CN111351729A - Method for rapidly detecting cleanliness and water content of pipeline - Google Patents
Method for rapidly detecting cleanliness and water content of pipeline Download PDFInfo
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- CN111351729A CN111351729A CN202010168319.0A CN202010168319A CN111351729A CN 111351729 A CN111351729 A CN 111351729A CN 202010168319 A CN202010168319 A CN 202010168319A CN 111351729 A CN111351729 A CN 111351729A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
- G01N5/025—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content for determining moisture content
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
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Abstract
The invention relates to a method for rapidly detecting the cleanliness and the water content of a pipeline, which comprises the following steps: s1, flushing the pipeline by adopting monofluorodichloroethane immiscible with water, and collecting the monofluorodichloroethane after flushing by using a filter cup; s2, allowing the monofluorodichloroethane in the filter cup to flow into the liquid collecting cup through the first filter paper and the sand core filter head, and keeping impurities and water on the upper surface of the first filter paper; s3, weighing the qualitative filter paper, absorbing water left on the first filter paper and on the wall of the collecting container through the qualitative filter paper, weighing the qualitative filter paper after water absorption again, and subtracting the weight of the qualitative filter paper before water absorption from the weight of the qualitative filter paper after water absorption to obtain the water content in the pipeline; the first filter paper with the impurities remaining is weighed, and the weight of the first filter paper body is subtracted from the obtained weight, thereby obtaining the weight of the impurities. The invention has the advantage of shortening the detection time.
Description
Technical Field
The invention relates to a method for rapidly detecting the cleanliness and the water content of a pipeline, which is suitable for detecting the water content and the cleanliness in an unused pipeline.
Background
Each part of the automobile air conditioner is generally dispersedly arranged at each part of the automobile, and the parts are connected together by an automobile air conditioner pipeline to form a set of complete automobile air conditioning system.
The processing of the automobile air conditioner pipeline comprises the following steps: blanking, chamfering, heading, rolling groove, necking, cleaning, bending, welding, gluing, marking, O-shaped ring assembling, valve core assembling, liquid sight lens assembling, pressure switch assembling, tightness detecting, blow-drying, pressure switch detecting, support assembling, pipe type checking, O-shaped ring oiling, accessory installing, labeling, full-detection dotting, packaging and warehousing.
When a customer uses the pipeline to install the machine, the pipeline needs to be vacuumized. In the above-mentioned pipe processing process, although there is a subsequent drying process after cleaning the pipe, the pipe is bent, and thus, it is not possible to ensure complete drying of the inside of the pipe. If the water content in the pipeline is too high, the customer can not completely pump out during vacuumizing and can not fill the refrigerant.
The water content in the pipeline is detected by adopting a Karl Fischer tester at present, although the Karl Fischer test method has the advantage of accurate detection, the Karl Fischer detection consumes long time, and the Karl Fischer tester needs higher cost.
In addition, in the process of processing the pipeline, a small amount of impurities (fiber yarns, metal chips and the like) enter the pipeline, and the Karl Fischer test method can only detect the water content, but cannot detect the impurities. Therefore, the existing detection method can only separately detect the water content and the impurities, and obviously, the existing detection method can prolong the detection time. Through calculation, the detection time of one pipeline is more than 3 hours.
Disclosure of Invention
The invention provides a method for rapidly detecting the cleanliness and the water content of a pipeline, which can shorten the detection time.
The technical scheme for solving the technical problems is as follows:
the method for rapidly detecting the cleanliness and the water content of the pipeline comprises the following steps:
s1, flushing the pipeline by adopting monofluorodichloroethane immiscible with water, so that the water and impurities remained in the pipeline move along with the monofluorodichloroethane, and collecting the monofluorodichloroethane after flushing by using a filter cup;
s2, after the first filter paper which is not hydrophilic is weighed, the first filter paper is assembled at the input end of the sand core filter head, the output end of the sand core filter head is connected with the liquid collection cup, the input end of the sand core filter head is connected with the filter cup, the filter tip on the sand core filter head is connected with a vacuum pump, the vacuum pump works, the fluorodichloroethane in the filter cup flows into the liquid collection cup through the first filter paper and the sand core filter head, and impurities and water are reserved on the upper surface of the first filter paper;
s3, weighing the qualitative filter paper, absorbing water left on the first filter paper and on the wall of the collecting container through the qualitative filter paper, weighing the qualitative filter paper after water absorption again, and subtracting the weight of the qualitative filter paper before water absorption from the weight of the qualitative filter paper after water absorption to obtain the water content in the pipeline; the first filter paper with the impurities remaining is weighed, and the weight of the first filter paper body is subtracted from the obtained weight, thereby obtaining the weight of the impurities.
The method is characterized in that the pipe is washed by adopting monofluorodichloroethane (HCFC-141b), oil stains or dirt can be dissolved by the monofluorodichloroethane, and water and the monofluorodichloroethane are not mutually soluble, so that in the process of filtering the solution in a subsequent filter cup, water and impurities can be remained on the first filter paper by combining the first filter paper which is not hydrophilic, and the water and the cleaning agent are separated in the filtering stage, and the impurities and the cleaning agent are separated in the filtering stage, so that the monofluorodichloroethane does not contain water after filtering, and further, the water and the cleaning agent are not required to be separated by adopting another method or means.
According to the method, water and impurities are simultaneously separated from the cleaning agent during filtering, only qualitative filter paper is needed to be adopted to absorb the water subsequently to separate the water from the impurities, the water content in the pipeline can be calculated through weighing, and the first filter paper is weighed to obtain the weight of the impurities.
The invention has the beneficial effects that: by adopting the method, the whole detection time is controlled within 30 minutes, and compared with the Karl Fischer detection method adopted in the prior art, the method provided by the invention has the advantage that the detection efficiency is improved.
Detailed Description
Example 1
The method for rapidly detecting the cleanliness and the water content of the pipeline comprises the following steps:
s1, flushing the pipeline with monofluorodichloroethane (HCFC-141b) insoluble in water to make the water and impurities in the pipeline move with the monofluorodichloroethane, and collecting the monofluorodichloroethane after flushing with a filter cup.
In the process, 500ml of monofluorodichloroethane is adopted to flush the pipeline, and the dosage of the monofluorodichloroethane is adjusted according to the length of the pipe fitting. The pipeline is preferably flushed by a siphon method.
The timing of S1 was timed, and the time required for S1 was 5 minutes as indicated by the timing results.
S2, after the first piece of non-hydrophilic filter paper is weighed, the first piece of filter paper is assembled at the input end of the sand core filter head, the output end of the sand core filter head is connected with the liquid collection cup, the input end of the sand core filter head is connected with the filter cup, the filter tip on the sand core filter head is connected with a vacuum pump, the vacuum pump works, the fluorodichloroethane in the filter cup flows into the liquid collection cup through the first piece of filter paper and the sand core filter head, and the impurities and water are reserved on the upper surface of the first piece of filter paper.
In S2, before the first filter paper which is not hydrophilic is weighed for the first time, a dryer is used for drying the first filter paper, the temperature in the dryer is 65-75 ℃, the drying time is 4-6 minutes, the temperature for drying the first filter paper is preferably 70 ℃, and the drying time is preferably 5 minutes. Drying the filter paper is helpful for improving the accuracy of impurity detection in the pipeline. In addition, the pressure value of the vacuum pumping of the vacuum pump is-0.07 to 0.09MPa, and the pumping speed is 10 to 15L/min. In this embodiment, the pressure value of the vacuum pump is-0.08 MPa, and the pumping rate is 12L/min.
The timing of S2 was carried out, and the time required for S2 was 14 minutes as indicated by the timing results.
S3, weighing the qualitative filter paper, absorbing water left on the first filter paper and on the wall of the collecting container through the qualitative filter paper, weighing the qualitative filter paper after water absorption again, and subtracting the weight of the qualitative filter paper before water absorption from the weight of the qualitative filter paper after water absorption to obtain the water content in the pipeline; the first filter paper with the impurities remaining is weighed, and the weight of the first filter paper body is subtracted from the obtained weight, thereby obtaining the weight of the impurities.
And S3, drying the qualitative filter paper by using a dryer before weighing the qualitative filter paper for the first time, wherein the temperature in the dryer is 65-75 ℃, the drying time is 4-6 minutes, the temperature for drying the qualitative filter paper is preferably 70 ℃, and the drying time is preferably 5 minutes. Drying filter paper is helpful for improving the accuracy of water content detection in the pipeline.
The timing of S3 was carried out, and the time required for S3 was 9 minutes as indicated by the timing results.
And finally, comparing the detected water content with the weight of the impurities with a standard value, if the detected value is less than or equal to the standard value, the pipeline is a qualified product, and if the detected value is greater than the standard value, the pipeline is an unqualified product.
After the time of the above steps is overlapped, it can be seen that the time required for detecting one pipeline is less than 30 minutes, and compared with the karl fischer detection method in the prior art, the detection time is greatly shortened.
Example 2
The present embodiment differs from embodiment 1 in that:
s1, the pipe is flushed with 600ml of monofluorodichloroethane. The timing of S1 was timed, and the time required for S1 was 5.5 minutes as shown by the timing results.
S2, the temperature for drying the first filter paper is preferably 68 ℃, and the drying time is preferably 5.5 minutes. The pressure value of the vacuum pump for vacuum pumping is-0.075 MPa, and the pumping speed is 13L/min. The timing of S2 was carried out, and the time required for S2 was 14.5 minutes as shown by the timing results.
In S3, the temperature for drying the qualitative filter paper is preferably 72 ℃, and the drying time is 4.5 minutes. The timing of S3 was carried out, and the time required for S3 was 9 minutes as indicated by the timing results.
The time required to test a line is less than 30 minutes in this example.
Example 3
The present embodiment differs from embodiment 1 in that:
s1, the pipe is flushed with 550ml of monofluorodichloroethane. The timing of S1 was timed, and the time required for S1 was 5.2 minutes as shown by the timing results.
S2, the temperature for drying the first filter paper is preferably 65 ℃, and the drying time is preferably 6 minutes. The pressure value of the vacuum pump for vacuum pumping is-0.09 MPa, and the pumping speed is 10L/min. The timing of S2 was carried out, and the time required for S2 was 15 minutes as indicated by the timing results.
In S3, the temperature for drying the qualitative filter paper is preferably 75 deg.C, and the drying time is 4 minutes. The timing of S3 was timed, and the time required for S3 was 8.8 minutes as indicated by the timing results.
The time required to test a line is less than 30 minutes in this example.
Example 4
The present embodiment differs from embodiment 1 in that:
s1, the pipe is flushed with 450ml of monofluorodichloroethane. The timing of S1 was carried out, and the time required for S1 was 6 minutes as indicated by the timing results.
S2, the temperature for drying the first filter paper is preferably 75 ℃, and the drying time is preferably 4 minutes. The pressure value of the vacuum pump for vacuum pumping is-0.085 MPa, and the pumping speed is 11L/min. The timing of S2 was carried out, and the time required for S2 was 14.5 minutes as shown by the timing results.
In S3, the temperature for drying the qualitative filter paper is preferably 73 ℃, and the drying time is 4.2 minutes. The timing of S3 was timed, and the time required for S3 was 9.5 minutes as indicated by the timing results.
The time required to test one line in this example was 30 minutes.
Claims (2)
1. The method for rapidly detecting the cleanliness and the water content of the pipeline is characterized by comprising the following steps of:
s1, flushing the pipeline by adopting monofluorodichloroethane immiscible with water, so that the water and impurities remained in the pipeline move along with the monofluorodichloroethane, and collecting the monofluorodichloroethane after flushing by using a filter cup;
s2, after the first filter paper which is not hydrophilic is weighed, the first filter paper is assembled at the input end of the sand core filter head, the output end of the sand core filter head is connected with the liquid collection cup, the input end of the sand core filter head is connected with the filter cup, the filter tip on the sand core filter head is connected with a vacuum pump, the vacuum pump works, the fluorodichloroethane in the filter cup flows into the liquid collection cup through the first filter paper and the sand core filter head, and impurities and water are reserved on the upper surface of the first filter paper;
s3, weighing the qualitative filter paper, absorbing water left on the first filter paper and on the wall of the collecting container through the qualitative filter paper, weighing the qualitative filter paper after water absorption again, and subtracting the weight of the qualitative filter paper before water absorption from the weight of the qualitative filter paper after water absorption to obtain the water content in the pipeline; the first filter paper with the impurities remaining is weighed, and the weight of the first filter paper body is subtracted from the obtained weight, thereby obtaining the weight of the impurities.
2. The method for rapidly detecting the cleanliness and the water content of the pipeline according to claim 1, wherein a siphon method is adopted for flushing the pipeline in the step S1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010168319.0A CN111351729B (en) | 2020-03-12 | 2020-03-12 | Method for rapidly detecting cleanliness and water content of pipeline |
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| CN202010168319.0A CN111351729B (en) | 2020-03-12 | 2020-03-12 | Method for rapidly detecting cleanliness and water content of pipeline |
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| CN111351729A true CN111351729A (en) | 2020-06-30 |
| CN111351729B CN111351729B (en) | 2022-09-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112326493A (en) * | 2020-11-14 | 2021-02-05 | 安徽楚江科技新材料股份有限公司 | Detection apparatus for copper strips surface residual oil volume |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112326493A (en) * | 2020-11-14 | 2021-02-05 | 安徽楚江科技新材料股份有限公司 | Detection apparatus for copper strips surface residual oil volume |
| CN112326493B (en) * | 2020-11-14 | 2023-03-24 | 安徽楚江高精铜带有限公司 | Detection apparatus for copper strips surface residual oil volume |
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| CN111351729B (en) | 2022-09-06 |
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