CN111691954A - Novel exhaust waste heat recovery device - Google Patents
Novel exhaust waste heat recovery device Download PDFInfo
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- CN111691954A CN111691954A CN201910181385.9A CN201910181385A CN111691954A CN 111691954 A CN111691954 A CN 111691954A CN 201910181385 A CN201910181385 A CN 201910181385A CN 111691954 A CN111691954 A CN 111691954A
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- heat exchange
- exhaust pipe
- pipe
- cooling liquid
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- 238000011084 recovery Methods 0.000 title claims abstract description 33
- 239000002918 waste heat Substances 0.000 title claims abstract description 31
- 239000000110 cooling liquid Substances 0.000 claims abstract description 45
- 239000007789 gas Substances 0.000 claims abstract description 33
- 239000012188 paraffin wax Substances 0.000 claims abstract description 18
- 230000007246 mechanism Effects 0.000 claims abstract description 14
- 230000008859 change Effects 0.000 claims abstract description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 230000008602 contraction Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 239000002826 coolant Substances 0.000 description 17
- 238000003466 welding Methods 0.000 description 9
- 238000012546 transfer Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
- F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/08—Other arrangements or adaptations of exhaust conduits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention provides a novel exhaust waste heat recovery device, which comprises an inner exhaust pipe, an outer exhaust pipe, a heat exchange shell and an adjusting mechanism, wherein in order to realize timely adjustment and recovery of heat according to requirements, the pipe wall of the inner exhaust pipe is provided with a plurality of first heat exchange holes which are arranged at intervals along the circumferential direction; the outer exhaust pipe is sleeved outside the inner exhaust pipe and can rotate relative to the inner exhaust pipe, and a plurality of second heat exchange holes in one-to-one correspondence with the first heat exchange holes are further formed in the outer exhaust pipe. The invention utilizes the expansion and contraction characteristics of paraffin to push the outer exhaust pipe to rotate relative to the inner exhaust pipe, and realizes the adjustment of the coincidence rate of the first heat exchange hole and the second heat exchange hole, thereby being capable of timely adjusting the quantity of heat exchange gas according to the temperature change of cooling liquid, effectively utilizing the waste heat of an exhaust system, saving energy on the premise of not consuming extra energy, improving the heat efficiency of an engine, and realizing the effect of self-adaptive control of the heat exchange quantity.
Description
Technical Field
The invention belongs to the technical field of engines, and particularly relates to an exhaust waste heat recovery device.
Background
When the engine exhausts tail gas, a large amount of heat (up to 30%) can be taken away, and if the part of heat can be recycled, such as power generation, warming up, battery heating and the like, the load of the engine can be reduced, and the purposes of saving energy and indirectly improving the thermal efficiency of the engine can be achieved.
In the prior art, most of automobile models are not provided with exhaust waste heat recovery devices, and the recovery devices of a part of automobiles are only communicated when heat is needed and are not cut off when the heat is not needed, so that the quantity of the recovered heat cannot be adjusted; although some heat recovery devices of automobiles can adjust the quantity of recovered heat, a control valve is arranged at the separation position of two channels of an air inlet pipe, the recovered heat is controlled by controlling the flow distribution of tail gas between the two channels, and the heat recovery devices do not realize the distribution according to requirements. When heat is not needed, a part of exhaust waste heat is still exchanged by cooling liquid, unnecessary troubles are caused, an air flow channel adopts an independent pipeline design, a heat exchanger is complex, and the cost is high.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: to among the prior art, exhaust waste heat recovery device can not adjust the problem of retrieving the heat in real time according to the demand, provides a novel exhaust waste heat recovery device.
In order to solve the above technical problem, the present invention provides a novel exhaust heat recovery device, including:
the pipe wall of the inner exhaust pipe is provided with a plurality of first heat exchange holes which are arranged at intervals along the circumferential direction;
the outer exhaust pipe is sleeved on the outer side of the inner exhaust pipe and can rotate relative to the inner exhaust pipe, and a plurality of second heat exchange holes which are in one-to-one correspondence with the first heat exchange holes are formed in the outer exhaust pipe;
the heat exchange tube is sleeved on the outer side of the outer exhaust tube, and a first cavity for containing heat exchange gas is formed between the inner wall of the heat exchange tube and the outer wall of the outer exhaust tube;
the heat exchange shell is sleeved outside the heat exchange tube, a second cavity for containing cooling liquid is formed between the inner wall of the heat exchange shell and the outer wall of the heat exchange tube, and the cooling liquid in the second cavity and the heat exchange gas in the first cavity perform countercurrent heat exchange;
and the adjusting mechanism is used for adjusting the coincidence rate of the first heat exchange hole and the second heat exchange hole so as to change the amount of the heat exchange gas flowing into the first cavity.
Further, an installation block is fixedly connected to the outer side pipe wall of the air inlet end of the outer air exhaust pipe, the side wall of the installation block is fixedly connected with a loop bar, and the loop bar extends along the circumferential direction of the pipe wall of the outer air exhaust pipe;
the adjusting mechanism comprises an executing component, a spring and a driving component, wherein the executing component is a hollow round pipe, a first end of the executing component is sleeved on the loop bar, the spring is arranged between a fixed end of the loop bar and the first end of the executing component, two ends of the spring are fixedly connected with the side wall of the mounting block and the first end of the executing component respectively, and the driving component can push the spring to stretch and retract according to the temperature change of the cooling liquid and further drive the outer exhaust pipe to rotate relative to the inner exhaust pipe.
Furthermore, a cooling liquid outlet is formed in one side, close to the air inlet end of the outer exhaust pipe, of the heat exchange shell, and a first through hole is formed in the side wall of the cooling liquid outlet;
the drive assembly includes ball, push rod and arranges in the coolant liquid export and have open-ended holding casing, the ball is provided with a plurality ofly, and is a plurality of the closely knit packing of ball in executive component's inner chamber, be full of paraffin in the holding casing, the opening of holding casing is just right first through-hole, and at the open end with the inside wall of coolant liquid export links firmly, the one end of push rod stretches into in the cavity of executive component's second end and with the ball butt, the other end of push rod stretches into in the first through-hole and with the paraffin butt, executive component's second end with the lateral wall of coolant liquid export links firmly.
Further, the actuating component comprises a straight portion and a curved portion, the straight portion is formed by extending the second end of the actuating component along the horizontal direction, the curved portion is connected between the straight portion and the first end of the actuating component, and the push rod reciprocates in the inner cavity of the straight portion.
Furthermore, a plurality of first heat exchange holes and second heat exchange holes are arranged at equal intervals and are provided with a plurality of groups along the axis direction.
Furthermore, a limiting bump is arranged on the outer side of the pipe wall of the air outlet end of the inner exhaust pipe, and the air outlet end of the outer exhaust pipe is abutted against the limiting bump.
Furthermore, the air outlet end of the outer air outlet pipe is provided with a plurality of bulges and openings which are distributed at intervals along the circumferential direction, and the plurality of bulges are abutted to the limiting lug blocks.
Furthermore, the exhaust waste heat recovery device further comprises an air outlet end cover, the air outlet end cover is sleeved on the air outlet end of the inner exhaust pipe, the air outlet end cover is fixedly connected with the pipe wall of the inner exhaust pipe at the outer side edge, and the inner side end portion of the air outlet end cover is fixedly connected with the end portion of the heat exchange pipe and the end portion of the heat exchange shell.
Furthermore, the exhaust waste heat recovery device further comprises an air inlet end cover, the air inlet end cover is sleeved on the air inlet end of the inner exhaust pipe, a second through hole for the execution component to pass through is formed in the air inlet end cover, the air inlet end cover is fixedly connected with the pipe wall of the inner exhaust pipe at the outer side edge, and the end portion of the air inlet end cover is fixedly connected with the end portion of the heat exchange pipe and the end portion of the heat exchange shell at the inner side end portion.
Furthermore, a cooling liquid inlet is further formed in one end, opposite to the cooling liquid outlet, of the heat exchange shell, and the inner exhaust pipe, the outer exhaust pipe and the heat exchange pipe are all high-temperature-resistant stainless steel thin-wall circular pipes.
The novel exhaust waste heat recovery device provided by the invention has the advantages that the outer exhaust pipe is pushed to rotate relative to the inner exhaust pipe by utilizing the expansion and contraction characteristics of paraffin, the adjustment of the coincidence rate of the first heat exchange hole and the second heat exchange hole is realized, the amount of heat exchange gas can be timely adjusted according to the temperature change of cooling liquid, the waste heat of an exhaust system is effectively utilized, the energy is saved on the premise of not consuming extra energy, the heat efficiency of an engine is improved, and the effect of self-adaptive control of the heat exchange amount is realized.
Drawings
Fig. 1 is a sectional view of the novel exhaust gas waste heat recovery device of the present embodiment;
FIG. 2 is a schematic view of the heat exchange tube and heat exchange housing of FIG. 1 with the tubes and housing removed;
FIG. 3 is a schematic view of the inner exhaust duct of FIG. 1;
FIG. 4 is a schematic view of the assembly of the outer exhaust tube and the adjustment mechanism of FIG. 1;
FIG. 5 is an enlarged sectional view taken along line B-B of FIG. 4;
FIG. 6 is a schematic view of the adjustment mechanism of FIG. 1 with the adjustment mechanism removed;
FIG. 7 is a schematic view of the high temperature tail gas and the coolant in this embodiment without heat exchange requirement;
fig. 8 is a schematic view of the high-temperature tail gas, the heat exchange gas and the cooling liquid when the heat exchange is required in the embodiment.
Description of reference numerals:
1. an inner exhaust pipe is arranged at the inner part of the exhaust pipe,
11. a first heat exchanging hole 12, a limit bump,
2. the air outlet pipe is arranged outside the air outlet pipe,
21. a second heat exchange hole 22, an installation block 23, a loop bar 24, a bulge 25 and a gap,
3. a heat exchange pipe is arranged on the upper surface of the heat exchange pipe,
3a, a first cavity, 3b, a second cavity,
4. a heat exchange shell is arranged in the shell body,
41. coolant outlet 411, first through hole 42, coolant inlet
5. An adjusting mechanism is arranged on the base plate,
51. an actuating member, 51a, a first end, 51b, a second end, 511, a straight portion, 512, a curved portion,
52. a spring is arranged on the upper surface of the shell,
53. a driving part 531, a ball 532, a push rod 533, a containing shell 534, paraffin wax,
6. an air outlet end cover is arranged on the air inlet end cover,
7. an air inlet end cover is arranged on the air inlet end cover,
71. second through hole
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and 2, an embodiment of the present invention provides a novel exhaust waste heat recovery device, which includes an inner exhaust pipe 1, an outer exhaust pipe 2, a heat exchange pipe 3, a heat exchange housing 4 and an adjusting mechanism 5, wherein in order to adjust and recover heat timely according to requirements, a plurality of first heat exchange holes 11 are formed in a pipe wall of the inner exhaust pipe 1 at intervals along a circumferential direction; the outer exhaust pipe 2 is sleeved outside the inner exhaust pipe 1 and can rotate relative to the inner exhaust pipe 1, and a plurality of second heat exchange holes which are in one-to-one correspondence with the first heat exchange holes 11 are further formed in the outer exhaust pipe 2; the heat exchange tube 3 is sleeved outside the outer exhaust tube 2, and a first cavity 3a for containing heat exchange gas is formed between the inner wall of the heat exchange tube 3 and the outer wall of the outer exhaust tube 2; the heat exchange shell 4 is sleeved outside the heat exchange tube 3, a second cavity 3b for containing cooling liquid is formed between the inner wall of the heat exchange shell 4 and the outer wall of the heat exchange tube 3, and the cooling liquid in the second cavity 3b and the heat exchange gas in the first cavity 3a perform countercurrent heat exchange; the adjusting mechanism 5 is used for adjusting the coincidence rate of the first heat exchanging hole 11 and the second heat exchanging hole 21, so that the amount of the heat exchanging gas flowing into the first cavity 3a is changed, and the heat recovery is adjusted according to the requirement.
Further, referring to fig. 1, fig. 2 and fig. 4, in this embodiment, a mounting block 22 is fixedly connected to a pipe wall of the air inlet end of the outer exhaust pipe 2, a side wall of the mounting block is fixedly connected to a sleeve rod 23, and the sleeve rod 23 extends along the circumferential direction of the pipe wall of the outer exhaust pipe 2.
As one embodiment of the adjusting mechanism, the adjusting mechanism 5 includes an actuating member 51, a spring 52 and a driving member 53, wherein the actuating member 51 is a hollow circular tube with a cross section being a space curve, a first end 51a of the actuating member 51 is sleeved on the loop bar 23, the spring 52 is disposed between a fixed end of the loop bar 23 and the first end 51a of the actuating member 51, two ends of the spring 52 are respectively fixedly connected with a sidewall of the mounting block 22 and the first end 51a of the actuating member 51, and the driving member 53 pushes the spring 52 to expand and contract through the actuating member 51 according to a temperature change of the coolant, so as to drive the outer exhaust pipe 2 to rotate relative to the inner exhaust pipe 1.
Therefore, under the action of the adjusting mechanism 5, the overlapping rate of the second heat exchanging hole 21 on the outer exhaust pipe 2 and the first heat exchanging hole 11 on the inner exhaust pipe 1 can be adjusted at proper time according to the requirement (temperature change of the cooling liquid), so that the amount of the heat exchanging gas flowing into the first cavity 3a is changed, and the self-adaptive control of the heat exchanging amount is realized.
Further, referring to fig. 1 and fig. 6, in this embodiment, a cooling liquid outlet 41 is disposed on a side of the heat exchange housing 4 close to the air inlet end of the outer exhaust pipe 2, and a first through hole 411 is disposed on a side wall of the cooling liquid outlet 41. As one embodiment of the driving member, the driving member 53 includes a plurality of balls 531, a plurality of push rods 532, and an accommodating case 533 with an opening disposed in the coolant outlet 41, the plurality of balls 531 being densely filled in the inner cavity of the actuating member 51; the inner cavity of the accommodating shell 533 is filled with the paraffin 534, and an opening of the accommodating shell 533 faces the first through hole 411 and is fixedly connected with the inner side wall of the cooling liquid outlet 41 at the opening end; one end of the push rod 532 extends into the cavity of the second end 51b of the actuating component 51 and abuts against the ball 531, and the other end of the push rod 532 extends into the first through hole 411 and abuts against the paraffin 534; the second end 51b of the actuator 51 is fixedly connected to the outer sidewall of the coolant outlet 411.
Therefore, due to the expansion and contraction characteristics of paraffin, the volume of the paraffin 534 in the driving part 53 changes along with the temperature change of the cooling liquid, and then the paraffin 534 serves as a power source to push the push rod 532 to reciprocate in the cavity of the executing part 51, so that the ball 531 is driven to move in the cavity of the executing part 51, and finally the outer exhaust pipe 2 is driven to rotate relative to the inner exhaust pipe 1 through the sleeve rod 23, so that the self-adaptive control of heat exchange is realized.
Further, referring to fig. 4, the actuating member 51 in the present embodiment includes a straight portion 511 and a curved portion 512, wherein the straight portion 511 is formed by extending the second end 51b of the actuating member 51 in a horizontal direction, the curved portion 512 is connected between the straight portion 511 and the first end 51a of the actuating member 51, and the push rod 532 reciprocates in an inner cavity of the straight portion 511. Therefore, in the embodiment, the actuating component 51 is designed into two sections, the straight portion 511 ensures that the push rod 532 can smoothly perform reciprocating linear motion in the inner cavity of the actuating component, and the curved portion 512 ensures that the actuating component 51 can wind around the outer side wall of the outer exhaust pipe 1 from the coolant outlet 41, so that the whole device is compact in structure and small in occupied space due to the reasonable shape design of the curved portion 512.
Further, referring to fig. 3 and 4, in the present embodiment, the plurality of first heat exchanging holes 11 and the plurality of second heat exchanging holes 21 are all arranged at equal intervals, so that the heat exchanging gas can uniformly flow into the first cavity 3 a; and, the first heat exchanging hole 11 and the second heat exchanging hole 21 are each provided with a plurality of sets in the axial direction, whereby more heat exchanging gas can be made to flow into the first cavity 3 a. The present embodiment is provided with four groups, but not limited to this. Through this kind of design, heat exchange efficiency has further been improved.
Further, referring to fig. 3, in this embodiment, a limiting bump 12 is disposed on an outer side of a pipe wall of an air outlet end of the inner exhaust pipe 1, and an air outlet end of the outer exhaust pipe 2 abuts against the limiting bump. The air outlet end of the outer air outlet pipe 2 is provided with a plurality of bulges 24 and gaps 25 which are distributed at intervals along the circumferential direction, and the bulges 24 are abutted against the limit lugs 12. From this, realized the axial spacing to outer blast pipe.
Further, referring to fig. 1 and 6, the exhaust waste heat recovery device in this embodiment further includes an air outlet end cover 6, the air outlet end cover 6 is sleeved on the air outlet end of the inner exhaust pipe 1, the air outlet end cover 6 is fixedly connected with the pipe wall of the inner exhaust pipe 1 at the outer side edge, and the inner side end portion is fixedly connected with the end portion of the heat exchange pipe 3 and the end portion of the heat exchange shell 4. From this, through the setting of the end cover 6 of giving vent to anger, guaranteed that interior exhaust pipe 1, heat exchange tube 3 and heat exchange housing 4 are fixed firmly in the end one side of giving vent to anger, can not take place to rotate.
Further, referring to fig. 1 and 6, the exhaust waste heat recovery device in this embodiment further includes an air inlet end cover 7, the air inlet end cover 7 is sleeved on the air inlet end of the inner exhaust pipe 1, a second through hole 71 for the execution component 2 to pass through is arranged on the air inlet end cover 7, the air inlet end cover 7 is fixedly connected with the pipe wall of the inner exhaust pipe 1 at the outer edge, and is fixedly connected with the end portion of the heat exchange pipe 3 and the end portion of the heat exchange housing 4 at the inner end portion. From this, through the setting of inlet end cover 7, guaranteed that interior exhaust pipe 1, heat exchange tube 3 and heat transfer casing 4 are fixed firmly in inlet end one side, can not take place to rotate.
Further, referring to fig. 1, in this embodiment, a cooling liquid inlet 42 is further disposed at an end of the heat exchange shell 4 opposite to the cooling liquid outlet 41, and high-temperature tail gas flows in the inner exhaust pipe 1, the outer exhaust pipe 2 and the heat exchange pipe 3, so that the inner exhaust pipe 1, the outer exhaust pipe 2 and the heat exchange pipe 3 are all made of high-temperature-resistant stainless steel thin-walled circular tubes. In this embodiment, SUS436 is selected as the material, but it is not limited thereto in other embodiments.
The assembly process of the exhaust gas waste heat recovery device in the embodiment is as follows:
(1) sleeving the outer exhaust pipe 2 on the outer side of the inner exhaust pipe 1, enabling the bulge 24 at the air outlet end of the outer exhaust pipe to abut against the limiting block 12 of the inner exhaust pipe 1, and enabling the first heat exchange hole 11 and the second heat exchange hole 21 to be staggered mutually;
(2) the spring 52 is sleeved on the loop bar 23 of the outer exhaust pipe 2, one end of the spring 52 is contacted with the mounting block 22 on the outer exhaust pipe 2, and the contact point is welded;
(3) mounting an air outlet end cover 6 at an air outlet end of the sub-assembly, and fully welding the contact area of the outer edge of the air outlet end cover 6 and the pipe wall of the inner exhaust pipe 1 in a whole circle along the circumferential direction;
(4) the heat exchange tube 3 is sleeved outside the sub-assembly, and the area of the inner side end part of the air outlet end cover 6, which is contacted with the end part of the heat exchange tube 3, is welded fully and circularly along the circumferential direction;
(5) mounting the actuating member 51 on the sub-assembly, and enabling the first end 51a of the actuating member 51 to be sleeved on the loop bar 23 and to be in contact with the other end of the spring 52, so as to weld the contact points;
(6) mounting the air inlet end cover 7 on the sub-assembly, enabling the execution component 51 to penetrate through the second through hole 71 on the air inlet end cover 7, fully welding the contact part of the execution component 51 and the second through hole 71 along the circumferential direction, fully welding the area, contacting the outer edge of the air inlet end cover 7 with the pipe wall of the inner exhaust pipe 1, of the air inlet end cover 7 along the circumferential direction, and fully welding the area, contacting the inner end part of the air inlet end cover 7 with the end part of the heat exchange pipe 3, of the air inlet end cover 7 along the circumferential direction;
(7) placing the ball 531 in the actuator 51, so that the ball 531 fills the inner cavity of the actuator 51, the ball 531 abuts against the loop bar 23 at the first end 51a of the actuator 51, a part of space is reserved at the second end 51b of the actuator 51 for placing the push rod 532, and the push rod 532 is placed in the reserved space to ensure that the push rod 532 is tightly contacted with the ball 531;
(8) filling paraffin 534 in the inner cavity of the accommodating shell 533, so that the open end of the accommodating shell 533 is attached to the first through hole 411 at the coolant outlet 41 on the heat exchange shell 4, ensuring that the center line of the accommodating shell 533 is overlapped with the center line of the first through hole 411, and fully welding the whole circle of the contact part of the open end of the accommodating shell 533 and the inner side wall of the coolant outlet 41;
(9) and (3) mounting the sub-assembly formed in the step (8) on the outer side of the sub-assembly formed in the step (7), fully welding the area where the inner side end part of the air outlet end cover 6 is contacted with the end part of the heat exchange shell 4, fully welding the area where the inner side end part of the air inlet end cover 7 is contacted with the end part of the heat exchange shell 4, aligning the second end 51b of the actuating part 51 with the first through hole 411 on the cooling liquid outlet 41, and fully welding the end part with the outer side wall of the cooling liquid outlet 41.
It should be noted that, in this embodiment, the manner of fixedly connecting the components is welding, so as to not additionally increase the fasteners and reduce the cost on the premise of ensuring the connection firmness. Of course, in other embodiments, other connection manners such as screwing, riveting and the like may also be adopted, and are not limited herein.
The working process of the exhaust gas waste heat recovery device in the embodiment is as follows:
when there is no heat exchange requirement, referring to fig. 7, the coolant with higher temperature enters the second cavity 3b through the coolant inlet 42 and flows out from the coolant outlet 41, and the flow direction of the coolant is shown as b-b in the figure; the paraffin 534 in the accommodating shell 533 is in a melting state with the cooling liquid, the push rod 532 is pushed to move rightmost, the push rod 532 pushes the ball 531 to roll in the executing component 51, so that the loop bar 23 on the outer exhaust pipe 2 is pushed, the spring 52 is in a stretching state, the outer exhaust pipe 2 rotates relative to the inner exhaust pipe 1, the first heat exchanging hole 11 on the inner exhaust pipe 1 is not overlapped with the second heat exchanging hole 21 on the outer exhaust pipe 2 completely, no tail gas flows into the first cavity 3a, and high-temperature tail gas flows along the direction a-a in the drawing.
When the temperature of the cooling liquid decreases, a heat exchange demand is generated, referring to fig. 8, and the cooling liquid with lower temperature enters the second cavity 3b through the cooling liquid inlet 42 and flows out from the cooling liquid outlet 41, and the flow direction of the cooling liquid is shown as b-b in the figure; due to the fact that the temperature of the cooling liquid is reduced, the expansion rate of the paraffin 534 is reduced, the push rod 532 is driven to move leftwards, a gap is formed between the push rod 532 and the ball 531, the outer exhaust pipe 2 rotates reversely under the restoring force action of the spring 52, the sleeve rod 23 is driven to rotate, and therefore the ball 531 is pushed to roll in the execution part 51 until the ball 531 is tightly attached to the push rod 532; due to the rotation of the outer exhaust pipe 2, the first heat exchange holes 11 and the second heat exchange holes 21 are partially overlapped, high-temperature tail gas flows along the direction a-a in the drawing, part of heat exchange gas flows into the first cavity 3a along the direction c-c, and the heat exchange gas and cooling liquid perform countercurrent heat exchange, so that the temperature of the cooling liquid is increased.
If the temperature of the cooling liquid needs to be increased continuously, the expansion rate of the paraffin 534 is reduced continuously, the push rod 532 is driven to move leftwards continuously, the outer exhaust pipe 2 continues to rotate reversely under the restoring force of the spring 52, so that the overlapping rate of the first heat exchange hole 11 and the second heat exchange hole 21 is increased, the heat exchange gas entering the first cavity 3a is increased gradually, the heat exchange amount is increased, and the temperature of the cooling liquid is further increased.
If the temperature of the cooling liquid is too high, the expansion rate of the paraffin 534 increases, the push rod 532 is pushed to move rightwards, the push rod 532 pushes the ball 531 to roll in the actuating part 51, the spring 52 is stretched, the outer exhaust pipe 2 is pushed by the ball 531 to rotate in the forward direction, the overlapping rate of the first heat exchanging hole 11 and the second heat exchanging hole 21 is reduced until the overlapping rate is zero, the heat exchanging gas entering the first cavity 3a is gradually reduced, and therefore the heat exchanging amount is reduced, and the temperature of the cooling liquid is reduced.
In conclusion, this embodiment provides a novel exhaust waste heat recovery device, utilize the expend with heat and contract with cold characteristic of paraffin to promote outer exhaling pipe rotatory for interior exhaling pipe, realize the regulation to the coincidence rate of first heat transfer hole and second heat transfer hole to can adjust the gaseous volume of heat transfer in good time according to the temperature variation of coolant liquid, effectively utilize exhaust system's waste heat, practiced thrift the energy under the prerequisite that does not consume the extra energy, improve the thermal efficiency of engine, and realized the effect of heat transfer volume adaptive control.
It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, which are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.
The foregoing is directed to the preferred embodiment of the present invention, and it is understood that various changes and modifications may be made by one skilled in the art without departing from the spirit of the invention, and it is intended that such changes and modifications be considered as within the scope of the invention.
Claims (10)
1. The utility model provides a novel exhaust waste heat recovery device which characterized in that includes:
the heat exchanger comprises an inner exhaust pipe (1), wherein the pipe wall of the inner exhaust pipe (1) is provided with a plurality of first heat exchange holes (11) which are arranged at intervals along the circumferential direction;
the outer exhaust pipe (2) is sleeved on the outer side of the inner exhaust pipe (1) and can rotate relative to the inner exhaust pipe (1), and a plurality of second heat exchange holes (21) which correspond to the first heat exchange holes (11) one by one are formed in the outer exhaust pipe (2);
the heat exchange tube (3) is sleeved on the outer side of the outer exhaust tube (2), and a first cavity (3a) for containing heat exchange gas is formed between the inner wall of the heat exchange tube (3) and the outer wall of the outer exhaust tube (2);
the heat exchange shell (4) is sleeved outside the heat exchange tube (3), a second cavity (3b) for containing cooling liquid is formed between the inner wall of the heat exchange shell (4) and the outer wall of the heat exchange tube (3), and the cooling liquid in the second cavity (3b) and the heat exchange gas in the first cavity (3a) perform countercurrent heat exchange;
the adjusting mechanism (5) is used for adjusting the coincidence rate of the first heat exchange hole (11) and the second heat exchange hole (21), and further changing the amount of the heat exchange gas flowing into the first cavity (3 a).
2. The exhaust waste heat recovery device according to claim 1, characterized in that a mounting block (22) is fixedly connected to an outer pipe wall of the air inlet end of the outer exhaust pipe (2), a side wall of the mounting block (22) is fixedly connected to a loop bar (23), and the loop bar (23) extends circumferentially along the pipe wall of the outer exhaust pipe (2);
the adjusting mechanism (5) comprises an executing component (51), a spring (52) and a driving component (53), the executing component (51) is a hollow round pipe, a first end (51a) of the executing component is sleeved on the loop bar (23), the spring (52) is arranged between the fixed end of the loop bar (23) and the first end (51a) of the executing component (51), two ends of the spring (52) are fixedly connected with the side wall of the mounting block (22) and the first end (51a) of the executing component (51) respectively, and the driving component (53) can push the spring (52) to stretch and retract according to the temperature change of cooling liquid through the executing component (51), so that the outer exhaust pipe (2) is driven to rotate relative to the inner exhaust pipe (1).
3. The exhaust waste heat recovery device according to claim 2, wherein a cooling liquid outlet (41) is formed in one side, close to the air inlet end of the outer exhaust pipe (2), of the heat exchange shell (4), and a first through hole (411) is formed in the side wall of the cooling liquid outlet (41);
the driving part (53) comprises a ball (531), a push rod (532) and a containing shell (533) which is arranged in the cooling liquid outlet (41) and is provided with an opening, the balls (531) are arranged in plurality, the balls (531) are densely filled in the inner cavity of the execution component (51), the accommodating shell (533) is filled with paraffin (534), an opening of the accommodating shell (533) is over against the first through hole (411), and is fixedly connected with the inner side wall of the cooling liquid outlet (41) at the opening end, one end of the push rod (532) extends into the cavity of the second end (51b) of the actuating component (51) and is abutted against the ball (531), the other end of the push rod (532) extends into the first through hole (411) and is abutted against the paraffin (534), the second end (51b) of the actuating component (51) is fixedly connected with the outer side wall of the cooling liquid outlet (41).
4. The exhaust gas waste heat recovery device according to claim 3, wherein the actuating member (51) includes a straight portion (511) and a curved portion (512), the straight portion (511) being formed by the second end (51b) of the actuating member (51) extending in a horizontal direction, the curved portion (512) being connected between the straight portion (511) and the first end (51a) of the actuating member (51), the push rod (532) reciprocating in an inner cavity of the straight portion (511).
5. The exhaust gas waste heat recovery device according to any one of claims 1 to 4, wherein the plurality of first heat exchange holes (11) and the plurality of second heat exchange holes (21) are arranged at equal intervals and are arranged in a plurality of groups in the axial direction.
6. The exhaust waste heat recovery device according to claim 5, characterized in that a limiting bump (12) is arranged on the outer side of the pipe wall of the air outlet end of the inner exhaust pipe (1), and the air outlet end of the outer exhaust pipe (2) abuts against the limiting bump (12).
7. The exhaust gas waste heat recovery device according to claim 6, wherein a plurality of protrusions (24) and gaps (25) are arranged at the air outlet end of the outer exhaust pipe (2) and are distributed at intervals along the circumferential direction, and the plurality of protrusions (24) are abutted to the limiting convex block (12).
8. The exhaust waste heat recovery device according to claim 5, further comprising an air outlet end cover (6), wherein the air outlet end cover (6) is sleeved on the air outlet end of the inner exhaust pipe (1), the air outlet end cover (6) is fixedly connected with the pipe wall of the inner exhaust pipe (1) at the outer edge and is fixedly connected with the end of the heat exchange pipe (3) and the end of the heat exchange shell (4) at the inner end.
9. The novel exhaust waste heat recovery device according to claim 2, further comprising an air inlet end cover (7), wherein the air inlet end cover (7) is sleeved on the air inlet end of the inner exhaust pipe (1), a second through hole (71) for the execution component (2) to pass through is formed in the air inlet end cover (7), the air inlet end cover (7) is fixedly connected with the pipe wall of the inner exhaust pipe (1) at the outer side edge, and is fixedly connected with the end portion of the heat exchange pipe (3) and the end portion of the heat exchange shell (4) at the inner side end portion.
10. The novel exhaust waste heat recovery device according to claim 3, wherein a cooling liquid inlet (42) is further formed in one end, opposite to the cooling liquid outlet (41), of the heat exchange shell (4), and the inner exhaust pipe (1), the outer exhaust pipe (2) and the heat exchange pipe (3) are all high-temperature-resistant stainless steel thin-wall round pipes.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910181385.9A CN111691954A (en) | 2019-03-11 | 2019-03-11 | Novel exhaust waste heat recovery device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910181385.9A CN111691954A (en) | 2019-03-11 | 2019-03-11 | Novel exhaust waste heat recovery device |
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| CN111691954A true CN111691954A (en) | 2020-09-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112412591A (en) * | 2020-11-20 | 2021-02-26 | 安徽充景电子科技有限公司 | Engine tail gas waste heat utilization system and waste heat utilization method thereof |
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