Variable working condition gas-liquid two-phase medium low-resistance radial sealing structure

Abstract

A kind of low resistance radial seal structure of variable working condition gas-liquid two-phase medium, including sealing body, rubber sleeve and spring skeleton, sealing body is installed in the rectangular groove of equipment, with shaft body radial seal, rubber sleeve includes annular rib, semi-elliptical annular groove, notch and lip etc.Characteristics.Rubber sleeve outer ring is an arc lip, lip is in close contact with the outer surface of shaft body, constitutes first sealing surface;Rubber sleeve upper and lower outer ring each pre-embedded a spring skeleton, with sealing piece molding, provide support for sealing piece, prevent its collapse;Rubber sleeve inner ring longitudinal section is provided with a semi-elliptical annular groove, annular groove two sides are annular rib, four notches are evenly arranged in lower annular rib.The sealing piece structure of the application is simple, easy to disassemble and assemble, especially for the equipment involving large diameter rotary sealing surface, for different specific working conditions, can meet the performance requirements of low resistance and reliable sealing of high pressure seawater and high pressure air at the same time.

Description

Technical Field

[0001] This invention relates to the field of underwater dynamic sealing devices, and in particular to a low-resistance radial sealing structure for gas-liquid two-phase media under varying operating conditions. Background Technology

[0002] For underwater rescue equipment, such as rotating skirts and hatch covers, various operating conditions are involved during operations. Taking the docking hatch cover of underwater rescue equipment as an example: During underwater docking, the inner side of the hatch cover (corresponding to the upper side of the seal) is high-pressure air (0-5 bar), and the outer side is high-pressure water (the pressure is much greater than that of high-pressure air), requiring the seal to reliably isolate the external water; after docking, the two sides of the hatch cover are filled with air at the same pressure, requiring manual operation to open the hatch cover, requiring the seal to have low resistance and the hatch cover to rotate flexibly; after returning to the mother ship deck on the surface, the inner side of the hatch cover is filled with high-pressure air (0-5 bar), and the outer side is filled with normal-pressure air, requiring the seal to reliably seal the high-pressure air. Equipment such as rotating skirts and hatch covers involve large-diameter rotating surfaces, requiring flexible rotation and the ability to reliably seal and isolate high-pressure seawater and high-pressure air under different operating conditions. The selection of the sealing structure of the equipment seals must simultaneously consider friction performance and sealing performance for gas-liquid two-phase media. Currently available large-diameter radial seals, such as Glyd rings and star-shaped rings, cannot meet low-resistance requirements while ensuring high-pressure sealing reliability. Oil seals and similar structures offer low resistance during rotation but cannot seal high-pressure media. Therefore, we propose a low-resistance radial sealing structure for variable-condition gas-liquid two-phase media. Summary of the Invention

[0003] To address the shortcomings of the existing production technology, the applicant provides a low-resistance radial sealing structure for gas-liquid two-phase media under varying operating conditions, thereby achieving better sealing performance.

[0004] The technical solution adopted in this invention is as follows:

[0005] A low-resistance radial sealing structure for a gas-liquid two-phase medium under varying operating conditions includes a rotating component with a rectangular groove on it. A sealing element body is installed in the rectangular groove to achieve radial sealing with the structural shaft.

[0006] The sealing element body is equipped with a spring skeleton and a rubber sleeve.

[0007] The rubber sleeve has a transverse "convex" shaped structure, including annular ribs, a semi-elliptical annular groove, slits, and lips. The outer ring of the rubber sleeve has an arc-shaped lip that fits tightly against the outer surface of the structural shaft and can rotate relative to it, forming the first sealing surface. The inner ring of the rubber sleeve has a semi-elliptical annular groove in its longitudinal section. The two sides of the semi-elliptical annular groove are annular ribs. The lower annular ribs have four slits evenly distributed. The upper annular rib fits tightly against the bottom surface of the rectangular groove, forming the second sealing surface. When the sealing element is used with high-pressure air, with high-pressure air on the upper side and normal-pressure air on the lower side, the sealing element moves axially under pressure until the lower surface fits against the rectangular groove to form the third sealing surface. When the sealing element is used to seal high-pressure water, water enters the semi-elliptical annular groove space of the inner ring of the sealing element from the slit at the lower edge of the sealing element, providing support for the inner ring of the sealing element and radially compressing the sealing element, increasing the radial compression of the sealing element. At the same time, under pressure, the sealing element moves axially until the upper surface fits against the rectangular groove to form the fourth sealing surface.

[0008] Its further technical solution lies in:

[0009] The sealing element body is manufactured as a single piece.

[0010] The sealing element body has a ring-shaped structure.

[0011] The sealing element body has an axisymmetric structure.

[0012] A spring skeleton is pre-embedded at the outer ring of the upper and lower sides of the rubber sleeve. The spring skeleton is molded with the rubber sleeve to provide support for the sealing body and prevent collapse.

[0013] The spring frame has a circular structure.

[0014] The beneficial effects of this invention are as follows:

[0015] This invention features a compact and rational structure, and is easy to operate. Through the cooperative working of the sealing body, rubber sleeve, and spring skeleton, underwater dynamic sealing can be easily achieved. The rubber sleeve of the sealing element described in this invention has low hardness, making it easier to form an initial seal between the sealing element and the structural components. The annular rib tightly adheres to the bottom surface of the rectangular groove to form a second sealing surface. When the upper side of the sealing element is subjected to high-pressure air, it moves axially under pressure until the lower surface of the sealing element is in contact with the rectangular groove to form a third sealing surface. When the lower side of the sealing element is subjected to high-pressure water (pressure much greater than high-pressure air), water enters the semi-elliptical annular groove of the inner ring of the sealing element from the lower side cut, radially compressing the sealing element. Simultaneously, the sealing element moves axially until its upper surface is in contact with the rectangular groove to form a fourth sealing surface.

[0016] The sealing element described in this invention has a simple structure and is easy to assemble and disassemble. Especially for equipment involving large-diameter rotating sealing surfaces, it can simultaneously meet the performance requirements of low resistance and reliable sealing of high-pressure seawater and high-pressure air for different specific working conditions.

[0017] The sealing element of this invention consists of a rubber sleeve and a spring skeleton, including features such as annular ribs, semi-elliptical annular grooves, slits, and lips. The selection of the hardness of the rubber sleeve material and the setting of the annular rib features make it easier for the sealing element to form an initial seal under low pre-pressure, ensuring low resistance performance between the sealing ring and the structural shaft. When the upper side of the sealing element is high-pressure air, a third sealing surface will be automatically formed, improving the high-pressure air sealing performance and reliability of the sealing element. When the lower side of the sealing element is high-pressure water, the water enters the semi-elliptical annular groove from the slit, providing support and compensation for the inner ring of the sealing element. The high-pressure water radially compresses the sealing element, increasing the radial compression of the sealing element, and at the same time automatically forming a fourth sealing surface, improving the high-pressure water sealing performance and reliability of the sealing element.

[0018] This invention has high application value and can be applied and expanded in the field of underwater operation equipment or other equipment with similar working conditions. Attached Figure Description

[0019] Figure 1 This is a top view of the sealing structure of the present invention.

[0020] Figure 2 for Figure 1 Cross-sectional view of the middle sealing component structure AA.

[0021] Figure 3 for Figure 1 Cross-sectional view of the middle sealing component structure BB.

[0022] Figure 4 This is a diagram showing the rotating operation of the seal of the present invention.

[0023] Figure 5 This is a diagram illustrating the sealing condition of the sealing element of the present invention under high-pressure air conditions.

[0024] Figure 6 This is a diagram illustrating the sealing condition of the sealing element of this invention under high-pressure seawater.

[0025] The components include: 1. Sealing body; 2. Rotating parts; 3. Structural shaft; 4. Sealing high-pressure water; 5. High-pressure air medium.

[0026] 101. Spring frame; 102. Rubber sleeve;

[0027] 1021. Annular rib; 1022. Semi-elliptical annular groove; 1023. Cut; 1024. Lip; 1025. First sealing surface; 1026. Second sealing surface; 1027. Third sealing surface; 1028. Fourth sealing surface. Detailed Implementation

[0028] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0029] like Figures 1-6 As shown, the variable working condition gas-liquid two-phase medium low resistance radial sealing structure of this embodiment includes a rotating component 2, a rectangular groove is opened on the rotating component 2, and a sealing component body 1 is installed in the rectangular groove, thereby achieving radial sealing with the structural shaft 3.

[0030] The sealing element body 1 is provided with a spring skeleton 101 and a rubber sleeve 102.

[0031] The rubber sleeve 102 has a transverse "convex" shaped structure, including annular ribs 1021, a semi-elliptical annular groove 1022, cuts 1023, and a lip 1024. The outer ring of the rubber sleeve 102 is an arc-shaped lip 1024, which is in close contact with the outer surface of the structural shaft 3 and can rotate relative to it, forming the first sealing surface 1025. The inner ring of the rubber sleeve 102 has a semi-elliptical annular groove 1022 in its longitudinal section. The two sides of the semi-elliptical annular groove 1022 are annular ribs 1021. The lower annular ribs 1021 have four evenly distributed cuts 1023. The upper annular ribs 1021 are in close contact with the bottom surface of the rectangular groove, forming the second sealing surface 1026. When the sealing body 1 is used with high-pressure air medium 5, and the upper side is high-pressure air and the lower side is normal-pressure air, the sealing body 1 moves axially under pressure until the lower surface fits with the rectangular groove to form the third sealing surface 1027. When the sealing body 1 is used to seal high-pressure water 4, water enters the semi-elliptical annular groove 1022 space of the inner ring of the sealing body 1 from the cut 1023 at the lower edge of the sealing body 1, providing support for the inner ring of the sealing body 1, radially squeezing the sealing body, increasing the radial compression of the sealing body 1, and at the same time, the sealing body moves axially under pressure until the upper surface fits with the rectangular groove to form the fourth sealing surface 1028.

[0032] The sealing element body 1 is made into a one-piece structure.

[0033] The sealing body 1 has a ring-shaped structure.

[0034] The sealing body 1 has an axisymmetric structure.

[0035] A spring skeleton 101 is pre-embedded at the outer ring of the upper and lower sides of the rubber sleeve 102. The spring skeleton 101 is molded with the rubber sleeve 102 to provide support for the sealing body 1 and prevent collapse.

[0036] The spring frame 101 has a circular structure.

[0037] Figure 1 This is a top view of the low-resistance radial sealing structure for variable-condition gas-liquid two-phase media according to the present invention. Figure 2This is a cross-sectional view (AA) of the seal structure, showing the main features of the seal. Figure 3 The BB cross-sectional view of the seal structure mainly shows the notch features of the seal.

[0038] The specific structure and function of the low-resistance sealing structure for variable operating conditions gas-liquid two-phase media described in this invention are as follows:

[0039] It mainly includes a sealing body 1 and a spring skeleton 101 and a rubber sleeve 102 disposed on the sealing body 1.

[0040] The rubber sleeve 102 includes features such as annular ribs 1021, semi-elliptical annular grooves 1022, slits 1023, and lips 1024.

[0041] The sealing body 1 is installed in the rectangular groove of the rotating part 2 of equipment such as hatch covers or swivel skirts, and is radially sealed to the structural shaft 3.

[0042] Among them, a spring skeleton 101 is pre-embedded at the outer ring of the upper and lower sides of the rubber sleeve 102, and is molded with the rubber sleeve 102 to provide support for the sealing body 1 and prevent it from collapsing.

[0043] The outer ring of the rubber sleeve 102 is an arc-shaped lip 1024. The lip 1024 is in close contact with the outer surface of the structural shaft 3 and can rotate relative to it, forming the first sealing surface 1025.

[0044] The inner ring of the rubber sleeve 102 has a semi-elliptical annular groove 1022 in its longitudinal section. The annular groove has annular ribs 1021 on both sides. The lower annular ribs 1021 have four evenly distributed cuts 1023. The cuts 1023 are short and do not affect the support of the lower annular ribs 1021 for the structure of the sealing body 1, and will not cause the structure of the sealing body 1 to collapse when under pressure. The upper annular ribs 1021 are close to the bottom surface of the rectangular groove to form the second sealing surface 1026.

[0045] The rubber sleeve 102 of this invention has a Shore hardness of about 60, which is relatively low. The annular rib 1021 provides the initial pre-pressure required for sealing due to the low hardness of the rubber sleeve 102 and the thinness of the annular rib 1021. The rigidity of the seal is small, and the pre-pressure required to form an initial seal between the seal and the structural component is small and easy to control precisely. The resistance between the seal and the structural component is small, and the rotation is flexible.

[0046] Figure 4 In the case of the seal rotating, the upper and lower end faces of the seal body 1 are filled with air at the same pressure, and the seal body 1 and the structural component are under the pre-pressure of the initial seal, so the resistance to their relative rotation is small.

[0047] Figure 5For sealing high-pressure air conditions, the upper end face of the sealing body 1 is high-pressure air medium 5 (0-5 bar), and the lower end face is normal pressure air. Under pressure, the sealing body 1 moves axially until its lower surface fits with the rectangular groove to form a third sealing surface 1027, which improves the sealing ability of the sealing body 1 to withstand high-pressure air.

[0048] Figure 6 For sealing high-pressure water conditions, the lower side of the seal is filled with high-pressure water 4 (the pressure is much greater than that of high-pressure air), and the upper side is filled with high-pressure air medium 5 (0-5 bar). Water enters the semi-elliptical annular groove 1022 space of the inner ring of the seal body 1 from the cut 1023 at the lower edge of the seal body 1, providing support for the inner ring of the seal body 1, radially compressing the seal, increasing the radial compression of the seal body 1, and at the same time, under the action of pressure, the seal moves axially until its upper surface fits with the rectangular groove to form the fourth sealing surface 1028, which greatly improves the sealing ability of the seal body 1 against high-pressure water.

[0049] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. A low-resistance radial sealing structure for a gas-liquid two-phase medium under varying operating conditions, characterized in that: It includes a rotating component (2), on which a rectangular groove is opened, and a sealing body (1) is installed in the rectangular groove, thereby achieving radial sealing with the structural shaft (3); The sealing body (1) is provided with a spring skeleton (101) and a rubber sleeve (102). The rubber sleeve (102) has a transverse "convex" shaped structure, including annular ribs (1021), semi-elliptical annular grooves (1022), cuts (1023), and lips (1024). The outer ring of the rubber sleeve (102) is an arc-shaped lip (1024), which is in close contact with the outer surface of the structural shaft (3) and can rotate relative to it, forming the first sealing surface (1025). The inner ring of the rubber sleeve (102) has a semi-elliptical annular groove (1022) in its longitudinal section. The semi-elliptical annular groove (1022) has annular ribs (1021) on both sides. The lower annular ribs (1021) have four cuts (1023) evenly distributed. The upper annular ribs (1021) are in close contact with the bottom surface of the rectangular groove, forming the second sealing surface (1025). 26); When the sealing body (1) is used in high-pressure air medium (5), the upper side is high-pressure air and the lower side is normal pressure air. Under pressure, the sealing body (1) moves axially until the lower surface fits with the rectangular groove to form a third sealing surface (1027). When the sealing body (1) is used to seal high-pressure water (4), water enters the semi-elliptical annular groove (1022) space of the inner ring of the sealing body (1) from the cut (1023) at the lower edge of the sealing body (1), providing support for the inner ring of the sealing body (1), radially squeezing the sealing body, increasing the radial compression of the sealing body (1), and at the same time, under pressure, the sealing body moves axially until the upper surface fits with the rectangular groove to form a fourth sealing surface (1028).

2. The low-resistance radial sealing structure for a gas-liquid two-phase medium under varying operating conditions as described in claim 1, characterized in that: The sealing element body (1) is made into an integral structure.

3. The low-resistance radial sealing structure for a gas-liquid two-phase medium under varying operating conditions as described in claim 1, characterized in that: The sealing element body (1) has a ring-shaped structure.

4. The low-resistance radial sealing structure for a gas-liquid two-phase medium under varying operating conditions as described in claim 1, characterized in that: The sealing element body (1) has an axisymmetric structure.

5. The low-resistance radial sealing structure for a gas-liquid two-phase medium under varying operating conditions as described in claim 1, characterized in that: A spring skeleton (101) is pre-embedded at the outer ring of the upper and lower sides of the rubber sleeve (102). The spring skeleton (101) and the rubber sleeve (102) are molded together to provide support for the sealing body (1) and prevent collapse.

6. The low-resistance radial sealing structure for a gas-liquid two-phase medium under varying operating conditions as described in claim 1, characterized in that: The spring frame (101) has a circular structure.

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