CN117007210A - Liquid nitrogen constant temperature detector - Google Patents
Liquid nitrogen constant temperature detector Download PDFInfo
- Publication number
- CN117007210A CN117007210A CN202310903928.XA CN202310903928A CN117007210A CN 117007210 A CN117007210 A CN 117007210A CN 202310903928 A CN202310903928 A CN 202310903928A CN 117007210 A CN117007210 A CN 117007210A
- Authority
- CN
- China
- Prior art keywords
- constant temperature
- liquid nitrogen
- piece
- sealing block
- cover body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 39
- 239000007788 liquid Substances 0.000 title claims abstract description 36
- 238000007789 sealing Methods 0.000 claims abstract description 63
- 238000009434 installation Methods 0.000 claims abstract description 8
- 238000001125 extrusion Methods 0.000 claims description 24
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 4
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 4
- 241001330002 Bambuseae Species 0.000 claims description 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 4
- 239000011425 bamboo Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000003556 assay Methods 0.000 claims 5
- 238000001514 detection method Methods 0.000 abstract description 21
- 230000000694 effects Effects 0.000 abstract description 8
- 238000007906 compression Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
-
- 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
- G01K15/002—Calibrated temperature sources, temperature standards therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
-
- 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
- G01K15/007—Testing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention discloses a constant-temperature detector for liquid nitrogen, which comprises a Dewar tank, wherein liquid nitrogen is filled in the Dewar tank, a filling opening is formed in the top of the Dewar tank, a cover body is fixedly connected to the filling opening, an inwards concave mounting cavity is formed in the middle of the cover body, a constant-temperature barrel is arranged in the mounting cavity, a temperature control part, a standard part and a measuring part are respectively connected to the constant-temperature barrel, the lower end of the constant-temperature barrel penetrates through the filling opening and extends into the liquid nitrogen, and the upper end of the constant-temperature barrel is detachably connected with the cover body through a sealing component; the sealing assembly comprises a lower sealing block positioned at the bottom of the installation cavity, the inner side of the lower sealing block is attached to the constant temperature cylinder through an inclined pressure surface, the outer side of the lower sealing block is provided with a limiting surface matched with the cover body, the top of the lower sealing block is connected with an upper sealing block through an annular part in a threaded manner, the lower end of the upper sealing block is provided with a step part, and the lower end of the step part penetrates through the annular part and is attached to the top surface of the constant temperature cylinder. The invention has the characteristics of good temperature control effect and high detection accuracy.
Description
Technical Field
The invention relates to a constant temperature detector, in particular to a liquid nitrogen constant temperature detector.
Background
The constant temperature detector is a detection tool for measuring the detection accuracy of a temperature sensor, and is used for detecting the temperature sensor and a standard temperature sensor in the same temperature environment, and then comparing the temperature values measured by the temperature sensor and the standard temperature sensor to judge the detection accuracy and the detection precision of a test piece. The existing constant temperature detector mainly comprises a test tank and a temperature control piece, wherein the surface of the test tank is coated with a heat insulation material to avoid interference caused by external environment temperature to the test temperature in the test tank, and meanwhile, the temperature control piece is used for heating or cooling the internal temperature of the test tank, so that the designated test temperature is obtained, and the test of the test piece at any temperature is realized.
However, the structure has the defects that, on one hand, the test tank is reduced in interference by wrapping the heat insulation material, but the external environment still affects the internal temperature of the test tank, and the detection accuracy of the temperature sensor is generally within the range of +/-0.1-0.2 ℃, so that once the temperature in the test tank is slightly interfered by the external environment, the temperature difference of different areas is easily caused, and the detection accuracy is further reduced. On the other hand, the temperature control part is only used for controlling the temperature of the test tank in a heating or refrigerating mode, so that the temperature control part stops working after the test tank reaches a specified temperature value, and is restarted for controlling the temperature when the temperature change in the test tank is detected; the temperature in the test tank cannot be kept within a constant temperature value, but can be continuously changed within a certain temperature range, so that the detection value of the temperature sensor can be fluctuated, continuous detection cannot be carried out in a constant temperature environment, and the detection effect of the temperature sensor is reduced.
Therefore, the existing constant-temperature detector has the problems of poor temperature control effect and low detection accuracy.
Disclosure of Invention
The invention aims to provide a liquid nitrogen constant-temperature detector. The device has the characteristics of good temperature control effect and high detection accuracy.
The technical scheme of the invention is as follows: the constant-temperature detector for the liquid nitrogen comprises a Dewar tank, wherein liquid nitrogen is filled in the Dewar tank, a filling opening is formed in the top of the Dewar tank, a cover body is fixedly connected to the filling opening, an inwards-sunken mounting cavity is formed in the middle of the cover body, a constant-temperature barrel is arranged in the mounting cavity, a temperature control part, a standard part and a measuring part are respectively connected to the constant-temperature barrel, the lower end of the constant-temperature barrel penetrates through the filling opening and extends into the liquid nitrogen, and the upper end of the constant-temperature barrel is detachably connected with the cover body through a sealing assembly; the sealing assembly comprises a lower sealing block positioned at the bottom of the installation cavity, the inner side of the lower sealing block is attached to the constant temperature cylinder through an inclined pressure surface, the outer side of the lower sealing block is provided with a limiting surface matched with the cover body, the top of the lower sealing block is connected with an upper sealing block through an annular part in a threaded manner, the lower end of the upper sealing block is provided with a step part, and the lower end of the step part penetrates through the annular part and is attached to the top surface of the constant temperature cylinder.
In the liquid nitrogen constant temperature detector, a plurality of extrusion parts are arranged around the bottom of the lower sealing block, adjacent extrusion parts are separated from each other through the first grooves, and the compression surface and the limiting surface are respectively positioned on the inner side and the outer side of the extrusion parts.
In the liquid nitrogen constant temperature detector, an extrusion surface attached to the pressed surface is arranged on the outer side of the constant temperature cylinder.
In the liquid nitrogen constant temperature detector, a plurality of limiting plates are annularly distributed at the bottom of the cover body and are respectively located in the first grooves between the extrusion parts.
In the liquid nitrogen constant temperature detector, the constant temperature tube comprises an outer tube and an inner tube, a vacuum area is formed between the outer tube and the inner tube, the tops of the outer tube and the inner tube are connected with each other through a plurality of sleeves, the temperature control piece, the standard piece and the measuring piece are respectively arranged in the plurality of sleeves, the lower ends of the temperature control piece, the standard piece and the measuring piece extend to the inner tube, and the upper ends of the temperature control piece, the standard piece and the measuring piece sequentially penetrate through the constant temperature tube and extend to the outer side of the sealing assembly.
In the liquid nitrogen constant temperature detector, the upper sealing block is provided with a plurality of mounting holes matched with the temperature control piece, the standard piece and the measuring piece, the mounting holes are internally connected with the supporting sleeve, and the lower end of the supporting sleeve penetrates through the mounting holes and extends into the sleeve.
In the liquid nitrogen constant temperature detector, a locking piece for fixing a temperature control piece, a standard piece or a measuring piece is arranged at the top of the supporting sleeve.
In the liquid nitrogen constant temperature detector, a gap is reserved between the side wall of the cover body and the inner wall of the filling port, and a plurality of openings for discharging nitrogen are formed in the top of the cover body.
Compared with the prior art, the invention has the following characteristics:
(1) According to the invention, the liquid nitrogen filled in the Dewar can is used for providing a stable external environment for the inner constant temperature cylinder, the constant temperature cylinder is continuously cooled by the liquid nitrogen at the temperature of-196 ℃ in the detection process, and the temperature in the constant temperature cylinder is simultaneously raised by the temperature control part in the constant temperature cylinder, so that the temperature in the constant temperature cylinder is controlled by the cooperation of the liquid nitrogen and the constant temperature part to be maintained at a relatively constant temperature value, the temperature accuracy detection of the measuring part in the range of-80 ℃ to-196 ℃ is realized, and the up-down fluctuation of the temperature in the constant temperature cylinder in the detection process is reduced; on the basis, a vacuum area is formed between the outer cylinder and the inner cylinder, so that the cooling efficiency of liquid nitrogen to the inner cylinder can be reduced, the temperature of the inner cylinder is slowly reduced under the action of a refrigerant, namely, the temperature change rate of the inner cylinder is reduced, the temperature of the inner cylinder is conveniently regulated and controlled by the temperature control piece, and the temperature control effect and the detection accuracy of the measuring piece are further improved;
(2) The connection structure of the constant temperature cylinder, the cover body and the sealing assembly is limited, so that the constant temperature cylinder can be directly inserted into the dewar tank from the filling opening during installation, and the constant temperature cylinder is locked through the matching of the upper sealing block and the lower sealing block, so that the disassembly, assembly and fixation of the constant temperature cylinder are realized, and the assembly of operators is facilitated; the upper sealing block and the lower sealing block can also mutually separate the top of the constant-temperature cylinder from the external environment after being connected, thereby having the heat preservation effect and further improving the temperature stability of the inner cylinder;
(3) Through the structural cooperation of the sleeve, the mounting hole and the supporting sleeve, the fixed temperature cylinder can also be connected with the upper sealing block and the fixed temperature cylinder by utilizing the insertion connection of the supporting sleeve after being extruded and fixed, and under the structure, the friction force between the fixed temperature cylinder and the lower sealing block can rotate and limit the upper sealing block, namely, the loosening and the unscrewing of the upper sealing block are avoided, and the fixing effect of the sealing assembly and the fixed temperature cylinder after being mounted is further improved; on the other hand, through the limitation of the structure, the cover body is not required to be provided with a structural part for fixing the sealing assembly and the constant temperature cylinder, so that the processing difficulty of the cover body is effectively reduced;
therefore, the invention has the characteristics of good temperature control effect and high detection accuracy.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is an enlarged view of FIG. 1 in the direction A;
FIG. 3 is a top view of the lower seal block;
fig. 4 is an enlarged view of fig. 1 in the B direction.
The marks in the drawings are: the device comprises a 1-Dewar tank, a 2-cover body, a 3-installation cavity, a 4-constant temperature cylinder, a 5-temperature control part, a 6-standard part, a 7-measuring part, an 8-lower sealing block, a 9-compression surface, a 10-limiting surface, an 11-annular part, a 12-upper sealing block, a 13-first groove, a 14-second groove, a 15-limiting plate, a 16-sleeve, a 17-installation hole, a 18-supporting sleeve, a 801-extrusion part and a 121-step part.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not intended to be limiting.
Examples. The constant temperature detector for liquid nitrogen is shown in figure 1, and comprises a Dewar tank 1, wherein a liquid nitrogen filling port is formed in one side of the Dewar tank 1, liquid nitrogen is filled in the Dewar tank 1, a filling port is formed in the top of the Dewar tank 1, a cover body 2 is fixedly connected to the filling port, an inwards concave mounting cavity 3 is formed in the middle of the cover body 2, a constant temperature cylinder 4 is arranged in the mounting cavity 3, a temperature control piece 5, a standard piece 6 and a measuring piece 7 are respectively connected in the constant temperature cylinder 4, the lower end of the constant temperature cylinder 4 penetrates through the filling port and extends into the liquid nitrogen, and the upper end of the constant temperature cylinder 4 is detachably connected with the cover body 2 through a sealing component; the sealing assembly comprises a lower sealing block 8 positioned at the bottom of the installation cavity 3, the inner side of the lower sealing block 8 is jointed with the constant temperature cylinder 4 through an inclined pressure surface 9, a limiting surface 10 matched with the cover body 2 is arranged on the outer side of the lower sealing block 8, a flexible sealing ring can be arranged on the limiting surface 10, the top of the lower sealing block 8 is connected with an upper sealing block 12 through an annular part 11 in a threaded manner, the outer part of the upper sealing block 12 is mutually jointed with the side wall of the cover body 2, a step part 121 is arranged at the lower end of the upper sealing block 12, and the lower end of the step part 121 penetrates through the annular part 11 and is jointed with the top surface of the constant temperature cylinder 4.
The bottom of the lower sealing block 8 is provided with a plurality of extrusion parts 801 around, adjacent extrusion parts 801 are separated from each other by a first groove 13, the compression surface 9 and the limiting surface 10 are respectively positioned on the inner side and the outer side of the extrusion part 801, and a second groove 14 for the extrusion part 801 to deform and open can be arranged between the extrusion part 801 and the annular part 11.
An extrusion surface attached to the pressed surface 9 is arranged on the outer side of the constant temperature cylinder 4.
A plurality of limiting plates 15 are annularly distributed at the bottom of the cover body 2, and the limiting plates 15 are respectively located in the first grooves 13 between the extrusion parts 801.
The constant temperature section of thick bamboo 4 includes urceolus and inner tube, forms the vacuum district between urceolus and the inner tube, and the top of urceolus and inner tube is through a plurality of sleeve pipes 16 interconnect, temperature control spare 5, standard part 6 and survey piece 7 set up respectively in a plurality of sleeve pipes 16, and wherein temperature control spare 5 optional heating pipe, standard part 6 are the temperature sensor who accords with the requirement, and survey piece 7 is for being used for measuring its temperature sensor who detects the degree of accuracy, and temperature control spare 5, standard part 6 and survey piece 7's lower extreme extends to the inner tube, and temperature control spare 5, standard part 6 and survey piece 7's upper end passes constant temperature section of thick bamboo 4 in proper order and extends to the sealing component outside.
The upper sealing block 12 is provided with a plurality of mounting holes 17 matched with the temperature control piece 5, the standard piece 6 and the measuring piece 7, a supporting sleeve 18 is connected in the mounting holes 17, the lower end of the supporting sleeve 18 penetrates through the mounting holes 17 and extends into the sleeve 16, and the supporting sleeve 18 can be fixed on the mounting holes 17 in a threaded connection or interference fit insertion mode to prevent the supporting sleeve from falling off in use.
The top of the supporting sleeve 18 is provided with a locking member for fixing the temperature control member 5, the standard member 6 or the measuring member 7, and the locking member can be a locking structure which is used for limiting the height of the cylindrical structure by using a flexible rubber sleeve, a conical nut and the like.
A gap is reserved between the side wall of the cover body 2 and the inner wall of the filling opening, and a plurality of openings for discharging nitrogen are formed in the top of the cover body 2.
The working principle of the invention is as follows: when the invention is installed, an operator firstly places the lower sealing block 8 at the bottom of the installation cavity 3, and the first groove 13 and the limiting plate 15 are mutually buckled; the evacuated constant temperature cylinder 4 is then inserted into the dewar 1 from the mounting cavity 3 and the constant temperature cylinder 4 is supported by the cooperation of the compression surface 9 and the extrusion surface. After the constant temperature cylinder 4 is inserted, an operator screws the upper sealing block 12 into the annular part 11 at the upper end of the lower sealing block 8, and makes the upper sealing block 12 apply downward extrusion force to the constant temperature cylinder 4 after screwing in, so that the constant temperature cylinder 4 is subjected to the cooperation of the pressing surface 9 and the pressing surface to extrude the surrounding extrusion part 801 outwards under the action of the extrusion force, and the extrusion part 801 is mutually attached with the side wall of the cover body 2 under the extrusion action to realize friction limit.
After the upper sealing block 12 is screwed in, an operator aligns the sleeves 16 and the mounting holes 17 with each other and inserts the supporting sleeve 18 with the sleeves, so that the supporting sleeve 18 can limit the circumferential positions of the upper sealing block 12 and the mounting cavity 3 with each other after the supporting sleeve 18 is inserted; in this state, when the upper seal block 12 is to be unscrewed, the friction between the constant temperature cylinder 4 and the lower seal block 8 needs to be overcome, and the constant temperature cylinder 7 and the seal assembly are limited by the friction, so that the loosening and the falling off of the cover body 2 are prevented. When the subsequent disassembly is performed, an operator only needs to pull out each supporting sleeve 18, so that the upper sealing block 12 can be independently screwed out, and then the constant temperature cylinder 4 is directly pulled out, thereby facilitating the later disassembly and assembly of the operator.
When the temperature control device is used, liquid nitrogen around the constant temperature cylinder 4 can cool the constant temperature cylinder 4, and meanwhile, the temperature control part 5 in the constant temperature cylinder 4 is used for heating the constant temperature cylinder 4, so that the temperature in the inner cylinder can be maintained within a certain temperature value under the cooperation of the constant temperature cylinder and the constant temperature cylinder, and the temperature accuracy detection of the measuring part 7 within the range of-80 ℃ to-196 ℃ is realized. At this time, the measuring piece 7 to be detected is inserted into the constant temperature cylinder 4 through the supporting sleeve 18, the temperature of the inner cylinder is detected, and meanwhile, the detection result of the measuring piece 7 is compared with the detection result of the standard piece 6, so that whether the detecting piece 7 has a detection error is judged.
Claims (8)
1. A constant temperature liquid nitrogen detector, characterized in that: the device comprises a Dewar tank (1), wherein liquid nitrogen is filled in the Dewar tank (1), a filling opening is formed in the top of the Dewar tank (1), a cover body (2) is fixedly connected to the filling opening, an inwards-sunken mounting cavity (3) is formed in the middle of the cover body (2), a constant temperature barrel (4) is arranged in the mounting cavity (3), a temperature control piece (5), a standard piece (6) and a measuring piece (7) are respectively connected to the constant temperature barrel (4), the lower end of the constant temperature barrel (4) penetrates through the filling opening and extends into the liquid nitrogen, and the upper end of the constant temperature barrel (4) is detachably connected with the cover body (2) through a sealing component; the sealing assembly comprises a lower sealing block (8) positioned at the bottom of the installation cavity (3), wherein the inner side of the lower sealing block (8) is attached to the constant temperature cylinder (4) through an inclined pressure surface (9), a limiting surface (10) matched with the cover body (2) is arranged on the outer side of the lower sealing block (8), an upper sealing block (12) is connected to the top of the lower sealing block (8) through an annular part (11) in a threaded manner, a step part (121) is arranged at the lower end of the upper sealing block (12), and the lower end of the step part (121) penetrates through the annular part (11) and is attached to the top surface of the constant temperature cylinder (4).
2. A liquid nitrogen thermostatted assay according to claim 1 wherein: the bottom of lower sealing piece (8) is equipped with a plurality of extrusion portion (801) all around, separates each other through first recess (13) between adjacent extrusion portion (801), pressurized face (9) and spacing face (10) are located the inside and outside both sides of extrusion portion (801) respectively.
3. A liquid nitrogen thermostatted assay according to claim 2, wherein: the outer side of the constant temperature cylinder (4) is provided with an extrusion surface which is attached to the pressed surface (9).
4. A liquid nitrogen thermostatted assay according to claim 2, wherein: the bottom of the cover body (2) is annularly provided with a plurality of limiting plates (15), and the limiting plates (15) are respectively positioned in the first grooves (13) between the extrusion parts (801).
5. A liquid nitrogen thermostatted assay according to claim 1 wherein: the constant temperature section of thick bamboo (4) include urceolus and inner tube, form the vacuum district between urceolus and the inner tube, the top of urceolus and inner tube is through a plurality of sleeve pipes (16) interconnect, temperature control spare (5), standard part (6) and survey piece (7) set up respectively in a plurality of sleeve pipes (16), and the lower extreme of temperature control spare (5), standard part (6) and survey piece (7) extends to the inner tube, and the upper end of temperature control spare (5), standard part (6) and survey piece (7) passes constant temperature section of thick bamboo (4) in proper order and extends to the sealing component outside.
6. A liquid nitrogen thermostatic tester according to claim 5, wherein: the upper sealing block (12) is provided with a plurality of mounting holes (17) matched with the temperature control piece (5), the standard piece (6) and the measuring piece (7), the mounting holes (17) are connected with a supporting sleeve (18), and the lower end of the supporting sleeve (18) penetrates through the mounting holes (17) and extends into the sleeve (16).
7. A liquid nitrogen thermostatic tester according to claim 6, wherein: the top of the supporting sleeve (18) is provided with a locking piece for fixing the temperature control piece (5), the standard piece (6) or the measuring piece (7).
8. A liquid nitrogen thermostatted assay according to claim 1 wherein: a gap is reserved between the side wall of the cover body (2) and the inner wall of the filling opening, and a plurality of openings for discharging nitrogen are formed in the top of the cover body (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310903928.XA CN117007210A (en) | 2023-07-21 | 2023-07-21 | Liquid nitrogen constant temperature detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310903928.XA CN117007210A (en) | 2023-07-21 | 2023-07-21 | Liquid nitrogen constant temperature detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117007210A true CN117007210A (en) | 2023-11-07 |
Family
ID=88572100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310903928.XA Pending CN117007210A (en) | 2023-07-21 | 2023-07-21 | Liquid nitrogen constant temperature detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117007210A (en) |
-
2023
- 2023-07-21 CN CN202310903928.XA patent/CN117007210A/en active Pending
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