An integrated pulse tube refrigerator

Abstract

The present invention discloses an integrated pulse tube refrigerator, which relates to the technical field of pulse tube refrigerators. The refrigerator comprises a cold finger, a piston-type phase-adjusting mechanism, two main drive mechanisms, and a gas connection mechanism. By arranging the two main drive mechanisms and the piston-type phase-adjusting mechanism coaxially, with the cold finger arranged perpendicularly thereto, the entire device is simple and compact, with minimal loss in the connecting pipes. This achieves the goals of refrigerator integration, compactness, and high efficiency, and facilitates coupling with cooled devices. Furthermore, the use of the piston-type phase-adjusting mechanism for phase adjustment offers a wide phase adjustment range, a compact structure, and precise phase adjustment angles, contributing to high efficiency of the pulse tube refrigerator.

Description

Technical Field

[0001] The present invention relates to the technical field of pulse tube refrigerators, and in particular to an integrated pulse tube refrigerator. Background Art

[0002] The pulse tube refrigerator (PTC) is a key component of the regenerative small cryogenic refrigerator market. It primarily consists of a cold finger, a main drive mechanism, and a phase-shifting mechanism. The phase-shifting mechanism adjusts the phase relationship between the mass flow and pressure wave of the working fluid within the PTC. Phase-shifting mechanisms include orifice-gas reservoir type, bidirectional air intake type, inertia tube type, and piston type. Piston-type phase-shifting mechanisms are widely used due to their wide phase-shifting range and precise phase-shifting angle. Depending on the drive method, piston-type phase-shifting mechanisms are categorized as active piston phase-shifting and pneumatic piston phase-shifting.

[0003] A common problem with existing pulse tube refrigerators is that the main drive mechanism, cold finger, and phase adjustment mechanism are often arranged independently. Examples include patents CN113074468A - A Single-Piston Phase-Adjusted Pulse Tube Refrigerator System and Vibration Reduction Method Thereof, and CN215373024U - A Coaxial Active Phase-Adjusted Power Recovery Pulse Tube Refrigerator. This independent arrangement results in a complex structure, cumbersome installation, and significant losses in the connecting piping. This makes it difficult to apply to engineering applications that require compactness and high power consumption. The goal of cryogenic refrigerator innovation is to create new structures that achieve refrigerator integration, compactness, and high efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide an integrated pulse tube refrigerator to solve the problems existing in the above-mentioned prior art. The overall structure of the refrigerator is simple, the loss of the connecting pipes is small, and the goals of integration, compactness and high efficiency of the refrigerator are achieved.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides an integrated pulse tube refrigerator, comprising a refrigerator cold finger, a piston-type phase-shifting mechanism, two main drive mechanisms and an air path connecting mechanism; the refrigerator cold finger comprises a pulse tube, a cold accumulator, a cold-end heat exchanger and a hot-end heat exchanger, the inner wall of the cold accumulator and the outer wall of the pulse tube are coaxially arranged, the cold-end heat exchanger is connected to the cold end of the pulse tube and the cold end of the cold accumulator for heat exchange, and the hot-end heat exchanger is connected to the hot end of the pulse tube and the hot end of the cold accumulator for heat exchange; the piston-type phase-shifting mechanism comprises a phase-shifting cylinder body, two phase-shifting piston bodies and two first elastic supporting members capable of respectively resetting the phase-shifting piston bodies, a first sliding channel is provided in the phase-shifting cylinder body, the two phase-shifting piston bodies are symmetrically and slidably arranged in the first sliding channel, the two phase-shifting piston bodies divide the first sliding channel into a phase-shifting cavity and two recovery cavities located at both ends of the phase-shifting cavity, and the first sliding channel located between the two phase-shifting piston bodies forms the phase-shifting cavity; The main drive mechanism includes a main drive cylinder body, a main drive piston body and a main drive component. A second sliding channel is provided in the main drive cylinder body. The main drive component is used to drive the main drive piston body to reciprocate in the second sliding channel. The main drive piston body divides the second sliding channel into a compression chamber and a back pressure chamber. The air path connecting mechanism includes a phase-adjusting pipeline and two air intake pipelines. The two main drive mechanisms are symmetrically arranged at both ends of the piston-type phase-adjusting mechanism. The cold fingers of the refrigerator are arranged on the piston-type phase-adjusting mechanism at the symmetrical center position of the two main drive mechanisms. The axis of the first sliding channel is coaxial with the axes of the two second sliding channels. The axis of the pulse tube is perpendicular to the axis of the first sliding channel. The compression chamber of each main drive mechanism is respectively connected to the recovery chamber on the same side. The phase-adjusting chamber is connected to the hot end of the pulse tube through the phase-adjusting pipeline. Each compression chamber is connected to the hot end heat exchanger through one of the air intake pipelines.

[0007] Preferably, a first vibration damping mechanism is fixedly provided on the piston-type phase adjustment mechanism. The first vibration damping mechanism is arranged opposite to the cold finger of the refrigerator, and the axis of the first vibration damping mechanism is coaxial with the axis of the pulse tube of the cold finger of the refrigerator.

[0008] Preferably, a second vibration damping mechanism is further fixedly provided on the piston-type phase adjustment mechanism, and the axis of the second vibration damping mechanism is perpendicular to the axis of the pulse tube and the axis of the first sliding channel.

[0009] Preferably, a sliding shaft is fixedly provided on the side of the phase-adjusting piston body close to the main drive mechanism, a sliding through hole is opened in the main drive piston body, the sliding shaft is sealed and slides through the sliding through hole, and the end of the sliding shaft away from the phase-adjusting piston body is connected to the first elastic support member.

[0010] Preferably, a second elastic supporting member is provided at one end of the main driving piston body away from the phase-adjusting cavity, and the second elastic supporting member can reset the main driving piston body.

[0011] Preferably, the first elastic supporting member is a phase-adjusting leaf spring connected to the sliding shaft.

[0012] Preferably, the second elastic supporting member is a double-leaf main driving leaf spring fixedly connected to one end of the main driving piston body away from the phase-adjusting cavity.

[0013] Preferably, the first vibration damping mechanism includes a first balancing mass block, a first connecting rod and a first vibration damping support member, the first connecting rod is fixedly connected to the piston-type phase adjustment mechanism, the first balancing mass block is connected to both sides of the first connecting rod through the first vibration damping support member, and the axis of the first connecting rod is coaxial with the axis of the pulse tube.

[0014] Preferably, the first vibration damping mechanism includes a second balancing mass block, a second connecting rod, a vibration damping piston, a vibration damping drive mechanism and a second vibration damping support member, the vibration damping piston is located in the vibration damping drive mechanism, the vibration damping drive mechanism is fixedly connected to one end of the second connecting rod, the other end of the second connecting rod is fixedly connected to the piston phasing mechanism, the second balancing mass block is arranged on the vibration damping piston, the second vibration damping support member is fixedly arranged on the end of the vibration damping piston away from the second connecting rod, the second vibration damping support member can support and reset the vibration damping piston, the vibration damping drive mechanism is used to drive the vibration damping piston to reciprocate along its axis, and the axis of the vibration damping piston is coaxial with the axis of the pulse tube.

[0015] Preferably, the second vibration-damping support member is a double-leaf vibration-damping leaf spring fixedly connected to the vibration-damping piston.

[0016] Compared with the prior art, the present invention has achieved the following technical effects:

[0017] The integrated pulse tube refrigerant provided by the present invention arranges two main drive mechanisms and a piston-type phase-adjusting mechanism coaxially, and the cold fingers of the refrigerator are arranged perpendicular to them. The whole machine is simple and compact, and the loss of the connecting pipelines is small, thereby achieving the goals of integration, compactness and high efficiency of the refrigerator, and facilitating coupling and application with the cooled device; and the piston-type phase-adjusting mechanism is used for phase adjustment, which has a wide phase adjustment range, a compact structure, and a precise phase adjustment angle, which is conducive to achieving high efficiency of the pulse tube refrigerator.

[0018] Furthermore, a first vibration reduction mechanism and a second vibration reduction mechanism are added. The combined motion phase of the first vibration reduction mechanism and the second vibration reduction mechanism is opposite to the combined motion phase of the two main drive mechanisms and the piston-type phase adjustment mechanism, so as to reduce the vibration output of the cold finger of the refrigerator, so that it can be applied to sensitive devices such as infrared detectors to ensure the normal operation of the sensitive devices; and the first vibration reduction mechanism and the second vibration reduction mechanism form a vibration suppression similar to that in the X and Y directions, and the vibration suppression in the Z axis can also be achieved by adjusting the different operating conditions of the two main drive mechanisms. Finally, the vibration suppression in the three directions is combined to achieve the maximum reduction of the vibration of the cold finger of the refrigerator.

[0019] Furthermore, both the main driving mechanism and the piston-type phase adjustment mechanism utilize leaf springs to provide restoring force, which makes the restoring force more stable, the reliability of the entire system higher, and the adjustment of the restoring force more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the overall structure of the integrated pulse tube refrigerator provided by the present invention;

[0022] Figure 2 A schematic diagram of the installation positions of the first vibration damping mechanism and the second vibration damping mechanism in the integrated pulse tube refrigerator provided by the present invention;

[0023] Figure 3 A schematic diagram of the structure of the cold finger of the refrigerator in the integrated pulse tube refrigerator provided by the present invention;

[0024] Figure 4 This is a schematic structural diagram of the piston-type phase adjustment mechanism in the integrated pulse tube refrigerator provided by the present invention;

[0025] Figure 5 A schematic structural diagram of the main drive mechanism in the integrated pulse tube refrigerator provided by the present invention;

[0026] Figure 6 This is a schematic structural diagram of the first vibration reduction mechanism in the integrated pulse tube refrigerator provided by the present invention as active vibration reduction.

[0027] In the figure: 100 - integrated pulse tube refrigerator;

[0028] 10-refrigeration machine cold finger; 11-pulse tube; 12-cold storage device; 13-cold end heat exchanger; 14-hot end heat exchanger;

[0029] 20-piston type phase adjustment mechanism; 21-phase adjustment cylinder body; 22-phase adjustment piston body; 221-sliding shaft; 23-phase adjustment leaf spring; 231-phase adjustment leaf spring seat; 24-first sliding channel; 25-phase adjustment cavity;

[0030] 30 - Main drive mechanism; 31 - Main drive cylinder; 32 - Main drive piston; 321 - Sliding through hole; 33 - Main drive leaf spring; 331 - Main drive leaf spring seat; 34 - Second sliding channel; 35 - Compression chamber; 36 - Main drive member; 361 - Outer yoke; 362 - Magnet; 363 - Coil; 364 - Inner yoke; 37 - Refrigerator housing; 38 - Back pressure chamber;

[0031] 40-gas path connecting mechanism; 41-phase adjustment pipeline; 42-air intake pipeline;

[0032] 50 - first vibration damping mechanism; 51 - second balancing mass block; 52 - second connecting rod; 53 - vibration damping piston; 54 - vibration damping drive mechanism; 55 - vibration damping leaf spring; 551 - vibration damping leaf spring seat;

[0033] 60-Second vibration reduction mechanism. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] The purpose of the present invention is to provide an integrated pulse tube refrigerator to solve the problems existing in the prior art. The whole machine has a simple structure and low loss in the connecting pipes, thereby achieving the goals of integration, compactness and high efficiency of the refrigerator.

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Example 1

[0038] This embodiment provides an integrated pulse tube refrigerator 100. Figures 1 to 6 As shown, it includes a refrigerator cold finger 10, a piston-type phase adjustment mechanism 20, two main drive mechanisms 30 and an air path connection mechanism 40;

[0039] The cold finger 10 of the refrigerator includes a pulse tube 11, a cold accumulator 12, a cold end heat exchanger 13, and a hot end heat exchanger 14. The inner wall of the cold accumulator 12 and the outer wall of the pulse tube 11 are coaxially arranged. The cold end heat exchanger 13 is connected to the cold end of the pulse tube 11 and the cold end of the cold accumulator 12 for heat exchange, and the hot end heat exchanger 14 is connected to the hot end of the pulse tube 11 and the hot end of the cold accumulator 12 for heat exchange.

[0040] Specifically, the cold-end heat exchanger 13 , the hot-end heat exchanger 14 , the cold storage device 12 and the pulse tube 11 are all coaxially arranged.

[0041] The piston-type phase-shifting mechanism 20 includes a phase-shifting cylinder 21, two phase-shifting piston bodies 22, and two first elastic support members capable of resetting the phase-shifting piston bodies 22. A first sliding channel 24 is provided in the phase-shifting cylinder 21. The two phase-shifting piston bodies 22 are symmetrically and slidably disposed in the first sliding channel 24. The two phase-shifting piston bodies 22 divide the first sliding channel 24 into a phase-shifting cavity 25 and two recovery cavities located at both ends of the phase-shifting cavity 25. The first sliding channel 24 located between the two phase-shifting piston bodies 22 forms the phase-shifting cavity 25.

[0042] The main drive mechanism 30 includes a main drive cylinder 31, a main drive piston 32, and a main drive member 36. A second sliding channel 34 is defined within the main drive cylinder 31. The main drive member 36 is configured to drive the main drive piston 32 to reciprocate within the second sliding channel 34. The main drive piston 32 divides the second sliding channel 34 into a compression chamber 35 and a back-pressure chamber 38.

[0043] The gas path connecting mechanism 40 includes a phase adjustment pipeline 41 and two air intake pipelines 42;

[0044] The two main driving mechanisms 30 are symmetrically arranged at both ends of the piston-type phase-adjusting mechanism 20. The cold finger 10 of the refrigerator is arranged on the piston-type phase-adjusting mechanism 20 at a symmetrical center position of the two main driving mechanisms 30. The axis of the first sliding channel 24 is coaxial with the axis of the two second sliding channels 34. The axis of the pulse tube 11 is perpendicular to the axis of the first sliding channel 24. The compression chamber 35 of each main driving mechanism 30 is respectively connected to the recovery chamber on the same side. The phase-adjusting chamber 25 is connected to the hot end of the pulse tube 11 through the phase-adjusting pipeline 41. Each compression chamber 35 is connected to the hot end heat exchanger 14 through an air intake pipeline 42.

[0045] By arranging the two main drive mechanisms 30 and the piston-type phase adjustment mechanism 20 coaxially and arranging the refrigerator cold finger 10 perpendicularly thereto, the entire machine is simple and compact, and the loss in the connecting pipeline is small, thereby achieving the goals of integration, compactness and high efficiency of the refrigerator, and facilitating coupling application with the cooled device; and the use of the piston-type phase adjustment mechanism 20 for phase adjustment has a wide phase adjustment range, a compact structure, and a precise phase adjustment angle, which is conducive to achieving high efficiency of the pulse tube refrigerator.

[0046] Specifically, the filler of the cold storage device 12 can be stainless steel wire mesh, holmium copper, Er3Ni, etc.; the cold end heat exchanger 13 and the hot end heat exchanger 14 can be slit type, wire mesh type, fin type, tube bundle type, etc.

[0047] Specifically, the phase-adjusting cavity 25 is connected to the hot end of the pulse tube 11 through the phase-adjusting pipeline 41 to adjust the phase difference between the mass flow of the working medium and the pressure wave.

[0048] Specifically, a refrigerator housing 37 is further provided on the outside of the main driving mechanism 30 .

[0049] Specifically, the mass flow of the working fluid enters the cold finger 10 of the refrigerator from the compression chamber 35 of the main driving mechanism 30 through the gas path connecting mechanism 40, and then enters the piston-type phase adjustment mechanism 20 through the gas path connecting mechanism 40 to adjust the phase angle between the working fluid mass flow and the pressure wave.

[0050] Specifically, the phase adjustment piston body 22 and the main driving piston body 32 are both of the air-floating type.

[0051] Specifically, the main driving component 36 includes an outer magnetic yoke 361, a magnet 362, a coil 363 and an inner magnetic yoke 364. The main driving component 36 is an existing structure, and its structural composition is the same as that of the existing structure, which will not be repeated here.

[0052] Among the optional solutions of this embodiment, it is more preferred that Figure 1 and Figure 4 As shown, a sliding shaft 221 is fixedly provided on the side of the phase-adjusting piston body 22 close to the main drive mechanism 30, and a sliding through hole 321 is opened in the main drive piston body 32. The sliding shaft 221 is sealed and slides through the sliding through hole 321. The end of the sliding shaft 221 away from the phase-adjusting piston body 22 is connected to the first elastic support member.

[0053] Among the optional solutions of this embodiment, it is more preferred that Figure 1 and Figure 4 As shown, the first elastic supporting member is a phase-adjusting leaf spring 23 connected to the sliding shaft 221 .

[0054] Specifically, it also includes a phase-adjusting leaf spring seat 231 , on which the phase-adjusting leaf spring 23 is mounted, and the phase-adjusting leaf spring seat 231 is fixedly disposed in the main driving mechanism 30 .

[0055] Among the optional solutions of this embodiment, it is more preferred that Figure 1 and Figure 5 As shown, a second elastic supporting member is provided at one end of the main driving piston body 32 away from the phase-adjusting cavity 25 , and the second elastic supporting member can reset the main driving piston body 32 .

[0056] Among the optional solutions of this embodiment, it is more preferred that Figure 1and Figure 5 As shown, the second elastic support member is a double-piece main driving leaf spring 33 fixedly connected to the end of the main driving piston body 32 away from the phase adjustment cavity 25.

[0057] Specifically, it further includes a main driving leaf spring seat 331 , on which the main driving leaf spring 33 is mounted, and the main driving leaf spring seat 331 is fixedly disposed on the main driving mechanism 30 .

[0058] Among the optional solutions of this embodiment, it is more preferred that Figure 1 and Figure 2 As shown, a first vibration damping mechanism 50 is fixedly provided on the piston-type phase adjustment mechanism 20 . The first vibration damping mechanism 50 is arranged opposite to the refrigerator cold finger 10 , and the axis of the first vibration damping mechanism 50 is coaxial with the axis of the pulse tube 11 of the refrigerator cold finger 10 .

[0059] Among the optional solutions of this embodiment, it is more preferred that Figure 2 As shown, a second vibration damping mechanism 60 is fixedly provided on the piston-type phase adjustment mechanism 20 , and the axis of the second vibration damping mechanism 60 is perpendicular to the axis of the pulse tube 11 and the axis of the first sliding channel 24 .

[0060] That is Figure 1 As shown in FIG. 1 , a first vibration reduction mechanism 50 and a second vibration reduction mechanism 60 are installed on the lower part and the back part of the piston-type phase adjustment mechanism 20 , respectively.

[0061] A first vibration damping mechanism 50 and a second vibration damping mechanism 60 are additionally provided. The combined motion phase of the first vibration damping mechanism 50 and the second vibration damping mechanism 60 is opposite to the combined motion phase of the two main drive mechanisms 30 and the piston-type phase adjustment mechanism 20, so as to reduce the vibration output of the refrigerator cold finger 10, so that it can be applied to sensitive devices such as infrared detectors to ensure the normal operation of the sensitive devices. The first vibration damping mechanism 50 and the second vibration damping mechanism 60 form vibration suppression on the X-axis and the Y-axis, and the vibration suppression on the Z-axis can also be achieved by adjusting the different operating conditions of the two main drive mechanisms 30. Finally, the vibration suppression in the three directions is combined to achieve the maximum reduction of vibration of the refrigerator cold finger 10.

[0062] Specifically, the first vibration reduction mechanism 50 and the second vibration reduction mechanism 60 may be active vibration reduction or passive vibration reduction.

[0063] When it is passive vibration reduction, taking the first vibration reduction mechanism 50 as an example, the first vibration reduction mechanism 50 includes a first balancing mass block, a first connecting rod and a first vibration reduction support member. The first connecting rod is fixedly connected to the piston-type phase adjustment mechanism 20, and the first balancing mass block is connected to both sides of the first connecting rod through the first vibration reduction support member. The axis of the first connecting rod is coaxial with the axis of the pulse tube 11.

[0064] When it is active vibration reduction, take the first vibration reduction mechanism 50 as an example. Figure 1 and Figure 6 As shown, the first vibration damping mechanism 50 includes a second balancing mass block 51, a second connecting rod 52, a vibration damping piston 53, a vibration damping drive mechanism 54 and a second vibration damping support member. The vibration damping piston 53 is located in the vibration damping drive mechanism 54. The vibration damping drive mechanism 54 is fixedly connected to one end of the second connecting rod 52, and the other end of the second connecting rod 52 is fixedly connected to the piston phasing mechanism. The second balancing mass block 51 is arranged on the vibration damping piston 53, and the second vibration damping support member is fixedly arranged on the end of the vibration damping piston 53 away from the second connecting rod 52. The second vibration damping support member can support and reset the vibration damping piston 53. The vibration damping drive mechanism 54 is used to drive the vibration damping piston 53 to reciprocate along its axis. The axis of the vibration damping piston 53 is coaxial with the axis of the pulse tube 11.

[0065] Specifically, the first balancing mass block and the second balancing mass block 51 can be matched and arranged on the corresponding first connecting rod and the damping piston 53, and the mass can be adjusted to play the role of counterweight.

[0066] Specifically, the first vibration damping mechanism 50 and the second vibration damping mechanism 60 have the same structure, and their vibration damping drive mechanisms 54 can be mechanisms such as linear motors or thermoacoustic machines that drive the corresponding vibration damping pistons 53 to reciprocate. When the vibration damping drive mechanisms 54 of the first vibration damping mechanism 50 and the second vibration damping mechanism 60 are both linear motors, the combined motion phases of the corresponding vibration damping pistons 53 on the first vibration damping mechanism 50 and the second vibration damping mechanism 60 in the X and Y directions can be opposite to the combined motion phases of the main driving piston bodies 32 of the two main driving mechanisms 30 and the phase adjustment piston body 22 of the piston-type phase adjustment mechanism 20 in the X and Y directions, so as to reduce the vibration output of the cold finger 10 of the refrigerator.

[0067] Among the optional solutions of this embodiment, it is more preferred that Figure 1 and Figure 6 As shown, the second vibration-damping support member is a double-leaf vibration-damping leaf spring 55 fixedly connected to the vibration-damping piston 53 .

[0068] Specifically, the second vibration-damping support member further includes a vibration-damping leaf spring seat 551 . The vibration-damping leaf spring 55 is mounted on the vibration-damping leaf spring seat 551 . The vibration-damping leaf spring seat 551 is fixedly disposed on the vibration-damping drive mechanism 54 .

[0069] Both the main driving mechanism 30 and the piston-type phase adjustment mechanism 20 utilize leaf springs to provide restoring force, which provides a more stable restoring force, improves the reliability of the entire system, and makes adjustment of the restoring force more convenient.

[0070] Specifically, the leaf springs used in the present device, including the main driving leaf spring 33 , the phase-adjusting leaf spring 23 and the vibration-damping leaf spring 55 , can provide both a supporting force and a restoring force for resetting corresponding components.

[0071] The structural features of the coaxial refrigerator cold finger 10, the phase-adjusting piston, the leaf spring supports, and the first and second vibration mechanisms are fully utilized to achieve the integration, compactness, and high efficiency of the overall system, which is of great significance to the practical application of micro pulse tube refrigerators in aerospace, tactical equipment and other fields.

[0072] Working principle:

[0073] Driven by the main drive component 36, the main drive piston body 32 will continuously reciprocate in the second sliding channel 34, causing the compression chamber 35 to be alternately compressed and expanded, and the working medium will continuously alternately enter and be drawn out of the cold storage device 12 through the air intake pipe 42. The working medium entering the cold storage device 12 will continuously alternately enter and be drawn out of the pulse tube 11, and then the working medium will continuously alternately enter and be drawn out of the phase adjustment chamber 25 through the phase adjustment pipe 41, and cooperate with the phase adjustment leaf spring 23 to make the phase adjustment piston body 22 continuously reciprocate in the first sliding channel 24, thereby realizing the adjustment of the phase relationship between the mass flow of the working medium and the pressure wave, and the cold and heat are respectively drawn out through the cold end heat exchanger 13 and the hot end heat exchanger 14.

[0074] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. An integrated pulse tube refrigerator, characterized in that: It includes a refrigerator cold finger, a piston-type phase adjustment mechanism, two main drive mechanisms and a gas path connection mechanism; The cold finger of the refrigerator includes a pulse tube, a cold accumulator, a cold end heat exchanger and a hot end heat exchanger. The inner wall of the cold accumulator and the outer wall of the pulse tube are coaxially arranged. The cold end heat exchanger is connected to the cold end of the pulse tube and the cold end of the cold accumulator for heat exchange, and the hot end heat exchanger is connected to the hot end of the pulse tube and the hot end of the cold accumulator for heat exchange. The piston-type phase-shifting mechanism includes a phase-shifting cylinder body, two phase-shifting piston bodies, and two first elastic support members capable of respectively resetting the phase-shifting piston bodies. A first sliding channel is provided in the phase-shifting cylinder body. The two phase-shifting piston bodies are symmetrically and slidably arranged in the first sliding channel. The two phase-shifting piston bodies divide the first sliding channel into a phase-shifting cavity and two recovery cavities located at both ends of the phase-shifting cavity. The first sliding channel located between the two phase-shifting piston bodies forms the phase-shifting cavity. The main drive mechanism includes a main drive cylinder body, a main drive piston body and a main drive component. A second sliding channel is provided in the main drive cylinder body. The main drive component is used to drive the main drive piston body to reciprocate in the second sliding channel. The main drive piston body divides the second sliding channel into a compression chamber and a back pressure chamber. The gas path connecting mechanism includes a phase adjustment pipeline and two air intake pipelines; The two main driving mechanisms are symmetrically arranged at both ends of the piston-type phase-adjusting mechanism, and the cold fingers of the refrigerator are arranged on the piston-type phase-adjusting mechanism at the symmetrical center position of the two main driving mechanisms. The axis of the first sliding channel is coaxial with the axis of the two second sliding channels, and the axis of the pulse tube is perpendicular to the axis of the first sliding channel. The compression chamber of each main driving mechanism is respectively connected to the recovery chamber on the same side, and the phase-adjusting chamber is connected to the hot end of the pulse tube through the phase-adjusting pipeline. Each compression chamber is connected to the hot end heat exchanger through an intake pipeline.

2. The integrated pulse tube refrigerator according to claim 1, wherein: A first vibration damping mechanism is also fixedly provided on the piston-type phase adjustment mechanism. The first vibration damping mechanism is arranged opposite to the cold finger of the refrigerator, and the axis of the first vibration damping mechanism is coaxial with the axis of the pulse tube of the cold finger of the refrigerator.

3. The integrated pulse tube refrigerator according to claim 2, wherein: A second vibration damping mechanism is also fixedly provided on the piston-type phase adjustment mechanism, and the axis of the second vibration damping mechanism is perpendicular to the axis of the pulse tube and the axis of the first sliding channel.

4. The integrated pulse tube refrigerator according to claim 1, wherein: A sliding shaft is fixedly provided on the side of the phase-adjusting piston body close to the main driving mechanism, a sliding through hole is opened in the main driving piston body, the sliding shaft is sealed and slides through the sliding through hole, and the end of the sliding shaft away from the phase-adjusting piston body is connected to the first elastic supporting member.

5. The integrated pulse tube refrigerator according to claim 1, wherein: A second elastic supporting member is provided at one end of the main driving piston body away from the phase-adjusting cavity, and the second elastic supporting member can reset the main driving piston body.

6. The integrated pulse tube refrigerator according to claim 4, wherein: The first elastic supporting member is a phase-adjusting leaf spring connected to the sliding shaft.

7. The integrated pulse tube refrigerator according to claim 5, wherein: The second elastic supporting member is a double-piece main driving leaf spring fixedly connected to one end of the main driving piston body away from the phase-adjusting cavity.

8. The integrated pulse tube refrigerator according to claim 2, wherein: The first vibration damping mechanism includes a first balancing mass block, a first connecting rod and a first vibration damping support member. The first connecting rod is fixedly connected to the piston-type phase adjustment mechanism. The first balancing mass block is connected to both sides of the first connecting rod through the first vibration damping support member. The axis of the first connecting rod is coaxial with the axis of the pulse tube.

9. The integrated pulse tube refrigerator according to claim 2, wherein: The first vibration damping mechanism includes a second balancing mass block, a second connecting rod, a vibration damping piston, a vibration damping drive mechanism and a second vibration damping support member. The vibration damping piston is located in the vibration damping drive mechanism. The vibration damping drive mechanism is fixedly connected to one end of the second connecting rod. The other end of the second connecting rod is fixedly connected to the piston phasing mechanism. The second balancing mass block is arranged on the vibration damping piston. The second vibration damping support member is fixedly arranged on the end of the vibration damping piston away from the second connecting rod. The second vibration damping support member can support and reset the vibration damping piston. The vibration damping drive mechanism is used to drive the vibration damping piston to reciprocate along its axis. The axis of the vibration damping piston is coaxial with the axis of the pulse tube.

10. The integrated pulse tube refrigerator according to claim 9, characterized in that: The second vibration-damping support member is a double-leaf vibration-damping leaf spring fixedly connected to the vibration-damping piston.

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