Pipeline connecting structure

Abstract

The utility model discloses a pipeline connecting structure. The technical problem that an existing flange connecting mode is poor in sealing reliability is solved. The inner edge of the pipe fitting is provided with a bearing table, the end face of the pipe fitting is provided with a flange plate, one end of the pipe is inserted into the pipe fitting, and the pipe abuts against the bearing table; the inner edge of the end of the pipe fitting is provided with a sealing table which is gradually shrunk in the pipe inserting direction. The outer edge of the pipe is sleeved with a flange cover matched with the flange plate, a locking ring locked between the flange cover and the sealing table and a sealing ring. The locking ring is provided with a reserved opening, and a plurality of ribs are arranged on the inner edge of the locking ring in an array mode. The locking ring comprises a ring cone part, and a pressing part attached to the inclined face of the ring cone part is arranged at the position, corresponding to the end, of the flange cover. The end face, used for being attached to the sealing table, of the sealing ring is of a corresponding reducing structure. The connecting structure can ensure the sealing performance of the connection between the pipe fitting and the pipe, shield a certain degree of external force or vibration interference, and improve the connection reliability.

Description

Technical Field

[0001] The present application relates to the technical field of water supply and drainage engineering, and in particular to a pipeline connection structure. Background Art

[0002] During the construction of water supply and drainage projects, it is necessary to connect the prefabricated pipe sections into a complete system according to the requirements of the design drawings. Among them, threaded connection, bonding or hot melt connection are generally used for the connection of plastic pipes / parts. However, compared with other connection methods, threaded connection has lower pressure bearing capacity and is relatively difficult to disassemble; when using bonding connection, its bonding strength is affected by various factors such as temperature and humidity, and if there are bubbles or gaps during the bonding process, it may cause leakage at the connection; for the most commonly used hot melt connection for plastic pipes / parts, it has higher requirements on the melting point and melt index of the material, and the connection parameters vary depending on the material. In addition, there may be problems with low fusion density and connection strength during the fusion process, which is a false weld with poor connection security.

[0003] In addition, the inventors also know a flange connection structure, which is to fix two pipes or pipes and pipe fittings on a flange plate respectively, then add a flange gasket between the two flange plates, and finally tighten them with bolts to make them tightly combined. The flange connection uses bolt pre-tightening to compact the flange gasket between the flange plates and fill the uneven gaps on the flange sealing surface, thereby preventing the medium from penetrating through the capillary pores inside the gasket or leaking from the interface between the flange gasket and the sealing surface. However, the installation requirements of the flange connection are relatively high, and the verticality and flatness of the flange connection must be ensured, otherwise it will affect the sealing performance, and after being subjected to external force or vibration, the connection part will be deformed or displaced, affecting the normal operation of the pipeline system and causing leakage.

[0004] The information disclosed in this background technology section is only used to deepen the understanding of the background technology of the present disclosure, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art known to those skilled in the art. Summary of the invention

[0005] In view of at least one of the above technical problems, the present disclosure provides a pipeline connection structure, aiming to solve the technical problem of poor sealing reliability of the existing flange connection method.

[0006] According to one aspect of the present disclosure, there is provided a pipeline connection structure, comprising a pipe fitting having a receiving platform on the inner edge and a flange on the end face, and a pipe material having one end inserted in the pipe fitting and abutting against the receiving platform; a sealing platform which gradually shrinks along the insertion direction of the pipe material is provided at the inner edge of the end head of the pipe fitting; a flange cover which matches the flange, a locking ring and a sealing ring which are locked between the flange cover and the sealing platform are sleeved on the outer edge of the pipe material, the locking ring is provided with a reserved opening and a plurality of ribs are provided in an inner edge array; the locking ring comprises an annular cone portion, and a pressing portion which fits with the inclined surface of the annular cone portion is provided at the corresponding end head of the flange cover; the end face of the sealing ring which fits with the sealing platform is a corresponding reducing structure.

[0007] Thus, through the pre-tightening effect between the flange and the flange cover, the pressing part presses the locking ring. After the locking ring is subjected to the pressure transmitted by the pressing part, the locking ring with a reserved opening shrinks by using the cooperation of the inclined surface between the pressing part and the cone of the locking ring, so that the ribs on the inner edge of the locking ring can be used to hold the pipe tightly, thus preventing the pipe from detaching during use. In addition, the reduced diameter structure of the sealing ring and the sealing platform can increase the contact area between the two, thereby improving the sealing effect.

[0008] In some embodiments of the present disclosure, the receiving platform is in a reduced diameter shape along the insertion direction of the pipe; thereby facilitating demoulding during the production of the pipe fittings and avoiding the generation of cavities at the corners during injection molding.

[0009] In some embodiments of the present disclosure, the clamping portion protrudes from the corresponding end face of the flange cover by a certain height, and is used to be inserted into the pipe fitting accordingly; thereby, the flange structure is limited and strengthened by inserting the clamping portion into the pipe fitting, thereby preventing the flange connection strength from being affected by external force or vibration.

[0010] In some embodiments of the present disclosure, the locking ring also includes an annular platform portion whose outer edge diameter is larger than the maximum outer edge diameter of the annular cone portion; the extrusion force of the flange cover clamping portion can be evenly and effectively transmitted to the sealing ring through the annular platform portion, thereby causing the sealing ring to deform evenly, thereby ensuring the sealing reliability.

[0011] In some embodiments of the present disclosure, the end face of the sealing ring used to fit with the locking ring has a corresponding thickness, and the outer edge of the end side fits correspondingly with the inner edge of the pipe fitting; on the one hand, a sealing ring with a certain thickness can improve its deformation characteristics and expand the deformation range, thereby achieving a better seal; on the other hand, since the outer edge of the other end side of the sealing ring is in contact with the inner edge of the pipe fitting, it helps to further expand the contact area between the sealing ring and the pipe fitting, thereby improving the sealing effect and reliability.

[0012] In some embodiments of the present disclosure, the depth of the sealing platform is smaller than the sum of the corresponding heights of the sealing ring, the locking ring and the clamping portion; thereby avoiding the problem that after the flange plate and the flange cover are tightly pressed together, the sealing ring is not subjected to sufficient extrusion pressure and is unable to produce the desired deformation, thereby affecting the sealing effect.

[0013] In some embodiments of the present disclosure, the flange plate and the flange cover include a plurality of bolt holes in an equiangular circular array; each bolt hole is arranged corresponding to the equiangular array, which can ensure that the flange cover finally applies uniform extrusion force to the sealing ring and the locking ring, avoiding affecting the tightening of the locking ring and the sealing effect of the sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional schematic diagram of a pipeline connection structure in one embodiment of the present application.

[0015] Figure 2 Schematic diagram of the structure of a pipe in one embodiment of the present application.

[0016] Figure 3 Schematic diagram of the structure of the flange cover in one embodiment of the present application.

[0017] Figure 4 Schematic diagram of the structure of a sealing ring in one embodiment of the present application.

[0018] Figure 5 Schematic diagram of the structure of a locking ring in one embodiment of the present application.

[0019] Figure 6 This is a schematic diagram of the use status of the pipe connection structure in one embodiment of the present application.

[0020] In the above figures, 1 is a pipe fitting, 11 is a flange, 2 is a pipe material, 3 is a receiving platform, 4 is a flange cover, 41 is a clamping part, 5 is a sealing platform, 6 is a sealing ring, 7 is a locking ring, 71 is a rib, 72 is a reserved opening, 73 is a ring cone part, and 74 is a ring platform part. DETAILED DESCRIPTION

[0021] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "vertical", "horizontal", "clockwise", "counterclockwise", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present 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, and therefore should not be understood as a limitation on the present application.

[0022] In order to better understand the technical solution of the present application, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] In order to solve the problem of poor sealing effect of existing pipeline flange connection, this example discloses a pipeline connection structure, see Figure 1 , which includes a pipe 2 to be connected and a pipe fitting 1 provided at the end of the pipe 2 for connecting two sections of the pipe. In this example, a 45-degree elbow is used as the pipe fitting.

[0024] For more information, see Figure 1 In this embodiment, in order to ensure the connection reliability between the pipe 2 and the pipe fitting 1, a receiving platform 3 is provided at the inner edge of the pipe fitting 1. The inner edge diameter of the receiving platform 3 is between the outer diameter and the inner diameter of the pipe 2, so that after the pipe 2 is inserted into the pipe fitting 1, the insertion depth of the pipe 2 is limited, thereby ensuring the control of the connection quality between the two, thereby avoiding the problem of different pipe insertion depths due to human operation factors, which leads to differences in connection reliability.

[0025] In this embodiment, the receiving platform 3 is tapered along the insertion direction of the pipe 2, thereby facilitating the demolding of the pipe fitting 2 after injection molding and avoiding the generation of cavities at the right angle between the receiving platform and the inner wall of the pipe fitting during injection molding, thereby affecting the quality of the pipe fitting.

[0026] In order to realize the flange connection between pipes, and considering that the pipe 2 needs to be cut into different lengths according to the needs of the actual construction scene, in order to avoid limiting the pipe end structure, in this embodiment, see Figure 2 , a flange 11 is fixedly arranged at the end face of the pipe fitting 1, see Figure 3 , and a flange cover 4 matching the flange plate 11 is movably mounted outside the pipe 2, thereby pre-tightening the bolts between the flange cover 4 and the flange plate 11 to achieve the connection between the pipe fitting 1 and the pipe 2.

[0027] However, in order to prevent the flange cover 4 from falling off from the pipe 2, thereby causing the connection between the pipe 2 and the pipe fitting 1 to fail; and to ensure the sealing effect of the connection between the pipe fitting 1 and the pipe 2 after the connection, in this embodiment, see Figures 1 to 5 A sealing platform 5 is arranged at the inner edge of the end of the pipe fitting 1, and a sealing ring 6 and a locking ring 7 are tightly arranged between the sealing platform 5 and the flange cover 4, thereby achieving a sealing effect through the sealing ring 6, and achieving a clamping effect on the pipe 2 through the locking ring 7.

[0028] For details, see Figure 2After the pipe fitting 1 and the pipe material 2 are correspondingly plugged in, there is a gap between the inner wall of the pipe fitting 1 and the outer wall of the pipe material 2, which poses a risk of leakage. Therefore, a sealing platform 5 is provided at the inner edge of the pipe fitting 1 between the receiving platform 3 and the flange 11, thereby providing space for the installation of the sealing ring 6 and the locking ring 7, thereby achieving the corresponding effect of sealing and holding the pipe material.

[0029] The sealing ring 6 is fitted with the sealing platform 5. The sealing ring 6 is made of rubber. When the flange cover 4 and the flange plate 11 are pre-tightened by bolts, the pressure generated is transmitted to the sealing ring 6 through the locking ring 7, causing the sealing ring 6 to deform, thereby filling the gap between the pipe 1 and the pipe 2 to achieve a sealing effect. In this embodiment, in order to ensure the reliability of the seal, the sealing platform 5 is provided with a reduced diameter structure along the pipe insertion direction, so that the surface of the sealing platform 5 is an inclined surface. Correspondingly, the end surface of the sealing ring 6 used to fit with the sealing platform 5 is a reduced diameter structure that matches the inclined surface of the sealing platform. Therefore, through the fit between the reduced diameter structures, the contact area between the pipe sealing platform 5 and the sealing ring 6 can be effectively expanded, so that the sealing path can be extended, thereby achieving the purpose of improving the sealing effect. In addition, in this embodiment, in order to further improve the sealing effect of the sealing ring 6, the sealing ring 6 is provided with a certain thickness for the end surface of the locking ring 7, and the outer edge of the end side is in close contact with the inner edge of the pipe 1, thereby further improving the deformation range of the sealing ring and extending the sealing path, thereby achieving a better sealing effect.

[0030] The locking ring 7 is used to achieve the clamping and limiting of the pipe 2 on the one hand, and to transfer the pre-tightening force to the sealing ring 6 on the other hand, so that the sealing ring 6 is deformed to achieve the sealing effect. In order to ensure that the sealing ring can be deformed evenly under force, in this example, the end faces of the sealing ring 6 and the locking ring 7 in contact are respectively planes, thereby expanding the force-bearing area, so that the pre-tightening force can be more effectively transferred through the locking ring 7, so that the sealing ring 6 is deformed evenly to ensure the sealing effect of the annular gap between the pipe fitting and the pipe.

[0031] In addition, see Figure 5 In order to ensure that the locking ring 7 can effectively hold the pipe 2, a plurality of ribs 71 are arranged in an array on the inner edge of the locking ring 7. The ribs 71 increase the holding force between the locking ring 7 and the pipe 2. In this example, the arrangement direction of the ribs 71 is set at an angle to the insertion direction of the pipe, thereby increasing the friction between the locking ring 7 and the pipe 2 and ensuring the holding effect.

[0032] Considering that the locking ring 7 is sleeved outside the pipe 2, in order to ensure the convenience of assembly, the locking ring 7 cannot be tightly fitted between the pipe 2, which conflicts with the requirement that the locking ring 7 holds the pipe 2 tightly. Figure 5The locking ring 7 is provided with a reserved opening 72, so that the locking ring 7 can be deformed to a certain extent when assembled to the outside of the pipe 2, thereby facilitating assembly. In order to ensure that the locking ring 7 can reliably hold the pipe 2 after the flange cover 4 and the flange plate 11 are pre-tightened with bolts, and to avoid the locking ring 7 being loosened due to the reserved opening 72, see Figure 1 and Figure 5 , the locking ring 7 includes a ring cone 73, corresponding to, see Figure 3 A clamping portion 41 that tightly fits with the annular cone portion 73 is provided on the end side of the flange cover 4 for clamping the locking ring 7. Through the sliding fit between the outer inclined surface of the annular cone portion 73 and the inner inclined surface of the clamping portion 41, as the preload force at the flange cover 4 gradually increases, the inclined surface of the clamping portion 41 gradually moves along the inclined surface of the annular cone portion 73 of the locking ring, thereby gradually reducing the opening of the reserved opening 72. The locking ring 7 thus gradually realizes a clamping effect on the pipe 2, and at the same time gradually compresses the sealing ring 6 to achieve a good sealing effect.

[0033] Among them, in this embodiment, see Figure 1 and Figure 3 The clamping portion 41 protrudes from the corresponding end surface of the flange cover 4 by a certain height, so that the clamping portion 41 can be inserted into the pipe 1, so that the pipe 1 can limit the flange cover 4 to a certain extent, so as to increase the connection strength between the two and avoid the flange connection displacement caused by external force or vibration, which affects the reliability of the flange connection. In some other embodiments, the end surface of the clamping portion is flush with the end surface of the flange cover.

[0034] In addition, in order to increase the contact area between the locking ring 7 and the sealing ring 6 as much as possible, so that the sealing ring 6 can be deformed as evenly as possible to improve the sealing effect, in this embodiment, see Figure 5 The locking ring 7 also includes a ring platform portion 74, the outer edge diameter of the ring platform portion 74 is larger than the maximum diameter of the ring cone portion 73, and the end face of the ring platform portion 74 is in contact with the sealing ring 6, thereby increasing the contact area between the two, and transmitting the extrusion force of the flange cover clamping portion to the sealing ring 6 more evenly and effectively, thereby causing the sealing ring 6 to undergo relatively uniform deformation, thereby ensuring the sealing reliability.

[0035] In this embodiment, see Figure 6 The depth of the sealing platform 5 is set to be smaller than the sum of the heights of the sealing ring 6, the locking ring 7 and the pressing part after they are matched, so that after the flange cover 4 is pressed against the locking ring 7 and the sealing ring 6, a certain gap is left between the flange cover 4 and the flange plate 11, thereby avoiding the problem that the sealing platform is too deep, so that after the flange plate 11 limits the flange cover 4, the locking ring 7 is not locked in place, and the sealing ring 6 is not subjected to sufficient extrusion force and does not produce sufficient deformation, thereby affecting the connection strength and sealing effect.

[0036] In addition, to ensure that the flange cover 4 uniformly squeezes the locking ring 7, thereby causing the sealing ring 6 to deform uniformly, in this embodiment, the flange 11 and the flange cover 4 include four bolt holes in an equal-angle circular array, and each bolt hole is arranged corresponding to the equal-angle array. When pre-tightening, the bolts are arranged diagonally in sequence, thereby ensuring that the flange cover finally uniformly squeezes the sealing ring and the locking ring, avoiding affecting the tightening of the locking ring and the sealing effect of the sealing ring. In some other embodiments, the flange and the flange cover are provided with at least three bolt holes in other numbers in an equal-angle array corresponding to the pipe diameter.

[0037] Although some preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0038] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A pipeline connection structure, characterized in that: It comprises a pipe fitting with a receiving platform on the inner edge and a flange on the end face, and a pipe material with one end inserted into the pipe fitting and abutting against the receiving platform; a sealing platform which gradually shrinks along the insertion direction of the pipe material is provided at the inner edge of the end head of the pipe fitting; a flange cover matching the flange plate, a locking ring and a sealing ring locked between the flange cover and the sealing platform are sleeved on the outer edge of the pipe material, the locking ring is provided with a reserved opening and a plurality of ribs are provided in an inner edge array; The locking ring comprises an annular cone portion, and a pressing portion which fits with the inclined surface of the annular cone portion is provided at the corresponding end of the flange cover; the end surface of the sealing ring which fits with the sealing platform is a corresponding reduced diameter structure.

2. The pipeline connection structure according to claim 1, characterized in that: The receiving platform is in a shape of reduced diameter along the pipe inserting direction.

3. The pipeline connection structure according to claim 1, characterized in that: The clamping portion protrudes from the corresponding end surface of the flange cover by a certain height and is used for corresponding insertion into the pipe fitting.

4. The pipeline connection structure according to claim 3, characterized in that: The locking ring also includes an annular platform portion whose outer edge diameter is larger than the maximum outer edge diameter of the annular cone portion.

5. The pipeline connection structure according to claim 1 or 3, characterized in that: The end face of the sealing ring used to fit with the locking ring has a corresponding thickness, and the outer edge of the end side fits with the inner edge of the pipe fitting accordingly.

6. The pipeline connection structure according to claim 1, characterized in that: The depth of the sealing platform is less than the sum of the corresponding heights of the sealing ring, the locking ring and the pressing part.

7. The pipeline connection structure according to claim 1, characterized in that: The flange plate and flange cover include a plurality of bolt holes in an equiangular circumferential array.

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