CN213478626U - Accurate quantitative control system of peristaltic pump - Google Patents
Accurate quantitative control system of peristaltic pump Download PDFInfo
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- CN213478626U CN213478626U CN202020895795.8U CN202020895795U CN213478626U CN 213478626 U CN213478626 U CN 213478626U CN 202020895795 U CN202020895795 U CN 202020895795U CN 213478626 U CN213478626 U CN 213478626U
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Abstract
The utility model relates to a peristaltic pump accurate quantitative control system, the system includes driver, pump head, pipeline auto-change over device, measurement pipeline and discharge line, be provided with the elastic hose in the pump head, the exit end and the pipeline auto-change over device of elastic hose are connected; the driver drives the pump head to operate, and liquid in the pipeline is pumped to the outlet end of the elastic hose; the driver is electrically connected with the pipeline switching device and can control the pipeline switching device to switch the outlet end of the elastic hose to be communicated with the metering pipeline or the discharge pipeline; in response to the drive pump head being operated to a predetermined starting position by the drive, the drive line switching means switches the outlet end of the flexible hose from being in communication with the bleed line to being in communication with the metering line. The embodiment of the utility model provides an accurate ration of peristaltic pump is carried, but has simple structure, quantitative accurate high, continuous operation, conveying efficiency height, with low costs and the wide advantage of adaptability.
Description
Technical Field
The utility model belongs to the technical field of the peristaltic pump, concretely relates to accurate quantitative control system of peristaltic pump.
Background
A peristaltic pump generally comprises a drive (not shown), a pump head 101 and an elastic hose 102, as shown in fig. 1. When the peristaltic pump works, the elastic hose 102 is filled with the liquid 103, the roller 104 in the pump head 101 is driven by the driver through the shaft rod 108 to rotate, the plurality of rollers 105 on the periphery of the roller 104 alternately press and release the elastic hose 102 towards the hose pressing block 106 in sequence during the rotation of the roller, so that negative pressure is formed in the elastic hose 102, and the liquid 103 is pumped. Compared with other pumps, the peristaltic pump has the characteristics of good controllability, no pollution, cleanness, certain transmission precision and the like, is widely applied to various fields of biology, environmental protection, chemical industry, pharmacy, laboratories, intelligent manufacturing and the like at present, and has huge market prospect.
Among them, liquid quantitative filling is one of the main applications of peristaltic pumps. The existing peristaltic pump quantitative distribution function obtains approximately the same distribution liquid amount by controlling the motor to rotate for the same number of turns.
However, the peristaltic pump has a pulsation phenomenon during the operation, and when the outlet end of the hose squeezing component (generally called a roller or a rotor in the field of peristaltic pumps according to different characteristics) leaves the working surface, the hose squeezing component suddenly and instantly releases the occupied volume, so that the liquid flow at the outlet end is instantly reduced. And, the larger the inner diameter of the hose is, the larger the encroachment volume of one hose squeezing component on the hose is, and the more obvious the flow pulsation phenomenon generated at the outlet end is. The peristaltic pump is started according to a task each time, the position of a hose extrusion point is not fixed, and pulsation phenomenon exists, so that under the condition of fixed rotating speed, the liquid amount transmitted in the same time interval has the deviation of the volume occupied by a hose extrusion component on a hose. Therefore, the larger the inner diameter of the hose, the larger the error in liquid amount distribution.
In the prior art, in order to ensure the precision of quantitative distribution of a peristaltic pump, a hose with a smaller inner diameter is selected conventionally. However, the method has the problems that the same liquid amount is transmitted, the number of rotation turns of the hose with a smaller pipe diameter needs to be increased, the filling time is prolonged, the efficiency is reduced, the extrusion frequency of the hose is increased, the service life of the hose is obviously shortened, and the quantitative transmission stability of the peristaltic pump is reduced.
The problems can be solved by a linear peristaltic pump product on the market at present, rotary motion of the linear peristaltic pump is changed into single-stroke repeated linear motion with adjustable stroke, and accurate quantification of the liquid distribution amount can be realized. However, the linear peristaltic pump has a complex structure, high cost, long return time and poor universality, and cannot continuously work.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems that the position of a hose extrusion point is not fixed and the quantitative error caused by the pulsation phenomenon is larger when the peristaltic pump is started according to a task each time, the embodiment of the utility model provides an accurate quantitative control system of the peristaltic pump, which comprises a driver, a pump head, a pipeline switching device, a metering pipeline and a discharge pipeline,
an elastic hose is arranged in the pump head, and the outlet end of the elastic hose is connected with a pipeline switching device;
the pipeline switching device can switch the outlet end of the elastic hose to be communicated with the metering pipeline or the discharge pipeline;
the driver drives the pump head to operate, and liquid in the pipeline is pumped to the outlet end of the elastic hose; the driver is electrically connected with the pipeline switching device and can control the pipeline switching device to switch the output pipeline communicated with the outlet end of the elastic hose;
in response to the drive pump head being operated to a predetermined starting position by the drive, the drive line switching means switches the outlet end of the flexible hose from being in communication with the bleed line to being in communication with the metering line.
Furthermore, the accurate quantitative control system of the peristaltic pump further comprises an input pipeline which is communicated with the inlet end of an elastic hose in the pump head.
Further, the drain line communicates with the input line, and can form a return passage from the outlet end of the elastic hose to the input line.
Further, the driver responds to a quantitative output starting signal or a quantitative output ending signal, drives the pump head to operate to a preset starting position, and then drives the pipeline switching device to switch the outlet end of the elastic hose from a state of being communicated with the discharge pipeline to a state of being communicated with the metering pipeline.
Further, the accurate quantitative control system of the peristaltic pump further comprises a position detection device capable of detecting whether the pump head operates to a preset initial position, and the driver is electrically connected with the position detection device to acquire a position detection signal whether the pump head operates to the preset initial position.
Further, the driver comprises a control panel and a motor, and the control panel is respectively connected with the motor, the position detection device and the pipeline switching device;
the position detection device is arranged on the motor or the pump head or a connecting piece of the motor and the pump head.
Further, position detection device includes magnetic inductor and magnet steel, the magnetic inductor is connected with the driver electricity, sets up the back play axle of motor can detect the rotation of magnet steel.
Further, the pump head has at least one roller on the roller, and the position detecting means is capable of detecting whether any one of the rollers has operated to a predetermined start position.
The utility model has the advantages that: the embodiment of the utility model provides an accurate quantitative control system of peristaltic pump when having kept the original clean of peristaltic pump, easily maintaining, advantages such as the controllability is good, has realized the accurate ration of peristaltic pump and has simple structure, the ration is accurate high, can continuous operation, transport efficiency height, with low costs and the wide (be applicable to multiple pump head) advantage of adaptability. The accurate quantitative control system of peristaltic pump sets up pipeline auto-change over device and discharge line on current peristaltic pump basis, through judging the running position of pump head, starts pipeline auto-change over device in good time and switches over the connecting channel, has realized the discharge of liquid at the pump head adjustment in-process to and realized that the pump head initial position when the ration output liquid of every time is identical, eliminated the quantitative transmission error that the pulsation phenomenon produced, the repeatability is high.
Drawings
FIG. 1 is a schematic diagram of the construction of a prior art peristaltic pump;
fig. 2 is a schematic structural diagram of a peristaltic pump accurate quantitative control system according to an embodiment of the present invention;
fig. 3 is a schematic circuit connection diagram of a peristaltic pump accurate quantitative control system according to an embodiment of the present invention;
fig. 4 is a flow chart of the operation of the peristaltic pump accurate quantitative control system of the embodiment of the present invention;
fig. 5 is a schematic view of the liquid flow of the peristaltic pump accurate quantitative control system of the embodiment of the present invention during discharge;
fig. 6 is a schematic diagram of the liquid flow of the peristaltic pump accurate quantitative control system of the embodiment of the present invention during quantitative output;
fig. 7 is a schematic structural diagram of a precise quantitative control system of a peristaltic pump according to another embodiment of the present invention;
FIG. 8 is a schematic view of the flow of liquid during discharge from a peristaltic pump accurate dosing control system in accordance with yet another embodiment of the present invention;
fig. 9 is a flowchart of the accurate quantitative control method for the peristaltic pump according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that the present invention is not limited to the drawings and the following embodiments.
The embodiment of the utility model provides an accurate quantitative control system of peristaltic pump, as shown in figure 1, accurate quantitative control system of peristaltic pump includes driver 1, input pipeline 6, pump head 2, pipeline auto-change over device 4, measurement pipeline 3 and discharge line 5.
An elastic hose (not shown) is arranged in the pump head 2, the inlet end of the elastic hose in the pump head 2 is communicated with the input pipeline 6, and the outlet end of the elastic hose is connected with the pipeline switching device 4. Those skilled in the art will understand that the flexible hoses in the input pipeline 6 and the pump head 2 may be a single pipeline, or may be multiple pipelines connected to each other; the outlet end of the flexible hose may be connected to the line switching device 4 through another connection pipe.
The pipeline switching device 4 can switch the outlet end of the elastic hose to be communicated with the metering pipeline 3 or the discharge pipeline 5. The line switching device 4 may be a line switching device such as a rotary valve, a pinch valve, an isolation valve, a switching valve, a solenoid valve, and a diaphragm valve.
The drive 1 drives the pump head 2 to rotate, so that the hose pressing member in the pump head 2 rotates to alternately press and release the elastic hose in the pump head 2 in turn, thereby forming a negative pressure in the elastic hose to pump the liquid from the input line 6 to the outlet end of the elastic hose. The driver 1 is electrically connected with the pipeline switching device 4, and the driver 1 controls the pipeline switching device 4 to switch the output pipeline communicated with the outlet end of the elastic hose, so that the outlet end of the elastic hose is communicated with the metering pipeline 3 or the discharge pipeline 5.
The drive 1 drives the pump head 2 to a predetermined starting position and then drives the line switching means 4 to switch the outlet end of the flexible hose from communicating with the discharge line 5 to communicating with the metering line 3. Preferably, the drive unit 1 drives the pump head 2 to a predetermined start position in response to a start signal or an end signal of the metered output, and then drives the line switching device 4 to switch the outlet end of the flexible hose from being in communication with the discharge line 5 to being in communication with the metering line 3. It will be appreciated by those skilled in the art that the pump head 2 may be driven to a predetermined starting position at any time after one metered output and before the next metered output, and the line switching means 4 may then be driven to switch the outlet end of the flexible hose from communicating with the discharge line 5 to communicating with the metering line 3.
Specifically, the accurate quantitative control system for the peristaltic pump further comprises a position detection device for detecting whether the pump head 2 is operated to a preset starting position. The position detecting means may be disposed on the motor, the pump head or a connecting member of the motor and the pump head, the driver 1 is electrically connected to the position detecting means to obtain a position detecting signal indicating whether the pump head 2 is operated to a predetermined starting position, specifically, the roller of the pump head 2 has at least one roller (refer to fig. 1), and the position detecting means detects whether any one of the rollers is operated to the predetermined starting position.
In a preferred embodiment of the present invention, the position detecting device includes a magnetic inductor and a magnetic steel, and the magnetic induction chip is disposed at the rear portion of the motor and electrically connected to the driver 1; the magnet steel sets up the back play axle of motor, the rotation that the magnet steel can be detected to the magnetic inductor. Therefore, in the rotating process of the rotating hose extruding component, the magnetic steel on the motor rotates along with the rotating hose extruding component, the electric signal of the magnetic inductor changes, and whether the pump head 2 is operated to the preset initial position or not can be determined based on the comparison with the electric signal threshold value of the magnetic induction chip at the preset initial position.
In another preferred embodiment of the present invention, the position detecting device comprises a hall sensor, which is disposed on a fixed hose pressing member (such as a hose pressing block in fig. 1) of the pump head 2 and electrically connected to the driver 1; magnetic steel is arranged near the edge of the rotating hose pressure part (e.g. the roller in fig. 1) of the pump head 2, for example on at least one of the rollers. Of course, when the rollers are made of steel, magnetic steel is not required. Therefore, in the rotating process of the rotating hose extrusion part, the magnetic steel/steel material roller on the rotating hose extrusion part can be in reciprocating close to or far away from the Hall sensor on the fixed hose extrusion part, the electric signal of the Hall sensor can be changed, and whether the pump head 2 is operated to the preset initial position or not can be determined based on the comparison with the electric signal threshold value of the Hall sensor at the preset initial position.
Further, the position detection device may be a photoelectric detection device, a proximity switch, a reed switch, or the like.
The circuit connection schematic diagram of the peristaltic pump accurate quantitative control system of the embodiment of the present invention is shown in fig. 3. The driver 1 includes a control board, a motor, and a position detecting device, and the position detecting device is disposed on the motor and used for detecting a rotation position of a motor shaft. The control panel is respectively connected with the motor, the position detection device and the pipeline switching device 4. The control panel controls the motor to start, and drives the pump head to output a fixed amount of liquid; and the control board controls the pipeline switching device 4 to switch the pipelines according to the instruction.
The utility model discloses accurate ration control system of peristaltic pump is when carrying out fluid ration output, as shown in figure 4, including following step:
the driver 1 acquires a position detection signal and determines whether the pump head 2 is operating to a predetermined start position. Wherein the actuator 1 acquires a position detection signal from a position detection means which detects whether the pump head 2 is operating to a predetermined starting position. Preferably, the driver 1 acquires a position detection signal in response to the constant volume output start signal or the constant volume output end signal, and determines whether the pump head 2 is operating to a predetermined start position. It will be understood by those skilled in the art that the actuator 1 can acquire a position detection signal at any time after one fixed-quantity output and before the next fixed-quantity output to determine whether the pump head 2 is operating to a predetermined starting position.
In response to the pump head 2 not operating to a predetermined starting position, the driver 1 controls the line switching device 4 such that the outlet end of the elastic hose communicates with the discharge line 5, while the outlet end of the elastic hose does not communicate with the metering line 3, as shown in fig. 5; the drive 1 controls the pump head 2 to continue to run towards the predetermined starting position. In the process, the liquid which is discharged from the flexible tube in the pump head 2 is discharged via the discharge line 5.
In response to the pump head 2 being in a predetermined starting position, the driver 1 controls the line switching device 4 such that the outlet end of the flexible hose is in communication with the metering line 3, while the outlet end of the flexible hose is not in communication with the discharge line 5, as shown in fig. 6. The drive 1 can thus control the operation of the drive pump head 2 to deliver a fixed amount of liquid.
The peristaltic pump repeats the above process each time the liquid is quantitatively delivered.
Based on the above description, those skilled in the art will appreciate that the peristaltic pumps described in the embodiments of the present invention include, but are not limited to, rotary peristaltic pumps, piano type peristaltic pumps, and linear peristaltic pumps.
Therefore, the utility model discloses accurate ration control system of peristaltic pump sets up pipeline auto-change over device and the pipeline of releasing on current peristaltic pump basis, and through the running position who judges the pump head, in good time start pipeline auto-change over device switches over the connection route, has realized releasing of liquid in pump head accommodation process to and the pump head initial position when having realized quantitative output liquid at every turn is identical, has eliminated the quantitative transmission error that pulsation phenomenon produced, and the repetition precision is high.
The utility model discloses still another embodiment provides an accurate quantitative control system of peristaltic pump, as shown in fig. 7, fig. 8, it is different with the previous embodiment, pipeline 5 and the 6 intercommunication of input tube way of bleeding can form the follow the exit end of elastic hose is to the backward flow route of input tube way 6 to can make the liquid reflux that the peristaltic pump was bled to input tube way 6, improve liquid utilization, avoid the contaminated risk after liquid was bled through the pipeline of bleeding simultaneously.
The embodiment of the utility model provides a still provide an accurate quantitative control method of peristaltic pump, when carrying out fluid ration output, as shown in figure 9, include following step:
acquiring a position detection signal, and judging whether the pump head operates to a preset initial position; preferably, the position detection signal is acquired in response to the quantitative output start signal or the quantitative output end signal, and whether the pump head is operated to the predetermined start position is determined. Those skilled in the art will appreciate that the position detection signal can be obtained at any time after one quantitative output and before the next quantitative output to determine whether the pump head is operating to a predetermined starting position;
in response to the pump head not operating to the predetermined starting position, placing the outlet end of the flexible hose of the peristaltic pump in communication with the discharge line, controlling the pump head to operate to the predetermined starting position, during which the liquid output from the flexible hose in the pump head 2 is discharged through the discharge line 5;
in response to the pump head being in the predetermined starting position, the outlet end of the flexible tube of the peristaltic pump is brought into communication with the metering line, thereby enabling the operation of the drive pump head 2 to deliver a metered quantity of liquid.
Preferably, the liquid discharged through the discharge line flows back to the input of the peristaltic pump.
The utility model discloses an accurate quantitative control method of peristaltic pump, through the running position who judges the pump head, the connecting channel of the exit end of in good time adjustment peristaltic pump elastic hose has realized the release of liquid in pump head accommodation process to and the pump head initial position when having realized quantitative output liquid at every turn is identical, has eliminated the quantitative transmission error that pulsation phenomenon produced, and the repetition accuracy is high.
The embodiment of the present invention further provides a storage medium, in which a computer program for executing the foregoing method is stored.
The embodiment of the present invention further provides a processor, which runs a computer program for executing the method as described above.
In order to verify the utility model discloses peristaltic pump accurate quantitative control system and control method's technological effect, the utility model people has carried out following test:
1. an experimental instrument: the existing peristaltic pump, the utility model discloses the peristaltic pump, YZ15 pump head (be suitable for 13#, 14#, 17# hose, flow range 3-990mL/min), YT25 pump head (be suitable for 15#, 24#, 35# hose, flow range 50-1600mL/min), YZ25 pump head (be suitable for 15#, 24# hose, flow range 50-990mL/min), high accuracy electronic balance (precision 0.0001g), 13# silica gel elastic hose (wall thickness 1.7mm, internal diameter 0.8mm), 14# silica gel elastic hose (wall thickness 1.7mm, internal diameter 1.6mm), 15# silica gel elastic hose (wall thickness 2.4mm, internal diameter 4.8mm), 17# silica gel elastic hose (wall thickness mm, internal diameter mm), 24# silica gel elastic hose (wall thickness 2.4mm, internal diameter 6.4mm), 35# silica gel elastic hose (wall thickness 2.4mm, internal diameter 7.9mm), 19# silica gel elastic hose (wall thickness 1.6mm), Inner diameter 2.4mm), solenoid valve;
2. and (3) testing conditions are as follows: at normal temperature and normal pressure, water is used as a transmission medium, and the lengths of an input pipeline and an output pipeline of the peristaltic pump are both 0.5 m;
3. the calculation method comprises the following steps: four sets of experiments were performed under each experimental condition, respectively, to obtain filling data (where comparative example data was measured at the outlet end of the peristaltic pump flexible hose and example data was measured at the outlet end of the metering line), and to record motor speed, filling time, absolute error, and error rate, where:
absolute error is maximum-minimum;
error rate is absolute error/mean.
Test data sheet
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A precise and quantitative control system of a peristaltic pump is characterized by comprising a driver (1), a pump head (2), a pipeline switching device (4), a metering pipeline (3) and a discharge pipeline (5),
an elastic hose is arranged in the pump head (2), and the outlet end of the elastic hose is connected with a pipeline switching device (4);
the pipeline switching device (4) can switch the outlet end of the elastic hose to be communicated with the metering pipeline (3) or the discharge pipeline (5);
the driver (1) drives the pump head (2) to operate, and liquid in the pipeline is pumped to the outlet end of the elastic hose; the driver (1) is electrically connected with the pipeline switching device (4) and can control the pipeline switching device (4) to switch the output pipeline communicated with the outlet end of the elastic hose;
in response to the driver (1) driving the pump head (2) to operate to a predetermined starting position, the drive line switching means (4) switches the outlet end of the flexible hose from communicating with the discharge line (5) to communicating with the metering line (3).
2. A system for accurate dosing control of a peristaltic pump as claimed in claim 1, further comprising an inlet line (6) communicating with the inlet end of an elastic hose in the pump head (2).
3. A system for the precise dosing control of a peristaltic pump according to claim 2, wherein the discharge line (5) is in communication with the input line (6) and is capable of forming a return path from the outlet end of the flexible hose to the input line (6).
4. A precise dosing control system for a peristaltic pump as claimed in claim 1, wherein the actuator (1) is adapted to actuate the pump head (2) to the predetermined start position in response to a dosing start signal or a dosing end signal, and to subsequently actuate the line switching means (4) to switch the outlet end of the flexible hose from being in communication with the discharge line (5) to being in communication with the metering line (3).
5. A peristaltic pump precise quantitative control system according to claim 1, further comprising position detection means capable of detecting whether the pump head (2) is operated to a predetermined start position, wherein the driver (1) is electrically connected to the position detection means to obtain a position detection signal whether the pump head (2) is operated to the predetermined start position.
6. A precise and quantitative control system of a peristaltic pump according to claim 5, characterized in that said driver (1) comprises a control board and a motor, said control board being connected to the motor, the position detection means and the line switching means (4), respectively;
the position detection device is arranged on the motor or the pump head (2) or a connecting piece of the motor and the pump head (2).
7. The precise and quantitative control system of a peristaltic pump according to claim 6, characterized in that said position detection means comprise a magnetic sensor and magnetic steel, said magnetic sensor being electrically connected to said actuator (1) and being arranged at the rear output shaft of said motor to be able to detect the rotation of the magnetic steel.
8. A system for precise dosing control of a peristaltic pump as claimed in claim 5, wherein the rollers of the pump head (2) have at least one roller thereon, and wherein the position sensing means is capable of sensing whether any of the rollers has moved to a predetermined starting position.
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| CN202020895795.8U CN213478626U (en) | 2020-05-25 | 2020-05-25 | Accurate quantitative control system of peristaltic pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114352507A (en) * | 2021-12-16 | 2022-04-15 | 龙镎 | Continuous precision metering fluid pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114352507A (en) * | 2021-12-16 | 2022-04-15 | 龙镎 | Continuous precision metering fluid pump |
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