| JP3742047 | CONNECTION DEVICE FOR WATER METER |
| JPS58218616 | FLOW RATE MEASURING DEVICE OF OPEN CHANNEL |
| JP2009115809 | FLOWMETER |
KARVINEN JUHA (FI)
| EP0134836A1 | 1985-03-27 | |||
| US5024084A | 1991-06-18 | |||
| DE3740603A1 | 1989-06-15 | |||
| US4195520A | 1980-04-01 |
| 1. | Apparatus for the measurement of liquid quantity inside a liquid separator, especially a water separator (1) in a paper machine, said liquid separator comprising a chamber space provided with at least one liquid/gas inlet duct (2) , at least one gas outlet duct (3) and at least one liquid outlet duct (4), characterized by a measuring receptacle (6) disposed in the chamber, into which receptacle liquid is passed from the inlet duct (2) and which comprises an inflow compartment (7), which is provided with means for collecting the liquid flowing in, and a measuring compartment (8) , with a path allowing liquid flow from the inflow compartment (7) into the measuring compartment, said measuring compartment (8) being provided with means for the measurement of liquid quantity, from which measuring compartment (8) the liquid is passed via the chamber space of the liquid separator into the outlet duct. |
| 2. | Apparatus as defined in claim 1, characterized in that the measurement of liquid quantity is performed in the measuring compartment (8) e.g. by the weir flow measuring principle known in itself. |
| 3. | Apparatus as defined in claim 1 or 2, characterized in that the measuring receptacle (6) is a separate body or is implemented as a part of the separator. |
| 4. | Apparatus as defined in any one of claims 1 3, characterized in that the measuring receptacle (6) is at least partially above the water surface (5) in the separator chamber. |
| 5. | Apparatus as defined in any one of claims 1 4, characterized in that the velocity of the liquid is slowed down in a smoothing compartment (7) . |
| 6. | Apparatus as defined in any one of claims 1 5, characterized in that air and water are separated in the smoothing compartment (7) . |
| 7. | Apparatus as defined in any one of claims 1 6, characterized in that the access of air from the smoothing compartment (7) into the measuring compartment (8) is blocked e.g. by means of a water seal. |
| 8. | Apparatus as defined in any one of claims 1 7, characterized in that the apparatus is so designed that it can be assembled inside a water separator. |
The present invention relates to an apparatus as defined in claim 1.
It is fairly common e.g. in paper machines and the like to use water separators built of concrete. Such water separators are usually the size of a small room. An air/water flow is passed into them by suction from at least one source. So far it has been very difficult to measure the amounts of water involved.
The object of the present invention is to achieve an apparatus which makes it possible to avoid the drawbacks of prior art and to measure the above-mentioned water quantities.
The invention is characterized by what is presented in the claims.
The apparatus of the invention has numerous significant advantages. Using this apparatus, it is possible to measure water quantities flowing into the liquid separator at a very high rate of flow. The invention also makes it possible to perform measurements inside water separators in paper machines, allowing a very high measurement accuracy to be achieved.
In the following, the invention is described by the aid of a preferred example by referring to the attached drawings, in which
Fig. 1 presents a sectioned side view of an apparatus as provided by the invention,
Fig. 2 presents the apparatus sectioned along line A - A in Fig. 1,
Fig. 3 presents a detail of Fig. 1, and
Fig. 4 presents a detail of Fig. 1 as seen from the direction of arrow B.
The water separator of paper machines and equivalent is formed e.g. in a chamber space delimited by walls 1. The walls may be made e.g. of concrete and the chamber space is of a size corresponding to a small room. A mixture of liquid and air is passed into the chamber space through at least one inlet duct 2 , preferably from the upper part of the chamber. In the chamber space, the liquid is separated and it is removed via at least one liquid outlet duct disposed in the lower part of the chamber, preferably by means of a pump device 4. The air is removed from the chamber preferably via an air outlet duct 3 disposed in the upper part of the chamber, preferably by means of a vacuum pump. The level 5 of the liquid gathered in the lower part of the chamber space is maintained below a desired maximum height e.g. by means of the pump device 4.
In the inlet duct 2, air and liquid flow at a high rate. The inlet duct 2 usually extends to the inside of the chamber space, and a part of the wall of the duct portion inside the chamber space has been removed, preferably the tube has been cut longitudinally in two halves over a certain length and one half of the tube thus split has been removed. This promotes the separation of air. Placed under the inlet duct 2 is
receptacle 6 for flow measurement. The receptacle is divided into two parts: an inflow compartment or a smoothing section 7, where the liquid is gathered into the receptacle and its velocity is slowed down, and a measuring section 8.
In an apparatus as illustrated by the figure, the liquid flow is slowed down by allowing the liquid to flow from the smoothing section 7 through an opening in the lower part of the partition 13 between the smoothing section and the measuring section 8, said opening extending across the whole width of the receptacle, into the measuring section 8. In the measuring section, the amount of water is determined e.g. by the weir flow metering technique known in itself. In this case, at least one of the walls of the measuring section 8 is provided with a gap 9 through which the liquid is passed onto the bottom of the chamber space. In the weir flow metering procedure, the measuring receptacle 6 is above the surface level 5 of the liquid on the bottom of the chamber space. The wall 13 is preferably used as a guide plate to pass the water down in a controlled manner. The lower edge of the plate 13 is below the lower edge of the gap 9, so the separated water will flow between the lower edge of the plate and the bottom of the receptacle. In this way, the flow is smoothed down and the water seal thus formed prevents the access of air into the measuring compartment of the receptacle.
The surface level (which is proportional to the flow rate) of the liquid gathered in the measuring receptacle is determined by using e.g. a differential pressure transmitter. The positive side of the differential
pressure transmitter is connected to a capillary tube 10 provided with a detector membrane 11 at one end of the tube. The negative side of the transmitter is connected to measure the vacuum variations inside the separator.
The chamber wall 1 is provided with an opening with a manhole 12. The manhole is usually smaller than the measuring receptacle 6 required. The measuring receptacle has been built to be assembled from parts that can be introduced into the chamber through the manhole.
It is obvious to a person skilled in the art that the invention is not limited to the embodiments described above, but that it can be varied within the scope of the attached claims.