SU1043497A1 - Device for checking pressure - Google Patents

Abstract

1. A DEVICE FOR MONITORING PRESSURE, comprising a housing divided into three chambers by two sensory elements, the first of which is equipped with a joint, a. On the second h, the damper, the first extreme chamber, the center of the body and the first sensing element, is connected to the indicator and through the choke to the power source. The second extreme chamber is connected to the cavity with controlled pressure, and a third chamber is connected to the atmosphere, characterized in that, in order to increase the reliability and accuracy of the device, the joint is made in the vice sleeve with a flange, and the first sensitive element is fitted with webs peripheral holes and a central opening, in which, loosely installed & on a sleeve with a flange, the spacer | .in the first chamber, and with an abutment located in the third chamber, a spring being installed between the anvil and the washer. 2. The device according to claim 1, which is based on the fact that, with the circuit for ensuring sensitivity adjustment, the emphasis on the sleeve is installed with the possible. by adjusting its position.

Description

The design is opened to the control and measurement technique and can be used in a device to control gas flow rates and airflow, for example, when testing for leaks.

It is known a device of a day control, a change in the pressure, an anchor body, disengaged by an ovum sensitive elements, on the first of which a nozzle is fixed, to three chambers, the first extreme chamber connected to the incirator and through the choke to the power source, and chamber with fitting l .15

The net of such a well-known device, CTiaa, is not sufficient in sensitivity and accuracy. This is explained by the fact that when the controlled pressure decreases, the nozzle is detached from the sensitive second membrane not with a gauge. A hysteresis loop appears between the activation and release pressures, which creates a dead zone within the pressure range, which is not controlled by 25;

The closest in technical suicidelt to the present invention is a device for controlling pressure, comprising a housing divided into three chambers, two to 30 meters, on. the first of which is installed the nozzle as well. n & the second is a flap, the first extreme chamber formed by the housing and the first sensitive element, 35 is connected to the indicator and through a cross-section. Spruce with power supply, the second is extremely connected to the cavity with controlled injection, a third. the camera is connected to the atmosphere 2J ... .ad

 The disadvantages of the known device

are its lack of sensitivity and reliability of operation. The sensitivity to work is due to the fact that the pressure equalization in the first extreme and in the intermediate chamber occurs only when the valve is periodically switched over at the output of the intermediate chamber.

on the line connecting the first extreme P chamber of the intermediate, And they rarely switch, i.e. with a long period

switch them with a high frequency i

It is impossible, since they are not designed for operation with a high switching frequency - limited to 55 Their resource, moreover, due to the presence of mobile, rather unerionic ones. elements is limited by their speed.

So, in the intervals between their switchings, there is no control over the position of the sensing element or the generation of pressure. The limited resource and the large number of moving elements in the valves of the device affect the reliability of the device as a whole. In addition to the TorOj device is difficult for KOHC-N. operation, manufacture and operation. The presence of parasitic or additional cavities in the valves and in the pipelines to them increases the inertia of the device and reduces its accuracy

Work, since over time the valve heats up and the air pressure in these cavities changes. Moving the valve actuators causes a pressure change in the said cavities, which also affects the workability. properties.

The purpose of the invention is the noi bnuemie of the accuracy and accuracy of the device. The end of the aim is achieved by the fact that in the device for controlling pressure, the nozzle is made in the form of a sleeve with a flange

 In the first sensing element, a washer is installed with vacuum shims in it with peripheral holes and a centrifugal - I

A bore with a flange located in the first chamber and with a stop located in the third chamber, with a tfich interfloor stop and a washer installed. spring.

In addition, the support of the sleeve is installed, with the possibility of adjustment, its position. .:

In the drawing isofazhena scheme of the intended device,

. The device for controlling pressure comprises a housing 1, divided into three chambers 2-4 by two sensitive elements 5 and 6, on the first of which a nozzle is installed, made in the form of a sleeve 7 with a flange 8, and on the second. spacing 9. The first extreme chamber 2, formed by the housing by the first sensing element, is connected to the front panel 1O and through the choke 11 to the power supply 12. The second extreme 3 is connected to the cavity 13 with a counter-welded central joint and the third chamber 4 through the opening 14 is connected to the atmosphere. On the first sensing element 5, a washer 16 is installed with peripheral 16 and central 17 I openings in it, and sleeve 7 with the flange and stop 18 located in the third chamber is freely installed after it. Between the stop 18 and the washer 15, a spring 19 is installed. The incicat 10 is connected with a light bulb 20. The cavity 13 through the pack 21 is connected with the channel 22 of the head. Sleeve 7 is a veterinary device The device works on special; . While the controlled discharge into the second extreme chamber 3 does not decay, the driver from the power source 12 through the circuit 11, the first extreme chamber 2, the sleeve 7 with the flange 8, the third campha 4 goes freely through the opening 4 into the atmosphere. At this time, the pressure in the first extreme chamber 2 is low and the lamp 2O at the output of the indicator 1O does not when a controlled pressure is applied. in the second extreme chamber 3 second. the sensing element 6 bends toward the sleeve 7, the pressure is first. chamber 2 rises, the first sensing element .5 in turn turns toward the second sensing element 6, the gap between the sleeve 7 and the shutter 9 decreases even at a certain value of controlled pressure, equal to the nominal, orifice 23; the sleeve 7 is closed and the pressure in to the measure 2 1 increases in 1 1, 1,:, which leads to the activation of the indicator 10 and the tan of the indicator memory 2O. At the same time, moving 7, the lower end of which is in contact with the flap 9, slows down, the first half of the clamping element 5 with the sleeve 7 conducts at almost the same speed; deform in the direction of the second sensing element 6, the spring 19 is compressed and after some time (| 41 between the flange 8 of the sleeve 7 and the washer 15 there is a gap. The air from the chamber 2 through this and the peripheral holes 16 enters the chamber 4, from which .. is discharged into the atmosphere. jEteB in chamber 2 drops sharply and the first sensitive element 5 with the washer 15 and the sleeve 7 begins to move away from the second sensitive element 6, the spring 19 is eligible for C11 and through the newly formed gap between the sleeve 7 l shutter 9 and hole m 23 additionally, air from chamber 2 is discharged into the atmosphere.Oriee-poses are closed, and since the newly formed gap between sleeve 7 and gate 9. is small, it is much smaller than the first one, then at the next moment in chamber 3 it rises again. If the pressure in the chamber C does not decrease, then the described process of shifting the first sensing element 5 with the washer-15 and the sleeve 7 is repeated and the lamp 2O is lit. Bulb 2 It does not go off when oscillating. They have no sleeves 7 and pressure in chamber 2, since the inertia of the indicator 1O is longer than the period of oscillation of sleeve 7. If the pressure in chamber 3 decreases, the second sensing element 6 will move in the direction of the housing. The slider, when the first sensing element 5 is mixed, in all the sensory senses of the 6. hole in the sleeve 23 does not close. The pressure in chamber 2 drops and indicator 10 is triggered. Indicator light 2O goes out. The technical and economic effect of using the proposed device is to increase the sensitivity and reliability of its operation. It provides automatic and constant tracking of the position of the BTOpwo sensing element. A movable sleeve, installed in the center hole of the washer, allows you to create a low-inertia device for equalizing the pressure on both first sensing elements, which in the pressure control mode (after giving pressure to the second extreme chamber) works as a generator. This device responds to an insignificant drop in controlled pressure. At the same time, the indicator ensures greater reliability of operation, since the device does not have complex kgpaws for increasing pressures on both sides of the first sensitive element. Moreover, the designation of pushing the sleeve to the washer allows for the grip, the sensitivity of the device and thereby significantly expand the range of the first and the proposed devices. W //// f ///////. 1 .Л / A / V C / Z // AW.

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Claims (2)

1. DEVICE FOR PRESSURE CONTROL, comprising a housing divided into three chambers! two sensitive elements, on the first of which a nozzle is installed, a. on the second flap, the first extreme chamber formed by the body and the first sensitive element is connected to the indicator and through the throttle to the power source, the second extreme chamber is connected to the cavity with controlled pressure, and the third chamber is connected to the atmosphere, characterized in that, with a chain for increasing the reliability and accuracy of the device, the soppo is made into a vice sleeve with a flange, and on the first 'sensing element there is a washer with peripheral holes made by a hole and a central hole in which a sleeve is installed with a flange located in the First chamber and with a stop located in the third chamber, and a spring is installed between the stop and the washer 2. The device according to π. 1, which is characterized in that, with a chain for providing sensitivity adjustment, the emphasis on the sleeve is mounted with an air brake. by the regulation of his position.