Heat sink and oil heater

Abstract

The present invention relates to a heat sink and an electric oil heater, comprising a main body, an upper oil chamber arranged in the upper section of the main body, a lower oil chamber arranged in the lower section of the main body, and an oil circuit comprising a first main circuit, a first branch circuit, a second main circuit, a second branch circuit, a third main circuit, a third branch circuit, and a fourth main circuit. The sum of the average flow cross-sectional areas of the plurality of third branches is greater than the sum of the average flow cross-sectional areas of the plurality of first branches, and is less than the sum of the average flow cross-sectional areas of the plurality of second branches. The sum of the volumes of the fourth main circuit and all the third branches is greater than the sum of the volumes of the first main circuit and all the first branches, and is less than the sum of the volumes of the second main circuit, the third main circuit, and all the second branches. It can improve the problem of uneven heating of the heat sink and the electric oil heater, which can not only improve the heating effect of the electric oil heater, but also reduce the possibility of the local temperature of the heat sink being too high and exceeding the dangerous range, and reduce the risk of people being scalded by high temperature when using the electric oil heater.

Description

Technical Field

[0001] The invention belongs to the technical field of household heating devices, and in particular relates to a heat sink and an electric oil heater. Background Art

[0002] Electric oil heater is also called electric oil heater. It is mainly composed of electric heating element, heating element, heat sink, temperature control element and power switch. The heating element is set in the lower oil cavity of a part of the heat sink. It can generate heat after power is turned on, and transfer heat with the help of the oil in the heat sink, so that each heat sink can generate heat and heat the surrounding air, thereby adjusting the surrounding air temperature. Figure 7 As shown, it is found through experiments that, since the oil circuit of the existing heat sink 300 has the same flow cross section in the upper section 91, the middle section 92 and the lower section 93 of the body 9, that is, the thickness of each channel in the oil circuit is consistent, the temperature of the upper section 91 of the body 9 and the temperature of the lower section 93 of the body 9 are both greater than the temperature of the middle section 92 of the body 9 (see Figure 8 ), which not only affects the heating effect of the oil heater, but also easily causes the local temperature of the heat sink 300 to be too high and exceed the dangerous range, increasing the risk of scalding the human body by the oil heater. Summary of the invention

[0003] In order to solve all or part of the above problems, the purpose of the present invention is to provide a heat sink and an electric oil heater, which can improve the uneven heating problem of the heat sink and the electric oil heater. This can not only improve the heating effect of the electric oil heater, but also reduce the possibility of local overtemperature of the heat sink exceeding the dangerous range, and reduce the risk of people being burned by high temperature when using the electric oil heater.

[0004] According to a first aspect of the present invention, a heat sink for an electric oil radiator is provided, comprising: a body, which includes an upper section, a middle section and a lower section: an upper oil chamber provided in the upper section of the body; a lower oil chamber provided in the lower section of the body; an oil circuit, comprising: a first main circuit provided in the upper section of the body and used to connect the upper oil chamber; a plurality of first branches provided in the upper section of the body and used to connect the first main circuit; a second main circuit provided in the middle section of the body and used to connect the plurality of first branches; a plurality of second branches provided in the middle section of the body and used to connect the second main circuit; a third main circuit provided in the middle section of the body and used to connect the plurality of second branches, a plurality of third branches provided in the lower section of the body and used to connect the third main circuit, and a fourth main circuit provided in the lower section of the body and used to connect the lower oil chamber and the plurality of third branches; wherein the sum of the average flow cross-sectional areas of the plurality of the third branches is greater than the sum of the average flow cross-sectional areas of the plurality of the first branches, and is less than the sum of the average flow cross-sectional areas of the plurality of the second branches. The sum of the volumes of the fourth trunk and all the third branches is greater than the sum of the volumes of the first trunk and all the first branches, and less than the sum of the volumes of the second trunk, the third trunk and all the second branches.

[0005] Furthermore, in any one of the first branch, the second branch and the third branch, its maximum flow cross-sectional area is 1-15 times of its minimum flow cross-sectional area.

[0006] Furthermore, the sum of the average flow cross-sectional areas of the second branches is 4-10 times the sum of the average flow cross-sectional areas of the first branches; the sum of the average flow cross-sectional areas of the multiple third branches is 1.5-3 times the sum of the average flow cross-sectional areas of the first branches.

[0007] Furthermore, the sum of the volumes of the second trunk, the third trunk and all the second branches is 1.5-2 times the sum of the volumes of the first trunk and all the first branches, and the sum of the volumes of the fourth trunk and all the third branches is 2 times the sum of the volumes of the first trunk and all the first branches.

[0008] Furthermore, the first branch includes a first section, a second section and a third section, the flow cross-sectional area of ​​the first section gradually decreases along the top-down direction, the flow cross-sectional area of ​​the second section remains constant along the top-down direction, and the flow cross-sectional area of ​​the third section gradually increases along the top-down direction.

[0009] Furthermore, the second branch includes a fourth section, a fifth section and a sixth section, the flow cross-sectional area of ​​the fourth section gradually increases along the bottom-up direction, the flow cross-sectional area of ​​the fifth section remains constant along the bottom-up direction, and the flow cross-sectional area of ​​the sixth section gradually decreases along the bottom-up direction.

[0010] Furthermore, the third branch includes a seventh section, an eighth section, a ninth section and a tenth section, the flow cross-sectional area of ​​the seventh section first gradually increases along the bottom-up direction, the flow cross-sectional area of ​​the eighth section gradually decreases along the bottom-up direction, the flow cross-sectional area of ​​the ninth section remains constant along the bottom-up direction, and the flow cross-sectional area of ​​the tenth section gradually decreases along the bottom-up direction.

[0011] Furthermore, the number of the third branches is three, the number of the second branches is two, and the number of the first branches is three.

[0012] Furthermore, the heat sink material includes carbon steel, alloy steel and aluminum alloy.

[0013] According to a second aspect of the present invention, there is provided an oil-heated radiator, comprising the heat sink according to the first aspect of the present invention.

[0014] In the prior art, the cross-sectional areas of the oil circuits in the upper, middle and lower sections of the main body are equal, resulting in the heat of the upper section of the main body and the heat of the lower section of the main body being greater than the heat of the middle section of the main body. The electric oil heater and the heat sink for the electric oil heater of the present invention improve the oil circuit in the heat sink to improve the heat distribution. The oil circuit is mainly composed of a first trunk, a first branch, a second trunk, a second branch, a third trunk, a third branch and a fourth trunk, wherein the sum of the average cross-sectional areas of the third branches is greater than the sum of the average cross-sectional areas of the first branches, and less than the sum of the average cross-sectional areas of the second branches. The sum of the volumes of the fourth trunk and all the third branches is greater than the sum of the volumes of the first trunk and all the first branches, and less than the sum of the volumes of the second trunk, the third trunk and all the second branches. Since the sum of the volumes of the fourth trunk and all the third branches is greater than the sum of the volumes of the first trunk and all the first branches, and less than the sum of the volumes of the second trunk, the third trunk and all the second branches, the volume of the oil circuit in the lower section of the body is greater than the volume of the oil circuit in the upper section of the body, and less than the volume of the oil circuit in the middle section of the body, this can increase the reserve of heat transfer oil in the middle section of the body, thereby increasing the heat reserve in the middle section of the body, and using the middle section of the body with high heat reserve to affect the temperature of the upper section and the lower section of the body, so that the temperature of the upper section and the lower section of the body is close to the temperature of the middle section of the body, thereby improving the thermal distribution of the heat sink. In addition, the heat sink optimizes the flow section size of each branch, so that the heat transfer rate of each branch is adapted to the expected heating demand of the section where it is located, and further improves the thermal distribution of the heat sink. At the same time, because the electric oil heater and the heat sink used for the electric oil heater of the present invention can improve the problem of uneven heating of the heat sink and the electric oil heater, this can not only improve the heating effect of the electric oil heater, but also reduce the possibility of local overtemperature of the heat sink exceeding the dangerous range, and reduce the risk of people being burned by high temperature when using the electric oil heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. In the drawings:

[0016] Figure 1 The oil-filled electric heater according to an embodiment of the present invention is schematically shown;

[0017] Figure 2 A cross-sectional view schematically shows a heat sink of an oil heater according to an embodiment of the present invention;

[0018] Figure 3 for Figure 2 A partial enlargement of the heat sink shown Figure 1 ;

[0019] Figure 4 for Figure 2 A partial enlargement of the heat sink shown Figure 2;

[0020] Figure 5 for Figure 2 A partial enlargement of the heat sink shown Figure 3 ;

[0021] Figure 6 for Figure 2 Thermal image of the heat sink shown in use;

[0022] Figure 7 A cross-sectional view of a heat sink of an existing electric oil heater is schematically shown;

[0023] Figure 8 for Figure 7 Thermal image of the heat sink shown in use.

[0024] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] Figure 1 The oil-filled electric heater according to an embodiment of the present invention is schematically shown; Figure 2 The cross-sectional view of the heat sink of the oil heater according to the embodiment of the present invention is schematically shown; Figure 1 , Figure 2As shown, the electric oil heater 200 includes a plurality of heat sinks 100 connected in sequence. The heat sink 100 includes a body 1, and the body 1 includes an upper section 11, a middle section 12, and a lower section 13. The heat sink 100 also includes an upper oil chamber 21 provided in the upper section 11 of the body, a lower oil chamber 22 provided in the lower section 13 of the body, and an oil circuit provided in the body 1. The oil circuit includes a first trunk 31 provided in the upper section 11 of the main body and used to connect the upper oil chamber 21, a plurality of first branches 32 provided in the upper section 11 of the main body 1 and used to connect the first trunk 31, a second trunk 33 provided in the middle section 12 of the main body 1 and used to connect the plurality of first branches 32, a plurality of second branches 34 provided in the middle section 12 of the main body 1 and used to connect the second trunk 33, a third trunk 35 provided in the middle section 12 of the main body 1 and used to connect the plurality of second branches 34, a plurality of third branches 36 provided in the lower section 13 of the main body 1 and used to connect the third trunk 35, and a fourth trunk 37 provided in the lower section 13 of the main body 1 and used to connect the lower oil chamber 22 and the plurality of third branches 36. The sum of the average flow cross-sectional areas of the plurality of third branches 36 is greater than the sum of the average flow cross-sectional areas of the plurality of first branches 32, and less than the sum of the average flow cross-sectional areas of the plurality of second branches 34. The sum of the volumes of the fourth trunk 37 and all the third branches 36 is greater than the sum of the volumes of the first trunk 31 and all the first branches 32, and less than the sum of the volumes of the second trunk 33, the third trunk 35 and all the second branches 34. The so-called average flow cross-sectional area = (maximum flow cross-sectional area + minimum flow cross-sectional area) / 2.

[0027] In the prior art, the cross-sectional areas of the oil circuits in the upper section 91, the middle section 92 and the lower section 93 of the body 9 are equal, resulting in that the heat of the upper section 91 of the body 9 and the heat of the lower section 93 of the body 9 are both greater than the heat of the middle section 92 of the body. The electric oil heater 200 and the heat sink 100 for the electric oil heater 200 of the present invention improve the oil circuit in the heat sink 100 to improve the thermal distribution. The oil circuit is mainly composed of a first main circuit 31, a first branch circuit 32, a second main circuit 33, a second branch circuit 34, a third main circuit 35, a third branch circuit 36 ​​and a fourth main circuit 37, wherein the sum of the average cross-sectional areas of the plurality of third branches 36 is greater than the sum of the average cross-sectional areas of the plurality of first branches 32, and is less than the sum of the average cross-sectional areas of the plurality of second branches 34. The sum of the volumes of the fourth trunk 37 and all the third branches 36 is greater than the sum of the volumes of the first trunk 31 and all the first branches 32 , and is less than the sum of the volumes of the second trunk 33 , the third trunk 35 and all the second branches 34 . Since the sum of the volumes of the fourth trunk 37 and all the third branches 36 is greater than the sum of the volumes of the first trunk 31 and all the first branches 32, and is smaller than the sum of the volumes of the second trunk 33, the third trunk 35 and all the second branches 34, the volume of the oil circuit in the lower section 13 of the body 1 is greater than the volume of the oil circuit in the upper section 11 of the body 1, and is smaller than the volume of the oil circuit in the middle section 12 of the body 1, which can increase the reserve amount of heat transfer oil in the middle section 12 of the body 1, and thus increase the heat reserve in the middle section 12 of the body 1, and use the middle section 12 of the body 1 with a high heat reserve to affect the temperature of the upper section 11 of the body 1 and the lower section 13 of the body 1, so that the temperature of the upper section 11 of the body 1 and the lower section 13 of the body 1 is close to the temperature of the middle section 12 of the body 1, thereby improving the thermal distribution of the heat sink 100, such as Figure 6 As shown. Moreover, the heat sink 100 optimizes the flow cross-sectional size of each branch so that the heat transfer rate of each branch is adapted to the expected heating demand of the section where it is located, and further improves the thermal distribution of the heat sink. At the same time, it is precisely because the electric oil heater 200 and the heat sink 100 used for the electric oil heater 200 of the present invention can improve the uneven heating problem of the heat sink and the electric oil heater, which can not only improve the heating effect of the electric oil heater, but also reduce the possibility of the local temperature of the heat sink being too high and exceeding the dangerous range, and reduce the risk of people being burned by high temperature when using the electric oil heater.

[0028] It has been verified through experiments that in any one of the first branch 32 , the second branch 34 and the third branch 36 , when its maximum flow cross-sectional area is 1-15 times its minimum flow cross-sectional area, it is beneficial to maintain uniform distribution of heat near the first branch 32 , the second branch 34 or the third branch 36 .

[0029] It has been verified through experiments that when the sum of the average flow cross-sectional areas of the multiple second branches 34 is 4-10 times the sum of the average flow cross-sectional areas of the multiple first branches 32, and the sum of the average flow cross-sectional areas of the multiple third branches 36 is 1.5-3 times the sum of the average flow cross-sectional areas of the multiple first branches 32, the heating uniformity of the heat sink 100 and the electric oil heater can be further improved.

[0030] It has been verified through experiments that when the sum of the volumes of the second main circuit 33, the third main circuit 35 and all the second branches 34 is 1.5-2 times the sum of the volumes of the first main circuit 31 and all the first branches 32, and the sum of the volumes of the fourth main circuit 37 and all the third branches 36 is 2 times the sum of the volumes of the first main circuit 31 and all the first branches 32, the heating uniformity of the heat sink and the electric oil heater can be further improved.

[0031] In this embodiment, if Figure 3 As shown, the first branch 32 includes a first section 321, a second section 322 and a third section 323. The flow cross-sectional area of ​​the first section 321 gradually decreases from top to bottom, the flow cross-sectional area of ​​the second section 322 remains constant from top to bottom, and the flow cross-sectional area of ​​the third section 323 gradually increases from top to bottom. In this way, the flow velocity of the heat transfer oil during the heated flow can be reduced, so that the heat distribution of the upper section 11 of the heat sink 100 is more uniform.

[0032] In this embodiment, if Figure 4 As shown, the second branch 34 includes a fourth section 341, a fifth section 342 and a sixth section 343. The flow cross-sectional area of ​​the fourth section 341 gradually increases along the bottom-up direction, the flow cross-sectional area of ​​the fifth section 342 remains constant along the bottom-up direction, and the flow cross-sectional area of ​​the sixth section 343 gradually decreases along the bottom-up direction. This can not only reduce the flow speed of the heat transfer oil when it is heated, but also store a large amount of heat transfer oil in the second branch 34 to neutralize and maintain a constant temperature, so that the heat distribution of the middle section 12 of the heat sink 100 is more uniform.

[0033] In this embodiment, if Figure 5 As shown, the third branch 36 includes the seventh section 361, the eighth section 362, the ninth section 363 and the tenth section 364. The flow cross-sectional area of ​​the seventh section 361 gradually increases along the bottom-up direction, the flow cross-sectional area of ​​the eighth section 362 gradually decreases along the bottom-up direction, the flow cross-sectional area of ​​the ninth section 363 remains constant along the bottom-up direction, and the flow cross-sectional area of ​​the tenth section 364 gradually decreases along the bottom-up direction. In this way, the flow velocity of the heat transfer oil when it is heated can be reduced, so that the heat distribution of the lower section 13 of the heat sink 100 is more uniform.

[0034] In this embodiment, the more branches there are, the more uniform the heat is, but the higher the manufacturing cost is. Therefore, in order to achieve low cost while taking into account good heat uniformity, it is recommended that the number of third branches 36 be three, the number of second branches 34 be two, and the number of first branches 32 be three.

[0035] In this embodiment, the heat sink 100 is made of carbon steel, alloy steel and aluminum alloy. In order to balance the heat dissipation effect and cost, the heat sink 100 is preferably made of carbon steel.

[0036] In summary, the oil-heated heater 200 of the present invention can effectively improve the problem of uneven heating of the heat sink 100 and the oil-heated heater 200, which can not only improve the heating effect of the oil-heated heater 200, but also reduce the possibility of local overtemperature of the heat sink 100 exceeding the dangerous range, and reduce the risk of people being burned by high temperature when using the oil-heated heater.

[0037] In the description of the present application, it should be understood that the terms "upper", "lower", "inner", etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are 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 understood as a limitation on the present invention.

[0038] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0039] In this application, unless otherwise clearly specified and limited, the term "connection" and other terms 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The above is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician in the field can easily make changes or variations within the technical scope disclosed in the present invention, and such changes or variations should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims. As long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A heat sink for an electric oil heater, characterized in that: include: The body includes the upper section, the middle section and the lower section: an oiling chamber disposed in the upper section of the body; A lower oil chamber provided in the lower section of the body; An oil circuit, the oil circuit comprising: a first trunk circuit provided in the upper section of the body and used to connect the upper oil chamber; a plurality of first branches provided in the upper section of the body and used to connect the first trunk circuit; a second trunk circuit provided in the middle section of the body and used to connect the plurality of first branches; a plurality of second branches provided in the middle section of the body and used to connect the second trunk circuit; a third trunk circuit provided in the middle section of the body and used to connect the plurality of second branches, a plurality of third branches provided in the lower section of the body and used to connect the third trunk circuit, and a fourth trunk circuit provided in the lower section of the body and used to connect the lower oil chamber and the plurality of third branches; The sum of the average flow cross-sectional areas of the plurality of the third branches is greater than the sum of the average flow cross-sectional areas of the plurality of the first branches, and less than the sum of the average flow cross-sectional areas of the plurality of the second branches; the average flow cross-sectional areas of the first branch, the second branch and the third branch are respectively half of the sum of the maximum flow cross-sectional area and the minimum flow cross-sectional area of ​​the corresponding branches; The sum of the volumes of the fourth main road and all the third branches is greater than the sum of the volumes of the first main road and all the first branches, and less than the sum of the volumes of the second main road, the third main road and all the second branches; in any one of the first branch, the second branch and the third branch, its maximum flow cross-sectional area is 1-15 times its minimum flow cross-sectional area.

2. The heat sink according to claim 1, characterized in that: The sum of the average flow cross-sectional areas of the second branches is 4-10 times the sum of the average flow cross-sectional areas of the first branches; the sum of the average flow cross-sectional areas of the multiple third branches is 1.5-3 times the sum of the average flow cross-sectional areas of the first branches.

3. The heat sink according to claim 2, characterized in that: The sum of the volumes of the second trunk, the third trunk and all the first branches is 1.5-2 times the sum of the volumes of the first trunk and all the second branches, and the sum of the volumes of the fourth trunk and all the third branches is 2 times the sum of the volumes of the first trunk and all the first branches.

4. The heat sink according to claim 1, characterized in that: The first branch includes a first section, a second section and a third section. The flow cross-sectional area of ​​the first section gradually decreases from top to bottom, the flow cross-sectional area of ​​the second section remains constant from top to bottom, and the flow cross-sectional area of ​​the third section gradually increases from top to bottom.

5. The heat sink according to claim 1, characterized in that: The second branch includes a fourth section, a fifth section and a sixth section. The flow cross-sectional area of ​​the fourth section gradually increases along the bottom-up direction, the flow cross-sectional area of ​​the fifth section remains constant along the bottom-up direction, and the flow cross-sectional area of ​​the sixth section gradually decreases along the bottom-up direction.

6. The heat sink according to claim 1, characterized in that: The third branch includes the seventh, eighth, ninth and tenth sections, the flow cross-sectional area of ​​the seventh section gradually increases along the bottom-up direction, the flow cross-sectional area of ​​the eighth section gradually decreases along the bottom-up direction, the flow cross-sectional area of ​​the ninth section remains constant along the bottom-up direction, and the flow cross-sectional area of ​​the tenth section gradually decreases along the bottom-up direction.

7. The heat sink according to claim 1, characterized in that: The number of the third branches is three, the number of the second branches is two, and the number of the first branches is three.

8. The heat sink according to claim 1, characterized in that: The heat sink material includes carbon steel, alloy steel and aluminum alloy.

9. An electric oil heater, characterized in that: Comprising a heat sink according to any one of claims 1 to 8.

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