CN110095237B - Leakage detection method of refrigerating system - Google Patents
Leakage detection method of refrigerating system Download PDFInfo
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- CN110095237B CN110095237B CN201910438067.6A CN201910438067A CN110095237B CN 110095237 B CN110095237 B CN 110095237B CN 201910438067 A CN201910438067 A CN 201910438067A CN 110095237 B CN110095237 B CN 110095237B
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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
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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Abstract
The invention relates to a detection method of a refrigerating system, in particular to a leakage detection method of the refrigerating system, which comprises the following steps: vacuumizing the refrigeration system; carrying out vacuum pressure maintaining on the refrigerating system after vacuumizing, filling detection nitrogen mixed gas if the pressure after the vacuum pressure maintaining is qualified, then detecting the pressure after the filling, and carrying out suction gun leakage detection if the pressure is not less than the detection pressure; performing air suction leak detection on a leak point which is easy to leak by using an air suction gun, and performing pressure maintaining test if the detection is qualified; if the pressure after pressure maintaining is smaller than the pressure maintaining pressure, the pressure is unqualified, and a suction gun leakage detection procedure is returned to detect a leakage point again; and after the pressure maintaining is qualified, discharging the gas in the nitrogen-hydrogen mixer of the refrigeration system, carrying out secondary vacuum pumping, and finally injecting nitrogen. The leakage detection method of the refrigerating system provided by the invention is simple and practical, low in detection cost, good in safety, high in leakage point detection precision, fast in leakage point detection, accurate and reliable in detection result, high in detection efficiency and suitable for leakage detection of various refrigerating systems.
Description
Technical Field
The invention relates to a detection method of a refrigerating system, in particular to a leakage detection method of the refrigerating system.
Background
With the development of social economy, the refrigeration industry is also developed vigorously. Refrigeration systems are widely used in various industries. Meanwhile, the national requirements for environmental protection are also higher and higher. The leak rates permitted in europe, the united states and china to the refrigeration industry are also becoming increasingly stringent. The improvement of the leak detection process is imperative.
A refrigerant system leak is a relatively common fault in the production and operation of a refrigeration apparatus, and once the fault occurs, the normal use of the apparatus is affected, and the damage to a compressor may be caused.
The leakage of the refrigeration system means that the air tightness of the system fails, so that a refrigerant in the system overflows, and external air and moisture enter the refrigeration system through a leakage point, so that the refrigeration system cannot work normally. The following are common sealing means and the causes of leaks in refrigeration systems:
welding, cracking, sand holes, loosening and breaking;
threaded connection, oxidation of a sealing surface and cracking of a bell mouth;
rubber sealing, sealing of various needle valves, rubber aging, breakage and deformation;
sealing a metal film, and damaging a membrane by using an electromagnetic valve;
packing sealing, various stop valves, loosening and abrasion;
the existing leak detection method comprises the following steps:
differential pressure method
Leakage below 1.0E-2mbarl/s cannot be detected;
missing points cannot be determined;
non-detection of flexible objects such as plastics, rubber, etc.;
stable temperature is required, and completely different test results can be obtained by temperature change;
the required time is very long, such as testing a large-cavity workpiece;
water testing method
Human factors have great influence;
leakage below 1.0E-3mbarl/s could not be detected
The workpiece is affected with damp, the product is possibly damaged or the workpiece needs to be dried, and the time is wasted;
soap lather process
Human factors have great influence;
leakage below 1.0E-3mbarl/s could not be detected
The workpiece is affected with damp and may damage the product or need to be dried;
the air flow carries away or blows the air bubbles;
sometimes even if there is a leak, no bubbles will form on the outer surface of some workpieces, such as the smooth surface.
Disclosure of Invention
In order to solve the problems, the invention provides a leakage detection method of a refrigerating system, which is suitable for the refrigerating system, is economical and feasible and has high detection efficiency, and the specific technical scheme is as follows:
a method of leak detection for a refrigeration system comprising the steps of:
s101, primary vacuumizing, and vacuumizing a refrigerating system;
s102, vacuum pressure maintaining, wherein the vacuum pressure maintaining is carried out after the refrigeration system is vacuumized, the pressure maintaining time is 1-5 minutes, if the pressure after the vacuum pressure maintaining is not less than the first vacuum pressure, the step S103 is carried out, and if the pressure after the vacuum pressure maintaining is less than the first vacuum pressure, the vacuum pressure alarm is carried out;
s103, filling detection gas, filling nitrogen-hydrogen mixed gas into the refrigerating system, and stopping filling gas when the detection pressure is reached;
s104, detecting the pressure after inflation, detecting the pressure after the refrigerating system is inflated with the nitrogen-hydrogen mixed gas, performing suction gun leakage detection if the pressure is not less than the detection pressure, and performing leakage alarm if the pressure is less than the detection pressure;
s105, leak detection is carried out by using a suction gun, leak points which are easy to leak are subjected to air suction leak detection by using the suction gun, and if the leak points are qualified, pressure maintaining test is carried out;
s106, performing pressure maintaining test, namely keeping the nitrogen-hydrogen mixed gas in a refrigerating system, keeping the time for 8-12 hours, if the pressure after pressure maintaining is not less than the pressure maintaining pressure, determining that the pressure is qualified, and if the pressure after pressure maintaining is less than the pressure maintaining pressure, determining that the pressure is not qualified, and returning to a suction gun leakage detecting process to detect a leakage point again;
s107, exhausting, namely exhausting the nitrogen-hydrogen mixed gas in the refrigerating system;
s108, secondary vacuumizing, and vacuumizing the refrigerating system after exhausting;
and S109, injecting nitrogen.
Preferably, the vacuum degree of the vacuum pumping in the step S101 is 3000Pa, and the first vacuum pressure in the step S102 is 2500-3000 Pa.
Preferably, the volume ratio of nitrogen to hydrogen in the nitrogen-hydrogen mixed gas is 94.8-95.2%, and the volume ratio of hydrogen is 4.8-5.2%.
Preferably, the detection pressure in the step S103 is 1.8-2.0 MPa.
Preferably, the suction gun performs detection according to the flowing direction of the refrigerant during leakage detection.
Preferably, the vacuum degree of the vacuum pumping in the step S108 is 2500-3000 Pa.
Preferably, the calculation formula of the holding pressure in step S106 is:
in the formula
t1 is the temperature at the time of inflation;
t2 is the temperature after pressure maintaining;
p1 inflation pressure;
p3 is the packing pressure.
Preferably, the range of P3 is P3 +/-0.05.
Preferably, before the step S101, the method further includes attaching a two-dimensional code to the workpiece and scanning the two-dimensional code; step S108 is followed by printing a qualified label and attaching the contract label to the qualified product.
Preferably, in step S107, the nitrogen-hydrogen mixed gas in the refrigeration system is discharged to the outside.
Compared with the prior art, the invention has the following beneficial effects:
the leakage detection method of the refrigerating system provided by the invention is simple and practical, low in detection cost, good in safety, high in leakage point detection precision, fast in leakage point detection, accurate and reliable in detection result, high in detection efficiency and suitable for leakage detection of various refrigerating systems.
Detailed Description
The present invention will now be further described.
A method of leak detection for a refrigeration system comprising the steps of:
s101, primary vacuumizing, and vacuumizing a refrigerating system;
s102, vacuum pressure maintaining, wherein the vacuum pressure maintaining is carried out after the refrigeration system is vacuumized, the pressure maintaining time is 1-5 minutes, if the pressure after the vacuum pressure maintaining is not less than the first vacuum pressure, the step S103 is carried out, and if the pressure after the vacuum pressure maintaining is less than the first vacuum pressure, the vacuum pressure alarm is carried out;
s103, filling detection gas, filling nitrogen-hydrogen mixed gas into the refrigerating system, and stopping filling gas when the detection pressure is reached;
s104, detecting the pressure after inflation, detecting the pressure after the refrigerating system is inflated with the nitrogen-hydrogen mixed gas, performing suction gun leakage detection if the pressure is not less than the detection pressure, and performing leakage alarm if the pressure is less than the detection pressure;
s105, leak detection is carried out by using a suction gun, leak points which are easy to leak are subjected to air suction leak detection by using the suction gun, and if the leak points are qualified, pressure maintaining test is carried out;
s106, performing pressure maintaining test, namely keeping the nitrogen-hydrogen mixed gas in a refrigerating system, keeping the time for 8-12 hours, if the pressure after pressure maintaining is not less than the pressure maintaining pressure, determining that the pressure is qualified, and if the pressure after pressure maintaining is less than the pressure maintaining pressure, determining that the pressure is not qualified, and returning to a suction gun leakage detecting process to detect a leakage point again;
s107, exhausting, namely exhausting the nitrogen-hydrogen mixed gas in the refrigerating system;
s108, secondary vacuumizing, and vacuumizing the refrigerating system after exhausting;
and S109, injecting nitrogen.
Specifically, before the step S101, attaching a two-dimensional code to the workpiece, and scanning the two-dimensional code; step S108 is followed by printing a qualified label and attaching the contract label to the qualified product.
In step S107, the nitrogen-hydrogen mixed gas in the refrigeration system is discharged to the outside to prevent the detection from being affected.
The vacuum degree of the vacuumizing in the step S101 is 3000Pa, and the first vacuum pressure in the step S102 is 2500-3000 Pa.
The volume ratio of nitrogen to hydrogen in the nitrogen-hydrogen mixed gas is 94.8-95.2%, and the volume ratio of hydrogen is 4.8-5.2%. When the hydrogen content is lower than 4.8%, the hydrogen nitrogen detector cannot detect the hydrogen nitrogen, and the lower the hydrogen concentration is, the lower the detection precision is; the high hydrogen concentration has explosion risk and poor safety.
The detection pressure in the step S103 is 1.8-2.0 MPa.
And detecting according to the flowing direction of the refrigerant when the suction gun detects the leakage. The detection is not easy to miss according to the flowing direction of the refrigerant.
And the vacuum degree of the vacuum pumping in the step S108 is 2500-3000 Pa.
The calculation formula of the holding pressure in step S106 is:
in the formula
t1 is the temperature at the time of inflation;
t2 is the temperature after pressure maintaining;
p1 inflation pressure;
p3 is the packing pressure.
The range of P3 is P3. + -. 0.05.
Common P3 values are shown in table one:
| t1 (temperature on inflation, DEG C) | 22 | 30 | 36 | 15 | 10 | 5 |
| t2 (temperature after 8 hours dwell,. degree.C.) | 18 | 20 | 30 | 10 | 5 | 10 |
| P1 (inflation pressure, Mpa) | 2 | 2 | 2 | 2 | 2 | 2 |
| T1＝273+t1 | 295 | 303 | 309 | 288 | 283 | 278 |
| T2＝273+t2 | 291 | 293 | 303 | 283 | 278 | 283 |
| P1*145+14.7 | 304.7 | 304.7 | 304.7 | 304.7 | 304.7 | 304.7 |
| P3 (pressure after pressure maintaining, Mpa) | 1.97 | 1.93 | 1.96 | 1.96 | 1.96 | 2.04 |
By the aid of the formula, influence of uncertain factors such as ambient temperature and inflation pressure on the detection result can be fully avoided, and therefore the detection result is accurate and reliable.
Claims (10)
1. A method of leak detection for a refrigeration system, comprising the steps of:
s101, primary vacuumizing, and vacuumizing a refrigerating system;
s102, vacuum pressure maintaining, wherein the vacuum pressure maintaining is carried out after the refrigeration system is vacuumized, the pressure maintaining time is 1-5 minutes, if the pressure after the vacuum pressure maintaining is not less than the first vacuum pressure, the step S103 is carried out, and if the pressure after the vacuum pressure maintaining is less than the first vacuum pressure, the vacuum pressure alarm is carried out;
s103, filling detection gas, filling nitrogen-hydrogen mixed gas into the refrigerating system, and stopping filling gas when the detection pressure is reached;
s104, detecting the pressure after inflation, detecting the pressure after the refrigerating system is inflated with the nitrogen-hydrogen mixed gas, performing suction gun leakage detection if the pressure is not less than the detection pressure, and performing leakage alarm if the pressure is less than the detection pressure;
s105, leak detection is carried out by using a suction gun, leak points which are easy to leak are subjected to air suction leak detection by using the suction gun, and if the leak points are qualified, pressure maintaining test is carried out;
s106, performing pressure maintaining test, namely keeping the nitrogen-hydrogen mixed gas in a refrigerating system, keeping the time for 8-12 hours, if the pressure after pressure maintaining is not less than the pressure maintaining pressure, determining that the pressure is qualified, and if the pressure after pressure maintaining is less than the pressure maintaining pressure, determining that the pressure is not qualified, and returning to a suction gun leakage detecting process to detect a leakage point again;
s107, exhausting, namely exhausting the nitrogen-hydrogen mixed gas in the refrigerating system;
s108, secondary vacuumizing, and vacuumizing the refrigerating system after exhausting;
and S109, injecting nitrogen.
2. The leak detection method for a refrigeration system according to claim 1, wherein a degree of vacuum applied in step S101 is 3000Pa, and a first vacuum pressure in step S102 is 2500 to 3000 Pa.
3. A leak detection method for a refrigeration system according to claim 1, wherein a volume ratio of nitrogen to hydrogen in the nitrogen-hydrogen mixed gas is 94.8 to 95.2%, and a volume ratio of hydrogen is 4.8 to 5.2%.
4. The leak detection method for a refrigeration system according to claim 1, wherein the detection pressure in step S103 is 1.8 to 2.0 Mpa.
5. A leak detection method for a refrigeration system according to claim 1, wherein the suction gun is tested for leak detection in accordance with a refrigerant flow direction.
6. The leak detection method for a refrigeration system according to claim 1, wherein the degree of vacuum of the vacuum pumping in step S108 is 2500 to 3000 Pa.
7. A leak detection method for a refrigeration system according to claim 1, wherein the holding pressure in step S106 is calculated by the formula:
in the formula
t1 is the temperature at the time of inflation;
t2 is the temperature after pressure maintaining;
p1 inflation pressure;
p3 is the packing pressure.
8. A leak detection method for a refrigeration system according to claim 7, wherein the range of P3 is P3 ± 0.05.
9. The leak detection method for the refrigeration system according to claim 1, wherein the step S101 further includes attaching a two-dimensional code to the workpiece and scanning the two-dimensional code; step S108 is followed by printing a qualified label and attaching the contract label to the qualified product.
10. A leak detection method for a refrigeration system according to claim 1, wherein the mixed gas of nitrogen and hydrogen in the refrigeration system is discharged to the outside in step S107.
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113623907A (en) * | 2021-07-14 | 2021-11-09 | 广州巴兰仕机械有限公司 | Air conditioner refrigerant recovery and charging system and control method thereof |
| CN113639936A (en) * | 2021-08-13 | 2021-11-12 | 深圳市新威尔电子有限公司 | Method for detecting air tightness leakage of square-shell battery cell formation equipment |
| CN114486104B (en) * | 2022-01-26 | 2022-11-01 | 中家院（北京）检测认证有限公司 | System and method for detecting sealing performance of refrigerating device and storage medium |
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