Multi-stage stop valve

Abstract

The utility model discloses a multi-stage stop valve, belongs to the technical field of stop valves, and solves the problem that the influence caused by threads needs to be changed so as to ensure the sealing effect when the stop valve is cut off. Comprising a valve body, an annular channel fixedly connected into the valve body, a valve seat fixedly connected with the valve body, a valve rod arranged in the valve seat in a penetrating mode and a valve clack fixedly connected to the lower end of the valve rod and located in the valve body, external threads are formed in the peripheral wall of the valve rod, and an adjusting assembly is arranged in the valve seat. An inner ring of the adjusting assembly is provided with an internal thread in threaded connection with the external thread, and the adjusting assembly can adjust the position of the internal thread in the length direction of the valve rod. The sealing performance of the valve is maintained by ensuring that the valve clack is tightly matched with the sealing ring, during secondary sealing, the handle drives the eccentric roller to rotate to apply downward acting force, hydraulic fluid transmits force, the height of the valve rod is finely adjusted to adjust the height of the valve clack, further tight matching is achieved, and the sealing effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of stop valves, in particular to a multi-stage stop valve. Background Art

[0002] The stop valve, also known as a check valve or a shut-off valve, is a common pipeline valve used to control the flow of fluid in a pipeline. Its main function is to cut off or release the fluid by opening or closing the valve. The stop valve is usually composed of a valve body, a valve cover, a valve disc, a valve stem, a seal and other components. Its structural design is designed to ensure that the fluid can be completely blocked when closed, and to provide the lowest possible resistance when open to ensure the normal operation of the pipeline system. The stop valve can be divided into manual, electric, pneumatic and other types according to its working principle. It is widely used in pipeline systems of liquids, gases and other fluids, such as water supply systems, petrochemicals, natural gas transportation, pharmaceutical industries and other fields. Its design and manufacturing must comply with relevant international standards and specifications to ensure the reliability, safety and durability of the valve. In industrial production and civil fields, stop valves play a vital role and play a key role in the normal operation and fluid control of pipeline systems.

[0003] In the prior art, an external thread is provided on the valve stem, and an internal thread is provided in the valve cover / valve seat, so that the valve stem can dive under the guidance of the thread. In the process of completing the dive, the valve stem drives the valve disc to move downward, so that it can block the channel in the valve body. However, there are several problems with the thread guidance method. 1. The essence of the thread is friction. After a long period of cooperation in diving and floating, the thread will inevitably be worn or become smooth and loose due to mutual friction, and the corresponding thread groove will become wider. Although the thread connection is coordinated, a slight loose displacement can still occur, resulting in the thread being unable to ensure that the valve stem drives the valve disc to completely block the channel in the valve body; 2. Each thread has a pitch. Under the guidance of the thread, each rotation will complete the floating or diving corresponding to a pitch distance. When the height position of the valve disc is finely adjusted, the adjustment of the valve stem with a large pitch will not be used. On the contrary, if the pitch is too small, although the height position adjustment of the valve stem and the valve disc is more accurate, the work efficiency is low, and the valve stem needs to be rotated more times.

[0004] Therefore, in summary, it is necessary to make changes to the influence caused by the threads to ensure the sealing effect when the stop valve is cut off.

[0005] Therefore, a multi-stage stop valve is proposed to solve or alleviate the above problems. Utility Model Content

[0006] The utility model aims to solve the shortcomings in the prior art and proposes a multi-stage stop valve.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A multi-stage stop valve comprises a valve body, an annular channel fixedly connected in the valve body, a valve seat fixedly connected to the valve body, a valve stem inserted in the valve seat, and a valve disc fixedly connected to the lower end of the valve stem and located in the valve body, the outer peripheral wall of the valve stem is provided with an external thread, the valve seat is provided with an adjustment component, the inner ring of the adjustment component has an internal thread threadedly connected to the external thread, and the adjustment component can adjust the position of the internal thread in the length direction of the valve stem.

[0009] Preferably, the valve seat has a through groove for the valve stem to pass through, and the inner ring of the through groove is provided with a circle of annular through grooves, the adjustment component includes an annular sleeve slidably connected in the annular through groove and having a width smaller than the groove width, and the internal thread is provided on the inner ring of the annular sleeve.

[0010] Preferably, an annular space is provided in the valve seat which is located on the outer ring of the annular through groove and is connected thereto, the regulating assembly also includes a lower annular piston slidably connected to the annular space, the annular sleeve is fixedly connected to the inner ring of the lower annular piston, and an upper annular piston located above the lower annular piston is also slidably connected to the annular space, the annular space between the upper annular piston and the lower annular piston is filled with hydraulic fluid, the lower annular piston is sealed to the inner and outer rings of the annular space, and the distance between the upper annular piston and the top surface of the annular space is adjustable.

[0011] Preferably, the adjustment assembly further comprises a pressure column fixedly connected to the top surface of the upper annular piston and penetrating the annular space to the outside, and the top surface of the valve seat is fixedly connected to an adjustment member for fixing and adjusting the top surface of the pressure column.

[0012] Preferably, the adjusting member includes a connecting seat fixedly connected to the top surface of the valve seat, a rotating shaft fixedly connected in the connecting seat, and an eccentric roller eccentrically connected to the outside of the rotating shaft, the eccentric roller contacts the top surface of the pressure column, and a handle is fixedly connected to the eccentric roller.

[0013] Preferably, a T-shaped sealing ring sleeve is embedded in the inner ring of the annular channel, a sealing rubber ring is embedded between the sealing ring sleeve and the inner ring of the annular channel, a concave surface is provided on the inner ring edge of the top surface of the sealing ring sleeve, a circle of lower sealing ring is fixedly connected in the groove, a circle of annular groove is provided on the outer ring of the valve disc, a circle of upper sealing ring is fixedly connected in the annular groove, and the upper sealing ring and the lower sealing ring can be arranged in coordination.

[0014] Preferably, the bottom surface of the valve flap is conical.

[0015] Preferably, an outer ring of the valve seat is fixedly connected with an arc-shaped connecting rod, an upper end of the connecting rod is fixedly connected with a sliding sleeve coaxially arranged with the valve seat, and the valve stem passes through the sliding sleeve.

[0016] Preferably, the upper end of the valve stem is fixedly connected with a turning handle.

[0017] The utility model has the following beneficial effects:

[0018] In actual use, the utility model can drive the valve stem to rotate by holding the turning handle. When the valve stem rotates, the external thread of the outer ring cooperates with the internal thread of the inner ring of the annular sleeve to guide the valve stem to move downward. When the valve stem moves downward, the valve disc is driven to drop together until the valve disc drops to the point where the upper sealing ring contacts the lower sealing ring. The two are elastically deformed together to reduce the gap between them as much as possible to ensure the sealing effect of the entire stop valve. When secondary sealing is required, the operator pulls the handle so that the handle drives the eccentric roller to rotate eccentrically, changes the outer diameter of the eccentric roller, and applies a force downward to the top surface of the pressure column, thereby increasing the friction force. It hinders the return of the pressure column and the rotation of the eccentric roller, drives the upper annular piston to move downward, squeezes the hydraulic fluid and transmits force. After the lower annular piston is squeezed by the bottom surface of the annular space, the upper annular piston and the pressure column further dive, increasing the contact area between the eccentric roller and the top surface of the pressure column, increasing the difficulty of the eccentric roller rotation, and the lower annular piston drives the annular sleeve to move downward. Through the cooperation of internal and external threads, the valve stem dives further to complete the fine adjustment of the valve disc height position, ensure that the valve disc is closely matched, reduce the gap, and maintain the sealing performance even if the thread pitch is large. When the thread is worn and loose, it can still effectively seal the valve disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0021] Figure 3 for Figure 1 Enlarged view of point B in the middle.

[0022] 1. Valve body; 2. Annular channel; 3. Valve seat; 4. Connecting rod; 5. Sliding sleeve; 6. Valve stem; 7. Turning handle; 8. Connecting seat; 9. Eccentric roller; 10. Rotating shaft; 11. Handle; 12. Pressure column; 13. Upper annular piston; 14. Annular space; 15. Lower annular piston; 16. Annular groove; 17. Annular sleeve; 18. Valve disc; 19. Conical surface; 20. Sealing rubber ring; 21. Sealing ring sleeve; 22. Lower sealing ring; 23. Ring groove; 24. Upper sealing ring. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] A multi-stage stop valve, such as Figure 1 As shown, it includes a valve body 1, an annular channel 2 fixedly connected in the valve body 1, a valve seat 3 fixedly connected to the valve body 1, a valve stem 6 inserted in the valve seat 3, and a valve disc 18 fixedly connected to the lower end of the valve stem 6 and located in the valve body 1, the upper end of the valve stem 6 is fixedly connected to a turning handle 7, the outer ring of the valve seat 3 is fixedly connected to an arc-shaped connecting rod 4, the upper end of the connecting rod 4 is fixedly connected to a sliding sleeve 5 coaxially arranged with the valve seat 3, and the valve stem 6 is arranged through the sliding sleeve 5.

[0025] like Figure 3 As shown, the bottom surface of the valve disc 18 is a conical surface 19, the inner ring of the annular channel 2 is embedded with a T-shaped sealing ring sleeve 21, a sealing rubber ring 20 is embedded between the sealing ring sleeve 21 and the inner ring of the annular channel 2, the top surface of the inner ring edge of the sealing ring sleeve 21 is provided with a concave surface, a circle of lower sealing ring 22 is fixedly connected in the groove, the outer ring of the valve disc 18 is provided with a circle of annular groove 23, a circle of upper sealing ring 24 is fixedly connected in the annular groove 23, and the upper sealing ring 24 and the lower sealing ring 22 can be arranged in coordination.

[0026] like Figure 2 As shown, the valve seat 3 has a through groove for the valve stem 6 to pass through, and the inner circle of the through groove is provided with a circle of annular through groove 16, and the valve seat 3 is provided with an annular space 14 located on the outer circle of the annular through groove 16 and connected thereto, and the outer peripheral wall of the valve stem 6 is provided with an external thread, and an adjusting component is arranged in the valve seat 3, and the inner circle of the adjusting component has an internal thread connected to the external thread, and the adjusting component can adjust the position of the internal thread in the length direction of the valve stem 6.

[0027] Specifically, the adjusting component includes an annular sleeve 17 which is slidably connected in the annular groove 16 and has a width smaller than the groove width, a lower annular piston 15 which is slidably connected in the annular space 14, and a pressure column 12 which is fixedly connected to the top surface of the upper annular piston 13 and penetrates the annular space 14 to the outside. The internal thread is provided in the inner ring of the annular sleeve 17, the annular sleeve 17 is fixedly connected to the inner ring of the lower annular piston 15, and the annular space 14 is also slidably connected with an upper annular piston 13 located above the lower annular piston 15. The annular space 14 between the upper annular piston 13 and the lower annular piston 15 is filled with hydraulic fluid. The lower annular piston 15 is sealed with the inner and outer rings of the annular space 14, and the distance between the upper annular piston 13 and the top surface of the annular space 14 is adjustable. The top surface of the valve seat 3 is fixedly connected with an adjusting member which fixes and adjusts the top surface of the pressure column 12.

[0028] The adjusting member includes a connecting seat 8 fixedly connected to the top surface of the valve seat 3, a rotating shaft 10 fixedly connected in the connecting seat 8, and an eccentric roller 9 eccentrically connected to the outside of the rotating shaft 10. The eccentric roller 9 contacts the top surface of the pressure column 12, and a handle 11 is fixedly connected to the eccentric roller 9.

[0029] In actual use of the utility model, the valve stem 6 is driven to rotate by holding the turning handle 7, and the sliding sleeve 5 connected by the connecting rod 4 and the valve seat 3 assists the valve stem 6 to play a certain guiding effect, so that the valve stem 6 can rotate and the movement during the diving and floating process can be more stable and less prone to shaking. When the valve stem 6 rotates, the external thread of its outer ring will cooperate with the internal thread of the inner ring of the annular sleeve 17, so as to guide the valve stem 6 to move downward. When the valve stem 6 moves downward, it will drive the valve disc 18 to move downward together. When the valve disc 18 descends, the conical surface 19 on its bottom surface can have a better breaking effect on the fluid, and the valve disc 18 In the process of descending and breaking the fluid, the directional force applied to the valve disc 18 and the valve stem 6 can be reduced, and the labor consumed by the operator when turning the valve stem 6 is reduced, until the valve disc 18 descends to make the upper sealing ring 24 and the lower sealing ring 22 conflict, and the two are elastically deformed together, thereby ensuring that the gap between the two can be reduced as much as possible, that is, the gap between the valve disc 18 and the annular channel 2 is reduced, thereby ensuring the sealing effect of the entire stop valve. When the stop valve needs to be sealed at a secondary level, the operator only needs to pull the handle 11, so that the handle 11 drives the eccentric roller 9 to eccentrically move on the outside of the rotating shaft 10. The eccentric roller 9 between the outer ring of the rotating shaft 10 and the top surface of the valve seat 3 rotates, and then the outer diameter of the eccentric roller 9 between the outer ring of the rotating shaft 10 and the top surface of the valve seat 3 changes. The eccentric roller 9 applies a downward force to the top surface of the pressure column 12, and the friction between the two hinders the return of the pressure column 12 and the rotation of the eccentric roller 9. The pressure column 12 drives the upper annular piston 13 to move downward, thereby squeezing the hydraulic fluid. The hydraulic fluid plays a role in force transmission, and then drives the lower annular piston 15 to move downward. When the lower annular piston 15 is located at the bottom surface of the annular space 14, the hydraulic fluid is squeezed by the squeezing force on both sides and is compressed to a certain extent, thereby ensuring that the upper annular piston 1 3 and the pressure column 12 can further dive, further increasing the contact area between the eccentric roller 9 and the top surface of the pressure column 12 to increase the difficulty of the eccentric roller 9 rotating, and then the lower annular piston 15 will drive the annular sleeve 17 to move downward, and the annular sleeve 17 will drive the valve stem 6 to dive further through the cooperation of the internal thread and the external thread, thereby completing the fine adjustment of the height position of the valve disc 18, and then making the valve disc 18 fit more closely and less likely to have a gap. In this way, even if the pitch of the thread is large, its sealing performance can be maintained, and the valve disc 18 can also be sealed when the thread is worn and loose.

[0030] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multi-stage stop valve, characterized in that: The invention comprises a valve body (1), an annular channel (2) fixedly connected to the valve body (1), a valve seat (3) fixedly connected to the valve body (1), a valve stem (6) inserted into the valve seat (3), and a valve flap (18) fixedly connected to the lower end of the valve stem (6) and located in the valve body (1), wherein an external thread is provided on the outer peripheral wall of the valve stem (6), an adjusting component is provided in the valve seat (3), an inner ring of the adjusting component has an internal thread connected to the external thread, and the adjusting component can adjust the position of the internal thread in the length direction of the valve stem (6).

2. A multi-stage stop valve according to claim 1, characterized in that: The valve seat (3) has a through groove for the valve stem (6) to pass through, and the inner ring of the through groove is provided with a circle of annular through groove (16), the adjustment component includes an annular sleeve (17) which is slidably connected in the annular through groove (16) and has a width smaller than the groove width, and the internal thread is provided on the inner ring of the annular sleeve (17).

3. A multi-stage stop valve according to claim 2, characterized in that: The valve seat (3) is provided with an annular space (14) located on the outer ring of the annular groove (16) and connected thereto. The regulating assembly further comprises a lower annular piston (15) slidably connected to the annular space (14). The annular sleeve (17) is fixedly connected to the inner ring of the lower annular piston (15). An upper annular piston (13) located above the lower annular piston (15) is also slidably connected to the annular space (14). The annular space (14) between the upper annular piston (13) and the lower annular piston (15) is filled with hydraulic fluid. The lower annular piston (15) is sealed with the inner and outer rings of the annular space (14), and the distance between the upper annular piston (13) and the inner top surface of the annular space (14) is adjustable.

4. A multi-stage stop valve according to claim 3, characterized in that: The regulating assembly also includes a pressure column (12) fixedly connected to the top surface of the upper annular piston (13) and penetrating the annular space (14) to the outside, and the top surface of the valve seat (3) is fixedly connected to an regulating member for fixing and adjusting the top surface of the pressure column (12).

5. A multi-stage stop valve according to claim 4, characterized in that: The regulating member comprises a connecting seat (8) fixedly connected to the top surface of the valve seat (3), a rotating shaft (10) fixedly connected inside the connecting seat (8), and an eccentric roller (9) eccentrically rotatably connected to the outside of the rotating shaft (10), wherein the eccentric roller (9) contacts the top surface of the pressure column (12), and a handle (11) is fixedly connected to the eccentric roller (9).

6. A multi-stage stop valve according to claim 1, characterized in that: The inner ring of the annular channel (2) is embedded with a T-shaped sealing ring sleeve (21), a sealing rubber ring (20) is embedded between the sealing ring sleeve (21) and the inner ring of the annular channel (2), a concave surface is provided on the inner ring edge of the top surface of the sealing ring sleeve (21), a circle of lower sealing ring (22) is fixedly connected in the concave surface, the outer ring of the valve disc (18) is provided with a circle of annular groove (23), an upper sealing ring (24) is fixedly connected in the annular groove (23), and the upper sealing ring (24) and the lower sealing ring (22) can be arranged in a coordinated manner.

7. A multi-stage stop valve according to claim 1, characterized in that: The bottom surface of the valve flap (18) is a conical surface (19).

8. The multi-stage stop valve according to claim 1, characterized in that: The outer ring of the valve seat (3) is fixedly connected to an arc-shaped connecting rod (4), the upper end of the connecting rod (4) is fixedly connected to a sliding sleeve (5) coaxially arranged with the valve seat (3), and the valve stem (6) is arranged to penetrate the sliding sleeve (5).

9. A multi-stage stop valve according to claim 1, characterized in that: The upper end of the valve stem (6) is fixedly connected to a turning handle (7).

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