SU1418519A1 - Bed for testing hydraulic units for susceptibility to fouling - Google Patents

Abstract

The invention makes it possible to ensure the constancy of the abrasives. St-in the working fluid when tested. The tank 1 with contaminating particles and the tank 2 communicate with the inlet of the tested hydraulic unit (HA) 4 through pumps 12, 11 and check valves 9, 10, respectively. A filter 5 is installed between the pump 11 and the valve 10. The total flow of the working fluid from the two n-pumps comes from the outlet of G.A. 4 to the tank 2, from which contaminating particles enter the filter 5, where they are absorbed. T. equipment, the repeated influence of the same particles on HA 4 is excluded. 1 Il. S

Description

13

(L

SH) SP

with

The invention relates to mechanical engineering, in particular, to stands for testing the elements of a volumetric hydraulic drive for sensitivities (contamination.; The purpose of the invention is to ensure the consistency of the abrasive properties of the working fluid and when tested.

I The drawing shows the layout of the test stand for testing hydraulic units. ; The stand contains a tank of 1 with contamination particles and a tank 2 with a working fluid communicated with inlet 3 of the tested hydraulic unit 4, a filter 5 installed in the hydroline 6 of the tank 2

1G

hydraulic unit 4, drain

with test hydroline 7; at output 8 of test hydraulic unit with tank 2. In this case, the stand is equipped with two check valves 9 and 10, as well as two pumps 11 and 12, each installed in one of lines 6 or 13 of the test hydraulic unit 4 with tank 2 and capacity 1, respectively, and connected to input 3 of the hydraulic unit 4, each through the return {Lanan 9 or 10, respectively. When the filter 5 passes, the liquid from the pump 11 enters the inlet 3 of the unit in question 4 through the hydraulic line 14. A protective valve is provided to protect the machine from damage in case of filter blockage 5 15.

The stand operates as follows;

When the pump is working AND the working fluid enters the tank 2 through the hydrolines 6 and 14 through the full-flow filter 5 and the return lanan 10 to the inlet 3 of the hydraulic unit under test 4. At the same time, the inlet 3 of the hydraulic unit A is pumped out of the pump 12 from knowing the liquid with particle concentration Cj and standard size uz, passage through hydrolines 13 and 14 through non-return valve 9. After passing the tested hydraulic unit 4, the total flow of working fluid from two pumps 11 and 12 comes from outlet 8 of hydraulic unit 4 to the drain hydroline 7, and then in b ak 2. When testing, the contaminating parts - 1Y, previously acting on the test unit 4, are absorbed by the filter 5, and for supplying the contaminating liquid to

0

five

0

five

0

input 3 of the hydraulic unit 4 re-enter the particles from the tank 1.

Thus, testing is carried out with the exception. the repeated influence of the same particles, gradually changing their initial size, on the hydraulic unit under test 4.

Under the condition of normal operation of the stand (filter 5 is contaminated to an acceptable level) when the flow through the safety valve 15 is absent, the concentration of contaminating particles C at the inlet 3 of the hydraulic unit 4 can be determined by the formula

C - Qi g

.

where C, is the concentration of contaminating particles at the entrance to the tested hydraulic unit;

Сg, —concentration of contaminating particles at the inlet to the pump, contributing to the working contamination fluid; Q, - working fluid flow through

the tested hydraulic unit; Q is the volumetric flow of the pump contributing to the working contamination fluid,

moreover, Q., Pr. + Pz-0. where Qs is the flow of the pump that does not introduce contamination into the working fluid; Qg - flow rate of the working fluid through the safety valve.

Claims (1)

Invention Formula Test bench for hydraulic units for susceptibility to contamination, including a tank with contaminating particles and a tank with a working fluid, communicated with the input of the test hydraulic unit, a filter installed in the hydraulic line connecting the tank with the test hydraulic unit, discharge hydraulic lines connecting the output of the test hydraulic unit with the tank , characterized in that, in order to ensure the stability of the abrasive properties of the working fluid during the test, the stand is equipped with two check valves and two pumps, each installed in one of the lines with communication with the hydraulic unit of the test tank and the container and connected to the input of each hydraulic unit via a check valve.