CN111998707A - Multi-parallel branch stabilizing device and method for two-phase cooling system - Google Patents
Multi-parallel branch stabilizing device and method for two-phase cooling system Download PDFInfo
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- CN111998707A CN111998707A CN202010919278.4A CN202010919278A CN111998707A CN 111998707 A CN111998707 A CN 111998707A CN 202010919278 A CN202010919278 A CN 202010919278A CN 111998707 A CN111998707 A CN 111998707A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
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- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
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Abstract
The invention belongs to the technical field of cooling equipment, and discloses a multi-parallel branch stabilizing device and a method for a two-phase cooling system, wherein the device comprises a control unit, a monitoring unit, a flow regulating unit and a cold plate with a heat load of each branch, and pipelines: the control unit determines a corresponding driving control signal for adjusting the flow adjusting unit according to the temperature on the branch; the monitoring unit collects the flow and the temperature of the branch where the monitoring unit is located and feeds the flow and the temperature back to the control unit; the flow regulating unit controls the flow of the two-phase cooling working medium of the branch according to the driving control signal; the cold plate is provided with two-phase cooling flow passages; the pipeline connects the flow regulating unit, the monitoring unit and the cold plate with the heat load of each branch to form a two-phase working medium passage connected in parallel. By adopting the invention, the problems of uneven flow distribution and unstable flow caused by unbalanced heat load of the multiple parallel branches of the two-phase cooling system can be solved through the functions of inlet throttling, flow regulation and the like, and each branch is prevented from being burnt out due to overhigh temperature.
Description
Technical Field
The invention belongs to the technical field of cooling equipment, and particularly relates to a multi-parallel branch stabilizing device and method for a two-phase cooling system.
Background
With the continuous improvement of chip technology and performance, the heat flux density and heat consumption of the chip are also improved, and miniaturization, multi-point heat source, high heat consumption and high heat flux density become the main challenges of system heat management. The two-phase flow heat dissipation technology has become one of the heat dissipation methods of the key research in the industry due to its small volume and high heat exchange efficiency.
In the two-phase cooling system, if the heat loads of a plurality of parallel branches are the same, the amount (gasification rate) of the two-phase cooling working medium changed from liquid to gas on each branch is basically the same, the flow resistances on the branches are basically the same, and the flow of the system is kept balanced. However, if the thermal load on one branch is lower than that on the other branch, the vaporization rate of the branch is reduced, the flow resistance is reduced, so that the two-phase working medium flows more to the branch with the small thermal load, the flow of the other branches with the high thermal load is reduced, the heat exchange capacity of the branches is reduced, and finally the thermal load can be damaged due to overhigh temperature. The flow of the multi-path parallel two-phase cooling working medium is equal in pressure when the flow of each branch is changed due to the parallel connection, and the flow cannot be adjusted through the pressure transmitter.
Extensive research and review of large scale boiling instability has been conducted by a number of scholars (see references [1] to [5 ]). Boiling instabilities that occur in conventional channels can be classified according to the generation mechanism into dynamic instabilities and static instabilities. The dynamic instability mainly reflects the interaction between the control parameters (pressure, mass flow rate, temperature). The two-phase flow stability experiment is an important aspect of the two-phase flow basic theory research, the problem of the two-phase flow stability causes great attention of people, and at present, many researches on system instability at home and abroad are already carried out. The yellow army et al (see reference [6]) have studied the influence factors of the flow instability of the parallel channels, such as the upstream compressible volume, the system pressure, the supercooling degree, the inlet throttling, the mass flow rate, the heat flow density, the outlet steam content, the outlet superheat degree, etc., and as a result, it has been found that the occurrence of such instability can be suppressed by the increase of the density wave type pulsation, the system pressure, the inlet throttling and the mass flow rate, and the stability of the system can be improved by the decrease of the upstream compressible volume, the outlet throttling and the inlet supercooling degree.
The above references are as follows:
[1]Y.Ding，S.Kakac，X.J.Chen，Dynamic instability of boiling two phase flow in a single horizontal channel，Exp.Therm.Fluid Sci.11(1995)327-342.
[2]H.Yuncu，O.T.Yildirim，S.Kakac，Two-phase flow instabilities in a horizontal single boiling channel，Appl.Sci.Res.48(1991)83-104.
[3]J.A.Boure，A.E.Bergles，L.S.Tong，Review of two-phase flow instability，Nucl.Eng.Des.25(1973)165-192.
[4]Q.Wang，X.J.Chen，S.Kakac，Y.Ding，Boiling onset oscillation：a new type of dynamic instability in a forced-convection upflow boiling system，Int.J.Heat FluidFlow 17(1996)418-423.
[5]A.E.Bergles，Burnout in boiling heat transfer.Part O：high-quality forced-convection systems，Accident Anal.20(1979)671-689.
[6] yellow army, yellow lysine, royal lu. study of parallel channel flow instability [ J ]. power engineering, 2005, 25 (01): 116-120.
Disclosure of Invention
The invention aims to: aiming at the defects of the prior art, the device and the method for stabilizing the multiple parallel branches of the two-phase cooling system are provided, the problems of uneven flow distribution and unstable flow caused by unbalanced heat load of the multiple parallel branches of the two-phase cooling system can be solved through functions of inlet throttling, flow regulation and the like, and each branch is prevented from being burnt out due to overhigh temperature.
Specifically, the invention is realized by adopting the following technical scheme.
In one aspect, the invention provides a multi-parallel branch stabilizing device for a two-phase cooling system, which comprises a control unit, a monitoring unit, a flow regulating unit, a cold plate with a thermal load and a pipeline, wherein the monitoring unit, the flow regulating unit and the cold plate are arranged on each branch:
the control unit is used for determining corresponding driving control signals for adjusting the flow adjusting unit according to the flow and temperature monitoring signals on each branch;
the monitoring unit is used for acquiring flow and temperature monitoring signals on the branch and feeding back the flow and temperature monitoring signals to the control unit;
the flow regulating unit is used for controlling the flow of the two-phase cooling working medium of the branch according to the driving control signal provided by the control unit;
the cold plate with the heat load is provided with two-phase cooling flow channels;
the pipeline connects the flow regulating unit, the monitoring unit and the cold plate with the heat load of each branch to form a two-phase working medium passage connected in parallel;
the control unit comprises a signal processor and a driving controller;
the signal processor is used for converting the flow and temperature monitoring signals of the branch collected by the monitoring unit into collected flow and temperature data; acquiring flow regulation signals according to a preset control table, and outputting corresponding driving control signals for regulating the flow regulation units, wherein the preset control table comprises the flow and the temperature of each branch circuit when the two-phase cooling system meets the requirement of a stable state, and the flow regulation signals corresponding to the flow and temperature data acquired by each branch circuit;
the drive controller adjusts the flow rate adjusting unit according to the drive control signal.
Further, the preset control table contains normal flow data and pulsating flow data;
the normal flow data is used for judging whether the flow of a plurality of parallel branches of the two-phase cooling system reaches a stable state;
the pulsating flow data is pulse type flow data larger than normal flow, and the driving control signal corresponding to the pulsating flow data is used for adjusting the flow adjusting unit when the two-phase cooling system generates air plug.
Furthermore, the multi-parallel branch stabilizing device of the two-phase cooling system further comprises a resistance adjusting element which is arranged at the liquid supply port of the cold plate on each branch and is used for pre-adjusting the single-phase flow resistance of the liquid supply port of the cold plate on each branch so as to be larger than the resistance change of the two-phase cooling working medium on the cold plate caused by small disturbance.
Furthermore, the single-phase flow resistance of the two-phase cooling working medium on the flow regulating unit and the resistance regulating element exceeds half of the total system flow resistance, and the total system flow resistance is at least the sum of the single-phase flow resistance on the flow regulating unit, the single-phase flow resistance on the resistance regulating element, the flow resistance on the cold plate and the flow resistance of the pipeline.
On the other hand, the invention also provides a multi-parallel branch stabilizing method of the two-phase cooling system, which is realized by adopting the multi-parallel branch stabilizing device of the two-phase cooling system and comprises the following steps:
the monitoring unit transmits the flow and temperature monitoring signals of each branch to the control unit;
the control unit carries out monitor control and flow control to the heat load temperature of each branch road and flow signal branch road one by one, includes:
judging whether the heat load temperature and the flow signal of the branch meet the requirement of a stable state:
if the temperature and the flow meet the requirements, judging whether the heat load temperature and the flow signal of the next branch meet the requirements or not until the two-phase cooling system is shut down and the control flow of the multi-parallel branch stabilizing device of the two-phase system is finished;
if either the temperature or the flow does not meet the requirement, starting the two-phase cooling system to stop the protection, and ending the control process of the multi-parallel branch stabilizing device of the two-phase system;
and if the temperature and the flow are not satisfied, adjusting the flow adjusting unit of the branch to ensure that the temperature of the branch reaches the requirement of the stable state.
Furthermore, before the monitoring unit transmits the flow and temperature monitoring signals of each branch to the control unit, the multi-parallel branch stabilizing device for starting the two-phase cooling system after the two-phase cooling system is started for a specified time is further included.
Further, the flow and temperature monitoring signals at least comprise heat load temperature and flow on the branch.
In another aspect, the present invention further provides a multi-parallel branch stabilizing device for a two-phase cooling system, including a monitoring unit, a resistance adjusting element, a cold plate with a thermal load, and a pipeline, where the monitoring unit, the resistance adjusting element, and the cold plate are disposed in each branch:
the monitoring unit is used for acquiring flow and temperature monitoring signals on the branch where the monitoring unit is located;
the resistance adjusting element is arranged at the liquid supply port of the cold plate on each branch road and is used for pre-adjusting the single-phase flow resistance of the liquid supply port of the cold plate on each branch road so as to be larger than the resistance change of the two-phase cooling working medium on the cold plate caused by micro disturbance;
the cold plate with the heat load is provided with two-phase cooling flow channels;
the pipeline connects the monitoring units of the branches, the resistance adjusting elements and the cold plate with the heat load to form a two-phase working medium passage connected in parallel.
In another aspect, the present invention further provides an electronic device, including a memory and a processor, where the processor and the memory complete communication with each other through a bus; the memory stores program instructions executable by the processor, the processor invoking the program instructions to enable the two-phase cooling system multi-parallel branch stabilization method described above to be performed.
In yet another aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the multi-parallel branch stabilization method for the two-phase cooling system.
The invention has the following beneficial effects:
by adopting the multi-parallel branch stabilizing device and the method of the two-phase cooling system, the flow resistance of the two-phase working medium is adjusted in real time by the flow adjusting unit according to the driving control signal provided by the control unit, so that the flow of the two-phase cooling working medium of the branch is controlled, and meanwhile, the flow adjusting unit is not sensitive to the tiny resistance change of the branch by improving the control threshold value of the control table preset in the control unit; therefore, the invention not only can keep the flow stability of the two-phase cooling system when the thermal load of the branch is unbalanced, solve the problem of uneven flow distribution caused by the unbalanced thermal load of the two-phase cooling system, but also can not influence the normal work of other branches when the local branch has unstable flow or small resistance change. The resistance adjusting element is arranged on the liquid supply port of each branch, the liquid supply resistance of each branch is adjusted in advance, the single-phase resistance of each branch is larger than the resistance change of the two-phase working medium caused by slight heat load change, the flow fluctuation of the two-phase cooling system caused by slight resistance change is reduced, and the resistance adjusting element has the function of inlet throttling; therefore, the invention can also ensure that the two-phase cooling system tends to be stable by adjusting the flow of the two-phase cooling system without changing the normal operation condition of the two-phase cooling system when the two-phase cooling system with high dryness or low flow rate has unstable flow such as air lock, periodic fluid disturbance and the like, thereby greatly improving the robustness of a plurality of parallel branches of the two-phase cooling system. In conclusion, the invention provides an effective way for solving the instability problem in the engineering application of the two-phase cooling system. The invention also provides a simple and effective way for solving the problems of single branch resistance fluctuation and unstable flow when the thermal loads of all branches are consistent.
Drawings
Fig. 1 is a schematic diagram of a multi-parallel branch stabilization device of a two-phase cooling system according to embodiment 1 of the present invention.
Fig. 2 is a schematic view of a monitoring control loop of a multi-parallel branch stabilizing device of a two-phase system in embodiment 1 of the present invention.
Fig. 3 is a schematic diagram of a multi-parallel branch stabilization device of a two-phase cooling system in embodiment 2 of the present invention.
Fig. 4 is a schematic diagram of a multi-parallel branch stabilization device of a two-phase cooling system in embodiment 3 of the present invention.
Fig. 5 is a schematic control flow diagram of a multi-parallel branch stabilizing device of a two-phase system according to an embodiment of the present invention.
The labels in the figure are: the system comprises a control unit 1, a flow regulating unit 2, a monitoring unit 3, a resistance regulating element 4, a cold plate with a heat load 5, a pipeline 6, a signal control line 7, a flow sensor 8, a temperature sensor 9, a collecting plate 10, a signal processor 11 and a driving controller 12.
Detailed Description
The present invention will be described in further detail with reference to the following examples and the accompanying drawings.
Example 1:
the embodiment of the invention relates to a multi-parallel branch stabilizing device and a multi-parallel branch stabilizing method for a two-phase cooling system, which are used for solving the problem of instability of the multi-parallel branch of the two-phase cooling system.
As shown in fig. 1, the multi-parallel branch stabilizing device of the two-phase cooling system of the present embodiment includes a control unit 1, a flow rate adjusting unit 2, a monitoring unit 3, a cold plate 5 with a heat load, and a pipeline 6. The composition of each branch is the same, and each branch comprises a flow regulating unit 2, a monitoring unit 3 and a cold plate 5 with a heat load.
And the control unit 1 is used for processing the flow and temperature monitoring signals on each branch, determining flow control information corresponding to temperature information or temperature change information from a preset control table according to the flow and temperature data, and controlling the flow regulating unit 2. The control table includes the nonlinear corresponding relation between the temperature of each branch monitoring point and the flow on the branch. The flow regulating signal of the preset control meter comprises a normal flow signal and a pulsating flow signal; the normal flow signal is used for judging whether the flow of a plurality of parallel branches of the two-phase cooling system reaches a stable state; the pulsating flow signal is a pulse type flow signal larger than the normal flow, and a driving control signal corresponding to the pulsating flow signal is used for adjusting the flow adjusting unit 2 when the two-phase cooling system generates an air lock.
The flow regulating unit 2 is used for controlling the flow of the two-phase cooling working medium of the branch according to a driving control signal corresponding to the pulsating flow signal provided by the control unit 1, the flow regulating unit 2 realizes flow regulation by regulating the flow resistance of the two-phase working medium of the branch, and the flow of the two-phase cooling system is kept stable when the thermal load of the branch is unbalanced, so that the problems of uneven flow distribution, branch air plugs and the like caused by unbalanced thermal load of the two-phase cooling system are solved. The flow regulating unit 2 realizes dynamic real-time regulation of flow, and the flow regulating unit 2 can be arranged on each branch. The flow regulating unit 2 is insensitive to the tiny resistance change of the branch by improving the control threshold of the control table preset in the control unit 1, and the normal work of other branches is not influenced when the local branch generates unstable flow or the tiny resistance change. The flow regulating unit 2 can be generally realized by various valves such as a flow regulating valve, a constant flow valve, a proportional regulating valve and the like, and the flow regulation is realized by regulating the opening degree (namely the circulating pipe diameter) and the bypass flow through an electric or manual mode.
The monitoring unit 3 is composed of a plurality of sensors such as a flow sensor 8 and a temperature sensor 9, and an acquisition board 10, and is used for monitoring the flow and temperature change on each branch and feeding back the flow and temperature information to the control unit 1. The sensors include, but are not limited to, a flow sensor 8, a temperature sensor 9, and a pressure sensor. The acquisition board 10 acquires and processes signals of various sensors into a unified signal, and uploads the unified signal to the control unit 1. The flow and temperature monitoring signals of the monitoring unit 3 may include branch flow, total flow, heat load temperature, cold plate temperature, temperature of the pipeline 6 near the heat load, and the like, at least the heat load temperature and the flow on the branch.
The cold plate 5 with the heat load consists of a heating element and a cold plate, the cold plate is provided with a two-phase cooling flow channel, and the heating element is a cooled object of a two-phase cooling system, namely the heat load.
And the pipeline 6 is used for connecting the flow regulating unit 2, the monitoring unit 3 and the cold plate 5 with the heat load of each branch to form a two-phase working medium passage connected in parallel. Two-phase cooling working media flow in the passage, the cold plate transfers heat on a heat load (heating elements such as various heating chips) to the two-phase cooling working media, and the cooling working media absorb heat through phase change in the cold plate to realize heat dissipation of the heat load; the two-phase working medium which is subjected to phase change takes away heat through the pipeline 6.
As shown in fig. 2, the monitoring unit 3, the control unit 1, and the flow rate adjusting unit 2 are connected by a signal control line 7 to form a monitoring control loop.
The control unit 1 includes a signal processor 11 and a drive controller 12.
The signal processor 11 is used for processing the flow and temperature monitoring signals of the branch collected by the monitoring unit 3 and converting the flow and temperature monitoring signals into collected flow and temperature data; acquiring flow regulating signals according to a preset control table, and outputting corresponding driving control signals for regulating the flow regulating unit 2, wherein the preset control table comprises the flow and the temperature of each branch circuit when the two-phase cooling system meets the requirement of a stable state, and the flow regulating signals corresponding to the flow and temperature data acquired by each branch circuit; the drive controller 12 adjusts the flow rate adjustment unit 2 according to the drive control signal.
The preset control table contains flow control signals corresponding to monitoring signals of flow and temperature changes, and flow data in the control table is divided into two types: one is normal flow and one is pulsating flow. The normal flow data is used for judging whether the flow of a plurality of parallel branches of the two-phase cooling system reaches a stable state; the drive control signal corresponding to the pulsating flow data is used to adjust the flow adjusting unit 2 when the two-phase cooling system suffers from an air lock. The normal flow and the pulsating flow are data obtained by theoretical calculation and experimental test in advance. The normal flow calculation is calculated according to the law of conservation of energy and the gasification rate of the two-phase cooling working medium. The pulsating flow is large flow in a period of time and needs to be determined according to actual tests, namely the minimum flow which needs to break the balance of the air plug when the air plug occurs in two-phase cooling is tested, and the pulsating flow is larger than or equal to the normal flow theoretically. Unstable flow such as an air plug of a two-phase cooling system needs to pass through a large flow rate to destroy the instability, so that the orientation of the heat load temperature is stable. After the system is recovered to be stable, the branch flow can be recovered to be normal flow. And the preset control table compares the obtained monitoring signals of temperature, flow and the like with the preset normal temperature and normal flow signals, judges whether the state of each branch meets the requirement or not, and generates a flow regulating signal for the flow of the branch according to the state of the branch.
When one or more branches of the two-phase cooling system generate unstable flow such as air lock or periodic fluid disturbance, the temperature of the heat load rises to exceed the limit value, the control unit 1 receives signals such as temperature and flow collected by the monitoring unit 3, and controls the flow regulating unit 2 according to corresponding pulsating flow in a preset control table, so that the flow regulating unit 2 reduces or improves the flow resistance of the two-phase cooling working medium flow, the flow of the unstable flow branches is changed, and the temperature of the heat load is recovered to a normal state.
Example 2:
another embodiment of the present invention is basically the same as the structure of embodiment 1, except that a resistance adjusting element 4 is further provided on the liquid supply port of each branch.
As shown in fig. 3, the multi-parallel branch stabilizing device of the two-phase cooling system of the present embodiment includes a control unit 1, a flow rate adjusting unit 2, a monitoring unit 3, a resistance adjusting element 4, a cold plate 5 with a heat load, and a pipeline 6. The composition of each branch is the same, and each branch comprises a flow regulating unit 2, a monitoring unit 3, a resistance regulating element 4 and a cold plate 5 with a heat load.
The resistance adjusting element 4 of each branch corresponds to the flow rate adjusting unit 2.
The resistance adjusting element 4 is used for pre-adjusting the single-phase flow resistance of each branch, so that the single-phase flow resistance of each branch is far larger than the resistance change of the two-phase working medium caused by slight thermal load change, and the flow fluctuation of the two-phase cooling system caused by slight resistance change is reduced. The resistance adjusting element 4 is a non-dynamic resistance adjusting element and has an inlet throttling function, so that system flow fluctuation caused by small resistance change is reduced. When the high-dryness or low-flow-rate two-phase cooling system has unstable flow such as air lock, periodic fluid disturbance and the like, the normal operation condition of the two-phase cooling system is not changed, the two-phase cooling system tends to be stable by adjusting the flow of the two-phase cooling system, the robustness of a plurality of parallel branches of the two-phase cooling system is greatly improved, and an effective solution is provided for the instability problem in the engineering application of the two-phase cooling system.
As shown in fig. 3, the pipeline 6 is used for connecting the flow regulating unit 2, the monitoring unit 3, the resistance regulating element 4 and the cold plate 5 with heat load of each branch to form a two-phase working medium passage connected in parallel. Two-phase cooling working media flow in the passage, the cold plate transfers heat on a heat load (heating elements such as various heating chips) to the two-phase cooling working media, and the cooling working media absorb heat through phase change in the cold plate to realize heat dissipation of the heat load; the two-phase working medium which is subjected to phase change takes away heat through the pipeline 6.
Example 3:
another embodiment of the present invention has a structure substantially the same as that of embodiment 2, except that a flow rate adjusting unit is not used to adjust the flow rate of the two-phase working medium in each branch, but a resistance adjusting element 4 is disposed on the liquid supply port of each branch for pre-adjusting the single-phase flow resistance of each branch, so that the single-phase flow resistance in each branch is far greater than the resistance change of the two-phase working medium caused by slight thermal load change, thereby reducing the flow fluctuation of the two-phase cooling system caused by slight resistance change.
As shown in fig. 4, the multi-parallel branch stabilizing device of the two-phase cooling system of the present embodiment includes a monitoring unit 3, a resistance adjusting element 4, a cold plate 5 with a heat load, and a pipeline 6. The composition of each branch is the same, and each branch comprises a monitoring unit 3, a resistance adjusting element 4 and a cold plate 5 with a heat load. As shown in fig. 3, the pipeline 6 is used for connecting the monitoring unit 3, the resistance adjusting element 4 and the cold plate 5 with heat load of each branch to form a two-phase working medium passage in parallel. Two-phase cooling working media flow in the passage, the cold plate transfers heat on a heat load (heating elements such as various heating chips) to the two-phase cooling working media, and the cooling working media absorb heat through phase change in the cold plate to realize heat dissipation of the heat load; the two-phase working medium which is subjected to phase change takes away heat through the pipeline 6.
The resistance adjusting element 4 is used for pre-adjusting the single-phase flow resistance of each branch, so that the single-phase flow resistance of each branch is far larger than the resistance change of the two-phase working medium caused by slight thermal load change, and the flow fluctuation of the two-phase cooling system caused by slight resistance change is reduced. The resistance adjusting element 4 is a non-dynamic resistance adjusting element and has an inlet throttling function, so that system flow fluctuation caused by small resistance change is reduced. When the thermal loads of all branches are consistent, namely the thermal load of one branch is not inconsistent with that of other branches, the structure of the embodiment can solve the problems of single branch resistance fluctuation and unstable flow.
Further, the embodiment may further include a display device and a storage device, which are respectively used for displaying and storing the flow and temperature monitoring data of the branch where the temperature monitoring device is located.
Example 4:
the embodiment provides a method for stabilizing multiple parallel branches of a two-phase cooling system, which is implemented by using the device for stabilizing multiple parallel branches of a two-phase cooling system in embodiment 1 or 2, and the method comprises the following steps:
the monitoring unit 3 transmits the flow and temperature monitoring signals of each branch to the control unit 1.
The control unit 1 carries out monitoring control and flow regulation on the heat load temperature and the flow signal branch of each branch one by one. As shown in fig. 5, taking the kth branch as an example, the monitoring, controlling and flow-rate adjusting the thermal load temperature and the flow-rate signal branch of each branch includes:
judging the heat load temperature T of the kth branchkAnd a flow signal QkWhether the requirement of the stable state is met or not is judged, namely whether the two-phase cooling system is in the unstable state or not is judged:
if the temperature and the flow both meet the requirement of the steady state, judging the heat load temperature T of the next branch (the k +1 th branch)k+1And a flow signal Qk+1Whether the requirement of the stable state is met or not is judged until a shutdown signal of the two-phase cooling system is obtained, and the control flow of the multi-parallel branch stabilizing device of the two-phase system is finished;
if the temperature does not meet the requirement of the stable state, but the flow meets the requirement of the stable state, the two-phase cooling system needs to be shut down to check the system state, the two-phase cooling system is started to be shut down for protection, and the control flow of the multi-parallel branch stabilizing device of the two-phase system is ended;
if the temperature meets the requirement of the stable state, but the flow does not meet the requirement of the stable state, the temperature sensor 9 may break down, at this time, the two-phase cooling system also needs to be shut down to check the system state, the two-phase cooling system is started to be shut down for protection, and the control flow of the multi-parallel branch stabilizing device of the two-phase system is ended;
if the temperature and the flow do not meet the requirement of the stable state, the flow regulating unit 2 of the pulsating flow regulating branch in the preset control table is used for enabling the flow of the kth branch to meet the flow requirement when the flow of the kth branch is pulsating.
The temperature and the flow rate of the two-phase cooling system are not stable during the starting period, and in order to prevent the multi-parallel branch stabilizing device of the two-phase cooling system from generating misjudgment on the change of the temperature and the flow rate during the period, the multi-parallel branch stabilizing device of the two-phase cooling system can be started after the starting time (generally within 60 seconds) of the two-phase cooling system. When the two-phase cooling system is started, the two-phase cooling system multi-parallel branch stabilizing device receives a two-phase cooling system starting signal, and after the two-phase cooling system multi-parallel branch stabilizing device receives the starting signal, the two-phase cooling system multi-parallel branch stabilizing device is started again after a certain time.
By adopting the multi-parallel branch stabilizing device and method of the two-phase cooling system, the flow resistance of the two-phase cooling working medium in the two-phase cooling system is controlled by the two-phase cooling system through the flow regulating unit 2 and the resistance regulating element 4, and the single-phase flow resistance of the two-phase cooling working medium on the flow regulating unit 2 and the resistance regulating element 4 is more than half of the total system flow resistance, so that the occupation ratio of the plate resistance in the two-phase cooling system is controllable and adjustable. The total system flow resistance is at least the sum of the single-phase flow resistance on the flow regulating unit 2, the single-phase flow resistance on the resistance regulating element 4, the flow resistance on the cold plate and the flow resistance of the line 6. Therefore, the influence of the small fluctuation of the resistance in the cold plate on the resistance of the branch is reduced under the control of the resistance adjusting element 4, the two-phase flow of the branch is not greatly changed, but is changed in a controllable range, and the robustness of the branch is improved.
When one or more branches of the two-phase cooling system generate unstable flow such as air lock or periodic fluid disturbance, the temperature of the heat load rises to exceed the limit value, the control unit 1 receives signals such as temperature and flow collected by the monitoring unit 3, and controls the flow regulating unit 2 according to corresponding pulsating flow in a preset control table, so that the flow regulating unit 2 reduces or improves the flow resistance of the two-phase cooling working medium flow, the flow of the unstable flow branches is changed, and the temperature of the heat load is recovered to a normal state.
The multi-parallel branch stabilizing device and method for the two-phase cooling system, provided by the invention, can not only keep the flow of the system stable when the thermal load of the branch is unbalanced, but also solve the problem of uneven flow distribution caused by unbalanced thermal load of the two-phase cooling system; meanwhile, when the local branch circuit has unstable flow or small resistance change, the normal work of other branch circuits is not influenced; and when the high-dryness or low-flow-rate two-phase system has unstable flow such as air plug and periodic fluid disturbance, the normal operation condition of the system is not changed, the flow of the system is adjusted, the system tends to be stable, the robustness of multiple parallel branches of the two-phase cooling system is greatly improved, and an effective solution is provided for the instability problem in the engineering application of the two-phase cooling system.
In some embodiments, certain aspects of the techniques described above may be implemented by one or more processors of a processing system executing software. The software includes one or more sets of executable instructions stored or otherwise tangibly embodied on a non-transitory computer-readable storage medium. The software may include instructions and certain data that, when executed by one or more processors, manipulate the one or more processors to perform one or more aspects of the techniques described above. The non-transitory computer-readable storage medium may include, for example, a magnetic or optical disk storage device, a solid state storage device such as flash memory, cache, Random Access Memory (RAM), etc., or other non-volatile memory device. Executable instructions stored on a non-transitory computer-readable storage medium may be in source code, assembly language code, object code, or other instruction format that is interpreted or otherwise executed by one or more processors.
A computer-readable storage medium may include any storage medium or combination of storage media that is accessible by a computer system during use to provide instructions and/or data to the computer system. Such storage media may include, but is not limited to, optical media (e.g., Compact Discs (CDs), Digital Versatile Discs (DVDs), blu-ray discs), magnetic media (e.g., floppy disks, tape, or magnetic hard drives), volatile memory (e.g., Random Access Memory (RAM) or cache), non-volatile memory (e.g., Read Only Memory (ROM) or flash memory), or micro-electromechanical systems (MEMS) -based storage media. The computer-readable storage medium can be embedded in a computing system (e.g., system RAM or ROM), fixedly attached to a computing system (e.g., a magnetic hard drive), removably attached to a computing system (e.g., an optical disk or Universal Serial Bus (USB) based flash memory), or coupled to a computer system via a wired or wireless network (e.g., Network Accessible Storage (NAS)).
Note that not all of the activities or elements in the general description above are required, that a portion of a particular activity or device may not be required, and that one or more further activities or included elements may be performed in addition to those described. Still further, the order in which the activities are listed need not be the order in which they are performed. Moreover, these concepts have been described with reference to specific embodiments. However, one of ordinary skill in the art appreciates that various modifications and changes can be made without departing from the scope of the present disclosure as set forth in the claims below. Accordingly, the specification and figures are to be regarded in an illustrative rather than a restrictive sense, and all such modifications are intended to be included within the scope of present disclosure.
Benefits, other advantages, and solutions to problems have been described above with regard to specific embodiments. However, the benefits, advantages, solutions to problems, and any feature(s) that may cause any benefit, advantage, or solution to occur or become more pronounced are not to be construed as a critical, required, or essential feature of any or all the claims in any or all respects. Moreover, the particular embodiments disclosed above are illustrative only, as the disclosed subject matter may be modified and practiced in different but equivalent manners apparent to those skilled in the art having the benefit of the teachings herein. No limitations are intended to the details of construction or design herein shown, other than as described in the claims below. It is therefore evident that the particular embodiments disclosed above may be altered or modified and all such variations are considered within the scope of the disclosed subject matter. Accordingly, the protection sought herein is as set forth in the claims below.
Claims (10)
1. The utility model provides a many parallelly connected branch road stabilising arrangement of two-phase cooling system which characterized in that, includes the control unit, monitoring unit, the flow control unit that every branch road set up and take the cold drawing of heat load to and the pipeline:
the control unit is used for determining corresponding driving control signals for adjusting the flow adjusting unit according to the flow and temperature monitoring signals on each branch;
the monitoring unit is used for acquiring flow and temperature monitoring signals on the branch and feeding back the flow and temperature monitoring signals to the control unit;
the flow regulating unit is used for controlling the flow of the two-phase cooling working medium of the branch according to the driving control signal provided by the control unit;
the cold plate with the heat load is provided with two-phase cooling flow channels;
the pipeline connects the flow regulating unit, the monitoring unit and the cold plate with the heat load of each branch to form a two-phase working medium passage connected in parallel;
the control unit comprises a signal processor and a driving controller;
the signal processor is used for converting the flow and temperature monitoring signals of the branch collected by the monitoring unit into collected flow and temperature data; acquiring flow regulation signals according to a preset control table, and outputting corresponding driving control signals for regulating the flow regulation units, wherein the preset control table comprises the flow and the temperature of each branch circuit when the two-phase cooling system meets the requirement of a stable state, and the flow regulation signals corresponding to the flow and temperature data acquired by each branch circuit;
the drive controller adjusts the flow rate adjusting unit according to the drive control signal.
2. The multi-parallel branch stabilization device for two-phase cooling system according to claim 1, wherein the preset control table contains normal flow data and pulsating flow data;
the normal flow data is used for judging whether the flow of a plurality of parallel branches of the two-phase cooling system reaches a stable state;
the pulsating flow data is pulse type flow data larger than normal flow, and the driving control signal corresponding to the pulsating flow data is used for adjusting the flow adjusting unit when the two-phase cooling system generates air plug.
3. The multi-parallel branch stabilizing device for the two-phase cooling system according to claim 1, further comprising a resistance adjusting element disposed at the liquid supply port of the cold plate on each branch for pre-adjusting the single-phase flow resistance of the liquid supply port of the cold plate on each branch to be greater than the resistance change of the two-phase cooling medium on the cold plate caused by the minor disturbance.
4. The multi-parallel branch stabilization device for two-phase cooling system according to claim 3, wherein the single-phase flow resistance of the two-phase cooling medium on the flow rate adjustment unit and the resistance adjustment element exceeds half of the total system flow resistance, and the total system flow resistance is at least the sum of the single-phase flow resistance on the flow rate adjustment unit, the single-phase flow resistance on the resistance adjustment element, the flow resistance on the cold plate, and the flow resistance of the pipeline.
5. The utility model provides a two-phase cooling system is parallelly connected branch road stabilising arrangement more which characterized in that, includes the cold drawing that monitoring unit, resistance adjusting element and the area heat load that every branch road set up, and the pipeline:
the monitoring unit is used for acquiring flow and temperature monitoring signals on the branch where the monitoring unit is located;
the resistance adjusting element is arranged at the liquid supply port of the cold plate on each branch road and is used for pre-adjusting the single-phase flow resistance of the liquid supply port of the cold plate on each branch road so as to be larger than the resistance change of the two-phase cooling working medium on the cold plate caused by micro disturbance;
the cold plate with the heat load is provided with two-phase cooling flow channels;
the pipeline connects the monitoring units of the branches, the resistance adjusting elements and the cold plate with the heat load to form a two-phase working medium passage connected in parallel.
6. A two-phase cooling system multi-parallel branch stabilizing method is realized by the two-phase cooling system multi-parallel branch stabilizing device according to any one of claims 1 to 4, and is characterized by comprising the following steps:
the monitoring unit transmits the flow and temperature monitoring signals of each branch to the control unit;
the control unit carries out monitor control and flow control to the heat load temperature of each branch road and flow signal branch road one by one, includes:
judging whether the heat load temperature and the flow signal of the branch meet the requirement of a stable state:
if the temperature and the flow meet the requirements, judging whether the heat load temperature and the flow signal of the next branch meet the requirements or not until the two-phase cooling system is shut down and the control flow of the multi-parallel branch stabilizing device of the two-phase system is finished;
if either the temperature or the flow does not meet the requirement, starting the two-phase cooling system to stop the protection, and ending the control process of the multi-parallel branch stabilizing device of the two-phase system;
and if the temperature and the flow are not satisfied, adjusting the flow adjusting unit of the branch to ensure that the temperature of the branch reaches the requirement of the stable state.
7. The method as claimed in claim 6, further comprising activating the multi-parallel branch stabilization device after a specified time period has elapsed since the two-phase cooling system is activated, before the monitoring unit transmits the flow and temperature monitoring signals of each branch to the control unit.
8. The method of claim 6, wherein the flow and temperature monitoring signals comprise at least a heat load temperature and a flow rate on the branch.
9. An electronic device, comprising a memory and a processor, wherein the processor and the memory communicate with each other via a bus; the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the method of any of claims 6 to 8.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 6 to 8.
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