WO2009132494A1 - 计量泵及其驱动装置 - Google Patents

计量泵及其驱动装置 Download PDF

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Publication number
WO2009132494A1
WO2009132494A1 PCT/CN2008/071796 CN2008071796W WO2009132494A1 WO 2009132494 A1 WO2009132494 A1 WO 2009132494A1 CN 2008071796 W CN2008071796 W CN 2008071796W WO 2009132494 A1 WO2009132494 A1 WO 2009132494A1
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WO
WIPO (PCT)
Prior art keywords
pump
sleeve
push
pull rod
pump body
Prior art date
Application number
PCT/CN2008/071796
Other languages
English (en)
French (fr)
Inventor
林波
林江
Original Assignee
Lin Bo
Lin Jiang
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lin Bo, Lin Jiang filed Critical Lin Bo
Priority to ES08783789T priority Critical patent/ES2386839T3/es
Priority to AU2008355707A priority patent/AU2008355707A1/en
Priority to AT08783789T priority patent/ATE555306T1/de
Priority to EP08783789A priority patent/EP2270334B1/en
Priority to KR1020107018157A priority patent/KR101423809B1/ko
Priority to JP2011506551A priority patent/JP2011518986A/ja
Priority to KR1020147006890A priority patent/KR101423906B1/ko
Priority to RU2010148313/06A priority patent/RU2488715C2/ru
Priority to CA2717565A priority patent/CA2717565A1/en
Publication of WO2009132494A1 publication Critical patent/WO2009132494A1/zh
Priority to US12/854,193 priority patent/US8197237B2/en

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Classifications

    • 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
    • F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
    • 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
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/01—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being mechanical
    • 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
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/04—Piston machines or pumps characterised by having positively-driven valving in which the valving is performed by pistons and cylinders coacting to open and close intake or outlet ports

Definitions

  • the present invention relates to a metering pump and a driving device thereof, and more particularly to a metering pump using a plunger and a driving device therefor.
  • Metering pumps are often used to inject or withdraw a metered auxiliary liquid into a primary liquid medium.
  • the metrology requirements in these applications are often very precise, even for trace leaks and deviations.
  • the sealing, accuracy and accuracy of the metering pump must be very strict.
  • the existing metering pumps generally have a peristaltic pump, a plunger pump, a diaphragm pump, and a syringe pump.
  • the peristaltic pump uses a roller to rotate the squeeze hose to achieve the purpose of transporting liquid.
  • the principle of several other pumps is roughly the same: by the reciprocating motion of the diaphragm or the cylindrical piston, pressure or negative pressure is generated in the cavity, and the two check valves respectively located at the liquid inlet and the liquid outlet are closed or opened to complete the liquid transportation. .
  • the peristaltic pump is difficult to achieve a small amount, accurate, easy to age the hose, poor acid and alkali resistance, and less resistant to solvents.
  • Other metering pumps have the following disadvantages due to the use of a one-way valve as the opening and closing switch for the liquid in the pump body: First, the check valve is only large enough under pressure or negative pressure to be greater than the elastic restoring force of the one-way valve.
  • Chinese utility model patent 2005201154431 discloses a metering pump in which a plunger sleeve is arranged in the pump body, the plunger slides back and forth in the plunger sleeve, and the plunger sleeve can rotate relative to the pump body, when the plunger sleeve is inhaled.
  • the port or output port is rotated to the corresponding position on the pump body, the connection between the pump chamber and the liquid input channel or the liquid output channel is achieved.
  • the metering pump can avoid the metering deviation caused by the opening and closing and sealing problems of the one-way valve due to the reduction of the one-way valve.
  • the plunger sleeve of the metering pump needs to rotate in the pump body, the sealing and fitting precision between the liquid inlet and outlet of the plunger sleeve and the pump body are high, The work is difficult, and the movement of the liquid inlet and outlet on the plunger sleeve on the inside of the pump body is a circular ring, and it is not easy to adjust the sealing gap.
  • the metering pump plunger cannot transport all the liquid in the plunger sleeve to the outside in one complete stroke, the metering deviation may be caused by the residual liquid.
  • An object of the present invention is to provide a metering pump having a simple structure and high metering accuracy and a driving device therefor.
  • a metering pump characterized in that: the metering pump comprises a pump sleeve, a pump body slidably mounted in the pump sleeve, a plunger is installed in the cavity of the pump body, and a cavity is arranged on the side wall of the pump body
  • the air guiding hole of the communication has a liquid suction hole and a liquid discharge hole on the pump sleeve, and the opening of the liquid suction hole and the liquid discharge hole on the inner side of the pump sleeve is located on a sliding track of the opening of the flow guiding hole on the pump body.
  • a driving device for driving the above metering pump characterized in that: the driving device comprises a casing fixedly connected with the pump sleeve, a push-pull rod fixed to the pump body, a limiting device for restricting the sliding stroke of the pump body, and slidable a slider mounted in the housing; the plunger is fixedly coupled to the slider, the push-pull rod is passed through the inside of the slider, and a shaft is disposed on the slider between the push-pull rod and the housing, and the rotating block is mounted on the shaft A spring piece is respectively mounted on both sides of the rotating block, and the top end of the spring piece is in contact with the side of the rotating block, and two grooves are formed on the push-pull rod on the opposite side of the housing, and the shell is opposite to the groove on the push-pull rod There is a groove on the inner side of the body, the groove is divided into three sections, the middle section is lower than the two sides, one end of the rotating block slides in the groove on the casing, and the other end is
  • the displacement of the pump body relative to the pump sleeve is used to realize the switching of liquid suction and liquid discharge, instead of the traditional one-way valve, the defects inherent in the one-way valve are avoided;
  • the amount of each stroke of the metering pump of the present invention is determined by the inner diameter ⁇ of the pump body and the distance of the piston twitching, so The amount of liquid delivered per stroke is fixed, accurate metering is possible, and the entire pump can be made very small, taking the piston diameter of 1 mm as an example.
  • the piston has a stroke of 2 mm, and the suction row is 1.57 microliters; the piston stroke 5 mm, suction 3.97 microliters of liquid, such a small amount of other pumps can not be done, not enough
  • the blind zone of the check valve Therefore, it is the longest aspect of the invention in terms of micro-measurement and dosing;
  • the pump of the present invention is not affected by the impurities in the sample liquid, and the impurities can pass smoothly as long as they do not cause clogging or are stuck.
  • Figure 1 is a cross-sectional view showing a metering pump according to a first embodiment of the present invention.
  • Figure 2 is a cross-sectional view showing a metering pump of Embodiment 3 of the present invention.
  • Figure 3 is a cross-sectional view showing a metering pump and a driving device thereof according to a second embodiment of the present invention.
  • Fig. 4 is a schematic view showing the metering pump and its driving device shown in Fig. 3 in a liquid absorption stroke.
  • Fig. 5 is a schematic view showing the metering pump and its driving device shown in Fig. 3 in a liquid absorption stroke.
  • Figure 6 is a schematic view of the metering pump and its driving device shown in Figure 3 in a draining stroke.
  • Fig. 7 is a schematic view showing the metering pump and its driving device shown in Fig. 3 in a draining stroke.
  • Figure 8 is a schematic view of the metering pump and its driving device shown in Figure 3 in a draining stroke.
  • Figure 9 is a schematic view of the metering pump of the present invention and its driving device.
  • the reference numerals are: 1 is a plunger, 2 is a pump body, 3 is a pump sleeve, 4 is a slider, 5 is a push-pull rod, 6 is a housing, 7 is a rotating block, 8 is a spring piece, 9 is a liquid absorption Hole, 10 is the drain hole, 11 is the guide hole, 12 is the motor, 13 is the runner, 14 is the axle pin, 15 is the sealing strip, 16 is the adjusting screw, 17 is the sealing ring, 18 is the limiting block, 19
  • 20 is a resilient element
  • 21 is a cavity
  • 22 is a groove
  • 23 is a groove.
  • a metering pump including a pump sleeve 3, a pump body 2 slidably mounted in a pump casing 3, and a column 21 mounted in a pump body 2
  • the plug 1 has a flow guiding hole 11 communicating with the cavity 21 on the side wall of the pump body 2, and a liquid suction hole 9 and a liquid discharge hole 10 on the pump sleeve 3, and the liquid suction hole 9 and the liquid discharge hole 10 are in the pump
  • the opening on the inner side of the sleeve 3 is located on the sliding path of the opening of the flow guiding hole 11 on the pump body 2.
  • a metering pump includes a pump sleeve 3, a pump body 2 slidably mounted in the pump casing 3, and a column 21 installed in the pump body 2
  • the plug 1 has a flow guiding hole 11 communicating with the cavity 21 on the side wall of the pump body 2.
  • the opening of the flow guiding hole 11 in the cavity 21 is located at the tail end of the cavity 21, and the liquid is sucked on the pump sleeve 3.
  • the opening of the hole 9 and the liquid discharge hole 10, the liquid suction hole 9 and the liquid discharge hole 10 on the inner side of the pump sleeve 3 are located on the sliding track of the opening of the flow guiding hole 11 on the pump body 2, in order to avoid the flow guiding hole 11 and the pump sleeve 3 Contact is not tight
  • the liquid leakage is caused, and the sealing strip 15 is attached to the two opening positions, respectively, and the sealing strip 15 is mounted on the locus of the sliding of the opening 11 between the openings.
  • the portion of the pump body 2 that slides in the pump casing 3 can be designed as a rectangular parallelepiped or a substantially rectangular parallelepiped.
  • the working process of the metering pump of this embodiment includes a liquid suction stroke and a liquid discharge stroke.
  • the pump body 2 slides from the left end to the right end in the pump casing 3, slides to the flow guiding hole 11 and communicates with the liquid suction hole 9, and then the piston is in the cavity 21
  • the left motion draws the liquid; after the liquid absorption stroke is completed, it is converted into a draining stroke.
  • the pump body 2 slides to the left in the pump sleeve 3, and slides until the air guiding hole 11 communicates with the liquid discharging hole 10. Then, the plunger 1 is moved to the right to push the liquid in the chamber 21 out of the pump body 2.
  • Embodiment 3 of the present invention in order to maintain and adjust the contact portion of the flow guiding hole 11 and the liquid discharging hole 10, the liquid suction hole 9, and the pump casing 3 of the pump body 2
  • the seal between the pump sleeve 3 at the bottom of the pump body 2 and the pump body 2 is provided with an elastic member 20 to provide an elastic force so that the upper portion of the pump body 2 is in close contact with the pump casing 3; and the pump at the bottom of the elastic member 20
  • the sleeve 3 is provided with a threaded hole, and the adjusting screw 16 is installed in the threaded hole.
  • a seal ring 17 may be installed at the outlet on the right side of the pump body 2.
  • the above metering pump can control the plunger 1 and the pump body 2 to move according to a predetermined procedure by controlling a plurality of motoring motors by a PLC, or a driving method as described below.
  • Embodiment 3 of the present invention as shown in FIG. 3, a driving device for driving the above-mentioned metering pump, comprising a housing 6 fixedly coupled with the pump sleeve 3, and a push-pull rod 5 fixed to the pump body 2,
  • the slider 4 is slidably mounted in the housing 6.
  • the tail of the pump body 2 has a limit retaining ring 19, and the limit retaining ring 19 cooperates with the pump sleeve 3 to limit the stroke of the pump body 2 to the left.
  • a limiting block 18 at the right end of the body 6 limits the rightward movement stroke of the push-pull rod 5, and the limiting retaining ring 19 and the limiting block 18 cooperate to limit the sliding stroke of the pump body 2 in the pump sleeve 3; the plunger 1 and the slider 4 fixedly connected together, the push-pull rod 5 is passed through the inside of the slider 4, and the shaft 4 between the push-pull rod 5 and the housing 6 is provided with a shaft on which the rotating block 7 is mounted, on both sides of the rotating block 7 Spring pieces 8 are respectively mounted, and the top end of the spring piece 8 is in contact with the side of the rotating block 7, and two recesses 23 are formed on the push-pull rod 5 on the side opposite to the housing 6, on the inner side of the housing 6 opposite to the recess 23.
  • the groove 22 is divided into three sections, the middle section is lower than the two sides, and one end of the rotating block 7 slides in the groove 22 on the casing 6, and the other end Grooves on the push-pull rod 5 23 and between the two grooves 23;
  • the slider 4 is reciprocated by the motor 12 driven by the interlocking member, which is a runner 13 mounted on the rotating shaft of the motor 12 and mounted on the edge of the runner 13
  • the shaft pin 14 and the other end of the shaft pin 14 are fitted on the slider 4 as shown in FIG.
  • the middle section of the section of the rotating block 7 is rectangular, the ends are triangular, preferably in order to maintain the balance of the force of the push-pull rod 5, the push-pull rod 5 and the rotating block 7 associated therewith are attached to the column.
  • the plug 1 is symmetrically distributed within the housing 6.
  • the motor 12 rotates through the shaft pin 14 at the edge of the runner 13, and the slider 4 is moved to make the slider 4 move linearly in the housing 6.
  • the motor 12 rotates one turn, and the slider 4 travels back and forth to complete a suction. Liquid draining process.
  • the slider 4 In the liquid suction stroke, as shown in FIGS. 3, 4, and 5, the slider 4 is moved to the right, and the two ends of the rotating block 7 mounted on the slider 4 are respectively located in the grooves on the housing 6 and the push-pull rod 5 due to
  • the wheelbase of the left portion of the groove 22 on the casing 6 and the rotating block 7 is small, and the rotating block 7 is not restricted by the left portion of the groove 22 of the casing 6, and is locked in the left groove 23 of the push-pull rod 5.
  • the slider 4 continues to move to the right to move the plunger 1 to the right, the plunger 1 moves relative to the pump body 2, completes the stroke of sucking the liquid, and simultaneously pushes and pulls the rod
  • the left side groove 23 on the 5 pushes the rotating block 7 to rotate, and the end of the rotating block 7 in contact with the push-pull rod 5 slides to the right side groove 23 of the push-pull rod 5, while
  • the spring piece 8 on the left side of the rotating block 7 is pressed, and the rotating block 7 is pressed against the grooves on both sides thereof, and the end of the rotating block 7 in contact with the casing 6 is also slid to the right side of the groove 22;
  • the slider 4 starts to move to the left under the driving of the motor 12, and the rotating block 7 is not restricted by the right segment of the recess 22 of the housing 6, and is stuck on the right side of the push-pull rod 5.
  • One end of the groove 23 pushes the push-pull rod 5 to move to the left, thereby driving the pump body 2 to move to the left along with the plunger 1; as shown in FIG. 7, when the rotating block 7 is in contact with the housing 6, one end slides onto the housing 6.
  • the middle section of the groove 22 since the middle section of the groove 22 is lower than the both sides, the rotation of the rotating block 7 cannot be restricted, and the push-pull rod 5 cannot be moved to the left by the action of the limit retaining ring 19, and the flow guiding hole 11 on the pump body 2 In communication with the drain hole 10, the liquid suction hole 9 is closed by the pump body 2; as shown in Fig.
  • the slider 4 continues to move to the left and the plunger 1 moves to the left, and the plunger 1 moves relative to the pump body 2 to complete the discharge of the liquid.
  • the stroke of the right side of the push rod 5 pushes the rotating block 7 to rotate, and rotates the block 7
  • One end in contact with the push-pull rod 5 slides into the left side groove 23 of the push-pull rod 5, and the end that is in contact with the housing 6 also slides to the left portion of the recess 22 on the housing 6, while rotating the spring piece on the right side of the block 7. 8 is pressed, pressing the rotating block 7 against the grooves on both sides, thereby completing a complete working stroke.
  • the pump head portion can be preferably made of a highly corrosion-resistant material, and the pump can be made resistant to any acid and alkali, any solvent, and has a wide range of uses.
  • the motor 12 of the drive section is preferably controlled by the synchronizing motor 12 for industrial use for continuous online operation.
  • the pump of the present invention is easy to realize multi-channel, multi-pump parallel connection.
  • the amount of the metering pump of the present invention is determined by the distance between the inner diameter of the pump body 2 and the pulsation of the piston, and can be made small, for example, a diameter of 1 mm, the piston has a stroke of 2 mm, and the suction tube is 1.57 ⁇ l. Liquid; piston stroke 5 mm, suction line 3. 93 microliters of liquid, such a small amount of other pumps can not be done, is not enough to overcome the dead zone of the check valve. Therefore, it is the longest aspect of the invention in terms of accurate micro-measurement and dosing.

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

Description

说 明 书
技术领域
本发明涉及一种计量泵及其驱动装置， 具体的说是一种使用柱塞的计量泵 及其驱动装置。
背景技术
计量泵多用于向主要液体介质中注射或抽取定量辅助液体。 例如在仪器仪 表、 自动控制、 化验或小计量加药中的应用。 在这些应用中对计量的要求通常 十分精密， 即便是对于微量的泄露和偏差都十分敏感。 为了满足这一精度要求， 计量泵的密封、 精度和各部件间的配合精度要达到都十分严格标准。
现有的计量泵大致有蠕动泵、 柱塞泵、 隔膜泵、 注射式泵。 其中蠕动泵是 用滚轮转动挤压软管以达到传输液体的目的。 其他几种泵的原理大致相同： 靠 膜片或柱状活塞的往复运动， 在腔体内产生压力或负压， 关闭或开启分别位于 进液口和排液口的两只单向阀完成液体的输送。
在这些现有的计量泵中蠕动泵很难做到微量， 精准， 软管易老化， 耐酸碱 性差， 更不耐溶剂。 而其他的计量泵由于采用单向阀作为泵体内液体通过的启 闭开关， 存在着以下缺点： 首先， 单向阀只有在压力或负压足够大， 要大过单 向阀的弹性回复力后， 才能开启或关闭， 这就形成了一个盲区或叫死角， 这个 盲区对微量取样或加药是不能容忍的； 其次， 两个单向阀处稍有一点杂物便不 能封闭严实， 导致失灵； 第三是进液或出液口若有压力， 会使单向阀被这个压 力左右而失灵。
为此中国实用新型专利 2005201154431公开了一种计量泵， 在泵体内设置有 柱塞套， 柱塞在柱塞套内往复滑动， 柱塞套可以在泵体内相对旋转， 当柱塞套 上的吸入口或输出口旋转至泵体上相应位置时， 实现泵腔与液体输入通道或液 体输出通道之间的连同。 该计量泵可以由于减少了单向阀， 可以避免单向阀的 启闭和密封问题带来的计量偏差。 但是由于该计量泵的柱塞套需要在泵体内旋 转， 因此柱塞套上的液体进、 出口与泵体之间的密封和配合精度要求很高， 加 工难度大， 并且柱塞套上的液体进、 出口在泵体内侧的运动轨迹为一个圆环， 不易于调整密封间隙。 再者由于该计量泵柱塞在一个完整行程内不能将柱塞套 内全部液体输送至外界， 也会因残留的液体导致计量的偏差。
发明内容
本发明的目的在于： 提供一种结构简单， 计量精度高的计量泵及其驱动装 置。
本发明的技术方案是：
一种计量泵， 其特征在于： 该计量泵包括泵套， 可滑动的安装在泵套内的 泵体， 泵体内的腔体中安装有柱塞， 在泵体侧壁上有一个与腔体联通的导流孔， 在泵套上有吸液孔和排液孔， 吸液孔和排液孔在泵套内侧的开口位于导流孔在 泵体上开口的滑动轨迹上。
一种驱动上述计量泵的驱动装置， 其特征在于： 驱动装置包括与泵套固定 连接在一起的壳体， 与泵体固定在一起的推拉杆， 限制泵体滑动行程的限位装 置， 可滑动的安装在壳体内的滑块； 柱塞与滑块固定连接在一起， 推拉杆由滑 块内部穿过， 在推拉杆和壳体之间的滑块上设置有轴， 轴上安装有转动块， 在 转动块两侧分别安装有弹簧片， 弹簧片的顶端与转动块的侧边接触， 在推拉杆 上与壳体相对侧有两个凹槽， 在与推拉杆上的凹槽相对的壳体内侧有一凹槽， 凹槽分为三段， 中间段低于两侧， 转动块的一端在壳体上的凹槽中滑动， 另一 端在推拉杆上的凹槽中和两凹槽之间滑动； 滑块由电机通过联动部件驱动做往 复运动。
本发明的有益效果是：
1、用泵体相对泵套的位移来实现吸液、排液的切换，代替了传统的单向阀， 避免了单向阀固有的诸多缺陷；
2、 与现有依靠测量工作时间与单位时间液体输送量来估算输送量的计量泵 不同， 本发明的计量泵每一个行程输送的量是由泵体内径 Φ与活塞抽动的距离 决定的， 故每一行程输送的液体量是固定的， 能够做到准确计量， 并且整套泵 可以做得很小， 以活塞直径 1毫米为例， 活塞如行程 2毫米， 吸排 1. 57微升液； 活塞行程 5毫米， 吸排 3. 93微升液， 这么小的量其它泵是做不到的， 还不足以克 服单向阀的盲区。 所以在微量计量、 加药方面是本发明最长之处；
3、 本发明的泵不受样液中杂物的影响， 杂物只要不造成堵塞、 不被卡死， 就能顺利通过。
附图说明
图 1是本发明实施例 1的计量泵剖视图。
图 2是本发明实施例 3的计量泵剖视图。
图 3是本发明实施例 2的计量泵及其驱动装置的剖视图。
图 4是图 3所示的计量泵及其驱动装置处于吸液行程的示意图。
图 5是图 3所示的计量泵及其驱动装置处于吸液行程的示意图。
图 6是图 3所示的计量泵及其驱动装置处于排液行程的示意图。
图 7是图 3所示的计量泵及其驱动装置处于排液行程的示意图。
图 8是图 3所示的计量泵及其驱动装置处于排液行程的示意图。
图 9是本发明计量泵及其驱动装置的示意图。
其中， 附图标记： 1为柱塞， 2为泵体， 3为泵套， 4为滑块， 5为推拉杆， 6 为壳体， 7为转动块， 8为弹簧片， 9为吸液孔， 10为排液孔， 11为导流孔， 12为 电机， 13为转轮， 14为轴销， 15为密封条， 16为调节螺钉， 17为密封环， 18为 限位块， 19为限位挡圈， 20为弹性元件， 21为腔体， 22为凹槽， 23为凹槽。 具体实施方式
下面结合附图和实施例对本发明进一歩说明。
本发明的具体实施例 1， 如图 1所示， 一种计量泵， 包括泵套 3， 可滑动的安 装在泵套 3内的泵体 2， 泵体 2内的腔体 21中安装有柱塞 1， 在泵体 2侧壁上有一个 与腔体 21联通的导流孔 11， 在泵套 3上有吸液孔 9和排液孔 10， 吸液孔 9和排液孔 10在泵套 3内侧的开口位于导流孔 11在泵体 2上开口的滑动轨迹上。
本发明的具体实施例 2， 如图 3所示， 一种计量泵， 包括泵套 3， 可滑动的安 装在泵套 3内的泵体 2， 泵体 2内的腔体 21中安装有柱塞 1， 在泵体 2侧壁上有一个 与腔体 21联通的导流孔 11， 导流孔 11在腔体 21内的开口位于腔体 21的尾端， 在 泵套 3上有吸液孔 9和排液孔 10， 吸液孔 9和排液孔 10在泵套 3内侧的开口位于导 流孔 11在泵体 2上开口的滑动轨迹上， 为了避免导流孔 11与泵套 3接触不紧密导 致液体泄露， 在这两个开口位置分别安装有密封条 15， 并且在开口之间导流孔 11滑动的轨迹上安装有密封条 15。
优选地， 为了保持泵体 2在泵套 3内滑动时相对稳定， 可以将泵体 2在泵套 3 内滑动的部分设计为长方体或近似长方体状，
本实施例的计量泵工作过程包括吸液行程， 排液行程。 如图 3、 4、 5所示， 在吸液行程中， 泵体 2由泵套 3内的左端向右端滑动， 滑动至导流孔 11与吸液孔 9 连通， 然后活塞在腔体 21内向左运动抽取液体； 吸液行程完成后， 转换为排液 行程， 如图 6、 7、 8所示， 泵体 2在泵套 3内向左滑动， 滑动直至导流孔 11与排液 孔 10连通， 然后柱塞 1向右移动推动腔体 21内的液体排出泵体 2。
本发明的具体实施例 3， 如图 2所示， 在实施例 2的基础上， 为了保持和调节 导流孔 11和排液孔 10、 吸液孔 9以及泵体 2泵套 3接触部分之间的密封， 在泵体 2 底部的泵套 3和泵体 2之间安装有弹性元件 20， 提供弹性力， 使得泵体 2上部与泵 套 3间贴紧； 并且在弹性元件 20底部的泵套 3上设有螺纹孔， 螺纹孔内安装调节 螺钉 16， 通过调节螺钉 16的行程， 可以实现对弹性力的调节， 从而可以方便的 调节泵体 2和泵套 3上部接触面之间的压力， 保持密封。 另外， 为了增强柱塞 1与 泵体 2之间的密封， 可以在泵体 2右侧的出口处安装密封环 17。
上述的计量泵可以通过 PLC控制多个歩进电机实现柱塞 1、 泵体 2按规定的程 序进行运动， 也可以采用如下文所述的驱动方式。
本发明的具体实施例 3， 如图 3所示， 一种驱动上述计量泵的驱动装置， 包 括与泵套 3固定连接在一起的壳体 6， 与泵体 2固定在一起的推拉杆 5， 可滑动的 安装在壳体 6内的滑块 4， 泵体 2的尾部具有一个限位挡圈 19， 限位挡圈 19与泵套 3配合， 限制泵体 2向左运动的行程， 在壳体 6右端一限位块 18， 限制推拉杆 5的 向右运动行程， 限位挡圈 19和限位块 18配合， 限制泵体 2在泵套 3内的滑动行程； 柱塞 1与滑块 4固定连接在一起， 推拉杆 5由滑块 4内部穿过， 在推拉杆 5和壳体 6 之间的滑块 4上设置有轴， 轴上安装有转动块 7， 在转动块 7两侧分别安装有弹簧 片 8， 弹簧片 8的顶端与转动块 7的侧边接触， 在推拉杆 5上与壳体 6相对侧有两个 凹槽 23， 在与凹槽 23相对的壳体 6内侧有一凹槽 22， 凹槽 22分为三段， 中间段低 于两侧， 转动块 7的一端在壳体 6上的凹槽 22中滑动， 另一端在推拉杆 5上的凹槽 23中和两凹槽 23之间滑动； 滑块 4由电机 12通过联动部件驱动做往复运动， 所述 的联动部件是安装在电机 12转动轴上的转轮 13和安装在转轮 13边缘的轴销 14， 轴销 14的另一端套装在滑块 4上， 如图 9所示。
优选地， 如图 3中所示， 转动块 7的截面中间段为矩形， 两端为三角形 优选地为了保持推拉杆 5的受力平衡， 推拉杆 5及与其相关的转动块 7等附件 关于柱塞 1对称的分布在壳体 6内。
上述驱动装置的工作过程如下：
电机 12转动通过转轮 13边沿的轴销 14， 拨动滑块 4， 使滑块 4在壳体 6内作往 返直线运动， 电机 12转一圈， 滑块 4往返一个来回， 完成了一个吸液排液过程。 吸液行程中， 如图 3、 4、 5所示， 滑块 4向右运动， 安装在滑块 4上的转动块 7两 端分别位于壳体 6和推拉杆 5上的凹槽中， 由于壳体 6上凹槽 22左段与转动块 7的 轴距较小， 转动块 7受到壳体 6上凹槽 22左段的限制无法转动， 卡在推拉杆 5上左 侧凹槽 23中的一端推动推拉杆 5向右运动， 从而带动泵体 2随柱塞 1一同向右运 动； 如图 4所示， 当转动块 7与壳体 6接触一端滑动至壳体 6上的凹槽 22中段， 由 于凹槽 22中间段低于两侧， 不能限制转动块 7转动， 并且推拉杆 5受到限位块 18 的作用无法向右移动， 泵体 2上的导流孔 11与吸液孔 9连通， 排液孔 10被泵体 2封 闭； 如图 5所示，滑块 4继续向右移动带动柱塞 1向右移动， 柱塞 1相对泵体 2运动， 完成吸取液体的行程， 同时推拉杆 5上的左侧凹槽 23推动转动块 7转动， 转动块 7 与推拉杆 5接触的一端滑动至推拉杆 5上右侧凹槽 23中， 同时转动块 7左侧的弹簧 片 8受压， 压紧转动块 7贴紧其两侧的凹槽， 转动块 7与壳体 6接触的一端也滑动 至凹槽 22右段； 而后的排液行程如图 6、 7、 8所示， 滑块 4在电机 12的带动下开 始向左移动， 转动块 7受到壳体 6上凹槽 22右段的限制无法转动， 卡在推拉杆 5上 右侧凹槽 23中的一端推动推拉杆 5向左运动， 从而带动泵体 2随柱塞 1一同向左运 动； 如图 7所示， 当转动块 7与壳体 6接触一端滑动至壳体 6上的凹槽 22中段， 由 于凹槽 22中间段低于两侧， 不能限制转动块 7转动， 并且推拉杆 5受到限位挡圈 19的作用无法向左移动， 泵体 2上的导流孔 11与排液孔 10连通， 吸液孔 9被泵体 2 封闭； 如图 8所示，滑块 4继续向左移动并柱塞 1向左移动， 柱塞 1相对泵体 2运动， 完成排出液体的行程， 同时推拉杆 5上的右侧凹槽 23推动转动块 7转动， 转动块 7 与推拉杆 5接触的一端滑动至推拉杆 5上左侧凹槽 23中， 与壳体 6接触的一端也滑 动至壳体 6上的凹槽 22左段， 同时转动块 7右侧的弹簧片 8受压， 压紧转动块 7贴 紧其两侧的凹槽， 从而完成了一个完整的工作行程。
在上述实施例中， 泵头部分可以优先选用高耐腐蚀材料制作， 可以使本泵 耐任何酸碱、 任何溶剂， 使其具有广泛的用途。 驱动部分的电机 12优选用同歩 电机 12控制， 便于工业上用于在线连续工作。 本发明的泵易实现多通道、 多泵 并联。
本发明的计量泵每一个行程输送的量是由泵体 2内径与活塞抽动的距离决 定的， 可以做得很小， 以直径 1毫米为例， 活塞如行程 2毫米， 吸排 1. 57微升液; 活塞行程 5毫米， 吸排 3. 93微升液， 这么小的量其它泵是做不到的， 还不足以克 服单向阀的盲区。 所以在准确微量计量、 加药方面是本发明最长之处。

Claims

权 利 要 求 书
1. 一种计量泵， 其特征在于： 该计量泵包括泵套， 可滑动的安装在泵套内的泵 体， 泵体内的腔体中安装有柱塞， 在泵体侧壁上有一个与腔体联通的导流孔， 在泵套上有吸液孔和排液孔， 吸液孔和排液孔在泵套内侧的开口位于导流孔在 泵体上开口的滑动轨迹上。
2. 根据权利要求 1所述的计量泵， 其特征在于， 导流孔在腔体内的开口位于腔 体的尾端。
3. 根据权利要求 1所述的计量泵， 其特征在于， 在吸液孔和排液孔在泵套内侧 的开口处安装有密封圈， 在吸液孔和排液孔在泵套内侧的开口之间的泵套内侧 安装有密封条。
4. 根据权利要求 1所述的计量泵， 其特征在于， 在腔体内壁和柱塞之间安装有 密封环。
5. 根据权利要求 1所述的计量泵， 其特征在于， 在吸液孔和排液孔在泵套内侧 开口的对侧的泵体和泵套之间安装有弹性元件。
6. 根据权利要求 5所述的计量泵， 其特征在于， 在弹性元件的底部的泵套上设 有螺纹孔， 螺纹孔内安装有调节螺钉。
7. 一种驱动上述计量泵的驱动装置， 其特征在于： 驱动装置包括与泵套固定连 接在一起的壳体， 与泵体固定在一起的推拉杆， 限制泵体滑动行程的限位装置， 可滑动的安装在壳体内的滑块； 柱塞与滑块固定连接在一起， 推拉杆由滑块内 部穿过， 在推拉杆和壳体之间的滑块上设置有轴， 轴上安装有转动块， 在转动 块两侧分别安装有弹簧片， 弹簧片的顶端与转动块的侧边接触， 在推拉杆上与 壳体相对侧有两个凹槽， 在与推拉杆上的凹槽相对的壳体内侧有一凹槽， 凹槽 分为三段， 中间段低于两侧， 转动块的一端在壳体上的凹槽中滑动， 另一端在 推拉杆上的凹槽中和两凹槽之间滑动； 滑块由电机通过联动部件驱动做往复运 动。
8. 根据权利要求 7所述的驱动装置， 其特征在于， 所述的联动部件是安装在电 机转动轴上的转轮和安装在转轮边缘的轴销， 轴销的另一端套装在滑块上。
9. 根据权利要求 7所述的驱动装置， 其特征在于， 所述推拉杆有两根， 关于柱 塞对称分布。
10. 根据权利要求 7所述的驱动装置， 其特征在于， 转动块的截面中间段为矩 形， 两端为三角形。
PCT/CN2008/071796 2008-04-30 2008-07-29 计量泵及其驱动装置 WO2009132494A1 (zh)

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CN105561833A (zh) * 2016-02-04 2016-05-11 天津璞誉环保科技开发有限公司 一种洗地车清洗液的混合装置

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ES2386839T3 (es) 2012-09-03
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