CN217061715U

CN217061715U - Iron core, single-phase transformer and electric power system

Info

Publication number: CN217061715U
Application number: CN202123212898.3U
Authority: CN
Inventors: 李川; 李月明; 曹帅; 杜云龙; 刘少超
Original assignee: Shandong Jinshunyi Electronic Technology Co ltd
Current assignee: Shandong Jinshunyi Electronic Technology Co ltd
Priority date: 2021-12-20
Filing date: 2021-12-20
Publication date: 2022-07-26
Anticipated expiration: 2031-12-20

Abstract

The application provides an iron core, a single-phase transformer and an electric power system. The iron core comprises two main magnetic columns which are oppositely arranged and two auxiliary magnetic columns which are connected with the two main magnetic columns and are oppositely arranged; one main magnetic pole is used for sleeving the primary coil, the other main magnetic pole is used for sleeving the secondary coil, and the two main magnetic poles and the two auxiliary magnetic poles form a main magnetic window in a surrounding mode; and bending extension parts are formed on one sides of the two main magnetic columns far away from the main magnetic window, and the bending extension parts and the corresponding main magnetic columns surround to form an auxiliary magnetic window. The single-phase transformer comprises a primary coil, a secondary coil and the iron core, wherein the primary coil is sleeved on one main magnetic column, and the secondary coil is sleeved on the other main magnetic column. The magnetic leakage circuit magnetic resistance outside the primary coil and the secondary coil can be effectively reduced, so that a large leakage inductance effect can be obtained, and the transformer has high impedance characteristics.

Description

Iron core, single-phase transformer and electric power system

[ technical field ] A

The application relates to the technical field of transformers, in particular to an iron core, a single-phase transformer and an electric power system.

[ background of the invention ]

A transformer is a device for changing an ac voltage based on the principle of electromagnetic induction, and mainly includes a primary coil, a secondary coil, and an iron core (also called a magnetic core), and has functions of voltage stabilization (such as a magnetic saturation transformer), voltage conversion, current conversion, impedance conversion, isolation, and the like. Since the advent of transformers, transformers have been used as the basic equipment for power transmission and distribution, and have been widely used in the fields of industry, agriculture, transportation, urban communities, and the like.

In the related art, the current and the voltage passing through the transformer usually have higher harmonics, which brings many adverse effects to the transformer, such as abnormal noise, severe heat generation, and aggravated insulation aging, and in severe cases, the transformer is also burnt out. In order to reduce the damage of the higher harmonic to the transformer, technicians can connect an inductor and a capacitor in series at the front end of the transformer to reduce and filter the higher harmonic in a loop; however, the impedance of the transformer is nevertheless low. In addition, the existing transformer generally adopts a cylindrical coil, and the practical application still has many defects, such as poor heat dissipation performance, high cost, large volume and the like, so that the occupied space of the transformer is large, the transformer is inconvenient to arrange and the maintenance of the transformer is inconvenient.

Therefore, there is a need for an improved structure of the transformer.

[ Utility model ] content

The application provides an iron core, a single-phase transformer and an electric power system, and aims to solve the problem that the impedance of the transformer in the related technology is low.

In order to solve the above technical problem, a first aspect of the embodiments of the present application provides an iron core, including two main magnetic pillars that are arranged oppositely, and two auxiliary magnetic pillars that are connected to the two main magnetic pillars and arranged oppositely; the two main magnetic poles and the two auxiliary magnetic poles are enclosed to form a main magnetic window, bending extension parts are formed on one sides of the two main magnetic poles far away from the main magnetic window, and the bending extension parts and the corresponding main magnetic poles are enclosed to form auxiliary magnetic windows.

A second aspect of the embodiments of the present application provides a single-phase transformer, including a primary coil, a secondary coil, and a core as set forth in the first aspect of the embodiments of the present application; the primary coil is sleeved on one of the main magnetic columns, the secondary coil is sleeved on the other main magnetic column, and the primary coil and the secondary coil are spaced from each other.

A third aspect of embodiments of the present application provides an electrical power system, including a single-phase transformer as described in the second aspect of embodiments of the present application.

As can be seen from the above description, the present application has the following advantages compared with the related art:

and bending extension parts are formed on one sides of the two main magnetic poles far away from the main magnetic window, so that each bending extension part can surround the corresponding main magnetic pole to form an auxiliary magnetic window. Based on this, can locate a main magnetic pole with primary coil cover to and locate another main magnetic pole with secondary coil cover, and because the setting of two extension portions of buckling for the length of the air magnetic circuit in the primary coil and the secondary coil outside (keeping away from the one side of main magnetic window promptly) has all obtained shortening by a wide margin, thereby has reduced the magnetic resistance of leakage magnetic circuit in the primary coil and the secondary coil outside effectively, and then can obtain great leakage inductance effect, makes the transformer possess the high impedance characteristic.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions in the related art or the embodiments of the present application, the drawings needed to be used in the description of the related art or the embodiments of the present application will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, not all embodiments, and other drawings can be obtained by those skilled in the art without inventive efforts.

Fig. 1 is a schematic view of a first structure of a core according to an embodiment of the present disclosure;

fig. 2 is a schematic diagram of a second structure of a core according to an embodiment of the present disclosure;

fig. 3 is a schematic view of a third structure of a core according to an embodiment of the present application;

fig. 4 is a schematic diagram illustrating a fourth structure of a core according to an embodiment of the present application;

fig. 5 is a schematic view of a fifth structure of a core according to an embodiment of the present application;

fig. 6 is a schematic view of a sixth structure of a core according to an embodiment of the present application;

fig. 7 is a schematic view of a first structure of a single-phase transformer according to an embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of a second single-phase transformer according to an embodiment of the present application.

[ detailed description ] embodiments

In order to make the objects, technical solutions and advantages of the present application more apparent and understandable, the present application will be clearly and completely described below in conjunction with embodiments of the present application and corresponding drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. It should be understood that the embodiments of the present application described below are only used for explaining the present application and are not used for limiting the present application, that is, all other embodiments obtained by a person of ordinary skill in the art without making creative efforts based on the embodiments of the present application belong to the protection scope of the present application. In addition, the technical features involved in the embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.

In the related art, the current and the voltage passing through the transformer usually have higher harmonics, so that the transformer is caused with many adverse effects, such as abnormal noise, serious heating, aggravated insulation aging and the like, and the transformer is burnt in serious cases. In order to reduce the damage of higher harmonics to the transformer, technicians can connect an inductor and a capacitor in series at the front end of the transformer to reduce and filter the higher harmonics in a loop; however, the impedance of the transformer is nevertheless low. In addition, the existing transformer generally adopts a cylindrical coil, and the practical application still has many defects, such as poor heat dissipation performance, high cost, large volume and the like, so that the occupied space of the transformer is large, the transformer is inconvenient to arrange and the maintenance of the transformer is inconvenient. To this end, embodiments of the present application provide an iron core, which may be applied to various transformers, such as a single-phase transformer, etc.; the single-phase transformer can be applied to various power systems, but is not limited thereto.

Referring to fig. 1, fig. 1 is a schematic view illustrating a first structure of an iron core according to an embodiment of the present disclosure; as can be seen from fig. 1, the iron core provided by the embodiment of the present application includes two main magnetic columns 1 disposed oppositely, and two auxiliary magnetic columns 2 disposed oppositely and connecting the two main magnetic columns 1; wherein, a main magnetic pole 1 is used for the cover to establish primary coil, and another main magnetic pole 1 is used for the cover to establish secondary coil, and two main magnetic poles 1 and two vice magnetic poles 2 enclose and form main magnetic window 4. Furthermore, bending extension parts 3 are formed on one sides of the two main magnetic columns 1 far away from the main magnetic window 4, and the bending extension parts 3 and the corresponding main magnetic columns 1 enclose to form an auxiliary magnetic window 5. It will be appreciated that since the primary magnetic post 1 comprises two, the meander extension 3 comprises two, as well as the secondary magnetic window 5.

In the embodiment of the application, the bending extension parts 3 are formed on one sides of the two main magnetic columns 1 far away from the main magnetic window 4, so that each bending extension part 3 can enclose with the corresponding main magnetic column 1 to form the auxiliary magnetic window 5. Based on this, can locate a main magnetic pole 1 with the primary coil cover to and locate another main magnetic pole 1 with the secondary coil cover, and because the setting of two extension portions of buckling 3 for the length of the air magnetic circuit in the primary coil and the secondary coil outside (keeping away from the one side of main magnetic window 4 promptly) has all obtained shortening by a wide margin, thereby has reduced the magnetic resistance of magnetic leakage way in the primary coil and the secondary coil outside effectively, and then can obtain great leakage inductance effect, makes the transformer possess the high impedance characteristic.

As an embodiment, still referring to fig. 1, the bending extension portion 3 may include a first extension portion 31 extending from a connection point of the corresponding main magnetic pole 1 and one of the sub magnetic poles 2 in a direction away from the main magnetic window 4, a second extension portion 32 extending from a connection point of the corresponding main magnetic pole 1 and the other sub magnetic pole 2 in a direction away from the main magnetic window 4, and a connection portion 33 connecting the first extension portion 31 and the second extension portion 32; the first extension portion 31, the second extension portion 32, and the connection portion 33 enclose the corresponding main magnetic column 1 to form the auxiliary magnetic window 5.

In practical application, when the transformer is produced, the thickness of the connecting part 33, namely the size of the cross section area of the connecting part 33, can be adjusted according to the requirement of a user on leakage inductance; when the thickness of the connection portion 33 is different, the leakage inductance of the transformer to be produced is different.

As another embodiment, please further refer to fig. 2, wherein fig. 2 is a schematic diagram of a second structure of an iron core according to an embodiment of the present application; as can be seen from fig. 2, the bent extension 3 may include a first extension 31 extending from a connection point of the corresponding main magnetic pole 1 and one of the sub magnetic poles 2 in a direction away from the main magnetic window 4, a second extension 32 extending from a connection point of the corresponding main magnetic pole 1 and the other sub magnetic pole 2 in a direction away from the main magnetic window 4, a first connection portion 33 extending from the first extension 31 in a direction of the second extension 32, and a second connection portion 34 extending from the second extension 32 in a direction of the first extension 31 and corresponding to the first connection portion 33; the first extension portion 31, the second extension portion 32, the first connection portion 33, the second connection portion 34 and the corresponding main magnetic pillar 1 enclose to form the auxiliary magnetic window 5, and the first connection portion 33 and the second connection portion 34 are spaced from each other to form an air gap 6 communicating the corresponding auxiliary magnetic window 5 with an external space.

In practical application, the size of the air gap 6 can be adjusted according to the requirement of a user on leakage inductance during the production of the transformer; when the air gaps 6 are different in size, the leakage inductance of the produced transformer is different. Of course, the thickness of the first connecting portion 33 and/or the second connecting portion 34, that is, the size of the cross-sectional area of the first connecting portion 33 and/or the second connecting portion 34, may be adjusted in other embodiments; when the first connection portion 33 and/or the second connection portion 34 have different thicknesses, the leakage inductance of the transformer to be produced is different.

As a specific implementation of the present embodiment, please further refer to fig. 3, where fig. 3 is a schematic diagram of a third structure of an iron core provided in an embodiment of the present application; as can be seen from fig. 3, the bending extension 3 may further include a plurality of filling members 35 besides the first extension 31, the second extension 32, the first connection portion 33 and the second connection portion 34, the thickness of each filling member 35 is different, and the thickness of each filling member 35 is smaller than the width of the air gap 6 in the direction in which one secondary magnetic pillar 2 points to the other secondary magnetic pillar 2; wherein, the filling member 35 is used for being arranged in the air gap 6 to change the size of the air gap 6 by filling the air gap 6.

Specifically, when the filler 35 is not provided in the air gap 6, the air gap 6 is maximized; the air gap 6 is minimal (corresponding to the absence of the air gap 6) when the filler 35 is disposed within the air gap 6 and the filler 35 is disposed to completely seal the air gap 6. It follows that the number of the filler pieces 35 provided in the air gap 6 is inversely related to the size of the air gap 6.

It can be understood that the specific implementation does not need to adjust the size of the air gap 6 in the process of producing the transformer, but adjusts the size of the air gap 6 at any time in a manner that the filling members 35 with different thicknesses are arranged in the air gap 6 after the transformer is produced and put into use, so as to adjust the leakage inductance.

As another specific implementation of the present embodiment, please further refer to fig. 4, where fig. 4 is a schematic diagram of a fourth structure of the iron core provided in the embodiment of the present application; as can be seen from fig. 4, the bending and extending portion 3 may further include, in addition to the first extending portion 31, the second extending portion 32, the first connecting portion 33 and the second connecting portion 34, a first sliding member 36 embedded at a side of the first connecting portion 33 close to the main magnetic window 4 and slidably engaged with the first connecting portion 33, and a second sliding member 37 embedded at a side of the second connecting portion 34 close to the main magnetic window 4 and slidably engaged with the second connecting portion 34; wherein, the first sliding piece 36 and the second sliding piece 37 slide in a reciprocating way in the direction that one sub magnetic column 2 points to the other sub magnetic column 2, so as to change the size of the air gap 6 by shielding the air gap 6. Here, it should be noted that the first sliding member 36 is not limited to be disposed on the side of the first connecting portion 33 close to the main magnetic window 4, and may be disposed on the side of the first connecting portion 33 far from the main magnetic window 4, or the second sliding member 37; further, it is not necessary to fit the sliders in both the first connecting portion 33 and the second connecting portion 34, and the first slider 36 may be fitted only in the first connecting portion 33 or the second slider 37 may be fitted only in the second connecting portion 34.

Specifically, the way of reducing the air gap 6 includes: the first slider 36 is stationary and the second slider 37 slides in the direction of the first slider 36 to block part/all of the air gap 6; or, the second sliding member 37 is stationary, and the first sliding member 36 slides in the direction of the second sliding member 37 to block part/all of the air gap 6; alternatively, the second slider 37 slides in the direction of the first slider 36, and the first slider 36 simultaneously slides in the direction of the second slider 37 to block part/all of the air gap 6. The way to increase the air gap 6 includes: the first sliding part 36 is static, and the second sliding part 37 slides away from the first sliding part 36 to reduce the shielding area of the air gap 6; or, the second sliding part 37 is stationary, and the first sliding part 36 slides away from the second sliding part 37 to reduce the shielding area of the air gap 6; or, the second sliding member 37 slides in a direction away from the first sliding member 36, and the first sliding member 36 simultaneously slides in a direction away from the second sliding member 37, so as to reduce the shielding area of the air gap 6.

It can be understood that, in this specific implementation, the size of the air gap 6 is no longer required to be adjusted in the process of producing the transformer, but after the transformer is produced and put into use, the size of the air gap 6 is adjusted at any time by sliding the first sliding part 36 and/or the second sliding part 37 to increase/decrease the shielding area of the air gap 6, so as to adjust the leakage inductance.

As another embodiment, please further refer to fig. 5, fig. 5 is a schematic diagram illustrating a fifth structure of an iron core according to an embodiment of the present application; as can be seen from fig. 5, the bent extension 3 may include a first extension 31 extending from a connection point of the corresponding main magnetic pole 1 and one of the sub magnetic poles 2 in a direction away from the main magnetic window 4, a second extension 32 extending from a connection point of the corresponding main magnetic pole 1 and the other sub magnetic pole 2 in a direction away from the main magnetic window 4, a first connection portion 33 extending from the first extension 31 in a direction of the second extension 32, and a second connection portion 34 extending from the second extension 32 in a direction of the first extension 31 and corresponding to the first connection portion 33; the first extension portion 31, the second extension portion 32, the first connection portion 33, the second connection portion 34 and the corresponding main magnetic pillar 1 enclose to form the auxiliary magnetic window 5, and the first connection portion 33 and the second connection portion 34 are spaced from each other to form an air gap 6 communicating the corresponding auxiliary magnetic window 5 with an external space.

Further, the first connecting portion 33 is inserted in the first extending portion 31 and is in sliding fit with the first extending portion 31, the second connecting portion 34 is inserted in the second extending portion 32 and is in sliding fit with the second extending portion 32, and the first connecting portion 33 and the second connecting portion 34 both slide in a reciprocating manner in a direction in which one of the sub-magnetic columns 2 points to the other sub-magnetic column 2, so as to change the size of the air gap 6 by increasing/decreasing the relative distance between the first connecting portion 33 and the second connecting portion 34. Here, it should be noted that it is not necessary that both the first connecting portion 33 and the second connecting portion 34 have the sliding function, and only the first connecting portion 33 may have the sliding function and the second connecting portion 34 may be fixed, or only the second connecting portion 34 may have the sliding function and the first connecting portion 33 may be fixed.

Specifically, the way of reducing the air gap 6 includes: the first connecting part 33 is static, and the second connecting part 34 slides towards the first connecting part 33, so as to shorten the relative distance between the first connecting part 33 and the second connecting part 34; or, the second connecting portion 34 is stationary, and the first connecting portion 33 slides towards the second connecting portion 34, so as to shorten the relative distance between the first connecting portion 33 and the second connecting portion 34; or, the second connecting portion 34 slides toward the first connecting portion 33, and the first connecting portion 33 simultaneously slides toward the second connecting portion 34, so as to shorten the relative distance between the first connecting portion 33 and the second connecting portion 34. The way to increase the air gap 6 includes: the first connecting portion 33 is stationary, and the second connecting portion 34 slides in a direction away from the first connecting portion 33, so as to increase the relative distance between the first connecting portion 33 and the second connecting portion 34; or, the second connecting portion 34 is stationary, and the first connecting portion 33 slides in a direction away from the second connecting portion 34, so as to increase the relative distance between the first connecting portion 33 and the second connecting portion 34; or, the second connecting portion 34 slides in a direction away from the first connecting portion 33, and the first connecting portion 33 simultaneously slides in a direction away from the second connecting portion 34, so as to increase the relative distance between the first connecting portion 33 and the second connecting portion 34.

It can be understood that in the present embodiment, the size of the air gap 6 does not need to be adjusted in the process of producing the transformer, but after the transformer is produced and put into use, the size of the air gap 6 is adjusted at any time by sliding the first connecting portion 33 and/or the second connecting portion 34 to increase/decrease the relative distance between the first connecting portion 33 and the second connecting portion 34, so as to adjust the leakage inductance.

As another embodiment, please further refer to fig. 6, wherein fig. 6 is a schematic diagram illustrating a sixth structure of an iron core according to an embodiment of the present application; as can be seen from fig. 6, the bent extension 3 may include a first extension 31 extending from a connection point of the corresponding main magnetic pole 1 and one of the sub magnetic poles 2 in a direction away from the main magnetic window 4, a second extension 32 extending from a connection point of the corresponding main magnetic pole 1 and the other sub magnetic pole 2 in a direction away from the main magnetic window 4, a first connection portion 33 extending from the first extension 31 in a direction of the second extension 32, and a second connection portion 34 extending from the second extension 32 in a direction of the first extension 31 and corresponding to the first connection portion 33; the first extension portion 31, the second extension portion 32, the first connection portion 33, the second connection portion 34 and the corresponding main magnetic column 1 are enclosed to form the auxiliary magnetic window 5, and the first connection portion 33 and the second connection portion 34 are spaced from each other to form an air gap 6 communicating the corresponding auxiliary magnetic window 5 with an external space.

Further, the first connection portion 33 and the second connection portion 34 each include multiple segments that are telescopically arranged, and the first connection portion 33 and the second connection portion 34 each reciprocally extend and contract in a direction in which one of the sub-magnetic columns 2 points to the other sub-magnetic column 2, so as to change the size of the air gap 6 in a manner of increasing/decreasing a relative distance between the first connection portion 33 and the second connection portion 34. Here, it should be noted that, it is not necessary to provide both the first connecting portion 33 and the second connecting portion 34 with the telescopic function, only the first connecting portion 33 may be provided with the telescopic function, and the second connecting portion 34 may not have the telescopic function (i.e., include one segment, but not include multiple segments of the telescopic device), or only the second connecting portion 34 may be provided with the telescopic function, and the first connecting portion 33 may not have the telescopic function.

Specifically, the way of reducing the air gap 6 includes: the first connecting portion 33 is stationary, and the second connecting portion 34 is extended toward the first connecting portion 33 to shorten the relative distance between the first connecting portion 33 and the second connecting portion 34; or, the second connecting portion 34 is stationary, and the first connecting portion 33 is extended toward the second connecting portion 34 to shorten the relative distance between the first connecting portion 33 and the second connecting portion 34; alternatively, the second connecting portion 34 is extended toward the first connecting portion 33, and the first connecting portion 33 is simultaneously extended toward the second connecting portion 34, so as to shorten the relative distance between the first connecting portion 33 and the second connecting portion 34. The way of increasing the air gap 6 includes: the first connecting portion 33 is stationary, and the second connecting portion 34 is shortened in a direction away from the first connecting portion 33, so as to increase the relative distance between the first connecting portion 33 and the second connecting portion 34; or, the second connecting portion 34 is stationary, and the first connecting portion 33 is shortened in a direction away from the second connecting portion 34, so as to increase the relative distance between the first connecting portion 33 and the second connecting portion 34; or, the second connecting portion 34 is shortened in a direction away from the first connecting portion 33, and the first connecting portion 33 is shortened in a direction away from the second connecting portion 34 at the same time, so as to increase the relative distance between the first connecting portion 33 and the second connecting portion 34.

It can be understood that, in this embodiment, the size of the air gap 6 does not need to be adjusted in the process of producing the transformer, but after the transformer is produced and put into use, the size of the air gap 6 is adjusted at any time by extending and contracting the first connecting portion 33 and/or the second connecting portion 34 to increase/decrease the relative distance between the first connecting portion 33 and the second connecting portion 34, so as to adjust the leakage inductance.

It should be understood that the above-mentioned embodiments are only preferred implementations of the embodiments of the present application, and are not the only limitations on the specific configuration of the bending extension 3 in the embodiments of the present application; in this regard, a person skilled in the art can flexibly set the setting according to the actual application scenario on the basis of the embodiment of the present application.

Referring to fig. 7, fig. 7 is a schematic view of a first structure of a single-phase transformer according to an embodiment of the present disclosure, that is, a single-phase transformer is further provided according to an embodiment of the present disclosure; as can be seen from fig. 7, the single-phase transformer includes a primary coil 7, a secondary coil 8, and a core provided in the embodiment of the present application; wherein, the primary coil 7 is sleeved on one main magnetic column 1, the secondary coil 8 is sleeved on the other main magnetic column 1, and the primary coil 7 and the secondary coil 8 are spaced from each other.

As an embodiment, please further refer to fig. 8, wherein fig. 8 is a schematic diagram of a second structure of a single-phase transformer according to an embodiment of the present application; as can be seen from fig. 8, the primary coil 7 may include a plurality of primary pancake coils 71 spaced apart from each other, and the secondary coil 8 may include a plurality of secondary pancake coils 81 spaced apart from each other and equal in number to the primary pancake coils 71; the plurality of primary pancake coils 71 correspond to the plurality of secondary pancake coils 81 one by one, and one primary pancake coil 71 and one corresponding secondary pancake coil 81 form one coil pair.

Furthermore, magnetic leakage sheets 9 are arranged between any two adjacent coil pairs, and between the coil pair close to the auxiliary magnetic pole 2 and the corresponding auxiliary magnetic pole 2, and each magnetic leakage sheet 9 is positioned in the main magnetic window 4; wherein, the quantity of magnetic leakage piece 9 is one more than the quantity of coil pair, and is located the relative both sides of magnetic leakage piece 9 between arbitrary two adjacent coil pairs and need respectively the butt in two corresponding coil pairs, is located the coil pair that is close to vice magnetic column 2 and the relative both sides of magnetic leakage piece 9 between the corresponding vice magnetic column 2 and need respectively the butt in corresponding coil pair and vice magnetic column 2.

In this embodiment, the primary coil 7 and the secondary coil 8 both adopt pancake coils with leakage inductance effect, and are matched with the arranged leakage magnetic sheets 9, so that the magnetic resistance of a leakage magnetic path in the main magnetic window 4 can be effectively reduced, the leakage inductance of the transformer is further improved, and the transformer has more excellent high impedance characteristics. Moreover, compared with a barrel-type coil, the pancake-type coil has good ventilation and heat dissipation performance, and the used materials are less, so that the cost optimization and the leakage inductance enhancement of the transformer are both played a vital role. In addition, if the heat dissipation performance of the surface of the iron core is still not ideal, silicon steel with poor silicon steel grade can be selected.

It should be noted that, in the present disclosure, each embodiment is described in a progressive manner, and each embodiment focuses on differences from other embodiments, and portions that are the same as and similar to each other in each embodiment may be referred to.

It should also be noted that, in the present application, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An iron core comprises two main magnetic columns which are oppositely arranged, and two auxiliary magnetic columns which are connected with the two main magnetic columns and are oppositely arranged; one main magnetic pole is used for sleeving the primary coil, the other main magnetic pole is used for sleeving the secondary coil, and the two main magnetic poles and the two auxiliary magnetic poles form a main magnetic window in a surrounding mode; the magnetic pole is characterized in that bending extension parts are formed on one sides of the two main magnetic poles far away from the main magnetic window, and the bending extension parts and the corresponding main magnetic poles surround to form an auxiliary magnetic window.

2. The iron core of claim 1, wherein the bent extension portion comprises a first extension portion extending from a connection point of the corresponding main pole and one of the auxiliary poles in a direction away from the main pole window, a second extension portion extending from a connection point of the corresponding main pole and the other of the auxiliary poles in a direction away from the main pole window, and a connection portion connecting the first extension portion and the second extension portion; the first extension part, the second extension part, the connecting part and the corresponding main magnetic pole are encircled to form the auxiliary magnetic window.

3. The iron core according to claim 1, wherein the bending extension portion comprises a first extension portion extending from a connection point of the corresponding main pillar and one of the auxiliary pillars in a direction away from the main magnetic window, a second extension portion extending from a connection point of the corresponding main pillar and the other of the auxiliary pillars in a direction away from the main magnetic window, a first connection portion extending from the first extension portion in a direction of the second extension portion, and a second connection portion extending from the second extension portion in a direction of the first extension portion and corresponding to the first connection portion; the first extension part, the second extension part, the first connection part, the second connection part and the corresponding main magnetic column are encircled to form the auxiliary magnetic window, and the first connection part and the second connection part are mutually spaced to form an air gap for communicating the corresponding auxiliary magnetic window and an external space.

4. The iron core of claim 3, wherein the bent extension further comprises a plurality of filler members, each of the filler members having a different thickness, each of the filler members having a thickness less than a width of the air gap in a direction in which one of the secondary legs points toward the other of the secondary legs; the filling piece is arranged in the air gap and used for changing the size of the air gap in a filling mode.

5. The iron core according to claim 3, wherein the bending extension portion further comprises a first sliding member embedded in one side of the first connecting portion adjacent to the main magnetic window and slidably engaged with the first connecting portion, and a second sliding member embedded in one side of the second connecting portion adjacent to the main magnetic window and slidably engaged with the second connecting portion; the first sliding piece and the second sliding piece are used for sliding in a reciprocating mode in the direction that one auxiliary magnetic column points to the other auxiliary magnetic column, so that the size of the air gap is changed in a mode of shielding the air gap.

6. The iron core according to claim 1, wherein the bent extensions include a first extension extending from a connection point of the corresponding main pole and one of the sub-poles in a direction away from the main pole window, a second extension extending from a connection point of the corresponding main pole and the other sub-pole in a direction away from the main pole window, a first connection extending from the first extension in a direction of the second extension, and a second connection extending from the second extension in a direction of the first extension and corresponding to the first connection; the first extension part, the second extension part, the first connection part, the second connection part and the corresponding main magnetic column are encircled to form the auxiliary magnetic window, and the first connection part and the second connection part are mutually spaced to form an air gap for communicating the corresponding auxiliary magnetic window and an external space; the first connecting portion is inserted in the first extending portion and is in sliding fit with the first extending portion, the second connecting portion is inserted in the second extending portion and is in sliding fit with the second extending portion, and the first connecting portion and the second connecting portion are both used for sliding in a reciprocating mode in the direction that one auxiliary magnetic column points to the other auxiliary magnetic column, so that the size of the air gap is changed in a mode of increasing/shortening the relative distance between the first connecting portion and the second connecting portion.

7. The iron core according to claim 1, wherein the bent extensions include a first extension extending from a connection point of the corresponding main pole and one of the sub-poles in a direction away from the main pole window, a second extension extending from a connection point of the corresponding main pole and the other sub-pole in a direction away from the main pole window, a first connection extending from the first extension in a direction of the second extension, and a second connection extending from the second extension in a direction of the first extension and corresponding to the first connection; the first extension part, the second extension part, the first connection part, the second connection part and the corresponding main magnetic column are encircled to form the auxiliary magnetic window, and the first connection part and the second connection part are mutually spaced to form an air gap for communicating the corresponding auxiliary magnetic window and an external space; first connecting portion with the second connecting portion all include the multistage of flexible setting, just first connecting portion with the second connecting portion all are used for one vice magnetic pillar points to another reciprocal flexible in the direction of vice magnetic pillar, in order through right first connecting portion with the relative distance between the second connecting portion increases/shortens the mode, changes the size of air gap.

8. A single-phase transformer includes a primary coil and a secondary coil; -wherein the single-phase transformer further comprises a core according to any of claims 1 to 7; the primary coil is sleeved on one of the main magnetic columns, the secondary coil is sleeved on the other main magnetic column, and the primary coil and the secondary coil are spaced from each other.

9. The single-phase transformer of claim 8, wherein the primary coil comprises a plurality of primary pancake coils spaced apart from each other, the secondary coil comprises a plurality of secondary pancake coils spaced apart from each other and equal in number to the primary pancake coils, the plurality of primary pancake coils are in one-to-one correspondence with the plurality of secondary pancake coils, and one primary pancake coil and a corresponding one of the secondary pancake coils form one coil pair; and magnetic leakage sheets are arranged between any two adjacent coil pairs and between the coil pair close to the auxiliary magnetic column and the corresponding auxiliary magnetic column, and each magnetic leakage sheet is positioned in the main magnetic window.

10. An electric power system, characterized by comprising a single-phase transformer according to claim 8 or 9.