Electric direct-drive balanced stop valve

Abstract

The utility model relates to the technical field of stop valves, in particular to an electric direct-drive balanced stop valve which comprises a first valve body, one end of a connecting rod penetrates through a strip-shaped hole and is provided with a port opening and closing device, a first sealing block is arranged on the lower surface of a valve clack mechanism, and a second sealing block is arranged on the surface of the first sealing block in a sliding connection mode. A groove is formed in the lower inner wall of the first valve body, the lower surface of the second sealing block makes contact with the surface of the lower inner wall of the groove, and a plurality of elastic connecting devices are arranged between the second sealing block and the valve clack mechanism. According to the elastic connecting device, when the second sealing block abuts against the lower inner wall of the groove, the spring is in a compressed state, at the moment, the connecting rod presses the limiting switch on the lower portion, the electric direct-drive mechanism stops starting, and when the limiting switch moves or the second sealing block is abraded, the spring can compensate the loss amount through the compression effect; and the good sealing performance of the balance type stop valve is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of globe valves, in particular to an electric direct-drive balanced globe valve. Background Art

[0002] The globe valve, also called a stop valve, is one of the most widely used valves. The globe valve is a core component in a hydraulic / pneumatic system and plays a role in controlling the on / off of a pipeline. Therefore, the requirements for the globe valve need to be correspondingly rapid, easy to control, and have reliable sealing. Among them, the sealing performance of the globe valve is particularly important.

[0003] For example, the authorized announcement number "CN113700921B" is a kind of electric direct-drive balanced globe valve. Although by designing a balanced valve flap mechanism, the pressure fluid at the inlet of the globe valve is introduced into the sealing cavity, so that when the globe valve is in the closed state, the pressure acting area above the balanced valve flap mechanism is larger than the pressure acting area below the balanced valve flap mechanism, thereby tightly pressing the sealing block at the inlet of the globe valve to ensure reliable sealing at the inlet of the globe valve. Two travel switches are provided at the upper and lower movement limit positions of the valve stem anti-rotation rod. When the valve stem anti-rotation rod moves to trigger the travel switch, it means that the globe valve reaches the maximum opening or is completely closed, and an electrical signal is output and returned to the upper computer for valve opening and closing judgment and further control. However, in the above process, when the position of the travel switch moves or the sealing block wears, it will cause the balanced valve flap mechanism to not close tightly, resulting in poor sealing of the balanced globe valve. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the defects existing in the prior art and propose an electric direct-drive balanced globe valve.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] Design an electric direct-drive balanced globe valve, which includes a first valve body. A valve cover is provided at the upper end of the first valve body. The first valve body and the valve cover are connected by bolts in a threaded manner. An inlet end is provided at the lower end of the first valve body. An outlet end is provided on one side surface of the first valve body. A plurality of mounting blocks are provided on the upper surface of the valve cover. An electric direct-drive mechanism is provided at the upper ends of the plurality of mounting blocks. A first driving rod is provided on the lower surface of the electric direct-drive mechanism. A strip-shaped hole is provided on one surface of one of the plurality of mounting blocks. A connecting rod is provided in the middle of the first driving rod. One end of the connecting rod penetrates through the strip-shaped hole and is provided with a port opening and closing device. An output pipe is communicated with one side surface of the port opening and closing device. The other side surface of the port opening and closing device is communicated with the outlet end. Limit switches are provided above and below the strip-shaped hole. The two limit switches are arranged on the mounting block. The lower end of the first driving rod penetrates through the valve cover and is provided with a valve flap mechanism. A valve sleeve is provided on the inner wall of the first valve body. The valve sleeve is slidably connected with the valve flap mechanism. A cavity is formed between the valve flap mechanism and the upper inner wall of the valve cover. A hole gap is provided between the valve flap mechanism and the first driving rod. The hole gap is communicated with the cavity. A first sealing block is provided on the lower surface of the valve flap mechanism. The first sealing block is communicated with the hole gap. A second sealing block is slidably connected to the surface of the first sealing block. A groove is provided on the lower inner wall of the first valve body. The lower surface of the second sealing block contacts the lower inner wall surface of the groove. A plurality of elastic connection devices are provided between the second sealing block and the valve flap mechanism. A liquid through hole is provided on the surface of the second sealing block. The liquid through hole is communicated with the hole gap.

[0007] Preferably, the elastic connection device includes a sliding rod. The upper end of the sliding rod is connected to the lower surface of the valve flap mechanism. A first limiting cavity is provided inside the upper part of the second sealing block. The lower end of the sliding rod 20 extends into the first limiting cavity 21 and is provided with a first limiting end block 22. A spring is sleeved outside the sliding rod. The upper end of the spring is connected to the lower surface of the valve flap mechanism. The lower end of the spring is connected to the upper surface of the second sealing block.

[0008] Preferably, a second limiting cavity is provided inside the second sealing block. A second limiting end block is provided inside the second limiting cavity. The upper surface of the second limiting end block is connected to the lower end of the first sealing block. A through hole is provided on the surface of the second limiting end block. The through hole is communicated with the liquid through hole.

[0009] Preferably, a covering block is annularly provided at the lower end of the valve flap mechanism. The inner wall of the covering block is slidably connected to the surface of the second sealing block.

[0010] Preferably, a sealing edge is annularly provided near the top end of the second sealing block. A sealing rubber pad is provided on the lower surface of the sealing edge.

[0011] Preferably, the port opening and closing device includes a second driving rod and a second valve body. The upper end of the second driving rod is connected to one end of a connecting rod. The two side surfaces, the outlet end, and the output pipeline of the second valve body correspond to and communicate with each other. The lower end of the second driving rod penetrates through the second valve body and is provided with a valve plate.

[0012] The electric direct-drive balanced globe valve proposed by the present utility model has the following beneficial effects: The provided elastic connection device first starts the electric direct-drive mechanism to move the first driving rod downward. When the second sealing block presses tightly against the lower inner wall of the groove, the spring is in a compressed state. At this time, the connecting rod presses the lower limit switch, and the electric direct-drive mechanism stops starting. When the position of the limit switch moves or the second sealing block wears, the spring will compensate for the loss through compression, preventing the second sealing block from not closing tightly and ensuring good sealing performance of the balanced globe valve. The provided port opening and closing device drives the second driving rod to move downward when the first driving rod moves downward, and further drives the valve plate to move downward, so that the valve plate blocks the outlet end and the output pipeline, playing a role in further sealing and also preventing the pressure in the output pipeline from being too high and causing backflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a structural cross-sectional view of the present utility model;

[0014] Figure 2 is an enlarged view of position A of the present utility model.

[0015] In the figure: the first valve body 1, the valve cover 2, the bolt 3, the inlet end 4, the outlet end 5, the mounting block 6, the electric direct-drive mechanism 7, the first driving rod 8, the strip-shaped hole 9, the connecting rod 10, the limit switch 11, the output pipeline 12, the valve flap mechanism 13, the valve sleeve 14, the cavity 15, the hole clearance 16, the first sealing block 17, the second sealing block 18, the liquid through hole 19, the sliding rod 20, the first limit cavity 21, the first limit end block 22, the spring 23, the second limit cavity 24, the second limit end block 25, the covering block 26, the sealing edge 27, the sealing gasket 28, the second driving rod 29, the second valve body 30, the valve plate 31, the groove 32. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0017] Refer to Figure 1-2, Electric direct-drive balanced globe valve, including a first valve body 1, a valve cover 2 is provided at the upper end of the first valve body 1, the first valve body 1 and the valve cover 2 are threadedly connected by bolts 3, and a sealing gasket is installed between the first valve body 1 and the valve cover 2. The threaded connection between the first valve body 1 and the valve cover 2 facilitates the installation and disassembly of the first valve body 1 and the valve cover 2. The lower end of the first valve body 1 is provided with an inlet end 4, and the fluid enters from this port. One side surface of the first valve body 1 is provided with an outlet end 5, and the fluid flows out from this port. The upper surface of the valve cover 2 is provided with a plurality of mounting blocks 6, and an electric direct-drive mechanism 7 is provided at the upper ends of the plurality of mounting blocks 6. A first driving rod 8 is provided on the lower surface of the electric direct-drive mechanism 7. The electric direct-drive mechanism 7 is a prior art, and the internal structure of the electric direct-drive mechanism 7 can make the first driving rod 8 perform linear motion. One surface of the plurality of mounting blocks 6 is provided with a strip hole 9. A connecting rod 10 is provided in the middle of the first driving rod 8. The strip hole 9 can make the connecting rod 10 move up and down along the inside of the strip hole 9, playing a role in limiting. One end of the connecting rod 10 penetrates through the strip hole 9 and is provided with a port opening and closing device. An output pipe 12 is communicated with one side surface of the port opening and closing device, and the other side surface of the port opening and closing device is communicated with the outlet end 5. The port opening and closing device plays a role in truncating the output pipe 12 and the outlet end 5. Limit switches 11 are provided above and below the strip hole 9. The limit switches 11 play a role in transmitting signals for opening and closing the balanced globe valve. When the upper limit switch 11 is triggered, the balanced globe valve is fully opened; when the lower limit switch 11 is triggered, the balanced globe valve is fully closed. The two limit switches 11 are provided on the mounting block 6.

[0018] The lower end of the first driving rod 8 penetrates through the valve cover 2 and is provided with a valve flap mechanism 13. A valve sleeve 14 is provided on the inner wall of the first valve body 1. The valve sleeve 14 is slidably connected to the valve flap mechanism 13. A cavity 15 is formed between the valve flap mechanism 13 and the upper inner wall of the valve cover 2. A hole gap 16 is provided between the valve flap mechanism 13 and the first driving rod 8. The hole gap 16 is communicated with the cavity 15. A first sealing block 17 is provided on the lower surface of the valve flap mechanism 13. The first sealing block 17 is communicated with the hole gap 16. A second sealing block 18 is slidably connected to the surface of the first sealing block 17. A groove 32 is provided on the lower inner wall of the first valve body 1. The lower surface of the second sealing block 18 is in contact with the lower inner wall surface of the groove 32. A plurality of elastic connection devices are provided between the second sealing block 18 and the valve flap mechanism 13. A liquid through hole 19 is provided on the surface of the second sealing block 18. The liquid through hole 19 is communicated with the hole gap 16. When the balanced globe valve is in the closed state, part of the pressure fluid sequentially passes through the liquid through hole 19, the first sealing block 17, and the hole gap 16 and enters the sealed cavity 15; when the pressure fluid enters this sealed cavity, it acts on the upper surface of the valve flap mechanism 13. Since the acting area on the upper surface of the valve flap mechanism 13 is larger than the pressure acting area on the lower surface of the second sealing block 18, a downward acting force is formed, pressing the second sealing block 18 against the groove 32, which is beneficial for sealing. Due to the action of the elastic connection devices, the second sealing block 18 is in close contact with the lower inner wall of the groove 32.

[0019] In this embodiment, the elastic connection device includes a sliding rod 20. The upper end of the sliding rod 20 is connected to the lower surface of the valve flap mechanism 13. A first limiting cavity 21 is provided inside the upper part of the second sealing block 18. The lower end of the sliding rod 20 extends into the first limiting cavity 21 and is provided with a first limiting end block 22. A spring 23 is sleeved outside the sliding rod 20. The upper end of the spring 23 is connected to the lower surface of the valve flap mechanism 13, and the lower end of the spring 23 is connected to the upper surface of the second sealing block 18.

[0020] In this embodiment, a second limiting cavity 24 is provided inside the second sealing block 18. A second limiting end block 25 is provided inside the second limiting cavity 24. The upper surface of the second limiting end block 25 is connected to the lower end of the first sealing block 17. The second limiting end block 25 is provided to limit the first sealing block 17. Through holes are provided on the surface of the second limiting end block 25, and the through holes are communicated with the liquid through holes 19.

[0021] In this embodiment, a covering block 26 is annularly provided at the lower end of the valve flap mechanism 13. The inner wall of the covering block 26 is slidably connected to the surface of the second sealing block 18. The covering block 26 serves to shield and protect the elastic connection device.

[0022] In this embodiment, a sealing edge 27 is annularly provided near the top end of the second sealing block 18. A sealing gasket 28 is provided on the lower surface of the sealing edge 27. The sealing gasket 28 has elasticity. By pressing down the sealing gasket 28 through the sealing edge 27, the sealing gasket 28 is further pressed against the lower inner wall of the first valve body 1, thereby playing a further sealing role.

[0023] In this embodiment, the port opening and closing device includes a second driving rod 29 and a second valve body 30. The upper end of the second driving rod 29 is connected to one end of the connecting rod 10. The two side surfaces of the second valve body 30 correspond to and are communicated with the outlet end 5 and the output pipeline 12 one by one. The lower end of the second driving rod 29 penetrates through the second valve body 30 and is provided with a valve plate 31. The provided port opening and closing device, when the first driving rod 8 moves downward, drives the second driving rod 29 to move downward, and further drives the valve plate 31 to move downward, so that the valve plate 31 blocks the outlet end 5 and the output pipeline 12, playing a further sealing role and also preventing the pressure in the output pipeline 12 from being too high and causing backflow.

[0024] Working principle: For the provided elastic connection device, first start the electric direct drive mechanism 7 to make the first driving rod 8 move downward. When the second sealing block 18 abuts against the lower inner wall of the groove 32, the spring 23 is in a compressed state. At this time, the connecting rod 10 presses the lower limit switch 11, and the electric direct drive mechanism 7 stops starting. When the position of the limit switch 11 changes or the second sealing block 18 is worn, the spring 23 will compensate for the loss through compression, and will not cause the second sealing block 18 to be not tightly closed, ensuring good sealing performance of this balanced globe valve.

[0025] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present utility model.

Claims

1. An electric direct-driven balanced stop valve, comprising a first valve body (1), characterized in that: A valve cover (2) is provided at the upper end of the first valve body (1), the first valve body (1) and the valve cover (2) are threadedly connected by bolts (3), an inlet end (4) is provided at the lower end of the first valve body (1), an outlet end (5) is provided on one side surface of the first valve body (1), a plurality of mounting blocks (6) are provided on the upper surface of the valve cover (2), an electric direct drive mechanism (7) is provided on the upper ends of the plurality of mounting blocks (6), a first drive rod (8) is provided on the lower surface of the electric direct drive mechanism (7), a strip hole (9) is provided on one surface of the plurality of mounting blocks (6), a connecting rod (10) is provided in the middle of the first drive rod (8), one end of the connecting rod (10) passes through the strip hole (9) and is provided with a port opening and closing device, one side surface of the port opening and closing device is connected to an output pipe (12), and the other side surface of the port opening and closing device is connected to the outlet end (5), limit switches (11) are provided above and below the strip hole (9), two limit switches (11) are arranged on the mounting block (6), and the lower end of the first drive rod (8) is provided with a connecting rod (10). The valve body (1) is provided with a valve flap mechanism (13) which penetrates the valve cover (2); a valve sleeve (14) is provided on the inner wall of the first valve body (1); the valve sleeve (14) is slidably connected to the valve flap mechanism (13); the valve flap mechanism (13) and the upper inner wall of the valve cover (2) form a cavity (15); a hole gap (16) is provided between the valve flap mechanism (13) and the first driving rod (8); the hole gap (16) is in communication with the cavity (15); a first sealing block (17) is provided on the lower surface of the valve flap mechanism (13); the ... The first sealing block (17) is connected to the hole gap (16); the surface of the first sealing block (17) is slidably connected to a second sealing block (18); the lower inner wall of the first valve body (1) is provided with a groove (32); the lower surface of the second sealing block (18) contacts the lower inner wall surface of the groove (32); a plurality of elastic connection devices are provided between the second sealing block (18) and the valve flap mechanism (13); the surface of the second sealing block (18) is provided with a liquid through hole (19); the liquid through hole (19) is connected to the hole gap (16).

2. The electric direct-drive balanced stop valve according to claim 1, characterized in that: The elastic connection device comprises a slide rod (20), the upper end of which is connected to the lower surface of the valve flap mechanism (13), a first limiting cavity (21) is provided inside the upper part of the second sealing block (18), the lower end of which extends into the first limiting cavity (21) and is provided with a first limiting end block (22), a spring (23) is sleeved on the outside of the slide rod (20), the upper end of which is connected to the lower surface of the valve flap mechanism (13), and the lower end of which is connected to the upper surface of the second sealing block (18).

3. The electric direct-drive balanced stop valve according to claim 1, characterized in that: A second limiting cavity (24) is provided inside the second sealing block (18), a second limiting end block (25) is provided inside the second limiting cavity (24), the upper surface of the second limiting end block (25) is connected to the lower end of the first sealing block (17), and a through hole is provided on the surface of the second limiting end block (25), and the through hole is connected to the liquid through hole (19).

4. The electric direct-drive balanced stop valve according to claim 1, characterized in that: A covering block (26) is provided in an annular shape at the lower end of the valve flap mechanism (13), and an inner wall of the covering block (26) is slidably connected to a surface of the second sealing block (18).

5. The electric direct-driven balanced stop valve according to claim 1, characterized in that: The second sealing block (18) is provided with a sealing edge (27) in an annular shape near the top end, and a sealing rubber pad (28) is provided on the lower surface of the sealing edge (27).

6. The electric direct-drive balanced stop valve according to claim 1, characterized in that: The port opening and closing device comprises a second driving rod (29) and a second valve body (30), wherein the upper end of the second driving rod (29) is connected to one end of the connecting rod (10), the two side surfaces of the second valve body (30) correspond to and are connected to the outlet end (5) and the output pipe (12), and the lower end of the second driving rod (29) passes through the second valve body (30) and is provided with a valve plate (31).

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