Steam Seal Device

Abstract

A steam seal device is provided in which a plurality of seal teeth and connecting arc grooves are provided to form a blocking gap and an expansion cavity by the structure between the teeth during the flow of high-pressure steam, thereby achieving a sealing effect after the high-pressure steam passes through these gaps based on steam aeration technology, and the sealing effect is improved by the cooperation of a stopper and a steam seal ring. [Solution] The steam seal ring includes a steam seal ring (100) provided on the outside of a rotor, and a steam seal body (200) provided on one side of the steam seal ring, the steam seal ring is provided on the inner wall of the steam seal ring, the steam seal ring includes an arc-shaped block (101), a mounting block (102) fixedly connected to the inside of the arc-shaped block, and high and low teeth (103) fixedly connected to the inside of the mounting block, and a slider (104) is fixedly connected to the other side of the arc-shaped block, the high and low teeth include seal teeth and connecting arc grooves, and the connecting arc grooves are provided between the seal teeth.

Description

[Technical field]

[0001] The present invention relates to the technical field of steam turbines, and more particularly to steam seal devices. [Background technology]

[0002] A steam turbine is one of the core devices in a thermal power plant, and can convert the thermal energy of steam into the mechanical energy of a rotor. When steam undergoes energy conversion in the passages of the moving blades and stator blades of the steam turbine, a steam seal device is provided at the blade tips and blade roots of the moving blades and stator blades to reduce the steam leakage loss and improve the thermal energy conversion efficiency of the steam turbine. Summary of the Invention [Problem to be solved by the invention]

[0003] The steam seal devices for the blade tips and roots of moving blades and stationary blades of steam turbines mainly use labyrinth seals, which use high and low teeth between the steam seal and the rotor to throttle and reduce the pressure of high-pressure steam and reduce steam leakage loss. The conventional steam seal devices have the following problems: the steam seal tooth structure of the comb tooth labyrinth seal still allows high-pressure steam to leak out, reducing the sealing effect; when the rotor of the steam turbine exceeds the critical speed or has abnormally large vibrations, the steam seal teeth are permanently worn, which increases the sealing gap and increases the steam leakage loss; when the rotor rotates, the steam seal teeth of the comb tooth labyrinth seal are prone to disengagement, which increases the steam leakage loss. [Means for solving the problem]

[0004] SUMMARY OF THE DISCLOSURE In view of the above-mentioned technical problem of high-pressure steam leaking out due to the structure of the steam seal teeth themselves of the conventional labyrinth seal, the present invention has been proposed.

[0005] The objective of the present invention is to provide a steam seal device, the objective of which is to change the flow direction of the steam flowing through the steam seal ring and the steam seal structure, thereby reducing the gas velocity and increasing the flow resistance by utilizing the collision principle, thereby achieving the purpose of sealing.

[0006] In order to solve the above technical problems, the present invention provides the following technical solution: A steam seal device, comprising: a steam seal ring provided on the outside of a rotor; and a steam seal body provided on one side of the steam seal ring, the steam seal ring is provided on an inner wall of the steam seal body, the steam seal ring includes an arc-shaped block, a mounting block fixedly connected to the inside of the arc-shaped block, and high-low teeth fixedly connected to the inside of the mounting block, a slider is fixedly connected to the other side of the arc-shaped block, the high-low teeth include seal teeth and connecting arc grooves, and the connecting arc grooves are provided between the seal teeth.

[0007] As one preferred technical means of the steam turbine steam seal device of the present invention, the arc-shaped block includes a through hole, the through hole is provided in the arc-shaped block, and at least two of the through holes are provided.

[0008] As one preferred technical means of the steam turbine steam seal device of the present invention, the high and low teeth include seal teeth and connecting arc grooves, at least two seal teeth are provided, and the connecting arc grooves are provided between adjacent seal teeth.

[0009] As one preferred technical means of the steam turbine steam seal device of the present invention, the seal teeth include a first seal tooth, a second seal tooth, a third seal tooth and a fourth seal tooth, the second seal tooth is provided on one side of the first seal tooth, the third seal tooth is provided on one side of the second seal tooth, the fourth seal tooth is provided on one side of the third seal tooth, the second seal tooth is greater in height than the first seal tooth, the third seal tooth is greater in height than the second seal tooth, and the fourth seal tooth is greater in height than the third seal tooth.

[0010] As one preferred technical means of the steam turbine steam seal device of the present invention, a first lateral tooth is provided on a side of the first seal tooth adjacent to the second seal tooth, a second lateral tooth is provided on a side of the second seal tooth adjacent to the third seal tooth, a third lateral tooth is provided on a side of the third seal tooth adjacent to the fourth seal tooth, and a fourth lateral tooth is provided on a side of the fourth seal tooth away from the third seal tooth.

[0011] As one preferred technical means of the steam turbine steam seal device of the present invention, a first thread groove is provided in the connecting arc groove between the first seal tooth and the second seal tooth, a second thread groove is provided in the connecting arc groove between the second seal tooth and the third seal tooth, and a third thread groove is provided in the connecting arc groove between the third seal tooth and the fourth seal tooth.

[0012] As one preferred technical means of the steam turbine steam seal device of the present invention, the slider includes a first positioning hole, and the first positioning hole is provided on a side of the slider adjacent to the inner wall of the steam seal body.

[0013] As one preferred technical means of the steam turbine steam seal device of the present invention, the steam seal body includes a semicircular block, a T-shaped slide groove, and a stopper, the slide groove is provided on the inner wall of the semicircular block, the stopper is provided in the semicircular block, and the slider is slidably connected to the T-shaped slide groove.

[0014] As one preferred technical means of the steam turbine steam seal device of the present invention, the semicircular block includes a guide block, the guide blocks are provided on both sides of the semicircular block, the T-shaped slide groove includes a second positioning hole, the second positioning hole is provided on the bottom side of the T-shaped slide groove, at least two second positioning holes are provided, at least two stoppers are provided, the stopper includes an elastic member and a positioning pillar, the elastic member is provided at one end of the positioning pillar, and the other end of the positioning pillar is provided in the second positioning hole.

[0015] As one preferred technical means of the steam turbine steam seal device of the present invention, the positioning post includes an exhaust hole and an intake hole, the exhaust hole is provided on a side wall of the positioning post, and the intake hole is provided on one end of the positioning post. Effect of the Invention

[0016] The beneficial effects of the steam turbine steam seal device of the present invention are as follows: by providing a plurality of seal teeth and connecting arc grooves, a blocking gap and an expansion cavity are formed by the structure between the teeth during the flow of high-pressure steam, so that based on the steam supplement technology, a sealing effect is achieved after the high-pressure steam passes through these gaps, and the cooperation of the stopper and the steam seal ring improves the sealing effect. [Brief description of the drawings]

[0017] In order to more clearly describe the technical means of the embodiments of the present invention, the following briefly introduces the drawings necessary for describing the embodiments. The drawings in the following description are only some embodiments of the present invention, and it is obvious that a person skilled in the art can obtain other drawings from these drawings without creative efforts. [Figure 1] 1 is a cross-sectional view of a steam seal device according to the present invention; [Diagram 2] 2 is a structural display diagram of a steam seal device according to the present invention; [Diagram 3]1 is a cross-sectional view of a steam seal body according to the present invention; [Figure 4] 2 is a partial enlarged cross-sectional view of a steam seal body according to the present invention; [Diagram 5] 1 is a cross-sectional view of a steam seal ring according to the present invention; [Figure 6] 1 is a partially enlarged view of a steam seal ring according to the present invention; [Figure 7] 2 is a partially enlarged view of the steam seal ring according to the present invention; FIG. [Figure 8] FIG. 2 is a structural diagram of a stopper according to the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] To make the above objectives, features and advantages of the present invention more clear and understandable, specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0019] In the following description, numerous specific details are set forth to facilitate a thorough understanding of the present invention; however, the present invention may be embodied in other ways different from those described herein, and those skilled in the art may make similar generalizations without departing from the scope of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

[0020] Furthermore, references herein to "one embodiment" or "an embodiment" refer to a particular feature, structure, or characteristic that may be included in at least one implementation of the invention. The appearances of "in one embodiment" in various places in the specification do not necessarily all refer to the same embodiment, or to an embodiment that is mutually exclusive or alternatively distinct from other embodiments.

[0021] Example 1 1-2 and 6, which show a first embodiment of the present invention, which provides a steam seal device, which includes a steam seal ring 100 provided on the outside of a rotor 1 and a steam seal body 200 provided on one side of the steam seal ring 100, and the steam seal ring 100 is provided on the inner wall of the steam seal body 200.

[0022] Preferably, the steam seal ring 100 includes an arc-shaped block 101, a mounting block 102 fixedly connected to the inside of the arc-shaped block 101, and high and low teeth 103 fixedly connected to the inside of the mounting block 102, and a slider 104 fixedly connected to the other side of the arc-shaped block 101.

[0023] Furthermore, the high-low teeth 103 include seal teeth 103a and connecting arc grooves 103b, and the seal teeth 103a are distributed in a plurality of high and low positions, and the connecting arc grooves 103b are provided between the seal teeth 103a.

[0024] In use, the steam seal ring 100 is mounted in the steam seal body 200 by the slider 104, the steam seal ring 100 is provided on the inner wall of the steam seal ring 100, and the steam seal body 200 with the steam seal ring 100 attached is provided on the outside of the rotor 1. Due to the restricting action of the rotor 1 and the high and low teeth 103, the high-pressure steam of the steam turbine passes through the seal teeth 103a distributed at high and low positions and the connecting arc-shaped grooves 103b in sequence. Due to the different heights of the seal teeth 103a and the arc-shaped connecting arc-shaped grooves 103b, the flow velocity of the high-pressure steam of the steam turbine is reduced, and the loss of steam is reduced.

[0025] Example 2 1 to 7, these figures show a second embodiment of the present invention, which further differs from the previous embodiment in that the arc-shaped block 101 includes a through hole 101a, the through hole 101a is provided in the arc-shaped block 101, and at least two through holes 101a are provided.

[0026] Preferably, the high and low teeth 103 include seal teeth 103a and connecting arc grooves 103b, at least two seal teeth 103a are provided, and the connecting arc grooves 103b are provided between adjacent seal teeth 103a.

[0027] Furthermore, the seal teeth 103a include a first seal tooth 103a-1, a second seal tooth 103a-2, a third seal tooth 103a-3, and a fourth seal tooth 103a-4, the second seal tooth 103a-2 is provided on one side of the first seal tooth 103a-1, the third seal tooth 103a-3 is provided on one side of the second seal tooth 103a-2, the fourth seal tooth 103a-4 is provided on one side of the third seal tooth 103a-3, the second seal tooth 103a-2 is taller than the first seal tooth 103a-1, the third seal tooth 103a-3 is taller than the second seal tooth 103a-2, and the fourth seal tooth 103a-4 is taller than the third seal tooth 103a-3. The height of the seal tooth 103a-1 is larger than that of the seal tooth 103a-3, that is, the heights of the first seal tooth 103a-1 to the fourth seal tooth 103a-4 are from low to high, there are at least two seal teeth 103a, the first seal tooth 103a-1 is on the side adjacent to the fourth seal tooth 103a-4, the seal teeth 103a are periodically distributed, and the first seal tooth 103a-1, the second seal tooth 103a-2, the third seal tooth 103a-3 and the fourth seal tooth 103a-4 have different heights, and blocking gaps and expansion cavities are formed between the teeth, and based on the steam aeration technology, a sealing effect is achieved after the high-pressure steam passes through these gaps.

[0028] Further, a first lateral tooth 103a-11 is provided on the side of the first seal tooth 103a-1 adjacent to the second seal tooth 103a-2, a second lateral tooth 103a-21 is provided on the side of the second seal tooth 103a-2 adjacent to the third seal tooth 103a-3, a third lateral tooth 103a-31 is provided on the side of the third seal tooth 103a-3 adjacent to the fourth seal tooth 103a-4, and a third lateral tooth 103a-31 is provided on the side of the fourth seal tooth 103a-4 adjacent to the third seal tooth 103a-3. A fourth lateral tooth 103a-41 is provided on the side away from the first lateral tooth 103a-11, the second lateral tooth 103a-21, the third lateral tooth 103a-31 and the fourth lateral tooth 103a-41, and the high-pressure steam passing through the connecting arc groove 103b forms a vortex in the semi-sealed space formed by the seal teeth and the lateral teeth, and slows down.In addition, the lateral teeth have a certain limiting effect on the loss of high-pressure steam when the seal tooth 103a is worn.

[0029] Furthermore, a first screw groove 103b-1 is provided in the connecting arc groove 103b between the first seal tooth 103a-1 and the second seal tooth 103a-2, a second screw groove 103b-2 is provided in the connecting arc groove 103b between the second seal tooth 103a-2 and the third seal tooth 103a-3, and a third screw groove 103b-3 is provided in the connecting arc groove 103b between the third seal tooth 103a-3 and the fourth seal tooth 103a-4. The helical protrusions provided in the screw grooves gradually reduce the flow rate of the steam, and the kinetic energy of the steam is dissipated in the form of a vortex, thereby exerting a damping effect on steam leakage and suppressing steam leakage.

[0030] In use, the first seal tooth 103a-1, the second seal tooth 103a-2, the third seal tooth 103a-3 and the fourth seal tooth 103a-4 have different heights, and blocking gaps and expansion cavities are formed between the teeth. Based on the steam aeration technology, the high-pressure steam achieves a sealing effect after passing through these gaps. Due to the first transverse tooth 103a-11, the second transverse tooth 103a-21, the third transverse tooth 103a-31 and the fourth transverse tooth 103a-41, the high-pressure steam passing through the connecting arc groove 103b forms a vortex in the semi-sealed space formed by the seal teeth and the transverse teeth, and is decelerated. In addition, the connecting arc groove 103b between the first seal tooth 103a-1 and the second seal tooth 103a-2 forms a vortex in the semi-sealed space formed by the seal teeth and the transverse teeth, and is decelerated. a first thread groove 103b-1 is provided in the connecting arc groove 103b between the second seal tooth 103a-2 and the third seal tooth 103a-3, a second thread groove 103b-2 is provided in the connecting arc groove 103b between the third seal tooth 103a-3 and the fourth seal tooth 103a-4, the helical protrusions provided in the thread grooves gradually reduce the flow rate of the steam, and the kinetic energy of the steam is dissipated in the form of a vortex, which has a damping effect on steam leakage and plays an inhibitory effect on steam leakage. With the single structure of the seal teeth 103a and the connecting arc groove 103b, the steam seal structure achieves better sealing.

[0031] Example 3 1 to 8, these figures show a third embodiment of the present invention, which further differs from the previous embodiments in that the slider 104 includes a first positioning hole 104a, and the first positioning hole 104a is provided on the side of the slider 104 adjacent to the inner wall of the steam seal body 200.

[0032] Preferably, the steam seal body 200 includes a semicircular block 201, a T-shaped slide groove 202, and a stopper 203, the slide groove 202 is provided on the inner wall of the semicircular block 201, the stopper 203 is provided within the semicircular block 201, and the slider 104 is slidably connected to the T-shaped slide groove 202.

[0033] Furthermore, the semicircular block 201 includes a guide block 201a, and the guide block 201a is provided on both sides of the semicircular block 201, and the flow direction of the high-pressure steam is limited by the guide block 201a, the T-shaped slide groove 202 includes a second positioning hole 202a, and the second positioning hole 202a is provided on the bottom side of the T-shaped slide groove 202, at least two second positioning holes 202a are provided, at least two stoppers 203 are provided, the stoppers 203 include an elastic member 203a and a positioning pillar 203b, the elastic member 203a is provided at one end of the positioning pillar 203b, and the other end of the positioning pillar 203b is provided within the second positioning hole 202a.

[0034] Furthermore, the guide block 201a includes a guide slope 201a-1, which is provided on the guide block 201a, and the positioning pillar 203b includes an exhaust hole 203b-1 and an intake hole 203b-2, which is provided on a side wall of the positioning pillar 203b and which is provided on one end of the positioning pillar 203b.

[0035] In use, the elastic member 203a is provided at one end of the positioning pillar 203b, the other end of the positioning pillar 203b is provided in the second positioning hole 202a, the elastic member 203a is provided in the first positioning hole 104a, and a part of the high-pressure steam flows into between the steam seal body 200 and the steam seal ring 100 through the guide slope 201a-1 provided at the top end of the guide block 201a, enters the intake hole 203b-2 from the through hole 101a, and then flows out from the exhaust hole 203b-1 provided at the middle end of the positioning pillar 203b. The pressure of the steam flows through the exhaust hole 203b-1 at the middle end of the positioning pillar 203b. The pressure flows out from the positioning post 203b, which presses the positioning post 203b and inserts it into the second positioning hole 202a, thereby realizing the initial positioning of the steam seal ring 100, preventing it from shifting after installation, and ensuring the sealing effect. The combination of the positioning post 203b and the second positioning hole 202a further restricts the movement of the arc-shaped block 101, reduces the driving force on the steam seal ring 100 caused by the flow of high-pressure steam, and avoids friction between the high and low teeth 103 and the rotor 1. That is, the positioning post 203b enhances the stability and sealing performance of the steam seal ring 100 and reduces potential friction problems.

[0036] It is important to note that the structure and arrangement of the present application as shown in the various exemplary embodiments are illustrative only. Although only a few embodiments are described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications (e.g., variations in the size, dimensions, structure, shape, and proportions of the various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting configurations, use of materials, colors, orientations, etc.) are possible without substantially departing from the novel teachings and advantages of the subject matter described in this application. For example, elements shown as integrally formed may be composed of multiple parts or elements, the positions of elements may be reversed or otherwise changed, and the nature or number of separate elements or positions may be modified or changed. Accordingly, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the utility claims, the term "means plus function" is intended to encompass structures described herein as performing the recited functions, not just structural equivalents, but equivalent structures as well. Other substitutions, modifications, changes, and omissions can be made in the design, operating conditions, and configuration of the exemplary embodiments without departing from the scope of the present invention. Accordingly, the present invention is not limited to a particular embodiment, but extends to numerous modifications that still fall within the scope of the appended claims.

[0037] Moreover, in order to provide a concise description of example embodiments, all features of an actual embodiment (i.e., those that are not relevant to the currently contemplated best mode of practicing the invention or that are not relevant to practicing the invention) may not be described.

[0038] It should be understood that, as in any engineering or design project, numerous implementation-specific decisions may be made during the development of any actual implementation. While such a development effort may be complex and time-consuming, it would nevertheless be a routine undertaking of design, fabrication, and manufacture without undue experimentation for those of ordinary skill in the art having the benefit of this disclosure.

[0039] It should be noted that the above embodiments are merely intended to explain the technical solution of the present invention, and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all of them should be included in the scope of the utility model registration claims of the present invention.

Claims

1. 1. A steam seal device comprising:

1. A steam seal device comprising: a steam seal ring (100) provided on the outside of a rotor (1); and a steam seal body (200) provided on one side of the steam seal ring (100), the steam seal ring (100) being provided on an inner wall of the steam seal body (200), the steam seal ring (100) including a circular arc-shaped block (101), a mounting block (102) fixedly connected to an inner side of the circular arc-shaped block (101), and high-low teeth (103) fixedly connected to an inner side of the mounting block (102), a slider (104) being fixedly connected to the other side of the circular arc-shaped block (101), the high-low teeth (103) including seal teeth (103a) and connecting circular arc grooves (103b), the connecting circular arc grooves (103b) being provided between the seal teeth (103a).

2. 2. The steam seal device according to claim 1, wherein the arc-shaped block (101) includes a through hole (101a), the through hole (101a) is provided in the arc-shaped block (101), and at least two of the through holes (101a) are provided.

3. 3. The steam seal device according to claim 2, wherein the high and low teeth (103) include seal teeth (103a) and connecting arc grooves (103b), at least two of the seal teeth (103a) are provided, and the connecting arc grooves (103b) are provided between adjacent seal teeth (103a).

4. The seal teeth (103a) include a first seal tooth (103a-1), a second seal tooth (103a-2), a third seal tooth (103a-3) and a fourth seal tooth (103a-4), the second seal tooth (103a-2) is provided on one side of the first seal tooth (103a-1), the third seal tooth (103a-3) is provided on one side of the second seal tooth (103a-2), and the fourth seal tooth (103a-4) is provided on one side of the second seal tooth (103a-4). 4) is provided on one side of the third seal tooth (103a-3), the second seal tooth (103a-2) is greater in height than the first seal tooth (103a-1), the third seal tooth (103a-3) is greater in height than the second seal tooth (103a-2), and the fourth seal tooth (103a-4) is greater in height than the third seal tooth (103a-3).

5. a first lateral tooth (103a-11) is provided on a side of the first seal tooth (103a-1) adjacent to the second seal tooth (103a-2); a second lateral tooth (103a-21) is provided on a side of the second seal tooth (103a-2) adjacent to the third seal tooth (103a-3); a third lateral tooth (103a-31) is provided on a side of the third seal tooth (103a-3) adjacent to the fourth seal tooth (103a-4); 5. The steam seal device according to claim 4, characterized in that a fourth transverse tooth (103a-41) is provided on a side of the fourth seal tooth (103a-4) that is away from the third seal tooth (103a-3).

6. a first screw groove (103b-1) is provided in a connecting arc groove (103b) between the first seal tooth (103a-1) and the second seal tooth (103a-2); a second screw groove (103b-2) is provided in a connecting arc groove (103b) between the second seal tooth (103a-2) and the third seal tooth (103a-3); 6. The steam seal device according to claim 5, characterized in that a third screw groove (103b-3) is provided in a connecting arc groove (103b) between the third seal tooth (103a-3) and the fourth seal tooth (103a-4).

7. 7. The steam seal device according to claim 1, wherein the slider (104) includes a first positioning hole (104a), the first positioning hole (104a) being provided on a side of the slider (104) adjacent to an inner wall of the steam seal body (200).

8. 8. The steam seal device according to claim 7, wherein the steam seal body (200) includes a semicircular block (201), a T-shaped slide groove (202), and a stopper (203), the slide groove (202) being provided on an inner wall of the semicircular block (201), the stopper (203) being provided within the semicircular block (201), and the slider (104) being slidably connected to the T-shaped slide groove (202).

9. The semicircular block (201) includes guide blocks (201a), and the guide blocks (201a) are provided on both sides of the semicircular block (201); The T-shaped slide groove (202) includes a second positioning hole (202a), the second positioning hole (202a) is provided on the bottom side of the T-shaped slide groove (202), and at least two second positioning holes (202a) are provided; 9. The steam seal device according to claim 8, characterized in that at least two stoppers (203) are provided, the stoppers (203) include an elastic member (203a) and a positioning pillar (203b), the elastic member (203a) is provided at one end of the positioning pillar (203b), and the other end of the positioning pillar (203b) is provided within the second positioning hole (202a).

10. The guide block (201a) includes a guide slope (201a-1), and the guide slope (201a-1) is provided on the guide block (201a), 10. The steam seal device of claim 9, wherein the positioning pillar (203b) includes an exhaust hole (203b-1) and an intake hole (203b-2), the exhaust hole (203b-1) being provided in a side wall of the positioning pillar (203b) and the intake hole (203b-2) being provided at one end of the positioning pillar (203b).

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