CN102953965A - High-voltage and constant-current pump using electronic cam technique to realize constant-current liquid conveying function - Google Patents
High-voltage and constant-current pump using electronic cam technique to realize constant-current liquid conveying function Download PDFInfo
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- CN102953965A CN102953965A CN2012104182368A CN201210418236A CN102953965A CN 102953965 A CN102953965 A CN 102953965A CN 2012104182368 A CN2012104182368 A CN 2012104182368A CN 201210418236 A CN201210418236 A CN 201210418236A CN 102953965 A CN102953965 A CN 102953965A
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Abstract
The invention discloses a high-voltage and constant-current pump using an electronic cam technique to realize a constant-current liquid conveying function. The high-voltage and constant-current pump comprises two sets of pump units and one set of control circuit, wherein each set of pump unit comprises a pump head, the inside of a pump cavity of each pump head is provided with a plunger rod, a sealing ring is arranged between each plunger rod and the wall of each pump cavity, the outside of one end of each plunger rod extending out of each pump cavity is sheathed with a plunger mounting sleeve, the other end of each plunger mounting sleeve is provided with a screw rod, one end of each screw rod, near each plunger mounting sleeve, is sheathed with a slide assembly, each plunger mounting sleeve is fixedly connected with each slide assembly, the other end of each screw rod is connected with a stepping motor through a coupling, each stepping motor is connected with a driver, a control program is set in a control circuit, and the control end of the control circuit is in controlled connection with each driver of each pump unit. The high-voltage and constant-current pump has the advantages that the running of the stepping motors is controlled by programs; the action of a cam on each plunger rod is simulated by a transmission mechanism, so the dependence of the system on the structure design is greatly reduced, and meanwhile the property index of the liquid conveying is improved.
Description
Technical field
The invention belongs to piston pump with constant flow, relate to a kind of high pressure constant flow pump that utilizes the electric cam technology to reach the constant current infusion function, be applicable to the analytic type high performance liquid chromatograph, also can be used in the suitable constant current transfusion environment of other liquid properties, flow and pressure range.
Background technique
Liquid chromatography technology becomes one of the most frequently used analytical method in laboratory with its adaptability widely.The instrument of its test is high performance liquid chromatograph, and high pressure constant flow pump is a core component of high performance liquid chromatograph.The steady degree of high pressure constant flow pump transfusion directly affects the analysis repeatability of a whole set of instrument and minimum detectable level etc.
Existing high-pressure service pump as shown in Figure 1, 2, all is under the elastic force effect of spring 8, by the circular movement of cam 2, drives the to-and-fro motion about plunger rod 3 is done, to change the volume of pump cavity 4.When plunger rod moved right, one-way valve 5 unlatchings, 6 were closed, and liquid is inhaled into pump cavity 4; When plunger rod during to left movement, one-way valve 6 opens, 5 close, and liquid is pushed out pump cavity 4, reaches the effect of external stable transfusion, and when the radiuses of 2 this moments of cam became large rule and meets constant velocity spiral and require, output liquid reached the constant current requirement.Formed thus the constant current output of half period.In parallel when the such plunger pump of two-way, and the sequential of externally infusing is when differing half period, and the two-way pump theory of composition is to reach external constant current transfusion of complete period, such as Fig. 2.
But in actual the use, really not so.At first: in the high pressure constant flow pump that uses mechanical cam, in two pump chambers are externally infused alternation procedure, can not reach the transition that does not have pulsation, the real work principle of the parts such as one-way valve in the taking into account system, can't eliminate by optimizing the cam curve method on this pulsation theory, greatly affect the pressure stability of high-pressure service pump, thereby reduced the repeatability and the minimum detectable level of having raised system of system testing.Secondly, the phase difference between single cam design curve and two cams is in case determine, and is namely definite by the plunger rod stroke of its drive, when flow velocity is adjusted on a large scale, can only pass through the flow of the speed adjustment system of cam, in the low speed situation, can pulse by further intensified pressure like this.
Summary of the invention
The invention provides a kind of high pressure constant flow pump that utilizes the electric cam technology to reach the constant current infusion function, the present invention utilizes the operation of program control stepper motor, pass through driving mechanism, the simulation cam is to the effect of plunger rod, reach with programmed method and realize the different requirements that require high voltage and constant current output, give full play to the advantage of mcu programming, greatly reduced the dependence of system to structural design, improved simultaneously the performance index of transfusion.
The present invention adopts following technological scheme:
Utilize the electric cam technology to reach the high pressure constant flow pump of constant current infusion function, it is characterized in that: include two cover pump unit, one cover control circuit, described every cover pump unit includes stepper motor, screw mandrel, slide block assembly, pump head, seal ring, plunger rod, include pump cavity on the described pump head, be provided with plunger rod in the pump cavity, be provided with seal ring between the wall of plunger rod and pump cavity, the end outer cover that plunger rod stretches out pump cavity is equipped with a plunger installation sleeve, the other end of described plunger installation sleeve is equipped with screw mandrel, screw mandrel is set with slide block assembly near an end of plunger installation sleeve, be fixedly connected with between plunger installation sleeve and the slide block assembly, the other end of screw mandrel connects with stepper motor by a coupling, stepper motor is connected with driver, the slide block assembly outside is equipped with the bearing pack of guiding, described plunger installation sleeve, slide block assembly, the coupling outer cover is equipped with one and drives cavity, drive the guiding groove that has two symmetries on the inwall of cavity, bearing pack upper, lower two ends lay respectively in two guiding grooves; The built-in control program of described control circuit, the control end of control circuit is connected with the driver control of each pump unit respectively, the infusion connector of pump head comprises an input interface and an output interface in described each pump unit, and be provided with an one-way valve in each interface, the input interface of each pump head is in parallel by the low pressure threeway, output interface is in parallel by Highpressure Tee, the 3rd port of low pressure threeway connects solvent bottle, and the 3rd port of Highpressure Tee is as the delivery outlet of a whole set of pump; In described every cover pump unit, stepper motor is under the plug-in control of control circuit, driving corresponding screw mandrel rotates by preset program, and then drive screw mandrel top slide block assembly carries out linear reciprocating motion by preset program, the continuous plunger rod of screw mandrel also carries out linear reciprocating motion by preset program simultaneously thus, so that external constant current is infused halftime, constant current imbibition halftime in each operation period of pump head.
Described stepper motor and screw mandrel combination consist of electric cam.
The built-in control program of described control circuit includes electric cam motion speed, direction and stroke, and the parameter of built-in control program can be regulated in real time.
Also include limit assembly, limit assembly includes a restraining groove, position-limited lever, and an end of position-limited lever is fixedly connected with slide block assembly, and the other end stretches in the restraining groove.
The liquid road input interface of all pump unit links to each other by the low pressure threeway and receives simultaneously solvent bottle, outputs to the rear class parts of high performance liquid chromatograph after output interface connects by Highpressure Tee.
Beneficial effect of the present invention is:
The present invention utilizes the operation of program control stepper motor, pass through driving mechanism, the simulation cam is to the effect of plunger rod, reach with programmed method and realize the different requirements that require high voltage and constant current output, given full play to the advantage of mcu programming, greatly reduce the dependence of system to structural design, improved simultaneously the performance index of transfusion.
Description of drawings
Fig. 1 is the structural representation of existing high-pressure service pump.
Fig. 2 is the schematic diagram of the cam of existing high-pressure service pump.
Fig. 3 is the side view of pump of the present invention unit.
Fig. 4 is the plan view of pump of the present invention unit.
Fig. 5 is the schematic diagram of embodiments of the invention.
Embodiment
Embodiment:
The present invention adopts two cover pump unit, sets motion speed and the direction of stepper motor by plug-in, and simulation two-way phase difference is 180 ° of mechanical cam functions, drives the plunger rod to-and-fro motion, reaches the constant current effect.Because the two-way motor can independently control, for the pulsation that two pump chambers are externally infused and produced in the alternation procedure, can do in advance algorithm control, reach and greatly reduce the effect of pulsing.Simultaneously because the two-way motor can independent programming Control, in the maximum plunger stroke, can adjust arbitrarily the stroke size, can realize under the same alternating frequency, the output of rill speed reaches and reduces the effect of pulsing under the low speed.
Concrete scheme is as follows:
Shown in Fig. 3,4: stepper motor 9 links to each other with screw mandrel 7 by coupling 8, and when stepper motor 9 rotated, screw mandrel 7 can rotate synchronously with identical angular velocity.There is the internal thread supporting with screw mandrel 7 slide block assembly 6 inside, the bearing pack 12 of guiding is equipped with in slide block assembly 6 outsides, and outside driving cavity 13 both sides have guiding groove, after the normal assembling, bearing pack 12 is moved in guiding groove always, guarantees that slide block assembly 6 can not rotate.When screw mandrel 7 operation, under the bearing pack effect of guiding, the gap that disappears slide block assembly 6 can move about the view direction of Fig. 3, under slide block assembly 6, screw mandrel 7, coupling 8, the acting in conjunction rotation of stepper motor 9 is converted to the straight line motion of the gap slide block assembly 6 that disappears.
The metal seat of plunger rod 4 is fixed on the gap slide block assembly 6 that disappears by plunger installation sleeve 3, and the jewel bar of plunger rod 4 is partly packed in the pump cavity of pump head 1, reaches sealing effect by seal ring 2.Pump head 1 built-in input output one-way valve, when plunger rod 4 is done left and right sides to-and-fro motion, after pump head connects solvent bottle, can the periodicity output liquid.When slide block assembly 6 moves right, drive plunger rod 4 and move right synchronously, the internal capacity that reaches seal ring 2 left sides, pump head 1 diminishes, and under the effect of pump head internal one-way valve, pump head 1 sucks liquid from the outside.When the gap slide block assembly 6 that disappears during to left movement, drive plunger rod 4 synchronously to left movement, the internal capacity that reaches seal ring 2 left sides, pump head 1 diminishes, under the effect of pump head internal one-way valve, pump head 1 external constant current output liquid.
Master control borad 11 plug-ins, by the motion of driver 10 control step motors 9, built-in program can be controlled stepper motor 9 operations, reaches the motions such as plunger rod 4 at the uniform velocity advances, at the uniform velocity retreats, lifting speed, and the stroke that can advance, retreat by programming.
The foundation of master control borad 11 plug-ins control motor operation mainly is following curvilinear equation;
According to this equation, the flow that can draw output liquid is even output during in 10 °＜ω≤175 °, and ° 0 °＜ω≤170 are the output of slowing down ° for accelerating output in the time of 175 °＜ω≤185 °.According to different strokes and flow velocity demand, equation 1 can configure different parameters, reaches user's specific requirement.
As shown in Figure 5, when being comprised of No. 2 pump unit, the liquid road input interface of all pump unit links to each other by the low pressure threeway and receives simultaneously solvent bottle, outputs to the rear class parts of high performance liquid chromatograph after output interface connects by Highpressure Tee.For the high voltage and constant current pumping system that No. 2 pump unit form, master control borad 11 synchronization control No. 2 pump unit, 180 ° of the electric cam phase phase differences of pump unit A, B are all continued to use, and whenever the external transfusion of pump all is the effect of constant current after reaching stack.
Claims (4)
1. high pressure constant flow pump that utilizes the electric cam technology to reach the constant current infusion function, it is characterized in that: include two cover pump unit, one cover control circuit, described every cover pump unit includes stepper motor, screw mandrel, slide block assembly, pump head, seal ring, plunger rod, include pump cavity on the described pump head, be provided with plunger rod in the pump cavity, be provided with seal ring between the inwall of plunger rod and pump cavity, the end outer cover that plunger rod stretches out pump cavity is equipped with a plunger installation sleeve, the other end of described plunger installation sleeve is equipped with screw mandrel, screw thread is equipped with slide block assembly on the screw mandrel, be fixedly connected with between plunger installation sleeve and the slide block assembly, the other end of screw mandrel connects with stepper motor by a coupling, stepper motor is connected with driver, the slide block assembly outside is equipped with the bearing pack of guiding, described plunger installation sleeve, slide block assembly, the coupling outer cover is equipped with one and drives cavity, drive the guiding groove that has two symmetries on the inwall of cavity, bearing pack upper, lower two ends lay respectively in two guiding grooves; The built-in control program of described control circuit, the control end of control circuit is connected with the driver control of each pump unit respectively, the infusion connector that leads to pump cavity in described each pump unit on the pump head comprises an input interface and an output interface, and be provided with an one-way valve in each interface, the input interface of each pump head is in parallel by a low pressure threeway, output interface passes through a Highpressure Tee parallel connection, and the 3rd port of low pressure threeway connects solvent bottle; In described every cover pump unit, stepper motor is under the plug-in control of control circuit, driving corresponding screw mandrel rotates by preset program, and then drive screw mandrel top slide block assembly carries out linear reciprocating motion by preset program, the continuous plunger rod of screw mandrel also carries out linear reciprocating motion by preset program simultaneously thus, so that external constant current is infused halftime, constant current imbibition halftime in each operation period of pump head.
2. the high pressure constant flow pump that utilizes the electric cam technology to reach the constant current infusion function according to claim 1 is characterized in that: described stepper motor and screw mandrel combination, formation electric cam.
3. the high pressure constant flow pump that utilizes the electric cam technology to reach the constant current infusion function according to claim 1 and 2, it is characterized in that: the built-in control program of described control circuit includes electric cam motion speed, direction and stroke, and the parameter of built-in control program can be regulated in real time.
4. the high pressure constant flow pump that utilizes the electric cam technology to reach the constant current infusion function according to claim 1, it is characterized in that: also include limit assembly, limit assembly includes a restraining groove, position-limited lever, one end of position-limited lever is fixedly connected with slide block assembly, and the other end stretches in the restraining groove.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012104182368A CN102953965A (en) | 2012-10-25 | 2012-10-25 | High-voltage and constant-current pump using electronic cam technique to realize constant-current liquid conveying function |
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| CN2012104182368A CN102953965A (en) | 2012-10-25 | 2012-10-25 | High-voltage and constant-current pump using electronic cam technique to realize constant-current liquid conveying function |
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| CN102953965A true CN102953965A (en) | 2013-03-06 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104454488A (en) * | 2013-09-18 | 2015-03-25 | 贵州中烟工业有限责任公司 | Plunger pump, plunger pump volume efficiency measuring method and plunger stroke adjusting method |
| CN106762512A (en) * | 2017-01-14 | 2017-05-31 | 东莞市聚瑞电气技术有限公司 | A kind of new construction small-sized plunger pump |
| CN107377306A (en) * | 2017-08-18 | 2017-11-24 | 桂林航天电子有限公司 | Adjustable encapsulating controlling organization |
| CN107956663A (en) * | 2017-12-04 | 2018-04-24 | 厦门博士达涂装科技有限公司 | It is a kind of that there is the two-cylinder type plunger pump for stablizing output |
| CN108799045A (en) * | 2018-07-31 | 2018-11-13 | 江苏钧微动力科技有限公司 | A kind of vector controlled pump |
| CN113357119A (en) * | 2021-07-19 | 2021-09-07 | 无锡易福高压清洗设备有限公司 | Single-cylinder crankshaft-free servo plunger pump and module thereof |
| CN114607578A (en) * | 2022-04-06 | 2022-06-10 | 苏州博睿嘉晟医疗科技有限公司 | Novel directly drive high pressure constant flow pump |
| CN114992077A (en) * | 2022-08-08 | 2022-09-02 | 中石化胜利石油工程有限公司钻井工艺研究院 | Reciprocating pump |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104454488A (en) * | 2013-09-18 | 2015-03-25 | 贵州中烟工业有限责任公司 | Plunger pump, plunger pump volume efficiency measuring method and plunger stroke adjusting method |
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| CN106762512A (en) * | 2017-01-14 | 2017-05-31 | 东莞市聚瑞电气技术有限公司 | A kind of new construction small-sized plunger pump |
| CN107377306A (en) * | 2017-08-18 | 2017-11-24 | 桂林航天电子有限公司 | Adjustable encapsulating controlling organization |
| CN107956663A (en) * | 2017-12-04 | 2018-04-24 | 厦门博士达涂装科技有限公司 | It is a kind of that there is the two-cylinder type plunger pump for stablizing output |
| CN108799045A (en) * | 2018-07-31 | 2018-11-13 | 江苏钧微动力科技有限公司 | A kind of vector controlled pump |
| CN113357119A (en) * | 2021-07-19 | 2021-09-07 | 无锡易福高压清洗设备有限公司 | Single-cylinder crankshaft-free servo plunger pump and module thereof |
| CN114607578A (en) * | 2022-04-06 | 2022-06-10 | 苏州博睿嘉晟医疗科技有限公司 | Novel directly drive high pressure constant flow pump |
| CN114992077A (en) * | 2022-08-08 | 2022-09-02 | 中石化胜利石油工程有限公司钻井工艺研究院 | Reciprocating pump |
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Application publication date: 20130306 |