CN117073854A - Temperature sensor and method for manufacturing temperature sensor - Google Patents
Temperature sensor and method for manufacturing temperature sensor Download PDFInfo
- Publication number
- CN117073854A CN117073854A CN202210497893.XA CN202210497893A CN117073854A CN 117073854 A CN117073854 A CN 117073854A CN 202210497893 A CN202210497893 A CN 202210497893A CN 117073854 A CN117073854 A CN 117073854A
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- China
- Prior art keywords
- insulator
- temperature sensor
- cable
- end cap
- sensor element
- 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
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title abstract description 3
- 239000012212 insulator Substances 0.000 claims abstract description 110
- 238000002347 injection Methods 0.000 claims abstract description 34
- 239000007924 injection Substances 0.000 claims abstract description 34
- 239000000565 sealant Substances 0.000 claims abstract description 25
- 239000011248 coating agent Substances 0.000 claims abstract description 18
- 238000000576 coating method Methods 0.000 claims abstract description 18
- 238000007789 sealing Methods 0.000 claims abstract description 14
- 239000003292 glue Substances 0.000 claims abstract description 11
- 239000011247 coating layer Substances 0.000 claims abstract description 8
- 238000001746 injection moulding Methods 0.000 claims description 17
- 239000012778 molding material Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims 1
- 229920000647 polyepoxide Polymers 0.000 claims 1
- 239000002184 metal Substances 0.000 abstract description 7
- 239000004593 Epoxy Substances 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- GHYOCDFICYLMRF-UTIIJYGPSA-N (2S,3R)-N-[(2S)-3-(cyclopenten-1-yl)-1-[(2R)-2-methyloxiran-2-yl]-1-oxopropan-2-yl]-3-hydroxy-3-(4-methoxyphenyl)-2-[[(2S)-2-[(2-morpholin-4-ylacetyl)amino]propanoyl]amino]propanamide Chemical compound C1(=CCCC1)C[C@@H](C(=O)[C@@]1(OC1)C)NC([C@H]([C@@H](C1=CC=C(C=C1)OC)O)NC([C@H](C)NC(CN1CCOCC1)=O)=O)=O GHYOCDFICYLMRF-UTIIJYGPSA-N 0.000 description 1
- 229940125797 compound 12 Drugs 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
Classifications
-
- 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
- G01K1/16—Special arrangements for conducting heat from the object to the sensitive element
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses a temperature sensor and a method for manufacturing the same. The temperature sensor includes: a sensing element; a cable, wherein a core wire at one end of the cable is exposed from an outer coating layer of the cable and is electrically connected with the sensing element; and an insulator wrapped around the outer coating and the exposed core wire at one end of the cable. The insulator is provided with a first end positioned at the sensing element, a glue injection cavity is formed between the first end of the insulator and the sensing element, and sealant is injected into the glue injection cavity so as to realize sealing between the insulator and the sensing element. According to the invention, the exposed core wire of the cable is not required to be sealed by adopting the metal shell, so that the time response of the temperature sensor is very fast, and the volume of the temperature sensor can be reduced.
Description
Technical Field
The present invention relates to a temperature sensor and a method of manufacturing a temperature sensor.
Background
In the prior art, temperature sensors typically include a sensing element and a cable. The exposed core wire of the cable is electrically connected with the sensing element. In the prior art, the exposed core of the sensing element and the cable typically need to be sealed in a metal housing. In order to achieve a reliable seal, the exposed core wires of the sensor element and the cable are typically coated with a coating and a sealing compound is poured into the gap between the coating and the metal jacket.
For existing temperature sensors, external heat is conducted to the inner sealant through the metal housing, then from the sealant to the cladding, and finally from the cladding to the sensing element. This results in a long time for external heat to be conducted to the sensing element, which makes the temperature response of the temperature sensor very slow, and the metal housing results in a large volume of the temperature sensor.
Disclosure of Invention
The present invention is directed to solving at least one of the above-mentioned problems and disadvantages of the prior art.
According to one aspect of the present invention, there is provided a temperature sensor comprising: a sensing element; a cable, wherein a core wire at one end of the cable is exposed from an outer coating layer of the cable and is electrically connected with the sensing element; and an insulator wrapped around the outer coating and the exposed core wire at one end of the cable. The insulator is provided with a first end positioned at the sensing element, a glue injection cavity is formed between the first end of the insulator and the sensing element, and sealant is injected into the glue injection cavity so as to realize sealing between the insulator and the sensing element.
According to an exemplary embodiment of the present invention, a portion of the sensing element is exposed from the first end of the insulator and the sealant to shorten the temperature response time of the sensing element.
According to another exemplary embodiment of the present invention, the insulator is an integral injection molded part.
According to another exemplary embodiment of the present invention, the insulator further has a second end sealingly wrapped over the outer coating of one end of the cable to achieve a seal between the insulator and the cable.
According to another exemplary embodiment of the invention, the second end of the insulator is heat welded with an outer coating of one end of the cable to achieve a seal between the insulator and the cable.
According to another exemplary embodiment of the present invention, the insulator extends continuously between the first end and the second end such that the exposed core wire of one end of the cable is completely enclosed in the insulator in a sealed manner.
According to another exemplary embodiment of the present invention, the insulator has a protruding ring protruding from an outer surface thereof for mounting the temperature sensor to a device under test.
According to another exemplary embodiment of the present invention, the raised ring is flanged and is adjacent to the second end of the insulator.
According to another exemplary embodiment of the present invention, the sealant is an epoxy sealant.
According to another exemplary embodiment of the present invention, the sensing element is a thermistor.
According to another exemplary embodiment of the present invention, the core wire of the cable is welded to the sensing element.
According to another exemplary embodiment of the present invention, the insulator serves as a housing of the temperature sensor.
According to another aspect of the present invention, there is provided a method of manufacturing a temperature sensor, comprising the steps of:
s10: providing a sensing element and a cable, wherein a core wire at one end of the cable is exposed out of an outer coating layer of the cable and is electrically connected with the sensing element;
s20: providing an end cap and fitting said end cap over said sensing element;
s30: forming an insulator on one end of the cable by an insert injection molding process, the insulator being wrapped around a portion of the end cap and an outer cover and an exposed core wire of one end of the cable;
s40: removing the end cap from the sensing element to form an injection cavity between the insulator and the sensing element; and
s50: and filling sealant into the sealant injection cavity to realize sealing between the insulator and the sensing element.
According to an exemplary embodiment of the present invention, in the step S40, the end cap is pulled out from the sensing element by grasping an exposed portion of the end cap not covered by the insulator.
According to another exemplary embodiment of the invention, the end cap has smooth inner and outer surfaces to reduce extraction forces when the end cap is removed.
According to another exemplary embodiment of the invention, the end cap is capable of withstanding the injection molding temperature at which the insulator is injection molded, such that the end cap does not melt at the time of injection molding the insulator.
According to another exemplary embodiment of the present invention, the end cap is made of a material that is not thermally bondable to an injection molding material of the insulator to prevent the end cap from thermally bonding with the insulator when the insulator is injection molded.
According to another exemplary embodiment of the present invention, the end cap is tightly fitted with the sensing element to prevent injection molding material from flowing between the end cap and the sensing element when the insulator is injection molded.
According to another exemplary embodiment of the present invention, the insulator is heat welded with an outer coating layer of one end of the cable to achieve sealing between the insulator and the cable when the insulator is injection-molded.
According to another exemplary embodiment of the present invention, the insulator serves as a housing of the temperature sensor.
In the foregoing various exemplary embodiments according to this invention, an insulator is formed over the exposed core of the cable and a potting seal is employed between the end of the insulator and the sensing element such that the exposed core of the cable is sealed in the insulator. Therefore, the invention does not need to adopt a metal shell to seal the exposed core wire of the cable, so that the time response of the temperature sensor is very fast, and the volume of the temperature sensor can be reduced.
Other objects and advantages of the present invention will become apparent from the following description of the invention with reference to the accompanying drawings, which provide a thorough understanding of the present invention.
Drawings
FIG. 1 shows a schematic view of sensing elements and cables of a temperature sensor according to an exemplary embodiment of the invention;
FIG. 2 shows a schematic view of an end cap fitted over the sensing element of the temperature sensor of FIG. 1;
FIG. 3 shows a schematic view of an exposed core injection molded insulator of the cable of the temperature sensor shown in FIG. 2;
FIG. 4 shows a schematic view of the temperature sensor of FIG. 3 after removal of the end cap from the sensing element;
fig. 5 shows a schematic diagram of the injection of sealant in the sealant cavity between the insulator and the sensing element of the temperature sensor shown in fig. 4.
Detailed Description
The technical scheme of the invention is further specifically described below through examples and with reference to the accompanying drawings. In the specification, the same or similar reference numerals denote the same or similar components. The following description of embodiments of the present invention with reference to the accompanying drawings is intended to illustrate the general inventive concept and should not be taken as limiting the invention.
Furthermore, in the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in the drawings in order to simplify the drawings.
According to one general technical concept of the present invention, there is provided a temperature sensor including: a sensing element; a cable, wherein a core wire at one end of the cable is exposed from an outer coating layer of the cable and is electrically connected with the sensing element; and an insulator wrapped around the outer coating and the exposed core wire at one end of the cable. The insulator is provided with a first end positioned at the sensing element, a glue injection cavity is formed between the first end of the insulator and the sensing element, and sealant is injected into the glue injection cavity so as to realize sealing between the insulator and the sensing element.
According to another general technical concept of the present invention, there is provided a manufacturing method of a temperature sensor, including: providing a sensing element and a cable, wherein a core wire at one end of the cable is exposed out of an outer coating layer of the cable and is electrically connected with the sensing element; providing an end cap and fitting said end cap over said sensing element; forming an insulator on one end of the cable by an insert injection molding process, the insulator being wrapped around a portion of the end cap and an outer cover and an exposed core wire of one end of the cable; removing the end cap from the sensing element to form an injection cavity between the insulator and the sensing element; and pouring sealant into the glue injection cavity to realize sealing between the insulator and the sensing element.
Fig. 1 shows a schematic view of a sensing element 1 and a cable 2 of a temperature sensor according to an exemplary embodiment of the invention; fig. 2 shows a schematic view of an end cap 10 fitted over the sensor element 1 of the temperature sensor shown in fig. 1; FIG. 3 shows a schematic view of an exposed core injection molded insulator of the cable of the temperature sensor shown in FIG. 2; fig. 4 shows a schematic view of the temperature sensor of fig. 3 after removal of the end cap 10 from the sensor element 1; fig. 5 shows a schematic illustration of the filling of the glue injection cavity 11 between the insulator 3 and the sensor element 1 of the temperature sensor shown in fig. 4 with a sealing compound 12.
As shown in fig. 1 to 5, in the illustrated embodiment, the temperature sensor includes: a sensor element 1, a cable 2 and an insulator 3. The cable 2 includes two core wires 21 and an outer coating layer 22 that is wrapped around the two core wires 21. The core wire 21 at one end of the cable 2 is exposed from the outer coating 22 of the cable 2 and electrically connected to the sensor element 1. The insulator 3 is wrapped around the outer coating 22 and the exposed core wire 21 at one end of the cable 2.
As shown in fig. 1 to 5, in the illustrated embodiment, the insulator 3 has a first end 31 at the sensor element 1. A glue injection cavity 11 is formed between the first end 31 of the insulator 3 and the sensor element 1, and a sealant 12 is injected into the glue injection cavity 11 to seal between the insulator 3 and the sensor element 1. In this way, the exposed core wire 21 of the cable 2 can be sealed in the insulator 3.
As shown in fig. 1 to 5, in the illustrated embodiment, a portion of the sensing element 1 is exposed from the first end 31 of the insulator 3 and the sealant 12, so that the temperature response time of the sensing element 1 can be shortened, making the temperature response of the temperature sensor faster.
As shown in fig. 1 to 5, in the illustrated embodiment, the insulator 3 is an integral injection molded part. This can reduce the manufacturing cost and can improve the sealing performance.
As shown in fig. 1-5, in the illustrated embodiment, the insulator 3 also has a second end 32 sealingly wrapped over the outer covering 22 at one end of the cable 2 to effect a seal between the insulator 3 and the cable 2.
As shown in fig. 1-5, in the illustrated embodiment, the second end 32 of the insulator 3 is heat fused with the outer cover 22 of one end of the cable 2 to effect a seal between the insulator 3 and the cable 2.
As shown in fig. 1-5, in the illustrated embodiment, the insulator 3 extends continuously between the first end 31 and the second end 32 such that the exposed core 21 of one end of the cable 2 is completely hermetically encased in the insulator 3.
As shown in fig. 1 to 5, in the illustrated embodiment, the insulator 3 has a protruding ring 33 protruding from its outer surface for mounting the temperature sensor to a device to be detected (not shown). The raised ring 33 is flanged and is adjacent the second end 32 of the insulator 3.
As shown in fig. 1-5, in the illustrated embodiment, the sealant 12 is an epoxy sealant. However, the present invention is not limited to the illustrated embodiment, and other suitable sealants, such as silicone, may be used for the sealant 12.
As shown in fig. 1 to 5, in the illustrated embodiment, the sensor element 1 is a thermistor. For example, the sensing element 1 may be a negative temperature coefficient thermistor or a positive temperature coefficient thermistor.
As shown in fig. 1 to 5, in the illustrated embodiment, the core wire 21 of the cable 2 is soldered to the sensor element 1 to be electrically connected with the sensor element 1.
As shown in fig. 1 to 5, in the illustrated embodiment, the insulator 3 serves as a housing of the temperature sensor. In this way, there is no need to provide a metal housing for sealing, so that the temperature response time of the temperature sensor can be reduced, making the temperature response of the temperature sensor very fast.
A method of manufacturing a temperature sensor according to an exemplary embodiment of the present invention, which mainly includes the steps of:
s10: as shown in fig. 1, a sensor element 1 and a cable 2 are provided, and a core wire 21 of one end of the cable 2 is exposed from an outer coating 22 of the cable 2 and electrically connected to the sensor element 1;
s20: as shown in fig. 2, an end cap 10 is provided and the end cap 10 is fitted over the sensor element 1;
s30: as shown in fig. 3, an insulator 3 is formed on one end of the cable 2 by an insert injection molding process, and the insulator 3 is wrapped around a portion of the end cap 10 and the outer coating 22 and the exposed core wire 21 of one end of the cable 2;
s40: as shown in fig. 4, the end cap 10 is removed from the sensor element 1 to form an injection cavity 11 between the insulator 3 and the sensor element 1; and
s50: as shown in fig. 5, a sealant 12 is poured into the glue-pouring cavity 11 to achieve sealing between the insulator 3 and the sensor element 1.
Thus, a temperature sensor as shown in fig. 5 can be manufactured.
As shown in fig. 1 to 5, in an exemplary embodiment of the present invention, in step S40, the end cap 10 may be pulled out from the sensor element 1 by grasping an exposed portion of the end cap 10 not covered by the insulator 3.
As shown in fig. 1-5, in one exemplary embodiment of the invention, the end cap 10 has smooth inner and outer surfaces to reduce pullout forces when the end cap 10 is removed.
As shown in fig. 1-5, in one exemplary embodiment of the invention, the end cap 10 is capable of withstanding the injection molding temperature at which the insulator 3 is injection molded such that the end cap 10 does not melt at the time of injection molding the insulator 3.
As shown in fig. 1 to 5, in an exemplary embodiment of the present invention, the end cap 10 is made of a material that cannot be thermally bonded to the injection molding material of the injection molded insulator 3, so as to prevent the end cap 10 from being thermally bonded to the insulator 3 when the insulator 3 is injection molded.
As shown in fig. 1-5, in one exemplary embodiment of the invention, the end cap 10 is a close fit with the sensing element 1 to prevent injection molding material from flowing between the end cap 10 and the sensing element 1 when the insulator 3 is injection molded.
As shown in fig. 1 to 5, in an exemplary embodiment of the present invention, when the insulator 3 is injection molded, the insulator 3 is thermally welded with the outer coating 22 of one end of the cable 2 to achieve sealing between the insulator 3 and the cable 2.
It will be appreciated by those skilled in the art that the above-described embodiments are exemplary and that modifications may be made to the embodiments described in various embodiments without structural or conceptual aspects and that these variations may be resorted to without departing from the scope of the invention.
Although the present invention has been described with reference to the accompanying drawings, the examples disclosed in the drawings are intended to illustrate preferred embodiments of the invention and are not to be construed as limiting the invention.
Although a few embodiments of the present general inventive concept have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the claims and their equivalents.
It should be noted that the word "comprising" does not exclude other elements or steps, and that the word "a" or "an" does not exclude a plurality. In addition, any element numbers of the claims should not be construed as limiting the scope of the invention.
Claims (20)
1. A temperature sensor, comprising:
a sensor element (1);
a cable (2) in which a core wire (21) at one end is exposed from an outer coating layer (22) of the cable (2) and is electrically connected to the sensor element (1); and
an insulator (3) which is wrapped around an outer coating (22) and an exposed core wire (21) at one end of the cable (2),
the insulator (3) has a first end (31) at the sensor element (1), an injection cavity (11) is formed between the first end (31) of the insulator (3) and the sensor element (1), and a sealant (12) is injected into the injection cavity (11) to seal between the insulator (3) and the sensor element (1).
2. A temperature sensor according to claim 1, characterized in that:
a portion of the sensor element (1) is exposed from the first end (31) of the insulator (3) and the sealant (12) to shorten the temperature response time of the sensor element (1).
3. A temperature sensor according to claim 1, characterized in that: the insulator (3) is an integral injection molding piece.
4. A temperature sensor according to claim 1, characterized in that:
the insulator (3) also has a second end (32) sealingly wrapped over the outer coating (22) at one end of the cable (2) to effect a seal between the insulator (3) and the cable (2).
5. The temperature sensor of claim 4, wherein:
the second end (32) of the insulator (3) is heat welded to the outer coating (22) of one end of the cable (2) to achieve a seal between the insulator (3) and the cable (2).
6. The temperature sensor of claim 4, wherein:
the insulator (3) extends continuously between the first end (31) and the second end (32) such that the exposed core wire (21) of one end of the cable (2) is completely enclosed in the insulator (3).
7. The temperature sensor of claim 4, wherein:
the insulator (3) has a raised ring (33) protruding from its outer surface for mounting the temperature sensor to a device under test.
8. The temperature sensor of claim 7, wherein: the raised ring (33) is flanged and is adjacent to the second end (32) of the insulator (3).
9. A temperature sensor according to claim 1, characterized in that: the sealant (12) is an epoxy resin sealant.
10. A temperature sensor according to claim 1, characterized in that: the sensor element (1) is a thermistor.
11. A temperature sensor according to claim 1, characterized in that: a core wire (21) of the cable (2) is welded to the sensor element (1).
12. A temperature sensor according to any one of claims 1-11, characterized in that: the insulator (3) serves as a housing for the temperature sensor.
13. A method of manufacturing a temperature sensor, comprising the steps of:
s10: providing a sensing element (1) and a cable (2), wherein a core wire (21) at one end of the cable (2) is exposed from an outer coating (22) of the cable (2) and is electrically connected with the sensing element (1);
s20: providing an end cap (10) and fitting the end cap (10) over the sensor element (1);
s30: forming an insulator (3) on one end of the cable (2) by an insert injection molding process, the insulator (3) being wrapped over a portion of the end cap (10) and an outer coating (22) and an exposed core wire (21) of one end of the cable (2);
s40: -removing the end cap (10) from the sensor element (1) to form an injection cavity (11) between the insulator (3) and the sensor element (1); and
s50: a sealant (12) is poured into the glue injection cavity (11) to realize sealing between the insulator (3) and the sensing element (1).
14. The method of manufacturing a temperature sensor according to claim 13, wherein:
in step S40, the end cap (10) is pulled off the sensor element (1) by gripping the exposed part of the end cap (10) not covered by the insulator (3).
15. The method of manufacturing a temperature sensor according to claim 14, wherein:
the end cap (10) has smooth inner and outer surfaces to reduce pullout forces when the end cap (10) is removed.
16. The method of manufacturing a temperature sensor according to claim 13, wherein:
the end cap (10) is able to withstand the injection molding temperature at which the insulator (3) is injection molded, so that the end cap (10) does not melt at the time of injection molding the insulator (3).
17. The method of manufacturing a temperature sensor according to claim 16, wherein:
the end cap (10) is made of a material that is not thermally bondable to the injection molding material of the insulator (3) to prevent the end cap (10) from being thermally bonded to the insulator (3) when the insulator (3) is injection molded.
18. The method of manufacturing a temperature sensor according to claim 13, wherein:
the end cap (10) is in close fit with the sensor element (1) to prevent injection moulding material from flowing between the end cap (10) and the sensor element (1) when the insulator (3) is injection moulded.
19. The method of manufacturing a temperature sensor according to claim 13, wherein:
when the insulator (3) is injection-molded, the insulator (3) and an outer coating (22) at one end of the cable (2) are thermally welded together to realize sealing between the insulator (3) and the cable (2).
20. The method of manufacturing a temperature sensor according to claim 13, wherein:
the insulator (3) serves as a housing for the temperature sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210497893.XA CN117073854A (en) | 2022-05-09 | 2022-05-09 | Temperature sensor and method for manufacturing temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210497893.XA CN117073854A (en) | 2022-05-09 | 2022-05-09 | Temperature sensor and method for manufacturing temperature sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117073854A true CN117073854A (en) | 2023-11-17 |
Family
ID=88718057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210497893.XA Pending CN117073854A (en) | 2022-05-09 | 2022-05-09 | Temperature sensor and method for manufacturing temperature sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117073854A (en) |
-
2022
- 2022-05-09 CN CN202210497893.XA patent/CN117073854A/en active Pending
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