JPS58126489A - Pump - Google Patents

Abstract

PURPOSE:To transfer a liquid simply and surely at a desired and corrected flow quantity by applying a processing function, and a measuring function of the flow to a liquid transfer pump. CONSTITUTION:Pulses of different numbers per predetermined time are fed to a pulse motor 14 in sequence to transfer liquid in accordance with a program stored in a control section 17 beforehand, and the flow quantity of the transfer liquid at different number of pulses per predetermined time is measured by means of a mesuring section 11, a calibration curve is generated from the relatioship between the number of pulses and the measured data of the flow quantity of the transfer liquid and is stored in memory beforehand, and the number of pulses per predetermined time to be fed to the pulse motor 14 is determined from the desired flow quantity of the transfer liquid input from an input section by using the above calibration curve. Accordingly, an extremely correct flow quantity of the pump transfer liquid can be available, and also the operation is performed automatically under the control of a control section 17, thereby the handling of the pump can be simplfied.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a constant flow foot pump, and more specifically to a constant flow pump having an internal flow source calibration function.

Conventionally, there is a plunger pump that pumps liquid at a predetermined flow rate. However, the liquid feeding gong changes due to temperature, viscosity, leakage due to wear of the sealing member, fluctuations in load pressure, etc., and is not constant. In the past, to deal with fluctuations in flow rate, the pump's discharge amount was actually measured, the deviation from the target value was found from this, and the flow adjustment screws, etc. installed on the pump were repeatedly adjusted as appropriate. . However, in the case of the above method,
In general, the minus part of the flow rate requires a lot of reliance on intuition and takes time. In addition, a relationship between the actual measured value of the flow rate and the scale (calibration [1N) is created in advance, and this calibration curve is used to determine the flow rate of the pump. However, when using this method, as mentioned above, the calibration curve changes every time the fluid to be delivered, temperature, viscosity, etc. change, and therefore it is necessary to recreate the calibration curve each time, which is still complicated. It is.

The present invention has been made to improve the above-mentioned situation, and by providing a liquid feeding pump with an arithmetic processing function and a flow rate metering function, a pump that easily and reliably feeds liquid at a desired calibrated flow rate can be created. The purpose is to provide.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In the figure, reference numeral 1 denotes a pump head attached to a substrate 2, in which a passage 3 for transporting liquid is perforated in the vertical direction.

In the lower part of this passage 3, a lower check valve consisting of a valve seat 4 and a ball 5 is interposed, and a suction part 6 is installed, and in the upper part of the passage 3, an upper check valve consisting of a valve seat 7 and a ball 8 is installed. A discharge portion 9 is formed by interposing.

A pumping cylinder hole 10 is bored in the pump head 1 with an upward slope toward the passage 3, and
The passage 3 and the pumping cylinder bore 10 communicate within the pump head 1 .

One end of a plunger 11 is inserted into the cylinder hole 10 with a packing 12 interposed therebetween in a fluid-tight manner and slidable in the axial direction thereof.

Further, a cylindrical rack 13 is attached to the other end of the plunger 11. The rack 13 is meshed with a pinion 16 attached to the rotating shaft 15 of the pulse motor 140, and the rotational motion of the rotating shaft 150 is converted into linear interlocking motion by the pinion 16 and the rack 13, and is transmitted to the plunger 11. Plunger 11 is cylinder hole 1
The liquid is sucked into the cylinder from the suction part 6 and discharged from the discharge part 9 via the upper check valve. 17
is a control unit that is equipped with an input unit that receives input from the outside, and executes various calculations and controls based on external human power according to a pre-installed program. The rotation direction and rotation angle of the pulse motor 14 are controlled.

One end of a discharge pipe 18 is connected to the discharge part 9,
As a result, a discharge side flow path is formed, and the liquid to be sent is pumped through this pipe 18.

This discharge pipe 18 is provided with a three-way solenoid valve 19 whose flow path switching is controlled by the control section 17 .

One end of a branch pipe 20 is connected to the solenoid valve 19, and the other end is disposed within a metering pipe 22 of a metering section 21,
This forms a metering section flow path. The measuring tube 2
2, a transparent cylinder is vertically installed, and a pair of first cylinders are installed at predetermined intervals along the outer circumferential wall of the cylinder.
~Fourth light emitting section 23a-a and first to fourth light receiving sections 24a~
d are arranged to face each other, and each of the light emitting parts 23a to 23d
The light receiving sections 24a facing each other detect changes in the amount of light emitted by the
-d detects it and sends it to the control unit to control the metering tube 2.
Detect the liquid level position within 2.

Next, a case will be described in which the pump is used to send liquid at a predetermined flow rate.

First, when a desired liquid feeding flow rate is inputted from the input section of the control section 17 and a start button (not shown) is pressed, a control program incorporated in the control section 17 is started and preparations for calibration are performed. That is, a signal is sent from the control section 17 to the three-way solenoid valve 19 to switch the flow path of the solenoid valve 19 to the needle groin flow path, and at the same time, the control section 17 sends a signal to the three-way solenoid valve 19 to change the number of pulses per predetermined time to the pulse motor 14 (see FIG. At , a pulse of ft ) is sent.

Then, the pump 14 generates the number of pulses (fl) per predetermined time.
The liquid is delivered at a flow rate corresponding to (V in FIG. 2), and the delivered liquid is delivered to the discharge pipe 18, the three-way valve 19,
It is discharged into a metering tube 22 through a branch pipe 20. As a result, the liquid level in the metering tube 22 rises, and when the liquid level exceeds the first light receiving part 24a disposed at the bottom, the opposing first light receiving part 24a rises.
The amount of light reaching the first light receiving section 24a from the light emitting section 23a changes. This change in magnetism is detected by the first light receiving section 24a and a detection signal is sent to the control section 17, and the number of pulses required for liquid feeding from this time until the liquid level exceeds the second light receiving section 24b is determined by the control section 17. It is measured in Then, based on the volume of the metering tube between the first light receiving section 24a and the second light receiving section 24b, which is determined in advance by actual measurement, and the number of actually measured pulses required to fill this volume, the pump's liquid delivery flow rate is determined. The value is calculated by the control unit 17, and the liquid feeding flow rate ■1 for the number of pulses f1 per predetermined time
is stored in the memory of the control unit 17.

Next, a pulse train with a different number of pulses per predetermined time (a second
In the figure, f2) is connected to the pulse motor 14 from the control unit 17.
The number of pulses required for the liquid level to reach from the third light receiving section 240 to the fourth light receiving section 24 (i) is measured in the same manner as described above, and from this, the number of pulses f per predetermined time is determined in the same way.
The liquid feeding flow rate ■2 for 2 is calculated and stored in the memory. Next, check *? using the flow rate value. fM is created and stored in memory.

Thereafter, using the calibration curve stored in the memory of the control unit 17, the value of the desired liquid feeding flow rate inputted first from the input unit is calculated from the initially inputted liquid feeding flow rate (in FIG.
The number of pulses per predetermined time (fa in FIG. 2) corresponding to 3) is calculated, and this number of pulses is sent to the pulse motor 14, so that a desired flow rate of liquid is delivered.

In the pump of this embodiment, according to a program pre-installed in the control unit 17, pulses with different numbers of pulses per predetermined time are sequentially sent to the pulse motor 14 to perform liquid feeding, and at the same time, pulses with different numbers of pulses per predetermined time are sequentially sent to the pulse motor 14. The liquid feeding flow rate at the number of pulses is actually measured using the metering section, a calibration curve is created from the relationship between these pulse numbers and the measured liquid feeding flow rate, and stored in memory in advance. Since the number of pulses per predetermined time to be sent to the pulse motor 14 is determined from the fluid flow rate value using the calibration curve, the fluid flow rate of the pump is extremely accurate, and these operations are controlled. Since this is done automatically under the control of section 17, handling of this pump is extremely simple. The pulse motor 14 is used as a drive source, and its rotary motion is converted into linear motion by the rack 13 and pinion 16, and this is directly transmitted to the plunger 11, which simplifies the structure. Since the movement is digitized, the pump has high liquid delivery accuracy. Furthermore, since the cylinder hole 10 is formed with an upward slope, there is no possibility that air bubbles may be mixed in or generated for some reason and remain in the cylinder hole 10, thereby affecting the liquid flow rate.

In the above embodiment, the measuring tube 22 was used to measure the volume of the liquid to be fed when measuring the flow rate of the liquid to be fed, but the present invention is not limited to this. For example, a weight sensor or the like may be used to measure the weight of the liquid to be fed. Furthermore, the driving source of the plunger 11 is not limited to the pulse motor 14, and various known driving sources can be used.Furthermore, although the cylinder hole 10 is also formed with an upward slope, it is not limited to this, and other aspects of the invention may be used. Various changes may be made without departing from the gist.

The pump of the present invention has an input section that inputs input from the outside to the arithmetic processing section, and performs various calculations and calculations based on the input from the outside.
A control unit that performs control, a liquid feeding pump whose liquid feeding flow rate is controlled by a control amount signal sent from the control unit, and a liquid feeding pump that is located in a discharge side flow path of the liquid feeding pump and that is controlled by a signal from the control unit. A flow path switching valve that switches between the flow path and the flow path in the first part;
It consists of a measuring section that returns the obtained measured value to the control section,
When sending liquid, the switching valve is switched from the discharge side flow path to the i-section flow path in advance according to a signal from the control unit, and then the control unit sequentially sends control amount signals to the liquid sending pump to operate the liquid sending pump. At the same time, the liquid feeding flow values of the liquid feeding pumps that operate in response to the sequentially different control amount signals sent out are respectively *+°
Measure in the m section and send the measured values to the control section.The control section creates a calibration curve from these controlled variables and the meter values, temporarily stores it in a memo in the control section, and then The switching valve is switched from the partial flow path to the discharge side flow path according to a signal from the control section, and the liquid feeding flow rate inputted from the input section is converted into a control amount using the above-mentioned detection line M. Since the control volume signal is sent to the liquid sending pump to calibrate the liquid sending flow rate, the liquid feeding accuracy is extremely high, and all of these calibration operations are performed automatically, making it easy to handle. It has features such as being simple.

[Brief explanation of the drawing]

It is a graph showing a relationship. 1...Pump head, 6...Suction part, 9...
・Discharge part, 14... Pulse motor, 17... Control part, 19... Three-way solenoid valve 120... Branch pipe,
21... Gauge lug part, 22... Measuring tube. 1

Claims (1)

[Claims] /, an input section for inputting input from the outside section to the arithmetic processing section;
There is a control unit that performs various calculations and controls based on input from the outside, a liquid delivery pump whose liquid delivery flow rate is controlled by a control amount signal sent from the control unit, and a flow path on the discharge side of the liquid delivery pump. A flow path switching valve that switches between the discharge side flow path and the needle groin flow path based on a signal from the control section, and a flow path switching valve that is connected to the metering section flow path and controls the liquid feeding flow rate of the liquid feeding pump by u [and the obtained meter value. It consists of an itt part that returns the amount of water to the control part, and after switching the switching valve from the discharge narrow flow path to the meter lid part flow path in advance according to a signal from the control part when sending liquid, a large control amount signal is sequentially sent from the ttilJ control part. The liquid is sent to the liquid feeding pump to operate the liquid feeding pump, and the liquid feeding flow rate of the liquid feeding pump that is activated in response to the sent out sequentially larger control tht signal is measured in each of the four parts, and the value is added to the total. is sent to the control section, the control section creates an inspection*iIM from these control section and needle values, temporarily stores it in the memory within the control section, and then switches the switching valve to the metering section flow according to the signal from the control section. At the same time, the fluid flow rate input from the input section is converted to the control section using the calibration curve, and the converted control amount signal is sent to the fluid pump to control its delivery. A pump characterized in that it is configured to calibrate a liquid flow rate. 2. The pump according to claim 1, wherein the liquid feeding pump is driven by a pulse motor.