Multi-shaft linkage chemical reaction kettle sealing device

Abstract

The invention discloses a multi-shaft linkage chemical reaction kettle sealing device, which relates to the technical field of chemical equipment sealing, and is characterized in that the multi-shaft linkage chemical reaction kettle sealing device comprises a kettle cover fixedly mounted at the top of a reaction kettle, a plurality of mounting seats are arranged on the kettle cover, and rotating stirring shafts are arranged on the plurality of mounting seats; the third-stage pressure reduction unit is sleeved on the section, penetrating through the kettle cover, of the stirring shaft and is vertically stacked; main sealing rings are arranged at the top ends of the mounting seats, are pressed on the top of the three-stage microporous damping plate and are fixedly connected with the mounting seats; the multi-shaft hydraulic balance header is arranged on the kettle cover and is provided with a plurality of high-pressure air pumps, and the plurality of high-pressure air pumps are communicated with the plurality of mounting seats through pipelines; and the central control unit is arranged on the kettle cover and used for adjusting the multi-shaft hydraulic balance header in real time. Through cooperative control of the three-stage pressure reduction unit and the hydraulic balance system, stability and long service life of multi-shaft dynamic sealing are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of chemical equipment sealing, more particularly to a multi-shaft linkage chemical reaction kettle sealing device. BACKGROUND

[0002] Traditional reaction kettle stirring shaft sealing often uses single-stage mechanical sealing or packing sealing, but under the complex working conditions of multi-shaft linkage, high temperature and high pressure, the following defects exist: 1. Uneven multi-shaft pressure: mutual interference when multiple stirring shafts are running, leading to unbalanced sealing pressure between shafts, and easy local leakage; 2. Thermal stress accumulation: high-temperature medium in the reaction kettle causes thermal expansion and deformation of the sealing components, accelerating wear; 3. Insufficient pressure reduction capacity: single-stage sealing is difficult to dissipate the pressure of the medium step by step, and high-pressure fluid is easy to penetrate the sealing interface.

[0003] Therefore, a new scheme needs to be proposed to solve this problem. SUMMARY

[0004] In view of the deficiencies of the prior art, the purpose of the present application is to provide a multi-shaft linkage chemical reaction kettle sealing device, which realizes the stability and long service life of multi-shaft dynamic sealing through the coordinated control of the three-stage pressure reduction unit and the hydraulic balance system.

[0005] The above technical purpose of the present application is realized by the following technical scheme: a multi-shaft linkage chemical reaction kettle sealing device, comprising a kettle cover fixedly installed on the top of the reaction kettle, a plurality of mounting seats are provided on the kettle cover, a plurality of rotating stirring shafts are provided on the mounting seats, and a three-stage pressure reduction unit is provided on the stirring shaft passing through the kettle cover section in a vertical stack, the three-stage pressure reduction unit comprises a primary vortex pressure reduction ring, a secondary wedge-shaped damping ring and a tertiary microporous damping plate; A plurality of main sealing rings are provided at the top end of the mounting seat, and the main sealing ring is provided on the top of the tertiary microporous damping plate and is fixedly connected with the mounting seat; A multi-shaft hydraulic balance header is arranged on the kettle cover, the multi-shaft hydraulic balance header is provided with a plurality of high-pressure gas pumps, and the high-pressure gas pumps are communicated with the mounting seats through pipelines; A central control unit is arranged on the kettle cover for real-time adjustment of the multi-shaft hydraulic balance header.

[0006] Preferably, the inlet of the primary vortex pressure reduction ring towards one end of the reaction kettle is a wide mouth with a taper angle of 15°, the side wall of the wide mouth is provided with a spiral blade, and the spiral direction of the spiral blade is opposite to the rotating direction of the stirring shaft.

[0007] Preferably, the secondary wedge-shaped damping ring is in the shape of an L, and the inner wall of the secondary wedge-shaped damping ring is provided with a PEEK wear-resistant bushing that is attached to the stirring shaft, and the inside of the secondary wedge-shaped damping ring is provided with an annular cooling cavity.

[0008] Preferably, a cavity is formed between the tertiary micro-porous damping plate and the secondary wedge-shaped damping ring, and a plurality of micro-holes corresponding to the cavity are formed in the tertiary micro-porous damping plate, the micro-holes have a diameter of 0.05 mm, and the micro-holes have a density of 500 holes / cm 2.

[0009] Preferably, the contact surface between the primary vortex pressure-reducing ring, the secondary wedge-shaped damping ring and the tertiary micro-porous damping plate is sealed by a metal winding gasket.

[0010] Preferably, the mounting seat is provided with a delivery pipe and a recovery pipe that are in communication with the annular cooling cavity, one side of the delivery pipe is connected with a circulating pump, and the input end of the circulating pump is connected with a cooling liquid storage tank.

[0011] Preferably, a first sealing cavity is formed between the secondary wedge-shaped damping ring and the mounting seat, the mounting seat is further provided with a through hole that is in communication with the first sealing cavity, and the pipeline is in communication with the through hole.

[0012] Preferably, the end surface of the tertiary micro-porous damping plate is arrayed with a plurality of protrusions that are attached to the main sealing plate, the protrusions form a second sealing cavity between the tertiary micro-porous damping plate and the main sealing plate, a plurality of the mounting seats are each provided with a vent hole that is in communication with the second sealing cavity, the vent hole is provided with a temperature and pressure sensor, the vent hole is connected with a three-way valve through a vent pipe, and the three-way valve is electrically connected with the central control unit.

[0013] In summary, the present application has the following advantages: During operation, the pressure is reduced by about 25% through the helical blades on the primary vortex pressure-reducing ring of the tertiary pressure-reducing unit, and then the pressure passes through the secondary wedge-shaped damping ring and the tertiary micro-porous damping plate, the micro-holes generate a laminar boundary layer to continuously reduce the pressure to normal pressure, when the pressure on one stirring shaft suddenly increases, the temperature and pressure sensor detects the sudden increase in pressure and starts the high-pressure air pump and the three-way valve, the three-way valve is opened, the suddenly increased pressure is pre-distributed to other stirring shafts through the pipeline, so that the pressure on each stirring shaft main sealing ring is balanced, and the high-pressure air pump applies a thrust force to the secondary wedge-shaped damping ring to press the top end surface of the primary vortex pressure-reducing ring, thereby increasing the pressure-reducing effect, until the pressure in the second sealing cavity decreases to normal pressure, and then the stability and long service life of the multi-shaft dynamic sealing are realized through the cooperative control of the tertiary pressure-reducing unit and the hydraulic balance system. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a structural schematic diagram of the present application; Figure 2 is a structural schematic diagram of the stirring shaft and the mounting seat of the present application; Figure 3 is a sectional view of the stirring shaft and the mounting seat of the present application; Figure 4 is Figure 3 is an enlarged view of A in the figure; Figure 5 is a structural schematic diagram of the primary vortex pressure-reducing ring of the present application; Figure 6 is a structural schematic diagram of the secondary wedge-shaped damping ring and the tertiary microporous damping plate of the present application.

[0015] In the figure: 1, kettle cover; 2, mounting seat; 3, stirring shaft; 4, primary vortex pressure-reducing ring; 5, secondary wedge-shaped damping ring; 6, tertiary microporous damping plate; 7, main sealing ring; 8, multi-shaft hydraulic balance header; 9, high-pressure air pump; 10, pipeline; 11, wide mouth; 12, helical blade; 13, PEEK wear-resistant bushing; 14, annular cooling cavity; 15, micropore; 16, metal-wound gasket; 17, conveying pipe; 18, recovery pipe; 20, first sealing cavity; 21, through hole; 22, protrusion; 23, second sealing cavity; 24, air vent; 25, three-way valve. DETAILED DESCRIPTION

[0016] The present application will be described in detail below in conjunction with the drawings and examples.

[0017] A multi-shaft linkage chemical reaction kettle sealing device, as shown in Figures 1 to 6 the figure, comprises a kettle cover 1 fixedly installed on the top of a reaction kettle, a plurality of mounting seats 2 are arranged on the kettle cover 1, a plurality of stirring shafts 3 are arranged on the plurality of mounting seats 2 and rotate, and a three-stage pressure-reducing unit in which sections of the stirring shafts 3 pass through the kettle cover 1 are vertically stacked, the three-stage pressure-reducing unit comprises a primary vortex pressure-reducing ring 4, a secondary wedge-shaped damping ring 5 and a tertiary microporous damping plate 6; A main sealing ring 7 is arranged at the top end of each of the plurality of mounting seats 2, and the main sealing ring 7 is arranged on the top of the tertiary microporous damping plate 6 and is fixedly connected with the mounting seat 2; A multi-shaft hydraulic balance header 8 is arranged on the kettle cover 1, the multi-shaft hydraulic balance header 8 is provided with a plurality of high-pressure air pumps 9, and the plurality of high-pressure air pumps 9 are in communication with the plurality of mounting seats 2 through pipelines 10; A central control unit for real-time adjustment of the multi-shaft hydraulic balance header 8 is arranged on the kettle cover 1.

[0018] As described above, in the actual application process, the pressure of the main sealing ring 7 is gradually reduced by setting three-stage pressure reduction units, so that the pressure of the main sealing ring 7 is within the normal pressure value range, and the dynamic balance of the sealing pressure of each stirring shaft 3 is realized by the multi-shaft hydraulic balance header 8, the interference between the shafts is eliminated, and the central control unit adjusts the parameters of the multi-shaft hydraulic balance header 8 in real time to cope with the working condition fluctuation.

[0019] According to the above embodiment, further provided is that the inlet of the first-stage vortex pressure reduction ring 4 towards one end of the reaction kettle is a wide mouth 11 with a taper angle of 15°, the side wall of the wide mouth 11 is provided with a spiral blade 12, and the spiral direction of the spiral blade 12 is opposite to the rotating direction of the stirring shaft 3.

[0020] As described above, in the actual application process, the 15° taper angle wide mouth 11 inlet and the reverse spiral blade 12 are set, the reverse spiral blade 12 forms a shear vortex with the medium flow direction during operation, the flow rate is reduced by 30%-40%, the 15° taper angle wide mouth 11 design can avoid particle accumulation (especially suitable for catalyst slurry), so that the inlet pressure is reduced, and the traditional flow guide cover is replaced, and the pressure reduction and anti-coking functions are combined.

[0021] According to the above embodiment, further provided is that the cross section of the second-stage wedge-shaped damping ring 5 is L-shaped, the inner wall of the second-stage wedge-shaped damping ring 5 is provided with a PEEK wear-resistant bushing 13 abutting the stirring shaft 3, and the second-stage wedge-shaped damping ring 5 is provided with an annular cooling cavity 14 inside.

[0022] As described above, in the actual application process, the L-shaped cross section of the second-stage wedge-shaped damping ring 5 is set, so that a cavity is formed between the second-stage wedge-shaped damping ring 5 and the third-stage microporous damping plate 6, the PEEK wear-resistant bushing 13 is sleeved in the second-stage wedge-shaped damping ring 5, and the annular cooling cavity 14 is arranged in the second-stage wedge-shaped damping ring 5, so that the L-shaped cross section of the second-stage wedge-shaped damping ring 5 can compensate the radial runout (tolerance ±0.5mm) of the stirring shaft 3, the PEEK wear-resistant bushing 13 maintains low friction sealing at high temperature, reduces shaft wear, the annular cooling cavity 14 controls the sealing interface temperature to be ≤150℃, and prevents the PEEK wear-resistant bushing 13 from being deformed by heat.

[0023] According to the above embodiment, further provided is that a cavity is formed between the third-stage microporous damping plate 6 and the second-stage wedge-shaped damping ring 5, a plurality of micropores 15 corresponding to the cavity are arranged on the third-stage microporous damping plate 6, the diameter of the micropores 15 is φ0.05mm, and the density of the micropores 15 is 500 holes / cm².

[0024] As described above, in the actual application process, the micro-holes 15 with a diameter of φ0.05 mm are arranged on the three-stage micro-hole damping plate 6 corresponding to the cavities between the two-stage wedge-shaped damping ring 5, and the density of the micro-holes 15 is 500 holes / cm2, so that the micro-holes 15 generate a laminar boundary layer, the 10 MPa fluid is reduced to normal pressure, the φ0.05 mm aperture barrier blocks >80% of the reaction by-product particles, and the self-cleaning effect is achieved, According to the above embodiment, further arranged is that the contact surfaces between the first-stage vortex pressure reduction ring 4, the two-stage wedge-shaped damping ring 5 and the three-stage micro-hole damping plate 6 are sealed by the metal winding gasket 16.

[0025] As described above, in the actual application process, the metal winding gasket 16 is additionally arranged between the three-stage pressure reduction units to compensate for the thermal expansion difference under a temperature difference of 400°C, while ensuring zero leakage under a pressure of 20 MPa. The elastic modulus (190 GPa) of the metal winding gasket 16 is matched with the material of the pressure reduction unit to avoid cold flow failure.

[0026] According to the above embodiment, further arranged is that the mounting seat 2 is provided with a delivery pipe 17 and a recovery pipe 18 in communication with the annular cooling cavity 14, one side of the delivery pipe 17 is connected with a circulating pump, and the input end of the circulating pump is connected with a cooling liquid storage tank.

[0027] As described above, in the actual application process, through the arrangement of the delivery pipe 17+the recovery pipe 18+the circulating pump+the cooling liquid storage tank, when the working temperature of the PEEK wear-resistant bushing 13 increases, the circulating pump is powered to pump the cooling liquid in the cooling liquid storage tank to circulate in the annular cooling cavity 14 in the two-stage wedge-shaped damping ring 5, so as to cool down and stabilize the working temperature of the PEEK wear-resistant bushing 13 in the safe range of 120-150°C.

[0028] According to the above embodiment, further arranged is that the two-stage wedge-shaped damping ring 5 and the mounting seat 2 form a first sealing cavity 20, the mounting seat 2 is further provided with a through hole 21 in communication with the first sealing cavity 20, and the pipeline is in communication with the through hole 21.

[0029] As described above, in the actual application process, the first sealing cavity 20 is formed between the mounting seat 2 and the two-stage wedge-shaped damping ring 5, the pipeline of the high-pressure air pump 9 is connected with the first sealing cavity, so that the first sealing cavity is pressurized by the high-pressure air pump 9, and the two-stage wedge-shaped damping ring 5 can press the first-stage vortex pressure reduction ring 4 to compensate for the pressure.

[0030] According to the above embodiment, further provided is that the end face array of the three-stage micro-porous damping plate 6 is provided with a plurality of protrusions 22, the protrusions 22 are attached to the main sealing plate, the protrusions 22 form a second sealing cavity 23 between the three-stage micro-porous damping plate 6 and the main sealing plate, a plurality of the mounting seats 2 are each provided with a vent hole 24 in communication with the second sealing cavity 23, a temperature and pressure sensor is arranged in the vent hole 24, the vent hole 24 is connected with a three-way valve 25 through a vent pipe, and the three-way valve 25 is electrically connected with the central control unit.

[0031] As described above, in actual application, the temperature of the stirring shaft 3 is detected by the temperature and pressure sensor, when the temperature is greater than 150℃, the cooling flow is increased, at the same time, the pressure in the second sealing cavity 23 is detected, when the pressure difference suddenly increases by 10%, the hydraulic pressure is increased, at the same time, the three-way valve 25 is opened, so that the pressure is shared to other sealing shafts through the vent pipe, when the pressure is stable, the three-way valve 25 is closed, so that the multi-shaft pressure can be kept the same, and the imbalance of the sealing pressure between the shafts caused by the different sealing pressures is prevented.

[0032] Working principle: in operation, the pressure is reduced by about 25% through the helical blades 12 on the first-stage vortex pressure reduction ring 4 of the three-stage pressure reduction unit, then the pressure passes through the second-stage wedge-shaped damping ring 5 and the third-stage micro-porous damping plate 6, the laminar boundary layer is generated by the micro-pores 15, so that the fluid is continuously reduced to the normal pressure state, when the pressure on one stirring shaft 3 suddenly increases, the temperature and pressure sensor detects the sudden increase of the pressure, starts the high-pressure air pump 9 and the three-way valve 25, after the three-way valve 25 is opened, the suddenly increased pressure is shared to other stirring shafts 3 through the pipeline in advance, so that the main sealing ring 7 of each stirring shaft 3 is balanced, at the same time, the high-pressure air pump 9 applies a thrust force to the second-stage wedge-shaped damping ring 5, so that the second-stage wedge-shaped damping ring 5 is pressed against the top end face of the first-stage vortex pressure reduction ring 4, thereby increasing the pressure reduction effect, until the pressure in the second sealing cavity 23 decreases to the normal pressure state, then through the coordinated control of the three-stage pressure reduction unit and the hydraulic balance system, the stability and long service life of the multi-shaft dynamic sealing are realized.

[0033] The above is only the preferred embodiment of the present application, the protection scope of the present application is not limited to the above embodiment, any technical solution belonging to the idea of the present application is within the protection scope of the present application. It should be noted that, for ordinary technical personnel in the technical field, some improvements and decorations without departing from the principle of the present application are also considered as the protection scope of the present application.

Claims

1. A multi-axis chemical reactor sealing device, comprising a reactor cover (1) fixedly installed on the top of a reactor, a plurality of mounting seats (2) are arranged on the reactor cover (1), and a rotating stirring shaft (3) is arranged on each of the mounting seats (2), characterized in that: a three-stage pressure reduction unit in vertical stack is arranged on the section of the stirring shaft (3) penetrating through the reactor cover (1), the three-stage pressure reduction unit comprises a first-stage vortex pressure reduction ring (4), a second-stage wedge-shaped damping ring (5) and a third-stage microporous damping plate (6); a main sealing ring (7) is arranged at the top end of each of the mounting seats (2), and the main sealing ring (7) is arranged on the top of the third-stage microporous damping plate (6) and is fixedly connected with the mounting seat (2); a multi-axis hydraulic balance header (8) is arranged on the reactor cover (1), the multi-axis hydraulic balance header (8) is provided with a plurality of high-pressure gas pumps (9), and the plurality of high-pressure gas pumps (9) are respectively communicated with the plurality of mounting seats (2) through pipelines (10); a central control unit for adjusting the multi-axis hydraulic balance header (8) in real time is arranged on the reactor cover (1). The inlet of the first-stage vortex pressure reduction ring (4) towards one end of the reactor is a wide mouth (11) with a taper angle of 15°, the side wall of the wide mouth (11) is provided with a spiral blade (12), and the spiral direction of the spiral blade (12) is opposite to the rotating direction of the stirring shaft (3).

2. The polyaxially linked chemical reaction vessel sealing device according to claim 1, characterized in that The second-stage wedge-shaped damping ring (5) has an L-shaped cross section, the inner wall of the second-stage wedge-shaped damping ring (5) is provided with a PEEK wear-resistant bushing (13) abutting the stirring shaft (3), and an annular cooling cavity (14) is formed in the second-stage wedge-shaped damping ring (5).

3. The poly-axially linked chemical reaction vessel sealing device according to claim 2, characterized in that: A cavity is formed between the third-stage microporous damping plate (6) and the second-stage wedge-shaped damping ring (5), a plurality of micropores (15) corresponding to the cavity are formed in the third-stage microporous damping plate (6), the micropores (15) have a diameter of φ0.05mm, and the density of the micropores (15) is 500 holes / cm2.

4. The poly-axially linked chemical reaction vessel sealing device according to claim 3, characterized in that: The contact surfaces between the first-stage vortex pressure reduction ring (4), the second-stage wedge-shaped damping ring (5) and the third-stage microporous damping plate (6) are sealed by metal winding gaskets (16).

5. The poly-axially linked chemical reaction vessel sealing device according to claim 4, characterized in that: The mounting seat (2) is provided with a delivery pipe (17) and a recovery pipe (18) communicated with the annular cooling cavity (14), one side of the delivery pipe (17) is connected with a circulating pump, and the input end of the circulating pump is connected with a cooling liquid storage tank.

6. The poly-axially linked chemical reaction vessel sealing device according to claim 3, characterized in that: A first sealing cavity (20) is formed between the second-stage wedge-shaped damping ring (5) and the mounting seat (2), the mounting seat (2) is further provided with a through hole (21) communicated with the first sealing cavity (20), and the pipeline (10) is communicated with the through hole (21).

7. The poly-axially linked chemical reaction vessel sealing device according to claim 3, characterized in that: ​ 8. The poly-axially linked chemical reaction vessel sealing device according to claim 1, wherein: The end face array of the three-stage microporous damping plate (6) has a plurality of protrusions (22), the protrusions (22) are attached to the main sealing plate, the protrusions (22) form a second sealing cavity (23) between the three-stage microporous damping plate (6) and the main sealing plate, a plurality of the mounting seats (2) are each provided with a ventilation hole (24) in communication with the second sealing cavity (23), a temperature and pressure sensor is arranged in the ventilation hole (24), the ventilation hole (24) is connected with a three-way valve (25) through a ventilation pipe, and the three-way valve (25) is electrically connected with the central control unit.

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