CN209342554U - A kind of thermostat for operating viscosity liquid definite value - Google Patents
A kind of thermostat for operating viscosity liquid definite value Download PDFInfo
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- CN209342554U CN209342554U CN201821954412.9U CN201821954412U CN209342554U CN 209342554 U CN209342554 U CN 209342554U CN 201821954412 U CN201821954412 U CN 201821954412U CN 209342554 U CN209342554 U CN 209342554U
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Abstract
The utility model provides a kind of thermostat for operating viscosity liquid definite value, including groove body, temperature controller, temperature sensor, heating refrigeration system and agitation cycle device；Agitator is set inside groove body, fluid inlet and fluid outlet are provided on agitator, the height of fluid inlet is higher than the height of fluid outlet；The bottom end of groove body, which is equipped with, shunts screen；Shunt the height for being horizontally mounted height and being higher than agitator fluid outlet of screen；The space that agitator outer wall and shunting screen surround is the workspace of groove body, and the fluid in agitator enters the workspace of groove body by fluid outlet, shunting screen；The workspace fluid of groove body enters agitator by fluid inlet；Temperature sensor is fixed on the workspace of groove body；The input terminal of temperature controller is connect with temperature sensor and heating refrigeration system respectively with output end；Heating refrigeration system and agitation cycle device are fixed in agitator.Solve the problems, such as that temperature accuracy existing for current thermostat, uniformity, stability are poor.
Description
Technical field
The utility model relates to a kind of thermostats, and in particular to a kind of thermostat for operating viscosity liquid definite value.
Background technique
The viscosity of liquid comes from molecular attraction, and temperature increases, and intermolecular distance increases, and molecular attraction reduces, interior friction
Weaken, viscosity reduces.The relationship of viscosity and temperature is very close, and at normal temperatures and pressures, when 1 DEG C of temperature change, liquid glues
Degree variation reaches a few percent to more than ten.Therefore, the accuracy of thermostat temperature, uniformity and stability are to operating viscosity liquid definite value
It is extremely important.
In operating viscosity liquid definite value and capillary viscometer calibrating/calibration, to observe liquid level by capillary viscometer
Graticule is the judgement of timing starting point to timing ball up and down, this just needs to minimize extraneous influence to capillary in the whole process
Liquid generates vibration in pipe viscosimeter.But at present in large-scale thermostatic water bath, it is generally used refrigeration compressor and realizes drop
Temperature, and refrigeration compressor necessarily causes to vibrate at work, in operating viscosity liquid definite value and capillary viscometer calibrating/calibration
Introduce excessive error.
Utility model content
In order to solve the problems, such as that temperature accuracy existing for current thermostat, uniformity, stability are poor, the utility model
A kind of thermostat for operating viscosity liquid definite value is provided, which can provide satisfactory temperature for operating viscosity liquid definite value
Spend environment.
The technical solution of the utility model is to provide a kind of thermostat for operating viscosity liquid definite value, it is special it
Be in: including groove body, temperature controller, temperature sensor, heating system and agitating device；
Agitator is fixedly installed inside above-mentioned groove body, is provided with fluid inlet and fluid outlet on agitator, above-mentioned fluid enters
The height of mouth is higher than the height of fluid outlet；
Above-mentioned groove body bottom end, which is equipped with, shunts screen；Shunt the height for being horizontally mounted height and being higher than agitator fluid outlet of screen
Degree；The space that agitator outer wall and screen surround is groove body workspace, and the fluid in agitator passes through fluid outlet, shunting screen
Into groove body workspace；The fluid of groove body workspace enters agitator by fluid inlet；
Above-mentioned temperature sensor is fixed on groove body workspace；
The input terminal of above-mentioned temperature controller is connect with temperature sensor and heating refrigeration system respectively with output end；It is above-mentioned
Heating refrigeration system and agitating device are fixed in agitator.
Heating refrigeration system is placed on to the mixed zone (i.e. in agitator) in thermostat workspace next door, cold and hot medium is mixing
Mixed under the action of blender in area, mixed zone bottom be cold and hot medium fluid-mixing outlet, heat by this export into
Enter thermostat workspace, by the shunting grid of workspace bottom, well-mixed fluid media (medium) is made to flow uniformly through workspace, eliminates
Horizontal and vertical temperature gradient.
Further, influence of the pressure medium of recirculation hole to flow, the utility model are crossed on screen in order to reduce to shunt
The diameter design of recirculation hole on screen will be shunted are as follows: be gradually increased from the near to the remote with mixing drum distance, guarantee that thermostat has
Better temperature uniformity.
Further, for the ease of the monitoring of calibrating/calibration process, satisfaction is completed with industrial camera to entire calibrating/school
The detection requirement of quasi- process, the groove body are cube, and front-rear side walls are using thick tempered glass；
Further, in order to which the temperature for guaranteeing medium in workspace is stable and uniform, the longitudinal axis and groove body of the agitator
Bottom is vertical, and in the case where stirring pushes, working media flows from above to below in agitator.
Further, the agitator is two, is located at the opposite sides of groove body.
Further, the heating refrigeration system includes mutually independent heating system and cooling system, above-mentioned heating system
System includes heater, and above-mentioned cooling system includes refrigeration compressor and cooling coil, and above-mentioned heater is located at cooling coil to be stirred
It mixes in bucket, refrigeration compressor is located at outside groove body.
Further, above-mentioned agitating device is mechanical stirring, and agitating shaft is overlapped with the agitator longitudinal axis.
Further, agitator speed 1250r/min will not both cause to shake, influence viscosimeter verticality, can also make
Workspace temperature is uniform and stable as early as possible to get off.
It further, further include setting in order to accurately read viscosmeter measurement numerical value and accurate adjusting viscosmeter verticality
The luminous zone of backlight and groove body rear on the outside of groove body rear wall；To light source requirements: (1) thermal exposure is low, to subtract as far as possible
Few light source thermal exposure influences work room temperature.(2) it shines uniformly, reduces the reading collimation error.
Luminous zone forms luminous matrix by 42 groups of LED, and every 3 LED is one group, is powered by 12V DC Switching Power Supply.In perseverance
Upper, middle and lower respectively installs luminous matrix on rear side of warm slot workspace, installs backlight on the corresponding thermostat rear wall in luminous zone, in this way
Entire thermostat workspace light can be made uniform, be more suitable for observing the situation of liquid level in capillary viscometer, while can disappear
Except reflective and influence of the refractive power to observation.
Further, above-mentioned temperature sensor is platinum resistance thermometer, is fixed on groove body work district center.
The beneficial effects of the utility model are:
1, the utility model is mainly that operating viscosity liquid definite value provides stable, uniform, accurate temperature environment, this is practical new
Type thermostat temperature range: (5~50) DEG C；Temperature fluctuation: 0.01 DEG C；Temperature uniformity: 0.01 DEG C.The thermostat ensure that
The uniformity of temperature and the requirement of fluctuation degree, it is structurally reasonable feasible, there is very big promotional value.
2, groove body is divided into mutually independent workspace and mixed zone by the utility model, and stirring is carried out in mixed zone, stirring
Caused vibration will not generate vibration to liquid in capillary viscometer；And be heated to cooling system and be respectively positioned in mixed zone, it is cold and hot
Medium mixes under the action of blender in mixed zone, and mixed zone bottom is the outlet of cold and hot medium fluid-mixing, and heat passes through
This outlet, which enters thermostat workspace, flows uniformly through well-mixed fluid media (medium) by the shunting grid of workspace bottom
Workspace, elimination of level and vertical temperature gradient；Significantly improve the uniformity and stability of thermostat entirety.
3, the utility model groove body bottom end shunt screen on recirculation hole diameter with mixing drum distance from the near to the remote by
Cumulative big, the medium pushed by blender enters constant temperature working region by shunting screen from mixing drum lower end, according to stirring
The size of the distance between bucket adjustment recirculation hole, so that the pressure medium by each recirculation hole is identical, Jie that blender is pushed
Matter uniformly effectively shunt, so as to better ensure that the uniformity of thermostat working region temperature.
4, groove body is designed as cube, can satisfy while examining and determine/calibrating 6 working capillary viscosimeters, and need
The requirement of the monitoring to entire calibrating/calibration process is completed with industrial camera.
5, the utility model uses Fuzzy Adaptive PID temperature controller neural network based, existing neural network control
The self-learning capability and MPP ability of system, but have the advantages that fuzzy control flexibly, strong applicability, also have
PID control feature with high accuracy, and it is able to achieve the online self-adjusting function of pid parameter；
Detailed description of the invention
Fig. 1 is Fuzzy Adaptive PID temperature controller control principle drawing neural network based；
In figure, KP is proportionality coefficient, and KI is integral coefficient, and KD is differential coefficient, and r is input, and y is output, and { E } is error
With the fuzzy quantity after error change amount.
Fig. 2 is thermostat trough body structure thermal field schematic diagram；
In figure: 1- temperature sensor, 2- agitator, 3- heater, 4- cooling coil, 5- agitating device, 9- groove body, 8- stream
Body outlet；
Fig. 3 is working media loop direction schematic diagram；
6- shunts screen, 7- fluid inlet；
Fig. 4 is that groove body bottom end shunts screen schematic diagram.
Specific embodiment
The utility model is further described through below in conjunction with drawings and the specific embodiments.
Thermostat trough body structure, the thermal inertia of system, the thermally equivalent situation of medium, the good flow regime of mixture and
Complete machine operating reliability all directly affects the constant temperature effect of thermostat.Consider from hardware aspect, the constant temperature effect and slot of thermostat
Body interior shape is related, and when groove body shape is sphere, temperature is most uniform, and constant temperature effect is best.In order to meet while examining and determine/
6 working capillary viscosimeters are calibrated, and need to complete to want the monitoring of entire calibrating/calibration process with industrial camera
It asks, is designed as spherical or cylindrical body if thermostat mentioned, will increase dramatically the difficulty of the collaborative work of other function component,
Through comprehensive consideration, constant temperature groove body is designed as cube by the utility model, and the present embodiment specific structure is as shown in Figures 2 and 3, main
It to include groove body 9, two agitators 2 inside groove body 9 and the shunting screen 6 positioned at groove body bottom end, 9 front-rear side walls of groove body
Part uses 10mm thickness tempered glass, convenient for the monitoring of calibrating/calibration process；Two agitators 2 are respectively close to the opposite of groove body 9
Two left and right sidewall settings, central point are placed for the platinum resistance thermometer of monitoring temperature.Temperature controller is according to platinum resistance temperature
The temperature control of degree meter acquisition is heated to cooling system, so that thermostat work is at a set temperature.
Currently, temperature controlled method mainly has standard PID control, modified PID control, intelligent PID control, obscures
Control and ANN Control etc., they respectively have advantage and disadvantage.In practical applications, according to specific application, different
Heating target, different control require and control precision, selects different control modes.In order to meet wanting for high accuracy temperature control
It asks, the temperature control of thermostat must use some other control means and method, such as intelligent control, self adaptive control, mould
Paste control, ANN Control etc..
The present embodiment selects Fuzzy Adaptive PID temperature controller neural network based, which will be neural
Both network-control, Fuzzy Adaptive PID Control combine, this kind of Fuzzy Adaptive PID Control side neural network based
Method, the self-learning capability and MPP ability of existing ANN Control, and the flexible, applicability with fuzzy control
Strong advantage also has the characteristics that PID control is with high accuracy, and is able to achieve the online self-adjusting function of pid parameter.Its system knot
Composition is as shown in Figure 1.
The high Accuracy PID temperature controller effectively combines fuzzy control, ANN Control and PID control, using folding
Line approximation method carries out linearity correction, improves the accuracy of temperature control control.This controller has five displays, 0.001 DEG C
High-resolution；Caused temperature control disorder when load variation in order to prevent, attached power feedforward control in the output of PID
Circuit；With enhanced auto computing and isolation simulation pick-up output function；It is convenient remote with RS232 and RS485 communication interface
Process control.
In negative operating viscosity liquid definite value and working capillary viscosimeter calibrating/calibration process, to observe liquid level and capillary
Subject to the graticule up and down of timing ball, therefore in whole work process, vibration is minimized, in order to avoid shadow is caused to test result
It rings.Currently, be generally used refrigeration compressor in large-scale thermostatic water bath and realize cooling, and refrigeration compressor at work must
So cause to vibrate.Based on the above reasons the considerations of, the present embodiment will heat refrigeration system and agitating device is all set in two and stirs
It mixes in bucket, heating refrigeration system includes mutually independent heating system and cooling system, and heating system includes heater 3, cooling
System includes refrigeration compressor and cooling coil 4, and heater 3 and cooling coil 4 are located in agitator 2, and refrigeration compressor is located at
Outside groove body 9.The present apparatus is separated refrigeration as the module that works independently, using heating refrigeration separating treatment by cold liquid
It is introduced into thermostat in a manner of pumping stream, vibration caused by reduction heating process of refrigerastion, for improving thermostat performance with aobvious
The effect of work.It is typically designed and directly isolated heater and refrigerating evaporator (cold source) is placed in the container of thermostat, be easy
Generate horizontal and vertical temperature gradient.Through analyzing, mixed zone and workspace thermal field are isolated, thermostat entirety can be significantly improved
Uniformity and stability.Refrigeration system and heating system are placed on to the mixed zone i.e. agitator in thermostat workspace next door together
Inside, cold and hot medium mix under the action of blender in mixed zone, and mixed zone bottom is the outlet of cold and hot medium fluid-mixing,
Heat enters thermostat workspace by this outlet, by the shunting screen of workspace bottom, well-mixed fluid is made to be situated between
Matter flows uniformly through workspace, to eliminate horizontal and vertical temperature gradient.
Temperature to guarantee medium in workspace is stable and uniform, selects lateral stirring scheme, stirs and fill in the present embodiment
5 are set as mechanical stirring, mechanical stirring device is placed vertically in agitator 2, thermostat circulatory system working principle are as follows: stirring
Under promotion, working media flows from above to below in mixed zone, first carries out heat exchange through cooling coil and heater, work is made to be situated between
It after matter reaches a certain suitable temperature, is stirred strongly by blender, is sufficiently mixed the not very uniform working media of temperature, into
And the medium that pushes the work forward is exported from agitator bottom flow and is flowed out, then water conservancy diversion passes upward through the shunting screen of groove body bottom and enters work
Make area, and make medium that there is certain flow velocity, agitator speed designs in 1250r/min or so, will not both cause to shake, and influences
Viscosimeter verticality can also make workspace temperature is uniform and stable as early as possible to get off.During flowing through workspace, it is desirable that medium is most
Amount reduction and extraneous heat exchange, just can guarantee that workspace medium temperature is uniform in this way, and good for the control creation of high-quality amount temperature
Good condition.Hereafter medium flows into mixed zone by the fluid inlet on agitator again, successively makees duplicate to circulate (arrow
Refer to mixture flow direction), as shown in Figure 3.
Thermostat set temperature (i.e. temperature controller displays temperature) is when being near or below room temperature, thermostat refrigeration system
It puts into operation, it realizes cooling by the cold liquid cooling but working media that cold liquid inlet enters in groove body.In order to improve medium
Rate of temperature fall, refrigerating capacity divide two-stage adjustable, when starting cooling, the temperature of cold liquid can be made lower；Near constant temperature or lower limit temperature
When work, then enables the temperature of cold liquid close to thermostat setting temperature (cold liquid temperature is less than thermostat and temperature is arranged), also have in this way
Stablize conducive to temperature.In constant temperature, two parts of cold liquid and heating are worked at the same time in thermostat, and cold liquid mainly provides refrigerating capacity,
It is used to provide balance heat for cooling down and finally keeping required low temperature, and heat and realizes temperature control.
Under normal circumstances, be uniformly distributed recirculation hole of the same size on 9 bottom tapping screen 6 of groove body, this design for
The thermostat that heating refrigeration system is placed on bottom is proper, and the uniformity of thermostat working region temperature may be implemented in it.
But it is located relatively at for the design of 9 side wall of groove body to cooling system in this present embodiment, is heated to, this shunting screen then has obviously
The drawbacks of: the working media pushed by agitating device 5 enters constant temperature working region by shunting screen 6 from 2 lower end of mixing drum, because
To shunt recirculation hole on screen 6 and mixing drum 2 apart from different, and the pressure medium difference by recirculation hole is caused, is integrally in
Now from the near to the remote because of distance, the phenomenon that pressure decline, will result in has very big difference by the amount of the thermostatic medium of recirculation hole, from
And influence the whole uniformity of constant temperature working region.
For the utility model in order to enable thermostat has better temperature uniformity, it is special to have carried out to bottom tapping screen 6
Design.From fig. 4, it can be seen that the diameter of the recirculation hole of bottom tapping screen 6 is gradually increased from the near to the remote with mixing drum distance,
The medium that blender pushes can be carried out so uniformly effectively to shunt, so as to better ensure that thermostat working region temperature
The uniformity of degree.
Claims (10)
1. a kind of thermostat for operating viscosity liquid definite value, it is characterised in that: passed including groove body (9), temperature controller, temperature
Sensor (1), heating refrigeration system and agitating device；
Agitator (2) are fixedly installed in the inside of the groove body (9), are provided with fluid inlet (7) and fluid outlet on agitator (2)
(8), the height of the fluid inlet (7) is higher than the height of fluid outlet (8)；
The bottom end of the groove body (9), which is equipped with, shunts screen (6)；The height that is horizontally mounted for shunting screen (6) is higher than agitator fluid
Export the height of (8)；The space that agitator (2) outer wall and shunting screen (6) surround is the workspace of groove body (9), agitator (2)
Interior fluid enters the workspace of groove body (9) by fluid outlet (8), shunting screen (6)；The workspace fluid of groove body (9) is logical
Fluid inlet (7) are crossed into agitator (2)；
The temperature sensor is fixed on the workspace of groove body (9)；
The input terminal of the temperature controller is connect with temperature sensor (1) and heating refrigeration system respectively with output end；It is described
Heating refrigeration system and agitating device are fixed in agitator (2).
2. the thermostat according to claim 1 for operating viscosity liquid definite value, it is characterised in that: shunt on screen (6)
The diameter of recirculation hole is gradually increased from the near to the remote with mixing drum distance.
3. the thermostat according to claim 1 for operating viscosity liquid definite value, it is characterised in that: the groove body (9) is
Cube, front-rear side walls use tempered glass.
4. the thermostat according to claim 3 for operating viscosity liquid definite value, it is characterised in that: the agitator (2)
The longitudinal axis it is vertical with groove body bottom.
5. the thermostat according to claim 4 for operating viscosity liquid definite value, it is characterised in that: the agitator (2)
It is two, is located at the opposite sides of groove body (9)；The temperature controller uses fuzzy self-adaption neural network based
PID temperature controller.
6. the thermostat according to claim 1 for operating viscosity liquid definite value, it is characterised in that: heating refrigeration system
System includes mutually independent heating system and cooling system, and the heating system includes heater (3), and the cooling system includes
Refrigeration compressor and cooling coil (4), the heater (3) and cooling coil (4) are located in agitator (2), refrigeration compressor
It is external positioned at groove body (9).
7. the thermostat according to claim 6 for operating viscosity liquid definite value, it is characterised in that: the agitating device
It (5) is mechanical stirring, agitating shaft is overlapped with agitator (2) longitudinal axis.
8. the thermostat according to claim 7 for operating viscosity liquid definite value, it is characterised in that: agitating device revolving speed
1250r/min。
9. the thermostat according to claim 1 for operating viscosity liquid definite value, it is characterised in that: further include being arranged in slot
The luminous zone of backlight and groove body rear on the outside of body rear wall.
10. the thermostat according to claim 1 for operating viscosity liquid definite value, it is characterised in that: the temperature sensing
Device is platinum resistance thermometer, is fixed on groove body work district center.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821954412.9U CN209342554U (en) | 2018-11-26 | 2018-11-26 | A kind of thermostat for operating viscosity liquid definite value |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821954412.9U CN209342554U (en) | 2018-11-26 | 2018-11-26 | A kind of thermostat for operating viscosity liquid definite value |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109724896A (en) * | 2018-11-26 | 2019-05-07 | 西安航天计量测试研究所 | A kind of thermostat for operating viscosity liquid definite value |
| CN112650322A (en) * | 2020-12-23 | 2021-04-13 | 广电计量检测（重庆）有限公司 | Constant temperature device |
-
2018
- 2018-11-26 CN CN201821954412.9U patent/CN209342554U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109724896A (en) * | 2018-11-26 | 2019-05-07 | 西安航天计量测试研究所 | A kind of thermostat for operating viscosity liquid definite value |
| CN109724896B (en) * | 2018-11-26 | 2024-04-12 | 西安航天计量测试研究所 | Constant temperature tank for working viscosity fluid constant value |
| CN112650322A (en) * | 2020-12-23 | 2021-04-13 | 广电计量检测（重庆）有限公司 | Constant temperature device |
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