WO2021109087A1 - 一种泵送系统 - Google Patents

一种泵送系统 Download PDF

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Publication number
WO2021109087A1
WO2021109087A1 PCT/CN2019/123398 CN2019123398W WO2021109087A1 WO 2021109087 A1 WO2021109087 A1 WO 2021109087A1 CN 2019123398 W CN2019123398 W CN 2019123398W WO 2021109087 A1 WO2021109087 A1 WO 2021109087A1
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WO
WIPO (PCT)
Prior art keywords
piston
pump body
pumping system
push rod
groove
Prior art date
Application number
PCT/CN2019/123398
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English (en)
French (fr)
Inventor
吴衍
Original Assignee
惠州海卓科赛医疗有限公司
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Publication of WO2021109087A1 publication Critical patent/WO2021109087A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/22—Arrangements for enabling ready assembly or disassembly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical

Definitions

  • the present invention relates to the technical field of medical devices, in particular to a pumping system.
  • the medical pumping system is usually connected with the doctor's operating device. It is a one-time-use medical device.
  • the pumping system needs to be very simple in structure, easy to install and disassemble, and must be highly reliable. Sex and firmness.
  • the push rod is arranged in the housing, the front end of the push rod is connected with a piston, and the piston cavity is opened in the pump body; during the installation process, the rear end of the body is inserted into the front end of the housing, and then clamped by a clamping structure, At this time, the piston is received in the piston cavity of the pump body; and the prior art mainly has the following disadvantages: firstly, the pump body is poorly fixed, the pump body vibrates in the casing during operation, and the noise is relatively large; secondly, because the system is in During operation, while the push rod drives the piston to slide linearly along the piston cavity, the piston will rotate relative to the pump body due to vibration, which will cause greater wear and damage to the piston.
  • the purpose of the present invention is to overcome the shortcomings of the prior art and provide a pumping system that can improve the fixing performance between the pump body and the casing and reduce the wear of the piston during operation.
  • the present invention provides a pumping system, which includes:
  • the shell has a connecting hole at the front end
  • a pump body, the rear end of the pump body is matched and screwed into the connecting hole, and the rear end of the pump body defines a piston cavity;
  • a push rod is slidably received in the housing, and the front end of the push rod penetrates the piston cavity;
  • a piston received in the piston cavity and located at the front end of the push rod, the piston can move in the axial direction of the piston cavity relative to the pump body;
  • a limit structure is provided between the piston and the pump body, and the limit structure can prevent the piston from rotating relative to the pump body.
  • the limiting structure includes a first sliding groove defined at the rear end of the pump body and a guide portion provided on the outer peripheral wall of the piston, and the first sliding groove is along the axis of the piston cavity. Extending in the direction, the guide part is slidably arranged in the first sliding groove.
  • the front end of the push rod has a first clamping position, and the piston is provided with a second clamping position;
  • the pump body drives the piston to rotate, thereby making the first snap-in position Connect with the second card connector.
  • the first clamping position is at least one clamping block defined on the outer peripheral wall of the front end of the push rod;
  • the rear end of the piston is provided with a first accommodating groove
  • the front end of the push rod is provided in the first accommodating groove
  • the second clamping position is defined on the inner peripheral wall of the first accommodating groove At least one limiting slot corresponding to each of the clamping blocks one by one.
  • a plurality of clamping blocks are distributed circumferentially on the outer peripheral wall of the front end of the push rod, and the inner peripheral wall of the first accommodating groove is provided with a plurality of restriction corresponding to each of the clamping blocks one by one. Bit slot.
  • the piston includes a piston body, a sealing part connected to the front end of the piston body, and a connecting body connected to the rear end of the piston body, and the piston is received in the piston cavity through elastic deformation of the sealing part. Inside, the first receiving groove is opened on the connecting body.
  • the connecting body includes a front section, a transition section, and a rear section that are sequentially connected from front to back, the front section and the rear section are both ring-shaped, the front section is connected to the piston body, and the transition section It includes a plurality of connecting rods distributed at intervals, one end of the connecting rod is connected to the front section, the other end of the connecting rod is connected to the rear section, the inner side of the connecting rod is provided with a stopper, and each stopper The limit groove is defined between the rear end surface of the piston body and the piston body.
  • an internal thread is opened in the connecting hole, and a connecting part engaged with the internal thread is provided on the outer peripheral wall of the pump body.
  • At least two connecting parts are circumferentially provided on the outer peripheral wall of the pump body,
  • the inner side wall of the front end of the housing is provided with a spiral protrusion, the protrusion extends along the axial direction of the piston cavity and defines a spiral screw-in groove, the protrusion and the screw-in groove
  • the groove constitutes the internal thread, and at least two installation grooves corresponding to each of the connecting portions and communicating with the screw-in groove are opened on the rear side of the convex portion.
  • the internal thread is a trapezoidal thread, a round thread, a saw-tooth thread or a square thread.
  • a positioning seat is defined along the circumferential direction of the inner side wall of the casing, and a rotating seat is slidably provided in the casing.
  • the rotating seat is located at the front end of the positioning seat, and the rear end of the pump body is connected to The rotating seat abuts against each other, and an elastic sheet is arranged between the rotating seat and the positioning seat.
  • the pumping system further includes a driving structure provided in the housing, and the driving mechanism can drive the push rod to move linearly and reciprocally along the piston cavity.
  • the driving mechanism includes a transmission shaft and a turntable sleeved on the outside of the transmission shaft, the transmission shaft is eccentrically arranged with respect to the turntable, and the push rod is provided with a first for accommodating the turntable.
  • the push rod is provided with bearings on both sides of the turntable, and the bearings are installed in the housing.
  • the pumping system of the embodiment of the present invention has the following beneficial effects:
  • the pumping system of the embodiment of the present invention connects the pump body and the casing by screwing in, is convenient to install, and is accurately positioned in the axial direction, and has a high degree of self-locking due to the squeezing friction between each other. It can ensure the robustness of the pumping system during operation and reduce noise; in addition, in the pumping system of this embodiment, a limit structure is provided between the piston and the pump body to prevent the piston from rotating relative to the pump body. Avoid free rotation during the axial movement, which can greatly reduce the wear performance of the piston.
  • Figure 1 is a schematic structural diagram of a pumping system according to an embodiment of the present invention.
  • Figure 2 is a schematic diagram of an exploded structure of a pumping system in an embodiment of the present invention
  • Figure 3 is a schematic diagram of a transverse cross-section of a pumping system in an embodiment of the present invention.
  • Fig. 4 is a partial enlarged schematic diagram of the position where the pump body is connected to the casing in Fig. 3;
  • Figure 5 is a schematic longitudinal sectional view of a pumping system in an embodiment of the present invention.
  • Fig. 6 is a schematic structural diagram of a piston of a pumping system in an embodiment of the present invention.
  • Figure 7 is a partial enlarged schematic view of the front end of a push rod of a pumping system in an embodiment of the present invention.
  • Fig. 8 is a schematic structural diagram of a casing of a pumping system in an embodiment of the present invention.
  • Fig. 9 is a state diagram of a pumping system connecting a pump body and a casing in an embodiment of the present invention.
  • first, second, etc. are used in the present invention to describe various information, but this information should not be limited to these terms. These terms are only used to refer to the same type. The information is distinguished from each other.
  • first information can also be referred to as “second” information
  • second information can also be referred to as “first” information.
  • a pumping system includes a casing 1, a pump body 3, a push rod 2, and a piston 4; the front end of the casing 1 is provided with a connecting hole 13, and the pump body The rear end of 3 is screwed into the connecting hole 13, the push rod 2 is slidably received inside the housing 1, the rear end of the pump body 3 defines a piston cavity 32, and the front end of the push rod 2 penetrates In the piston cavity 32, the piston 4 is received in the piston cavity 32 and located at the front end of the push rod 2, and the piston 4 can move in the axial direction of the piston cavity 32 relative to the pump body 3; Wherein, a limit structure is provided between the piston 4 and the pump body 3, and the limit structure can prevent the piston 4 from rotating relative to the pump body 3.
  • the pump body 3 and the housing 1 are connected by screwing, which is not only convenient for connection, but also can be accurately positioned in the axial direction.
  • the squeezing friction force between each other has a high degree of self-locking characteristic, which prevents the vibration of the pumping system from causing the pump body 3 and the housing 1 to separate from each other; in addition, in this embodiment, the setting is useful
  • the limit structure that restricts the relative rotation of the piston 4 relative to the pump body 3 can prevent the piston 4 from rotating relative to the pump body 3, avoid free rotation during the axial movement of the piston 4, and can greatly reduce the wear performance of the piston 4.
  • the limiting structure in this embodiment includes a first sliding groove 33 defined at the rear end of the pump body 3 and a guide portion 41 provided on the outer peripheral wall of the piston 4.
  • the first sliding groove 33 Extending in the axial direction of the piston cavity 32, the guide portion 41 is slidably provided in the first sliding groove 33; before inserting the pump body 3, the first sliding groove 33 is aligned with the guide portion 41, and the guide portion 41 is screwed in During the process of the pump body 3, the pump body 3 drives the piston 4 to rotate; during the operation of the system, the push rod 2 drives the piston 4 to move linearly back and forth in the piston cavity 32. At this time, the piston 4 slides in the first sliding groove 33. Due to the limiting effect of the first sliding groove 33 on the piston 4, the piston 4 can be prevented from rotating in the piston cavity 32 during the operation of the system, and the wear of the piston 4 during the operation can be reduced.
  • the piston and the push rod are usually connected by elastic deformation of the piston jaws. Because the piston has a higher motion frequency and higher power transmission, the wear resistance, creep resistance and strength of the piston are caused. And so on, put forward higher requirements, and at the same time also put forward high requirements for the processing technology of the piston.
  • a first clamping position is provided at the front end of the push rod 2, and a second clamping position is provided on the piston 4; during the installation process, when the first sliding groove 33 align the guide portion 41, and rotate the pump body 3 so that when the pump body 3 is screwed into the connecting hole 13, the pump body 3 drives the piston 4 to rotate, thereby causing the first clamping The position is clamped with the second clamping position, so that when the pump body 3 and the casing 1 are connected, the piston 4 is quickly installed on the front end of the push rod 2.
  • the first clamping position is a plurality of clamping blocks 21 defined on the outer peripheral wall of the front end of the push rod 2 and distributed at intervals in the circumferential direction; as shown in FIG.
  • the rear end surface of the piston 4 is provided with a first accommodating groove 42, the front end of the push rod 2 is provided in the first accommodating groove 42, and the piston 4 can rotate relative to the push rod 2, so
  • the second clamping position is a plurality of restriction grooves 421 defined on the inner peripheral wall of the first accommodating groove 42 corresponding to each of the clamping blocks 21 one by one.
  • the pump body 3 When the pump body 3 is tightened to the front end of the housing 1, the pump body 3 drives the piston 4 to rotate to each card
  • the blocks 21 are all clamped at a position in a limiting groove 421, and at this time, the piston 4 is fixed to the front end of the push rod 2, which can realize quick installation.
  • the piston 4 includes: a piston body 43, a sealing portion 44 connected to the front end of the piston body 43, and a connecting body 45 connected to the rear end of the piston body 43, so The piston 4 is received in the piston cavity 32 through the elastic deformation of the sealing portion 44, and the first receiving groove 42 is opened on the connecting body 45.
  • the piston body 43 is a rigid body, such as a metal piece
  • the sealing portion 44 and the connecting body 45 are both elastic pieces, and are connected to the piston body 43 by injection molding or interference fit or welding.
  • the sealing portion 44 and the piston cavity 32 is connected in a sealed and abutted manner, and the connecting body 45 is used for fixed connection with the push rod 2 and sliding connection with the pump body 3.
  • the connecting body 45 in this embodiment includes a front section 451, a transition section 452, and a rear section 453 that are sequentially connected from front to back.
  • the front section 451 and the rear section 453 are both ring-shaped, and the front section 451 is connected to the rear section 453.
  • the piston body 43 is connected, the transition section 452 includes a plurality of spaced connecting rods 4521, one end of the connecting rod 4521 is connected to the front section 451, the other end of the connecting rod 4521 is connected to the rear section 453, the inner side of the connecting rod 4521 It has a stop 4521b, and the stop groove 421 is defined between each stop 4521b and the rear end surface of the piston body 43; when the piston 4 is rotated to the push rod 2, each stop 21 corresponds to the stop groove 421.
  • each limit groove 421 When set in each limit groove 421, the piston 4 can be fixed to the front end of the push rod 2. On the contrary, if the piston 4 needs to be removed from the push rod 2, it will be rotated until the blocks 21 are adjacent to each other. The position between the two connecting rods 4521 can be used.
  • the connecting hole 13 is provided with an internal thread 11
  • the outer peripheral wall of the pump body 3 is provided with a connecting portion 31 engaged with the internal thread 11, and the pump body 3 and the housing
  • the screw connection between 1 can further improve the self-locking performance and prevent the pump body 3 from detaching from the housing 1 due to vibration during system operation.
  • At least two connecting portions 31 are circumferentially provided on the outer peripheral wall of the pump body 3; correspondingly, as shown in FIG. 8, the inner side wall of the front end of the housing 1 is provided with a spiral protrusion 111, the protrusion 111 extends along the axial direction of the piston cavity 32 and defines a spiral screw-in groove 112,
  • the raised portion 111 and the screw-in groove 112 constitute the internal thread 11, and at least two are provided on the rear side of the raised portion 111 corresponding to each connecting portion 31 and communicate with the screw-in
  • the grooves 112 communicate with the installation grooves 1111, and one of the installation grooves 1111 is defined at the rear end of the boss 111.
  • the pump body 3 when the pump body 3 includes two connecting portions 31, two mounting grooves 1111 are opened on the protrusion 111 of the casing 1, as shown in FIG. 8; when the pump body 3 is inserted, two of them The connecting parts 31 are respectively aligned with the corresponding mounting grooves 1111, so that the connecting parts 31 are inserted into the screw-in groove 112, as shown in the state 1 in Fig. 9, at this time, the pump body 3 is rotated clockwise along the screw-in groove 112 After 60°, as shown in the second state of FIG. 9, the pump body 3 and the casing 1 are clamped by threads at this time.
  • the internal thread 11 on the housing 1 is preferably a trapezoidal thread, a round thread, a sawtooth thread or a square thread; the thread form includes metric thread, American thread, inch thread, etc.; it can further ensure the tightness and can Screw into the pump body 3 flexibly.
  • an irregularly gradual screw-in groove may also be provided in the connecting hole 13.
  • a positioning seat 12 is defined along the circumferential direction of the inner side wall of the casing 1, and a rotating seat is also slidably provided in the casing 1 5.
  • the rotating seat 5 is located at the front end of the positioning seat 12, the rear end of the pump body 3 abuts the rotating seat 5, and there is elasticity between the rotating seat 5 and the positioning seat 12
  • the sheet 6 and the elastic sheet 6 can provide a pre-tightening force between the casing 1 and the pump body 3, thereby effectively preventing the pump body 3 from falling off the casing 1 when vibration occurs during the operation of the system.
  • a drive mechanism is also provided in the housing 1.
  • the power output end of the drive mechanism is connected to the push rod 2.
  • the drive mechanism can drive the push rod 2 to move linearly and reciprocally along the piston cavity 32, thereby The medium in the piston chamber 32 is pressurized.
  • the driving mechanism in this embodiment includes a transmission shaft 7 and a turntable 8 sleeved on the outside of the transmission shaft 7.
  • the transmission shaft 7 is eccentrically arranged with respect to the turntable 8, and the push rod 2 is provided with a turntable for accommodating the turntable.
  • the front and rear sides of the turntable 8 respectively abut against the front and rear side walls of the second containing groove 22, and the push rod 2 is provided with a piston cavity along the 32 axially extending second sliding groove 23, the transmission shaft 7 passes through the second sliding groove 23 and is rotatably connected with the housing 1; since the transmission shaft 7 is eccentrically arranged with respect to the turntable 8, the transmission When the shaft 7 rotates to drive the turntable 8 to rotate, it can push the push rod 2 to move linearly back and forth.
  • the lower end of the transmission shaft 7 passes through the housing 1, and the end of the transmission shaft 7 protruding from the outside of the housing 1 is used to connect with the power output end of the motor.
  • the push rod 2 is provided with bearings 9 on both sides of the turntable 8.
  • the bearing 9 is installed in the housing 1.
  • the bearing 9 supports the push rod 2.
  • Bearings 9 are provided at the front and rear ends of the push rod 2 so as to reduce the bending moment effect during the rotation of the turntable 8 and ensure the straightness of the push rod 2 when it moves.
  • the embodiments of the present invention provide a pumping system.
  • the pump body and the casing of the pumping system are connected in a screw-in manner, and the axial positioning is accurate. At the same time, it has a high degree of self-locking characteristics, which can ensure pumping.
  • the robustness of the system during operation reduces noise; in addition, in the pumping system of this embodiment, there is a limit structure for sewing the piston to rotate relative to the pump body between the piston and the pump body, and it moves in the axial direction of the piston. Avoid free rotation during the process, which can greatly reduce the wear performance of the piston.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

一种泵送系统，包括：壳体（1），前端开设有连接孔（13）；泵体（3），后端配合旋入连接孔（13）中，泵体（3）的后端限定有活塞腔（32）；推杆（2），滑动接纳于壳体（1）的内部，推杆（2）的前端穿设于活塞腔（32）内；活塞（4），接纳于活塞腔（32）内且位于推杆（2）的前端，活塞（4）能够相对于泵体（3）沿活塞腔（32）的轴向运动；活塞（4）与泵体（3）之间设有限位结构，限位结构能够防止活塞（4）相对泵体（3）转动。该泵送系统通过旋入的方式连接泵体与壳体，能够提高泵体与壳体之间的固定性能，降低系统的运行噪音，运行过程中活塞不能发生转动，减少活塞在运行过程中的磨损。

Description

一种泵送系统 技术领域
本发明涉及医疗器械技术领域，特别是涉及一种泵送系统。
背景技术
在现有医疗器械产品中，医用泵送系统通常与医生操作装置连接在一起，为一次性使用医用器械，泵送系统的结构需要非常简单，安装和拆卸非常简便，同时需要具有很高的可靠性和牢固性。
现有技术中，推杆设于壳体内，推杆的前端连接有活塞，活塞腔开设于泵体内；安装过程中，将本体的后端插入壳体的前端，再通过卡接结构卡紧，此时活塞接纳于泵体的活塞腔内；而现有技术主要存在以下缺点：首先，泵体固定性差，运行中泵体在壳体中出现振动，发出的噪声较大；其次，由于系统在运行时，推杆带动活塞沿活塞腔直线滑动的同时，由于振动原因活塞会相对泵体发生转动，从而对活塞的磨损破坏较大。
发明内容
本发明的目的是：克服现有技术的不足，提供一种泵送系统，能够提高泵体与壳体之间的固定性能，且减少活塞在运行过程中的磨损。
为了实现上述目的，本发明提供了一种泵送系统，其包括：
壳体，前端开设有连接孔；
泵体，后端配合旋入所述连接孔中，所述泵体的后端限定有活塞腔；
推杆，滑动接纳于所述壳体的内部，所述推杆的前端穿设于所述活塞腔内；
活塞，接纳于所述活塞腔内且位于所述推杆的前端，所述活塞能够相对于所述泵体沿所述活塞腔的轴向运动；
其中，所述活塞与所述泵体之间设有限位结构，所述限位结构能 够防止所述活塞相对所述泵体发生转动。
作为优选方案，所述限位结构包括限定于所述泵体的后端的第一滑槽及设于所述活塞的外周壁上的导向部，所述第一滑槽沿所述活塞腔的轴向延伸，所述导向部滑动设于所述第一滑槽内。
作为优选方案，所述推杆的前端具有第一卡接位，所述活塞上设有第二卡接位；
当所述第一滑槽接纳所述导向部，转动所述泵体使得所述泵体旋入所述连接孔时，所述泵体带动所述活塞转动，进而使得所述第一卡接位与所述第二卡接位卡接。
作为优选方案，所述第一卡接位为限定于推杆的前端的外周壁上的至少一个卡块；
所述活塞的后端开设有第一容纳槽，所述推杆的前端设于所述第一容纳槽内，所述第二卡接位为限定于所述第一容纳槽的内周壁上的至少一个与各所述卡块一一相对应的限位槽。
作为优选方案，所述推杆的前端的外周壁上周向间隔分布有多个卡块，所述第一容纳槽的内周壁上设有多个与各所述卡块一一相对应的限位槽。
作为优选方案，所述活塞包括：活塞本体、连接于所述活塞本体前端的密封部及连接于所述活塞本体后端的连接体，所述活塞通过所述密封部弹性变形接纳于所述活塞腔内，所述第一容纳槽开设于所述连接体上。
作为优选方案，所述连接体包括从前至后依次连接的前段、过渡段及后段，所述前段与所述后段均呈环状，所述前段与所述活塞本体相连，所述过渡段包括多个间隔分布的连接杆，所述连接杆的一端与所述前段相连，所述连接杆的另一端连接所述后段，所述连接杆的内侧面具有挡块，各所述挡块与所述活塞本体的后端面之间均限定成所述限位槽。
作为优选方案，所述连接孔内开设有内螺纹，所述泵体的外周壁 上设置有与所述内螺纹相啮合的连接部。
作为优选方案，所述泵体的外周壁上周向设置有至少两个所述连接部，
所述壳体前端的内侧壁上设有螺旋状的凸起部，所述凸起部沿活塞腔的轴向延伸并限定有螺旋状的旋入槽，所述凸起部及所述旋入槽构成所述内螺纹，所述凸起部的后侧面上开设有至少两个与各所述连接部一一相对应且连通所述旋入槽的安装槽。
作为优选方案，所述内螺纹为梯形螺纹或圆螺纹或锯齿形螺纹或方螺纹。
作为优选方案，沿所述壳体的内侧壁周向限定有定位座，所述壳体内还滑动设有旋转座，所述旋转座位于所述定位座的前端，所述泵体的后端与所述旋转座相抵接，且所述旋转座与所述定位座之间设有弹性片。
作为优选方案，所述泵送系统还包括设于所述壳体内的驱动结构，所述驱动机构能够驱动所述推杆沿所述活塞腔直线往返运动。
作为优选方案，所述驱动机构包括传动轴及套设于所述传动轴外部的转盘，所述传动轴相对于所述转盘呈偏心设置，所述推杆上开设有用于容纳所述转盘的第二容纳槽，所述转盘的前、后两侧分别与所述第二容纳槽的前、后两侧壁相抵接，所述推杆上开设有沿所述活塞腔的轴向延伸的第二滑槽，所述传动轴穿过所述第二滑槽并与所述壳体转动相连。
作为优选方案，所述推杆位于所述转盘的两侧均套设有轴承，所述轴承安装于所述壳体内。
本发明实施例一种泵送系统与现有技术相比，其有益效果在于：
本发明实施例的泵送系统，通过旋入的方式连接泵体与壳体，安装方便，且在轴向定位准确，且由于相互之间的挤压摩擦力作用，具有高度的自锁特性，能够保证泵送系统在运行过程中的牢固性，降低噪音；另外，本实施例中的泵送系统，在活塞与泵体之间设有防止活 塞相对泵体发生转动的限位结构，在活塞轴向移动过程中避免发生自由转动，可大幅度减少活塞的磨损性能。
附图说明
图1是本发明实施例一种泵送系统的结构示意图；
图2是本发明实施例中一种泵送系统的爆炸结构示意图；
图3是本发明实施例中一种泵送系统的横向剖面示意图；
图4是图3中关于泵体与壳体相连的位置处的局部放大示意图；
图5是本发明实施例中一种泵送系统的纵向剖面示意图；
图6是本发明实施例中一种泵送系统的活塞的结构示意图；
图7是本发明实施例中一种泵送系统的推杆的前端的局部放大示意图；
图8是本发明实施例中一种泵送系统的壳体的结构示意图；
图9是本发明实施例中一种泵送系统泵体与壳体相连的状态图。
图中，1、壳体；11、内螺纹；111、凸起部；1111、安装槽；112、旋入槽；12、定位座；13、连接孔；2、推杆；21、卡块；22、第二容纳槽；23、第二滑槽；3、泵体；31、连接部；32、活塞腔；33、第一滑槽；4、活塞；41、导向部；42、第一容纳槽；421、限位槽；43、活塞本体；44、密封部；45、连接体；451、前段；452、过渡段；4521、连接杆；4521b、挡块；453、后段；5、旋转座；6、弹性片；7、传动轴；8、转盘；9、轴承。
具体实施方式
下面结合附图和实施例，对本发明的具体实施方式作进一步详细描述。以下实施例用于说明本发明，但不用来限制本发明的范围。
在本发明的描述中，应当理解的是，本发明中采用术语“第一”、“第二”等来描述各种信息，但这些信息不应限于这些术语，这些术语仅用来将同一类型的信息彼此区分开。例如，在不脱离本实用新型范围的情况下，“第一”信息也可以被称为“第二”信息，类似的，“第二”信息也 可以被称为“第一”信息。
另外，需要说明的是，本实施例中，当该泵送系统与医生操作装置相连时，靠近医生操作装置的一端为“前”，背离医生操作装置的一端为“后”。
如图1-9所示，本发明优选实施例的一种泵送系统，其包括壳体1、泵体3、推杆2及活塞4；壳体1的前端开设有连接孔13，泵体3的后端配合旋入连接孔13内，推杆2滑动接纳于所述壳体1的内部，所述泵体3的后端限定有活塞腔32，所述推杆2的前端穿设于所述活塞腔32内，活塞4接纳于所述活塞腔32内且位于所述推杆2的前端，所述活塞4能够相对于所述泵体3沿所述活塞腔32的轴向运动；其中，所述活塞4与所述泵体3之间设有限位结构，所述限位结构能够防止所述活塞4相对所述泵体3发生转动。
基于上述技术方案，本实施例中的泵送系统中，在安装过程中，通过将泵体3与壳体1通过旋入的方式连接，不仅连接方便，且能够在轴向定位准确，且由于相互之间的挤压摩擦力作用，具有高度的自锁特性，防止在泵送系统运行过程中的振动使泵体3与壳体1之间发生脱离；另外，本实施例中，由于设置有用于限制活塞4相对于泵体3相对转动的限位结构，能够防止活塞4相对泵体3转动，在活塞4轴向移动过程中避免发生自由转动，可大幅度减少活塞4的磨损性能。
具体地，本实施例中的限位结构包括限定于所述泵体3的后端的第一滑槽33及设于所述活塞4的外周壁上的导向部41，所述第一滑槽33沿所述活塞腔32的轴向延伸，所述导向部41滑动设于所述第一滑槽33内；在插入泵体3前，将第一滑槽33对准导向部41，在旋入泵体3的过程中，泵体3带动活塞4发生转动；在系统运行过程中，推杆2带动活塞4在活塞腔32内直线往返运动，此时活塞4在第一滑槽33内滑动，由于第一滑槽33对于活塞4的限位作用，能够防止系统运行过程中活塞4在活塞腔32内转动，可降低活塞4运行过程中的磨损。
现有技术中，通常活塞与推杆之间通过活塞卡爪的弹性变形来实 现连接，由于活塞存在较高运动频率和较大功率传动，导致对活塞的耐磨性、抗蠕变性能以及强度等都提出了较高的要求，同时对于活塞的加工工艺也提出了很高的要求。针对此缺陷，进一步地，本实施例中在推杆2的前端设置第一卡接位，在所述活塞4上设有第二卡接位；在安装过程中，当所述第一滑槽33对准所述导向部41，转动所述泵体3使得所述泵体3旋入所述连接孔13时，所述泵体3带动所述活塞4转动，进而使得所述第一卡接位与所述第二卡接位卡接，从而使得在连接泵体3与壳体1时，将活塞4快速安装于推杆2的前端。
具体地，本实施例中，如图7所示，所述第一卡接位为限定于推杆2的前端的外周壁上且周向间隔分布的多个卡块21；如图6所示，所述活塞4的后端面上开设有第一容纳槽42，所述推杆2的前端设于所述第一容纳槽42内，所述活塞4能够相对所述推杆2发生转动，所述第二卡接位为限定于所述第一容纳槽42的内周壁上的多个与各所述卡块21一一相对应的限位槽421。当插入泵体3至壳体1内，并转动泵体3时，泵体3带动活塞4转动，当旋紧泵体3至壳体1的前端时，泵体3带动活塞4转动至各卡块21均卡设于一限位槽421内的位置处，此时活塞4固定于推杆2的前端，能够实现快速安装。
继续参阅附图6所示，本实施例中，所述活塞4包括：活塞本体43、连接于所述活塞本体43前端的密封部44及连接于所述活塞本体43后端的连接体45，所述活塞4通过所述密封部44弹性变形接纳于所述活塞腔32内，所述第一容纳槽42开设于所述连接体45上。其中，活塞本体43为刚性体，如金属件，密封部44及连接体45均为弹性件，并通过注塑成型或者过盈配合或者熔接等方式连接于活塞本体43上，密封部44与活塞腔32密封抵接相连，连接体45用于与推杆2固定相连，并与泵体3之间滑动相连。
进一步地，本实施例中的连接体45包括从前至后依次连接的前段451、过渡段452及后段453，所述前段451与所述后段453均呈环状，所述前段451与所述活塞本体43相连，所述过渡段452包括多个间隔 分布的连接杆4521，连接杆4521的一端与前段451相连，连接杆4521的另一端连接后段453，所述连接杆4521的内侧面具有挡块4521b，各所述挡块4521b与所述活塞本体43的后端面之间均限定成所述限位槽421；当转动活塞4至推杆2的各卡块21一一相对应卡设于各限位槽421内时，即能够将活塞4固定于推杆2的前端，相反地，若需要将活塞4从推杆2上拆卸时，即转动至各卡块21均处于相邻的两连接杆4521之间的位置即可。
进一步地，本实施例中，所述连接孔13内开设有内螺纹11，所述泵体3的外周壁上设置有与所述内螺纹11相啮合的连接部31，泵体3与壳体1之间采用螺接，可进一步提高自锁性能，防止系统运行时由于振动导致泵体3从壳体1中脱离。
为了灵活地将泵体3旋入壳体1的内螺纹11中，本实施例中，所述泵体3的外周壁上周向设置有至少两个所述连接部31；相对应地，如图8所示，所述壳体1前端的内侧壁上设有螺旋状的凸起部111，所述凸起部111沿活塞腔32的轴向延伸并限定有螺旋状的旋入槽112，所述凸起部111及所述旋入槽112构成所述内螺纹11，所述凸起部111的后侧面上开设有至少两个与各连接部31一一相对应且连通所述旋入槽112连通的安装槽1111，其中一个安装槽1111限定于凸起部111的后端部。
具体地，当泵体3包括两个连接部31时，该壳体1的凸起部111上开设有两个安装槽1111，具体如图8所示；在插入泵体3时，其中两个连接部31分别对准与其对应的安装槽1111，从而将连接部31插入旋入槽112内，具体如图9中的状态一所示，此时将泵体3沿旋入槽112顺时针旋转60°后，如附图9的状态二所示，此时泵体3与壳体1通过螺纹卡紧。
本实施例中，壳体1上的内螺纹11优选为梯形螺纹或圆螺纹或锯齿形螺纹或方螺纹；螺纹形式包括公制螺纹、美制螺纹、英制螺纹等；能够进一步保证紧固性，且能够灵活地旋入泵体3。
作为上述技术方案的可替换方案，本实施例中，也可在连接孔13内设置呈不规则渐进形式的旋入槽。
为了使得泵体3与壳体1在泵送系统运行过程中仍保持可靠相连，沿所述壳体1的内侧壁周向限定有定位座12，所述壳体1内还滑动设有旋转座5，所述旋转座5位于所述定位座12的前端，所述泵体3的后端与所述旋转座5相抵接，且所述旋转座5与所述定位座12之间设有弹性片6，弹性片6能够在壳体1与泵体3之间提供一个预紧力，从而有效防止在系统运行过程中发生振动时，泵体3从壳体1中脱落。
更具体地，本实施例中，在壳体1中还设置有驱动机构，该驱动机构的动力输出端与推杆2相连，驱动机构能够带动推杆2沿活塞腔32直线往返运动，从而对活塞腔32内的介质进行加压。
进一步地，本实施例中的驱动机构包括传动轴7及套设于传动轴7外部的转盘8，传动轴7相对于转盘8呈偏心设置，所述推杆2上开设有用于容纳所述转盘8的第二容纳槽22，所述转盘8的前、后两侧分别与所述第二容纳槽22的前、后两侧壁相抵接，所述推杆2上开设有沿所述活塞腔32的轴向延伸的第二滑槽23，所述传动轴7穿过所述第二滑槽23并与所述壳体1转动相连；由于传动轴7相对于转盘8呈偏心设置，因此传动轴7转动带动转盘8转动时，能够推动推杆2直线往返运动。
示例性地，如图5所示，传动轴7的下端穿过壳体1，传动轴7凸出于壳体1外部的端部用于与电机的动力输出端相连。
本实施例中，所述推杆2位于所述转盘8的两侧均套设有轴承9，所述轴承9安装于所述壳体1内，轴承9对推杆2起到支撑作用，由于在推杆2的前、后两端均设置有轴承9，从而能够降低转盘8转动过程中的弯矩效应，保证推杆2移动时的直线度。
综上，本发明实施例提供一种泵送系统，泵送系统的泵体与壳体之间通旋入的方式相连，在轴向定位准确，同时具有高度的自锁特性，能够保证泵送系统在运行过程中的牢固性，降低噪音；另外，本实施 例中的泵送系统，在活塞与泵体之间设有缝制活塞相对泵体发生转动的限位结构，在活塞轴向移动过程中避免发生自由转动，可大幅度减少活塞的磨损性能。
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明技术原理的前提下，还可以做出若干改进和替换，这些改进和替换也应视为本发明的保护范围。

Claims (14)

  1. 一种泵送系统，其特征在于，包括：
    壳体，前端开设有连接孔；
    泵体，后端配合旋入所述连接孔中，所述泵体的后端限定有活塞腔；
    推杆，滑动接纳于所述壳体的内部，所述推杆的前端穿设于所述活塞腔内；
    活塞，接纳于所述活塞腔内且位于所述推杆的前端，所述活塞能够相对于所述泵体沿所述活塞腔的轴向运动；
    其中，所述活塞与所述泵体之间设有限位结构，所述限位结构能够防止所述活塞相对所述泵体发生转动。
  2. 如权利要求1所述的泵送系统，其特征在于，所述限位结构包括限定于所述泵体的后端的第一滑槽及设于所述活塞的外周壁上的导向部，所述第一滑槽沿所述活塞腔的轴向延伸，所述导向部滑动设于所述第一滑槽内。
  3. 如权利要求2所述的泵送系统，其特征在于，所述推杆的前端具有第一卡接位，所述活塞上设有第二卡接位；
    当所述第一滑槽接纳所述导向部，转动所述泵体使得所述泵体旋入所述连接孔时，所述泵体带动所述活塞转动，进而使得所述第一卡接位与所述第二卡接位卡接。
  4. 如权利要求3所述的泵送系统，其特征在于，所述第一卡接位为限定于推杆的前端的外周壁上的至少一个卡块；
    所述活塞的后端开设有第一容纳槽，所述推杆的前端设于所述第一容纳槽内，所述第二卡接位为限定于所述第一容纳槽的内周壁上的至少一个与各所述卡块一一相对应的限位槽。
  5. 如权利要求4所述的泵送系统，其特征在于，所述推杆的前端的外周壁上周向间隔分布有多个卡块，所述第一容纳槽的内周壁上设 有多个与各所述卡块一一相对应的限位槽。
  6. 如权利要求5所述的泵送系统，其特征在于，所述活塞包括：活塞本体、连接于所述活塞本体前端的密封部及连接于所述活塞本体后端的连接体，所述活塞通过所述密封部弹性变形接纳于所述活塞腔内，所述第一容纳槽开设于所述连接体上。
  7. 如权利要求6所述的泵送系统，其特征在于，所述连接体包括从前至后依次连接的前段、过渡段及后段，所述前段与所述后段均呈环状，所述前段与所述活塞本体相连，所述过渡段包括多个间隔分布的连接杆，所述连接杆的一端与所述前段相连，所述连接杆的另一端连接所述后段，所述连接杆的内侧面具有挡块，各所述挡块与所述活塞本体的后端面之间均限定成所述限位槽。
  8. 如权利要求1所述的泵送系统，其特征在于，所述连接孔内开设有内螺纹，所述泵体的外周壁上设置有与所述内螺纹相啮合的连接部。
  9. 如权利要求8所述的泵送系统，其特征在于，所述泵体的外周壁上周向设置有至少两个所述连接部，
    所述壳体前端的内侧壁上设有螺旋状的凸起部，所述凸起部沿活塞腔的轴向延伸并限定有螺旋状的旋入槽，所述凸起部及所述旋入槽构成所述内螺纹，所述凸起部的后侧面上开设有至少两个与各所述连接部一一相对应且连通所述旋入槽的安装槽。
  10. 如权利要求8所述的泵送系统，其特征在于，所述内螺纹为梯形螺纹或圆螺纹或锯齿形螺纹或方螺纹。
  11. 如权利要求1-10中任一项所述的泵送系统，其特征在于，沿所述壳体的内侧壁周向限定有定位座，所述壳体内还滑动设有旋转座，所述旋转座位于所述定位座的前端，所述泵体的后端与所述旋转座相抵接，且所述旋转座与所述定位座之间设有弹性片。
  12. 如权利要求1所述的泵送系统，其特征在于，还包括设于所述壳体内的驱动结构，所述驱动机构能够驱动所述推杆沿所述活塞腔 直线往返运动。
  13. 如权利要求12所述的泵送系统，其特征在于，所述驱动机构包括传动轴及套设于所述传动轴外部的转盘，所述传动轴相对于所述转盘呈偏心设置，所述推杆上开设有用于容纳所述转盘的第二容纳槽，所述转盘的前、后两侧分别与所述第二容纳槽的前、后两侧壁相抵接，所述推杆上开设有沿所述活塞腔的轴向延伸的第二滑槽，所述传动轴穿过所述第二滑槽并与所述壳体转动相连。
  14. 如权利要求13所述的泵送系统，其特征在于，所述推杆位于所述转盘的两侧均套设有轴承，所述轴承安装于所述壳体内。
PCT/CN2019/123398 2019-12-04 2019-12-05 一种泵送系统 WO2021109087A1 (zh)

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WO2008009797A2 (fr) * 2006-07-18 2008-01-24 Pulssar Technologies Unité de pompage a durée de vie élevée
CN201377422Y (zh) * 2008-12-31 2010-01-06 重庆建设摩托车股份有限公司 活塞的防转结构
DE102014202108A1 (de) * 2014-02-06 2015-08-06 Robert Bosch Gmbh Kolbenführungsbuchse und hydrostatische Kolbenmaschine mit einer Kolbenführungsbuchse
CN108397381A (zh) * 2018-05-10 2018-08-14 惠州海卓科赛医疗有限公司 一种医疗用柱塞泵及其腔室结构
CN108894978A (zh) * 2018-08-15 2018-11-27 惠州海卓科赛医疗有限公司 一种高压泵及高压泵送方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1427153A (zh) * 2001-12-17 2003-07-02 乐金电子(天津)电器有限公司 带有容积式油泵的压缩机机轴
WO2008009797A2 (fr) * 2006-07-18 2008-01-24 Pulssar Technologies Unité de pompage a durée de vie élevée
CN201377422Y (zh) * 2008-12-31 2010-01-06 重庆建设摩托车股份有限公司 活塞的防转结构
DE102014202108A1 (de) * 2014-02-06 2015-08-06 Robert Bosch Gmbh Kolbenführungsbuchse und hydrostatische Kolbenmaschine mit einer Kolbenführungsbuchse
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