Centrifugal compressor shell assembly with laterally-biased air inlet

Abstract

The utility model provides a centrifugal compressor shell assembly with a laterally-biased air inlet, which mainly solves the technical problems that the distance between each air inlet flange and each air outlet flange of the existing centrifugal compressor is small, the air inlet flanges and the air outlet flanges are easy to interfere with each other during assembly and disassembly, inconvenience is brought to assembly and maintenance, and the like. The machine shell assembly is mainly characterized in that a first flow guide plate and a second flow guide plate are laterally arranged in an offset mode, the included angle between the plane where the first flow guide plate and the second flow guide plate are located and the middle split face of a shell is 90 degrees-theta, and theta is larger than 0 degree and smaller than or equal to 30 degrees; the air inlet is formed in the lower side of the shell in an offset mode, the central axis of the air inlet perpendicularly intersects with the central axis of the shell, and the air inlet is located in the plane where the first flow guide plate and the second flow guide plate are located. The air outlet is arranged on the lower side of the shell in an offset mode and staggered with the air inlet, and the central axis of the air outlet perpendicularly intersects with the central axis of the shell. According to the structural design, the air inlet cylinder assembly and the air outlet cylinder assembly are arranged in a staggered mode, and then assembling and maintaining convenience is improved.

Description

Technical Field

[0001] The utility model relates to a centrifugal compressor, in particular to a centrifugal compressor casing component with a laterally offset air inlet. Background Art

[0002] Centrifugal compressors are mainly used to transport air and other chemical gases, and are widely used in the fields of petroleum, chemical industry, metallurgy, and pharmaceuticals. At present, the commonly used centrifugal compressors are horizontally split structures, and their casing is the shell that contains the rotor, and the air inlet chamber and volute are part of the air flow channel. In recent years, the scale of various process devices has gradually increased. In order to make their structures more stable, more and more horizontally split centrifugal compressor casings are welded with steel plates. The welded casing has the advantages of flexible and changeable structure and reduced casting wood mold process.

[0003] As the scale of devices in various industrial processes continues to increase, the requirements for centrifugal compressor models and applicable pressures are becoming increasingly higher. The larger the model, the greater the intake and exhaust flow, and the larger the intake and exhaust flanges, which increases the size of the welded casing, resulting in an increase in the size and weight of the compressor. The casing of a centrifugal compressor is a pressure-bearing component, and the larger the casing, the lower its pressure-bearing capacity, which in turn affects its working stability and reliability.

[0004] In addition, compared with centrifugal compressors with multiple stages of air extraction and air replenishment, the air intake duct of the horizontally split centrifugal compressor is arranged directly below the casing, and the spacing between the various air intake and exhaust flanges is small, which is easy to interfere with each other during assembly and disassembly, causing inconvenience to assembly and maintenance. Utility Model Content

[0005] The utility model aims to provide a centrifugal compressor casing assembly with a laterally offset air inlet, mainly to solve the technical problems that the spacing between the inlet and exhaust flanges of the existing centrifugal compressor is small, which is easy to interfere with each other during assembly and disassembly, causing inconvenience to assembly and maintenance.

[0006] To achieve the above purpose, the technical solution of the utility model is as follows:

[0007] A centrifugal compressor casing assembly with a laterally offset air inlet comprises a casing, an air inlet and an air outlet respectively arranged along the radial direction of the casing, an air inlet cylinder assembly and a first guide plate respectively arranged at the air inlet, an air outlet cylinder assembly arranged at the air outlet, and a second guide plate sequentially arranged in the casing; the special feature of the invention is that:

[0008] The first guide plate and the second guide plate are both laterally offset, wherein the first guide plate is installed in the air intake cylinder assembly; the second guide plate is radially installed on the inner wall of the shell;

[0009] The first guide plate and the second guide plate are located in the same plane, the plane where the two guide plates are located passes through the central axis of the shell, and the angle between the plane and the center plane of the shell is (90°-θ), wherein 0°<θ≤30°;

[0010] The air inlet is offsetly arranged at the lower side of the shell, the central axis of the air inlet intersects the central axis of the shell perpendicularly, and is located in the plane where the first guide plate and the second guide plate are located;

[0011] The air outlet is offsetly arranged at the lower side of the shell and staggered with the air inlet, and the central axis of the air outlet intersects the central axis of the shell perpendicularly.

[0012] Furthermore, the air intake cylinder assembly comprises a first cylinder, a second cylinder and a flange which are arranged in sequence;

[0013] The first cylinder is a conical cylinder, and its large conical end is adapted to be connected with the air inlet; the first guide plate is located in the first cylinder and connected with the inner wall of the first cylinder;

[0014] One end face of the second cylinder is an inclined surface and is adaptably connected to the small conical end of the first cylinder; the central axis of the conical cylinder coincides with the central axis of the air inlet and passes through the center point of the inclined surface of the second cylinder; the other end of the second cylinder is a plane and is adaptably connected to the flange.

[0015] Furthermore, the outlet bag assembly has the same structure as the inlet bag assembly, wherein there is a gap between the side walls of the flange in the outlet bag assembly and the flange in the inlet bag assembly, and the planes where the two are located are respectively parallel to the center plane of the shell.

[0016] Furthermore, a distance L1 between the central axes of the flange in the air inlet assembly and the flange in the air outlet assembly along the central axis of the shell is smaller than a distance L2 between the central axes of the two.

[0017] Furthermore, one end of the second guide plate is connected to the inner wall of the shell, and diverter plates are respectively provided on both sides of the other end. The two diverter plates are symmetrically arranged on both sides of the second guide plate, and their ends close to each other are respectively connected to the other end of the second guide plate, and their ends far away from each other are respectively connected to the inner wall of the shell.

[0018] Furthermore, the diverter plate is an arc-shaped structure and is recessed toward the inner wall of the shell.

[0019] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0020] 1. The utility model provides a centrifugal compressor casing assembly with a laterally offset air inlet, which offsets the first guide plate, the second guide plate, the air inlet and the air outlet laterally, so that the air inlet cylinder assembly and the air outlet cylinder assembly are staggered, thereby avoiding mutual interference between the air inlet cylinder assembly and the air outlet cylinder assembly during assembly and disassembly, thereby improving the convenience of assembly and maintenance.

[0021] 2. The utility model provides a centrifugal compressor casing assembly with a laterally offset air inlet, which can reduce the outer diameter of the casing and thus reduce the overall weight of the casing, provided that the intake and exhaust flow rates, gas fluidity, etc. meet the requirements.

[0022] 3. The utility model provides a centrifugal compressor casing assembly with a laterally offset air inlet, which increases the distance between the central axes of the flange of the air inlet cylinder assembly and the flange of the air outlet cylinder assembly, thereby improving the processing technology of the casing and facilitating the connection of air inlet and exhaust pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a side structural schematic diagram of an embodiment of a centrifugal compressor casing assembly with a laterally offset air inlet according to the utility model.

[0024] Figure 2 The utility model is a schematic diagram of the position relationship between the air inlet and the air outlet in an embodiment of a centrifugal compressor casing assembly with a laterally offset air inlet.

[0025] Figure 3 It is a schematic structural diagram of an air inlet and an air inlet cylinder assembly in an embodiment of a centrifugal compressor casing assembly with a laterally offset air inlet of the utility model.

[0026] The reference numerals are as follows:

[0027] 1-shell, 2-air inlet, 3-air outlet, 4-first guide plate, 5-second guide plate, 6-first cylinder, 7-second cylinder, 8-flange, 9-dividing plate. DETAILED DESCRIPTION

[0028] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] like Figure 1 and Figure 2As shown, this embodiment provides a centrifugal compressor casing assembly with a laterally offset air inlet, which is still welded by forgings and plates, and includes a casing 1, an air inlet 2 and an air outlet 3 respectively arranged along the radial direction of the casing 1, an air inlet cylinder assembly and a first guide plate 4 respectively arranged at the air inlet 2, an air outlet cylinder assembly arranged at the air outlet 3, and a second guide plate 5 sequentially arranged in the casing 1. In addition, when the casing assembly of this embodiment is used to assemble a centrifugal compressor, necessary components such as a matching sealing body, a partition support plate group, a partition support ring, a guide plate, a casing pipe (such as a shower pipe, a dry gas sealing pipe, a casing sewage pipe, etc.), a guide key, a casing lifting ear, and some reinforcing ribs are also required.

[0030] The shell 1 of this embodiment includes a semi-cylindrical upper shell and a lower shell that are connected to each other, and the upper shell and the lower shell together form a cylindrical structure; the plane where the connecting surface of the upper shell and the lower shell is located is the center plane, and the central axis of the cylindrical structure is located on the center plane.

[0031] In order to effectively utilize the space of the chamber, this embodiment adjusts the structure of the inlet and outlet chambers, and modifies the inlet and outlet flow guide device. Specifically, the first flow guide plate 4 and the second flow guide plate 5 are both offset laterally so that they are located in the same plane, and the plane where the two are located passes through the central axis of the shell 1 and the angle between the plane and the center plane of the shell 1 is (90°-θ), where 0°<θ≤30°. In practical applications, the offset angle can be specifically set according to the size of the flange or the size of the casing, so as to avoid mutual interference between the inlet and outlet flanges during installation.

[0032] One end of the second guide plate 5 is welded to the inner wall of the housing 1, and a splitter plate 9 is provided on both sides of the other end. The two splitter plates 9 are symmetrically arranged on both sides of the second guide plate 5 in a horizontal radial support form, and their ends close to each other are respectively connected to the other end of the second guide plate 5, and their ends away from each other are respectively connected to the inner wall of the housing 1. The splitter plate 9 in this embodiment is an arc-shaped structure, and is concave toward the inner wall of the housing 1 (that is, concave toward the side away from the central axis of the housing 1), so as to form a smooth airflow channel.

[0033] The air inlet 2 is offset at the lower side of the housing 1, and the central axis of the air inlet 2 intersects the central axis of the housing 1 perpendicularly, and is located in the plane where the first guide plate 4 and the second guide plate 5 are located. At the same time, the air outlet 3 is offset at the lower side of the housing 1 and is staggered with the air inlet 2, and the central axis of the air outlet 3 intersects the central axis of the housing 1 perpendicularly, thereby realizing the staggered setting of the air inlet cylinder assembly and the air outlet cylinder assembly.

[0034] like Figure 3As shown, the air intake cylinder assembly includes a first cylinder 6, a second cylinder 7 and a flange 8 which are arranged in sequence, and are generally formed by welding. The first cylinder 6 is a conical cylinder, and its large conical end is adapted to be connected with the side wall of the air intake port 2, and the first guide plate 4 is welded to the inner wall of the first cylinder 6. One end face of the second cylinder 7 is an inclined surface, and is adapted to be connected with the small conical end of the first cylinder 6; the central axis of the conical cylinder coincides with the central axis of the air intake port 2 and passes through the central point of the inclined surface of the second cylinder 7; the other end of the second cylinder 7 is a plane and is adapted to be connected with the flange 8.

[0035] The structure of the air outlet assembly is the same as that of the air inlet assembly, wherein there is a gap between the flange in the air outlet assembly and the side wall of the flange 7 of the air inlet assembly, and the planes where the two are located are parallel to the center plane of the shell 1.

[0036] Combination Figure 2 and Figure 3 As shown, in this embodiment, the distance L1 between the central axis of the flange 8 of the air inlet cylinder assembly and the central axis of the flange in the air outlet cylinder assembly along the central axis of the shell 1 is smaller than the distance L2 between the central axes of the two. This arrangement can reduce the overall outer diameter of the casing, thereby reducing the weight of the casing and the weight of the compressor unit.

[0037] The utility model aims at the shortcomings of conventional large-scale horizontal split centrifugal compressors, such as low pressure bearing capacity of the casing, small spacing between inlet and exhaust flanges, easy interference, and inconvenient inspection and maintenance. The utility model reduces the size of the outer shell plate, effectively utilizes the space of the chamber, and offsets the inlet and exhaust flanges laterally. The overall size of the compressor can be effectively reduced, the weight of the compressor can be reduced, the cost can be reduced, the structure is more compact, the compressor occupies a small area, and the larger the model, the more obvious this advantage. The utility model can be applied to isopropyl acetate production lines above 100,000 tons.

[0038] Based on the above embodiments, ordinary technicians are sufficient to implement the content of the utility model. Within the framework of the claims, any improvement based on the inventive concept of the utility model is deemed to fall within the protection scope of the utility model.

Claims

1. A centrifugal compressor casing assembly with a laterally offset air inlet, comprising a casing (1), an air inlet (2) and an air outlet (3) respectively arranged along the radial direction of the casing (1), an air inlet cylinder assembly and a first guide plate (4) respectively arranged at the air inlet (2), an air outlet cylinder assembly arranged at the air outlet (3), and a second guide plate (5) arranged in the casing (1), characterized in that: The first guide plate (4) and the second guide plate (5) are both laterally offset, wherein the first guide plate (4) is installed in the air intake cylinder assembly; and the second guide plate (5) is radially installed on the inner wall of the housing (1); The first guide plate (4) and the second guide plate (5) are located in the same plane, the plane where the two guide plates are located passes through the central axis of the shell (1), and the angle between the plane and the median plane of the shell (1) is (90°-θ), wherein 0°<θ≤30°; The air inlet (2) is offsetly arranged on the lower side of the shell (1), the central axis of the air inlet (2) intersects the central axis of the shell (1) perpendicularly, and is located in the plane where the first guide plate (4) and the second guide plate (5) are located; The air outlet (3) is offsetly arranged on the lower side of the shell (1) and staggered with the air inlet (2); the central axis of the air outlet (3) intersects the central axis of the shell (1) perpendicularly.

2. The centrifugal compressor casing assembly with a laterally offset air inlet according to claim 1, characterized in that: The air intake cylinder assembly comprises a first cylinder (6), a second cylinder (7) and a flange (8) which are arranged in sequence; The first cylinder (6) is a conical cylinder, and its large conical end is adapted to be connected to the air inlet (2); the first guide plate (4) is located inside the first cylinder (6) and is connected to the inner wall of the first cylinder (6); One end surface of the second cylinder (7) is an inclined surface and is adaptably connected to the small conical end of the first cylinder (6); the central axis of the conical cylinder coincides with the central axis of the air inlet (2) and passes through the central point of the inclined surface of the second cylinder (7); the other end of the second cylinder (7) is a plane and is adaptably connected to the flange (8).

3. The centrifugal compressor casing assembly with a laterally offset air inlet according to claim 2, characterized in that: The outlet tube assembly has the same structure as the inlet tube assembly, wherein a gap exists between the side walls of the flange in the outlet tube assembly and the flange (8) in the inlet tube assembly, and the planes where the two are located are respectively parallel to the center plane of the shell (1).

4. The centrifugal compressor casing assembly with a laterally offset air inlet according to claim 3, characterized in that: The distance L1 between the central axis of the flange (8) of the air inlet assembly and the central axis of the flange in the air outlet assembly along the central axis of the shell (1) is smaller than the distance L2 between the central axes of the two.

5. The centrifugal compressor casing assembly with a laterally offset air inlet according to any one of claims 1 to 4, characterized in that: One end of the second guide plate (5) is connected to the inner wall of the shell (1), and two sides of the other end are provided with splitter plates (9), and the two splitter plates (9) are symmetrically arranged on the two sides of the second guide plate (5), and the ends close to each other are respectively connected to the other end of the second guide plate (5), and the ends far away from each other are respectively connected to the inner wall of the shell (1).

6. The centrifugal compressor casing assembly with a laterally offset air inlet according to claim 5, characterized in that: The diverter plate (9) is an arc-shaped structure.

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