A cast steel piece of an intermediate pressure main steam valve of a 150mw triple pressure condensing gas combined steam turbine

Abstract

This utility model discloses a cast steel part for the intermediate-pressure main steam valve of a 150MW three-pressure condensing combined steam turbine, including a cast steel valve body and a cast steel valve cover. One end of the cast steel valve body has a connecting channel. A positioning protrusion is positioned on the inner wall of the valve cavity, aligned with the connecting channel. A valve seat mounting groove and a bracket positioning groove are provided on the end face of the positioning protrusion aligned with the connecting channel. A valve body connecting protrusion is integrally provided on the inner end face of the valve body connecting protrusion. A valve core positioning bracket is integrally provided on the inner end face of the valve body connecting protrusion. Several positioning protrusions are integrally provided on the end of the valve core positioning bracket facing away from the cast steel valve cover. Each positioning protrusion is inserted into its aligned bracket positioning groove. The cast steel valve body and the cast steel valve cover are connected and fixed by fasteners. Several sealing ring mounting grooves are provided from the outside to the inside on the inner wall face of the connecting channel aligned with the valve body connecting protrusion. The above technical solution has a reasonable structural design, simple structure, easy assembly, reliable connection, long service life, and good practicality.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine technology, specifically to a cast steel part for the intermediate pressure main steam valve of a 150MW three-pressure condensing combined steam turbine. Background Technology

[0002] A steam turbine is a rotary prime mover that uses steam as its working fluid to convert thermal energy into mechanical energy. Its main function is to drive generators to produce electricity. The steam turbine's inlet and outlet are primarily controlled by the coordinated operation of various valves. However, the existing 150MW three-pressure condensing combined steam turbine's intermediate-pressure main steam valve has shortcomings: its structural design is unreasonable. Due to their complex structure, they are usually cast separately and then welded together to form a single structure. However, welding between two cast steel parts is troublesome, and the weld is prone to defects. During use, the weld is prone to cracking, which can even lead to complete breakage between the two cast steel parts. This results in a short service life for the valve body and poor practicality. Utility Model Content

[0003] 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 main steam valve of a 150MW three-pressure condensing combined steam turbine with reasonable structural design, simple structure, easy assembly, reliable connection, long service life and good practicality.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a cast steel part for the intermediate pressure main steam valve of a 150MW three-pressure condensing combined steam turbine, including a cast steel part for the valve body and a cast steel part for the valve cover. The cast steel part for the valve body is provided with a valve cavity. One end of the cast steel part for the valve body is provided with a connecting channel. The inner wall of the valve cavity is provided with a positioning protrusion aligned with the position of the connecting channel. The end face of the positioning protrusion aligned with the connecting channel is provided with a valve seat mounting groove and a bracket positioning groove. A valve body connecting protrusion is integrally provided on the inner end face of the valve cover cast steel part, a valve core positioning bracket is integrally provided on the inner end face of the valve body connecting protrusion, a valve core mounting cavity is provided in the valve core positioning bracket, and several positioning protrusions are integrally provided on the valve core positioning bracket opposite to the valve cover cast steel part, each positioning protrusion being inserted into the aligned bracket positioning groove. Several fasteners are provided between the cast steel valve body and the cast steel valve cover. The cast steel valve body and the cast steel valve cover are connected and fixed by fasteners. Several sealing ring mounting grooves are provided from the outside to the inside of the valve body connecting protrusion aligned with the inner wall of the connecting channel.

[0005] The present invention is further configured such that: a valve stem mounting hole is axially provided in the middle of the right end face of the valve cover cast steel part; a valve stem through hole is provided in the valve body connecting protrusion aligned with the valve stem mounting hole; and the valve stem through hole communicates with the valve core mounting cavity.

[0006] The present invention is further configured such that: the outer port of the valve stem mounting hole is provided with a packing groove, and the valve stem mounting hole is provided with a leakage channel at the inner end of the packing groove.

[0007] The present invention is further configured such that: the number of fasteners is 2-8, and all fasteners are stainless steel bolts; the right end of the valve body cast steel part is connected and fixed to the valve cover cast steel part by stainless steel bolts; and an actuator mounting seat is integrally provided on the right end face of the valve cover cast steel part.

[0008] The present invention is further configured such that: a steam inlet channel is provided at the bottom of the valve body cast steel part, and a steam permeable hole is provided on the end face of the valve core positioning bracket near the steam inlet channel, so that the steam inlet channel and the valve core mounting cavity are connected through the steam permeable hole.

[0009] The present invention is further configured such that: a steam outlet hole is provided at the left end of the cast steel valve body, and the inner end of the steam outlet hole is connected to the valve core mounting cavity; and several support frame connecting seats are integrally provided at the bottom of the cast steel valve body.

[0010] The beneficial effects of this utility model are as follows: Compared with the prior art, this utility model has a reasonable structural design. The valve body connecting protrusion is aligned with the inner wall of the connecting channel and 1-3 sealing ring mounting grooves are set from the outside to the inside. The existing sealing rings are set in the sealing ring mounting grooves. The valve body connecting protrusion forms a seal with the inner wall of the connecting channel through the existing sealing rings. The right end of the valve body cast steel part is connected and fixed to the valve cover cast steel part by stainless steel bolts. The connection between the valve body cast steel part and the valve cover cast steel part is reliable, the sealing performance is good, and leakage is not easy. The valve core positioning bracket can play a positioning role for the existing valve core, so that the valve core works stably, and the valve has a long service life and good practicality.

[0011] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model; Figure 2 This is a cross-sectional schematic diagram of the cast steel valve body according to an embodiment of the present utility model; Figure 3 This is a cross-sectional schematic diagram of the cast steel valve cover according to an embodiment of the present utility model; Figure 4 for Figure 1 Enlarged schematic diagram of part I in the middle. Detailed Implementation

[0013] 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.

[0014] See Figures 1 to 4 This utility model discloses a cast steel part for the intermediate pressure main steam valve of a 150MW three-pressure condensing combined steam turbine, including a cast steel part for the valve body 1 and a cast steel part for the valve cover 2. The cast steel part for the valve body 1 is provided with a valve cavity 11. One end of the cast steel part for the valve body 1 is provided with a connecting channel 12. The inner wall surface of the valve cavity 11 is provided with a positioning protrusion 13 aligned with the connecting channel 12. The end face of the positioning protrusion 13 aligned with the connecting channel 12 is provided with a valve seat mounting groove 14 and a bracket positioning groove 15. A valve body connecting protrusion 21 is integrally provided on the inner end face of the valve cover cast steel part 2. A valve core positioning bracket 22 is integrally provided on the inner end face of the valve body connecting protrusion 21. A valve core mounting cavity 221 is provided inside the valve core positioning bracket 22. Several positioning protrusions 23 are integrally provided on the valve core positioning bracket 22 away from the end of the valve cover cast steel part. Each positioning protrusion 23 is inserted into the aligned bracket positioning groove 15. A number of fasteners 3 are provided between the valve body cast steel part 1 and the valve cover cast steel part 2. The valve body cast steel part 1 and the valve cover cast steel part 2 are connected and fixed by the fasteners 3. The valve body connecting protrusion 21 is aligned with the inner wall surface of the connecting channel 12 and has a number of sealing ring mounting grooves 211 from the outside to the inside.

[0015] Preferably, the valve cover cast steel part 2 has a valve stem mounting hole 24 axially provided in the middle of the right end face, and the valve body connecting protrusion 21 has a valve stem through hole 212 aligned with the valve stem mounting hole 24, and the valve stem through hole 212 communicates with the valve core mounting cavity 221.

[0016] To ensure a reasonable structural design, in this embodiment, the outer port of the valve stem mounting hole 24 is provided with a packing groove 25, and the valve stem mounting hole 24 is provided with a leakage channel 26 at the inner end of the packing groove 25.

[0017] The number of fasteners 3 is 2-8, and all fasteners 3 are stainless steel bolts. The right end of the valve body cast steel part 1 is connected and fixed to the valve cover cast steel part 2 by stainless steel bolts. An actuator mounting seat 27 is integrally provided on the right end face of the valve cover cast steel part 2.

[0018] The bottom of the valve body cast steel part 1 is provided with a steam inlet channel 16, and the valve core positioning bracket 22 is provided with a steam passage hole 222 on the end face near the steam inlet channel, so that the steam inlet channel 16 and the valve core mounting cavity 221 are connected through the steam passage hole 222.

[0019] The left end of the cast steel valve body 1 is provided with a steam outlet hole 17, and the inner end of the steam outlet hole 17 is connected to the valve core mounting cavity 221; the bottom of the cast steel valve body 1 is integrally provided with several support frame connecting seats 18.

[0020] In practical applications, the valve body connecting protrusion 21 is aligned with the inner wall of the connecting channel 12, and 1-3 sealing ring mounting grooves 211 are provided from the outside to the inside. Existing sealing rings are installed within the sealing ring mounting grooves 211. The valve body connecting protrusion 21 forms a seal with the inner wall of the connecting channel 12 through the existing sealing rings. The right end of the valve body cast steel part 1 is connected and fixed to the valve cover cast steel part 2 by stainless steel bolts. The valve body cast steel part 1 and the valve cover cast steel part 2... The connection between them is reliable, the sealing performance is good, and it is not easy to leak; the valve core positioning bracket 22 can position the existing valve core, so that the valve core works stably, the structural design is reasonable, and the valve has a long service life and good practicality.

[0021] 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 based on the above description of the utility model shall fall within the scope of protection of this utility model.

Claims

1. A 150MW three-pressure condensing gas turbine intermediate pressure main steam valve cast steel piece, comprising a valve body cast steel piece (1) and a valve cover cast steel piece (2), a valve cavity (11) is arranged in the valve body cast steel piece (1), characterized in that: One end of the valve body cast steel part (1) is provided with a connecting channel (12), and the inner wall of the valve cavity (11) is provided with a positioning protrusion (13) aligned with the connecting channel (12). The end face of the positioning protrusion (13) aligned with the connecting channel (12) is provided with a valve seat mounting groove (14) and a bracket positioning groove (15). A valve body connecting protrusion (21) is integrally provided on the inner end face of the valve cover cast steel part (2). A valve core positioning bracket (22) is integrally provided on the inner end face of the valve body connecting protrusion (21). A valve core mounting cavity (221) is provided inside the valve core positioning bracket (22). Several positioning protrusions (23) are integrally provided on the valve core positioning bracket (22) away from the end of the valve cover cast steel part. Each positioning protrusion (23) is inserted into the aligned bracket positioning groove (15). Several fasteners (3) are provided between the valve body cast steel part (1) and the valve cover cast steel part (2). The valve body cast steel part (1) and the valve cover cast steel part (2) are connected and fixed by the fasteners (3). The valve body connecting protrusion (21) is aligned with the inner wall of the connecting channel (12) and several sealing ring mounting grooves (211) are provided from the outside to the inside.

2. The 150MW three-pressure condensing gas turbine intermediate pressure main steam valve cast steel piece according to claim 1, characterized in that: The valve cover cast steel part (2) has a valve stem mounting hole (24) axially provided in the middle of the right end face. The valve body connecting protrusion (21) is provided with a valve stem through hole (212) aligned with the valve stem mounting hole (24). The valve stem through hole (212) is connected to the valve core mounting cavity (221).

3. The 150MW three-pressure condensing gas turbine intermediate pressure main steam valve cast steel piece according to claim 2, characterized in that: The outer port of the valve stem mounting hole (24) is provided with a packing mounting groove (25), and the valve stem mounting hole (24) is provided with a leakage channel (26) at the inner end of the packing mounting groove (25).

4. The 150MW three-pressure condensing gas turbine intermediate pressure main steam valve cast steel piece according to claim 3, characterized in that: The number of fasteners (3) is 2-8, and all fasteners (3) are stainless steel bolts. The right end of the valve body cast steel part (1) is connected and fixed to the valve cover cast steel part (2) by stainless steel bolts. An actuator mounting seat (27) is integrally provided on the right end face of the valve cover cast steel part (2).

5. The IP valve casting of a 150MW triple pressure condensing gas turbine according to claim 4, characterized in that: The bottom of the valve body cast steel part (1) is provided with a steam inlet channel (16), and the valve core positioning bracket (22) is provided with a steam passage hole (222) on the end face near the steam inlet channel, so that the steam inlet channel (16) and the valve core mounting cavity (221) are connected through the steam passage hole (222).

6. A cast steel part for the intermediate-pressure main steam valve of a 150MW three-pressure condensing combined steam turbine according to claim 5, characterized in that: The left end of the valve body cast steel part (1) is provided with a steam outlet hole (17), and the inner end of the steam outlet hole (17) is connected to the valve core mounting cavity (221); the bottom of the valve body cast steel part (1) is integrally provided with several support frame connecting seats (18).

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