JP7044427B1 - Sealing device for sealed kneader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing device of a sealing type kneader capable of reducing the amount of lubricating oil to be lubricated on a sealing surface and reducing wear of a ring. A seal of a sealed kneader having a rotor (2) provided with a wing portion (20) on a rotor shaft (2) and an annular end plate (26) into which the rotor shaft is inserted into an inner hole. In the device (1), the rotating ring (3) attached to the end surface of the wing portion of the rotor is fitted in the axial direction of the rotor shaft between the inner peripheral surface of the end plate and the outer peripheral surface of the rotor shaft. An annular fixing ring (4) pressed against the end face of the rotating ring is provided, a sealing surface (5) is formed between the rotating ring and the cylinder portion of the fixing ring, and the fixing ring is provided on the flange portion. 1 water channel, a second water channel provided near the other end of the cylinder on the seal surface side, a connecting passage provided in the cylinder to connect the first water channel and the second water channel, and a seal provided in the cylinder. The surface has a lubrication hole for lubricating lubricating oil. [Selection diagram] Fig. 1

Description

The present invention relates to a sealing device for a sealed kneader. More specifically, the present invention relates to a device for preventing the kneaded material kneaded inside the sealed kneader from leaking to the outside.

A batch-type closed kneader that kneads materials to be kneaded such as rubber and plastic has a housing with a kneading chamber inside and a pair of rotors provided inside this housing and supported rotatably. I have. This closed kneading machine is configured to knead the material to be kneaded such as rubber and plastic pressed into the kneading chamber with a pair of rotatable rotors, and to take out the kneaded material in the desired kneaded state to the outside. There is. The housing provided with the kneading chamber (hollow portion) is supported by the frame member. Further, in the pair of rotors, the main body portion for kneading the material to be kneaded is housed in the kneading chamber, and the shaft portions protruding from both end faces of the main body portion are arranged so as to project outward via the frame member. There is. Since the main body rotates, a predetermined gap is provided between the end surface of the main body of the rotor housed in the kneading chamber and the frame member. That is, the kneading chamber is in a state of communicating with the outside through the gap. A sealing device is provided between the end face of the main body of the rotor housed in the kneading chamber and the frame member so that so-called dust including the kneaded material does not leak to the outside.

In Patent Document 1 (Japanese Patent Laid-Open No. 61-29467), as a sealing device, a shaft between an annular end plate in which the flange end surface of the rotor takes in the rotor shaft, an outer peripheral surface of the rotor shaft, and a peripheral surface without an end plate. Disclosed is a crimp-type dust stop assembly (seal device) of a kneader with an annular dust stop ring that is directionally fitted, pressed against the flange end face via a yoke, and detented. .. In the kneading machine described in Patent Document 1, the dust stop ring is divided into two parts, the first ring and the second ring, and the divided end faces thereof are freely assembled. A conduction jacket for cooling water is formed on the outer peripheral surfaces of the first ring and the second ring in the circumferential direction, respectively, and a communication pipe for communicating the conduction jacket is provided. A cooling water supply pipe is connected to one of the conduction jackets, and a cooling water discharge pipe is connected to the other. Further, each of the first ring and the second ring is formed with a lubricating hole in the axial direction for sending lubricating oil to the sliding contact portion with the flange end surface.

Jitsukosho 61-29467 Gazette

As described in Patent Document 1, the sealing device of the sealing type kneader includes an annular dust stop ring (in the following description, this annular dust stop ring is referred to as a fixing ring). Further, in the sealing device of the sealing type kneader, a rotating ring provided on the rotor shaft and forming a sealing surface with the fixing ring is provided. Due to the frictional heat generated on the sealing surface where the rotating ring and the fixing ring come into contact with each other, the temperature of the fixing ring may rise, causing thermal deformation of the fixing ring. Further, the contact surface of the sliding surface (sealing surface) may not be uniformly contacted due to the thermal deformation of the fixing ring, and the sealing property of the kneaded product may be deteriorated. In order to prevent thermal deformation of the fixing ring and deterioration of the sealing property of the sealing surface in this way, in the sealing device of the sealing type kneader disclosed in Patent Document 1, a water channel is provided on the outer periphery of the dust stop ring (fixing ring). , Cooling water is passed through this water channel to cool the fixing ring. However, the water channel provided in the fixing ring is the outer circumference of the fixing ring and is installed at the outermost position farthest from the sealing surface.

On the other hand, the frictional heat generated on the sealing surface where the rotating ring and the fixing ring come into contact raises the temperature of the lubricating oil (sliding surface oil) lubricated on the sealing surface. At this time, the temperature of the lubricating oil forming the oil film on the sealing surface becomes high, and the viscosity of the lubricating oil is extremely lowered due to the nature of the lubricating oil. As a result, the film thickness (oil film thickness) of the oil film of the lubricating oil becomes thin, and the rotating ring and the fixing ring come into metal contact with each other on the sealing surface, and the wear is accelerated.

In order to prevent a decrease in the oil film thickness due to an increase in the temperature of the sealing surface, the amount of lubricating oil lubricated to the sealing surface can be increased, thereby thickening the oil film and preventing wear due to metal contact. However, the amount of lubricating oil for thickening the oil film is considerably large.

According to the inventor's knowledge, it is important to control the temperature of the lubricating oil on the sealing surface in order to maintain the oil film on the sealing surface at a predetermined thickness. That is, by maintaining (or cooling) the temperature of the lubricating oil at a predetermined temperature, the thickness of the oil film on the sealing surface can be maintained at a predetermined thickness, whereby the amount of lubricating oil to be lubricated on the sealing surface can be maintained. Was found to be able to be reduced.

In the sealing device of the sealed kneader disclosed in Patent Document 1, the water channel provided in the fixing ring is the outer periphery of the fixing ring and is installed at the outermost position farthest from the sealing surface. Therefore, although the fixing ring is cooled to some extent, it is difficult to reduce the temperature of the sealing surface. Furthermore, it has been more difficult to reduce the temperature of the lubricating oil lubricated on the sealing surface. Therefore, in order to prevent wear due to metal contact, it was necessary to lubricate the sealing surface with a large amount of lubricating oil.

What is required is to enable control of the temperature of the sealing surface and the temperature of the lubricating oil to be lubricated to the sealing surface, thereby reducing the amount of lubricating oil to be lubricated to the sealing surface and wear of the fixing ring or rotating ring. It is to provide a sealing device for a sealed kneader capable of achieving both prevention.

The sealing device of the sealed kneader according to the present invention is a sealing device of a sealed kneader provided with a rotor having a wing portion on the rotor shaft and an annular end plate into which the rotor shaft is inserted into an inner hole. The rotary ring attached to the end surface of the wing portion of the rotor is fitted in the axial direction of the rotor shaft between the inner peripheral surface of the end plate and the outer peripheral surface of the rotor shaft, and is pressed against the end surface of the rotary ring. It is equipped with an annular fixing ring. The fixing ring has a flange portion and a tubular portion having one end connected to the flange portion and extending in the axial direction. Further, a sealing surface is formed between the rotating ring and the tubular portion of the fixing ring. Further, the fixing ring is provided in the first water channel provided in the flange portion, the second water channel provided in the vicinity of the other end of the cylinder portion on the sealing surface side, and the first cylinder portion. It is characterized by having a connecting passage connecting the water channel and the second water channel, and a lubrication hole portion provided in the cylinder portion and for lubricating the lubricating oil on the sealing surface.

In the sealing device of the sealing type kneader according to the present invention, the fixing ring is provided with a second water channel in the vicinity of the other end on the sealing surface side of the cylinder portion in addition to the first water channel provided in the flange portion. Since the connecting passage connecting the 1st water channel and the 2nd water channel is provided in the tubular portion, the temperature of the lubricating oil to be lubricated on the sealing surface can be suitably cooled or adjusted. As a result, it is possible to maintain the oil film thickness at a predetermined size and prevent wear of the fixing ring or the rotating ring without increasing the amount of lubricating oil to be lubricated.

Further, in the sealing device of the sealing type kneader according to the present invention, the second water channel of the fixing ring includes one or more branch water channels extending in the circumferential direction, and the branch water channels are substantially coaxial with each other. It may be characterized by being arranged in parallel in the direction . As a result, the sealing surface to which the lubricating oil is lubricated is cooled or adjusted more effectively.

Further, in the sealing device of the sealing type kneader according to the present invention, a part of the connecting passage may be arranged in the vicinity of the lubrication hole portion extending in the axial direction. By arranging a part of the connecting passage in the vicinity of the lubrication hole extending in the axial direction, the temperature of the lubricating oil flowing through the lubrication hole can be suitably cooled or adjusted.

Further, in the sealing device of the sealing type kneader according to the present invention, the second water channel has a lubricating oil having a predetermined thickness on the sealing surface by adjusting the temperature of the lubricating oil lubricated on the sealing surface. It may be characterized in that it is configured to form an oil film of. Since the sealing surface is configured to form an oil film of lubricating oil having a predetermined thickness, it is possible to prevent wear of the fixing ring or the rotating ring without increasing the amount of lubricating oil to be lubricated. ..

In the sealing device of the sealing type kneader according to the present invention, the fixing ring is provided with a second water channel in the vicinity of the other end of the cylinder portion on the sealing surface side together with the first water channel provided in the flange portion, and the first water channel is provided. Since the connecting passage connecting the water channel and the second water channel is provided in the tubular portion, the temperature of the lubricating oil to be lubricated on the sealing surface can be suitably cooled or adjusted. As a result, it is possible to maintain the oil film thickness at a predetermined size and prevent wear of the fixing ring or the rotating ring without increasing the amount of lubricating oil to be lubricated.

FIG. 1 is a diagram schematically showing a cross-sectional view of a sealing device of a sealing type kneader according to the present embodiment. FIG. 2 is a diagram schematically showing a fixing ring of the sealing device according to the present embodiment. FIG. 3 is a diagram in which the number of connecting passages according to the present embodiment is changed. FIG. 4 is a diagram schematically showing a processing method of the fixing ring of the present embodiment. FIG. 5 is a diagram showing a temperature change of the sealing surface of the sealing device according to the present embodiment. FIG. 6 is a diagram schematically showing the flow of lubrication to the sealing surface. FIG. 7 is a graph showing the relationship between the temperature and the viscosity of the lubricating oil in general. FIG. 8 is a graph showing the relationship between the temperature and the oil film thickness with respect to the oil film of the lubricating oil on the sealing surface. FIG. 9 is a graph showing the relationship between the temperature of the sealing surface and the amount of lubrication. FIG. 10 is a diagram schematically showing a cross-sectional view of a sealed kneader as viewed from a plane. FIG. 11 is a diagram schematically showing a cross-sectional view of a sealing device of a comparative example. FIG. 12 is a diagram schematically showing a fixing ring of a sealing device of a comparative example.

The sealing device of the sealed kneader according to some embodiments will be described below with reference to the drawings. In the following description, the same elements are designated by the same reference numerals in the description of the drawings.

FIG. 1 schematically shows a cross-sectional view of a sealing device 1 used in the sealed kneader according to the present embodiment. Before explaining the sealing device 1, first, the configuration of the sealing type kneader provided with the sealing device according to the present embodiment will be briefly described. FIG. 10 schematically shows a sealed kneader 17 provided with a sealing device according to the present embodiment. As shown in FIG. 10, the sealed kneader 17 according to the present embodiment is a batch type closed kneader for kneading materials to be kneaded such as rubber and plastic. The closed kneader 17 is composed of a housing 19, a kneading chamber side surface 6, and a pair of rotating rotors 2 having wings 20. The rotor 2 has a rotor shaft 27 and a wing portion 20 provided on the rotor shaft 27. The housing 19 has a kneading chamber 13 inside. A pair of rotors 2 are provided in the kneading chamber 13. The closed kneader 17 has a structure in which a material to be kneaded such as rubber or plastic pressed into the kneading chamber 13 is kneaded by the blades 20 of the pair of rotors 2, and the kneaded material in a desired kneaded state is taken out to the outside. It has become.
A predetermined space required for the blade portion 20 to rotate is formed between the end surface of the blade portion 20 of the rotor 2 and the side surface 6 of the kneading chamber. That is, the kneading chamber 13 is in a state of communicating with the outside through the space. However, when the kneading chamber 13 and the outside are in a communicating state, there is a captive that the kneaded material in the kneading chamber 13 leaks from the space to the outside. Therefore, conventionally, the space is provided with a sealing device for preventing the kneaded material in the kneading chamber 13 from leaking to the outside. In the present embodiment, a pair of rotors 2 are provided, one sealing device 101 is formed on each of the left and right sides of each rotor 2, and four sealing devices 101 are formed as a whole.

Referring to FIG. 1 again, the sealing device 1 has a rotating ring 3 fitted in the end face of the blade portion 20 of the rotor and a fixing ring 4 fitted in the axial direction of the rotor shaft 27 in order to seal the kneading chamber 13. It is equipped with. Further, an annular end plate 26 having an inner hole for inserting a rotor shaft is provided on the side surface 6 of the kneading chamber. The fixing ring 4 has an annular shape and is attached to the end surface of the wing portion 20 of the rotor 2. Further, the fixing ring 4 is fitted between the inner peripheral surface of the end plate 26 and the outer peripheral surface of the rotor shaft 27 in the axial direction of the rotor shaft 27, and is pressed against the end surface of the rotating ring 3. A sealing member such as packing is provided between the fixing ring 4 and the inner peripheral surface of the end plate 26. The rotating ring 3 and the fixing ring 4 are arranged so as to be in surface contact with each other, and a sealing surface 5 is formed on the contact surface between the rotating ring 3 and the fixing ring 4. When the rotor 2 rotates, it slides on the sealing surface 5 of the sealing device 1. Further, a yoke 11 for pressing the fixing ring 4 toward the sealing surface 5 is provided.

In the present embodiment, the yoke 11 is connected to a hydraulic cylinder (not shown), and the pressing pin 12 attached to the yoke 11 by hydraulic pressure uses the hydraulic cylinder to seal the fixing ring 4 to the sealing surface 5. It is pressed to the side to prevent the material to be kneaded such as rubber in the kneading chamber 2 from leaking to the outside. Lubricating oil (sliding surface oil) is lubricated to the sealing surface 5 where the rotating ring 3 and the fixing ring 4 come into contact with each other through the lubrication hole 8 in the fixing ring 4. The lubricating oil is lubricated to the sealing surface through the lubrication pipe 28 in a high pressure state in the range of, for example, 1 MPa to 18 MPa by the lubrication pump provided in the high pressure lubricator 7. Further, a gap portion is provided between the rotor shaft and the fixing ring 4, and the lubricating oil is configured to be discharged to the outside through the gap portion.

The temperature of the material to be kneaded, such as rubber in the kneading chamber 2, becomes high during kneading, and the heat is transferred to the sealing surface 5, and the temperature of the fixing ring 4 also rises due to the frictional heat of the sealing surface 5 itself. Therefore, a first water channel 9 for cooling the fixing ring 4 is installed. Cooling water is supplied to the first water channel 9 from the cooling water circulation mechanism 10.

Next, the influence of the temperature rise that occurs on the sealing surface 5 will be described in detail. In the sealing device 1 so far, the influence of the temperature rise generated on the sealing surface 5 has been studied on the temperature rise of the fixing ring 4, the expansion due to the temperature rise, or the decrease in mechanical accuracy. However, according to the inventor's knowledge, the influence of the temperature rise generated on the sealing surface 5 is not limited to the temperature rise of the fixing ring 4, but the rotating ring 3 or the fixing ring 4 forming the sealing surface 5 is affected. It has been found that it greatly affects wear.

In the sealing device 1, lubricating oil is lubricated to the sealing surface 5 in order to reduce wear of the rotating ring 3 or the fixing ring 4. Normally, since a metal material that is hard to wear is used for the rotating ring 3, the influence of wear is small, but on the other hand, the wear of the fixing ring 4 is remarkable as compared with the rotating ring. So far, empirically, the degree of wear of the fixing ring 4 or the rotating ring 3 has been adjusted by the amount of lubricating oil. For example, when about 100 tons of rubber is kneaded as a material to be kneaded, it is necessary to supply a large amount of lubricating oil in order to prevent wear of the fixing ring 4 or the rotating ring 3. Normally, the amount of lubricating oil supplied is about 150 liters.

Next, the relationship between the temperature rise of the lubricating oil due to the temperature rise that occurs on the sealing surface 5 and the wear of the fixing ring 3 or the rotating ring 4 will be described.

FIG. 7 shows a diagram for explaining the relationship between the temperature and the viscosity of the lubricating oil. FIG. 8 shows a diagram for explaining the relationship between the temperature of the lubricating oil and the oil film thickness. As shown in FIG. 7, as the temperature of the lubricating oil rises, the viscosity of the lubricating oil decreases. Further, as shown in FIG. 8, as the temperature of the lubricating oil rises, the viscosity of the lubricating oil decreases, so that the film thickness of the oil film of the lubricating oil decreases. For example, it was found that when the temperature of the lubricating oil rises from 55 ° C to 75 ° C, the thickness of the oil film decreases by about 1.35 μm from about 4.1 μm to 2.75 μm at a certain lubrication amount setting. .. It was also found that the viscosity sharply increased when the temperature of the lubricating oil was less than 60 ° C.

When the thickness of the oil film of the lubricating oil is reduced, the friction reducing effect of the lubricating oil is reduced, so that the rotating ring 3 or the fixing ring 4 on the sealing surface 5 is significantly worn. On the other hand, by suppressing the temperature rise of the lubricating oil and controlling it to a predetermined temperature, the thickness of the oil film of the lubricating oil can be maintained at a predetermined thickness, so that the sealing surface can be maintained without supplying a large amount of lubricating oil to the sealing surface. It was found that the wear of the rotating ring 3 or the fixing ring 4 in No. 5 can be effectively reduced.

11 and 12 show a sealing device 101 provided with only the first channel 9 in the fixing ring 4 for comparison. In the sealing device 101, in order to cool the fixing ring, the first water channel 9 is installed at the position of the flange portion 21 away from the sealing surface 5. In the sealing device 1 of the present embodiment, the fixing ring 4 is combined with the first water channel 9 for the purpose of cooling the lubricating oil supplied to the sealing surface 5 together with the cooling of the fixing ring 4. It is provided in. Next, the fixing ring 4 of the present embodiment will be described in detail.

In the sealing device 101, the first water channel 9 is installed at a distance of about 75 mm from the sealing surface 5. Therefore, the heat conduction from the sealing surface 5 to the first water channel 9 is low, and the ability to cool the sealing surface 5 is weak. As a result, the temperature of the lubricating oil on the sealing surface 5 is relatively high at 70 to 75 ° C. It is important to keep the temperature of the sealing surface 5 below 60 ° C. in order to reduce the amount of lubricating oil. In the sealing device 1 of the present embodiment, the second water channel 14 is provided at a position 10 mm away from the sealing surface 5 of the fixing ring 4. A cooling water connecting passage 15 that links the first water channel 9 and the second water channel 14 is installed. As a result, the cooling water that has entered the first water channel 9 enters the second water channel 14 through the inlet of the cooling water connecting passage 15, and returns to the first water channel 9 through the separately provided cooling water connecting passage 15 outlet. The heat conduction from the surface 5 to the second water channel 14 is improved, and the sealing surface 5 can be cooled within the target temperature. FIG. 5 is a graph showing the temperature change of the sealing surface 5 of the present embodiment. According to this embodiment, it was confirmed that the fixing ring 4 has an effect of lowering the temperature by about 10 to 20 ° C. and cooling as compared with the sealing device 101 provided with only the first water channel 9.

FIG. 2 shows a schematic view of the fixing ring 4. FIG. 2A schematically shows a front view of the fixing ring 4, and FIG. 2B schematically shows a cross-sectional view cut out along the line AA of FIG. 2A. It is shown in. As shown in FIG. 2A, the fixing ring 4 is connected to a cylindrical portion having a cylindrical shape and has a flange portion 21 provided on the opposite side of the sealing surface 5. It includes a first water channel 9 provided along the outer periphery and a second water channel 14 connected to the first water channel 9 and provided along the inner circumference inside the first water channel 9. Further, the first water channel 9 and the second water channel 14 are connected by a connecting passage 15.

When the sealing surface 5 of the fixing ring 4 is worn, it is necessary to remove and replace the fixing ring 4 from the sealing device 1. In the present embodiment, as shown in FIG. 2A, the fixing ring 4 is formed by being divided into upper and lower parts so that the fixing ring 4 can be easily attached to and detached from the sealing device 1 and replaced. .. Therefore, the first water channel 9 is provided in each of the upper and lower fixing rings 4. Further, each of the upper and lower fixing rings 4 is provided with a lubrication hole portion 8 for supplying lubricating oil. Since it is necessary to uniformly supply the lubricating oil to the sealing surface 5, the lubrication holes 8 are provided at substantially the same intervals in the circumferential direction of the fixing ring 4. Therefore, since it is necessary to provide the second water channel 14 while avoiding the lubrication hole portion 8, the second water channel 14 is provided on the left and right sides of the lower fixing ring 4 with the lubrication hole portion 8 interposed therebetween. Further, each second water channel 14 is formed with a connecting passage 15 for connecting to the first water channel 9. Further, each first water channel 9 is provided with an inlet portion for supplying cooling water from the outside to the first water channel 9 and an outlet for discharging the cooling water from the water channel 9 to the outside.

Further, in the present embodiment, the lubrication holes 8 are provided at two locations on the upper fixing ring 4 and one location on the lower fixing ring 4 at substantially the same intervals in the circumferential direction of the fixing ring 4, for a total of three locations. It is provided. Further, a thermometer for measuring the temperature of the sealing surface 5 is incorporated via a thermometer hole 16 formed in the lower fixing ring 4. As the thermometer, for example, a thermocouple or the like can be used.

Further, FIG. 2B schematically shows a cross-sectional view cut out along the line AA of FIG. 2A. As shown in FIG. 2B, in the present embodiment, the fixing ring 4 can have a cylindrical shape having a flange portion 21 on the opposite side of the sealing surface 5. The fixing ring 4 is provided with a first water channel 9, a second water channel 14, and a connecting passage 15 (15a, 15b in FIG. 2) for cooling the fixing ring 4. The first water channel 9 can be provided in the flange portion 21 of the fixing ring 4. Further, the second water channel 14 can be provided in the vicinity of the sealing surface 5. The connecting passage 15 (15a, 15b in FIG. 2) is branched from the first water channel 9, is formed between the first water channel 9 and the second water channel 14, and extends in the extending direction of the fixing ring 4, and is the first. The water channel 9 and the second water channel 14 are connected. The first water channel 9 has a structure in which the cross-sectional area changes with the branch portion of the connecting passage 15 as a boundary. The cross-sectional area of the first water channel 9 including the branch portion of the connecting passage 15a from the cooling water inlet and the cross-sectional area of the first water channel 9 including the cooling water outlet including the branch portion of the connecting passage 15b are almost the same and have the same width. The depth is about 20 mm and the depth is about 17 mm. On the other hand, the cross-sectional area of the first water channel 9 between the bifurcation of the connecting passage 15a and the bifurcation of the connecting passage 15b is designed so that, for example, the cross-sectional area of the connecting passage 15 is reduced. Specifically, the width of the water channel is about 20 mm, and the structure is such that the depth of the water channel is reduced and adjusted in order to reduce the cross-sectional area. Thereby, the amount of cooling water or the distribution ratio of the cooling water supplied from the cooling water inlet can be adjusted to be distributed to the first water channel 9 and the connecting passage 15 branching from the first water channel 9.

Further, the lower ring of the fixing ring 4 is also composed of the first water channel 9, the connecting passage 15 (15c, 15d, 15e, 15f in FIG. 2) and the second water channel 14 in the same manner as the upper ring. The cross-sectional area of the first water channel 9 of the lower ring has a structure that changes in the same manner as the upper ring. The cross-sectional area of the first water channel 9 between the branch portion of the connecting passage 15c and the branch portion of the connecting passage 15d and the cross-sectional area of the first water channel 9 between the branch portion of the connecting passage 15e and the branch portion of the connecting passage 15f are the connecting passages. The structure is such that the cross-sectional area equivalent of 15 is reduced, the width of the water channel is 20 mm, and the reduction corresponding to the cross-sectional area is adjusted by reducing the depth of the water channel.

By providing the second water channel 14 in the vicinity of the sealing surface 5, the fixing ring 4 can be cooled and the sealing surface 5 can be effectively cooled. In FIG. 2B, the distance from the sealing surface 5 to the second water channel 14 in the extending direction of the fixing ring 4 is preferable because the smaller the distance, the more effectively the sealing surface can be cooled. In addition, since there is a possibility of affecting the sealing surface, the minimum distance from the sealing surface 5 to the second water channel 14 can be set to about 5 mm. On the other hand, if the distance from the sealing surface 5 to the second water channel 14 is increased, the sealing surface 5 may not be sufficiently cooled. Therefore, the maximum distance from the sealing surface 5 to the second water channel 14 is set to about 40 mm. Is desirable. In the present embodiment, the distance from the sealing surface 5 to the second water channel 14 can be about 10 mm to 20 mm.

Further, the connecting passage 15 (connecting passages 15a and 15b) for connecting the first water channel 9 and the second water channel 14 has a hole structure having a substantially circular cross-sectional shape. The diameter of the connecting passage 15 can be about 8 mm.

In the sealing device 1 of the present embodiment, for example, the connecting passage 15a (15a, 15b in FIG. 2) of the connecting passage inlet 15a and the connecting passage outlet 15b connecting the first water channel 9 and the second water channel 14 to the upper ring is used. ) Is provided. However, the present invention is not limited to this, and a plurality of connecting passages 15 may be provided as shown in FIG. 3B, the connecting passage inlets 15a and 15g, and the connecting passage outlets 15b and 15h. As a result, the degree of freedom for adjusting the amount of cooling water supplied to the second water channel is improved, and the sealing surface 5 can be cooled more efficiently.

Referring to FIG. 2A, lubrication holes 8 (8a, 8b, 8c) are provided in the vicinity of the connecting passage 15 (15a, 15b, 15c, 15d, 15e, 15f). That is, the lubrication hole portion 8 is formed in the vicinity of the connecting passage 15 along the extending direction of the connecting passage 15. As a result, the cooling water supplied to the connecting passage 15 via the first water passage 9 can cool the lubricating oil flowing in the lubrication hole portion 8 provided in the vicinity of the connecting passage 15. As a result, the temperature of the lubricating oil supplied to the sealing surface 5 can be reduced, so that the temperature of the lubricating oil on the sealing surface 5 can be controlled within a predetermined range.

In FIGS. 2A, 2B, and 2C, the cooling water for cooling the fixing ring 4 is supplied from the outside to the first water channel 9 of the fixing ring 4. After that, it is branched from the first water channel 9, flows to the second water channel 14 through the connecting passage 15, and returns to the first water channel 9 through the connecting passage 15. In the present embodiment, the cooling water supplied to the first water channel 9 is branched from the first water channel 9 at the connecting passage 15a. Since the cross-sectional area of the branched first water channel 9 is reduced by the amount corresponding to the cross-sectional area of the connecting passage 15, the amount of cooling water is appropriately distributed according to the cross-sectional area of the connecting passage 15. The branched cooling water flows to the second water channel 14a through the connecting passage 15a, returns to the first water channel 9 through the connecting passage 15b, and joins the first water channel 9. Since the cross-sectional area of the first water channel 9 to be merged is increased by the amount corresponding to the cross-sectional area of the connecting passage 15, the cooling water can be merged without stagnation. Similarly, the second water channel 14b is connected to the first water channel 9 by the connecting passage 15c and the connecting passage 15d, and the cross-sectional area of the first water channel 9 is deformed in the same manner as described above according to the cross-sectional area of the connecting passage 15. The cooling water can be properly distributed and merged at the branch. Further, the second water channel 14c is connected to the first water channel 9 by the connecting passage 15e and the connecting passage 15f, and the cross-sectional area of the first water channel 9 has a structure that is deformed as described above according to the cross-sectional area of the connecting passage 15. The cooling water can be properly distributed and merged at the branch. In this way, the cooling water is configured to flow without stagnation from the first water channel 9 → the second water channel 14a → 14b → 14c → the first water channel 9. As a result, the sealing surface 5 can be efficiently cooled.

In the sealing device 1 of the present embodiment, the amount of cooling water supplied to the first water channel 9 can be about 15 to 30 liters / minute. The temperature of the cooling water can be about 15 ° C to 30 ° C.

As described above, as the temperature of the lubricating oil rises with the temperature rise of the sealing surface 5, the thickness of the oil film of the lubricating oil decreases, and the friction reducing effect of the lubricating oil decreases. As a result, the rotating ring 3 or the fixing ring 4 on the sealing surface 5 is significantly worn. The conventional sealing device has the same structure as the sealing device 101 shown in the comparative example, and a large amount of lubricating oil is supplied to the sealing surface in order to prevent the rotating ring 3 or the fixing ring 4 from being worn. Was. In the sealing device 1 of the present embodiment, the fixing ring 4 is provided with a cooling structure as shown in FIG. 2 so that the temperature rise of the lubricating oil on the sealing surface or the temperature of the lubricating oil can be controlled. As a result, wear of the rotating ring 3 or the fixing ring 4 on the sealing surface 5 can be effectively reduced without supplying a large amount of lubricating oil to the sealing surface. Next, the relationship between the temperature of the lubricating oil to be lubricated to the sealing surface 5 and the amount of the lubricating oil will be described in detail.

FIG. 6 shows the flow of the lubricating oil supplied from the high pressure lubricator 7 to the sealing surface 5. In the sealing device 1, the sealing surface 5 is strongly crimped by the pressing pin 12 attached to the yoke 11. A high-pressure lubricating oil pressurized by the high-pressure lubricator 7 is lubricated to the seal surface 5, to form an oil film 18. The oil film 18 is formed by a so-called static pressure lubrication method. The thickness of the oil film 18 can be expressed by the following Poiseuille relational expression (formula (1)). Here, Q is the amount of lubrication, R is a constant based on the shape of the sealing surface, P is the pressing pressure, h is the oil film thickness, and η is the viscosity of the lubricating oil. As shown by the formula (1), a flat Poiseuille flow is applied to the flow of the lubricating oil on the sealing surface 5, and the oil film thickness h is related to the lubrication amount Q, the viscosity η of the lubricating oil, and the pressure P for pressing the sealing surface 5. You can see that it does.

The pressure P for pressing the sealing surface 5 is set to a constant pressing pressure by a hydraulic cylinder connected to the upper part of the yoke 11 (not shown) so that the material to be kneaded such as rubber during kneading does not leak out from the kneading chamber 13. ing. The lubrication amount Q is associated with the viscosity η and the oil film thickness h. Since the oil film thickness h is set to a thickness that minimizes wear of the sealing surface 5, the lubrication amount Q for obtaining a predetermined oil film thickness h is determined by the viscosity η of the lubricating oil. FIG. 7 shows a graph showing the relationship between the temperature and the viscosity of the lubricating oil. Further, FIG. 8 shows a graph showing the relationship between the temperature of the lubricating oil and the oil film thickness.

In FIG. 7, it can be seen that the viscosity of the lubricating oil changes depending on the temperature, and when the temperature exceeds 60 ° C., the viscosity gradually decreases, and when the temperature is lower than 60 ° C., the viscosity sharply increases. For example, when the temperature of the lubricating oil becomes 75 ° C. or higher, the lubrication amount Q of the lubricating oil needs to be 150 liters or more in order to obtain a predetermined thickness of the oil film 18 (for example, 3.6 μm). However, the lubrication amount of the lubricating oil is calculated as the lubrication amount of the lubricating oil required when kneading 100 tons of rubber when the material to be kneaded is rubber.
On the other hand, when the temperature of the sealing surface 5 is set to, for example, less than 60 ° C., the viscosity of the lubricating oil on the sealing surface 5 becomes high, and the graph showing the relationship between the temperature of the lubricating oil and the oil film thickness shown in FIG. As shown, the oil film thickness 18 becomes thicker. Therefore, by setting the temperature of the sealing surface 5 to, for example, less than 60 ° C., the amount of lubrication required to reduce the wear of the sealing surface 5 can be reduced to 60 liters.

FIG. 9 shows a graph showing the relationship between the temperature of the lubricating oil and the amount of lubrication. As shown in FIG. 9, it has become possible to significantly reduce the amount of lubricating oil to be lubricated in order to obtain a predetermined oil film thickness 18. In the sealing device 1 of the present embodiment, the temperature of the sealing surface 5 can be reduced from 75 ° C. to 55 ° C. or lower by controlling the amount of cooling water to about 15 liters / minute. By increasing the viscosity, the effect of damping the oil film thickness is added, which makes it possible to reduce the amount of lubricating oil required to obtain a predetermined oil film thickness 18 (for example, 3.6 μm) to about 50 liters or less. Become.

Next, the processing method of the fixing ring 4 of the sealing device 1 will be described in detail with reference to FIG. 4 (a) to 4 (f) show diagrams for explaining each step included in the processing method of the fixing ring 4. The processing steps of the fixing ring 4 are (1) processing process of the first water channel 9, (2) processing process of the second water channel 14, (3) processing process of the connecting passage 15, and (4) processing process of the first water channel 9, second. A cover forming step of the water channel 14 and (5) a plug forming step to the connecting passage 15 can be included. Each processing process of these fixing rings 4 will be described below.

(1) Processing process of the first water channel 9 First, as shown in FIG. 4A, a fixing ring 4 divided into upper and lower parts 4 is prepared. The fixing ring 4 can have a flange portion 21 and a tubular portion 22 having a substantially cylindrical shape connected to the flange portion 21. A groove for forming the first water channel 9 is formed on the outer periphery of each flange portion 21 of the vertically divided fixing ring 4. The width of the groove for the first water channel 9 can be about 20 mm, and the depth of the groove for the first water channel 9 can be about 17 mm. Further, the depth of the deformed groove of the first water channel 9 can be set to about 14.5 mm.

(2) Processing step of the second water channel 14 Next, as shown in FIG. 4 (b), the fixing ring 4 is provided so that one side surface of the water channel 14 is located at a position about 10 mm away from the sealing surface 5. A groove for the second water channel 14 is machined in the cylinder portion. The width of the groove for the second water channel 14 can be about 20 mm. In this embodiment, the groove for the second water channel 14 is located at a position about 10 mm away from the sealing surface 5 and in the vicinity of the sealing surface 5, in consideration of the influence of distortion on the sealing surface due to processing. It is formed in. However, it goes without saying that the groove for the second water channel 14 is preferably formed as close as possible to the sealing surface 5 in order to cool the sealing surface.
Further, the depth of the groove for the first water channel 9 can be about 12.5 mm. Since it is necessary to provide the lubrication holes 8a, 8b, and 8c in the cylinder portion 22, in the present embodiment, the groove for the second water channel 14 is divided into three places while avoiding the position where the lubrication hole is formed. Is being processed.

(3) Processing step of connecting passage 15 Next, as shown in FIG. 4 (c), in order to install a cooling water passage from the first water channel 9 to the second water channel 14, the fixing ring 4 is divided into two parts. The upper ring is formed by processing, for example, using a drill so that the hole of the connecting passage 15 from the groove bottom of the first water channel 9 does not penetrate the inner surface of the flange portion in the radial direction from the outer surface of the flange portion 21. do. Two holes are formed in the connecting passage 15, for example, one for an inlet and one for an outlet for cooling water. Next, as shown in FIG. 4D, another connecting passage that extends from the end face of the flange portion 21 through the passage 15 formed by the above processing, extends in the extending direction of the tubular portion, and leads to the water channel 14. 15 is processed and formed using, for example, a drill. Two holes for the cooling water inlet and outlet are also formed in the other connecting passage 15. When a plurality of connecting passages 15 are formed, they can be formed by the same processing method.
The fixing ring 4 may be provided with a connecting passage 15 and lubrication holes 8a and 8b, but in order to adjust (cool) the temperature of the lubricating oil supplied to the sealing surface 5, the passage 15 is provided with the lubrication hole 8a. , 8b is preferably formed in the vicinity of. Similarly, in the lower fixing ring, a groove for the first water channel 9, a groove for the second water channel 14, and a hole for the connecting passage 15 are machined. The diameter of the hole in the connecting passage 15 is about 8 mm. Also in the lower fixing ring, the connecting passage 15 is preferably formed in the vicinity of the lubrication hole portion 8c. Further, the lower fixing ring is provided with a thermometer hole 16 for inserting a thermometer for measuring the temperature of the sealing surface 5.

(4) Cover forming step of the first water channel 9 and the second water channel 14 Next, as shown in FIG. 4 (e), a cover 23 is used to cover the grooves for the first water channel 9 and the second water channel 14, respectively. , 24 are attached, for example, by metal welding. In the present embodiment, the cover 24 for the second water channel 14 is embedded and welded in the groove for the second water channel 14 so that the depth of the second water channel 14 is, for example, about 8 mm.

(5) Step of forming the plug 25 to the connecting passage 15 Finally, as shown in FIG. 4 (f), the plug 25 is attached to the flange side 21 of all the connecting passages 15 extending in the extending direction of the tubular portion, and the plug 25 is attached from the passage. Prevent the cooling water from leaking out.
By the processing step described above, as shown in FIG. 4 (g), the cooling water that has entered the first water channel 9 enters the second water channel 14 through the connecting passage 15 and first passes through another connecting passage 15. A fixing ring 4 having a structure returning to the water channel 9 can be formed. By flowing the cooling water through all the first water channels 9 and the second water channels 14 (14a, 14b, 14c), it becomes possible to continuously cool both the fixing ring 4 and the sealing surface 5.

Although the principles of the invention have been illustrated and demonstrated in preferred embodiments, it will be appreciated by those skilled in the art that the invention may be modified in arrangement and detail without departing from such principles. The present invention is not limited to the specific configuration disclosed in this embodiment. Therefore, we claim all amendments and changes that come from the scope of the claims and their spirit.

1, 101 Sealing device 2 Rotor 3 Rotating ring 4 Fixing ring 5 Sealing surface 6 Kneading chamber side surface 7 High-pressure lubricator 8 Lubrication hole 9 First water channel 10 Cooling water circulation mechanism 11 York 12 Pushing pin 13 Kneading room 14 Second water channel 15 Connection Passage 16 Thermometer hole 17 Sealed kneader 18 Oil film 19 Housing 20 Rotor wing 21 Fixed ring Flange 22 Fixed ring cylinder 23 First channel cover 24 Second channel cover 25 Plug 26 End plate 27 Rotor shaft 28 Lubrication piping

Claims (4)

A sealing device for a sealed kneader equipped with a rotor having wings on the rotor shaft and an annular end plate into which the rotor shaft is inserted into an inner hole.
A rotating ring attached to the end face of the wing of the rotor,
An annular fixing ring, which is fitted in the axial direction of the rotor shaft and pressed against the end face of the rotating ring, is provided between the inner peripheral surface of the end plate and the outer peripheral surface of the rotor shaft.
The fixing ring has a flange portion and a tubular portion having one end connected to the flange portion and extending in the axial direction.
A sealing surface is formed between the rotating ring and the cylinder portion of the fixing ring.
The fixing ring is provided in the first water channel provided in the flange portion, the second water channel provided in the vicinity of the other end of the cylinder portion on the sealing surface side, and the first water channel provided in the cylinder portion. A sealing device for a sealed kneader, characterized in that it has a connecting passage connecting the second water channel and an lubrication hole provided in the cylinder portion for lubricating lubricating oil.
The second channel of the fixation ring comprises one or more bifurcated channels extending circumferentially.
The sealing device for a sealed kneader according to claim 1, wherein the branch water channels are arranged substantially coaxially in parallel in the circumferential direction .
The sealing device for a sealed kneader according to claim 1 or 2, wherein a part of the connecting passage is arranged in the vicinity of the lubrication hole portion extending in the axial direction.
The second water channel is characterized in that the temperature of the lubricating oil lubricated on the sealing surface is adjusted so that an oil film of the lubricating oil having a predetermined thickness is formed on the sealing surface. The sealing device for a sealed kneader according to any one of claims 1 to 3.

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