Internal and external shunting type oil cooler

Abstract

The utility model discloses an internal and external shunting type oil cooler. A plurality of harmonica-shaped tubes are arranged on the oil cooler; a plurality of through holes are uniformly formed in the section of each harmonica-shaped tube at intervals; each harmonica-shaped tube is vertically arranged; the harmonica-shaped tubes are transversely arranged at intervals to form a longitudinal row; the multiple columns of harmonica-shaped tubes are longitudinally arranged at intervals; each H-shaped vapor chamber is formed by longitudinally connecting wing plates on the two sides and a middle waist plate, the wing plates on the two sides of each H-shaped vapor chamber are welded to the harmonica-shaped tubes, and the H-shaped vapor chambers are continuously arranged between the two rows of harmonica-shaped tubes; the multiple fuel oil inlet pipes and the multiple fuel oil outlet pipes are arranged on the two sides of the heat exchange core body respectively, and every two adjacent fuel oil inlet pipes and every two adjacent fuel oil outlet pipes are connected through a fuel oil front side partition plate and a fuel oil rear side partition plate which are provided with a plurality of upper through holes and a plurality of lower through holes at intervals. According to the oil cooler, the heat transfer efficiency of the oil cooler is improved, and meanwhile it is guaranteed that the oil cooler has extremely high pressure bearing capacity.

Description

Technical Field

[0001] The utility model relates to an oil cooler, in particular to an internal and external flow - split type oil cooler, and the internal flow channel design and improvement of heat transfer efficiency of the oil cooler. Background Technique

[0002] An oil cooler is a heat transfer device that uses heat conduction and mass transfer to transfer the heat of a high - temperature fluid to a cooling medium to cool the high - temperature fluid. Oil coolers are widely used in mechanical equipment such as generator sets, air - conditioning equipment, and construction machinery to ensure the normal operation of mechanical equipment by controlling the fluid temperature.

[0003] In traditional oil coolers, fluids usually flow through straight - type channels and staggered - type channels. However, due to the high internal fluid flow velocity in the straight - type channel design, large frictional forces and energy losses will occur during the process of the fluid passing through the channel. Although the internal flow channels with staggered - type channel design can reduce the fluid flow velocity, due to the complexity of the channel structure, it is difficult for the internal fluid to be evenly distributed, affecting the heat transfer efficiency of the oil cooler. Traditional oil coolers usually have a single fluid medium flowing through the entire cooler for cooling, but this single - medium cooling method has some deficiencies. For example, when different temperature requirements of two media need to be met simultaneously, specific cooling requirements cannot be satisfied.

[0004] Chinese invention patent CN 104625864 B discloses a fluorine - evaporation type detachable shell - tube oil cooler, which includes a square shell. Long - strip waist - shaped holes are axially opened on both sides of the square shell, and long - waist - shaped flange seats are arranged along the edges of the long - strip waist - shaped holes. The long - waist - shaped flange seats are fixedly connected with detachable long - waist - shaped flange covers through bolts and the connection is sealed by a flange cover gasket; between the long - strip waist - shaped holes of the square shell and the long - waist - shaped flange covers, an inner rubber cushion plate, a filling cushion plate, and an outer rubber cushion plate are filled in sequence from the inside out to seal the long - strip waist - shaped holes. This technology adopts the design of a square shell and is provided with detachable inspection and cleaning holes, solving the problem of difficult disassembly and cleaning. This technology connects both ends of the heat - exchange tube to a first tube box and a second tube box with multiple cavity structures, extending the flow path of the refrigerant, and arranging baffle plates to form an S - shaped flow path for cutting oil, enabling the refrigerant and cutting oil to fully contact and exchange heat in a limited volume, effectively improving the heat - exchange efficiency. However, this technology is generally still of a long - strip structure, and the strength of the oil cooler itself still needs to be improved and it is difficult to be competent in some occasions where the strength of the oil cooler itself is required to be relatively high; moreover, only by extending the flow path to improve the cooling efficiency is limited. Content of the Utility Model

[0005] The purpose of the utility model is to provide an internal and external flow - split type oil cooler. Through fluid splitting and re - distribution, while improving the heat - exchange efficiency of the oil cooler, it ensures strong pressure - bearing capacity and enables the oil cooler to have good operation stability.

[0006] The object of the utility model is achieved by the following technical solutions:

[0007] An internal and external flow-divided oil cooler, characterized in that it comprises a heat exchange core body; the heat exchange core body is mainly composed of an H-shaped heat dissipation plate, finned tubes and baffle plates; there are multiple finned tubes; each finned tube is evenly provided with a plurality of through holes at uniform intervals in the cross section; each finned tube is arranged vertically; multiple finned tubes are arranged horizontally at intervals to form a longitudinal row; multiple rows of finned tubes are arranged longitudinally at intervals; there are multiple H-shaped heat dissipation plates, and each H-shaped heat dissipation plate is longitudinally connected by two side wing plates and a middle waist plate, the two side wing plates of each H-shaped heat dissipation plate are welded to the finned tubes, and multiple H-shaped heat dissipation plates are continuously arranged between two rows of finned tubes; multiple fuel inlet pipes and multiple fuel outlet pipes are respectively arranged on both sides of the heat exchange core body, and adjacent two fuel inlet pipes and adjacent two fuel outlet pipes are connected by a fuel front baffle plate and a fuel rear baffle plate provided with a plurality of upper and lower through holes at intervals; each fuel inlet pipe and each of the multiple fuel outlet pipes are also provided with openings at intervals, and the baffle plates are provided with openings according to the distribution of the finned tubes, the baffle plates are vertically arranged in the middle of multiple H-shaped heat dissipation plates, and there is a gap between the bottom and the bottom of the heat exchange core body; each finned tube passes through the opening of the baffle plate, and both ends are respectively inserted into the openings of the fuel inlet pipe and the fuel outlet pipe; one fuel inlet pipe at the bottom or top is connected to the fuel inlet, and one fuel outlet pipe at the top or bottom is connected to the fuel outlet; fuel inlet side end plates and fuel front baffle plates are respectively arranged on both sides of the heat exchange core body between the fuel inlet pipe and the fuel outlet pipe; a lubricating oil side end plate and a lower end plate are respectively arranged at the top and bottom of the heat exchange core body; a lubricating oil inlet pipe and a lubricating oil outlet pipe are respectively arranged on both sides of the lubricating oil side end plate, and one end of the lubricating oil inlet pipe and the lubricating oil outlet pipe is respectively connected to the lubricating oil inlet and the lubricating oil outlet; through holes for communicating pipelines are arranged at intervals at the bottom of the lubricating oil inlet pipe and the lubricating oil outlet pipe; the lubricating oil side end plate is provided with an opening communicating with the inside of the heat exchange core body according to the distribution of the through holes in the lubricating oil inlet and the lubricating oil outlet.

[0008] To further achieve the object of the utility model, preferably, the finned tube is a plate provided with a plurality of through holes at intervals in the thickness direction.

[0009] Preferably, the cross-sectional shape of the through holes of the finned tube is rectangular, circular or semi-circular and their combinations.

[0010] Preferably, the through holes are rectangular, and the through holes at both ends are semi-circular; the distance between the middle through holes in the finned tube is 0.4 - 0.5 mm, and the width from the through holes of the finned tube to the outer edge is 0.4 - 0.6 mm.

[0011] Preferably, the horizontal distance between adjacent two finned tubes in the horizontal interval arrangement of the multiple finned tubes is 12 - 17 mm; the vertical distance between adjacent two finned tubes in the vertical interval arrangement of the multiple rows of finned tubes is 30 - 40 mm.

[0012] Preferably, the thicknesses of the two side wing plates and the middle waist plate of the H-shaped heat spreader are 0.4-0.6 mm and 1.5-2.5 mm respectively.

[0013] Preferably, the cross-section of the waist plate of the H-shaped heat spreader is a long strip or a V-shape.

[0014] Preferably, the waist plate of the H-shaped heat spreader is composed of two V-shaped cross-sections arranged at intervals; a V-shaped inner cavity with an interval of 0.5-1.5 mm is formed between the two waist plates, and acetone working medium is injected into the cavity.

[0015] Preferably, the fuel inlet pipe, the harmonica pipe and the fuel front baffle are all connected by brazing, and the fuel outlet pipe, the harmonica pipe and the fuel rear baffle are all connected by brazing.

[0016] Preferably, the material of the internal and external split-flow oil coolers is 6A02-T4 grade aluminum alloy.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] 1) High efficiency heat exchange and extremely high pressure bearing capacity are taken into account: The utility model adopts multiple groups of harmonica tubes and H-type heat spreader structure inside the internal and external split oil cooler. This structure effectively increases the heat conduction area and improves the heat exchange efficiency of the oil cooler, so that it can effectively cool the lubricating oil and heat the fuel oil, achieving a good heat exchange effect. At the same time, the harmonica tubes are arranged longitudinally, and the middle waist plate of the H-type heat spreader is also designed longitudinally. In particular, the two side wing plates of each H-type heat spreader of the utility model are welded to the harmonica tubes, and multiple H-type heat spreaders are continuously arranged between two rows of harmonica tubes. The H-type heat spreader is arranged longitudinally with the harmonica tubes. The heat exchange core of the utility model forms a longitudinal and transverse flow channel mesh arrangement structure, which is almost similar to a solid structure, so that the heat exchange core has extremely high pressure bearing capacity.

[0019] 2) Stable and durable, easy to maintain: The internal low-temperature fuel flow channel adopts a harmonica tube structure, and the external high-temperature lubricating oil flow channel adopts a straight channel structure, thereby realizing the separation of low-temperature fuel and high-temperature lubricating oil, and effectively avoiding adverse chemical reactions that may be caused by medium mixing; this flow channel separation structure not only improves the heat transfer efficiency but also extends the service life of the oil cooler, and can also reduce siltation and sediment in the oil cooler, making it easy to clean and maintain.

[0020] 3) High strength and good corrosion resistance: The oil cooler is made of 6A02-T4 grade aluminum alloy, which can reduce the overall weight of the oil cooler while maintaining good strength and corrosion resistance.

[0021] 4) Uniform fluid flow, beneficial for enhancing heat transfer: When the fluid flows through the oil cooler, it is restricted by the flow path and pipe structure, resulting in flow resistance during the flow process. These resistances cause uneven temperature distribution of the fluid in the oil cooler. Due to the excellent isothermal property of the heat pipe structure, the fluid can flow more uniformly in the oil cooler, making the temperature distribution of the fluid more uniform. In addition, when the fluid passes through the heat pipe, heat exchange occurs on its surface and in the internal cavity. The two wing surfaces of the H-shaped heat pipe are in contact with the outer surface of the corrugated pipe, enabling the fluid to contact the heat pipe surface more fully, increasing the contact area between the fluid and the heat pipe, and thus enhancing the heat exchange effect. Therefore, the use of an I-shaped heat pipe structure can not only make the fluid flow more uniformly inside the oil cooler but also improve the heat transfer efficiency of the oil cooler, providing better heat dissipation protection for the operation of mechanical equipment.

[0022] 5) Small fluid resistance: The fuel and lubricating oil inlet and outlet channels of this oil cooler both adopt a cylindrical structure, achieving excellent hydrodynamic performance. This structure can not only effectively reduce the fluid impact caused by the pressure difference, thereby enhancing the structural strength of the oil cooler, but also optimize the streamline design of the inlet and outlet channels to the greatest extent, further reducing fluid resistance and losses, and thus ensuring excellent heat transfer performance under high-pressure environments. Description of the Drawings

[0023] Figure 1 It is an overall appearance assembly schematic diagram of an internal and external split-flow oil cooler.

[0024] Figure 2 It is an explosion schematic diagram of an internal and external split-flow oil cooler.

[0025] Figure 3 For Figure 2 It is the front view of the internal core in

[0026] Figure 4 For Figure 2 It is the top view of the internal core in

[0027] Figure 5 For Figure 2 It is the front view of the baffle plate in

[0028] Figure 6 For Figure 2 It is the front view of the corrugated pipe in

[0029] Figure 7 For Figure 2 It is the schematic diagram of the H-shaped heat pipe in

[0030] Figure 8 For Figure 2 It is the cross-sectional view of the H-shaped heat pipe in

[0031] Figure 9For Figure 2 Schematic diagram of the front fuel partition board in

[0032] Figure 10 For Figure 2 Schematic diagram of the structure of the fuel outlet pipe in

[0033] Figure 11 For Figure 2 Schematic diagram of the structure of the lubricating oil outlet pipe in

[0034] The figure shows: fuel outlet pipe 1, fuel outlet pipe plug 1-1, rear fuel partition board 2, front fuel inlet end plate 3, lower end plate 4, baffle plate 5, H-shaped heat equalizing plate 6, corrugated pipe 7, front fuel partition board 8, fuel inlet 9, fuel inlet pipe 10, fuel outlet side end plate 11, lubricating oil side end plate 12, lubricating oil outlet 13, lubricating oil outlet pipe 14, lubricating oil outlet pipe plug 14-1, lubricating oil inlet pipe 15, lubricating oil inlet 16, fuel outlet 17. Detailed implementation mode

[0035] To better understand the present utility model, the present utility model will be further described below in conjunction with the accompanying drawings, but the implementation mode of the present utility model is not limited thereto.

[0036] Such as Figure 1-11As shown in the figure, an internal and external flow split type oil cooler includes a heat exchange core body; the heat exchange core body is mainly composed of an H-shaped heat sink 6, corrugated tubes 7 and baffle plates 5; there are multiple corrugated tubes 7; each corrugated tube is evenly provided with a plurality of through holes at uniform intervals in the cross section; each corrugated tube is arranged vertically; multiple corrugated tubes are arranged horizontally at intervals to form a longitudinal row; multiple rows of corrugated tubes are arranged longitudinally at intervals; there are multiple H-shaped heat sinks, and each H-shaped heat sink 6 is longitudinally connected by two side wing plates and a middle waist plate, and the two side wing plates of each H-shaped heat sink 6 are welded to the corrugated tubes 7, and multiple H-shaped heat sinks 6 are continuously arranged between two rows of corrugated tubes; multiple fuel inlet pipes 10 and multiple fuel outlet pipes 1 are respectively arranged on both sides of the heat exchange core body, and adjacent two fuel inlet pipes 10 and adjacent two fuel outlet pipes 1 are connected by a fuel front side partition plate 8 and a fuel rear side partition plate 2 provided with a plurality of upper and lower through holes at intervals; each fuel inlet pipe 10 and each of the multiple fuel outlet pipes 1 are also provided with openings at intervals, and the baffle plate 5 is provided with openings according to the distribution of the corrugated tubes 7, and the baffle plate 5 is vertically arranged in the middle of multiple H-shaped heat sinks, and there is a gap between the bottom and the bottom of the heat exchange core body; each corrugated tube 7 passes through the opening of the baffle plate 5, and both ends are respectively inserted into the openings of the fuel inlet pipe 10 and the fuel outlet pipe 1; one fuel inlet pipe 10 at the bottom end or the top end is connected to the fuel inlet 9, and one fuel outlet pipe 1 at the top end or the bottom end is connected to the fuel outlet 17; fuel inlet side end plates 3 and fuel front side partition plates 8 are respectively arranged on both sides between the fuel inlet pipe 10 and the fuel outlet pipe 1 of the heat exchange core body; a lubricating oil side end plate 12 and a lower end plate 4 are respectively arranged at the top and the bottom of the heat exchange core body; a lubricating oil inlet pipe 15 and a lubricating oil outlet pipe 14 are respectively arranged on both sides of the lubricating oil side end plate 12, and one ends of the lubricating oil inlet pipe 15 and the lubricating oil outlet pipe 14 are respectively connected to the lubricating oil inlet 16 and the lubricating oil outlet 13; through holes for connecting pipelines are arranged at intervals at the bottom of the lubricating oil inlet pipe 15 and the lubricating oil outlet pipe 14; the lubricating oil side end plate 12 is provided with an opening for communicating with the inside of the heat exchange core body according to the distribution of the through holes in the lubricating oil inlet 16 and the lubricating oil outlet 13.

[0037] As Figure 2 and 9As shown, the bottom surface of the lower end plate 4 is a plane and can be fixedly installed at the bottom of the engine box. Both ends of the harmonica tube 7 are inserted into the fuel inlet pipe 10 and the fuel outlet pipe 1 respectively. The front fuel partition plate 8 and the rear fuel partition plate 2 are both evenly provided with a plurality of oval holes, which are respectively matched with the oval openings on the pipe walls of the fuel inlet pipe 10 and the fuel outlet pipe 1. The fuel inlet pipe 10, the harmonica tube 7 and the front fuel partition plate 8 are all connected by brazing, and the fuel outlet pipe 1, the harmonica tube 7 and the rear fuel partition plate 2 are all connected by brazing to form an internal low-temperature fuel flow path. The low-temperature fuel flows in through the fuel inlet 9 on the front side of the lower part of the housing, is evenly distributed in the bottom flow path through the internal harmonica tube 7, and then flows reversely into the upper flow path through the rear fuel partition plate 2 arranged longitudinally and matched with the cylindrical flow path, and finally flows out through the fuel outlet 17 on the rear side of the upper part of the housing. The fuel inlet and outlet are arranged diagonally up and down, which is beneficial to the smooth flow of fuel in the internal flow path, reduces the pressure loss during the flow process; at the same time, it can also reduce the overall size of the oil cooler and save space; the diagonal arrangement can also increase the flow path length of the fuel, thereby increasing the fuel flow rate.

[0038] As Figure 2 , 3 , 4 and 5 show that the lubricating oil outlet pipe 14 and the lubricating oil inlet pipe 15 are connected to the lubricating oil side end plate 12 by brazing. The baffle plate 5 is located in the middle of the harmonica tube 7, and the H-shaped heat sink 6 is symmetrically distributed on the front and rear sides of the baffle plate 5 between the harmonica tubes 7. Multiple groups of H-shaped heat sinks 6 are arranged in an H shape between the harmonica tubes. The two wing flange surfaces of the H-shaped heat sink 6 are respectively in contact with the outer wall surface of the harmonica tube 7, and the H-shaped heat sinks in the same row are in close contact and are connected by brazing. The high-temperature lubricating oil of the internal and external split-flow type oil cooler flows in through the lubricating oil inlet 16 on the upper part of the housing, flows through the through holes on the lubricating oil inlet pipe 15 and the lubricating oil side end plate 12 to the multiple direct flow channels composed of the H-shaped heat sink 7, enters the flow path separated by the baffle plate 5 at the bottom, flows to the lubricating oil outlet pipe 14, and finally flows out from the lubricating oil outlet 13.

[0039] As Figure 5 shown, the baffle plate 5 is provided with multiple rows of through holes, and each through hole corresponds to a harmonica tube 7; the functions of the baffle plate 5 are: it can separate the high-temperature lubricating oil flow path, form a fixed flow path, and make the lubricating oil flow more evenly inside the oil cooler; it can cause the lubricating oil to flow repeatedly when flowing through the baffle plate, increase the contact area between the lubricating oil and the outer wall surface of the harmonica tube and the H-shaped heat sink, and improve the lubricating oil heat dissipation efficiency; it can assist in fixing the harmonica tube 7 and prevent the harmonica tube 7 from vibrating under normal working conditions and reducing the life of the harmonica tube.

[0040] The harmonica tube 7 is prepared by the hot extrusion method. After heating the aluminum alloy plate to a certain temperature, it is put into an extruder and formed into the required shape under high pressure. The harmonica tube 7 is a plate provided with a plurality of through holes at intervals along the thickness direction; the cross-sectional shape of the through holes of the harmonica tube 7 is rectangular, circular or semi-circular and their combinations; As Figure 6As shown, it is preferred that the middle through-hole is rectangular and the through-holes at both ends are semi-circular; the distance between the middle through-holes in the harmonica tube is 0.4 - 0.5 mm, preferably 0.45 mm; the width from the through-hole of the harmonica tube to the outer edge is 0.4 - 0.6 mm, preferably 0.5 mm. In the transverse interval arrangement of multiple harmonica tubes, the transverse distance between two adjacent harmonica tubes is 12 - 17 mm, preferably 14 - 15 mm; in the longitudinal interval arrangement of multiple columns of harmonica tubes, the longitudinal distance between two adjacent harmonica tubes is 30 - 40 mm, preferably 34 - 35 mm. The harmonica tube guides the fuel flowing into the fuel inlet 9 into its internal flow channel, controls the flow rate and pressure of the fuel through the flow channel, and then promotes the fuel to flow evenly through the internal flow channel of the harmonica tube to achieve a better cooling effect; at the same time, the harmonica tube also plays a role in shunting, further reducing the lubricating oil temperature.

[0041] As Figure 7 and 8As shown, the H-shaped heat pipe 6 is composed of two side wing plates and a middle waist plate. The thicknesses of the two side wing plates and the middle waist plate are 0.4 - 0.6 mm (preferably 0.5 mm) and 1.5 - 2.5 mm (preferably 2 mm) respectively; the thickness of the two side flanges of the H-shaped heat pipe 6 is 0.4 - 0.6 mm, the total thickness of the middle heat pipe is 2 mm, and the thickness of the V-shaped cavity inside the heat pipe is 1 mm. The material of the H-shaped heat pipe 6 is aluminum alloy of 6A02 grade. The cross-section of the waist plate of the H-shaped heat pipe 6 is rectangular or V-shaped; preferably, the cross-section of the waist plate of the H-shaped heat pipe 6 is V-shaped; especially preferably, the waist plate of the H-shaped heat pipe 6 is composed of two V-shaped cross-sections arranged at intervals; a V-shaped inner cavity with an interval of 0.5 - 1.5 mm is formed between the two waist plates. An appropriate amount of acetone working fluid is injected into the cavity, and then the waist plate is completely sealed, and a reliability test is carried out in a constant temperature water bath to ensure good sealing. The H-shaped heat pipe 6 has significant advantages in both structural strength and fluid heat transfer. The equal-thickness flanges on both sides of the H-shaped heat pipe 6 are all formed by rolling and are connected to the middle heat pipe by brazing, with simple operation. The cross-sectional shape of the H-shaped heat pipe 6 is reasonable, with large lateral stiffness and strong bending resistance. It can make the aluminum alloy profile give full play to the material efficiency and improve the structural bearing capacity. When high-temperature lubricating oil flows through the H-shaped heat pipe, its heat will be transferred to the two side flanges of the H-shaped heat pipe, and then through the surface with a large contact area between the flange of the H-shaped heat pipe and the outer wall surface of the finned tube, the heat is transferred to the low-temperature fuel through the finned tube wall surface. Thus, the temperature difference between the high-temperature lubricating oil and the low-temperature fuel is reduced, improving the efficiency and stability of the system. The role of the V-shaped cavity inside the H-shaped heat pipe: it helps to increase the heat exchange contact area, and the heat can be more evenly dispersed to the surface of the heat pipe, reducing the generation of hot spots and cold spots; the working fluid inside the V-shaped cavity converges on the low side under the action of its own gravity, and the convergence and flow of the working fluid contribute to the uniform distribution of heat and improve the heat management effect. In addition, the H-shaped heat pipe structure significantly improves the heat transfer intensity, enhances the heat transfer, and improves the overall heat transfer efficiency of the oil cooler. At the same time, due to its good temperature equalization effect, the temperature difference of the lubricating oil before and after flowing through the heat pipe is reduced, enhancing the temperature equalization effect.

[0042] As Figure 10 and 11 shown, the fuel outlet pipe 1, the fuel inlet pipe 10, the lubricating oil outlet pipe 14, and the lubricating oil inlet pipe 15 all adopt cylindrical pipes; the significant advantage of the cylindrical pipe compared with other pipes such as rectangular pipes is that the cylindrical pipe is uniformly compressed in all directions. When the fluid is injected into the internal tube pass and the external shell pass of the cylindrical pipe at the designed flow rate, the impact loads it receives in all directions are the same, enhancing the overall structural strength and service life of the oil cooler. Fuel outlet pipe plugs 1-1 and lubricating oil outlet pipe plugs 14-1 are respectively provided at the outlets of the fuel outlet pipe 1 and the lubricating oil outlet pipe 14.

[0043] On the front and back sides of the oil cooler housing of the present utility model, a plurality of cylinders are arranged in parallel and vertically. Both the front and rear ends of the finned tubes are inserted into the cylindrical structures for fixation. The cylinders above and below are connected by fuel side partitions. Elliptical holes are opened on the contact surfaces between the cylinders and the fuel side partitions for the uniform inflow of fuel.

[0044] The working process of an internal and external flow - divided oil cooler: Inject low - temperature fuel into the cylindrical fuel inlet pipe. After being evenly distributed in the bottom - layer flow channel through the internal finned tubes, it flows counter - currently into the upper - layer flow channel through the fuel side partitions (front fuel side partition 8 and rear fuel side partition 2) arranged longitudinally and cooperating with the cylindrical flow channels, and finally flows out through the cylindrical fuel outlet pipe at the upper part of the housing. At the same time, high - temperature lubricating oil flows in through the cylindrical lubricating oil inlet pipe at the upper part of the housing body and flows out through the cylindrical outlet pipe after passing through the narrow flow channels formed by the H - shaped heat - equalizing plates. The fuel and lubricating oil passing through the oil cooler then flow back to the engine and the lubrication system respectively, thus ensuring the normal operation of the engine and the lubrication system. The low - temperature fuel flow channel and the high - temperature lubricating oil flow channel do not interfere with each other. On the premise of ensuring the safe operation of the oil cooler, heat exchange is achieved through the wall surface of the finned tubes, achieving the purpose of efficiently cooling the lubricating oil. During this process, the internal and external flow channels are arranged in a staggered manner. Both the front and rear of the finned tubes are inserted into the cylindrical flow channel tube structures for fixation to prevent vibration. Structures such as baffle plates and H - shaped heat - equalizing plates play roles in controlling fluid flow and heat transfer, enabling the oil cooler to effectively cool the fuel and the lubricating oil.

[0045] The lubricating oil inlet and outlet of the present utility model adopt oval - shaped special - shaped flange plates for threaded connection with the cylindrical lubricating oil inlet and outlet pipes.

[0046] The fuel inlet and outlet and the lubricating oil inlet and outlet of the present utility model are arranged in a counter - current manner. The low - temperature fuel enters from the bottom and exits from the top, and the high - temperature lubricating oil flows from top to bottom.

[0047] The materials of the oil cooler of the present utility model are all 6A02 - T4 grade aluminum alloy.

[0048] The internal part of the internal and external flow - divided oil cooler of the present utility model adopts multiple groups of finned tubes and H - shaped heat - equalizing plate structures. This structure effectively increases the heat conduction area, improves the heat exchange efficiency of the oil cooler, and thus can effectively cool the lubricating oil and heat the fuel, achieving a good heat exchange effect. At the same time, the finned tubes are arranged longitudinally, and the middle waist plate of the H - shaped heat - equalizing plate is also longitudinally designed. In particular, the two wing plates of each H - shaped heat - equalizing plate of the present utility model are welded to the finned tubes. Multiple H - shaped heat - equalizing plates are continuously arranged between two rows of finned tubes. The H - shaped heat - equalizing plates are arranged longitudinally in cooperation with the finned tubes, and the heat exchange core body of the present utility model forms a longitudinal and transverse flow channel network - like arrangement structure, almost similar to a solid structure, making the heat exchange core body have extremely high pressure - bearing capacity.

[0049] For those of ordinary skill in the art, other various forms of changes or modifications can be made on the basis of the above description. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. An internal and external split flow oil cooler, characterized in that: It includes a heat exchange core; the heat exchange core is mainly composed of an H-shaped heat spreader, a harmonica tube and a baffle; there are multiple harmonica tubes; each harmonica tube has a cross-section and is evenly spaced and provided with multiple through holes; each harmonica tube is arranged vertically; multiple harmonica tubes are arranged horizontally and spaced to form a longitudinal column; multiple columns of harmonica tubes are arranged longitudinally and spaced; there are multiple H-shaped heat spreaders, each H-shaped heat spreader is composed of two side wing plates and a middle waist plate connected longitudinally, the two side wing plates of each H-shaped heat spreader are welded to the harmonica tube, and multiple H-shaped heat spreaders are continuously arranged between two rows of harmonica tubes; multiple fuel inlet pipes and multiple fuel outlet pipes are respectively arranged on both sides of the heat exchange core, and two adjacent fuel inlet pipes and two adjacent fuel outlet pipes are connected by a fuel front baffle and a fuel rear baffle with multiple upper and lower through holes at intervals; each fuel inlet pipe and each of the multiple fuel outlet pipes have openings at intervals, and the baffle is provided with openings according to the distribution of the harmonica tubes, and the baffles The plate is vertically arranged in the middle of multiple H-shaped heat spreaders, and a gap is provided between the bottom and the bottom of the heat exchange core; each harmonica tube passes through the opening of the baffle plate, and the two ends are respectively inserted into the openings of the fuel inlet pipe and the fuel outlet pipe; a fuel inlet pipe at the bottom or top end is connected to the fuel inlet, and a fuel outlet pipe at the top or bottom end is connected to the fuel outlet; a fuel inlet side end plate and a fuel front side partition are respectively provided on both sides of the heat exchange core between the fuel inlet pipe and the fuel outlet pipe; a lubricating oil side end plate and a lower end plate are respectively provided on the top and bottom of the heat exchange core; a lubricating oil inlet pipe and a lubricating oil outlet pipe are respectively provided on both sides of the lubricating oil side end plate, and one end of the lubricating oil inlet pipe and the lubricating oil outlet pipe are respectively connected to the lubricating oil inlet and the lubricating oil outlet; through holes for connecting pipes are provided at intervals at the bottom of the lubricating oil inlet pipe and the lubricating oil outlet pipe; the lubricating oil side end plate is provided with an opening connected to the heat exchange core according to the distribution of the through holes in the lubricating oil inlet and the lubricating oil outlet.

2. The internal and external split flow oil cooler according to claim 1, characterized in that: The harmonica pipe is a plate with a plurality of through holes spaced apart along the thickness direction.

3. The internal and external split flow oil cooler according to claim 1 or 2, characterized in that: The cross-sectional shape of the through hole of the harmonica pipe is rectangular, circular or semicircular or a combination thereof.

4. The internal and external split flow oil cooler according to claim 3, characterized in that: The through hole is rectangular, and the through holes at both ends are semicircular; the spacing between the through holes in the harmonica tube is 0.4-0.5mm, and the width from the through hole to the outer edge of the harmonica tube is 0.4-0.6mm.

5. The internal and external split flow oil cooler according to claim 1, characterized in that: The lateral spacing between two adjacent harmonica pipes in the lateral spacing arrangement of the plurality of harmonica pipes is 12-17 mm; the longitudinal spacing between two adjacent harmonica pipes in the longitudinal spacing arrangement of the plurality of harmonica pipes is 30-40 mm.

6. The internal and external split flow oil cooler according to claim 1, characterized in that: The thicknesses of the two side wing plates and the middle waist plate of the H-shaped heat spreader are 0.4-0.6 mm and 1.5-2.5 mm respectively.

7. The internal and external split flow oil cooler according to claim 6, characterized in that: The cross section of the waist plate of the H-shaped heat spreader is a long strip or a V-shape.

8. The internal and external split flow oil cooler according to claim 7, characterized in that: The waist plate of the H-shaped heat spreader is composed of two V-shaped cross-sections arranged at intervals; a V-shaped inner cavity with an interval of 0.5-1.5 mm is formed between the two waist plates, and acetone working medium is injected into the cavity.

9. The internal and external split flow oil cooler according to claim 1, characterized in that: The fuel inlet pipe, the harmonica pipe and the fuel front baffle are all connected by brazing, and the fuel outlet pipe, the harmonica pipe and the fuel rear baffle are all connected by brazing.

10. The internal-external split-flow oil cooler according to claim 1, characterized in that: The material of the internal and external split-flow oil cooler is 6A02-T4 grade aluminum alloy.

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