CN116890147B - Manufacturing method of plate heat exchanger and system for producing plate heat exchanger - Google Patents
Manufacturing method of plate heat exchanger and system for producing plate heat exchanger Download PDFInfo
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- CN116890147B CN116890147B CN202311162062.8A CN202311162062A CN116890147B CN 116890147 B CN116890147 B CN 116890147B CN 202311162062 A CN202311162062 A CN 202311162062A CN 116890147 B CN116890147 B CN 116890147B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 49
- 238000005219 brazing Methods 0.000 claims abstract description 237
- 238000000034 method Methods 0.000 claims abstract description 59
- 238000010438 heat treatment Methods 0.000 claims description 120
- 238000004321 preservation Methods 0.000 claims description 77
- 238000001816 cooling Methods 0.000 claims description 22
- 230000008569 process Effects 0.000 abstract description 36
- 238000003466 welding Methods 0.000 abstract description 29
- 238000012797 qualification Methods 0.000 abstract description 7
- 229910000679 solder Inorganic materials 0.000 description 12
- 239000000463 material Substances 0.000 description 10
- 230000001276 controlling effect Effects 0.000 description 8
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
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- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
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Classifications
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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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
- B23K1/0012—Brazing heat exchangers
-
- 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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/008—Soldering within a furnace
-
- 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
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
-
- 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
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
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Abstract
The invention provides a manufacturing method and a production system of a plate heat exchanger, which belong to the technical field of plate heat exchanger production, wherein the manufacturing method utilizes a vacuum brazing furnace to braze the plate heat exchanger, and the method comprises the following steps: selecting different operation modes of the vacuum brazing furnace according to the number of the plate heat exchangers in the vacuum furnace and the number A of the plates of the plate heat exchangers; wherein, different operation modes are used for controlling different temperatures, vacuum degrees and brazing time in the brazing furnace. According to the manufacturing method of the plate heat exchanger, different operation modes of the vacuum brazing furnace can be flexibly controlled according to actual conditions of the plate heat exchanger and the brazing furnace, so that accurate control of temperature, vacuum degree and brazing time in a brazing process is realized, and therefore the false welding and missing welding conditions of products after brazing can be effectively reduced, and the production qualification rate of the plate heat exchanger is provided.
Description
Technical Field
The invention relates to the technical field of plate heat exchanger production, in particular to a manufacturing method of a plate heat exchanger and a system for producing the plate heat exchanger.
Background
The plate heat exchanger is ideal equipment for carrying out heat exchange between liquid and between liquid and vapor, has the advantages of high heat exchange efficiency, light weight, small occupied space, compact structure, easy maintenance and the like, and is widely applied to various industries. Plate heat exchanger brazing is a common plate heat exchanger manufacturing process, and is a method of combining two or more metal materials with each other by melting the solder by heating. Brazing is widely applied to plate-to-plate connection of plate heat exchangers, and tight connection between plates can be realized through a plate heat exchanger brazing process, so that heat exchange efficiency and reliability of the heat exchanger are ensured.
In the brazing process, a vacuum brazing furnace is required to heat the plates, so that the brazing flux is melted and filled into gaps of contact surfaces of the plates. In the heating process, the vacuum degree and the temperature in the vacuum brazing furnace need to be strictly controlled according to the specific conditions of the plate heat exchanger, and if the temperature and the pressure are improperly regulated in the brazing process, the produced plate heat exchanger is easy to cause the conditions of cold joint, cold joint leakage and the like, so that the quality of the produced product is unqualified.
In the prior art, no related study is made on controlling the pressure and the temperature of the brazing process according to the condition of the plate heat exchanger. Therefore, the brazing process of the existing plate heat exchanger needs to be improved, so that the production qualification rate of the plate heat exchanger is improved, and the production efficiency is improved.
Disclosure of Invention
In order to overcome the problems in the related art, the invention aims to provide a manufacturing method of a plate heat exchanger, which can flexibly control different operation modes of a vacuum brazing furnace according to the actual conditions of the plate heat exchanger and the brazing furnace so as to realize the accurate control of the temperature, the vacuum degree and the brazing time in the brazing process, thereby effectively reducing the cold welding and the cold welding leakage of the brazed product and providing the production qualification rate of the plate heat exchanger.
A manufacturing method of a plate heat exchanger, which utilizes a vacuum brazing furnace to braze the plate heat exchanger, comprises the following steps:
selecting different operation modes of the vacuum brazing furnace according to the number of the plate heat exchangers in the vacuum furnace and the number A of the plates of the plate heat exchangers;
different operation modes are used for controlling different temperatures, vacuum degrees and brazing time in the brazing furnace, and the operation modes are control programs of a controller preset in the vacuum brazing furnace; the operation modes comprise a mode S1, a mode S2, a mode S3 and a mode S4, and each different operation mode comprises: the vacuum pumping stage, the primary heating stage, the depressurization and heat preservation stage, the secondary heating and heat preservation stage and the depressurization and cooling stage.
In a preferred technical scheme of the invention, according to the number of the plate heat exchangers in the vacuum furnace and the number A of the plates of the plate heat exchangers, selecting different operation modes of the vacuum brazing furnace comprises:
obtaining the volume V of the plate heat exchanger to be produced 1 ；
Obtaining the volume V of a vacuum brazing furnace to be subjected to 2 ；
According to V 1 、V 2 To judge the maximum number threshold N of the plate heat exchangers accommodated in the vacuum brazing furnace max The method comprises the steps of carrying out a first treatment on the surface of the Will N max The number of the heat exchangers in the vacuum furnace is considered;
according to N max And the number A of the plates of the plate heat exchanger, and selecting different operation modes of the vacuum brazing furnace.
In a preferred embodiment of the present invention, the method is according to N max And the number A of the plates of the plate heat exchanger, selecting different operation modes of the vacuum brazing furnace, comprising:
defining a ratio of the length L to the width W of the plate heat exchanger plates;
acquiring the length L of a plate of the plate heat exchanger, and determining L and V 2 Is a relationship of (2);
according to the length L of the plates of the plate heat exchanger and the number A of the plates of the plate heat exchanger, different operation modes of the vacuum brazing furnace are selected.
In a preferred technical scheme of the invention, according to the length L of the plates of the plate heat exchanger and the number A of the plates of the plate heat exchanger, different operation modes of the vacuum brazing furnace are selected, and the method comprises the following steps:
judging whether L is larger than X, if yes, judging whether the number A of the plates of the plate heat exchanger is larger than Y;
if the number A of the plates is larger than Y, selecting a mode S1; if the number A of the plates is smaller than Y, selecting an operation mode S2; in the mode S1 and the mode S2, the heat preservation time length of the depressurization heat preservation stage is different, and the heat preservation time length of the secondary heating heat preservation stage is different;
judging whether L is larger than X, if not, judging whether the number A of the plates of the plate heat exchanger is larger than Y+10;
if the number A of the plates is greater than Y+10, selecting a mode S3; if the number of plates A is less than Y+10, selecting a mode S4; in the mode S3 and the mode S4, the heat preservation time length of the depressurization heat preservation stage is different, and the heat preservation time length of the secondary heating heat preservation stage is different;
wherein X is the preset value of the length of the plate sheets of the plate heat exchanger in the controller of the vacuum brazing furnace, the unit is mm, and Y is the preset value of the number of the plate sheets of the plate heat exchanger in the controller of the vacuum brazing furnace, and the unit is sheets.
In a preferred embodiment of the present invention, the mode S1 includes:
and (3) vacuumizing: starting a vacuum pump of the brazing furnace to vacuumize, and not starting a heating system;
primary heating stage: when the vacuum degree in the brazing furnace reaches 10 a Starting a heating system, and heating the temperature in the brazing furnace to a temperature T within a set time period T; when the vacuum degree in the brazing furnace is less than 10 a When the vacuum is continuously pumped until the vacuum degree in the brazing furnace reaches 10 a Until that is reached; depressurization and heat preservation: maintaining the temperature T unchanged, and using the time length of (2/3) T1 to ensure that the vacuum degree in the furnace is changed from 10 a Down to 10 j And keeping the temperature T unchanged for a period of time until T1;
and (3) a secondary heating and heat preservation stage: heating the temperature in the brazing furnace to a temperature T1 within a set time period T2, and maintaining the temperature T1 for a constant heat preservation time period T3;
depressurization cooling stage: the heating system is turned off, the temperature in the brazing furnace is cooled to the temperature T5, and then the pressure in the brazing furnace is changed from 10 j Raising the temperature to 1/10 of the atmospheric pressure, reducing the temperature in the furnace to below 40 ℃ under 1/10 of the atmospheric pressure, and taking out the plate heat exchanger;
wherein, the units of t, t1, t2 and t3 are all minutes; units of T, T and T5 are all degrees centigrade; a. j is a natural number.
In a preferred embodiment of the present invention, the mode S2 includes:
and (3) vacuumizing: starting a vacuum pump of the brazing furnace to vacuumize, and not starting a heating system;
primary heating stage: when the vacuum degree in the brazing furnace reaches 10 a Starting a heating system, and heating the temperature in the brazing furnace to a temperature T within a set time period T; when the vacuum degree in the brazing furnace is less than 10 a When the vacuum is continuously pumped until the vacuum degree in the brazing furnace reaches 10 a Until that is reached;
depressurization and heat preservation: maintaining the temperature T unchanged, and using the time length of (2/3) T1 to ensure that the vacuum degree in the furnace is changed from 10 a Down to 10 k And maintaining the temperature T unchanged for a period of time from T1 to c 1;
and (3) a secondary heating and heat preservation stage: heating the temperature in the brazing furnace to a temperature T2 within a set time period T2, and maintaining the temperature T2 for a constant heat preservation time period T3-d1;
depressurization cooling stage: the heating system is turned off, the temperature in the brazing furnace is cooled to the temperature T5, and then the pressure in the brazing furnace is changed from 10 k Raising the temperature to 1/10 of the atmospheric pressure, reducing the temperature in the furnace to below 40 ℃ under 1/10 of the atmospheric pressure, and taking out the plate heat exchanger;
wherein, the units of t, t1, t2 and t3 are all minutes; units of T, T and T5 are all degrees centigrade; a. k, c1, d1 are natural numbers.
In a preferred embodiment of the present invention, the mode S3 includes:
and (3) vacuumizing: starting a vacuum pump of the brazing furnace to vacuumize, and not starting a heating system;
primary heating stage: when the vacuum degree in the brazing furnace reaches 10 a Starting a heating system, and heating the temperature in the brazing furnace to a temperature T within a set time period T; when the vacuum degree in the brazing furnace is less than 10 a When the vacuum is continuously pumped until the vacuum degree in the brazing furnace reaches 10 a Until that is reached;
depressurization and heat preservation: maintaining the temperature T unchanged, and using the time length of (2/3) T1 to ensure that the vacuum degree in the furnace is changed from 10 a Down to 10 m And maintaining the temperature T unchanged for a period of time from T1 to c 2;
and (3) a secondary heating and heat preservation stage: heating the temperature in the brazing furnace to a temperature T3 within a set time period T2, and maintaining the temperature T3 unchanged for a time period of T3-d 2;
depressurization cooling stage: the heating system is turned off, the temperature in the brazing furnace is cooled to the temperature T5, and then the pressure in the brazing furnace is changed from 10 m Raising the temperature to 1/10 of the atmospheric pressure, reducing the temperature in the furnace to below 40 ℃ under 1/10 of the atmospheric pressure, and taking out the plate heat exchanger;
wherein, the units of t, t1, t2 and t3 are all minutes; units of T, T and T5 are all degrees centigrade; a. m, c2, d2 are natural numbers.
In a preferred embodiment of the present invention, the mode S4 includes:
and (3) vacuumizing: starting a vacuum pump of the brazing furnace to vacuumize, and not starting a heating system;
primary heating stage: when the vacuum degree in the brazing furnace reaches 10 a Starting a heating system, and heating the temperature in the brazing furnace to a temperature T within a set time period T; when the vacuum degree in the brazing furnace is less than 10 a When the vacuum is continuously pumped until the vacuum degree in the brazing furnace reaches 10 a Until that is reached;
depressurization and heat preservation: maintaining the temperature T unchanged, and using the time length of (2/3) T1 to ensure that the vacuum degree in the furnace is changed from 10 a Down to 10 n And maintaining the temperature T unchanged for a period of time from T1 to c 3;
and (3) a secondary heating and heat preservation stage: heating the temperature in the brazing furnace to a temperature T4 within a set time period T2, and maintaining the temperature T4 for a constant heat preservation time period T3-d3;
depressurization cooling stage: the heating system is turned off, the temperature in the brazing furnace is cooled to the temperature T5, and then the pressure in the brazing furnace is changed from 10 n Raising the temperature to 1/10 of the atmospheric pressure, reducing the temperature in the furnace to below 40 ℃ under 1/10 of the atmospheric pressure, and taking out the plate heat exchanger;
wherein, the units of t, t1, t2 and t3 are all minutes; units of T, T and T5 are all degrees centigrade; a. n, c3, d3 are natural numbers.
The utility model discloses a to the operational mode that different plate heat exchangers can select different vacuum brazing furnace, braze plate heat exchanger through different operational modes, the pertinence is strong, through the vacuum in the strict control vacuum brazing furnace, temperature, avoids the plate heat exchanger of producing to appear the condition such as rosin joint, welding omission, guarantees that the product quality of producing is excellent.
It is a further object of the present invention to provide a system for producing a plate heat exchanger for carrying out the method of manufacturing a plate heat exchanger as described above. The production system can carry out targeted production process adjustment according to the detailed conditions of different plate heat exchangers, and ensures the brazing quality of the plate heat exchangers.
The beneficial effects of the invention are as follows:
the invention provides a manufacturing method of a plate heat exchanger, which utilizes a vacuum brazing furnace to braze the plate heat exchanger, and comprises the following steps: selecting different operation modes of the vacuum brazing furnace according to the number of the plate heat exchangers in the vacuum furnace and the number A of the plates of the plate heat exchangers; wherein, different operation modes are used for controlling different temperatures, vacuum degrees and brazing time in the brazing furnace. In the application process, the method can flexibly control the operation modes of different vacuum brazing furnaces according to the actual conditions of the plate heat exchanger and the brazing furnaces. The temperature, the vacuum degree and the brazing time in the vacuum brazing furnace can be controlled in different operation modes, so that the uniformity of heat transfer of the plate heat exchanger in the brazing process is realized, and the consistency of the brazed products is improved. And the control of different temperatures and vacuum degrees can realize low oxidation and low evaporation of welding materials and welding materials in the welding process, so that the plates of the plate heat exchanger are tightly connected, and the heat exchange efficiency and the reliability of the heat exchanger are ensured. The method can realize the accurate control of the temperature, the vacuum degree and the brazing time in the brazing process, so that the false welding and the missing welding of the product after brazing can be effectively reduced, and the production qualification rate of the plate heat exchanger is provided.
The present application also provides a production system for implementing a method of manufacturing a plate heat exchanger as described above. In the process of brazing the plate heat exchanger, the system can flexibly control the brazing temperature, vacuum degree and brazing time according to the conditions of products and production equipment, and ensure the brazing quality.
Drawings
Fig. 1 is a flow chart of a method of manufacturing a plate heat exchanger provided by the invention;
FIG. 2 is a flow chart of how the different modes of operation of the brazing furnace are selected according to the present invention;
FIG. 3 is a flow chart of mode S1 provided by the present invention;
FIG. 4 is a flow chart of mode S2 provided by the present invention;
FIG. 5 is a flow chart of mode S3 provided by the present invention;
fig. 6 is a flowchart of mode S4 provided by the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
It should be understood that although the terms "first," "second," "third," etc. may be used herein to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the invention. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The plate heat exchanger is ideal equipment for carrying out heat exchange between liquid and between liquid and vapor, has the advantages of high heat exchange efficiency, light weight, small occupied space, compact structure, easy maintenance and the like, and is widely applied to various industries. Plate heat exchanger brazing is a common plate heat exchanger manufacturing process, and is a method of combining two or more metal materials with each other by melting the solder by heating. Brazing is widely applied to plate-to-plate connection of plate heat exchangers, and tight connection between plates can be realized through a plate heat exchanger brazing process, so that heat exchange efficiency and reliability of the heat exchanger are ensured.
In the brazing process, a vacuum brazing furnace is required to heat the plates, so that the brazing flux is melted and filled into gaps of contact surfaces of the plates. In the heating process, the vacuum degree and the temperature in the vacuum brazing furnace need to be strictly controlled according to the specific conditions of the plate heat exchanger, and if the temperature and the pressure are improperly regulated in the brazing process, the produced plate heat exchanger is easy to cause the conditions of cold joint, cold joint leakage and the like, so that the quality of the produced product is unqualified.
In the prior art, no related study is made on controlling the pressure and the temperature of the brazing process according to the condition of the plate heat exchanger. Therefore, the brazing process of the existing plate heat exchanger needs to be improved, so that the production qualification rate of the plate heat exchanger is improved, and the production efficiency is improved. Accordingly, the present application provides a method of manufacturing a plate heat exchanger to overcome the drawbacks of the prior art.
Example 1
Referring to fig. 1 to 6, the present embodiment provides a method of manufacturing a plate heat exchanger, the method brazing the plate heat exchanger using a vacuum brazing furnace, comprising:
s100, selecting different operation modes of the vacuum brazing furnace according to the number of plate heat exchangers in the vacuum furnace and the number A of plates of the plate heat exchangers;
s200, different operation modes are used for controlling different temperatures, vacuum degrees and brazing time in the brazing furnace.
In practical applications, different operation modes have different operation stages, and each different operation stage has different temperature, vacuum degree and brazing time. According to the method, the brazing process matching under the parameters of the specific plate heat exchanger is realized, the false welding and missing welding conditions of welding finished products can be effectively reduced, and the product qualification rate is improved.
Specifically, according to the number of the plate type heat exchangers in the vacuum furnace and the number A of the plates of the plate type heat exchangers, selecting different operation modes of the vacuum brazing furnace comprises the following steps:
obtaining the volume V of the plate heat exchanger to be produced 1 ；
Obtaining the volume V of a vacuum brazing furnace to be subjected to 2 ；
According to V 1 、V 2 To judge the maximum number threshold N of the plate heat exchangers accommodated in the vacuum brazing furnace max The method comprises the steps of carrying out a first treatment on the surface of the Will N max The number of the heat exchangers in the vacuum furnace is considered;
according to N max And the number A of the plates of the plate heat exchanger, and selecting different operation modes of the vacuum brazing furnace.
Still further, the method according to N max And the number A of the plates of the plate heat exchanger, selecting different operation modes of the vacuum brazing furnace, comprising:
defining a ratio of the length L to the width W of the plate heat exchanger plates; in practical application, research shows that when the length-width ratio of the plate sheets of the plate heat exchanger is 2:1, the flow uniformity inside the plate heat exchanger is better, and the heat exchange performance is better. Thus, the aspect ratio of a plate heat exchanger produced using the manufacturing method of the present application is generally determined, length of the plate heat exchanger: width of plate heat exchanger = 2:1.
Acquiring the length L of a plate of the plate heat exchanger, and determining L and V 2 Is a relationship of (2); on the premise of a certain length-width ratio of the plate heat exchanger, when the maximum accommodating quantity of the plate heat exchanger in the brazing furnace is obtained, the plates can be omittedOnly the length of the plate is selected for calculation, so that the time for judging the heat exchanger in the furnace can be saved, and the efficiency can be improved.
According to the length L of the plates of the plate heat exchanger and the number A of the plates of the plate heat exchanger, different operation modes of the vacuum brazing furnace are selected.
The present application provides a method for selecting an operating mode by only taking the plate length, the number of plates and the furnace volume of the brazing furnace of a plate heat exchanger. It should be noted that, the method presets various operation modes in the vacuum brazing furnace, and the different operation modes can be adjusted according to specific parameters of the plate heat exchanger. In the production process, only before the plate heat exchanger is welded in the furnace, workers know the detailed parameters of the plate heat exchanger and directly select the corresponding operation mode, so that the plate heat exchanger is convenient to produce and high in operability.
In addition, practical researches show that the thickness of the plate heat exchanger plate has small influence on the brazing temperature and pressure of the brazing furnace, so that the thickness of the plate can be ignored in the brazing process, and the operation mode of the brazing furnace can be judged and selected according to the length and the number of the plate.
The number of the plate heat exchangers in the vacuum brazing furnace and the number of the vacuum brazing furnace can influence the brazing quality in the brazing process. The main reason is that the size and the number of the plate heat exchangers can influence the heated and pressed condition of the plate heat exchangers in the brazing process. Therefore, different operation modes need to be flexibly selected according to the specific conditions of the plate heat exchanger in the brazing process.
Further, according to the number of the plate heat exchangers in the vacuum furnace and the number of the plates A of the plate heat exchangers, selecting different operation modes of the vacuum brazing furnace comprises the following steps:
obtaining the volume V of the plate heat exchanger to be produced 1 ；
Obtaining the volume V of a vacuum brazing furnace to be subjected to 2 ；
The manufacturing method of the plate heat exchanger provided by the invention utilizes the vacuum brazing furnace to braze the plate heat exchanger, and can flexibly control different operation modes of the vacuum brazing furnace according to the actual conditions of the plate heat exchanger and the brazing furnace in the application process. The temperature, the vacuum degree and the brazing time in the vacuum brazing furnace can be controlled in different operation modes, so that the uniformity of heat transfer of the plate heat exchanger in the brazing process is realized, and the consistency of the brazed products is improved. And the control of different temperatures and vacuum degrees can realize low oxidation and low evaporation of welding materials and welding materials in the welding process, so that the plates of the plate heat exchanger are tightly connected, and the heat exchange efficiency and the reliability of the heat exchanger are ensured. The method can realize the accurate control of the temperature, the vacuum degree and the brazing time in the brazing process, so that the false welding and the missing welding of the product after brazing can be effectively reduced, and the production qualification rate of the plate heat exchanger is provided.
Example 2
Referring to fig. 1 to 6, the present embodiment includes a method of manufacturing the above-described plate heat exchanger, the method brazing the plate heat exchanger using a vacuum brazing furnace, the method including:
s100, selecting different operation modes of the vacuum brazing furnace according to the number of plate heat exchangers in the vacuum furnace and the number A of plates of the plate heat exchangers;
s200, different operation modes are used for controlling different temperatures, vacuum degrees and brazing time in the brazing furnace.
The embodiment provides different operation modes of the vacuum brazing furnace, wherein the operation modes are control programs of a controller of the vacuum brazing furnace.
The operation modes comprise a mode S1, a mode S2, a mode S3 and a mode S4, and each different operation mode comprises: the vacuum pumping stage, the primary heating stage, the depressurization and heat preservation stage, the secondary heating and heat preservation stage and the depressurization and cooling stage.
In the application process, production personnel can directly select different operation modes in the brazing furnace according to the specific conditions of the plate heat exchanger. For example, the mode S1 is selected according to the case of a plate heat exchanger.
Further, according to the length L of the plates of the plate heat exchanger and the number a of the plates of the plate heat exchanger, selecting different operation modes of the vacuum brazing furnace comprises:
judging whether L is larger than X, if yes, judging whether the number A of the plates of the plate heat exchanger is larger than Y;
if the number A of the plates is larger than Y, selecting a mode S1; if the number A of the plates is smaller than Y, selecting an operation mode S2; in the mode S1 and the mode S2, the heat preservation time length of the depressurization heat preservation stage is different, and the heat preservation time length of the secondary heating heat preservation stage is different; the different heat preservation time periods are used for controlling the melting condition of the solder of the plate heat exchangers with different sizes.
Judging whether L is larger than X, if not, judging whether the number A of the plates of the plate heat exchanger is larger than Y+10;
if the number A of the plates is greater than Y+10, selecting a mode S3; if the number of plates A is less than Y+10, selecting a mode S4; in the mode S3 and the mode S4, the heat preservation duration of the depressurization heat preservation stage is different, and the heat preservation duration of the secondary heating heat preservation stage is different. The different heat preservation time periods are used for controlling the melting condition of the solder of the plate heat exchangers with different sizes. Wherein X is the preset value of the length of the plate sheets of the plate heat exchanger in the controller of the vacuum brazing furnace, the unit is mm, and Y is the preset value of the number of the plate sheets of the plate heat exchanger in the controller of the vacuum brazing furnace, and the unit is sheets.
First, the present application provides specific embodiments of how different operation modes can be selected according to the plate length, number of plate heat exchangers. In this embodiment, X, Y is a specific value, which can be adjusted according to the actual situation. In addition, this value is also related to the material of the plate. For example, when the plate is made of stainless steel and the brazing material is copper, the value of X may be 300mm to 500mm, and the value of Y may be 50 sheets to 80 sheets.
In a more specific embodiment, the mode S1 includes:
and (3) vacuumizing: starting a vacuum pump of the brazing furnace to vacuumize, and not starting a heating system; the reason why the heating system is not started in the vacuumizing stage is to prevent the plate from being easily oxidized in a high-temperature aerobic environment, wherein the range of a critical parameter value a of the vacuum degree is 1.5-3, and the preferred value is 2; when the pressure value in the brazing furnace reaches a set value, the heating system is started, and the vacuum value is kept unchanged through the cooperation of the pressure sensor in the brazing furnace and the vacuum pump.
Primary heating stage: when the vacuum degree in the brazing furnace reaches 10 a Starting a heating system, and heating the temperature in the brazing furnace to a temperature T within a set time period T; when the vacuum degree in the brazing furnace is less than 10 a When the vacuum is continuously pumped until the vacuum degree in the brazing furnace reaches 10 a Until that is reached; in the heating process, the steel heating rate and the cooling rate of the plate are larger in adjusting range, and the heating rate is faster and better under the condition that the structure of the plate is deformed. For example for a plate heat exchanger with 316L stainless steel plate, where the preferred range of T is 40-60 minutes and the preferred range of temperature T is 750-850 ℃.
Depressurization and heat preservation: maintaining the temperature T unchanged, and using the time length of (2/3) T1 to ensure that the vacuum degree in the furnace is changed from 10 a Down to 10 j And keeping the temperature T unchanged for a period of time until T1; the heat preservation stage is to ensure the temperature uniformity in the furnace, so that the solder is melted better, and the longer the length of the plate is, the longer the heat preservation time is. In order to ensure that the solder and the plate components are not excessively evaporated, the pressure reduction treatment is needed, in particular, the vacuum degree in the furnace is changed from 10 a Down to 10 j . The preferred range of j is (a-0.3) to (a-0.5).
And (3) a secondary heating and heat preservation stage: heating the temperature in the brazing furnace to a temperature T1 within a set time period T2, and maintaining the temperature T1 for a constant heat preservation time period T3; after primary heating, depressurization and heat preservation, the solder has melted to a certain extent, but there may still be a situation that part of the solder is completely melted, and this situation may cause cold joint and missing joint of the sheet, so secondary heating and heat preservation are required. The secondary heating and heat preserving time can ensure complete melting of the solder, wherein the longer the length of the plate is, the longer the heat preserving time T3 is, and when the plate is made of 316L stainless steel, the preferable range of T1 is 1050-1150 ℃.
Depressurization cooling stage: the heating system is turned off, and the temperature in the brazing furnace is cooledCooling to a temperature T5, and then changing the pressure in the brazing furnace from 10 j Raising the temperature to 1/10 of the atmospheric pressure, reducing the temperature in the furnace to below 40 ℃ under 1/10 of the atmospheric pressure, and taking out the plate heat exchanger. In the cooling stage, the pressure average value in the brazing furnace is poor when the air cooling system is started, and the welding is basically finished, so that the vacuum degree in the brazing furnace can be reduced, and the pressure needs to be increased. The purpose of the pressure increase can also prevent deformation of the plate material of the plate heat exchanger.
In a more specific embodiment, the mode S2 includes:
and (3) vacuumizing: starting a vacuum pump of the brazing furnace to vacuumize, and not starting a heating system;
primary heating stage: when the vacuum degree in the brazing furnace reaches 10 a Starting a heating system, and heating the temperature in the brazing furnace to a temperature T within a set time period T; when the vacuum degree in the brazing furnace is less than 10 a When the vacuum is continuously pumped until the vacuum degree in the brazing furnace reaches 10 a Until that is reached;
depressurization and heat preservation: maintaining the temperature T unchanged, and using the time length of (2/3) T1 to ensure that the vacuum degree in the furnace is changed from 10 a Down to 10 k And maintaining the temperature T unchanged for a period of time from T1 to c 1;
and (3) a secondary heating and heat preservation stage: heating the temperature in the brazing furnace to a temperature T2 within a set time period T2, and maintaining the temperature T2 for a constant heat preservation time period T3-d1; t2 preferably ranges from 1000 to 1100 ℃.
Depressurization cooling stage: the heating system is turned off, the temperature in the brazing furnace is cooled to the temperature T5, and then the pressure in the brazing furnace is changed from 10 k Raising the temperature to 1/10 of the atmospheric pressure, reducing the temperature in the furnace to below 40 ℃ under 1/10 of the atmospheric pressure, and taking out the plate heat exchanger. The preferred range of k is (a-0.35) to (a-0.55).
In a more specific embodiment, the mode S3 includes:
and (3) vacuumizing: starting a vacuum pump of the brazing furnace to vacuumize, and not starting a heating system;
primary heating stage: when the vacuum degree in the brazing furnace reaches 10 a When the heating system is started, inHeating the temperature in the brazing furnace to a temperature T within a set time period T; when the vacuum degree in the brazing furnace is less than 10 a When the vacuum is continuously pumped until the vacuum degree in the brazing furnace reaches 10 a Until that is reached;
depressurization and heat preservation: maintaining the temperature T unchanged, and using the time length of (2/3) T1 to ensure that the vacuum degree in the furnace is changed from 10 a Down to 10 m And maintaining the temperature T unchanged for a period of time from T1 to c 2; preferred ranges for m are from (a-0.45) to (a-0.65).
And (3) a secondary heating and heat preservation stage: heating the temperature in the brazing furnace to a temperature T3 within a set time period T2, and maintaining the temperature T3 unchanged for a time period of T3-d 2; t3 preferably ranges from 950 to 1050 ℃.
Depressurization cooling stage: the heating system is turned off, the temperature in the brazing furnace is cooled to the temperature T5, and then the pressure in the brazing furnace is changed from 10 m Raising the temperature to 1/10 of the atmospheric pressure, reducing the temperature in the furnace to below 40 ℃ under 1/10 of the atmospheric pressure, and taking out the plate heat exchanger.
In a more specific embodiment, the mode S4 includes:
and (3) vacuumizing: starting a vacuum pump of the brazing furnace to vacuumize, and not starting a heating system;
primary heating stage: when the vacuum degree in the brazing furnace reaches 10 a Starting a heating system, and heating the temperature in the brazing furnace to a temperature T within a set time period T; when the vacuum degree in the brazing furnace is less than 10 a When the vacuum is continuously pumped until the vacuum degree in the brazing furnace reaches 10 a Until that is reached;
depressurization and heat preservation: maintaining the temperature T unchanged, and using the time length of (2/3) T1 to ensure that the vacuum degree in the furnace is changed from 10 a Down to 10 n And maintaining the temperature T unchanged for a period of time from T1 to c 3; the preferred range of n is (a-0.45) to (a-0.7).
And (3) a secondary heating and heat preservation stage: heating the temperature in the brazing furnace to a temperature T4 within a set time period T2, and maintaining the temperature T4 for a constant heat preservation time period T3-d3; t4 preferably ranges from 900 to 1000 ℃.
Depressurization cooling stage: closing the heating system to make the braze welding furnace in the furnaceCooling the temperature to a temperature T5 value, and then changing the furnace pressure of the brazing furnace from 10 n Raising the temperature to 1/10 of the atmospheric pressure, reducing the temperature in the furnace to below 40 ℃ under 1/10 of the atmospheric pressure, and taking out the plate heat exchanger.
Temperature, pressure and time control in the brazing process of the plate heat exchanger are affected by various factors, and if the control is improper in the actual adjusting process, the problems of the welding strength of the plate heat exchanger such as cold welding, missing welding and the like can be caused, on the other hand, the change of the temperature can also cause the structural deformation of welding materials in the welding process, and the improper rate adjustment can also extremely easily cause the problems of intergranular cracking such as abnormal structural deformation of the materials and the like. Therefore, the manufacturing method of the plate heat exchanger is obtained according to the characteristics of materials and the summary of welding process, and aims to improve the standardization degree and the automation degree of the welding process and ensure the quality of the plate heat exchanger.
The following specifically describes a detailed process flow of the manufacturing method of the present application, taking a plate heat exchanger in which a plate is made of stainless steel and a solder is copper as an example:
firstly, judging whether the length of the plate heat exchanger is larger than Xmm, when the length of a single plate heat exchanger is larger, the number of the plate heat exchangers in a furnace welded at a time is smaller, and on the premise of a certain length, the influence of the number of sheets on the heating and compression processes of the plate heat exchanger in the heating process is larger, and the interval range of length division is 300-500 mm, and the optimal value is 320mm.
When the length of the plate is larger than Xmm, the number of the plate heat exchanger plates is required to be determined, the mode S1 or the mode S2 is started respectively, the range of the discrimination value interval of the number of the plates is 50-80 plates, and the preferable value is 60 plates.
Further, when the length is smaller than Xmm, the number of the plate heat exchanger plates is required to be determined, and the mode S3 or the mode S4 is required to be started respectively, the range of the discrimination value Y of the number of the plates is 50-80 plates, preferably 60 plates, and whether the plate heat exchanger plates enter the mode S3 or the mode S4 is determined through discrimination Y+10.
Next, a specific process flow of S1, S2, S3, S4, is determined.
Further, in the entering mode S1, the heating system is not started, the vacuum pump is started, and the vacuum is pumped to a certain range of values, namely 10 a The reason why the heating is not turned on is that the sheet is easily oxidized under high temperature aerobic environment, wherein the value of the critical parameter a of the vacuum degree is in the range of 1.5-3, preferably 2.
Further, when the pressure value in the brazing furnace reaches a set value, the heating system is started, and the vacuum value in the furnace is kept unchanged through the cooperation of the pressure sensor in the furnace and the vacuum pump.
Further, after the heating system is started, tmin is used, the heating temperature is heated to T ℃, the time T is selected differently according to different stainless steel plates, the heating rate and the cooling rate of the 316L stainless steel are larger in adjusting range, and the heating rate is as high as possible under the condition that the tissue deformation is allowed, wherein the preferable range is 40-60 minutes, and the preferable range of the temperature T is 750-850 ℃.
Further, the heat preservation time T1min when the temperature T is heated is influenced by the size and the number of sheets of the plate heat exchanger, and the purpose of heat preservation in the section is mainly to ensure the temperature uniformity in the furnace. Wherein, t1 preferably ranges from 30 to 60 minutes, c1 and c2 preferably ranges from 5 to 8 minutes in mode S2 and mode S3, and c3 preferably ranges from 10 to 13 minutes in mode S4.
Further, the time T2min is used, the heating temperature is up to T1 ℃, the heat preservation time at T1 ℃ is T3min, and the purpose of the heat preservation time is to ensure melting of the solder, wherein the preferable range of T3min is 10-20 min, the preferable range of d1 and d2 is 3-5 min in the mode S2 and the mode S3, the preferable range of d3 is 4-6 min in the process S4, and the preferable range of T1 is 1050-1150 ℃.
At the same time, when the holding time is 2/3 of t1, the vacuum degree is reduced to the power j of 10 and kept unchanged, and the purpose of reducing the vacuum degree is to prevent excessive evaporation of the solder and the plate components. The preferred range of j is (a-0.3) to (a-0.5).
Further, the heating system is closed, the air cooling system of the brazing furnace is started, and the pressure in the furnace is increased to 1/10 of the atmospheric pressure when the temperature in the cooling furnace reaches the temperature T5 ℃ so as to reduce the vacuum degree. Wherein the preferable range of T5 is 300-900 ℃, and at this time, the average value of the pressure in the furnace is poor and the welding is basically completed when the air cooling system is started, so that the vacuum degree can be reduced.
Finally, the temperature is reduced to below 40 ℃ and the product is taken out.
Example 3
As shown in fig. 1-6, the present embodiment provides a system for producing a plate heat exchanger for carrying out the method of manufacturing a plate heat exchanger as described above.
The production system comprises a vacuum brazing furnace, wherein the vacuum brazing furnace comprises a heating system, a vacuumizing system and other structures. In the process of brazing the plate heat exchanger, the system can flexibly control the brazing temperature, vacuum degree and brazing time according to the conditions of products and production equipment, and ensure the brazing quality.
Example 4
As shown in fig. 1-6, the present embodiment provides a plate heat exchanger manufactured by the plate heat exchanger manufacturing system as described above.
The plate heat exchanger manufactured by the production system has the advantages of tight combination between the plates, high welding quality, reliable operation and higher heat exchange efficiency.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures. The foregoing description of the preferred embodiments of the invention is merely exemplary in nature and is in no way intended to limit the invention,
various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A manufacturing method of a plate heat exchanger, which is characterized in that the plate heat exchanger is brazed by a vacuum brazing furnace, comprising the following steps: selecting different operation modes of the vacuum brazing furnace according to the number of the plate heat exchangers in the vacuum furnace and the number A of the plates of the plate heat exchangers; the method specifically comprises the following steps: obtaining the volume V of the plate heat exchanger to be produced 1 The method comprises the steps of carrying out a first treatment on the surface of the Obtaining the volume V of a vacuum brazing furnace to be subjected to 2 The method comprises the steps of carrying out a first treatment on the surface of the According to V 1 、V 2 To judge the maximum number threshold N of the plate heat exchangers accommodated in the vacuum brazing furnace max The method comprises the steps of carrying out a first treatment on the surface of the Will N max The number of the heat exchangers in the vacuum furnace is considered; according to N max And the number of plates A of the plate heat exchanger, different operation modes of the vacuum brazing furnace are selected, wherein according to N max And the number A of the plates of the plate heat exchanger, selecting different operation modes of the vacuum brazing furnace, comprising: defining a ratio of the length L to the width W of the plate heat exchanger plates; acquiring the length L of a plate of the plate heat exchanger, and determining L and V 2 Is a relationship of (2); selecting different operation modes of the vacuum brazing furnace according to the length L of the plate sheets of the plate heat exchanger and the number A of the plate sheets of the plate heat exchanger, and selecting different operation modes of the vacuum brazing furnace according to the length L of the plate sheets of the plate heat exchanger and the number A of the plate sheets of the plate heat exchanger, wherein the operation modes comprise: judging whether L is larger than X, if yes, judging whether the number A of the plates of the plate heat exchanger is larger than Y; if the number A of the plates is larger than Y, selecting a mode S1; if the number A of the plates is smaller than Y, selecting an operation mode S2; in the mode S1 and the mode S2, the heat preservation time length of the depressurization heat preservation stage is different, and the heat preservation time length of the secondary heating heat preservation stage is different; judging whether L is larger than X, if not, judging whether the number A of the plates of the plate heat exchanger is larger than Y+10; if the number A of the plates is greater than Y+10, selecting a mode S3; if the number A of the plates is less than Y+10, selecting a modeS4；
Different operation modes are used for controlling different temperatures, vacuum degrees and brazing time in the brazing furnace, and the operation modes are control programs of a controller preset in the vacuum brazing furnace; the operation modes comprise a mode S1, a mode S2, a mode S3 and a mode S4, and each different operation mode comprises: a vacuumizing stage, a primary heating stage, a depressurization and heat preservation stage, a secondary heating and heat preservation stage and a depressurization and cooling stage; in different modes, the heat preservation duration of the depressurization heat preservation stage is different, and the heat preservation duration of the secondary heating heat preservation stage is different;
in the mode S3 and the mode S4, the heat preservation time length of the depressurization heat preservation stage is different, and the heat preservation time length of the secondary heating heat preservation stage is different; x is the preset value of the length of the plate sheets of the plate heat exchanger in the controller of the vacuum brazing furnace, the unit is mm, and Y is the preset value of the number of the plate sheets of the plate heat exchanger in the controller of the vacuum brazing furnace, and the unit is sheets.
2. A method of manufacturing a plate heat exchanger according to claim 1, wherein:
the pattern S1 includes:
and (3) vacuumizing: starting a vacuum pump of the brazing furnace to vacuumize, and not starting a heating system;
primary heating stage: when the vacuum degree in the brazing furnace reaches 10 a Starting a heating system, and heating the temperature in the brazing furnace to a temperature T within a set time period T; when the vacuum degree in the brazing furnace is less than 10 a When the vacuum is continuously pumped until the vacuum degree in the brazing furnace reaches 10 a Until that is reached;
depressurization and heat preservation: maintaining the temperature T unchanged, and using the time length of (2/3) T1 to ensure that the vacuum degree in the furnace is changed from 10 a Down to 10 j And keeping the temperature T unchanged for a period of time until T1;
and (3) a secondary heating and heat preservation stage: heating the temperature in the brazing furnace to a temperature T1 within a set time period T2, and maintaining the temperature T1 for a constant heat preservation time period T3;
depressurization cooling stage: the heating system is closed, and the temperature in the brazing furnace is cooled to be warmAt the temperature T5, the internal pressure of the brazing furnace is changed from 10 j Raising the temperature to 1/10 of the atmospheric pressure, reducing the temperature in the furnace to below 40 ℃ under 1/10 of the atmospheric pressure, and taking out the plate heat exchanger;
wherein, the units of t, t1, t2 and t3 are all minutes; units of T, T and T5 are all degrees centigrade; a. j is a natural number.
3. A method of manufacturing a plate heat exchanger according to claim 1, wherein:
the pattern S2 includes:
and (3) vacuumizing: starting a vacuum pump of the brazing furnace to vacuumize, and not starting a heating system;
primary heating stage: when the vacuum degree in the brazing furnace reaches 10 a Starting a heating system, and heating the temperature in the brazing furnace to a temperature T within a set time period T; when the vacuum degree in the brazing furnace is less than 10 a When the vacuum is continuously pumped until the vacuum degree in the brazing furnace reaches 10 a Until that is reached;
depressurization and heat preservation: maintaining the temperature T unchanged, and using the time length of (2/3) T1 to ensure that the vacuum degree in the furnace is changed from 10 a Down to 10 k And maintaining the temperature T unchanged for a period of time from T1 to c 1;
and (3) a secondary heating and heat preservation stage: heating the temperature in the brazing furnace to a temperature T2 within a set time period T2, and maintaining the temperature T2 for a constant heat preservation time period T3-d1;
depressurization cooling stage: the heating system is turned off, the temperature in the brazing furnace is cooled to the temperature T5, and then the pressure in the brazing furnace is changed from 10 k Raising the temperature to 1/10 of the atmospheric pressure, reducing the temperature in the furnace to below 40 ℃ under 1/10 of the atmospheric pressure, and taking out the plate heat exchanger;
wherein, the units of t, t1, t2 and t3 are all minutes; units of T, T and T5 are all degrees centigrade; a. k, c1, d1 are natural numbers.
4. A method of manufacturing a plate heat exchanger according to claim 1, wherein:
the pattern S3 includes:
and (3) vacuumizing: starting a vacuum pump of the brazing furnace to vacuumize, and not starting a heating system;
primary heating stage: when the vacuum degree in the brazing furnace reaches 10 a Starting a heating system, and heating the temperature in the brazing furnace to a temperature T within a set time period T; when the vacuum degree in the brazing furnace is less than 10 a When the vacuum is continuously pumped until the vacuum degree in the brazing furnace reaches 10 a Until that is reached;
depressurization and heat preservation: maintaining the temperature T unchanged, and using the time length of (2/3) T1 to ensure that the vacuum degree in the furnace is changed from 10 a Down to 10 m And maintaining the temperature T unchanged for a period of time from T1 to c 2;
and (3) a secondary heating and heat preservation stage: heating the temperature in the brazing furnace to a temperature T3 within a set time period T2, and maintaining the temperature T3 unchanged for a time period of T3-d 2;
depressurization cooling stage: the heating system is turned off, the temperature in the brazing furnace is cooled to the temperature T5, and then the pressure in the brazing furnace is changed from 10 m Raising the temperature to 1/10 of the atmospheric pressure, reducing the temperature in the furnace to below 40 ℃ under 1/10 of the atmospheric pressure, and taking out the plate heat exchanger;
wherein, the units of t, t1, t2 and t3 are all minutes; units of T, T and T5 are all degrees centigrade; a. m, c2, d2 are natural numbers.
5. A method of manufacturing a plate heat exchanger according to claim 1, wherein:
the pattern S4 includes:
and (3) vacuumizing: starting a vacuum pump of the brazing furnace to vacuumize, and not starting a heating system;
primary heating stage: when the vacuum degree in the brazing furnace reaches 10 a Starting a heating system, and heating the temperature in the brazing furnace to a temperature T within a set time period T; when the vacuum degree in the brazing furnace is less than 10 a When the vacuum is continuously pumped until the vacuum degree in the brazing furnace reaches 10 a Until that is reached;
depressurization and heat preservation: maintaining the temperature T unchanged, and using the time length of (2/3) T1 to ensure that the vacuum degree in the furnace is changed from 10 a Down to10 n And maintaining the temperature T unchanged for a period of time from T1 to c 3;
and (3) a secondary heating and heat preservation stage: heating the temperature in the brazing furnace to a temperature T4 within a set time period T2, and maintaining the temperature T4 for a constant heat preservation time period T3-d3;
depressurization cooling stage: the heating system is turned off, the temperature in the brazing furnace is cooled to the temperature T5, and then the pressure in the brazing furnace is changed from 10 n Raising the temperature to 1/10 of the atmospheric pressure, reducing the temperature in the furnace to below 40 ℃ under 1/10 of the atmospheric pressure, and taking out the plate heat exchanger;
wherein, the units of t, t1, t2 and t3 are all minutes; units of T, T and T5 are all degrees centigrade; a. n, c3, d3 are natural numbers.
6. A system for producing a plate heat exchanger, characterized by: the system being intended for carrying out a method of manufacturing a plate heat exchanger according to any one of claims 1-5.
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| JP2023106725A (en) * | 2022-01-21 | 2023-08-02 | 株式会社村田製作所 | heating furnace |
| CN114951872A (en) * | 2022-06-13 | 2022-08-30 | 贵州永红航空机械有限责任公司 | Vacuum brazing method for stainless steel plate fin type heat exchanger |
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