JPH05161840A - Shaft seal device of rotor of kneader - Google Patents

Abstract

PURPOSE:To reduce the abrasion of seal part, to automate the adjustment of the gap of a seal surface and to enhance durability. CONSTITUTION:The shaft seal device of the rotor of a kneader is constituted so that a kneading rotor 2 is provided in a housing 1 having an upward material supply port 17 in a freely rotatable manner and the drive shaft part 2B of a rotor 2 is in contact with a shaft seal housing 4 through a sleeve 3 and a plurality of shaft vibration following rings 5-8 and a fixed ring 14 is fitted to the housing 4 on the side of the material supply port 17 so as to form a ventilation gap between the sleeve 3 and the housing so as to prevent a particulate material from flowing in the drive shaft part 2B. Each of the shaft vibration following rings 5-8 consists of each of divided bodies 29 divided in the peripheral direction and the spring 31 energizing each of the divided bodies 29 from the outer periphery to the axis and gas passing gaps are formed between the opposed surfaces of the respective divided bodies 29 in the peripheral direction and the air supplied from an air supply passage 18 into an annular space 9 passes through the ventilation gap 13 to flow out toward the material supply port 17 of the housing 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft seal device for a kneader rotor for kneading materials in which powder and granules are mixed.

[0002]

2. Description of the Related Art In general, a powder seal (shaft seal) is different from a liquid seal in that if a powder (particularly a hard powder) gets into the seal surface, the seal material is greatly damaged. is necessary. Conventionally, as a rotor shaft sealing device of a kneading machine for kneading a powder or granular material, for example, a synthetic resin kneading material (hereinafter simply referred to as a material), there is one shown in FIG. 3 (for example, see Japanese Utility Model Publication No. 60-115). This shaft seal device includes a sleeve 44 externally fitted to a drive shaft portion 42A of a kneading rotor 42, which is rotatably fitted in a housing 41 having a material supply port 40 in an upward opening shape, and a shaft seal housing 43 ( It is composed of an oil seal 45 attached to the drive end frame) and a synthetic resin ring 46.

A space 47 is formed in the shaft-sealing housing 43 between the oil seal 45 and the synthetic resin ring 46, and a gas supply passage 48 communicating with the space 47 is provided and supplied to the space 47. Gas (air or N ₂ gas) flows from the gap 49 between the ring 46 and the sleeve 44 toward the material supply port 40 as shown by the arrow in FIG. 3, and the gap C between the kneading rotor 42 and the front end of the shaft seal housing 43. Therefore, the material, especially the powder, is prevented from flowing in.

The oil seal 45 is used without lubrication, and its lip 45A is pressed against the outer peripheral surface of the sleeve 44 by the ring-shaped spring 50, and the pressing force is applied to the spring 50.
It is adjusted by adjusting the force of.

[0005]

In the above-mentioned conventional example, the powder of the material can be prevented from flowing into the drive shaft portion 42A, but the oil seal 45 is used in a way different from the original usage. Therefore, the lip 45A or the lip contact portion of the sleeve 44 is quickly worn, and the spring force of the spring 50 of the oil seal 45 must be properly adjusted, and the oil seal 45 and the sleeve 44 are severely damaged. There are problems such as frequent replacement.

The present invention has been made in view of the above situation, and an object of the present invention is to reduce wear of a seal portion and to frequently adjust a spring pressure of an oil seal or the like and an oil seal or the like. SUMMARY OF THE INVENTION It is an object of the present invention to provide a kneading rotor shaft sealing device which does not need to have a large durability.

[0007]

In order to achieve the above object, the present invention takes the following technical means. That is, according to the present invention, a kneading rotor is rotatably fitted in a housing having a powdery and granular material supply port in an upward opening shape, and a drive shaft portion of the rotor is axially supported by a shaft-sealed housing and driven. In a kneading machine in which the material does not flow into a shaft portion, a sleeve is fixed to the outer periphery of the drive shaft portion, and an annular space is formed between the sleeve and the inner periphery of the shaft sealing housing. At the same time, a fixed ring having a ventilation gap is fitted between the material supply port side and the sleeve, and an axial run-away ring composed of a plurality of divided bodies is slidably contacted with the plurality of rows of sleeves in the space. It is characterized in that a gas communication gap is formed between the divided bodies in the direction, and a gas supply path is communicated with the space on the outer peripheral side of the shaft wobbling follow-up ring.

Further, according to the present invention, the shaft seal housing is provided with an auxiliary gas supply passage communicating with the outer circumference of the sleeve between the fixed ring and the shaft run-away ring, and the auxiliary gas supply passage and the gas supply passage are connected to each other. Is characterized in that each is connected to a gas supply pipe via an individual regulator.

[0009]

According to the present invention, the gas supplied from the gas supply passage into the annular space of the shaft-sealed housing is supplied to the sleeve and the follow-up ring from the gap formed between the circumferentially divided bodies of the shaft wobbling follow-up rings. The gas that flows back and forth in the axial direction through the inner circumferential surface of the shaft sealing housing located in the front and rear in the axial direction and flows forward in the axial direction in the kneading rotor and the shaft sealing housing through the gap between the fixed ring and the sleeve. It flows into the housing through the gap with the peripheral surface.

Therefore, the material introduced into the housing through the material supply port does not flow into the gap between the kneading rotor and the inner peripheral surface of the shaft-sealed housing, and the sealed portion is protected. Even if the inner surface of the split run-out ring in contact with the outer peripheral surface of the sleeve wears, the split body is biased by the spring in the axial center and follows and contacts, so the clearance is automatically adjusted. The sealing function is maintained.

Further, gas having a pressure adjusted from the auxiliary gas supply path is replenished to the outer circumferences of the sleeves of the fixed ring and the shaft run-out follow-up ring, and the gas flowing out from the gap between the kneading rotor and the inner peripheral surface of the shaft seal housing is The pressure is properly controlled to ensure the optimum sealing function.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1 and FIG. 2, 1 is a housing of the kneading machine,
2 is a kneading rotor and its screw portion 2A is the housing
1 is rotatably fitted inside, and the sleeve 3 is externally fitted and fixed to the drive shaft portion 2B at the rear end.The shaft seal housing is fixed to the rear end of the housing 1 or the front end of the drive end frame (not shown). 4 is equipped with four sets of shaft run-out follow-up rings 5,6,7,8.

The shaft-sealing housing 4 has an annular space 9 in which shaft run-away follow-up rings 5-8 are fitted in the rear half of the inner circumference of the shaft-sealing housing 4.
And the ventilation gaps 10 and 11 are formed in the front and rear thereof, and the fixing ring fitting groove 12 is formed at the intermediate position of the front half, and the ventilation gap is formed between the groove 12 and the outer peripheral surface of the sleeve 3. A fixing ring 14 is fitted so as to form an annular gap 13 for use, and an auxiliary gas supply space 15 is provided between the fixing ring 14 and the ventilation gap 10.

The ventilation gap 10, the auxiliary gas supply space 15, and the ventilation annular gap 13 are formed between the blade rear end outer circumference 2C of the kneading rotor 2 and the front end inner peripheral surface of the shaft-sealing housing 4. It communicates with the outflow gap 16, which is close to the upwardly opening material supply port 17 of the housing 1. Further, the shaft-sealing housing 4 is provided with a gas supply passage 18 and an auxiliary gas supply passage 19 which communicate with the spaces 9 and 15, respectively, and the gas supply passages 18 and 19 respectively have individual pressure regulators. 2
The gas supply pipes 22 and 23 are connected via 0,21, the pressures of the gases supplied to the spaces 9 and 15 are individually controlled, and the gas flowing out from the gas outflow gap 16 allows the material It is possible to effectively prevent the powder from flowing into the outer periphery of the drive shaft portion 2B from the gap 16.

Reference numerals 24 and 25 are on-off valves, 26 and 27 are pressure gauges, and the gas supply pipes 22 and 23 are connected to a main supply pipe 28. As shown in FIG. 2, the shaft deflection follow-up rings 5 to 8 each include a divided body 29 which is divided into three in the circumferential direction, and a predetermined gas conduction gap is provided between the circumferential end faces of the divided bodies 29. A coil spring 31 wound around the outer periphery of the divided body 29 presses the inner peripheral surface of each divided body 29 against the outer periphery of the sleeve 3 with a predetermined pressure so that the two are always in surface contact with each other, that is, in a sealed state. It has become so. The divided body
The number of divisions of 29 is not limited to three, but may be two or other.

The follow-up rings 5, 6, 8 are locked to the shaft-sealing housing 4 by locking pins 32, 33 so as not to rotate, and are movable in the radial direction. In each of the divided bodies 29, coil-shaped biasing springs 35 are fitted in holes 34 bored in the axial direction from the follower ring 6 side, respectively, and the other rings 5 except the adjacent faces of the follower rings 6 and 7 are attached. ,
6 and 7, 8 and the axial end surface of the space 9 maintain a sealed state at an appropriate pressure.

In the above embodiment, the shaft run-out follow-up ring 5
8 to 8 and the fixing ring 14 are preferably made of synthetic resin such as Teflon mixed with a reinforcing agent such as glass fiber. The pressure of the gas introduced into the auxiliary gas supply passage 19 is lower than the pressure of the gas introduced into the gas supply passage 18, so that the flow of the gas flowing out from the ventilation gap 10 to the space 15 is not disturbed. In addition, the gas flow flowing out from the ventilation gap 10 is optimized only. To that end, a separate regulator 20,21 is provided for each tube 22,23.

According to the invention, the gas supply passage 18 to the space 9
The gas (air or N ₂ gas) supplied inside is the gap 30 of the split body 29 of each shaft run-away ring 5 to 8 and the rings 6 and 7.
The front air gap 10 and the rear air gap 11
The gas that flows out from the front and back in the axial direction, and the gas that flows out forward,
An annular gap 13 between the sleeve 3 and the fixed ring 14 via the auxiliary gas supply space 15 and a gap between the outer periphery 2C of the rear end of the blade of the kneading rotor 2
It passes through 16 and flows out into the housing 1 at a predetermined pressure.

Therefore, from the material supply port 17 to the housing
Especially the powder of the material supplied in 1 cannot penetrate into the drive shaft 2B through the gap 16 between the rear end outer periphery 2C of the kneading rotor 2 and the shaft sealing housing 4, and the sealing function is sufficiently exerted. .. Even if the inner peripheral surfaces of the shaft run-away rings 5 to 8 and the outer peripheral surface of the sleeve 3 are worn, the inner peripheral surfaces of the shaft run-away rings 5 to 8 are pressed into contact with the outer peripheral surface of the sleeve 3 by the coil spring 31. The sealed state is automatically secured. Further, the gas from the supply passage 18 is the following ring 5 ~
Performs 8 cooling functions. The gap 30 not only serves for gas conduction, but also functions to allow the ring to wear and stick to the shaft by a spring on the outer periphery to follow the shaft run-out until a certain amount of wear occurs.

The present invention is not limited to the above embodiment, but can be modified in design as appropriate.

[0021]

As described above, according to the present invention, the kneading rotor is rotatably fitted in the housing having the powdery and granular material supply port in the upward opening shape, and the drive shaft portion of the rotor is the shaft-sealed housing. In a kneading machine that is axially supported on the drive shaft portion so that the material does not flow into the drive shaft portion, a sleeve is fixed to the outer periphery of the drive shaft portion, and a sleeve is attached to the inner periphery of the shaft seal housing. An annular space is formed therebetween, and a fixing ring having a ventilation gap is fitted between the material supply port side and the sleeve, and a plurality of rows of shaft run-out follow-up rings composed of a plurality of divided bodies are provided in the space. It is arranged so as to be in sliding contact with the sleeve and to form a gas conduction gap between the divided bodies in the circumferential direction, and a gas supply path is communicated with the outer peripheral side space of the shaft run-away ring. Because it is something that Portion becomes surface contact, a clearance of wear is small and the seal surface is adjusted automatically and properly,
It is possible to improve durability and simplify maintenance and management without requiring manual adjustment work.

Further, according to the present invention, the shaft seal housing is provided with an auxiliary gas supply passage communicating with the outer circumference of the sleeve between the fixed ring and the shaft run-away ring, and the auxiliary gas supply passage and the gas supply passage are connected to each other. Is characterized in that the gas supply pipes are connected to each through individual regulators, so that the pressure of the sealing gas can be properly adjusted to achieve a perfect seal.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a side view of a shaft wobbling tracking ring.

FIG. 3 is a vertical sectional view of a conventional example.

[Explanation of symbols]

 1 Housing 2 Kneading rotor 2B Drive shaft part 3 Sleeve 4 Shaft sealed housing 5 Shaft shake follow ring 6 Shake shake follow ring 7 Shake shake follow ring 8 Shake shake follow ring 9 Space 13 Ventilation gap 14 Fixed ring 15 Space 17 Material supply port 18 Gas supply path 19 Auxiliary gas supply path 20 Adjuster 21 Adjuster 22 Gas supply pipe 23 Gas supply pipe 29 Divided body 30 Gas conduction gap

Claims (2)

[Claims] 1. A kneading rotor is rotatably fitted in a housing having a powdery and granular material supply port in an upward opening shape,
In a kneading machine in which a drive shaft portion of the rotor is axially supported by a shaft-sealed housing and the material is prevented from flowing into the drive shaft portion, a sleeve is fixed to an outer periphery of the drive shaft portion, An annular space is formed between the sleeve and the inner periphery of the shaft-sealing housing, and a fixing ring having a ventilation gap is fitted between the sleeve and the material supply port side. The axial deflection follow-up ring composed of the divided bodies is arranged so as to be in sliding contact with the plural-row sleeves and a gas conduction gap is formed between the divided bodies in the circumferential direction. A shaft sealing device for a kneading machine rotor, characterized in that supply paths are communicated with each other. 2. The shaft seal housing is provided with an auxiliary gas supply path communicating with the outer circumference of the sleeve between the fixed ring and the shaft run-away ring, and the auxiliary gas supply path and the gas supply path are individually provided. 2. The shaft sealing device for a kneader rotor according to claim 1, wherein a gas supply pipe is connected via a regulator.