Active phase modulation type GM pulse tube refrigerator

Abstract

The utility model discloses an active phase modulation type GM pulse tube refrigerator which comprises an active phase modulation mechanism, a cold finger assembly, a compressor and a phase modulation connecting pipe, the active phase modulation mechanism is connected to the cold finger assembly through the phase modulation connecting pipe, the cold finger assembly is connected to the compressor through a helium pipe, and a rotary valve is further arranged on the helium pipe. The active phase modulation mechanism comprises a phase modulation piston, and an air cylinder is arranged on the outer side of the phase modulation piston; the active phase modulation linear motor drives the phase modulation piston to do axial reciprocating motion, and the phase modulation piston can do reciprocating motion in the air cylinder to form pressure waves. The active phase modulation mechanism is driven by the linear motor, active phase modulation is achieved by adjusting motor parameters and controlling the phase, displacement and frequency of the phase modulation piston, the mass flow and the pressure wave of the hot end of the pulse tube reach the optimal phase angle, high efficiency of the whole machine is achieved, the low-frequency active phase modulation mechanism is adopted, acoustic power of the hot end of the pulse tube can be recycled while active phase modulation is conducted, and the energy consumption is reduced. And the overall efficiency is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigerators, in particular to an actively phase - adjusted GM pulse tube refrigerator. Background Art

[0002] With the rapid development of modern science and technology such as aerospace, quantum computing, and infrared detection technology, it has also promoted the progress and development of cryogenic refrigeration technology. The pre - cooling systems of quantum computing and quantum communication require cryogenic refrigerators with long life and low vibration interference, mainly GM pulse tube refrigerators. According to different cooling capacities and temperature ranges, there are different types of refrigerators such as single - stage and multi - stage. Pulse tube refrigerators have a simple structure, and the cold finger assembly has no moving parts, with inherent advantages such as high reliability, long life, and low vibration interference. However, traditional pulse tube refrigerators have problems such as low efficiency and cannot meet the current engineering requirements.

[0003] Therefore, it is urgent to solve the problem of low efficiency of pulse tube refrigerators. The efficiency of traditional pulse tube refrigerators is lower than that of Stirling refrigerators. The reason is that the acoustic power at the hot end cannot be recovered like that of Stirling refrigerators through a moving expeller or piston, but is dissipated in the form of waste heat at phase - adjustment mechanisms such as the inertia tube and the bi - directional intake pipe. Utilizing the work recovery technology path can improve the refrigeration efficiency and make up for the disadvantage of low pulse tube refrigeration efficiency.

[0004] The existing phase - adjustment mechanisms of GM pulse tube refrigerators are mostly of the bi - directional intake type or the small - hole phase - adjustment type and the combined phase - adjustment method of the two. It is easy to form a circulation between the pulse tube and the regenerator, causing instability of the refrigeration temperature, that is, the "direct - current" phenomenon. In addition, since the acoustic power at the hot end is dissipated in the form of waste heat at phase - adjustment mechanisms such as the bi - directional intake pipe or small holes, the efficiency of the pulse tube refrigerator is low. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is: how to provide a low - frequency active phase - adjustment mechanism that recovers the acoustic power at the hot end while actively adjusting the phase, thereby greatly improving the refrigeration efficiency.

[0006] To solve the above - mentioned technical problem, the utility model provides the following technical solutions:

[0007] An actively phase - adjusted GM pulse tube refrigerator includes an active phase - adjustment mechanism, a cold finger assembly, a compressor, and a phase - adjustment connecting pipe. The active phase - adjustment mechanism is connected to the cold finger assembly through the phase - adjustment connecting pipe, and the cold finger assembly is connected to the compressor through a helium pipe, and a rotary valve is also provided on the helium pipe;

[0008] The active phase - adjustment mechanism includes a phase - adjustment piston. A framework is connected above the phase - adjustment piston, and an active phase - adjustment linear motor is arranged outside the framework. A cylinder is arranged outside the phase - adjustment piston, and the active phase - adjustment linear motor is arranged on the cylinder;

[0009] The active phase modulation linear motor drives the phase modulation piston to perform axial reciprocating motion, and the phase modulation piston can reciprocate in the cylinder to form a pressure wave.

[0010] The active phase modulation mechanism of this application is a low-frequency active phase modulation mechanism driven by a linear motor. Under the action of alternating current, an alternating magnetic field is formed to drive the phase modulation piston to reciprocate. The parameters of the alternating current can be controlled to adjust the phase, displacement and operating frequency of the phase modulation piston, realizing the active phase modulation function; the size, weight of the phase modulation piston, and the length and diameter of the phase modulation connecting pipe are all adjustable. By adjusting the matching of various parameters, the best phase angle between the pressure wave and the mass flow at the hot end of the pulse tube can be obtained, thereby improving the efficiency and realizing the high efficiency of the whole machine; by adopting the low-frequency active phase modulation mechanism, the acoustic power at the hot end of the pulse tube can be recovered while actively modulating the phase, further improving the efficiency of the whole machine, so as to realize a GM pulse tube refrigerator with high reliability and high refrigeration efficiency.

[0011] As a further solution of the present utility model: the active phase modulation mechanism includes a single-piston active phase modulation mechanism and a double-piston opposed active phase modulation mechanism;

[0012] Among them, in the single-piston active phase modulation mechanism, the phase modulation assembly formed by the active phase modulation linear motor, the phase modulation piston, the cylinder and the skeleton is installed in the housing of the single-piston active phase modulation mechanism;

[0013] Among them, in the double-piston opposed active phase modulation mechanism, the cylinder is replaced by an opposed cylinder, and the phase modulation assembly formed by the active phase modulation linear motor, the phase modulation piston and the skeleton is symmetrically installed in the housing of the double-piston opposed active phase modulation mechanism.

[0014] As a further solution of the present utility model: in the double-piston opposed active phase modulation mechanism, a compression chamber is formed between the two phase modulation assemblies, and a back pressure chamber is formed between the outer ends of the two phase modulation assemblies and the housing.

[0015] As a further solution of the present utility model: the active phase modulation linear motor includes an inner stator, an outer stator, a coil and a permanent magnet. The permanent magnet is bonded to the skeleton, and the inner stator is fixed on the thin-walled outer circle of the cylinder; the outer stator is sleeved on the coil and fixed on the flange end face of the cylinder.

[0016] As a further solution of the present utility model: a low-frequency alternating current is input into the coil to form an alternating magnetic field; the permanent magnet can drive the connected phase modulation piston to perform axial reciprocating motion under the action of the alternating magnetic field force.

[0017] As a further solution of the present utility model: The cold finger assembly adopts a first-stage cold finger assembly, and the first-stage cold finger assembly includes a first-stage regenerator hot end heat exchanger, a first-stage regenerator, a first-stage regenerator cold end heat exchanger, a first-stage connecting pipe, a first-stage pulse tube cold end heat exchanger, a first-stage pulse tube, and a first-stage pulse tube hot end heat exchanger that are connected in sequence. The first-stage regenerator hot end heat exchanger is connected to the first-stage helium pipe, and the first-stage pulse tube hot end heat exchanger is connected to the phase adjustment connecting pipe.

[0018] As a further solution of the present utility model: The first-stage regenerator is filled with a regenerative material.

[0019] As a further solution of the present utility model: The cold finger assembly uses the first-stage cold finger assembly and the second-stage cold finger assembly simultaneously. The compressor can be connected to the first-stage cold finger assembly and the second-stage cold finger assembly respectively through the first-stage helium pipe and the second-stage helium pipe. Both the first-stage cold finger assembly and the second-stage cold finger assembly are connected to the corresponding active phase adjustment mechanism through the phase adjustment connecting pipe.

[0020] As a further solution of the present utility model: The active phase adjustment mechanism adopts a double-piston opposed active phase adjustment mechanism.

[0021] As a further solution of the present utility model: The second-stage cold finger assembly includes a second-stage regenerator hot end heat exchanger, a second-stage first-stage regenerator, a precooling heat exchanger, a second-stage second-stage regenerator, a second-stage regenerator cold end heat exchanger, a second-stage connecting pipe, a second-stage pulse tube cold end heat exchanger, a second-stage pulse tube, and a second-stage pulse tube hot end heat exchanger that are connected in sequence. The second-stage regenerator hot end heat exchanger is connected to the second-stage helium pipe, and the second-stage pulse tube hot end heat exchanger is connected to the phase adjustment connecting pipe.

[0022] Compared with the prior art, the beneficial effects of the present utility model are:

[0023] First of all, the active phase adjustment mechanism of the present application is a low-frequency active phase adjustment mechanism driven by a linear motor. Under the action of alternating current, an alternating magnetic field is formed to drive the phase adjustment piston to reciprocate. The phase, displacement, and operating frequency of the phase adjustment piston can be controlled by adjusting the alternating current parameters to achieve the active phase adjustment function; the size, weight of the phase adjustment piston, and the length and diameter of the phase adjustment connecting pipe are all adjustable. Through the matching adjustment of various parameters, the best phase angle between the pressure wave and the mass flow at the hot end of the pulse tube is obtained, thereby improving the efficiency and achieving high efficiency of the whole machine; it solves the problems of insufficient phase adjustment ability, complex structure, and low efficiency of traditional two-way intake and small-hole gas reservoirs.

[0024] By adopting the low-frequency active phase adjustment mechanism, the present application can recover the acoustic power at the hot end of the pulse tube while actively adjusting the phase, further improving the efficiency of the whole machine, thereby realizing a GM pulse tube refrigerator with high reliability and high refrigeration efficiency;

[0025] Secondly, the phase modulation mechanism of the present application can be a single-piston active phase modulation mechanism or a double-piston opposed active phase modulation mechanism; and the support method of the phase modulation piston is not limited, and it can be supported by an air bearing to reduce piston wear and improve the overall machine life; or it can be supported by a mechanical spring or other methods, thereby improving the flexibility of the present application. Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of a single-piston active phase modulation type GM pulse tube refrigerator according to Embodiment 1 of the present utility model;

[0027] Figure 2 It is a schematic structural diagram of a single-piston active phase modulation mechanism according to an embodiment of the present utility model;

[0028] Figure 3 It is a schematic structural diagram of an active phase modulation linear motor according to an embodiment of the present utility model;

[0029] Figure 4 It is a schematic structural diagram of a double-piston opposed active phase modulation mechanism according to Embodiment 2 of the present utility model;

[0030] Figure 5 It is a schematic structural diagram of an active phase modulation type two-stage GM pulse tube refrigerator according to Embodiment 3 of the present utility model;

[0031] Description of the Reference Numerals:

[0032] 1. Single-piston active phase modulation mechanism; 11. Active phase modulation linear motor; 1101. Inner stator; 1102. Outer stator; 1103. Coil; 1104. Permanent magnet; 12. Phase modulation piston; 13. Cylinder; 14. Skeleton; 15. Outer shell; 16. End cover;

[0033] 2. Double-piston opposed active phase modulation mechanism; 21. Opposed cylinder;

[0034] 4. First-stage cold finger assembly; 41. First-stage regenerator hot-end heat exchanger; 42. First-stage regenerator; 43. First-stage regenerator cold-end heat exchanger; 44. First-stage connecting pipe; 45. First-stage pulse tube cold-end heat exchanger; 46. First-stage pulse tube; 47. First-stage pulse tube hot-end heat exchanger;

[0035] 5. Second-stage cold finger assembly; 51. Second-stage regenerator hot-end heat exchanger; 52. First section of the second-stage regenerator; 53. Pre-cooling heat exchanger; 54. Second section of the second-stage regenerator; 55. Second-stage regenerator cold-end heat exchanger; 56. Second-stage connecting pipe; 57. Second-stage pulse tube cold-end heat exchanger; 58. Second-stage pulse tube; 59. Second-stage pulse tube hot-end heat exchanger;

[0036] 6. Compressor; 61. First-stage helium pipe; 62. Rotary valve; 63. Second-stage helium pipe;

[0037] 10. First-stage phase modulation connecting pipe;

[0038] 70. Secondary regulation connecting pipe. Specific implementation manner

[0039] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present utility model.

[0040] Embodiment 1

[0041] Referring to Figure 1 , an active phase modulation type GM pulse tube refrigerator includes a single piston active phase modulation mechanism 1, a first-stage cold finger assembly 4, a compressor 6, a first-stage helium pipe 61, a rotary valve 62 and a first-stage regulation connecting pipe 10. Among them, the compressor 6 is connected to the first-stage cold finger assembly 4 through the first-stage helium pipe 61. A rotary valve 62 is arranged on the first-stage helium pipe 61. The other end of the first-stage cold finger assembly 4 is connected to the single piston active phase modulation mechanism 1 through the first-stage regulation connecting pipe 10.

[0042] Referring to Figure 1 and Figure 2 , the single piston active phase modulation mechanism 1 includes an active phase modulation linear motor 11, a phase modulation piston 12, a cylinder 13, a framework 14, a housing 15 and an end cover 16. The housing 15 is in a "U"-shaped structure, and the end cover 16 is installed on its top. The active phase modulation linear motor 11, the phase modulation piston 12, the cylinder 13 and the framework 14 are integrated inside the housing 15. The phase modulation piston 12 is arranged at the middle position of the cylinder 13. The framework 14 is in an inverted "U"-shaped structure and is installed above the cylinder 13. The active phase modulation linear motor 11 is located outside the cylinder 13, and the framework 14 is inserted between the active phase modulation linear motor 11 and the cylinder 13. One end of the cylinder 13 in the single piston active phase modulation mechanism 1 is connected to the first-stage pulse tube hot end heat exchanger 47 of the first-stage cold finger assembly 4 through the first-stage regulation connecting pipe 10. The phase modulation piston 12 can be supported by a spring (such as a column spring or a plate spring), and can be mechanically connected radially, or can also be supported by an air bearing to reduce piston wear and improve the overall life of the machine.

[0043] Referring to Figure 2 and Figure 3, the active phase modulation linear motor 11 includes an inner stator 1101, an outer stator 1102, a coil 1103, and a permanent magnet 1104. The permanent magnet 1104 is bonded to the skeleton 14, and the skeleton 14 is fixedly connected to the top of the phase modulation piston 12. The inner stator 1101 is fixed on the outer circumference of the thin wall of the cylinder 13, and the outer stator 1102 is sleeved on the coil 1103 and then fixed on the flange end face of the cylinder 13. When in use, a low-frequency alternating current is input to the coil 1103 to form an alternating magnetic field. The permanent magnet 1104 drives the connected phase modulation piston 12 to perform an axial reciprocating motion under the action of the alternating magnetic field force. The phase modulation piston 12 reciprocates in the cylinder 13 to form a pressure wave, adjusting the phase angle between the mass flow at the hot end of the pulse tube and the pressure wave. By changing parameters such as the voltage, phase, and frequency of the linear motor, the phase, displacement, and operating frequency of the phase modulation piston 12 are controlled to obtain the best phase angle between the mass flow at the hot end of the pulse tube and the pressure wave, realizing the best active phase modulation function, and recovering the acoustic power at the hot end to improve the overall efficiency of the machine.

[0044] Refer to Figure 1 , the first-stage cold finger assembly 4 includes a first-stage regenerator hot end heat exchanger 41, a first-stage regenerator 42, a first-stage regenerator cold end heat exchanger 43, a first-stage connecting pipe 44, a first-stage pulse tube cold end heat exchanger 45, a first-stage pulse tube 46, and a first-stage pulse tube hot end heat exchanger 47 connected in sequence. Among them, the first-stage regenerator hot end heat exchanger 41 is connected to the first-stage helium pipe 61, and the first-stage pulse tube hot end heat exchanger 47 is connected to the first-stage phase modulation connecting pipe 10; the gas reciprocates between the components. The first-stage regenerator 42 is filled with a regenerative material. According to different refrigeration temperature ranges, regenerative materials such as stainless steel wire mesh, HoCu2, and Er3Ni are selected for filling. The gas expands and does work to refrigerate in the first-stage pulse tube 46.

[0045] The compressor 6 supplies gas and input work to the first-stage cold finger assembly 4. The input work forms a high-temperature and high-pressure gas, which is then cooled by the first-stage regenerator 42 in the first-stage cold finger assembly 4, expands and absorbs heat at the first-stage regenerator cold end heat exchanger 43, and absorbs external heat to achieve a refrigeration effect.

[0046] Embodiment 2

[0047] Refer to Figure 4, others are the same as above, the differences are as follows: the single-piston active phase modulation mechanism 1 in Embodiment 1 is changed to a double-piston opposed active phase modulation mechanism 2, the cylinder 13 in the single-piston active phase modulation mechanism 1 is replaced by an opposed cylinder 21, and the active phase modulation linear motor 11, the phase modulation piston 12, and the skeleton 14 are symmetrically arranged and installed on both sides of the opposed cylinder 21, forming a compression chamber and two back pressure chambers. A compression chamber is formed between the two phase modulation pistons 12, and a back pressure chamber is formed between the two skeletons 14 and the end cover 16. At the same time, the outer shell 15 is in a format with openings at both left and right ends, and the end cover 16 fixes both ends. The working principle of the double-piston opposed active phase modulation mechanism 2 is the same as that of the single-piston active phase modulation mechanism 1, the difference being that it can drive two groups of phase modulation pistons 12 to work simultaneously; by inputting the same low-frequency alternating current to the active phase modulation linear motors 11 on both sides, the opposed phase modulation pistons 12 on both sides perform low-frequency synchronous reciprocating movements in opposite directions under the action of the alternating current, realizing active phase modulation and recovering acoustic power while reducing vibration.

[0048] Embodiment 3

[0049] Refer to Figure 5 , this example is an active phase modulation type two-stage GM pulse tube refrigerator, that is, on the basis of Embodiment 2, two sets of double-piston opposed active phase modulation mechanisms 2 are provided, and a secondary cold finger assembly 5 is added;

[0050] The active phase modulation type two-stage GM pulse tube refrigerator includes a compressor 6, a rotary valve 62, a primary helium tube 61, a secondary helium tube 63, a primary cold finger assembly 4, a secondary cold finger assembly 5, and two sets of double-piston opposed active phase modulation mechanisms 2. The structure of the primary cold finger assembly 4 is the same as that in Embodiment 1, and will not be elaborated in this embodiment; the secondary cold finger assembly 5 includes a secondary regenerator hot end heat exchanger 51, a secondary first-stage regenerator 52, a precooling heat exchanger 53, a secondary second-stage regenerator 54, a secondary regenerator cold end heat exchanger 55, a secondary connecting pipe 56, a secondary pulse tube cold end heat exchanger 57, a secondary pulse tube 58, and a secondary pulse tube hot end heat exchanger 59. The secondary regenerator hot end heat exchanger 51 is connected to the secondary helium tube 63, and the secondary pulse tube hot end heat exchanger 59 is connected to the secondary phase modulation connecting pipe 70. It should be noted that the precooling heat exchanger 53 is connected to the primary regenerator cold end heat exchanger 43, and the secondary pulse tube hot end heat exchanger 59 is connected to the primary pulse tube cold end heat exchanger 45 for precooling to make the secondary refrigeration temperature lower.

[0051] Refer to Figure 5, the primary cold finger assembly 4 is connected to one set of double piston opposed active phase modulation mechanisms 2 through the primary phase modulation connecting pipe 10. The other set of double piston opposed active phase modulation mechanisms 2 is connected to the secondary cold finger assembly 5 through the secondary phase modulation connecting pipe 70. And the double piston opposed active phase modulation mechanism 2 connected to the secondary phase modulation connecting pipe 70 has a small gas volume, and the required size of the phase modulation mechanism is reduced compared to the size of the other set of double piston opposed active phase modulation mechanisms 2. By inputting alternating current to the two-stage phase modulation mechanisms respectively, according to the adjustment requirements of the two stages, the phases, displacements and operating frequencies of the two sets of phase modulation pistons 12 are adjusted respectively, so as to obtain the best phase angles of the hot-end mass flow and pressure wave of the two-stage pulse tubes respectively, realize the best two-stage phase modulation function, and recover the acoustic power at the hot ends of the two stages. The phase modulation pistons can be supported by air bearings or mechanical support methods.

[0052] Embodiment 4

[0053] Other aspects are the same as those in Embodiment 3, the only difference being that the double piston opposed active phase modulation mechanism 2 is replaced by a single piston active phase modulation mechanism 1 (not shown in the figure). The structure of the single piston active phase modulation mechanism 1 is the same as that in Embodiment 1, which will not be elaborated in this embodiment. In this embodiment, the phase modulation piston 12 can be supported by an air bearing or a mechanical support method.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some 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 invention.

Claims

1. An active phase-modulated GM pulse tube refrigerator, characterized in that: It comprises an active phase adjustment mechanism, a cold finger assembly, a compressor (6) and a phase adjustment connecting pipe, wherein the active phase adjustment mechanism is connected to the cold finger assembly via the phase adjustment connecting pipe, and the cold finger assembly is connected to the compressor (6) via a helium pipe, wherein a rotary valve (62) is also provided on the helium pipe; The active phase adjustment mechanism comprises a phase adjustment piston (12), the upper part of the phase adjustment piston (12) is connected to a frame (14), an active phase adjustment linear motor (11) is arranged on the outer side of the frame (14), a cylinder (13) is arranged on the outer side of the phase adjustment piston (12), and the active phase adjustment linear motor (11) is arranged on the cylinder (13); The active phase-adjusting linear motor (11) drives the phase-adjusting piston (12) to perform axial reciprocating motion, wherein the phase-adjusting piston (12) can reciprocate in the cylinder (13) to form a pressure wave.

2. The active phase-modulated GM pulse tube refrigerator according to claim 1, characterized in that: The active phase adjustment mechanism comprises a single-piston active phase adjustment mechanism (1) and a double-piston opposed active phase adjustment mechanism (2); In the single-piston active phase-adjusting mechanism (1), the phase-adjusting assembly formed by the active phase-adjusting linear motor (11), the phase-adjusting piston (12), the cylinder (13) and the frame (14) is installed in a housing (15) of the single-piston active phase-adjusting mechanism; In the dual-piston opposed active phase-adjusting mechanism (2), the cylinder (13) is replaced with an opposed cylinder (21), and a phase-adjusting assembly formed by an active phase-adjusting linear motor (11), a phase-adjusting piston (12), and a skeleton (14) is symmetrically installed in a housing (15) of the dual-piston opposed active phase-adjusting mechanism.

3. The active phase-modulated GM pulse tube refrigerator according to claim 2, characterized in that: In the dual-piston opposed active phase adjustment mechanism (2), a compression chamber is formed between the two groups of phase adjustment components, and a back pressure chamber is formed between the outer ends of the two groups of phase adjustment components and the outer shell (15).

4. The active phase-modulated GM pulse tube refrigerator according to claim 1, characterized in that: The active phase-modulating linear motor (11) comprises an inner stator (1101), an outer stator (1102), a coil (1103) and a magnetic steel (1104); the magnetic steel (1104) is bonded to a frame (14); the inner stator (1101) is fixed to the thin-walled outer circle of a cylinder (13); the outer stator (1102) is sleeved on the coil (1103) and fixed to the flange end face of the cylinder (13).

5. The active phase-modulated GM pulse tube refrigerator according to claim 4, characterized in that: Low-frequency alternating current is input into the coil (1103) to form an alternating magnetic field; the magnetic steel (1104) can drive the connected phase-adjusting piston (12) to perform axial reciprocating motion under the action of the alternating magnetic field force.

6. The active phase modulation type GM pulse tube refrigerator according to claim 1, characterized in that: The cold finger assembly adopts a first-level cold finger assembly (4), and the first-level cold finger assembly (4) includes a first-level regenerator hot-end heat exchanger (41), a first-level regenerator (42), a first-level regenerator cold-end heat exchanger (43), a first-level connecting pipe (44), a first-level pulse tube cold-end heat exchanger (45), a first-level pulse tube (46) and a first-level pulse tube hot-end heat exchanger (47) which are connected in sequence. The first-level regenerator hot-end heat exchanger (41) is connected to a first-level helium tube (61), and the first-level pulse tube hot-end heat exchanger (47) is connected to a conditioning connecting pipe.

7. The active phase modulation type GM pulse tube refrigerator according to claim 6, characterized in that: The first-stage regenerator (42) is filled with cold storage material.

8. The active phase modulation type GM pulse tube refrigerator according to claim 2, characterized in that: The cold finger assembly adopts a primary cold finger assembly (4) and a secondary cold finger assembly (5) for simultaneous use; the compressor (6) can be connected to the primary cold finger assembly (4) and the secondary cold finger assembly (5) respectively through a primary helium tube (61) and a secondary helium tube (63); the primary cold finger assembly (4) and the secondary cold finger assembly (5) are both connected to corresponding active phase adjustment mechanisms through phase adjustment connecting pipes.

9. The active phase-modulated GM pulse tube refrigerator according to claim 8, characterized in that: The active phase adjustment mechanism adopts a dual-piston opposed active phase adjustment mechanism (2).

10. The active phase-modulated GM pulse tube refrigerator according to claim 9, characterized in that: The secondary cold finger assembly (5) comprises a secondary regenerator hot end heat exchanger (51), a secondary first stage regenerator (52), a precooling heat exchanger (53), a secondary second stage regenerator (54), a secondary regenerator cold end heat exchanger (55), a secondary connecting pipe (56), a secondary pulse tube cold end heat exchanger (57), a secondary pulse tube (58) and a secondary pulse tube hot end heat exchanger (59) which are connected in sequence. The secondary regenerator hot end heat exchanger (51) is connected to a secondary helium tube (63), and the secondary pulse tube hot end heat exchanger (59) is connected to a conditioning connecting pipe.

Images