CN113432758B - Ultra-low temperature portable dry furnace using Stirling refrigerator - Google Patents
Ultra-low temperature portable dry furnace using Stirling refrigerator Download PDFInfo
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- CN113432758B CN113432758B CN202110683871.8A CN202110683871A CN113432758B CN 113432758 B CN113432758 B CN 113432758B CN 202110683871 A CN202110683871 A CN 202110683871A CN 113432758 B CN113432758 B CN 113432758B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/005—Calibration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/14—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
Abstract
The invention discloses an ultra-low temperature portable dry furnace utilizing a Stirling refrigerator, which relates to the technical field of instrument calibration devices and comprises the Stirling refrigerator, wherein a furnace body is arranged on one side of the Stirling refrigerator, a coil pipe is spirally and circularly arranged around the furnace body, and a plurality of heat conducting devices are sleeved on the coil pipe; a heat pipe is connected between the Stirling refrigerator and the furnace body, and a vibration damper is arranged at one end of the heat pipe close to the furnace body. The dry-type furnace utilizing the Stirling refrigeration technology provided by the invention is formed by adopting the Stirling refrigerator, the furnace body, the coil pipe, the heat conduction device and the heat pipe, and a brand-new low-temperature refrigeration module is firstly applied to the portable dry-type furnace, so that the domestic blank is filled, and the portability of an ultralow-temperature detection instrument is realized.
Description
Technical Field
The invention belongs to the technical field of refrigeration and instrument calibration devices, and particularly relates to an ultralow-temperature portable dry furnace utilizing a Stirling refrigerator.
Background
A dry furnace, also called a dry shaft furnace, is a portable dry body temperature calibrator. The extensive applied field of dry-type stove or the calibration of temperature sensor in the laboratory compares with traditional liquid tank formula temperature calibrator, and general dry-type stove adopts the dry body piece to heat or refrigerate, and the speed of rising and falling the temperature promotes greatly, has reduced the equipment volume simultaneously greatly, can satisfy portable needs in the field application, but present existing dry-type stove has following problem:
firstly, although the dry furnace technology is mature, the temperature is basically in a temperature range of-40 to 1200 ℃, ultralow temperature (below-80 ℃) products are few, and meanwhile, dry furnace products cooled by a Stirling refrigerator do not exist;
and secondly, the low-temperature cooling measure is basically refrigeration of the semiconductor refrigeration piece, the efficiency is low, and the cooling speed is low.
Therefore, it is necessary to provide an ultra-low temperature portable dry furnace using a stirling cooler to solve the above problems, which can greatly increase the temperature increase and decrease speed of the dry furnace, further reduce the volume of the apparatus, make the carrying more convenient, and fill up the blank of the ultra-low temperature range of the dry furnace.
Disclosure of Invention
In view of the above problems, the present invention provides a ultra-low temperature portable dry furnace using a stirling cooler to solve the problems set forth in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an utilize portable dry-type stove of ultra-low temperature of stirling refrigerator, includes the stirling refrigerator, one side of stirling refrigerator is equipped with the furnace body, the spiral encircles around the furnace body and installs the coil pipe, a plurality of heat-transfer devices have been cup jointed on the coil pipe, be connected with the heat pipe between stirling refrigerator and the furnace body, the one end that the heat pipe is close to the furnace body is equipped with vibration damper.
Further, heat-transfer device includes first sleeve pipe, first sleeve pipe rotates and cup joints on the coil pipe, first sleeve pipe both ends all rotate on the coil pipe and cup jointed the lantern ring, the top and the bottom of the lantern ring all have linked firmly the fixed plate, and one side of fixed plate perpendicular to furnace body runs through to peg graft and has had the gag lever post, first spring and second spring have been cup jointed on the gag lever post, and first spring and second spring are separated by the fixed plate, and are a plurality of the one end that the gag lever post is close to the furnace body has linked firmly same semiconductor heating plate, two the relative one side of the lantern ring all slides and runs through to peg graft and has had the locating lever, and the locating lever has been cup jointed the third spring near first sheathed tube one end, and the locating lever corresponds the position a plurality of locating holes have been seted up to the annular on the lantern ring.
Further, vibration damper includes the second sleeve pipe, the second sleeve pipe slides and cup joints on the heat pipe, the sheathed tube bottom of second has linked firmly two telescopic links, and has cup jointed the fourth spring on the telescopic link, two the bottom of telescopic link has linked firmly same backup pad, the backup pad links firmly with the side of furnace body perpendicularly, the fifth spring has been cup jointed on the heat pipe, and the fifth spring is located the one end that the second sleeve pipe is close to the furnace body.
Furthermore, both ends of the heat pipe are connected with metal hoses, the two metal hoses are respectively connected with the furnace body and the Stirling refrigerator, and a refrigerant is filled in the heat pipe.
Further, the top of first sheathed tube has linked firmly the handle, the first sleeve pipe surface of the position of handle symmetry has linked firmly a plurality of ARC baffles, smooth connection between ARC baffle and the first sleeve pipe, and ARC baffle highly to keeping away from the direction of handle and uprising gradually apart from first sleeve pipe surface.
Furthermore, one side of the semiconductor heating plate opposite to the first sleeve is provided with an arc-shaped groove matched with the semiconductor heating plate, a plurality of slots are formed in the arc-shaped groove, and the slots are in one-to-one correspondence with the arc-shaped partition plates.
Furthermore, one end of the positioning rod, which is close to the first sleeve, is designed to be an inclined surface, and the direction of the inclined surface is opposite to the rotation direction of the first sleeve.
Furthermore, the sum of the length of the first spring, the length of the second spring and the thickness of the fixing plate is equal to the length of the limiting rod.
Furthermore, the furnace body is a stainless steel cavity in a cuboid shape, and a probe can be placed in the furnace body.
The invention has the technical effects and advantages that:
1. the dry-type furnace utilizing the Stirling refrigeration technology provided by the invention adopts the Stirling refrigerator, the furnace body, the coil pipe, the heat conduction device and the heat pipe to form the whole dry-type furnace, and firstly adopts a brand-new low-temperature refrigeration module to be applied to the portable dry-type furnace, so that the domestic blank is filled, and the portability of an ultra-low temperature detection instrument is realized;
2. according to the invention, the arc-shaped partition plate is arranged, when the distance from the coil pipe to the surface of the furnace body is greater than the length of the second spring, the handle is pulled, and the higher part of the arc-shaped partition plate gradually moves towards the inside of the slot, so that when the semiconductor heating sheet is tightly contacted with the furnace body under the extrusion of the arc-shaped partition plate, the effective exchange of energy between the coil pipe and the furnace body is ensured, and the arc-shaped partition plate is inserted into the slot, so that the contact area between the arc-shaped partition plate and the first sleeve pipe is increased, and the change of the energy exchange rate between the semiconductor heating sheet and the first sleeve pipe caused by the change of the height of the arc-shaped partition plate is further avoided;
3. according to the invention, the vibration damping device is arranged, when the vibration generated by the Stirling refrigerator is transmitted to the furnace body through the heat pipe, the vibration in the vertical direction and the vibration in the horizontal direction can be respectively converted into the elastic potential energy of the fourth spring and the elastic potential energy of the fifth spring, and then the looseness between the two ends of the heat pipe and the furnace body and the Stirling refrigerator caused by the vibration of the Stirling refrigerator body is avoided by matching the two metal hoses, so that the stable operation of the Stirling refrigerator is ensured.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a front view of the present invention;
FIG. 2 is an enlarged view of portion A of FIG. 1 according to the present invention;
FIG. 3 is a side view of the semiconductor heat patch and collar of the present invention;
FIG. 4 is a front view of a semiconductor heat patch of the present invention;
fig. 5 is a side view of the bushing of the present invention.
In the figure: 1. a Stirling refrigerator; 2. a furnace body; 3. a coil pipe; 4. a heat conducting device; 41. a first sleeve; 42. a collar; 43. a limiting rod; 44. a first spring; 45. a second spring; 46. a semiconductor heating sheet; 47. positioning a rod; 48. a third spring; 5. positioning holes; 6. a vibration damping device; 61. a second sleeve; 62. a telescopic rod; 63. a fourth spring; 64. a support plate; 65. a fifth spring; 7. a metal hose; 8. a handle; 9. an arc-shaped partition plate; 10. a slot; 11. a heat pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention provides a ultra-low temperature portable dry furnace using a stirling cryocooler, as shown in fig. 1 and 2, comprising a stirling cryocooler 1, characterized in that: one side of stirling refrigerator 1 is equipped with furnace body 2, the spiral is encircleed around furnace body 2 and is installed coil pipe 3, coil pipe 3 is not only limited to the spiral shape, and coil pipe 3 can closely encircle furnace body 2, a plurality of heat-conducting devices 4 have been cup jointed on coil pipe 3, be connected with heat pipe 11 between stirling refrigerator 1 and the furnace body 2, the one end that heat pipe 11 is close to furnace body 2 is equipped with damping device 6.
As shown in fig. 2 and 3, the heat conducting device 4 includes a first sleeve 41, the first sleeve 41 is rotatably sleeved on the coil 3, the sleeve rings 42 are rotatably sleeved on the coil 3 at two ends of the first sleeve 41, the top and the bottom of each sleeve ring 42 are fixedly connected with a fixing plate, one side of each fixing plate perpendicular to the furnace body 2 is penetrated and inserted with a limiting rod 43, the limiting rod 43 is sleeved with a first spring 44 and a second spring 45, the first spring 44 and the second spring 45 are separated by the fixing plate, one end of each limiting rod 43 close to the furnace body 2 is fixedly connected with a same semiconductor heating plate 46, one side of each of the two opposite sleeves 42 is slidably penetrated and inserted with a positioning rod 47, one end of each positioning rod 47 close to the first sleeve 41 is sleeved with a third spring 48, and a plurality of positioning holes 5 are annularly arranged on the sleeve ring 42 at positions corresponding to the positioning rods 47.
As shown in fig. 1, the vibration damper 6 includes a second sleeve 61, the second sleeve 61 is slidably sleeved on the heat pipe 11, the bottom of the second sleeve 61 is fixedly connected with two telescopic rods 62, the telescopic rods 62 are sleeved with a fourth spring 63, the bottoms of the two telescopic rods 62 are fixedly connected with a same support plate 64, the support plate 64 is vertically and fixedly connected with the side surface of the furnace body 2, the heat pipe 11 is sleeved with a fifth spring 65, and the fifth spring 65 is located at one end of the second sleeve 61 close to the furnace body 2; because the Stirling refrigerator 1 performs refrigeration by means of isentropic expansion, in the refrigeration process, the Stirling refrigerator 1 generates relatively large noise and vibration along with the machine body, the vibration is divided into vibration in the horizontal direction and vibration in the vertical direction, when the vibration in the vertical direction is transmitted to the furnace body 2 through the heat pipe 11, the vibration can enable the telescopic rod 62 and the fourth spring 63 to correspondingly perform reciprocating telescopic operation, so that the vibration is converted into elastic potential energy of the fourth spring 63, when the vibration in the horizontal direction is transmitted to the heat pipe 11, the heat pipe 11 correspondingly performs reciprocating motion in the horizontal direction, the fifth spring 65 correspondingly extends and retracts, so that the vibration is converted into the elastic potential energy of the fifth spring 65, and the two metal hoses 7 are matched to avoid the looseness of the two ends of the heat pipe 11, the furnace body 2 and the Stirling refrigerator 1 caused by the vibration of the Stirling machine body, the stable operation of the stirling cooler 1 is ensured.
As shown in fig. 1, two ends of the heat pipe 11 are both connected with metal hoses 7, the two metal hoses 7 are respectively connected with the furnace body 2 and the stirling cryocooler 1, and the heat pipe 11 is filled with a refrigerant; because the metal hose 7 is relatively soft, the metal hose can be well connected between the furnace body 2 and the Stirling refrigerator 1 as well as between the heat pipe 11, and therefore looseness between the two ends of the heat pipe 11 and the furnace body 2 as well as between the Stirling refrigerator 1 and the Stirling refrigerator 1 due to vibration generated by the work of the Stirling refrigerator 1 is avoided.
As shown in fig. 2 and 5, a handle 8 is fixedly connected to the top of the first casing 41, a plurality of arc-shaped partition plates 9 are fixedly connected to the surface of the first casing 41 at positions symmetrical to the handle 8, the arc-shaped partition plates 9 are smoothly connected with the first casing 41, and the height of the arc-shaped partition plates 9 from the surface of the first casing 41 gradually increases towards the direction away from the handle 8; when the distance between the semiconductor heating piece 46 and the furnace body 2 needs to be adjusted, the handle 8 can be pulled to enable the first sleeve 41 to rotate, and the position of the arc-shaped partition plate 9 with different thicknesses is changed to be in contact with the semiconductor heating piece 46, so that the purpose of adjusting the semiconductor heating piece 46 is achieved.
As shown in fig. 1, fig. 2 and fig. 4, an arc-shaped groove matched with the first sleeve 41 is formed in one side of the semiconductor heating sheet 46 opposite to the first sleeve 41, a plurality of slots 10 are formed in the arc-shaped groove, and the plurality of slots 10 correspond to the plurality of arc-shaped partition plates 9 one by one; the slots 10 can be well matched with the arc-shaped partition plates 9, so that the contact area of the semiconductor heating sheets 46 and the arc-shaped partition plates 9 is increased, and the energy transfer is better.
As shown in fig. 2, 3 and 5, one end of the positioning rod 47 near the first sleeve 41 is designed as an inclined surface, and the direction of the inclined surface is opposite to the rotation direction of the first sleeve 41; when the first sleeve 41 is rotated, the inclined surface portion of the positioning rod 47 can be contracted under the squeezing action of the positioning hole 5, so that the rotation of the first sleeve 41 is not affected, and after the first sleeve 41 stops moving, the non-inclined surface portion of the positioning rod 47 can be clamped with the positioning hole 5, so that the first sleeve 41 is locked.
As shown in fig. 1 and 3, the sum of the length of the first spring 44, the length of the second spring 45 and the thickness of the fixing plate is equal to the length of the limiting rod 43; under the condition that the semiconductor heating sheet 46 is not stressed, the first spring 44 and the second spring 45 both keep a natural state, when the semiconductor heating sheet 46 can be in contact with the furnace body 2 under the condition that the semiconductor heating sheet 46 is not stressed, the first spring 44 can be compressed, so that the semiconductor heating sheet 46 can be tightly attached to the furnace body 2 under the reaction force of the first spring 44, when the semiconductor heating sheet 46 cannot be in contact with the furnace body 2 under the condition that the semiconductor heating sheet is not stressed, the distance between the semiconductor heating sheet 46 and the furnace body 2 can be changed by adjusting the first sleeve 41, so that the purpose of enabling the semiconductor heating sheet 46 and the furnace body 2 to be in contact is achieved, in the process, the second spring 45 can be compressed, and further the second spring 45 presses the semiconductor heating sheet 46 on the surface of the furnace body 2 due to the reaction force.
As shown in fig. 1, the furnace body 2 is a rectangular stainless steel cavity, and a probe can be placed in the furnace body; the probe can monitor the temperature in the furnace body 2, so that the temperature change condition in the furnace body can be intuitively known.
The working principle is as follows: because the existing dry-type furnace adopts a semiconductor refrigerating sheet for refrigeration, the efficiency is low, the cooling speed is low, in addition, the temperature range of the existing dry-type furnace is between 40 ℃ below zero and 1200 ℃, the ultra-low temperature field is not involved, and in addition, no dry-type furnace product for cooling by using the Stirling refrigerator 1 is provided domestically, the invention mainly solves the problems of how to improve the temperature rise and fall speed of the dry-type furnace, further reduces the volume of the equipment, is more convenient to carry, and fills the blank of the ultra-low temperature range of the dry-type furnace; the specific measures and the using process are as follows: before use, the coil 3 is wound on the surface of the furnace body 2, because the surface of the furnace body 2 is not very flat, and meanwhile, the coil 3 is bent to a certain extent, so that the distances from various places of the coil 3 to the surface of the furnace body 2 are different, when the distance from the coil 3 to the surface of the furnace body 2 is smaller than the length of the second spring 45, and when the semiconductor heating sheet 46 is in contact with the surface of the furnace body 2, the semiconductor heating sheet 46 starts to compress the first spring 44 due to pressure, so that the distance between the semiconductor heating sheet 46 and the furnace body 2 is increased, and at the moment, the first spring 44 enables the semiconductor heating sheet 46 to be attached to the surface of the furnace body 2 due to reaction force, so that the coil 3 can better conduct cold or heat through the semiconductor heating sheet 46;
when the distance from the coil pipe 3 to the surface of the furnace body 2 is greater than the length of the second spring 45, the handle 8 is pulled downwards at the moment, so that the first sleeve pipe 41 starts to rotate by taking the coil pipe 3 as an axis under the driving of the handle 8, and the higher part of the arc-shaped partition plate 9 gradually moves towards the slot 10 on the semiconductor heating sheet 46, in the process, the positioning rod 47 is gradually pulled away from the positioning hole 5 under the combined action of the positioning hole 5 and the inclined surface thereof, so that the first sleeve pipe 41 can smoothly rotate, along with the continuous movement of the arc-shaped partition plate 9, the semiconductor heating sheet 46 gradually approaches to the furnace body 2 under the extrusion of the arc-shaped partition plate 9, the second spring 45 is continuously compressed in the process, when the semiconductor heating sheet 46 is in close contact with the furnace body 2, the handle 8 is pulled, and at the moment, the positioning rod 47 is clamped in the corresponding positioning hole 5 under the action of the third spring 48, so as to lock the first sleeve pipe 41, the second spring 45 enables the semiconductor heating sheet 46 to cling to the surface of the furnace body 2 due to the counterforce, so that the semiconductor heating sheet 46 can effectively exchange heat or cold generated by the Stirling refrigerator 1 with the furnace body 2 through the coil pipe 3, the arc-shaped partition plate 9 is inserted into the slot 10, the contact area between the arc-shaped partition plate 9 and the first sleeve pipe 41 is increased, and the change of the energy exchange rate between the semiconductor heating sheet 46 and the first sleeve pipe 41 caused by the change of the height of the arc-shaped partition plate 9 is avoided;
then the furnace body 2 and the Stirling refrigerator 1 are connected together through the heat pipe 11 and the metal hose 7, when the Stirling refrigerator 1 works, the generated cold or heat is conveyed into the coil pipe 3 through the heat pipe 11, and when the conveyed cold or heat reaches each semiconductor heating sheet 46 along the coil pipe 3, the cold or heat uniformly cools or heats the furnace body 2 through the semiconductor heating sheets 46; in addition, when the stirling refrigerating machine 1 delivers cold energy, when the cold energy passes through the heat pipe 11, the refrigerant in the heat pipe 11 can accelerate the conduction speed of the cold energy, so that the cold energy is accelerated to enter the coil pipe 3, and finally the furnace body 2 is rapidly cooled through the semiconductor heating plate 46, thereby improving the refrigerating efficiency.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (4)
1. A ultra-low temperature portable dry furnace using a Stirling refrigerator, comprising a Stirling refrigerator (1), characterized in that: a furnace body (2) is arranged on one side of the Stirling refrigerator (1), a coil pipe (3) is spirally and circularly arranged on the periphery of the furnace body (2), a plurality of heat conducting devices (4) are sleeved on the coil pipe (3), a heat pipe (11) is connected between the Stirling refrigerator (1) and the furnace body (2), and a damping device (6) is arranged at one end, close to the furnace body (2), of the heat pipe (11);
the heat conduction device (4) comprises a first sleeve (41), the first sleeve (41) is rotatably sleeved on the coil (3), lantern rings (42) are rotatably sleeved on the coil (3) at two ends of the first sleeve (41), fixing plates are fixedly connected to the tops and the bottoms of the lantern rings (42), one side, perpendicular to the furnace body (2), of each fixing plate is provided with a limiting rod (43) in a penetrating and inserting mode, the limiting rods (43) are sleeved with a first spring (44) and a second spring (45) in a sleeved mode, the first spring (44) and the second spring (45) are separated by the fixing plates, one end, close to the furnace body (2), of each limiting rod (43) is fixedly connected with a same semiconductor heating sheet (46), one side, opposite to the two lantern rings (42), of each fixing rod (47) in a sliding and inserting mode, one end, close to the first sleeve (41), of each fixing rod (47) is provided with a third spring (48) in a sleeved mode, a plurality of positioning holes (5) are annularly formed in the lantern ring (42) at the position corresponding to the positioning rod (47);
the damping device (6) comprises a second sleeve (61), the second sleeve (61) is sleeved on the heat pipe (11) in a sliding mode, the bottom of the second sleeve (61) is fixedly connected with two telescopic rods (62), the telescopic rods (62) are sleeved with a fourth spring (63), the bottoms of the two telescopic rods (62) are fixedly connected with a same supporting plate (64), the supporting plate (64) is vertically and fixedly connected with the side face of the furnace body (2), the heat pipe (11) is sleeved with a fifth spring (65), and the fifth spring (65) is located at one end, close to the furnace body (2), of the second sleeve (61);
two ends of the heat pipe (11) are connected with metal hoses (7), the two metal hoses (7) are respectively connected with the furnace body (2) and the Stirling refrigerator (1), and a refrigerant is filled in the heat pipe (11);
the top of the first sleeve (41) is fixedly connected with a handle (8), the surface of the first sleeve (41) at the position where the handle (8) is symmetrical is fixedly connected with a plurality of arc-shaped partition plates (9), the arc-shaped partition plates (9) are smoothly connected with the first sleeve (41), and the height of the arc-shaped partition plates (9) from the surface of the first sleeve (41) is gradually increased towards the direction far away from the handle (8);
one side of the semiconductor heating sheet (46) opposite to the first sleeve (41) is provided with an arc-shaped groove matched with the semiconductor heating sheet, a plurality of slots (10) are formed in the arc-shaped groove, and the slots (10) are in one-to-one correspondence with the arc-shaped partition plates (9).
2. A ultra-low temperature portable dry furnace using a stirling cooler in accordance with claim 1, wherein: one end, close to the first sleeve (41), of the positioning rod (47) is designed to be an inclined surface, and the direction of the inclined surface is opposite to the rotating direction of the first sleeve (41).
3. A ultra-low temperature portable dry furnace using a stirling cooler in accordance with claim 1, wherein: the sum of the length of the first spring (44), the length of the second spring (45) and the thickness of the fixing plate is equal to the length of the limiting rod (43).
4. A ultra-low temperature portable dry furnace using a stirling cooler in accordance with claim 1, wherein: the furnace body (2) is a stainless steel cavity in a cuboid shape, and a probe can be placed in the furnace body.
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