CN1588727A - Underwater conical extruding leading line sealing method - Google Patents

Abstract

The invention discloses a sealing method for conical extruding lead wires for underwater use, which comprises the following preparation and installation steps: setting an air nozzle with a conical inner cavity on the sealing body, and making a soft soft material matching the inner cavity of the air nozzle. Plugging, open a wire hole on the soft plug to connect the inner cavity of the seal with the outside world, lead the wire through the wire hole to the outside, and install an extrusion device on the valve to squeeze the soft plug. The pressure device compresses and fixes the soft plug in the conical cavity of the air nozzle. This method can make the relevant gap (such as the gap between the wire sheath and the plug) be squeezed and compacted to achieve a good sealing effect, and is especially suitable for the wire with relatively high hardness.

Description

A kind of sealing method of tapered extruded lead wire for underwater use

technical field

The invention relates to a lead wire sealing method, in particular to an underwater tapered extrusion lead wire sealing method.

Background technique

Whether it is scientific research or practical engineering, the sealing protection of the external leads of the underwater sealing body has always been difficult to be well resolved, especially in the case of deep water high pressure or dynamic load, once the lead part fails, the entire seal will fail, such as As shown in Figure 1, when performing long-term measurement, various sensors 4 need to be placed in a sealing body 1 for sealing protection. The wire 3 of the sensor 4 passes through the sealing body and connects with the external receiving device, because it is difficult for the wire to directly connect with the sealing body. body to achieve sealing, so it is necessary to set a lead device 2 between the wire and the sealing body to achieve sealing, so as to ensure the overall sealing effect and ensure the accuracy of the measurement. If the lead device 2 is used, there are two parts that need to be sealed. One is The sealing problem between the sealing body 1 and the lead device 2, if this part fails, the overall sealing of the sealing body will fail. Another difficulty is the seal between the wire 3 and the lead device 2. If this part fails, the overall seal may fail. It is also possible to cause local failure of the lead due to local contact with water. How to solve the above sealing problem has become a difficult problem for engineers and technicians.

Contents of the invention

Aiming at the problems existing in the prior art, the object of the present invention is to provide an underwater tapered extrusion lead wire sealing method which can effectively seal between the lead wire and the lead wire device.

In order to achieve the above object, the present invention includes the following preparation and installation steps: a gas nozzle with a tapered inner cavity is arranged on the sealing body, a soft plug matching the inner cavity of the gas nozzle is made, and a soft plug is opened on the soft plug. The wire hole that connects the inner cavity of the seal with the outside world, the wire is drawn out through the wire hole, and the extrusion device for extruding the soft plug is installed on the air nozzle, and the soft plug is pressed and fixed by the extrusion device In the conical cavity of the valve.

Further, the soft plug is made of rubber material.

Further, the wire hole is a linear hole penetrating through the soft plug.

Further, the diameter of the wire hole is slightly smaller than the diameter of the wire.

Further, the extruding device includes a pressing plate with a support arm located above the soft plug, a wire hole is opened on the pressing plate, a sliding groove is opened on the side wall of the top end of the air nozzle corresponding to the support arm of the pressing plate, and the air A push nut is arranged on the top of the mouth, and the pressure plate compresses and fixes the soft plug in the tapered inner cavity of the gas nozzle under the action of the push nut.

Further, the extruding device includes a pressing plate with a wire hole, the size of the pressing plate matches the inner cavity of the air nozzle, a push nut is provided on the top of the air nozzle, and a thimble is arranged on the pushing nut, and the push nut pushes the soft material through the thimble and the pressing plate. The plug is compressed and fixed in the conical inner cavity of the gas nozzle.

Further, the wire holes on the pressing plate and the wire holes on the soft plug are staggered from each other.

This method makes the wire pass through the tapered plug and then compacts the tapered plug into the tapered cavity of the air nozzle, so that the relevant gap (such as the gap between the wire sheath and the plug) can be squeezed and compacted to achieve a good seal It is especially suitable for wires with relatively high hardness. If there is a gap between the wire core and the wire sheath, in order to avoid being squeezed tightly, water-based quick gel (such as 502) can be injected into the wire core.

Description of drawings

Fig. 1 is a structural schematic diagram of leading wires from a sealed cavity;

Fig. 2 is a schematic structural view of the pressing plate in the first embodiment;

Fig. 3 is a structural schematic diagram of a soft plug;

Fig. 4 is a structural schematic diagram of sealing according to the first embodiment of the method;

Fig. 5 is the A direction view of Fig. 4;

Fig. 6 is a structural schematic diagram of sealing according to the second embodiment of the method;

FIG. 7 is a schematic structural diagram of sealing according to a third embodiment of the method.

Detailed ways:

In the first embodiment shown in Figure 4 and Figure 5, an air nozzle 9 is installed on the body wall 5 of the sealing body according to the prior art. The ring 10 seals and fixes the air nozzle 9 and the body wall 5, and the lower half of the inner cavity of the air nozzle 9 is conical. After the air nozzle 9 is installed, the wire 11 is drawn out and tightened through the rubber plug 12; As shown in Figure 3, the shape of the rubber plug 12 is adapted to the tapered part of the inner cavity of the air nozzle 9, and there are linear wire holes 14 running through the two ends of the plug 12. The diameter of the wire hole 14 is slightly smaller than that of the wire 11. The diameter of the plug 12 is consistent with the taper angle of the conical cavity. After the rubber plug 12 falls into the conical cavity by its own gravity, a part of the conical cavity will be exposed to provide for the following process. Sufficient pushing margin is better to achieve sealing. After the rubber plug 12 is set, cover the top of the plug 12 with a pressure plate 7 with a support arm 13. As shown in Figure 2, the pressure plate 7 is provided with Conductor hole 15, the top side wall of gas nozzle 9 is provided with the sliding groove that matches with support arm 13 on pressing plate 7, and support arm 13 can move freely up and down along the sliding groove, and the top of gas nozzle 9 is provided with push nut 8, pushes The nut 8 compresses and fixes the rubber plug 12 in the conical inner cavity of the air nozzle 9 through the pressure plate 7. The purpose of setting the support arm on the pressure plate is to prevent the relative rotation between the pressure plate 7 and the rubber plug 12 during the advancement of the nut 8. , creating internal shear forces that eventually lead to seal failure.

In the second embodiment shown in Figure 6, the settings of the gas nozzle and the plug are the same as those of the first embodiment, the difference is that the pushing and extruding device, the size of the pressing plate 23 matches the cylindrical inner cavity of the gas nozzle, There is a wire hole on it, a push nut 21 is provided on the top of the air nozzle, and a thimble 22 is provided at the center of the push nut 21. Corresponding to the thimble 22, a thimble groove is set on the pressure plate 23, so that the pressure plate 23 It is not easy to produce relative rotation with the plug to affect the sealing.

In order to make the sealing more effective, the method shown in Figure 7 can also be used, the wire holes 31 on the pressure plate and the wire holes 32 on the soft plug are staggered by a certain distance, which can be radially staggered during processing or installed. Rotate a certain angle to achieve misalignment, so that a part of the wire is located between the pressing plate and the bonding surface of the soft plug, which can be effectively compressed during the pushing process, and the two bends formed at the same time also improve the sealing performance. Further improve.

Certainly, this method is not limited to the above-mentioned embodiment, and anyone can draw other various forms of deformation under the inspiration of the present invention, for example, the pushing and extruding device can also select other feeding mechanisms, but regardless of its process or structure Any changes are made above, and any method that utilizes an extrusion tapered plug to realize the sealing of the wire and the lead wire device all falls within the protection scope of the present invention.

Claims (7)

1, a kind ofly uses tapered swaged lead encapsulating method under water, comprise and being prepared as follows and installation steps: a valve with conical internal cavity is set on seal, making one is stifled with the soft plug that the valve inner chamber matches, on soft plug is stifled, offer the wire guide that sealed body cavity is in communication with the outside, lead is passed wire guide outwards draws, the stifled pressurizing unit of the soft plug of extruding is set on valve, with this pressurizing unit soft plug is blocked up and be pressed abd fixed in the conical cavity of valve.

2, a kind of tapered swaged lead encapsulating method of using under water according to claim 1 is characterized in that, described soft plug is stifled to be made by elastomeric material.

3, a kind of tapered swaged lead encapsulating method of using under water according to claim 1 is characterized in that, described wire guide is to run through the stifled linear pattern hole of soft plug.

4, a kind of tapered swaged lead encapsulating method of using under water according to claim 1 is characterized in that the aperture of described wire guide is slightly less than the diameter of lead.

5, a kind of tapered swaged lead encapsulating method of using under water according to claim 1, it is characterized in that, described pressurizing unit comprises that one is positioned at the pressing plate that soft plug blocks up the top, has support arm, have wire guide on the pressing plate, on the sidewall of valve top therewith pressing plate support arm corresponding position have sliding tray, the valve top is provided with pushnut, and pressing plate is pressed abd fixed in the conical internal cavity of valve soft plug is stifled under the effect of pushnut.

6, a kind of tapered swaged lead encapsulating method of using under water according to claim 1, it is characterized in that, described pressurizing unit comprises that one has the pressing plate of wire guide, pressing plate size and valve inner chamber match, the valve top is provided with pushnut, pushnut is provided with thimble, and pushnut blocks up soft plug by thimble and pressing plate and is pressed abd fixed in the conical internal cavity of valve.

7, a kind of tapered swaged lead encapsulating method of using under water according to claim 1 is characterized in that, the wire guide on wire guide on the described pressing plate and soft plug are stifled staggers mutually.

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