CN115474408A - Pump drive loop system provided with unidirectional conduction unit - Google Patents

Abstract

The invention discloses a pump driving loop system provided with a one-way conduction unit, which relates to the field of high-power electronic cooling and is characterized by comprising a pumping loop and the one-way conduction unit, wherein the pumping loop comprises a driving pump, a preheater, an evaporator and a condenser, and the one-way conduction unit consists of a Tesla valve; the unidirectional flux unit includes first unidirectional flux unit and second unidirectional flux unit, the driving pump sets up the pre-heater with between the condenser, the pre-heater with pass through between the evaporimeter first unidirectional flux unit links to each other, the evaporimeter with pass through between the condenser the second unidirectional flux unit links to each other. Based on the one-way flow characteristic of the Tesla valve, the invention can inhibit the return flow of working media in the evaporator and the condenser, and improve the rewetting efficiency, thereby promoting the improvement of the heat exchange capability and effectively inhibiting the instability of the system.

Description

Pump drive loop system provided with unidirectional conduction unit

Technical Field

The invention relates to the field of high-power electronic cooling, in particular to a pump drive loop system provided with a one-way conduction unit.

Background

The rapid progress of microcomputer technology accelerates the development of electronic products toward miniaturization and integration. The extremely high integrated electronic device also faces the heat dissipation requirement of 1000W/cm2, which brings a serious test to the heat dissipation technology. Therefore, conventional cooling technologies cannot meet the heat dissipation requirements, and it is urgent to design a miniature heat sink with small size, light weight, high heat transfer efficiency, and compact structure. Among them, the two-phase microchannel pump driving circuit has become a mainstream solution for solving the above-mentioned heat dissipation problem due to its ultra-high heat exchange performance and simple and compact structural characteristics. However, the working medium in the channel of the two-phase heat exchanger often has a backflow phenomenon, namely flow instability. Flow instability in the heat exchanger can trigger critical heat flux in advance and even burn out electronic devices.

Developing a pump drive loop system that can prevent working medium backflow would be the most straightforward way to inhibit flow instability. Therefore, those skilled in the art are dedicated to develop a pump-driving loop system configured with a one-way conduction unit, wherein a tesla valve is connected in series with the upstream of the evaporator and the condenser, and the backflow of the working medium in the evaporator and the condenser is effectively inhibited by virtue of the characteristic of high reverse flow resistance of the tesla valve, so as to achieve the effects of improving the heat exchange performance and stability of the pump-driving loop system. In addition, the invention provides a parallel Tesla valve structure, which can further organize the flow gradient and optimize the one-way circulation characteristic, thereby achieving the effect of improving the heat exchange capacity and stability of the system.

Disclosure of Invention

In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is how to effectively suppress the backflow of the working medium of the pump-drive circuit system and improve the heat exchange performance and stability of the pump-drive circuit system.

In order to achieve the above object, the present invention provides a pump driving loop system configured with a one-way conduction unit, which is characterized by comprising a pumping loop and the one-way conduction unit, wherein the pumping loop comprises a driving pump, a preheater, an evaporator and a condenser, and the one-way conduction unit comprises a tesla valve; the unidirectional flux unit includes first unidirectional flux unit and second unidirectional flux unit, the driving pump sets up the pre-heater with between the condenser, the pre-heater with pass through between the evaporimeter first unidirectional flux unit links to each other, the evaporimeter with pass through between the condenser the second unidirectional flux unit links to each other.

Further, the cooling device also comprises a cooling unit, and the cooling unit is connected with the condenser.

Further, the cooling unit is a water-cooled unit or an air-cooled unit.

Further, the first one-way conduction unit is formed by connecting 1 to 50 tesla valves in parallel, the second one-way conduction unit is formed by connecting 1 to 50 tesla valves in parallel, and each tesla valve is provided with a tesla valve inlet and a tesla valve outlet.

Further, a tesla valve inlet of the first one-way conduction unit is connected with the preheater, and a tesla valve outlet of the first one-way conduction unit is connected with the evaporator.

Furthermore, the tesla valve inlet of the second one-way conduction unit is connected with the evaporator, and the tesla valve outlet of the second one-way conduction unit is connected with the condenser.

Further, the first one-way conduction unit is connected in series with the front end of the evaporator, and the second one-way conduction unit is connected in series with the front end of the condenser.

Further, the tesla valve has a channel width of 10 to 1000 μm, a channel aspect ratio of 1 to 10, an interior angle of 15 to 75 degrees, and a tube length of 100 to 2000 μm.

Further, the liquid storage unit comprises a liquid storage tank and a buffer tank, the buffer tank is connected with the preheater and the pipeline between the first one-way conduction units, and the liquid storage tank is connected with the condenser and the pipeline between the driving pumps.

Further, the buffer tank comprises a buffer tank inlet, a buffer tank outlet, a heating device and a heat insulation material, wherein the heating device is used for controlling the outer wall of the buffer tank to be at a constant temperature.

The beneficial effects of the invention include:

1. the invention provides a pump driving loop system provided with a one-way conduction unit, when the heat flux density is smaller, a single-branch Tesla valve single-phase conduction unit is formed, and the return flow of working media in an evaporator and a condenser is reduced by utilizing the characteristic of large reverse flow resistance of the single-branch Tesla valve single-phase conduction unit, so that the effect of inhibiting the instability of the loop system is achieved; when the heat flow density is higher, a parallel Tesla valve structure is formed to reduce the branch flow, further reorganize the flow gradient, reduce the upstream flow resistance and simultaneously inhibit the backflow effect of the evaporator and the condenser in the flow boiling and flow condensing processes, which is beneficial to improving the stability and the heat exchange capability of the pump driving loop system.

2. According to the Tesla valve provided by the invention, the flow direction of the horizontal flow channel is consistent with that of the pump driving loop, so that the pressure drop loss caused by the change of the flow position of the traditional Tesla valve structure is favorably reduced.

3. The heating device is arranged on the outer layer of the buffer tank to control the wall temperature, so that the gas in the buffer tank can be effectively ensured to meet the isothermal condition, and the pressure in the buffer tank can be determined.

4. The pump driving loop system provided with the one-way conduction unit can effectively solve the key problem of flow instability in the driving return flow of the two-phase pump, and is not limited to a specific evaporator type, so that the method for inhibiting the flow instability in the driving return flow of the pump based on the Tesla valve has wider application significance.

The conception, specific structure and technical effects of the present invention will be further described in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention.

Drawings

FIG. 1 is a schematic flow diagram of a pump drive circuit system with a unidirectional flux unit according to a preferred embodiment of the present invention;

FIG. 2 is a schematic diagram of a buffer tank of a pump-driving circuit system configured with a unidirectional conducting unit according to a preferred embodiment of the present invention;

FIG. 3 is a schematic diagram of a Tesla valve structure of a pump drive circuit system configured with a unidirectional flux unit according to a preferred embodiment of the present invention;

FIG. 4 is a schematic diagram illustrating the effect of the number of Tesla valve rings on the pressure difference between the buffer tank and the evaporator outlet in a pump drive circuit system equipped with a unidirectional flux unit according to a preferred embodiment of the present invention;

the system comprises a liquid storage tank 1, a driving pump 2, a preheater 3, a buffer tank 4, a buffer tank inlet 41, a buffer tank outlet 42, a heating device 43, a heat insulation material 44, a first one-way conduction unit 5, an evaporator 6, a second one-way conduction unit 7, a condenser 8, a cooling unit 9, a Tesla valve inlet 10 and a Tesla valve outlet 11.

Detailed Description

The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.

In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.

As shown in fig. 1, the present invention discloses a pump drive loop system configured with a unidirectional conducting unit, which includes a liquid storage unit, a pumping loop, a unidirectional conducting unit and a cooling unit; the liquid storage unit comprises a liquid storage tank 1 and a buffer tank 4, the liquid storage tank 1 is subjected to temperature control to regulate and control the system operation pressure, the buffer tank 4 mainly bears the compressible volume of the system, and the fluctuation of the supply pressure is reflected through the change of the gas volume based on the constant temperature condition; the pumping unit consists of a driving pump 2, a preheater 3, a one-way conduction unit, an evaporator 6 and a condenser 8, working media are supplied to the system through the driving pump 2, and heat exchange is completed in the evaporator 6 and the condenser 8; the one-way conduction unit consists of tesla valves connected in parallel, the one-way circulation characteristic of the one-way conduction unit is fully utilized, the backflow of working media in the evaporator 6 and the condenser 8 is inhibited, and the stability and the heat exchange capability of the system are further improved; the cooling unit mainly comprises a cooling unit 9, the cooling unit 9 comprises a water-cooled unit or an air-cooled unit, the cooling unit 9 is connected with the condenser 8, and the heat of the internal circulation is transferred to the external environment by utilizing the external circulation. The pump driving loop system is skillfully provided with the one-way conduction unit, so that the effects of improving the stability and the heat exchange performance of the system can be achieved, and in addition, based on the one-way circulation characteristic of the Tesla valve, the invention can inhibit the return flow of working media in the evaporator 6 and the condenser 8 and improve the rewetting efficiency, thus promoting the improvement of the heat exchange capacity and effectively inhibiting the instability of the system. In addition, the parallel structure of the Tesla valves provided by the invention can adjust the flow distribution, which is beneficial to further optimizing the flow gradient and enhancing the heat transfer performance.

The invention aims to provide a pump drive loop system provided with a one-way conduction unit, and the technical scheme is that a Tesla valve unit is arranged at the upstream of an evaporator 6 and a condenser 8, and the Tesla valve unit can form a parallel structure, so that the flow gradient is reasonably organized, the one-way conduction characteristic is optimized, and the flow instability characteristic of the two-phase pump drive loop system is restrained by regulating and controlling the flow gradient. In addition, the Tesla valve is a passive one-way flow element, has the advantages of simple structure and low cost, can optimize flow distribution by forming the Tesla valve into a parallel structure, can organize flow gradient more effectively, and further inhibits flow instability, thereby being beneficial to promoting the development of a heat dissipation technology of a high-power electronic device and breaking through the bottleneck of the heat dissipation technology of the electronic device.

In order to achieve the purpose, the technical scheme of the invention is as follows: a pump drive loop system provided with a one-way conduction unit is characterized by consisting of a liquid storage unit, a pumping loop, the one-way conduction unit and a cooling unit; the liquid storage unit consists of a liquid storage tank 1 and a buffer tank 4, and as shown in fig. 2, the buffer tank 4 consists of a buffer tank inlet 41, a buffer tank outlet 42, a heating device 43 and a heat insulation material 44; the pump sending back route is composed of a driving pump 2, a preheater 3, an evaporator 6 and a condenser 8; the one-way conduction unit consists of a Tesla valve in a parallel structure and comprises a first one-way conduction unit 5 and a second one-way conduction unit 7, and the Tesla valve consists of a Tesla valve inlet and a Tesla valve outlet; the cooling unit is formed by a cooling unit 9 into an external cooling cycle. Aiming at the problem that the pump drive loop system is unstable in flow due to possible backflow in the flowing boiling and flowing condensing processes of the evaporator 6 and the condenser 8, the invention provides the pump drive loop system configured with the one-way conduction unit, which is formed by connecting the first one-way conduction unit 5 in series in front of the evaporator 6 and connecting the second one-way conduction unit 7 in series in front of the condenser, wherein the flowing resistance characteristic of a Tesla valve can be utilized to reorganize the flowing gradient so as to inhibit the backflow of working media in the evaporator 6 and the condenser 8, and the stability and the heat exchange capability of the pump drive loop system are improved. The invention can also organize the flow gradient rationally to optimize the unidirectional conduction characteristic, when the density of heat flux is smaller, can pass the single branch tesla valve unit, on the basis of its characteristic that the resistance is big in the reverse flow, and reduce the return flow of working medium in evaporator 6 and condenser 8, and then reach the function of inhibiting the loop system from losing stability; when the heat flow density is larger, the invention provides a structure of utilizing the parallel Tesla valves to reduce the branch flow, further reorganize the flow gradient, reduce the upstream flow resistance and simultaneously inhibit the backflow effect of the evaporator 6 and the condenser 8 in the flow boiling and flow condensing processes, thus effectively inhibiting the backflow of working media in the evaporator 6 and the condenser 8 and achieving the effects of improving the heat exchange performance and stability of the pump driving loop system.

The surge tank 4 is a key indicator for quantitative assessment of compressible volume in a two-phase pump drive circuit. In addition, the present invention uses the heating device 43 to control the wall temperature of the buffer tank 4, and determines the pressure according to the gas volume in the buffer tank 4 based on the assumption of isothermal temperature, and at the same time, it can reverse the working medium return flow in the evaporator 6 by detecting the pressure in the buffer tank 4.

Tesla valves are characterized by having both forward and reverse flow typical modes of operation. When working medium flows forward, the flow resistance is far smaller than that brought by the counter-flow of the working medium. As shown in fig. 3, the tesla valve has 6 key parameters, including horizontal tube length L1, inclined tube length L2, internal angle α, channel width d, channel depth h, and tesla valve ring number N. The channel width is 10 to 1000 μm, the channel aspect ratio is 1 to 10, the internal angle is 15 ° to 75 °, the tube length is 100 to 2000 μm, and the number of tesla valve rings is 1 to 50.

The main implementation of the pump driving system equipped with the unidirectional flux unit may be configured as a parallel unidirectional flux unit through a tesla valve, and the implementation and the working procedure will be specifically explained below.

In this case, the unidirectional conduction unit is designed in a manner that the tesla valves are arranged at the front ends of the evaporator 6 and the condenser 8, and the operating condition has the advantages that the unidirectional circulation of the tesla valves is utilized, so that the flow resistance is not obviously increased on one hand, and the backflow of working media in the evaporator 6 and the condenser 8 is inhibited by utilizing the characteristic of large reverse flow resistance on the other hand. For this case, as shown in fig. 4, the present invention calculates in detail the influence of the number of tesla valve rings on the backflow suppression effect under the working condition, the introduction of the tesla valve can play a role in reducing the oscillation amplitude and the oscillation period, and the effect of the oscillation suppression characteristic is more obvious as the number of tesla valve rings increases. The condition that the device is burnt due to no liquid replenishing for a long time in the evaporator 6 can be effectively avoided by a small oscillation period, and the low oscillation amplitude means that the fluctuation amplitude of the wall surface temperature is smaller, namely the surface temperature uniformity of the electronic device is improved. Therefore, the unidirectional conducting unit provided by the invention can effectively weaken the instability characteristic of the system. In addition, the one-way circulation unit designed by the invention is of a parallel Tesla valve structure, when the heat flow density is higher, the flow of the branch circuit can be reduced by using the parallel structure, so that the flow gradient is reorganized, the upstream flow resistance is reduced, and the backflow effect of the evaporator 6 and the condenser 8 in the flow boiling and flow condensing processes is inhibited at the same time, which is beneficial to improving the stability and the heat exchange capability of the pump driving loop system.

In addition, above-mentioned operating mode all wraps up heating device 43 in buffer tank 4 outer wall to make buffer tank 4 outer wall be in constant temperature all the time through PID control heating power. Therefore, the invention establishes the coupling relation between the return flow and the pressure in the buffer tank 4, namely the return flow can be calculated by detecting the pressure in the buffer tank 4, and the pressure in the buffer tank 4 can be reversely deduced by detecting the return flow of the working medium in the evaporator 6.

The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concept. Therefore, the technical solutions that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection determined by the claims.

Claims (10)

1. A pump drive loop system configured with a one-way conduction unit is characterized by comprising a pump loop and the one-way conduction unit, wherein the pump loop comprises a drive pump, a preheater, an evaporator and a condenser, and the one-way conduction unit comprises a Tesla valve; the unidirectional flux unit includes first unidirectional flux unit and second unidirectional flux unit, the driving pump sets up the pre-heater with between the condenser, the pre-heater with pass through between the evaporimeter first unidirectional flux unit links to each other, the evaporimeter with pass through between the condenser the second unidirectional flux unit links to each other.

2. A pump drive circuit system configured with a unidirectional flux unit as recited in claim 1, further comprising a cooling unit, said cooling unit being coupled to said condenser.

3. A pump drive circuit system configured with a unidirectionally conducting unit according to claim 2, wherein said cooling unit is a water-cooled unit or an air-cooled unit.

4. A pump drive circuit system configured with unidirectional conducting units, as claimed in claim 1, wherein said first unidirectional conducting unit is comprised of 1 to 50 said tesla valves connected in parallel, and said second unidirectional conducting unit is comprised of 1 to 50 said tesla valves connected in parallel, each of said tesla valves having a tesla valve inlet and a tesla valve outlet.

5. A pump drive circuit system configured with a one-way conduction unit according to claim 4, wherein the Tesla valve inlet of the first one-way conduction unit is connected with the preheater, and the Tesla valve outlet of the first one-way conduction unit is connected with the evaporator.

6. A pump drive circuit system equipped with a unidirectional flux unit as claimed in claim 4, wherein the Tesla valve inlet of said second unidirectional flux unit is connected with said evaporator and the Tesla valve outlet of said second unidirectional flux unit is connected with said condenser.

7. The pump drive circuit system configured with the unidirectional flux unit as claimed in claim 1, wherein the first unidirectional flux unit is connected in series to a front end of the evaporator, and the second unidirectional flux unit is connected in series to a front end of the condenser.

8. A pump drive circuit system provided with a unidirectional flux unit according to claim 4, wherein the Tesla valve has a channel width of 10 to 1000 μm, a channel aspect ratio of 1 to 10, an internal angle of 15 to 75 degrees, and a tube length of 100 to 2000 μm.

9. The pump drive circuit system configured with the unidirectional flux unit as claimed in claim 1, further comprising a liquid storage unit, wherein the liquid storage unit comprises a liquid storage tank and a buffer tank, the buffer tank is connected to the pipeline between the preheater and the first unidirectional flux unit, and the liquid storage tank is connected to the pipeline between the condenser and the drive pump.

10. The pump drive circuit system configured with the unidirectional flux cell as recited in claim 9, wherein the buffer tank comprises a buffer tank inlet, a buffer tank outlet, a heating device for controlling an outer wall of the buffer tank at a constant temperature, and a thermal insulation material.

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