Steam turbine steam seal to prevent leakage at joint

Abstract

This invention relates to the technical field of steam sealing, and discloses a steam sealing device for a steam turbine to prevent leakage at the joint surface. The device includes an output mechanism comprising a rotor and a convex ring fixedly connected to the outside of the rotor; a support mechanism comprising a support frame disposed on the outside of the rotor, a fixing groove formed on the outside of the support frame, and a bolt threaded to the outside of the fixing groove; through the ingenious structural design of the sealing key, when there is no gap between the first and second arc-shaped blocks, the sealing key does not generate thrust, thus ensuring the overall steam sealing effect of the device. When a gap is formed between the first and second arc-shaped blocks, the sealing key becomes elastic and fills the gap, thereby slowing down the rate of steam loss. Combined with the sealing key's unidirectional sliding capability, the overall stability of the sealing key is further improved, further reducing the rate of steam leakage due to gaps.

Description

Technical Field

[0001] This invention relates to the technical field of steam sealing, and more particularly to a steam sealing device for a steam turbine to prevent leakage at the mating surface. Background Technology

[0002] Steam turbines are one of the core pieces of equipment in thermal power plants, converting the thermal energy of steam into the mechanical energy of the rotor. To reduce steam leakage at the tips and roots of the moving and stationary blades during energy conversion and to improve the efficiency of steam thermal energy conversion, steam sealing devices are installed at these locations to minimize steam leakage.

[0003] Currently, the steam sealing devices installed at the tips and roots of the turbine rotor blades mainly employ comb-tooth labyrinth seals. These seals rely on the high and low teeth between the sealing device and the rotor to throttle and reduce the pressure of high-pressure steam, thereby minimizing steam leakage losses. A typical steam sealing device consists of four or six sealing arc segments forming a ring structure. To improve the steam blocking effect of the sealing device, designers continuously refine the shape of the sealing teeth to reduce leakage losses, often neglecting the steam leakage problem at the sealing joint surface. Because the sealing device joint surface is designed with expansion gaps, some steam inevitably leaks from the sealing device joint surface during operation. Summary of the Invention

[0004] In view of the problems existing in the prior art, the present invention is proposed.

[0005] Therefore, the purpose of this invention is to provide a steam sealing device for a steam turbine that prevents leakage at the mating surface, with the aim of avoiding steam leakage caused by expansion gaps.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a steam sealing device for preventing leakage at the mating surface of a steam turbine, comprising,

[0007] The output mechanism includes a rotor and a convex ring fixedly connected to the outside of the rotor;

[0008] The support mechanism includes a support frame disposed on the outside of the rotor, a fixing groove formed on the outside of the support frame, and a bolt threaded to the outside of the fixing groove;

[0009] The support frame has an inner groove for mounting, and a gas seal component is fitted inside the groove.

[0010] As a preferred embodiment of the steam sealing device for preventing leakage at the joint surface of the present invention, the steam sealing component includes a first arc block, a second arc block, a third arc block and a fourth arc block, wherein the first arc block, the second arc block, the third arc block and the fourth arc block are designed as quarter-circle arcs and their two ends are respectively in contact with each other.

[0011] As a preferred embodiment of the steam sealing device for preventing leakage at the joint surface of the present invention, wherein: an installation block is fixedly connected to the outer side of the first arc-shaped block, a first comb tooth is fixedly connected to the inner side of the first arc-shaped block, and a second comb tooth is fixedly connected to the inner side of the first arc-shaped block.

[0012] The second arc-shaped block, the third arc-shaped block, and the fourth arc-shaped block have the same shape and structure as the first arc-shaped block.

[0013] As a preferred embodiment of the steam sealing device for preventing leakage at the joint surface of the present invention, wherein: a groove is provided at one outer end of the first arc-shaped block, a circular cavity is provided at the bottom end of the groove, and an inner cavity is provided inside the first arc-shaped block.

[0014] As a preferred embodiment of the steam sealing device for preventing leakage at the joint surface of the present invention, a spring is provided inside the circular cavity, a sealing component is provided at the top of the spring, and a triggering component is provided inside the inner cavity.

[0015] As a preferred embodiment of the steam sealing device for preventing leakage at the joint surface of the present invention, the sealing assembly includes a sealing key fixedly connected to the top of the spring, a bottom groove formed at the bottom of the sealing key, and a positioning groove formed on the outside of the sealing key.

[0016] As a preferred embodiment of the steam sealing device for preventing leakage at the mating surface according to the present invention, the sealing assembly further includes a one-way groove formed on the outside of the sealing key, and a vent hole formed at the bottom of the positioning groove.

[0017] The upper ends of the vent holes are respectively opened at the bottom end of the positioning groove and the outside of the sealing key, and the bottom end of the vent holes is opened at the bottom end of the sealing key. The overall shape of the vent holes is set as an inverted cone.

[0018] As a preferred embodiment of the steam sealing device for preventing leakage at the joint surface of the present invention, the triggering component includes a rotating shaft rotatably connected inside the inner cavity, a telescopic rod fixedly connected to the outside of the rotating shaft, and a positioning rod hinged to one end of the telescopic rod.

[0019] The positioning rod is slidably connected to the bottom end of the inner cavity, and a torsion spring is provided inside the rotating shaft.

[0020] As a preferred embodiment of the steam sealing device for preventing leakage at the joint surface of the present invention, the triggering component further includes a wind plate hinged to the other end of the telescopic rod, and a one-way block fixedly connected to one side of the wind plate, wherein the wind plate is slidably connected to the top end of the inner cavity.

[0021] As a preferred embodiment of the steam sealing device for preventing leakage at the joint surface of the present invention, wherein: one end of the second arc-shaped block is further provided with a groove, and the air plate is inside the groove.

[0022] The beneficial effects of this invention are as follows: Through the ingenious structural design of the sealing key, when there is no gap between the first and second arc-shaped blocks, the sealing key will not generate thrust, thereby ensuring the overall steam sealing effect of the equipment. When a gap is generated between the first and second arc-shaped blocks, the sealing key will become elastic and fill the gap, thereby slowing down the rate of steam loss. Combined with the sealing key that can only slide in one direction, the overall stability of the sealing key is further improved, and the rate of steam leakage due to the gap is further reduced. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 This is a schematic diagram of the support frame structure of the present invention.

[0026] Figure 3 This is a schematic diagram of the support mechanism structure of the present invention.

[0027] Figure 4 This is a schematic diagram of the structure of the gas seal component of the present invention.

[0028] Figure 5 This is a schematic diagram of the first arc-shaped block structure of the present invention.

[0029] Figure 6 This is a partial structural schematic diagram of the present invention.

[0030] Figure 7 This is a partial schematic diagram of the two structures of the present invention.

[0031] Figure 8 This is a cross-sectional structural diagram of the present invention.

[0032] Figure 9 This is an enlarged structural diagram of part A of the present invention.

[0033] Figure 10 This is a schematic diagram of the sealing key structure of the present invention.

[0034] Figure 11 This is a schematic diagram of the sealing key of the present invention from another perspective. Detailed Implementation

[0035] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0036] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0037] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0038] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0039] Example 1

[0040] Reference Figures 1 to 11 This is the first embodiment of the present invention, which provides a steam sealing device for preventing leakage at the mating surface of a steam turbine. This device includes...

[0041] The output mechanism 100 includes a rotor 101 and a protruding ring 102 fixedly connected to the outside of the rotor 101;

[0042] The support mechanism 200 includes a support frame 201 disposed on the outside of the rotor 101, a fixing groove 202 opened on the outside of the support frame 201, and a bolt 203 threadedly connected to the outside of the fixing groove 202.

[0043] The support frame 201 has an inner mounting groove 204, and the steam seal component 205 is fitted inside the mounting groove 204.

[0044] Specifically, the gas seal component 205 includes a first arc block 205a, a second arc block 205b, a third arc block 205c, and a fourth arc block 205d. The first arc block 205a, the second arc block 205b, the third arc block 205c, and the fourth arc block 205d are designed as quarter-circle arcs, and their two ends are respectively in contact with each other.

[0045] Furthermore, an installation block 205e is fixedly connected to the outer side of the first arc-shaped block 205a, a first comb tooth 205f is fixedly connected to the inner side of the first arc-shaped block 205a, and a second comb tooth 205g is fixedly connected to the inner side of the first arc-shaped block 205a.

[0046] The second arc-shaped block 205b, the third arc-shaped block 205c, and the fourth arc-shaped block 205d have the same shape and structure as the first arc-shaped block 205a.

[0047] Furthermore, the outer end of the first arc-shaped block 205a is provided with a groove 205a-1, a circular cavity 205a-2 at the bottom of the groove 205a-1, and an inner cavity 205a-3 inside the first arc-shaped block 205a.

[0048] Preferably, a spring 205a-4 is provided inside the circular cavity 205a-2, a sealing component 205a-5 is provided at the top of the spring 205a-4, and a triggering component 205a-6 is provided inside the inner cavity 205a-3.

[0049] It should be noted that the sealing assembly 205a-5 includes a sealing key 205a-5a fixedly connected to the top of the spring 205a-4, a bottom groove 205a-5b formed at the bottom of the sealing key 205a-5a, and a positioning groove 205a-5c formed on the outside of the sealing key 205a-5a.

[0050] Preferably, the triggering component 205a-6 includes a rotating shaft 205a-6a rotatably connected inside the inner cavity 205a-3, a telescopic rod 205a-6b fixedly connected to the outside of the rotating shaft 205a-6a, and a positioning rod 205a-6c hinged to one end of the telescopic rod 205a-6b.

[0051] The positioning rod 205a-6c is slidably connected to the bottom end of the inner cavity 205a-3, and a torsion spring is installed inside the rotating shaft 205a-6a.

[0052] Preferably, the triggering assembly 205a-6 further includes a wind plate 205a-6d hinged to the other end of the telescopic rod 205a-6b, and a one-way block 205a-6e fixedly connected to one side of the wind plate 205a-6d, with the wind plate 205a-6d slidably connected to the top of the inner cavity 205a-3.

[0053] One end of the second arc-shaped block 205b is provided with a groove 205b-1, and the air plate 205a-6d is inside the groove 205b-1.

[0054] The first arc-shaped block 205a, the second arc-shaped block 205b, the third arc-shaped block 205c, and the fourth arc-shaped block 205d are installed in the mounting groove 204 of the support frame 201. After the two sets of support frames 201 are fixedly connected by bolts 203, when steam flows from one end of the rotor 101 to the other end, the steam loss can be reduced by the limiting and flow-blocking effect of the convex ring 102 on the outside of the rotor 101 and the first comb tooth 205f and the second comb tooth 205g.

[0055] In the initial state, the positioning rod 205a-6c is inserted into the positioning groove 205a-5c. Since the positioning rod 205a-6c is engaged with the positioning groove 205a-5c, the sealing key 205a-5a is always inside the slide groove 205a-1, preventing the spring 205a-4 from popping the sealing key 205a-5a out. This ensures that when the first arc block 205a and the second arc block 205b are in a sealed state, the elasticity of the spring 205a-4 cannot pop the sealing key 205a-5a out, thus ensuring the sealing performance at the connection between the first arc block 205a and the second arc block 205b. This prevents the elasticity of the spring 205a-4 from causing a gap between the first arc block 205a and the second arc block 205b, thereby ensuring the sealing effect on steam.

[0056] When the first arc-shaped block 205a and the second arc-shaped block 205b expand, creating a gap between them, some flowing steam enters the gap. This flowing steam then blows the fan plate 205a-6d, causing it to rotate around the pivot 205a-6a under the pressure of the steam. This rotation causes the positioning rod 205a-6c at the other end of the fan plate 205a-6b to slide out of the positioning groove 205a-5c, thus removing the limiting and fixing effect on the sealing key 205a-5a. At this point, the spring 205a-4, in conjunction with the sealing key 205a-5a, fills the gap between the first arc-shaped block 205a and the second arc-shaped block 205b, thereby reducing steam loss.

[0057] When the fan plate 205a-6d slides under the blowing of steam, the one-way block 205a-6e on the outside of the fan plate 205a-6d stops above the sealing key 205a-5a. Under the elasticity of the spring 205a-4, the sealing key 205a-5a slides upward, filling the gap between the first arc block 205a and the second arc block 205b. Then, the one-way block 205a-6e inserts into the one-way groove 205a-5d. With the cooperation of the one-way block 205a-6e and the one-way groove 205a-5d, the sealing key 205a-5a can only slide upward and cannot slide downward. This further ensures the stability of the sealing key 205a-5a after filling the gap, thereby reducing steam loss.

[0058] In summary, the ingenious structural design of the sealing key 205a-5a ensures that when there is no gap between the first arc-shaped block 205a and the second arc-shaped block 205b, the sealing key 205a-5a will not generate thrust, thus ensuring the overall steam sealing effect of the equipment. When a gap is formed between the first arc-shaped block 205a and the second arc-shaped block 205b, the sealing key 205a-5a will become elastic and fill the gap, thereby slowing down the rate of steam loss. Combined with the fact that the sealing key 205a-5a can only slide in one direction, the overall stability of the sealing key 205a-5a is further improved, and the rate of steam leakage due to gaps is further reduced.

[0059] Example 2

[0060] Reference Figure 10 and Figure 11 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the sealing assembly 205a-5 further includes a one-way groove 205a-5d opened on the outside of the sealing key 205a-5a, and a vent hole 205a-5e opened at the bottom of the positioning groove 205a-5c.

[0061] The upper ends of the vent holes 205a-5e are respectively opened at the bottom end of the positioning groove 205a-5c and the outside of the sealing key 205a-5a, and the bottom end of the vent holes 205a-5e is opened at the bottom end of the sealing key 205a-5a, and the overall shape of the vent holes 205a-5e is set as an inverted cone.

[0062] When the positioning rod 205a-6c slides out from the inside of the positioning groove 205a-5c, causing the sealing key 205a-5a to slide up and fill the gap, some steam will enter the inner cavity 205a-3, and enter the vent hole 205a-5e through the gap between the positioning rod 205a-6c and the inner cavity 205a-3. Finally, it will enter the space between the sealing key 205a-5a and the slide groove 205a-1 through the vent hole 205a-5e. The continuously injected steam can lift the sealing key 205a-5a again, thereby ensuring the stability of the sealing key 205a-5a in filling the gap between the first arc block 205a and the second arc block 205b.

[0063] Furthermore, the vent holes 205a-5e have openings on both sides at the top, which ensures the effective entry of steam between the sealing key 205a-5a and the slide groove 205a-1. The conical design of the vent holes 205a-5e slows down the speed at which gas flows out of the space between the sealing key 205a-5a and the slide groove 205a-1, thereby ensuring the lifting effect of steam on the sealing key 205a-5a.

[0064] In summary, after the sealing key 205a-5a slides up and fills the gap, steam can also enter between the sealing key 205a-5a and the groove 205a-1, thereby further improving the effect of the sealing key 205a-5a on intermittent filling.

[0065] Example 3

[0066] Reference Figures 1 to 11 This is the third embodiment of the present invention, which differs from the second embodiment in that:

[0067] In summary, the ingenious structural design of the sealing key 205a-5a ensures that it does not generate thrust when there is no gap between the first arc-shaped block 205a and the second arc-shaped block 205b, thus guaranteeing the overall steam sealing effect of the equipment. When a gap is formed between the first arc-shaped block 205a and the second arc-shaped block 205b, the sealing key 205a-5a becomes elastic and fills the gap, thereby slowing down the rate of steam loss. Combined with the fact that the sealing key 205a-5a can only slide in one direction, the overall stability of the sealing key 205a-5a is further improved, further reducing the rate of steam leakage due to the gap. Moreover, after the sealing key 205a-5a slides upward and fills the gap, steam can also enter between the sealing key 205a-5a and the slide groove 205a-1, thereby further improving the intermittent filling effect of the sealing key 205a-5a.

[0068] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, 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 claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0069] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0070] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A steam sealing device for a steam turbine to prevent leakage at the mating surface, characterized in that: include, The output mechanism (100) includes a rotor (101) and a convex ring (102) fixedly connected to the outside of the rotor (101). The support mechanism (200) includes a support frame (201) disposed on the outside of the rotor (101), a fixing groove (202) opened on the outside of the support frame (201), and a bolt (203) threaded to the outside of the fixing groove (202). The support frame (201) has an installation groove (204) on its inner side, and a gas seal component (205) is adapted to be installed inside the installation groove (204). The gas seal component (205) includes a first arc-shaped block (205a), a second arc-shaped block (205b), a third arc-shaped block (205c), and a fourth arc-shaped block (205d). The first arc-shaped block (205a), the second arc-shaped block (205b), the third arc-shaped block (205c), and the fourth arc-shaped block (205d) are designed as quarter-circle arcs, and their two ends are respectively in contact with each other. The outer end of the first arc-shaped block (205a) is also provided with a groove (205a-1), a circular cavity (205a-2) at the bottom end of the groove (205a-1), and an inner cavity (205a-3) inside the first arc-shaped block (205a). A spring (205a-4) is provided inside the circular cavity (205a-2), a sealing component (205a-5) is provided at the top of the spring (205a-4), and a triggering component (205a-6) is provided inside the inner cavity (205a-3). The sealing assembly (205a-5) includes a sealing key (205a-5a) fixedly connected to the top of the spring (205a-4), a bottom groove (205a-5b) formed at the bottom of the sealing key (205a-5a), and a positioning groove (205a-5c) formed on the outside of the sealing key (205a-5a). The triggering assembly (205a-6) includes a rotating shaft (205a-6a) rotatably connected inside the inner cavity (205a-3), a telescopic rod (205a-6b) fixedly connected to the outside of the rotating shaft (205a-6a), and a positioning rod (205a-6c) hinged to one end of the telescopic rod (205a-6b). The positioning rod (205a-6c) is slidably connected to the bottom end of the inner cavity (205a-3), and a torsion spring is provided inside the rotating shaft (205a-6a). In the initial state, the positioning rod (205a-6c) is inserted into the positioning groove (205a-5c).

2. The steam sealing device for preventing leakage at the mating surface of a steam turbine according to claim 1, characterized in that: An mounting block (205e) is fixedly connected to the outer side of the first arc-shaped block (205a), a first comb tooth (205f) is fixedly connected to the inner side of the first arc-shaped block (205a), and a second comb tooth (205g) is fixedly connected to the inner side of the first arc-shaped block (205a). The second arc-shaped block (205b), the third arc-shaped block (205c), and the fourth arc-shaped block (205d) have the same shape and structure as the first arc-shaped block (205a).

3. A steam turbine steam seal arrangement to prevent leakage from a junction, according to claim 2, characterised in that: The sealing assembly (205a-5) also includes a one-way groove (205a-5d) formed on the outside of the sealing key (205a-5a) and a vent hole (205a-5e) formed at the bottom of the positioning groove (205a-5c). The upper ends of the vent holes (205a-5e) are respectively opened at the bottom end of the positioning groove (205a-5c) and the outside of the sealing key (205a-5a), and the bottom end of the vent holes (205a-5e) is opened at the bottom end of the sealing key (205a-5a), and the overall shape of the vent holes (205a-5e) is set as an inverted cone.

4. The steam turbine steam seal apparatus to prevent leakage at a joint face of claim 3, wherein: The triggering assembly (205a-6) also includes a wind plate (205a-6d) hinged to the other end of the telescopic rod (205a-6b) and a one-way block (205a-6e) fixedly connected to one side of the wind plate (205a-6d), wherein the wind plate (205a-6d) is slidably connected to the top end of the inner cavity (205a-3).

5. A turbine steam seal arrangement to prevent leakage from a junction, according to claim 4, characterised in that: The second arc-shaped block (205b) also has a groove (205b-1) at one end, and the wind plate (205a-6d) is located inside the groove (205b-1).

Images