JPS6137769Y2 - - Google Patents

Description

[Detailed description of the invention] Small superchargers are widely used in both diesel engines and gasoline engines, including marine, vehicle, construction machinery, and general-purpose applications.
From the viewpoint of energy conservation and exhaust gas emission measures, its value is increasing and it is attracting attention.

The present invention was developed with the aim of improving turbine efficiency in turbines for these small superchargers and reducing vibrational stress caused by exhaust gas pulsation exerted on blades of turbine impellers.

Figures 1 and 2 show an example of the prior art, which has two inlets: an inlet a' that communicates with a shorter volute chamber a, and an inlet b' that communicates with a longer volute chamber b. A two-port turbine casing c is shown. However, in the above-mentioned conventional technology, the tongue partition plate e that partitions the air introduction part to the turbine wheel d in the shorter spiral chamber a and the longer spiral chamber b is aligned with the plane perpendicular to the turbine axis. Since the tongue partition plate e is provided at right angles (parallel to the axis of the turbine), the inner end of the tongue partition plate e also faces the outer periphery of the turbine wheel d in a straight line parallel to the axis of the turbine wheel d. As a result, the arcuate length of the openings in the spiral chambers a and b relative to the outer periphery of the turbine wheel d is determined to be short, and therefore, in the two-hole turbine described above, the turbine efficiency is significantly reduced due to partial inflow. Ta. In addition, regardless of whether the tongue partition plate e is a two-port type or a one-port type, if the tongue partition plate e is provided at right angles to a plane perpendicular to the turbine axis, the inner end of the tongue partition plate e A portion where supercharging is no longer performed on the blade wheel d suddenly occurs, and the impact generated at this time causes the pulsating gas to generate an exciting force on the blades of the blade wheel d that rotate through the tongue partition plate e, causing the blades to could be damaged.

The present invention was made in order to solve the problems in the above-mentioned conventional technology, and the tongue partition plate for guiding the air introduced through the inlet and the vortex chamber to the turbine wheel is arranged perpendicularly to the turbine axis. This invention relates to a turbine casing for a small supercharger, characterized in that it is provided at an angle with respect to a plane.

Embodiments of the present invention will be described below with reference to the drawings.

3 to 5 show an example of the present invention, in which 1 is a two-port turbine casing, 2 is a short spiral chamber communicating with one inlet 3, and 4 is the other inlet 5.
6 is a turbine wheel, 7 is a long side spiral chamber communicating with
indicates the gas outlet. In the above configuration, the tongue partition plates 8 and 9 for partitioning the short side spiral chamber 2 and the long side spiral chamber 4 extend along the angle 2θ of FIG. It is inclined at an angle α with respect to a plane orthogonal to the plane.

As described above, the tongue partition plates 8 and 9 are provided so as to be inclined at an angle α with respect to a plane orthogonal to the turbine axis, so that the spiral chambers 2 and 4 are formed in an overlapping manner with respect to the outer periphery of the turbine wheel 6. In addition to being able to lengthen the supply length, it is possible to eliminate the point where supercharging suddenly disappears and gradually reduce it, thereby suppressing the decline in turbine efficiency during partial inflow as much as possible. The excitation force for the blades of No. 6 can be significantly reduced. Note that the angle range 2 in which the inclined tongue partition plates 8 and 9 are provided is
The larger θ (θ + θ) (for example, θ = 90°), the greater the expected effect, but on the other hand, the more the tongue partition plates 8 and 9 are inclined (the smaller the angle α), the better the quality of the cast product will be. It will be difficult to manufacture, so
It is considered that θ=30° to 60° is practical. Therefore, by using a method such as casting together the tongue partition plate member, the above-mentioned θ can be made considerably large. It should be noted that the present invention is not limited to the above-mentioned embodiment, but can also be applied to the tongue of a single-port turbine casing.

As described above, according to the turbine casing for a small turbocharger of the present invention, the tongue partition plate is provided so as to be inclined at an angle α with respect to a plane perpendicular to the turbine axis, so that the overflow of the volute chamber is prevented. By increasing the supply length, we can minimize the decline in turbine efficiency during partial inflow, and by eliminating the part where supercharging suddenly disappears, we can significantly reduce the excitation force on the blades of the turbine wheel, making it possible to It exhibits excellent effects such as being able to provide a highly safe supercharger that eliminates the risk of damage.

[Brief explanation of the drawing]

Fig. 1 is a side view of a two-port turbine casing showing an example of the prior art, Fig. 2 is a view taken in the direction of - arrow in Fig. 1;
FIG. 3 is a side view showing an embodiment of the present invention, FIG. 4 is a view taken from the − arrow in FIG. 3, and FIG. 5 is a − arrow view in FIG. 3.
It is an arrow view. 1 is a two-port turbine casing, 2 is a short side spiral chamber,
4 is a long side spiral chamber, 6 is a turbine wheel, and 8 and 9 are tongue partition plates.

Claims (1)

[Scope of utility model registration request] A turbine for a small supercharger, characterized in that a tongue partition plate for guiding air introduced through an inlet and a swirl chamber to a turbine wheel is inclined with respect to a plane orthogonal to a turbine axis. Vehicle compartment.