Electrical oil heater

Abstract

The utility model provides an electrical oil heater, which comprises a plurality of radiating fin groups, a plurality of radiating fins and a plurality of radiating fins, each radiating fin group comprises an oil pocket, and the plurality of radiating fin groups are connected through the oil pockets; and the accommodating space is formed between two adjacent oil pockets in the plurality of radiating fin groups and is used for accommodating welding flux so as to connect the two adjacent oil pockets.

Description

Technical Field

[0001] The utility model relates to the technical field of oil radiator manufacturing, in particular to an electric oil radiator. Background Art

[0002] Normally, in the process of preparing electric oil heaters, two adjacent layers of heat sinks usually need to be welded together through oil packs, and conventional technology requires pressure resistance welding. During the pressure resistance welding process, the two oil packs are tightly clamped together by the upper and lower electrodes, and then heated by electric current to increase the temperature of the contact point to the melting point, thereby achieving welding between the two oil packs. However, pressure resistance welding can only weld two adjacent layers of heat sinks at a time, and cannot weld multiple layers together, so the efficiency is low. On the other hand, pressure resistance welding destroys the main structure of the oil pack, resulting in reduced overall performance. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art or related technology.

[0004] To this end, the utility model provides an electric oil heater.

[0005] The utility model provides an electric oil heater, comprising: a plurality of heat sink groups, each heat sink group comprising an oil bag, and the plurality of heat sink groups are connected through the oil bags; and a containing space is formed between two adjacent oil bags in the plurality of heat sink groups, and is used to contain solder to connect the two adjacent oil bags.

[0006] The utility model defines a holding space between two oil bags, and realizes the connection between two adjacent oil bags through the solder in the holding space. Compared with pressure resistance welding, there is no need to destroy the structure of the oil bag body, thereby improving the overall strength. In addition, since the pressure resistance welding method is not adopted, the electric oil heater of the utility model does not require electrodes during the preparation process, so the heat sink at the end does not need to have avoidance holes, and the cover part is eliminated, thereby reducing manufacturing costs, reducing quality abnormalities, and improving manufacturing efficiency. It should be noted that the electric oil heater of the utility model can include a solder structure, and the solder structure is arranged inside the holding space. In this way, two adjacent oil bags are connected by the solder structure. Compared with pressure resistance welding, there is no need to destroy the structure of the oil bag body, thereby improving the overall strength.

[0007] In some technical solutions, optionally, two adjacent oil bags include a first oil bag and a second oil bag, and the electric oil heater also includes: a first groove, which is arranged on the first oil bag, and the second oil bag is arranged relatively to the first groove to surround the first oil bag to form a accommodating space.

[0008] In this technical solution, by providing the first groove on the first oil bag, the first groove and the second oil bag define a containing space, which is convenient for processing and does not require complicated design steps. On the other hand, since the first groove and the second oil bag can define a closed containing space, the solder in the containing space will not flow out during the preparation of the electric oil heater of the utility model, thereby improving the connection strength.

[0009] In some technical solutions, optionally, the electric oil heater further includes: a second groove, arranged on the second oil bag; and the accommodating space includes the first groove and the second groove.

[0010] In this technical solution, by providing grooves on both the first oil bag and the second oil bag, on the one hand, the volume of the grooves is increased, ensuring the connection strength between the first oil bag and the second oil bag, and on the other hand, compared with providing grooves on the same oil bag, the problem of the oil bag being easily broken relative to the other oil bags due to the grooves being too large or too deep is avoided, that is, by sharing the grooves between the two oil bags, the overall structure can be made more stable. On the other hand, by providing grooves on both the first oil bag and the second oil bag, the contact area between the solder and the first oil bag and the second oil bag can be increased, thereby improving the connection strength between the first oil bag and the second oil bag.

[0011] In some technical solutions, optionally, the first oil bag includes: a contact section, two adjacent oil bags are connected by the contact section, and the first groove is formed by the inward depression of the contact section of the first oil bag.

[0012] In this technical solution, each oil bag includes a contact section, and two adjacent oil bags are connected by the contact section. The first groove is formed by the inward depression of the contact section of the first oil bag. The utility model forms the first groove by the inward depression of the contact section. This method is easy to process. For example, it is only necessary to bend the contact section to form the first groove, and no complicated processing steps are required.

[0013] In some technical solutions, optionally, a ratio of the depth of the first groove to the thickness of the contact segment is greater than or equal to 0.8 and less than or equal to 1.2.

[0014] In this technical solution, the depth of the first groove is limited to ensure the connection strength between the first oil bag and the second oil bag, without causing the groove to be too deep, thereby increasing the difficulty of preparing the contact section.

[0015] In some technical solutions, optionally, the electric oil heater further includes: an oil passage, which is arranged on the interconnected oil bags and penetrates the interconnected oil bags; wherein the accommodating space is arranged along the circumference of the oil passage.

[0016] In this technical solution, an oil hole is provided on the contact section of each oil bag, and two adjacent oil bags are connected through the oil hole. The oil holes connected to each other on each two adjacent contact sections constitute an oil passage, and the accommodating space is arranged along the circumference of the oil passage, so that the connection strength between the two contact sections can be higher and the stability can be better.

[0017] In some technical solutions, optionally, the accommodating space is an annular groove arranged around the oil passage.

[0018] In this technical solution, the accommodating space is an annular groove, which is more conducive to the preparation of the accommodating space. That is, in the process of preparing the oil bag, an annular groove can be prepared on the contact section by integrated molding, thereby improving the preparation efficiency.

[0019] In some technical solutions, optionally, there are multiple accommodating spaces, and the multiple accommodating spaces are arranged at intervals along the circumference of the oil passage.

[0020] In this technical solution, compared with the above-mentioned annular groove method, it is more conducive to changing the shape of the accommodating space, so that it can match welding rods of more shapes.

[0021] In some technical schemes, optionally, multiple heat sink groups are arranged in sequence along a first direction, each heat sink group includes two heat sinks arranged opposite to each other and connected along the first direction, each heat sink is provided with a protrusion extending in a direction away from the other heat sink, and the oil bag is surrounded by the two protrusions; along the first direction, the outer wall surfaces of the two protrusions on the two end surfaces of the multiple heat sink groups are non-porous structures.

[0022] In this technical solution, each heat sink of the utility model is provided with a protrusion extending in a direction away from another heat sink, and the protrusion here is composed of a contact section and a transition section. The outer wall surfaces of the two protrusions at both ends along the first direction, that is, the contact sections at both ends of the electric oil heater, are non-porous structures, and the non-porous structure, that is, the contact sections at both ends of the electric oil heater, are not provided with avoidance holes. Since the utility model changes the welding method, there is no need to open avoidance holes on the heat sinks of the oil packs at both ends, and the outer wall surfaces of the protrusions of the first and tail heat sinks can be set to a non-porous structure, so there is no need to add subsequent welding and capping steps, which can further reduce the use of parts and the number of welding times, prevent the oil heater from leaking oil, and improve welding efficiency.

[0023] In some technical solutions, optionally, each heat sink group includes two oil bags, which are respectively arranged at two ends of the heat sink group, and each oil bag forms a containing space with the oil bag of the adjacent heat sink group.

[0024] In this technical solution, the oil bags at both ends of each heat sink group can form a holding space with the oil bags adjacent to the adjacent heat sink group, which can improve the connection strength between two adjacent heat sink groups and make the overall strength of the electric oil heater more stable.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0027] Figure 1 The welding principle diagram of the electric oil heater in the related art is shown;

[0028] Figure 2 A top view of an electric oil heater in the related art is shown;

[0029] Figure 3 Shows Figure 2 Cross-sectional view of the oil heater at AA;

[0030] Figure 4 Shows Figure 3 A magnified view of the M point of the oil heater of the China Electric Power Company;

[0031] Figure 5 A three-dimensional diagram of an electric oil heater in the related art is shown;

[0032] Figure 6 A top view of an electric oil heater according to an embodiment of the utility model is shown;

[0033] Figure 7 Shows Figure 6 Cross-sectional view of the oil heater at BB of the China Electric;

[0034] Figure 8 Shows Figure 7 Enlarged view of the N position of the oil heater before welding;

[0035] Fig. 9 Shows Figure 7 A magnified view of the N position after welding of the oil heater of the China Electric Power Co., Ltd.

[0036] Fig.10 A three-dimensional diagram of an electric oil heater according to an embodiment of the utility model is shown;

[0037] Fig.11 A block diagram of an electric oil heater according to an embodiment of the utility model is shown;

[0038] Fig.12The present invention shows a flow chart of a method for preparing an electric oil heater according to an embodiment of the present invention.

[0039] in, Figures 1 to 5 The corresponding relationship between the reference numerals and the component names is as follows:

[0040] 1' electric oil heater, 111' heat sink, 112' oil bag, 1122' contact section, 113' sheet body, 12' cover, 2' welding electrode;

[0041] Figures 6 to 10 The corresponding relationship between the reference numerals and the component names is as follows:

[0042] 1 electric oil heater, 11 heat sink group, 111 heat sink, 112 oil bag, 1122 first oil bag, 11222 contact section, 11224 transition section, 11226 protrusion, 1124 second oil bag, 1126 third oil bag, 12 accommodating space, 13 solder, 14 first groove, 15 second groove, 16 oil channel. DETAILED DESCRIPTION

[0043] In order to more clearly understand the above aspects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0044] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0045] like Figure 6 , Figure 7 , Figure 8 and Fig. 9 As shown, the electric oil heater 1 provided by the utility model includes: a plurality of heat sink groups 11, each heat sink group 11 includes an oil bag 112, and the plurality of heat sink groups 11 are connected through the oil bag 112; a receiving space 12 is formed between two adjacent oil bags 112 in the plurality of heat sink groups 11, and is used to receive solder to connect two adjacent oil bags 112.

[0046] The utility model defines a receiving space 12 between two oil bags 112, and realizes the connection of two adjacent oil bags 112 through the solder 13 in the receiving space 12. In this way, compared with pressure resistance welding, there is no need to destroy the structure of the main body of the oil bag 112, thereby improving the overall strength. In addition, since the pressure resistance welding method is not adopted, the electric oil heater 1 of the utility model does not require electrodes during the preparation process, so the heat sink 111 at the end does not need to have an avoidance hole, and the cover part is eliminated, thereby reducing manufacturing costs, reducing quality abnormalities, and improving manufacturing efficiency.

[0047] In some embodiments, optionally, two adjacent oil bags 112 include a first oil bag 1122 and a second oil bag 1124, and the electric oil heater 1 also includes: a first groove 14, which is arranged on the first oil bag 1122, and the second oil bag 1124 is arranged relatively to the first groove 14 to enclose a receiving space 12 with the first oil bag 1122.

[0048] In this embodiment, by setting the first groove 14 on the first oil bag 1122, the first groove 14 and the second oil bag 1124 define the accommodation space 12, which is convenient for processing and does not require complicated design steps. On the other hand, since the first groove 14 and the second oil bag 1124 can define a closed accommodation space 12, the solder 13 in the accommodation space 12 will not flow out during the preparation of the electric oil heater 1 of the utility model, thereby improving the connection strength.

[0049] In some embodiments, optionally, Fig.11 As shown, the electric oil heater 1 further includes: a second groove 15 disposed on the second oil bag 1124 ; and the accommodating space 12 includes a first groove 14 and a second groove 15 .

[0050] In this embodiment, by providing grooves on both the first oil bag 1122 and the second oil bag 1124, on the one hand, the volume of the grooves is increased, ensuring the connection strength between the first oil bag 1122 and the second oil bag 1124. On the other hand, compared with providing grooves on the same oil bag 112, the problem of the oil bag 112 being easily broken relative to the other oil bags 112 due to the grooves being too large or too deep is avoided, that is, by sharing the grooves between the two oil bags 112, the overall structure can be made more stable. On the other hand, by providing grooves on both the first oil bag 1122 and the second oil bag 1124, the contact area between the solder 13 and the first oil bag 1122 and the second oil bag 1124 can be increased, thereby improving the connection strength between the first oil bag 1122 and the second oil bag 1124.

[0051] In some embodiments, optionally, the first oil bag 1122 includes: a contact section 11222 , two adjacent oil bags 112 are connected by the contact section 11222 , and the first groove 14 is formed by the inward depression of the contact section 11222 of the first oil bag 1122 .

[0052] In this embodiment, each oil bag 112 includes a contact section 11222, and two adjacent oil bags 112 are connected by the contact section 11222. The first groove 14 is formed by the inward depression of the contact section 11222 of the first oil bag 1122. The utility model forms the first groove 14 by the inward depression of the contact section 11222. This method is easy to process. For example, it is only necessary to bend the contact section 11222 to form the first groove 14, and no complicated processing steps are required.

[0053] In some embodiments, optionally, a ratio of the depth of the first groove 14 to the thickness of the contact segment 11222 is greater than or equal to 0.8 and less than or equal to 1.2.

[0054] In this embodiment, the depth of the first groove 14 is limited to ensure the connection strength between the first oil bag 1122 and the second oil bag 1124 without causing the groove to be too deep, thereby increasing the difficulty of preparing the contact section 11222 .

[0055] In some embodiments, optionally, Fig.11 As shown, the electric oil heater 1 further includes an oil passage 16 , which is disposed on the interconnected oil bags 112 and penetrates the interconnected oil bags 112 ; wherein the accommodating space 12 is disposed along the circumference of the oil passage 16 .

[0056] In this embodiment, an oil hole is provided on the contact section 11222 of each oil bag 112, and two adjacent oil bags 112 are connected through the oil hole. The oil holes connected to each other on each two adjacent contact sections 11222 constitute an oil passage 16, and the accommodating space 12 is arranged along the circumference of the oil passage 16, so that the connection strength between the two contact sections 11222 can be higher and the stability can be better.

[0057] In some embodiments, optionally, the accommodating space 12 is an annular groove, which is arranged around the oil passage 16 .

[0058] In this embodiment, the accommodating space 12 is an annular groove, which is more conducive to the preparation of the accommodating space 12. That is, in the process of preparing the oil bag 112, an annular groove can be prepared on the contact section 11222 by integral molding, thereby improving the preparation efficiency.

[0059] In some embodiments, optionally, there are multiple accommodating spaces 12 , and the multiple accommodating spaces 12 are arranged at intervals along the circumference of the oil passage 16 .

[0060] In this embodiment, compared with the above-mentioned annular groove method, it is more conducive to changing the shape of the accommodating space 12, so as to match welding rods of more shapes.

[0061] In some embodiments, optionally, Fig.10 As shown, a plurality of heat sink groups 11 are arranged in sequence along a first direction, each heat sink group 11 includes two heat sinks 111 that are arranged opposite to and connected along the first direction, each heat sink 111 is provided with a protrusion 11226 extending in a direction away from the other heat sink 111, and the oil bag 112 is surrounded by the two protrusions 11226; along the first direction, the outer wall surfaces of the two protrusions 11226 on the two end surfaces of the plurality of heat sink groups 11 are non-porous structures.

[0062] In this embodiment, each heat sink 111 of the utility model is provided with a protrusion 11226 extending in a direction away from another heat sink 111, wherein the protrusion 11226 is composed of a contact section 11222 and a transition section 11224. Along the first direction, the outer wall surfaces of the two protrusions 11226 at both ends of the plurality of heat sink groups 11, that is, the contact sections 11222 at both ends of the electric oil heater 1 are non-porous structures, and the non-porous structure, that is, the contact sections 11222 at both ends of the electric oil heater 1 along the first direction are not provided with avoidance holes. Since the utility model changes the welding method, there is no need to open avoidance holes on the oil bags 112 at both ends, and the outer wall surfaces of the protrusions 11226 of the head and tail heat sinks 111 can be set to a non-porous structure, so there is no need to increase the subsequent welding and capping steps, which can further reduce the use of parts and the number of welding times, prevent the oil heater from leaking oil, and improve welding efficiency.

[0063] In some embodiments, optionally, each heat sink group 11 includes two oil bags 112 , which are respectively arranged at two ends of the heat sink group 11 , and each oil bag 112 forms a receiving space 12 with the oil bag 112 of the adjacent heat sink group 11 .

[0064] In this embodiment, the oil bags 112 at both ends of each heat sink group 11 can form a receiving space 12 with the oil bags 112 adjacent to the adjacent heat sink group 11, which can improve the connection strength between two adjacent heat sink groups 11 and make the overall strength of the electric oil heater 1 more stable.

[0065] In addition, another embodiment also provides a method for preparing an electric oil heater, wherein the electric oil heater comprises a plurality of heat sink groups, each heat sink group comprises an oil bag, such as Fig.12 As shown, the preparation method of the electric oil heater comprises:

[0066] S102: machining a groove on a connection surface of at least one of the two oil bags to be connected;

[0067] S104: arranging a plurality of heat sink groups in sequence along a first direction, and making two adjacent oil bags contact each other, and filling solder between any two adjacent oil bags to form a pre-assembled component;

[0068] S106: placing the pre-assembled component in a vacuum heating furnace for heating to melt the solder;

[0069] S108: Cooling the heated pre-assembled component to obtain a completed electric oil heater, wherein the melted and cooled solder can connect two adjacent oil bags.

[0070] The preparation method of the electric oil heater of the present embodiment mainly processes a groove on the connecting surface of the oil bag 112, and the groove is used to place the brazing material. Then, another oil bag 112 without the groove is put together, and the original pressure resistance welding is changed to vacuum furnace brazing. The stacked heat sink 111 is placed in a vacuum brazing furnace. The high temperature in the furnace melts the brazing material. Due to the capillary adsorption effect, the molten brazing material is adsorbed in the gap between the two heat sinks 111. After cooling, the two heat sinks 111 are welded together, and multiple pieces can be welded at the same time. The method of the present application solves the problems that the quality of pressure resistance welding is difficult to ensure, the welding defect rate is high, the rework rate is high, and the welding efficiency is low. In addition, the welding method adopted in the present embodiment does not require an electrode, so the heat sink 111 at the end does not need to have an avoidance hole, and the cover part is eliminated, which reduces the manufacturing cost, reduces quality abnormalities, and improves the manufacturing efficiency.

[0071] In some embodiments, optionally, the step of machining a groove on the connecting surface of at least one of the two oil bags 112 that need to be connected specifically includes: machining a groove on the connecting surface of at least one of the two oil bags 112 that need to be connected by extrusion, bending or cutting.

[0072] In this embodiment, the grooves are processed by extrusion, bending or cutting, which is easier to operate and does not require a complicated preparation process.

[0073] Next, the applicant describes the preparation method of the electric oil heater of this embodiment from another perspective. It should be understood that, Figure 1 , Figure 2 and Figure 3 As shown, the existing electric oil heater 1' is composed of a plurality of heat sinks 111' welded together by pressure resistance welding, each heat sink 111' includes a sheet body 113' and oil bags 112' arranged at both ends of the sheet body 113'. However, the existing method of welding by pressure resistance welding, such as Figure 1 As shown, only two pieces can be welded each time, and the efficiency is very low. There are many factors affecting the quality of pressure resistance welding, such as welding current, welding electrode 2', air pressure, cooling water, etc., so the welding quality is difficult to guarantee, the welding defect rate is high, the rework rate is high, and the welding efficiency is low.

[0074] In addition, if Figure 1 As shown, the pressure resistance welding requires that the heat sink 111' on the top be provided with an avoidance hole to ensure that the welding electrode 2' of the pressure resistance welding passes through. After the pressure resistance welding is completed, as shown in FIG. Figure 4 and Figure 5 As shown, the avoidance hole of the top heat sink 111' is also sealed with a cover 12' to prevent oil leakage. The cover 12' and the contact section 1122' of the top heat sink 111' are welded together by flame welding. In this way, not only the cover 12' is added, but also the quality and efficiency problems of the welding of the cover 12' are extended.

[0075] The preparation method of the electric oil heater provided in this embodiment has the following specific implementation steps:

[0076] Step 1: Assemble the first oil bag 1122 in the original manner. The first oil bag 1122 includes a transition section 11224 and a contact section 11222. The contact section 11222 is provided with an annular groove. Then, place the first oil bag 1122 on a fixed tool with the side with the annular groove facing upwards.

[0077] Step 2: Place the solder into the annular groove of the contact section 11222;

[0078] Step 3: Press another assembled second oil bag 1124 onto the other side of the brazing material. Similarly, an annular groove is also provided on the contact section 11222 between the second oil bag 1124 and the third oil bag 1126;

[0079] Step 4: Place the brazing material into the annular groove of the contact section 11222 of the second oil bag 1124;

[0080] Step 5: Press another assembled third oil bag 1126 onto the other side of the brazing material to form a three-chip machine;

[0081] Step 6. After completing the above steps, clamp the fixture, turn the product and the fixture 180 degrees and put them into the vacuum brazing furnace. After heating and cooling, the finished product is produced.

[0082] This embodiment mainly adds an annular groove on the contact section 11222, and the annular groove is used to place the brazing material. Then, another contact section 11222 without the annular groove is put together, and the original pressure resistance welding is changed to vacuum furnace brazing. The stacked heat sink 111 is placed in a vacuum brazing furnace. The high temperature in the furnace melts the brazing material. Due to the capillary adsorption effect, the molten solder is adsorbed in the gap between the two heat sinks 111. After cooling, the two heat sinks 111 are welded together, and multiple pieces can be welded at the same time. The method of the present application solves the problems that the quality of pressure resistance welding is difficult to ensure, the welding defect rate is high, the rework rate is high, and the welding efficiency is low. In addition, since electrodes are not required, the heat sink 111 at the end does not need to have avoidance holes, and the cover part is eliminated, thereby reducing manufacturing costs.

[0083] In the description of the present invention, the term "plurality" refers to two or more than two. Unless otherwise clearly defined, the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention. The terms "connection", "installation", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0084] In the description of the present invention, the terms "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0085] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electric oil heater, characterized in that: include: A plurality of fin groups, each of the fin groups comprising an oil bag, and the plurality of fin groups are connected via the oil bags; The accommodating space is formed between two adjacent oil bags in the plurality of heat sink groups and is used to accommodate solder to connect the two adjacent oil bags.

2. The electric oil heater according to claim 1, characterized in that: The two adjacent oil bags include a first oil bag and a second oil bag, and the electric oil heater also includes: The first groove is arranged on the first oil bag, and the second oil bag is arranged opposite to the first groove to surround the first oil bag to form the accommodating space.

3. The electric oil heater according to claim 2, characterized in that: Also includes: A second groove is provided on the second oil bag; The accommodation space includes the first groove and the second groove.

4. The electric oil heater according to claim 2, characterized in that: The first oil package includes: A contact section, two adjacent oil bags are connected by the contact section, and the first groove is formed by the inward depression of the contact section of the first oil bag.

5. The electric oil heater according to claim 4, characterized in that: A ratio of the depth of the first groove to the thickness of the contact segment is greater than or equal to 0.8 and less than or equal to 1.

2.

6. The oil-filled electric heater according to any one of claims 1 to 5, characterized in that: Also includes: An oil passage is provided on the oil bags connected to each other and penetrates the oil bags connected to each other; Wherein, the accommodation space is arranged along the circumference of the oil passage.

7. The electric oil heater according to claim 6, characterized in that: The accommodating space is an annular groove, which is arranged around the oil passage.

8. The electric oil heater according to claim 6, characterized in that: There are a plurality of accommodating spaces, and the plurality of accommodating spaces are arranged at intervals along the circumferential direction of the oil passage.

9. The oil-filled electric heater according to any one of claims 1 to 5, characterized in that: A plurality of heat sink groups are sequentially arranged along a first direction, each heat sink group comprises two heat sinks arranged opposite to and connected to each other along the first direction, each heat sink is provided with a protrusion extending in a direction away from the other heat sink, and the oil bag is surrounded by the two protrusions; Wherein, along the first direction, outer wall surfaces of two protrusions on both end surfaces of the plurality of heat sink assemblies are non-porous structures.

10. The oil-filled electric heater according to any one of claims 1 to 5, characterized in that: Each of the heat sink groups includes two oil bags, which are respectively arranged at two ends of the heat sink group, and each of the oil bags forms the accommodation space with the oil bags of the adjacent heat sink groups.

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