阅读说明：本技术 一种电抗器 (Electric reactor ) 是由 刘磊 郑力 张翔 曹冬明 方太勋 黄华 于 2020-04-26 设计创作，主要内容包括：本公开涉及一种电抗器。电抗器包括：水冷线圈；多个铁芯,套设在水冷线圈上；热管,分别连接水冷线圈的导体管和至少一个铁芯,热管用于将至少一个铁芯的热量传递至导体管；壳体,设置于铁芯的外侧；填充材料,用于填充壳体内的空腔。本公开的电抗器将热管用于铁芯热量的传递,提高铁芯散热效率,且热管将铁芯和水冷线圈等电位连接。(The present disclosure relates to a reactor. The reactor includes: a water-cooled coil; the plurality of iron cores are sleeved on the water-cooling coil; the heat pipe is respectively connected with the conductor pipe of the water-cooling coil and the at least one iron core and is used for transferring the heat of the at least one iron core to the conductor pipe; the shell is arranged on the outer side of the iron core; and the filling material is used for filling the cavity in the shell. The reactor disclosed by the invention has the advantages that the heat pipe is used for transferring the heat of the iron core, the heat dissipation efficiency of the iron core is improved, and the iron core and the water-cooling coil are connected in an equipotential manner by the heat pipe.)

1. A reactor, characterized by comprising:

the water-cooling coil is of a spiral structure and comprises a hollow conductor pipe and an insulating layer wrapping the conductor pipe;

the plurality of iron cores are sleeved on the water-cooling coil;

the heat pipe is respectively connected with the conductor pipe of the water-cooling coil and the at least one iron core and is used for transferring the heat of the at least one iron core to the conductor pipe;

the shell is arranged on the outer side of the iron core;

and the filling material is used for filling the cavity in the shell.

2. The reactor according to claim 1, wherein the iron core is a CD-shaped iron core, and comprises two sub-iron cores and an anchor ear, and the two sub-iron cores are connected through the anchor ear.

3. The reactor according to claim 2, characterized in that the heat absorbing portion of the heat pipe is pressed against the surface of the core by the anchor ear.

4. The reactor according to claim 3, wherein a first interlayer is provided between the heat pipe and the core, and the first interlayer is made of an electrically and thermally conductive material.

5. The reactor according to claim 1, characterized in that the cooling portion of the heat pipe is pressed against the surface of the conductor pipe by a pressing piece.

6. The reactor according to claim 5, wherein a second spacer layer is provided between the heat pipe and the conductor pipe, and the second spacer layer is made of an electrically and thermally conductive material.

7. The reactor according to claim 1, characterized in that a heat absorbing portion of the heat pipe connects all the cores in sequence.

8. The reactor according to claim 7, characterized in that a connection point of the heat pipe and the conductor pipe is located at an intermediate layer of the spiral structure of the water-cooled coil or at a midpoint of the water-cooled coil.

9. The reactor according to claim 1, characterized in that the number of the heat pipes is plural, and the plural heat pipes connect the conductor pipe and at least one of the cores, respectively.

10. The reactor according to claim 9, wherein one end of the heat pipe is connected to the conductor pipe, and the other end of the heat pipe extends along a surface of the core.

Technical Field

The present disclosure relates to the field of power electronics, and in particular, to a reactor.

Background

The reactor plays a role in protecting the thyristor in the high-voltage direct-current converter valve, the iron core and the coil are main components in the reactor, and two ends of the coil are connected with the silicon stack of the converter valve.

The iron core and the coil of the reactor can generate a large amount of heat in the operation process, the heat of the coil is usually taken away by circulating cooling water in a water cooling pipeline, and the coil is high in heat dissipation efficiency and small in temperature rise. Insulating materials with certain thickness exist between the iron core and the water-cooling coil, and the water-cooling coil cannot be utilized for efficient heat dissipation, so that a large part of heat generated by the iron core is dissipated through the shell, the heat dissipation efficiency is low, and the temperature is increased. The iron core temperature is too high, and the performance of the insulating material in the valve reactor can be influenced, and the valve reactor can be caused to lose efficacy under severe conditions, so that the safe operation of the converter valve is threatened. In order to prolong the service life of the converter valve and reduce the failure rate, strict requirements on the temperature rise of devices inside the reactor and the surface temperature rise must be provided. In order to reduce the temperature of an iron core when the reactor operates, the prior art adopts the following schemes:

1. the heat transfer coefficient on the heat dissipation path of the iron core is improved by means of improving filling materials, optimizing the structure and the like.

2. And a water-cooling heat dissipation pipeline aiming at the iron core is added, so that the heat of the iron core is directly taken away by cooling water.

However, the above technical solutions all have certain disadvantages, and the improvement of the scheme 1 on the heat dissipation condition of the iron core is limited. The structural optimization generally causes the reactor to be bulky, and some structural changes may reduce the mechanical strength of the reactor. Scheme 2 introduces the special heat dissipation pipeline of iron core, but can bring the risk of water pipe seepage and jam, leads to the converter valve to shut down.

Disclosure of Invention

The present disclosure is directed to a reactor, which overcomes the problem of low heat dissipation efficiency of an iron core of an existing reactor.

One embodiment of the present disclosure provides a reactor including: the water-cooling coil is of a spiral structure and comprises a hollow conductor pipe and an insulating layer wrapping the conductor pipe; the plurality of iron cores are sleeved on the water-cooling coil; the heat pipe is respectively connected with the conductor pipe of the water-cooling coil and the at least one iron core and is used for transferring the heat of the at least one iron core to the conductor pipe; the shell is arranged on the outer side of the iron core; and the filling material is used for filling the cavity in the shell.

According to some embodiments of the present disclosure, the iron core is a CD-shaped iron core, and includes two sub-iron cores and an anchor ear, and the two sub-iron cores are connected through the anchor ear.

According to some embodiments of the present disclosure, the heat absorbing portion of the heat pipe is pressed against the surface of the iron core by the hoop.

According to some embodiments of the present disclosure, a first interlayer is disposed between the heat pipe and the iron core, and the first interlayer is made of an electrically and thermally conductive material.

According to some embodiments of the present disclosure, the cooling portion of the heat pipe is pressed against the surface of the conductor pipe by a pressing sheet.

According to some embodiments of the present disclosure, a second interlayer is disposed between the heat pipe and the conductor pipe, and the second interlayer is made of an electrically and thermally conductive material.

According to some embodiments of the present disclosure, the heat absorbing portion of the heat pipe is connected to all of the cores in sequence.

According to some embodiments of the disclosure, the connection of the heat pipe and the conductor pipe is located at an intermediate layer of the spiral structure of the water-cooled coil or at a midpoint of the water-cooled coil.

According to some embodiments of the present disclosure, the number of the heat pipes is plural, and the plural heat pipes are respectively connected to the conductor pipe and the at least one iron core.

According to some embodiments of the present disclosure, one end of the heat pipe is connected to the conductor pipe, and the other end of the heat pipe extends along a surface of the core.

According to the reactor, the heat of the iron core is transferred by the heat pipe, the rapid heat transfer property of the phase change medium is fully utilized, the heat can be rapidly transferred to the water cooling coil, the heat dissipation efficiency of the iron core is improved, the temperature of the iron core is reduced, and the reliable operation of the reactor is guaranteed. The heat pipe also serves as an equipotential line, the iron core and the water-cooling coil are connected in an equipotential mode, the occupied space inside the reactor is small, and the practicability is high.

Drawings

Fig. 1 is a schematic diagram of a reactor according to an embodiment of the present disclosure.

FIG. 2 is a schematic diagram of a heat pipe connected to a water-cooled coil according to an embodiment of the disclosure;

FIG. 3 is a schematic diagram of a heat pipe connection core according to an embodiment of the disclosure;

FIG. 4 is a first schematic diagram of another arrangement of heat pipes according to an embodiment of the present disclosure;

FIG. 5 is a second schematic diagram of another arrangement of heat pipes according to the embodiment of the present disclosure.

Wherein the content of the first and second substances,

1. iron core, 11, sub-iron core, 12, anchor ear;

2. a water-cooling coil 21, a conductor pipe 22, an insulating layer 23 and cooling water;

3. a heat pipe;

4. a housing;

51. a first barrier layer, 52, a second barrier layer;

6. and (6) tabletting.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art can appreciate, the described embodiments can be modified in various different ways, without departing from the spirit or scope of the present disclosure. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

In the description of the present disclosure, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "straight", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered as limiting the present disclosure. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present disclosure, "a plurality" means two or more unless specifically limited otherwise.

Throughout the description of the present disclosure, it is to be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection, either mechanically, electrically, or otherwise in communication with one another; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or may comprise the first and second features being in contact, not directly, but via another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the disclosure. To simplify the disclosure of the present disclosure, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present disclosure. Moreover, the present disclosure may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

The preferred embodiments of the present disclosure will be described below with reference to the accompanying drawings, and it should be understood that the preferred embodiments described herein are merely for purposes of illustrating and explaining the present disclosure and are not intended to limit the present disclosure.

As shown in fig. 1, one embodiment of the present disclosure provides a reactor. The reactor includes: iron core 1, water-cooling coil 2, heat pipe 3, casing 4 and the filling material in the casing. Wherein, the number of the iron cores 1 is a plurality.

As shown in fig. 2, the water-cooled coil 2 includes a conductor tube 21 and an insulating layer 22 covering the conductor tube. The conductor pipe 21 is made of a conductive metal material, and has a cavity inside for flowing cooling water. In the present embodiment, the conductor tube 21 is an aluminum tube. The insulating layer 22 covers the conductive tube 21, and the insulating layer 22 is made of an insulating material. When the reactor is operated, the cooling water 23 flows in the conductor tube 21, and the cooling water 23 absorbs heat generated by the water-cooled coil 2 to cool the water-cooled coil 2, so that the temperature of the conductor tube 21 is slightly higher than the temperature of the cooling water 23. The water-cooled coil 2 of the present embodiment is a spiral structure, that is, the water-cooled coil 2 extends in a spiral manner.

The plurality of iron cores 1 are sleeved on the water-cooling coil 2. In the present embodiment, a plurality of cores 1 are arranged circumferentially along the axis of the helix of the water-cooled coil 2.

According to an optional technical scheme of the present disclosure, the iron core 1 is a CD-shaped iron core, and the iron core 1 includes two U-shaped sub-iron cores 11 and an anchor ear 12. The two sub-iron cores 11 are buckled to form an opening in the middle of the iron core 1 so as to be sleeved on the water-cooling coil 2. The two sub-cores 11 are fastened and connected through the hoop 12.

The heat pipe 3 includes a metal pipe body and a phase change medium located in the metal pipe body. The heat pipe 3 includes a heat absorbing portion and a cooling portion. The phase change medium absorbs heat in the heat absorption part and is evaporated into gas; the gas circulates to the cooling part to be cooled, releases heat and is gradually condensed into liquid; the liquid circulates to the heat absorption part to continuously absorb heat, so that heat conduction is realized. The heat pipe 3 of this embodiment can be an existing heat pipe, and the material of the metal pipe body can be copper.

The heat pipes 3 are connected to the conductor pipes 21 of the water-cooled coils and to the at least one iron core 1, respectively. The cooling part of the heat pipe 3 is connected with the conductor pipe 21, the heat absorbing part is connected with at least one iron core 1, and the heat of the at least one iron core 1 can be transferred to the conductor pipe 21, so that the iron core 1 can be cooled. Because the metal pipe body of the heat pipe 3 is made of conductive metal, the heat pipe 3 is respectively connected with the conductor pipe 21 of the water-cooling coil and the at least one iron core 1, so that the heat pipe 3 plays a role of an equipotential line, and the equipotential connection of the conductor pipe 21 and the iron core 1 is realized.

The housing 4 is disposed outside the core 1. The lower housing half is shown in fig. 1, and the upper housing half is arranged symmetrically to the lower housing half, not shown in the figure. In this embodiment, the reactor has an approximately cylindrical shape. The filler material is used to fill the cavity within the housing. And filling materials are arranged between the shell 4 and the water-cooling coil 2, between the shell 4 and the iron core 1 and between the iron core 1 and the water-cooling coil 2. The filling material can be made of polyurethane, and plays a role in insulation, vibration reduction and noise reduction.

The reactor of this embodiment uses the heat pipe to carry out the heat transfer to the iron core, and the quick heat transfer nature of make full use of phase change medium realizes quick effectual cooling of iron core. The equipotential connection of the iron core and the water-cooling coil is realized through the heat pipe, the phenomenon that the iron core generates an uncontrollable potential difference with the water-cooling coil due to potential suspension when the reactor operates is avoided, the local field intensity is concentrated, and the reliable operation of the reactor is guaranteed.

As shown in fig. 3, according to an alternative embodiment of the present disclosure, the heat absorbing portion of the heat pipe 3 is pressed against the surface of the core 1 by the anchor ear 12. The anchor ear 12 fastens the iron core 1 and simultaneously compresses the heat absorption part of the heat pipe 3 on the iron core 1, and the heat absorption part of the heat pipe 3 can absorb the heat generated by the iron core 1, thereby cooling the iron core.

Optionally, a first barrier layer 51 is disposed between the heat pipe 3 and the core 1 at the connection position of the heat pipe 3 and the core 1. The first isolation layer 51 is made of an electrically and thermally conductive material, such as an electrically and thermally conductive paste or an electrically and thermally conductive silicone pad. The first interlayer 51 is beneficial to improving the heat conduction efficiency between the heat pipe 3 and the iron core 1, and ensures the electrical connection relationship between the heat pipe 3 and the iron core 1.

As shown in fig. 2, according to an alternative embodiment of the present disclosure, the cooling portion of the heat pipe 3 is pressed against the surface of the conductor pipe 21 by the pressing sheet 6. Notches are provided in the insulating layer 22 to facilitate the connection of the heat pipe 3 to the conductor pipe 21. The notch position of the insulating layer 22, both ends of the pressing sheet 6 are fixedly connected with the surface of the conductor tube 21, and the cooling part of the heat pipe 3 is pressed against the surface of the conductor tube 21 due to the pressure of the pressing sheet 6. The heat of the iron core absorbed by the heat absorption part of the heat pipe 3 is conducted to the cooling part of the heat pipe 3 through the phase change medium, and the cooling part of the heat pipe 3 is tightly attached to the conductor pipe 21, so that the heat is conducted to the conductor pipe 21 by the cooling part of the heat pipe 3 and is absorbed by the cooling water 23 in the conductor pipe 21, and the iron core is cooled.

Optionally, a second barrier layer 52 is provided between the heat pipe 3 and the conductor pipe 21 at the location where the heat pipe 3 is connected to the conductor pipe 21. The second isolation layer 52 is made of an electrically and thermally conductive material, such as an electrically and thermally conductive paste or an electrically and thermally conductive silicone pad. The second isolation layer 52 is provided to improve the heat conduction efficiency between the heat pipe 3 and the conductor pipe 21, and to ensure the electrical connection relationship between the heat pipe 3 and the conductor pipe 21.

As shown in fig. 1, in an alternative solution, the cooling part of the heat pipe 3 is pressed against the surface of the conductor pipe 21, and the heat absorbing part of the heat pipe 3 is connected to all the cores 1 in turn. All the iron cores 1 are connected in series through one heat pipe 3, the heat absorption part of the heat pipe 3 can absorb the heat of each iron core 1 and transfer the heat to the conductor pipe 21, and the iron cores 1 are cooled.

Alternatively, the connection of the heat pipe 3 and the conductor pipe 21 is located at the middle layer of the spiral structure of the water-cooled coil 2. The intermediate layer of the spiral structure is a portion between the uppermost layer and the lowermost layer. In another scheme, the connection position of the heat pipe 3 and the conductor pipe 21 is positioned at the midpoint of the water-cooling coil 2. The middle point of the water-cooling coil 2 is the middle point of the water-cooling coil 2 in the length direction. In this embodiment, the water inlet and the water outlet of the water-cooling coil 2 are located on the same side, the water-cooling coil 2 is a spiral structure wound with four layers, the middle point of the water-cooling coil is located on the third layer of five layers formed in the intersection region of the water inlet and the water outlet, and the heat pipe 3 is connected with the conductor pipe 21. The adjacent cores 1 are spaced apart by a large distance, which facilitates the connection of the heat pipe 3 to the conductor pipe 21.

As shown in fig. 4 and 5, the hoop is hidden from view in fig. 4 and 5 for more visual display. In another alternative, the number of the heat pipes 3 is multiple, and each heat pipe 3 is connected with the conductor pipe 21 and at least one iron core 1 respectively.

According to an alternative technical scheme of the present disclosure, one end of the heat pipe 3 is connected with the conductor pipe 21 through the pressing sheet 6, and the other end of the heat pipe is connected with one iron core 1 and extends along the bending surface of the iron core 1 from the outer side of the iron core 1 to the inner side of the iron core 1. The heat absorption part of the heat pipe 3 is pressed on the surface of the iron core 1 through an anchor ear. The heat absorption part of the heat pipe 3 extends along the surface of the iron core 1, so that the contact area between the heat pipe 3 and the iron core 1 is increased, the heat transfer efficiency is improved, and the heat exchange of the iron core 1 is facilitated.

In this embodiment, two heat pipes 3 are connected to each core 1. Wherein, one heat pipe 3 is located on the upper part of the iron core 1, and the other heat pipe 3 is located on the lower part of the iron core 1, so that the heat transfer efficiency can be further improved. The cooling parts of the heat pipes on two adjacent iron cores 1 are connected to the conductor pipe in the middle layer of the water-cooling coil spiral structure between two adjacent iron cores 1.

It is understood that those skilled in the art can configure the size and number of the heat pipes 3 and the connection form of the heat pipes 3 and the core 1 according to the needs.

This disclosed reactor is connected through heat pipe 3 between iron core 1 and the water-cooling coil 2, utilizes the high heat exchange efficiency of heat pipe 3 to improve iron core 1 radiating efficiency, plays the effect that iron core 1 and water-cooling coil 2 carry out equipotential connection simultaneously, avoids iron core 1 to produce suspension electric potential and influences equipment normal operating.

Finally, it should be noted that: although the present disclosure has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the disclosure. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.