Impurity removal treatment method for refrigerant runner plate

Abstract

The invention relates to the technical field of automobile part machining, in particular to a refrigerant runner plate impurity removal treatment method, a high-pressure water cleaning scheme is used after die casting machining, the cleanliness of machined parts is guaranteed by cleaning valve holes at fixed points and cleaning welding faces through linear interpolation, and a reciprocating cleaning scheme is used after die casting machining and stamping parts. Firstly, a workpiece is soaked in a high-temperature cleaning solution, then ultrasonic cleaning, spray cleaning, spray cleaning, compressed air wind shearing, compressed air wind shearing, vacuum drying and cold air cooling are conducted in sequence, a dustproof structure is arranged on a brazing tool, and the situation that foreign matter of the workpiece in a tunnel furnace drifts into a refrigerant runner plate, and the refrigerant runner plate is polluted is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts processing, in particular to a method for removing impurities from a refrigerant flow channel plate. Background Art

[0002] The refrigerant flow channel plate is an important part of the thermal management integrated module of new energy vehicles. The refrigerant flow channel plate needs to be installed with electronic expansion valves, solenoid valves, one-way valves, temperature sensors, pressure sensors and other components. The main functions of the electronic expansion valve are to adjust the flow rate and throttle and reduce the pressure. The flow rate is mainly adjusted by the electronic expansion valve combined with the degree of superheat of the refrigerant to determine the opening of the valve, thereby effectively adjusting the amount of refrigerant entering the heat exchanger, so that the refrigerant inside the pipeline and the heat load inside the heat exchanger can match. The throttling and pressure reduction is mainly to convert the high-pressure refrigerant liquid at room temperature into a low-temperature and low-pressure liquid. At the same time, a small amount of flash gas will be generated, which is reduced by A low-pressure method is used to achieve the performance of absorbing heat from the outside world, so that the absorbed indoor heat can be accurately determined to meet the use requirements of air conditioning. If the foreign matter in the refrigerant flow plate is out of tolerance, the foreign matter can enter the electronic expansion valve through the following ways, causing the valve to get stuck: the foreign matter enters the electronic expansion valve through the gap between the valve seat and the connecting seat; it enters the valve stem assembly upward along the gap between the cavity guide sleeve assembly and the connecting seat and reaches the threaded pair, causing the electronic expansion valve to get stuck; the foreign matter enters from the gap between the valve seat and the connecting seat, along the inner cavity of the valve seat, and reaches the threaded pair at the valve needle matching structure inside the valve stem assembly, causing a jam; the foreign matter enters from the valve port, and enters the threaded pair upward along the movement trajectory of the valve stem assembly, causing a jam. Therefore, the refrigerant flow plate serves as the mounting support of the electronic expansion valve and as the pipeline of the heat pump system. It is a core and key component of the heat pump system, and the cleanliness control of its sub-components is extremely important; the refrigerant flow plate used in the thermal management integrated module of new energy vehicles adopts a gas shielded brazing welding process, and the product structure of the refrigerant flow plate is mainly composed of a refrigerant flow plate main plate, a refrigerant flow plate sub-plate, a refrigerant joint and a welding gasket; among them, the refrigerant flow plate is an aluminum alloy die-casting, and the welding surface and the refrigerant valve mounting hole are formed by machining, and the cleanliness of the parts after machining is poor; the refrigerant flow plate sub-plate and the welding gasket are stamped parts, and the cleanliness after stamping is also poor.

[0003] Combined with the product characteristics of the electronic expansion valve itself, the cleanliness requirements for the refrigerant flow plate are as follows: metal particle size ≤ 0.5mm, non-metallic particle size ≤ 0.5mm, fiber particle size ≤ 2.5mm. According to the existing cleanliness control plan, the cleanliness of the refrigerant flow plate after welding is tested. The cleanliness test results are as follows. The metal particles, non-metallic particles and fiber particles do not meet the requirements. It is urgent to study a cleanliness control plan to control the cleanliness of the product. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a refrigerant flow channel plate impurity removal method capable of fully removing impurities from the refrigerant flow channel plate after welding.

[0005] The present invention is realized by the following technical solutions: a method including impurity removal of refrigerant flow channel plate main board and impurity removal of welding, Among them, the refrigerant flow channel mainboard impurity removal includes the following steps: Step 1: high temperature soaking, the soaking temperature is 75-85℃, and the soaking time is 1.5-2h; Step 2: ultrasonic cleaning, control the temperature at 40-50°C, and the cleaning time is 1-1.5 minutes; Step 3: Continuous spray flushing, the flushing water temperature is 40-50℃, and the flushing time is 40-50s; Step 4: Cut at room temperature with air, the cutting time is 40-60 seconds, and the air pressure is 4-6 bar; Step 5: high temperature cutting, wind cutting time is 20-25s, wind pressure is 0.2bar, and wind cutting temperature is 60-90℃; Step six, vacuum drying; Step seven, cooling with cold air; Step 8: Inspection and storage.

[0006] Furthermore, in step one, the soaking liquid is clean water, and the soaking liquid is driven to flow by a circulation pump.

[0007] Furthermore, in step 2, the ultrasonic frequency is 40KHz.

[0008] Furthermore, in step three, continuous spray flushing is performed at at least three workstations, and the flushing positions of two adjacent workstations are different.

[0009] Furthermore, in step 4, the wind cutting is performed at at least three workstations, and the wind cutting positions of two adjacent workstations are different.

[0010] Furthermore, the refrigerant flow channel plate that has been cut by high-temperature wind enters the vacuum drying equipment within 3 seconds. During the vacuum drying process, the refrigerant flow channel plate is in a high-temperature state.

[0011] Furthermore, the welding impurity removal includes a sealing welding process and a reciprocating cleaning impurity removal process.

[0012] The beneficial effects of the present invention are: 1. High-temperature soaking can effectively remove the mold release agent residue in the casting process. Ultrasonic cleaning can remove the residual small particles on the surface and attached to the flow channel holes. Continuous spray cleaning can flush away large particles that cannot be removed by soaking and ultrasonic cleaning. High-temperature wind shearing can quickly remove the residual moisture in the spray cleaning. Vacuum drying can quickly remove the residual moisture in the flow channel holes and gaps, thereby achieving the purpose of removing the residual debris on the refrigerant flow channel plate and mainboard. 2. Set up a support assembly and a pressing assembly, and use the pressing assembly to press the refrigerant flow channel plate onto the support assembly, and then accurately fix it to ensure welding stability. At the same time, prevent debris from entering the refrigerant flow channel plate during the welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the refrigerant flow channel plate in the first direction; Figure 2 This is a schematic diagram of the second direction structure of the refrigerant flow channel plate.

[0014] Figure 3 This is a schematic diagram of the brazing welding fixture structure for the refrigerant flow channel plate; Figure 4 This is a schematic diagram of the second direction of the brazing welding fixture for the refrigerant flow channel plate; Figure 5 for Figure 4 A partial enlarged schematic diagram in the middle; Figure 6 This is a schematic diagram of the matching relationship between the press-fit column and the refrigerant flow channel plate; Figure 7 This is a schematic diagram of the coordination between the support column and the refrigerant channel plate; Figure 8 Schematic diagram of the pressed column structure.

[0015] in: 1. Refrigerant flow channel main board; 101. Chiller inlet; 102. Chiller outlet; 105. Expansion valve port I; 106. Pressure sensor port; 107. Large-diameter expansion valve port; 108. External exchange inlet; 109. SOV port I; 110. SOV port II; 111. Gas distributor port; 112. Expansion valve port II; 113. Check valve port; 114. Temperature sensor port; 115. External exchange outlet; 2. Refrigerant flow channel plate sub-plate; 201. Internal cooling outlet; 202. Evaporator inlet; 203. Evaporator outlet; 3. Refrigerant joint; 4. Welding gasket; 5. Pressing frame; 6. Reinforcement rib; 7. Pressing column; 8. Support frame; 9. Connecting rod; 10. Support column; 11. Connecting shaft; 12. Guide structure; 13. Horizontal pressure plate; 14. Guide rod; 15. Guide sleeve; 16. Floating rod; 17. Buffer spring; 18. Pressing sleeve; 19. Pressure head; 20. Connecting column; 21. Welding dust cover; 22. Exhaust hole; 23. Top plate; 24. Welding bottom plate. DETAILED DESCRIPTION

[0016] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0018] In the following embodiments, the refrigerant flow channel plate includes a refrigerant flow channel main plate 1, a refrigerant flow channel sub-plate 2, a refrigerant joint 3 and a welding gasket 4, wherein the outer side of the refrigerant flow channel main plate 1 is sequentially processed with a chiller inlet 101, a chiller outlet 102, an expansion valve interface I 105, a pressure sensor interface 106, a large-diameter expansion valve interface 107, an external exchange inlet 108, a SOV interface I 109, a SOV interface II 110, and a gas separation interface 111, and the inner side of the refrigerant flow channel main plate 1 is sequentially processed with an expansion valve interface II 112, a one-way valve interface 113, a temperature sensor interface 114, and an external exchange outlet 115, and the refrigerant flow channel sub-plate is connected to the refrigerant joint and the welding gasket.

[0019] The refrigerant flow channel plate main plate 1 and the refrigerant flow channel plate sub-plate 2 are brazed to form a refrigerant channel. The refrigerant joint 3 is welded to the refrigerant flow channel plate sub-plate through a welding gasket 4 and connected to the refrigerant channel. The refrigerant flow channel plate sub-plate 2 has an internal cooling outlet 201, an evaporator inlet 202, and an evaporator outlet 203.

[0020] Example 1 like Figure 1-shown, a refrigerant flow channel plate impurity removal method, including refrigerant flow channel plate main board impurity removal, welding impurity removal, wherein the refrigerant flow channel plate main board impurity removal includes the following steps: Step 1: high temperature soaking, the soaking temperature is 75-85℃, and the soaking time is 1.5-2h; Step 2: ultrasonic cleaning, control the temperature at 40-50°C, and the cleaning time is 1-1.5 minutes; Step 3: Continuous spray flushing, the flushing water temperature is 40-50℃, and the flushing time is 40-50s; Step 4: Cut at room temperature with air, the cutting time is 40-60 seconds, and the air pressure is 4-6 bar; Step 5: high temperature cutting, wind cutting time is 20-25s, wind pressure is 0.2bar, and wind cutting temperature is 60-90℃; Step six, vacuum drying; Step seven, cooling with cold air; Step 8: Inspection and storage.

[0021] High-temperature immersion can effectively remove the release agent residue in the casting process, ultrasonic cleaning can remove the residual small particles of debris on the surface and attached to the flow channel holes, continuous spray cleaning can flush away large particles of debris that cannot be removed by immersion and ultrasonic cleaning, high-temperature wind shearing can quickly remove the residual moisture in the spray cleaning, and vacuum drying can quickly remove the residual moisture in the flow channel holes and gaps, thereby achieving the purpose of removing the residual debris on the refrigerant flow channel plate mainboard.

[0022] Welding impurity removal includes sealing welding process and reciprocating cleaning impurity removal process. The sealing welding process is carried out on the refrigerant flow channel plate brazing welding tool, which is used for brazing the refrigerant flow channel plate.

[0023] The refrigerant flow channel plate brazing welding tooling includes a support assembly, and the support assembly includes a support frame 8. In this embodiment, the support frame 8 is made of aluminum alloy plate, has high structural strength and is light in weight. The support frame 8 is also connected with reinforcing ribs 6, thereby improving the anti-deformation strength. There is a support platform at the upper end of the support frame 8. Specifically, the support platform includes multiple upward support columns 10, and the upper ends of the multiple support columns 10 are supported by a welding base plate 24 through a horizontal top plate 23. The upper end surface of the welding base plate 24 cooperates with the refrigerant flow channel plate, and the welding base plate 24 is shaped like the refrigerant flow channel plate sub-plate 2. During the brazing welding process, the welding base plate 24 is fitted with the refrigerant flow channel plate sub-plate 2, and the welding base plate 24 is processed with through holes, which can accelerate heat dissipation.

[0024] The refrigerant flow channel plate brazing welding tool also includes a pressing assembly, which includes a pressing frame 5. The pressing frame 5 is also made of aluminum alloy plate, has high structural strength and is light in weight. The pressing frame 5 is also connected with reinforcing ribs 6 to improve the deformation resistance. A pressing column 7 that matches the support platform is installed on the pressing frame 5. Specifically, the pressing column 7 is an elastic pressing column 7. The elastic pressing column 7 includes a floating rod 16. The floating rod 16 passes through the pressing frame 5 upward. A guide hole that matches the floating rod 16 is machined on the pressing frame 5. A buffer spring 17 is installed between the floating rod 16 and the pressing frame 5. The lower end of the floating rod 16 is connected to a pressure head 19 that matches the refrigerant flow channel plate. The pressure head 19 is disc-shaped, thereby increasing the pressure with the main body of the refrigerant flow channel plate. The fitting area of the plate 1, part of the pressure head 19 cooperates with the interface of the refrigerant flow channel plate main board 1. In order to accelerate the discharge of hot air during brazing, the floating rod 16 is made of a pipe fitting to form an exhaust cavity. The pressure head 19 is processed with an exhaust hole 22 connected to the exhaust cavity. The floating rod 16 between the pressing frame 5 and the buffer spring 17 is also provided with a pressing sleeve 18 to support the buffer spring 17. A welding dust cover 21 is also installed on the pressing frame 5. The welding dust cover 21 cooperates with the interface of another part of the refrigerant flow channel plate main board 1. The head of the welding dust cover 21 is connected to the pressing frame 5 through the connecting column 20. The welding dust cover 21 slides with the connecting column 20, so that the welding dust cover 21 can be lifted and lowered along the connecting column 20 to avoid interference.

[0025] A pre-tightening structure is installed between the support frame 8 and the pressing frame 5. The pre-tightening structure includes a connecting rod 9. The lower end of the connecting rod 9 is hinged to the support frame 8. The upper end of the connecting rod 9 is integrally formed with a transverse pressure plate 13 that cooperates with the pressing frame 5. A transverse connecting shaft 11 is installed on the pressing frame 5. The lower end surface of the transverse pressure plate 13 is processed with an arc groove that cooperates with the connecting shaft 11. When the support frame 8 and the pressing frame 5 are connected through the pre-tightening structure, the buffer spring 17 is in a compressed state, thereby realizing pre-tightening between the support assembly, the refrigerant flow channel plate, and the pressing assembly.

[0026] A guide structure 12 is further installed between the support frame 8 and the pressing frame 5 . The guide structure 12 includes a guide rod 14 installed on the pressing frame 5 , and a guide sleeve 15 matched with the guide rod 14 is installed on the support frame 8 .

[0027] During use, first pre-install the support assembly and the pressing assembly, then invert the pressing assembly, and then sequentially place the refrigerant flow channel plate main board 1 on the pressing assembly, place the refrigerant flow channel plate sub-plate 2 on the refrigerant flow channel plate main board 1, and place the welding piece on the refrigerant joint 3 to form a refrigerant joint 3 assembly, place the refrigerant joint 3 assembly on the refrigerant flow channel plate sub-plate 2, and place the welding base plate 24 on the refrigerant flow channel plate assembly, and then connect the support assembly to the pressing assembly, pre-tighten it through the pre-tightening structure, adjust the positioning during the placement process, and then accurately fix it to ensure the welding stability, and then place the refrigerant flow channel plate brazing tooling on the press workbench, and use the press to further bring the support assembly and the pressing assembly closer, so that the refrigerant flow channel plate main board 1, the refrigerant flow channel plate sub-plate 2, the refrigerant joint 3 and the welding gasket 4 are further compressed, and the brazing operation begins.

[0028] After brazing, vibration, rotation, blowing and suction are used to carry out preliminary impurity removal.

[0029] The reciprocating flushing and impurity removal process includes the following steps, see Appendix 1.

[0030] Schedule 1

[0031] In the process of reciprocating flushing and impurity removal, the water inlet pipe is connected at the inlet, the drain pipe is connected at the outlet, and the other interfaces are blocked. Then the refrigerant flow channel plate after welding is divided into 11 channels and you choose which one to remove impurities, effectively cleaning dead corner impurities and improving cleaning efficiency.

[0032] The impurity removal treatment method for the refrigerant flow channel plate provided in this embodiment, the test results of the refrigerant flow channel plate that has not been treated with impurities are shown in Appendix 2. Schedule 2

[0033] The test results of the refrigerant flow plate after impurity removal are shown in Appendix 3. Schedule 3

[0034] The cleanliness of the refrigerant flow channel plate that has undergone impurity removal treatment meets the standard requirements of metal particles ≤0.5mm, non-metallic particles ≤0.5mm, and fiber particles ≤2.5mm, and the overall impurity removal cycle is short.

[0035] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for removing impurities from a refrigerant channel plate, characterized in that: Including the removal of impurities from the refrigerant flow plate mainboard and welding, Among them, the refrigerant flow channel mainboard impurity removal includes the following steps: Step 1: high temperature soaking, the soaking temperature is 75-85℃, and the soaking time is 1.5-2h; Step 2: ultrasonic cleaning, control the temperature at 40-50°C, and the cleaning time is 1-1.5 minutes; Step 3: Continuous spray flushing, the flushing water temperature is 40-50℃, and the flushing time is 40-50s; Step 4: Cut at room temperature with air, the cutting time is 40-60 seconds, and the air pressure is 4-6 bar; Step 5: high temperature cutting, wind cutting time is 20-25s, wind pressure is 0.2bar, and wind cutting temperature is 60-90℃; Step six, vacuum drying; Step seven, cooling with cold air; Step 8: Inspection and storage.

2. The refrigerant channel plate impurity removal method according to claim 1, characterized in that: In step 1, the soaking liquid is clean water, and the soaking liquid is driven to flow by a circulation pump.

3. The refrigerant channel plate impurity removal method according to claim 1, characterized in that: In step 2, the ultrasonic frequency is 40KHz.

4. The refrigerant channel plate impurity removal method according to claim 1, characterized in that: In step three, continuous spray flushing is performed at at least three workstations, and the flushing positions of two adjacent workstations are different.

5. The refrigerant channel plate impurity removal method according to claim 1, characterized in that: In step 4, the wind cutting is performed at at least three workstations, and the wind cutting positions of two adjacent workstations are different.

6. The refrigerant channel plate impurity removal method according to claim 1, characterized in that: The refrigerant flow channel plate that has been cut by high-temperature wind enters the vacuum drying equipment within 3 seconds. During the vacuum drying process, the refrigerant flow channel plate is in a high-temperature state.

7. The refrigerant channel plate impurity removal method according to claim 1, characterized in that: The welding impurity removal process includes a sealing welding process and a reciprocating cleaning impurity removal process.

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