JPH0793173B2 - Protective tube structure for connection device in liquid - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a protective tube structure of a liquid connecting device capable of making an electrical connection in a liquid without being affected by a surrounding liquid. .

[Conventional technology]

Generally, for signal transmission in sodium in fast breeder reactors, in water in light water reactors and in various liquids such as chemical plants, the connector used in the path for transmitting electrical signals, fluid pressure signals, etc., is not affected by surrounding liquid. It is necessary to put on and take off.

Regarding the connection / disconnection of the connector in the liquid, the present applicant has already filed as Japanese Patent Application No. 61-282658.

FIG. 4 is a diagram for explaining the basic principle of such a connector. 1 is an instep connector, 2 is a protrusion, 3 is a protective tube, 4 is a measuring wire, 5 is a B connector, 6 is a destruction plate, and 7 is a signal. Source, 8
Is a measuring wire, and 9 is liquid sodium.

In FIG. 4 (a), liquid sodium 9 on the signal source 7 side
The inner B connector 5 is covered with a destruction plate 6 to keep it in a hermetically sealed state, while the gas is pressure-fed to form a protective space 3 in which a gas space is formed.
The protection tube 3 is gradually lowered while the measurement side instep connector 1 is accommodated therein, and as a result, as shown in FIG. 4 (b), the second connector 5 is exposed to the gas space, and the protrusion 2 of the instep connector 1 It is possible to break the breaker plate 6 and connect them without being affected by the surrounding liquid, and similarly disconnect the connection in the gas space to pull up the instep connector 1.

FIG. 5 is a diagram showing a specific example of the invention related to the above-mentioned application, and the same numbers as in FIG. 4 indicate the same contents. In the figure, 10 is a fuel assembly for irradiation, 13 and 14 are sealing surfaces, 15 is a claw, 16 is a tapered surface, 17 is an inclined projection portion, 18 is a fitting portion, 30 and 38 are motors,
31 and 32 are gears, 39 is a ball screw, 43 is a gas supply pipe, 91 is a gas collecting cylinder, and 92 is a gas discharge hole.

In the figure, the protective tube 3 is moved up and down by the motor 30 via the gears 31 and 32, and the instep connector 1 is connected to the motor 38 in the protective tube 3.
It is possible to move up and down via the ball screw 39. Gas is supplied from the gas supply pipe 43 into the protective pipe 3 to form a gas space. From the state where the head of the second connector 5 is exposed to the gas space and the liquid sodium 9 is still present in the head of the irradiation fuel assembly 10, the motor 30 is further driven to lower the protection tube 3. Then, when the gas space is expanded, the second connector is completely exposed in the gas space, and in this state, the motor 38 is driven to lower the instep connector 1 and the projection 2 at the tip thereof breaks the destruction plate 6. . In this way, the connection end 11 of the instep connector 1 and the connection end 12 of the second connector 5 are fitted in the gas space to establish a connection. Then, the protection tube 3 is lifted to release the contact state between the inclined projection 17 and the tapered surface 16 and close the claw 15. Then, the claw 15 is caught by the fitting part 18 of the sealing surface of the second connector 5 and both sides are closed. The connector is fixed, the protection tube 3 is further raised, and the instep connector is relatively driven so as to be lowered, and a crimping force is forcibly applied to the sealing surfaces 13 and 14 of both connectors. Further, when disconnecting both connectors, the instep connector 1 is moved up and the protection tube 3 is driven relatively downward so that the inclined projection 17 comes into contact with the tapered surface 16 to forcibly open the claw 15. The fitting between the fitting portion 18 and the claw 15 can be removed.

Here, the gas collecting cylinder 91 provided outside the protection tube 3 collects the gas that overflows from the lower end of the protection tube 3 and floats in the liquid sodium 9, and the gas discharge hole 92 in the upper portion collects the gas. It is for discharging into the cover gas space, and bubbles from the lower end of the protective tube 3 are prevented from being mixed with the circulating liquid sodium and adversely affecting the pump and other fuel assemblies.

[Problems to be solved by the invention]

By the way, if the gas overflowing from the protection tube 3 is mixed into the liquid sodium and circulates in the fast breeder reactor, cavitation may be induced in the primary main circulation pump. When passing through the assembly, the nuclear properties are adversely affected, and further, if it adheres to the fuel assembly, it has an unfavorable effect.

Therefore, the larger the lower end area of the gas collecting cylinder 91 that collects the gas overflowing from the tip of the protection tube 3, the larger the diameter of the overflow gas that can be completely recovered, so that the diameter of the reactor must be increased. It will hinder the layout design.

The present invention is to solve such a problem, and provides a protective tube structure of a liquid connecting device capable of collecting gas overflowing from the tip of the protective tube without increasing the diameter of the gas collecting cylinder. The purpose is to do.

[Means for Solving the Problems]

Therefore, the present invention, by pressure-feeding the gas in the protective tube of the lower end opened housing one connector to fill, to form a gas space inside the liquid, by immersing the protective tube in the liquid, In the in-liquid connecting device in which the other connector in the liquid is exposed in the gas space to connect the two connectors, a fine bubble-forming portion is formed at the tip of the protection tube.

[Action]

According to the present invention, one connector having a protrusion at the tip is housed in a protective tube provided with a breathable porous fine bubble-forming section or a large number of fine bubble-forming notches around the open lower end, and the protective tube is filled with gas. The gas that overflows when it is made into fine bubbles by the fine bubble forming section and collected by the gas collecting cylinder, and lowers the one connector while forming a gas space inside the protective tube in the liquid,
Normally, it is in liquid, and the other connector having a breaking plate at the upper end is exposed in the gas space, and the breaking plate is broken at the tip of the one connector to connect both connectors, so that the influence of surrounding liquid is exerted. The connection in the liquid is possible without being subjected to the stress.

〔Example〕

Hereinafter, embodiments will be described with reference to the drawings. Since the basic principle of the present invention and the connection / disconnection method are the same as those of the invention of the above-mentioned application, description thereof will be omitted.

FIG. 1 is a diagram showing an embodiment of a protective tube structure in a liquid connecting device according to the present invention, and the same numbers as in FIG. 5 indicate the same contents. 20 is a comb tooth, 100 is a fine bubble portion, and 101 is a fine bubble portion.

In FIG. 1, a fine bubble-generating section 100 made of a wire mesh or a ceramic porous material is attached to the tip of the protective tube 3. When connecting the instep connector explained in FIG. 4 and FIG. 5 to the B connector, a filling gas is passed from the tip of the protective tube 3 through the fine bubble forming section 100 so that the liquid level of the liquid sodium in the protective tube 3 does not rise. The bubbles become smaller when overflowing little by little,
Therefore, the spread of bubbles in the lateral direction is also reduced. If the bubble is made smaller in this way, the bubble rises along the outer wall of the protective tube 3, so that the diameter of the gas collecting cylinder 91 (FIG. 5) for collecting the bubble can be made smaller.

FIG. 2 is a view showing another embodiment of the present invention in which a large number of fine bubble-forming notches 101 are provided around the tip of the protective tube 3.

In the present embodiment, the bubbles are dispersed from the peripheral edge of the protective tube 3 by the fine bubble-dividing notch 101, become smaller, and are then discharged.

FIG. 3 is a view showing another embodiment of the present invention in which the comb teeth provided at the tip of the protective tube 3 are provided with a fine bubble-forming portion.

In this embodiment, a breathable porous bubble-generating unit 100 is attached to the root of the comb teeth 20 provided at the tip of the protective tube 3 so as to bubble the overflowing gas.

〔The invention's effect〕

As described above, according to the present invention, the overflow gas can be prevented by providing a breathable porous fine bubble-forming portion or a large number of fine bubble-forming notches at the tip of the protective tube. It becomes possible to make the bubbles finer and reduce the lateral spread to further reduce the size of the overflow gas collecting cylinder.

Therefore, a compact layout design of the reactor becomes possible, and by properly designing the diameter of the gas collection cylinder, it is possible to prevent cavitation damage of the primary main circulation pump, change of nuclear characteristics and fuel melting. Become.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a protective tube structure of a liquid connecting device according to the present invention, FIGS. 2 and 3 are diagrams showing other embodiments of the present invention, and FIG. 4 is a liquid connecting device. FIG. 5 is a diagram for explaining the basic principle of the device, and FIG. 5 is a cross-sectional view of the in-liquid connecting device. 1 ... Instep connector, 2 ... Protrusion, 3 ... Protection tube, 4, 8
...... Measurement electric wire, 5 ...... B connector, 6 ...... breakdown plate, 7
…… Signal source, 9 …… Liquid sodium, 10 …… Fuel assembly for irradiation, 13,14 …… Seal surface, 15 …… Claw, 16 …… Tapered surface, 17 …… Inclined protrusion, 18 …… Fit Abe, 20 …… comb teeth, 3
0, 38 …… Motor, 91 …… Gas collection cylinder, 92 …… Gas release hole, 100 …… Fine bubble making part, 101 …… Fine bubble making step.

Claims (4)

[Claims] Claim: What is claimed is: 1. A liquid is obtained by pumping and filling gas into a protective tube having one open end, which is open at the lower end, to form a gas space inside the liquid, and submerging the protective tube into the liquid. In a liquid connecting device in which the other connector of the inside is exposed in the gas space to connect both connectors, a protection device for liquid connecting device is characterized in that a fine bubble forming part is formed at a tip portion of the protection tube. Tube structure. 2. The protective tube structure according to claim 1, wherein the fine bubble portion is a member made of a gas permeable porous material. 3. The protective tube structure according to claim 1, wherein the bubble-reducing portion has fine irregularities. 4. The protective tube structure according to claim 1, wherein the finely foamed portion has a comb tooth portion provided with a member made of a breathable porous material.