SU1247600A1 - Device for testing seals - Google Patents

Description

i

The invention relates to a testing technique and can be used to study piston and rod seals.

The aim of the invention is to expand the functional capabilities of the installation by obtaining the pressure of the working medium directly in the area between the seals and the sun of the cylinder and rod composed of different materials with different degrees of processing.

Figure 1 shows an installation for testing seals; Fig. 2 is an embodiment of the installation.

The installation includes a movement mechanism 1, a cylinder 2, a rod 3. At the same time, the inner surface of cylinder 2 and rod 3 are respectively stepped to form cavities 4j5 and 6 between them, which are connected to reservoir 10 by means of pipelines 7, 8 and 9, in which there is C5cat gas. In addition, reducing valves 11, 12, and 13 and check valves 14, 15, and 16 are installed at the inlet of the cavities 4.5 and 6 on pipelines 7, 8 and 9. The cylinder is placed in ball guides 17 and is rigidly connected to an elastic beam 18

To measure the frictional force, the steps of the rod 3 are interconnected by an elastic link 19 with a strain gauge. The same sensor is also placed on the elastic beam 18. The pressure in the cavities 4.5 and 6 is controlled by the sensor 20. All sensors during operation send a signal to the measuring system 21. The test seals 22.23 and 24 can be installed both in the cylinder and on the stock.

In addition, both cylinder 2 and rod 3 can be made of composite materials from different materials with different machining accuracy.

The installation works as follows.

When the rod 3 is in the extreme left position, the pressure of the working medium in cavities 4.5 and 6 has a certain initial value P,, P, manually set by the reduction valves 11,12 and 13 automatically supported by check valves 14,15 and 16. When moving the rod 3 to the right, the volume of the cavities 4.5 and 6 decreases and the pressure of the working medium in them increases. At the extreme left

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the position of the rod 3, the volume of the cavities 4, 5, and 6 becomes minimal, and the pressure of the working medium is maximum with the value of P, P, P,

1 g g Espy working environment - clean gas,

This compression is assumed to be adiabatic and the value of maximum pressure is determined by the formula

R,

V (- -) V,

five

five

0

where V and V are respectively the maximum and minimum volume of cavity 4; K - adiabatic index

for a given gas.

During the return stroke of the rod 3 in the cavities 4,5 and 6, the expansion of the working fluid to the initial volume and pressure occurs, however, during compression, there is some leakage of the working medium through the sealing seals 22, 23 and 24, and the pressure in the cavities 4.5 5 and 6 with the extreme left position of the rod 3 will be slightly below the initial P,,,. At this point, recharge occurs: check valves 14, 15, and 16 open and pass in the cavity 4.5 and 6 the amount of working medium, equal to the leakage, and the pressure in the cavity is 4.5 and 6 with the leftmost position of the piston rod 3 takes the value of P, P, P /. At the next double stroke of rod 3, the compression-expansion-feed cycle is repeated. By adjusting the reducing valves 11,12 and 13 of the check valves 14,15 and 16, it is possible to install in the cavities 4.5 and 6 any initial pressure P, P, 1 J whose maximum value is limited by the Pressure in the tank 10.

Any pressure change in cavities 4,5 and 6 is monitored by sensor 19. The frictional force of the tested seals 22 and 23 on the working surfaces of the rod 3 or cylinder 2 is determined by the deformation of the beam 18 and the elastic link 19 on which the load cells are glued. The signals from all the sensors of the hearth ZTS in the measuring system 21.

 The installation makes it possible to simultaneously test seals of different sizes, at different pressures, in contact with different materials, having 1: besides, different roughness.

0

0

55

/ h

23If 22f 5 2

FIG. 2

Editor A.Dolinich

Compiled by A. Beltsova Tehred and Gaydosh

Order 4105/35 Circulation 880 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

  .gt- t 1 - - - - II ill I II - - - Production and printing company, Uzhgorod, ul. Project, 4

Proofreader A.Zimokosov

Claims (2)

1. INSTALLATION FOR TESTING SEALS, comprising a cylinder with test seals and a piston _; wherein the cavity between the seals is connected to the gas pressure source by a pipeline, characterized in that, in order to expand the installation functionality, the inner surface of the cylinder and piston are stepped, and the cavity between the seals is formed by the steps of the cylinder and piston, and a check valve is installed in the said pipeline . 2. Installation according to π.1, with the fact that the cylinder and piston are made of composite materials of different stages with different processing accuracy. with lg SU „1247600 Fig, 1