JPS6135707Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a mechanism for preventing exhaust gas leakage from a nozzle shaft portion that pivotally supports a nozzle vane in a supercharger having variable blades on the turbine side.

Figure 1 is a partial sectional view showing the structure of a conventional nozzle shaft section, and is an enlarged view of the part corresponding to part A of the variable wing supercharger according to this invention in Figure 2. The high-temperature exhaust gas swirls around the scroll 1, changes direction when it hits the nozzle vane 2, flows into the turbine rotor 3, and rotates it. The turbine rotor 3, which is driven by engine exhaust gas, compresses air at atmospheric pressure and sends it to the engine by rotating a compressor impeller 4 attached on the opposite side of the same shaft. In order to maintain the best efficiency, the nozzle shaft 5 is variable, and is operated from the outside by a drive lever 6 attached to the outer end of the nozzle shaft 5.

The contact part 8 between the conventional nozzle shaft 5 and the back plate 7 is a cylindrical surface, and the high-temperature exhaust gas flowing into the nozzle vane 2 from the scroll 1 passes through the contact part 8 and flows out from between the bottoms of the bushes 9.
It contaminates the inside of the engine room, causing rust, and is not desirable from a pollution control perspective.

This idea was made in view of the above circumstances, and a spherical surface is provided at the contact area between the nozzle vane root of the nozzle shaft and the back plate through which the root penetrates to reduce the amount of gas leakage, and the leaked gas is absorbed into the exhaust gas. Gas leakage is prevented by discharging the gas to the downstream side of the turbine (for example, after the muffler) through the collecting hole.

An embodiment of this invention will be described in detail below with reference to FIG. In the drawings, parts corresponding to those of the conventional example will be described with the same reference numerals.

FIG. 2 is a sectional view of a variable blade supercharger showing an embodiment of this invention, with the left side being the gas turbine side and the right side being the compressor side. In this design, nozzle vane 2
The contact area 8' between the base of the nozzle vane 2 and the back plate 7 on which the nozzle vane 2 is pivotally supported is made into a spherical surface, and the gas leaking from this area passes through the exhaust gas collection hole 10 and is transferred from the part a to the downstream side of the turbine through a pipe or the like. released. In this case, by using a spherical seal, the flow path resistance between the scroll 1 (a spiral chamber through which high-temperature exhaust gas from the engine side passes) and the gas collecting hole 10 can be increased, and the amount of leakage can be suppressed as much as possible. In addition, the leaked gas is collectively discharged to the downstream side of the turbine (after the muffler, etc.) through the exhaust gas collecting hole 10 whose resistance is much lower than the flow path resistance of the contact portion 8'.
There is almost no leakage.

As explained above, according to this invention, the amount of exhaust gas leaking to the outside from the nozzle shaft part of the variable vane supercharger can be minimized, so that nearby equipment is prevented from rusting due to leaking exhaust gas, and This helps prevent pollution caused by leaked gas.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing the structure of a conventional nozzle shaft section, and FIG. 2 is a sectional view of a variable blade supercharger showing an embodiment of this invention. 2... Nozzle vane, 5... Nozzle shaft,
7... Back plate, 8, 8'... Contact part, 1
0...Exhaust gas collection hole.

Claims (1)

[Scope of utility model registration request] In a supercharger with variable blades on the turbine side,
A variable valve characterized in that a spherical surface is provided at the contact portion between the nozzle vane root portion of the nozzle shaft and the back plate through which the root portion passes, and gas leaking from the contact portion is discharged to the downstream side of the turbine through an exhaust gas collection hole. Gas leak prevention mechanism for wing-type superchargers.