CN214250185U - Split type pulse tube refrigerator - Google Patents

Abstract

The utility model discloses a split type pulse tube refrigerator, which comprises a pulse tube component, an external gas reservoir and a compressor which are arranged in a split way, wherein the compressor is communicated with the pulse tube component through an external connecting pipe, and the external gas reservoir is communicated with the pulse tube component through an inertia pipe; the compressor comprises a shell, linear motors on two sides in the shell are symmetrically arranged, each linear motor comprises a piston shaft, the end part of each piston shaft is connected with a piston head, a permanent magnet group is connected onto each piston shaft, each permanent magnet group is positioned between an inner magnetic pole and an outer magnetic pole, and a conductive coil is connected onto each outer magnetic pole; the shell is connected with a cylinder seat, a piston cavity is formed in the cylinder seat, the inner magnetic pole and the outer magnetic pole are both connected to the cylinder seat, and piston heads of the linear motors on two sides in the shell are both connected in the piston cavity in a sliding manner; the cylinder block is also provided with a first air inlet and a first air outlet. The utility model discloses effectively reduced holistic vibration of refrigerator and noise, promoted mechanical conversion efficiency.

Description

Split type pulse tube refrigerator

Technical Field

The utility model relates to a backheat refrigeration technology field, concretely relates to split type pulse tube refrigerator.

Background

The pulse tube refrigerator is a common device in a regenerative low-temperature refrigerator, and is widely applied to the fields of aerospace, high-temperature superconductivity, infrared detection, biomedicine and the like in view of the advantages of simple structure, low operation noise, low vibration magnitude, long service life, high reliability and the like.

The ultra-low temperature refrigerator in the deep refrigeration temperature range of 120K-200K generally adopts a rotary or crank connecting rod type compressor-driven cascade refrigerator as a refrigeration source, has large integral vibration and noise and low mechanical conversion efficiency, and cannot meet the use requirement.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a split type pulse tube refrigerator can effectively reduce holistic vibration of refrigerator and noise, does benefit to promotion machinery conversion efficiency.

In order to solve the technical problem, the utility model provides a technical scheme as follows:

a split type pulse tube refrigerator comprises a pulse tube assembly, an external gas reservoir and a compressor, wherein the pulse tube assembly, the external gas reservoir and the compressor are arranged in a split mode, the compressor and the pulse tube assembly are communicated through an external connecting pipe, the external gas reservoir and the pulse tube assembly are communicated through an inertia pipe, the compressor comprises a shell, linear motors are arranged on two sides inside the shell, the linear motors on two sides inside the shell are symmetrically arranged, each linear motor comprises a piston shaft, a piston head is connected to the end portion of each piston shaft, a permanent magnet group is connected to each piston shaft and formed by enclosing a plurality of permanent magnets, each permanent magnet adopts radial magnetization, each permanent magnet group is located between an inner magnetic pole and an outer magnetic pole, a conductive coil is connected to each outer magnetic pole, and a cylinder seat is connected to the shell, the inner magnetic pole and the outer magnetic pole are connected to the cylinder seat, piston heads of linear motors on two sides of the interior of the shell are connected to the piston cavities in a sliding mode, the cylinder seat is further provided with a first air inlet and a first air outlet, the first air inlet is communicated with the interior of the shell, the first air outlet is communicated with the piston cavities, and the first air outlet is communicated with the pulse tube assembly through the external connecting tube.

In one embodiment, the cylinder block includes a seat body, a cylinder block is connected to the seat body, the piston cavity is formed inside the cylinder block, the seat body is connected to the housing, and the seat body is provided with the first air inlet and the first air outlet.

In one embodiment, the piston head is provided with a cavity inside, and the end of the cavity is connected with a cover.

In one embodiment, the permanent magnet group is connected with the piston shaft through a support cylinder, the permanent magnet group is annular, and permanent magnets in the permanent magnet group are embedded in the support cylinder.

In one embodiment, the conductive coil is wound on an annular coil frame, the annular coil frame is sleeved on the support cylinder, the outer magnetic pole is annular, the outer magnetic pole is formed by surrounding a plurality of magnetic pole blocks, clamping grooves are formed in the magnetic pole blocks, and the clamping grooves are clamped on the conductive coil.

In one embodiment, a leaf spring assembly is connected to each piston shaft and is connected to the cylinder block via a leaf spring support.

In one embodiment, the pulse tube assembly comprises a cold end heat exchanger, a heat regenerator and a hot end heat exchanger which are sequentially connected, the hot end heat exchanger is communicated with the heat regenerator, a pulse tube is connected inside the heat regenerator, the axis of the pulse tube coincides with the axis of the heat regenerator, one end of the pulse tube is communicated with the cold end heat exchanger, the other end of the pulse tube is communicated with the inertia tube, and the hot end heat exchanger is connected with the external connecting tube.

In one embodiment, a flow guide part is connected inside the hot-end heat exchanger, a thermal sleeve core is connected inside the flow guide part, an air hole is arranged inside the thermal sleeve core, one end of the air hole is communicated with the pulse tube, and the other end of the air hole is communicated with the inertia tube.

In one embodiment, the regenerator is filled with a heat storage medium, and the heat storage medium is made of stainless steel wool or a non-metallic porous member.

In one embodiment, the external gas reservoir comprises a base, a gas reservoir body is connected to the base, the inertia tube is wound outside the gas reservoir body, one end of the inertia tube is communicated with the pulse tube assembly, and the other end of the inertia tube is communicated with the gas reservoir body.

The utility model discloses following beneficial effect has: the utility model discloses a split type pulse tube refrigerator can effectively reduce the vibration and the noise of refrigerator, has promoted mechanical conversion efficiency for the life of refrigerator, refrigerating output and refrigeration efficiency all obtain great promotion.

Drawings

Fig. 1 is a schematic three-dimensional structure diagram of a split pulse tube refrigerator of the present invention;

fig. 2 is a schematic diagram of the internal structure of the split pulse tube refrigerator shown in fig. 1;

FIG. 3 is a schematic view of the structure of the external gas reservoir in FIG. 2

FIG. 4 is a schematic diagram of the compressor of FIG. 2;

FIG. 5 is a cross-sectional view taken in the direction D-D of FIG. 2;

FIG. 6 is a schematic view of the compressor of FIG. 2 with the shell removed;

FIG. 7 is a schematic view of the installation of two linear motors inside the compressor of FIG. 2;

FIG. 8 is an angled schematic view of the linear motor of FIG. 2;

FIG. 9 is a schematic view of another angular configuration of the linear motor of FIG. 8;

FIG. 10 is a schematic view of the structure of the cylinder block of FIG. 2;

in the figure:

1. an external connecting pipe;

2. an inertial tube;

3. the external air reservoir 31, the base 32, the air reservoir body 33 and the second air inlet valve;

4. the heat exchanger comprises a pulse tube assembly, 41, a cold-end heat exchanger, 42, a heat regenerator, 421, a heat storage medium, 43, a pulse tube, 44, a hot-end heat exchanger, 441, a flow guide piece, 442, a thermal sleeve core, 4421, air holes, 45, a first air inlet valve, 46, a pipeline joint, 47, a stainless steel wire mesh layer, 48, an adapter, 49 and an inertia pipe joint;

5. the compressor, 51, a housing, 511, a first housing, 512, a second housing, 52, a cylinder block, 521, a base body, 5211, a first air inlet, 5212, a first air outlet, 522, a cylinder body, 5221, a first cylinder body, 5222, a second cylinder body, 53, a piston cavity, 54, a linear motor, 541, a piston shaft, 542, a piston head, 5421, a cover, 5422, a cavity, 543, a permanent magnet group, 5431, a permanent magnet, 544, an inner magnetic pole, 545, an outer magnetic pole, 5451, a magnetic pole segment, 5452, a clamping groove, 5453, a magnetic conductive sharp corner, 546, a conductive coil, 5461, an annular coil rack, 547, a support cylinder, 548, a compression ring, 549, a plate spring assembly, 55, a plate spring support, 56, a first fastening bolt, 57, a second fastening bolt, 58, an inner gasket, 59, an outer gasket, 60, an inflation valve, 61, a locking nut, 62 and a third fastening bolt.

Detailed Description

The present invention is further described with reference to the following drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.

As shown in fig. 1-2, the present embodiment discloses a split type pulse tube refrigerator, which includes a pulse tube assembly 4, an external gas reservoir 3, and a compressor 5, wherein the pulse tube assembly 4, the external gas reservoir 3, and the compressor 5 are separately arranged, that is, they are independently arranged, the compressor 5 and the pulse tube assembly 5 are communicated with each other through an external connecting tube 1, and the external gas reservoir 3 and the pulse tube assembly 4 are communicated with each other through an inertia tube 2; the pulse tube component 4, the external air reservoir 3 and the compressor 5 are independently arranged, so that the three components are separated and isolated, the interference of vibration generated by the external air reservoir 3 and the compressor 5 on the pulse tube component 4 is reduced and avoided, and the pulse tube component 4 is convenient to cool precision equipment sensitive to vibration;

the compressor 5 comprises a shell 51, linear motors 54 are arranged on two sides inside the shell 51, the linear motors 54 on the two sides inside the shell 51 are symmetrically arranged, each linear motor 54 comprises a piston shaft 541, a piston head 542 is connected to the end of each piston shaft 541, a permanent magnet group 543 is connected to each piston shaft 541, each permanent magnet group 543 is formed by surrounding a plurality of permanent magnets 5431, each permanent magnet 5431 is magnetized in the radial direction, each permanent magnet group 543 is located between an inner magnetic pole 544 and an outer magnetic pole 545, and a conductive coil 546 is connected to each outer magnetic pole 545;

the shell 51 is connected with a cylinder seat 52, a piston cavity 53 is formed in the cylinder seat 52, the piston cavity 53 is positioned in the shell 51, an inner magnetic pole 544 and an outer magnetic pole 545 are both connected to the cylinder seat 52, and piston heads of linear motors 54 on two sides in the shell 51 are both connected in the piston cavity 53 in a sliding manner;

the cylinder block 52 is further provided with a first air inlet 5211 and a first air outlet 5212, the first air inlet 5211 is communicated with the interior of the housing 51 so as to be used for filling the interior of the housing 51 with the refrigerant gas, the first air outlet 5212 is communicated with the piston cavity 53, and the first air outlet 5212 is communicated with the pulse tube assembly 4 through an external connecting tube 1.

In the structure, the linear motors 54 on the two sides in the shell 51 are symmetrically arranged, so that the motion phases of the piston heads 542 are different by 180 degrees, axial vibration can be effectively offset, and noise is reduced; in addition, the pulse tube assembly 4 and the inertia tube phase modulation structure have no moving parts, so that the vibration magnitude is greatly reduced;

in addition, the structure adopts a structure that the inner magnetic pole 544, the outer magnetic pole 545 and the permanent magnet group 543 are matched, the permanent magnet group 543 is located between the inner magnetic pole 544 and the outer magnetic pole 545, and the inner magnetic pole 544 and the outer magnetic pole 545 form a magnetic flux loop inside and outside the permanent magnet group 543, so that a magnetic circuit is more complete and uniform, the stability of the permanent magnet 5431 that cuts magnetic induction lines to generate periodically alternating axial electromagnetic force in the reciprocating linear oscillation process is better ensured, the eddy current loss under an alternating magnetic field is reduced, and the efficiency of the compressor is improved.

It is to be understood that the first inlet port 5211 can also be used as a vent to vent the refrigerant gas within the housing 51, if desired. To better control the inflation and deflation, an inflation valve 60 may be connected to the first air inlet 5211. The cylinder block 52 and the charging valve 60 are fixed by screwing. The piston chamber 53 and the piston head 542 are in clearance fit, and after the refrigerant gas is charged into the housing 51 through the first gas inlet 5211, the gas enters the interior of the piston chamber 53 through the clearance between the piston chamber 53 and the piston head 542.

In one embodiment, the external connecting tube 1 is a red copper hose.

As shown in fig. 10, in one embodiment, the cylinder block 52 includes a base 521, a cylinder block 522 is connected to the base 521, a piston chamber 53 is formed inside the cylinder block 522, the base 521 is connected to the housing 51, and a first air inlet 5211 and a first air outlet 5212 are disposed on the base 521.

In one embodiment, one end of the cylinder 522 extends to one side of the seat 521 to form a first cylinder 5221, and the other end of the cylinder 522 extends to the other side of the seat 521 to form a second cylinder 5222.

In one embodiment, as shown in fig. 1 and 4, the housing 51 includes a first housing 511 and a second housing 512, and one end of the base 521 is connected to the first housing 511, and the other end is connected to the second housing 512. The first housing 511 and the second housing 512 are connected by a third fastening bolt 62.

Further, the first cylinder 5221 and the second cylinder 5222 are symmetrically disposed. The piston head 542 of the linear motor 54 on one side inside the housing 51 is slidably connected in the first cylinder 5221, and the piston head 542 of the linear motor 54 on the other side inside the housing 51 is slidably connected in the second cylinder 5222.

In one embodiment, the piston head 542 is provided with a cavity 5422 therein to reduce the mass of motion, and a cap 5421 is attached to the end of the cavity 5422 to close the cavity 5422 to form a gas compression surface to facilitate compression of the gas.

Further, the piston shaft 541, the piston head 542 and the cover 5421 are made of stainless steel.

In one embodiment, the piston head 542 may have a wear-resistant liner (PVC) bonded to the outer surface.

In one embodiment, as shown in fig. 5, the permanent magnet group 543 is connected with the piston shaft 541 through the supporting cylinder 547, the permanent magnet group 543 is ring-shaped, and the permanent magnets 5431 in the permanent magnet group 543 are embedded in the supporting cylinder 547. For example, 8 tile-shaped permanent magnets 5431 are spliced into an annular permanent magnet group 543 through a die and embedded inside the receptacle 547. Above-mentioned this embedded structure can improve permanent magnet 5431's mechanical strength, plays better anti-drop effect, has improved the connection reliability to promote the mechanical stability of motor.

Further, the permanent magnet 5431 is made of sintered neodymium iron boron, and the supporting tube 547 is made of stainless steel.

In one embodiment, the supporting cylinder 547 is sleeved on the piston shaft 541, the piston head 542 coincides with the axis of the supporting cylinder 547, and the piston head 542 and the supporting cylinder 547 are screwed and fixed by a countersunk screw.

In one embodiment, as shown in fig. 7, 8 and 9, the conductive coil 546 is wound around the annular bobbin 5461, the annular bobbin 5461 is sleeved on the supporting tube 547, the outer pole 545 is annular, the outer pole 545 is formed by surrounding a plurality of magnetic pole segments 5451, the magnetic pole segments 5451 are provided with the clamping grooves 5452, and the clamping grooves 5452 are clamped on the conductive coil 546.

In one embodiment, the annular bobbin 5461 is made of a non-metal material, and the magnetic pole sub-blocks 5451 are made of silicon steel sheets, for example, silicon steel sheets with a thickness of 0.5mm may be selected.

Further, both ends of the magnetic pole sub-block 5451 are provided with magnetic conductive sharp corners 5453.

Specifically, when the outer pole 545 is installed, the conductive coil 546 (copper enameled wire) is uniformly wound on the annular coil rack 5461 with the winding number of 200 turns, then each pole segment 5451 is clamped on the conductive coil 546 to form an assembly, and then the assembly is installed on the cylinder base 52 through a centering die and is fixed by coating a metal adhesive.

In one embodiment, the inner pole 544 is also annular, and the inner pole 544 is made of a silicon steel sheet, for example, a silicon steel sheet with a thickness of 0.5mm may be selected.

Specifically, the inner magnetic pole 544 is fixed on the outer wall of the cylinder 522, and in order to ensure the stability of the fixation of the inner magnetic pole 544, a pressing ring 548 is installed at the end of the cylinder 522 and is coated with a metal adhesive for fixation, so that the inner magnetic pole 544 is limited by the pressing ring 548.

In one embodiment, as shown in fig. 2 and 6, a leaf spring assembly 549 is connected to each of the piston shafts 541, the leaf spring assembly 549 is formed by stacking a plurality of leaf springs, and the leaf spring assembly 549 is connected to the cylinder block 52 through a leaf spring bracket 55.

Further, the plate spring holder 55 and the holder body 521 of the cylinder holder 52 are connected. Outer pole 545 is located between leaf spring support 55 and housing 521.

Specifically, when the plate spring assembly 549 is installed, each plate spring is sleeved on the piston shaft 541, a plate spring inner gasket 58 and an outer gasket 59 are respectively assembled between every two adjacent plate springs, finally, the plate spring assembly 549 and the piston shaft 541 are locked and fixed together by using a locking nut 61, meanwhile, the plate spring assembly 549 and the plate spring support 55 are connected and fixed through a second fastening bolt 57 and are reinforced by gluing, and then, the plate spring support 55 and the seat body 521 of the cylinder seat 52 are connected through a first fastening bolt 56. Wherein, the plate spring is made of 60Si2Mn and has a thickness of 1.5 mm.

It can be understood that, when the piston shaft 541 moves, the plate spring support 55, the cylinder block 52, the outer magnetic pole 545 and the inner magnetic pole 544 are stationary, the piston assembly (the piston shaft 541 and the piston head 542), the bracket 547 and the permanent magnet set 543 move together, and the movement of the piston assembly drives the plate spring assembly 549 to generate elastic deformation.

In one embodiment, as shown in fig. 2, pulse tube assembly 4 includes a cold-end heat exchanger 41, a regenerator 42 and a hot-end heat exchanger 44 connected in sequence, where hot-end heat exchanger 44 is communicated with regenerator 42, pulse tube 43 is connected inside regenerator 42, the axes of pulse tube 43 and regenerator 42 are coincident to facilitate cold-end mechanical coupling, one end of pulse tube 43 is communicated with cold-end heat exchanger 41, the other end is communicated with inertance tube 2, and hot-end heat exchanger 44 is connected with external connecting tube 1.

In one embodiment, a flow guide element 441 is connected inside the hot-side heat exchanger 44, a thermal sleeve core 442 is connected inside the flow guide element 441, an air hole 4421 is formed inside the thermal sleeve core 442, one end of the air hole 4421 is communicated with the pulse tube 43, and the other end of the air hole 4421 is communicated with the inertia tube 2. The flow loss of lateral air inflow can be reduced through the arrangement of the flow guide part 441, a better circumferential sealing effect can be achieved through the arrangement of the thermal sleeve core 442, the axial air blowby phenomenon is effectively avoided, partial air can be prevented from entering the inertia tube 2 through a side gap at the outer wall of the thermal sleeve core 442, and the phase modulation effect is better guaranteed.

Further, the thermal sleeve core 442 is a non-metal sleeve core, and interference fit is achieved through a thermal expansion process and the inner wall of the flow guide part 441, so that a good circumferential sealing effect is achieved.

In one embodiment, the fluid-directing member 441 is a red copper member and the thermal sleeve core 442 is ptfe.

In one embodiment, a plurality of slits are provided in each of the cold side heat exchanger 41 and the hot side heat exchanger 44 to increase the heat exchange area and facilitate the laminar flow of the gas to reduce losses. For example, the number of the slits of the cold-end heat exchanger 41 is 40, the slit width is 0.3mm, and the cold-end heat exchanger is formed by linear cutting; the hot end heat exchanger 44 has 55 slits with a width of 0.45mm, and is formed by linear cutting.

In one embodiment, the cold side heat exchanger 41 is made of red copper, and the regenerator 42 is made of stainless steel.

In one embodiment, warm end heat exchanger 44 is connected to regenerator 42 by a weld ring.

In one embodiment, a first air inlet valve 45 is connected to the hot side heat exchanger 44, and the first air inlet valve 45 is connected to the external connecting pipe 1 through a pipe joint 46.

In one embodiment, to improve the laminar flow of the gas flow inside the vessel 43 to ensure a better pumping effect, stainless steel wire mesh layers 47 with a certain thickness and mesh number are arranged at the upper and lower ports of the vessel 43 for laminar flow, for example, a stainless steel wire mesh layer 47 with a thickness of 2mm and a mesh number of 200 is arranged at the upper port of the vessel 43, and a stainless steel wire mesh layer 47 with a thickness of 4.5mm and a mesh number of 100 is arranged at the lower port of the vessel 43.

In one embodiment, the heat regenerator 42 is filled with the heat storage medium 421, and the heat storage medium 421 is made of stainless steel wool or a non-metallic porous member (such as polypropylene fiber and PC porous coiled material), so that the heat storage effect is good, and compared with the conventional annular stainless steel wire mesh filler, the heat storage device is more convenient to assemble, the labor cost in the assembling process is greatly reduced, and the process complexity is reduced.

Further, the filling porosity of the thermal storage medium 421 is 0.6 to 0.7.

In one embodiment, as shown in fig. 3, the external gas reservoir 3 comprises a base 31, a gas reservoir body 32 is connected to the base 31, an inertia tube 2 is wound around the outside of the gas reservoir body 32, one end of the inertia tube 2 is communicated with the vascular assembly 4, and the other end is communicated with the gas reservoir body 32.

Further, the inertia tube 2 is wound around the outer wall of the reservoir body 32 in a circumferentially uniform and side-by-side arrangement. The inertance tube 2 is led out from the pulse tube assembly 4 and then is wound to the upper plane of the gas reservoir body 32 from the lower end of the gas reservoir body 32 along the circumferential direction.

In one embodiment, the inertance tube 2 is made of copper tubing and the gas reservoir body 32 is made of aluminum alloy.

Specifically, the pulse tube assembly 4 is connected with a joint 48, the joint 48 is connected with an inertia tube joint 49, the inertia tube joint 49 is connected with the inlet end of the inertia tube 2, the upper part of the air reservoir body 32 is connected with a second air inlet valve 33, and the second air inlet valve 33 is connected with the outlet end of the inertia tube 2. The specification of the inertia pipe 2 is as follows: the inner diameter is 3mm, the outer diameter is 4mm, and the length is 3.5 mm; the internal volume of the reservoir body 32 is 300cm 3.

In one embodiment, the gas storage body 32 and the base 31 are connected by bolts, and have a split structure, so as to facilitate processing. In order to ensure air tightness, a rubber sealing ring is connected between the air storage body 32 and the base 31.

In one embodiment, helium can be used as the refrigerant gas, which has the advantages of safety, cleanness and environmental protection.

The refrigeration principle of the split pulse tube refrigerator of the embodiment is as follows: as shown in fig. 2, the linear motor 54 is started, so that the piston heads 542 of the linear motors 54 on both sides move in the piston cavity 53, the gas in the piston cavity 53 is compressed, the gas enters the external connecting pipe 1 through the first gas outlet 5212, enters the hot end heat exchanger 44 from the external connecting pipe 1, enters the heat regenerator 42 through the hot end heat exchanger 44, then enters the cold end heat exchanger 41, enters the expansion cavity inside the cold end heat exchanger 41, then enters the pulse tube 43 through the cold end heat exchanger 41, enters the inertia tube 2 through the pulse tube 43, and finally is output to the inside of the external gas reservoir 3 through the inertia tube 2; in the process, the gas reaches the expansion cavity inside the cold-end heat exchanger 41 through the heat regenerator 42, in the process, the heat regenerator 42 absorbs the gas heat to reduce the temperature of the gas, then the temperature of the gas reaches the lowest value in the expansion cavity, after the external heat is absorbed through low-temperature expansion, the heat is pumped to the inertia pipe 2 under the pushing of the sound work of the pulse pipe 43, and the temperature of the gas gradually rises in the process.

Similarly, when the piston head 542 in the linear motor 54 is controlled to run in the reverse direction, the gas flows in the reverse direction relative to the above process, that is, the gas inside the external gas reservoir 3 enters the pulse tube 43 through the inertia tube 2, then reaches the cold-end heat exchanger 41, enters the expansion chamber, then enters the heat regenerator 42 through the cold-end heat exchanger 41, then enters the hot-end heat exchanger 44, enters the external connecting tube 1 through the hot-end heat exchanger 44, and returns to the piston chamber 53 of the compressor 5 through the external connecting tube 1 and the first gas outlet 5212 in sequence; in the process, after the gas reaches the expansion cavity from the external gas storage 3, the gas temperature reaches the lowest, and then when the gas enters the hot-end heat exchanger 44 through the heat regenerator 42, the gas absorbs heat from the heat regenerator 42, and the temperature rises again, so that a thermodynamic cycle is completed.

The split pulse tube refrigerator of the embodiment can be applied to a large-cooling-capacity application scene under a deep refrigeration temperature zone, and is particularly suitable for an ultra-low-temperature refrigerator and a low-temperature refrigerator under the refrigeration temperature of 120K-200K.

The pulse tube refrigerator of the embodiment can effectively reduce the vibration and noise of the compressor 5 and improve the mechanical conversion efficiency through the structural design of the compressor, so that the service life of the refrigerator, the refrigerating capacity and the refrigerating efficiency are greatly improved; the compressor 5, the pulse tube component 4 and the external gas reservoir 3 are arranged in a split mode, so that the interference of vibration generated by the external gas reservoir 3 and the compressor 5 on the pulse tube component 4 is avoided, the vibration magnitude is reduced, and the pulse tube component 4 is convenient to cool precision equipment sensitive to vibration; the whole vibration is small, the assembly process is simple, and the processing is convenient.

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model. The protection scope of the present invention is subject to the claims.

Claims (10)

1. A split type pulse tube refrigerator is characterized by comprising a pulse tube assembly, an external gas reservoir and a compressor, wherein the pulse tube assembly, the external gas reservoir and the compressor are arranged in a split mode, the compressor and the pulse tube assembly are communicated through an external connecting pipe, the external gas reservoir and the pulse tube assembly are communicated through an inertia pipe, the compressor comprises a shell, linear motors are arranged on two sides inside the shell, the linear motors on two sides inside the shell are symmetrically arranged, each linear motor comprises a piston shaft, the end portion of each piston shaft is connected with a piston head, a permanent magnet group is connected onto each piston shaft and is formed by enclosing a plurality of permanent magnets, each permanent magnet adopts radial magnetization, the permanent magnet group is located between an inner magnetic pole and an outer magnetic pole, a conductive coil is connected onto each outer magnetic pole, and a cylinder seat is connected onto the shell, the inner magnetic pole and the outer magnetic pole are connected to the cylinder seat, piston heads of linear motors on two sides of the interior of the shell are connected to the piston cavities in a sliding mode, the cylinder seat is further provided with a first air inlet and a first air outlet, the first air inlet is communicated with the interior of the shell, the first air outlet is communicated with the piston cavities, and the first air outlet is communicated with the pulse tube assembly through the external connecting tube.

2. The split type pulse tube refrigerator according to claim 1, wherein the cylinder block comprises a base body, a cylinder block is connected to the base body, the cylinder block forms the piston chamber therein, the base body is connected to the housing, and the base body is provided with the first air inlet and the first air outlet.

3. The split pulse tube refrigerator of claim 1, wherein the piston head is provided with a cavity inside, and a sealing cover is connected to the end of the cavity.

4. The split pulse tube refrigerator according to claim 1, wherein the permanent magnet groups are connected with the piston shaft through a support cylinder, the permanent magnet groups are annular, and the permanent magnets in the permanent magnet groups are embedded in the support cylinder.

5. The split type pulse tube refrigerator according to claim 4, wherein the conductive coil is wound on an annular coil frame, the annular coil frame is sleeved on the supporting tube, the outer magnetic pole is annular, the outer magnetic pole is formed by surrounding a plurality of magnetic pole blocks, clamping grooves are arranged on the magnetic pole blocks, and the clamping grooves are clamped on the conductive coil.

6. The split pulse tube refrigerator of claim 1, wherein the piston shafts are connected with leaf spring assemblies, and the leaf spring assemblies are connected with the cylinder block through leaf spring supports.

7. The split pulse tube refrigerator according to claim 1, wherein the pulse tube assembly comprises a cold end heat exchanger, a regenerator and a hot end heat exchanger which are connected in sequence, the hot end heat exchanger is communicated with the regenerator, a pulse tube is connected inside the regenerator, the axes of the pulse tube and the regenerator are coincident, one end of the pulse tube is communicated with the cold end heat exchanger, the other end of the pulse tube is communicated with the inertia tube, and the hot end heat exchanger is connected with the external connecting tube.

8. The split pulse tube refrigerator according to claim 7, wherein a flow guide member is connected to the inside of the hot end heat exchanger, a heat jacket core is connected to the inside of the flow guide member, an air hole is formed in the heat jacket core, one end of the air hole is communicated with the pulse tube, and the other end of the air hole is communicated with the inertia tube.

9. The split-type pulse tube refrigerator according to claim 7, wherein the regenerator is filled with a heat storage medium, and the heat storage medium is made of stainless steel wool or a non-metallic porous member.

10. The split pulse tube refrigerator according to claim 1, wherein the external gas reservoir comprises a base, a gas reservoir body is connected to the base, the inertia tube is wound around the outside of the gas reservoir body, one end of the inertia tube is communicated with the pulse tube assembly, and the other end of the inertia tube is communicated with the gas reservoir body.

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