Heat pump system

Abstract

The present application relates to the technical field of heat pump, and discloses a heat pump system, which comprises multiple groups of double-acting free piston type thermoacoustic Stirling heat pump units, multiple magnetic screws, a magnetic rotor assembly and a rotary driving mechanism. The heat pump units are sequentially connected through gas path conduits to form a closed working medium circulation loop. The heat pump unit is provided with a piston connecting rod. The magnetic screw is connected with the piston connecting rod in one-to-one correspondence. The magnetic rotor assembly is contactlessly coupled with each magnetic screw. The rotary driving mechanism is drivingly connected with the magnetic rotor assembly. The rotary power output by the rotary driving mechanism can be contactlessly converted into the reciprocating linear motion of the magnetic screw through magnetic coupling, so as to drive the piston connecting rod to drive the heat pump to circulate and operate, thereby replacing the traditional linear motor or crank connecting rod structure. Thus, mechanical friction loss can be eliminated, the transmission efficiency and system reliability can be improved, the equipment cost and integrated control difficulty can be reduced, the heat pump has high power density and wide working condition adaptation capability, and can meet the application requirements of high-power industrial high-temperature heat pumps.

Description

Technical Field

[0001] This invention relates to the field of heat pump technology, and more particularly to a heat pump system. Background Technology

[0002] Carbon reduction and energy conservation have become key development directions in the industrial sector. High-temperature heat pumps, as efficient heat energy enhancement equipment that can convert low-grade heat energy into high-grade heat energy, have irreplaceable application value in industrial heating, waste heat recovery, and other scenarios. Among them, Stirling cycle-based heat pump technology, with its advantages of achieving large temperature difference heat exchange in a single stage, high heat pump efficiency, and compact structure, has become the core technology development direction for high-temperature operating conditions.

[0003] Dual-acting Stirling heat pumps are the mainstream structure adapted to high-power industrial scenarios. They typically use multiple dual-acting free-piston thermoacoustic Stirling heat pump units connected in series to form a closed-loop working fluid cycle. The core of this system is to convert the mechanical energy of the drive source into the reciprocating linear motion of the pistons of each dual-acting free-piston thermoacoustic Stirling heat pump unit through a power transmission system, thereby completing the compression and expansion process of the working fluid and improving the quality of thermal energy.

[0004] Currently, there are two main technical routes for the power transmission of double-acting Stirling heat pumps: one is the swashplate / crank-connecting rod mechanical transmission route, which can achieve the reciprocating motion of multiple pistons through a rotary motor. However, the mechanical transmission structure has inherent frictional losses, which not only reduces the system's energy efficiency but also leads to severe wear of parts, shortens the equipment's service life, and increases maintenance costs. At the same time, the backlash and inertial forces in the mechanical transmission can easily cause poor synchronization of piston movement, affecting the stability of the heat pump cycle. The second is the linear compressor drive route. Although the reciprocating motion of the piston is directly driven by a linear motor, eliminating mechanical transmission friction, multiple high-precision dedicated linear compressors need to be configured one-to-one for multiple double-acting free piston thermoacoustic Stirling heat pump units. The piston movement and the working fluid circulation pressure are strongly coupled, requiring a complex multi-axis resonant synchronous control system, which leads to high system integration difficulty, high equipment cost, and poor adaptability to operating conditions. Moreover, the power density of linear compressors is generally low, and the upper limit of the power of a single unit is limited, making it difficult to meet the needs of high-power industrial applications ranging from hundreds of kilowatts to several megawatts. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a heat pump system.

[0006] This invention provides a heat pump system, comprising: multiple sets of double-acting free-piston type thermoacoustic Stirling heat pump units, wherein each of the double-acting free-piston type thermoacoustic Stirling heat pump units is connected to form a closed working fluid circulation loop through a gas duct, each double-acting free-piston type thermoacoustic Stirling heat pump unit includes a piston connecting rod; multiple magnetic screws, each magnetic screw being connected to the piston connecting rod in a one-to-one correspondence; a magnetic rotor assembly, wherein the magnetic rotor assembly is magnetically coupled to each of the magnetic screws without contact; and a rotary drive mechanism, wherein the rotary drive mechanism is connected to the magnetic rotor assembly.

[0007] The rotary drive mechanism is used to drive the magnetic rotor assembly to rotate, and to drive each of the magnetic screws to reciprocate linearly through magnetic coupling.

[0008] According to a heat pump system provided by the present invention, the double-acting free-piston type thermoacoustic Stirling heat pump unit further includes: a cylinder, wherein the piston connecting rod is slidably connected to the inner cavity of the cylinder to divide the inner cavity of the cylinder into a compression chamber and an expansion chamber; a high-temperature heat exchanger, wherein the high-temperature heat exchanger is connected to the compression chamber; a regenerator, wherein the regenerator is connected to the high-temperature heat exchanger; and a low-temperature heat exchanger, wherein the low-temperature heat exchanger is connected to the regenerator and is connected to the expansion chamber of an adjacent double-acting free-piston type thermoacoustic Stirling heat pump unit through the gas duct.

[0009] According to a heat pump system provided by the present invention, the heat pump system further includes: a housing, wherein the cylinder, the rotary drive mechanism, the magnetic rotor assembly and the magnetic screw are all covered by the housing.

[0010] According to a heat pump system provided by the present invention, the magnetic rotor assembly includes: a rotor body; a plurality of first N-pole magnets; and a plurality of first S-pole magnets. The first N-pole magnets and the first S-pole magnets are arranged alternately in a spiral arrangement on the inner ring sidewall of the rotor body.

[0011] The magnetic screw includes: an inner rod body; multiple second N-pole magnets; and multiple second S-pole magnets. The second N-pole magnets and the second S-pole magnets are arranged alternately in a spiral pattern on the outer wall of the inner rod body.

[0012] According to a heat pump system provided by the present invention, the number of magnetic rotor assemblies is one, the number of rotary drive mechanisms is one, and the rotary drive mechanism is connected to the rotor body.

[0013] Each of the magnetic screws is arranged circumferentially at intervals to the inner ring of the rotor body.

[0014] According to a heat pump system provided by the present invention, the magnetic screws are arranged in a staggered manner along their axial direction.

[0015] According to a heat pump system provided by the present invention, the number of magnetic rotor assemblies is multiple, and the number of rotary drive mechanisms is multiple.

[0016] Each of the rotary drive mechanisms is connected to each of the rotor bodies in a one-to-one correspondence, and each of the magnetic screws is arranged in a one-to-one correspondence to the inner ring of each of the rotor bodies.

[0017] According to a heat pump system provided by the present invention, when the rotary drive mechanism is rotating in the forward direction, the heat pump system is in a high-temperature heat pump heating mode, and the corresponding high-temperature heat exchanger is located at the upper end of the regenerator; when the rotary drive mechanism is rotating in the reverse direction, the heat pump system is in a cooling mode or a conventional heat pump mode, and the corresponding high-temperature heat exchanger is located at the lower end of the regenerator and connected to the compressor.

[0018] According to a heat pump system provided by the present invention, the heat pump system further includes: a first temperature sensor connected to the high-temperature heat exchanger; and a controller connected to the first temperature sensor and the rotary drive mechanism, for adjusting the working state of the rotary drive mechanism based on the detection result of the first temperature sensor in the high-temperature heat pump heating mode.

[0019] According to a heat pump system provided by the present invention, the heat pump system further includes: a second temperature sensor, the second temperature sensor being connected to the low-temperature heat exchanger.

[0020] The controller is used to adjust the operating state of the rotary drive mechanism based on the detection results of the second temperature sensor in the cooling mode or conventional heat pump mode.

[0021] The heat pump system provided by this invention includes multiple sets of double-acting free-piston thermoacoustic Stirling heat pump units. These units are sequentially connected via gas ducts to form a closed loop for the circulation of the working fluid. Each set of units is equipped with a piston rod for driving the compression and expansion of the working fluid. The system includes multiple magnetic screws fixedly connected to the piston rods, and magnetic rotor assemblies that form non-contact magnetic coupling with each screw. The magnetic rotor assemblies are connected to a rotary drive mechanism. The rotational power output by the rotary drive mechanism can be non-contactly converted into axial reciprocating linear motion of each screw through magnetic field coupling between the magnetic rotor assemblies and the screws, ultimately driving the corresponding piston rods to synchronously complete reciprocating linear motion, thus driving the heat pump to continuously circulate.

[0022] During operation, the rotary drive mechanism outputs rotational power, driving the connected magnetic rotor assembly to rotate synchronously. Through the non-contact magnetic coupling between the magnetic rotor assembly and each magnetic screw, the circular rotational motion is converted into the axial reciprocating linear motion of each magnetic screw. This, in turn, drives the piston connecting rod, which is connected to the magnetic screw one by one, to perform synchronous reciprocating linear motion within the double-acting free piston thermoacoustic Stirling heat pump unit. The movement of the piston connecting rod changes the chamber volume within the double-acting free piston thermoacoustic Stirling heat pump unit, thereby driving the compression and expansion of the circulating working fluid. In conjunction with the closed working fluid circulation loop formed by the connection of each double-acting free piston thermoacoustic Stirling heat pump unit through the gas duct, the orderly flow of the circulating working fluid among multiple sets of double-acting free piston thermoacoustic Stirling heat pump units is completed, continuously driving the stable operation of the heat pump cycle.

[0023] This structural design, employing a contactless magnetic coupling transmission architecture comprised of a magnetic rotor assembly and a magnetic screw, eliminates mechanical friction losses at their source, effectively improving transmission efficiency and avoiding problems such as short equipment lifespan, high maintenance costs, and poor piston movement synchronization caused by mechanical wear. Simultaneously, the rotary drive mechanism replaces the multiple dedicated high-precision linear motors and complex synchronous control systems required by traditional linear compressor drive schemes, significantly reducing system equipment costs, integration difficulty, and control complexity. It also boasts high power density and wide operating condition adaptability, effectively meeting the application requirements of high-power industrial heat pumps. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a simplified structural diagram of the heat pump system provided by the present invention. Figure 1 .

[0026] Figure 2 This is a simplified structural diagram of the heat pump system provided by the present invention. Figure 2 .

[0027] Reference numerals: 100, Double-acting free-piston type thermosonic Stirling heat pump unit; 110, Piston connecting rod; 120, Cylinder block; 130, High-temperature heat exchanger; 140, Regenerator; 150, Low-temperature heat exchanger; 160, Compression chamber; 170, Expansion chamber; 200, Magnetic screw; 300, Magnetic rotor assembly; 400, Rotary drive mechanism; 500, Housing. Detailed Implementation

[0028] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0029] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0031] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] In the description of this specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate different embodiments or examples and features of different embodiments or examples described in this specification to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer. The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] The following is combined Figure 1 and Figure 2 A heat pump system provided by an embodiment of the present invention will be described below. It should be understood that the following description is merely an illustrative embodiment of the present invention and does not constitute any particular limitation on the present invention.

[0034] An embodiment of the present invention provides a heat pump system, such as Figure 1 and Figure 2 As shown, it includes: multiple sets of double-acting free piston type thermoacoustic Stirling heat pump units 100, which are connected to each other through gas ducts to form a closed working fluid circulation loop. Each double-acting free piston type thermoacoustic Stirling heat pump unit 100 includes a piston connecting rod 110; multiple magnetic screws 200, which are connected to the piston connecting rods 110 in a one-to-one correspondence; a magnetic rotor assembly 300, which is magnetically coupled to each magnetic screw 200 without contact; and a rotary drive mechanism 400, which is connected to the magnetic rotor assembly 300.

[0035] The rotary drive mechanism 400 is used to drive the magnetic rotor assembly 300 to rotate, and drives each magnetic screw 200 to reciprocate linearly through magnetic coupling.

[0036] In other words, the heat pump system provided by this invention includes multiple sets of double-acting free-piston thermoacoustic Stirling heat pump units 100. Each double-acting free-piston thermoacoustic Stirling heat pump unit 100 is sequentially connected through a gas conduit to form a closed loop for the flow of circulating working fluid. Each set of double-acting free-piston thermoacoustic Stirling heat pump units 100 is equipped with a piston connecting rod 110 for driving the compression and expansion of the working fluid. The system is provided with multiple magnetic screws 200 fixedly connected to the piston connecting rods 110 one-to-one, and a magnetic rotor assembly 300 that can form a non-contact magnetic coupling with each magnetic screw 200. The magnetic rotor assembly 300 is connected to a rotary drive mechanism 400. The rotational power output by the rotary drive mechanism 400 can be converted into the axial reciprocating linear motion of each magnetic screw 200 through the magnetic field coupling between the magnetic rotor assembly 300 and the magnetic screws 200 without contact, ultimately driving the corresponding piston connecting rod 110 to synchronously complete the reciprocating linear motion, driving the heat pump to continuously operate in a cycle.

[0037] During operation, the rotary drive mechanism 400 outputs rotational power, driving the connected magnetic rotor assembly 300 to rotate synchronously. Through the non-contact magnetic coupling between the magnetic rotor assembly 300 and each magnetic screw 200, the circular rotational motion is converted into the axial reciprocating linear motion of each magnetic screw 200. This, in turn, drives the piston connecting rod 110, which is connected to the magnetic screw 200 one by one, to perform synchronous reciprocating linear motion within the double-acting free piston thermoacoustic Stirling heat pump unit 100. The movement of the piston connecting rod 110 changes the chamber volume within the double-acting free piston thermoacoustic Stirling heat pump unit 100, thereby achieving compression and expansion of the circulating working fluid. In conjunction with the closed working fluid circulation loop formed by the connection of each double-acting free piston thermoacoustic Stirling heat pump unit 100 through the gas duct, the orderly flow of the circulating working fluid among multiple sets of double-acting free piston thermoacoustic Stirling heat pump units 100 is completed, continuously driving the heat pump to operate stably.

[0038] This structural design, comprising the magnetic rotor assembly 300 and the magnetic screw 200, creates a contactless magnetic coupling transmission architecture that eliminates mechanical friction losses at the source. This increases transmission efficiency to over 95%, avoiding problems such as short equipment lifespan, high maintenance costs, and poor piston movement synchronization caused by mechanical wear. It can extend system lifespan by 3-5 times and reduce maintenance costs by over 60%. Furthermore, the rotary drive mechanism 400 replaces the multiple dedicated high-precision linear motors and complex synchronous control systems required by traditional linear compressor drive schemes, significantly reducing system equipment costs, integration difficulty, and control complexity. It also boasts high power density and wide operating condition adaptability, effectively meeting the application requirements of high-power industrial heat pumps.

[0039] In one embodiment of the present invention, the double-acting free-piston type thermoacoustic Stirling heat pump unit 100 further includes: a cylinder 120, with a piston connecting rod 110 slidably connected to the inner cavity of the cylinder 120, so that the inner cavity of the cylinder 120 is divided into a compression chamber 160 and an expansion chamber 170; a high-temperature heat exchanger 130, which is connected to the compression chamber 160; a regenerator 140, which is connected to the high-temperature heat exchanger 130; and a low-temperature heat exchanger 150, which is connected to the regenerator 140 and is connected to the expansion chamber 170 of an adjacent double-acting free-piston type thermoacoustic Stirling heat pump unit 100 through a gas duct.

[0040] Furthermore, in one embodiment of the present invention, the heat pump system further includes: a housing 500, a cylinder 120, a rotary drive mechanism 400, a magnetic rotor assembly 300, and a magnetic screw 200, all of which are covered by the housing 500.

[0041] Specifically, in Figure 1 and Figure 2 In the illustrated embodiment, the heat pump system is equipped with four sets of double-acting free-piston thermoacoustic Stirling heat pump units 100. Each set of double-acting free-piston thermoacoustic Stirling heat pump unit 100 includes a cylinder 120, a piston connecting rod 110, a high-temperature heat exchanger 130, a regenerator 140, and a low-temperature heat exchanger 150.

[0042] The cylinder body 120 is a pressure-bearing cavity structure closed at both ends. The piston connecting rod 110 includes a piston part and a connecting rod part that are coaxially and integrally arranged. The piston part is coaxially and slidably assembled in the inner cavity of the cylinder body 120, and the outer wall of the piston part and the inner wall of the cylinder body 120 are fitted with a clearance seal. The piston part divides the inner cavity of the cylinder body 120 into two independent compression chambers 160 and expansion chambers 170. The compression chamber 160 is located on the side of the piston part away from the magnetic screw 200, and the expansion chamber 170 is located on the side of the piston part facing the magnetic screw 200. The connecting rod part is housed in the cavity where the expansion chamber 170 is located. The end of the connecting rod part away from the piston part extends towards the magnetic screw 200, protrudes out of the cylinder body 120, and is coaxially and integrally fixedly connected to the corresponding magnetic screw 200. The inner wall of the cylinder body 120 is provided with a ceramic wear-resistant coating.

[0043] High-temperature heat exchanger 130, regenerator 140, and low-temperature heat exchanger 150 are connected in series. The working fluid-side inlet of high-temperature heat exchanger 130 is connected to the compression chamber 160 of this double-acting free-piston thermoacoustic Stirling heat pump unit 100, the working fluid-side outlet of high-temperature heat exchanger 130 is connected to the hot-side inlet of regenerator 140, the cold-side outlet of regenerator 140 is connected to the working fluid-side inlet of low-temperature heat exchanger 150, and the working fluid-side outlet of low-temperature heat exchanger 150 is connected to the expansion chamber 170 of the adjacent double-acting free-piston thermoacoustic Stirling heat pump unit 100 via a gas conduit, thus forming a closed-loop working fluid flow channel across units. Regenerator 140 is a porous heat storage structure filled with metal wire mesh, metal filaments, or metal particles, which can alternately complete heat absorption and release during circulation, realizing efficient recovery and utilization of working fluid heat energy. Both the high-temperature heat exchanger 130 and the low-temperature heat exchanger 150 adopt a modular design, allowing the heat exchange medium and heat exchange structure to be replaced according to actual working conditions, adapting to different heat sources and heat sink scenarios.

[0044] The closed working fluid circulation loop is filled with a circulating working fluid, which can be any one of helium, hydrogen, nitrogen, or air, or a mixture of the above gases. The working fluid has the characteristics of high thermal conductivity and low viscosity, which can effectively improve the thermoacoustic conversion efficiency of the system.

[0045] When the system is running, the rotary drive mechanism 400 drives the magnetic rotor assembly 300 to rotate. Through magnetic coupling, the magnetic screws 200 of the four sets of double-acting free piston thermoacoustic Stirling heat pump units 100 are driven to reciprocate linearly in sync according to a preset phase difference. Then, through the connecting rod part, the piston part is driven to reciprocate synchronously in the cylinder 120. In conjunction with the closed-loop working fluid circulation loop, the compression, heat release, heat recovery, heat absorption, and expansion processes of the Stirling cycle are completed synchronously in the four sets of double-acting free piston thermoacoustic Stirling heat pump units 100.

[0046] Through the coordinated operation of four sets of double-acting free piston thermoacoustic Stirling heat pump units 100, the system can continuously recover low-grade heat energy and output high-grade heat energy, achieving a stable heat pump heating cycle. When the rotary drive mechanism 400 switches directions, the movement sequence of the piston connecting rod 110 is reversed, the acoustic power flow direction of the working fluid circulation is synchronously reversed with the heat pumping direction, the functions of the high-temperature heat exchanger 130 and the low-temperature heat exchanger 150 are interchanged, and the system can be switched to cooling / heat dissipation mode operation.

[0047] The heat pump system also includes a pressure-bearing housing 500, which is a sealed and pressure-bearing integrated cavity structure. The rotary drive mechanism 400, the magnetic rotor assembly 300, and all the magnetic screws 200 are built into the inner cavity of the pressure-bearing housing 500. The side wall of the pressure-bearing housing 500 is sealed and fixedly connected to the end near the cylinder 120 of each double-acting free piston thermosonic Stirling heat pump unit 100, i.e., the end where the expansion chamber 170 is located, so that the inner cavity of the pressure-bearing housing 500 is connected to the side space of the expansion chamber 170 of each cylinder 120, forming a unified sealed and pressure-bearing space.

[0048] This structural design physically isolates the core drive unit from the high-temperature heat exchange zone of the heat pump cycle. Combined with the reversible adjustment of the heat pump direction, this ensures the rotary drive mechanism 400 operates in a room-temperature working fluid environment, completely avoiding the impact of high-temperature conditions on the performance of core components such as the motor coils and permanent magnets. This eliminates the need for a dedicated high-temperature compressor, reducing overall equipment costs by approximately 40%. Furthermore, the drive unit is fully integrated within the pressure-bearing housing 500, eliminating the need for the dynamic seals and piston ring seals found in traditional structures that penetrate the cylinder 120. This completely eliminates the risk of working fluid leakage due to seal wear, further improving the system's sealing reliability, structural compactness, and overall operating efficiency.

[0049] In other embodiments of the present invention, the number of dual-acting free piston thermoacoustic Stirling heat pump units 100 can be set to three or more. Each dual-acting free piston thermoacoustic Stirling heat pump unit 100 can be connected in series or arranged in opposition to each other, so as to offset the vibration and torque generated during system operation, further reduce the overall operating noise and vibration load, and improve the operating stability of the equipment.

[0050] In one embodiment of the present invention, the magnetic rotor assembly 300 includes: a rotor body; a plurality of first N-pole magnets; and a plurality of first S-pole magnets.

[0051] The first N-pole magnet and the first S-pole magnet are arranged alternately in a spiral pattern on the inner ring sidewall of the rotor body.

[0052] The magnetic screw 200 includes: an inner rod body; multiple second N-pole magnets; multiple second S-pole magnets; and the second N-pole magnets and second S-pole magnets are arranged alternately in a spiral pattern on the outer side wall of the inner rod body.

[0053] For example, the rotor body is a hollow cylindrical rigid load-bearing structure, and its end is coaxially and fixedly connected to the output shaft of the rotary drive mechanism 400, so that it can rotate synchronously with the rotary drive mechanism 400 in the forward or reverse direction. The inner ring sidewall of the rotor body has an insert groove that matches the size of the permanent magnet. Multiple first N-pole magnets and multiple first S-pole magnets are alternately and continuously spirally fixedly inserted into the insert groove, forming a complete spiral permanent magnet array in the inner ring of the rotor body.

[0054] The magnetization method of the first N-pole magnet and the first S-pole magnet can be any one of normal magnetization, longitudinal magnetization, or mixed magnetization. In this embodiment, the Halbach magnetization array arrangement is preferred, which can effectively enhance the magnetic field coupling strength, reduce end magnetic leakage, and greatly improve the stability and dynamic response speed of magnetic transmission.

[0055] The magnetic screw 200 includes an inner rod body, multiple second N-pole magnets, and multiple second S-pole magnets. One end of the inner rod body facing the double-acting free-piston thermosonic Stirling heat pump unit 100 is coaxially and integrally fixedly connected to the connecting rod portion of the corresponding piston connecting rod 110; the other end, facing away from the piston connecting rod 110, extends into the inner cavity of the rotor body. The outer wall of the inner rod body has an insert groove matching the size of the permanent magnets. Multiple second N-pole magnets and multiple second S-pole magnets are alternately and continuously spirally fixedly inserted into the insert groove, forming a spiral permanent magnet array matching the magnetic rotor assembly 300 on the outer ring of the inner rod body.

[0056] The magnetization method for the second N-pole magnet and the second S-pole magnet can be any one of normal magnetization, longitudinal magnetization, or mixed magnetization, with Halbach magnetization array being preferred.

[0057] The magnetic screw 200 is also equipped with a guide nut and a magnetic ring. The guide nut is fixed at the connection position between the pressure housing 500 and the cylinder 120 and slides with the outer wall of the inner rod to limit the circumferential rotation of the magnetic screw 200, ensuring that it can only make reciprocating linear motion along the axial direction, and avoiding magnetic coupling failure caused by circumferential deflection. The magnetic ring is located at the axial end of the helical permanent magnet array to constrain the magnetic field path and further reduce leakage magnetic loss.

[0058] When the system is running, the rotary drive mechanism 400 drives the magnetic rotor assembly 300 to rotate. The spiral permanent magnet array in the inner circle of the rotor body generates a synchronously rotating magnetic field. Through the interaction force between the magnetic poles, the rotational motion is transmitted to the magnetic screw 200 without contact via magnetic coupling. Under the circumferential limiting action of the guide nut, the magnetic pull of the rotating magnetic field is converted into an axial driving force, which drives the magnetic screw 200 to reciprocate linearly along the axial direction. In turn, the connecting rod drives the piston to reciprocate synchronously within the cylinder 120, providing stable driving power for the Stirling heat pump cycle.

[0059] In one embodiment of the present invention, there is one magnetic rotor assembly 300 and one rotary drive mechanism 400, which is connected to the rotor body; each magnetic screw 200 is arranged circumferentially to the inner ring of the rotor body.

[0060] Furthermore, each magnetic screw 200 is arranged in a staggered manner along its axis.

[0061] Specifically, such as Figure 1 As shown, this embodiment adopts a single-drive centralized transmission architecture, which only sets up a rotary drive mechanism 400 and a magnetic rotor assembly 300 to synchronously drive the piston connecting rods 110 of multiple sets of double-acting free piston thermoacoustic Stirling heat pump units 100 to complete reciprocating linear motion.

[0062] The rotary drive mechanism 400 can be a variable frequency speed-regulating permanent magnet synchronous motor, which is built into the inner cavity of the pressure housing 500. Its stator is fixedly connected to the inner wall of the pressure housing 500, and its output shaft is coaxially fixedly connected to the axial end of the rotor body. It can directly drive the rotor body to perform synchronous forward or reverse rotation.

[0063] Each magnetic screw 200 is evenly spaced along the circumference of the rotor body, extending entirely within the hollow inner cavity of the rotor body. The central axis of each magnetic screw 200 is parallel to the central axis of the rotor body, and the helical permanent magnet array on the outer ring of each magnetic screw 200 is arranged relative to the helical permanent magnet array on the inner ring of the rotor body, forming a stable, non-contact magnetic coupling. The number of magnetic screws 200 corresponds exactly one-to-one with the number of double-acting free piston type thermoacoustic Stirling heat pump units 100.

[0064] With this single-drive centralized structure, only a single rotary drive mechanism 400 is needed to synchronously drive multiple sets of double-acting free piston thermoacoustic Stirling heat pump units 100. There is no need to configure a separate drive device for each set of double-acting free piston thermoacoustic Stirling heat pump units 100, nor is there a need for the complex multi-axis synchronous control system required by traditional linear compressor solutions. This greatly simplifies the system structure, improves system integration and operational reliability, and also has the advantage of high power density. It can easily meet the application requirements of industrial high-temperature heat pumps ranging from hundreds of kilowatts to several megawatts, breaking through the power upper limit bottleneck of traditional linear compressor solutions.

[0065] Furthermore, each magnetic screw 200 is arranged in a staggered manner along the axial direction of the rotor body. That is, there is a preset fixed misalignment between the axial installation positions of adjacent magnetic screws 200. This axial misalignment matches the pitch of the helical permanent magnet array on the rotor body and magnetic screws 200, as well as the piston movement phase difference required for the double-acting Stirling cycle. Through this axial misalignment, the piston connecting rods 110 of the four sets of double-acting free piston thermoacoustic Stirling heat pump units 100 can complete the reciprocating motion in an orderly manner according to the preset phase difference. This allows the compression, heat release, heat recovery, heat absorption, and expansion processes in each double-acting free piston thermoacoustic Stirling heat pump unit 100 to be sequentially connected and continuously carried out, ensuring the stable and continuous operation of the closed-loop working fluid cycle and avoiding system pressure fluctuations and cycle interruptions caused by the synchronous movement of multiple sets of pistons. At the same time, the reciprocating motion with the preset phase difference can effectively counteract the inertial force generated by the movement of multiple sets of pistons, reduce system vibration and noise, and improve the service life of the entire machine.

[0066] In one embodiment of the present invention, there are multiple magnetic rotor assemblies 300 and multiple rotary drive mechanisms 400; each rotary drive mechanism 400 is connected to each rotor body in a one-to-one correspondence, and each magnetic screw 200 is arranged in a one-to-one correspondence to the inner ring of each rotor body.

[0067] exist Figure 2 In the embodiment shown, a multi-drive distributed independent transmission architecture is adopted. The number of rotary drive mechanism 400, magnetic rotor assembly 300, magnetic screw 200 and double-acting free piston thermoacoustic Stirling heat pump unit 100 are equal and are set up one-to-one, forming multiple sets of mutually independent drive transmission modules.

[0068] In each independent drive transmission module, the output shaft of the rotary drive mechanism 400 is coaxially and fixedly connected to the axial end of the rotor body of the corresponding magnetic rotor assembly 300, enabling independent drive of the rotor body to rotate in either the forward or reverse direction. A single magnetic screw 200 corresponding to the rotor body is coaxially arranged within the hollow inner ring of the rotor body. The helical permanent magnet array on the outer ring of the magnetic screw 200 is arranged opposite to the helical permanent magnet array on the inner ring of the rotor body, forming a one-to-one non-contact magnetic coupling. The end of the magnetic screw 200 facing the double-acting free piston type thermosonic Stirling heat pump unit 100 is coaxially and integrally fixedly connected to the piston connecting rod 110 of the corresponding double-acting free piston type thermosonic Stirling heat pump unit 100, ultimately forming an independent drive link of single rotary drive mechanism 400 - single magnetic rotor assembly 300 - single magnetic screw 200 - single double-acting free piston type thermosonic Stirling heat pump unit 100, with each drive link operating independently without interference.

[0069] Multiple drive transmission modules and corresponding double-acting free piston thermoacoustic Stirling heat pump units 100 can be flexibly arranged according to actual installation space and working conditions. They can be arranged in various ways, such as circumferential uniform symmetrical arrangement, opposite arrangement, or sequential series arrangement. They are not subject to the circumferential space constraints of a centralized rotor, which greatly reduces the difficulty of the drive shaft arrangement and overall structural layout of the multi-unit system.

[0070] When the system is running, the rotary drive mechanism 400 of each drive transmission module outputs rotational power synchronously according to preset control parameters, driving the corresponding magnetic rotor assembly 300 to perform synchronous rotational motion; each rotor body independently converts the rotational motion into the axial reciprocating linear motion of the magnetic screw 200 through its own magnetic coupling with the corresponding magnetic screw 200, thereby driving the piston connecting rod 110 of the corresponding double-acting free piston thermoacoustic Stirling heat pump unit 100 to complete synchronous reciprocating motion.

[0071] In one embodiment of the present invention, when the rotary drive mechanism 400 rotates in the forward direction, the heat pump system is in a high-temperature heat pump heating mode, and the corresponding high-temperature heat exchanger 130 is located at the upper end of the regenerator 140; when the rotary drive mechanism 400 rotates in the reverse direction, the heat pump system is in a cooling mode or a conventional heat pump mode, and the corresponding high-temperature heat exchanger 130 is located at the lower end of the regenerator 140 and connected to the compressor.

[0072] In another embodiment of the present invention, the heat pump system further includes: a first temperature sensor connected to the high-temperature heat exchanger 130; and a controller connected to the first temperature sensor and the rotary drive mechanism 400, used to adjust the working state of the rotary drive mechanism 400 based on the detection result of the first temperature sensor in the high-temperature heat pump heating mode.

[0073] Furthermore, the heat pump system also includes: a second temperature sensor connected to the low-temperature heat exchanger 150; and a controller used to adjust the operating state of the rotary drive mechanism 400 based on the detection result of the second temperature sensor in either cooling mode or conventional heat pump mode.

[0074] Specifically, the heat pump system can freely switch between cooling mode, conventional heat pump mode, and high-temperature heat pump heating mode by controlling the rotation direction of the rotary drive mechanism 400, adapting to different needs.

[0075] When the rotary drive mechanism is rotating in the forward direction, the system is in the high-temperature heat pump heating mode: the rotary drive mechanism 400 drives the magnetic rotor assembly 300 to rotate in the forward direction, and drives each magnetic screw 200 to drive the piston connecting rod 110 to perform reciprocating linear motion according to the preset timing of the heating cycle through magnetic coupling. At this time, the high-temperature heat exchanger 130 is located at the upper end of the regenerator 140, matching the working fluid flow direction of the heating cycle, so that the energy flow direction of the working fluid cycle is to absorb low-grade heat energy from the low-temperature heat exchanger 150, complete heat storage and heat exchange through the regenerator 140, and after compression and heating in the compression chamber 160, output high-grade heat energy through the high-temperature heat exchanger 130, thereby realizing the grade improvement of low-grade heat energy and stable heating.

[0076] When the rotary drive mechanism 400 is rotating in the opposite direction, the system is in either cooling mode or conventional heat pump mode: the rotary drive mechanism 400 drives the magnetic rotor assembly 300 to rotate in the opposite direction, and the reciprocating motion sequence of the piston connecting rod 110 is completely reversed. At this time, the high-temperature heat exchanger 130 switches to the lower end of the regenerator 140 and connects to the compressor, adapting to the operating conditions of cooling / conventional heat pump mode. This causes the acoustic energy flow direction of the Stirling cycle to be synchronously reversed with the heat pumping direction. The high-temperature heat exchanger 130 and the low-temperature heat exchanger 150 of the double-acting free piston thermoacoustic Stirling heat pump unit 100 exchange functions. The energy flow direction of the working fluid cycle changes to absorbing heat from the ambient side and outputting cold energy to the outside through the low-temperature heat exchanger 150, thus realizing the cooling / heat dissipation function.

[0077] The heat pump system also includes a first temperature sensor, a second temperature sensor, and a controller for precise control of operating conditions.

[0078] The first temperature sensor is correspondingly set to the high-temperature heat exchanger 130 of each double-acting free piston thermoacoustic Stirling heat pump unit 100 in the system. Specifically, it is arranged in the working fluid side flow channel or the inlet and outlet position of the heat exchange medium of the high-temperature heat exchanger 130. It is used to collect the operating temperature signal of the high-temperature heat exchanger 130 in real time and provide data basis for the closed-loop control of the high-temperature heat pump heating mode.

[0079] The second temperature sensor is correspondingly set to the low-temperature heat exchanger 150 of each double-acting free piston thermoacoustic Stirling heat pump unit 100 in the system. Specifically, it is arranged in the working fluid side flow channel or the inlet and outlet position of the heat exchange medium of the low-temperature heat exchanger 150. It is used to collect the operating temperature signal of the low-temperature heat exchanger 150 in real time and provide data basis for closed-loop control in cooling mode or conventional heat pump mode.

[0080] The controller's signal input terminal is electrically connected to the first temperature sensor and the second temperature sensor to receive the two temperature detection results in real time; the controller's control output terminal is electrically connected to the rotary drive mechanism 400 and can output steering control commands and speed adjustment commands to the rotary drive mechanism 400 to realize the closed-loop adjustment of working mode switching and operating status.

[0081] When the system is in high-temperature heat pump heating mode, the controller uses the temperature signal of the high-temperature heat exchanger 130 collected by the first temperature sensor as the core control basis to execute closed-loop heating control: the controller compares the real-time collected temperature value of the high-temperature heat exchanger 130 with the preset heating target temperature, and adjusts the working speed of the rotary drive mechanism 400 in real time according to the temperature deviation value, thereby adjusting the reciprocating frequency of the piston connecting rod 110 and the working fluid circulation rate, ultimately achieving precise control of the heating output temperature and output power. When the detected temperature is lower than the target temperature, the rotation speed of the rotary drive mechanism 400 is increased to increase the heating power, which can adapt to a wide range of heating temperature requirements from 50-200℃ to meet the heating requirements of different industrial scenarios; when the detected temperature reaches or exceeds the target temperature, the rotation speed of the rotary drive mechanism 400 is reduced to stabilize the output temperature and ensure the stable and efficient operation of the system under heating conditions.

[0082] When the system is in cooling mode or conventional heat pump mode, the controller uses the temperature signal of the low-temperature heat exchanger 150 collected by the second temperature sensor as the core control basis to execute closed-loop cooling control: the controller compares the real-time collected temperature value of the low-temperature heat exchanger 150 with the preset cooling target temperature, and adjusts the working speed of the rotary drive mechanism 400 in real time according to the temperature deviation value, thereby adjusting the reciprocating frequency of the piston connecting rod 110 and the working fluid circulation rate, ultimately achieving precise control of the cooling output temperature and cooling power. When the detected temperature is higher than the target cooling temperature, the speed of the rotary drive mechanism 400 is increased to increase the cooling power; when the detected temperature reaches or falls below the target temperature, the speed of the rotary drive mechanism 400 is reduced to stabilize the cooling output and ensure stable and efficient operation of the system under cooling conditions.

[0083] In addition, a sensor for detecting the rotational speed of the rotating mechanism is provided. Based on the feedback signal from the speed sensor, the controller performs closed-loop speed control on the rotating drive mechanism 400. This can accurately control the actual operating speed of the rotating drive mechanism 400 to match the target speed, thereby accurately controlling the reciprocating frequency and stroke of the piston connecting rod 110. This ensures the stability and control accuracy of the heat pump cycle and avoids deviations in heating / cooling effects caused by speed fluctuations.

[0084] In another extended embodiment of the present invention, multiple sets of double-acting free piston thermoacoustic Stirling heat pump units 100 can be designed with variable temperature output. By differentiating the operating parameters of each double-acting free piston thermoacoustic Stirling heat pump unit 100, the energy of the heat source can be utilized in stages to achieve heating output in multiple temperature zones, further improving the efficiency of heat energy utilization and adapting to the needs of industrial scenarios with multi-gradient heat use.

[0085] The heat pump system provided by this invention can be widely used in industrial waste heat recovery, chemical process heating, and district centralized heating, and has significant energy-saving and carbon reduction benefits. It is perfectly suited to the high-power, wide-condition high-temperature heat pump application needs in the industrial field.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heat pump system, characterized in that, The heat pump system includes: Multiple sets of double-acting free piston type thermoacoustic Stirling heat pump units (100) are connected to each other through gas ducts to form a closed working fluid circulation loop. Each double-acting free piston type thermoacoustic Stirling heat pump unit (100) includes a piston connecting rod (110). Multiple magnetic screws (200) are connected one-to-one with the piston connecting rod (110); A magnetic rotor assembly (300) is magnetically coupled to each of the magnetic screws (200) without contact. A rotary drive mechanism (400) is connected to the magnetic rotor assembly (300); The rotary drive mechanism (400) is used to drive the magnetic rotor assembly (300) to rotate and drive each of the magnetic screws (200) to reciprocate linearly through magnetic coupling.

2. The heat pump system according to claim 1, characterized in that, The double-acting free piston type thermoacoustic Stirling heat pump unit (100) also includes: The cylinder (120) has the piston connecting rod (110) slidably connected to its inner cavity, so that the inner cavity of the cylinder (120) is divided into a compression chamber (160) and an expansion chamber (170). A high-temperature heat exchanger (130) is connected to the compression chamber (160); A regenerator (140) is connected to the high-temperature heat exchanger (130); The low-temperature heat exchanger (150) is connected to the regenerator (140) and is connected to the expansion chamber (170) of the adjacent double-acting free piston thermoacoustic Stirling heat pump unit (100) through the gas duct.

3. The heat pump system according to claim 2, characterized in that, The heat pump system also includes: The housing (500), the cylinder (120), the rotary drive mechanism (400), the magnetic rotor assembly (300) and the magnetic screw (200) are all covered by the housing (500).

4. The heat pump system according to claim 1, characterized in that, The magnetic rotor assembly (300) includes: Rotor body; Multiple first N-pole magnets; Multiple first S-pole magnets; The first N-pole magnet and the first S-pole magnet are arranged alternately in a spiral pattern on the inner ring sidewall of the rotor body; The magnetic screw (200) includes: Inner rod; Multiple second N-pole magnets; Multiple second S-pole magnets; The second N-pole magnet and the second S-pole magnet are arranged alternately in a spiral pattern on the outer side wall of the inner rod.

5. The heat pump system according to claim 4, characterized in that, The number of magnetic rotor assemblies (300) is one, the number of rotary drive mechanisms (400) is one, and the rotary drive mechanism (400) is connected to the rotor body; Each of the magnetic screws (200) is arranged circumferentially at intervals to the inner ring of the rotor body.

6. The heat pump system according to claim 5, characterized in that, The magnetic screws (200) are arranged axially offset from each other.

7. The heat pump system according to claim 4, characterized in that, The number of magnetic rotor assemblies (300) is multiple, and the number of rotary drive mechanisms (400) is multiple; Each of the rotary drive mechanisms (400) is connected to each of the rotor bodies in a one-to-one correspondence, and each of the magnetic screws (200) is arranged in a one-to-one correspondence to the inner ring of each of the rotor bodies.

8. The heat pump system according to claim 2, characterized in that, When the rotary drive mechanism (400) is rotating in the forward direction, the heat pump system is in high-temperature heat pump heating mode, and the corresponding high-temperature heat exchanger (130) is located at the upper end of the regenerator (140); when the rotary drive mechanism (400) is rotating in the reverse direction, the heat pump system is in cooling mode or conventional heat pump mode, and the corresponding high-temperature heat exchanger (130) is located at the lower end of the regenerator (140) and connected to the compressor.

9. The heat pump system according to claim 8, characterized in that, The heat pump system also includes: A first temperature sensor is connected to the high-temperature heat exchanger (130); A controller, which is connected to the first temperature sensor and the rotary drive mechanism (400), is used to adjust the working state of the rotary drive mechanism (400) based on the detection result of the first temperature sensor in the high-temperature heat pump heating mode.

10. The heat pump system according to claim 9, characterized in that, The heat pump system also includes: A second temperature sensor is connected to the low-temperature heat exchanger (150); The controller is used to adjust the operating state of the rotary drive mechanism (400) based on the detection result of the second temperature sensor in the cooling mode or the conventional heat pump mode.

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