Ball valve with jamming protection function

Abstract

The ball valve with the jamming protection function comprises a valve body, a support, a valve rod, an actuator and a ball body, the support is installed at the upper end of the valve body, the actuator is installed on the support, the valve rod penetrates through the upper end of the valve body and extends into the valve body to be connected with the ball body, the upper end of the valve rod is connected with the output end of the actuator, and a valve seat is arranged in the valve body. The protection mechanism comprises a driving rod and a damping sleeve, the valve rod comprises an upper shaft rod and a lower shaft rod, the upper end of the upper shaft rod is connected with the output end of the actuator, the lower end of the lower shaft rod is connected with the ball body, the driving rod is installed at the lower end of the upper shaft rod, the damping sleeve is installed at the upper end of the lower shaft rod, the driving rod is inserted into the damping sleeve, and the driving rod and the damping sleeve are matched in a damping mode. When the ball body is stuck, the driving rod overcomes the damping force of the damping sleeve to idle. The ball valve has a jamming protection function, when the valve is jammed, the output end of the actuator idles, the valve rod is prevented from being subjected to large torque, and the effect of protecting the valve rod, the ball body and the valve seat is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a ball valve with a blocking protection function. Background Art

[0002] Ball valves are widely used in fluid control. In fluid control applications, ball valves are mainly used in pipelines to open, close, distribute the flow of fluid media, change the flow direction and flow rate of fluid media, etc.

[0003] Currently, ball valves on the market typically consist of a valve body, bonnet, stem, and ball. The bonnet is mounted on top of the valve body, while the stem extends through the bonnet and into the valve body, interlocking with the ball. The valve body houses a valve seat, which forms a seal with the ball when the valve is closed. During use, a ball valve may become stuck due to internal component damage, contamination (such as crystallization of the medium or accumulation of solid impurities), or overtightening, preventing the stem from rotating the ball. Forced actuation of the valve by an actuator can lead to further sticking, stem bending, and sealing surface damage. Therefore, a ball valve with a jam protection feature is needed to prevent this. Utility Model Content

[0004] The purpose of the utility model is to provide a ball valve with a jam protection function. When the valve is stuck, the output end of the actuator idles to prevent the valve stem from being subjected to a large torque, thereby protecting the valve stem, the ball and the valve seat.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a ball valve with a jam protection function, comprising a valve body, a bracket, a valve stem, an actuator and a ball, the bracket being mounted on the upper end of the valve body, the actuator being mounted on the bracket, the valve stem passing through the upper end of the valve body and extending into the interior of the valve body to be connected to the ball, the upper end of the valve stem being connected to the output end of the actuator, valve seats for sealing with the ball when the valve is closed being provided at positions on the inner wall of the valve body corresponding to both sides of the ball; and a protection mechanism comprising a drive rod and a damping sleeve, the valve stem comprising an upper shaft rod and a lower shaft rod, the upper end of the upper shaft rod being connected to the output end of the actuator, the lower end of the lower shaft rod being connected to the ball, the drive rod being mounted on the lower end of the upper shaft rod, the damping sleeve being mounted on the upper end of the lower shaft rod, the drive rod being inserted into the damping sleeve, and the damping cooperation between the two realizes circumferential linkage, and when the ball is stuck, the drive rod overcomes the damping force of the damping sleeve and rotates idly.

[0006] By adopting the above technical solution, the valve stem is split into two parts, an upper shaft rod and a lower shaft rod, which are connected by a protection mechanism composed of a drive rod and a damping sleeve. When the valve is working normally, due to the damping cooperation between the drive rod and the damping sleeve, when the actuator drives the upper shaft rod to rotate, the upper shaft rod drives the lower shaft rod to rotate, and the lower shaft rod drives the ball to rotate, thereby realizing the opening and closing of the valve; when the ball (or the lower shaft rod) is stuck, the drive rod overcomes the damping force of the damping sleeve to produce a rotation relative to the damping sleeve, and the actuator drives the upper shaft rod to idle and unload the force, thereby significantly reducing the torque on the lower shaft rod and the ball, avoiding further obstruction, valve stem bending, and sealing surface damage, thereby protecting the valve stem, ball and valve seat.

[0007] The utility model is further configured as follows: a plurality of driving protrusions are provided on the outer circular surface of the driving rod, and the driving protrusions are in the shape of an outwardly protruding arc surface; a plurality of linkage recesses for the driving protrusions to be embedded are provided on the inner circular surface of the damping sleeve, and a damping protrusion is provided between each two adjacent linkage recesses, and the damping protrusions are in the shape of an inwardly protruding arc surface, and the damping protrusions are used to hinder the corresponding driving protrusions from performing circumferential movement relative to the damping sleeve.

[0008] By adopting the above technical solution, when the valve is working normally, the upper shaft rod and the lower shaft rod are linked by the cooperation between the driving protrusion on the driving rod and the linkage recess on the damping sleeve, and the arc surface structure design of the driving protrusion and the damping protrusion makes it easier for the driving protrusion and the damping protrusion to produce relative rotation through deformation when the valve is stuck.

[0009] The present invention is further configured such that a position of the damping sleeve corresponding to each damping protrusion is respectively provided with a clearance hole extending along the axial direction of the damping sleeve.

[0010] By adopting the above technical solution, the design of the relief hole is more conducive to the inward deformation of the damping protrusion when it is subjected to a large positive pressure, so as to drive the protrusion to move from the initial linkage recess to the next linkage recess in sequence.

[0011] The present invention is further configured such that a first mounting groove is provided at the lower end of the upper shaft rod, the upper end of the driving rod is inserted into the first mounting groove, and the driving rod and the upper shaft rod are fixed by a pin.

[0012] By adopting the above technical solution, the drive rod and the upper shaft rod can be fixedly connected, the connection structure is simple and reliable, and disassembly and assembly are very convenient.

[0013] The utility model is further configured such that a second mounting groove is provided at the upper end of the lower shaft, the damping sleeve is inserted into the second mounting groove, and a plurality of linkage protrusions are distributed in a circular array on the inner circumferential surface of the second mounting groove, and each linkage protrusion extends axially along the damping sleeve, and a plurality of linkage grooves that fit with the linkage protrusions are provided on the outer circumferential surface of the damping sleeve.

[0014] By adopting the above technical solution, the circumferential linkage of the damping sleeve on the lower shaft can be achieved, and disassembly and assembly are very convenient.

[0015] The present invention is further configured such that a positioning protrusion is coaxially provided on the upper end of the lower shaft rod, and a positioning groove that fits with the positioning protrusion is provided on the lower end of the lower shaft rod.

[0016] By adopting the above technical solution, the coaxiality between the upper shaft and the lower shaft can be further guaranteed, thereby improving the stability of their movement.

[0017] The utility model is further configured such that the upper end of the valve body is provided with a sealing groove coaxial with the lower shaft rod, a packing is embedded in the sealing groove, the upper end of the valve body is also connected to a pressure cover via a fastener, and the lower end of the pressure cover extends into the sealing groove to press the packing in the sealing groove.

[0018] By adopting the above technical solution, the sealing between the valve body and the lower shaft can be ensured, and the internal medium can be prevented from leaking to the outside through the gap between the two.

[0019] The present invention is further configured such that a limiting flange is integrally provided at the portion of the outer periphery of the lower shaft extending into the valve body, the upper end face of the limiting flange abuts against the inner wall of the valve body, and a first gasket is sandwiched between the two, and a limiting ring is sleeved on the portion of the lower shaft corresponding to the outside of the valve body, and a locking screw is radially threaded on the outer circumferential surface of the limiting ring. When the locking screw is tightened, the inner end of the locking screw abuts against the outer circumferential surface of the lower shaft, and a second gasket is sandwiched between the limiting ring and the pressure cover.

[0020] By adopting the above technical solution, the lower valve stem can be axially limited, further improving the stability of its movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of the middle part A;

[0023] Figure 3 Schematic diagram of the assembly structure of the driving rod and the damping sleeve of this utility model;

[0024] Figure 4This is an exploded view of the driving rod and the damping sleeve of the utility model;

[0025] Figure 5 It is a structural schematic diagram of the lower shaft rod of the utility model.

[0026] In the figure: 1. valve body; 2. bracket; 3. valve stem; 4. actuator; 5. ball; 6. valve seat; 7. protection mechanism; 8. drive rod; 9. damping sleeve; 10. upper shaft; 11. lower shaft; 12. drive protrusion; 13. linkage recess; 14. damping protrusion; 15. clearance hole; 16. first mounting groove; 17. pin; 18. second mounting groove; 19. linkage protrusion; 20. linkage groove; 21. positioning protrusion; 22. positioning groove; 23. sealing groove; 24. packing; 25. gland; 26. limiting flange; 27. first gasket; 28. limiting ring; 29. ​​locking screw; 30. second gasket. DETAILED DESCRIPTION

[0027] 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.

[0028] Example: As shown in the attached Figures 1 to 5The ball valve with a jam protection function shown in the figure includes a valve body 1, a bracket 2, a valve stem 3, an actuator 4 and a ball 5. The bracket 2 is installed on the upper end of the valve body 1, and the actuator 4 is installed on the bracket 2. The actuator 4 can be a combination of a handwheel and a reducer, or it can be any one of an electric actuator, a pneumatic actuator, a hydraulic actuator, and a manual-automatic actuator. The valve stem 3 passes through the upper end of the valve body 1 and extends into the interior of the valve body 1 to be connected to the ball 5. The two can be connected by a key connection or a mortise and tenon connection. The upper end of the valve stem 3 is connected to the output end of the actuator 4. The two can specifically be connected by a coupling or a key connection. The inner wall of the valve body 1 is provided with a position corresponding to both sides of the ball 5 for connecting with the actuator when the valve is closed. The sphere 5 constitutes a sealed valve seat 6; the ball valve also includes a protection mechanism 7, which includes a drive rod 8 and a damping sleeve 9. The drive rod 8 and the damping sleeve 9 can be made of plastic material. The valve stem 3 includes an upper shaft rod 10 and a lower shaft rod 11. The upper shaft rod 10 and the lower shaft rod 11 are coaxially arranged. The upper end of the upper shaft rod 10 is connected to the output end of the actuator 4, and the lower end of the lower shaft rod 11 is connected to the sphere 5. The drive rod 8 is installed at the lower end of the upper shaft rod 10, and the damping sleeve 9 is installed at the upper end of the lower shaft rod 11. The drive rod 8 is inserted into the damping sleeve 9, and the damping cooperation of the two realizes circumferential linkage. When the sphere 5 is stuck, the drive rod 8 overcomes the damping force of the damping sleeve 9 and idles. The valve stem 3 is divided into an upper shaft rod 10 and a lower shaft rod 11, which are connected by a protection mechanism 7 composed of a drive rod 8 and a damping sleeve 9. When the valve is working normally, due to the damping cooperation between the drive rod 8 and the damping sleeve 9, when the actuator 4 drives the upper shaft rod 10 to rotate, the upper shaft rod 10 drives the lower shaft rod 11 to rotate, and the lower shaft rod 11 drives the ball 5 to rotate, thereby realizing the opening and closing of the valve; when the ball 5 (or the lower shaft rod 11) is stuck, the drive rod 8 overcomes the damping force of the damping sleeve 9 to rotate relative to the damping sleeve 9, and the actuator 4 drives the upper shaft rod 10 to idle and unload the force, thereby significantly reducing the torque applied to the lower shaft rod 11 and the ball 5, avoiding further obstruction, bending of the valve stem 3 and damage to the sealing surface, thereby protecting the valve stem 3, the ball 5 and the valve seat 6.

[0029] As attached Figures 2 to 5As shown, a plurality of driving protrusions 12 are provided on the outer circumferential surface of the driving rod 8. The driving protrusion 12 is a long strip structure. The driving protrusion 12 is in the shape of an outwardly protruding arc surface. The inner circumferential surface of the damping sleeve 9 is provided with a plurality of linkage recesses 13 for the driving protrusions 12 to be embedded, and a damping protrusion 14 is provided between each two adjacent linkage recesses 13. The damping protrusion 14 is in the shape of an inwardly protruding arc surface. The damping protrusion 14 is used to hinder the corresponding driving protrusion 12 from performing circumferential movement relative to the damping sleeve 9. In this embodiment, the number of the driving protrusions 12, the linkage recesses 13 and the damping protrusions 14 are all eight. When the valve is operating normally, the upper shaft 10 and the lower shaft 11 are linked by the cooperation between the driving protrusion 12 on the driving rod 8 and the linkage recess 13 on the damping sleeve 9. The arc surface structure design of the driving protrusion 12 and the damping protrusion 14 makes it easy for the driving protrusion 12 and the damping protrusion 14 to produce relative rotation through deformation when the valve is stuck.

[0030] As attached Figure 3 As shown, the damping sleeve 9 is provided with a clearance hole 15 extending axially along the damping sleeve 9 at a position corresponding to each damping protrusion 14. The design of the clearance hole 15 is more conducive to the inward deformation of the damping protrusion 14 when subjected to a large positive pressure, thereby allowing the driving protrusion 12 to move from the initial linkage recess 13 to the next linkage recess 13 in sequence.

[0031] As attached Figures 2 to 5 As shown, the lower end of the upper shaft 10 is provided with a first mounting groove 16, and the upper end of the drive rod 8 is inserted into the first mounting groove 16. The drive rod 8 and the upper shaft 10 are fixed by a pin 17. That is, the upper shaft 10 is provided with an outer hole radially connected to the first mounting groove 16 for the pin 17 to pass through, and the drive rod 8 is provided with an inner hole for the pin 17 to pass through. This design can achieve a fixed connection between the drive rod 8 and the upper shaft 10, and the connection structure is simple and reliable, and it is very convenient to assemble and disassemble.

[0032] As attached Figures 2 to 5 As shown, the upper end of the lower shaft 11 is provided with a second mounting groove 18, into which the damping sleeve 9 is inserted. A plurality of linkage protrusions 19 are distributed in a circumferential array on the inner circumferential surface of the second mounting groove 18, each linkage protrusion 19 extending axially along the damping sleeve 9. The outer circumferential surface of the damping sleeve 9 is provided with a plurality of linkage grooves 20 that fit with the linkage protrusions 19. This design enables circumferential linkage of the damping sleeve 9 on the lower shaft 11, making assembly and disassembly very convenient.

[0033] As attached Figure 2As shown, the upper end of the lower shaft 11 is coaxially provided with a positioning protrusion 21, and the lower end of the lower shaft 11 is provided with a positioning groove 22 that fits with the positioning protrusion 21. This design can further ensure the coaxiality between the upper shaft 10 and the lower shaft 11, and improve the stability of their movement.

[0034] As attached Figure 1 As shown, the upper end of the valve body 1 is provided with a sealing groove 23 coaxial with the lower shaft 11. A packing 24 is embedded in the sealing groove 23 and arranged on the outer periphery of the lower shaft 11. The upper end of the valve body 1 is also connected to a gland 25 via fasteners, and the lower end of the gland 25 extends into the sealing groove 23 to press the packing 24 in the sealing groove 23. This design ensures the sealing between the valve body 1 and the lower shaft 11, preventing the internal medium from leaking to the outside through the gap between the two.

[0035] As attached Figures 1 to 5 As shown, a limiting flange 26 is integrally provided at the portion of the lower stem 11 extending into the valve body 1. The upper end surface of the limiting flange 26 abuts against the inner wall of the valve body 1, with a first washer 27 sandwiched between the two. A limiting ring 28 is sleeved on the portion of the lower stem 11 corresponding to the exterior of the valve body 1. A locking screw 29 is radially threaded onto the outer circumference of the limiting ring 28. When the locking screw 29 is tightened, the inner end of the locking screw 29 abuts against the outer circumference of the lower stem 11. A second washer 30 is sandwiched between the limiting ring 28 and the gland 25. This design can achieve axial limitation of the lower valve stem 3, further improving its movement stability.

Claims

1. A ball valve with a jam protection function, comprising a valve body (1), a bracket (2), a valve stem (3), an actuator (4) and a ball (5), wherein the bracket (2) is mounted on the upper end of the valve body (1), the actuator (4) is mounted on the bracket (2), the valve stem (3) passes through the upper end of the valve body (1) and extends into the interior of the valve body (1) to be connected to the ball (5), the upper end of the valve stem (3) is connected to the output end of the actuator (4), and valve seats (6) are provided on the inner wall of the valve body (1) at positions corresponding to both sides of the ball (5) for forming a sealing fit with the ball (5) when the valve is closed; characterized in that: The invention also includes a protection mechanism (7), wherein the protection mechanism (7) includes a driving rod (8) and a damping sleeve (9), and the valve stem (3) includes an upper shaft rod (10) and a lower shaft rod (11). The upper end of the upper shaft rod (10) is connected to the output end of the actuator (4), and the lower end of the lower shaft rod (11) is connected to the ball (5). The driving rod (8) is installed at the lower end of the upper shaft rod (10), and the damping sleeve (9) is installed at the upper end of the lower shaft rod (11). The driving rod (8) is inserted into the damping sleeve (9), and the two are matched with each other to realize circumferential linkage. When the ball (5) is stuck, the driving rod (8) overcomes the damping force of the damping sleeve (9) and rotates idly.

2. A ball valve with a jam protection function according to claim 1, characterized in that: A plurality of driving protrusions (12) are provided on the outer circumferential surface of the driving rod (8), and the driving protrusions (12) are in the shape of an outwardly protruding arc surface. A plurality of linkage recesses (13) for embedding the driving protrusions (12) are provided on the inner circumferential surface of the damping sleeve (9), and a damping protrusion (14) is provided between each two adjacent linkage recesses (13). The damping protrusion (14) is in the shape of an inwardly protruding arc surface, and the damping protrusion (14) is used to prevent the corresponding driving protrusion (12) from performing circumferential movement relative to the damping sleeve (9).

3. The ball valve with a jam protection function according to claim 2, characterized in that: The damping sleeve (9) is provided with a clearance hole (15) at a position corresponding to each damping protrusion (14), the clearance hole extending along the axial direction of the damping sleeve (9).

4. The ball valve with a jam protection function according to claim 2, characterized in that: The lower end of the upper shaft (10) is provided with a first mounting groove (16), the upper end of the driving rod (8) is inserted into the first mounting groove (16), and the driving rod (8) and the upper shaft (10) are fixed by a pin (17).

5. The ball valve with a jam protection function according to claim 2, characterized in that: A second mounting groove (18) is provided at the upper end of the lower shaft (11), and the damping sleeve (9) is inserted into the second mounting groove (18). A plurality of linkage protrusions (19) are distributed in a circumferential array on the inner circumferential surface of the second mounting groove (18), and each linkage protrusion (19) extends axially along the damping sleeve (9). A plurality of linkage grooves (20) that fit with the linkage protrusions (19) are provided on the outer circumferential surface of the damping sleeve (9).

6. The ball valve with a jam protection function according to claim 2, characterized in that: The upper end of the lower shaft rod (11) is coaxially provided with a positioning protrusion (21), and the lower end of the lower shaft rod (11) is provided with a positioning groove (22) that fits with the positioning protrusion (21).

7. The ball valve with a jam protection function according to claim 2, characterized in that: The upper end of the valve body (1) is provided with a sealing groove (23) coaxial with the lower shaft (11), and a packing (24) is embedded in the sealing groove (23). The upper end of the valve body (1) is also connected to a pressure cover (25) via a fastener, and the lower end of the pressure cover (25) extends into the sealing groove (23) to press the packing (24) in the sealing groove (23).

8. The ball valve with a jam protection function according to claim 7, characterized in that: A limiting flange (26) is integrally provided at the portion of the outer periphery of the lower shaft (11) that extends into the valve body (1), the upper end surface of the limiting flange (26) abuts against the inner wall of the valve body (1), and a first gasket (27) is sandwiched between the two. A limiting ring (28) is sleeved on the portion of the lower shaft (11) corresponding to the outside of the valve body (1), and a locking screw (29) is radially threaded on the outer circumference of the limiting ring (28). When the locking screw (29) is tightened, the inner end of the locking screw (29) abuts against the outer circumference of the lower shaft (11), and a second gasket (30) is sandwiched between the limiting ring (28) and the pressure cover (25).

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