Pipeline interface sealing structure

Abstract

The utility model discloses a pipeline connector sealing structure, and belongs to the technical field of pipeline sealing. The pipeline connector sealing structure comprises a connecting pipe, an elastic hose, a first clamp and a second clamp, the connecting pipe comprises a first connecting pipe section and a second connecting pipe section which are sequentially arranged in the axial direction, and a boss is arranged on the outer wall face of the second connecting pipe section in a protruding mode; the connecting pipe is sleeved with the elastic hose, the elastic hose comprises a first hose section, a second hose section and a third hose section which are sequentially arranged in the axial direction, the first hose section is used for being arranged outside the first connecting pipe section in a sleeving mode, and the second hose section is used for being arranged outside the second connecting pipe section in a sleeving mode and is in interference fit with the boss; the first hoop is used for being arranged outside the first hose section in a sleeving mode and can be shrunk to apply force to the outer wall of the first hose section in the circumferential direction so that the inner wall of the first hose section can be attached to the outer wall of the first pipe connecting section. The second hoop is used for being arranged outside the third hose section in a sleeving mode and can be shrunk to apply force to the outer wall of the third hose section in the circumferential direction. On the premise that effective sealing is formed, the long-term reliability of sealing is better.

Description

Technical Field

[0001] The present application belongs to the technical field of pipeline sealing, and in particular relates to a pipeline interface sealing structure. Background Art

[0002] The sealing of elastic hoses and connecting pipes is usually used in pipeline systems for transporting gas or liquid media. In the process of realizing this application, the inventors found that there are at least the following technical problems in the prior art: In the prior art, a clamp is installed at the contact point between the elastic hose and the connecting pipe. In order to ensure sufficient sealing stress at the connection between the elastic hose and the connecting pipe, the clamp is usually required to provide a large locking force. However, excessive locking force will cause excessive compression of the elastic hose, thereby accelerating the life of the elastic hose and causing leakage at the connection between the elastic hose and the connecting pipe in advance; similarly, too small a locking force will result in insufficient sealing stress margin. As the elasticity of the elastic hose decays, when the pressure of the working medium (liquid or gas) inside the elastic hose increases, the elastic hose expands. After the pressure reaches a certain value, it will also cause leakage at the connection between the elastic hose and the connecting pipe. Utility Model Content

[0003] The present application aims to improve the technical problem in the prior art that leakage occurs at the connection between the elastic hose and the connecting pipe due to the clamp providing an excessively large or insufficient locking force.

[0004] The present application provides a pipeline interface sealing structure, comprising: a connecting pipe, an elastic hose, a first clamp and a second clamp;

[0005] The connecting pipe comprises a first connecting pipe section and a second connecting pipe section which are arranged in sequence in the axial direction, and a boss is provided on the outer wall of the second connecting pipe section;

[0006] An elastic hose is sleeved on the connecting pipe, and the elastic hose includes a first hose segment, a second hose segment, and a third hose segment arranged in sequence axially, the first hose segment being sleeved outside the first connecting pipe segment, and the second hose segment being sleeved outside the second connecting pipe segment and having an interference fit with the boss;

[0007] The first clamp is used to be sleeved outside the first hose section and can be shrunk to apply circumferential force to the outer wall of the first hose section so that the inner wall of the first hose section fits the outer wall of the first connecting pipe section;

[0008] The second clamp is used to be sleeved outside the third hose section and can be shrunk to apply circumferential force to the outer wall of the third hose section.

[0009] According to an embodiment of the present application, the second clamp is sleeved outside the third hose section and is reduced to apply circumferential force to the third hose section so that the inner diameter of the third hose section is equal to the inner diameter of the connecting pipe.

[0010] According to one embodiment of the present application, the connecting pipe also includes: an extension pipe; the first connecting pipe section, the second connecting pipe section and the extension pipe are axially arranged in sequence, the third hose section is sleeved on the outside of the extension pipe, and the second clamp is reduced to apply circumferential force to the outside of the third hose section so that the inner wall of the third hose section fits with the extension pipe.

[0011] According to one embodiment of the present application, a connection limiting plate is connected between the first clamp and the second clamp, and the connection limiting plate is attached to the outer wall of the second hose section.

[0012] According to one embodiment of the present application, the boss is arranged around the circumference of the connecting pipe, and the boss is in a shape with a diameter gradually decreasing from the middle to both ends.

[0013] According to one embodiment of the present application, the first clamp is sleeved on the first hose segment at a position adjacent to the second hose segment; the second clamp is sleeved on the third hose segment at a position adjacent to the second hose segment.

[0014] According to one embodiment of the present application, at least one braided layer is embedded in the inner wall surface of the elastic hose.

[0015] According to one embodiment of the present application, the first hose section and the first connecting pipe section are interference fit.

[0016] According to one embodiment of the present application, a convex ring is convexly provided on the outer wall surface of the connecting pipe, and the convex ring abuts against the end surface of the first hose section.

[0017] According to one embodiment of the present application, the end surface of the first hose section is a plane.

[0018] The above one or more technical solutions in the embodiments of the present application have at least one of the following technical effects:

[0019] The outer wall surface of the connecting pipe of the present application is provided with a boss, and the boss of the connecting pipe is interference fit with the second hose segment, which increases the contact area with the second hose segment while also increasing the local sealing stress and enhancing the local sealing effect; the second clamp applies force to the outer wall of the third hose segment to make the inner diameter of the third hose segment smaller than the inner diameter of the second hose segment, which can effectively resist the expansion of the elastic hose caused by the internal medium pressure, thereby ensuring that the second hose segment is in close contact with the boss of the connecting pipe, that is, the locking force applied by the first clamp to the outer wall surface of the first hose segment can be relatively small. On the premise of ensuring sufficient sealing stress between the contact surface of the boss of the second hose segment and the connecting pipe to form an effective seal, the long-term reliability of the seal is also improved.

[0020] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 This is a schematic structural diagram of a pipeline interface sealing structure provided in an embodiment of the present application;

[0023] Figure 2 This is a cross-sectional view of the pipeline interface sealing structure provided in the first embodiment of the present application before assembly;

[0024] Figure 3 This is a cross-sectional view of the assembled pipeline interface sealing structure provided by the first embodiment of the present application;

[0025] Figure 4 This is a cross-sectional view of the pipeline interface sealing structure provided in the second embodiment of the present application before assembly;

[0026] Figure 5 This is a cross-sectional view of the assembled pipeline interface sealing structure provided by the second embodiment of the present application;

[0027] Figure 6 This is a cross-sectional view of the pipeline interface sealing structure provided in the second embodiment of the present application after a connection limit plate is added.

[0028] Reference numerals:

[0029] 100, connecting pipe; 110, first connecting pipe section; 120, second connecting pipe section; 121, boss; 130, extension pipe; 140, convex ring;

[0030] 200, elastic hose; 210, first hose section; 220, second hose section; 230, third hose section;

[0031] 310, first clamp; 320, second clamp; 330, connection limit plate. DETAILED DESCRIPTION

[0032] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0033] The seal between elastic hoses and connecting pipes is usually used in pipeline systems for transporting gas or liquid media. After long-term use, and under the influence of medium corrosion, pressure shock, light and heat aging, the elastic properties of the elastic hose will decay, which makes the sealing stress at the connection between the elastic hose and the connecting pipe insufficient and prone to leakage.

[0034] In the related art, a clamp is installed on the outer surface of the elastic hose. Since the elastic hose is made of elastic material, such as rubber or elastic plastic, its dimensional accuracy is not high (including the wall thickness and inner diameter and outer diameter of the hose). Under the same clamp size or the same locking force, the sealing stress varies greatly.

[0035] In order to increase the strength of the elastic hose, one or more braided layers are embedded in the elastic hose. This braided layer generally has poor elasticity and will hinder the compression of the elastic hose by the clamp, making it difficult for the clamp's locking force to be transmitted to the contact surface between the elastic hose and the connecting pipe. At the same time, this braided layer will further cause the problem of different sealing stresses between the contact surfaces of different individuals during mass production and delivery.

[0036] In order to ensure the sealing effect and sufficient sealing stress at the connection between the elastic hose and the connecting pipe, the clamp is usually required to provide a large locking force.

[0037] However, excessive tightening force may cause some elastic hoses to be over-compressed, thereby accelerating the lifespan of the elastic hoses and causing premature leakage at the connection between the elastic hoses and the connecting pipes.

[0038] Similarly, too small a locking force will result in insufficient sealing stress margin between some elastic hoses and connecting pipes. As the elasticity of the elastic hose decays, when the pressure of the medium (liquid or gas) inside the elastic hose increases, the elastic hose expands. When the pressure reaches a certain value, it will also cause leakage at the connection between the elastic hose and the connecting pipe.

[0039] Reference below Figures 1-6 The pipeline interface sealing structure according to the embodiment of the present application is described.

[0040] like Figure 1 As shown, the pipeline interface sealing structure includes: a connecting pipe 100 , an elastic hose 200 , a first clamp 310 and a second clamp 320 .

[0041] like Figure 2 and Figure 3 As shown, the connecting pipe 100 includes a first connecting pipe section 110 and a second connecting pipe section 120 which are arranged in sequence in the axial direction. A boss 121 is convexly provided on the outer wall surface of the second connecting pipe section 120 .

[0042] The material selection of the connecting pipe 100 depends on the properties of the medium (such as corrosiveness, etc.). In actual implementation, the connecting pipe 100 can be made of metal materials (such as stainless steel, copper, aluminum alloy, etc.) or high-strength plastic.

[0043] The elastic hose 200 is sleeved on the connecting pipe 100 .

[0044] The material of the elastic hose 200 is also selected depending on the properties of the medium. In actual implementation, the elastic hose 200 can be made of a material with good durability, corrosion resistance, aging resistance and appropriate elasticity (such as rubber, silicone, polyurethane, etc.).

[0045] like Figure 2 and Figure 3 As shown, the elastic hose 200 includes a first hose segment 210, a second hose segment 220 and a third hose segment 230 arranged axially in sequence. The first hose segment 210 is used to be sleeved outside the first connecting pipe segment 110, and the second hose segment 220 is used to be sleeved outside the second connecting pipe segment 120 and interference fit with the boss 121.

[0046] The first clamp 310 is used to be sleeved outside the first hose section 210 and can be shrunk to apply circumferential force to the outer wall of the first hose section 210 so that the inner wall of the first hose section 210 fits the outer wall of the first connecting pipe section 110 .

[0047] The second clamp 320 is used to be sleeved outside the third hose section 230 and can be reduced to apply circumferential force to the outer wall of the third hose section 230 .

[0048] In this embodiment, the second clamp 320 applies force to the outer wall of the third hose segment 230 so that the inner diameter of the third hose segment 230 is smaller than the inner diameter of the second hose segment 220. When the elastic hose 200 expands due to increased medium pressure, the third hose segment 230 can resist the expansion of the elastic hose 200, ensuring that the second hose segment 220 is in close contact with the boss 121 of the connecting pipe 100.

[0049] That is, the locking force applied by the first clamp 310 to the outer wall of the first hose section 210 can be relatively small, and the stress borne by the contact surface between the first hose section 210 and the first connecting pipe section 110 of the connecting pipe 100 is within the safe stress range of the material.

[0050] In addition, the boss 121 of the connecting pipe 100 is interference fit with the second hose section 220, which increases the contact area with the second hose section 220 while also increasing the local sealing stress, enhancing the local sealing effect, and reducing the requirement for applying locking force to the first clamp 310 and the second clamp 320.

[0051] That is to say, under the joint action of the first clamp 310 and the second clamp 320, sufficient sealing stress can be ensured between the contact surface of the second hose section 220 and the boss 121 of the connecting pipe 100, forming an effective seal and improving the long-term reliability of the seal.

[0052] In summary, the outer wall surface of the pipe 100 of the present application is convexly provided with a boss 121, and the boss 121 of the pipe 100 is interference fit with the second hose segment 220, which increases the contact area with the second hose segment 220 while also increasing the local sealing stress and enhancing the local sealing effect; the second clamp 320 applies force to the outer wall of the third hose segment 230, so that the inner diameter of the third hose segment 230 is smaller than the inner diameter of the second hose segment 220, which can resist the expansion of the elastic hose 200 caused by the internal medium pressure, thereby ensuring that the second hose segment 220 is in close contact with the boss 121 of the pipe 100, that is, the locking force applied by the first clamp 310 to the outer wall surface of the first hose segment 210 is relatively small. While ensuring sufficient sealing stress between the contact surface of the second hose segment 220 and the boss 121 of the pipe 100 to form an effective seal, the long-term reliability of the seal is also improved.

[0053] In actual implementation, the first hose section 210 and the connecting pipe 100 are interference fit.

[0054] In this embodiment, since the first hose section 210 is sleeved on the connecting pipe 100, deformation will occur due to the initial interference fit, which can appropriately reduce the locking force applied by the first clamp 310, thereby further improving the long-term reliability of the seal while ensuring the sealing effect.

[0055] It should be noted that the interference fit between the first hose section 210 and the connecting pipe 100 should be determined according to the medium pressure and the performance indicators of the elastic hose 200 itself (pressure bearing capacity, aging resistance, chemical stability, etc.), and this embodiment does not impose any specific restrictions.

[0056] like Figure 2 and Figure 3 As shown, in some embodiments, the inner diameter of the first hose section 210 of the elastic hose 200 is not less than the inner diameter of the third hose section 230 of the elastic hose 200 .

[0057] The pipeline interface sealing structure can be at least one of the following structural forms:

[0058] First, as Figure 4 and Figure 5 As shown, the inner diameter of the first hose section 210 is equal to the inner diameter of the third hose section 230 ; the pipeline interface sealing structure further includes: an extension tube 130 .

[0059] The extension tube 130 is another tube independent of the connecting pipe 100 and is axially connected to the end of the connecting pipe 100 . The third hose section 230 is sleeved on the extension tube 130 , and the inner diameter of the first hose section 210 is equal to the inner diameter of the third hose section 230 .

[0060] In this embodiment, the extension tube 130 is axially connected to the end of the connecting pipe 100 , so that the third hose section 230 is supported, and at the same time, the second clamp 320 applies force to the outer wall of the third hose section 230 .

[0061] That is, the areas where the first hose section 210 and the third hose section 230 contact the connecting pipe 100 and the area where the second hose section 220 contacts the boss 121 can form sealing surfaces to form an effective seal.

[0062] Second, if Figure 2 and Figure 3 As shown, the inner diameter of the first hose section 210 is larger than the inner diameter of the third hose section 230 .

[0063] The second clamp 320 is sleeved on the outside of the third hose section 230 and is reduced to apply circumferential force to the third hose section 230 so that the inner diameter of the third hose section 230 is equal to the inner diameter of the connecting pipe 100 .

[0064] In this embodiment, since the third hose segment 230 cannot be supported, when the second clamp 320 applies force to the outer wall of the third hose segment 230, the third hose segment 230 will produce an appropriate amount of elastic compression, so that the inner diameter of the third hose segment 230 is smaller than the inner diameter of the first hose segment 210.

[0065] Compared with the first embodiment, the locking force applied by the second clamp 320 is more controllable, the elastic permanent deformation of the third hose section 230 is smaller, and the long-term reliability of the seal is also better while ensuring effective sealing.

[0066] It should be noted that the inner wall surface of the elastic hose 200 may be embedded with at least one braided layer, which can increase the strength of the elastic hose 200 and make the elastic hose 200 more stable when facing internal medium pressure or other external forces.

[0067] However, due to the low elasticity of the braided layer, the clamping force applied by the clamp is difficult to fully transmit to the contact surface between the elastic hose 200 and the connecting pipe 100. Therefore, to ensure sufficient sealing stress, a higher clamping force is generally required. However, excessive clamping force can easily lead to excessive compression of the elastic hose 200, causing plastic deformation and shortening the service life of the elastic hose 200.

[0068] In the second embodiment, the locking force applied by the second clamp 320 is controllable, and the influence of the braided layer is reduced. When the elastic hose 200 expands due to the increase in medium pressure, the design of the inner diameter of the third hose segment 230 being smaller than that of the second hose segment 220 can effectively resist the expansion of the elastic hose 200. This can make the locking force applied by the first clamp 310 to the outer wall of the first hose segment 210 relatively small, that is, while ensuring sufficient sealing stress between the first hose segment 210 and the second hose segment 220 to form an effective seal, the long-term reliability of the seal is better.

[0069] In actual implementation, the first clamp 310 is sleeved on the first hose section 210 adjacent to the second hose section 220 ; the second clamp 320 is sleeved on the third hose section 230 adjacent to the second hose section 220 .

[0070] like Figure 6 As shown, in some embodiments, a connection limiting piece 330 is connected between the first clamp 310 and the second clamp 320 , and the connection limiting piece 330 is attached to the second hose section 220 .

[0071] In this embodiment, the connection limit plate 330 can ensure that the distance between the first clamp 310 and the second clamp 320 does not change, and can prevent the first clamp 310 and the second clamp 320 from loosening or displacement during long-term use or high-pressure environment, thereby affecting the sealing effect.

[0072] In actual implementation, the boss 121 is disposed around the circumference of the connecting pipe 100 ; and / or the first clamp 310 and the second clamp 320 are disposed around the circumference of the elastic hose 200 .

[0073] like Figure 6 As shown, in actual implementation, a convex ring 140 is convexly provided on the outer wall surface of the connecting pipe 100 , and the convex ring 140 abuts against the end surface of the first hose section 210 .

[0074] This design, on the one hand, prevents the elastic hose 200 from moving away from the end of the connecting pipe 100, thereby improving the long-term stability of the connection between the elastic hose 200 and the connecting pipe 100; on the other hand, it serves as a positioning reference point during installation to determine the area where the first hose section 210 of the elastic hose 200 is pressed against the connecting pipe 100.

[0075] In actual implementation, the end surface of the first hose section 210 is a plane.

[0076] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0077] In the description of this application, it should be understood that the terms "length", "width", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0078] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0079] In the description of this application, “plurality” means two or more.

[0080] In the description of the present application, a first feature being “on” or “under” a second feature may include the first and second features being in direct contact with each other, or the first and second features being in contact with each other not directly but via another feature therebetween.

[0081] In the description of this application, a first feature “on”, “above” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0082] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0083] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A pipeline interface sealing structure, characterized in that: include: A connecting pipe, an elastic hose, a first clamp and a second clamp; A connecting pipe, the connecting pipe comprising a first connecting pipe section and a second connecting pipe section arranged in sequence in the axial direction, wherein the outer wall surface of the second connecting pipe section is provided with a boss; an elastic hose, sleeved on the connecting pipe, the elastic hose comprising a first hose segment, a second hose segment, and a third hose segment arranged axially in sequence, the first hose segment being sleeved outside the first connecting pipe segment, the second hose segment being sleeved outside the second connecting pipe segment and having an interference fit with the boss; a first clamp, which is used to be sleeved outside the first hose section and can be shrunk to apply circumferential force to the outer wall of the first hose section so that the inner wall of the first hose section fits the outer wall of the first connecting pipe section; The second clamp is used to be sleeved outside the third hose section and can be shrunk to apply circumferential force to the outer wall of the third hose section.

2. The pipeline interface sealing structure according to claim 1, characterized in that: The second clamp is sleeved outside the third hose section and is shrunk to exert circumferential force on the third hose section so that the inner diameter of the third hose section is equal to the inner diameter of the connecting pipe.

3. The pipeline interface sealing structure according to claim 1, characterized in that: The connecting pipe also includes: an extension pipe; the first connecting pipe section, the second connecting pipe section and the extension pipe are axially arranged in sequence, the third hose section is sleeved on the outside of the extension pipe, and the second clamp is reduced to apply circumferential force to the outside of the third hose section so that the inner wall of the third hose section fits with the extension pipe.

4. The pipeline interface sealing structure according to claim 1, characterized in that: A connection limiting piece is connected between the first clamp and the second clamp, and the connection limiting piece is attached to the outer wall of the second hose section.

5. The pipeline interface sealing structure according to claim 1, characterized in that: The boss is arranged around the circumference of the connecting pipe, and the boss is in a shape with a diameter gradually decreasing from the middle to both ends.

6. The pipeline interface sealing structure according to claim 1, characterized in that: The first clamp is sleeved on the first hose section at a position adjacent to the second hose section; the second clamp is sleeved on the third hose section at a position adjacent to the second hose section.

7. The pipeline interface sealing structure according to claim 1, characterized in that: At least one braided layer is embedded in the inner wall surface of the elastic hose.

8. The pipeline interface sealing structure according to any one of claims 1 to 7, characterized in that: The first hose section and the first connecting pipe section are interference fit.

9. The pipeline interface sealing structure according to any one of claims 1 to 7, characterized in that: A convex ring is convexly provided on the outer wall surface of the connecting pipe, and the convex ring abuts against the end surface of the first hose section.

10. The pipeline interface sealing structure according to claim 9, characterized in that: The end surface of the first hose section is a plane.

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