阅读说明：本技术 汽轮机用多功能蝶阀 (Multifunctional butterfly valve for steam turbine ) 是由 陈晓雷 陈庆通 陈海耀 肖若橑 徐典 于 2019-11-12 设计创作，主要内容包括：本发明涉及一种汽轮机用多功能蝶阀,包括蝶阀和控制装置；其特征是：控制装置由气缸和压力控制阀组成；压力控制阀采用弹簧式安全阀,该弹簧式安全阀包括控制阀体、阀盖和压力整定装置,利用蝶阀进口通道的介质压力通过压力控制阀控制气缸的状态,自动控制蝶阀的开启或关闭,具有体积小、结构简单、成本低等特点。适用于汽轮机、水轮机、泵轴等系统介质管道上用来保护设备安全的多功能蝶阀。(The invention relates to a multifunctional butterfly valve for a steam turbine, which comprises a butterfly valve and a control device, wherein the butterfly valve is connected with the control device; the method is characterized in that: the control device consists of a cylinder and a pressure control valve; the pressure control valve adopts a spring type safety valve, the spring type safety valve comprises a control valve body, a valve cover and a pressure setting device, the state of the air cylinder is controlled by using the medium pressure of the inlet channel of the butterfly valve through the pressure control valve, the butterfly valve is automatically controlled to be opened or closed, and the spring type safety valve has the characteristics of small volume, simple structure, low cost and the like. The multifunctional butterfly valve is suitable for protecting equipment safety on system medium pipelines such as steam turbines, water turbines, pump shafts and the like.)

1. A multifunctional butterfly valve for a steam turbine comprises a butterfly valve and a control device, wherein the butterfly valve comprises a valve body (1), a butterfly plate (2) and a valve rod (3); the method is characterized in that: the control device consists of a cylinder and a pressure control valve; the cylinder comprises a cylinder body and a piston, the cylinder body consists of a left cylinder body (4) and a right cylinder body (5), the piston consists of a left piston (6) and a right piston (7), the left piston (6) and the right piston (7) are respectively arranged in the inner cavities of the left cylinder body (4) and the right cylinder body (5), the opposite planes of the left piston (6) and the right piston (7) are fixedly connected through a piston rod (8), the middle part of the piston rod (8) is connected with the valve rod (3) through a transmission device, and a spring (9) is arranged in a rodless cavity of the right cylinder body (5); the pressure control valve adopts a spring type safety valve, the spring type safety valve comprises a control valve body (12), a valve cover (13) and a pressure setting device, the inner cavity of the control valve body (12) is communicated with an inlet (14), a control port (15) and a discharge port (16), the inlet (14) is communicated with an inlet channel of the valve body (1) through a pipeline, the pressure setting device is arranged in the inner cavity of the valve cover (13), and the spring type safety valve structurally comprises an ejector rod (17), a spring (18) and an adjusting nut (19); the control port (15) is communicated with a rodless cavity of the left cylinder body (4) through a pipeline, a valve clack (20) is arranged at an inlet (14) of an inner cavity of the control valve body (12), an axial guide hole is formed between the inner cavity of the control valve body (12) and an inner cavity of the valve cover (13), a discharge port (16) is positioned on the side wall of the axial guide hole and communicated with the axial guide hole, the lower end of a mandril (17) penetrates through the axial guide hole to be in top contact with the center of the upper end face of the valve clack (20), a sealing face matched with the upper end face of the inlet (14) is arranged on the lower plane of the valve clack (20), and a sealing face matched with the.

2. The multi-function butterfly valve for steam turbines according to claim 1, wherein: the ejector rod (17) is matched with the axial guide hole in an axial guide way, and an axial flow passage for communicating the inner cavity of the control valve body (12) with the discharge port (16) is arranged between the matching surfaces of the ejector rod and the axial guide hole; the valve clack (20) is movably embedded in a guide hole between the inner cavity of the control valve body (12) and the inlet (14) of the control valve body, and an axial flow passage is arranged between the outer cylindrical surface of the valve clack (20) and the guide hole.

3. The multi-function butterfly valve for steam turbines according to claim 1, wherein: a guide post (21) is arranged in the axial guide hole, the lower end of the ejector rod (17) is arranged at the center of the upper end face of the guide post (21) in a propping manner, an ejector post (22) is arranged between the center of the lower end face of the guide post (21) and the center of the upper end face of the valve clack (20), and an axial flow channel for communicating the inner cavity of the control valve body (12) with the discharge port (16) is arranged between the outer cylindrical surface of the guide post (21) and the axial guide hole; the valve clack (20) is movably embedded in a guide hole between the inner cavity of the control valve body (12) and the inlet (14) of the control valve body, and an axial flow passage is arranged between the outer cylindrical surface of the valve clack (20) and the guide hole.

4. A multi-function butterfly valve for steam turbines according to claim 1, 2 or 3, characterized in that: the upper end of the ejector rod (17) is provided with an open valve locking device and a close valve locking device.

5. The multi-function butterfly valve for steam turbines according to claim 4, wherein: the valve opening locking device consists of a valve opening electromagnetic valve (23) and a valve opening connecting rod (24), the left end of the valve opening connecting rod (24) is hinged on the valve cover (13), the middle part of the valve opening connecting rod (24) is positioned below a lifting nut (27) fixedly arranged on the ejector rod (17), and the right end of the valve opening connecting rod (24) is hinged with the lower end of a driving rod of the valve opening electromagnetic valve (23); the valve closing locking device is composed of a valve closing electromagnetic valve (25) and a valve closing connecting rod (26), the left end of the valve closing connecting rod (26) is hinged to the lower end of a driving rod of the valve closing electromagnetic valve (25), the middle of the valve closing connecting rod (26) is hinged to a valve cover (13), the right end of the valve closing connecting rod (26) is located right above a mandril (17), and the valve closing electromagnetic valve (25) and the valve opening electromagnetic valve (23) are fixed on the valve body 1 through a mounting plate.

6. The multi-functional butterfly valve for steam turbines according to claim 1, 2, 3 or 5, characterized in that: the transmission device is composed of a shifting fork (11) fixed at the upper end of the valve rod (3) and a shifting lever (10) vertically fixed in the middle of the piston rod (8), and the shifting lever (10) is movably nested in a fork opening of the shifting fork (11).

7. The multi-function butterfly valve for steam turbines according to claim 4, wherein: the transmission device is composed of a shifting fork (11) fixed at the upper end of the valve rod (3) and a shifting lever (10) vertically fixed in the middle of the piston rod (8), and the shifting lever (10) is movably nested in a fork opening of the shifting fork (11).

Technical Field

The invention belongs to the field of valves, and particularly relates to a butterfly valve. The invention is suitable for a multifunctional butterfly valve used for protecting equipment safety on a gas medium pipeline of a steam turbine system.

Background

In addition to an opening/closing valve for controlling the on/off of fluid, a quick-closing/slow-closing check valve for preventing the reverse flow of a medium needs to be installed in a medium delivery pipe of a steam turbine system. At present, a hydraulic control butterfly valve is generally adopted in a steam turbine system, the hydraulic control butterfly valve structurally comprises a hydraulic station and a butterfly valve, and the hydraulic station controls the butterfly valve to be opened or closed so as to realize the on-off control and non-return control functions of fluid. The main disadvantages are complex structure, large product volume and high manufacturing cost.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the multifunctional butterfly valve for the steam turbine, which utilizes the pipeline medium to automatically control the opening, closing and non-return functions of the butterfly valve, and has the advantages of simple structure, small volume and low manufacturing cost.

The technical scheme of the invention comprises a butterfly valve and a control device, wherein the butterfly valve comprises a valve body, a butterfly plate and a valve rod; the method is characterized in that: the control device consists of a cylinder and a pressure control valve; the cylinder comprises a cylinder body and a piston, the cylinder body consists of a left cylinder body and a right cylinder body, the piston consists of a left piston and a right piston, the left piston and the right piston are respectively arranged in the inner cavities of the left cylinder body and the right cylinder body, the opposite planes of the left piston and the right piston are fixedly connected through a piston rod, the middle part of the piston rod is connected with a valve rod through a transmission device, and a spring is arranged in the rodless cavity of the right cylinder body; the pressure control valve adopts a spring type safety valve, the spring type safety valve comprises a control valve body, a valve cover and a pressure setting device, an inner cavity of the control valve body is communicated with an inlet, a control port and a discharge port, the inlet is communicated with an inlet channel of the valve body through a pipeline, the pressure setting device is arranged in the inner cavity of the valve cover, and the spring type safety valve structurally comprises an ejector rod, a spring and an adjusting nut; the control port is communicated with a rodless cavity of the left cylinder body through a pipeline, the inlet of the inner cavity of the control valve body is provided with a valve clack, an axial guide hole is arranged between the inner cavity of the control valve body and the inner cavity of the valve cover, the discharge port is positioned on the side wall of the axial guide hole, the lower end of the ejector rod is in top contact with the center of the upper end face of the valve clack, the lower plane of the valve clack is provided with a sealing surface matched with the upper end face of the inlet, and the upper plane.

In the technical scheme, the ejector rod is matched with the axial guide hole in an axial guide manner, and an axial flow passage for communicating the inner cavity of the control valve body with the discharge port is arranged between the matching surfaces of the ejector rod and the axial guide hole; the valve clack is movably embedded in a guide hole between the inner cavity of the control valve body and the inlet of the control valve body, and an axial flow passage is arranged between the outer cylindrical surface of the valve clack and the guide hole.

In the technical scheme, a guide post is arranged in an axial guide hole, the lower end of a mandril is jacked at the center of the upper end face of the guide post, the mandril is arranged between the center of the lower end face of the guide post and the center of the upper end face of a valve clack, and an axial flow passage for communicating an inner cavity of a control valve body with a discharge port is arranged between the outer cylindrical surface of the guide post and the axial guide hole; the valve clack is movably embedded in a guide hole between the inner cavity of the control valve body and the inlet of the control valve body, and an axial flow passage is arranged between the outer cylindrical surface of the valve clack and the guide hole.

In the technical scheme, the upper end of the ejector rod is provided with an open valve locking device and a close valve locking device.

In the above technical solution, the valve-opening locking device is composed of a valve-opening electromagnetic valve and a valve-opening connecting rod, the left end of the valve-opening connecting rod is hinged to the valve cover, the middle part of the valve-opening connecting rod is located below a lifting nut fixedly mounted on the ejector rod, and the right end of the valve-opening connecting rod is hinged to the lower end of a driving rod of the valve-opening electromagnetic valve; the valve closing locking device is composed of a valve closing electromagnetic valve and a valve closing connecting rod, the left end of the valve closing connecting rod is hinged to the lower end of a driving rod of the valve closing electromagnetic valve, the middle of the valve closing connecting rod is hinged to a valve cover, the right end of the valve closing connecting rod is located right above a push rod, and a valve body of the valve closing electromagnetic valve and a valve body of the valve opening electromagnetic valve are fixed on the valve body through mounting plates.

In the technical scheme, the transmission device consists of a shifting fork fixed at the upper end of the valve rod and a shifting rod vertically fixed in the middle of the piston rod, and the shifting rod is movably nested in a fork opening of the shifting fork.

Compared with the prior art, the invention has the beneficial effects that: the control device of the butterfly valve is composed of an air cylinder and a pressure control valve, the state of the air cylinder is controlled by the medium pressure of the inlet channel of the valve body through the pressure control valve, the butterfly valve is automatically controlled to be opened or closed, and the butterfly valve has the advantages of being small in size, simple in structure, low in cost and the like.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a schematic view of the cylinder of fig. 1 according to the present invention.

1. Valve body, 2, butterfly plate, 3, valve rod, 4, left cylinder, 5, right cylinder, 6, left piston, 7, right piston, 8, piston rod, 9, spring, 10, deflector rod, 11, shift fork, 12, control valve body, 13, valve cover, 14, inlet, 1,5, control port, 16, discharge port, 17, ejector rod, 18, spring, 19, adjusting nut, 20, valve clack, 21, guide column, 22, top column, 23, valve opening solenoid valve, 24, valve opening connecting rod, 25, valve closing solenoid valve, 26, valve closing connecting rod, 27 and lifting nut.

Detailed Description

The multifunctional butterfly valve for the steam turbine shown in the figure 1 comprises a butterfly valve and a control device, wherein the butterfly valve comprises a valve body 1, a butterfly plate 2 and a valve rod 3, and the butterfly valve adopts a three-eccentric structure; the method is characterized in that: the control device consists of a cylinder and a pressure control valve; the cylinder comprises a cylinder body and a piston, the cylinder body consists of a left cylinder body 4 and a right cylinder body 5, the piston consists of a left piston 6 and a right piston, the left piston 6 and the right piston 7 are respectively arranged in the inner cavities of the left cylinder body 4 and the right cylinder body 5, the opposite planes of the left piston 6 and the right piston 7 are fixedly connected through a piston rod 8, so that the left piston 6 and the right piston 7 form a linkage structure, the middle part of the piston rod 8 is connected with the valve rod 3 through a transmission device, a spring 9 is arranged in a rodless cavity of the right cylinder body 5, when no pressure exists in the rodless cavity of the left cylinder body 4, the spring 9 pushes the left piston 6 and the right piston 7 to move rightwards, the piston; the pressure control valve adopts a spring type safety valve, the spring type safety valve comprises a control valve body 12, a valve cover 13 and a pressure setting device, the valve cover 13 is fixedly installed at the upper end of the valve body 12, an inner cavity of the control valve body 12 is communicated with an inlet 14, a control port 15 and a discharge port 16, the inlet 14 is communicated with an inlet channel of the valve body 1 through a pipeline, the pressure setting device is installed in the inner cavity of the valve cover 13, the pressure setting device structurally comprises an ejector rod 17, a spring 18 and an adjusting nut 19, the adjusting nut 19 is in threaded fit with an inner threaded hole at the center of the upper end of the valve cover through external threads, the upper end of the ejector rod 17 penetrates through a center hole of the adjusting nut 19 and extends out of the upper end face of the adjusting nut; the control port 15 is communicated with a rodless cavity of the left cylinder body 4 through a pipeline, a valve clack 20 is arranged at an inlet of an inner cavity of the control valve body 12, an axial guide hole is formed between the inner cavity of the control valve body 12 and an inner cavity of the valve cover 13, the discharge port 16 is positioned on the side wall of the axial guide hole and communicated with the axial guide hole, the lower end of the ejector rod 17 penetrates through the axial guide hole to be in contact with the center of the upper end face of the valve clack 20, a sealing face matched with the upper end face of the inlet 14 is arranged on the lower plane of the valve clack 20, and a sealing face. When the medium pressure of an inlet channel of the valve body 1 is smaller than the set pressure of the pressure setting device, the valve clack 20 is in pressing sealing fit with a sealing surface at the upper end of an inlet 14 under the action of the downward thrust of the ejector rod 17, a rodless cavity of the left cylinder body 4 is communicated with a discharge port 16 through a control port 15, an inner cavity of the control valve body 12 and an axial guide hole, the left piston 6 and the right piston 7 are positioned on the left side under the thrust of the spring 9, and the butterfly plate 2 is in a closed state; when the medium pressure of the inlet channel of the valve body 1 is greater than the set pressure of the pressure setting device, the valve clack 20 moves upwards under the action of the medium pressure of the inlet 14, the sealing surface of the upper plane of the valve clack is in sealing fit with the sealing surface of the lower plane of the axial guide hole to separate the inner cavity of the control valve body 12 from the discharge port 16, the medium of the inlet channel of the valve body 1 enters the rodless cavity of the left cylinder body 4 through the inlet 14 and the control port 15 to push the left piston 6 and the right piston 7 to move rightwards against the elastic force of the spring 9 to open the butterfly plate 2, and the automatic control of the opening, closing and non-return functions of the butterfly. The butterfly valve is particularly suitable for system working conditions such as a steam turbine, a water turbine and a pump station, when the steam turbine, the water turbine and the pump station are started, the pressure of the inlet channel of the valve body 1 rises, the butterfly valve is automatically opened, when the steam turbine, the water turbine and the pump station are stopped, the inlet channel of the valve body 1 loses pressure, the butterfly valve is automatically closed, media backflow is prevented, and the safety of equipment such as the steam turbine, the water turbine and the pump station is protected.

The ejector rod 17 is matched with the axial guide hole in an axial guide way, an axial flow channel for communicating the inner cavity of the control valve body 12 with the discharge port 16 is arranged between the matching surfaces of the ejector rod and the axial guide hole, the axial flow channel controls the discharge speed of medium pressure in the rodless cavity of the left cylinder body 4, and the slow closing function of the butterfly valve is realized; the valve clack 20 is movably embedded in a guide hole between the inner cavity of the control valve body 12 and the inlet 14 of the control valve body, so that the valve clack 20 moves up and down in the guide hole, an axial flow passage is arranged between the outer cylindrical surface of the valve clack 20 and the guide hole, and a medium at the inlet 14 enters the inner cavity of the control valve body 12 through the axial flow passage when the valve clack 20 is opened.

A guide post 21 is arranged in the axial guide hole, the lower end of the ejector rod 17 is arranged at the center of the upper end face of the guide post 21 in a propping manner, an ejector post 22 is arranged between the center of the lower end face of the guide post 21 and the center of the upper end face of the valve clack 20, and an axial flow passage for communicating the inner cavity of the control valve body 12 with the discharge port 16 is arranged between the outer cylindrical surface of the guide post 21 and the axial guide hole; the valve clack 20 is movably embedded in a guide hole between the inner cavity of the control valve body 12 and the inlet 14 of the control valve body, and an axial flow passage is arranged between the outer cylindrical surface of the valve clack 20 and the guide hole.

The upper end of the ejector rod 17 is provided with an open valve locking device and a close valve locking device.

The valve opening locking device consists of a valve opening electromagnetic valve 23 and a valve opening connecting rod 24, the left end of the valve opening connecting rod 24 is hinged on the valve cover 13, the middle part of the valve opening connecting rod 24 is positioned below a lifting nut 27 fixedly arranged on the ejector rod 17, the right end of the valve opening connecting rod 24 is hinged with the lower end of a driving rod of the valve opening electromagnetic valve 23, when the valve opening electromagnetic valve 23 is powered, the driving rod moves upwards to pull up the ejector rod 17, and the medium pressure of an inlet channel of the valve body 1 only needs to be larger than the elastic force of a; the valve closing locking device is composed of a valve closing electromagnetic valve 25 and a valve closing connecting rod 26, the left end of the valve closing connecting rod 26 is hinged to the lower end of a driving rod of the valve closing electromagnetic valve 25, the middle of the valve closing connecting rod 26 is hinged to the valve cover 13, the right end of the valve closing connecting rod 26 is located right above the ejector rod 17, when the valve closing electromagnetic valve 25 is powered on, the driving rod moves upwards, the left end of the valve closing connecting rod 26 rises and the right end of the valve closing connecting rod 26 presses downwards, the ejector rod 17 and the valve clack 20 are tightly pressed on the inlet 14, the valve clack 20 is prevented from being opened, the locking butterfly valve is in a closed state. The valve-closing solenoid valve 25 and the valve-opening solenoid valve 23 are fixed to the control valve body 12 via a mounting plate. The valve-closing solenoid valve 25 and the valve-opening solenoid valve 23 may be manually operated levers.

The transmission device is composed of a shifting fork 11 fixed at the upper end of the valve rod 3 and a shifting rod 10 vertically fixed in the middle of the piston rod 8, and the shifting rod 10 is movably nested in a fork opening of the shifting fork 11, as shown in figure 2. When the piston rod 8 moves left and right, the valve rod 3 is driven to rotate by 90 degrees through the shifting fork 11.