A corrugated leak-proof flange connecting device of PVDF pipe

Abstract

The utility model relates to flange connecting device technical field discloses a corrugated anti -leakage flange connecting device of PVDF tubular product, solved the problem that the flange connecting device of existing connection stability and the poor tightness, it includes compensation type flange connector, compensation type flange connector is connected between PVDF corrugated pipe one and PVDF corrugated pipe two, PVDF corrugated pipe one and PVDF corrugated pipe two all constitute by corrugated intermediate section and two flat mouth connecting section, two flat mouth connecting section is fixedly connected in the both ends of corrugated intermediate section respectively, compensation type flange connector is composed of compensator, flange connector one and flange connector two, flange connector one is connected between compensator and PVDF corrugated pipe one, and flange connector two is connected between compensator and PVDF corrugated pipe two, through this flange connecting device, can improve the stability and the tightness of connection.

Description

Technical Field

[0001] This utility model belongs to the technical field of flange connection devices, specifically a corrugated anti-leakage flange connection device for PVDF pipes. Background Technology

[0002] PVDF pipes are widely used due to their resistance to acid and alkali corrosion and strong oxidizing agents at room temperature, as well as their high mechanical strength, wear resistance, creep resistance, and impact resistance. PVDF pipes are usually connected via flanges during installation. However, existing flange connection devices have drawbacks such as poor connection stability and sealing with PVDF pipes, and are prone to loosening over time. Therefore, this application proposes a corrugated leak-proof flange connection device for PVDF pipes. Utility Model Content

[0003] In view of the above situation and to overcome the defects of the prior art, this utility model provides a corrugated anti-leakage flange connection device for PVDF pipes, which effectively solves the problems of poor connection stability and sealing performance of existing flange connection devices.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a corrugated anti-leakage flange connection device for PVDF pipes, comprising a compensating flange connector, wherein the compensating flange connector is connected between PVDF corrugated pipe one and PVDF corrugated pipe two, both of which are composed of a corrugated middle section and two flat-end connecting sections, the two flat-end connecting sections being fixedly connected to both ends of the corrugated middle section respectively, and the compensating flange connector comprising a compensator, a flange connector one and a flange connector two, wherein the flange connector one is connected between the compensator and PVDF corrugated pipe one, and the flange connector two is connected between the compensator and PVDF corrugated pipe two;

[0005] Both flange connector one and flange connector two consist of flange one and snap-fit ​​sleeve. Flange one is fixedly connected to one end of snap-fit ​​sleeve. The inner surface of snap-fit ​​sleeve away from flange one has a snap-fit ​​inner groove that matches the flat-mouth connection section. The inner surface of snap-fit ​​inner groove near flange one has an annular overflow groove. Three annular snap-fit ​​grooves are formed in the middle of the inner surface of snap-fit ​​inner groove. Fluororubber O-rings are embedded in the annular snap-fit ​​grooves.

[0006] Preferably, the flange and the snap-fit ​​sleeve are integrally cast structures, the inner diameter of the snap-fit ​​inner groove is the same as the outer diameter of the flat-mouth connecting section, and the inner diameter of the flange is the same as the inner diameter of the flat-mouth connecting section.

[0007] Preferably, the compensator consists of a metal bellows, two flanges, several limiting screws, and several positioning nuts. The two flanges are fixedly connected to both ends of the metal bellows. The limiting screws pass through the two flanges and the positioning nuts are connected to the limiting screws. The flanges are connected to the first flange by several bolts. Both the first and second flanges have several positioning holes that match the limiting screws and several bolt mounting holes.

[0008] Compared with the prior art, the beneficial effects of this utility model are:

[0009] (1) In operation, by setting flange connection head one and flange connection head two consisting of flange one and snap sleeve, and by setting snap inner groove, annular overflow groove, annular snap groove and fluororubber O-ring, the stability and sealing of the connection with PVDF bellows can be improved, the possibility of loosening can be reduced, fluid leakage can be avoided, and service life can be improved.

[0010] (2) By setting up a compensator consisting of a metal bellows, two flanges, several limit screws and several positioning nuts, the compensation function can be realized, the influence of thermal expansion and contraction can be reduced, and the stability of use can be improved. Attached Figure Description

[0011] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0012] In the attached diagram:

[0013] Figure 1 This is a schematic diagram of the corrugated leak-proof flange connection device for PVDF pipe of this utility model.

[0014] Figure 2 This is an exploded view of the corrugated anti-leakage flange connection device for PVDF pipes according to this utility model;

[0015] Figure 3 This is a schematic diagram of the compensator structure of this utility model;

[0016] Figure 4 This is a schematic diagram of the flange connector of this utility model.

[0017] Figure 5 This is a two-section view of the flange connector of this utility model;

[0018] Figure 6 This is a schematic diagram of the connection structure between the flange connector and the flat-mouth connection section of this utility model;

[0019] In the diagram: 1. Compensating flange connector; 2. PVDF bellows one; 3. PVDF bellows two; 4. Bellows middle section; 5. Plain end connection section; 6. Compensator; 7. Flange connector one; 8. Flange connector two; 9. Flange one; 10. Snap-fit ​​sleeve; 11. Snap-fit ​​inner groove; 12. Annular overflow groove; 13. Annular snap-fit ​​groove; 14. Fluororubber O-ring seal; 15. Metal bellows; 16. Flange two; 17. Limiting screw; 18. Locating nut; 19. Locating hole; 20. Bolt mounting hole. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0021] Depend on Figures 1 to 6 The present invention provides a corrugated anti-leakage flange connection device for PVDF pipe, comprising a compensating flange connector 1, which is connected between PVDF corrugated pipe 2 and PVDF corrugated pipe 3. Both PVDF corrugated pipe 2 and PVDF corrugated pipe 3 are composed of a corrugated middle section 4 and two flat-end connecting sections 5. The two flat-end connecting sections 5 are respectively fixedly connected to both ends of the corrugated middle section 4. The compensating flange connector 1 is composed of a compensator 6, a flange connector 7, and a flange connector 8. The flange connector 7 is connected between the compensator 6 and PVDF corrugated pipe 2, and the flange connector 8 is connected between the compensator 6 and PVDF corrugated pipe 3.

[0022] The corrugated middle section 4 enables the PVDF corrugated pipe 1 2 and PVDF corrugated pipe 2 3 to have a certain expansion and contraction compensation function, and the flat end connection section 5 facilitates connection with flange connector 1 7 and flange connector 2 8.

[0023] Both flange connector 7 and flange connector 8 are composed of flange 9 and snap-fit ​​sleeve 10. Flange 9 is fixedly connected to one end of snap-fit ​​sleeve 10. The inner surface of snap-fit ​​sleeve 10 is provided with a snap-fit ​​inner groove 11 that matches the flat-mouth connection section 5 at the end away from flange 9. An annular overflow groove 12 is provided inside the snap-fit ​​inner groove 11 at the end near flange 9. Three annular snap-fit ​​grooves 13 are provided in the middle of the inner surface of snap-fit ​​inner groove 11. Fluororubber O-rings 14 are embedded inside the annular snap-fit ​​grooves 13. Flange 9 and snap-fit ​​sleeve 10 are integrally cast structures. The inner diameter of snap-fit ​​inner groove 11 is the same as the outer diameter of flat-mouth connection section 5, and the inner diameter of flange 9 is the same as the inner diameter of flat-mouth connection section 5.

[0024] During the connection process, the flat-mouth connecting section 5 is inserted into the inside of the snap-fit ​​sleeve 10 and fits against the inner surface of the snap-fit ​​inner groove 11. An annular heating sleeve is installed on the outer surface of the snap-fit ​​sleeve 10 near the annular overflow groove 12 to achieve local heating of the snap-fit ​​sleeve 10. At this time, the flat-mouth connecting section 5 near the annular overflow groove 12 softens due to heat. Then, the flange 9 is pushed forcefully to fill the interior of the annular overflow groove 12 with the melted and softened flat-mouth connecting section 5. After the melted part cools down, the inner surface of the flat-mouth connecting section 5 is scraped flat with a knife. The fluororubber O-ring 14 can improve the sealing performance of the connection. The fluororubber O-ring 14 also has high temperature resistance to avoid being affected by high temperature.

[0025] The compensator 6 consists of a metal bellows 15, two flanges 16, several limiting screws 17, and several positioning nuts 18. The two flanges 16 are fixedly connected to both ends of the metal bellows 15. The limiting screws 17 pass through the two flanges 16. The positioning nuts 18 are connected to the limiting screws 17. The flanges 16 and 9 are connected by several bolts. Both the flanges 9 and 16 have several positioning holes 19 that match the limiting screws 17 and several bolt mounting holes 20.

[0026] The metal bellows 15 can achieve expansion and contraction compensation, the limiting screw 17 and the positioning nut 18 can form a limiting function, and the second flange 16 can be connected to the first flange 9 by bolts to further improve the stability of the connection. When connecting, a sealing gasket needs to be set between the second flange 16 and the first flange 9 to further improve the sealing performance of the connection.

[0027] In operation, by setting up flange connector 1 and flange connector 2, which consist of flange 1 and snap-fit ​​sleeve, and by setting up snap-fit ​​inner groove, annular overflow groove, annular snap-fit ​​groove and fluororubber O-ring, the stability and sealing of the connection with PVDF bellows can be improved, the possibility of loosening can be reduced, fluid leakage can be avoided, and service life can be extended. By setting up a compensator consisting of metal bellows, two flanges 2, several limit screws and several positioning nuts, the compensation function can be realized, the impact of thermal expansion and contraction can be reduced, and the stability of use can be improved.

Claims

1. A PVDF pipe leak-proof flange connection device with corrugation, comprising a compensating flange connector (1), characterized in that: The compensating flange connector (1) is connected between PVDF corrugated pipe one (2) and PVDF corrugated pipe two (3). Both PVDF corrugated pipe one (2) and PVDF corrugated pipe two (3) are composed of a corrugated middle section (4) and two flat-mouth connecting sections (5). The two flat-mouth connecting sections (5) are fixedly connected to both ends of the corrugated middle section (4). The compensating flange connector (1) is composed of a compensator (6), a flange connector one (7) and a flange connector two (8). The flange connector one (7) is connected between the compensator (6) and PVDF corrugated pipe one (2), and the flange connector two (8) is connected between the compensator (6) and PVDF corrugated pipe two (3). Both flange connector one (7) and flange connector two (8) are composed of flange one (9) and snap-fit ​​sleeve (10). Flange one (9) is fixedly connected to one end of snap-fit ​​sleeve (10). The inner surface of snap-fit ​​sleeve (10) away from flange one (9) has a snap-fit ​​inner groove (11) that matches the flat-mouth connection section (5). The inner end of snap-fit ​​inner groove (11) near flange one (9) has an annular overflow groove (12). The middle position of the inner surface of snap-fit ​​inner groove (11) has three annular snap-fit ​​grooves (13). Fluororubber O-rings (14) are embedded in the annular snap-fit ​​grooves (13).

2. A PVDF pipe leak-proof flange connecting device with corrugation according to claim 1, characterized in that: The flange (9) and the snap-fit ​​sleeve (10) are integrally cast structures. The inner diameter of the snap-fit ​​inner groove (11) is the same as the outer diameter of the flat-mouth connecting section (5), and the inner diameter of the flange (9) is the same as the inner diameter of the flat-mouth connecting section (5).

3. A PVDF pipe leak-proof flange connecting device with corrugation according to claim 1, characterized in that: The compensator (6) consists of a metal bellows (15), two flanges (16), several limiting screws (17) and several positioning nuts (18). The two flanges (16) are fixedly connected to both ends of the metal bellows (15). The limiting screws (17) pass through the two flanges (16). The positioning nuts (18) are connected to the limiting screws (17). The flanges (16) and flanges (9) are connected by several bolts.

4. A PVDF pipe leak-proof flange connecting device with corrugation according to claim 3, characterized in that: Both flange one (9) and flange two (16) are provided with a number of positioning holes (19) that match the limiting screw (17) and a number of bolt mounting holes (20).

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