Airtight structure based on steam turbine

Abstract

The utility model discloses an airtight structure based on a steam turbine, which is characterized in that the number of bearing boxes is two, and the two bearing boxes are oppositely arranged; the two ends of the rotating shaft are respectively connected with one bearing box; the steam turbine is arranged between the two bearing boxes, the steam turbine is connected with the rotating shaft, and the steam turbine is used for driving the rotating shaft to rotate around the rotating center of the rotating shaft; the rotating shaft is sleeved with the airtight assembly, an airtight channel is formed between the airtight assembly and the rotating shaft, an opening is formed in the side, close to the rotating shaft, of the airtight assembly, the opening is formed around the rotating shaft, and the opening and / or the airtight channel are / is used for gas to pass through; the airtight assembly is arranged between the steam turbine and the bearing box. Through the arrangement of the airtight channel, the airtight assembly and the opening, gas can be blown to the rotating shaft, so that steam is prevented from moving along the rotating shaft, and the phenomenon that water is contained in oil due to the fact that the steam enters the bearing box is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbines, in particular to an airtight structure based on steam turbines. Background Art

[0002] During the operation of the steam turbine, the shaft seal system is a key component to ensure that the steam inside the steam turbine does not leak out and the external air does not leak in. The shaft seal system usually includes components such as the shaft seal, the shaft seal steam chamber, and the shaft seal cooler, which together form a relatively closed environment to reduce steam leakage and air infiltration.

[0003] However, in actual operation, due to the complexity of the shaft seal system and the particularity of the working environment, shaft seal steam leakage often occurs. When the shaft seal steam leakage is large, the leaked steam will enter the bearing box along the rotating shaft, causing the lubricating oil in the bearing box to mix with water, forming the phenomenon of water in the oil.

[0004] Water in oil has a serious impact on the safe operation of steam turbines. First, water will reduce the lubricating performance of the lubricating oil, causing increased wear of the bearings and shortening the service life of the bearings. Second, the mixture of water and lubricating oil will emulsify at high temperatures, further reducing the performance of the lubricating oil and may even cause ablation of the bearings. In addition, water in the oil will increase the humidity in the bearing box and accelerate the corrosion and aging of the components in the bearing box. Utility Model Content

[0005] In view of the above problems, the present application provides an airtight structure based on a steam turbine to avoid oil-water mixing.

[0006] To achieve the above objectives, the present application provides an airtight structure based on a steam turbine, comprising:

[0007] Bearing boxes, there are two bearing boxes, and the two bearing boxes are arranged opposite to each other;

[0008] A rotating shaft, both ends of which are rotatably connected to one of the bearing boxes;

[0009] A steam turbine, the steam turbine is placed between the two bearing boxes and connected to the rotating shaft, and the steam turbine is used to drive the rotating shaft to rotate around its rotation center;

[0010] An airtight component, wherein the airtight component is sleeved on the rotating shaft, and an airtight passage is provided between the airtight component and the rotating shaft, an opening is provided on a side of the airtight component close to the rotating shaft, the opening is provided around the rotating shaft, and the opening and / or the airtight passage are used for gas to pass through; the airtight component is placed between the steam turbine and the bearing box.

[0011] In the technical solution of the embodiment of the present application, the airtight component includes: an airtight chamber and a bracket; the airtight chamber has an airtight cavity built therein, and the opening is connected to the airtight cavity;

[0012] The bracket is connected to the airtight chamber, and the bracket is used to fix the airtight chamber.

[0013] In the technical solution of the embodiment of the present application, the airtight chamber is also provided with an air inlet hole which is connected to the airtight cavity.

[0014] The technical solution of the embodiment of the present application further includes: a gas source, which is connected to the gas inlet hole, and the gas source is used to transport gas to the airtight cavity through the gas inlet hole.

[0015] In the technical solution of the embodiment of the present application, the gas source is an air pump.

[0016] The technical solution of the embodiment of the present application also includes: a control unit;

[0017] The control unit is electrically connected to the steam turbine and the gas source, and is used to control the start or shut down of the gas source.

[0018] The technical solution of the embodiment of the present application also includes: a valve, which is placed on the pipeline connecting the gas source and the gas inlet, and the valve is used to control the gas flow through the pipeline.

[0019] In the technical solution of the embodiment of the present application, the steam turbine includes: a rotor and a casing, the rotor is fixedly sleeved on the rotating shaft, the rotor is used to drive the rotating shaft to rotate, and the casing cover is arranged on the rotor.

[0020] Different from the prior art, the above technical solution allows gas to be blown onto the rotating shaft through the airtight passage, the airtight component and the opening on the airtight component to prevent steam from moving along the rotating shaft, thereby avoiding steam from entering the bearing box and causing water in the oil.

[0021] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0023] Figure 1 A structural diagram of an airtight assembly between the steam turbine and one of the bearing boxes is provided for a specific implementation;

[0024] Figure 2 A structural diagram of an airtight assembly between the steam turbine and the two bearing boxes is provided for a specific implementation;

[0025] Figure 3 It is a structural diagram of the airtight component described in the specific implementation method;

[0026] Figure 4 A gas flow diagram of the airtight component described in the specific implementation manner;

[0027] Figure 5 This is a gas source structure diagram for a specific implementation method.

[0028] Description of reference numerals:

[0029] 10. bearing box; 20. rotating shaft; 30. steam turbine; 40. airtight component; 50. air source; 60. valve; 70. airtight passage;

[0030] 41. Airtight chamber; 42. Bracket; 43. Airtight cavity; 44. Opening; 45. Air inlet. DETAILED DESCRIPTION

[0031] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0033] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0034] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0035] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0036] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0037] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0038] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0039] See also Figures 1 to 5 This embodiment provides an airtight structure based on a steam turbine 30, comprising:

[0040] A bearing box 10, wherein there are two bearing boxes 10, and the two bearing boxes 10 are arranged opposite to each other;

[0041] A rotating shaft 20, wherein both ends of the rotating shaft 20 are rotatably connected to one of the bearing boxes 10;

[0042] A steam turbine 30, the steam turbine 30 is placed between the two bearing boxes 10, and the steam turbine 30 is connected to the rotating shaft 20, and the steam turbine 30 is used to drive the rotating shaft 20 to rotate around its rotation center;

[0043] An airtight component 40, wherein the airtight component 40 is sleeved on the rotating shaft 20, and an airtight passage 70 is provided between the airtight component 40 and the rotating shaft 20, an opening 44 is provided on a side of the airtight component 40 close to the rotating shaft 20, and the opening 44 is provided around the rotating shaft 20, and the opening 44 and / or the airtight passage 70 are used for gas to pass through; the airtight component 40 is placed between the steam turbine 30 and the bearing box 10.

[0044] There are two bearing boxes 10, which are arranged opposite to each other; a cavity for accommodating the end of the rotating shaft 20 is arranged in the middle of the bearing box 10, and the rotating shaft 20 is placed in the cavity of the bearing box 10. The bearing box 10 is used to support the rotating shaft 20 to ensure the stable operation of the steam turbine 30. Furthermore, in order to ensure the smooth operation of the bearing box 10, the bearing box 10 is coated with lubricating oil and / or is provided with an oil circuit to reduce the friction in the bearing box 10 during operation.

[0045] The two ends of the rotating shaft 20 are respectively connected to the two bearing boxes 10. Specifically, the ends of the rotating shaft 20 are placed in the cavities of the bearing boxes 10. The rotating shaft 20 is rotatably connected to the two bearing boxes 10.

[0046] The steam turbine 30 is located between the two bearing boxes 10, and the steam turbine 30 is connected to the rotating shaft 20. The steam turbine 30 is used to drive the rotating shaft 20 to rotate around its rotation center, so that the rotating shaft 20 can perform work externally.

[0047] The airtight component 40 is sleeved on the rotating shaft 20, and the airtight passage 70 is provided between the airtight component 40 and the rotating shaft 20. The airtight passage 70 is annular and arranged around the rotating shaft 20. The airtight component 40 is provided with the opening 44 on one side close to the rotating shaft 20 (that is, the airtight component 40 has the opening 44 on one side close to the airtight passage 70, and the opening 44 is arranged toward the rotating shaft 20), and the opening 44 is arranged around the rotating shaft 20, and the opening 44 is used to blow gas toward the rotating shaft 20.

[0048] It should also be noted that the airtight component 40 is located between the steam turbine 30 and the bearing housing 10, and the airtight component 40 is used to prevent leaked steam from entering the bearing housing 10. Specifically, when the steam turbine 30 leaks steam, the steam will move along the rotating shaft 20, and the airtight component 40 will blow air toward the rotating shaft 20 to form an air curtain to block the steam. At the same time, the airflow generated by the air curtain moves along the rotating shaft 20 toward the steam turbine 30 to further block the steam.

[0049] During the normal operation of the steam turbine 30, due to the existence of the shaft seal system, most of the steam is effectively blocked inside the steam turbine 30 and will not leak to the outside. However, when the shaft seal system leaks, especially when the leakage is large, the leaked steam will flow along the rotating shaft 20 toward the bearing box 10. At this time, since the opening 44 is provided on the side of the airtight component 40 close to the rotating shaft 20, air is blown outward through the opening 44, and the gas moves along the rotating shaft 20. The leaked steam will be blocked by the gas blown out from the airtight channel 70 instead of directly entering the bearing box 10, thereby preventing steam from entering the bearing box 10 and causing water in the oil.

[0050] Of course, in other embodiments, the airtight component 40 can also be used to absorb steam.

[0051] Different from the prior art, the above technical solution allows gas to be blown onto the rotating shaft 20 through the arrangement of the airtight channel 70, the airtight component 40 and the opening 44 on the airtight component 40, so as to prevent steam from moving along the rotating shaft 20, thereby preventing steam from entering the bearing box 10 and causing water in the oil.

[0052] According to some embodiments of the present application, referring to Figures 3 to 5 The airtight component 40 includes: an airtight chamber 41 and a bracket 42; the airtight chamber 41 has an internal airtight cavity 43, and the opening 44 is in communication with the airtight cavity 43;

[0053] The bracket 42 is connected to the airtight chamber 41, and the bracket 42 is used to fix the airtight chamber 41. In some embodiments, the airtight chamber 41 is further provided with an air inlet 45 communicating with the airtight cavity 43.

[0054] The airtight chamber 41 has the airtight cavity 43 built therein, and the airtight passage 70 is provided between the airtight cavity 43 and the rotating shaft 20 to prevent leaked steam from entering the bearing box 10. The airtight chamber 41 is provided with an opening 44 on one side close to the rotating shaft 20, and the opening 44 is arranged around the rotating shaft 20, and the opening 44 is communicated with the airtight cavity 43 to facilitate gas passage.

[0055] The bracket 42 is connected to the airtight chamber 41 , and the bracket 42 is used to fix the position of the airtight chamber 41 to ensure its stability during the operation of the steam turbine 30 .

[0056] The air inlet 45 is provided through the airtight chamber 41, and the air inlet 45 is in communication with the airtight chamber 43. During the operation of the steam turbine 30, a high-speed airflow is introduced into the airtight chamber 43 through the air inlet, so that the gas is ejected from the opening 44 to the rotating shaft 20 to block the steam; of course, in another embodiment, if the pressure in the airtight chamber 43 decreases, the air inlet extracts the gas in the airtight chamber 43, and the outside air can enter the airtight chamber 43 through the opening 44 to keep the airtight chamber 43 from inhaling steam.

[0057] According to some embodiments of the present application, referring to Figures 3 to 5 , further comprising: an air source 50, the air source 50 being in communication with the air inlet 45, the air source 50 being used to deliver gas to the airtight cavity 43 through the air inlet 45. In some embodiments, the air source 50 is an air pump.

[0058] According to some embodiments of the present application, it further includes: a control unit;

[0059] The control unit is electrically connected to the steam turbine 30 and the gas source 50 , and is used to control the gas source 50 to start or shut down.

[0060] The control unit is used to control the opening and closing of the gas source 50. When the steam turbine 30 is operating, the gas source 50 can be opened synchronously. Of course, in other embodiments, a sensor can be set to detect whether there is a gas leakage. If there is a gas leakage, the gas source 50 is started, and if there is no gas leakage, the gas source 50 is closed.

[0061] According to some embodiments of the present application, referring to Figure 1 to Figure 2 , further comprising: a valve 60, wherein the valve 60 is disposed on a pipeline connecting the gas source 50 and the gas inlet, and the valve 60 is used to control the gas flow through the pipeline.

[0062] The valve 60 is used to control the opening and closing of the gas source 50 , and the gas source 50 can be opened synchronously when the steam turbine 30 is operating.

[0063] According to some embodiments of the present application, the steam turbine 30 includes: a rotor and a casing, the rotor is fixedly sleeved on the rotating shaft 20, the rotor is used to drive the rotating shaft 20 to rotate, and the casing cover is arranged on the rotor.

[0064] The rotor includes a plurality of blades, which are fixedly connected to the rotating shaft 20 and arranged in an array along the rotating shaft 20. The plurality of blades are pushed by steam, thereby driving the rotating shaft 20 to rotate.

[0065] The shell is an outer shell for protecting the rotor, and the shell can withstand high temperature and high pressure steam.

[0066] In some embodiments, a stationary blade grid (nozzle) is also included. The stationary blade grid is located around the rotor. The stationary blade grid converts high-temperature and high-pressure steam into high-speed airflow, and guides the airflow to impact the blades of the rotor, driving the rotor to rotate, and then driving the rotating shaft 20 to rotate.

[0067] The steam inlet part of the steam turbine 30 also includes a main steam pipeline and a regulating valve, which control the flow rate and pressure of steam entering the steam turbine 30. The steam exhaust part includes a condenser and a steam exhaust pipeline, which is used to discharge the steam after work.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An airtight structure based on a steam turbine, characterized in that: include: Bearing boxes, there are two bearing boxes, and the two bearing boxes are arranged opposite to each other; A rotating shaft, both ends of which are connected to one of the bearing boxes respectively; A steam turbine, the steam turbine is placed between the two bearing boxes and connected to the rotating shaft, and the steam turbine is used to drive the rotating shaft to rotate around its rotation center; An airtight component, wherein the airtight component is sleeved on the rotating shaft, and an airtight passage is provided between the airtight component and the rotating shaft. An opening is provided on a side of the airtight component close to the rotating shaft, and the opening is provided around the rotating shaft. The opening and the airtight passage are used for gas to pass through; the airtight component is placed between the steam turbine and the bearing box.

2. The airtight structure based on a steam turbine according to claim 1, characterized in that: The airtight component comprises: an airtight chamber and a bracket; the airtight chamber has an airtight cavity built therein, and the opening is in communication with the airtight cavity; The bracket is connected to the airtight chamber, and the bracket is used to fix the airtight chamber.

3. The airtight structure based on a steam turbine according to claim 2, characterized in that: The airtight chamber is also provided with an air inlet hole communicated with the airtight cavity.

4. The airtight structure based on a steam turbine according to claim 3, characterized in that: Also includes: An air source is connected to the air inlet, and is used to transport gas to the airtight cavity through the air inlet.

5. The airtight structure based on a steam turbine according to claim 4, characterized in that: The air source is an air pump.

6. The airtight structure based on a steam turbine according to claim 4, characterized in that: Also includes: Control unit; The control unit is electrically connected to the steam turbine and the gas source, and is used to control the start or shut down of the gas source.

7. The airtight structure based on a steam turbine according to claim 4, characterized in that: Also includes: A valve is placed on a pipeline connecting the gas source and the gas inlet, and the valve is used to control the gas flow through the pipeline.

8. The airtight structure based on a steam turbine according to claim 1, characterized in that: The steam turbine comprises: a rotor and a casing. The rotor is fixedly sleeved on the rotating shaft. The rotor is used to drive the rotating shaft to rotate. The casing cover is arranged on the rotor.

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