Main steam valve of steam turbine generator unit
By using an electric linear actuator to drive the valve core to move in the main steam valve valve of the steam turbine generator set, the valve core is quickly cut off the steam source and effectively filter and store impurities through the impurity filter device, solving the problems of weakening elasticity of the existing main steam valve and unreasonable filter structure, and improving the safety and stability of the equipment.
Patent Information
- Application Number
- CN202420844559.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-22
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2034-04-22
AI Technical Summary
In long-term use, the existing main steam valve has weakened elasticity and causes hysteresis, making it impossible to quickly and reliably cut off the steam source, which poses safety hazards, and the filter structure is unreasonable and easy to be blocked.
A main steam valve valve of the steam turbine generator set is designed, and the push rod is driven to drive the valve core to move, so as to quickly cut off the steam source, and an impurity filter device is installed in the filter chamber, including a coarse impurity filter and a fine filter, which effectively filters impurities and stores them.
It realizes the rapid and reliable steam cutoff of the main steam valve, ensures safe shutdown, and through a reasonable impurity filtering structure, avoids the inlet blockage, and improves the stability and practicality of the equipment.
Smart Images
Figure CN222687340U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of steam turbines, in particular to a main steam valve of a steam turbine generator set. Background Art
[0002] The air intake and exhaust of the steam turbine are mainly realized through the coordinated actions of various valves. Among them, the high-pressure main steam valve is a valve that allows the main steam to enter the steam turbine and can be quickly closed. When an accident occurs, the main steam valve can immediately and reliably cut off the air intake of the steam turbine to achieve safe shutdown. Therefore, the main steam valve is an important protection device for the safe operation of the steam turbine air supply system. The existing main steam valve opening process: the oil inlet valve is opened, the power oil enters the cylinder to establish oil pressure, pushes the piston up, the valve core moves up synchronously, the valve core moves away from the valve, the main steam valve is opened, and the main steam valve is maintained in the open state by oil pressure. At this time, the spring is in a compressed state; the main steam valve closing process: the oil drain valve is opened, the oil inlet valve is closed, the oil drain is opened, the oil pressure drops, the spring stretches and pushes the piston down, the valve core moves down to the valve, and the main steam valve is closed.
[0003] The spring is the main device to achieve rapid closing of the main steam valve. During the use of the main steam valve, the reciprocating opening and closing of the main steam valve is accompanied by the continuous stretching and compression of the spring. The elasticity of the spring is weakened and the length of the spring is shortened due to long-term use. If it cannot be replaced or repaired in time under special circumstances or during production, the main steam valve will be closed late and not tightly, and the steam source cannot be cut off quickly and reliably, which seriously endangers safety.
[0004] In addition, the existing main steam valve structure is not reasonably designed. The filter used to block impurities when the steam is introduced is generally a cylindrical structure with a small aperture. Moreover, the filtered impurities have nowhere to be stored, which easily leads to blockage of the steam inlet and poor practicality. Utility Model Content
[0005] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a main steam valve for a steam turbine generator set which has a reasonable structural design, good impurity filtering effect, is not easy to clog the steam inlet, can quickly cut off the gas source, is safe, reliable and practical.
[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a main steam valve of a steam turbine generator set, comprising a valve body and a valve cover, wherein the lower end of the valve body is provided with a valve cover mounting through hole, the valve body is provided with a filter chamber and a valve chamber in sequence from bottom to top, the lower right end of the valve body is provided with a steam inlet, the steam inlet is communicated with the filter chamber, and an impurity filtering device is provided in the filter chamber;
[0007] A steam through hole is provided between the filter cavity and the valve cavity, a steam outlet is provided at the left end of the valve body, and the steam outlet is communicated with the valve cavity; a valve stem through hole is provided at the upper end of the valve body, a pressure cover is provided at the upper end of the valve stem through hole, a vertical through hole is vertically provided in the middle of the pressure cover, an electric linear actuator is fixedly provided on the upper end surface of the pressure cover, a push rod is provided at the lower end of the electric linear actuator, the lower end of the push rod passes through the vertical through hole and extends into the valve cavity, a valve core is fixedly provided at the lower end of the push rod, an elastic sealing layer is fixedly provided at the lower end of the valve core, a positioning groove is provided at the upper end of the steam through hole, the push rod is driven by the electric linear actuator to drive the valve core to move downward, and the elastic sealing layer of the valve core forms a seal with the inner wall surface of the positioning groove;
[0008] The impurity filtering device includes an impurity storage mesh box, which has a rectangular structure and an impurity inlet is arranged at the upper right end of the impurity storage mesh box; a coarse impurity filter is arranged at the right end of the impurity storage mesh box, and a fine impurity filter is fixedly arranged at the upper end of the coarse impurity filter, the coarse impurity filter is installed at the outlet position of the steam inlet, and the fine impurity filter is installed at the inlet position of the steam through hole.
[0009] The utility model is further configured as follows: the impurity storage mesh box is fixed to the valve cover by bolts, the impurity storage mesh box, the impurity coarse filter screen and the impurity fine filter screen are all made of stainless steel, and the impurity storage mesh box, the impurity coarse filter screen and the impurity fine filter screen are integrally arranged or fixed by screws, at least one positioning net is arranged between the impurity storage mesh box and the impurity fine filter screen, a plurality of first reinforcing ribs are arranged between the impurity storage mesh box and the impurity coarse filter screen, and a plurality of second reinforcing ribs are arranged between the impurity coarse filter screen and the impurity fine filter screen.
[0010] The utility model is further configured as follows: a piston is arranged in the valve stem through hole, the piston is sleeved on a push rod, and the push rod forms a seal between the piston and the inner wall surface of the valve stem through hole.
[0011] The utility model is further configured as follows: a positioning boss is provided on the lower end surface of the gland, a plurality of first annular grooves are provided on the inner wall surface of the vertical through hole, a first O-ring is provided in each first annular groove, the gland is fixed to the upper end surface of the valve body by bolts, and the gland is fixed to the electric linear actuator by bolts.
[0012] The utility model is further configured as follows: a valve cover protrusion is integrally provided on the valve cover, a second annular groove is provided on the valve cover protrusion, a second O-ring is provided in the second annular groove, and the valve cover forms a seal with the inner wall surface of the valve cover mounting through hole through the second O-ring.
[0013] The utility model is further configured as follows: a third annular groove is provided on the lower end face of the valve body at the outer periphery of the lower port of the steam outlet, a third O-ring is provided in the third annular groove, and a seal is formed between the upper end face of the valve cover and the lower end face of the valve body through the third O-ring.
[0014] The utility model is further configured as follows: the electric linear actuator is an electric push rod or a cylinder linear reciprocating mechanism or a hydraulic linear reciprocating mechanism.
[0015] The beneficial effects of the utility model are as follows: compared with the prior art, the utility model has a reasonable structural design, the impurity coarse filter of the impurity filtering device performs the first coarse filtration on the steam fed from the steam inlet, and the filtered impurities can fall from the impurity inlet into the impurity storage net box for storage, so that the steam inlet is not easily blocked and the operation is stable;
[0016] The steam that has been roughly filtered is then filtered through the impurity fine filter for a second time before entering the steam through hole, and the impurity filtering effect is good;
[0017] When an accident occurs, the electric linear actuator drives the push rod to move the valve core downward, and the elastic sealing layer of the valve core forms a seal with the inner wall of the positioning groove; the main steam valve can immediately and reliably cut off the turbine air intake to achieve safe shutdown; the whole process does not require spring components, can quickly cut off the gas source, safely and reliably, and effectively solves the technical problem of "long-term use of springs in traditional main steam valves leads to weakened elasticity and shortened spring length. Under special circumstances or during production, they cannot be replaced or repaired in time, which will cause the main steam valve to close late and loosely, and cannot quickly and reliably cut off the steam source, seriously endangering safety". It has good practicality.
[0018] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;
[0020] Figure 2 This is a schematic diagram of the structure of the valve body of the utility model embodiment;
[0021] Figure 3 This is a schematic diagram of the structure of the electric linear actuator of the utility model embodiment;
[0022] Figure 4 It is a schematic diagram of the assembly of the impurity filtering device and the valve cover according to an embodiment of the utility model. DETAILED DESCRIPTION
[0023] In the description of this embodiment, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "back", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore, cannot be understood as a limitation on the utility model. In addition, if the terms "first", "second", and "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0024] See also Figures 1 to 4 The utility model discloses a main steam valve for a steam turbine generator set, comprising a valve body 1 and a valve cover 2, wherein a valve cover mounting through hole 11 is provided at the lower end of the valve body 1, a filter chamber 12 and a valve chamber 13 are sequentially provided in the valve body 1 from bottom to top, a steam inlet 14 is provided at the lower right end of the valve body 1, the steam inlet 14 is communicated with the filter chamber 12, and an impurity filtering device 3 is provided in the filter chamber 12;
[0025] A steam through hole 15 is provided between the filter chamber 12 and the valve chamber 13, and a steam outlet 16 is provided at the left end of the valve body 1, and the steam outlet 16 is communicated with the valve chamber 13; a valve stem through hole 17 is provided at the upper end of the valve body 1, and a gland 4 is provided at the upper end of the valve stem through hole 17, and a vertical through hole 41 is vertically provided in the middle of the gland 4, and an electric linear actuator 5 is fixedly provided on the upper end surface of the gland 4, and a push rod 51 is provided at the lower end of the electric linear actuator 5, and the lower end of the push rod 51 extends into the valve chamber 13 after passing through the vertical through hole, and a valve core 6 is fixedly provided at the lower end of the push rod 51, and an elastic sealing layer 61 is fixedly provided at the lower end of the valve core 6, and a positioning groove 151 is provided at the upper end of the steam through hole 15, and the push rod 51 is driven by the electric linear actuator 5 to drive the valve core 6 to move downward, and the elastic sealing layer 61 of the valve core 6 and the inner wall surface of the positioning groove 151 form a seal;
[0026] The impurity filtering device 3 includes an impurity storage mesh box 31, which is a rectangular structure. An impurity inlet 311 is provided at the upper right end of the impurity storage mesh box 31; an impurity coarse filter 32 is provided at the right end of the impurity storage mesh box 31, and an impurity fine filter 33 is fixedly provided on the upper end of the impurity coarse filter 32. The impurity coarse filter 32 is installed at the outlet position of the steam inlet 14, and the impurity fine filter 33 is installed at the inlet position of the steam through hole 15.
[0027] Preferably, the positioning groove 151 is a conical structure, the valve core 6 is a conical structure, and the elastic sealing layer 61 is made of rubber, silicone or polytetrafluoroethylene. The lower end of the push rod 51 is integrally provided with the valve core 6 or fixed by bolts, and the elastic sealing layer 61 is fixed to the outer surface of the valve core 6 by glue or threaded connection.
[0028] In order to make the structural design of the utility model more reasonable, as a preferred embodiment, the impurity storage net box 31 described in this embodiment is fixed to the valve cover 2 by bolts, and the impurity storage net box 31, the impurity coarse filter net 32 and the impurity fine filter net 33 are all made of stainless steel, and the impurity storage net box 31, the impurity coarse filter net 32 and the impurity fine filter net 33 are integrally arranged or fixed by screws, at least one positioning net 34 is arranged between the impurity storage net box 31 and the impurity fine filter net 33, a plurality of first reinforcing ribs 35 are arranged between the impurity storage net box 31 and the impurity coarse filter net 32, and a plurality of second reinforcing ribs 36 are arranged between the impurity coarse filter net 32 and the impurity fine filter net 33.
[0029] Preferably, the positioning net 34 is made of stainless steel, the lower end of the positioning net 34 is integrally arranged with the impurity storage net box 31 , and the upper end of the positioning net 34 is integrally arranged with the impurity fine filter 33 .
[0030] A piston 7 is disposed in the valve stem through hole 17, and the piston 7 is sleeved on the push rod 51. The push rod 51 forms a seal between the piston 7 and the inner wall surface of the valve stem through hole 17. Preferably, the piston 7 and the push rod 51 are fixed by clamping or bonding with glue or locking with screws.
[0031] A positioning boss is provided on the lower end surface of the gland 4, a plurality of first annular grooves are provided on the inner wall surface of the vertical through hole 41, a first O-ring 8 is provided in each first annular groove, the gland 4 is fixed to the upper end surface of the valve body 1 by bolts, and the gland 4 is fixed to the electric linear actuator 5 by bolts.
[0032] The valve cover 2 is integrally provided with a valve cover protrusion, the valve cover protrusion is provided with a second annular groove, a second O-ring 9 is provided in the second annular groove, and the valve cover 2 is sealed between the second O-ring 9 and the inner wall surface of the valve cover installation through hole 11.
[0033] The lower end surface of the valve body 1 is provided with a third annular groove at the outer periphery of the lower end of the steam outlet 16, and a third O-type sealing ring 10 is provided in the third annular groove, and the upper end surface of the valve cover 2 and the lower end surface of the valve body 1 are sealed by the third O-type sealing ring 10. Preferably, the valve cover 2 and the lower end surface of the valve body 1 are fixed by bolts.
[0034] The electric linear actuator 5 is an electric push rod or a cylinder linear reciprocating mechanism or a hydraulic linear reciprocating mechanism.
[0035] In actual application, the impurity coarse filter 32 of the impurity filtering device 3 performs the first coarse filtration on the steam fed from the steam inlet 14, and the filtered impurities can fall from the impurity inlet 311 into the impurity storage net box 31 for storage, so that the steam inlet 14 is not easily blocked and the operation is stable;
[0036] The steam after the coarse filtration is then filtered through the impurity fine filter 33 for a second time before entering the steam through hole 15, and the impurity filtering effect is good;
[0037] When an accident occurs, the electric linear actuator 5 drives the push rod 51 to drive the valve core 6 to move downward, and the elastic sealing layer 61 of the valve core 6 forms a seal with the inner wall of the positioning groove 151; the main steam valve can immediately and reliably cut off the turbine air intake to achieve safe shutdown; the whole process does not require spring components, can quickly cut off the gas source, is safe and reliable, and has a reasonable structural design. It effectively solves the technical problem that "the traditional main steam valve uses springs for a long time, resulting in weakened elasticity and shortened spring length. Under special circumstances or during production, it cannot be replaced or repaired in time, which will cause the main steam valve to close lagging and not tight, and cannot quickly and reliably cut off the steam source, seriously endangering safety". It has good practicality.
[0038] The utility model is suitable for photothermal or photovoltaic steam turbine generator sets.
[0039] The specific description of the present invention in the above embodiments is only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Technical engineers in this field may make some non-essential improvements and adjustments to the present invention based on the contents of the above-mentioned utility model, which fall within the scope of protection of the present invention.
Claims
1. A main steam valve for a steam turbine generator set, comprising a valve body (1) and a valve cover (2), characterized in that: A valve cover mounting through hole (11) is provided at the lower end of the valve body (1), a filter chamber (12) and a valve chamber (13) are provided in sequence from bottom to top in the valve body (1), a steam inlet (14) is provided at the lower right end of the valve body (1), the steam inlet (14) is communicated with the filter chamber (12), and an impurity filtering device (3) is provided in the filter chamber (12); A steam through hole (15) is provided between the filter chamber (12) and the valve chamber (13); a steam outlet (16) is provided at the left end of the valve body (1), and the steam outlet (16) is communicated with the valve chamber (13); a valve stem through hole (17) is provided at the upper end of the valve body (1); a pressure cover (4) is provided at the upper end of the valve stem through hole (17); a vertical through hole (41) is vertically provided in the middle of the pressure cover (4); an electric linear actuator (5) is fixedly provided on the upper end surface of the pressure cover (4); and the electric linear actuator (5) is provided at the lower end thereof. A push rod (51) is arranged at the end thereof, the lower end of the push rod (51) passes through the vertical through hole and then extends into the valve cavity (13), a valve core (6) is fixedly arranged at the lower end of the push rod (51), an elastic sealing layer (61) is fixedly arranged at the lower end of the valve core (6), a positioning groove (151) is arranged at the upper end of the steam through hole (15), the push rod (51) is driven by the electric linear actuator (5) to drive the valve core (6) to move downward, and the elastic sealing layer (61) of the valve core (6) and the inner wall surface of the positioning groove (151) form a seal; The impurity filtering device (3) comprises an impurity storage mesh box (31), the impurity storage mesh box (31) is in a rectangular structure, and an impurity inlet (311) is arranged at the upper right end of the impurity storage mesh box (31); a coarse impurity filter (32) is arranged at the right end of the impurity storage mesh box (31), and an impurity fine filter (33) is fixedly arranged at the upper end of the coarse impurity filter (32), the coarse impurity filter is installed at the outlet position of the steam inlet (14), and the impurity fine filter (33) is installed at the inlet position of the steam through hole (15).
2. A main steam valve for a steam turbine generator set according to claim 1, characterized in that: The impurity storage net box (31) is fixed to the valve cover (2) by bolt connection; the impurity storage net box (31), the impurity coarse filter net (32) and the impurity fine filter net (33) are all made of stainless steel, and the impurity storage net box (31), the impurity coarse filter net (32) and the impurity fine filter net (33) are integrally arranged or fixed by screw connection; at least one positioning net (34) is arranged between the impurity storage net box (31) and the impurity fine filter net (33); a plurality of first reinforcing ribs (35) are arranged between the impurity storage net box (31) and the impurity coarse filter net (32); and a plurality of second reinforcing ribs (36) are arranged between the impurity coarse filter net (32) and the impurity fine filter net (33).
3. A main steam valve for a steam turbine generator set according to claim 2, characterized in that: A piston (7) is arranged in the valve stem through hole (17). The piston (7) is sleeved on a push rod (51). The push rod (51) forms a seal between the piston (7) and the inner wall surface of the valve stem through hole (17).
4. A main steam valve for a steam turbine generator set according to claim 3, characterized in that: A positioning boss is provided on the lower end surface of the gland (4), a plurality of first annular grooves are provided on the inner wall surface of the vertical through hole (41), a first O-ring (8) is provided in each first annular groove, the gland (4) is fixed to the upper end surface of the valve body (1) by bolts, and the gland (4) is fixed to the electric linear actuator (5) by bolts.
5. A main steam valve for a steam turbine generator set according to claim 4, characterized in that: The valve cover (2) is integrally provided with a valve cover protrusion, the valve cover protrusion is provided with a second annular groove, a second O-type sealing ring (9) is provided in the second annular groove, and the valve cover (2) forms a seal with the inner wall surface of the valve cover mounting through hole (11) through the second O-type sealing ring (9).
6. A main steam valve for a steam turbine generator set according to claim 5, characterized in that: A third annular groove is provided on the lower end surface of the valve body (1) at the outer periphery of the lower end of the steam outlet (16), and a third O-type sealing ring (10) is provided in the third annular groove. The third O-type sealing ring (10) forms a seal between the upper end surface of the valve cover (2) and the lower end surface of the valve body (1).
7. A main steam valve for a steam turbine generator set according to claim 1, characterized in that: The electric linear actuator (5) is an electric push rod or a cylinder linear reciprocating mechanism or a hydraulic linear reciprocating mechanism.