Through-flow blade structure of steam turbine

Abstract

The utility model discloses a through-flow blade structure of a steam turbine, which comprises a blade root and a through-flow blade arranged at the end part of the blade root and used for cooling the flow guide of the blade, and the through-flow blade is internally provided with a through-flow cavity for enabling air flow to enter to uniformly dissipate heat of the through-flow blade. Through-flow vertical plates are arranged in the through-flow cavities, and then air flow dispersing holes in the through-flow vertical plates are combined for use, so that air flow on the through-flow blades enters the through-flow cavities and then is shunted through the air flow dispersing holes under the state that the through-flow blades are combined to rotate; the air pressure value of the airflow is dispersed and reduced, the airflow smoothly circulates in the through-flow blades to achieve the effect of cooling the blades, and the through-flow blades are reinforced through the through-flow vertical plates, so that the impact of the airflow on the rotation of the through-flow blades can be reduced, and the deformation phenomenon caused by large airflow impact force and unsmooth through-flow is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of steam turbine blades, and in particular relates to a through-flow blade structure of a steam turbine. Background Art

[0002] A steam turbine is a rotary power machine that converts steam energy into mechanical work. It is also called a steam turbine. It is mainly used as a prime mover for power generation. It can also directly drive various pumps, fans, compressors and ship propellers. The exhaust steam or intermediate extraction steam of the steam turbine can also be used to meet the heating needs of production and life. The turbine blades work under the action of high-temperature and high-pressure steam, and are subjected to high-intensity water droplet erosion during operation. The working environment is often in a humid state. If the corrosion resistance of the turbine blades does not meet the requirements, the service life of the turbine blades will be greatly shortened.

[0003] To this end, a steam turbine blade with the announcement number "CN210141157U" includes a blade root, a blade body and a blade crown, and the blade root, blade body and blade crown are fixedly connected in sequence. The blade body includes an inner arc surface and an outer arc surface, and the inner arc surface is provided with multiple grooves, and the grooves are semicircular grooves; the steam turbine blade can not only improve the utilization rate of water vapor, but also has strong anti-corrosion performance.

[0004] However, for the above-mentioned turbine blades, although the bottom of the semicircular groove on the side of the air inlet groove close to the semicircular groove is flush, the set air inlet groove can allow water vapor to enter the semicircular groove more smoothly along the air inlet groove, thereby completing the obstruction of water vapor to a large extent and improving the utilization rate of water vapor, the following more obvious defects still exist during use: the aperture of the air inlet groove of the above-mentioned turbine blade is small, and during the rotation of the turbine blade, the airflow will be poor due to the large pressure of the flowing airflow, and the blade will be deformed under the impact of a large airflow. Utility Model Content

[0005] The purpose of the present utility model is to provide a flow blade structure of a steam turbine to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a flow blade structure of a steam turbine, comprising a blade root, and a flow blade at the end of the blade root for guiding and cooling the blade; a flow cavity is provided inside the flow blade for allowing airflow to enter and uniformly dissipating heat from the flow blade; a blade plate is provided at the top inner side of the flow cavity for sealing the flow cavity and allowing airflow to flow in and effectively dissipate heat; an air inlet hole is vertically and evenly provided on one side of the front end face of the flow blade for communicating with the flow cavity and allowing airflow to enter; air outlet holes are vertically and equidistantly provided at the outer front end of the flow blade; and reinforcing flow vertical plates are evenly and vertically provided inside the flow cavity for internally reinforcing support for the high-speed rotation of the flow blade.

[0007] Preferably, a blade sliding mounting block for assembling the through-flow blades and mounting them on the steam turbine is provided at the bottom of the blade root, so that the through-flow blades are sequentially mounted on the rotating main shaft of the steam turbine to convert mechanical energy.

[0008] Preferably, the air inlet hole is connected to the flow cavity, and the air inlet hole is inclinedly arranged on the flow blade to facilitate the entry of airflow, so that during the rotation of the flow blade, the airflow can quickly enter the interior of the flow blade by guiding the flow.

[0009] Preferably, the surface of the enhanced flow vertical plate is evenly penetrated with dispersed airflow holes that allow the air entering the flow cavity to flow to the entire flow blade to cool down and reduce resistance. Adding the flow vertical plate can make the flow blade more stable and firm during rotation.

[0010] Preferably, the surface of the blade is evenly provided with top airflow holes, and the blade is fixed to the top of the flow cavity by welding, which allows the airflow to flow more smoothly in the flow blade to effectively cool its body and generate driving force.

[0011] Preferably, the front end surface of the through-flow blade is evenly and laterally provided with guide strips for guiding the airflow. The guide strip is triangular and a diversion channel is opened on the surface at a corner, so that the rotating through-flow blade can introduce the airflow into the interior of the through-flow blade.

[0012] Compared with the existing technology, the technical effects and advantages of the utility model are as follows: the flow blade structure of the steam turbine, through the flow cavity in the flow blade, and the strengthening of the flow vertical plate in the flow cavity, and then the strengthening of the dispersed airflow holes on the flow vertical plate, makes the blade flow blade combination rotate. After the airflow on the flow blade enters the flow cavity, it is diverted by the dispersed airflow holes, so that the air pressure value of the airflow is dispersed and reduced, and it flows smoothly inside the flow blade to cool the blade. In addition, by strengthening the flow vertical plate on the flow blade, the impact of the airflow on the rotation of the flow blade can be reduced, avoiding the deformation caused by the large impact force of the airflow and poor flow.

[0013] Through the cooperation between the air inlet holes, top air outlet holes, guide strips and flow chambers set on the surface of the flow blades, the flow blades are rotated, and the guide channels formed on the flow blades by the guide strips can guide the airflow into the inclined air inlet holes, so that the airflow can flow into the flow chamber and circulate throughout the entire flow blades, thereby realizing the overall flow cooling and heat dissipation effect of the external airflow on the rotating flow blades, avoiding the problem of deformation of the flow blades caused by excessive temperature, and the airflow flowing in the flow chamber is discharged from the air outlet holes, so that the airflow has a certain fluidity in the flow blades, ensuring that the airflow with higher pressure will not cause damage to the flow blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the utility model;

[0015] Figure 2 This is a schematic diagram of the top view of the structure of the utility model;

[0016] Figure 3 This is a side view structural diagram of the utility model's enhanced flow-through vertical plate;

[0017] Figure 4 This is a side structural diagram of the guide strip of the utility model.

[0018] In the figure: 1. Blade root; 2. Flow blade; 3. Flow cavity; 4. Blade plate; 5. Air inlet hole; 6. Air outlet hole; 7. Flow reinforcement vertical plate; 8. Blade sliding into the mounting block; 9. Dispersed air flow hole; 10. Top air outlet hole; 11. Guide strip; 12. Diversion channel. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figure 1-4The utility model provides a technical solution: a flow blade structure of a steam turbine, comprising a blade root 1, and a flow blade 2 at the end of the blade root 1 for guiding and cooling the blade. The flow blade 2 converts the kinetic energy of a high-speed fluid flowing through the blade into pressure and kinetic energy on the blade through its specific shape and angle. This process utilizes the kinetic energy of the fluid and the shape design of the blade to complete the conversion of kinetic energy, and plays a role in cooling the blade. The interior of the flow blade 2 is provided with a flow cavity 3 for allowing airflow to enter and evenly dissipate heat for the flow blade 2. The external airflow enters the flow cavity 3 through the air inlet hole 5 and flows, which can cool the flow blade 2, reduce the impact of the airflow on the flow blade 2, and increase the service life of the flow blade 2. The top inner side of the flow cavity 3 is provided with a blade plate 4 for sealing the flow cavity 3 so that the airflow flows in and effectively dissipates heat. After the airflow enters the interior of the flow cavity 3, there will be no rapid outflow of the airflow. It has the function of moving and guiding the flow direction. One side of the front end surface of the flow blade 2 is vertically and evenly provided with an air intake hole 5 that is connected to the flow cavity 3 and allows the air flow to enter. When the airflow pushes the flow blade 2 to rotate, part of the airflow passes through the air intake hole 5 and flows into the interior of the flow cavity 3. The front end of the outside of the flow blade 2 is vertically and equidistantly provided with air outlet holes 6 to allow the airflow to have a certain fluidity and avoid damage to the flow blade 2 caused by large airflow. The interior of the flow cavity 3 is evenly and vertically provided with a reinforced flow vertical plate 7 for internal reinforcement support for the high-speed rotation of the flow blade 2, which not only plays a role in guiding the flow, but also enhances the overall stability of the flow blade 2.

[0021] The bottom of the blade root 1 is provided with a blade sliding mounting block 8 for combining and mounting the flow blades 2 on the turbine, so that several flow blades 2 are fixed on the rotating shaft of the turbine by using the blade sliding mounting block 8 to convert kinetic energy into mechanical energy. The air intake hole 5 is connected with the flow cavity 3, and the air intake end of the air intake hole 5 is designed with an inclined structure, so that the external air flow can smoothly flow into the interior of the flow cavity 3 for circulation, and the air intake hole 5 is inclinedly arranged on the flow blade 2 to facilitate the entry of airflow, so that the air flow can smoothly enter the interior of the flow cavity 3 to cool the flow blade 2. The surface of the enhanced flow vertical plate 7 is evenly penetrated with a dispersed airflow hole 9 that allows the air flow entering the flow cavity 3 to circulate to the entire flow blade 2 to cool down and reduce resistance. It can disperse the external airflow entering, reduce the pressure of the airflow, and allow the airflow to flow to the interior of the entire flow blade 2.

[0022] The surface of the blade 4 is evenly provided with top air flow outlet holes 10, so that the air flow shell inside the flow cavity 3 flows out from the flow blade 2, reducing the impact pressure of the airflow inside the flow cavity 3. The blade 4 is fixed to the top of the flow cavity 3 by welding, and the top of the strengthening flow vertical plate 7 is fixed to the ground of the blade 4, which can ensure the overall strength of the flow blade 2 during operation. The front end surface of the flow blade 2 is evenly provided with a guide strip 11 for guiding the airflow in the transverse direction, which is beneficial for the external airflow to quickly enter the flow cavity 3 and flow. The guide strip 11 is triangular and a diversion channel 12 is opened on the surface at a corner, which can reduce the impact force of the airflow on the guide strip 11, and the flow blade 2 is made of alloy metal plate to enhance the overall strength.

[0023] Specifically, when in use, the flow blades 2 are sequentially slid into the mounting block 8 on the blade root 1 and mounted on the rotating shaft of the steam turbine, and the airflow is introduced to rotate the flow blades 2 by the force of the air blowing, so that the steam turbine can follow the operation, and the blown airflow flows on the surface of the flow blades 2, and the guide strips 11 equidistantly arranged on the flow blades 2 are used to guide the flowing airflow to flow into the air inlet holes 5, and the airflow entering the air inlet holes 5 quickly flows into the interior of the flow cavity 3. Due to the continuous rotation of the flow blades 2, the airflow with greater impact force sequentially passes through the reinforcing flow vertical plates 7 arranged inside the flow cavity 3, and is evenly distributed using the dispersed airflow holes 9. The airflow is dispersed and flows to the entire flow blade 2, while reducing the impact force of the airflow and the damage caused by the airflow impact force to the flow blade 2. The flow of the airflow can take away the heat inside the flow cavity 3 and discharge it from the air outlet 6, so as to cool the flow blade 2 and reduce the impact force of the airflow, making the airflow flow smoother. After the airflow on the flow blade 2 enters the flow cavity 3, it is diverted by the dispersed airflow hole 9, so that the air pressure value of the airflow is dispersed and becomes smaller, and it flows smoothly inside the flow blade 2 to cool the blade. In addition, by strengthening the flow vertical plate 7 on the flow blade 2, the impact force of the airflow on the rotation of the flow blade 2 can be reduced.

[0024] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A through-flow blade structure for a steam turbine, comprising a blade root (1), and a through-flow blade (2) at the end of the blade root (1) for cooling the blade guide flow, characterized in that: The interior of the through-flow blade (2) is provided with a through-flow cavity (3) for allowing airflow to enter and uniformly dissipate heat for the through-flow blade (2); the inner top end of the through-flow cavity (3) is provided with a blade (4) for sealing the through-flow cavity (3) and allowing airflow to flow in and effectively dissipate heat; one side of the front end surface of the through-flow blade (2) is vertically and uniformly provided with air inlet holes (5) that are in communication with the through-flow cavity (3) and allow airflow to enter; the outer front end of the through-flow blade (2) is vertically and equidistantly provided with air outlet holes (6); and the interior of the through-flow cavity (3) is uniformly and vertically provided with reinforced through-flow vertical plates (7) for internally reinforcing support for the high-speed rotation of the through-flow blade (2).

2. The steam turbine flow blade structure according to claim 1, characterized in that: The bottom of the blade root (1) is provided with a blade sliding mounting block (8) for assembling and mounting the through-flow blades (2) on the steam turbine.

3. The steam turbine flow blade structure according to claim 1, characterized in that: The air inlet hole (5) is connected to the flow cavity (3) through-hole, and the air inlet hole (5) is arranged obliquely on the flow blade (2) to facilitate airflow entry.

4. The steam turbine flow blade structure according to claim 1, characterized in that: The surface of the enhanced flow vertical plate (7) is evenly penetrated with dispersed airflow holes (9) for allowing the airflow entering the flow cavity (3) to flow through the entire flow blade (2) to reduce temperature and lower resistance.

5. The steam turbine flow blade structure according to claim 1, characterized in that: Top airflow outlet holes (10) are evenly arranged on the surface of the blade (4), and the blade (4) is fixed to the top end of the flow cavity (3) by welding.

6. The steam turbine flow blade structure according to claim 1, characterized in that: The front end surface of the through-flow blade (2) is evenly and laterally provided with a guide strip (11) for guiding the airflow. The guide strip (11) is triangular and has a diversion channel (12) formed on the surface at a corner.

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