JPH043632Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to a centrifuge.

BACKGROUND ART Conventionally, as shown in FIG. 3, a horizontal centrifuge has a cylindrical shape at one end and a conical shape at the other end, and has a drainage port 41 for separated liquid at one end.
However, a cylindrical body 43 having a solid material discharge port 42 formed at the other end, and a screw blade 45 disposed over the entire length inside this cylindrical body 43 and having a rotating shaft body 44 in the center, A liquid spout 46 is formed in the middle part of the rotating shaft 44, that is, between the sedimentation area a and the dehydration zone b, and a liquid spout 46 is inserted into the rotating shaft 44 from the other end. It is composed of an open liquid supply pipe 47 for the liquid to be separated, and a rotational drive device (not shown) that rotates the cylindrical body 43 and screw blades 45. Note that the cylindrical portion 43a of the cylindrical body 43 serves as a settling region a, and the conical portion 43b serves as a dehydration region b. In the above configuration, the liquid to be separated c injected from the liquid supply pipe 47 between the sedimentation zone a and the dehydration zone b is separated into solid matter d and separated liquid e by the rotating cylindrical body 43. The separated liquid e is drained from the drain port 41, while the solid matter d is transferred to the drain port 42 by the screw blade 45 and discharged to the outside.

Problems that the invention aims to solve According to the conventional centrifuge described above, the liquid to be separated is injected between the sedimentation zone and the dehydration zone, so disturbance occurs constantly in that area, causing sedimentation in the difficult sedimentation zone. There was a problem with floating solids. In addition, since the rotating shaft of the screw blade passes through the center of the cylindrical body, it is difficult for the separated liquid to flow, and the separated liquid inevitably flows between the screw blades in the opposite direction to the solid material. There was also the problem that solid matter was suspended in the liquid, resulting in poor separation efficiency.

Therefore, an object of the present invention is to provide a centrifugal separator that can solve the above problems.

Means for Solving the Problems In order to solve the above problems, the centrifugal separator of the present invention supports a cylindrical body with openings formed at both ends so as to be rotatable around a horizontal axis. A cylindrical body is rotatably inserted into the cylindrical body from an opening at one end of the body, and a hollow shaft body is rotatably inserted from an opening at the other end of the body, one end being fixed to the outer surface of the cylindrical body and the other end. A ribbon-shaped screw blade whose portion is connected to the hollow shaft body is disposed over the entire length of the cylindrical body, and a liquid inlet for the liquid to be separated is formed at one end of the cylindrical body. A drainage channel for the separated liquid is formed at the cylindrical body, a solid material discharge port is formed at the other end of the cylindrical body, and a rotational drive device is provided to rotate the cylindrical body and the ribbon-shaped screw blade, respectively. be.

Function When the liquid to be separated is injected into one end of the rotating cylindrical body from the liquid inlet of the cylindrical body, solids are separated to the outside and liquid to the inside by centrifugal force. The separated solids are scraped out of the outlet by screw blades. On the other hand, the separated liquid is discharged from a drainage channel formed within the cylindrical body.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Reference numeral 1 denotes a cylindrical body rotatably provided around a horizontal axis, one end of which is a cylindrical part (sedimentation area) 1a, and the other end a conical part (dehydration area) 1b. . This cylindrical body 1
A first opening 2 is formed at one end, a second opening 3 is formed at the other end, and a solid material discharge port 4 is formed near the second opening 3. The cylindrical body 1 is supported by a frame (not shown) via bearings 7 and 8 mounted on flanges 5 and 6 that project outward from the ends of the openings 2 and 3. Reference numeral 9 denotes a cylindrical body with both ends open, which is inserted into the cylindrical body 1 from the first opening 2 of the cylindrical body 1 in a horizontal direction and at the rotational axis position of the cylindrical body 1, and the outer end thereof is inserted into the cylindrical body 1 at the rotation axis position of the cylindrical body 1. It is rotatably supported on a pedestal via. Also,
Reference numeral 11 denotes a hollow shaft body with both ends open, which is inserted horizontally into the cylindrical body 1 from the second opening 3 of the cylindrical body 1 and at the rotational axis position of the cylindrical body 1, and its outer end is a bearing. It is rotatably supported on a pedestal via 12. Reference numeral 13 denotes a ribbon-shaped screw blade without a central shaft portion, which is disposed over the entire length inside the cylindrical body 1, one end of which is fixed to the outer circumferential surface of the cylindrical body 9 inserted through the first opening 2, and the other The end is the second opening 3
It is connected to the hollow shaft body 11 inserted from the inside.
Reference numeral 14 denotes a small-diameter auxiliary cylindrical body fixedly disposed within the cylindrical body 9 with a predetermined gap, for example, by a stay (not shown), and both ends thereof are covered with lids 14a and 14b.
The annular gap between the auxiliary cylindrical body 14 and the cylindrical body 9 serves as a drainage channel 15 for the separated liquid. Further, a space chamber 16 is formed on the inner end side of the auxiliary cylindrical body 14, and a liquid inlet 17 formed in the vicinity of one end of the cylindrical body 1 of the cylindrical body 9 is connected to this space chamber 16. A liquid supply pipe 19 for supplying a liquid to be separated is inserted into the auxiliary cylindrical body 14 and connected via a connecting pipe 18 and whose tip opens into the space chamber 16 . 20 is a first rotational drive device for rotating the cylindrical body 1;
a first driven pulley 21 attached to the second opening side flange portion 6 of the first driven pulley 21, and a first driving pulley 23 interlocked with the first driven pulley 21 via a belt 22.
and a first drive pulley 23 that rotationally drives the first drive pulley 23.
It is composed of a motor 24. Reference numeral 25 designates a second rotation drive device for rotating the ribbon-shaped screw blade 13, which includes a second driven pulley 26 attached to the outer end of the hollow shaft body 11, and a second driven pulley 26 attached to the outer end of the hollow shaft body 11;
6 and a second drive pulley 28 interlocked with the belt 27 via a belt 27, and a second motor 29 that rotationally drives the second drive pulley 28. 30 is a cover provided to cover the cylindrical body 1;
A removal opening 31 is formed at the lower part of the solid material discharge port 4 side. Reference numeral 32 denotes a separated water drainage chute arranged corresponding to the outer opening of the cylindrical body 9. 33 and 34 are sealing materials interposed between the cylindrical body 1, the cylindrical body 9, and the hollow shaft body 11, respectively. Note that the liquid supply pipe 19 is inserted into the auxiliary cylindrical body 14 so as to be rotatable and slidable therein. In addition,
The direction of rotation of the ribbon-shaped screw blade 13 is, of course, the direction in which the solids move toward the discharge port 4 side.

Next, the separation effect will be explained.

In a state where the cylindrical body 1 and the ribbon-shaped screw blade 13 are rotating with a speed difference between them, the liquid A to be separated is supplied from the liquid supply pipe 19 to the space chamber 1.
6. When supplied to one end of the cylindrical body 1 from the liquid inlet 17 via the connecting pipe 18, the solid matter B is pressed and settled on the inner circumferential surface of the cylindrical body 1 due to centrifugal force. This settled solid matter B is successively scraped toward the discharge port 4 by the ribbon-shaped screw blades 13 and taken out from the take-out opening 31 of the cover 30. On the other hand, the separated liquid C enters the cylindrical body 9 and is discharged from the drainage chute 32 through the drainage channel 15. Incidentally, the protruding length of the cylindrical body 9 is set to such a length that the liquid to be separated will not be directly short-circuited to the drainage channel 15 until the liquid to be separated has a sufficient centrifugal effect. It also varies depending on the type. Furthermore, the rotational speed difference between the cylindrical body 1 and the ribbon-shaped screw blade 13 is appropriately selected depending on the type of liquid to be separated, sedimentation speed, etc. In this way, since the liquid to be separated A is injected from one end of the cylindrical body 1 on the side opposite to the solid matter discharge port 4, there is no disturbance in the settling region, and the separation and dehydration effect is improved.
Furthermore, by inserting, for example, a water level gauge 35 through the center hole of the hollow shaft body 11 and the ribbon-shaped screw blade 13, it is possible to know the state of the separated water within the cylindrical body 1. Furthermore, by inserting a pipe in the same manner, additives can be injected, a degassing sample inside the cylindrical body 1 can be taken out, etc.

In the above embodiment, the cylindrical body 1 has been described as being composed of the cylindrical portion 1a and the conical portion 1b, but it may be configured to have a conical shape as a whole, for example. Moreover, although the cylindrical body 1 and the ribbon-shaped screw blade 13 are rotated from the end portion on the side of the solid material discharge port 4, they may be rotated from the side of the separated water discharge chute, for example.

Effects of the invention With the above-mentioned configuration of the present invention, the liquid to be separated is injected into the end of the cylindrical body opposite to the solids discharge port, so compared to the conventional case where the liquid is supplied to the end of the settling zone. , the disturbing effect of settled solids can be almost eliminated. In addition, since the screw blades are ribbon-shaped without a central axis, the separated water can move more smoothly than conventional ones with a central axis, which prevents solids from floating. In addition, through the center hole of the hollow shaft and ribbon-shaped screw blade, it is possible to insert a water level gauge, inject additives, collect degassing samples, etc., and furthermore, operation management by external monitoring is easy. Can be done.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, in which FIG. 1 is an overall vertical sectional view, FIG. 2 is a view taken along the - arrow in FIG. 1, and FIG. 3 is a schematic overall view of the conventional example. FIG. DESCRIPTION OF SYMBOLS 1... Cylindrical body, 2... First opening, 3... Second opening, 4... Discharge port, 9... Cylindrical body, 11... Hollow shaft body, 13... Ribbon-shaped screw blade, 14...
... Auxiliary cylindrical body, 15 ... Drain channel, 17 ... Liquid inlet, 19 ... Liquid supply pipe, 20 ... First rotation drive device, 25 ... Second rotation drive device.

Claims (1)

[Scope of utility model registration request] A cylindrical body with openings formed at both ends is supported rotatably around a horizontal axis, and the cylindrical body is rotatably inserted into the cylindrical body from the opening on one end of the cylindrical body, and the other end is A hollow shaft is rotatably inserted through the opening, and a ribbon-shaped screw blade having one end fixed to the outer surface of the cylindrical body and the other end connected to the hollow shaft is inserted over the entire length of the cylindrical body. A liquid inlet for the liquid to be separated is formed at one end of the cylindrical body, a drainage channel for the separated liquid is formed in the cylindrical body, and a solid waste discharge channel is formed at the other end of the cylindrical body. A centrifugal separator, characterized in that it is provided with a rotational drive device that forms an outlet and rotates the cylindrical body and the ribbon-shaped screw blades, respectively.