SU1229617A1 - Device for measuring static air pressure - Google Patents

Abstract

The invention relates to the measurement of a constant or slowly varying pressure of gaseous substances using instruments that are sensitive to the pressure of an elastic medium. The aim of the invention is to improve the accuracy and expansion of the functionality of the device. At the bent end of the receiving L-shaped tube 1 there is an annular gap 2 with an annunciator 15 of approach with an annular gap concentric with its outer surface. A thermosensitive element 3 with a scale indicator device 5 is installed in the inner cavity of the tube. A concentric rubber bulb 6 is installed on the outer side of the straight end of tube 1, which, through the non-return valve 9, forces air into the cavity 2 of the seal, ensures that it fits snugly to the edges of the test hole . In the case of vacuum in the cavity of the pear, air is blown over the thermosensitive element from the collector chamber of the traction motor. The cavity of the receiving end of the tube is connected by a connecting tube 13 with a differential pressure gauge 14. The mutual arrangement of the control S hole in the lower hatch of the traction motor and the bent end of tube 1 is controlled by a system of 17 L and 18 mirrors. t-11 and safety valves 12. 2 Il. N3 rsD CO 05 ipt / i.f: i

Description

The invention relates to the measurement of a constant or slowly varying ziaB- lasers of gaseous substances using instruments that are sensitive to the pressure of an elastic medium, or, more specifically, to measuring the static pressure of air in collector chambers of locomotive traction electric motors.

The purpose of the invention is to improve the accuracy and expansion of functionality.

FIG. 1 shows a device with a longitudinal section of the tube in the pressure measurement position; in fig. 2 - receiving end of a tube with a temperature-sensitive element installed in it and a seal in the hole of the lid of the lower hatch of a traction motor, a longitudinal section.

The device contains a receiving tube 1 L-shaped with a full seal 2 of elastic material, located with an annular gap concentric with its outer surface and fixed on the bent end, a temperature-sensitive element 3 installed in the inner cavity of the tube, connected by conductors 4 with a gauge showing device 5.

At the right end of the tube equipped with a concentric rubber core 6, the handle 7 is fixed, while this, through the non-return valve 8, is connected to the near end of the tube, through the second non-return valve 9 and the connecting tube 10 to the sealing cavity 2, and through the bleed valve 11 and the safety valve 12 installed on the discharge line with the atmosphere. The cavity of the receiving end of the tube is connected by means of a connecting tube 13 with a differential pressure gauge 14. At the receiving end of the tube, limiters 15 of the seal are made, and at the opposite ends of the straight section of the tube, two mirrors 17 and 18 are mounted on the hinges 16, which form the optical system. The optical system can be reconfigured by rotating the mirrors in the hinges 16.

The device works as follows. Controlling visually, through the system of mirrors 17 and 18, the mutual positioning of the control hole 19 in the lower hatch of the traction motor and the bent end of the receiving tube, the latter is inserted into the said hole for a distance determined by the presence of the stops 5, while ensuring the seal 2 about half the hole. Further, by compressing the pear 6 to the limit, air is pumped through valve 9 into seal 2. thereby ensuring that it fits snugly to the edges of the test opening, while the excess air volume contained in the pear in its initial state is discharged through a safety valve

0

j

five

0 Q

5 5

0

12. Then the pear is released and due to the vacuum created in its cavity, the thermal element is blown with air from the collector motor of the traction motor, in this case the valve 8 opens, connecting the pear cavity to the cavity at the end of the tube, valve 9 is closed, which allows to maintain pressure in the seal. Simultaneous measurement of pressure and temperature by means of a differential pressure gauge 14 and device 5 is carried out at the moment no; iHoro of the pear being filled with air. After being measured by pressing the button on the bleed valve I, air is blown out of the seal 2, as a result of which the tube is easily removed from the hole.

The application of the proposed design of the device allows significantly reducing the time spent on measuring the static pressure in the collector chambers of locomotive traction electric motors. Saving can be obtained additionally due to an increase in the accuracy and reliability of the pressure measurement due to a reduction in the time required to set up the ventilation systems, as well as a decrease in the failure of electric motors as a result of their overheating caused by incorrect measurement of the static pressure value (its overstatement) and their consequent misuse.

Claims (1)

Invention Formula A device for measuring the static air pressure in the collector chambers of the locomotive electric motors, comprising an L-shaped receiving tube with a restriction on its movement and a coaxial elastic seal at the receiving end and a differential pressure gauge connected to the second end of the tube, characterized in that increase accuracy and enhancement of functionality; it is equipped with a temperature meter with a indicating device, a rubber boot, two non-return safety and release valves, and The smoldering is hollow, with the cavity of the rubber crush being gshevmatically connected through one non-return valve to the second end of the suction pipe, and through the second non-return valve to the sealing cavity, which communicates with the atmosphere through a safety valve and bleed in parallel. The yeni tube is made in the form of a bearing site coaxially sealed at the level of its middle part, and a temperature meter is installed in the tube cavity at its receiving end. (  at / / /five fff Figg