F class gas turbine combined cycle steam turbine intermediate pressure inner cylinder cast steel part

Abstract

This utility model discloses a cast steel inner cylinder for an F-class gas turbine combined cycle turbine, comprising an upper cast steel part and a lower cast steel part. The upper cast steel part includes an upper alloy steel casting and an upper stainless steel casting, with the upper stainless steel casting fitted onto the outer surface of the upper alloy steel casting. The lower cast steel part includes a lower alloy steel casting and a lower stainless steel casting. The upper and lower alloy steel castings are combined to form an alloy steel inner cylinder casting. An alloy steel inner cylinder cavity is provided in the middle of the casting, containing multiple blade grooves with several annular lubrication oil channels between them. A front bearing seat is provided at the front end of the inner cylinder casting, containing an annular lubrication oil channel for the front bearing. A rear bearing seat is provided at the rear end of the inner cylinder casting, containing an annular lubrication oil channel for the rear bearing. This technical solution features a reasonable structural design, low manufacturing cost, good lubrication oil storage effect, and good practicality.

Description

Technical Field

[0001] This utility model relates to the field of gas turbine technology, specifically to a cast steel part for the intermediate pressure inner cylinder of an F-class gas turbine combined cycle steam turbine. Background Technology

[0002] F-class gas turbines are a type of internal combustion engine. They are machines that use fuel (mainly natural gas) to burn with air to produce gas that drives blades to do work. They are classified into E-class, F-class, and the most advanced H-class according to the combustion chamber temperature.

[0003] The primary function of the intermediate-pressure inner cylinder in a gas turbine is to form a sealed pressure vessel, ensuring efficient steam flow within the turbine and withstanding various forces and thermal stresses.

[0004] Existing gas turbines typically employ a double-cylinder design for their intermediate-pressure inner cylinder to cope with high-temperature and high-pressure conditions. The inner cylinder splits horizontally at a mid-plane, forming upper and lower parts, and is axially positioned by a boss on the outer cylinder and an annular groove on the inner cylinder. However, the cast steel components of the intermediate-pressure inner cylinders in existing gas turbines are made of alloy steel, which is costly to manufacture. Furthermore, the structural design of the cast steel components in the intermediate-pressure inner cylinders of existing gas turbines is unreasonable, resulting in poor lubrication oil storage and insufficient lubrication of the blades and rotor during operation. This leads to high friction and low turbine efficiency. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a cast steel part for the intermediate pressure inner cylinder of an F-class gas turbine combined cycle turbine with reasonable structural design, low manufacturing cost, good lubricating oil storage effect and good practicality.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a cast steel part for the intermediate pressure inner cylinder of an F-class gas turbine combined cycle turbine, comprising an upper cast steel part and a lower cast steel part. The upper cast steel part includes an upper alloy steel casting and an upper stainless steel casting. The upper stainless steel casting is fitted onto the outer surface of the upper alloy steel casting, and a plurality of first fasteners are provided between the upper stainless steel casting and the upper alloy steel casting. The lower cast steel part includes a lower alloy steel casting and a lower stainless steel casting. The lower stainless steel casting is fitted onto the outer surface of the lower alloy steel casting, and a plurality of second fasteners are provided between the lower stainless steel casting and the lower alloy steel casting.

[0007] The upper alloy steel casting and the lower alloy steel casting are combined to form an alloy steel inner cylinder casting. An alloy steel inner cylinder cavity is provided in the middle of the inner cylinder casting. Multiple blade grooves are provided within the inner cylinder cavity, and these blade grooves are parallel to each other. Several annular lubrication channels are provided between the blade grooves. A front bearing seat is provided at the front end of the alloy steel inner cylinder casting, and an annular lubrication channel for the front bearing is provided within the front bearing seat. A rear bearing seat is provided at the rear end of the alloy steel inner cylinder casting, and an annular lubrication channel for the rear bearing is provided within the rear bearing seat.

[0008] The upper stainless steel casting has a first connecting protrusion integrally provided on both the left and right ends, and the lower stainless steel casting has a second connecting protrusion integrally provided on both the left and right ends. A plurality of third fasteners are provided between the first connecting protrusions and the second connecting protrusions, and the first connecting protrusions and the second connecting protrusions are connected and fixed by the third fasteners.

[0009] The present invention is further configured such that: the front bearing housing includes a front upper bearing housing and a front lower bearing housing; the rear end of the front upper bearing housing is integrally formed with the front end of the upper alloy steel casting; a first lubricating oil filling hole is vertically provided on the top of the front upper bearing housing, and a first plug is provided at the upper end of the first lubricating oil filling hole; the rear end of the front lower bearing housing is integrally formed with the front end of the lower alloy steel casting; a first lubricating oil drain hole is provided at the bottom of the front lower bearing housing, and a second plug is provided at the lower end of the first lubricating oil drain hole.

[0010] The present invention is further configured such that: the rear bearing housing includes an upper rear bearing housing and a lower rear bearing housing; the front end of the upper rear bearing housing is integrally formed with the rear end of the upper alloy steel casting; a second lubricating oil filling hole is vertically provided on the top of the upper rear bearing housing; and a third plug is provided at the upper end of the second lubricating oil filling hole; the front end of the lower rear bearing housing is integrally formed with the rear end of the lower alloy steel casting; a second lubricating oil drain hole is provided at the bottom of the lower rear bearing housing; and a fourth plug is provided at the lower end of the second lubricating oil drain hole.

[0011] The present invention is further configured such that: the first fastener is a stainless steel bolt, a plurality of first stepped bolt through holes are provided on the outer surface of the upper stainless steel casting, and a first threaded blind hole is provided on the outer surface of the upper alloy steel casting aligned with each first stepped bolt through hole; after the head of each first fastener passes through the first stepped bolt through hole, it is fixed by threaded connection with the aligned first threaded blind hole.

[0012] The present invention is further configured such that: the second fastener is a stainless steel bolt, and a plurality of second-step bolt through holes are provided on the outer surface of the lower stainless steel casting; a second threaded blind hole is provided on the outer surface of the lower alloy steel casting at the position of each second-step bolt through hole; and the head of each second fastener passes through the second-step bolt through hole and is fixed by threaded connection with the aligned second threaded blind hole.

[0013] The present invention is further configured such that: the first plug and the second plug are both stainless steel plugs, and the lower end of the first plug is threadedly connected to the upper port of the first lubricating oil filling hole, and the upper end of the second plug is threadedly connected to the lower port of the first lubricating oil drain hole; the third plug and the fourth plug are both stainless steel plugs, and the lower end of the third plug is threadedly connected to the upper port of the second lubricating oil filling hole, and the upper end of the fourth plug is threadedly connected to the lower port of the second lubricating oil drain hole.

[0014] The beneficial effects of this utility model are as follows: Compared with the prior art, the structure of this utility model is reasonable. The upper cast steel part includes an upper alloy steel casting and an upper stainless steel casting, with the upper stainless steel casting fitted on the outer surface of the upper alloy steel casting. The lower cast steel part includes a lower alloy steel casting and a lower stainless steel casting, with the lower stainless steel casting fitted on the outer surface of the lower alloy steel casting. The upper alloy steel casting and the lower alloy steel casting are combined to form an alloy steel inner cylinder casting. The cost of stainless steel material is lower than that of alloy steel. The design of the upper and lower stainless steel castings can effectively reduce manufacturing costs and is easy to maintain. Both the upper and lower stainless steel castings are fastened with stainless steel bolts and can be replaced.

[0015] In addition, several annular lubrication channels are provided between the blade slots; the front bearing housing is provided with a front bearing annular lubrication channel, and the rear bearing housing is provided with a rear bearing annular lubrication channel; a certain amount of lubricating oil can be stored in the annular lubrication channels, the front bearing annular lubrication channel, and the rear bearing annular lubrication channel. When the steam turbine is working, the lubricating oil will flow to each blade and rotor for lubrication, ensuring sufficient lubrication of the steam turbine, reducing friction, thereby improving the efficiency of the steam turbine and making it practical.

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0018] Figure 2 This is an exploded view of an embodiment of the present invention;

[0019] Figure 3 This is a cross-sectional schematic diagram of the cast steel part in an embodiment of this utility model.

[0020] Figure 4 This is a cross-sectional schematic diagram of the cast steel part according to an embodiment of the present invention. Detailed Implementation

[0021] In the description of this embodiment, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] See Figures 1 to 4 This utility model discloses a cast steel part for the intermediate pressure inner cylinder of an F-class gas turbine combined cycle turbine, comprising an upper cast steel part 1 and a lower cast steel part 2. The upper cast steel part 1 includes an upper alloy steel casting 11 and an upper stainless steel casting 12. The upper stainless steel casting 12 is fitted onto the outer surface of the upper alloy steel casting 11, and a plurality of first fasteners 3 are provided between the upper stainless steel casting 12 and the upper alloy steel casting 11. The lower cast steel part 2 includes a lower alloy steel casting 21 and a lower stainless steel casting 22. The lower stainless steel casting 22 is fitted onto the outer surface of the lower alloy steel casting 21, and a plurality of second fasteners 4 are provided between the lower stainless steel casting 22 and the lower alloy steel casting 21.

[0023] The upper alloy steel casting 11 and the lower alloy steel casting 21 are combined to form an alloy steel inner cylinder casting. An alloy steel inner cylinder cavity is provided in the middle of the alloy steel inner cylinder casting. Multiple blade grooves 5 are provided in the alloy steel inner cylinder cavity. The blade grooves 5 are parallel to each other, and several annular lubricating oil passages 6 are provided between the blade grooves 5. A front bearing seat is provided at the front end of the alloy steel inner cylinder casting. A front bearing annular lubricating oil passage 7 is provided in the front bearing seat. A rear bearing seat is provided at the rear end of the alloy steel inner cylinder casting. A rear bearing annular lubricating oil passage is provided in the rear bearing seat.

[0024] The upper stainless steel casting 12 has a first connecting protrusion 121 integrally provided on both the left and right ends, and the lower stainless steel casting 22 has a second connecting protrusion 221 integrally provided on both the left and right ends. A plurality of third fasteners are provided between the first connecting protrusion 121 and the second connecting protrusion 221, and the first connecting protrusion 121 and the second connecting protrusion 221 are connected and fixed by the third fasteners.

[0025] Preferably, the third fasteners are all stainless steel bolts, and the number of third fasteners is four or more. Multiple bolt through holes are provided on both the first connecting protrusion 121 and the second connecting protrusion 221, and the bolt through holes on the first connecting protrusion 121 are aligned with the bolt through holes on the second connecting protrusion 221. The first connecting protrusion 121 and the second connecting protrusion 221 are fastened together by the third fasteners. Five blade grooves 5 are provided, with the first three blade grooves being narrower and the last two being wider. The annular lubricating oil passage 6 is positioned between the two types of blade grooves with different widths.

[0026] To make the structural design of this utility model more reasonable, as a preferred embodiment, the front bearing housing includes a front upper bearing housing 13 and a front lower bearing housing 23. The rear end of the front upper bearing housing 13 is integrally formed with the front end of the upper alloy steel casting 11. A first lubricating oil filling hole 131 is vertically provided on the top of the front upper bearing housing 13, and a first plug 8 is provided at the upper port of the first lubricating oil filling hole 131. The rear end of the front lower bearing housing 23 is integrally formed with the front end of the lower alloy steel casting 21. A first lubricating oil drain hole 231 is provided at the bottom of the front lower bearing housing 23, and a second plug 9 is provided at the lower port of the first lubricating oil drain hole 231.

[0027] Preferably, the first plug 8 and the second plug 9 are both stainless steel plugs, and the lower end of the first plug 8 is threadedly connected to the upper port of the first lubricating oil filling hole 131, and the upper end of the second plug 9 is threadedly connected to the lower port of the first lubricating oil drain hole 231.

[0028] The rear bearing housing includes an upper rear bearing housing 14 and a lower rear bearing housing 24. The front end of the upper rear bearing housing 14 is integrally formed with the rear end of the upper alloy steel casting 11. A second lubricating oil filling hole 141 is vertically provided on the top of the upper rear bearing housing 14, and a third plug is provided at the upper end of the second lubricating oil filling hole 141. The front end of the lower rear bearing housing 24 is integrally formed with the rear end of the lower alloy steel casting 21. A second lubricating oil drain hole 241 is provided at the bottom of the lower rear bearing housing 24, and a fourth plug is provided at the lower end of the second lubricating oil drain hole 241.

[0029] Preferably, both the third and fourth plugs are stainless steel plugs, with the lower end of the third plug threadedly connected to the upper port of the second lubricating oil filling hole 141, and the upper end of the fourth plug threadedly connected to the lower port of the second lubricating oil drain hole 241.

[0030] The first fastener 3 is a stainless steel bolt. The outer surface of the upper stainless steel casting 12 has multiple first-step bolt through holes. The outer surface of the upper alloy steel casting 11 has a first threaded blind hole aligned with each of the first-step bolt through holes. The head of each first fastener 3 passes through the first-step bolt through hole and is then threadedly connected and fixed to the aligned first threaded blind hole. Preferably, the number of first-step bolt through holes is three or more.

[0031] The second fastener 4 is a stainless steel bolt. The outer surface of the lower stainless steel casting 22 has multiple second-step bolt through holes. The outer surface of the lower alloy steel casting 21 has a second threaded blind hole aligned with each second-step bolt through hole. The head of each second fastener 4 passes through the second-step bolt through hole and is fixed to the aligned second threaded blind hole via a threaded connection. Preferably, the number of second-step bolt through holes is three or more.

[0032] In practical applications, the upper cast steel part 1 includes an upper alloy steel casting 11 and an upper stainless steel casting 12. The upper stainless steel casting 12 is fitted onto the outer surface of the upper alloy steel casting 11. The lower cast steel part 2 includes a lower alloy steel casting 21 and a lower stainless steel casting 22. The lower stainless steel casting 22 is fitted onto the outer surface of the lower alloy steel casting 21. The upper alloy steel casting 11 and the lower alloy steel casting 21 are combined to form an alloy steel inner cylinder casting. The structure is reasonably designed. The cost of stainless steel is lower than that of alloy steel. The design of the upper stainless steel casting 12 and the lower stainless steel casting 22 can effectively reduce manufacturing costs and is easy to maintain. Both the upper stainless steel casting 12 and the lower stainless steel casting 22 are fastened with stainless steel bolts and can be replaced.

[0033] In addition, several annular lubrication channels 6 are provided between the blade slots 5; annular lubrication channels 7 for the front bearing are provided in the front bearing housing, and annular lubrication channels for the rear bearing are provided in the rear bearing housing; a certain amount of lubricating oil can be stored in the annular lubrication channels 6, the front bearing annular lubrication channel 7, and the rear bearing annular lubrication channel. When the turbine is working, the lubricating oil will flow to each blade and rotor for lubrication, ensuring sufficient lubrication of the turbine, reducing friction, thereby improving the turbine efficiency and making it practical.

[0034] The above description of the specific embodiments of this utility model is only used to further illustrate this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-essential improvements and adjustments made to this utility model by technical engineers in the art based on the above description of the utility model shall fall within the scope of protection of this utility model.

Claims

1. A cast steel inner cylinder component for an F-class gas turbine combined cycle turbine, comprising an upper cast steel component (1) and a lower cast steel component (2), characterized in that: The upper cast steel part (1) includes an upper alloy steel casting (11) and an upper stainless steel casting (12). The upper stainless steel casting (12) is fitted on the outer surface of the upper alloy steel casting (11), and a plurality of first fasteners (3) are provided between the upper stainless steel casting (12) and the upper alloy steel casting (11). The lower cast steel part (2) includes a lower alloy steel casting (21) and a lower stainless steel casting (22). The lower stainless steel casting (22) is fitted on the outer surface of the lower alloy steel casting (21), and a plurality of second fasteners (4) are provided between the lower stainless steel casting (22) and the lower alloy steel casting (21). The upper alloy steel casting (11) and the lower alloy steel casting (21) are combined to form an alloy steel inner cylinder casting. An alloy steel inner cylinder cavity is provided in the middle of the alloy steel inner cylinder casting. Multiple blade grooves (5) are provided in the alloy steel inner cylinder cavity. Each blade groove (5) is parallel to each other, and several annular lubricating oil channels (6) are provided between the blade grooves (5). A front bearing seat is provided at the front end of the alloy steel inner cylinder casting. An annular lubricating oil channel (7) for the front bearing seat is provided in the front bearing seat. A rear bearing seat is provided at the rear end of the alloy steel inner cylinder casting. An annular lubricating oil channel for the rear bearing seat is provided in the rear bearing seat. The upper stainless steel casting (12) has a first connecting protrusion (121) integrally provided on both the left and right ends, and the lower stainless steel casting (22) has a second connecting protrusion (221) integrally provided on both the left and right ends. A plurality of third fasteners are provided between the first connecting protrusion (121) and the second connecting protrusion (221), and the first connecting protrusion (121) and the second connecting protrusion (221) are connected and fixed by the third fasteners.

2. The cast steel part of the intermediate pressure inner cylinder of an F-class gas turbine combined cycle turbine according to claim 1, characterized in that: The front bearing housing includes a front upper bearing housing (13) and a front lower bearing housing (23). The rear end of the front upper bearing housing (13) is integrally formed with the front end of the upper alloy steel casting (11). A first lubricating oil filling hole (131) is vertically provided on the top of the front upper bearing housing (13), and a first plug (8) is provided at the upper end of the first lubricating oil filling hole (131). The rear end of the front lower bearing housing (23) is integrally formed with the front end of the lower alloy steel casting (21). A first lubricating oil drain hole (231) is provided at the bottom of the front lower bearing housing (23), and a second plug (9) is provided at the lower end of the first lubricating oil drain hole (231).

3. The cast steel part of the intermediate pressure inner cylinder of an F-class gas turbine combined cycle turbine according to claim 2, characterized in that: The rear bearing housing includes an upper rear bearing housing (14) and a lower rear bearing housing (24). The front end of the upper rear bearing housing (14) is integrally formed with the rear end of the upper alloy steel casting (11). A second lubricating oil filling hole (141) is vertically provided on the top of the upper rear bearing housing (14), and a third plug is provided at the upper port of the second lubricating oil filling hole (141). The front end of the lower rear bearing housing (24) is integrally formed with the rear end of the lower alloy steel casting (21). A second lubricating oil drain hole (241) is provided at the bottom of the lower rear bearing housing (24), and a fourth plug is provided at the lower port of the second lubricating oil drain hole (241).

4. The cast steel part of the intermediate pressure inner cylinder of an F-class gas turbine combined cycle turbine according to claim 3, characterized in that: The first fastener (3) is a stainless steel bolt. The outer surface of the upper stainless steel casting (12) is provided with a plurality of first stepped bolt through holes. The outer surface of the upper alloy steel casting (11) is provided with a first threaded blind hole aligned with each first stepped bolt through hole. After the head of each first fastener (3) passes through the first stepped bolt through hole, it is fixed by threaded connection with the aligned first threaded blind hole.

5. A cast steel intermediate-pressure inner cylinder component for an F-class gas turbine combined cycle turbine according to claim 4, characterized in that: The second fastener (4) is a stainless steel bolt. Multiple second-step bolt through holes are provided on the outer surface of the lower stainless steel casting (22). A second threaded blind hole is provided on the outer surface of the lower alloy steel casting (21) aligned with each second-step bolt through hole. After the head of each second fastener (4) passes through the second-step bolt through hole, it is fixed by threaded connection with the aligned second threaded blind hole.

6. A cast steel intermediate-pressure inner cylinder component for an F-class gas turbine combined cycle turbine according to claim 3 or 5, characterized in that: The first plug (8) and the second plug (9) are both stainless steel plugs. The lower end of the first plug (8) is threaded to the upper port of the first lubricating oil filling hole (131), and the upper end of the second plug (9) is threaded to the lower port of the first lubricating oil drain hole (231). The third plug and the fourth plug are both stainless steel plugs. The lower end of the third plug is threaded to the upper port of the second lubricating oil filling hole (141), and the upper end of the fourth plug is threaded to the lower port of the second lubricating oil drain hole (241).

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