CN111173726A - Method for detecting micro-flow injection pump - Google Patents

Abstract

The invention discloses a method for detecting a micro-flow syringe pump, which comprises the steps of respectively connecting a detected syringe pump and a standard syringe pump with the input end of a float flowmeter through a conduit; selecting a plurality of flow points to be tested on the float flowmeter, and marking an error line corresponding to each flow point; starting a standard injection pump, adjusting the flow of the standard injection pump to a set value, enabling a floater on a floater flow meter to reach the position of a set flow point, recording the adjusting position of the standard injection pump at the moment, and then closing the standard injection pump; adjusting the detected injection pump to the same adjusting position as the standard injection pump, and recording the position of a floater on a floater flowmeter and the position relation of the floater and an error line; repeating the verification until all the flow points are tested; and judging the qualified condition of the injection pump to be detected according to the test results of all the flow points. The invention can solve the problems of long verification time, large error and difficult verification of the micro-flow injection pump in the prior art, and has high efficiency and simple structure.

Description

Method for detecting micro-flow injection pump

Technical Field

The invention relates to the technical field of medical equipment maintenance, in particular to a micro-flow injection pump calibration method.

Background

The micro flow generally refers to the flow less than 100ml/min, and the micro flow syringe pump is an instrument with a given micro flow and is widely applied to the fields of medical appliances, biology, pharmacy, genetic engineering and the like. In the biological, pharmaceutical and chemical fields, the liquid micro flow is used for dosing such as catalysts and the like, and in the medical field, the micro liquid flow directly concerns the life safety and the body health of patients, such as medical injection pumps, anesthesia machines and the like.

The micro-flow injection pump needs to be calibrated according to a specified period aiming at different application scenes. The existing detection method mainly adopts a weighing method, namely, the injection flow is accumulated and weighed within a specified time, and the flow rate is converted. The main problems and defects are that the verification efficiency is low, and the weighing needs a long enough time equivalent to reduce the verification error; and the error source is complicated, the weighing and verification time is long, the liquid evaporation error which is not negligible can be brought, and in addition, the temperature and the pressure have larger influence than the common flow.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the method for calibrating the micro-flow injection pump, which can solve the problems of long calibration time, large error and difficult calibration of the micro-flow injection pump in the prior art.

In order to solve the technical problems, the invention adopts the following technical scheme:

the method for calibrating the micro-flow injection pump comprises the following steps:

s1, connecting the tested injection pump and the standard injection pump with the input end of the float flowmeter through a conduit respectively;

s2, selecting a plurality of flow points to be tested on the float flowmeter, and marking an error line corresponding to each flow point;

s3, starting the standard injection pump, adjusting the flow of the standard injection pump to a set value, enabling the floater on the floater flow meter to reach the set flow point position, recording the adjusting position of the standard injection pump at the moment, and then closing the standard injection pump;

s4, adjusting the detected injection pump to the same adjusting position as the standard injection pump, and recording the position of the float on the float flowmeter and the position relation with the error line;

s5, repeating S3 and S4 until the test is finished for all the flow points;

and S6, judging the qualified condition of the tested injection pump according to the test results of all the flow points.

Further, the float flow meter comprises a first float flow meter connected with the tested syringe pump and a second float flow meter connected with the standard syringe pump.

Further, the length of the conduit between the syringe pump to be tested and the first float flowmeter is the same as the length of the conduit between the label syringe pump and the second float flowmeter.

Further, the syringe pump under test, the float flow meter, the label syringe pump and the second float flow meter are in the same environment.

Further, the detected injection pump and the labeling injection pump are connected with the float flowmeter through a three-way valve.

Further, when the detected injection pump and the labeled injection pump respectively work, the pipeline corresponding to the injection pump which does not work is closed through the three-way valve.

Further, there are 10 flow points to be tested, 5, 15, 20, 50, 150, 200, 400, 600, 800, 1000, unit mL/h, respectively.

Further, the error line is ± 5% of the flow point to be tested.

Further, the test is performed at least three times for each flow point.

Further, the method for judging the qualification of the tested injection pump comprises the following steps:

when the floats of the float flowmeters corresponding to the detected injection pump in all the test results are within the range between the error lines of the same flow point, the detected injection pump is qualified; and when the floater is positioned outside the error line at least once, the detected injection pump is unqualified.

The method for calibrating the micro-flow injection pump provided by the invention has the main beneficial effects that:

compared with the existing weighing method, the invention can obviously improve the verification efficiency by verifying through the flowmeter, the weighing method needs longer weighing time to meet the requirement of verification precision, and the stabilization time of the floater in the method is far shorter than the time required by the weighing method, thereby greatly shortening the verification time.

Meanwhile, the required equipment is simplified, the source of detection errors is reduced, and compared with the errors of evaporation, temperature, pressure and the like caused by a weighing method which needs a long time, liquid in the method is in a closed pipeline, so that the influence of the evaporation errors can be ignored. And the detection time is short, so that the error influence of temperature and pressure can be greatly weakened.

Drawings

FIG. 1 is a flow chart of the present invention.

Fig. 2 is a schematic view of the connection relationship when there is only one float flowmeter.

Fig. 3 is a schematic view showing a connection relationship when there are two float flow meters.

The device comprises a tested injection pump 1, a standard injection pump 2, a standard injection pump 3, a float flowmeter 31, a first float flowmeter 32, a second float flowmeter 4 and a three-way valve.

Detailed Description

The invention will be further described with reference to the accompanying drawings in which:

fig. 1 is a flow chart of a method for calibrating a micro-flow syringe pump.

The method for calibrating the micro-flow injection pump comprises the following steps:

and S1, connecting the tested injection pump 1 and the standard injection pump 2 with the input end of the float flowmeter 3 through a conduit respectively.

Specifically, the number of float flow meters 3 may be one or two.

When the float flow meters 3 are two in number, as shown in fig. 3, the float flow meters 3 include a first float flow meter 31 connected to the syringe pump 1 to be tested and a second float flow meter 32 connected to the standard syringe pump 2.

At this time, the length of the pipe between the syringe pump 1 to be tested and the first float flow meter 31 is the same as the length of the pipe between the label syringe pump 2 and the second float flow meter 32. And the syringe pump 1 under test, the first float flow meter 31, the label syringe pump 2 and the second float flow meter 32 are in the same environment.

When the number of float flow meters 3 is one, as shown in fig. 2, the syringe pump 1 to be tested and the label syringe pump 2 are connected to the float flow meters 3 through a three-way valve 4. At this time, when the subject syringe pump 1 and the label syringe pump 2 are operated, the line corresponding to the inoperative syringe pump is closed by the three-way valve 4.

S2, selecting a plurality of flow points to be tested on the float flowmeter 3, and marking an error line corresponding to each flow point.

Specifically, the number of flow points to be tested is 10, which are 5, 15, 20, 50, 150, 200, 400, 600, 800 and 1000 in mL/h. The error line is typically + -5% of the flow point to be tested, and may be + -2%.

And S3, starting the standard injection pump 2, adjusting the flow of the standard injection pump 2 to a set value, enabling the floater on the floater flow meter 3 to reach the set flow point position, recording the adjusting position of the standard injection pump 2 at the moment, and then closing the standard injection pump 2.

When only one float flowmeter 3 is needed, the standard injection pump 2 is closed, and then the three-way valve is adjusted to the float flowmeter 3 to be communicated with the injection pump 1 to be detected.

And S4, adjusting the detected injection pump 1 to the same adjusting position as the standard injection pump 2, and recording the position of the float on the float flowmeter 3 and the position relation with the error line.

The position of the float in the syringe pump 1 being examined may be recorded by photographing, video recording, etc. for later processing and analysis.

When only one float flowmeter 3 is needed, the three-way valve is adjusted to the float flowmeter 3 to be communicated with the standard injection pump 2 after the injection pump 1 to be detected is closed.

S5, repeat S3 and S4 until the test is completed for all flow points.

In order to ensure the accuracy of the test, the test of each flow point is carried out at least three times. Each flow point can be tested typically 6 times to ensure data accuracy.

And S6, judging the qualified condition of the injection pump 1 to be tested according to the test results of all the flow points.

Specifically, the method for determining the qualification of the syringe pump 1 to be tested includes:

when the floats of the float flow meters 3 corresponding to the detected injection pump 1 in all the test results are within the range between the error lines of the same flow point, the detected injection pump 1 is qualified; when the float is located outside the error line at least once, the syringe pump 1 to be tested is rejected and needs to be corrected.

The above description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.

Claims (10)

1. A method for calibrating a micro-flow injection pump is characterized by comprising the following steps:

s1, connecting the tested injection pump and the standard injection pump with the input end of the float flowmeter through a conduit respectively;

s2, selecting a plurality of flow points to be tested on the float flowmeter, and marking an error line corresponding to each flow point;

s3, starting the standard injection pump, adjusting the flow of the standard injection pump to a set value, enabling the floater on the floater flow meter to reach the set flow point position, recording the adjusting position of the standard injection pump at the moment, and then closing the standard injection pump;

s4, adjusting the detected injection pump to the same adjusting position as the standard injection pump, and recording the position of the float on the float flowmeter and the position relation with the error line;

s5, repeating S3 and S4 until the test is finished for all the flow points;

and S6, judging the qualified condition of the tested injection pump according to the test results of all the flow points.

2. The method of calibrating a micro flow syringe pump as claimed in claim 1, wherein the float flow meter comprises a first float flow meter connected to the syringe pump under test and a second float flow meter connected to a standard syringe pump.

3. The method for calibrating a micro flow syringe pump according to claim 2, wherein the length of the conduit from the syringe pump to be tested to the first float flow meter is the same as the length of the conduit from the label syringe pump to the second float flow meter.

4. The method of calibrating a micro flow syringe pump of claim 2, wherein the syringe pump under test, the float flow meter, the label syringe pump and the second float flow meter are in the same environment.

5. The method for calibrating a micro flow syringe pump as claimed in claim 1, wherein the syringe pump to be tested and the label syringe pump are connected to a float flow meter through a three-way valve.

6. The method for calibrating a micro flow rate injection pump according to claim 5, wherein when the injection pump to be tested and the labeled injection pump respectively work, the pipeline corresponding to the injection pump which does not work is closed through a three-way valve.

7. The method for calibrating a micro flow injection pump according to claim 4 or 6, wherein the flow rate points to be tested are 10, 5, 15, 20, 50, 150, 200, 400, 600, 800 and 1000 in mL/h.

8. The method of calibrating a micro flow syringe pump as claimed in claim 7, wherein the error line is ± 5% of the flow point to be tested.

9. The method of claim 7, wherein the testing is performed at least three times for each flow point.

10. The method for calibrating a micro-flow syringe pump according to claim 1, wherein the method for determining the qualification of the syringe pump to be tested comprises:

when the floats of the float flowmeters corresponding to the detected injection pump in all the test results are within the range between the error lines of the same flow point, the detected injection pump is qualified; and when the floater is positioned outside the error line at least once, the detected injection pump is unqualified.

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