Loop structure in thermo-acoustic heat pump device

Abstract

The utility model discloses a loop structure in a thermo-acoustic heat pump device. The loop structure comprises a first ring pipe (1), a first short section (2), a second ring pipe (3) and a second short section (4), the first ring pipe (1) and the second ring pipe (3) are arc-shaped pipelines; the first short section (2) and the second short section (4) are straight pipelines; one end of the first ring pipe (1) is connected with a core cabin (5), and the other end of the first ring pipe (1) is connected with one end of the first short section (2); the other end of the first short section (2) is connected with one end of the second ring pipe (3); the other end of the second ring pipe (3) is connected with one end of the second short section (4); and the other end of the second short section (4) is connected with the accommodating cavity (6). The thermo-acoustic heat pump device is applied to a thermo-acoustic heat pump loop and is mainly used for transferring thermo-acoustic waves, generating resonance and improving the efficiency of the thermo-acoustic heat pump device.

Description

Technical Field

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

[0002] The thermoacoustic heat pump device includes a traveling-wave thermoacoustic engine, which is a device that utilizes the thermoacoustic effect to achieve thermoacoustic conversion and thus achieve acoustic power output. For a traveling-wave thermoacoustic engine, its thermodynamic cycle process is similar to the Stirling cycle, and it has the advantage of a quasi-static equilibrium process. Therefore, the efficiency of thermoacoustic conversion is relatively high. The highest thermal efficiency obtained by a traveling-wave thermoacoustic engine in the laboratory has reached 36%, and this thermal efficiency can be comparable to that of an internal combustion engine. Compared with traditional heat engine technologies, thermoacoustic technology has the following prominent advantages and development potential: 1. High reliability. Both thermoacoustic engines and thermoacoustic refrigerators have no moving parts, and their compression and expansion processes are completely realized by the increase and decrease of sound waves themselves; 2. High efficiency. Due to fewer mechanical moving parts, the energy loss caused by mechanical losses in conventional heat engines is reduced in thermoacoustic engines; 3. Environmentally friendly. Since there is no combustion process, no harmful gas emissions are generated, which is friendly to the environment; 4. Long service life, simple production and manufacturing, and low production cost; 5. It can continuously improve the potential efficiency. In the context of the shortage of fossil energy and environmental deterioration, using clean new energy such as solar energy for thermoacoustic power generation has great commercial value and social significance.

[0003] The annular pipeline plays an important role in the thermoacoustic heat pump device. It connects all the units in the thermoacoustic heat pump device to form a closed loop. Therefore, thermoacoustic waves continuously propagate in the closed loop, thereby achieving efficient thermoacoustic conversion. In addition, experiments have proved that under certain conditions, the thermoacoustic heat pump device in the annular pipeline can achieve self-sustained oscillation. The thermoacoustic heat pump device refers to a thermoacoustic heat engine in which the traveling wave accounts for the main component of the sound field in the regenerator. For the thermoacoustic heat pump device, its thermodynamic cycle process is similar to the Stirling cycle, and it has the advantage of a quasi-static equilibrium process, and its thermoacoustic conversion efficiency is relatively high.

[0004] Although the annular pipeline is crucial for the operation of the thermoacoustic heat pump device, not all annular pipeline designs can achieve high efficiency. Although the thermoacoustic heat pump device can generate amplified acoustic power, its efficiency still has room for improvement. Therefore, the design and optimization of the annular pipeline are one of the key factors for improving the efficiency of the thermoacoustic heat pump device. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a loop structure in a thermoacoustic heat pump device, enabling sound waves to propagate in the loop, and the loop can resonate with the sound waves, improving the sound wave transmission efficiency and thus enhancing the thermoacoustic conversion efficiency.

[0006] To solve the above technical problems, the present utility model provides a loop structure in a thermoacoustic heat pump device, comprising a first loop pipe (1), a first short section (2), a second loop pipe (3) and a second short section (4);

[0007] Both the first loop pipe (1) and the second loop pipe (3) are arc-shaped pipes;

[0008] The first short section (2) and the second short section (4) are straight pipes;

[0009] One end of the first loop pipe (1) is connected to the core cabin (5), and the other end is connected to one end of the first short section (2);

[0010] The other end of the first short section (2) is connected to one end of the second loop pipe (3); the other end of the second loop pipe (3) is connected to one end of the second short section (4); the other end of the second short section (4) is connected to the cavity (6).

[0011] Further, in the loop structure of the thermoacoustic heat pump device, the diameter size range of the first loop pipe (1) and the second loop pipe (3) is 40 - 60 mm.

[0012] Further, in the loop structure of the thermoacoustic heat pump device, the length range of the first short section (2) is 100 - 150 mm.

[0013] Further, in the loop structure of the thermoacoustic heat pump device, the length range of the second short section (4) is 50 - 80 mm.

[0014] Further, in the loop structure of the thermoacoustic heat pump device, the sum of the lengths of the first loop pipe (1), the second loop pipe (3), the first short section (2) and the second short section (4) ranges from 1000 - 4000 mm.

[0015] Further, in the loop structure of the thermoacoustic heat pump device, the arc radius of the first loop pipe (1) is greater than the arc radius of the second loop pipe (3).

[0016] Further, in the loop structure of the thermoacoustic heat pump device, the arc radius range of the first loop pipe (1) is 500 - 2000 mm; the arc radius range of the second loop pipe (3) is 400 - 450 mm.

[0017] Further, in the loop structure of the thermoacoustic heat pump device, the materials of the first loop pipe (1), the first short section (2), the second loop pipe (3) and the second short section (4) are all stainless steel materials.

[0018] Further, in the loop structure of the thermoacoustic heat pump device, the connection mode between the first loop pipe (1), the first short section (2), the second loop pipe (3) and the second short section (4) is welding.

[0019] Further, in the loop structure of the thermoacoustic heat pump device, the wall thickness range of the first loop pipe (1), the first short section (2), the second loop pipe (3) and the second short section (4) is 5 - 50 mm.

[0020] Compared with the prior art, the present utility model has at least the following beneficial effects:

[0021] The first loop pipe and the second loop pipe are arc-shaped pipes, and the first loop pipe and the second loop pipe are connected by the first short section of a straight pipe. At the same time, the second loop pipe and the cavity are also connected by the second short section of a straight pipe. This connection mode enhances the transmission efficiency of thermoacoustic waves. When the sound wave propagates in the loop, the loop can resonate with the sound wave, improving the sound wave transmission efficiency and thus enhancing the thermoacoustic conversion performance of the thermoacoustic heat pump device.

[0022] The arc-shaped design of the first loop pipe and the second loop pipe is beneficial to the transmission of thermoacoustic waves and the resonance of the loop pipes, while the design of the first short section and the second short section plays a role in connecting and stabilizing the loop pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of the loop structure in the thermoacoustic heat pump device in an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The loop structure in the thermoacoustic heat pump device of the present utility model will be described in more detail below with reference to the schematic diagrams, in which the preferred embodiments of the present utility model are shown. It should be understood that those skilled in the art can modify the present utility model described herein while still achieving the beneficial effects of the present utility model. Therefore, the following description should be understood as a broad guidance for those skilled in the art and not as a limitation to the present utility model.

[0025] In the following paragraphs, the present utility model will be described more specifically by way of example with reference to the drawings. The advantages and features of the present utility model will be clearer according to the following description. It should be noted that the drawings are all in a very simplified form and use non-precise scales, only for the purpose of facilitating and clearly assisting in explaining the purpose of the embodiments of the present utility model.

[0026] As Figure 1 shown, this embodiment proposes a loop structure in a thermoacoustic heat pump device, including a first loop pipe 1, a first short section 2, a second loop pipe 3 and a second short section 4.

[0027] Specifically, one end of the first annular pipe 1 is connected to the core module 5, and the other end is connected to one end of the first short section 2. The other end of the first short section 2 is connected to one end of the second annular pipe 3. The other end of the second annular pipe 3 is connected to one end of the second short section 4. The other end of the second short section 4 is connected to the cavity 6, forming a complete loop.

[0028] In this embodiment, the first annular pipe 1, the first short section 2, the second annular pipe 3, and the second short section 4 are all made of stainless steel and are connected by welding. Using stainless steel has the advantages of long service life and improved efficiency of thermoacoustic wave transmission.

[0029] Since the first annular pipe 1, the first short section 2, the second annular pipe 3, and the second short section 4 are connected end to end and together with the core module 5 and the cavity 6 form a closed space, the air molecules inside can vibrate freely, and the pipe wall can transmit and amplify this vibration. During the process of acoustic wave conduction in the annular pipe, the resonance effect plays an important role. Resonance refers to the phenomenon that an object can vibrate maximally when it is externally vibrated at a specific frequency. In the entire loop structure, when the frequency of the acoustic wave is equal to the natural frequency of the loop, it will cause the resonance vibration of the air molecules in the pipe, forming a standing wave. A standing wave is formed by two opposite acoustic waves propagating back and forth in the loop. They form nodes and antinodes at specific positions. A node is the area with the least vibration, and an antinode is the area with the most vibration. This resonance effect makes the acoustic wave amplified when propagating in the loop, and acoustic waves of specific frequencies are more likely to propagate.

[0030] In this embodiment, both the first annular pipe 1 and the second annular pipe 3 are arc-shaped pipes, which is convenient for forming a total loop structure connected end to end. In addition, the first short section 2 and the second short section 4 are straight pipes. The straight pipes are beneficial to forming the resonance effect, so that the acoustic wave is amplified when propagating in the loop, achieving the effect of improving the efficiency of thermoacoustic wave transmission.

[0031] In a specific example, the diameter range of the first annular pipe 1 and the second annular pipe 3 is 40 - 60 mm. Preferably, it can be 50 mm or 55 mm. The arc radius range of the first annular pipe 1 is 500 - 2000 mm, such as 600 mm, 1000 mm, or 1800 mm; the arc radius range of the second annular pipe 3 is 400 - 450 mm. Preferably, it can be 420 mm or 440 mm. The arc radius of the first annular pipe 1 is greater than that of the second annular pipe 3 because the cavity 6 is higher than the core module 5. This arc radius design is convenient for connection and forming the entire loop structure.

[0032] The length range of the first short section 2 is 100 - 150 mm. Preferably, it can be 120 mm, 130 mm or 140 mm. The length range of the second short section 4 is 50 - 80 mm. Preferably, it can be 60 mm or 70 mm.

[0033] The total length range of the first annular pipe 1, the second annular pipe 3, the first short section 2 and the second short section 4 is 2100 - 2400 mm. The loop structure within this length range can adapt to specific frequencies of thermoacoustic waves and enhance the transmission effect of thermoacoustic waves.

[0034] Through tests by those skilled in the art, it is found that when the dimensions and other data of the first annular pipe 1, the second annular pipe 3, the first short section 2 and the second short section 4 are within the above ranges, the transmission effect of sound waves in the loop is the best.

[0035] Since the natural frequency of the annular pipe depends on its length and shape, for a given frequency, the length of the loop can be adjusted to adapt to the specific frequency. The material and shape of the pipe wall also affect the transmission effect of sound waves. Factors such as the elasticity and density of the pipe wall material will affect the transmission speed and quality of sound waves. The change in shape will also affect the resonance effect and natural frequency, and the above length range and the arc-shaped pipe are conducive to the resonance of sound waves and the loop structure, increasing the sound wave propagation efficiency and enhancing the thermoacoustic conversion effect.

[0036] The wall thickness of the first annular pipe 1, the first short section (2), the second annular pipe (3) and the second short section (4) is 5 - 50 mm, for example, it can be 10 mm, 20 mm, 30 mm or 40 mm. If the pipe wall is too thick, it will lead to an increase in sound wave energy loss and affect the sound wave transmission efficiency; if the pipe wall is too thin, it may cause sound wave leakage, reducing the sound wave intensity and also affecting the sound wave transmission efficiency.

[0037] In summary, sound waves propagate in the loop through the vibration of molecules, and the pipe wall can transmit and amplify this vibration. The resonance effect causes the sound to be amplified when propagating in the loop, and specific frequency sounds are more likely to propagate. The natural frequency of the loop depends on factors such as the length and shape of the loop, as well as the material and shape of the pipe wall.

[0038] Install the above loop design in a thermoacoustic heat pump device. When the thermoacoustic heat pump device operates, sound waves will enter the loop. The loop pipe and the short section form a closed cavity, and the air molecules inside can vibrate freely, while the pipe wall can transmit and amplify this vibration. During the process of sound wave conduction in the loop pipe, the resonance effect plays an important role. When the sound wave contacts the pipe wall, it will cause the pipe wall to vibrate. When the frequency of the sound wave is equal to the natural frequency of the loop, it will cause the resonance vibration of the air molecules in the pipe, forming a standing wave. A standing wave is formed by two opposite sound waves propagating back and forth in the loop. They form nodes and antinodes at specific positions. The node is the area with the least vibration, while the antinode is the area with the most vibration. This resonance effect enables the sound wave to be amplified when propagating in the loop, achieving the effect of improving the transmission efficiency of thermoacoustic waves. For a given frequency, the length of the loop can be changed to adapt to a specific frequency.

[0039] Therefore, the above design improves the transmission efficiency of thermoacoustic waves in the cycle, thereby realizing efficient thermoacoustic conversion and improving the working efficiency of the traveling-wave thermoacoustic engine. Moreover, the traveling-wave thermoacoustic engine device in the annular pipeline can achieve self-sustained oscillation, further improving the working efficiency of the traveling-wave thermoacoustic engine.

[0040] When the thermoacoustic heat pump device is operating, the first loop pipe 1, the first short section 2, the second loop pipe 3, and the second short section 4 connect all the thermoacoustic engine units, forming a closed loop through this part. Such a design allows thermoacoustic waves to continuously propagate in the cycle, thereby realizing efficient thermoacoustic conversion. In addition, the traveling-wave thermoacoustic engine in the annular pipeline can achieve self-sustained oscillation, effectively improving the working efficiency of the thermoacoustic heat pump device.

[0041] Obviously, those skilled in the art can make various changes and modifications to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and its equivalent technologies, the present utility model also intends to include these changes and modifications.

Claims

1. A loop structure in a thermoacoustic heat pump device, characterized in that: It comprises a first annular tube (1), a first short section (2), a second annular tube (3) and a second short section (4); The first annular tube (1) and the second annular tube (3) are both arc-shaped pipes; The first short section (2) and the second short section (4) are straight pipes; One end of the first annular tube (1) is connected to the core module (5), and the other end is connected to one end of the first short section (2); The other end of the first short section (2) is connected to one end of the second ring tube (3); the other end of the second ring tube (3) is connected to one end of the second short section (4); and the other end of the second short section (4) is connected to the cavity (6).

2. The loop structure in the thermoacoustic heat pump device according to claim 1, characterized in that: The diameters of the first annular tube (1) and the second annular tube (3) are both in the range of 40-60 mm.

3. The loop structure in the thermoacoustic heat pump device according to claim 1, characterized in that: The length of the first short section (2) is in the range of 100-150 mm.

4. The loop structure in the thermoacoustic heat pump device according to claim 1, characterized in that: The length of the second short section (4) is in the range of 50-80 mm.

5. The loop structure in the thermoacoustic heat pump device according to claim 1, characterized in that: The sum of the lengths of the first ring tube (1), the second ring tube (3), the first short section (2) and the second short section (4) is in the range of 1000-4000 mm.

6. The loop structure in the thermoacoustic heat pump device according to claim 1, characterized in that: The arc radius of the first ring tube (1) is greater than the arc radius of the second ring tube (3).

7. The loop structure in the thermoacoustic heat pump device according to claim 1 or 6, characterized in that: The arc radius of the first ring tube (1) is in the range of 500-2000 mm; the arc radius of the second ring tube (3) is in the range of 400-450 mm.

8. The loop structure in the thermoacoustic heat pump device according to claim 1, characterized in that: The first annular tube (1), the first short section (2), the second annular tube (3) and the second short section (4) are all made of stainless steel.

9. The loop structure in the thermoacoustic heat pump device according to claim 1, characterized in that: The first annular tube (1), the first short section (2), the second annular tube (3) and the second short section (4) are connected by welding.

10. The loop structure in the thermoacoustic heat pump device according to claim 1, characterized in that: The wall thickness of the first annular tube (1), the first short section (2), the second annular tube (3) and the second short section (4) ranges from 5 to 50 mm.

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