WO2020233244A1 - 螺杆泵 - Google Patents

螺杆泵 Download PDF

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Publication number
WO2020233244A1
WO2020233244A1 PCT/CN2020/082493 CN2020082493W WO2020233244A1 WO 2020233244 A1 WO2020233244 A1 WO 2020233244A1 CN 2020082493 W CN2020082493 W CN 2020082493W WO 2020233244 A1 WO2020233244 A1 WO 2020233244A1
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WO
WIPO (PCT)
Prior art keywords
stator
rotor
joint
suction chamber
discharge chamber
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Application number
PCT/CN2020/082493
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English (en)
French (fr)
Inventor
孙秋云
Original Assignee
南京彩云机械电子制造集团有限公司
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Application filed by 南京彩云机械电子制造集团有限公司 filed Critical 南京彩云机械电子制造集团有限公司
Publication of WO2020233244A1 publication Critical patent/WO2020233244A1/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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • 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
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
    • 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
    • F04C2240/10—Stators
    • 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
    • F04C2240/20—Rotors

Definitions

  • the invention relates to a screw pump.
  • the screw pump is one of the commonly used tools, especially the single screw pump. Its main working parts are the screw of the eccentric spiral body (called the rotor) and the screw bush (called the stator) with the inner surface of the double helix surface. Its working principle is that when the motor drives the pump shaft to rotate, the screw on the one hand rotates around its own axis, on the other hand it rolls along the inner surface of the bushing, thus forming a sealed chamber of the pump. Each time the screw rotates, the liquid in the sealed cavity advances by a pitch. With the continuous rotation of the screw, the liquid spirally presses from one sealed cavity to another, and finally extrudes the pump body.
  • the diameters of the stator and the rotor are uniform, that is, the diameter of any radial section is equal.
  • the stator is mostly made of rubber, which is easier to wear compared to the metal rotor.
  • the use cost of the screw pump is high.
  • the service life of the rotor of the screw pump is generally about 1600 hours, and the service life of the stator is generally about 800 hours.
  • the service life of the entire screw pump is about 800 hours, and the service life of the screw pump is relatively short.
  • the purpose of the present invention is to provide a screw pump, which solves the technical defect that the rotor used in the screw pump wears out and the stator used in the screw pump in the prior art causes the short service life of the screw pump.
  • a screw pump including a suction chamber, a discharge chamber, a rotor, a stator, and a transmission shaft.
  • the stator includes a rotor body and a joint, and the joint and the rotor body The diameter of the rotor body is eccentrically arranged and the two are an integrated structure. The diameter of the rotor body gradually changes from the end used for connection with the joint to the end far away from the joint; the stator includes a stator body and a stator jacket. The body is arranged in the stator jacket and is fixed to the stator jacket.
  • the stator body is provided with a stator spiral hole for installing the rotor along its length.
  • the rotor body extends into the stator spiral hole, and the stator spiral
  • the cross section of the hole is oblong, and the diameter of the arc part of the stator spiral hole section gradually changes from one end to the other end of the stator body.
  • the length of the straight part of the stator spiral hole section is from one end to the other end of the stator body Gradually from large to small, the stator spiral hole is matched with the rotor body; the joint is connected to the drive shaft through the first universal joint, and the other end of the drive shaft is used to drive the rotor through the second universal joint.
  • the driving motor rotating in the stator is connected, the discharge chamber and the suction chamber are respectively detachably installed at both ends of the stator, and the first universal joint, the second universal joint and the transmission shaft are all located in the suction chamber.
  • the rotor in the present invention can move slightly along the length of the stator when the stator is worn, so as to ensure that the rotor and the stator spiral hole on the stator fit together, instead of directly replacing the stator as in the prior art, compared with the prior art
  • the middle stator is replaced when it is worn out.
  • the invention prolongs the use time of the stator, reduces the cost of replacing the stator, and reduces the use cost of the screw pump.
  • the suction chamber and the discharge chamber are connected by two or more tie rods, and the tie rods generate tension on the suction chamber and the discharge chamber in opposite directions, clamping the stator in the suction chamber and the discharge chamber. Between rooms.
  • the invention pulls the suction chamber and the discharge chamber toward each other through the connecting rod, so that the two are connected with the stator, and the connection structure of the whole screw pump is simple.
  • a first stator bayonet is opened on the end of the discharge chamber close to the suction chamber
  • a second stator bayonet is opened on the end of the suction chamber close to the discharge chamber
  • the stator The two ends of the two respectively extend into the first stator bayonet and the second stator bayonet.
  • the discharge chamber is uniformly provided with first fixing protrusions in the same number as the number of pull rods along its circumferential direction, and the first fixing protrusions are opened along the length direction of the stator.
  • first fixing through hole for fixing the pull rod the suction chamber is evenly provided with second fixing protrusions in the same number as the number of the pull rods along the circumferential direction of the suction chamber, and the second fixing protrusions are arranged along the stator
  • a second fixing through hole for fixing the pull rod is opened in the length direction of the.
  • the beneficial effects of the present invention are: the present invention has a long service life and reduces the use cost of the present invention.
  • Fig. 1 is a schematic diagram reflecting the structure of a rotor for a screw pump in the present invention.
  • Fig. 2 is a cross-sectional view taken along the line A-A in Fig. 1.
  • Fig. 3 is a B-B sectional view of Fig. 1.
  • Fig. 4 is a schematic diagram reflecting the structure of the stator for the screw pump in the present invention.
  • Fig. 5 is a cross-sectional view taken along line C-C in Fig. 4.
  • Fig. 6 is an E-E cross-sectional view of Fig. 4.
  • Fig. 7 is a schematic diagram of the structure of the present invention.
  • stator body 22. The stator jacket; 23. The stator spiral hole.
  • Figures 1 to 3 show the rotor of the present invention, which includes a rotor body 11 and a joint 12, and the cross-sections of the rotor body 11 and the joint 12 perpendicular to the longitudinal direction thereof are all circular, wherein the joint 12
  • the diameter is slightly smaller than the diameter of the rotor body 11.
  • the joint 12 and the rotor body 11 are eccentrically arranged and the two are an integrated structure.
  • the joint 12 and the rotor body 11 can be made separately and then fixed by means such as welding, or It is manufactured in an integrated manner.
  • the present invention uses a cylindrical metal rod to be manufactured in one piece.
  • the diameter of the rotor body 11 is gradually changed from the end connected to the joint 12 to the end away from the joint 12.
  • the diameter of the end of the rotor body 11 used to connect with the joint 12 in the present invention is D1
  • the diameter of the end of the rotor body 11 away from the joint 12 is D2, where D1>D2, the preferred D1 of the present invention is omitted Greater than D2.
  • a rounded corner 13 is preferably provided at one end of the rotor body 11 away from the joint 12.
  • the stator used in the present invention shown in FIGS. 4 to 6 includes a stator body 21 and a stator casing 22.
  • the stator body 21 is arranged in the stator casing 22 and is fixed to the stator casing 22.
  • the stator body A stator spiral hole 23 for installing the rotor is opened on 21 along its length.
  • the section of the stator spiral hole 23 is oblong.
  • the pitch of the stator spiral hole 23 is constant and the pitch of the stator spiral hole 23 is consistent with the installation.
  • the pitch of the rotor body 11 is equal, and the rotor body 11 extends into the stator spiral hole 23, and the diameter of the arc part of the stator spiral hole 23 is gradually changed from one end of the stator body 21 to the other end.
  • the length of the straight portion of the section of the stator spiral hole 23 gradually changes from one end to the other end of the stator body 21, so that the stator spiral hole 23 matches the rotor body 11;
  • the diameter of the arc part of the cross section is D3, and the diameter of the arc part of the cross section at the other end is D4, where D3>D4.
  • D3 in the present invention is only slightly larger than D4, and the length of the stator body 21 in this embodiment is less than The length of the rotor body 11.
  • the stator jacket 22 is a steel jacket
  • the rotor body 11 is made of rubber (nitrile rubber), and the rotor body 11 is cast in the steel jacket.
  • Figure 7 shows the screw pump of the present invention, including a suction chamber 31, a discharge chamber 32, a rotor as shown in Fig. 1, a stator and a transmission shaft 33 as shown in Fig. 2, and the discharge chamber 32 includes a discharge chamber
  • the main body of the discharge chamber is provided with discharge through holes 311 penetrating both ends along the length direction of the rotor body 11.
  • the cross section of the discharge through holes 311 is circular.
  • the discharge chamber 32 and the screw pump After the stator is connected, the stator spiral hole 23 of the stator body 21 communicates with the discharge through hole 311.
  • the suction chamber 31 includes a suction chamber body.
  • the suction chamber body is provided with a suction cavity along the length of the stator body 21. 312.
  • the suction chamber is provided with a suction port 313 for fluid to enter the suction chamber along a direction perpendicular to the length of the stator body 21. It is delivered to the discharge port 314 in the stator body 21, one end of the stator for the screw pump is connected to the suction chamber 31 through the discharge port 314, and the stator spiral hole 23 on the stator body communicates with the suction cavity 312.
  • the rotor body 11 is set in In the stator body 21, the joint 12 is connected to the transmission shaft 33 through the first universal joint 34, and the other end of the transmission shaft 33 is used to connect with the rotor for driving the screw pump through the second universal joint 35.
  • the driving motor (not shown in the figure) rotating in the stator of the pump is connected, the discharge chamber 32 and the suction chamber 31 are respectively detachably installed at both ends of the stator of the screw pump, and the first universal The joint 34, the second universal joint 35 and the transmission shaft 33 are all located in the suction chamber 31.
  • the transmission shaft 33 in the present invention adopts a telescopic transmission shaft, such as the transmission shaft disclosed in the Chinese invention patent application No. 201710329545.0.
  • the suction chamber 31 and the discharge chamber 32 are connected by two or more tie rods 36, and the tie rods 36 generate a tensile force on the suction chamber 31 and the discharge chamber 32 in opposite directions, and the stator of the screw pump It is clamped between the suction chamber 31 and the discharge chamber 32.
  • the discharge chamber body has a first stator bayonet 37 at the end close to the suction chamber 31, and the suction chamber 31 has a second stator bayonet 38 at the end close to the discharge chamber 32. Both ends of the stator for the screw pump described above extend into the first stator bayonet 37 and the second stator bayonet 38 respectively.
  • the discharge chamber 32 is uniformly provided with first fixing protrusions 39 in the same number as the number of tie rods 36 along its circumferential direction, and the first fixing protrusions 39 are opened along the length direction of the stator of the screw pump.
  • the suction chamber 31 is uniformly provided with second fixing protrusions 310 in the same number as the number of the pull rods 36 along its circumferential direction.
  • the second fixing protrusions A second fixing through hole for fixing the tie rod 36 is opened along the length direction of the stator for the screw pump 310.
  • the first fixed through hole and the second fixed through hole are both smooth through holes, both ends of the pull rod 36 are provided with threads, and the first fixing protrusion 39 is far away from the A first connecting nut and a second connecting nut are respectively provided on one side of the second fixing protrusion 310 and the side of the second fixing protrusion 310 away from the first fixing protrusion 39, and both ends of the pull rod 36 pass through the first connecting nut.
  • first fixing through hole and the second fixing through hole may also be threaded holes.
  • the two ends of the pull rod 36 are respectively provided with threads with opposite rotation directions. It is threadedly connected with the first fixed through hole and the second fixed through hole, and a connecting part is provided in the middle of the tie rod 36.
  • the cross-sectional shape of the connecting part along the radial direction of the screw is polygonal to facilitate the tie rod 36 Rotate.
  • the life of the stator body 21 is about 800 hours, while the life of the rotor body 11 is about 1600 hours.
  • the conventional screw pump is used for about 800 hours, the stator body is worn out, its sealing performance is reduced, and it is difficult to maintain the proper pressure.
  • the use time of the stator body 11 and the rotor body 21 can be basically realized.
  • the service life of the screw pump of the present invention is increased to about 1600 hours.
  • the overall service life of the pump reduces the use cost of the present invention.

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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)

Abstract

一种螺杆泵，包括吸入室（31）、排出室（32）、转子、定子和传动轴（33），转子包括转子本体（11）和接头（12），转子本体（11）的直径自用于与接头（12）连接的一端向远离接头（12）的一端由大向小渐变；定子包括定子本体（21）和定子外套（22），定子本体（21）上沿其长度方向开有用于安装转子的定子螺旋孔（23），定子螺旋孔（23）的直径从一端向另一端由大向小渐变；接头（12）通过第一万向节（34）与传动轴（33）连接，传动轴（33）的另一端通过第二万向节（35）用于与驱动转子在定子内转动的驱动电机连接，排出室（32）和吸入室（31）分别可拆卸的安装在定子的两端，第一万向节（34）、第二万向节（35）和传动轴（33）均位于吸入室内。该螺杆泵使用寿命长，降低了使用成本。

Description

螺杆泵 技术领域
本发明涉及一种螺杆泵。
背景技术
螺杆泵是常用的工具之一，尤其中单螺杆泵，其主要工作部件是偏心螺旋体的螺杆(称转子)和内表面呈双线螺旋面的螺杆衬套(称定子)。其工作原理是当电动机带动泵轴转动时，螺杆一方面绕本身的轴线旋转，另一方面它又沿衬套内表面滚动，于是形成泵的密封腔室。螺杆每转一周，密封腔内的液体向前推进一个螺距，随着螺杆的连续转动，液体螺旋形方式从一个密封腔压向另一个密封腔，最后挤出泵体，现有的螺杆泵的定子和转子的直径是均匀的，即任一径向截面的直径均相等，在使用时，定子与转子相对转动，定子多采用橡胶材质，相对于金属材质的转子更易磨损，而定子磨损后即要更换，造成螺杆泵的使用成本较高，如螺杆泵的转子的使用寿命一般在1600小时左右，定子的使用寿命一般在800小时左右，在使用800小时左右时，定子内表面磨损即需要更换，实际上整个螺杆泵的使用寿命也就800小时左右，螺杆泵的使用寿命较短。
发明内容
本发明的目的是提供一种螺杆泵，解决现有技术中螺杆泵用的转子磨损螺杆泵用的定子导致螺杆泵使用寿命短的技术缺陷。
为解决上述问题，本发明所采取的技术方案是：一种螺杆泵，包括吸入室、排出室、转子、定子和传动轴，所述的定子包括转子本体和接头，所述的接头与转子本体偏心设置并且两者为一体式结构，所述的转子本体的直径自用于与接头连接的一端向远离接头的一端由大向小渐变；所述的定子包括定子本体和定子外套，所述的定子本体设置在定子外套内并且与定子外套相固定，所述的定子本体上沿其长度方向开有用于安装转子的定子螺旋孔，所述的转子本体伸入定子螺旋孔内，所述的定子螺旋孔的截面为长圆形，并且定子螺旋孔截面的圆弧部分的直径从定子本体的一端向另一端由大向小渐变，定子螺旋孔截面的直线部分的长度从定子本体的一端 向另一端由大向小渐变，使定子螺旋孔与转子本体相配合；所述的接头通过第一万向节与传动轴连接，所述的传动轴的另一端通过第二万向节用于与驱动转子在定子内转动的驱动电机连接，所述的排出室和吸入室分别可拆卸的安装在定子的两端，所述的第一万向节、第二万向节和传动轴均位于吸入室内。本发明中的转子可在定子磨损时沿着定子的长度方向做稍许的移动，确保转子与定子上的定子螺旋孔贴合，而非如现有技术一样直接更换定子，相较于现有技术中定子磨损即更换，本发明延长了定子的使用时间，减少了更换定子而产生的费用，降低了螺杆泵的使用成本。
作为本发明的进一步改进，所述的吸入室和排出室通过两根以上的拉杆连接，所述的拉杆朝着相向的方向对吸入室和排出室产生拉力，将定子夹紧在吸入室和排出室之间。本发明通过接杆将吸入室和排出室相向拉动，使两者与定子连接，整个螺杆泵的连接结构简单。
作为本发明的进一步改进，所述的排出室上靠近吸入室的一端开有第一定子卡口，所述的吸入室上靠近排出室的一端开有第二定子卡口，所述的定子的两端分别伸入第一定子卡口和第二定子卡口内。本申请通过开设第一定子卡口和第二定子卡口，可对定子的两端进行定位，方便安装，同时也提高本发明的密封性。
作为本发明的更进一步改进，所述的排出室上沿其圆周方向均匀的设有数量与拉杆的数量相等的第一固定凸起，所述的第一固定凸起沿着定子的长度方向开有用于固定拉杆的第一固定通孔，所述的吸入室上沿其圆周方向均匀的设有数量与拉杆的数量相等的第二固定凸起，所述的第二固定凸起上沿着定子的长度方向开有用于固定拉杆的第二固定通孔。
综上所述，本发明的有益效果是：本发明的使用寿命长，降低了本发明的使用成本。
附图说明
图1是反映本发明中螺杆泵用转子的结构示意图。
图2是图1的A-A剖视图。
图3是图1的B-B剖视图。
图4是反映本发明中螺杆泵用定子的结构示意图。
图5是图4的C-C剖视图。
图6是图4的E-E剖视图。
图7是本发明的结构示意图。
其中：11、转子本体；12、接头；13、倒圆角。
21、定子本体；22、定子外套；23、定子螺旋孔。
31、吸入室；32、排出室；33、转动轴；34、第一万向节；35、第二万向节；36、拉杆；37、第一定子卡口；38、第二定子卡口；39、第一固定凸起；310、第二固定凸起；311、排出通孔；312、吸入腔；313、吸入口；314、排出口。
具体实施方式
下面结合附图对本发明的具体实施方式做进一步的说明。
图1～图3所示的是本发明中的转子，其包括转子本体11和接头12，所述的转子本体11和接头12与其长度方向垂直的截面均为圆形，其中所述的接头12的直径略小于转子本体11的直径，所述的接头12与转子本体11偏心设置并且两者为一体式结构，其中接头12与转子本体11可单独制作再采用诸如焊接的方式相固定，也可采用一体制造的方式制成，本发明采用一根柱状的金属杆一体加工制成，所述的转子本体11的直径自用于与接头12连接的一端向远离接头12的一端由大向小渐变。如图1所示，本发明中转子本体11用于与接头12相接的一端的直径为D1，转子本体11远离接头12的一端的直径为D2，其中D1＞D2，本发明优选的D1略大于D2。
本实施例优选的在所述的转子本体11远离接头12的一端设置有倒圆角13。
图4～图6所示的用于本发明中的定子，包括定子本体21和定子外套22，所述的定子本体21设置在定子外套22内并且与定子外套22相固定，所述的定子本体21上沿其长度方向开有用于安装转子的定子螺旋孔23，所述的定子螺旋孔23的截面为长圆形，所述的定子螺旋孔23的螺距恒定并且定子螺旋孔23的螺距与安装于其中的转子本体11的螺距相等，所述的转子本体11伸入定子螺旋孔23内，并且定子螺旋孔23截面的圆弧部分的直径从定子本体21的一端向另一端由大向小渐变，定子螺旋孔23截面的直线部分的长度从定子本体21的一端向另一端由大向小渐变，使定子螺旋孔23与转子本体11相配合；如图2所示，定子螺旋孔23一端的截面的圆弧部分的直径为D3，另一端的截面的圆弧部分的直径为D4，其中D3＞D4，本发明中的D3略大于D4即可，本实施例中的定子本体21的长度小于转子本体11的长度。
本发明中所述的定子外套22为钢套，所述的转子本体11为橡胶材质(丁腈橡胶)，所述的转子本体11浇注在钢套内。
图7所示的是本发明的螺杆泵，包括吸入室31、排出室32、如图1所示的转子、如图2所示的定子和传动轴33，所述的排出室32包括排出室本体，所述的排出室本体上沿着转子本体11的长度方向开有贯穿其两端的排出通孔311，所述的排出通孔311的截面为圆形，所述的排出室32与螺杆泵用的定子连接后，定子本体21的定子螺旋孔23与排出通孔311相通，所述的吸入室31包括吸入室本体，所述的吸入室本体上沿定子本体21的长度方向开设有吸入腔312，所述的吸入室本休上沿着与定子本体21的长度方向垂直的方向开有用于流体进入吸入室的吸入口313，所述的吸入室本体靠近排出室的一端开有用于将流体输送至定子本体21内的排出口314，螺杆泵用的定子的一端通过排出口314与吸入室31相连并且定子本体上的定子螺旋孔23与吸入腔312相通，所述的转子本体11设置在定子本体21内，所述的接头12通过第一万向节34与传动轴33连接，所述的传动轴33的另一端通过第二万向节35用于与驱动螺杆泵用的转子在螺杆泵用的定子内转动的驱动电机(图中未示出)连接，所述的排出室32和吸入室31分别可拆卸的安装在螺杆泵用的定子的两端，所述的第一万向节34、第二万向节35和传动轴33均位于吸入室31内。本发明中的传动轴33采用可伸缩的传动轴，如申请号为201710329545.0的中国发明专利申请所公开的传动轴。
本实施例中所述的吸入室31和排出室32通过两根以上的拉杆36连接，所述的拉杆36朝着相向的方向对吸入室31和排出室32产生拉力，将螺杆泵用的定子夹紧在吸入室31和排出室32之间。本实施例中所述的排出室本体上靠近吸入室31的一端开有第一定子卡口37，所述的吸入室31上靠近排出室32的一端开有第二定子卡口38，所述的螺杆泵用的定子的两端分别伸入第一定子卡口37和第二定子卡口38内。
所述的排出室32上沿其圆周方向均匀的设有数量与拉杆36的数量相等的第一固定凸起39，所述的第一固定凸起39沿着螺杆泵用的定子的长度方向开有用于固定拉杆36的第一固定通孔，所述的吸入室31上沿其圆周方向均匀的设有数量与拉杆36的数量相等的第二固定凸起310，所述的第二固定凸起310上沿着螺杆泵用的定子的长度方向开有用于固定拉杆36的第二固定通孔。
本实施例中所述的第一固定通孔和第二固定通孔均为光滑的通孔，所述的拉杆 36的两端均设置有螺纹，在所述的第一固定凸起39远离第二固定凸起310的一侧和第二固定凸起310远离第一固定凸起39的一侧分别设置有第一连接螺母和第二连接螺母，所述的拉杆36的两端穿过第一固定通孔和第二固定通孔后分别与第一连接螺母和第二连接螺母螺纹配合，通过调整第一连接螺母和/或第二连接螺母在拉杆36上的位置，用于吸入室31和排出室32夹紧或松开螺杆泵用的定子。
本实施例中所述的第一固定通孔和第二固定通孔也可均为螺纹孔，所述的拉杆36的两端分别设置有旋向相反的螺纹，所述的拉杆36两端分别与第一固定通孔和第二固定通孔螺纹连接，并且在所述的拉杆36的中部设置有连接部，所述的连接部沿螺杆的径向的截面形状为多边形，以方便拉杆36的转动。
定子本体21的寿命在800小时左右，而转子本体11的寿命约1600小时左右，现有技术的螺杆泵在使用800小时左右时，定子本体磨损，其密封性下降，难以保持应有的压力，要更换定子本体21，如图3所示，只需将转子本体11朝着远离接头12的方向移动使转子本体11和定子本体21接触，确保两者的密封性，而无需更换定子本体21，比如可再使用500小时，再次移动转子本体11，最后基本可实现定子本体11与转子本体21的使用时间相当，本发明的螺杆泵的使用寿命提高到1600小时左右，本发明大副提高了螺杆泵整体的使用寿命，降低本发明的使用成本。
以上说明书中未做特别说明的部分均为现有技术，或者通过现有技术既能实现。而且本发明中所述具体实施案例仅为本发明的较佳实施案例而已，并非用来限定本发明的实施范围。即凡依本发明申请专利范围的内容所作的等效变化与修饰，都应作为本发明的技术范畴。

Claims (4)

  1. 一种螺杆泵，其特征在于：包括吸入室(31)、排出室(32)、转子、定子和传动轴(33)，所述的定子包括转子本体(11)和接头(12)，所述的接头(12)与转子本体(11)偏心设置并且两者为一体式结构，所述的转子本体(11)的直径自用于与接头(12)连接的一端向远离接头(12)的一端由大向小渐变；所述的定子包括定子本体(21)和定子外套(22)，所述的定子本体(21)设置在定子外套(22)内并且与定子外套(22)相固定，所述的定子本体(21)上沿其长度方向开有用于安装转子的定子螺旋孔(23)，所述的转子本体(11)伸入定子螺旋孔(23)内，所述的定子螺旋孔(23)的截面为长圆形，并且定子螺旋孔(23)截面的圆弧部分的直径从定子本体(21)的一端向另一端由大向小渐变，定子螺旋孔(23)截面的直线部分的长度从定子本体(21)的一端向另一端由大向小渐变，使定子螺旋孔(23)与转子本体(11)相配合；所述的接头(12)通过第一万向节(34)与传动轴(33)连接，所述的传动轴(33)的另一端通过第二万向节(35)用于与驱动转子在定子内转动的驱动电机连接，所述的排出室(32)和吸入室(31)分别可拆卸的安装在定子的两端，所述的第一万向节(34)、第二万向节(35)和传动轴(33)均位于吸入室(31)内。
  2. 根据权利要求1所述的螺杆泵，其特征在于：所述的吸入室(31)和排出室(32)通过两根以上的拉杆(36)连接，所述的拉杆(36)朝着相向的方向对吸入室(31)和排出室(32)产生拉力，将定子夹紧在吸入室(31)和排出室(32)之间。
  3. 根据权利要求2所述的螺杆泵，其特征在于：所述的排出室(32)上靠近吸入室(31)的一端开有第一定子卡口(37)，所述的吸入室(31)上靠近排出室(32)的一端开有第二定子卡口(38)，所述的定子的两端分别伸入第一定子卡口(37)和第二定子卡口(38)内。
  4. 根据权利要求3所述的螺杆泵，其特征在于：所述的排出室(32)上沿其圆周方向均匀的设有数量与拉杆(36)的数量相等的第一固定凸起(39)，所述的第一固定凸起(39)沿着定子的长度方向开有用于固定拉杆(36)的第一固定通孔，所述的吸入室(31)上沿其圆周方向均匀的设有数量与拉杆(36)的数量相等的第二固定凸起(310)，所述的第二固定凸起(310)上沿着定子的长度方向开有用于固定拉杆(36)的第二固定通孔。
PCT/CN2020/082493 2019-05-23 2020-03-31 螺杆泵 WO2020233244A1 (zh)

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