The impeller of a centrifugal compressor

 

(57) Abstract:

The invention is intended for use in compressor engineering. The compressor contains blades. The latter is made of flexible sheet material of high strength. The blades have a flat shape. Each vane is fixed to its front part rigidly to the slat. The latter is part of the hub of the impeller of the compressor. The blade can be fastened in an articulated through the axis. The latter is installed in the hub of the impeller of the compressor. Provides increased efficiency, reduced cost and increased reliability of the compressor. 4 Il.

The invention relates to the field of production of compressors, namely, the working wheels of centrifugal compressors with adjustable blades.

Known impeller of a centrifugal compressor containing a supporting disk mounted on the outer edge of the blade and the regulating element. The latter is made in the form attached to the drive ring with an elastic petals, bent from disk and placed in front of the entrance edges of the blades. Ring installed in the groove of the drive flush with its surface.

At speeds close to the settlement, the petals under Deiss is Otsego body through the wheel.

With decreasing speed, the magnitude of the centrifugal forces acting on the petals of the ring is reduced, and the petals due to its elasticity deviate from the disk, thereby affecting the flow of the impeller.

Thus, in accordance with the change of the operation mode is the self-regulation of the compressor due to the elasticity of the regulatory element [1].

It is also known impeller of the centrifugal fan, containing a carrier and a coating disks placed between the shoulder blades, consisting of a rigid slat and elastic flap wound on fixed disks rotating axis and secured to it one end.

When the fan under the action of the centrifugal force of the elastic flap unwound from the axle. The full unwinding of the elastic flap prevents the spring. At the maximum rotational speed of elastic flaps fully unwound and has a maximum length. The invention allows to expand the range of capacity control fan [3].

Known also fan blade that contains a hard core part and fixed thereto one end of a flexible element, driven by the drum, the location performance fan [2].

As a prototype of the selected traditional design of the impeller of a centrifugal compressor with vanes traditional (hard) design. Depending on the availability of stocks and primary disk distinguish impellers closed, semi-open and open-type [5].

The disadvantages of the above centrifugal compressors are their bulkiness, complexity, and therefore the weighting structure and reducing their reliability.

The purpose of the invention is to increase the efficiency, the outlet pressure of the compressor wheel, to expand the area of sustainable performance, reduce weight, reduce cost and improve the reliability of the compressor.

To achieve this goal serves the impeller of a centrifugal compressor containing a carrier and a coating disks fastened between the blades, wherein the blades are made of thin, flexible sheet material of high strength, have a flat shape and each attached to its front part rigidly to the slat, which is part of the hub of the impeller of the compressor, or the hinge means axis installed in the hub. The presence of the coating and the primary drive is optional and based >/P>In Fig. 1 shows the impeller of the compressor blades attached to the hub with the axis of the cross section of Fig.2 - impeller of the compressor blades are rigidly secured to the slats of the hub, the cross-section of Fig. 4 - position of the impeller vanes at its operating mode (scapula take the working position under the influence of centrifugal forces), and Fig. 3 - position blade, folded under the action of the pressure of the working fluid (this mode is observed at the beginning of the unwinding of the compressor wheel).

The impeller of the centrifugal compressor includes a supporting disk 1, a covering disk 2, and is placed between the blades 3 attached to its front part to the hub 4 with the axis 5 or rigidly fixed to the slat 6, which is part of the hub.

When the unwinding of the compressor wheel blades under the action of centrifugal force will be rejected, seeking to take the form of radial rays (Fig.4), and under the action of the pressure of the working fluid (gas or liquid) will seek to snuggle up to each other (Fig.3). As a result, when a value of the number of wheel revolutions and parameters of the working fluid (density, viscosity, volumetric flow rate, and so on) Opredelenie pressure along the blade length is easy to provide a linearly increasing, what is considered the best option [4], using the blades of a material of constant thickness.

If you change the gas flow, that will also change the pressure distribution on the blades of the wheel, which will change the shape of the blades, i.e., the blade will tend to take the most optimal shape for wrapping that will reduce losses. Will be automatic regulation of the outlet angle of the blades.

The construction of the centrifugal compressor is easy and simple to manufacture.

The use of flexible blades enables automatic regulation of the compressor.

Due to the fact that the blades are made of thin sheet material (tape) their strength is higher than solid blades, made of similar material (similar to a high-strength belt spermaholics N. In.Gulia [6] compared with traditional flywheels design), which allows to increase the circumferential speed and outlet pressure of the compressor.

Due to the fact that the blades can be made of more durable materials, can significantly improve circumferential speed, and hence the pressure obtained in one stage of the compressor.

In the proposed design dramatically reduces the probability of failure of the compressor in the mode of surge, which is characterized by the reciprocating motion of the working fluid at the reduced flow of gas (or liquid). Since the impeller blades can be bent when a surge oscillations of the gas inside the compressor will not lead to the inevitable destruction of the structure. Due to the stability of the compressor to the mode surge you receive an opportunity to expand the range of costs, which can stably operate the compressor.

Sources of information

1. Description of the invention SU 1199978 And CL IPC F 04 D 29/28, 1973

4. Strizhak L. J. study of the effect of the form interscapular channels C.B. wheels on its characteristics. The dissertation on competition of a scientific degree K. T. N. L., ABI them. Kalinina, 1968, page 15

5. Seleznev, K. P., " Y. B. and other Theory and calculation of turbochargers: Textbook. a manual for students of engineering specialties. Leningrad: Mashinostroenie, 1986, page 178

6. Gulia N. In. The energy storage. M.: Nauka, 1980, 74 pages

The impeller of the centrifugal compressor containing a carrier and a coating disks fastened between rotor blades, wherein the blades are made of flexible sheet material of high strength, have a flat shape and each attached to its front part rigidly to the slat, which is part of the hub of the impeller of the compressor, or the hinge, through the axis installed in the hub.

 

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