CN104832646A - Sleeve sealing assembly - Google Patents

Abstract

The invention discloses a casing sealing assembly, which comprises coaxially arranged pipelines (1), connecting studs (2), nuts (3), sleeves (4) and sealing rings (5), and the outer surface of the pipelines An annular boss (11) is arranged, and a protruding ring (12) is arranged on one side of the boss (11), and one side of the sealing ring (5) is against the protruding ring (12), and the other side is against the connecting stud ( 2); the nut (3) is sleeved on the connecting stud (2) and the sleeve (4). The invention has the characteristics of simple structure, convenient installation and disassembly, reusability, wide range from room temperature to low temperature, and good sealing performance.

Description

A sleeve seal assembly

technical field

The invention relates to a sealing device, in particular to a casing sealing assembly.

Background technique

Casing seal components in the field of refrigeration and cryogenic engineering, because the physical properties of materials in low-temperature environments are quite different from those in normal temperatures, they need to be specially designed to meet the characteristics of fast connection and disassembly, simple structure, and good sealing performance. Commonly used rubber sealing rings tend to become brittle and lose their sealing performance in low temperature situations, especially in deep and low temperature situations such as the liquid nitrogen temperature range (80K, below -193°C). In addition, most of the existing sealing technologies and structures currently form surface seals through the close cooperation between surfaces, while for mechanical seals, line seals have a smaller area and higher pressure, and their sealing performance is better than that of surface seals. Seal better. Therefore, there is a need for a detachable sealing assembly that can adapt to deep low temperature and has good sealing performance, so as to meet the needs of some special applications and practical engineering.

In the prior art, there are low-temperature-resistant sealing rings. Chinese patent CN102767572A discloses a low-temperature-resistant sealing ring for double-row full complement cylindrical roller bearings. The structure includes a silicone rubber sealing ring and a supporting steel skeleton through injection molding. The buckle is integrated into a whole, with low temperature resistance and double sealing. Although silicone rubber has better low temperature resistance than ordinary rubber, it is still not suitable for liquid nitrogen temperature zone, and it will start to become brittle when the temperature is lower than -120 °C. Chinese patent CN203500516U discloses a low-temperature sealing valve. The structure mainly adopts a double-cone sealing pair combining bellows sealing and soft and hard sealing. It can not only be applied to liquid nitrogen and liquid oxygen occasions, but also has good sealing performance. However, this structure focuses on solving the problem of internal leakage of the valve, and cannot solve the problems of connection, fixing and sealing of pipelines.

Chinese patent CN102252140A discloses a sealing joint for deep-low temperature non-metallic pipelines. The sealing joint includes nuts, metal sealing rings, connecting studs and non-metallic connecting pipelines. The radial force generated by the external structure of the pipelines is used to make the metal seal The ring deformation is in close contact with the outer surface, so as to achieve the sealing effect. The structure solves the connection problem of metal and non-metal pipelines, has good sealing effect, and is applicable to a wide range from room temperature to deep low temperature. However, the contact between the metal sealing ring and the outer surface of the connecting pipeline is surface contact. Due to the characteristics of its flat seal, the sealing force is relatively large, and the required operating force is also large, and it is squeezed by a large radial force at room temperature. After pressing and close contact, entering the deep low temperature environment, because the thermal expansion coefficient of non-metallic materials is greater than that of metal materials, the metal sealing ring and the outer surface of the connecting pipeline are too closely contacted, which may damage the components.

Contents of the invention

The invention provides a casing sealing assembly which can be used in low temperature environment, has good sealing performance, simple structure and convenient installation and disassembly.

For this reason, the present invention adopts the following technical solutions: a casing sealing assembly, including coaxially arranged pipelines, nuts, connecting studs, sealing rings and sleeves, and an annular boss on the outer surface of the pipeline, the boss There is a convex ring on one side, and one side of the sealing ring is against the convex ring, and the other side is against the connecting stud; the nut is sleeved outside the connecting stud and the sleeve.

In the present invention, the sealing effect of the casing sealing assembly is achieved through the cooperation of the sealing ring, the pipeline and the sleeve. By screwing in the connecting stud, relative movement occurs between the connecting stud and the nut, and the sealing ring is squeezed, and the outside of the pipeline is sealed. The convex ring on the side of the boss on the surface tightly tops the sealing ring to achieve a good sealing effect; the casing sealing assembly can be disassembled by unscrewing the connecting stud, and the sealing ring can be removed for replacement.

Preferably, the matching part of the sleeve and the boss extends outward to form a neck boss, and the inner edge of the nut cooperates with the side of the neck boss, avoiding the connection through the tight surface contact between the inner surface of the nut and the outer surface of the sleeve The nut and sleeve reduce the operating force, making the operation easy, and at the same time reduce the wear caused by surface friction and improve the service life of the components.

Preferably, the sealing ring is a truncated cone, the upper surface of the sealing ring is against the convex ring, and the lower surface of the sealing ring is against the connecting stud, so that the two faces of the sealing ring are in linear contact with the ports of the sleeve, and the linear contact has a small Compared with the surface contact, the sealing performance is better than that of the surface contact, which further improves the sealing performance.

Preferably, the taper of the sealing ring ranges from 30 degrees to 45 degrees, which can avoid the small deformation of the sealing ring due to excessive taper, and at the same time avoid the insufficient effective sealing of the sealing ring due to too small taper, and optimize the sealing performance of the sealing ring.

Preferably, the cross-section of the boss is rectangular to ensure that the upper end surface of the sealing ring is only in contact with the boss and will not directly contact the side of the boss, thereby reducing the contact area and improving the sealing performance.

Preferably, the protruding ring is located on the center line of the side of the boss, so that the contact force between the sealing ring and the protruding ring is uniform, and the sealing performance is improved.

Preferably, the cross section of the convex ring is triangular, which is beneficial to reduce the contact area between the upper end surface of the sealing ring and the convex ring, so that the close contact between the convex ring and the upper end surface of the sealing ring is close to linear contact, thereby improving the sealing performance.

Preferably, the pipeline, connecting stud, nut, sleeve and sealing ring are made of metal, and the material of the sealing ring is oxygen-free copper. According to the characteristic that the performance of metal generally does not change dramatically at low temperature, the casing sealing assembly has reliability in low temperature environment. The material of the sealing ring is oxygen-free copper, which has good low temperature resistance and soft texture. The material of the sleeve and the pipeline is stainless steel, which is hard. The sealing ring forms a soft-hard composite seal with the sleeve and the pipeline, and the sealing performance is good. Because the thermal expansion coefficient of copper is relatively large among metals, the shrinkage of the sealing ring is more severe than that of the pipeline in a low temperature environment, which makes the contact between the sealing ring and the pipeline more closely, ensuring the sealing performance of the casing sealing assembly in a low temperature environment.

Therefore, the bushing sealing assembly of the present invention has good sealing performance, is suitable for a wide range from room temperature to low temperature (liquid nitrogen temperature zone), and the sealing performance is not affected by temperature, and the structure is simple; in addition, the present invention is a detachable low temperature The sealing part is easy to install and disassemble, and the oxygen-free copper sealing ring is replaceable and reusable.

Description of drawings

Fig. 1 is a schematic structural view of the casing sealing assembly of the present invention.

Fig. 2 is a partially enlarged view of part A of the casing seal assembly shown in Fig. 1 .

in:

1. Pipeline; 2. Connecting stud; 3. Nut; 4. Sleeve; 5. Seal ring; 11. Boss; 12. Protruding ring; 41. Neck boss.

Detailed ways

As shown in FIG. 1 and FIG. 2 , the casing sealing assembly of the present invention includes a coaxially arranged pipeline 1 , connecting stud 2 , nut 3 , sleeve 4 and sealing ring 5 . The material of pipeline 1, connecting stud 2, nut 3, sleeve 4 and sealing ring 5 is metal, wherein the material of sealing ring 5 is oxygen-free copper, and the sleeve 4 and pipeline 1 are stainless steel.

There is a coaxial annular boss 11 on the outer surface of the pipeline 1, and the section of the boss 11 on the plane where the axis of the pipeline 1 is located is rectangular; the side of the boss 11 facing the connecting stud 2 is provided with a The convex ring 12 coaxial with the pipeline 1, the section of the convex ring 12 on the plane where the axis of the pipeline 1 is located is triangular, forming a triangular protrusion, which is in close contact with the top surface of the sealing ring during assembly. The protruding ring 12 is located on the center line of the side of the boss 11 , that is, in the radial direction of the pipeline 1 , and the protruding ring 12 is located in the middle of the side of the boss 11 .

The sealing ring 5 is an annular truncated cone, which is set on the outer wall of the pipeline 1, and the taper is 30 degrees; The upper surface is a large diameter section, and the lower bottom surface is a small diameter end; The sealing ring 5 is made of oxygen-free copper, which is relatively soft, and forms a soft-hard composite seal with the sleeve 4 and the pipeline 1 . After being squeezed by the connecting stud 2 during assembly, the upper top surface of the sealing ring 5 is in close contact with the convex ring 12 of the boss 11 of the pipeline 1 to form a linear seal, and the female and female surfaces of the sealing ring 5 are connected with the sleeve 4 One side edge of the stud 2 is in close contact to form a linear seal.

In this embodiment, the sleeve 4 may be the end of the pipeline that needs to be connected with the pipeline 1, or it may be the connection end of a certain component, etc. The mating parts of the sleeve 4 and the sealing ring 5 extend outward to form a neck boss 41 , and the inner edge of the nut 3 fits with the side of the neck boss 41 . Both the connecting stud 2 and the sleeve 4 are sleeved on the outer wall of the pipeline 1, and the outer wall of the connecting stud 2 is provided with external threads. The connecting stud 2 and the sleeve 4 are respectively arranged on both sides of the sealing ring 5 . The nut 3 is sleeved on the opposite ends of the connecting stud 2 and the sleeve 4, and is positioned in cooperation with the external thread on the outer wall of the connecting stud 2 and the neck boss 41 of the sleeve 4, respectively.

During installation, the pipeline 1, connecting stud 2, nut 3, sleeve 4 and sealing ring 5 are coaxially arranged in sequence, and screwed into the connecting stud 2, so that relative movement occurs between the connecting stud 2 and the nut 3, squeezing Press the sealing ring 5 so that the upper top surface of the sealing ring 5 is tightly against the convex ring 12 to form a linear seal, and the mother and child surfaces of the sealing ring 5 are tightly against the port of the sleeve 4 to form a linear seal; when the connecting stud 2 is tightened , the casing sealing assembly is installed and can meet the sealing requirements. When disassembling, unscrew the connecting stud 2, and then the pipeline 1, the connecting stud 2, the nut 3, the sleeve 4 and the sealing ring 5 can be removed. When the sealing ring 5 deforms greatly and loses the sealing effect, unscrew the connecting stud 2, take off the sealing ring 5 and replace it, and then screw in the connecting stud 2 to perform the installation steps again, and the casing sealing assembly can be reused.

Claims (8)

1. A casing seal assembly, comprising a coaxially arranged pipeline (1), a connecting stud (2), a nut (3), a sleeve (4) and a sealing ring (5), characterized in that: There is an annular boss (11) on the outer surface of the pipeline (1), and a convex ring (12) is arranged on one side of the boss (11), and one side of the sealing ring (5) is against the convex ring (12), and the other side against the connecting stud (2); the nut (3) is sleeved outside the connecting stud (2) and the sleeve (4). 2. The bushing seal assembly according to claim 1, characterized in that: the matching part of the sleeve (4) and the boss (11) extends outward to form a neck boss (41), The inner edge of the nut (3) cooperates with the side of the neck boss (41). 3. The casing sealing assembly according to claim 1, characterized in that: the sealing ring (5) is a truncated cone, the upper surface of the sealing ring (5) is against the convex ring (12), and the sealing ring (5) is (5) The lower bottom surface is against the connecting stud (2). 4. The casing sealing assembly according to claim 3, characterized in that: the taper of the sealing ring (5) ranges from 30° to 45°. 5. The casing sealing assembly according to claim 1, characterized in that: the section of the boss (11) is rectangular. 6. The bushing seal assembly according to claim 1, characterized in that: said protruding ring (12) is located on the side centerline of said boss (11). 7. The bushing seal assembly according to claim 1, characterized in that the section of the protruding ring (12) is triangular. 8. The bushing sealing assembly according to claim 1, characterized in that: the pipeline (1), the connecting stud (2), the nut (3), the sleeve (4) and the sealing ring (5) The material is metal, and the material of the sealing ring (5) is oxygen-free copper.