Welded volute structure

Abstract

The utility model relates to a welded volute structure which comprises a shell and an air outlet pipe, the air outlet pipe is arranged on the shell, the air outlet pipe communicates with the interior of the shell, a circulation groove allowing steam to flow is formed in the shell, a volute tongue is formed between the circulation groove and the air outlet pipe, and the volute tongue is arranged in the shell. The width of the circulating groove is gradually increased in the steam flowing direction till the circulating groove is in smooth transition with the air outlet pipe. The utility model has the effects of reducing the friction force of gas passing through the wall surface and reducing the airflow loss.

Description

Technical Field

[0001] The present application relates to the field of volutes, and in particular to a welded volute structure. Background Art

[0002] Currently, in many industrial applications, to ensure the stability and safety of fluid transmission systems, a volute structure with excellent mechanical properties is often required. However, traditional volutes are mostly produced by casting or forging, which are not only costly but also often difficult to achieve the required precise dimensional control.

[0003] In the related art, reference may be made to the Chinese invention patent with authorization announcement number CN209083681U, which discloses a titanium plate welded volute structure for an MVR steam compressor, which is composed of an air inlet impeller cover, a casing, a diffuser, and a rear flange plate; the air inlet impeller cover is installed at the front end of the casing, the diffuser is installed on the rear flange plate, and the overall structure consisting of the diffuser and the rear flange plate is installed at the rear end of the casing. The overall titanium plate welded volute structure formed by the volute has a volute tongue formed at the air outlet of the volute and the inner wall of the volute, and the volute tongue is used to reduce the circulation of gas in the casing.

[0004] The width of the volute tongue is equal to the width of the inner wall of the volute. The larger the volute tongue area, the greater the boundary layer friction of the gas passing through the wall, and the more serious the airflow loss. Utility Model Content

[0005] In order to reduce the friction of gas passing through the wall and reduce airflow loss, the present application provides a welded volute structure.

[0006] This application provides a welded volute structure, which adopts the following technical solutions:

[0007] A welded volute structure includes a shell and an air outlet pipe. The air outlet pipe is arranged on the shell and is connected to the interior of the shell. A circulation groove for air flow is opened in the shell. A volute tongue is formed between the circulation groove and the air outlet pipe. The width of the circulation groove gradually increases along the direction of steam flow until it smoothly transitions to the air outlet pipe.

[0008] By adopting the above technical solution, during the use of the volute, the turbine blades drive the steam to move in the volute. Since the circulation groove gradually increases along the flow direction of the steam, the width at the volute tongue is much smaller than the width of the volute. The flow rate of steam entering the air outlet pipe is large, which reduces the flow rate of steam entering the circulation groove. In addition, the gradual increase of the circulation groove reduces the boundary layer loss during the steam circulation process, reduces the friction passing through the wall, and has a more reasonable structure.

[0009] Optionally, the shell includes a cylinder section, two side plates and a station plate, the two side plates are respectively arranged on both sides of the station plate, the cylinder section is arranged on one of the side plates, the two side plates and the station plate form the flow groove, and the cylinder section, side plates and station plate are all connected by welding.

[0010] By adopting the above technical solution, the shell is composed of cylinder sections, side panels and station panels, which makes it easy for the shell to replace parts according to the required size and is suitable for equipment of different sizes. In addition, the cylinder sections, side panels and station panels are connected by welding, which makes the installation adaptability stronger and can improve the sealing effect of the shell.

[0011] Optionally, the cylinder sections, side panels and station panels are all of the same thickness.

[0012] By adopting the above technical solution, different thicknesses of the volute can easily lead to a decrease in the bearing capacity of the shell and a shortened service life, while the thicknesses of the cylinder section, side plate and station plate are the same, making the overall shell lighter after welding, the force more evenly distributed, and reducing the occurrence of shell wear during operation.

[0013] Optionally, both end surfaces of the shell are provided with flanges for connecting equipment.

[0014] By adopting the above technical solution, the flange is convenient for installing and fixing the shell and the equipment. The flange is widely used and has stable installation, which can improve the sealing performance of the shell.

[0015] Optionally, the outer side wall of the cylinder section is evenly distributed with a plurality of reinforcing ribs.

[0016] By adopting the above technical solution, since there is a large negative pressure inside the shell during operation, the strength of the shell can be further improved by the reinforcing ribs, the deformation of the shell can be reduced, and the life of the shell can be further improved.

[0017] Optionally, the reinforcing ribs are provided with lifting ears for facilitating the lifting of the shell.

[0018] By adopting the above technical solution, the overall mass of the worm wheel is heavier. When the worm wheel needs to be moved, it can be hoisted by the lifting lug, which facilitates the movement of the volute and improves the convenience of moving the volute.

[0019] Optionally, the air outlet pipe is in a flared shape, and the side wall of the air outlet pipe is tangent to the station plate.

[0020] By adopting the above technical solution, the outlet pipe is expanded to increase the cross-sectional area of the air outlet, reduce the resistance of the air flow, increase the air volume and reduce the noise level, and improve the total pressure and efficiency of the fan.

[0021] Optionally, the air outlet pipe is provided with a water spray hole for flushing water into the shell.

[0022] By adopting the above technical solution, the water spray hole is used to flush water into the shell, and the superheated steam and atomized water are mixed into saturated steam and passed into the volute to reduce the mixing loss of atomized water and mainstream steam.

[0023] Optionally, the angle between the water spraying direction of the water spray hole and the steam flow direction in the circulation groove is 90°-120°.

[0024] By adopting the above technical solution, the mixing loss between the atomized water and the mainstream steam can be further reduced by limiting the water spraying direction of the water spray hole.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. A volute tongue is formed between the flow groove and the air outlet pipe in the shell, and the flow groove and the air outlet pipe have a smooth transition. The volute tongue area accounts for a small proportion, the mainstream accounts for a high proportion, and the boundary layer loss of steam passing through the volute tongue wall is small;

[0027] 2. The shell is welded together by the cylinder section, side plate and station plate. The split setting facilitates the transportation of the shell, and the welding connection improves the sealing of the shell;

[0028] 3. The expanded shape of the air outlet pipe can reduce the resistance of the air flow and improve the total pressure and efficiency of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the welded volute structure.

[0030] Figure 2 yes Figure 1 The cross-sectional view of the middle shell is used to show the matching relationship between the cylinder section, side plate and station plate.

[0031] Figure 3 yes Figure 1 A side view showing the connection between the shell and the air outlet duct.

[0032] Figure 4 Used to show the positional relationship between the volute tongue and the air outlet pipe in the shell.

[0033] Figure numerals: 1. Shell; 11. Cylinder section; 12. Side panel; 13. Station panel; 14. Circulation slot; 15. Volute; 2. Air outlet pipe; 21. Throat flange; 22. Water spray hole; 3. Flange; 31. Mounting hole; 4. Reinforcement rib; 41. Lifting ear; 42. Ear hole; 5. Drain pipe. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-4 This application is described in further detail.

[0035] The embodiment of the present application discloses a welded volute structure. Figure 1 and Figure 2 A welded volute structure includes a shell 1, an air outlet pipe 2 and two flanges 3. The shell 1 includes a cylinder section 11, two side plates 12 and a station plate 13. The station plate 13 is spiral-shaped, and the axis of the station plate 13 is horizontally arranged. The two side plates 12 are respectively located on both sides of the station plate 13. The side plates 12 are fixed on the station plate 13. The cylinder section 11 is tubular, and the cylinder section 11 is parallel to the width direction of the station plate 13. The cylinder section 11 is fixed on one of the side plates 12. The cylinder section 11, the side plates 12 and the station plate 13 have the same thickness. The cylinder section 11, the side plates 12 and the station plate 13 are connected by welding.

[0036] Reference Figure 2 and Figure 3 The two side panels 12 and the station panel 13 form a flow groove 14 for steam circulation. The air outlet pipe 2 is vertically arranged, the cross-section of the air outlet pipe 2 is square, the air outlet pipe 2 is flared, and the side wall of the air outlet pipe 2 is tangent to and smoothly connected to the station panel 13. The inclination direction of the side wall of the air outlet pipe 2 does not exceed 7.5° to the vertical direction. The air outlet pipe 2 is connected to the interior of the shell 1. A volute tongue 15 is formed between the flow groove 14 and the air outlet pipe 2. The volute tongue 15 is rounded, and the width of the flow groove 14 gradually increases along the direction of steam flow until the flow groove 14 and the air outlet pipe 2 smoothly transition. A throat flange 21 is fixedly provided at one end of the air outlet pipe 2, and a water spray hole 22 for spraying water into the volute is provided on the inclined side wall of the air outlet pipe 2. The extension direction of the water spray hole 22 is perpendicular to the steam flow direction in the air outlet pipe 2

[0037] Reference Figure 2 and Figure 4 The two flanges 3 are located on both sides of the shell 1. The flanges 3 are coaxially arranged with the cylinder segment 11. One of the flanges 3 is fixed on the end surface of the cylinder segment 11 away from the side plate 12, and the other flange 3 is fixed on the side plate 12 not connected to the cylinder segment 11. A plurality of mounting holes 31 are opened on the end of the flange 3 away from the shell 1, and the plurality of mounting holes 31 are evenly distributed circumferentially along the axis of the flange 3.

[0038] Reference Figure 2 and Figure 4 A number of reinforcing ribs 4 are fixedly provided on the outer wall of the cylinder segment 11. The ribs 4 are evenly distributed circumferentially along the axis of the cylinder segment 11. The ribs 4 are fixedly connected to the side plates 12 and the station plate 13. The two ends of the ribs 4 are respectively fixed on the flange 3. A lifting ear 41 is fixed on the highest point of the reinforcing rib 4 for facilitating the lifting of the shell 1. The lifting ear 41 is provided with an ear hole 42 for the hook to pass through.

[0039] Reference Figure 3 and Figure 4A drainage pipe 5 is fixedly provided on the outer wall of the station board 13 . The drainage pipe 5 is located at the lowest point of the station board 13 . The drainage pipe 5 is L-shaped and communicates with the interior of the station board 13 .

[0040] The implementation principle of a welded volute structure in an embodiment of the present application is as follows: the staff connects the cylinder section 11, two side plates 12 and the station plate 13 by welding, and then welds the two flanges 3 to the cylinder section 11 and the side plates 12 to complete the assembly of the shell 1. After the assembly is completed, the lifting equipment can move the shell 1 to the desired position through the lifting ear 41 and install it through the flange 3.

[0041] When the volute is working, the turbine in the shell 1 drives the steam to enter the worm wheel, and the steam moves along the inner wall of the shell 1 to the air outlet pipe 2. Some steam fails to enter the air outlet pipe 2, but enters the circulation groove 14 through the volute tongue 15. Since the width of the circulation groove 14 gradually increases along the direction of steam flow, the steam has less friction on the inner wall of the circulation groove 14, and the flow loss of the steam is less. In addition, the volute tongue 15 area accounts for a smaller proportion at the air outlet pipe 2, and the proportion entering the air outlet pipe 2 is higher, and the structure is more reasonable.

[0042] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A welded volute structure, characterized in that: The invention comprises a shell (1) and an air outlet pipe (2), wherein the air outlet pipe (2) is arranged on the shell (1), the air outlet pipe (2) is communicated with the interior of the shell (1), a circulation groove (14) for steam flow is provided in the shell (1), a volute tongue (15) is formed between the circulation groove (14) and the air outlet pipe (2), and the width of the circulation groove (14) gradually increases along the steam flow direction until it smoothly transitions to the air outlet pipe (2).

2. A welded volute structure according to claim 1, characterized in that: The shell (1) includes a cylinder section (11), two side plates (12) and a station plate (13), wherein the two side plates (12) are respectively arranged on both sides of the station plate (13), the cylinder section (11) is arranged on one of the side plates (12), and the two side plates (12) and the station plate (13) form the flow groove (14), and the cylinder section (11), the side plates (12) and the station plate (13) are all connected by welding.

3. A welded volute structure according to claim 2, characterized in that: The cylinder section (11), the side plate (12) and the station plate (13) all have the same thickness.

4. The welded volute structure according to claim 1, characterized in that: Both end surfaces of the housing (1) are provided with flanges (3) for connecting equipment.

5. The welded volute structure according to claim 2, characterized in that: The outer side wall of the cylinder section (11) is evenly distributed with a plurality of reinforcing ribs (4).

6. The welded volute structure according to claim 5, characterized in that: The reinforcing rib (4) is provided with a lifting lug (41) for facilitating the lifting of the shell (1).

7. The welded volute structure according to claim 2, characterized in that: The air outlet pipe (2) is in a flared shape, and the side wall of the air outlet pipe (2) is tangent to the station plate (13).

8. The welded volute structure according to claim 1, characterized in that: The air outlet pipe (2) is provided with a water spray hole (22) for flushing water into the shell (1).

9. The welded volute structure according to claim 8, characterized in that: The angle between the water spraying direction of the water spraying hole (22) and the steam flow direction in the circulation groove (14) is 60°-90°.

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