A heat sink, a heating element, and an electric heater

Abstract

The present invention discloses a heat sink, a heating element and a heater. The heat sink includes: an oil pocket, including an upper oil pocket formed at the top of the heat sink and a lower oil pocket at the bottom; a plurality of heat conduction oil paths communicating the upper oil pocket and the lower oil pocket; a plurality of baffles disposed on the flow path of the heat conduction oil in the lower oil pocket; the baffles are disposed in at least part of the lower oil pocket. With such a setting, the running path of the heat conduction oil can be lengthened, the heat dissipation area can be increased, thereby improving the heat dissipation capacity of the oil path. The disturbance of the heat conduction oil in the heat conduction oil path is strengthened, so that natural convection heat transfer can be carried out between the heat conduction oil paths, and the ability of natural convection heat transfer of the air outside the heater is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and particularly relates to a heat sink, a heating element, and an electric heater. Background Art

[0002] As a commonly used household appliance for winter heating in families, the working principle of an electric heater is to use an electric heating rod to heat the heat-conducting oil in an oil bag at the bottom of the heat sink main body, and then the high-temperature heat-conducting oil enters the oil bag at the top of the heat sink main body through a heat-conducting oil path. The heat-conducting oil between adjacent heat sinks is connected through the oil bag. During the process of flowing through the heat-conducting oil path, the heat-conducting oil heats the heat sink main body, and then transfers heat to the surrounding ambient air to achieve the purpose of heating for users.

[0003] During the working process of the electric heater, the temperature distribution around the electric heater is determined by the oil path structure. The current oil path structure of the electric heater is relatively regular and symmetrical. The temperature of the heat-conducting oil at each position and the heat dissipation capacity of the oil path housing are the same, and there is no convective heat transfer between the heat-conducting oil paths, resulting in poor natural convective heat transfer conditions. Because during heating, the flow field law of the heat-conducting oil inside the current electric heater is usually: after the heat-conducting oil at the bottom of the electric heater is heated by the heating rod, its density decreases, and compared with other low-temperature oils, it will flow upward along the oil path. Since the middle oil path is wider, most of the heated heat-conducting oil will flow upward along the middle oil path and directly flow to the upper oil bag, and at the same time flow downward through the oil paths on both sides. The hot fluid is concentrated in the upper part of the electric heater, and the cold fluid is concentrated in the lower part of the electric heater, resulting in the problem that the upper part of the electric heater has a higher temperature and the lower part has a lower temperature. Another main reason for this problem is that: the temperature change of the heat-conducting oil in the oil path is basically within 20°C. However, when the air dissipates heat from the electric heater housing, the air is heated, its density becomes smaller, and it gradually rises. During the rising process, the air temperature gradually increases, and the heat dissipation effect on the electric heater housing weakens, and the housing temperature shows a high upper and low lower. Therefore, during long-term use, after testing, the temperature difference between the upper and lower parts of the electric heater is as high as 40°C, and the uniformity of the surface temperature distribution of the heat sink is extremely poor.

[0004] Considering the safety of user use, the electric heater is provided with a temperature control system to adjust the electric heating output power so that the temperature of the touchable edge is within a safe range and does not cause dangers such as scalding. However, due to the extremely large temperature difference between the upper and lower parts of the electric heater, local points in the upper part of the electric heater are extremely likely to reach the set temperature. When the set temperature is reached, the temperature control element of the electric heater works, resulting in the reduction of the full-power output time of the electric heater and poor continuous heating ability, and poor user comfort. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem of large temperature difference between the upper and lower parts of the heat sink of the existing electric heater and uneven temperature of the electric heater, so as to provide a heat sink, a heating element, and an electric heater.

[0006] To solve the above technical problems, the present invention provides a heat sink, which includes: an oil pocket, including an upper oil pocket formed at the top of the heat sink and a lower oil pocket at the bottom; a plurality of heat conduction oil paths connecting the upper oil pocket and the lower oil pocket; a plurality of baffles arranged on the flow path of the heat conduction oil in the lower oil pocket; the baffles are arranged in at least part of the lower oil pocket.

[0007] Optionally, the heat conduction oil path includes a side oil path and a central oil path. At least two side oil paths are arranged on both sides of the central oil path. Oil ports are respectively arranged on the side oil path and the central oil path, and the baffle is arranged close to the oil port of the central oil path.

[0008] Optionally, the inner diameter of the central oil path is larger than the inner diameter of the side oil path.

[0009] Optionally, there are two side oil paths. The horizontal distance between the two side oil paths is W1, and the horizontal length of the baffle is W2. W2 is greater than 0.3W1 and less than 0.8W1.

[0010] Optionally, along the height direction, the oil port of the central oil path is arranged above the baffle, and the baffle is arranged above the oil port of the side oil path.

[0011] Optionally, the baffle is planar. The vertical distance between the baffle and the central oil path is H1, and H1 ≤ 1.5W2.

[0012] Optionally, when the baffle is arched and protrudes towards the oil port of the central oil path, the included angle between the tangents at both ends of the baffle and the horizontal direction is greater than or equal to 20°.

[0013] Optionally, when the baffle is arched and protrudes away from the oil port of the central oil path.

[0014] Optionally, the baffle includes a first baffle symmetrically arranged relative to the central oil path and a pair of second baffles; the first baffle on one side of the central oil path is arranged higher than the second baffle, and the distance between the first baffle and the heating rod is greater than the distance between the second baffle and the heating rod.

[0015] Optionally, the heating element further includes: an auxiliary oil path adapted to connect the central oil path and at least one of the side oil paths.

[0016] Optionally, the baffles are alternately arranged in multiple heat sinks.

[0017] The present invention also provides a heating element, which includes: the heat sink according to any one of the above, and a plurality of the heat sinks are arranged side by side; a heating rod which is simultaneously inserted through the lower oil pocket positions of each of the heat sinks; the baffle includes a first baffle and a second baffle symmetrically arranged with respect to the central oil path, and the distance between the first baffle and the heating rod is greater than the distance between the second baffle and the heating rod.

[0018] The present invention also provides an electric heater, which includes: the heating element according to any one of the above; a temperature control element arranged on the heating element; an indicator light arranged on the heating element and electrically connected to the temperature control element; an auxiliary device arranged on the heating element.

[0019] The technical solution of the present invention has the following advantages:

[0020] 1. The present invention provides a heat sink, which includes: an oil pocket including an upper oil pocket formed at the top of the heat sink and a lower oil pocket at the bottom; a plurality of heat conduction oil paths connecting the upper oil pocket and the lower oil pocket; a plurality of baffles arranged on the flow path of the heat conduction oil in the lower oil pocket; the baffles are arranged in at least part of the lower oil pocket.

[0021] With such an arrangement, when the oil in the lower oil pocket is heated and flows upward, since the baffle is arranged on the flow path of the heat conduction oil, the heat conduction oil will not directly be transmitted to the upper oil pocket through the heat conduction oil path, which plays a buffering role for the heat conduction oil and forms a backflow near the baffle, which is beneficial to increasing the heat dissipation amount at the lower part of the heat sink, while reducing the heat dissipation load at the upper part of the heat sink, and avoiding the temperature of the upper part of the heat sink being too high due to insufficient heat dissipation capacity at the upper part of the heat sink. While increasing the heat dissipation capacity of the electric heater, the structure of the heat conduction oil path is significantly simplified and the processing difficulty is reduced.

[0022] 2. By making the inner diameter of the central oil path larger than that of the side oil paths, the present invention can increase the surface area of the oil path, thereby increasing the heat dissipation amount of the electric heater. Due to the presence of the baffle, the heat conduction oil is heated and rises along the first oil path and the second oil path on both sides. After reaching the upper oil pocket, the relatively cold heat conduction oil quickly moves downward to the lower oil pocket under the action of gravity to supplement the lower oil pocket. As the electric heater continues to work, a stable natural convection path is formed in the oil path. The heat dissipation conditions of the upper oil pocket and the lower oil pocket are improved, making the temperatures of all parts of the electric heater uniform. It is beneficial to increasing the heat dissipation amount at the lower part of the heat sink, while reducing the heat dissipation load at the upper part of the heat sink, and avoiding the temperature of the upper part of the heat sink being too high due to insufficient heat dissipation capacity at the upper part of the heat sink.

[0023] 3. In the present invention, when W2 is greater than 0.3W1 and less than 0.8W1, when the heat-conducting oil heats up and rises, the baffle can completely block the heat-conducting oil from entering the central oil path, thereby preventing some of the hot oil from bypassing the baffle and continuing to rise along the central oil path, improving the heating effect of the electric heater, thus improving the heat dissipation of the upper oil pocket and the lower oil pocket, and making the temperatures of all parts of the electric heater uniform.

[0024] 4. In the present invention, by setting the baffle to be planar or arched and arranging the baffle horizontally along the radial direction of the heating rod, the buffering effect on the heat-conducting oil can be further enhanced, and a reflux is formed near the baffle, enabling the heat-conducting oil to circulate in the lower oil pocket, reducing the flow rate of the heat-conducting oil entering the upper oil pocket, and improving the non-uniformity of the surface temperature of the heat sink. At the same time, it is beneficial to increase the heat dissipation of the lower part of the heat sink, while reducing the heat dissipation load of the upper part of the heat sink, and avoiding the over-high temperature of the upper part of the heat sink caused by insufficient heat dissipation capacity of the upper part of the heat sink.

[0025] 5. In the present invention, by making H1 less than or equal to 1.5W2, the heating effect of the electric heater can be further improved, thus improving the heat dissipation of the upper oil pocket and the lower oil pocket, and making the temperatures of all parts of the electric heater uniform.

[0026] 6. In the present invention, by protruding the baffle towards the oil port direction close to the central oil path, on the one hand, it ensures that the heat-conducting oil can enter and rise from both side oil paths; on the other hand, after the cold oil descending in the central oil path moves along the baffle, it can collide and mix with the hot oil to enter the two side oil channels, effectively improving the uniformity of the temperature of the lower oil pocket.

[0027] 7. In the present invention, by making the included angle between the tangents at both ends of the baffle and the horizontal direction greater than or equal to 20°, the collision effect can be further enhanced, thereby effectively improving the uniformity of the temperature of the lower oil pocket.

[0028] 8. In the present invention, by adding the first baffle and the second baffle, when the oil body in the lower oil pocket is heated and the heated heat-conducting oil flows upward along the heating rod, the heat-conducting oil near the lower oil pocket is dispersed to the outer shell as much as possible, thereby increasing the temperature outside the lower oil pocket, reducing the temperature difference of the heat-conducting oil in the lower oil pocket, and effectively improving the uniformity of the temperature of the lower oil pocket.

[0029] 9. In the present invention, by alternately arranging the baffles in a plurality of heat sinks, the temperature between the heat sinks can be adjusted, and the problems of over-high temperature rise outside the heat sink and too low internal temperature between the heat sinks of the electric heater can be avoided. Description of the Drawings

[0030] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 Structural schematic diagram of the first embodiment of the embodiment of the present invention;

[0032] Figure 2 Distance schematic diagram of the first embodiment of the embodiment of the present invention;

[0033] Figure 3 Front view of the second embodiment of the embodiment of the present invention;

[0034] Figure 4 Front view of the third embodiment of the embodiment of the present invention;

[0035] Figure 5 Top view of the electric heater of the embodiment of the present invention.

[0036] Explanation of reference numerals:

[0037] 1 - heat sink; 2 - upper oil bag; 3 - lower oil bag; 4 - first oil circuit; 5 - second oil circuit; 6 - central oil circuit; 7 - auxiliary oil circuit; 8 - baffle; 9 - heating rod. Specific embodiments

[0038] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the drawings. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] Embodiment 1

[0043] In the prior art, due to the close arrangement of the heat sinks 1, the spacing between the heat sinks is small, the air flow resistance is large, the amount of air passing through the spacing between the heat sinks per unit time is relatively small, and the heat on the heat sinks 1 cannot be taken away in time, thus affecting the convective heat transfer.

[0044] As Figures 1 to 5 shown, an embodiment of the present invention provides a heat sink, which includes: an oil pocket, a plurality of heat conduction oil paths, and a plurality of baffles 8. The arrow direction is the flow direction of the heat conduction oil.

[0045] The oil pocket includes an upper oil pocket 2 formed at the top of the heat sink 1 and a lower oil pocket 3 at the bottom of the heat sink 1. The upper oil pocket 2 and the lower oil pocket 3 are used to store the heat conduction oil. The heat sink 1 is assembled by two left and right metal sheets. The oil paths and oil pockets are formed by stamping on the left and right metal sheets. The through cavity formed after assembly is the heat conduction oil path, the upper oil pocket 2, and the lower oil pocket 3. The heat conduction oil path connects the upper oil pocket 2 and the lower oil pocket 3, so that the heated heat conduction oil forms a convection between the upper oil pocket 2 and the lower oil pocket 3. A heating rod 9 is also installed inside the lower oil pocket 3 to heat the heat conduction oil. The baffle 8 is arranged on the flow path of the heat conduction oil in the lower oil pocket 3 to block the heated heat conduction oil or the heat conduction oil entering the lower oil pocket 3, playing a certain buffering and disturbing role. The baffle 8 is fixedly connected by welding the left and right sides of the lower oil pocket 3.

[0046] The baffle 8 is at least partially disposed in the lower oil pocket 3. In this way, after changing the flow direction of the heat transfer oil in the lower oil pocket 3, the heat transfer oil can be more evenly mixed, and the situation of local overcooling will not occur. When the oil in the lower oil pocket 3 is heated and flows upward, since the baffle 8 is disposed on the flow path of the heat transfer oil and the inlet of the central oil path 6 is blocked, the heated heat transfer oil will flow upward from the heat transfer oil paths on both sides, and the central oil path 6 will flow downward. Fluids always flow to places with less resistance. Therefore, the heat transfer oil will not directly be transmitted to the upper oil pocket 2 through the heat transfer oil path, which plays a buffering role for the heat transfer oil and forms a reflux near the baffle 8, which is beneficial to increasing the heat dissipation amount at the lower part of the heat sink 1, while reducing the heat dissipation load at the upper part of the heat sink 1 and avoiding the temperature at the upper part of the heat sink 1 being too high due to insufficient heat dissipation capacity at the upper part of the heat sink 1. While increasing the heat dissipation capacity of the electric heater, the structure of the heat transfer oil path is significantly simplified and the processing difficulty is reduced.

[0047] In this embodiment, the baffle 8 is made of a metal material, such as an iron sheet, etc., and it can be installed at the inner wall position of the lower oil pocket by welding. The baffle 8 can also be a glass sheet, a quartz sheet, etc. At this time, steps can be provided on the inner wall of the lower oil pocket to install the baffle 8.

[0048] After the electric heater is powered on, the heat transfer oil in the lower oil pocket 3 is heated by the heating element. When the heat transfer oil is heated, its volume will expand, and the coefficient of thermal expansion is approximately α = 7.5×10 －4 K －1 , therefore, as the temperature rises, the density of the heat transfer oil decreases. Under the action of the density difference, the heated heat transfer oil moves upward. A baffle 8 is provided at the inlet of the middle oil path in the lower oil pocket 3. When the oil in the lower oil pocket 3 is heated and flows upward, it first flows upward through the oil paths on both sides, converges in the upper oil pocket 2, and then returns to the lower oil pocket 3 through the central oil path 6 in the upper oil pocket 2 for continuous heating. The unheated heat transfer oil or the heat transfer oil with a lower temperature moves downward to the lower oil pocket 3 under the action of gravity to supplement the lower oil pocket 3. As the electric heater continues to work, a stable natural convection path is formed in the oil path. The heat of the hot oil is transferred to the surface of the heat sink 1 through the heat conduction of the metal and convectively exchanges heat with the air between the heat sink 1 to achieve the effect of heating the space. For consumers, when the lower part of the electric heater is hotter, it is easy to feel the heat on the feet, and the overall comfort is better.

[0049] The heat transfer oil path includes a side oil path and a central oil path 6. There are at least two side oil paths disposed on both sides of the central oil path. In this embodiment, the side oil path includes a first oil path 4 and a second oil path 5, and the first oil path 4 and the second oil path 5 are disposed on both sides of the central oil path 6. The inner diameter of the central oil path 6 is larger than the inner diameters of the first oil path 4 and the second oil path 5.

[0050] With such a setting, the surface area of the oil circuit is increased, thereby increasing the heat dissipation of the electric heater. Due to the presence of the baffle 8, the heat-conducting oil rises along the first oil circuit 4 and the second oil circuit 5 on both sides after being heated. After reaching the upper oil pocket 2, the relatively cold heat-conducting oil moves rapidly downward to the lower oil pocket 3 under the action of gravity to supplement the lower oil pocket 3. As the electric heater continues to work, a stable natural convection path is formed in the oil circuit. The heat dissipation conditions of the upper oil pocket 2 and the lower oil pocket 3 are improved, making the temperatures of all parts of the electric heater uniform. It is beneficial to increase the heat dissipation of the lower part of the heat sink 1, while reducing the heat dissipation load of the upper part of the heat sink 1, and avoiding the over-high temperature of the upper part of the heat sink 1 due to insufficient heat dissipation capacity of the upper part of the heat sink 1.

[0051] In this embodiment, the cross-section of the heat-conducting oil circuit can be a regular shape such as a circle, an ellipse, a rectangle, etc., or an irregular shape, as long as it can achieve the diversion of the oil.

[0052] Of course, the number of the side oil circuits is not limited. In this embodiment, it is only an example. Those skilled in the art can change the number of the side oil circuits according to the actual situation as long as the corresponding technical effects can be achieved.

[0053] On the basis of the above embodiment, as an alternative embodiment, the baffle 8 is arranged in a planar shape, or as Figure 3 or Figure 4 shown, is arranged in an arched shape, and the baffle 8 can be horizontally arranged along the radial direction of the heating rod 9, so that the contact area between the baffle 8 and the flowing heat-conducting oil is the largest.

[0054] In this way, the buffering effect on the heat-conducting oil can be further enhanced, and a backflow is formed near the baffle 8, so that the heat-conducting oil circulates in the lower oil pocket 3, reducing the flow rate of the heat-conducting oil entering the upper oil pocket 2 and improving the non-uniformity of the surface temperature of the heat sink 1. At the same time, it is beneficial to increase the heat dissipation of the lower part of the heat sink 1, while reducing the heat dissipation load of the upper part of the heat sink 1, and avoiding the over-high temperature of the upper part of the heat sink 1 due to insufficient heat dissipation capacity of the upper part of the heat sink 1.

[0055] As Figure 2 shown, on the basis of the above embodiment, as an alternative embodiment, along the width direction of the heat sink 1, the distance between the first oil circuit 4 and the second oil circuit 5 is W1, and the width of the baffle 8 is W2, where W2 is greater than 0.3W1 and less than 0.8W1. When W2 < 0.3W1, part of the heat-conducting oil will bypass the baffle 8 and continue to rise along the central oil circuit 6, affecting the drainage effect.

[0056] With such a setting, when the heat-conducting oil heats up and rises, the baffle 8 can completely block the heat-conducting oil from entering the central oil path 6, thereby preventing some of the hot oil from bypassing the baffle 8 and continuing to rise along the central oil path 6, improving the heating effect of the electric heater, thus improving the heat dissipation of the upper oil bag 2 and the lower oil bag 3, and making the temperature of each part of the electric heater uniform.

[0057] As Figure 1 shown, along the height direction, the oil port of the central oil path is arranged above the baffle, and the baffle is arranged above the oil port of the side oil path. As Figure 2 shown, when the baffle 8 is planar, the vertical distance between the baffle 8 and the entrance of the central oil path 6 is H1, and the vertical distances from the two sides of the baffle 8 to the entrances of the oil paths are H2. And the baffle 8 is arranged between the oil port of the central oil path 6 in the lower oil bag 3 and the heating rod 9. When H1 or H2 is greater than 0, it means that the baffle 8 is below the oil path entrance; when H1 or H2 is less than 0, it means that the baffle 8 is above the oil path entrance.

[0058] To further improve the heating effect of the electric heater, H1 ≤ 1.5W2 and H2 > 0 should be satisfied. In this way, the heat dissipation of the upper oil bag 2 and the lower oil bag 3 can be improved, and the temperature of each part of the electric heater can be made uniform.

[0059] When the ambient temperature is 23 ± 2 °C and the power of the electric heater is 200 W, a temperature measurement point is arranged above, on the left side and below the lower oil bag 3 of the electric heater. The distance from each temperature measurement point to the center of the lower oil bag 3 is 25 mm. The test conditions of each temperature point are as follows:

[0060]

[0061] It can be seen from the above table that the temperature of the upper part of the electric heater decreases significantly, the temperature of the lower part increases significantly, and the maximum temperature difference at the edges is greatly reduced. It indeed improves the heat dissipation of the upper oil bag 2 and the lower oil bag 3, and the temperature of each part of the electric heater is relatively uniform.

[0062] As Figure 3 shown, when the baffle 8 is arched and convexly arranged towards the direction close to the entrance of the central oil path, the vertical distance between the center of the baffle 8 and the entrance of the middle oil path is H3, and the vertical distances from both ends of the baffle 8 to the entrances of the two side oil paths are H4. At this time, H4 should be greater than -2 cm, that is, both ends of the baffle 8 are arranged inside the first oil path 4 and the second oil path 5, and are 2 cm away from the oil ports of the first oil path 4 and the second oil path 5. There is no special requirement for H3. On the one hand, it ensures that the heat-conducting oil can enter from both side oil paths and rise; on the other hand, after the cold oil descending in the central oil path 6 moves along the baffle 8, it can collide and mix with the hot oil to enter the two side oil channels, effectively improving the temperature uniformity of the lower oil bag 3.

[0063] The angles between the tangents at both ends of the baffle 8 and the horizontal direction are greater than or equal to 20°. In this way, the impact effect can be further improved, thereby effectively improving the temperature uniformity of the lower oil pocket 3.

[0064] As Figure 4 shown, when the baffle 8 is arched and the concave surface faces upward, the vertical distance from the center of the baffle 8 to the inlet of the middle oil path is H3, and the vertical distances from both ends of the baffle 8 to the inlets of the oil paths on both sides are H4. At this time, it should satisfy H4>0, that is, both ends of the baffle 8 are arranged between the oil ports of the heat-conducting oil path and the heating rod 9, and there is no requirement for H3.

[0065] Although the baffle 8 can be of different shapes, the degree of turbulent flow of the heat-conducting oil formed in the lower oil pocket 3 is different, but all can enhance the mixing uniformity of the heat-conducting oil in the lower oil pocket 3.

[0066] In each of the above embodiments, by adding a baffle 8 above the heating rod 9 in the lower oil pocket 3, the baffle 8 can cover the left and right sides of the heating rod 9. In this way, the relatively hot heat-conducting oil near the lower oil pocket 3 can be dispersed to the two sides of the edge of the lower oil pocket 3 as much as possible, reducing the radial temperature difference of the heat-conducting oil in the lower oil pocket 3. The radial temperature difference refers to the temperature distribution in the direction extending outward with the heating rod 9 as the center. At different radial distances, the temperature is also different. That is, the closer to the center of the heating rod 9, the higher the temperature; the farther to the outside, the lower the temperature.

[0067] Before the baffle 8 was added, after the heat-conducting oil in the lower oil pocket 3 was heated, the hot fluid flowed upward along the outer wall of the heating rod 9 in a laminar flow form. Along the radial direction of the heating rod 9, only the fluid close to the heating tube had a higher temperature, and the temperature of the outer side was lower, and the overall temperature gradient was large. After adding the baffle 8, the heat-conducting oil in the lower oil pocket 3 is heated. When the heat-conducting oil climbs along the heating rod 9 and encounters the baffle 8, it flows outward, thereby increasing the temperature on the outer side of the lower oil pocket 3.

[0068] Specifically, the flow conditions of the fluid are divided into laminar flow and turbulent flow. When the Reynolds number of the fluid is lower than 2000 (or the flow velocity is lower), its flow condition can be considered laminar flow; when the Reynolds number is higher than 2000, its flow condition is considered turbulent flow.

[0069] On the basis of the above embodiments, as an optional embodiment, the baffle can also be a first baffle and a second baffle symmetrically arranged relative to the central oil path. The first baffle on one side of the central oil path is arranged higher than the second baffle, and the distance between the first baffle and the heating rod is greater than the distance between the second baffle and the heating rod.

[0070] After the heat transfer oil in the lower oil pocket 3 is heated, the heated heat transfer oil flows upward along the heating rod 9. By arranging the first baffle and the second baffle, the heat transfer oil near the lower oil pocket 3 is dispersed to the outer casing as much as possible, thereby increasing the temperature outside the lower oil pocket 3, reducing the temperature difference of the heat transfer oil in the lower oil pocket 3, and effectively improving the temperature uniformity of the lower oil pocket 3.

[0071] On the basis of the above embodiments, as a preferred implementation manner, the heat sink 1 further includes: an auxiliary oil path 7, which is adapted to connect the central oil path and at least one side oil path.

[0072] The auxiliary oil path 7 can be used to adjust the circulation volume of the heat transfer oil in each part of the heat transfer oil path, strengthen heat transfer at positions with good heat dissipation conditions, improve the heat dissipation of positions with poor heat dissipation conditions, and make the temperatures of all parts of the electric heater uniform. Of course, in order to further increase the operation path of the heat transfer oil, the auxiliary oil path 7 can be arranged in an arch shape or a wave shape. It can also be arranged in other shape structures as long as it can increase the operation path of the heat transfer oil. In this embodiment, only examples are given and not limited. Those skilled in the art can make changes according to the actual situation.

[0073] By arranging the auxiliary oil path 7, the surface area of the oil path is increased, thereby increasing the heat dissipation of the electric heater and avoiding the problem that the temperature of the upper part of the heat sink 1 is too high due to insufficient heat dissipation capacity of the upper part of the heat sink 1. As the electric heater continues to work, a stable natural convection path is formed in the oil path. Improve the heat dissipation of the upper oil pocket 2 and the lower oil pocket 3, and make the temperatures of all parts of the electric heater uniform.

[0074] As an alternative implementation manner, as Figure 5 shown, the baffles 8 are alternately arranged in a plurality of heat sinks 1. By alternately arranging the baffles 8 in a plurality of heat sinks 1, the temperature between the heat sinks 1 can be adjusted, and the problems of too high temperature rise on the outside of the heat sinks 1 and too low internal temperature between the heat sinks 1 can be avoided.

[0075] Embodiment 2

[0076] The embodiment of the present invention further provides a heating element, which includes:

[0077] The heat sink according to any one of the above, and a plurality of the heat sinks are arranged side by side with each other;

[0078] A heating rod 9, which is simultaneously inserted through the lower oil pocket positions of each of the heat sinks.

[0079] As a preferred implementation manner, the baffle includes a first baffle and a second baffle symmetrically arranged relative to the central oil path, and the distance between the first baffle and the heating rod is greater than the distance between the second baffle and the heating rod.

[0080] Embodiment 3

[0081] An embodiment of the present invention further provides an electric heater, which includes the above-mentioned heating element, temperature control element and indicator light. The temperature control element and the indicator light are both arranged on the heating element, and the indicator light is electrically connected to the temperature control element.

[0082] Moreover, an auxiliary device is also arranged on the heating element. The auxiliary device can be a fan. Since the air between the heat sinks 1 is in a natural convection state, the hot air rises upward along the heat sinks 1, is discharged into the space upward at the top of the heater body, and the cold air is supplemented from the bottom of the heat sinks 1. By arranging a fan, the natural convection intensity of the air outside the electric heater can be enhanced, the speed of the hot air discharged upward along the heat sinks 1 into the space can be accelerated, the air fluidity between the heat sinks 1 is strengthened, the temperature difference between the upper and lower parts of the electric heater is reduced, and the user experience is improved.

[0083] The auxiliary device can also be but is not limited to: a clothes hanger, arranged above the heating element, suitable for drying clothes and the like; it can also be a mobile bracket, arranged at the bottom of the heating element, used to support the heating element or drive the heating element to move. The mobile bracket itself can be a folding structure or an integrally formed structure. When the folding structure is adopted, it is convenient to reduce the space occupation amount during idle time and improve the storage efficiency of the electric heater.

[0084] Obviously, the above embodiments are only examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A heat sink, characterized in that, Comprising: An oil pocket, including an upper oil pocket (2) formed on the top of the heat sink (1) and a lower oil pocket (3) at the bottom; A plurality of heat conduction oil paths, connecting the upper oil pocket (2) and the lower oil pocket (3); A plurality of baffles (8), arranged on the flow path of the heat conduction oil in the lower oil pocket (3); the baffle (8) is arranged in at least part of the lower oil pocket (3); The heat conduction oil path includes a side oil path and a central oil path (6), at least two side oil paths are arranged on both sides of the central oil path (6), oil ports are respectively arranged on the side oil path and the central oil path (6), the baffle (8) is arranged near the oil port of the central oil path (6) to block the entrance of the central oil path (6); The inner diameter of the central oil path (6) is larger than that of the side oil path; There are two side oil paths, the horizontal distance between the two side oil paths is W1, the horizontal length of the baffle (8) is W2, and W2 is greater than 0.3W1 and less than 0.8W1; In the height direction, the oil port of the central oil path (6) is arranged above the baffle (8), and the baffle (8) is arranged above the oil port of the side oil path; The baffle (8) is used to change the flow direction of the heat conduction oil in the lower oil pocket (3); When the oil in the lower oil pocket (3) is heated and flows upward, the entrance of the central oil path (6) is blocked, the heated heat conduction oil flows upward from the side oil paths on both sides, and the central oil path (6) flows downward. The baffle (8) buffers the heat conduction oil and forms a backflow near the baffle (8).

2. The heat sink according to claim 1, wherein The baffle (8) is planar, and the vertical distance between the baffle (8) and the central oil path (6) is H1, and H1 ≤ 1.5W2.

3. The heat sink according to claim 2, characterized in that, When the baffle (8) is arched and protrudes towards the oil port direction close to the central oil path (6), the included angle between the tangents at both ends of the baffle (8) and the horizontal direction is greater than or equal to 20°.

4. The heat sink according to claim 2, characterized in that, When the baffle (8) is arched and protrudes away from the oil port direction of the central oil path (6).

5. The heat sink according to claim 2, wherein, The baffle (8) includes a first baffle and a second baffle symmetrically arranged relative to the central oil path (6); the first baffle on one side of the central oil path (6) is arranged higher than the second baffle.

6. The heat sink according to any one of claims 1-5, characterized in that, Further comprising: An auxiliary oil path (7), adapted to connect the central oil path (6) with at least one side oil path.

7. The heat sink according to any one of claims 1 to 5, characterized in that, The baffle (8) is alternately arranged in a plurality of heat sinks (1).

8. A heating element, characterized in that, Comprising: The heat sink (1) according to any one of claims 1 - 7, a plurality of the heat sinks (1) are arranged side by side; A heating rod (9), simultaneously passing through the position of the lower oil pocket (3) of each heat sink (1).

9. The heating element according to claim 8, wherein The baffle (8) includes a first baffle and a second baffle symmetrically arranged relative to the central oil path (6), and the distance between the first baffle and the heating rod (9) is greater than the distance between the second baffle and the heating rod (9).

10. An electric heater, characterized in that, Comprising: The heating element according to claim 8 or 9; A temperature control element, arranged on the heating element; An indicator light, arranged on the heating element and electrically connected to the temperature control element.

11. The electric heater according to claim 10, characterized in that, Further comprising an auxiliary device, arranged on the heating element.

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