CN111442566B - Depth indication method and missing point detection method with same - Google Patents

Abstract

The invention relates to the technical field of central air conditioners, in particular to a depth indication method and a missing point detection method with the same, wherein the detection device comprises the following components: the device comprises an industrial personal computer, a detection head, a plugging sleeve, a sleeve extrusion device and a measuring head movement device, wherein the detection head is connected with the industrial personal computer through a vacuum tube, the lower end of the detection head is provided with the plugging sleeve, the sleeve extrusion device is sleeved in the middle of the detection head, and the upper end of the detection head is also sleeved with the measuring head movement device; the repair device includes: the expansion joint comprises an elastic sleeve, expansion rings and locking mechanisms, wherein the two ends of the elastic sleeve are respectively provided with one expansion ring, the two expansion rings are sleeved in the elastic sleeve, and the locking mechanisms are clamped on the two expansion rings; the method has the advantages that the segmented pressure maintaining experiment is carried out on the inside of the heat exchange pipe, so that the position of a leak point in the heat exchange pipe is found; the locking mechanism drives the two expansion rings to fix the elastic sleeve inside the heat exchange tube, so that the leakage point of the heat exchange tube is repaired.

Description

Depth indication method and missing point detection method with same

The application is a divisional application of the invention patent application 'a method for detecting leakage points of pipelines of a lithium bromide refrigerating unit'.

Application date of the original case: 2018-03-03.

Original application No.: 2018101767273.

the name of the original invention is: a method for detecting leakage points of pipelines of a lithium bromide refrigerating unit.

Technical Field

The invention relates to the technical field of central air conditioners, in particular to a depth indication method and a missing point detection method with the same.

Background

The central air conditioner is an air conditioner which controls different rooms by a host machine through a mode that hot and cold water pipes of wind and fire are connected with a plurality of tail ends so as to achieve the purpose of indoor air conditioning, the host machine has a plurality of cold accumulation modes, a lithium bromide refrigerating unit takes heat energy as power, and the advantages of small vibration, low noise and the like play an important role in the host machine market. A lithium bromide refrigerator is to use the absorption and release of lithium bromide solution to the water vapor under different temperatures to realize refrigeration, the circulation is to use the external heat source to realize refrigeration, the common heat source is steam, hot water, gas, fuel oil, etc, the lithium bromide refrigerator has many unique advantages, the development is very rapid in recent years, a plurality of heat exchange tubes are arranged in the condenser, evaporator and absorber of the lithium bromide refrigerator, in the actual use, the damage of the heat exchange tubes is often caused due to the quality of the heat exchange tubes, liquid impact or solution corrosion, etc., the leakage point is caused on the tube body, the refrigeration effect is reduced, the lithium bromide solution can be crystallized to block the pump body in serious cases, the current maintenance method is to inject nitrogen into the machine body, simultaneously one end of the heat exchange tube is blocked by a plug, and the other end of the heat exchange tube is coated with soapy water, form the soapy water film, judge the good or bad of heat exchange tube from the inflation state of soapy water film, pass through the stopper shutoff at the heat exchange tube both ends that damage, if the more liability of the heat exchange tube that damages needs whole change, the problem that exists now is, because the quantity of heat exchange tube is more, need detect the good or bad of several hundred heat exchange tubes usually, manual stopper shutoff and the naked eye observation of passing through, human error appears easily, lead to current detection method accuracy poor, can't judge the concrete position of leak source simultaneously, the heat exchange tube after the shutoff will lose the heat transfer function simultaneously, lead to the unit refrigeration efficiency to reduce, the cost of whole change heat exchange tube is huge.

Disclosure of Invention

The invention overcomes the defects of the prior art, provides a pipeline leakage point detection method of a lithium bromide refrigerating unit, and aims to solve the problems that the existing detection method of a central air-conditioning heat exchange tube is poor in accuracy and the refrigerating efficiency of the unit is reduced after plugging.

The technical scheme of the invention is as follows:

a central air conditioning heat exchange tube leak source detection device includes: the detection device comprises an industrial personal computer, a detection head, a plugging sleeve, a sleeve extrusion device and a measuring head movement device, wherein an axial through hole is formed in the detection head, the upper end of the through hole is connected with the industrial personal computer through a vacuum tube, a cup-shaped structure with the outer diameter gradually increased is arranged at the lower end of the detection head, the plugging sleeve is sleeved on the cup-shaped structure, the sleeve extrusion device is sleeved in the middle of the detection head, the lower end of the sleeve extrusion device is fixedly connected with the upper end of the plugging sleeve, and the upper end of the detection head is further sleeved with the measuring head movement device;

the bushing press device includes: thrust bearing, rotatory lantern ring, lantern ring drive ring, drive ring lead screw and driving motor, the thrust bearing activity cup joints on detecting the head, thrust bearing's lower terminal surface and shutoff sheathed tube up end fixed connection, thrust bearing's the outside is provided with the spacing ring, the one end of spacing ring and thrust bearing's one end fixed connection, and the other end of spacing ring is provided with the outer edge spacing to thrust bearing's other end axial, thrust bearing's upper end and rotatory lantern ring fixed connection, rotatory lantern ring cup joints on detecting the head, the inboard of rotatory lantern ring is passed through the screw and is connected with detecting the head, still be provided with a plurality of axial through-hole on the rotatory lantern ring, a plurality of axial through-hole is the circumference partition setting of annular on the rotatory lantern ring, the top of rotatory lantern ring is provided with the lantern ring drive ring, and the lantern ring cup joints on detecting the head through the bearing, the outside of lantern ring drive ring be provided with a plurality of with the polished rod that axial through-hole on the rotatory lantern ring corresponds The polished rod penetrates through the axial through hole, a circle of annular teeth are arranged on the outer wall of the upper end of the lantern ring driving ring, the annular teeth are meshed with two driving ring screw rods, the two driving ring screw rods are symmetrically arranged, the two driving ring screw rods are both connected with a driving motor through gears, and the driving motor is fixedly connected with the detection head;

the gauge head movement device includes: gauge head motion motor, bearing, articulated arm and motion wheel, bearing among the gauge head motion device cup joints on the gauge head, is provided with round annular tooth on the outer lane of this bearing, and this annular tooth passes through the gear and is connected with two gauge head motion motors, and two gauge head motion motor symmetries set up, and two gauge head motion motors all with detect first fixed connection, it has a plurality of articulated arm still to articulate on the outer lane of the bearing among the gauge head motion device, and a plurality of articulated arm is the circumference setting of annular partition, the one end of articulated arm is passed through the spring and is connected with the outer lane of this bearing, and the other end of articulated arm stretches out outwards, the articulated arm is provided with the motion wheel to one of stretching out to the outside, and the slope of motion wheel sets up.

Further, the industrial computer includes: the vacuum pump is connected with the vacuum pipe, the pressure gauge is arranged on the vacuum pipe, and the valve is arranged on the vacuum pipe between the pressure gauge and the vacuum pump.

Furthermore, a shell is arranged on the outer side of the detection head, and the plugging sleeve, the sleeve extruding device and the measuring head moving device are all arranged in the shell.

A method for detecting a leakage point of a pipeline of a lithium bromide refrigerating unit comprises the following steps:

step a: the two ends of the heat exchange tube are respectively inserted with a leak point detection device, a driving ring screw rod is driven to rotate by a driving motor in the leak point detection device, the driving ring screw rod pushes a lantern ring driving ring to rotate, the lantern ring driving ring drives a rotating lantern ring to rotate through a polished rod at the lower end, the rotating lantern ring moves downwards through a thread on the detection head, the rotating lantern ring pushes a thrust bearing to move downwards, the thrust bearing downwards extrudes a plugging sleeve, and the lower end of the plugging sleeve is expanded under the expansion of a cup-shaped structure at the lower end of the detection head to plug the two ends of the heat exchange tube;

step b: opening an industrial personal computer, pumping the tube into a negative pressure state by the industrial personal computer through the vacuum tube and an axial through hole in the detection head, maintaining pressure, and judging whether a leakage point exists on the heat exchange tube or not through the pressure maintaining;

step c: for a heat exchange tube with a leakage point, the length of the heat exchange tube is measured by a ruler outside the heat exchanger, one end of the heat exchange tube is continuously blocked by a leakage point detection device, the leakage point detection device at the other end of the heat exchange tube reverses a driving motor, a measuring head movement motor is started after a blocking sleeve is withdrawn, the measuring head movement motor drives the outer ring of a bearing to rotate through a gear, the outer ring of the bearing drives a plurality of articulated arms to rotate, the articulated arms drive a movement wheel to roll along the inner wall of the heat exchange tube to push the leakage point detection device to advance, vacuum pressure maintaining is carried out again after the movement of one end is carried out for a distance, the movement and pressure maintaining operations are repeated until the leakage point detection device crosses the leakage point position, the movement distance of the leakage point detection device is subtracted by the length of the heat exchange tube, and the distance from the leakage point to one end of the heat exchange tube is obtained;

step d: and d, repeating the operation in the step c on the other side of the heat exchange tube to obtain the distance between the leakage point and the other end of the heat exchange tube, further obtaining the position of the leakage point in the heat exchange tube and repairing the leakage point.

Further, the advancing distance of the leak detection device in the step c is 5-10 cm.

Further, the first advance distance of the leak detection device in the step c is one third of the length of the heat exchange tube, and the subsequent advance distance is one sixth of the length of the heat exchange tube.

Further, the vacuum pump on the industrial personal computer is firstly opened in the vacuum pressure maintaining operation, then the valve is opened, a pressure value smaller than the local standard atmospheric pressure is calibrated on the dial plate of the pressure gauge, after the pointer of the pressure gauge reaches the calibrated pressure value, the valve on the industrial personal computer is closed, then the vacuum pump is closed, and pressure maintaining is carried out.

A pipeline repairing device for a central air conditioner comprises: the expansion joint comprises an elastic sleeve, expansion rings and locking mechanisms, wherein the two ends of the elastic sleeve are respectively provided with one expansion ring, the two expansion rings are sleeved in the elastic sleeve, and the locking mechanisms are clamped on the two expansion rings;

the expansion ring is a C-shaped snap ring with an opening, two ends of the opening of the C-shaped snap ring are provided with overlapping parts, the overlapping parts are axially overlapped, the inner sides of two ends of the opening of the expansion ring are respectively provided with a hinge seat, each hinge seat is hinged with a sleeve, the two sleeves are respectively sleeved at two ends of a positive and negative screw rod, internal threads matched with threads at two ends of the positive and negative screw rod are respectively arranged inside the two sleeves, and a screw rod gear is arranged in the middle of the positive and negative screw rod;

the locking mechanism includes: the device comprises a rod body, gear seats, locking motors, synchronous belts, a lifting motor and a clamping plate, wherein the rod body passes through the upper parts of positive and negative screw rods at the centers of two expansion rings, the rod body is sleeved with the two gear seats, the two gear seats are respectively provided with a positioning bolt, the positioning bolt passes through a through hole on the side surface of the gear seat and is connected with the gear seats through threads, the two gear seats are respectively provided with a locking gear, the two locking gears are respectively meshed with a screw rod gear, the rotating shafts of the two locking gears are respectively and fixedly connected with a belt roller, the two belt rollers are connected through the synchronous belts, the side surface of one locking gear is provided with the locking motor, the rotating shaft of the locking motor is connected with the rotating shaft of the locking gear, the locking motor is fixedly connected with the gear seats through a connecting rod, the clamping plate passes through the lower parts of the positive and negative screw rods at the centers of the two expansion rings, the one end of clamp plate is provided with two clamp arms, and two clamp arms are located the both ends of positive and negative tooth lead screw respectively and contact with the sleeve pipe, and the other end of clamp plate is provided with the slider, the slider passes through the unsettled top that sets up at the clamp plate of link, a lead screw has been cup jointed in the slider, the upper end of lead screw and the axis of rotation fixed connection who promotes the motor, promotion motor and body of rod fixed connection.

Furthermore, a tensioning wheel is further arranged on the gear seat and fixedly connected with the gear seat through a connecting rod.

Furthermore, a plurality of fixed sleeves are arranged between the rod body and the clamping plate.

A pipe replacement-free air conditioner pipeline repairing method comprises the following steps:

step a: cutting a section of elastic sleeve with the length larger than the leakage point, respectively embedding two expansion rings into two ends of the elastic sleeve, respectively rotating two lead screw gears, driving a positive and negative screw rod to rotate through the lead screw gears, and pushing the sleeves on two sides to move outwards through the positive and negative screw rod so that the two expansion rings support the two ends of the elastic sleeve;

step b: adjusting the distance between two gear seats on the locking mechanism to adapt to the positions of two expansion rings, screwing a positioning bolt on the gear seat to lock the gear seat, inserting the locking mechanism into an elastic sleeve, driving a clamping plate to move upwards by starting a lifting motor, enabling locking gears on the two gear seats to be respectively meshed with two lead screw gears, and simultaneously enabling two clamping arms on the clamping plate to be clamped from the lower end of the sleeve;

step c: the locking mechanism is sent into the heat exchange tube, so that the elastic sleeve at the front end of the locking mechanism completely covers the leakage point, and the two expansion rings are respectively positioned at two sides of the leakage point;

step d: starting a locking motor, enabling the locking motor to enable two locking gears to synchronously rotate through a synchronous belt to drive two lead screw gears to rotate, enabling the lead screw gears to drive positive and negative lead screws to rotate, pushing the sleeves on two sides to move outwards through the positive and negative lead screws, enabling two expansion rings to support two ends of the elastic sleeve until the two expansion rings fixedly press the elastic sleeve on the inner wall of the heat exchange tube, closing the locking motor, starting a lifting motor to reversely rotate, and dropping a clamping plate;

step e: and taking out the locking mechanism to finish the repair of the leakage point of the heat exchange tube.

Further, the length of the elastic sleeve taken in the step a is at least 2 times of the width of the leak point.

Furthermore, in the step e, the clamping plate is dropped to the bottom of the expansion ring, and the locking mechanism is lifted, so that the locking gears on the two gear seats are respectively disengaged from the two screw rod gears.

The invention has the beneficial effects that:

1) the invention relates to a central air-conditioning heat exchange tube leak source detection device.A detection head is internally provided with an axial through hole, the upper end of the through hole is connected with an industrial personal computer through a vacuum tube, the lower end of the detection head is provided with a cup-shaped structure with gradually increased outer diameter, a plugging sleeve is sleeved on the cup-shaped structure, a sleeve extrusion device is sleeved in the middle of the detection head, the lower end of the sleeve extrusion device is fixedly connected with the upper end of the plugging sleeve, and the upper end of the detection head is also sleeved with a measuring head movement device; the structure can realize that the detection head is delivered to the inside of the heat exchange tube through the measuring head movement mechanism, the plugging sleeve is extruded through the sleeve extrusion device to plug one section of the inside of the heat exchange tube, the pressure maintaining experiment is carried out through the industrial personal computer, and then the segmented pressure maintaining experiment is carried out on the inside of the heat exchange tube, so that the position of a leak point in the heat exchange tube is found out.

2) The detection device has the functions of plugging and vacuum pressure maintaining, can realize the pressure maintaining experiment by respectively inserting the detection devices at the two ends of the heat exchange tube, does not need a plug to plug one end of the heat exchange tube compared with the existing detection mode, saves labor, does not need a mode of observing soap bubbles by naked eyes to judge the state of the tube body, and has the characteristic of more accurate detection.

3) According to the pipeline repairing device for the central air conditioner, the two ends of the elastic sleeve are respectively provided with the expansion ring, the two expansion rings are sleeved inside the elastic sleeve, the locking mechanism is clamped on the two expansion rings, the locking mechanism can be used for conveying the locking mechanism into the heat exchange pipe, the locking mechanism carries the elastic sleeve to move to a leakage point, the locking mechanism drives the two expansion rings to fix the elastic sleeve inside the heat exchange pipe, and the repairing of the leakage point of the heat exchange pipe is realized.

4) The repairing device can repair the leakage point of the heat exchange pipe, the heat exchange pipe still has the heat exchange function after being repaired, compared with the existing repairing mode, the heat exchange pipe still can pass the heat exchange fluid after being repaired, the refrigerating efficiency of a unit cannot be influenced, meanwhile, the whole replacement of the heat exchange pipe can be avoided when the heat exchange pipe is damaged more, the labor and the maintenance cost are saved, and the service life of the heat exchange pipe is prolonged.

Drawings

FIG. 1 is a schematic view of the overall structure of a central air conditioning heat exchange tube leak detection device;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is a schematic view showing a leak point detection device for a heat exchange tube of a central air conditioner in use;

FIG. 4 is a schematic structural diagram of a fourth embodiment of the present invention;

FIG. 5 is a schematic structural diagram of fifth and sixth embodiments of the present invention;

FIG. 6 is a schematic view of the overall structure of a pipeline repairing device for a central air conditioner;

FIG. 7 is a side view of FIG. 6;

FIG. 8 is a top view of FIG. 6;

FIG. 9 is a schematic structural view of the expansion loop of FIG. 6;

FIG. 10 is a schematic structural diagram of a fourteenth embodiment of the invention;

FIG. 11 is a schematic diagram of a fifteenth embodiment of the present invention;

FIG. 12 is a schematic diagram of a sixteenth embodiment of the present invention;

in the figure: 1-an industrial personal computer; 2-a detection head; 3-plugging the sleeve; 4-a sleeve extrusion device; 5-a measuring head movement device; 6-depth gauge; 7-an elastic sleeve; 8-an expansion ring; 9-a locking mechanism; 21-a housing; 22-an auxiliary wheel; 23-a through hole; 41-a thrust bearing; 42-a rotating collar; 43-collar drive ring; 44-driving ring screw rod; 45-driving the motor; 51-a probe movement motor; 52-a bearing; 53-an articulated arm; 54-a running wheel; 61-reel; 62-a volute spring; 63-a reel stand; 64-a telescopic rod; 65-fixed pins; 66-depth cord; 81-a hinged seat; 82-a sleeve; 83-positive and negative teeth screw rod; 84-screw gear; 91-a rod body; 92-gear seat; 93-locking the motor; 94-synchronous belt; 95-a hoisting motor; 96-a clamping plate; 98-repair auxiliary wheel; 99-repairing the depth gauge; 221-a rotator wheel; 222-a hinged lever; 223-a limiting block; 241-a first hinge lever; 242-a second hinge lever; 243-anti-slip head; 411-a stop collar; 431-a polish rod; 921-tensioning wheel; 961-a slider; 962-fixing the cannula; 971-repair of the motion motor; 972-repairing the bearing; 973-repair of articulated arms; 974-repair of the running wheels; 981-repair rotating wheel; 982-repairing hinged rods; 983-repairing the limiting block; 984-repairing the return spring; 991-repairing the reel; 992-repairing volute spiral spring; 993-repairing the reel stand; 994-repairing the telescopic rod; 995-repairing the fixing pin; 996-repair depth rope.

Detailed Description

The invention will be described in detail below with reference to the following drawings:

detailed description of the invention

Referring to fig. 1 and fig. 2, the device for detecting a leakage point of a heat exchange tube of a central air conditioner disclosed in this embodiment includes: the detection device comprises an industrial personal computer 1, a detection head 2, a plugging sleeve 3, a sleeve extruding device 4 and a measuring head movement device 5, wherein an axial through hole is formed in the detection head 2, the upper end of the through hole is connected with the industrial personal computer 1 through a vacuum tube, a cup-shaped structure with the outer diameter gradually increasing is arranged at the lower end of the detection head 2, the plugging sleeve 3 is sleeved on the cup-shaped structure, the sleeve extruding device 4 is sleeved in the middle of the detection head 2, the lower end of the sleeve extruding device 4 is fixedly connected with the upper end of the plugging sleeve 3, and the measuring head movement device 5 is further sleeved at the upper end of the detection head 2; the plugging sleeve 3 is extruded by the sleeve extruding device 4, the lower end of the plugging sleeve 3 slides on the surface of the cup-shaped structure of the detection head 2, the end part of the plugging sleeve 3 is opened, a gap between the detection head 2 and the heat exchange tube is plugged, the industrial personal computer 1 vacuumizes the closed area at the front end of the detection head 2 through the axial through hole in the detection head 2 and carries out pressure maintaining, and the quality of the heat exchange tube is judged according to the pressure maintaining condition.

The casing extruding device 4 comprises: the detection device comprises a thrust bearing 41, a rotating lantern ring 42, a lantern ring driving ring 43, a driving ring screw rod 44 and a driving motor 45, wherein the thrust bearing 41 is movably sleeved on a detection head 2, the lower end face of the thrust bearing 41 is fixedly connected with the upper end face of a plugging sleeve 3, a limiting ring 411 is arranged on the outer side of the thrust bearing 41, one end of the limiting ring 411 is fixedly connected with one end of the thrust bearing 41, the other end of the limiting ring 411 is provided with an outer edge for axially limiting the other end of the thrust bearing 41, the upper end of the thrust bearing 41 is fixedly connected with the rotating lantern ring 42, the rotating lantern ring 42 is sleeved on the detection head 2, the inner side of the rotating lantern ring 42 is connected with the detection head 2 through threads, the rotating lantern ring 42 is further provided with a plurality of axial through holes which are arranged on the rotating lantern ring 42 in an annular equal-dividing circumference, and a lantern ring driving ring 43 is arranged above the rotating lantern ring 42, the lantern ring driving ring 43 is sleeved on the detection head 2 through a bearing, a plurality of polished rods 431 corresponding to axial through holes in the rotating lantern ring 42 are arranged on the outer side of the lantern ring driving ring 43, the polished rods 431 penetrate through the axial through holes, a circle of annular teeth are arranged on the outer wall of the upper end of the lantern ring driving ring 43, the annular teeth are meshed with two driving ring lead screws 44, the two driving ring lead screws 44 are symmetrically arranged, the two driving ring lead screws 44 are both connected with a driving motor 45 through gears, and the driving motor 45 is fixedly connected with the detection head 2;

the stylus moving device 5 includes: the measuring head movement device comprises a measuring head movement motor 51, a bearing 52, a hinged arm 53 and a movement wheel 54, wherein the bearing 52 in the measuring head movement device 5 is sleeved on a detection head 2, the outer ring of the bearing 52 is provided with a circle of annular teeth, the annular teeth are connected with two measuring head movement motors 51 through gears, the two measuring head movement motors 51 are symmetrically arranged, the two measuring head movement motors 51 are fixedly connected with the detection head 2, the outer ring of the bearing 52 in the measuring head movement device 5 is also hinged with a plurality of hinged arms 53, the hinged arms 53 are arranged in an annular equally-divided circle, one end of each hinged arm 53 is connected with the outer ring of the bearing 52 through a spring, the other end of each hinged arm 53 extends outwards, one end of each hinged arm 53 extending outwards is provided with the movement wheel 54, and the movement wheel 54 is obliquely arranged;

the detection head 2 is sent into the heat exchange tube through the measuring head movement device 5, the heat exchange tube is subjected to segmented detection, the depth of the detection head 2 in the heat exchange tube is obtained according to the extending length of the vacuum tube connected to the detection head 2, and the specific position of a leakage point is determined.

Detailed description of the invention

The embodiment is based on the first specific implementation mode, and the difference is that the industrial personal computer 1 includes: the vacuum pump is connected with the vacuum pipe, the pressure gauge is arranged on the vacuum pipe, and the valve is arranged on the vacuum pipe between the pressure gauge and the vacuum pump; and closing the valve to maintain the pressure after the vacuum pump forms a negative pressure environment, and observing the pressure change through the pressure gauge to realize a vacuum pressure maintaining experiment.

Detailed description of the invention

In this embodiment, on the basis of the first embodiment, the difference is that a housing 21 is further disposed outside the detection head 2, and the plugging sleeve 3, the sleeve extruding device 4 and the probe moving device 5 are all disposed in the housing 21; the internal components are protected by the housing to prevent damage to the device during use.

Detailed description of the invention

With reference to fig. 4, the present embodiment is based on the first specific embodiment, and is different in that the graphite heat exchanger leak source detection apparatus further includes a depth gauge 6, where the depth gauge 6 includes: the detector comprises a scroll 61, a scroll spring 62, a scroll frame 63, an expansion link 64, a fixing pin 65 and a depth rope 66, wherein the depth rope 66 is provided with depth identification scales, one end of the depth rope 66 is connected with the detection head 2, the other end of the depth rope 66 is wound on the scroll 61, two ends of the scroll 61 are rotatably connected with the rotating shaft frame 63, the scroll spring 62 is arranged between the scroll 61 and the rotating shaft frame 63, the scroll frame 63 is fixedly connected with one end of the expansion link 64, the other end of the expansion link 64 is hinged with one end of the fixing pin 65, and the fixing pin 65 is inserted into an adjacent heat exchange pipe;

for the heat exchange tube with the leakage point, the length of the heat exchange tube is measured by a ruler outside the heat exchanger, one end of the heat exchange tube is continuously plugged by a leakage point detection device, before the leakage point detection device at the other end of the heat exchange tube is inserted into the heat exchange tube, a depth rope 66 is connected with the leakage point detection device, a fixed pin 65 on a depth ruler 6 is inserted into an adjacent heat exchange tube for fixing, a telescopic rod 64 is pulled to adjust the position of a scroll, the depth rope 66 is made to be parallel to the axis of the heat exchange tube, the leakage point detection device advances to pull the depth rope 66 to drive the scroll 61 to rotate, and meanwhile, a volute spring 62 straightens the depth rope 66.

Detailed description of the invention

With reference to fig. 5, the present embodiment is based on the first specific embodiment, and the difference is that a plurality of auxiliary wheels 22 are further disposed on an outer wall of a lower end of the leak source detecting device, the plurality of auxiliary wheels 22 are circumferentially disposed on an outer wall of the housing 21 in an annular shape, and the auxiliary wheels 22 include: the heat exchanger comprises a rotating wheel 221, a hinged rod 222, a limiting block 223 and a return spring 224, wherein the hinged rod 222 is hinged on the shell 21, one end of the hinged rod 222 is connected with the shell 21 through the spring, the other end of the hinged rod 222 extends outwards, the rotating wheel 221 is arranged at the end, extending outwards, of the hinged rod 222, the rotating direction of the rotating wheel 221 is along the axial direction of the heat exchange tube, the limiting block 223 is arranged on the outer side of the hinged rod 222, and the limiting block 223 is fixedly connected with the shell 21.

When the leak point detection device moves, the auxiliary wheels 22 lift the detection head 2 to ensure that the axis of the detection head 2 is parallel to the axis of the heat exchange tube, so that the detection head 2 is prevented from colliding with the inner wall of the heat exchange tube in the movement, when the lower end of the plugging sleeve 3 is unfolded to plug the two ends of the heat exchange tube, the return spring 224 at one end of the hinge rod 222 pulls one end of the hinge rod 222 towards the device, the other end of the hinge rod 222 moves towards the inner wall of the heat exchange tube, the rotating wheel 221 is tightly attached to the inner wall of the heat exchange tube, so that the lower end of the detection head is lifted, the auxiliary wheels 22 are arranged on the annular equal-dividing circumference at the lower end of the detection head to enable the axis of the detection head 2 to coincide with the axis of the heat exchange tube, the opened plugging surface at the lower end of the plugging sleeve 3 is perpendicular to the axis of the heat exchange tube, and the sealing performance of plugging sleeve 3 plugging is ensured.

Detailed description of the invention

With reference to fig. 5, the difference between the first embodiment of the present invention is that a housing is disposed on the leak point detecting device, a plurality of through holes 23 are disposed on the housing, the through holes 23 are axial long holes, the plurality of through holes 23 are circumferentially disposed on the housing in an annular shape, and an anti-skid device 24 is disposed in each through hole 23, and each anti-skid device 24 includes: the anti-slip device comprises a first hinge rod 241, a second hinge rod 242 and an anti-slip head 243, wherein one end of the first hinge rod 241 is hinged to the thrust bearing 41, the other end of the first hinge rod 241 is connected to the anti-slip head 243, the anti-slip head 243 is of a spherical structure, one end of the second hinge rod 242 is hinged to the inner wall of the shell, and the other end of the second hinge rod 242 is hinged to the middle of the first hinge rod 241;

when leak source detection device carries out the shutoff, thrust bearing 41 downstream, the one end downstream of driving first articulated rod 241, it rotates to make first articulated rod 241 take place through second articulated rod 242, the other end of first articulated rod 241 passes behind through-hole 23, make the inner wall contact of anti-skidding head 243 and heat exchange tube, set up a plurality of antiskid 24 through the axial, form a plurality of anti-skidding points between leak source detection device and heat exchange tube inner wall, be used for offsetting the effect of atmospheric pressure when carrying out the vacuum pressurize, prevent to make device itself take place to rock by atmospheric pressure effect when carrying out the pressurize, lead to the leakproofness poor.

Detailed description of the invention

Referring to fig. 1, 2 and 3, a method for detecting a leak point of a pipeline of a lithium bromide refrigeration unit disclosed in this embodiment is implemented on a device for detecting a leak point of a heat exchange tube of a central air conditioner according to the first, second, third, fourth, fifth or sixth embodiment, and includes the following steps:

step a: injecting protective gas into the lithium bromide unit until the pressure inside the unit is the same as the atmospheric pressure, opening flanges at two ends of the heat exchange tube, and washing and drying the heat exchange tube; preventing air from entering the corrosion unit;

step b: a leak point detection device is respectively inserted into two ends of the heat exchange tube, a driving ring screw rod 44 is driven to rotate by a driving motor 45 in the leak point detection device, the driving ring screw rod 44 pushes a lantern ring driving ring 43 to rotate, the lantern ring driving ring 43 drives a rotary lantern ring 42 to rotate through a polished rod 431 at the lower end, the rotary lantern ring 42 moves downwards through threads on the detection head 2, the rotary lantern ring 42 pushes a thrust bearing 41 to move downwards, the thrust bearing 41 downwards extrudes the plugging sleeve 3, and the lower end of the plugging sleeve 3 is expanded under the expansion of a cup-shaped structure at the lower end of the detection head 2 to plug two ends of the heat exchange tube;

step c: opening the industrial personal computer 1, pumping the vacuum tube into a negative pressure state through the vacuum tube and an axial through hole in the detection head 2 by the industrial personal computer 1, maintaining pressure, and judging whether a leakage point exists on the heat exchange tube or not through the pressure maintaining; the judgment result is more accurate;

step d: for a heat exchange tube with a leakage point, the length of the heat exchange tube is measured by a ruler outside the heat exchanger, one end of the heat exchange tube is continuously blocked by a leakage point detection device, the leakage point detection device at the other end of the heat exchange tube enables a driving motor 45 to rotate reversely, a detection head movement motor 51 is started after a blocking sleeve 3 is withdrawn, the detection head movement motor 51 drives the outer ring of a bearing 52 to rotate through a gear, the outer ring of the bearing 52 drives a plurality of hinged arms 53 to rotate, the hinged arms 53 drive a movement wheel 54 to roll along the inner wall of the heat exchange tube, the leakage point detection device is pushed to advance, vacuum pressure maintaining is carried out again after the distance of one end of the leakage point detection device advances, the advancing and pressure maintaining operations are repeated until the leakage point detection device passes through the position of the leakage point, the advancing distance of the leakage point detection device is subtracted by the length of the heat exchange tube, and the distance of the leakage point from one end of the heat exchange tube is obtained;

step e: and d, repeating the operation in the step c on the other side of the heat exchange tube to obtain the distance between the leakage point and the other end of the heat exchange tube, further obtaining the position of the leakage point in the heat exchange tube and repairing the leakage point.

Detailed description of the invention

On the basis of the seventh specific implementation mode, the difference in this embodiment is that the advancing distance of the leak point detection device in step d is 5-10cm, the length of the heat exchange tube is generally about five meters, and the leak point position can be found more accurately by selecting a smaller advancing distance.

Detailed description of the invention

In this embodiment, on the basis of the seventh specific implementation manner, the difference is that the first advance distance of the leak detection device in step d is one third of the length of the heat exchange tube, and the subsequent advance distance is one sixth of the length of the heat exchange tube; the leakage points of the heat exchange tube are mostly arranged in the middle, the heat exchange tube is divided into three parts, the first one third of the leakage points advance, and then the leakage point position can be found more quickly by advancing one sixth each time.

Detailed description of the preferred embodiment

In this embodiment, on the basis of the seventh specific implementation mode, the vacuum pump on the industrial personal computer is first turned on, then the valve is turned on, a pressure value smaller than the local standard atmospheric pressure is calibrated on the dial plate of the pressure gauge, after the pointer of the pressure gauge reaches the calibrated pressure value, the valve on the industrial personal computer is turned off, then the vacuum pump is turned off, and pressure maintaining is performed.

Detailed description of the invention

Referring to fig. 6, 7, 8 and 9, the pipe repairing device for a central air conditioner disclosed in this embodiment is used in combination with a central air conditioner heat exchange pipe leakage point detecting device according to the first, second, third, fourth, fifth or sixth embodiment, and includes: the expansion joint comprises an elastic sleeve 7, expansion rings 8 and locking mechanisms 9, wherein the two ends of the elastic sleeve 7 are respectively provided with one expansion ring 8, the two expansion rings 8 are sleeved in the elastic sleeve 7, and the locking mechanisms 9 are clamped on the two expansion rings 8; the locking mechanism is conveyed into the heat exchange tube through the long rod piece, the locking mechanism carries the elastic sleeve to move to a leakage point, and the locking mechanism drives the two expansion rings to fix the elastic sleeve in the heat exchange tube, so that the leakage point of the heat exchange tube is repaired;

the expansion ring 8 is a C-shaped clamp ring with an opening, two ends of the opening of the C-shaped clamp ring are provided with overlapping parts, the overlapping parts are axially overlapped, the inner sides of two ends of the opening of the expansion ring 8 are respectively provided with a hinge seat 81, each hinge seat 81 is hinged with a sleeve 82, the two sleeves 82 are respectively sleeved at two ends of a positive and negative screw rod 83, inner threads matched with the threads at two ends of the positive and negative screw rod 83 are respectively arranged inside the two sleeves 82, and a screw rod gear 84 is arranged in the middle of the positive and negative screw rod 83; the axial overlapped part of the C-shaped snap ring still keeps the circumferential contact surface with the elastic sleeve 7 without a gap after the C-shaped snap ring expands, the two sleeves 82 are pushed by the positive and negative teeth lead screws 83 to expand the expansion ring 8 into an approximate circle, and the circular radial run-out is compensated by the elastic deformation of the elastic sleeve 7, so that the sealing property is ensured;

the locking mechanism 9 includes: the device comprises a rod body 91, gear seats 92, a locking motor 93, a synchronous belt 94, a lifting motor 95 and a clamping plate 96, wherein the rod body 91 penetrates through the centers of two expansion rings 8 from the upper part of a positive and negative screw rod 83, the rod body 91 is sleeved with the two gear seats 92, the two gear seats 92 are respectively provided with a positioning bolt, the positioning bolt penetrates through a through hole in the side surface of the gear seat 92 and is connected with the gear seats 92 through threads, the two gear seats 92 are respectively provided with a locking gear, the two locking gears are respectively meshed with the screw rod gear 84, the rotating shafts of the two locking gears are respectively and fixedly connected with a belt roller, the two belt rollers are connected through the synchronous belt 94, the side surface of one of the locking gears is provided with the locking motor 93, the rotating shaft of the locking motor 93 is connected with the rotating shaft of the locking gear, and the locking motor 93 is fixedly connected with the gear seats 92 through a connecting rod, the clamping plate 96 penetrates through the lower portion of the positive and negative tooth lead screw 83 in the center of the two expansion rings 8, two clamping arms are arranged at one end of the clamping plate 96, the two clamping arms are respectively located at two ends of the positive and negative tooth lead screw 83 and are in contact with the sleeve 82, a sliding block 961 is arranged at the other end of the clamping plate 96, the sliding block 961 is arranged above the clamping plate 96 in a hanging mode through a connecting frame, a lead screw is sleeved in the sliding block 961, the upper end of the lead screw is fixedly connected with a rotating shaft of the lifting motor 95, and the lifting motor 95 is fixedly connected with the rod body 91.

Detailed description of the invention

In this embodiment, in addition to the eleventh embodiment, a tension pulley 921 is further provided on the gear holder 92, and the tension pulley 921 is fixedly connected to the gear holder 92 by a connecting rod.

Detailed description of the invention

The present embodiment is based on the eleventh embodiment, and the difference is that a plurality of fixing sleeves 962 are disposed between the rod 91 and the clamping plate 96, and the extension and retraction of the fixing sleeves 962 ensure that the rod 91 and the clamping plate 96 are kept parallel in motion, and simultaneously ensure that the clamping force between the gears on the two gear bases 92 and the two lead screw gears is the same, ensure that the two lead screw gears are locked synchronously, and ensure that the sealing performance at the two ends of the elastic sleeve 7 is the same.

Detailed description of the invention fourteen

With reference to fig. 10, the difference between the first embodiment and the second embodiment is that the rod body is further provided with a repairing exercise device, which includes: repair motion motor 971, repair bearing 972, repair articulated arm 973 and repair motion wheel 974, repair bearing 972 cup joints on body of rod 91, is provided with round annular tooth on repairing the outer lane of bearing 972, and the annular tooth passes through the gear and is connected with two repair motion motors 971, and two repair motion motor 971 symmetries set up, and two repair motion motor 971 all with body of rod 91 fixed connection, it has a plurality of repair articulated arm 973 still to articulate on the outer lane of bearing 972, and a plurality of repair articulated arm 973 is the circumference setting of annular partition, the one end of repairing articulated arm 973 is connected through spring and the outer lane of repairing bearing 972, and the other end of repairing articulated arm 973 outwards stretches out, repair articulated arm 973 and to be provided with on the one end that stretches out to the outside and repair motion wheel 974, repair motion wheel 974 slope setting.

After sending locking mechanism 9 into the heat exchange tube, start to repair motion motor 971, repair the outer lane rotation that motion motor 971 repaired bearing 972 through the gear drive, the outer lane of repairing bearing 972 drives a plurality of and repairs articulated arm 973 and rotates, repair articulated arm 973 and drive and repair the inner wall roll of motion wheel 974 along the heat exchange tube, roll along the helix at the heat exchange tube inner wall through repairing motion wheel 974, promote locking mechanism 9 forward motion, and the position of locking mechanism 9 is judged to the degree of depth of sending into through the body of rod 91.

Detailed description of the invention

With reference to fig. 11, the present embodiment is based on the eleventh embodiment, and the difference is that a plurality of groups of repair auxiliary wheel sets are circumferentially arranged at equal intervals on the outer circumference of one end of the rod body 91, each group of repair auxiliary wheel sets includes two repair auxiliary wheels 98 arranged oppositely, and each repair auxiliary wheel 98 includes: the repairing hinge rod 982 is connected with the rod body 91 through the repairing return spring 984, the other end of the repairing hinge rod 982 extends outwards, the repairing hinge rod 982 is provided with a repairing rotating wheel 981 at the end extending outwards, the rotating direction of the repairing rotating wheel 981 is arranged along the axial direction of the heat exchange tube, the repairing hinge rod 982 is provided with a repairing limiting block 983 at the outer side, and the repairing limiting block 983 is fixedly connected with the rod body 91;

after the locking mechanism 9 is sent into the heat exchange tube, the repairing hinged rod 982 is pulled to rotate by the repairing return spring 984 between the repairing auxiliary wheel 98 and the rod body 91, so that the repairing rotating wheel 981 at the far end of the repairing hinged rod 982 is attached to the inner wall of the heat exchange tube to provide support for the locking mechanism 9, a plurality of groups of repairing auxiliary wheel groups are circumferentially arranged on the outer side of one end of the rod body 91, the locking mechanism 9 is lifted to enable the elastic sleeve 7 to be separated from the heat exchange tube, and meanwhile, the axis of the elastic sleeve 7 at the front end of the locking mechanism 9 is ensured to be parallel to the axis of the heat exchange tube; the phenomenon that the elastic sleeve 7 and the inner wall of the annular heat pipe are rubbed to cause falling off in the process of feeding the locking mechanism 9 into the heat exchange pipe is avoided, meanwhile, the elastic sleeve 7 and the heat exchange pipe are arranged in parallel, the side face of the expansion ring 8 is perpendicular to the axis of the heat exchange pipe, and sealing performance is guaranteed during plugging.

Detailed description of the invention

Referring to fig. 12, this embodiment is based on the eleventh embodiment, and the difference is that the central air-conditioning heat exchange tube leakage point repairing device further includes a repairing depth gauge 99, where the repairing depth gauge 99 includes: repair spool 991, repair volute spring 992, repair spool frame 993, repair telescopic link 994, repair fixed pin 995 and repair depth rope 996, be provided with the degree of depth sign scale on repairing depth rope 996, repair depth rope 996's one end and body of rod 91 are connected, repair depth rope 996's other end winding on repairing spool 991, repair spool 991's both ends with repair spool frame 993 and rotate and be connected, it is provided with between spool 991 and the repair spool frame 993 and repairs volute spring 992, repair spool frame 993 and repair telescopic link 994's one end fixed connection, repair telescopic link 994's the other end and repair the one end of fixed pin 995 articulated, repair fixed pin 995 and insert in the adjacent heat-exchange tube.

To the heat exchange tube that has the leak source, measure the length of heat exchange tube with the ruler outside the heat exchanger, before sending locking mechanism 9 into the heat exchange tube, will repair the degree of depth rope 996 and be connected with locking mechanism 9, and will repair the fixed pin 995 on the degree of depth chi 99 and insert in the adjacent heat exchange tube and fix, the pulling is repaired telescopic link 994 and is adjusted the position of repairing spool 991, make the axis of repairing the degree of depth rope 996 and heat exchange tube parallel, drive locking mechanism 9 through promoting the body of rod 91 and advance the pulling and repair degree of depth rope 996, drive and repair spool 991 and rotate, repair volute spring 992 simultaneously and make and repair degree of depth rope 996 and straighten.

Detailed description of the invention seventeen

The method for repairing a pipeline of an air conditioner without replacing a pipe disclosed in this embodiment is implemented on a pipeline repairing device for a central air conditioner according to an eleventh, twelfth, thirteenth, fourteenth, fifteenth or sixteenth specific embodiment, and includes the following steps:

step a: cutting a section of elastic sleeve 7 with the length larger than the leakage point, respectively embedding two expansion rings 8 into two ends of the elastic sleeve 7, respectively rotating two lead screw gears 84, driving a positive and negative lead screw 83 to rotate through the lead screw gears 84, and pushing the sleeves 82 on two sides to move outwards through the positive and negative lead screw 83 so that the two expansion rings 8 support the two ends of the elastic sleeve 7;

step b: adjusting the distance between two gear seats 92 on the locking mechanism 9 to adapt to the positions of two expansion rings 8, screwing a positioning bolt on the gear seat 92 to lock the gear seat 92, inserting the locking mechanism 9 into the elastic sleeve 7, driving the clamping plate 96 to move upwards by starting the lifting motor 95, enabling the locking gears on the two gear seats 92 to be respectively meshed with the two lead screw gears 84, and simultaneously enabling two clamping arms on the clamping plate 96 to be clamped from the lower end of the sleeve 82;

step c: the locking mechanism 9 is sent into the heat exchange tube, so that the elastic sleeve 7 at the front end of the locking mechanism 9 completely covers the leakage point, and the two expansion rings 8 are respectively positioned at two sides of the leakage point;

step d: starting a locking motor 93, enabling the locking motor 93 to enable two locking gears to synchronously rotate through a synchronous belt 94 to drive two lead screw gears 84 to rotate, enabling the lead screw gears 84 to drive positive and negative lead screws 83 to rotate, pushing the sleeves 82 on two sides to move outwards through the positive and negative lead screws 83, enabling two expansion rings 8 to support two ends of the elastic sleeve 7 until the two expansion rings 8 fixedly press the elastic sleeve 7 on the inner wall of the heat exchange tube, closing the locking motor 93, starting a lifting motor 95 to rotate reversely, and dropping a clamping plate 96;

step e: and taking out the locking mechanism 9 to finish the repair of the leakage point of the heat exchange tube.

Description of the preferred embodiment eighteen

This embodiment is based on the seventeenth embodiment, except that the length of the elastic sleeve 7 cut in step a is at least 2 times the width of the leak point.

The elastic sleeve 7 is ensured to completely cover the leakage point, and simultaneously, the position error of the leakage point is covered.

Detailed description of the invention nineteen

The present embodiment is based on the seventeenth embodiment, except that in step e, the clamping plate 96 is dropped to the bottom of the expansion ring 8, and the locking mechanism 9 is lifted, so that the locking gears on the two gear seats 92 are disengaged from the two lead screw gears 84 respectively;

the locking device is lifted by the clamping plate 96, so that the locking gear is separated from the lead screw gear 84, the damage of the meshed gear when the locking device is separated is avoided, and the lead screw gear 84 is prevented from loosening by the movement of the locking gear.

The above embodiments are merely illustrative of the present patent and do not limit the scope of the patent, and those skilled in the art can make modifications to the parts thereof without departing from the spirit and scope of the patent.

Claims (2)

1. The depth indication method is characterized by being applied to a central air-conditioning heat exchange tube leakage point detection device, and the central air-conditioning heat exchange tube leakage point detection device comprises the following steps: the device comprises an industrial personal computer (1), a detection head (2), a plugging sleeve (3), a sleeve extruding device (4), a measuring head moving device (5) and a depth gauge (6), wherein an axial through hole is formed in the detection head (2), the upper end of the through hole is connected with the industrial personal computer (1) through a vacuum tube, a cup-shaped structure with the outer diameter gradually increased is arranged at the lower end of the detection head (2), the plugging sleeve (3) is sleeved on the cup-shaped structure, the sleeve extruding device (4) is sleeved in the middle of the detection head (2), the lower end of the sleeve extruding device (4) is fixedly connected with the upper end of the plugging sleeve (3), and the measuring head moving device (5) is further sleeved at the upper end of the detection head (2);

the bushing press (4) comprises: the device comprises a thrust bearing (41), a rotary lantern ring (42), a lantern ring driving ring (43), a driving ring screw rod (44) and a driving motor (45), wherein the thrust bearing (41) is movably sleeved on a detection head (2), the lower end face of the thrust bearing (41) is fixedly connected with the upper end face of a plugging sleeve (3), a limit ring (411) is arranged on the outer side of the thrust bearing (41), one end of the limit ring (411) is fixedly connected with one end of the thrust bearing (41), the other end of the limit ring (411) is provided with an outer edge which is axially limited for the other end of the thrust bearing (41), the upper end of the thrust bearing (41) is fixedly connected with the rotary lantern ring (42), the rotary lantern ring (42) is sleeved on the detection head (2), the inner side of the rotary lantern ring (42) is connected with the detection head (2) through threads, and a plurality of axial through holes are further formed in the rotary lantern ring (42), the device comprises a rotating sleeve ring (42), a plurality of axial through holes are circumferentially arranged on the rotating sleeve ring (42) in an annular equal division manner, a sleeve ring driving ring (43) is arranged above the rotating sleeve ring (42), the sleeve ring driving ring (43) is sleeved on a detection head (2) through a bearing, a plurality of polished rods (431) corresponding to the axial through holes in the rotating sleeve ring (42) are arranged on the outer side of the sleeve ring driving ring (43), the polished rods (431) penetrate through the axial through holes, a circle of annular teeth are arranged on the outer wall of the upper end of the sleeve ring driving ring (43), the annular teeth are meshed with two driving ring lead screws (44), the two driving ring lead screws (44) are symmetrically arranged, the two driving ring lead screws (44) are connected with a driving motor (45) through gears, and the driving motor (45) is fixedly connected with the detection head (2);

the probe movement device (5) comprises: the measuring head movement device comprises a measuring head movement motor (51), a bearing (52), a hinged arm (53) and a movement wheel (54), wherein the bearing (52) in the measuring head movement device (5) is sleeved on a detection head (2), the outer ring of the bearing (52) is provided with a circle of annular teeth, the annular teeth are connected with two measuring head movement motors (51) through gears, the two measuring head movement motors (51) are symmetrically arranged, the two measuring head movement motors (51) are fixedly connected with the detection head (2), the outer ring of the bearing (52) in the measuring head movement device (5) is also hinged with a plurality of hinged arms (53), the plurality of hinged arms (53) are arranged in an annular equal-dividing circle, one end of each hinged arm (53) is connected with the outer ring of the bearing (52) through a spring, the other end of each hinged arm (53) extends outwards, one end of each hinged arm (53) extending outwards is provided with the movement wheel (54), the moving wheel (54) is arranged obliquely;

the depth gauge (6) comprises: the device comprises a scroll (61), a scroll spring (62), a scroll frame (63), a telescopic rod (64), a fixing pin (65) and a depth rope (66), wherein depth identification scales are arranged on the depth rope (66), one end of the depth rope (66) is connected with a detection head (2), the other end of the depth rope (66) is wound on the scroll (61), two ends of the scroll (61) are rotatably connected with the rotary shaft frame (63), the scroll spring (62) is arranged between the scroll (61) and the rotary shaft frame (63), the scroll frame (63) is fixedly connected with one end of the telescopic rod (64), the other end of the telescopic rod (64) is hinged with one end of the fixing pin (65), and the fixing pin (65) is inserted into an adjacent heat exchange pipe;

for a heat exchange tube with a leakage point, the length of the heat exchange tube is measured by a ruler outside the heat exchanger, one end of the heat exchange tube is continuously plugged by a leakage point detection device, before the leakage point detection device at the other end of the heat exchange tube is inserted into the heat exchange tube, a depth rope (66) is connected with the leakage point detection device, a fixed pin (65) on a depth ruler (6) is inserted into an adjacent heat exchange tube to be fixed, a telescopic rod (64) is pulled to adjust the position of a scroll, the depth rope (66) is made to be parallel to the axis of the heat exchange tube, the leakage point detection device advances to pull the depth rope (66) to drive the scroll (61) to rotate, meanwhile, a volute spring (62) straightens the depth rope (66), the advancing distance of the leakage point detection device is subtracted by the length of the heat exchange tube, and the distance from the leakage point to one end of the heat exchange tube is obtained.

2. A leak source detection method with a depth indication method is characterized by being applied to a pipeline of a lithium bromide refrigerating unit and comprising the following steps of:

step a: injecting protective gas into the lithium bromide unit until the pressure inside the unit is the same as the atmospheric pressure, opening flanges at two ends of the heat exchange tube, and washing and drying the heat exchange tube;

step b: a leak point detection device is respectively inserted into two ends of the heat exchange tube, a driving ring screw rod (44) is driven to rotate by a driving motor (45) in the leak point detection device, the driving ring screw rod (44) pushes a lantern ring driving ring (43) to rotate, the lantern ring driving ring (43) drives a rotary lantern ring (42) to rotate through a polished rod (431) at the lower end, the rotary lantern ring (42) moves downwards through a thread on the detection head (2), the rotary lantern ring (42) pushes a thrust bearing (41) to move downwards, the thrust bearing (41) downwards extrudes a plugging sleeve (3), and the lower end of the plugging sleeve (3) is expanded under the expansion of a cup-shaped structure at the lower end of the detection head (2) to plug two ends of the heat exchange tube;

step c: opening the industrial personal computer (1), pumping the vacuum tube into a negative pressure state through the vacuum tube and an axial through hole in the detection head (2) by the industrial personal computer (1), maintaining pressure, and judging whether a leakage point exists on the heat exchange tube or not through the pressure maintaining;

step d: for a heat exchange tube with a leakage point, the length of the heat exchange tube is measured by a ruler outside the heat exchanger, one end of the heat exchange tube is continuously blocked by a leakage point detection device, the leakage point detection device at the other end of the heat exchange tube is connected with a depth rope (66), a fixed pin (65) on a depth ruler (6) is inserted into an adjacent heat exchange tube for fixing, a telescopic rod (64) is pulled to adjust the position of a scroll, the depth rope (66) is enabled to be parallel to the axis of the heat exchange tube, the leakage point detection device advances to pull the depth rope (66) to drive the scroll (61) to rotate, meanwhile, a volute spring (62) enables the depth rope (66) to be straightened, the leakage point detection device at the other end of the heat exchange tube enables a driving motor (45) to rotate reversely, a measuring head movement motor (51) is started after a blocking sleeve (3) is withdrawn, and the measuring head movement motor (51) drives the outer ring of a bearing (52) to rotate through a gear, the outer ring of the bearing (52) drives a plurality of hinged arms (53) to rotate, the hinged arms (53) drive a moving wheel (54) to roll along the inner wall of the heat exchange tube, the leak point detection device is pushed to advance, vacuum pressure maintaining is carried out again after the distance of one end of the leak point detection device advances, the advancing and pressure maintaining operations are repeated until the leak point detection device crosses the position of the leak point, the advancing distance of the leak point detection device is subtracted by the length of the heat exchange tube, and the distance between the leak point and one end of the heat exchange tube is obtained;

in step d, the depth gauge (6) comprises: the device comprises a scroll (61), a scroll spring (62), a scroll frame (63), a telescopic rod (64), a fixing pin (65) and a depth rope (66), wherein depth identification scales are arranged on the depth rope (66), one end of the depth rope (66) is connected with a detection head (2), the other end of the depth rope (66) is wound on the scroll (61), two ends of the scroll (61) are rotatably connected with the rotary shaft frame (63), the scroll spring (62) is arranged between the scroll (61) and the rotary shaft frame (63), the scroll frame (63) is fixedly connected with one end of the telescopic rod (64), the other end of the telescopic rod (64) is hinged with one end of the fixing pin (65), and the fixing pin (65) is inserted into an adjacent heat exchange pipe;

step e: repeating the operation in the step c on the other side of the heat exchange tube to obtain the distance between the leakage point and the other end of the heat exchange tube, further obtaining the position of the leakage point in the heat exchange tube and repairing the leakage point;

the leakage point detection method with the depth indication method is realized on a central air-conditioning heat exchange tube leakage point detection device, and the central air-conditioning heat exchange tube leakage point detection device comprises the following steps: the device comprises an industrial personal computer (1), a detection head (2), a plugging sleeve (3), a sleeve extruding device (4), a measuring head moving device (5) and a depth gauge (6), wherein an axial through hole is formed in the detection head (2), the upper end of the through hole is connected with the industrial personal computer (1) through a vacuum tube, a cup-shaped structure with the outer diameter gradually increased is arranged at the lower end of the detection head (2), the plugging sleeve (3) is sleeved on the cup-shaped structure, the sleeve extruding device (4) is sleeved in the middle of the detection head (2), the lower end of the sleeve extruding device (4) is fixedly connected with the upper end of the plugging sleeve (3), and the measuring head moving device (5) is further sleeved at the upper end of the detection head (2);

the bushing press (4) comprises: the device comprises a thrust bearing (41), a rotary lantern ring (42), a lantern ring driving ring (43), a driving ring screw rod (44) and a driving motor (45), wherein the thrust bearing (41) is movably sleeved on a detection head (2), the lower end face of the thrust bearing (41) is fixedly connected with the upper end face of a plugging sleeve (3), a limit ring (411) is arranged on the outer side of the thrust bearing (41), one end of the limit ring (411) is fixedly connected with one end of the thrust bearing (41), the other end of the limit ring (411) is provided with an outer edge which is axially limited for the other end of the thrust bearing (41), the upper end of the thrust bearing (41) is fixedly connected with the rotary lantern ring (42), the rotary lantern ring (42) is sleeved on the detection head (2), the inner side of the rotary lantern ring (42) is connected with the detection head (2) through threads, and a plurality of axial through holes are further formed in the rotary lantern ring (42), the device comprises a rotating sleeve ring (42), a plurality of axial through holes are circumferentially arranged on the rotating sleeve ring (42) in an annular equal division manner, a sleeve ring driving ring (43) is arranged above the rotating sleeve ring (42), the sleeve ring driving ring (43) is sleeved on a detection head (2) through a bearing, a plurality of polished rods (431) corresponding to the axial through holes in the rotating sleeve ring (42) are arranged on the outer side of the sleeve ring driving ring (43), the polished rods (431) penetrate through the axial through holes, a circle of annular teeth are arranged on the outer wall of the upper end of the sleeve ring driving ring (43), the annular teeth are meshed with two driving ring lead screws (44), the two driving ring lead screws (44) are symmetrically arranged, the two driving ring lead screws (44) are connected with a driving motor (45) through gears, and the driving motor (45) is fixedly connected with the detection head (2);

the probe movement device (5) comprises: the measuring head movement device comprises a measuring head movement motor (51), a bearing (52), a hinged arm (53) and a movement wheel (54), wherein the bearing (52) in the measuring head movement device (5) is sleeved on a detection head (2), the outer ring of the bearing (52) is provided with a circle of annular teeth, the annular teeth are connected with two measuring head movement motors (51) through gears, the two measuring head movement motors (51) are symmetrically arranged, the two measuring head movement motors (51) are fixedly connected with the detection head (2), the outer ring of the bearing (52) in the measuring head movement device (5) is also hinged with a plurality of hinged arms (53), the plurality of hinged arms (53) are arranged in an annular equal-dividing circle, one end of each hinged arm (53) is connected with the outer ring of the bearing (52) through a spring, the other end of each hinged arm (53) extends outwards, one end of each hinged arm (53) extending outwards is provided with the movement wheel (54), the moving wheel (54) is arranged obliquely; the detection head (2) is conveyed into the heat exchange tube through the measuring head movement device (5), the heat exchange tube is subjected to segmented detection, the depth of the detection head (2) in the heat exchange tube is obtained according to the extension length of a vacuum tube connected to the detection head (2), and the specific position of a leakage point is determined.

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