A pressure-resistant sealing structure of a watertight penetration joint and a manufacturing method thereof

Abstract

The present invention discloses a pressure-resistant sealing structure and a manufacturing method of a watertight penetration joint. The technical solution is as follows: a pressure-resistant sealing structure of a watertight penetration joint comprises a penetration joint metal shell, a boss is integrally formed at one end of the penetration joint metal shell, an axial through hole is provided in the penetration joint metal shell, the axial through hole passes through the boss, a metal shell external thread is provided on the side wall of the penetration joint metal shell, a step groove is provided on the side wall of the axial through hole, the step groove is located at one end of the axial through hole through the boss, an epoxy resin sealant layer is filled in the axial through hole and the step groove, an elastic silicone rubber layer is provided at one end of the step groove away from the metal shell external thread, cables are passed through the elastic silicone rubber layer and the epoxy resin sealant layer, and the end face of the boss facing the penetration joint metal shell is a contact sealing surface. The present invention effectively avoids the high price and large volume of watertight connectors instead of penetration joints, solves the pressure-resistant sealing problem of underwater cable penetration, reduces the volume and reduces the cost.

Description

Technical Field

[0001] The invention relates to a watertight penetration hole joint, and in particular to a pressure-resistant sealing structure of the watertight penetration hole joint and a manufacturing method thereof. Background Art

[0002] In recent years, human exploration of underwater environments such as oceans, lakes and rivers has also increased the introduction of intelligent equipment, especially the water environment in the 0-1000 meter range has received widespread attention.

[0003] There are two basic characteristics of the underwater environment: one is the existence of water medium, and the other is that the underwater pressure increases with the increase of depth. Underwater intelligent equipment is one of the essential items for intelligent observation of underwater environment. Its energy and signal transmission must be based on cables, and the cables need to pass from the cabin of the equipment to the outside of the cabin. Therefore, the watertight penetration joint between the cable and the cabin is particularly important and necessary. In view of the special underwater use environment, the watertight penetration joint is not only required to be waterproof and sealed, but also needs to have a certain compressive mechanical strength to prevent damage to the watertight joint caused by changes in external pressure.

[0004] At present, most of the watertight penetration joints used in China are replaced by domestic or imported watertight connectors. Most of the watertight connectors realize signal connection transmission by plugging male and female heads.

[0005] The shallow water range of 0-1000 meters has lower requirements for pressure resistance than the range of 1500-6000 meters. However, watertight plug-ins are still used, and the existing watertight connectors are not only costly and bulky, but also have low thread universality.

[0006] Therefore, it is necessary for us to improve such a structure to overcome the above-mentioned defects. Summary of the invention

[0007] The purpose of the present invention is to provide a pressure-resistant sealing structure and a manufacturing method for a watertight penetration joint, so as to effectively avoid the limitations of high price and large size of watertight connectors instead of penetration joints, solve the pressure-resistant sealing problem of underwater cables penetrating the cabin, reduce the size and reduce the cost.

[0008] The above technical objectives of the present invention are achieved through the following technical solutions: a pressure-resistant sealing structure of a watertight penetration joint, comprising a penetration joint metal shell, a boss integrally formed at one end of the penetration joint metal shell, the boss protruding from the side wall of the penetration joint metal shell, an axial through hole is provided in the penetration joint metal shell, the axial through hole passes through the boss, the side wall of the penetration joint metal shell is provided with a metal shell external thread, and the side wall of the axial through hole is provided with a step groove, the step groove is located at one end of the axial through hole through the boss, the axial through hole and the step groove are filled with an epoxy resin sealant layer, and an elastic silicone rubber layer is provided at one end of the step groove away from the metal shell external thread, the elastic silicone rubber layer is in close contact with the epoxy resin sealant layer, and cables are passed through the elastic silicone rubber layer and the epoxy resin sealant layer, and the end surface of the boss facing the penetration joint metal shell is a contact sealing surface.

[0009] The present invention is further configured as follows: the axial through hole and the step groove side wall are provided with two radial limiting grooves, and the limiting grooves are arranged in an annular shape.

[0010] The present invention is further configured as follows: the contact sealing surface is provided with an O-shaped sealing groove, and the O-shaped sealing groove is arranged around the metal shell of the cabin penetration joint.

[0011] The present invention is further configured as follows: the side wall of the boss is provided with two cutting surfaces, and the two cutting surfaces are symmetrically arranged.

[0012] The present invention is further configured as follows: the metal shell of the penetration joint is made of aluminum alloy or stainless steel.

[0013] The present invention is further configured as follows: a method for manufacturing a pressure-resistant sealing structure of a watertight penetration joint, comprising the following steps: a first step: firstly, a penetration joint metal shell with an external thread is formed by machining, and a boss is integrally machined at one end of the penetration joint metal shell, two symmetrical side walls of the boss are cut to form a cutting surface, and an axial through hole and a step groove are provided in the penetration joint metal shell, an O-type sealing groove is provided on the contact sealing surface at the bottom of the boss, and two radial limiting grooves are respectively provided on the side walls of the axial through hole and the step groove;

[0014] Step 2: Clean the inside and outside of the metal shell of the penetration connector with alcohol. After the middle axial through hole is dry, apply a thin layer of adhesive on its inner wall, pass the cable through the axial through hole, and put a short section of heat shrink tube on the outer thread of the metal shell of the lower half of the penetration connector metal shell and heat-curing it;

[0015] Step 3: Fill the epoxy resin sealant from the top of the boss, leaving 10% of the depth. After the sealant is completely cured, fill it with elastic silicone rubber until it is flush with the upper end surface of the shell. Wait for the silicone rubber to cure and then set it aside.

[0016] Step 4: After the filled colloid is completely solidified, the external thread of the metal shell is matched and tightened with the internal thread of the opening of the underwater equipment's cabin to achieve sealing.

[0017] In summary, the present invention has the following beneficial effects:

[0018] The structure and pressure-resistant sealing method of the present application can avoid the limitations of high price and large size of watertight connectors instead of cabin penetration connectors, and solve the problem of pressure-resistant sealing of underwater cables penetrating cabins.

[0019] This application makes up for the lack of low-cost pressure-resistant watertight penetration joint products in shallow water environments, thereby effectively reducing manufacturing costs and reducing joint volume, and specific performance values ​​can be reduced or reduced by more than 50%.

[0020] The watertight penetration joint of the present application has good pressure-resistant sealing effect, reliable performance, simple manufacturing, and high universality of cables and joints. The penetration joint has been used for more than 60 times in a simulated hydrostatic pressure environment of 10Mpa (1000 meters underwater) without leakage or failure.

[0021] The penetration joint structure of the present application provides multiple limit protections for internal cables and colloids to prevent the cables and colloids from falling off due to dragging, thereby significantly improving the tensile performance of the penetration parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 It is a top view of the through-hull and boss, used to show the cutting surface.

[0024] The corresponding component names represented by the numbers in the figure are: 1. Metal shell of the cabin penetration joint; 2. O-ring sealing groove; 3. Axial through hole; 4. Cable; 5. Elastic silicone rubber layer; 6. Limiting groove; 7. Epoxy resin sealant layer; 8. Contact sealing surface; 9. External thread of the metal shell; 10. Cutting surface; 11. Boss; 12. Step groove. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with illustrations and specific embodiments.

[0026] Example 1: Figure 1 and Figure 2As shown, a pressure-resistant sealing structure of a watertight penetration joint proposed by the present invention includes a penetration joint metal shell 1, and the penetration joint metal shell 1 is made of aluminum alloy or stainless steel. A boss 11 protruding from the side wall of the penetration joint metal shell 1 is integrally formed at one end of the penetration joint metal shell 1, and the penetration joint metal shell 1 is provided with an axial through hole 3, and the axial through hole 3 passes through the boss 11. The side wall of the penetration joint metal shell 1 is provided with a metal shell external thread 9, and the side wall of the axial through hole 3 is provided with a step groove 12, and the step groove 12 is located at one end of the axial through hole 3 passing through the boss 11, and the axial through hole 3 and the step groove 12 are filled with an epoxy resin sealant layer 7, and the step groove 12 is filled with an epoxy resin sealant layer 7. An elastic silicone rubber layer 5 is provided at the end away from the external thread 9 of the metal shell. The elastic silicone rubber layer 5 is in close contact with the epoxy resin sealant layer 7. The thickness of the elastic silicone rubber layer 5 is 10% of the depth of the axial through hole 3. A cable 4 is passed through the elastic silicone rubber layer 5 and the epoxy resin sealant layer 7. The end face of the boss 11 facing the metal shell 1 of the penetration joint is a contact sealing surface 8. The contact sealing surface 8 contacts the outer side wall of the cabin of the underwater equipment, and an O-type sealing groove 2 for installing an O-ring of corresponding specifications is opened on the contact sealing surface 8. The O-type sealing groove 2 is arranged around the metal shell 1 of the penetration joint.

[0027] Two radial limiting grooves 6 are arranged on the side walls of the axial through hole 3 and the step groove 12. The limiting grooves 6 are arranged in an annular shape. In this embodiment, two limiting grooves 6 are arranged on the side walls of the axial through hole 3 and the step groove 12. The limiting grooves 6 are respectively close to the two ends of the corresponding axial through hole 3 and the side walls of the step groove 12 that are opposite to each other.

[0028] In order to facilitate the drive of the present invention to be screwed into the through hole of the cabin of the underwater equipment, the side wall of the boss 11 is provided with two cutting surfaces 10, and the two cutting surfaces 10 are symmetrically arranged.

[0029] The structure and pressure-resistant sealing method of the present application can avoid the limitations of high price and large size of watertight connectors instead of cabin penetration connectors, and solve the pressure-resistant sealing problem of underwater cables 4 penetrating cabins.

[0030] This application makes up for the lack of low-cost pressure-resistant watertight penetration joint products in shallow water environments, thereby effectively reducing manufacturing costs and reducing joint volume, and specific performance values ​​can be reduced or reduced by more than 50%.

[0031] The watertight penetration joint of the present application has good pressure-resistant sealing effect, reliable performance, simple manufacturing, and high universality of the cable 4 and the joint. The penetration joint was used for more than 60 times in a simulated hydrostatic pressure environment of 10MPa (1000 meters underwater) without leakage or failure.

[0032] The cabin penetration joint structure of the present application provides multiple limit protections for the internal cables 4 and the colloid, preventing the cables 4 and the colloid from falling off due to dragging, thereby significantly improving the tensile strength of the cabin penetration component.

[0033] Embodiment 2: A method for manufacturing a watertight penetration joint structure as described in Embodiment 1, comprising the following steps: Step 1: First, a penetration joint metal shell 1 with an external thread is formed by machining, and a boss 11 is integrally machined at one end of the penetration joint metal shell 1, two symmetrical side walls of the boss 11 are cut to form a cutting surface 10, and an axial through hole 3 and a step groove 12 are opened in the penetration joint metal shell 1, an O-type sealing groove 2 is opened on the contact sealing surface 8 at the bottom of the boss 11, and two radial limiting grooves 6 are opened on the side walls of the axial through hole 3 and the step groove 12 respectively;

[0034] Step 2: Clean the inside and outside of the metal shell 1 of the penetration joint with alcohol, and after the middle axial through hole 3 is dry, apply a thin layer of adhesive on its inner wall, pass the cable 4 through the axial through hole 3, and put a short section of heat shrink tube on the outer thread 9 of the metal shell of the lower half of the penetration joint metal shell 1 and heat-curing it;

[0035] Step 3: Fill the epoxy resin sealant from the top of the boss 11, leaving 10% of the depth, and after the sealant is completely cured, fill the elastic silicone rubber until it is flush with the upper end surface of the shell, and wait for the silicone rubber to cure before use;

[0036] Step 4: After the filled colloid is completely solidified, the outer thread 9 of the metal shell is matched and fastened with the inner thread of the opening of the cabin of the underwater equipment to achieve sealing.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for manufacturing a pressure-resistant sealing structure of a watertight penetration joint, characterized in that: The pressure-resistant sealing structure of the watertight penetration joint comprises a penetration joint metal shell (1), one end of the penetration joint metal shell (1) is integrally formed with a boss (11), the boss (11) protrudes from the side wall of the penetration joint metal shell (1), the penetration joint metal shell (1) is provided with an axial through hole (3), the axial through hole (3) passes through the boss (11), the side wall of the penetration joint metal shell (1) is provided with a metal shell external thread (9), and the side wall of the axial through hole (3) is provided with a step groove (12), the step groove (12) is located at the axial A through hole (3) is provided at one end of the boss (11), the axial through hole (3) and the step groove (12) are filled with an epoxy resin sealant layer (7), and an elastic silicone rubber layer (5) is provided at one end of the step groove (12) away from the external thread (9) of the metal shell, the elastic silicone rubber layer (5) is in close contact with the epoxy resin sealant layer (7), and a cable (4) is provided in the elastic silicone rubber layer (5) and the epoxy resin sealant layer (7), and the end surface of the boss (11) facing the metal shell (1) of the through-cabin joint is a contact sealing surface (8); The manufacturing method comprises the following steps: the first step: firstly, a through-tank joint metal shell (1) with an external thread is formed by machining, and a boss (11) is integrally machined at one end of the through-tank joint metal shell (1), two symmetrical side walls of the boss (11) are cut to form a cutting surface (10), and an axial through hole (3) and a step groove (12) are opened in the through-tank joint metal shell (1), an O-type sealing groove (2) is opened on the contact sealing surface (8) at the bottom of the boss (11), and two radial limiting grooves (6) are respectively opened on the side walls of the axial through hole (3) and the step groove (12); Step 2: Clean the inside and outside of the metal shell (1) of the penetration joint with alcohol, and after the middle axial through hole (3) is dry, apply a thin layer of adhesive on its inner wall, pass the cable (4) through the axial through hole (3), and put a short section of heat shrink tube on the outer thread (9) of the metal shell of the lower half of the penetration joint metal shell (1) and cure it by thermoplasticization; Step 3: Fill the top of the boss (11) with epoxy resin sealant, leaving a depth of 10%. After the sealant is completely cured, fill it with elastic silicone rubber until it is flush with the upper end surface of the shell. Wait for the silicone rubber to cure and then set aside. Step 4: After the injected colloid is completely solidified, the outer thread (9) of the metal shell is matched and fastened with the inner thread of the opening of the cabin of the underwater equipment, thereby achieving sealing.

2. The method for manufacturing the pressure-resistant sealing structure of the watertight penetration joint according to claim 1, characterized in that: The side walls of the axial through hole (3) and the step groove (12) are provided with two radial limiting grooves (6), and the limiting grooves (6) are arranged in an annular shape.

3. The method for manufacturing the pressure-resistant sealing structure of the watertight penetration joint according to claim 1, characterized in that: The contact sealing surface (8) is provided with an O-shaped sealing groove (2), and the O-shaped sealing groove (2) is arranged around the metal shell (1) of the penetration joint.

4. The method for manufacturing the pressure-resistant sealing structure of the watertight penetration joint according to claim 1, characterized in that: The side wall of the boss (11) is provided with two cutting surfaces (10), and the two cutting surfaces (10) are symmetrically arranged.

5. The method for manufacturing the pressure-resistant sealing structure of the watertight penetration joint according to claim 1, characterized in that: The metal shell (1) of the penetration joint is made of aluminum alloy or stainless steel.

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