CN116066657A - Compliant tube seal end cap and method of installation - Google Patents

Abstract

The invention provides a compliant pipe sealing end cover and an installation method related to the technical field of underwater acoustic engineering, comprising an end cover, a limit step, a positioning screw hole and a sealing groove, the end cover is connected with the limit step, and the end cover is respectively provided with There are positioning screw holes and sealing grooves; the end cover is matched with the inner cavity of the compliant tube, the limit step is in contact with the end of the compliant tube, and the end cover is fixed in the inner cavity of the compliant tube through the positioning screw hole. The sealing structure designed by the present invention adopts mature sealing ring technology for sealing, and a limited step and a positioning screw hole are designed on the sealing end cover, which can achieve a reliable sealing effect under high hydrostatic pressure; Flexible size design, with the advantages of wide applicability, high reliability, and strong practicability; the detachable structure can intuitively observe whether there is water seepage in the inner cavity of the compliant tube, and can realize non-destructive testing of the compliant tube; pass through the compliant tube Tolerance fit, there is no deformation problem.

Description

Compliant pipe sealing end cover and installation method

technical field

The invention relates to the technical field of underwater acoustic engineering, in particular to a sealing end cover of a compliance pipe and an installation method.

Background technique

In the field of underwater acoustic engineering technology, for the needs of target detection or underwater acoustic countermeasures, the demand for high-performance deep-water pressure-resistant transducers is becoming more and more urgent. A common method to improve the pressure resistance of the transducer is to increase the structural strength of the transducer itself, but this may lead to changes in the performance of the transducer. A more effective method is to design the overflow structure so that the internal cavity of the transducer communicates with the external water area to achieve internal and external pressure balance, thereby greatly improving the pressure resistance of the transducer. However, due to the existence of a liquid cavity inside the transducer, it will Bring about the loss of the sound source level of the transducer. In order to solve this problem, it was proposed to fill the transducer with a compliance tube to reduce the radiation resistance and the sound source level loss by changing the equivalent impedance of the liquid cavity in the transducer.

Patent document CN201467422U (Application No.: 200920087495.0) discloses a method for applying a compliance tube to a double-sided longitudinal vibration deep-water emission transducer. A double-sided symmetrical longitudinal vibration transducer is installed in an acoustically rigid cylindrical shell, which is filled with fluid, which communicates with the surrounding fluid through the communication tube on the side of the cylinder to achieve internal and external pressure balance. The acoustic performance of the liquid chamber in the transducer is adjusted through the compliance tube, the maximum sound source level in the 200Hz-800Hz frequency band is greater than 190dB, and the working depth is greater than 1000 meters.

The cross-section of the compliant tube is generally a flat oval structure, which is stretched axially to form a flat cylindrical tube. By changing the structural parameters and materials of the compliance pipe, it can adapt to different working water depths. In engineering applications, in order to adapt to the deep water working environment, it is necessary to carry out reliable watertight design on the end face of the compliant pipe. According to relevant application examples, the sealing of the compliant pipe generally involves welding the end cap and the compliant pipe to achieve a watertight effect. The advantage of adopting this method is that the structure is simple, and the watertightness of the compliant pipe can be realized without complicated structures. The disadvantages are also obvious. Due to the need to work under high hydrostatic pressure, there are high requirements for welding quality. If the high temperature generated by welding causes deformation of the compliant tube, it will affect the performance of the compliant tube; the welding quality is affected by the type of material to be welded For example, the welding effect of commonly used stainless steel materials is significantly better than that of aluminum alloy materials, which will greatly limit the selection range of compliant tube materials; once the compliant tube is damaged, it is necessary to detect whether there is water seepage inside, and it is necessary to check the Cutting is performed for destructive inspection of compliant tubing. In addition, the size of the compliance tube needs to be adapted to transducers of different sizes, and when the size of the compliance tube is small or too large, it will also bring difficulties to the sealing of the compliance tube. All these will affect the reliability and applicability of the seal, so it is necessary to conduct in-depth research on the watertightness of the compliant pipe.

Contents of the invention

Aiming at the defects in the prior art, the object of the present invention is to provide a sealing end cover of a compliant tube and an installation method.

According to the present invention, a sealing end cap of a compliant tube comprises an end cap, a limiting step, a positioning screw hole and a sealing groove, the end cap is connected to the limiting step, and the end cap is respectively provided with a positioning screw hole and a sealing groove;

The end cap is in tolerance fit with the inner cavity of the compliant tube, the limit step is in contact with the end of the compliant tube, and the end cover is fixed in the inner cavity of the compliant tube through the positioning screw hole.

Preferably, the size of the limiting step is larger than the size of the end cap.

Preferably, the positioning screw hole is located between the limiting step and the sealing groove.

Preferably, the end cap includes a first section, a second section and a third section, the first section is connected to the third section through the second section, and the third section is connected to the limiting step.

Preferably, a circle of chamfers is provided on the top of the first section.

Preferably, a sealing groove is provided on the second section.

Preferably, the surfaces of the sealing groove and the lumen of the compliance tube are coated with vacuum silicone grease.

Preferably, positioning screw holes are provided on the third section.

Preferably, the number of positioning screw holes is one.

The present invention also provides a method for installing the sealing end cap of the compliance tube, which includes the following steps:

S1. Apply vacuum silicone grease to the surface of the sealing groove and the inner cavity of the compliance tube;

S2. Push the end cap into the inner cavity of the compliant tube, so that the limit step is in full contact with the end surface of the compliant tube;

S3. Screw the screws into the positioning screw holes respectively to fix the sealing end cap.

Compared with the prior art, the present invention has the following beneficial effects:

(1) The sealing structure designed by the present invention adopts mature sealing ring technology for sealing, and a limited step and a positioning screw hole are designed on the sealing end cover, which can achieve a reliable sealing effect under high hydrostatic pressure; and the sealing end cover is based on different The size of the compliance tube is flexibly designed, which has the advantages of wide applicability, high reliability and strong practicability;

(2) The sealing end cap of the compliant tube designed by the present invention is a detachable structure, which can visually observe whether there is water seepage in the inner cavity of the compliant tube, and can realize non-destructive testing of the compliant tube;

(3) The size of the sealing end cover of the compliant tube designed by the present invention is much smaller than the axial dimension of the compliant tube, and it fits with the compliant tube through a tolerance, and there is no deformation problem; compared with the prior art, this The sealing method basically has no effect on the acoustic performance of the compliant pipe.

Description of drawings

Other characteristics, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

Fig. 1 is a structural schematic diagram of the present invention.

Labels in the figure:

End cap 1, first section 11, second section 12, third section 13, limit step 2, positioning screw hole 3, sealing groove 4.

Detailed ways

The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

Example 1

According to the sealing end cap of a compliant tube provided by the present invention, its material is aluminum, steel or titanium alloy. Including end cover 1, limit step 2, positioning screw hole 3 and sealing groove 4, end cover 1 is connected with limit step 2, and the size of limit step 2 is larger than that of end cover 1, ensuring that the end cover cannot be squeezed in under high hydrostatic pressure cis duct lumen. The end cap 1 is respectively provided with a positioning screw hole 3 and a sealing groove 4, and the positioning screw hole 3 is located between the limit step 2 and the sealing groove 4, so as to ensure that the position of the end cap 1 is opposite to the compliance tube during the use of the compliance tube fixed. The tolerance of the end cap 1 and the lumen of the compliant tube is matched, and the size of the end cap 1 is much smaller than the axial dimension of the compliant tube. It is necessary to ensure smooth insertion into the inner cavity of the compliant tube and to ensure the sealing effect. The limiting step 2 is in contact with the end of the compliant tube, and the end cap 1 is fixed in the lumen of the compliant tube through the positioning screw hole 3 .

The end cap 1 includes a first section 11 , a second section 12 and a third section 13 , the first section 11 is connected to the third section 13 through the second section 12 , and the third section 13 is connected to the limiting step 2 . The top of the first section 11 is provided with a circle of chamfering; the second section 12 is provided with a sealing groove 4, and the surface of the sealing groove 4 and the inner cavity of the compliance tube are all coated with vacuum silicone grease; the third section 13 is provided with a positioning screw hole 3 for positioning The number of screw holes 3 is four.

Example 2

The present invention also provides a method for installing the sealing end cap of the compliance tube, which includes the following steps:

S1. Apply vacuum silicone grease to the surface of the sealing groove 4 and the inner cavity of the compliance tube;

S2. Push the end cap 1 into the inner cavity of the compliant tube, so that the limit step 2 is in full contact with the end surface of the compliant tube;

S3. Screw the screws into the positioning screw holes 3 respectively to fix the sealing end cap.

More specifically, put the compliant tube with the sealed end cap into the autoclave for hydrostatic pressure test. After holding the pressure for 2 hours under 6MPa hydrostatic pressure, take out the compliant tube, open the sealed end cap, and the compliant tube No water seepage occurs, indicating that the invention can solve the watertight problem of the compliant pipe under high hydrostatic pressure.

In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, rather than indicating or implying the referred device Or elements must have a certain orientation, be constructed and operate in a certain orientation, and thus should not be construed as limiting the application.

Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. In the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims (10)

1. A sealing end cap for a compliant pipe, characterized in that it comprises an end cap (1), a limiting step (2), a positioning screw hole (3) and a sealing groove (4), and the end cap (1) is connected to The limiting step (2), the end cover (1) are respectively provided with the positioning screw hole (3) and the sealing groove (4); The end cap (1) is in tolerance fit with the inner cavity of the compliant tube, the limit step (2) is in contact with the end of the compliant tube, and the end cap (1) is fixed on the compliant tube through the positioning screw hole (3). in the lumen of the sex tube. 2. The sealing end cap of the compliant tube according to claim 1, characterized in that, the size of the limiting step (2) is larger than the size of the end cap (1). 3. The sealing end cap of the compliant tube according to claim 1, characterized in that, the positioning screw hole (3) is located between the limiting step (2) and the sealing groove (4). 4. The sealing end cap of the compliant tube according to claim 1, characterized in that, the end cap (1) comprises a first section (11), a second section (12) and a third section (13), the The first section (11) is connected to the third section (13) through the second section (12), and the third section (13) is connected to the limiting step (2). 5. The sealing end cap of the compliant tube according to claim 4, characterized in that, a circle of chamfers is provided on the top of the first section (11). 6. The sealing end cap of the compliant tube according to claim 4, characterized in that, the second section (12) is provided with a sealing groove (4). 7. The sealing end cap of the compliant tube according to claim 6, characterized in that vacuum silicone grease is applied to the surface of the sealing groove (4) and the inner cavity of the compliant tube. 8. The sealing end cap of the compliant tube according to claim 4, characterized in that, the positioning screw hole (3) is provided on the third section (13). 9. The sealing end cap of the compliant tube according to claim 8, characterized in that, the number of the positioning screw holes (3) is four. 10. A method for installing the sealing end cap of a compliant tube according to any one of claims 1-9, characterized in that it comprises the following steps: S1, apply vacuum silicone grease to the surfaces of the sealing groove (4) and the lumen of the compliance tube; S2. Push the end cap (1) into the inner cavity of the compliant tube, so that the limiting step (2) is in full contact with the end surface of the compliant tube; S3. Screw the screws into the positioning screw holes (3) respectively to fix the sealing end cap.

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