Anti-loose gas flange connecting device

Abstract

The utility model relates to flange connecting device technical field especially discloses a kind of anti-loosening gas flange connecting devices, including first flange, second flange and connecting assembly, protective cover and connecting cover are set from the both sides of second flange, limit cylinder end and nut end face are completely adhered, bolt is inserted into the insertion hole of protective cover outside and the insertion hole on connecting cover, limit plate is aligned with limit hole and fixed frame, after limit plate is in place, the extension end of limit spring sheet should be close to the outer surface of fixed frame, bolt cannot move along axial direction under the restriction of limit plate, while fixed frame is radially constrained to limit plate, protective cover and connecting cover form closed protective space, avoid that nut is eroded by rain, corrosive gas, dust and other external factors, guarantee the reliability of flange connection, double limit structure can strengthen the anti-loosening effect of flange connection, fundamentally reduce the gas leakage risk caused by nut loosening or corrosion, guarantee long-term stable operation of gas delivery system.

Description

Technical Field

[0001] This utility model relates to the technical field of flange connection devices, and in particular to a gas flange connection device for preventing loosening. Background Technology

[0002] In gas transmission systems, flange connections are the core method for achieving detachable connections between pipes and between pipes and equipment. Their stability and sealing directly determine the safety and reliability of gas transmission. Due to the flammable and explosive nature of natural gas, loosening or sealing failure of flange connections can easily lead to gas leaks. This not only wastes energy but can also cause major safety accidents such as explosions and fires, posing a serious threat to the surrounding environment, lives, and property. Therefore, the anti-loosening and protective design of flange connections has always been a core focus in the research, development, and maintenance of gas transmission system equipment.

[0003] Currently, traditional flange connection devices used in gas transmission systems mainly rely on the cooperation of bolts and nuts to achieve the fastening between flanges. To improve the anti-loosening effect, some devices will use auxiliary structures such as spring washers, brake washers, or double nut locking. However, in actual application, nuts, bolts, and auxiliary washers are exposed to the external environment for a long time and are subject to continuous erosion by rainwater and snow, which causes damage to the anti-rust coating on the metal surface and triggers electrochemical corrosion. Even in indoor environments, dust, oil, and other impurities will accumulate in the thread gaps and sealing surfaces, which not only affects the flexibility of nut disassembly but also further aggravates local corrosion. After the nut rusts, its preload will decrease significantly, and it will be unable to effectively compress the sealing gasket, thereby destroying the sealing and reliability of the flange connection, resulting in a significant increase in the risk of gas leakage and seriously threatening the safe operation of the gas transmission system. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an anti-loosening gas flange connection device. This solves the problem that in practical applications, nuts, bolts, and auxiliary washers are constantly exposed to the external environment and subjected to continuous erosion from rain and snow, leading to damage to the anti-rust coating on the metal surface and causing electrochemical corrosion. Even indoors, dust, oil, and other impurities accumulate in the thread gaps and sealing surfaces, affecting the flexibility of nut disassembly and further exacerbating localized corrosion. Rusting of the nut results in a significant decrease in its preload, making it unable to effectively compress the sealing gasket, thus compromising the sealing and reliability of the flange connection. This significantly increases the risk of gas leakage and seriously threatens the safe operation of the gas transmission system.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A gas flange connection device for preventing loosening includes a first flange, a second flange, and connecting components. The connecting components include bolts and nuts. The second flange is provided with a protective component to prevent the nuts from loosening. Each protective component includes a protective cover, a connecting cover, and a limiting sleeve. Both ends of the protective cover are provided with connecting components for connecting with the connecting cover. Each connecting component includes a socket and a pin. Both ends of the second flange are provided with limiting components for limiting the movement of the pin. Each limiting component includes a fixing bracket, a limiting hole, a limiting plate, and a limiting spring.

[0007] Preferred configuration: The protective cover and the connecting cover fit together, the nut is located inside the protective cover and the connecting cover, there are two sets of limiting cylinders, each set has three, and the two limiting cylinders are respectively fixedly installed inside the protective cover and the connecting cover.

[0008] Preferably, there are two sockets, which are respectively opened on the outside of the protective cover and the connecting cover, and the pin is slidably connected inside the two sockets.

[0009] Preferably, the fixing bracket is located outside the second flange, the limiting hole is located outside the pin, the limiting plate is slidably connected inside the fixing bracket and the limiting hole, the limiting spring is located outside the limiting plate and is used to limit the movement of the limiting plate, the limiting plate limits the axial displacement of the pin by cooperating with the limiting hole, and at the same time cannot be radially offset under the constraint of the fixing bracket.

[0010] Preferably, each limiting plate has a deformation groove on its exterior. One end of the limiting spring is fixedly connected to the inside of the deformation groove, and the other end extends outward. The deformation groove provides space for the deformation of the limiting spring.

[0011] Preferably, each fixed frame is provided with a limiting block on its exterior to restrict the movement of the limiting spring. Each fixed frame has an installation groove on its exterior, and the limiting block is snapped into the interior of the installation groove. A protrusion is fixedly installed on the exterior of the limiting block. The limiting block forms a secondary constraint on the limiting spring, preventing the limiting spring from deforming due to accidental compression or long-term use, which could cause the limiting plate to loosen, and further improving the reliability of the limiting component.

[0012] Preferably, the first flange and the second flange are fitted together, and bolts are passed through the bolt holes on the first flange and the second flange in sequence. Nuts are threaded onto the ends of the bolts to achieve initial fixation of the first flange and the second flange.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The protective cover and connecting cover are fitted onto both sides of the second flange. Align the limiting sleeves inside the protective cover and connecting cover with the threaded portion of the protruding nut, and slowly fit them on until the end of the limiting sleeve is completely flush with the end face of the nut. Hold the pin and insert it into the insertion hole on the outside of the protective cover, pushing the pin through the insertion hole of the connecting cover until both ends of the pin protrude beyond the insertion hole. Take the limiting plate and align it with the limiting hole on the pin and the fixing bracket on the second flange. During insertion, the limiting spring on the outside of the limiting plate will successively contact and be compressed against the inner wall of the limiting hole and the inside of the fixing bracket. When the limiting plate is in place, the limiting spring will disengage from the internal constraint of the fixing bracket, automatically reset, and spring back. Its extended end should be tightly attached to the outer surface of the fixing frame. At this time, the pin cannot move axially under the restriction of the limiting plate. At the same time, the fixing frame radially constrains the limiting plate. Through the dual limiting structure of axial and radial, it can effectively prevent the protective cover and connecting cover assembly from moving axially or radially along the pipeline. The protective cover and connecting cover form a closed protective space, which can prevent the nut from being corroded by external factors such as rainwater, corrosive gases, and dust, and ensure the reliability of the flange connection. On the other hand, the dual limiting structure can strengthen the anti-loosening effect of the flange connection, fundamentally reduce the risk of gas leakage caused by loose or corroded nuts, and ensure the long-term stable operation of the gas transmission system. Attached Figure Description

[0015] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This utility model Figure 1 Structural diagram of the connecting cover;

[0018] Figure 3 This utility model Figure 2 A bottom view of the structure of the central connecting cover;

[0019] Figure 4 This utility model Figure 2 Structural diagram of the center pin;

[0020] Figure 5 This utility model Figure 2 A bottom view of the central fixed frame;

[0021] Figure 6 This utility model Figure 1 Enlarged structural diagram at point A in the middle.

[0022] Legend: 1. First flange; 2. Second flange; 3. Nut; 4. Bolt; 5. Protective cover; 6. Connecting cover; 7. Limiting sleeve; 8. Insertion hole; 9. Pin; 10. Fixing bracket; 11. Limiting hole; 12. Limiting plate; 13. Limiting spring; 14. Deformation groove; 15. Limiting block; 16. Mounting groove; 17. Protrusion. Detailed Implementation

[0023] This application provides an anti-loosening gas flange connection device, which effectively solves the technical problem that in practical applications, nuts, bolts, and auxiliary washers are exposed to the external environment for a long time and are continuously washed by rain and snow, causing damage to the anti-rust coating on the metal surface and triggering electrochemical corrosion. Even in indoor environments, dust, oil, and other impurities accumulate in the thread gaps and sealing surfaces, which not only affects the flexibility of nut disassembly but also further aggravates local corrosion. After the nut rusts, its preload will decrease significantly, making it unable to effectively compress the sealing gasket, thereby damaging the sealing and reliability of the flange connection, resulting in a significant increase in the risk of gas leakage and seriously threatening the safe operation of the gas transmission system.

[0024] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the technical solution in this application embodiment effectively solves the problem that in practical applications, nuts, bolts, and auxiliary washers are exposed to the external environment for a long time and are subject to continuous erosion by rainwater and snowmelt, which leads to damage to the anti-rust coating on the metal surface and causes electrochemical corrosion. Even in indoor environments, dust, oil, and other impurities accumulate in the thread gaps and sealing surfaces, which not only affects the flexibility of nut disassembly but also further aggravates local corrosion. After the nut rusts, its preload will decrease significantly, making it unable to effectively compress the sealing gasket, thereby damaging the sealing and reliability of the flange connection, resulting in a significant increase in the risk of gas leakage and seriously threatening the safe operation of the gas transmission system. The overall idea is as follows:

[0025] To address the problems existing in the prior art, this utility model provides an anti-loosening gas flange connection device, including a first flange 1, a second flange 2, and a connecting assembly. The first flange 1 and the second flange 2 are fitted together. The connecting assembly includes bolts 4 and nuts 3. The bolts 4 pass through the bolt holes on the first flange 1 and the second flange 2 in sequence. The nuts 3 are threaded onto the ends of the bolts 4 to achieve initial fixation of the first flange 1 and the second flange 2.

[0026] The second flange 2 is provided with a protective assembly to prevent the nut 3 from loosening. The protective assembly includes a protective cover 5, a connecting cover 6, and a limiting cylinder 7. The protective cover 5 and the connecting cover 6 fit together. The nut 3 is located inside the protective cover 5 and the connecting cover 6. There are two sets of limiting cylinders 7, with three in each set. The two limiting cylinders 7 are fixedly installed inside the protective cover 5 and the connecting cover 6 respectively.

[0027] The protective cover 5 and the connecting cover 6 are fitted from both sides of the second flange 2, forming a closed protective space that completely encloses the nut 3, preventing external dust, moisture, and corrosive substances from directly contacting the nut 3. The precise fit between the limiting sleeve 7 and the nut 3 provides direct axial constraint on the nut 3. Combined with the enclosure provided by the protective cover 5 and the connecting cover 6, this double protection prevents the nut 3 from loosening due to vibration and pressure changes during long-term use, thus improving the reliability of the device against loosening.

[0028] Both ends of the protective cover 5 are provided with connecting components for connecting to the connecting cover 6. Each connecting component includes a socket 8 and a pin 9. There are two sockets 8, which are respectively opened on the outside of the protective cover 5 and the connecting cover 6. The pin 9 is slidably connected inside the two sockets 8.

[0029] The fitting structure of the pin 9 and the socket 8 is simple and easy to install. Simply insert the pin 9 through the socket 8 to complete the splicing of the protective cover 5 and the connecting cover 6, thus improving construction efficiency.

[0030] The second flange 2 is provided with limiting components at both ends to restrict the movement of the pin 9. Each limiting component includes a fixing frame 10, a limiting hole 11, a limiting plate 12, and a limiting spring 13. The fixing frame 10 is located outside the second flange 2, the limiting hole 11 is opened outside the pin 9, the limiting plate 12 is slidably connected to the fixing frame 10 and the limiting hole 11 inside, and the limiting spring 13 is located outside the limiting plate 12 and is used to restrict the movement of the limiting plate 12.

[0031] The cooperation between the limiting plate 12, the limiting hole 11, and the fixing bracket 10 forms a double constraint on the pin 9, ensuring that the pin 9 cannot move, thereby ensuring the splicing stability of the protective cover 5 and the connecting cover 6 and preventing the protective components from loosening. The automatic reset function of the limiting spring 13 can lock the limiting plate 12 without additional tools, simplifying the installation operation and improving construction efficiency. After the limiting spring 13 is reset, it is tightly attached to the fixing bracket 10, which can effectively prevent the limiting plate 12 from falling off due to vibration, further strengthening the limiting effect of the pin 9 and ensuring the stability of the protective components.

[0032] Each limiting plate 12 has a deformation groove 14 on its outside. One end of the limiting spring piece 13 is fixedly connected to the inside of the deformation groove 14, and the other end extends outward.

[0033] Each fixed frame 10 is provided with a limiting block 15 on its exterior to restrict the movement of the limiting spring 13. Each fixed frame 10 has an installation groove 16 on its exterior, and the limiting block 15 is snapped into the interior of the installation groove 16. A protrusion 17 is fixedly installed on the exterior of the limiting block 15.

[0034] The limiting block 15 provides secondary constraint on the limiting spring 13, preventing the limiting spring 13 from deforming due to accidental compression or long-term use, which could cause the limiting plate 12 to loosen. This further enhances the reliability of the limiting assembly, forming a quadruple guarantee of pin 9 limiting, limiting plate 12 limiting, limiting spring 13 limiting, and limiting block 15 limiting. The design of the protrusion 17 makes the operation of the limiting block 15 more convenient, allowing the sliding and locking of the limiting block 15 to be completed without the aid of tools, thus improving operational flexibility. The limiting block 15 is snapped into the mounting groove 16, making installation and disassembly convenient without affecting the overall removability of the limiting assembly, and facilitating the removal of the limiting plate 12 during subsequent maintenance.

[0035] Example 1

[0036] First, lay the rubber gasket flat on the sealing surface of the first flange 1, ensuring that the through hole of the rubber gasket is fully aligned with the bolt 4 hole of the flange. Then, attach the first flange 1 to the second flange 2. Pass the bolt 4 through the bolt 4 hole of the first flange 1, the through hole of the rubber gasket, and the bolt 4 hole of the second flange 2 in sequence, with the head of the bolt 4 close to the outside of the first flange 1. Tighten the nut 3 with a torque wrench to ensure that the flange and the rubber gasket are tightly fitted without any sealing gap. Hold the protective cover 5 and the connecting cover 6 with both hands respectively, and put them on from both sides of the second flange 2. First, align the three limiting cylinders 7 on the inside of the protective cover 5 with the threaded parts of the three sets of protruding nuts 3, and slowly put them on until the end of the limiting cylinder 7 is fully fitted with the end face of the nut 3. Then, align the three limiting cylinders 7 on the inside of the connecting cover 6 with the remaining three sets of threaded parts and nuts 3, and move the connecting cover 6 until it is tightly fitted with the outside of the protective cover 5. At this time, the insertion hole 8 of the protective cover 5 and the connecting cover 6 are fully aligned.

[0037] Holding the pin 9, insert it into the insertion hole 8 on the outside of the protective cover 5, and push the pin 9 through the insertion hole 8 of the connecting cover 6 until both ends of the pin 9 protrude from the outside of the insertion hole 8. Take the limiting plate 12 and align it with the limiting hole 11 on the pin 9 and the fixing bracket 10 on the second flange 2. During the insertion process, the limiting spring piece 13 on the outside of the limiting plate 12 will contact and be compressed with the inner wall of the limiting hole 11 and the inside of the fixing bracket 10. When the limiting plate 12 is in place, the limiting spring piece 13 will be released from the internal constraint of the fixing bracket 10, automatically reset and spring open. Its extended end should be close to the outer surface of the fixing bracket 10. At this time, the pin 9 cannot move axially under the restriction of the limiting plate 12. At the same time, the fixing bracket 10 provides radial constraint on the limiting plate 12, which doubles the protection of the protective cover 5 and the connecting cover 6. The components will not move axially or radially along the pipeline, thus achieving effective protection and anti-loosening of the nut 3.

[0038] Example 2

[0039] Before installing the limiting plate 12, insert the limiting block 15 into the mounting groove 16 and ensure that the limiting block 15 is fully inserted into the mounting groove 16. Then, install the limiting plate 12. After the limiting spring 13 resets, pull the protrusion 17 to make the limiting block 15 slide and contact the limiting spring 13, thereby restricting the reset of the limiting spring 13. After completing the above operations, the pin 9 cannot move axially under the restriction of the limiting plate 12. The fixing bracket 10 provides radial constraint to the limiting plate 12. At the same time, the limiting effect of the limiting block 15 on the limiting spring 13 further prevents the limiting plate 12 from loosening due to the deformation of the limiting spring 13. This triple protection ensures that the component body composed of the protective cover 5 and the connecting cover 6 will not move axially or radially along the pipeline, can stably cover the nut 3, and effectively prevent the nut 3 from loosening due to vibration, pressure changes, and other factors during long-term use, thus effectively ensuring the sealing and safety of the gas flange connection.

[0040] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A gas flange connection device for preventing loosening, comprising a first flange (1), a second flange (2), and a connecting assembly, the connecting assembly comprising bolts (4) and nuts (3), characterized in that, The second flange (2) is provided with a protective assembly to prevent the nut (3) from loosening. The protective assembly includes a protective cover (5), a connecting cover (6), and a limiting cylinder (7). Both ends of the protective cover (5) are provided with connecting components for connecting to the connecting cover (6), and each connecting component includes a socket (8) and a pin (9). The second flange (2) is provided with limiting components at both ends for limiting the movement of the pin (9). Each limiting component includes a fixing frame (10), a limiting hole (11), a limiting plate (12), and a limiting spring (13).

2. The anti-loosening gas flange connection device as described in claim 1, characterized in that, The protective cover (5) and the connecting cover (6) fit together. The nut (3) is located inside the protective cover (5) and the connecting cover (6). There are two sets of limiting cylinders (7), each set has three cylinders. The two limiting cylinders (7) are respectively fixedly installed inside the protective cover (5) and the connecting cover (6).

3. The anti-loosening gas flange connection device as described in claim 1, characterized in that, There are two sockets (8), which are respectively opened on the outside of the protective cover (5) and the connecting cover (6), and the pin (9) is slidably connected inside the two sockets (8).

4. The anti-loosening gas flange connection device as described in claim 1, characterized in that, The fixing frame (10) is located outside the second flange (2), the limiting hole (11) is located outside the pin (9), the limiting plate (12) is slidably connected inside the fixing frame (10) and the limiting hole (11), and the limiting spring (13) is located outside the limiting plate (12) and is used to limit the movement of the limiting plate (12).

5. The anti-loosening gas flange connection device as described in claim 1, characterized in that, Each of the limiting plates (12) has a deformation groove (14) on its exterior. One end of the limiting spring (13) is fixedly connected to the inside of the deformation groove (14), and the other end extends outward.

6. The anti-loosening gas flange connection device as described in claim 1, characterized in that, Each of the aforementioned fixing frames (10) is provided with a limiting block (15) on its exterior to restrict the movement of the limiting spring (13).

7. The anti-loosening gas flange connection device as described in claim 1, characterized in that, Each of the aforementioned fixing brackets (10) has an external mounting groove (16); The limiting block (15) is snapped into the inside of the mounting groove (16), and the limiting block (15) is fixedly mounted with a protrusion (17) on the outside.

8. The anti-loosening gas flange connection device as described in claim 1, characterized in that, The first flange (1) and the second flange (2) are fitted together, and the bolts (4) pass through the bolt holes on the first flange (1) and the second flange (2) in sequence. The nuts (3) are threaded onto the ends of the bolts (4) to achieve the initial fixation of the first flange (1) and the second flange (2).

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