JPS5893903A - Variable inlet guide vane - Google Patents

Abstract

PURPOSE:To easily obtain an optimum inflow condition to a moving blade, by constituting a variable inlet guide vane in an axial flow fluidic machine from a leading edge part and a trailing edge part connected with a pin to the leading edge part, moving said trailing edge part through thermal deformation of a thermally deforming metallic plate and changing an outflow angle of the guide vane. CONSTITUTION:A variable inlet guide vane is divided into a leading edge part 5 fixed to a wall surface of a casing 1 and trailing edge part 6 behind the part 5, and the both parts 5, 6 are turnably combined by connecting supporting parts 7, 8 provided internally of said parts 7, 8 with a single of pin 9. While a thermally deforming metallic plate 10 like a bimetal or shape memory alloy is secured to one end of both vane surface parts to smooth the vane surface, while a flexible plate material 11 of rubber plate or the like combines the both vane surfaces in the other end of the vane surface, further a heating wire 12 is provided neighboring to said plate 10. In this way, the plate 10 is extended and contracted by adjusting a heat quantity of the wire 12, and an outflow angle of the inlet guide vane can be changed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an axial flow type fluid machine, and particularly to a variable population guide vane suitable for improving performance when a circumferentially non-uniform flow 2L flows into the machine.

When operating an axial flow type fluid machine under partial load, the rotational speed and flow rate change. As a result, the inflow angle to the rotor blade changes, deviates from the optimum inflow state, and performance deteriorates. One method for improving performance under such partial loads is the method of variable population guide vanes. This is intended to improve performance by changing the mounting angle of the inlet guide vane during partial load, optimizing the inflow angle to the rotor blade following this. FIG. 1 shows a conventional entrance guiding device. In the conventional variable inlet guide device, a ring 2 is fitted around a casing 1 and two link mechanisms 3, 3' are connected to a wing support shaft 4. When the separately installed sliding device is used to move the ring 2 in the entire circumferential direction, the second
As shown in the figure, the installation angle of the inlet guide vane can be changed by using the link mechanism. In this method, all the inlet guide vanes in the - row are connected to one ring, so the palanquin attachment angle is the same in the circumferential direction, and therefore the outflow angle from the inlet guide vanes is also constant in the circumferential direction. However, in actual compressors, the flow flowing into the compressor is often not uniform in the circumferential direction due to the axial valve symmetry of the upstream casing. In such a case, in the conventional variable population guide blade, the relative inflow angle to the rotor blade becomes non-uniform in the circumferential direction. In other words, with conventional variable population guide blades, the optimum inflow angle is achieved in a part of the circumferential direction, but
In other parts, the inflow angle to the rotor blade is too large or too small.
For this reason, there was a drawback that the performance of the compressor deteriorated.

The present invention has been achieved based on the above-mentioned matters, and even when the flow at the inlet of the rotor blades is non-uniform in the circumferential direction, all the rotor blades maintain the optimum inflow state, thereby improving the efficiency of the axial flow type fluid machine. The purpose is to achieve full optimization.

Figure 3 shows the velocity triangle at the rotor blade inlet in the case of a conventional υ variable population guide blade. In the figure, when the axial velocity C1, the rotational peripheral speed of the rotor blade '1, and the angle βB of the rotor blade are given, the optimum inflow angle α1 to the rotor blade takes a value as shown by the solid line. Therefore, if the outflow angle of the inlet guide vane is set to tα1, the inflow state of the rotor blade will be optimal. However, if there is a part in the circumferential direction where the axial flow velocity is low (iG), the velocity triangle as shown by the dotted line in the figure will result, and in this part the flow into the rotor blade will be far from the optimum state, causing compression. This may cause a decrease in machine efficiency. This is because in conventional variable population guide vanes, the outflow angle is constant in the circumferential direction. If the axial velocity changes greatly in the circumferential direction, the outflow angle of the inlet/inner blade will be adjusted accordingly, and the flow condition to the wing will be good at all positions in the circumferential direction. ,
Compressor efficiency is improved. In the present invention, the inlet guide vane is divided into a leading edge portion identified to the casing and a trailing edge portion bonded to the leading edge portion, and both are connected by a heat-deformable metal plate.
By expanding and contracting the heat-generating cedar metal plate using the heating wire provided inside, it is possible to independently change the outflow angle of each inlet guide vane in the local direction. FIG. 4 shows the velocity triangle upstream of the inlet guide vane of the present invention. Even in a portion where the axial flow velocity is low as shown by the dotted line, if the inlet guide vane exit angle is set accordingly, the inflow state of the rotor blade will be normal even in this portion, and the efficiency of the compressor will be improved. Conversely, even in areas where the axial velocity is excessive,
It is obvious that similar effects can be obtained.

Hereinafter, one embodiment of the present invention will be described in more detail with reference to FIGS. 5 to 7. In the present invention, entrance guide Jkk,
As shown in FIGS. 5 and 6, the casing 1 is divided into a front edge 5 fixed to the wall surface and a rear edge 6 connected to the front edge with a pin. Support parts 7.8 are provided on the inside of both wing parts, and both wing parts are connected to the bottle 9, and a rear line part 6 is provided around the fulcrum.
is rotatable. In addition, a heat deformable metal plate 10i such as bimetal or shape memory alloy is fixed to one end of the blade surface of both wing parts, and the joint part of the blade surface is formed into a smooth surface, and the blade surface of the other end is The two wing parts are connected by a flexible plate 11 such as a rubber plate. Further, a heating wire 12 is provided adjacent to the heat deformable metal plate. In the above configuration, the heat tti adjustment of the heating wire is caused by the expansion and contraction of the heat deformable metal plate.
Accordingly, the outflow angle of the inlet guide vane can be changed. In conventional variable population guide vanes, the outflow angle of all the blades is the same, but in the present invention, the amount of heat of the heating lid of each blade can be changed by changing the outflow angle of the inlet guide vane.

Therefore, even when there is a large circumferential change in inflow velocity, the inflow state to all rotor blades in the circumferential direction can be optimized.

In this case, it is necessary to know the value of the axial velocity at each circumferential position. Therefore, in the present invention, the total pressure and the static pressure chamber are determined from the total pressure hole 13 provided at the leading edge of the inlet guide vane and the wall pressure hole 14 provided at the casing wall upstream of the inlet guide vane, and the total pressure is determined from the inlet guide vane. The height of the airflow is measured using the width gauge 15 installed upstream, and the axial flow velocity at the inlet of the rotor blade is determined using the following formula.

Here, C: Axial flow velocity at industrial inlet P: Total pressure measured at the leading edge of the inlet guide p: Wall pressure measured upstream of the inlet guide vane T: Width R measured upstream of the inlet guide vane Gas constant g of two gases : The pressure from the gravity acceleration total pressure hole 13 is
7 to a pressure transducer 18, as shown in FIG. Further, a measurement signal from a rotation speed detector 19 provided at one end of the shaft is guided to an arithmetic unit 20 together with the measurement values of the pressure transducer 18 and the knitting cutter 15. In the arithmetic unit, 2fi+
Due to the axial flow rate #C.

At the same time, the rotor blade circumferential speed is calculated based on the rotational speed information, the velocity triangle at the rotor blade inlet is determined, and the optimal outflow angle is calculated. Furthermore, based on this calculation result, what is the trailing edge rotation angle of each inlet guide blade and the voltage value of the heating element required to achieve this angle? f- rise and put this signal into the transformer 21,
The outflow angle of each inlet guide vane can be varied.

As explained above, according to the present invention, it is possible to
= It is divided into a part # fixed to the casing wall and a heat exchanger part connected to the front edge by a bottle, and further a heat deformable metal plate is provided on the R surface, and in instant contact with this, the entire heating element vl, The heat deformable metal plate is expanded and moved by the heating of the heating element, so that the sound quality of the outflow angle of the inlet guide vane can be changed. In addition, there is a total pressure hole on the leading edge of the inlet guide vane, a wall pressure hole and width gauge on the casing, a full rotation speed detector on the shaft end, a pressure transducer, a calculation device, a transformer, and an optimal outflow for each member. I made it possible to achieve the angle, so
@ Even when the axial flow velocity at the blade inlet is non-uniform, all Tm trues can be maintained in the optimum inflow state, and the efficiency of the axial flow type fluid machine can be optimized.

[Brief explanation of drawings]

Figure 1 shows the structure of a conventional variable population guide wing.
Figures 2 and 2 are the 11th and 31st convicts, respectively.
An explanatory diagram of the velocity triangle at the lil+ blade inlet, FIGS. 5 to 7 show explanatory diagrams of the variable population guide vane of the present invention. 1...Casing, 5...Front edge, 6...+lj
Line part, 10... Heat deformable metal plate, 11...'o] Flexible root plate piece 2... Heating element, 13... Full pressure hole, 14...
... Wall pressure hole, 15 ... Width meter, 18 ... Pressure gauge, 19 ... Rotation speed detector, 20 ... Arithmetic device, 21
···Trance. χ 1 Ward ↓ Figure 2 Figure 3 %4 Ward y 5 Figure 4 Port'fJ 7

Claims (1)

[Claims] 1. An axial-flow rotating machine comprising an inlet guide vane installed in an annular flow path formed by a casing, and a rotary shaft that rotates with moving blades arranged behind the inlet guide vane. , the inlet guide vane is divided into a leading edge fixed to the casing wall and a trailing edge pin-coupled to the leading edge, and the uniform surface is formed by a heat-deformable gold maple plate and a readable plate piece. A heating wire is provided in the inner space of the heat-deformable gold ingot plate, and the heat-deformable metal plate is expanded and contracted by heating of the heat-generating wire, thereby changing the outflow angle of the inlet guide vane. Variable population guide wing. 2. A total pressure measuring hole provided on the leading edge of the inlet guide vane, a wall pressure hole provided in the wall of the casing upstream of the inlet guide vane, and a pressure transducer and inlet guide that convert the pressure from both pressure holes into an electric signal. an altimeter that measures the airflow width upstream of the blade, a rotation speed detector that measures the shaft rotation speed, and a calculation device that calculates the optimum inflow angle 1r to the rotor blade from the signals from the pressure transducer, thermometer, and rotation speed detector; The patented invention is characterized in that it includes a transformer that generates a voltage corresponding to the rotation angle of the trailing edge of the blade according to a signal from the arithmetic unit, and adjusts the heat amount of the heating wire according to the voltage from the transformer. The variable population guide wing described in paragraph 1.