JP6777452B2 - Conductor concentration measuring device - Google Patents

Description

The present invention relates to a conductor concentration measuring device.

Generally, in a device such as an engine having a reciprocating component such as a piston, sliding of the piston with respect to the cylinder causes wear of the piston and the cylinder, and a conductor such as iron powder is generated. When such a conductor is generated, the conductor is mixed in the flow path through which the lubricating oil from the device flows. Therefore, the concentration of the conductor contained in the lubricating oil in the flow path is appropriately measured, and the device It is necessary to accurately grasp the wear condition of.

Conventionally, when grasping the wear state of equipment, the concentration of the conductor is measured by manually sampling the measurement target fluid such as lubricating oil by a chemical method, or near the flow path through which the lubricating oil flows. A conductor concentration measuring device is arranged in the vehicle to measure the concentration of the conductor.

Here, as an example of a magnetic material concentration measuring device among the conductors, a magnetic field applying means and a magnetic measuring means including a magnetic sensor by a superconducting quantum interference element are provided in the vicinity of the conduit through which the material to be inspected flows. , Some detect only the magnetic field of the magnetized magnetic component (see, for example, Patent Document 1).

Further, as another example of the magnetic material concentration measuring device, an LC oscillation circuit for actual measurement in which the first coil is arranged near the piping of the measurement target fluid and a position not affected by the magnetic material mixed in the measurement target fluid It is equipped with an LC oscillation circuit for correction with a second coil arranged in it, and the concentration of the magnetic material is converted by finding the difference between the oscillation frequency of the LC oscillation circuit for actual measurement and the oscillation frequency of the LC oscillation circuit for correction. (See, for example, Patent Document 2).

However, as described above, manually sampling the fluid to be measured such as lubricating oil and measuring the concentration of the conductor by a chemical method is very troublesome and continuous measurement cannot be performed. There was a problem. Further, only the magnetic field of the magnetic substance component is detected as disclosed in Patent Document 1, or the concentration of the magnetic substance is converted by a mere difference in oscillation frequency as disclosed in Patent Document 2. It has been difficult to measure the concentration of a non-magnetic conductor such as stainless steel or aluminum.

Therefore, the concentration of a non-magnetic conductor as well as a magnetic material can be measured with high accuracy, and the concentration of the conductor contained in the measurement target fluid can be continuously measured. A measuring device has been filed by the present inventor and the like (see Patent Document 3).

Japanese Unexamined Patent Publication No. 10-268013 Japanese Unexamined Patent Publication No. 2005-83897 Japanese Patent No. 5155588

However, in the prior art disclosed in Patent Document 3 described above, the fluid derivation / entry means is provided by equipping the conductor concentration measuring device with a rotation driving device (motor) as an external power source. Since the measuring piston is moved forward and backward, the outer shape of the entire device becomes large, which is a major obstacle when the conductor concentration measuring device is retrofitted to the existing equipment, and improvement has been desired.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a conductor concentration measuring device capable of downsizing the device and improving mountability.

The present invention relates to a pipe through which a fluid to be measured including a conductor is circulated.
A measuring cylinder having a first cylinder chamber and a second cylinder chamber partitioned by a measuring piston that is slidably inserted and the pipe is connected to the first cylinder chamber and the second cylinder chamber.
A switching valve that alternately introduces and derives the fluid to be measured from the pipe into the first cylinder chamber and the second cylinder chamber to reciprocate the measurement piston.
An exciting coil provided in the measuring cylinder so as to be arranged on the outer peripheral portion of at least one of the first cylinder chamber and the second cylinder chamber.
The measuring cylinder is provided on the outer peripheral portion of at least one of the first cylinder chamber and the second cylinder chamber so as to be adjacent to the exciting coil, and when an alternating current flows through the exciting coil, an exciting voltage is applied. Output coil that generates
It is provided with a signal processor for obtaining the concentration of the conductor based on the signal from the exciting coil and the output coil.
The signal processor
When the measurement target fluid is introduced into the measurement cylinder by switching the switching valve, the conductor detection signal is acquired from the output coil, and the reference signal of the same frequency is prepared from the exciting coil to prepare the conductor. The phase difference between the detection signal and the reference signal is detected by the lock-in amplifier, and the detected phase difference is converted into a DC voltage signal as an output value for the concentration of the conductor.
When the measurement target fluid is derived from the measurement cylinder by switching the switching valve, a correction detection signal is acquired from the output coil, and a reference signal having the same frequency is prepared from the exciting coil to detect the correction. The phase difference between the signal and the reference signal is detected by the lock-in amplifier, and the detected phase difference is converted into a DC voltage signal as a reference output value for comparison.
It is configured to obtain the concentration of the conductor based on the difference between the output value for the concentration of the conductor and the output value for comparison .
The pipe is connected to a tank in which a fluid to be measured including a conductor is stored.
A pump provided in the middle of the pipe and pumping the fluid to be measured stored in the tank is provided.
The pipe is connected to a first pipe in which a first measurement target fluid containing a conductor is stored and a second tank in which a second measurement target fluid including a conductor is stored. Equipped with two pipes
The pumps are a first pump provided in the middle of the first pipe and pumping a first measurement target fluid stored in the first tank, and a first pump provided in the middle of the second pipe and stored in the second tank. Equipped with a second pump that pumps the fluid to be measured
The switching valve is a first that is provided in the middle of the first piping and introduces and draws out the first measurement target fluid that is pumped by the first pump into the first cylinder chamber to reciprocate the measurement piston. The switching valve and the second switching target fluid provided in the middle of the second piping and pumped by the second pump are led out and introduced into the second cylinder chamber to reciprocate the measuring piston. Equipped with a valve
The exciting coil includes a first exciting coil provided in the measuring cylinder so as to be arranged on the outer peripheral portion of the first cylinder chamber, and the measuring cylinder so as to be arranged on the outer peripheral portion of the second cylinder chamber. Equipped with a second excitation coil provided in
The output coil is provided in the measuring cylinder so as to be arranged adjacent to the first exciting coil on the outer peripheral portion of the first cylinder chamber, and is excited when an alternating current flows through the first exciting coil. The first output coil that generates a voltage and the measurement cylinder are provided on the outer peripheral portion of the second cylinder chamber so as to be adjacent to the second excitation coil, and the second excitation coil is AC. Equipped with a second output coil that generates an exciting voltage when a current flows,
The signal processor is a conductor concentration measuring device characterized in that the concentration of a conductor contained in the first measurement target fluid and the concentration of a conductor contained in the second measurement target fluid are obtained. It depends on.

The conductor concentration measuring device includes a position sensor that detects that the measuring piston has reached the stroke end position in the reciprocating motion and outputs a signal.
The signal processor and the switching valve can be configured to operate based on the signal output from the position sensor.

According to the conductor concentration measuring device of the present invention, it is possible to obtain an excellent effect that the device can be miniaturized to improve the mountability.

It is a schematic block diagram which shows the reference example of the conductor concentration measuring apparatus of this invention, and is the figure which shows the state which introduced the fluid to be measured into the 1st cylinder chamber. It is a schematic block diagram which shows the reference example of the conductor concentration measuring apparatus of this invention, and is the figure which shows the state which derived the fluid to be measured from the 1st cylinder chamber. It is a block diagram which shows the signal processor in the reference example of the conductor concentration measuring apparatus of this invention. It is a flowchart of the reference example of the conductor concentration measuring apparatus of this invention. In the reference example of the conductor concentration measuring apparatus of this invention, it is a diagram which shows the signal waveform at the time of deriving the fluid to be measured. In the reference example of the conductor concentration measuring apparatus of this invention, it is a diagram which shows the signal waveform at the time of introduction of the fluid to be measured. It is a schematic block diagram which shows the Example of the conductor concentration measuring apparatus of this invention, and shows the state which introduced the 1st measurement target fluid into the 1st cylinder chamber, and derived the 2nd measurement target fluid from a 2nd cylinder chamber. It is a figure. It is a schematic block diagram which shows the Example of the conductor concentration measuring apparatus of this invention, and shows the state which derived the 1st measurement target fluid from the 1st cylinder chamber, and introduced the 2nd measurement target fluid into the 2nd cylinder chamber. It is a figure.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 to 3 are reference examples of the conductor concentration measuring device of the present invention.

In the case of the reference example , as shown in FIGS. 1 and 2, the fluid L to be measured including the conductor is stored in the tank T. The fluid L to be measured is, for example, lubricating oil for equipment such as an engine, and the tank T is like an oil pan in which the lubricating oil is stored.

A pipe PL is connected to the tank T, and a pump P for pumping the measurement target fluid L stored in the tank T is provided in the middle of the pipe PL.

The pipe PL is connected to the first cylinder chamber C1 and the second cylinder chamber C2 of the measuring cylinder C. The first cylinder chamber C1 and the second cylinder chamber C2 of the measuring cylinder C are partitioned by a measuring piston PS that is slidably inserted and inserted.

A switching valve V such as a solenoid valve is provided in the middle of the piping PL, and the fluid L to be measured, which is pumped by the pump P by switching the switching valve V, is sent to the first cylinder chamber C1 and the second cylinder chamber C1 and the second. The measurement piston PS is reciprocated by alternately introducing and deriving the measurement piston PS into the cylinder chamber C2. In FIGS. 1 and 2, the CV is a check valve, and when the pressure in the pipe PL on the discharge side of the pump P rises above the set pressure, the check valve CV opens and the pressure is applied to the tank T. Is designed to escape.

The measuring cylinder C is provided with an exciting coil EC so as to be arranged on the outer peripheral portion of the first cylinder chamber C1, and an output coil OC is provided adjacent to the exciting coil EC. It is provided. The output coil OC is adapted to generate an exciting voltage when an alternating current flows through the exciting coil EC.

Then, the concentration of the conductor is obtained in the signal processor 100 based on the signals from the exciting coil EC and the output coil OC. The signal processor 100 is connected to an abnormality determining device 200 that displays the concentration of the conductor and determines the presence or absence of an abnormality in equipment such as an engine according to the concentration of the conductor.

Further, the measurement cylinder C is provided with a position sensor 300, and the position sensor 300 detects grooves g1 and g2 recessed on the outer periphery of both ends of the measurement piston PS, so that the measurement piston PS reciprocates. It is configured to detect that the stroke end position has been reached and operate the signal processor 100 and the switching valve V based on the signal output from the position sensor 300.

On the other hand, as shown in FIG. 3, the signal processor 100 includes an amplifier circuit 101, a bandpass filter 102, a sine wave oscillation circuit 103, a phase circuit 104, an edge trigger circuit 105, and a lock-in amplifier 106. It includes a low-pass filter 107, an amplifier 108, an AC signal transmission circuit 109, and an amplifier 110.

The amplifier circuit 101 is connected to the output coil OC, amplifies a weak waveform signal output from the output coil OC, and obtains a conductor detection signal or a correction detection signal contained in the measurement target fluid L. It is supposed to get.

The bandpass filter 102 removes noise of a conductor detection signal or a correction detection signal as a waveform signal output from the amplifier circuit 101 within a predetermined range.

The sine wave oscillation circuit 103 is connected to the exciting coil EC, and obtains a sine wave for excitation from the output signal of the exciting coil EC.

The phase circuit 104 is adapted to shift the phase of the sine wave output from the sine wave oscillation circuit 103. The phase circuit 104 may shift the phase by 10 ° to 170 °, preferably 45 ° to 135 °, more preferably about 90 ° in the state when the conductor is not detected at the time of setting or adjustment. it can.

The edge trigger circuit 105 outputs a sine wave shifted in phase by the phase circuit 104 as a reference signal of a square wave having the same frequency as the detection signal of the conductor or the detection signal for correction.

The lock-in amplifier 106 determines the phase difference between the waveform signal (conductor detection signal or correction detection signal) from which noise has been removed by the bandpass filter 102 and the reference signal output from the edge trigger circuit 105. It is designed to detect while removing noise.

The low-pass filter 107 converts the output signal from the lock-in amplifier 106 into a DC voltage signal.

The amplifier 108 amplifies the DC voltage signal converted by the low-pass filter 107.

The AC signal transmission circuit 109 transmits only the fluctuation amount of the DC voltage signal due to the introduction / derivation of the measurement target fluid L output from the amplifier 108.

The amplifier 110 amplifies the fluctuation amount of the DC voltage signal transmitted by the AC signal transmission circuit 109 and outputs it as a measured value (concentration of the conductor) to the abnormality determining device 200 (see FIGS. 1 and 2). It has become.

As a result, when the measurement target fluid L is introduced into the measurement cylinder C by switching the switching valve V, the signal processor 100 acquires the detection signal of the conductor from the output coil OC and is used for the excitation. A reference signal of the same frequency is prepared from the coil EC, the phase difference between the conductor detection signal and the reference signal is detected by the lock-in amplifier 106, and the detected phase difference is used as an output value for the concentration of the conductor. When it is converted into a signal and the measurement target fluid L is derived from the measurement cylinder C by switching the switching valve V, the correction detection signal is acquired from the output coil OC and the same frequency is obtained from the exciting coil EC. A reference signal is prepared, the phase difference between the correction detection signal and the reference signal is detected by the lock-in amplifier 106, the detected phase difference is converted into a DC voltage signal as a reference output value for comparison, and the conductivity is described. It is configured to obtain the concentration of the conductor based on the difference between the output value for the concentration of the body and the output value for the comparison.

Next, the operation of the above reference example will be described.

When measuring the concentration of a conductor contained in the fluid L to be measured, such as lubricating oil for equipment such as an engine, the measurement is performed by switching the switching valve V as shown in FIG. 1 while the pump P is driven. Due to the pressure of the target fluid L, the measurement piston PS of the measurement cylinder C moves to the second cylinder chamber C2 side, and the measurement target fluid L is introduced into the first cylinder chamber C1. On the other hand, as shown in FIG. 2, when the switching valve V is switched, the measurement piston PS of the measurement cylinder C moves to the first cylinder chamber C1 side due to the pressure of the measurement target fluid L, and the measurement target fluid L moves to the first cylinder chamber C1. Derived from.

As shown in FIG. 2, in the state where the measurement target fluid L is derived from the first cylinder chamber C1, the correction detection signal is acquired by the output coil OC via the amplifier circuit 101 and the bandpass filter 102 ( (See waveform in FIG. 5A). At the same time, the square wave reference that causes a constant phase difference at the same frequency as the exciting voltage by shifting the phase at a predetermined angle via the sine wave oscillation circuit 103, the phase circuit 104, and the edge trigger circuit 105 by the exciting coil EC. The signal is prepared (see the square wave in FIG. 5B). The phase of the sine wave output from the sine wave oscillation circuit 103 is set to be shifted by 90 ° in the phase circuit 104. Then, the lock-in amplifier 106 detects the phase difference between the correction detection signal and the reference signal while removing noise. Here, the waveform shown in FIG. 5C shows a waveform in which the correction detection signal is inverted in correspondence with the reference signal. The noise-removed phase difference is converted into a smooth DC voltage signal as a reference output value for comparison in the low-pass filter 107 (see FIG. 5D), and is converted into an AC signal transmission circuit 109 via an amplifier 108. Is entered in.

On the other hand, as shown in FIG. 1, in the state where the measurement target fluid L is introduced into the first cylinder chamber C1, the measurement target fluid L is passed through the amplifier circuit 101 and the bandpass filter 102 by the output coil OC. The detection signal of the conductor contained in is acquired (see the waveform of FIG. 6A). At the same time, the square wave reference that causes a constant phase difference at the same frequency as the exciting voltage by shifting the phase at a predetermined angle via the sine wave oscillation circuit 103, the phase circuit 104, and the edge trigger circuit 105 by the exciting coil EC. The signal is prepared (see the square wave in FIG. 6B). The phase of the sine wave output from the sine wave oscillation circuit 103 is set to be shifted by 90 ° in the phase circuit 104, but the waveform of the detection signal of the conductor shown in FIG. 6A is conductive. Due to the influence of the body, the phase of the rectangular wave reference signal shown in FIG. 6B is shifted by Δf. Then, the lock-in amplifier 106 detects the phase difference between the detection signal of the conductor and the reference signal while removing noise. Here, the waveform shown in FIG. 6C shows a waveform in which the detection signal of the conductor is inverted in correspondence with the reference signal. The noise-removed phase difference is converted into a smooth DC voltage signal as an output value for the concentration of the conductor by the low-pass filter 107 (see FIG. 6D), and is converted into an AC signal transmission circuit via the amplifier 108. It is input to 109.

In the AC signal transmission circuit 109, only the fluctuation amount of the DC voltage signal due to the introduction / derivation of the measurement target fluid L output from the amplifier 108 is transmitted, and as shown in FIG. 6D, the concentration of the conductor is transmitted. The difference ΔV between the output value for comparison and the output value for comparison is obtained, the difference ΔV is amplified by the amplifier 110, and is output to the abnormality determination device 200 as a measured value (concentration of the conductor).

The measurement process in the state where the measurement target fluid L is introduced into the first cylinder chamber C1 and the measurement process in the state where the measurement target fluid L is derived from the first cylinder chamber C1 are alternately repeated, and the conductor. The moving average processing of the difference ΔV between the output value for the concentration and the output value for comparison is performed by the abnormality determining device 200, and the concentration of the conductor contained in the fluid L to be measured is obtained.

In the abnormality determining device 200, the concentration of the conductor is displayed, and the presence or absence of an abnormality in equipment such as an engine is determined according to the concentration of the conductor, and a warning is displayed when there is an abnormality.

Incidentally, the above operation is performed as shown in the flowchart shown in FIG. That is, at the start of concentration measurement of the conductor contained in the measurement target fluid L such as the lubricating oil of equipment such as an engine (see step S1), the position is in the state where the pump P is driven and turned on (see step S2). Whether or not the sensor 300 is turned on is detected (see step S3). The position sensor 300 is turned on when the position sensor 300 detects grooves g1 (or grooves g2) recessed on the outer circumferences of both ends of the measurement piston PS, and the measurement piston PS has a stroke end in reciprocating motion. It is when the position is reached. The signal processor 100 operates based on the signal output when the position sensor 300 is turned on, the phase difference is detected (see step S4), and the switching valve V is switched (step S5). reference). It is determined whether or not the set time has elapsed since the switching valve V was switched (see step S6), and after the set time has elapsed, the process returns to step S3 and whether or not the position sensor 300 is turned on. Is detected, and thereafter, the operations of steps S4, S5, and S6 are repeated.

As described above, according to the reference example , since the change in the phase difference generated between the voltage of the exciting coil EC and the voltage of the output coil OC is used, if it has conductivity, only the magnetic material is used. In addition, the concentration of the conductor can be measured even if it is a non-magnetic material. Further, the phase difference generated between the voltage of the exciting coil EC and the voltage of the output coil OC is used, and the measurement target fluid L including the conductor is brought close to the exciting coil EC and the output coil OC. At that time, since the change in the phase difference that occurs according to the concentration of the conductor is used, the concentration of the conductor can be measured with high accuracy. Further, in the reference example , since the phase difference generated between the voltage of the exciting coil EC and the voltage of the output coil OC and the voltage change of the output coil OC are used, the reactivity of the exciting coil EC depending on the presence or absence of the conductor is used. The concentration of the conductor is comprehensively grasped by various changes such as changes, changes in the reactorance of the output coil OC depending on the presence or absence of the conductor, changes in the eddy current generated in the fluid L to be measured, and changes in Joule loss due to the eddy current. Can be measured accurately.

Moreover, in the case of the reference example , the pump P and the switching valve V can be arranged at a position away from the measuring cylinder C, and the rotation as an external power source is performed as in the conventional technique disclosed in Patent Document 3. Since it is no longer necessary to equip the drive device (motor) with the conductor concentration measuring device in an integrated manner, the degree of freedom of arrangement is increased and the outer shape of the measuring cylinder C is not enlarged. It is effective when installing a body concentration measuring device.

In this way, the device can be miniaturized to improve the mountability.

7 and 8 are examples of the conductor concentration measuring device of the present invention, and in the drawings, the parts having the same reference numerals as those in FIGS. 1 and 2 represent the same objects. The basic configuration is the same as that of the reference examples shown in FIGS. 1 to 6, but the feature of the embodiment is that the first measurement target fluid is stored in the first cylinder chamber C1 as shown in FIGS. 7 and 8. The point is that L1 is introduced and derived, and the second measurement target fluid L2 is introduced and introduced into the second cylinder chamber C2 for measurement.

In the case of the embodiment , as shown in FIGS. 7 and 8, the first measurement target fluid L1 including the conductor is stored in the first tank T1, and the second measurement target fluid L2 different from the first measurement target fluid L1 It is stored in the second tank T2.

The first pipe PL1 is connected to the first tank T1, and a first pump P1 for pumping the first measurement target fluid L1 stored in the first tank T1 is provided in the middle of the first pipe PL1. There is. A second pipe PL2 is connected to the second tank T2, and a second pump P2 for pumping the second measurement target fluid L2 stored in the second tank T2 is provided in the middle of the second pipe PL2. There is.

The first pipe PL1 is connected to the first cylinder chamber C1 of the measuring cylinder C, and the second pipe PL2 is connected to the second cylinder chamber C2 of the measuring cylinder C.

A first switching valve V1 is provided in the middle of the first piping PL1, a second switching valve V2 is provided in the middle of the second piping PL2, and the first switching valve V1 and the second switching valve V2 are provided. By switching the above, the first measurement target fluid L1 pumped by the first pump P1 is introduced and led out to the first cylinder chamber C1, and the second measurement target fluid pumped by the second pump P2. L2 is led out and introduced into the second cylinder chamber C2 to reciprocate the measurement piston PS. In FIGS. 7 and 8, CV1 is the first check valve, and when the pressure in the first pipe PL1 on the discharge side of the first pump P1 rises above the set pressure, the first check valve CV1 Is opened to release pressure to the first tank T1. Further, in FIGS. 7 and 8, CV2 is a second check valve, and when the pressure in the second pipe PL2 on the discharge side of the second pump P2 rises above the set pressure, the second check valve CV2 Is opened to release pressure to the second tank T2.

The measuring cylinder C is provided with a first exciting coil EC1 so as to be disposed on the outer peripheral portion of the first cylinder chamber C1 and is arranged adjacent to the first exciting coil EC1. A one-output coil OC1 is provided, and a second excitation coil EC2 is provided so as to be disposed on the outer peripheral portion of the second cylinder chamber C2, and is arranged adjacent to the second excitation coil EC2. The second output coil OC2 is provided so as to be used. The first output coil OC1 generates an exciting voltage when an alternating current flows through the first exciting coil EC1, and the second output coil OC2 generates an alternating current when an alternating current flows through the second exciting coil EC2. It is designed to generate an exciting voltage.

Then, based on the signals from the first exciting coil EC1 and the first output coil OC1, the signal processor 100 obtains the concentration of the conductor contained in the first measurement target fluid L1 and also for the second excitation. Based on the signals from the coil EC2 and the second output coil OC2, the signal processor 100 obtains the concentration of the conductor contained in the second measurement target fluid L2.

Next, the operation of the above-described embodiment will be described.

The concentration of the conductor contained in the first measurement target fluid L1 such as the lubricating oil of equipment such as an engine and the concentration of the conductor contained in the second measurement target fluid L2 different from the first measurement target fluid L1. When measuring, when the first switching valve V1 and the second switching valve V2 are switched while the first pump P1 and the second pump P2 are driven, as shown in FIG. 7, the pressure of the first measurement target fluid L1 is measured. As a result, the measurement piston PS of the measurement cylinder C moves to the second cylinder chamber C2 side, the first measurement target fluid L1 is introduced into the first cylinder chamber C1, and the second measurement target fluid L2 is moved from the second cylinder chamber C2. Derived. On the other hand, as shown in FIG. 8, when the first switching valve V1 and the second switching valve V2 are switched, the measurement piston PS of the measurement cylinder C moves to the first cylinder chamber C1 side due to the pressure of the second measurement target fluid L2. The first measurement target fluid L1 is derived from the first cylinder chamber C1, and the second measurement target fluid L2 is introduced into the second cylinder chamber C2.

As a result, as in the case of the reference example , the measurement process in the state where the first measurement target fluid L1 is introduced into the first cylinder chamber C1 and the first measurement target fluid L1 are derived from the first cylinder chamber C1. While the measurement process in the state is alternately repeated, the measurement process in the state where the second measurement target fluid L2 is derived from the second cylinder chamber C2 and the second measurement target fluid L2 in the second cylinder chamber C2. The measurement process in the introduced state is repeated alternately, and the concentration of the conductor contained in the first measurement target fluid L1 and the concentration of the conductor contained in the second measurement target fluid L2 are measured with high accuracy. Can be done.

Further, in the case of the embodiment , the first pump P1 and the second pump P2, the first switching valve V1 and the second switching valve V2 can be arranged at a position away from the measuring cylinder C, and are disclosed in Patent Document 3. Since it is no longer necessary to equip the conductor concentration measuring device with a rotary driving device (motor) as an external power source as in the conventional technique, the degree of freedom of arrangement is increased and the measuring cylinder C is increased. The outer shape of the cylinder does not become large, which is particularly effective when a conductor concentration measuring device is retrofitted to existing equipment.

In this way, in the embodiment, as in the case of the reference example , in addition to being able to reduce the size of the device and improve the mountability, the first measurement target fluid L1 and the second measurement target fluid L2 are included in the different fluids. There is an advantage that the concentration of the conductor can be measured at the same time.

Then, in the case of the reference example , the signal processor 100 acquires the detection signal of the conductor from the output coil OC when the measurement target fluid L is introduced into the measurement cylinder C by switching the switching valve V. , A reference signal of the same frequency is prepared from the exciting coil EC, the phase difference between the conductor detection signal and the reference signal is detected by the lock-in amplifier 106, and the detected phase difference is output for the concentration of the conductor. Convert to a DC voltage signal as a value. When the measurement target fluid L is derived from the measurement cylinder C by switching the switching valve V, the signal processor 100 acquires a correction detection signal from the output coil OC and from the excitation coil EC. A reference signal having the same frequency is prepared, the phase difference between the correction detection signal and the reference signal is detected by the lock-in amplifier 106, and the detected phase difference is converted into a DC voltage signal as a reference output value for comparison. .. The signal processor 100 is configured to obtain the concentration of the conductor based on the difference between the output value for the concentration of the conductor and the output value for comparison. Such a configuration is preferable in order to accurately measure the concentration of the conductor contained in the fluid L to be measured.

Further, in the case of the reference example , the position sensor 300 that detects that the measurement piston PS has reached the stroke end position in the reciprocating motion and outputs a signal is provided, and the signal is based on the signal output from the position sensor 300. It is configured to operate the processor 100 and the switching valve V (in the case of the embodiment , the first switching valve V1 and the second switching valve V2). With such a configuration, the reciprocating movement of the measurement piston PS can be smoothly controlled, which is preferable.

Furthermore, the pipe PL of the reference example is connected to the first pipe PL1 connected to the first tank T1 in which the first measurement target fluid L1 including the conductor is stored, as in the examples shown in FIGS. 7 and 8. , The second pipe PL2 connected to the second tank T2 in which the second measurement target fluid L2 including the conductor is stored can be provided. The pump P is provided in the middle of the first pipe PL1 and is provided in the middle of the second pipe PL2 and is provided in the middle of the first pump P1 for pumping the first measurement target fluid L1 stored in the first tank T1. A second pump P2 for pumping the second measurement target fluid L2 stored in the second tank T2 can be provided. The switching valve V introduces and derives the first measurement target fluid L1 provided in the middle of the first pipe PL1 and pumped by the first pump P1 into the first cylinder chamber C1, and the measurement piston PS. A first switching valve V1 for reciprocating the fluid and a second measurement target fluid L2 provided in the middle of the second pipe PL2 and pumped by the second pump P2 are led out and introduced into the second cylinder chamber C2. A second switching valve V2 for reciprocating the measuring piston PS can be provided. The exciting coil EC is arranged on the outer peripheral portion of the first exciting coil EC1 provided in the measuring cylinder C and the outer peripheral portion of the second cylinder chamber C2 so as to be disposed on the outer peripheral portion of the first cylinder chamber C1. A second exciting coil EC2 provided in the measuring cylinder C can be provided. The output coil OC is provided in the measuring cylinder C so as to be arranged adjacent to the first exciting coil EC1 on the outer peripheral portion of the first cylinder chamber C1 and is AC to the first exciting coil EC1. The measuring cylinder C is provided with a first output coil OC1 that generates an exciting voltage when a current flows, and an outer peripheral portion of the second cylinder chamber C2 so as to be arranged adjacent to the second exciting coil EC2. Further, a second output coil OC2 that generates an exciting voltage when an alternating current flows through the second exciting coil EC2 can be provided. The signal processor 100 is configured to obtain the concentration of the conductor contained in the first measurement target fluid L1 and the concentration of the conductor contained in the second measurement target fluid L2. With this configuration, the concentration of the conductor contained in each of the different fluids, the first measurement target fluid L1 and the second measurement target fluid L2, can be simultaneously measured by one measurement cylinder C, and the efficiency can be improved.

The conductor concentration measuring device of the present invention is not limited to the above-described embodiment, and a special fluid to be measured such as lubricating oil can be obtained from a line where hydraulic pressure is already established, such as an engine oil gallery. It is also possible to sample via piping without using a pump, etc., and the fluid to be measured is not limited to lubricating oil, but other oils, aqueous solutions, water, etc. Of course, various changes can be made without departing from the gist of the invention.

100 Signal processor 106 Lock-in pump 300 Position sensor C Measuring cylinder C1 First cylinder chamber C2 Second cylinder chamber PS Measuring piston EC Excitation coil EC1 First excitation coil EC2 Second excitation coil OC Output coil OC1 First Output coil OC2 Second output coil L Measurement target fluid L1 First measurement target fluid L2 Second measurement target fluid P Pump P1 First pump P2 Second pump PL Piston PL1 First piping PL2 Second piping T Tank T1 First Tank T2 Second tank V Switching valve V1 First switching valve V2 Second switching valve

Claims (2)

Piping through which the fluid to be measured including the conductor is distributed,
A measuring cylinder having a first cylinder chamber and a second cylinder chamber partitioned by a measuring piston that is slidably inserted and the pipe is connected to the first cylinder chamber and the second cylinder chamber.
A switching valve that alternately introduces and derives the fluid to be measured from the pipe into the first cylinder chamber and the second cylinder chamber to reciprocate the measurement piston.
An exciting coil provided in the measuring cylinder so as to be arranged on the outer peripheral portion of at least one of the first cylinder chamber and the second cylinder chamber.
The measuring cylinder is provided on the outer peripheral portion of at least one of the first cylinder chamber and the second cylinder chamber so as to be adjacent to the exciting coil, and when an alternating current flows through the exciting coil, an exciting voltage is applied. Output coil that generates
It is provided with a signal processor for obtaining the concentration of the conductor based on the signal from the exciting coil and the output coil.
The signal processor
When the measurement target fluid is introduced into the measurement cylinder by switching the switching valve, the conductor detection signal is acquired from the output coil, and the reference signal of the same frequency is prepared from the exciting coil to prepare the conductor. The phase difference between the detection signal and the reference signal is detected by the lock-in amplifier, and the detected phase difference is converted into a DC voltage signal as an output value for the concentration of the conductor.
When the measurement target fluid is derived from the measurement cylinder by switching the switching valve, a correction detection signal is acquired from the output coil, and a reference signal having the same frequency is prepared from the exciting coil to detect the correction. The phase difference between the signal and the reference signal is detected by the lock-in amplifier, and the detected phase difference is converted into a DC voltage signal as a reference output value for comparison.
It is configured to obtain the concentration of the conductor based on the difference between the output value for the concentration of the conductor and the output value for comparison .
The pipe is connected to a tank in which a fluid to be measured including a conductor is stored.
A pump provided in the middle of the pipe and pumping the fluid to be measured stored in the tank is provided.
The pipe is connected to a first pipe in which a first measurement target fluid containing a conductor is stored and a second tank in which a second measurement target fluid including a conductor is stored. Equipped with two pipes
The pumps are a first pump provided in the middle of the first pipe and pumping a first measurement target fluid stored in the first tank, and a first pump provided in the middle of the second pipe and stored in the second tank. Equipped with a second pump that pumps the fluid to be measured
The switching valve is a first that is provided in the middle of the first piping and introduces and draws out the first measurement target fluid that is pumped by the first pump into the first cylinder chamber to reciprocate the measurement piston. The switching valve and the second switching target fluid provided in the middle of the second piping and pumped by the second pump are led out and introduced into the second cylinder chamber to reciprocate the measuring piston. Equipped with a valve
The exciting coil includes a first exciting coil provided in the measuring cylinder so as to be arranged on the outer peripheral portion of the first cylinder chamber, and the measuring cylinder so as to be arranged on the outer peripheral portion of the second cylinder chamber. Equipped with a second excitation coil provided in
The output coil is provided in the measuring cylinder so as to be arranged adjacent to the first exciting coil on the outer peripheral portion of the first cylinder chamber, and is excited when an alternating current flows through the first exciting coil. The first output coil that generates a voltage and the measurement cylinder are provided on the outer peripheral portion of the second cylinder chamber so as to be adjacent to the second excitation coil, and the second excitation coil is AC. Equipped with a second output coil that generates an exciting voltage when a current flows,
The signal processor is a conductor concentration measuring device characterized in that the concentration of a conductor contained in the first measurement target fluid and the concentration of a conductor contained in the second measurement target fluid are obtained. .. A position sensor that detects that the measuring piston has reached the stroke end position in the reciprocating motion and outputs a signal is provided.
Conductors concentration measuring device according to claim 1 configured to actuate the signal processor and the switching valve on the basis of a signal output from the position sensor.

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