SU93510A1 - Pneumatic device for measuring gaps in joints - Google Patents

Description

The invention relates to pneumatic devices serving to measure the gaps in the joints of machine parts, for example, engines, by blowing air through the measured gap.

Known devices of the same purpose usually include a tank equipped with a pump, a pressure gauge and a pipeline for supplying air to the measured clearance, as well as a device for recording the size of the gap.

Such devices are connected to a pneumatic network, they require a continuous supply of air to the gap and the measurement of the latter proceeds at a constant air pressure in the system, and the value of the indicator of the recording fixture is given immediately after the air supply to the gap. This leads to the complexity of the design of such devices, the imperfection of their operation, and sometimes the impossibility of their use, for example, when determining the size of the gaps in the joints of parts of the unassembled engines.

The proposed device operates on a simpler principle — the determination of the magnitude of the measured gap is carried out during the period of air pressure drop in the instrument system by the difference of the quantitative air flow through the measured gap and the calibration hole of the recording device. Hence, a distinctive feature of the proposed device is that the recording device is designed as a chamber equipped with a pressure gauge and connected to a pipeline for supplying air to the measured clearance by means of a rubber bore at one end, which is blocked by a spring loaded rod the diaphragm of the reducer when the air pressure in the tank decreases to the limit due to the membrane spring. A check valve is installed at the bottom of the chamber to prevent air from escaping from the chamber when the pressure in it exceeds the pressure in the system of the device. The drawing shows the scheme of the proposed device. The device consists of a tank / with a manual pump 2 for air injection mounted therein, a pressure gauge for monitoring air pressure, a pipe 4 for supplying air to the measured gap and a device for recording the value of the measured gap. The latter is a chamber 5, connected to the pipe 4 by a hose 6, which at its end carries the calibration hole 7 and overlaps the rod 8 of the spring-loaded diaphragm of the gearbox 9. The chamber 5 is equipped with a pressure gauge 10 and a check valve 11. The instrument is as follows. Air is injected into the tank with some overpressure, which is checked with a pressure gauge L. After opening the valve 12, the air from the tank / fills the pipe 4 and through the measured gap goes into the atmosphere, does not penetrate into the chamber 5, as the air pressure in the tank / hose 6 will be covered by the gearbox 8 of the gearbox 9. When the system pressure drops to a certain value due to the gearbox spring, air enters the chamber 5. Then the air simultaneously passes through the measured gap to atmospheres and through the calibration opening 7 into the chamber 5, with narastayush, its pressure in the chamber 5 deflects the arrow 10. The action of the pressure gauge device when the BQ .prekraschaets equal pressure throughout the system. Thus, the device records the difference in the quantitative air flow through the measured gap and the calibration hole to the device that registers during the pressure drop in the instrument system, which characterizes the ratio of the areas of the measured gap and the calibration hole. mepei and gaps in the joints of parts by blowing air through the measured gap using a tank equipped with a pump, a manometer and a pipe dm supplying air to the gap being measured, and devices for recording the size of the gap differing; and with the fact that, in order to determine the size of the measured gap during the period of pressure drop in the instrument system, by the difference of the total air flow through the measured gap and the calibration hole recorded, its adaptation, the latter is made in the form of a chamber equipped with a manometer connected to pipeline through a rubber carrier at one end of the calibration hole of the hose, overlapped by the stem of the spring-loaded diaphragm of the reducer with decreasing air pressure p. tank to the limit due to the membrane spring. Claim 1, characterized in that a check valve is installed at the bottom of the chamber of the recording device to prevent air from escaping from the chamber when the pressure in it exceeds the pressure in the system of the device. BACKGROUND OF THE INVENTION 1. A pneumatic instrument for out of 2. The shape of the instrument according to