KR0158093B1 - Automatic liquid sampler - Google Patents

Abstract

The present invention relates to an automatic liquid sampling device, and more specifically, to an automatic liquid sample using an air-ejector capable of remotely sampling a highly toxic or radioactive solution-like substance from a storage container or a process pipe. It can be operated remotely in a shielded or enclosed space by collecting the sample, and it can collect a certain amount of sample easily and quickly periodically, guarantee the durability and simplify the operation operation. A float valve is installed in front of the suction pipe of the air-ejector connected to the reflux pipe to block the inflow, and the suction pipe of the air-ejector is connected to the reflux pipe, and the solution is prevented from flowing out of the reservoir along the reflux pipe. Install a float valve in the reflux tube near the reservoir, The needle block is installed at the highest point so that it can only flow into the sample tube and be transferred to the sample container. The needle block needles should be the same length so that a certain amount or more of the solution flows through the gravity and the siphon action before the sample solution removes the sample container. It is configured to prevent the reverse flow to the side, minimizing the driving part, simple configuration of the device, increased durability, and simple operation, so as to eliminate various risks that may be caused by the operator's driving mistake, and also operating efficiency It is very economical because the manufacturing cost, maintenance cost, and maintenance cost are reduced. By installing only two float valves in conjunction with the vaccum camber, float valve, and gravity valve, the air-ejector can simply Can be collected and the remaining solution is It is automatically refluxed through the inflow pipe and the reflux pipe through the siphoning operation, and the needle block of the needle block is installed at a constant height so that the solution can always obtain the desired amount even when the solution in the reflux pipe flows back to the inflow pipe. Automatic liquid sampling device, characterized in that.

Description

Automatic liquid sampling device

The present invention relates to an automatic liquid sampling device, and more specifically, to an automatic liquid sample using an air-ejector capable of remotely sampling a highly toxic or radioactive solution-like substance from a storage container or a process pipe. It relates to a sampling device.

In general, liquid sampling devices with strong toxicity and radioactivity are usually operated remotely in shielded or enclosed spaces, especially in hot cells for high-level radioactive materials. Therefore, when equipment with a large number of driving parts such as pumps is used in these devices, problems such as equipment failure and leakage of solution require a lot of time to maintain the equipment and are particularly susceptible to exposure to these materials when waste is generated . Therefore, the sampling device should be able to guarantee the simplicity and durability with the minimum driving part, and the operation operation and maintenance should be simple.

The conventional sampling device used a syringe to transfer a solution from a storage container to a sample container, but recently, it is common to make an automated sample device using an ejector, and the basic concept is compressed air or steam supplied to the ejector. The sample solution mixed with is circulated to the solution reservoir of the process via the sample container and the ejector. However, these devices may have ejector blockages due to the volume change of the storage solution, the risk of contamination spreading, and the solution passing through the ejector, and in order to prevent the blockage of the ejector, install a valve pot in front of the ejector and install the ejector. After suctioning a certain amount into the suction pipe, supply a constant velocity of compressed air into the pipe and push the solution up to the sample vessel connected with the needle block. The device creates a differential pressure by installing an orifice much smaller than the inner diameter of the suction pipe at the bottom of the air inlet to push the solution upward in the solution suction line. After the certain amount is filled, the remaining solution continues to inflate with air, so it is refluxed through the reflux tube into the reservoir. Such a device transfers the solution to the sample container through a two-step process, which makes the device and operation operation relatively complicated.

It is an object of the present invention to solve the above problems can be operated remotely in a shielded or enclosed space, and can easily and quickly take a certain amount of sample periodically, to ensure durability and to simply perform the operation operation Its purpose is to make it possible.

In order to achieve the above object, the present invention is to install a float valve in front of the suction pipe of the air-ejector connected to the reflux pipe in order to block the solution flow into the air-ejector, and connect the suction pipe of the air-ejector with the reflux pipe, In order to block the solution from the reservoir along the reflux tube, a float valve is installed in the reflux tube near the reservoir, and the needle block is installed at the highest point so that the sample solution can only flow into the suction tube and be transferred to the sample container. By installing the needles the same length is characterized in that the sample solution is configured to prevent the flow of more than a certain amount of the back flow toward the suction pipe by the action of gravity and the syphony (Syphon) before removing the sample container.

1 is an overall flow chart in accordance with the present invention.

2 is a detailed view of an air-ejecter according to the present invention.

3 is a detailed view of a Vacuum chamber installed in a branch pipe.

4 is a detailed view of the baumum camber installed in the reflux tube.

5 is a detailed view of a float valve according to the present invention.

6 is a detailed view of a gravity valve in accordance with the present invention.

7 is a coupling diagram of a needle block and a sample container according to the present invention.

* Explanation of symbols for main parts of the drawings

1: Air-Ejector 11: Air-Ejector Inlet

12 air injector inlet 13 outlet

2,3: Float Valve 21,31: Baumum Camber

211,311: Compressed air supply port 212,312: Gravity valve connection port

213,313: Lower connector 214,314: Reflux tube at upper camber

22,32: Float valve 221,321: Float valve upper end connection

222,322: Float valve side end connection 223, 323: Float valve bottom end connection

224,324 Plotter 23,33 Gravity Valve

231,331: Gravity valve upper end connection 232,332: passage

234,334: Weight 233,333: Gravity valve lower end connection

235,335: Gravity valve body 236, 336: Lid

237,337: Adjustment screw 24,34: Pot

4: needle block 41: needle block body

42: injection needle 5: sample container

51: sample container lid 6: inlet tube

7: reflux pipe 8: branch line

9: reservoir

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a flow chart showing the main structural units of the automatic liquid sampling device, which is composed of an air-ejector 1, a float valve 2, 3, a needle block 4, and a sample container 5; The float valves (2) and (3) consist of Baumum cambers 21 and 31, float valves 22 and 32, gravity valves 23 and 33, and separation pots 24 and 34. have. In addition, three air-actuator valves (b, c, d) can be operated manually or automatically using a PLC controller, where valve a is used to supply constant compressed air to the device. Control valve and valve B is a valve that controls the compressed air supplied to the air-ejector 1 to create a negative pressure in the device and valves c and d are traces of solution that may remain in the device after draining the solution by gravity Is a control valve for discharging air to compressed air, and the suction pipe 6 and the reflux pipe 7 are constructed using stainless steel pipe.

2 shows a detailed view of the air ejector according to the present invention, in which the air ejector 1 forms a negative pressure in the apparatus by using a constant pressure of compressed air to inhale the solution of the reservoir 8 into the apparatus. Compressed air is controlled at a constant pressure by installing a constant pressure regulator (a) in front of the ejector inlet (11), and an on-off function is provided by installing an air-etuator valve (B) at the rear of the constant pressure regulator (a). Let's do it. Exhaust gas is discharged through the outlet 13 and in order to prevent the spread of contamination from the gas or mist introduced through the inlet 12 of the ejector connected to the baumum camber 21. gas system). Ejects have a high risk of problems such as equipment failure and fluid leakage when using equipment with a large number of moving parts such as pumps. In addition, the use of a device such as an air-ejector (1) with no moving parts improves this problem because it takes a lot of time to maintain these equipment, generates waste, and is particularly easy to expose workers to toxic or radioactive materials. The apparatus uses a commercially available product that can prevent corrosion, and installs a vaccum camber 21 and a float valve 22 in front of the air-ejector inlet 12 to prevent clogging.

3 is a detailed view of the vaccum camber installed in the branch pipe. The vaccum camber 21 includes a float valve upper end 221 and a gravity valve upper end 231, respectively, a camber lower end 213 and a gravity valve. It is connected to the connector 212, the solution in the device is automatically discharged by gravity, but if necessary to install a pressure regulator (a) and an air-etuator (c) in front of the compressed air supply port 211 to completely discharge . The camber 21 is able to maintain a constant negative pressure in the apparatus to prevent the unstable negative pressure generated by the air-ejector 1 from affecting the movement of the weight 234 embedded in the gravity valve 23. It is possible to precisely control the movement of the weight 234 without malfunction by installing and to prevent a small amount of the solution that can pass through the float valve 22 from the gas-liquid and finally prevent the flow into the air-ejector 1. It is composed.

4 is a detailed view of the vaccum camber installed in the reflux tube, and the float valve upper end connection 321 and the gravity valve upper end connection 331 are connected to the camber lower end connection 313 and the gravity valve connection 312, respectively. A solution is installed at the front end of the compressed air supply port 311, where a constant pressure regulator (a) and an air-etuator (d) are installed and refluxed from the needle block 4 along the reflux tube 7 to the camber 31 and the float valve. Pass 32 to reflux to the reservoir (8). At this time, when the camber upper reflux tube 314 is connected to the surface of the camber 31, such as the camber upper reflux tube 214, the refluxed solution may be refluxed through the gravity valve connector 312. The reflux tube 314 is extended inward.

Figure 5 shows a detailed view of the float valve according to the present invention, the two float valve upper connector 221, 321 is connected to the Baumum camber lower connector 213, 313, respectively, and the lower connector 213 313 is connected to the reflux tube 7 connecting the needle valve 4 to the float valve 3 in the case of the float valve 22 by a branch pipe 9, and in the case of the float valve 32, a reservoir ( 9) is directly connected. Float valve side connectors 222 and 322 are each connected to gravity valve lower connectors 233 and 333 with cylindrical stainless steel pots 24 and 34 having a gas-liquid separation function therebetween. The gravity valve upper connector 231, 331 is configured to be connected to the Baumum camber upper connector 211, 311, respectively.

When the float valves 22 and 32 enter the float valves 22 and 32 along the pipe connected with the solution introduced into the sample container 5, the floaters 224 and 324 float due to the introduced solution. When the plotters 224 and 324, which rise in the vertical direction by buoyancy, block the valve upper end connections 221 and 321 connected to the vacuum cambers 21 and 31, the solution flows into the float valves 22 and 32. Inflow stops. At the same time, the vaccum cambers 21 and 31 are balanced with the weight of the weights 234 and 334 embedded in the gravity valves 23 and 33 connected to the vaccum cambers 21 and 31. Negative pressure rises in), and the weights 234 and 334 built in the gravity valves 23 and 33 are moved in the vertical direction. At this time, the weight 234, 334 blocks the inlet of the passage 332 connected to the atmospheric pressure, and then opens, so that the device is connected through the float valve side connector 222, 322 connected to the pipe via the pot 24, 34. Since the internal pressure becomes atmospheric, the solution in the float valves 22 and 32 is automatically lowered to the sample container 5 by gravity. The floaters 224 and 324 embedded in the float valves 22 and 32 are cylindrical in size and can be appropriately adjusted according to the specific gravity of the solution and the specific gravity of the plotter material. However, the size of the plotters 224 and 324 should be as small as possible so that the amount of solution to be handled is small. The surface of the top cover of the plotter should be smoothly processed to close the upper tube 221 and 321, and the bottom part should be processed. The surface of the valve is made with a groove or a protrusion formed at the bottom of the valve to form a certain distance from the valve body so that the solution can be smoothly drained. In particular, in the case of the float valve 32, the gap between the floater 324 and the float valve body 325 so that the solution refluxed along the reflux tube 7 is stagnated in the camber 31 and does not flow into the gravity valve 33. In order to keep enough, the reflux tube 7 returned to the reservoir 8 is installed larger than the inner diameter of the upper reflux tube of the valve 32.

Figure 6 shows a detailed view of the gravitational valve according to the present invention, the gravitational valve upper connector 231, 331 is connected to the baumum camber (21) (31) and the lower connector 233, 333 Is connected to the float valve side connectors 222 and 322 and may open and close the passages 232 and 332 connected to atmospheric pressure by the weights 234 and 334. Threaded caps 236 and 336 are fitted to allow conical weights 234 and 334 to be placed on top of the gravity valves 235 and 335, and the body is centered on the caps 236 and 336. (235) (335) to form a hole smaller than the thread height than the inner diameter of the configuration to combine the adjustment screw 237 (337) to adjust the height of the inner space of the body (235) (335) have.

It is effective to wrap the outside of the weights 234 and 334 with Teflon tape so as to be in close contact with the inner diameter of the main body 235 and 335 to block the atmospheric pressure using the weights 234 and 334. The specific gravity, water head and frictional losses of the solution should be taken into account. Therefore, because the height of the weight changes according to the weight change of the weight, in order to adjust the height of the inner space of the valve, the thread is made on the outer side of the body to adjust.

7 is a diagram illustrating the coupling of the needle block and the sample container according to the present invention. The needle block body 41 is fixed, the inlet pipe 6 and the reflux tube 7 are installed in the body 41, and the inlet pipe ( 6) is directly connected to the reservoir (9) and the reflux tube (7) is connected to the reservoir (9) with the float valve (3) in between and introduced into the sample vessel (5) coupled to the needle block (4) When the solution is refluxed through the reflux tube (7) and flows into the float valve (2), the float valve (2) blocks the solution inflow, and the solution introduced into the valve by the blocked float valve (2) is the float valve (3). Reflux to the reservoir (9) through. At this time, the remaining solution remaining in the reflux pipe 7 from the needle block 4 to the point where the branch pipe 8 connected to the air-ejector 1 meets may be flowed back toward the inlet pipe 6 by the cyphon phenomenon. Therefore, the same length of the injection needle 42 is installed at the ends of the inflow tube 6 and the reflux tube 7 so that the height of one end of the injection needle 42 coincides with the surface of the sample solution of the sample container 5. The sample container lid 51 is made of a rubber-like material so that the needle block injection needle 42 penetrates and is completely sealed by adjusting a so that the solution in the sample container 5 is always present. When 5) is removed from the needle block 4, the solution in the reflux tube 7 and the inlet tube 6 is respectively refluxed into the storage container by the cyphon phenomenon.

The present invention configured as described above uses a device such as an ejector, a float valve, and a needle block to minimize the driving portion, and to simply configure the device, and to increase durability and simplify operation, which may be caused by an operator's mistake of operation. Not only can it eliminate various risks, but it is also very economical because it improves operation efficiency and reduces manufacturing cost, maintenance and repair cost, and the air-ejector can be installed by installing only two float valves connected with the baumum camber, float valve and gravity valve. The solution can be simply collected in the sample container only by the negative pressure formed in the device, and the remaining solution is automatically refluxed through the inlet tube and the reflux tube by gravity and cyphonic action, and the needle needle of the needle block has a constant height. When the solution on the reflux tube flows back to the inflow pipe, There are a lot of the effects that can be taken to the desired amount.

Claims (4)

A liquid sampling device; The sample block coupled to the needle block and the needle of the needle block is installed at the highest point and the inlet tube connected to the needle of the needle block and directly connected to the reservoir and the reflux tube connected to the needle of the needle block and connected to the reservoir It consists of a branch pipe connected to the reflux pipe and connected to the air-ejector, a reflux pipe close to the storage tank, and a float valve mounted on the branch pipe around the place where the reflux pipe and the branch pipe are connected. Automatic liquid sampling device, characterized in that to form a liquid sample. The method of claim 1; An automatic liquid sample collection device, characterized in that the length of the injection needle is adjusted so that the length of the injection needle provided in the needle block is the same and the height of one end coincides with the liquid level of the sample container. The method of claim 1; Float valves are installed in the reflux tube and the branch pipe connected to the reflux tube to collect samples in the sample container, and the solution in the reflux tube by the action of the float valve in the solution in the remaining device is automatically returned to gravity. And when the sample container is removed from the block, the remaining reflux tube and the solution in the suction tube are automatically refluxed through the reflux tube and the inlet tube to the storage tank by the cyphon action. The method of claim 3; Automatic liquid sampling device, characterized in that the reflux tube is extended to the inside of the vaccum camber of the float valve installed in the reflux tube.