CN216349920U - Built-in constant-temperature liquid refrigerating device of kinematic viscometer - Google Patents
Built-in constant-temperature liquid refrigerating device of kinematic viscometer Download PDFInfo
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- CN216349920U CN216349920U CN202122950972.5U CN202122950972U CN216349920U CN 216349920 U CN216349920 U CN 216349920U CN 202122950972 U CN202122950972 U CN 202122950972U CN 216349920 U CN216349920 U CN 216349920U
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Abstract
The utility model relates to a constant temperature liquid refrigerating device with a built-in kinematic viscometer, which comprises a constant temperature tank, a refrigerator, a stirrer and a circulating pump, wherein the constant temperature tank is used for containing constant temperature liquid, a liquid inlet and a liquid outlet for constant temperature liquid circulation are arranged at the bottom of the constant temperature tank, the refrigerator comprises a heat exchange plate, the upper end and the lower end of the heat exchange plate are respectively provided with a refrigerating assembly, so that the circulating refrigeration of the constant temperature liquid between the constant temperature tank and the refrigerator is completed through the circulating pump, the stirrer comprises a stirring shaft penetrating through the top of the constant temperature tank and a helical blade arranged on the stirring shaft, and the constant temperature tank is internally provided with a temperature sensor which is used for monitoring the temperature of the constant temperature liquid in real time. The device can quickly cool the constant temperature liquid, has high refrigeration efficiency, has no vibration due to refrigeration of the whole device through the semiconductor refrigeration piece, is highly integrated, can be arranged in the kinematic viscometer, ensures the accuracy of the test result of the kinematic viscometer, and also improves the utilization rate of the laboratory space.
Description
Technical Field
The utility model relates to a constant-temperature liquid refrigerating device, in particular to a built-in constant-temperature liquid refrigerating device of a kinematic viscometer.
Background
The viscosity is an important index of the oil and is an indispensable parameter in petrochemical engineering design. During the use and transportation process of the oil product, the viscosity is accurately measured, and the quality of the oil product can be strictly controlled. The kinematic viscosity measurement method has various methods, and the domestic current measurement methods comprise a capillary tube measurement method, a rotation measurement method, a falling ball method, a vibration method, a flat plate method and a viscosity cup method. Among them, the gravity glass capillary measurement method is the most accurate method among the existing measurement methods, and is also the most commonly used method.
The method for measuring kinematic viscosity of oil by glass capillary is characterized by that under a certain constant temp., the time of a certain volume of liquid flowing through a calibrated glass capillary viscometer under the action of gravity is measured, and the product of capillary constant and flow time of viscometer is the kinematic viscosity of the liquid measured at said temp.
The constant temperature environment provided for the viscometer during the measurement of the dynamic viscosity is usually realized by adopting a constant temperature bath, and the constant temperature bath is widely applicable to chemical, biological and physical laboratories which need to work under the conditions of low temperature, normal temperature or high temperature, and is a necessary device for laboratories of medical and health, chemical industry, food industry, metallurgical industry, colleges and universities, scientific research, genetic engineering, high molecular engineering and the like.
The constant temperature medium used in the constant temperature bath at present is roughly alcohol, water, antifreeze, silicone oil and the like. Water is the cheapest medium, the working range is generally 5-95 ℃, but the most common 0 ℃ and 100 ℃ cannot be covered; the alcohol is suitable for being used as a low-temperature constant-temperature medium, can reach the temperature of-110 ℃, is easy to volatilize and extremely easy to burn at normal temperature, and has great potential safety hazard; the low-viscosity silicone oil is the most choice for the current universal thermostatic bath, can realize that the covering temperature reaches-50-300 ℃, and has good oxidation resistance, transparency and insulativity.
The kinematic viscosity measurement can be carried out at different temperatures, for example, diesel oil is usually required to be tested for kinematic viscosity at 20 ℃, gear oil, hydraulic oil, heat transfer oil and the like are usually required to be tested for kinematic viscosity at 40 ℃, heavy fuel oil, residual oil and the like are usually required to be tested for kinematic viscosity at 80 ℃ or 100 ℃, the viscosity index is an important index for guiding production of the vehicle engine oil, the viscosity index is required to be calculated by testing the kinematic viscosity at 40 ℃ and 100 ℃, and then a constant temperature tank of a viscometer needs to be kept at different temperatures, and the viscometer is more likely to need to be switched back and forth at different temperatures.
In general, a thermostat bath maintains the temperature of a thermostatic medium in the thermostat bath by controlling the operation time of a heater, and thus a set target temperature needs to be higher than an ambient temperature. Thermostatic baths not equipped with a refrigeration device cannot be realized at room temperature above 20 ℃ when the kinematic viscosity at 20 ℃ needs to be tested.
A thermostatic bath with the volume of 3L is naturally cooled from 100 ℃ to 40 ℃ in the environment with the room temperature of 25 ℃, and the time is more than 1.5 hours, so that the testing efficiency of the kinematic viscosity is greatly reduced, and a refrigeration device is very necessary to be equipped for a kinematic viscometer.
The principle of the refrigeration device generally provided for the kinematic viscometer is an external circulation type low-temperature thermostatic bath, and is that a heat-conducting medium is refrigerated through a compressor, and then the refrigerated heat-conducting medium is introduced into the thermostatic bath to exchange heat with the thermostatic medium. This approach presents several drawbacks:
1) firstly, the heat-conducting medium is refrigerated, and then the refrigerated heat-conducting medium exchanges heat with the constant-temperature liquid, which means that the refrigerating efficiency is not high;
2) a good radiator is needed when a compressor is adopted for refrigeration, so that the volume cannot be small;
3) various instruments and equipment in an oil product analysis laboratory are more and more, high-integration instruments become a trend, a compressor can have obvious vibration during working, the vibration is a great contraindication for measuring kinematic viscosity, and the accuracy of test check can be directly influenced.
It is very necessary to design a refrigerating device which has high refrigerating efficiency, small volume and no vibration and can be integrated into the kinematic viscometer.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems, the utility model provides the built-in constant temperature liquid refrigerating device of the kinematic viscometer, which has high refrigerating efficiency, small volume, no vibration and high integration.
The technical scheme adopted by the utility model for solving the technical problems is as follows: a built-in constant temperature liquid refrigerating device of a kinematic viscometer comprises a constant temperature bath, a refrigerator, an agitator and a circulating pump, wherein the constant temperature bath is used for containing constant temperature liquid, the bottom of the constant temperature bath is provided with a liquid inlet and a liquid outlet for constant temperature liquid circulation, the refrigerator comprises a heat exchange plate, the upper end and the lower end of the heat exchange plate are respectively provided with a refrigerating assembly, one side of the heat exchange plate is provided with a heat exchange plate inlet and a heat exchange plate outlet for constant temperature liquid circulation, the liquid outlet is connected with an inlet pipeline of the circulating pump, an outlet pipeline of the circulating pump is connected to the heat exchange plate inlet, the heat exchange plate outlet pipeline is connected to the liquid inlet of the constant temperature bath, so that the circulating refrigeration of the constant temperature liquid between the constant temperature bath and the refrigerator is completed through the circulating pump, the agitator comprises a stirring shaft penetrating through the top of the constant temperature bath and a helical blade arranged on the stirring shaft, the temperature sensor is also arranged in the constant temperature bath, the temperature sensor is used for monitoring the temperature of the constant temperature liquid in real time.
Preferably, each refrigerating assembly comprises a semiconductor refrigerating piece, a radiating fin and a radiating fan, the cold end of the semiconductor refrigerating piece is connected with the heat exchange plate, the hot end of the semiconductor refrigerating piece is connected with one surface of the radiating fin, and the other surface of the radiating fin is provided with the radiating fan.
Preferably, the number of the semiconductor refrigeration pieces, the number of the heat radiating fins and the number of the heat radiating fans in each refrigeration assembly are two.
Preferably, the stirring shaft is driven by a motor.
Preferably, the output end of the motor is connected with the stirring shaft through the transmission shaft, the stirring shaft is sleeved with the helical blades, and the input end of the motor is electrically connected with the kinematic viscometer host.
Preferably, the kinematic viscometer host is also used for controlling the semiconductor refrigeration piece, the cooling fan, the circulating pump and the temperature sensor.
Preferably, a heat insulation layer is arranged on the pipeline.
Preferably, the heat insulation layer is an expanded perlite rubber plate.
Compared with the prior art, the utility model has the following beneficial effects:
1. the circulating pump is adopted to pump out the constant temperature liquid in the constant temperature bath and directly cool the constant temperature liquid through the heat exchange plate, and the heat conduction medium is not used for cooling in the constant temperature bath through heat exchange, so that the constant temperature liquid can be quickly cooled, and the refrigeration efficiency is improved;
2. the semiconductor refrigeration piece is used as a refrigeration element to replace the traditional compressor for refrigeration, has obvious advantages of no mechanical motion, no abrasion, small volume, high reliability and no vibration, is very suitable for the built-in installation of the kinematic viscometer, and improves the utilization rate of the laboratory space;
3. the semiconductor refrigerating sheet, the circulating pump and the cooling fan do not need to be controlled independently, and are started and stopped simultaneously during operation.
The high integration of the whole device is realized;
4. the stirrer drives the stirring shaft to move through the motor, so that the spiral blades are driven to stir the constant temperature liquid, the flowing speed of the constant temperature liquid is accelerated, and further, when the temperature needs to be changed, the temperature of each part in the constant temperature tank can quickly reach relative balance, so that the accuracy of the test result of the kinematic viscometer is improved;
5. the temperature sensor can monitor the temperature of the constant temperature liquid in real time, so that a signal is transmitted to the kinematic viscometer, and the whole device is controlled to be started or stopped according to the required temperature set by the kinematic viscometer, so that the required temperature can be accurately controlled.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an exploded schematic view of the refrigerator of the present invention;
FIG. 3 is a sectional view of the thermostatic bath and the stirrer in the present invention;
FIG. 4 shows the time taken for the thermostat to reach each temperature point from 100 ℃ to 40 ℃ by starting the apparatus of the utility model and naturally cooling.
Detailed Description
The utility model will now be described in detail with reference to fig. 1-4, wherein exemplary embodiments and descriptions of the utility model are provided to illustrate the utility model, but not to limit the utility model.
A kind of kinematic viscometer embeds the refrigerating plant of the thermostatted fluid, it includes thermostatted container 1, freezer, agitator and circulating pump 2, the thermostatted container is used for holding the thermostatted fluid, and there are inlet 3 and liquid outlet 4 used for the thermostatted fluid to circulate at the bottom of the thermostatted container, the freezer includes the heat-exchanging plate 5, both ends are equipped with a refrigeration assembly about the heat-exchanging plate, and the said heat-exchanging plate has heat-exchanging plate entry 9 and heat-exchanging plate exit 10 used for the thermostatted fluid to circulate on one side, the said liquid outlet couples to inlet pipeline of the circulating pump, the exit pipeline of the said circulating pump is connected to the entry of the heat-exchanging plate, the said heat-exchanging plate exit pipeline is connected to the inlet of the thermostatted container, thus finish the circulation refrigeration of the thermostatted fluid between thermostatted container and freezer through the circulating pump, the said agitator includes the (mixing) shaft 11 and helical blade 12 locating on the (mixing) of the top of the thermostatted container, the (mixing) shaft drives through the electrical machinery 14, the output of motor passes through transmission shaft 15 and links to each other with the (mixing) shaft, the cover is equipped with helical blade on the (mixing) shaft, the input and the kinematic viscosity appearance host computer electrical property of motor link to each other, can control the work of motor through the kinematic viscosity appearance host computer to make the motor drive (mixing) shaft and helical blade stirring thermostated fluid by oneself, accelerate the thermostated fluid and realize temperature balance in the thermostatic bath, the inside temperature sensor 13 that still is equipped with of thermostatic bath, temperature sensor is used for the temperature of real-time supervision thermostated fluid, and when the temperature that temperature sensor detected was higher than the target temperature that the kinematic viscosity appearance set up, the device will start and make the thermostated fluid reach target temperature rapidly.
Each refrigerating assembly comprises a semiconductor refrigerating sheet 6, a radiating sheet 7 and a radiating fan 8, the cold end of the semiconductor refrigerating sheet is connected with a heat exchange plate, the hot end of the semiconductor refrigerating sheet is connected with one side of the radiating sheet, the other side of the radiating sheet is provided with the radiating fan, the number of the semiconductor refrigerating sheet, the number of the radiating sheet and the number of the radiating fan in each refrigerating assembly are two, a minimum volume height integration can be achieved through the combination of one heat exchange plate, four semiconductor refrigerating sheets, four radiating sheets and four radiating fans, the optimal refrigerating effect can be achieved, the cold end and the opposite hot end of each semiconductor refrigerating sheet can generate temperature difference in the process of constant temperature liquid circulating in the heat exchange plate, and therefore when the cold end of the semiconductor refrigerating sheet connected with the heat exchange plate starts to refrigerate, the heat of the constant temperature liquid in the heat exchange plate is transmitted to the hot end of the semiconductor refrigerating sheet at the same time, the heat is distributed by the radiating fins and the radiating fan together, so that the constant temperature liquid in the heat exchange plate is cooled, in the whole cooling process, the constant temperature liquid in the constant temperature bath is pumped out by the circulating pump and is directly cooled by the heat exchange plate, the heat-conducting medium is not used for cooling in the constant temperature bath through heat exchange, the whole work flow is simplified, the operation is convenient, and the refrigerating efficiency is improved.
Semiconductor refrigeration piece in this device, radiator fan, circulating pump and temperature sensor need not the independent control, can open simultaneously when moving and stop, whole device is all by kinematic viscosity appearance host control, the high integration of being convenient for, the volume diminishes, laboratory space utilization has been improved, and need not to set up the compressor through the refrigeration of semiconductor refrigeration piece, secondly radiator fan and circulating pump in this device, the motor all adopts the low noise, the low vibration product, vibration in its course of operation can be ignored for the vibration of traditional compressor, the accuracy of kinematic viscosity appearance testing result has been improved.
The pipeline is provided with a heat insulation layer which is an expanded perlite rubber plate, the expanded perlite rubber plate is a white granular rubber plate which is internally of a honeycomb structure and is made by preheating perlite ore sand and instantaneously roasting and expanding at high temperature, the heat insulation layer has excellent heat insulation performance, and the heat insulation performance of the heat insulation liquid conveyed in the pipeline is effectively improved in the process of conveying the constant temperature liquid.
The time taken for the thermostated fluid to reach each temperature point from 100 ℃ to 40 ℃ at room temperature 25 ℃ by comparative activation of the device and natural cooling is shown in the table in fig. 4:
can see through the table, through starting this device, the obvious refrigeration time that has shortened to quick refrigerate to the thermostatted fluid, the automatic stirring of rethread agitator can accelerate the flow rate of thermostatted fluid, and then makes when the temperature needs to change, and each temperature in the thermostatic bath can reach relative equilibrium very fast, thereby when improving refrigeration efficiency and test result accuracy, has accelerated the work efficiency in laboratory.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the embodiments are only used to help understanding the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the present description should not be construed as a limitation to the present invention.
Claims (8)
1. The utility model provides a built-in constant temperature liquid refrigerating plant of kinematic viscometer which characterized in that: the constant temperature refrigeration device comprises a constant temperature tank (1), a refrigerator, an agitator and a circulating pump (2), wherein the constant temperature tank is used for containing constant temperature liquid, a liquid inlet (3) and a liquid outlet (4) for constant temperature liquid circulation are arranged at the bottom of the constant temperature tank, the refrigerator comprises a heat exchange plate (5), a refrigeration assembly is arranged at each of the upper end and the lower end of the heat exchange plate, a heat exchange plate inlet (9) and a heat exchange plate outlet (10) for constant temperature liquid circulation are arranged on one side of the heat exchange plate, the liquid outlet is connected with an inlet pipeline of the circulating pump, an outlet pipeline of the circulating pump is connected to the heat exchange plate inlet, the heat exchange plate outlet pipeline is connected to the liquid inlet of the constant temperature tank, so that the circulating refrigeration of the constant temperature liquid between the constant temperature tank and the refrigerator is completed through the circulating pump, the agitator comprises a stirring shaft (11) penetrating through the top of the constant temperature tank and a spiral blade (12) arranged on the stirring shaft, and a temperature sensor (13) is further arranged inside the constant temperature tank, the temperature sensor is used for monitoring the temperature of the constant temperature liquid in real time.
2. The device for refrigerating the constant-temperature liquid arranged in the kinematic viscometer according to claim 1, wherein: every refrigeration subassembly all includes semiconductor refrigeration piece (6), fin (7) and radiator fan (8), the cold junction and the heat transfer board of semiconductor refrigeration piece link to each other, the hot junction and the fin one side of semiconductor refrigeration piece link to each other, the fin another side is equipped with radiator fan.
3. The device for refrigerating the constant-temperature liquid arranged in the kinematic viscometer according to claim 2, wherein: the number of the semiconductor refrigeration pieces, the number of the cooling fins and the number of the cooling fans in each refrigeration assembly are two.
4. The device for refrigerating the constant-temperature liquid arranged in the kinematic viscometer according to claim 1, wherein: the stirring shaft is driven by a motor (14).
5. The device for refrigerating the constant-temperature liquid arranged in the kinematic viscometer according to claim 4, wherein: the output end of the motor is connected with the stirring shaft through a transmission shaft (15), the stirring shaft is sleeved with a helical blade, and the input end of the motor is electrically connected with the kinematic viscometer host.
6. The device for refrigerating the constant-temperature liquid arranged in the kinematic viscometer according to claim 5, wherein: the kinematic viscometer host is also used for controlling the semiconductor refrigeration sheet, the cooling fan, the circulating pump and the temperature sensor.
7. The device for refrigerating the constant-temperature liquid arranged in the kinematic viscometer according to claim 1, wherein: and a heat insulation layer is arranged on the pipeline.
8. The device for refrigerating the constant-temperature liquid arranged in the kinematic viscometer of claim 7, wherein: the heat insulating layer is an expanded perlite rubber plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122950972.5U CN216349920U (en) | 2021-11-29 | 2021-11-29 | Built-in constant-temperature liquid refrigerating device of kinematic viscometer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122950972.5U CN216349920U (en) | 2021-11-29 | 2021-11-29 | Built-in constant-temperature liquid refrigerating device of kinematic viscometer |
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| CN216349920U true CN216349920U (en) | 2022-04-19 |
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| CN202122950972.5U Active CN216349920U (en) | 2021-11-29 | 2021-11-29 | Built-in constant-temperature liquid refrigerating device of kinematic viscometer |
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