Combined sealing device for a hybrid reactor

Abstract

The application provides a combined sealing device for a mixed reactor, which comprises a first sealing seat fixed to an equipment end plate, a bevel groove being arranged on the first sealing seat near an inner hole of a material side, a flushing water channel being arranged in the first sealing seat, a ring groove being arranged on an inner diameter of the first sealing seat and a hole ring being arranged in the ring groove; a second sealing seat being in sealing connection with the first sealing seat, a ring groove being arranged on an inner diameter of the second sealing seat and a reverse double-lip sealing ring being arranged in the ring groove; and a stuffing box being in connection with the second sealing seat, a stuffing being arranged in the stuffing box and a shaft sleeve being arranged on a sealing contact surface of the stuffing. The combined sealing device has reasonable and reliable structure and is simple to install and maintain, and solves the problem that the stuffing sealing structure of the mixed reactor equipment is easy to cause PC powder carbonization and affect product quality.

Description

Technical Field

[0001] This invention relates to the field of reactor sealing structure technology, and more particularly to a combined sealing device for use in a mixing reactor. Background Technology

[0002] In recent years, due to the simple structure, low cost and stable operation of the mixing reactor equipment, it has been widely used in the field of bisphenol A to PC powder production.

[0003] Mixed reactors typically employ a packed-seal structure. To ensure stable operation, a certain gap must be designed between the end plate of the equipment and the end face of the stirring shaft tube. To minimize the "dead zone" caused by this gap, the gap is designed to be sufficiently small, generally 2-4 mm. During the high-speed rotation of the stirring shaft, PC powder cannot flow normally within the small gap. Under the combined effects of rotational extrusion and high temperature, the PC powder carbonizes, forming a ring-shaped "black material" that flows to the next reaction stage, affecting the quality of the finished product. Summary of the Invention

[0004] To address the shortcomings of the existing technology, this invention provides a combined sealing device for use in a mixing reactor. This combined sealing device has a reasonable and reliable structure, is easy to install and maintain, and solves the problem that the packing sealing structure of the mixing reactor equipment is prone to carbonization of PC powder, which affects product quality.

[0005] To achieve the above objectives, the present invention provides a combined sealing device for a mixing reactor, the combined sealing device comprising:

[0006] The first sealing seat is fixed to an end plate of a device. The first sealing seat has a sloping opening near the inner hole on the material side. The first sealing seat has a flushing water channel inside. The inner diameter of the first sealing seat has an annular groove and a perforated ring is installed.

[0007] The second sealing seat is sealed to the first sealing seat. The inner diameter of the second sealing seat is provided with an annular groove and a reverse double-lip sealing ring is installed.

[0008] A stuffing box is connected to the second sealing seat. The stuffing box contains packing material, and the sealing contact surface of the packing material is a bushing.

[0009] In some embodiments, the combined sealing device further includes a stirring shaft tube, the end face of which is flush with the mating surface of the second sealing seat and the stuffing box.

[0010] In some embodiments, the bushing is positioned by a precision-machined annular groove on the outer end face of the stirring shaft tube, and the other end face of the bushing is fixed by a nut.

[0011] In some embodiments, the mating surfaces of the bushing and the stirring shaft tube, the mating surfaces of the first and second sealing seats, and the mating surfaces of the stuffing box and the second sealing seat are respectively sealed by the O-rings.

[0012] In some embodiments, the sealing surfaces of the perforated ring and the reverse double-lip sealing ring are the outer wall surface of the stirring shaft tube.

[0013] In some embodiments, the inner and outer diameters of the hole ring are designed with circumferential grooves of depth, and multiple through holes are evenly distributed radially.

[0014] In some embodiments, the packing is compressed by a packing gland.

[0015] In some embodiments, the second sealing seat is located between the first sealing seat and the stuffing box.

[0016] In some embodiments, the bevel angle of the first sealing seat is greater than the material repose angle.

[0017] In some embodiments, the reverse double-lip sealing ring has a split structure.

[0018] Compared with the prior art, the advantages of the technical solution of the present invention are as follows:

[0019] This invention provides a combined sealing device for use in a mixing reactor, particularly suitable for sealing structures of bisphenol A-based polycarbonate (PC) powder. This combined sealing device eliminates the gap between the stirring shaft end and the equipment end plate by moving the stirring shaft end outward, thus preventing the PC powder from being squeezed in this gap to form "black material" and affecting the quality of the finished product.

[0020] The combined sealing device provided by this invention is a combination of water ring seal, reverse double lip seal structure and packing seal. The water ring seal is the first layer of protection. The reverse double lip seal structure and the packing seal structure are tightly attached to the outer wall of the shaft in the circumferential direction and can withstand pressure of more than 0.5MPa. They are important guarantees for the formation of water ring seal. The packing seal is located on the outermost side. It is easy to install and maintain, highly practical and can guarantee zero leakage.

[0021] The combined sealing device provided by this invention has a beveled opening at the inner diameter of the first sealing seat, which, in conjunction with a water ring seal, reduces the tendency of material to flow outward, effectively relieves the pressure on the sealing assembly, and ensures the long-term effective operation of the sealing assembly. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the combined sealing device used in a mixing reactor according to an embodiment of the present invention;

[0024] Figure 2 This is a cross-sectional view of the reverse double-lip sealing ring shown in an embodiment of the present invention;

[0025] in:

[0026] 1-First sealing seat;

[0027] 2-Equipment end plate;

[0028] 3-hole ring;

[0029] 4-Second sealing seat;

[0030] 5-Reverse double-lip sealing ring;

[0031] 51 - Outer metal frame;

[0032] 52-Non-metallic reverse double lip;

[0033] 53-Sealing profile;

[0034] 6-Stuffing gland;

[0035] 7-Packaging;

[0036] 71-Packaging gland;

[0037] 8-Sleeve;

[0038] 81-Stellite alloy;

[0039] 9-Stirring shaft tube;

[0040] 91-blade;

[0041] 10 - "O" rings;

[0042] A - Material side. Detailed Implementation

[0043] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments to further understand the purpose, solution and effect of the present invention, but it is not intended to limit the scope of protection of the appended claims.

[0044] Certain terms are used in this specification and the following claims to refer to specific components or parts. Those skilled in the art will understand that users or manufacturers may use different names or terms to refer to the same component or part. This specification and the following claims do not distinguish components or parts by differences in name, but rather by differences in function. The terms "comprising" and "including" used throughout this specification and the following claims are open-ended and should be interpreted as "including but not limited to". Furthermore, the term "connection" here includes any direct and indirect electrical connection means. Indirect electrical connection means include connections made through other means.

[0045] It should be noted that in the description of this invention, the terms "lateral", "longitudinal", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and "about", or "approximately", "substantially", "left and right", etc., indicating the orientation or positional relationship or parameters, are all based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, a specific size, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0046] See Figure 1 This invention provides a combined sealing device for a mixing reactor, comprising: a first sealing seat 1 fixed to an end plate 2 of a device, the first sealing seat 1 having a beveled opening near the inner hole of the material side A, the first sealing seat 1 having a flushing water channel inside, and the inner diameter of the first sealing seat 1 having an annular groove and a perforated ring 3 installed thereon; a second sealing seat 4 sealingly connected to the first sealing seat 1, the inner diameter of the second sealing seat 4 having an annular groove and a reverse double-lip sealing ring 5 installed thereon; and a stuffing box 6 connected to the second sealing seat 4, the stuffing box 6 having packing 7 installed inside, the sealing contact surface of the packing 7 being a bushing 8.

[0047] The second sealing seat and the first sealing seat are connected by bolts, and the stuffing box 6 and the second sealing seat 4 are connected by bolts.

[0048] The combined sealing device further includes a stirring shaft tube 9, the end face of which is flush with the mating surface of the second sealing seat 4 and the stuffing box 6, and the end face of the stuffing box 6 near the stirring shaft tube 9 is subjected to an inward cutting process.

[0049] The bushing 8 is positioned by a precision-machined annular groove on the outer end face of the stirring shaft tube 9, and the other end face of the bushing 8 is fixed by a nut.

[0050] The mating surfaces of the bushing 8 and the stirring shaft tube 9, the mating surfaces of the first sealing seat 1 and the second sealing seat 4, and the mating surfaces of the stuffing box 6 and the second sealing seat 4 are respectively sealed by the O-ring 10.

[0051] The sealing surfaces of the perforated ring 3 and the reverse double-lip sealing ring 5 are the outer wall surfaces of the stirring shaft tube 9, and Stellite alloy 81 is overlaid on the sealing surfaces of the stirring shaft tube 9.

[0052] The annular ring 3 features circumferential grooves on both its inner and outer diameters, and multiple radially distributed through holes. The packing 7 is secured by a packing gland 71. The second sealing seat 4 is positioned between the first sealing seat 1 and the stuffing box 6. The bevel angle of the first sealing seat 1 is greater than the material repose angle. The reverse double-lip sealing ring 5 adopts a split structure for easy installation and maintenance.

[0053] Specifically, the combined sealing device for a mixing reactor provided by this invention includes an end plate and a first sealing seat connected to the end plate. The concentricity of the sealing seat's radial direction with the stirring shaft is ensured by welding followed by precision machining. A flow channel is provided inside the first sealing seat, with its inlet connected to a water inlet pipe. A perforated ring is installed in the inner annular groove of the first sealing seat. The perforated ring has radially distributed through holes, and a certain depth of annular groove is designed circumferentially on both the inner and outer diameters. The annular groove communicates with the through holes, ensuring that the flushing water forms a water ring under a certain working pressure, isolating the internal material. A slope greater than 45° is opened at the inner hole of the first sealing seat near the material side to increase the material's flowability and ensure that the material is not squeezed by the end face. The non-material side of the first sealing seat is bolted to a second sealing seat. The mating surfaces of the first and second sealing seats are sealed with O-rings to prevent flushing water or material from flowing out. A reverse double-lip sealing ring is installed in the inner annular groove of the second sealing seat. The reverse double-lip sealing ring consists of a metal skeleton and a reverse double lip made of modified polytetrafluoroethylene material. The structure is composed of modified polytetrafluoroethylene (PTFE) with high hardness. Generally, the surface roughness Ra of the outer wall of the stirring shaft tube is required to be ≤0.4μm, surface hardness 45~65HRC, and radial runout ≤0.4mm. Therefore, the contact area between the stirring shaft tube and the reverse double-lip seal ring is welded with Stellite alloy and then precision machined to ensure that its hardness, roughness, and radial runout meet the installation requirements of the reverse double-lip seal. The other end of the second sealing seat is bolted to the stuffing box, and the mating surface is sealed with an O-ring. After the reverse double-lip seal ring is installed, the distance from this mating surface is 0.2~1mm. The stuffing box generally houses 20×20 aramid filler. The working contact surface with the filler is the outer surface of the bushing fitted into the stirring shaft. The outer surface of the bushing is welded with Stellite alloy. One end face of the bushing is positioned by a precision-machined annular groove on the end face of the stirring shaft tube, sealed with an O-ring. The other end face of the bushing is axially positioned by a round nut and circumferentially positioned by a key.

[0054] In this embodiment, the gap between the blades on the stirring shaft tube and the end plate of the equipment can be adjusted according to the material. For PC material, the general design value is no more than 10mm. The inner hole of the first sealing seat has a bevel greater than 45°, and the design requires that this angle be at least greater than the material's angle of repose. The reverse double-lip sealing ring can adopt a split structure for easy installation, disassembly, and maintenance. The gap between the inner diameter of the first sealing seat, the inner diameter of the second sealing seat, and the outer diameter of the stirring shaft tube is 1-2mm. The end face of the stirring shaft tube is flush with the mating surface of the second sealing seat and the stuffing box. The end face of the stuffing box, near the end face of the stirring shaft tube, is internally concave to avoid dynamic and static friction with the stirring shaft tube.

[0055] In this embodiment, the first sealing seat is welded to the end plate of the equipment. The inner side of the first sealing seat is in contact with the material, and the inner hole has a bevel greater than 45°, which is at least greater than the angle of repose of the material. The first sealing seat has a flow channel inside, and a water inlet pipe is connected to the inlet of the flow channel. The first sealing seat has an inner annular groove, and a perforated ring is installed in the annular groove. The flushing water enters the flow channel of the first sealing seat through the water inlet pipe. Under a certain working pressure, a water ring is formed at the inner annular groove of the perforated ring, which, together with the bevel of the first sealing seat, can block most of the overflowing material.

[0056] like Figure 2 As shown, the reverse double-lip sealing ring 5 has a split structure, with an outer ring of metal skeleton 51 and an inner ring of non-metallic reverse double lip 52. After the reverse double-lip sealing ring 5 is fixed in the annular groove of the second sealing seat, it is inserted into the stirring shaft tube using a special tool. The non-metallic reverse double lip 52 is tightly attached to the outer wall of the stirring shaft tube. The non-metallic reverse double lip 52 is made of specially modified polytetrafluoroethylene, which has the characteristics of high hardness, excellent toughness and strong self-lubrication. During the rotation of the stirring shaft tube, the non-metallic reverse double lip 52 is tightly attached to one side of the outer wall of the stirring shaft tube, with evenly distributed sealing profiles 53. The non-metallic material is tightly attached to the rotating shaft and self-adjusted by friction, forming a multi-segment annular seal. This not only enhances the sealing reliability but also ensures the sealing of flushing water relative to the outside, ensuring that the annular groove inside the hole ring forms a stable water ring seal.

[0057] Furthermore, the stuffing box is connected to the second sealing seat by bolts, and the mating surface is sealed with an O-ring. To prevent dynamic and static friction between the end face of the agitator shaft tube and the end face of the stuffing box during rotation, the possible contact points between the end face of the stuffing box and the end face of the agitator shaft tube are internally recessed. Square packing is installed inside the stuffing box, and the tightness is adjusted by the packing gland. The packing slides against the outer wall of the shaft sleeve to form the final packing seal.

[0058] One end face of the bushing is precision-machined with an annular groove to position it against the outer end face of the agitator shaft tube, and sealed with an O-ring. The other end face is fixed with a round nut. The bushing rotates with the agitator shaft, and its outer surface slides and rubs against the packing to form a packing seal surface. To ensure the service life of the bushing, Stellite alloy is overlaid on its surface.

[0059] In summary, the combined sealing device provided in this embodiment consists of three sealing structures: the first is a water ring seal formed by the inner annular groove of the perforated ring; the second is a multi-segment annular seal formed by the action of a reverse double-lip sealing ring; and the third is a packing seal formed by the packing material. This invention moves the position of the stirring shaft tube outward, eliminating the gap between the shaft tube end face and the inner wall of the equipment end face, preventing internal materials from being squeezed in this gap and forming "black material" that affects material quality. Using three seals ensures zero leakage.

[0060] The combined sealing device for a mixing reactor provided in this embodiment includes: a first sealing seat fixed to the end plate of the equipment, the first sealing seat having an inclined bevel on the inner diameter near the material side, an internal flushing water channel, and an inner ring groove for installing a perforated ring, forming a first water ring seal; a second sealing seat connected to the first sealing seat by bolts, the mating surface being sealed by an "O" ring, and an internal ring groove for installing a reverse double-lip sealing ring, forming a second multi-segment annular seal; a stuffing box connected to the second sealing seat by bolts, the mating surface being sealed by an "O" ring, and aramid packing installed inside, contacting the shaft sleeve to form a third packing seal; the contact surfaces of the first water ring seal and the second multi-segment annular seal are both the outer wall of the stirring shaft tube, with Stellite alloy welded to the contact position to enhance hardness and ensure service life, and the contact surface of the third packing seal is the shaft sleeve, with Stellite alloy welded to the surface of the shaft sleeve.

[0061] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A combined sealing device for use in a mixing reactor, characterized in that: The combined sealing device includes: The first sealing seat is fixed to an end plate of a device. The first sealing seat has a sloping opening near the inner hole on the material side. The first sealing seat has a flushing water channel inside. The inner diameter of the first sealing seat has an annular groove and a perforated ring is installed. The second sealing seat is sealed to the first sealing seat. The inner diameter of the second sealing seat is provided with an annular groove and a reverse double-lip sealing ring is installed. A stuffing box is connected to the second sealing seat. The stuffing box contains packing material, and the sealing contact surface of the packing material is a bushing. The combined sealing device further includes a stirring shaft tube, the end face of which is flush with the mating surface of the second sealing seat and the stuffing box; The mating surfaces of the bushing and the stirring shaft tube, the mating surfaces of the first and second sealing seats, and the mating surfaces of the stuffing box and the second sealing seat are respectively sealed by the "O" rings; The sealing surfaces of the perforated ring and the reverse double-lip sealing ring are the outer wall surfaces of the stirring shaft tube; The reverse double-lip sealing ring adopts a split structure.

2. The combined sealing device for a mixing reactor according to claim 1, characterized in that: The bushing is positioned by a precision-machined annular groove on the outer end face of the stirring shaft tube, and the other end face of the bushing is fixed by a nut.

3. The combined sealing device for a mixing reactor according to claim 1, characterized in that: The inner and outer diameters of the hole ring are designed with circumferential grooves of depth, and multiple through holes are evenly distributed radially.

4. The combined sealing device for a mixing reactor according to claim 1, characterized in that: The packing is compressed by a packing gland.

5. The combined sealing device for a mixing reactor according to claim 1, characterized in that: The second sealing seat is located between the first sealing seat and the stuffing box.

6. The combined sealing device for a mixing reactor according to claim 1, characterized in that: The bevel angle of the first sealing seat is greater than the material repose angle.

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