CN114354087A - Four-process condenser ultrasonic internal leakage detection method - Google Patents
Four-process condenser ultrasonic internal leakage detection method Download PDFInfo
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- CN114354087A CN114354087A CN202111556991.8A CN202111556991A CN114354087A CN 114354087 A CN114354087 A CN 114354087A CN 202111556991 A CN202111556991 A CN 202111556991A CN 114354087 A CN114354087 A CN 114354087A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations
- G01M3/243—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations for pipes
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Abstract
The invention discloses a four-process condenser ultrasonic internal leakage detection method; the four-flow condenser comprises a plurality of cooling pipes which are arranged in parallel and two header pipes which are arranged at two ends of the plurality of cooling pipes; two spacers are arranged in the two main pipes to separate the cooling pipes into four sequentially communicated flows; the inner leakage detection method of the four-process condenser comprises the following steps: the method comprises the following steps of (1) pumping ultrasonic waves into an inlet of a four-process condenser by using an ultrasonic generator, arranging a receiver at an outlet of the four-process condenser, and monitoring and calculating the actual propagation time T of the ultrasonic waves from the inlet to the outlet of the four-process condenser by using an electric control system; and comparing the actual propagation time T with a judgment value T0 to determine whether the four-process condenser has internal leakage or not. The invention can efficiently and quickly detect whether the inner leakage exists in the spacers arranged in the header pipes at the two ends of the cooling pipe of the vehicle air conditioner condenser.
Description
Technical Field
The invention relates to the technical field of detection of vehicle air conditioner condensers, in particular to a four-process condenser ultrasonic internal leakage detection method.
Background
For the condenser product, in order to better condense the refrigerant entering the condenser, the refrigerant needs to flow through a sufficient path to exchange heat according to the heat exchange requirement.
However, the existing air-conditioning condenser for the vehicle can be suitable for a narrow vehicle body due to the requirement, so that the spacers are arranged in the header pipes at two ends of the cooling pipes to separate the flow channel into multiple flows, if an internal leakage point exists at the position where the spacers are arranged in the header pipes, the spacers cannot complete the separation effect, the internal leakage of the refrigerant can be caused, and the internal leakage cannot be detected through common methods such as visual inspection, helium detection and water detection.
Therefore, how to efficiently and quickly detect whether the inner leakage exists in the spacers arranged in the header pipes at the two ends of the cooling pipe of the vehicle air conditioner condenser becomes a technical problem which needs to be solved by technical personnel in the field.
Disclosure of Invention
In view of the defects in the prior art, the invention provides a four-process condenser ultrasonic internal leakage detection method, which can efficiently and quickly detect whether internal leakage exists in spacers arranged in header pipes at two ends of a cooling pipe of a condenser of an air conditioner for a vehicle.
In order to achieve the purpose, the invention discloses a four-process condenser ultrasonic internal leakage detection method; the four-flow condenser comprises a plurality of cooling pipes which are arranged in parallel and two header pipes which are arranged at two ends of the plurality of cooling pipes; two spacers are arranged in the two main pipes to separate the cooling pipes into four sequentially communicated flows;
the inner leakage detection method of the four-process condenser comprises the following steps:
utilizing an ultrasonic generator to inject ultrasonic waves from an inlet of the four-process condenser, arranging a receiver at an outlet of the four-process condenser, and monitoring and calculating the actual propagation time T of the ultrasonic waves from the inlet to the outlet of the four-process condenser by using an electric control system;
and comparing the actual propagation time T with a judgment value T0 to determine whether the four-process condenser has internal leakage.
Preferably, the determination value T0 is obtained as follows:
taking more than 50 four-process condensers which have no internal leakage and have the same type as the four-process condensers to be detected as samples;
performing ultrasonic detection on each sample at least twice, namely, inputting ultrasonic waves from an inlet of each sample, arranging a receiver at an outlet of each sample, and monitoring and calculating all sample propagation time Tn of the ultrasonic waves from the inlet to the outlet of each sample by using an electronic control system, wherein n is 1, 2, 3 and … … infinity;
and (4) carrying out statistical analysis on the propagation time Tn of all the samples by using positive distribution to obtain a mean value and upper and lower limits, namely the judgment value T0.
Preferably, before the internal leakage detection of the four-flow condenser is started, or at an interval of more than 24 hours after the last system calibration, the system calibration is required; the system calibration comprises the following steps:
setting a calibration pipeline with known ultrasonic wave passing time between the ultrasonic generator and the receiver, and collecting the calibration time of the ultrasonic wave passing through the calibration pipeline for more than 3 times through the ultrasonic generator and the receiver;
calibrating by the system if all of the calibration times are within ± 5% of the known ultrasonic transit time; otherwise, the ultrasonic generator and the receiver need to be checked, and the inner leakage detection of the four-process condenser is carried out after the distortion problem of the ultrasonic generator and the receiver is solved.
The invention has the beneficial effects that:
the invention can efficiently and quickly detect whether the inner leakage exists in the spacers arranged in the header pipes at the two ends of the cooling pipe of the vehicle air conditioner condenser.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
Fig. 1 is a schematic diagram showing a state where ultrasonic waves pass through a four-pass condenser according to an embodiment of the present invention.
Detailed Description
Examples
As shown in fig. 1, a four-process condenser ultrasonic internal leakage detection method; the four-flow condenser comprises a plurality of cooling pipes which are arranged in parallel and two header pipes which are arranged at two ends of the plurality of cooling pipes; two spacers are arranged in the two main pipes to separate the cooling pipes into four sequentially communicated flows;
the inner leakage detection method of the four-process condenser comprises the following steps:
the method comprises the following steps of (1) pumping ultrasonic waves into an inlet of a four-process condenser by using an ultrasonic generator, arranging a receiver at an outlet of the four-process condenser, and monitoring and calculating the actual propagation time T of the ultrasonic waves from the inlet to the outlet of the four-process condenser by using an electric control system;
and comparing the actual propagation time T with a judgment value T0 to determine whether the four-process condenser has internal leakage or not.
The principle of the invention is as follows:
under normal circumstances, the actual propagation time T is necessarily within the range of the determination value T0; in the event of internal leakage, the actual propagation time T is always smaller than the determination value T0. Therefore, a product is detected, and if the propagation time is less than T1, the product is indicated to have internal leakage.
In some embodiments, the decision value T0 is obtained as follows:
taking more than 50 four-process condensers which have no internal leakage and have the same type as the four-process condensers to be detected as samples;
performing ultrasonic detection on each sample at least twice, namely, inputting ultrasonic waves from an inlet of each sample, arranging a receiver at an outlet of each sample, and monitoring and calculating all sample propagation time Tn of the ultrasonic waves from the inlet to the outlet of each sample by using an electronic control system, wherein n is 1, 2, 3 and … … infinity;
and (4) carrying out statistical analysis on the propagation time Tn of all samples by using positive distribution to obtain a mean value and an upper limit and a lower limit, namely a judgment value T0.
In some embodiments, system calibration is required before the internal leakage detection of the four-pass condenser is started, or at an interval of more than 24 hours from the last system calibration; the system calibration comprises the following steps:
setting a calibration pipeline with known ultrasonic wave passing time between an ultrasonic generator and a receiver, and collecting the calibration time of the ultrasonic wave passing through the calibration pipeline for more than 3 times by the ultrasonic generator and the receiver;
if all the calibration time is within +/-5% deviation range of the known ultrasonic wave passing time, the system is calibrated; otherwise, the ultrasonic generator and the receiver need to be checked, and the internal leakage detection of the four-process condenser is carried out after the distortion problem of the ultrasonic generator and the receiver is solved.
The execution of the steps can prevent the detection precision from being adversely affected by the self-failure of equipment components such as an ultrasonic generator or a receiver or the like or the change of external environment (such as air pressure, temperature and the like).
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (3)
1. A four-process condenser ultrasonic internal leakage detection method; the four-flow condenser is characterized by comprising a plurality of cooling pipes (1) which are arranged in parallel and two header pipes (2) which are arranged at two ends of the plurality of cooling pipes (1); two spacers (3) are arranged in the two header pipes (2) respectively to separate the plurality of cooling pipes (1) into four sequentially communicated flows;
the inner leakage detection method of the four-process condenser comprises the following steps:
utilizing an ultrasonic generator to inject ultrasonic waves from an inlet of the four-process condenser, arranging a receiver at an outlet of the four-process condenser, and monitoring and calculating the actual propagation time T of the ultrasonic waves from the inlet to the outlet of the four-process condenser by using an electric control system;
and comparing the actual propagation time T with a judgment value T0 to determine whether the four-process condenser has internal leakage.
2. The four-flow condenser ultrasonic internal leakage detection method according to claim 1, wherein the determination value T0 is obtained as follows:
taking more than 50 four-process condensers which have no internal leakage and have the same type as the four-process condensers to be detected as samples;
performing ultrasonic detection on each sample at least twice, namely, inputting ultrasonic waves from an inlet of each sample, arranging a receiver at an outlet of each sample, and monitoring and calculating all sample propagation time Tn of the ultrasonic waves from the inlet to the outlet of each sample by using an electronic control system, wherein n is 1, 2, 3 and … … infinity;
and (4) carrying out statistical analysis on the propagation time Tn of all the samples by using positive distribution to obtain a mean value and upper and lower limits, namely the judgment value T0.
3. The four-process condenser ultrasonic internal leakage detection method according to claim 1, wherein the system calibration is required before the internal leakage detection of the four-process condenser is started or at an interval of more than 24 hours from the previous system calibration; the system calibration comprises the following steps:
setting a calibration pipeline with known ultrasonic wave passing time between the ultrasonic generator and the receiver, and collecting the calibration time of the ultrasonic wave passing through the calibration pipeline for more than 3 times through the ultrasonic generator and the receiver;
calibrating by the system if all of the calibration times are within ± 5% of the known ultrasonic transit time; otherwise, the ultrasonic generator and the receiver need to be checked, and the inner leakage detection of the four-process condenser is carried out after the distortion problem of the ultrasonic generator and the receiver is solved.
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| CN202111556991.8A CN114354087A (en) | 2021-12-18 | 2021-12-18 | Four-process condenser ultrasonic internal leakage detection method |
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Citations (9)
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| JP2000249435A (en) * | 1999-03-01 | 2000-09-14 | Daikin Ind Ltd | Refrigeration apparatus and refrigerant leak detection method for refrigeration apparatus |
| US6212942B1 (en) * | 1997-10-21 | 2001-04-10 | Denso Corporation | Leakage inspection method and apparatus |
| US20100300129A1 (en) * | 2009-05-28 | 2010-12-02 | American Power Conversion Corporation | Systems and methods for detecting refrigerant leaks in cooling systems |
| CN203981362U (en) * | 2014-05-27 | 2014-12-03 | 丁卫红 | In heat exchanger, leak detector and system |
| CN104266414A (en) * | 2014-09-16 | 2015-01-07 | 重庆长安汽车股份有限公司 | Automotive air conditioning condenser adaptive to peripheral flow field |
| CN206920090U (en) * | 2017-06-01 | 2018-01-23 | 中广核中电能源服务（深圳）有限公司 | A kind of compressed air ultrasonic wave leak detector calibrating installation |
| CN107923683A (en) * | 2015-11-11 | 2018-04-17 | 株式会社难波 | Refrigerant leakage detecting device in kind of refrigeration cycle |
| US20210071887A1 (en) * | 2019-09-05 | 2021-03-11 | Trane International Inc. | Systems and Methods for Refrigerant Leak Detection in a Climate Control System |
| CN214173675U (en) * | 2021-02-26 | 2021-09-10 | 沈阳马勒汽车热系统有限公司 | Two-process condenser inner leakage detection device |
-
2021
- 2021-12-18 CN CN202111556991.8A patent/CN114354087A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6212942B1 (en) * | 1997-10-21 | 2001-04-10 | Denso Corporation | Leakage inspection method and apparatus |
| JP2000249435A (en) * | 1999-03-01 | 2000-09-14 | Daikin Ind Ltd | Refrigeration apparatus and refrigerant leak detection method for refrigeration apparatus |
| US20100300129A1 (en) * | 2009-05-28 | 2010-12-02 | American Power Conversion Corporation | Systems and methods for detecting refrigerant leaks in cooling systems |
| CN203981362U (en) * | 2014-05-27 | 2014-12-03 | 丁卫红 | In heat exchanger, leak detector and system |
| CN104266414A (en) * | 2014-09-16 | 2015-01-07 | 重庆长安汽车股份有限公司 | Automotive air conditioning condenser adaptive to peripheral flow field |
| CN107923683A (en) * | 2015-11-11 | 2018-04-17 | 株式会社难波 | Refrigerant leakage detecting device in kind of refrigeration cycle |
| CN206920090U (en) * | 2017-06-01 | 2018-01-23 | 中广核中电能源服务（深圳）有限公司 | A kind of compressed air ultrasonic wave leak detector calibrating installation |
| US20210071887A1 (en) * | 2019-09-05 | 2021-03-11 | Trane International Inc. | Systems and Methods for Refrigerant Leak Detection in a Climate Control System |
| CN214173675U (en) * | 2021-02-26 | 2021-09-10 | 沈阳马勒汽车热系统有限公司 | Two-process condenser inner leakage detection device |
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