Flexible film in thermo-acoustic heat pump and thermo-acoustic heat pump device

Abstract

The utility model discloses a flexible film in a thermo-acoustic heat pump and a thermo-acoustic heat pump device, and the flexible film is an elastic film unit and comprises a support and an elastic film. The flexible film is a rubber elastic film unit, and a round hole is formed in the center of the top of the flexible film. When the device is applied to the containing cavity of the thermo-acoustic heat pump, a gas medium in the device flows and vibrates back and forth in the circulating pipe of the thermo-acoustic heat pump, so that the elastic film is driven to vibrate in the cavity of the support, mechanical energy is converted to generate part of heat energy, and the temperature in the containing cavity of the thermo-acoustic heat pump is increased; and the use efficiency of the thermo-acoustic heat pump is further improved. In addition, the utility model also discloses a sine wave elastic film which comprises a central structure, a sine wave-shaped structure and a peripheral structure. The sine wave elastic film is installed in the containing cavity, so that Gedeon acoustic streaming in the thermo-acoustic heat pump system can be restrained, and the overall performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of thermoacoustics, in particular to a flexible film in a thermoacoustic heat pump and a thermoacoustic heat pump device. Background Art

[0002] The thermoacoustic effect, a phenomenon in which sound energy is converted to heat energy, is primarily used in thermoacoustic heat engines. Based on the form of energy conversion, thermoacoustic heat engines can be divided into two types: a forward cycle thermoacoustic engine that converts heat energy into sound energy, and a reverse cycle thermoacoustic heat pump that consumes sound energy to transfer heat energy from a low-temperature area to a high-temperature area.

[0003] Compared with traditional heat engines, thermoacoustic heat engines, as a new type of external combustion heat engine, have a simple structure, no mechanical moving parts, strong reliability, and long service life. The working medium is safe gases such as air, nitrogen or inert gas that will not damage the ozone layer, which is very environmentally friendly. In addition, the thermoacoustic heat engine has a wide operating temperature range and good heat source adaptability. It can effectively utilize various low-grade heat sources such as solar energy and industrial waste gas waste heat. Therefore, in today's increasingly severe environmental and energy problems, thermoacoustic heat engines have broad application prospects.

[0004] Based on the different phase relationships between the pressure fluctuations of sound and the volume flow rate in the regenerator, thermoacoustic heat engines can be divided into two types: standing wave type heat engines and traveling wave type heat engines. In standing wave type thermoacoustic heat engines, there is a 90-degree phase difference between the pressure fluctuations of sound and the volume flow rate in the regenerator, while in traveling wave type thermoacoustic heat engines, there is no phase difference between the pressure fluctuations of sound and the volume flow rate in the regenerator. A traveling wave thermoacoustic heat engine is one in which traveling waves are the primary component of the sound field in the regenerator. The thermodynamic cycle of a traveling wave thermoacoustic engine is similar to the Stirling cycle, and it has the advantage of being a quasi-static equilibrium process, resulting in a relatively high efficiency in thermoacoustic conversion. In recent years, traveling wave thermoacoustic engines have received increasing attention in the field of thermoacoustic research.

[0005] However, there are several acoustic flows in traveling wave thermoacoustic heat engines that exceed the Rott theory. The existence of acoustic flows will cause unnecessary energy loss to the thermoacoustic heat engine. The most important loss comes from the Gedeon acoustic flow. In order to improve the efficiency of energy conversion in the thermoacoustic heat engine, the existence of this acoustic flow should be avoided as much as possible. Utility Model Content

[0006] The purpose of the utility model is to provide a flexible film in a thermoacoustic heat pump and a thermoacoustic heat pump device, so as to suppress the Gedeon acoustic flow inside the thermoacoustic heat pump system, reduce the heat loss of the thermoacoustic heat pump, and improve the overall performance.

[0007] To achieve the above-mentioned object, on the one hand, the present invention provides a flexible film in a thermoacoustic heat pump, wherein the flexible film is an elastic film unit, and the elastic film unit includes a bracket and an elastic film;

[0008] The bracket includes a round bottom bracket and six curved brackets with the same curvature;

[0009] The bottom of the curved bracket is mounted on the round bottom bracket; the tops of the curved brackets converge at one point and are distributed in a symmetrical structure;

[0010] The elastic film is coated on the curved bracket;

[0011] The elastic film is provided with a circular hole.

[0012] Furthermore, in the flexible film in the thermoacoustic heat pump, the elastic film is made of rubber.

[0013] Furthermore, in the flexible film of the thermoacoustic heat pump, the diameter of the circular hole ranges from 0.5 mm to 3 mm.

[0014] Furthermore, in the flexible film in the thermoacoustic heat pump, the bracket is a hollow structure formed by a combination of rigid materials, and the rigid material includes stainless steel, beryllium copper or aluminum alloy.

[0015] In addition, in another aspect of the present invention, a flexible film in a thermoacoustic heat pump is provided, wherein the flexible film is a sinusoidal corrugated elastic film;

[0016] The sinusoidal corrugated elastic film comprises a central structure, a sinusoidal wave structure and a peripheral structure;

[0017] The peripheral structure is connected to the central structure via the sinusoidal structure;

[0018] The sinusoidal corrugated elastic film structure is a centrally symmetrical structure.

[0019] Furthermore, in the flexible film in the thermoacoustic heat pump, the material of the sinusoidal corrugated elastic film is beryllium copper.

[0020] Furthermore, in the flexible film in the thermoacoustic heat pump, the thickness of the sinusoidal corrugated elastic film is in the range of 0.5 mm to 2.5 mm.

[0021] Furthermore, in the flexible film in the thermoacoustic heat pump, the sinusoidal wave structure has crests and troughs, and the peak values of the crests and troughs range from 1 mm to 4 mm.

[0022] Furthermore, in the flexible film in the thermoacoustic heat pump, the width of the sinusoidal wave structure ranges from 1 mm to 10 mm.

[0023] In addition, the present invention also proposes a thermoacoustic heat pump device, comprising a cavity and the flexible film in the thermoacoustic heat pump as described above, wherein the flexible film is installed inside the cavity.

[0024] Compared with the prior art, the present invention has at least the following beneficial effects:

[0025] The proposed elastic film unit consists of an elastic film and a bracket. The bracket includes a round bottom bracket and six curved brackets with the same curvature. The bottom of the curved bracket is installed on the round bottom bracket. The tops of the curved brackets converge at one point and are distributed in a symmetrical structure. The bracket with this structure has strong stability, and the bracket with this structure also forms a cavity to sleeve the elastic film on the curved bracket. When it is applied to the cavity of the thermoacoustic heat pump, the gas medium inside it flows back and forth and vibrates in the circulation pipe of the thermoacoustic heat pump, thereby driving the elastic film to vibrate in the cavity of the bracket, and then part of the heat energy is converted from mechanical energy to generate part of the heat energy, thereby increasing the temperature in the cavity of the thermoacoustic heat pump, so as to further improve the utilization efficiency of the thermoacoustic heat pump.

[0026] Furthermore, a circular hole at the center of the elastic membrane allows for the passage of a small amount of fluid particles, thereby balancing the pressure within the chamber, extending the membrane's service life and improving the efficiency of the thermoacoustic heat pump system. When the fluid particles squeeze the membrane, the membrane effectively converts some of their kinetic energy into stored elastic potential energy, while also efficiently releasing this stored elastic potential energy to the fluid particles, significantly enhancing the overall operational efficiency of the thermoacoustic heat pump.

[0027] Furthermore, a sinusoidal corrugated elastic film with a sinusoidal wave structure is proposed. Due to its sinusoidal wave structure, it itself has a certain elasticity. As mentioned above, it is applied to the cavity of the thermoacoustic heat pump. The gas medium inside it flows back and forth and vibrates in the circulation pipe of the thermoacoustic heat pump, thereby driving the sinusoidal corrugated elastic film to vibrate in the cavity of the bracket, and then part of the mechanical energy is converted into thermal energy, thereby increasing the temperature in the cavity of the thermoacoustic heat pump, thereby further improving the efficiency of the thermoacoustic heat pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of the elastic film unit in Example 1 of the present utility model;

[0029] Figure 2 This is a structural diagram of the elastic film unit installed in the cavity in the first embodiment of the present invention;

[0030] Figure 3 This is a top view of the beryllium copper sinusoidal corrugated elastic film in Example 2 of the present utility model;

[0031] Figure 4 This is a cross-sectional view of the beryllium copper sinusoidal corrugated elastic film in Example 2 of the present utility model;

[0032] Figure 5 This is a structural diagram of the beryllium copper sinusoidal corrugated elastic film installed in the cavity in the second embodiment of the present invention. DETAILED DESCRIPTION

[0033] The following is a more detailed description of the flexible membrane and thermoacoustic heat pump device in the thermoacoustic heat pump of the present invention, with reference to schematic diagrams. These diagrams illustrate preferred embodiments of the present invention. It should be understood that those skilled in the art may modify the present invention described herein while still achieving the beneficial effects of the present invention. Therefore, the following description should be understood as a general guide for those skilled in the art and not as a limitation of the present invention.

[0034] The following paragraphs describe the present invention in more detail by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are greatly simplified and not to exact scale, and are intended solely to facilitate and clearly illustrate the embodiments of the present invention.

[0035] Example 1

[0036] like Figure 1 As shown, in the embodiment, a flexible film in a thermoacoustic heat pump is proposed. Specifically, the flexible film is an elastic film unit. The elastic film unit includes a bracket 1 and an elastic film 2.

[0037] Specifically, the bracket 1 comprises a round-bottom bracket 1-1 and six curved brackets 1-2 with the same curvature. The tops of the curved brackets 1-2 intersect at a point, forming a symmetrical structure. The bottoms are mounted on the round-bottom bracket 1-1. This structure improves the stability of the bracket 1. The tops of the multiple curved brackets 1-2 intersect at a point to form a hemispherical cavity. The six curved brackets 1-2 with the same curvature form a hollow structure, facilitating the subsequent vibration of the elastic membrane 2 within the hollow structure.

[0038] In a specific example, the elastic film 2 is wrapped around the curved bracket 1-2 to form a rubber elastic film unit and is fixedly connected to the round bottom bracket 1-1. The elastic film 2 is provided with a circular hole (not shown). Preferably, the circular hole can be located at the top center of the elastic film 2. The diameter of the circular hole is 0.5 mm to 3 mm, preferably 1 mm, 1.5 mm, or 2 mm.

[0039] The elastic film 2 may be made of rubber. Those skilled in the art will also appreciate that, in addition to rubber, other materials with a certain elasticity may also be used as the elastic film 2 .

[0040] In this embodiment, the bracket 1 - 1 is a hollow structure formed by a combination of rigid materials, and the rigid materials include stainless steel, beryllium copper or aluminum alloy.

[0041] Please refer to Figure 2 In another aspect of this embodiment, a thermoacoustic heat pump device is provided, including a cavity 4. In addition, the elastic film unit described above is applied to the cavity of the thermoacoustic heat pump device to improve energy conversion efficiency.

[0042] Specifically, the elastic film unit can be installed in the cavity 4 of the thermoacoustic heat pump device. When the gas medium in the thermoacoustic heat pump device performs work back and forth in the circulation pipe, the circular hole of the elastic film 2 can balance the air pressure on the left and right sides of the flexible film.

[0043] Because the thermoacoustic heat pump device utilizes thermoacoustic technology to generate heat energy, and the gas reciprocates within cavity 4, heat loss occurs within the gas molecules during this reciprocating motion. The addition of the elastic film unit can better convert some of the kinetic energy of the fluid clusters into stored elastic potential energy, while also efficiently releasing this stored elastic potential energy to the fluid clusters. When the thermoacoustic heat pump device is operating, the internal gas medium flows back and forth and vibrates within the thermoacoustic heat pump's circulation tube, thereby driving the elastic film 2 to vibrate within the cavity of the bracket 1. This, in turn, converts mechanical energy into some thermal energy, raising the temperature within cavity 4 of the thermoacoustic heat pump device, further improving the device's efficiency.

[0044] When the thermoacoustic heat pump device is working, the elastic film 2 can convert the sound wave energy into compression work and eliminate the Gedeon acoustic direct current, reducing the energy loss caused by convective heat transfer, thereby improving the efficiency of the thermoacoustic heat pump device.

[0045] In addition, a circular hole is provided on the top of the elastic film 2 . The circular hole can balance the air pressure in the cavity 4 and protect the film, thereby increasing the service life of the elastic film 2 .

[0046] Example 2

[0047] like Figure 3-Figure 5 As shown, the embodiment of the present invention proposes a flexible film in a thermoacoustic heat pump. Different from the first embodiment, the flexible film in this embodiment is a sinusoidal corrugated elastic film 3.

[0048] Specifically, the sinusoidal corrugated elastic membrane 3 comprises a central structure 3-3, a sinusoidal wave structure 3-2, and a peripheral structure 3-1. The peripheral structure 3-1 is connected to the central structure 3-3 via the sinusoidal wave structure 3-2. The sinusoidal corrugated elastic membrane 3 is centrosymmetrical. This structure effectively resonates with sound waves, effectively increasing the elasticity and resonance of the sinusoidal corrugated elastic membrane 3. Furthermore, the sinusoidal corrugated elastic membrane 3 is elastic and can adapt well to pressure changes within the chamber 4.

[0049] The sinusoidal corrugated elastic film 3 can also convert the acoustic wave energy into compression work and eliminate the Gedeon acoustic direct current, thereby reducing the energy loss caused by convective heat transfer, thereby improving the cooling or heating efficiency of the thermoacoustic heat pump device.

[0050] The sinusoidal wave structure 3-2 has peaks and troughs, with the peaks and troughs ranging from 1 mm to 4 mm, preferably 2 mm or 3 mm. The thickness of the sinusoidal corrugated elastic film 3 ranges from 0.5 mm to 2.5 mm, preferably 1 mm or 2 mm. The width of the sinusoidal wave structure 3-2 ranges from 1 to 10 mm, for example, 2 mm, 3 mm, 5 mm, or 8 mm. The sinusoidal corrugated elastic film 3 is made of beryllium copper, which has good ductility and is easy to stamp and produce into a beryllium copper elastic film 3 with sinusoidal corrugations. The thickness of the sinusoidal corrugated elastic film ranges from 0.5 mm to 2.5 mm.

[0051] In addition, in another aspect of this embodiment, a thermoacoustic heat pump device is also proposed. The thermoacoustic heat pump device includes a cavity 4 and a sinusoidal corrugated elastic film 3 .

[0052] Specifically, the sinusoidal corrugated elastic membrane 3 can be installed in the cavity 4 of the thermoacoustic heat pump device. Because the sinusoidal corrugated elastic membrane 3 has a sinusoidal wave structure 3-2, it inherently possesses a certain degree of elasticity. As described in Example 1, the gaseous medium within the thermoacoustic heat pump device vibrates back and forth in the circulation tube, thereby driving the sinusoidal corrugated elastic membrane 3 to vibrate in the cavity 4. This, in turn, converts some mechanical energy into thermal energy, raising the temperature in the cavity 4 and further improving the efficiency of the thermoacoustic heat pump device. Furthermore, the sinusoidal wave structure 3-2 enhances the resonance between the sinusoidal corrugated elastic membrane 3 and sound waves, further improving the performance of the thermoacoustic heat pump device.

[0053] When the thermoacoustic heat pump device is working, the sinusoidal corrugated elastic film 3 can convert the acoustic wave energy into compression work and eliminate the Gedeon acoustic direct current, reducing the energy loss caused by convective heat transfer, thereby improving the cooling efficiency of the thermoacoustic heat pump device.

[0054] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A flexible film in a thermoacoustic heat pump, characterized in that: The flexible film is an elastic film unit, and the elastic film unit includes a bracket and an elastic film; The bracket includes a round bottom bracket and six curved brackets with the same curvature; The bottom of the curved bracket is mounted on the round bottom bracket; the tops of the curved brackets converge at one point and are distributed in a symmetrical structure; The elastic film is coated on the curved bracket; The elastic film is provided with a circular hole.

2. The flexible film in the thermoacoustic heat pump according to claim 1, characterized in that The elastic film is made of rubber.

3. The flexible film in the thermoacoustic heat pump according to claim 1, characterized in that The diameter of the circular hole ranges from 0.5 mm to 3 mm.

4. The flexible film in the thermoacoustic heat pump according to claim 1, characterized in that The bracket is a hollow structure formed by combining rigid materials, and the rigid materials include stainless steel, beryllium copper or aluminum alloy.

5. A flexible film in a thermoacoustic heat pump, characterized in that: The flexible film is a sinusoidal corrugated elastic film; The sinusoidal corrugated elastic film comprises a central structure, a sinusoidal wave structure and a peripheral structure; The peripheral structure is connected to the central structure via the sinusoidal structure; The sinusoidal corrugated elastic film structure is a centrally symmetrical structure.

6. The flexible film in the thermoacoustic heat pump according to claim 5, characterized in that The material of the sinusoidal corrugated elastic film is beryllium copper.

7. The flexible film in the thermoacoustic heat pump according to claim 5, characterized in that The thickness of the sinusoidal corrugated elastic film ranges from 0.5 mm to 2.5 mm.

8. The flexible film in the thermoacoustic heat pump according to claim 5, characterized in that: The sinusoidal wave structure has crests and troughs, and the peak values of the crests and troughs range from 1 mm to 4 mm.

9. The flexible film in the thermoacoustic heat pump according to claim 5, characterized in that The width of the sinusoidal wave structure ranges from 1 mm to 10 mm.

10. A thermoacoustic heat pump device, characterized in that: The thermoacoustic heat pump comprises a cavity and a flexible film as claimed in any one of claims 1 to 9, wherein the flexible film is installed inside the cavity.

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