A brazing heating control method, device, equipment, medium and product

Abstract

The application discloses a brazing heating control method, device, equipment, medium and product, relates to the technical field of plate-fin heat exchanger manufacturing, and the method comprises the following steps: in the case that a workpiece connected with an external power supply is located in a vacuum brazing furnace, the external power supply and the workpiece are controlled to be in a conduction state, and the vacuum brazing furnace is started to heat the workpiece; the surface temperature and the heating time of the workpiece are monitored by using a monitoring device, and when the surface temperature of the workpiece reaches a preset threshold value and / or the heating time of the workpiece reaches a preset time length, the current of the external power supply and / or the heating power of the vacuum brazing furnace are adjusted; when the surface temperature of the workpiece reaches a target temperature value, the external power supply and the workpiece are controlled to be in an off state, and the vacuum brazing furnace is controlled to be in a working state. The application can reduce the temperature difference between the surface and the core of the workpiece and improve the heating efficiency of the workpiece.

Description

Technical Field

[0001] This application relates to the field of plate-fin heat exchanger manufacturing technology, and in particular to a brazing heating control method, apparatus, equipment, medium and product. Background Technology

[0002] Titanium alloy plate-fin heat exchangers consist of components such as fins, baffles, seals, and guide vanes. The fins are placed between the baffles, and the guide vanes and seals form a sandwich structure. Multiple sandwich structures are brazed together according to different fluid flow patterns to form a plate bundle. However, during the vacuum brazing heating process, due to the multi-layer combination, the self-shielding structure between the layers, and the low thermal conductivity of titanium alloy, the temperature difference between the surface and the core of the titanium alloy plate-fin heat exchanger is relatively large, resulting in low heating efficiency. Summary of the Invention

[0003] In view of the above-mentioned defects or deficiencies in the related technologies, the purpose of this application is to provide a brazing heating control method, apparatus, equipment, medium and product that can reduce the temperature difference between the surface and core of the workpiece and improve the heating efficiency of the workpiece.

[0004] To achieve the above objectives, this application provides the following solution:

[0005] In a first aspect, this application provides a brazing heating control method, comprising: when a workpiece connected to an external power source is located inside a vacuum brazing furnace, controlling the external power source to be in a conductive state with the workpiece, and starting the vacuum brazing furnace to heat the workpiece; the workpiece includes a plate-fin heat exchanger, an upper electrode plate disposed at one end of the plate-fin heat exchanger, and a lower electrode plate disposed at the other end of the plate-fin heat exchanger, the external power source being connected to the upper electrode plate and the lower electrode plate; monitoring the surface temperature and heating time of the workpiece using a monitoring device, and adjusting the current of the external power source and / or the heating power of the vacuum brazing furnace when the surface temperature of the workpiece reaches a preset threshold and / or the heating time of the workpiece reaches a preset time; and controlling the external power source to be in a switched-off state and the vacuum brazing furnace to be in a working state when the surface temperature of the workpiece reaches a target temperature value.

[0006] Optionally, when the external power supply and the workpiece are in a conductive state, the heat generation coefficient of the plate-fin heat exchanger is:

[0007]

[0008] Among them, R i The resistivity of titanium alloy, ρ i For the density of titanium alloy, C iL1 represents the specific heat capacity of the titanium alloy, L2 represents the fin thickness of the titanium alloy plate-fin heat exchanger, and L3 represents the fin spacing of the titanium alloy plate-fin heat exchanger.

[0009] Optionally, when the external power supply is in a conductive state with the workpiece, the heat generation coefficients of the upper electrode and the lower electrode are:

[0010]

[0011] Among them, R j ρ is the resistivity of the electrode material. j C is the density of the electrode material. j This represents the specific heat capacity of the plate material.

[0012] Optionally, adjusting the current of the external power supply and / or the heating power of the vacuum brazing furnace when the surface temperature of the workpiece reaches a preset threshold and / or the heating time of the workpiece reaches a preset time includes: adjusting the current of the external power supply so that the current density of the upper electrode plate and the lower electrode plate is in a first current density range when the heating time of the workpiece is in a first preset time range, and controlling the heating power of the vacuum brazing furnace to be in a first output power range; controlling the current of the external power supply to remain unchanged when the heating time of the workpiece is in a second preset time range, and controlling the heating power of the vacuum brazing furnace to be in a second output power range; adjusting the current of the external power supply so that the current density of the upper electrode plate and the lower electrode plate is in a second current density range when the heating time of the workpiece is in a third preset time range, and controlling the heating power of the vacuum brazing furnace to be in a third output power range.

[0013] Optionally, adjusting the current of the external power supply and / or the heating power of the vacuum brazing furnace when the surface temperature of the workpiece reaches a preset threshold and / or the heating time of the workpiece reaches a preset time includes: when the heating time of the workpiece is less than a first preset time, controlling the current of the external power supply to a first current and controlling the heating power of the vacuum brazing furnace to a first output power; when the heating time of the workpiece is greater than or equal to the first preset time and less than a second preset time, controlling the current of the external power supply to remain constant and controlling the heating power of the vacuum brazing furnace to linearly increase from the first output power to a second output power; when the heating time of the workpiece is greater than or equal to the second preset time and less than a third preset time, controlling the current of the external power supply to linearly decrease to a second current and remain constant, and controlling the heating power of the vacuum brazing furnace to linearly increase from the second output power to a third output power and remain constant.

[0014] Optionally, the step of controlling the external power supply and the workpiece to be in a turned-off state and controlling the vacuum brazing furnace to be in a working state when the surface temperature of the workpiece reaches the target temperature value includes: controlling the external power supply and the workpiece to be in a turned-off state and controlling the vacuum brazing furnace to heat the workpiece when the heating time of the workpiece is greater than or equal to the third preset time and the surface temperature of the workpiece reaches the first target temperature value; and controlling the vacuum brazing furnace to keep the workpiece warm when the surface temperature of the workpiece reaches the second target temperature value.

[0015] Secondly, this application provides a brazing heating control device, the brazing heating control device comprising:

[0016] The first control module is used to control the external power supply to be in a conductive state with the workpiece when the workpiece connected to the external power supply is located in the vacuum brazing furnace, and to start the vacuum brazing furnace to heat the workpiece; the workpiece includes a plate-fin heat exchanger, an upper electrode plate disposed at one end of the plate-fin heat exchanger, and a lower electrode plate disposed at the other end of the plate-fin heat exchanger, and the external power supply is connected to the upper electrode plate and the lower electrode plate.

[0017] The second control module is used to monitor the surface temperature and heating time of the workpiece using a monitoring device, and when the surface temperature of the workpiece reaches a preset threshold and / or the heating time of the workpiece reaches a preset time, adjust the current of the external power supply and / or the heating power of the vacuum brazing furnace.

[0018] The third control module is used to control the external power supply and the workpiece to be in a turned-off state and to control the vacuum brazing furnace to be in a working state when the surface temperature of the workpiece reaches the target temperature value.

[0019] Thirdly, this application provides a computer device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the brazing heating control method described in any one of the above.

[0020] Fourthly, this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the brazing heating control method described above.

[0021] Fifthly, this application provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the brazing heating control method described above.

[0022] According to the specific embodiments provided in this application, the following technical effects are disclosed:

[0023] This application provides a brazing heating control method, apparatus, equipment, medium, and product. By connecting the upper and lower plates of a plate-fin heat exchanger to an external power source, self-resistance heating of the workpiece can be achieved, rapidly increasing the core temperature of the plate-fin heat exchanger. Heating the workpiece in a vacuum brazing furnace can achieve radiant heating of the workpiece, thereby enabling brazing of the plate-fin heat exchanger. By combining self-resistance heating and radiant heating of the workpiece, the temperature difference between the workpiece surface and core can be effectively reduced, improving the workpiece's heating efficiency. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A schematic flowchart of a brazing heating control method provided in an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of a workpiece structure provided in an embodiment of this application;

[0027] Figure 3 Heating illustration provided for one embodiment of this application Figure 1 ;

[0028] Figure 4 Heating illustration provided for one embodiment of this application Figure 2 ;

[0029] Figure 5 This is a schematic diagram of the functional modules of a brazing heating control device provided in an embodiment of this application;

[0030] Figure 6 This is a schematic diagram of the structure of a computer device provided in an embodiment of this application.

[0031] Figure description: 201, upper electrode plate; 202, first alloy sheet; 203, plate-fin heat exchanger; 204, second alloy sheet; 205, lower electrode plate. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] In one exemplary embodiment, such as Figure 1 As shown, a brazing heating control method is provided. This method is executed by a computer device, specifically a terminal or server, or both. In this embodiment, the method can also be applied to the control system or control terminal of a vacuum brazing furnace. The brazing heating control method includes the following steps S110 to S130:

[0035] Step S110: When the workpiece connected to the external power supply is located inside the vacuum brazing furnace, control the external power supply and the workpiece to be in a conductive state, and start the vacuum brazing furnace to heat the workpiece.

[0036] In an example embodiment, the workpiece includes a plate-fin heat exchanger, an upper electrode plate disposed at one end of the plate-fin heat exchanger, and a lower electrode plate disposed at the other end of the plate-fin heat exchanger. Specifically, in one embodiment, neither the upper nor lower electrode plate is under load, and the upper and lower electrode plates contact the end faces of the plate-fin heat exchanger respectively by gravity, slight manufacturing tolerances, or preload; in the unloaded state, the relative displacement between the upper and lower electrode plates and the plate-fin heat exchanger is small or zero. In another embodiment, a certain load is applied to the upper and lower electrode plates by a press using a limiting method, so that in the loaded state, the upper electrode plate, the plate-fin heat exchanger, and the lower electrode plate are pressed together to form the workpiece. It should be noted that the displacement change of the upper electrode plate relative to the plate-fin heat exchanger and the lower electrode plate relative to the plate-fin heat exchanger is 0.5 mm between the unloaded state and the loaded state.

[0037] An external power supply is connected to the upper and lower electrodes. Specifically, in one embodiment, the upper electrode can be connected to the live wire of the external power supply, and the lower electrode can be connected to the neutral wire of the external power supply. In other embodiments, the upper electrode can also be connected to the neutral wire of the external power supply, and the lower electrode can also be connected to the live wire of the external power supply.

[0038] In other embodiments, if there is a load on the upper and lower electrode plates, to prevent the materials of the upper and lower electrode plates from contaminating the workpiece at high temperatures, the workpiece may further include a first alloy sheet and a second alloy sheet. That is, the first alloy sheet is disposed at one end of the plate-fin heat exchanger and located between the plate-fin heat exchanger and the upper electrode plate, and the second alloy sheet is located at the other end of the plate-fin heat exchanger and located between the plate-fin heat exchanger and the lower electrode plate. Specifically, as shown... Figure 2 As shown, a certain pressure is applied to the upper electrode plate 201 and the lower electrode plate 205 by a press, so that the upper electrode plate 201, the first alloy sheet 202, the plate-fin heat exchanger 203, the second alloy sheet 204, and the lower electrode plate 205 are pressed together to form a workpiece.

[0039] In this embodiment of the application, after connecting the workpiece to an external power source, the workpiece needs to be placed in a vacuum environment with a vacuum level of 1.33 × 10⁻⁶. -2 Up to 1.33×10 -3 Inside the vacuum brazing furnace, the external power supply is then controlled to be in a conductive state with the upper and lower plates. In the conductive state, the external power supply applies a certain voltage to the upper and lower plates, allowing the plate-fin heat exchanger to raise the core temperature of the plate-fin heat exchanger through self-resistance heating.

[0040] It should be noted that after placing the workpiece in the vacuum brazing furnace, the external power supply and the workpiece can be connected to achieve self-resistance heating of the plate-fin heat exchanger. After heating for a period of time, the vacuum brazing furnace can be started to radiate heat to the plate-fin heat exchanger. Alternatively, the external power supply and the workpiece can be connected at the same time, and the vacuum brazing furnace can be turned on to achieve both self-resistance heating and radiate heating of the plate-fin heat exchanger.

[0041] Furthermore, in this embodiment of the application, the plate-fin heat exchanger is a titanium alloy plate-fin heat exchanger. In the conductive state, the heat generation coefficient (h) of the plate-fin heat exchanger is... i )for:

[0042]

[0043] Among them, R i The resistivity of titanium alloy, ρ i For the density of titanium alloy, C i L1 represents the specific heat capacity of the titanium alloy, L2 represents the fin thickness of the titanium alloy plate-fin heat exchanger, and L3 represents the fin spacing of the titanium alloy plate-fin heat exchanger.

[0044] Furthermore, in this embodiment, the upper and lower electrode plates can be made of SiC, and the first and second alloy sheets can be titanium foil or titanium alloy sheets. When the external power supply and the workpiece are in a conductive state, the heat generation coefficients (h) of the upper and lower electrode plates are... j )for:

[0045]

[0046] Among them, R j ρ is the resistivity of the electrode material. j C is the density of the electrode material. j This represents the specific heat capacity of the plate material.

[0047] Based on the above, for example, the dimensions of the titanium alloy plate-fin heat exchanger are: 320mm × 280mm × 460mm; the fin thickness of the titanium alloy plate-fin heat exchanger is: 0.1mm; the fin spacing of the titanium alloy plate-fin heat exchanger is 1.3mm; and the materials and material parameters of the plate-fin heat exchanger, upper plate, and lower plate are shown in the following figure:

[0048]

[0049] Therefore, the heat generation coefficient (h) of the titanium alloy plate-fin heat exchanger i The value is 1.21 × 10 -7 The heat production coefficients of the upper and lower plates are (h) j The value is 1.26 × 10 -7 .

[0050] It should be noted that, in order to ensure the brazing quality of the titanium alloy plate-fin heat exchanger, the vacuum level in the vacuum brazing furnace needs to be maintained at 0.01 Pa in this embodiment of the application.

[0051] By introducing the heat production coefficient (h) j The materials of the upper and lower plates are specified, enabling them to have a heat generation efficiency similar to that of titanium alloy plate-fin heat exchangers. This allows for synchronous heating of the upper and lower plates with the titanium alloy plate-fin heat exchanger, reducing the excessive temperature difference in the vertical direction caused by heat absorption by the upper and lower plates, thereby improving the temperature uniformity of the titanium alloy plate-fin heat exchanger during the heating process.

[0052] Step S120: The surface temperature and heating time of the workpiece are monitored using a monitoring device, and when the surface temperature of the workpiece reaches a preset threshold and / or the heating time of the workpiece reaches a preset time, the current of the external power supply and / or the heating power of the vacuum brazing furnace are adjusted.

[0053] In an example embodiment, the monitoring device may include a device for monitoring the surface temperature of a workpiece and a timing device for monitoring the heating duration. The device for monitoring the surface temperature of the workpiece may be a thermocouple or a radiation thermometer; the timing device for monitoring the heating duration may be a timer. In other embodiments, the monitoring device may also be a device for monitoring the surface temperature of the workpiece and a code timer for monitoring the heating duration.

[0054] During the heating of a plate-fin heat exchanger in a vacuum brazing furnace, to ensure heating efficiency and brazing quality, a monitoring device is needed to monitor the workpiece surface temperature and heating time. This allows for timely adjustments to the external power supply current and the vacuum brazing furnace's output power.

[0055] In one embodiment, the step S120 above, which involves adjusting the current of the external power supply and / or the heating power of the vacuum brazing furnace when the surface temperature of the workpiece reaches a preset threshold and / or the heating time of the workpiece reaches a preset time, may include steps S1201 to S1203, specifically:

[0056] Step S1201: When the heating time of the workpiece is within the first preset time range, adjust the current of the external power supply so that the current density of the upper electrode plate and the lower electrode plate is within the first current density range, and control the heating power of the vacuum brazing furnace to be within the first output power range.

[0057] In the example embodiment, the first preset duration interval is [0, 120], that is, the first preset duration is greater than or equal to 0 seconds and less than or equal to 120 seconds; the first current density interval is [1×10]. 5 1.3×10 5 That is, the first current density is greater than or equal to 1×10⁻⁶. 5 A / m 2 Less than or equal to 1.3 × 10 5 A / m 2 The first output power range is [0.1P, 0.3P], that is, the first output power is greater than or equal to 10% of the rated output power of the vacuum brazing furnace and less than or equal to 30% of the rated output power of the vacuum brazing furnace.

[0058] Understandably, for example, after starting the vacuum brazing furnace, the current to the external power supply increases linearly from 0 seconds to 120 seconds, causing the resistance heating current density on the upper and lower electrodes to be 1×10⁻⁶. 5 A / m 2 Up to 1.3×10 5 A / m 2 Between these points, the output power of the vacuum brazing furnace is linearly increased, so that the output power of the vacuum brazing furnace is within 10% to 30% of the rated output of the vacuum brazing furnace.

[0059] In step S1202, when the heating time of the workpiece is within the second preset time range, the current of the external power supply is kept constant, and the heating power of the vacuum brazing furnace is controlled to be within the second output power range.

[0060] In the example embodiment, the second preset duration range is [0, 200], that is, the second preset duration is greater than or equal to 0S and less than or equal to 200S; the second output power range is [0.2P, 0.6P], that is, the second output power is greater than or equal to 20% of the rated output power of the vacuum brazing furnace and less than or equal to 60% of the rated output power of the vacuum brazing furnace.

[0061] Understandably, for example, after heating for 0 to 120 seconds, the output power of the vacuum brazing furnace is increased or linearly increased within a time period of 0 to 200 seconds, so that the output power of the vacuum brazing furnace is between 20% and 60% of the rated output power. The current of the external power supply remains constant, so that the resistance heating current density on the upper and lower electrodes remains at 1 × 10⁻⁶. 5 A / m 2 Up to 1.3×10 5 A / m 2 between.

[0062] Step S1203: When the heating time of the workpiece is within the third preset time range, adjust the current of the external power supply so that the current density of the upper and lower plates is within the second current density range, and control the heating power of the vacuum brazing furnace to be within the third output power range.

[0063] In the example embodiment, the third preset duration interval is [0, 400], that is, the third preset duration is greater than or equal to 0 seconds and less than or equal to 400 seconds; the second current density interval is [0, 1.0 × 10⁻⁶]. 3 That is, the second current density is greater than or equal to 0 A / m 2 Less than or equal to 1.0 × 10 3 A / m 2 The third output power range is [0.6P, 0.85P], that is, the third output power is greater than or equal to 60% of the rated output power of the vacuum brazing furnace and less than or equal to 30% or 85% of the rated output power of the vacuum brazing furnace.

[0064] Understandably, after heating for 0 to 200 seconds, the current to the external power supply is linearly reduced until it is turned off within 0 to 400 seconds, so that the resistance heating current density on the upper and lower plates remains at 0 A / m. 2 Up to 1.0×10 3 A / m 2 Within; the output power of the vacuum brazing furnace is increased or linearly increased so that the output power of the vacuum brazing furnace is between 60% and 85% of the rated output power.

[0065] It should be noted that when the workpiece surface temperature reaches the target temperature value, the external power supply is switched off from the upper and lower electrode plates. The target temperature value ranges from greater than or equal to the brazing temperature -100℃ to less than or equal to the brazing temperature -200℃. When heating the workpiece within the aforementioned preset time intervals, the heating temperature is linearly increased or decreased based on the previous heating temperature. Furthermore, in this embodiment, the rated output power of the vacuum brazing furnace is 140kW. The maximum self-resistance heating power generated by the upper and lower electrode plates is 30kW. In addition, to ensure stable heating power, the external power supply in this embodiment can be a DC power supply.

[0066] In another embodiment, the step S120 above, which involves adjusting the current of the external power supply and / or the heating power of the vacuum brazing furnace when the surface temperature of the workpiece reaches a preset threshold and / or the heating time of the workpiece reaches a preset time, may include steps S1210 to S1230, specifically:

[0067] In step S1210, when the heating time of the workpiece is less than the first preset time, the current of the external power supply is controlled to be the first current, and the heating power of the vacuum brazing furnace is controlled to be the first output power.

[0068] In the example embodiment, the first preset duration is 130 seconds; the first current is 10,000 A; and the first output power is 20 kW.

[0069] Understandably, for example, the heating time increases from 0 seconds to 130 seconds, the current of the external power supply remains constant at 10,000 A, and the heating power of the vacuum brazing furnace remains constant at 20 kW.

[0070] In step S1220, when the workpiece heating time is greater than or equal to the first preset time and less than the second preset time, the current of the external power supply is kept constant, and the heating power of the vacuum brazing furnace is linearly increased from the first output power to the second output power.

[0071] In the example embodiment, the second preset duration is 200 seconds; the second output power is 85 kW.

[0072] Understandably, for example, the heating time is increased from 130S to 200S, the current of the external power supply is kept constant at 10000A, and the heating power of the vacuum brazing furnace is controlled to become 50kW at 130S. Then it increases linearly with the heating time, with an increase of 0.5kW / S, until it increases to 85kW.

[0073] In step S1230, when the heating time of the workpiece is greater than or equal to the second preset time and less than the third preset time, the current of the external power supply is controlled to decrease linearly to the second current and remain unchanged, and the heating power of the vacuum brazing furnace is controlled to increase linearly from the second output power to the third output power and remain unchanged.

[0074] In the example embodiment, the third preset duration is 400 seconds; the second current is 1000A; and the third output power is 130kW.

[0075] Understandably, for example, when the heating time increases from 200S to 400S, the current of the external power supply changes to 5200A at 200S, and then the current of the external power supply decreases linearly with the heating time, by 20A / S, and remains constant after decreasing to 1000A; the heating power of the vacuum brazing furnace increases linearly with the heating time, by 0.5kW / S, and remains constant after increasing to 130kW.

[0076] Combining the above embodiments and Figure 3 , Figure 4 Understandably, when the vacuum brazing furnace starts heating, the temperature inside the furnace is low, and the workpiece's self-resistance heating causes it to heat up rapidly. At this time, the radiant heating of the vacuum brazing furnace mainly heats the furnace chamber, effectively reducing surface heat loss from the plate-fin heat exchanger. At this point, the maximum temperature difference between the workpiece's core and surface is ≤19℃. During the 130-200 second heating phase, due to the rapid temperature rise caused by the workpiece's self-resistance heating, the core temperature is higher than the surface temperature. Increasing the radiant heating power of the vacuum brazing furnace can raise the workpiece's surface temperature, reducing the temperature difference between the core and surface. At this point, the core and surface temperatures remain at a relatively low level, approximately 15℃. During the heating phase from 200 to 400 seconds, the increase in radiant heating from the vacuum brazing furnace is no longer comparable to the self-resistance heating of the workpiece. Therefore, while increasing the output power of the vacuum brazing furnace, the current of the external power supply is reduced to decrease the self-resistance heating power of the workpiece. At this point, the workpiece heating rate is slightly lower than before, and the maximum temperature difference between the core and surface of the workpiece is ≤24℃. This effectively reduces the temperature difference between the surface and core of the workpiece, improving the heating efficiency.

[0077] Furthermore, in the range of 0S to 130S, the workpiece is heated by self-resistance heating and low-power radiation heating; in the range of 130S to 200S, the rapid heating stage is adopted. Before the rapid heating stage, self-resistance heating and low-power radiation heating are used to reduce the problem of excessive temperature difference between the side surface temperature and the core temperature of the plate-fin heat exchanger caused by radiation heating alone, thereby improving the temperature uniformity of the plate-fin heat exchanger during rapid heating.

[0078] Furthermore, since the workpiece is heated by a combination of self-resistance heating and radiation heating, the temperature difference between the surface temperature and the core temperature of the workpiece can be effectively reduced during the heating process, thereby significantly improving the heating efficiency of the workpiece.

[0079] Step S130: When the surface temperature of the workpiece reaches the target temperature value, control the external power supply and the workpiece to be in a turned-off state and control the vacuum brazing furnace to be in a working state.

[0080] Specifically, when the heating time of the workpiece is greater than or equal to the third preset time and the surface temperature of the workpiece reaches the first target temperature value, the external power supply and the workpiece are controlled to be turned off, and the vacuum brazing furnace is controlled to heat the workpiece; when the surface temperature of the workpiece reaches the second target temperature value, the vacuum brazing furnace is controlled to keep the workpiece warm.

[0081] In the example embodiment, the first target temperature value is 600-750°C; the second target temperature value is 800-900°C.

[0082] As can be understood from the above embodiments, for example, when the external power supply and the workpiece are in a conductive state, the workpiece achieves self-resistance heating. When the workpiece heating time exceeds 400 seconds and the surface temperature of the workpiece reaches 700°C, the external power supply is turned off, so that the external power supply and the workpiece are in a de-energized state, and the workpiece no longer undergoes self-resistance heating. The vacuum brazing furnace is controlled to continue heating the workpiece, that is, to perform radiant heating on the workpiece. When the surface temperature of the workpiece reaches 870°C, the vacuum brazing furnace is controlled to keep the workpiece warm.

[0083] In other embodiments, after the workpiece has been held in the vacuum brazing furnace for 80 minutes, the plate-fin heat exchanger needs to be brazed. After the plate-fin heat exchanger is brazed, the workpiece can be naturally cooled using the furnace chamber of the vacuum brazing furnace, or an inert gas can be introduced into the vacuum brazing furnace for cooling. For example, argon gas can be introduced into the vacuum brazing furnace to achieve rapid cooling of the workpiece.

[0084] By implementing steps S110 to S130 above, connecting the upper and lower plates on the plate-fin heat exchanger to an external power source enables self-resistance heating of the workpiece, rapidly increasing the core temperature of the plate-fin heat exchanger. Heating the workpiece in a vacuum brazing furnace enables radiant heating of the workpiece, thereby achieving brazing of the plate-fin heat exchanger. By combining self-resistance heating and radiant heating of the workpiece, the temperature difference between the surface and core of the workpiece can be effectively reduced, improving the workpiece's heating efficiency.

[0085] Based on the same inventive concept, this application also provides a brazing heating control device for implementing the aforementioned brazing heating control method. The solution provided by this device is similar to the solution described in the above method; therefore, the specific limitations of one or more brazing heating control device embodiments provided below can be found in the limitations of the heat exchanger heating control method described above, and will not be repeated here.

[0086] In one exemplary embodiment, such as Figure 5 As shown, a heating control device 500 for a heat exchanger includes: a first control module 510, a second control module 520, and a third control module 530; specifically,

[0087] The first control module 510 is used to control the external power supply and the workpiece to be in a conductive state when the workpiece connected to the external power supply is located in the vacuum brazing furnace; the workpiece includes a plate-fin heat exchanger, an upper electrode plate disposed at one end of the plate-fin heat exchanger and a lower electrode plate disposed at the other end of the plate-fin heat exchanger, and the external power supply is connected to the upper electrode plate and the lower electrode plate.

[0088] The second control module 520 is used to monitor the surface temperature and heating time of the workpiece using a monitoring device when the workpiece is heated in a vacuum brazing furnace, and to adjust the current of the external power supply and / or the heating power of the vacuum brazing furnace when the surface temperature of the workpiece reaches a preset threshold and / or the heating time of the workpiece reaches a preset time.

[0089] The third control module 530 is used to control the external power supply and the workpiece to be in a turned-off state and to control the vacuum brazing furnace to be in a working state when the surface temperature of the workpiece reaches the target temperature value.

[0090] As an optional implementation, when the external power supply and the workpiece are in a conductive state, the heat generation coefficient of the plate-fin heat exchanger is:

[0091]

[0092] Among them, R i The resistivity of titanium alloy, ρ i For the density of titanium alloy, C i L1 represents the specific heat capacity of the titanium alloy, L2 represents the fin thickness of the titanium alloy plate-fin heat exchanger, and L3 represents the fin spacing of the titanium alloy plate-fin heat exchanger.

[0093] As an optional implementation, when the external power supply and the workpiece are in a conductive state, the heat generation coefficients of the upper and lower electrodes are:

[0094]

[0095] Among them, R j ρ is the resistivity of the electrode material.j C is the density of the electrode material. j This represents the specific heat capacity of the plate material.

[0096] As an optional implementation, the second control module 520 is further configured to: adjust the current of the external power supply so that the current density of the upper and lower electrodes is in the first current density range when the heating time of the workpiece is within the first preset time range, and control the heating power of the vacuum brazing furnace to be in the first output power range; control the current of the external power supply to remain unchanged when the heating time of the workpiece is within the second preset time range, and control the heating power of the vacuum brazing furnace to be in the second output power range; and adjust the current of the external power supply so that the current density of the upper and lower electrodes is in the second current density range when the heating time of the workpiece is within the third preset time range, and control the heating power of the vacuum brazing furnace to be in the third output power range.

[0097] As an optional implementation, the second control module 520 is further configured to: control the current of the external power supply to a first current and control the heating power of the vacuum brazing furnace to a first output power when the heating time of the workpiece is less than a first preset time; control the current of the external power supply to remain unchanged and control the heating power of the vacuum brazing furnace to linearly increase from the first output power to the second output power when the heating time of the workpiece is greater than or equal to the first preset time and less than a second preset time; and control the current of the external power supply to linearly decrease to a second current and remain unchanged when the heating time of the workpiece is greater than or equal to the second preset time and less than a third preset time, and control the heating power of the vacuum brazing furnace to linearly increase from the second output power to the third output power and remain unchanged.

[0098] As an optional implementation, the third control module 530 is further configured to: control the external power supply and the workpiece to be in a turned-off state when the heating time of the workpiece is greater than or equal to a third preset time and the surface temperature of the workpiece reaches a first target temperature value; and control the vacuum brazing furnace to heat the workpiece; and control the vacuum brazing furnace to keep the workpiece warm when the surface temperature of the workpiece reaches a second target temperature value.

[0099] In one exemplary embodiment, a computer device is provided, which may be a server or a terminal, and its internal structure diagram may be as follows. Figure 6As shown, this computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The database stores video tag processing data. The I / O interfaces are used for exchanging information between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When executed by the processor, the computer program implements a brazing heating control method.

[0100] Those skilled in the art will understand that Figure 6 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0101] In one exemplary embodiment, a computer device is also provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in the above-described method embodiments.

[0102] In one exemplary embodiment, a computer-readable storage medium is provided storing a computer program that, when executed by a processor, implements the steps in the above-described method embodiments.

[0103] In one exemplary embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in the above-described method embodiments.

[0104] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data must comply with relevant regulations.

[0105] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM).

[0106] The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0107] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0108] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A method of brazing heating control, characterized by, The brazing heating control method comprises: In the case that the workpiece connected with the external power supply is located in the vacuum brazing furnace, the external power supply and the workpiece are controlled to be in a conduction state, and the vacuum brazing furnace is started to heat the workpiece; the workpiece comprises a plate-fin heat exchanger, an upper end plate arranged at one end of the plate-fin heat exchanger, and a lower end plate arranged at the other end of the plate-fin heat exchanger, and the external power supply is connected with the upper end plate and the lower end plate; in the conduction state, the external power supply is controlled to apply voltage to the upper end plate and the lower end plate to perform self-resistance heating on the plate-fin heat exchanger; The surface temperature and heating time of the workpiece are monitored by a monitoring device, and when the surface temperature of the workpiece reaches a preset threshold value and / or the heating time of the workpiece reaches a preset time length, the current of the external power supply and / or the heating power of the vacuum brazing furnace are adjusted; When the surface temperature of the workpiece reaches a target temperature value, the external power supply and the workpiece are controlled to be in an off state, and the vacuum brazing furnace is controlled to be in a working state; The adjustment of the current of the external power supply and / or the heating power of the vacuum brazing furnace when the surface temperature of the workpiece reaches a preset threshold value and / or the heating time of the workpiece reaches a preset time length comprises: In a case where the heating duration of the workpiece is located in a first preset duration interval, the current of the external power supply is adjusted to make the current density of the upper and lower electrode plates be in a first current density interval, and the heating power of the vacuum brazing furnace is controlled to be in a first output power interval; the first preset duration interval is [0S, 120S], the first current density interval is [1×10 5 A / m 2 , the first output power interval is [0.1P, 0.3P]. 5 A / m 2 ​ When the heating time of the workpiece is in a second preset time length interval, the current of the external power supply is controlled to remain unchanged, and the heating power of the vacuum brazing furnace is controlled to be in a second output power interval; the second preset time length interval is [0S, 200S], and the first output power interval is [0.2P, 0.6P]; when the heating duration of the workpiece is in a third preset duration interval, adjusting the current of the external power supply to make the current density of the upper plate and the lower plate be in a second current density interval, and controlling the heating power of the vacuum brazing furnace to be in a third output power interval; the third preset duration interval is [0S, 400S], the second current density interval is [0, 1.0x10 3 A / m 2 ], and the third output power interval is [0.6P, 0.85P]; or, When the heating time of the workpiece is less than a first preset time length, the current of the external power supply is controlled to be a first current, and the heating power of the vacuum brazing furnace is controlled to be a first output power; the first preset time length is 130S, the first current is 10000A, and the first output power is 20kW; When the heating time of the workpiece is greater than or equal to the first preset time length and less than a second preset time length, the current of the external power supply is controlled to remain unchanged, and the heating power of the vacuum brazing furnace is controlled to linearly increase from the first output power to a second output power; the second preset time length is 200S, and the second output power is 85kw; When the heating time of the workpiece is greater than or equal to the second preset time length and less than a third preset time length, the current of the external power supply is controlled to linearly decrease to a second current and remain unchanged, and the heating power of the vacuum brazing furnace is controlled to linearly increase from the second output power to a third output power and remain unchanged; the third preset time length is 400S, the second current is 1000A, and the third output power is 130kw.

2. The soldering heat control method according to claim 1, wherein When the external power supply and the workpiece are in the conduction state, the heat generation coefficient of the plate-fin heat exchanger is: ； wherein, is the electrical resistivity of the titanium alloy, is the density of the titanium alloy, is the specific heat capacity of the titanium alloy, is the fin thickness of the titanium alloy plate-fin heat exchanger, is the fin pitch of the titanium alloy plate-fin heat exchanger.

3. The soldering heat control method according to claim 2, wherein When the external power supply and the workpiece are in the conduction state, the heat generation coefficient of the upper end plate and the lower end plate is: ； wherein, is the resistivity of the plate material, is the density of the plate material, is the specific heat capacity of the plate material.

4. The soldering heat control method according to claim 1, characterized by, The control of the external power supply and the workpiece in the off state and the control of the vacuum brazing furnace in the working state when the surface temperature of the workpiece reaches the target temperature value, comprising: When the heating duration of the workpiece is greater than or equal to the third preset duration and the surface temperature of the workpiece reaches the first target temperature value, the external power supply and the workpiece are controlled in the off state, and the vacuum brazing furnace is controlled to heat the workpiece. When the surface temperature of the workpiece reaches the second target temperature value, the vacuum brazing furnace is controlled to heat the workpiece.

5. A soldered heating control device, characterized by The brazing heating control device comprises: The first control module is used for controlling the external power supply and the workpiece in the on state when the workpiece connected with the external power supply is located in the vacuum brazing furnace, and starting the vacuum brazing furnace to heat the workpiece; the workpiece comprises a plate-fin heat exchanger, an upper plate arranged at one end of the plate-fin heat exchanger and a lower plate arranged at the other end of the plate-fin heat exchanger, and the external power supply is connected with the upper plate and the lower plate; in the on state, the external power supply is controlled to apply voltage to the upper plate and the lower plate to perform self-resistance heating on the plate-fin heat exchanger; The second control module is configured to monitor the surface temperature of the workpiece and the heating time by using the monitoring device, and adjust the current of the external power supply and / or the heating power of the vacuum brazing furnace when the surface temperature of the workpiece reaches a preset threshold and / or the heating time of the workpiece reaches a preset time length. Specifically, when the heating time of the workpiece is in a first preset time length interval, the current of the external power supply is adjusted to make the current density of the upper and lower plates be in a first current density interval, and the heating power of the vacuum brazing furnace is controlled to be in a first output power interval; the first preset time length interval is [0S, 120S], the first current density interval is [1×10 5 A / m 2 , 1.3×10 5 A / m 2 ], and the first output power interval is [0.1P, 0.3P]; when the heating time of the workpiece is in a second preset time length interval, the current of the external power supply is kept unchanged, and the heating power of the vacuum brazing furnace is controlled to be in a second output power interval; the second preset time length interval is [0S, 200S], and the first output power interval is [0.2P, 0.6P]; when the heating time of the workpiece is in a third preset time length interval, the current of the external power supply is adjusted to make the current density of the upper and lower plates be in a second current density interval, and the heating power of the vacuum brazing furnace is controlled to be in a third output power interval; the third preset time length interval is [0S, 400S], the second current density interval is [0, 1.0×10 3 A / m 2 ], and the third output power interval is [0.6P, 0.85P]; or, when the heating time of the workpiece is less than a first preset time length, the current of the external power supply is controlled to be a first current, and the heating power of the vacuum brazing furnace is controlled to be a first output power; the first preset time length is 130S, the first current is 10000A, and the first output power is 20kW; when the heating time of the workpiece is greater than or equal to the first preset time length and less than a second preset time length, the current of the external power supply is kept unchanged, and the heating power of the vacuum brazing furnace is linearly increased from the first output power to a second output power; the second preset time length is 200S, and the second output power is 85kw; when the heating time of the workpiece is greater than or equal to the second preset time length and less than a third preset time length, the current of the external power supply is linearly reduced to a second current and kept unchanged, and the heating power of the vacuum brazing furnace is linearly increased from the second output power to a third output power and kept unchanged; the third preset time length is 400S, the second current is 1000A, and the third output power is 130kw. The third control module is used for controlling the external power supply and the workpiece in the off state and controlling the vacuum brazing furnace in the working state when the surface temperature of the workpiece reaches the target temperature value.

6. A computer device comprising: The memory, the processor and the computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to realize the steps of the brazing heating control method in any one of claims 1-4.

7. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to realize the steps of the brazing heating control method in any one of claims 1-4.

8. A computer program product comprising a computer program, characterized in that, The computer program is executed by the processor to realize the steps of the brazing heating control method in any one of claims 1-4.

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