CN118623667A

CN118623667A - Internal and external split flow oil cooler

Info

Publication number: CN118623667A
Application number: CN202410905895.7A
Authority: CN
Inventors: 简弃非; 田美; 周建军; 贺国崇; 于霄
Original assignee: South China University of Technology SCUT; AECC Shenyang Engine Research Institute; Guangzhou Institute of Technology
Current assignee: South China University of Technology SCUT; AECC Shenyang Engine Research Institute; Guangzhou Institute of Technology
Priority date: 2024-07-08
Filing date: 2024-07-08
Publication date: 2024-09-10

Abstract

The invention discloses an internal and external split flow oil cooler, the oil cooler has multiple harmonica tubes; each harmonica tube cross section is evenly spaced and evenly provided with multiple through holes; each harmonica tube is arranged vertically; multiple harmonica tubes are arranged horizontally and spaced to form a longitudinal row; multiple rows of harmonica tubes are arranged longitudinally and spaced; multiple H-type heat spreaders are provided, each H-type heat spreader is composed of two side wing plates and a middle waist plate connected longitudinally, the two side wing plates of each H-type heat spreader are welded to the harmonica tube, and multiple H-type 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 spaced apart. The invention improves the heat transfer efficiency of the oil cooler while ensuring that the oil cooler has an extremely high pressure bearing capacity.

Description

Inside and outside split-flow type oil cooler

Technical Field

The invention relates to an oil cooler, in particular to an inner and outer split-flow type oil cooler, which is characterized in that the design of an inner runner and the heat transfer efficiency of the oil cooler are improved.

Background

The oil cooler is a heat transfer device, and transfers heat of high-temperature fluid to a cooling medium by utilizing heat conduction and mass transfer effects, so that the temperature of the high-temperature fluid is reduced. The oil cooler is widely applied to mechanical equipment such as generator sets, air conditioning equipment, engineering machinery and the like, and the normal operation of the mechanical equipment is ensured by controlling the temperature of fluid.

In conventional oil coolers, the fluid typically flows in straight flow channels and staggered flow channels. However, due to the high internal fluid flow rates of the straight flow path design, large frictional forces and energy losses are created during the fluid flow through the flow path. While the flow velocity of the fluid can be reduced by adopting the internal flow channel designed by the staggered flow channel, the internal fluid is difficult to uniformly distribute due to the complexity of the flow channel structure, and the heat transfer efficiency of the oil cooler is affected. Conventional oil coolers typically cool a single fluid medium through the entire cooler, but this single medium cooling method suffers from drawbacks, such as being unable to meet specific cooling requirements when it is desired to meet different temperature requirements of both media simultaneously.

The Chinese patent CN 104625864B discloses a fluorine evaporation type detachable shell-and-tube oil cooler, which comprises a square shell, wherein two sides of the square shell are axially provided with a long-strip-shaped waist hole, the edge of the long-strip-shaped waist hole is provided with a long-waist-shaped flange seat, the long-waist-shaped flange seat is fixedly connected with a detachable long-waist-shaped flange cover plate through bolts, and the joint is sealed through a flange cover plate sealing gasket; an inner rubber backing plate, a filling backing plate and an outer rubber backing plate are sequentially filled between the strip-shaped waist hole of the square shell and the long-waist-shaped flange cover plate from inside to outside to seal the strip-shaped waist hole. The technology adopts the design of a square shell, is provided with a detachable checking and cleaning hole, and solves the difficult problem of difficult disassembly and cleaning. According to the technology, two ends of the heat exchange tube are connected with the first tube box and the second tube box which are provided with a plurality of cavity structures, the flow path of the refrigerant is prolonged, the baffle plate is arranged to form the S-shaped flow path of the cutting oil, and the refrigerant and the cutting oil are fully contacted for heat exchange in a limited volume, so that the heat exchange efficiency is effectively improved. However, the technology is of a strip-shaped structure, the strength of the oil cooler is still to be improved, and the technology is difficult to be qualified in occasions needing higher strength of the oil cooler; and there is a limit in improving the cooling efficiency only by extending the flow path.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides an oil cooler with an H-shaped soaking plate heat transfer unit structure, which can reduce the flow resistance of fluid and improve the heat exchange efficiency of the oil cooler, and particularly has strong bearing capacity, so that the stable operation of engineering mechanical equipment is ensured.

Disclosure of Invention

The invention aims to provide an internal and external split-type oil cooler, which improves the heat exchange efficiency of the oil cooler and ensures strong bearing capacity and good operation stability of the oil cooler through fluid split and redistribution.

The invention aims at realizing the following technical scheme:

An internal and external split-type oil cooler is characterized by comprising a heat exchange core body; the heat exchange core body mainly comprises an H-shaped vapor chamber, harmonica pipes and baffle plates; the harmonica tube is provided with a plurality of harmonica tubes; the cross section of each harmonica pipe is uniformly provided with a plurality of through holes at uniform intervals; each harmonica tube is vertically arranged; the harmonica tubes are transversely arranged at intervals to form a longitudinal row; the harmonica tubes are longitudinally arranged at intervals; the H-shaped soaking plates are provided with a plurality of H-shaped soaking plates, each H-shaped soaking plate is formed by longitudinally connecting two side wing plates and a middle waist plate, the two side wing plates of each H-shaped soaking plate are welded with the harmonica tubes, and the H-shaped soaking plates are continuously arranged between two rows of harmonica tubes; the fuel oil inlet pipes and the fuel oil outlet pipes are respectively arranged at two sides of the heat exchange core body, and two adjacent fuel oil inlet pipes and two adjacent fuel oil outlet pipes are connected through a fuel oil front side baffle plate and a fuel oil rear side baffle plate which are provided with a plurality of upper and lower through holes at intervals; openings are arranged at intervals between each fuel inlet pipe and each plurality of fuel outlet pipes, the baffle plates are provided with openings according to the distribution of the harmonica pipes, the baffle plates are vertically arranged at the middle parts of the H-shaped soaking plates, and gaps are formed between the bottoms of the baffle plates and the bottoms of the heat exchange cores; each harmonica pipe penetrates through the opening of the baffle plate, and two ends of each harmonica pipe are respectively inserted into the openings of the fuel inlet pipe and the fuel outlet pipe; a fuel inlet pipe at the bottom end or the top end is connected with the fuel inlet, and a fuel outlet pipe at the top end or the bottom end is connected with the fuel outlet; two sides of the heat exchange core body between the fuel inlet pipe and the fuel outlet pipe are respectively provided with a fuel inlet side end plate and a fuel front side baffle plate; the top and the bottom of the heat exchange core body are respectively provided with an oil side end plate and a lower end plate; the two sides of the end plate on the lubricating oil side are respectively provided with a lubricating oil inlet pipe and a lubricating oil outlet pipe, and one ends of the lubricating oil inlet pipe and the lubricating oil outlet pipe are respectively connected with the lubricating oil inlet and the lubricating oil outlet; through holes for communicating pipelines are formed at the bottoms of the lubricating oil inlet pipe and the lubricating oil outlet pipe at intervals; the oil side end plate is provided with openings communicated with the heat exchange core body according to the distribution of the through holes in the oil inlet and the oil outlet.

To further achieve the object of the present invention, preferably, the harmonica tube is a plate material provided with a plurality of through holes at intervals in a thickness direction.

Preferably, the cross section of the through hole of the harmonica tube is rectangular, circular or semicircular and the combination thereof.

Preferably, the through holes are rectangular, and the through holes at the two ends are semicircular; the distance between the through holes in the harmonica tube is 0.4-0.5mm,

The width from the through hole of the harmonica tube to the outer side edge is 0.4-0.6mm.

Preferably, the transverse distance between every two adjacent harmonica tubes in the transverse interval arrangement of the harmonica tubes is 12-17mm;

the longitudinal distance between two adjacent harmonica pipes in the longitudinal arrangement of the harmonica pipes is 30-40mm.

Preferably, the thicknesses of the wing plates at the two sides and the middle waist plate of the H-shaped soaking plate are respectively 0.4-0.6mm and 1.5-2.5mm.

Preferably, the section of the waist plate of the H-shaped vapor chamber is strip-shaped or V-shaped.

Preferably, the waist plates of the H-shaped soaking plate are formed by two V-shaped section intervals; a V-shaped inner cavity with the interval of 0.5-1.5mm is formed between the two waist plates, and acetone working medium is injected into the cavity.

Preferably, the cylindrical fuel inlet and outlet pipe, the harmonica pipe and the fuel front side baffle are all connected through brazing, and the harmonica pipe of the fuel outlet pipe and the fuel rear side baffle are all connected through brazing.

Preferably, the materials of the inner and outer split-type oil coolers are all 6A02-T4 grade aluminum alloy.

Compared with the prior art, the invention has the following advantages:

1) High-efficiency heat exchange and extremely high bearing capacity are considered at the same time: the inside and outside split-flow type oil cooler adopts a plurality of groups of harmonica pipes and the H-shaped soaking plate structure, and the structure effectively increases the heat conduction area and improves the heat exchange efficiency of the oil cooler, so that lubricating oil can be effectively cooled and fuel oil can be heated, and a good heat exchange effect is achieved. Meanwhile, the harmonica pipes are longitudinally arranged, and the middle waist plates of the H-shaped soaking plates are also longitudinally designed, in particular, the two side wing plates of each H-shaped soaking plate are welded with the harmonica pipes, a plurality of H-shaped soaking plates are continuously arranged between two rows of harmonica pipes, the H-shaped soaking plates are longitudinally arranged in cooperation with the harmonica pipes, and the heat exchange core body forms a longitudinal and transverse runner reticular arrangement structure which is almost similar to a solid structure, so that the heat exchange core body has extremely high pressure bearing capacity.

2) Stable and durable, convenient maintenance: the internal low-temperature fuel oil flow passage adopts a harmonica-shaped pipe structure, and the external high-temperature lubricating oil flow passage adopts a direct flow passage structure, so that the separation of low-temperature fuel oil and high-temperature lubricating oil is realized, and adverse chemical reactions possibly generated by medium mixing are effectively avoided; the flow passage separating structure improves the heat transfer efficiency, prolongs the service life of the oil cooler, reduces the sediment and the sediment in the oil cooler, and is convenient to clean and maintain.

3) High strength and good corrosion resistance: the oil cooler is made of 6A02-T4 grade aluminum alloy materials, so that the overall weight of the oil cooler is reduced, and meanwhile, the strength and corrosion resistance of the oil cooler can be improved.

4) The fluid flows uniformly, which is beneficial to enhancing heat transfer: as the fluid flows through the interior of the oil cooler, it is restricted by the flow path and the piping structure, resulting in a flow resistance of the fluid during flow. These resistances can lead to maldistribution of fluid temperature within the oil cooler. Because the soaking plate structure has excellent isothermicity, the fluid can flow more uniformly in the oil cooler, so that the temperature distribution of the fluid is more uniform. In addition, when the fluid passes through the vapor chamber, heat exchange is performed in the cavity on the surface and inside of the vapor chamber. The two flange surfaces of the H-shaped soaking plate are contacted with the outer surface of the harmonica pipe, so that fluid can be more fully contacted with the surface of the soaking plate, the contact area between the fluid and the soaking plate is increased, and the heat exchange effect is enhanced. Therefore, the soaking plate adopting the I-shaped structure not only can enable fluid to flow more uniformly in the oil cooler, but also can improve the heat transfer efficiency of the oil cooler, thereby providing better heat dissipation guarantee for the work of mechanical equipment.

5) The fluid resistance is small: the fuel oil and the lubricating oil inlet and outlet flow passages of the oil cooler are of cylindrical structures, so that excellent fluid dynamics performance is realized. The structure not only can effectively reduce fluid impact caused by pressure difference so as to improve the structural strength of the oil cooler, but also can optimize the streamline design of the inlet and outlet flow channels to the greatest extent, further reduce fluid resistance and loss, and further ensure excellent heat transfer performance in a high-pressure environment.

Drawings

FIG. 1 is a schematic view showing the overall exterior assembly of an internal and external split oil cooler.

FIG. 2 is an exploded schematic view of an inside-outside split oil cooler.

Fig. 3 is a front view of the inner core of fig. 2.

Fig. 4 is a top view of the inner core of fig. 2.

Fig. 5 is a front view of the baffle of fig. 2.

Fig. 6 is a front view of the mouth tube of fig. 2.

Fig. 7 is a schematic view of the H-type soaking plate in fig. 2.

Fig. 8 is a cross-sectional view of the H-type soaking plate in fig. 2.

Fig. 9 is a schematic view of the fuel front baffle of fig. 2.

Fig. 10 is a schematic view of the fuel outlet pipe of fig. 2.

Fig. 11 is a schematic view of the structure of the oil outlet pipe in fig. 2.

The figure shows: the fuel outlet pipe 1, the fuel outlet pipe plug 1-1, the fuel rear side baffle plate 2, the fuel inlet side end plate 3, the lower end plate 4, the baffle plate 5, the H-shaped soaking plate 6, the harmonica pipe 7, the fuel front side baffle plate 8, the fuel inlet 9, the fuel inlet pipe 10, the fuel outlet side end plate 11, the lubricating oil side end plate 12, the lubricating oil outlet 13, the lubricating oil outlet pipe 14, the lubricating oil outlet pipe plug 14-1, the lubricating oil inlet pipe 15, the lubricating oil inlet 16 and the fuel outlet 17.

Detailed Description

For a better understanding of the present invention, the following description of the invention is given with reference to the accompanying drawings, but the embodiments of the invention are not limited thereto.

As shown in fig. 1-11, an internal and external split-type oil cooler comprises a heat exchange core; the heat exchange core body mainly comprises an H-shaped soaking plate 6, a harmonica pipe 7 and a baffle plate 5; the harmonica tube 7 is provided with a plurality of harmonica tubes; the cross section of each harmonica pipe is uniformly provided with a plurality of through holes at uniform intervals; each harmonica tube is vertically arranged; the harmonica tubes are transversely arranged at intervals to form a longitudinal row; the harmonica tubes are longitudinally arranged at intervals; the H-shaped soaking plates are provided with a plurality of H-shaped soaking plates, each H-shaped soaking plate 6 is formed by longitudinally connecting two side wing plates and a middle waist plate, the two side wing plates of each H-shaped soaking plate 6 are welded with the harmonica tubes 7, and the H-shaped soaking plates 6 are continuously arranged between two rows of harmonica tubes; the fuel inlet pipes 10 and the fuel outlet pipes 1 are respectively arranged at two sides of the heat exchange core body, and two adjacent fuel inlet pipes 10 and two adjacent fuel outlet pipes 1 are connected through a fuel front side baffle plate 8 and a fuel rear side baffle plate 2 which are provided with a plurality of upper and lower through holes at intervals; each fuel inlet pipe 10 and each plurality of fuel outlet pipes 1 are provided with openings at intervals, the baffle plates 5 are provided with openings according to the distribution of the harmonica pipes 7, the baffle plates 5 are vertically arranged at the middle parts of the H-shaped soaking plates, and gaps are formed between the bottoms of the H-shaped soaking plates and the bottoms of the heat exchange cores; each harmonica pipe 7 passes through the opening of the baffle plate 5, and two ends of each harmonica pipe are respectively inserted into the openings of the fuel inlet pipe 10 and the fuel outlet pipe 1; a fuel inlet pipe 10 at the bottom or top is connected with the fuel inlet 9, and a fuel outlet pipe 1 at the top or bottom is connected with the fuel outlet 17; a fuel inlet side end plate 3 and a fuel front side baffle plate 8 are respectively arranged at two sides between the fuel inlet pipe 10 and the fuel outlet pipe 1 of the heat exchange core body; the top and the bottom of the heat exchange core body are respectively provided with an oil side end plate 12 and a lower end plate 4; the two sides of the oil side end plate 12 are respectively provided with an oil inlet pipe 15 and an oil outlet pipe 14, and one ends of the oil inlet pipe 15 and the oil outlet pipe 14 are respectively connected with an oil inlet 16 and an oil outlet 13; the bottoms of the lubricating oil inlet pipe 15 and the lubricating oil outlet pipe 14 are provided with through holes for communicating pipelines at intervals; the oil side end plate 12 is provided with openings communicating with the inside of the heat exchange core according to the distribution of the through holes in the oil inlet 16 and the oil outlet 13.

As shown in fig. 2 and 9, the bottom surface of the lower end plate 4 is a plane and can be fixedly mounted on the bottom of the engine case. The two ends of the harmonica pipe 7 are respectively inserted into the fuel inlet pipe 10 and the fuel outlet pipe 1. The fuel front baffle plate 8 and the fuel rear baffle plate 2 are uniformly provided with a plurality of oval holes which are respectively matched with oval holes on the pipe walls of the fuel inlet pipe 10 and the fuel outlet pipe 1. The cylinder type fuel inlet and outlet pipe 10, the harmonica pipe 7 and the fuel front side baffle plate 8 are all connected through brazing, and the harmonica pipe 7 of the fuel outlet pipe 1 and the fuel rear side baffle plate 2 are all connected through brazing to form an internal low-temperature fuel flow passage. The low-temperature fuel flows in through the fuel inlet 9 at the front side of the lower part of the shell, is uniformly distributed in the bottom flow channel through the internal harmonica pipe 7, flows in the upper flow channel in a countercurrent way through the fuel side rear side partition plate 2 matched with the cylindrical flow channel in a longitudinal arrangement way, and finally flows out through the fuel outlet 17 at the rear side of the upper part of the shell. The fuel inlet and the fuel outlet are diagonally arranged up and down, which is beneficial to the smooth flow of fuel in the internal flow channel and reduces the pressure loss in the flow process; meanwhile, the whole size of the oil cooler can be reduced, and the space is saved; the diagonally-arranged arrangement can also increase the flow path length of the fuel, thereby improving the flow rate of the fuel.

As shown in fig. 2, 3, 4 and 5, the oil outlet pipe 14 and the oil inlet pipe 15 are connected to the oil side end plate 12 by brazing. The baffle plate 5 is positioned in the middle of the harmonica tube 7, the H-shaped soaking plates 6 are symmetrically distributed among the harmonica tubes 7 according to the front side and the rear side of the baffle plate 5, and the H-shaped soaking plates 6 are arranged among the harmonica tubes in an H-shaped multi-group mode. The two wing edge surfaces of the H-shaped soaking plates 6 are respectively contacted with the outer wall surface of the harmonica pipe 7, and the H-shaped soaking plates in the same row are closely contacted and connected by brazing. High-temperature lubricating oil of the inner and outer split-flow type oil cooler flows in through a lubricating oil inlet 16 at the upper part of the shell, flows to a plurality of groups of straight flow channels formed by the H-shaped soaking plates 7 through holes on a lubricating oil inlet pipe 15 and a lubricating oil side end plate 12, enters a flow path separated by a baffle plate 5 at the bottom, flows to a lubricating oil outlet pipe 14 and finally flows out of a lubricating oil outlet 13.

As shown in fig. 5, the baffle plate 5 is provided with a plurality of rows of through holes, each through hole corresponding to one harmonica pipe 7; the role of the baffle 5: the high-temperature lubricating oil flow channels can be separated to form fixed flow paths, so that lubricating oil flows more uniformly in the oil cooler; causing the oil to flow repeatedly as it passes through the baffles, the contact area between the lubricating oil and the outer wall surface of the harmonica pipe and the H-shaped soaking plate is increased, and the heat dissipation efficiency of the lubricating oil is improved; the harmonica tube 7 is fixed in an auxiliary mode, vibration of the harmonica tube 7 under normal working conditions is avoided, and service life of the harmonica tube is prolonged.

The harmonica tube 7 is prepared by a hot extrusion method. The aluminum alloy plate is heated to a certain temperature and then put into an extruder, and the aluminum alloy plate is molded into a required shape through an extrusion die under high pressure. The harmonica pipe 7 is a plate material provided with a plurality of through holes at intervals along the thickness direction; the cross section of the through hole of the harmonica pipe 7 is rectangular, circular or semicircular and the combination thereof; as shown in fig. 6, the through holes in the middle are preferably rectangular, and the through holes at the two ends are preferably semicircular; the distance between the through holes in the harmonica tube is 0.4-0.5mm, preferably 0.45mm; the width of the through hole of the harmonica tube to the outer side edge is 0.4-0.6mm, preferably 0.5mm. The transverse distance between every two adjacent harmonica tubes in the transverse interval arrangement of the harmonica tubes is 12-17mm, preferably 14-15mm; the longitudinal distance between two adjacent harmonica tubes in the longitudinal arrangement of the harmonica tubes is 30-40mm, preferably 34-35mm. The harmonica pipe guides the fuel flowing into the fuel inlet 9 into the internal flow passage of the harmonica pipe, and controls the flow speed and the pressure of the fuel through the flow passage, so that the fuel is promoted to uniformly flow through the internal flow passage of the harmonica pipe, and a better cooling effect is realized; meanwhile, the harmonica pipe also plays a role in shunting, so that the temperature of lubricating oil is further reduced.

As shown in fig. 7 and 8, the H-shaped soaking plate 6 is composed of two side wing plates and a middle waist plate, wherein the thicknesses of the two side wing plates and the middle waist plate are respectively 0.4-0.6mm (preferably 0.5 mm) and 1.5-2.5mm (preferably 2 mm); the thickness of flanges at two sides of the H-shaped soaking plate 6 is 0.4-0.6mm, the total thickness of the middle soaking plate is 2mm, and the thickness of a V-shaped cavity in the soaking plate is 1mm. The H-shaped vapor chamber material is 6A02 grade aluminum alloy. The section of the waist plate of the H-shaped soaking plate 6 is long-strip or V-shaped; the section of the waist plate of the H-shaped soaking plate 6 is preferably V-shaped; particularly, the waist plate of the H-shaped soaking plate 6 is preferably formed by two V-shaped section intervals; a V-shaped inner cavity with the interval of 0.5-1.5mm is formed between the two waist plates, a proper amount of acetone working medium is injected into the cavity, then the waist plates are completely sealed, and reliability test is carried out in a constant-temperature water bath, so that good tightness is ensured. The H-shaped soaking plate 6 has significant advantages in terms of both structural strength and fluid heat transfer. Flanges with equal thickness on two sides of the H-shaped soaking plate 6 are formed by rolling and are connected with the middle soaking plate by brazing, so that the operation is simple and convenient. The H-shaped soaking plate 6 has reasonable cross section shape, high lateral rigidity and high bending resistance, and can make the aluminum alloy section bar exert material efficiency higher and improve the structural bearing capacity. When the high-temperature lubricating oil flows through the H-shaped soaking plate, heat of the high-temperature lubricating oil can be transferred to flanges at two sides of the H-shaped soaking plate, and then the heat is transferred to the low-temperature fuel oil through the wall surface of the harmonica through the surface with large contact area between the flange of the H-shaped soaking plate and the outer wall surface of the harmonica. Therefore, the temperature difference between the high-temperature lubricating oil and the low-temperature fuel oil is reduced, and the efficiency and the stability of the system are improved. The function of the V-shaped cavity in the H-shaped soaking plate is as follows: the heat exchange contact area is improved, the heat can be more uniformly dispersed to the surface of the soaking plate, and the generation of hot spots and cold spots is reduced; the working medium in the V-shaped cavity is converged at the low side under the action of gravity, and the convergence and flow of the working medium are beneficial to uniform heat distribution and improve the heat management effect. In addition, the H-shaped soaking plate structure remarkably improves the heat transfer intensity, enhances the heat transfer, improves the overall heat transfer efficiency of the oil cooler, and simultaneously promotes the temperature difference of the lubricating oil at the front end and the rear end of the lubricating oil flowing through the soaking plate to be reduced due to the good temperature equalizing effect of the lubricating oil, so that the temperature equalizing effect is improved.

As shown in fig. 10 and 11, 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; compared with other pipelines such as rectangular pipelines, the cylinder type pipeline has the remarkable advantages that the cylinder type pipeline is uniformly stressed in all directions, when fluid is injected into the cylinder type pipeline of the inner tube side and the outer shell side at the designed flow rate, the impact loads stressed in all directions are consistent, and the integral structural strength and the service life of the oil cooler are improved. The outlets of the fuel outlet pipe 1 and the lubricating oil outlet pipe 14 are respectively provided with a fuel outlet pipe plug 1-1 and a lubricating oil outlet pipe plug 14-1.

According to the oil cooler disclosed by the invention, the front side and the rear side of the oil cooler shell are respectively and vertically provided with a plurality of cylinders in parallel, the front end and the rear end of the harmonica pipe are inserted into the cylinder structure to be fixed, the upper cylinder and the lower cylinder are connected through the fuel side baffle plate, and the contact surface of the cylinder and the fuel side baffle plate is provided with elliptical holes for fuel to uniformly flow in.

An internal and external split-flow type oil cooler working process comprises the following steps: injecting low-temperature fuel into the cylindrical fuel inlet pipe, uniformly distributing the low-temperature fuel into the bottom flow channel through the inner harmonica pipe, flowing back into the upper flow channel through longitudinally arranged fuel side partition boards (a fuel front partition board 8 and a fuel rear partition board 2) matched with the cylindrical flow channel, and finally flowing out through the cylindrical fuel outlet pipe at the upper part of the shell; meanwhile, high-temperature lubricating oil flows in through a cylindrical lubricating oil inlet pipe at the upper part of the box body and flows out from a cylindrical outlet pipe through a long and narrow runner formed by the H-shaped soaking plate. The fuel oil and the lubricating oil which pass through the oil cooler flow back to the engine and the lubricating system respectively, thereby ensuring the normal operation of the engine and the lubricating system. The low-temperature fuel oil and the high-temperature lubricating oil flow channels are not mutually interfered, and the heat exchange is realized through the wall surface of the harmonica on the premise of ensuring the safe operation of the oil cooler, so that the aim of efficiently cooling the lubricating oil is fulfilled. In the process, the inner flow channels and the outer flow channels are arranged in a staggered way, the harmonica pipe is inserted into the cylindrical flow channel pipe structure to be fixed, vibration is prevented, and the structures such as the baffle plate and the H-shaped soaking plate play roles in controlling fluid flow, transferring heat and the like, so that the oil cooler can effectively cool fuel oil and lubricating oil.

The oil inlet and outlet of the invention adopts an elliptic special-shaped flange plate to be in threaded connection with the cylinder type oil inlet and outlet pipe.

The fuel inlet and the lubricant inlet and outlet are arranged in a countercurrent mode, low-temperature fuel enters from bottom to top, and high-temperature lubricant flows from top to bottom.

The oil cooler is made of 6A02-T4 grade aluminum alloy.

The inside and outside split-flow type oil cooler adopts a plurality of groups of harmonica pipes and the H-shaped soaking plate structure, and the structure effectively increases the heat conduction area and improves the heat exchange efficiency of the oil cooler, so that lubricating oil can be effectively cooled and fuel oil can be heated, and a good heat exchange effect is achieved. Meanwhile, the harmonica pipes are longitudinally arranged, and the middle waist plates of the H-shaped soaking plates are also longitudinally designed, in particular, the two side wing plates of each H-shaped soaking plate are welded with the harmonica pipes, a plurality of H-shaped soaking plates are continuously arranged between two rows of harmonica pipes, the H-shaped soaking plates are longitudinally arranged in cooperation with the harmonica pipes, and the heat exchange core body forms a longitudinal and transverse runner reticular arrangement structure which is almost similar to a solid structure, so that the heat exchange core body has extremely high pressure bearing capacity.

Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims

1. An internal and external split-type oil cooler is characterized by comprising a heat exchange core body; the heat exchange core body mainly comprises an H-shaped vapor chamber, harmonica pipes and baffle plates; the harmonica tube is provided with a plurality of harmonica tubes; the cross section of each harmonica pipe is uniformly provided with a plurality of through holes at uniform intervals; each harmonica tube is vertically arranged; the harmonica tubes are transversely arranged at intervals to form a longitudinal row; the harmonica tubes are longitudinally arranged at intervals; the H-shaped soaking plates are provided with a plurality of H-shaped soaking plates, each H-shaped soaking plate is formed by longitudinally connecting two side wing plates and a middle waist plate, the two side wing plates of each H-shaped soaking plate are welded with the harmonica tubes, and the H-shaped soaking plates are continuously arranged between two rows of harmonica tubes; the fuel oil inlet pipes and the fuel oil outlet pipes are respectively arranged at two sides of the heat exchange core body, and two adjacent fuel oil inlet pipes and two adjacent fuel oil outlet pipes are connected through a fuel oil front side baffle plate and a fuel oil rear side baffle plate which are provided with a plurality of upper and lower through holes at intervals; openings are arranged at intervals between each fuel inlet pipe and each plurality of fuel outlet pipes, the baffle plates are provided with openings according to the distribution of the harmonica pipes, the baffle plates are vertically arranged at the middle parts of the H-shaped soaking plates, and gaps are formed between the bottoms of the baffle plates and the bottoms of the heat exchange cores; each harmonica pipe penetrates through the opening of the baffle plate, and two ends of each harmonica pipe are respectively inserted into the openings of the fuel inlet pipe and the fuel outlet pipe; a fuel inlet pipe at the bottom end or the top end is connected with the fuel inlet, and a fuel outlet pipe at the top end or the bottom end is connected with the fuel outlet; two sides of the heat exchange core body between the fuel inlet pipe and the fuel outlet pipe are respectively provided with a fuel inlet side end plate and a fuel front side baffle plate; the top and the bottom of the heat exchange core body are respectively provided with an oil side end plate and a lower end plate; the two sides of the end plate on the lubricating oil side are respectively provided with a lubricating oil inlet pipe and a lubricating oil outlet pipe, and one ends of the lubricating oil inlet pipe and the lubricating oil outlet pipe are respectively connected with the lubricating oil inlet and the lubricating oil outlet; through holes for communicating pipelines are formed at the bottoms of the lubricating oil inlet pipe and the lubricating oil outlet pipe at intervals; the oil side end plate is provided with openings communicated with the heat exchange core body according to the distribution of the through holes in the oil inlet and the oil outlet.

2. The split-flow oil cooler according to claim 1, wherein the harmonica tube is a plate material provided with a plurality of through holes at intervals in a thickness direction.

3. The oil cooler according to claim 1 or 2, wherein the cross-section of the through hole of the mouth organ pipe is rectangular, circular or semicircular, and combinations thereof.

4. The internal and external split-type oil cooler according to claim 3, wherein the through holes are rectangular, and the through holes at both ends are semicircular; the distance between the through holes in the harmonica tube is 0.4-0.5mm, and the width from the through holes of the harmonica tube to the outer side edge is 0.4-0.6mm.

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

6. The split-flow oil cooler according to claim 1, wherein the thickness of the wing plates at both sides and the middle waist plate of the H-shaped soaking plate is 0.4-0.6mm and 1.5-2.5mm, respectively.

7. The split-flow oil cooler according to claim 6, wherein the waist plate of the H-shaped soaking plate has a long strip shape or a V-shape in cross section.

8. The internal and external split-type oil cooler according to claim 7, wherein the waist plates of the H-shaped soaking plates are formed by two V-shaped section intervals; a V-shaped inner cavity with the interval of 0.5-1.5mm is formed between the two waist plates, and acetone working medium is injected into the cavity.

9. The split-flow type oil cooler according to claim 1, wherein the cylindrical fuel inlet and outlet pipe, the harmonica pipe and the fuel front side baffle are all connected by brazing, and the harmonica pipe of the fuel outlet pipe and the fuel rear side baffle are all connected by brazing.

10. The internal and external split-type oil cooler according to claim 1, wherein the internal and external split-type oil cooler is made of 6A02-T4 grade aluminum alloy.