CN116518757B - Heat exchanger, tail gas heat recovery device of combine harvester and combine harvester - Google Patents
Heat exchanger, tail gas heat recovery device of combine harvester and combine harvester Download PDFInfo
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- CN116518757B CN116518757B CN202310357996.0A CN202310357996A CN116518757B CN 116518757 B CN116518757 B CN 116518757B CN 202310357996 A CN202310357996 A CN 202310357996A CN 116518757 B CN116518757 B CN 116518757B
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- 238000011084 recovery Methods 0.000 title claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 45
- 230000009471 action Effects 0.000 claims abstract description 6
- 239000002184 metal Substances 0.000 claims description 22
- 230000002093 peripheral effect Effects 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 4
- 239000000498 cooling water Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract description 6
- 238000000605 extraction Methods 0.000 abstract description 2
- 235000013339 cereals Nutrition 0.000 description 46
- 239000000110 cooling liquid Substances 0.000 description 11
- 238000001035 drying Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 238000001704 evaporation Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000003306 harvesting Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 244000068988 Glycine max Species 0.000 description 1
- 235000010469 Glycine max Nutrition 0.000 description 1
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005070 ripening Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention provides a heat exchanger, a tail gas heat recovery device of a combine harvester and the combine harvester, wherein the heat exchanger comprises an inner heat exchange tube, an outer heat exchange tube, a plurality of heat pipes and an elastic device. The inner heat exchange tube is formed therein with a first passage through which the gas flows. A second channel for gas or liquid to flow through is formed between the inner heat exchange tube and the outer heat exchange tube. The plurality of heat pipes are uniformly distributed along the circumferential direction of the inner heat exchange pipe, and each heat pipe is movably arranged along the radial direction of the inner heat exchange pipe. The heat pipe is used for conducting heat in the first channel into the second channel. The elastic device is used for generating a force for moving the heat pipe towards the direction of the first channel. The heat pipe moves under the combined action of the acting force of the elastic device and the acting force of the gas of the first channel. The heat exchanger, the tail gas heat recovery device of the combine harvester and the combine harvester provided by the invention can facilitate the heat extraction of the heat pipe, so that the heat conduction efficiency is higher, and the heat of the tail gas of the engine can be utilized to dry grains, thereby avoiding heat waste.
Description
Technical Field
The invention relates to the technical field of agricultural machinery drying, in particular to a heat exchanger, a tail gas heat recovery device of a combine harvester and the combine harvester.
Background
The cereal may include wheat, corn, soybean, and the like. The grains are harvested immediately after ripening, dried in the sun for dehydration and stored in a warehouse. The use of a combine provides great convenience for harvesting of grain. However, when the combine harvester works, a large amount of high-temperature tail gas can be discharged, and the tail gas is directly discharged into the environment, so that heat is wasted. On the other hand, after harvesting, the processes of airing, drying and the like need to consume a great deal of manpower and material resources. How to prevent heat waste of the combine harvester and how to solve the problem of grain drying are urgent needs to be solved at present.
Disclosure of Invention
In view of the above problems, the present invention has been made to provide a heat exchanger, a combine tail gas heat recovery device, and a combine that overcome or at least partially solve the above problems, and that can facilitate heat extraction by a heat pipe, so that heat transfer efficiency is higher, and that can efficiently utilize heat of engine tail gas to dry grains, avoiding heat waste.
Specifically, the present invention provides a heat exchanger comprising:
The inner heat exchange tube is internally provided with a first channel through which the gas flows;
The outer heat exchange tube is sleeved outside the inner heat exchange tube, and a second channel for gas or liquid to flow through is formed between the inner heat exchange tube and the outer heat exchange tube;
the heat pipes are uniformly distributed along the circumferential direction of the inner heat exchange pipe, each heat pipe is movably arranged along the radial direction of the inner heat exchange pipe, and each heat pipe penetrates through the pipe wall of the inner heat exchange pipe; the heat pipe is used for conducting heat in the first channel into the second channel;
elastic means for generating a force for moving the heat pipe in a direction toward the first passage; the heat pipe moves under the combined action of the acting force of the elastic device and the acting force of the gas of the first channel.
Optionally, the heat exchanger further comprises:
The inner cylinder is arranged at the inner side of the inner heat exchange tube, and the wall of the inner cylinder is provided with a plurality of mounting holes; the inner cylinder is made of rubber materials;
The metal sheets are movably arranged at the corresponding mounting holes and used for driving the inner cylinder to deform; one end of each heat pipe facing the first channel is connected to the metal sheet and penetrates out of the metal sheet;
one end of the elastic device is propped against the pipe wall of the inner heat exchange pipe, and the other end is propped against the metal sheet.
Optionally, the inner heat exchange tube and the outer heat exchange tube are corrugated tubes.
Optionally, the inner heat exchange tube comprises a plurality of connected first crest segments and a plurality of first trough segments; each first crest segment is alternately arranged with one first trough segment;
the outer heat exchange tube comprises a plurality of second wave peak sections and a plurality of second wave trough sections which are connected; each second crest segment is alternately arranged with one second trough segment;
at least part of the first wave crest section is arranged corresponding to the second wave crest section;
At least a portion of the first trough segments are disposed in correspondence with the second trough segments.
Optionally, the heat pipe passes through the first crest segment such that one end of the heat pipe may be interposed between two adjacent second crest segments.
Optionally, the heat exchanger further comprises a protection tube, and the protection tube is arranged on the outer side of the outer heat exchange tube;
a first inlet communicated with the second channel and used for inflow of gas or liquid is formed in the peripheral wall at one end of the protection tube, and a first outlet communicated with the second channel and used for outflow of gas or liquid is formed in the peripheral wall at the other end of the protection tube;
The protection tube, the outer heat exchange tube, the inner heat exchange tube and one end of the same side of the inner cylinder are provided with a second inlet communicated with the first channel for inflow of gas, and the protection tube, the outer heat exchange tube, the inner heat exchange tube and the other end of the same side of the inner cylinder are provided with a second outlet communicated with the first channel for outflow of gas;
The first inlet and the second outlet are positioned at the same end, and the first outlet and the second inlet are positioned at the same end.
The invention also provides a tail gas heat recovery device of a combine harvester, the combine harvester comprises an engine, an intercooler for cooling the engine and a grain conveying passage for passing grains, and the tail gas heat recovery device of the combine harvester comprises:
the heat exchanger of any one of the above, wherein an exhaust pipe of the engine is communicated with an inlet of the first channel, and a liquid outlet of the intercooler is communicated with an inlet of the second channel;
The second-stage heat exchanger comprises a second inner heat exchange tube and a second outer heat exchange tube, wherein a third channel through which gas flows is formed in the second inner heat exchange tube; the second outer heat exchange tube is sleeved outside the second inner heat exchange tube, and a fourth channel for gas or liquid to flow through is formed between the second inner heat exchange tube and the second outer heat exchange tube; the outlet of the first channel is communicated with the inlet of the third channel, and the outlet of the second channel is communicated with the inlet of the fourth channel; the outlet of the third channel is communicated with the external environment;
The three-stage heat exchanger comprises a third inner heat exchange tube and a third outer heat exchange tube, wherein a fifth channel through which gas flows is formed in the third inner heat exchange tube; the third outer heat exchange tube is sleeved outside the third inner heat exchange tube, and a sixth channel for gas or liquid to flow through is formed between the third inner heat exchange tube and the third outer heat exchange tube; the outlet of the fourth channel is communicated with the inlet of the sixth channel; the outlet of the sixth channel is communicated with a liquid return port of the intercooler; the grain delivery channel is inboard of the fifth channel.
Optionally, the inlet and outlet of the third channel are each formed by a plurality of micropores;
the third channel comprises a plurality of sub-channel segments, the cross-sectional areas of at least two of the sub-channel segments being unequal.
Optionally, the combine further comprises a turbocharger, an exhaust of which communicates with an intake of the intercooler, such that gas from the turbocharger exchanges heat with cooling water of the intercooler.
The invention also provides a combine harvester, which comprises the tail gas heat recovery device of the combine harvester.
In the heat exchanger, the tail gas heat recovery device of the combine harvester and the combine harvester, the gas in the first channel conducts heat to the gas or the liquid in the second channel through the heat pipe, when the pressure of the gas in the first channel acting on one end of the heat pipe is larger than the elastic force of the elastic device acting on the other end of the heat pipe, the heat pipe moves in the direction away from the center of the first channel, when the pressure of the gas in the first channel acting on one end of the heat pipe is smaller than the elastic force of the elastic device acting on the other end of the heat pipe, the heat pipe moves in the direction close to the center of the first channel, and the arrangement is such that one end of the heat pipe is always located at the position where the gas in the first channel gathers, namely the position where the heat of the gas is concentrated, so that the heat pipe is convenient to take heat, and the heat conduction efficiency is higher.
Further, the tail gas generated by the engine sequentially passes through the first channel of the heat exchanger and the third channel of the second-stage heat exchanger and is discharged, and the tail gas exchanges heat with the cooling liquid in the heat exchanger and the cooling liquid in the second-stage heat exchanger respectively, so that the heat of the tail gas of the engine can be more fully utilized through twice heat exchange.
Further, the cooling liquid after twice heat exchange forms high-temperature liquid and enters the sixth channel, the high-temperature liquid in the sixth channel heats the gas entering the fifth channel to form high-temperature gas so as to heat the grains passing through the grain conveying channel, and the gas in the fifth channel is used for heating the grains, so that the grains can be dried, and the grains can be stored conveniently. That is, the heat of available engine tail gas dries cereal, and on the one hand the heat of available engine tail gas prevents the waste of heat, and on the other hand also realizes the purpose to cereal drying, is favorable to the storage of cereal, and on the other hand can realize that the collection of cereal, drying integration, degree of automation is high.
The above, as well as additional objectives, advantages, and features of the present invention will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present invention when read in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:
FIG. 1 is a schematic block diagram of a heat exchanger according to one embodiment of the invention;
FIG. 2 is a schematic partial block diagram of a heat exchanger according to one embodiment of the invention;
FIG. 3 is a schematic block diagram of a combine harvester according to one embodiment of the invention;
FIG. 4 is a schematic block diagram of a secondary heat exchanger according to one embodiment of the invention;
fig. 5 is a schematic block diagram of a three stage heat exchanger in accordance with one embodiment of the present invention.
Detailed Description
Fig. 1 is a schematic structural view of a heat exchanger according to an embodiment of the present invention, as shown in fig. 1, and referring to fig. 2, an embodiment of the present invention provides a heat exchanger 100 including an inner heat exchange tube 110, an outer heat exchange tube 120, a plurality of heat pipes 130, and an elastic device 140. The inner heat exchange tube 110 has a first passage 180 formed therein through which the gas flows. The outer heat exchange tube 120 is sleeved outside the inner heat exchange tube 110, and a second channel 190 through which gas or liquid flows is formed between the inner heat exchange tube 110 and the outer heat exchange tube 120. The plurality of heat pipes 130 are uniformly distributed along the circumference of the inner heat exchange pipe 110, and each heat pipe 130 is movably disposed along the radial direction of the inner heat exchange pipe 110, and each heat pipe 130 passes through the pipe wall of the inner heat exchange pipe 110. The heat pipe 130 is used to conduct heat from within the first channel 180 to within the second channel 190. The elastic means 140 is used to generate a force that moves the heat pipe 130 in the direction of the first channel 180. The heat pipe 130 moves under the combined action of the force of the elastic means 140 and the force of the gas of the first passage 180.
In the heat exchanger 100 of the embodiment of the invention, the gas in the first channel 180 conducts heat to the gas or the liquid in the second channel 190 through the heat pipe 130, and when the pressure of the gas in the first channel 180 acting on one end of the heat pipe 130 is greater than the elastic force of the elastic device 140 acting on the other end of the heat pipe 130, the heat pipe 130 moves away from the center of the first channel 180, and when the pressure of the gas in the first channel 180 acting on one end of the heat pipe 130 is smaller than the elastic force of the elastic device 140 acting on the other end of the heat pipe 130, the heat pipe 130 moves towards the center of the first channel 180, so that one end of the heat pipe 130 is always located at the position where the gas in the first channel 180 gathers, namely the position where the heat of the gas is concentrated, so that the heat pipe 130 takes heat, and the heat conduction efficiency is higher.
The heat pipe 130 is a heat transfer element with high heat conducting performance, which transfers heat through evaporation and condensation of working medium in the fully enclosed vacuum tube shell, and has a series of advantages of extremely high heat conductivity, good isothermicity, arbitrary change of heat transfer area at both cold and hot sides, long-distance heat transfer, controllable temperature and the like. The heat pipe 130 is composed of a tube shell, a wick, and an end cap. The heat pipe 130 is internally pumped to a negative pressure state and filled with a proper liquid, which has a low boiling point and is easy to volatilize. The walls of the tube have a wick that is constructed of a capillary porous material. One end of the heat pipe 130 is an evaporation end, the other end is a condensation end, when one end of the heat pipe 130 is heated, the liquid in the capillary tube is rapidly vaporized, the vapor flows to the other end under the power of thermal diffusion, and is condensed at the cold end to release heat, and the liquid flows back to the evaporation end along the porous material by capillary action, so that the circulation is not completed until the temperatures of the two ends of the heat pipe 130 are equal. This cycle is rapid and heat is conducted continuously. In the above embodiment, the evaporating end of the heat pipe 130 is located in the first channel 180 and the condensing end of the heat pipe 130 is located in the second channel 190.
In some embodiments of the present invention, as shown in fig. 1 and 2, the heat exchanger 100 further includes an inner barrel 150 and a plurality of metal sheets 160. The inner tube 150 is disposed inside the inner heat exchange tube 110, and a plurality of mounting holes are formed in the wall of the inner tube 150. The inner cylinder 150 is made of rubber material, so that the sealing performance between the inner cylinder 150 and the metal sheet 160 is improved. Each metal sheet 160 is disposed at a corresponding mounting hole, and the metal sheets 160 are movably disposed to drive the inner cylinder 150 to deform. One end of each heat pipe 130 facing the first channel 180 is connected to the metal sheet 160 and penetrates out of the metal sheet 160. One end of the elastic device 140 is abutted against the pipe wall of the inner heat exchange pipe 110, and the other end is abutted against the metal sheet 160. For example, the elastic device 140 is a spring, and the spring is sleeved on the heat pipe 130.
In this embodiment, the metal sheet 160 moves to drive the inner cylinder 150 to deform, specifically, when the gas pressure is greater than the elastic force of the spring, the metal sheet 160 drives the inner cylinder 150 to move towards the second channel 190, i.e. the inner cylinder 150 expands, and when the gas pressure is less than the elastic force of the spring, the metal sheet 160 drives the inner cylinder 150 to move towards the first channel 180, i.e. the inner cylinder 150 collapses. The metal sheet 160 also increases the stress area, so that the heat pipe 130 can be forced to move, and the metal sheet 160 can also perform the function of heat conduction. In some embodiments, the metal sheet 160 is an elongated sheet extending along the length of the inner barrel 150, and the mounting holes are elongated holes accordingly. A plurality of heat pipes 130 may be connected to one metal sheet 160 such that the plurality of heat pipes 130 move in synchronization.
In some embodiments of the present invention, as shown in fig. 1 and 2, the inner heat exchange tube 110 and the outer heat exchange tube 120 are bellows, so that the contact area between the gas in the first channel 180 and the gas or liquid in the second channel 190 and the inner heat exchange tube 110 is larger, i.e. the heat exchange area is larger, which is beneficial for heat exchange. And the bellows can also buffer the gas or liquid flowing therethrough to prevent damage to the inner heat exchange tube 110 and the outer heat exchange tube 120 when the gas or liquid pressure is too high.
In some embodiments of the present invention, as shown in FIG. 2, the inner heat exchange tube 110 includes a plurality of first peak segments and a plurality of first valley segments connected. Each first crest segment is alternately arranged with one first trough segment. The outer heat exchange tube 120 includes a plurality of second peak segments and a plurality of second valley segments connected. Each second crest segment is alternately arranged with one second trough segment. At least part of the first wave peak section is arranged corresponding to the second wave peak section. At least a portion of the first trough segments are disposed in correspondence with the second trough segments. The arrangement is such that the cross-sectional areas of the second channels 190 are substantially equal, and the flow rate of the gas or liquid is relatively stable when flowing through the second channels 190, thereby facilitating heat exchange.
In some embodiments of the present invention, as shown in FIG. 2, the heat pipe 130 passes through a first crest segment such that one end of the heat pipe 130 may be interposed between two adjacent second crest segments. That is, a space is provided between two adjacent second trough segments for the heat pipe 130, so that when one end of the heat pipe 130 moves toward the second channel 190, the space can be entered, and the structure of the heat exchanger 100 is compact.
In some embodiments of the present invention, as shown in fig. 1 and 2, the heat exchanger 100 further includes a protection tube 170, and the protection tube 170 is disposed outside the outer heat exchange tube 120. The first inlet 171 for gas or liquid inflow is formed in the peripheral wall at one end of the protection pipe 170, and the first outlet 172 for gas or liquid outflow is formed in the peripheral wall at the other end of the protection pipe 170, which is communicated with the second channel 190. The protection tube 170, the outer heat exchange tube 120, the inner heat exchange tube 110 and one end of the inner tube 150 on the same side are formed with a second inlet 181 through which the gas flowing in through the first channel 180 flows, and the protection tube 170, the outer heat exchange tube 120, the inner heat exchange tube 110 and the other end of the inner tube 150 on the same side are formed with a second outlet 182 through which the gas flowing out through the first channel 180 flows. The first inlet 171 is located at the same end as the second outlet 182, and the first outlet 172 and the second inlet 181 are located at the same end.
In this embodiment, the flow direction of the gas in the first channel 180 is opposite to the flow direction of the gas or the liquid in the second channel 190, so that the fluid in the first channel 180 and the fluid in the second channel 190 can exchange heat more sufficiently, and the heat exchange efficiency is improved. Further, the heat exchanger 100 is vertically disposed, the first inlet 171 is at an upper end of the heat exchanger 100, the first outlet 172 is at a lower end of the heat exchanger 100, and the gas or liquid enters the second passage 190 through the first inlet 171 and is discharged from the first outlet 172. While the second inlet 181 is at the lower end of the heat exchanger 100 and the second outlet 182 is at the upper end of the heat exchanger 100, gas enters the first passage 180 through the second inlet 181 and exits from the second outlet 182.
The embodiment of the present invention also provides an exhaust heat recovery apparatus of a combine harvester 200, wherein the combine harvester 200 comprises an engine 210, an intercooler 220 for cooling the engine 210, and a grain conveying passage 270 for passing grains. The tail gas heat recovery device of the combine harvester 200 comprises the heat exchanger 100 of any of the above embodiments, the secondary heat exchanger 230 and the tertiary heat exchanger 240, the heat exchanger 100 of the above embodiments may also be referred to as a primary heat exchanger. Specifically, an exhaust pipe of the engine 210 communicates with an inlet of the first passage 180, and a drain port of the intercooler 220 communicates with an inlet of the second passage 190. The secondary heat exchanger 230 includes a second inner heat exchange tube 231 and a second outer heat exchange tube 232, and a third passage 235 through which gas flows is formed in the second inner heat exchange tube 231. The second outer heat exchange tube 232 is sleeved outside the second inner heat exchange tube 231, and a fourth channel 236 through which gas or liquid flows is formed between the second inner heat exchange tube 231 and the second outer heat exchange tube 232. The outlet of the first passage 180 communicates with the inlet of the third passage 235 and the outlet of the second passage 190 communicates with the inlet of the fourth passage 236. The outlet of the third passage 235 communicates with the external environment. The three-stage heat exchanger 240 includes a third inner heat exchange tube 241 and a third outer heat exchange tube 242, and a fifth passage 245 through which the gas flows is formed in the third inner heat exchange tube 241. The third outer heat exchange tube 242 is sleeved outside the third inner heat exchange tube 241, and a sixth channel 246 through which gas or liquid flows is formed between the third inner heat exchange tube 241 and the third outer heat exchange tube 242. The outlet of the fourth passage 236 communicates with the inlet of the sixth passage 246. The outlet of the sixth passage 246 communicates with the return port of the intercooler 220. The grain delivery passage 270 is inside the fifth passage 245. A pump 260 is also provided between the outlet of the sixth passage 246 and the return port of the intercooler 220 to return the coolant from the sixth passage 246 back into the intercooler 220.
In the tail gas heat recovery device of the combine harvester according to the embodiment of the invention, the tail gas of the engine 210 enters the first channel 180, the tail gas in the first channel 180 transmits heat to the gas or liquid in the second channel 190 through the heat pipe 130, when the pressure of the gas in the first channel 180 acting on one end of the heat pipe 130 is greater than the elastic force of the elastic device 140 acting on the other end of the heat pipe 130, the heat pipe 130 moves away from the center of the first channel 180, when the pressure of the gas in the first channel 180 acting on one end of the heat pipe 130 is smaller than the elastic force of the elastic device 140 acting on the other end of the heat pipe 130, the heat pipe 130 moves towards the direction close to the center of the first channel 180, and thus, the arrangement is such that one end of the heat pipe 130 is always located at the position where the tail gas of the first channel 180 gathers, namely the position where the heat of the tail gas is concentrated, so that the heat pipe 130 takes heat, and the heat transmission efficiency is higher.
Further, the tail gas generated by the engine 210 sequentially passes through the first channel 180 of the primary heat exchanger 100 and the third channel 235 of the secondary heat exchanger 230 and is discharged, and exchanges heat with the cooling liquid in the primary heat exchanger 100 and the cooling liquid in the secondary heat exchanger 230 respectively, so that the heat of the tail gas of the engine 210 can be more fully utilized through twice heat exchange.
Further, the cooling liquid after twice heat exchange forms a high-temperature liquid and enters the sixth channel 246, the high-temperature liquid in the sixth channel 246 heats the gas entering the fifth channel 245 to form a high-temperature gas so as to heat the grains passing through the grain conveying channel 270, and the gas in the fifth channel 245 is used for heating the grains, so that the grains can be dried, and the grains can be stored conveniently. That is, in this embodiment, the heat of the tail gas of the engine 210 is used to dry grains, so that on one hand, the heat of the tail gas of the engine 210 can be used to prevent heat waste, on the other hand, the purpose of drying grains is achieved, which is beneficial to storage of grains, on the other hand, the integration of grain collection and drying can be achieved, and the automation degree is high.
In some embodiments of the present invention, as shown in fig. 4, the second inner heat exchange tube 231 and the second outer heat exchange tube 232 are bellows. As shown in fig. 5, the third inner heat exchange tube 241 and the third outer heat exchange tube 242 are bellows.
In some embodiments of the present invention, as shown in fig. 4, the secondary heat exchanger 230 further includes a second inner tube 233 and a second protection tube 234, the second inner tube 233 being inside the second inner heat exchange tube 231, and the second protection tube 234 being outside the second outer heat exchange tube 232. A third passage 235 is formed between the second inner barrel 233 and the second inner heat exchange tube 231.
The peripheral wall at one end of the second protection pipe 234 is provided with a third inlet 2341 for gas or liquid inflow, which is communicated with the fourth channel 236, and the peripheral wall at the other end of the second protection pipe 234 is provided with a third outlet 2342 for gas or liquid outflow, which is communicated with the fourth channel 236. A fourth inlet 237 through which the gas flowing in through the third passage 235 flows is formed at one end of the same side of the second protection pipe 234, the second outer heat exchange pipe 232, the second inner heat exchange pipe 231, and the second inner cylinder 233, and a fourth outlet 238 through which the gas flowing out through the fourth passage 236 flows out is formed at the other end of the same side of the second protection pipe 234, the second outer heat exchange pipe 232, the second inner heat exchange pipe 231, and the second inner cylinder 233. The third inlet 2341 is at the same end as the fourth outlet 238, and the third outlet 2342 and the fourth inlet 237 are at the same end.
In this embodiment, the flow direction of the gas in the third channel 235 is opposite to the flow direction of the gas or the liquid in the fourth channel 236, so that the fluid in the third channel 235 and the fluid in the fourth channel 236 can exchange heat more fully, and the heat exchange efficiency is improved. Further, the secondary heat exchanger 230 is vertically disposed, the third inlet 2341 is at an upper end of the secondary heat exchanger 230, the third outlet 2342 is at a lower end of the secondary heat exchanger 230, and gas or liquid enters the fourth channel 236 through the third inlet 2341 and is discharged from the third outlet 2342. While the fourth inlet 237 is at the lower end of the secondary heat exchanger 230 and the fourth outlet 238 is at the upper end of the secondary heat exchanger 230, gas enters the third passage 235 through the fourth inlet 237 and exits from the fourth outlet 238.
In some embodiments of the present invention, as shown in fig. 5, the tertiary heat exchanger 240 further includes a third inner tube 243 and a third protection tube 244, the third inner tube 243 being inside the third inner heat exchange tube 241 and the third protection tube 244 being outside the third outer heat exchange tube 242. The inner side of the third inner cylinder 243 forms a fifth passageway 245.
A fifth inlet 2441 for gas or liquid flowing in is formed in the peripheral wall at one end of the third protection pipe 244 and is communicated with the sixth channel 246, and a fifth outlet 2442 for gas or liquid flowing out is formed in the peripheral wall at the other end of the third protection pipe 244 and is communicated with the sixth channel 246. A sixth inlet 247 for inflow of the gas communicated with the fifth passage 245 is formed in the peripheral wall at one end of the third protection pipe 244, and a sixth outlet 248 for outflow of the gas communicated with the fifth passage 245 is formed in the peripheral wall at the other end of the third protection pipe 244. A fan 249 may also be included in this embodiment, the fan 249 urging air into the fifth passage 245 through the sixth inlet 247 and out through the sixth outlet 248. One end of the same side of the third protection pipe 244, the third outer heat exchange pipe 242, the third inner heat exchange pipe 241 and the third inner cylinder 243 is formed with a grain inlet 271 for grain to enter, which communicates with the grain conveying passage 270, and the other end of the same side of the third protection pipe 244, the third outer heat exchange pipe 242, the third inner heat exchange pipe 241 and the third inner cylinder 243 is formed with a grain outlet 272 for grain to be discharged, which communicates with the grain conveying passage 270.
In some embodiments of the present invention, a condenser (not shown) is further disposed between the outlet of the sixth channel 246 and the liquid return port of the intercooler 220, and the cooling liquid from the sixth channel 246 is changed into low-temperature cooling liquid after condensation and heat dissipation of the condenser, so as to be used by the intercooler 220.
In some embodiments of the present invention, as shown in fig. 4, the inlet and outlet of the third channel 235 are each formed by a plurality of micro-holes. The third channel 235 includes a plurality of sub-channel segments, at least two of which have unequal cross-sectional areas. The gas passes through the micropores and flows through the plurality of sub-channel sections, and under the combined action of the micropores and the sub-channel sections, the energy of the gas flow is consumed, so that the noise of exhaust is reduced, and the purpose of reducing the pressure and the speed of the gas can be achieved.
In some embodiments of the invention, combine 200 further includes a turbocharger 250, with an exhaust of turbocharger 250 in communication with an intake of intercooler 220, such that the gas from turbocharger 250 exchanges heat with the cooling water of intercooler 220.
Among them, turbocharging is a technique of driving air compression using exhaust gas generated by the operation of the engine 210. The turbocharger 250 uses the exhaust gas from the engine 210 as power to drive the turbine 251 (located in the exhaust passage) in the turbine chamber, the turbine 251 drives the coaxial impeller 252 (located in the intake passage), and the impeller 252 compresses the fresh air sent from the intake duct and sends the fresh air into the cylinder. When the rotation speed of the engine 210 is increased, the exhaust gas discharge speed and the rotation speed of the turbine 251 are also increased synchronously, the air compression degree is increased, the air intake amount of the engine 210 is correspondingly increased, and the output power of the engine 210 can be increased.
However, the pressurized high-temperature air directly enters the engine 210, so that the engine 210 knocks or even is damaged and extinguished due to the fact that the air temperature is too high. Whereas the intercooler 220 serves to cool the air, the high temperature air is cooled by the intercooler 220 and then enters the engine 210.
In this embodiment, the turbocharger 250 compresses air, so that the gas at normal temperature and pressure becomes gas at high temperature and high pressure, and the intercooler 220 plays a role in cooling the gas at high temperature, and at the same time, the heat of the gas after turbocharging can be utilized. For example, the intercooler 220 in the present embodiment is a water-cooled intercooler 220. The water-cooled intercooler 220 cools air passing therethrough using circulated cooling water. The water-cooled intercooler 220 has advantages of high cooling efficiency, flexible installation location, and no need of using a long connecting line.
The present embodiment also provides a combine harvester 200, the combine harvester 200 comprising an engine 210, an intercooler 220 for cooling the engine 210 and a grain conveying passage 270 for passing grain, and the exhaust heat recovery apparatus of the combine harvester 200 of any of the above embodiments.
In the combine harvester 200 of the embodiment of the invention, the tail gas of the engine 210 enters the first channel 180, the tail gas in the first channel 180 transmits heat to the gas or liquid in the second channel 190 through the heat pipe 130, when the pressure of the gas in the first channel 180 acting on one end of the heat pipe 130 is greater than the elastic force of the elastic device 140 acting on the other end of the heat pipe 130, the heat pipe 130 moves away from the center of the first channel 180, when the pressure of the gas in the first channel 180 acting on one end of the heat pipe 130 is smaller than the elastic force of the elastic device 140 acting on the other end of the heat pipe 130, the heat pipe 130 moves towards the center of the first channel 180, and thus, the arrangement is such that one end of the heat pipe 130 is always located at the position where the tail gas of the first channel 180 gathers, namely the position where the heat of the tail gas is concentrated, so that the heat pipe 130 takes heat, and the heat transmission efficiency is higher.
Further, the tail gas generated by the engine 210 sequentially passes through the first channel 180 of the primary heat exchanger and the third channel 235 of the secondary heat exchanger 230 and is discharged, and exchanges heat with the cooling liquid in the primary heat exchanger and the cooling liquid in the secondary heat exchanger 230 respectively, so that the heat of the tail gas of the engine 210 can be more fully utilized through twice heat exchange.
Further, the cooling liquid after twice heat exchange forms a high-temperature liquid and enters the sixth channel 246, the high-temperature liquid in the sixth channel 246 heats the gas entering the fifth channel 245 to form a high-temperature gas so as to heat the grains passing through the grain conveying channel 270, and the gas in the fifth channel 245 is used for heating the grains, so that the grains can be dried, and the grains can be stored conveniently. That is, in this embodiment, the heat of the tail gas of the engine 210 is used to dry grains, so that on one hand, the heat of the tail gas of the engine 210 can be used to prevent heat waste, on the other hand, the purpose of drying grains is achieved, which is beneficial to storage of grains, on the other hand, the integration of grain collection and drying can be achieved, and the automation degree is high.
By now it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described herein in detail, many other variations or modifications of the invention consistent with the principles of the invention may be directly ascertained or inferred from the present disclosure without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.
Claims (9)
1.A heat exchanger, comprising:
The inner heat exchange tube is internally provided with a first channel through which the gas flows;
The outer heat exchange tube is sleeved outside the inner heat exchange tube, and a second channel for gas or liquid to flow through is formed between the inner heat exchange tube and the outer heat exchange tube;
the heat pipes are uniformly distributed along the circumferential direction of the inner heat exchange pipe, each heat pipe is movably arranged along the radial direction of the inner heat exchange pipe, and each heat pipe penetrates through the pipe wall of the inner heat exchange pipe; the heat pipe is used for conducting heat in the first channel into the second channel;
Elastic means for generating a force for moving the heat pipe in a direction toward the first passage; the heat pipe moves under the combined action of the acting force of the elastic device and the acting force of the gas of the first channel;
The inner cylinder is arranged at the inner side of the inner heat exchange tube, and the wall of the inner cylinder is provided with a plurality of mounting holes; the inner cylinder is made of rubber materials;
Each metal sheet is arranged at a corresponding mounting hole and is movably arranged to drive the inner cylinder to deform; one end of each heat pipe facing the first channel is connected to the metal sheet and penetrates out of the metal sheet;
one end of the elastic device is propped against the pipe wall of the inner heat exchange pipe, and the other end is propped against the metal sheet.
2. A heat exchanger according to claim 1 wherein,
The inner heat exchange tube and the outer heat exchange tube are corrugated tubes.
3. A heat exchanger according to claim 2 wherein,
The inner heat exchange tube comprises a plurality of first wave peak sections and a plurality of first wave trough sections which are connected; each first crest segment is alternately arranged with one first trough segment;
the outer heat exchange tube comprises a plurality of second wave peak sections and a plurality of second wave trough sections which are connected; each second crest segment is alternately arranged with one second trough segment;
at least part of the first wave crest section is arranged corresponding to the second wave crest section;
At least a portion of the first trough segments are disposed in correspondence with the second trough segments.
4. A heat exchanger according to claim 3 wherein,
The heat pipe passes through the first wave crest section so that one end of the heat pipe can be inserted between two adjacent second wave trough sections.
5. The heat exchanger of claim 1, further comprising a protective tube disposed outside the outer heat exchange tube;
a first inlet communicated with the second channel and used for inflow of gas or liquid is formed in the peripheral wall at one end of the protection tube, and a first outlet communicated with the second channel and used for outflow of gas or liquid is formed in the peripheral wall at the other end of the protection tube;
The protection tube, the outer heat exchange tube, the inner heat exchange tube and one end of the same side of the inner cylinder are provided with a second inlet communicated with the first channel for inflow of gas, and the protection tube, the outer heat exchange tube, the inner heat exchange tube and the other end of the same side of the inner cylinder are provided with a second outlet communicated with the first channel for outflow of gas;
The first inlet and the second outlet are positioned at the same end, and the first outlet and the second inlet are positioned at the same end.
6. A combine tail gas heat recovery device, the combine comprising an engine, an intercooler for cooling the engine, and a grain delivery passage for passing grains, the combine tail gas heat recovery device comprising:
The heat exchanger of any one of claims 1 to 5, an exhaust pipe of the engine being in communication with an inlet of the first passage, a drain of the intercooler being in communication with an inlet of the second passage;
The second-stage heat exchanger comprises a second inner heat exchange tube and a second outer heat exchange tube, wherein a third channel through which gas flows is formed in the second inner heat exchange tube; the second outer heat exchange tube is sleeved outside the second inner heat exchange tube, and a fourth channel for gas or liquid to flow through is formed between the second inner heat exchange tube and the second outer heat exchange tube; the outlet of the first channel is communicated with the inlet of the third channel, and the outlet of the second channel is communicated with the inlet of the fourth channel; the outlet of the third channel is communicated with the external environment;
The three-stage heat exchanger comprises a third inner heat exchange tube and a third outer heat exchange tube, wherein a fifth channel through which gas flows is formed in the third inner heat exchange tube; the third outer heat exchange tube is sleeved outside the third inner heat exchange tube, and a sixth channel for gas or liquid to flow through is formed between the third inner heat exchange tube and the third outer heat exchange tube; the outlet of the fourth channel is communicated with the inlet of the sixth channel; the outlet of the sixth channel is communicated with a liquid return port of the intercooler; the grain delivery channel is inboard of the fifth channel.
7. The tail gas heat recovery device of a combine harvester according to claim 6, wherein,
The inlet and the outlet of the third channel are formed by a plurality of micropores;
the third channel comprises a plurality of sub-channel segments, the cross-sectional areas of at least two of the sub-channel segments being unequal.
8. The combine tail gas heat recovery device of claim 6, further comprising a turbocharger having an exhaust in communication with an intake of the intercooler to exchange heat of gas from the turbocharger with cooling water of the intercooler.
9. A combine harvester, characterized by comprising a combine harvester exhaust heat recovery apparatus as claimed in any one of claims 6 to 8.
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| CN202310357996.0A CN116518757B (en) | 2023-04-06 | 2023-04-06 | Heat exchanger, tail gas heat recovery device of combine harvester and combine harvester |
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| CN202310357996.0A CN116518757B (en) | 2023-04-06 | 2023-04-06 | Heat exchanger, tail gas heat recovery device of combine harvester and combine harvester |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013155930A (en) * | 2012-01-30 | 2013-08-15 | Kubota Corp | Heat exchanger and grain dryer using the same |
| CN104233733A (en) * | 2013-06-20 | 2014-12-24 | Lg电子株式会社 | Dryer with a waste heat recovery means |
| CN109827409A (en) * | 2017-11-23 | 2019-05-31 | 孟州市远弘干燥设备研发有限公司 | The band drier of conduction heating type |
| CN111197928A (en) * | 2020-02-26 | 2020-05-26 | 宝莲华七彩新能源(江苏)有限公司 | Grain drying system based on multi-fluid heat pipe |
| CN114892366A (en) * | 2022-06-15 | 2022-08-12 | 绍兴永风节能科技有限公司 | High-efficient waste heat recovery forming machine |
| CN115265133A (en) * | 2022-09-21 | 2022-11-01 | 江苏辰安泰生物医药研究院有限公司 | Efficient environment-friendly bio-based material drying equipment and drying method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9315280B2 (en) * | 2012-11-20 | 2016-04-19 | Lockheed Martin Corporation | Heat pipe with axial wick |
-
2023
- 2023-04-06 CN CN202310357996.0A patent/CN116518757B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013155930A (en) * | 2012-01-30 | 2013-08-15 | Kubota Corp | Heat exchanger and grain dryer using the same |
| CN104233733A (en) * | 2013-06-20 | 2014-12-24 | Lg电子株式会社 | Dryer with a waste heat recovery means |
| CN109827409A (en) * | 2017-11-23 | 2019-05-31 | 孟州市远弘干燥设备研发有限公司 | The band drier of conduction heating type |
| CN111197928A (en) * | 2020-02-26 | 2020-05-26 | 宝莲华七彩新能源(江苏)有限公司 | Grain drying system based on multi-fluid heat pipe |
| CN114892366A (en) * | 2022-06-15 | 2022-08-12 | 绍兴永风节能科技有限公司 | High-efficient waste heat recovery forming machine |
| CN115265133A (en) * | 2022-09-21 | 2022-11-01 | 江苏辰安泰生物医药研究院有限公司 | Efficient environment-friendly bio-based material drying equipment and drying method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 联合收割机排气余热回收用热管换热器结构参数优化;王明杰等;中国农机化学报;20200715;第41卷(第7期);164-169 * |
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