Sealing ring for groove connection

Abstract

The utility model discloses a sealing ring for groove connection for a high-pressure pipeline, which is matched with a hoop and comprises a rubber ring, a sealing ring and an elastic semi-ring, the sealing ring is located in the middle of the inner surface of the rubber ring and installed at the joint of the end faces of the two steel pipes, and the inner diameter is not larger than that of the steel pipes. The clamp and the inner side of the groove are in slope fit to provide sealing extrusion force for the end face of the steel pipe. The elastic semi-ring is arranged on the outer surface of the rubber ring or fixed in the rubber ring, and the assembling surface of the elastic semi-ring is consistent with the pre-tightening force direction of the bolt; or more than two sets of elastic semi-rings are uniformly distributed in the axial direction, and the splicing surfaces are mutually staggered. Or a cavity is formed in the rubber ring, passes through an inner opening in the inner end face of the inner pipe sealing ring, or is communicated with the outer pipe extending out of the outer side of the hoop. The utility model has the advantages of double sealing, good sealing performance and convenience in installation.

Description

Technical Field

[0001] The utility model is applied to the field of pipeline connection sealing, relates to pipeline groove connection, and specifically is a sealing ring for clamp groove connection. Background Art

[0002] The clamp groove connection is convenient and is usually used for low-pressure pipeline connection. Its sealing method limits its application in high-pressure pipelines. Figure 1 and attached Figure 2 As shown. A groove 2 is provided on the end section of the steel pipe 1, and the semicircular edge of the clamp 3 fits in the groove, and then is fastened with bolts 5 to achieve the connection of the pipeline. Whether the rubber ring 4 in the clamp 3 is solid or hollow, it is the deformation of the rubber ring 4 in the clamp that seals the outer surface of the steel pipe. This sealing method is the outer circumferential surface sealing of the steel pipe. Figure 2 The pre-tightening force of the bolt is in the up and down direction. After the bolt is installed and the clamp is tightened, the rubber ring located at the top of the clamp arc has a large tightening pre-tightening force and a relatively good sealing effect. At other positions, the component of the pre-tightening force causes the rubber ring to deform. At the fastening bolt, that is, the connection between the two clamps, the component of the pre-tightening force is close to zero. The sealing effect of the rubber ring here is relatively poor, so the clamp connection can only be used for low-pressure pipelines. Although the hollow rubber ring can rely on the pressure of the pressurized fluid in the pipeline to achieve sealing, the rubber rings at the left and right fastening bolts have no pre-tightening force. Once the fluid enters the sealing surface between the rubber ring and the outer circumference of the steel pipe, the pressure sealing effect of the pressurized fluid in the hollow is greatly weakened. Therefore, it is necessary to improve the existing clamp and sealing ring structure to meet the connection of high-pressure fluid pipelines and expand the application range of this connection form.

[0003] There are many patent applications for sealing rings that match the clamp, such as CN216520187U, a sealing ring for a clamp-type quick connector, to improve the strength of the sealing ring. CN201858452U, a pipeline connection sealing ring, is used to seal the clamp connection pipeline. The sealing rings are respectively installed on both sides of the center of the sealing body. The sealing rings are bevel sealed or beveled arc sealed, and are made of metal wire and flexible graphite composite. CN208719625U, a grooved pipe fitting sealing ring, solves the corrosion problem of the end face of the grooved pipe. The end face of the left grooved pipe is pressed against the left wall of the sealing ring, and the end face of the right grooved pipe is pressed against the right wall of the sealing ring. The sealing ring prevents the end face of the grooved pipe from directly contacting water, thereby preventing water from corroding the end face of the grooved pipe. This patent does not explain how to achieve the pressing of the grooved pipes on both sides against the sealing ring. In addition, since the sealing ring can achieve the sealing of the end face of the grooved pipe, the sealing effect of the inner wall of the tapered hole being squeezed and deformed to fit tightly against the outer wall of the grooved pipe is redundant. CN209294390U discloses a sealing ring for a quick-release clamp, comprising left and right mounting assemblies, with left and right clamping strips sealingly connecting the left and right mounting assemblies to the quick-release clamp, respectively. The right inserting strip cooperates with the left mounting groove, and the left clamping block cooperates with the right mounting groove. The left and right frames cooperate to form a circular structure. CN220828625U discloses a sealing ring and pipe connection structure, wherein a raised portion is provided in the middle of the inner ring surface of the rubber ring wall. The raised portion can prevent negative pressure, and the inner side surface of the raised portion is concave, forming a space to accommodate the rotation of the pipe end. The movement of the pipe end is all located in the concave space, and will not be squeezed or cut by the rubber ring. None of the above patents involve the sealing of the sealing ring at the clamp fastening bolt. Utility Model Content

[0004] The technical problem solved by the utility model is to provide a sealing ring for groove connection, which is used in conjunction with a clamp and is applied to the groove connection of a high-pressure fluid pipeline, has the advantages of easy installation and good sealing performance.

[0005] The technical solution adopted by the utility model is as follows: the utility model uses a groove connection sealing ring and a clamp to connect steel pipes, including a rubber ring, an elastic half ring, and a sealing ring; the rubber ring and the sealing ring are made of elastic rubber material with an integrated structure, the sealing ring is located in the middle of the inner surface of the rubber ring and is installed at the connection between the two steel pipe end faces, the inner diameter of the sealing ring is no larger than the inner diameter of the steel pipe, and the inner side of the clamp and the groove are beveled to provide extrusion pressure to seal the steel pipe end faces. The elastic half ring is arranged on the outer surface of the rubber ring or fixed inside the rubber ring, and the two elastic half rings are assembled to form a full circle, and the assembled surface of the elastic half ring is consistent with the direction of the preload force of the bolt.

[0006] Furthermore, the elastic half ring is bonded to the outer surface of the rubber ring, which facilitates the installation and connection of the clamp.

[0007] Furthermore, the elastic half rings are in two or more sets, which are evenly distributed in the axial direction of the rubber ring; the assembly surfaces of each set of elastic half rings are staggered, which is beneficial to the sealing of the outer circumferential surface of the steel pipe.

[0008] Furthermore, the rubber ring has a cavity defined within it, corresponding in shape to the rubber ring. The elastic half-ring is positioned within the inner wall of this cavity, acting directly on the outer circumference of the steel pipe through the inner surface of the rubber ring. The inner end surface of the sealing ring has internal openings distributed uniformly around its circumference. These openings connect to the cavity through the inner tube, allowing high-pressure fluid in the pipeline to enter the cavity and seal the outer circumference of the steel pipe. Alternatively, the cavity connects to the outer tube, which extends through the through-hole outside the clamp, allowing high-pressure fluid in the cavity to enter through the outer tube and seal the outer circumference of the steel pipe. In this case, the elastic half-ring can be omitted.

[0009] The beneficial effects of this utility model include: It utilizes dual sealing on both the end face and the outer circumference of the steel pipe, making it suitable for groove connections of high-pressure fluid pipelines. The beveled surfaces of the clamp and the groove cooperate to achieve a squeeze seal on the pipe end. The use of an elastic half-ring eliminates areas where the preload is zero, resulting in a more effective seal on the outer circumference of the steel pipe. This utility model facilitates installation and improves the pass rate of groove connections. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the existing clamp seal installation;

[0011] Figure 2 yes Figure 1 Schematic diagram of the right side;

[0012] Figure 3 Schematic diagram of the installation structure of Example 1;

[0013] Figure 4 yes Figure 3 AA cross-sectional diagram of ;

[0014] Figure 5 This is a schematic diagram of the installation structure of Example 2;

[0015] Figure 6 Schematic diagram of the installation structure of Example 3;

[0016] Wherein: 1-steel pipe, 2-groove, 3-clamp, 4-rubber ring, 5-bolt, 6-elastic half ring, 7-sealing ring, 8-bevel, 9-cavity, 10-inner opening, 11-outer pipe; DETAILED DESCRIPTION

[0017] In the following description, the bolt preload is in the vertical direction as shown in the accompanying drawings. For ease of understanding, the "rubber ring" below refers to the portion that forms a seal with the outer circumference of the steel pipe, the "sealing ring" below refers to the portion that forms a planar seal with the end face of the steel pipe, and the "sealing ring" below refers to both the "rubber ring" and the "sealing ring" as a whole. This utility model uses the term "steel pipe" to describe pipes, but is not limited to pipes made of steel. Example

[0018] The sealing ring and steel pipe installation structure for the groove connection in this embodiment are shown in the attached Figure 3 and attached Figure 4 As shown, the sealing ring is used in conjunction with the clamp 3. The sealing ring comprises a rubber ring 4, an elastic half-ring 6, and a sealing ring 7. The rubber ring 4 and sealing ring 7 are made of elastic rubber and form an integral structure. The sealing ring 7 is located on the inner surface of the center of the rubber ring 4, and its inner diameter is no larger than the inner diameter of the steel pipe. The sealing ring is installed at the junction of the two steel pipe ends and, under the pressure of the steel pipes on both sides of the sealing ring, seals the steel pipe ends. The elastic half-ring 6 is positioned on the outer surface of the rubber ring 4, and the two elastic half-rings 6 are assembled to form a complete circle. The assembly surface of the elastic half-ring 6 should be oriented vertically, aligned with the direction of the bolt preload and perpendicular to the mating surface of the clamp (i.e., the preload component is close to zero). The elastic half-ring is used to adjust the vertical preload of the clamp to a radial direction, ensuring that the pressure on the rubber ring is uniform in the radial direction and the pressure on the rubber ring in the circumferential direction is consistent. This eliminates the phenomenon of zero preload on the rubber ring in the left and right directions, thus ensuring a seal on the outer circumference of the steel pipe.

[0019] In order to provide the force for the end face of the steel pipe to squeeze the sealing ring, the inner mating surface of the clamp and the groove is a bevel 8. When the bolts tighten the clamp and the clamp moves toward the center of the steel pipe, the bevel 8 cooperates to make the end face of the steel pipe move toward the cross-sectional center line of the clamp, that is, move toward the position of the sealing ring, thereby achieving sealing of the end face of the steel pipe.

[0020] During pipeline installation in this embodiment, a guide arc plate or guide piece is arranged between the inner surface of the rubber ring and the outer surface of the steel pipe. The rubber ring is inserted into the joint of the two steel pipes. Since the inner diameter of the sealing ring is not larger than the inner diameter of the steel pipe, the sealing ring is ensured to be installed between the end faces of the two steel pipes. After insertion, the guide arc plate or guide piece is pulled out, and two elastic half-rings are placed on the outer circumference of the rubber ring, with the assembly surfaces of the elastic half-rings facing up and down. Then, the clamp is installed with the arc top of the clamp facing up and down, and the bolts are tightened. When the bolts are tightened, the inclined surface causes the end faces of the steel pipes to move toward each other, and the sealing ring is squeezed and sealed by the end faces of the steel pipe. The elastic half-rings make the radial force on the rubber ring tend to be consistent, and the rubber ring deforms within the space of the clamp, ensuring the sealing of the outer circumference of the steel pipe. The double sealing effect allows the sealing ring of this embodiment to be used for the connection of high-pressure fluid pipelines.

[0021] To facilitate installation, the elastic half ring can be bonded to the outer surface of the rubber ring. When installing, pay attention to the direction of the clamp. This installation method is the same as the installation steps of an ordinary clamp.

[0022] Because the elastic half-ring makes the radial force on the rubber ring uniform in the circumferential direction, the assembly surface of the elastic half-ring is not in the vertical direction, which does not affect the sealing of the rubber ring. Based on this consideration, the elastic half-ring can also be cured inside the rubber ring. However, during installation, it is not advisable to have the assembly surface of the elastic half-ring horizontal, that is, in the same direction as the mating surface of the clamp. In other words, it should not be in the direction where the preload force component is zero.

[0023] Alternatively, two or more sets of elastic half rings are used and evenly distributed in the axial direction of the rubber ring. Each set of elastic half rings is matched to form a full circle. Figure 3 Two sets of elastic half rings are shown. The assembled surfaces of each set of elastic half rings are staggered, which is more conducive to sealing the outer circumference of the steel pipe.

[0024] Since the elastic half ring is used in this embodiment, the tolerances of the other dimensions of the clamp and the groove can be relaxed under the premise that the clamp and the groove inclined surface match well, thereby increasing the product qualification rate of the clamp and the qualification rate of the groove connection. Example

[0025] The sealing ring and steel pipe installation structure of this embodiment are shown in the attached Figure 5 As shown, the sealing ring is used in conjunction with a clamp. The clamp and groove structure are the same as in Example 1, with an inner bevel 8 for matching. The sealing ring includes a rubber ring 4, an elastic half ring 6, and a sealing ring 7. In Example 1, both the rubber ring 4 and the sealing ring 7 were solid. In this embodiment, the rubber ring is hollow, with a cavity 9 provided within the rubber ring 4. Cavity 9 is annular and corresponds to the shape of the rubber ring 4. Internal openings 10 are evenly distributed around the inner end surface of the sealing ring 7, connecting to the cavity 9 through an inner tube. The elastic half ring 6 is arranged on the inner wall of the cavity of the rubber ring, directly acting on the outer circumference of the steel pipe through the inner side of the rubber ring.

[0026] During installation, this embodiment uses a guide arc or blade to insert the rubber ring into the joint of the two steel pipes. Then, the clamp is installed and the bolts are tightened. When high-pressure fluid is transported within the pipeline, it enters the cavity through the inner port and the inner tube. Under the influence of the fluid pressure, the rubber ring expands and deforms within the clamp, sealing the outer circumference of the steel pipe. Although the steel pipe end face squeezes the sealing ring, reducing the cross-sectional area of ​​the inner tube, it does not compress into a thin gap, ensuring that the high-pressure fluid can flow into the cavity. Example

[0027] The sealing ring and steel pipe installation structure of this embodiment are shown in the attached Figure 6As shown, the sealing ring is used in conjunction with a clamp. The clamp and groove structure are the same as in Example 1, with an inner bevel 8 for mating. The sealing ring comprises a rubber ring 4, an elastic half-ring 6, and a sealing ring 7. As in Example 2, a cavity 9 is provided within the rubber ring 4. Cavity 9 is annular, matching the shape of the rubber ring 4. Cavity 9 communicates with an outer tube 11, which extends through a through hole in the clamp and extends outside the clamp. The position of the elastic half-ring 6 is the same as in Example 2.

[0028] The installation method of this embodiment is the same as that of embodiment 2. After installation, high-pressure fluid is injected into the cavity through the outer tube, and the rubber ring expands and deforms in the clamp to seal the outer circumference of the steel tube, and then the outer tube is closed or sealed.

[0029] In this embodiment, since the high-pressure fluid is injected into the cavity before the pipeline transports the high-pressure fluid, the outer circumference of the steel pipe has been sealed, so the elastic half ring can be omitted.

[0030] The utility model adopts a double sealing method of steel pipe end face sealing and outer circumferential surface sealing, which greatly increases the sealing performance of steel pipe joints, and the pipeline can transport high-pressure fluids. The use of elastic half rings eliminates the parts with zero preload force, and the rubber ring seals the circumferential surface more effectively. The utility model adopts the matching of clamps and groove slopes, so that the pipe ends move toward each other, squeezing the sealing ring, and realizing the pressing in CN208719625U. Compared with the existing groove connection, although the utility model has more components, the installation method and steps are the same, and there is no increase in the installation burden. In addition, the utility model can relax the dimensional tolerance of the clamp and improve the qualified rate of the clamp fit.

Claims

1. A sealing ring for groove connection, used in conjunction with a clamp to connect a steel pipe, characterized by: The sealing ring includes a rubber ring, an elastic half ring, and a sealing ring; the rubber ring and the sealing ring are an integrated structure, the sealing ring is located in the middle of the inner surface of the rubber ring and is installed at the connection between the end faces of the two steel pipes, and the inner diameter of the sealing ring is not larger than the inner diameter of the steel pipe; the elastic half ring is arranged on the outer surface of the rubber ring or fixed inside the rubber ring, and the two elastic half rings are assembled into a full circle, and the assembly surface of the elastic half ring is consistent with the pre-tightening force direction of the bolt.

2. A sealing ring for groove connection according to claim 1, characterized in that: The elastic half ring is bonded to the outer surface of the rubber ring.

3. A sealing ring for groove connection according to claim 1, characterized in that: There are more than two sets of elastic half rings, which are evenly distributed in the axial direction of the rubber ring; the assembly surfaces of each set of elastic half rings are staggered with each other.

4. A sealing ring for groove connection according to claim 1, characterized in that: A cavity is provided in the rubber ring, and the cavity corresponds to the shape of the rubber ring; the elastic half ring is provided on the inner wall of the cavity and acts on the outer circumferential surface of the steel pipe directly through the inner side surface of the rubber ring.

5. A sealing ring for groove connection according to claim 4, characterized in that: The inner end surface of the sealing ring is uniformly distributed with inner openings around its circumference, and the inner openings are connected to the cavity through the inner tube.

6. A sealing ring for groove connection according to claim 4, characterized in that: The cavity is communicated with the outer tube, and the outer tube passes through the through hole and extends out of the clamp.

7. A sealing ring for groove connection according to claim 6, characterized in that: The elastic half ring is omitted.

8. The sealing ring for groove connection according to claim 1, characterized in that: The inner sides of the clamp and the groove are matched with each other in an inclined manner.

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