Rotation angle limiting structure of plug valve

Abstract

According to the technical scheme, the plug valve rotation angle limiting structure is characterized in that the plug valve rotation angle limiting structure comprises a valve body and a valve rod installed on the valve body and further comprises a positioning disc installed on the valve body, a limiting piece detachably installed on the positioning disc and a limiting device installed on the valve rod; a plurality of through holes are formed in the circumferential direction of the positioning disc, and the limiting piece is inserted into one of the through holes; part of the limiting device is installed on the positioning disc, the valve rod drives the limiting device to rotate to abut against the limiting piece so as to limit further rotation of the valve rod, an operator inserts the limiting piece into the corresponding through hole according to the angle needing to be set, the limiting device rotates to abut against the limiting piece inserted into the through hole, and the limiting piece stops further rotation of the limiting device. The technical scheme has the beneficial effects that an operator can intuitively and quantitatively know the current opening state of the valve through the mutual matching of the positioning disc and the limiting piece.

Description

Technical Field

[0001] The utility model relates to the technical field of a valve and related devices, and more specifically, to a rotation angle limiting structure of a plug valve. Background Art

[0002] In pipeline systems used in petrochemicals, fine chemicals, or specific process flows, plug valves often require frequent and precise opening adjustments based on real-time operating conditions to achieve precise control of fluid flow. However, existing plug valves generally only have mechanical limit structures at the two extreme positions of fully open and fully closed, lacking effective positioning mechanisms for a large number of applications requiring frequent opening adjustments. This design flaw prevents operators from intuitively and quantitatively understanding the current valve opening state when adjusting the valve, and also makes it difficult to accurately reproduce or locate the specific opening value. Operators can only rely heavily on personal experience to roughly estimate the rotation range of the handwheel or handle. After adjustment, they must perform repeated trial-and-error adjustments and corrections by observing end-of-pipeline instruments (such as flow meters and pressure gauges) or relying on delayed feedback information from the final process results (such as reaction temperature and product composition). Utility Model Content

[0003] In view of the shortcomings of the existing technology, a plug valve rotation angle limiting structure is provided, which can solve the problem that the current valve opening state cannot be intuitively and quantitatively known.

[0004] Provided is a plug valve rotation angle limiting structure, comprising a valve body and a valve stem mounted on the valve body, a positioning plate mounted on the valve body, a limiting member detachably mounted on the positioning plate, and a limiting device mounted on the valve stem;

[0005] The positioning plate is provided with a plurality of through holes in its circumference, and the limiting member is inserted into one of the through holes;

[0006] Part of the limiting device is installed on the positioning plate, and the valve stem drives the limiting device to rotate and come into conflict with the limiting member, thereby limiting the valve stem from further rotation.

[0007] In a further optimization of the present invention, a sliding groove is provided around the positioning plate, and the limiting device includes a resisting member;

[0008] The resisting member is installed in the sliding groove, and the through hole is arranged on one side of the sliding groove and cooperates with the limiting member to extend into the sliding groove to limit further rotation of the resisting member.

[0009] According to a further optimization of the present invention, a groove is provided on the other side of the sliding slot corresponding to the through hole, and the limiting member is inserted into the groove after passing through the through hole.

[0010] Further optimization of the present invention is that a stabilizing groove is provided at the part of the through hole corresponding to the limiting member, a fixing portion is provided at one end of the limiting member, the limiting member passes through the through hole and is inserted into the groove, the fixing portion is accommodated in the stabilizing groove and is used to fix the limiting member.

[0011] Further optimization of the present invention is that a locking groove is provided in the through hole, and a locking block for cooperating with the locking groove is provided on the side of the limiting member. The limiting member extends into the through hole, and the limiting member is rotated so that the locking block and the locking groove cooperate with each other to lock the limiting member; the limiting member is rotated to separate the locking block from the locking groove, thereby releasing the locked state.

[0012] According to a further optimization of the present invention, the limiting device further comprises a connecting piece, the connecting piece and the resisting piece are threadedly connected, and a portion of the resisting piece is exposed outside the sliding groove for threaded connection of the connecting piece.

[0013] In a further optimization of the present invention, the interference piece is spherical.

[0014] This technical solution has the following beneficial effects: through the cooperation between the positioning plate and the limit member, the operator can intuitively and quantitatively know the current valve opening state. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural diagram of a plug valve rotation angle limiting structure.

[0016] Figure 2 The figure is a cross-sectional schematic diagram of a positioning plate.

[0017] Figure 3 It is a schematic diagram of a three-dimensional structure in which a resisting member and a connecting member are connected.

[0018] Figure numerals: 1. valve body; 2. valve stem; 3. positioning plate; 31. through hole; 32. sliding groove; 33. groove; 34. stabilizing groove; 35. locking groove; 4. limiting member; 41. fixing part; 42. locking block; 5. limiting device; 51. interference member; 52. connecting member. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. Identical components are denoted by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom," "top," "inner," and "outer" refer to directions toward or away from the geometric center of a particular component, respectively.

[0020] Reference Figure 1-3As shown, a plug valve rotation angle limiting structure includes a valve body 1 and a valve stem 2 mounted on the valve body 1, a positioning plate 3 mounted on the valve body 1, a limiting member 4 detachably mounted on the positioning plate 3, and a limiting device 5 mounted on the valve stem 2;

[0021] The positioning plate 3 is provided with a plurality of through holes 31 in the circumference, and the limiting member 4 is inserted into one of the through holes 31;

[0022] Part of the limiting device 5 is installed on the positioning plate 3. The valve stem 2 drives the limiting device 5 to rotate and come into conflict with the limiting member 4, thereby limiting the valve stem 2 from further rotation.

[0023] The positioning disk 3 may be provided with a scale for the convenience of the user to check, and then the operator inserts the limit piece 4 into the corresponding through hole 31 according to the required setting angle. When the valve stem 2 rotates, the limit device 5 is driven to rotate synchronously. When the limit device 5 moves to conflict with the limit piece 4 inserted into the through hole 31, the limit piece 4 blocks the limit device 5 from further rotation, so that the valve stem 2 stops rotating, thereby quickly rotating the valve core opening to a preset angle position. The operator can also make choices according to different situations, by selecting different through holes 31 to plug in the limit pieces 4. At the same time, if there is a need to gradually reduce or increase the flow rate, multiple limit pieces 4 can also be inserted to form multiple gears. When switching is required, the limit piece 4 is removed to allow the valve stem 2 to continue to rotate to the next position.

[0024] Preferably, a sliding groove 32 is provided around the positioning plate 3, and the limiting device 5 includes a resisting member 51;

[0025] The resisting member 51 is installed in the sliding groove 32 . The through hole 31 is provided on one side of the sliding groove 32 and cooperates with the limiting member 4 to extend into the sliding groove 32 to limit further rotation of the resisting member 51 .

[0026] When the valve stem 2 rotates, the resistance member 51 is driven to move along the fixed track of the sliding groove 32. When the resistance member 51 moves to contact the limit member 4 in the through hole 31, the limit member 4 limits the further rotation of the resistance member 51, thereby limiting the rotation of the valve stem 2. The fixed track allows the resistance member 51 and the limit member 4 to be restricted in the same position multiple times, and the resistance surface of the resistance member 51 against the limit member 4 is consistent, so that there will be no angular deviation in each rotation of the valve stem 2 due to different resistance surfaces.

[0027] Preferably, a groove 33 is provided on the other side of the sliding groove 32 corresponding to the through hole 31 , and the limiting member 4 is inserted into the groove 33 after passing through the through hole 31 .

[0028] After the limit member 4 passes through the through hole 31, its end is inserted into the groove 33, so that the limit member 4 is restricted from movement by the through hole 31 and the groove 33 at the same time. When the resistance member 51 moves along the sliding groove 32 to resist the limit member 4, the resistance member 51 hits the limit member 4, and the limit member 4 disperses the impact force through the groove 33 and the through hole 31, so that the limit member 4 reduces movement and increases the accuracy of each rotation of the valve stem 2 to the set position. At the same time, the through hole 31 and the groove 33 disperse the force, which can extend the service life of the limit member 4.

[0029] Preferably, a stabilizing groove 34 is provided in the portion of the through hole 31 corresponding to the limiting member 4, and a fixing portion 41 is provided at one end of the limiting member 4. The limiting member 4 passes through the through hole 31 and is inserted into the groove 33. The fixing portion 41 is accommodated in the stabilizing groove 34 and is used to fix the limiting member 4.

[0030] The fixing portion 41 can also be provided with a force-applying member to provide the operator with hand operation space when applying force. At the same time, one end of the limit member 4 is embedded in the groove 33, and the fixing portion 41 at the other end is embedded in the stabilizing groove 34. The middle part is fixed by the through hole 31, thereby improving the overall stability of the limit member 4. The groove 33 and the stabilizing groove 34 limit the shaking of the limit member 4 in the through hole 31. When the resisting member 51 hits the limit member 4, the impact force is transmitted to the positioning plate 3 through the contact surface between the fixing portion 41 and the stabilizing groove 34, thereby avoiding the force from being concentrated on the limit member 4 and extending the service life of the limit member 4. At the same time, the stabilizing groove 34 and the fixing portion 41 are correspondingly arranged, and both can be set to irregular shapes, and the shapes of the stabilizing groove 34 and the fixing portion 41 are adapted to increase the contact area, thereby increasing friction and preventing falling off.

[0031] Preferably, a locking groove 35 is provided in the through hole 31, and a locking block 42 for cooperating with the locking groove 35 is provided on the side of the limit member 4. The limit member 4 extends into the through hole 31, and the limit member 4 is rotated so that the locking block 42 and the locking groove 35 cooperate with each other to lock the limit member 4; the limit member 4 is rotated to separate the locking block 42 from the locking groove 35, thereby releasing the locked state.

[0032] The operator presses the limit member 4 into the through hole 31, rotates the limit member 4 so that the locking block 42 abuts against the locking groove 35 to achieve a locked state, and rotates the limit member 4 in the opposite direction to unlock, and the locking block 42 separates from the locking groove 35. This design facilitates the operator's operation. The locking block 42 and the locking groove 35 cooperate with each other to maintain the locked state, thereby preventing the limit member 4 from being detached when the valve body 1 vibrates.

[0033] Preferably, the limiting device 5 further includes a connecting member 52 , and the connecting member 52 and the resisting member 51 are threadedly connected. The resisting member 51 is partially exposed outside the sliding groove 32 for the connecting member 52 to be threadedly connected.

[0034] When the valve stem 2 rotates, the resistance member 51 is driven to move along the sliding groove 32 through the connecting member 52. When the resistance member 51 contacts the limit member 4, the opening is limited. The threaded connection enables the resistance member 51 and the connecting member 52 to form a detachable structure, ensuring that the resistance member 51 can be driven to move by the connecting member 52 when the valve stem 2 rotates. At the same time, this structure allows the resistance member 51 or the connecting member 52 to be disassembled and replaced separately during maintenance and repair, thereby reducing maintenance costs.

[0035] Preferably, the resisting member 51 is spherical.

[0036] The contact between the spherical abutment 51 and the limiting member 4 is point-fitting, which reduces frictional resistance compared to surface contact and reduces wear between the abutment 51 and the sliding groove 32 .

[0037] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A plug valve rotation angle limiting structure, comprising a valve body and a valve stem mounted on the valve body, characterized in that: It includes a positioning plate installed on the valve body, a limiting member detachably installed on the positioning plate, and a limiting device installed on the valve stem; The positioning plate is provided with a plurality of through holes in its circumference, and the limiting member is inserted into one of the through holes; Part of the limiting device is installed on the positioning plate, and the valve stem drives the limiting device to rotate and come into conflict with the limiting member, thereby limiting the valve stem from further rotation.

2. The plug valve rotation angle limiting structure according to claim 1, characterized in that: A sliding groove is provided around the positioning plate, and the limiting device includes a resisting member; The resisting member is installed in the sliding groove, and the through hole is arranged on one side of the sliding groove and cooperates with the limiting member to extend into the sliding groove to limit further rotation of the resisting member.

3. The plug valve rotation angle limiting structure according to claim 2, characterized in that: A groove is provided on the other side of the sliding slot corresponding to the through hole, and the limiting member is inserted into the groove after passing through the through hole.

4. The plug valve rotation angle limiting structure according to claim 3, characterized in that: The portion of the through hole corresponding to the limiting member is provided with a stabilizing groove, one end of the limiting member is provided with a fixing portion, the limiting member passes through the through hole and is inserted into the groove, the fixing portion is accommodated in the stabilizing groove and is used to fix the limiting member.

5. The plug valve rotation angle limiting structure according to claim 2, characterized in that: A locking groove is provided in the through hole, and a locking block for cooperating with the locking groove is provided on the side of the limiting member. The limiting member extends into the through hole, and the limiting member is rotated so that the locking block and the locking groove cooperate with each other to lock the limiting member; the limiting member is rotated to separate the locking block from the locking groove, thereby releasing the locked state.

6. The plug valve rotation angle limiting structure according to claim 2, characterized in that: The limiting device also includes a connecting piece, the connecting piece and the resistance piece are threadedly connected, and the resistance piece is partially exposed outside the sliding groove for the connecting piece to be threadedly connected.

7. The plug valve rotation angle limiting structure according to any one of claims 2 to 6, characterized in that: The resistance piece is spherical.

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