WO2019174596A1 - 一种双级螺杆压缩机及压缩方法 - Google Patents

一种双级螺杆压缩机及压缩方法 Download PDF

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WO2019174596A1
WO2019174596A1 PCT/CN2019/077972 CN2019077972W WO2019174596A1 WO 2019174596 A1 WO2019174596 A1 WO 2019174596A1 CN 2019077972 W CN2019077972 W CN 2019077972W WO 2019174596 A1 WO2019174596 A1 WO 2019174596A1
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pressure stage
low
stage
pressure
screw
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PCT/CN2019/077972
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English (en)
French (fr)
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丁小川
徐晓明
俞育飞
周高明
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杭州久益机械股份有限公司
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Publication of WO2019174596A1 publication Critical patent/WO2019174596A1/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
    • 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
    • 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
    • F04C23/001—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 of similar working principle
    • 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
    • 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
    • F04C23/02—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • 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
    • F04C29/042—Heating; Cooling; Heat insulation by injecting a fluid
    • 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
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • 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
    • F01C21/007—General arrangements of parts; Frames and supporting elements

Definitions

  • the invention relates to a two-stage screw compressor and a compression method, and belongs to the technical field of compressors.
  • Compressors mainly provide raw power for industrial production, including air compressors, process compressors, refrigerant compressors, etc., which are used in industrial automation, traffic braking, energy and chemical engineering, refrigeration and air conditioning, etc., and are essential for modern industry.
  • Equipment The compressor consumes a lot of energy in the operation process and occupies a large proportion in industrial energy consumption.
  • the air compressor cost of the textile industry has already occupied about 30% of the industry cost. Therefore, the innovation and application of the compressor energy-saving technology
  • the promotion of the national energy conservation and emission reduction business and the creation of corporate profit margins are closely related, and it is a work and mission that needs long-term adherence.
  • the compressor technology is classified according to the compression principle and can be divided into screw type, piston type, slide type, centrifugal type, scroll type, etc.
  • the screw compressor is suitable for the displacement range of 100m 3 /min, with low noise and high energy efficiency.
  • the utility model has the advantages of simple structure, low operation and maintenance cost, and the like, and has been widely used in recent years.
  • Screw compressors were first invented and applied from abroad. At present, single-stage injection twin-screw compressors are widely used in the market. With the increasing emphasis on energy-saving work in recent years, the two-stage screw compressor technology has begun to be applied. However, all of them adopt the structure of traditional horizontal orientation and gear transmission, and the disclosure is a two-stage screw compressor disclosed in Chinese Patent No. CN106460843A on February 22, 2017; the publication date is 2016. On November 23, a new two-stage compressor head disclosed in Chinese Patent No. CN205714782U.
  • the technology mainly has the following disadvantages: (1) The horizontal placement of the motor requires high dynamic balance and machining accuracy of the motor rotor, gravity influence in the start-stop phase, and easy scratching with the stator housing; (2) increased gear transmission structure The mechanical loss leads to a decrease in overall energy efficiency; (3) The horizontal design is not conducive to the utilization of the compressor mainframe space.
  • the object of the present invention is to overcome the above-mentioned deficiencies in the prior art, and to provide a two-stage screw compressor and a compression method with reasonable structural design, scientific layout and convenient use, which can solve the problems existing in the existing two-stage screw compressor. .
  • the two-stage screw compressor comprises a main machine, and the structural feature thereof further comprises: a low-voltage stage driving and a high-voltage stage driving, the main body comprising a low-voltage stage housing and a high-voltage stage housing, a low-pressure stage screw for first-stage compression of a gas, an interstage passage for cooling the first-stage compressed gas, and a high-pressure stage screw for second-stage compression of the cooled gas
  • the low-pressure stage housing is provided with an intake chamber and a low-pressure stage exhaust port, the low-pressure stage screw is installed in the low-pressure stage housing, and the low-pressure stage drive is directly connected to the low-pressure stage screw;
  • There is a high-pressure inlet port and a high-pressure exhaust port the high-pressure stage screw is installed in the high-pressure stage housing, and the high-voltage stage drive is directly connected with the high-pressure stage screw;
  • the two ends of the interstage channel are respectively fixed to the low-voltage stage shell
  • the two-stage screw compressor of the present invention adopts a vertical structure, and the low-pressure stage drive and the high-pressure stage drive are both located above the main machine.
  • the drive is placed vertically. If the motor is placed vertically, the dynamic balance and machining accuracy of the motor rotor are low. There is no gravity effect during the start-stop phase, and there is no scratching with the stator housing.
  • the vertical design is beneficial to the compressor mainframe space. Use.
  • the low pressure stage drive and the high pressure stage drive of the present invention are both motors or engines.
  • the low-voltage stage driving and the high-pressure stage driving of the present invention are integrally connected with the main machine, and no transmission structure such as a coupling or a gear is disposed in the middle.
  • a compression method for a two-stage screw compressor characterized in that: the compression method is as follows: gas is sucked from the intake chamber, enters a low-pressure stage housing, is compressed by a low-pressure stage screw, and is discharged from a low-pressure stage exhaust port, into the stage.
  • the inter-channel is cooled in the interstage channel, then sucked from the high-pressure inlet, enters the high-pressure stage housing, is compressed by the high-pressure stage screw, and finally discharged from the high-pressure exhaust port to achieve two-stage gas compression.
  • the two-stage screw compressor of the present invention is used for compressed air, natural gas, freon or lithium bromide.
  • the gas of the present invention is compressed by a low-pressure stage screw, discharged from the low-pressure stage exhaust port, and cooled by the injection oil as it passes through the interstage passage; the cooling oil is sprayed and atomized through a row of injection holes.
  • the invention has the following advantages and effects: the traditional split type driving host connection mode is changed into a more convenient and safe and reliable integrated structure, the integration degree is high, the structure is simple, the disassembly and assembly is convenient; the system interface is reduced and External piping to reduce the risk of gas and water leakage; compressors can be used for air compression, and can also be used for natural gas, freon, lithium bromide and other process gas compression; vertical design is conducive to the space utilization of the compressor host; and the traditional compressor host In comparison, avoid mechanical losses caused by couplings and gear drives. It adopts dual motor drive, and the compressor adopts a vertical structure as a whole, and the drive is on the upper and the main unit is on the lower.
  • FIG. 1 is a front view showing the structure of a two-stage screw compressor in an embodiment of the present invention.
  • Fig. 2 is a left side structural view of the two-stage screw compressor in the embodiment of the present invention.
  • Fig. 3 is a cross-sectional structural view showing the plane B-B of Fig. 2;
  • low-pressure stage drive 1 high-pressure stage drive 2, main unit 3, low-pressure stage screw 4, high-pressure stage screw 5, intake chamber 6, low-pressure stage exhaust port 7, interstage passage 8, high-pressure stage intake port 9, The high pressure exhaust port 10, the low pressure stage housing 11, and the high pressure stage housing 12.
  • the two-stage screw compressor in this embodiment comprises a main machine 3, a low-pressure stage drive 1 and a high-pressure stage drive 2, which adopts a vertical structure, a low-voltage stage drive 1 and a high-voltage stage drive. 2 are located above the host 3, that is, the drive is on, and the host 3 is on.
  • the main body 3 in this embodiment includes a low-pressure stage housing 11, a high-pressure stage housing 12, a low-pressure stage screw 4 for first-stage compression of gas, and a stage for cooling the gas after the first-stage compression.
  • the low-pressure stage housing 11 is provided with an intake chamber 6 and a low-pressure stage exhaust port 7, the low-pressure stage screw 4 is installed in the low-pressure stage housing 11, and the low-voltage stage drive 1 is directly connected with the low-pressure stage screw 4, that is, the low-voltage stage drive 1 is directly connected with the low-pressure stage screw 4;
  • the high-pressure stage housing 12 is provided with a high-pressure stage inlet port 9 and a high-pressure outlet port 10, and the high-pressure stage screw 5 is installed in the high-pressure stage housing 12, the high-pressure stage drive 2 and the high-pressure stage screw 5 Direct connection, that is, the high pressure stage drive 2 is directly connected to the high pressure stage screw 5.
  • the two ends of the interstage passage 8 in this embodiment are respectively fixed on the low pressure stage housing 11 and the high pressure stage housing 12, and the two ends of the interstage passage 8 and the low pressure stage exhaust port 7 of the low pressure stage housing 11 respectively.
  • the high-pressure stage intake port 9 of the high-pressure stage housing 12 is connected, and the inter-stage passage 8 is provided with an injection hole for injecting a coolant to cool the low-pressure gas discharged from the low-pressure stage exhaust port 7.
  • Both the low-pressure stage drive 1 and the high-pressure stage drive 2 in this embodiment may be an electric motor or an engine.
  • the low-voltage stage drive 1 and the high-voltage stage drive 2 are integrally connected with the main unit 3, that is, between the low-voltage stage drive 1 and the main unit 3, and the transmission structure such as the coupling or the gear is not provided between the high-voltage stage drive 2 and the main unit 3. . Avoid mechanical losses from couplings and gearing compared to conventional compressor mainframes 3.
  • the compression method of the two-stage screw compressor in this embodiment is as follows: the gas is sucked from the intake chamber 6, enters the low-pressure stage housing 11, is compressed by the low-pressure stage screw 4, is discharged from the low-pressure stage exhaust port 7, and enters the interstage passage. 8. Cooling in the interstage passage 8, and then sucking from the high pressure stage intake port 9, entering the high pressure stage housing 12, being compressed by the high pressure stage screw 5, and finally discharged from the high pressure exhaust port 10 to achieve two-stage gas compression.
  • the two-stage screw compressor of this embodiment can be used for compressed air, natural gas, freon or lithium bromide.
  • the gas is compressed by the low-pressure stage screw 4, discharged from the low-pressure stage exhaust port 7, and is cooled by the injection oil as it passes through the interstage passage 8; the cooling oil is sprayed and atomized through a row of injection holes.
  • the traditional split-type drive host connection mode is changed into a more convenient and safe and reliable integrated structure, which has high integration, simple structure and convenient assembly and disassembly; reduces system interface and external pipelines, and reduces the risk of gas and water leakage.

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

Abstract

一种双级螺杆压缩机及压缩方法，该压缩机包括主机（3）、低压级驱动（1）和高压级驱动（2）；主机（3）包括低压级壳体（11）、高压级壳体（12）、低压级螺杆（4）、级间通道（8）和高压级螺杆（5）；低压级壳体（11）设置有进气腔（6）和低压级排气口（7），低压级螺杆（4）安装在低压级壳体（11）内，低压级驱动（1）与低压级螺杆（4）直接连接；高压级壳体（12）设置有高压级进气口（9）和高压排气口（10），高压级螺杆（5）安装在高压级壳体（12）内，高压级驱动（2）与高压级螺杆（5）直接连接；级间通道（8）的两端分别固定在低压级壳体（11）和高压级壳体（12）上，且级间通道（8）的两端分别与低压级排气口（7）和高压级进气口（9）联通，级间通道（8）设置有喷射孔。该螺杆压缩机克服了传统螺杆压缩机水平向摆置以及齿轮传动等结构导致的性能较差的问题，设计合理，布局科学，使用方便。

Description

一种双级螺杆压缩机及压缩方法 技术领域
本发明涉及一种双级螺杆压缩机及压缩方法，属于压缩机技术领域。
背景技术
压缩机主要为工业生产提供原始动力，包括空气压缩机、工艺压缩机、冷媒压缩机等，在工业自动化、交通制动、能源化工、制冷空调等等领域都有应用，是现代工业必不可少的装备。压缩机在运行过程中消耗大量能源，在工业能耗中占据很大比重，比如纺织行业空压机耗电成本已经占据行业成本的30％左右，因此压缩机高效节能技术的创新和应用，对于国家节能减排事业的推进和企业利润率的创造都息息相关，是一项需要长期坚持的工作和使命。
压缩机技术按照压缩原理分类，可以分为螺杆式、活塞式、滑片式、离心式、涡旋式等等，其中螺杆压缩机适合于100m 3/min排量范围，具有噪音低、能效高、结构简单、运维成本低等优点，近年来得到广泛应用。
螺杆压缩机最先从国外开始发明应用，目前市场上应用广泛的是单级喷油双螺杆压缩机，而随着近年来国家对节能工作的重视度提高，双级螺杆压缩机技术开始得到应用，但都是采用传统水平向摆置以及齿轮传动等结构，公开日为2017年02月22日，公开号为CN106460843A的中国专利中，公开的一种双级螺杆压缩机；公开日为2016年11月23日，公开号为CN205714782U的中国专利中，公开的一种新型双级压缩机头。目前该技术主要存在以下缺点：(1)电机水平放置，对电机转子的动平衡和加工精度要求高，启停阶段有重力影响，容易与定子壳体产生刮擦；(2)齿轮传动结构增加了机械损耗，导致整体能效下降；(3)水平设计不利于压缩机主机空间的利用。
发明内容
本发明的目的在于克服现有技术中存在的上述不足，而提供一种结构设计合理，布局科学，使用方便的双级螺杆压缩机及压缩方法，能够解决现有双级螺杆压缩机存在的问题。
本发明解决上述问题所采用的技术方案是：该双级螺杆压缩机包括主机，其结构特点在于：还包括低压级驱动和高压级驱动，所述主机包括低压级壳体，高压级壳体，用于对气体进行第一级压缩的低压级螺杆，用于对经过第一级压缩后的气体进行冷却的级间通道，以及，用于对冷却后的气体进行第二级压缩的高压级螺杆；所述低压级壳体设置有进气腔和低压级排气口，所述低压级螺杆安装在低压级壳体内，所述低压级驱动与低压级螺杆直 接连接；所述高压级壳体设置有高压级进气口和高压排气口，所述高压级螺杆安装在高压级壳体内，所述高压级驱动与高压级螺杆直接连接；所述级间通道的两端分别固定在低压级壳体和高压级壳体上，且级间通道的两端分别与低压级壳体的低压级排气口和高压级壳体的高压级进气口联通，所述级间通道设置有用于喷射冷却液以冷却从低压级排气口排出的低压气体的喷射孔。
作为优选，本发明所述双级螺杆压缩机采用竖直结构，所述低压级驱动和高压级驱动均位于主机上方。驱动竖直放置，如电机竖直放置，对电机转子的动平衡和加工精度要求低，启停阶段无重力影响，不会与定子壳体产生刮擦；且竖直设计有利于压缩机主机空间的利用。
作为优选，本发明所述低压级驱动和高压级驱动均为电机或发动机。
作为优选，本发明所述低压级驱动和高压级驱动均与主机采用一体式联接，中间不设置联轴器或齿轮等传动结构。
一种双级螺杆压缩机的压缩方法，其特点在于：所述压缩方法如下：气体从进气腔吸入，进入低压级壳体，经过低压级螺杆压缩，从低压级排气口排出，进入级间通道，在级间通道中进行冷却，再从高压级进气口吸入，进入高压级壳体，经过高压级螺杆压缩，最终从高压排气口排出，实现气体双级压缩。
作为优选，本发明所述双级螺杆压缩机用于压缩空气、天然气、氟利昂或溴化锂。
作为优选，本发明气体经过低压级螺杆压缩，从低压级排气口排出后，在经过级间通道时被喷油冷却；冷却油通过一排喷射孔喷射雾化。
本发明与现有技术相比，具有以下优点和效果：将传统分体式驱动主机连接方式改为更加方便安全可靠的一体式结构，集成度高、结构简单、拆装方便；减少了系统接口和外接管路，降低气水泄露的风险；压缩机可用于空气压缩，也可以用于天然气、氟利昂、溴化锂等工艺气体压缩；竖直的设计有利于压缩机主机的空间利用；与传统压缩机主机相比，避免联轴器和齿轮传动带来的机械损失。采用双电机驱动，同时压缩机整体采用竖直结构，驱动在上、主机在下。
附图说明
图1是本发明实施例中的双级螺杆压缩机的主视结构示意图。
图2是本发明实施例中的双级螺杆压缩机的左视结构示意图。
图3是图2中B-B面的剖视结构示意图。
图中：低压级驱动1、高压级驱动2、主机3、低压级螺杆4、高压级螺杆5、进气腔6、 低压级排气口7、级间通道8、高压级进气口9、高压排气口10、低压级壳体11、高压级壳体12。
具体实施方式
下面结合附图并通过实施例对本发明作进一步的详细说明，以下实施例是对本发明的解释而本发明并不局限于以下实施例。
实施例。
参见图1至图3，本实施例中的双级螺杆压缩机包括主机3、低压级驱动1和高压级驱动2，该双级螺杆压缩机采用竖直结构，低压级驱动1和高压级驱动2均位于主机3上方，即驱动在上、主机3在下。
本实施例中的主机3包括低压级壳体11，高压级壳体12，用于对气体进行第一级压缩的低压级螺杆4，用于对经过第一级压缩后的气体进行冷却的级间通道8，以及，用于对冷却后的气体进行第二级压缩的高压级螺杆5。其中，低压级壳体11设置有进气腔6和低压级排气口7，低压级螺杆4安装在低压级壳体11内，低压级驱动1与低压级螺杆4直接连接，即低压级驱动1与低压级螺杆4直联；高压级壳体12设置有高压级进气口9和高压排气口10，高压级螺杆5安装在高压级壳体12内，高压级驱动2与高压级螺杆5直接连接，即高压级驱动2与高压级螺杆5直联。
本实施例中的级间通道8的两端分别固定在低压级壳体11和高压级壳体12上，且级间通道8的两端分别与低压级壳体11的低压级排气口7和高压级壳体12的高压级进气口9联通，级间通道8设置有用于喷射冷却液以冷却从低压级排气口7排出的低压气体的喷射孔。
本实施例中的低压级驱动1和高压级驱动2均可以为电机或发动机。低压级驱动1和高压级驱动2均与主机3采用一体式联接，即低压级驱动1与主机3之间，以及高压级驱动2与主机3之间均不设置联轴器或齿轮等传动结构。与传统压缩机主机3相比，避免联轴器和齿轮传动带来的机械损失。
本实施例中的双级螺杆压缩机的压缩方法如下：气体从进气腔6吸入，进入低压级壳体11，经过低压级螺杆4压缩，从低压级排气口7排出，进入级间通道8，在级间通道8中进行冷却，再从高压级进气口9吸入，进入高压级壳体12，经过高压级螺杆5压缩，最终从高压排气口10排出，实现气体双级压缩。
本实施例中的双级螺杆压缩机可以用于压缩空气、天然气、氟利昂或溴化锂。气体经过低压级螺杆4压缩，从低压级排气口7排出后，在经过级间通道8时被喷油冷却；冷却 油通过一排喷射孔喷射雾化。
将传统分体式驱动主机连接方式改为更加方便安全可靠的一体式结构，集成度高、结构简单、拆装方便；减少了系统接口和外接管路，降低气水泄露的风险。
此外，需要说明的是，本说明书中所描述的具体实施例，其零、部件的形状、所取名称等可以不同，本说明书中所描述的以上内容仅仅是对本发明结构所作的举例说明。凡依据本发明专利构思所述的构造、特征及原理所做的等效变化或者简单变化，均包括于本发明专利的保护范围内。本发明所属技术领域的技术人员可以对所描述的具体实施例做各种各样的修改或补充或采用类似的方式替代，只要不偏离本发明的结构或者超越本权利要求书所定义的范围，均应属于本发明的保护范围。

Claims (7)

  1. 一种双级螺杆压缩机，包括主机，其特征在于：还包括低压级驱动和高压级驱动，所述主机包括低压级壳体，高压级壳体，用于对气体进行第一级压缩的低压级螺杆，用于对经过第一级压缩后的气体进行冷却的级间通道，以及，用于对冷却后的气体进行第二级压缩的高压级螺杆；所述低压级壳体设置有进气腔和低压级排气口，所述低压级螺杆安装在低压级壳体内，所述低压级驱动与低压级螺杆直接连接；所述高压级壳体设置有高压级进气口和高压排气口，所述高压级螺杆安装在高压级壳体内，所述高压级驱动与高压级螺杆直接连接；所述级间通道的两端分别固定在低压级壳体和高压级壳体上，且级间通道的两端分别与低压级壳体的低压级排气口和高压级壳体的高压级进气口联通，所述级间通道设置有用于喷射冷却液以冷却从低压级排气口排出的低压气体的喷射孔。
  2. 根据权利要求1所述的双级螺杆压缩机，其特征在于：所述双级螺杆压缩机采用竖直结构，所述低压级驱动和高压级驱动均位于主机上方。
  3. 根据权利要求1所述的双级螺杆压缩机，其特征在于：所述低压级驱动和高压级驱动均为电机或发动机。
  4. 根据权利要求1所述的双级螺杆压缩机，其特征在于：所述低压级驱动和高压级驱动均与主机采用一体式联接。
  5. 一种如权利要求1～4任一权利要求所述的双级螺杆压缩机的压缩方法，其特征在于：所述压缩方法如下：气体从进气腔吸入，进入低压级壳体，经过低压级螺杆压缩，从低压级排气口排出，进入级间通道，在级间通道中进行冷却，再从高压级进气口吸入，进入高压级壳体，经过高压级螺杆压缩，最终从高压排气口排出，实现气体双级压缩。
  6. 根据权利要求5所述的双级螺杆压缩机的压缩方法，其特征在于：所述双级螺杆压缩机用于压缩空气、天然气、氟利昂或溴化锂。
  7. 根据权利要求5所述的双级螺杆压缩机的压缩方法，其特征在于：气体经过低压级螺杆压缩，从低压级排气口排出后，在经过级间通道时被喷油冷却；冷却油通过一排喷射孔喷射雾化。
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