A plug valve

Abstract

The present invention provides a plug valve, which relates to the field of plug valves. The plug valve includes a shell, wherein flanges are fixedly connected to both ends of the shell, a fixed cover is fixedly connected to the upper end of the shell, a top cover is fixedly connected to the upper end of the fixed cover, a driving mechanism is provided in the end of the top cover away from the fixed cover, a rotating lifting mechanism is provided in the fixed cover, a rotating valve core is rotatably connected to the bottom end of the shell, a valve seat is slidably connected to both sides of the rotating valve core, a sealing ring is fixedly connected to the valve seat, a fixed groove is provided on both sides of the shell near the sealing ring, an adaptive sealing strip is fixedly connected in the fixed groove, a plurality of springs are fixedly connected to the side of the adaptive sealing strip near the fixed groove, and a groove is provided on the side of the adaptive sealing strip near the spring. By using the rotating lifting mechanism and the adaptive sealing strip, even if the valve core and the valve seat are worn due to long-term friction, the sealing performance is still maintained.

Description

Technical Field

[0001] The present invention relates to the technical field of plug valves, in particular to a plug valve. Background Art

[0002] A plug valve is a rotary valve with a closing member or plunger shape. It is a valve that is opened or closed by rotating 90 degrees so that the channel opening on the valve plug is the same as or perpendicular to the channel opening on the valve body. The shape of the valve plug of the plug valve can be cylindrical or conical. In a cylindrical valve plug, the channel is generally rectangular, while in a conical valve plug, the channel is trapezoidal. In a plug valve, the valve core often rubs against the valve seat when opening and closing, causing wear on the valve seat. When the valve core rotates downward, it cannot squeeze the valve seat to fit tightly against the pipes at both ends of the valve body, reducing the sealing effect of the valve seat on the pipe. Summary of the Invention

[0003] In view of the deficiencies in the prior art, the present invention provides a plug valve that solves the problem of reduced sealing performance due to wear of the valve core and valve seat inside the plug valve.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a plug valve, comprising a shell, both ends of the shell are fixedly connected with flanges, the upper end of the shell is fixedly connected with a fixed cover, the upper end of the fixed cover is fixedly connected with a top cover, a driving mechanism is provided in the end of the top cover away from the fixed cover, a rotating lifting mechanism is provided in the fixed cover, the bottom end of the shell is rotatably connected with a rotating valve core, both sides of the rotating valve core are slidably connected with a valve seat, a sealing ring is fixedly connected to the valve seat, fixed grooves are provided on both sides of the shell near the sealing ring, an adaptive sealing strip is fixedly connected in the fixed groove, a plurality of springs are fixedly connected to the side of the adaptive sealing strip near the fixed groove, a groove is provided on the side of the adaptive sealing strip near the spring, a plurality of micropores are provided on the side of the adaptive sealing strip away from the spring, and the micropores are connected to the grooves.

[0005] Through the above technical solution, even if the valve core and the valve seat are used for a long time and wear occurs due to friction, the sealing performance can still be maintained by the adaptive sealing strip, thereby greatly improving the service life of the valve body.

[0006] Preferably, the driving mechanism includes a driving shaft, a driving shaft is rotatably connected to the end of the top cover away from the fixed cover, one end of the driving shaft is fixedly connected to a rotating wheel, the end of the driving shaft away from the rotating wheel is fixedly connected to a worm, the side of the rotating wheel away from the driving shaft is fixedly connected to a hand crank, a protective glove is provided on the outer rotating sleeve of the hand crank, the upper end of the rotating lifting mechanism is fixedly connected to a worm wheel, the worm wheel and the worm are engaged with each other, the protective glove is made of plastic, and a plurality of anti-slip grooves are fixedly connected to the protective glove.

[0007] With the above technical solution, the valve can be driven to open or close by shaking the crank handle, and the force required to open the valve can be reduced by setting the wheel and the worm gear.

[0008] Preferably, the rotary lifting mechanism includes a rotating shaft, the top end of the rotating shaft is fixedly connected to a worm gear, the end of the rotating shaft close to the worm gear is fixedly connected to a fixing ring, the lower end of the fixing ring is fixedly connected to a limiting block, the end of the rotating shaft away from the worm gear is covered with a sleeve, the end of the rotating shaft close to the sleeve is fixedly connected to a screw, and one side of the top cover is fixedly connected to a limiting rod.

[0009] Through the above technical solution, the driving mechanism can control the opening and closing of the valve core by driving the rotary lifting mechanism.

[0010] Preferably, a thread is provided in the sleeve, the screw rod and the thread are engaged with each other, the end of the screw rod away from the rotating shaft is fixedly connected to a connecting rod, a limiting groove is provided on one side surface of the sleeve, the limiting rod and the limiting groove are slidably engaged with each other, and the limiting groove is L-shaped.

[0011] Preferably, the upper end of the sleeve is fixedly connected to a fixed block, the lower end of the fixed block is passed through and fixedly connected to a fixed pin, the fixed pin passes through and is fixedly connected to a transmission shaft, the upper end of the transmission shaft passes through a sliding connection rod, and the end of the transmission shaft away from the sleeve is fixedly connected to a rotating valve core.

[0012] Through the above technical solution, with the cooperation of the sleeve, screw rod, limit rod and limit block, the valve core can be rotated first when closing, so that the through hole and the pipeline are at 90 degrees, and then moved downward. The valve seat is squeezed to both sides through the tapered lower end, so that the sealing ring on the valve seat squeezes the two ends of the valve body to seal and improve the sealing effect. When opening, the valve core can be lifted first to reduce the friction of the valve core rotation, making it more convenient to open the valve.

[0013] Preferably, the bottom end of the rotating valve core is conical, and sliders are fixedly connected to both sides of the rotating valve core. A sliding groove is provided on the inner side of the valve seat, and the sliding groove and the slider slide with each other. A sealing ring is fixedly connected to the side of the valve seat away from the rotating valve core, and a through hole is provided in the rotating valve core. The sealing ring is made of rubber, the through hole is trapezoidal, and the corners of the through hole are rounded.

[0014] Through the above technical solution, the rotating valve core can drive the valve seat to rotate, and by making the rotating valve core and the valve seat slide relative to each other, the valve seat is squeezed to move toward both ends, so that the sealing ring on the valve seat is sealed.

[0015] Preferably, a sealing plate is provided on the outer sleeve of the end of the transmission shaft close to the sleeve, a second sealing ring is fixedly connected to the side of the sealing plate close to the transmission shaft, and a first sealing ring is fixedly connected to the side of the sealing plate close to the fixed cover, the second sealing ring and the first sealing ring are both made of rubber, and the upper surface of the sealing plate is threaded with a plurality of fixing bolts, the fixing bolts are rotatably connected to the fixed cover, and the sealing plate is made of stainless steel.

[0016] Through the above technical solution, the transmission shaft position on the valve can be sealed to prevent internal liquid from leaking through the transmission shaft.

[0017] Preferably, the rotating valve core is made of stainless steel, the rotating valve core and the transmission shaft are integrated, a plurality of circular holes are opened on the flange, the outer shell is made of stainless steel, and the top cover and the fixed cover are integrated.

[0018] Through the above technical solution, the valve can be made stronger and the risk of leakage can be reduced.

[0019] Working principle: When opening the valve, the hand crank 64 is used to rotate the wheel 63, so that the wheel 63 rotates with the multi-function worm 62 through the drive shaft 61, and the worm 62 cooperates with the worm wheel 66 to drive the rotating shaft 71 to rotate, and the rotating shaft 71 drives the screw rod 74 to rotate. Under the cooperation of the screw rod 74 and the sleeve 75, the sleeve 75 moves up, and the sleeve 75 drives the transmission shaft 8 to move up through the fixing pin 9, and the transmission shaft 8 drives the rotating valve core 14 to move up. When the limit rod 78 moves to the bottom of the slide groove 77 and the fixing block 76 clamps the limit block 73, the rotation of the rotating shaft 71 drives the sleeve 75 to rotate, thereby driving the rotating valve core 14 to rotate, and the rotating valve core 14 drives the valve seat 17 to rotate through the slider 16, aligning the through hole 15 with the openings at both ends of the valve body to open the valve. When the valve is to be closed, the reverse direction is used. Rotate the wheel 63 to rotate the rotating valve core 14 in the opposite direction to drive the valve seat 17 back to its original position, making the through hole 15 and the pipeline at a 90° angle. After that, since the limit rod 78 reaches the rightmost side of the slide groove, the sleeve 75 cannot continue to rotate. Therefore, the rotation of the rotating shaft 71 causes the screw rod 74 to cooperate with the sleeve 75 to push the sleeve 75 downward, thereby causing the rotating valve core 14 to move downward. By rotating the conical bottom of the valve core 14, the valve seat 17 is pushed to both sides. At this time, the adaptive sealing strip 20 in the fixed groove 24 moves outward under the action of the spring 23, and the liquid in the pipeline enters the groove 22 through the micropore 21, so that the liquid pressure on both sides of the adaptive sealing strip 20 is the same, so that the adaptive sealing strip 20 is only subjected to the thrust of the spring 23, thereby squeezing each other with the sealing ring 18 to improve the sealing effect.

[0020] The present invention provides a plug valve having the following beneficial effects:

[0021] The present invention improves the sealing performance of the valve body by installing an adaptive sealing strip in the housing and pushing the adaptive sealing strip and the sealing ring to be squeezed by a spring. By providing micropores and grooves on the adaptive sealing strip, the liquid in the pipeline can enter the fixed groove, so that the liquid pressure at both ends of the adaptive sealing strip is equal, and the adaptive sealing strip is prevented from moving into the fixed groove due to excessive liquid pressure, thereby increasing the gap between the adaptive sealing strip and the sealing ring and affecting the sealing effect. Regardless of the position of the valve seat due to wear, the adaptive sealing strip can always be in close contact with the sealing ring, so that the sealing effect will not be reduced.

[0022] The present invention uses a rotary lifting mechanism to make the valve core rotate and rise when opening. Due to the conical setting of the lower end of the valve core, the pressure on the valve seat is relaxed, making the valve easier to open. When closing, it rotates and descends, squeezing the valve seats on both sides, causing the valve seats to move to both sides and making the sealing rings on the valve seats close to the inlets and outlets at both ends of the valve body, forming a sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a cross-sectional view of the top cover of the present invention;

[0025] Figure 3 This is a structural diagram of the valve core of the present invention;

[0026] Figure 4 This is a cross-sectional view of the interior of the sleeve of the present invention;

[0027] Figure 5 A three-dimensional diagram of the adaptive sealing structure of the present invention;

[0028] Figure 6 This is a cross-sectional view of the adaptive sealing structure of the present invention.

[0029] Among them, 1. outer shell; 2. flange; 3. round hole; 4. fixed cover; 5. top cover; 6. driving mechanism; 61. driving shaft; 62. worm; 63. rotating wheel; 64. hand crank; 65. protective cover; 66. worm gear; 7. rotating lifting mechanism; 71. rotating shaft; 72. fixing ring; 73. limit block; 74. screw rod; 75. sleeve; 76. fixing block; 77. limit groove; 78. limit rod; 79. connecting rod; 8. transmission shaft; 9. fixing pin; 10. sealing plate; 11. fixing bolt; 12. first sealing ring; 13. second sealing ring; 14. rotating valve core; 15. through hole; 16. slider; 17. valve seat; 18. sealing ring; 19. slide groove; 20. adaptive sealing strip; 21. micropore; 22. groove; 23. spring; 24. fixing groove. Implementation Method

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments 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. Example

[0031] like Figure 1 、 Figure 5 and Figure 6 The embodiment of the present invention provides a plug valve, comprising a housing 1, flanges 2 fixedly connected to both ends of the housing 1, a fixed cover 4 fixedly connected to the upper end of the housing 1, a top cover 5 fixedly connected to the upper end of the fixed cover 4, a driving mechanism 6 provided in the end of the top cover 5 away from the fixed cover 4, a rotating lifting mechanism 7 provided in the fixed cover 4, a rotating valve core 14 rotatably connected to the bottom end of the housing 1, a valve seat 17 slidably connected to both sides of the rotating valve core 14, a sealing ring 18 fixedly connected to the valve seat 17, and a fixing groove 24 provided on both sides of the housing 1 near the sealing ring 18. An adaptive sealing strip 20 is fixedly connected in the fixed groove 24, and a number of springs 23 are fixedly connected to the side of the adaptive sealing strip 20 close to the fixed groove 24. A groove 22 is provided on the side of the adaptive sealing strip 20 close to the spring 23, and a number of micropores 21 are provided on the side of the adaptive sealing strip 20 away from the spring 23. The micropores 21 are connected to the grooves 22. The rotating valve core 14 is made of stainless steel, and the rotating valve core 14 and the drive shaft 8 are integrated. A number of circular holes 3 are provided on the flange 2, and the outer shell 1 is made of stainless steel. The top cover 5 and the fixed cover 4 are integrated.

[0032] like Figure 2 、 Figure 3 and Figure 4As shown, the upper end of the sleeve 75 is fixedly connected to a fixed block 76, the lower end of the fixed block 76 is fixedly connected to a fixed pin 9, the fixed pin 9 is fixedly connected to the transmission shaft 8, the upper end of the transmission shaft 8 is connected to the sliding connection rod 79, the end of the transmission shaft 8 away from the sleeve 75 is fixedly connected to the rotating valve core 14, the bottom end of the rotating valve core 14 is tapered, both sides of the rotating valve core 14 are fixedly connected to the slider 16, the inner side of the valve seat 17 is provided with a slide groove 19, the slide groove 19 and the slider 16 slide with each other, the valve seat 17 is fixedly connected to the side away from the rotating valve core 14 with a sealing ring 18, the rotating valve A through hole 15 is provided in the core 14, and a sealing ring 18 is made of rubber. The through hole 15 is trapezoidal, and the corners of the through hole 15 are rounded. A sealing plate 10 is provided on the outer sleeve of the end of the transmission shaft 8 close to the sleeve 75. The side of the sealing plate 10 close to the transmission shaft 8 is fixedly connected to the second sealing ring 13, and the side of the sealing plate 10 close to the fixed cover 4 is fixedly connected to the first sealing ring 12. The second sealing ring 13 and the first sealing ring 12 are both made of rubber. The upper surface of the sealing plate 10 is threaded with a plurality of fixing bolts 11, which penetrate and rotate to connect the fixed cover 4. The sealing plate 10 is made of stainless steel.

[0033] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A plug valve comprising a housing (1), characterized in that: The two ends of the shell (1) are fixedly connected with flanges (2), the upper end of the shell (1) is fixedly connected with a fixed cover (4), the upper end of the fixed cover (4) is fixedly connected with a top cover (5), a driving mechanism (6) is provided in the end of the top cover (5) away from the fixed cover (4), a rotating lifting mechanism (7) is provided in the fixed cover (4), the bottom end of the shell (1) is rotatably connected with a rotating valve core (14), both sides of the rotating valve core (14) are slidably connected with a valve seat (17), a sealing ring (18) is fixedly connected to the valve seat (17), and a fixing groove (24) is provided on both sides of the shell (1) near the sealing ring (18), an adaptive sealing strip (20) is fixedly connected in the fixing groove (24), and a plurality of springs are fixedly connected to the side of the adaptive sealing strip (20) near the fixing groove (24). (23), a groove (22) is provided on the side of the adaptive sealing strip (20) close to the spring (23), and a plurality of micropores (21) are provided on the side of the adaptive sealing strip (20) away from the spring (23), and the micropores (21) are communicated with the grooves (22). The bottom end of the rotating valve core (14) is conical, and both sides of the rotating valve core (14) are fixedly connected with sliders (16), and the inner side of the valve seat (17) is provided with a slide groove (19), and the slide groove (19) and the slider (16) slide with each other. The side of the valve seat (17) away from the rotating valve core (14) is fixedly connected with a sealing ring (18), and a through hole (15) is provided in the rotating valve core (14), and the sealing ring (18) is made of rubber. The through hole (15) is trapezoidal, and the corners of the through hole (15) are rounded.

2. A plug valve according to claim 1, characterized in that: The driving mechanism (6) comprises a driving shaft (61), an end of the top cover (5) away from the fixed cover (4) is rotatably connected to the driving shaft (61), one end of the driving shaft (61) is fixedly connected to a rotating wheel (63), one end of the driving shaft (61) away from the rotating wheel (63) is fixedly connected to a worm (62), a side of the rotating wheel (63) away from the driving shaft (61) is fixedly connected to a hand crank (64), a protective glove (65) is provided on the outer rotating sleeve of the hand crank (64), the upper end of the rotating lifting mechanism (7) is fixedly connected to a worm wheel (66), the worm wheel (66) and the worm (62) are meshed with each other, the protective glove (65) is made of plastic, and a plurality of anti-slip grooves are fixedly connected to the protective glove (65).

3. A plug valve according to claim 1, characterized in that: The rotary lifting mechanism (7) comprises a rotating shaft (71), the top end of the rotating shaft (71) is fixedly connected to a worm gear (66), the end of the rotating shaft (71) close to the worm gear (66) is fixedly connected to a fixing ring (72), the lower end of the fixing ring (72) is fixedly connected to a limiting block (73), the end of the rotating shaft (71) away from the worm gear (66) is provided with a sleeve (75) on the outer sleeve, the end of the rotating shaft (71) close to the sleeve (75) is fixedly connected to a screw rod (74), and one side of the top cover (5) is passed through and fixedly connected to a limiting rod (78).

4. A plug valve according to claim 3, characterized in that: The sleeve (75) is provided with a thread, the screw rod (74) and the thread are meshed with each other, one end of the screw rod (74) away from the rotating shaft (71) is fixedly connected to a connecting rod (79), a limiting groove (77) is provided on one side surface of the sleeve (75), the limiting rod (78) and the limiting groove (77) are slidably matched with each other, and the limiting groove (77) is L-shaped.

5. The plug valve according to claim 3, characterized in that: The upper end of the sleeve (75) is fixedly connected to a fixed block (76), the lower end of the fixed block (76) is penetrated and fixedly connected to a fixed pin (9), the fixed pin (9) is penetrated and fixedly connected to a transmission shaft (8), the upper end of the transmission shaft (8) is penetrated and fixedly connected to a sliding connection rod (79), and the end of the transmission shaft (8) away from the sleeve (75) is fixedly connected to a rotating valve core (14).

6. A plug valve according to claim 5, characterized in that: A sealing plate (10) is provided on the outer sleeve of one end of the transmission shaft (8) close to the sleeve (75); a second sealing ring (13) is fixedly connected to the side of the sealing plate (10) close to the transmission shaft (8); a first sealing ring (12) is fixedly connected to the side of the sealing plate (10) close to the fixed cover (4); the second sealing ring (13) and the first sealing ring (12) are both made of rubber; a plurality of fixing bolts (11) are threadedly connected to the upper surface of the sealing plate (10); the fixing bolts (11) are threadedly connected to the fixed cover (4); and the sealing plate (10) is made of stainless steel.

7. The plug valve according to claim 1, characterized in that: The rotating valve core (14) is made of stainless steel, and the rotating valve core (14) and the transmission shaft (8) are integrated. The flange (2) is provided with a plurality of circular holes (3). The housing (1) is made of stainless steel, and the top cover (5) and the fixed cover (4) are integrated.

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