A steam inlet chamber structure for balancing pipeline thrust and preventing turbulence diffusion

Abstract

This invention discloses a steam inlet chamber structure for balancing pipeline thrust and preventing turbulence diffusion, relating to the field of steam turbine technology. It includes a steam inlet, a flow-guiding transition expansion section, an annular chamber, a steam outlet, and a turbulence-prevention structure. The steam inlet is connected to the annular chamber via the flow-guiding transition expansion section, the cross-sectional area of ​​which gradually increases according to the medium flow direction. The steam outlet corresponds to the medium outlet of the annular chamber. This steam inlet chamber structure effectively improves the uniformity of steam flow, alleviates sudden changes in steam velocity, effectively reduces steam mixing and horizontal interference, and effectively improves the stability of the flow field. Simultaneously, it effectively balances the horizontal thrust of the turbine cylinder, simplifies the cylinder disassembly and maintenance process, shortens maintenance time, and effectively improves the economic performance, stability, and safety of industrial steam turbines.

Description

Technical Field

[0001] This invention relates to the field of steam turbine technology, and more specifically to the field of steam inlet chamber structure technology for balancing pipeline thrust and preventing turbulence diffusion. Background Technology

[0002] With the continuous improvement of industrial manufacturing technology, the domestic steam turbine market has been expanding in recent years. Taking industrial steam turbines as an example, the domestic market has increased by 15 percentage points year-on-year. Furthermore, with the rapid development of steam turbine technology, the application scenarios of steam turbines are also constantly expanding. As an industrial technology in the downstream application market, industrial steam turbines are important driving rotating power equipment in fields such as industrial production, ship power, and oil processing. Compared with traditional large-scale power generation steam turbines, industrial steam turbines have advantages such as a wide range of power applications and a compact structure.

[0003] However, due to the limitations of the overall structure of industrial steam turbines, the steam flow within the turbine chamber undergoes significant detours, resulting in noticeable mutual collisions and mixing of steam flows. This affects the uniformity of steam flow within the inlet chamber and the stability of the turbine cylinder, easily leading to substantial energy losses and thus impacting the economic efficiency of the turbine unit. The relatively lightweight structure of industrial steam turbines, coupled with the high-speed steam flow entering the chamber, can cause uneven horizontal stress on the turbine cylinder, increasing wear between moving and stationary components. This can lead to cylinder instability. Furthermore, the variable and unstable operating environment of industrial steam turbines can result in performance degradation and frequent malfunctions, often requiring periodic cylinder maintenance. However, the complex piping system connecting the outer cylinder makes maintenance procedures cumbersome and time-consuming. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned technical problems concerning the structure of the steam inlet chamber of industrial steam turbines. This invention provides a steam inlet chamber structure that balances pipeline thrust and prevents turbulence diffusion, thereby improving the economy, stability, and safety of industrial steam turbine units.

[0005] This invention provides a steam inlet chamber structure for balancing pipeline thrust and preventing turbulence diffusion, including a steam inlet, a flow guiding transition expansion section, an annular chamber, a steam outlet, and a turbulence prevention structure. The steam inlet is connected to the annular chamber through the flow guiding transition expansion section. The cross-sectional area of ​​the flow guiding transition expansion section gradually increases according to the medium flow direction. The steam outlet corresponds to the medium outlet of the annular chamber.

[0006] Specifically, the steam inlet chamber structure can effectively improve the uniformity of steam flow, alleviate sudden changes in steam velocity, effectively reduce mutual mixing and horizontal collision of steam flow, and effectively improve the stability of the flow field. At the same time, it can effectively balance the horizontal thrust of the turbine cylinder, simplify the process of cylinder disassembly and maintenance, shorten the maintenance time, and effectively improve the economic performance, stability and safety of industrial steam turbines.

[0007] The steam inlet chamber consists of five parts: the steam inlet, the flow guiding transition expansion section, the annular chamber, the steam outlet, and the anti-turbulence structure. The steam inlet is connected to the annular chamber through the annular flow guiding transition expansion section.

[0008] In one embodiment, the steam inlet includes a left steam inlet and a right steam inlet arranged symmetrically from left to right;

[0009] The flow guiding transition expansion section includes a left flow guiding transition expansion section and a right flow guiding transition expansion section arranged symmetrically on the left and right sides;

[0010] The annular chamber includes a left chamber and a right chamber that are symmetrically distributed from left to right. At the connection between the upper and lower positions of the left chamber and the right chamber, anti-turbulence structures are provided to mitigate the horizontal opposition, torsion and mutual mixing of the steam flow.

[0011] The left steam inlet is connected to the left chamber through the left guide transition expansion section, and the right steam inlet is connected to the right chamber through the right guide transition expansion section.

[0012] Specifically, this design features two symmetrical steam inlets (left and right), two symmetrical guide transition expansion sections (left and right), an annular chamber (left and right), two anti-turbulence structures, and an annular steam outlet. The two steam inlets are symmetrically distributed and located in the lower half of the inlet chamber. Connected to the steam inlets are circumferentially diffusing guide transition expansion sections. Anti-turbulence structures are installed at the top and bottom of the annular chamber to guide the fluid to flow uniformly in the circumferential direction. Anti-turbulence structures are also installed at the top and bottom of the annular chamber, dividing it into two chambers (left and right) to mitigate horizontal collisions, twisting, and mixing of the steam flow, thereby improving the economic performance of the inlet chamber. Finally, the steam flow is discharged into the downstream flow stage through the steam outlet.

[0013] In one embodiment, both the left guide transition expansion section and the right guide transition expansion section are smooth annular expansion type steam inlet channels. The flow channel curve of the left guide transition expansion section extends to the middle of the left chamber, and the flow channel curve of the right guide transition expansion section extends to the middle of the right chamber.

[0014] Specifically, by setting up a horizontally symmetrical two-pipe steam inlet in the lower half of the cylinder, the circumferential uniformity of the steam flow is increased.

[0015] In one embodiment, both the left steam inlet and the right steam inlet are cylindrical steam inlet structures, and both the left steam inlet and the right steam inlet are horizontally and symmetrically arranged on the left and right sides of the annular chamber, which is arranged horizontally and longitudinally.

[0016] Specifically, by setting a guide transition expansion section at the steam inlet channel, the steam flow is guided from the horizontal direction to the tangential direction, reducing sudden changes in steam flow velocity. The two steam inlets are set in a horizontally symmetrical manner, which can effectively balance the horizontal thrust of the cylinder and maximize the stability of the turbine cylinder. Both steam inlets are set in the lower half of the turbine cylinder, which minimizes the operator's maintenance process, shortens maintenance time, and improves the overall performance of the turbine unit.

[0017] In one embodiment, the cross-sections of the left chamber and the right chamber gradually decrease from the side away from the steam outlet to the side closer to the steam outlet.

[0018] Specifically, the cross-section of the annular chamber is designed with a certain tilt angle to reduce local vortex flow and facilitate steam flow guidance.

[0019] In one embodiment, the steam outlet is tubular in shape, the axis of the annular chamber coincides with the axis of the steam outlet, one side of the inner ring of the annular chamber is connected to the steam outlet, and an annular medium channel is provided on the inner side of the annular chamber near the steam outlet.

[0020] In one embodiment, the left flow transition expansion section and the left chamber have a smooth transition, and the right flow transition expansion section and the right chamber have a smooth transition.

[0021] In one embodiment, the overall contour curve of the steam inlet chamber structure includes the outer contour curve A1 of the steam outlet, the upper half of the outer contour curve B2 of the annular chamber, the outer contour curve C3 of the guide transition expansion section, and the lower half of the guide transition expansion section curve D4. The four curves A1, B2, C3, and D4 are parametrically controlled, and the curvature of the entire chamber curve is continuous and uniform.

[0022] In one embodiment, curve A1 is defined as the outer contour circular curve of the steam outlet with its center located at the origin and its radius of curvature being R1.

[0023] Curve B2 controls the outer contour curve of the upper half of the intake chamber cylinder. Curve B2 forms an angle with the vertical direction of the top anti-turbulence structure. The arcs R2 and R3 together control the angle. It mainly controls the degree of tapering at the top of the annular chamber;

[0024] angle The value is The center of arc R3 is at the same horizontal position as the origin, and is horizontally offset from the center position X1. The center of arc R2 is higher than the origin, and is horizontally offset from the center position X2.

[0025] The relationship between the horizontal position X2 of the center of arc R2 and the horizontal position X1 of the center of arc R3 is as follows:

[0026] X2 = a × X1, where the value of a ranges from 1.8 to 2.5;

[0027] Curve C3 controls the outer contour arc curve of the guide transition expansion section. Curve C3 is jointly controlled by arcs R4 and R5. Arcs R4 and R3 are vertically tangent. The center of arc R5 is located in the radial direction at the inlet position of the guide transition expansion section. The relationship between the horizontal position X4 of arc R5 and the horizontal position X1 of the center of arc R3 is as follows:

[0028] ,in, The value range is 9.5 to 11.4;

[0029] Curve D4 is the curve in the lower half of the flow control transition expansion section. Curve D4 is mainly composed of curves that form an angle with the vertical direction of the top anti-disturbance structure. The radius R6 is controlled by the angle. The main control is the degree and angle of contraction at the bottom of the guide transition expansion section. The value of β is 45°≤β<90°;

[0030] The relationship between the horizontal position X3 of the center of arc R6 and the horizontal position X4 of the center of arc R5 is as follows:

[0031] ,in, The value range is 0.5 to 0.95.

[0032] Specifically, see Figure 3 The radii R1, R2, R3, R4, R5, and R6 of each arc segment are determined according to the actual situation of the unit.

[0033] In one embodiment, the anti-turbulence structure is distributed along the axial direction of the annular chamber, and its axial dimension is consistent with the axial dimension of the top and bottom of the annular chamber. By controlling the thickness S of the anti-turbulence structure, the speed of the steam flow is controlled, the degree of abrupt change in speed is reduced, and the horizontal mutual collision and mixing of the steam flows is alleviated.

[0034] See Figure 4 As shown, Figure 1 The view along direction AA, i.e., the cross-sectional schematic diagram of the annular chamber, shows that the cross-section of the annular chamber consists of straight line segments of lengths L1 and L2, which are perpendicularly distributed at a 90° angle to the centerline of the axial direction. The straight line segment and the smoothly transitioned rounded surfaces R7, R8, and R9 together constitute the structure, where L1 and... Figure 3 The diameter L of the steam inlet is related to the straight segment L2 and... Figure 3 The relationship between the radii R2 and R3 of the middle circular arc is: L2 = R3 - R2, which is achieved by setting the cross-section of the annular chamber to have a certain inclination angle. form, tilt angle The recommended value range is 40°~70°, so that the steam flow is distributed as evenly as possible throughout the annular chamber, reducing local vortex flow and guiding the steam flow into the steam outlet.

[0035] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0036] The beneficial effects of this invention are as follows:

[0037] 1. This structure, with its small volume and compact design, effectively guides steam flow into the steam inlet chamber, reduces sudden changes in steam flow velocity, alleviates mutual collision and mixing of steam flow within the steam inlet chamber, reduces local flow separation, and improves the uniformity and stability of steam flow within the steam inlet chamber. Simultaneously, this steam inlet design increases the stability of the industrial turbine cylinder, effectively balances the horizontal thrust of the turbine cylinder, simplifies the operator's cylinder disassembly and maintenance procedures, shortens maintenance time, and improves the overall performance and safety of the turbine.

[0038] 2. By setting a flow-guiding transition expansion section between the inlet section and the annular chamber, the steam flow velocity direction is guided from horizontal to tangential, guiding the steam flow to enter uniformly and mitigating sudden changes in steam flow velocity. By setting anti-turbulence structures at the top and root positions of the upper and lower cylinders, horizontal mutual collision and mixing of steam flows are avoided. When the steam flows in the annular chamber, the steam flow cannot be completely distributed at every point in the chamber. By setting the annular chamber with a certain tilt angle, local steam flow vortices are reduced and the steam flow is guided to exit, improving the uniformity and stability of the flow field in the chamber, reducing flow losses, and improving the efficiency of the steam inlet chamber.

[0039] 3. The steam flow enters the annular chamber symmetrically from left to right along the two steam inlets, guiding the steam flow to enter horizontally and symmetrically, so that the steam turbine cylinder is subjected to uniform horizontal force, effectively balancing the horizontal thrust on the left and right sides, making the industrial steam turbine cylinder more stable, and increasing the reliability and safety of the steam turbine unit.

[0040] 4. There are many pipes connected to the outside of the turbine cylinder. If both the upper and lower cylinders are disassembled, the process is cumbersome and complicated, the maintenance time is long, and it will affect the operation of the unit. By setting both steam inlets in the lower cylinder of the steam inlet chamber, only the upper cylinder needs to be opened during maintenance, which helps to simplify the maintenance procedure and improve work efficiency. Attached Figure Description

[0041] Figure 1 This is a front view of the structure of the present invention;

[0042] Figure 2 This is a top view of the structure of the present invention;

[0043] Figure 3 This is a partial dimensional schematic diagram of the structure of the present invention;

[0044] Figure 4 Figure 1 A schematic diagram of the transverse cross-section of the annular chamber at point AA;

[0045] Reference numerals: 1-Steam inlet, 2-Guiding transition expansion section, 3-Annular chamber, 4-Steam outlet, 5-Anti-turbulence structure. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0048] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0049] In the description of the embodiments of the present invention, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0050] Example 1

[0051] like Figures 1 to 2As shown in the figure, this embodiment provides a steam inlet chamber structure for balancing pipeline thrust and preventing turbulence diffusion, including a steam inlet 1, a flow guiding transition expansion section 2, an annular chamber 3, a steam outlet 4, and a turbulence prevention structure 5. The steam inlet 1 is connected to the annular chamber 3 through the flow guiding transition expansion section 2. The cross-sectional area of ​​the flow guiding transition expansion section 2 gradually increases according to the medium flow direction. The steam outlet 4 corresponds to the medium outlet of the annular chamber 3.

[0052] Specifically, the steam inlet chamber structure can effectively improve the uniformity of steam flow, alleviate sudden changes in steam velocity, effectively reduce mutual mixing and horizontal collision of steam flow, and effectively improve the stability of the flow field. At the same time, it can effectively balance the horizontal thrust of the turbine cylinder, simplify the process of cylinder disassembly and maintenance, shorten the maintenance time, and effectively improve the economic performance, stability and safety of industrial steam turbines.

[0053] The steam inlet chamber consists of five parts: steam inlet 1, flow guiding transition expansion section 2, annular chamber 3, steam outlet 4, and anti-turbulence structure 5. The steam inlet 1 is connected to the annular chamber 3 through the annular flow guiding transition expansion section 2.

[0054] Example 2

[0055] This embodiment is a further optimization based on Embodiment 1, specifically:

[0056] Steam inlet 1 includes a left steam inlet and a right steam inlet arranged symmetrically on the left and right sides;

[0057] The flow guiding transition expansion section 2 includes a left flow guiding transition expansion section and a right flow guiding transition expansion section arranged symmetrically on the left and right sides;

[0058] The annular chamber 3 includes a left chamber and a right chamber that are symmetrically distributed on the left and right sides. At the connection between the upper and lower positions of the left and right chambers, anti-turbulence structures 5 are provided to mitigate the horizontal opposition, torsion and mutual mixing of the steam flow.

[0059] The left steam inlet is connected to the left chamber through the left guide flow transition expansion section, and the right steam inlet is connected to the right chamber through the right guide flow transition expansion section.

[0060] Specifically, this scheme consists of two symmetrical steam inlets 1 (left and right steam inlets), two symmetrical guide transition expansion sections 2 (left and right guide transition expansion sections), one annular chamber 3 (left and right chambers), two anti-turbulence structures 5, and one annular steam outlet 4. The two steam inlets 1 are symmetrically distributed and located in the lower half of the steam inlet chamber. Connected to the steam inlets 1 is the circumferentially diffusing guide transition expansion section 2. Anti-turbulence structures 5 are set at the top and bottom of the annular chamber 3 to guide the fluid to flow uniformly in the circumferential direction. Anti-turbulence structures 5 are also set at the top and bottom of the annular chamber 3 to divide the annular chamber 3 into two chambers (i.e., the left and right chambers), which alleviates the horizontal collision, torsion, and mixing of the steam flow, improves the economic performance of the steam inlet chamber, and finally the steam flow is discharged into the downstream flow stage through the steam outlet 4.

[0061] Example 3

[0062] This embodiment is a further optimization based on embodiment 2, specifically:

[0063] Both the left and right guide transition expansion sections are smooth annular expansion type steam inlet channels. The flow curve of the left guide transition expansion section extends to the middle of the left chamber, and the flow curve of the right guide transition expansion section extends to the middle of the right chamber.

[0064] Specifically, by setting up a horizontally symmetrical two-pipe steam inlet in the lower half of the cylinder, the circumferential uniformity of the steam flow is increased.

[0065] Both the left and right steam inlets are cylindrical steam inlet structures, and are arranged horizontally and symmetrically on the left and right sides of the annular chamber 3, which is arranged horizontally and longitudinally.

[0066] Specifically, by setting a guide transition expansion section 2 at the steam inlet channel, the steam flow is guided from the horizontal direction to the tangential direction, reducing the sudden change in steam flow velocity; the two steam inlets 1 are set in a horizontally symmetrical steam inlet form, which can effectively balance the horizontal thrust of the cylinder and maximize the stability of the turbine cylinder. Both steam inlets 1 are set in the lower half of the turbine cylinder, which minimizes the operator's maintenance process, shortens maintenance time, and improves the overall performance of the turbine unit.

[0067] The cross-sections of the left and right chambers gradually decrease from the side furthest from the steam outlet 4 to the side closest to the steam outlet 4.

[0068] Specifically, the cross-section of the annular chamber 3 is designed with a certain tilt angle to reduce local vortex flow and facilitate steam flow guidance.

[0069] The steam outlet 4 is tubular in shape. The axis of the annular chamber 3 coincides with the axis of the steam outlet 4. One side of the inner ring of the annular chamber 3 is connected to the steam outlet 4. An annular medium channel is provided on the inner side of the annular chamber 3 near the steam outlet 4.

[0070] The left diversion transition expansion segment and the left chamber have a smooth transition, as do the right diversion transition expansion segment and the right chamber.

[0071] Example 4

[0072] This embodiment is a further optimization based on embodiment 3, specifically:

[0073] The overall contour curve of the steam inlet chamber structure includes the outer contour curve A1 of the steam outlet, the upper half of the outer contour curve B2 of the annular chamber, the outer contour curve C3 of the guide transition expansion section, and the lower half of the guide transition expansion section curve D4. The four curves A1, B2, C3, and D4 are parametrically controlled, and the curvature of the entire chamber curve is continuous and uniform.

[0074] The curve A1 is set to be the outer contour circle of the steam outlet, with its center located at the origin and its radius of curvature R1.

[0075] Curve B2 controls the outer contour curve of the upper half of the intake chamber cylinder. Curve B2 forms an angle with the vertical direction of the top anti-turbulence structure. The arcs R2 and R3 together control the angle. The main function is to control the degree of contraction at the top of the annular chamber.

[0076] angle The value is The center of arc R3 is at the same horizontal position as the origin, and is horizontally offset from the center position X1. The center of arc R2 is higher than the origin, and is horizontally offset from the center position X2.

[0077] The relationship between the horizontal position X2 of the center of arc R2 and the horizontal position X1 of the center of arc R3 is as follows:

[0078] X2 = a × X1, where the value of a ranges from 1.8 to 2.5;

[0079] Curve C3 controls the outer contour arc curve of the guide transition expansion section. Curve C3 is jointly controlled by arcs R4 and R5. Arcs R4 and R3 are vertically tangent. The center of arc R5 is located in the radial direction at the inlet position of the guide transition expansion section. The relationship between the horizontal position X4 of arc R5 and the horizontal position X1 of the center of arc R3 is as follows:

[0080] ,in, The value range is 9.5 to 11.4;

[0081] Curve D4 is the curve of the lower half of the flow-guiding transition expansion section 2. Curve D4 is mainly formed at an angle to the vertical direction of the top anti-disturbance structure 5. The radius R6 is controlled by the angle. The main control is the degree and angle of the tapering at the bottom of the flow guide transition expansion section 2. The value of β is 45°≤β<90°;

[0082] The relationship between the horizontal position X3 of the center of arc R6 and the horizontal position X4 of the center of arc R5 is as follows:

[0083] ,in, The value range is 0.5 to 0.95.

[0084] Specifically, see Figure 3 The radii R1, R2, R3, R4, R5, and R6 of each arc segment are determined according to the actual situation of the unit.

[0085] The anti-turbulence structure is distributed along the axial direction of the annular chamber, and its axial dimension is consistent with the axial dimension of the top and bottom of the annular chamber. By controlling the thickness S of the anti-turbulence structure, the speed of the steam flow is controlled, the degree of abrupt change in speed is reduced, and the horizontal mutual collision and mixing of the steam flows is alleviated.

[0086] See Figure 4 As shown, Figure 1 The view along direction AA, i.e., the cross-sectional schematic diagram of the annular chamber, shows that the cross-section of the annular chamber consists of straight line segments of lengths L1 and L2, which are perpendicularly distributed at a 90° angle to the centerline of the axial direction. The straight line segment and the smoothly transitioned rounded surfaces R7, R8, and R9 together constitute the structure, where L1 and... Figure 3 The diameter L of the steam inlet is related to the straight segment L2 and... Figure 3 The relationship between the radii R2 and R3 of the middle circular arc is: L2 = R3 - R2, which is achieved by setting the cross-section of the annular chamber to have a certain inclination angle. form, tilt angle The recommended value range is 40°~70°, so that the steam flow is distributed as evenly as possible throughout the annular chamber, reducing local vortex flow and guiding the steam flow into the steam outlet.

Claims

1. A steam inlet chamber structure for balancing pipeline thrust and preventing turbulence diffusion, characterized in that, It includes a steam inlet (1), a flow guiding transition expansion section (2), an annular chamber (3), a steam outlet (4), and a flow prevention structure (5). The steam inlet (1) is connected to the annular chamber (3) through the flow guiding transition expansion section (2). The cross-sectional area of ​​the flow guiding transition expansion section (2) gradually increases according to the flow direction of the medium. The steam outlet (4) corresponds to the medium outlet of the annular chamber (3). The steam inlet (1) includes a left steam inlet and a right steam inlet arranged symmetrically on the left and right sides; The flow guiding transition expansion section (2) includes a left flow guiding transition expansion section and a right flow guiding transition expansion section arranged symmetrically on the left and right sides; The annular chamber (3) includes a left chamber and a right chamber that are symmetrically distributed on the left and right sides. At the connection between the upper and lower positions of the left chamber and the right chamber, an anti-turbulence structure (5) is provided to alleviate the horizontal collision, torsion and mutual mixing of the steam flow. The left steam inlet is connected to the left chamber through the left guide transition expansion section, and the right steam inlet is connected to the right chamber through the right guide transition expansion section; The overall contour curve of the steam inlet chamber structure includes the outer contour curve A1 of the steam outlet (4), the upper half of the outer contour curve B2 of the annular chamber (3), the outer contour curve C3 of the guide transition expansion section (2), and the lower half of the guide transition expansion section (2) curve D4. The four curves A1, B2, C3, and D4 are parametrically controlled, and the curvature of the entire chamber curve is continuous and uniform. The curve A1 is set to be the outer contour circle of the steam outlet (4) with its center located at the origin and its radius of curvature R1. The curve B2 controls the outer contour curve of the upper half of the intake chamber. Curve B2 forms an angle with the vertical direction of the top anti-turbulence structure (5). The arcs R2 and R3 together control the angle. The main control is the degree of tapering at the top of the annular chamber (3); angle The value is The center of arc R3 is at the same horizontal position as the origin, and is horizontally offset from the center position X1. The center of arc R2 is higher than the origin, and is horizontally offset from the center position X2. The relationship between the horizontal position X2 of the center of arc R2 and the horizontal position X1 of the center of arc R3 is as follows: X2 = a × X1, where the value of a ranges from 1.8 to 2.

5.

2. The steam inlet chamber structure for balancing pipeline thrust and preventing turbulence diffusion according to claim 1, characterized in that, Both the left and right guide transition expansion sections are smooth annular expansion type steam inlet channels. The flow curve of the left guide transition expansion section extends to the middle of the left chamber, and the flow curve of the right guide transition expansion section extends to the middle of the right chamber.

3. The steam inlet chamber structure for balancing pipeline thrust and preventing turbulence diffusion according to claim 1, characterized in that, Both the left and right steam inlets are cylindrical steam inlet structures, and both the left and right steam inlets are horizontally and symmetrically arranged on the left and right sides of the annular chamber (3), which is arranged horizontally and longitudinally.

4. The steam inlet chamber structure for balancing pipeline thrust and preventing turbulence diffusion according to claim 1, characterized in that, The cross-sections of the left chamber and the right chamber gradually decrease from the side away from the steam outlet (4) to the side closer to the steam outlet (4).

5. The steam inlet chamber structure for balancing pipeline thrust and preventing turbulence diffusion according to claim 1, characterized in that, The steam outlet (4) is tubular in shape. The axis of the annular chamber (3) coincides with the axis of the steam outlet (4). One side of the inner ring of the annular chamber (3) is connected to the steam outlet (4). An annular medium channel is provided on the inner side of the annular chamber (3) near the steam outlet (4).

6. The steam inlet chamber structure for balancing pipeline thrust and preventing turbulence diffusion according to claim 1, characterized in that, The left guide transition expansion section and the left chamber have a smooth transition, and the right guide transition expansion section and the right chamber have a smooth transition.

7. The steam inlet chamber structure for balancing pipeline thrust and preventing turbulence diffusion according to claim 1, characterized in that, Curve C3 controls the outer contour arc curve of the guide transition expansion section (2). Curve C3 is jointly controlled by arcs R4 and R5. Arcs R4 and R3 are vertically tangent. The center of arc R5 is located in the radial direction of the inlet position of the guide transition expansion section (2). The relationship between the horizontal position X4 of arc R5 and the horizontal position X1 of the center of arc R3 is as follows: ,in, The value range is 9.5 to 11.4; Curve D4 is the lower half of the flow-guiding transition expansion section (2). Curve D4 is mainly formed by the vertical direction of the top anti-disturbance structure (5) at an angle. The radius R6 is controlled by the angle. The main control is the degree of contraction and angle at the bottom of the flow-guiding transition expansion section (2). The value of β is 45°≤β<90°; The relationship between the horizontal position X3 of the center of arc R6 and the horizontal position X4 of the center of arc R5 is as follows: ,in, The value range is 0.5 to 0.

95.

8. The steam inlet chamber structure for balancing pipeline thrust and preventing turbulence diffusion according to claim 7, characterized in that, The anti-turbulence structure (5) is distributed along the axial direction of the annular chamber (3), and its axial dimension is consistent with the axial dimension of the top and bottom of the annular chamber (3). By controlling the thickness S of the anti-turbulence structure (5), the speed of the steam flow is controlled.

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