Core shaft sealing connection structure of dustproof butterfly valve

Abstract

The utility model relates to the technical field of butterfly valves, in particular to a spindle sealing connection structure of a dustproof butterfly valve, which comprises a rotating shaft, a shaft sleeve fixed on a valve body, a driving mechanism mounted on the valve body and used for driving the rotating shaft to rotate, and a spindle body of the rotating shaft penetrates through the shaft sleeve and two ends of the rotating shaft are respectively connected with valve plates. The end, close to the valve plate, of the shaft sleeve is shrunk to integrally form a baffle ring part, a gap is reserved between the baffle ring part and the rotating shaft, and the other end of the shaft sleeve is detachably connected with a pressing ring which is arranged on the rotating shaft in a clearance sleeving mode. The part, located in the shaft sleeve, of a shaft body of the rotating shaft is expanded to form a shoulder column part with the diameter larger than the inner diameter of the baffle ring part. A transition chamfer is arranged between the shoulder column part and the part, close to the baffle ring part, of the rotating shaft body, the transition chamfer is sleeved with an annular sealing packing, the outer wall of the shoulder column part is sleeved with a pressing sleeve in a clearance mode, and the two ends of the pressing sleeve correspondingly abut against the pressing ring and the sealing packing respectively; according to the mandrel sealing connection structure, the sealing effect is improved while the opening and closing flexibility of the butterfly valve is not affected.

Description

Technical Field

[0001] The utility model relates to the technical field of butterfly valves, in particular to a core shaft sealing connection structure of a dustproof butterfly valve. Background Art

[0002] It is well known that in order to prevent the butterfly valve from being stuck in rotation due to the asynchronous expansion and contraction of the valve body and the core shaft when used in a high-temperature environment, the rotation gap between the core shaft and the valve body is generally set to be slightly larger. However, the disadvantage of this setting is that dust flowing through the valve body will enter the rotation gap, and long-term accumulation will also cause the core shaft to be stuck in rotation. The Chinese utility model patent with announcement number CN204828702U discloses a dust-proof butterfly valve for gas, which fills the rotation gap between the valve body and the valve stem with sealing packing to ensure the sealing effect. However, its defects are: first, the filling depth of the sealing packing is too large, and it contacts the valve stem too much. When it is squeezed unevenly, it will affect the rotation flexibility of the valve stem; second, the sealing packing and the valve stem are mainly radially sealed, and the sealing effect is limited. Utility Model Content

[0003] In order to overcome the deficiencies in the background technology and solve the existing technical problems, the utility model discloses a core shaft sealing connection structure of a dustproof butterfly valve, which improves the sealing effect without affecting the opening and closing flexibility of the butterfly valve.

[0004] In order to achieve the above-mentioned purpose of the invention, the present invention adopts the following technical solutions:

[0005] A core shaft sealing connection structure of a dustproof butterfly valve comprises a rotating shaft and a sleeve fixed to the valve body, the rotating shaft body passes through the sleeve, and both ends of the rotating shaft are respectively connected to a valve plate, and a driving mechanism installed on the valve body and used to drive the rotating shaft to rotate; the sleeve is reduced in diameter at one end close to the valve plate to form a retaining ring portion with a gap between it and the rotating shaft, and the other end of the sleeve is detachably connected to a pressure ring which is sleeved on the rotating shaft with a gap, and the rotating shaft body located in the sleeve is expanded in diameter to form a shoulder column portion with a diameter larger than the inner diameter of the retaining ring portion, a transition chamfer is provided between the shoulder column portion and the rotating shaft body close to the retaining ring portion, an annular sealing packing is sheathed at the transition chamfer, a pressure sleeve is provided in the gap on the outer wall of the shoulder column portion, and the two ends of the pressure sleeve are respectively in contact with the pressure ring and the sealing packing.

[0006] Furthermore, the end surface of the pressure ring is evenly distributed with a plurality of connection holes, and the corresponding end surface of the shaft sleeve is provided with threaded holes for passing bolts and connecting corresponding to the connection holes.

[0007] Furthermore, a sealing ring gasket is provided between the pressure ring and the corresponding end surface of the sleeve, the gasket surface of the sealing ring gasket is provided with a through hole for the corresponding bolt to pass through, and the inner ring surface of the sealing ring gasket contacts and seals with the outer wall of the shoulder column portion.

[0008] Furthermore, the sealing packing is configured as oil-impregnated asbestos packing.

[0009] Furthermore, a sleeve is fixed at the center of the end of the valve plate, the corresponding end of the rotating shaft is adapted to be inserted into the sleeve, and the rotating shaft and the sleeve are fixedly connected by a radially detachable pin.

[0010] Furthermore, the outer wall of the press sleeve is interference fit with the inner wall of the shaft sleeve, and a ring groove is provided in the middle of the inner wall of the press sleeve. A plurality of annular spring pieces are provided in the annular groove and are sleeved on the shoulder column. The outer ring of the annular spring piece is integrally connected with the press sleeve, and the inner ring of the annular spring piece is transitionally fitted with the shoulder column.

[0011] Due to the adoption of the above-mentioned technical solution, the utility model has the following beneficial effects:

[0012] The core shaft sealing connection structure of the dust-proof butterfly valve disclosed by the utility model forms a bending cavity between the end of the shaft sleeve and the end of the shoulder column of the rotating shaft by arranging a retaining ring portion and a transition chamfer, so that the sealing packing can be installed and extruded by using the pressure ring and the pressure sleeve, so that the sealing packing can be stuck in the bending cavity, forming radial and axial seals on the rotating shaft, greatly improving the sealing effect, and at the same time the sealing packing can also maintain a small contact with the rotating shaft, and the extrusion is relatively uniform, so that the rotation of the rotating shaft will not be excessively affected, thereby ensuring the flexibility of opening and closing of the butterfly valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a partial cross-sectional schematic diagram of the implementation structure of the utility model;

[0014] Figure 2 It is an enlarged schematic diagram of the cooperation between the pressing sleeve and the rotating shaft.

[0015] In the figure: 1. valve body; 2. rotating shaft; 201. shoulder column; 202. transition chamfer; 3. shaft sleeve; 301. retaining ring; 4. pressing ring; 5. pressing sleeve; 501. annular spring; 6. sealing packing; 7. sealing ring gasket; 8. insert sleeve. DETAILED DESCRIPTION

[0016] The technical solution of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" and the like indicating directions or positional relationships, these are merely corresponding to the drawings of the present invention and are for the convenience of describing the present invention. They do not indicate or imply that the devices or components referred to must have a specific direction. Example 1:

[0017] Combined with attachment Figure 1The core shaft sealing connection structure of the dustproof butterfly valve comprises a rotating shaft 2 and a sleeve 3 fixed to the valve body 1, the shaft body of the rotating shaft 2 passes through the sleeve 3, and the two ends of the rotating shaft 2 are respectively connected to the valve plate, and a driving mechanism installed on the valve body 1 and used to drive the rotating shaft 2 to rotate, and the driving mechanism can be manually driven or automatically driven; according to needs, a sleeve 8 is fixed to the center of the end of the valve plate, and the corresponding end of the rotating shaft 2 is adapted to be inserted into the sleeve 8, and the rotating shaft 2 and the sleeve 8 are fixedly connected by a radially detachable pin shaft, specifically, the side walls of the rotating shaft 2 and the sleeve 8 are provided with pin holes corresponding to the pin shafts for insertion, which ensures a stable connection while also facilitating disassembly and assembly;

[0018] The end of the sleeve 3 close to the valve plate is reduced in diameter to form a retaining ring portion 301 with a gap between it and the rotating shaft 2. The other end of the sleeve 3 is detachably connected to a pressure ring 4 that is sleeved on the rotating shaft 2 with a gap. The pressure ring 4 and the retaining ring portion 301 together form an extrusion limiter; according to needs, the end surface of the pressure ring 4 is evenly distributed with a plurality of connecting holes, and the corresponding connecting holes of the corresponding end surfaces of the sleeve 3 are provided with threaded holes for passing bolts. The bolt connection of the pressure ring 4 ensures a stable connection and is easy to disassemble and assemble; in addition, a sealing ring gasket 7 is provided between the corresponding end surfaces of the pressure ring 4 and the sleeve 3, and the gasket surface of the sealing ring gasket 7 is provided with a through-hole corresponding to the bolt passing through. The inner annular surface of the sealing ring gasket 7 contacts and seals with the outer wall of the shoulder column portion 201, and the sealing ring gasket 7 can retain a certain extrusion elasticity, and a seal can also be formed between the sealing ring gasket 7 and the shoulder column portion 201 after extrusion to prevent external oil or dust from entering;

[0019] The shaft body of the rotating shaft 2 located in the shaft sleeve 3 is expanded to form a shoulder column portion 201 with a diameter larger than the inner diameter of the retaining ring portion 301. A transition chamfer 202 is provided between the shoulder column portion 201 and the shaft body of the rotating shaft 2 close to the retaining ring portion 301, so that a smaller bending cavity is formed between the end of the shaft sleeve 3 and the end of the shoulder column portion 201. An annular sealing packing 6 is sheathed at the transition chamfer 202. Specifically, the sealing packing 6 can be set as an oil-immersed asbestos packing with better lubrication and sealing effects. A pressing sleeve 5 is provided in the gap of the outer wall of the shoulder column portion 201 to ensure that the pressing sleeve 5 does not affect the rotation of the shoulder column portion 201. The two ends of the pressing sleeve 5 respectively conflict with the pressing ring 4 and the sealing packing 6 to ensure that the sealing packing 6 can be squeezed.

[0020] The core shaft sealing connection structure of the dust-proof butterfly valve of the present invention is implemented. After the pressure ring 4 is installed and fixed to the end face of the sleeve 3 by bolt connection, the pressure ring 4 squeezes the pressure sleeve 5, so that the pressure sleeve 5 presses the sealing packing 6 into the bending cavity formed at the transition chamfer 202, and forms a radial seal and an axial seal on the rotating shaft 2, which greatly improves the sealing effect. At the same time, the sealing packing 6 can also maintain a small contact with the rotating shaft 2, and the squeezing is relatively uniform, ensuring the flexibility of the rotation of the rotating shaft 2. Example 2:

[0021] like Figure 2As shown, on the basis of Example 1, an interference fit is set between the outer wall of the pressing sleeve 5 and the inner wall of the shaft sleeve 3, and an annular groove is provided in the middle of the inner wall of the pressing sleeve 5. A plurality of annular spring pieces 501 are provided in the annular groove and are sleeved on the shoulder column portion 201. The outer ring of the annular spring piece 501 is integrally connected with the pressing sleeve 5, and the inner ring of the annular spring piece 501 is transitionally fitted with the shoulder column portion 201. Through the elastic resistance of the plurality of annular spring pieces 501 to the shoulder column portion 201, the butterfly valve can maintain a good dust containment and blocking effect when it expands and contracts due to heat or the sealing packing 6 is damaged.

[0022] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the above-mentioned embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure marks in the claims should not be regarded as limiting the content of the claims involved.

Claims

1. A core shaft sealing connection structure of a dustproof butterfly valve, comprising a rotating shaft (2) and a shaft sleeve (3) fixed to a valve body (1), wherein the shaft body of the rotating shaft (2) passes through the shaft sleeve (3), and both ends of the rotating shaft (2) are respectively connected to valve plates, and a driving mechanism installed on the valve body (1) and used to drive the rotating shaft (2) to rotate, wherein the characteristics are: The end of the sleeve (3) close to the valve plate is reduced in diameter to form a retaining ring portion (301) with a gap between the sleeve and the rotating shaft (2). The other end of the sleeve (3) is detachably connected to a pressure ring (4) with a gap sleeved on the rotating shaft (2). The shaft body of the rotating shaft (2) located in the sleeve (3) is expanded to form a shoulder column portion (201) with a diameter larger than the inner diameter of the retaining ring portion (301). A transition chamfer (202) is provided between the shoulder column portion (201) and the shaft body of the rotating shaft (2) close to the retaining ring portion (301). An annular sealing packing (6) is provided on the transition chamfer (202). A press sleeve (5) is provided on the outer wall of the shoulder column portion (201). The two ends of the press sleeve (5) respectively contact the pressure ring (4) and the sealing packing (6).

2. The core shaft sealing connection structure of the dustproof butterfly valve according to claim 1 is characterized in that: The end surface of the pressure ring (4) is evenly distributed with a plurality of connection holes, and the corresponding end surface of the shaft sleeve (3) is provided with threaded holes for passing bolts and connecting corresponding to the connection holes.

3. The core shaft sealing connection structure of the dustproof butterfly valve according to claim 2 is characterized in that: A sealing ring gasket (7) is provided between the corresponding end faces of the pressure ring (4) and the shaft sleeve (3); a gasket surface of the sealing ring gasket (7) is provided with a through hole through which the corresponding bolt passes; and an inner ring surface of the sealing ring gasket (7) contacts and seals the outer wall of the shoulder column portion (201) in a corresponding manner.

4. The core shaft sealing connection structure of the dustproof butterfly valve according to claim 1 is characterized in that: The sealing packing (6) is configured as an oil-impregnated asbestos packing.

5. The core shaft sealing connection structure of the dustproof butterfly valve according to claim 1 is characterized in that: A sleeve (8) is fixed at the center of the end of the valve plate, and the corresponding end of the rotating shaft (2) is adapted to be inserted into the sleeve (8), and the rotating shaft (2) and the sleeve (8) are fixedly connected via a radially detachable pin.

6. The core shaft sealing connection structure of the dustproof butterfly valve according to claim 1 is characterized by: The outer wall of the pressing sleeve (5) is interference-fitted with the inner wall of the shaft sleeve (3); a ring groove is provided in the middle of the inner wall of the pressing sleeve (5); a plurality of annular spring pieces (501) are provided in the ring groove and are sleeved on the shoulder column portion (201); the outer ring of the annular spring piece (501) is integrally connected to the pressing sleeve (5); and the inner ring of the annular spring piece (501) is transitionally fitted with the shoulder column portion (201).

Images