A type of liquid pipeline flange joint

Abstract

This utility model discloses a liquid pipeline flange joint, including a first flange, a second flange, a sealing assembly, connecting bolts, and a bolt fastening assembly. The first flange has a first annular groove, and the second flange has a second annular groove. The sealing assembly includes a first sealing ring and a positioning ring fixed to the back of the first sealing ring. The positioning ring is inserted into the first annular groove, and its outer wall has multiple equidistant grooves. The outer side wall of the first annular groove has multiple teeth that mate with the grooves. The outer wall of the first sealing ring away from the positioning ring is an inclined surface with recessed steps. The second annular groove matches and completely overlaps with the first sealing ring. The positioning ring is confined within the grooves of the first annular groove by the teeth, preventing the first sealing ring from rotating within the groove and thus preventing displacement.

Description

Technical Field

[0001] This utility model relates to the field of flange joint technology, specifically a flange joint for liquid pipelines. Background Technology

[0002] A flange is a disc-shaped part, usually with bolt holes, which is used to achieve a sealing connection between two planes by bolting. Its core components include the flange plate, gasket, and bolts and nuts.

[0003] However, the current flanges mainly have the following problems: (1) Only one set of sealing gaskets is provided. The single sealing ring is prone to displacement and failure under high pressure impact, resulting in a decrease in sealing performance; (2) Bolts are prone to loosening due to thermal expansion and contraction or vibration, resulting in unstable flange connection. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a liquid pipeline flange joint to solve the problem of easy displacement and failure of single sealing rings.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A liquid pipeline flange joint includes a first flange, a second flange, a sealing assembly, connecting bolts, and a bolt fastening assembly. Bolt holes are provided on the periphery of both the first and second flanges. A coaxial first annular groove is provided on the side of the first flange facing the second flange, and a coaxial second annular groove is provided on the side of the second flange facing the first flange. The second annular groove communicates with the bolt holes. The sealing assembly includes a first sealing ring and a positioning ring fixed to the back of the first sealing ring. The positioning ring is inserted into the first annular groove, and its outer wall has multiple equidistant grooves. The outer side wall of the first annular groove has multiple teeth that mate with the grooves. The outer wall of the first sealing ring away from the positioning ring is inclined, and a recessed step is provided on the inclined surface. The second annular groove matches and completely overlaps with the first sealing ring. Movable cavities communicating with the bolt holes are provided on the periphery of both the first and second flanges. Each movable cavity corresponds to a bolt hole. The bolt fastening assembly is threaded into the movable cavity, and tightening the bolt fastening assembly causes its inner end to press tightly against the connecting bolt.

[0007] Preferably, the mating surfaces of the first flange and the second flange are both provided with coaxial third annular grooves. The two third annular grooves have the same diameter and are located outside the first and second annular grooves, respectively. The cross-section of the third annular groove is T-shaped, and the bottom width is greater than the opening width. The sealing assembly also includes a second sealing ring with a T-shaped cross-section, which is fitted into the third annular groove.

[0008] The above technical solution, by adding a second sealing ring, can further improve the sealing performance of the first flange and the second flange. Furthermore, the second sealing ring has a T-shaped cross-section; its wide portion is embedded in the bottom of the third annular groove, and its narrow portion is embedded in the groove opening, preventing the second sealing ring from falling off.

[0009] Preferably, the movable cavity includes a first groove, a screw hole, and a second groove connected in sequence. The first groove is disposed on the outer wall of the corresponding flange, and the second groove communicates with the bolt hole of the corresponding flange. The bolt fastening assembly includes a screw, a rotary bearing, and a pressure block. The screw is threaded into the screw hole, one end of the screw is connected to the pressure block through the rotary bearing, and the end of the pressure block away from the screw has an arc-shaped groove that matches the connecting bolt. The other end of the screw is connected to a nut, which is located in the first groove, and the pressure block is located in the second groove. The length of the screw is greater than the length of the screw hole.

[0010] In the above technical solution, after the connecting bolts fix the first flange and the second flange, the screw is tightened by screwing the nut on the screw rod, causing the screw rod to move in the direction of the bolt hole, thereby pushing the pressure block and pressing it tightly onto the connecting bolt, further fixing the connecting bolt and preventing it from loosening.

[0011] Preferably, both the first sealing ring and the second sealing ring are made of fluororubber.

[0012] In the above technical solution, fluororubber has elasticity and good sealing performance.

[0013] The beneficial effects of this utility model are:

[0014] The sealing assembly includes a first sealing ring and a positioning ring. The positioning ring is restrained within a groove in the first annular groove by a retaining tooth, preventing the first sealing ring from rotating within the first annular groove and thus preventing displacement. Additionally, the first sealing ring is embedded within a second annular groove of the second flange, and both the first sealing ring and the second annular groove have interlocking steps, further enhancing the sealing performance after the two flanges are connected.

[0015] After the connecting bolts fix the first and second flanges, the bolt fastening assembly is pressed tightly onto the connecting bolts to further secure them and effectively prevent them from loosening. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the present invention;

[0017] Figure 2 This is a cross-sectional view of the present invention;

[0018] Figure 3 This is a rear view of the first sealing ring;

[0019] Figure 4 for Figure 2 Enlarged view of point A;

[0020] Figure 5 for Figure 2 Enlarged view of point B;

[0021] Figure 6 for Figure 2 Enlarged view of point C;

[0022] Figure 7 This is a schematic diagram of a bolt fastening assembly;

[0023] In the figure: 1-First flange, 2-Second flange, 3-Sealing assembly, 31-First sealing ring, 32-Positioning ring, 33-Slot, 34-Slot tooth, 35-Step, 36-Second sealing ring, 4-Bolt fastening assembly, 41-Screw, 42-Rotating bearing, 43-Pressure block, 44-Nut, 5-Bolt hole, 6-First annular groove, 7-Second annular groove, 8-Moving cavity, 81-First groove, 82-Screw hole, 83-Second groove, 9-Third annular groove. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1

[0026] Please see Figure 1-7 A liquid pipeline flange joint includes a first flange 1, a second flange 2, a sealing assembly 3, and connecting bolts. Both flanges are made of 304 stainless steel with an edge thickness of 25mm and a central protruding portion thickness of 40mm. Each flange has bolt holes 5 with a diameter of 21mm, and M20 bolts are used for the connection. The diameter of the two flanges ranges from 100mm to 300mm. When the diameter is 100mm, it is a DN100 flange with 8 bolt holes; when the diameter is 300mm, it is a DN300 flange with 16 bolt holes.

[0027] The first flange 1 has a coaxial first annular groove 6 with a groove depth of 3mm on the side facing the second flange 1, and the second flange 2 has a coaxial second annular groove 7 with a groove depth of 3mm on the side facing the first flange 1. The second annular groove 7 is connected to the bolt hole 5.

[0028] The sealing assembly 3 includes a first sealing ring 31 and a positioning ring 32 fixed to the back of the first sealing ring. The positioning ring 32 is made of elastic fluororubber, and its thickness is the same as the depth of the first annular groove 6, both being 3mm. The first sealing ring 31 is also made of elastic fluororubber, and its thickness is the same as the depth of the second annular groove, both being 3mm. The positioning ring 32 is inserted into the first annular groove 6. The outer wall of the positioning ring 32 has multiple equidistant and circumferentially distributed slots 33. The outer sidewall of the first annular groove 6 has multiple locking teeth 34 that mate with the slots. The locking teeth 34 are fixed to the sidewall of the first annular groove 6. The positioning ring 32 is confined within the slots 33 of the first annular groove 6 by the locking teeth 34, which prevents the first sealing ring 31 from rotating within the first annular groove 6, thereby preventing the first sealing ring 31 from shifting.

[0029] The outer wall of the first sealing ring 31 on the side away from the positioning ring is inclined, and a recessed step 35 is provided on the inclined surface. The second annular groove 7 matches the first sealing ring 31. When the first flange 1 and the second flange 2 are mated, the first sealing ring 31 and the second annular groove 7 completely overlap. By setting the step, the sealing performance after the two flanges are connected is further improved.

[0030] Both the mating surfaces of the first flange 1 and the second flange 2 are provided with coaxial third annular grooves 9. The two third annular grooves 8 have the same diameter and are located on the periphery of the first and second annular grooves, respectively. The cross-section of the third annular groove 9 is T-shaped, with a groove depth of 8 mm. The bottom width of the groove is greater than the opening width, and the bottom width is 1.5 times the opening width. The sealing assembly 3 also includes a second sealing ring 36 with a T-shaped cross-section. The second sealing ring 36 is made of elastic fluororubber and is fitted into the third annular groove 9. Specifically, the wide part of the second sealing ring is embedded in the bottom of the third annular groove, and the narrow part of the second sealing ring is embedded in the opening to prevent the second sealing ring from falling out.

[0031] The connection method in this embodiment is as follows:

[0032] First, align the tooth 34 with the groove 33. Then, insert the positioning ring 32 into the first annular groove 6 so that the first sealing ring 31 is located outside the first flange 1. Next, insert the two second sealing rings 36 into the two second annular grooves 7 respectively. Then, assemble the first flange 1 and the second flange 2 so that the first sealing ring 31 is inserted into the second annular groove 7 and the two second sealing rings 36 are assembled. Finally, insert the connecting bolt into the bolt hole 5 and tighten the nut to connect the two flanges.

[0033] Example 2

[0034] Based on Embodiment 1, the outer periphery of the first flange 1 and the second flange 2 is provided with a movable cavity 8 that communicates with the bolt hole 5. The movable cavity 8 corresponds one-to-one with the bolt hole 5. The bolt fastening assembly 4 is threadedly connected to the movable cavity 8. Tightening the bolt fastening assembly 4 makes its inner end press tightly against the connecting bolt.

[0035] The movable cavity includes a first groove 81, a screw hole 82, and a second groove 83 connected in sequence. The first groove 81 is located on the outer wall of the corresponding flange, and the second groove 83 is connected to the bolt hole 5 of the corresponding flange. The bolt fastening assembly 4 includes a screw 41, a rotary bearing 42, and a pressure block 43. The screw 41 is threaded into the screw hole 82. One end of the screw 41 is connected to the pressure block 43 through the rotary bearing 42. The end of the pressure block 43 away from the screw has an arc-shaped groove that matches the connecting bolt. The other end of the screw 41 is connected to a nut 44, which is located in the first groove 81. The pressure block 43 is located in the second groove 83. The length of the screw 41 is greater than the length of the screw hole 82.

[0036] After the connecting bolts fix the first flange 1 and the second flange 2, the nut 44 on the screw is tightened by screwing the screw 41 in the screw hole 82 towards the bolt hole 5, thereby pushing the pressure block 43 and pressing the pressure block 43 tightly onto the connecting bolt, further fixing the connecting bolt and preventing it from loosening.

[0037] Although the process of tightening the screw is somewhat cumbersome, it effectively presses the connecting bolt into the bolt hole, preventing it from loosening and thus providing greater stability. To improve the sealing of the moving cavity, a sealing ring is also installed around the screw to prevent water from seeping into the bolt hole.

[0038] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A liquid pipeline flange joint, comprising a first flange (1), a second flange (2), a sealing assembly (3), connecting bolts and a bolt fastening assembly (4), wherein bolt holes (5) are provided on the periphery of both the first flange (1) and the second flange (2), characterized in that: The first flange (1) has a coaxial first annular groove (6) on the side facing the second flange, and the second flange (2) has a coaxial second annular groove (7) on the side facing the first flange (1). The second annular groove (7) is connected to the bolt hole (5). The sealing assembly (3) includes a first sealing ring (31) and a positioning ring (32) fixed to the back of the first sealing ring. The positioning ring (32) is inserted into the first annular groove (6). The outer wall of the positioning ring (32) is provided with a plurality of equidistant slots (33). The outer side wall of the first annular groove (6) is provided with a plurality of teeth (34) that cooperate with the slots. The outer wall of the first sealing ring (31) away from the positioning ring is an inclined surface, and a recessed step (35) is provided on the inclined surface. The second annular groove (7) matches the first sealing ring (31) and can overlap with the first sealing ring (31). The first flange (1) and the second flange (2) are both provided with movable cavities (8) that communicate with bolt holes (5) on their periphery. The movable cavities (8) correspond one-to-one with the bolt holes (5). The bolt fastening assembly (4) is threadedly connected to the movable cavity (8). Tightening the bolt fastening assembly (4) makes its inner end press tightly against the connecting bolt.

2. A liquid pipe flange joint according to claim 1, characterized in that: The mating surfaces of the first flange (1) and the second flange (2) are provided with coaxial third annular grooves (9). The diameters of the two third annular grooves (9) are the same. The two third annular grooves (9) are located on the periphery of the first annular groove and the second annular groove, respectively. The cross-section of the third annular groove (9) is T-shaped, and the bottom width of the groove is greater than the opening width.

3. A liquid pipe flange joint according to claim 2, characterized in that: The sealing assembly (3) also includes a second sealing ring (36) with a T-shaped cross section, which is fitted into a third annular groove (9).

4. A liquid pipe flange joint according to claim 3, characterized in that: The movable cavity (8) includes a first groove (81), a screw hole (82), and a second groove (83) connected in sequence. The first groove (81) is located on the outer wall of the corresponding flange, and the second groove (83) is connected to the bolt hole (5) of the corresponding flange.

5. A liquid pipe flange joint according to claim 4, characterized in that: The bolt fastening assembly (4) includes a screw (41), a rotary bearing (42), and a pressure block (43). The screw (41) is threaded into the screw hole (82). One end of the screw (41) is connected to the pressure block (43) through the rotary bearing (42). The end of the pressure block (43) away from the screw is provided with an arc-shaped groove that matches the connecting bolt. The other end of the screw (41) is connected to a nut (44). The nut (44) is located in the first groove (81), and the pressure block (43) is located in the second groove (83). The length of the screw (41) is greater than the length of the screw hole (82).

6. A liquid pipe flange joint according to claim 5, characterized in that: The first sealing ring (31) and the second sealing ring (36) are both made of fluororubber.

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