JP2014145681A - Droplet capture device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a droplet capture device capable of directly capturing droplets in a tube bundle.SOLUTION: A droplet capture device 1 includes: a capture member 15 capturing droplets L1 flowing in a tube bundle; an external cylindrical pipe 16 which stores the capture member 15 inside and on which an opening 21 facing the capture member 15 is formed; a holding rod 18 which holds the capture member 15 and which is inserted into the external cylindrical pipe 16; and a shutter pipe 17 which is provided between the external cylindrical pipe 16 and the holding rod 18, on which a shutter opening capable of facing the opening 21 is formed, and which can open and close the opening 21.

Description

  The present invention relates to a droplet trapping device that traps droplets in a tube group.

  2. Description of the Related Art Conventionally, a two-phase flow measuring device is known as a device for measuring droplets in a tube group (see, for example, the conventional technique of Patent Document 1). This two-phase flow measuring device includes an electric resistance type two-probe probe including an upstream probe and a downstream probe. The two-phase flow measurement device uses the signals from the upstream probe and the downstream probe to determine the time that bubbles in the liquid phase or droplets in the gas phase are in contact with the probe, and the bubbles or droplets from the upstream probe. The frequency distribution is obtained based on the difference in time of contact with the downstream probe.

JP-A-6-3365

  Incidentally, in order to model and analyze the flow state of the gas-liquid two-phase flow in the tube group, it is required to measure the flow state of the droplet in the tube group in more detail. However, in Patent Document 1, since a droplet is indirectly measured using an electric resistance type two-probe probe, it is difficult to grasp the flow state of the droplet in detail.

  Therefore, an object of the present invention is to provide a droplet capturing device that can directly capture droplets in a tube group.

  The droplet capturing apparatus of the present invention includes a capturing member that captures droplets flowing in a tube group, an outer tube that accommodates the capturing member therein and has an opening facing the capturing member, And a shutter member capable of opening and closing the opening.

  According to this configuration, the droplet can be captured by the capturing member by opening and closing the opening of the outer tube with the shutter member. Thereafter, the capturing member is taken out and the captured droplet is directly measured, whereby the flow state of the droplet can be measured with higher accuracy. In addition, as a fluid state of a droplet, it is the droplet diameter and number (droplet diameter distribution) of a droplet, for example.

  In this case, the holding member is further provided with a cylindrical holding member that is inserted into the outer tube, and the shutter member is formed in a cylindrical shape, and the outer tube and the A shutter opening provided between the holding member and facing the opening is formed, and the opening is opened by facing the shutter opening by rotation of the shutter member, while other than the shutter opening. It is preferable to be blocked by facing the part.

  According to this configuration, the opening can be easily opened and closed by rotating the shutter member. In addition, the capture member can be easily housed and taken out by inserting and removing the holding member with respect to the outer tube.

  In this case, it is preferable to further include an operation member fixed to the shutter member and provided so as to protrude radially outward from the shutter member.

  According to this configuration, since the shutter member can be rotated by operating the operation member, it is possible to manually open and close the opening.

  In this case, the capturing member is preferably a gel-like member.

  According to this configuration, when a droplet hits the gel-like capturing member, the capturing member is able to capture the droplet suitably because a portion where the droplet hits is depressed. Examples of the gel-like member include grease and silicone.

  In this case, it is preferable to further include a seal member that hermetically seals between the outer tube and the shutter member.

  According to this configuration, since the space between the outer tube and the shutter member can be hermetically sealed by the seal member, the state in the tube group is, for example, a pressurized state, a negative pressure state, a high temperature state, a low temperature Even in the state, the droplet can be captured.

FIG. 1 is a schematic configuration diagram of a droplet trapping apparatus according to the present embodiment. FIG. 2 is an explanatory diagram of a tube group provided with a droplet trapping device. FIG. 3 is a cross-sectional view of the droplet trapping device when the opening is opened. FIG. 4 is a cross-sectional view of the droplet capturing device when the opening is closed. FIG. 5 is a schematic configuration diagram of the droplet trapping device when the holding rod is pulled out. FIG. 6 is a schematic configuration diagram of a droplet capturing device according to a modification.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  FIG. 1 is a schematic configuration diagram of a droplet trapping apparatus according to the present embodiment. FIG. 2 is an explanatory diagram of a tube group provided with a droplet trapping device. FIG. 3 is a cross-sectional view of the droplet trapping device when the opening is opened. FIG. 4 is a cross-sectional view of the droplet capturing device when the opening is closed. As shown in FIG. 1, the droplet capturing device 1 captures a gas-liquid two-phase flow droplet L <b> 1 that circulates in the tube group 5. Here, prior to the description of the droplet trapping apparatus 1, the tube group 5 in which the droplet trapping apparatus 1 is disposed will be described with reference to FIG.

  As shown in FIGS. 1 and 2, the droplet capturing device 1 is provided in a casing 10 in which a plurality of tubes 8 constituting a tube group 5 are arranged. The tube group 5 simulates, for example, a heat transfer tube group provided inside a pressure generator of a pressurized water reactor. The plurality of tubes 8 are formed to have the same diameter, are arranged so that their axial directions are parallel, and have a staggered arrangement (so-called triangular arrangement). In the internal space D of the casing 10 in which the tube group 5 is disposed, a gas-liquid two-phase flow that becomes an annular spray flow is directed from one side (lower side in the figure) to the other side (upper side in the figure) of the internal space D. Flowing. The annular spray flow is a state in which the ratio of the gas phase is larger than that of the liquid phase and the gas phase continues in the internal space D, while the liquid phase exists as droplets L1 or a liquid film L2.

  When the gas-liquid two-phase flow, which is an annular spray flow, flows through the internal space D in which the tube group 5 is disposed, the liquid phase becomes a droplet L1 that is partly formed in the internal space D, and the other part. Becomes the liquid film L2 formed on the outer peripheral surface of the tube 8.

  The droplet capturing device 1 captures a droplet L1 flowing through the tube group 5, a capturing member 15, an outer tube 16, a shutter tube (shutter member) 17, and a holding rod (holding member) 18. And a ball valve 19.

  The capturing member 15 is formed of a gel-like member, and is configured using, for example, grease or silicone. For this reason, the capturing member 15 is configured to be depressed when the droplet L1 hits, and the droplet diameter and number (droplet diameter distribution) of the captured droplet L1 can be measured.

  The outer tube 16 is one of the plurality of tubes 8 in the tube group 5, and is formed in a cylindrical shape having the same diameter as the other tubes 8. The outer tube 16 is disposed through the casing 10. In other words, one end (right side in the figure) of the outer tube 16 is a protruding portion that protrudes outside the casing 10, and the other end (left side in the figure) is in contact with the inside of the casing 10. It is a contact part. The protruding portion of the outer tube 16 is fixed to the outer surface of the casing 10 via a fixing member 31. The contact portion of the outer tube 16 is provided with a closing member 32 that contacts the casing 10. The closing member 32 closes the communication between the inside and the outside of the outer tube 16. The outer tube 16 accommodates the capturing member 15 therein. An opening 21 is formed in the outer tube 16 so as to face the capturing member 15 accommodated therein. The opening 21 is formed in a rectangular shape whose longitudinal direction is the axial direction.

  The holding rod 18 is a cylindrical rod inserted into the outer tube 16 and holds the capture member 15 on the distal end side in the insertion direction of the outer tube 16. The holding rod 18 has an outer diameter smaller than the inner diameter of the outer tube 16. The holding rod 18 holds the capturing member 15 such that the capturing member 15 faces the opening 21 of the outer cylindrical tube 16 by abutting the tip of the holding rod 18 against the closing member 32 of the outer cylindrical tube 16.

  The shutter tube 17 is provided between the inner side of the outer tube 16 and the outer side of the holding rod 18 and is formed in a cylindrical shape. The length of the shutter tube 17 in the axial direction is substantially the same as that of the outer tube 16. For this reason, the other end (right side in the drawing) of the shutter tube 17 protrudes outside the casing 10. The shutter tube 17 opens and closes the opening 21 of the outer tube 16. A shutter opening 34 smaller than the opening 21 of the outer tube 16 is formed in the shutter tube 17. The shutter opening 34 is formed in the shutter tube 17 so as to be positioned inside the opening 21 of the outer tube 16 in the axial direction. The shutter tube 17 is rotatable about the axis. Then, by rotating the shutter tube 17, the shutter opening 34 is opposed to the opening 21 of the outer tube 16 and the opening 21 is opened (see FIG. 3), or a portion other than the shutter opening 34 is disposed on the outer tube 16. The opening 21 is closed against the opening 21 (see FIG. 4).

  An operation member 35 for manually rotating the shutter tube 17 is attached to the shutter tube 17. The operation member 35 is fixed to the outer peripheral surface of the shutter tube 17 so as to protrude in the radial direction of the shutter tube 17. The operation member 35 has an open position where the opening 21 and the shutter opening 34 face each other, and a closed position where the opening 21 and the shutter opening 34 do not face each other (that is, parts other than the opening 21 and the shutter opening 34 face each other). Is rotated between The shutter tube 17 has a restricting member 36 fixed to the fixing member 31 so as to restrict the axial position of the shutter tube 17. The restricting member 36 is provided with the operation member 35 interposed between the fixing member 31 and the shutter by restricting the movement of the operation member 35 in the axial direction while allowing the operation member 35 to rotate. The position of the tube 17 in the axial direction is restricted.

  The ball valve 19 is connected to the protruding portion side of the outer tube 16. The ball valve 19 opens and closes communication between the inside and the outside of the outer tube 16. In the ball valve 19, the holding rod 18 is inserted in the open state. On the other hand, the ball valve 19 is closed when the holding rod 18 is pulled out.

  Next, with reference to FIG. 5, a series of operations for capturing droplets by the droplet capturing apparatus 1 will be described. FIG. 5 is a schematic configuration diagram of the droplet trapping device when the holding rod is pulled out. First, as shown in FIG. 5, the droplet trapping device 1 is in a state in which the holding rod 18 is pulled out from the outer tube 16 and the shutter tube 17. In this state, the ball valve 19 is in a closed state, and the operation member 35 of the shutter tube 17 is in a state of being rotated to the closed position.

  From this state, the ball valve 19 is opened, and the holding rod 18 that holds the capture member 15 at the distal end in the insertion direction is inserted into the outer tube 16 through the ball valve 19. As shown in FIG. 1, the inserted holding rod 18 is abutted against the closing member 32 that is the bottom of the outer tube 16, and in this state, is held by the opening 21 of the outer tube 16 and the holding rod 18. The holding rod 18 is rotated with respect to the outer tube 16 so that the capturing member 15 is opposed to the outer tube 16.

  When the opening 21 and the capturing member 15 face each other, the operation member 35 is rotated from the closed position to the open position. When the operation member 35 is in the open position, the shutter opening 34 of the shutter tube 17 faces the opening 21 of the outer tube 16 as shown in FIG. For this reason, the opening 21 of the outer tube 16 is in an open state, and the capturing member 15 is in a state in which the droplet L1 flowing in the tube group 5 can be captured.

  When a predetermined unit time elapses after the operating member 35 is located at the open position, the operating member 35 is rotated from the open position toward the closed position. When the operation member 35 is in the closed position, the shutter opening 34 of the shutter tube 17 moves to a position that does not face the opening 21 of the outer tube 16 as shown in FIG. For this reason, the opening 21 of the outer tube 16 is closed, and the capturing member 15 is unable to capture the liquid droplet L1 flowing through the tube group 5.

  Thereafter, the holding rod 18 is pulled out from the outer tube 16 through the ball valve 19. When the holding rod 18 is pulled out, the ball valve 19 is closed. Then, using a separately prepared measuring device, the droplet diameter and number (droplet diameter distribution) of the droplet L1 captured by the capturing member 15 are measured.

  As described above, according to the configuration of the present embodiment, the droplets can be captured by the capturing member 15 by opening and closing the opening 21 of the outer tube 16 by the shutter tube 17. Thereafter, the capturing member 15 is taken out and the captured droplet L1 is directly measured, whereby the droplet diameter and the number (droplet diameter distribution) of the droplet L1 can be measured with higher accuracy.

  Further, according to the configuration of this embodiment, the opening 21 of the outer tube 16 can be easily opened and closed by rotating the shutter tube 17. Further, the capture member 15 can be easily housed and taken out by inserting and removing the holding rod 18 with respect to the outer tube 16.

  Also, according to the configuration of the present embodiment, the shutter tube 17 can be rotated by operating the operation member 35, so that the opening / closing operation of the opening 21 can be performed manually.

  Moreover, according to the structure of a present Example, since the capture | acquisition member can be comprised with a gel-like member, the droplet L1 can be capture | acquired suitably by the part which the droplet L1 hit | dented hollows. .

  The droplet trapping device 1 may be a modified example shown in FIG. FIG. 6 is a schematic configuration diagram of a droplet capturing device according to a modification. The droplet capturing device 1 according to the modification includes an inner seal member 41 provided between the holding rod 18 and the shutter tube 17 and an outer seal member 42 provided between the shutter tube 17 and the outer tube 16. I have. The inner seal member 41 is provided at a position where the casing 10 is located in the axial direction of the holding rod 18 abutted against the closing member 32, and between the outer peripheral surface of the holding rod 18 and the inner peripheral surface of the shutter tube 17. Is provided. The inner seal member 41 hermetically seals between the holding rod 18 and the shutter tube 17. The inner seal member 41 is configured by, for example, an O-ring or an annular rubber packing. The outer seal member (seal member) 42 is provided at a position where the casing 10 is located in the axial direction of the shutter tube 17, and is provided between the outer peripheral surface of the shutter tube 17 and the inner peripheral surface of the outer tube 16. Yes. At this time, the inner seal member 41 and the outer seal member 42 may be at the same position in the axial direction. The outer seal member 42 hermetically seals between the shutter tube 17 and the outer tube 16. The outer seal member 42 is also composed of, for example, an O-ring or an annular rubber packing.

  As described above, according to the configuration of the modified example, the outer seal member 42 can hermetically seal the space between the outer tube 16 and the shutter tube 17, so that the state in the tube group 5 is, for example, Even under severe conditions such as a pressurized state, a negative pressure state, a high temperature state, and a low temperature state, it is possible to capture droplets. At this time, since the inner space between the shutter tube 17 and the holding rod 18 can be hermetically sealed by the inner seal member 41, the liquid droplets are more suitably used even in a severe environment in the tube group 5. It becomes possible to capture.

DESCRIPTION OF SYMBOLS 1 Droplet capture device 5 Tube group 8 Tube 10 Casing 15 Capture member 16 Outer cylinder tube 17 Shutter tube 18 Holding rod 19 Ball valve 21 Opening 31 Fixing member 32 Closure member 34 Shutter opening 35 Operation member 36 Restriction member 41 Inner seal member 42 Outer seal member D Internal space L1 Droplet L2 Liquid film

Claims (5)

A capture member for capturing droplets flowing through the tube group;
An outer tube that accommodates the capture member therein and has an opening facing the capture member;
And a shutter member capable of opening and closing the opening. A holding member that holds the capturing member and has a cylindrical outer shape that is inserted into the outer tube,
The shutter member is formed in a cylindrical shape and provided between the outer tube and the holding member, and a shutter opening that can be opposed to the opening is formed.
2. The opening according to claim 1, wherein the opening is opened by facing the shutter opening by rotation of the shutter member, and is closed by facing a portion other than the shutter opening. Droplet trapping device.   The droplet capturing apparatus according to claim 2, further comprising an operation member that is fixed to the shutter member and that protrudes outward from the shutter member in a radial direction.   The droplet capturing apparatus according to claim 1, wherein the capturing member is a gel-like member.   The droplet capturing apparatus according to claim 1, further comprising a seal member that hermetically seals between the outer tube and the shutter member.

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