Sealing device for a rotating shaft of a kneader

Abstract

A sealing device (123) for a rotating shaft (1) of a kneader; the rotating shaft (1) has a rotating shaft diameter (1D) and a rotating shaft axis (1C); the sealing device (123) is provided with a viscous seal (2) and a labyrinth seal (3).

Description

Technical Field

[0001] The field of this invention is a sealing device for the rotating shaft of a kneader. Background Technology

[0002] The kneader for mixing materials is equipped with a rotating shaft, and in order to prevent material from leaking to the outside of the kneader's mixing chamber, the kneader is additionally equipped with a sealing device.

[0003] List of cited references Patent documents PTL 1: US5413475A Patent document 1 discloses a screw that is inserted into the cylinder of an extruder, and a cooling hole is formed at the base of the screw. A viscous sealing sleeve with a multi-start square thread on its inner circumference is arranged between the base of the screw and the cylinder.

[0004] One constant goal of manufacturers using kneaders is to reduce the aforementioned leaks. Summary of the Invention

[0005] Technical issues During the research, the inventors discovered a specific sealing device (123) for the rotating shaft of a kneader that could unexpectedly improve and reduce leakage of the mixed material.

[0006] Solutions to technical problems The solution is to provide a sealing device (123) for a rotating shaft (1) of a kneader, the sealing device (123) being provided with an adhesive seal (2) and a labyrinth seal (3).

[0007] Advantages of the present invention A specific sealing device (123) for the rotating shaft of a kneader can unexpectedly improve and reduce leakage of the mixed material. Attached Figure Description

[0008] Figure 1 A cross-sectional schematic diagram of a portion of the kneader according to the invention (particularly the sealing device (123)) is shown; Figure 2 A cross-sectional schematic diagram of the sealing device (123) (especially the adhesive sealing rotating part (22)) according to the present invention is shown; Figure 3 A cross-sectional schematic diagram of the sealing device (123) according to the present invention (especially a labyrinth seal (3) provided with a labyrinth seal fixing part (31) and a labyrinth seal rotating part (32) is shown; Figure 4A cross-sectional schematic diagram of the sealing device (123) according to the invention (especially the labyrinth seal rotating part (32)) is shown. Detailed Implementation

[0009] Unless otherwise expressly stated, the following aspects, embodiments, examples, and variations thereof, including preferred scope, matters, or one or both, may be applied to any other aspects, embodiments, examples, and variations of the invention.

[0010] Any numerical interval expressed as “between a and b” represents a range of values ​​greater than “a” and less than “b” (i.e., excluding the limits a and b), while any numerical interval expressed as “from a to b” means a range of values ​​from “a” to “b” (i.e., including the strict limits a and b).

[0011] Figure 1 , Figure 2 , Figure 3 and Figure 4The first aspect of the invention is shown, which is a sealing device (123) for a rotating shaft (1) of a kneader; the rotating shaft (1) has a rotating shaft diameter (1D) and a rotating axis (1C); the sealing device (123) is provided with an adhesive seal (2) and a labyrinth seal (3); the adhesive seal (2) is provided with an adhesive seal fixing portion (21), an adhesive seal rotating portion (22) that rotates with the rotating shaft (1), and at least one adhesive seal gap (2122C), the at least one adhesive seal gap (2122C) being from the adhesive seal fixing portion At least one distance from the part (21) to the viscous sealing rotating part (22); the viscous sealing rotating part (22) has at least one viscous sealing rotating part spiral groove (221) and at least one viscous sealing rotating part thread (222) formed on the radial outer circumferential surface of the viscous sealing rotating part (22); the viscous sealing rotating part spiral groove (221) extends spirally about the rotation axis (1C) of the rotating shaft (1); the viscous sealing rotating part thread (222) is defined by the viscous sealing rotating part spiral groove (221); the labyrinth seal (3) is provided with a labyrinth seal The sealing fixed part (31), the labyrinth seal rotating part (32) rotating with the rotating shaft (1), and at least one labyrinth seal gap (3132C, 31243214C, 31243224C, 31143224C, 312453224C, 3124532145C, 312453225C, 31153225C, 31253225C, 31253215C), wherein at least one labyrinth seal gap is at least one distance from the labyrinth seal fixed part (31) to the labyrinth seal rotating part (32); The labyrinth seal fixing part (31) includes at least one labyrinth seal fixing part recess (311, 3114, 3115) and at least one labyrinth seal fixing part convex part (312, 3124, 31245, 3125) in the direction toward the labyrinth seal rotating part (32); the labyrinth seal rotating part (32) includes at least one labyrinth seal rotating part recess (3214, 32145, 3215) and at least one labyrinth seal rotating part convex part (322, 3224, 3225) in the direction toward the labyrinth seal fixing part (31).

[0012] According to a preferred embodiment of the invention, the kneader is a device for kneading at least one of plastics, rubber or a combination thereof, or a chemical agent and at least one of plastics, rubber or a combination thereof, by means of blades (1B) fixed to the rotating shaft of the kneader. Preferably, the chemical agent is at least one of fillers, coupling agents, plasticizers, anti-aging agents, antioxidants, crosslinking agents or a combination thereof.

[0013] According to a preferred embodiment of the invention, the adhesive sealing fixing part (21) is fixed to the housing (7) of the kneader, the labyrinth sealing fixing part (31), or both.

[0014] According to a preferred embodiment of the invention, the labyrinth sealing fixing part (31) is fixed to at least one or both of the housing (7) of the kneader and the adhesive sealing fixing part (21).

[0015] According to a preferred embodiment of the invention, the adhesive sealing rotating portion (22) is fixed to the rotating shaft (1), the labyrinth sealing rotating portion (32), or both.

[0016] According to a preferred embodiment of the invention, the labyrinth seal rotating portion (32) is fixed to the rotating shaft (1), the adhesive seal rotating portion (22), or both.

[0017] "Radial" means "in the radial direction", and the radial direction is the direction perpendicular to the axial direction, which is the direction parallel to the axis of rotation (1C) of the rotation axis (1).

[0018] According to a preferred embodiment of the present invention, the labyrinth seal rotating portion protrusion is a radial protrusion in the labyrinth seal rotating portion (32).

[0019] The second aspect of the invention is a sealing device (123) according to the first aspect, wherein the adhesive sealing rotating portion (22) has an adhesive sealing rotating portion diameter (22D) whose length is twice the distance from the radially outermost part of the adhesive sealing rotating portion (22) to the rotation axis (1C) of the rotating shaft (1), and the labyrinth sealing rotating portion (32) has a labyrinth sealing rotating portion diameter (32D) whose length is twice the distance from the radially outermost part of the labyrinth sealing rotating portion (32) to the rotation axis (1C) of the rotating shaft (1). Preferably, the labyrinth sealing rotating portion diameter (32D) is larger than the adhesive sealing rotating portion diameter (22D). More preferably, the ratio of the labyrinth sealing rotating portion diameter (32D) to the adhesive sealing rotating portion diameter (22D) is between 100.0% and 150.0%, even more preferably between 105.0% and 140.0%, and particularly between 110.0% and 130.0%. In the example shown in the figures, this ratio is 118.5%. This can make the sealing performance of the labyrinth seal (3) more effective.

[0020] According to a preferred embodiment of the second aspect, the ratio of the diameter of the viscous seal rotating portion (22D) to the diameter of the rotating shaft (1D) is between 100.0% and 150.0%, preferably between 100.0% and 140.0%, more preferably between 105.0% and 135.0%, and even more preferably between 110.0% and 130.0%. This is to strike a trade-off between effective sealing and prevention of overheating. In the example shown in the figures, the ratio of the diameter of the viscous seal rotating portion (22D) to the diameter of the rotating shaft (1D) is 119.4%.

[0021] According to a preferred embodiment of the second aspect, the ratio of the diameter of the labyrinth seal rotating portion (32D) to the diameter of the rotating shaft (1D) is between 100% and 200.0%, preferably between 100.0% and 170.0%, more preferably between 120.0% and 160.0%, and even more preferably between 130.0% and 150.0%. This is to strike a trade-off between effective sealing and prevention of overheating. In the example shown in the figures, the ratio of the diameter of the labyrinth seal rotating portion (32D) to the diameter of the rotating shaft (1D) is 142.0%.

[0022] A third aspect of the invention is a sealing device (123) according to the first or second aspect, wherein the labyrinth seal (3) is arranged closer to the discharge side end (5) of the rotating shaft (1) than the adhesive seal (2). This can improve the sealing performance.

[0023] A fourth aspect of the invention is a sealing device (123) according to the third aspect, wherein the labyrinth sealing fixing portion protrusion (3125) closest to the discharge side end (5) of the rotation axis (1) among the labyrinth sealing fixing portion protrusions (312, 3124, 31245, 3125) includes at least one radial recess (31251) and at least one radial non-recessed portion (31252) in the circumferential direction inside the labyrinth sealing fixing portion (31). The radial recess (31251) and the radial non-recessed portion (31252) can help to smoothly discharge unnecessary materials by cutting off portions of unnecessary materials.

[0024] According to the preferred embodiment of the fourth aspect, the number of radial recesses (31251) on the cross section perpendicular to the rotation axis (1C) is greater than the number of adhesive sealing rotating part threads (222) of the adhesive sealing rotating part (22) on the cross section perpendicular to the rotation axis (1C).

[0025] According to a preferred embodiment of the fourth aspect, the number of radial recesses (31251) on a cross section perpendicular to the axis of rotation (1C) is between 10 and 50, preferably between 15 and 45, more preferably between 20 and 40, and even more preferably between 25 and 35. In the sample shown in the figures, the number of labyrinth seal fixing portion protrusions (3125) on a cross section perpendicular to the axis of rotation (1C) is 30.

[0026] The fifth aspect of the invention is a sealing device (123) according to the third or fourth aspect, wherein the labyrinth sealing rotating portion (32) has at least two labyrinth sealing rotating portion recesses (3214, 32145, 3215), the at least two labyrinth sealing rotating portion recesses (3214, 32145, 3215) being an inner labyrinth sealing rotating portion recess and an outer labyrinth sealing rotating portion recess, the outer labyrinth sealing rotating portion recess being closer to the discharge side end (5) of the rotating shaft (1) than the inner labyrinth sealing rotating portion recess, and the inner labyrinth sealing rotating portion recess having a radius of (3214) of the inner labyrinth sealing rotating portion recess. R, 32145R), the inner concave radius of the labyrinth seal rotating part (3214R, 32145R) is the radius from the rotation axis (1C) of the rotating shaft (1) to the inner concave part of the labyrinth seal rotating part, the outer concave part of the labyrinth seal rotating part has the outer concave radius (3215R), the outer concave radius (3215R) of the labyrinth seal rotating part is the radius from the rotation axis (1C) of the rotating shaft (1) to the outer concave part of the labyrinth seal rotating part, and the outer concave radius (3215R) of the labyrinth seal rotating part is greater than the inner concave radius (3214R, 32145R). This can help return the mixed material to the opposite side end (4) to the discharge side end (5) of the rotating shaft (1).

[0027] A sixth aspect of the invention is a sealing device (123) according to any one of the first to fifth aspects, wherein the labyrinth seal rotating portion protrusion is formed by at least one labyrinth seal rotating ring, and the labyrinth seal rotating ring has at least one labyrinth seal rotating ring helical groove (32241, 32251) and at least one labyrinth seal rotating ring thread (32242, 32252) formed on the radially outer circumferential surface of the labyrinth seal rotating ring; the labyrinth seal rotating ring helical groove (32241, 32251) extends helically about the rotation axis (1C) of the rotating shaft (1); the labyrinth seal rotating ring thread (32242, 32252) is defined by the labyrinth seal rotating ring helical groove (32241, 32251). This can improve the sealing performance.

[0028] The seventh aspect of the invention is a sealing device (123) according to the sixth aspect, wherein the adhesive sealing rotating portion (22) has an adhesive sealing rotating portion width (22W) in a direction parallel to the rotation axis (1C) of the rotating shaft (1), and the labyrinth sealing rotating ring has a labyrinth sealing rotating ring width (3224W, 3225W) in a direction parallel to the rotation axis (1C) of the rotating shaft (1). Preferably, the labyrinth sealing rotating ring width (3224W, 3225W) is smaller than the adhesive sealing rotating portion width (22W) (for preventing overheating). Preferably, the ratio of the labyrinth sealing rotating ring width (3224W, 3225W) to the adhesive sealing rotating portion width (22W) is between 5.0% and 20.0%, more preferably between 10.0% and 15.0%. This is to achieve a compromise between effective sealing and prevention of overheating. In the example shown in the attached figure, the ratio of the width of the labyrinth seal rotating ring (3224W, 3225W) to the width of the viscous seal rotating portion (22W) is 11.9%.

[0029] According to a preferred embodiment of the seventh aspect, the ratio of the width (22W) of the viscous seal rotating portion to the diameter (1D) of the rotating shaft is between 50.0% and 100.0%, preferably between 55.0% and 95.0%, more preferably between 60.0% and 90.0%, even more preferably between 65.0% and 85.0%, and particularly between 70.0% and 75.0%. This is to strike a trade-off between effective sealing and prevention of overheating. In the example shown in the figures, the ratio of the width (22W) of the viscous seal rotating portion to the diameter (1D) of the rotating shaft is 74.3%.

[0030] According to a preferred embodiment of the seventh aspect, the ratio of the labyrinth seal rotating ring width (3224W, 3225W) to the rotating shaft diameter (1D) is between 4.0% and 20.0%, preferably between 5.0% and 13.0%, more preferably between 6.0% and 12.0%, and even more preferably between 7.0% and 11.0%. This is to strike a trade-off between effective sealing and prevention of overheating. In the example shown in the figures, the ratio of the labyrinth seal rotating ring width (3224W, 3225W) to the rotating shaft diameter (1D) is 8.8%.

[0031] The eighth aspect of the invention is a sealing device (123) according to the sixth or seventh aspect, wherein the adhesive sealing rotating part thread (222) has an adhesive sealing rotating part thread height (222H) in a direction perpendicular to the rotation axis (1C) of the rotating shaft (1), and the labyrinth sealing rotating ring thread (32242, 32252) has a labyrinth sealing rotating ring thread height (32242H, 32252H) in a direction perpendicular to the rotation axis (1C) of the rotating shaft (1). Preferably, the labyrinth seal rotary ring thread height (32242H, 32252H) is less than the viscous seal rotary portion thread height (222H) (to prevent overheating). More preferably, the ratio of the labyrinth seal rotary ring thread height (32242H, 32252H) to the viscous seal rotary portion thread height (222H) is between 60% and 100%, even more preferably between 65% and 95%, particularly between 70% and 90%, and even more particularly between 75% and 85%. This is to strike a trade-off between effective sealing and prevention of overheating. In the example shown in the accompanying drawings, the ratio of the labyrinth seal rotary ring thread height (32242H, 32252H) to the viscous seal rotary portion thread height (222H) is 80.0%.

[0032] According to a preferred embodiment of the eighth aspect, the ratio of the thread height (222H) of the viscous seal rotating portion to the diameter of the rotating shaft (1D) is between 1.0% and 10.0%, preferably between 1.0% and 8.0%, more preferably between 1.0% and 6.0%, and even more preferably between 2.0% and 4.0%. This is to strike a trade-off between effective sealing and prevention of overheating. In the example shown in the figures, the ratio of the thread height (222H) of the viscous seal rotating portion to the diameter of the rotating shaft (1D) is 3.3%.

[0033] According to a preferred embodiment of the eighth aspect, the ratio of the labyrinth seal rotary ring thread height (32242H, 32252H) to the rotary shaft diameter (1D) is between 1.0% and 10.0%, preferably between 1.0% and 7.0%, more preferably between 1.0% and 6.0%, and even more preferably between 1.0% and 5.0%. This is to strike a trade-off between effective sealing and prevention of overheating. In the example shown in the figures, the ratio of the labyrinth seal rotary ring thread height (32242H, 32252H) to the rotary shaft diameter (1D) is 2.7%.

[0034] The ninth aspect of the invention is a sealing device (123) according to any one of the sixth to eighth aspects, wherein the adhesive sealing rotating part thread (222) has an adhesive sealing rotating part thread angle (222A) on a cross section parallel to and including the rotation axis (1C) of the rotation shaft (1) from one side of the adhesive sealing rotating part thread (222) to the other side of the adhesive sealing thread, and the labyrinth sealing rotating ring thread (32242, 32252) has a labyrinth sealing rotating ring thread angle (32242A, 32252A) on a cross section parallel to and including the rotation axis (1C) of the rotation shaft (1), preferably, the labyrinth sealing rotating ring thread angle (32242A, 32252A) is smaller than the adhesive sealing rotating part thread angle (222A) (for preventing overheating).

[0035] According to a preferred embodiment of the ninth aspect, the thread angle (222A) of the viscous seal rotating portion is between 5 and 50 degrees, preferably between 10 and 40 degrees, more preferably between 15 and 35 degrees, even more preferably between 20 and 30 degrees, and particularly between 21 and 25 degrees. This is to strike a trade-off between effective sealing and prevention of overheating. In the example shown in the figures, the thread angle (222A) of the viscous seal rotating portion is 24 degrees.

[0036] According to a preferred embodiment of the ninth aspect, the labyrinth seal rotary ring thread angle (32242A, 32252A) is between 0 and 40 degrees, preferably between 5 and 35 degrees, more preferably between 10 and 30 degrees, even more preferably between 15 and 25 degrees, and particularly between 16 and 24 degrees. This is to strike a trade-off between effective sealing and prevention of overheating. In the example shown in the figures, the labyrinth seal rotary ring thread angle (32242A, 32252A) is 21 degrees.

[0037] The tenth aspect of the present invention is a sealing device (123) according to any one of the sixth to ninth aspects, wherein the adhesive sealing rotating part thread (222) has an adhesive sealing rotating part thread helix angle (222HA) from the direction parallel to the rotation axis (1C) of the rotation shaft (1) to the direction in which the adhesive sealing rotating part thread (222) extends, and the labyrinth sealing rotating ring thread (32242HA, 32252) has a labyrinth sealing rotating ring thread helix angle (32242HA, 32252HA) from the direction parallel to the rotation axis (1C) of the rotation shaft (1) to the direction in which the labyrinth sealing rotating ring thread (32242HA, 32252) extends, preferably, the labyrinth sealing rotating ring thread helix angle (32242HA, 32252HA) is smaller than the adhesive sealing rotating part thread helix angle (222HA) (for preventing overheating).

[0038] According to a preferred embodiment of the tenth aspect, the helix angle (222HA) of the viscous seal rotating part thread is between 50 and 90 degrees, preferably between 55 and 85 degrees, more preferably between 60 and 80 degrees, and even more preferably between 65 and 75 degrees. This is to strike a trade-off between effective sealing and prevention of overheating. In the example shown in the figures, the helix angle (222HA) of the viscous seal rotating part thread is 70 degrees.

[0039] According to a preferred embodiment of the tenth aspect, the helix angle (32242HA, 32252HA) of the labyrinth seal rotary ring thread is between 30 and 70 degrees, preferably between 35 and 65 degrees, more preferably between 40 and 60 degrees, and even more preferably between 45 and 55 degrees. This is to strike a trade-off between effective sealing and prevention of overheating. In the example shown in the accompanying drawings, the helix angle (32242HA, 32252HA) of the labyrinth seal rotary ring thread is 51 degrees.

[0040] The eleventh aspect of the invention is a sealing device (123) according to any one of the sixth to tenth aspects, wherein the adhesive sealing rotary thread (222) has a helical unfolding of the adhesive sealing rotary thread, and the labyrinth sealing rotary ring thread (32242, 32252) has a helical unfolding of the labyrinth sealing rotary ring thread. Preferably, the helical unfolding of the labyrinth sealing rotary ring thread is smaller than the helical unfolding of the adhesive sealing rotary thread (for preventing overheating). More preferably, the ratio of the helical unfolding of the labyrinth sealing rotary ring thread to the helical unfolding of the adhesive sealing rotary thread is between 80.0% and 100.0%, and even more preferably between 85.0% and 95.0%. This is to achieve a compromise between effective sealing and prevention of overheating. In the example shown in the figures, the ratio of the helical unfolding of the labyrinth sealing rotary ring thread to the helical unfolding of the adhesive sealing rotary thread is 88.9%.

[0041] The spiral unfolding of the viscous seal rotating part thread is the spiral distance of the viscous seal rotating part thread (222) during the process of rotating the rotating shaft (1) for a full circle (360 degrees). The spiral unfolding of the viscous seal rotating part thread has the following relationship: 222DH=22D×π / Sin(222HA).

[0042] The spiral unfolding of the labyrinth seal rotating ring thread is the spiral distance of the labyrinth seal rotating ring thread (32242, 32252) during the rotation of the rotating shaft (1) for one full revolution (360 degrees). In the case that the outermost radial part of the labyrinth seal rotating part (32) in this example as shown in the figure is the outermost radial part of the labyrinth seal rotating ring, the spiral unfolding of the labyrinth seal rotating ring thread has the following relationship: 32242DH=32D×π / Sin(32242HA), 32252DH=32D×π / Sin(32242HA).

[0043] According to the preferred embodiment of the eleventh aspect, the ratio of the helical unfolding of the viscous seal rotating part thread to the diameter of the rotating shaft (1D) is between 300.0% and 500.0%, preferably between 330.0% and 470.0%, more preferably between 360.0% and 440.0%, and even more preferably between 390.0% and 410.0%. This is to strike a trade-off between effective sealing and prevention of overheating. In the example shown in the figures, the ratio of the helical unfolding of the viscous seal rotating part thread to the diameter of the rotating shaft (1D) is 398.1%.

[0044] According to the preferred embodiment of the eleventh aspect, the ratio of the helical unfolding of the labyrinth seal rotary ring thread to the diameter of the rotating shaft (1D) is between 250.0% and 450.0%, preferably between 280.0% and 420.0%, more preferably between 310.0% and 390.0%, and even more preferably between 340.0% and 360.0%. This is to strike a trade-off between effective sealing and prevention of overheating. In the example shown in the figures, the ratio of the helical unfolding of the labyrinth seal rotary ring thread to the diameter of the rotating shaft (1D) is 354.0%.

[0045] The twelfth aspect of the invention is a sealing device (123) according to any one of the sixth to eleventh aspects, wherein the viscous sealing rotating part thread (222) has a viscous sealing rotating part thread lead in a direction parallel to the rotation axis (1C) of the rotation shaft (1), and the labyrinth sealing rotating ring thread (32242, 32252) has a labyrinth sealing rotating ring thread lead in a direction perpendicular to the rotation axis (1C) of the rotation shaft (1). Preferably, the labyrinth sealing rotating ring thread lead is greater than the viscous sealing rotating part thread lead (for preventing overheating). More preferably, the ratio of the labyrinth sealing rotating ring thread lead to the viscous sealing rotating part thread lead is between 100.0% and 300.0%, even more preferably between 130.0% and 270.0%, particularly between 160.0% and 240.0%, and even more particularly between 190.0% and 210.0%. This is to achieve a compromise between effective sealing and prevention of overheating. In the example shown in the attached figure, the ratio of the thread lead of the labyrinth seal rotating ring to the thread lead of the viscous seal rotating portion is 202.9%.

[0046] The lead of the viscous seal rotating part thread is the spiral advance of the viscous seal rotating part thread (222) in the direction parallel to the rotation axis (1C) of the rotating shaft (1) during the rotation of the rotating shaft (1) for a full circle (360 degrees). The lead of the viscous seal rotating part thread has the following relationship: 222L=22D×π / Tan(222HA).

[0047] The labyrinth seal rotating ring thread lead is the spiral advance of the labyrinth seal rotating ring thread (32242, 32252) in the direction parallel to the rotation axis (1C) of the rotating shaft (1) during the rotation of the rotating shaft (1) for a full revolution (360 degrees). In the case that the outermost radial part of the labyrinth seal rotating part (32) of this example as shown in the figure is the outermost radial part of the labyrinth seal rotating ring, the labyrinth seal rotating ring thread lead has the following relationship: 32242L=32D×π / Tan(32242HA), 32252L=32D×π / Tan(32252HA).

[0048] According to a preferred embodiment of the twelfth aspect, the ratio of the thread lead of the viscous seal rotating portion to the diameter (1D) of the rotating shaft is between 100.0% and 160.0%, preferably between 105.0% and 155.0%, more preferably between 110.0% and 150.0%, even more preferably between 115.0% and 145.0%, and particularly between 120.0% and 140.0%. This is to strike a trade-off between effective sealing and prevention of overheating. In the example shown in the figures, the ratio of the thread lead of the viscous seal rotating portion to the diameter (1D) of the rotating shaft is 132.7%.

[0049] According to a preferred embodiment of the twelfth aspect, the ratio of the labyrinth seal rotary ring thread lead to the diameter (1D) of the rotating shaft is between 200.0% and 340.0%, preferably between 220.0% and 320.0%, more preferably between 240.0% and 300.0%, and even more preferably between 260.0% and 280.0%. This is to strike a trade-off between effective sealing and prevention of overheating. In the example shown in the accompanying drawings, the ratio of the labyrinth seal rotary ring thread lead to the diameter (1D) of the rotating shaft is 269.4%.

[0050] The thirteenth aspect of the invention is a sealing device (123) according to any one of the sixth to twelfth aspects, wherein the number of labyrinth seal rotating ring threads (32242, 32252) on a cross section perpendicular to the rotation axis (1C) of the rotating shaft (1) is greater than the number of adhesive seal rotating portion threads (222) on a cross section perpendicular to the rotation axis (1C) of the adhesive seal rotating portion (22). (For effective sealing) The number of threads (222) of the viscous sealing rotating part (22) on the cross section perpendicular to the axis of rotation (1C) is the same as the number of thread ridges (or threads) of the viscous sealing rotating part (22).

[0051] The number of labyrinth seal rotary ring threads (32242, 32252) on the cross section of the rotation axis (1C) perpendicular to the rotation axis (1) is the same as the number of thread ridges (or threads) of the labyrinth seal rotary ring.

[0052] According to the preferred embodiment of the thirteenth aspect, the number of adhesive sealing rotary portion threads (222) of the adhesive sealing rotary portion (22) on a section perpendicular to the rotation axis (1C) of the rotation axis (1) is between 5 and 30, preferably between 6 and 28, more preferably between 7 and 26, even more preferably between 8 and 24, particularly between 9 and 22, even more particularly between 10 and 20, and even more particularly between 12 and 18. This is to make a compromise between effective sealing and prevention of overheating. In the example shown in the figures, the number of adhesive sealing rotary portion threads (222) is 16.

[0053] According to the preferred embodiment of the thirteenth aspect, the number of labyrinth seal rotary ring threads (32242, 32252) on a section perpendicular to the rotation axis (1C) of the rotation axis (1) is between 30 and 90, preferably between 40 and 80, more preferably between 40 and 80, and even more preferably between 50 and 70. This is to achieve a compromise between effective sealing and prevention of overheating. In the example shown in the figures, the number of labyrinth seal rotary ring threads (32242, 32252) is 60.

[0054] The fourteenth aspect of the invention is a sealing device (123) according to any one of the sixth to thirteenth aspects, wherein the viscous sealing rotating part thread (222) has a viscous sealing rotating part thread pitch in a direction parallel to the rotation axis (1C) of the rotation shaft (1), and the labyrinth sealing rotating ring thread (32242, 32252) has a labyrinth sealing rotating ring thread pitch in a direction perpendicular to the rotation axis (1C) of the rotation shaft (1). Preferably, the labyrinth sealing rotating ring thread pitch is greater than the viscous sealing rotating part thread pitch (for effective sealing). Preferably, the ratio of the labyrinth sealing rotating ring thread pitch to the viscous sealing rotating part thread pitch is between 10.0% and 100.0%, more preferably between 20.0% and 90.0%, even more preferably between 30.0% and 80.0%, particularly between 40.0% and 70.0%, and even more particularly between 50.0% and 60.0%. This is to achieve a compromise between effective sealing and prevention of overheating. In the example shown in the attached figure, the ratio of the thread pitch of the labyrinth seal rotating ring to the thread pitch of the viscous seal rotating part is 54.1%.

[0055] The pitch of the viscous seal rotating part thread is the distance from the vertex of the viscous seal rotating part thread (222) to the next vertex in the direction of the rotation axis (1C) parallel to the rotation axis (1). The pitch of the viscous seal rotating part thread has the following relationship: 222P=22D×π / Tan(222HA) / (number of thread edges (or number of lines) of the viscous seal rotating part (22)).

[0056] The pitch of the labyrinth seal rotary ring thread is the distance from the vertex of the labyrinth seal rotary ring thread (32242, 32252) to the next vertex in the direction parallel to the rotation axis (1C) of the rotation axis (1). In the case that the outermost radial part of the labyrinth seal rotary part (32) of this example as shown in the figure is the outermost radial part of the labyrinth seal rotary ring, the labyrinth seal rotary ring thread pitch has the following relationship: 32242P=32D×π / Tan(32242HA) / (number of threads (or number of lines) of the labyrinth seal rotary ring thread (32242)), 32252P=32D×π / Tan(32252HA) / (number of threads (or number of lines) of the labyrinth seal rotary ring thread (32252)).

[0057] According to a preferred embodiment of the fourteenth aspect, the ratio of the thread pitch of the viscous seal rotating portion to the diameter (1D) of the rotating shaft is between 2.0% and 15.0%, preferably between 3.0% and 14.0%, more preferably between 4.0% and 13.0%, even more preferably between 5.0% and 12.0%, and particularly between 6.0% and 11.0%. This is to strike a trade-off between effective sealing and prevention of overheating. In the example shown in the accompanying drawings, the ratio of the thread pitch of the viscous seal rotating portion to the diameter (1D) of the rotating shaft is 8.3%.

[0058] According to a preferred embodiment of the fourteenth aspect, the ratio of the labyrinth seal rotary ring thread pitch to the diameter (1D) of the rotating shaft is between 1.0% and 8.0%, preferably between 2.0% and 7.0%, more preferably between 3.0% and 8.0%, and even more preferably between 4.0% and 5.0%. This is to strike a trade-off between effective sealing and prevention of overheating. In the example shown in the accompanying drawings, the ratio of the labyrinth seal rotary ring thread pitch to the diameter (1D) of the rotating shaft is 4.5%.

[0059] According to a preferred embodiment of the invention, the labyrinth seal swivel ring has a circumferential surface coated using a nitriding method, wherein the Vickers hardness of the circumferential surface of the labyrinth seal swivel ring is preferably between 600 and 1200 HV, more preferably between 700 and 1100 HV, and even more preferably between 800 and 1000 HV. This can maintain improved leakage performance over a long period of time. In the example shown in the figures, the circumferential surface of the labyrinth seal swivel ring is coated using a nitriding method, and the Vickers hardness is 900 HV according to ISO 6507-1:2005 and ISO 6507-4:2005.

[0060] According to a preferred embodiment of the invention, the ratio of the viscous sealing gap (2122C) to the diameter of the rotating shaft (1D) is between 0.1% and 2.0%, preferably between 0.2% and 1.8%, more preferably between 0.3% and 1.7%, even more preferably between 0.4% and 1.6%, and particularly between 0.5% and 1.5%. This is to strike a trade-off between effective sealing and prevention of overheating. In the example shown in the figures, the ratio of the viscous sealing gap (2122C) to the diameter of the rotating shaft (1D) is 0.9% to 4.2%.

[0061] According to a preferred embodiment of the present invention, the labyrinth seal (3) is provided with a plurality of labyrinth seal gaps (3132C, 31243214C, 31243224C, 31143224C, 312453224C, 3124532145C, 312453225C, 31153225C, 31253225C, 31253215C), and the labyrinth seal gap is the distance from the labyrinth seal fixed part (31) to the labyrinth seal rotating part (32).

[0062] According to a preferred embodiment of the invention, the ratio of the labyrinth seal gaps (3132C, 31243214C, 31243224C, 31143224C, 312453224C, 3124532145C, 312453225C, 31153225C, 31253225C, 31253215C) to the diameter of the rotating shaft (1D) is between 0.1% and 15.0%, preferably between 0.2% and 13.0%, more preferably between 0.4% and 11.0%, and even more preferably between 0.6% and 10.0%. This is to strike a trade-off between effective sealing and prevention of overheating. In the example shown in the attached figure, the ratio of the labyrinth seal gaps (3132C, 31243214C, 31243224C, 31143224C, 312453224C, 3124532145C, 312453225C, 31153225C, 31253225C, 31253215C) to the diameter of the rotating shaft (1D) is 0.9% to 9.7%.

[0063] According to a preferred embodiment of the present invention, the labyrinth sealing fixing portion (31) includes a plurality of labyrinth sealing fixing portion recesses (311, 3114, 3115) and a plurality of labyrinth sealing fixing portion protrusions (312, 3124, 31245, 3125) in the direction toward the labyrinth sealing rotating portion (32). Preferably, the labyrinth sealing fixing portion protrusions (312, 3124, 31245, 3125) have a direction parallel to the rotation axis (1C) of the rotation axis (1) extending from the labyrinth. The distance (32143215D) between one of the sealing and fixing protrusions (312, 3124, 31245, 3125) and the next, and the ratio of the distance (32143215D) to the diameter of the rotating shaft (1D) is between 0.0% and 20.0%, preferably between 1.0% and 19.0%, more preferably between 2.0% and 18.0%, even more preferably between 3.0% and 17.0%, particularly between 4.0% and 16.0%, and more preferably between 5.0% and 15.0%. In the example shown in the figures, the ratio of the distance (32143215D) to the diameter of the rotating shaft (1D) is 10.0%.

[0064] According to a preferred embodiment of the present invention, the labyrinth seal rotating portion (32) includes a plurality of labyrinth seal rotating portion recesses (321, 3214, 32145, 3215) and a plurality of labyrinth seal rotating portion protrusions in the direction toward the labyrinth seal fixing portion (31), and the labyrinth seal rotating portion protrusions are formed by a plurality of labyrinth seal rotating rings.

[0065] The fifteenth aspect of the invention is a sealing device (123) according to any one of the first to fourteenth aspects, wherein the labyrinth seal (3) includes at least one cooling jacket (33), preferably, the cooling jacket (33) is arranged in the labyrinth seal fixing portion (31), more preferably, the cooling jacket (33) is provided with at least one cooling line (34), and even more preferably, the cooling line (34) is connected to a cooling device for circulating a cooling medium through the cooling line (34), particularly, the cooling medium is water.

[0066] According to a preferred embodiment of the invention, the kneader is provided with a rotating shaft (1) and a sealing device (123) according to any one of the first to fifteenth aspects.

[0067] The invention is further illustrated by the following non-limiting examples.

[0068] Example To confirm the effectiveness of the invention, the leakage performance of two sealing devices for the rotating shaft of a kneader, which are examples and reference examples according to the invention, was compared. The leakage performance was the amount of leakage of the rubber composition per day.

[0069] An example of the present invention is a sealing device (123) for the rotating shaft of a kneader, the sealing device (123) being provided with an adhesive seal (2) and a labyrinth seal (3) as shown in the figures, and a reference example is another sealing device for the rotating shaft of a kneader having the same rotating shaft diameter and rotating axis as the example of the present invention, the sealing device not being provided with any labyrinth seal, but having an adhesive seal having an adhesive seal rotating portion diameter (99% relative to 22D of the example of the present invention), an adhesive seal rotating portion width (95% relative to 22W of the example of the present invention), and an adhesive seal rotating portion screw... Thread height (80% relative to example 222H of the present invention), viscous seal thread angle (25 degrees), viscous seal rotating part thread helix angle (80 degrees), viscous seal rotating part thread helix spread (96% relative to example 222DH of the present invention), viscous seal rotating part thread lead (50% relative to example 222L of the present invention), number of threads (or lines) of viscous seal rotating part (number of threads: 10), viscous seal rotating part thread pitch (80% relative to example 222P of the present invention), viscous seal clearance (1 to 4% relative to example 1D of the present invention).

[0070] The results (leakage performance) are expressed as a base of 100, meaning that the value of 100 is assigned to the leakage amount (kg) per day of the reference machine, and the relative value of the leakage amount (kg) per day of the example machine with sealing device (123) is 26. The lower the value, the better the leakage performance.

[0071] The sealing device (123) for the rotating shaft of the kneader according to the invention can unexpectedly improve and reduce leakage of the mixed material.

Claims

1. A sealing device (123) for a rotating shaft (1) of a kneader; the rotating shaft (1) having a rotating shaft diameter (1D) and a rotating axis (1C); - The sealing device (123) is provided with an adhesive seal (2) and a labyrinth seal (3); - The adhesive seal (2) is provided with an adhesive seal fixing part (21), an adhesive seal rotating part (22) that rotates with the rotating shaft (1), and at least one adhesive seal gap (2122C), wherein the at least one adhesive seal gap (2122C) is at least one distance from the adhesive seal fixing part (21) to the adhesive seal rotating part (22); - The adhesive sealing rotating portion (22) has at least one adhesive sealing rotating portion spiral groove (221) and at least one adhesive sealing rotating portion thread (222) formed on the radial outer circumferential surface of the adhesive sealing rotating portion (22). - The spiral groove (221) of the viscous seal rotating part extends spirally around the rotation axis (1C) of the rotating shaft (1); - The viscous seal rotating part thread (222) is defined by the viscous seal rotating part helical groove (221); - The labyrinth seal (3) is provided with a labyrinth seal fixing part (31), a labyrinth seal rotating part (32) that rotates with the rotating shaft (1), and at least one labyrinth seal gap (3132C, 31243214C, 31243224C, 31143224C, 312453224C, 3124532145C, 312453225C, 31153225C, 31253225C, 31253215C), and at least one labyrinth seal gap is at least one distance from the labyrinth seal fixing part (31) to the labyrinth seal rotating part (32); - The labyrinth seal fixing portion (31) includes at least one labyrinth seal fixing portion recess (311, 3114, 3115) and at least one labyrinth seal fixing portion protrusion (312, 3124, 31245, 3125) in the direction toward the labyrinth seal rotating portion (32); and - The labyrinth seal rotating portion (32) includes at least one labyrinth seal rotating portion recess (3214, 32145, 3215) and at least one labyrinth seal rotating portion protrusion (322, 3224, 3225) in the direction toward the labyrinth seal fixing portion (31).

2. The sealing device (123) according to claim 1, wherein, The adhesive sealing rotating part (22) has an adhesive sealing rotating part diameter (22D), the length of which is twice the distance from the outermost radial part of the adhesive sealing rotating part (22) to the rotation axis (1C) of the rotating shaft (1). The labyrinth sealing rotating part (32) has a labyrinth sealing rotating part diameter (32D), the length of which is twice the distance from the outermost radial part of the labyrinth sealing rotating part (32) to the rotation axis (1C) of the rotating shaft (1). The labyrinth sealing rotating part diameter (32D) is greater than the adhesive sealing rotating part diameter (22D).

3. The sealing device (123) according to claim 2, wherein, The labyrinth seal (3) is arranged closer to the discharge side (5) of the rotating shaft (1) than the adhesive seal (2).

4. The sealing device (123) according to claim 3, wherein, The labyrinth seal fixing part protrusion (3125) closest to the discharge side end (5) of the rotation axis (1) in the labyrinth seal fixing part protrusion (312, 3124, 31245, 3125) includes at least one radial recess (31251) and at least one radial non-recessed part (31252) in the circumferential direction inside the labyrinth seal fixing part (31).

5. The sealing device (123) according to claim 4, wherein, The number of radial recesses on the cross section perpendicular to the axis of rotation (1C) is greater than the number of adhesive seal rotating part threads (222) on the cross section perpendicular to the axis of rotation (1C).

6. The sealing device (123) according to claim 5, wherein, The labyrinth seal rotating part (32) has at least two labyrinth seal rotating part recesses (3214, 32145, 3215), which are inner and outer recesses of the labyrinth seal rotating part. The outer recess of the labyrinth seal rotating part is closer to the discharge side end (5) of the rotating shaft (1) than the inner recess. The inner recess of the labyrinth seal rotating part has a radius of (3214R, 32145R). The inner concave radius (3214R, 32145R) of the rotating part is the radius from the rotation axis (1C) of the rotating shaft (1) to the inner concave part of the labyrinth seal rotating part. The outer concave part of the labyrinth seal rotating part has an outer concave radius (3215R). The outer concave radius (3215R) of the labyrinth seal rotating part is the radius from the rotation axis (1C) of the rotating shaft (1) to the outer concave part of the labyrinth seal rotating part. The outer concave radius (3215R) of the labyrinth seal rotating part is greater than the inner concave radius (3214R, 32145R) of the labyrinth seal rotating part.

7. The sealing device (123) according to claim 6, wherein, The labyrinth seal rotating portion protrusion is formed by at least one labyrinth seal rotating ring, and the labyrinth seal rotating ring has at least one labyrinth seal rotating ring helical groove (32241, 32251) and at least one labyrinth seal rotating ring thread (32242, 32252) formed on the radial outer circumferential surface of the labyrinth seal rotating ring; the labyrinth seal rotating ring helical groove (32241, 32251) extends helically about the rotation axis (1C) of the rotating shaft (1); the labyrinth seal rotating ring thread (32242, 32252) is defined by the labyrinth seal rotating ring helical groove (32241, 32251).

8. The sealing device (123) according to claim 7, wherein, The viscous sealing rotating part (22) has a viscous sealing rotating part width (22W) in a direction parallel to the rotation axis (1C) of the rotating shaft (1), and the labyrinth sealing rotating ring has a labyrinth sealing rotating ring width (3224W, 3225W) in a direction parallel to the rotation axis (1C) of the rotating shaft (1), and the labyrinth sealing rotating ring width (3224W, 3225W) is smaller than the viscous sealing rotating part width (22W).

9. The sealing device (123) according to claim 8, wherein, The viscous sealing rotating part thread (222) has a viscous sealing rotating part thread height (222H) in a direction perpendicular to the rotation axis (1C) of the rotating shaft (1), and the labyrinth sealing rotating ring thread (32242, 32252) has a labyrinth sealing rotating ring thread height (32242H, 32252H) in a direction perpendicular to the rotation axis (1C) of the rotating shaft (1), and the labyrinth sealing rotating ring thread height (32242H, 32252H) is less than the viscous sealing rotating part thread height (222H).

10. The sealing device (123) according to claim 9, wherein, The viscous sealing rotating part thread (222) has a viscous sealing rotating part thread angle (222A) on a cross section parallel to and including the rotation axis (1C) of the rotating shaft (1), from one side of the viscous sealing rotating part thread (222) to the other side of the viscous sealing thread. The labyrinth sealing rotating ring thread (32242, 32252) has a labyrinth sealing rotating ring thread angle (32242A, 32252A) on a cross section parallel to and including the rotation axis (1C) of the rotating shaft (1), from one side of the labyrinth sealing rotating ring thread (32242, 32252) to the other side of the labyrinth sealing rotating ring thread (32242, 32252), and the labyrinth sealing rotating ring thread angle (32242A, 32252A) is smaller than the viscous sealing rotating part thread angle (222A).

11. The sealing device (123) according to claim 10, wherein, The viscous sealing rotating part thread (222) has a viscous sealing rotating part thread helix angle (222HA) from the direction of the rotation axis (1C) parallel to the rotation axis (1) to the direction in which the viscous sealing rotating part thread (222) extends. The labyrinth sealing rotating ring thread (32242HA, 32252) has a labyrinth sealing rotating ring thread helix angle (32242HA, 32252HA) from the direction of the rotation axis (1C) parallel to the rotation axis (1) to the direction in which the labyrinth sealing rotating ring thread (32242HA, 32252) extends. The labyrinth sealing rotating ring thread helix angle (32242HA, 32252HA) is smaller than the viscous sealing rotating part thread helix angle (222HA).

12. The sealing device (123) according to claim 11, wherein, The viscous sealing rotating part thread (222) has a helical unfolding of the viscous sealing rotating part thread, and the labyrinth sealing rotating ring thread (32242, 32252) has a helical unfolding of the labyrinth sealing rotating ring thread, and the helical unfolding of the labyrinth sealing rotating ring thread is smaller than the helical unfolding of the viscous sealing rotating part thread.

13. The sealing device (123) according to claim 12, wherein, The viscous sealing rotating part thread (222) has a viscous sealing rotating part thread lead in a direction parallel to the rotation axis (1C) of the rotating shaft (1), and the labyrinth sealing rotating ring thread (32242, 32252) has a labyrinth sealing rotating ring thread lead in a direction perpendicular to the rotation axis (1C) of the rotating shaft (1), and the labyrinth sealing rotating ring thread lead is greater than the viscous sealing rotating part thread lead.

14. The sealing device (123) according to claim 13, wherein, The number of labyrinth seal rotating ring threads (32242, 32252) on the section perpendicular to the rotation axis (1C) of the labyrinth seal rotating ring is greater than the number of adhesive seal rotating part threads (222) on the section perpendicular to the rotation axis (1C) of the adhesive seal rotating part (22).

15. The sealing device (123) according to claim 14, wherein, The viscous sealing rotating part thread (222) has a viscous sealing rotating part thread pitch in a direction parallel to the rotation axis (1C) of the rotating shaft (1), and the labyrinth sealing rotating ring thread (32242, 32252) has a labyrinth sealing rotating ring thread pitch in a direction perpendicular to the rotation axis (1C) of the rotating shaft (1), and the labyrinth sealing rotating ring thread pitch is greater than the viscous sealing rotating part thread pitch.

16. The sealing device (123) according to claim 15, wherein, The labyrinth seal (3) includes at least one cooling jacket (33).

17. The sealing device (123) according to claim 16, wherein, The cooling jacket (33) is arranged in the labyrinth sealing fixing part (31).

18. The sealing device (123) according to claim 17, wherein, The cooling jacket (33) is provided with at least one cooling line (34).

19. The sealing device (123) according to claim 18, wherein, The cooling line (34) is connected to a cooling device for circulating the cooling medium through the cooling line (34).

20. The sealing device (123) according to claim 19, wherein, The cooling medium is water.

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