RU2544898C1 - Fan impeller - Google Patents

Abstract

FIELD: transport.

SUBSTANCE: fan impeller consists of drum with blades rigidly connected to it and reinforcement ribs. New in this structure is that on side surfaces of impeller hollow ring with spheric rolling bodies inside it is fixed.

EFFECT: elimination of unbalance impellers of diesel locomotive engine cooling system fans.

3 dwg

Description

The present invention relates to the field of rail vehicles and can be used in the construction of cooling systems for diesel engines of main and industrial modern diesel locomotives.

The impeller fan of the U2 model is known, which is used in the design of the cooling system of the power plant of diesel locomotives TEM1, TE2, TGM1 and TE3 (see the book Design and Dynamics of Diesel Locomotives. Ed. 2nd, additional, edited by Ivanov V.N. M. : Transport, 1974), where on p. 91, fig. 52 it is described and shown. Such a wheel, for example, used in the diesel engine cooling system of a TE3 diesel locomotive, has an outer diameter of 1600 mm, rotates at a frequency of 1380 min ^-1 and consists of a stiffening collar, blades, fairing, drum, and stiffening ribs. Despite the simplicity of the design of such a blade wheel, as well as its effective use in practice, the latter has a significant drawback, namely, that in operating conditions, rotating at a rather high frequency of the order of 1380 min ^-1 , it due to its imbalance works in the field of vibration and beating. Such phenomena reduce the service life of the drive mechanism, increasing noise in operation, etc. To eliminate the imbalance of such a blade wheel in practice, it is subjected to both static and dynamic balancing with the installation of balancing weights on its drum. Unfortunately, this balancing method is not effective, because after a certain amount of operating time due to wear of the drive bearings and other defects, the balancing is violated and, therefore, it is again necessary to carry out balancing of the wheels on special balancing machines.

Also known is the impeller fan of the UK-2M model with an outer diameter of 2000 mm and a rotational speed of 1160 min ^-1 used in the cooling system of a diesel engine of a 2TE10L diesel locomotive, described and shown in the book of authors Zhilin G.A., Melinov M.S., Rodov AM and other passenger locomotive TEP60. Ed. 3rd rev. and add. M .: Transport, 1976, pp. 142-143, Fig. 60. The design of such a wheel is generally similar to that described above and therefore their disadvantages are similar.

Therefore, the aim of the invention is to eliminate the imbalance of the impeller wheels of the fans of the cooling system of diesel locomotives at sufficiently high speeds of rotation, which occurs in automatic mode.

This goal is achieved by the fact that on the end surfaces of the blades of the impeller in its horizontal plane, at points lying on the longitudinal lines passing through their centers of gravity, a hollow circular ring is rigidly fixed and rolling bodies of a spherical shape are movably located in it, with a vertical axis the symmetry of the ring coincides with a similar axis of symmetry passing through the geometric center of rotation of the impeller as a whole.

Figure 1 shows the impeller, a top view, figure 2 is also part of it, but with a cut along AA, and figure 3 is its design diagram.

The impeller consists of a drum 1, blades 2 and stiffeners 3. To the blades 2 with the help of the plates 4 a hollow ring 5 is rigidly fixed, in which the rolling bodies of the spherical shape 6 are movably located.

, где m₁ρ=Δ₁. Одновременно на тела качения сферической формы 6 (на расчетной схеме фиг.3 для упрощения они показаны как одно тело качения массой m_ш) также будет действовать центробежная инерционная сила $$P_{циш}=m_{ш}r{\omega }_r^2$$

, где m_ш r=Δ₂, а Δ₂ является динамическим противовесом. Известно, что уравновешивание массы m_ш произойдет тогда, когда масса m_ш займет положение, расположенное в плоскости XX, проходящей через центр вращения колеса О и центр тяжести неуравновешенной массы m₁, или же в плоскостях ОХ' $$(O{X}_1^{\text{'}})$$

, расположенных к ней под углом α, который и определяет положение динамического противовеса Δ₂ и зависит от разницы масс m₁ и m_ш. При изменении частоты вращения ω_к лопастного колеса угол α в автоматическом режиме будет корректироваться, что и обеспечит надежную балансировку лопастного колеса, вращающегося с заданной скоростью его движения.The impeller operates as follows. At the initial moment of time, when it is at rest, rolling elements of a spherical shape 6 are located in any part of the hollow ring 5 of the wheel, as shown in figure 1, while grouping there as a group or fragmented. During operation of the drive (it is not shown in the drawings), the impeller rotates in the direction of arrow B, and the rolling bodies of spherical shape 6, as their angular velocity ω _k increases, have a lower angular velocity ω _w due to the inertia forces P _n acting on the latter, forces of own weight P _G and forces of harmful resistance P _BC . At the same time, the driving force R _D acts on the rolling bodies of a spherical shape 6, which is directed towards the rotation of the fan blade wheel in the direction of arrow B (see Fig. 1) and arising due to the presence of rolling friction forces between them and the inner surface hollow ring 5. Suppose that the impeller has an imbalance Δ ₁ , manifested by the unbalanced mass m ₁ , and then the centrifugal inertial force P _cyt1 from it is determined $$P_{c\mathrm{and}t\mathrm{one}}=m_{\mathrm{one}}\mathrm{<figure-callout\; id="2"\; label="\rho \; \omega \; \rho "\; filenames="00000004.png,00000005.png"\; state="\{\{state\}\}">\rho \; </figure-callout>}{\omega }_{\rho }^{}{}_2^{}$$

, where m ₁ ρ = Δ ₁ . At the same time, a rolling body of a spherical shape 6 (for simplicity, they are shown in the design diagram of FIG. 3 as a single rolling body of mass m _w ), a centrifugal inertial force will also act $$P_{c\mathrm{and}w}=m_w\mathrm{<figure-callout\; id="2"\; label="r\; \omega \; r"\; filenames="00000004.png,00000005.png"\; state="\{\{state\}\}">r\; </figure-callout>}{\omega }_r^{}{}_2^{}$$

where m _w r = Δ ₂ and Δ ₂ is a dynamic counterweight. It is known that the balancing of the mass m _w will occur when the mass m _w takes up a position located in the plane XX passing through the center of rotation of the wheel O and the center of gravity of the unbalanced mass m ₁ , or in the planes OX ' $$(O{X}_{\mathrm{one}}^{\text{'}\text{'}})$$

located to it at an angle α, which determines the position of the dynamic counterweight Δ ₂ and depends on the difference in masses m ₁ and m _W When changing the frequency of rotation ω _{to the} impeller, the angle α will be automatically corrected, which will ensure reliable balancing of the impeller, rotating at a given speed of its movement.

The technical and economic advantage of the proposed technical solution in comparison with the known ones is obvious, since as the unbalanced masses of the impeller masses of the fan wheels of the cooling systems of diesel locomotive power plants change, the latter will always be balanced automatically.

Claims (1)

Fan blade, mainly of the locomotive’s power plant cooling system, consisting of a drum with blades rigidly attached to it and stiffeners, characterized in that on the end surfaces of the blades of the blade wheel in its horizontal plane, at points lying on the longitudinal lines passing through the centers their severity, a hollow circular ring is rigidly fixed and rolling bodies of a spherical shape are movably located in it, and the vertical axis of symmetry of the said ring coincides with like these are symmetry axis passing through the geometric center of the impeller rotation as a whole.

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