CZ35430U1 - Equipment for measuring the air permeability of rigid board materials by the pressure impulse method - Google Patents

Description

Equipment for measuring the air permeability of rigid board materials by the pressure pulse method

Field of technology

The technical solution can be used to measure the air permeability of board building materials.

State of the art

The measurement of the air permeability of the board materials is performed almost exclusively in laboratories, using the steady pressure difference method on the remote sides of the sample (pressure drop method). At the same time, it would be appropriate to measure the absolute values of the air permeability of individual materials directly on the construction site at various stages of construction, which would supplement the results of the total air permeability of the building envelope. At present, the air permeability of a selected section of the structure can be measured on the construction site by the above-mentioned pressure drop method, but it is tied to the completion of the building envelope.

The essence of the technical solution

The airtight measuring chamber is equipped with a sensitive micromanometer with a high recording frequency. The data cable, the power cable of the micromanometer and the penetration pass through the sheath of the measuring chamber. A silicone hose is connected to the offense. The silicone hose is connected to the pump via a valve and a throttling element. There is a battery and a switch on the electrical circuit of the micromanometer. The measuring chamber is pressed against the measured sample by means of a pressure collar and screws through the sealing of the connection joint. Air permeability testing is based on recording the change in pressure difference inside the measuring chamber, from which the air flow through the measured sample can be indirectly determined. After clamping the measuring chamber to the tested sample, a negative pressure is created in the measuring chamber, resp. overpressure. Subsequently, the valve on the silicone hose is closed to prevent air flow in this way. The decrease in pressure difference is recorded by a micromanometer with high resolution and sampling frequency. The advantage of the protected device is that the air permeability can be measured even when the building envelope is not completed and an optimized design of measures to reduce air permeability can be made.

The device also includes a screen glued to the surface of the chamber for the possibility of using the device for static pressure drop measurement. If this screen is not used, it is covered with airtight tape.

Clarification of drawings

Figure 1 schematically shows a section of a device for measuring the air permeability of rigid board materials.

Example of technical solution

The measuring chamber 1 is composed of fittings made of unsoftened PVC (adapter, socket plug) with a diameter of 315 mm. The joints are sealed with acrylic sealant. Inside the chamber is equipped with a micromanometer 3 Aerobtek Altis v4 + with a resolution of 1 Pa and a recording frequency of 10 Hz. The data cable 7, the power cable 16 of the micromanometer 3 and the metal penetration 2 pass through the sheath of the measuring chamber 1, to which a silicone tube 12 is connected. vacuum cleaners. There is an accumulator 5 on the electrical circuit of the micromanometer 3, the micromanometer 3 is activated by a rocker switch 6 glued to the housing of the measuring chamber 1. The measuring chamber 1 is pressed against the measured sample 4 behind

- 1 CZ 35430 UI by means of a wooden pressure collar 8 and screws 9 through the sealing of the connecting joint 10 with a molten asphalt strip th. 3 mm. A stainless steel screen 15 with a sheet thickness of 1 mm with circular sharp-edged holes is glued to the casing of the measuring chamber 1 for possible use of the measuring device by the pressure drop method.

Industrial applicability

This technical solution can be used especially for in situ measurements on the construction site in various stages of construction, such as the acceptance of the delivered material, after the construction of the rough construction or after the completion of the building envelope for closer diagnostics of the distribution of building envelope leaks. This example of a technical solution is optimized for measuring OSB boards, which are very often used in modern wooden constructions of a column system in the position of an airtight layer.

Claims (2)

PROTECTION REQUIREMENTS Device for measuring the air permeability of solid plate materials by the method of pressure pulse, characterized in that it consists of an airtight measuring chamber (1) which is equipped with a sensitive micromanometer (3) with a high recording frequency, a data cable passing through the measuring chamber sheath (1) (7), the power cable (16) of the micromanometer (3) and the bushing (2), to which a silicone tube (12) is connected, which connects the measuring chamber (1) to the pump (14) via a valve (11) and a throttling element ( 13), from the electrical circuit of the micromanometer (3), on which the accumulator (5) and the switch (6) are located, and from the sealing of the connection joint (10) between the measuring chamber (1) and the measured sample (4), which is pressed by the pressure collar (8) and screws (9). Device according to Claim 1, characterized in that a screen (15) with circular openings is provided in the housing of the measuring chamber (1).