Steam seal body and steam turbine steam seal
By adding the steam volume increase mechanism and steam inlet on the steam seal, the problem of insufficient steam seal is solved, and the safe operation and structural compactness of the turbine are achieved.
Patent Information
- Application Number
- CN202422238464.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-12
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-09-12
AI Technical Summary
The steam inlet pipe and circulation area of the lower part of the steam seal of the turbine are decreasing, resulting in insufficient steam volume of the steam seal, and air is prone to leak into the turbine, affecting the tightness of the vacuum and endangering the safe and economic operation of the turbine.
Add a steam volume increase mechanism on the steam seal, and drill holes on the steam seal to form a steam inlet, increase the number of steam inlets, and form a multi-layer sealing structure to ensure sufficient steam volume of the steam seal, and meet the steam supply needs by adjusting the drilling area, avoiding the addition of additional steam inlet pipes.
It ensures the vacuum tightness in the turbine, ensures the safe operation of the turbine, and makes the steam seal structure more compact, avoiding the increase in the number of additional steam inlet pipes.
Smart Images
Figure CN223136210U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of steam turbine gland, and particularly relates to a gland body and a steam turbine gland. Background Technique
[0002] A steam turbine is a rotary power machine with blades that converts thermal energy into mechanical energy through steam expansion. The glands of a steam turbine can be divided into front and rear glands, diaphragm glands, and flow path glands according to the installation location.
[0003] By introducing gland steam, the front and rear glands of the steam turbine maintain that external air does not leak into the steam turbine. However, due to the limitation of the foundation size, the steam inlet pipe and the flow area at the lower part of the gland body of some retrofitted units are forced to be reduced, resulting in insufficient gland steam volume, easy leakage of air into the steam turbine, and unqualified vacuum tightness, which has an adverse impact on the safe and economic operation of the steam turbine.
[0004] How to ensure sufficient gland steam volume when the steam inlet pipe and the flow area at the lower part of the gland body of the steam turbine are reduced is a technical problem that needs to be solved urgently at present.
[0005] It should be noted that the above information disclosed in this background technical part is only used to understand the background technology of the concept of this application. Therefore, the above description is not considered as information of the prior art. Summary of the Utility Model
[0006] The embodiments of the present disclosure at least provide a steam turbine gland body.
[0007] In a first aspect, the embodiments of the present disclosure provide a gland body, including:
[0008] A gland body and at least one steam volume increasing mechanism;
[0009] The steam volume increasing mechanism is fixedly arranged on the gland body;
[0010] The gland body is provided with at least one steam inlet;
[0011] The steam volume increasing mechanism is communicated with the gland body through the corresponding steam inlet;
[0012] The steam volume increasing mechanism is communicated with an external steam inlet pipe.
[0013] In an optional implementation manner, the steam volume increasing mechanism includes a chamber cover;
[0014] The chamber cover is fixedly arranged on the steam inlet, and forms a steam inlet chamber with the side wall and the bottom wall of the gland body;
[0015] The top of the steam inlet chamber is provided with an opening suitable for communicating with an external steam inlet pipe.
[0016] In an alternative embodiment, the chamber cover includes a top plate, a first side plate, a second side plate, and a third side plate;
[0017] The first side plate, the second side plate, the third side plate, the top plate, and the side wall and the bottom wall of the steam seal body enclose a steam inlet chamber.
[0018] In an alternative embodiment, an opening adapted to communicate with an external steam inlet pipe is formed in the top plate.
[0019] In an alternative embodiment, the number of the steam quantity increasing mechanisms is two;
[0020] The two steam quantity increasing mechanisms are respectively arranged on both sides of the steam seal body and are communicated with the steam seal body through corresponding steam inlet ports.
[0021] In an alternative embodiment, the angle α between the steam inlet port and the side wall of the steam seal body is an acute angle.
[0022] In an alternative embodiment, the number of the steam inlet ports communicated with each steam quantity increasing mechanism is 3, and the 3 steam inlet ports are arranged along the circumferential direction of the steam seal body.
[0023] In an alternative embodiment, at least two sealing chambers are formed in the steam seal body along the circumferential direction;
[0024] The steam inlet port is communicated with the sealing chamber far from the steam inlet side.
[0025] In a second aspect, an embodiment of the present disclosure further provides a steam turbine steam seal, including: a front steam seal of the steam turbine;
[0026] The front steam seal includes the steam seal body as described above;
[0027] The front steam seal is installed on the steam turbine body.
[0028] In a third aspect, an embodiment of the present disclosure further provides a steam turbine steam seal, including: a rear steam seal of the steam turbine;
[0029] The rear steam seal includes the steam seal body as described above;
[0030] The rear steam seal is installed on the steam turbine body.
[0031] The beneficial effects of the present utility model are as follows. After the lower steam seal body is restricted, the upper steam seal body is improved by increasing the number of steam inlet ports to meet the demand for steam seal steam volume, ensuring the tightness of the vacuum inside the steam turbine and guaranteeing the safe operation of the steam turbine. At the same time, by adding a steam volume increasing mechanism to the existing steam seal body and drilling holes in the steam seal body to form steam inlet ports, the total area of the drilled holes is set according to the required flow area for steam supply, so as to determine the number of drilled holes, thus eliminating the need to increase the number of additional steam inlet pipes and making the structure of the steam seal body more compact.
[0032] Other features and advantages of the present utility model will be described in the subsequent description. Moreover, some of them will become apparent from the description or be understood by implementing the present utility model. The objectives and other advantages of the present utility model are achieved and obtained by the structures specifically pointed out in the description, claims, and drawings.
[0033] To make the above objectives, features, and advantages of the present utility model more obvious and understandable, specific preferred embodiments are hereby given in conjunction with the accompanying drawings and described in detail as follows. Description of the Drawings
[0034] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0035] Figure 1 It is a top view of the steam seal body provided by an embodiment of the present disclosure.
[0036] Figure 2 It is a cross-sectional view of the steam seal body provided by an embodiment of the present disclosure.
[0037] In the figure: 100, steam seal body; 110, side wall; 120, bottom wall; 130, steam inlet port; 200, steam volume increasing mechanism; 210, chamber cover; 211, top plate; 212, first side plate; 213, second side plate; 214, third side plate; 220, opening; 300, steam inlet pipe. Detailed Embodiments
[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present utility model belong to the scope of protection of the present utility model.
[0039] It has been found through research that during the unit transformation of a steam turbine, some transformation schemes will force the steam inlet pipe and the flow area at the lower part of the gland body to shrink, resulting in insufficient gland steam quantity and easy leakage of air into the steam turbine, unqualified vacuum tightness, and adverse effects on the safe and economic operation of the steam turbine.
[0040] Based on the above research, the embodiments of the present disclosure provide a gland body and a steam turbine. After the lower gland body is restricted, the upper gland body is improved to increase the number of steam inlets to meet the demand for gland steam quantity, ensure the vacuum tightness inside the steam turbine, and ensure the safe operation of the steam turbine.
[0041] Regarding the defects existing in the above solutions, they are all the results obtained by the inventors through practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed by the present disclosure in this article for the above problems should all be the contributions made by the inventors to the present disclosure during the process of the present disclosure.
[0042] The following will describe in detail some embodiments of the present invention with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.
[0043] See Figure 1 , Figure 1 which shows a front view of the gland body. The gland body includes: a gland body main body 100 and at least one steam quantity increasing mechanism 200; the steam quantity increasing mechanism 200 is fixedly arranged on the gland body main body 100; the gland body main body 100 is provided with at least one steam inlet; the steam quantity increasing mechanism 200 is communicated with the gland body main body 100 through the corresponding steam inlet; the steam quantity increasing mechanism 200 is communicated with an external steam inlet pipe 300. After the lower gland body is restricted, the upper gland body is improved to increase the number of steam inlets to meet the demand for gland steam quantity, ensure the vacuum tightness inside the steam turbine, and ensure the safe operation of the steam turbine.
[0044] It should be noted that the gland body main body 100 is provided with at least two sealing cavities along the circumferential direction; the steam inlet is communicated with the sealing cavity far from the steam inlet side. By setting the sealing cavities to form multiple layers of seals, the vacuum tightness inside the steam turbine is further ensured, and the safe operation of the steam turbine is guaranteed.
[0045] Please refer to Figure 1 and Figure 2, in some embodiments, the steam quantity increasing mechanism 200 includes a chamber cover 210; the chamber cover 210 is fixedly arranged on the steam inlet, and forms a steam inlet chamber with the side wall 110 and the bottom wall 120 of the steam seal body 100; an opening 220 adapted to be communicated with an external steam inlet pipe is formed at the top of the steam inlet chamber. By adding the chamber cover 210 to the existing steam seal body to form a steam inlet chamber, the number of additional steam inlet pipes 300 does not need to be increased, and the structure of the steam seal body is made more compact.
[0046] Specifically, the chamber cover 210 includes a top plate 211, a first side plate 212, a second side plate 213 and a third side plate 214; the first side plate 212, the second side plate 213, the third side plate 214, the top plate 211 and the side wall 110 and the bottom wall 120 of the steam seal body 100 enclose to form a steam inlet chamber. The top plate 211, the first side plate 212, the second side plate 213 and the third side plate 214 are connected to the steam seal body 100 by welding. The welding is carried out in sections, stopping to cool down after welding a section and then continuing to weld to avoid deformation of the steam seal body 100.
[0047] Preferably, an opening 220 adapted to be communicated with an external steam inlet pipe is formed on the top plate 211.
[0048] Please continue to refer to Figure 1 , in some embodiments, the number of the steam quantity increasing mechanisms 200 is two; the two steam quantity increasing mechanisms 200 are respectively arranged on both sides of the steam seal body 100 and are communicated with the steam seal body 100 through corresponding steam inlets 130. By respectively arranging the two steam quantity increasing mechanisms 200 on the steam seal body 100, the steam inlet is made more uniform.
[0049] Please refer to Figure 2 , in some embodiments, the angle α between the steam inlet and the side wall 110 of the steam seal body 100 is an acute angle. By arranging the steam inlet obliquely, the resistance of the steam seal steam entering the steam seal body 100 is reduced.
[0050] In some embodiments, the range of the angle α is 5 - 15°. The angle α is set according to the actual situation.
[0051] Please refer to Figure 1 , in some embodiments, the number of the steam inlets communicated with each steam quantity increasing mechanism 200 is 3, and the 3 steam inlets are arranged along the circumferential direction of the steam seal body 100.
[0052] At least one embodiment also provides a steam turbine steam seal, including: a front steam seal of the steam turbine; the front steam seal includes the steam seal body as described above; the front steam seal is installed on the steam turbine body.
[0053] At least one embodiment further provides a steam turbine gland, comprising: a rear steam turbine gland; the rear gland includes the gland body as described above; the rear gland is installed on the steam turbine body.
[0054] In summary, the present invention provides a steam turbine gland body, wherein the gland body includes: a gland body 100 and at least one steam quantity increasing mechanism 200; the steam quantity increasing mechanism 200 is fixedly arranged on the gland body 100; the gland body 100 is provided with at least one steam inlet; the steam quantity increasing mechanism 200 communicates with the gland body 100 through the corresponding steam inlet; the steam quantity increasing mechanism 200 communicates with an external steam inlet pipe 300. After the lower gland body is restricted, the upper gland body is improved to increase the number of steam inlets to meet the demand for gland steam quantity, ensuring the tightness of the vacuum inside the steam turbine and ensuring the safe operation of the steam turbine. At the same time, by adding a steam quantity increasing mechanism 200 to the existing gland body and drilling holes in the gland body to form steam inlets, the total area of the drilled holes is set according to the required flow area for steam supply to determine the number of drilled holes, so that there is no need to increase the number of additional steam inlet pipes 300, making the structure of the gland body more compact.
[0055] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.
[0056] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, terms such as "first", "second", and other numerical terms used herein do not imply an order or sequence unless clearly indicated in the text. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or section discussed above may be referred to as the second element, component, region, layer, or section.
[0057] Spatially relative terms, such as "inner", "outer", "beneath", "below", "lower", "above", "upper", etc., may be used herein for ease of description to describe the relationship of one element or feature to another element or feature as illustrated in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, an element described as "beneath" or "below" another element or feature will then be oriented "above" the other element or feature. Thus, the exemplary term "beneath" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein are to be interpreted accordingly.
[0058] In the foregoing discussion, unless otherwise indicated, when used to describe a numerical value, the terms "about", "approximately", "substantially", etc. mean a variation of + / −10% of that value.
[0059] Inspired by the above-described ideal embodiments of the present utility model, through the above description, relevant workers can, without departing from the technical idea of the present utility model, make various changes and modifications. The technical scope of the present utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.
Claims
1. A gland seal body, characterized in that, include: A steam seal body and at least one steam volume increasing mechanism; The steam volume increasing mechanism is fixedly arranged on the steam seal body; The steam seal body is provided with at least one steam inlet; The steam volume increasing mechanism is connected to the steam seal body through the corresponding steam inlet; The steam volume increasing mechanism is communicated with an external steam inlet pipe.
2. The steam seal body according to claim 1, characterized in that: The steam volume increasing mechanism includes a chamber cover; The chamber cover is fixedly arranged on the steam inlet, and forms a steam inlet cavity with the side wall and the bottom wall of the steam seal body; The top of the steam inlet cavity is provided with an opening suitable for communicating with an external steam inlet pipe.
3. The steam seal body according to claim 2, characterized in that: The chamber cover comprises a top plate, a first side plate, a second side plate and a third side plate; The first side plate, the second side plate, the third side plate, the top plate and the side wall and the bottom wall of the steam seal body are combined to form a steam inlet cavity.
4. The steam seal body according to claim 3, characterized in that: The top plate is provided with an opening suitable for communicating with an external steam inlet pipe.
5. The steam seal body according to claim 1, characterized in that: The number of the steam volume increasing mechanisms is two; The two steam volume increasing mechanisms are respectively arranged on both sides of the steam seal body and are connected with the steam seal body through corresponding steam inlets.
6. The steam seal body according to claim 1, characterized in that: An angle α between the steam inlet and the side wall of the steam seal body is an acute angle.
7. The steam seal body according to claim 1, characterized in that: The number of the steam inlets connected to each of the steam volume increasing mechanisms is 3, and the 3 steam inlets are arranged along the circumference of the steam seal body.
8. The steam seal body according to claim 1, characterized in that: The steam seal body is provided with at least two sealing cavities along the circumferential direction; The steam inlet is communicated with a sealing cavity away from the steam inlet side.
9. A steam turbine gland, characterized in that, include: Steam turbine front steam seal; The front steam seal comprises a steam seal body as claimed in any one of claims 1 to 8; The front steam seal is installed on the steam turbine body.
10. A steam turbine gland, characterized in that, include: Steam turbine rear steam seal; The rear steam seal comprises a steam seal body as claimed in any one of claims 1 to 8; The rear steam seal is installed on the steam turbine body.