Air source heat pump structure with thermoacoustic device, heating method and defrosting method

Abstract

The air source heat pump structure comprises an evaporator, a preheating thermoacoustic device, a first electronic valve, a compressor, a condenser, an expansion valve and a second electronic valve, the output end of the evaporator is connected with a refrigerant inlet of the preheating thermoacoustic device, and a refrigerant outlet of the preheating thermoacoustic device is connected with the input end of the first electronic valve; two output ends of the first electronic valve are connected with the compressor and the input end of the second electronic valve respectively, the output end of the compressor is connected with the input end of the condenser, the output end of the condenser is connected with the expansion valve and connected with the other input end of the second electronic valve through the expansion valve, and the output end of the second electronic valve is connected with the input end of the evaporator. The preheating thermoacoustic device is adopted to preheat the refrigerant, so that the energy required by the compressor for compressing the refrigerant to increase the temperature is reduced, and the heating performance and the energy efficiency ratio are improved; in the low-temperature environment, the preheating thermo-acoustic device can be adopted to melt frost, the heating efficiency is guaranteed and improved, and the problem that the heating effect is poor due to frosting of the evaporator is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of air source heat pumps, and particularly to an air source heat pump structure with a thermoacoustic device, a heating method, and a defrosting method. Background Art

[0002] An air source heat pump is an energy-saving and environmentally friendly device that provides hot water by utilizing the heat energy in the air. Its working principle is as follows: First, the evaporator absorbs the low-temperature heat in the air, causing the refrigerant liquid in the evaporator to evaporate into a low-temperature and low-pressure gas. Then, these low-temperature and low-pressure gases are compressed by the compressor and transformed into high-temperature and high-pressure gases, which then enter the condenser. During this process, heat is released to heat the water, and at the same time, the gases are transformed back into liquids. Finally, the liquid returns to the evaporator after being depressurized by the throttle valve, completing the cycle.

[0003] However, in winter, the temperature is relatively low, the COP of the air source heat pump system is low, and when dew forms on the surface of the evaporator during the heat absorption process, frosting will occur on the surface of the evaporator, resulting in the ineffective contact between the surface of the evaporator and the air, further reducing the COP of the entire system, and thus causing the outlet water temperature to fail to reach the target.

[0004] Therefore, there is an urgent need for an air source heat pump structure with a thermoacoustic device, a heating method, and a defrosting method to solve the problem of poor heating effect of conventional air source heat pump systems in low-temperature environments. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides an air source heat pump structure with a thermoacoustic device, a heating method, and a defrosting method to solve the problem of poor heating effect of conventional air source heat pump systems in low-temperature environments.

[0006] To achieve the above object, the present invention adopts the following technical solutions: An air source heat pump structure with a thermoacoustic device, characterized in that it includes an evaporator, a preheating thermoacoustic device, a first electronic valve, a compressor, a condenser, an expansion valve, and a second electronic valve. The output end of the evaporator is connected to the refrigerant inlet of the preheating thermoacoustic device, the refrigerant outlet of the preheating thermoacoustic device is connected to the input end of the first electronic valve, the two output ends of the first electronic valve are respectively connected to the compressor and the input end of the second electronic valve, the output end of the compressor is connected to the input end of the condenser, the output end of the condenser is connected to the expansion valve and is connected to the other input end of the second electronic valve through the expansion valve, and the output end of the second electronic valve is connected to the input end of the evaporator.

[0007] To optimize the above technical solution, the specific measures taken further include: Furthermore, the preheating thermoacoustic device includes a main body housing, a circulating air intake device, a resonance device, and a speaker. A speaker is provided at the upper end of the inner cavity of the main body housing. A resonance device is provided below the speaker in the inner cavity of the main body housing. The lower part of the resonance device is of a sealed structure. The speaker is used to vibrate towards the resonance device. A circulating air intake device is provided below the resonance device in the inner cavity of the main body housing. The circulating air intake device is used to introduce external air to transfer heat to the lower end of the resonance device and discharge it. A heat exchange pipe is provided between the resonance device and the speaker. The two ends of the heat exchange pipe are respectively a refrigerant inlet and a refrigerant outlet. The two ends of the heat exchange pipe are hermetically connected to the main body housing. The space below the speaker is communicated with the resonance device and filled with helium gas.

[0008] Furthermore, the resonance device includes a stack structure and a vertical conical divergent resonator. The stack structure is a columnar structure with several rows of vertical through holes provided therein, and the lower end is communicated with a hollow vertical conical divergent resonator. The upper end of the stack structure is attached to the side wall of the heat exchange pipe. Helium gas is filled in the heat exchange pipe, the vertical through holes of the stack structure, and the hollow vertical conical divergent resonator.

[0009] Furthermore, the stack structure includes a heat exchange structure, a stacking structure, and an environmental heat exchange structure. The upper end of the heat exchange structure is used to attach to the side wall of the heat exchange pipe. The lower end of the heat exchange structure is connected to the environmental heat exchange structure through the stacking structure. The lower end of the environmental heat exchange structure is connected to the vertical conical divergent resonator.

[0010] Furthermore, both the heat exchange structure and the environmental heat exchange structure are made of copper, and the stacking structure is made of polyester film.

[0011] Furthermore, the vertical conical divergent resonator includes a conical structure and a hemispherical structure. The necked end of the conical structure is arranged upward, and is hermetically and communicatively connected to the lower end of the stack structure. The flared end of the conical structure is connected to the flared end of the hemispherical structure.

[0012] Furthermore, the circulating air intake device includes an intake grille, an outlet grille, an intake fan, and a motor mounting bracket. An intake grille communicating the inner cavity and the outside is provided on the bottom side wall of the main body housing. An intake fan is mounted through the motor mounting bracket at the position of the intake grille in the inner cavity of the main body housing. An outlet grille communicating the inner cavity and the outside is provided on the side wall of the main body housing above the intake fan.

[0013] Furthermore, in the inner cavity of the main body housing, a back volume air spring system is provided above the speaker, and helium gas is filled in the back volume air spring system.

[0014] Furthermore, a heating method for an air source heat pump structure with the thermoacoustic device includes the following steps: The refrigerant in the gas-liquid mixed state absorbs low-temperature heat from the air through the evaporator and becomes a completely gaseous refrigerant. Then, it enters the preheating thermoacoustic device from the refrigerant inlet through the connecting pipe, absorbs heat in the preheating thermoacoustic device, and becomes a gaseous refrigerant with medium temperature and medium pressure. Then, from the refrigerant outlet, it passes through the first electronic valve from the preheating thermoacoustic device and is connected to the compressor by the first electronic valve. After being compressed by the compressor, the gaseous refrigerant with medium temperature and medium pressure is compressed into a gaseous refrigerant with high temperature and high pressure. Subsequently, the refrigerant enters the condenser through the connecting pipe, exchanges heat with the water to be heated entering the condenser, and becomes a high-temperature and high-pressure liquid refrigerant. Then, the refrigerant passes through the expansion valve and becomes a gaseous and liquid mixed refrigerant with low temperature and low pressure. Subsequently, it passes through the connecting pipe, passes through the second electronic valve, and enters the evaporator to form a heating cycle.

[0015] Further, a defrosting method for an air source heat pump structure with a thermoacoustic device includes the following steps: After the blades of the evaporator are frosted, the refrigerant in the low-temperature and low-pressure gas-liquid coexistence state enters the preheating thermoacoustic device from the refrigerant inlet through the connecting pipe, absorbs heat in the preheating thermoacoustic device, and becomes a gaseous refrigerant with medium temperature and medium pressure. Then, from the refrigerant outlet, it passes through the first electronic valve from the preheating thermoacoustic device and is directly connected to the second electronic valve through the connecting pipe. At this time, the gaseous refrigerant with medium temperature and medium pressure directly enters the evaporator for heat exchange. Subsequently, the refrigerant flows out of the evaporator, enters the preheating thermoacoustic device again through the refrigerant inlet through the connecting pipe, and forms a defrosting cycle.

[0016] The beneficial effects of the present invention are as follows: Through the cooperative setting of the evaporator, preheating thermoacoustic device, first electronic valve, compressor, condenser, expansion valve, and second electronic valve, the present invention preheats the refrigerant by using the preheating thermoacoustic device, greatly reduces the energy required for the compressor to compress the refrigerant and increase the temperature, saves electric energy, and greatly improves the heating performance and energy efficiency ratio of the air source heat pump; in a low-temperature environment, the preheating thermoacoustic device can be used to melt the ice and frost. Through the cooperative use of the first electronic valve and the second electronic valve, a circuit is formed between the preheating thermoacoustic device and the evaporator. The medium-pressure and medium-temperature gas output by the preheating thermoacoustic device enters the evaporator and can be used to melt the ice and frost covering the blades of the evaporator, so as to ensure and improve the overall heating efficiency of the device; the solution of the present invention solves the problem of poor heating effect caused by frosting on the surface of the evaporator in a low-temperature environment and improves the heating performance of the device.

[0017] The present invention utilizes the moving coil of a loudspeaker to vibrate the diaphragm, driving the helium gas in the cavity below it through a continuous compression and expansion process. Since the continuous compression and expansion of helium gas will result in a fixed high-temperature and low-temperature region in the resonance device, the low-temperature region in the resonance device can be used in conjunction with a circulating air intake device to absorb the heat energy in the air. The absorbed heat energy is transmitted to the high-temperature region through the resonance device and is combined with a heat exchange pipeline for the heat exchange pipeline to absorb the heat energy to heat the refrigerant, achieving a preheating effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. is a schematic diagram of the overall structure of an air source heat pump structure with a thermoacoustic device proposed by the present invention; Figure 2 FIG. is a schematic diagram of the structure of a preheating thermoacoustic device of an air source heat pump structure with a thermoacoustic device proposed by the present invention; Figure 3 FIG. is a schematic diagram of the internal structure of a preheating thermoacoustic device of an air source heat pump structure with a thermoacoustic device proposed by the present invention; Figure 4 FIG. is a sectional view of the structure of a stack structure of an air source heat pump structure with a thermoacoustic device proposed by the present invention; Figure 5 FIG. is a schematic diagram of the usage process of an air source heat pump structure with a thermoacoustic device proposed by the present invention.

[0019] Reference numerals: 1. Evaporator, 2-1. First electronic valve, 2-2. Second electronic valve, 3. Expansion valve, 4. Compressor, 5. Preheating thermoacoustic device, 5-1. Air intake grille, 5-2. Main body housing, 5-3. Air outlet grille, 5-4-1. Refrigerant inlet, 5-4-2. Refrigerant outlet, 5-5. Air intake fan, 5-6. Motor mounting bracket, 5-7. Vertical conical divergent resonator, 5-8. Stack structure, 5-9. Loudspeaker, 5-10. Back volume air spring system, 5-8-1. Heat exchange structure, 5-8-2. Stacked structure, 5-8-3. Ambient heat exchange structure, 6. Condenser. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Now, the present invention will be further described in detail with reference to the accompanying drawings.

[0021] As shown in the appended Figure 1As shown in the figure, a structure of an air source heat pump with a thermoacoustic device according to an embodiment of the present invention includes an evaporator 1, a preheating thermoacoustic device 5, a first electronic valve 2-1, a compressor 4, a condenser 6, an expansion valve 3, and a second electronic valve 2-2. The output end of the evaporator 1 is connected to the refrigerant inlet 5-4-1 of the preheating thermoacoustic device 5. The refrigerant outlet 5-4-2 of the preheating thermoacoustic device 5 is connected to the input end of the first electronic valve 2-1. The two output ends of the first electronic valve 2-1 are respectively connected to the input end of the compressor 4 and the input end of the second electronic valve 2-2. The output end of the compressor 4 is connected to the input end of the condenser 6. The output end of the condenser 6 is connected to the expansion valve 3 and is connected to the other input end of the second electronic valve 2-2 through the expansion valve 3. The output end of the second electronic valve 2-2 is connected to the input end of the evaporator 1.

[0022] Through the cooperative setting of the evaporator 1, the preheating thermoacoustic device 5, the first electronic valve 2-1, the compressor 4, the condenser 6, the expansion valve 3, and the second electronic valve 2-2, the present invention preheats the refrigerant by using the preheating thermoacoustic device 5, greatly reducing the energy required for the compressor 4 to compress the refrigerant and increase the temperature, saving electric energy, and greatly improving the heating performance and energy efficiency ratio of the air source heat pump; in a low-temperature environment, the preheating thermoacoustic device 5 can be used to melt ice and frost. Through the cooperative use of the first electronic valve 2-1 and the second electronic valve 2-2, a loop is formed between the preheating thermoacoustic device 5 and the evaporator 1. The medium-pressure and medium-temperature gas output by the preheating thermoacoustic device 5 enters the evaporator 1 and can be used to melt the ice and frost covering the blades of the evaporator 1, so as to ensure and improve the overall heating efficiency of the device; the solution of the present invention solves the problem of poor heating effect caused by frosting on the surface of the evaporator 1 in a low-temperature environment and improves the heating performance of the device.

[0023] As shown in the attached Figure 2 and attached Figure 3 As shown in the figure, in a specific embodiment based on the above, the preheating thermoacoustic device 5 includes a main body housing 5-2, a circulating air intake device, a resonance device, and a speaker 5-9. A speaker 5-9 is provided at the upper end of the inner cavity of the main body housing 5-2. A resonance device is provided below the speaker 5-9 in the inner cavity of the main body housing 5-2. The lower part of the resonance device is a closed structure. The speaker 5-9 is used to vibrate towards the resonance device. A circulating air intake device is provided below the resonance device in the inner cavity of the main body housing 5-2. The circulating air intake device is used to introduce external air to transfer heat to the lower end of the resonance device and discharge it. A heat exchange pipe is provided between the resonance device and the speaker 5-9. The two ends of the heat exchange pipe are respectively a refrigerant inlet 5-4-1 and a refrigerant outlet 5-4-2. The two ends of the heat exchange pipe are hermetically connected to the main body housing 5-2. The space below the speaker 5-9 is communicated with the resonance device and filled with helium.

[0024] Thus, by using the moving coil of the speaker 5-9 to vibrate the diaphragm, the helium gas in the cavity below it is driven through a continuous compression and expansion process. Due to the continuous compression and expansion of the helium gas, a fixed high-temperature and low-temperature region will appear in the resonance device. Then, the low-temperature region in the resonance device can be used in conjunction with the circulating air intake device to absorb the heat energy in the air. The absorbed heat energy is transmitted to the high-temperature region through the resonance device and is used in conjunction with the heat exchange pipeline for the heat exchange pipeline to absorb the heat energy to heat the refrigerant, achieving the preheating effect. In this solution, the preheating thermoacoustic device 5 uses the thermoacoustic principle to utilize the heat energy in the external low-temperature environment to increase the temperature of the gaseous refrigerant.

[0025] Among them, in a further specific embodiment based on the above, the resonance device can be a divergent vertical resonator, which includes a stack structure 5-8 and a vertical conical divergent resonator 5-7. The stack structure 5-8 is a columnar structure with several rows of parallel vertical through holes, and the lower end is connected to the hollow vertical conical divergent resonator 5-7. The upper end of the stack structure 5-8 is attached to the side wall of the heat exchange pipeline. Helium gas is filled in the heat exchange pipeline, the vertical through holes of the stack structure 5-8, and the hollow vertical conical divergent resonator 5-7. In this solution, the working principle of the resonance device depends on the resonance effect of sound waves. Resonance occurs when the frequency of the sound wave matches the natural frequency of the resonance device, and the system can effectively amplify the vibration. Therefore, the length of this resonance device can be approximately one-fourth of the wavelength of the sound wave emitted by the speaker 5-9. Among them, the stack structure 5-8 can be a solid, rigid porous structure that supports a high-temperature gradient.

[0026] As shown in the appendix Figure 4 In the figure, among them, in a further specific embodiment based on the above, the stack structure 5-8 includes a heat exchange structure 5-8-1, a stacking structure 5-8-2, and an environmental heat exchange structure 5-8-3. The upper end of the heat exchange structure 5-8-1 is used to attach to the side wall of the heat exchange pipeline. The lower end of the heat exchange structure 5-8-1 is connected to the environmental heat exchange structure 5-8-3 through the stacking structure 5-8-2. The lower end of the environmental heat exchange structure 5-8-3 is connected to the vertical conical divergent resonator 5-7. Among them, heat is transferred from the environmental heat exchange structure 5-8-3 to the heat exchange structure 5-8-1 through the oscillating helium gas passing through the vertical through holes of the stack structure 5-8. In this solution, the cross-sections and diameters of the heat exchange structure 5-8-1, the stacking structure 5-8-2, and the environmental heat exchange structure 5-8-3 are the same, only the lengths are different. For the heat exchange structure 5-8-1, the stacking structure 5-8-2, and the environmental heat exchange structure 5-8-3, the thicknesses of the parallel plates between their vertical through holes are the same, and the plate spacings are also the same.

[0027] In this solution, the resonant device is kept vertically placed. The advantage of keeping the resonant device vertical is that the stacked structure 5-8-2 is located above the environmental heat exchange structure 5-8-3, and the heat exchange structure 5-8-1 is located above the stacked structure 5-8-2. This avoids natural convection heat transfer, that is, by avoiding the generation of density differences in the surrounding gas, heat can be transferred from the environmental heat exchange structure 5-8-3 to the heat exchange structure 5-8-1 in the reverse direction.

[0028] Among them, in a further specific embodiment based on the above, both the heat exchange structure 5-8-1 and the environmental heat exchange structure 5-8-3 are made of copper, and the stacked structure 5-8-2 is made of polyester film.

[0029] Among them, in a further specific embodiment based on the above, the vertical conical divergent resonator 5-7 includes a conical structure and a hemispherical structure. The constricted end of the conical structure is arranged upward, and can be hermetically and communicatively connected to the lower end of the stack structure 5-8 through a connecting cavity. The flared end of the conical structure is connected to the flared end of the hemispherical structure. In this solution, the main body of the vertical conical divergent resonator 5-7 is mainly divided into two parts, the conical divergent cross-sectional structure, that is, the conical structure, and the hemispherical end, that is, the hemispherical structure. The role of the conical divergent cross-sectional structure is to gradually expand the airflow in the resonant device, which helps to enhance the amplification effect of sound waves, while reducing the fluid resistance and optimizing the flow characteristics of the gas. The hemispherical structure design at the end can effectively increase the sound wave amplification effect of the resonant device. When the sound wave propagates to the end of the resonator, the hemispherical shape helps the reflection and interference of the sound wave, thereby enhancing the amplitude of the sound wave.

[0030] Among them, in a further specific embodiment based on the above, the circulating air intake device includes an air intake grille 5-1, an air outlet grille 5-3, an air intake fan 5-5 and a motor mounting bracket 5-6. The bottom side wall of the main body housing 5-2 is provided with an air intake grille 5-1 communicating the inner cavity and the outside. In the inner cavity of the main body housing 5-2 at the position of the air intake grille 5-1, an air intake fan 5-5 is installed through the motor mounting bracket 5-6. The side wall of the main body housing 5-2 above the air intake fan 5-5 is provided with an air outlet grille 5-3 communicating the inner cavity and the outside. In this embodiment, the air outlet grille 5-3 can be arranged at the constricted opening of the conical structure of the above-mentioned vertical conical divergent resonator 5-7.

[0031] During use, air enters the preheating thermoacoustic device 5 through the air intake grille 5-1 at the lower part of the preheating thermoacoustic device 5, is blown upward by the air intake fan 5-5, and finally the air is discharged from the preheating thermoacoustic device 5 through the air outlet grille 5-3 in the middle of the preheating thermoacoustic device 5.

[0032] Among them, in a further specific embodiment based on the above, in the inner cavity of the main body housing 5-2, a back volume air spring system 5-10 is provided above the loudspeaker 5-9, and the back volume air spring system 5-10 is filled with helium. In this solution, the back volume air spring system 5-10 is filled with helium at about 10 bar, which can be used to reduce noise problems and improve its electro-acoustic efficiency. The setting of the back volume air spring system 5-10 can facilitate the matching of the operating frequency of the loudspeaker 5-9 with the designed resonance frequency of the helium in the resonance device. In this embodiment, sound-absorbing materials can be installed on the inner wall of the back volume air spring system 5-10, and these sound-absorbing materials can serve as a complete sound insulation cover for the loudspeaker 5-9 to minimize noise problems.

[0033] As shown in the Figure 5 accompanying drawings, a heating method of the device of the present invention includes the following steps: The refrigerant in a gas-liquid mixed state absorbs low-temperature heat from the air through the evaporator 1 and becomes a completely gaseous refrigerant, and then enters the preheating thermoacoustic device 5 through the connection pipe from the refrigerant inlet 5-4-1, and absorbs heat in the heat exchange structure 5-8-1 in the preheating thermoacoustic device 5 to become a medium-temperature and medium-pressure gaseous refrigerant. Then, it exits from the refrigerant outlet 5-4-2, passes through the first electronic valve 2-1 after leaving the preheating thermoacoustic device 5, and is connected to the compressor 4 by the first electronic valve 2-1. After being compressed by the compressor 4, the medium-temperature and medium-pressure gaseous refrigerant is compressed into a high-temperature and high-pressure gaseous refrigerant. Subsequently, the refrigerant enters the condenser 6 through the connection pipe, exchanges heat with the water to be heated entering the condenser 6, and becomes a high-temperature and high-pressure liquid refrigerant. Then, the refrigerant passes through the expansion valve 3 and becomes a low-temperature and low-pressure gaseous and liquid mixed refrigerant, and then enters the evaporator 1 through the connection pipe after passing through the second electronic valve 2-2 to form a heating cycle.

[0034] A defrosting method of the device of the present invention includes the following steps: After the blades of the evaporator 1 are frosted, the refrigerant in the evaporator 1 cannot absorb enough heat from the evaporator 1. The low-temperature and low-pressure refrigerant in a gas-liquid coexistence state enters the preheating thermoacoustic device 5 through the connection pipe from the refrigerant inlet 5-4-1, and absorbs heat in the heat exchange structure 5-8-1 in the preheating thermoacoustic device 5 to become a medium-temperature and medium-pressure gaseous refrigerant. Then, it exits from the refrigerant outlet 5-4-2, passes through the first electronic valve 2-1 after leaving the preheating thermoacoustic device 5, and is directly connected to the second electronic valve 2-2 through the connection pipe. At this time, the medium-temperature and medium-pressure gaseous refrigerant directly enters the evaporator 1 for heat exchange. In the evaporator 1, the medium-temperature and medium-pressure gaseous refrigerant inside is used to melt the ice and frost on the blades of the evaporator 1. Subsequently, the refrigerant flows out of the evaporator 1 and enters the preheating thermoacoustic device 5 again through the connection pipe through the refrigerant inlet 5-4-1 to form a defrosting cycle.

[0035] In this solution, since there is no expansion valve 3 in this cycle, the refrigerant entering the evaporator 1 has a relatively high temperature. Therefore, it can be circulated multiple times to finally completely melt the frost on the evaporator 1, ultimately improving the heating efficiency of the air source heat pump.

[0036] It should be noted that the terms such as "upper", "lower", "left", "right", "front", and "rear" cited in the invention are only for the convenience of clear narration and are not used to limit the scope of implementation of the present invention. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope of implementation of the present invention.

[0037] The above is only the preferred implementation mode of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

Claims

1. An air source heat pump structure with a thermoacoustic device, characterized in that: The invention comprises an evaporator (1), a preheating thermoacoustic device (5), a first electronic valve (2-1), a compressor (4), a condenser (6), an expansion valve (3) and a second electronic valve (2-2), wherein the output end of the evaporator (1) is connected to the refrigerant inlet (5-4-1) of the preheating thermoacoustic device (5), the refrigerant outlet (5-4-2) of the preheating thermoacoustic device (5) is connected to the input end of the first electronic valve (2-1), the two output ends of the first electronic valve (2-1) are respectively connected to the input ends of the compressor (4) and the second electronic valve (2-2), the output end of the compressor (4) is connected to the input end of the condenser (6), the output end of the condenser (6) is connected to the expansion valve (3) and connected to the other input end of the second electronic valve (2-2) through the expansion valve (3), and the output end of the second electronic valve (2-2) is connected to the input end of the evaporator (1).

2. The air source heat pump structure with a thermoacoustic device according to claim 1, characterized in that: The preheating thermoacoustic device (5) comprises a main body shell (5-2), a circulating air intake device, a resonance device and a speaker (5-9); the speaker (5-9) is provided at the upper end of the inner cavity of the main body shell (5-2); a resonance device is provided in the inner cavity of the main body shell (5-2) below the speaker (5-9); the lower part of the resonance device is a closed structure; the speaker (5-9) is used to vibrate toward the resonance device; a circulating air intake device is provided in the inner cavity of the main body shell (5-2) below the resonance device; the circulating air intake device is used to introduce external air to the lower end of the resonance device for heat transfer and discharge; a heat exchange pipe is provided between the resonance device and the speaker (5-9); the two ends of the heat exchange pipe are respectively the refrigerant inlet (5-4-1) and the refrigerant outlet (5-4-2); the two ends of the heat exchange pipe are sealedly connected to the main body shell (5-2); the space below the speaker (5-9) is connected to the resonance device and is filled with helium.

3. The air source heat pump structure with a thermoacoustic device according to claim 2, characterized in that: The resonance device comprises a stack structure (5-8) and a vertical conical diverging resonator (5-7); the stack structure (5-8) is a columnar structure with several rows of vertical through holes, and the lower end is connected to the hollow vertical conical diverging resonator (5-7); the upper end of the stack structure (5-8) is in contact with the side wall of the heat exchange pipe; the heat exchange pipe, the vertical through holes of the stack structure (5-8) and the hollow vertical conical diverging resonator (5-7) are filled with helium.

4. The air source heat pump structure with a thermoacoustic device according to claim 3, characterized in that: The stack structure (5-8) comprises a heat exchange structure (5-8-1), a stack structure (5-8-2) and an environmental heat exchange structure (5-8-3); the upper end of the heat exchange structure (5-8-1) is used to fit the side wall of the heat exchange pipe; the lower end of the heat exchange structure (5-8-1) is connected to the environmental heat exchange structure (5-8-3) via the stack structure (5-8-2); and the lower end of the environmental heat exchange structure (5-8-3) is connected to the vertical conical divergent resonator (5-7).

5. The air source heat pump structure with a thermoacoustic device according to claim 4, characterized in that: The heat exchange structure (5-8-1) and the environment heat exchange structure (5-8-3) are both made of copper, and the stacking structure (5-8-2) is made of polyester film.

6. The air source heat pump structure with a thermoacoustic device according to claim 3, characterized in that: The vertical conical divergent resonator (5-7) comprises a conical structure and a hemispherical structure, the conical structure having a narrowed end arranged upward and sealed and connected to the lower end of the stack structure (5-8), and the conical structure having a widened end connected to the widened end of the hemispherical structure.

7. The air source heat pump structure with a thermoacoustic device according to claim 2, characterized in that: The circulating air intake device comprises an air intake grille (5-1), an air outlet grille (5-3), an air intake fan (5-5) and a motor mounting frame (5-6); the bottom side wall of the main body shell (5-2) is provided with an air intake grille (5-1) communicating with the inner cavity and the outside; the inner cavity of the main body shell (5-2) is located at the air intake grille (5-1), and the air intake fan (5-5) is installed via the motor mounting frame (5-6); the side wall of the main body shell (5-2) located above the air intake fan (5-5) is provided with an air outlet grille (5-3) communicating with the inner cavity and the outside.

8. The air source heat pump structure with a thermoacoustic device according to claim 2, characterized in that: In the inner cavity of the main body shell (5-2), a back volume gas spring system (5-10) is provided at the upper end of the speaker (5-9), and the back volume gas spring system (5-10) is filled with helium.

9. A heating method of an air source heat pump structure with a thermoacoustic device as claimed in any one of claims 1 to 8, comprising the following steps: The refrigerant in a gas-liquid mixed state absorbs low-temperature heat from the air through the evaporator (1) to become a completely gaseous refrigerant, then enters the preheating thermoacoustic device (5) from the refrigerant inlet (5-4-1) through the connecting pipe, absorbs heat in the preheating thermoacoustic device (5) to become a medium-temperature and medium-pressure gaseous refrigerant, then passes through the first electronic valve (2-1) from the preheating thermoacoustic device (5) through the refrigerant outlet (5-4-2), and is connected to the compressor (4) by the first electronic valve (2-1). After being compressed by the compressor (4), the medium-temperature and medium-pressure gaseous refrigerant is compressed into a high-temperature and high-pressure gaseous refrigerant. Then, the refrigerant enters the condenser (6) through the connecting pipe, exchanges heat with the water to be heated in the condenser (6), and becomes a high-temperature and high-pressure liquid refrigerant. Then, the refrigerant passes through the expansion valve (3) to become a low-temperature and low-pressure gaseous and liquid mixed refrigerant, and then enters the evaporator (1) through the connecting pipe and the second electronic valve (2-2), forming a heating cycle.

10. A defrosting method for an air source heat pump structure with a thermoacoustic device as claimed in any one of claims 1 to 8, comprising the following steps: After the blades of the evaporator (1) are frosted, the low-temperature and low-pressure refrigerant in a gas-liquid coexistence state enters the preheating thermoacoustic device (5) from the refrigerant inlet (5-4-1) through the connecting pipe, absorbs heat in the preheating thermoacoustic device (5) and becomes a medium-temperature and medium-pressure gaseous refrigerant, and then passes through the first electronic valve (2-1) from the preheating thermoacoustic device (5) through the refrigerant outlet (5-4-2), and is directly connected to the second electronic valve (2-2) through the connecting pipe. At this time, the medium-temperature and medium-pressure gaseous refrigerant directly enters the evaporator (1) for heat exchange, and then the refrigerant flows out of the evaporator (1) through the connecting pipe and enters the preheating thermoacoustic device (5) again through the refrigerant inlet (5-4-1) to form a defrosting cycle.

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