JP2524262B2 - Circuit structure for flow rate measurement of liquid containing electric charge - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit structure for measuring a flow rate of a liquid containing an electric charge.

[0002]

2. Description of the Related Art This type of circuit structure is disclosed in German Laid-Open Publication No. 2
743954 (corresponding Japanese patent publication is Japanese Patent Publication No. 59-
No. 7929) .

[0003]

Particularly when using this kind of circuit structure for measuring the drainage flowing through a pipe element, it often happens that the inside of the pipe element is not completely filled with drainage. A siphon is necessary to keep the tube element filled with liquid at all times. This type of siphon, however, creates new resistance to the flow of liquid, and
Especially in the case of very wide tubular elements, the siphon is expensive to manufacture and is associated with the disadvantage.

It is known to provide several pairs of electrodes with which the measurement of the liquid level in the tube element can be made even more separately. However, making a new liquid level measurement of this kind is expensive.

It is an object of the present invention to provide a circuit structure of the above kind which obviates the need for a separate liquid level measurement even if the liquid level in the tube element is low.

[0006]

In order to achieve the above object, according to the present invention, a pipe element through which a liquid passes is constructed at least on the inside thereof with an electrically insulating material and is substantially At least two magnets, at least one of which is an electromagnet, to create a magnetic field passing diametrically through the liquid stream, and a line connecting the centers affected by charge transfer in the liquid is substantially relative to the tube element. Two electrodes that pass the liquid flow in a diagonal direction and substantially perpendicular to a line connecting the centers of the magnets,
A timing generator for controlling a polarity changing / breaking switch for the magnet on the one hand according to a sequence and, on the other hand, for controlling a distribution operation of a filter for selectively sending a measured voltage obtained from the electrode to one of a plurality of memories. Charge is provided, the memory corresponding to different switching modes of one of the magnets, and their outputs being connected to a correction circuit for processing the stored signal with empirical parameters and outputting the output signal. In a circuit structure for measuring a flow rate of a liquid, which comprises: at least two second electrodes are arranged below the electrodes, the second electrodes being influenced by charge transfer in the liquid and connecting their centers. line passes through substantially perpendicular to the liquid flow with respect to the center connecting line between substantially diagonally and the magnet relative to the tube element, the timing generator, the second collector The second plurality of the measurement voltage obtained from
Swing amount of the one of the memory of the second filter sending the selective
Further controls the only operation, the output of which together with the second memory corresponds to one of the different switching manner of said magnet,
The signals stored in the second memories are also connected to the correction circuit so as to generate an output signal from the correction circuit using the empirical parameter.

Further in accordance with the present invention, the first electrode is
Creates a magnetic field through the liquid stream for detection of the measured voltage
For detecting the measured voltage by the second electrode
To create a magnetic field through the liquid flow in
A pair of magnets is provided .

Further in accordance with the present invention, the first electrode
Creates a magnetic field through the liquid stream for detection of the measured voltage
For detecting the measured voltage by the second electrode
To create a magnetic field that passes through the liquid stream in
Magnets are provided and the different pairs of magnets are different from each other
It is characterized by having a magnetic field distribution characteristic .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows a tube element 1 whose inner side is made of an electrically insulating material and two electromagnets 2a, 2b which create a magnetic field which passes through this tube element 1 in a substantially diametrical direction. The two electrodes 3a, 3b, which are affected by the charge transfer in the liquid,
The line X connecting their centers makes the liquid flow in the tube element 1 substantially diametrical to the tube element 1 and the electromagnets 2a,
It is arranged so as to pass substantially orthogonal to a line Y connecting the centers of 2b. The electromagnets 2a and 2b have changed polarity.
It is connected to the power source unit 13 via the cutoff switches 4 and 5. With proper modification of this circuit, electromagnet 2
a and 2b can also be connected in series, and electromagnet 2a
Or to vary the excitation of 2b, and secondary winding thereof electromagnet 2a walking can also produce the opposite polarity as in the excitation by the primary winding provided 2b. The electrodes 3a and 3b are connected to the signal amplifier 6 whose output is connected to the signal filter 7. The timing generator 11 synchronously connects the polarity changing / breaking switches 4 and 5 to the output channel of the signal filter 7, and the output channel of the signal filter 7 is, for example, a signal memory when the electromagnets 2a and 2b have the same polarity. 8 to the signal memory 9 when the electromagnets 2a and 2b have opposite polarities, and to the signal memory 10 when the electromagnet 2b is in the off state. That is, the timing generator 11 is
On the other hand, according to a predetermined timing sequence A or B
Set the polarity change / break switches 4 and 5 for the electromagnets 2a and 2b.
Control and, on the other hand, the measurements obtained from the electrodes 3a, 3b.
Selective constant voltage to one of multiple signal memories 8, 9, 10
The distribution operation of the filter 7 to be sent to is controlled.

Since the signals stored in the signal memories 8, 9 and 10 are processed in the correction circuit 12 by using the empirical parameters, the output 14 of the correction circuit 12 leads to the pipe element 1.
A signal corresponding to the flow rate is output which is substantially unaffected by disturbances in the flow profile of the liquid inside, especially deviations in the rotationally symmetrical flow profile.

Two electrodes 3a 'and 3b' are further arranged below the electrodes 3a and 3b. These electrodes 3a ', 3
b'is affected by the charge transfer in the liquid, and the line X'connecting their centers makes the liquid flow in the tube element 1 substantially oblique to the tube element 1 and the electromagnets 2a, 2b. It passes substantially perpendicular to the center connecting line Y between them. The timing generator 11 further controls a second signal filter 7 ', which supplies the measured voltage obtained from the second electrodes 3a', 3b 'via the signal amplifier 6'to the signal memory 8 mentioned above. , 9 and 10, that is, a second signal memory 8'corresponding to different switching modes of the electromagnet 2b,
Send to 9 ', 10'. The outputs of these second signal memories 8 ', 9', 10 'are also connected to a correction circuit 12, which also uses the empirical parameters to output from the output 14 also by the signals stored in these memories . Flow rate
Output an output signal corresponding to .

By the way, each flow rate is determined by
Measurements obtained from the pair of electrodes 3a, 3b and 3a ', 3b'
The constant voltage depends on the flow profile of the fluid in the tube element 1.
The flow profile of the liquid level in the tube element 1.
(Depending on the degree to which the liquid is filled). And this
Flow profile, which depends on the liquid level, such as
The influence on the quantity value is different in the magnetic field in the tube element 1.
Status (see timing sequences A and B described later)
Correspondingly obtained pairs of electrodes 3a, 3b and 3a ', 3
Consider by evaluating the measured voltage (s) of b '
be able to.

Memories 8, 9, 10 and 8 ', 9', 10
Is a particular measurement taken during each measurement cycle.
It plays the role of storing a constant voltage, and each of these
Mori is assigned to the measured voltage obtained in a particular state of the magnetic field.
It is.

To determine the output signal of the correction circuit 12
In memory 8, 9, 10 and 8 ', 9', 10 '
The evaluation of each group of stored measured voltages is empirical.
Parameter. This in the correction circuit 12
Processing using such empirical parameters is
West Germany, which was clarified in the specification at the time of the application of the present application as prior art
Japanese Patent Publication No. 2473954 (corresponding Japanese patent publication
As disclosed in Japanese Patent Publication No. 59-7929)
It is well known in the prior art in the circuit structure for liquid flow measurement of the same type as Ming
For example, each group of measured voltages and the corresponding liquid
Empirical method to determine the functional relationship between level and predetermined value of flow rate
And the correction circuit 12 calculates the function
Using the empirical parameters obtained from the
Stored in 9, 10 and 8 ', 9', 10 'respectively
Based on each measured voltage, the flow profile
Output corresponding to flow rate, virtually unaffected by disturbance
A signal can be output. Such an empirical para
According to the processing method using the meter, the liquid level is 50-
Consider liquid level differences even in the 100% range
It is possible to measure the flow rate with care and thus
Above the plane X '(Fig. 1) of the pair of electrodes 3a' and 3b '
Flow measurements can be made for each of the liquid levels.

In the embodiment of FIG. 1, a pair of common electromagnets 2 is used.
a, 2b are associated with two signal filters 7, 7 '. That is, for detecting the measured voltage by the first electrodes 3a, 3b
To create a magnetic field passing through the liquid flow in the tube element 1,
Also, the measurement of the measured voltage by the second electrodes 3a 'and 3b' is performed.
Common to create a magnetic field that passes through the liquid stream for output
A pair of magnets 2a and 2b are provided.

On the other hand, in the embodiment of FIG. 2, different electromagnets 2
a, 2b and 15a, 15b are associated with two filters 7 and 7 ', one pair of electromagnets 15a, 15a
b is optimized for measuring the liquid level when the tube element 1 is partially filled with liquid. That is, the first
In the tube element 1 for detecting the measured voltage by the electrodes 3a, 3b
To create a magnetic field passing through the liquid stream, and also to the second
Electrodes 3a ', 3b' the liquid for detection of the measurement voltage by
Different pairs of magnets 2 to create a magnetic field passing through the flow
a, 2b and 15a, 15b are provided, and
The pair of magnets 2a, 2b and 15a, 15b are different from each other.
It has the following magnetic field distribution characteristics.

The operation of the present invention is based on the principle that when the tube element 1 is partially filled with liquid, the valence distribution is disturbed as a result of which the dielectric flowmeter exhibits different measured values. There is.

The liquid level in the tube element 1 depends on the electrodes 3a, 3
It is also possible to calculate by b, 3a ', 3b' and the voltage sent from another electrode.

The operation of the circuit structure described above will be explained in detail below. 1. A pair of electromagnets 2a, 2b and a pair of electrodes 3a, 3
b. Operation 1.1 Standards of use Whenever the tube element 1 is completely or almost completely filled with liquid, the measuring mechanism is usually equipped with a pair of electromagnets 2a, 2
b and the pair of electrodes 3a and 3b. In this case, the measuring mechanism automatically calculates the required liquid level. The pair of electromagnets 2a, 2b are optimized for the tube element 1 in which the magnetic field distribution is filled with liquid. (In this respect, it is meaningless to draw the coil flat in FIGS. 1 and 2.) 1.2 The following measurement cycles (timing sequences) are valid: 1.2.1 Timing sequence A 1 ) Both electromagnets 2a and 2b are simultaneously excited with the same polarity for the entire period. The measured value obtained during this period by the pair of electrodes 3a and 3b is sent to the signal memory 8 via the signal filter 7.

2) Only the electromagnet 2a is excited for the entire period,
The measured values obtained by the pair of electrodes 3a and 3b are sent to the signal memory 9 via the signal filter 7.

3) Only the electromagnet 2b is excited for the entire period,
The measurement values obtained by the pair of electrodes 3a and 3b are sent to the signal memory 10 via the signal filter 7.

The order of steps 1) to 3) may be changed as necessary. 1.2.2 Timing Sequence B 1) Both electromagnets 2a and 2b are simultaneously excited with the same polarity for the entire period. The measured value obtained during this period by the pair of electrodes 3a and 3b is sent to the signal memory 8 via the signal filter 7.

2) Both electromagnets 2a and 2b are simultaneously excited with opposite polarities for the entire period. The measured value obtained during this period by the pair of electrodes 3a and 3b is sent to the signal memory 9 via the signal filter 7. Signal memory 10 is not needed in this timing sequence. 2. A pair of electromagnets 2a, 2b and a pair of electrodes 3a ',
Operation according to 3b ′ 2.1 Standards of use Whenever the liquid is only partially filling the tube element 1, especially below 50%, the electrodes 3a, 3b do not record the measuring voltage, so the measuring mechanism is Usually a pair of electromagnets 2
a, 2b and a pair of electrodes 3a ', 3b'.
The installation height of the pair of electrodes 3a ', 3b' determines the lower limit of the measurable liquid level of the measuring mechanism. 2.2 The following measurement cycle (timing sequence) is valid: 2.2.1 Timing sequence A 1) Both electromagnets 2a, 2b are simultaneously excited with the same polarity for the whole period. The measured values obtained during this period by the pair of electrodes 3a ', 3b' are sent to the signal memory 8'via the signal filter 7 '.

2) Only the electromagnet 2a is excited for the entire period,
The measured values obtained by the pair of electrodes 3a 'and 3b' are sent to the signal memory 9'through the signal filter 7 '.

3) Only the electromagnet 2b is excited for the entire period,
The measured values obtained by the pair of electrodes 3a 'and 3b' are sent to the signal memory 10 'via the signal filter 7'.

The order of steps 1) to 3) may be changed as necessary. 2.2.2 Timing sequence B 1) Both electromagnets 2a and 2b are simultaneously excited with the same polarity for the entire period. The measured values obtained during this period by the pair of electrodes 3a ', 3b' are sent to the signal memory 8'via the signal filter 7 '.

2) Both electromagnets 2a and 2b are simultaneously excited with opposite polarities for the entire period. The measured values obtained during this period by the pair of electrodes 3a ', 3b' are sent to the signal memory 9'via the signal filter 7 '. Signal memory 10 'is not needed in this timing sequence. 3. A pair of electromagnets 15a and 15b and a pair of electrodes 3
Operation by a ', 3b' 3.1 Standard of use Whenever the liquid in the tube element 1 is only partially filled, an alternative means is to use a pair of electromagnets 15a, 15b and a pair of electrodes 3a ', 3b'. A measuring mechanism can be used. The conditions are therefore the same as in section 2 above, except that another pair of electromagnets is used. A pair of electromagnets 1
5a and 15b differ from the pair of electromagnets 2a and 2b in terms of magnetic field distribution as long as they are optimized for the tube element 1 partially filled with liquid. 3.2 The following measurement cycle (timing sequence) is valid: 3.2.1 Timing sequence A 1) Both electromagnets 15a, 15b are simultaneously excited with the same polarity for the entire period. The measured values obtained during this period by the pair of electrodes 3a ', 3b' are sent to the signal memory 8'via the signal filter 7 '.

2) Only the electromagnet 15a is excited for the entire period, and the measured values obtained by the pair of electrodes 3a 'and 3b' are sent to the signal memory 9'through the signal filter 7 '.

3) Only the electromagnet 15b is excited for the entire period, and the measured values obtained by the pair of electrodes 3a 'and 3b' are sent to the signal memory 10 'via the signal filter 7'.

The order of the above steps 1) to 3) may be changed as necessary. 3.2.2 Timing sequence B 1) Both electromagnets 15a and 15b are simultaneously excited with the same polarity for the entire period. The measured values obtained during this period by the pair of electrodes 3a ', 3b' are sent to the signal memory 8'via the signal filter 7 '.

2) Both electromagnets 15a and 15b are simultaneously excited with opposite polarities for the entire period. A pair of electrodes 3a ', 3
The measured value obtained during this period by b'is sent to the signal memory 9'via the signal filter 7 '. Signal memory 1
0'is not needed in this timing sequence.

The optimization of the magnetic field mentioned several times in the above description should be understood as follows: As shown in FIG. 2, the coil 15a has a smaller diameter than the coil 15b. As a result, the magnetic field in the upper half of the tube element 1 is stronger than the magnetic field in the lower half. This qualitative characteristic becomes a decisive factor in the process of "optimization", and the magnetic field is
Is weakened from the top to the bottom in the plane at the center in the longitudinal direction.

[0033]

As described above, according to the present invention, at least two second electrodes are further provided in the tube element, the measured voltage from these second electrodes is received, and the switching mode of the magnet is dealt with. Since the second memory provided is connected to the correction circuit, even if the liquid level in the tube element is low, the measurement can be performed without using a special measuring device, and the cost and the structure can be reduced. Will be realized.

[Brief description of drawings]

FIG. 1 is an example of a circuit structure.

FIG. 2 is an example of a magnet that creates a magnetic field with a design different from that of FIG.

[Explanation of symbols]

1 Tube elements 2a, 2b, 15a, 15b Electromagnets 3a, 3b, 3a ', 3b' Electrodes as magnets 4, 5 Polarity changing / breaking switches 7, 7 'Filters 8, 9, 10, 8' , 9 ', 10' memory 11 timing generator 12 correction circuit X, Y, X'center connection line

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hans Weschwiedelski Die 3412 Nerten-Haldenberg Obererdorf Strasse 28

Claims (3)

(57) [Claims] 1. A pipe element (1) through which a liquid passes is constructed at least on the inside by an electrically insulating material, and a magnetic field passing a liquid flow in a substantially diametrical direction with respect to the pipe element (1) is provided. To create, at least two magnets (2a, 2b), at least one of which is an electromagnet, and a line (X) connecting the centers, which is influenced by charge transfer in the liquid, is substantially relative to the tube element (1). Diagonally and the magnet (2
a, 2b) with two electrodes (3a, 3b) passing through the liquid stream substantially orthogonal to a line (Y) connecting the centers of the magnets (2a) according to a predetermined timing sequence. , 2b) polarity change / break switch (4,
5) and on the other hand the electrodes (3a, 3b)
The measured voltage obtained from the multiple memories (8, 9, 10)
A timing generator (11) for controlling the distribution operation of the filter (7) selectively sent to one of the magnets (8, 9, 10), and the memory (8, 9, 10) for switching one of the magnets (2a, 2b) differently. A circuit structure for measuring the flow rate of a liquid containing a charge, the circuit structure corresponding to an aspect and having their outputs connected to a correction circuit (12) for processing an accumulated signal using an empirical parameter to output an output signal, Below the electrodes (3a, 3b) at least two second electrodes
Electrodes (3a ', 3b') of the second electrode (3a ', 3b') are affected by charge transfer in the liquid and the line (X ') connecting their centers is the tube element. The magnets (2a, 2b) are substantially oblique to (1) and
Central connecting line between (Y) to substantially perpendicular passes through the liquid stream, said timing generator (11), said second electrode (3a ', 3b') of the measured voltage obtained from The distribution operation of the second filter (7 ') for selectively sending to one of the plurality of second memories (8', 9 ', 10') is further controlled, and the second operation is further controlled. The two memories (8 ', 9', 10 ') correspond to different switching modes of one of the magnets (2a, 2b) and their outputs are connected to the second memories (8', 8 ', 9b).
9 ', 10') is also connected to the correction circuit (12) in order to generate an output signal from said correction circuit (12) using empirical parameters by means of an empirical parameter. Circuit structure for liquid flow rate measurement including liquid. 2. Measurement by the first electrode (3a, 3b)
Create a magnetic field through the liquid stream for the detection of a constant voltage
In addition, the measurement by the second electrodes (3a ', 3b')
Create a magnetic field through the liquid stream for the detection of a constant voltage
Therefore, a common pair of magnets (2a, 2b or 15a, 1
5b) is provided , The circuit structure for flow rate measurement of the liquid containing charge according to claim 1. 3. Measurement by the first electrodes (3a, 3b)
Create a magnetic field through the liquid stream for the detection of a constant voltage
In addition, the measurement by the second electrodes (3a ', 3b')
Create a magnetic field through the liquid stream for the detection of a constant voltage
Therefore, different pairs of magnets (2a, 2b; 15a, 15b)
Are provided for the different pairs of magnets (2a, 2b; 15
2. The circuit structure for measuring the flow rate of a liquid containing electric charges according to claim 1, wherein a and 15b) have different magnetic field distribution characteristics .