JPH06755Y2 - Sampling device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sampling device, and more particularly to a sampling device configured to extract a required amount of fluid flowing in a pipe line.

2. Description of the Related Art For example, in an oil facility or the like, when the oil carried by a tanker is transferred to a tank on the ground via a pipeline, a part of the oil is extracted and the composition or type of the oil is inspected. There is. Therefore, the pipeline is provided with a sampling device for extracting an appropriate amount of the transferred fluid.

Examples of this type of sampling device include the following. As a pump, branching from the pipeline and returning to the pipeline, a pump is installed in the extraction line, check valves, three-way valves, etc. are installed on the upstream and downstream sides of the pump, and the pipeline passes through the extraction line by switching the three-way valve. There is a sampling device configured to extract a part of the fluid to be discharged. or,
There is a sampling device disclosed in Japanese Utility Model Laid-Open No. 61-114345.

However, in the above sampling device, the number of parts such as the extraction line, the pump, the check valve, and the three-way valve is large, so that the size becomes large and the amount of fluid remaining in the device increases. There is a problem such as. In addition, in order to extract the fluid that is currently being transferred, it is necessary to discharge all the fluid that remains in the device, and there is the problem that the operation at the time of sampling is troublesome.

Further, in the above-mentioned sampling device, when the pressure of the sample in the sample sampling tube is high, the suction check valve and the discharge check valve are opened due to the pressure of the sample, so that the sampling check valve is not operated at the time of sampling. There is a problem that the sample flows into the storage container. Further, in this device, the piston of the manual pump is configured to be pulled out from the cylinder, and when the suction check valve is opened by pressure, the piston of the manual pump receives the pressure of the sample and falls off from the cylinder. is there.

Then, this invention aims at providing the sampling device which solved the said problem.

Means for Solving the Problems The present invention is directed to an inflow path, one end of which communicates with a conduit for feeding a fluid, into which a fluid flowing in the conduit flows, and an inflow path provided in the inflow path. A check valve that allows a fluid flowing through the flow passage to flow from one end to the other end, and a piston provided inside that communicates with the other end of the flow passage and is slidably displaced in one direction by the piston. A collection chamber into which the fluid flows through an inflow passage, an outflow passage which is provided in communication with the collection chamber, and which causes the fluid to flow out from the collection chamber by sliding displacement of the piston in the other direction, and the piston. A piston drive means for sliding displacement in one direction or the other, a pressure guiding path having one end communicating with the pipe, and a pressure of fluid introduced through the pressure guiding path, which is provided in the outflow path. In the direction of blocking the outflow passage by the back pressure. And a spring means for urging the valve body in a direction to close the outflow passage.

The structure of the operating device can be made more compact and less fluid remains in the device. Even if the piston receives the fluid pressure and slides, it receives the pressure of the fluid introduced from the pressure guiding passage as back pressure in the outflow passage, and urges the back passage to close the outflow passage. Since the valve body is provided,
It is possible to reliably prevent the fluid from leaking to the outside through the inflow passage, the collection chamber, and the outflow passage, and it is possible to stably and accurately collect the high-pressure fluid.

Embodiment An embodiment of the sampling device according to the present invention is shown in the drawing. In the figure, a sampling device 2 is directly attached to a pipeline 1. Inside the sampling device 2, an inflow chamber (sampling chamber) 3 for extracting the fluid passing through the pipeline 1 a of the pipeline 1 is provided. Further, the inflow chamber 3 is connected to the pipe line 1 a via a check valve 4. The check valve 4 is usually configured such that a spherical valve body 4a is pressed by the spring force of a spring 4b,
The inflow port (inflow path) 2a that opens to the pipeline 1a is closed.

Reference numeral 5 denotes a piston, which is provided on both ends of the rod 5a with piston portions 5b,
5c is integrally provided. One piston portion 5b is fitted into the inflow chamber 3, and a seal member 5d that comes into contact with the valve seat 3a of the inflow chamber 3 is provided at the end portion thereof.

The other piston portion 5c is fitted in the actuator (piston driving means) 6 so that the inside of the actuator 6 is in the upper chamber 6
a and the lower chamber 6b. The upper chamber 6a is connected to a port 8a of a 4-way switching valve 8 via an air pipe 7a, and the lower chamber 6b is connected to a 4-way switching valve 8 via an air pipe 7b.
Connected to port 8b.

The port 8c of the 4-way switching valve 8 is connected via an air pipe 7c to a cylinder 9 containing a high-pressure gas source, and the port 8d is open to the atmosphere. Normally ports 8a and 8
c communicates with each other, and the ports 8b and 8d communicate with each other. Therefore, high-pressure gas is supplied from the cylinder 9 to the upper chamber 6a of the actuator 6, and the piston 5 is displaced in the A direction to close the valve seat 3a of the inflow chamber 3.

Therefore, even if the fluid pressure of the pipeline 1 acts on the piston 5, the piston 5 does not slide by itself, that is, even when the high-pressure fluid is being fed in the pipeline 1, the fluid is introduced into the inflow chamber 3. Are prevented from flowing in.

An outflow port 3b is provided on the side of the inflow chamber 3, and the outflow port 3b is normally closed by a valve body 10a of the back pressure valve 10. The valve body 10a of the back pressure valve 10 is a spring (spring means) 1
It is pressed by the spring force of 0b, and pressure guiding hole (pressure guiding path)
The fluid pressure of the conduit 1 a introduced via 11 is pressed and urged in the valve closing direction. Further, the outflow passage 12 communicating with the outflow port 3b is open to the atmosphere via a pipe 13, and the tip of the pipe 13 is opened inside the sampling container 14.

Here, the operation of the sampling device 2 having the above configuration will be described.

For example, when the tanker arrives at the oil facility, the oil transported by the tanker is transferred to the tank on the ground via the pipeline 1. Therefore, in order to investigate the components of the oil transported by the tanker, the oil passing through the pipe line 1 is extracted by the sampling device 2.

First, the four-way switching valve 8 is switched to operate the ports 8b and 8c.
And the ports 8a and 8d are communicated with each other.

Therefore, the high pressure gas from the cylinder 9 is supplied to the lower chamber 6b of the actuator 6, and the gas in the upper chamber 6a is exhausted from the port 8d of the four-way switching valve 8. The piston 5 is driven to the position shown by the alternate long and short dash line, and the piston portion 5b is separated from the valve seat 3a.

The outer circumference of the piston portion 5b is slightly smaller than the inner wall of the inflow chamber 3. Therefore, the check valve 4 is opened with the displacement of the piston portion 5b in the B direction, and the fluid in the pipeline 1 flows into the inflow chamber 3 through the inflow port 2a and the valve seat 3a.
By merely displacing the piston 5 as described above, the amount required for the inspection can be made to flow into the inflow chamber 3.

The back pressure valve 10 is closed when the piston portion 5b is displaced in the inflow direction B.

Next, the four-way switching valve 8 is switched to connect the ports 8a and 8c and the ports 8b and 8d. Therefore, the high-pressure gas in the cylinder 9 is supplied to the upper chamber 6a of the actuator 6, the gas in the lower chamber 6b is exhausted from the port 8d, and the piston 5 is displaced in the direction A, which is the outflow direction.

Therefore, the check valve 4 is closed and the back pressure valve 10 is opened as the piston portion 5b is displaced again to the position shown by the solid line. That is, the gas that has flowed into the inflow chamber 3 passes through the outflow port 3b, the outflow passage 12, and the pipe 13 and the collection container 1
Spill into 4

In this way, an appropriate amount of fluid flowing in the conduit 1a can be directly extracted, and an extremely small amount of fluid remains in the sampling device 2.

Furthermore, in the sampling device 2 of the present embodiment, since the back pressure valve 10 is supplied with the pressure of the fluid passing through the inside of the pipeline 1a from the pressure guiding hole 11 as the back pressure, the pipeline 1 of the pipeline 1 is
Even if the pressure of the fluid passing through the inside of a increases, the back pressure valve 10 will not open due to this pressure. Therefore,
Even if the pressure of the fluid passing through the inside of the pipe 1a is high, this fluid does not leak to the outside through the inflow port 2a, the inflow chamber 3, and the outflow passage 12.

Effect of the Invention As described above, the sampling device according to the present invention does not need to be provided with a plurality of check valves, pumps, etc. in the extraction line as in the conventional case, and therefore the fluid flowing in the pipeline can be extracted with a simple structure. It is possible to produce at low cost because it is possible to make a compact structure. Furthermore, by extracting the fluid directly from the pipeline, it is possible to extract only the required amount, and the amount of residue in the device can be extremely small. Also, since it is sufficient to drive the piston by the piston drive means, the operation at the time of collection is also possible. It's easy.

In addition, since a back pressure valve that uses the pressure of the fluid in the pipeline as a back pressure is used for the valve provided in the outflow passage, the fluid in the above-mentioned pipeline can be used for the inflow passage, the collection chamber, and the outflow passage. It has the feature that it does not leak to the outside without permission.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of a sampling device according to the present invention. 1 ... Pipeline (pipe line), 2 ... Sampling device, 3 ... Inflow chamber (sampling chamber), 4 ... Check valve, 5 ... Piston, 6 ... Actuator (piston driving means), 10 ... Back pressure valve.

Claims (1)

[Scope of utility model registration request] 1. An inflow passage, one end of which communicates with a pipe for feeding a fluid, into which a fluid flowing in the pipe flows, and a fluid which is provided in the inflow passage and flows in the pipe. A check valve that allows the fluid to flow from one end to the other end of the fluid, and the fluid is allowed to flow through the inflow passage by a sliding displacement in one direction of a piston provided inside the piston, which communicates with the other end of the inflow passage. And a discharge chamber that communicates with the sampling chamber and that allows the fluid to flow out of the sampling chamber by the sliding displacement of the piston in the other direction. The piston slides in one direction or the other direction. A piston drive means for dynamic displacement, a pressure guide passage having one end communicating with the conduit, and a pressure guideway provided in the outflow passage for receiving the pressure of the fluid introduced from the pressure guide passage as a back pressure. A valve element biased in a direction to close the outflow passage, A sampling device comprising: spring means for urging the valve body in a direction of closing the outlet.