A lead-free induction soldering fixture for an oil-cooled heat exchanger

Abstract

This utility model discloses a lead-free induction soldering fixture for an oil-cooled heat exchanger, including a fixture support. A solder base is positioned at the upper center of the fixture support. A coil base is mounted on the outer side of the solder base. A coil frame is positioned on the inner side of the coil base. A lead-free induction coil is positioned on the coil frame. A coil connector is positioned on the outer side of the coil base. A connecting component is positioned at the end of the coil connector. A quick-connect matching groove is integrally formed on the upper outer ring of the solder base. A support base is positioned at the bottom of the fixture support. A positioning hole is positioned on the connecting component. The middle part of the lead-free induction coil is raised upwards. This utility model's lead-free induction soldering fixture for an oil-cooled heat exchanger, by replacing the solder with lead-free solder, can eliminate lead fumes during the soldering process, ensuring personnel health. The increased height of the coil's middle part allows for direct, single-pass soldering of the product.

Description

Technical Field

[0001] This utility model relates to the field of welding technology for oil-cooled heat exchangers, and in particular to a lead-free induction soldering fixture for oil-cooled heat exchangers. Background Technology

[0002] The core of an oil-cooled heat exchanger is a tubular core, which is assembled from nearly three hundred heat exchange tubes. Tin-lead alloy is typically used as the solder during welding, which produces lead fumes that are harmful to the environment and human health. The core of the oil-cooled heat exchanger consists of heat exchange tubes and tube sheets that are interlaced and welded together for sealing. A single core comprises nearly three hundred heat exchange tubes. During customer use, the heat exchange medium flows through multiple heat exchange tubes. Customers must ensure that every weld is leak-free, making welding the most critical process in oil-cooled heat exchangers. The main influencing factors in welding are the temperature of the product and the solder sheet, and the smooth flow of the solder molten metal. The induction coil is the primary factor controlling the temperature and flow of the product and solder sheet. The induction coil increases the product temperature through high-frequency induction, melting the solder sheet. The molten solder flows into the gaps between the heat exchange tubes and the tube sheet holes, filling the gaps through capillary action. Cooling water flows into the coil, accelerating the reduction of the coil and product temperature, thus speeding up the solidification of the solder molten metal and increasing production efficiency.

[0003] Existing soldering fixtures for oil-cooled heat exchangers have certain drawbacks. Conventional soldering methods, when used on products with many heat exchange tubes, result in uneven heating due to rapid temperature loss in the middle of the product, requiring two soldering operations to ensure overall soldering quality. Conventional soldering uses tin-lead alloy as solder, which generates lead fumes during the soldering process, posing a health hazard to operators and negatively impacting actual use. Therefore, we propose a lead-free induction soldering fixture for oil-cooled heat exchangers. Utility Model Content

[0004] Technical problem to be solved: In view of the shortcomings of the existing technology, this utility model provides a lead-free induction soldering fixture for oil-cooled heat exchangers. By replacing the solder with lead-free solder, no lead fumes are generated during the product soldering process, ensuring the health of personnel. After raising the height of the coil in the middle, the product can be directly soldered in a single operation, which can effectively solve the problems in the background technology.

[0005] Technical Solution: To achieve the above objectives, the technical solution adopted by this utility model is as follows: a lead-free induction soldering fixture for an oil-cooled heat exchanger, comprising a fixture support, a soldering base positioned at the upper center of the fixture support, a coil base mounted on the outer side of the soldering base, a coil frame positioned on the inner side of the coil base, a lead-free induction coil positioned on the coil frame, a coil connector positioned on the outer side of the coil base, a connecting component positioned at the end of the coil connector, a quick-connect matching groove integrally formed on the upper outer ring of the soldering base, a support base positioned at the bottom of the fixture support, a positioning hole positioned on the connecting component, and the middle of the lead-free induction coil raised upwards.

[0006] Preferably, a second hydraulic cylinder is connected to the bottom of the coil holder, and a second fine-tuning piston rod is provided on the second hydraulic cylinder. A first hydraulic cylinder is positioned at the center of the bottom of the solder holder, and a first fine-tuning piston rod is provided on the first hydraulic cylinder. A heat-resistant support is positioned at the upper end of the first fine-tuning piston rod, and a high heat-resistant coil assembly is positioned on the heat-resistant support. The high heat-resistant coil assembly is located at the center of the lead-free induction coil.

[0007] Preferably, the bottom of the tooling support is supported and fixed by a support base, and the coil base is installed on the outer wall of the solder base and can be adjusted up and down.

[0008] Preferably, the lead-free induction coil, coil frame, and coil connector are integrally formed, and the end of the coil connector is installed with a positioning hole through a connecting component.

[0009] Preferably, the upper end of the solder pad is matched with the shape of the oil-cooled heat exchanger via a quick-connect matching slot, and the center position of the lead-free induction coil is raised by 1.5-2mm.

[0010] Preferably, the first hydraulic cylinder controls the first fine-tuning piston rod to drive the heat-resistant support and the high heat-resistant coil assembly to rise and fall, the second hydraulic cylinder controls the second fine-tuning piston rod to drive the coil seat to rise and fall, and the first hydraulic cylinder and the second hydraulic cylinder control the lead-free induction coil to make fine adjustments up and down.

[0011] Beneficial effects: Compared with the prior art, this utility model provides a lead-free induction soldering fixture for oil-cooled heat exchangers, which has the following beneficial effects: This lead-free induction soldering fixture for oil-cooled heat exchangers, by replacing the solder with lead-free solder, can prevent the generation of lead fumes during the product soldering process, ensuring the health of personnel. After raising the height of the coil in the middle, the product can be directly soldered in a single operation. The entire lead-free induction soldering fixture for oil-cooled heat exchangers has a simple structure, is easy to operate, and has better performance than traditional methods. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of a lead-free induction soldering fixture for an oil-cooled heat exchanger according to this utility model.

[0013] Figure 2 This is a schematic diagram of the other side of the overall structure of the lead-free induction soldering fixture for an oil-cooled heat exchanger according to this utility model.

[0014] Figure 3 This is a schematic diagram of the induction coil in the lead-free induction soldering fixture of an oil-cooled heat exchanger according to this utility model.

[0015] Figure 4 This is a schematic diagram of the overall bottom structure of the lead-free induction soldering fixture for an oil-cooled heat exchanger according to this utility model.

[0016] Figure 5 This is a schematic diagram of the structure of the induction coil lifting and fine adjustment in the lead-free induction soldering fixture of an oil-cooled heat exchanger according to this utility model.

[0017] In the diagram: 1. Tooling support; 2. Support base; 3. Quick-connect matching slot; 4. Solder base; 5. Coil base; 6. Positioning hole; 7. Coil connector; 8. Connecting assembly; 9. Lead-free induction coil; 10. Coil frame; 11. High heat-resistant coil assembly; 12. Heat-proof support; 13. First hydraulic cylinder; 14. First fine-tuning piston rod; 15. Second hydraulic cylinder; 16. Second fine-tuning piston rod. Detailed Implementation

[0018] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. However, those skilled in the art will understand that the embodiments described below are only some embodiments of this utility model, not all embodiments, and are only used to illustrate this utility model, and should not be regarded as limiting the scope of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall be followed. Where the manufacturers of reagents or instruments are not specified, they are all conventional products that can be purchased commercially.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] like Figure 1-5 As shown, a lead-free induction soldering fixture for an oil-cooled heat exchanger includes a fixture support 1, a solder base 4 positioned at the upper center of the fixture support 1, a coil base 5 mounted on the outer side of the solder base 4, a coil frame 10 positioned on the inner side of the coil base 5, a lead-free induction coil 9 positioned on the coil frame 10, a coil connector 7 positioned on the outer side of the coil base 5, and a connecting component 8 positioned at the end of the coil connector 7. A quick-connect matching groove 3 is integrally formed on the upper outer ring of the solder base 4, a support base 2 is positioned at the bottom of the fixture support 1, and a positioning hole 6 is positioned on the connecting component 8. The middle of the lead-free induction coil 9 is raised upwards. By replacing the solder with lead-free solder, no lead fumes are generated during the product soldering process, ensuring the health of personnel. After the height of the middle of the coil is raised, the product can be directly soldered in a single operation.

[0022] Furthermore, a second hydraulic cylinder 15 is connected to the bottom of the coil base 5, and a second fine-tuning piston rod 16 is provided on the second hydraulic cylinder 15. A first hydraulic cylinder 13 is positioned at the center of the bottom of the solder base 4, and a first fine-tuning piston rod 14 is provided on the first hydraulic cylinder 13. A heat-resistant support 12 is positioned at the upper end of the first fine-tuning piston rod 14, and a high heat-resistant coil assembly 11 is positioned on the heat-resistant support 12. The high heat-resistant coil assembly 11 is located at the center of the lead-free induction coil 9.

[0023] Furthermore, the bottom of the tooling support 1 is supported and fixed by the support base 2, and the coil base 5 is installed on the outer wall of the solder base 4 and can be adjusted up and down.

[0024] Furthermore, the lead-free induction coil 9, coil frame 10 and coil connector 7 are integrally formed, and the end of the coil connector 7 is installed with the positioning hole 6 through the connecting component 8.

[0025] Furthermore, the upper end of the solder pad 4 is matched with the shape of the oil-cooled heat exchanger through the quick-connect matching slot 3, and the height of the center position of the lead-free induction coil 9 is increased by 1.5-2mm.

[0026] Furthermore, the first hydraulic cylinder 13 controls the first fine-tuning piston rod 14 to drive the heat-resistant support 12 and the high heat-resistant coil assembly 11 to rise and fall, and the second hydraulic cylinder 15 controls the second fine-tuning piston rod 16 to drive the coil seat 5 to rise and fall. The first hydraulic cylinder 13 and the second hydraulic cylinder 15 control the lead-free induction coil 9 to make fine adjustments up and down.

[0027] To address the issue of rapid temperature loss in the middle of the product, which necessitates secondary heating, the middle of the induction coil is raised by 1.5-2mm during manufacturing. This increases the heating speed in the middle, ensuring a consistent overall heating speed for the product and avoiding the need for secondary soldering.

[0028] For tin-lead alloy solder, replacing the solder with lead-free solder directly avoids the generation of toxic fumes from lead during the production process.

[0029] Maximum external dimensions: Length * Width * Height 455mm * 175mm * 95mm; The outer diameter of the copper tube for the coil is 6mm, the wall thickness is 1.5mm, the coil diameter is 155mm, and the number of coil turns is 6. The product takes 50 seconds to heat from room temperature to 240°C. The product cools from 240℃ to 100℃ in 60 seconds.

[0030] Working principle: This utility model includes a tooling support 1, a support base 2, a quick-connect matching slot 3, a solder base 4, a coil base 5, a positioning hole 6, a coil connector 7, a connecting assembly 8, a lead-free induction coil 9, a coil frame 10, a high heat-resistant coil assembly 11, a heat-resistant support 12, a first hydraulic cylinder 13, a first fine-tuning piston rod 14, a second hydraulic cylinder 15, and a second fine-tuning piston rod 16. By replacing the solder with lead-free solder, no lead fumes are generated during the product welding process, ensuring the health of personnel. After raising the height of the coil in the middle, the product can be directly welded in a single operation.

[0031] The diameter and number of turns of the copper tube in the induction coil Larger diameter copper tubing will be used in the coil to increase the cooling water flow rate during the cooling process and accelerate product cooling. The number of coil turns needs to be adjusted appropriately based on the rate of temperature rise and the maximum temperature.

[0032] Distance control of induction coil By protecting the coil with high-temperature cement and controlling the distance between the coil and the product, the heating speed and temperature are kept consistent each time.

[0033] Coil shape matching Based on the product's shape, custom-cast and cured high-temperature cement is used to ensure that the product's heating and welding positions correspond to the positions of the coil copper tubes.

[0034] Coil center height setting To ensure the quality of welding in the middle of the product, the height of the coil center position should be appropriately increased by 1.5-2mm, and the transition should be smooth.

[0035] It should be noted that, in this document, relational terms such as first and second (number one, number two), etc., are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A lead-free induction soldering fixture for an oil-cooled heat exchanger, comprising a fixture support (1), characterized in that: A soldering base (4) is positioned at the middle of the upper end of the tooling support (1). A coil base (5) is installed on the outer side of the soldering base (4). A coil frame (10) is positioned on the inner side of the coil base (5). A lead-free induction coil (9) is positioned on the coil frame (10). A coil connector (7) is positioned on the outer side of the coil base (5). A connecting component (8) is positioned at the end of the coil connector (7). A quick-connect matching groove (3) is integrally formed on the outer ring of the upper end of the soldering base (4). A support base (2) is positioned at the bottom of the tooling support (1). A positioning hole (6) is positioned on the connecting component (8). The middle of the lead-free induction coil (9) is raised upward.

2. The lead-free induction soldering fixture for an oil-cooled heat exchanger according to claim 1, characterized in that: The bottom of the coil base (5) is connected to a second oil cylinder (15), and a second fine-tuning piston rod (16) is provided on the second oil cylinder (15). A first oil cylinder (13) is positioned at the center of the bottom of the solder base (4). A first fine-tuning piston rod (14) is provided on the first oil cylinder (13). A heat-resistant support (12) is positioned at the upper end of the first fine-tuning piston rod (14). A high heat-resistant coil assembly (11) is positioned on the heat-resistant support (12). The high heat-resistant coil assembly (11) is located at the center of the lead-free induction coil (9).

3. The lead-free induction soldering fixture for an oil-cooled heat exchanger according to claim 1, characterized in that: The bottom of the tooling support (1) is supported and fixed by the support seat (2), and the coil seat (5) is installed on the outer wall of the solder seat (4) and can be adjusted up and down.

4. The lead-free induction soldering fixture for an oil-cooled heat exchanger according to claim 1, characterized in that: The lead-free induction coil (9), coil frame (10) and coil connector (7) are integrally formed, and the end of the coil connector (7) is installed with the positioning hole (6) through the connecting component (8).

5. The lead-free induction soldering fixture for an oil-cooled heat exchanger according to claim 1, characterized in that: The upper end of the solder pad (4) is matched with the shape of the oil-cooled heat exchanger through the quick-connect matching slot (3), and the center position height of the lead-free induction coil (9) is increased by 1.5-2mm.

6. The lead-free induction soldering fixture for an oil-cooled heat exchanger according to claim 2, characterized in that: The first oil cylinder (13) controls the first fine-tuning piston rod (14) to drive the heat-resistant support (12) and the high heat-resistant coil assembly (11) to adjust up and down. The second oil cylinder (15) controls the second fine-tuning piston rod (16) to drive the coil seat (5) to adjust up and down. The first oil cylinder (13) and the second oil cylinder (15) control the lead-free induction coil (9) to adjust up and down.

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