UA66369U - Impeller of a centrifugal compressor - Google Patents

Abstract

An impeller of a centrifugal compressor includes main disc arranged as one part with blades, and cover disc, connected to each other by holding-fixing elements. The upper edges of the blades are equipped with holding-fixing elements integral with blades.

Description

аРы - - A Rrai, a moat compressor, in which way of changing the shape of dm? - - aRygya, implementation of known elements and a new form will be: p - height of the shoulder blade at a given radius r; 2 - completion of connections between elements, the number of blades is ensured. the possibility of increasing pressure, productivity and

The sign (-) shows that forces and moments are directed to the efficiency of the impeller. in the direction opposite to the rotation. Aerodynamic The problem is solved by the fact that the blade thickness of a known design is in the domestic impeller of a centrifugal compressor within (0.021-0.022)0- the outer diameter of the ring, which includes the main disc, made in one sa, and does not correspond to the optimal Aerodynamic whole with blades, and a cover disk, connected between

Yu.B., Kozachenko li, Turbocompressor, Poly- by the proposed useful model, upper faces 2008, p. 217, 239, should be within the limits of the tama, made in one piece with the blades. (0.010-0.015) of the outer diameter of the wheel, which / The task is also solved by choosing, based on its constructive para- fastening and fixing elements are made in the form of meters, which ensure high efficiency. cylindrical pins.

The closest in technical essence and the problem is also solved by the fact that the desired result is, selected as a prototype, fillets are made at the base of the pins, and the impeller of a centrifugal compressor, which disk has corresponding chamfers, is made on the cover. But it includes the main disk, made in one piece with | The advantage of the proposed design is the spacers and the cover disk, which are connected to each other by the through holes on the blades and mainly by fastening and fixing elements. disc

The proposed design of the impeller uses rivets that pass through the body as fastening and fixing elements, which allows you to exclude the main disk, the blades and the cover disk from the calculation of the blade thickness. parameter D is the amount of thickness increase

The thickness of the blades is determined by calculation, blades compensating for the weakening of the carrier, based on the specified relative thicknesses of the blade from the blade cut, determined by the perforation of the blade with aerodynamic design parameters and holes for rivets, since there is no need for blades with stability parameters against the effectiveness of compensation for the weakening of the bearing section for baths The axis of each rivet is located on the absence of holes in the blades and the main disc. thin (0.015-0.018) of the outer radius of the blade from In the proposed design, the thickness of the blade of the back wall of the blade. determined by formula (2):

According to the authors of the impeller-prototype 5 - ЦО;Ри;Ме), this design allows to slightly reduce the effect of only the function of the aerodynamic loading of the blades, to reduce the pressure loss at the corners, the inequality takes effect: the side wheel and to increase it Efficiency during operation of the 5-5 compressor in conditions with an increased content of mecha-! bib, nocturnal impurities, which are in the compressible gas. Aero- and reaches parameters b (0.010-0.013)0, that the dynamic thickness of the blades specified in applies the thickness of the blade to the aerodynamically optimal description is 0.0185 of the outer diameter. wheels (Patent KO 2015420, IPC gO4029/28, As a result, the pressure created by the wheels increases, efficiency and productivity increase.

The disadvantage of the known prototype design is As it is known, from the data: Zkkert B. Oesvne centro- in the fact that it, like the above-mentioned construction, is a compressor, translated from German. - M., action of the impeller, does not exclude the possibility of 1959. - p. 451, fig. 310, the productivity of the working weakening of the bearing section of the blades and the accelerator is determined by formula (3): the activation of the blades during operation, due to the perforation of the blades with holes M-55 E map, under rivets. This is due to the use of fastening and fixing elements in the form of rivets, where: 7 is the number of wheel blades that penetrate the body of the main disk, B is the height of the blades at the place under consideration, the blades and the cover disk. Therefore, when calculating n - the width of the channel between the blades, the thickness of the blade, it is necessary to take into account the parameter Ж - the speed of Kp), - the amount of increase in the thickness of the blade, compen- n - the elementary section of the width between the blades - the weakening of the load-bearing section of the blade, My. which is due to the perforation of the shoulder blade with holes for the rivets. In this regard, the well-known design of robots, the productivity of M increases with the increase of whose wheel also, like the above, does not allow the width of the interblade channels, which is achieved by eliminating the weakening of the load-bearing section of the blades by reducing the thickness of the blade at 7 x-sup. and their accelerated activation in the process of ex- This decision is well illustrated by the graph M - pluation, causes the need to increase the tov- Kp) drawing - Fig. 1 of the blades and, as a result, reduces the pressure, product- Technical result of the proposed design and efficiency of the impeller. of the impeller consists in increasing the production

The basis of a useful model is the task of increasing efficiency and pressure. improvement of the well-known impeller percent-

Centrifugal compressor impeller with blades 2, milling pins 3 on the upper faces of the blades, on which the cover disk is fixed, cylindrical the pins on which the pin is fixed 4 by unrivalling the pins, which are solid, the tear disk by unrivalling the pins, which are elements of the blades. solid elements of blades. To eliminate stress concentration in

To eliminate the stress concentration at the base of the pin between the pin and the vane, a chamfer is performed on the base of the pin between the pin and the vane, and on the cover disc - a corresponding chamfer, and on the cover disc - a corresponding chamfer. (not shown in the drawing).

To eliminate the effect of mechanical anisotropy, the impeller is placed on the shaft with tension and the properties of rivet materials, the main disc is fixed with a key. The assembled wheel is subjected to dynamic balancing. relative to the axis of the pins. Centrifugal compressor impeller

The essence of the useful model is explained by the drawing works as follows. - Fig. 2. When rotating the impeller, the blades 2 di-

In Fig. 2 shows the general view of the working unit for the pumped liquid or gas, as a result, the wheel in section. those by which the increase in pressure necessary for

The impeller of the centrifugal compressor of their movement. At the entrance to the impeller, a pressure is created, includes: the main disk 1, made in one complete charge, and at the exit - pressure.

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State Intellectual Property Service of Ukraine, st. Urytskogo, 45, Kyiv, MSP, 03680, Ukraine

SE "Ukrainian Institute of Industrial Property", str. Glazunova, 1, Kyiv - 42, 01601