JPH0874603A - Fluid extraction mechanism for compressor - Google Patents

Abstract

PURPOSE: To reduce pressure loss of fluid extracted from a portion on the way of a main flow passage of operation fluid of a compressor. CONSTITUTION: An extraction port is formed on the way of a main flow passage for operation fluid of a compressor, and serves to extract the operation fluid after passing a part of the plurality of blades for compressing the operation fluid. Flow passages 13, 14 are circularly formed around a rotary shaft of the compressor, for allowing the operation fluid extracted by the extraction port to flow. An operation fluid chamber 5 is circularly formed on an outer peripheral side of the flow passages, connected to a downstream side of the flow passages at its inflow side, and connected to at least one piping at its outflow side. In a fluid extraction mechanism for a compressor having the above- mentioned members, a flowing direction of the flow passage is gradually varied to a diameter direction from an axial direction of the rotary shaft of the compressor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor having a flow path for reducing the pressure loss of the extraction fluid extracted from the middle of the main flow path of the working fluid of the compressor or the discharge fluid discharged from the compressor. A fluid extraction mechanism.

[0002]

2. Description of the Related Art A working fluid compressed by a compressor is discharged from a discharge passage for final use.
In practice, a considerable amount is extracted along the flow path of the compressor. The reasons for this are roughly classified into two.

The first reason is that the compressor is operated in a safe state during starting, stopping, or partial load operation of the compressor. That is, at the time of partial load operation of the compressor, there is a great risk of causing an unsteady phenomenon such as a surge or a rotating stall, which is extremely dangerous for the compressor. In order to avoid this dangerous state, a method of blowing air to reduce the flow rate in the flow passage on the downstream side of the compressor may be used in addition to the method of varying the stationary blade mounting angle of the compressor. Because.

In this case, the air extracted from the middle of the flow path of the compressor is usually discarded, and
The operating condition in which the air is blown is often short.
The second reason is that the air extracted from the middle of the flow path of the compressor is positively used for another purpose.

The most extreme example in this case is that of a compressor for a gas turbine. In a gas turbine, the air compressed by the compressor is used for combustion as well as for cooling turbine blades operating in hot gas.

The air used for cooling the turbine blades can cool the turbine blades efficiently at a low temperature. Therefore, as long as the pressure is satisfied, high temperature compressor discharge air is used. Also, compressed air in the middle of the flow path of the compressor is preferable. For this reason,
The air extracted from the middle of the flow path of the compressor is often used for cooling the latter stage of the turbine where the pressure and temperature decrease.

For the above reasons, the compressor usually has a mechanism for extracting the working fluid from the middle of the flow path of the compressor. FIG. 7 shows a partial cross-sectional view of a conventional axial compressor for a gas turbine.

As shown in the figure, rotor blades 1 rotatably provided around the rotary shaft of the compressor are provided with rotor blades 2 substantially vertically in the radial direction. A vane 4 is attached to the casing 3 of the compressor substantially perpendicularly to the rotor 1.

Further, in the middle of the flow path of the working fluid of the compressor, three bleed ports (not shown) which are part of the mechanism for extracting the working fluid are provided. The bleed port of this compressor is normally led from a short flow path to the bleed chamber 5 formed in an annular shape with respect to the rotation axis of the rotor 1.

An extraction pipe is connected to the extraction chamber 5. The bleeding chamber 5 is configured to have a volume sufficient to decelerate the fluid and eliminate non-uniformity in the circumferential direction of the rotary shaft of the compressor. Further, the extraction chamber 5 is often made to have a double casing structure to increase its volume.

[0011]

When actually designing the extraction port, it is necessary to pay attention to the following points. One is to extract the fluid uniformly and stably in the circumferential direction of the rotary shaft of the compressor so as not to adversely affect the working fluid of the compressor.

In the past, it was reported that the extraction of the working fluid was non-uniform in the circumferential direction, resulting in a serious accident in which the blades of the compressor were scattered. In order to avoid such a phenomenon, it is necessary to carefully determine the shape of the bleeding port provided in the compressor passage, and the flow path shape leading to the pipe for guiding this to the outside of the compressor.

Another point is to reduce the pressure loss of the extraction fluid as much as possible. As described above, in the axial flow compressor of the gas turbine, the extracted fluid is guided to the turbine and used as cooling air. However, if the pressure loss during this period is large, the higher pressure air is required.

In other words, it is necessary to extract the working fluid from the downstream side of the flow path of the working fluid of the compressor, and at the same time, the temperature of the extracted fluid rises, and in order to obtain the same cooling effect, the compressor It requires a larger amount than using a cold extraction fluid upstream of the working fluid flow path.

Further, in order to obtain a higher temperature / high pressure extraction fluid from the downstream side of the flow path, it is obvious that a larger compressor power is required even if the same flow rate is extracted, Eventually, the efficiency of the gas turbine as a whole is reduced.

Generally, pressure loss is reduced at lower flow rates. Therefore, in order to solve the above problem, it is desirable to efficiently reduce the flow velocity of the extraction fluid and connect it to the pipe. However, in the flow path that is a decelerating flow, the development of the boundary layer is large and the flow is unstable, so careful design is necessary to obtain a stable flow without separation or bias while increasing the deceleration ratio. Becomes

The above-mentioned two points seem to be different problems at first glance, but in the end, it depends on how smoothly the fluid extracted from the mainstream of the compressor is decelerated and coupled to the pipe.
The reason for this is that if separation occurs in this part, there is a high risk of inducing an unsteady phenomenon and making the circumferential flow non-uniform, and reducing the effective flow path cross-sectional area resulting in insufficient deceleration and pressure loss. Is also increased.

Further, a problem in designing the extraction port and the extraction chamber 5 is that the flow inside the extraction port and the extraction chamber 5 is also a swirl flow because the main flow of the compressor is a swirl flow. .

In the structure of the bleeding mechanism of the compressor described above, the fluid extracted from the main flow flows into the bleeding chamber 5 through a relatively short flow path as shown in FIG. 8 and flows out of the pipe as it is. However, in such a structure, in the flow in the flow path up to the extraction chamber 5, as shown in FIG. 8, the flow of the fluid having the swirling component has the inclination α with respect to the rotation axis of the compressor. When flowing in the meridional section of the flow channel, the flow is biased in one direction due to the component of the centrifugal force due to the swirl in the flow channel width direction,
Sufficient deceleration, that is, static pressure recovery cannot be expected, and fluid pressure loss is large.

If an attempt is made to connect to a pipe with a strong swirling speed, the cross-sectional area of the flow path will rapidly expand at the inlet of the bleeding chamber 5, and the pressure loss at this portion will increase.
As a result, a non-uniform flow is induced in the circumferential direction of the rotary shaft of the compressor.

Further, since the sufficient deceleration is not performed, the working fluid in the extraction chamber 5 has a strong swirling component, and the flow of the fluid is likely to be unstable. As described above, there is a method of increasing the volume of the bleeding chamber 5 in order to solve such a problem. For example, a method of providing a swirl preventing rib in the bleeding chamber 5 as in JP-A-63-85299. Is also proposed.

However, such a method is not always sufficient in the sense of reducing the pressure loss, and the essential solution to the problem is to recover the static pressure as large as possible to the minimum pressure loss before reaching the extraction chamber 5. It was necessary to realize in.

The present invention has been made in view of the above circumstances, and even if a fluid having a swirling component flows in, the flow is not uniform in the circumferential direction and an unstable phenomenon is not induced.
An object of the present invention is to provide a fluid extraction mechanism of a compressor that can reduce pressure loss of extraction fluid by efficiently decelerating and performing static pressure recovery.

[0024]

Therefore, first, in order to achieve the above object, according to the invention of claim 1, it is provided in the middle of the main flow path of the working fluid of the compressor to compress the working fluid. An extraction port for extracting the working fluid after passing through a part of a plurality of blades, and a flow path formed in an annular shape around the rotation shaft of the compressor and flowing the working fluid extracted at the extraction port. A working fluid chamber formed in an annular shape on the outer peripheral side of the flow path, the inlet side being connected to the downstream side of the flow path, and the outlet side being connected to at least one pipe. In the fluid extraction mechanism, the flow passage direction of the flow passage is configured to gradually change from the substantially axial direction of the rotary shaft of the compressor to the radial direction.

According to the second aspect of the present invention, the working fluid is extracted after passing through a part of a plurality of blades provided on the main flow path of the working fluid of the compressor and compressing the working fluid. An extraction port, a flow passage formed in an annular shape around the rotary shaft of the compressor, through which the working fluid extracted in the extraction opening flows, and an inlet formed in an annular shape on the outer peripheral side of the flow passage. And a working fluid chamber having an outlet connected to at least one pipe, a fluid extraction mechanism of the compressor, wherein the direction of the flow path is the compressor. From the inclined flow passage portion that gradually changes from the substantially axial direction of the rotation shaft in the radial direction, and the radial flow passage portion that is provided on the downstream side of the inclined flow passage portion and extends in the radial direction of the rotation shaft of the compressor, It is characterized by being configured.

Further, according to the invention of claim 3, in the fluid extracting mechanism of the compressor according to claim 2, the compressor is attached at a height of 50% or less of the flow passage width of the inclined flow passage portion, It is characterized in that it is provided with guide vanes attached to a part or all of the wall surface of either the inner peripheral surface side or the outer peripheral surface side of the road.

Further, according to the invention of claim 4, the working fluid is extracted after passing through a part of a plurality of blades provided on the main flow path of the working fluid of the compressor and compressing the working fluid. An extraction port, a flow passage formed in an annular shape around the rotary shaft of the compressor, through which the working fluid extracted in the extraction opening flows, and an inlet formed in an annular shape on the outer peripheral side of the flow passage. A fluid extraction mechanism of a compressor, wherein a working fluid chamber is connected to a downstream side of the flow passage and an outlet side is connected to at least one pipe.
%, Or less, and provided with a guide vane attached to a part or all of the wall surface on either the inner peripheral surface side or the outer peripheral surface side of the flow path.

Further, according to the invention of claim 5, in the fluid extraction mechanism of the compressor according to claim 3 or 4, the shape of the guide vanes is at the blade row outlet of the blade before extraction. It is characterized in that it has an equiangular spiral shape that substantially matches a flow angle defined by a swirl component of the working fluid and a flow passage direction component of the extraction fluid.

Further, according to the invention of claim 6, in the fluid extraction mechanism of the compressor of claim 3 or 4, the shape of the guide vanes is circular.

Further, according to the invention of claim 7, in the fluid extraction mechanism of the compressor according to claim 3 or 4, the guide vanes are rectangular in shape.

[0031]

According to the first aspect of the present invention, the flow direction of the flow path for the extraction fluid is configured to gradually change from the substantially axial direction of the rotary shaft of the compressor to the radial direction. Is uniformed, and as a result, the static pressure recovery rate of the extracted fluid is increased, the pressure loss is also reduced, and it is possible to extract a higher pressure fluid.

According to the invention of claim 2, since the radial flow path portion extending in the radial direction of the rotary shaft of the compressor is provided on the downstream side of the inclined flow path portion, in addition to the invention of claim 1, Furthermore, the static pressure recovery rate can be increased, and the risk of affecting the main flow of the working fluid of the compressor can be prevented.

According to the third and fourth aspects of the present invention, the flow of the fluid can be corrected by mounting the guide vanes in the flow path of the extraction fluid at a height of 50% or less of the flow width. The extraction fluid can be efficiently decelerated to recover the static pressure of the extraction fluid, and as a result, the pressure loss can be reduced.

According to the invention of claim 5, in the invention according to any one of claims 2 to 4, since the guide vanes are formed into an equiangular spiral shape, the compressor of high fluid performance is provided. A fluid extraction mechanism can be provided.

According to the sixth and seventh aspects of the invention, in the invention according to any one of the second to fourth aspects, the guide vanes are formed in a circular shape or a rectangular shape, so that the production cost is reduced. A fluid extraction mechanism of the compressor can be provided.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A fluid extraction mechanism of a compressor according to an embodiment of the present invention will be described below with reference to the drawings. <First Embodiment> FIG. 1 shows a sectional view of an extraction mechanism of an axial flow compressor according to a first embodiment of the present invention, and FIG.
The sectional view on the AA line of the axial flow compressor extraction mechanism shown in FIG.
The same parts as those in FIG. 7 are designated by the same reference numerals, and the description thereof will be omitted. Here, only different parts will be described.

As shown in FIGS. 1 and 2, this bleeding mechanism is composed of an inclined flow passage portion 13, a radius flow passage portion 14, and an bleeding chamber (or scroll) 5. Specifically, this bleeding mechanism is formed by providing a groove in a joint portion of the front casing 11, the rear casing 12, the upper half casing 21, and the lower half casing 22. Further, as shown in FIG. 2, the bleeding mechanism is provided in axial symmetry with respect to the rotation axis of the rotor 1.

The inclined flow passage portion 13 is formed in a substantially ring shape with respect to the rotation axis of the rotor 1, and has a passage meridian of a bleed air 16 extracted from the main flow 15 of the working fluid flowing in the main flow passage of the compressor. The cross section is formed so as to gradually change from the rotational axis direction of the compressor in the radial direction.

That is, the inclined flow passage portion 13 is constructed so that its flow passage direction gradually changes from the substantially axial direction of the rotation axis of the rotor 1 to the radial direction. Further, on the downstream side of the inclined flow path portion 13, there is provided a substantially annular radial flow path portion 14 extending in the radial direction of the rotation axis of the rotor 1, and on the downstream side of the radial flow path portion 14. It is connected to the inlet side of the annular extraction chamber 5 formed on the outer peripheral side of the radial flow passage portion 14.

The bleeding chamber 5 is constructed with a sufficient volume to make the flow of the bleeding fluid that has flowed in uniform, and the outlet side of this bleeding chamber 5 extends in the radial direction of the rotating shaft of the rotor 1. One or a plurality of extraction pipes 23 are connected.

As described above, the volume of the extraction chamber 5 is determined by
One or a plurality of extraction pipes 23 are provided on the outlet side of the extraction chamber 5.
Since the flow of the extracted fluid in the extraction chamber 5 is not axisymmetric with respect to the rotation axis of the rotor 1, the flow of the extracted fluid in the extraction chamber 5 becomes the unsteady flow of the main flow 15. This may cause a serious accident. Since the extracted fluid flowing through the inclined flow path portion 13 and the radial flow path portion 14 has been sufficiently decelerated, the extraction chamber 5 does not require a large volume.

Next, the operation of the fluid extraction mechanism of the axial compressor according to the first embodiment of the present invention will be described. In the axial compressor, the wake of the stationary blade 4 is a swirl flow in order to give the moving blade 2 an appropriate relative inflow angle.

Therefore, in the inclined flow path portion 13 of the extraction mechanism,
As shown in FIG. 3, a bleed air flow (swirl flow) 16 having an angle α with respect to the rotation axis of the compressor is extracted. The extraction flow 16 is
Since the inclined passage portion 13 is formed so as to gradually change in the radial direction from the axial direction of the rotation axis of the rotor 1, the inclined passage portion 13 flows in the inclined passage portion 13 with the radius of curvature Rs in the meridional section.

Centrifugal force Cm .multidot.Cm due to this radius of curvature Rs
/ Rs (Cm: velocity in meridional direction) acts in a direction that cancels out centrifugal force (Cθ · Cθ / r) · cosα due to the turning velocity component, so that the distribution of meridional velocity Cm is also unbalanced, and as a result, The flow of the bleed air 16 is made uniform, the static pressure recovery rate of the bleed air 16 is increased, and the pressure loss is also reduced.

On the other hand, in the case where the inclined flow passage portion 13 is not provided as in the conventional case, as shown in FIG. 8, the centrifugal force (in the flow passage width direction) due to the swirl velocity component Cθ of the flow in the extraction flow passage ( C
Since θ · Cθ / r) · cos α acts, the meridional velocity Cm is largely deviated, and the flow becomes unstable, and
The effective flow path cross-sectional area decreases, static pressure recovery is not sufficiently performed, and the pressure loss of the bleed air also increases.

However, the above is a one-dimensional consideration, and in reality, the radius of curvature Rs takes into consideration the flow velocity and the enthalpy distribution of the flow flowing into the inclined flow passage portion 13, and the change rate of the flow passage area. The meridional cross-section flow path shape of the inclined flow path portion 13 should be determined so as to be optimal.

Further, since the flow at the outlet of the inclined flow passage portion 13, that is, the flow of the fluid flowing into the radial flow passage portion 14 is corrected to be a uniform flow, the radial flow passage portion 14 is provided.
Since the centrifugal force due to the swirling of the bleed airflow does not have a component in the flow passage width direction and the radius of curvature Rs is infinite, a force in the flow passage width direction does not act on the bleed air flow and there is no uneven flow. Is maintained, and the static pressure recovery is further performed in the radial passage portion 14.

The extracted fluid that has passed through the inclined flow path section 13 and the radial flow path section 14 flows into the extraction chamber 5 after being sufficiently decelerated. Since one or a plurality of extraction pipes 23 are connected to the extraction chamber 5, the flow of the extraction fluid in the extraction chamber 5 is not necessarily axially symmetric with respect to the rotation axis of the rotor 1,
The extraction chamber 5 is configured with a sufficient volume, and the extraction fluid is sufficiently decelerated, so that the flow of the extraction fluid in the extraction chamber 5 is made uniform.

The radial passage portion 14 in the above description
Need not necessarily be formed of parallel walls, and may be configured such that the flow channel width is gradually reduced or gradually increased in order to adjust the area change rate to enable stable deceleration.

Further, the flow passage cross-sectional areas of the inclined flow passage portion 13 and the radial flow passage portion 14 may be made larger than those of the conventional one. As described above in detail, according to the extraction mechanism of the axial compressor according to the first embodiment of the present invention, the flow of the extraction fluid is corrected in the flow path to reach the extraction chamber 5. It enables sufficient static pressure recovery with very little pressure loss,
As a result, it is possible to extract a higher-pressure fluid even from the middle of the same main flow path.

Further, since the flow velocity of the extraction fluid is sufficiently reduced before flowing into the extraction chamber 5 and the extraction pipe 23, an uneven flow in the circumferential direction due to extraction is unlikely to occur, which adversely affects the main flow of the compressor. The danger of giving <Second Embodiment> Next, a fluid extraction mechanism of an axial compressor according to a second embodiment of the present invention will be described.

The fluid extraction mechanism of the compressor according to the first embodiment described above can be expected to have a sufficient effect, but the work for optimizing the flow path shape is complicated and the extraction flow path is complicated. Depending on the inflow conditions and structural restrictions, it may not always be possible to obtain a satisfactory shape.

The above-mentioned deviation of the flow of the bleeding fluid is related to whether or not the three-dimensional twist boundary layer develops evenly on both wall surfaces. In the second embodiment of the present invention, by providing a short guide vane on the wall surface where the remarkable twist boundary layer is expected to develop, the twist boundary layer is suppressed from developing and the flow of the extracted fluid is improved. Think to do.

FIG. 4 is a sectional view of the bleeding mechanism of the axial flow compressor according to the second embodiment of the present invention, and FIG. 5 is a BB of the bleeding mechanism of the compressor according to the second embodiment. A sectional view is shown.
The same parts as those in FIGS. 1 and 2 are designated by the same reference numerals, and the description thereof will be omitted. Here, only different parts will be described.

As shown in FIGS. 4 and 5, the second aspect of the present invention is as follows.
In the bleeding mechanism of the axial compressor according to the embodiment, the guide vanes 31 are arranged at regular intervals on the wall surface of the inclined flow path portion 13 where the twist boundary layer is expected to develop significantly.

The guide vanes 31 are used for the purpose of controlling the boundary layer of one of the boundary faces of the inclined flow passage portion 13, and therefore short guide vanes having a flow passage width of 50% or less are used. If the channel width is 50
This is because, when the guide vanes having a height of not less than% are attached, the profile loss rather increases, and further, there is a high possibility that the performance will be extremely deteriorated with respect to extraction conditions other than the design point.

The shape of the guide vanes 31 is determined not only in terms of fluid performance but also in consideration of production costs. Especially when high fluid performance is required, tan-1
It is defined by the flow angle determined by (Cm / Cθ), that is, the swirl component of the working fluid at the blade row exit of the stationary blade 4 or the moving blade 2 before extraction, and the flow passage direction component of the extraction fluid at the flow passage inlet. If the production cost is important, a guide vane with a rectangular shape (straight line) will be used.

Further, a circular guide vane which is an intermediate shape between these may be adopted. The position where the guide vanes 31 are attached is not necessarily limited to the position shown in FIG.

For example, when the radius of curvature Rs of the streamline in the inclined flow passage portion 13 is small, the flow is likely to be separated at the side wall surface of the front casing 11 near the entrance of the radial flow passage portion 14, Guide wings 31 are installed in this portion.

Therefore, as in the case of the above-described first embodiment, the relatively short guide vane 31 is attached to the wall surface of the flow path where the development of the twist boundary layer is expected, so that the flow of the fluid can be improved. Can be corrected.

By installing the guide vanes 31, the conditions of the extraction fluid flowing into the extraction passage due to changes in operating conditions,
In particular, there is a risk that the incident angle with respect to the guide vane 31 will change and the fluid flow will separate under operating conditions other than the design condition of the guide vane 31 to induce an unstable flow.
By setting the height of 1 to 50% or less of the flow channel width, it is possible to avoid this danger while sufficiently maintaining the original effect of suppressing the twist boundary layer.

Further, by mounting the guide vanes 31, the extracted fluid can be efficiently decelerated to recover the static pressure without inducing an unstable phenomenon, and as a result, the pressure loss can be reduced. it can. <Third Embodiment> The method of attaching the guide vanes described in the above second embodiment is used in the extraction passage constituted by the inclined passage portion 13 and the radial passage portion 14, and the effect thereof is obtained. Is more remarkable, the flow of the fluid can be sufficiently improved by using it alone in the normal extraction passage.

FIG. 6 shows a sectional view of the extraction mechanism of the axial compressor according to the third embodiment of the present invention. As shown in the figure,
In the extraction mechanism of the axial compressor according to the third embodiment of the present invention, the guide vanes 31 are installed in the extraction passage having the linear wall surface shape in the meridional section.

Specifically, this guide vane 31 is installed at a position where the development of the twist boundary layer on the side wall surface of the rear casing 12 is remarkable. Similar to the second embodiment, it is possible to improve the flow of the extraction passage and realize sufficient static pressure recovery of the fluid in the extraction passage.

Further, in the present embodiment, the shape of the flow path is simpler and the guide vanes 3 are different from the first and second embodiments described above.
Since the No. 1 is easily attached, the same effect can be obtained at a low manufacturing cost.

[0066]

According to the invention of claim 1, since the flow passage direction of the flow passage for the extraction fluid is configured to gradually change from the substantially axial direction of the rotary shaft of the compressor to the radial direction, The flow is made uniform, and as a result, the static pressure recovery rate of the extraction fluid is increased, the pressure loss is also reduced, and it is possible to extract a higher pressure fluid.

According to the invention of claim 2, since the radial flow path portion extending in the radial direction of the rotary shaft of the compressor is provided on the downstream side of the inclined flow path portion, in addition to the invention of claim 1, The static pressure recovery rate can be increased, and the risk of affecting the main flow of the working fluid of the compressor can be prevented.

According to the third and fourth aspects of the present invention, the flow of the fluid can be corrected by mounting the guide vanes in the flow passage of the extraction fluid at a height of 50% or less of the flow passage width.
The extracted fluid can be efficiently decelerated to recover the static pressure of the extracted fluid, and as a result, the pressure loss can be reduced.

According to the invention of claim 5, in the invention according to any one of claims 2 to 4, since the guide vanes are formed into an equiangular spiral shape, the fluid of the compressor having high fluid performance is obtained. An extraction mechanism can be provided.

According to the sixth and seventh aspects of the invention, in the invention according to any one of the second to fourth aspects, the guide vanes are formed in a circular shape or a rectangular shape, so that the production cost is reduced. A fluid extraction mechanism for the compressor can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view of an extraction mechanism of an axial flow compressor according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of the extraction mechanism of the axial flow compressor according to the first embodiment.

FIG. 3 is a diagram showing a fluid flow in an inclined flow path portion 13 of the axial compressor according to the first embodiment.

FIG. 4 is a sectional view of an extraction mechanism of an axial flow compressor according to a second embodiment of the present invention.

FIG. 5 is a BB cross-sectional view of the extraction mechanism of the axial compressor according to the second embodiment.

FIG. 6 is a sectional view of an extraction mechanism of an axial flow compressor according to a third embodiment of the present invention.

FIG. 7 is a diagram showing a partial cross-sectional view of a conventional typical gas turbine axial flow compressor.

FIG. 8 is a diagram for explaining a flow in a conventional extraction passage.

[Explanation of symbols]

1 ... Rotor, 2 ... Moving blade, 3 ... Casing, 4 ... Stationary blade, 5
... bleeding chamber, 11 ... front casing, 12 ... rear casing, 13 ... inclined flow passage part, 14 ... radial flow passage part, 15 ... main stream, 16 ... bleed air flow, 21 ... upper half casing, 22 ... lower half casing, 23 … Bleed pipes, 31… guide wings.

Claims (7)

[Claims] 1. An extraction port provided in the main flow path of a working fluid of a compressor, for extracting the working fluid after passing through a part of a plurality of blades for compressing the working fluid, and rotation of the compressor. A flow path that is formed in an annular shape around the shaft and through which the working fluid extracted at the extraction port flows, and is formed in an annular shape on the outer peripheral side of the flow path, and the inlet side is connected to the downstream side of the flow path. A working fluid chamber whose outlet side is connected to at least one pipe; and a fluid extraction mechanism of a compressor, wherein a flow direction of the flow path is gradually changed from a substantially axial direction of a rotation shaft of the compressor. A fluid extraction mechanism of a compressor, which is configured to change in a radial direction. 2. An extraction port provided in the main flow path of the working fluid of the compressor, for extracting the working fluid after passing through a part of a plurality of blades for compressing the working fluid, and rotation of the compressor. A flow path that is formed in an annular shape around the shaft and through which the working fluid extracted at the extraction port flows, and is formed in an annular shape on the outer peripheral side of the flow path, and the inlet side is connected to the downstream side of the flow path. A working fluid chamber whose outlet side is connected to at least one pipe; and a fluid extraction mechanism of a compressor comprising: Direction of the inclined flow path portion, and a radial flow path portion that is provided on the downstream side of the inclined flow path portion and extends in the radial direction of the rotation axis of the compressor. Fluid extraction mechanism. 3. The height of the inclined flow passage portion is 50% or less of the flow passage width, and is attached to a part or all of the wall surface of either the inner peripheral surface side or the outer peripheral surface side of the flow passage. The fluid extraction mechanism of the compressor according to claim 2, further comprising: a guide vane. 4. An extraction port provided on the main flow path of the working fluid of the compressor, for extracting the working fluid after passing through a part of a plurality of blades for compressing the working fluid, and rotation of the compressor. A flow path that is formed in an annular shape around the shaft and through which the working fluid extracted at the extraction port flows, and is formed in an annular shape on the outer peripheral side of the flow path, and the inlet side is connected to the downstream side of the flow path. A fluid extraction mechanism of a compressor comprising: a working fluid chamber whose outlet side is connected to at least one pipe;
A fluid extraction mechanism for a compressor, comprising guide vanes mounted on a part or all of a wall surface on either the inner peripheral surface side or the outer peripheral surface side of the flow path. 5. The shape of the guide vanes is substantially the same as the flow angle defined by the swirling component of the working fluid at the blade row outlet of the blade before extraction and the flow passage direction component of the flow passage inlet of the extraction fluid. The fluid extraction mechanism of the compressor according to claim 3 or 4, wherein the fluid extraction mechanism has a conformal spiral shape. 6. The fluid extraction mechanism of the compressor according to claim 3, wherein the guide vane has a circular shape. 7. The fluid extraction mechanism for a compressor according to claim 3, wherein the guide vane has a rectangular shape.