JPH0321472Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a gas sampling device for sampling gas to be measured from a high temperature, high dust atmosphere.
It is equipped with a probe consisting of an outer tube and an inner tube slidably held by the outer tube. When sampling gas, the tip of the inner tube is pulled into a predetermined position inside the outer tube, and the gas is drawn through the inner tube. The present invention relates to a gas sampling device in which the tip of an inner tube is reciprocated within a predetermined range including the tip of the outer tube to scrape off deposits on the inner wall of the outer tube when sampling and cleaning.

[Conventional technology]

As a conventional gas sampling device, for example,
The one described in the -12720 publication is known.

As shown in FIG. 1, the gas sampling device described above includes an outer tube 4 having a jacket 1 on its outer periphery (refrigerant flows from an inlet 2 to an outlet 3), and a tip 5 connected to the outer tube 4.
and an inner tube 7 placed a little distance from the tip 6. The outer tube 4 is installed with the tip 6 located at the measurement gas sampling point (usually in a high temperature atmosphere),
The gas outlet 8 is connected to a suction device (not shown) via a solenoid valve 9, and the rear end 10 of the inner pipe 7 is connected to a water vapor source or a compressed air source (not shown) via a solenoid valve 11. It is configured to connect.

In the above configuration, gas is collected by opening the solenoid valve 9 and closing the solenoid valve 11 while flowing cooling water through the jacket 1, and driving the suction device to collect gas from the gas outlet 8. . At this time, at the gas inlet (tip 6 of the outer tube), the gas is cooled by the cooling water in the jacket 1 and the moisture in the gas is condensed, so most of the dust in the gas is removed from the outer tube. It adheres to the vicinity of the tip 6 (12 indicates the attached dust). As the measurement gas is continued to be sampled in this manner, the amount of the dust 12 attached increases. On the other hand, for cleaning to remove adhering dust, the solenoid valve 9 is closed and the solenoid valve 11 is opened, and a jet stream of water vapor or high-pressure air is applied to the dust 12 from the tip 5 of the inner tube 7 to blow off the dust 12. Therefore, by performing the above-mentioned cleaning operation as appropriate, the outer tube 4
It is possible to prevent the vicinity of the tip from being blocked by dust.

However, in the case of conventional gas sampling equipment, the tip of the inner tube is placed close to the place where dust adheres in order to increase the cleaning effect by applying a stronger jet flow from the tip of the inner tube to the deposits. Therefore, when collecting gas (the jet flow from the tip 5 is stopped),
There is a possibility that the dust adhesion near the tip of the outer tube 4 may extend to the tip 5 of the inner tube 4 and clog the tip 5 with dust. Moreover, once the tip is blocked, the dust cannot be easily removed, resulting in troublesome maintenance.

[Purpose of invention]

The present invention has been made in view of this point, and an object of the present invention is to realize a gas sampling device in which dust is less likely to adhere to the tip of an inner tube provided for removing dust attached to an outer tube.

[Structure of the invention]

The gas sampling device of the present invention that achieves the above objectives is:
A probe consisting of an outer tube whose tip is positioned at a gas sampling point and an inner tube having a gas extraction section at its rear end and whose tip is positioned at the tip of the outer tube and slidably held by the outer tube. , holding the tip of the inner tube at a predetermined position within the outer tube away from the tip of the outer tube by an external signal, or reciprocating the tip of the inner tube between the holding position and the tip of the outer tube. It consists of a drive unit that operates the device.

[Example of idea]

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

FIG. 2 is a configuration diagram showing an embodiment of the present invention. The gas sampling device has a flanged jacket 21 on the outer periphery (the refrigerant enters from the connection port 22 and connects to the connection port 23).
A probe 27 (the rear end of the outer tube 24 has an O-ring 28 and a cap nut 29 ), and the tip 30 of the probe 27
(the tip of the outer tube 24) is positioned and installed at the measurement gas sampling point. The inner tube 26 has a length sufficient to allow its distal end 31 to reach the distal end 30 of the outer tube in the held state, and is connected to the drive section 34 via a flange 33 at the rear end 32. .
By operating the drive unit 34, the tip 31 can be reciprocated between the tip 30 of the outer tube and a predetermined position A away from the tip (near the flange attachment portion of the outer tube 24). There is. Further, the rear end 32 of the inner tube 26 is provided with a gas extraction portion 35 . Drive part 3
4 is a piston shaft 36 that is integrated with the probe 27.
and 37 to the flange 33; and air cylinders 38 and 39.
Three-way solenoid valves 41 and 42 (each having ports a, b, and c) that connect the respective cylinder chambers to the compressed air source 40 or the atmosphere, and a control unit that controls the energization of the three-way solenoid valves 41 and 42. (not shown). The gas extraction section 35 has a substantially cylindrical container 45 that connects a flange 44 fixed to the open end 43 to the flange 33 and communicates with the inner tube 26, and a filter 46 at one end inserted into the container 45. The other end is connected to a suction device (not shown) via a three-way solenoid valve 47 (having ports a, b, and c, with port b connected to the compressed air source 40) and a two-way solenoid valve 48. A gas extraction pipe 49 to be connected, a backwashing air pipe 51 having one end conducted into the container 45 and the other end connected to the compressed air source 40 via a two-way solenoid valve 50, a solenoid valve 47, It is comprised of a control section (not shown) that controls the energization of 48 and 50.

In the above configuration, gas sampling is performed by controlling ports a and c of the solenoid valve 41 and the ports a and c of the solenoid valve 41 according to a signal from the control section while flowing cooling water through the jacket 21.
Ports a and b of 2 are electrically connected to each other. Thereby, the drive unit 34 moves the inner tube 26 to a predetermined position (the position where the tip 31 reaches position A) and maintains that state. In this state, when the solenoid valve 50 is closed and the ports a and c of the solenoid valve 47 are made conductive by a signal from the control section, and the solenoid valve 48 is opened and the suction device is driven, the measurement gas sampling point is The gas flows from the tip of the outer tube 30 → the inner tube 26 → the filter 4
6→Gas is collected through a flow path consisting of a gas extraction pipe 49. At this time, the gas flowing through the flow path is
4 (cooling of the jacket 21, which is cooled by water), and the moisture in the gas condenses. As a result, dust in the gas adheres to the inside of the outer tube 24. However, as mentioned above, the tip 31 of the inner tube 26 is now at position A, and a gas flow is formed using the tip 31 as the inlet, so the above-mentioned adhesion phenomenon occurs at the tip 31 of the inner tube 26. does not occur.

On the other hand, the operation of cleaning the dust attached to the outer tube 24 is performed by stopping the operation of the suction device in response to a signal from the control section, closing the solenoid valve 48 and opening the solenoid valve 50, and then opening the ports a and b of the solenoid valve 41. Also, solenoid valve 4
The operation of conducting the ports a and c of 2 and the solenoid valve 41
Ports a and c of the solenoid valve 47 and ports b and c of the solenoid valve 47 are brought into conduction while alternately performing the operation of conducting the ports a and c of the solenoid valve 42 several times. This results in
Dust adhering to the vicinity of the tip 30 of the outer tube 24 is scraped off by the tip 31 of the inner tube 26 and is discharged outside the probe 27 by the compressed air flow introduced through the backwashing air conduit 51. be done. Also, solenoid valve 47
is discharged out of the probe 27 by a compressed air flow introduced through the probe. The compressed air flow introduced via the solenoid valve 47 also cleans the mesh of the filter 46.

In FIG. 2, there is a gap between the inner circumferential surface of the outer tube 24 and the outer circumferential surface of the inner tube 26, but this gap is minute, and when dust adheres, the inner diameter of the outer tube 24 becomes smaller than that of the inner tube. Since the outer diameter of the inner tube 26 is smaller than the outer diameter of the inner tube 26,
Dust adhering to the inner surface of the outer tube is scraped off by the reciprocating movement of the outer tube.

Both the gas sampling apparatus of the present invention and the conventional gas sampling apparatus shown in FIG. 1 are similar in that the inner tube becomes clogged when dust adheres to the tip of the inner tube. However, in the gas sampling device of the present invention, the inner tube is placed at the back of the tip of the outer tube when gas is sampled, so dust is less likely to stick to the tip of the inner tube than in conventional methods. It differs from

It should be noted that the present invention is not limited to the above-mentioned embodiment, and for example, the drive unit 34 may be driven by a hydraulic cylinder or a motor. Also, the drive unit 34 is installed outside the probe 27, and the drive unit 34 and the inner tube 2
6 may be provided.

[Effect of idea]

As explained above, the gas sampling device of the present invention includes a probe consisting of an outer tube and an inner tube slidably held by the outer tube, and when sampling gas, the tip of the inner tube is connected to the outer tube. Since it is held at a predetermined position within the outer tube away from the tip and within the flow of sampled gas, the tip of the inner tube can be prevented from becoming clogged with dust. Furthermore, during cleaning, the tip of the inner tube is reciprocated between the holding position and the tip of the outer tube, so that dust and the like attached to the inner wall of the inner tube can be reliably scraped off with the tip of the inner tube. Therefore, according to the present invention, it is possible to realize a gas sampling device in which dust is less likely to adhere to the tip of the inner tube, which is provided to remove dust attached to the tip of the outer tube.

[Brief explanation of drawings]

Figure 1 is a configuration diagram of a conventional gas sampling device;
The figure is a configuration diagram showing an embodiment of the present invention. 21...jacket, 24...outer tube, 26...
Inner tube, 27... Probe, 34... Drive unit, 35
...Gas extraction section.

Claims (1)

[Scope of utility model registration request] A probe consisting of an outer tube whose tip is positioned at a gas sampling point and an inner tube having a gas extraction section at its rear end and whose tip is positioned at the tip of the outer tube and slidably held by the outer tube. , holding the tip of the inner tube at a predetermined position within the outer tube away from the tip of the outer tube by an external signal, or reciprocating the tip of the inner tube between the holding position and the tip of the outer tube. A gas sampling device characterized by comprising a driving section for operating the device.