SU850948A1 - Stand for investigating servicability of elastic seals of pneumatic apparatus seat locking members - Google Patents

Description

The invention relates to devices for testing and examining seals and can be used in valve industry when conducting comparative tests of experienced seals, for example, rubber ones for operability, and for working out new designs of sealing elements.

A stand is known for investigating the performance of elastic seals of the saddle-shut-off organs of the pneumatic equipment, containing a high pressure source, pneumatic equipment simulator, the plugged cavity of which is connected to a high pressure source, supply pipelines with pore fittings and measuring equipment 11.

The known stand provides testing of the reinforcement only in its open or closed position, which does not allow to investigate the performance of the elastic seal of the saddle valve in the transient response of the reinforcement. The purpose of the invention is to study the performance of elastic seals under transient conditions.

This goal is achieved by the fact that the stand is equipped with an additional pneumatic equipment IMTagoram, the subvalvular cavity of which is connected to a high pressure source and parallel to the subvalvular cavity of the main simulator, and the output cavities of both simulators are connected to the drainage, while the main simulator is equipped with a mechanical drive, and the additional hydraulic, N

ten

FIG. 1 shows a basic stand; in fig. 2-node I in FIG. four.

The stand contains the main and additional simulators 1 and 2 of the pneumatic equipment with the tested rubber-metal valves 3 and fixed seats 4, the heat exchanger 5, valves 6 and 7. In the main simulator 1, the indicator 8 is installed with a threaded

20 by a pair consisting of screw 9 and nut 10. Valve 3 of simulator 2 is mechanically connected to piston 11 of hydraulic cylinder 12. Hydraulic cylinder 12 is equipped with fittings 13 and 14 for supplying working fluid.

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Claims (1)

In the hydraulic cylinder 1, a capacitive displacement speed sensor 15 is installed with a record of readings on the secondary device 16. The pressure is recorded before and after the test seal is realized by pressure sensors 17 and 18. The flow rate is set by replaceable pre-otted nozzles 19. The sub-valve cavities 20 of simulators i and 2 pneumatic equipment are connected to a high-pressure source (not shown) by supply lines 21.. The output cavities 22 of simulators 1 and 2 are diverting pipes; the main pipelines 23 are connected to a drain (not shown). The stand is operated as follows. Simulator 1 records the moment when the sealing surfaces are touched (the profile of the seat 4 and the valve 3 under test) and the indicator 8 is recorded. When the valve 7 is opened, the working medium passing through the heat exchanger 5 gets the valve 3 under test and the difference is fixed by indicator 8 the indications arising from the presence of axial backlashes and sm of contact surfaces under load. Rotation of the nut 10 and the screw-9 according to the indications of the indicator 8-Determine the amount of insertion of the seat profile into the test seal until complete; sealing sealing surfaces by detecting the pressure drop across the saddle block element with pressure sensors 17 and 18. At various fixed values of the introduction of the profile of the saddle, the test object was tested for RESISTANCE to the influence of the working medium flow, measuring the pressure drops 17 and 18 and determined by indicator 8 the zone of destruction of the transient process, i.e. 4, in which the gas flow carries out erosional destruction of the elastic seal with this design of the closure body, and removes the characteristic of erosional structure (by a decrease in volume or mass) from the size of the steam inlet meters of gas flow, material of elastic compaction, design of the saddle - locking bodies. The control pressure, the fluid entering simulator 12 of simulator 2 through fittings 14 and 13, when the working medium is supplied by valve 6, ensures that the seal is introduced into the seat profile by an amount determined in the first simulator1 6, which ensures the tightness of the saddle valve. . The control pressure moves the piston 11 of the hydraulic cylinder 12. The speed of movement of the saddle-locking member, for example, throttle devices, is investigated. speed sensor 15 on the secondary device 16 and at the same time measuring the rate of change of the working pressure differential sensors 17 and 18 and the flow rate of the nozzle 19. Thus, the structure of the stand allows: to investigate the mechanism of degradation of the rubber sealing seat-locking bodies determines the effect of elastically stiffness, viscous material properties, conditions affecting the gas flow conditions and design factors espluatatsii sealing elements on the resistance of a rubber seal; develop recommendations for the design of seals to ensure operability under the conditions of the erosive effect of the gas flow; establish the service life of elastic seals in the pneumatic assemblies for various purposes. Claims of Invention Stand for investigation of performance, elastic seals of the saddle-closing organs of the pneumatic apparatus, comprising a high pressure source, a simulator of a pecke apparatus, a valve; the cavity of which is connected to a high pressure source, supply and discharge pipelines with stop valves and measuring instruments, characterized in that, in order to investigate the performance of elastic seals under transient conditions, the stand is equipped with an additional pneumatic equipment simulator, the percolator cavity of which is connected to a high pressure source parallel to the valve-valve cavity of the main simulator, and the output cavities of both simulators are connected to the drainage system, while the main simulator is equipped with a mechanical skim drive, and optional - hydraulic. Sources of information taken into account in the examination 1. USSR author's certificate. 529307, cl. F 15 B 19/00, 1973.