CN219608822U

CN219608822U - Point heat source method liquid heat conductivity coefficient measuring device

Info

Publication number: CN219608822U
Application number: CN202320069770.6U
Authority: CN
Inventors: 周逸; 潘永杲; 闵琪涛; 李峻
Original assignee: Changzhou Examination Detection Standard Authentication Research Institute
Current assignee: Changzhou Examination Detection Standard Authentication Research Institute
Priority date: 2023-01-10
Filing date: 2023-01-10
Publication date: 2023-08-29
Anticipated expiration: 2033-01-10

Abstract

The utility model provides a device for measuring the heat conductivity coefficient of liquid by a point heat source method, which comprises a horizontal constant temperature tank, a liquid storage tank and a liquid storage tank, wherein the horizontal constant temperature tank is used for placing a beaker, and keeping constant temperature; the sensor fixing frame is arranged on the side edge of the horizontal constant temperature tank and used for fixing the point heat source sensor, so that the detection end of the point heat source sensor is positioned at a test point position in the beaker; the point heat source sensor comprises a shell, a thermistor is arranged at the end part of the shell and used for detecting liquid to be detected in the beaker, and a detection signal output end of the point heat source sensor is connected with a signal input end of the host. The measuring device can fix the thermistor at the center of the beaker through the sensor shell, ensures the measuring accuracy, and is suitable for the rapid measurement of the liquid heat conductivity coefficient and the preservation of the sensor when the sensor does not measure.

Description

Point heat source method liquid heat conductivity coefficient measuring device

Technical Field

The utility model relates to the field of thermophysical property measurement, in particular to a device for measuring the heat conductivity coefficient of liquid by a point heat source method.

Background

With the rapid development of electronic devices and chip technologies, the demand for heat dissipation capability of materials is higher and higher, and novel materials with higher heat dissipation capability such as graphene, boron nitride and the like become hot spots of current research, wherein the application of high heat dissipation coating and high heat conduction paste can effectively improve the heat dissipation capability of electronic devices and improve the comprehensive performance. At present, a plurality of methods and instruments for measuring the heat conductivity coefficient of solid materials at home and abroad are available, the instruments for measuring the heat conductivity coefficient of materials such as liquid, paste and the like are few, and meanwhile, the measuring performance of the existing instruments is uneven, particularly, the fish eyes of domestic equipment are mixed, so that the purported measuring accuracy cannot be achieved at all. Because of the lack of corresponding technical standards in China, the heat conductivity coefficient magnitude transmission/tracing system of materials such as liquid, paste and the like is not sound, so that a metering department cannot effectively evaluate the measurement result of the existing heat conductivity coefficient testing instrument, and the heat conductivity coefficient claimed by products measured by using the instruments is not well accepted by enterprises.

The development of the measurement of the heat conductivity coefficient of the liquid in China relatively falls behind abroad, in 1989, huang Shaolie and the like, a linear probe method is proposed to measure the heat conductivity coefficient of the liquid on the basis of a hot wire method, and the relative deviation between the corrected liquid and a reference is less than +/-3 percent; xu Jiang and the like, a transient double-hot wire liquid heat conductivity coefficient measuring instrument is researched and designed, deionized water is adopted to calibrate the device, and the corrected measuring error is less than 0.9%; wang Zhaoliang and the like measure the heat conductivity of the liquid based on a 3 omega method and analyze influence factors, which indicates that the method can effectively measure the heat conductivity of the liquid after correction; the method of liquid heat conductivity coefficient is researched by Shanghai silicate institute, harbin university of industry and Western An traffic university of China academy of sciences, a measuring device is developed and corresponding patent is applied, commercial equipment is available in Hunan Xiang instrument, inc. and XAnxia electronic technology, inc. in China, and other devices are laboratory devices.

The measurement method aiming at the thermal conductivity of the liquid is researched, the corresponding measurement device is developed, the measurement standard and specification and the calibration method aiming at the tester are formulated, and the magnitude transmission/tracing system of the thermal conductivity of the liquid material can be further improved.

Disclosure of Invention

The utility model aims to solve the problems that the liquid heat conductivity coefficient measuring device in the market is single and few instruments can be selected at present, and provides the liquid heat conductivity coefficient measuring device by a point heat source method.

The technical scheme of the utility model is as follows:

a point heat source method liquid heat conductivity coefficient measuring device includes:

the horizontal constant temperature tank is used for placing a beaker and keeping constant temperature, and the beaker is used for placing liquid to be measured;

the sensor fixing frame is arranged on the side edge of the horizontal constant temperature tank and used for fixing the point heat source sensor, so that the detection end of the point heat source sensor is positioned at a test point position in the beaker;

the point heat source sensor comprises a shell, wherein a thermistor is arranged at the end part of the shell and used for detecting liquid to be detected in the beaker, and a detection signal output end of the point heat source sensor is connected with a signal input end of a host.

Further, the horizontal constant temperature tank adopts diluted glycol antifreeze as a temperature control medium solution, and the diameter of an opening of a working area of the horizontal constant temperature tank is 100mm; the distance between the groove bottom and the upper surface of the opening of the working area is 140mm.

Further, the sensor fixing frame comprises a fixing support, a clamp is arranged at the end part of the fixing support and used for vertically fixing the sensor, and tightness is adjusted through a first knob.

Further, be equipped with beaker fixed knot in the horizontal constant temperature tank and construct, include: the fixing block is arranged on the metal plate beside the opening of the working area of the horizontal constant temperature tank, the fastening ring is arranged on the fixing block and is adjustable in tightness, and the end part of the beaker is contained in the fastening ring and is fixed through the second knob.

Further, the beaker fixing structure also comprises a heightening metal block and a beaker limiting device, wherein the heightening metal block is placed at the bottom of the groove below the opening of the working area of the horizontal constant temperature tank, and the beaker limiting device is fixed on the heightening metal block and used for limiting the beaker.

Further, the length, width and height of the heightening metal block are 80mm, 60mm and 30mm respectively, the beaker limiting device is an upper ring and a lower ring with the diameter of 68mm, and the two rings are welded through two vertical rods and are used for limiting the placing position of the beaker.

Further, the sensor fixing frame comprises a base, a cross rod, a vertical rod, a sliding block cross rod knob and a vertical rod knob, wherein the bottom of the vertical rod is arranged on the base, the vertical rod and the cross rod are inserted into the sliding block, and the cross rod is enabled to move and lock at the height, front and back positions by adjusting the vertical rod knob and the cross rod knob on the sliding block.

Further, the shell comprises a head sealing cover, a head limiting and fixing section, an external thread limiting section, a limiting disc, a long barrel rod and a lead-out wire;

the two pins of the thermistor are respectively divided through two holes on the head sealing cover, the front end of the head limiting and fixing section is connected with the head sealing cover, and the rear end of the head limiting and fixing section is connected with the front end of the external thread limiting section; the limiting disc is sleeved on the external thread limiting section and can be used for adjusting the position, and the periphery of the limiting disc is sleeved with a rubber ring for ensuring that the thermistor is positioned at the center of the beaker; the rear end of the external thread limiting section is connected with the front end of the long cylinder rod, the rear end of the long cylinder rod is connected with an outgoing wire through a fixed locking head, the outgoing wire is four-core, every two cores are connected with a thermistor pin through an outgoing wire in the shell, and the outgoing wire is connected to a sensor interface of a host.

Further, the limiting disc is provided with air holes distributed in an array.

Further, the point heat source sensor is provided with a protective cover, a sensor protective cover inner fixing groove is formed in the protective cover, a sensor head limiting fixing protrusion is arranged on the head limiting fixing section, and the sensor head limiting fixing protrusion is matched with the sensor protective cover inner fixing groove.

The utility model has the beneficial effects that:

according to the sensor, the sensor shell is vertically fixed through the clamp on the fixing support, the tightness is adjustable, and the thermistor at the front end of the shell is ensured to be positioned at the center of the beaker; the beaker is fixed on the metal plate beside the opening of the working area of the horizontal constant temperature tank through the fixing block, and is fixed through the fastening ring and the second knob, so that toppling and shaking are prevented, and the accuracy and stability of detection are effectively ensured.

The host computer is connected with the lead-out wire of the sensor shell, the liquid in the beaker is heated by applying a current of 0.5-2 mA for 1-3 s to the thermistor as a point heat source, and the thermal conductivity coefficient of the measured liquid can be obtained by measuring the change of the electric potential on the thermistor.

The periphery of the limiting disc is sleeved with the rubber ring with the diameter of 4mm, when the spot heat source sensor is placed in the beaker, the limiting disc sleeved with the rubber ring plays a role in fixing the position of the thermistor, so that the thermistor is positioned at the central position of the beaker and does not shake; when the measurement is not carried out, the thermistor is taken out from the beaker, the limiting disc is taken down from the external thread limiting section, the protecting cover is sleeved on the head limiting fixing section of the sensor shell, and the inner fixing groove of the sensor protecting cover and the head limiting fixing protrusion of the sensor are mutually buckled to protect the thermistor.

Additional features and advantages of the utility model will be set forth in the detailed description which follows.

Drawings

The foregoing and other objects, features and advantages of the utility model will be apparent from the following more particular descriptions of exemplary embodiments of the utility model as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the utility model.

Fig. 1 is a schematic view of the overall apparatus of the present utility model.

FIG. 2 is a schematic view of a sensor holder according to the present utility model.

Fig. 3 is a test state structure diagram of the spot heat source sensor housing of the present utility model.

Fig. 4 is a schematic view of the preservation state of the spot heat source sensor of the present utility model.

In the figure: 1. a horizontal constant temperature tank; 2. a housing; 3. a fixed bracket; 4. a clamp; 5. a first knob; 6. raising the metal block; 7. a thermistor; 8. beaker limiting device; 9. a beaker; 10. a fixed block; 11. a fastening ring; 12. a second knob; 13. and a host.

201. A base; 202. a cross bar; 203. a vertical rod; 204. a slide block; 205. a cross bar knob; 206. a vertical rod knob;

301. a head sealing cover; 302. a head limiting and fixing section; 303. an external thread limit section; 304. a limit disc; 305. ventilation holes; 306. a rubber band; 307. a long barrel rod; 308. fixing the locking head; 309. and leading out the lead.

401. An inner view structure of the long barrel rod; 402. a protective cover; 403. the sensor protection cover is internally provided with a fixed groove; 404. the sensor head is limited and fixed with a protrusion.

Detailed Description

Preferred embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model may be embodied in various forms and should not be limited to the embodiments set forth herein.

As shown in fig. 1, a point heat source liquid thermal conductivity measuring device of the present utility model includes: the device comprises a horizontal type constant temperature tank 1, a shell 2, a fixed support 3, a clamp 4, a first knob 5, a heightening metal block 6, a thermistor 7, a beaker limiting device 8, a beaker 9, a fixed block 10, a fastening ring 11, a second knob 12, a host 13 and the like.

In the embodiment, the model of the horizontal type constant temperature tank 1 is SJ-0506NH, the temperature control range is larger than (10-60) DEG C, the diluted ethylene glycol antifreeze is used as the temperature control medium solution, the distance between the tank bottom of the horizontal type constant temperature tank 1 and the upper surface of an opening of a working area is 140mm, and the diameter of the opening of the working area is 100mm; the shell 2 is vertically fixed through a clamp 4 on a fixed bracket 3 of the spot heat source sensor, and the clamp 4 is adjusted in tightness through a first knob 5; the red copper metal blocks with the length, the width and the height of 80mm, 60mm and 30mm of the heightening metal block 6 are respectively placed at the bottom of the groove below the opening of the working area of the horizontal constant temperature tank 1, and the beaker limiting device 8 is fixed on the heightening metal block 6; the beaker limiting device 8 is an upper ring and a lower ring with the diameter of 68mm, the height of the upper ring from the heightening metal block 6 is 80mm, the height of the lower ring from the heightening metal block 6 is 40mm, and the upper ring and the lower ring are fixedly connected to the heightening metal block 6 through two vertical rods in a welded mode and are used for limiting the placement position of the beaker 9.

In this embodiment, the beaker 9 is a 250mL high beaker, the outer diameter of the beaker 9 is 64mm, the height of the beaker is 130mm, the measured liquid is placed in the beaker 9, at least 250mL of measured liquid is required to be placed, the beaker 9 is placed in a beaker limiting device 8 on a heightened metal block 6, the shell 2 is placed above and fixed through a fixing bracket 3, the thermistor 7 at the front end of the shell 2 is ensured to be positioned at the center of the beaker, and the distance from the bottom of the beaker 9 is not less than 30mm; the fixing block 10 is fixed on a metal plate beside the opening of the working area of the horizontal type constant temperature tank 1, the fastening ring 11 is an adjustable fastening ring, and the beaker 9 is fixed by adjusting the second knob 12, so that the beaker 9 is prevented from toppling and shaking.

In this embodiment, the host 13 is connected to the lead-out wire of the housing 2, the resistance of the thermistor 7 is 1kΩ, the liquid in the beaker 9 is heated by applying a current of 2mA to the thermistor 7 as a point heat source, the thermal conductivity of the measured liquid can be obtained by measuring the electric potential on the thermistor 7 for a period of time generally not longer than 5s and a sampling rate of not shorter than 50 times/second, the host 13 can start measurement by one key, and the measurement result is directly displayed on the display screen of the host 13.

As shown in fig. 2, the base 201 is a cast iron base, the length, width and thickness dimensions are 200mm, 100mm and 20mm respectively, the vertical rod 203 is fixed on the base 201, the diameter is 15mm, the height is 300mm, and the fixing is performed by M8 screws; the height of the cross bar 202 can be adjusted up and down by adjusting a vertical bar knob 206 on the sliding block 204, the front and back positions of the cross bar 202 can be adjusted up and back by adjusting a cross bar knob 205 on the sliding block 204, and the cross bar 202 has a diameter of 10mm and a length of 200mm; the position of the shell 2 is adjusted by the clamp 4 at the front end of the cross bar 202, and the shell is fixed by the first knob 5, so that the thermistor 7 is ensured to be positioned at a testing point.

As shown in fig. 3, in the test state structure of the spot heat source sensor housing, the two pins of the thermistor 7 are separated by two holes on the head sealing cover 301, and are sealed by glue; the front part of the head limiting and fixing section 302 is connected with the head sealing cover 301, and the upper end of the head limiting and fixing section is connected with the external thread limiting section 303; the position of the limiting disc 304 can be adjusted in the external thread limiting section 303 through threads, the thickness of the limiting disc 304 is 3mm, and the position can be adjusted in the area of the external thread limiting section 303 through rotating the limiting disc 304; the air holes 305 are distributed on the limiting disc 304 in an array manner, and the aperture of the air holes 305 is 0.5mm; a rubber ring 306 with the diameter of 4mm is sleeved on the periphery of the rotation limiting disc 304; when the spot heat source sensor is placed in the beaker 9, the limit disc 304 sleeved with the rubber ring 306 plays a role in fixing the position of the thermistor 7, so that the thermistor 7 is ensured to be positioned at the center of the beaker 9, and the shaking condition can not occur; the long cylinder rod 307 is made of ABS, and has a diameter of 16mm and a length of 150mm; the fixed locking head 308 is a plastic waterproof fastening lock head, the diameter of the thread is 12mm, and M12×1.5; the lead-out wires 309 are lead-out wires of two pins of the thermistor 7, each pin is connected with two wires in parallel, and the four lead-out wires are connected to a sensor interface of the host 13.

As shown in fig. 4, the preservation state of the spot heat source sensor is schematically shown, the inside of the long tube rod internal viewing structure 401 is provided with a through hole, the diameter of a threaded hole at the lower end is 12mm, the diameter of an inch tap #6-40 is left-handed, the diameter of a threaded hole at the upper end is 12mm, and the diameter of a threaded hole at the upper end is M12x1.5 and is right-handed; when the measurement is not performed, the thermistor 7 is generally taken out from the beaker, the limiting disc 304 is taken down from the external thread limiting section 303, the sensor protecting cover 402 is sleeved on the head limiting fixing section 302 of the sensor shell, wherein the sensor protecting cover inner fixing groove 403 and the sensor head limiting fixing protrusion 404 are mutually buckled, so that the sensor protecting cover 402 is fixed, and the protecting effect on the thermistor 7 is realized; the sensor protection cover 402 is made of a transparent resin material, has a length of 28mm, and has an outer diameter of 14mm.

The device for measuring the liquid heat conductivity coefficient by the point heat source method can fix the thermistor at the center of the beaker by designing the point heat source shell device, ensures the measurement accuracy, and is suitable for the rapid measurement of the liquid heat conductivity coefficient and the storage of the sensor when the sensor does not measure.

The foregoing description of embodiments of the utility model has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.

Claims

1. The utility model provides a point heat source method liquid coefficient of heat conductivity measuring device which characterized in that includes:

the device comprises a horizontal constant temperature tank (1) for placing a beaker (9) and keeping constant temperature, wherein the beaker (9) is used for placing liquid to be tested;

the sensor fixing frame is arranged on the side edge of the horizontal constant temperature tank (1) and used for fixing the point heat source sensor, so that the detection end of the point heat source sensor is positioned at a test point position in the beaker (9);

the point heat source sensor comprises a shell (2), wherein a thermistor (7) is arranged at the end part of the shell (2) and used for detecting liquid to be detected in a beaker (9), and a detection signal output end of the point heat source sensor is connected with a signal input end of a host (13).

2. The device for measuring the heat conductivity coefficient of the liquid by the point heat source method according to claim 1, wherein the horizontal type constant temperature tank (1) adopts diluted glycol antifreeze solution as a temperature control medium solution, and the diameter of an opening of a working area of the horizontal type constant temperature tank (1) is 100mm; the distance between the groove bottom and the upper surface of the opening of the working area is 140mm.

3. The device for measuring the thermal conductivity coefficient of the liquid by the point heat source method according to claim 1, wherein the sensor fixing frame comprises a fixing bracket (3), a clamp (4) is arranged at the end part of the fixing bracket (3), the clamp (4) is used for vertically fixing the sensor, and the tightness is adjusted through a first knob (5).

4. The device for measuring the heat conductivity coefficient of the liquid by the point heat source method according to claim 1, wherein the horizontal constant temperature tank (1) is internally provided with a beaker fixing structure, and the device comprises: fixed block (10), clamping ring (11) and second knob (12), fixed block (10) install on the metal sheet of horizontal constant temperature tank (1) workspace opening side, clamping ring (11) install on fixed block (10) and elasticity is adjustable, the tip of beaker (9) holds in aforementioned clamping ring (11) to fix through second knob (12).

5. The device for measuring the heat conductivity coefficient of the liquid by the point heat source method according to claim 4, wherein the beaker fixing structure further comprises a heightening metal block (6) and a beaker limiting device (8), the heightening metal block (6) is placed at the bottom of the groove below the opening of the working area of the horizontal constant temperature tank (1), and the beaker limiting device (8) is fixed on the heightening metal block (6) and used for limiting the beaker (9).

6. The device for measuring the heat conductivity coefficient of the liquid by the point heat source method according to claim 5, wherein the length, the width and the height of the heightening metal block (6) are respectively 80mm, 60mm and 30mm, the beaker limiting device (8) is an upper ring and a lower ring with the diameter of 68mm, and the two rings are welded through two vertical rods and are used for limiting the placement position of the beaker (9).

7. The spot heat source method liquid thermal conductivity measuring device according to claim 1, wherein the sensor fixing frame comprises a base (201), a cross rod (202), a vertical rod (203), a cross rod knob (205) of a sliding block (204) and a vertical rod knob (206), the bottom of the vertical rod (203) is installed on the base (201), the vertical rod (203) and the cross rod (202) are inserted into the sliding block (204), and the cross rod (202) is enabled to move and lock in the height, front and back positions by adjusting the vertical rod knob (206) and the cross rod knob (205) on the sliding block (204).

8. The device for measuring the heat conductivity coefficient of the liquid by the point heat source method according to claim 1, wherein the shell (2) comprises a head sealing cover (301), a head limiting fixing section (302), an external thread limiting section (303), a limiting disc (304), a long cylinder rod (307) and a lead-out wire (309);

two pins of the thermistor (7) are respectively divided through two holes on the head sealing cover (301), the front end of the head limiting and fixing section (302) is connected with the head sealing cover (301), and the rear end of the head limiting and fixing section is connected with the front end of the external thread limiting section (303); the limiting disc (304) is sleeved on the external thread limiting section (303) and can be used for adjusting the position, and a rubber ring (306) is sleeved on the periphery of the limiting disc (304) and used for ensuring that the thermistor (7) is positioned at the center of the beaker (9); the rear end of the external thread limiting section (303) is connected with the front end of the long cylinder rod (307), the rear end of the long cylinder rod (307) is connected with a lead-out wire (309) through a fixed locking head (308), the lead-out wire (309) is four-core, each two cores are connected with a lead-out wire of a thermistor (7) pin penetrating through the shell (2), and the lead-out wire (309) is connected to a sensor interface of the host computer (13).

9. The device for measuring the thermal conductivity of the liquid by the point heat source method according to claim 8, wherein the limit disc (304) is provided with air holes (305) distributed in an array.

10. The spot heat source method liquid thermal conductivity measuring device according to claim 8, wherein the spot heat source sensor is provided with a protective cover (402), a sensor protective cover internal fixing groove (403) is formed in the protective cover, a sensor head limiting fixing protrusion (404) is formed on the head limiting fixing section (302), and the sensor head limiting fixing protrusion (404) is matched with the sensor protective cover internal fixing groove (403).