WO2012065320A1 - 双螺杆液体泵 - Google Patents

双螺杆液体泵 Download PDF

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Publication number
WO2012065320A1
WO2012065320A1 PCT/CN2010/079291 CN2010079291W WO2012065320A1 WO 2012065320 A1 WO2012065320 A1 WO 2012065320A1 CN 2010079291 W CN2010079291 W CN 2010079291W WO 2012065320 A1 WO2012065320 A1 WO 2012065320A1
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WO
WIPO (PCT)
Prior art keywords
rotor
motor
cavity
twin
liquid pump
Prior art date
Application number
PCT/CN2010/079291
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English (en)
French (fr)
Inventor
汤炎
Original Assignee
上海维尔泰克螺杆机械有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by 上海维尔泰克螺杆机械有限公司 filed Critical 上海维尔泰克螺杆机械有限公司
Priority to EP10859796.4A priority Critical patent/EP2642125A4/en
Priority to US13/885,158 priority patent/US20130236334A1/en
Publication of WO2012065320A1 publication Critical patent/WO2012065320A1/zh

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/04—Heating; Cooling; Heat insulation
    • F04C29/045—Heating; Cooling; Heat insulation of the electric motor in hermetic pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/10—Outer members for co-operation with rotary pistons; Casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/008—Prime movers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0096—Heating; Cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C2/16—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/008—Hermetic pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0034—Sealing arrangements in rotary-piston machines or pumps for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C15/0038—Shaft sealings specially adapted for rotary-piston machines or pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings

Definitions

  • the invention belongs to the field of organic Rankine cycle technology, and relates to an organic Rankine cycle power generation system, in particular to a twin screw liquid pump of the above organic Rankine cycle power generation system. Background technique
  • Figure 1 shows a typical Organic Rankin Cycle (OCC), including expander, generator 2', evaporator 3', liquid pump 4', condenser 5'.
  • OCC Organic Rankin Cycle
  • the low temperature and low pressure liquid refrigerant is pressurized in the liquid pump 4'; then enters the evaporator 3' to be heated and vaporized until it becomes superheated gas (high temperature and high pressure), then enters the expander 1 'expanding work, driving the generator 2' Power generation.
  • the low temperature and low pressure gas after the work enters the condenser 5' is cooled and condensed into a liquid; and then returned to the liquid pump 4' to complete a cycle.
  • the drawbacks of the gear pump are: The gear pump always has one gear to drive another gear, and half of the work consumed is consumed during the drive; at the same time, in the 0RC cycle, the viscosity of the liquid is usually low and the gear is subject to wear.
  • the drawbacks of the centrifugal pump are: After the centrifugal pump draws in the liquid, the pressure during the suction process is reduced, the liquid is easily vaporized, and the efficiency of the centrifugal pump is reduced; thus affecting the efficiency of the entire 0RC cycle.
  • a drawback of the open type liquid pump is that the working fluid is easily leaked through the shaft seal. Summary of the invention
  • the technical problem to be solved by the present invention is: Providing a twin-screw liquid pump, because the resistance distance of the female rotor is small, the liquid viscosity is low, and the wear is not good, and the reliability is good.
  • a twin-screw liquid pump comprising a half-sealed or fully-sealed casing, the casing comprising a first cavity and a second cavity separated from each other; an electric motor is arranged in the first cavity, the second a main body portion of the twin screw is disposed in the cavity; at least one rotor of the twin screw is fixed to the motor rotor The twin-screw is rotated by the motor; the first cavity is provided with a liquid refrigerant injection inlet, a refrigerant outlet, and the motor is cooled by evaporation of the liquid refrigerant; the second chamber is provided with a liquid inlet and a liquid. Export.
  • the twin screw includes a male rotor and a female rotor; and the first end of the male rotor is fixedly coupled to the motor rotor.
  • the male rotor includes an integrally designed rotor portion and a connecting portion; the rotor portion is disposed in the second cavity and cooperates with the female rotor; the connecting portion extends into the first cavity
  • the first cavity and the second cavity are separated by an isolation mechanism such that a hole is formed between the first cavity and the second cavity; the connecting portion passes through the hole to In the first cavity, one end of the connecting portion away from the rotor portion is fixedly connected to the motor rotor.
  • the male rotor is disposed away from the second end of the motor and the first male rotor bearing is disposed; the two ends of the female rotor are respectively provided with a female rotor bearing.
  • the connecting portion is provided with a second male rotor bearing between the rotor portion of the male rotor and the motor rotor.
  • the connecting portion and the second male rotor bearing are sealed by a shaft seal near the rotor end of the motor.
  • the motor is a variable frequency motor or a fixed speed motor.
  • the invention has the beneficial effects of: the twin-screw liquid pump for the organic Rankine cycle proposed by the invention, the liquid pump has no resistance to wear when the viscosity of the liquid is low, and the reliability is good; The power generation efficiency of the organic Rankine cycle.
  • the semi-sealed or fully sealed housing can effectively prevent leakage of working fluid.
  • Figure 1 is a schematic diagram showing the composition of an organic Rankine cycle power generation system.
  • 2 is a schematic view showing the composition of an organic Rankine cycle power generation system using the present invention.
  • Figure 3 is a cross-sectional view of the twin-screw liquid pump of the present invention in a vertical direction.
  • Figure 4 is a cross-sectional view of the twin-screw liquid pump of the present invention in a horizontal direction.
  • Female rotor bearing 406 Sealing ring
  • Refrigerant medium injection inlet 410 Refrigerant medium outlet
  • Fig. 2 shows an organic Rankine cycle power generation system using the present invention.
  • the organic Rankine cycle power generation system includes a condenser 5, a liquid pump 4, an evaporator 3, an expander 1, and a generator 2.
  • the improvement of the present invention is mainly in the liquid pump 4, and in the present embodiment, the liquid pump 4 is a twin-screw liquid pump 4.
  • the twin-screw liquid pump 4 includes a half-sealed or fully-sealed casing, and the casing is composed of a plurality of components, and a seal ring 406 is disposed at a gap of each component.
  • the housing includes a first cavity that is isolated from each other Body, second cavity.
  • a motor 401 is disposed in the first cavity, and a main body portion of the twin screw is disposed in the second cavity; at least one rotor of the twin screw is fixedly coupled to the motor rotor, and the twin screw is rotated by the motor 401.
  • the power source of the electric motor 401 can be from the electrical energy emitted by the organic Rankine cycle power generation system.
  • the first cavity is provided with a liquid refrigerant injection port 409 and a refrigerant outlet 410, and the motor 401 is cooled by evaporation of a liquid refrigerant.
  • the second chamber is provided with a liquid inlet 407 and a liquid outlet 408.
  • the motor may be a variable frequency motor or a fixed speed motor, and may of course be a conventional motor.
  • the twin-screw liquid pump includes a male rotor 402 and a female rotor 403; a first end of the male rotor 402 is fixedly coupled to the motor 401 rotor.
  • the male rotor 402 includes an integrally designed rotor portion, a connecting portion; the illustrated rotor portion is disposed within the second cavity and mates with the female rotor 403; the connecting portion extends into the interior of the motor 401 in the first cavity.
  • the first cavity and the second cavity are separated by an isolation mechanism, such that a hole is formed between the first cavity and the second cavity, and the connecting portion passes through the hole into the first cavity.
  • One end of the connecting portion away from the rotor portion is fixedly coupled to the rotor of the motor 401.
  • the male rotor 402 is disposed away from the second end of the motor 401 to the first male rotor bearing 4041; the female rotor 403 is provided with a female rotor bearing 405 at both ends thereof.
  • the connecting portion is provided with a second male rotor bearing 4042 between the rotor portion of the male rotor and the motor rotor.
  • the connecting portion and the second male rotor bearing 4042 are sealed by a shaft seal 411 near the rotor end of the motor.
  • the present invention proposes a full-sealed or semi-sealed twin-screw liquid pump that can be used in an organic Rankine cycle power generation system.
  • the liquid pump does not wear when the liquid rotor has a low viscosity, and the reliability is low. Good; thus, the power generation efficiency of the organic Rankine cycle can be improved.
  • the semi-sealed or fully sealed housing can effectively prevent leakage of working fluid.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Description

双螺杆液体泵 技术领域
本发明属于有机朗肯循环技术领域， 涉及一种有机朗肯循环发电系统， 尤其涉及上述有机朗肯循环发电系统的双螺杆液体泵。 背景技术
请参阅图 1， 图 1为一个典型的有机朗肯循环 （Organic Rankin Cycle, 0RC), 包括膨胀机 、 发电机 2' 、 蒸发器 3' 、 液体泵 4' 、 冷凝器 5' 。
低温低压的液体制冷工质在液体泵 4' 中被升压； 然后进入蒸发器 3 ' 被 加热汽化， 直至成为过热气体（高温高压）后， 进入膨胀机 1 ' 膨胀做功， 驱 动发电机 2 ' 发电。做功后的低温低压气体进入冷凝器 5' 被冷却凝结成液体； 再回到液体泵 4' 中， 完成一个循环。
现有的液体泵多为开启式的齿轮泵或离心泵。 齿轮泵的缺陷在于： 齿轮 泵中总是一个齿轮驱动另外一个齿轮， 消耗的功有一半消耗在驱动过程中； 同时， 0RC循环中， 液体的粘度通常较低， 齿轮易磨损。 离心泵的缺陷在于： 离心泵将液体吸入后， 吸入过程中压力降低， 液体易汽化， 导致离心泵的效 率降低； 从而影响整个 0RC循环的效率。 开启式的液体泵的缺陷在于， 工质 容易通过轴封泄露。 发明内容
本发明所要解决的技术问题是： 提供一种双螺杆液体泵， 由于阴转子阻 力距很小， 液体粘度很低时也不会磨损， 可靠性好。
为解决上述技术问题， 本发明采用如下技术方案：
一种双螺杆液体泵， 所述双螺杆液体泵包括半封或全封的壳体， 壳体包 括相互隔离的第一腔体、 第二腔体； 所述第一腔体内设置电动机， 第二腔体 内设置双螺杆的主体部分； 所述双螺杆的至少一个转子与电动机转子固定连 接， 双螺杆通过电动机的带动转动； 所述第一腔体设置液态制冷工质喷入口、 制冷工质出口， 通过液态制冷工质的蒸发冷却电动机； 所述第二腔体设置液 体入口、 液体出口。
作为本发明的一种优选方案， 所述双螺杆包括阳转子、 阴转子； 所述阳 转子的第一端与所述电动机转子固定连接。
作为本发明的一种优选方案， 所述阳转子包括一体化设计的转子部分、 连接部分； 所示转子部分设置于第二腔体内、 与阴转子配合； 所述连接部分 伸入第一腔体中的电动机内部； 所述第一腔体、 第二腔体通过一隔离机构相 隔开， 使得第一腔体、 第二腔体之间形成一孔洞，； 所述连接部分穿过该孔洞 至第一腔体内， 连接部分远离转子部分的一端与电动机转子固定连接。
作为本发明的一种优选方案， 所述阳转子远离电动机的第二端设置第一 阳转子轴承； 所述阴转子的两端分别设置阴转子轴承。
作为本发明的一种优选方案， 所述连接部分在阳转子的转子部分和电动 机转子之间设置第二阳转子轴承。
作为本发明的一种优选方案， 所述连接部分与第二阳转子轴承靠近电动 机转子端通过轴封密封。
作为本发明的一种优选方案， 所述电动机为变频电动机或固定转速的电 动机。
本发明的有益效果在于： 本发明提出的用于有机朗肯循环的双螺杆液体 泵， 液体泵由于阴转子阻力距很小， 液体粘度很低时也不会磨损， 可靠性好； 从而可以提高有机朗肯循环的发电效率。 此外， 半封或全封的壳体可以有效 地防止工质的泄露。 附图说明
图 1为有机朗肯循环发电系统的组成示意图。 图 2为使用本发明的有机朗肯循环发电系统的组成示意图。
图 3为本发明双螺杆液体泵垂直方向的剖视图。
图 4为本发明双螺杆液体泵水平方向的剖视图。
附图主要组件符号说明如下：
1 ' ： 膨胀机 发电机
3， ：
Figure imgf000005_0001
液体泵
5 ' ： 冷凝器
1： 膨胀机 2： 发电机
3： 蒸发器 4： 液体泵
5： 冷凝器 401： 电动机
402： 阳转子 403： 阴转子
4041： 第一阳转子轴承 4042： 第二阳转子轴承
405： 阴转子轴承 406： 密封圈
407： 液体入口 408： 液体出口
409： 制冷工质喷入口 410： 制冷工质出口
411： 轴封
具体实施方式
下面结合附图详细说明本发明的优选实施例。
实施例一
请参阅图 2， 图 2表示了使用本发明的有机朗肯循环发电系统， 所述有机 朗肯循环发电系统包括冷凝器 5、 液体泵 4、 蒸发器 3、 膨胀机 1、 发电机 2。 本发明的改进主要在于其液体泵 4，本实施例中，液体泵 4为双螺杆液体泵 4。
请参阅图 3、 图 4， 所述双螺杆液体泵 4包括半封或全封的壳体， 壳体由 多个部件组成， 各部件的间隙处设置密封圈 406。壳体包括相互隔离的第一腔 体、第二腔体。所述第一腔体内设置电动机 401， 第二腔体内设置双螺杆的主 体部分； 所述双螺杆的至少一个转子与电动机转子固定连接， 双螺杆通过电 动机 401的带动转动。 电动机 401的动力源可以来自所述有机朗肯循环发电 系统发出的电能。所述第一腔体设置液态制冷工质喷入口 409、制冷工质出口 410， 通过液态制冷工质的蒸发冷却电动机 401 ; 所述第二腔体设置液体入口 407、 液体出口 408。 所述电动机可以为变频电动机或固定转速的电动机， 当 然也可以是普通的电动机。
所述双螺杆液体泵包括阳转子 402、 阴转子 403; 所述阳转子 402的第一 端与所述电动机 401转子固定连接。 所述阳转子 402包括一体化设计的转子 部分、 连接部分； 所示转子部分设置于第二腔体内、 与阴转子 403配合； 所 述连接部分伸入第一腔体中的电动机 401 内部。 所述第一腔体、 第二腔体通 过一隔离机构相隔开， 使得第一腔体、 第二腔体之间形成一孔洞，； 所述连接 部分穿过该孔洞至第一腔体内， 连接部分远离转子部分的一端与电动机 401 转子固定连接。
所述阳转子 402远离电动机 401的第二端设置第一阳转子轴承 4041 ; 所 述阴转子 403的两端分别设置阴转子轴承 405。所述连接部分在阳转子的转子 部分和电动机转子之间设置第二阳转子轴承 4042。 所述连接部分与第二阳转 子轴承 4042靠近电动机转子端通过轴封 411密封。 综上所述， 本发明提出的可用于有机朗肯循环发电系统的全封或半封双 螺杆液体泵， 液体泵由于阴转子阻力距很小， 液体粘度很低时也不会磨损， 可靠性好； 从而可以提高有机朗肯循环的发电效率。 此外， 半封或全封的壳 体可以有效地防止工质的泄露。 这里本发明的描述和应用是说明性的， 并非想将本发明的范围限制在上 述实施例中。 这里所披露的实施例的变形和改变是可能的， 对于那些本领域 的普通技术人员来说实施例的替换和等效的各种部件是公知的。 本领域技术 人员应该清楚的是， 在不脱离本发明的精神或本质特征的情况下， 本发明可 以以其它形式、 结构、 布置、 比例， 以及用其它组件、 材料和部件来实现。 在不脱离本发明范围和精神的情况下， 可以对这里所披露的实施例进行其它 变形和改变。

Claims

权利 要 求书 、 一种双螺杆液体泵， 其特征在于， 所述双螺杆液体泵包括半封或全封的壳 体， 壳体包括相互隔离的第一腔体、 第二腔体；
所述第一腔体内设置电动机， 第二腔体内设置双螺杆的主体部分； 所述双螺杆的至少一个转子与电动机转子固定连接，双螺杆通过电动 机的带动转动；
所述第一腔体设置液态制冷工质喷入口、制冷工质出口， 通过液态制 冷工质的蒸发冷却电动机；
所述第二腔体设置液体入口、 液体出口。 、 根据权利要求 1所述的双螺杆液体泵， 其特征在于：
所述双螺杆包括阳转子、 阴转子； 所述阳转子的第一端与所述电动机 转子固定连接。 、 根据权利要求 2所述的双螺杆液体泵， 其特征在于：
所述阳转子包括一体化设计的转子部分、 连接部分；
所示转子部分设置于第二腔体内、 与阴转子配合； 所述连接部分伸入 第一腔体中的电动机内部；
所述第一腔体、 第二腔体通过一隔离机构相隔开， 使得第一腔体、 第 二腔体之间形成一孔洞； 所述连接部分穿过该孔洞至第一腔体内， 连接部 分远离转子部分的一端与电动机转子固定连接。 、 根据权利要求 3所述的双螺杆液体泵， 其特征在于：
所述阳转子远离电动机的第二端设置第一阳转子轴承；所述阴转子的 两端分别设置阴转子轴承。 、 根据权利要求 4所述的双螺杆液体泵， 其特征在于： 所述连接部分在阳转子的转子部分和电动机转子之间设置第二阳转 子轴承。 、 根据权利要求 5所述的双螺杆液体泵， 其特征在于：
所述连接部分与第二阳转子轴承靠近电动机转子端通过轴封密封。 、 根据权利要求 1所述的双螺杆液体泵， 其特征在于：
所述电动机为变频电动机或固定转速的电动机。
PCT/CN2010/079291 2010-11-16 2010-11-30 双螺杆液体泵 WO2012065320A1 (zh)

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