Device and method for detecting flange connection of pipeline

Abstract

The invention relates to the technical field of air tightness detection of flange connection parts, and is a detection device and method for pipeline flange connection parts. An upper half ring and a lower half ring can be sleeved on the outer side of the flange connection part of the pipeline. After the upper half ring and the lower half ring are fitted together, the inner sides of the upper half ring and the lower half ring can form an independent closed space. A connecting tube is fixedly connected to one side of the upper half ring or the lower half ring, and a turntable is rotatably connected to the inner side of one end of the upper half ring or the lower half ring. The invention can realize effective detection of slow air leakage of the flange connection part, and the detection sensitivity is relatively high. The sensitivity is improved in two ways. First, the leaked gas is accumulated in the closed space by the upper half ring and the lower half ring. Second, weight comparison is performed by a lever structure, so that the change of the power or power arm of a first lever arm caused by the gas after leakage in the closed space is compared with the change of the power or power arm of a second lever arm where the gas without leakage is located on the outer side.

Description

Technical Field

[0001] The present invention relates to the technical field of airtightness detection of flange connection parts, and in particular to a detection device and method for pipeline flange connection parts. Background Art

[0002] Pipelines are channels used to transport media such as gas or fluid. To form a flow channel, multiple pipes need to be spliced ​​together, and there is often a high transport pressure in the pipes.

[0003] After the pipelines are butt-jointed, a sealing test is required to prevent leakage at the butt joints, especially when a flowing medium containing hazardous substances needs to be transported through the pipelines.

[0004] Application number 202410275408.3 is a detection device and method for pipe docking. It is equipped with a central half ring, and a central airbag is fixedly connected to the inner side of the central half ring. The central airbag is also inflated and deflated through the valve core. The central airbag divides the gap into two left and right parts, one is arranged on the outside of the docking point of the pipe, and the other is arranged on the outside of the pipe. Because the moisture content of the original air in the two gaps is consistent, during the detection, the weight of the collection plates in the two gaps is compared, which can eliminate the measurement error caused by the original air in the gap and realize the collection and detection of the seepage amount at the docking point. The position sensor and slider are used to judge the tilt direction of the lever. When the lever is tilted, it indicates that there is seepage.

[0005] The above solution can only be used to implement penetration detection when the flowing medium is liquid, and cannot be applied to gas leakage detection when the flowing medium is gas, such as when the flowing medium is natural gas;

[0006] When the butted pipes are used to transport gas, if the leakage at the joint is very weak, the slowly leaking gas will be quickly diluted and diffused by the air. When the diameter of the pipe joint is large, it is difficult to achieve fixed-point detection through the detector because the location of the leak point is unknown, and it is difficult to achieve effective sealing monitoring.

[0007] Therefore, in order to solve the above problems, a detection device and method for pipeline flange connection parts are proposed. Summary of the Invention

[0008] The purpose of the present invention is to provide a detection device and method for pipeline flange connections to solve the problem raised in the above-mentioned background technology that "when the butted pipeline is used to transport gas, when the gas leakage at the butt joint is very weak, the slowly leaked gas is quickly diluted and diffused by the air; and when the diameter of the pipeline butt joint is large, it is difficult to achieve fixed-point detection through a detector because the location of the leak point is unknown, and it is difficult to achieve effective sealing monitoring."

[0009] To achieve the above-mentioned object, the present invention provides the following technical solution: a detection device for a flange connection portion of a pipeline, the detection device comprising an upper half ring and a lower half ring hinged at one end, the upper half ring and the lower half ring being capable of being sleeved on the outside of the flange connection portion of the pipeline, and when the upper half ring and the lower half ring are affixed, the inner sides of the upper half ring and the lower half ring are capable of forming an independent closed space;

[0010] One side of the upper or lower half ring is fixedly connected to a connecting tube, and the inner side of one end of the upper or lower half ring is rotatably connected to a turntable, and both ends of the turntable are respectively fixedly connected to a first lever arm and a second lever arm to form a lever mechanism, wherein the first lever arm is arranged on the inner side of the upper or lower half ring, and the second lever arm is arranged on the inner side of the connecting tube, and the length of the first lever arm is greater than that of the second lever arm, so as to increase the sensitivity of the lever structure to tilt when the first lever arm changes;

[0011] In the initial state, the first lever arm and the second lever arm are in a horizontal state. When there is slow air leakage in the flange connection, the power or power arm on the first lever arm will change, causing the lever structure to tilt to one side, thereby detecting whether there is air leakage in the flange connection.

[0012] The present invention can effectively detect slow gas leakage in flange connections, and has high detection sensitivity. The improved sensitivity is reflected in two aspects: first, leaked gas is accumulated in a closed space by the upper and lower half rings; second, a weight comparison is performed through a lever structure, so that the change in the power or power arm of a first lever arm caused by the gas leaking in the closed space is compared with the change in the power or power arm of a second lever arm where no gas leaks outside. Moreover, because the length of the first lever arm is greater than that of the second lever arm, the sensitivity of the lever structure tilting when the first lever arm changes is increased, thereby achieving accurate detection. The structure and operation are relatively simple.

[0013] As a preferred detection device for the pipeline flange connection part of the present invention, a rubber pad for achieving a sealing effect is fixedly connected to the corresponding contact surfaces of the upper half ring and the lower half ring, a buckle is connected to the upper half ring through a hinge rotation, and a groove is fixedly connected to one side of the lower half ring. The cooperation of the buckle and the groove can achieve the adhesion of the other end of the hinge of the upper half ring and the lower half ring, and the connecting tube is transparent.

[0014] As a detection device for a pipe flange connection part of the present invention, preferably, the outer side of the second lever arm is fixedly connected with a thread, and the outer side of the second lever arm is spirally connected with a balance block, and the position of the balance block is changed to achieve a balanced state of the first lever arm and the second lever arm in the initial state.

[0015] As a preferred detection device for the pipeline flange connection part of the present invention, a disc is spirally connected to the inner side of one end of the connecting cylinder, a screw is spirally connected to the inner side of the center of the disc, and a connecting disc is fixedly connected to one side of the screw. A limiting hole is provided at one end of the second lever arm, and the forward end of the screw can be embedded in the inner side of the limiting hole to achieve balance and stability of the second lever arm.

[0016] As a preferred detection device for the flange connection of the pipeline of the present invention, one end of the first lever arm is rotatably connected to a motor via a rotating shaft, a filter disc and fan blades are fixedly connected to the outer side of the output end of the motor, the inner side of the filter disc is filled with an adsorption element, and the fan blades are arranged on one side of the filter disc. When the flange connection is deflated, the adsorption element can adsorb the leaked gas to increase the power on the first lever arm to cause the lever mechanism to change.

[0017] As a preferred detection device for a pipe flange connection of the present invention, the adsorption element is activated carbon particles, the motor is an explosion-proof motor, a guide slope for increasing the diversion effect is fixedly connected to the inner edge of the upper half ring or the lower half ring, and a plurality of partition plates are evenly fixedly connected to the inner side of the filter disc. The storage space for the adsorption element is between adjacent partition plates and the inner wall of the filter disc. The adsorption element does not occupy the entire storage space. A flow hole is opened on the side of the partition plate close to the center of the filter disc. When the filter disc rotates, the adsorption element can flow in multiple storage spaces. When the motor rotates, the filter disc and the fan blades rotate synchronously. The fan blades allow the gas in the enclosed space to continuously pass through the filter disc. The guide slope can increase the circulation of the gas flow in the enclosed space, ensuring that the adsorption element can fully absorb. Because the adsorption element in the present invention does not occupy the entire storage space, a flow hole is opened on the side of the partition plate close to the center of the filter disc. When the filter disc rotates, the adsorption element can flow in multiple storage spaces. The position and angle of the adsorption element are changed by the flow of the adsorption element. When the gas in the enclosed space continuously passes through the filter disc, the adsorption element further fully absorbs the leaked gas.

[0018] The present invention provides a detection method. When in use, the upper half ring and the lower half ring are sleeved on the outside of the flange connection part of the pipeline, and the upper half ring and the lower half ring are fitted together by snapping. Then, the first lever arm and the second lever arm are placed in a balanced state by adjusting the position of the balance block. The screw is rotated so that the forward end of the screw is embedded in the inner side of the limiting hole to maintain the stability of the second lever arm. The motor is controlled to rotate so that the adsorption element in the filter disc fully absorbs the leaked gas, thereby increasing the power and maintaining it for a period of time. The screw is rotated so that the forward end of the screw moves out of the inner side of the limiting hole, and the inclination state of the second lever arm is observed. If the second lever arm is tilted upward, there is a gas leakage in the flange connection part.

[0019] As a preferred detection device for a pipeline flange connection part of the present invention, a slider is slidably connected to the inner side of the first lever arm, and the slider divides the left and right sides of the first lever arm into a second air cavity and a first air cavity. The second air cavity is in a closed state, and the inner side of the turntable is also hollow. The left end and the bottom end of the turntable are respectively provided with a first through hole and a second through hole, and the first through hole can connect the first air cavity and the inner side of the turntable.

[0020] As a preferred detection device for the pipeline flange connection of the present invention, a channel is opened on the inner side of the upper half ring or the lower half ring. In the initial state, the channel and the second through hole can connect the closed space formed in the upper half ring and the lower half ring with the inner side of the turntable. As the flange connection continues to deflate, the pressure in the closed space increases, and the slider slides toward the second air cavity, thereby increasing the power arm of the first lever arm.

[0021] The present invention also provides a detection method. When in use, the upper half ring and the lower half ring are placed on the outside of the flange connection part of the pipeline, and the upper half ring and the lower half ring are fitted together by snapping. Then, the position of the balance block is adjusted to make the first lever arm and the second lever arm be in a balanced state. The screw is rotated so that the forward end of the screw is embedded in the inner side of the limiting hole to maintain the stability of the second lever arm. After a period of time, the screw is rotated so that the forward end of the screw moves out of the inner side of the limiting hole, and the tilting state of the second lever arm is observed. If there is a gas leakage in the flange connection part, as the gas leakage continues to occur, the pressure in the enclosed space will increase. The pressure acts on the first air cavity through the channel, the second through hole, the inside of the turntable and the first through hole. The slider moves toward the direction of the second air cavity, and the power arm increases. At this time, the second lever arm will tilt upward, thereby realizing detection.

[0022] The method for detecting the flange connection of a pipeline comprises the following steps:

[0023] S1: Place the upper and lower half rings on the outside of the flange connection of the pipeline and fit them together by snapping them together;

[0024] S2: The first lever arm and the second lever arm are in a balanced state by adjusting the position of the balancing block;

[0025] S3: Rotate the screw rod so that the forward end of the screw rod is embedded in the inner side of the limiting hole to maintain the stability of the second lever arm;

[0026] S4: Control the motor to rotate so that the adsorption element in the filter disc fully absorbs the leaked gas and continues for a period of time;

[0027] S5: Turn the screw rod so that the forward end of the screw rod moves out of the inner side of the limit hole, and observe the tilt state of the second lever arm. If the second lever arm rod tilts upward, there is a gas leak in the flange connection.

[0028] The detection method for pipeline flange connection is characterized by:

[0029] S1: Place the upper and lower half rings on the outside of the flange connection of the pipeline and fit them together by snapping them together;

[0030] S2: The first lever arm and the second lever arm are in a balanced state by adjusting the position of the balancing block;

[0031] S3: Rotate the screw rod so that the forward end of the screw rod is embedded in the inner side of the limiting hole to maintain the stability of the second lever arm;

[0032] S4: lasts for a period of time;

[0033] S5: Turn the screw so that the forward end of the screw moves out of the inner side of the limit hole, and observe the tilt state of the second lever arm. If there is gas leakage in the flange connection, as the gas leakage continues, the pressure in the enclosed space will increase. The pressure acts on the first air cavity through the channel, the second through hole, the inside of the turntable and the first through hole. The slider moves away from the first lever arm, and the power arm increases. At this time, the second lever arm will tilt upward, thereby achieving detection.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The detection device for the flange connection of a pipeline according to the present invention can effectively detect slow gas leakage in the flange connection, and the detection sensitivity is relatively high. The sensitivity is improved in two ways. First, the leaked gas is accumulated in a closed space through the upper and lower half rings. Second, a weight comparison is performed through a lever structure, so that the change in the power or power arm of the first lever arm caused by the gas leaked in the closed space is compared with the change in the power or power arm of the second lever arm where the gas without leakage is located on the outside. Moreover, because the length of the first lever arm is greater than that of the second lever arm, the sensitivity of the lever structure tilting when the first lever arm changes is increased, thereby achieving accurate detection. The structure and operation are relatively simple.

[0036] 2. The detection device for the flange connection of the pipeline, when the motor rotates, the filter disc and the fan blades rotate synchronously, the fan blades allow the gas in the closed space to continuously pass through the filter disc, and the provided guide slope can increase the circulation of the gas flow in the closed space, ensuring that the adsorption element can fully absorb. Because the adsorption element in the present invention does not occupy the entire storage space, a flow hole is provided on the side of the partition plate close to the center of the filter disc. When the filter disc rotates, the adsorption element can flow in multiple storage spaces, and the position and angle of the adsorption element are changed by the flow of the adsorption element. When the gas in the closed space continuously passes through the filter disc, the adsorption element can further fully absorb the leaked gas.

[0037] 3. The detection device for the flange connection of the pipeline, the present invention provides a detection method. When in use, the upper half ring and the lower half ring are placed on the outside of the flange connection of the pipeline, and the upper half ring and the lower half ring are fitted together by snapping. Then, the position of the balance block is adjusted to make the first lever arm and the second lever arm be in a balanced state. The screw is rotated so that the forward end of the screw is embedded in the inner side of the limiting hole to maintain the stability of the second lever arm. The motor is controlled to rotate so that the adsorption element in the filter disc fully absorbs the leaked gas, thereby increasing the power and maintaining it for a period of time. The screw is rotated so that the forward end of the screw moves out of the inner side of the limiting hole, and the inclination state of the second lever arm is observed. If the second lever arm is tilted upward, there is a gas leakage in the flange connection.

[0038] 4. The detection device for the flange connection of the pipeline, when in use, the upper half ring and the lower half ring are placed on the outside of the flange connection of the pipeline, and the upper half ring and the lower half ring are fitted together by snapping, and then the position of the balance block is adjusted to make the first lever arm and the second lever arm be in a balanced state, and the screw is rotated so that the forward end of the screw is embedded in the inner side of the limiting hole to maintain the stability of the second lever arm. After a period of time, the screw is rotated so that the forward end of the screw moves out of the inner side of the limiting hole, and the tilting state of the second lever arm is observed. If there is a gas leak in the flange connection, as the gas leakage continues, the pressure in the enclosed space will increase, and the pressure acts on the first air cavity through the channel, the second through hole, the inside of the turntable and the first through hole. The slider moves toward the direction of the second air cavity, and the power arm increases. At this time, the second lever arm will tilt upward, thereby realizing detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of the installation position of the detection device of the present invention;

[0040] Figure 2 Schematic diagram of the appearance structure of the detection device of the present invention;

[0041] Figure 3 This is a schematic diagram of the structure of the detection device of the present invention after installation;

[0042] Figure 4 This is a schematic diagram of a cross-sectional installation structure of a first embodiment of the present invention;

[0043] Figure 5 This is a schematic cross-sectional view of the installation structure of the second embodiment of the present invention;

[0044] Figure 6 For the present invention Figure 4 Schematic diagram of the structure at A;

[0045] Figure 7 Schematic diagram of the cross-sectional installation structure of the filter disc of the present invention;

[0046] Figure 8 For the present invention Figure 5 Schematic diagram of the structure at B;

[0047] Figure 9 Schematic diagram of the appearance structure of the first lever arm in the first embodiment of the present invention;

[0048] Figure 10 Schematic diagram of the appearance structure of the first lever arm in the second embodiment of the present invention.

[0049] In the figure: 1. Pipe; 2. Flange connection; 3. Lower half ring; 4. Upper half ring; 5. Connecting tube; 6. Buckle; 7. Guide slope; 8. Rotating plate; 9. First lever arm; 10. Disc; 11. Screw; 12. Connecting plate; 13. Second lever arm; 14. Balance block; 15. Motor; 16. Fan blade; 17. Filter plate; 18. Limiting hole; 19. Slider; 20. Enclosed space; 21. First air cavity; 22. First through hole; 23. Passage; 24. Second through hole; 25. Second air cavity.

[0050] 171. Adsorption element; 172. Partition plate; 173. Storage space; 174. Flow hole. DETAILED DESCRIPTION

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0052] Example 1, please refer to Figures 1-4 、 Figure 6-Figure 7 and Figure 9 , the present invention provides a technical solution:

[0053] A detection device for a flange connection of a pipeline, the detection device comprising an upper half ring 4 and a lower half ring 3 hinged at one end, the upper half ring 4 and the lower half ring 3 being able to be sleeved on the outside of the flange connection 2 of the pipeline 1, and when the upper half ring 4 and the lower half ring 3 are attached, an independent closed space 20 can be formed inside the upper half ring 4 and the lower half ring 3;

[0054] A connecting tube 5 is fixedly connected to one side of the upper half ring 4 or the lower half ring 3. A turntable 8 is rotatably connected to the inner side of one end of the upper half ring 4 or the lower half ring 3. The two ends of the turntable 8 are respectively fixedly connected to a first lever arm 9 and a second lever arm 13 to form a lever mechanism. The first lever arm 9 is arranged on the inner side of the upper half ring 4 or the lower half ring 3, and the second lever arm 13 is arranged on the inner side of the connecting tube 5. The length of the first lever arm 9 is greater than that of the second lever arm 13, which is used to increase the sensitivity of the lever structure to tilt when the first lever arm 9 changes.

[0055] In the initial state, the first lever arm 9 and the second lever arm 13 are in a horizontal state. When there is slow air leakage in the flange connection part 2, the power or power arm on the first lever arm 9 will change, causing the lever structure to tilt to one side, thereby realizing the detection of whether there is air leakage in the flange connection part 2.

[0056] The present invention can effectively detect slow gas leakage from the flange connection 2 with high sensitivity. The improved sensitivity is reflected in two aspects: first, the leaked gas is accumulated in the closed space 20 by the upper half ring 4 and the lower half ring 3; second, a weight comparison is performed through the lever structure, so that the change in the power or power arm of the first lever arm 9 caused by the gas leaking in the closed space 20 is compared with the change in the power or power arm of the second lever arm 13 where the gas outside is not leaking. Moreover, because the length of the first lever arm 9 is greater than that of the second lever arm 13, the sensitivity of the lever structure tilt when the first lever arm 9 changes is increased, thereby achieving accurate detection. The structure and operation are relatively simple.

[0057] Specifically, a rubber pad for achieving sealing is fixedly connected to the corresponding contact surfaces of the upper half ring 4 and the lower half ring 3. A buckle 6 is connected to the upper half ring 4 through a hinge. A groove is fixedly connected to one side of the lower half ring 3. The cooperation of the buckle 6 and the groove can achieve the hinged connection between the upper half ring 4 and the lower half ring 3 at the other end. The connecting tube 5 is transparent.

[0058] Specifically, the outer side of the second lever arm 13 is fixedly connected with a thread, and the outer side of the second lever arm 13 is spirally connected with a balance block 14. By changing the position of the balance block 14, the balance state of the first lever arm 9 and the second lever arm 13 in the initial state is achieved.

[0059] Specifically, a disc 10 is spirally connected to the inner side of one end of the connecting tube 5, a screw 11 is spirally connected to the inner side of the center of the disc 10, a connecting disc 12 is fixedly connected to one side of the screw 11, and a limiting hole 18 is opened at one end of the second lever arm 13. The forward end of the screw 11 can be embedded in the inner side of the limiting hole 18 to achieve the balance and stability of the second lever arm 13.

[0060] Specifically, one end of the first lever arm 9 is rotatably connected to the motor 15 via a rotating shaft, and the outer side of the output end of the motor 15 is fixedly connected to a filter disc 17 and a fan blade 16. The inner side of the filter disc 17 is filled with an adsorption element 171, and the fan blade 16 is arranged on one side of the filter disc 17. When the flange connection part 2 is deflated, the adsorption element 171 can adsorb the leaked gas to increase the power on the first lever arm 9 to cause the lever mechanism to change.

[0061] Specifically, the adsorption element 171 is activated carbon particles, the motor 15 is an explosion-proof motor, the inner edge of the upper half ring 4 or the lower half ring 3 is fixedly connected with a guide slope 7 for increasing the diversion effect, the inner side of the filter disc 17 is evenly fixedly connected with a plurality of partition plates 172, and the storage space 173 for the adsorption element 171 is between adjacent partition plates 172 and the inner wall of the filter disc 17. The adsorption element 171 does not occupy the entire storage space 173. A flow hole 174 is opened on the side of the partition plate 172 close to the center of the filter disc 17. When the filter disc 17 rotates, the adsorption element 171 can flow in multiple storage spaces 173. When the motor 15 rotates, the filter disc 17 and the fan blades 16 rotate synchronously. The fan blades 16 allow the gas in the closed space 20 to continuously pass through the filter disc 17. The guide slope 7 provided can increase the circulation of the gas flow in the closed space 20, ensuring that the adsorption element 171 can fully absorb. Because the adsorption element 171 in the present invention does not occupy the entire storage space 173, a flow hole 174 is provided on the side of the partition plate 172 close to the center of the filter disc 17. When the filter disc 17 rotates, the adsorption element 171 can flow in multiple storage spaces 173. The position and angle of the adsorption element 171 are changed by the flow of the adsorption element 171. When the gas in the closed space 20 continuously passes through the filter disc 17, the adsorption element 171 can further fully absorb the leaked gas.

[0062] The present invention provides a detection method. When in use, the upper half ring 4 and the lower half ring 3 are sleeved on the outside of the flange connection part 2 of the pipeline 1, and the upper half ring 4 and the lower half ring 3 are fitted together by the buckle 6. Then, by adjusting the position of the balance block 14, the first lever arm 9 and the second lever arm 13 are in a balanced state. The screw 11 is rotated so that the forward end of the screw 11 is embedded in the inner side of the limiting hole 18 to maintain the stability of the second lever arm 13. The motor 15 is controlled to rotate so that the adsorption element 171 in the filter disc 17 fully absorbs the leaked gas, thereby increasing the power and maintaining it for a period of time. The screw 11 is rotated so that the forward end of the screw 11 moves out of the inner side of the limiting hole 18, and the tilt state of the second lever arm 13 is observed. If the second lever arm 13 tilts upward, there is a gas leakage in the flange connection part 2.

[0063] Among them, when the density of the gas transmitted in the pipeline 1 is less than that of air, such as natural gas, the lever mechanism of the present invention is placed at the upper side of the closed space 20 to increase the adsorption effect of the adsorption element 171. When the density of the gas transmitted in the pipeline 1 is greater than that of air, such as butane, the lever mechanism of the present invention is placed at the lower side of the closed space 20 to increase the adsorption effect of the adsorption element 171.

[0064] This embodiment also discloses a method for detecting a pipe flange connection, the steps of which are:

[0065] S1: Slide the upper half ring 4 and the lower half ring 3 onto the outside of the flange connection 2 of the pipe 1, and fit the upper half ring 4 and the lower half ring 3 together using the buckle 6;

[0066] S2: The first lever arm 9 and the second lever arm 13 are in a balanced state by adjusting the position of the balancing block 14;

[0067] S3: Rotate the screw rod 11 so that the forward end of the screw rod 11 is embedded in the inner side of the limiting hole 18 to maintain the stability of the second lever arm 13;

[0068] S4: Control the motor 15 to rotate so that the adsorption element 171 in the filter disc 17 fully absorbs the leaked gas for a period of time;

[0069] S5: Rotate the screw rod 11 to move the forward end of the screw rod 11 out of the inner side of the limiting hole 18 and observe the tilting state of the second lever arm 13. If the second lever arm 13 tilts upward, there is gas leakage in the flange connection part 2.

[0070] Example 2: This example is an alternative to Example 1. The same parts will not be repeated here. The difference is: Figure 1-Figure 3 、 Figure 5 、 Figure 8 and Figure 10 ;

[0071] The inner side of the first lever arm 9 is slidably connected with a slider 19, which divides the left and right sides of the first lever arm 9 into a second air cavity 25 and a first air cavity 21. The second air cavity 25 is in a closed state. The inner side of the turntable 8 is also hollow. The left end and the bottom end of the turntable 8 are respectively provided with a first through hole 22 and a second through hole 24. The first through hole 22 can connect the first air cavity 21 and the inner side of the turntable 8.

[0072] Specifically, a channel 23 is opened on the inner side of the upper half ring 4 or the lower half ring 3. In the initial state, the channel 23 and the second through hole 24 can connect the closed space 20 formed in the upper half ring 4 and the lower half ring 3 with the inner side of the turntable 8. As the flange connection part 2 continues to deflate, the pressure in the closed space 20 increases, and the slider 19 slides toward the second air cavity 25, thereby increasing the power arm of the first lever 9.

[0073] The present invention also provides a detection method. When in use, the upper half ring 4 and the lower half ring 3 are sleeved on the outside of the flange connection part 2 of the pipeline 1, and the upper half ring 4 and the lower half ring 3 are fitted together by the buckle 6. Then, by adjusting the position of the balance block 14, the first lever arm 9 and the second lever arm 13 are in a balanced state, and the screw 11 is rotated so that the forward end of the screw 11 is embedded in the inner side of the limiting hole 18 to maintain the stability of the second lever arm 13. After a period of time, the screw 11 is rotated so that the forward end of the screw 11 moves out of the inner side of the limiting hole 18, and the tilting state of the second lever arm 13 is observed. If there is a gas leak in the flange connection part 2, as the gas leakage continues, the pressure in the closed space 20 will increase, and the pressure will act on the first air cavity 21 through the channel 23, the second through hole 24, the inside of the turntable 8 and the first through hole 22. The slider 19 moves toward the direction of the second air cavity 25, and the power arm increases. At this time, the second lever arm 13 will tilt upward, thereby realizing detection.

[0074] This embodiment also discloses a method for detecting a pipe flange connection, which is characterized by:

[0075] S1: Slide the upper half ring 4 and the lower half ring 3 onto the outside of the flange connection 2 of the pipe 1, and fit the upper half ring 4 and the lower half ring 3 together using the buckle 6;

[0076] S2: The first lever arm 9 and the second lever arm 13 are in a balanced state by adjusting the position of the balancing block 14;

[0077] S3: Rotate the screw rod 11 so that the forward end of the screw rod 11 is embedded in the inner side of the limiting hole 18 to maintain the stability of the second lever arm 13;

[0078] S4: lasts for a period of time;

[0079] S5: Turn the screw 11 so that the forward end of the screw 11 moves out of the inner side of the limit hole 18, and observe the tilt state of the second lever arm 13. If there is gas leakage in the flange connection part 2, as the gas leakage continues, the pressure in the closed space 20 will increase. The pressure acts on the first air cavity 21 through the channel 23, the second through hole 24, the inside of the turntable 8 and the first through hole 22. The slider 19 moves away from the first lever arm 9, and the power arm increases. At this time, the second lever arm 13 will tilt upward, thereby realizing detection.

[0080] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A detection device for a pipe flange connection, characterized in that: The detection device comprises an upper half ring (4) and a lower half ring (3) hinged at one end, wherein the upper half ring (4) and the lower half ring (3) can be sleeved on the outside of the flange connection portion (2) of the pipeline (1), and when the upper half ring (4) and the lower half ring (3) are fitted together, an independent closed space (20) can be formed inside the upper half ring (4) and the lower half ring (3); A connecting tube (5) is fixedly connected to one side of the upper half ring (4) or the lower half ring (3); a rotating disk (8) is rotatably connected to the inner side of one end of the upper half ring (4) or the lower half ring (3); two ends of the rotating disk (8) are respectively fixedly connected to a first lever arm (9) and a second lever arm (13) to form a lever mechanism; the first lever arm (9) is arranged on the inner side of the upper half ring (4) or the lower half ring (3); the second lever arm (13) is arranged on the inner side of the connecting tube (5); the length of the first lever arm (9) is greater than the length of the second lever arm (13), so as to increase the sensitivity of the lever structure to tilt when the first lever arm (9) changes; In the initial state, the first lever arm (9) and the second lever arm (13) are in a horizontal state. When there is a slow air leak in the flange connection part (2), the power or power arm on the first lever arm (9) will change, causing the lever structure to tilt to one side, thereby realizing detection of whether there is air leak in the flange connection part (2); The inner side of the first lever arm (9) is slidably connected to a slider (19), the slider (19) divides the left and right sides of the first lever arm (9) into a second air cavity (25) and a first air cavity (21), the second air cavity (25) is in a closed state, the inner side of the turntable (8) is also hollow, the left end and the bottom end of the turntable (8) are respectively provided with a first through hole (22) and a second through hole (24), the first through hole (22) can connect the first air cavity (21) and the inner side of the turntable (8); A channel (23) is provided on the inner side of the upper half ring (4) or the lower half ring (3). In an initial state, the channel (23) and the second through hole (24) can connect the closed space (20) formed in the upper half ring (4) and the lower half ring (3) with the inner side of the turntable (8). As the flange connection part (2) continues to leak air, the pressure in the closed space (20) increases, and the slider (19) slides toward the second air chamber (25), thereby increasing the power arm of the first lever arm (9).

2. The detection device for pipeline flange connection according to claim 1, characterized in that: A rubber pad for achieving a sealing effect is fixedly connected to the contact surfaces corresponding to the upper half ring (4) and the lower half ring (3); a buckle (6) is rotatably connected to the upper half ring (4) via a hinge; a groove is fixedly connected to one side of the lower half ring (3); the other end of the upper half ring (4) and the lower half ring (3) can be tightly attached to each other by the cooperation of the buckle (6) and the groove; and the connecting tube (5) is transparent.

3. The detection device for pipeline flange connection according to claim 2, characterized in that: The outer side of the second lever arm (13) is fixedly connected with a thread, and the outer side of the second lever arm (13) is spirally connected with a balance block (14), and the position of the balance block (14) is changed to achieve a balanced state of the first lever arm (9) and the second lever arm (13) in an initial state.

4. The detection device for pipeline flange connection according to claim 3, characterized in that: A disc (10) is spirally connected to the inner side of one end of the connecting tube (5); a screw rod (11) is spirally connected to the inner side of the center of the disc (10); a connecting disc (12) is fixedly connected to one side of the screw rod (11); a limiting hole (18) is provided at one end of the second lever arm (13); and the forward end of the screw rod (11) can be embedded in the inner side of the limiting hole (18) to achieve balance and stability of the second lever arm (13).

5. A method for detecting a pipe flange connection, characterized in that: Using the device as claimed in claim 4, the steps are: S1: The upper half ring (4) and the lower half ring (3) are sleeved onto the outer side of the flange connection portion (2) of the pipeline (1), and the upper half ring (4) and the lower half ring (3) are fitted together by means of a buckle (6); S2: adjusting the position of the balancing block (14) so ​​that the first lever arm (9) and the second lever arm (13) are in a balanced state; S3: rotating the screw rod (11) so that the forward end of the screw rod (11) is embedded in the inner side of the limiting hole (18) to maintain the stability of the second lever arm (13); S4: lasts for a period of time; S5: Rotate the screw rod (11) so that the forward end of the screw rod (11) moves out of the inner side of the limit hole (18), and observe the tilting state of the second lever arm (13). If there is gas leakage in the flange connection part (2), as the gas leakage continues to occur, the pressure in the closed space (20) will increase, and the pressure will act on the first air cavity (21) through the channel (23), the second through hole (24), the inside of the turntable (8) and the first through hole (22). The slider (19) moves in a direction away from the first lever arm (9), and the power arm increases. At this time, the second lever arm (13) will tilt upward, thereby achieving detection.

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