JPS6234602Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of a top-drive centrifuge used to separate solids and liquids or liquids with different specific gravities using centrifugal force.

(Prior Art) Conventionally, as this type of top drive type centrifugal separator 50, one shown in FIG. 3, for example, is known.

This includes a bed 51, an elastic support device 52 provided on the bed 51, a casing 54 supported by the bed and equipped with a discharge port 53 at the bottom, a bearing device 55 provided on the top of the casing 54, A vertical main shaft 56 that is rotatably supported, and a basket 58 that is provided within the casing 54 and has a lower part of the main shaft 56 fixed and an outlet 57 at the lower part.
and a main shaft 56 provided on the upper part of the casing 54.
The main part thereof consists of a rotary drive device 59 for rotating the rotary drive device 59.

In such a centrifugal separator 50, the main shaft 56 and the basket 58 are rotated by activating the rotary drive device 59.

The processed material is supplied into the basket 58 from a supply pipe 60 provided at the upper part of the casing 54, and is centrifuged by rotation of the basket 58.

The separated liquid after centrifugation is discharged from a drain pipe 61 provided at the bottom of the casing 54, and
The cake adheres to the inner peripheral surface of the basket 58. The adhering cake is scraped off by a scraping device 62 provided on the casing 54 and discharged from the outlet 57 through the discharge port 53 of the casing 54 through a discharge port damper (not shown) provided here. be done.

Further, the centrifugal separator 50 has explosion-proof measures in consideration of flammable materials to be processed.

In other words, by injecting an inert gas higher than atmospheric pressure into the casing and exhausting the air inside, the material to be processed is centrifuged in an inert gas atmosphere, and there is no space between the main parts. By installing a ground wire, static electricity that can cause ignition can be grounded.

However, although the conventional devices take explosion-proof measures as described above, they are not particularly reliable in terms of grounding against static electricity.

This is because the basket 58 and the main shaft 56 are fixed and therefore conductive, but the main shaft 5
A bearing device 55 is interposed between the rotary drive device 59 and the casing 54, and a bearing device (not shown) is provided between the rotary shaft and the housing of the rotary drive device 59.
Strictly speaking, they were in contact through an oil film, so they were not completely electrically conductive.

Therefore, the static electricity generated in the so-called rotating bodies such as the basket 58 and the main shaft 56 is not completely grounded, and there is a possibility that the processed material may explode.

(Problems that the invention attempts to solve) This invention was created in view of the problems mentioned above and to solve them, and its purpose is to:
To provide a top drive type centrifugal separator which prevents explosion of processed materials by surely grounding static electricity generated in a rotating body.

(Means for solving the problem) The top drive centrifuge of the present invention has a bed,
An elastic support device provided on this, a casing supported by this and equipped with a discharge port at the bottom, a bearing device provided on the top of this, and a vertical main shaft rotatably supported by this. , a basket provided in the casing to which the lower part of the main shaft is fixed and having an outlet at the lower part; a rotary drive device provided in the upper part of the casing for rotating the main shaft; and a rotation drive device provided in the lower part of the main shaft. an earth tank with an open top placed at the bottom of the casing to surround it, a closed balance tank placed outside the casing, and a ground tank that penetrates the casing to connect the earth tank and balance tank. It consists of a communication pipe that communicates the lower parts with each other, a communication pipe that communicates the upper part of the balance tank with the inside of the casing, and water that is injected into the earth tank, balance tank, and communication pipe so that the earth rod is immersed. There are characteristics.

In other words, a conventional top-drive centrifuge has an earth rod, an earth tank, a balance tank, a communication pipe,
It is equipped with a connecting pipe and a rotating grounding device made of water.

(Function) The grounding rod rotates together with the basket and the main shaft, but regardless of this, it is always immersed in the water in the grounding tank.

Basket, main shaft, earth rod, earth tank,
The communication pipe, casing, bed, etc. are all made of conductive materials such as iron, and water is also conductive, so static electricity generated in rotating bodies such as the basket and main shaft is transferred from the rotating body to the ground rod to the water. → Earth tank → Communication pipe → Casing → Earth wire interposed between casing and bed → Grounded via bed.

Additionally, if the casing is filled with an inert gas higher than atmospheric pressure, the pressure will be equally applied to the water level in the earth tank and the water level in the balance tank via the communication path, so each water level will always remain constant. kept,
The earth rod and the water in the earth tank are always kept immersed.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a partially cutaway front view showing the structure of a top drive centrifuge according to an embodiment of the present invention. Second
The figure is a side view of only the balance tank.

The top drive centrifuge 1 includes a bed 2, an elastic support device 3, a casing 4, a bearing device 5, a main shaft 6,
Basket 7, rotation drive device 8, earth rod 9, earth tank 10, balance tank 11, communication pipe 1
2, a connecting pipe 13, and water 14 constitute its main parts.

The bed 2 is installed and fixed at the installation location.

There are three elastic support devices 3 provided on the bed 2, each consisting of a support 15, a suspension rod 16, a frame 17, and a suspension spring 18.

The casing 4 is supported by an elastic support device 3 and has a discharge port 19 at the bottom, and includes a disc-shaped lid plate 20, a cylindrical large-diameter body plate 21, and an annular bottom plate 2.
2. Consists of a cylindrical small-diameter body plate 23, and a large-diameter body plate 2.
The frame 17 of the elastic support device 3 is located at the lower part of the outer periphery of the frame 1.
is fixed thereto, and a discharge port 19 is formed in the lower part of the small-diameter body plate 23 that passes through the bottom plate 22.

The bearing device 5 is provided in the upper part of the casing 4, and consists of a cylindrical bearing shell 24 that passes through the cover plate 20 of the casing 4, and bearings (not shown) disposed above and below inside this. It is completed.

The main shaft 6 is a vertical shaft rotatably supported by a bearing device 5, and its upper half is supported by upper and lower bearings of the bearing device 5.

The basket 7 is provided inside the casing 4, the lower part of the main shaft 6 is fixed, and the lower part has an outlet 2.
5, an annular upper wall 26, a cylindrical trunk wall 27, an annular bottom wall 28, and a main shaft 6
It consists of a support wall 29 connecting the lower part of the bottom wall 28
An outlet 25 is provided in a portion surrounded by the main shaft 6 and the supporting wall 29.
is formed.

The rotation drive device 8 is provided in the upper part of the casing 4 and rotates the main shaft 6. A hydraulic motor is fixed to the upper part of the bearing shell 24 of the bearing device 5, and the rotation shaft (not shown) and the main shaft 6 are connected to each other. are connected by spline fittings (not shown).

The ground rod 9 is provided at the bottom of the main shaft 6, and its axis is aligned with the center of rotation.

The earth tank 10 is of an upwardly open type arranged at the lower part of the casing 4 to surround the earth rod 9, and is located inside the small-diameter body plate 23 of the casing 4.

The balance tank 11 is a closed type placed outside the casing 4, and is on the same level as the earth tank 10, with a water inlet 30 at the top, a water outlet 31 at the bottom, and a water outlet 31 at the side. A water level gauge 32 is provided, and the water inlet 30 and water outlet 31 are always closed by plugs.

The communication pipe 12 passes through the casing 4 to communicate the lower portions of the earth tank 10 and the balance tank 11, and passes through the small-diameter body plate 23 of the casing 4 and is fixed thereto.

The communication pipe 13 communicates between the upper part of the balance tank 11 and the inside of the casing 4, and one end thereof passes through the small-diameter body plate 23 of the casing 4 and is fixed thereto.

Water 14 is injected into the earth tank 10, balance tank 11, and communication pipe 12 so that the earth rod 9 can be immersed therein, and is injected from the water inlet 30 of the balance tank 11 until the water reaches a predetermined level. ing.

Incidentally, as in the conventional case, a supply pipe 3 for supplying the processed material into the basket 7 is provided at the upper part of the casing 4.
3, there is a drain pipe 34 at the bottom of the casing 4.
However, each of the discharge ports 19 is provided with a discharge damper (not shown), and a scraping device 35 for scraping off the cake in the basket 7 is provided on the upper part of the casing 4.

Further, each component except for the water 14 is made of a conductive material such as iron, and as in the conventional case, a ground wire (not shown) is interposed between the bed 2 and the casing 4.

Next, the operation will be explained based on such a configuration.

When the rotation drive device 8 is activated, the main shaft 6, the basket 7, and the ground rod 9 rotate.

Since the axis of the earth rod 9 is aligned with the center of rotation, the earth rod 9 is immersed in the conductive water 14 in the earth tank 10 without making waves.

When static electricity is generated in the so-called rotating bodies such as the basket 7 and the main shaft 6, it is transferred from the earth rod 9 to the water 14.
→ Earth tank 10 → Communication pipe 12 → Casing 4
→ Ground wire (not shown) → Grounded via bed 2.

In addition, inert gas higher than atmospheric pressure is injected into the casing 4 to exhaust the air inside the casing 4.
When the material to be processed is centrifuged with the tank filled with inert gas, the pressure is applied to the water surface in the earth tank 10.

For this reason, the balance tank 1 is connected via the communication pipe 12.
The water level in the earth tank 10 and the balance tank 11 is about to rise, but since the same pressure inert gas in the casing 4 is led to the upper part of the balance tank 11 through the communication pipe 13, the water level in the earth tank 10 and the balance tank 11 is Each water level is kept at the same level, and the earth rod 9 is always immersed in the water 14, regardless of the pressure inside the casing 4.

Therefore, the above-mentioned earthing function of the rotating body is continuously performed.

The level of the water 14 can be confirmed by monitoring the water level gauge 32, and the water 14 can be injected and discharged from the water inlet 30 and the water outlet 31.

(Effects of the invention) As described above, according to the present invention, the following excellent effects can be achieved.

(1) Earth rod, earth tank, balance tank,
Since a grounding device exclusively for the rotating body consisting of a communication pipe, a connecting pipe, and water is provided, it is possible to reliably ground the static electricity generated in the rotating body and prevent explosion of the processed material.

(2) In addition to the ground rod, ground tank, and water, we also installed a balance tank, communication pipe, and connection pipe to ensure that the water level in the ground tank remains constant even if the pressure inside the casing changes. , static electricity can be grounded regardless of the pressure inside the casing.

(3) Since the balance tank is installed outside the casing, a water inlet, water outlet, and water level gauge can be installed here, making it easy to adjust the condition and amount of water in the earth tank from the outside. Can be done.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing the structure of a top drive centrifuge according to an embodiment of the present invention. Second
The figure is a side view of only the balance tank. Figure 3 shows
FIG. 1 is a partially cutaway front view showing the structure of a conventional top drive centrifuge. 1...Top drive centrifuge, 2...Bed,
3...Elastic support device, 4...Casing, 5...
Bearing device, 6...Main shaft, 7...Basket, 8...
... Rotation drive device, 9 ... Earth rod, 10 ... Earth tank, 11 ... Balance tank, 12 ... Communication pipe, 13 ... Communication pipe, 14 ... Water.

Claims (1)

[Scope of utility model registration request] A bed, an elastic support device provided thereon,
A casing supported by the casing and equipped with a discharge port at the bottom, a bearing device provided at the top of the casing, a vertical main shaft rotatably supported by the casing, and a lower part of the main shaft provided inside the casing. A basket to which is fixed and has an outlet at the bottom, a rotary drive device provided at the top of the casing to rotate the main shaft, a ground rod provided at the bottom of the main shaft, and a casing to surround it. An upwardly open earth tank placed at the bottom of the casing, a closed balance tank placed outside the casing, a communication pipe that passes through the casing and connects the bottom of the earth tank and the balance tank, and the balance tank. a communication pipe that communicates between the upper part of the tank and the inside of the casing;
A top drive centrifuge characterized by comprising an earth tank, a balance tank, and water injected into a communication pipe in which the earth rod is immersed.