Turbulence-preventing gas volute

Abstract

The utility model relates to the technical field of moving blade gas turbine accessories, and discloses an anti-turbulence gas volute which comprises a volute cavity and a plurality of gas inlet pipe openings evenly and annularly distributed in the volute cavity, and the volute cavity comprises a first volute part and a second volute part. The first volute part is composed of conical cavity walls with the number the same as that of the air inlet pipe openings, a flow guide plate is further fixedly arranged on each conical cavity wall, the multiple conical cavity walls are jointly connected to form the first volute part, flow guide of expansion gas is conducted through the trumpet shapes of the conical cavity walls, and the flow guide effect is good. Turbulence in areas on the two sides of the connecting position of each air inlet pipe opening and a volute cavity is prevented, the influence of turbulence vortex is avoided, meanwhile, a flow guide plate is additionally welded in the volute, and flame tube expansion airflow directly reaches an airflow outlet as much as possible and then reaches a guider. The fluid speed and the working pressure of flame tube expansion gas reaching the guider are improved, and the running power of the gas turbine is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of moving blade combustion engine accessories, in particular to an anti-turbulence combustion gas volute. Background Art

[0002] The volute is an important part of a moving blade engine. Some volutes can converge the gas flames in multiple pipelines and use the converged flames to drive the moving blade engine to work. However, the current volute's inlet pipe and volute part are directly welded through vertical docking. When the expanding gas flows out of the bottleneck section of the volute inlet, the flow beam cross-section suddenly changes, and the gas pressure on both sides of the inlet pipe changes, which in turn produces a suction effect and forms turbulence. Part of the main airflow goes directly to the outlet end and works through the guide device, while part reaches the upper cavity area of ​​the volute, where a fluid vortex phenomenon occurs, forming two recirculation zones on both sides of the inlet. As the flow rate increases, the vortex range of the recirculation zone increases, and greater vibration and noise are generated, resulting in a large part of the gas not being able to directly and quickly reach the volute exhaust end and work through the guide device, affecting the overall power of the moving blade engine. Summary of the Invention

[0003] The utility model aims to provide an anti-turbulence gas volute to solve the problem that turbulence is easily generated in the existing volute when the expanded gas enters the volute from the air inlet.

[0004] The utility model is achieved through the following technical solutions:

[0005] A turbulence-proof gas volute includes a volute cavity and a plurality of air inlet openings evenly distributed on the volute cavity. The volute cavity includes a first volute portion and a second volute portion. The first volute portion is composed of conical cavity walls with the same number as the air inlet openings, and a guide plate is fixedly provided at each of the conical cavity walls.

[0006] In a possible design, the conical cavity wall is trumpet-shaped, and the fixed connection between the air inlet pipe opening and the conical cavity wall is located at the small opening of the trumpet-shaped conical cavity wall.

[0007] The cross-sectional change of the conical cavity is gradually increased. The trumpet shape of the conical cavity is used to guide the expanding gas in the volute cavity to prevent the expanding gas entering the volute from generating turbulence due to the sudden increase in space, which can effectively reduce the energy loss of the expanding gas in the volute cavity.

[0008] In a possible design, a volute cavity is formed between the first volute portion and the second volute portion by welding.

[0009] In a possible design, an annular airflow outlet plate is provided at the center of the volute cavity. The airflow outlet plate is annular and is also used to connect and fix the first volute part and the second volute.

[0010] In a possible design, the air flow outlet plate is provided with the same number of air flow outlets as the air inlet openings, and the positions of the air flow outlets correspond to the positions of the air inlet openings.

[0011] In a possible design, the guide plate includes a main plate and a sub-plate, and a half-section of the main plate is in the same plane as the axis of the air inlet port.

[0012] In a possible design, the sub-plates are symmetrically distributed with the main plate as the center, and the two sub-plates are arranged in an eight-shaped shape, with one end of the eight-shaped small opening close to the air inlet pipe opening.

[0013] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0014] 1. The utility model adopts multiple conical cavity walls to connect together to form a first volute part, and uses the trumpet shape of the conical cavity wall to guide the expanded gas, so as to prevent turbulence from occurring in the areas on both sides of the connection between each air inlet pipe and the volute cavity, and solve the influence of turbulent vortex. At the same time, a guide plate is welded and installed inside the volute, so that the expanded airflow of the flame tube reaches the airflow outlet as directly as possible, and then reaches the guide device. Very little energy loss is generated during the whole process, which increases the fluid velocity and working pressure of the expanded gas in the flame tube reaching the guide device, and improves the operating power of the gas turbine.

[0015] 2. After solving the turbulent flow effect in the volute cavity, the utility model can effectively reduce the vibration and noise of the volute as a whole. At the same time, it can also reduce the damage to the connecting bolts connecting the volute and increase the service life of the connecting bolts. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the accompanying drawings:

[0017] Figure 1 It is a structural diagram of the utility model;

[0018] Figure 2 This is the main view of the utility model;

[0019] Figure 3 For this utility model Figure 2 Cross-sectional view at AA in the middle;

[0020] Figure 4 For this utility model Figure 2 Cross-sectional view at the middle BB.

[0021] The reference numerals represent: 1-inlet pipe opening, 2-conical cavity wall, 3-second volute portion, 4-airflow outlet plate, 401-airflow outlet, 5-guide plate. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The schematic implementation methods of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0023] Examples, such as Figures 1 to 4 As shown, this embodiment includes a volute cavity and a plurality of air inlet pipe openings 1 evenly distributed on the volute cavity, the volute cavity includes a first volute portion and a second volute portion 3, the first volute portion and the second volute portion 3 are welded to form the volute cavity, the expanded airflow flowing in from the plurality of air inlet pipe openings 1 converges and is rectified at the volute cavity and then used to operate the moving blade combustion engine.

[0024] In this embodiment, each of the air inlet pipe openings 1 is smoothly connected to the volute cavity through a conical cavity wall 2. The first volute part is composed of the same number of conical cavity walls 2 as the air inlet pipe openings 1. The conical cavity wall 2 is trumpet-shaped. The fixed connection between the air inlet pipe opening 1 and the conical cavity wall 2 is located at the small mouth of the trumpet-shaped conical cavity wall 2. The expanded gas flowing in from the air inlet pipe opening 1 can form a good diversion effect through the conical cavity wall 2, thereby greatly reducing the turbulence of the expanded airflow entering the volute cavity in the volute cavity, effectively reducing energy loss, improving the energy conversion efficiency of the moving blade combustion engine, and greatly reducing the vibration and noise caused by turbulence.

[0025] It should be noted that the volute as a whole is generally installed and fixed to the moving blade engine with bolts. When the vibration of the volute as a whole is greatly reduced, the vibration impact on the connecting bolts connecting the volute is also significantly reduced, which can effectively reduce the damage to the connecting bolts, extend the service life of the connecting bolts, and prevent the occurrence of connecting bolt breakage accidents.

[0026] In this embodiment, an annular airflow outlet plate 4 is provided at the center position of the volute cavity. The airflow outlet plate 4 is annular and is also used to connect and fix the first volute part and the second volute part 3. The airflow outlet plate 4 is provided with the same number of airflow outlets 401 as the air inlet pipe opening 1. The position of the airflow outlet 401 corresponds to the position of the air inlet pipe opening 1. Specifically, the center position of the airflow outlet 401 and the axis of the corresponding air inlet pipe opening 1 are located on the same plane. After the position of the airflow outlet 401 corresponds to the position of the air inlet pipe opening 1, the energy loss of the expanded gas entering from the pipe opening can be effectively reduced.

[0027] Furthermore, a guide plate 5 is fixedly provided on the inner side of each of the conical cavity walls 2, and the guide plate 5 includes a main plate and a sub-plate. The conical cavity wall is divided into multiple fluid channels by multiple guide plates 5, and the half-section of the main plate is in the same plane as the axis of the air inlet pipe port 1. The main plate can directly introduce most of the expanded gas entering from the air inlet pipe port 1 into the air flow outlet 401, which can effectively prevent the energy loss of the expanded gas in the volute cavity. The sub-plates are symmetrically distributed with the main plate as the center, and the shape between the two sub-plates is an eight-shaped shape, and one end of the eight-shaped small opening is close to the air inlet pipe port 1. The two sub-plates can also further prevent the expanded gas entering the air inlet pipe port 1 from diffusing toward other conical cavity walls 2, and can directly introduce more expanded gas from the air inlet pipe port 1 into the air flow outlet 401, reducing energy loss. At the same time, the design of the guide plate 5 can also effectively prevent the occurrence of turbulence in the volute cavity.

[0028] It should be noted that the first volute portion in this embodiment can be directly formed by directly welding multiple conical cavity walls 2, while in the traditional volute cavity, the first volute portion and the second volute portion 3 need to be formed by model pressing, which has higher processing and procurement costs. In this embodiment, the part that needs to be pressed in manufacturing the volute cavity is only the second volute portion 3, and the workload of the pressing part is greatly reduced, which can further reduce the production and manufacturing costs.

[0029] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific implementation method of the utility model and is not intended to limit the scope of protection of the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. A turbulent gas volute, comprising a volute cavity and a plurality of air inlet openings (1) uniformly distributed on the volute cavity, characterized in that: The volute cavity comprises a first volute portion and a second volute portion (3); The first volute portion is composed of the same number of conical cavity walls (2) as the number of the air inlet openings (1); A guide plate (5) is also fixedly provided on each of the conical cavity walls (2).

2. The anti-turbulence gas volute according to claim 1, characterized in that: The conical cavity wall (2) is trumpet-shaped, and the fixed connection between the air inlet pipe opening (1) and the conical cavity wall (2) is located at the small opening of the conical cavity wall (2).

3. The anti-turbulence gas volute according to claim 1, characterized in that: A volute cavity is formed between the first volute portion and the second volute portion (3) by welding.

4. The anti-turbulence gas volute according to claim 1, characterized in that: An annular airflow outlet plate (4) is provided at the center of the volute cavity. The airflow outlet plate (4) is annular and is also used to connect and fix the first volute part and the second volute part (3).

5. The anti-turbulence gas volute according to claim 4, characterized in that: The airflow outlet plate (4) is provided with the same number of airflow outlets (401) as the air inlet openings (1), and the positions of the airflow outlets (401) correspond to the positions of the air inlet openings (1).

6. The anti-turbulence gas volute according to claim 1, characterized in that: The guide plate (5) comprises a main plate and a sub-plate, and a half-section of the main plate is in the same plane as the axis of the air inlet port (1).

7. The anti-turbulence gas volute according to claim 6, characterized in that: The auxiliary plates are symmetrically distributed with the main plate as the center, and the two auxiliary plates are arranged in an eight-shaped shape, with one end of the eight-shaped small opening close to the air inlet pipe opening (1).

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