CN115326005B - Method, device, equipment and medium for measuring heat exchange pellet micro-channel deformation value - Google Patents
Method, device, equipment and medium for measuring heat exchange pellet micro-channel deformation value Download PDFInfo
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- CN115326005B CN115326005B CN202211258060.4A CN202211258060A CN115326005B CN 115326005 B CN115326005 B CN 115326005B CN 202211258060 A CN202211258060 A CN 202211258060A CN 115326005 B CN115326005 B CN 115326005B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/02—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a press ; Diffusion bonding
- B23K20/023—Thermo-compression bonding
- B23K20/026—Thermo-compression bonding with diffusion of soldering material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/14—Preventing or minimising gas access, or using protective gases or vacuum during welding
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
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Abstract
The embodiment of the application provides a method, a device, equipment and a medium for measuring a deformation value of a micro channel of a heat exchange pellet, wherein the heat exchange pellet comprises a plurality of laminated channel plates, a plurality of micro channels are arranged on the channel plates, and the measuring method comprises the following steps: acquiring a first thickness deformation value before and after welding of the heat exchange core block; dividing the first thickness deformation value by the number of the runner plates, and determining a second thickness deformation value before and after welding of each runner plate; and determining the depth deformation value before and after welding of the micro-channel according to the second thickness deformation value. According to the embodiment of the application, the deformation value of the micro-channel before and after welding of the heat exchange core block can be obtained without carrying out destructive measurement on the heat exchange core block, and the efficiency of measuring the deformation value of the micro-channel is improved.
Description
Technical Field
The application relates to the technical field of heat exchanger experiments, in particular to a method, a device, equipment and a medium for measuring a heat exchange pellet micro-channel deformation value.
Background
A printed circuit board heat exchanger (PCHE) is a novel heat exchanger which can bear high temperature and high pressure, has compact volume and high heat exchange efficiency. The performance of a heat exchange core block in the heat exchanger directly influences the heat exchange performance of the heat exchanger, the heat exchange core block comprises a plurality of stacked heat exchange plates, and a plurality of micro channels are etched on each heat exchange plate.
The main manufacturing process of the heat exchanger comprises micro-channel etching forming and heat exchange core diffusion welding forming, in the micro-channel chemical etching and heat exchange core diffusion welding process, factors such as the manufacturing process level and the like can affect the size of the formed micro-channel, and the influences are directly related to the thermal hydraulic characteristics of the whole heat exchanger, so that the heat exchange performance of the processed heat exchanger deviates from the design point. However, at present, in order to know the size of the micro flow channel after welding, the heat exchange core block needs to be cut by destructive means such as wire cutting, laser cutting and the like, and then the size of the micro flow channel is measured by a high-precision image measuring instrument, so that the structure of the formed core block is damaged, and the heat exchanger cannot be used.
Disclosure of Invention
According to the method, the device, the equipment and the medium for measuring the deformation value of the micro channel of the heat exchange pellet, the deformation value of the micro channel before and after the welding of the heat exchange pellet can be obtained without performing a destructive measuring mode on the heat exchange pellet, and the efficiency of measuring the deformation value of the micro channel is improved.
In a first aspect, an embodiment of the present application provides a method for measuring a deformation value of a micro channel of a heat exchange pellet, where the heat exchange pellet includes a plurality of stacked channel plates, and the channel plates have a plurality of micro channels, and the method includes:
acquiring a first thickness deformation value before and after welding of the heat exchange core block;
dividing the first thickness deformation value by the number of the runner plates, and determining a second thickness deformation value before and after welding of each runner plate;
and determining the depth deformation value before and after welding of the micro-channel according to the second thickness deformation value.
In a second aspect, the embodiment of the application provides a heat exchange pellet microchannel deformation value measuring device, the heat exchange pellet includes a plurality of range upon range of runner plates, has a plurality of microchannels on the runner plate, and measuring device includes:
the obtaining unit is used for obtaining a first thickness deformation value before and after the welding of the heat exchange core block;
the first determining module is used for dividing the first thickness deformation value by the number of the runner plates and determining a second thickness deformation value before and after welding of each runner plate;
and the second determining module is used for determining the depth deformation value before and after the welding of the micro-channel according to the second thickness deformation value.
In a third aspect, an embodiment of the present application provides a measurement apparatus, where the measurement apparatus includes: a processor and a memory storing computer program instructions;
the processor, when executing the computer program instructions, implements the vacuum diffusion welding apparatus control method as shown in the first aspect.
In a fourth aspect, the present application provides a computer-readable storage medium, on which computer program instructions are stored, and when the computer program instructions are executed by a processor, the method for controlling a vacuum diffusion welding apparatus according to the first aspect is implemented.
According to the method, the device, the equipment and the medium for measuring the deformation value of the micro-channel of the heat exchange pellet, the first thickness deformation value before and after welding of the heat exchange pellet is obtained; dividing the first thickness deformation value by the number of the runner plates, and determining a second thickness deformation value before and after welding of each runner plate; and determining the depth deformation values before and after welding of the micro-channel according to the second thickness deformation value, so that the deformation values before and after welding of the micro-channel on the runner plate of the heat exchange core block can be obtained only by directly measuring the thickness deformation values of the heat exchange core block before and after welding, destructive cutting of the heat exchange core block is not needed, the deformation value of the micro-channel on each runner plate is measured, and the measurement efficiency of measuring the deformation values of the micro-channel before and after welding of the heat exchange core block is obviously improved.
Drawings
Other features, objects, and advantages of the present application will become apparent from the following detailed description of non-limiting embodiments thereof, when read in conjunction with the accompanying drawings, in which like or similar reference characters identify the same or similar features.
Fig. 1 is a schematic diagram of a printed circuit plate heat exchanger according to an embodiment of the present disclosure;
FIG. 2 is a schematic flow chart of a method for measuring the deformation value of a micro-channel of a heat exchange pellet provided in an embodiment of the present application;
FIG. 3 is a line graph of experimental data provided by one embodiment of the present application;
fig. 4 is a schematic diagram of a detailed flow of S203 in the method for measuring a deformation value of a micro channel of a heat exchange pellet according to an embodiment of the present application;
fig. 5 is a schematic detailed flowchart of S502 in the control method of the vacuum diffusion welding apparatus according to an embodiment of the present application;
FIG. 6 is a schematic flow chart of a method for measuring the deformation value of the micro-channel of the heat exchange pellet provided in one embodiment of the present application;
FIG. 7 is a schematic flow chart of a method for measuring a deformation value of a micro-channel of a heat exchange pellet according to an embodiment of the present application;
FIG. 8 is a schematic flow chart of a method for measuring the deformation value of the micro-channel of the heat exchange pellet provided in one embodiment of the present application;
FIG. 9 is a schematic flow chart of a method for measuring the deformation value of the micro-channel of the heat exchange pellet provided in one embodiment of the present application;
fig. 10 is a schematic detailed flowchart of S601 in a control method of a vacuum diffusion welding apparatus according to an embodiment of the present application;
FIG. 11 is a schematic structural diagram of a measurement apparatus provided in an embodiment of the present application;
fig. 12 is a schematic hardware structure diagram of a measurement apparatus provided in an embodiment of the present application.
Description of the reference numerals:
1. a pipe box; 2. a heat exchange core block; 2-1, bearing plate pieces; 2-2, a runner plate; 3-1, secondary side inlet connecting pipe; 3-2, a secondary side outlet connecting pipe; 4-1, primary side inlet connection pipe; 4-2, primary side outlet connecting pipe; 5. a runner plate group; 1101. an acquisition module; 1102. a first determination module; 1103. a second determination module; 1201. a processor; 1202. a memory; 1203. a communication interface; 1210 bus line.
Detailed Description
Features and exemplary embodiments of various aspects of the present application will be described in detail below, and in order to make objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are intended to be illustrative only and are not intended to be limiting. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples thereof.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising 8230; \8230;" comprise 8230; "do not exclude the presence of additional identical elements in any process, method, article, or apparatus that comprises the element.
In the prior art, in order to obtain the size of the micro-channel after welding, the heat exchange core block is usually cut by destructive means such as wire cutting, laser cutting and the like, and then the size of the micro-channel is measured by a high-precision image measuring instrument, so that the structure of the formed heat exchange core block is inevitably damaged, and the heat exchanger cannot be used; or the test module with the same thickness is processed, and the size of the micro-channel is obtained by cutting and measuring, but the production cost of the heat exchanger is greatly increased. The applicant finds that the micro-channel deformation caused by chemical etching is relatively small, and mainly considers the micro-channel deformation in the diffusion welding process, and the deformation part of the micro-channel is gradually transferred to two sides under the action of pressure in the diffusion welding process of the heat exchange core block, so that the micro-channel is narrowed and shallower after welding, the whole heat exchange core block is widened and shortened, and the size of the micro-channel after welding deviates from the design value.
Therefore, the invention provides a method, a device, equipment and a medium for measuring the deformation value of the micro-channel of the heat exchange pellet, which can obtain the deformation value of the micro-channel before and after welding of the heat exchange pellet without carrying out destructive measurement on the heat exchange pellet, and improve the efficiency of measuring the deformation value of the micro-channel.
The method for measuring the deformation value of the heat exchange pellet micro-channel can be used for measuring the deformation value of the micro-channel after vacuum diffusion welding in a printed circuit board type heat exchanger.
As shown in fig. 1, the following description will be made with respect to a specific structure of a printed circuit plate heat exchanger to which the method for measuring a micro channel deformation value of a heat exchange pellet can be applied. As shown in fig. 1, the printed circuit board type heat exchanger may include a tube box 1, a heat exchange core block 2, a secondary side inlet connection pipe 3-1, a secondary side outlet connection pipe 3-2, a primary side inlet connection pipe 4-1, a primary side outlet connection pipe 4-2, and the like. The heat exchange core block 2 comprises a runner plate group 5 formed by stacking an upper pressure-bearing plate 2-1, a lower pressure-bearing plate 2-1 and a plurality of runner plates 2-2, wherein the two pressure-bearing plates 2-1 are respectively arranged on the upper surface and the lower surface of the runner plate group 5, each runner plate 2-2 forms a plurality of micro-channels on the runner plate 2-2 in a chemical etching mode, the stacked runner plates 2-2 and the pressure-bearing plates 2-1 are welded together in a vacuum diffusion welding mode to form the heat exchange core block 2, and finally the heat exchange core block 2, the tube box 1, the secondary side inlet connecting tube 3-1, the secondary side outlet connecting tube 3-2, the primary side inlet connecting tube 4-1 and the primary side outlet connecting tube 4-2 are assembled together through assembly welding to form a complete printed circuit plate type heat exchanger.
The chemical etching technology mainly realizes the molding of the micro-flow channel through the partition action of the corrosive and the anticorrosive layer; the diffusion welding process is realized by depending on a vacuum diffusion welding furnace, and the equipment can realize high-vacuum, high-temperature and high-pressure load conditions. Different runner plates that pile up each other are by two upper and lower graphite pressing plate cladding, and vacuum diffusion welds equipment upper portion and has the hydraulic push rod of a certain amount, under control system's precision was controlled, and each hydraulic push rod applys corresponding compressive stress everywhere to the runner plate that piles up. Under the conditions of high temperature and high vacuum environment in a furnace, the microcosmic convex parts of the runner plates which are contacted with each other are subjected to plastic deformation, and the joint parts are gradually enlarged; then under the promotion of high temperature, metal atoms on two sides of the welding interface pass through the interface to diffuse mutually, and a stable welding joint is formed gradually; after a period of continuous heat preservation, the initial interface hole gradually shrinks and disappears, the welding joint area continues to expand, a stable welding area is finally formed, and finally the welding forming of the whole heat exchange core block is completed.
The method for measuring the deformation value of the micro-channel of the heat exchange pellet provided by the embodiment of the application is described in detail by specific embodiments and application scenes thereof with reference to the attached drawings.
Fig. 2 is a schematic flow chart of a method for measuring a deformation value of a micro channel of a heat exchange pellet according to an embodiment of the present disclosure, and as shown in fig. 2, the embodiment of the present disclosure provides a method for measuring a deformation value of a micro channel of a heat exchange pellet, where the heat exchange pellet includes a plurality of stacked channel plates, and each channel plate has a plurality of micro channels, and the method may include:
s201, acquiring a first thickness deformation value before and after welding of the heat exchange core block;
alternatively, in the embodiment of the present application, several stacked runner plates are welded together to form the heat exchange core block by vacuum diffusion welding, wherein as shown in fig. 3, a unit is cut out from the printed circuit plate heat exchanger, and the deformation process of the unit in the vacuum diffusion welding is shown, where the thickness of the unit is the thickness of the runner plate, and the width of the unit is the transverse pitch of the micro flow channel. It can be seen from the figure that, in the vacuum diffusion welding process, the pressure action of the deformed part of the micro-channel gradually shifts to two sides, which finally results in narrowing and narrowing of the welded micro-channel and widening and shortening of the whole unit, and wherein, because the lower part of the micro-channel is a compact metal material, only small deformation is generated in the process of applying pressure stress to the vacuum diffusion welding equipment, so it can be understood that the main deformation occurs in the micro-channel part in the process of applying pressure stress to the vacuum diffusion welding equipment, and therefore, for each layer of channel plate, the deformation caused before and after welding in the pressure applying direction can be considered to be mainly reflected in the change of the depth of the micro-channel. Therefore, for the heat exchange core block consisting of the plurality of layers of runner plates, the total thickness of the core block is measured before and after vacuum diffusion welding, and the total deformation quantity before and after the welding of the heat exchange core block, namely the first thickness deformation value can be obtained.
S202, dividing the first thickness deformation value by the number of the runner plates, and determining a second thickness deformation value before and after welding of each runner plate;
when the first thickness deformation value which is the total deformation amount before and after the welding of the heat exchange core block is obtained, at this time, the deformation amount before and after the welding of each layer of flow channel plate in the thickness direction can be approximately considered to be equal, so that the second thickness deformation value which is the deformation amount before and after the welding of each layer of flow channel plate in the thickness direction can be obtained by dividing the first thickness deformation value which is the thickness deformation amount before and after the total welding of the heat exchange core block by the number of the flow channel plates.
And S203, determining the depth deformation value before and after the welding of the micro-channel according to the second thickness deformation value.
The analysis shows that the deformation of each flow channel plate mainly occurs in the flow channel area in the vacuum diffusion welding process, namely, in the vacuum diffusion welding process, the pressure action of the deformation part of the micro-flow channel gradually transfers to two sides, and finally the micro-flow channel after welding becomes narrow and shallow, so that the deformation value of each flow channel plate before and after welding in the thickness direction is approximately equal to the depth deformation value of the micro-flow channel on each flow channel plate before and after welding, and the depth value of the micro-flow channel after welding can be obtained by subtracting the depth deformation value of the micro-flow channel before and after welding from the depth value of the micro-flow channel before welding. Referring to fig. 3 and fig. 4, the applicant proves through experiments that the depth value of the micro flow channel after welding measured by the above measuring method is equal to the depth value of the micro flow channel after welding measured actually. In the attached figures 4, a, b and c are respectively a welded heat exchange core block (a) containing a single-layer etched runner plate, a welded heat exchange core block (b) containing a 21-layer runner plate and a welded heat exchange core block (c) containing a 127-layer runner plate. The verification results shown in fig. 4 were obtained by measuring welded heat exchanger pellets containing different numbers of flow field plates. As can be seen from fig. 4, as the number of the runner plates included in the heat exchange core block increases, the larger the total thickness change of the heat exchange core block is, the smaller the deviation between the welded depth value of the micro flow channel obtained by the above measurement method and the welded depth value of the micro flow channel measured by the verification test piece is, and as the number of the runner plates increases, the relative deviation between the welded depth value of the micro flow channel obtained by the measurement method of the present application and the welded depth value of the micro flow channel obtained by actual measurement is about 1%. Therefore, the depth deformation value of the micro-channel before and after welding obtained by the measuring method provided by the application is approximately equal to the depth deformation value of the micro-channel before and after welding obtained by actual measurement, and therefore the reliability of the measuring method for the deformation value of the heat exchange pellet micro-channel provided by the application can be verified.
In the embodiment of the application, a first thickness deformation value before and after welding of the heat exchange core block is obtained; dividing the first thickness deformation value by the number of the runner plates, and determining a second thickness deformation value before and after welding of each runner plate; and determining the depth deformation values of the micro-channels before and after welding according to the second thickness deformation value, so that the deformation values of the micro-channels on the runner plates of the heat exchange core block before and after welding can be obtained only by directly measuring the thickness deformation values of the heat exchange core block before and after welding, destructive cutting of the heat exchange core block is not needed, the deformation value of the micro-channel on each runner plate is measured, and the measurement efficiency of measuring the deformation values of the micro-channels before and after welding of the heat exchange core block is obviously improved.
Referring to fig. 5, in an alternative embodiment, S203 includes:
s501, dividing the depth deformation value by the depth value of the micro-channel before the welding of the heat exchange core block, and determining the relative depth change value of the micro-channel.
In one embodiment, the depth variation value before and after welding of the micro flow channel is denoted by σ, the depth value before welding of the micro flow channel is denoted by r, and the two values are divided to obtain the depth relative variation value before and after welding of the micro flow channel:
(1) As will be understood by those skilled in the art, the depth value b = r- σ after the micro flow channel welding can also be obtained by the formula (1), and b is the depth value after the micro flow channel welding.
S502, determining the relative change value of the hydraulic diameter of the micro-channel according to the relative change value of the depth.
Because the heat exchanger needs to be subjected to thermal hydraulic analysis after production, for the micro-channel, the hydraulic diameter as the key geometric dimension of the micro-channel directly depends on the level of the heat exchange capability of the whole heat exchange pellet, and if only the depth deformation values before and after welding of the micro-channel are obtained, the change condition of the hydraulic diameter of the micro-channel in the welding process cannot be obtained. From the above analysis, it can be known that the deformation of the micro flow channel caused by the chemical etching is relatively small, so the influence of the deviation of the cross-sectional dimension of the micro flow channel from the design value after the chemical etching can be ignored, i.e. the dimension of the micro flow channel after the chemical etching is considered to be the design dimension of the micro flow channel, the micro flow channel at this time can be considered to be an ideal semicircle, and the assumed radius value is r, i.e. the depth value before the welding of the micro flow channel. It can be known from the above description that the micro flow channel becomes shallow and wide after vacuum diffusion welding, and the micro flow channel is considered to have become semi-elliptical at this time, assuming that the length of the horizontal half axis is a and the length (depth) of the vertical half axis is b, i.e. the depth value of the micro flow channel after welding, and the hydraulic diameters of the micro flow channel after welding and before welding are respectively a
And
. Then, micro-channel water power before and after weldingThe relative change in diameter is:
according to the analysis of experimental data, the value of a/b is between 0.999 and 1.101, and a can be considered to be>b is approximately true, and b/a ≈ 1, so equation (3) can be obtained, i.e., the relative change value of the hydraulic diameter of the microchannel before and after welding is approximately equal to the relative change value of the depth of the microchannel:
(3) And the relative change value of the hydraulic diameter before and after the micro-channel welding is approximately equal to the relative change value of the depth before and after the micro-channel welding. In practical application, the relative change values of the hydraulic diameters of the micro-channel before and after welding can be obtained by only measuring the thickness deformation values of the heat exchange core block before and after welding according to the formulas (1) and (3), and the relative change values of the hydraulic diameters of the micro-channel before and after welding can be obtained without cutting the heat exchange core block by destructive means such as slicing, so that the thermal hydraulic analysis of the heat exchanger can be realized.
Referring to fig. 6, in another alternative example, S502 is followed by:
s601, determining the relative change value of the flowing Reynolds number of the fluid medium in the micro-channel according to the relative change value of the hydraulic diameter.
And S602, determining the heat exchange quantity of the welded heat exchange core blocks according to the relative change value of the flowing Reynolds number.
S603, judging whether the heat exchange amount is within the first preset range value or not according to the heat exchange amount and the first preset range value.
In these alternative embodiments, the printed circuit board heat exchanger can obtain various design indexes of the heat exchanger, i.e., various preset heat exchanger indexes, such as design values of heat exchange coefficient, design values of flow resistance, design values of heat exchange amount, and other various main performance indexes related to heat exchange performance, by calculation before production. After obtaining the relative change value of the hydraulic diameter before and after welding of the micro-channel, the relative change value of the flow Reynolds number before and after welding of a fluid medium in the micro-channel can be deduced according to the relative change value of the hydraulic diameter and a calculation formula of the flow Reynolds number, wherein the flow Reynolds number is a dimensionless number which can be used for representing the flow condition of the fluid and can be used for determining the resistance of an object flowing in the fluid, and a specific calculation formula of the flow Reynolds number is a calculation formula of the flow Reynolds number in the prior art.
In one embodiment, as will be readily understood by those skilled in the art, the heat exchange performance of the heat exchanger is directly related to the heat exchange performance of the heat exchange core block, so that the heat exchange amount before and after welding of the heat exchange core block is equal to the heat exchange amount before and after welding of the heat exchanger. The heat exchanger is designed to be provided with a certain heat exchange allowance, so that the heat exchanger is prevented from deforming in the production process or is reduced, and the heat exchange amount deviates from the design index, thereby influencing the normal heat exchange capacity of the heat exchanger. For example, the design value of the heat exchange amount of the heat exchanger is x, the heat exchange allowance is y percent, and then the heat exchange range of the heat exchanger is
I.e. a first preset range value. Therefore, the relative change value of the heat exchange amount before and after welding of the heat exchange core block is required to be obtained through calculation of the relative change value of the Reynolds number before and after welding, then the heat exchange amount after welding of the heat exchange core block is obtained through calculation of the relative change value before and after welding of the heat exchange core block and the design value of the heat exchange amount of the heat exchange core block, and finally whether the heat exchange amount after welding of the heat exchange core block is within the first preset range value is judged, if the finally obtained heat exchange amount after welding of the heat exchange core block is not within the first preset range value, the heat exchange allowance can be adjusted through adjustment of various design indexes of the heat exchanger, so that the welded heat exchanger can still meet normal heat exchange capacity.
Referring to fig. 7, in another alternative example, S601 includes, after:
s701, determining a relative change value of a heat exchange coefficient of the heat exchange core block according to the relative change value of the flowing Reynolds number;
s702, determining a heat exchange coefficient change value before and after welding of the heat exchange core block according to the relative change value of the heat exchange coefficient and a preset heat exchange coefficient;
and S703, determining the heat exchange coefficient of the welded heat exchange core block according to the heat exchange coefficient variation value.
S704, comparing the heat exchange coefficient after the welding of the heat exchange core block with a preset heat exchange coefficient, and judging whether the heat exchange coefficient after the welding of the heat exchange core block meets the preset heat exchange coefficient.
In these optional embodiments, after determining the relative change value of the reynolds number, the relative change value of the heat exchange coefficient before and after welding of the heat exchange core block may be obtained by calculation and derivation according to the formula of the heat exchange coefficient and the reynolds number, where the specific calculation formula is a formula of the reynolds number in the prior art, and details of the present application are not described herein. Then, the heat exchange coefficient after the welding of the heat exchange core block can be calculated according to the design value (preset heat exchange coefficient) of the heat exchange core block heat exchange coefficient, namely the heat exchange coefficient before the welding of the heat exchange core block and the calculated relative change value of the heat exchange coefficient, and if the design value of the heat exchange core block heat exchange coefficient is K, the relative change value of the heat exchange coefficient before and after the welding of the heat exchange core block is K
The heat exchange coefficient after the welding of the heat exchange core block is
Then, then
Finally, K is compared with
Judging whether the heat exchange coefficient after welding of the heat exchange core block meets the design requirements or not, namely whether the normal heat exchange capacity of the heat exchanger is met or not, and if the heat exchange coefficient of the heat exchange core block is reduced, adjusting other parameters of the heat exchange core block to enable the heat exchange coefficient of the heat exchange core block to be larger than that of the heat exchange core blockDesigned heat transfer coefficient. In the optional embodiments, various parameters of the heat exchange core block can be obtained only by measuring the thickness deformation values before and after welding of the heat exchange core block, so that the efficiency of measurement and thermal hydraulic analysis on the heat exchanger is improved to a great extent.
Referring to fig. 8, in another optional example, after S601, the method further includes:
s801, determining a relative change value of the flow resistance of the heat exchange core block according to the relative change value of the flow Reynolds number.
S802, determining the flow resistance change value before and after the welding of the heat exchange core block according to the relative change value of the flow resistance.
And S803, determining the flow resistance of the welded heat exchange core block according to the flow resistance change value.
And S804, comparing the flow resistance of the welded heat exchange core block with the preset flow resistance, and judging whether the flow resistance of the welded heat exchange core block meets the preset flow resistance.
In these optional embodiments, after determining the relative change value of the reynolds number, the relative change value of the flow resistance before and after welding of the heat exchange pellet may be obtained by calculation and derivation according to the formula of the flow resistance and the reynolds number, where the specific calculation formula is a formula of the reynolds number in the prior art, and details of the present application are not described herein. Then, the flow resistance after the welding of the heat exchange core block can be calculated according to a design value (preset flow resistance) of the flow resistance of the heat exchange core block, namely the flow resistance before the welding of the heat exchange core block and a relative change value of the flow resistance obtained by calculation, and if the design value of the flow resistance of the heat exchange core block is F, the relative change value of the flow resistance before and after the welding of the heat exchange core block is F
The flow resistance of the heat exchange core block after welding is
Then, then
Finally, F and F are compared
The size of judging heat transfer pellet after welding whether satisfy the design requirement promptly satisfy the normal heat transfer ability of heat exchanger, if the flow resistance grow of heat transfer pellet, whether so need judge the normal heat transfer demand of heat transfer pellet that whether can also satisfy of the flow resistance that enlarges. In the optional embodiments, various parameters related to the heat exchange performance of the heat exchange core block can be obtained by measuring the thickness deformation values of the heat exchange core block before and after welding, so that the efficiency of measurement and thermal hydraulic analysis of the heat exchanger is improved to a great extent.
Referring to fig. 9, in another alternative example, S502 is followed by:
and S901, calculating a relative change value of the heat exchange quantity of the heat exchange core block according to the relative change value of the hydraulic diameter.
And S902, calculating the change value of the heat exchange amount before and after the welding of the heat exchange core block according to the relative change value of the heat exchange amount and a preset heat exchange amount.
And S903, when the change value of the heat exchange amount is larger than the preset heat exchange allowance value, increasing the preset heat exchange allowance value by increasing the number of the runner plates until the preset heat exchange allowance value is larger than the change value of the heat exchange amount.
In these optional embodiments, it can be known from the above description that a certain heat exchange margin is set in the design of the heat exchanger, so as to ensure that the heat exchange amount of the heat exchanger deviates from the design index due to the deformation of the heat exchanger in the production process or the deviation of the precision of the design formula and the design program of the heat exchanger, thereby affecting the normal heat exchange capability of the heat exchanger. Therefore, the change value of the heat exchange amount before and after the welding of the heat exchange core block is compared with the heat exchange residual value designed by the heat exchange core block, whether the heat exchange capacity of the heat exchanger meets the requirement or not can be evaluated, and the safety of the heat exchanger is improved to a certain extent.
In the embodiment of the application, the relative change value of the heat exchange quantity of the heat exchange core block is firstly obtained, then the change value of the heat exchange quantity of the heat exchange core block before and after welding is obtained through calculation of the relative change value of the heat exchange quantity and the design value of the heat exchange quantity of the heat exchange core block, then the change value of the heat exchange quantity and the size of the preset heat exchange residual quantity value are compared, if the change value of the heat exchange quantity before and after welding is larger than the preset heat exchange residual quantity value, it is indicated that the welded heat exchange core block cannot meet normal heat exchange capacity, and at the moment, the number of the flow channel plates needs to be correspondingly increased to increase the heat exchange residual quantity to ensure that the heat exchange core block can meet the designed heat exchange requirement. For example, if the design value of the heat exchange amount of the heat exchange core block is 100 kilowatts and the heat exchange margin is 20%, the design value of the heat exchange margin of the heat exchange core block is 20 kilowatts, and the measurement method finds that the heat exchange amount of the heat exchange core block is reduced by 25 kilowatts due to the deformation of the micro channels, namely the change value of the heat exchange amount before and after the welding of the heat exchange core block is minus 25 kilowatts, the heat exchange amount of the welded heat exchange core block is changed into 95 kilowatts, which indicates that the heat exchange margin of the welded heat exchange core block cannot meet the normal heat exchange requirement, and the heat exchange margin of the heat exchange core block needs to be increased by increasing the number of the runner plates.
Referring to fig. 10, in another alternative example, S901 includes:
s1001, determining a relative change value of a flowing Reynolds number of the fluid medium in the micro-channel according to the relative change value of the hydraulic diameter.
S1002, determining a relative change value of the heat exchange coefficient of the heat exchange core block and a relative change value of the flow resistance of the heat exchange core block according to the relative change value of the flow Reynolds number of the fluid medium in the micro-channel.
S1003, determining the relative change value of the heat exchange quantity of the heat exchange core block according to the relative change value of the heat exchange coefficient of the heat exchange core block and the relative change value of the flow resistance of the heat exchange core block.
In the optional embodiments, various technical parameters related to the heat exchange performance of the heat exchange core block can be obtained through a formula of a flowing Reynolds number as long as the relative change value of the hydraulic diameter can be determined, and the relative change value of the hydraulic diameter can be obtained through measuring the deformation values of the heat exchange core block in the thickness direction before and after welding by the measuring method provided by the application without cutting the heat exchange core block in a destructive manner, so that the efficiency of thermal hydraulic analysis of the heat exchange core block is improved.
It should be noted that, in the method for measuring the deformation value of the micro channel of the heat exchange pellet provided by the embodiment of the present application, the execution main body may be a device for measuring the deformation value of the micro channel of the heat exchange pellet. The heat exchange pellet micro-channel deformation value measuring device provided by the embodiment of the application is described by taking the heat exchange pellet micro-channel deformation value measuring device as an example to execute a method for measuring the heat exchange pellet micro-channel deformation value.
Fig. 11 is a schematic structural diagram of a device for measuring a deformation value of a micro channel of a heat exchange pellet according to another embodiment of the present disclosure, the device for measuring a deformation value of a micro channel of a heat exchange pellet includes a plurality of stacked channel plates, each channel plate has a plurality of micro channels thereon, and the device may include:
the obtaining module 1101 is used for obtaining a first thickness deformation value before and after welding of the heat exchange core block;
a first determining module 1102, configured to divide the first thickness deformation value by the number of the runner plates, and determine a second thickness deformation value before and after welding of each runner plate;
and a second determining module 1103, configured to determine depth deformation values before and after welding of the micro flow channel according to the second thickness deformation value.
Optionally, the heat exchange pellet micro-channel deformation value measuring device may further include:
the third determining module is used for dividing the depth deformation value by the depth value of the micro-channel before the welding of the heat exchange core block to determine the relative depth change value of the micro-channel;
and the fourth determination module is used for determining the relative change value of the hydraulic diameter of the micro-channel according to the relative change value of the depth.
Optionally, the device for measuring the deformation value of the heat exchange pellet micro-channel may further include:
the fifth determining module is used for determining a relative change value of a flowing Reynolds number of the fluid medium in the micro-channel according to the relative change value of the hydraulic diameter;
the sixth determining module is used for determining the heat exchange quantity of the welded heat exchange core blocks according to the relative change value of the flowing Reynolds number;
and the first judging module is used for judging whether the heat exchange quantity is within a first preset range value or not according to the heat exchange quantity and the first preset range value.
Optionally, the device for measuring the deformation value of the heat exchange pellet micro-channel may further include:
the seventh determining module is used for determining the relative change value of the heat exchange coefficient of the heat exchange core block according to the relative change value of the flowing Reynolds number;
the eighth determining module is used for determining the heat exchange coefficient change value before and after the welding of the heat exchange core block according to the relative change value of the heat exchange coefficient and the preset heat exchange coefficient;
the ninth determining module is used for determining the heat exchange coefficient of the welded heat exchange core block according to the heat exchange coefficient change value;
and the second judging module is used for comparing the heat exchange coefficient after the welding of the heat exchange core block with the preset heat exchange coefficient and judging whether the heat exchange coefficient after the welding of the heat exchange core block meets the preset heat exchange coefficient.
Optionally, the device for measuring the deformation value of the heat exchange pellet micro-channel may further include:
the tenth determining module is used for determining a relative change value of the flow resistance of the heat exchange core block according to the relative change value of the flow Reynolds number;
the eleventh determining module is used for determining the flow resistance change value before and after the welding of the heat exchange core block according to the relative change value of the flow resistance;
the twelfth determining module is used for determining the flow resistance of the welded heat exchange core block according to the flow resistance change value;
and the third judging module is used for comparing the flow resistance after the welding of the heat exchange core block with the preset flow resistance and judging whether the flow resistance after the welding of the heat exchange core block meets the preset flow resistance.
Optionally, the device for measuring the deformation value of the heat exchange pellet micro-channel may further include:
the first calculation module is used for calculating the relative change value of the heat exchange quantity of the heat exchange core block according to the relative change value of the hydraulic diameter;
and the second calculation module is used for calculating the change value of the heat exchange quantity before and after the welding of the heat exchange core block according to the relative change value of the heat exchange quantity and the preset heat exchange quantity.
And the control module is used for increasing the preset heat exchange allowance value by increasing the number of the runner plates when the change value of the heat exchange amount is larger than the preset heat exchange allowance value until the preset heat exchange allowance value is larger than the change value of the heat exchange amount.
Optionally, the heat exchange pellet micro-channel deformation value measuring device may further include:
the thirteenth determining module is used for determining the relative change value of the flowing Reynolds number of the fluid medium in the micro-channel according to the relative change value of the hydraulic diameter;
the fourteenth determining module is used for determining the relative change value of the heat exchange coefficient of the heat exchange core block and the relative change value of the flow resistance of the heat exchange core block according to the relative change value of the flow Reynolds number of the fluid medium in the micro-channel;
and the fifteenth determining module is used for determining the relative change value of the heat exchange quantity of the heat exchange core block according to the relative change value of the heat exchange coefficient of the heat exchange core block and the relative change value of the flow resistance of the heat exchange core block.
It should be noted that the device for measuring the deformation value of the micro-channel of the heat exchange pellet is a device corresponding to the method for measuring the deformation value of the micro-channel of the heat exchange pellet, and all the implementation manners in the embodiment of the method are applicable to the embodiment of the device, and the same technical effect can be achieved.
Fig. 12 shows a hardware structure diagram of a measurement device provided in an embodiment of the present application.
The measurement device may include a processor 1201 and a memory 1202 having computer program instructions stored therein.
In particular, the processor 1201 may include a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or may be configured to implement one or more Integrated circuits of the embodiments of the present Application.
In particular embodiments, memory 1202 may include Read Only Memory (ROM), random Access Memory (RAM), magnetic disk storage media devices, optical storage media devices, flash memory devices, electrical, optical, or other physical/tangible memory storage devices. Thus, in general, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software comprising computer-executable instructions and when the software is executed (e.g., by one or more processors), it is operable to perform operations described with reference to the methods according to an aspect of the present disclosure.
The processor 1201 realizes any one of the measurement apparatus control methods in the above embodiments by reading and executing computer program instructions stored in the memory 1202.
In one example, the measurement device can also include a communication interface 1203 and a bus 1210. As shown in fig. 12, the processor 1201, the memory 1202, and the communication interface 1203 are connected via a bus 1210 to complete communication therebetween.
The communication interface 1203 is mainly used for implementing communication between devices, units and/or apparatuses in this embodiment of the present application.
In addition, in combination with the measuring apparatus control method in the foregoing embodiments, the embodiments of the present application may be implemented by providing a computer-readable storage medium. The computer readable storage medium having stored thereon computer program instructions; the computer program instructions, when executed by a processor, implement any of the measurement device control methods in the above embodiments.
It is to be understood that the present application is not limited to the particular arrangements and instrumentality described above and shown in the attached drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present application are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications, and additions or change the order between the steps after comprehending the spirit of the present application.
The functional blocks shown in the above structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of the present application are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include an electronic circuit, a semiconductor memory device, a ROM, a flash memory, an Erasable ROM (EROM), a floppy disk, a CD-ROM, an optical disk, a hard disk, an optical fiber medium, a Radio Frequency (RF) link, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, the present application is not limited to the order of the above steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed at the same time.
Aspects of the present disclosure are described above with reference to flowchart illustrations and/or block diagrams of methods and apparatus (systems) according to embodiments of the disclosure. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, implement the functions/acts specified in the flowchart and/or block diagram block or blocks. Such a processor may be, but is not limited to, a general purpose processor, a special purpose processor, an application specific processor, or a field programmable logic circuit. It will also be understood that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based computer instructions which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
As will be apparent to those skilled in the art, for convenience and brevity of description, the specific working processes of the systems, modules and units described above may refer to corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present application, and these modifications or substitutions should be covered within the scope of the present application.
Claims (8)
1. A method for measuring the deformation value of a micro-channel of a heat exchange core block, wherein the heat exchange core block comprises a plurality of laminated channel plates, and a plurality of micro-channels are arranged on the channel plates, and the method comprises the following steps:
acquiring a first thickness deformation value before and after the welding of the heat exchange core block, wherein the first thickness deformation value is a total body deformation value before and after the welding of the heat exchange core block;
dividing the first thickness deformation value by the number of the runner plates to determine a second thickness deformation value before and after welding of each runner plate;
determining depth deformation values before and after the welding of the micro-channel according to the second thickness deformation value;
wherein, according to the second thickness deformation value, determining the depth deformation value before and after the welding of the micro-channel comprises:
dividing the depth deformation value by the depth value of the micro-channel before the welding of the heat exchange pellet to determine the relative depth change value of the micro-channel;
determining the relative change value of the hydraulic diameter of the micro-channel according to the relative change value of the depth;
wherein after determining the relative change value of the hydraulic diameter of the micro flow channel, the measuring method further comprises:
determining a relative change value of a flowing Reynolds number of the fluid medium in the micro-channel according to the relative change value of the hydraulic diameter;
determining the heat exchange quantity of the welded heat exchange core blocks according to the relative change value of the flowing Reynolds number;
and judging whether the heat exchange amount is within a first preset range value or not according to the heat exchange amount and the first preset range value.
2. The measurement method according to claim 1, wherein after determining the relative change value of the reynolds number of the fluid medium flowing in the micro flow channel, the measurement method further comprises:
determining a relative change value of the heat exchange coefficient of the heat exchange core block according to the relative change value of the flowing Reynolds number;
determining the heat exchange coefficient change value before and after welding the heat exchange core block according to the heat exchange coefficient relative change value and a preset heat exchange coefficient;
determining the heat exchange coefficient of the welded heat exchange core block according to the heat exchange coefficient variation value;
and comparing the heat exchange coefficient after the welding of the heat exchange core blocks with the preset heat exchange coefficient, and judging whether the heat exchange coefficient after the welding of the heat exchange core blocks meets the preset heat exchange coefficient.
3. The measurement method according to claim 1, wherein after the determination of the relative change value of the reynolds number of the fluid medium flowing in the micro flow channel, the measurement method further comprises:
determining a relative change value of the flow resistance of the heat exchange core block according to the relative change value of the flow Reynolds number;
determining the flow resistance change value before and after the welding of the heat exchange core block according to the relative change value of the flow resistance;
determining the flow resistance of the welded heat exchange core block according to the flow resistance change value;
and comparing the flow resistance of the welded heat exchange core block with a preset flow resistance, and judging whether the flow resistance of the welded heat exchange core block meets the preset flow resistance.
4. The measurement method according to claim 1, wherein after the determination of the relative change value in the hydraulic diameter of the micro flow channel, the measurement method further comprises:
calculating a relative change value of the heat exchange quantity of the heat exchange core block according to the relative change value of the hydraulic diameter;
calculating to obtain a change value of the heat exchange amount before and after the welding of the heat exchange core block according to the relative change value of the heat exchange amount and a preset heat exchange amount;
and when the change value of the heat exchange amount is larger than a preset heat exchange allowance value, increasing the preset heat exchange allowance value by increasing the number of the runner plates until the preset heat exchange allowance value is larger than the change value of the heat exchange amount.
5. The measuring method according to claim 4, wherein the calculating of the relative change value of the heat exchange amount of the heat exchange core block according to the relative change value of the hydraulic diameter comprises:
determining a relative change value of the flowing Reynolds number of the fluid medium in the micro-channel according to the relative change value of the hydraulic diameter;
determining a relative change value of a heat exchange coefficient of the heat exchange core block and a relative change value of flow resistance of the heat exchange core block according to a relative change value of a flow Reynolds number of a fluid medium in the micro-channel;
and determining the relative change value of the heat exchange quantity of the heat exchange core block according to the relative change value of the heat exchange coefficient of the heat exchange core block and the relative change value of the flow resistance of the heat exchange core block.
6. The utility model provides a heat transfer pellet microchannel deformation value measuring device, the heat transfer pellet includes a plurality of range upon range of runner plates, a plurality of microchannels have on the runner plate, its characterized in that, measuring device includes:
the acquisition module is used for acquiring a first thickness deformation value before and after the heat exchange core block is welded;
the first determining module is used for dividing the first thickness deformation value by the number of the runner plates and determining a second thickness deformation value before and after welding of each runner plate, wherein the first thickness deformation value is a total body deformation value before and after welding of the heat exchange core blocks;
the second determining module is used for determining depth deformation values before and after the welding of the micro-channel according to the second thickness deformation value;
the third determining module is used for dividing the depth deformation value by the depth value of the micro-channel before the welding of the heat exchange pellet to determine the relative depth change value of the micro-channel;
the fourth determination module is used for determining the relative change value of the hydraulic diameter of the micro-channel according to the relative change value of the depth;
the fifth determining module is used for determining a relative change value of the flowing Reynolds number of the fluid medium in the micro-channel according to the relative change value of the hydraulic diameter;
the sixth determining module is used for determining the heat exchange quantity of the welded heat exchange core blocks according to the relative change value of the flowing Reynolds number;
and the first judging module is used for judging whether the heat exchange quantity is within a first preset range value or not according to the heat exchange quantity and the first preset range value.
7. A measuring apparatus, characterized in that the measuring apparatus comprises: a processor and a memory storing computer program instructions;
the processor, when executing the computer program instructions, implements the measurement method of any of claims 1-5.
8. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon computer program instructions which, when executed by a processor, implement the measurement method according to any one of claims 1-5.
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| CN116558328B (en) * | 2023-07-10 | 2023-09-01 | 中国核动力研究设计院 | Microchannel heat exchanger and manufacturing method thereof |
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