JPH07502454A - centrifuge - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] centrifuge The present invention relates to a centrifugal separator equipped with a rotor, the rotor having multiple components. an inlet chamber for a liquid mixture to be mixed with a liquid mixture, and a separation chamber connected to the inlet chamber. and through a flow path to receive the liquid to be separated in the separation chamber during operation. forming an outflow chamber connected to the separation chamber; The bar is a fixed, radially inwardly directed The rotating liquid is configured to form a rotating liquid having a liquid surface that does not change. The centrifugation The vessel further includes a fixed ejector, the ejector discharging the liquid from the central mountain. extending radially inwardly to " ] and having at least one outflow passage formed therein. one end of the outlet has an inlet located within the liquid, and the other end has an inlet located within the liquid. The end opens into an outlet connected to an ejector. In addition, centrifugal separators means connected to the rotor, the means being connected to the outflow chamfer during operation of the rotor; The separation liquid in the chamber is drawn into the rotation of the rotor, and at the same time installed to direct the outward flow of such liquid into the inlet of the outflow channel; ing.

In conventional centrifuges of this type, the flow path from the separation chamber is fixed. It opens into an outflow chamber at a level radially inward of the liquid surface that is not exposed. spill The chamber has a number of wings with axial and radial extensions that connect the outflow chamber. arranged so as to be fixedly connected to the walls delimiting the chamber. Leaked Chan The separated liquid that enters the bar is therefore blown radially outward and is not directly fixed. After impacting the liquid surface or impacting one of said wings, further radial The inlet of the outflow path for the 0-rotation liquid that is blown onto the liquid surface that is not fixed outwardly. The flow of separated liquid radially outwards to the edge of the outflow chamber through the wing as L. It occurs in a thin layer along one of the walls.

Collision between the separated liquid and an unfixed liquid surface or collision between the liquid and the wing as described above The splash creates droplets that flow radially outward to the inlet of the outflow channel and then to the outlet. The flowing separation liquid is radially inward of the unfixed liquid surface in the outflow chamber. There is a high risk of air or gas being mixed in. A partially high-velocity phenomenon that occurs near an unfixed liquid surface in a layer in which the liquid flows in one direction. Liquid flow also increases the risk of air or gas contamination.

To reduce the high velocity of liquid flow in the layer where liquid flows radially outward, As shown in WO 89103250Al, the liquid is wound around the rotation of the rotor. Means in the outflow chamber have already been presented, but the means may be fixedly connected to the rotor. configured as at least one disk connected to the rotor and concentric with the rotor; ing. This allows the outwardly directed liquid flow within the outflow chamber to have a large total cross-section. distributed into many layers with a product of The risk of air entrainment is also reduced. However, the proposed known solutions It is also possible that at least one of the discs according to the invention sufficiently reduces air entrainment. Sometimes it is not possible to satisfactorily entrain the separation liquid in the rotation of the rotor.

The object of the invention is a centrifugal separator of the type originally described, which comprises a centrifugal separator for discharging a separated liquid. The risk of air entrainment to the body is lower than with conventionally known centrifuges of this type. Providing a centrifugal separator capable of entraining separated liquid in an outflow chamber That's true.

This purpose is such that the means for entraining the separation liquid in the outflow chamber during operation of the rotor is having several elongated elements arranged around an axis of rotation and rotating with the rotor This is achieved by the present invention, wherein the elongated elements have an axial, semi-axial A flow space is formed which extends radially and circumferentially of the rotor.

In preferred embodiments of the invention, the elongate elements are straight and essentially axial. regularly oriented in the direction, but can instead be oriented radially Both are iJ Noh.

Also, in other embodiments of the invention, the elongate elements are randomly oriented; Advantageously, they abut each other.

In a special embodiment of the invention, the elongated element is connected to the rotor. This wing can be supplemented by at least one wing, which radius within the outflow chamber in such a way that effective liquid entrainment within the chamber is obtained. and extends in the axial direction.

The invention will be explained in more detail below with reference to the accompanying drawings, in which: FIG.

FIG. 1 schematically shows an axial cross-section of a part of a centrifugal separator according to the invention. .

FIG. 2 is a detailed view of a part of the centrifuge according to the invention.

FIG. 3 is a cross-sectional view along line III-II+ in FIG.

The part of the centrifugal separator shown in Figure 1 has a rotor that cannot be tightened. It has a lower part 1 and an upper part 2 which are connected to each other by a ring 3. inside the rotor An axially movable slide valve 4 is attached to the section. This slide valve is connected to -L section 2. together delimiting the separation chamber 5 and controlling the flow between the separation chamber 5 and the outlet opening 6 The exit path is opened and closed to separate the mixture from the mixture supplied to the rotor into a separation chamber. It is installed to intermittently release the components accumulated around the area. Slippery The valve 4 also delimits a closure chamber 7 with the lower part 1, which includes a seal. An inlet and a throttle outlet for chain fluid are provided. These inlets and outlets are shown in the diagram. Not yet.

Inside the separation chamber 5 is a disk stack consisting of a number of conical separation disks. A rack 8 is arranged between the distributor 9 and the upper part 2. The upper part 2 is In the drawing shown, an outflow chamber 10 is formed at the upper end of the outflow chamber 10, and during operation, the flow A liquid with a lighter specific gravity separated from the mixture supplied to the tank is passed through the flow path 11. can flow from the separation chamber 5 to the effluent chamber 10 and within the effluent chamber 10. , an unfixed liquid directed radially inward at a certain radial level Forms a rotating liquid with a body surface. The outflow chamber lO has two axial end walls 1 2 and 13 and a circumferential wall 14 extending between them. It will be done.

A fixed inflow pipe 15 is installed through the center of the outflow chamber 10, and The inflow pipe 15 opens into the distributor 9 . The circumference of this inflow pipe 15 For lighter liquids in the mixture to be supplied, a fixed outlet tube 16 is provided. is attached to.

This outflow tube 16 extends into the outflow chamber IO.

Inside the outflow chamber 10, a fixed evacuation device 17 is arranged around the inflow pipe 15. It is placed. A discharge device 17 extends radially inwardly from the rotating liquid into the inlet tube 15. At least one outflow passage 18 is formed inside the ejection device 17, and one end thereof is has a peripheral inlet 19 and the other end opens into the interior of the outlet tube 16 .

Inside the outflow chamber 18, means 20 are fixedly connected to the end walls 12 and 13. It is installed so that These means 20, during operation, drain the outflow chamber IO It is installed so that the liquid inside is involved in the rotation of the rotor, and the liquid inside is The radially outward flow enters the inlet 19 of the outlet passage 18 .

2 and 3 show in more detail the construction of said means 20 according to the present invention. According to an embodiment, the means 20 comprise an annular disk 21, which disk It is fixedly connected to the end wall 12 or 13 concentrically to the axis of rotation. fixed exhaust On the axial side of the disc facing towards the exit bag g17 there are several elongated elements. children 22 are arranged around the rotational axis, and there are axially, radially, and 9 and 9 forming a flow space extending circumferentially of the rotor. In the embodiment, the elongate elements 22 are fixedly connected to each other via the disc 21. and is oriented in the axial direction. The flow spaces between the elongated elements 22 are fixed It is open in the direction of the discharge device 17 that is opened.

The means 20 shown by way of example for increasing the entrainment capacity of said means , further comprising three wings fixedly connected to the disc 21, These wings extend radially and axially within the outflow chamber lo. There is.

A centrifuge constructed in accordance with the present invention operates as follows. That is, When the centrifuge starts, the rotor rotates and the separation chamber 5 opens at the inlet (not shown). The sealing chamber 7 is closed by supplying sealing liquid to the sealing chamber 7 through (not shown).

After the separation chamber 5 is closed, the liquid mixture to be treated with centrifugal force enters the inlet tube. 15 and distributor 9 to the separation chamber 5. The chamber 5 is gradually filled, the rotor reaches its operating speed, and the separation chamber The internal condition becomes stable. Each component contained within a liquid mixture acts on this liquid. separated under the influence of centrifugal force.

Separation then occurs primarily in the spaces between the conical discs within the disc stack 8 During zero separation, the heavier components are blown radially outward into the separation chamber. The lighter specific gravity liquids accumulate in the radially outermost parts, while the lighter specific gravity of these Flows radially inward in space.

Components with heavier specific gravity are kept in the surrounding area for a certain period of time by moving the slide valve 4 during one operation. It is discharged intermittently by opening the outflow opening 6.

The liquid with a lighter specific gravity flows out from the separation chamber 5 via the flow path 11 into the chamber lO. a fixed radially inwardly oriented flow chamber; forming a rotating liquid with a liquid surface that does not The liquid in the outflow chamber 10 It enters the fixed discharge bag fi17 via the inlet port 19 of is discharged. The entrainment of the liquid in the outflow chamber IO is caused by rotation with the rotor. by the means 20 that Crabs are occurring. The liquid located closest to the discharge device 17 is Contact with an external surface causes a reduction in speed. Thereby, the outflow chamber I Different portions of the liquid volume within O obtain different rotational speeds. liquid and discharge device 17 The contact with the outer surface generates a circulating flow in the outflow chamber IO and the liquid flows into the outflow bag Wt Flows radially inward along the outer surface of 17, and flows radially outward in layers. However, these layers extend along the elongate elements 22 and bind the elongate elements 22 together. It also extends along the inner surface of the wall of the outflow chamber 10 .

If the means further comprises wings, the liquid may further be layered along the wings. Flows radially outward.

This radially outward flow is distributed over a relatively large number of layers. Do it like this This allows the local maximum flow velocity to be kept low, which means that This is particularly important in cases where the risk of air entrainment is particularly high.

The flow path 11 is installed at basically the same radius as the radius where the inlet 19 of the outflow path 18 is located. radially outwardly directed flow within the outflow chamber 10. It should be considered as an internal circulation.

However, when 5 the various liquids inside the separation chamber 5 at the desired radius In order to maintain the level of It will be necessary to place it inside. At this time, the position of this flow path II is directed outward in the radial direction. An addition is added to create a directed flow.

Continuation of front page (72) Inventor Fransen, Peter Sweden Varnish - 14600 trees Inge Mohnstovegen 22 (72) Inventor Inge, Claes Sweden Nis-13150 Saltsjod Uvnes, Christinave -gen 15 (72) Inventor Lagerstedt, Truigny Sweden Varnish-113 52 Stockholm Döbernsgatan 89 (72) Inventor Mauberg , Hans Sweden Nis-11647 Stockholm Bermansgatan 21 ．． 2 tails

Claims (9)

[Claims] 1. - an inlet chamber for a liquid mixture having multiple components and connected to the inlet chamber; a separation chamber (5) in which the liquid is separated in said separation chamber during operation; An outflow channel is connected to the separation chamber via a channel (11) for receiving the a chamber (10), the outflow chamber being such that during operation the liquid within it is Forming a rotating liquid with an unfixed liquid surface directed radially inward a rotor configured to - extending radially inward from said liquid to a central outlet and having at least Another outlet (18) is formed, one end of which is in the liquid. having an inlet (19) located at the other end connected to a fixed evacuation device (17) - said fixed ejector (17) opening to an outlet of said rotor; During operation, the separation liquid in the outflow chamber (10) is drawn into the rotation of the rotor. attached and at the same time the radial outward direction of such liquid in the outflow chamber (10) is connected to said rotor and admits the flow of water into the inlet (19) of the outlet passage (18). means (20) for In a centrifuge containing Said means (20) are arranged around an axis of rotation and rotate with the rotor. elongate elements (22), each having an axial and radial forming a flow space extending in the direction of the rotor and in the circumferential direction of the rotor. centrifuge. 2. characterized in that said elongate elements (22) are fixedly connected to each other. The centrifugal separator according to claim 1. 3. The elongate elements (22) are oriented straight and essentially regularly. The centrifugal separator according to claim 1 or 2, characterized in that: 4. At least some of said elongated elements (22) are oriented essentially axially. The centrifugal separator according to claim 2 or 3, characterized in that: 5. At least some of said elongate elements (22) are oriented essentially radially. The centrifugal separator according to claim 2 or 3, characterized in that: 6. characterized in that said elongate elements (22) are essentially randomly oriented; The centrifugal separator according to claim 1 or 2, characterized in that: 7. Claim characterized in that said elongated elements (22) abut each other. 6. The centrifugal separator according to 6. 8. The means further includes at least one wheel fixedly connected to the rotor. (23), the wings extending radially within the outflow chamber (10). and extending in the axial direction. centrifuge. 9. said flow space is open in the direction of a fixed evacuation device (17); A centrifugal separator according to any one of the preceding claims, characterized in that: