JP5453176B2 - Axial flow compressor - Google Patents

Description

  The present invention relates to an axial flow compressor.

  2. Description of the Related Art In a compressor, an outlet casing through which compressed air flows is formed in a shape that gradually increases in accordance with the merged compressed air (see Patent Document 1). Such a compressor can smooth the flow of compressed air and suppress pressure loss.

Japanese Utility Model Publication No. 3-123906

  On the other hand, in the axial flow compressor, the shape of the outlet casing through which the compressed air flows is generally designed to have a constant size. Such an axial flow compressor is described in Patent Document 1. If this technique is to be applied, the outlet casing must be replaced. Replacing the outlet casing in an axial compressor, which is generally large in size, is costly to design and manufacture a new outlet casing, and is difficult to replace. There is a problem that the casing becomes waste.

  The present invention has been developed to solve the above-described problems, and an object of the present invention is to provide an axial compressor that can suppress pressure loss at low cost.

  In order to solve the above problems, an axial flow compressor according to the present invention includes an inlet casing into which a fluid flows, a fluid compressing unit that compresses the fluid sent from the inlet casing, and the compressor that is compressed by the fluid compressing unit. A diffuser through which a fluid flows, a hollow annular shape, an outlet casing through which the fluid sent from the diffuser flows, and a fluid connected to the outlet casing and sent from the outlet casing to the outlet casing. A compressed fluid discharge pipe that discharges radially outward, and the fluid compression portion includes a central casing having a stationary blade standing on an inner surface, and a motion provided on the outer surface and provided in the central casing. A rotor having blades, wherein the diffuser is disposed at a front end of the outlet casing opposite to the rotor. The fluid is shaped to flow outward in the radial direction of the outlet casing, and the rotor in the outlet casing from the upstream side in the rotational direction of the rotor at a portion where the outlet casing and the compressed fluid discharge pipe are connected. An annular horn-like member having a cross-sectional area that decreases in the rotation direction is provided.

  According to this configuration, by providing the horn-shaped member in the exit casing of the existing axial flow compressor, the flow of the compressed air can be made smooth, and the pressure loss can be suppressed at a low cost.

  The axial flow compressor is configured to block the fluid from flowing in the circumferential direction of the outlet casing on the upstream side in the rotational direction of the rotor at a portion where the outlet casing and the compressed fluid discharge pipe are connected. The structure further provided with the partition member which block | closes between a horn-shaped member and the said exit casing may be sufficient.

  Further, the horn-shaped member is configured to block the fluid from flowing in the circumferential direction of the outlet casing on the upstream side in the rotation direction of the rotor at a portion where the outlet casing and the compressed fluid discharge pipe are connected. The structure which exhibits the shape which plugs up the said outlet casing may be sufficient.

  In order to solve the above problems, an axial flow compressor according to the present invention is compressed by an inlet casing into which a fluid flows, a fluid compression unit that compresses the fluid sent from the inlet casing, and the fluid compression unit. A diffuser through which the fluid flows, a hollow annular shape, an outlet casing through which the fluid sent from the diffuser circulates, and the fluid sent from the outlet casing connected to the outlet casing. A compressed fluid discharge pipe that discharges radially outward of the casing, and the fluid compression portion is provided in the central casing having a stationary blade standing on the inner surface, and is provided on the outer surface. A rotor having a moving blade, wherein the diffuser is disposed at an end of the outlet casing opposite to the rotor. The fluid exhibits a shape that flows radially outward of the outlet casing, and in the outlet casing, on the upstream side in the rotational direction of the rotor at a portion where the outlet casing and the compressed fluid discharge pipe are connected, A partition member for closing the outlet casing is provided so as to block fluid from flowing in a circumferential direction of the outlet casing.

  According to such a configuration, by providing the partition member in the outlet casing of the existing axial flow compressor, the flow of the compressed air can be made smooth, and the pressure loss can be suppressed at a low cost.

  According to the present invention, pressure loss can be suppressed at low cost by utilizing an existing axial flow compressor.

It is sectional drawing which shows typically the axial flow compressor which concerns on 1st embodiment of this invention. It is a figure for demonstrating the horn-shaped member and partition member which were provided in the exit casing of the axial flow compressor which concerns on 1st embodiment of this invention which concerns on 1st embodiment of this invention, (a) Is a partially broken perspective view, and (b) is a cross-sectional view seen from the X1 direction of FIG. (A)-(c) is a figure for demonstrating the cross-sectional shape in the exit casing which concerns on 1st embodiment of this invention, (a) is sectional drawing seen from the X2 direction of FIG. b) is a cross-sectional view seen from the X3 direction of FIG. 2, and (c) is a cross-sectional view seen from the X4 direction of FIG. (D) is a figure for demonstrating the cross-sectional shape in the outlet casing which concerns on a comparative example. It is a figure for demonstrating the flow of the compressed fluid in the exit casing of the axial flow compressor which concerns on 1st embodiment of this invention, and is sectional drawing seen from the X1 direction of FIG. It is a figure for demonstrating the partition member provided in the exit casing of the axial flow compressor which concerns on 2nd embodiment of this invention, (a) is a perspective view which shows a partition member, (b) is FIG. It is sectional drawing seen from X1 direction. It is a figure for demonstrating the flow of the compressed fluid in the exit casing of the axial flow compressor which concerns on 2nd embodiment of this invention, and is sectional drawing seen from the X1 direction of FIG. It is a figure for demonstrating the horn-shaped member provided in the exit casing of the axial flow compressor which concerns on 3rd embodiment of this invention, and is sectional drawing seen from the X1 direction of FIG. It is a figure for demonstrating the fixing method of the horn-shaped member which concerns on 1st embodiment of this invention, and is sectional drawing seen from the X2 direction of FIG. It is a figure for demonstrating the modification of the partition member which concerns on 2nd embodiment of this invention, and is sectional drawing seen from the X1 direction of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate. Similar parts are denoted by the same reference numerals, and redundant description is omitted.

<First embodiment>
First, an axial flow compressor according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is a cross-sectional view schematically showing an axial compressor according to the first embodiment of the present invention. FIG. 2 is a view for explaining a horn-like member and a partition member provided in the outlet casing of the axial compressor according to the first embodiment of the present invention, and (a) is a partially broken perspective view. (B) is sectional drawing seen from the X1 direction of FIG. 3A to 3C are views for explaining a cross-sectional shape in the outlet casing according to the first embodiment of the present invention, and FIG. 3A is a cross-sectional view seen from the X2 direction of FIG. (B) is sectional drawing seen from the X3 direction of FIG. 2, (c) is sectional drawing seen from the X4 direction of FIG. FIG.3 (d) is a figure for demonstrating the cross-sectional shape in the exit casing which concerns on a comparative example. FIG. 4 is a view for explaining the flow of the compressed fluid in the outlet casing of the axial compressor according to the first embodiment of the present invention, and is a cross-sectional view seen from the X1 direction of FIG. 2 and 4, the diffuser 30 is omitted.

≪Basic configuration of axial compressor 1A≫
As shown in FIG. 1, the axial flow compressor 1A according to the first embodiment of the present invention includes an inlet casing 10, a fluid compression unit 20, a diffuser 30, an outlet casing 40, and a compressed fluid discharge pipe 50. .

  The inlet casing 10 is a hollow member into which a fluid to be compressed flows, and is also called an inlet scroll. The fluid flowing through the inlet casing 10 is sent to the fluid compression unit 20.

  The fluid compressing unit 20 compresses the fluid sent from the inlet casing 10 to generate a compressed fluid. The generated compressed fluid is sent to the diffuser 30. More specifically, the fluid compression unit 20 includes a central casing 21 and a rotor 22.

  The central casing 21 has a hollow cylindrical shape, and a plurality of stationary blades 21a are erected on the inner surface thereof. The upstream end of the central casing 21 is connected to the inlet casing 10, and the downstream end of the central casing 21 is connected to the outlet casing 40 via the diffuser 30.

  The rotor 22 is provided in the central casing 21 and has a cylindrical shape. A plurality of rotor blades 22a are erected on the outer surface. The plurality of moving blades 22a and the plurality of stationary blades 21a are alternately provided so as to face each other, and the fluid sent from the inlet casing 10 flows between the stationary blades 21a and the moving blades 22a. To do. The rotor 22 is driven to rotate by control of a control device (not shown). When the rotor 22 having the moving blade 22a rotates, the fluid flowing between the stationary blade 21a and the moving blade 22a is compressed, and a compressed fluid is generated. The degree of compression of the compressed fluid is controlled by the control device driving and controlling a stationary blade variable mechanism (not shown) to displace the stationary blade 21a. The generated compressed fluid is sent to the diffuser 30.

  The diffuser 30 is a member through which the generated compressed fluid flows. The diffuser 30 is provided on the radially inner side of the outlet casing 40, and exhibits a shape in which the compressed fluid flows toward the radially outer side of the outlet casing 40 at the end opposite to the rotor 22 in the outlet casing 40. . That is, the diffuser 30 is a member exhibiting a tapered shape whose diameter increases from the upstream side toward the downstream side. The compressed fluid that has flowed through the diffuser 30 is sent to the outlet casing 40.

  The outlet casing 40 has a hollow annular shape, and is a member through which the compressed fluid sent from the diffuser 30 circulates, and is also called an outlet scroll. The compressed fluid that has flowed through the outlet casing 40 is sent to the compressed fluid discharge pipe 50.

  The compressed fluid discharge pipe 50 is a pipe having a cylindrical shape, and is a pipe that is connected to the outlet casing 40 and discharges the compressed fluid sent from the outlet casing 40 to the radially outer side of the outlet casing 40. In the present embodiment, the compressed fluid discharge pipe 50 is connected to the lower end portion of the outlet casing 40 and discharges the compressed fluid sent from the outlet casing 40 downward.

<< Horn-shaped member 60A and partition member 70 >>
As shown in FIGS. 1 and 2, the axial compressor 1 </ b> A according to the first embodiment of the present invention further includes a horn-shaped member 60 </ b> A and a partition member 70.

  The horn-shaped member 60A is disposed near the outlet of the diffuser 30 in the outlet casing 40, and the outlet casing 40 and the compressed fluid discharge pipe 50 are connected as shown in FIGS. 3 (a) to 3 (c). This is an annular member whose cross-sectional area decreases from the upstream side in the rotational direction R of the rotor 22 at the part to the rotational direction R of the rotor 22. For example, the horn-shaped member 60 </ b> A is placed on the partition member 70 and is fixed to the diffuser 30 with a bolt.

  The partition member 70 has a horn so as to block the compressed fluid from flowing in the circumferential direction of the outlet casing 40 on the upstream side in the rotational direction R of the rotor 22 at a portion where the outlet casing 40 and the compressed fluid discharge pipe 50 are connected. It is a plate-like member that closes the space between the member 60 </ b> A and the outlet casing 40. The partition member 70 is fixed to the outlet casing 40 by welding, for example.

  When the horn-like member 60A is not provided, as shown in FIG. 3D, the compressed air sent from the diffuser 30 to the outlet casing 40 (arrow in FIG. 3D) is diffused. In the vicinity of the 30 outlets (the shaded portion in FIG. 3D), a vortex is generated and pressure loss occurs. On the other hand, since the axial flow compressor 1A according to the first embodiment of the present invention includes the horn-shaped member 60A, it is possible to prevent generation of vortex near the outlet of the diffuser 30 and suppress pressure loss. .

  The dotted line in FIG. 4 is the flow of the compressed fluid in the outlet casing 40 of the axial flow compressor 1A according to the first embodiment of the present invention. The axial flow compressor 1 </ b> A according to the first embodiment of the present invention includes a horn-shaped member 60 </ b> A, and the flow path shape of the compressed fluid in the outlet casing 40 is a cross-sectional area as it advances in the rotation direction R of the rotor 22. Is configured to be large. That is, in the axial flow compressor 1A according to the first embodiment of the present invention, the flow path shape of the compressed air becomes larger in accordance with the amount of compressed air that merges as it advances in the rotation direction R of the rotor 22. Therefore, the flow of compressed air can be made smooth and pressure loss can be suppressed.

  Further, since the axial flow compressor 1A according to the first embodiment of the present invention includes the partition member 70, the compressed air is prevented from flowing into the compressed air discharge pipe 50 from both the left and right sides in FIG. Can be suppressed.

  In addition, the axial flow compressor 1A according to the first embodiment of the present invention can be realized by providing the horn-like member 60A and the partition member 70 in the outlet casing 40 of the existing axial flow compressor. Pressure loss can be suppressed at cost.

<Second Embodiment>
Next, the axial flow compressor according to the second embodiment of the present invention will be described with reference to FIGS. 5 and 6 focusing on differences from the axial flow compressor 1A according to the first embodiment. FIG. 5 is a view for explaining a partition member provided in the outlet casing of the axial compressor according to the second embodiment of the present invention, (a) is a perspective view showing the partition member, (b) ) Is a cross-sectional view seen from the X1 direction of FIG. FIG. 6 is a view for explaining the flow of the compressed fluid in the outlet casing of the axial compressor according to the second embodiment of the present invention, and is a cross-sectional view seen from the X1 direction of FIG. In FIG. 5B and FIG. 6, the diffuser 30 is omitted.

  As shown in FIG. 5, the axial flow compressor 1 </ b> B according to the second embodiment of the present invention includes a partition member 80 instead of the horn-shaped member 60 </ b> A and the partition member 70. The partition member 80 is provided in the outlet casing 40, and the compressed fluid flows in the circumferential direction of the outlet casing 40 on the upstream side in the rotation direction of the rotor 22 at a portion where the outlet casing 40 and the compressed fluid discharge pipe 50 are connected. It is a member that closes the outlet casing 40 so as to block the flow. The partition member 80 is fixed to the outlet casing 40 by welding, for example.

  The partition member 80 has a tapered shape that expands from the radially inner side to the radially outer side in the axial view of the rotor 22. The radially inner end 81 of the partition member 80 abuts the lower end of the diffuser 30, and one of the radially outer ends 82 of the partition member 80 contacts the connection portion between the outlet casing 40 and the compressed fluid discharge pipe 50. It touches. Further, a side connecting the radially inner end 81 and one of the radially outer ends 82 of the partition member 80 and a radially inner end 81 of the partition member 80 and the other 83 of the radially outer ends are connected. Each side has a concave shape. By making both sides of the partition member 80 into such a shape, the flow of compressed air in the circumferential direction of the outlet casing 40 and the flow to the compressed fluid discharge pipe 50 can be made smooth.

  The dotted line in FIG. 6 is the flow of the compressed fluid in the outlet casing 40 of the axial flow compressor 1B according to the second embodiment of the present invention. Since the axial flow compressor 1B according to the second embodiment of the present invention includes the partition member 80, the compressed air is prevented from flowing into the compressed air discharge pipe 50 from the left and right sides of FIG. Can do.

  Moreover, since the axial flow compressor 1B which concerns on 2nd embodiment of this invention is realizable by providing the partition member 80 in the exit casing 40 of the existing axial flow compressor, it suppresses pressure loss at low cost. be able to.

<Third embodiment>
Next, an axial flow compressor according to a third embodiment of the present invention will be described with reference to FIG. 7 focusing on differences from the axial flow compressor 1A according to the first embodiment. FIG. 7 is a view for explaining a horn-like member provided in the outlet casing of the axial compressor according to the third embodiment of the present invention, and is a cross-sectional view seen from the X1 direction of FIG. . In FIG. 7, the diffuser 30 is omitted.

  As shown in FIG. 7, the axial flow compressor 1 </ b> C according to the third embodiment of the present invention includes a horn member 60 </ b> C instead of the horn member 60 </ b> A and the partition member 70. The horn-shaped member 60C is different from the horn-shaped member 60A according to the first embodiment in that the compressed fluid flows on the upstream side in the rotational direction R of the rotor 22 at the portion where the outlet casing 40 and the compressed fluid discharge pipe 50 are connected. The outlet casing 40 is shaped so as to block the outlet casing 40 from flowing in the circumferential direction. The horn-shaped member 60C is fixed to the diffuser 30 with bolts, for example.

  1C of axial flow compressors which concern on 3rd embodiment of this invention are the horns which block | close the outlet casing 40 in the most upstream part of the rotation direction R of the rotor 22 of the site | part to which the outlet casing 40 and the compressed fluid discharge pipe 50 were connected. Since the member 60C is provided, the partition member 70 is unnecessary, and the same effect as the axial flow compressor 1A according to the first embodiment can be obtained while reducing the number of parts.

  Moreover, since the axial flow compressor 1C according to the third embodiment of the present invention can be realized by providing the horn-like member 60C in the outlet casing 40 of the existing axial flow compressor, the pressure loss can be reduced at a low cost. Can be suppressed.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, A design change is possible suitably in the range which does not deviate from the summary of this invention. For example, the partition member 70 can be omitted in the axial flow compressor 1A according to the first embodiment. The materials of the horn-shaped members 60A and 60C and the partition members 70 and 80 can be changed as appropriate. Further, the horn upper members 60A and 60C may be hollow for weight reduction.

  In addition, regarding the method for fixing the horn-shaped member 60A to the diffuser 30, as shown in FIG. 8, the horn-shaped member 60A is shaped so as to follow the end portion of the diffuser 30, and the through holes formed in the diffuser 30 are formed. The horn-shaped member 60A can be fixed to the diffuser 30 by screwing the bolt B into the screw hole formed in the horn-shaped member 60A.

  Further, as shown in FIG. 9, the partition member 80 may have the same outer shape as the partition member 80 shown in FIG. 5 by combining two plate-like members 80 a and 80 b having curved surfaces.

1A, 1B, 1C Axial flow compressor 10 Inlet casing 20 Fluid compression section 21 Central casing 21a Stator blade 22 Rotor 22a Rotor blade 30 Diffuser 40 Outlet casing 50 Compressed fluid discharge pipe 60A, 60C Horn-shaped member 70, 80 Partition member

Claims (4)

An inlet casing into which the fluid flows,
A fluid compression section for compressing the fluid sent from the inlet casing;
A diffuser through which the fluid compressed by the fluid compression section flows;
An outlet casing that has a hollow ring shape and through which the fluid sent from the diffuser flows;
A compressed fluid discharge pipe connected to the outlet casing and discharging the fluid sent from the outlet casing to the radially outer side of the outlet casing;
With
The fluid compression section is an axial compressor including a central casing having a stationary blade standing on an inner surface, and a rotor having a moving blade standing on the outer surface provided in the central casing. ,
The diffuser exhibits a shape in which the fluid flows radially outward of the outlet casing at the end opposite to the rotor in the outlet casing.
In the outlet casing, an annular horn-shaped member whose cross-sectional area decreases from the upstream side in the rotational direction of the rotor at the portion where the outlet casing and the compressed fluid discharge pipe are connected to each other in the rotational direction of the rotor. An axial flow compressor is provided. The horn-shaped member and the outlet casing are arranged so as to block the fluid from flowing in the circumferential direction of the outlet casing on the upstream side in the rotational direction of the rotor at a portion where the outlet casing and the compressed fluid discharge pipe are connected. The axial flow compressor according to claim 1, further comprising a partition member that closes the gap. The horn-shaped member is configured to prevent the fluid from flowing in the circumferential direction of the outlet casing on the upstream side in the rotation direction of the rotor at a portion where the outlet casing and the compressed fluid discharge pipe are connected. The axial flow compressor according to claim 1, wherein the axial flow compressor has a shape for closing the casing. An inlet casing into which the fluid flows,
A fluid compression section for compressing the fluid sent from the inlet casing;
A diffuser through which the fluid compressed by the fluid compression section flows;
An outlet casing that has a hollow ring shape and through which the fluid sent from the diffuser flows;
A compressed fluid discharge pipe connected to the outlet casing and discharging the fluid sent from the outlet casing to the radially outer side of the outlet casing;
With
The fluid compression section is an axial compressor including a central casing having a stationary blade standing on an inner surface, and a rotor having a moving blade standing on the outer surface provided in the central casing. ,
The diffuser exhibits a shape in which the fluid flows radially outward of the outlet casing at the end opposite to the rotor in the outlet casing.
In the outlet casing, the fluid is blocked from flowing in the circumferential direction of the outlet casing on the upstream side in the rotational direction of the rotor at a portion where the outlet casing and the compressed fluid discharge pipe are connected. An axial compressor having a partition member for closing the outlet casing.

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