Helium Leak Detection System for Super Large Vacuum Chamber of Air
Conditioning Heat Exchanger
Introduction of Helium Leak Detection System for Super Large Vacuum
Chamber of Air Conditioning Heat Exchanger:
According to the basic principle of helium leak detection, helium
is used as a tracer gas to fill the workpiece in a vacuum chamber.
Then, a helium leak detector can quickly and accurately determine
the leakage situation of the workpiece with high accuracy.
The operator connects the workpiece interface to the quick
connector in the vacuum chamber. After the vacuum chamber door is
closed, the system can automatically complete large leak detection,
vacuum pumping, helium filling, micro leak detection, helium
recovery, fast production pace, and high leak detection accuracy.
Feature of Helium Leak Detection System for Super Large Vacuum
Chamber of Air Conditioning Heat Exchanger:
1. Background cleaning technology
The system has a unique background cleaning technology. After each
leak detection process is completed, pure nitrogen is automatically
filled into the leak detection fixture to remove the helium
background left in the previous leak detection cycle, without the
need for empty chamber operation to clear the background.
2. Calibration techniques
Automatic calibration of the leak detector: The helium leak
detector has a standard leak hole inside and an automatic
calibration function, which can calibrate the sensitivity and
accuracy of the leak detector at any time as needed.
Automatic calibration of the system: Our company has designed an
automatic calibration program, which can be completed by the
operator with one click through the human-machine interface, making
regular precision calibration operations very simple. After
calibration, the system can accurately determine the overall
leakage rate of the workpiece. The calibration interval can be set,
and the device has a calibration reminder function; Automatic
correction of calibration results;
Daily inspection of the system: The standard leak simulation for
daily inspection is used to simulate the workpiece to be inspected,
and online verification of the system accuracy can fully ensure the
stability of the system accuracy and the reliability of operation.
3. Specially designed sealing fixture
Two seals are used between the fixture and the workpiece, and the
sealing space formed between the two seals is connected to the
vacuum pump through an evacuation pipeline. When there is a gas
leak in the first seal, the leaked gas will reach the gap between
the two sealing rings and be pumped away by a vacuum pump through a
vacuum pipeline, effectively preventing helium from leaking from
the sealing ring and ensuring that the helium detected during the
leak detection process is helium escaping from the possible leak
point of the workpiece.
4. Convenience of system operation
The system adopts process automation technology, combining process
equipment with electrical automatic control technology. The entire
workpiece detection process is automatically controlled by PLC and
touch screen, without the need for operators to judge the results
of each process. The PLC program automatically judges the results
of the previous step and completes the execution of the next step
based on preset conditions. It not only saves physical labor, but
also replaces human judgment and execution, Free people from
complex mental labor.
5. System quality assurance for products
Due to the automatic completion of the entire product testing
process engineering by the system, there is no need for operator
judgment and execution, avoiding the impact of human factors on the
testing results, and ensuring the consistency, objectivity,
stability, and repeatability of the operation.
The system is equipped with standard leaks, and relevant
certificates are issued by the National Institute of Metrology of
China. The accuracy and stability of the system can be traced back
to the National Institute of Metrology of China, ensuring
third-party recognition of system leaks.
Automatic calibration of the leak detector: The helium leak
detector has a standard leak hole inside and an automatic
calibration function. When needed, the leak detector can be
calibrated for its own sensitivity and accuracy.
System calibration: A standard leak simulation for daily
calibration of workpieces to be inspected, which can be used for
online verification of system accuracy to fully ensure the
stability of system accuracy and operational reliability.
Parameter of Helium Leak Detection System for Super Large Vacuum Chamber of Air
Conditioning Heat Exchanger:
| Workpiece to be inspected | Air conditioning heat exchanger |
| Vacuum chamber size | 2m*2.5m*1.3m |
| Number of vacuum chambers | 1 |
| Vacuum chamber pipeline | 2 |
| Gas for gross leak detection | nitrogen |
| Pressure of gross leak detection | 0.1-4.5Mpa (This range is adjustable) |
| Tracer gas | helium |
| Alarm leakage rate | 1 g/year (5 * 10-7pa. m3/s) |
| Leakage helium pressure | 0.1-4.5 Mpa (adjustable range) |
| Cycle time | 20 minutes/ chamber (from closing to opening) |
| Workpiece loading and unloading method | Manual loading and unloading |
| Data Storage | With data storage function |
| Scan code | Equipped with scanning code gun |
