Loop multistage heat driven heat pump

Abstract

The present application relates to the technical field of thermoacoustic heat engine, and provides a loop multi-stage heat-driven heat pump, which comprises at least three groups of thermoacoustic conversion modules, each group of the thermoacoustic conversion modules is connected in a head-to-tail mode through a second resonant pipe to form a loop with a wavelength length, each group of the thermoacoustic conversion modules comprises a thermoacoustic engine unit and a thermoacoustic heat pump unit, wherein in the same thermoacoustic conversion module, the thermoacoustic engine unit is connected to the outlet end of the thermoacoustic heat pump unit. The present application changes the conventional design idea, the thermoacoustic engine unit is connected to the outlet end of the thermoacoustic heat pump unit in the same thermoacoustic conversion module, high-efficiency coupling between the thermoacoustic engine unit and the thermoacoustic heat pump unit can be realized, meanwhile, the sound power loss in the thermoacoustic heat pump unit is reduced, so that the system efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thermoacoustic heat engine, in particular to a loop multi-stage heat driven heat pump. BACKGROUND

[0002] Thermoacoustic engine is a sound generator that converts heat energy into sound energy to realize sound power output; thermoacoustic heat pump is a device that converts mechanical energy in the form of sound wave into heat energy to realize heat pumping or refrigeration. The loop multi-stage heat driven heat pump can obtain refrigeration by using heat energy or improve low-grade heat energy.

[0003] The loop multi-stage heat driven heat pump structure in the prior art mainly consists of four units, each unit including a thermoacoustic engine, a thermoacoustic heat pump and a resonant tube.

[0004] Since the thermoacoustic engine is a component that generates sound power and the thermoacoustic heat pump is a component that consumes sound power, the conventional thinking is to connect the thermoacoustic heat pump behind the thermoacoustic engine in the same unit so that the sound power generated by the thermoacoustic engine enters the thermoacoustic heat pump and is consumed.

[0005] However, the arrangement in the prior art has the following defects:

[0006] 1) The temperature difference between the high-temperature heat exchanger of the thermoacoustic engine and the medium-temperature heat exchanger of the thermoacoustic heat pump is large, so the length of the thermal buffer tube connected between the high-temperature heat exchanger and the medium-temperature heat exchanger needs to be lengthened. The lengthened thermal buffer tube is not conducive to the thermoacoustic engine and the thermoacoustic heat pump to obtain ideal sound field conditions.

[0007] 2) There is a sudden cross section at the junction of the resonant tube and the thermal buffer tube of the thermoacoustic heat pump, and a large amount of sound power will be converted into heat energy and absorbed by the low-temperature heat exchanger of the thermoacoustic heat pump. When the loop multi-stage heat driven heat pump is used as a refrigerator, it is easy to cause loss of cold energy.

[0008] 3) If a load is connected to the resonant tube of the existing loop multi-stage heat driven heat pump, the sound power generated by the thermoacoustic engine will flow through the thermoacoustic heat pump before entering the load, thereby causing large energy loss and low system efficiency. SUMMARY

[0009] The present application provides a loop multi-stage heat driven heat pump to solve at least one of the above technical defects in the prior art, realize efficient coupling between the thermoacoustic engine unit and the thermoacoustic heat pump unit, improve system efficiency, and reduce sound power loss in the thermoacoustic heat pump unit.

[0010] In order to achieve the above purpose, the present application provides a loop multi-stage heat driven heat pump, comprising:

[0011] At least three groups of thermoacoustic conversion modules, each group of thermoacoustic conversion modules of the at least three groups of thermoacoustic conversion modules is connected head to tail through a second resonant pipe to form a wavelength length loop;

[0012] Each group of thermoacoustic conversion modules comprises a thermoacoustic engine unit and a thermoacoustic heat pump unit.

[0013] In the same thermoacoustic conversion module, the thermoacoustic engine unit is connected to the outlet end of the thermoacoustic heat pump unit.

[0014] According to the loop multi-stage heat-driven heat pump provided by the application, the thermoacoustic engine unit comprises a first heat buffer pipe, a high-temperature heat exchanger, a first regenerator and a first medium-temperature heat exchanger connected in sequence.

[0015] The thermoacoustic heat pump unit comprises a second heat buffer pipe, a low-temperature heat exchanger, a second regenerator and a second medium-temperature heat exchanger connected in sequence.

[0016] The second heat buffer pipe is connected to the first medium-temperature heat exchanger, and the first heat buffer pipe is connected to the second resonant pipe.

[0017] According to the loop multi-stage heat-driven heat pump provided by the application, the thermoacoustic heat pump unit comprises a second heat buffer pipe, a low-temperature heat exchanger, a second regenerator and a second medium-temperature heat exchanger connected in sequence.

[0018] The elastic diaphragm assembly is connected to the first medium-temperature heat exchanger.

[0019] According to the loop multi-stage heat-driven heat pump provided by the application, a load is arranged on the second resonant pipe.

[0020] According to the loop multi-stage heat-driven heat pump provided by the application, the thermoacoustic conversion modules in the loop multi-stage heat-driven heat pump comprise three groups, four groups, five groups or six groups.

[0021] According to the loop multi-stage heat-driven heat pump provided by the application, the working medium used by the loop multi-stage heat-driven heat pump is helium, hydrogen, nitrogen or a combination thereof.

[0022] In order to achieve the above-mentioned purpose, the loop multi-stage heat-driven heat pump provided by the application comprises:

[0023] At least three groups of thermoacoustic conversion modules, each group of thermoacoustic conversion modules of the at least three groups of thermoacoustic conversion modules is connected head to tail through a second resonant pipe to form a wavelength length loop;

[0024] Each group of thermoacoustic conversion modules comprises a high-temperature heat exchanger, a first regenerator, a low-temperature heat exchanger, a second regenerator and a second medium-temperature heat exchanger connected in sequence.

[0025] The second resonant pipe is provided with a load.

[0026] The thermoacoustic conversion module in the loop multi-stage thermal drive heat pump comprises three groups, four groups, five groups or six groups.

[0027] The working medium used in the loop multi-stage thermal drive heat pump is helium, hydrogen, nitrogen or a combination thereof.

[0028] The loop multi-stage thermal drive heat pump changes the conventional design idea, and the thermoacoustic engine unit is connected to the outlet end of the thermoacoustic heat pump unit in the same thermoacoustic conversion module, so that efficient coupling between the thermoacoustic engine unit and the thermoacoustic heat pump unit can be realized, the system efficiency is improved, and the acoustic power loss in the thermoacoustic heat pump unit is reduced.

[0029] Specifically, the acoustic power generated by the thermoacoustic engine unit in the application is only consumed by the second resonant pipe in a small amount of acoustic power, compared with the loop multi-stage thermal drive heat pump in the prior art, and the structure can effectively reduce the acoustic power loss in the transmission process.

[0030] Secondly, the two ends of the second heat buffer pipe are connected with the first medium-temperature heat exchanger and the low-temperature heat exchanger respectively, the first medium-temperature heat exchanger serves as the cold end of the thermoacoustic engine, the temperature is basically the ambient temperature, the temperature of the low-temperature heat exchanger is relatively close to that of the first medium-temperature heat exchanger, so the temperature difference between the two ends of the second heat buffer pipe is small, it is not necessary to set a second heat buffer pipe with a too long length to exchange heat, and the second heat buffer pipe with a short length can reduce the influence of its dead volume on the system, and it is more conducive to obtaining ideal sound field conditions to improve the efficiency of the system.

[0031] Furthermore, one end of the first heat buffer pipe is connected to the high-temperature heat exchanger, and the other end is connected to the second resonant pipe, although the intersection of the second resonant pipe and the first heat buffer pipe will generate a certain acoustic power loss due to the sudden change of the cross section, so that the acoustic power is dissipated into heat, but because the first heat buffer pipe is arranged close to the high-temperature heat exchanger, the dissipated acoustic power will not produce additional negative effects, but will reduce the heating amount required by the system to improve the system performance.

[0032] Finally, if the loop multi-stage thermal drive heat pump provided in the application is connected with a load, the acoustic power generated by the thermoacoustic engine unit can be preferably introduced into the load, and the remaining acoustic power is introduced into the thermoacoustic heat pump unit through the second resonant pipe, compared with the prior art, the design can effectively reduce the loss generated by the acoustic power flowing through the thermoacoustic heat pump unit, and further improve the flexibility of cold and electric regulation. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0034] Figure 1 is a structural schematic diagram of the prior art;

[0035] Figure 2 is one of the structural schematic diagrams of the loop multi-stage heat-driven heat pump provided by the present application;

[0036] Figure 3 is another of the structural schematic diagrams of the loop multi-stage heat-driven heat pump provided by the present application;

[0037] Figure 4 is a third of the structural schematic diagrams of the loop multi-stage heat-driven heat pump provided by the present application;

[0038] Figure 5 is a fourth of the structural schematic diagrams of the loop multi-stage heat-driven heat pump provided by the present application;

[0039] Figure 6 is a fifth of the structural schematic diagrams of the loop multi-stage heat-driven heat pump provided by the present application;

[0040] Figure 7 is a sixth of the structural schematic diagrams of the loop multi-stage heat-driven heat pump provided by the present application.

[0041] Reference signs:

[0042] 101, engine medium-temperature heat exchanger; 102, engine regenerator; 103, engine high-temperature heat exchanger; 104, engine thermal buffer pipe; 105, first resonant pipe; 106, heat pump medium-temperature heat exchanger; 107, heat pump regenerator; 108, heat pump low-temperature heat exchanger; 109, heat pump thermal buffer pipe;

[0043] 1, thermoacoustic engine unit; 11, first thermal buffer pipe; 12, high-temperature heat exchanger; 13, first regenerator; 14, first medium-temperature heat exchanger;

[0044] 2, thermoacoustic heat pump unit; 21, second thermal buffer pipe; 22, low-temperature heat exchanger; 23, second regenerator; 24, second medium-temperature heat exchanger; 25, elastic diaphragm assembly;

[0045] 3, second resonant pipe; 4, load. DETAILED DESCRIPTION

[0046] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in conjunction with the drawings in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0047] In the description of the application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. "First", "second", "third", "fourth" do not represent any sequence relationship, but only distinguish for convenience of description. For those of ordinary skill in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0048] As Figure 1 shown, is a commonly used heat-driven thermoacoustic heat pump structure, which is mainly composed of four thermoacoustic conversion modules connected in sequence through a first resonant pipe 105, each thermoacoustic conversion module including a thermoacoustic engine, a thermoacoustic heat pump and a first resonant pipe 105.

[0049] The thermoacoustic engine is mainly composed of an engine intermediate temperature heat exchanger 101, an engine regenerator 102, an engine high temperature heat exchanger 103 and an engine thermal buffer pipe 104 connected in sequence.

[0050] The thermoacoustic heat pump is mainly composed of a heat pump intermediate temperature heat exchanger 106, a heat pump regenerator 107, a heat pump low temperature heat exchanger 108 and a heat pump thermal buffer pipe 109 connected in sequence.

[0051] Among them, the engine high temperature heat exchanger 103 is usually connected with a heat source (the heat source can be combustion waste heat, industrial waste heat, solar heat collector, etc.), and the temperature of the heat source is usually as high as several hundred degrees Celsius, and the engine high temperature heat exchanger 103 absorbs the heat of the heat source to form a high temperature end; the engine intermediate temperature heat exchanger 101 is usually connected with a cold source (the cold source can be air cooling or water cooling), and the temperature of the cold source is close to the ambient temperature, and the engine intermediate temperature heat exchanger 101 absorbs the cold of the cold source to form a low temperature end.

[0052] When the engine high-temperature heat exchanger 103 is raised to a certain temperature, a certain temperature gradient is formed at the two ends of the engine regenerator 102, and self-excited acoustic wave oscillation is generated in the thermoacoustic engine, the acoustic wave enters the thermoacoustic heat pump through the engine heat buffer tube 104, and part of the acoustic wave energy is consumed in the thermoacoustic heat pump to pump heat from the heat pump low-temperature heat exchanger 108 to the heat pump medium-temperature heat exchanger 106; the remaining part of the acoustic wave energy enters the first resonant tube 105 and is transmitted to the thermoacoustic engine of the next thermoacoustic conversion module through the first resonant tube 105, and the system is operated in a cycle without moving parts, and has high reliability.

[0053] The embodiments of the present application will be described below in conjunction with Figures 2 to 7 It should be understood that the following description is only illustrative of the present application and does not constitute any limitation on the present application.

[0054] The loop multi-stage heat-driven heat pump provided by the present application comprises at least three groups of thermoacoustic conversion modules, each group of thermoacoustic conversion modules is connected in series through a second resonant tube 3 to form a loop with a wavelength length, each group of thermoacoustic conversion modules comprises a thermoacoustic engine unit 1 and a thermoacoustic heat pump unit 2, and in the same thermoacoustic conversion module, the thermoacoustic engine unit 1 is connected to the outlet end of the thermoacoustic heat pump unit 2.

[0055] According to the above description, it can be understood that since the thermoacoustic engine is a component for generating acoustic power and the thermoacoustic heat pump is a component for consuming acoustic power, the conventional design idea is to connect the thermoacoustic heat pump to the outlet end of the thermoacoustic engine in the same thermoacoustic conversion module, so that the high-temperature heat exchanger of the thermoacoustic engine is adjacent to the medium-temperature heat exchanger of the thermoacoustic heat pump, and the temperature difference between the two is large, for this reason, it is necessary to lengthen the length of the heat buffer tube connected between the two, and the increase in the length of the heat buffer tube is not conducive to the thermoacoustic engine and the thermoacoustic heat pump to obtain ideal acoustic field conditions; in addition, there is a sudden cross section at the junction of the resonant tube and the heat buffer tube of the thermoacoustic heat pump, when the loop multi-stage heat-driven heat pump is used as a refrigerator, it is easy to cause loss of cold energy; furthermore, if the existing loop multi-stage heat-driven heat pump is connected to a load, the acoustic power generated by the thermoacoustic engine will flow through the thermoacoustic heat pump before entering the load, causing large energy loss and low system operation efficiency.

[0056] Therefore, the present application provides a reverse design idea which is opposite to the existing loop multi-stage heat-driven heat pump, that is, connecting the thermoacoustic engine unit 1 to the outlet end of the thermoacoustic heat pump unit 2 in the same thermoacoustic conversion module, through which setting, efficient coupling between the thermoacoustic engine unit 1 and the thermoacoustic heat pump unit 2 can be achieved, the system efficiency is improved, and the acoustic power loss in the thermoacoustic heat pump unit 2 is reduced.

[0057] Please refer to Figure 2As an embodiment of the present application, the embodiment provides a loop multi-stage thermal driving heat pump.

[0058] The thermoacoustic engine unit 1 comprises a first thermal buffer tube 11, a high-temperature heat exchanger 12, a first regenerator 13 and a first medium-temperature heat exchanger 14 connected in sequence.

[0059] The thermoacoustic heat pump unit 2 comprises a second thermal buffer tube 21, a low-temperature heat exchanger 22, a second regenerator 23 and a second medium-temperature heat exchanger 24 connected in sequence; the second thermal buffer tube 21 is connected with the first medium-temperature heat exchanger 14; and the first thermal buffer tube 11 is connected with the second resonant tube 3.

[0060] In the embodiment, the thermoacoustic engine unit 1 is connected at the outlet end of the thermoacoustic heat pump unit 2 in the same thermoacoustic conversion module, that is, the second thermal buffer tube 21 in the thermoacoustic heat pump unit 2 is connected with the first medium-temperature heat exchanger 14 in the thermoacoustic engine unit, and the first thermal buffer tube 11 in the thermoacoustic engine unit is connected with the second resonant tube 3.

[0061] When the high-temperature heat exchanger 12 is connected with a heat source to obtain high temperature, the first medium-temperature heat exchanger 14 is connected with a cold source to obtain low temperature, and a temperature gradient is formed at both ends of the first regenerator 13, the thermoacoustic engine unit 1 converts thermal energy into acoustic power in the first regenerator 13, and the acoustic power is transmitted along the positive direction of the temperature gradient; therefore, the acoustic power generated by the thermoacoustic engine unit 1 first passes through the first thermal buffer tube 11, then enters the second resonant tube 3, and is transmitted to the thermoacoustic heat pump unit 2 in the next thermoacoustic conversion module through the second resonant tube 3.

[0062] Firstly, in the transmission process, the acoustic power generated by the thermoacoustic engine unit 1 only passes through the second resonant tube 3 to consume a small amount of acoustic power, and experiments prove that, compared with the loop multi-stage thermal driving heat pump in the prior art, the structure can effectively reduce the acoustic power loss in the transmission process.

[0063] In addition, the diameter of the second resonant tube 3 can also be adaptively adjusted according to the system power, so that the second resonant tube 3 has a small loss in the transmission process of the acoustic power.

[0064] Secondly, in the transmission process, the second thermal buffer tube 21 is connected with the first medium-temperature heat exchanger 14 and the low-temperature heat exchanger 22 at both ends, respectively; the first medium-temperature heat exchanger 14 serves as the cold end of the thermoacoustic engine, and the temperature thereof tends to be the ambient temperature; the temperature of the low-temperature heat exchanger 22 is close to that of the first medium-temperature heat exchanger 14; therefore, the temperature difference between both ends of the second thermal buffer tube 21 is small, and it is not necessary to set a second thermal buffer tube 21 with a long length to block heat exchange; and the second thermal buffer tube 21 with a short length can reduce the influence of its dead volume on the system, and is more conducive to obtaining ideal sound field conditions to improve the efficiency of the system.

[0065] Further, in the heat transfer process, one end of the first thermal buffer tube 11 is connected to the high-temperature heat exchanger 12, and the other end is connected to the second resonant tube 3. Although the junction of the second resonant tube 3 and the first thermal buffer tube 11 will cause a certain acoustic power loss due to the sudden change in cross-section, which will dissipate the acoustic power as heat, because the first thermal buffer tube 11 is arranged adjacent to the high-temperature heat exchanger 12, the dissipated acoustic power will not have additional negative effects, but will also reduce the heating amount required by the system to improve the performance of the system.

[0066] As shown in Figure 3 , as an embodiment of the present application, on the basis of the above embodiment, different from the above embodiment, the thermoacoustic heat pump unit 2 comprises an elastic diaphragm assembly 25, a low-temperature heat exchanger 22, a second regenerator 23 and a second medium-temperature heat exchanger 24 connected in sequence; wherein the elastic diaphragm assembly 25 is connected to the first medium-temperature heat exchanger 14.

[0067] It can be understood that in this embodiment, the elastic diaphragm assembly 25 is used instead of the second thermal buffer tube 21 in the above embodiment to block the heat transfer, i.e. to block the mixing of gases at different temperatures in the low-temperature heat exchanger 22 and the first medium-temperature heat exchanger 14; the elastic diaphragm assembly 25 can further reduce the dead volume in the system, which is more conducive to obtaining suitable acoustic field conditions.

[0068] In addition, in the structural design of this embodiment, the first thermal buffer tube 11 in the thermoacoustic engine unit 1 can be shortened, and at the same time, the second resonant tube 3 can play the role of part of the first thermal buffer tube 11, which can further reduce the negative effects of the dead volume of the first thermal buffer tube 11 in the thermoacoustic engine unit 1 on the system.

[0069] As shown in Figure 4 , as an embodiment of the present application, on the basis of the above embodiment, different from each of the above embodiments, the loop multi-stage heat-driven heat pump comprises at least three sets of thermoacoustic conversion modules, and each set of thermoacoustic conversion modules of the at least three sets of thermoacoustic conversion modules are connected in sequence through the second resonant tube 3 to form a loop with a wavelength length; each set of thermoacoustic conversion modules comprises a high-temperature heat exchanger 12, a first regenerator 13, a low-temperature heat exchanger 22, a second regenerator 23 and a second medium-temperature heat exchanger 24 connected in sequence.

[0070] It can be understood that in this embodiment, when the thermoacoustic heat pump unit 2 mainly utilizes heat, the first medium-temperature heat exchanger 14 of the thermoacoustic engine unit 1 mainly utilizes the ambient temperature as a cold source for cooling; and the low-temperature heat exchanger 22 in the thermoacoustic heat pump unit 2 just absorbs heat from the ambient temperature, so the first medium-temperature heat exchanger 14 and the low-temperature heat exchanger 22 can be combined into one heat exchanger component to reduce the volume of the heat exchanger and the heat exchange amount between the heat exchanger and the environment.

[0071] The structure design can not only simplify the system, but also avoid using the first thermal buffer tube 11 in the thermoacoustic engine unit 1 under the given structure, and make the second resonant tube 3 play the role of the first thermal buffer tube 11, so as to reduce the negative influence of the engine buffer tube dead volume on the system and improve the system efficiency.

[0072] In each of the above embodiments, the second resonant tube 3 can be provided with a load 4, and the sound power generated by the thermoacoustic engine unit 1 can preferably enter the load 4, and the remaining sound power enters the thermoacoustic heat pump unit 2 through the second resonant tube 3. Compared with the prior art, the design can effectively reduce the loss of sound power flowing through the thermoacoustic heat pump unit 2, thereby improving the flexibility of cold and electric regulation.

[0073] For example, the load 4 can be a generator, and the sound power generated by the thermoacoustic engine unit 1 can preferably enter the generator to drive the piston in the generator to generate power, with small energy loss and large driving force. In the prior art, the second resonant tube 3 is connected to the generator, so that when the system realizes cold and electric or cold, heat and electric combined supply, the sound power generated by the thermoacoustic engine unit 1 will flow through the thermoacoustic engine unit 1 before entering the generator, thereby generating large energy loss, especially when the proportion of electric power output by the system increases, the overall efficiency decreases obviously.

[0074] As shown in Figure 3 , Figure 5 , Figure 6 , Figure 7 indicated, in each of the above embodiments, the thermoacoustic conversion module in the loop multi-stage heat-driven heat pump can include three groups, four groups, five groups or six groups.

[0075] When the thermoacoustic conversion module in the loop multi-stage heat-driven heat pump is four groups, the four groups of thermoacoustic conversion modules are sequentially connected in series through the second resonant tube 3, each thermoacoustic conversion module has the same structure and includes a thermoacoustic engine unit 1 and a thermoacoustic heat pump unit 2.

[0076] For example, the thermoacoustic engine unit 1 includes a first thermal buffer tube 11, a high-temperature heat exchanger 12, a first regenerator 13 and a first medium-temperature heat exchanger 14 connected in sequence; and the thermoacoustic heat pump unit 2 includes a second thermal buffer tube 21, a low-temperature heat exchanger 22, a second regenerator 23 and a second medium-temperature heat exchanger 24 connected in sequence.

[0077] In addition, the second thermal buffer tube 21 is connected with the first medium-temperature heat exchanger 14; and the first thermal buffer tube 11 is connected with the second resonant tube 3.

[0078] In the present embodiment, the high-temperature heat exchanger 12 in each thermoacoustic engine unit 1 is connected to a heat source, and absorbs heat from the heat source to form a high-temperature end; the first medium-temperature heat exchanger 14 in each thermoacoustic engine unit 1 is connected to a cold source, and absorbs cold from the cold source to form a low-temperature end, and a temperature gradient is formed in the first regenerator 13 in each thermoacoustic engine unit 1.

[0079] The first regenerator 13 in each thermoacoustic engine unit 1 converts thermal energy into acoustic power under the temperature gradient, and the acoustic power propagates in the positive direction of the temperature gradient for amplification: that is,

[0080] In the thermoacoustic engine unit A, the first regenerator 13 converts thermal energy into acoustic power, and the acoustic power propagates in the positive direction of the temperature gradient, that is, the acoustic power generated in the first regenerator 13 is first transmitted to the first thermal buffer tube 11, and then transmitted to the thermoacoustic heat pump unit 2 in the thermoacoustic engine unit B via the second resonant tube 3 to consume part of the acoustic power, and the remaining acoustic power flows to the first regenerator 13 in the thermoacoustic engine unit B, and the acoustic power is again amplified under the temperature gradient of the first regenerator 13 in the thermoacoustic engine unit B, and the acoustic power flowing out of the first regenerator 13 in the thermoacoustic engine unit B is transmitted to the thermoacoustic engine unit C via the high-temperature heat exchanger 12 and the first thermal buffer tube 11 of the thermoacoustic engine unit B and the second resonant tube 3, and the acoustic power is again amplified under the temperature gradient of the first regenerator 13 in the thermoacoustic engine unit C, and the acoustic power flowing out of the first regenerator 13 in the thermoacoustic engine unit C is transmitted to the thermoacoustic engine unit D via the high-temperature heat exchanger 12 and the first thermal buffer tube 11 of the thermoacoustic engine unit C and the second resonant tube 3, and the acoustic power is again amplified under the temperature gradient of the first regenerator 13 in the thermoacoustic engine unit D, and so on.

[0081] When the thermoacoustic conversion module in the loop multi-stage heat-driven heat pump is three groups, five groups or six groups, the transmission process is the same as that of the thermoacoustic conversion module described above, and thus will not be described in detail, for example, the circulation loop of the three-group thermoacoustic conversion module is transmitted along the thermoacoustic engine unit A, the thermoacoustic engine unit B and the thermoacoustic engine unit C in turn; for example, the circulation loop of the five-group thermoacoustic conversion module is transmitted along the thermoacoustic engine unit A, the thermoacoustic engine unit B, the thermoacoustic engine unit C, the thermoacoustic engine unit D and the thermoacoustic engine unit E in turn, and for example, the circulation loop of the six-group thermoacoustic conversion module is transmitted along the thermoacoustic engine unit A, the thermoacoustic engine unit B, the thermoacoustic engine unit C, the thermoacoustic engine unit D, the thermoacoustic engine unit E and the thermoacoustic engine unit F in turn.

[0082] When the loop multi-stage heat-driven heat pump is used as a refrigeration device, the temperature of the low-temperature heat exchanger is usually a refrigeration temperature or an air conditioning temperature.

[0083] The low-temperature heat exchanger of the loop multi-stage thermal driving heat pump provided by the application is usually at the outdoor temperature in winter when the loop multi-stage thermal driving heat pump is used as a heat pump. In the thermoacoustic engine unit 1, the high-temperature heat exchanger 12 is connected to a heat source, and when the temperature of the high-temperature heat exchanger 12 rises to a certain value, a certain temperature gradient is formed between the two ends of the first regenerator 13, and self-excited acoustic wave oscillation is generated in the thermoacoustic engine unit 1. The acoustic wave enters the thermoacoustic heat pump unit 2 through the first thermal buffer tube 11, part of the energy of the acoustic wave is consumed in the thermoacoustic heat pump unit 2, and heat is pumped from the low-temperature heat exchanger 22 to the second medium-temperature heat exchanger 24, and the remaining energy enters the second resonant tube 3 and is transmitted to the thermoacoustic engine unit 1 of the next thermoacoustic conversion module.

[0084] The heat source can include various forms of heat supply sources, such as solar energy, industrial waste heat, combustion heat, etc. The working medium used in refrigeration can be helium, hydrogen, nitrogen or a combination thereof.

[0085] The working frequency of the loop multi-stage thermal driving heat pump provided by the application is determined by the total length of the system. When the load 4 is externally connected to the second resonant tube 3, part of the acoustic power can be used to drive the load 4 and converted into other forms of energy. The structure of the loop can make the traveling wave component in the acoustic field larger, provide a more ideal working condition for the regenerator, and make the thermoacoustic conversion efficiency higher.

[0086] It should be noted that theoretically, any identical engine can be connected in series to form a loop, and the phase of the acoustic field at the regenerator and the power of the system need to be considered.

[0087] The application point of the application is that in the same thermoacoustic conversion module, the outlet end of the thermoacoustic heat pump unit 2 connected to the thermoacoustic engine unit 1, that is, the second thermal buffer tube 21 of the thermoacoustic heat pump unit 2 is connected to the first medium-temperature heat exchanger 14 of the thermoacoustic engine unit 1.

[0088] Firstly, in the transmission process, the acoustic power generated by the thermoacoustic engine unit 1 only consumes a small amount of acoustic power through the second resonant tube 3. Experiments show that, compared with the loop multi-stage thermal driving heat pump in the prior art, the structure can effectively reduce the acoustic power loss in the transmission process.

[0089] Secondly, in the transmission process, the two ends of the second thermal buffer tube 21 are connected to the first medium-temperature heat exchanger 14 and the low-temperature heat exchanger 22 respectively. The first medium-temperature heat exchanger 14 serves as the cold end of the thermoacoustic engine, and the temperature is basically the ambient temperature. The temperature difference between the low-temperature heat exchanger 22 and the first medium-temperature heat exchanger 14 is small, so the temperature difference between the two ends of the second thermal buffer tube 21 is small. Therefore, it is not necessary to set a second thermal buffer tube 21 with a too long length to exchange heat, and the second thermal buffer tube 21 with a short length can reduce the influence of its dead volume on the system, which is more conducive to obtaining ideal acoustic field conditions and improving the efficiency of the system.

[0090] Further, in the transmission process, one end of the first thermal buffer tube 11 is connected to the high-temperature heat exchanger 12, and the other end is connected to the second resonant tube 3. Although the intersection of the second resonant tube 3 and the first thermal buffer tube 11 will cause a certain acoustic power loss due to the sudden change in cross-section, the dissipated acoustic power will not have additional negative effects because the first thermal buffer tube 11 is arranged adjacent to the high-temperature heat exchanger 12. On the contrary, it will reduce the heating amount required by the system to improve the performance of the system.

[0091] Finally, if the loop multi-stage thermal drive heat pump provided by the present application is connected to the load 4, the acoustic power generated by the thermo-acoustic engine unit 1 can be preferably introduced into the load 4, and the remaining acoustic power is introduced into the thermo-acoustic heat pump unit 2 through the second resonant tube 3. Compared with the prior art, this design can effectively reduce the loss of acoustic power flowing through the thermo-acoustic heat pump unit 2, thereby improving the flexibility of cold and electric regulation.

[0092] It should be noted that the technical solutions in each embodiment of the present application can be combined with each other, but the basis for the combination is that it can be realized by a person skilled in the art; when the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, that is, it is not within the protection scope of the present application.

[0093] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A multi-stage heat-driven heat pump with a loop, characterized in that, include: At least three sets of thermoacoustic conversion modules, each of the at least three sets of thermoacoustic conversion modules being connected end to end through a second resonant tube to form a loop of one wavelength. Each thermoacoustic conversion module includes a thermoacoustic engine unit and a thermoacoustic heat pump unit. In the same thermoacoustic conversion module, the thermoacoustic engine unit is connected to the outlet end of the thermoacoustic heat pump unit; The thermoacoustic engine unit includes a first thermal buffer tube, a high-temperature heat exchanger, a first regenerator, and a first medium-temperature heat exchanger connected in sequence. The thermoacoustic heat pump unit includes a second heat buffer tube, a low-temperature heat exchanger, a second regenerator, and a second medium-temperature heat exchanger connected in sequence. The second heat buffer tube is connected to the first medium-temperature heat exchanger; the first heat buffer tube is connected to the second resonant tube; and a load is provided on the second resonant tube. The thermoacoustic conversion modules in the loop multi-stage heat-driven heat pump include three, four, five, or six groups.

2. The loop multi-stage heat-driven heat pump according to claim 1, characterized in that, The working fluid used in the loop multi-stage heat-driven heat pump is helium, hydrogen, nitrogen, or a combination thereof.

3. A multi-stage heat-driven heat pump with a loop, characterized in that, include: At least three sets of thermoacoustic conversion modules, each of the at least three sets of thermoacoustic conversion modules being connected end to end through a second resonant tube to form a loop of one wavelength. Each thermoacoustic conversion module includes a thermoacoustic engine unit and a thermoacoustic heat pump unit. In the same thermoacoustic conversion module, the thermoacoustic engine unit is connected to the outlet end of the thermoacoustic heat pump unit; The thermoacoustic engine unit includes a first thermal buffer tube, a high-temperature heat exchanger, a first regenerator, and a first medium-temperature heat exchanger connected in sequence. The thermoacoustic heat pump unit includes an elastic diaphragm assembly, a low-temperature heat exchanger, a second regenerator, and a second medium-temperature heat exchanger connected in sequence; wherein, the elastic diaphragm assembly is connected to the first medium-temperature heat exchanger. A load is provided on the second resonant tube; the thermoacoustic conversion module in the loop multi-stage heat-driven heat pump includes three, four, five or six groups.

4. The loop multi-stage heat-driven heat pump according to claim 3, characterized in that, The working fluid used in the loop multi-stage heat-driven heat pump is helium, hydrogen, nitrogen, or a combination thereof.

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