JPH07791A - Bearing and seal device for mixer shaft - Google Patents

Abstract

(57) [Summary] [Object] The present invention provides a bearing and a seal device for a shaft (34) in a mixer having a fixed container part (22) and a rotary mixing part (64, 66), which is easy to repair and maintain. The purpose is to provide. [Constitution] A seal chamber (24) is detachably attached to a container part (20) on a shaft and has a separate bearing part (88). The sealing chamber (24) can be separated so that it can easily contact the sealing material, thus reducing repair costs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixer having a fixed container part and a rotary mixing part, wherein a seal chamber for a shaft is detachably attached to the container part and has a separate bearing part. Bearings and sealing devices for shafts of mixers in.

[0002]

2. Description of the Prior Art Mixers have to meet various problems in order to integrate one substance with one or several other materials. There are various types of rotary mixing parts or stirring parts for mixers, but in order to prevent the mixed substances from passing through the mixing container part, the rotating part, that is, the shaft of the mixing part is well sealed. ) Must have been done. If the mixed material is abrasive, the sealing material tends to wear. Therefore, maintenance of the sealing material is important.

An example of a conventional bearing and seal arrangement for the shaft in a mixer is shown in FIG. A collar (collar) 4 is welded to the wall 2 of the mixer. The collar 4 surrounds the shaft 6 and the sealing material 8. End 6'of shaft 6
Are received in bearings 12, which in this example are ball bearings, which are likewise housed in the collar 4. The collar 4 is externally closed by a flange 16 fixed by screws 14. Although repair of the sealing material is sometimes necessary, it is inevitable that the cost is high in the device having such a structure.
That is, some of the parts must be disassembled, in which case the part that constitutes the sealing part, such as the flange 16 and the collar 4
You must slide outward along the road. At this time, sufficient space must be provided. This considerable maintenance cost also affects the operating cost of the mixer.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a shaft bearing and seal device for a mixer having a fixed container part and a rotary mixing part, which is easy to maintain.

[0005]

The shaft bearing and seal device in a mixer having a fixed container part and a rotary mixing part according to the present invention has a seal chamber attached to the container part for the shaft and a separate bearing part. The seal chamber is removable and separable. According to the present invention, the seal chamber and the bearing portion are configured to be separated from each other, and the seal chamber can be detached from the container portion, so that it is easy to contact the seal portion. As a result of configuring the sealing chamber in this way, the sealing material can be easily taken out. In order to touch the seal part, simply remove a part of the seal chamber. Obviously, the parts of the sealing chamber can be separated if desired.

Another advantage of the structure of the present invention is that the seals can be easily contacted so that they can be replaced or modified as needed. Therefore, it is relatively easy for those skilled in the art to make the sealing material compatible with the mixed substance. This is important because the sealing material is extremely burdened with a mixed substance having repulsive grindability.

A threaded connection is particularly advantageous for the sealing chamber. As a separable structure of the seal chamber, the seal material housed in the seal chamber is, for example, a packing retainer, so that it is not necessary to change it using a special tool.

It is preferable to insert a fixture between the seal chamber and the shaft, thereby closing the space between the seal chamber and the shaft, and incorporating the seal material in this space. The fixture is one or two tightening rings, which can close the sealing chamber effectively and easily, while being opened with a simple operation.

The seal chamber and the seal material preferably form a packing box, and the seal material or packing serves as a packing retainer. A preferred seal material is a lip seal material. Of course, other sealing materials can be used.

If a highly abrasive mixture is introduced, a casing may be used according to the invention to protect the shaft.

In order to ensure that the mixed substance is completely discharged from the container part, according to the invention, a closing fluid, in particular a compressed air passage, is provided between the two packings (sealing material) and said packing. To By doing so, the clogging state is prevented.

[0012]

The present invention will now be described in more detail with reference to the drawings showing preferred embodiments thereof.

The construction of the shaft bearing and sealing device of the mixer according to the invention is first shown in FIGS.
In this example, on the wall 22 of the container part 20 made of high quality steel, bolts
The seal chamber 24 is fixed by 26. The sealing chamber 24 consists of two parts 28, 30 and surrounds an opening 32 in the wall 22 of the container part 20, through which a shaft 34 forming a mixing part extends. A casing 40 extends on the shaft 34 along the region of the sealing chamber and slightly outwardly therefrom, which is fixed to the shaft 34 by fixing screws 42. Casing 40 and wall 22
A small gap 44 is provided at the periphery of the opening. It should be noted that in this case some strain hardening tolerance must be accounted for due to the vessel material and the welding problems associated therewith. Opening of container
32, therefore, must have enough play. Wall 2
2. The space between the seal chamber 24 and the casing 40 is closed at the outside by a tightening ring 48 fixed by a flange 46. The tightening ring 48 is fixed to the seal chamber 24 with bolts 50. There is a slight gap 52 between the tightening ring 48 and the casing 40. On the other hand, two seal members 54 and 56 are provided in the empty portion closed from the outside by the tightening ring 48, and a passage 53 for a sealing fluid, for example, compressed air, is provided between them. Compressed air is approximately 10 5 Pascal (Pa)
It is possible to prevent the mixture from clogging the sealing material by flowing into the container portion under the pressure of.

2 and 3 show the construction of the shaft seal according to the present invention described above. Since the gaps 44 and 52 are provided outside the seal materials 54 and 56, and the seal chamber 24 is slidable with respect to the container wall 33, the shaft 34 that does not precisely match the opening 32 of the container wall. While bearings of the above are possible, the bearing itself is located outside the container 20.
Since the seal chamber 24 is slidable, the seal packing can be centered on the shaft. Seal room 24
With the above configuration, it is easy to contact the sealing material. To this end, the screws in the relevant parts of the sealing chamber 24
It is only necessary to remove the associated screws 50 of 26 and the tightening ring 48, so that the sealing chamber 24 can be completely or partially removed. The seals 54 and 56 can thus be removed and thus directly repaired. When the casing 40 also needs to be repaired, it is only necessary to remove the sealing materials 54, 54.

FIG. 4 shows the overall structure of a mixer equipped with the device of the present invention. In this plan sectional view, the container part 20 has an upper opening 60 from which the materials to be mixed are fed. The outlet 62 is shown contoured and the mixing parts 64, 66 mounted on the shaft 34. Two shafts 34 are provided as a whole to form a mixing portion, and the shaft 34 has a seal portion shown in FIGS. 2 and 3 and penetrates the container portion 20. Further, a shaft bearing portion may be provided outside the container portion as described below.

On the left side of the wall 22 of the container part 20 is provided a support structure 68 for a bearing housing 78, on which the bearings and drives of the shaft 34 are mounted, through which the motor 80 is mounted. Driven by. On the right side of the container part 20,
The shaft 34 is provided with bearings and seals of similar construction. The sealing chamber according to FIGS. 2 and 3 is thus screwed onto the wall 22, through which the shaft 34 with the end 56 extends. The ends are supported by bearings 88. The entire bearing portion is supported by the support structure 90.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a conventional bearing and sealing device for a shaft of a mixer.

FIG. 2 is an explanatory sectional view of the device of the present invention.

3 is a plan view of the device of FIG.

FIG. 4 is an explanatory diagram of the entire mixer.

[Explanation of symbols]

 20: Container 24: Seal chamber 34: Shaft 48: Fixture 54, 56: Seal material

Claims (9)

[Claims] 1. A mixer having a fixed container part and a rotary mixing part, wherein a seal chamber (24) for a shaft has a container part (2).
A mixer shaft bearing and a seal device, wherein the seal chamber (24) is removable and separable in a mixer which is detachably attached to (0) and has a separate bearing portion (88). 2. A device according to claim 1, wherein the sealing chamber (24) is screwed onto the container part (20) and is slidable with respect to the container part. 3. A fixture (48) is inserted between the seal chamber (24) and the shaft (34), and the fixture is the shaft (34) and the seal chamber (2).
The space between 4) is closed, and the sealing material (5
The device according to claim 1 or 2, wherein the device (4, 56) is housed. 4. The device of claim 3, wherein the fixture (24) is a tightening ring. 5. A sealing chamber (24) and a sealing material (54, 56)
The device according to claim 2 or 4, which constitutes packings. 6. The device according to claim 5, wherein the sealing material (54, 56) is a packing retainer. 7. The device according to claim 3, wherein the sealing material is a lip-shaped seal. 8. The casing (4) of the sealing material (54, 56)
0) The device according to any one of claims 3 to 7, which is provided. 9. Two packings (sealing materials) (54, 5)
9. A device as claimed in any one of claims 5 to 8 in which a closing fluid, in particular a compressed air passage, is provided between 6) and the packing.