阅读说明：本技术 一种立式汽轮给水泵同轴一体转子结构 (Coaxial integrated rotor structure of vertical turbine water-feeding pump ) 是由 钱勇 孙奇 倪剑 周勇 侯明军 田瑞青 廖健鑫 王文武 刘海杰 于 2020-12-30 设计创作，主要内容包括：本发明公开了一种立式汽轮给水泵同轴一体转子结构,包括转子体、设置在转子体上的叶轮、设置在叶轮上的双列复速级动叶片和设置在转子体上且位于叶轮下方的泵轮,泵轮与转子体间隙配合,泵轮下方设置有与转子体螺纹连接的下锁紧螺母。本发明的有益效果是：本方案使汽轮机、给水泵共用转子,取消了联轴器,减少了汽轮机侧常规汽封、给水泵侧填料密封或机械密封,能够极大缩减转子轴向尺寸,提高转子整体的刚度,使得转子轴系振动特性好。(The invention discloses a coaxial integrated rotor structure of a vertical steam turbine feed pump, which comprises a rotor body, an impeller arranged on the rotor body, double-row compound speed stage moving blades arranged on the impeller and a pump wheel arranged on the rotor body and positioned below the impeller, wherein the pump wheel is in clearance fit with the rotor body, and a lower locking nut in threaded connection with the rotor body is arranged below the pump wheel. The invention has the beneficial effects that: this scheme makes steam turbine, feed pump sharing rotor, has cancelled the shaft coupling, has reduced the conventional vapor seal of steam turbine side, feed pump side packing seal or mechanical seal, can greatly reduce rotor axial dimensions, improves the holistic rigidity of rotor for rotor shafting vibration characteristic is good.)

1. The utility model provides a coaxial integrative rotor structure of vertical turbine feed pump which characterized in that: the double-row compound speed stage rotor comprises a rotor body (5), an impeller arranged on the rotor body (5), double-row compound speed stage moving blades arranged on the rotor body (5) and a pump wheel arranged on the rotor body (5) and positioned below the impeller, wherein the pump wheel is in clearance fit with the rotor body (5), and a lower locking nut (14) in threaded connection with the rotor body (5) is arranged below the pump wheel.

2. The coaxial integrated rotor structure of the vertical turbine feed water pump as claimed in claim 1, wherein: an unloading disc (11) in clearance fit with the rotor body (5) is arranged below the pump wheel B (10), a lower water lubricating bearing (12) in clearance fit with the rotor body (5) is arranged below the unloading disc (11), and an unloading disc ring (16) sleeved on the rotor body (5) is arranged above the unloading disc.

3. The coaxial integrated rotor structure of the vertical turbine feed water pump as claimed in claim 2, wherein: the lower part of the rotor body (5) is provided with a central hole, a throttling pore plate (13) is arranged in the central hole, and the central hole is communicated with a rear radial hole of the pump wheel.

4. The coaxial integrated rotor structure of the vertical turbine feed water pump as claimed in claim 3, wherein: the pump impeller comprises an A pump impeller (9) and a B pump impeller (10) located below the A pump impeller (9), and a central hole is communicated with a rear radial hole of the B pump impeller (10).

5. The coaxial integrated rotor structure of the vertical turbine feed water pump as claimed in claim 1, wherein: and a lower sealing device (8) in interference fit with the rotor body (5) is arranged between the impeller and the pump wheel.

6. The coaxial integrated rotor structure of the vertical turbine feed water pump as claimed in claim 1, wherein: the rotor body (5) is provided with a speed regulating pump wheel (2) in clearance fit with the rotor body (5) and an upper locking nut (1) which is in threaded connection with the rotor body (5) and can compress the speed regulating pump wheel (2).

7. The coaxial integrated rotor structure of the vertical steam turbine feed water pump as claimed in claim 6, wherein: and a water-feeding lubricating bearing (3) in clearance fit with the rotor body (5) is arranged above the speed-regulating pump wheel (2), and the outer side of the water-feeding lubricating bearing (3) is connected with a bearing seat (15).

8. The coaxial integrated rotor structure of the vertical steam turbine feed water pump according to claim 7, characterized in that: an upper sealing device (4) which is in interference fit with the rotor body (5) is arranged between the upper water lubricating bearing (3) and the impeller.

9. The coaxial integrated rotor structure of the vertical steam turbine feed water pump according to claim 7, characterized in that: and the inlet and the outlet of the speed regulating pump wheel (2) are respectively provided with a water pressure sensor.

Technical Field

The invention relates to the technical field of a steam turbine feed pump, in particular to a coaxial integrated rotor structure of a vertical steam turbine feed pump.

Background

In small-size turbine water-feeding pump field, require turbine water-feeding pump unit as high as possible integrated, accomplish small, light in weight, auxiliary system is simple. The small-size turbine feed water pump under the prior art condition has the condition of multi-stage connection, and the connecting piece uses a large amount, leads to small-size turbine feed water pump bulk strength relatively poor, and axial dimension is great.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a coaxial integrated rotor structure of a vertical steam turbine feed water pump, which reduces connecting pieces and shortens the axial size of a rotor.

The invention is realized by the following technical scheme: the utility model provides a coaxial integrative rotor structure of vertical turbine feed pump, includes the rotor block, sets up the impeller on the rotor block, sets up the biserial compound speed level moving blade on the impeller and sets up on the rotor block and be located the pump impeller of impeller below, pump impeller and rotor block clearance fit, the pump impeller below be provided with rotor block threaded connection's lower lock nut.

Furthermore, in order to better realize the invention, an unloading disc in clearance fit with the rotor body is arranged below the pump wheel B, a lower water lubricating bearing in clearance fit with the rotor body is arranged below the unloading disc, and an unloading disc ring sleeved on the rotor body is arranged above the unloading disc.

Furthermore, in order to better realize the invention, the lower part of the rotor body is provided with a central hole, a throttle orifice plate is arranged in the central hole, and the central hole is communicated with a rear radial hole of the pump wheel.

Further, in order to better realize the invention, the pump wheel comprises a pump wheel A and a pump wheel B positioned below the pump wheel A, and the central hole is communicated with the rear radial hole of the pump wheel B.

Further, in order to better implement the invention, a lower sealing device which is in interference fit with the rotor body is arranged between the impeller and the pump wheel.

Furthermore, in order to better realize the invention, the rotor body is provided with a speed regulating pump wheel which is in clearance fit with the rotor body and an upper locking nut which is in threaded connection with the rotor body and can press the speed regulating pump wheel.

Furthermore, in order to better realize the invention, a water-feeding lubricating bearing which is in clearance fit with the rotor body is arranged above the speed-regulating pump wheel, and the outer side of the water-feeding lubricating bearing is connected with a bearing seat.

Further, in order to better realize the invention, an upper sealing device which is in interference fit with the rotor body is arranged between the upper water lubrication bearing and the impeller.

Furthermore, in order to better realize the invention, the inlet and the outlet of the speed-regulating pump wheel are respectively provided with a water pressure sensor.

The beneficial effect that this scheme obtained is: this scheme makes steam turbine, feed pump sharing rotor, has cancelled the shaft coupling, has reduced the conventional vapor seal of steam turbine side, feed pump side packing seal or mechanical seal, can greatly reduce rotor axial dimensions, improves the holistic rigidity of rotor for rotor shafting vibration characteristic is good.

Drawings

FIG. 1 is a schematic structural diagram of the present embodiment;

FIG. 2 is a schematic structural view of a bearing seat;

FIG. 3 is a schematic view of the structure of the unloading tray;

the method comprises the following steps of 1-upper locking nut, 2-speed regulating pump impeller, 3-upper water lubricating bearing, 4-upper sealing device, 5-rotor body, 6-A moving blade, 7-B moving blade, 8-lower sealing device, 9-A pump impeller, 10-B pump impeller, 11-unloading disc, 12-lower water lubricating bearing, 13-throttling orifice plate, 14-lower locking nut, 15-bearing seat and 16-unloading disc ring.

Detailed Description

The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.

Example 1:

as shown in fig. 1, in the present embodiment, the coaxial integrated rotor structure of a vertical steam turbine feed water pump includes a rotor body 5, an impeller disposed on the rotor body 5, two-row compound speed stage moving blades disposed on the rotor body 5, and a pump impeller disposed on the rotor body 5 and located below the impeller, wherein the pump impeller is in clearance fit with the rotor body 5, and a lower lock nut 14 in threaded connection with the rotor body 5 is disposed below the pump impeller.

When the double-row compound-speed-stage moving blade works, the expanded high-speed steam drives the double-row compound-speed-stage moving blades to convert the kinetic energy of the steam into the power of the wheel circumference of the rotor body 5, so that the pump wheel on the rotor body 5 is driven to rotate, the power of the wheel circumference of the rotor body 5 is converted into the pressure energy of water supply through the rotation of the pump wheel, and the function of supplying water to a system is completed. This scheme is through making biserial compound speed level moving blade and pump impeller sharing rotor block 5, can make the torque that high-speed steam work produced directly drive the pump impeller work, reduces the use quantity of intermediate junction spare to avoid the power loss that the transmission leads to, improved power utilization. And owing to reduced the use of connecting piece, driving medium, can shorten the length of driving chain, reflect in this scheme, can shorten the length of rotor body 5 to reduce whole weight, and under satisfying the intensity requirement, can improve the rigidity of rotor body 5, increase the ability of rotor body 5 resistance to deformation, be favorable to keeping its position accuracy, shape precision, avoid long-term operation to lead to wearing and tearing and influence work efficiency, can effectively increase of service life.

In the present embodiment, the double-row counter-speed stage moving blade includes a row of a blades 6 and a row of B blades 7.

Example 2:

as shown in fig. 3, in addition to the above-mentioned embodiments, in the present embodiment, the B pump impeller 10 is provided with a unloading disc 11 which is in clearance fit with the rotor body 5 below, a lower water lubrication bearing 12 which is in clearance fit with the rotor body 5 below the unloading disc 11, and an unloading disc ring 16 which is sleeved on the rotor body 5 above.

When the unit operates under variable working conditions, the axial thrust of the rotor body 5 can change, the rotor body 5 controls the leakage amount of water passing through the gap C to change the pressure distribution on the unloading disc 11 by changing the gap C between the upper end surface of the unloading disc 11 and the plane B of the static unloading disc ring 16, so that the purpose of self-balancing of the axial thrust of the rotor is achieved, the operation stability of the unit is improved, and the position precision and the shape precision of the rotor body 5 are kept.

Through making uninstallation dish 11 and rotor body 5 clearance fit, conveniently install, dismantle, overhaul etc. operation to uninstallation dish 11.

Example 3:

on the basis of the above embodiments, in this embodiment, the lower portion of the rotor body 5 is provided with a central hole, and the central hole is internally provided with the orifice plate 13, and the central hole is communicated with the rear radial hole of the pump impeller. Part of the feed water at the outlet part of the pump wheel can be conveyed to the central hole, and then the central hole supplies water for the gap C and the lower water lubricating bearing 12, so that an additional lubricating system can be omitted, and the economical efficiency is improved.

In this embodiment, the pump impeller includes an impeller a 9 and an impeller B10 located below the impeller a 9, and the central hole communicates with a rear radial hole of the impeller B10. Therefore, the same rotor body 5 can be used for driving the two pump wheels to do work, and the power utilization rate is improved.

Example 4:

on the basis of the above embodiments, in the present embodiment, the lower sealing device 8 that is in interference fit with the rotor body 5 is disposed between the impeller and the pump wheel. In this embodiment, the lower sealing device 8 can prevent steam from leaking downwards along the rotor body 5, in this embodiment, the lower sealing device 8 is improved in surface hardness and wear resistance through a heat treatment process, and is installed on the rotor body 5 in a radially interference manner, so that the connection strength and the sealing performance of the lower sealing device 8 and the rotor body 5 are improved.

Example 5:

as shown in fig. 2, in addition to the above-described embodiments, in the present embodiment, the rotor body 5 is provided with the governor pump impeller 2 that is in clearance fit with the rotor body 5 and the upper lock nut 1 that is screwed to the rotor body 5 and can press the governor pump impeller 2. The speed regulating pump wheel 2 is used for monitoring and protecting the rotating speed of the rotor body 5, water supplied at the inlet of the water supply pump is used as a working medium, a system is protected from overspeed, and the device has the advantages of simple and reliable structure and good impact resistance.

In this embodiment, a water-feeding lubricating bearing 3 in clearance fit with the rotor body 5 is arranged above the speed-regulating pump wheel 2, and a bearing seat 15 is connected to the outer side of the water-feeding lubricating bearing 3. The speed regulating pump wheel 2 and the water feeding lubricating bearing 3 are respectively in small clearance fit with the rotor body 5 in the radial direction and are axially locked and fixed by the upper locking nut 1.

When the unit does not operate, the weight of the whole rotor is supported by the bearing seat 15 which is static in the figure 2, at the moment, the lower end face of the speed regulating pump wheel 2 is supported on the surface A of the bearing seat 15, and when the unit normally operates, the rotor floats upwards under the action of axial thrust, and the lower end face of the speed regulating pump wheel 2 is separated from the surface A of the bearing seat 15. Utilize bearing frame 15 to support speed governing pump impeller 2 for rotor block 5 is vertical structure, does not need the barring when the unit shuts down to guarantee that rotor block 5 can not the hot bending, makes unit start-up, operation, maintenance simple.

An upper sealing device 4 which is in interference fit with the rotor body 5 is arranged between the upper water lubricating bearing 3 and the impeller. The steam can be prevented from leaking upward in the axial direction by the upper seal device 4. The upper sealing device 4 also adopts a heat treatment process to improve the surface hardness and the wear resistance thereof, thereby enhancing the connection strength and the sealing performance of the upper sealing device 4 and the rotor body 5.

And the inlet and the outlet of the speed regulating pump wheel 2 are respectively provided with a water pressure sensor. In order to ensure that the rotor body 5 does not cause safety accidents due to overspeed in the operation process, the rotating speed of the rotor body 5 needs to be monitored at any time, the scheme only needs to measure the water pressure difference of the inlet and the outlet of the speed regulating pump wheel 2, the actual operation rotating speed of the rotor body 5 can be known through a rotating speed-pressure difference monotonic curve determined by a test in advance, and when the water pressure difference of the inlet and the outlet of the speed regulating pump wheel 2 exceeds a limit value, a safety protection device of a steam turbine water supply pump unit is triggered, the unit is stopped, and the safety of the rotor body.

In this embodiment, other undescribed contents are the same as those in the above embodiment, and thus are not described again.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.