CN112871475A - Efficient energy-saving temperature control method and device for large-scale high-G-value centrifugal machine - Google Patents
Efficient energy-saving temperature control method and device for large-scale high-G-value centrifugal machine Download PDFInfo
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Abstract
The invention provides a high-efficiency energy-saving temperature control method of a large-scale high-G value centrifuge, which utilizes the pressure difference generated by the gas in a centrifugal chamber on the wall of the chamber when the centrifuge rotates to be higher than the center of the chamber, the gas enters a heat exchange chamber under the pressure difference, is absorbed by heat and cooled by a high-efficiency heat exchanger and then flows back to the centrifugal chamber to circularly cool so as to control the safe working temperature Safe, reliable, economical and feasible temperature control of the large-scale supergravity centrifugal machine.
Description
Technical Field
The invention relates to the technical field of centrifuge equipment, in particular to a high-capacity high-G-value simulation test centrifuge, which relates to industrial applications such as simulation tests in national geotechnical, civil, aerospace and marine engineering projects and petrochemical engineering, supergravity separation, mass transfer and reaction strengthening technologies, new material development and the like, in particular to a steady-state acceleration simulation test equipment centrifuge, and relates to the problems of high efficiency, energy conservation, temperature control, safety guarantee and test result correctness in a centrifuge simulation test device.
Background
The technology of the hypergravity centrifugal machine is developed in the seventies of the last century, and China is successively subjected to cooperative tracking and innovation with foreign countries, so that a plurality of large and medium-sized centrifugal machine simulation test devices are built.
With the increase of the capacity of the centrifugal machine, the huge centrifugal machines generate great resistance and heat when running at high speed in the cavity of the centrifugal machine, in order to ensure the safe operation and the correct test of the equipment, research departments of various countries specially research the temperature control system technology of the hypergravity centrifugal machine, simultaneously perform CFD flow field simulation calculation on the hypergravity centrifugal machine and perform air cooling and liquid cooling practical tests by utilizing the existing unit and design and manufacture simulation devices, obtain a series of results, lay the foundation for a higher-capacity hypergravity project, more than 200 sets of large and medium-sized devices are built at home and abroad, the national institute approves that the international hypergravity centrifugation simulation and experiment device (1900g.T) with the largest capacity is built at present, and the centrifugal acceleration reaches 1500g.
Along with the improvement of centrifugal acceleration and volume weight of the supergravity centrifugal machine, the wind resistance power generated in the test is greatly increased, for example, the wind resistance power N is considered by the institute of engineering and physics in Chinaw＝ρc(1-α)2ω3Psi/2 (where rho is air density and omega is basket rotation speed) (Zhengxiang, equipment environment engineering, 17 th volume, 3 rd year 2020 and 3 month), which is basically consistent with the opinion wind resistance power of various research units at home and abroad in the prior art, because the test requirement needs to be carried out at room temperature of 40 ℃, the heat transfer cooling for removing wind resistance power by the centrifugal units at home and abroad to solve the problem of over-temperature of the centrifugal machine mainly adopts an air cooling method, which is successful and effective for small and medium-sized devices, the most common mode is a forced air cooling mode, namely, an air inlet and an air outlet are arranged in a centrifugal machine room, and the heat is transferred into the centrifugal machine room through the air inletThe air quantity is brought out by natural ventilation of air, but the problem is caused to a larger centrifuge, as the ventilation pipeline required by ventilation under normal pressure is very large, such as a Japanese PWR1 earthwork machine, only 2 ventilation pipes with the diameter of 4.4M are required for air exhaust, the external standby investment is large, and the air inlet and outlet machine room brings great disturbance, which affects the stability of the high-speed operation of the centrifuge, as the wind resistance power is increased along with the large-scale high G value of the centrifuge, the structure of the centrifuge cabin is firstly ensured to be reasonable, the strength is safe and reliable enough, the temperature is strictly controlled under the high-speed and high-gravity acceleration experiment, if the overtemperature can cause the failure of part of key elements of a collection test system and a control system, which affects the accuracy of the data of the experiment result, the control system causes the equipment to run out of control, and the consequence is beyond imagination, China institute of engineering physics in patent CN111389601, the existing centrifuge room has a, the heat generated by the friction between the rotating arm of the existing centrifuge and air usually adopts a natural ventilation mode, and the specific method is to arrange an air inlet hole or an air outlet hole on a ceiling or a floor of a machine room, the mode has obvious effect on the low-rotating-speed geotechnical centrifuges, but the heat generated by the friction can be greatly improved when the rotating speed of the geotechnical centrifuges is higher, and the natural ventilation mode is often difficult to control the indoor temperature rise of the machine. The invention discloses a new temperature control method, aims to realize the world of centrifugal simulation technology with higher capacity and larger centrifugal forceThe boundary edge.
The Chinese institute of engineering and physics performs CFD simulation on static pressure cloud, speed cloud and temperature cloud in a centrifuge chamber of a plurality of built and built centrifuges in China, for example, in the indoor air pressure cloud analysis article of the TLT-1000G centrifuge CFD, the static pressure of the inner wall of the chamber reaches 106300Pa, the increase of the static pressure is 4975Pa compared with the normal pressure value, and the center of the chamber is-93310 Pa (see Yi Yihui and the like, "analysis of air pressure and natural exhaust in the chamber of a rotating arm type centrifuge," Mianyang academy of academic, 11 months in 2018, 1-6, "Yi text).
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a temperature control method and a temperature control device for a large-scale supergravity centrifugal machine, which are high-efficiency, energy-saving, safe, reliable, economical and feasible, by utilizing the generated static pressure difference and adopting a high-efficiency heat exchanger according to the operation characteristics and rules of the centrifugal machine.
A high-efficiency energy-saving temperature control method for a large-scale high-G-value centrifuge is characterized in that during simulation test of the centrifuge, a rotating arm in the centrifuge with a hanging basket rotates at high speed to drive air to rub with a wall of a centrifuge to generate high heat rise temperature, and high temperature t exceeding the design temperature of the centrifuge test is causedHThe invention adopts the method of internal circulation heat exchange temperature control by adopting the pressure difference generated by the gas in the closed centrifuge under the rotation of the centrifuge, the centrifugal machine is divided into a centrifugal chamber and a heat exchange chamber, a partition board is arranged between the centrifugal chamber and the heat exchange chamber, an air inlet hole for air to enter the heat exchange chamber from the centrifugal chamber is arranged on the position of the clapboard close to the chamber wall, an air return hole for air to return to the centrifugal chamber from the heat exchange chamber is arranged in the center of the clapboard, the inclined opening direction of the air inlet is consistent with the rotation direction of the rotating arm of the centrifuge, the air in the centrifuge chamber generates a pressure difference higher than the center of the engine room on the wall of the engine room when the centrifuge rotates, and gas enters the heat exchange chamber under the pressure difference, the heat exchanger is arranged in the heat exchange chamber, the gas flows through the heat exchanger, is absorbed by a coolant in the heat exchange tube and is cooled to a low temperature, then flows back to the centrifugal chamber for testing, and then enters the heat exchange chamber again for circulating cooling to control the safe working temperature.
When the centrifuge runs stably, the air in the chamber is at the circular velocity, so that the air inlet from the centrifugal chamber partition plate to the heat exchange chamber is an inclined opening, and the opening direction is the same as the rotation direction of the centrifuge.
The gas velocity passing through the heat exchanger is 1-10 m/s.m by adjusting the number and the diameter of the air inlet holes and the air return holes2The high-temperature gas in the centrifugal chamber flows to the heat exchange chamber through the air inlet hole on the partition plate close to the chamber side wall, the high-temperature gas flows to the centrifugal chamber from outside to inside centripetally through the micro-channel heat exchanger, is cooled by the heat absorption of the refrigerant in the heat exchange tube, and then returns to the centrifugal chamber through the air return hole close to the center of the rotating shaft, and the high-temperature gas is circulated according to the circulation to meet the temperature requirement of the design of the centrifugal machine simulation test.
The invention also provides a large-scale high G value centrifuge device suitable for the temperature control method, wherein the centrifuge is internally provided with a central rotating shaft, a rotating arm and a test hanging basket or a balance piece hung at the end part of the rotating arm, the centrifuge device comprises a centrifugal chamber and a heat exchange chamber, the heat exchange chamber is arranged above or below the centrifugal chamber, a partition plate with a return air hole and an air inlet hole is arranged between the centrifugal chamber and the heat exchange chamber, the air inlet hole is positioned on the partition plate and close to the chamber wall, air is supplied to the heat exchange chamber from the centrifugal chamber, and the air inlet holes are symmetrically arranged according to an equal included angle and even number; the air return hole is positioned on the clapboard and close to the center of the rotating shaft, and air is supplied to return to the centrifugal chamber from the heat exchange chamber; when the heat exchange chamber is arranged below the centrifugal chamber, the air return hole is an annular hole, and when the heat exchange chamber is arranged above the centrifugal chamber, the air return hole is a round hole; one or more heat exchangers for cooling the hot gas from the centrifugal chamber are arranged in the heat exchange chamber.
Preferably, the one or more heat exchangers are fin type heat exchangers adopting microchannel shoulder tubes, which are abbreviated as microchannel heat exchangers.
Preferably, the plurality of microchannel heat exchangers are arranged in one or more circles of closed circular rings in the heat exchange chamber.
Preferably, the plurality of microchannel heat exchangers are impeller-shaped microchannel heat exchangers with air barriers, a refrigerant flow dividing pipe at the far center end of each impeller-shaped microchannel heat exchanger is sealed with each air barrier, an opening between a refrigerant collecting pipe at the near center end and each air barrier is communicated with an air return hole in a partition plate, and hot gas entering the heat exchange chamber passes through the pipe surface of each impeller-shaped microchannel heat exchanger and then enters the air return hole through a channel between each impeller-shaped microchannel heat exchanger and each air barrier to return to the centrifugal chamber.
Preferably, the plurality of microchannel heat exchangers are bent into a U shape and then are uniformly distributed in 4, 8 or 16 equal-area areas on the circular section of the heat exchange chamber according to included angles of 90 degrees, 45 degrees or 22.5 degrees, and the U-shaped ends of the microchannel heat exchangers are communicated with the air return holes.
Preferably, the microchannel heat exchanger is a plurality of S-shaped microchannel heat exchangers which are arranged in a closed wavy circular ring in the heat exchange chamber.
Preferably, the diameter of the heat exchange chamber is less than or equal to that of the centrifugal chamber.
When the heat exchange area in the heat exchange chamber is small or other equipment in the heat exchange chamber occupies space, the heat exchanger and other equipment must be separated and isolated independently, so that hot gas can be completely subjected to heat exchange through the heat exchanger.
Compared with the prior art beneficial effect:
the centrifugal machine is adopted to operate in a closed mode, centrifugal force generated by operation of the centrifugal machine is used, the centrifugal machine is close to the wall of a cabin and is higher than pressure difference at the center of the centrifugal machine, a small-pipe-diameter fin heat exchange tube, particularly a micro-channel heat exchanger, of a heat exchange unit in the cabin is designed, refrigerant or secondary refrigerant in the heat exchange tube of the high-efficiency heat exchanger cools gas media of the centrifugal machine between tubes through the tube wall and fins, and the centrifugal machine has:
1. the supergravity is improved, and the high power ratio similarity law simulation good level is achieved.
2. High-efficiency heat exchanger and high-specific heat exchange surface M2/M3High heat transfer efficiency kw/M2DEG C, equipment is light.
3 the heat exchange unit is changed from the outside of the centrifuge to the inside, so that the investment is saved, and the equipment investment is greatly saved due to the fact that the air density is low under normal pressure and the external heat exchange pipeline equipment for oppositely opening the air inlet and outlet is large.
4. The centrifugal static pressure difference is used for replacing a fan, so that the power consumption is saved, the vacuum is replaced at normal pressure, the sealing problem of a large container without vacuum sealing is solved, the energy is saved, the consumption is reduced, and the heat loss and the transmission power of gas outside the centrifugal machine are reduced by heat exchange in the centrifugal machine.
5. The microchannel heat exchange is dispersed and miniaturized, is easy to inspect and repair, is safe and reliable, only exchanges heat with the inner wall compared with the double-layer plate type heat exchange of the wall of a centrifugal machine, does not exchange heat with the outer wall, and improves the effect exponentially.
Drawings
FIG. 1 is a schematic diagram of a centrifuge apparatus having a plurality of microchannel heat exchangers arranged in concentric circles within a heat exchange chamber.
Fig. 2 is a schematic cross-sectional view a-a of the heat exchange chamber of fig. 1.
FIG. 3 is a schematic view of a centrifuge apparatus using an impeller-shaped microchannel heat exchanger in a heat exchange chamber.
Fig. 4 is a schematic cross-sectional view of the heat exchange chamber of fig. 3.
FIG. 5 is a schematic view of a centrifuge apparatus using a plurality of microchannel heat exchangers having U-bends in the heat exchange chamber.
Fig. 6 is a schematic cross-sectional view a-a of the heat exchange chamber of fig. 5.
FIG. 7 is a schematic view of a centrifuge apparatus using a plurality of undulating microchannel heat exchangers in a heat exchange chamber.
Fig. 8 is a schematic cross-sectional view a-a of the heat exchange chamber of fig. 7.
FIG. 9 is a schematic view of a centrifuge apparatus having a heat exchange chamber with a diameter smaller than that of the centrifuge chamber.
Description of the reference numerals
1-machine room wall 2-partition plate 3-heat exchanger 4-rotating shaft
5-hanging basket 6-horizontal rotating arm 7-centrifugal chamber 8-cover plate
9-heat exchange chamber 10-air inlet 11-return air hole 12-refrigerant shunt pipe
13-refrigerant collecting pipe 14-gas baffle 15-refrigerant inlet pipe 16-refrigerant liquid return pipe
17-vacuum pump 18-dryer 19-blower
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples, wherein the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention, i.e., the embodiments described are only a few, but not all, of the embodiments of the invention, the devices and conduits of the embodiments of the invention generally described and illustrated in the drawings herein can be arranged and designed in a variety of different configurations, and the drawings of the specification, fig. 1, fig. 2 and fig. 3, are merely schematic diagrams of the connections of the main device lines, wherein flow meters, such as temperature and pressure components, are not shown on the drawings, the side surfaces of the centrifuge bowl are at different heights, and the gas cooling heat exchanger inlet and outlet, fan inlet and outlet, etc., are positioned as desired.
All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Example 1 schematic cooling temperature control of hot gas centripetal by micro-channel heat exchanger arranged on inner circumference of lower heat exchanger
FIG. 1 is a schematic diagram of a cooling and temperature control device for a large-scale high G-value centrifuge cabin of the present invention, wherein the cabin is mainly composed of a cover plate 8 and a cabin wall 1, the cabin is divided into a centrifugal chamber 7 and a heat exchange chamber 9 from top to bottom, a partition plate 2 is arranged between the centrifugal chamber 7 and the heat exchange chamber 9, an air inlet 10 is arranged on the partition plate 2, the oblique opening direction of the air inlet is consistent with the rotation direction of a rotating arm of the centrifuge, a horizontal rotating arm 6 with two ends hanging a test basket 5 is arranged at the upper part of the centrifugal chamber 7 driven by a bottom motor, the horizontal rotating arm 6 rotates at high speed and generates heat with the gas in the centrifugal chamber 7 to generate wind resistance power, static pressure difference is generated between the wall of an internal machine of the centrifuge cabin and the center of the cabin, the wind resistance power is increased along with the gas density rho of the cabin, the rotating speed w of the basket, the centrifugal acceleration, when the temperature of the test cabin exceeds the designed working temperature, the safety and the correct precision of the analog test are affected, and the test is difficult to complete successfully.
Height proposed by one existing stationFor example, the diameter of the centrifuge is 9 meters, the rotating speed is 668 rpm, the centrifugal machine is analyzed and calculated by CFD (computational fluid dynamics) of professional engineering physical research unit, the centrifugal machine has the gravity acceleration of 1500g, the static pressure of the inner wall of the centrifuge chamber under normal pressure is 35.8KPa, the center is-3.35 KPa, the cross section temperature of the cloud centrifugal chamber is 258K (15 ℃), the inner wall of the chamber is 358K (85 ℃), the wind resistance power is 5317KW under normal pressure 1500g, and the heat exchange surface 117M of a double-layer jacket on the wall of the centrifuge chamber is adopted2A plurality of microchannel heat exchangers shown in the attached figures 1 and 2 are connected front and back to form a closed circumference shape, refrigerant for a refrigeration system R507A is shunted and parallelly connected to enter a shunt tube of each microchannel heat exchanger, and is further shunted to channels with the hydraulic diameter smaller than 3mm of the microchannel heat exchange flat tubes arranged horizontally, the refrigerant is evaporated, evaporated and heat exchanged and then flows to a collecting tube to return to a refrigerator, 40 ℃ hot gas from a centrifugal chamber at the upper part in the figure 1 flows downwards to a heat exchange chamber 9 through an air inlet 10 on a partition plate 2, and the temperature of the hot gas is 1.5M/s.m.m.between the chamber wall and the heat exchangers2The wind speed centripetally passes through the microchannel heat exchange flat tubes and the inter-tube fins, refrigerant R507A in the microchannel heat exchange flat tubes vaporizes and absorbs heat under the pressure of 0.62MPa, the refrigerant is cooled into cold air at the normal pressure of 16 ℃, the air passes through the pressure drop of a heat exchanger of 51Pa, and the cold air cooled to 16 ℃ is collected and returns to the centrifugal chamber through the annular air return hole 11 in the center of the partition plate 2 to continue circulation.
In the centrifugal machine in the figure 1, a centrifugal chamber wall is not used for cooling, so the centrifugal machine is a single-layer cylinder, a side door is arranged on a cylinder body and used for installing equipment and allowing people to go in and out (not shown in the figure), a vacuum pump in the figure is used for performing an air tightness test of vacuumizing equipment by a sealing cover plate after the equipment is finished, when the relative humidity of air is too high in a centrifugal simulation test, the air sent to the centrifugal machine in the test needs to pass through a drier firstly, for example, a molecular sieve is used for absorbing moisture in the air, and the relative humidity of.
FIG. 3 is a view similar to FIG. 1 showing a temperature control device of a centrifuge using a microchannel heat exchanger at the lower part of a partition plate of a centrifugal chamber, an upper centrifugal chamber 7, the partition plate 2 and accessory equipment are similar to those in FIG. 1, but the temperature control device is replaced at the lower part of the partition plate of the centrifugal chamber in the figure and the lower part of the partition plate of the centrifugeThe hot chamber uses a plurality of micro-channel heat exchangers which are connected front and back to form different circumferential heat exchange area heat exchangers, but adopts a plurality of impeller-shaped micro-channel heat exchangers which are arranged according to equal round angles on the cross section, as shown in figure 4, a refrigerant shunt pipe 12 at the far center end of the impeller-shaped micro-channel heat exchanger is sealed with an air baffle plate 14, an opening between a refrigerant manifold 13 at the near center end and the air baffle plate 14 is communicated with a return air hole 11 on a baffle plate 2, the refrigerant shunt pipe 12 entering the near center section of the micro-channel heat exchanger is refrigerated, a plurality of channels with the hydraulic diameter smaller than 3mm of each horizontal heat exchange tube flow into the refrigerant manifold 13 at the near center end, 40 ℃ hot gas entering the heat exchange chamber 9 from a centrifugal chamber 7 through an air inlet 10 on the baffle plate 2 is circumferentially shunted by 2.5M/s.m2The air speed horizontally passes through the surface of the microchannel heat exchange tube, the R507A refrigerant is vaporized under the pressure of 0.626MPa in a flow channel in a flat heat exchange tube, the heat of hot air outside the absorption tube and the cooling hot air of fins are cooled to 19.8 ℃ from 40 ℃, the pressure of the air is reduced by 110Pa through the heat exchanger, and the cold air at 19.8 ℃ returns to an upper centrifugal chamber through a channel air inlet and return hole 11 between a refrigerant collecting pipe 13 and the tail end of a gas baffle plate 14, the centrifugal chamber generates heat when the gas of the centrifugal machine rotates centrifugally, the hot gas flows downwards into a heat exchange chamber 9 through a baffle plate 2 by a chamber wall air inlet hole 10, and the temperature reduction of the impeller-shaped microchannel heat exchanger is performed in an alternating cycle2For example 1 wind resistance power 5317KW, only 92M is needed2The heat exchange area can meet the requirement of controlling the temperature at 40 ℃ under normal pressure.
Example 3 Heat exchanger with heat exchange chamber on top of centrifuge and multiple U-shaped micro-tube channels
The heat exchange chambers in the above embodiments 1 and 2 are both disposed below the centrifugal chamber, and are suitable for the case of opening the lifting port at the top of the centrifugal chamber, and the heat exchange chamber 9 may be disposed above the centrifugal chamber 7 in the case of not providing the lifting port at the top, as shown in fig. 5, the heat exchange chamber 9 is disposed above the centrifugal chamber 7, as shown in fig. 6, the plurality of microchannel heat exchangers are respectively bent into a U-shape, and divided into 16 equal planes on the circular cross section of the heat exchange chamber at an included angle of 22.5 degreesThe accumulation areas are uniformly arranged, the U-shaped ends of the microchannel heat exchangers are communicated with the air return holes 10, the space between the refrigerant shunt pipe 12 and the refrigerant collecting pipe 13 of two adjacent microchannel heat exchangers is sealed, 40 ℃ hot gas in the centrifugal chamber 7 flows upwards into the heat exchange chamber 9 through the air inlet hole 10 on the partition plate 2, and the circumferential shunt is performed at 3.0M/s.m2The wind speed horizontally passes through the surface of a microchannel heat exchange tube, R134A refrigerant is vaporized under the pressure of 0.4MPa in the flow channels of the heat exchange flat tubes, the heat of hot air outside the tubes is absorbed, the hot air is cooled to 24 ℃ from 40 ℃ together with fins, the gas is subjected to pressure drop of 120Pa through a heat exchanger, and cold air at 24 ℃ flows downwards through a round air return hole 11 and returns to a lower centrifugal chamber 7 to perform centrifugal chamber temperature rise and heat exchange chamber temperature reduction alternate circulation heat exchange, the U-shaped micro-tube channel heat exchanger comprises a refrigerant shunt tube 12, a refrigerant collecting tube 13 and a plurality of finned tubes of micro-channel flat tubes, aluminum flat tubes are vertically inserted into the refrigerant shunt tube 12 and the refrigerant collecting tube 13 and are fixed through welding, the micro-tube channel heat exchanger has more compact structure and heat exchange coefficient than a stainless steel micro-tube, so the occupied space and the heat exchange surface can be smaller, the centrifugal machine is mainly used for generating the pressure difference between the position close to, a fan is not needed generally, but a fan and a fan can be arranged to blow air to enhance the cooling effect when necessary.
Example 4 centrifuge device Using wave-shaped Microchannel Heat exchanger
FIGS. 7 and 8 show a centrifuge apparatus using a microchannel heat exchanger at the lower part of a partition plate of a centrifuge chamber in the same manner as in FIG. 1, wherein an upper centrifuge chamber 7, a partition plate 2 and accessory equipment are the same as in FIG. 1, and as shown in FIG. 8, a lower heat exchange chamber 9 is formed by arranging a plurality of S-shaped microchannel heat exchangers in a closed wave circular ring, and hot gas at 40 ℃ from the centrifuge chamber flows downwards into the heat exchange chamber 9 through an air inlet hole 10 in the partition plate 2 and flows into the heat exchange chamber 9 from a space between the chamber wall and the heat exchangers at a flow2Wind speed centripetally passes through the micro-channel heat exchange flat tubes and the fins among the tubes, the refrigerant in the micro-channel heat exchange flat tubes R507A vaporizes to absorb heat, and cooled normal-pressure cold air is collected and returns to the centrifugal chamber through the annular air return hole 11 in the center of the partition plate 2 to continue circulation.
As shown in FIG. 9, the centrifuge device can also be designed such that the diameter of the heat exchange chamber is less than or equal to the diameter of the centrifuge chamber.
The hot gas entering the microchannel heat exchanger is calculated according to 40 ℃ in the calculation of the embodiment, the temperature can be adjusted to be less than 40 ℃ according to the current environmental temperature in an actual centrifugal simulation test, and the heat exchanger in the embodiment 1 can be a large annular ring heat exchanger group or a plurality of concentric circle heat exchanger groups.
According to meteorological data of the past year, if the air temperature of a centrifugal machine construction place in spring and winter is more than 5 ℃, and if the average water temperature is less than 5 ℃, natural water or circulating water can be directly used in the microchannel pipe.
Claims (10)
1. The utility model provides a high-efficient energy-conserving temperature control method of large-scale high G value centrifuge, during centrifuge analogue test, centrifuge inner rotating arm area hanging flower basket high-speed rotation drives air and cabin wall friction and produces high fever rising temperature, arouses the high temperature that surpasss centrifugal test design temperature, its characterized in that: the method adopts the pressure difference generated by the gas in the closed centrifugal machine under the rotation of the centrifugal machine to carry out internal circulation heat exchange and temperature control, the centrifugal machine is divided into a centrifugal chamber and a heat exchange chamber, a partition board is arranged between the centrifugal chamber and the heat exchange chamber, an air inlet hole for air to enter the heat exchange chamber from the centrifugal chamber is arranged on the position of the clapboard close to the chamber wall, an air return hole for air to return to the centrifugal chamber from the heat exchange chamber is arranged in the center of the clapboard, the inclined opening direction of the air inlet is consistent with the rotation direction of the rotating arm of the centrifuge, the air in the centrifuge chamber generates a pressure difference higher than the center of the engine room on the wall of the engine room when the centrifuge rotates, and gas enters the heat exchange chamber under the pressure difference, the heat exchanger is arranged in the heat exchange chamber, the gas flows through the heat exchanger, is absorbed by a coolant in the heat exchange tube and is cooled to a low temperature, then flows back to the centrifugal chamber for testing, and then enters the heat exchange chamber again for circulating cooling to control the safe working temperature.
2. The high-efficiency energy-saving temperature control method of the large-scale high-G value centrifuge according to claim 1, characterized in that: the gas velocity passing through the heat exchanger is 1-10 m/s.m by adjusting the number and the diameter of the air inlet holes and the air return holes2。
3. The high-efficiency energy-saving temperature control method of the large-scale high-G value centrifuge according to claim 1, characterized in that: the heat exchanger is a micro-channel heat exchanger.
4. The utility model provides a large-scale high G value centrifuge device, centrifuge in be equipped with central pivot, rocking arm to and the experimental hanging flower basket or the balancing piece that the rocking arm tip was hung, its characterized in that: the centrifugal machine device comprises a centrifugal chamber and a heat exchange chamber, wherein the heat exchange chamber is arranged above or below the centrifugal chamber, a partition plate with an air return hole and an air inlet hole is arranged between the centrifugal chamber and the heat exchange chamber, the air inlet hole is positioned on the partition plate and close to the chamber wall, air is supplied to the heat exchange chamber from the centrifugal chamber, and the air inlet holes are symmetrically arranged according to an equal included angle and even number; the air return hole is positioned on the clapboard and close to the center of the rotating shaft, and air is supplied to return to the centrifugal chamber from the heat exchange chamber; when the heat exchange chamber is arranged below the centrifugal chamber, the air return hole is an annular hole, and when the heat exchange chamber is arranged above the centrifugal chamber, the air return hole is a round hole; one or more heat exchangers for cooling the hot gas from the centrifugal chamber are arranged in the heat exchange chamber.
5. The large, high-G-value centrifuge apparatus of claim 4, wherein: the heat exchanger or the heat exchangers are fin type heat exchangers adopting micro-channel flat tubes, and are called micro-channel heat exchangers for short.
6. The large high-G-value centrifuge apparatus of claim 5, wherein: the plurality of micro-channel heat exchangers are arranged in the heat exchange chamber to form a circle or a plurality of circles of closed circular rings.
7. The large high-G-value centrifuge apparatus of claim 5, wherein: the plurality of microchannel heat exchangers are impeller-shaped microchannel heat exchangers with air barriers, a refrigerant flow dividing pipe at the far center end of each impeller-shaped microchannel heat exchanger is sealed with each air barrier, and an opening between a refrigerant flow collecting pipe at the near center end and each air barrier is communicated with an air return hole in the partition.
8. The large high-G-value centrifuge apparatus of claim 5, wherein: after the plurality of microchannel heat exchangers are bent into a U shape, the heat exchange chambers are uniformly distributed in 4, 8 or 16 equal-area areas on the circular cross section of the heat exchange chamber according to included angles of 90 degrees, 45 degrees or 22.5 degrees, and the U-shaped ends of the microchannel heat exchangers are communicated with the air return holes.
9. The large high-G-value centrifuge apparatus of claim 5, wherein: the plurality of S-shaped micro-channel heat exchangers are arranged into a closed wavy circular ring.
10. The large high-G-value centrifuge apparatus of claim 5, wherein: the diameter of the heat exchange chamber is less than or equal to that of the centrifugal chamber.
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| CN202110244217.7A CN112871475A (en) | 2021-02-25 | 2021-02-25 | Efficient energy-saving temperature control method and device for large-scale high-G-value centrifugal machine |
| PCT/CN2022/077625 WO2022179550A1 (en) | 2021-02-25 | 2022-02-24 | Efficient energy-saving temperature control method for large-scale high-g-value centrifuge, and apparatus |
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| JPH0289961A (en) * | 1988-09-22 | 1990-03-29 | Hitachi Koki Co Ltd | Temperature control mechanism in cooling centrifugal machine |
| JP2008307219A (en) * | 2007-06-14 | 2008-12-25 | Hitachi Koki Co Ltd | Centrifugal machine |
| CN108525868A (en) * | 2018-04-09 | 2018-09-14 | 浙江大学 | The integrated heat radiating device of hypergravity acceleration high speed geotechnical centrifuge |
| CN210434694U (en) * | 2019-04-09 | 2020-05-01 | 河南省世纪奥科生物技术有限公司 | High-speed refrigerated centrifuge |
| CN210614035U (en) * | 2019-07-11 | 2020-05-26 | 中农华大(武汉)检测科技有限公司 | Animal quarantine is with desk-top high-speed refrigerated centrifuge of fixed test tube of being convenient for |
| CN110302906B (en) * | 2019-07-19 | 2023-07-28 | 浙江大学 | Device and method for reducing wind resistance power of large geotechnical centrifuge |
| CN112871475A (en) * | 2021-02-25 | 2021-06-01 | 杭州林达化工技术工程有限公司 | Efficient energy-saving temperature control method and device for large-scale high-G-value centrifugal machine |
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