阅读说明：本技术 一种耐高压双重密封闸阀 (High pressure resistant double sealing gate valve ) 是由 吴晓丰 林飞 胡博武 黄庆杰 王光华 叶建克 于 2019-09-24 设计创作，主要内容包括：本发明公开了一种耐高压双重密封闸阀,包括阀体,阀体的内部设有第一流道、第二流道及第三流道,阀体的顶端安装有阀杆螺母,阀杆螺母的中部贯穿有阀杆,阀杆的顶端固定连接有手轮,阀杆的下部伸入阀体,阀杆的底端设有主阀瓣,阀体内部设有主阀座；第二流道内设有初密封机构,初密封机构包括固定于主阀瓣底部的转轴,转轴的下部设有周向齿条；第二流道内设有滑杆,第二流道的侧壁上开设有滑孔,滑杆的一端伸入滑孔内部,滑杆的另一端设有次阀瓣,第一流道与第二流道的交界处设有次阀座；滑杆上开设有长孔,转轴穿设在长孔内,且长孔的一侧壁上设有横向齿条,长孔的另一侧壁为光面。本发明具有良好的耐高压性能,并且本发明结构简单,制造成本低。(The invention discloses a high-pressure-resistant double-seal gate valve which comprises a valve body, wherein a first flow passage, a second flow passage and a third flow passage are arranged inside the valve body, a valve rod nut is arranged at the top end of the valve body, a valve rod penetrates through the middle part of the valve rod nut, a hand wheel is fixedly connected to the top end of the valve rod, the lower part of the valve rod extends into the valve body, a main valve flap is arranged at the bottom end of the valve rod, and a main valve seat is arranged inside the valve body; a primary sealing mechanism is arranged in the second flow passage and comprises a rotating shaft fixed at the bottom of the main valve flap, and a circumferential rack is arranged at the lower part of the rotating shaft; a sliding rod is arranged in the second flow passage, a sliding hole is formed in the side wall of the second flow passage, one end of the sliding rod extends into the sliding hole, a secondary valve clack is arranged at the other end of the sliding rod, and a secondary valve seat is arranged at the junction of the first flow passage and the second flow passage; the slide bar is provided with a long hole, the rotating shaft penetrates through the long hole, a transverse rack is arranged on one side wall of the long hole, and the other side wall of the long hole is a smooth surface. The invention has good high pressure resistance, simple structure and low manufacturing cost.)

1. A high-pressure-resistant double-seal gate valve comprises a valve body (1), wherein a liquid inlet (2) and a liquid outlet (3) are respectively arranged at two ends of the valve body (1), a first flow passage (4) communicated with the liquid inlet (2), a second flow passage (5) communicated with the liquid outlet (3) and a third flow passage (6) communicated with the first flow passage (4) and the second flow passage (5) are arranged in the valve body (1), a valve rod nut (8) is installed at the top end of the valve body (1), the valve rod nut (8) is limited through a yoke bush (9), a valve rod (7) penetrates through the middle of the valve rod nut (8), a hand wheel (10) is fixedly connected to the top end of the valve rod (7), the lower part of the valve rod (7) extends into the valve body (1), a main valve flap (11) is arranged at the bottom end of the valve rod (7), and a main valve seat (14) matched with the main valve flap (11) is arranged in the valve body (1); the method is characterized in that: the first flow channel (4) and the third flow channel (6) are arranged in parallel; a primary sealing mechanism (15) is arranged in the second flow passage (5), the primary sealing mechanism (15) comprises a rotating shaft (19) fixed at the bottom of the main valve flap (11), and circumferential racks (28) distributed in a circumferential array are arranged at the lower part of the rotating shaft (19); a sliding rod (20) is arranged in the second flow channel (5), a sliding hole (37) is formed in the side wall of the second flow channel (5), one end of the sliding rod (20) extends into the sliding hole (37), a secondary valve clack (23) is arranged at the other end of the sliding rod (20), and a secondary valve seat (32) is arranged at the junction of the first flow channel (4) and the second flow channel (5); the sliding rod (20) is provided with a long hole (25), the rotating shaft (19) penetrates through the long hole (25), a transverse rack (26) meshed with the circumferential rack (28) is arranged on one side wall of the long hole (25), the other side wall of the long hole (25) is a smooth surface, and the rotating shaft (19) drives the sliding rod (20) to move transversely when rotating.

2. The high pressure resistant double seal gate valve of claim 1, wherein: first runner (4) and third runner (6) all are 11 degrees contained angles with the horizontal plane, slide bar (20) are including tip (21) and horizontal segment (22), 11 degrees contained angles are personally submitted with the horizontal plane to tip (21) of slide bar (20).

3. The high pressure resistant double seal gate valve of claim 2, wherein: the bottom of the valve body (1) is provided with an obliquely arranged mounting hole (16), the mounting hole (16) is communicated with the second flow channel (5), the mounting hole (16) is in threaded connection with a sealing plug (17), and a threaded sealing ring (18) is clamped between the sealing plug (17) and the mounting hole (16).

4. The high pressure resistant double seal gate valve of claim 1, wherein: inferior disk seat (32) are the polytetrafluoroethylene material, and the outside of inferior disk seat (32) is equipped with collar (33), be equipped with annular mounting groove (34) on the inner wall of valve body (1), during the collar (33) embedding annular mounting groove (34) on inferior disk seat (32) and with annular mounting groove (34) interference fit.

5. The high pressure resistant double seal gate valve of claim 1, wherein: and an annular shoulder (35) used for propping against the secondary valve seat (32) is arranged on the inner wall of the valve body (1).

6. The high pressure resistant double seal gate valve of claim 1, wherein: the lower extreme of pivot (19) lateral wall screw thread is equipped with spacing ring (27), spacing ring (27) are fixed on main valve lamella (11) through the screw.

7. The high pressure resistant double seal gate valve of claim 1, wherein: a fixing column (30) is clamped at the tail end of a long hole (25) of the sliding rod (20), and an arc-shaped groove (29) for positioning the fixing column (30) is formed in the side wall of the long hole (25); one end of the fixed column (30) is arranged on the arc-shaped groove (29), and the other end of the fixed column (30) is provided with a first fixed ring (31) and extends into the sliding hole (37); a spring (38) is arranged in the sliding hole (37), a second fixing ring (36) is arranged on the inner end face of the sliding hole (37), one end of the spring (38) is fixed on the first fixing ring (31), and the other end of the spring (38) is fixed on the second fixing ring (36).

8. The high pressure resistant double seal gate valve of claim 1, wherein: the end face, opposite to the liquid inlet (2), of the secondary valve clack (23) is provided with a plurality of concentrically arranged circular ring bulges (24).

9. The high pressure resistant double seal gate valve of claim 1, wherein: the bottom of valve rod (7) is equipped with snap ring (12) that a plurality of cross-sections are the forked tail shape, be equipped with on main valve lamella (11) with valve rod (7) circular slot (39) that agree with mutually, still be equipped with on the lateral wall of circular slot (39) with snap ring (12) looks adaptation annular dovetail (13).

Technical Field

The invention relates to a gate valve, in particular to a high-pressure-resistant double-seal gate valve.

Background

The gate valve is a shutter plate, the moving direction of which is perpendicular to the fluid direction, and the gate valve can only be fully opened and fully closed, but cannot be adjusted and throttled. Gate valves are sealed by the contact of the valve seat and gate plate, and the sealing surface is usually welded with metal materials to increase wear resistance, such as 1Cr13, STL6, stainless steel, etc. The gate plate is divided into a rigid gate plate and an elastic gate plate according to the difference of the gate plate. The conventional common gate valve has poor high-pressure resistance, and is easy to leak in a high-pressure environment, so that the gate valve cannot stably operate in the high-pressure environment.

Disclosure of Invention

The invention aims to provide a high-pressure-resistant double-seal gate valve. The invention has good high pressure resistance, simple structure and low manufacturing cost, and is beneficial to wide popularization in the market.

The technical scheme of the invention is as follows: a high-pressure-resistant double-sealing gate valve comprises a valve body, wherein a liquid inlet and a liquid outlet are respectively arranged at two ends of the valve body, a first flow passage communicated with the liquid inlet, a second flow passage communicated with the liquid outlet and a third flow passage communicated with the first flow passage and the second flow passage are arranged in the valve body, a valve rod nut is arranged at the top end of the valve body and limited by a yoke bush, a valve rod penetrates through the middle part of the valve rod nut, a hand wheel is fixedly connected to the top end of the valve rod, the lower part of the valve rod extends into the valve body, a main valve clack is arranged at the bottom end of the valve rod, and a main valve seat; the first flow channel and the third flow channel are arranged in parallel; a primary sealing mechanism is arranged in the second flow channel and comprises a rotating shaft fixed at the bottom of the main valve flap, and circumferential racks distributed in a circumferential array are arranged at the lower part of the rotating shaft; a sliding rod is arranged in the second flow passage, a sliding hole is formed in the side wall of the second flow passage, one end of the sliding rod extends into the sliding hole, a secondary valve clack is arranged at the other end of the sliding rod, and a secondary valve seat is arranged at the junction of the first flow passage and the second flow passage; the sliding rod is provided with a long hole, the rotating shaft penetrates through the long hole, a transverse rack meshed with the circumferential rack is arranged on one side wall of the long hole, the other side wall of the long hole is a smooth surface, and the rotating shaft drives the sliding rod to move transversely when rotating.

In the aforesaid high pressure resistant double sealing gate valve, first runner all personally submits 11 degrees contained angles with the level with the third runner, the slide bar includes tip and horizontal segment, the tip of slide bar personally submits 11 degrees contained angles with the level.

In the high-pressure-resistant double-seal gate valve, the bottom of the valve body is provided with the mounting hole which is obliquely arranged, the mounting hole is communicated with the second flow channel, the mounting hole is in threaded connection with the sealing plug, and the threaded sealing ring is clamped between the sealing plug and the mounting hole.

In the aforesaid high pressure resistant double sealing gate valve, inferior disk seat is the polytetrafluoroethylene material, and the outside of inferior disk seat is equipped with the collar, be equipped with the annular mounting groove on the inner wall of valve body, the collar on the inferior disk seat imbed in the annular mounting groove and with annular mounting groove interference fit.

In the high-pressure-resistant double-seal gate valve, the inner wall of the valve body is provided with the annular shoulder for propping against the secondary valve seat.

In the high-pressure-resistant double-seal gate valve, the lower end of the thread on the side wall of the rotating shaft is provided with the limiting ring, and the limiting ring is fixed on the main valve flap through a screw.

In the high-pressure-resistant double-seal gate valve, the tail end of the long hole of the slide rod is clamped with the fixed column, and the side wall of the long hole is provided with the arc-shaped groove for positioning the fixed column; one end of the fixing column is arranged on the arc-shaped groove, and the other end of the fixing column is provided with a first fixing ring and extends into the sliding hole; the sliding hole is internally provided with a spring, the inner end face of the sliding hole is provided with a second fixing ring, one end of the spring is fixed on the first fixing ring, and the other end of the spring is fixed on the second fixing ring.

In the high-pressure resistant double-seal gate valve, the end face of the secondary valve clack, which is opposite to the liquid inlet, is provided with a plurality of concentrically arranged circular protrusions.

In the high-pressure-resistant double-seal gate valve, the bottom end of the valve rod is provided with a plurality of clamping rings with dovetail-shaped sections, the main valve disc is provided with a circular groove matched with the valve rod, and the side wall of the circular groove is further provided with an annular dovetail groove matched with the clamping rings.

Compared with the prior art, the valve body is internally provided with a first flow passage communicated with the liquid inlet, a second flow passage communicated with the liquid outlet and a third flow passage communicated with the first flow passage and the second flow passage, the first flow passage and the third flow passage are arranged in parallel, and a primary sealing mechanism is arranged in the second flow passage. When the gate valve needs to be closed, the hand wheel is rotated to drive the valve rod to rotate and descend, and the main valve clack at the bottom end of the valve rod is gradually in extrusion fit with the main valve seat to form a main sealing structure. Meanwhile, the valve rod drives the main valve flap to rotate, the main valve flap drives the rotating shaft arranged at the bottom end of the main valve flap to rotate, the circumferential rack on the rotating shaft is meshed with the transverse rack of the sliding rod arranged in the second flow passage, so that the sliding rod moves towards the direction of the secondary valve seat arranged at the junction of the first flow passage and the second flow passage along the sliding hole, until the main valve flap is completely matched with the main valve seat, the secondary valve flap at the front end of the sliding rod is completely matched with the secondary valve seat to form a secondary sealing structure, the main sealing structure and the secondary sealing structure form a double sealing structure, the high-pressure resistance of the gate valve can be greatly increased, the sealing performance of the gate valve is improved, the primary sealing mechanism is simple in structure, the processing is very convenient, the manufacturing cost is low.

According to the invention, the first flow channel and the third flow channel form an included angle of 11 degrees with the horizontal plane, so that the first flow channel and the second flow channel are coaxially arranged while the flow channel space is enlarged, and the butt joint with an external component is facilitated. The slide bar is also provided with an inclined section which forms an included angle of 11 degrees with the horizontal plane, so that the slide bar is adapted to the first flow channel, and the part damage caused by the collision of the side wall of the first flow channel is avoided.

The mounting hole is formed in the bottom of the valve body in an inclined mode, so that the sliding rod can be conveniently installed and taken out in the later period, the mounting hole is sealed through the sealing plug, and the sealing performance between the sealing plug and the mounting hole is enhanced through the threaded sealing ring.

The mounting ring on the secondary valve seat is fixed with the annular mounting groove on the inner wall of the valve body in an interference fit mode, and the secondary valve seat is very convenient to assemble and disassemble.

The inner wall of the valve body is provided with the annular shoulder for propping against the secondary valve seat, so that the fixing effect of the secondary valve seat is enhanced.

The side wall of the rotating shaft is provided with the limiting ring, after the top end of the rotating shaft is screwed into the main valve flap, the limiting ring is attached to the bottom end of the main valve flap and fixed on the main valve flap through screws, and therefore the fixing effect of the rotating shaft is enhanced.

According to the invention, the fixed column is clamped at the tail end of the long hole of the sliding rod, the spring is connected between the inner end surface of the sliding hole and the fixed column, tension is applied to the fixed column through the spring, and after the valve rod leaves the long hole of the sliding rod, the spring applies tension to the fixed column to pull back the sliding rod, so that the increase of resistance in the flow channel due to the fact that the sliding rod does not return is avoided.

The end face of the secondary valve clack, which is opposite to the liquid inlet, is provided with the plurality of circular protrusions, so that resistance can be generated on fluid on the front face, the scouring of the fluid on the surface of the secondary valve clack is reduced, and the service life of the secondary valve clack is prolonged.

The bottom end of the valve rod and the main valve clack are fixed in a mode that the plurality of snap rings are matched with the annular dovetail grooves, so that the valve is very convenient to disassemble and assemble and has a good fixing effect.

Drawings

FIG. 1 is a schematic structural view of the present invention as a whole;

FIG. 2 is a schematic structural view of the primary seal mechanism of the present invention;

FIG. 3 is an enlarged schematic view of portion A of FIG. 1;

FIG. 4 is an enlarged schematic view of the portion B of FIG. 1;

fig. 5 is an enlarged schematic view of the portion C of fig. 1.

The labels in the figures are: 1. a valve body; 2. a liquid inlet; 3. a liquid outlet; 4. a first flow passage; 5. a second flow passage; 6. a third flow path; 7. a valve stem; 8. a valve stem nut; 9. a yoke bushing; 10. a hand wheel; 11. a main valve flap; 12. a snap ring; 13. an annular dovetail groove; 14. a main valve seat; 15. a primary sealing mechanism; 16. mounting holes; 17. sealing the plug; 18. a threaded seal ring; 19. a rotating shaft; 20. a slide bar; 21. an angled end; 22. a horizontal segment; 23. a secondary valve flap; 24. the circular ring is convex; 25. a long hole; 26. a transverse rack; 27. a limiting ring; 28. a circumferential rack; 29. an arc-shaped slot; 30. fixing a column; 31. a first retaining ring; 32. a secondary valve seat; 33. a mounting ring; 34. an annular mounting groove; 35. an annular shoulder; 36. a second retaining ring; 37. a slide hole; 38. a spring; 39. a circular groove.

Detailed Description

The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.