CN115691936A - Heat dissipation coil based on phase-change material - Google Patents

Abstract

The application relates to a heat dissipation coil based on phase change materials, which includes: an insulating frame; an insulating baffle, which is installed at both ends of the insulating frame to form a space for winding the coil; a mounting groove; a heat dissipation shell, which is arranged in the mounting groove, and a phase change material is encapsulated in it. Since the heat dissipation shell is slotted on the insulating baffle, the interior of the heat dissipation shell is filled with phase change materials, and the heat of the coil work is transmitted to the inside of the heat dissipation shell. The endothermic properties of the phase change material dissipate heat from the coil, and when the coil works, the exothermic properties of the phase change material in the phase change transformation process return to the initial state. The heat dissipation shell cooperates with the phase change material inside to dissipate heat, and at the same time ensure the overall structural strength to prevent the excessive axial electromagnetic force of the coil from deforming or even destroying the heat dissipation shell. Compared with the traditional coil water cooling and heat dissipation structure, the invention is simpler and more compact, and has higher cost performance.

Description

A cooling coil based on phase change material

technical field

The present application relates to the field of pulse power coils, in particular to a heat dissipation coil based on phase change materials.

Background technique

At present, pulsed power coils play an indispensable and important role in the fields of contemporary military, scientific research and space launch, and their performance is directly related to the working efficiency of the equipment. Concentration requirements, while the coil in the coil transmitter must first meet the characteristics of high strength and concentrated magnetic field, and the temperature rise requirement is relatively small. Although selecting high-quality materials for coil optimization design is also a way to improve coil performance, but before that, the improvement of coil manufacturing process and methods plays a greater role and should be considered first.

The traditional coil winding method is very simple and direct, that is, it is tightly wound from the first end of the fixing device, and after one layer is wound, the direction is changed and the coil is wound back, and so on until the end is completed. Such a structure will bring many problems: because the coil is wound with a single coil, the current distribution of the entire coil is basically uniform, but the more layers the coil is wound, the more difficult it will be for the inner coil to dissipate heat, resulting in coil The internal temperature rise is too high. Under the continuous pulse discharge operation, the internal temperature rise of the coil drops slowly, which may easily lead to coil insulation damage; the pulse transmitting coil is usually passed a large current to make it generate a strong magnetic field, so as to meet the required requirements. When a strong magnetic field is generated, the temperature rise of the coil will also increase accordingly, resulting in excessive temperature of the entire coil, causing fatigue damage to the coil and reducing the service life of the coil.

In some related technologies, the method of quickly dissipating heat from the coil is to open a hole at one end of the coil, then run through the entire coil, and pass a coolant through the hole to cool down quickly, but there are the following problems:

This method needs to add special water-cooling equipment, the structure is complex, and the investment cost is high. Moreover, due to the huge electromagnetic force, the coil wire may be deformed to block the cooling channel, and even cause the coil to be damaged. Therefore, how to balance large current, strong magnetic field, high stress, and slow temperature rise and drop inside the coil is always an urgent problem to be solved.

Contents of the invention

The embodiment of the present application provides a heat dissipation coil based on a phase change material to solve the problem in the related art that the coil is deformed due to a huge electromagnetic force, thus blocking the cooling channel.

In a first aspect, a heat dissipation coil based on a phase change material is provided, which includes:

insulation skeleton;

An insulating baffle, which is installed at both ends of the insulating frame to form a space for coil winding; the axial outer side of the insulating baffle is provided with a plurality of installation slots;

The heat dissipation shell is arranged in the installation groove, and a phase change material is encapsulated in it.

In some embodiments, the insulating frame and the insulating baffle are made of high-strength insulating materials.

In some embodiments, the depth of the installation groove is smaller than the thickness of the insulating baffle;

The heat dissipation housing adopts a hollow closed housing inside and is fixed in the installation groove.

In some embodiments, a plurality of the installation slots are arranged at intervals; one of the heat dissipation housings is correspondingly arranged in each installation slot.

In some embodiments, a heat dissipation support is provided inside the heat dissipation housing.

In some embodiments, the heat dissipation housing and the heat dissipation support are made of metal materials.

In some embodiments, the number of the heat dissipation supports is one or more.

In some embodiments, the phase change material is a solid phase change material or a composite phase change material.

In some embodiments, an encapsulation layer for wrapping the coil is provided between the two insulating baffles.

The beneficial effects brought by the technical solution provided by the application include:

The embodiment of the present application provides a heat dissipation coil based on a phase change material. Since the heat dissipation shell is placed by slotting on the insulating baffles on both sides, the inside of the heat dissipation shell is filled with a phase change material. When the heat of the coil is transferred to the heat dissipation shell Inside, when the phase change temperature of the phase change material is reached, the coil is rapidly dissipated through the energy storage characteristics of the phase change material during the phase change process, and the phase change material is filled inside the heat dissipation shell. The phase change material is the solution to the continuous emission For the heat dissipation problem, the water cooling structure can be eliminated to enhance the heat dissipation effect. At the same time, the cooperation between the installation groove and the heat dissipation shell enhances the structural strength of the entire structure, so as to solve the problem of blockage of the internal cooling channel of the coil due to excessive electromagnetic force and the problem of poor water cooling and heat dissipation of the coil.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Figure 1 is a schematic diagram of a skeleton and an insulating baffle provided by an embodiment of the present application;

Fig. 2 is a schematic diagram of a coil wound on an insulating skeleton provided by an embodiment of the present application;

Fig. 3 is a schematic diagram of the insulation baffle provided by the embodiment of the present application inserted into the heat dissipation housing and the heat dissipation support;

Fig. 4 is a schematic diagram of filling a phase change material in a heat dissipation housing provided by an embodiment of the present application;

Fig. 5 is a top view of a heat dissipation coil based on a phase change material provided in an embodiment of the present application;

FIG. 6 is an overall structural diagram of a heat dissipation coil based on a phase change material provided in an embodiment of the present application.

In the figure: 1. Insulation frame; 2. Insulation baffle; 3. Coil; 4. Heat dissipation shell; 5. Heat dissipation support; 6. Phase change material; 7. Encapsulation layer.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, but not all of them. Based on the embodiments in the present application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present application.

The embodiment of the present application provides a heat dissipation coil based on a phase change material to solve the problem in the related art that the coil will be deformed due to a huge electromagnetic force, thus blocking the cooling channel.

Please refer to Figure 1-Figure 6, a heat dissipation coil based on phase change materials, which includes:

Insulating frame 1; insulating baffle 2, which is installed at both ends of insulating frame 1 to form a space for winding coil 3; insulating baffle 2 is provided with a plurality of installation grooves on the side away from insulating frame 1; that is, insulating baffle There are multiple installation slots on the outside of the axial direction of 2, where the axial direction is the axial direction of the insulating frame 1, and the outer side corresponds to the inner side, and the inner side refers to the side where the insulating baffle 2 is in contact with the coil 3, so the outer side refers to The opposite side of the insulating baffle 2; the heat dissipation shell 4, which is arranged in the installation groove, and the phase change material 6 is encapsulated therein.

Wherein, as shown in Fig. 1 and Fig. 2, a rapid heat dissipation coil provided by an embodiment of the present invention may include: an insulating skeleton 1, which is used for winding a coil 3, is cylindrical, and its material may be PE etc., the outer wall is required to be smooth and have a certain thickness. The thickness is for the convenience of connecting the insulating baffles 2 at both ends with screws, and it is also required to have sufficient strength to support the coils wound on it, and can withstand the interaction force between the coils , and the number of layers of the coil 3, the number of winding turns and the winding direction can be flexibly set according to actual needs; the insulating baffle 2 is fixed on the opposite ends of the insulating frame 1, and the insulating baffle 2 is protruded from the insulating frame 1, the insulating frame 1 and the insulating baffle 2 are made of high-strength insulating material, the insulating baffle 2 is slotted for placing the heat dissipation shell 4, the insulating baffle 2 is circular, and its material can be epoxy Resin, etc. require high strength and a certain thickness. The high strength is to withstand the huge axial electromagnetic force generated by the coil without deformation. The diameter of 2 is greater than the diameter of insulating skeleton 1.

Due to the high thermal conductivity of the heat dissipation shell 4, the heat can quickly enter one side of the heat dissipation shell 4 through heat conduction, and then enter the inside. The energy storage characteristics in the transformation process quickly dissipate heat from the coil, and the heat is also dissipated from the other side of the heat dissipation shell 4 to achieve a heat dissipation effect; while performing heat dissipation, the heat dissipation shell 4 in the installation groove is used as a supporting reinforcement, Strengthen the overall structure of the coil to prevent the deformation of the coil due to the huge electromagnetic force, thereby blocking the cooling channel. In order to take into account the working environment of high coil current, strong magnetic field and high stress.

Since the heat dissipation housing 4 is slotted on the insulating baffle 2, the interior of the heat dissipation housing 4 is filled with the phase change material 6, and the heat of the coil operation is transmitted to the inside of the heat dissipation housing 4. When the phase change temperature of the phase change material 6 is reached, the phase change The endothermic property of the material 6 during the phase change transformation process dissipates heat to the coil, and when the coil works, the exothermic property of the phase change material 6 during the phase change transformation process returns to the original state again. The heat dissipation shell 4 cooperates with the phase change material 6 inside to dissipate heat, while ensuring the overall structural strength, preventing the heat dissipation shell 4 from being deformed or even damaged by excessive electromagnetic force in the axial direction of the coil. high.

Referring to Fig. 3, in some embodiments, the depth of the installation groove is smaller than the thickness of the insulating baffle 2, that is, the installation groove does not penetrate the insulating baffle 2; Installed in the slot, the packaging should meet the insulation and strength requirements, ensuring the insulation effect of the insulating baffle 2 and also meeting the structural strength.

There are multiple installation slots, which are distributed in a ring shape, and there is a designed distance between two adjacent installation slots; a heat dissipation shell 4 is correspondingly arranged in each installation slot.

Such a setting can make a plurality of cooling shells 4 unable to form a closed ring to prevent damage due to huge electromagnetic force; wherein the ring can be circular, elliptical or rectangular, and the design distance can be set according to needs, so that the heat dissipation The shells 4 are evenly spaced or unevenly spaced.

The above installation grooves can be rectangular, trapezoidal, fan-shaped, etc., and the heat dissipation housing 4 is placed inside the insulating baffle plate 2. The depth of the installation groove is greater than the height of the heat dissipation housing 4, which is used to completely place the heat dissipation housing 4. In addition, the cooling shell 4 can enhance the heat transfer efficiency. In order to enhance the structural strength of the insulating baffle 2, the cooling shell 4 can be made of steel. In order to reduce the overall weight of the coil, the cooling shell 4 can be made of aluminum. 4 After the phase change material is filled inside, 6 is put into the insulating baffle 2, and then packaged and fixed. Wherein, the cooling case 4 is fan-shaped, with a single fan-shaped angle of 70°, an inner diameter of 65 mm, an outer diameter of 89 mm, a wall thickness of 1 mm, and a height of 11 mm. The cooling case 4 can also be of other shapes and sizes.

Referring to FIG. 4 , in some embodiments, a heat dissipation support 5 is disposed inside the heat dissipation housing 4 . The heat dissipation shell 4 and the heat dissipation support member 5 are made of metal material, which can accelerate heat conduction and heat dissipation.

The first type: the number of heat dissipation support members 5 is one, and the internal space of the heat dissipation housing 4 is divided into two connected first spaces and second spaces;

Both the first space and the second space are filled with solid phase change materials; or, both the first space and the second space are filled with composite phase change materials; or, both the first space and the second space are filled with liquid phase change materials; or , the first space is filled with a liquid phase change material, and the second space is filled with a solid phase change material. Composite phase-change materials and solid-state phase-change materials should choose the type with stronger heat dissipation performance among the existing materials.

In this embodiment, the heat dissipation support member 5 also has several forms, specifically as follows:

Form 1, which is convenient for packaging, one end of the heat dissipation support 5 is connected to the bottom wall, and a channel is formed between the other end and the top wall of the heat dissipation housing 4;

Form 2, the two ends of the heat dissipation support 5 are respectively connected to the bottom wall and the top wall of the heat dissipation housing 4, and channels are provided on the heat dissipation support 5

In the third form, the first space and the second space may not be connected to each other.

The second type: the number of heat dissipation support members 5 is multiple, and distributed along the extension direction of the heat dissipation housing 4; the heat dissipation housing 4 is also provided with a reinforcement, and the two ends of the reinforcement are respectively connected to two adjacent heat dissipation support members. 5 are vertically connected, and the reinforcement is actually a heat dissipation support 5 .

specific:

The heat dissipation support 5 is made of a metal material. In order to make the phase change material melt quickly, the heat dissipation support can choose a metal material with high thermal conductivity, such as copper, aluminum, etc.; the heat dissipation support 5 is placed in the heat dissipation shell 4 Inside, the heat dissipation support 5 can increase the contact area with the phase change material 6, and adjust the heat-absorbing melting speed of the phase change material 6. The height of the heat dissipation support 5 is smaller than the height of the internal space of the heat dissipation shell 4, which is convenient for subsequent packaging and fixing processing . The heat dissipation support 5 is fan-shaped, the angle of a single fan is 10°, and the height is 10mm. The heat dissipation support 5 can also be of other shapes and sizes. In this embodiment, only a single heat dissipation support 5 is placed inside a single heat dissipation housing 4. In order to have more contact area with the phase change material and melt the phase change material more quickly, a plurality of heat dissipation support members 5 can be placed inside the heat dissipation housing 4, and when placing a plurality of heat dissipation support members 5, adjacent two The reinforcements are placed vertically between the 5 cooling supports. The size, shape and structure of the heat dissipation support member 5 can be designed according to the heat dissipation rate and structural requirements.

In some preferred embodiments, in order to prevent the phase change material 6 from melting and leaking, an avoidance gap is provided between the phase change material 6 and the inner wall of the heat dissipation housing 4, which considers that the phase change material 6 is in a solid or liquid state , the maximum volume cannot exceed the space formed by the heat dissipation shell and the heat dissipation support; a specific embodiment can be: the height of the phase change material 6 is smaller than the height of the inner space of the heat dissipation shell 4, because the volume of the phase change material 6 after melting Increase, in order to avoid leakage, so the avoidance space is set. The phase change material 6 may be a solid-solid phase change material or a composite phase change material. The shape of the phase-change material 6 is also fan-shaped, with a single fan-shaped angle of 30° and a height of 10 mm.

Wherein, just because the phase change material 6 is a solid phase change material, the heat dissipation housing 4 may not adopt an internal hollow closed shell, that is, a metal shell with an opening, in which a heat dissipation support member 5 is arranged, and the solid phase change material is filled. In the heat dissipation case 4, the heat dissipation case 4 is packaged in the installation groove through insulating packaging.

5, in some embodiments, the phase change material 6 is filled on both sides of the heat dissipation support 5 inside the heat dissipation housing 4, and the phase change material 6 is in close contact with the heat dissipation support 5. Since the heat dissipation housing 4 and The heat dissipation support member 5 has a high thermal conductivity, and the heat can quickly enter the shell through heat conduction, so that the phase change material undergoes a phase change to dissipate heat from the coil, which solves the problem of blockage of the internal cooling channel of the coil due to excessive electromagnetic force.

Referring to Fig. 6, in some embodiments, an encapsulation layer 7 can be installed on the outside of the insulating frame 1, and the encapsulation layer 7 extends from the insulating baffle 2 at one end to the insulating baffle 2 at the other end. In this embodiment, the insulating The frame 1 is in the shape of a cylinder, and the encapsulation layer 7 is installed on the outside of the insulating frame 1 to reinforce the coil 3 and to insulate it.

The principle is:

When the coil 3 is energized, heat will be generated in the coil 3. When the temperature of the coil 3 reaches the phase change temperature of the phase change material 6, the phase change material 6 will melt and absorb heat in the form of latent heat. temperature, thereby reducing the temperature of the coil. At the same time, more heat dissipation support members 5 can be formed in the shell, and composite phase change materials with high thermal conductivity can be used to fully melt the phase change materials to realize rapid heat dissipation of the coil.

In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower" and so on is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description. It is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed, or operate in a particular orientation, and thus should not be construed as limiting the application. Unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be interpreted in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, It can also be an electrical connection; it can be a direct connection, or an indirect connection through an intermediary, or an internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.

It should be noted that in this application, relative terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply There is no such actual relationship or order between these entities or operations. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The above descriptions are only specific implementation manners of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the application. Therefore, the present application will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims (9)

1. A cooling coil based on phase change material, characterized in that it comprises: insulating frame (1); An insulating baffle (2), which is installed at both ends of the insulating frame (1) to form a space for winding the coil (3); the axial outer side of the insulating baffle (2) is provided with a plurality of installation grooves; The heat dissipation shell (4) is arranged in the installation groove, and the phase change material (6) is encapsulated in it. 2. The heat dissipation coil based on phase change material as claimed in claim 1, characterized in that: The insulating frame (1) and the insulating baffle (2) are made of high-strength insulating materials. 3. The heat dissipation coil based on phase change material as claimed in claim 1, characterized in that: The depth of the installation groove is smaller than the thickness of the insulating baffle (2); The heat dissipation housing (4) adopts a closed housing with a hollow inside, and is fixed in the installation groove. 4. The heat dissipation coil based on phase change material as claimed in claim 1, characterized in that: A plurality of the installation slots are arranged at intervals; one of the heat dissipation housings (4) is correspondingly arranged in each installation slot. 5. The heat dissipation coil based on phase change material as claimed in claim 1, characterized in that: The heat dissipation housing (4) is provided with a heat dissipation support (5). 6. The heat dissipation coil based on phase change material as claimed in claim 5, characterized in that: The heat dissipation housing (4) and heat dissipation support (5) are made of metal materials. 7. The heat dissipation coil based on phase change material as claimed in claim 5, characterized in that: The number of the heat dissipation support (5) is one or more. 8. The heat dissipation coil based on phase change material as claimed in claim 1, characterized in that: The phase change material (6) is a solid phase change material or a composite phase change material. 9. The heat dissipation coil based on phase change material as claimed in claim 1, characterized in that: An encapsulation layer (7) for wrapping the coil (3) is arranged between the two insulating baffles (2).

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