A sealing device for internal mixer

Abstract

The present invention belongs to the field of mechanical technology of internal mixers, and particularly refers to a sealing device for internal mixers. It includes an internal mixer chamber and a rotor, a rotating shaft is provided at the end of the rotor, a bearing hole is provided on the side wall of the internal mixer chamber, a dynamic sealing ring, a static sealing ring and a gland are sequentially sleeved on the rotating shaft away from the rotor, the dynamic sealing ring and the static sealing ring are arranged in the inner cavity of the bearing hole, the gland is fixedly connected to the outer wall of the internal mixer chamber by fasteners, the gland is also fixedly connected to the static sealing ring by fasteners, more than two grooves are provided on the outer wall of the internal mixer chamber, and a convex ring matched with the groove is provided on the gland. The present invention forms a labyrinth sealing structure by connecting a plurality of convex rings with the grooves, thereby extending the leakage path of the material and achieving the purpose of preventing material leakage. It has a good sealing effect, can effectively prevent material leakage, and reduce material waste.

Description

Technical field:

[0001] The invention belongs to the technical field of internal mixers, and in particular relates to a sealing device for internal mixers. Background technology:

[0002] Internal mixer is a kind of high-strength intermittent mixing equipment widely used in rubber industry. It is mainly used for mixing rubber or plastic with compounding agent, and can also be used for plasticizing rubber or plastic. In the working process of internal mixer, in order to prevent the material from leaking from the gap between the rotating shaft of the rotor and the internal mixing chamber, a sealing device is usually provided at the connection between the two ends of the rotating shaft and the internal mixing chamber. The sealing device includes a dynamic sealing ring and a static sealing ring. The dynamic sealing ring is sleeved on the end of the rotating shaft and can rotate relative to the static sealing ring under the drive of the rotor. The static sealing ring is sleeved on the sealing dynamic ring, and one end of the static sealing ring is fixedly connected to the end face of the rotor. The fixed connection between the static sealing ring and the internal mixer rotor, the tight fit between the dynamic sealing ring and the static sealing ring, and the dynamic sealing ring and the rotating shaft prevents the material from leaking from the gap between the rotating shaft and the internal mixing chamber.

[0003] However, since the internal mixer is under high pressure during operation and the rotor and shaft are in motion, materials will still leak out of the internal mixer from the gap between the static seal ring and the rotor end face, the gap between the shaft and the dynamic seal ring, and the gap between the dynamic seal ring and the static seal ring. This not only causes waste of materials, but also further causes machine pressure relief, thereby reducing processing efficiency. Summary of the invention:

[0004] The purpose of the present invention is to provide a sealing device for an internal mixer which has good sealing effect and can effectively prevent material leakage.

[0005] The present invention is achieved in that:

[0006] A sealing device for an internal mixer comprises an internal mixer and a rotor, wherein a rotating shaft is provided at the end of the rotor, a bearing hole is provided on the side wall of the internal mixer, a dynamic sealing ring, a static sealing ring and a pressure cover are sequentially sleeved on the rotating shaft away from the rotor, the dynamic sealing ring and the static sealing ring are arranged in the inner cavity of the bearing hole, and the dynamic sealing ring is contacted and connected with the end face of the rotor, the pressure cover is fixedly connected to the outer side wall of the internal mixer by fasteners, and the pressure cover is also fixedly connected to the static sealing ring by fasteners, and the outer side wall of the internal mixer is provided with two or more annular grooves with the center point of the bearing hole as the center of the circle, and the pressure cover is provided with a convex ring matched with the groove.

[0007] In the above-mentioned sealing device for internal mixer, the cross section of the groove is rectangular or trapezoidal.

[0008] In the above-mentioned sealing device for an internal mixer, the specific structure in which the gland is fixedly connected to the outer wall of the internal mixing chamber by fasteners is: more than three mounting holes evenly distributed circumferentially around the center of the gland are provided on the outer edge of the gland, and the gland is fixedly connected to the outer wall of the internal mixing chamber by bolts passing through the mounting holes.

[0009] In the above-mentioned sealing device for an internal mixer, the gland is also fixedly connected to the static sealing ring by fasteners in a specific structure: the gland is provided with more than two positioning holes evenly distributed circumferentially around the center of the gland, and the gland is fixedly connected to the corresponding end faces of the static sealing ring by bolts passing through the positioning holes.

[0010] In the above-mentioned sealing device for an internal mixer, the specific structure of the dynamic sealing ring and the static sealing ring being arranged in the inner cavity of the bearing hole is: the bearing hole includes a first small diameter portion and a first large diameter portion, a first positioning step is formed between the first small diameter portion and the first large diameter portion, the dynamic sealing ring is arranged in the inner cavity of the first small diameter portion, the static sealing ring is arranged in the inner cavity of the first large diameter portion, and the outer diameter of the static sealing ring is greater than the outer diameter of the dynamic sealing ring.

[0011] In the above-mentioned sealing device for an internal mixer, an axial oil lubrication hole is penetrated on the side where the static sealing ring and the dynamic sealing ring are in contact and connected, and an oil inlet hole corresponding to the position of the axial oil lubrication hole is provided on the pressure cover, and the oil inlet hole and the axial oil lubrication hole form a lubricating oil injection channel.

[0012] In the above-mentioned sealing device for internal mixer, radial oil lubrication holes are provided on the inner wall surface of the static sealing ring, and the radial oil lubrication holes are communicated with the axial oil lubrication hole pipeline.

[0013] In the above-mentioned sealing device for an internal mixer, the static sealing ring includes a second small diameter portion and a second large diameter portion, a second positioning step is formed between the second small diameter portion and the second large diameter portion, the second small diameter portion is sleeved on the rotating shaft, the dynamic sealing ring is arranged in the inner cavity of the second large diameter portion, and its end face is in contact and connected with the second positioning step, the axial oil lubrication hole is arranged on the side surface of the second positioning step, and the radial oil lubrication hole is arranged on the inner wall surface of the second small diameter portion.

[0014] In the above-mentioned sealing device for an internal mixer, the pressure cover includes a third small diameter portion and a third large diameter portion, a third positioning step is formed between the third small diameter portion and the third large diameter portion, the third small diameter portion is sleeved on the rotating shaft, the end portion of the static sealing ring corresponding to the third large diameter portion is arranged in the inner cavity of the third large diameter portion, and the positioning hole and the oil inlet hole are arranged on the side of the third positioning step.

[0015] The outstanding advantages of the present invention compared with the prior art are:

[0016] 1. The present invention forms a labyrinth seal structure by connecting a plurality of convex rings and grooves, thereby extending the leakage path of the material and achieving the purpose of preventing material leakage. The sealing effect is good, which can effectively prevent material leakage and reduce material waste;

[0017] 2. The present invention firstly fixes the gland and the static sealing ring with bolts, and then fixes the gland and the outer wall of the mixing chamber, so that the static sealing ring is pressed toward the dynamic sealing ring by the gland, and is in contact with the dynamic sealing ring to form an end face seal;

[0018] 3. The present invention lubricates and seals between the dynamic seal ring and the static seal ring, between the static seal ring and the rotating shaft, and between the static seal ring and the gland through lubricating oil, thereby reducing the wear of the dynamic seal ring, the static seal ring and the rotating shaft and increasing their service life. Description of the drawings:

[0019] Figure 1 It is an overall cross-sectional schematic diagram of the present invention;

[0020] Figure 2 is a schematic cross-sectional view of the side wall of the mixing chamber of the present invention;

[0021] Figure 3 is a schematic cross-sectional view of a static sealing ring of the present invention;

[0022] Figure 4 yes Figure 3 A partial enlarged view of;

[0023] Figure 5 It is a schematic cross-sectional view of the gland of the present invention.

[0024] In the figure: 1. mixing chamber; 2. rotor; 3. rotating shaft; 4. dynamic sealing ring; 5. static sealing ring; 6. pressure cover; 7. groove; 8. convex ring; 9. mounting hole; 10. positioning hole; 11. first small diameter portion; 12. first large diameter portion; 13. axial oil lubrication hole; 14. oil inlet hole; 15. radial oil lubrication hole; 16. second small diameter portion; 17. second large diameter portion; 18. third small diameter portion; 19. third large diameter portion. Specific implementation method:

[0025] The present invention is further described below with reference to specific embodiments. Figure 1 —5:

[0026] A sealing device for an internal mixer includes an internal mixer chamber 1 and a rotor 2, a rotating shaft 3 is provided at the end of the rotor 2, a bearing hole is provided on the side wall of the internal mixer chamber 1, a dynamic sealing ring 4, a static sealing ring 5 and a gland 6 are sequentially sleeved on the rotating shaft 3 away from the rotor 2, the dynamic sealing ring 4 and the static sealing ring 5 are arranged in the inner cavity of the bearing hole, and the dynamic sealing ring 4 is contacted and connected with the end face of the rotor 2, the gland 6 is fixedly connected to the outer side wall of the internal mixer chamber 1 by fasteners, and the gland 6 is also fixedly connected to the static sealing ring 5 by fasteners, and the outer side wall of the internal mixer chamber 1 is provided with more than two annular grooves 7 with the center point of the bearing hole as the center of the circle, and the gland 6 is provided with a convex ring 8 adapted to the groove 7. In this embodiment, three grooves 7 are provided, and the convex ring 8 is connected with the groove 7 by clamping to form a labyrinth sealing structure. By increasing the number of grooves 7 and convex rings 8, the leakage path of the material is extended, thereby achieving the purpose of preventing material leakage.

[0027] Furthermore, the cross section of the groove 7 is a rectangular or trapezoidal structure. In this embodiment, the cross section of the groove 7 is a rectangular structure, which has a good path extension effect and can apply radial resistance to the material in the gap between the groove 7 and the convex ring 8 to prevent the material from leaking outward.

[0028] In order to make the pressure cover 6 fixedly connected to the outer wall of the mixing chamber 1 and prevent the gap between the groove 7 and the convex ring 8 from increasing when the material is squeezed outward, the specific structure in which the pressure cover 6 is fixedly connected to the outer wall of the mixing chamber 1 by fasteners is: more than three mounting holes 9 are provided on the outer edge of the pressure cover 6 and are evenly distributed circumferentially around the center of the pressure cover 6, and the pressure cover 6 is fixedly connected to the outer wall of the mixing chamber 1 by bolts passing through the mounting holes 9.

[0029] In order to ensure the stability of the static sealing ring 5, the gland 6 is also fixedly connected to the static sealing ring 5 by fasteners. The gland 6 is provided with more than two positioning holes 10 evenly distributed circumferentially around the center of the gland 6. The gland 6 is fixedly connected to the corresponding end faces of the static sealing ring 5 by bolts passing through the positioning holes 10.

[0030] In the process of the gland 6 being fixedly connected to the outer wall of the mixing chamber 1 by bolts, the static sealing ring 5 is pressed toward the dynamic sealing ring 4 by the gland 6, so that the static sealing ring 5 is in contact with the dynamic sealing ring 4 to form an end face seal. Therefore, in the assembly process of the present invention, the gland 6 should be fixedly connected to the static sealing ring 5 by bolts first, and then the gland 6 should be fixedly connected to the outer wall of the mixing chamber 1 by bolts. If the assembly process is reversed, the static sealing ring 5 is pulled toward the gland 6 by the bolts during the process of the gland 6 being fixedly connected to the static sealing ring 5, so that the static sealing ring 5 and the dynamic sealing ring 4 cannot form an end face seal.

[0031] In order to prevent the material from leaking outward from the gap between the dynamic seal ring 4 and the bearing hole, the specific structure of the dynamic seal ring 4 and the static seal ring 5 arranged in the inner cavity of the bearing hole is: the bearing hole includes a first small diameter portion 11 and a first large diameter portion 12, a first positioning step is formed between the first small diameter portion 11 and the first large diameter portion 12, the dynamic seal ring 4 is arranged in the inner cavity of the first small diameter portion 11, the static seal ring 5 is arranged in the inner cavity of the first large diameter portion 12, and the outer diameter of the static seal ring 5 is greater than the outer diameter of the dynamic seal ring 4. The purpose of preventing material leakage is achieved by extending the leakage path of the material.

[0032] Because the dynamic seal ring 4 rotates relative to the static seal ring 5 driven by the rotating shaft 3, and the dynamic seal ring 4 is in contact with the static seal ring 5, in order to reduce the wear of the dynamic seal ring 4 and the static seal ring 5, an axial oil hole 13 is provided on the side where the static seal ring 5 and the dynamic seal ring 4 are in contact, and the gland 6 is provided with an oil inlet hole 14 corresponding to the position of the axial oil hole 13, and the oil inlet hole 14 and the axial oil hole 13 form a lubricating oil injection channel. Under the action of the lubricating oil, the lubrication effect between the dynamic seal ring 4 and the static seal ring 5 can be effectively increased. At the same time, the lubricating oil can form a paste with the material in the gap between the gland 6 and the static seal ring 5 and between the static seal ring 5 and the dynamic seal ring 4, which can prevent the leakage of material powder.

[0033] Furthermore, a radial lubrication hole 15 is provided on the inner wall surface of the static seal ring 5, and the radial lubrication hole 15 is connected to the axial lubrication hole 13. Lubricating oil lubricates the static seal ring 5 and the rotating shaft 3 through the radial lubrication hole 15, reducing the wear of the static seal ring 5 and the rotating shaft 3.

[0034] In order to prevent the gap between the dynamic sealing ring 4 and the static sealing ring 5 from increasing due to the outward extrusion of the material, resulting in the leakage of lubricating oil and causing waste, the static sealing ring 5 includes a second small diameter portion 16 and a second large diameter portion 17, and a second positioning step is formed between the second small diameter portion 16 and the second large diameter portion 17. The second small diameter portion 16 is sleeved on the rotating shaft 3, and the dynamic sealing ring 4 is arranged in the inner cavity of the second large diameter portion 17, and its end face is in contact with the second positioning step. The axial oil lubrication hole 13 is arranged on the side of the second positioning step, and the radial oil lubrication hole 15 is arranged on the inner wall surface of the second small diameter portion 16.

[0035] In order to prevent the gap between the pressure cover 6 and the static sealing ring 5 from increasing due to the outward squeezing of the material, resulting in the leakage of lubricating oil and causing waste, the pressure cover 6 includes a third large diameter portion 19 and a third large diameter portion, and a third positioning step is formed between the third large diameter portion 19 and the third large diameter portion. The third large diameter portion 19 is sleeved on the rotating shaft 3, and the end of the static sealing ring 5 corresponding to the third large diameter portion is arranged in the inner cavity of the third large diameter portion, and the positioning hole 10 and the oil inlet hole 14 are arranged on the side of the third positioning step.

[0036] The above embodiment is only one of the preferred embodiments of the present invention, and is not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes made based on the shape, structure, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A sealing device for an internal mixer, comprising an internal mixer chamber (1) and a rotor (2), wherein a rotating shaft (3) is provided at the end of the rotor (2), and a bearing hole is provided on the side wall of the internal mixer chamber (1), characterized in that: The rotating shaft (3) is sleeved with a dynamic sealing ring (4), a static sealing ring (5) and a pressure cover (6) in sequence away from the rotor (2); the dynamic sealing ring (4) and the static sealing ring (5) are arranged in the inner cavity of the bearing hole, and the dynamic sealing ring (4) is in contact with the end surface of the rotor (2); the pressure cover (6) is fixedly connected to the outer wall of the mixing chamber (1) by fasteners; the pressure cover (6) is also fixedly connected to the static sealing ring (5) by fasteners; the outer wall of the mixing chamber (1) is provided with two or more annular grooves (7) at intervals with the center point of the bearing hole as the center of the circle; and the pressure cover (6) is provided with a convex ring (8) adapted to the groove (7); The cross section of the groove (7) is rectangular or trapezoidal; The specific structure of the dynamic sealing ring (4) and the static sealing ring (5) being arranged in the inner cavity of the bearing hole is as follows: the bearing hole comprises a first small diameter portion (11) and a first large diameter portion (12), a first positioning step is formed between the first small diameter portion (11) and the first large diameter portion (12), the dynamic sealing ring (4) is arranged in the inner cavity of the first small diameter portion (11), the static sealing ring (5) is arranged in the inner cavity of the first large diameter portion (12), and the outer diameter of the static sealing ring (5) is greater than the outer diameter of the dynamic sealing ring (4); An axial oil lubrication hole (13) is provided through the side surface of the static seal ring (5) and the dynamic seal ring (4) where they are in contact, and an oil inlet hole (14) corresponding to the position of the axial oil lubrication hole (13) is provided on the gland (6), and the oil inlet hole (14) and the axial oil lubrication hole (13) form a lubricating oil injection channel; A radial oil lubrication hole (15) is provided on the inner wall surface of the static sealing ring (5), and the radial oil lubrication hole (15) is in communication with the axial oil lubrication hole (13) through a pipeline; The static sealing ring (5) comprises a second small diameter portion (16) and a second large diameter portion (17), a second positioning step is formed between the second small diameter portion (16) and the second large diameter portion (17), the second small diameter portion (16) is sleeved on the rotating shaft (3), the dynamic sealing ring (4) is arranged in the inner cavity of the second large diameter portion (17), and its end face is in contact with and connected to the second positioning step, the axial lubricating hole (13) is arranged on the side surface of the second positioning step, and the radial lubricating hole (15) is arranged on the inner wall surface of the second small diameter portion (16); The pressure cover (6) includes a third small diameter portion (18) and a third large diameter portion (19), a third positioning step is formed between the third small diameter portion (18) and the third large diameter portion (19), the third small diameter portion (18) is sleeved on the rotating shaft (3), the end portion of the static sealing ring (5) corresponding to the third large diameter portion (19) is arranged in the inner cavity of the third large diameter portion (19), and the positioning hole (10) and the oil inlet hole (14) are arranged on the side of the third positioning step.

2. A sealing device for an internal mixer according to claim 1, characterized in that: The specific structure in which the gland (6) is fixedly connected to the outer wall of the mixing chamber (1) by fasteners is as follows: the outer edge of the gland (6) is provided with more than three mounting holes (9) evenly distributed in the circumferential direction around the center of the gland (6); the gland (6) is fixedly connected to the outer wall of the mixing chamber (1) by bolts passing through the mounting holes (9).

3. A sealing device for an internal mixer according to claim 1, characterized in that: The gland (6) is also fixedly connected to the static sealing ring (5) by fasteners. The gland (6) is provided with two or more positioning holes (10) evenly distributed around the center of the gland (6). The gland (6) is fixedly connected to the corresponding end faces of the static sealing ring (5) by bolts passing through the positioning holes (10).

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