A flange joint

Abstract

A flange joint includes a first pipe joint and a second pipe joint. Flange mounting parts are respectively provided on the peripheries of the two pipe joints, and the two flange mounting parts are fixedly connected by fasteners to achieve restriction of radial or circumferential movement between the pipe joints. Sealing grooves are also respectively provided at the ends of the two pipe joints, and gaskets are provided between the two sealing grooves to achieve sealing of the pipe joints. A positioning ring is also respectively provided on the inner ring of each sealing groove, and the two abut against each other to protect the sealing ring from direct contact with the medium circulating in the joint. The present invention has a simple structure. Through the design of the internal structure of the pipe joint, the present invention can achieve fixed connection between the pipe joints only by fasteners, and can effectively limit the relative movement between the pipe joint structures, and can also effectively protect the gaskets and extend their service life.

Description

Technical Field

[0001] The invention relates to the field of train parts, and in particular to a flange joint. Background Art

[0002] The pipes on the vehicle need to be connected through pipe connectors. The existing pipe connectors are only sealed at the connection parts through threads and sealing washers.

[0003] The existing sealing method between pipelines on trains has the following problems:

[0004] 1. During the operation of the train, there is high-frequency vibration in the working environment of the pipeline on the train. The vibration acts on the mechanical structures such as the pipeline and pipe joints, which will squeeze the sealing gasket inward accordingly, causing mechanical fatigue and easy damage, thus losing the sealing effect;

[0005] 2. The upper frequency vibration during the operation of the train directly acts on the pipe connectors, which can easily cause radial movement between the pipe connectors, resulting in loose threads, loose connections between the pipe connectors, and leakage of the medium in the pipeline.

[0006] 3. The joint structure provided in our company's prior application No. 2019109363681 can limit the radial movement between pipe joints, but its structure is relatively complex. During installation, the positioning component and the limit device need to be respectively sleeved on the outer periphery of the joint component, and the positioning component needs to be pressed to tighten the bolts in the joint component. In use, although the structure has good fixing and sealing effects, it is easily restricted by the narrow installation environment and is inconvenient to install. Summary of the invention

[0007] The present invention aims at the deficiencies of the prior art and provides a flange joint, which restricts the relative rotation of the pipe joint structure through the connection between the fastener and the flange, ensures uniform fastening between the pipe joint structures, and protects the gaskets arranged inside the pipe joint structure. The present invention specifically adopts the following technical solutions.

[0008] Firstly, to achieve the above-mentioned purpose, a flange joint is proposed, which includes: a first pipe connection, one end of which is provided with a first sealing groove; a second pipe connection, one end of which is provided with a second sealing groove; a gasket, both end surfaces of which are respectively provided with a first protrusion and a second protrusion, which respectively abut against the first sealing groove and the second sealing groove; a first flange mounting member, which is arranged on the outer periphery of the first pipe connection; a second flange mounting member, which is arranged on the outer periphery of the second pipe connection; and the first flange mounting member and the second flange mounting member are tightly fitted and connected.

[0009] Optionally, the above-mentioned flange joint is characterized in that the cross-sectional shape of the first sealing groove is different from the cross-sectional shape of the second sealing groove; the cross-sectional shape of the first protrusion is different from the cross-sectional shape of the second protrusion.

[0010] Optionally, the above-mentioned flange joint is characterized in that the cross-sectional shape of the first sealing groove is the same as the cross-sectional shape of the second sealing groove; the cross-sectional shape of the first protrusion is the same as the cross-sectional shape of the second protrusion.

[0011] Optionally, the above-mentioned flange joint is characterized in that at least three first mounting through holes are provided on the first flange mounting member, and at least three second mounting through holes are provided on the second flange mounting member, and the first mounting through holes are respectively provided correspondingly to the second mounting through holes; the first flange mounting member and the second flange mounting member are fixedly connected through the first mounting through holes and the second mounting through holes.

[0012] Optionally, the above-mentioned flange joint is characterized in that the flange joint also includes: a positioning outer ring, which is arranged at the end of the first pipe joint and located inside the first sealing groove; a positioning inner ring, which is arranged at the end of the second pipe joint and located inside the second sealing groove; the positioning inner ring is installed inside the positioning outer ring.

[0013] Optionally, the above-mentioned flange joint is characterized in that the outer circumferential surface of the positioning inner ring is fitted onto the inner circumferential surface of the positioning outer ring.

[0014] Optionally, the above-mentioned flange joint is characterized in that the flange joint also includes: a limiting outer ring, which is arranged at the end of the first pipe connection and is located outside the first sealing groove; a limiting inner ring, which is arranged at the end of the second pipe connection and is located outside the second sealing groove; the limiting inner ring is installed inside the limiting outer ring.

[0015] Optionally, the above-mentioned flange joint is characterized in that the outer circumferential surface of the limiting inner ring is in contact with the inner circumferential surface of the limiting outer ring.

[0016] Optionally, the above-mentioned flange joint is characterized in that when the top end of the limiting inner ring abuts against the inner bottom surface of the limiting outer ring, the compression distance of the gasket is within the non-destructive extrusion range.

[0017] Optionally, the above-mentioned flange joint is characterized in that the inner circumference of the positioning outer ring is truncated cone-shaped, and the outer circumference of the positioning inner ring is truncated cone-shaped.

[0018] Beneficial Effects

[0019] The present invention is connected and fixed by two flange mounting parts respectively arranged on the periphery of the first pipe connection and the second pipe connection. Specifically, the present invention can evenly fix the two flange mounting parts through a simple fastener structure to achieve the restriction of the relative radial or circumferential movement between the pipe connections. Compared with the existing threaded fasteners integrally sleeved on the outer ring of the pipe connection, this fixing method can evenly fix the pipe connection through fasteners distributed around the flange mounting parts, avoid local squeezing of the pipe connection caused by thread misalignment, and avoid squeezing the gasket inside the pipe connection to cause deformation and damage of the gasket.

[0020] Furthermore, in the present invention, the ends of the two pipe joints are also provided with sealing grooves, and a gasket is provided between the two sealing grooves to achieve sealing of the pipe joint. The inner ring of each sealing groove is also provided with a positioning ring, and the two abut against each other to protect the sealing ring from directly contacting the medium flowing in the joint. In the two pipe joints, the limiting outer ring provided on the outer ring of the sealing groove can limit the depth of the positioning inner ring inserted into the positioning outer ring through the mutual abutment relationship between the two, and limit the extrusion force on the internal gasket. The present invention has a simple structure. Through the design of the internal structure of the pipe joint, the present invention can achieve a fixed connection between the pipe joints only through fasteners, and can effectively limit the relative movement between the pipe joint structures, and can also effectively protect the gasket and extend its service life.

[0021] Furthermore, the present invention sets the outer periphery of the end of the positioning inner ring to have an arc, and the arc cooperates with the arc of the inner wall of the positioning outer ring to guide the pipe connection structure during installation, which can facilitate installation. At the same time, the depth of the installation and fastening position between the pipe connections is limited by the abutment between the limiting inner ring and the limiting outer ring. Therefore, the present invention can avoid the gasket from being squeezed by over-tight installation, and the protection gasket is always in a more ideal installation environment and working environment. The flange joint structure provided by the present invention has a longer service life and is more stable and reliable in sealing the pipeline.

[0022] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 It is a schematic diagram of the flange joint of the present invention in a connected and fixed state;

[0025] Figure 2 is a schematic diagram of the internal structure of the flange joint of the present invention;

[0026] Figure 3 It is a schematic diagram of the connection relationship between two pipe joints in the flange joint of the present invention;

[0027] Figure 4 It is a schematic diagram of the second flange mounting member in the flange joint of the present invention from an axial perspective.

[0028] In the figure, 1 represents the first pipe connection; 11 represents the first sealing groove; 12 represents the positioning outer ring; 13 represents the pipe connection end of the first pipe connection; 14 represents the limiting outer ring; 2 represents the second pipe connection; 21 represents the second sealing groove; 22 represents the positioning inner ring; 23 represents the pipe connection end of the second pipe connection; 24 represents the limiting inner ring; 3 represents the second flange mounting member; 31 represents the second mounting through hole; 4 represents the first flange mounting member; 41 represents the first mounting through hole; 5 represents the gasket; 51 represents the first protrusion; 52 represents the second protrusion DETAILED DESCRIPTION

[0029] In order to make the purpose and technical solution of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art in the field to which the present invention relates. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0031] The meaning of "and / or" in the present invention means that both the cases where each exists alone or both exist at the same time are included.

[0032] The meaning of "inside" and "outside" in the present invention refers to the direction from the outer surface of the flange joint to the medium flowing in the pipeline formed by the flange joint is inside, and the opposite is outside; it is not a specific limitation on the device mechanism of the present invention.

[0033] The term “connection” as used in the present invention may mean a direct connection between components or an indirect connection between components via other components.

[0034] Figure 1 For a flange joint according to the present invention, reference Figure 2As shown in the disassembly diagram, the flange joint can be specifically configured to include:

[0035] A first pipe joint 1, one end of which is provided with a first sealing groove 11;

[0036] A second pipe connection 2, one end of which is provided with a second sealing groove 21;

[0037] The gasket 5 has a first protrusion 51 and a second protrusion 52 at both end surfaces, which are respectively abutted against the first sealing groove 11 and the second sealing groove 21;

[0038] A first flange mounting member 4, which is arranged on the outer periphery of the first pipe connection 1;

[0039] A second flange mounting member 3, which is arranged on the outer periphery of the second pipe connection 2;

[0040] The first flange mounting member 4 and the second flange mounting member 3 fit tightly together and can be fixedly connected by fasteners such as bolts, screws, nuts, studs, pins, rivets, connection pairs, and welding nails.

[0041] Specifically, refer to Figure 2 In the above flange joint, the cross-sectional shape of the first sealing groove 11 and the cross-sectional shape of the second sealing groove 21 can be set to be different to match the two protrusions of the gasket, wherein the cross-sectional shape of the first protrusion 51 of the gasket can be set to be semicircular or arc-shaped, and the cross-sectional shape of the second protrusion 52 of the gasket is different from the cross-sectional shape of the first protrusion 51, and can be specifically set to a rectangular or triangular shape, so as to achieve guidance through the curvature of the protrusion, and achieve a sealed connection inside the sealing groove through the angle structure of the other protrusion. This structure can fill the internal gap of the sealing groove through the thermal expansion of the gasket cross section when the working environment temperature of the flange joint increases, thereby achieving a tight seal at the end of the pipeline.

[0042] Alternatively, in other implementations, the cross-sectional shape of the first sealing groove 11 may be the same as the cross-sectional shape of the second sealing groove 21. In this case, the cross-sectional shape of the corresponding first protrusion 51 is also set to be the same as the cross-sectional shape of the second protrusion 52.

[0043] refer to Figure 3 or Figure 4 In the structure shown in the figure, in order to realize the close contact and fixation between the first pipe connection 1 and the second pipe connection 2, the first flange mounting member 4 can be Figure 4In the manner shown, at least three first mounting holes 41 are evenly arranged along the circumference of the flange, and at least three second mounting holes 31 are arranged on the corresponding second flange mounting member 3, and the first mounting holes 41 and the second mounting holes 31 are respectively arranged correspondingly; the first flange mounting member 4 and the second flange mounting member 3 are fixedly connected through the first mounting holes 41 and the second mounting holes 31, so as to limit the rotation or displacement between the flange mounting members. Among them, in a relatively simple implementation method, the first mounting hole 41 and the second mounting hole 31 can be fixed by bolts through and screwed. In other methods, the first mounting hole 41 and the second mounting hole 31 can also be fixed by other connecting and fixing components, such as pins, protrusions and other structures. Since the torque value of each bolt can be set to be the same by rotating the bolt, this fixing structure can evenly apply a mortgage force to the pipe connection, so that the two pipe connections are fixed to each other, and the rotation between the pipe connections is limited by the bolts.

[0044] The bolts may also be connected to washers or other fastening structures to further ensure that the force acting on the pipe joint is constant and prevent the fasteners from loosening.

[0045] The radial displacement between the above pipe joints can be calculated by Figure 3 The end faces of the positioning outer ring 12 and the positioning inner ring 22 shown are abutted against each other to limit the distance between them. Specifically, in a preferred implementation, the positioning outer ring 12 of the flange joint can be arranged at the end of the first pipe joint 1 and located inside the first sealing groove 11; the positioning inner ring 22 can be arranged at the end of the second pipe joint 2 and located inside the second sealing groove 21; the positioning inner ring 22 is installed inside the positioning outer ring 12, and the end faces of the two abut against each other, limiting the distance between the first sealing groove 11 and the second first sealing groove 21, and protecting the gaskets arranged in the two sealing grooves from being excessively squeezed and deformed and cracked or damaged.

[0046] Furthermore, in order to ensure smooth installation and facilitate the operator to accurately connect the two positioning ring structures in a narrow working environment, the inner wall surface of the positioning outer ring 12 can be provided with Figure 1 The arc of the inward depression shown in the figure, the corresponding outer surface of the end of the positioning inner ring 22 can be provided with Figure 1The arc shown, the two arcs match each other, the end of the positioning inner ring 22 can be guided by the arc of the inner wall surface of the positioning outer ring 12, and accurately docked to be concentric with the positioning outer ring 12. At this time, since the depth of the positioning inner ring 22 inserted into the first pipe joint 1 exceeds the installation position of the gasket relative to the first pipe joint 1, the inner wall of the positioning inner ring 22 can be limited by the accommodation space of the positioning outer ring 12 between the gasket 5 and the medium flow space formed inside the pipe joint. That is to say, in addition to limiting the insertion depth between the pipe joints by abutting with the positioning outer ring to protect the gasket between the two pipe joints from being excessively squeezed, the positioning inner ring 22 in the present invention can further block the medium in the pipeline from directly contacting the gasket to avoid the gasket being affected by the substances or impurities in the medium and aging. The outer circumference of the positioning inner ring 22 is attached to the inner circumference of the positioning outer ring, which can limit the axial displacement between the pipe joints, and the radial movement between the pipe joints is limited by several uniformly arranged fasteners. Therefore, the rubber ring in the present invention can be uniformly abutted and fixed, and the sealing is uniformly limited by the limiting groove. The assembly error between the pipe joints in the present invention can be limited to 20 to 40 threads, which can effectively protect the rubber ring and ensure the sealing effect.

[0047] In addition, the flange joint in the present invention may also include:

[0048] A limiting outer ring 14, which is arranged at the end of the first pipe connection 1 and is located outside the first sealing groove 11;

[0049] The limiting inner ring 24 is arranged at the end of the second pipe connection 2 and is located outside the second sealing groove 21;

[0050] The limiting inner ring 24 is installed inside the limiting outer ring 14, and the two are in contact with each other. The outer circumference of the limiting inner ring 22 fits on the inner circumference of the limiting outer ring 14, so that the limiting gasket can only be fixed in the cavity space formed between the limiting ring and the positioning ring.

[0051] Therefore, due to the mutually abutting positioning structures and limiting structures inside and outside the gasket 5, the gasket will not be directly squeezed and deformed by the excessively squeezed assembled pipe connection structure. On the contrary, by setting the depth of the abutment between the positioning structure and the limiting structure, the squeezing force on the internal gasket 5 can be effectively adjusted to ensure that the gasket is evenly applied with an appropriate squeezing force to ensure the sealing of the pipe connection structure, while ensuring that the gasket is not excessively squeezed and deformed to affect the service life.

[0052] In other implementations, the guide structure of the positioning outer ring 22 and the positioning inner ring 12 can be set as a conical inclined surface in addition to the curvature scheme. The tube head extending into the first pipe connector 1 in a flared shape can provide a guide for the second pipe connector 2. The length of the guide structure can be set to be thicker than the thickness of the rubber pad.

[0053] Therefore, the present invention realizes the fixed connection between the pipe joints and limits the relative rotation between the pipe joint structures through the flange structure. The present invention can set the groove depth of the limiting inner ring and the limiting outer ring so that when the top of the limiting inner ring 24 abuts against the inner bottom surface of the limiting outer ring 14, the compression distance of the gasket 5 is within the non-destructive extrusion range, ensuring that the load on the gasket never exceeds the load-bearing range of elastic deformation, protecting the gasket from damage, deformation or extrusion rupture.

[0054] To facilitate the assembly of the rotating pipe joint or the pipe body connected to its corresponding pipe connection ends 13, 23, the inner circumference of the positioning outer ring 12 can be set to a truncated cone shape, and the outer circumference of the positioning inner ring 22 can be correspondingly matched with the inner circumference and also set to a truncated cone shape.

[0055] In other implementations, the flange mounting member should not be limited to Figure 4 The triangular flange structure shown. Disc, ellipse, rectangle or any polygon can be used to achieve fixed connection between pipe connection structures. Considering the convenience of alignment and assembly, the flange structure is generally preferably set to various regular polygons, regular circles and other symmetrical or axisymmetric structures to facilitate alignment, connection, assembly and fixation between installation through holes.

[0056] The above is only an embodiment of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A flange joint, characterized in that: include: A first pipe joint (1), one end of which is provided with a first sealing groove (11); A second pipe joint (2), one end of which is provided with a second sealing groove (21); The gasket (5) has a first protrusion (51) and a second protrusion (52) respectively disposed on both end surfaces thereof, and respectively abutting against the first sealing groove (11) and the second sealing groove (21); A first flange mounting member (4) fixed to the outer periphery of the first pipe joint (1); A second flange mounting member (3) fixed to the outer periphery of the second pipe joint (2); The first flange mounting member (4) and the second flange mounting member (3) are tightly connected; The flange joint also includes: A positioning outer ring (12) is arranged at the end of the first pipe joint (1) and is located inside the first sealing groove (11); A positioning inner ring (22) is arranged at the end of the second pipe joint (2) and is located inside the second sealing groove (21). The positioning inner ring (22) is installed inside the positioning outer ring (12), and the outer peripheral surface of the positioning inner ring (22) is in contact with the inner peripheral surface of the positioning outer ring; The flange joint also includes: A limiting outer ring (14) is arranged at the end of the first pipe joint (1) and is located outside the first sealing groove (11); The limiting inner ring (24) is arranged at the end of the second pipe joint (2) and is located outside the second sealing groove (21). The limiting inner ring (24) is installed inside the limiting outer ring (14). The outer peripheral surface of the limiting inner ring (24) is attached to the inner peripheral surface of the limiting outer ring (14). Through the mutual abutment relationship between the limiting outer ring and the limiting inner ring, the depth of the positioning inner ring (22) inserted into the positioning outer ring (12) is limited, and the extrusion force on the internal gasket is limited.

2. A flange joint according to claim 1, characterized in that: The cross-sectional shape of the first sealing groove (11) is different from the cross-sectional shape of the second sealing groove (21); the cross-sectional shape of the first protruding portion (51) is different from the cross-sectional shape of the second protruding portion (52).

3. A flange joint according to claim 1, characterized in that: The cross-sectional shape of the first sealing groove (11) is the same as the cross-sectional shape of the second sealing groove (21); the cross-sectional shape of the first protruding portion (51) is the same as the cross-sectional shape of the second protruding portion (52).

4. A flange joint according to claim 1, characterized in that: The first flange mounting member (4) is provided with at least three first mounting through holes (41), and the second flange mounting member (3) is provided with at least three second mounting through holes (31), wherein the first mounting through holes (41) and the second mounting through holes (31) are respectively arranged correspondingly; the first flange mounting member (4) and the second flange mounting member (3) are fixedly connected via the first mounting through holes (41) and the second mounting through holes (31).

5. A flange joint according to any one of claims 1 to 4, characterized in that: When the top end of the limiting inner ring (24) abuts against the inner bottom surface of the limiting outer ring (14), the compression distance of the gasket (5) is within the non-destructive extrusion range.

6. The flange joint according to any one of claims 1 to 4, characterized in that: The inner circumference of the positioning outer ring (12) is in the shape of a truncated cone, and the outer circumference of the positioning inner ring (22) is in the shape of a truncated cone.

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