JPH02185623A - Nozzle angle adjuster for variable delivery supercharger - Google Patents

Abstract

PURPOSE:To make it possible to cool a nozzle shaft and dispose the nozzle shaft at a lower temperature section by supporting the nozzle shaft freely rotatably near a water jacket of bearing wheel chamber. CONSTITUTION:A nozzle shaft 35 is supported on a water jacket 27 side of a bearing wheel chamber 3. This causes water flowing through the water jacket 27 to cool and lower the temperature of the nozzle shaft 35. The heat of a nozzle 9 is prevented from being transmitted to a nozzle drive device 37 to prevent its temperature from rising. Because the nozzle drive device 37 itself is disposed at a bearing wheel chamber 3 section of a lower temperature in comparison with a turbine section 1, its temperature is also lower. Thus, damages on the nozzle shaft 35 and nozzle drive device mechanism 37 due to high temperature oxidation and wear are suppressed to improve durability and reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a nozzle angle adjustment device for a variable displacement supercharger.

[Prior Art] Currently, in order to improve the thermal efficiency of various types of prime movers, a supercharger is used in which exhaust gas from the prime mover turns a turbine, the turbine drives a compressor, and air compressed by the compressor is supplied to the prime mover. It is being

In the above-mentioned supercharger, the flow rate of the exhaust gas used as a power source varies depending on the load condition of the prime mover, so the angle of the blade called a nozzle that guides the exhaust gas to the turbine wheel is adjusted depending on the load condition. There is a variable displacement supercharger that maintains high supercharging efficiency by making it possible to maintain high supercharging efficiency.

A nozzle angle adjustment device for such a variable displacement supercharger will be explained with reference to FIGS. 4 and 5.

The variable displacement supercharger has a configuration in which a turbine section 1 and a compressor section 2 are connected through a bearing casing 3.

The casing of the turbine section l is constructed by sandwiching a shroud 6 between a turbine casing 4 and a gas outlet cover 5. A nozzle shaft 7 is rotatably held by the shroud 6 via a bearing 8, a nozzle 9 is fixed to the end of the nozzle shaft 7 on the side of the turbine casing 4, and a nozzle link 10 is fixed on the end of the nozzle shaft 7 on the side of the gas outlet cover 5.
is fixed.

A donut-shaped space I2 surrounding the gas outlet 11 is formed between the gas outlet cover 5 and the shroud 6, and a nozzle drive ring 13 is rotatably housed in the space 12 in addition to the nozzle link IO. A pin 14 and a slide joint 15 are protruded from the nozzle drive ring 13, and the slide groove 1B at the tip of the nozzle link 10 is fitted into the slide joint 15 so as to be slidable in the radial direction of the nozzle drive ring 13. are doing. Also, nozzle drive ring】3
A pin 17 and a slide joint 18 protrude from the nozzle drive ring 13, and a slide groove 20 on the tip side of the drive link 19 is fitted into the slide joint I8 so as to be slidable in the radial direction of the nozzle drive ring 13. The rear end of the link 19 is fixed to a drive shaft 22 that passes through the gas outlet cover 5 via a drive bearing 21, and a drive lever 23 is attached to the other end of the drive shaft 22.
is connected. In the figure, 24 is a turbine wheel, 25 is a compressor fan wheel, 2B is a turbine shaft, 27 is a water jacket, 28 is an oil supply hole, 29 is an oil drain hole, and 30 is a guide that guides the rotational movement of the nozzle drive ring 13. .

When the drive lever 23 is driven from an external drive source, the nozzle drive ring 13 rotates via the drive shaft 22 and the drive link 19, and the rotation of the nozzle drive ring 13 causes a rotation amount to be adjusted according to the amount of rotation of the nozzle drive ring 13. The angle of each nozzle 9 changes simultaneously by the angle via the nozzle link 10.

[Problems to be Solved by the Invention] However, in the above conventional nozzle angle adjustment device of a variable displacement supercharger, the nozzle drive ring 13, nozzle link lO1 drive link 19, etc. that constitute the nozzle angle adjustment device are Each part of the above-mentioned nozzle angle adjustment mechanism is They were susceptible to high-temperature oxidation and wear and tear and were easily damaged, lacking durability and reliability.

In view of the above-mentioned circumstances, the present invention aims to eliminate the effects of high-temperature oxidation and wear and improve durability and reliability by enabling cooling and being installed in a low-temperature part. The object of the present invention is to provide a nozzle angle adjustment device for a variable displacement supercharger.

[Means for Solving the Problems] The present invention provides a nozzle angle adjustment device for a variable capacity supercharger that is capable of adjusting the angles of a plurality of nozzles that guide exhaust gas to a turbine wheel. A nozzle angle adjustment device for a variable displacement supercharger, characterized in that a fixed nozzle shaft is rotatably held near a water jacket in a bearing casing, and a nozzle drive mechanism is attached to the other end of the nozzle shaft. It is something.

[Function] Since the nozzle shaft is cooled by the water flowing through the water jacket, heat from the nozzle is prevented from being transmitted to the nozzle drive mechanism.

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

FIG. 1 shows one embodiment of the present invention, and the parts in the figure with the same reference numerals as in FIGS. 4 and 5 represent the same parts.

A large and small 7 is attached to the side of the water jacket 27 of the bearing chamber 3.
Lunge 31. :12, and the larger flange 3
1 and the turbine casing 4, and a ring-shaped heat shield plate 34 is fixed to the surface of the smaller flange 32 on the turbine casing 4 side. Hot plate 34 and smaller flange 32
a nozzle shaft 35 extending in the axial direction of the turbine shaft 26;
is rotatably held via a bearing 36, and the nozzle 9 is fixed to the end of the nozzle shaft 35 on the turbine chamber 4 side.
A nozzle drive mechanism 37 is attached to the space 33 side of 5.

As shown in FIG. 2, the nozzle drive mechanism 37 has, for example, an isosceles triangular link plate 38 (T-shaped, Y-shaped, etc.) having three pivot points at the end of the nozzle shaft 35 on the side of the space 33. The top corners of the link plates 38 fixed to the adjacent nozzle shafts 35 are fixed, and the distance between one bottom corner and the other bottom corner is the same distance a from the top corner between the link plates 38 fixed to the adjacent nozzle shafts 35. When one link plate 38 is swung as a parallelogram-shaped link structure connected by a connecting plate 39 so that the length between the bottom corners is equal to the distance between the axes of adjacent nozzle shafts 3S, , the angle of the corresponding nozzle 9 changes via the nozzle shaft 35 fixed to the link plate 38, and at the same time: the coupling plate 39
The swinging motion is transmitted to the other link plates 38 through the link plates 38, thereby making it possible to adjust the angles of all the nozzles 9 all at once.

At this time, for example, the other end of the link plate 38 degrees is attached to the nozzle 9 degrees located most upstream in the flow of exhaust gas, close to the turbine inlet 40 of the turbine casing 4, and the other end of the link plate 38 degrees is attached to the nozzle 9'' located most downstream. An unconnected portion 41 to which no connecting plate is connected is formed between one end of the link plate 38'' to absorb the influence of dimensional tolerances and thermal expansion of the link plate 38, the connecting plate 39, etc.

Further, a link plate 3 attached to the nozzle 9' located closest to the turbine population 40 and most upstream in the flow of exhaust gas.
A drive lever 42 that projects outward at an angle of 8° is fixed, a drive device 43 such as an air cylinder is connected to the end of the drive lever 27 that projects outside, and the drive lever 42 is driven by the drive device 143 to drive the link plate. 38 to be able to swing.

Alternatively, the drive lever 42° may be fixed to an extension 44 of the nozzle shaft 35, as shown in phantom in FIG.

Next, the operation will be explained.

The nozzle shaft 35 is connected to the water jacket 27 of the bearing chamber 3.
Since the nozzle shaft 35 is held on the side, the nozzle shaft 35 is cooled by the water flowing through the water jacket 27, and its temperature is lowered. This prevents the heat of the nozzle 9 from being transmitted from the nozzle shaft 35 to the nozzle drive device 37, and prevents the nozzle drive mechanism 31 from increasing in temperature.

Further, the nozzle drive mechanism 37 itself is also provided in the bearing chamber 2 portion, which is lower in temperature than the turbine portion 1, and therefore has a lower temperature.

Therefore, damage to the nozzle shaft 35 and the nozzle drive mechanism 37 due to high temperature oxidation and wear is suppressed, and durability and reliability are improved.

FIG. 3 shows another embodiment of the present invention, in which the nozzle shaft 35° is extended to the compressor section 2 in substantially the same configuration as FIGS. The nozzle drive mechanism 37 is connected to a nozzle drive mechanism 37 provided in a donut-shaped space 33 formed between the two.

Even in this case, the same effect as in the above embodiment can be obtained,
Further, since the nozzle shaft 35° and the bearing 36 are cooled, the influence of thermal expansion is reduced even if the extension is extended, and the nozzle drive mechanism 37 is cooled by the air compressed by the compressor section 2, so that the nozzle drive mechanism 37 is lower than in the previous embodiment. temperature (approximately 150°C), the problem of high-temperature oxidation (occurring at approximately 300°C or higher) is almost completely eliminated, and lubricating oil (which carbonizes at approximately 200°C) supply hole 45 or 45° is provided. By performing lubrication, the problem of wear is eliminated, and the durability and reliability can be improved even more than in the previous embodiment (supply hole 45
is forced lubrication, and supply hole 45° is mist lubrication)
.

The nozzle angle adjustment device for a variable displacement supercharger of the present invention is not limited to the above-described embodiment, and the nozzle drive mechanism may include a nozzle drive ring shown in the conventional example shown in FIGS. 4 and 5. It goes without saying that various modifications may be made without departing from the gist of the Ikensui invention.

[Effects of the Invention] As explained above, according to the nozzle angle adjustment device for a variable displacement supercharger of the present invention, since the nozzle shaft is rotatably held near the water bowl and throat of the bearing chamber, the nozzle This has the excellent effect of preventing heat from being transmitted to the nozzle drive mechanism, preventing damage to the nozzle shaft and nozzle drive mechanism due to high temperature oxidation and wear, and greatly improving durability and reliability. .

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of one embodiment of the present invention, Fig. 2 is a view taken along the -■ arrow in Fig. 1, Fig. 3 is a side sectional view of another embodiment of the invention, and Fig. 4 is A side sectional view of the conventional example, FIG.
■It is an arrow view. In the figure, 2 is the compressor section, 3 is the bearing compartment, 9°9°, 9
" is the nozzle, 24 is the turbine wheel, 27 is the water jacket, 28 is the oil supply hole, 29 is the oil drain hole, 33°33° is the space, 35.35° is the nozzle axis, 37 is the nozzle drive mechanism, 45.45 ° indicates the lubricating oil supply hole.

Claims (1)

[Scope of Claims] 1) In a nozzle angle adjustment device for a variable capacity supercharger that is capable of adjusting the angles of a plurality of nozzles that guide exhaust gas to a turbine wheel, there is provided a nozzle shaft having one end fixed to the nozzle. 1. A nozzle angle adjustment device for a variable displacement supercharger, characterized in that: is rotatably held near a water jacket in a bearing casing, and a nozzle drive mechanism is attached to the other end of the nozzle shaft. 2) The nozzle angle adjusting device for a variable displacement supercharger according to claim 1, wherein the nozzle drive mechanism is provided in a space formed between the turbine section and the bearing chamber. 3) The nozzle angle adjusting device for a variable displacement supercharger according to claim 1, wherein the nozzle drive mechanism is provided in a space formed between the bearing casing and the compressor section. 4) The nozzle angle adjusting device for a variable displacement supercharger according to claim 3, wherein the space formed between the bearing casing and the compressor section can be supplied with lubricating oil.