CN108981969A - Geotechnical centrifuge windage quantity of heat production test device and method under vacuum environment - Google Patents
Geotechnical centrifuge windage quantity of heat production test device and method under vacuum environment Download PDFInfo
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- CN108981969A CN108981969A CN201810579061.6A CN201810579061A CN108981969A CN 108981969 A CN108981969 A CN 108981969A CN 201810579061 A CN201810579061 A CN 201810579061A CN 108981969 A CN108981969 A CN 108981969A
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- insulation layer
- thermal insulation
- refrigerant
- vacuum cavity
- heat
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K17/00—Measuring quantity of heat
Abstract
The invention discloses geotechnical centrifuge windage quantity of heat production test device and methods under a kind of vacuum environment.It holds external pressure shell and is provided with band thermal insulation layer vacuum cavity, vacuum chamber intracorporal central rotating shaft upper end is installed by high speed rotor, lower end is connected by sealing system with driving motor output shaft, the upper cover of vacuum cavity and the side of vacuum cavity are respectively equipped with temperature sensor, connect through temperature control driver with metering pump；The import of metering pump is connect with refrigerant storage tank, and outlet is extend into band thermal insulation layer vacuum cavity through valve, equipped with two conveying pipe of refrigerant with upper nozzle, and band thermal insulation layer vacuum cavity is controlled to a vacuum pump.Vacuum cavity and refrigerant of the present invention position is equipped with thermal insulation layer, and the heat measured will not cause error because of scattering and disappearing, and refrigerant will not cause error because other heats are absorbed.Set the internal and external temperature with thermal insulation layer vacuum cavity be it is the same, will not cause because of internal-external temperature difference cavity absorb heat can not accurate measurement, to generate error.
Description
Technical field
The present invention relates to the device and methods of heat amount test, more particularly to geotechnical centrifuge air under a kind of vacuum environment
The quantity of heat production test device that rubs and method.
Background technique
High acceleration, high speed geotechnical centrifuge are the geology such as research ground develops, geological structure develops, the reduction of geology disaster
The essential device of evolution process reproduction test.With being continuously increased for acceleration g, centrifuge speed is higher and higher, line
Speed reaches one times or more of velocity of sound or even velocity of sound, and so high revolving speed will lead to rotor and windage generates amount of heat.
Therefore geotechnical centrifuge heat dissipation problem become a problem because the revolving speed of centrifuge and linear velocity are higher, pivoted arm, hanging basket with
The heat that windage generates is bigger.It, generally can or natural wind cooling using cold wind unit when below acceleration 500g
Circulation cooling.But working as acceleration increases to after 1000g or more or even 1500g or more, heat production in 11 meters of diameter of centrifugation cabin
Amount can reach 10MW, be equivalent to the heat exchange amount of 50,000 square metres of large-size air conditioning unit, and so huge heat exchange needs huge wind
Amount, and the excessive vibration that will affect pivoted arm of wind-force, therefore traditional cold front heavy rain is no longer satisfied high acceleration centrifuge and dissipates
The needs of heat, and temperature control solution is bad, all instrument being centrifuged in cabin will appear problem, general that centrifugation cabin temperature is required to control
At 45 DEG C or less.It generally mostly uses cooling with the cooling method combined of centrifugation wall surrounding cold water；But work as the load of centrifuge
When further increasing, being centrifuged indoor quantity of heat production can be further increased, and at this time cold front heavy rain joint cold water cooling can not also reach
To the requirement of heat dissipation.In order to solve this problem, most efficient method is vacuumized to centrifugal chamber, reduces the density of air to drop
The frictional heat generation of low pivoted arm and air, but other problem can be caused after vacuumizing, first is that due to air point under vacuum state
Son is thin, and heat-transfer capability also declines to a great extent, and under vacuum state air can not convection current, therefore, caused by pivoted arm and windage
The raised heat of pivoted arm temperature can not be passed effectively.Another problem is the bearing meeting oil leak of centrifuge under high vacuum,
The sealing of centrifugation cabin surrounding all becomes difficult, therefore vacuum degree cannot be too high.Therefore it needs to make clear different high speed under vacuum to turn
Sub- quantity of heat production rule provides design considerations to the heat dissipation design of large geotechnical centrifuge.
There are many test methods of various different institutions quantities of heat production, such as Suzhou Yu Liang Battery Co., Ltd
CN201620405443.3 " measuring device for heat yield during circulating battery "；Beijing new-energy automobile limited liability company
A kind of CN201610680634.5 " battery thermal field simulator、The verification method of system and battery thermal management "；Guangdong Industrial is big
CN201020102687.7 " measuring device for heat yield of cylinder-type power battery material "；Special equipment detection in Guangdong Province's is ground
Study carefully a kind of CN201610861648.7 " industrial fuel oil steam boiler efficiency test dress based on positive balance of institute Shuande detection institute
Set and method "；CN201410266013.3 " the hand heat-sinking capability mould under high/low temperature environment under low pressure of BJ University of Aeronautics & Astronautics
Quasi- device " etc., these are the test of heating value of general object, and are also limited to temperature detection for the test under different vacuum,
There is no quantity of heat production test.A kind of method that high speed rotor quantity of heat production can be tested under different vacuum degrees not yet domestic at present,
The report of dependence test result is not seen yet.
Summary of the invention
In order to solve the problems, such as the test method in different high speed under vacuum rotor quantities of heat production, it is an object of that present invention to provide
Geotechnical centrifuge windage quantity of heat production test device and method under a kind of vacuum environment, this method are measured using low-temperature refrigerant
Into vacuum tank, the heat for absorbing the heat production of high speed rotor with low-temperature refrigerant balances each other, so that production be obtained by calculation
Heat.
The technical solution adopted by the present invention is that:
One, geotechnical centrifuge windage quantity of heat production test device under a kind of vacuum environment
The external pressure shell that holds of the invention is provided with band thermal insulation layer vacuum cavity, the intracorporal high speed rotor installation of band thermal insulation layer vacuum chamber
In the upper end of central rotating shaft, the lower end of central rotating shaft is by being mounted on the sealing system with thermal insulation layer vacuum cavity bottom and holding outer
The intracorporal driving motor output shaft of pressure shell is connected, the upper cover center of the upper end with thermal insulation layer vacuum cavity and true with thermal insulation layer
The side of cavity body is respectively equipped with temperature sensor, and two temperature sensors are connected to temperature control driver, the connection of temperature control driver
To metering pump；The bottom of refrigerant storage tank is connected with the import of metering pump, and the outlet of metering pump is connected with one end of valve,
The other end of valve is extend into band thermal insulation layer vacuum cavity by conveying pipe of refrigerant, in the band intracorporal system of thermal insulation layer vacuum chamber
Cryogen delivery pipe is equipped with two or more refrigerant spray heads；Upper cover with hold external pressure shell and connect with opening hinge fastly, band thermal insulation layer
Vacuum cavity is controlled to a vacuum pump.
The band thermal insulation layer vacuum cavity, holding for surrounding is equipped with heat-barrier material between external pressure shell and protecting against shock liner, described
Upper cover and hold between external pressure shell be equipped with gasket seal.
The refrigerant storage tank, top is equipped with pressure gauge and refrigerant fills mouth, and refrigerant fills mouth and refrigerant storage tank
Between be equipped with and fill a mouthful valve, have thermal insulation layer outside refrigerant storage tank.
Described two or more refrigerant spray heads are close to the side wall with thermal insulation layer vacuum cavity.
Two, a kind of method that geotechnical centrifuge windage quantity of heat production is tested under vacuum environment, includes the following steps:
A) high speed rotor is fixed on by lock-screw to the upper end of central rotating shaft, shut the upper cover with thermal insulation layer vacuum cavity,
Lock-screw is tightened；
B) vacuum pump is opened, the vacuum values of setting will be evacuated down to thermal insulation layer vacuum cavity, after keeping the vacuum degree, opens and drives
Dynamic motor, makes high speed rotor reach the revolving speed of setting；
C) certain heat can be generated during high speed rotor and windage, when temperature sensor detects that temperature starts to rise
Gao Shi, driving measuring pump inject refrigerant in band thermal insulation layer vacuum cavity, when refrigerant steams in band thermal insulation layer vacuum cavity
When hair, heat is absorbed, makes to keep as the temperature outside vacuum cavity with the intracorporal temperature of thermal insulation layer vacuum chamber.
D) after high speed rotor is run, the heat of generation and the heat of injection refrigerant suction reach balance, record at this time
The reading of metering pump calculates the heat of high speed rotor generation according to this reading.
The refrigerant be have the characteristics that lower than room temperature vaporization heat absorption refrigerant, be R22, R134a, R407c, R410A,
R600a, R12 or carbon dioxide.
The invention has the advantages that:
Entire measuring system heat production position is equipped with thermal insulation layer, is also equipped with thermal insulation layer with the position of refrigerant contact, therefore produce
Raw heat will not cause error because of scattering and disappearing, and refrigerant will not cause error because other heats are absorbed.The present invention
Setting the internal and external temperature with thermal insulation layer vacuum cavity is heat the same, that cavity will not be caused to absorb because of internal-external temperature difference in this way
Can not accurate measurement, to generate error；Therefore the test method precision of this test device is very high.
Detailed description of the invention
Fig. 1 is the structural front view of test device of the present invention.
Fig. 2 is the structural schematic diagram with thermal insulation layer vacuum cavity.
Fig. 3 is the top view of high speed rotor.
In figure: 1, driving motor, 2, vacuum pump, 3, vacuum suction adapter tube, 4, band thermal insulation layer vacuum cavity, 5, high speed turn
Son, 6, open hinge fastly, 7, lock-screw, 8, temperature sensor, 9, temperature sensor data line, 10, temperature control driver, 11, temperature
Control drive data line, 12, pressure gauge, 13, refrigerant fill mouth, 14, fill a mouthful valve, 15, refrigerant storage tank, 16, refrigeration
Agent, 17, conveying pipe of refrigerant, 18, metering pump, 19, valve, 20, refrigerant spray head, 21, hold external pressure shell, 22, sealing device,
23, central rotating shaft, 24, protecting against shock liner, 25, heat-barrier material, 26, upper cover, 27, gasket seal, 28, vacuum meter, 29, heat-insulated
Layer.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples.
As shown in Figure 1, Figure 2, Fig. 3, shown, the external pressure shell 21 that holds of the invention is provided with band thermal insulation layer vacuum cavity 4, with heat-insulated
High speed rotor 5 in layer vacuum cavity 4 is installed on the upper end of central rotating shaft 23, the lower end of central rotating shaft 23 by lock-screw 7
By being mounted on the sealing system 22 with 4 bottom of thermal insulation layer vacuum cavity and holding 1 output shaft of driving motor in external pressure shell 21
It is connected, 2 center of upper cover of the upper end with thermal insulation layer vacuum cavity 4 and the side with thermal insulation layer vacuum cavity 4 are respectively equipped with
Temperature sensor 8, two temperature sensors 8 are connected to temperature control driver 10, temperature control driver by temperature sensor data line 9
10 are connected to metering pump 18 by temperature control drive data line 11；Conveying pipe of refrigerant 17 and meter are arranged at the bottom of refrigerant storage tank 15
The import of amount pump 18 is connected, and the outlet of metering pump 18 is connected by conveying pipe of refrigerant 17 with one end of valve 19, valve
19 other end is connected by conveying pipe of refrigerant 17 with thermal insulation layer vacuum cavity 4, and extend into band thermal insulation layer vacuum chamber
In body 4, two or more refrigerant spray heads 20 are equipped on the conveying pipe of refrigerant 17 in thermal insulation layer vacuum cavity 4；Upper cover 2
It is connect with external pressure shell 21 is held with hinge 6 is opened fastly, band thermal insulation layer vacuum cavity 4 is connect with the vacuum suction adapter tube 3 of vacuum pump 2.
The band thermal insulation layer vacuum cavity 4, holding for surrounding are equipped with heat-barrier material between external pressure shell 21 and protecting against shock liner 24
25, the upper cover 26 and hold between external pressure shell 21 be equipped with gasket seal 27.
The refrigerant storage tank 15, top is equipped with pressure gauge 12 and refrigerant fills mouth 13, and refrigerant fills mouth 13 and system
It is equipped between cryogen storage tank 15 and fills mouthful valve 14, there is thermal insulation layer 29 outside refrigerant storage tank 15.
Described two or more refrigerant spray heads 20 are close to the side wall with thermal insulation layer vacuum cavity 4.
The refrigerant be have the characteristics that lower than room temperature vaporization heat absorption refrigerant, be R22, R134a, R407c, R410A,
R600a, R12 or carbon dioxide.
As shown in figure 3, the high speed centrifugation rotor 5, is the high speed according to a 1500G, 20.2 meters of cabin interior diameter of centrifugation
The pivoted arm shape of geotechnical centrifuge is according to scaled down to 500mm diameter, rotor at identical linear velocity 320m/s, turn
Sub- shape is according to identical scale smaller.Rotor size after diminution is diameter 440mm, the maximum line speeds of pivoted arm and windage
320m/s, rotor width 70mm are spent, with a thickness of 22mm, the hanging basket of outer most edge is with a thickness of 65mm, the interior diameter of vacuum cavity
500mm。
Refrigerant in the present embodiment uses the R134a environment friendly refrigerating fluid of environment-friendly type.
Test method of the invention is described below:
One, test philosophy of the invention
In the case where insulation effect is good enough, the heat of the friction generation with high speed rotor in thermal insulation layer vacuum cavity and air
Heat with refrigerant vaporization absorption is equal, therefore can calculate high speed by reading the refrigerant flow of metering pump
The heat that rotor generates.When controlling identical as the temperature outside vacuum cavity with the intracorporal temperature of thermal insulation layer vacuum chamber, equipment sheet
Body neither absorbs heat, does not also generate heat, therefore error caused by can reducing because of equipment itself.
Two, temprature control method of the present invention
A) high speed rotor 5 is fixed on by lock-screw 7 to the upper end of central rotating shaft 23, shut with thermal insulation layer vacuum cavity 4
Upper cover 26, lock-screw is tightened；
B) vacuum pump 2 is opened, the vacuum values of setting will be evacuated down to thermal insulation layer vacuum cavity 4, when being kept for one section of the vacuum degree
Between after, open driving motor 1, so that high speed rotor 5 is reached the revolving speed of setting；
C) certain heat can be generated during high speed rotor 5 and windage, when temperature sensor 8 detects that temperature starts
When raising, driving measuring pump 18 injects refrigerant in band thermal insulation layer vacuum cavity 4, when refrigerant is in band thermal insulation layer vacuum cavity
In 4 when evaporation, heat is absorbed, makes to keep as the temperature outside vacuum cavity with the temperature in thermal insulation layer vacuum cavity 4.
D) after high speed rotor 5 is run, the heat of generation and the heat of injection refrigerant suction reach balance, record at this time
The reading of metering pump calculates the heat of the generation of high speed rotor 5 according to this reading.Calculation method is as follows:
Under each different vacuum degree, when heating reaches the outdoor temperature of setting in centrifugal chamberWhen, further increase temperature
Degree i.e. starting refrigeration machine metering pump, after running smoothly after a period of time, freon consumption is L (L/h), then different vacuum degrees
Corresponding quantity of heat production can be calculated by the following formula down, look into the physical parameter of refrigerant, density p, boiling point and difference under different pressures
Latent heat of vaporization q under pressure.
Then kJ/h
The quantity of heat production of high speed rotor in this way is exactly QIt is latent, therefore the quantity of heat production of high speed rotor can be by testing, being calculated.
Above-mentioned specific embodiment is used to illustrate the present invention, rather than limits the invention, of the invention
In spirit and scope of protection of the claims, to any modifications and changes that the present invention makes, protection model of the invention is both fallen within
It encloses.
Claims (6)
1. geotechnical centrifuge windage quantity of heat production test device under a kind of vacuum environment, it is characterised in that: hold external pressure shell
(21) it is provided with band thermal insulation layer vacuum cavity (4), center is installed on the high speed rotor (5) in thermal insulation layer vacuum cavity (4) and turns
The upper end of axis (23), the lower end of central rotating shaft (23) is by being mounted on the sealing system with thermal insulation layer vacuum cavity (4) bottom
(22) it is connected with driving motor (1) output shaft held in external pressure shell (21), the upper cover of the upper end with thermal insulation layer vacuum cavity (4)
(2) center and the side with thermal insulation layer vacuum cavity (4) are respectively equipped with temperature sensor (8), two temperature sensors (8)
It is connected to temperature control driver (10), temperature control driver (10) is connected to metering pump (18)；The bottom of refrigerant storage tank (15) and meter
The import of amount pump (18) is connected, and the outlet of metering pump (18) is connected with one end of valve (19), the other end of valve (19)
It is extend into band thermal insulation layer vacuum cavity (4) by conveying pipe of refrigerant, defeated with the refrigerant in thermal insulation layer vacuum cavity (4)
Pipe (17) are sent to be equipped with two or more refrigerant spray heads (20)；Upper cover (2) and hold external pressure shell (21) with open fastly hinge (6) company
It connects, band thermal insulation layer vacuum cavity (4) is connect with vacuum pump (2).
2. geotechnical centrifuge windage quantity of heat production test device under a kind of vacuum environment according to claim 1, special
Sign is: the band thermal insulation layer vacuum cavity (4), and surrounding is held between external pressure shell (21) and protecting against shock liner (24) equipped with heat-insulated
Material (25), the upper cover (26) and hold between external pressure shell (21) be equipped with gasket seal (27).
3. geotechnical centrifuge windage quantity of heat production test device under a kind of vacuum environment according to claim 1, special
Sign is: the refrigerant storage tank (15), and top is equipped with pressure gauge (12) and refrigerant fills mouth (13), and refrigerant fills mouth
(13) it is equipped with and fills a mouthful valve (14) between refrigerant storage tank (15), refrigerant storage tank (15) has thermal insulation layer (29) outside.
4. geotechnical centrifuge windage quantity of heat production test device under a kind of vacuum environment according to claim 1, special
Sign is: described two or more refrigerant spray heads (20) are close to the side wall with thermal insulation layer vacuum cavity (4).
5. it is used for the method that geotechnical centrifuge windage quantity of heat production is tested under a kind of vacuum environment described in claim 1,
It is characterized in that, includes the following steps:
High speed rotor (5) a) are fixed on to the upper end of central rotating shaft (23) by lock-screw (7), shut band thermal insulation layer vacuum chamber
The upper cover (26) of body (4), lock-screw is tightened；
B) vacuum pump (2) are opened, the vacuum values of setting will be evacuated down to thermal insulation layer vacuum cavity (4), keep the vacuum degree one
After the section time, opens driving motor (1), high speed rotor (5) is made to reach the revolving speed of setting；
C) certain heat can be generated during high speed rotor (5) and windage, when temperature sensor (8) detects temperature
When starting to increase, driving measuring pump (18) injects refrigerant in band thermal insulation layer vacuum cavity (4), when refrigerant is in band thermal insulation layer
In vacuum cavity (4) when evaporation, absorb heat, make temperature of the band in thermal insulation layer vacuum cavity (4) keep and vacuum cavity outside
Temperature is the same；
D) after high speed rotor (5) are run, the heat of generation and the heat of injection refrigerant suction reach balance, at this time recording gauge
The reading for measuring pump calculates the heat of high speed rotor (5) generation according to this reading.
6. the method refrigerant of high speed centrifugation rotor quantity of heat production is tested under a kind of vacuum environment according to claim 5,
Be characterized in that: the refrigerant be have the characteristics that lower than room temperature vaporization heat absorption refrigerant, be R22, R134a, R407c,
R410A, R600a, R12 or carbon dioxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810579061.6A CN108981969B (en) | 2018-06-07 | 2018-06-07 | Device and method for testing air friction heat generation capacity of geotechnical centrifuge in vacuum environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810579061.6A CN108981969B (en) | 2018-06-07 | 2018-06-07 | Device and method for testing air friction heat generation capacity of geotechnical centrifuge in vacuum environment |
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| CN108981969A true CN108981969A (en) | 2018-12-11 |
| CN108981969B CN108981969B (en) | 2023-07-25 |
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| CN201810579061.6A Active CN108981969B (en) | 2018-06-07 | 2018-06-07 | Device and method for testing air friction heat generation capacity of geotechnical centrifuge in vacuum environment |
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Cited By (2)
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| CN110940438A (en) * | 2019-12-16 | 2020-03-31 | 浙江大学 | Multi-heat-source heat production testing device in centrifugal cabin of super-gravity centrifugal machine |
| CN116068417A (en) * | 2022-12-05 | 2023-05-05 | 江苏拓米洛高端装备股份有限公司 | Battery heating value determining method and device and test box |
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| CN116068417B (en) * | 2022-12-05 | 2023-12-29 | 江苏拓米洛高端装备股份有限公司 | Battery heating value determining method and device and test box |
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| CN108981969B (en) | 2023-07-25 |
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