Rotary shaft sealing structure of fluidized bed reactor

Abstract

A rotating shaft sealing structure for a fluidized bed reactor includes a shaft body and a magnetic coupling unit. The shaft body includes a driving shaft and a driven shaft. A driven shaft sleeve is fitted onto the driven shaft. The magnetic coupling unit includes an inner magnetic rotor, an outer magnetic rotor, and a sealing isolation sleeve. The inner magnetic rotor is connected to the driven shaft. The outer magnetic rotor is connected to the driving shaft. The sealing isolation sleeve is disposed between the inner and outer magnetic rotors, enclosing the inner magnetic rotor within it, and providing a static seal with the driven shaft sleeve. A purge hole is provided on the driven shaft sleeve. This invention effectively solves the problem of easy leakage in the original rotating shaft dynamic seal, greatly improves the sealing reliability of the rotating shaft, avoids powder leakage into the shaft gap causing the rotating shaft to jam, and prevents dangerous gases from leaking to the outside, greatly improving equipment safety and service life.

Description

Technical Field

[0001] This utility model relates to fluidized bed reactor equipment, and in particular to a rotating shaft sealing structure for a fluidized bed reactor. Background Technology

[0002] The rotating shaft seal of conventional fluidized bed reactor equipment (such as FB-CVD) is a dynamic seal, which has the following disadvantages: (1) When the rotating shaft is working, there is mutual movement between the rotating shaft and the seal. Even if the seal is tightly fitted with the rotating shaft, its sealing performance is still unreliable and zero leakage cannot be achieved; (2) There is mutual friction between the rotating shaft and the seal. The seal is easy to wear and has a short service life; (3) The powder at the bottom of the reaction chamber is easy to leak into the gap between the rotating shaft and the bushing, which can cause the rotating shaft to jam and be damaged; (4) Because the rotating shaft seal is a dynamic seal, the medium in the reaction chamber is easy to leak to the outside, which can cause the bottom rotating shaft to jam and dangerous gas to leak. Utility Model Content

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings of the prior art and provide a rotary shaft sealing structure for a fluidized bed reactor with high sealing reliability and long service life.

[0004] The technical solution of this utility model is: a rotating shaft sealing structure for a fluidized bed reactor, comprising a shaft body and a magnetic coupling unit; the shaft body includes a driving shaft and a driven shaft; a driven shaft sleeve is fitted on the driven shaft; the magnetic coupling unit includes an inner magnetic rotor, an outer magnetic rotor, and a sealing isolation sleeve; the inner magnetic rotor is connected to the driven shaft; the outer magnetic rotor is connected to the driving shaft; the sealing isolation sleeve is disposed between the inner magnetic rotor and the outer magnetic rotor, surrounding the inner magnetic rotor inside it, and providing a static seal with the driven shaft sleeve; a purge hole is provided on the driven shaft sleeve.

[0005] Furthermore, the inner magnetic rotor and the outer magnetic rotor are linked by magnetic coupling to transmit torque.

[0006] Furthermore, the end face of the sealing isolation sleeve is fixedly connected to the end face of the driven shaft sleeve, and a sealing ring is provided between the two.

[0007] Furthermore, the purge hole is opened on the end face of the driven bushing, and the purge hole is connected to the gap between the driven shaft and the driven bushing.

[0008] Furthermore, the driven bushing is also connected to a purge pipe, one end of which is used to connect to an external positive pressure gas source, and the other end is connected to the purge hole; positive pressure gas is introduced into the gap between the driven shaft and the driven bushing through the purge hole.

[0009] Furthermore, the upper end of the driven shaft extends into the reaction chamber, and the lower end is connected to the inner magnetic rotor; the upper end of the driving shaft is connected to the outer magnetic rotor, and the lower end is connected to the drive unit.

[0010] Furthermore, the magnetic coupling unit is disposed inside the cover, and the cover is connected to the lower end face of the driven bushing.

[0011] Furthermore, a gap is provided between the inner surface of the sealing isolation sleeve and the inner magnetic rotor; a gap is provided between the outer surface of the sealing isolation sleeve and the outer magnetic rotor.

[0012] Furthermore, the inner magnetic rotor and / or the outer magnetic rotor are integrally formed annular permanent magnets; or the inner magnetic rotor and / or the outer magnetic rotor include a non-magnetic substrate, on the surface of which magnetic strips are arranged circumferentially.

[0013] Furthermore, the sealing sleeve is made of a non-magnetic material.

[0014] The beneficial effects of this utility model are: (1) By improving the original rotating shaft at the bottom of the fluidized bed reactor into two sections and adding a magnetic coupling unit, the sealing isolation sleeve is connected and fixed with the driven shaft sleeve, thereby converting the original dynamic seal into a static seal. This effectively solves the problem of easy leakage of the original rotating shaft dynamic seal, greatly improves the reliability of the rotating shaft seal, achieves zero leakage, and prevents dangerous gases from leaking to the outside, thereby greatly improving the safety and service life of the equipment. (2) By opening a purge hole on the end face of the driven shaft sleeve, compared with opening it on the rotating shaft, the structure is not only simplified, but the gap between the driven shaft and its shaft sleeve is kept under positive pressure, which effectively prevents the material in the reaction chamber from leaking into the shaft gap and causing the rotating shaft to jam. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model; Figure 2 yes Figure 1 The diagram shows an enlarged view of the magnetic coupling unit in the embodiment shown.

[0016] Explanation of reference numerals in the attached diagram: 1. Driven shaft; 2. Driven shaft; 3. Driven shaft sleeve; 4. Inner magnetic rotor; 5. Outer magnetic rotor; 6. Sealing isolation sleeve; 7. Reaction chamber; 8. O-ring seal; 9. Cover; 10. Purge pipe; 31. Purge hole; 41. Groove; 42. First shaft hole; 51. Second shaft hole; 61. Flanged edge. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] like Figure 1 and Figure 2 As shown: A rotating shaft sealing structure for a fluidized bed reactor includes a shaft body and a magnetic coupling unit; the shaft body includes a driving shaft 1 and a driven shaft 2; a driven shaft sleeve 3 is fitted on the driven shaft 2; the magnetic coupling unit includes an inner magnetic rotor 4, an outer magnetic rotor 5 and a sealing isolation sleeve 6; the inner magnetic rotor 4 is connected to the driven shaft 2; the outer magnetic rotor 5 is connected to the driving shaft 1; the sealing isolation sleeve 6 is located between the inner magnetic rotor 4 and the outer magnetic rotor 5, surrounding the inner magnetic rotor 4 inside it, and providing a static seal between it and the driven shaft sleeve 3; a purge hole 31 is provided on the driven shaft sleeve 3.

[0019] This embodiment transforms the original single rotating shaft at the bottom of the fluidized bed reactor into two sections: a driving shaft 1 and a driven shaft 2. This facilitates the connection of a magnetic coupling unit, thus completely eliminating the dynamic sealing required for a traditional single rotating shaft. By setting up a magnetic coupling unit, the dynamic sealing structure of the rotating shaft can be transformed into a static sealing structure. That is, the inner magnetic rotor 4 and the outer magnetic rotor 5 are linked by magnetic coupling to transmit torque. Only a static seal needs to be achieved between the sealing isolation sleeve 6 and the driven shaft sleeve 3, which fundamentally solves the problems of powder leakage and wear at the dynamic sealing gap of the rotating shaft at the bottom of the fluidized bed reactor. By setting a purge hole 31 on the driven shaft sleeve 3, positive pressure can be maintained in the gap between the driven shaft and its sleeve, preventing material in the reaction chamber 7 from entering the gap between the driven shaft 2 and the driven shaft sleeve 3, thereby preventing the rotating shaft from jamming and being damaged.

[0020] In this embodiment, the fluidized bed reactor is preferably an FB-CVD fluidized bed reactor. The upper end of the driven shaft 2 extends into the reaction chamber 7, and the lower end is connected to the inner magnetic rotor 4; the upper end of the drive shaft 1 is connected to the outer magnetic rotor 5, and the lower end is connected to the drive unit. Since the structure of the rotating shaft extending into the reaction chamber and the structure of the rotating shaft connecting to the drive unit are existing technologies, they will not be described in detail here. This embodiment mainly describes the sealing structure in detail.

[0021] Specifically, in this embodiment, the lower end face of the inner magnetic rotor 4 is provided with an upward groove 41, and the center of the upper end face is provided with a first shaft hole 42 that is adapted to the lower end structure of the driven shaft; wherein the groove 41 provides an installation channel for the bolt, so that the bolt can pass through the groove 41 from the lower end face of the inner magnetic rotor 4 and connect with the driven shaft 2 to achieve the fixation of the inner magnetic rotor and the driven shaft.

[0022] In this embodiment, the lower end of the outer magnetic rotor 5 extends downward to form a second shaft hole 51 that is adapted to the upper end structure of the drive shaft. At least one through hole is provided on the edge of the second shaft hole 51, and bolts pass through the connecting hole to fasten the outer magnetic rotor to the drive shaft.

[0023] In this embodiment, the sealing isolation sleeve 6 has a cylindrical structure with an open top. Flanges 61 extend outwards from the circumference of the open top, forming an upper end face. The inner magnetic rotor 4 is located within the cavity of the sealing isolation sleeve 6 and is enclosed by it. The outer magnetic rotor 5 encloses the portion of the sealing isolation sleeve 6 except for the upper end face. That is, the inner magnetic rotor 4 and the sealing isolation sleeve 6 are concentrically fitted inside the outer magnetic rotor 5, with a gap between the inner surface of the sealing isolation sleeve 6 and the inner magnetic rotor 4, and a gap between the outer surface of the sealing isolation sleeve 6 and the outer magnetic rotor 5.

[0024] In this embodiment, the inner magnetic rotor 4 and the outer magnetic rotor 5 are integrally formed annular permanent magnets; alternatively, the inner and outer magnetic rotors include a non-magnetic substrate with magnetic strips arranged circumferentially on its surface, the magnetic strips of the inner magnetic rotor corresponding to those of the outer magnetic rotor. The sealing isolation sleeve 6 is made of a non-magnetic material to isolate the inner magnetic rotor 4 from the outside world and prevent external media from contaminating the inner magnetic rotor.

[0025] In this embodiment, the driven bushing 3 is a cylindrical structure with an upper end face extending outward and a lower end face extending outward. The upper end face of the sealing isolation sleeve 6 is fixedly connected to the lower end face of the driven bushing 3 by bolts. An annular groove is provided on the lower end face of the driven bushing 3, and an O-ring seal 8 is provided in the annular groove. The connection between the two converts the original dynamic seal into a static seal, and zero leakage is achieved through the O-ring seal 8.

[0026] In this embodiment, the magnetic coupling unit is located inside the cover 9, and the cover 9 is aligned with and fixed to the lower end face of the driven bushing 3.

[0027] In this embodiment, the purge hole 31 is located on one side of the upper end face of the driven shaft sleeve 3, and the purge hole 31 is connected to the gap between the driven shaft 2 and the driven shaft sleeve 3. The driven shaft sleeve 3 is also connected to a purge pipe 10, one end of which is used to connect to an external positive pressure gas source, and the other end is connected to the purge hole 31. Positive pressure gas is introduced into the gap between the driven shaft 2 and the driven shaft sleeve 3 through the purge hole 31, thereby ensuring that there is positive pressure in the gap. In this way, the powder inside the reaction chamber 7 will not leak into the gap between the driven shaft 2 and the driven shaft sleeve 3, thereby preventing the rotating shaft from jamming and being damaged.

[0028] The working principle of this embodiment is as follows: the drive unit drives the active shaft 1 to rotate, which in turn drives the outer magnetic rotor 5 to rotate; the power acting on the outer magnetic rotor 5 is transmitted to the inner magnetic rotor 4 through the sealing isolation sleeve 6 via magnetic force, causing the inner magnetic rotor 4 to start rotating, which in turn drives the driven shaft 2 to rotate; in addition, during the operation, positive pressure gas is continuously introduced into the purge hole 31 to ensure that there is positive pressure in the gap between the driven shaft 2 and its bushing. Since the torque is transmitted by the magnetic coupling unit between the two shafts, and the connection and fixation between the sealing isolation sleeve 6 and the driven shaft bushing 3 converts the original dynamic seal into a static seal, and zero leakage is achieved through the O-ring seal 8, the problem of easy leakage of the rotating shaft dynamic seal is solved, the reliability of the rotating shaft seal is greatly improved, and powder leakage into the shaft gap is avoided, which would cause the rotating shaft to jam; it also prevents dangerous gases from leaking into the outside, thereby greatly improving the safety and service life of the equipment.

[0029] Furthermore, the term "connection" should be interpreted broadly, for example, it can include fixed connections, detachable connections, or integral connections; it can include direct connections or indirect connections through an intermediate medium, and it can also include internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A rotating shaft sealing structure for a fluidized bed reactor, characterized in that, The device includes a shaft body and a magnetic coupling unit. The shaft body includes a driving shaft and a driven shaft. A driven shaft sleeve is fitted onto the driven shaft. The magnetic coupling unit includes an inner magnetic rotor, an outer magnetic rotor, and a sealing isolation sleeve. The inner magnetic rotor is connected to the driven shaft. The outer magnetic rotor is connected to the driving shaft. The sealing isolation sleeve is disposed between the inner and outer magnetic rotors, enclosing the inner magnetic rotor within it, and providing a static seal with the driven shaft sleeve. A purge hole is provided on the driven shaft sleeve.

2. The rotating shaft sealing structure of the fluidized bed reactor according to claim 1, characterized in that, The inner magnetic rotor and the outer magnetic rotor are linked by magnetic coupling to transmit torque.

3. The rotating shaft sealing structure of the fluidized bed reactor according to claim 1 or 2, characterized in that, The end face of the sealing isolation sleeve is fixedly connected to the end face of the driven shaft sleeve, and a sealing ring is provided between the two.

4. The rotating shaft sealing structure of the fluidized bed reactor according to claim 1 or 2, characterized in that, The purge hole is located on the end face of the driven bushing, and the purge hole is connected to the gap between the driven shaft and the driven bushing.

5. The rotating shaft sealing structure of the fluidized bed reactor according to claim 4, characterized in that, The driven bushing is also connected to a purge pipe. One end of the purge pipe is used to connect to an external positive pressure gas source, and the other end is connected to the purge hole. Positive pressure gas is introduced into the gap between the driven shaft and the driven bushing through the purge hole.

6. The rotating shaft sealing structure of the fluidized bed reactor according to claim 1 or 2, characterized in that, The upper end of the driven shaft extends into the reaction chamber, and the lower end is connected to the inner magnetic rotor; the upper end of the driving shaft is connected to the outer magnetic rotor, and the lower end is connected to the drive unit.

7. The rotating shaft sealing structure of the fluidized bed reactor according to claim 1 or 2, characterized in that, The magnetic coupling unit is located inside the cover, and the cover is connected to the lower end face of the driven bushing.

8. The rotating shaft sealing structure of the fluidized bed reactor according to claim 1 or 2, characterized in that, A gap is provided between the inner surface of the sealing isolation sleeve and the inner magnetic rotor; a gap is provided between the outer surface of the sealing isolation sleeve and the outer magnetic rotor.

9. The rotating shaft sealing structure of the fluidized bed reactor according to claim 2, characterized in that, The inner magnetic rotor and / or outer magnetic rotor are integrally formed ring-shaped permanent magnets; or the inner magnetic rotor and / or outer magnetic rotor include a non-magnetic substrate, on the surface of which magnetic strips are arranged circumferentially.

10. The rotating shaft sealing structure of the fluidized bed reactor according to claim 1 or 2, characterized in that, The sealing sleeve is made of non-magnetic material.

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