Expanding type ball valve of pneumatic double-rail actuating mechanism

Abstract

The invention discloses a pneumatic double-track actuating mechanism opening type ball valve which is provided with a pneumatic double-track actuating mechanism, has a vertical push-pull stroke and a horizontal 90-degree rotating output function, and is externally provided with a horizontal air cylinder. A connecting arm, a guide shaft provided with a straight chute, a movable connector, a movable pin shaft, a gear rack structure, a limiting block and the like are arranged in the valve internal part valve rod body, continuity of a straight stroke and an angular stroke, accurate distance control of the straight stroke and accurate positioning of a rotating angle are achieved, and a straight gear with a flat key is arranged above the valve internal part valve rod body. The second driving piece drives the valve rod body to rotate by 90 degrees when the rack horizontally moves, the lower end of the valve rod body is provided with an oblique angle T-shaped groove which is symmetrical to the center line, the oblique angle T-shaped groove is connected with corresponding traction blocks at the upper ends of the two spherical valve clack bodies, and when the valve is opened and closed, the spherical valve clack bodies rotate, and the sealing pieces are disengaged and closed.

Description

Technical Field

[0001] The invention relates to the field of ball valves, in particular to a pneumatic double-track actuator expansion-type ball valve. Background Art

[0002] There is no pneumatic double-track actuator expansion ball valve on the current market. The existing pneumatic actuators only have single-track, or pneumatic straight-stroke or pneumatic angular-stroke actuators. When opening and closing the existing swing-type ball valve (i.e., track ball valve), the valve core needs to complete two actions, one is to retract or expand, and the other is to rotate 90°. The present invention provides a pneumatic double-track actuator, which has the following functions: it has both vertical push-pull straight stroke and horizontal 90° rotation output function. When the pneumatic double-track expansion ball valve is opened and closed, the spherical valve disc only needs to be designed with an expansion or retraction structure. The pneumatic double-track expansion ball valve is a new structure opening and closing zero-friction bidirectional sealing swing ball valve, which simplifies the valve structure, reduces the valve manufacturing cost, and improves the valve service life. Summary of the invention

[0003] The object of the present invention is to provide a pneumatic double-track actuator expansion ball valve to solve the problems raised in the above-mentioned background technology, which has the advantages of simplifying the valve structure, reducing the valve manufacturing cost and increasing the service life of the valve.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a pneumatic double-track actuator expansion ball valve, comprising a pneumatic double-track actuator, an expansion ball valve, the output component of the power of the pneumatic double-track actuator, namely a movable connecting head and a spur gear in the pneumatic double-track actuator, the movable connecting head and the spur gear are connected to the valve stem body of the expansion ball valve, the lower end valve stem head of the valve stem body of the expansion ball valve is provided with an inclined T-shaped groove, the lower end valve stem head of the valve stem body is provided with a T-shaped inclined groove connected to a traction block arranged at the upper end of a spherical valve disc body, the lower end of the spherical valve disc body is designed with a pin shaft hole, a positioning pin shaft is provided in the pin shaft hole at the lower end of the spherical valve disc body and is connected to the positioning movable block, and the lower end of the positioning movable block is connected to an anti-upward displacement screw disk.

[0005] Preferably, the pneumatic dual-track actuator includes a first driving member and a second driving member, one end of the first driving member and the second driving member is provided with a power member for driving the first driving member and the second driving member to move, the power member is configured as a cylinder, the piston rod of the cylinder is the power output end, one end of the piston rod is sleeved with a piston, the left and right cylinder heads of the cylinder are respectively provided with a first inlet and exhaust port and a second inlet and exhaust port, one end of the piston rod is connected to a connecting arm, and both ends of the connecting arm are respectively fixedly connected to the guide shaft and the rack.

[0006] Preferably, the spur gear is connected to an anti-rotation block, and the inner holes of the spur gear and the anti-rotation block are both designed with keyways, which are movably fitted into a valve stem body with a flat key, and a straight oblique groove passing through the guide shaft is provided in the guide shaft, and a movable pin is provided on the guide shaft through the straight oblique groove, and the movable pin is connected to a movable connecting head, and the movable connecting head is connected to one end of the valve stem body.

[0007] Preferably, a second limiting screw is provided on the end cover on one side of the cylinder, and the second limiting screw limits the piston rod.

[0008] Preferably, a first lug with a hole is provided at the upper end of the spherical valve flap body, a traction block with a T-shaped head is provided on the first lug with a hole, and a second lug with a hole is provided at the lower end of the spherical valve flap body.

[0009] Preferably, the second perforated lug at the lower end of the spherical valve flap body is connected to the positioning movable block via a positioning pin, and the positioning movable block is provided with a positioning pin, one end of which is sleeved on the outside of the positioning pin.

[0010] Preferably, an anti-upward movement screw disk is provided at the lower end of the positioning movable block.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. No wear when opening and closing: When opening and closing the valve, the inclined T-shaped groove on the valve stem head is used to cooperate with the swinging T-shaped traction heads on the upper ends of the two spherical valve disc bodies. The valve stem moves up and down, and the traction block with the T-shaped head on the upper end of the spherical valve disc body shrinks and expands along the T-shaped groove on the inclined surface of the valve stem head body, so that the sealing surface on the spherical valve disc body is separated and combined with the sealing surface of the valve seat. First, because the T-shaped groove on the inclined surface of the valve stem head has a small angle, the force component of shrinking the spherical valve disc body is small. Second, the lower end of the spherical valve disc body is a swing support point. The upper end is the force arm, which is lengthened. Based on the lever principle, the force driving the valve disc sealing surface to leave the valve seat sealing surface is reduced by more than 50%. The inclined T-shaped groove cooperates with the swinging T-shaped traction head at the upper end of the two spherical valve disc bodies. The contact area is relatively large, the strength is good, and the service life is increased. When opening the valve, the spherical valve disc sealing surface is separated from the valve seat sealing surface and then rotated. There is no friction on the sealing surface. When it is turned to 90°, the valve is fully opened. When closing the valve, first rotate the spherical valve disc body 90°, and then combine the valve disc sealing surface with the valve seat sealing surface, and the valve is fully closed.

[0013] 2. Reduce costs: Due to the configuration of pneumatic double-track actuator, the valve structure is simplified, reducing the valve manufacturing cost;

[0014] 3. Self-cleaning function: The spherical valve disc body is flushed by the medium during the opening process to achieve self-cleaning, and no impurities or dirt will remain on the sealing surface to affect the valve sealing performance;

[0015] 4. Long service life: There is no contact between the sealing surfaces when the valve core is turned at an angle, and the sealing surfaces of the spherical valve disc and the valve seat will not wear, which increases the service life of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view of an embodiment;

[0017] Figure 2 It is a structural schematic diagram of an embodiment;

[0018] Figure 3 An exploded schematic diagram of an embodiment;

[0019] Figure 4 It is a schematic diagram of the internal structure of the valve opening of the embodiment;

[0020] Figure 5 This is a schematic diagram of the internal structure of the closed valve of the embodiment;

[0021] Figure 6 A cross-sectional view of an embodiment.

[0022] In the figure: 1. first limit screw; 2. movable connecting head; 3. movable pin; 4. straight inclined groove; 5. guide shaft; 6. connecting arm; 7. first air inlet and exhaust port; 8. piston rod; 9. second air inlet and exhaust port; 10. second limit screw; 11. spur gear; 12. rack; 13. anti-rotation block; 14. valve stem body; 15. valve stem head; 16. traction block; 17. spherical valve disc body; 18. valve seat sealing surface; 19. valve disc sealing surface; 20. positioning pin; 21. positioning movable block; 22. anti-upward displacement screw disk. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention are described clearly and completely below. 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 creative work are within the scope of protection of the present invention.

[0024] In the embodiment of the present invention,

[0025] A pneumatic double-track actuator expansion ball valve comprises a pneumatic double-track actuator and an expansion ball valve. The output parts of the pneumatic double-track actuator power are a movable connector 2 and a spur gear 11 in the pneumatic double-track actuator. The movable connector 2 and the spur gear 11 are connected to a valve stem body 14 of the expansion ball valve. A valve stem head 15 at the lower end of the valve stem body 14 of the expansion ball valve is provided with an inclined T-shaped groove. The valve stem head 15 at the lower end of the valve stem body 14 is provided with a T-shaped inclined groove connected to a traction block 16 arranged at the upper end of a spherical valve disc body 17. A pin shaft hole is designed at the lower end of the spherical valve disc body 17. A positioning pin shaft 20 is provided in the pin shaft hole at the lower end of the spherical valve disc body 17 and is connected to a positioning movable block 21. The lower end of the positioning movable block 21 is connected to an anti-upward displacement screw disk 22.

[0026] The pneumatic dual-track actuator includes a first driving member and a second driving member, and one end of the first driving member and the second driving member is provided with a power member for driving the first driving member and the second driving member to move. The power member is set as a cylinder, and the piston rod 8 of the cylinder is the power output end. One end of the piston rod 8 is sleeved with a piston, and the left and right cylinder heads of the cylinder are respectively provided with a first inlet and exhaust port 7 and a second inlet and exhaust port 9, and one end of the piston rod 8 is connected to a connecting arm 6, and the two ends of the connecting arm 6 are respectively fixedly connected to the guide shaft 5 and the rack 12.

[0027] The spur gear 11 is connected to an anti-rotation block 13. The inner holes of the spur gear 11 and the anti-rotation block 13 are both designed with keyways, and are movably fitted into a valve stem body 14 with a flat key. A straight oblique groove 4 is provided in the guide shaft 5 and passes through the guide shaft 5. The guide shaft 5 is provided with a movable pin 3 through the straight oblique groove 4. The movable pin 3 is connected to a movable connecting head 2, and the movable connecting head 2 is connected to one end of the valve stem body 14.

[0028] The pneumatic double-track actuator is provided with a box body, and a limit screw 1 is provided on an end cover on one side of the box body. The first limit screw 1 limits the guide shaft 5.

[0029] A second limiting screw 10 is provided on the end cover on one side of the cylinder, and the second limiting screw 10 limits the piston.

[0030] One end of the valve stem body 14 is connected to a valve stem head 15, and the valve stem head 15 is provided with a T-shaped inclined groove for accommodating a traction block 16, and the T-shaped inclined groove of the valve stem head 15 is connected to the traction block 16 with a T-shaped head.

[0031] The upper end of the spherical valve flap body 17 is provided with a first lug with a hole, and a traction block 16 with a T-shaped head is provided on the first lug with a hole. The lower end of the spherical valve flap body 17 is provided with a second lug with a hole.

[0032] The second perforated lug at the lower end of the spherical valve flap body 17 is connected to the positioning movable block 21 through a positioning pin 20 . The positioning movable block 21 is provided with a positioning pin 20 , and one end is sleeved on the outside of the positioning pin 20 .

[0033] The lower end of the positioning movable block 21 is provided with an anti-upward movement screw disk 22 .

[0034] A spherical valve flap sealing surface 19 is provided on the side of the spherical valve flap body 17 facing the valve seat, and a valve seat sealing surface 18 is provided on the side of the valve seat facing the valve flap body 17 .

[0035] The structural features of the pneumatic double-track actuator are as follows:

[0036] 1. The pneumatic double-track actuator replaces the original actuator that is a combination of a pneumatic linear actuator and a pneumatic angular stroke actuator;

[0037] 2. The pneumatic double-track actuator is a horizontally mounted actuator, which reduces the overall installation height of the valve;

[0038] 3. The single cylinder input of the pneumatic double-track actuator is transmitted through the straight inclined slot 4 and the spur gear 11 and rack 12, so that the actuator sequentially outputs linear and angular travel motions;

[0039] 4. The straight inclined groove 4 of the guide shaft 5 pushes and pulls the valve stem for output, which reduces the input force requirement and reduces the configuration of the cylinder.

[0040] Working principle:

[0041] When the valve is opened: the second air inlet and outlet port 9 takes in air, the piston rod 8 with the connecting arm 6 pushes the guide shaft 5 and the rack 12 to move horizontally to the left at the same time, the movable pin 3 moves vertically upward at the inclined groove position of the guide shaft 5, and the movable connecting head 2 installed on the movable pin 3 drives the valve stem body 14 and the valve stem head 15 with the T-shaped inclined groove to move upward. The two T-shaped traction blocks 16 arranged in the valve stem head 15 of the T-shaped inclined groove pull the spherical valve disc to swing toward the center of the valve under the action of the inclination of the valve stem head 15 of the T-shaped inclined groove, and the spherical valve disc sealing surface 19 is disengaged from the valve seat sealing surface 18, the valve starts to relieve pressure, and the piston rod 8 with the connecting arm 6 moves upward. Arm 6 continues to push guide shaft 5 and rack 12 to move horizontally to the left, moving pin shaft 3 into the position of the straight groove of straight inclined groove 4 on guide shaft 5, valve stem body 14 stops vertical movement, the anti-rotation plane of anti-rotation block 13 leaves the rack plane, removing the anti-rotation function, and the teeth of rack 12 begin to engage with spur gear 11, pushing spur gear 11 to rotate, driving valve stem and spherical valve disc to rotate together, and the end of guide shaft 5 hits the limit screw position and stops moving. At the same time, valve stem and spherical valve disc rotate 90° to stop, and the valve is fully opened. During the valve opening process, the spherical valve disc sealing surface 19 and the valve seat sealing surface 18 have been disengaged without any friction.

[0042] When closing the valve: the second air inlet and outlet 9 takes in air, the piston rod 8 with the connecting arm 6 pulls the guide shaft 5 and the rack 12 to move horizontally to the right at the same time, the movable pin 3 moves in the straight groove of the straight inclined groove 4 of the guide shaft 5, the valve stem does not move vertically, the rack 12 drives the spur gear 11 to rotate, driving the valve stem and the spherical valve disc to rotate to 90° together, the spur gear 11 leaves the meshing with the rack 12, the anti-rotation block 13 enters the plane of the rack 12 to prevent the gear from rotating due to inertia, the spherical valve disc stops rotating, and the piston rod 8 with the connecting arm 6 Continue to pull the guide shaft 5 to the right, and the movable pin 3 enters the bevel position of the straight bevel groove 4 of the guide shaft 5. The movable pin 3 moves vertically downward along the bevel groove, and the movable connecting head 2 and the valve stem and the T-shaped bevel groove valve stem head 15 installed on the movable pin 3 also move downward. The two T-head traction blocks 16 assembled in the T-shaped bevel groove valve stem head 15 push the spherical valve disc to the valve seat under the action of the bevel angle of the T-shaped bevel groove valve stem head 15, until the spherical valve disc sealing surface 19 and the valve seat sealing surface 18 are closed, and the valve is fully closed.

[0043] 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 according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pneumatic double-track actuator expansion ball valve, comprising a pneumatic double-track actuator and an expansion ball valve, characterized in that: The output element of the pneumatic dual-track actuator power is a movable connector (2) and a spur gear (11) in the pneumatic dual-track actuator. The movable connector (2) and the spur gear (11) are connected to a valve stem body (14) of a spread-open ball valve. A valve stem head (15) at the lower end of the valve stem body (14) of the spread-open ball valve is provided with an inclined T-shaped groove. A valve stem head (15) at the lower end of the valve stem body (14) is provided with a T-shaped inclined groove connected to a traction block (16) arranged at the upper end of a spherical valve disc body (17). A pin shaft hole is designed at the lower end of the spherical valve disc body (17). A positioning pin shaft (20) is arranged in the pin shaft hole at the lower end of the spherical valve disc body (17) and is connected to a positioning movable block (21). The lower end of the positioning movable block (21) is connected to an anti-upward displacement screw disc (22).

2. The pneumatic double-track actuator expansion ball valve according to claim 1, characterized in that: The pneumatic dual-track actuator comprises a first driving member and a second driving member, one end of the first driving member and the second driving member is provided with a power member for driving the first driving member and the second driving member to move, the power member is arranged as a cylinder, the piston rod (8) of the cylinder is the power output end, one end of the piston rod (8) is sleeved with a piston, the left and right cylinder heads of the cylinder are respectively provided with a first inlet and exhaust port (7) and a second inlet and exhaust port (9), one end of the piston rod (8) is connected to a connecting arm (6), and the two ends of the connecting arm (6) are respectively fixedly connected to the guide shaft (5) and the rack (12).

3. The pneumatic double-track actuator expansion ball valve according to claim 2 is characterized in that: The spur gear (11) is connected to an anti-rotation block (13); the inner holes of the spur gear (11) and the anti-rotation block (13) are both designed with keyways, and are movably fitted into a valve stem body (14) with a flat key; a straight inclined groove (4) penetrating the guide shaft (5) is provided in the guide shaft (5); a movable pin shaft (3) is provided on the guide shaft (5) through the straight inclined groove (4); the movable pin shaft (3) is connected to a movable connecting head (2); and the movable connecting head (2) is connected to one end of the valve stem body (14).

4. The pneumatic double-track actuator expansion ball valve according to claim 3 is characterized in that: The pneumatic double-track actuator is provided with a box body, and a limiting screw (1) is provided on an end cover on one side of the box body, and the first limiting screw (1) limits the guide shaft (5).

5. The pneumatic double-track actuator expansion ball valve according to claim 4, characterized in that: A second limiting screw (10) is provided on the end cover on one side of the cylinder, and the second limiting screw (10) limits the position of the piston rod (8).

6. The pneumatic double-track actuator expansion ball valve according to claim 5, characterized in that: One end of the valve stem body (14) is connected to a valve stem head (15), and the valve stem head (15) is provided with a T-shaped inclined groove for accommodating a traction block (16). The T-shaped inclined groove of the valve stem head (15) is connected to the traction block (16) with a T-shaped head.

7. The pneumatic double-track actuator expansion ball valve according to claim 6, characterized in that: The upper end of the spherical valve flap body (17) is provided with a first lug with a hole, a traction block (16) with a T-shaped head is provided on the first lug with a hole, and the lower end of the spherical valve flap body (17) is provided with a second lug with a hole.

8. The pneumatic double-track actuator expansion ball valve according to claim 7, characterized in that: The second perforated lug at the lower end of the spherical valve flap body (17) is connected to the positioning movable block (21) via a positioning pin shaft (20); the positioning movable block (21) is provided with a positioning pin shaft (20), one end of which is sleeved on the outside of the positioning pin shaft (20).

9. The pneumatic double-track actuator expansion ball valve according to claim 8, characterized in that: An anti-upward movement screw disk (22) is provided at the lower end of the positioning movable block (21).

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