Composite mechanical seal structure for extruder

Abstract

The utility model discloses a compound mechanical seal structure for an extruder. The compound mechanical seal structure comprises a medium side moving ring, a medium side static ring seat, an atmosphere side moving ring and an atmosphere side static ring seat, a medium side static ring groove is formed in the medium side static ring seat, and a medium side spring and a medium side static ring are mounted in the medium side static ring seat; an atmosphere-side static ring groove is formed in the atmosphere-side static ring seat, and an atmosphere-side spring and an atmosphere-side static ring are mounted in the atmosphere-side static ring seat; the medium side static ring corresponds to the medium side moving ring in position, and the atmosphere side static ring corresponds to the atmosphere side moving ring in position; the medium side static ring seat and the atmosphere side static ring seat are fixedly installed in a socket mode, and a sealing ring is arranged between the medium side static ring seat and the atmosphere side static ring seat. The medium side static ring seat is provided with a first air outlet and a first air inlet, and the atmosphere side static ring seat is provided with a second air outlet and a second air inlet. By means of the shallow grooves evenly distributed in the moving ring, the non-contact gap is 2-4 microns during rotation, nitrogen or compressed gas enters through the gas inlet to blow leaked media back into a cabin, the zero-leakage and zero-escape effects are achieved, the sealing effect is remarkable, and high efficiency and environmental protection are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of extruder sealing structures, in particular to a composite sealing structure for an extruder. Background Art

[0002] Normally, the tail of the screw of a twin-screw plastic extruder is sealed with a packing or a sealing ring, which includes a sealing chamber, an inner pressure ring, a sealing ring, an outer pressure ring, etc. During the rotation of the screw shaft, the elastic deformation of the packing or the sealing ring is used to complete the rotary sealing problem. Due to the differences in the types of processed materials, the application is limited. There are always problems of wear, consumption and leakage in the application, especially under high corrosion and high temperature conditions. The packing machine seal will leak ABS dust, and dust leakage has the potential safety hazard of causing explosion. Utility Model Content

[0003] The technical problem to be solved by the utility model is: how to solve the problem that the seal of the extruder filler will leak ABS dust, and the dust leakage may cause explosion.

[0004] In order to solve the above technical problems, the utility model has obtained the technical solution of the utility model through practice and summary. The utility model adopts the following technical solution:

[0005] A composite mechanical seal structure for an extruder, comprising a medium side dynamic ring, a medium side static ring seat, an atmosphere side dynamic ring, and an atmosphere side static ring seat;

[0006] A medium side static ring groove is arranged on the medium side static ring seat, and a medium side spring and a medium side static ring are installed inside;

[0007] An atmospheric layer static ring groove is arranged on the atmospheric side static ring seat, and an atmospheric side spring and an atmospheric side static ring are installed inside;

[0008] The positions of the static ring on the medium side and the dynamic ring on the medium side, and the static ring on the atmosphere side and the dynamic ring on the atmosphere side correspond;

[0009] The static ring seat on the medium side and the static ring seat on the atmosphere side are fixedly installed by sockets and a sealing ring is arranged between the two;

[0010] The medium-side static ring seat is provided with an air outlet 1 and an air inlet 1, and the atmosphere-side static ring seat is provided with an air outlet 2 and an air inlet 2.

[0011] In a preferred solution, a toothed seal 1 and a toothed seal 2 are installed inside the atmosphere-side static ring seat, and the toothed seal 1 and the toothed seal 2 are respectively located on both sides of the air inlet 2.

[0012] In a preferred solution, the gas outlet 1 is inclined toward the atmosphere side dynamic ring, and a slope structure is provided on one side of the medium side static ring close to the atmosphere side dynamic ring, and the slope structure and the gas outlet 1 are distributed in a mirror image direction.

[0013] Preferably, a plurality of toothed ring sheet structures are arranged on the outer peripheral surface of the atmosphere-side dynamic ring along the width direction, a toothed sealing structure is installed inside the medium-side static ring seat, and toothed structures are evenly spaced on the inner wall of the toothed sealing structure along the width direction, the toothed structure is suitable for being inserted and socketed in the toothed ring sheet structure and the inner circle of the toothed structure gradually approaches the medium side.

[0014] In a preferred solution, the air inlet is located at the top of the atmosphere-side dynamic ring close to the atmosphere side, and a slope structure is provided on the atmosphere-side dynamic ring suitable for guiding the air intake to the atmosphere side.

[0015] Preferably, the medium-side static ring and the atmosphere-side static ring both include a static ring body and a push plate, a sealing ring is sandwiched between the static ring body and the push plate, and the sealing ring is suitable for sealing and adapting to the corresponding static ring groove, the static ring body is suitable for adapting and installing with the corresponding dynamic ring, and the push plate is connected to the corresponding spring.

[0016] In a preferred solution, sealing rings are provided on the outer sides of the atmosphere-side stationary ring seat and the medium-side stationary ring seat.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model adopts two dynamic rings and two corresponding static rings, and forms a non-contact seal by arranging the dynamic rings and the static rings. By utilizing the evenly distributed shallow grooves (dynamic pressure grooves) on the dynamic ring, a non-contact gap of 2 to 4 microns is achieved during rotation. Nitrogen or compressed gas is used to enter through the air inlet to blow the leaked medium back into the cabin, thereby achieving the effect of zero leakage and zero escape. The sealing effect is remarkable and the seal is efficient and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 It is a partial schematic diagram of the toothed sealing structure and the toothed ring plate structure.

[0021] In the figure: 1. moving ring on the medium side; 2. stationary ring seat on the medium side; 21. stationary ring groove on the medium side; 22. spring on the medium side; 23. stationary ring on the medium side; 24. air outlet one; 25. air inlet one; 26. toothed seal structure; 3. moving ring on the atmosphere side; 31. toothed ring sheet structure; 4. stationary ring seat on the atmosphere side; 41. stationary ring groove on the atmosphere side; 42. spring on the atmosphere side; 43. stationary ring on the atmosphere side; 44. air outlet two; 45. air inlet two; 46. toothed seal one; 47. toothed seal two; 5. stationary ring body; 6. push plate. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0024] Example 1

[0025] like Figure 1 and Figure 2 As shown, a composite mechanical seal structure for an extruder includes a medium-side dynamic ring 1, a medium-side static ring seat 2, an atmosphere-side dynamic ring 3, and an atmosphere-side static ring seat 4;

[0026] A medium side stationary ring groove 21 is provided on the medium side stationary ring seat 2, and a medium side spring 22 and a medium side stationary ring 23 are installed inside;

[0027] The atmospheric side static ring seat 4 is provided with an atmospheric side static ring groove 41, and an atmospheric side spring 42 and an atmospheric side static ring 43 are installed inside;

[0028] The medium-side static ring 23 and the medium-side dynamic ring 1, the atmosphere-side static ring 43 and the atmosphere-side dynamic ring 3 correspond in position;

[0029] The medium-side stationary ring seat 2 and the atmosphere-side stationary ring seat 4 are fixedly installed by sockets and a sealing ring is arranged between the two;

[0030] An air outlet 24 and an air inlet 25 are provided on the medium-side static ring seat 2. The air outlet 24 is located on the left side of the atmosphere-side dynamic ring 3, and the air inlet 25 is located on the right side of the atmosphere-side dynamic ring 3.

[0031] An air outlet 2 44 and an air inlet 2 45 are provided on the atmospheric side static ring seat 4, and a toothed seal 1 46 and a toothed seal 2 47 are installed inside the atmospheric side static ring seat 4. The toothed seal 1 46 and the toothed seal 2 47 are respectively located on the left and right sides of the air inlet 2 45, and the air outlet 2 44 is located on the left side of the toothed seal 1 46.

[0032] The gas outlet 24 is inclined toward the atmosphere side dynamic ring 3, and a slope structure is provided on one side of the medium side static ring 23 close to the atmosphere side dynamic ring 3, and the slope structure and the gas outlet 24 are distributed in a mirror image direction.

[0033] The air inlet 25 is located at the top of the atmosphere-side dynamic ring 3 close to the atmosphere side, and a slope structure is provided on the atmosphere-side dynamic ring 3 to guide the air intake to the atmosphere side.

[0034] The medium-side static ring 23 and the atmosphere-side static ring 43 both include a static ring body 5 and a push plate 6. A sealing ring is sandwiched between the static ring body 5 and the push plate 6, and the sealing ring is suitable for sealing and adapting to the corresponding static ring groove. The static ring body 5 is suitable for adapting and installing with the corresponding dynamic ring, and the push plate 6 is connected to the corresponding spring.

[0035] When the medium side dynamic ring 1 and the atmosphere side dynamic ring 3 are both in high-speed rotation with the extruder head, the medium side dynamic ring 1 rotates at high speed, and dynamic pressure grooves are evenly distributed on the dynamic ring. The dynamic pressure grooves will drive the static ring body 5 to compress the medium side spring 22 through the push plate 6, and form a micro gap with the medium side static ring 23, and leakage will occur. The air inlet 25 will be in the air intake state, and a part of it will be blown back into the cabin through the atmosphere side dynamic ring 3. The atmosphere side dynamic ring 3 rotates at high speed, and dynamic pressure grooves are evenly distributed on the dynamic ring. The dynamic pressure grooves will drive the static ring body 5 to compress the atmosphere side spring 42 through the push plate 6, and form a micro gap with the atmosphere side static ring 43, and then flow to the atmosphere side, and gas will enter the air inlet 2 45, and part of the gas will flow to the air outlet 2 44 through the toothed seal 1 46, and the other part will directly flow to the atmosphere side through the toothed seal 2 47. The gas flowing from the air inlet 1 25 to the atmosphere side and the gas flowing from the air inlet 2 45 to the air outlet 2 44 will finally be discharged from the air outlet 2 44.

[0036] Embodiment 2, based on the above-mentioned embodiment 1, the following improvements are made: a plurality of toothed ring sheet structures 31 are arranged on the outer peripheral surface of the atmosphere side dynamic ring 3 along the width direction, a toothed sealing structure 26 is installed inside the medium side static ring seat 2, and toothed structures are evenly spaced on the inner wall of the toothed sealing structure 26 along the width direction, and the toothed structure is suitable for being inserted and socketed in the toothed ring sheet structure 31, and the inner ring of the toothed structure gradually approaches the medium side. By using the toothed structure to be inserted and socketed in the toothed ring sheet structure 31 and the inner ring gradually approaching the medium side, the gas entering from the air inlet can enter between the two dynamic rings in one direction, thereby completing the one-way backflush effect, without ensuring the air intake volume or air intake pressure of the air inlet 25.

[0037] Embodiment 3 makes the following improvements on the basis of the above-mentioned embodiment 1: sealing rings are provided on the outer sides of the atmosphere-side stationary ring seat 4 and the medium-side stationary ring seat 2 to ensure the sealing effect of the composite mechanical seal structure.

[0038] On the basis of the above implementation scheme, the following improvements can be made: a damping structure is installed in both the air inlet 1 25 and the air inlet 2 45. The damping structure is annular and has a damping hole thereon, which plays a role in reducing pressure and limiting flow, so that the pressure and flow of the gas entering the sealing surface can be controlled by controlling the size of the damping hole.

[0039] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited to this. The replacement can be a replacement of part of the structure, device, method step, or a complete technical solution. Equivalent replacement or change based on the technical solution of the utility model and its utility model concept should be included in the protection scope of the utility model.

Claims

1. A composite machine seal structure for an extruder, characterized in that: It comprises a medium-side moving ring (1), a medium-side stationary ring seat (2), an atmosphere-side moving ring (3), and an atmosphere-side stationary ring seat (4); A medium side stationary ring groove (21) is provided on the medium side stationary ring seat (2), and a medium side spring (22) and a medium side stationary ring (23) are installed inside; An atmospheric side static ring groove (41) is provided on the atmospheric side static ring seat (4), and an atmospheric side spring (42) and an atmospheric side static ring (43) are installed inside; The positions of the medium-side static ring (23) and the medium-side dynamic ring (1), the atmosphere-side static ring (43) and the atmosphere-side dynamic ring (3) correspond; The medium-side stationary ring seat (2) and the atmosphere-side stationary ring seat (4) are fixedly installed by socket-jointing, and a sealing ring is arranged between the two. The medium-side stationary ring seat (2) is provided with an air outlet port 1 (24) and an air inlet port 1 (25), and the atmosphere-side stationary ring seat (4) is provided with an air outlet port 2 (44) and an air inlet port 2 (45).

2. A composite mechanical seal structure for an extruder according to claim 1, characterized in that: The atmosphere-side stationary ring seat (4) is internally installed with a toothed seal 1 (46) and a toothed seal 2 (47), and the toothed seal 1 (46) and the toothed seal 2 (47) are respectively located on both sides of the air inlet 2 (45).

3. The composite seal structure for an extruder according to claim 1, characterized in that: The gas outlet 1 (24) is inclined toward the atmosphere side dynamic ring (3), and a slope structure is provided on one side of the medium side static ring (23) close to the atmosphere side dynamic ring (3), and the slope structure and the gas outlet 1 (24) are distributed in a mirror image direction.

4. The composite seal structure for an extruder according to claim 1, characterized in that: A plurality of toothed ring sheet structures (31) are arranged on the outer peripheral surface of the atmosphere side dynamic ring (3) along the width direction, and a toothed sealing structure (26) is installed inside the medium side static ring seat (2). Toothed structures are evenly spaced on the inner wall of the toothed sealing structure (26) along the width direction. The toothed structure is suitable for being inserted into the toothed ring sheet structure (31) and the inner circle of the toothed structure gradually approaches the medium side.

5. The composite seal structure for an extruder according to claim 1, characterized in that: The air inlet 1 (25) is located at the top of the atmosphere side dynamic ring (3) close to the atmosphere side, and a slope structure is provided on the atmosphere side dynamic ring (3) suitable for guiding the air intake to the atmosphere side.

6. The composite seal structure for an extruder according to claim 1, characterized in that: The medium-side static ring (23) and the atmosphere-side static ring (43) both include a static ring body (5) and a push plate (6). A sealing ring is sandwiched between the static ring body (5) and the push plate (6), and the sealing ring is suitable for sealing and fitting with the corresponding static ring groove. The static ring body (5) is suitable for fitting and installing with the corresponding dynamic ring, and the push plate (6) is connected to the corresponding spring.

7. The composite seal structure for an extruder according to claim 1, characterized in that: The outer sides of the atmosphere-side static ring seat (4) and the medium-side static ring seat (2) are both provided with sealing rings.

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