Brazing heating control method, device, equipment, medium and product

Abstract

The invention discloses a brazing heating control method, device and equipment, a medium and a product, and relates to the technical field of plate-fin heat exchanger manufacturing. The method comprises the steps that under the condition that a workpiece connected with an external power source is located in a vacuum brazing furnace, the external power source 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 duration of the workpiece are monitored through a monitoring device, and when the surface temperature of the workpiece reaches a preset threshold value and / or the heating duration of the workpiece reaches a preset duration, the current of an external power source and / or the heating power of a vacuum brazing furnace are / is adjusted; and when the surface temperature of the workpiece reaches the target temperature value, the external power source and the workpiece are controlled to be in a turn-off state, and the vacuum brazing furnace is controlled to be in a working state. The temperature difference between the surface and the center of the workpiece can be reduced, and the heating efficiency of the workpiece is improved.

Description

Technical Field

[0001] The present application relates to the technical field of plate-fin heat exchanger manufacturing, and in particular to a brazing heating control method, device, equipment, medium and product. Background Art

[0002] The titanium alloy plate-fin heat exchanger is composed of fins, partitions, seals, guide vanes and other parts. The fins are placed between the partitions, and the guide vanes and seals form a sandwich. Many sandwiches are brazed together in different ways of fluid circulation 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 the titanium alloy, the temperature difference between the surface and the core of the titanium alloy plate-fin heat exchanger is large, and the heating efficiency is low. Summary of the invention

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

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

[0005] In a first aspect, the present application provides a brazing heating control method, which comprises: when a workpiece connected to an external power supply is located in a vacuum brazing furnace, controlling the external power supply and the workpiece to be in a conductive state, and starting the vacuum brazing furnace to heat the workpiece; the workpiece comprises a plate-fin heat exchanger, an upper electrode plate arranged at one end of the plate-fin heat exchanger, and a lower electrode plate arranged 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; using a monitoring device to monitor the surface temperature and heating time of the workpiece, 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, 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 target temperature value, controlling the external power supply and the workpiece to be in a closed state and controlling the vacuum brazing furnace to be in a working state.

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

[0007]

[0008] Among them, R i is the resistivity of titanium alloy, ρ i is the density of titanium alloy, C iis the specific heat capacity of titanium alloy, L1 is the fin thickness of titanium alloy plate-fin heat exchanger, and L2 is the fin spacing of titanium alloy plate-fin heat exchanger.

[0009] Optionally, when the external power source and the workpiece are in a conducting state, the heat generation coefficient of the upper plate and the lower plate is:

[0010]

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

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

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

[0014] Optionally, when the surface temperature of the workpiece reaches the 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 an operating state, including: 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 in an 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 keep the workpiece warm.

[0015] In a second aspect, the present 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 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, and start the vacuum brazing furnace to heat the workpiece; the workpiece includes 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 to the upper plate and the lower plate;

[0017] A second control module is used to monitor the surface temperature and heating time of the workpiece 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, 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 shut-off state and control the vacuum brazing furnace to be in a working state when the surface temperature of the workpiece reaches a target temperature value.

[0019] In a third aspect, the present application provides a computer device, comprising: 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 any one of the brazing heating control methods described above.

[0020] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of any one of the brazing heating control methods described above are implemented.

[0021] In a fifth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of any one of the brazing heating control methods described above.

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

[0023] The present application provides a brazing heating control method, device, equipment, medium and product. By connecting the upper electrode plate and the lower electrode plate arranged on the plate-fin heat exchanger with an external power supply, self-resistance heating of the workpiece can be realized, and the core temperature of the plate-fin heat exchanger can be quickly increased; by heating the workpiece in a vacuum brazing furnace, radiation heating of the workpiece can be realized, and then the brazing of the plate-fin heat exchanger can be realized; by heating the workpiece in a heating method combining self-resistance heating and radiation heating, the temperature difference between the surface and the core of the workpiece can be effectively reduced, and the heating efficiency of the workpiece can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic flow chart of a brazing heating control method provided in one embodiment of the present application;

[0026] Figure 2 A schematic diagram of a workpiece structure provided in one embodiment of the present application;

[0027] Figure 3 A heating schematic diagram provided in an embodiment of the present application Figure 1 ;

[0028] Figure 4 A heating schematic diagram provided in an embodiment of the present application Figure 2 ;

[0029] Figure 5 A schematic diagram of the functional modules of a brazing heating control device provided in one embodiment of the present application;

[0030] Figure 6 A schematic diagram of the structure of a computer device provided in one embodiment of the present application.

[0031] Description of the drawings: 201, upper electrode plate; 202, first alloy sheet; 203, plate-fin heat exchange; 204, second alloy sheet; 205, lower electrode plate. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0034] In an exemplary embodiment, Figure 1 As shown, a brazing heating control method is provided, which is executed by a computer device, specifically, it can be executed by a computer device such as a terminal or a server alone, or it can be executed by a terminal and a server together. In the embodiment of the present application, the method can also be applied to a control system or a control terminal of a vacuum brazing furnace. The brazing heating control method includes the following steps S110 to S130. Among them:

[0035] Step S110, when the workpiece connected to the external power source is located in the vacuum brazing furnace, the external power source and the workpiece are controlled to be in a conducting state, and the vacuum brazing furnace is started to heat the workpiece.

[0036] In an exemplary embodiment, the workpiece includes a plate-fin heat exchanger, an upper plate disposed at one end of the plate-fin heat exchanger, and a lower plate disposed at the other end of the plate-fin heat exchanger. Specifically, in one embodiment, there is no load on the upper plate and the lower plate, and the upper plate and the lower plate are respectively in contact with the end surface of the plate-fin heat exchanger by gravity, a slight manufacturing tolerance or a preload; in an unloaded state, the relative displacement between the upper plate, the lower plate and the plate-fin heat exchanger is small or zero. In another embodiment, a certain load is applied to the upper plate and the lower plate by a press in a limiting manner, so that in a loaded state, the upper plate, the plate-fin heat exchanger, and the lower plate are pressed to form a workpiece. It should be noted that between the unloaded state and the loaded state, the displacement change of the upper plate relative to the plate-fin heat exchanger and the displacement change of the lower plate relative to the plate-fin heat exchanger are both 0.5 mm.

[0037] The external power supply is connected to the upper plate and the lower plate. Specifically, in one embodiment, the upper plate can be connected to the live wire of the external power supply, and the lower plate can be connected to the neutral wire of the external power supply. In other embodiments, the upper plate can also be connected to the neutral wire of the external power supply, and the lower plate 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 plate and the lower plate, in order to prevent the materials of the upper plate and the lower plate from contaminating the workpiece at high temperature, 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 is located between the plate-fin heat exchanger and the upper plate, and the second alloy sheet is located at the other end of the plate-fin heat exchanger and is located between the plate-fin heat exchanger and the lower plate. Specifically, Figure 2 As shown, a certain pressure is applied to the upper electrode plate 201 and the lower electrode plate 205 by a press machine, 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 tightly to form a workpiece.

[0039] In the embodiment of the present application, after the workpiece is connected to the external power supply, the workpiece needs to be placed in a vacuum with a degree of vacuum of 1.33×10 -2 to 1.33×10 -3 In the vacuum brazing furnace, the external power supply is controlled to be in a conductive state with the upper plate and the lower plate. In the conductive state, the external power supply is controlled to apply a certain voltage to the upper plate and the lower plate, so that the plate-fin heat exchanger can be heated by self-resistance to increase the core temperature of the plate-fin heat exchanger.

[0040] It should be noted that after placing the workpiece in the vacuum brazing furnace, the external power supply and the workpiece can be controlled to be in a conductive state to achieve self-resistance heating of the plate-fin heat exchanger. After heating for a period of time, the vacuum brazing furnace can be controlled to start to perform radiation heating on the plate-fin heat exchanger; the external power supply and the workpiece can also be controlled to be in a conductive state and the vacuum brazing furnace can be started at the same time to achieve self-resistance heating and radiation heating of the plate-fin heat exchanger.

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

[0042]

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

[0044] Furthermore, the material of the upper plate and the lower plate of the embodiment of the present application can be SiC, and the first alloy sheet and the second alloy sheet are titanium foil or titanium alloy sheet. When the external power supply and the workpiece are in a conductive state, the heat generation coefficient (h j )for:

[0045]

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

[0047] Combined with the above content, for example, the specifications and 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, the upper plate, and the lower plate are as shown in the figure below:

[0048]

[0049] Then, the heat generation coefficient (h i ) is 1.21×10 -7 ; The heat generation coefficient of the upper plate and the lower plate is (h j ) 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 degree in the vacuum brazing furnace needs to be maintained at 0.01 Pa in the embodiment of the present application.

[0051] By introducing the heat generation coefficient (h j ) limits the materials of the upper electrode plate and the lower electrode plate, so that the upper electrode plate and the lower electrode plate have a heat generation efficiency similar to that of the titanium alloy plate-fin heat exchanger, realize the synchronous heating of the upper electrode plate, the lower electrode plate and the titanium alloy plate-fin heat exchanger, reduce the excessive temperature difference of the titanium alloy plate-fin heat exchanger in the vertical direction due to the heat absorption of the upper electrode plate and the lower electrode plate, thereby improving the temperature uniformity of the titanium alloy plate-fin heat exchanger during the heating process.

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

[0053] In an example embodiment, the monitoring device may include a device for monitoring the surface temperature of the 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] In the process of heating the plate-fin heat exchanger in the vacuum brazing furnace, in order to ensure the heating effect and thus the brazing quality, it is necessary to use a monitoring device to monitor the surface temperature and heating time of the workpiece, so as to timely adjust the current of the external power supply and the output power of the vacuum brazing furnace. That is,

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

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

[0057] In the exemplary embodiment, the first preset time interval is [0, 120], that is, the first preset time interval is greater than or equal to 0S and less than or equal to 120S; 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 5 A / m 2 Less than or equal to 1.3×10 5 A / m 2 The first output power interval 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] It can be understood that, for example, after starting the vacuum brazing furnace, the current of the external power supply is linearly increased from 0S to 120S, so that the resistance heating current density on the upper plate and the lower plate is 1×10 5 A / m 2 to 1.3×10 5 A / m 2 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] Step S1202, when the heating time of the workpiece is within the second preset time 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 within the second output power interval.

[0060] In the example embodiment, the second preset time interval is [0, 200], that is, the second preset time interval is greater than or equal to 0S and less than or equal to 200S; the second output power interval 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] It can be understood that, for example, after the heating within 0S to 120S is completed, the output power of the vacuum brazing furnace is increased or linearly increased within 0S to 200S, so that the output power of the vacuum brazing furnace is between 20% and 60% of the rated output power. The current of the power supply of the external power supply remains unchanged, so that the resistance heating current density on the upper plate and the lower plate is still maintained at 1×10 5 A / m 2 to 1.3×10 5 A / m 2 between.

[0062] Step S1203, when the heating time of the workpiece is in the third preset time interval, adjust the current of the external power supply so that the current density of the upper plate and the lower plate is in the second current density interval, and control the heating power of the vacuum brazing furnace to be in the third output power interval.

[0063] In the exemplary embodiment, the third preset time interval is [0, 400], that is, the third preset time interval is greater than or equal to 0S and less than or equal to 400S; the second current density interval is [0, 1.0×10 3 ], that is, the second current density is greater than or equal to 0A / m 2 Less than or equal to 1.0×10 3 A / m 2 The third output power interval 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% of the rated output power of the vacuum brazing furnace and 85% of the rated output power of the vacuum brazing furnace.

[0064] It can be understood that after the heating within 0S to 200S is completed, the current of the external power supply is linearly reduced until it is turned off within 0S to 400S, so that the resistance heating current density on the upper plate and the lower plate is maintained at 0A / m 2 to 1.0×10 3 A / m 2 within; the output power of the vacuum brazing furnace is improved 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 surface temperature of the workpiece reaches the target temperature value, the external power supply and the upper and lower plates are turned off. Among them, the target temperature value range is greater than or equal to the brazing temperature -100°C and less than or equal to the brazing temperature -200°C. When the workpiece is heated within the above-mentioned different preset time intervals, the temperature is linearly increased or linearly decreased on the basis of the previous heating temperature. And, in an embodiment of the present application, the rated output power of the vacuum brazing furnace is 140kW. The maximum self-resistance heating power generated by the upper and lower plates is 30kW. In addition, in order to stabilize the heating power, the external power supply of the embodiment of the present application may adopt a DC power supply.

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

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

[0068] In an exemplary embodiment, the first preset time length is 130S; the first current is 10000A; and the first output power is 20kW.

[0069] It can be understood that, for example, the heating time is increased from 0S to 130S, the current of the external power supply is controlled to remain unchanged at 10000A, and the heating power of the vacuum brazing furnace is controlled to remain unchanged at 20kW.

[0070] Step S1220, when the workpiece heating time is greater than or equal to the first preset time and less than the second preset time, control the current of the external power supply to remain unchanged, and control the heating power of the vacuum brazing furnace to increase linearly from the first output power to the second output power.

[0071] In an exemplary embodiment, the second preset time length is 200S; and the second output power is 85kw.

[0072] It can be understood that, for example, the heating time increases from 130S to 200S, the current of the external power supply is controlled to remain unchanged at 10000A, and the heating power of the vacuum brazing furnace is controlled to become 50kW at 130S, and then increases linearly with the heating time, with an increase of 0.5kW / S until it increases to 85kw.

[0073] 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, control the current of the external power supply to linearly decrease to the second current and remain unchanged, 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.

[0074] In an exemplary embodiment, the third preset time length is 400S; the second current is 1000A; and the third output power is 130kw.

[0075] It can be understood that, for example, the heating time increases from 200S to 400S, and the current controlling the external power supply becomes 5200A at 200S, and then the current controlling the external power supply decreases linearly with the heating time, with a decrease of 20A / S, and remains unchanged after decreasing to 1000A; the heating power controlling the vacuum brazing furnace increases linearly with the heating time, with an increase of 0.5kW / S, and remains unchanged after increasing to 130kW.

[0076] Combining the above embodiments and Figure 3 , Figure 4 It is understandable that when the vacuum brazing furnace is started to heat, the temperature in the furnace is low, and the self-resistance heating of the workpiece will cause the workpiece to heat up quickly. At this time, the radiation heating of the vacuum brazing furnace mainly heats the furnace, which can effectively reduce the surface heat loss of the plate-fin heat exchanger. At this time, the maximum temperature difference between the core temperature and the surface temperature of the workpiece is ≤19°C. When entering the heating stage from 130S to 200S, the core temperature of the workpiece is higher than the surface temperature of the workpiece due to the rapid self-resistance heating of the workpiece. By increasing the radiation heating power of the vacuum brazing furnace, the surface temperature of the workpiece can be increased, and the temperature difference between the core temperature and the surface temperature of the workpiece can be reduced; at this time, the core temperature and the surface temperature of the workpiece are maintained at a low level, about 15°C. When entering the heating stage from 200S to 400S, the degree of increase in the radiant heating of the vacuum brazing furnace can no longer be compared with 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 reduce the self-resistance heating power of the workpiece; at this time, the heating rate of the workpiece is slightly lower than before, and the maximum temperature difference between the core temperature and the surface temperature of the workpiece is ≤24°C. In this way, the temperature difference between the surface and the core of the workpiece can be effectively reduced, and the heating efficiency of the workpiece can be improved.

[0077] In addition, in the range of 0S to 130S, the workpiece heating methods are self-resistance heating and low-power radiation heating; the range of 130S to 200S is the rapid temperature rise stage, and self-resistance heating and low-power radiation heating are used before the rapid temperature rise stage. This can 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, and improve the temperature uniformity of the plate-fin heat exchanger during rapid heating.

[0078] Furthermore, since the workpiece is heated by a heating method combining 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 of the workpiece, thereby significantly improving the heating efficiency of the workpiece.

[0079] Step S130, when the surface temperature of the workpiece reaches the target temperature value, the external power supply and the workpiece are controlled to be in a shut-off state and the vacuum brazing furnace is controlled 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 in an 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 keep the workpiece warm.

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

[0082] In combination with the above embodiments, it can be understood that, for example, when the external power supply and the workpiece are in a conductive state, the workpiece realizes self-resistance heating. When the heating time of the workpiece exceeds 400S 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 disconnected state. At this time, the workpiece no longer performs self-resistance heating; the vacuum brazing furnace is controlled to continue heating the workpiece, that is, radiation heating is performed 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, when the vacuum brazing furnace keeps the workpiece warm 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 by the furnace of the vacuum brazing furnace, or an inert gas can be filled into the vacuum brazing furnace to cool it down. For example, argon gas can be filled into the vacuum brazing furnace to achieve rapid cooling of the workpiece.

[0084] By implementing the above-mentioned steps S110 to S130, by connecting the upper electrode plate and the lower electrode plate provided on the plate-fin heat exchanger through an external power supply, self-resistance heating of the workpiece can be realized, and the core temperature of the plate-fin heat exchanger can be quickly increased; by heating the workpiece through a vacuum brazing furnace, radiation heating of the workpiece can be realized, and then the brazing of the plate-fin heat exchanger can be realized; by heating the workpiece in a heating method combining self-resistance heating and radiation heating, the temperature difference between the surface and the core of the workpiece can be effectively reduced, and the heating efficiency of the workpiece can be improved.

[0085] Based on the same inventive concept, the embodiment of the present application also provides a brazing heating control device for implementing the above-mentioned brazing heating control device. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above-mentioned method, so the specific limitations in one or more brazing heating control device embodiments provided below can refer to the limitations of the heating control method for the heat exchanger above, and will not be repeated here.

[0086] In an exemplary embodiment, Figure 5 As shown, a heating control device 500 for a heat exchanger is provided, comprising: 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 plate disposed at one end of the plate-fin heat exchanger, and a lower plate disposed at the other end of the plate-fin heat exchanger, and the external power supply is connected to the upper plate and the lower plate;

[0088] The second control module 520 is used to monitor the surface temperature and heating time of the workpiece by using a monitoring device when the vacuum brazing furnace heats the workpiece, 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;

[0089] The third control module 530 is used to control the external power supply and the workpiece to be in a shut-off state and 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 is the resistivity of titanium alloy, ρ i is the density of titanium alloy, C i is the specific heat capacity of titanium alloy, L1 is the fin thickness of titanium alloy plate-fin heat exchanger, and L2 is the fin spacing of 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 coefficient of the upper plate and the lower plate is:

[0094]

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

[0096] As an optional embodiment, the above-mentioned second control module 520 is also used to, when the heating time of the workpiece is in the first preset time interval, adjust the current of the external power supply so that the current density of the upper electrode plate and the lower electrode plate is in the first current density interval, and control the heating power of the vacuum brazing furnace to be in the first output power interval; when the heating time of the workpiece is in the second preset time interval, control the current of the external power supply to remain unchanged, and control the heating power of the vacuum brazing furnace to be in the second output power interval; when the heating time of the workpiece is in the third preset time interval, adjust the current of the external power supply so that the current density of the upper electrode plate and the lower electrode plate is in the second current density interval, and control the heating power of the vacuum brazing furnace to be in the third output power interval.

[0097] As an optional embodiment, the above-mentioned second control module 520 is also used to, when the heating time of the workpiece is less than the first preset time, control the current of the external power supply to be the first current, and control the heating power of the vacuum brazing furnace to be the first output power; when the heating time of the workpiece is greater than or equal to the first preset time and less than the second preset time, control the current of the external power supply to remain unchanged, and control the heating power of the vacuum brazing furnace to increase linearly from the first output power to the second output power; when the heating time of the workpiece is greater than or equal to the second preset time and less than the third preset time, control the current of the external power supply to linearly decrease to the second current and remain unchanged, 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 embodiment, the above-mentioned third control module 530 is also used to control the external power supply and the workpiece to be in an off state, and to control 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; when the surface temperature of the workpiece reaches the second target temperature value, control the vacuum brazing furnace to keep the workpiece warm.

[0099] In an exemplary embodiment, a computer device is provided. The computer device may be a server or a terminal. The internal structure diagram thereof may be as follows: Figure 6As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store video tag processing data. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a brazing heating control method is implemented.

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

[0101] In an exemplary embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0102] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0103] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[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, stored data, displayed data, 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 relevant data must comply with relevant regulations.

[0105] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present 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 may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0106] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0107] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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 article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A brazing heating control method, characterized in that: The brazing heating control method comprises: When a workpiece connected to an external power source is located in a vacuum brazing furnace, the external power source and the workpiece are controlled to be in a conducting state, and the vacuum brazing furnace is started to heat the workpiece; the workpiece includes a plate-fin heat exchanger, an upper electrode plate arranged at one end of the plate-fin heat exchanger, and a lower electrode plate arranged at the other end of the plate-fin heat exchanger, and the external power source is connected to the upper electrode plate and the lower electrode plate; 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, 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 the target temperature value, the external power supply and the workpiece are controlled to be in a shut-off state and the vacuum brazing furnace is controlled to be in a working state.

2. The brazing heating control method according to claim 1, characterized in that: When the external power supply and the workpiece are in a conducting state, the heat generation coefficient of the plate-fin heat exchanger is: Among them, R i is the resistivity of titanium alloy, ρ i is the density of titanium alloy, C i is the specific heat capacity of titanium alloy, L1 is the fin thickness of titanium alloy plate-fin heat exchanger, and L2 is the fin spacing of titanium alloy plate-fin heat exchanger.

3. The brazing heating control method according to claim 2, characterized in that: When the external power supply and the workpiece are in a conducting state, the heat generation coefficient of the upper plate and the lower plate is: Among them, R j is the resistivity of the plate material, ρ j is the plate material density, C j is the specific heat capacity of the plate material.

4. The brazing heating control method according to claim 3, characterized in that: When the surface temperature of the workpiece reaches a preset threshold value and / or the heating time of the workpiece reaches a preset time, adjusting the current of the external power supply and / or the heating power of the vacuum brazing furnace includes: When the heating time of the workpiece is within a first preset time interval, adjusting the current of the external power supply so that the current density of the upper electrode plate and the lower electrode plate is within a first current density interval, and controlling the heating power of the vacuum brazing furnace to be within a first output power interval; When the heating time of the workpiece is within the second preset time 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 within the second output power interval; When the heating time of the workpiece is within the third preset time interval, the current of the external power supply is adjusted so that the current density of the upper electrode plate and the lower electrode plate is within the second current density interval, and the heating power of the vacuum brazing furnace is controlled to be within the third output power interval.

5. The brazing heating control method according to claim 3, characterized in that: When the surface temperature of the workpiece reaches a preset threshold value and / or the heating time of the workpiece reaches a preset time, adjusting the current of the external power supply and / or the heating power of the vacuum brazing furnace includes: When the heating time of the workpiece is less than a first preset time, controlling the current of the external power supply to be a first current, and controlling the heating power of the vacuum brazing furnace to be a first output power; When the heating time of the workpiece 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 controlled to remain unchanged, and the heating power of the vacuum brazing furnace is controlled to increase linearly from the first output power to the second output power; 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 linearly decrease to the 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 the third output power and remain unchanged.

6. The brazing heating control method according to claim 5, characterized in that: When the surface temperature of the workpiece reaches the target temperature value, controlling the external power supply and the workpiece to be in a shut-off state and controlling the vacuum brazing furnace to be in a working state includes: 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 a first target temperature value, controlling the external power supply and the workpiece to be in a shutoff state, and controlling the vacuum brazing furnace to heat the workpiece; When the surface temperature of the workpiece reaches a second target temperature value, the vacuum brazing furnace is controlled to keep the workpiece warm.

7. A brazing heating control device, characterized in that: The brazing heating control device comprises: The first control module 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, and start the vacuum brazing furnace to heat the workpiece; the workpiece includes 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 to the upper plate and the lower plate; A second control module is used to monitor the surface temperature and heating time of the workpiece 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, adjust the current of the external power supply and / or the heating power of the vacuum brazing furnace; The third control module is used to control the external power supply and the workpiece to be in a shut-off state and control the vacuum brazing furnace to be in a working state when the surface temperature of the workpiece reaches a target temperature value.

8. A computer device comprising: 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 according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the brazing heating control method according to any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the brazing heating control method according to any one of claims 1 to 6 are implemented.

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