SU740976A1 - Surging preventing system for turbocompressor - Google Patents

Description

The invention relates to turbocompressor engineering, in particular, to designs of anti-surge systems.

Known anti-surge turbocharger systems in which oil is used as the working fluid, and the ⁵ isodromic block is made in the form of a piston damped by the throttle [1].

Odnyko small clearances reduce the reliability of the system, since the contact load in the gap between the piston and buk- ⁰ soi Jamming occurs piston.

The closest to the invention in terms of technical essence and the achieved effect is a turbocharger anti-surge system containing a proportionality unit with a main nozzle and a flat spring located in it and an isodromic unit with two cavities separated by a hydraulic sealing piston ^] ₂₀ However, when using this system as the working fluid of water decreases the accuracy of regulation and reliability.

"5

Nel inventions - improving accuracy and operational reliability.

This is achieved by the fact that the anti-surge system additionally contains a constant air pressure unit in the form of a reducer, throttles and two coaxially arranged nozzles, connected to the cavities of the isodromic block, and two shutters mounted on a flat spring and installed respectively between the coaxially located nozzles and in front of the main nozzle, and the spring is fixed cantilever.

The drawing shows a schematic diagram of an anti-surge system.

The system consists of a proportionality unit 1, inside of which a membrane 2 is placed, connected to a pulse bellows 3, a sealing bellows 4 and a flat spring 5, on which there is a shutter 6, which regulates the opening of air nozzles 7 and 8 and a shutter 9, which regulates the opening of the main nozzle 10, PID block 11 and disposed therein gidrouplotnenno- ^1st piston 12 connected to the rod

13, at the end of which goods are suspended

14. A lever 15 is also connected to the stem 13, to which _{5 a} cam 16 is rigidly attached, rotating around the axis 17. The nadporshne cavity 18 and the under-piston cavity 19 of the isodromic unit are connected to the constant pressure unit, which includes nozzles 7 and 8, as well as throttles 20 and 21, connected to an air reducer 22, to the input of which air is supplied from the factory network.

The membrane 2 is connected to the flowmeter device 23 through a differential divider consisting of a washer 24 and an adjusting throttle 25. The internal cavity of the bellows 3 is connected to the discharge line of the compressor, and the internal cavity of the proportional block is connected to the atmosphere through window 26.

The system operates as follows. During normal non-surge operation of the sip compressor, created by the differential pressure on the membrane 2, creating more of my air pressure in the bellows 3, as a result of which the nozzles 10 and 8 are fully open, the exhaust valve is closed, the piston 12 is in the upper position. With the onset of surging, the force created by pressure on the bellows 3 becomes: more than the force created by the differential pressure, singing on the membrane, as a result of which the shutters 6 and 9 move to the right and cover the nozzles 8 and 10, which leads to a quick partial opening of the exhaust valve and movement piston 12 'where r _n ^P 2 θ _Γ ρ

OR

- the area of the piston 12;

- pressure above the piston;

- pressure under the piston;

- weight of moving parts (loads, piston with rod, lever)

U).

P

From equation (2) it follows that the equilibrium position of the piston 12 (and therefore the entire system) can only be at a constant difference (E) -Pa.) "Since G _rp ^x const and F _n -const Since the pressure values C, and Pg are unambiguously set off from the relative position of the shutter 6 and nozzles 7 and 8, then the equilibrium position of the system can be only with one position of the shutters 6 and 9, and therefore, a certain ratio of the air flow through the compressor and the pressure in the discharge line characterizing the surge margin compressor.

After surging, the flaps 6 and 9 slowly move to the left, which closes the exhaust valve. The change in the time of the isodrome is carried out by changing the flow areas of the chokes 20 and 21, as well as changing the settings of the gearbox 22.

This anti-surge system allows you to change the travel time of the piston of the isodromic block over a wide range (from 3 to 20 minutes), and also has increased operational reliability and accuracy due to the lack of low-down.

Opening the exhaust air valve puts the compressor in a stable area. When moving the piston 12 down, the cam 16 rotates clockwise and moves the nozzle 10 to the left, which leads to its closure and additional opening of the air valve, as a result of which the air flow through the compressor will increase and the pressure will drop. This causes the valves 6 and 9 to move to the left, and therefore, the pressure in the cavity 19 will increase and the pressure in the cavity 18 will decrease until the state of the piston 12 is balanced, for which the equation · (1) of pairs with a small radial clearance is valid .

Claims (2)

1. Turbokompressorostroeniv. Ed. Eliseeva V, A, L., Mechanical Engineering, 1970, p. 321, fig. one. 2. Turbokompressorostroenie. By ed. Eliseeva V.A. L., Mashinostroenie, 19 7O, p. 334, fig. 7, I lliJkaeuBatii№ ifnnfe fHt 9