SU1401300A1 - Pressure indicator - Google Patents

Abstract

The invention relates to a measurement technique and makes it possible to improve the manufacturability of a device. The indicator shutter is made in the form of a continuous cylinder 5, in which two end-parallel deaf channels 6 and 7 are made from the ends. Before the indicator works, oil is poured into the annular groove 8 through channel 6 with a hole 9, which is then partially displaced into the measuring tube 3, squeezing air in it. At the end of the device operation, the oil from the tube 3 is forced out by compressed air back into the annular groove 8 and then through the opening 10 into the blind channel 7 and the channel 2 of the inlet fitting. The autonomous volume of oil remaining in the bore 8 isolates the tube 3 from the ingress of additional air during the operation of the hydraulic system. 2 Il. Q S

Description

(L

about

with

.2

l | l3o6pcTenne relates to measuring gauge, and in particular, can be used (b as an indicator of the pollution of the filter EJ hydraulic systems that have a filter on the drain, for example, in the hydraulic systems of attachments and steering control of tractors.

1 of the invention is to increase

manufacturability.

cher

23 which oil is drained into tank 14 of

would

drain pipe 15.

Before installing the indicator on the workplace, the annular groove 8 is filled with oil through the channel 6, removed into the pre-measuring tube 3. When the pump is in, the filter 13 is injected (Fig. 1) due to the fact that the filter has a certain resistance to flow oils. Under the action of izocarny pressure, part of the oil from the discharge pipe 15 enters the inlet port 2 of the indicator and then through channel 7 and sludge 10 into the annular groove 8. When the oil, which previously filled the annular point 8, is partially displaced through the anvil 9 and channel 6 to the measuring pipe is this

ku | 3, squeezing the air therein. As the filter becomes dirty, its resistance increases, which leads to an increase in the excess pressure and, as a result, an additional displacement of oil from the ring.

ia of FIG. Figure 1 shows the installation of a pressure indicator as an indicator of filter pollution in a hydraulic system; Fig. 2 shows a pressure indicator, section.

The pressure indicator consists of a housing 1, an inlet fitting with an inlet channel 2, a transparent plugged tube 3, connected: 1 with a nut 4 to the housing, and a cylinder 5 in Euida. In the cylinder there are two separating parallel channels 6 and 7, an annular groove 8 and two holes 9 and 1C. Hole 9 connects the blind end of the channel 6 with an annular groove 8. Hole 10 connects the blind end of the channel 7 20 as well with an annular groove 8. The tube 3 is labeled 11, the cylinder 5 is pressed into the body 1 of the inlet fitting. The indicator is mounted on the cover 12 of the filter 13,

8 grooves. The approach of the oil level in the tube 3 to the control mark 11 indicates the necessity of washing or replacing the filter elements.

When the pump is turned off, the overpressure in front of the filter 13 becomes zero. The oil from the tube 3 is forced out by compressed air there through channel 6 and hole 9 into the annular groove 8 and further through hole 10 and channel 7 into the inlet channel 10. When the air pressure in tube 3 decreases to its original value, the oil is forced out, but since the opening 10 is located in the upper part of the annular groove 8, the latter remains filled with oil. This volume of oil becomes autonomous after the oil flows through the filter 13 into the tank 14.

Due to the fact that there is an autonomous volume of oil in the annular bore 8, the proposed indicator can be installed anywhere in the drain line, since this volume reliably isolates the tube 3 from additional air volume when the hydraulic system is in operation. This provides an increase in the reliability of the indicator readings and, as a result, better cleaning of the hydraulic oil.

Claims (1)

Invention Formula The pressure indicator contains a sealed measuring tube plugged at one end, the other end of which is connected through a fluid-filled gate to the cylindrical cavity of the entrance tube, characterized in that, in order to increase the manufacturability, the gate is made in the form of a solid cylinder in which it is made from each of the the ends of one deaf axially parallel channel, as well as an annular groove and two holes connecting the blind end 40 of one of the channels with an annular groove, the cylinder with and clearly without clearance arranged in a cylindrical cavity of the fitting. 25 thirty 35