A detection device for geothermal pipeline

Abstract

The invention discloses a detection device for geothermal pipelines in the field of geothermal pipeline detection technology, comprising a detection part, both ends of which can be fitted with the pipe wall; the detection part comprises: a front side plate and a rear side plate, both of which are provided with grooves in the middle of the front side plate and the rear side plate; a sealing airbag installed in the groove; a telescopic airbag, both ends of which are respectively connected to the front side plate and the rear side plate, and are communicated with the sealing airbag; an air guide pipe, the end of which is fixed to the front side plate, and an air inlet and outlet are provided at one end of the side wall of the air guide pipe close to the front side plate; an air inlet check valve, which is installed in the middle of the front side plate, and gas can enter the telescopic airbag through the front side plate; a control valve, which can maintain a constant air pressure in the telescopic airbag; a gas flow meter, which is used to measure the outflow of gas in the air guide pipe per unit time; by isolating the pipeline, first quickly compressing it to confirm the initial leakage point position, and then forming a local blockage in the pipeline, the leakage point of the geothermal pipeline is accurately checked for a second time, thereby improving the leakage detection accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of geothermal pipeline detection, and in particular to a geothermal pipeline detection device. Background Art

[0002] Now many communities in the north have realized centralized heating, which has improved the quality of life of residents. Since geothermal pipes are pre-buried underground during renovation, they are prone to leakage due to various reasons. For example, material aging, internal corrosion, decoration damage, thermal expansion and contraction, etc. may all cause pipeline leakage. Pipeline leakage needs to be detected and repaired in time. Since the pipeline is pre-buried underground, the pipeline leakage point cannot be found intuitively, and generally requires auxiliary detection by devices. The most commonly used existing detection devices are infrared thermal imaging and pressure testing.

[0003] The pressure test method is to inject pressure into the geothermal pipe system and observe the pressure changes to determine whether the pipe is leaking. When there is a leak in the geothermal pipe, the pressure in the system will gradually decrease over time. Although the pressure test can determine whether the pipe is leaking, the exact location of the leak still needs further detection;

[0004] The infrared thermal imaging method uses an infrared thermal imager to scan the ground and determine the leak point based on the abnormal temperature area; however, the underground temperature is easily affected by many factors, such as the state of the floor heating system, the performance of the infrared thermal imager, the operating environment and skills, and the characteristics of the floor heating pipes. As a result, the temperature difference between the leaking point and other areas is not obvious, and the pipes need to continue to be used, which will further lead to increased water accumulation and aggravate the harm of leakage. Summary of the invention

[0005] The technical problem of the present invention is to provide a detection device for geothermal pipelines.

[0006] To achieve the above object, the present invention provides the following technical solution: a detection device for a geothermal pipeline, comprising a detection part, both ends of which can be attached to the pipe wall, and the detection part comprises:

[0007] A front side plate and a rear side plate, wherein the middle parts of the front side plate and the rear side plate are both provided with grooves;

[0008] A sealing airbag is installed in the groove, and when the sealing airbag is expanded, the outer end can expand and contract the groove and fit into the tube wall;

[0009] The telescopic airbag has two ends respectively connected to the front side plate and the rear side plate and communicated with the sealing airbag;

[0010] The end of the air guide tube is fixed to the front side plate, and an air inlet and an air outlet are provided at one end of the side wall of the air guide tube close to the front side plate; the air guide tube is connected to the telescopic air bag through the air inlet and an air outlet;

[0011] The air intake check valve is installed in the middle of the front side panel, so that the gas can enter the telescopic airbag through the front side panel;

[0012] The control valve is installed at the outer end of the air guide tube, and is used to discharge the gas in the telescopic airbag and maintain a constant air pressure in the telescopic airbag;

[0013] The gas flow meter is installed at the outer end of the airway pipe and is used to measure the gas outflow in the airway pipe per unit time.

[0014] As a further solution of the present invention, the air duct and the rear side plate are respectively connected with an inner connection part and an outer connection part through a quick connector, and the inner connection part and the outer connection part can move relatively to change the distance between the front side plate and the rear side plate.

[0015] As a further solution of the present invention, it also includes a driving structure, which controls the movement of the rear side plate outside the pipeline through the external connection part;

[0016] The driving structure comprises:

[0017] A housing, wherein a slider is slidably disposed in the housing, and the slider is fixed with a lower clamping plate via a connecting rod;

[0018] The upper clamping plate is slidably arranged between the slider and the lower clamping plate through a connecting rod, and a return spring is arranged between the upper clamping plate and the slider;

[0019] A reciprocating screw rod is rotatably arranged in the housing and is sleeved with a sliding sleeve slidably arranged with the housing. A pin is elastically arranged on the side wall of the sliding sleeve, and the pin can cooperate with the screw groove of the reciprocating screw rod;

[0020] A driving plate, wherein the top of the driving plate is rotatably arranged at the bottom of the sliding sleeve, a sliding groove is arranged in the middle of the driving plate, a cross bar fixedly arranged with the sliding block is slidably arranged in the sliding groove, and the bottom of the driving plate can contact with the upper clamping plate;

[0021] The driving motor is used to drive the reciprocating screw to rotate.

[0022] As a further solution of the present invention, the control valve comprises:

[0023] a valve body, communicated with the inner connection portion;

[0024] The reducing part is fixed in the valve body, with an air inlet section and an exhaust section on both sides, and a constant pressure section in the middle;

[0025] A sealing plate is slidably disposed in the reducing portion and is used to control the opening and closing of the inner connecting portion;

[0026] A pressure regulating spring is fixedly arranged between the pressure regulating part and the sealing plate, and the pressure regulating part is rotatably provided with a screw threadedly connected with the valve body.

[0027] As a further solution of the present invention, a limiting sleeve is fixedly provided at the end of the outer connecting part, and a limiting structure is arranged between the limiting sleeve and the valve body, and the limiting structure can relatively fix the outer connecting part and the inner connecting part; the limiting structure includes:

[0028] The connecting ear is fixed between the valve body;

[0029] A plug-in connector, plugged into the limit sleeve;

[0030] The limiting rod is fixed to the connecting ear and the connector through a nut.

[0031] As a further solution of the present invention, a speed regulator is provided between the driving motor and the reciprocating screw rod, and the speed regulator can adjust the rotation speed of the reciprocating screw rod, and the speed regulator includes:

[0032] A fixed cone wheel is coaxially fixedly arranged with the reciprocating screw rod and the output shaft of the driving motor;

[0033] The movable cone wheel is slidably arranged coaxially with the reciprocating screw rod and the output shaft of the driving motor through a key;

[0034] The transmission belt has two ends arranged between the fixed cone wheel and the movable cone wheel;

[0035] An elastic member is rotatably disposed between the drive motor and the housing, and is used to push the movable cone wheel that is coaxially slidably disposed with the output shaft of the drive motor toward the fixed cone wheel;

[0036] The triggering member is slidably arranged with the shell and can be pushed by the connecting ear to make the movable cone wheel slidably arranged coaxially with the reciprocating screw rod approach the fixed cone wheel.

[0037] As a further solution of the present invention, the telescopic airbag comprises:

[0038] The connecting rings are distributed in a linear array, and the connecting rings on both sides are fixed on the front side plate and the rear side plate respectively, and the side walls of the connecting rings are fixed with bosses;

[0039] The telescopic parts are distributed in a linear array and are alternately arranged between the connecting rings, and both ends of the telescopic parts are provided with connecting parts;

[0040] The gland is threadedly arranged on the connecting ring and can connect the telescopic part to the connecting ring through the connecting part.

[0041] As a further solution of the present invention, the front side plate and the rear side plate each include a fixed portion and a movable portion, the fixed portion is fixed with a convex ring, and the convex ring is connected to the movable portion by a fastening bolt.

[0042] As a further solution of the present invention, a buckle for limiting the movement of the connecting ear is installed at the end of the shell.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] In the present invention, the pipeline is cut off by a sealing airbag, and the detection part is driven to move rapidly as a whole, compressing the space between the detection part and the plug. When the front end of the detection part does not pass the leak point, part of the gas discharged from the compressed space is discharged through the leak point, and part passes through the telescopic airbag and the air guide tube. The gas passing through the gas flowmeter is only part of the gas in the pipeline space compressed by the detection part. When the front end of the detection part passes the leak point, the gas passing through the gas flowmeter is all the gas in the pipeline space compressed by the detection part. The amount of gas passing through the gas flowmeter increases significantly, thereby realizing a quick preliminary confirmation of the leak point location.

[0045] In the present invention, by increasing the pressure in the sealing airbag and raising the upper limit of the constant pressure in the telescopic airbag, the friction between the sealing airbag and the tube wall is increased, thereby improving the sealing effect of the sealing airbag; the rear side plate is driven alone to slowly move toward the front side plate, and when the rear side plate has not passed the leak point, the gas inside the outer cavity is discharged from the pipeline through the leak point, and the pressure difference between the inside and outside of the telescopic airbag can be kept balanced, and the gas discharged from the inner cavity is only the gas compressed by the axial deformation of the telescopic airbag caused by the displacement of the rear side plate; when the rear side plate passes the leak point, the gas in the outer cavity cannot be discharged, resulting in a pressure difference between the inside and outside of the telescopic airbag, causing the telescopic airbag to be radially compressed, the internal pressure of the telescopic airbag increases rapidly, the gas passing through the gas flowmeter increases, and the rear side plate stops moving. At this time, the position of the rear side plate is the leak point position, so that the leak point position can be further confirmed. After confirmation on both sides, the progress of the leak point can be further accurately determined. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0047] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0048] Figure 2 For the present invention Figure 1 The enlarged structural diagram at A in the middle;

[0049] Figure 3 It is a schematic diagram of the cross-sectional structure of the airway tube of the present invention;

[0050] Figure 4 Schematic diagram of the structure of the airway tube in different states of the present invention;

[0051] Figure 5 For the present invention Figure 3 The enlarged structural diagram at B in the middle;

[0052] Figure 6 For the present invention Figure 3 The enlarged structural diagram at C in the middle;

[0053] Figure 7 It is a schematic diagram of the cross-sectional structure of the driving structure of the present invention;

[0054] Figure 8 This is a schematic diagram of the structure of the slider and its connection relationship of the present invention;

[0055] Fig. 9 It is a schematic diagram of the structure of the reciprocating screw rod and its connection relationship of the present invention;

[0056] Fig.10 This is a schematic diagram of the motion state structure of the control valve of the present invention;

[0057] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0058] 1. Detection part; 11. Front side plate; 12. Rear side plate; 13. Sealing airbag; 2. Telescopic airbag; 21. Connecting ring; 22. Boss; 23. Telescopic part; 24. Connecting part; 25. Gland; 3. Air guide tube; 31. Inlet and outlet; 33. Inlet check valve; 34. Internal connecting part; 35. External connecting part; 4. Control valve; 41. Valve body; 42. Variable diameter part; 421. Inlet section; 422. Exhaust section; 423. Constant pressure section; 43. Sealing plate; 44. Pressure regulating part; 45. Pressure regulating spring; 5. Gas flow meter ; 6. Driving structure; 61. Housing; 62. Slider; 63. Connecting rod; 64. Lower clamping plate; 65. Upper clamping plate; 66. Return spring; 67. Cross bar; 68. Driving motor; 71. Reciprocating screw rod; 72. Sliding sleeve; 73. Pin; 74. Driving plate; 75. Slide groove; 8. Limiting structure; 81. Connecting ear; 82. Connector; 83. Limiting rod; 84. Limiting sleeve; 9. Speed ​​regulator; 91. Fixed cone wheel; 92. Movable cone wheel; 93. Transmission belt; 94. Elastic member; 95. Trigger member; 10. Buckle. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0060] See also Figure 1-Figure 10, the present invention provides a technical solution: a detection device for a geothermal pipeline, comprising a detection part 1, both ends of the detection part 1 can be attached to the pipe wall;

[0061] Before detecting the leak in the pipeline, use a plug to plug one end of the pipeline, insert the detection unit 1 into the pipeline from the other end, and push the detection unit 1 at a constant speed through the device;

[0062] The detection unit 1 comprises:

[0063] A front side plate 11 and a rear side plate 12, wherein the front side plate 11 and the rear side plate 12 are both provided with grooves in the middle;

[0064] A sealing airbag 13 is installed in the groove, and when the sealing airbag 13 is expanded, the outer end can expand and contract the groove and fit the tube wall;

[0065] The telescopic airbag 2 has two ends connected to the front side plate 11 and the rear side plate 12 respectively, and is communicated with the sealing airbag 13;

[0066] The end of the air guide tube 3 is fixed to the front side plate 11, and an air inlet and outlet 31 is provided at one end of the side wall of the air guide tube 3 close to the front side plate 11; the air guide tube 3 is connected to the telescopic airbag 2 through the air inlet and outlet 31;

[0067] An air intake check valve 33 is installed in the middle of the front side plate 11, so that the gas can enter the telescopic airbag 2 through the front side plate 11;

[0068] The control valve 4 is installed at the outer end of the air guide tube 3, and is used to discharge the gas in the telescopic airbag 2 and maintain a constant air pressure in the telescopic airbag 2;

[0069] The gas flow meter 5 is installed at the outer end of the air guide tube 3 and is used to measure the gas outflow in the air guide tube 3 per unit time;

[0070] Before the detection part 1 is inserted into the pipeline, the control valve 4 is used to pressurize the inside of the telescopic airbag 2 and the sealing airbag 13, so that the sealing airbag 13 and the telescopic airbag 2 expand, and the rear side plate 12 and the front side plate 11 move away from each other. At the same time, the sealing airbag 13 extends out of the groove, and the sealing airbag 13 can fill the gap between the front side plate 11, the rear side plate 12 and the pipe wall, thereby blocking one end of the pipe;

[0071] At the same time, the rear side plate 12 and the front side plate 11 are driven to move into the pipeline (or the air guide pipe 3 and the rear side plate 12 are temporarily fixed relatively). Since the other end of the pipeline is blocked by the plug, the space in the pipeline of the front side plate 11 is compressed, and the air pressure in the pipeline between the front side plate 11 and the plug increases. There is a pressure difference between the inside and outside of the air intake check valve 33, so that the air intake check valve 33 is opened, and part of the exhausted gas enters the telescopic airbag 2 through the front side plate 11, and the exhausted gas is directly discharged from the pipeline through the leakage point. As part of the gas enters the telescopic airbag 2, the air pressure inside it slowly increases, and the air pressure in the telescopic airbag 2 exceeds the constant pressure (the pressure at which the sealing airbag 13 can seal the pipeline), and the air guide pipe 3 guides the gas to the control valve 4 and slowly discharges part of the gas, reducing the air pressure in the telescopic airbag 2 to a constant pressure, so that the sealing airbag 13 can maintain the sealing effect;

[0072] When the front side plate 11 passes over the leak point, all the exhausted gas between the front side plate 11 and the plug enters the telescopic airbag 2 through the air inlet non-return valve 33, and the air pressure in the telescopic airbag 2 rises rapidly. The control valve 4 quickly discharges the gas exceeding the constant pressure, and reduces the air pressure in the telescopic airbag 2 to the constant pressure again. In addition, as all the exhausted gas enters the telescopic airbag 2, the sealing airbag 13 expands and increases the friction with the pipe wall, slowing down the forward speed of the detection part 1 and preventing the rear side plate 12 from passing over the leak point; the exhausted gas will all pass through the gas flowmeter 5. When the gas flow through the gas flowmeter 5 increases, the rear side plate 12 is stopped from being driven forward, the upper limit of the constant pressure in the telescopic airbag 2 is increased, and the telescopic airbag 2 is pressurized through the control valve 4 to further fit the sealing airbag 13 to the pipe wall; the preliminary positioning of the pipeline leak point is completed;

[0073] The space between the inner wall of the telescopic airbag 2 and the front side plate 11 and the rear side plate 12 is the inner cavity, and the space between the outer wall of the telescopic airbag 2 and the front side plate 11, the rear side plate 12 and the tube wall is the outer cavity;

[0074] Drive the rear side plate 12 to move toward the front side plate 11 alone, the gas in the inner cavity and the outer cavity will be compressed, the gas in the outer cavity can be discharged through the leak point, and the gas pressure inside the inner cavity exceeds the constant pressure and is discharged through the gas guide pipe 3 and the gas flow meter 5;

[0075] When the rear side plate 12 passes over the leak point, the gas in the outer cavity cannot be discharged, and will compress the telescopic airbag 2. At this time, the gas discharged through the air guide pipe 3 via the gas flow meter 5 includes the gas compressed by the axial deformation of the telescopic airbag 2 and the gas compressed by the radial contraction of the telescopic airbag 2. The gas passing through the gas flow meter 5 increases, so that the leak point position can be further confirmed. After confirmation on both sides, the leak point position can be further accurately determined.

[0076] In summary, first, the pipeline is cut off by the sealing airbag 13, and the detection part 1 is driven to move quickly as a whole, compressing the space between the detection part 1 and the plug. When the front end of the detection part 1 does not pass the leak point, part of the gas discharged from the compressed space is discharged through the leak point, and part passes through the telescopic airbag 2 and the air guide tube 3, and is discharged after passing through the gas flow meter 5. At this time, the gas passing through the gas flow meter 5 is only part of the gas in the pipeline space compressed by the detection part 1. When the front end of the detection part 1 passes the leak point, the gas passing through the gas flow meter 5 is all the gas in the pipeline space compressed by the detection part 1. The amount of gas passing through the gas flow meter 5 is significantly increased, so that the preliminary confirmation of the leak point position can be achieved quickly.

[0077] Then, the pressure is increased in the sealing airbag 13 and the upper limit of the constant pressure in the telescopic airbag 2 is increased, so that the friction between the sealing airbag 13 and the tube wall is increased, thereby improving the sealing effect of the sealing airbag 13; the rear side plate 12 is driven alone to slowly move toward the front side plate 11 (that is, the rear end of the detection part 1 approaches the front end). When the rear side plate 12 has not passed the leakage point, the gas inside the outer cavity is discharged through the leakage point discharge pipeline, so that the pressure difference between the inside and outside of the telescopic airbag 2 can be balanced, and the gas discharged from the inner cavity is only the gas compressed by the axial deformation of the telescopic airbag 2 caused by the displacement of the rear side plate 12; when the rear side plate 12 passes the leakage point, the gas in the outer cavity cannot be discharged, and the gas in the telescopic airbag 2 is continuously discharged, resulting in a pressure difference between the inside and outside of the telescopic airbag 2, so that the telescopic airbag 2 is radially compressed, and the internal pressure of the telescopic airbag 2 increases rapidly. At this time, the gas passing through the gas flowmeter 5 increases, and the rear side plate 12 stops moving. At this time, the position of the rear side plate 12 is the leakage point position, so that the leakage point position can be further confirmed. After confirmation on both sides, the progress of the leakage point can be further accurately determined.

[0078] As a further solution of the present invention, the air duct 3 and the rear side plate 12 are respectively connected with an inner connection part 34 and an outer connection part 35 through a quick connector, and the inner connection part 34 and the outer connection part 35 can move relative to each other to change the distance between the front side plate 11 and the rear side plate 12;

[0079] For details, see Figure 2 and Figure 3 , the inner connecting portion 34 and the outer connecting portion 35 can drive the air guide tube 3 outside the pipeline, reducing the difficulty of driving the air guide tube 3 and the rear side plate 12;

[0080] As a further solution of the present invention, it also includes a driving structure 6, and the driving structure 6 controls the movement of the rear side plate 12 outside the pipeline through the external connection part 35;

[0081] The driving structure 6 comprises:

[0082] A housing 61, wherein a slider 62 is slidably disposed in the housing 61, and the slider 62 is fixed with a lower clamping plate 64 via a connecting rod 63;

[0083] The upper clamping plate 65 is slidably disposed between the slider 62 and the lower clamping plate 64 via the connecting rod 63, and a return spring 66 is disposed between the upper clamping plate 65 and the slider 62;

[0084] The reciprocating screw rod 71 is rotatably disposed in the housing 61 and is sleeved with a sliding sleeve 72 that is slidably disposed with the housing 61. The side wall of the sliding sleeve 72 is elastically provided with a pin 73 that can cooperate with the screw groove of the reciprocating screw rod 71.

[0085] A driving plate 74, the top of which is rotatably arranged at the bottom of the sliding sleeve 72, a sliding groove 75 is arranged in the middle of the driving plate 74, a cross bar 67 fixedly arranged with the slider 62 is slidably arranged in the sliding groove 75, and the bottom of the driving plate 74 can contact with the upper clamping plate 65;

[0086] A driving motor 68 is used to drive the reciprocating screw rod 71 to rotate;

[0087] For details, see Figure 7-Figure 9 The drive motor 68 drives the reciprocating screw rod 71 to rotate, and the reciprocating screw rod 71 drives the sleeve 72 to reciprocate along the length direction of the housing 61 through the pin 73; see Figure 8 When the sliding sleeve 72 moves to the left, the sliding sleeve 72 drives the top of the driving plate 74 to move, and the driving plate 74 rotates around the axis of the cross bar 67. At the same time, the sliding groove 75 in the middle of the driving plate 74 moves and rotates relative to the cross bar 67, and the driving plate 74 squeezes the upper clamping plate 65 and the lower clamping plate 64, and the distance between the upper clamping plate 65 and the lower clamping plate 64 is shortened, thereby compressing and clamping the outer connecting portion 35 and the inner connecting portion 34 located therein; after the upper clamping plate 65 and the lower clamping plate 64 are fully clamped, the bottom of the driving plate 74 cannot Continue to descend, the driving plate 74 drives the slider 62 to move through the crossbar 67, and the slider 62 drives the outer connecting part 35 and the inner connecting part 34 to move through the upper clamping plate 65 and the lower clamping plate 64, thereby driving the detection part 1 to move into the tube; when the sliding sleeve 72 moves to the right, the sliding sleeve 72 drives the top of the driving plate 74 to move, and the driving plate 74 rises as a whole and rotates clockwise, the pressure on the upper clamping plate 65 is cancelled, and the reset spring 66 rebounds, so that the upper clamping plate 65 is away from the lower clamping plate 64, and the outer connecting part 35 is released;

[0088] To summarize, when the sleeve 72 moves to the left, the upper clamp 65 and the lower clamp 64 move closer to each other, clamping the external connection part 35 and driving it to move synchronously; when the sleeve 72 moves to the right, the upper clamp 65 and the lower clamp 64 move away from each other, and the external connection part 35 stops moving, thereby realizing intermittent driving of the detection part 1 to move. On the one hand, sufficient time is given to the gas to discharge, thereby preventing the air pressure between the detection part 1 and the plug from being too high, thereby breaking the pipeline or expanding the leakage point; on the other hand, the detection is divided into several sections, which can enable preliminary positioning in the rapid detection stage.

[0089] Both the outer connecting portion 35 and the inner connecting portion 34 are provided with arc-shaped portions, which can prevent the inner connecting portion 34 from being unable to pass gas and thus affecting the exhaust of the telescopic airbag 2 to the outside.

[0090] As a further solution of the present invention, the control valve 4 comprises:

[0091] The valve body 41 is communicated with the inner connecting portion 34;

[0092] The diameter reducing portion 42 is fixedly arranged in the valve body 41, with an air inlet section 421 and an air outlet section 422 on both sides, and a constant pressure section 423 in the middle;

[0093] The sealing plate 43 is slidably disposed in the diameter-changing portion 42 and is used to control the opening and closing of the inner connecting portion 34;

[0094] A pressure regulating member 44 is provided with a pressure regulating spring 45 fixedly disposed between the sealing plate 43, and the pressure regulating member 44 is rotatably provided with a screw threadedly connected to the valve body 41;

[0095] For details, see Figure 2 and Fig.10 When the telescopic airbag 2 is pressurized, the valve body 41 is inflated and pressurized on the side close to the pressure regulating member 44. As the pressure increases, the sealing plate 43 moves upward (see Fig.10 ) moves, the sealing plate 43 moves to the air inlet section 421, and the gas enters the telescopic airbag 2 through the inner connection portion 34 and the air guide tube 3, thereby realizing the expansion of the telescopic airbag 2, driving the front side plate 11 and the rear side plate 12 to move in opposite directions; when the air pressure in the telescopic airbag 2 increases, the sealing plate 43 moves downward, and when the sealing plate 43 moves to the exhaust section 422, the gas in the telescopic airbag 2 is discharged from the exhaust section 422, thereby reducing the constant air pressure in the telescopic airbag 2;

[0096] When the sealing plate 43 moves in the constant pressure section 423, the air pressure in the telescopic airbag 2 can increase or decrease, so that part of the gas can be stored in the telescopic airbag 2, so that the pressure in the telescopic airbag 2 exists within a constant air pressure range; rotating the screw can adjust the lifting and lowering of the pressure regulating component 44, change the initial position of the sealing plate 43, change the time when the sealing plate 43 leaves the constant pressure section 423, and change the constant air pressure range.

[0097] As a further solution of the present invention, a limiting sleeve 84 is fixedly disposed at the end of the outer connecting portion 35, and a limiting structure 8 is disposed between the limiting sleeve 84 and the valve body 41, and the limiting structure 8 can relatively fix the outer connecting portion 35 and the inner connecting portion 34; the limiting structure 8 includes:

[0098] The connecting ear 81 is fixedly arranged between the valve body 41;

[0099] The plug-in connector 82 is plugged into the limiting sleeve 84;

[0100] The limiting rod 83 is fixed to the connecting ear 81 and the plug-in connector 82 through a nut;

[0101] For details, see Figure 2 , insert the connector 82 into the limiting sleeve 84, and pass the limiting rod 83 through the connecting ear 81 and the connector 82, and fix the limiting rod 83, the connector 82 and the limiting sleeve 84 relatively by a nut, so that the outer connecting part 35 fixed to the limiting sleeve 84 is relatively fixed to the valve body 41, that is, the outer connecting part 35 is relatively fixed to the inner connecting part 34, so that the outer connecting part 35 is driven to move, and the inner connecting part 34 is synchronously moved;

[0102] When it is necessary to drive the rear side plate 12 to move alone, the limiting rod 83 is removed, and the limiting sleeve 84 is moved between the upper clamping plate 65 and the lower clamping plate 64. The limiting sleeve 84 spreads the upper clamping plate 65 and the lower clamping plate 64 apart, so that the driving plate 74 cannot rotate (the bottom of the sliding groove 75 in the free state contacts the cross bar 67). The sliding sleeve 72 moves back and forth, and the limiting sleeve 84 moves synchronously with it. The limiting sleeve 84 drives the rear side plate 12 to move alone through the external connection part 35.

[0103] As a further solution of the present invention, a speed regulator 9 is provided between the driving motor 68 and the reciprocating screw rod 71, and the speed regulator 9 can adjust the rotation speed of the reciprocating screw rod 71, and the speed regulator 9 includes:

[0104] The fixed cone wheel 91 is coaxially fixed with the reciprocating screw rod 71 and the output shaft of the driving motor 68;

[0105] The movable cone wheel 92 is slidably arranged coaxially with the reciprocating screw rod 71 and the output shaft of the driving motor 68 through a key;

[0106] The transmission belt 93 has two ends disposed between the fixed cone wheel 91 and the movable cone wheel 92;

[0107] The elastic member 94 is rotatably disposed between the drive motor 68 and the housing 61, and is used to push the movable cone wheel 92 coaxially slidably disposed with the output shaft of the drive motor 68 toward the fixed cone wheel 91, so as to facilitate the reset of the fixed cone wheel 91 and the movable cone wheel 92;

[0108] The trigger member 95 is slidably arranged with the housing 61 and can be pushed by the connecting ear 81 to make the movable cone wheel 92 slidably arranged coaxially with the reciprocating screw rod 71 approach the fixed cone wheel 91;

[0109] Specifically, Figure 7 and Fig. 9When the rear side plate 12 is driven alone to move into the pipeline, the connecting ear 81 is moved to contact with the trigger member 95. The friction between the outer connecting part 35 and the inner connecting part 34 will cause the inner connecting part 34 to move into the pipeline. The inner connecting part 34 drives the connecting ear 81 to move through the valve body 41. The connecting ear 81 squeezes and pushes the trigger member 95 to move. The trigger member 95 drives the movable cone wheel 92 coaxially slidingly arranged with the reciprocating screw rod 71 to approach the fixed cone wheel 91. The transmission belt 93 moves toward the side wall at the contact position with the fixed cone wheel 91 on one side of the reciprocating screw rod 71. Due to the limited length of the transmission belt 93, the contact position on the other side of the transmission belt 93 moves toward the inner wall of the fixed cone wheel 91. The radius of the driving side of the transmission belt 93 is reduced and the radius of the driven side is increased, thereby changing the transmission ratio, slowing down the movement speed of the sleeve 72, and slowing down the movement speed of the rear side plate 12 when it moves alone, thereby improving the accuracy of leakage point detection.

[0110] As a further solution of the present invention, the telescopic airbag 2 comprises:

[0111] The connecting rings 21 are distributed in a linear array, and the connecting rings 21 on both sides are fixed on the front side plate 11 and the rear side plate 12 respectively, and the side walls of the connecting rings 21 are fixed with bosses 22;

[0112] The telescopic parts 23 are distributed in a linear array and are alternately arranged between the connecting rings 21. Both ends of the telescopic parts 23 are provided with connecting parts 24.

[0113] The gland 25 is threadedly disposed on the connecting ring 21 and can connect the telescopic portion 23 to the connecting ring 21 through the connecting portion 24;

[0114] For details, see Figure 3 and Figure 4 , unscrew the pressure cover 25 from the connecting ring 21, and take out the connecting part 24 from the pressure cover 25, so that the telescopic part 23 can be separated from the connecting ring 21, which is convenient for targeted replacement and can reduce maintenance costs; in addition, the length of the detection part 1 can be adjusted by increasing or decreasing the number of telescopic parts 23 and connecting rings 21.

[0115] As a further solution of the present invention, the front side plate 11 and the rear side plate 12 both include a fixed portion and a movable portion, the fixed portion is fixed with a convex ring, and the convex ring is connected to the movable portion by a fastening bolt; this facilitates the replacement of the easily worn sealing airbag 13, and can reduce maintenance costs;

[0116] As a further solution of the present invention, a buckle 10 for limiting the movement of the connecting ear 81 is installed at the end of the shell 61; the buckle 10 can limit the valve body 41 through the connecting ear 81, thereby limiting the inner connecting part 34.

Claims

1. A geothermal pipeline detection device, comprising a detection unit (1), characterized in that: Both ends of the detection part (1) can be in contact with the pipe wall, and the detection part (1) comprises: A front side plate (11) and a rear side plate (12), wherein a groove is provided in the middle of each of the front side plate (11) and the rear side plate (12); A sealing airbag (13) is installed in the groove, and when the sealing airbag (13) is expanded, the outer end can expand and contract the groove and fit into the tube wall; The telescopic airbag (2) has two ends respectively connected to the front side plate (11) and the rear side plate (12), and is in communication with the sealing airbag (13); The air guide tube (3) has an end fixed to the front side plate (11), and an air inlet and outlet port (31) is provided at one end of a side wall of the air guide tube (3) close to the front side plate (11); the air guide tube (3) is connected to the telescopic air bag (2) via the air inlet and outlet port (31); An air intake check valve (33) is installed in the middle of the front side plate (11), so that air can enter the telescopic airbag (2) through the front side plate (11); A control valve (4) is installed at the outer end of the air guide tube (3) and is used to discharge the gas in the telescopic airbag (2) and is capable of maintaining a constant air pressure in the telescopic airbag (2); The gas flow meter (5) is installed at the outer end of the gas guide tube (3) and is used to measure the outflow of gas in the gas guide tube (3) per unit time.

2. A geothermal pipeline detection device according to claim 1, characterized in that: The air guide tube (3) and the rear side plate (12) are respectively connected to an inner connecting portion (34) and an outer connecting portion (35) via a quick connector, and the inner connecting portion (34) and the outer connecting portion (35) are relatively movable to change the spacing between the front side plate (11) and the rear side plate (12).

3. A geothermal pipeline detection device according to claim 2, characterized in that: It also includes a driving structure (6), wherein the driving structure (6) controls the movement of the rear side plate (12) outside the pipeline through an external connection portion (35); The driving structure (6) comprises: A housing (61), wherein a slider (62) is slidably disposed in the housing (61), and the slider (62) is fixedly provided with a lower clamping plate (64) via a connecting rod (63); An upper clamping plate (65) is slidably disposed between the slider (62) and the lower clamping plate (64) via a connecting rod (63), and a return spring (66) is disposed between the upper clamping plate and the slider (62); A reciprocating screw rod (71) is rotatably disposed in the housing (61) and is sleeved with a sliding sleeve (72) slidably disposed with the housing (61); a pin (73) is elastically disposed on a side wall of the sliding sleeve (72); and the pin (73) can cooperate with a screw groove of the reciprocating screw rod (71); A driving plate (74), wherein the top of the driving plate (74) is rotatably arranged on the bottom of the sliding sleeve (72), a sliding groove (75) is arranged in the middle of the driving plate (74), a cross bar (67) fixedly arranged with the sliding block (62) is slidably arranged in the sliding groove (75), and the bottom of the driving plate (74) can abut against the upper clamping plate (65); The driving motor (68) is used to drive the reciprocating screw rod (71) to rotate.

4. A geothermal pipeline detection device according to claim 3, characterized in that: The control valve (4) comprises: A valve body (41) is connected to the inner connecting portion (34); The diameter-reducing portion (42) is fixedly arranged in the valve body (41), with an air intake section (421) and an air exhaust section (422) on both sides, and a constant pressure section (423) arranged in the middle; A sealing plate (43) is slidably disposed in the diameter-changing portion (42) and is used to control the opening and closing of the inner connecting portion (34); A pressure regulating spring (45) is fixedly arranged between the pressure regulating member (44) and the sealing plate (43), and the pressure regulating member (44) is rotatably provided with a screw threadedly connected to the valve body (41).

5. A geothermal pipeline detection device according to claim 4, characterized in that: A limiting sleeve (84) is fixedly provided at the end of the outer connecting portion (35), and a limiting structure (8) is provided between the limiting sleeve (84) and the valve body (41), wherein the limiting structure (8) is capable of fixing the outer connecting portion (35) and the inner connecting portion (34) relative to each other; the limiting structure (8) comprises: A connecting ear (81) is fixedly mounted between the valve body (41); A plug-in connector (82) is plugged into the limiting sleeve (84); The limiting rod (83) is fixed to the connecting ear (81) and the plug-in connector (82) via a nut.

6. A geothermal pipeline detection device according to claim 3, characterized in that: A speed regulator (9) is provided between the driving motor (68) and the reciprocating screw rod (71), and the speed regulator (9) is capable of adjusting the rotation speed of the reciprocating screw rod (71). The speed regulator (9) comprises: A fixed cone wheel (91) is coaxially fixedly arranged with the reciprocating screw rod (71) and the output shaft of the driving motor (68); The movable cone wheel (92) is slidably arranged coaxially with the reciprocating screw (71) and the output shaft of the driving motor (68) through a key; A transmission belt (93), both ends of which are arranged between the fixed cone wheel (91) and the movable cone wheel (92); An elastic member (94) is rotatably disposed between the drive motor (68) and the housing (61) and is used to push a movable cone wheel (92) slidably disposed coaxially with an output shaft of the drive motor (68) toward the fixed cone wheel (91); The trigger member (95) is slidably arranged with the housing (61) and can be pushed by the connecting ear (81) to make the movable cone wheel (92) slidably arranged coaxially with the reciprocating screw rod (71) approach the fixed cone wheel (91).

7. A geothermal pipeline detection device according to claim 1, characterized in that: The telescopic airbag (2) comprises: The connecting rings (21) are distributed in a linear array, and the connecting rings (21) on both sides are respectively fixed on the front side plate (11) and the rear side plate (12), and the side walls of the connecting rings (21) are fixedly provided with bosses (22); The telescopic parts (23) are distributed in a linear array and are alternately arranged between the connecting rings (21), and both ends of the telescopic parts (23) are provided with connecting parts (24); The gland (25) is threadably disposed on the connecting ring (21) and is capable of connecting the telescopic portion (23) to the connecting ring (21) via a connecting portion (24).

8. The detection device for geothermal pipeline according to claim 1, characterized in that: The front side plate (11) and the rear side plate (12) both comprise a fixed portion and a movable portion, the fixed portion being fixed with a convex ring, and the convex ring and the movable portion being connected via a fastening bolt.

9. A geothermal pipeline detection device according to claim 5, characterized in that: A buckle (10) for limiting the movement of the connecting ear (81) is installed at the end of the housing (61).

Images