JPH0672495A - Sampler - Google Patents

Abstract

PURPOSE:To provide a sampler which can accurately take a certain quantity of sample by simple sampling work, in a sampling device by which a certain volume of liquid can be taken from a sampling pipe branched from a main pipe. CONSTITUTION:A flow meter 8 is equipped in the upper stream side than a sampling valve 4 in a sampling pipe 2 branched from a main pipe line 1. A flow meter 9 is arranged in the downstream side of the sampling value 4. In a controller 12, respective flow rate detection signals from both flowrate meters 8, 9 in the upstream and the downstream are compared to detect abnormal state of the device. The sampling valve 4 is changed over in accordance with the detected signals from the flow meter 8 at the upstream side to take a specified volume of liquid into a sampling vessel 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sampling device, and more particularly to a sampling device for sampling a fixed amount of liquid from a sampling pipe provided branching from a main pipe.

[0002]

2. Description of the Related Art For example, in an essential oil facility for refining oil liquid such as petroleum, a large amount of refined oil liquid is fed to a tanker or a storage tank via a main pipe line. In such a facility that handles a large amount of oil liquid, it is important to accurately control not only the amount of oil liquid but also the quality.

Therefore, a sampling device for sampling a fixed amount of oil liquid is provided in the middle of the feeding pipe, and the oil liquid sampled by this device is analyzed to analyze the specific gravity, sulfur content, salt content, water content, etc. Each item is checked.

Examples of this type of collecting device include a pump which is provided in a collecting pipe which is branched and connected to the main pipe and which sucks oil liquid from the main pipe, and extracts the oil liquid sucked by the pump into a collecting container. It is configured to have a sampling valve.
The collection container is, for example, a transparent container, and has a scale on its outer circumference.

In the above sampling apparatus, an operator manually switches the sampling valve at the time of sampling to visually check the rise of the liquid level in the sampling container on the scale of the container, and switches the sampling valve to the closed state when a predetermined amount is sampled.

Alternatively, when the operator operates the sampling valve from a location remote from the sampling site by remote control, the control device opens the sampling valve to the sampling container side for a predetermined time corresponding to a predetermined sampling amount. , A certain amount of oil liquid was collected.

[0007]

However, in the above-mentioned conventional sampling device, when the operator manually collects the sample, the amount of the oil liquid is visually monitored and the valve operation is performed, so that the sampling amount easily varies. , It was difficult to collect a certain amount accurately. Moreover, if the valve operation is delayed and the oil liquid overflows from the sampling container, sampling must be restarted,
The collection work will be done twice, and extra labor will be required.

Further, when the sampling valve is operated by remote control for sampling for a certain period of time, if the flow rate in the sampling tube changes or an abnormality occurs in the sampling tube or sampling valve, the oil liquid leaks. However, the amount of oil liquid collected could not be controlled at a constant level, and the oil liquid could overflow from the collection container.

In view of the above points, it is an object of the present invention to provide a sampling device which makes it possible to accurately collect a sampling amount by a simple sampling operation.

[0010]

The above-mentioned problems can be solved by the following constitution.

That is, in a sampling device for collecting a certain amount of liquid in a sampling container by providing a pump for sucking the liquid and a sampling valve in a sampling pipe branching from a main pipe through which the liquid is fed, and switching operation of the sampling valve. A first flow rate detecting means disposed in a sampling pipe upstream of the sampling valve and generating a first flow rate detection signal according to a flow rate of the liquid flowing into the sampling valve; and a sampling pipe downstream of the sampling valve. Second flow rate detection means for generating a second flow rate detection signal according to the flow rate of the liquid flowing through the collection pipe line downstream of the collection valve disposed in the channel, and the collection valve based on the first flow rate detection signal And a valve control means for controlling the amount of liquid collected in the sampling container to a predetermined amount, and an abnormality determination means for comparing the first flow rate detection signal and the second flow rate detection signal to detect the presence or absence of abnormality. It is solved by having and.

[0012]

According to the present invention having the above-mentioned structure, in accordance with the switching operation of the sampling valve, when the oil liquid is sampled from the sampling valve into the sampling container, the sampling amount is obtained by the first flow rate detection signal, and the sampling is performed. When the device is normal when the oil liquid is flowing through the pipeline, the first flow rate detection signal of the upstream first flow meter and the second flow rate detection signal of the downstream second flow meter are Act to be equal.

[0013]

FIG. 1 is a block diagram of an embodiment of the present invention.

In the figure, the sampling device is a relatively large-diameter main pipe line 1 through which the oil liquid is fed in order to load the oil liquid refined at a refinery into a tanker or tank truck (both not shown). It is installed in.

Reference numeral 2 is a sampling conduit bypassed from the main conduit 1, and the upstream end 2a of the sampling conduit 1a projects into the main conduit 1.
And the downstream end 2b is connected to the nozzle 1b inserted in the main pipe line 1 downstream of the sampling port 1a. The collection port 1a has a tip opening that is obliquely cut toward the upstream side, and has a shape that facilitates collection of the fluid flowing in the main pipeline 1.

A pump 3 for sucking the oil liquid flowing through the main pipe 1, a sampling valve 4 for collecting a predetermined amount of the oil liquid in a sampling container 7, and a pump 3 are pumped to the sampling pipe 2. Upstream flow meter (first flow rate detection means) 8 for measuring the flow rate of the oil liquid flowing through the sampling pipe 2 upstream of the sampling valve 4 and the oil flowing through the sampling pipe 2 downstream of the sampling valve 4. A downstream flow meter (second flow rate detecting means) 9 that measures the flow rate of the liquid, and a check valve 6 that prevents the reverse flow of the oil liquid from the nozzle 1b to the sampling conduit 2 are provided. A metering valve 11 is arranged between the pump 3 and the upstream flow meter 8.

The pump 3 is constantly driven when the oil liquid is fed in order to prevent old oil liquid from accumulating in the sampling pipe line 2. Therefore, the pump 3 is driven by the activation signal from the control device 12 which is the valve control means and the abnormality determination means even when the oil liquid is sampled from the sampling valve 4, and the upstream end of the sampling pipe line 2 is driven. The oil liquid sucked from the portion 2a is pressure-fed to the downstream end portion 2b.

The metering valve 11 is driven by an actuator 11a which operates under the control of the controller 12. Normally, the inflow port 11b and the outflow port 11c of the metering valve 11 are communicated with each other. However, as described later, when an abnormality of the sampling unit 4 is detected, the inflow port 11b and the outflow port 11c are brought into a non-communication state according to the valve closing signal from the control device 12a.
As a result, the flow of the oil liquid in the sampling conduit 2 is stopped.

As the upstream flow meter 8, for example, a positive displacement type flow meter is used, and at the time of measuring the flow rate, a flow rate pulse (first flow rate detection signal) having a frequency proportional to the flow rate in the sampling pipe 2 upstream of the sampling valve 4 is measured. ) Is provided for the oscillator 8a.
Similarly, a downstream type flow meter 9 is also a positive displacement type flow meter, and when measuring the flow rate, a flow rate pulse (second flow rate detection signal) having a frequency proportional to the flow rate flowing in the sampling pipeline 2 on the downstream side of the sampling valve 4 is measured. ) Is provided for the oscillator 9a.

The sampling valve 4 is an electromagnetically driven three-way solenoid valve, and is connected to an actuator section 4a driven in response to a switching signal from the control device 12 and an upstream flow meter 8 side upstream of the sampling conduit 2. It has an inflow port 4b, an outflow port 4d connected to the downstream flowmeter 9 side downstream of the sampling pipe line 2, and an extraction port 4c provided so as to be branched from the sampling pipe line 2.

It should be noted that the sampling valve 4 is usually an inflow port 4b and an outflow port 4
The oil liquid pumped from the pump 3 at a pressure higher than that of the main pipeline 1 is delivered to the main pipeline 1 via the upstream flow meter 8 and the check valve 6. Therefore, the oil liquid does not always flow and stay in the sampling conduit 2 at a constant pressure. However, when the switching signal is supplied to the actuator portion 4a, the sampling valve 4 is switched so as to connect the inflow port 4b and the extraction port 4d, and the oil liquid is sampled in the sampling container 7.

At the end of sampling, the sampling valve 4 is actuated by the switching signal from the controller 12 to the actuator section 4a.
Is operated, the inlet 4b and the outlet 4d are switched to communicate with each other.

Reference numeral 13 is a start button for starting sampling, 14 is a quantitative setting switch for arbitrarily setting a sampling flow rate (sampling amount), and 15 is an alarm device for issuing an alarm when the sampling device has an abnormality. It is connected to the device 12.

The control unit 12 is composed of a microcomputer, and as is well known, a central processing circuit (CP).
U), read only memory (ROM), random access memory (RAM), interface (I / O), data bus and the like.

Reference numeral 7 denotes a sampling container, which is formed of, for example, transparent glass or acrylic resin in a cup shape, and the sampling container 7 placed on a mounting table (not shown) has an upper opening through the extraction port 4c of the sampling valve 4. The lower end of the extending extraction tube 16 is inserted.

Next, the operation of the sampling device will be described with reference to FIG.
It will be described together with the flowchart of.

First, in step S1 (hereinafter, steps will be omitted), it is determined whether or not the start button 13 is pressed to determine whether or not to collect the oil liquid. If the normal sampling is not performed, the start button 13 is not pressed. In this case, the oil liquid sampling process is not performed and the process proceeds to S2.

Further, normally, the flow rate pulse from the upstream side flow meter 8 and the downstream side flow meter 9 is constantly sent to the control device 12, and the upstream side flow meter 8 and the downstream side flow meter 9 are sent in S2.
It is determined whether the measured values of are equal. Hereinafter, the measurement value of the upstream flow meter 8 is F8, and the measurement value of the downstream flow meter 9 is F9. That is, the values obtained by integrating the above-described flow rate pulse by the control device 12 are defined as F8 and F9.

If F8 = F9, the amount of oil liquid flowing from the upstream flow meter 8 into the inflow port 4b of the sampling valve 4 and the sampling valve 4
Since the amount of the oil liquid reaching the inflow port 9b of the downstream flow meter 9 from the outflow port 4d is the same and a constant flow amount is flowing in the sampling pipe line 2 without leakage of the oil liquid, the processing is ended.

On the other hand, if F8 ≠ F9, it means that some abnormality has occurred in the sampling device. Therefore, after executing the process of S3 and issuing a leak alarm by the alarm device 13, S4 is executed,
The inflow port 11b and the outflow port 11c are brought into a non-communication state by the valve closing signal from the control device 12 to close the metering valve 11 and stop the flow of the oil liquid in the sampling pipe line 2. The abnormality at this time is
In the case of normal F8> F9, it is conceivable that the oil liquid is leaking to the extraction port 4c due to an abnormality of the collection valve 4. On the other hand, if F9> F8, it is considered that one of the flow meters is abnormal.

By the way, in S1, the start button 13
When is pressed and it is determined to collect the oil liquid, S5
Perform the subsequent sampling process.

That is, as described above, the actuator 4a
Is operated to switch the sampling valve 4 so that the inflow port 4b and the extraction port 4c communicate with each other (S5).

Subsequently, in S6, it is determined whether or not the measured value F9 of the downstream flow meter 9 has become zero. Since the sampling valve 4 is switched to deliver the oil liquid to the extraction port 4c in S5, the sampling valve 4 is switched when the value of F9 is not 0.
Because there is something wrong with. In this case, since it is impossible to collect an accurate amount of oil liquid based on the value of F8, the alarm device 13 issues an uncollectable alarm (S7).

When it is determined in S6 that the value of F9 has become 0, all the oil liquid that has passed through the upstream flow meter 8 has been sent to the extraction port 4c, and the measured value F8 of the upstream flow meter 8 has been reached. Based on the above, it is possible to collect an accurate amount of oil liquid in the collection container 7. Therefore, the controller 12 resets the measured value F8 once in S8, and then starts measuring the sampled amount based on the value of F8 obtained by integrating the flow rate pulse from the oscillator 8a.

That is, in S9, the predetermined sampling amount S (for example, 2 liters) input by the quantitative setting switch 14 in advance is compared with the measured value M8 of the upstream flow meter 8 which is increasing every moment. When S ≠ M8, this comparison process is repeatedly executed until the measured value M8 becomes equal to the predetermined sampling amount S.

When S = M8, a predetermined amount of oil liquid is collected in the sampling container 7, so the actuator 4a is operated to switch the sampling valve 4, and the inlet 4b and the outlet 4d are connected (S10). Finish the collection.

At this time, if the operation of the sampling valve 4 is normal,
The oil liquid flows to the downstream flow meter 9 and the flow rates to the upstream flow meter 8 and the downstream flow meter 9 are equal, and F8 = F9 corresponding to the flow rate based on the pressure of the pump 3.
Therefore, in S11, it is determined whether or not F9 = 0, and F9
If = 0, it is considered that the oil liquid is not flowing to the downstream flow meter 9 and the oil liquid is leaking from the extraction port 4c due to the operation abnormality of the sampling valve 4.

Also, when F9 ≠ 0 in S11 and F8> F9 in the subsequent S12, it is considered that the oil liquid is leaking from the extraction port 4c in the same manner, and the collection container 7
The oil may overflow from it. Therefore, in either case, S14 is executed after the overflow alarm is issued by the alarm device 15 in S13, and the inflow port 11b and the outflow port 11c of the metering valve 11 are executed by the valve closing signal from the control device 12.
And are brought into the non-communication state to stop the flow of the oil liquid in the sampling pipe line 2.

As described above, according to the present embodiment, the controller 12 performs a predetermined comparison process based on the measured value of the upstream flow meter 8 and the measured value of the downstream flow meter 9, thereby ensuring that the device operates normally. If such an operation is maintained, it is possible to collect a predetermined amount of oil liquid even if the flow rate in the sampling conduit 2 changes.

Further, as described above, it is possible to know the abnormality of the sampling valve 4 or the like of the device according to the comparison result of the measured value numbers output from the upstream side flow meter 8 and the downstream side flow meter 9, and to check,
It becomes possible to quickly carry out work such as repairs, and shorten the recovery time. Further, since the overflow from the collection container 7 can be detected in advance and the quantitative valve 11 can be closed to prevent the overflow, the safety in collecting the oil liquid can be further improved.

Although the oil liquid is collected in the above embodiment, the present invention is not limited to this, and it is needless to say that the present invention can be applied to the collection of liquid chemicals other than the oil liquid or foods.

Further, the flow meter is not limited to the positive displacement type flow meter, and it goes without saying that other types of flow meters such as a vortex flow meter and a Coriolis mass flow meter may be used. As the second flow rate detecting means, any means capable of detecting the flow rate may be used, and for example, a flow switch may be used instead of the flow meter.

[0043]

As described above, according to the present invention, since the sampling valve is controlled to be switched based on the first flow rate detection signal of the first flow rate detecting means, the sampling container can be operated regardless of the flow rate in the sampling conduit. Since a predetermined amount of oil liquid can be accurately sampled, and the first flow rate detecting means and the second flow rate detecting means are provided on the upstream side and the downstream side of the sampling valve, it is possible to respond to the switching operation of the sampling valve. By comparing the first flow rate detection signal and the second flow rate detection signal of each flow meter, abnormal operation of the sampling valve can be detected, and work such as inspection and repair can be performed quickly. It has features such as shorter recovery time.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a flowchart of an embodiment of the present invention.

[Explanation of symbols]

 1 Main Pipeline 2 Sampling Pipeline 3 Pump 4 Sampling Valve 7 Sampling Container 8 Flowmeter (First Flow Rate Detection Means) 9 Flowmeter (Second Flowrate Detection Means) 12 Control Device (Valve Control Means, Abnormality Judgment Means)

Claims (1)

[Claims] 1. A pump and a sampling valve for sucking the liquid are provided in a sampling conduit branched from a main conduit for feeding the liquid, and a certain amount of the liquid is sampled in a sampling container by a switching operation of the sampling valve. In the sampling device, a first flow rate detection unit that is disposed in a sampling pipeline upstream of the sampling valve and that generates a first flow rate detection signal according to a flow rate of the liquid flowing into the sampling valve; Second flow rate detection means disposed in a sampling pipe line downstream of the valve for generating a second flow rate detection signal according to a flow rate of the liquid flowing in the sampling pipe line downstream of the sampling valve; Valve control means for switching and controlling the sampling valve based on a first flow rate detection signal to set a predetermined amount of the liquid to be collected into the sampling container; the first flow rate detection signal and the second flow rate. An abnormality determination means for comparing the detection signal to detect the presence or absence of abnormality Collecting apparatus characterized by Bei was.