Device for measuring internal pressure of vacuum insulating panel and testing method thereof

Abstract

The invention discloses a device for measuring the internal pressure of a vacuum insulating panel and a testing method of the device for measuring the internal pressure of the vacuum insulating panel. The device for measuring the internal pressure of the vacuum insulating panel is used on the basis of the principle that when a pressure difference exists between the interior and the exterior of a barrier membrane of the vacuum insulating panel, the barrier membrane can bulge towards the side with lower pressure, and the barrier membrane achieves balance when internal pressure and external pressure are equal. The device for measuring the internal pressure of the vacuum insulating panel is characterized by comprising a computer, a radio receiving device, a unipump, a high-precision vacuum pressure sensor, a level calibration frame, a miniature laser range finder, a hard small-opening transparent sucker, a hard guide pipe, a clip and an L-shaped spring baffle. The device for measuring the internal pressure of the vacuum insulating panel can accurately measure the internal pressure of the vacuum insulating panel, meet the requirement for measurement of the vacuum insulating panel with the high vacuum degree, achieve visualization of the measuring process, cannot damage a sample, and can be applicable to measurement of the vacuum insulating panels with different sizes. Due to the fact that the measurement process is accurate, simple and rapid, the device for measuring the internal pressure of the vacuum insulating panel can be widely applied to actual production.

Description

technical field [0001] The invention relates to a pressure measuring device and a testing method thereof, in particular to a measuring device and a testing method thereof for the internal pressure of a vacuum insulation panel. Background technique [0002] Vacuum insulation panels are a new type of ultra-high-efficiency insulation panels that have emerged in recent years. They are mainly composed of core materials, barrier films and getters. Because it combines the advantages of vacuum insulation and particle insulation, it maximizes the vacuum inside the panel and reduces gas convection to achieve efficient insulation. Therefore, it has extremely low thermal conductivity and excellent thermal insulation performance. It is currently the world's The most advanced high-efficiency thermal insulation materials in the world. At present, there is no national standard for the detection method of the internal pressure of the vacuum insulation panel, and the industry standard can on...

AI Technical Summary

Problems solved by technology

However, this technology has limitations in the following aspects: when the barrier film of the vacuum insulation panel has a certain thickness of aluminum foil (in order to ensure the low air permeability of the insulation panel, aluminum foil is essential), the aluminum foil will shield the sensing signal, Therefore, this method cannot be implemented; this test method is not suitable for large-scale testing, random sampling, and the sample is destroyed when the sensor is taken out

This method also has defects and problems: the destructive test cannot complete large-scale detection; in addition, the P in the formula 0 =[P 2 (V+V 1 ) T 1 / T 2 -P 1 V 1 In ] / V, V as a known quantity represents the volume of the vacuum chamber in the vacuum insulation panel, but the volume inside the vacuum chamber is extremely difficult to measure and is prone to errors, so it is debatable as a known quantity; this device cannot measure the volume of the vacuum insulation panel. It is also a problem whether the vacuum insulation panel with too large area can be placed in the vacuum box

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