Combined mechanical seal for kneading reactor

Abstract

The present invention discloses a combined mechanical sealing device for a kneading reactor, comprising a sealing sleeve (2), a sealing gland assembly (16), a sealing stationary ring seat (14), a mechanical sealing seat (10), a sealing bearing seat (7), a sealing bearing gland (5), a stationary ring (20), a sealing dynamic ring (24) and a deep groove ball bearing (6) arranged on a shaft, characterized in that: a reverse thread (36) is arranged on the outer wall of one end of the sealing sleeve (2) corresponding to the sealing gland assembly (16), and a sealing reverse thrust sleeve (19) matching the reverse thread (36) is arranged in a cavity formed by the sealing gland assembly (16) and the sealing sleeve (2) where the reverse thread (36) is located. The present invention prevents materials from entering the sealing device by setting the reverse thread, and the sealing reverse thrust sleeve matching the reverse thread can further improve the sealing performance; and the sealing device can adapt to the axial movement caused by thermal expansion.

Description

Technical Field

[0001] The invention relates to the technical field of kneading reactors, in particular to a combined mechanical sealing device for kneading reactors. Background Art

[0002] Mechanical seals are widely used in mechanical stirring sealing devices. However, due to the limitations of the sealing structure, in certain working conditions, such as high temperature, high viscosity, polymerization reaction, etc., as the temperature rises, the shaft will expand and contract due to the increase in temperature, resulting in failure and leakage of the sealing surface, allowing materials to enter the mechanical seal. Summary of the invention

[0003] The object of the present invention is to provide a combined mechanical sealing device for a kneading reactor in view of the problems existing in the prior art.

[0004] The purpose of the present invention is to be solved by the following technical solutions:

[0005] A combined mechanical seal device for a kneading reactor comprises a sealing sleeve, a sealing gland assembly, a sealing stationary ring seat, a mechanical seal seat, a sealing bearing seat, a sealing bearing gland, a stationary ring, a sealing dynamic ring and a deep groove ball bearing arranged on a shaft, characterized in that a reverse thread is arranged on the outer wall of one end of the sealing sleeve corresponding to the sealing gland assembly, and a sealing reverse thrust sleeve matching the reverse thread is arranged in a cavity formed by the sealing gland assembly and the sealing sleeve where the reverse thread is located.

[0006] The inner side of the sealing gland assembly also forms a stuffing chamber and a leakage chamber with the outer wall of the sealing sleeve, and the cavity where the sealing reverse thrust sleeve is located and the leakage chamber are respectively located on the axial sides of the stuffing chamber; and the sealing gland assembly where the leakage chamber is located is provided with a leakage discharge hole that can be opened.

[0007] The packing cavity and the cavity where the sealing reverse thrust sleeve is located are separated by direct contact between the sealing gland assembly and the sealing sleeve. The packing cavity is filled with polytetrafluoroethylene fiber braided packing and a sealing packing pressure ring is provided axially of the polytetrafluoroethylene fiber braided packing. The opening of the packing cavity is closed by a packing spring seat with a cylindrical helical compression spring 2. One end of the cylindrical helical compression spring 2 arranged along the axial direction is embedded in the packing spring seat and the other end is against the sealing packing pressure ring.

[0008] A rotating Gly ring is arranged in the cavity of the sealing packing pressure ring, and the inner wall of the rotating Gly ring contacts the outer wall of the sealing sleeve, and an O-type rubber sealing ring 7 for sealing is arranged between the outer wall of the sealing packing pressure ring and the corresponding inner wall of the sealing gland assembly.

[0009] A sealing spring seat fixed on the outer wall of the sealing sleeve is provided in the cavity formed between the mechanical seal seat and the outer wall of the sealing sleeve, one end of the sealing dynamic ring is positioned on both axial sides of the sealing spring seat, and a static ring is correspondingly provided on the other end of the sealing dynamic ring, and the static ring is respectively embedded in the cavity formed by the sealing static ring seat and the sealing sleeve, and in the cavity formed by the sealing bearing seat and the sealing sleeve.

[0010] The outer side of the sealing spring seat is provided with a dynamic ring nesting which is axially concave-convexly embedded in each other. The sealing spring seat and the dynamic ring nesting are fixed to the outer wall of the sealing sleeve by means of a hexagonal cylindrical end set screw. A cylindrical helical compression spring 1 is provided in the cavity of the sealing spring seat facing the sealing bearing seat. One end of the cylindrical helical compression spring 1 is embedded in the bottom of the cavity of the sealing spring seat, and the other end rests on the corresponding dynamic ring nesting.

[0011] A rotating Gly ring seal is adopted between the inner wall of the sealing stationary ring seat in contact with the sealing shaft sleeve and the outer wall of the corresponding sealing shaft sleeve.

[0012] A pin is provided on one end of the sealing sleeve corresponding to the sealing bearing cover, and an axial adjustment groove is opened on the outer wall of the shaft where the pin is located, and a sleeve mounting step is opened on the inner wall of the sealing sleeve. The flat key mounting groove formed by the axial adjustment groove and the sleeve mounting step is used to embed the flat key. The pin passes through the sealing sleeve and is fixedly connected with the flat key to limit the relative position of the shaft and the sealing sleeve.

[0013] The axial length of the axial adjustment groove is 50 mm to 80 mm.

[0014] The inner wall of the sealing sleeve is provided with a sleeve adjustment step, and the outer wall of the shaft is provided with a shaft wall adjustment step corresponding to the sleeve adjustment step, and the shaft wall adjustment step and the shaft sleeve adjustment step are complementary in concave and convex manner.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] The sealing device of the present invention prevents materials from entering the sealing device by setting a reverse thread, and a sealing reverse thrust sleeve matched with the reverse thread can further improve the sealing performance; by setting a leakage cavity and a leakage discharge hole, when the material can still enter the leakage cavity through the reverse thread and the sealing reverse thrust sleeve, polytetrafluoroethylene fiber braided filler, filler spring seat and other sealing components, the material in the leakage cavity is discharged or extracted through the closable leakage discharge hole on the leakage cavity after accumulating for a period of time; the sealing device is provided with a flat key and a matching axial adjustment groove, a sleeve installation step, and a shaft wall adjustment step and a sleeve adjustment step, so that the sealing device can stably and controllably move axially to compensate for the axial displacement of the sealing device caused by thermal expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1It is a structural schematic diagram of a combined mechanical sealing device for a kneading reactor of the present invention;

[0018] Attached Figure 2 It is a schematic diagram of the state in which the movable rings of the present invention are nested and mutually concavely and convexly embedded.

[0019] Among them: 1-flat key; 2-sealing sleeve; 3-pin shaft; 4-shaft elastic retaining ring; 5-sealing bearing cover; 6-deep groove ball bearing; 7-sealing bearing seat; 8-O-type rubber seal ring 1; 9-O-type rubber seal ring 2; 10-mechanical seal seat; 11-cylindrical spiral compression spring 1; 12-sealing spring seat; 13-cylindrical spiral compression spring 2; 14-sealing stationary ring seat; 15-packing spring seat; 16-sealing cover assembly; 17-sealing packing pressure ring; 18-PTFE fiber braided packing; 19-sealing reverse thrust sleeve ; 20—static ring; 21—O-type rubber sealing ring three; 22—O-type rubber sealing ring four; 23—O-type rubber sealing ring five; 24—sealing dynamic ring; 241—dynamic ring nesting; 242—cylindrical pin; 25—setting screw; 26—O-type rubber sealing ring six; 27—rotating Gly ring; 28—O-type rubber sealing ring seven; 29—O-type rubber sealing ring eight; 30—axial adjustment groove; 31—shaft wall adjustment step; 32—sleeve adjustment step; 33—sleeve installation step; 34—leakage cavity; 35—leakage discharge hole; 36—reverse thread. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] like Figure 1 As shown: a combined mechanical sealing device for a kneading reactor, comprising a sealing sleeve 2, a sealing gland assembly 16, a sealing stationary ring seat 14, a mechanical seal seat 10, a sealing bearing seat 7, a sealing bearing gland 5, a stationary ring 20, a sealing dynamic ring 24 and a deep groove ball bearing 6 arranged on a shaft, a reverse thread 36 is arranged on the outer wall of one end of the sealing sleeve 2 corresponding to the sealing gland assembly 16, and the reverse thread 36 is arranged to prevent materials from entering the sealing device; and a sealing reverse thrust sleeve 19 matching the reverse thread 36 is arranged in the cavity formed by the sealing gland assembly 16 and the sealing sleeve 2 where the reverse thread 36 is located, and the sealing reverse thrust sleeve 19 is limited by a hole with an elastic retaining ring to further improve the sealing performance.

[0022] like Figure 1As shown: the inner side of the sealing gland assembly 16 and the outer wall of the sealing sleeve 2 form a stuffing cavity and a leakage cavity 34, and the cavity where the sealing reverse thrust sleeve 19 is located and the leakage cavity 34 are respectively located on both sides of the axial direction of the stuffing cavity; the stuffing cavity and the cavity where the sealing reverse thrust sleeve 19 is located are separated by direct contact between the sealing gland assembly 16 and the sealing sleeve 2, the stuffing cavity is filled with a polytetrafluoroethylene fiber braided packing 18, and a sealing packing pressure ring 17 is provided in the axial direction of the polytetrafluoroethylene fiber braided packing 18, and the opening of the stuffing cavity is closed by a stuffing spring seat 15 with a cylindrical helical compression spring 13, and the stuffing cavity is closed along the axial direction. One end of the cylindrical helical compression spring 13 is embedded in the packing spring seat 15, and the other end is against the sealing packing pressure ring 17; a rotating grid ring 27 is arranged in the cavity of the sealing packing pressure ring 17, and the inner wall of the rotating grid ring 27 is in contact with the outer wall of the sealing sleeve 2, and an O-type rubber sealing ring 28 for sealing is arranged between the outer wall of the sealing packing pressure ring 17 and the corresponding inner wall of the sealing cover assembly 16; a leakage hole 35 that can be opened is opened on the sealing cover assembly 16 where the leakage cavity 34 is located, and the material accumulated in the leakage cavity 34 is discharged by opening the leakage hole 35.

[0023] like Figure 1 , Figure 2 As shown: Further, a sealing spring seat 12 fixed to the outer wall of the sealing sleeve 2 is provided in the cavity formed between the mechanical seal seat 10 and the outer wall of the sealing sleeve 2, and a dynamic ring nest 241 is provided on the outer side of the sealing spring seat 12, which is mutually concave and convexly embedded in the axial direction, and the two dynamic ring nests 241 arranged in the axial direction are sleeved outside the sealing spring seat 12, and the sealing spring seat 12 and the dynamic ring nest 241 are fixed to the outer wall of the sealing sleeve 2 by the hexagonal cylindrical end set screw 25 (the protrusion of the dynamic ring nest 241 is used for fixing the set screw 25, attached Figure 1 Due to the position of the cross section, the set screw 25 is only present in Figure 1The sealing spring seat 12 is provided with a cylindrical helical compression spring 11 in the cavity of the sealing spring seat 12 facing the sealing bearing seat 7. The function of the cylindrical helical compression spring 11 is to compensate for the wear of the friction pair formed by the sealing static ring 20 and the sealing dynamic ring 24. One end of the cylindrical helical compression spring 11 is embedded in the bottom of the cavity of the sealing spring seat 12, and the other end is against the corresponding dynamic ring nest 241. For the sealing dynamic ring 24, the sealing spring seat 12 and the dynamic ring nest 241 constitute a One end of the sealing dynamic ring 24 is respectively embedded in the axial cavities on both sides, and the other end of the sealing dynamic ring 24 is correspondingly provided with a static ring 20, and the inner side of the dynamic ring nest 241 is provided with a cylindrical pin 242 for further limiting the sealing dynamic ring 24; the static ring 20 is respectively embedded in the cavity formed by the sealing static ring seat 14 and the sealing sleeve 2, and in the cavity formed by the sealing bearing seat 7 and the sealing sleeve 2; in addition, a rotating Gly ring 27 is used to seal between the inner wall of the sealing static ring seat 14 in contact with the sealing sleeve 2 and the outer wall of the corresponding sealing sleeve 2.

[0024] Specifically, six grooves evenly distributed along the circumference of the shaft are arranged on the outside of the sealing sleeve 2 in the axial direction, and six hexagon socket cylindrical end set screws 25 are inserted into the grooves corresponding to the dynamic ring nest 241 and the sealing spring seat 12 for embedding the sealing dynamic ring 24. At this time, the dynamic ring nest 241 and the sealing spring seat 12 are fixed to the outer wall of the sealing sleeve 2 by the hexagon socket cylindrical end set screws 25. When the mechanical seal device of the present invention slides on the sealing sleeve 2, the hexagon socket cylindrical end set screws 25 can play a positioning role, and this structure meets the requirements for the mechanical seal device when the shaft is deformed by heat or cold.

[0025] On the basis of the above sealing structure, a structure in which the above sealing device can move axially can also be provided to compensate for the axial displacement of the sealing device caused by thermal expansion. The specific structure is: a pin shaft 3 is provided on one end of the sealing sleeve 2 corresponding to the sealing bearing gland 5, and an axial adjustment groove 30 with an axial length of 50mm to 80mm is opened on the outer wall of the shaft where the pin shaft 3 is located, and a sleeve installation step 33 is opened on the inner wall of the sealing sleeve 2. The flat key installation groove formed by the axial adjustment groove 30 and the sleeve installation step 33 is used to embed the flat key 1. The pin shaft 3 passes through the sealing sleeve 2 and the flat key 1 and is fixedly connected to limit the relative position of the shaft and the sealing sleeve 2; in order to cooperate with the axial displacement of the flat key 1 and to play a limiting role, a sleeve adjustment step 32 is opened on the inner wall of the sealing sleeve 2, and a shaft wall adjustment step 31 corresponding to the sleeve adjustment step 32 is opened on the outer wall of the shaft, and the shaft wall adjustment step 31 and the sleeve adjustment step 32 are complementary in concave and convex.

[0026] Embodiment 1

[0027] like Figure 1As shown, the components required for the combined mechanical sealing device for the kneading reactor include: a flat key 1, a sealing sleeve 2, a pin 3, a shaft elastic retaining ring 4, a sealing bearing gland 5, a deep groove ball bearing 6, a sealing bearing seat 7, an O-type rubber sealing ring 1 8, an O-type rubber sealing ring 2 9, a mechanical sealing seat 10, a cylindrical helical compression spring 1 11, a sealing spring seat 12, a cylindrical helical compression spring 2 13, a sealing stationary ring seat 14, a packing spring seat 15, a sealing gland assembly 16, a sealing packing Compression ring 17, polytetrafluoroethylene fiber braided packing 18, sealing reverse thrust sleeve 19, static ring 20, O-type rubber sealing ring three 21, O-type rubber sealing ring four 22, O-type rubber sealing ring five 23, sealing dynamic ring 24, hexagon socket cylindrical end set screw 25, O-type rubber sealing ring six 26, rotating Gley ring 27, O-type rubber sealing ring seven 28, O-type rubber sealing ring eight 29, axial adjustment groove 30, shaft wall adjustment step 31, sleeve adjustment step 32, sleeve installation step 33. A sealing sleeve 2 is sleeved on the shaft, and the inner wall of the sealing sleeve 2 and the outer wall of the shaft are sealed at one end by an O-type rubber sealing ring 8 29, and the other end is sealed by an O-type rubber sealing ring 3 21; at the position where the O-type rubber sealing ring 8 29 is located, a sealing gland assembly 16 with a coolant cavity is arranged outside the sealing sleeve 2, and a sealing reverse thrust sleeve 19 is arranged in the lower cavity at the contact point between the sealing gland assembly 16 and the sealing sleeve 2, and the upper cavity at the contact point constitutes a packing cavity; a reverse thread 36 is arranged on the outer wall of the sealing sleeve 2 where the sealing reverse thrust sleeve 19 is located, and the reverse thread 36 can prevent materials from entering the sealing device, and the matching structure of the sealing reverse thrust sleeve 19 and the reverse thread 36 improves the sealing performance; the packing cavity is filled with a polytetrafluoroethylene fiber braided packing 18, and a sealing packing pressure ring 17 is installed above the polytetrafluoroethylene fiber braided packing 18; a rotating gray is arranged in the cavity of the sealing packing pressure ring 17 The inner wall of the rotating Gray ring 27 contacts the outer wall of the sealing sleeve 2, and an O-type rubber sealing ring 28 for sealing is arranged between the outer wall of the sealing packing pressure ring 17 and the corresponding inner wall of the sealing cover assembly 16; a packing spring seat 15 for closing the packing cavity is arranged above the sealing packing pressure ring 17, and the lower end of the cylindrical helical compression spring 13 embedded in the packing spring seat 15 abuts against the upper end of the sealing packing pressure ring 17, and the setting of the cylindrical helical compression spring 13 provides an axial movement space for the polytetrafluoroethylene fiber braided packing 18; the axial upper side of the packing spring seat 15 constitutes a leakage cavity 34, when the material can still enter the leakage cavity 34 through the reverse thread 36 and the sealing reverse thrust sleeve 19, the polytetrafluoroethylene fiber braided packing 18, the packing spring seat 15 and other sealing components, and the material in the leakage cavity 34 accumulates for a period of time and is discharged through the leakage discharge hole 35 that can be closed on the leakage cavity 34.A sealing stationary ring seat 14 is sleeved above the sealing gland assembly 16, and a mechanical seal seat 10 is provided above the sealing stationary ring seat 14, and a sealing bearing seat 7 is provided above the mechanical seal seat 10. The contact surfaces between the sealing stationary ring seat 14 and the sealing gland assembly 16, between the contact surfaces between the sealing stationary ring seat 14 and the mechanical seal seat 10, and between the contact surfaces between the mechanical seal seat 10 and the sealing bearing seat 7 are sealed respectively by corresponding O-type rubber sealing rings 9; a stationary ring 20 is installed in a cavity formed by the inner side of the sealing stationary ring seat 14 and the outer wall of the sealing sleeve 2, an O-type rubber sealing ring 8 is used to seal between the outer side of the stationary ring 20 and the inner side of the sealing stationary ring seat 14, and a rotating sealing ring 18 is used between the inner wall of the sealing stationary ring seat 14 below the stationary ring 20 and the outer wall of the sealing sleeve 2 The rotating Gley ring 27 is sealed; a sealing dynamic ring 24 is provided above the static ring 20, and the upper end of the sealing dynamic ring 24 is embedded in the sealing spring seat 12, and an O-type rubber sealing ring 22 is used to seal between the upper inner side of the sealing dynamic ring 24 and the lower outer side of the sealing spring seat 12, and an installation step for limiting the sealing spring seat 12 is provided on the outer wall of the sealing sleeve 2, and the sealing spring seat 12 is fixed to the outer wall of the sealing sleeve 2 by a hexagonal cylindrical end set screw 25, and an O-type rubber sealing ring 5 23 and an O-type rubber sealing ring 6 26 are respectively used to seal between the upper and lower sides of the inner wall of the sealing spring seat 12 and the outer wall of the sealing sleeve 2; a cylindrical helical compression spring 11 arranged axially is provided in the cavity of the sealing spring seat 12, and the upper The end is fixed on the lower end face of another sealing dynamic ring 24 embedded in the sealing spring seat 12, and the lower inner side of the sealing dynamic ring 24 and the upper outer side of the sealing spring seat 12 are sealed by a corresponding O-type rubber sealing ring 22; another static ring 20 is also provided above the sealing dynamic ring 24 located axially above the sealing spring seat 12, and the static ring 20 is embedded in the stepped cavity between the inner side of the sealing bearing seat 7 and the outer wall of the sealing sleeve 2, and the outer side of the static ring 20 and the inner side of the sealing bearing seat 7 are sealed by a corresponding O-type rubber sealing ring 8; a deep groove ball bearing 6 is installed in the cavity formed between the upper part of the sealing bearing seat 7 and the outer wall of the sealing sleeve 2, and the deep groove ball bearing 6 is limited in the above-mentioned cavity by the sealing bearing pressure cover 5, and is embedded in The shaft elastic retaining ring 4 on the outer wall of the sealing sleeve 2 can also limit the position of the deep groove ball bearing 6; a pin shaft 3 is provided on the sealing sleeve 2 located on the upper side of the sealing bearing cover 5, and the pin shaft 3 can limit the flat key 1 in the flat key installation groove formed by the axial adjustment groove 30 and the sleeve installation step 33. The axial adjustment groove 30 with a length of 50mm to 80mm is axially arranged on the outer wall of the shaft, so that the position of the flat key installation groove can be adjusted, thereby further adjusting the axial position of the flat key 1 and compensating for the axial displacement caused by thermal expansion; a shaft wall adjustment step 31 is provided on the axial lower side of the axial adjustment groove 30, and a sleeve adjustment step 32 corresponding to the shaft wall adjustment step 31 is provided on the inner wall of the sleeve, and the shaft wall adjustment step 31 and the sleeve adjustment step 32 are complementary in concave and convex.

[0028] The rotating Gly Ring 27 for shaft is a bidirectional high-pressure rotating sealing element. It has the characteristics of good sealing performance, low friction resistance, long service life, wear resistance, no sticking phenomenon, anti-extrusion and small structural size. The rotating Gly Ring 27 for shaft is generally installed in a closed groove: (1) First put the O-ring into the groove and press the PTFE slip ring into a heart shape, but be careful to prevent it from breaking; (2) Put the pressurized PTFE slip ring on the O-ring, and then use a round rod (usually with 10-15°) to flatten the PTFE slip ring in the direction of the arrow to restore it to its original size. Installation instructions: 1. Sharp corners must be deburred and must be blunted and chamfered. If threads are encountered when installing the seal, protection must be added to prevent damage to the seal; 2. Any rust, dirt, debris or foreign particles must be removed to prevent dust from causing damage to the seal, oil leakage, etc.; 3. Do not use tools with sharp corners during installation; 4. Before installation, the cylinder, rotating shaft and seal need to be lubricated with oil or grease. If grease is used, it must not contain solid additives (such as molybdenum disulfide or zinc sulfide); 5. The PTFE slip ring can be heated in oil or water to 80-120°C, and the PTFE slip ring will expand, so that the rotating Gly Ring 27 is easier to install.

[0029] The sealing device of the present invention prevents materials from entering the sealing device by setting the reverse thread 36. In addition, the sealing reverse thrust sleeve 19 matched with the reverse thread 36 can further improve the sealing performance. By setting the leakage cavity 34 and the leakage discharge hole 35, when the material can still enter the leakage cavity 34 through the reverse thread 36 and the sealing reverse thrust sleeve 19, the polytetrafluoroethylene fiber braided packing 18, the packing spring seat 15 and other sealing components, the material in the leakage cavity 34 accumulates for a period of time and is discharged or extracted through the closable leakage discharge hole 35 on the leakage cavity 34. The sealing device can stably and controllably move axially through the flat key 1 and the matching axial adjustment groove 30, the sleeve installation step 33, the shaft wall adjustment step 31 and the sleeve adjustment step 32 to compensate for the axial displacement of the sealing device caused by thermal expansion.

[0030] The above embodiments are only for illustrating the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the present invention; any technology not involved in the present invention can be realized by existing technologies.

Claims

1. A combined mechanical seal device for a kneading reactor, comprising a sealing sleeve (2) arranged on a shaft, a sealing gland assembly (16), a sealing stationary ring seat (14), a mechanical seal seat (10), a sealing bearing seat (7), a sealing bearing gland (5), a stationary ring (20), a sealing dynamic ring (24) and a deep groove ball bearing (6), characterized in that: A reverse thread (36) is provided on the outer wall of one end of the sealing sleeve (2) corresponding to the sealing gland assembly (16), and a sealing reverse thrust sleeve (19) matching the reverse thread (36) is provided in the cavity formed by the sealing gland assembly (16) and the sealing sleeve (2) where the reverse thread (36) is located; the inner side of the sealing gland assembly (16) and the outer wall of the sealing sleeve (2) also form a packing cavity and a leakage cavity (34), and the cavity where the sealing reverse thrust sleeve (19) is located and the leakage cavity (34) are respectively located on the axial sides of the packing cavity; and a leakage hole (35) that can be opened is opened on the sealing gland assembly (16) where the leakage cavity (34) is located; a rotating Gly ring (27) is used to seal between the inner wall of the sealing stationary ring seat (14) in contact with the sealing sleeve (2) and the outer wall of the corresponding sealing sleeve (2).

2. The combined mechanical sealing device for a kneading reactor according to claim 1, characterized in that: The packing cavity and the cavity where the sealing reverse thrust sleeve (19) is located are separated by direct contact between the sealing gland assembly (16) and the sealing shaft sleeve (2); the packing cavity is filled with a polytetrafluoroethylene fiber braided packing (18) and a sealing packing pressure ring (17) is provided in the axial direction of the polytetrafluoroethylene fiber braided packing (18); the opening of the packing cavity is closed by a packing spring seat (15) with a cylindrical helical compression spring (13); one end of the cylindrical helical compression spring (13) arranged in the axial direction is embedded in the packing spring seat (15) and the other end is against the sealing packing pressure ring (17).

3. The combined mechanical sealing device for a kneading reactor according to claim 2, characterized in that: A rotating Gly ring (27) is arranged in the cavity of the sealing packing pressure ring (17), and the inner wall of the rotating Gly ring (27) is in contact with the outer wall of the sealing sleeve (2), and an O-type rubber sealing ring (28) for sealing is arranged between the outer wall of the sealing packing pressure ring (17) and the corresponding inner wall of the sealing gland assembly (16).

4. The combined mechanical sealing device for a kneading reactor according to claim 1, characterized in that: A sealing spring seat (12) fixed to the outer wall of the sealing sleeve (2) is provided in the cavity formed between the mechanical seal seat (10) and the outer wall of the sealing sleeve (2); one end of a sealing dynamic ring (24) is positioned on both axial sides of the sealing spring seat (12); a stationary ring (20) is provided at the other end of the sealing dynamic ring (24); the stationary ring (20) is respectively embedded in the cavity formed by the sealing static ring seat (14) and the sealing sleeve (2), and in the cavity formed by the sealing bearing seat (7) and the sealing sleeve (2).

5. The combined mechanical sealing device for a kneading reactor according to claim 4, characterized in that: The outer side of the sealing spring seat (12) is provided with a movable ring nest (241) which is mutually concave-convexly embedded in the axial direction. The sealing spring seat (12) and the movable ring nest (241) are fixed to the outer wall of the sealing shaft sleeve (2) by means of a hexagon socket cylindrical end set screw (25). A cylindrical helical compression spring (11) is provided in the cavity of the sealing spring seat (12) facing the sealing bearing seat (7). One end of the cylindrical helical compression spring (11) is embedded in the bottom of the cavity of the sealing spring seat (12), and the other end abuts against the corresponding movable ring nest (241).

6. The combined mechanical sealing device for a kneading reactor according to claim 1, characterized in that: A pin (3) is provided on one end of a sealing sleeve (2) corresponding to a sealing bearing gland (5), an axial adjustment groove (30) is provided on the outer wall of a shaft where the pin (3) is located, and a sleeve mounting step (33) is provided on the inner wall of the sealing sleeve (2). The axial adjustment groove (30) and the sleeve mounting step (33) form a flat key mounting groove for embedding the flat key (1). The pin (3) passes through the sealing sleeve (2) and is fixedly connected to the flat key (1) to define the relative position of the shaft and the sealing sleeve (2).

7. The combined mechanical sealing device for a kneading reactor according to claim 6, characterized in that: The axial length of the axial adjustment groove (30) is 50 mm to 80 mm.

8. The combined mechanical sealing device for a kneading reactor according to claim 6 or 7, characterized in that: The inner wall of the sealing shaft sleeve (2) is provided with a shaft sleeve adjustment step (32), and the outer wall of the shaft is provided with a shaft wall adjustment step (31) opposite to the shaft sleeve adjustment step (32), the shaft wall adjustment step (31) and the shaft sleeve adjustment step (32) being complementary in concave and convex shapes.

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