Novel machine shell structure and centrifugal compressor

Abstract

The utility model belongs to the technical field of centrifugal compressors, and particularly provides a novel machine shell structure and a centrifugal compressor, the novel machine shell structure comprises a shell, an end plate and an end cover, the end plate and the end cover are arranged at the two ends of the shell, the end cover is of an integral structure, and the end cover is connected with the end plate; and the end cover is arranged on the radial inner side of the end plate. The end cover is arranged to be of an integral structure, so that the dry gas sealing device assembled on the end cover can be prevented from being split into an upper half and a lower half along with the shell, the dry gas sealing device can be prevented from being damaged in the process of checking the centrifugal compressor, and then the working stability and safety of the centrifugal compressor can be improved; meanwhile, by arranging the partition plate seam allowance, a supporting ring can be omitted, a partition plate can be directly assembled on the inner wall of the shell, the radial size of the centrifugal compressor can be reduced, accordingly, radial force and axial force borne by the dry gas sealing device in the centrifugal compressor pressure test process are weakened, and the risk that the dry gas sealing device leaks process gas due to deformation is reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of centrifugal compressors, and in particular relates to a novel casing structure and a centrifugal compressor. Background Art

[0002] The casing of a traditional large centrifugal compressor is a horizontally split structure, which is easy to install and easy to maintain. The casing of a horizontally split centrifugal compressor is split into two halves at the flange connection position on the center split surface, and its shaft end sealing device (hereinafter referred to as the dry gas sealing device) is also split into two halves along with the casing.

[0003] Centrifugal compressors need to be inspected before leaving the factory. After the centrifugal compressor has undergone a pressure test, the horizontally split dry gas seal device may be deformed or misaligned. If the misalignment of the dry gas seal device is not found before the centrifugal compressor is subjected to a dry gas seal no-load test, the misalignment may cut off the dry gas seal rubber ring, causing damage to the dry gas seal device and the risk of leaking process gas. Utility Model Content

[0004] Therefore, the technical problem to be solved by the present application is to provide a new casing structure and a centrifugal compressor. By setting the end cover as an integral structure, the dry gas sealing device assembled on the end cover can be prevented from being randomly split into two halves, thereby preventing the dry gas sealing device from being damaged during the inspection of the centrifugal compressor.

[0005] In order to solve the above problems, the present application provides a new casing structure on the one hand, including an outer shell and end plates and end covers arranged at both ends of the outer shell, wherein the end cover is an integral structure, the end cover is connected to the end plate, and the end cover is arranged on the radial inner side of the end plate.

[0006] Optionally, a first mounting surface and a second mounting surface are provided on a side of the end plate close to the end cover, the end surface on the axial side of the end cover is connected to the first mounting surface, and the outer wall surface on the radial side of the end cover is connected to the second mounting surface.

[0007] Optionally, the novel housing structure further includes a sealing member, wherein the sealing member is disposed between the first mounting surface and an end surface on the axial side of the end cover.

[0008] Optionally, at least two sealing members are provided, and at least two of the sealing members are located in the same plane.

[0009] Optionally, a partition stop is provided on the inner wall of the shell.

[0010] Optionally, a support ring is further provided on the inner wall of the shell.

[0011] Optionally, the shell includes an upper shell and a lower shell which are split horizontally, and the upper shell and the lower shell are connected by a first bolt to form the shell.

[0012] Optionally, the end plate includes an upper sealing plate and a lower sealing plate which are split horizontally, and the upper sealing plate and the lower sealing plate are connected by a second bolt to form the end plate.

[0013] Optionally, the novel casing structure further includes an external pipe, and the external pipe flange is connected to the end cover.

[0014] Another aspect of the present application provides a centrifugal compressor, comprising any one of the novel casing structures described above.

[0015] Beneficial Effects

[0016] An embodiment of the utility model provides a new casing structure and a centrifugal compressor, wherein the new casing structure can avoid the dry gas sealing device assembled on the end cover from being split into upper and lower halves along with the random casing by setting the end cover as an integral structure, thereby avoiding damage to the dry gas sealing device during inspection of the centrifugal compressor, thereby improving the working stability and safety of the centrifugal compressor; at the same time, by setting a partition stop, the support ring can be eliminated and the partition can be directly assembled on the inner wall of the outer casing, which can reduce the radial size of the centrifugal compressor, thereby reducing the radial force and axial force exerted on the dry gas sealing device during the pressure test of the centrifugal compressor, and reducing the risk of leakage of process gas due to deformation of the dry gas sealing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A cross-sectional view of a novel housing structure according to an embodiment of the present application;

[0018] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0019] Figure 3 A top view of a novel housing structure according to an embodiment of the present application;

[0020] Figure 4 It is a side view of the novel casing structure of an embodiment of the present application.

[0021] The reference numerals are:

[0022] 1. Outer shell; 2. End plate; 3. End cover; 4. Seal; 5. Partition stopper; 6. Support ring; 7. First bolt; 8. Second bolt; 9. External pipe. DETAILED DESCRIPTION

[0023] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0025] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0026] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0027] See also Figures 1 to 4 As shown, according to one aspect of an embodiment of the present application, a new type of casing structure is provided, including an outer shell 1 and end plates 2 and end covers 3 arranged at both ends of the outer shell 1, the end cover 3 is an integral structure, the end cover 3 is connected to the end plate 2, and the end cover 3 is arranged on the radial inner side of the end plate 2.

[0028] The new casing structure provided in the embodiment of the utility model can avoid the dry gas sealing device assembled on the end cover 3 from being randomly split into two halves by setting the end cover 3 as an integral structure, thereby avoiding damage to the dry gas sealing device during the inspection of the centrifugal compressor, and further improving the stability and safety of the operation of the centrifugal compressor.

[0029] Among them, the new casing structure can be applied to centrifugal compressors.

[0030] Specifically, the novel casing structure is a stator component of a centrifugal compressor, and is used to accommodate and support a rotor component of the centrifugal compressor.

[0031] The novel casing structure includes an outer shell 1, an end plate 2 and an end cover 3. The outer shell 1 is roughly cylindrical, and the end plate 2 and the end cover 3 are roughly annular.

[0032] There are two end covers 3 , which are respectively arranged at two ends of the housing 1 in the axial direction.

[0033] Specifically, the dry gas sealing device at the shaft end of the centrifugal compressor can be assembled on the end cover 3. Since the end cover 3 is an integral structure, the dry gas sealing device assembled on the end cover 3 can be avoided from being randomly split into two halves, that is, the dry gas sealing device assembled on the end cover 3 is also an integral structure, which can improve the pressure-bearing capacity of the dry gas sealing device, thereby preventing the dry gas sealing device from being damaged during the inspection of the centrifugal compressor, so that the centrifugal compressor can operate safely and stably.

[0034] The end plate 2 is arranged on the radial outer side of the end cover 3 , and the end cover 3 is connected to the housing 1 through the end plate 2 .

[0035] Specifically, the end plate 2 and the end cover 3 are located in the same vertical plane. It is understandable that the size of the end cover 3 can be reduced by providing the end plate 2, thereby reducing the difficulty of processing the end cover 3, reducing the production cost of the end cover 3, and being adaptable to large centrifugal compressors.

[0036] In some possible implementations provided by the present disclosure, see Figure 2 As shown, a first mounting surface and a second mounting surface are provided on one side of the end plate 2 close to the end cover 3, the end surface on the axial side of the end cover 3 is connected to the first mounting surface, and the outer wall surface on the radial side of the end cover 3 is connected to the second mounting surface.

[0037] An annular groove is provided on the radial inner wall surface of the end plate 2 to form a first mounting surface and a second mounting surface.

[0038] Specifically, in the embodiment of the present application, the first mounting surface is parallel to the vertical surface, and the second mounting surface is perpendicular to the first mounting surface.

[0039] When the end cover 3 is connected to the end plate 2, the outer edge of the end cover 3 can be embedded in the retaining ring groove on the inner wall surface of the end plate 2. At this time, the end surface of the axial side of the end cover 3 abuts against the first mounting surface, and the outer wall surface of the radial side of the end cover 3 abuts against the second mounting surface.

[0040] Specifically, in the embodiment of the present application, the end plate 2 and the end cover 3 are connected by bolts, and the bolts penetrate the end plate 2 and the end cover 3 in a direction perpendicular to the first mounting surface to fix the end cover 3 and the end plate 2. It should be noted that the first mounting surface is the sealing surface between the end cover 3 and the end plate 2, and the second mounting surface is the supporting surface between the end cover 3 and the end plate 2. By arranging the end cover 3 to cooperate with the end plate 2 in the radial and axial directions of the shell 1, on the one hand, the sealing between the end cover 3 and the end plate 2 can be improved, and on the other hand, the end plate 2 and the shell 1 can be positioned and supported.

[0041] In some possible implementations provided by the present disclosure, see Figure 2 As shown, the novel housing structure further includes a sealing member 4 , which is arranged between the first mounting surface and the end surface of the end cover 3 on the axial side.

[0042] By providing a seal 4 between the first mounting surface and the end surface on the axial side of the end cover 3, leakage of process gas at the joint surface between the end plate 2 and the end cover 3 can be avoided, thereby improving the sealing performance of the centrifugal compressor and ensuring that the centrifugal compressor can operate safely and stably.

[0043] The sealing member 4 may be a high temperature resistant O-ring or the like.

[0044] Specifically, as one embodiment, an annular groove is opened on the first mounting surface, and the seal 4 is arranged in the groove; as another embodiment, an annular groove is opened on the end surface of the axial side of the end cover 3, and the seal 4 is arranged in the groove.

[0045] In some possible embodiments provided by the present disclosure, at least two seals 4 are provided, and at least two seals 4 are located in the same plane.

[0046] Among them, at least two seals 4 are provided. For example, two, three, four or five seals 4 can be provided. It is understandable that when the number of seals 4 increases, the sealing effect is better, but the cost will be increased. In the embodiment of the present application, two seals 4 are provided. By providing two seals 4, the sealing effect can be improved while taking into account the cost.

[0047] Specifically, the two seals 4 are located in the same plane. In the embodiment of the present application, the two seals 4 are located in the same vertical plane, and the two seals 4 are arranged between the first mounting surface and the end surface of the axial side of the end cover 3. It is noted that the seal 4 is an O-ring, and the two O-rings have different diameters. The O-ring with a larger diameter is used for primary sealing, and the O-ring with a smaller diameter is used for secondary sealing, so that the joint surface between the end plate 2 and the end cover 3 has good sealing performance.

[0048] In some possible implementations provided by the present disclosure, see Figure 1As shown, a partition stop 5 is provided on the inner wall of the housing 1.

[0049] By opening a partition stop 5 on the inner wall of the outer shell 1, the partition can be directly assembled, and the purpose of eliminating the support ring 6 can be achieved, thereby reducing the radial size of the centrifugal compressor, reducing the radial force and axial force exerted on the dry gas sealing device during the pressure test of the centrifugal compressor, and reducing the risk of leakage of process gas due to deformation of the dry gas sealing device, thereby improving the stability and safety of the centrifugal compressor.

[0050] The stopper 5 of the partition plate may be an annular groove that matches the shape of the outer edge of the partition plate, so that the outer edge of the partition plate can be embedded in the stopper 5 of the partition plate.

[0051] Specifically, on the one hand, by opening a partition stop 5 on the inner wall of the shell 1, the partition can be limited in the axial direction of the shell 1; on the other hand, by opening a partition stop 5 on the inner wall of the shell 1, the partition can be supported in the radial direction of the shell 1.

[0052] In some possible implementations provided by the present disclosure, see Figure 1 As shown, a supporting ring 6 is further provided on the inner wall of the housing 1 .

[0053] By providing the support ring 6, the partition plate with a lower flow channel position can be supported in the housing 1, so as to improve the rigidity of the centrifugal compressor.

[0054] The radial outer wall of the support ring 6 abuts against the inner wall of the housing 1, and the radial inner wall of the support ring 6 abuts against the partition.

[0055] It should be noted that in the embodiment of the present application, the partition with a larger radial dimension is directly abutted against the inner wall of the outer shell 1 through the partition stop 5, and the partition with a smaller radial dimension is abutted against the outer shell 1 through the support ring 6, which can reduce the radial dimension of the centrifugal compressor while improving the rigidity of the centrifugal compressor.

[0056] In some possible implementations provided by the present disclosure, see Figure 3 and Figure 4 As shown, the housing 1 includes an upper housing and a lower housing which are split horizontally. The upper housing and the lower housing are connected by first bolts 7 to form the housing 1 .

[0057] By providing the casing 1 with an upper shell and a lower shell connected to each other, the difficulty of installing and repairing the centrifugal compressor can be reduced, the purpose of reducing the production cost of the centrifugal compressor can be achieved, and it is beneficial to improve the competitiveness of centrifugal compressor products in the market.

[0058] The upper shell and the lower shell are roughly semicircular arc-shaped, so that the upper shell and the lower shell are buckled together to form a cylindrical shell 1.

[0059] The first bolt 7 may be a bolt for joining the face flange in the housing 1 .

[0060] Specifically, a plurality of first bolts 7 are provided, and the plurality of first bolts 7 are neatly arranged in the engaging area of ​​the housing 1 .

[0061] The joint area of ​​the housing 1 is the position where the upper housing and the lower housing are fitted together.

[0062] It should be noted that the thickness and material of the upper casing and the lower casing are set according to the pressure requirements of the centrifugal compressor, and the specification and grade of the first bolt 7 are also set according to the pressure requirements of the centrifugal compressor.

[0063] In some possible implementations provided by the present disclosure, see Figure 3 and Figure 4 As shown, the end plate 2 includes an upper sealing plate and a lower sealing plate which are split horizontally, and the upper sealing plate and the lower sealing plate are connected by second bolts 8 to form the end plate 2.

[0064] By providing an end plate 2 composed of an upper sealing plate and a lower sealing plate connected together, the difficulty of installing and repairing the centrifugal compressor can be reduced, the purpose of reducing the production cost of the centrifugal compressor can be achieved, and it is beneficial to improve the competitiveness of centrifugal compressor products in the market.

[0065] The upper sealing plate and the lower sealing plate are roughly semicircular, so that the upper sealing plate and the lower sealing plate are buckled to form a ring-shaped end plate 2.

[0066] Among them, the second bolt 8 can be a handle and bolt of the end plate 2.

[0067] Specifically, a plurality of second bolts 8 are provided, and the plurality of second bolts 8 are evenly arranged in the area outside the projection of the first bolts 7 in the engagement area of ​​the end plate 2 .

[0068] The joining area of ​​the end plate 2 is the position where the upper sealing plate and the lower sealing plate are in contact with each other.

[0069] It should be noted that by providing the second bolt 8, the upper sealing plate and the lower sealing plate can fit tightly together, thereby improving the sealing performance of the joint surface between the upper sealing plate and the lower sealing plate, preventing process gas leakage, and improving the stability and safety of the centrifugal compressor.

[0070] In some possible implementations provided by the present disclosure, see Figure 1 As shown, the novel casing structure further includes an external pipe 9 , which is flange-connected to the end cover 3 .

[0071] By arranging the external pipe 9 to be flange-connected to the end cover 3 , it is convenient to disassemble and assemble the external pipe 9 of the centrifugal compressor, thereby improving the user experience.

[0072] Another aspect of an embodiment of the present application provides a centrifugal compressor comprising any one of the novel casing structures described above.

[0073] An embodiment of the utility model provides a new casing structure and a centrifugal compressor, wherein the new casing structure can avoid the dry gas sealing device assembled on the end cover 3 from being split into upper and lower halves along with the random casing by setting the end cover 3 as an integral structure, thereby avoiding damage to the dry gas sealing device during inspection of the centrifugal compressor, thereby improving the working stability and safety of the centrifugal compressor; at the same time, by setting the partition stop 5, the support ring 6 can be eliminated and the partition can be directly assembled on the inner wall of the outer casing 1, which can reduce the radial size of the centrifugal compressor, thereby reducing the radial force and axial force exerted on the dry gas sealing device during the pressure test of the centrifugal compressor, and reducing the risk of leakage of process gas due to deformation of the dry gas sealing device.

[0074] It is easy for those skilled in the art to understand that the above-mentioned advantageous methods can be freely combined and superimposed without conflict.

[0075] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A new housing structure, characterized in that: The invention comprises a shell (1) and an end plate (2) and an end cover (3) arranged at both ends of the shell (1); the end cover (3) is an integral structure; the end cover (3) is connected to the end plate (2); and the end cover (3) is arranged on the radial inner side of the end plate (2).

2. The novel housing structure according to claim 1 is characterized in that: A first mounting surface and a second mounting surface are provided on a side of the end plate (2) close to the end cover (3); the end surface on the axial side of the end cover (3) is connected to the first mounting surface, and the outer wall surface on the radial side of the end cover (3) is connected to the second mounting surface.

3. The novel housing structure according to claim 2 is characterized in that: The novel housing structure further comprises a sealing member (4), wherein the sealing member (4) is arranged between the first mounting surface and the end surface on the axial side of the end cover (3).

4. The novel housing structure according to claim 3 is characterized in that: At least two sealing members (4) are provided, and at least two sealing members (4) are located in the same plane.

5. The novel housing structure according to claim 1 is characterized in that: A partition stop (5) is provided on the inner wall of the outer shell (1).

6. The novel housing structure according to claim 1 is characterized in that: A supporting ring (6) is also provided on the inner wall of the outer shell (1).

7. The novel housing structure according to claim 1 is characterized in that: The housing (1) comprises an upper housing and a lower housing which are split horizontally, and the upper housing and the lower housing are connected by a first bolt (7) to form the housing (1).

8. The novel housing structure according to claim 1 is characterized in that: The end plate (2) comprises an upper sealing plate and a lower sealing plate which are split horizontally, and the upper sealing plate and the lower sealing plate are connected by a second bolt (8) to form the end plate (2).

9. The novel housing structure according to claim 1 is characterized in that: The novel casing structure further comprises an external pipe (9), wherein the external pipe (9) is flange-connected to the end cover (3).

10. A centrifugal compressor, characterized in that: The invention comprises a novel casing structure as described in any one of claims 1 to 9.

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