Steam turbine main steam valve assembly

Abstract

The present invention provides a main steam valve assembly for a steam turbine, including a valve body, a valve stem lifter and a valve stem lifting power device are installed on the top of the valve body, the valve stem lifter cooperates with the valve stem lifting power device, the valve body includes a vertical pipe, the inner cavity of the vertical pipe is provided with a valve flap, the valve flap includes a plug body, the plug body matches the inner cavity of the vertical pipe, and the top of the plug body is connected to the valve stem lifter, the inner cavity of the vertical pipe is provided with a closed ring, the outer edge of the closed ring is fixedly connected to the inner cavity wall of the vertical pipe, and the closed ring is arranged parallel to the plug body, the closed ring is located below the plug body, an outlet is opened on the wall of the vertical pipe, the outlet connects the inner cavity of the vertical pipe with the outside, and the outlet is located above the closed ring. The main steam valve assembly for a steam turbine proposed in this technical solution can achieve on-off coordination, the groove on the bottom surface of the plug column on the valve body cooperates with the closed ring, and a good sealing effect can be achieved. When the pressure entering the bottom of the vertical pipe is relatively large, the closed ring deforms and fits more closely with the groove wall.

Description

Technical Field

[0001] The invention relates to the technical field of main steam valves, and in particular to a main steam valve assembly of a steam turbine. Background Art

[0002] The main steam valve is a valve that allows the main steam to enter the steam turbine and can be closed quickly. It is used as a protective mechanism when the steam turbine is in critical operation. The main steam valve uses a lifter to control the valve stem to change the opening and closing of the main steam valve. The lifter provides vertical power through the cam during operation. Summary of the invention

[0003] The invention aims at solving the deficiencies of the prior art and provides a main steam valve assembly for a steam turbine.

[0004] The present invention solves the above technical problems through the following technical means:

[0005] A steam turbine main steam valve assembly, comprising a valve body, a valve stem lifter and a valve stem lifting power device are installed on the top of the valve body, the valve stem lifter cooperates with the valve stem lifting power device, the valve body comprises a vertical pipe, the inner cavity of the vertical pipe is provided with a valve flap, the valve flap comprises a plug body, the plug body matches the inner cavity of the vertical pipe, and the top of the plug body is connected to the valve stem lifter, the inner cavity of the vertical pipe is provided with a closed ring, the outer edges of the closed ring are fixedly connected to the inner cavity wall of the vertical pipe, and the closed ring is arranged parallel to the plug body, the closed ring is located below the plug body, an outlet is opened on the pipe wall of the vertical pipe, the outlet connects the inner cavity of the vertical pipe with the outside, and the outlet is located above the closed ring;

[0006] A plug is fixedly connected to the bottom of the plug body, the plug is coaxially arranged with the closed ring, and the bottom radius of the plug is larger than the inner diameter of the closed ring, the closed ring is in the shape of a hollow table, and a groove matching the closed ring is provided on the bottom surface of the plug, the groove wall of the groove is in the shape of a trumpet, and the bottom radius of the groove is larger than the radius of the closed ring, and the top radius of the groove is smaller than the radius of the closed ring, the top of the closed ring can be inserted into the groove, and the depth of the groove is not less than the thickness of the closed ring.

[0007] As an improvement on the above technical solution, the valve stem lifter includes a cylinder, both ends of the cylinder are not closed, a force-bearing plate is coaxially arranged in the inner cavity of the cylinder, the bottom of the force-bearing plate is fixedly connected to a connecting rod, the bottom end of the connecting rod is fixedly connected to the top of the plug body, a strip through groove is opened on the side wall of the cylinder, the strip through groove is vertically arranged, a round rod passes through the strip through groove, one end of the round rod is fixedly connected to the force-bearing plate, a lifting rod is arranged on the outside of the cylinder, the lifting rod is vertically arranged with the round rod, and the lifting rod passes under the round rod, one end of the lifting rod is connected to the outer wall of the cylinder through a pin shaft, a top plate is arranged above the cylinder, the top plate is arranged parallel to the force-bearing plate, and the bottom edge of the top plate is fixedly connected to a fixing rod, and one end of the fixing rod away from the top plate is fixedly connected to the top end of the cylinder wall of the cylinder, and a compression spring is placed between the top plate and the force-bearing plate.

[0008] As an improvement of the above technical solution, an adjustment plate is also placed between the top plate and the force-bearing plate, and the compression spring is located between the adjustment plate and the force-bearing plate. A through hole is opened on the top plate, and a thread is engraved on the hole wall of the through hole. An external threaded tube matching the through hole passes through the through hole, and the bottom of the external threaded tube contacts the top of the adjustment plate. A center hole is opened in the middle of the adjustment plate. The center hole is a through hole, and a center rod passes through the center hole. The bottom end of the center rod passes through the compression spring and is fixedly connected to the top of the force-bearing plate. The center hole, center rod, through hole and external threaded tube are coaxially arranged, and the top end of the center rod can be inserted into the external threaded tube. The fixing rod is a vertically arranged straight rod. A positioning hole is opened on the adjustment plate, and the fixing rod passes through the positioning hole.

[0009] As an improvement of the above technical solution, the valve stem lifting power device includes a transmission shaft, which is broken in the middle and a cam is installed at the broken part of the transmission shaft. Clamping plates are coaxially arranged on both sides of the cam, and at least one of the clamping plates on both sides of the cam is detachably connected to the transmission shaft. The transmission shaft is rotatably installed on the frame through a bearing, and the transmission shaft is connected to a power source that drives the transmission shaft to rotate.

[0010] As an improvement of the above technical solution, a bobbin is coaxially arranged on the side of the clamping piece away from the cam, the bobbin is sleeved on the transmission shaft, and the end of the bobbin close to the cam is fixedly connected to the clamping piece, and an internal threaded tube is coaxially arranged on the end of the bobbin away from the clamping piece, and a thread matching the internal threaded tube is engraved on the outer wall of the transmission shaft close to the disconnection point, and a plurality of grooves are provided on the outer wall of the transmission shaft close to the disconnection point, the grooves are arranged along the length direction of the transmission shaft, and sliders matching the grooves are placed in the grooves, one end of the slider is fixedly connected to the inner wall of the bobbin, a through hole is provided at the rotating axis of the cam, and a shaft rod is fixedly connected to the side of the clamping piece close to the cam, the shaft rod is coaxially arranged with the clamping piece, and the length of the shaft rod is greater than the length of the positioning pin rod, and the length of the shaft rod is not greater than 1 / 2 of the thickness of the cam.

[0011] As an improvement of the above technical solution, a plurality of positioning holes are provided on both sides of the cam, and a positioning pin rod cooperating with the positioning hole is fixedly connected to the side of the clamping piece close to the cam, and the positioning pin rod can be inserted into the positioning hole.

[0012] Beneficial effects of the present invention: The main steam valve assembly of the steam turbine proposed in the technical solution can achieve on-off coordination, and the groove on the bottom surface of the plug on the valve body cooperates with the closing ring to achieve a good sealing effect. When the pressure entering the bottom of the vertical pipe is relatively high, the closing ring deforms and fits more closely with the groove wall.

[0013] The valve stem lifting power device connects the cam to the transmission shaft in a detachable manner, so that when the cam is replaced, the cam can be replaced alone without replacing other components together. This facilitates the replacement process on the one hand, and reduces waste on the other.

[0014] The valve stem lifter uses spring force as the applied force; during use, the adjustment plate and the force plate can also be adjusted to change the size of the elastic force, thereby achieving the effect of controlling the size of the applied force. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the valve body structure of the present invention;

[0017] Figure 3 It is a schematic diagram of the structure of the valve stem lifter of the present invention;

[0018] Figure 4 This is a schematic diagram of the structure of the valve stem lifting power device of the present invention;

[0019] Figure 5 T Figure 4 Enlarged view of point A. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0022] Example

[0023] like Figure 1-5 As shown, the main steam valve assembly of the steam turbine described in this embodiment includes a valve body 1, a valve stem lifter 2 and a valve stem lifting power device 3 are installed on the top of the valve body 1, the valve stem lifter 2 cooperates with the valve stem lifting power device 3, the valve body 1 includes a vertical pipe 11, the inner cavity of the vertical pipe 11 is provided with a valve flap, the valve flap includes a plug body 12, the plug body 12 matches the inner cavity of the vertical pipe 11, and the top of the plug body 12 is connected to the valve stem lifter 2, the inner cavity of the vertical pipe 11 is provided with a closed ring 13, the outer edges of the closed ring 13 are fixedly connected to the inner cavity wall of the vertical pipe 11, and the closed ring 13 is arranged parallel to the plug body 12, the closed ring 13 is located below the plug body 12, and an outlet 14 is opened on the pipe wall of the vertical pipe 11, the outlet 14 connects the inner cavity of the vertical pipe 11 with the outside, and the outlet 14 is located above the closed ring 13;

[0024] A plug post 15 is fixedly connected to the bottom of the plug body 12. The plug post 15 is coaxially arranged with the closed ring 13, and the bottom radius of the plug post 15 is larger than the inner diameter of the closed ring 13. The closed ring 13 is in the shape of a hollow table. The bottom surface of the plug post 15 is provided with a groove 16 that cooperates with the closed ring 13. The groove wall of the groove 16 is in the shape of a trumpet, and the bottom radius of the groove 16 is larger than the radius of the closed ring 13, and the top radius of the groove 16 is smaller than the radius of the closed ring 13. The top of the closed ring 13 can be inserted into the groove 16, and the depth of the groove 16 is not less than the thickness of the closed ring 13.

[0025] The main steam valve assembly of the steam turbine proposed in the technical solution can achieve on-off coordination. The groove 16 on the bottom surface of the plug on the valve body 1 cooperates with the closing ring 13 to achieve a good sealing effect. When the pressure entering the bottom of the vertical pipe is relatively high, the closing ring 13 deforms and fits more closely with the groove wall of the groove 16.

[0026] See also Figure 2The valve stem lifter 2 includes a cylinder 21, both ends of which are not closed, a force plate 22 is coaxially arranged in the inner cavity of the cylinder 21, a connecting rod 23 is fixedly connected to the bottom of the force plate 22, and the bottom end of the connecting rod 23 is fixedly connected to the top of the plug body 12, and a strip through groove 24 is opened on the side wall of the cylinder 21, and the strip through groove 24 is arranged in a vertical manner, and a round rod 25 passes through the strip through groove 24, and one end of the round rod 25 is fixedly connected to the force plate 22, and the outer wall of the cylinder 21 is provided with a strip through groove 24, and the strip through groove 24 is provided with a round rod 25, and one end of the round rod 25 is fixedly connected to the force plate 22. A lifting rod 26 is provided, and the lifting rod 26 is vertically arranged with the round rod 25, and the lifting rod 26 passes under the round rod 25, one end of the lifting rod 26 is connected to the outer wall of the cylinder 21 through a pin shaft, and a top plate 27 is provided above the cylinder 21, and the top plate 27 is arranged parallel to the force plate 22, and a fixing rod 28 is fixedly connected to the bottom edge of the top plate 27, and one end of the fixing rod 28 away from the top plate 27 is fixedly connected to the top end of the cylinder wall of the cylinder 21, and a compression spring 29 is placed between the top plate 27 and the force plate 22. An adjusting plate 210 is also placed between the top plate 27 and the force-bearing plate 22, and a compression spring 29 is located between the adjusting plate 210 and the force-bearing plate 22. A through hole 211 is provided on the top plate 27, and a thread is engraved on the hole wall of the through hole 211. An external threaded tube 212 matching the through hole 211 passes through the through hole 211, and the bottom of the external threaded tube 212 contacts the top of the adjusting plate 210. A center hole 213 is provided in the middle of the adjusting plate 210, and the center hole 213 is provided in the middle of the adjusting plate 210. 13 is a through hole, and a center rod 214 passes through the center hole 213, and the bottom end of the center rod 214 passes through the compression spring 29 to be fixedly connected to the top of the force-bearing plate 22. The center hole 213, the center rod 214, the through hole 211 and the external threaded tube 212 are coaxially arranged, and the top end of the center rod 214 can be inserted into the external threaded tube 212. The fixing rod 28 is a vertically arranged straight rod. A positioning hole 215 is opened on the adjustment plate 210, and the fixing rod 28 passes through the positioning hole 215.

[0027] The valve stem lifter uses the spring force as the applied force; during use, the adjustment plate 210 and the force plate 22 can also be adjusted to change the magnitude of the elastic force, thereby achieving the effect of controlling the magnitude of the applied force, thereby effectively reducing the bending or breakage of the valve stem and the rupture of the valve body. When in use, the distance between the adjustment plate 210 and the force plate 22 can be changed by rotating the external threaded tube 212, thereby changing the compression length of the compression spring 29, and thus indirectly changing the elastic force, that is, the applied force.

[0028] See also Figure 4 and 5The valve stem lifting power device 3 includes a transmission shaft 31, the transmission shaft 31 is broken in the middle, and a cam 32 is installed at the broken part of the transmission shaft 31, and clamping pieces 33 are coaxially arranged on both sides of the cam 32, and at least one of the clamping pieces 33 on both sides of the cam 32 is detachably connected to the transmission shaft 31, and the transmission shaft 31 is rotatably installed on the frame through a bearing, and the transmission shaft 31 is connected to a power source 34 for driving the transmission shaft 31 to rotate. When in use, the cam 32 pushes the free end of the lifting rod 26.

[0029] A tube 35 is coaxially arranged on the side of the clamping piece 33 away from the cam 32. The tube 35 is sleeved on the transmission shaft 31, and one end of the tube 35 close to the cam 32 is fixedly connected to the clamping piece 33. An internal thread tube 36 is coaxially arranged on the end of the tube 35 away from the clamping piece 33. A thread matching the internal thread tube 36 is engraved on the outer wall of the transmission shaft 31 near the disconnection point, and a plurality of grooves 37 are opened on the outer wall of the transmission shaft 31 near the disconnection point. The grooves 37 are arranged along the transmission shaft. 31 is arranged in the length direction, and a slider 38 cooperating with the groove 37 is placed in the groove 37, one end of the slider 38 is fixedly connected to the inner wall of the barrel 35, a through hole 311 is provided at the rotation axis of the cam 32, and a shaft 312 is fixedly connected to the side of the clamping piece 33 close to the cam 32, the shaft 312 is coaxially arranged with the clamping piece 33, and the length of the shaft 312 is greater than the length of the positioning pin 310, and the length of the shaft 312 is not greater than 1 / 2 of the thickness of the cam 32. A plurality of positioning holes 39 are provided on both sides of the cam 32, and a positioning pin 310 cooperating with the positioning hole 39 is fixedly connected to the side of the clamping piece 33 close to the cam 32, and the positioning pin 310 can be inserted into the positioning hole 39, and the cooperation between the positioning hole 39 and the positioning pin 310 is conducive to quick installation, and can prevent the cam 32 and the transmission shaft 31 from rotating relative to each other during use.

[0030] The valve stem lifting power device connects the cam 32 to the transmission shaft 31 in a detachable manner, so that when the cam 32 is replaced, the cam 32 can be replaced alone without replacing other components together, which facilitates the replacement process on the one hand and reduces waste on the other.

[0031] Through the cooperation between the internal threaded barrel 36 and the thread on the transmission shaft 31, the cam 32 can be replaced by rotating the internal threaded barrel 36 to loosen the clamping piece 33. The groove 37 cooperates with the slider 38 to make the internal threaded barrel 36 relatively still when the transmission shaft 31 rotates, thereby preventing the clamping piece 33 from loosening during use. After the cam 32 is replaced, the internal threaded barrel 36 is rotated to push the clamping piece 33 to squeeze the cam 32, so that the cam 32 is fixed.

[0032] It should be noted that, in this article, if there are first and second, etc., relational terms are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steam turbine main steam valve assembly, comprising a valve body (1), a valve stem lifter (2) and a valve stem lifter power device (3) being mounted on the top of the valve body (1), the valve stem lifter (2) cooperating with the valve stem lifter power device (3), characterized in that: The valve body (1) comprises a vertical tube (11), the inner cavity of the vertical tube (11) is provided with a valve flap, the valve flap comprises a plug body (12), the plug body (12) matches the inner cavity of the vertical tube (11), and the top of the plug body (12) is connected to the valve stem lifter (2), the inner cavity of the vertical tube (11) is provided with a closed ring (13), the outer edge of the closed ring (13) is fixedly connected to the inner cavity wall of the vertical tube (11), and the closed ring (13) and the plug body (12) are arranged in parallel, the closed ring (13) is located below the plug body (12), and an outlet (14) is opened on the tube wall of the vertical tube (11), the outlet (14) connects the inner cavity of the vertical tube (11) with the outside, and the outlet (14) is located above the closed ring (13); The bottom of the plug body (12) is fixedly connected with a plug rod (15), the plug rod (15) is coaxially arranged with the closed ring (13), and the bottom radius of the plug rod (15) is larger than the inner diameter of the closed ring (13), the closed ring (13) is in the shape of a hollow platform, the bottom surface of the plug rod (15) is provided with a groove (16) matching with the closed ring (13), the groove wall of the groove (16) is in the shape of a trumpet, the bottom radius of the groove (16) is larger than the radius of the closed ring (13), and the top radius of the groove (16) is smaller than the radius of the closed ring (13), the top of the closed ring (13) can be inserted into the groove (16), and the depth of the groove (16) is not less than the thickness of the closed ring (13); The valve stem lifter (2) comprises a cylinder (21), both ends of which are not closed, a force-bearing plate (22) is coaxially arranged in the inner cavity of the cylinder (21), the bottom of the force-bearing plate (22) is fixedly connected to a connecting rod (23), the bottom end of the connecting rod (23) is fixedly connected to the top of the plug body (12), a strip-shaped through groove (24) is opened on the side wall of the cylinder (21), the strip-shaped through groove (24) is arranged in a vertical manner, a round rod (25) passes through the strip-shaped through groove (24), one end of the round rod (25) is fixedly connected to the force-bearing plate (22), and the outside of the cylinder (21) is arranged A lifting rod (26) is provided, the lifting rod (26) is arranged vertically with the round rod (25), and the lifting rod (26) passes under the round rod (25), one end of the lifting rod (26) is connected to the outer wall of the cylinder (21) through a pin shaft, a top plate (27) is provided above the cylinder (21), the top plate (27) is arranged parallel to the force-bearing plate (22), and a fixing rod (28) is fixedly connected to the bottom edge of the top plate (27), one end of the fixing rod (28) away from the top plate (27) is fixedly connected to the top end of the cylinder wall of the cylinder (21), and a compression spring (29) is placed between the top plate (27) and the force-bearing plate (22); The valve stem lifting power device (3) comprises a transmission shaft (31), the transmission shaft (31) is disconnected in the middle, and a cam (32) is installed at the disconnected portion of the transmission shaft (31), clamping plates (33) are coaxially arranged on both sides of the cam (32), and at least one of the clamping plates (33) on both sides of the cam (32) is detachably connected to the transmission shaft (31), the transmission shaft (31) is rotatably installed on a frame via a bearing, and the transmission shaft (31) is connected to a power source (34) for driving the transmission shaft (31) to rotate.

2. The main steam valve assembly of a steam turbine according to claim 1, characterized in that: An adjusting plate (210) is further placed between the top plate (27) and the force-bearing plate (22), and a compression spring (29) is located between the adjusting plate (210) and the force-bearing plate (22). A through hole (211) is provided on the top plate (27), and a thread is engraved on the hole wall of the through hole (211). An externally threaded tube (212) matching the through hole (211) passes through the through hole (211), and the bottom of the externally threaded tube (212) contacts the top of the adjusting plate (210). A central hole (213) is provided in the middle of the adjusting plate (210), and the central hole (213) is provided at the bottom of the adjusting plate (210). 3) is a through hole, and a center rod (214) passes through the center hole (213), the bottom end of the center rod (214) passes through the compression spring (29) and is fixedly connected to the top of the force-bearing plate (22), the center hole (213), the center rod (214), the through hole (211) and the external threaded tube (212) are coaxially arranged, and the top end of the center rod (214) can be inserted into the external threaded tube (212), the fixing rod (28) is a vertically arranged straight rod, and a positioning hole (215) is opened on the adjustment plate (210), and the fixing rod (28) passes through the positioning hole (215).

3. The main steam valve assembly of a steam turbine according to claim 1, characterized in that: A tube (35) is coaxially arranged on a side of the clamping piece (33) away from the cam (32), the tube (35) being sleeved on the transmission shaft (31), and an end of the tube (35) close to the cam (32) is fixedly connected to the clamping piece (33), an internal thread tube (36) is coaxially arranged on an end of the tube (35) away from the clamping piece (33), a thread matching the internal thread tube (36) is engraved on an outer wall of the transmission shaft (31) close to the disconnection point, and a plurality of grooves (37) are provided on the outer wall of the transmission shaft (31) close to the disconnection point, the grooves (37) extending along the transmission shaft ( The second groove (31) is arranged in the longitudinal direction, and a slider (38) matched with the second groove (37) is placed in the second groove (37), one end of the slider (38) is fixedly connected to the inner wall of the barrel (35), a through hole (311) is opened at the rotation axis of the cam (32), and a shaft (312) is fixedly connected to the side of the clamping piece (33) close to the cam (32), the shaft (312) and the clamping piece (33) are coaxially arranged, and the length of the shaft (312) is greater than the length of the positioning pin (310), and the length of the shaft (312) is not greater than 1 / 2 of the thickness of the cam (32).

4. The main steam valve assembly of a steam turbine according to claim 3 is characterized in that: A plurality of second positioning holes (39) are provided on both sides of the cam (32); a positioning pin (310) that cooperates with the second positioning hole (39) is fixedly connected to one side of the clamping piece (33) close to the cam (32); the positioning pin (310) can be inserted into the second positioning hole (39).

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