Heat exchange structure of oil pan of sewing machine and sewing machine

Abstract

The utility model relates to a heat exchange structure of an oil pan of a sewing machine and the sewing machine, and the heat exchange structure of the oil pan of the sewing machine comprises the oil pan used for containing a heat exchange medium; the heat pipe is provided with a cold side and a hot side which are opposite to each other, the hot side is located outside the oil pan, and the cold side extends into the oil pan; and the fan is linked with the main shaft of the sewing machine and acts on the hot side of the heat pipe. Heat in the oil pan of the sewing machine is conducted to the outside of the oil pan through the heat pipe, forced convection is achieved through the fan, and therefore high-power heat dissipation is achieved, the temperature of the whole machine is effectively reduced, the service life of the sewing machine is prolonged, and the use experience of operators is improved; meanwhile, the structure is simple, and production, transformation and upgrading are easy.

Description

Technical Field

[0001] This application relates to the field of sewing equipment technology, and in particular to a heat exchange structure for a sewing machine oil pan and a sewing machine. Background Technology

[0002] Sewing machines primarily join multiple layers of fabric together by stitching with thread. During operation, sewing machines generate a significant amount of heat, negatively impacting continuous production. This problem is particularly pronounced in industrial sewing machines with high-speed production processes.

[0003] Currently, the primary heat dissipation method in sewing machines is through an oil pan. This involves designing airflow channels and increasing the heat dissipation area within the oil pan to lower the temperature of the white oil inside. Simultaneously, the white oil flows throughout the sewing machine under the action of an oil pump, achieving overall cooling. Currently, oil pans are often made of pure aluminum, and the heat dissipation fins are generally cast integrally with the oil pan. This results in thick fins with a limited number, offering very limited additional heat dissipation area. Therefore, when facing a high-power heat source like a sewing machine, the pure aluminum heat dissipation structure cannot quickly conduct the heat from the white oil, failing to meet the needs of prolonged sewing machine use and indicating room for improvement. Utility Model Content

[0004] This application provides a heat exchange structure for a sewing machine oil pan, which has high heat dissipation efficiency, simple structure, is easy to manufacture, and can be used to upgrade existing equipment.

[0005] The heat exchange structure of a sewing machine oil pan in this application includes:

[0006] Oil pan, used to hold heat exchange medium;

[0007] A heat pipe having opposing cold and hot sides, wherein the hot side is located outside the oil pan and the cold side extends into the oil pan;

[0008] A fan is linked to the sewing machine spindle and acts on the hot side of the heat pipe.

[0009] Several alternative methods are provided below, but they are not intended as additional limitations on the overall solution above. They are merely further additions or optimizations. Provided there are no technical or logical contradictions, each alternative method can be combined individually with respect to the overall solution above, or multiple alternative methods can be combined with each other.

[0010] In one embodiment, the oil pan is equipped with an oil pump for conveying the heat exchange medium, and the cold side of the heat pipe is adjacent to the oil pump.

[0011] In one embodiment, there are at least two heat pipes, with the hot sides of each heat pipe arranged side by side, and heat exchange fins forming a heat dissipation section on the hot side of each heat pipe; the cold sides of each heat pipe have the same or different extension trends.

[0012] In one embodiment, there are at least three heat pipes, two of which extend further from both sides of the oil pump, and the cold side of the third extends toward the oil pump until its end is adjacent to the oil pump.

[0013] In one embodiment, the angle of the heat exchange fins is adapted to the airflow direction from the fan.

[0014] In one embodiment, the heat dissipation unit includes a cylindrical body extending through the airflow direction, an array of heat exchange fins disposed within the cylindrical body, and the hot side of the heat pipe penetrating through the cylindrical body and the heat exchange fins.

[0015] The heat exchange fins and the cylinder form a windward surface on the side facing the airflow delivered by the fan. The windward surface includes a first horizontal plane and a second inclined plane. The included angle between the first plane and the second plane is the windward angle A1, which is 45 degrees to 85 degrees.

[0016] In one embodiment, a single cylinder is provided with 20 to 80 heat exchange fins, each heat exchange fin having a thickness of 0.1 to 0.5 mm and a spacing of 0.1 to 0.5 mm between each heat exchange fin.

[0017] In one embodiment, the fan includes:

[0018] The impeller includes a base plate connected to the main shaft of the sewing machine and blades disposed on the base plate;

[0019] The airflow ring is cylindrical in shape and has an annular airflow channel inside. One axial end of the airflow ring is the airflow inlet, the middle of the airflow ring narrows inward, and the other axial end of the airflow ring has an outwardly expanding guide section.

[0020] A handwheel sleeve is provided over the airflow inlet, and the handwheel sleeve has an air hole that communicates with the airflow channel;

[0021] The base plate and the guide section are arranged axially at intervals, and the area between them is an airflow distribution zone. The blades are located in the airflow distribution zone and are distributed circumferentially at intervals. The airflow is radially dispersed outward after passing through the air hole, the airflow channel, and the airflow distribution zone axially.

[0022] In one embodiment, the fan provides radial airflow, and the heat exchange structure further includes:

[0023] A heat sink is arranged around the fan, partially enclosing the fan, and the heat exchange fins are located on the open side around the fan.

[0024] This application also discloses a sewing machine, including the heat exchange structure of the sewing machine oil pan as described in any one of the claims in this application.

[0025] This application uses heat pipes to transfer the heat of the heat exchange medium to the outside of the oil pan, and a fan to achieve forced convection, thereby achieving high-power heat dissipation, effectively reducing the temperature of the whole machine, increasing the service life of the sewing machine, and improving the user experience of the operator; at the same time, the structure is simple and easy to produce and upgrade. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of a sewing machine structure in one embodiment of this application;

[0028] Figure 2 for Figure 1 Exploded view of the internal structure of a medium-sized sewing machine casing;

[0029] Figure 3 for Figure 1 A top-down view of a sewing machine (oil pan omitted);

[0030] Figure 4 for Figure 3 A cross-sectional view of the sewing machine at point AA (oil pan omitted);

[0031] Figure 5 This is a schematic diagram of the heat dissipation section structure;

[0032] Figure 6 This is a schematic diagram of the heat exchange fins in plan view;

[0033] Figure 7 This is a schematic diagram of the heat exchange structure of the sewing machine oil pan in one embodiment of this application.

[0034] The component labels are as follows:

[0035] 100. Oil pan; 110. Oil pump; 120. Outer frame;

[0036] 210. First heat pipe; 220. Second heat pipe; 230. Third heat pipe; 240. Heat exchange fins; 250. Heat dissipation section; 251. Shell; 252. Airflow front; 253. First plane; 254. Second plane; 255. Airflow gap; 260. Heat dissipation plate;

[0037] 300. Fan; 310. Sewing machine spindle; 311. Motor; 320. Impeller; 330. Airflow ring; 340. Handwheel sleeve; 341. Air vent;

[0038] 400. Housing; 410. Air outlet. Detailed Implementation

[0039] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0040] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level (or in a usage state, or from a certain viewpoint in the drawing) than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level (or in a usage state, or from a certain viewpoint in the drawing) than the second feature.

[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0044] See appendix Figure 1 To be continued Figure 4 In the illustrated embodiment, this application discloses a heat exchange structure for a sewing machine oil pan, including an oil pan 100, heat pipes with cold and hot sides located inside and outside the oil pan 100 respectively, and a fan 300 acting on the hot side of the heat pipes. The fan 300 is linked to the sewing machine spindle 310. This application uses heat pipes to conduct heat from inside the sewing machine oil pan 100 to the outside of the oil pan 100, and the fan 300 achieves forced convection, thereby achieving high-power heat dissipation, effectively reducing the overall machine temperature, increasing the service life of the sewing machine, and improving the operator's user experience; at the same time, the structure is simple and easy to manufacture and upgrade.

[0045] In this embodiment, the cold side of the heat pipe is the heat absorption end, which exchanges heat with the heat exchange medium inside the oil pan 100, reducing the temperature of the heat exchange medium; the hot side of the heat pipe is the heat dissipation end, which exchanges heat with the airflow delivered by the fan 300 outside the oil pan 100. Multiple heat pipes can be provided to improve heat exchange efficiency. For example, in one embodiment, there are at least two heat pipes; another example is... Figure 3In the illustrated embodiment, there are three heat pipes: a first heat pipe 210, a second heat pipe 220, and a third heat pipe 230. In other embodiments, the number of heat pipes is three or more. The heat pipes in this application are not limited to those with an internal phase change medium; any component with thermal conductivity can be understood as a heat pipe, such as metal pipes, semiconductors, or delivery pipelines with a cold source. In the embodiments shown in the figures, the heat pipe itself can be made of copper or aluminum, and the internal phase change medium can be water, mercury, ammonia, etc. The internal core structure of the heat pipe can be of various types, such as sintered, grooved, or wire mesh. In one embodiment, the heat pipe is preferably a sintered pure copper heat pipe with methanol inside.

[0046] Besides increasing the number of heat pipes, heat exchange efficiency can also be improved by optimizing their extension paths. For example, the cold sides of each heat pipe can have the same or different extension trends. See the appendix for details. Figure 3 and attached Figure 7 In the illustrated embodiment, an oil pump 110 for conveying the heat exchange medium is provided within the oil pan 100. The cold side of the heat pipe is adjacent to the oil pump 110 to ensure that the temperature of the heat exchange medium drawn by the oil pump 110 meets the heat dissipation requirements. Furthermore, the first heat pipe 210 and the third heat pipe 230 extend further along both sides of the oil pump 110, and the cold side of the second heat pipe 220 extends towards the oil pump 110 until its end is adjacent to the oil pump 110. That is, at least two heat pipes surround the area where the oil pump 110 is located to improve the heat exchange effect. The first heat pipe 210 and the second heat pipe 220 extend in a straight line, while the third heat pipe 230 extends in a curved or zigzag pattern. This arrangement increases the thermal contact area while also providing favorable conditions for the hot-side layout of the heat pipes.

[0047] See appendix Figure 2 and attached Figure 3 In the illustrated embodiment, the heat pipes are arranged side-by-side on their hot sides, and each heat pipe has heat exchange fins 240 forming a heat dissipation section 250. This side-by-side arrangement of the hot sides allows for better centralized heat exchange using the airflow delivered by the fan 300, improving the overall appearance of the sewing machine. Furthermore, the heat dissipation section 250 can also be optimized for airflow heat exchange. See attached drawing. Figure 4 To be continued Figure 6 In the embodiment shown, the angle of the heat exchange fins 240 is adapted to the airflow direction from the fan 300. (See attached...) Figure 4The direction of airflow is indicated by arrows, showing that the airflow is not perpendicular to the heat dissipation unit 250. In this embodiment, the heat exchange fins 240 form a windward surface 252 on the side facing the airflow delivered to the fan 300, allowing for smoother airflow passage. Furthermore, the heat dissipation unit 250 includes a cylindrical body 251 extending through the airflow direction, with an array of heat exchange fins 240 arranged within the cylindrical body 251. The hot side of the heat pipe penetrates the cylindrical body 251 and each heat exchange fin 240. Thermal contact between the outer circumferential surface of the heat pipe and the cylindrical body 251, and between the heat exchange fins 240, can be achieved directly through a through-fin process, or the heat exchange efficiency can be further improved through a brazing process. The heat exchange fins 240 and the cylinder 251 form a windward surface 252 on the side facing the airflow delivered to the fan 300. The windward surface 252 includes a horizontally arranged first plane 253 and an inclined second plane 254. The included angle between the first plane 253 and the second plane 254 is the windward angle A1, which is between 45 degrees and 85 degrees. (See attached...) Figure 6 In this configuration, the angle of attack A1 ranges from 55 degrees to 80 degrees. The structure of the cylinder 251 provides an overall framework for the heat exchange fins 240 and facilitates heat exchange channels, while also increasing the specific heat capacity of the heat exchange fins 240. This means the cylinder 251 itself helps increase the thermal contact area with the airflow, improving the heat exchange effect. The angle of attack A1, combined with the side-by-side arrangement of the heat dissipation sections 250, forms an airflow gap 255 between them, allowing for smoother airflow into the gaps between the heat exchange fins 240. (See Appendix) Figure 5 In the embodiment shown, a single cylinder 251 is provided with 20 to 80 heat exchange fins 240, each heat exchange fin 240 having a thickness of 0.1 to 0.5 mm and a spacing of 0.1 to 0.5 mm between each heat exchange fin 240.

[0048] In addition to structural optimization of the heat sink 250 itself, the airflow utilization rate of the heat sink 250 can be improved through other components. See Appendix Figure 1 Appendix Figure 2 and appendix Figure 7 In the illustrated embodiment, a U-shaped outer frame 120 is provided on one side of the oil pan 100. The two ends of the opening of the outer frame 120 are connected to the side wall of the oil pan 100 to form a semi-enclosed space that is open at the top and bottom. The hot ends of each heat pipe converge inside the outer frame 120. Similarly, the airflow delivered by the fan 300 is aligned with the inside of the outer frame 120. The outer frame 120 can not only converge airflow to improve heat exchange efficiency, but also provide structural protection for the heat dissipation unit 250, preventing the heat exchange efficiency of the heat dissipation unit 250 from decreasing or being damaged due to external impacts in the production environment.

[0049] The fan 300 can also be optimized for heat exchange performance. See appendix. Figure 2 In the illustrated embodiment, the fan 300 includes:

[0050] Impeller 320 includes a base plate connected to sewing machine spindle 310 and blades disposed on the base plate;

[0051] The airflow ring 330 is cylindrical in shape and has an annular airflow channel inside. One end of the airflow ring 330 in the axial direction is the airflow inlet, the middle part of the airflow ring 330 in the axial direction narrows inward, and the other end of the airflow ring 330 in the axial direction has a guide section with an outwardly expanding shape.

[0052] The handwheel sleeve 340 is covered at the airflow inlet, and the handwheel sleeve 340 is provided with an air hole 341 that communicates with the airflow channel.

[0053] The base plate and the guide section are arranged axially at intervals, and the area between them is the airflow distribution area. The blades are located in the airflow distribution area and are distributed circumferentially at intervals. The airflow is radially dispersed outward after passing through the air hole 341, the airflow channel, and the airflow distribution area along the axial direction.

[0054] The fan 300 can be directly driven by the motor 311 of the sewing machine spindle 310, or it can have a separate power source. Except for the handwheel sleeve 340, the fan 300 is enclosed by the housing 400, which provides a relatively enclosed cavity to improve airflow. The bottom of the housing 400 has an air outlet 410 aligned with the hot side of the heat pipe, and the airflow delivered by the impeller 320 is transported to the hot side of the heat pipe through the air outlet 410. See Appendix. Figure 4 In the illustrated embodiment, the fan 300 provides radial airflow, and the heat exchange structure further includes a heat sink 260. The heat sink 260 is arranged circumferentially around the fan 300, partially enclosing it. The heat exchange fins 240 are located on the open side of the fan 300's circumference. The semi-enclosed heat sink 260 improves the airflow efficiency of the fan 300, and can also be thermally coupled to the sewing machine frame or other heat sources to provide auxiliary heat dissipation.

[0055] Combining the above and the appendix Figure 1 As illustrated in the embodiments, this application also discloses a sewing machine including a heat exchange structure for the sewing machine oil pan according to any embodiment of this application. The specific heat exchange structure of the sewing machine oil pan can be found in the description above. Other configurations of the sewing machine can be implemented in conjunction with existing technology, and will not be elaborated further here.

[0056] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification. When technical features of different embodiments are embodied in the same drawing, it can be regarded as the drawing also disclosing examples of combinations of the various embodiments involved.

[0057] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A heat exchange structure for a sewing machine oil pan, characterized in that, include: Oil pan, used to hold heat exchange medium; A heat pipe having opposing cold and hot sides, wherein the hot side is located outside the oil pan and the cold side extends into the oil pan; A fan is linked to the sewing machine spindle and acts on the hot side of the heat pipe.

2. The heat exchange structure of the sewing machine oil pan according to claim 1, characterized in that, The oil pan is equipped with an oil pump for conveying the heat exchange medium, and the cold side of the heat pipe is adjacent to the oil pump.

3. The heat exchange structure of the sewing machine oil pan according to claim 2, characterized in that, The heat pipes are at least two, with their hot sides arranged side by side, and each heat pipe has heat exchange fins on its hot side to form a heat dissipation section; the cold sides of each heat pipe have the same or different extension trends.

4. The heat exchange structure of the sewing machine oil pan according to claim 3, characterized in that, The heat pipes are at least three in number, with two extending further from both sides of the oil pump, and the cold side of the third extending toward the oil pump until its end is adjacent to the oil pump.

5. The heat exchange structure of the sewing machine oil pan according to claim 3, characterized in that, The angle of the heat exchange fins is adapted to the airflow direction from the fan.

6. The heat exchange structure of the sewing machine oil pan according to claim 5, characterized in that, The heat dissipation unit includes a cylindrical body that extends through the airflow direction, and an array of heat exchange fins is disposed inside the cylindrical body. The hot side of the heat pipe passes through the cylindrical body and the heat exchange fins. The heat exchange fins and the cylinder form a windward surface on the side facing the airflow delivered by the fan. The windward surface includes a first horizontal plane and a second inclined plane. The included angle between the first plane and the second plane is the windward angle A1, which is 45 degrees to 85 degrees.

7. The heat exchange structure of the sewing machine oil pan according to claim 5, characterized in that, Each cylinder contains 20 to 80 heat exchange fins, each fin having a thickness of 0.1 to 0.5 mm and a spacing of 0.1 to 0.5 mm between them.

8. The heat exchange structure of the sewing machine oil pan according to claim 1, characterized in that, The fan includes: The impeller includes a base plate connected to the main shaft of the sewing machine and blades disposed on the base plate; The airflow ring is cylindrical in shape and has an annular airflow channel inside. One axial end of the airflow ring is the airflow inlet, the middle of the airflow ring narrows inward, and the other axial end of the airflow ring has an outwardly expanding guide section. A handwheel sleeve is provided over the airflow inlet, and the handwheel sleeve has an air hole that communicates with the airflow channel; The base plate and the guide section are arranged axially at intervals, and the area between them is an airflow distribution zone. The blades are located in the airflow distribution zone and are distributed circumferentially at intervals. The airflow is radially dispersed outward after passing through the air hole, the airflow channel, and the airflow distribution zone axially.

9. The heat exchange structure of the sewing machine oil pan according to claim 3, characterized in that, The fan provides radial airflow, and the heat exchange structure further includes: A heat sink is arranged around the fan, partially enclosing the fan, and the heat exchange fins are located on the open side around the fan.

10. A sewing machine, characterized in that, The heat exchange structure includes the sewing machine oil pan according to any one of claims 1 to 9.

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