CN110925097B - Low-flow-resistance compact precooler and manufacturing method thereof - Google Patents
Low-flow-resistance compact precooler and manufacturing method thereof Download PDFInfo
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- CN110925097B CN110925097B CN201911046127.6A CN201911046127A CN110925097B CN 110925097 B CN110925097 B CN 110925097B CN 201911046127 A CN201911046127 A CN 201911046127A CN 110925097 B CN110925097 B CN 110925097B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/12—Cooling of plants
- F02C7/14—Cooling of plants of fluids in the plant, e.g. lubricant or fuel
- F02C7/141—Cooling of plants of fluids in the plant, e.g. lubricant or fuel of working fluid
- F02C7/143—Cooling of plants of fluids in the plant, e.g. lubricant or fuel of working fluid before or between the compressor stages
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P2700/00—Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
- B23P2700/01—Aircraft parts
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- General Engineering & Computer Science (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
- Mounting Of Bearings Or Others (AREA)
Abstract
The invention relates to a low-flow-resistance high-efficiency compact precooler structure and a manufacturing method thereof. The structure comprises an air inlet flow guide cover, an air inlet support cover, a heat exchange tube, a partition plate cover, a force bearing column, a spacer sleeve, a support cover, an end face flow guide cover, a sewing screw, a sewing nut and a locking nut. According to the heat exchange power, the cooled working medium, the inlet and outlet parameters of the cooled working medium and the like, the structural size parameters and the assembly tightening torque of the parts are determined, on the basis of completing the manufacture of the parts, the assembly of the heat exchange tube and the supporting cover, the assembly of the supporting cover and the end surface flow guide cover and the assembly of the bearing column, the supporting cover and the end surface flow guide cover are firstly carried out, the assembly of the partition plate cover, the spacer sleeve, the heat exchange tube and the bearing column is secondly carried out, then the assembly of the air inlet supporting cover, the heat exchange tube and the bearing column is carried out, and finally the assembly of the air inlet flow guide cover, the air inlet supporting cover and the bearing. The structure has the characteristics of small flow resistance, high power density, low manufacturing difficulty, reliable structure and the like.
Description
Technical Field
The invention belongs to the technical field of precooling power, and particularly relates to a low-flow-resistance efficient compact precooler structure and a manufacturing method thereof.
Background
The precooling engine is characterized in that incoming flow gas at the inlet of an air compressor is precooled by a precooler and related components and systems thereof, so that the gas temperature at the inlet of the air compressor is reduced, the mass flow of the gas at the inlet of the air compressor is improved, the efficient working range of the air compressor is widened, the engine can meet the power demand of an aircraft under a high-speed condition, and the precooling engine is one of important development directions of the power of an aerospace aircraft.
The precooler is used as the most core component of the precooling engine and plays an important role in widening the working speed range of the engine and improving performance parameters such as the thrust-weight ratio of the engine. In order to meet the engineering application requirements of the precooling engine, a precooler used by the precooling engine needs to have the characteristics of high heat exchange power, high power density, light weight, high compactness, low flow resistance and the like. In the working process of the precooler, high-temperature air is arranged on one side, low-temperature working medium is arranged on the other side, the working temperature gradient is large, the working load environment is complex, and particularly under the high-Mach number flight condition of an aircraft, the working environment of the precooler becomes severer and bears the high-speed impact of high-temperature and high-pressure incoming flow air. Therefore, the precooler is required to have good heat exchange performance and high reliability, and the efficient heat exchange performance of the precooler can be ensured to be effectively exerted.
The existing precooler generally adopts an annular structure formed by assembling microtube diaphragm heat exchange units, and specifically comprises the following steps: firstly, cutting a micro-tube according to a design size and forming the micro-tube into a shape characteristic with an involute; then, dozens or even hundreds of micro-tubes with the same diameter are welded together with the gas collecting tube, the support plate and the like through a welding process to form a heat exchange membrane unit of the precooler; and finally, assembling a plurality of heat exchange membrane units together to form a complete precooler structure. In the existing precooler structure, cooled air enters the precooler from outside to inside along the radial direction, and a cooling working medium enters the interior of a micro-fine tube in the precooler from a gas collecting tube on one side of a heat exchange membrane unit close to the center and flows out from a gas collecting tube on the outer side. Although the existing precooler structure can realize high-efficiency heat exchange and has the characteristics of high compactness, high power density and the like, the flow resistance of the precooler is larger because the cooled air enters the precooler along the radial direction and is vertical to the axis and flows out along the axial direction; meanwhile, the manufacturing difficulty and the cost of the precooler are high because a more complex forming process needs to be carried out on the microtube and the membrane unit needs to be welded and assembled; in addition, the precooler is connected with an external cooling working medium pipeline through the gas collecting pipes on the plurality of heat exchange membrane units, so that the peripheral connecting pipeline of the precooler is complex, the number of sealing parts is large, the volume and the weight are large, and the structural reliability of the precooler is not facilitated.
Aiming at the requirements of a precooler on high-efficiency heat exchange, high power density, low flow resistance, high reliability and the like of a precooler by a precooling engine, the heat exchange structure of the precooler is reasonably designed, the circulation paths of cooled gas and a cooling working medium are optimized, the external connection interface of the precooler is simplified, the manufacturing difficulty of the precooler is reduced, and the high performance and the high reliability of the precooler are realized.
Disclosure of Invention
In view of the above, the invention provides a low flow resistance compact precooler and a manufacturing method thereof. According to the parameters of heat exchange power of the precooler, inlet and outlet temperature and pressure of a cooled working medium and the like, the structural size parameters and the screw thread assembly tightening torque of components and parts formed by the precooler are determined, on the basis of completing the manufacture of the components and parts, the assembly of the heat exchange tube and the supporting cover, the assembly of the bearing cover and the end surface flow guide cover, the assembly of the bearing column and the supporting cover, the assembly of the partition plate cover, the spacer sleeve, the heat exchange tube and the bearing column, the assembly of the air inlet supporting cover, the heat exchange tube and the bearing column, and the assembly of the air inlet flow guide cover, the air inlet supporting cover and the bearing column are performed, so that a complete precooler structure is formed, and the precooler has the characteristics of compact structure.
A low flow resistance compact precooler structure comprises an air inlet flow guide cover, an air inlet support cover, a heat exchange tube, a partition plate cover, a bearing column, a spacer sleeve, a support cover, an end surface flow guide cover, a sewing screw, a sewing nut and a locking nut; the air inlet guide cover is of a conical structure, the outer conical surface of the air inlet guide cover is provided with a gas collecting pipeline for cooling working media to enter and exit the precooler, the inner conical surface of the air inlet guide cover is provided with guide grooves, annular convex edges between the guide grooves of the air inlet guide cover and an annular groove of the air inlet support cover are installed in a matched mode, and through holes assembled with the force bearing columns and the sewing screws are formed in the end face of the inner edge and the end face of the outer edge of the air inlet guide cover;
the air inlet support cover is of a conical structure, the conical surface of the air inlet support cover is provided with through holes assembled with the heat exchange tubes, the outer conical surface of the air inlet support cover is provided with annular grooves, the number of rows of the heat exchange tubes spaced among the annular grooves can be determined by the annular grooves of the air inlet support cover according to the flow requirement of a cooling working medium, and the inner edge end surface and the outer edge end surface of the air inlet support cover are provided with through holes assembled with bearing columns and sewing screws;
the heat exchange tubes are arranged on the air inlet support cover, the partition plate and the support cover, the heat exchange tubes are micro tubes with different diameters, the diameters of the heat exchange tubes are gradually increased along the radial direction of the precooler according to the flow guide requirement of a cooling working medium, and the heat exchange tubes are arranged along the radial direction of the precooler in a cross arrangement mode; the baffle plate cover is of a conical structure, the conical surface of the baffle plate cover is provided with through holes assembled with the heat exchange tube, and the inner edge end surface and the outer edge end surface of the baffle plate cover are provided with through holes assembled with the bearing columns;
the bearing column is a variable cross-section rod, the shorter end of the bearing column is a rod which is assembled with the end face through holes of the supporting cover and the end face flow guide cover and is provided with a section of thread at the end part, the longer end of the bearing column is a rod which is assembled with the end face through holes of the partition plate cover, the spacing sleeve, the air inlet supporting cover and the air inlet flow guide cover and is provided with a section of thread at the end part, and the diameter of the middle polished rod of the bearing column is larger than the diameters of the inner edge end faces and the outer edge end face through holes of the supporting cover and; the center of the spacer sleeve is provided with a through hole which is assembled with a polish rod of the bearing column, and the spacer sleeve is arranged on the bearing column and between the clapboard cover or the air inlet supporting cover;
the conical surface of the supporting cover is provided with through holes assembled with the heat exchange tubes, the inner conical surface of the supporting cover is provided with annular grooves, the number of rows of heat exchange tubes spaced between the annular grooves can be determined by the annular grooves of the supporting cover according to the flow requirement of a cooling working medium, and the inner edge end surface and the outer edge end surface of the supporting cover are provided with through holes assembled with bearing columns and sewing screws;
the end surface flow guide cover is of a conical structure, the outer conical surface of the end surface flow guide cover is provided with flow guide grooves, annular convex edges between the flow guide grooves of the end surface flow guide cover and an annular groove of the support cover are installed in a matched mode, and through holes assembled with the force bearing columns and the sewing screws are formed in the end surface of the inner edge and the end surface of the outer edge of the end surface flow guide cover;
the stitching screw is arranged in through holes of the end surface flow guide cover, the end surface of the end surface support cover, the air inlet flow guide cover and the end surface of the inner edge and the end surface of the outer edge of the air inlet support cover; the suture nut is arranged on the suture screw; the locking nut is arranged on the threaded section of the polished rod of the bearing column.
A method of manufacturing a low flow resistance compact precooler, comprising the steps of:
a. determining the structural dimension parameters and the thread assembling torque of the precooler and the components thereof: determining structural size parameters of the precooler and components thereof according to parameters such as heat exchange power of the precooler, inlet and outlet temperature and pressure of a cooled working medium, inlet and outlet temperature and pressure of the cooled working medium and the like, and determining tightening torque of a sewing nut and a locking nut according to sealing and structural strength requirements;
b. manufacturing of the components of the precooler: b, manufacturing an air inlet flow guide cover, an air inlet support cover, a heat exchange tube, a partition plate cover, a bearing column, a spacer sleeve, a support cover, an end face flow guide cover, a sewing screw, a sewing nut and a locking nut of the precooler according to the structural size parameters of the precooler determined in the step a;
c. assembling the heat exchange tube and the supporting cover: the heat exchange tube is arranged in the through hole of the supporting cover in a welding mode, so that the end face of the heat exchange tube is aligned with the inner conical surface of the supporting cover;
d. assembling the support cover and the end surface flow guide cover: respectively attaching the inner conical surface and the end surface of the supporting cover to the outer conical surface and the end surface of the end surface flow guide cover, matching the annular convex edge between the flow guide grooves of the end surface flow guide cover and the annular groove of the supporting cover, aligning the through holes of the inner edge end surface and the outer edge end surface of the supporting cover and the end surface flow guide cover, penetrating the sewing screw through the through holes of the inner edge end surface and the outer edge end surface of the supporting cover and the end surface flow guide cover, installing the sewing nut on the sewing screw, and screwing down according to the moment determined in the step a to realize fastening;
e. assembling the bearing column with the supporting cover and the end surface flow guide cover: b, mounting the shorter end of the bearing column in through holes of the inner edge end face and the outer edge end face of the support cover and the end face flow guide cover, mounting a locking nut on an external thread of the shorter end of the bearing column, and screwing down and fixing according to the moment determined in the step a;
f. assembling the partition plate cover and the spacer sleeve with the heat exchange tube and the bearing column: sequentially enabling through holes assembled with the heat exchange tube on the conical surface of the partition plate cover to penetrate through the heat exchange tube, enabling the through holes on the inner edge end surface and the outer edge end surface of the partition plate cover to penetrate through the bearing column, and then installing the spacer sleeves on the bearing column;
g. assembling the air inlet supporting cover, the heat exchange tube and the bearing column: the through hole assembled with the heat exchange tube on the conical surface of the air inlet supporting cover penetrates through the heat exchange tube, meanwhile, the through holes on the inner edge end surface and the outer edge end surface of the air inlet supporting cover penetrate through the bearing column, and the assembly between the conical surface through hole of the air inlet supporting cover and the heat exchange tube is realized by adopting a welding mode;
h. assembling the air inlet flow guide cover, the air inlet bearing cover and the bearing column: respectively attaching the outer conical surface and the end surface of the air inlet bearing cover to the inner conical surface and the end surface of the air inlet guide cover, enabling the annular convex edge between the guide grooves of the air inlet guide cover to be matched with the annular groove of the air inlet bearing cover, enabling the through holes of the inner edge end surface and the outer edge end surface of the air inlet guide cover to penetrate through the bearing column, then installing the locking nut on the bearing column, screwing up according to the moment determined in the step a, finally enabling the sewing screw to penetrate through the through holes of the inner edge end surface and the outer edge end surface of the air inlet bearing cover and the air inlet guide cover, installing the sewing nut on the sewing screw, and screwing up according to the moment determined in the.
Has the advantages that:
according to the low-flow-resistance compact precooler structure and the manufacturing process thereof, the micro-fine tubes with different diameters are adopted, so that the heat exchange efficiency and the power density of the precooler can be improved, and the flow resistance of a cooling working medium can be effectively reduced; the air inlet support cover, the partition plate cover and the support cover adopt conical surface structures, so that the flow resistance of the cooled working medium in the precooler can be effectively reduced, and the flow loss of the cooled working medium entering the precooler from the air inlet channel through the precooler is reduced; the partition plate cover can improve the reliability of the precooler structure and prevent the heat exchange tube from resonating under the excitation of external loads such as air flow impact of a cooled working medium and the like; the outer conical surface of the air inlet guide cover is provided with a gas collecting pipeline for the cooling working medium to enter and exit the precooler, so that the cooling working medium can enter and exit the precooler in a centralized manner, the interfaces of the inlet and outlet pipelines are reduced, and the flowing uniformity of the cooling working medium entering the precooler is improved; the structure of the bearing column and the spacer sleeve is adopted, so that the structural strength of the precooler can be improved, and the assembly is convenient; the precooler has fewer welding parts, can effectively reduce the manufacturing difficulty of the precooler and realize high reliability
Drawings
Fig. 1 is a schematic structural diagram of a low-flow-resistance compact precooler according to an embodiment of the invention.
Fig. 2 is a schematic structural diagram of an air inlet deflector according to an embodiment of the invention.
FIG. 3 is a schematic view of an intake support shroud according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a partition board cover according to an embodiment of the invention.
Fig. 5 is a schematic structural view of the bearing column in the embodiment of the invention.
Fig. 6 is a schematic structural diagram of a spacer sleeve according to an embodiment of the present invention.
Fig. 7 is a schematic structural view of a support cover according to an embodiment of the present invention.
Fig. 8 is a schematic structural view of the end-face deflector cover according to the embodiment of the present invention.
Wherein: 1 air inlet flow guide cover 2 air inlet support cover 3 heat exchange tube 4 baffle cover 5 force bearing column 6 spacer sleeve 7 support cover 8 end surface flow guide cover 9 suture screw 10 suture nut 11 locknut 12 cooling working medium flow in collector 13 cooling working medium flow out collector 14 air inlet flow guide cover cone through hole 15 air inlet flow guide cover inner edge end surface and outer edge end surface through hole 16 air inlet support cover cone through hole 17 air inlet support cover ring groove 18 air inlet support cover inner edge end surface and outer edge end surface through hole 19 baffle cover cone through hole 20 baffle cover inner edge end surface and outer edge end surface through hole 21 force bearing column shorter threaded rod 22 force bearing column long strip threaded rod 23 force bearing column middle polish rod 24 spacer sleeve through hole 25 support cover cone through hole 26 support cover ring groove 27 support cover inner edge end surface and outer edge end surface through hole 28 end surface flow guide cover 29 end surface flow guide cover inner edge end surface through hole.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
As shown in the attached figure 1, the invention provides a low-flow-resistance compact precooler structure, which comprises an air inlet flow guide cover 1, an air inlet support cover 2, a heat exchange tube 3, a partition plate cover 4, a force bearing column 5, a spacer sleeve 6, a support cover 7, an end surface flow guide cover 8, a sewing screw 9, a sewing nut 10 and a locking nut 11; as shown in fig. 2, the air inlet flow guide cover 1 is of a conical structure, the outer conical surface of the air inlet flow guide cover 1 is provided with air collecting pipelines 12 and 13 for cooling working medium to enter and exit the precooler, the inner conical surface of the air inlet flow guide cover 1 is provided with flow guide grooves 14, annular convex edges between the flow guide grooves of the air inlet flow guide cover 1 and annular grooves of the air inlet support cover 2 are installed in a matching manner, and the inner edge end surface and the outer edge end surface of the air inlet flow guide cover 1 are provided with through holes 15 assembled with bearing columns and sewing screws;
as shown in fig. 3, the air inlet support cover 2 is a conical structure, the conical surface of the air inlet support cover 2 is provided with through holes 16 assembled with heat exchange tubes, the outer conical surface of the air inlet support cover 2 is provided with annular grooves 17, the number of rows of heat exchange tubes spaced between the annular grooves can be determined by the annular grooves of the air inlet support cover 2 according to the flow requirement of a cooling working medium, and the inner edge end surface and the outer edge end surface of the air inlet support cover 2 are provided with through holes 18 assembled with bearing columns and sewing screws;
the heat exchange tubes 3 are arranged on the air inlet support cover 2, the partition plate 4 and the support cover 7, the heat exchange tubes 3 are micro tubes with different diameters, the diameters of the heat exchange tubes 3 are gradually increased along the radial direction of the precooler according to the flow guide requirement of a cooling working medium, and the heat exchange tubes 3 are arranged along the radial direction of the precooler in a cross arrangement mode;
as shown in fig. 4, the partition plate cover 4 is a conical structure, a through hole 19 assembled with the heat exchange tube 3 is formed in the conical surface of the partition plate cover 4, and through holes 20 assembled with the bearing columns are formed in the end surfaces of the inner edge and the outer edge of the partition plate cover 4;
as shown in fig. 5, the bearing column 5 is a variable cross-section rod, the shorter end 21 of the bearing column 5 is a rod which is assembled with the end face through holes of the support cover and the end face deflector cover and has a section of screw thread at the end, the longer end 22 of the bearing column 5 is a rod which is assembled with the end face through holes of the partition plate cover 4, the spacer sleeve 6, the air inlet support cover 2 and the air inlet deflector cover 1 and has a section of screw thread at the end, and the diameter of the middle polish rod 23 of the bearing column 5 is larger than the diameters of the inner edge end face and outer edge end face through holes of the support cover and the partition plate cover;
as shown in fig. 6, the center of the spacer 6 is provided with a through hole 24 which is assembled with the bearing column 5, and the spacer 6 is arranged on the bearing column 5 and between the clapboard cover 4 or the air inlet supporting cover 2;
as shown in fig. 7, the conical surface of the supporting cover 7 is provided with through holes 25 assembled with the heat exchange tubes, the inner conical surface of the supporting cover 7 is provided with annular grooves 26, the number of rows of heat exchange tubes spaced between the annular grooves can be determined by the annular grooves of the supporting cover 7 according to the flow requirement of the cooling working medium, and the inner edge end surface and the outer edge end surface of the supporting cover 7 are provided with through holes 27 assembled with bearing columns and sewing screws;
as shown in fig. 8, the end surface flow guiding cover 8 is a conical structure, the outer conical surface of the end surface flow guiding cover 8 is provided with flow guiding grooves 28, annular convex edges between the flow guiding grooves of the end surface flow guiding cover 8 are matched and installed with annular grooves of the supporting cover, and the inner edge end surface and the outer edge end surface of the end surface flow guiding cover 8 are provided with through holes 29 assembled with the force bearing columns 5 and the sewing screws 9;
the stitching screw 9 is arranged in through holes of the end surface flow guide cover 8, the support cover 7, the air inlet flow guide cover 1 and the air inlet support cover 2 on the inner edge end surface and the outer edge end surface; the suture nut 10 is arranged on the suture screw 9; the locking nut 11 is arranged on the threaded section of the polish rod of the bearing column 5.
A method of manufacturing a low flow resistance compact precooler, comprising the steps of:
a. determining the structural dimension parameters and the thread assembling torque of the precooler and the components thereof: determining structural size parameters of the precooler and components thereof according to parameters such as heat exchange power of the precooler, inlet and outlet temperature and pressure of a cooled working medium, inlet and outlet temperature and pressure of the cooled working medium and the like, and determining tightening torque of a sewing nut and a locking nut according to sealing and structural strength requirements; for example, in order to reduce retention of a precooler, the conical surface angles of an air inlet supporting cover, a partition plate cover and a supporting cover of the precooler are determined to be 90 degrees, and the screwing torque of a sewing nut and a locking nut is determined to be 60 N.m for the heat exchange power, the air inlet and outlet parameters and the cooling working medium inlet and outlet parameters of a precooler of a certain precooling engine.
b. Manufacturing of the components of the precooler: b, manufacturing an air inlet flow guide cover 1, an air inlet support cover 2, a heat exchange tube 3, a partition plate cover 4, a force bearing column 5, a spacer bush 6, a support cover 7, an end surface flow guide cover 8, a sewing screw 9, a sewing nut 10 and a locking nut 11 of the precooler according to the structural size parameters of the precooler determined in the step a; (ii) a
c. The assembly of the heat exchange tube 3 and the support cap 7 is carried out: the heat exchange tube 3 is arranged in the through hole 25 of the supporting cover 7 in a welding mode, so that the end surface of the heat exchange tube 3 is aligned with the inner conical surface of the supporting cover 7;
d. assembling the support cover 7 and the end surface flow guide cover 8: respectively attaching the inner conical surface and the end surface of the supporting cover 7 to the outer conical surface and the end surface of the end surface flow guide cover 8, matching the annular convex edge between the flow guide grooves of the end surface flow guide cover 8 with the annular groove 26 of the supporting cover 7, aligning the through holes of the inner edge end surface and the outer edge end surface of the supporting cover 7 and the end surface flow guide cover 8, penetrating the sewing screw 9 through the through holes of the inner edge end surface and the outer edge end surface of the supporting cover 7 and the end surface flow guide cover 8, installing the sewing nut 10 on the sewing screw 9, and screwing according to the moment determined in the step a to realize fastening;
e. assembling the bearing column 5 with the supporting cover 7 and the end surface flow guide cover 8: b, mounting the shorter end 21 of the bearing column 5 in through holes of the inner edge end face and the outer edge end face of the support cover 7 and the end face flow guide cover 8, mounting a locking nut 11 on the external thread 21 of the shorter end of the bearing column 5, and screwing down according to the moment determined in the step a for fixing;
f. assembling the partition plate cover 4 and the partition sleeve 6 with the heat exchange tube 3 and the bearing column 5: sequentially enabling through holes 19 assembled with the heat exchange tubes on the conical surfaces of the partition plate covers 4 to penetrate through the heat exchange tubes 3, enabling through holes 20 on the inner edge end surfaces and the outer edge end surfaces of the partition plate covers 4 to penetrate through the bearing columns 5, and then installing the spacer bushes 6 on the bearing columns 5;
g. assembling the air inlet supporting cover 2, the heat exchange tube 3 and the bearing column 5: a through hole 16 assembled with the heat exchange tube on the conical surface of the air inlet supporting cover 2 penetrates through the heat exchange tube 3, meanwhile, through holes 18 on the inner edge end surface and the outer edge end surface of the air inlet supporting cover 2 penetrate through the bearing column 5, and the assembly between the through hole 16 on the conical surface of the air inlet supporting cover 2 and the heat exchange tube 3 is realized by adopting a welding mode;
h. assembling the air inlet flow guide cover 1, the air inlet support cover 2 and the bearing column 5: respectively attaching the outer conical surface and the end surface of the air inlet support cover 2 to the inner conical surface and the end surface of the air inlet guide cover 1 tightly, enabling the annular convex edges between the guide grooves 14 of the air inlet guide cover 1 to be matched with the annular groove 17 of the air inlet support cover 2, enabling the through holes 15 of the inner edge end surface and the outer edge end surface of the air inlet guide cover 1 to penetrate through the bearing column 5, then installing the locking nut 11 on the bearing column 5, screwing up according to the moment determined in the step a, finally enabling the sewing screw 9 to penetrate through the through holes of the inner edge end surface and the outer edge end surface of the air inlet support cover 2 and the air inlet guide cover 1, installing the sewing nut 10 on the sewing screw 9, and screwing up according to the moment determined.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A low flow resistance compact precooler structure which characterized in that: the device comprises an air inlet flow guide cover (1), an air inlet supporting cover (2), a heat exchange tube (3), a partition plate cover (4), a force bearing column (5), a spacer sleeve (6), a supporting cover (7), an end face flow guide cover (8), a sewing screw (9), a sewing nut (10) and a locking nut (11); the baffle plate cover (4) is of a conical structure, a through hole (19) assembled with the heat exchange tube (3) is formed in the conical surface of the baffle plate cover (4), and through holes (20) assembled with the bearing columns are formed in the end faces of the inner edge and the outer edge of the baffle plate cover (4); the bearing column (5) is a variable cross-section rod, the shorter end (21) of the bearing column (5) is a rod which is assembled with the end face through holes of the bearing cover and the end face flow guide cover and provided with a section of thread at the end part, the longer end (22) of the bearing column (5) is a rod which is assembled with the end face through holes of the partition plate cover (4), the spacer sleeve (6), the air inlet bearing cover (2) and the air inlet flow guide cover (1) and provided with a section of thread at the end part, and the diameter of the middle polished rod (23) of the bearing column (5) is larger than the diameters of the inner edge end faces and the outer edge end face through holes of the bearing cover and the partition plate; the center of the spacer sleeve (6) is provided with a through hole (24) assembled with the bearing column (5), and the spacer sleeve (6) is arranged on the bearing column (5) and between the partition plate cover (4) or the air inlet support cover (2); the sewing screw (9) is arranged in through holes of the end surface flow guide cover (8) and the support cover (7) as well as the inner edge end surface and the outer edge end surface of the air inlet flow guide cover (1) and the air inlet support cover (2); the stitching nut (10) is arranged on the stitching screw (9); the locking nut (11) is arranged on the threaded section of the polish rod of the bearing column (5).
2. A low flow resistance compact precooler structure according to claim 1, wherein: the air inlet flow guide cover (1) is of a conical structure, the outer conical surface of the air inlet flow guide cover (1) is provided with a cooling working medium inflow gas collecting pipe (12) and a cooling working medium outflow gas collecting pipe (13), the inner conical surface of the air inlet flow guide cover (1) is provided with flow guide grooves (14), annular convex edges between the flow guide grooves of the air inlet flow guide cover (1) and an annular groove of the air inlet support cover (2) are installed in a matched mode, and the inner edge end face and the outer edge end face of the air inlet flow guide cover (1) are provided with through holes (15) which are assembled with bearing columns and sewing screws.
3. A low flow resistance compact precooler structure according to claim 1, wherein: the air inlet support cover (2) is of a conical structure, through holes (16) assembled with the heat exchange tubes are formed in the conical surface of the air inlet support cover (2), annular grooves (17) are formed in the outer conical surface of the air inlet support cover (2), the number of rows of the heat exchange tubes spaced among the annular grooves is determined by the annular grooves of the air inlet support cover (2) according to the flow requirement of cooling working media, and through holes (18) assembled with bearing columns and sewing screws are formed in the end faces of the inner edge and the outer edge of the air inlet support cover (2).
4. A low flow resistance compact precooler structure according to claim 1, wherein: the heat exchange tubes (3) are arranged on the air inlet supporting cover (2), the partition plate cover (4) and the supporting cover (7), the heat exchange tubes (3) are micro-tubes with different diameters, the diameters of the heat exchange tubes (3) are gradually increased along the radial direction of the precooler according to the flow guiding requirement of a cooling working medium, and the heat exchange tubes (3) are arranged in a cross arrangement mode along the radial direction of the precooler.
5. A low flow resistance compact precooler structure according to claim 1, wherein: the conical surface of the supporting cover (7) is provided with through holes (25) assembled with the heat exchange tubes, the inner conical surface of the supporting cover (7) is provided with annular grooves (26), the number of rows of the heat exchange tubes spaced between the annular grooves is determined by the annular grooves of the supporting cover (7) according to the flow requirement of a cooling working medium, and the inner edge end surface and the outer edge end surface of the supporting cover (7) are provided with through holes (27) assembled with bearing columns and sewing screws.
6. A low flow resistance compact precooler structure according to claim 1, wherein: the end face flow guide cover (8) is of a conical structure, flow guide grooves (28) are formed in the outer conical surface of the end face flow guide cover (8), annular convex edges between the flow guide grooves of the end face flow guide cover (8) and annular grooves of the supporting cover are installed in a matched mode, and through holes (29) which are assembled with the bearing columns (5) and the sewing screws (9) are formed in the inner edge end face and the outer edge end face of the end face flow guide cover (8).
7. A method for manufacturing a compact precooler with low flow resistance is characterized in that: the method comprises the following steps:
a. determining structural dimension parameters and thread assembling torque of the precooler and components thereof;
b. manufacturing the components of the precooler;
c. assembling the heat exchange tube (3) and the support cover (7): the heat exchange tube (3) is arranged in the through hole (25) of the supporting cover (7) in a welding mode, so that the end face of the heat exchange tube (3) is aligned with the inner conical surface of the supporting cover (7);
d. assembling the support cover (7) and the end surface flow guide cover (8):
e. assembling the bearing column (5) with the supporting cover (7) and the end surface flow guide cover (8):
f. assembling the partition plate cover (4) and the spacer sleeve (6) with the heat exchange tube (3) and the bearing column (5);
g. assembling the air inlet supporting cover (2), the heat exchange tube (3) and the bearing column (5);
h. assembling the air inlet flow guide cover (1), the air inlet support cover (2) and the bearing column (5).
8. A method of manufacturing a low flow resistance compact precooler according to claim 7, wherein: in the step d, the inner conical surface and the end surface of the supporting cover (7) are respectively attached to the outer conical surface and the end surface of the end surface flow guide cover (8), the annular convex edges between the flow guide grooves of the end surface flow guide cover (8) are matched with the annular grooves (26) of the supporting cover (7), the through holes of the inner edge end surface and the outer edge end surface of the supporting cover (7) and the end surface flow guide cover (8) are aligned, the sewing screw (9) penetrates through the through holes of the inner edge end surface and the outer edge end surface of the supporting cover (7) and the end surface flow guide cover (8), the sewing nut (10) is installed on the sewing screw (9), and fastening is realized by screwing according to the moment determined in the step a.
9. A method of manufacturing a low flow resistance compact precooler according to claim 7, wherein: in the step h, the outer conical surface and the end surface of the air inlet supporting cover (2) are respectively attached to the inner conical surface and the end surface of the air inlet flow guide cover (1), the annular convex edges between the flow guide grooves (14) of the air inlet flow guide cover (1) are matched with the annular groove (17) of the air inlet supporting cover (2), the through holes (15) of the inner edge end surface and the outer edge end surface of the air inlet flow guide cover (1) penetrate through the bearing column (5), then the locking nut (11) is installed on the bearing column (5) and screwed up according to the moment determined in the step a, finally the sewing screw (9) penetrates through the through holes of the inner edge end surface and the outer edge end surface of the air inlet supporting cover (2) and the air inlet flow guide cover (1), the sewing nut (10) is installed on the sewing screw (9), and the sewing is screwed up according to the moment determined.
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| CN102959202A (en) * | 2010-07-02 | 2013-03-06 | 埃克森美孚上游研究公司 | Stoichiometric combustion with exhaust gas recirculation and direct contact cooler |
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