged tail edge fixing sections, the rotatable front edge adjusting sections and the fixedly arranged tail edge fixing sections are uniformly arranged on the front side of the compressor partition board along the circumferential direction, the front edge adjusting sections are radially arranged on the periphery of the tail edge fixing sections, the number of the tail edge fixing sections is not less than that of the front edge adjusting sections, the rear end of each front edge adjusting section is rotatably spliced with the front end of one tail edge fixing section, the front end of each front edge adjusting section is formed as the front edge of the backflow device blade, the rear end of each tail edge fixing section is formed as the tail edge of the backflow device blade, the pressure surfaces of the front edge adjusting sections and the tail edge fixing sections are formed as the pressure surfaces of the backflow device blade together, and the suction surfaces of the front edge adjusting sections and the tail edge fixing sections are formed as the suction surfaces of the backflow device blade together;

and a transmission pull rod is fixedly arranged on the bottom wall of the rear end of each front edge adjusting section, penetrates through the compressor partition plate and the tail edge of the diffuser blade corresponding to the front edge adjusting section and is in transmission connection with the backflow device blade adjusting mechanism, and the backflow device blade adjusting mechanism drives the transmission pull rod to rotate to adjust the inlet mounting angle of each front edge adjusting section.

2. The adjustable camber flow-reverser according to the preceding claim, wherein the number of blades of the trailing edge stationary section is N times (N is greater than 1, and N can be 1, 2 …) the number of blades of the leading edge adjusting section, which can effectively improve the quality of the inlet flow field of the next-stage compressor.

3. The adjustable camber line according to the preceding claim, wherein each of said leading edge conditioning segments is circumferentially uniformly distributed about an outlet of a compressor curve.

4. The adjustable camber reflector of the preceding claim, wherein said reflector blade adjustment structure comprises an annular stationary disk and an annular rotatable disk disposed about an outer periphery of said annular stationary disk, the outer edge of the annular rotating disk is at least provided with a rotating actuator, the end surface of the annular rotating disk is fixedly provided with a plurality of rotating pulling plates arranged along the circumferential direction, the end surface of the annular fixed disk is rotatably connected with a plurality of transmission pulling plates arranged along the circumferential direction, the rotation pulling plates are in one-to-one transmission connection with the transmission pulling plates, the transmission pulling rods of the front edge adjusting sections are in one-to-one connection with the tail ends of the transmission pulling plates on the end surface of the annular fixed disk, the rotary actuator drives the annular rotary disc to rotate, then drives the tail end of the transmission pulling plate to rotate through the rotation pulling plate, and then drives the transmission pulling rod of each front edge adjusting section to rotate, so that the inlet installation angle of each front edge adjusting section is changed.

5. The adjustable camber reflow apparatus of claim 4, wherein the rotary actuator is an actuator linkage disposed on an outer edge of the annular rotating disk, the actuator linkage being driven by an electric or pneumatic actuator.

6. The adjustable camber line according to claim 4, wherein when compressor operating flow rates are less than design flow rates, said annular rotating disk is rotated by a rotary actuator in said vane modulating structure of the line, which in turn rotates the drive link of each leading edge modulating segment by said rotating and drive plates to reduce the inlet setting angle of each leading edge modulating segment, thereby adapting the leading edge of each said line to the incoming flow of the multistage compressor curve outlet.

7. The adjustable camber line according to claim 4, wherein when compressor operating flow rates are greater than design flow rates, the annular rotating disk is rotated by a rotary actuator in the vane modulating structure of the line compressor, and the drive links of each leading edge modulating segment are rotated by the rotary pull plate and the drive pull plate to increase the inlet setting angle of each leading edge modulating segment, thereby adapting the leading edge of each line compressor vane to the incoming flow of the curve outlet of the multi-stage compressor.

8. A method of controlling an adjustable camber flow-rate return for a multistage centrifugal compressor according to any one of the preceding claims,

when the working flow of the compressor is not equal to the design flow, the inlet installation angle of each front edge adjusting section is adjusted through the backflow device blade adjusting mechanism, so that the front edge of each backflow device blade adapts to the inflow of the curve outlet of the multistage compressor, the impact loss is reduced, and the flow field is improved.

9. The control method of claim 8, wherein when the compressor working flow is less than the design flow, the inlet setting angle of each leading edge adjusting section is reduced through the backflow blade adjusting mechanism, so that the leading edge of each backflow blade is adapted to the flow coming from the curve outlet of the multistage compressor, thereby reducing the impact loss and improving the flow field.

10. The control method of claim 8, wherein when the compressor working flow is larger than the design flow, the inlet setting angle of each leading edge adjusting section is increased through the backflow blade adjusting mechanism, so that the leading edge of each backflow blade is adapted to the flow coming from the curve outlet of the multistage compressor, thereby reducing the impact loss and improving the flow field.

Technical Field

The invention belongs to the technical field of compressed air energy storage, relates to a reflux device of a multistage centrifugal compressor, and particularly relates to an adjustable-camber reflux device suitable for the multistage centrifugal compressor and a control method thereof.

Background

The large-scale compressed air energy storage technology has the advantages of no geographic condition limitation, high energy storage efficiency, environmental friendliness, capability of recovering waste heat and the like, has important values in peak clipping and valley filling of a power grid, renewable energy grid connection and a distributed energy system, and is considered to be one of large-scale physical energy storage technologies with the most development potential. In combination with the characteristics of compressed air energy storage technology, a multi-stage centrifugal compressor is usually selected as the compressor used in the system. The reflux device is one of the main parts of the multistage centrifugal compressor, and the performance of the reflux device has important influence on the efficiency, the pressure ratio, the operating condition range and the like of the whole machine.

The reflux device structure commonly used in the multi-stage centrifugal compressor at present consists of a clapboard and a guide vane, wherein the guide vane is usually cast into a whole with a cylinder or is separately manufactured and then is connected by a bolt, so that the installation angle of an inlet of the guide vane is fixed. The installation angle of the inlet of the vane of the reflux device is related to the impact loss of the inlet of the reflux device and the flow condition of a boundary layer on the upper surface of the vane surface, and the performance is better under the design working condition and poorer under the non-design working condition. Under the working condition of small flow, the flow phenomena of stall, vortex shedding and the like on the blades of the reflux device are caused in advance by the overlarge inlet installation angle, so that the pressure in the reflux device is strongly fluctuated to trigger the surge of the compressor, and the flow regulation range is narrowed.

Disclosure of Invention

Aiming at the defects and shortcomings in the prior art, the invention aims to provide the adjustable-camber backflow device suitable for the multistage centrifugal compressor and the control method thereof, wherein the backflow device blades are arranged into a front edge adjusting section and a tail edge fixing section, and a front edge adjusting structure is arranged to change the inlet installation angle of each front edge adjusting section, so that the upstream flow condition can be better adapted, and the performance of the whole machine is improved; the number of the blades of the trailing edge fixing section is set to be larger than that of the blades of the leading edge adjusting section, so that the quality of an inlet flow field of a next-stage compressor can be effectively improved. Through the structural arrangement, the adjustable-camber backflow device applicable to the multistage centrifugal compressor and the control method thereof can reduce the flow loss of the existing structure, improve the internal flow field condition of the backflow device and improve the performance of the multistage centrifugal compressor.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

an adjustable camber backflow device suitable for a multistage centrifugal compressor, which comprises a backflow device blade adjusting mechanism, a compressor clapboard and a plurality of backflow device blades which are uniformly arranged on the front side of the compressor clapboard along the circumferential direction, wherein a plurality of diffuser blades are uniformly arranged on the rear side of the compressor clapboard along the circumferential direction,

the backflow device blade comprises a plurality of rotatable front edge adjusting sections and a plurality of fixedly arranged tail edge fixing sections, the rotatable front edge adjusting sections and the fixedly arranged tail edge fixing sections are uniformly arranged on the front side of the compressor partition board along the circumferential direction, the front edge adjusting sections are radially arranged on the periphery of the tail edge fixing sections, the number of the tail edge fixing sections is not less than that of the front edge adjusting sections, the rear end of each front edge adjusting section is rotatably spliced with the front end of one tail edge fixing section, the front end of each front edge adjusting section is formed as the front edge of the backflow device blade, the rear end of each tail edge fixing section is formed as the tail edge of the backflow device blade, the pressure surfaces of the front edge adjusting sections and the tail edge fixing sections are formed as the pressure surfaces of the backflow device blade together, and the suction surfaces of the front edge adjusting sections and the tail edge fixing sections are formed as the suction surfaces of the backflow device blade together;

and a transmission pull rod is fixedly arranged on the bottom wall of the rear end of each front edge adjusting section, penetrates through the compressor partition plate and the tail edge of the diffuser blade corresponding to the front edge adjusting section and is in transmission connection with the backflow device blade adjusting mechanism, and the backflow device blade adjusting mechanism drives the transmission pull rod to rotate to adjust the inlet mounting angle of each front edge adjusting section.

Preferably, the number of the blades of the trailing edge fixing section is N times that of the blades of the leading edge adjusting section (N is greater than 1, and the value of N may be 1 or 2 …), so that the quality of an inlet flow field of a next-stage compressor can be effectively improved.

Preferably, each of said leading edge conditioning segments is circumferentially evenly distributed around the outlet of the compressor curve.

Preferably, the blade adjusting structure of the backflow device comprises an annular fixed disk and an annular rotating disk arranged on the periphery of the annular fixed disk, at least one rotating actuator is arranged on the outer edge of the annular rotating disk, a plurality of rotating pulling plates arranged along the circumferential direction are fixedly arranged on the end face of the annular rotating disk, the end face of the annular fixed disk is connected with a plurality of transmission pulling plates arranged along the circumferential direction in a rotating mode, the rotating pulling plates are connected with the transmission pulling plates in a one-to-one transmission mode, each transmission pulling rod of the front edge adjusting section is connected with the tail ends of the transmission pulling plates on the end face of the annular fixed disk one by one, the rotating actuator drives the annular rotating disk to rotate and then drive the tail ends of the transmission pulling plates through the rotating pulling plates, and then drives each transmission pulling rod of the front edge adjusting section to rotate, so that the inlet installation angle of each front edge.

Further, the rotary actuator is an actuator pull rod arranged on the outer edge of the annular rotary disc, and the actuator pull rod is driven by an electric or pneumatic actuator.

Further, when the working flow of the compressor is smaller than the designed flow, the annular rotating disc is driven to rotate by the rotating actuator in the backflow device blade adjusting structure, and then the rotating pull plate and the transmission pull plate drive the transmission pull rod of each front edge adjusting section to rotate so as to reduce the inlet installation angle of each front edge adjusting section, so that the front edge of each backflow device blade adapts to the inlet flow of the curve outlet of the multi-stage compressor.

Further, when the working flow of the compressor is larger than the designed flow, the annular rotating disc is driven to rotate by the rotating actuator in the backflow device blade adjusting structure, and then the rotating pull plate and the transmission pull plate drive the transmission pull rod of each front edge adjusting section to rotate so as to increase the inlet installation angle of each front edge adjusting section, so that the front edge of each backflow device blade adapts to the inlet flow of the curve outlet of the multi-stage compressor.

Another technical object of the present invention is to provide a method for controlling an adjustable camber return for a multistage centrifugal compressor as described above, characterized in that,

when the working flow of the compressor is not equal to the design flow, the inlet installation angle of each front edge adjusting section is adjusted through the backflow device blade adjusting mechanism, so that the front edge of each backflow device blade adapts to the inflow of the curve outlet of the multistage compressor, the impact loss is reduced, and the flow field is improved.

Preferably, when the working flow of the compressor is smaller than the design flow, the inlet installation angle of each leading edge adjusting section is reduced through the backflow device blade adjusting mechanism, so that the leading edge of each backflow device blade adapts to the inflow of the curve outlet of the multistage compressor, thereby reducing the impact loss and improving the flow field.

Preferably, when the working flow of the compressor is larger than the design flow, the inlet installation angle of each leading edge adjusting section is increased through the backflow device blade adjusting mechanism, so that the leading edge of each backflow device blade adapts to the inflow of the curve outlet of the multistage compressor, thereby reducing the impact loss and improving the flow field.

Compared with the prior art, the adjustable bending degree reflux device suitable for the multistage centrifugal compressor and the control method thereof have the following advantages: (1) the adjustable camber backflow device blade provided by the invention comprises an independently adjustable front edge adjusting section and a fixedly arranged tail edge fixing section. (2) The adjustable camber reflux device provided by the invention can change the inlet installation angle of the front edge adjusting section through a set of independent confluence device adjusting structure, better adapt to the upstream flow condition and improve the performance of the whole device. (3) According to the adjustable camber reflux device provided by the invention, the number of the blades of the tail edge fixing section can be larger than that of the blades of the front edge adjusting section, so that the inlet flow field quality of the next-stage compressor can be effectively improved.

Drawings

FIG. 1 is a schematic view of an adjustable camber return for a multistage centrifugal compressor according to the present invention;

FIG. 2 is a front view of the adjustable camber reflector of the present invention;

FIG. 3 is a schematic view of the vane structure of the air return of the present invention;

FIG. 4 is a block diagram of the return vane of the adjustable camber return of the present invention at low flow rates;

FIG. 5 is a block diagram of the diffuser vanes at high flow for the variable camber diffuser of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and examples. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:

1-actuator, 2-rotary actuator, 3-fixed disk, 4-transmission pulling plate, 5-rotation pulling plate, 6-rotating disk, 7-transmission connecting rod, 8-diffuser blade, 9-compressor impeller, 10-leading edge adjusting section, 11-trailing edge fixing section, 101-cover cap, 102-bearing, 103-distance sleeve, 104-O-shaped ring, 105-outer sleeve, 106-O-shaped ring, 107-tetrafluoro sleeve and 108-compressor partition plate.

Referring to fig. 1 and 2, the variable camber flow reverser suitable for a multistage centrifugal compressor comprises a flow reverser vane adjusting mechanism, a compressor partition 108 and a plurality of flow reverser vanes evenly arranged on the front side of the compressor partition 108 along the circumferential direction, wherein all the flow reverser vanes are evenly distributed around the outlet of a curve of the multistage compressor in an annular shape. The backflow device blade is composed of a front edge adjusting section 10 and a tail edge fixing section 11, the front edge adjusting section 10 is rotatably arranged on a compressor partition plate 108, the tail edge fixing section 11 is fixedly arranged on the compressor partition plate 108, and a certain gap exists between the front edge adjusting section 10 and the tail edge fixing section 11 in the radial direction. The front end of the front edge adjusting section 10 is formed as the front edge of the backflow device blade, the rear end of the tail edge fixing section 11 is formed as the tail edge of the backflow device blade, the pressure surfaces of the front edge adjusting section 10 and the tail edge fixing section 11 form the pressure surface of the backflow device blade together, and the suction surfaces of the front edge adjusting section 10 and the tail edge fixing section 11 form the suction surface of the backflow device blade together. The rear end bottom wall of the front edge adjusting section 10 is fixedly provided with a transmission pull rod 7, the transmission pull rod 7 is rotatably connected with the backflow device blade adjusting mechanism after penetrating through the tail edges of the compressor partition plate 108 and the diffuser blades 8, and the backflow device blade adjusting mechanism can drive the transmission pull rod 7 to rotate so as to adjust the inlet installation angle of each front edge adjusting section 10.

Referring to fig. 1-3, the vane adjusting mechanism of the backflow device is an adjusting structure of a front edge of a vane of the backflow device, and comprises an annular fixed disk 3 and an annular rotating disk 6 arranged at the periphery of the annular fixed disk 3, at least one rotating actuator 2 is arranged on the outer edge of the annular rotating disk 6, a plurality of rotating pull plates 5 arranged along the circumferential direction are fixedly arranged on the bottom surface of the annular rotating disk 6, a plurality of transmission pull plates 4 arranged along the circumferential direction are rotatably connected on the bottom surface of the annular fixed disk 3, the rotating pull plates 5 are in transmission connection with the transmission pull plates 4 one by one, the rotating pull plates 4 are in pin connection with the transmission connecting rods 7, a bearing 102 is arranged in the middle of the rotating pull. The transmission pull rod 7 of each front edge adjusting section 10 penetrates through the top surface of the annular fixed disk 3 and is in pin joint with the tail end of the transmission pull plate 4 arranged on the bottom surface, the rotation actuator 2 drives the annular rotating disk 6 to rotate, then the tail end of the transmission pull plate 4 is driven to rotate through the rotation pull plate 5, and then the transmission pull rod 7 of each front edge adjusting section 10 is driven to rotate, so that the inlet installation angle of each front edge adjusting section 10 is changed.

As shown in fig. 4, when the working flow of the compressor is smaller than the design flow, the flow angle at the outlet of the curve decreases, the flow impacts the pressure surface of the vane of the backflow device to form a positive attack angle, and the suction surface is easy to flow and separate, firstly, the rotary actuator 2 in the vane adjusting structure of the backflow device drives the annular rotary disc 6 to rotate, and then the rotary pull plate 5 and the transmission pull plate 4 drive the transmission pull rods 7 of the front edge adjusting sections 10 to rotate, so that the installation angle at the inlet of the front edge adjusting section 10 decreases, the front edge of the vane of the backflow device adapts to the incoming flow at the outlet of the curve, the impact loss is reduced, and the flow field is improved.

As shown in fig. 5, when the working flow of the compressor is greater than the design flow, the flow angle at the outlet of the curve increases, the flow impacts the suction surface of the vane of the backflow device to form a negative attack angle, the pressure surface is easy to flow and separate, the rotary actuator 2 in the vane adjusting structure of the backflow device drives the annular rotary disk 6 to rotate, then the rotary pull plate 5 and the transmission pull plate 4 drive the transmission pull rod 7 of each front edge adjusting section 10 to rotate, so that the installation angle at the inlet of the front edge adjusting section 10 increases, the front edge of the vane of the backflow device adapts to the incoming flow at the outlet of the curve, the impact loss is reduced, and the flow field is improved.

The above description is only a preferred embodiment of the present invention, and the driving mechanism may be in the form of a gear mechanism or the like in addition to the link mechanism, and it will be apparent to those skilled in the art that the present invention may be variously modified and changed. 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.