CN113446614A - Flue gas waste heat recovery device - Google Patents

Abstract

The application discloses flue gas waste heat recovery device, it is including box, inlet tube, outlet pipe and the heat pipe that is equipped with the inner chamber, set up the exhaust port that is linked together with the boiler flue on the box, the both ends of heat pipe respectively with inlet tube and play water piping connection, set up the access hole that box inner chamber is linked together on the box, the access hole is used for supplying the heat pipe to pass, can dismantle on the box and be connected with the access cover that is used for shielding the access hole, can dismantle on the heat pipe and be connected with the smoke blocking cover that is used for shielding the access hole, the smoke blocking cover slides in box inner chamber, the heat pipe includes many straight tubes and many return bends that are used for connecting adjacent straight tube, set up the sliding hole that supplies the straight tube to slide and set up on the access cover, be connected with the gliding fixed establishment of restriction straight tube on the box. This application has the effect that can overhaul the heat pipe under the condition of not shutting down the boiler.

Description

Flue gas waste heat recovery device

Technical Field

The application relates to the technical field of thermal power energy conservation, in particular to a flue gas waste heat recovery device.

Background

A thermal power plant is a plant that produces electric energy using combustible materials as fuel. In the thermal power generation process, coal is combusted to generate a large amount of flue gas, and the flue gas waste heat recovery device is installed at a boiler smoke hole, so that flue gas waste heat is recovered to heat domestic water or supplement water of a boiler, and the utilization rate of resources is improved.

In the related art, as shown in fig. one, the flue gas waste heat recovery device includes a box 1 having a smoke vent 11, a water inlet pipe 33, a water outlet pipe 34, and a heat pipe 3 having two ends connected to the water inlet pipe 33 and the water outlet pipe 34, where the smoke vent 11 is used for communicating with a flue of a boiler.

With respect to the related art among the above, the inventors consider that the following drawbacks exist: after the flue gas waste heat recovery device works for a long time, the flue gas can cause dust deposition on the heat conduction pipe, so that the heat conduction performance of the heat conduction pipe is influenced. Therefore, the heat pipe needs to be repaired and cleaned. And the heat conducting pipe is overhauled, and the boiler needs to be shut down so as to avoid the leakage of the flue gas. However, because the cost of shutting down the boiler is high, the boiler can be shut down for a long time, so that the heat conduction pipe can be overhauled for a long time to be improved.

Disclosure of Invention

In order to can overhaul the heat pipe under the condition of not shutting down the boiler, this application provides a flue gas waste heat recovery device.

The application provides a flue gas waste heat recovery device adopts following technical scheme:

the utility model provides a flue gas waste heat recovery device, includes box, inlet tube, outlet pipe and the heat pipe that is equipped with the inner chamber, set up the exhaust port that is linked together with the boiler flue on the box, the both ends of heat pipe respectively with inlet tube and play water piping connection, set up the access hole that box inner chamber is linked together on the box, the access hole is used for supplying the heat pipe to pass, can dismantle on the box and be connected with the access cover that is used for shielding the access hole, can dismantle on the heat pipe and be connected with the smoke blocking cover that is used for shielding the access hole, the smoke blocking cover slides in box inner chamber, the heat pipe includes many straight tubes and many return bends that are used for connecting adjacent straight tube, set up the slip hole that supplies the straight tube to slide and set up on the access cover, be connected with the gliding fixed establishment of restriction straight tube on the box.

Through adopting above-mentioned technical scheme, when overhauing the heat pipe, break off the inlet tube earlier and outlet pipe and be connected in water route, remove the restriction of fixed establishment to the straight tube again, then slide in the slide opening through pulling the heat pipe so that the straight tube. The smoke blocking cover connected to the heat conduction pipe is driven by the heat conduction pipe to cover the access hole, so that the effect of blocking the leakage of smoke in the access hole is achieved. And then opening the connection between the access cover and the box body and the connection between the heat conduction pipe and the smoke blocking cover, and finally taking down the access cover and the heat conduction pipe together. Through above-mentioned structure, because hinder the petticoat pipe and blockked that the flue gas leaks outward for when the staff dismantles the heat pipe and overhauls, need not to shut down the boiler. Compare in need and just can overhaul the heat pipe after treating that the boiler closes, through above-mentioned structure for the staff can carry out many times at the in-process of boiler long-term operation and overhaul the deashing by the heat pipe, with the heat conductivility of guarantee heat pipe, thereby improved the waste heat utilization ratio to in the flue gas.

Optionally, be provided with dwang and straining piece on the box, the dwang runs through and fixed connection is on the straining piece, the straining groove of confession straining piece stretching into is seted up to the access cover, the dwang rotates to be connected on the box, be provided with on the dwang and be used for driving the straining piece to be close to access hole direction pivoted straining torsional spring.

Through adopting above-mentioned technical scheme, when separation access cover and box, it can to keeping away from the direction rotation of access hole with the piece of fastening. When connecting access cover and box, after covering the access hole through the access cover, the straining piece rotates to the direction that is close to the access hole, and until the straining piece rotates and stretch into the straining groove to self tip, the straining torsional spring has restricted the straining piece and has shifted out from the straining groove to restricted access cover and box separation.

Optionally, a linkage groove has been seted up on the box outer wall, it is provided with linkage piece and unblock rack to slide in the linkage groove, unblock rack connection is on the linkage piece, be connected with on the dwang with unblock rack toothing's unblock gear, the tank bottom in linkage groove sets up the unblock hole that is linked together with the box inner chamber, be connected with the unblock piece on the cigarette blocking cover, the unblock hole is used for supplying the unblock piece to slide and sets up.

Through adopting above-mentioned technical scheme, when driving through the heat pipe and hindering the petticoat pipe and moving to the direction that is close to the access hole, the tip of unblock piece passes the unblock hole and inserts the linkage groove, and the unblock piece supports to press on the linkage piece and drive the unblock rack through the linkage piece and move, and the unblock rack passes through unblock gear and dwang drive lock piece and rotates to the direction of keeping away from the access hole, until hindering the petticoat pipe to move to contacting with the box inner wall. Through the structure, when the worker moves the smoke blocking hood through the heat conduction pipe, the locking of the fastening block to the access cover can be opened through the movement of the smoke blocking hood, and the worker can disassemble the access cover and the box body conveniently.

Optionally, a limiting block is arranged on the unlocking rack, a stop block is arranged on the box body in a sliding mode, and a stop spring used for driving the stop block to move to a position between the limiting block and the box body is connected to the stop block.

Through adopting above-mentioned technical scheme, when the unblock rack shifts out the straining groove through unblock gear and dwang drive straining piece, the unblock rack drives the stopper and removes for interval crescent between stopper and the box outer wall. When the spacing between stopper and the box outer wall enlarges to the dog when can pass through, locking spring drive dog moves to between stopper and the box to restricted the unblock rack and withdrawed the linkage groove, and then restricted unblock gear, dwang and the effect of straining the piece and rotated down at the straining torsional spring.

Through above-mentioned structure for hinder the cigarette cover and shield the access hole after, remove the power of applying on the heat pipe, hinder the cigarette cover and also can not reset under the effect of straining torsional spring because of the linkage piece, and lead to hindering the cigarette cover and remove to the direction of keeping away from the access hole.

Optionally, a yielding hole for the limiting block to penetrate is formed in the stop block, a yielding inclined plane is arranged at the end portion, close to the access hole, of the stop block, the yielding inclined plane faces away from the box body, and when the stopping spring is in a natural state, the yielding hole is staggered with the stop block.

Through adopting above-mentioned technical scheme, when shielding the access hole through the access cover, will access cover to the direction removal that is close to the access hole, access cover supports presses and lets on the inclined plane and drive the dog remove. When the dog moved to the hole of stepping down and the stopper aligns, under the effect of straining torsional spring, the stopper stretched into the hole of stepping down, and unblock rack, unblock gear, dwang and straining piece linkage, straining piece stretched into the straining groove and removed in order to restrict the access cover.

It is optional, set up the rotation chamber that communicates with the linkage groove on the inner wall of box, be provided with the locking hook in the rotation chamber, the shifting chute has all been seted up on the double-phase chamber wall that rotates the chamber, it is provided with the carriage release lever to slide in the shifting chute, the carriage release lever runs through and rotates the connection on the locking hook, the tip of locking hook is articulated with the linkage piece, hinder the cigarette cover including hindering the cigarette board and connecting and hinder the cigarette ring that hinders that the cigarette board is close to access hole one side, hinder and seted up the locking groove on the cigarette ring, the locking groove is used for cooperating with locking hook tip joint.

By adopting the technical scheme, when the unlocking block is pressed on the linkage block and pushes the linkage block to move towards the outer side of the box body, the linkage block drives the end part of the stop hook to move, and the stop hook drives the moving block to move in the moving groove. Along with the sliding of the linkage block, the end part of the stop hook, which is far away from the linkage block, rotates towards the direction close to the inner cavity of the box body until the end part of the stop hook is in clamping fit with the stop groove. The end part of the stop hook is in clamping fit with the stop groove, so that the smoke-resistant cover is limited to move continuously after covering the access hole, and the smoke-resistant effect of the smoke-resistant cover is improved. And after the maintenance cover is installed back to the original position after the maintenance is finished, the stop hook is reset to be opened to be matched with the clamping connection of the stop groove, and the operation of workers is facilitated.

Optionally, the smoke blocking cover further comprises a connecting plate connected to the inner wall of the smoke blocking ring, a conducting hole for the straight pipe and the end part of the bent pipe to extend into and a connecting hole for the straight pipe to extend into are formed in the connecting plate, the connecting hole is communicated with the conducting hole, and the height of the connecting hole is smaller than that of the conducting hole.

Through adopting above-mentioned technical scheme, when being connected heat pipe and smoke barrier cover, hang up the heat pipe earlier, then insert the conducting hole with the return bend and the straight tube of heat pipe one side, descend the heat pipe afterwards to make the straight tube stretch into the connecting hole. When the heat conduction pipe pushes the smoke-blocking cover to reset, the bent pipe is pressed on the smoke-blocking plate and drives the smoke-blocking ring and the connecting plate to move through the smoke-blocking plate. When the heat conduction pipe drives the smoke blocking cover to move towards the direction close to the access hole, the bent pipe drives the smoke blocking plate and the smoke blocking ring to move through the connecting plate. The structure has the advantages that the heat conduction pipe and the smoke blocking cover can be detachably connected, and meanwhile, the structure is simple, and the production and the manufacturing are convenient.

Optionally, the fixing mechanism includes a fixing cover plate and a fixing bolt, the fixing cover plate abuts against one side of the heat pipe far away from the smoke barrier, a rod portion of the fixing bolt penetrates through the fixing cover plate and is slidably disposed on the fixing cover plate, and the rod portion of the fixing bolt is in threaded connection with the box body.

Through adopting above-mentioned technical scheme, through promoting the heat pipe in order to drive the cigarette board and to hinder cigarette board and box inner wall butt back, establish fixed apron lid on the heat pipe to with fixing bolt and box threaded connection, so that one side that the cigarette board was kept away from at the heat pipe to fixed apron butt, thereby restriction heat pipe and the slip of cigarette cover that hinders.

In summary, the present application includes at least one of the following benefits:

1. when the heat conduction pipe is overhauled, the heat conduction pipe is pulled to drive the smoke blocking cover to shield the access hole, then the access cover is detached and the heat conduction pipe and the access hole are separated, so that workers can overhaul the heat conduction pipe without closing a boiler, the heat conduction performance of the heat conduction pipe is guaranteed, and the utilization rate of waste heat in smoke is improved;

2. when the access hole is shielded by the smoke-blocking cover, the smoke-blocking cover is driven by the heat conduction pipe, the unlocking block on the smoke-blocking cover is abutted against the linkage block, and the linkage block, the unlocking spring, the unlocking gear and the rotating rod are linked, so that the fastening block is driven to rotate towards the direction far away from the access hole to open the locking of the access cover of the fastening block;

3. when the linkage piece moves to being close to the box outside, linkage piece, stop hook and movable block linkage to make the tip of stop hook rotate to the direction that is close to the box inner chamber, the tip and the locking groove joint cooperation until the stop hook, slide with the restriction petticoat pipe, through above-mentioned structure, need not staff manual operation, when releasing the locking piece and drive the lock piece rotation through the petticoat pipe, still can restrict the petticoat pipe and slide.

Drawings

Fig. 1 is a schematic structural diagram of the background art.

Fig. 2 is a schematic structural diagram of an embodiment of the present application.

FIG. 3 is a schematic view showing the structure of the heat pipe, the water inlet pipe and the water outlet pipe.

Fig. 4 is a schematic view showing the structure of the protruding stopper hook in the embodiment of the present application.

Fig. 5 is an enlarged schematic view at a in fig. 2.

Fig. 6 is an enlarged schematic view at B in fig. 4.

Fig. 7 is a schematic structural view highlighting a smoke blocking cover in an embodiment of the present application.

FIG. 8 is a schematic diagram illustrating a partial explosion of a bump stopper in an embodiment of the present application

Description of reference numerals:

1. a box body; 11. a smoke vent; 12. an access hole; 13. a linkage groove; 131. unlocking the hole; 132. a limiting groove; 14. mounting grooves; 15. a stopper; 151. a hole of abdication; 152. a abdication inclined plane; 16. a stopper spring; 17. a rotation chamber; 171. a moving groove; 2. a smoke blocking hood; 21. a smoke barrier; 211. unlocking the block; 22. a smoke blocking ring; 221. a stopper groove; 23. a connecting plate; 231. a via hole; 232. connecting holes; 3. a heat conducting pipe; 31. a straight pipe; 32. bending the pipe; 33. a water inlet pipe; 331. a water inlet; 34. a water outlet pipe; 341. a water outlet; 4. an access cover; 41. a positioning ring; 42. a slide hole; 43. a fastening groove; 5. a fixing mechanism; 51. fixing the cover plate; 52. fixing the bolt; 6. rotating the rod; 61. a rotating seat; 62. a fastening block; 63. fastening the torsion spring; 64. unlocking the gear; 7. a linkage block; 71. unlocking the rack; 72. a limiting block; 73. a stop hook; 74. the rod is moved.

Detailed Description

The present application is described in further detail below with reference to figures 2-8.

The embodiment of the application discloses flue gas waste heat recovery device. Referring to fig. 2, the flue gas waste heat recovery device comprises a box body 1 with an inner cavity, a smoke-blocking cover 2 arranged in the inner cavity of the box body 1 in a sliding manner, five heat conduction pipes 3 detachably connected with the smoke-blocking cover 2, a water inlet pipe 33 and a water outlet pipe 34 connected to the heat conduction pipes 3, an access cover 4 detachably connected to the box body 1, and a fixing mechanism 5 connected to the box body 1.

Referring to fig. 2 and 3, two ends of the heat pipe 3 are respectively welded and fixed to the water inlet pipe 33 and the water outlet pipe 34, and the inner cavity of the heat pipe 3 is communicated with the inner cavities of the water inlet pipe 33 and the water outlet pipe 34. The heat conduction pipes 3 are arranged in a snake shape, each heat conduction pipe 3 comprises a plurality of straight pipes 31 and an elbow pipe 32 which are integrally formed, each straight pipe 31 is arranged in parallel, and the elbow pipe 32 is connected with two adjacent straight pipes 31. The inlet pipe 33 and the outlet pipe 34 are arranged in parallel, and the heat conduction pipes 3 are uniformly distributed along the length direction of the inlet pipe 33 and the outlet pipe 34. The water inlet pipe 33 is integrally formed with a water inlet 331, the water outlet pipe 34 is integrally formed with a water outlet 341, and both the water outlet 341 and the water inlet 331 are used for being connected with a water path.

Referring to fig. 2 and 4, the box body 1 is provided with a smoke vent 11 communicated with an inner cavity of the box body and an access hole 12, the smoke vent 11 is communicated with a flue of the boiler, and the access hole 12 is used for allowing the heat conduction pipe 3 to pass through. The smoke blocking cover 2 is slid in a direction close to the access opening 12 or away from the access opening 12, and the access cover 4 is used to shield the access opening 12.

Referring to fig. 2 and 4, the positioning ring 41 is integrally formed on the access cover 4, the access opening 12 is used for inserting the positioning ring 41, and the positioning ring 41 plays a positioning role. The access cover 4 is penetrated with sliding holes 42 with the same number as the straight pipes 31, and the sliding holes 42 are used for the sliding arrangement of the straight pipes 31.

Referring to fig. 2 and 4, the outer wall of the box body 1 provided with the access hole 12 is rotatably connected with four rotating rods 6, and the rotating rods 6 are circumferentially and uniformly distributed along the central line of the access hole 12. The both ends of each dwang 6 all are provided with and rotate seat 61, rotate seat 61 and box 1 outer wall fixed connection, and dwang 6 rotates to be connected on rotating seat 61.

Referring to fig. 4 and 5, each of the pivot levers 6 is provided with a fastening block 62, and the pivot lever 6 is fixedly connected to the fastening block 62 by passing through it. The cover is equipped with straining torsional spring 63 on the dwang 6, and two atress ends of straining torsional spring 63 are respectively with box 1 and adjacent straining piece 62 fixed connection, and straining torsional spring 63 is used for driving the direction rotation that the piece 62 is buckled to being close to access hole 12 to straining. Four fastening grooves 43 are formed in the access cover 4, and the fastening grooves 43 are used for the fastening blocks 62 to extend into.

Referring to fig. 4 and 5, when the access opening 12 is covered with the access cover 4, the positioning ring 41 is first inserted into the access opening 12. The fastening block 62 rotates towards the direction close to the access opening 12 under the action of the fastening torsion spring 63 until the fastening block 62 rotates to the end thereof to extend into the fastening groove 43 and abut against the groove wall of the fastening groove 43.

Referring to fig. 5 and 6, two unlocking gears 64 are fixedly connected to each rotating rod 6, and the two unlocking gears 64 are respectively located at two sides of the fastening block 62. The outer wall of the box body 1 is provided with linkage grooves 13 with the same number as the unlocking gears 64, each linkage groove 13 is internally provided with a linkage block 7 and an unlocking rack 71 in a sliding manner, and the end part of each unlocking rack 71 is fixedly connected with the linkage block 7. The unlocking rack 71 is located on the side of the adjacent unlocking gear 64 near the service opening 12, and the unlocking rack 71 is meshed with the adjacent unlocking gear 64.

Referring to fig. 4 and 7, the smoke-blocking cover 2 comprises a smoke-blocking plate 21, a smoke-blocking ring 22 fixed on one side of the access opening 12 of the smoke-blocking plate 21 close to one side, and two connecting plates 23 connected to the inner wall of the smoke-blocking ring 22, wherein the two connecting plates 23 are respectively fixed on two opposite inner walls of the smoke-blocking ring 22.

Referring to fig. 6 and 7, the side of the smoke blocking ring 22 away from the smoke blocking plate 21 is fixed with unlocking blocks 211 the number of which is the same as that of the linkage blocks 7, the bottom of the linkage groove 13 is provided with unlocking holes 131 communicated with the inner cavity of the box body 1, the width of each unlocking hole 131 is smaller than that of the linkage groove 13, and each unlocking hole 131 is used for allowing the unlocking block 211 to slide.

Referring to fig. 5 and 8, the outer wall of the box body 1 provided with the access opening 12 is provided with mounting grooves 14 with the same number as the unlocking racks 71, and the mounting grooves 14 extend along the direction from the access opening 12 to the direction far away from the access opening 12. A stop block 15 is arranged in the mounting groove 14 in a sliding mode, a stop spring 16 is connected to the stop block 15, the stop spring 16 stretches along the sliding direction of the stop block 15, and two ends of the stop spring 16 are fixedly connected with the stop block 15 and the groove wall of the mounting groove 14 far away from the access hole 12 respectively.

Referring to fig. 5 and 8, the side wall of each unlocking rack 71 is fixed with a limiting block 72, the wall of the linkage groove 13 is provided with a limiting groove 132 communicated with the adjacent mounting groove 14, and the limiting groove 132 is used for the sliding arrangement of the limiting block 72. The stopper 15 is provided with a yielding hole 151, and the yielding hole 151 is used for the limiting block 72 to pass through. The stopping spring 16 is used for driving the stopper 15 to move between the stopper 72 and the box body 1, and when the stopping spring 16 is in a natural state, the abdicating hole 151 and the stopper groove 132 are staggered. The end of the stopper 15 away from the stopper spring 16 is provided with a yielding inclined surface 152, and the yielding inclined surface 152 faces away from the box body 1. When the access cover 4 covers the access opening 12, the avoiding hole 151 is aligned with the limiting groove 132.

Referring to fig. 4 and 6, when the heat pipe 3 drives the smoke blocking cover 2 to move towards the direction close to the access opening 12, the end of the unlocking block 211 passes through the unlocking hole 131 and is pressed against the linkage block 7 to push the linkage block 7 to move towards the direction away from the inner cavity of the box body 1. The linkage block 7 drives the unlocking rack 71 to move, the unlocking rack 71 drives the unlocking gear 64, the rotating rod 6 and the fastening block 62 to rotate together, so that the fastening block 62 rotates towards the direction far away from the access hole 12 until the side wall of the smoke blocking ring 22 abuts against the inner wall of the box body 1, and at the moment, the fastening block 62 rotates to the position perpendicular to the outer wall of the adjacent box body 1.

Referring to fig. 4 and 8, after the side wall of the smoke blocking ring 22 abuts against the inner wall of the box body 1, the access cover 4 is taken down, the stopper 15 moves towards the direction close to the access opening 12 under the action of the stop spring 16, so that the abdicating hole 151 and the limiting groove 132 are staggered, the limiting block 72 is limited to move towards the direction close to the box body 1, and the fastening block 62 is limited to rotate.

Referring to fig. 5 and 8, when the access opening 12 is shielded by the access cover 4, the access cover 4 abuts against the abdicating inclined plane 152 and pushes the stopper 15 to move in a direction away from the access opening 12 until the abdicating hole 151 is aligned with the limiting groove 132, so that the limiting block 72 can move. The fastening block 62 is moved in a direction approaching the fastening groove 43 by the fastening torsion spring 63 until the fastening block 62 extends into the fastening groove 43 and fastens the access cover 4.

Referring to fig. 4 and 6, the inner wall of the box body 1 is provided with rotating cavities 17, the number of which is the same as that of the linkage grooves 13, and the rotating cavities 17 are communicated with the adjacent linkage grooves 13. A stop hook 73 is arranged in the rotating cavity 17, one end of the stop hook 73 is in a hook shape, and the other end of the stop hook 73 is hinged with the adjacent linkage block 7. The two opposite chamber walls of the stopping chamber are both provided with a moving groove 171, a moving rod 74 is arranged in the moving groove 171, two ends of the moving rod 74 are respectively arranged in the adjacent moving grooves 171 in a sliding manner, and the moving rod 74 penetrates through and is rotatably connected to the stopping hook 73. The smoke blocking ring 22 is provided with stop grooves 221 with the same number as that of the stop hooks 73, and the stop grooves 221 are used for clamping and matching hook-shaped ends of the stop hooks 73.

Referring to fig. 4 and 6, when the unlocking block 211 drives the linkage block 7 to move, the linkage block 7 drives the end of the stopping hook 73 to move, the stopping hook 73 drives the moving rod 74 to slide in the moving groove 171, so that the hook-shaped end of the stopping hook 73 rotates towards the direction close to the inner cavity of the box body 1 until the side wall of the smoke blocking ring 22 contacts with the inner wall of the box body 1, and at the moment, the hook-shaped end of the stopping hook 73 is in clamping fit with the stopping groove 221, so that the smoke blocking cover 2 is limited to move towards the direction far away from the access opening 12.

Referring to fig. 3 and 7, the two connecting plates 23 are respectively provided with five via holes 231 and five connecting holes 232 respectively communicated with the adjacent via holes 231, the via holes 231 are uniformly distributed along the vertical direction, and the height of each connecting hole 232 is smaller than that of the via hole 231 communicated with the connecting hole 232. The through hole 231 is for inserting the ends of the straight pipe 31 and the bent pipe 32, and the connection hole 232 is for inserting the straight pipe 31.

Referring to fig. 3 and 7, when the heat transfer pipe 3 and the smoke blocking cover 2 are connected, the heat transfer pipe 3 is lifted up, the straight pipes 31 at both ends of the heat transfer pipe 3 and the ends of the bent pipes 32 are inserted into the through holes 231, and then the heat transfer pipe 3 is lowered so that the straight pipes 31 at both ends of the heat transfer pipe 3 are moved into the connection holes 232.

Referring to fig. 2, the fixing mechanism 5 is used for limiting the sliding of the straight pipe 31, the fixing mechanism 5 includes a fixing cover plate 51 and four fixing bolts 52, a rod portion of each fixing bolt 52 penetrates through and is rotatably connected to the fixing cover plate 51, a rod portion of each fixing bolt 52 is in threaded connection with the box body 1, and each fixing bolt 52 is screwed so that the fixing cover plate 51 abuts against one side of the heat pipe 3 away from the smoke barrier 21.

The implementation principle of the flue gas waste heat recovery device in the embodiment of the application is as follows: when the heat pipe 3 is to be repaired, the fixing bolt 52 is loosened and the fixing cover plate 51 is removed, and then the heat pipe 3 is moved to drive the smoke blocking hood 2 to move. The smoke blocking cover 2 drives the unlocking block 211 to move, and the unlocking block 211 drives the linkage block 7 to move. On one hand, the linkage block 7 is linked through the unlocking rack 71, the unlocking gear 64 and the rotating rod 6, so that the fastening block 62 is driven to rotate towards the direction far away from the access hole 12; on the other hand, the unlocking block 211 is linked through the stopping hook 73 and the moving rod 74, so that the hook-shaped end part of the stopping hook 73 is driven to rotate towards the direction close to the inner cavity of the box body 1 until the smoke blocking ring 22 is abutted against the inner wall of the box body 1, the smoke blocking plate 21 and the smoke blocking ring 22 shield the access opening 12, at the moment, the fastening block 62 is perpendicular to the adjacent outer wall, and the hook-shaped end part of the stopping hook 73 is in clamping fit with the stopping groove 221. Then, the access cover 4 is slid in a direction away from the box body 1, and at this time, the stopper 15 is driven by the stopper spring 16 to move in a direction approaching the access opening 12, so that the receding hole 151 and the limit groove 132 are staggered. Then, the heat transfer pipe 3 is lifted up to move the straight pipe 31 into the through hole 231, and finally, the heat transfer pipe 3 is taken off in communication with the access cover 4.

After the heat pipe 3 is inspected and cleaned, the ends of the straight pipe 31 and the bent pipe 32 at the two ends of the heat pipe 3 are inserted into the through hole 231, and the heat pipe 3 is lowered until the straight pipe 31 moves into the connection hole 232. Then the access cover 4 is moved towards the direction close to the access opening 12 until the positioning ring 41 is inserted into the access opening 12, the access cover 4 shields the access opening 12, the access cover 4 is pressed against the yielding inclined surface 152 and drives the stop block 15 to move, so that the yielding hole 151 is aligned with the limiting groove 132. The fastening torsion spring 63 drives the fastening block 62 to rotate towards the access opening 12 until the fastening block 62 moves into the fastening slot 43 and fastens the access cover 4. The fastening block 62 rotates and simultaneously drives the rotating rod 6, the unlocking gear 64, the unlocking rack 71, the linkage block 7, the stopping hook 73 and the moving rod 74 to be linked, so that the hook-shaped end of the stopping hook 73 rotates in a direction away from the inner cavity of the box body 1, and the hook-shaped end of the stopping hook 73 moves out of the stopping groove 221. Then, the heat pipe 3 is pushed to drive the smoke blocking cover 2 to move, after the smoke blocking plate 21 moves to the side wall of the smoke blocking plate to abut against the inner wall of the box 1, the fixed cover plate 51 is fixed on the box 1 through the fixing bolt 52, and the fixed cover plate 51 abuts against one side of the heat pipe 3 far away from the smoke blocking plate 21 to limit the movement of the heat pipe 3 and the smoke blocking plate 21.

Through the structure, the heat conduction pipes 3 can be overhauled without closing the boiler by workers, the heat conduction performance of the heat conduction pipes 3 is guaranteed, and the utilization rate of waste heat in flue gas is improved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. The utility model provides a flue gas waste heat recovery device, is including box (1), inlet tube (33), outlet pipe (34) and heat pipe (3) that are equipped with the inner chamber, set up smoke vent (11) that are linked together with the boiler flue on box (1), the both ends of heat pipe (3) are connected its characterized in that with inlet tube (33) and outlet pipe (34) respectively: offer access hole (12) that box (1) inner chamber is linked together on box (1), access hole (12) are used for supplying heat pipe (3) to pass, can dismantle on box (1) and be connected with access cover (4) that are used for shielding access hole (12), can dismantle on heat pipe (3) and be connected with smoke blocking cover (2) that are used for shielding access hole (12), smoke blocking cover (2) slide in box (1) inner chamber, heat pipe (3) include many straight tube (31) and many return bend (32) that are used for connecting adjacent straight tube (31), set up sliding hole (42) that supply straight tube (31) to slide the setting on access cover (4), be connected with on box (1) and restrict the gliding fixed establishment (5) of straight tube (31).

2. The flue gas waste heat recovery device according to claim 1, characterized in that: be provided with dwang (6) and straining piece (62) on box (1), dwang (6) run through and fixed connection on straining piece (62), set up on access cover (4) and supply straining piece (62) to stretch into straining groove (43), dwang (6) are rotated and are connected on box (1), be provided with on dwang (6) and be used for driving straining piece (62) to being close to access hole (12) direction pivoted straining torsional spring (63).

3. The flue gas waste heat recovery device according to claim 2, characterized in that: linkage groove (13) have been seted up on box (1) outer wall, it is provided with linkage piece (7) and unblock rack (71) to slide in linkage groove (13), unblock rack (71) are connected on linkage piece (7), be connected with unblock gear (64) with unblock rack (71) meshing on dwang (6), unblock hole (131) that are linked together with box (1) inner chamber are seted up to the tank bottom of linkage groove (13), be connected with on the resistance petticoat pipe (2) and unlock piece (211), unblock hole (131) are used for supplying to unlock piece (211) to slide the setting.

4. The flue gas waste heat recovery device according to claim 3, characterized in that: the unlocking device is characterized in that a limiting block (72) is arranged on the unlocking rack (71), a stop block (15) is arranged on the box body (1) in a sliding mode, and a stop spring (16) used for driving the stop block (15) to move between the limiting block (72) and the box body (1) is connected to the stop block (15).

5. The flue gas waste heat recovery device according to claim 4, wherein: offer hole of stepping down (151) that supplies stopper (72) to pass on dog (15), the tip that dog (15) are close to access hole (12) is provided with inclined plane of stepping down (152), inclined plane of stepping down (152) box (1) dorsad, when retaining spring (16) are in natural state, hole of stepping down (151) staggers with dog (15).

6. The flue gas waste heat recovery device according to claim 3, characterized in that: offer rotation chamber (17) that are linked together with linkage groove (13) on the inner wall of box (1), be provided with stop hook (73) in rotation chamber (17), moving groove (171) have all been seted up on the double-phase chamber wall that rotates chamber (17), it is provided with carriage release lever (74) to slide in moving groove (171), carriage release lever (74) run through and rotate the connection on stop hook (73), the tip and linkage piece (7) of stop hook (73) are articulated, hinder petticoat pipe (2) including hindering cigarette board (21) and connecting and hindering cigarette ring (22) that hinder cigarette board (21) and be close to access hole (12) one side, hinder and seted up stop groove (221) on cigarette ring (22), stop groove (221) are used for cooperating with stop hook (73) tip joint.

7. The flue gas waste heat recovery device according to claim 1, characterized in that: hinder petticoat pipe (2) still including connecting plate (23) on hindering cigarette ring (22) inner wall, offer on connecting plate (23) and supply conducting hole (231) that straight tube (31) and return bend (32) tip stretched into and supply connecting hole (232) that straight tube (31) stretched into, connecting hole (232) are linked together with conducting hole (231), just the height that highly is less than conducting hole (231) of connecting hole (232).

8. The flue gas waste heat recovery device according to claim 1, characterized in that: the fixing mechanism (5) comprises a fixing cover plate (51) and a fixing bolt (52), the fixing cover plate (51) is abutted to one side, away from the smoke barrier (21), of the heat conduction pipe (3), the rod part of the fixing bolt (52) penetrates through and is arranged on the fixing cover plate (51) in a sliding mode, and the rod part of the fixing bolt (52) is in threaded connection with the box body (1).

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