Hydraulic steam extraction valve

Abstract

The utility model discloses a hydraulic drive steam extraction valve which comprises a valve body, a valve cover, a valve rod, a rocker arm, a valve clack and a hydraulic system, the valve cover is installed on the upper portion of the valve body, the valve rod penetrates through the valve body, the hydraulic system is in linkage connection with one end of the valve rod and used for driving the valve rod to rotate, and the rocker arm is arranged in the valve body and in linkage connection with the valve clack. The valve clack is mounted on the rocker arm; the soft limiting structure is arranged in the valve body and used for limiting the stroke of the valve clack, the soft limiting structure comprises a mounting protrusion and a silica gel buffer block, the mounting protrusion is integrally arranged on the inner wall of the valve body, a mounting groove matched with the mounting protrusion is formed in the silica gel buffer block, and the silica gel buffer block is arranged in the mounting groove. And the silica gel buffer block is coated on the periphery of the mounting bulge. When the valve is opened, the valve clack collides with the inner wall of the valve body in a soft contact mode, the function of protecting the valve can be achieved, and working noise can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a hydraulic steam extraction valve. Background Art

[0002] The hydraulic extraction valve is used in the extraction system of power plants or thermal power plants, or in the pipelines of other systems and non-corrosive media such as water, to prevent the pressure in the steam turbine from suddenly decreasing when the turbine is loaded, and the steam in the extraction pipe and each heater from flowing back into the steam turbine, causing the steam turbine to break and destroy the turbine generator, and to prevent the leakage of the heater system pipeline so that water is tightly closed from the extraction to protect the safe operation of the steam turbine. When the water level in the feedwater heater is too high, the pneumatic device components will quickly separate the steam turbine after receiving the liquid backflow signal, so as to provide good protection for the steam turbine or the extraction system.

[0003] The utility model patent with patent publication number CN203240023U discloses a new type of steam extraction check valve. When the valve disc is fully opened, the valve disc will have a rigid impact with the inner wall of the valve body, which is easy to damage the valve and affect the service life of the valve. Utility Model Content

[0004] The utility model aims to provide a hydraulic steam extraction valve. When the utility model is opened, the valve disc hits the inner wall of the valve body in a soft contact manner, which can not only protect the valve but also reduce working noise.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a hydraulic steam extraction valve, comprising a valve body, a valve cover, a valve stem, a rocker arm, a valve disc and a hydraulic system, wherein the valve cover is installed on the upper part of the valve body, the valve stem passes through the valve body, the hydraulic system is linked to one end of the valve stem for driving the valve stem to rotate, the rocker arm is arranged inside the valve body and linked to the valve disc, and the valve disc is installed on the rocker arm; it also includes a soft limit structure arranged inside the valve body to limit the stroke of the valve disc, the soft limit structure includes a mounting protrusion and a silicone buffer block, the mounting protrusion is integrally arranged on the inner wall of the valve body, and the silicone buffer block is provided with a mounting groove matching the mounting protrusion, so that the silicone buffer block is covered on the outer periphery of the mounting protrusion.

[0006] By adopting the above technical solution, a soft limit structure is set at a specific position inside the valve body, which is composed of a mounting protrusion with relatively large internal rigidity and a silicone buffer block with certain elasticity arranged on the outer periphery of the mounting protrusion. When the valve disc is opened and rotates, the valve disc hits the soft limit structure. Since the valve disc is in contact with the silicone buffer block, no rigid collision will occur between the two. This can not only protect the valve and improve the service life of the valve, but also reduce working noise.

[0007] The utility model is further configured that the side of the silicone buffer block that contacts the valve disc is in a curved surface shape.

[0008] By adopting the above technical solution, it is possible to achieve tangential cooperation with the valve disc within a certain angle range, thereby achieving a better buffering effect.

[0009] The utility model is further configured as follows: the soft limit structure also includes a connecting screw and a connecting nut, a nut groove whose shape is adapted to the outer shape of the connecting nut is provided on the silicone buffer block at a position corresponding to below the mounting groove, the connecting nut is embedded in the nut groove, and the lower end of the nut groove is provided with a limit flange extending inwardly for limiting the connecting nut, the upper end of the nut groove is provided with a lower hole connected to the mounting groove, an upper hole is provided at a position corresponding to above the mounting groove on the silicone buffer block, a middle hole is provided on the mounting protrusion, the upper hole, the middle hole and the lower hole are coaxially arranged, and the screw portion of the connecting screw passes through the upper hole, the middle hole and the lower hole in sequence and cooperates with the connecting nut thread.

[0010] By adopting the above technical solution, the silicone buffer block is locked on the mounting protrusion by using a connecting nut and a connecting nut in cooperation, which can improve the firmness of the installation of the silicone buffer block. At the same time, no threads are set on the mounting protrusion, which can avoid the situation where the valve is scrapped due to failure of the threads after long-term use due to setting threads on the mounting protrusion.

[0011] The utility model is further configured that a connecting shaft is provided on the valve disc, the connecting shaft passes through the rocker arm, and the rocker arm and the valve disc are locked together by a threaded hexagonal nut.

[0012] By adopting the above technical solution, the connection structure is simple and reliable, and disassembly and assembly are very convenient.

[0013] The utility model is further configured that a slot is provided at the outer end of the connecting shaft, a silicone block is inserted into the slot, the outer end of the silicone block extends out of the slot, and the outer end of the silicone block is in an arc shape.

[0014] By adopting the above technical solution and arranging a silicone block on the connecting shaft, the buffering effect when the valve disc contacts the soft limit structure can be further improved.

[0015] The utility model is further configured such that the connecting shaft, the hexagonal nut and the silicone block are locked together by a latch.

[0016] By adopting the above technical solution, the loosening of the hexagonal nut and the silicone block can be avoided, and the stability of the connection structure of the three can be improved.

[0017] The utility model is further configured as follows: a transmission clutch sleeve is provided on the rocker arm, and the transmission clutch sleeve is linked to the valve stem through a flat key, and a first axial hole and a second axial hole for the valve stem to pass through are coaxially arranged on both sides of the valve body, a sealing groove is provided at the outer end of the first axial hole, a filler is embedded in the sealing groove, and a clamping nut for pressing the filler against the sealing groove is threadedly connected at the outer end of the sealing groove, and a limiting groove is provided at the outer end of the second axial hole, and a limiting convex portion extending outward is provided at the end of the valve stem extending into the second axial hole, a spacer is provided in the limiting groove, and a handle cap for pressing the spacer is threadedly connected to the outer end of the limiting groove so that the spacer presses the limiting convex portion against the inner end of the limiting groove, and a sealing gasket is also provided between the handle cap and the valve body.

[0018] By adopting the above technical solution, the valve body, valve stem and rocker arm can be stably matched, which not only has good sealing performance but also is very convenient for disassembly and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A first sectional view of the utility model as a whole;

[0020] Figure 2 It is a structural schematic diagram of the soft limit structure of the utility model;

[0021] Figure 3 A second sectional view of the utility model as a whole;

[0022] Figure 4 A third sectional view of the utility model as a whole;

[0023] Figure 5 This is a schematic diagram of the connection structure between the rocker arm and the valve disc of the utility model;

[0024] Figure 6 It is a structural schematic diagram of the hydraulic system of the utility model.

[0025] In the figure: 1. valve body; 2. valve cover; 3. valve stem; 4. rocker arm; 5. valve disc; 6. hydraulic system; 7. soft limit structure; 8. mounting protrusion; 9. silicone buffer block; 10. mounting groove; 11. connecting screw; 12. connecting nut; 13. nut groove; 14. limit flange; 15. center hole; 16. connecting shaft; 17. hexagonal nut; 18. slot; 19. silicone block; 20. latch; 21. Transmission clutch sleeve; 22. First shaft hole; 23. Second shaft hole; 24. Sealing groove; 25. Packing; 26. Pressing nut; 27. Limiting groove; 28. Limiting convex part; 29. ​​Spacer; 30. Handle cap; 31. Sealing gasket; 32. Two-position three-way solenoid valve; 33. Hydraulic reversing valve; 34. Hydraulic cylinder; 35. Oil inlet ball valve; 36. Oil return ball valve; 37. Lower hole; 38. Upper hole. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Example: As shown in the attached Figures 1 to 6 The hydraulic steam extraction valve shown includes a valve body 1, a valve cover 2, a valve stem 3, a rocker arm 4, a valve disc 5 and a hydraulic system 6. The valve cover 2 is installed on the upper part of the valve body 1. The valve stem 3 penetrates the valve body 1. The hydraulic system 6 is linked to one end of the valve stem 3 to drive the valve stem 3 to rotate. The hydraulic system 6 is composed of a two-position three-way solenoid valve 32, a hydraulic reversing valve 33, a hydraulic cylinder 34, an oil inlet ball valve 35 and an oil return ball valve 36. The extended end of the hydraulic cylinder 34 of the hydraulic system 6 is connected to the valve stem 3 through a connecting rod. The rocker arm 4 is arranged inside the valve body 1 and is linked to the valve disc 5, and the valve disc 5 is installed on the rocker arm 4; the hydraulic steam extraction valve also includes a soft limit structure 7 arranged inside the valve body 1 to limit the travel of the valve disc 5, and the soft limit structure 7 includes a mounting protrusion 8 and a silicone buffer block 9, and the mounting protrusion 8 is integrally arranged on the inner wall of the valve body 1, and the silicone buffer block 9 is provided with a mounting groove 10 matched with the mounting protrusion 8, so that the silicone buffer block 9 is covered on the outer periphery of the mounting protrusion 8. By arranging the soft limit structure 7 at a specific position inside the valve body 1, that is, it is composed of the mounting protrusion 8 with relatively large internal rigidity and the silicone buffer block 9 with certain elasticity arranged on the outer periphery of the mounting protrusion 8, when the valve disc 5 is opened and rotates, the valve disc 5 hits the soft limit structure 7, and since the valve disc 5 is in contact with the silicone buffer block 9, no rigid impact will be generated between the two, which can not only protect the valve and improve the service life of the valve, but also reduce the working noise.

[0028] As attached Figure 2 As shown, the side of the silicone buffer block 9 that contacts the valve flap 5 is in a curved shape. This design can achieve tangential cooperation with the valve flap 5 within a certain angle range, so that the buffering effect is better.

[0029] As attached Figure 2As shown, the soft limit structure 7 also includes a connecting screw 11 and a connecting nut 12. A nut groove 13 whose shape is adapted to the outer shape of the connecting nut 12 is provided at a position below the corresponding mounting groove 10 on the silicone buffer block 9. The connecting nut 12 is embedded in the nut groove 13, and a limiting flange 14 extending inwardly at the lower end of the nut groove 13 is provided for limiting the connecting nut 12. A lower hole 37 connected to the mounting groove 10 is provided at the upper end of the nut groove 13. An upper hole 38 is provided through the position above the corresponding mounting groove 10 on the silicone buffer block 9. A middle hole 15 is provided through the mounting protrusion 8. The upper hole 38, the middle hole 15 and the lower hole 37 are coaxially arranged. The screw portion of the connecting screw 11 passes through the upper hole 38, the middle hole 15 and the lower hole 37 in sequence and is threadedly matched with the connecting nut 12. The screw head of the connecting screw 11 is tightly pressed against the upper end of the silicone buffer block 9. The silicone buffer block 9 is locked on the mounting protrusion 8 by using the connecting nut 12 and the connecting nut 12 in cooperation with each other, so that the firmness of the installation of the silicone buffer block 9 can be improved. At the same time, no thread is set on the mounting protrusion, so that the valve can be scrapped due to thread failure after long-term use caused by setting a thread on the mounting protrusion.

[0030] As attached Figure 5 As shown, the valve flap 5 is provided with a connecting shaft 16, which passes through the rocker arm 4 and is screwed together with a hexagonal nut 17 to lock the rocker arm 4 and the valve flap 5 together, wherein the connecting shaft 16 has a threaded portion that matches the hexagonal nut 17. The connection structure of this design is simple and reliable, and is very convenient to disassemble and assemble.

[0031] As attached Figure 5 As shown, a slot 18 is provided at the outer end of the connecting shaft 16, and a silicone block 19 is inserted into the slot 18. The silicone block 19 is a columnar structure, and the outer end of the silicone block 19 extends out of the slot 18, and the outer end of the silicone block 19 is in an arc shape. The silicone block 19 is arranged on the connecting shaft 16, which can further enhance the buffering effect when the valve disc 5 contacts the soft limit structure 7.

[0032] As attached Figure 5 As shown, the connecting shaft 16, the hexagonal nut 17 and the silicone block 19 are locked together by a latch 20. This design can prevent the hexagonal nut 17 and the silicone block 19 from loosening and improve the stability of the connection structure of the three.

[0033] As attached Figure 4As shown, the rocker arm 4 is provided with a transmission clutch sleeve 21, and the transmission clutch sleeve 21 is linked with the valve stem 3 through a flat key. The valve body 1 is coaxially provided with a first axial hole 22 and a second axial hole 23 for the valve stem 3 to pass through. The outer end of the first axial hole 22 is provided with a sealing groove 24, and a packing 25 is embedded in the sealing groove 24. The outer end of the sealing groove 24 is threadedly connected with a clamping nut 26 for pressing the packing 25 in the sealing groove 24. The outer end of the second axial hole 23 is provided with a limiting groove 27. The end of the valve stem 3 extending into the second axial hole 23 is provided with a limiting convex portion 28 extending outwardly, and a spacer 29 is provided in the limiting groove 27. The outer end of the limiting groove 27 is threadedly connected with a handle cap 30 for pressing the spacer 29, so that the spacer 29 presses the limiting convex portion 28 against the inner end of the limiting groove 27, and a sealing gasket 31 is also provided between the handle cap 30 and the valve body 1. This design can achieve stable coordination among the valve body 1, the valve stem 3 and the rocker arm 4, which not only has good sealing performance but is also very convenient for disassembly and assembly.

Claims

1. A hydraulic steam extraction valve, comprising a valve body (1), a valve cover (2), a valve stem (3), a rocker arm (4), a valve flap (5) and a hydraulic system (6), wherein the valve cover (2) is mounted on the upper part of the valve body (1), the valve stem (3) passes through the valve body (1), the hydraulic system (6) is linked to one end of the valve stem (3) for driving the valve stem (3) to rotate, the rocker arm (4) is arranged inside the valve body (1) and linked to the valve flap (5), and the valve flap (5) is mounted on the rocker arm (4); characterized in that: It also includes a soft limit structure (7) arranged inside the valve body (1) to limit the travel of the valve disc (5), the soft limit structure (7) includes a mounting protrusion (8) and a silicone buffer block (9), the mounting protrusion (8) is integrally arranged on the inner wall of the valve body (1), and the silicone buffer block (9) is provided with a mounting groove (10) that matches the mounting protrusion (8), so that the silicone buffer block (9) is covered on the outer periphery of the mounting protrusion (8).

2. The hydraulic steam extraction valve according to claim 1, characterized in that: The side of the silica gel buffer block (9) that contacts the valve flap (5) is in a curved shape.

3. The hydraulic steam extraction valve according to claim 1, characterized in that: The soft limit structure (7) also includes a connecting screw (11) and a connecting nut (12); a nut groove (13) having a shape matching the outer shape of the connecting nut (12) is provided on the silicone buffer block (9) at a position below the corresponding mounting groove (10); the connecting nut (12) is embedded in the nut groove (13); and a limit flange (14) extending inwardly for limiting the connecting nut (12) is provided at the lower end of the nut groove (13); and a limit flange (14) is provided at the upper end of the nut groove (13). There is a lower hole (37) connected to the mounting groove (10), an upper hole (38) is provided on the silicone buffer block (9) at a position corresponding to the position above the mounting groove (10), a middle hole (15) is provided on the mounting protrusion (8), the upper hole (38), the middle hole (15) and the lower hole (37) are coaxially arranged, and the screw portion of the connecting screw (11) passes through the upper hole (38), the middle hole (15) and the lower hole (37) in sequence and is threadedly matched with the connecting nut (12).

4. The hydraulic steam extraction valve according to claim 1, characterized in that: The valve flap (5) is provided with a connecting shaft (16), which passes through the rocker arm (4) and is threadedly connected with a hexagonal nut (17) to lock the rocker arm (4) and the valve flap (5) together.

5. The hydraulic steam extraction valve according to claim 4, characterized in that: The outer end of the connecting shaft (16) is provided with a slot (18), a silicone block (19) is inserted into the slot (18), the outer end of the silicone block (19) extends out of the slot (18), and the outer end of the silicone block (19) is in an arc shape.

6. The hydraulic steam extraction valve according to claim 5, characterized in that: The connecting shaft (16), the hexagonal nut (17) and the silica gel block (19) are locked together by a latch (20).

7. The hydraulic steam extraction valve according to claim 1, characterized in that: The rocker arm (4) is provided with a transmission clutch sleeve (21), and the transmission clutch sleeve (21) is linked to the valve stem (3) through a flat key. The valve body (1) is coaxially provided with a first shaft hole (22) and a second shaft hole (23) for the valve stem (3) to pass through. The outer end of the first shaft hole (22) is provided with a sealing groove (24), and a packing (25) is embedded in the sealing groove (24). The outer end of the sealing groove (24) is threadedly connected with a compression nut for pressing the packing (25) against the sealing groove (24). (26), a limiting groove (27) is provided at the outer end of the second axial hole (23), and a limiting protrusion (28) extending outward is provided at one end of the valve stem (3) extending into the second axial hole (23), and a spacer (29) is provided in the limiting groove (27), and a handle cap (30) for pressing against the spacer (29) is threadedly connected to the outer end of the limiting groove (27), so that the spacer (29) presses the limiting protrusion (28) against the inner end of the limiting groove (27), and a sealing gasket (31) is also provided between the handle cap (30) and the valve body (1).

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