A control assembly for a quick closing valve of a steam turbine

Abstract

The utility model relates to a steam turbine speed closing valve control assembly. It solves the problem of unstable pressure indication of the speed closing valve oil port and the difficulty of completely closing the valve core in the prior art. It comprises an oil outlet pipeline, an oil inlet pipeline and an oil outlet pipeline, an oil outlet branch pipe structure is connected to the oil outlet pipeline, an oil pressure measuring port is arranged on the oil outlet branch pipe structure, a logic valve is arranged at the intersection of the oil outlet pipeline, the oil inlet pipeline and the oil outlet pipeline, and a back oil on-off valve is arranged on the oil outlet pipeline. The utility model has the advantages of effectively relieving hydraulic impact, ensuring accurate pressure indication and stable closing of the valve core, achieving complete cut-off of the passage and good use effect.

Description

Technical Field

[0001] This utility model relates to the field of mechanical equipment technology, specifically to a steam turbine fast-closing valve control component. Background Technology

[0002] The quick-closing valve consists of a valve body and a cylinder. During operation, the quick-closing valve remains open by overcoming the resistance of the spring through quick-closing oil. When the quick-closing oil loses pressure, the piston disc in the cylinder will disengage from the piston under the force of the spring, and the quick-closing oil will be connected to the drain port, causing the quick-closing oil to leak out instantly and close the valve. The steam turbine extraction system uses the extraction quick-closing valve for control. Due to the need for control reliability, the quick-closing valve has a small amount of back leakage during operation. During operation, the leaked oil is collected in an iron drum and manually pumped back to the main oil tank using an oil filter. Because the iron drum has a limited capacity and the oil level in the drum cannot be accurately monitored, personnel need to periodically turn on the oil filter on-site to pump out the oil, which poses a serious risk of oil leakage and fire. The existing quick-closing valve oil return device requires manual on-site operation and cannot safely and reliably recover the oil leakage of each quick-closing valve, which brings unsafe factors and affects the safe operation of the unit. In addition, some oil ports of the existing quick-closing valve oil circuit system have hydraulic shock phenomenon, which leads to inaccurate pressure readings. When the cartridge valve control chamber wants to enter oil to close the valve core, the lower chamber is also entering oil and pushing the valve core upward, which makes it impossible for the valve core to close completely and the pressure cannot be completely cut off, resulting in poor performance.

[0003] To address the shortcomings of existing technologies, people have conducted long-term explorations and proposed various solutions. For example, Chinese patent literature discloses a quick-closing valve return oil device [CN201820262884.1], which includes a valve body. A valve stem is rotatably connected to the center of the valve body's inner cavity, and the valve stem is threaded to the valve body. A horizontal handwheel is connected to the top of the valve stem, and the handwheel is located directly above the valve body. A hydraulic cylinder is connected to the left side of the valve body via a flange. An oil outlet pipe is connected to the bottom of the hydraulic cylinder. A buffer tank is connected to the bottom of the oil outlet pipe. A low-level oil tank is connected to the bottom of the buffer tank via a conduit. An exhaust pipe is vertically connected to the top of the low-level oil tank, and the exhaust pipe is located on one side of the low-level oil tank. An oil pump is connected to the bottom left side of the low-level oil tank.

[0004] The above solution has solved the problem of leakage and operational safety issues caused by the medium-speed valve closing in the existing technology to a certain extent. However, the solution still has many shortcomings. For example, some oil ports have hydraulic shock, which leads to inaccurate pressure readings. In addition, the valve core cannot be completely closed, the pressure cannot be completely cut off, and the performance is not good. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a turbine fast-closing valve control component.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a turbine fast-closing valve control component, including an oil outlet line, an oil inlet line, and an oil outlet line. An oil outlet branch pipe structure is connected to the oil outlet line, and an oil pressure measuring port is provided on the oil outlet branch pipe structure. A logic valve is provided at the intersection of the oil outlet line, the oil inlet line, and the oil outlet line. A return oil opening and closing valve is provided on the oil outlet line.

[0007] In the aforementioned turbine fast-closing valve control assembly, the oil outlet branch pipe structure includes a vertically arranged vertical return oil pipe connected to the oil outlet circuit, a horizontal guide oil pipe is provided on one side of the vertical return oil pipe, the horizontal guide oil pipe is connected to an oil pressure detection branch pipe, and an oil pressure measuring port is provided on the oil pressure detection branch pipe.

[0008] In the aforementioned turbine quick-closing valve control assembly, a return oil tank is connected to the bottom of the vertical return oil pipe, and a return oil control valve is provided between the return oil tanks.

[0009] In the aforementioned turbine quick-closing valve control assembly, the end of the horizontal oil guide pipe away from the vertical return oil pipe is connected to the return oil tank via a detection oil return pipe, and a reflux control valve is provided between the return oil tank and the detection oil return pipe.

[0010] In the aforementioned turbine fast-closing valve control assembly, the logic valve includes a reversing valve and a cartridge valve that are connected by a plug-in joint, and a linkage valve core is provided on the inner side of the cartridge valve in the circumferential direction.

[0011] In the aforementioned turbine quick-closing valve control assembly, the cartridge valve has an oil inlet port connected to the oil inlet pipeline at the end away from the reversing valve, an oil outlet port connected to the oil outlet pipeline at the upper end of the cartridge valve, and an oil outlet port connected to the oil outlet pipeline at the lower end of the cartridge valve. The oil outlet port and the oil outlet connection port are located on the same axis.

[0012] In the aforementioned turbine quick-closing valve control assembly, the end face of the linkage valve core facing the reversing valve is provided with several arc-shaped force-bearing arc surfaces, and the bottom of the linkage valve core is provided with a plug-in through hole, in which a positioning screw is inserted, and the inner side of the linkage valve core has a top pressure chamber that communicates with the plug-in through hole.

[0013] In the aforementioned turbine fast-closing valve control assembly, the end of the linkage valve core has several reversing channels for switching the oil inlet port, the oil outlet port, and the connection between the oil outlet ports.

[0014] In the aforementioned turbine fast-closing valve control assembly, the reversing valve includes a reversing valve seat that is snapped onto the outer circumferential side of one end of the cartridge valve. The reversing valve seat has a plug-in connection channel on its axis, and a reversing linkage valve stem is provided in the plug-in connection channel.

[0015] In the aforementioned turbine quick-closing valve control assembly, a tension spring is provided inside the top pressure chamber and on the outer circumferential side of the reversing linkage valve stem. One end of the tension spring is positioned by the aforementioned positioning screw, and the other end is positioned by a slot provided at the end of the reversing valve seat. A gasket is provided between the end of the tension spring and the bottom of the top pressure chamber.

[0016] Compared with the prior art, the advantages of this utility model are as follows: the addition of a horizontal oil guide pipe, an oil pressure detection branch pipe, and a return flow control valve to the return oil branch pipe can alleviate hydraulic shock and ensure accurate pressure readings; secondly, the logic valve adopts a combination of a directional valve and a cartridge valve, and the force-bearing arc surface of the linkage valve core can balance the force and increase the force-bearing area. The mutual use of the top pressure chamber, the positioning screw, and the tension spring can avoid the situation where the lower chamber is pushed upward when the cartridge valve control chamber closes the valve core, ensuring stable valve core closure and achieving the purpose of completely cutting off the passage, resulting in good performance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the oil outlet branch pipe structure in this utility model;

[0018] Figure 2 This is a schematic diagram of the logic valve in this utility model;

[0019] Figure 3 This is a cross-sectional view of the logic valve in this utility model;

[0020] Figure 4 This is a schematic diagram of the present invention;

[0021] In the diagram: Oil outlet line 1, oil inlet line 2, oil outlet line 3, oil outlet branch pipe structure 4, oil pressure test port 41, vertical return oil pipe 42, horizontal guide oil pipe 43, detection oil return pipe 431, return flow control valve 432, oil pressure detection branch pipe 44, return oil tank 45, return oil control valve 451, logic valve 5, reversing valve 51, reversing valve seat 511, plug-in connection channel 512, reversing linkage valve stem 513, tension spring 514, slot positioning 515, gasket 516, cartridge valve 52, oil inlet plug-in interface 521, oil outlet connection port 522, oil outlet plug-in interface 523, linkage valve core 53, force-bearing arc surface 531, plug-in through hole 532, positioning screw 533, top pressure chamber 534, reversing channel 535. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1-4As shown, a turbine fast-closing valve control assembly includes an oil outlet line 1, an oil inlet line 2, and an oil outlet line 3. An oil outlet branch pipe structure 4 is connected to the oil outlet line 1, and an oil pressure measuring port 41 is provided on the oil outlet branch pipe structure 4. A logic valve 5 is provided at the intersection of the oil outlet line 1, the oil inlet line 2, and the oil outlet line 3. A return oil on / off valve 11 is provided on the oil outlet line 1.

[0024] The oil outlet branch pipe structure 4 includes a vertically arranged vertical return oil pipe 42 connected to the oil outlet oil passage 1. A horizontal oil guide pipe 43 is provided on one side of the vertical return oil pipe 42. The horizontal oil guide pipe 43 is connected to an oil pressure detection branch pipe 44. An oil pressure measuring port 41 is provided on the oil pressure detection branch pipe 44.

[0025] The vertical return oil pipe 42 is connected to the oil outlet oil circuit 1. The horizontal guide oil pipe 43 leads out the oil pressure detection branch pipe 44 and is connected to the oil pressure detection branch pipe 44. The oil pressure test port 41 is set on the oil pressure detection branch pipe 44 to provide a stable branch oil circuit channel for oil pressure detection.

[0026] Obviously, the bottom of the vertical return oil pipe 42 is connected to the return oil tank 45, and a return oil control valve 451 is provided between the return oil tank 45 and the return oil tank 45.

[0027] The return oil control valve 451 adjusts the return oil flow state and rate between the return oil tanks based on the return oil pressure detected by the oil pressure measuring port 41, so as to ensure the return oil effect.

[0028] As can be seen, the end of the horizontal oil guide pipe 43 away from the vertical oil return pipe 42 is connected to the oil return tank 45 through the detection oil return pipe 431, and a reflux control valve 432 is provided between the oil return tank 45 and the detection oil return pipe 431.

[0029] Furthermore, the logic valve 5 includes a directional valve 51 and a cartridge valve 52 that are connected by a plug-in connection, and a linkage valve core 53 is provided on the inner side of the cartridge valve 52 in the circumferential direction.

[0030] Specifically, the cartridge valve 52 is provided with an oil inlet port 521 connected to the oil inlet pipeline 2 at one end away from the reversing valve 51, the upper end of the cartridge valve 52 is provided with an oil outlet port 522 connected to the oil outlet pipeline 3, and the lower end of the cartridge valve 52 is provided with an oil outlet port 523 connected to the oil outlet pipeline 1. The oil outlet port 523 and the oil outlet port 522 are located on the same axis.

[0031] Furthermore, the end face of the linkage valve core 53 facing the reversing valve 51 is provided with several arc-shaped force-bearing arc surfaces 531, and the bottom of the linkage valve core 53 is provided with a plug-in through hole 532, in which a positioning screw 533 is inserted, and the inner side of the linkage valve core 53 has a top pressure chamber 534 that communicates with the plug-in through hole 532.

[0032] The force-bearing arc surface 531 of the linkage valve core 53 is used to balance the force under oil pressure and increase the force-bearing area in the initial state.

[0033] More specifically, the end of the linkage valve core 53 has several reversing channels 535 for switching the connection between the oil inlet port 521, the oil outlet port 522 and the oil outlet port 523.

[0034] The reversing channel 535 at the end of the linkage valve core 53 can switch positions through the movement of the valve core to realize the conversion of the connection relationship between the oil inlet, oil outlet, and oil outlet plug interface, thereby achieving oil circuit reversing control.

[0035] The reversing channel 535 at the end of the linkage valve core 53 can switch positions through the movement of the valve core to realize the conversion of the connection relationship between the oil inlet, oil outlet, and oil outlet plug interface, thereby achieving oil circuit reversing control.

[0036] In detail, the reversing valve 51 includes a reversing valve seat 511 that is snapped onto the outer side of one end of the cartridge valve 52. The reversing valve seat 511 has a plug-in connection channel 512 on its axis, and a reversing linkage valve stem 513 is provided in the plug-in connection channel 512.

[0037] The axial movement of the reversing linkage valve stem 513 within the plug-in connection channel 512 transmits reversing power to the linkage valve core 53.

[0038] Preferably, a tension spring 514 is provided inside the top pressure chamber 534 and on the outer side of the reversing linkage valve stem 513. One end of the tension spring 514 is positioned by the aforementioned positioning screw 533 and the other end is positioned by a slot 515 provided at the end of the reversing valve seat 511. A gasket 516 is provided between the end of the tension spring 514 and the bottom of the top pressure chamber 534.

[0039] In summary, the principle of this embodiment is as follows: A horizontal oil guide pipe 43 and an oil pressure detection branch pipe 44 are provided to offer a stable branch channel for oil pressure detection, preventing hydraulic shock and improving the stability of pressure detection. Furthermore, the return oil speed can be adjusted using the detection oil return pipe 431 and the vertical return oil pipe 42 according to the oil pressure, ensuring the stability of the detection oil circuit. Secondly, a tension spring 514 and a washer 516 are respectively provided to provide reset elasticity for the linkage valve core 53 and to buffer contact force, ensuring reset stability and motion accuracy.

[0040] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0041] Although this article uses a lot of terms such as oil outlet circuit 1, oil inlet pipe 2, oil outlet pipe 3, oil outlet branch pipe structure 4, oil pressure test port 41, vertical return oil pipe 42, horizontal guide oil pipe 43, detection oil return pipe 431, reflux control valve 432, oil pressure detection branch pipe 44, return oil tank 45, return oil control valve 451, logic valve 5, reversing valve 51, reversing valve seat 511, plug-in connection channel 512, reversing linkage valve stem 513, tension spring 514, slot positioning 515, gasket 516, cartridge valve 52, oil inlet plug-in interface 521, oil outlet connection port 522, oil outlet plug-in interface 523, linkage valve core 53, force-bearing arc surface 531, plug-in through hole 532, positioning screw 533, top pressure chamber 534, reversing channel 535, etc., the possibility of using other terms cannot be ruled out. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would be contrary to the spirit of this utility model.

Claims

1. A turbine speed-closing valve control assembly, comprising an oil outlet line (1), an oil inlet line (2), and an oil outlet line (3), characterized in that, The oil outlet circuit (1) is connected to an oil outlet branch pipe structure (4), and an oil pressure test port (41) is provided on the oil outlet branch pipe structure (4). A logic valve (5) is provided at the intersection of the oil outlet circuit (1), the oil inlet pipe (2) and the oil outlet pipe (3). A return oil on / off valve (11) is provided on the oil outlet circuit (1).

2. The turbine fast-closing valve control assembly according to claim 1, characterized in that, The oil outlet branch pipe structure (4) includes a vertically arranged vertical return oil pipe (42) connected to the oil outlet oil passage (1). A horizontal guide oil pipe (43) is provided on one side of the vertical return oil pipe (42). The horizontal guide oil pipe (43) is connected to an oil pressure detection branch pipe (44). The oil pressure measuring port (41) is provided on the oil pressure detection branch pipe (44).

3. The turbine fast-closing valve control assembly according to claim 2, characterized in that, The bottom of the vertical return oil pipe (42) is connected to the return oil tank (45), and a return oil control valve (451) is provided between the return oil tank (45) and the return oil tank (45).

4. The turbine fast-closing valve control assembly according to claim 3, characterized in that, The end of the horizontal oil guide pipe (43) away from the vertical return oil pipe (42) is connected to the return oil tank (45) through the detection oil return oil pipe (431), and a return flow control valve (432) is provided between the return oil tank (45) and the detection oil return oil pipe (431).

5. A turbine fast-closing valve control assembly according to claim 1, characterized in that, The logic valve (5) includes a reversing valve (51) and a cartridge valve (52) connected by a plug-in connection. The cartridge valve (52) has a linkage valve core (53) arranged on its inner circumferential side.

6. A turbine fast-closing valve control assembly according to claim 5, characterized in that, The cartridge valve (52) is provided with an oil inlet port (521) connected to the oil inlet pipeline (2) at one end away from the reversing valve (51). The upper end of the cartridge valve (52) is provided with an oil outlet port (522) connected to the oil outlet pipeline (3), and the lower end of the cartridge valve (52) is provided with an oil outlet port (523) connected to the oil outlet pipeline (1). The oil outlet port (523) and the oil outlet port (522) are located on the same axis.

7. A turbine fast-closing valve control assembly according to claim 6, characterized in that, The linkage valve core (53) has several arc-shaped force-bearing arc surfaces (531) on one end face facing the reversing valve (51), and the bottom of the linkage valve core (53) has a plug-in through hole (532). A positioning screw (533) is inserted into the plug-in through hole (532), and the linkage valve core (53) has a top pressure cavity (534) that communicates with the plug-in through hole (532) on the inner circumferential side.

8. A turbine fast-closing valve control assembly according to claim 6, characterized in that, The linkage valve core (53) has several reversing channels (535) at its end for switching the connection between the oil inlet port (521), the oil outlet port (522), and the oil outlet port (523).

9. A turbine fast-closing valve control assembly according to claim 7, characterized in that, The reversing valve (51) includes a reversing valve seat (511) that is snapped onto the outer side of one end of the cartridge valve (52). The reversing valve seat (511) has a plug-in connection channel (512) on its axis, and a reversing linkage valve stem (513) is provided in the plug-in connection channel (512).

10. A turbine speed-closing valve control assembly according to claim 9, characterized in that, A tension spring (514) is provided inside the top pressure chamber (534) and on the outer side of the reversing linkage valve stem (513). One end of the tension spring (514) is positioned by the positioning screw (533) and the other end is positioned by the slot (515) provided at the end of the reversing valve seat (511). A gasket (516) is provided between the end of the tension spring (514) and the bottom of the top pressure chamber (534).

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