WO2012092739A1 - 具有柔性容积比滑阀的螺杆压缩机 - Google Patents

具有柔性容积比滑阀的螺杆压缩机 Download PDF

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Publication number
WO2012092739A1
WO2012092739A1 PCT/CN2011/074074 CN2011074074W WO2012092739A1 WO 2012092739 A1 WO2012092739 A1 WO 2012092739A1 CN 2011074074 W CN2011074074 W CN 2011074074W WO 2012092739 A1 WO2012092739 A1 WO 2012092739A1
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Prior art keywords
cylinder
compressor
pressure
end surface
screw
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PCT/CN2011/074074
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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
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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 US13/496,087 priority Critical patent/US20130272911A1/en
Priority to EP11844007.2A priority patent/EP2662569A4/en
Priority to IN4926DEN2012 priority patent/IN2012DN04926A/en
Publication of WO2012092739A1 publication Critical patent/WO2012092739A1/zh

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    • 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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • 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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids 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
    • F04C18/16—Rotary-piston pumps specially adapted for elastic fluids 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
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/10—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber
    • F04C28/12—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber using sliding valves

Definitions

  • the invention belongs to the technical field of compressors, and relates to a screw compressor, in particular to a screw compressor with a flexible volume ratio sliding valve. Background technique
  • the twin-screw compressor consists of a pair of parallel, intermeshing male and female screws and is the most widely used one in rotary compressors.
  • the power diagram of the screw compressor under ideal conditions is shown in Figure 1.
  • the shaded portion represents the power consumption of a cycle.
  • the pressure at the end of the compression cannot match the pressure of the exhaust gas, and it is easy to produce over-compression (delayed opening, over-compression) or under-compression (advance Open, insufficient compression).
  • Figure 2 is a diagram showing the over-compression of the screw compressor.
  • the screw compressor consumes a part of the work; in addition, the screw compressor is opened while the screw is compressed.
  • the pressure in the machine groove is higher than the pressure outside, and the noise will increase.
  • FIG. 3 is a diagram showing the under-compression of the screw compressor.
  • the screw compressor also consumes a part of the work; in addition, the screw compressor is opened while The pressure in the screw compressor groove is lower than the outside pressure, and the outside gas will enter the screw compressor, and the noise will also increase.
  • the technical problem to be solved by the present invention is to provide a screw compressor having a flexible volume ratio spool valve, which can automatically adjust the volume ratio of the compressor to an optimum state, and reduce power consumption and noise.
  • a screw compressor having a flexible volume ratio sliding valve comprising: a housing, a screw, Suction port, exhaust port, spool valve, first cylinder, second cylinder;
  • the spool valve is disposed between the first cylinder and the second cylinder;
  • the sliding valve includes a sliding valve body, and the two ends of the sliding valve body are respectively a first end surface and a second end surface, and the first end surface and the second end surface are the same as the cross-sectional area of the spool body; the first end surface and the second end surface Sealing the first cylinder and the second cylinder respectively;
  • the first cylinder is connected to the compressor exhaust port through a first connecting pipe, and the pressure generated by the first end surface corresponds to the exhaust pressure in the first cylinder; the second cylinder passes through the second connecting pipe and the last closed screw groove Connecting, in the second cylinder, the pressure generated by the second end face corresponds to the pressure at which the compressor is compressed, that is, the average pressure of the last closed groove before the compressor is exhausted;
  • the spool valve is balanced by the pressure in the first cylinder and the second cylinder to optimize the volume ratio of the compressor;
  • a screw compressor having a flexible volume ratio sliding valve the screw compressor comprising: a casing, a screw, an intake port, an exhaust port, a slide valve, a first cylinder, and a second cylinder;
  • the spool valve is disposed between the first cylinder and the second cylinder;
  • the sliding valve includes a sliding valve body, and the two ends of the sliding valve body are respectively a first end surface and a second end surface; the first end surface and the second end surface respectively seal the first cylinder and the second cylinder;
  • the first cylinder is connected to the compressor discharge port through a first connecting pipe; the second cylinder is connected to the last closed screw groove through the second connecting pipe;
  • the spool valve seeks to balance under the pressure of the first cylinder and the second cylinder.
  • the first end surface and the second end surface have the same or not the same or different cross-sectional areas as the spool body.
  • the first cylinder is connected to the compressor exhaust port through a first connecting pipe, and the pressure generated by the first end surface in the first cylinder is proportional to the exhaust pressure; the second cylinder
  • the second connecting pipe is connected to the last closed screw groove, and the pressure generated by the second end face in the second cylinder is proportional to the pressure at which the compressor is compressed, that is, the average pressure of the last closed groove before the compressor is exhausted. Just proportional.
  • the sliding valve moves toward the second cylinder, so that the pressure at the end of the compressor compression is increased; if the pressure generated by the first end surface Less than the pressure generated by the second end face, the spool moves in the direction of the first cylinder, so that the pressure at which the compressor is compressed is lowered.
  • the second cylinder is provided with an elastic mechanism, one end of the elastic mechanism is connected to the second cylinder, and the other end is connected to the second end surface; the elastic mechanism will ensure unloading start of the compressor.
  • the spool valve is disposed on one side of the screw.
  • the screw compressor is a twin screw compressor or a three rotor screw compressor.
  • the invention has the beneficial effects that: the screw compressor with flexible volume ratio sliding valve proposed by the invention can automatically adjust the volume ratio of the compressor to an optimal state, and reduce power consumption and noise.
  • the spool valve provided by the screw compressor can adjust the pressure of the first cylinder and the second cylinder according to the exhaust pressure and the pressure at which the compressor is compressed, so that the exhaust pressure and the pressure at which the compressor is compressed are matched. If the pressure generated by the first end surface is greater than the pressure generated by the second end surface, the sliding valve moves toward the second cylinder to increase the pressure at which the compressor is compressed; if the pressure generated by the first end surface is less than the pressure generated by the second end surface, The spool moves in the direction of the first cylinder, causing the pressure at the end of compression of the compressor to decrease. This ensures that the screw compressor can automatically adjust the volume ratio of the compressor under any working conditions to achieve the best volume ratio.
  • the second cylinder is provided with an elastic mechanism, so that the spool valve is always close to the first cylinder (i.e., the suction end) before starting the screw compressor, so that the volume ratio is the lowest, and the screw compressor can be started easily.
  • Figure 1 is a diagram showing the power of a screw compressor under ideal conditions.
  • Figure 2 is a diagram showing the over-compression of the screw press.
  • Figure 3 is a diagram showing the under-compression of the screw press.
  • Figure 4 is a schematic diagram of the volume change of a screw press machine in one cycle.
  • Figure 5 is a schematic view of the structure of the screw press.
  • the present invention discloses a screw compressor having a flexible volume ratio sliding valve.
  • the screw compressor includes: a housing 1, a screw 2, an air inlet, an exhaust port 6, a spool valve 3, and a first One cylinder 4 and second cylinder 5.
  • the spool valve 3 is disposed between the first cylinder 4 and the second cylinder 5. Further, the spool valve 3 may be disposed on one side of the screw 2.
  • the screw compressor is a twin-screw compressor; the present invention can of course be applied to a three-screw compressor.
  • the spool valve 3 includes a spool body 30.
  • the two ends of the spool body 30 are a first end surface 31 and a second end surface 32, respectively.
  • the cross-sectional area S l of the first end surface 31 and the cross-sectional area S2 of the second end surface 32 are the same as the cross-sectional area S3 of the spool body 30.
  • the first end surface 31 and the second end surface 32 respectively The last closed slot of the rod compressor is connected.
  • the pressure generated by the second end face 32 in the second cylinder 5 corresponds to the pressure at which the compressor is compressed, that is, the average pressure of the last closed groove before the compressor is exhausted.
  • the spool valve 3 is balanced by the driving of the first cylinder 4 and the second cylinder 5 to optimize the volume ratio of the compressor. If the pressure generated by the first end face 31 is greater than the pressure generated by the second end face 32, i.e., the exhaust pressure is greater than the end pressure of the compressor, the spool 3 is moved toward the second cylinder 5, so that the pressure at which the compressor is compressed is increased. If the pressure generated by the first end face 31 is less than the pressure generated by the second end face 32, i.e., the exhaust pressure is less than the end pressure of the compressor, the spool 3 is moved toward the first cylinder 4, so that the pressure at which the compressor is compressed is lowered.
  • a spring mechanism 35 is disposed in the second cylinder 5, and one end of the spring 35 is connected to the second cylinder 5, and the other end is connected to the second end surface 32.
  • the cross-sectional area of the first end surface and the cross-sectional area of the second end surface are the same as or not identical to or different from the cross-sectional area of the spool body.
  • the embodiment discloses a screw compressor having a flexible volume ratio sliding valve.
  • the screw compressor includes: a casing, a screw, an intake port, an exhaust port, a spool valve, a first cylinder, and a second cylinder.
  • the spool valve is disposed between the first cylinder and the second cylinder.
  • the spool valve includes a spool body. The two ends of the spool body are respectively a first end surface and a second end surface. The first end surface and the second end surface respectively seal the first cylinder and the second cylinder.
  • the first cylinder is coupled to the compressor discharge port by a first connecting pipe; the second cylinder is coupled to the last closed channel by a second connecting pipe.
  • the spool valve is balanced by the pressure in the first cylinder and the second cylinder.
  • the first cylinder is connected to the compressor exhaust port through a first connecting pipe, and the pressure generated by the first end surface is proportional to the exhaust pressure in the first cylinder; the second cylinder passes through the second connecting pipe and The last closed channel is connected, and the pressure generated by the second end face in the second cylinder is proportional to the pressure at which the compressor is compressed, that is, proportional to the average pressure of the last closed groove before the compressor is vented.
  • the screw compressor with the flexible volume ratio sliding valve proposed by the invention can automatically adjust the volume ratio of the compressor to an optimal state, and reduce power consumption and noise.
  • the spool valve provided by the screw compressor can adjust the pressure of the first cylinder and the second cylinder according to the exhaust pressure and the pressure at which the compressor is compressed, so that the exhaust pressure and the pressure at which the compressor is compressed are matched. If the pressure generated by the first end surface is greater than the pressure generated by the second end surface, the sliding valve moves toward the second cylinder to increase the pressure at which the compressor is compressed; if the pressure generated by the first end surface is less than the pressure generated by the second end surface, The spool moves in the direction of the first cylinder, causing the pressure at the end of compression of the compressor to decrease. This ensures that the screw compressor can automatically adjust the volume ratio of the compressor under any working conditions to achieve the best volume ratio.
  • the second cylinder is provided with an elastic mechanism, so that the spool valve is always close to the first cylinder (i.e., the suction end) before starting the screw compressor, so that the volume ratio is the lowest, and the screw compressor can be started easily.
  • the description and application of the present invention are intended to be illustrative, and not intended to limit the scope of the invention. Variations and modifications of the embodiments disclosed herein are possible, and various alternative and equivalent components of the embodiments are well known to those of ordinary skill in the art. It is apparent to those skilled in the art that the present invention may be embodied in other forms, configurations, arrangements, ratios, and other components, materials and components without departing from the spirit or essential characteristics of the invention. Other variations and modifications of the embodiments disclosed herein may be made without departing from the scope and spirit of the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Description

具有柔性容积比滑阀的螺杆压缩机 技术领域
本发明属于压缩机技术领域，涉及一种螺杆压缩机， 尤其涉及一种具有柔性 容积比滑阀的螺杆压缩机。 背景技术
双螺杆压缩机由一对平行、 互相啮合的阴、 阳螺杆构成， 是回转压缩机中应 用最广泛的一种。
螺杆压缩机在理想工况下的示功图如图 1所示，阴影部分表示一个循环的功 耗。 然而， 螺杆压缩机在现实工况与理想工况不同 （尤其是相差较大） 时， 压缩 终了的压力与排气压力不能匹配， 容易产生过压缩（延迟打开， 压缩过度）或欠 压缩 （提前打开， 压缩不足）。 在理想工况下， 螺杆压缩机的容积比最佳。 请参 阅图 4， 螺杆压缩机的容积比 =Vmax/V 压缩终了。
请参阅图 2， 图 2为螺杆压缩机过压缩的示功图， 在过压缩的情况下， 螺杆 压缩机多消耗了一部分功； 除此之外， 螺杆压缩机在打开的同时， 由于螺杆压缩 机螺槽内的压力较外面的压力高， 噪声会增加。
请参阅图 3， 图 3为螺杆压缩机欠压缩的示功图， 在欠压缩的情况下， 螺杆 压缩机同样会多消耗了一部分功； 除此之外， 螺杆压缩机在打开的同时， 由于螺 杆压缩机螺槽内的压力较外面的压力低， 外面的气体会进入螺杆压缩机， 噪声同 样会增加。
现有的螺杆压缩机均存在上述问题。 发明内容
本发明所要解决的技术问题是： 提供一种具有柔性容积比滑阀的螺杆压缩 机， 可使压缩机的容积比自动调节至最佳状态， 减少功耗及噪声。
为解决上述技术问题， 本发明采用如下技术方案：
一种具有柔性容积比滑阀的螺杆压缩机，所述螺杆压缩机包括：壳体、螺杆、 吸气口、 排气口、 滑阀、 第一气缸、 第二气缸；
所述滑阀设置于第一气缸、 第二气缸之间；
所述滑阀包括滑阀主体， 滑阀主体的两端分别为第一端面、第二端面， 所述 第一端面、 第二端面与滑阀主体的截面面积相同； 第一端面、第二端面分别将所 述第一气缸、 第二气缸密封；
所述第一气缸通过第一连接管与压缩机排气口连接，第一气缸内，第一端面 产生的压力对应排气压力；所述第二气缸通过第二连接管与最后一个封闭螺槽连 接， 第二气缸内， 第二端面产生的压力对应压缩机压缩终了的压力， 即压缩机排 气之前最后一个封闭螺槽的平均压力；
所述滑阀在第一气缸、第二气缸内压力的驱动下寻找平衡， 使得压缩机的容 积比最佳；
若第一端面产生的压力大于第二端面产生的压力，即排气压力大于压缩机压 缩终了的压力， 则滑阀向第二气缸方向移动， 使得压缩机压缩终了的压力提高； 若第一端面产生的压力小于第二端面产生的压力，即排气压力小于压缩机压 缩终了的压力， 则滑阀向第一气缸方向移动， 使得压缩机压缩终了的压力降低； 所述第二气缸内设有弹性机构， 弹性机构的一端连接第二气缸， 另一端连接 第二端面； 该弹性机构将保证压缩机的卸载启动。 一种具有柔性容积比滑阀的螺杆压缩机，所述螺杆压缩机包括：壳体、螺杆、 吸气口、 排气口、 滑阀、 第一气缸、 第二气缸；
所述滑阀设置于第一气缸、 第二气缸之间；
所述滑阀包括滑阀主体， 滑阀主体的两端分别为第一端面、第二端面； 第一 端面、 第二端面分别将所述第一气缸、 第二气缸密封；
所述第一气缸通过第一连接管与压缩机排气口连接；所述第二气缸通过第二 连接管与最后一个封闭螺槽连接；
所述滑阀在第一气缸、 第二气缸内压力的驱动下寻找平衡。
作为本发明的一种优选方案，所述第一端面、第二端面与滑阀主体的截面面 积相同或不全部相同或各不相同。 作为本发明的一种优选方案，所述第一气缸通过第一连接管与压缩机排气口 连接， 第一气缸内， 第一端面产生的压力与排气压力成正比； 所述第二气缸通过 第二连接管与最后一个封闭螺槽连接， 第二气缸内，第二端面产生的压力与压缩 机压缩终了的压力成正比，即与压缩机排气之前最后一个封闭螺槽的平均压力成 正比。
作为本发明的一种优选方案，若第一端面产生的压力大于第二端面产生的压 力， 则滑阀向第二气缸方向移动， 使得压缩机压缩终了的压力提高； 若第一端面 产生的压力小于第二端面产生的压力， 则滑阀向第一气缸方向移动， 使得压缩机 压缩终了的压力降低。
作为本发明的一种优选方案，所述第二气缸内设有弹性机构， 弹性机构的一 端连接第二气缸， 另一端连接第二端面； 该弹性机构将保证压缩机的卸载启动。
作为本发明的一种优选方案， 所述滑阀设置于螺杆的一侧。
作为本发明的一种优选方案，所述螺杆压缩机为双螺杆压缩机或三转子的螺 杆压缩机。 本发明的有益效果在于： 本发明提出的具有柔性容积比滑阀的螺杆压缩机， 可使压缩机的容积比自动调节至最佳状态， 减少功耗及噪声。
螺杆压缩机设置的滑阀可根据排气压力、压缩机压缩终了的压力调节第一气 缸、 第二气缸的压力， 使得排气压力、 压缩机压缩终了的压力相匹配。 若第一端 面产生的压力大于第二端面产生的压力， 则滑阀向第二气缸方向移动， 使得压缩 机压缩终了的压力提高； 若第一端面产生的压力小于第二端面产生的压力， 则滑 阀向第一气缸方向移动， 使得压缩机压缩终了的压力降低。从而保证螺杆压缩机 在任何工况下可以自动调整压缩机的容积比， 使容积比达到最佳。
此外， 第二气缸内设有弹性机构， 可以使螺杆压缩机开机启动前， 滑阀总是 靠近第一气缸 （即吸气端）， 使得容积比最低， 螺杆压缩机很容易就可以启动。 附图说明
图 1为螺杆压缩机在理想工况下的示功图。 图 2为螺杆压 ί机过压缩的示功图。
图 3为螺杆压 ί机欠压缩的示功图。
图 4为螺杆压 ί机一个循环的容积变化示意图
图 5为螺杆压 ί机的结构示意图。
附图标注如下：
1、 壳体； 2、 螺杆；
3、 滑阀； 31、 第一端面
32、 第二端面； 33、 第一连接管
34、 第二连接 35、 弹簧；
4、 第一气缸；
6、 排气口。 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 5， 本发明揭示了一种具有柔性容积比滑阀的螺杆压缩机， 所述螺 杆压缩机包括： 壳体 1、 螺杆 2、 吸气口、 排气口 6、 滑阀 3、 第一气缸 4、 第二 气缸 5。 所述滑阀 3设置于第一气缸 4、 第二气缸 5之间。 此外， 所述滑阀 3可 设置于螺杆 2的一侧。
本实施例中，所述螺杆压缩机为双螺杆压缩机； 本发明当然也可以用于三螺 杆压缩机。
所述滑阀 3包括滑阀主体 30，滑阀主体 30的两端分别为第一端面 31、第二 端面 32。 本实施例中， 所述第一端面 31的截面面积 S l、 第二端面 32的截面面 积 S2与滑阀主体 30的截面面积 S3相同。 第一端面 31、 第二端面 32分别将所 杆压缩机最后一个封闭螺槽连接， 第二气缸 5内， 第二端面 32产生的压力对应 压缩机压缩终了的压力， 即压缩机排气之前最后一个封闭螺槽的平均压力。
所述滑阀 3在第一气缸 4、 第二气缸 5的驱动下寻找平衡， 使得压缩机的容 积比最佳。若第一端面 31产生的压力大于第二端面 32产生的压力， 即排气压力 大于压缩机压缩终了的压力， 则滑阀 3向第二气缸 5方向移动， 使得压缩机压缩 终了的压力提高。若第一端面 31产生的压力小于第二端面 32产生的压力， 即排 气压力小于压缩机压缩终了的压力， 则滑阀 3向第一气缸 4方向移动， 使得压缩 机压缩终了的压力降低。
此外， 所述第二气缸 5内设有弹性机构弹簧 35， 弹簧 35的一端连接第二气 缸 5， 另一端连接第二端面 32。可以使螺杆压缩机开机启动前， 滑阀总是靠近第 一气缸 （即吸气端）， 使得容积比最低， 螺杆压缩机很容易就可以启动。 实施例二
本实施例中，所述第一端面的截面面积、第二端面的截面面积与滑阀主体的 截面面积相同或不全部相同或各不相同。
本实施例揭示一种具有柔性容积比滑阀的螺杆压缩机， 所述螺杆压缩机包 括： 壳体、 螺杆、 吸气口、 排气口、 滑阀、 第一气缸、 第二气缸。 所述滑阀设置 于第一气缸、第二气缸之间。所述滑阀包括滑阀主体， 滑阀主体的两端分别为第 一端面、 第二端面； 第一端面、 第二端面分别将所述第一气缸、 第二气缸密封。 所述第一气缸通过第一连接管与压缩机排气口连接；所述第二气缸通过第二连接 管与最后一个封闭螺槽连接。所述滑阀在第一气缸、第二气缸内压力的驱动下寻 找平衡。
优选地， 所述第一气缸通过第一连接管与压缩机排气口连接， 第一气缸内， 第一端面产生的压力与排气压力成正比；所述第二气缸通过第二连接管与最后一 个封闭螺槽连接，第二气缸内， 第二端面产生的压力与压缩机压缩终了的压力成 正比， 即与压缩机排气之前最后一个封闭螺槽的平均压力成正比。
若第一端面产生的压力大于第二端面产生的压力，则滑阀向第二气缸方向移 动， 使得压缩机压缩终了的压力提高； 若第一端面产生的压力小于第二端面产生 的压力， 则滑阀向第一气缸方向移动， 使得压缩机压缩终了的压力降低。 综上所述， 本发明提出的具有柔性容积比滑阀的螺杆压缩机， 可使压缩机的 容积比自动调节至最佳状态， 减少功耗及噪声。
螺杆压缩机设置的滑阀可根据排气压力、压缩机压缩终了的压力调节第一气 缸、 第二气缸的压力， 使得排气压力、 压缩机压缩终了的压力相匹配。 若第一端 面产生的压力大于第二端面产生的压力， 则滑阀向第二气缸方向移动， 使得压缩 机压缩终了的压力提高； 若第一端面产生的压力小于第二端面产生的压力， 则滑 阀向第一气缸方向移动， 使得压缩机压缩终了的压力降低。从而保证螺杆压缩机 在任何工况下可以自动调整压缩机的容积比， 使容积比达到最佳。
此外， 第二气缸内设有弹性机构， 可以使螺杆压缩机开机启动前， 滑阀总是 靠近第一气缸 （即吸气端）， 使得容积比最低， 螺杆压缩机很容易就可以启动。 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
、 一种具有柔性容积比滑阀的螺杆压缩机， 其特征在于， 所述螺杆压缩机包括: 壳体、 螺杆、 吸气口、 排气口、 滑阀、 第一气缸、 第二气缸；
所述滑阀设置于第一气缸、 第二气缸之间；
所述滑阀包括滑阀主体， 滑阀主体的两端分别为第一端面、 第二端面， 所述第一端面、 第二端面与气缸主体的截面面积相同； 第一端面、 第二端面 分别将所述第一气缸、 第二气缸密封；
所述第一气缸通过第一连接管与压缩机排气口连接， 第一气缸内， 第一 端面产生的压力对应排气压力； 所述第二气缸通过第二连接管与最后一个封 闭螺槽连接，第二气缸内，第二端面产生的压力对应压缩机压缩终了的压力， 即压缩机排气之前最后一个封闭螺槽的平均压力；
所述滑阀在第一气缸、 第二气缸内压力的驱动下寻找平衡， 使得压缩机 的容积比最佳；
若第一端面产生的压力大于第二端面产生的压力， 即排气压力大于压缩 机压缩终了的压力， 则滑阀向第二气缸方向移动， 使得压缩机压缩终了的压 力提高；
若第一端面产生的压力小于第二端面产生的压力， 即排气压力小于压缩 机压缩终了的压力， 则滑阀向第一气缸方向移动， 使得压缩机压缩终了的压 力降低；
所述第二气缸内设有弹性机构， 弹性机构的一端连接第二气缸， 另一端 连接第二端面； 该弹性机构将保证压缩机的卸载启动。 种具有柔性容积比滑阀的螺杆压缩机， 其特征在于， 所述螺杆压缩机包括: 体、 螺杆、 吸气口、 排气口、 滑阀、 第一气缸、 第二气缸；
所述滑阀设置于第一气缸、 第二气缸之间；
所述滑阀包括滑阀主体， 滑阀主体的两端分别为第一端面、 第二端面； 一端面、 第二端面分别将所述第一气缸、 第二气缸密封；
所述第一气缸通过第一连接管与压缩机排气口连接； 所述第二气缸通过 二连接管与最后一个封闭螺槽连接； 所述滑阀在第一气缸、 第二气缸内压力的驱动下寻找平衡。 、 根据权利要求 2所述的具有柔性容积比滑阀的螺杆压缩机， 其特征在于： 所述第一端面、 第二端面与滑阀主体的截面面积相同或不全部相同或各 不相同。 、 根据权利要求 2所述的具有柔性容积比滑阀的螺杆压缩机， 其特征在于： 所述第一气缸通过第一连接管与压缩机排气口连接， 第一气缸内， 第一 端面产生的压力与排气压力成正比；
所述第二气缸通过第二连接管与最后一个封闭螺槽连接， 第二气缸内， 第二端面产生的压力与压缩机压缩终了的压力成正比， 即与压缩机排气之前 最后一个封闭螺槽的平均压力成正比。 、 根据权利要求 2所述的具有柔性容积比滑阀的螺杆压缩机， 其特征在于： 若第一端面产生的压力大于第二端面产生的压力， 则滑阀向第二气缸方 向移动， 使得压缩机压缩终了的压力提高；
若第一端面产生的压力小于第二端面产生的压力， 则滑阀向第一气缸方 向移动， 使得压缩机压缩终了的压力降低。 、 根据权利要求 2所述的具有柔性容积比滑阀的螺杆压缩机， 其特征在于： 所述第二气缸内设有弹性机构， 弹性机构的一端连接第二气缸， 另一端 连接第二端面； 该弹性机构将保证压缩机的卸载启动。 、 根据权利要求 2所述的具有柔性容积比滑阀的螺杆压缩机， 其特征在于： 所述滑阀设置于螺杆的一侧。 、 根据权利要求 2所述的具有柔性容积比滑阀的螺杆压缩机， 其特征在于： 所述螺杆压缩机为双螺杆压缩机或三转子的螺杆压缩机。
PCT/CN2011/074074 2011-01-05 2011-05-16 具有柔性容积比滑阀的螺杆压缩机 WO2012092739A1 (zh)

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