Self-lubricating plug valve

Abstract

The utility model discloses a self-lubricating plug valve. The plug valve comprises a shell; a flow channel is arranged in the shell; a ball valve is arranged in the flow channel; an upper valve seat and a lower valve seat are arranged on the upper side and the lower side of the ball valve respectively. Knobs corresponding to the ball valves are symmetrically arranged on the left side and the right side of the shell; the knob is connected with the ball valve; an oil storage cavity is formed between the outer side wall of the lower valve seat and the inner side wall of the flow channel. A connecting channel is arranged in the lower valve seat; one end of the connecting channel is communicated with the oil storage cavity, and the other end of the connecting channel is communicated to the ball valve. By arranging the oil storage cavity and communicating the ball valve with the oil storage cavity through the connecting channel, during use, oil in the oil storage cavity can flow out of the oil storage cavity through the connecting channel and is in contact with the outer surface of the ball valve, so that self-lubrication of the ball valve can be realized, and the service life can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and more particularly to a self-lubricating plug valve. Background Art

[0002] Existing plug valves used in drilling and workover operations in the oil and gas industry are typically connected to the top of the drilling and workover tubing. Rotation of a knob in the bypass hole of the plug valve drives the ball valve, opening and closing the plug valve's flow path. However, this type of plug valve has the following problems: first, the internal rotating parts lack oil storage and sealing structures; second, the medium in the pipe easily enters the outer chamber of the ball valve; and third, the medium that enters the outer chamber of the ball valve is prone to sedimentation and drying. Utility Model Content

[0003] In view of this, the utility model provides a self-lubricating plug valve, the purpose of which is to solve the problems existing in the prior art.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A self-lubricating plug valve comprises: a shell; a flow channel is provided inside the shell; a ball valve is provided inside the flow channel; an upper valve seat and a lower valve seat are provided on the upper and lower sides of the ball valve respectively; knobs corresponding to the ball valve are symmetrically provided on the left and right sides of the shell; the knob is connected to the ball valve; an oil storage chamber is provided between the outer side wall of the lower valve seat and the inner side wall of the flow channel; a connecting channel is provided inside the lower valve seat; one end of the connecting channel is connected to the oil storage chamber, and the other end of the connecting channel is connected to the ball valve.

[0006] Preferably, an upper valve seat sealing ring is sleeved on the outer side wall of the upper valve seat; a lower valve seat sealing ring is sleeved on the outer side wall of the lower valve seat; and the lower valve seat sealing ring is located below the oil storage cavity.

[0007] Preferably, an upper valve seat packing is provided between the upper valve seat and the ball valve; and a lower valve seat packing is provided between the lower valve seat and the ball valve.

[0008] Preferably, an upper limit ring is provided inside the flow channel; the top of the upper valve seat abuts against the bottom of the upper limit ring; a lower limit ring is provided between the outer wall of the upper valve seat and the inner wall of the flow channel; a wave spring is provided at the bottom end of the lower valve seat; the bottom end of the wave spring abuts against the inner wall of the flow channel.

[0009] Preferably, a fixing ring is sleeved inside the upper limit ring.

[0010] Preferably, the knob is connected to the ball valve via a dial block.

[0011] Preferably, shell bypass holes are symmetrically provided on the left and right sides of the shell; the knob is arranged in the corresponding shell bypass hole; a knob jacket is provided on the outside of the knob; a knob jacket sealing ring is provided on the outer wall of the knob; a knob sealing ring is provided on the outer wall of the knob.

[0012] Preferably, a knob protective cover is provided on the outer side of the knob; the knob protective cover is arranged on a side of the knob outer sleeve close to the ball valve.

[0013] Preferably, an upper end connecting internal thread is provided on the inner side wall of the upper end of the flow channel; and a lower end connecting external thread is provided on the outer side wall of the lower end of the shell.

[0014] Compared with the prior art, the utility model has achieved the following technical effects:

[0015] 1) The utility model provides an oil storage chamber and connects the ball valve and the oil storage chamber through a connecting channel. When in use, the oil in the oil storage chamber can flow out of the oil storage chamber through the connecting channel and contact the outer surface of the ball valve, thereby achieving self-lubrication of the ball valve and thus extending its service life.

[0016] 2) The utility model forms a complete sealing structure through the upper valve seat seal, the lower valve seat seal, the seal between the ball valve and the upper valve seat and the lower valve seat, the knob jacket seal, and the knob seal, which can ensure the overall sealing of the plug valve, thereby further extending the service life;

[0017] 3) The utility model has a reasonable structural arrangement, self-sealing and lubrication, and a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of a self-lubricating plug valve of the utility model;

[0019] In the figure: 1. Shell; 2. Flow channel; 3. Ball valve; 4. Upper valve seat; 5. Lower valve seat; 6. Knob; 7. Oil storage chamber; 8. Upper valve seat sealing ring; 9. Lower valve seat sealing ring; 10. Upper valve seat packing; 11. Lower valve seat packing; 12. Upper limit ring; 13. Lower limit ring; 14. Wave spring; 15. Fixed ring; 16. Shift block; 17. Knob jacket; 18. Knob jacket sealing ring; 19. Knob sealing ring; 20. Knob protective cover; 21. Upper end connecting internal thread; 22. Lower end connecting external thread. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Example

[0022] Reference Figure 1 As shown, the utility model discloses a self-lubricating plug valve, comprising: a housing 1; a flow channel 2 is provided inside the housing 1; a ball valve 3 is provided inside the flow channel 2; an upper valve seat 4 and a lower valve seat 5 are respectively provided on the upper and lower sides of the ball valve 3; knobs 6 corresponding to the ball valve 3 are symmetrically provided on the left and right sides of the housing 1; the knob 6 is connected to the ball valve 3; an oil storage chamber 7 is provided between the outer wall of the lower valve seat 5 and the inner wall of the flow channel 2; a connecting channel is provided inside the lower valve seat 5; one end of the connecting channel is connected to the oil storage chamber 7, and the other end of the connecting channel is connected to the ball valve 3; when in use, the ball valve 3 is rotated by rotating the knob 6, and the rotation of the ball valve 3 realizes the opening and closing of the flow channel 2 inside the self-lubricating plug valve; when the ball valve 3 is closed, it is subjected to the fluid pressure in the flow channel 2, and when the ball valve 3 is opened, the fluid circulates; at the same time, the oil in the oil storage chamber 7 flows to the ball valve 3 through the connecting channel, and through the rotation of the ball valve 3, the outer surface of the ball valve 3 is lubricated, thereby extending the service life of the self-lubricating plug valve.

[0023] In this embodiment, an upper valve seat sealing ring 8 is provided on the outer wall of the upper valve seat 4; a lower valve seat sealing ring 9 is provided on the outer wall of the lower valve seat 5; the lower valve seat sealing ring 9 is located below the oil storage chamber 7; by providing the upper valve seat sealing ring 8, the sealing between the upper valve seat 4 and the flow channel 2 is achieved, and by providing the lower valve seat sealing ring 9, the sealing between the lower valve seat 5 and the flow channel 2 is achieved.

[0024] In this embodiment, an upper valve seat packing 10 is provided between the upper valve seat 4 and the ball valve 3; a lower valve seat packing 11 is provided between the lower valve seat 5 and the ball valve 3; the upper valve seat packing 10 and the lower valve seat packing 11 prevent the medium in the flow channel 2 from entering the outer cavity of the ball valve 3.

[0025] In this embodiment, an upper limit ring 12 is sleeved inside the flow channel 2; a fixing ring 15 is sleeved inside the upper limit ring 12; the top of the upper valve seat 4 abuts against the bottom of the upper limit ring 12; a lower limit ring 13 is provided between the outer wall of the upper valve seat 4 and the inner wall of the flow channel 2; a wave spring 14 is provided at the bottom end of the lower valve seat 5; the bottom end of the wave spring 14 abuts against the inner wall of the flow channel 2; the wave spring 14 generates a thrust on the lower valve seat 5, thereby realizing the sealing between the ball valve 3 and the upper valve seat 4 and the lower valve seat 5.

[0026] In this embodiment, the upper limit ring 12 and the lower limit ring 13 are embedded in annular grooves reserved on the inner wall of the flow channel 2 .

[0027] In this embodiment, the upper valve seat sealing ring 8 is arranged between the upper limit ring 12 and the lower limit ring 13 .

[0028] In this embodiment, the knob 6 is connected to the ball valve 3 via the dial block 16 .

[0029] In this embodiment, shell bypass holes are symmetrically provided on the left and right sides of the shell 1; the knob 6 is arranged in the corresponding shell bypass hole; a knob sleeve 17 is provided on the outside of the knob 6; a knob sleeve sealing ring 18 is provided on the outer wall of the knob sleeve 17, and the knob sleeve sealing ring 18 is used to achieve sealing between the knob sleeve 17 and the shell bypass hole; a knob sealing ring 19 is provided on the outer wall of the knob 6, and the sealing between the knob 6 and the knob sleeve 17 is achieved by setting the knob sealing ring 19.

[0030] In this embodiment, a knob protective cover 20 is provided on the outside of the knob 6; the knob protective cover 20 is arranged on the side of the knob outer sleeve 17 close to the ball valve 3; the knob protective cover 20 can prevent the medium in the flow channel 2 from entering the internal gap between the knob 6 and the shift block 16.

[0031] In this embodiment, an upper end connecting internal thread 21 is provided on the inner side wall of the upper end of the flow channel 2 ; and a lower end connecting external thread 22 is provided on the outer side wall of the lower end of the shell 1 .

[0032] In this embodiment, an annular oil storage groove is provided on the outer side wall of the lower valve seat 5 ; the annular oil storage groove and the inner side wall of the flow channel 2 together form an oil storage cavity 7 .

[0033] The upper valve seat seal, lower valve seat seal, seals between the ball valve and the upper valve seat and lower valve seat, knob sleeve seal, and knob seal in the utility model constitute a complete sealing structure, which can ensure the overall sealing of the plug valve; by providing an oil storage chamber, the oil in the oil storage chamber flows out through the connecting channel and contacts the ball valve, thereby achieving lubrication of the ball valve; the upper valve seat packing and the lower valve seat packing can prevent the medium in the flow channel from entering the outer cavity of the ball valve; the knob protective cover can prevent the medium in the flow channel from entering the internal gap between the knob and the dial block; the overall structure is reasonably arranged, has self-sealing and lubrication, and can extend the service life.

[0034] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A self-lubricating plug valve, characterized in that: include: A housing (1); a flow channel (2) is provided inside the housing (1); a ball valve (3) is provided inside the flow channel (2); an upper valve seat (4) and a lower valve seat (5) are provided on the upper and lower sides of the ball valve (3), respectively; knobs (6) corresponding to the ball valve (3) are symmetrically provided on the left and right sides of the housing (1); the knobs (6) are connected to the ball valve (3); an oil storage chamber (7) is provided between the outer wall of the lower valve seat (5) and the inner wall of the flow channel (2); a connecting channel is provided inside the lower valve seat (5); one end of the connecting channel is connected to the oil storage chamber (7), and the other end of the connecting channel is connected to the ball valve (3).

2. A self-lubricating plug valve according to claim 1, characterized in that: An upper valve seat sealing ring (8) is sleeved on the outer wall of the upper valve seat (4); a lower valve seat sealing ring (9) is sleeved on the outer wall of the lower valve seat (5); and the lower valve seat sealing ring (9) is located below the oil storage cavity (7).

3. The self-lubricating plug valve according to claim 1, characterized in that: An upper valve seat packing (10) is provided between the upper valve seat (4) and the ball valve (3); and a lower valve seat packing (11) is provided between the lower valve seat (5) and the ball valve (3).

4. The self-lubricating plug valve according to claim 1, characterized in that: An upper limit ring (12) is sleeved inside the flow channel (2); the top of the upper valve seat (4) abuts against the bottom of the upper limit ring (12); a lower limit ring (13) is provided between the outer wall of the upper valve seat (4) and the inner wall of the flow channel (2); a wave spring (14) is provided at the bottom end of the lower valve seat (5); the bottom end of the wave spring (14) abuts against the inner wall of the flow channel (2).

5. A self-lubricating plug valve according to claim 4, characterized in that: A fixing ring (15) is sleeved inside the upper limit ring (12).

6. The self-lubricating plug valve according to claim 1, characterized in that: The knob (6) is connected to the ball valve (3) via a dial block (16).

7. The self-lubricating plug valve according to claim 1, characterized in that: The housing (1) is symmetrically provided with housing bypass holes on both sides; the knob (6) is arranged in the corresponding housing bypass hole; the outer side of the knob (6) is provided with a knob cover (17); the outer side wall of the knob cover (17) is provided with a knob cover sealing ring (18); the outer side wall of the knob (6) is provided with a knob sealing ring (19).

8. The self-lubricating plug valve according to claim 7, characterized in that: The outer side of the knob (6) is provided with a knob protective cover (20); the knob protective cover (20) is arranged on a side of the knob outer cover (17) close to the ball valve (3).

9. The self-lubricating plug valve according to claim 1, characterized in that: An upper end connecting internal thread (21) is provided on the inner side wall of the upper end of the flow channel (2); and a lower end connecting external thread (22) is provided on the outer side wall of the lower end of the shell (1).

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