KR101003110B1 - Gas sampling apparatus - Google Patents

Abstract

The present invention relates to a gas sampling device that accurately measures the change in physical properties and physical properties of a gas at a sampling time point by overcoming the time difference between the sampling time point and the display time point of a flowing gas. Gas sampling apparatus of the present invention, the gas flows in accordance with the flow tube, the sampling cylinder connected to the flow tube for sampling the gas, a sensor for sensing the physical properties of the gas introduced into the sampling cylinder, and the detection signal of the gas It includes a monitor that displays physical properties.

Gas, Sampling, Flow Tube, Physical Properties, Humidifier, Humidifier

Description

Gas Sampling Device {GAS SAMPLING APPARATUS}

The present invention relates to a gas sampling device, and more particularly, to a gas sampling device for measuring a change in physical and physical properties of a gas by sampling a flowing gas.

It is necessary to measure the physical and physical property changes of the flowing gas. For example, hydrogen and air are supplied as fuel to a stack of a fuel cell, and a humidifier mixes moisture with hydrogen and air with moisture to supply the stack.

In order to test the performance of the humidifier, the humidity contained in the gas (for example, a mixed gas of hydrogen and moisture or a mixed gas of air and moisture) through the humidifier at each time point is measured to measure the change in the physical properties of the gas during the period. Needs to be.

For example, by installing a humidity sensor in the flow tube, connecting the humidity sensor to the control unit, and connecting the monitor to the control unit, and displaying the detection signal of the humidity sensor on the monitor, to measure the change in physical properties or properties of the gas passing through the flow tube can do.

In this case, a time difference actually occurs between the time when the gas passes through the humidity sensor of the flow pipe and the time when the measured humidity is displayed on the monitor. Therefore, it is difficult to accurately measure the change in physical and physical properties of the gas at a specific point in time.

An embodiment of the present invention relates to a gas sampling device for accurately measuring the physical properties and changes in physical properties of a gas at a sampling time by overcoming the time difference between a sampling time and a display time of a flowing gas.

According to an embodiment of the present invention, a gas sampling device includes a flow tube through which gas flows, a sampling cylinder connected to the flow tube for sampling gas, a sensor for sensing physical properties of gas introduced into the sampling cylinder, and detection of the sensor It may include a monitor for displaying the properties of the gas in accordance with the signal.

The sampling cylinder may be formed in plural, the flow pipe may form sampling holes corresponding to the number of the sampling cylinders, and the sampling holes may be connected to each of the plurality of sampling cylinders through a gas inflow line.

The sampling holes may be arranged at equal intervals along the circumference of the flow tube.

The sampling cylinder includes a gas inlet hole connected to a gas inlet line to introduce the sampling gas, a sensor hole in which the sensor is installed, and a gas discharge hole connected to a gas discharge line to discharge the gas detected by the sensor. can do.

The sampling cylinder may further include a gas inflow control solenoid valve provided in the gas inflow line and connected to the control unit, and a gas discharge control solenoid valve provided in the gas discharge line and connected to the control unit.

The gas sampling apparatus according to an embodiment of the present invention may further include a gas line heater provided in the first chamber in which the gas inflow line is provided and connected to the controller.

The gas sampling device according to an embodiment of the present invention may further include a gas line temperature sensor provided in the first chamber and connected to the controller.

The gas sampling apparatus according to an embodiment of the present invention may further include a sampling cylinder heater provided in the second chamber in which the sampling cylinder is provided and connected to the controller.

The gas sampling device according to an embodiment of the present invention may further include a sampling cylinder temperature sensor provided in the second chamber and connected to the controller.

The sensor may include a humidity sensor and a temperature sensor, and the sensor hole may include a humidity sensor hole in which the humidity sensor is installed and a temperature sensor hole in which the temperature sensor is installed.

The sampling cylinder includes a cylinder liner, a piston embedded in the cylinder liner, and lifting and lowering, a piston forming a space in which sampling gas is introduced and discharged on one side, a rod connected to the piston and forming a rack on one side, and a rod of the rod. It may include a step motor for driving the pinion coupled to the rack.

The sampling cylinder may include a cylinder liner, a piston built in the cylinder liner, and lifting and lowering, a piston forming a space in which sampling gas is introduced and discharged on one side, and an elastic member elastically supporting the piston. .

The sampling cylinder is provided in the second chamber, the cylinder liner, the piston is built in the cylinder liner to move up and down, to form a space in which the sampling gas is introduced and discharged on one side, and to act and release the negative pressure to the piston It may include a vacuum pump and a pressure pump connected to the second chamber.

The sampling cylinder includes a cylinder liner, a piston embedded in the cylinder liner, and moving upward and downward, forming a space in which sampling gas is introduced and discharged on one side, a rod connected to the piston and having a holder on one side, and the holder. It may include a step motor for driving the screw is coupled.

The flow pipe is disposed in front of and behind the connection part connected to the sampling cylinder to interlock the flow of gas between the first check valve and the second check valve, between the first check valve and the second check valve to the flow pipe. It may include a purge line connected to, and a purge valve disposed in the purge line to control the supply of purge air.

As described above, the gas sampling apparatus according to the exemplary embodiment of the present invention connects a sampling cylinder to a flow tube to sample gas at one time point, and detects physical properties of the gas introduced into the sampling cylinder with a sensor and displays the gas on the monitor. There is an effect of overcoming the parallax between the viewpoint and the display viewpoint. Therefore, there is an effect of accurately measuring the physical properties of the gas and the change of physical properties during the period at the sampling point.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

1 is a configuration diagram of a gas sampling apparatus according to a first embodiment of the present invention, and FIG. 2 is a control block diagram of the gas sampling apparatus of FIG.

1 and 2, the gas sampling apparatus 1 of the first embodiment includes a flow tube 10 through which gas flows, a sampling cylinder 20 for sampling gas from the flow tube 10, and physical properties of the sampled gas. Sensor 30 for sensing and measuring, and a monitor 40 for indicating changes in physical and physical properties.

The target gas, which is to measure physical properties and physical property changes, flows through the flow tube 10, and an inspection target device (not shown) for supplying the target gas is connected to one side of the flow tube 10. The other side of the flow tube 10 is opened to discharge the gas.

The device to be inspected may be variously formed, and properties of the target gas may also vary. For example, the device to be inspected may be a humidifier (not shown) for supplying moisture to hydrogen or air supplied to the stack of the fuel cell, and in this case, the physical property and the physical property change may be humidity.

In the gas sampling device 1, the sensor 30 may be appropriately selected according to the physical properties of the sensing object. When the object to be detected is humidity, the sensor 30 may be a humidity sensor 31 and a temperature sensor 32.

For convenience, the first embodiment samples the target gas with the sampling cylinder 20 connected to the flow tube 10, measures the physical properties of the gas at the sampling time, that is, the humidity, with the sensor 30, and displays it on the monitor 40. The gas sampling apparatus 1 is illustrated.

In addition, the gas sampling device 1 of the first embodiment samples the target gas continuously with a plurality of sampling cylinders 20 connected to the flow pipe 10 with a certain time difference, and uses the sensor 30 to measure the physical properties of the gas during the sampling period. The change, that is, the humidity change, is formed to be displayed and displayed on the monitor 40.

3 is a perspective view of a flow tube in the gas sampling device of FIG. Referring to FIG. 3, the flow tube 10 forms a connecting portion 11 connected to the sampling cylinder 20, and first and second check valves 12 and 13 are installed at the front and the rear of the connecting portion 11. do. According to the opening and closing operations of the first and second check valves 12 and 13, the gas flows / stops in the flow pipe 10.

In addition, the flow pipe 10 further includes a purge line 14 connected between the first and second check valves 12 and 13, and the purge line 14 is provided with a purge valve 15. According to the opening and closing operation of the purge valve 15, the purge air is supplied / blocked to the flow pipe (10).

In the sampling process, since the purge valve 15 is closed and the first and second check valves 12 and 13 are opened, the gas is sampled into the sampling cylinder 20 while flowing the flow tube 10.

After sampling, since the purge valve 15 is opened while the first and second check valves 12 and 13 are closed, purge air is supplied to the sampling cylinder 20 to discharge the gas in the sampling cylinder 20. Let's do it.

In other words, after one gas sampling, it is necessary to block the humidity of the preceding process from affecting the humidity of the subsequent process in the subsequent gas sampling. Therefore, the purge air is dry air, and can effectively discharge air including moisture in the sampling cylinder 20.

4 is a cross-sectional view of FIG. 3. 1 and 4, the flow tube 10 includes sampling holes 16 corresponding to the number of sampling cylinders 20 provided in plurality. Sampling holes 16 are formed in the connecting portion 11 of the flow tube 10.

As an example, in the first embodiment, ten sampling holes 16 are formed in the connecting portion 11, and ten sampling cylinders 20 are provided. Therefore, the gas sampling apparatus 1 of the first embodiment may sense the physical property of the gas at 10 time points during the unit sampling interval and measure the change in the physical property of the gas.

Sampling holes 16 are each connected to sampling cylinder 20 via gas inlet line 17. Accordingly, the sampling holes 16 and the gas inflow lines 17 may supply sampling gas to each sampling cylinder 20.

The sampling holes 16 are arranged at equal intervals along the circumference of the flow tube 10, more specifically, the circumference of the connecting portion 11. Therefore, gas sampling through the sampling holes 16 may be sampled under relatively the same conditions in each sampling cylinder 20.

Referring to FIG. 3, a connecting member 19 for connecting the sampling hole 16 and the gas inlet line 17 may be used. For example, the connection member 19 may be formed of the first connection member 191 and the second connection member 192.

The first connection member 191 is screwed to the sampling hole 16 to one side. The second connection member 192 enables the insertion of the gas inflow line 17 to one side, and is screwed to the first connection member 191 to the other side so that the gas inflow line 17 to the first connection member 191 is provided. ).

The first connection member 191 connects the sampling hole 16 and the inside of the flow pipe 10 to the gas inflow line 17 through the inner through hole 191a.

5 is a perspective view of a sampling cylinder in the gas sampling device of FIG. 1 and 5, the sampling cylinder 20 forms a gas inlet hole 201, a sensor hole 202, and a gas outlet hole 203.

The gas inlet hole 201 is connected to the gas inlet line 17. That is, the gas inlet hole 201 connects the sampling cylinder 20 to the flow pipe 10 through the gas inlet line 17.

The sensor 30 is installed in the sensor hole 202. The sensor 30 may include a humidity sensor 31 and a temperature sensor 32 electrically connected to the controller 50. Therefore, the sensor hole 202 is formed of a humidity sensor hole 202a in which the humidity sensor 31 is installed and a temperature sensor hole 202b in which the temperature sensor 32 is installed.

The humidity sensor 31 and the temperature sensor 32 detect physical properties of the gas sampled in the sampling cylinder 20, that is, humidity and temperature, and apply a detection signal to the controller 50 to display on the monitor 40. To be able.

The gas discharge hole 203 is connected to the gas discharge line 18. That is, the gas discharge hole 203 connects the sampling cylinder 20 to the outside through the gas discharge line 18, senses and measures physical properties, and then discharges the gas out of the sampling cylinder 20.

Referring back to FIG. 1, the sampling cylinder 20 includes a gas inflow control solenoid valve S17 and a gas discharge control solenoid valve S18.

The gas inflow control solenoid valve S17 is installed on the gas inflow line 17 and is electrically connected to the controller 50. The gas inflow control solenoid valve S17 is operated according to the control signal of the controller 50 to open / close the gas inflow line 17 to introduce / block the sampling gas into the sampling cylinder 20.

The gas discharge control solenoid valve S18 is installed on the gas discharge line 18 and is electrically connected to the controller 50. The gas discharge control solenoid valve S18 is operated according to the control signal of the control unit 50 to open / close the gas discharge line 18 to detect and measure physical properties of the gas, and then discharge / block the sampling gas from the sampling cylinder 20. do.

In the sampling process, the gas inflow control solenoid valve S17 is opened, the gas discharge control solenoid valve S18 is closed, and the sampling gas is introduced into the sampling cylinder 20.

After sampling, in the purge process, the gas inflow control solenoid valve S17 and the gas discharge control solenoid valve S18 are opened, and the purge air is discharged through the sampling cylinder 20.

Referring again to FIG. 5, the sampling cylinder 20 is a stepper motor 216 connected to the cylinder liner 211, the piston 212, the rod 214 forming the rack 213, and the pinion 215. It includes.

Briefly, in the cylinder liner 211, one side is closed and the other side is open, and the gas inlet hole 201, the sensor hole 202 and the gas discharge hole 203 are formed in the closed side, and the open side. The rod 214 connected to the piston 212 in the lifting operation.

The piston 212 is built in the cylinder liner 211 and lifts and acts to introduce the sampling gas into the closed side internal space and discharge the introduced sampling gas.

For the lifting action of the piston 212, the rod 214 is connected to the piston 212 at one end and forms a rack 213 at the other end. The rack 213 is coupled to the pinion 215.

As the stepper motor 216 is driven, the pinion 215 is rotated forward and reverse, the rack 213 is moved forward and backward, and the piston 212 connected to the rod 214 is raised and lowered.

The step motor 216 is provided in plural, disposed 1: 1 in each sampling cylinder 20, and electrically connected to the controller 50. Accordingly, the plurality of step motors 216 may be driven at different time points having a parallax in one section according to the control signal of the controller 50, so that gas at different time points may be sampled to each sampling cylinder 20. .

Here, the gas sampling process is outlined. When the purge valve 15 is closed and the first and second check valves 12 and 13 are opened, gas flows into the flow tube 10. The purge valve 15, the first and second check valves 12, 13 may be operated manually and may be electrically controlled by being connected to the controller 50.

The step motor 216 is operated while the gas inflow control solenoid valve S17 is opened and the gas discharge solenoid valve S18 is closed. Accordingly, when the rod 214 and the piston 212 descend through the pinion 215 and the rack 213, the sampling gas flows into the cylinder liner 211 through the flow pipe 10 and the gas inflow line 17. do.

When the humidity sensor 31 and the temperature sensor 32 sense the humidity and the temperature of the sampling gas and apply them to the controller 50, the humidity and the temperature are displayed on the monitor 40. Therefore, the physical properties of the sampling point of the gas flowing in the flow tube 10 can be confirmed.

In controlling the gas inflow control solenoid valve S17, the gas discharge control solenoid valve S18, and the step motor 216, if the time difference is maintained for each sampling cylinder 20, the sampling gas is stored in each sampling cylinder 20. Inflow with a time difference in), you can check the gas properties change in one section.

After sampling, the purge process is outlined. When the first and second check valves 12 and 13 are closed and the purge valve 15 is opened, purge air is supplied to the flow pipe 10.

With the gas inflow control solenoid valve S17 and the gas discharge solenoid valve S18 open, the step motor 216 is operated in reverse. Accordingly, when the rod 214 and the piston 212 rise through the pinion 215 and the rack 213, the sampling gas is discharged from the inside of the cylinder liner 211 through the gas discharge line 18.

In the overall configuration, since the second to fourth embodiments of the present invention are similar to the first embodiment, the description of the same parts will be omitted here and the different parts will be compared.

6 is a configuration diagram of a gas sampling apparatus according to a second embodiment of the present invention, and FIG. 7 is a control block diagram of the gas sampling apparatus of FIG.

6 and 7, the gas sampling device 2 of the second embodiment forms the first chamber 21 and the second chamber 22. For convenience, in FIG. 6, the first chamber 21 and the second chamber 22 are partitioned by boundaries.

The first chamber 21 forms a space for accommodating the gas inflow line 17, and includes a gas line heater 171 connected to the controller 50. In addition, the first chamber 21 includes a gas line temperature sensor 172 connected to the controller 50.

The gas line temperature sensor 172 senses the temperature in the first chamber 21, and the gas line heater 171 is operated according to the temperature level. Therefore, moisture contained in the gas sampled and flowing into the gas inflow line 17 is prevented from condensing, so that the sample in the sampling cylinder 20 enables accurate measurement of the gas properties.

The second chamber 22 forms a space for accommodating the sampling cylinder 20 and includes a sampling cylinder heater 221 connected to the controller 50. The second chamber 22 also has a sampling cylinder temperature sensor 222 connected to the controller 50.

The sampling cylinder temperature sensor 222 senses the temperature in the second chamber 22, and the sampling cylinder heater 221 is operated according to the temperature level. Therefore, the moisture contained in the gas in the sampling cylinder 20 is prevented from condensing, so that the sample in the sampling cylinder 20 enables accurate measurement of the gas properties.

8 is a perspective view of a sampling cylinder and a cylinder block in the gas sampling apparatus according to the third embodiment of the present invention.

8, in the gas sampling apparatus 3 according to the third embodiment, the sampling cylinder 320 includes a cylinder liner 321, a piston 322, a rod 324 forming a support 323, and It includes an elastic member 326 connected to the support 323.

In the third embodiment, the elastic member 326 is formed of a tension spring, the elastic member 326 is elastically connected to the piston 322 through the support 323 and the rod 324.

According to the opening and closing operation of the gas inflow control solenoid valve S17, the sampling gas is introduced into the sampling cylinder 320 through the gas inflow line 17. At this time, when the gas inflow control solenoid valve S17 is opened, the elastic member 326 in the expanded state is contracted and the piston 322 is lowered to introduce the sampling gas.

9 is a perspective view of a sampling cylinder and a cylinder block in the gas sampling apparatus according to the fourth embodiment of the present invention.

9, in the gas sampling apparatus 4 according to the fourth embodiment, the sampling cylinder 420 is provided in the second chamber 22, and the cylinder liner 421, the piston 422, the vacuum pump ( 423 and pressure pump 424.

The vacuum pump 423 and the pressure pump 424 are connected to the second chamber 22 to apply negative pressure and positive pressure to the piston 422, respectively.

When the negative pressure by the vacuum pump 423 acts on the piston 422, the sampling gas flows into the sampling cylinder 420 by the lowering of the piston 422.

When a positive pressure is applied to the piston 422 by the pressure pump 424, the sampling gas is discharged from the sampling cylinder 420 as the piston 422 rises.

10 is a perspective view of a sampling cylinder according to another embodiment in the gas sampling device of FIG. Here, parts different from the first embodiment will be described.

Referring to Figure 10, the sampling cylinder 220 transmits the drive of the step motor 516 to the piston 212 through the ball screw. That is, the sampling cylinder 220 includes a cylinder liner 211, a piston 212, a rod 514, a holder 513, a screw 515, and a step motor 516.

The rod 514 is provided in plurality to connect the piston 212 and the holder 513 to each other. The holder 513 forms a screw groove on the inner circumferential surface of the through hole and includes a ball (not shown) in the screw groove. The screw 515 is inserted into the through hole of the holder 513 to screw the ball into the medium. The step motor 516 is connected to one side of the screw 515 to operate in the forward and reverse rotation.

As the step motor 516 is driven, the screw 515 is rotated forward and reverse, and accordingly, the holder 513 is lifted and operated, and the piston 512 connected to the rod 514 is lifted and sampled. Inlet and exhaust gas.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

1 is a configuration diagram of a gas sampling device according to a first embodiment of the present invention.

FIG. 2 is a control block diagram of the gas sampling apparatus of FIG. 1.

3 is a perspective view of a flow tube in the gas sampling device of FIG.

4 is a cross-sectional view of FIG. 3.

5 is a perspective view of a sampling cylinder in the gas sampling device of FIG.

6 is a configuration diagram of a gas sampling device according to a second embodiment of the present invention.

7 is a control block diagram of the gas sampling apparatus of FIG.

8 is a perspective view of a sampling cylinder and a cylinder block in the gas sampling apparatus according to the third embodiment of the present invention.

9 is a perspective view of a sampling cylinder and a cylinder block in the gas sampling apparatus according to the fourth embodiment of the present invention.

10 is a perspective view of a sampling cylinder according to another embodiment in the gas sampling device of FIG.

<Explanation of symbols for the main parts of the drawings>

1, 3, 4: gas sampling device 10: flow pipe

20, 220, 320, 420: sampling cylinder 40: monitor

50 control unit 11 connection

12, 13: 1st, 2nd check valve 14: Purge line

15: purge valve 16: sampling hole

17 gas inlet line 18 gas outlet line

19: connecting member 171: gas line heater

172: gas line temperature sensor 191, 192: first, second connection member

191a: through hole 201: gas inlet hole

202: sensor hole 203: gas discharge hole

202a: humidity sensor hole 202b: temperature sensor hole

31: humidity sensor 32: temperature sensor

211, 311, 411: Cylinder liner 212, 312, 412: Piston

213: rack 214, 314, 514: rod

215: pinion 216, 516: step motor

513: holder 515: screw

21 and 22: first and second chamber 221: sampling cylinder heater

222: sampling cylinder temperature sensor 313, 323: support

316: elastic member 413: vacuum pump

414: pressure pump S17: gas inlet control solenoid valve

S18: Gas Discharge Control Solenoid Valve

Claims (15)

A flow tube through which gas flows; A sampling cylinder connected to the flow tube for sampling gas; A sensor for detecting physical properties of the gas introduced into the sampling cylinder; And A monitor for displaying the physical properties of the gas in accordance with the detection signal of the sensor, The sampling cylinder is formed in plurality, The flow tube forms sampling holes corresponding to the number of sampling cylinders, And the sampling holes are connected to each of the plurality of sampling cylinders through a gas inlet line. delete According to claim 1, The sampling holes are arranged at equal intervals along the circumference of the flow pipe. According to claim 1, The sampling cylinder, A gas inlet hole connected to a gas inlet line to introduce the sampling gas; A sensor hole in which the sensor is installed, and And a gas discharge hole connected to a gas discharge line to discharge the gas detected by the sensor. 5. The method of claim 4, The sampling cylinder, A gas inflow control solenoid valve provided in the gas inflow line and connected to a control unit; And a gas discharge control solenoid valve provided in the gas discharge line and connected to the control unit. 5. The method of claim 4, And a gas line heater provided in the first chamber in which the gas inflow line is provided and connected to the control unit. The method according to claim 6, And a gas line temperature sensor provided in the first chamber and connected to the control unit. The method according to claim 6, And a sampling cylinder heater provided in the second chamber provided with the sampling cylinder and connected to the control unit. The method of claim 8, And a sampling cylinder temperature sensor provided in the second chamber and connected to the control unit. 5. The method of claim 4, The sensor includes a humidity sensor and a temperature sensor, The sensor hole is a gas sampling device including a humidity sensor hole in which the humidity sensor is installed and a temperature sensor hole in which the temperature sensor is installed. According to claim 1, The sampling cylinder, Cylinder liners, A piston which is built in the cylinder liner and lifts and forms a space in which a sampling gas is introduced and discharged on one side; A rod connected to the piston and forming a rack on one side; and And a step motor for driving a pinion coupled to the rack of the rod. According to claim 1, The sampling cylinder, Cylinder liners, A piston which is built in the cylinder liner and lifts and forms a space in which sampling gas is introduced and discharged on one side; Gas sampling device comprising an elastic member for elastically supporting the piston. According to claim 1, The sampling cylinder, It is provided in the second chamber, Cylinder liners, A piston which is built in the cylinder liner and lifts and forms a space in which sampling gas is introduced and discharged on one side; And a vacuum pump and a pressure pump connected to the second chamber to apply and release negative pressure to the piston. According to claim 1, The sampling cylinder, Cylinder liners, A piston which is built in the cylinder liner and lifts and forms a space in which a sampling gas is introduced and discharged on one side; A rod connected to the piston and having a holder on one side; Gas sampling device comprising a step motor for driving a screw coupled to the holder. According to claim 1, The flow pipe, A first check valve and a second check valve disposed at the front and the rear of the connection part connected to the sampling cylinder to regulate the flow of gas; A purge line connected to the flow tube between the first check valve and the second check valve, and And a purge valve disposed in the purge line to control a supply of purge air.

Images