On-off combined steam regulating valve device

Abstract

The present application relates to a kind of on-off flow combined steam regulating valve device, including steam chamber, valve seat, oil cylinder connecting body, piston valve rod connecting device, main oil motor piston, intermediate oil motor spool, tension spring, top rod, lower shell, tension spring rod, main oil motor spring, valve rod, the steam chamber, oil cylinder connecting body and lower shell are all connected by bolt, the valve rod is connected together with main oil motor piston by piston valve rod connecting device, the main oil motor piston is connected intermediate oil motor spool, intermediate oil motor spool is connected tension spring rod by top rod and tension spring.The device of the present application is small in size, compact structure, easy to replace installation as a whole, steam regulating valve valve, main oil motor and intermediate oil motor are integrated together, which can be applied to small ship turbine in the equipment space requirement more demanding.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of hydraulic steam regulating valve devices of steam turbine, especially a kind of on-off combined steam regulating valve device. BACKGROUND

[0002] Hydraulic steam regulating valve devices of steam turbine, generally, is designed separately with actuator, such as oil motor. The opening degree of steam regulating valve can be divided into two forms, flow-through type and flow-break type. Both forms have advantages and disadvantages, flow-break type structure is suitable for large power unit, positioning ability is good, oil consumption is less, and lever feedback is needed. Flow-through type structure can be connected by hydraulic pressure, and does not need lever to transfer feedback, but positioning ability is poor, and oil consumption is larger. In industry, in order to use the advantages of both, flow-through and flow-break combined design structure is generated. At present, the commonly used flow-through and flow-break combined form is flow-through spool, intermediate oil motor and flow-break type main oil motor are arranged separately. At present, this kind of flow-through and flow-break combined structure is mainly used in large power unit, and needs larger arrangement space when used in small unit, so that the structure size of unit is too large, especially in ship equipment, which is not suitable. Therefore, it is necessary to design a flow-through and flow-break combined structure to combine intermediate oil motor, main oil motor and steam regulating valve into one, so that the regulating device is more compact, and is suitable for small steam turbine with high requirement on equipment installation space in ship. SUMMARY

[0003] The present application provides a kind of flow-through and flow-break combined steam regulating valve device, which indirectly controls the position of flow-break type main oil motor piston by control oil pressure, can improve the positioning ability of main oil motor piston, and enhance the anti-interference ability.

[0004] To achieve the above object, the technical scheme of the present application is as follows: a kind of flow-through and flow-break combined steam regulating valve device, comprising steam chamber, valve seat, oil cylinder connecting body, piston valve rod connecting device, main oil motor piston, intermediate oil motor spool, tension spring, top rod, lower shell, tension spring rod, main oil motor spring and valve rod, the steam chamber, oil cylinder connecting body and lower shell are connected by bolts, the valve rod and main oil motor piston are connected together by piston valve rod connecting device, the main oil motor piston is connected with intermediate oil motor spool, and the intermediate oil motor spool is connected with tension spring rod by top rod and tension spring.

[0005] Further, the rear end of the lower shell is connected with threaded sleeve, and the rear end of the tension spring rod is connected with adjustment indicating rod to form valve opening limiting mechanism.

[0006] Further, the left and right positions of the tension spring rod are changed by rotating the threaded sleeve, so as to change the limit position of the intermediate oil motor spool, and further change the limit position of the main oil motor piston, i.e. the limit opening of the valve.

[0007] Further, a guide key is arranged between the tension spring rod and the threaded sleeve.

[0008] Furthermore, when the valve stem is in the closed state, it is pressed against the valve seat in the steam chamber.

[0009] Furthermore, the combined on / off steam regulating valve device is equipped with a drain port and a valve stem steam extraction port, as well as corresponding high-pressure oil for power oil, an oil inlet for opening the valve, a quick-closing return port, an oil leakage port, a control oil pressure port, and a pressure gauge connection port.

[0010] The beneficial effects of this invention are:

[0011] The device of this invention includes a regulating valve structure, a main hydraulic actuator structure, and an intermediate hydraulic actuator structure. The regulating valve is used to open the steam passage, and the amount of steam entering is controlled by the opening degree. The main hydraulic actuator is a flow-interrupting actuator connected to the valve stem, driving the valve to open and close. The intermediate hydraulic actuator is a spool valve with a spring structure, which controls the position of the spool valve by controlling the balance between oil pressure and spring force, thereby controlling the position of the piston of the main hydraulic actuator, and controlling the oil pressure to be the flow-through branch oil pressure.

[0012] The device of the present invention is small in size, compact in structure, and easy to replace and install as a whole. It integrates the steam regulating valve, the main oil actuator and the intermediate oil actuator together, and can be applied to small marine steam turbines with strict requirements for equipment space. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the on / off combined steam regulating valve device of the present invention;

[0014] Figure 2 This is a diagram showing the intermediate hydraulic actuator slide valve moving to the left to open the valve wider;

[0015] Figure 3 This is a schematic diagram showing the intermediate hydraulic actuator slide valve moving to the right to achieve a dynamic equilibrium state.

[0016] Figure 4 This is a diagram showing the intermediate hydraulic actuator slide valve moving to the right to close the valve slightly. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] like Figure 1 As shown in the figure, the present invention provides a combined on / off steam regulating valve device, comprising a steam chamber 1, a valve seat 2, a cylinder connecting body 3, a piston valve rod connecting device 4, a main oil motor piston 5, an intermediate oil motor slide valve 6, a tension spring 7, a push rod 8, a lower housing 9, a tension spring rod 10, a sealing element 11, a sealing clamping element 12, a threaded sleeve 13, an adjustment indicator rod 14, a guide key 15, a main oil motor spring 16, and a valve rod 17.

[0019] The steam chamber 1, the cylinder connecting body 3, and the lower housing 9 are all connected by bolts. A threaded sleeve 13 is connected to the rear end of the lower housing 9. The valve stem 17 is connected to the main hydraulic actuator piston 5 via a piston-valve stem connecting device 4. An intermediate hydraulic actuator slide valve 6 is connected inside the main hydraulic actuator piston 5. The intermediate hydraulic actuator slide valve 6 is connected to a tension spring rod 10 via a push rod 8 and a tension spring 7. An adjustment indicator rod 14 is connected to the rear end of the tension spring rod 10. A guide key 15 is provided between the tension spring rod 10 and the threaded sleeve 13.

[0020] The valve stem 17 is in the closed state and pressed against the valve seat 2 in the steam chamber 1. To ensure the normal operation of the steam regulating valve, the regulating valve is equipped with a drain port, a valve stem extraction port, and corresponding high-pressure oil, an oil inlet for opening the valve, a quick-closing return port, an oil leakage port, a control oil pressure port, and a pressure gauge connection port.

[0021] The device is equipped with a valve opening limit mechanism. By rotating the threaded sleeve 13, the left and right positions of the tension spring rod 10 can be changed, thereby changing the limit position of the intermediate hydraulic actuator slide valve, and consequently changing the limit position of the main hydraulic actuator piston, i.e., the limit opening of the valve. The guide key 15 acts as a guide key to ensure that the tension spring rod 10 can move axially when the threaded sleeve 13 is rotated.

[0022] like Figure 1 As shown, the invention device integrates a regulating valve, a main hydraulic motor, and an intermediate hydraulic motor, and also features a valve opening limit structure, allowing manual adjustment of the maximum valve opening.

[0023] In the static closed state, the intermediate hydraulic valve 6 is in contact with the push rod 8 under the tension of the tension spring 7, thus being in the right extreme position.

[0024] In this device, the main hydraulic actuator piston 5 automatically follows the intermediate hydraulic actuator slide valve 6, thereby controlling the position of the main hydraulic actuator piston 5 by controlling the position of the intermediate hydraulic actuator slide valve 6 through controlling the oil pressure, i.e., changing the valve opening.

[0025] Figure 2 The diagram shows the intermediate hydraulic actuator slide valve 6 moving to the left, opening the valve wider so that the rectangular window on the main hydraulic actuator piston 5 connects with the power oil inlet. Power oil enters through the rectangular window on piston 5 and enters the piston chamber, causing the piston to move to the left and opening the steam valve 17. As the piston continues to move to the left, the unit speed increases due to the wider valve opening, leading to an increase in control oil pressure. This pushes the intermediate hydraulic actuator slide valve 6 to the right until the slide valve shoulder coincides with the rectangular window, achieving a dynamic equilibrium state. (See diagram). Figure 3 As shown.

[0026] When the intermediate hydraulic valve is in Figure 4As shown, the intermediate hydraulic actuator slide valve 6 moves to the right, closing the valve direction. At this time, the rectangular window connects with the oil drain port, and the power oil in the piston chamber is discharged through the oil drain port, causing the main hydraulic actuator piston 5 to move to the right. Simultaneously, due to the valve closing, the unit speed decreases, and the control oil pressure also decreases accordingly. Under the force of the tension spring 7, the intermediate hydraulic actuator slide valve 6 moves to the left until the slide valve shoulder coincides with the rectangular window, reaching a dynamic equilibrium state. (See...) Figure 3 As shown.

Claims

1. A combined on / off steam regulating valve device, characterized in that: The device includes a steam chamber, valve seat, cylinder connector, piston-valve rod connector, main hydraulic actuator piston, intermediate hydraulic actuator slide valve, tension spring, push rod, lower housing, tension spring rod, main hydraulic actuator spring, and valve rod. The steam chamber, cylinder connector, and lower housing are all bolted together. The valve rod is connected to the main hydraulic actuator piston via the piston-valve rod connector. The intermediate hydraulic actuator slide valve is connected inside the main hydraulic actuator piston, and the intermediate hydraulic actuator slide valve is connected to the tension spring rod via the push rod and tension spring. A threaded sleeve is connected to the rear end of the lower housing, and an adjustment indicator rod is connected to the rear end of the tension spring rod to form a valve opening limit mechanism. The left and right positions of the tension spring rod are changed by rotating the threaded sleeve, thereby changing the limit position of the intermediate hydraulic actuator slide valve, and consequently changing the limit position of the main hydraulic actuator piston, i.e., the limit opening of the valve. The on / off combined steam regulating valve device is equipped with a drain port and a valve rod steam extraction port, as well as corresponding high-pressure oil for power, an oil inlet for opening the valve, a quick-closing return port, and an oil leakage port. Control the oil pressure port and connect the pressure gauge port; when the intermediate oil actuator slide valve moves to the left, the valve direction is widened, so that the rectangular window on the piston of the main oil actuator is connected to the power oil inlet. After the power oil enters, it enters the piston chamber through the rectangular window on the piston, thereby causing the piston to move to the left and opening the steam valve; as the piston continues to move to the left, the unit speed also increases due to the widening of the valve, which in turn increases the control oil pressure, thereby pushing the intermediate oil actuator slide valve to the right until the slide valve shoulder coincides with the rectangular window, reaching a dynamic equilibrium state; when the intermediate oil actuator slide valve moves to the right, the valve direction is narrowed. At this time, the rectangular window is connected to the oil drain port, and the power oil in the piston chamber is discharged through the oil drain port, causing the main oil actuator piston to move to the right. At the same time, due to the narrowing of the valve, the unit speed decreases, and the control oil pressure also decreases accordingly. The intermediate oil actuator slide valve moves to the left under the action of the tension spring until the slide valve shoulder coincides with the rectangular window, reaching a dynamic equilibrium state.

2. The on / off combined steam regulating valve device according to claim 1, characterized in that: A guide key is provided between the tension spring rod and the threaded sleeve.

3. The on / off combined steam regulating valve device according to claim 1, characterized in that: When the valve stem is in the closed state, it is pressed against the valve seat in the steam chamber.

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