阅读说明：本技术 一种编织体结构磁制冷机蓄热器外壳 (Heat accumulator shell of magnetic refrigerator with woven structure ) 是由 孙剑飞 鲍颖 吕�峥 沈红先 张伦勇 宋和谦 张朝君 骆琳 尹航博策 于 2021-01-08 设计创作，主要内容包括：一种编织体结构磁制冷机蓄热器外壳,涉及一种编织体结构磁制冷机蓄热器外壳。本发明为了解决现有磁制冷机蓄热器换热面热损耗多,编织体、网状结构相变工质无相匹配的蓄热器外壳,同时现有蓄热器相变材料热量分布不均,无法实现高效制冷,制冷温区小,以及流体入口和出口处相变材料过热、过冷导致磁制冷设备使用寿命过短的问题。它由密封上盖、流体入口、壳体、保温层、换热流体通道、流体出口和制冷工质卡具组成。本发明用于磁制冷机蓄热器的外壳。(A heat accumulator shell of a magnetic refrigerator with a braided body structure relates to a heat accumulator shell of a magnetic refrigerator with a braided body structure. The invention aims to solve the problems that the heat loss of the heat exchange surface of the heat accumulator of the existing magnetic refrigerator is high, a phase change working medium with a woven body and a net structure does not have a matched heat accumulator shell, meanwhile, the heat distribution of a phase change material of the existing heat accumulator is uneven, efficient refrigeration cannot be realized, the refrigeration temperature area is small, and the service life of magnetic refrigeration equipment is too short due to overheating and supercooling of the phase change material at a fluid inlet and an outlet. The device consists of a sealing upper cover, a fluid inlet, a shell, a heat-insulating layer, a heat exchange fluid channel, a fluid outlet and a refrigeration working medium clamp. The invention is used for the shell of the magnetic refrigerator heat accumulator.)

1. The utility model provides a braid body structure magnetic refrigerator heat accumulator shell, its characterized in that braid body structure magnetic refrigerator heat accumulator shell comprises sealed upper cover (1), fluid inlet (2), casing (3), heat preservation (4), heat transfer fluid passageway (5), fluid outlet (6) and refrigeration working medium fixture (7), the inboard of casing (3) is provided with heat preservation (4), casing (3) length direction's both sides are provided with fluid inlet (2) and fluid outlet (6) respectively, the upper portion of casing (3) is provided with sealed upper cover (1), the inner chamber of casing (3) forms heat transfer fluid passageway (5), a plurality of refrigeration working medium fixtures (7) have been violently put along the fluid flow direction in the bottom surface of casing (3).

2. The woven structure magnetic refrigerator regenerator housing according to claim 1, characterized in that the refrigeration working medium clamp (7) is a detachable clamp.

3. The regenerator shell of a magnetic refrigerator with a braided body structure according to claim 2, characterized in that the refrigeration working medium clamp (7) clamps a magnetic refrigeration working medium with a net-shaped braided body structure.

4. The woven structure magnetic refrigerator regenerator housing of claim 1 further comprising clamp fixing screws (8) and clamp fixing spare screw holes (9) for fixing a refrigeration working medium clamp (7).

5. The heat accumulator housing of a magnetic refrigerator with a braided body structure according to claim 3, wherein the side edges of the magnetic refrigeration working medium with the net-shaped braided body structure are attached to the inner wall of the heat insulating layer (4).

6. The regenerator housing for a magnetic refrigerator having a woven structure according to claim 2, characterized in that the refrigerant clamp (7) has a mesh woven structure.

7. The regenerator housing for a magnetic refrigerator having a braided structure according to claim 3, wherein the magnetic refrigerant of the mesh braided structure is a magnetic phase-change refrigerant solid material.

8. The woven structure magnetic refrigerator regenerator housing according to claim 1, characterized in that the respective junctions of the sealing upper cover (1), the shell (3) and the insulating layer (4) are sealed with paint.

9. The regenerator housing for a magnetic refrigerator having a braided structure according to claim 7, wherein the preparation method of the magnetic refrigeration working medium having a mesh braided structure is performed according to the following steps:

1) smelting the magnetic refrigeration alloy master alloy ingot to cast a master alloy prefabricated rod; the master alloy cast ingot comprises the component of La_1.12Fe_11.6Si_1.4；

2) The melted mother alloy prefabricated rod is placed in a boron nitride crucible, the bottom of the mother alloy prefabricated rod is fixed by a boron nitride cylindrical rod, the position of the crucible is adjusted to enable the edge of a metal roller wheel to be right opposite to the center of the crucible, the metal roller wheel is of a wedge-shaped structure with a thick middle edge, an induction heating coil is started after the roller wheel runs stably, fiber forming technological parameters are set, and the fiber forming technological parameters are as follows: the heating current of the induction coil is 21-23A, the linear speed of the roller is 25-35 m/s, and the feeding speed of the master alloy is 3-5 × 10^-5m/s；

3) Dipping molten alloy liquid in a molten state in a molten pool by utilizing the edge of a rotating wedge-shaped metal roller wheel, forming a near spherical surface at the upper end of the molten alloy liquid when the molten alloy liquid is molten, adjusting the height of the molten alloy pool, drawing a molten alloy melt by using a melt drawing method to enable the metal roller wheel to draw the molten alloy melt, moving the alloy melt to the direction of the metal roller wheel at a feeding rate of 10-80 mu m/s, and moving the alloy melt to the direction of the metal roller wheel at 10-80⁶Cooling at a cooling rate of K/s to form a fiber yarn with the diameter of only 30-80 mu m;

4) the fiber yarns are placed into a sealed quartz tube filled with protective gas, then the quartz tube is heated to 1373K, the temperature is kept for 5 hours at 1373K, the water is cooled to room temperature after the temperature is kept, the fibers are quenched to obtain composite woven fibers, and the quenched fiber yarns are woven into a woven body with a multilayer net-shaped structure to serve as a magnetic refrigeration working medium with a net-shaped woven body structure.

Technical Field

The invention relates to a braided body structure magnetic refrigerator heat accumulator shell.

Background

The magnetic refrigeration technology is a green, environment-friendly, efficient, energy-saving and sustainable refrigeration method, the core component of the magnetic refrigerator is a heat accumulator design, and when a solid substance is used as a refrigeration working medium material, the magnetic refrigerator can be built more compactly. The phase-change heat accumulator is used as an energy storage device and mainly utilizes the heat absorption and heat release generated after the magnetization and demagnetization of a refrigerating working medium under a magnetic field. The heat accumulator has the advantages of high heat accumulation density, stable working temperature area, simple working mechanism and the like, but the heat accumulator generally has low heat accumulation efficiency, small heat accumulation temperature area and low heat release and absorption speed of the heat accumulator, and the temperature is seriously layered and is locally overcooled or overheated due to the small temperature area of the phase-change refrigeration working medium. The invention mainly aims at matching the phase-change material with a braided body structure with a heat exchange fluid, designs a matched heat accumulator shell, and meets the requirements of temperature stratification, increase of a refrigeration temperature zone and the like of a multilayer composite braided body or a reticular phase-change material. The invention designs the flexible detachable fixture, can adjust the distance between layers and the number of layers of the composite layer braided body according to the requirement, and simultaneously avoids the heat loss of a heat exchange pipeline caused by the independent design of a heat exchange surface in the original heat accumulator and the obstruction of heat conduction caused by the addition of an unnecessary structure.

Most of the existing phase change heat accumulators are provided with phase change heat exchange contact surfaces or pipelines, so that the energy storage of phase change materials is converted most effectively. However, the loss of the heat exchange surface cannot be obviously reduced by the methods, and meanwhile, when hot fluid flows in from the inlet end of the heat accumulator to enable the heat to be concentrated at the hot end, the low-temperature fluid flows out from the outlet end of the heat accumulator, the phase-change material at the hot end and the phase-change material at the cold end are single and cannot form layered refrigeration, so that the service life of the magnetic refrigerator is shortened, the refrigeration efficiency is reduced, the shell of the heat accumulator is simple to assemble and disassemble, the adjustment is easy and convenient, and the.

The refrigerant enters a magnetic field and is ordered magnetically, the magnetic entropy is reduced, heat is released, and the heat is brought to an external space through a circulating system; when the refrigerating working medium leaves the magnetic field, the magnetic disorder and the magnetic entropy are increased, and heat is absorbed from the environment through the circulating system. The core of the whole refrigeration process is a refrigeration working medium and heat accumulator structure.

Disclosure of Invention

The invention provides a heat accumulator shell of a magnetic refrigerator with a braided body structure, aiming at solving the problems that the heat loss of a heat exchange surface of a heat accumulator of the existing magnetic refrigerator is high, a braided body and a reticular structure phase change working medium have no matched heat accumulator shell, meanwhile, the heat distribution of a phase change material of the existing heat accumulator is uneven, efficient refrigeration cannot be realized, the refrigeration temperature area is small, and the service life of a magnetic refrigeration device is too short due to overheating and supercooling of the phase change material at a fluid inlet and an outlet.

The shell of the heat accumulator of the magnetic refrigerator with the braided body structure comprises a sealing upper cover, a fluid inlet, a shell, a heat insulation layer, a heat exchange fluid channel, a fluid outlet and refrigeration working medium clamps, wherein the heat insulation layer is arranged on the inner side of the shell, the fluid inlet and the fluid outlet are respectively arranged on two sides of the shell in the length direction, the sealing upper cover is arranged on the upper portion of the shell, the heat exchange fluid channel is formed in an inner cavity of the shell, and the refrigeration working medium clamps are transversely arranged on the bottom surface of the shell along the flow direction of fluid.

The invention has the following beneficial effects:

1. according to the shell of the magnetic phase change heat accumulator with the woven body and the net-shaped structure, the woven net is used as a clamp, so that the blocking effect of the joint of the heat accumulator structure and the magnetic phase change material on fluid is reduced, and the heat conduction loss is reduced.

2. The heat accumulator shell adopts the detachable fixture, can be flexibly adjusted according to the requirements of the number of layers, the type and the distance of the woven body, and can be detached and added according to the requirements.

3. The heat accumulator shell and the braid structure prepared from the magnetic phase change refrigeration working medium form a complete structure, and unnecessary heat loss is reduced without an additional heat exchange surface.

4. The net-shaped braided body structure is combined with the heat accumulator shell into a whole in a clamping mode, so that the use of granular refrigerant binder is reduced, the refrigeration efficiency is reduced, and the service life is prolonged.

5. According to the invention, because the fluid is in direct contact with the magnetic phase change refrigerating working medium, high-efficiency corresponding refrigeration can be realized, the heat exchange efficiency is improved, and the problems of uneven heat exchange, narrow refrigeration region and the like are solved.

Description of the drawings:

FIG. 1 is a schematic structural diagram of a regenerator housing of a magnetic refrigerator in a braid structure;

FIG. 2 is a top view of FIG. 1;

fig. 3 is a side sectional view of fig. 1.

The specific implementation mode is as follows:

the technical scheme of the invention is not limited to the specific embodiments listed below, and any reasonable combination of the specific embodiments is included.

The first embodiment is as follows: the embodiment is described with reference to fig. 1 to 3, the heat accumulator housing of the magnetic refrigerator with a woven structure in the embodiment is composed of a sealing upper cover 1, a fluid inlet 2, a housing 3, a heat insulating layer 4, a heat exchange fluid channel 5, a fluid outlet 6 and a refrigeration working medium clamp 7, the heat insulating layer 4 is arranged on the inner side of the housing 3, the fluid inlet 2 and the fluid outlet 6 are respectively arranged on two sides of the housing 3 in the length direction, the sealing upper cover 1 is arranged on the upper portion of the housing 3, the heat exchange fluid channel 5 is formed in an inner cavity of the housing 3, and the bottom surface of the housing 3 is transversely provided with the refrigeration working medium clamps 7 along the fluid flowing direction.

In the heat release process of the phase change material of the heat accumulator of the embodiment, the magnetic phase change refrigeration working medium is in order under an external magnetic field, the magnetic entropy is reduced, the braided body refrigeration working medium releases heat, the low-temperature heat exchange fluid flows in from the right end of the heat accumulator and flows through the fiber braided structure gap, the high-temperature phase change material transfers heat to the fluid, and the fluid after being heated flows out from the left end of the heat accumulator, so that the heat release process is realized.

In the heat storage process of the phase-change material of the heat accumulator, the magnetic phase-change refrigeration working medium leaves an external magnetic field, the magnetism is disordered, the magnetic entropy is increased, the braided body refrigeration working medium absorbs heat, the high-temperature heat exchange fluid flows in from the left side of the heat accumulator and flows through the gaps of the fiber braided structure, the high-temperature fluid transfers the heat to the low-temperature magnetic phase-change material, and the cooled fluid flows out from the right end of the heat accumulator, so that the heat absorption process is realized.

The heat exchange fluid channel and the fiber braid form a fluid circulation gap to form a direct heat exchange surface, when the fiber braid magnetic phase change refrigeration working medium generates a magnetic field outside the heat accumulator shell, the magnetic ordered magnetic entropy of the magnetic phase change fiber material is reduced to release heat, the heat of the magnetic refrigeration working medium is transferred to the fluid, the low-temperature fluid flows in from the right fluid inlet at the moment, the left fluid outlet flows out, and the heat is brought to the outside through the circulation system. When the fiber woven body magnetic phase change refrigerating working medium leaves a magnetic field by removing the magnet outside the heat accumulator shell, the magnetic phase change fiber material magnetic disorder magnetic entropy becomes to absorb heat, the heat of the fluid flows to the magnetic refrigerating working medium, the high-temperature fluid flows in from the left fluid outlet at the moment, the right fluid inlet flows out, and the environment heat is absorbed through the circulating system.

The purpose of this embodiment is to provide an insulating layer to reduce heat loss.

The clamp of the shell of the magnetic phase change heat accumulator is designed to be of a detachable mesh structure, so that the installation of a multilayer composite refrigeration woven structure is met, the refrigeration interval is increased, and the layering phenomenon caused by the single magnetic phase change material is avoided.

The embodiment adopts a clamping type combined fixture and a magnetic phase change braided body, so that uneven heating and insufficient heat exchange generated by less adhesive are realized, and the problem of reduction of the service life of the fluid due to frequent scouring is solved.

The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: the refrigeration working medium clamp 7 is a detachable clamp. Other steps and parameters are the same as in the first embodiment.

The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: and the refrigerating working medium clamp 7 clamps the magnetic refrigerating working medium with the reticular braided body structure. Other steps and parameters are the same as in the first or second embodiment.

The fourth concrete implementation mode: the difference between this embodiment mode and one of the first to third embodiment modes is: the woven body structure magnetic refrigerator heat accumulator shell further comprises a clamp fixing screw 8 and a clamp fixing spare screw hole 9 for fixing a refrigeration working medium clamp 7. Other steps and parameters are the same as in one of the first to third embodiments.

The heat accumulator shell of the embodiment is provided with the detachable clamps, the number of the clamps can be assembled and disassembled as required, and the distance between the clamps can be adjusted. Meanwhile, each fixture is made of a net, so that the blocking pressure blocking and the thermal stress loss of the fluid passing through the magnetic refrigeration working medium with the net woven structure are reduced. After the mesh-shaped braided body structure refrigerating working medium is clamped into the clamping groove, the shell of the phase change heat accumulator, the phase change material and the heat exchange pipeline are connected into a whole, the heat loss of the structure can be effectively solved, and the problems of uneven temperature distribution, over-cooling and over-heating of a cold end and a hot end, service life reduction and the like can be effectively solved by placing the phase change refrigerating material close to a corresponding temperature area according to a refrigerating temperature area.

Because the heat exchange pipeline is formed in the magnetic phase change heat accumulator shell, after the net-shaped woven structure refrigerating working medium is installed, the heat exchange pipeline and the heat exchange pipeline are connected into a whole, and the heat loss of the structure and the uneven heat transfer of local fluid can be reduced. The refrigeration working medium is made of a fiber structure, the natural specific area is large, so that heat exchange and refrigeration are better, the gaps woven between the fibers can enable fluid to generate heat exchange, and the heat loss of a method of connecting a binder and other methods with a refrigeration phase-change material is avoided.

The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: the side edge of the magnetic refrigeration working medium with the net-shaped woven structure is attached to the inner wall of the heat preservation layer 4. Other steps and parameters are the same as in one of the first to fourth embodiments.

The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is: the refrigeration working medium clamp 7 is of a net-shaped woven structure. Other steps and parameters are the same as in one of the first to fifth embodiments.

This embodiment can reduce the occurrence of an obstruction effect when a fluid flows.

This embodiment utilizes flat screw fixed reduction to hinder the fluid, and the fixture chooses for use network structure can the fluid to pass through, and unordered binder just can be fixed with the fibrous braided body constitutional unit clip, forms the integrative liquid flow gap that complete fibrous braided body and heat transfer fluid channel 5 combine, can realize great specific surface area heat transfer.

The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: the magnetic refrigeration working medium with the reticular braided body structure selects a magnetic phase change refrigeration solid material. Other steps and parameters are the same as in one of the first to sixth embodiments.

The material is prepared into a net-shaped braided body structure before use.

The specific implementation mode is eight: the present embodiment differs from one of the first to seventh embodiments in that: the corresponding joints of the upper sealing cover 1, the shell 3 and the insulating layer 4 are sealed by paint. Other steps and parameters are the same as in one of the first to seventh embodiments.

This embodiment can make this inner space adiabatic state, increases heat exchange efficiency, reduces calorific loss.

The specific implementation method nine: the present embodiment differs from the first to eighth embodiments in that: the preparation method of the magnetic refrigeration working medium with the reticular braided body structure is carried out according to the following steps:

1) smelting the magnetic refrigeration alloy master alloy ingot to cast a master alloy prefabricated rod; the master alloy cast ingot comprises the component of La_1.12Fe_11.6Si_1.4；

2) The melted mother alloy prefabricated rod is placed in a boron nitride crucible, the bottom of the mother alloy prefabricated rod is fixed by a boron nitride cylindrical rod, the position of the crucible is adjusted to enable the edge of a metal roller wheel to be right opposite to the center of the crucible, the metal roller wheel is of a wedge-shaped structure with a thick middle edge, an induction heating coil is started after the roller wheel runs stably, fiber forming technological parameters are set, and the fiber forming technological parameters are as follows: the heating current of the induction coil is 21-23A, and the linear speed of the roller25 to 35m/s, a mother alloy feed rate of 3 to 5 × 10^-5m/s；

3) Dipping molten alloy liquid in a molten state in a molten pool by utilizing the edge of a rotating wedge-shaped metal roller wheel, forming a near spherical surface at the upper end of the molten alloy liquid when the molten alloy liquid is molten, adjusting the height of the molten alloy pool, drawing a molten alloy melt by using a melt drawing method to enable the metal roller wheel to draw the molten alloy melt, moving the alloy melt to the direction of the metal roller wheel at a feeding rate of 10-80 mu m/s, and moving the alloy melt to the direction of the metal roller wheel at 10-80⁶Cooling at a cooling rate of K/s to form a fiber yarn with the diameter of only 30-80 mu m;

4) the fiber yarns are placed into a sealed quartz tube filled with protective gas, then the quartz tube is heated to 1373K, the temperature is kept for 5 hours at 1373K, the water is cooled to room temperature after the temperature is kept, the fibers are quenched to obtain composite woven fibers, and the quenched fiber yarns are woven into a woven body with a multilayer net-shaped structure to serve as a magnetic refrigeration working medium with a net-shaped woven body structure. Other steps and parameters are the same as in one of the first to eighth embodiments.

The beneficial effects of the present invention are demonstrated by the following examples:

the shell of the heat accumulator of the magnetic refrigerator with the braided body structure is composed of a sealing upper cover 1, a fluid inlet 2, a shell 3, a heat insulation layer 4, a heat exchange fluid channel 5, a fluid outlet 6 and refrigerating working medium clamps 7, wherein the heat insulation layer 4 is arranged on the inner side of the shell 3, the fluid inlet 2 and the fluid outlet 6 are respectively arranged on two sides of the shell 3 in the length direction, the sealing upper cover 1 is arranged on the upper portion of the shell 3, the heat exchange fluid channel 5 is formed in an inner cavity of the shell 3, and the plurality of refrigerating working medium clamps 7 are transversely arranged on the bottom surface of the shell 3 in the fluid.

The refrigeration working medium clamp 7 is a detachable clamp. And the refrigerating working medium clamp 7 clamps the magnetic refrigerating working medium with the reticular braided body structure. The woven body structure magnetic refrigerator heat accumulator shell further comprises a clamp fixing screw 8 and a clamp fixing spare screw hole 9 for fixing a refrigeration working medium clamp 7. The side edge of the magnetic refrigeration working medium with the net-shaped woven structure is attached to the inner wall of the heat preservation layer 4. The refrigeration working medium clamp 7 is of a net-shaped woven structure. The magnetic refrigeration working medium with the reticular braided body structure selects a magnetic phase change refrigeration solid material. The corresponding joints of the upper sealing cover 1, the shell 3 and the insulating layer 4 are sealed by paint.

The shell of the magnetic phase change heat accumulator with the woven body and the net-shaped structure, which is provided by the embodiment, adopts the woven net as a clamp, reduces the blocking effect of the joint of the heat accumulator structure and the magnetic phase change material on fluid, and reduces heat conduction loss.

The detachable fixture adopted by the heat accumulator shell of the embodiment can be flexibly adjusted according to the requirements on the number of layers, the type and the distance of a woven body, and can be detached and added according to the requirements.

The heat accumulator shell and the woven structure prepared from the magnetic phase change refrigeration working medium form a complete structure, and unnecessary heat loss is reduced without an additional heat exchange surface.

The mesh-shaped woven structure is combined with the heat accumulator shell into a whole in a clamping mode, so that the use of granular refrigerant binder is reduced, the refrigeration efficiency is reduced, and the service life is prolonged.

This embodiment is because fluid and magnetic phase transition refrigerant direct contact, can realize high-efficient corresponding refrigeration, has improved heat exchange efficiency, has reduced the heat transfer simultaneously inhomogeneous, the narrow and small scheduling problem in refrigeration interval.