Anti-falling butterfly valve with double eccentric pin shafts

Abstract

The utility model belongs to the field of valves, and particularly relates to a double-eccentric-pin-shaft anti-falling butterfly valve which comprises a valve body, and a liquid inlet end base and a liquid outlet end base are arranged on the valve body in the medium conveying direction. The driving mechanism comprises a valve seat installed on the upper portion of the valve body, a driving device is arranged above the valve seat, the valve seat and the valve body are connected through a hollow rod sleeve, a valve rod penetrating through the rod sleeve is installed at the output end of the driving device, and a butterfly plate with a protruding single side is installed outside the valve rod. Three groups of water receiving plates of the self-locking mechanism are uniformly distributed on a convex rod at an angle of 120 degrees, an inclination angle is formed between the plate surface and the flow direction of a medium, when the medium passes through, the water receiving plates are impacted by fluid to generate rotating torque, a bolt ring connected with the convex rod is driven to rotate along an inner cavity of a self-locking frame, a pin shaft screwed into a bolt sleeve is pushed to rotate, and then the butterfly plate is tightly pressed, and the pressing force is in positive correlation with the flow speed of the medium; the effect of locking along with washing is achieved, and the problem that the pin shaft falls off in the using process is effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of valves, specifically to a double eccentric pin anti-detachment butterfly valve. Background Technology

[0002] The core feature of an eccentric butterfly valve is that the valve stem axis is simultaneously offset from both the center of the butterfly plate and the center of the valve body, achieving an asymmetrical torque distribution through a tapered sealing pair. Compared to a concentric butterfly valve, its eccentric design causes the butterfly plate to move along a "disengagement before contact" trajectory with the valve seat during opening and closing, significantly reducing frictional torque and wear.

[0003] Because the center of the butterfly plate is offset from the valve stem axis, a pin is needed to connect the valve stem to the butterfly plate during installation. During the valve opening and closing process, the pin serves as the support shaft for the rotation of the butterfly plate. During use, vibration, impact or material fatigue may cause the pin to fall off unexpectedly. Utility Model Content

[0004] (I) Purpose of the utility model

[0005] To address the technical problems existing in the background art, this utility model proposes a double eccentric pin anti-detachment butterfly valve, which has the feature of self-locking design to prevent pin detachment.

[0006] (II) Technical Solution

[0007] To solve the above technical problems, this utility model provides a double eccentric pin anti-drop butterfly valve, including a valve body, on which an inlet end seat and an outlet end seat are provided along the medium transmission direction;

[0008] The drive mechanism includes a valve seat mounted on the upper part of the valve body, a drive device disposed above the valve seat, the valve seat and the valve body being connected by a hollow rod sleeve, a valve stem penetrating the rod sleeve being mounted at the output end of the drive device, and a butterfly plate with a single-sided protrusion being mounted on the outside of the valve stem.

[0009] The self-locking mechanism includes a self-locking frame sleeved on the outside of the valve stem. A bolt ring is provided in the middle of the self-locking frame. One end of the bolt ring, which penetrates into the inner cavity of the self-locking frame, is connected to a pin, and the other end is formed with a protruding rod. Several water receiving plates are connected to the protruding rod.

[0010] The pressure plate mechanism includes a pressure plate that connects to the butterfly plate. A bolt sleeve is formed in the middle of the pressure plate, which passes through the butterfly plate and the valve stem. The bolt sleeve and the pin are threaded together for fixation.

[0011] Preferably, the butterfly plate and the valve stem are held between the pressure plate and the self-locking frame.

[0012] Preferably, the self-locking mechanism moves synchronously with the valve stem, and the water receiving plate is provided in three sets, rotating with the medium transmission.

[0013] Preferably, a sealing element is placed in the gap between the self-locking frame and the bolt ring.

[0014] Preferably, the pressure plate has several through slots, and a positioning element for connecting the butterfly plate passes through the through slots.

[0015] Preferably, the reinforcement mechanism includes a valve stem sleeve fitted over the valve stem, the valve stem sleeve having raised ribs formed at both ends, and the ribs and the end faces to which the butterfly plate is attached are fixed by rib bolts.

[0016] The above-mentioned technical solution of this utility model has the following beneficial technical effects: the three sets of water receiving plates of the self-locking mechanism are evenly distributed on the protruding rod at 120°, and the plate surface has an inclination angle with the medium flow direction. When the medium passes through, the water receiving plate is subjected to fluid impact and generates rotational torque, which drives the bolt ring connected to the protruding rod to rotate along the inner cavity of the self-locking frame, pushes the pin shaft screwed into the bolt sleeve to rotate, and then presses it in the direction of the butterfly plate. The pressing force is positively correlated with the medium flow rate, so as to achieve the effect of locking more and more as it is flushed, effectively solving the problem of the pin shaft falling off during use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the self-locking mechanism of this utility model;

[0019] Figure 3 This is a schematic diagram of the implementation structure of this utility model.

[0020] Figure label:

[0021] 11. Valve body; 12. Inlet seat; 13. Outlet seat; 21. Valve seat; 22. Drive unit; 23. Rod sleeve; 24. Valve stem; 25. Butterfly plate; 31. Self-locking frame; 32. Bolt ring; 33. Protruding rod; 34. Water receiving plate; 35. Pin; 41. Pressure plate; 42. Bolt sleeve; 43. Positioning component; 5. Sealing component; 61. Valve stem sleeve; 62. Rib plate; 63. Rib plate bolt. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0023] like Figure 1-3As shown, the present invention proposes a double eccentric pin anti-drop butterfly valve, which includes a valve body 11, and an inlet end seat 12 and an outlet end seat 13 are provided on the valve body 11 along the medium transmission direction.

[0024] The drive mechanism includes a valve seat 21 mounted on the upper part of the valve body 11, a drive device 22 disposed above the valve seat 21, the valve seat 21 and the valve body 11 are connected by a hollow rod sleeve 23, a valve stem 24 that passes through the rod sleeve 23 is mounted at the output end of the drive device 22, and a butterfly plate 25 with a single-sided protrusion is mounted on the outside of the valve stem 24.

[0025] The self-locking mechanism includes a self-locking frame 31 sleeved outside the valve stem 24. A bolt ring 32 is provided in the middle of the self-locking frame 31. One end of the bolt ring 32, which penetrates into the inner cavity of the self-locking frame 31, is connected to a pin 35. The other end is formed with a protruding convex rod 33. Several water receiving plates 34 are connected to the convex rod 33.

[0026] The pressure plate mechanism includes a pressure plate 41 that connects to the butterfly plate 25. A bolt sleeve 42 is formed in the middle of the pressure plate 41, which passes through the butterfly plate 25 and the valve stem 24. The bolt sleeve 42 and the pin 35 are threaded together and fixed.

[0027] It should be noted that the butterfly plate 25 and the valve stem 24 are held between the pressure plate 41 and the self-locking frame 31. Through the cooperation of the pressure plate 41 and the self-locking frame 31, the valve stem 24 and the butterfly plate 25 are fixed between them, while also meeting the requirement that the center of the butterfly plate 25 is offset from the valve stem 24.

[0028] In this embodiment, the three sets of water receiving plates 34 of the self-locking mechanism are evenly distributed on the protruding rod 33 at 120°. The plate surface has an inclination angle with the medium flow direction. When the medium passes through, the water receiving plate 34 is subjected to fluid impact and generates rotational torque, which drives the bolt ring 32 connected to the protruding rod 33 to rotate along the inner cavity of the self-locking frame 31, pushes the inner pin shaft 35 of the screw-in bolt sleeve 42 to rotate, and then presses it in the direction of the butterfly plate 25. The pressing force is positively correlated with the medium flow rate, so as to achieve the effect of locking more as it is flushed.

[0029] It is understandable that the self-locking mechanism moves synchronously with the valve stem 24, and there are three sets of water receiving plates 34. They rotate with the transmission of the medium, and the power for the rotation of the water receiving plates 34 comes from the flushing of the transmission medium.

[0030] To further improve the sealing performance at the junction of the two parts, a sealing element 5 is placed in the gap between the self-locking frame 31 and the bolt ring 32 to prevent the transmitted medium from seeping in through the gap, thus ensuring the sealing performance before and after the spiral self-locking.

[0031] To further improve the stability of the pressure plate 41 on the butterfly plate 25, the pressure plate 41 is provided with several through slots, and the positioning parts 43 that connect to the butterfly plate 25 pass through the through slots.

[0032] In order to reinforce the upper and lower parts of the valve stem 24 to the end face of the butterfly plate 25, the reinforcement mechanism further includes a valve stem sleeve 61 sleeved on the outside of the valve stem 24. The valve stem sleeve 61 has protruding ribs 62 formed at both ends. The ribs 62 and the end face of the butterfly plate 25 are fixed by rib bolts 63.

[0033] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A double eccentric pin shaft anti-drop butterfly valve, characterized in that, Includes a valve body (11), on which an inlet end seat (12) and an outlet end seat (13) are provided along the medium transmission direction; The drive mechanism includes a valve seat (21) installed on the upper part of the valve body (11), a drive device (22) is provided above the valve seat (21), the valve seat (21) and the valve body (11) are connected by a hollow rod sleeve (23), the output end of the drive device (22) is equipped with a valve stem (24) that passes through the rod sleeve (23), and a butterfly plate (25) with a single-sided protrusion is installed on the outside of the valve stem (24); The self-locking mechanism includes a self-locking frame (31) sleeved on the outside of the valve stem (24). A bolt ring (32) is provided in the middle of the self-locking frame (31). One end of the bolt ring (32) that penetrates into the inner cavity of the self-locking frame (31) is connected to a pin (35), and the other end is formed with a protruding convex rod (33). Several water receiving plates (34) are connected to the convex rod (33). The pressure plate mechanism includes a pressure plate (41) that connects to the butterfly plate (25). A bolt sleeve (42) is formed in the middle of the pressure plate (41) that passes through the butterfly plate (25) and the valve stem (24). The bolt sleeve (42) and the pin (35) are threaded together and fixed.

2. The double eccentric pin shaft anti-drop butterfly valve according to claim 1, characterized in that, The butterfly plate (25) and the valve stem (24) are held between the pressure plate (41) and the self-locking frame (31).

3. The double eccentric pin shaft anti-drop butterfly valve according to claim 1, characterized in that, The self-locking mechanism moves synchronously with the valve stem (24), and the water receiving plate (34) is provided in three sets, rotating with the medium transmission.

4. The double eccentric pin shaft anti-drop butterfly valve according to claim 1, characterized in that, A sealing element (5) is placed in the gap between the self-locking frame (31) and the bolt ring (32).

5. The double eccentric pin shaft anti-drop butterfly valve according to claim 1, characterized in that, The pressure plate (41) has several through slots, and a positioning element (43) for connecting the butterfly plate (25) passes through the through slots.

6. The double eccentric pin shaft anti-drop butterfly valve according to claim 1, characterized in that, The reinforcement mechanism includes a valve stem sleeve (61) sleeved on the outside of the valve stem (24). The valve stem sleeve (61) has raised ribs (62) formed at both ends. The ribs (62) and the end faces of the butterfly plate (25) are fixed by rib bolts (63).

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