CN110836753A - Helium mass spectrum positive pressure detection method for plate-fin heat exchanger with closed chambers on two sides - Google Patents
Helium mass spectrum positive pressure detection method for plate-fin heat exchanger with closed chambers on two sides Download PDFInfo
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- CN110836753A CN110836753A CN201911140219.0A CN201911140219A CN110836753A CN 110836753 A CN110836753 A CN 110836753A CN 201911140219 A CN201911140219 A CN 201911140219A CN 110836753 A CN110836753 A CN 110836753A
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- helium
- heat exchanger
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- fin heat
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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
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/202—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material using mass spectrometer detection systems
- G01M3/205—Accessories or associated equipment; Pump constructions
Abstract
The invention belongs to the technical field of cooling systems used for vehicles or equipment, and particularly relates to a helium mass spectrum positive pressure detection method for a plate-fin heat exchanger with closed chambers on two sides. The method comprises the steps of injecting positive pressure helium gas into a closed cavity on one side, inserting a suction head of a helium mass spectrometer leak detector into the closed cavity on the other side through a pipe opening, detecting whether helium gas escapes to enable the helium mass spectrometer leak detector to give an alarm, and judging whether micro-leakage communicated with the inside exists in the heat exchanger. Compared with the prior art, the detection method disclosed by the invention has the advantages that helium with certain pressure is injected into the closed cavity on one side through the usability, and in the closed cavity on the other side, the helium is detected whether to escape through the suction head of the helium mass spectrometer leak detector without vacuumizing, so that whether the plate-fin heat exchanger leaks or not is judged. The whole detection process of the detection method can be completed in only a few minutes, and the method is very quick and effective.
Description
Technical Field
The invention belongs to the technical field of cooling systems used for vehicles or equipment, and particularly relates to a helium mass spectrum positive pressure detection method for a plate-fin heat exchanger with closed chambers on two sides.
Background
The hot medium and the cold medium exchange heat in the heat exchanger, but the two media cannot be mixed with each other. The heat exchanger with the single-side closed can determine whether leakage exists and the leakage position through an airtight test, and the heat exchanger with the closed chamber cannot visually detect whether leakage exists or not because both sides of the heat exchanger are closed spaces, and particularly, the leakage is very difficult to find when the leakage is very tiny.
Disclosure of Invention
Technical problem to be solved
The technical problem to be solved by the invention is as follows: how to provide a plate-fin heat exchanger helium mass spectrum positive pressure detection method for a closed chamber on two sides.
(II) technical scheme
In order to solve the technical problem, the invention provides a positive pressure detection method for helium mass spectrum of a plate-fin heat exchanger with closed chambers on two sides.
The detection method needs equipment comprising the following steps: a helium mass spectrometer leak detector, helium gas and a connecting pipeline;
the detection method specifically comprises the following steps:
step 1: injecting helium or nitrogen containing helium with the design requirement on the pressure into one side of the plate-fin heat exchanger, sealing the pipe orifice, maintaining the pressure for a certain time, and keeping the injection pressure value stable;
step 2: starting a helium mass spectrometer leak detector to enable the detector to be in a normal detection working state;
and step 3: probing the pipe orifice of the closed chamber without helium gas at the other side by using a sniffing probe, placing the pipe orifice at different positions, stabilizing for a certain time, and checking the leakage rate display on the instrument;
and 4, step 4: and when the difference between the display value and the numerical value not stretching into the pipe orifice does not exceed a preset threshold value, judging that the heat exchanger does not have micro-leakage, and when the display value is obviously increased and exceeds the preset threshold value and the helium mass spectrometer leak detector gives an alarm, indicating that the micro-leakage exists in the detected heat exchanger and needing to be reworked.
Wherein, in the step 1, the content of helium in the nitrogen is not less than 25%.
In the step 1, the pressure is maintained for a certain time, namely for more than 2 min.
Wherein, in the step 3, the stabilization for a certain time refers to stabilization for 30 s.
In step 3, the positions are stabilized for a certain time, and the positions are stabilized for a certain time at different positions respectively.
And setting an alarm value of the helium mass spectrometer leak detector according to the requirement of detection precision, namely the value of the preset threshold.
Wherein, both sides of the plate-fin heat exchanger are closed chambers.
Wherein, the side of the plate-fin heat exchanger, which is not filled with helium, is sealed in the chamber without vacuumizing.
The helium mass spectrometer leak detector is sensitive to the content of helium gas, and the helium mass spectrometer leak detector can give an alarm by using trace helium gas, so that the helium mass spectrometer leak detector can judge whether micro leakage exists effectively.
(III) advantageous effects
Compared with the prior art, the detection method disclosed by the invention has the advantages that helium with certain pressure is injected into the closed cavity on one side through the usability, and in the closed cavity on the other side, the helium is detected whether to escape through the suction head of the helium mass spectrometer leak detector without vacuumizing, so that whether the plate-fin heat exchanger leaks or not is judged.
The whole detection process of the detection method can be completed in only a few minutes, and the method is very quick and effective.
Drawings
Fig. 1 is a schematic diagram of the present invention.
In the figure, 1: the two sides of the closed chamber plate-fin heat exchanger; 2: a helium tank; 3: a helium mass spectrometer leak detector; 4: a sniffing probe; 5: and a pressing device.
Detailed Description
In order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
In order to solve the technical problem, the invention provides a positive pressure detection method for helium mass spectrum of a plate-fin heat exchanger with closed chambers on two sides.
The detection method needs equipment comprising the following steps: a helium mass spectrometer leak detector, helium gas and a connecting pipeline;
the detection method specifically comprises the following steps:
step 1: injecting helium or nitrogen containing helium with the design requirement on the pressure into one side of the plate-fin heat exchanger, sealing the pipe orifice, maintaining the pressure for a certain time, and keeping the injection pressure value stable;
step 2: starting a helium mass spectrometer leak detector to enable the detector to be in a normal detection working state;
and step 3: probing the pipe orifice of the closed chamber without helium gas at the other side by using a sniffing probe, placing the pipe orifice at different positions as much as possible, stabilizing for a certain time, and checking the leakage rate display on the instrument;
and 4, step 4: and when the difference between the display value and the numerical value not stretching into the pipe orifice does not exceed a preset threshold value, judging that the heat exchanger does not have micro-leakage, and when the display value is obviously increased and exceeds the preset threshold value and the helium mass spectrometer leak detector gives an alarm, indicating that the micro-leakage exists in the detected heat exchanger and needing to be reworked.
Wherein, in the step 1, the content of helium in the nitrogen is not less than 25%.
In the step 1, the pressure is maintained for a certain time, namely for more than 2 min.
Wherein, in the step 3, the stabilization for a certain time refers to stabilization for 30 s.
In step 3, the positions are stabilized for a certain time, and the positions are stabilized for a certain time at different positions respectively.
And setting an alarm value of the helium mass spectrometer leak detector according to the requirement of detection precision, namely the value of the preset threshold.
Wherein, both sides of the plate-fin heat exchanger are closed chambers.
Wherein, the side of the plate-fin heat exchanger, which is not filled with helium, is sealed in the chamber without vacuumizing.
The helium mass spectrometer leak detector is sensitive to the content of helium gas, and the helium mass spectrometer leak detector can give an alarm by using trace helium gas, so that the helium mass spectrometer leak detector can judge whether micro leakage exists effectively.
Example 1
The detection method of the present embodiment is as follows.
As shown in fig. 1, during detection, one of two pipe orifices of a plate-fin heat exchanger 1 with two closed chambers on two sides is closed, the other pipe orifice is connected with a helium tank 2 through a pressurizing device 5, helium with a certain pressure is injected according to the test pressure of the heat exchanger, after the required pressure value is reached, the pressurizing device is closed and the pressure is maintained for more than 2min, and the pressure value is stabilized at the required test pressure value. The helium mass spectrometer leak detector 3 is started, the sniffing probe 4 is inserted into the open pipe orifices of the plate-fin heat exchangers 1 with the closed chambers at the two sides, each pipe orifice needs to be inserted, the probe is stable for more than 30s after being placed, the leakage rate value displayed on the helium mass spectrometer leak detector 3 is checked, if the value is not obviously changed or the magnitude of the value is not changed before being placed, the condition that no micro-leakage exists in the plate-fin heat exchangers 1 with the closed chambers at the two sides is judged, and if the helium mass spectrometer leak detector 3 sends out an alarm sound, the condition that the micro-leakage exists in the plate-fin heat exchangers 1 with the closed chambers at the two sides is.
The helium tank 2 is not limited to a helium tank, but may be a mixed gas of nitrogen and helium, but the content of helium is required to be not less than 25%.
Wherein, the alarm value of the helium mass spectrometer leak detector 3 can be set according to the requirement of detection precision.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The positive pressure detection method for the helium mass spectrum of the plate-fin heat exchanger with the two closed chambers on two sides is characterized in that positive pressure helium is injected into the closed chamber on one side, a suction head of the helium mass spectrum leak detector is used in the closed chamber on the other side, the suction head is inserted into the closed chamber from a pipe opening, whether helium-containing gas escapes or not is detected, the helium mass spectrum leak detector gives an alarm, and whether micro-leakage communicated with the inside exists in the heat exchanger or not is judged.
2. The helium mass spectrometry positive pressure detection method for the plate-fin heat exchanger with two closed chambers on two sides as claimed in claim 1, wherein the detection method requires equipment comprising: a helium mass spectrometer leak detector, helium gas and a connecting pipeline;
the detection method specifically comprises the following steps:
step 1: injecting helium or nitrogen containing helium with the design requirement on the pressure into one side of the plate-fin heat exchanger, sealing the pipe orifice, maintaining the pressure for a certain time, and keeping the injection pressure value stable;
step 2: starting a helium mass spectrometer leak detector to enable the detector to be in a normal detection working state;
and step 3: probing the pipe orifice of the closed chamber without helium gas at the other side by using a sniffing probe, placing the pipe orifice at different positions, stabilizing for a certain time, and checking the leakage rate display on the instrument;
and 4, step 4: and when the difference between the display value and the numerical value not stretching into the pipe orifice does not exceed a preset threshold value, judging that the heat exchanger does not have micro-leakage, and when the display value is obviously increased and exceeds the preset threshold value and the helium mass spectrometer leak detector gives an alarm, indicating that the micro-leakage exists in the detected heat exchanger and needing to be reworked.
3. The method for detecting helium mass spectrum positive pressure of a plate-fin heat exchanger with two closed chambers as claimed in claim 2, wherein in the step 1, the content of helium in the nitrogen gas is not less than 25%.
4. The helium mass spectrometry positive pressure detection method for the plate-fin heat exchanger with the closed chamber on both sides as claimed in claim 2, wherein in the step 1, the pressure maintaining is performed for a certain time, which is more than 2 min.
5. The helium mass spectrometry positive pressure detection method for the plate-fin heat exchanger with two closed chambers as claimed in claim 2, wherein in the step 3, the stabilization for a certain time is 30 s.
6. The helium mass spectrometry positive pressure detection method for the plate-fin heat exchanger with the closed chamber on two sides as claimed in claim 2, wherein in the step 3, the temperature is stabilized for a certain time, and the temperature is stabilized for a certain time at different positions respectively.
7. The helium mass spectrometry positive pressure detection method for the plate-fin heat exchanger with the closed chambers on two sides as claimed in claim 2, wherein the alarm value of the helium mass spectrometer leak detector, namely the value of the preset threshold value, is set according to the requirement of detection accuracy.
8. The method of claim 1, wherein the closed chamber is located on both sides of the plate-fin heat exchanger.
9. The method for detecting helium mass spectrum positive pressure of a plate-fin heat exchanger with two closed chambers as claimed in claim 8, wherein no vacuum is required to be drawn in the closed chamber on the side of the plate-fin heat exchanger where no helium gas is injected.
10. The helium mass spectrum positive pressure detection method for the plate-fin heat exchanger with the closed chambers on two sides as claimed in claim 1, wherein the helium mass spectrum leak detector is sensitive to the content of helium, and the trace helium can make the helium mass spectrum leak detector alarm, so that whether micro-leakage exists or not can be judged effectively through the helium mass spectrum leak detector.
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| CN201911140219.0A CN110836753A (en) | 2019-11-20 | 2019-11-20 | Helium mass spectrum positive pressure detection method for plate-fin heat exchanger with closed chambers on two sides |
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| CN201911140219.0A CN110836753A (en) | 2019-11-20 | 2019-11-20 | Helium mass spectrum positive pressure detection method for plate-fin heat exchanger with closed chambers on two sides |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112935507A (en) * | 2021-01-29 | 2021-06-11 | 中国石油大学(华东) | Diffusion welding process for core body of printed circuit board type heat exchanger |
| CN113029467A (en) * | 2021-03-09 | 2021-06-25 | 山东大学 | System for judging insufficient welding degree of plate-fin heat exchanger and working method |
| CN114034448A (en) * | 2021-10-26 | 2022-02-11 | 成都飞机工业（集团）有限责任公司 | Pipeline leakage point position detection system and detection method |
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2019
- 2019-11-20 CN CN201911140219.0A patent/CN110836753A/en active Pending
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112935507A (en) * | 2021-01-29 | 2021-06-11 | 中国石油大学(华东) | Diffusion welding process for core body of printed circuit board type heat exchanger |
| CN112935507B (en) * | 2021-01-29 | 2022-06-21 | 中国石油大学(华东) | Diffusion welding process for core body of printed circuit board type heat exchanger |
| CN113029467A (en) * | 2021-03-09 | 2021-06-25 | 山东大学 | System for judging insufficient welding degree of plate-fin heat exchanger and working method |
| CN113029467B (en) * | 2021-03-09 | 2022-09-13 | 山东大学 | System for judging insufficient welding degree of plate-fin heat exchanger and working method |
| CN114034448A (en) * | 2021-10-26 | 2022-02-11 | 成都飞机工业（集团）有限责任公司 | Pipeline leakage point position detection system and detection method |
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Application publication date: 20200225 |
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