CN218062430U - Heat exchange respiratory tube assembly of engine and engine with same - Google Patents
Heat exchange respiratory tube assembly of engine and engine with same Download PDFInfo
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- CN218062430U CN218062430U CN202221835985.6U CN202221835985U CN218062430U CN 218062430 U CN218062430 U CN 218062430U CN 202221835985 U CN202221835985 U CN 202221835985U CN 218062430 U CN218062430 U CN 218062430U
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- 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
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- Y02T10/12—Improving ICE efficiencies
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Abstract
The utility model discloses a heat exchange respiratory tube assembly of engine and have its engine, heat exchange respiratory tube assembly include the exhaust gas recirculation pipeline, the import of exhaust gas recirculation pipeline and the exhaust pipe intercommunication of engine, the export of exhaust gas recirculation pipeline and the intake manifold intercommunication of engine, the inside of exhaust gas recirculation pipeline has circulation exhaust passage. The engine exhaust gas recirculation system is characterized by further comprising a heat exchange breathing pipe, the heat exchange breathing pipe is sleeved outside the exhaust gas recirculation pipeline, a crank gas channel is formed between the inner wall surface of the heat exchange breathing pipe and the outer wall surface of the exhaust gas recirculation pipeline, the inlet of the crank gas channel is communicated with an oil-gas separator of the engine, and the outlet of the crank gas channel is communicated with an upstream air inlet pipeline of the throttle valve. The heat exchange breather pipe is located at the part of the exhaust gas recirculation pipeline immediately upstream of the outlet and extends along the length direction of the exhaust gas recirculation pipeline. The gas temperature in the crank gas channel is heated by the circulating waste gas with higher temperature so as to prevent the breathing tube from icing.
Description
Technical Field
The utility model relates to an engine field, in particular to heat exchange respiratory tube assembly of engine and have its engine.
Background
When the engine works, a part of combustible mixture and waste gas in the combustion chamber are blown into a crankcase through piston rings, the crankcase gas contains a large amount of oil gas, the part of gas can cause air pollution if being discharged into the atmosphere, and the part of gas is not allowed to be directly discharged into the atmosphere according to emission regulations, and is required to be introduced into the combustion chamber through an air inlet system for combustion and then is discharged. In addition, the crankcase gas contains a large amount of oil, which, if introduced directly into the combustion chamber for combustion, results in an excessively rapid consumption of oil on the one hand and damage to engine components on the other hand.
In order to avoid the above problems, the engine needs to be provided with a closed crankcase ventilation system. Closed crankcase ventilation systems are typically split into two paths leading into the intake system, a full load path and a partial load path. A full-load circuit is usually arranged in front of the throttle or compressor, which is generally in communication with an intake hose, i.e. a breathing tube, which is generally arranged outside the body, the intake of which communicates with the crankcase for exhausting the gases present in the crankcase, and the outlet of which communicates with the intake. When the engine runs for a long time at a high speed in a low-temperature environment, water vapor in crankcase gas can freeze at the outlet of the breathing tube to block the passage, so that the bent pressure of the engine rises to damage parts such as an engine oil seal and the like. Most anti-icing breathing tubes in the prior art are relatively complex, for example, chinese patent documents with publication numbers CN210460871U and CN113404626A have complex anti-icing structures or heating devices, so that an anti-icing breathing tube with a simple structure needs to be invented to keep the channel capable of normal ventilation.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problem that the respiratory tube in the prior art freezes easily at the kneck.
For solving the technical problem, the utility model discloses an embodiment discloses a heat exchange respiratory tube assembly of engine, including the exhaust gas recirculation pipeline, the import of exhaust gas recirculation pipeline and the exhaust pipe intercommunication of engine, the export of exhaust gas recirculation pipeline and the intake manifold intercommunication of engine, the inside of exhaust gas recirculation pipeline has circulation exhaust passage.
The exhaust gas recirculation system is characterized by also comprising a heat exchange breathing pipe, wherein the heat exchange breathing pipe is sleeved outside the exhaust gas recirculation pipeline, a crank gas channel is formed between the inner wall surface of the heat exchange breathing pipe and the outer wall surface of the exhaust gas recirculation pipeline, the inlet of the crank gas channel is communicated with an oil-gas separator of the engine, and the outlet of the crank gas channel is communicated with an upstream air inlet pipeline of the throttle valve; wherein the heat-exchange breathing pipe is located at the part immediately upstream of the outlet of the exhaust gas recirculation pipeline and extends along the length direction of the exhaust gas recirculation pipeline.
By adopting the technical scheme, the heat exchange breathing pipe is sleeved outside the waste gas recirculation pipeline, a curved gas channel is formed between the inner wall surface of the heat exchange breathing pipe and the outer wall surface of the waste gas recirculation pipeline, and the temperature of the circulating waste gas in the waste gas recirculation pipeline is higher, so that the waste gas in the waste gas recirculation pipeline can improve the temperature of the air flow in the curved gas channel, the breathing pipe is prevented from being frozen and blocked in the low-temperature environment by the water vapor in the gas discharged from the crankcase, and the smoothness of the breathing pipe is kept.
Furthermore, the heat exchange breathing pipe is sleeved outside the exhaust gas recirculation pipeline, and when the circulating exhaust gas heats the airflow in the crank gas channel, the circulating exhaust gas with high temperature and needing heat dissipation is cooled by the heat exchange principle, so that the air inlet temperature and the detonation tendency of the circulating exhaust gas are reduced. Thereby further improving the thermal efficiency of the engine. And the heat exchange breather pipe extends along exhaust gas recirculation pipeline's length direction and sets up, can improve the heat exchange efficiency between exhaust gas recirculation pipeline and the heat exchange breather pipe.
Further, the utility model discloses in establish heat exchange breathing pipe cover outside the exhaust gas recirculation pipeline, compare with the scheme of the solitary breathing pipe that the tradition set up, the structure is simpler, and the volume is littleer, can enough make the functional module of engine integrate more, also avoids additionally adding the heat preservation layer and adopting anti-icing measures such as electrical heating and water heating simultaneously to reduce the cost of part.
The utility model discloses an embodiment has still disclosed the heat exchange respiratory tube assembly of an engine, and the heat exchange respiratory tube is including sealed hot exchange pipe, intake pipe and the outlet duct that meets. The air inlet pipe is arranged at the inlet of the curved gas channel in a protruding mode, and the air outlet pipe is arranged at the outlet of the curved gas channel in a protruding mode. And two ends of the air inlet pipe are respectively communicated with the oil-gas separator and the heat exchange pipe, and two ends of the air outlet pipe are respectively communicated with the air inlet pipeline and the heat exchange pipe.
By adopting the technical scheme, the air inlet pipe is communicated with the oil-gas separator in the crankcase, the air outlet pipe is communicated with the air inlet pipeline of the engine, the structure is simple, the connection is convenient, the gas in the crankcase flows into the air inlet pipeline of the engine from the air inlet pipe, the heat exchange pipe and the air outlet pipe in sequence, and the low-temperature icing is prevented by heating the waste gas in the waste gas recirculation pipeline.
The utility model discloses an embodiment also discloses a heat exchange respiratory tube assembly of engine, and hot exchange pipe's diameter is greater than the diameter of exhaust gas recirculation pipe.
By adopting the technical scheme, the diameter of the heat exchange tube is larger than that of the waste gas recirculation tube, so that the heat exchange tube can be ensured to be sleeved on the waste gas recirculation tube.
The utility model discloses an embodiment has still disclosed the heat exchange respiratory tube assembly of engine, in hot exchange pipe and exhaust gas recirculation pipe along axial direction's cross-section, the curved gas passage between hot exchange pipe's internal face and the outer wall of exhaust gas recirculation pipe is the annular shape, and its ring width size is within the range of 10mm ~ 20 mm.
By adopting the technical scheme, the annular curved gas channel is formed between the inner wall surface of the heat exchange tube and the outer wall surface of the waste gas recirculation tube, so that the heat exchange efficiency between the air flow in the curved gas channel and the outer wall surface of the waste gas recirculation tube can be improved, and the heating rate of the air flow in the curved gas channel of the waste gas and the cooling rate of the circulating waste gas are improved.
The utility model discloses an embodiment still discloses a heat exchange respiratory tube assembly of engine, and the intake pipe all is "T" shape structure with hot exchange pipe's the position of being connected and the position of being connected of outlet duct and hot exchange pipe. One end part of the heat exchange tube close to the air inlet tube is in interference fit with the outer wall surface of the waste gas recirculation tube, and one end part of the heat exchange tube close to the air outlet tube is in interference fit with the outer wall surface of the waste gas recirculation tube.
By adopting the technical scheme, the air tightness of the heat exchange tube can be improved, and the gas in the heat exchange tube is prevented from leaking through one end part of the heat exchange tube close to the air inlet tube or one end part of the heat exchange tube close to the air outlet tube.
The utility model discloses an embodiment has still disclosed the heat exchange respiratory tube assembly of an engine, is provided with two joint grooves on the outer wall of exhaust gas recirculation pipe, and two joint groove spaced distances are the same with hot exchange pipe's length, and wherein every joint groove all encircles the setting along exhaust gas recirculation pipe's radial outer wall. The two end parts of the heat exchange pipe are provided with clamping rings matched with the clamping grooves, and the clamping rings are fixedly clamped in the clamping grooves.
By adopting the technical scheme, after the clamping rings at the two end parts of the heat exchange pipe are sleeved in the clamping grooves, the connecting structure is more stable, and the air tightness can be ensured.
The utility model discloses an embodiment has still disclosed the heat exchange respiratory tube assembly of an engine, through welded mode fixed connection between the outer wall of hot both ends of heat exchange pipe and waste gas recirculation pipe.
By adopting the technical scheme, when the heat exchange tube and the waste gas recirculation tube are both arranged as metal pipelines, the heat exchange tube and the waste gas recirculation tube are connected in a welding mode, so that high connection strength is provided, and the connection stability and the sealing performance of the heat exchange tube are also improved.
The utility model discloses an embodiment still discloses a heat exchange respiratory tube assembly of engine, and hot exchange pipe sets up to the flexible tube to still be provided with the heat preservation on hot exchange pipe's the outer wall.
By adopting the technical scheme, when the heat exchange pipe is arranged to be a flexible pipe, the heat exchange pipe can be adaptively adjusted according to the arrangement mode and the trend of the waste gas recirculation pipe, and the heat insulation layer is arranged on the outer wall surface of the heat exchange pipe, so that the heat insulation effect of the heat exchange pipe can be improved.
The utility model discloses an embodiment still discloses an engine, including the engine organism, the engine organism has air inlet pipeline and exhaust pipe, and fresh air is carried through air intake manifold and engine organism intercommunication and to the engine organism to the air inlet pipeline, and exhaust pipe is used for the exhaust gas after the exhaust engine burning, still includes the heat exchange respiratory tube assembly of above-mentioned arbitrary one.
The inlet of the exhaust gas recirculation pipeline is communicated with the exhaust pipeline, an exhaust gas recirculation cooler and an exhaust gas recirculation valve are further arranged on the exhaust gas recirculation pipeline and located at the upstream of the heat exchange breathing pipe, and the outlet of the exhaust gas recirculation pipeline is communicated with an air inlet manifold on the engine. The air inlet pipeline also comprises a throttle valve and an air filter which are arranged on the upstream of the air inlet manifold in sequence, and the outlet of the crank gas channel is communicated with the air inlet pipeline between the throttle valve and the air filter.
By adopting the technical scheme, the heat exchange breathing pipe is sleeved on part of the outer wall surface of the exhaust gas recirculation pipeline of the engine, the circulating exhaust gas in the exhaust gas recirculation pipeline exchanges heat with the gas in the heat exchange breathing pipe, and the inlet temperature of the circulating exhaust gas in the exhaust gas recirculation pipeline is reduced and the knocking tendency is reduced. The gas temperature in the heat exchange breathing pipe is further heated to the temperature of joint department is higher than the temperature of icing when making the gaseous clean air pipe that gets into air intake system in the heat exchange breathing pipe, avoids freezing at the heat exchange breathing pipe and with the inner wall of clean air intake pipe's joint department, in order to block up the heat exchange breathing pipe. And the heat exchange respiratory tube is sleeved outside the exhaust gas recirculation pipeline, the structure is simpler, the volume is smaller, the integration degree is higher, and an additional antipyretic device is not required to be arranged.
The utility model has the advantages that:
the utility model discloses a heat exchange respiratory tube assembly of engine and have its engine, heat exchange respiratory tube cover in the heat exchange respiratory tube assembly is established outside exhaust gas recirculation pipeline, and be formed with the curved gas passage between the internal face of heat exchange respiratory tube and exhaust gas recirculation pipeline's outer wall, can utilize the heat dissipation capacity of engine self effectively, the frozen problem of respiratory tube low temperature has been solved effectively, also cool off high temperature needs radiating gas simultaneously, reduce inlet air temperature and detonation tendency, make the effective thermal efficiency of engine further improve, the functional module that can make the engine integrates more again, also avoid additionally simultaneously to add the heat preservation and adopt anti-icing measures such as electrical heating and water heating, thereby reduce the cost of part.
Drawings
Fig. 1 is a schematic view of an overall structure of a heat exchange breathing tube assembly of an engine according to embodiment 1 of the present invention;
fig. 2 is a schematic structural view of an intake pipe of a heat exchange respiratory tube assembly of an engine according to embodiment 1 of the present invention;
fig. 3 is a schematic view showing the operation of the exhaust gas recirculation pipe and the heat exchange respiratory pipe according to embodiments 1 and 2 of the present invention.
Description of reference numerals:
100. an engine;
110. an intake manifold; 120. an oil-gas separator;
200. an exhaust line;
210. a catalyst; 220. a muffler;
300. an exhaust gas recirculation line;
310. an exhaust gas recirculation cooler; 320. an exhaust gas recirculation valve;
400. a heat exchange breathing tube;
410. a gas channel is communicated; 420. a heat exchange tube; 430. an air inlet pipe; 440. an air outlet pipe;
500. an air intake line;
510. a throttle valve; 520. an air filter.
Detailed Description
The following description is given for illustrative embodiments of the invention, and other advantages and effects of the invention will be apparent to those skilled in the art from the disclosure of the present invention. While the invention will be described in conjunction with the preferred embodiments, it is not intended to limit the features of the invention to that embodiment. On the contrary, the intention of implementing the novel features described in connection with the embodiments is to cover other alternatives or modifications which may be extended based on the claims of the present invention. In the following description, numerous specific details are included to provide a thorough understanding of the invention. The invention may be practiced without these particulars. Furthermore, some of the specific details are omitted from the description so as not to obscure or obscure the present invention. It should be noted that, in the case of no conflict, the embodiments and features of the embodiments of the present invention may be combined with each other.
It should be noted that in this specification, like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.
In the description of the present embodiment, it should be noted that the terms "first", "second", and the like are used only for distinguishing the description, and are not construed as indicating or implying relative importance.
In the description of the present embodiment, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected," and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the present embodiment can be understood as specific cases by those of ordinary skill in the art.
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Example 1
As a preferred embodiment of the present invention, the embodiment of the present invention discloses a heat exchange breathing tube assembly of an engine, as shown in fig. 1 and 3, comprising an exhaust gas recirculation pipeline 300, wherein an inlet of the exhaust gas recirculation pipeline 300 is communicated with an exhaust pipeline 200 of the engine 100, an outlet of the exhaust gas recirculation pipeline 300 is communicated with an intake manifold 110 of the engine 100, and a circulating exhaust gas channel is arranged inside the exhaust gas recirculation pipeline 300.
The exhaust gas recirculation system further comprises a heat exchange breathing pipe 400, the heat exchange breathing pipe 400 is sleeved outside the exhaust gas recirculation pipeline 300, a curved gas channel 410 is formed between the inner wall surface of the heat exchange breathing pipe 400 and the outer wall surface of the exhaust gas recirculation pipeline 300, the inlet of the curved gas channel 410 is communicated with the oil-gas separator 120 of the engine 100, and the outlet of the curved gas channel 410 is communicated with the upstream air inlet pipeline 500 of the throttle valve 510. Wherein the heat-exchange breathing tube 400 is located at a portion of the exhaust gas recirculation line 300 immediately upstream of the outlet thereof, extending along the length of the exhaust gas recirculation line 300.
Specifically, in this embodiment, the heat-exchanging breathing tube 400 is sleeved outside the exhaust gas recirculation pipeline 300, and a curved gas passage 410 is formed between the inner wall surface of the heat-exchanging breathing tube 400 and the outer wall surface of the exhaust gas recirculation pipeline 300, because the temperature of the circulating exhaust gas in the exhaust gas recirculation pipeline 300 is high, the temperature of the air flow in the curved gas passage 410 can be increased by the exhaust gas in the exhaust gas recirculation pipeline 300, the moisture in the gas discharged from the crankcase is prevented from freezing and blocking the breathing tube in a low-temperature environment, and the breathing tube is kept smooth.
More specifically, in the present embodiment, as shown in fig. 1 and 3, the outlet of the crank gas passage 410 communicates with the upstream intake pipe 500 of the throttle valve 510, and the heat-exchange breathing tube 400 is located at the portion immediately upstream of the outlet of the exhaust gas recirculation pipe 300, which means: the heat exchange breather pipe 400 is located in a portion of the exhaust gas recirculation pipe 300 from a position near the outlet to a position near the upstream of the exhaust gas recirculation pipe 300, and the length of the portion of the pipe may be adjusted or designed by those skilled in the art according to actual requirements, for example, the heat exchange breather pipe 400 is sleeved on the exhaust gas recirculation pipe 300, and the length of the exhaust gas recirculation pipe 300 is one half of the length of the exhaust gas recirculation pipe 300, or two thirds of the length of the exhaust gas recirculation pipe 300 and extends to the upstream of the exhaust gas recirculation pipe 300, or one third of the length of the exhaust gas recirculation pipe 300 to a position near the upstream of the exhaust gas recirculation pipe 300, which is not specifically limited in this embodiment.
In the present embodiment, the upstream refers to a position closer to the airflow inlet in the flow path of the airflow when the airflow circulates in the pipeline in the work cycle system of the engine 100.
More specifically, in this embodiment, the heat exchange breathing tube 400 is sleeved outside the exhaust gas recirculation pipeline 300, and when the circulating exhaust gas heats the air flow in the crank gas channel 410, the circulating exhaust gas with high temperature and required heat dissipation is cooled by the heat exchange principle, so as to reduce the inlet temperature and the knocking tendency of the circulating exhaust gas. Thereby enabling the thermal efficiency of engine 100 to be further improved. And heat exchange breathing pipe 400 extends along the length direction of exhaust gas recirculation pipeline 300 and sets up, can improve the heat exchange efficiency between exhaust gas recirculation pipeline 300 and heat exchange breathing pipe 400.
More specifically, in this embodiment the utility model discloses in establish heat exchange breathing pipe 400 cover outside exhaust gas recirculation pipeline 300, compare with the scheme of the solitary breathing pipe that the tradition set up, the structure is simpler, and the volume is littleer, can enough make engine 100's functional module integrate more, also avoids additionally simultaneously adding the heat preservation and adopt anti-icing measures such as electrical heating and water heating to reduce the cost of part.
The embodiment of the present invention further discloses a heat-exchange breathing tube assembly of an engine, as shown in fig. 1, the heat-exchange breathing tube 400 includes a heat-exchange tube 420, an air inlet tube 430 and an air outlet tube 440, which are hermetically connected. An inlet pipe 430 is protrusively provided at an inlet of the crank gas passage 410, and an outlet pipe 440 is protrusively provided at an outlet of the crank gas passage 410. And both ends of the air inlet pipe 430 are respectively communicated with the oil-gas separator 120 and the heat exchange pipe 420, and both ends of the air outlet pipe 440 are respectively communicated with the air inlet duct 500 and the heat exchange pipe 420.
Specifically, in the present embodiment, the air inlet pipe 430 and the air outlet pipe 440 protrude from the curved gas passage 410, which not only can perform a better flow guiding function, but also can be respectively connected to the oil-gas separator 120 and the air inlet pipeline 500 through the protruding air inlet pipe 430 and the protruding air outlet pipe 440. For example, a screw, a flange, a gasket, etc. may be provided at the joint portion of the inlet pipe 430 and the outlet pipe 440 to improve airtightness.
More specifically, in the present embodiment, the inlet pipe 430 is configured to communicate with the gas-oil separator 120 in the crankcase, the outlet pipe 440 is configured to communicate with the inlet pipeline 500 of the engine 100, the structure is simple, the connection is convenient, and the gas in the crankcase flows into the inlet pipeline 500 of the engine 100 from the inlet pipe 430, the heat exchange pipe 420 and the outlet pipe 440 in sequence, and is heated by the exhaust gas in the exhaust gas recirculation pipeline 300, so as to prevent low-temperature icing.
Embodiments of the present invention also disclose an engine heat exchange breathing tube assembly in which the heat exchange tube 420 has a diameter greater than the exhaust gas recirculation tube. It should be noted that, in the present embodiment, the exhaust gas recirculation line 300 includes an exhaust gas recirculation line, which refers to a pipe structure, and the exhaust gas recirculation line 300 is a pipe passage formed by the exhaust gas recirculation pipe.
Specifically, in the present embodiment, the diameter of the heat exchange tube 420 is larger than that of the exhaust gas recirculation tube, so that the heat exchange tube 420 can be securely fitted around the exhaust gas recirculation tube, and the meandering gas channel 410 is formed between the inner wall surface of the heat exchange tube 420 and the outer wall surface of the exhaust gas recirculation tube.
Further, the diameter of the heat exchange pipe 420 may be 20mm, 30mm, 40mm, 50mm or other size larger than the diameter of the exhaust gas recirculation pipe, which is not particularly limited in this embodiment.
In the embodiment of the present invention, further disclosing a heat exchange breathing tube assembly of an engine, as shown in fig. 2, in a cross section of the heat exchange tube 420 and the exhaust gas recirculation tube in the axial direction, the curved gas passage 410 between the inner wall surface of the heat exchange tube 420 and the outer wall surface of the exhaust gas recirculation tube is in the shape of a circular ring, and the ring width dimension thereof is in the range of 10mm to 20 mm.
Specifically, in the present embodiment, the annular crank gas channel 410 is formed between the inner wall surface of the heat exchange tube 420 and the outer wall surface of the exhaust gas recirculation tube, so that the heat exchange efficiency between the gas flow in the crank gas channel 410 and the outer wall surface of the exhaust gas recirculation tube can be improved, that is, the temperature increase rate of the gas flow in the crank gas channel 410 of the exhaust gas and the temperature decrease rate of the circulated exhaust gas can be improved. And its loop width dimension may be 10mm, 13mm, 15mm, 20mm or other dimensions.
The embodiment of the present invention further discloses a heat exchange breathing tube assembly of an engine, as shown in fig. 1 and fig. 2, a connection portion of the air inlet tube 430 and the heat exchange tube 420, and a connection portion of the air outlet tube 440 and the heat exchange tube 420 are both in a "T" shape structure. One end of the heat exchange tube 420 near the inlet tube 430 is in interference fit with the outer wall of the exhaust gas recirculation tube, and one end of the heat exchange tube 420 near the outlet tube 440 is in interference fit with the outer wall of the exhaust gas recirculation tube.
Specifically, in this embodiment, the pipelines are connected by interference fit, so that the air tightness of the heat exchange tube 420 can be improved, and the gas in the heat exchange tube 420 is prevented from leaking through one end of the heat exchange tube 420 close to the air inlet pipe 430 or one end of the heat exchange tube 420 close to the air outlet pipe 440.
The embodiment of the present invention also discloses a heat exchange respiratory tube assembly of an engine, wherein the outer wall surface of the exhaust gas recirculation tube is provided with two clamping grooves (not shown in the figure), the spacing distance between the two clamping grooves is the same as the length of the heat exchange tube 420, and each clamping groove is arranged around the radial outer wall surface of the exhaust gas recirculation tube. The heat exchanger tubes 420 are provided at both ends thereof with snap rings (not shown) fitted in the snap grooves, and the snap rings are fixedly snapped in the snap grooves. And a sealant or gasket (not shown) is provided between both end portions of the heat exchange pipe 420 and the outer wall surface of the exhaust gas recirculation pipe. After the clamping rings at the two end parts of the heat exchange tube 420 are sleeved in the clamping grooves, the connection structure is more stable, and the air tightness can be ensured. And a sealant or gasket is provided between both end portions of the heat exchange tube 420 and the outer wall surface of the exhaust gas recirculation tube to further improve the connection stability and the sealing property of the heat exchange tube 420.
For example, when the length of the heat exchange tube 420 is 200mm, the distance between the two clamping grooves is 200mm, when the length of the heat exchange tube 420 is 300mm, the distance between the two clamping grooves is 300mm, the clamping grooves are circumferentially arranged along the radial outer wall surface of the exhaust gas recirculation tube, and when the clamping rings and the clamping grooves are clamped together, the air tightness is good, and the heat exchange tube 420 can also be supported.
The embodiment of the embodiment also discloses a heat exchange respiratory tube assembly of an engine, wherein two end parts of the heat exchange tube 420 are fixedly connected with the outer wall surface of the exhaust gas recirculation tube in a welding mode. When the heat exchange tube 420 and the exhaust gas recirculation tube are both provided as metal pipes, they are connected by welding, which provides high connection strength and connection stability, and also improves the sealability of the heat exchange tube 420.
The embodiment of the embodiment also discloses a heat exchange respiratory tube assembly of an engine, wherein the heat exchange tube 420 is a flexible tube, and an insulating layer (not shown in the figure) is further arranged on the outer wall surface of the heat exchange tube 420.
Specifically, in this embodiment, when the heat exchange tube 420 is a flexible tube, the heat exchange tube can be adaptively adjusted according to the arrangement and the trend of the exhaust gas recirculation tube, and the heat insulation layer is arranged on the outer wall surface of the heat exchange tube 420, so that the heat insulation effect of the heat exchange tube 420 can be improved.
Specifically, in this embodiment, the flexible pipe may be a common plastic pipe, a polyethylene pipe, a polyvinyl chloride pipe, or the like, and the insulating layer may also be made of polyurethane, glass wool, aluminum silicate, or other materials.
In summary, the present embodiment discloses a heat exchange breathing tube assembly of an engine, wherein a heat exchange breathing tube 400 in the heat exchange breathing tube assembly is sleeved outside an exhaust gas recirculation pipeline 300, and a curved gas channel 410 is formed between an inner wall surface of the heat exchange breathing tube 400 and an outer wall surface of the exhaust gas recirculation pipeline 300, so that heat dissipation capacity of the engine 100 can be effectively utilized, a problem of low-temperature icing of the breathing tube is effectively solved, and meanwhile, high-temperature gas requiring heat dissipation is cooled, thereby reducing intake temperature and knocking tendency, further improving effective thermal efficiency of the engine 100, enabling functional modules of the engine 100 to be more integrated, avoiding adding an additional heat insulation layer and adopting anti-icing measures such as electrical heating and water heating, and further reducing cost of parts.
Example 2
As another preferred embodiment of the present invention, the embodiment of this embodiment further discloses an engine 100, which includes an engine 100 body, and the working principle of the engine 100 body can be seen in fig. 3, the engine 100 body has an intake pipeline 500 and an exhaust pipeline 200, the intake pipeline 500 communicates with the engine 100 body through an intake manifold 110 and delivers fresh air to the engine 100 body, and the exhaust pipeline 200 is used for exhausting exhaust gas after combustion of the engine 100, and further includes the heat exchange breathing tube assembly disclosed in embodiment 1.
An inlet of the exhaust gas recirculation line 300 is communicated with the exhaust line 200, an exhaust gas recirculation cooler 310 and an exhaust gas recirculation valve 320 are further arranged on the exhaust gas recirculation line 300 and located upstream of the heat exchange breathing pipe 400, and an outlet of the exhaust gas recirculation line 300 is communicated with the intake manifold 110 on the engine 100. The intake conduit 500 further includes a throttle valve 510 and an air filter 520 disposed in that order upstream of the intake manifold 110, and the outlet of the crank gas passage 410 communicates with the intake conduit 500 between the throttle valve 510 and the air filter 520.
Specifically, in the present embodiment, a heat exchange breather pipe 400 is fitted over a part of the outer wall surface of the exhaust gas recirculation line 300 of the engine 100, and the circulating exhaust gas in the exhaust gas recirculation line 300 exchanges heat with the gas in the heat exchange breather pipe 400, so that the intake temperature of the circulating exhaust gas in the exhaust gas recirculation line 300 is lowered, and the knocking tendency is reduced. The temperature of the gas in the heat-exchange breathing tube 400 is further heated, so that the temperature at the joint when the gas in the heat-exchange breathing tube 400 enters the clean air tube of the air intake system is higher than the freezing temperature, and the blockage of the heat-exchange breathing tube 400 due to the freezing of the inner walls of the heat-exchange breathing tube 400 and the joint of the clean air intake pipeline 500 is avoided. And heat exchange respiratory tube 400 cover is established outside exhaust gas recirculation pipeline 300, and its structure is simpler, the volume is littleer, the degree of integration is higher, and need not set up extra fever relieving device.
It should be noted that, for an engine without an exhaust gas recirculation line, a breathing tube may be sleeved on the exhaust line 300 or other lines with higher gas temperature, and this embodiment is not particularly limited thereto.
More specifically, the working principle and the working process of the engine 100 provided in this embodiment and the heat exchange breathing tube assembly of the engine provided in embodiment 1 are taken as examples to explain:
first, the exhaust gas recirculation line 300 and the exhaust gas recirculation system of the engine 100 will be explained: as shown in fig. 3, when engine 100 is in operation, a piston cylinder in engine 100 operates, exhaust gas combusted in engine 100 is discharged through exhaust pipe 200, catalyst 210 and muffler 220 are disposed on exhaust pipe 200, an inlet of egr pipe 300 is connected between catalyst 210 and muffler 220, a portion of exhaust gas flows through egr pipe 300 to intake manifold 110, and enters engine 100 again for combustion, thereby improving fuel efficiency, and egr cooler 310 and egr valve 320 are disposed upstream of egr pipe 300, so exhaust gas temperature is high, and egr cooler 310 is disposed to cool down and reduce temperature of circulating exhaust gas. The tendency of engine 100 to knock is reduced.
Further, the heat exchange breathing pipe 400 is sleeved outside the exhaust gas recirculation pipeline 300 and is close to the downstream position, a curved gas passage 410 is formed between the inner wall surface of the heat exchange breathing pipe 400 and the outer wall surface of the exhaust gas recirculation pipeline 300, the inlet of the heat exchange breathing pipe 400 is communicated with the oil-gas separator 120 in the crankcase of the engine 100, the outlet of the heat exchange breathing pipe is communicated with the upstream air inlet pipeline 500 of the throttle valve 510, the gas separated by the oil-gas separator 120 contains a large amount of water vapor, and when passing through the curved gas passage 410, the gas is heated by the exhaust gas in the exhaust gas recirculation pipeline 300, so that the gas is not easy to freeze at low temperature. And the outlet of the heat-exchange breathing tube 400 communicates between the throttle valve 510 and the air filter 520 upstream of the intake manifold 110. Because the gas temperature of the circulating exhaust gas passing through the exhaust gas recirculation pipeline 300 is generally above 100 ℃, the gas in the crankcase is in a low-temperature environment of-30 ℃, the gas temperature after being separated by the oil-gas separator 120 is generally lower than 40 ℃ under a high-speed working condition, the crank gas in the crankcase is further heated after passing through the heat exchange breather tube 400, so that the temperature of the crank gas entering the air intake system and the temperature of the air intake pipeline 500 at the joint are higher than the icing temperature, and the freezing of the breather tube and the clean air intake pipeline 500 at the joint is avoided.
Furthermore, when the engine is installed on the automobile or the engine on the automobile is provided with the heat exchange respiratory tube assembly, the problem that the respiratory tube is easy to freeze and block when the temperature is lower in winter can be well avoided, and the heat exchange respiratory tube assembly is simple in structure, convenient to install, compact in structure and higher in integration degree.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a more detailed description of the invention, and the specific embodiments thereof are not to be considered as limiting. Various changes in form and detail, including simple deductions or substitutions, may be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (9)
1. A heat exchange breathing pipe assembly of an engine comprises an exhaust gas recirculation pipeline, wherein an inlet of the exhaust gas recirculation pipeline is communicated with an exhaust pipeline of the engine, an outlet of the exhaust gas recirculation pipeline is communicated with an air inlet manifold of the engine, and a circulating exhaust gas channel is arranged inside the exhaust gas recirculation pipeline; the method is characterized in that:
the exhaust gas recirculation system is characterized by further comprising a heat exchange breathing pipe, wherein the heat exchange breathing pipe is sleeved outside the exhaust gas recirculation pipeline, a crank gas channel is formed between the inner wall surface of the heat exchange breathing pipe and the outer wall surface of the exhaust gas recirculation pipeline, the inlet of the crank gas channel is communicated with an oil-gas separator of the engine, and the outlet of the crank gas channel is communicated with an upstream air inlet pipeline of a throttle valve; wherein
The heat exchange breathing pipe is positioned at the part immediately upstream of the outlet of the exhaust gas recirculation pipeline and extends along the length direction of the exhaust gas recirculation pipeline.
2. The heat-exchange breathing tube assembly for an engine of claim 1, wherein the heat-exchange breathing tube comprises a heat-exchange tube, an air inlet tube, and an air outlet tube, which are hermetically connected; wherein
The air inlet pipe is convexly arranged at the inlet of the curved gas channel, and the air outlet pipe is convexly arranged at the outlet of the curved gas channel; and is
The two ends of the air inlet pipe are respectively communicated with the oil-gas separator and the heat exchange pipe, and the two ends of the air outlet pipe are respectively communicated with the air inlet pipeline and the heat exchange pipe.
3. The heat exchange breathing tube assembly for an engine of claim 2 wherein the heat exchange tube has a diameter greater than a diameter of the exhaust gas recirculation tube.
4. The heat-exchange breathing tube assembly for an engine according to claim 3, wherein the meandering gas passage between the inner wall surface of the heat-exchanging tube and the outer wall surface of the exhaust gas recirculation tube is circular in ring shape in a cross section of the heat-exchanging tube and the exhaust gas recirculation tube in the axial direction, and the ring width dimension thereof is in the range of 10mm to 20 mm.
5. The heat-exchange breathing tube assembly for an engine according to claim 4, wherein the connecting portion of the air inlet tube and the heat-exchange tube and the connecting portion of the air outlet tube and the heat-exchange tube are both of a "T" shaped structure; wherein
One end part of the heat exchange tube close to the air inlet tube is in interference fit with the outer wall surface of the waste gas recirculation tube, and one end part of the heat exchange tube close to the air outlet tube is in interference fit with the outer wall surface of the waste gas recirculation tube.
6. The heat-exchange breathing tube assembly for an engine according to claim 4, wherein the outer wall surface of the exhaust gas recirculation tube is provided with two catching grooves spaced apart by the same distance as the length of the heat exchange tube, wherein each catching groove is circumferentially provided along the outer wall surface in the radial direction of the exhaust gas recirculation tube;
the two end parts of the heat exchange tube are provided with clamping rings matched with the clamping grooves, and the clamping rings are fixedly clamped in the clamping grooves.
7. The heat-exchange breathing tube assembly for an engine according to claim 4, wherein both end portions of the heat-exchange tube are fixedly connected to the outer wall surface of the exhaust gas recirculation tube by welding.
8. The heat exchange breathing tube assembly for an engine according to any one of claims 2 to 7, wherein the heat exchange tube is provided as a flexible tube, and an insulating layer is further provided on an outer wall surface of the heat exchange tube.
9. An engine comprising an engine block having an intake conduit communicating with the engine block through the intake manifold and delivering fresh air to the engine block, and an exhaust conduit for expelling exhaust gases resulting from combustion in the engine, further comprising a heat exchange breathing tube assembly according to any one of claims 1-8; wherein
An inlet of the exhaust gas recirculation pipeline is communicated with the exhaust pipeline, an exhaust gas recirculation cooler and an exhaust gas recirculation valve are further arranged on the exhaust gas recirculation pipeline and located at the upstream of the heat exchange breathing pipe, and an outlet of the exhaust gas recirculation pipeline is communicated with the air inlet manifold on the engine;
the air inlet pipeline further comprises a throttle valve and an air filter which are arranged on the upstream of the air inlet manifold in sequence, and the outlet of the crank gas channel is communicated with the air inlet pipeline between the throttle valve and the air filter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221835985.6U CN218062430U (en) | 2022-07-14 | 2022-07-14 | Heat exchange respiratory tube assembly of engine and engine with same |
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| CN202221835985.6U CN218062430U (en) | 2022-07-14 | 2022-07-14 | Heat exchange respiratory tube assembly of engine and engine with same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116255225A (en) * | 2023-03-20 | 2023-06-13 | 重庆长安汽车股份有限公司 | Engine assembly, vehicle and method for reducing engine oil dilution |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116255225A (en) * | 2023-03-20 | 2023-06-13 | 重庆长安汽车股份有限公司 | Engine assembly, vehicle and method for reducing engine oil dilution |
| CN116255225B (en) * | 2023-03-20 | 2024-04-19 | 重庆长安汽车股份有限公司 | Engine assembly, vehicle and method for reducing engine oil dilution |
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