CN210892253U - Thermoacoustic refrigerator - Google Patents

Abstract

The utility model discloses a heat sound refrigerator, including frame and expansion piston subassembly and the power piston subassembly that both sides set up respectively about it, power piston subassembly outside end is equipped with the coil structure, and the frame upside is connected the vacuum can through external solid fixed ring and is formed to expansion piston subassembly's is airtight, and the downside is connected the shell and is formed to power piston subassembly and coil structure's is airtight, and the shell bottom side still is connected with damper. The utility model discloses form the one deck by interior and extrinsic cycle's air film on expansion piston surface, avoid expansion piston and the inside contact of cylinder body, adopt the gas suspension state to replace the regenerator structure to, the refrigeration effect of whole device is good, and stability is high.

Description

Thermoacoustic refrigerator

Technical Field

The utility model relates to a refrigeration technology field, concretely relates to refrigeration structure, in particular to heat sound refrigerator.

Background

Different from the traditional circulation theory, the circulation theory adopted by the sound energy compressor is a more efficient thermodynamic theory, and with the continuous development of new technology, the sound energy compressor is also paid more and more attention by technicians.

The thermoacoustic refrigerator uses N2 or He as working medium, belongs to green working medium, and has no damage to atmospheric ozone layer. Therefore, the thermoacoustic compressor is a novel pressure wave generator with development potential, and has wide application prospect in places with space and power transmission difficulty but heat energy supply capability (such as petroleum and natural gas exploitation in open sea or desert).

In the sound energy compressor, the piston structure and the air floating structure are arranged in the machine base and the shell, the upper portion of the machine base is matched with the vacuum tank through the connecting piece to form the expansion piston air floating structure, the lower portion of the machine base is provided with the power piston and the air floating structure through the shell, and meanwhile, the elastic structure is arranged, so that the structure of the machine base is particularly important, the upper portion and the lower portion of the machine base can be supported, and the sealing performance of the machine base is guaranteed.

Meanwhile, the coil structure is used as a driving part for the operation of the power piston, and an axial magnetic field is formed in the coil, so that the shaft lever of the piston can be driven to do reciprocating linear motion, the structure is very important, whether the power piston can reach the ideal amplitude is determined by the power of the coil, and the design of the coil structure is very important.

Therefore, there is a need to develop a new thermoacoustic refrigerator

SUMMERY OF THE UTILITY MODEL

The utility model provides a solve above-mentioned problem, provide a heat sound refrigerator, form the one deck by interior and extrinsic cycle's gas film on expansion piston surface, avoid expansion piston and the inside contact of cylinder body, adopt the gas suspension state to replace the regenerator structure to, whole device's refrigeration effect is good, and stability is high.

In order to achieve the above purpose, the utility model adopts the technical scheme that: a thermoacoustic refrigerator comprises a base, an expansion piston assembly and a power piston assembly, wherein the expansion piston assembly and the power piston assembly are respectively arranged on the upper side and the lower side of the base;

the expansion piston assembly comprises a head tank and an expansion piston which can reciprocate and is coaxially suspended in the head tank, the upper part of the head tank is connected with a cover body, the lower part of the head tank is connected with a communication hole cylinder, the expansion piston comprises a hollow expansion piston body and a hollow seat body connected with the bottom of the hollow expansion piston body, and an air inlet one-way valve is arranged between the hollow expansion piston body and the hollow seat body;

the bottom of the hollow seat body is provided with a piston rod;

the top side of the expansion piston body is circumferentially provided with a first through hole, and the upper side and the lower side of the expansion piston body are both provided with heat absorption fins;

a second through hole is formed in the middle of the hollow seat body in the circumferential direction, and a third through hole is formed in the bottom of the hollow seat body in the circumferential direction;

the power piston assembly comprises a power piston body, a hollow expansion piston channel column is arranged in the power piston body, an air inlet one-way valve is arranged at the top of the expansion piston channel column and communicated with an air chamber space between the expansion piston channel column and the power piston body, a plurality of first air channel are uniformly distributed and arranged up and down on the circumference of the power piston body and communicated with the air chamber space, and a supplementary air channel is also arranged between the top and the circumference of the power piston body;

the bottom side of the power piston body is coaxially provided with an elastic piece fixing structure which is a threaded groove body and is communicated with the expansion piston channel column, a piston rod penetrates through the expansion piston channel column and the elastic piece fixing structure at the same time and then is connected with a first elastic piece at the bottom, the elastic piece fixing structure is connected with a second elastic piece, and a receiving piece is arranged between the first elastic piece and the second elastic piece.

Furthermore, the coil structure comprises a coil frame body, a magnetic ring and an iron ring from outside to inside, a coil is wound on the coil frame body, the coil is wound on the coil frame body from inside to outside, 18 coils are wound in a single layer mode, 3 layers are wound, a coil structure fixing frame is further arranged at the lower end of the coil, and a lining ring is arranged between the magnetic ring and the iron ring.

Further, the frame include the frame body and with this body coupling's of frame power piston cylinder, the frame body is cylinder lid structure, its inside cavity, and the top is equipped with the connection convex part, the edge of frame body is platform portion, platform portion downside is echelonment be equipped with casing fixed platform and coil fixed platform.

Further, the power piston assembly is arranged in the power piston cylinder, the iron ring is sleeved on the outer side of the power piston cylinder, and the coil structure fixing frame is fixedly connected with the coil fixing platform.

Furthermore, the power piston cylinder is fixed on the inner side surface of the machine base body from bottom to top through a connecting ring on the outer side surface of the power piston cylinder, the power piston cylinder penetrates through the hollow structure of the machine base body to form an annular connecting part at the top, the connecting convex part comprises a first connecting convex part and a second connecting convex part which are concentrically and annularly arranged, and the first connecting convex part and the second connecting convex part are located at the outer side end of the annular connecting part.

Furthermore, the external fixed ring comprises a connecting part at the upper side and a heat radiating part at the lower side, the connecting part and the heat radiating part are coaxially arranged and are both of a cylindrical structure with a hollow inner part, a connecting flange is arranged at the top of the connecting part, a secondary bearing platform is arranged at the top of the connecting flange in a stepped manner towards the inside, the fixed bearing platform arranged in the circumferential direction at the inner side of the upper part of the heat radiating part is fixedly connected with the lower side of the connecting part, an embedded groove is arranged at the lower side of the heat radiating part, the embedded groove comprises a first embedded groove and a second embedded groove, and the first embedded groove and the second embedded groove are matched and fixed with the first connecting convex.

Furthermore, the supplementary gas circuit comprises a plurality of second gas circuit through holes arranged on the top end surface of the power piston body and a plurality of third gas circuit through holes arranged on the circumferential surface of the power piston body, the gas circuit pipeline is positioned in the side wall of the power piston body and is not communicated with the gas chamber space, and the bottom side of the power piston body is a seat body.

Furthermore, a hole groove is formed in the circumferential direction of the heat absorbing fins at the top and communicated with the first through hole, an air groove is formed in the communicating hole cylinder, nine-hole cotton is arranged between the two heat absorbing fins on the inner side of the expansion piston body, and the cover body is a copper head cover body.

Further, the heat dissipation part is a red copper heat dissipation part.

To sum up, the utility model discloses possess following advantage:

1. the utility model discloses a coaxial setting expansion piston of head jar forms the expansion chamber to through the through-hole setting of three departments about in, the use of cooperation check valve forms by interior and outer gas suspension structure, and simultaneously, the gas circuit hole at power piston structure top and the venthole of lateral part cooperate the use of check valve, form by interior and outer gas suspension structure.

2. The expansion piston is internally provided with nine-hole cotton, so that the expansion piston has a better ventilation effect.

3. The cold energy can be concentrated at the top by the gas flowing mode from inside to outside.

4. The utility model discloses set up in the power piston lateral wall and supply the gas circuit structure, reinforcing gas circuit circulation skill possesses better ventilation effect, reaches better gas suspension effect.

5. The coil is different from the winding mode of the traditional coil, realizes sound energy transmission by combining the winding mode of the horn coil, has good effect, can ensure that the power piston achieves ideal amplitude on the linear reciprocating motion, and ensures the refrigeration effect.

6. The utility model discloses coil structure can be fixed with the frame through coil structure mount, and on the connection setting of structure, stability is high.

7. The utility model discloses the frame is connected with external solid fixed ring through cyclic annular connecting portion and connection convex part, and the shell is connected through casing fixed platform in the lower part, and the design in two-channel gomphosis groove is adopted on upper portion, connects more stably, and this device all adopts the vacuum welding when connecting simultaneously, and whole sealed effectual.

8. The heat dissipation part adopts the red copper heat dissipation part, and the heat dissipation effect is good.

Drawings

FIG. 1 is a schematic sectional view of the structure of the present invention;

FIG. 2 is a schematic view of the expansion piston assembly of the present invention;

fig. 3 is a sectional view of the expansion piston structure of the present invention;

FIG. 4 is a schematic view of a communicating hole cylinder structure;

FIG. 5 is a schematic view of an expansion piston configuration;

FIG. 6 is a schematic view of a power piston assembly of the present invention;

figure 7 is a cross-sectional view of the power piston assembly of the present invention;

FIG. 8 is a schematic view of a coil configuration;

FIG. 9 is a schematic cross-sectional view of a coil structure;

FIG. 10 is a front view of the housing;

FIG. 11 is a top view of the housing;

FIG. 12 is a schematic bottom view of the stand;

FIG. 13 is a schematic view of the external retaining ring;

FIG. 14 is a cross-sectional view of the external retaining ring.

Detailed Description

The invention will be further described with reference to the following drawings and examples:

example 1:

a thermoacoustic refrigerator, refer to the attached figures 1-14, comprises a machine base 1, and an expansion piston assembly 2 and a power piston assembly 3 which are respectively arranged on the upper side and the lower side of the machine base, wherein a coil structure 4 is arranged at the outer side end of the power piston assembly 3, the upper side of the machine base 1 is connected with a vacuum tank through an external fixing ring to form the sealing of the expansion piston assembly 2, the lower side of the machine base is connected with a shell 6 to form the sealing of the power piston assembly 3 and the coil structure 4, and the bottom side of the shell 6 is also connected with.

Specifically, referring to the attached figure 2-4, the expansion piston assembly 2 comprises a head tank 2-1 and an expansion piston 2-2 which can reciprocate and is coaxially suspended in the head tank, the upper part of the head tank 2-1 is connected with a cover body 2-11, the lower part of the head tank is connected with a communication hole cylinder 2-3, the expansion piston 2-2 comprises a hollow expansion piston body 2-21 and a hollow seat body 2-22 connected with the bottom of the hollow expansion piston body, and a first air inlet one-way valve 2-4 is arranged in the space between the hollow expansion piston body 2-21 and the hollow seat body 2;

the bottom of the hollow seat body 2-22 is provided with a piston rod 2-23;

the top side of the expansion piston body 2-21 is circumferentially provided with first through holes 2-24, and the upper side and the lower side in the expansion piston body are both provided with heat absorption fins 2-25;

the middle part of the hollow seat body 2-22 is circumferentially provided with second through holes 2-26, and the bottom part is circumferentially provided with third through holes 2-27;

the power piston assembly 3 comprises a power piston body 3-1, a hollow expansion piston channel column 3-11 is arranged in the power piston body 3-1, an air inlet one-way valve 3-12 is arranged at the top of the expansion piston channel column 3-11 and communicated with an air chamber space 3-13 between the expansion piston channel column 3-11 and the power piston body 3-1, a plurality of first air channel 3-15 which are uniformly distributed and arranged on the circumference of the power piston body 3-1 are communicated with the air chamber space 3-13, and a supplementary air channel 3-2 is also arranged between the top of the power piston body 3-1 and the circumference;

the bottom side of the power piston body 3-1 is coaxially provided with an elastic piece fixing structure 3-17 with the expansion piston channel column 3-11, the elastic piece fixing structure is a threaded groove body and is communicated with the expansion piston channel column 3-11, the piston rod 2-23 penetrates through the expansion piston channel column 3-11 and the elastic piece fixing structure 3-17 at the same time and is connected with a first elastic piece 100 at the bottom, the elastic piece fixing structure 3-17 is connected with a second elastic piece 200, and a bearing piece 300 is arranged between the first elastic piece 100 and the second elastic piece 200.

Specifically, a cover body connected with the upper part of the head tank is matched with a communication hole cylinder connected with the lower part of the head tank to be used as an expansion chamber main body, and the expansion chamber main body is also a main body structure of the reciprocating motion of an expansion piston.

The first through holes, the second through holes and the third through holes are uniformly distributed.

The communicating hole cylinder is provided with an air groove which is opposite to the second communicating hole to form an air inlet end for gas circulation in the closed chamber.

Furthermore, hole grooves are formed in the circumferential direction of the heat absorbing fins 2-25 on the top and communicated with the first through holes 2-24, air grooves 2-31 are formed in the communicating hole air cylinder 2-3, nine-hole cotton is arranged between the two heat absorbing fins 2-25 on the inner side of the expansion piston body 2-21, and the cover body 2-11 is a copper head cover body

In the formation of the air film, air enters from the second through hole, upwards passes through the air inlet one-way valve, passes through the interior of the expansion piston body, sequentially passes through the heat absorption fins and the nine-hole cotton in the expansion piston body, and flows out from the upper first through hole and the top heat absorption fins, and then forms an air suspension state downwards between the head tank and the expansion piston body.

Meanwhile, gas enters the hollow seat body from the second through hole and flows out of the third through hole downwards, and a gas suspension state is formed between the hollow seat body and the communicating hole cylinder upwards.

The gas suspension state can replace a copper sheet regenerator.

Preferably, the cover body is a copper head cover body, the cover body is used as a heat absorption device, the copper head cover body is better in effect, and the cold energy can be concentrated through the air flotation circulation from inside to outside.

And on the power piston air-floating structure, the top of the expansion piston channel column is provided with a first air inlet one-way valve communicated with an air chamber space between the expansion piston channel column and the power piston body.

Namely, the first air inlet one-way valve is used as an air inlet of the power piston to introduce air into the air chamber space.

A plurality of first air passage channels are uniformly distributed and arranged on the circumference of the power piston body up and down and communicated with the air chamber space, namely, the first air passage through holes lead out the air in the air chamber space, and the air in the air chamber space is led into the air chamber space from the first air inlet one-way valve after going upwards from the outer wall of the power piston body in the air cylinder, so that an air floatation structure is formed between the power piston body and the air cylinder.

In this embodiment, the first gas passage is provided in two rows, and the number of the single rows provided along the circumferential side is 4.

And in the continuous movement process of the power piston body, the air flotation layer continuously exists.

Meanwhile, in order to further ensure the air floatation effect, the supplementary air path 3-2 comprises a plurality of second air path through holes 3-21 arranged on the top end surface of the power piston body 3-1 and a plurality of third air path through holes 3-22 arranged on the circumferential surface of the power piston body 3-1, an air path pipeline 3-23 is positioned inside the side wall of the power piston body 3-1 and is not communicated with the air chamber space 3-13, and a base body 3-16 is arranged at the bottom side of the power piston body 3-1.

In this embodiment, the number of the second air passage through holes is 2, and the number of the third air passage through holes correspondingly arranged in a single second air passage through hole is 2.

And gas enters from the second gas path through hole and is discharged from the third gas path through hole, so that gas path circulation of air floatation is formed.

In the coil structure of the structure, the coil structure 4 comprises a coil frame body 4-1, a magnetic ring 4-2 and an iron ring 4-3 from outside to inside.

The coil 4-4 is wound on the coil frame body 4-1, the coil 4-4 is wound on the coil frame body 4-1 from inside to outside, 18 coils are wound in a single layer, and 3 layers are wound.

The lower side end of the coil 4-4 is also provided with a coil structure fixing frame 4-5, and a lining ring 4-6 is arranged between the magnetic ring 4-2 and the iron ring 4-3.

The coil structure fixing frame 4-5 is connected with the coil fixing platform 1-13 on the base to form a fixed state.

The connection of the upper side and the lower side of the structure is realized through the engine base and the external fixing ring, and the engine base 1 comprises an engine base body 1-1 and a power piston cylinder 1-2 connected with the engine base body 1-1.

The engine base body 1-1 is of a cylindrical cover body structure, the interior of the engine base body is hollow, the top of the engine base body is provided with a connecting convex part 1-3, the edge of the engine base body 1-1 is a platform part 1-11, and the lower side of the platform part 1-11 is provided with a shell fixing platform 1-12 and a coil fixing platform 1-13 in a step shape.

The power piston assembly 3 is arranged in the power piston cylinder 1-2, the iron ring 4-3 is sleeved outside the power piston cylinder 1-2, and the coil structure fixing frame 4-5 is fixedly connected with the coil fixing platform 1-13

The power piston cylinder 1-2 is fixed on the inner side surface of the machine base body 1-1 from bottom to top through a connecting ring 1-21 on the outer side surface of the power piston cylinder 1-2, the power piston cylinder 1-2 penetrates through the hollow structure of the machine base body 1-1 to form an annular connecting part 1-22 at the top, and the connecting convex part 1-3 comprises a first connecting convex part 1-31 and a second connecting convex part 1-32 which are concentrically and annularly arranged and are positioned at the outer side end of the annular connecting part 1-22.

The external fixed ring 5 comprises a connecting part 5-1 on the upper side and a heat dissipation part 5-2 on the lower side, the connecting part 5-1 and the heat dissipation part 5-2 are coaxially arranged, and the connecting part and the heat dissipation part are both of cylindrical structures with hollow interiors.

The top of the connecting part 5-1 is provided with a connecting flange 5-11, and the top of the connecting flange 5-11 is internally provided with a secondary bearing platform 5-12 in a stepped manner.

The heat dissipation part 5-2 is a red copper heat dissipation part, a fixed bearing platform 5-21 arranged circumferentially on the inner side of the upper part is fixedly connected with the lower side of the connecting part 5-1, an embedding groove 5-3 is arranged on the lower side of the heat dissipation part 5-2, the embedding groove 5-3 comprises a first embedding groove 5-31 and a second embedding groove 5-32, and the first embedding groove 5-31 and the second embedding groove 5-32 are matched and fixed with the first connecting convex part 1-31 and the second connecting convex part 1-32.

The frame is connected with external solid fixed ring through cyclic annular connecting portion and connection convex part, and the shell is connected through casing fixed platform in the lower part, and the design in two-channel gomphosis groove is adopted on upper portion, connects more stably, and this device all adopts the vacuum welding when connecting simultaneously, and whole sealed effectual.

The coil structure can be fixed with the frame through the coil structure mount, and is high in stability in the connection setting of structure.

To explain further by combining the working mechanism, when the coil is electrified, the coil structure generates a magnetic field, so that the power piston moves along the axial reciprocating motion of the power piston, the expansion piston moves along with the motion of the power piston under the action of pressure difference, and when the pressure is changed in an isobaric manner, the adjacent part of the expansion chamber at the cover body is in a low-temperature state, and the adjacent part of the chamber at the dispersion part is in a high-temperature state.

The reciprocating motion of the expansion piston and the power piston can generate vibration, the damping device at the bottom plays a role, the balancing weight is arranged at the middle part of the damping assembly, the connecting piece penetrates through the central position of the damping elements (disc springs) arranged up and down to arrange the balancing weight 3 between the two, and meanwhile, the damping shell is connected with the shell to form a resonance structure and is coaxial with the axis of the reciprocating motion of the vibration axis.

In addition, the balancing weight is a disc-shaped metal block and is a conical balancing weight with the middle protruding to the two sides being inclined planes, the diameter of the damping element is larger than that of the balancing weight, so that a sandwich structure is formed by matching the damping shell, resonance of the balancing weight and a thermoacoustic motor shell is realized at the center of the balancing weight, vibration is absorbed, and a better damping effect is achieved.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements.

The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Those skilled in the art will readily appreciate that the above-described preferred embodiments may be freely combined, superimposed, without conflict.

It will be understood that the above-described embodiments are illustrative only and not restrictive, and that various obvious and equivalent modifications and substitutions may be made in the details described herein by those skilled in the art without departing from the basic principles of the invention.

Claims (9)

1. A thermoacoustic refrigerator is characterized in that: the device comprises a machine base (1), and an expansion piston assembly (2) and a power piston assembly (3) which are respectively arranged on the upper side and the lower side of the machine base, wherein a coil structure (4) is arranged at the outer side end of the power piston assembly (3), the upper side of the machine base (1) is connected with a vacuum tank through an external fixing ring (5) to form a seal for the expansion piston assembly (2), the lower side of the machine base is connected with a shell (6) to form a seal for the power piston assembly (3) and the coil structure (4), and the bottom side of the shell (6) is also connected with a damping assembly (7);

the expansion piston assembly (2) comprises a head tank (2-1) and an expansion piston (2-2) which can reciprocate and is coaxially suspended in the head tank, the upper part of the head tank (2-1) is connected with a cover body (2-11), the lower part of the head tank is connected with a communication hole cylinder (2-3), the expansion piston (2-2) comprises a hollow expansion piston body (2-21) and a hollow seat body (2-22) connected with the bottom of the hollow expansion piston body, and a first air inlet one-way valve (2-4) is arranged between the hollow expansion piston body and the hollow seat body;

the bottom of the hollow seat body (2-22) is provided with a piston rod (2-23);

the top side of the expansion piston body (2-21) is circumferentially provided with first through holes (2-24), and the upper side and the lower side in the expansion piston body are both provided with heat absorption fins (2-25);

the middle part of the hollow seat body (2-22) is circumferentially provided with a second through hole (2-26), and the bottom part is circumferentially provided with a third through hole (2-27);

the power piston assembly (3) comprises a power piston body (3-1), a hollow expansion piston channel column (3-11) is arranged in the power piston body (3-1), an air inlet one-way valve (3-12) is arranged at the top of the expansion piston channel column (3-11) and communicated with an air chamber space (3-13) between the expansion piston channel column (3-11) and the power piston body (3-1), a plurality of first air passage channels (3-15) are uniformly distributed and arranged on the circumference of the power piston body (3-1) up and down and communicated with the air chamber space (3-13), and a supplementary air passage (3-2) is arranged between the top of the power piston body (3-1) and the circumference;

the bottom side of the power piston body (3-1) is coaxially provided with an elastic piece fixing structure (3-17) with the expansion piston channel column (3-11), the elastic piece fixing structure is a threaded groove body and communicated with the expansion piston channel column (3-11), the piston rod (2-23) penetrates through the expansion piston channel column (3-11) and the elastic piece fixing structure (3-17) at the same time and is connected with a first elastic piece (100) at the bottom, the elastic piece fixing structure (3-17) is connected with a second elastic piece (200), and a bearing piece (300) is arranged between the first elastic piece (100) and the second elastic piece (200).

2. The thermoacoustic refrigerator according to claim 1, wherein: the coil structure (4) comprises a coil frame body (4-1) from outside to inside, a magnetic ring (4-2) and an iron ring (4-3), wherein the coil (4-4) is wound on the coil frame body (4-1), the coil (4-4) is wound on the coil frame body (4-1) from inside to outside, 18 coils are wound in a single layer and 3 layers are wound, a coil structure fixing frame (4-5) is further arranged at the lower side end of the coil (4-4), and a lining ring (4-6) is arranged between the magnetic ring (4-2) and the iron ring (4-3).

3. The thermoacoustic refrigerator according to claim 2, wherein: the engine base (1) comprises an engine base body (1-1) and a power piston cylinder (1-2) connected with the engine base body (1-1), the engine base body (1-1) is of a cylindrical cover body structure, the interior of the engine base body is hollow, a connecting convex portion (1-3) is arranged at the top of the engine base body, the edge of the engine base body (1-1) is a platform portion (1-11), and the lower side of the platform portion (1-11) is in a step shape and is provided with a shell fixing platform (1-12) and a coil fixing platform (1-13).

4. A thermoacoustic refrigerator according to claim 3, wherein: the power piston assembly (3) is arranged in the power piston cylinder (1-2), the iron ring (4-3) is sleeved on the outer side of the power piston cylinder (1-2), and the coil structure fixing frame (4-5) is fixedly connected with the coil fixing platform (1-13).

5. A thermoacoustic refrigerator according to claim 3, wherein: the power piston cylinder (1-2) is fixed on the inner side surface of the machine base body (1-1) from bottom to top through a connecting ring (1-21) on the outer side surface of the power piston cylinder, the power piston cylinder (1-2) penetrates through the hollow structure of the machine base body (1-1) to form an annular connecting part (1-22) at the top, the connecting convex part (1-3) comprises a first connecting convex part (1-31) and a second connecting convex part (1-32) which are concentrically and annularly arranged, and the first connecting convex part and the second connecting convex part are located at the outer side end of the annular connecting part (1-22).

6. The thermoacoustic refrigerator according to claim 5, wherein: the external fixed ring (5) comprises a connecting part (5-1) on the upper side and a heat dissipation part (5-2) on the lower side, the connecting part (5-1) and the heat dissipation part (5-2) are coaxially arranged and are both of cylindrical structures with hollow interiors, a connecting flange (5-11) is arranged at the top of the connecting part (5-1), a secondary bearing platform (5-12) is arranged at the top of the connecting flange (5-11) in a stepped manner inwards, a fixed bearing platform (5-21) circumferentially arranged at the inner side of the upper part of the heat dissipation part (5-2) is fixedly connected with the lower side of the connecting part (5-1), a tabling groove (5-3) is arranged at the lower side of the heat dissipation part (5-2), the tabling groove (5-3) comprises a first tabling groove (5-31) and a second tabling groove (5-32), the two are matched and fixed with the first connecting convex parts (1-31) and the second connecting convex parts (1-32).

7. The thermoacoustic refrigerator according to claim 2, wherein: the supplementary gas circuit (3-2) comprises a plurality of second gas circuit through holes (3-21) arranged on the top end face of the power piston body (3-1) and a plurality of third gas circuit through holes (3-22) arranged on the circumferential face of the power piston body (3-1), a gas circuit pipeline (3-23) is positioned in the side wall of the power piston body (3-1) and is not communicated with the gas chamber space (3-13), and a base body (3-16) is arranged on the bottom side of the power piston body (3-1).

8. The thermoacoustic refrigerator according to claim 1, wherein: hole grooves are formed in the circumferential direction of the heat absorption fins (2-25) on the top of the expansion piston body and communicated with the first through holes (2-24), air grooves (2-31) are formed in the communication hole air cylinder (2-3), nine-hole cotton is arranged between the two heat absorption fins (2-25) on the inner side of the expansion piston body (2-21), and the cover body (2-11) is a copper head cover body.

9. The thermoacoustic refrigerator according to claim 6, wherein: the heat dissipation part (5-2) is a red copper heat dissipation part.

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