Annular transformer with high safety performance
By adopting an overlapping primary coil design on the toroidal iron core of the toroidal transformer and installing fuses in the partially stacked part, the problem of slow fuse temperature sensing speed is solved, and the high safety performance of the toroidal transformer is achieved.
Patent Information
- Application Number
- CN202421278929.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-05
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-06-05
AI Technical Summary
The existing toroidal transformers are prone to burn due to the slow temperature sensing speed of the fuse, which affects the safety of use.
By winding the primary coil on the annular iron core, a partial stacking part is formed by overlapping winding, and a fuse is installed on the partial stacking part. The two leads of the fuse are connected to the end of the wire and the end of the wire of the primary coil respectively to ensure that the fuse is secured. Ability to quickly sense temperature and achieve automatic disconnection.
The temperature sensing speed of the fuse is improved, ensuring that it can be fused quickly when the transformer is short-circuited, protecting the toroidal transformer from overheating damage, and improving the safety of use.
Smart Images
Figure CN222530191U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of transformers, in particular to a toroidal transformer with high safety performance. Background Art
[0002] A transformer is a device that uses the principle of electromagnetic induction to change AC voltage. Its main components are the primary coil, secondary coil and iron core. Its main functions include voltage conversion, current conversion, impedance conversion, isolation and voltage stabilization. In modern technology, transformers have been widely used in computers, medical equipment, telecommunications, instruments and lighting.
[0003] At present, the size and performance of the transformer will be controlled according to the needs of installation; the main function of controlling the size is to prevent the performance of the components from being affected due to the size not meeting the installation requirements; the main function of controlling the performance is to ensure the safety of product use. For example, in engineering, the size and performance are the thresholds reserved by the pre-station project for the post-station project, and are also the pre-buried facilities of the post-station interface project; in reality, after the toroidal transformer is manufactured, according to the installation conditions and application scenarios, the primary coil of the toroidal transformer needs to be wound and then the fuse needs to be installed, and then the secondary coil needs to be wound, so as to achieve high-temperature short-circuit protection and prevent the customer's whole machine from being damaged due to transformer abnormality. Therefore, installing a fuse is a process with better safety comprehensive performance applied in the field of transformer production. The installation method also varies according to the type and shape of the transformer. In the traditional fuse installation process, the pins are not fully expanded. After the secondary coil is wound, the copper wire is only pressed on the fuse body for temperature sensing, which makes the fuse slow in sensing temperature, while the transformer temperature is rising rapidly. When the transformer temperature reaches the design limit, it will cause burning, which seriously affects the safety of the toroidal transformer. Utility Model Content
[0004] The utility model aims to provide a toroidal transformer with high safety performance, which can solve the problem that the toroidal transformer is easy to burn out due to the slow temperature sensing speed of the fuse.
[0005] To achieve this purpose, the utility model adopts the following technical solutions:
[0006] A toroidal transformer with high safety performance, comprising a toroidal iron core, a primary coil, a fuse body and a secondary coil;
[0007] The primary coil is evenly wound on the annular core to form a primary coil winding layer, and the primary coil winding layer includes a first winding layer and at least one overlapping layer, the first winding layer is wound on the periphery of the annular core, and at least one overlapping layer is sequentially wound on the periphery of the first winding layer and the periphery of the adjacent overlapping layer;
[0008] The primary coil has a wire head end and a wire tail end, and the wire head end and the wire tail end are both exposed outside the primary coil winding layer;
[0009] The fuse body is mounted on the periphery of the outermost overlapping layer, and the fuse body is provided with two leads, which are respectively connected to the wire head end and the wire tail end;
[0010] The secondary coil is evenly wound on the primary coil winding layer and the periphery of the fuse body to form a secondary coil winding layer.
[0011] Preferably, the primary coil comprises a first overlapping layer;
[0012] The first winding layer is wound on the periphery of the annular core, and the first overlapping layer is wound on the periphery of the first winding layer.
[0013] Preferably, the winding area of the first winding layer is equal to the annular area of the annular core, and the overlapping area of the first winding layer and the first overlapping layer is three tenths of the annular area of the annular core.
[0014] Preferably, the primary coil comprises a first overlapping layer and a second overlapping layer;
[0015] The first winding layer is wound on the periphery of the annular core, the first overlapping layer is wound on the periphery of the first winding layer, and the second overlapping layer is wound on the periphery of the first overlapping layer.
[0016] Preferably, the winding area of the first winding layer and the winding area of the first overlapping layer are equal to the annular area of the annular core, and the overlapping area of the first overlapping layer and the second overlapping layer is three tenths of the annular area of the annular core.
[0017] Preferably, the two leads are distributed in a straight line on the periphery of the outermost overlapping layer, and the lead end and the lead tail end are respectively distributed at the starting end and the ending end of the outermost overlapping layer, and the two leads are respectively connected to the lead end and the lead tail end.
[0018] Preferably, the secondary coil winding layer includes a third overlapping layer and a fourth overlapping layer;
[0019] The third overlapping layer is wound on the periphery of the overlapping layer arranged as the outermost layer, and the fourth overlapping layer is wound on the periphery of the third overlapping layer.
[0020] Preferably, the winding area of the third overlapping layer and the winding area of the fourth overlapping layer are equal to the annular area of the annular core.
[0021] One of the above technical solutions has the following beneficial effects: the primary coil is wound on the annular core in an overlapping manner to form a first winding layer and at least one overlapping layer, so as to realize local stacking of the primary coil without changing the overall outer diameter of the product; this stacking design makes it possible to increase the temperature of the local stacking part by increasing the winding density of the primary coil while keeping the overall outer diameter of the product unchanged, wherein the temperature of the local stacking part rises after the short-circuit operation of the annular transformer, thereby becoming the highest temperature point; then the fuse is installed on the periphery of the local stacking part, i.e., the outermost overlapping layer, and the two leads of the fuse body are respectively connected to the wire head end and the wire tail end of the primary coil, so that the fuse body effectively transmits the temperature signal of the highest temperature point to the inside of the fuse body through the two pins. Therefore, when the circuit connected to the transformer is short-circuited, the operating temperature of the local stacking part in the transformer first reaches the preset control temperature of the fuse body, and the fuse body can be quickly melted to realize the automatic disconnection function of the circuit, thereby protecting the annular transformer from short-circuit overheating damage. In order to further ensure close contact and effective heat transfer between the fuse and the primary coil, and to increase the temperature sensing speed of the fuse body, the secondary coil is wound after the fuse is installed to ensure that the secondary coil can be evenly distributed around the primary coil and the fuse. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 This is a structural schematic diagram of a first embodiment of a toroidal transformer with high safety performance and a hidden secondary coil winding layer according to the utility model;
[0023] Figure 2 It is a cross-sectional schematic diagram of a first embodiment of a toroidal transformer with high safety performance of the utility model;
[0024] Figure 3 This is a structural schematic diagram of a second embodiment of a toroidal transformer with high safety performance and a hidden secondary coil winding layer according to the utility model;
[0025] Figure 4 It is a cross-sectional schematic diagram of a second embodiment of a toroidal transformer with high safety performance of the utility model;
[0026] Figure 5 This is a structural schematic diagram of a toroidal transformer with high safety performance in the utility model;
[0027] Figure 6 It is a top view schematic diagram of a toroidal transformer with high safety performance of the utility model;
[0028] In the drawings: an annular core 1, a primary coil 2, a fuse body 3, a secondary coil 4, an overlapping layer 20, a first winding layer 21, a first overlapping layer 22, a second overlapping layer 23, a lead wire 30, a wire head end 201, and a wire tail end 202. DETAILED DESCRIPTION
[0029] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.
[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships 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, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, the meaning of "plurality" is two or more.
[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0033] like Figure 1-6 As shown, a toroidal transformer with high safety performance includes a toroidal core 1, a primary coil 2, a fuse body 3 and a secondary coil 4;
[0034] The primary coil 2 is evenly wound on the annular core 1 to form a primary coil winding layer, and the primary coil winding layer includes a first winding layer 21 and at least one overlapping layer 20, the first winding layer 21 is wound on the periphery of the annular core 1, and at least one overlapping layer 20 is sequentially wound on the periphery of the first winding layer 21 and the periphery of the adjacent overlapping layer 20;
[0035] The primary coil 2 has a wire head end 201 and a wire tail end 202, and both the wire head end 201 and the wire tail end 202 are exposed outside the primary coil winding layer;
[0036] The fuse body 3 is mounted on the outer periphery of the outermost overlapping layer 20, and the fuse body 3 is provided with two leads 30, which are respectively connected to the wire head end 201 and the wire tail end 202;
[0037] The secondary coil 4 is evenly wound around the primary coil winding layer and the periphery of the fuse body 3 to form a secondary coil winding layer.
[0038] Specifically, the primary coil 2 is wound on the annular core 1 in an overlapping winding manner to form a first winding layer 21 and at least one overlapping layer 20, so as to realize the local stacking of the primary coil 2 without changing the overall outer diameter of the product; this stacking design makes it possible to increase the temperature of the local stacking part by increasing the winding density of the primary coil 2 while keeping the overall outer diameter of the product unchanged, wherein the temperature of the local stacking part rises after the short-circuit operation of the annular transformer, thereby becoming the highest temperature point; then the fuse is installed on the periphery of the local stacking part, i.e., the outermost overlapping layer, and the two leads 30 of the fuse body 3 are respectively connected to the wire head end 201 and the wire tail end 202 of the primary coil 2, and are used to connect the power input, so that the fuse body 3 effectively transmits the temperature signal of the highest temperature point to the inside of the fuse body 3 through the two pins. Therefore, when the circuit connected to the transformer is short-circuited, the working temperature of the local stacking part in the transformer first reaches the preset control temperature of the fuse body 3, and the fuse body 3 can be quickly melted, so that the input power can be cut off to avoid burning of the transformer. The automatic disconnection function of the circuit is realized, thereby protecting the toroidal transformer from short circuit overheating damage. In order to further ensure the close contact and effective heat transfer between the fuse and the primary coil 2, so as to improve the temperature sensing speed of the fuse body 3, the secondary coil 4 is wound after the fuse is installed to ensure that the secondary coil 4 can be evenly distributed around the primary coil 2 and the fuse.
[0039] In summary, the present application flexibly adjusts the installation position and installation method of the primary coil 2, the fuse body 3 and the secondary coil 4 on the annular core 1, solves the problem that the current annular transformer is easily burned due to the slow temperature sensing speed of the fuse, and improves the safety of the annular transformer.
[0040] To further illustrate, the primary coil 2 includes a first overlapping layer 22;
[0041] The first winding layer 21 is wound on the periphery of the annular core 1 , and the first overlapping layer 22 is wound on the periphery of the first winding layer 21 .
[0042] To further illustrate, the winding area of the first winding layer 21 is equal to the annular area of the annular core 1 , and the overlapping area of the first winding layer 21 and the first overlapping layer 22 is three tenths of the annular area of the annular core 1 .
[0043] To further illustrate, the primary coil 2 includes a first overlapping layer 22 and a second overlapping layer 23;
[0044] The first winding layer 21 is wound on the periphery of the annular core 1 , the first overlapping layer 22 is wound on the periphery of the first winding layer 21 , and the second overlapping layer 23 is wound on the periphery of the first overlapping layer 22 .
[0045] To further illustrate, the winding area of the first winding layer 21 and the winding area of the first overlapping layer 22 are equal to the annular area of the annular core 1 , and the overlapping area of the first overlapping layer 22 and the second overlapping layer 23 is three tenths of the annular area of the annular core 1 .
[0046] This application provides two embodiments. Figure 2 and Figure 4 Corresponding to different ways of evenly winding the primary coil 2 around the annular core 11.3 times and 2.3 times respectively; by changing the number of turns of the primary coil 2, flexible adjustment of the electromagnetic performance of the entire toroidal transformer is achieved; these two embodiments can be selected according to actual needs to meet the requirements for the performance of the toroidal transformer in different application scenarios, thereby optimizing the overall working effect of the toroidal transformer.
[0047] To further explain, the two leads 30 are distributed in a straight line on the periphery of the outermost overlapping layer 20, and the lead end 201 and the tail end 202 are respectively distributed at the starting end and the ending end of the outermost overlapping layer 20, and the two leads 30 are respectively connected to the lead end 201 and the tail end 202.
[0048] Since the fuse senses temperature mainly through two pins and transmits it to the inside of the fuse body 3 to heat and melt, when the temperature of the transformer reaches the control temperature of the fuse, it will automatically disconnect to protect the transformer.
[0049] The present application carefully designs the distribution of the fuse and the primary coil 2, aiming to achieve that when the fuse is installed, the fuse is fully unfolded, and the two pins can be directly connected to the wire head end 201 and the wire tail end 202 of the primary coil 2, which can quickly sense the temperature without the need for a bending operation, thereby simplifying the installation steps and reducing the complexity and cost of the production process.
[0050] To further illustrate, the secondary coil winding layer includes a third overlapping layer 41 and a fourth overlapping layer 42;
[0051] The third overlapping layer 41 is wound around the outer periphery of the overlapping layer 20 arranged as the outermost layer, and the fourth overlapping layer 42 is wound around the outer periphery of the third overlapping layer 41 .
[0052] To further illustrate, the winding area of the third overlapping layer 41 and the winding area of the fourth overlapping layer 42 are equal to the annular area of the annular core 1 .
[0053] Specifically, the secondary coil winding layer includes a third overlapping layer 41 and a fourth overlapping layer 42 wound twice, so that the secondary coil 4 can be evenly distributed on the primary coil 2, the fuse body 3 and the two leads 30, which can promote the fuse body 3 to sense temperature quickly.
[0054] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementations of the present invention without creative work, and these equivalent variations or substitutions are all included in the scope defined by the claims of this application.
Claims
1. A toroidal transformer with high safety performance, characterized in that: It comprises a ring-shaped iron core (1), a primary coil (2), a fuse body (3) and a secondary coil (4); The primary coil (2) is evenly wound on the annular iron core (1) to form a primary coil winding layer, and the primary coil winding layer comprises a first winding layer (21) and at least one overlapping layer (20), the first winding layer (21) is wound on the periphery of the annular iron core (1), and at least one overlapping layer (20) is sequentially wound on the periphery of the first winding layer (21) and on the periphery of an adjacent overlapping layer (20); The primary coil (2) has a wire head end (201) and a wire tail end (202), and both the wire head end (201) and the wire tail end (202) are exposed outside the primary coil winding layer; The fuse body (3) is mounted on the periphery of the outermost overlapping layer (20), and two leads (30) are provided on the fuse body (3), and the two leads (30) are respectively connected to the wire head end (201) and the wire tail end (202); The secondary coil (4) is evenly wound around the primary coil winding layer and the periphery of the fuse body (3) to form a secondary coil winding layer.
2. A toroidal transformer with high safety performance according to claim 1, characterized in that: The primary coil winding layer comprises a first winding layer (21) and a first overlapping layer (22); The first winding layer (21) is wound on the periphery of the annular core (1), and the first overlapping layer (22) is wound on the periphery of the first winding layer (21).
3. A toroidal transformer with high safety performance according to claim 2, characterized in that: The winding area of the first winding layer (21) is equal to the annular area of the annular core (1), and the overlapping area of the first winding layer (21) and the first overlapping layer (22) is three tenths of the annular area of the annular core (1).
4. A toroidal transformer with high safety performance according to claim 1, characterized in that: The primary coil winding layer comprises a first winding layer (21), a first overlapping layer (22) and a second overlapping layer (23); The first winding layer (21) is wound on the periphery of the annular core (1), the first overlapping layer (22) is wound on the periphery of the first winding layer (21), and the second overlapping layer (23) is wound on the periphery of the first overlapping layer (22).
5. A toroidal transformer with high safety performance according to claim 4, characterized in that: The winding area of the first winding layer (21) and the winding area of the first overlapping layer (22) are equal to the annular area of the annular core (1), and the overlapping area of the first overlapping layer (22) and the second overlapping layer (23) is three tenths of the annular area of the annular core (1).
6. A toroidal transformer with high safety performance according to claim 3 or 5, characterized in that: The two leads (30) are distributed in a straight line on the periphery of the outermost overlapping layer (20), and the lead end (201) and the lead tail end (202) are respectively distributed at the starting end and the ending end of the outermost overlapping layer (20), and the two leads (30) are respectively connected to the lead end (201) and the lead tail end (202).
7. A toroidal transformer with high safety performance according to claim 1, characterized in that: The secondary coil winding layer comprises a third overlapping layer (41) and a fourth overlapping layer (42); The third overlapping layer (41) is wound on the periphery of the overlapping layer (20) arranged as the outermost layer, and the fourth overlapping layer (42) is wound on the periphery of the third overlapping layer (41).
8. A toroidal transformer with high safety performance according to claim 7, characterized in that: The winding area of the third overlapping layer (41) and the winding area of the fourth overlapping layer (42) are equal to the annular area of the annular core (1).