A cooling system based on an expandable phase change cooling device and a cooling method thereof

Abstract

The present invention relates to a cooling system and a cooling method based on an expandable phase change cooling device, which belongs to the field of cooling technology for heat dissipation equipment, and solves the problem in the prior art that the continuous increase in equipment power leads to an increase in the volume of the cooling system, but at the same time, the requirements for miniaturization, lightness and low cost of each device are also getting higher and higher. The cooling system of the present invention adopts a two-stage cooling system. When the heat dissipation device is not working, the cooling is performed through the secondary cooling system, and the cold is stored in the phase change material of the energy storage device. A low-power cooling system can be used for cooling. When the heat dissipation device releases heat intermittently and violently, the phase change material in the cold storage device quickly releases cold, and the device is cooled through the primary cooling system. In addition, the energy storage device adopts an expandable phase change cooling device, which can adjust the cold storage capacity according to the cooling needs, reduce the volume of the cooling system, and can be applied to the cooling of equipment with different heat dissipation power and duty cycle.

Description

Technical Field

[0001] The present invention relates to the technical field of heat dissipation systems, and in particular to a cooling system based on an expandable phase change cooling device and a cooling method thereof. Background Art

[0002] Heat generators, heat generator detectors, phased array radars, high-power LEDs and other equipment have intermittent high-power heating. If the heat is not quickly dissipated, it will affect the normal operation of each device. In addition, the heat often has the characteristics of short-term high-power heat dissipation. In order to dissipate the heat, there are many cooling methods. The traditional one is a closed refrigeration circuit system. The previous closed refrigeration circuit system is a double closed circulation system. The heat generator, power pump and heat exchanger form the inner circulation, and the external chiller and heat exchanger form the outer circulation. The heat generated by the existing heat generator is transferred to the chiller through the heat exchanger. In this way, the greater the heat generation, the greater the cooling capacity of the chiller is required.

[0003] As the power of heating elements, phased array radars and high-power LED devices continues to increase, the volume of the cooling system will also increase exponentially, but at the same time, the requirements for miniaturization, lightness and low cost of each device are becoming increasingly higher. In addition, various devices with different uses have different heating powers and heating duty cycles (the ratio of working time to non-working time). For example, the working time of the heat dissipation device is 30s and the non-working time is 30min. Therefore, the required chiller power is also different.

[0004] Therefore, the present invention aims to design an expandable phase change cooling device to meet the heat dissipation requirements of high-power heating equipment and the miniaturization requirements of refrigeration equipment. Summary of the invention

[0005] In view of the above analysis, the present invention aims to provide a cooling system and a cooling method based on a scalable phase change cooling device, so as to solve the problem that as the power of heating elements, phased array radars and high-power LED devices continues to increase, the volume of the cooling system will also increase exponentially, but at the same time, the requirements for miniaturization, lightweight and low cost of each device are also getting higher and higher.

[0006] The purpose of the present invention is mainly achieved through the following technical solutions:

[0007] A cooling system based on an expandable phase change cooling device comprises: a primary cooling system and a secondary cooling system; the primary cooling system comprises: an energy storage device, a power device and a microchannel heat sink; the secondary cooling system can refrigerate and solidify the phase change medium in the energy storage device, and the energy storage device is used to store cold energy; the energy storage device is an expandable phase change cooling device; the power device can drive the coolant to circulate in the energy storage device and the microchannel heat sink; the microchannel heat sink can exchange heat with the heat dissipation device.

[0008] Furthermore, the energy storage device comprises: an inner soft box, a phase change cold storage sheet and an outer box; the inner soft box is provided with a phase change cold storage sheet; and the outer box is sleeved on the outer side of the inner soft box.

[0009] Furthermore, the inner soft box has a folding portion that can be folded or unfolded; the outer box includes: a first box and a second box, the first box is sleeved inside the second box, and the length of the overlapping portion of the first box and the second box is adjustable.

[0010] Furthermore, the secondary cooling system includes: an energy accumulator, a compressor, a condenser and a thermal expansion valve connected in sequence; the compressor can compress the evaporated refrigerant gas in the energy accumulator into a high-temperature and high-pressure gas; the condenser can condense the high-temperature gas into a liquid; the thermal expansion valve can throttle to reduce the liquid temperature; when the secondary cooling system is working: the refrigerant circulates between the energy accumulator, the compressor, the condenser and the thermal expansion valve.

[0011] Furthermore, the coolant outlet of the energy accumulator is connected to the coolant inlet of the microchannel heat sink; one end of the power device is connected to the energy accumulator, and the other end is connected to the microchannel heat sink.

[0012] Furthermore, the power device is a water pump; one end of the water pump is connected to the energy storage device, and the other end is connected to the microchannel heat sink.

[0013] Furthermore, the power device is a high-pressure tank.

[0014] Furthermore, the high-pressure tank includes: a first high-pressure tank and a second high-pressure tank; the first high-pressure tank is connected to the energy storage device through a first branch; the first high-pressure tank is connected to the microchannel heat sink through a second branch; the second high-pressure tank is connected to the energy storage device through a third branch, and the second high-pressure tank is connected to the microchannel heat sink through a fourth branch.

[0015] Furthermore, a first valve is arranged on the first branch, a second valve is arranged on the second branch, a third valve is arranged on the third branch, and a fourth valve is arranged on the fourth branch.

[0016] A cooling method, using the above cooling system based on the scalable phase change cooling device, comprises the following steps:

[0017] Step S1: adjusting the cold storage capacity of the energy storage device according to the heat dissipation of the heat dissipation device;

[0018] Step S2: determining the cooling power and cooling time of the secondary cooling system according to the duty cycle and heat dissipation of the heat dissipation device;

[0019] Step S3: Refrigeration process: the secondary cooling system is in operation, and the phase change medium in the energy storage device solidifies to store cold; cold release process: the primary cooling system is in operation, and the phase change medium in the energy storage device releases cold, and the coolant in the primary cooling system exchanges heat with the heat dissipation device when flowing through the microchannel heat sink, thereby cooling the heat dissipation device.

[0020] The technical solution of the present invention can achieve at least one of the following effects:

[0021] 1. Various heat dissipation devices for different purposes have different heating powers and heating duty cycles (the ratio of working time to non-working time), so the required chiller power is also different. In order to reduce the volume of the cooling system, the present invention uses an energy storage device with a phase change cold storage sheet for cold storage, and uses phase change materials as cold storage media. When the phase change material undergoes a phase change, it absorbs a large amount of heat to provide cooling for each heat dissipation device. The phase change material is made into a sheet shape, which can directly contact the coolant of the primary cooling system, thereby enhancing the heat exchange efficiency and reducing the volume of the refrigeration unit.

[0022] 2. The cooling system of the present invention adopts a two-stage cooling system. When the heat dissipation device is not working, the secondary cooling system is used for cooling. The cold is stored in the phase change material of the energy storage device. A low-power cooling system can be used for cooling. When the heat dissipation device releases heat intermittently and violently, the phase change material in the cold storage device quickly releases cold, and the device is cooled by the primary cooling system. The cooling and cold release of the cooling system of the present invention are not performed at the same time, but are performed alternately, which avoids the influence of the cooling system on the heat dissipation device, reduces the power load of the circuit, prolongs the cooling time, reduces the power required for cooling, and reduces the volume of the cooling system.

[0023] 3. The cooling system of the present invention uses an expandable phase-change cooling device as an energy storage device, which can be applied to cooling heat dissipation devices with different duty cycles, and adjusts the cooling power and cold release power of the cooling system according to the heat dissipation and duty cycle of the heat dissipation device. According to the power of common heating equipment, the present invention can set the chiller to a common power, such as 10Kw, and the energy storage device is in an expandable form, which can adjust the amount of cold storage. While reducing the power and volume of the cooling device, it can also meet the diversified cooling needs of devices with different heating powers and different heating duty cycles, realizing the miniaturization, lightweight and low cost of the entire system.

[0024] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0026] Figure 1 It is a schematic diagram of a cooling system based on a scalable phase change cooling device of the present invention;

[0027] Figure 2 The schematic diagram of the cooling system of the power unit is a water pump;

[0028] Figure 3 It is a schematic diagram of a scalable phase change cooling device;

[0029] Figure 4 It is a schematic diagram of the extended state of the expandable phase change cooling device;

[0030] Figure 5 This is a diagram showing the connection status of the outer box of the expandable phase change cooling device;

[0031] Figure 6 The process of using a high-pressure tank to drive the first-stage cooling system to run forward;

[0032] Figure 7 The reverse operation process of the first-stage cooling system is driven by a high-pressure tank.

[0033] Reference numerals:

[0034] 1-microchannel heat sink; 2-power device; 3-energy storage device; 4-compressor; 5-condenser; 6-thermal expansion valve; 7-first valve; 8-second valve; 9-third valve; 10-fourth valve; 11-first high-pressure tank; 12-second high-pressure tank; 13-fifth valve;

[0035] 31-folding part; 32-inner soft box; 33-phase change cold storage plate; 34-outer box; 35-water supply and return pipe; 341-first box; 342-second box; 343-connecting piece. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0037] Example 1

[0038] A specific embodiment of the present invention discloses a cooling system based on an expandable phase change cooling device, including: a primary cooling system and a secondary cooling system; wherein, the primary cooling system includes: a microchannel heat sink 1, a power device 2 and an energy storage device 3, and the microchannel heat sink 1, the power device 2 and the energy storage device 3 are interconnected, the power device 2 can drive the circulation of coolant between the energy storage device 3 and the microchannel heat sink 1, and the microchannel heat sink 1 can exchange heat with the heat generating device; the secondary cooling system includes: a condenser 5 and the energy storage device 3, the energy storage device 3 stores a phase change medium, and the condenser 5 can cool the phase change medium in the energy storage device 3; the phase change medium is used to store cold.

[0039] In a specific embodiment of the present invention, the energy accumulator 3 is an expandable phase change cooling device, that is, the volume of the energy accumulator 3 is adjustable, and a plurality of phase change cooling sheets 33 are arranged inside the energy accumulator 3. During implementation, the volume of the energy accumulator 3 is adjusted, and the energy accumulator 3 can store different numbers of phase change cooling sheets 33, thereby changing the amount of cold storage in the energy accumulator 3.

[0040] Furthermore, a phase change medium is provided inside the phase change cold storage sheet 33, and the phase change medium can change its physical form by absorbing and releasing heat. The phase change medium inside the phase change cold storage sheet 33 can release heat and solidify under the action of the condenser 5, and can absorb the heat released by the heat dissipation device and liquefy. From the outside, the phase change cold storage sheet 33 does not change its form and is always a sheet structure, and the phase change medium inside it undergoes a phase change.

[0041] The present invention connects the phase change cold storage sheet 33 in the energy storage device 3 to the primary cooling system and the secondary cooling system, and realizes cooling and temperature reduction of the heat dissipation device through the circulation process of the two cooling systems.

[0042] The energy storage device 3 of the present invention is an expandable phase change cooling device. The expandable phase change cooling device has a double-layer structure. The inner layer is made of soft material, and the surface is processed into a threaded shape, which can be folded and retracted. The phase change medium can be paraffin, ice, inorganic salts, etc., or a composite phase change material made by adsorbing paraffin, ice, inorganic salts, etc. with porous media such as foam metal and expanded graphite. When the power of the cooling device needs to be adjusted, the cooling capacity of the cooling device can be adjusted by adjusting the inner and outer volumes of the cooling device.

[0043] In a specific embodiment of the present invention, Figure 1As shown, one end of the microchannel heat sink 1 is connected to the power device 2, and the other end is connected to the energy storage device 3; one end of the power device 2 is connected to the energy storage device 3, and the other end is connected to the microchannel heat sink 1, and the three form a primary cooling system. At the same time, the energy storage device 3 is connected to the secondary cooling system as a heat exchanger, and one end of the condenser 5 is connected to the compressor 4, and the other end is connected to the thermal expansion valve 6; and one end of the energy storage device 3 is connected to the compressor 4, and the other end is connected to the thermal expansion valve 6, and the outlet of the compressor 4 is connected to the condenser 5, forming a secondary cooling system. Specifically, the heat exchange surface of the microchannel heat sink 1 is in contact with the heat dissipation surface of the heat dissipation device, the water outlet of the microchannel heat sink 1 is connected to the power device 2, and the water inlet of the microchannel heat sink 1 is connected to the energy storage device 3, and the power device 2 provides power for the circulation of the primary cooling system.

[0044] During implementation, the primary cooling system and the secondary cooling system work alternately:

[0045] 1) When the heating element system (heat dissipation device) is working, start the primary cooling system.

[0046] The coolant (water or ethylene glycol aqueous solution, etc.) in the primary cooling system flows through the energy accumulator 3, the microchannel heat sink 1 and the power device 2 in sequence; the low-temperature coolant flowing out of the energy accumulator 3 flows into the microchannel heat sink 1, and the low-temperature coolant enters the microchannel heat sink 1 to cool the heat dissipation device. The low-temperature coolant in the microchannel heat sink 1 exchanges heat with the heat dissipation device and then heats up; the heated high-temperature coolant flows back to the energy accumulator 3 under the drive of the power device 2, and the high-temperature coolant flowing back to the energy accumulator 3 exchanges heat with the phase change cold storage plate 33. After the heat exchange, the high-temperature coolant is cooled to a lower temperature in the energy accumulator 3, and at the same time, the phase change medium in the energy accumulator 3 absorbs the heat released by the coolant to undergo a phase change, gradually changing from solid to liquid, thereby realizing the cooling process and completing a cycle.

[0047] That is, the phase change cooling sheet 33 changes phase (liquefies) and absorbs heat, completing the heat transfer between the heat dissipation device and the phase change cooling sheet 33 in the energy storage device 3, thereby cooling the heat dissipation device. The primary cooling system circulates continuously until all the phase change materials in the energy storage device 3 become liquid, and the cooling process ends.

[0048] 2) When the heating element system (heat dissipation device) is not working, start the secondary cooling system.

[0049] In the secondary cooling system, the refrigerant is compressed into a high-temperature and high-pressure gas in the compressor 4, and then transported to the condenser 5 through a pipeline. After passing through the surface of the condenser 5 and forced air cooling, most of the heat of the refrigerant is brought into the air, so that the high-pressure gas after flowing through the condenser 5 is condensed into a high-pressure liquid; the high-temperature and high-pressure liquid refrigerant flows through the thermal expansion valve 6 to reduce the pressure and temperature, and the low-temperature and low-pressure refrigerant flows back to the energy accumulator 3, which is equivalent to burying the evaporator in the secondary cooling system directly in the energy accumulator 3; the refrigerant evaporates in the energy accumulator 3, and the evaporation process will absorb a large amount of heat. At this time, the phase change cold storage plate 33 filled in the energy accumulator 3, that is, the phase change medium, will be continuously cooled and phase-changed, and the phase change medium will gradually change from liquid to solid until all the phase change media become solid, the cold charging process is completed, and the secondary cooling system is closed.

[0050] That is, the primary cooling system cools the heat dissipation device, and the secondary cooling system cools the energy storage device 3. The heat that needs to be absorbed (or released) by the phase change cooling sheet 33 in the energy storage device 3 for complete phase change is the cold capacity that the energy storage device 3 can store.

[0051] Among them, the power device 2 has two forms:

[0052] If the system does not have high requirements on vibration, the power device 2 can use a water pump to provide power for the liquid entering and exiting the microchannel heat sink, such as Figure 2 shown.

[0053] When the power device is a water pump, one end of the water pump is connected to the energy storage device 3, and the other end is connected to the microchannel heat sink 1, so that the coolant circulates in the primary cooling system.

[0054] The working process of the primary cooling system is: the low-temperature coolant in the energy accumulator 3 is input into the microchannel heat sink 1 for heat exchange through a water pump, and the high-temperature coolant after heat exchange is pumped back into the energy accumulator 3 to realize the circulation of the primary cooling system. That is, when the coolant in the primary cooling system circulates, the low-temperature coolant exchanges heat with the heat dissipation device when flowing through the microchannel heat sink 1, releases the cold stored in the energy accumulator 3 and cools the heat dissipation device at the same time.

[0055] 2) For systems that are very sensitive to vibration, the power unit can use two high-pressure tanks (high-pressure gas tanks or gas bottles) to provide power for the primary cooling system using the pressure difference between the two high-pressure tanks, such as Figure 6 and Figure 7 shown.

[0056] When a high-pressure tank is used to provide power, the high-pressure tank includes a first high-pressure tank 11 and a second high-pressure tank 12. One end of the first high-pressure tank 11 is connected to one end of the second high-pressure tank 12 through a fifth valve 13, and the fifth valve 13 is normally closed. Further, the other end of the first high-pressure tank 11 is divided into two branches: the first branch is connected to the energy storage device 3 through the first valve 7, and the second branch is connected to the microchannel heat sink 1 through the second valve 8. The other end of the second high-pressure tank 12 is also divided into two branches: the third branch is connected to the energy storage device 3 through the third valve 9, and the fourth branch is connected to the microchannel heat sink 1 through the fourth valve 10.

[0057] That is, the primary cooling system includes a first branch, a second branch, a third branch and a fourth branch; the first branch can connect the first high-pressure tank 11 and the energy storage device 3, the third branch can connect the second high-pressure tank 12 and the energy storage device, the second branch can connect the first high-pressure tank 11 and the microchannel heat sink 1, and the fourth branch can connect the second high-pressure tank 12 and the microchannel heat sink.

[0058] Among them, the first branch and the second branch are not connected at the same time, the third branch and the fourth branch are not connected at the same time, the first branch and the fourth branch are connected at the same time, and the second branch and the third branch are connected at the same time. That is to say, the coolant in the first high-pressure tank 11 can enter the energy accumulator 3 through the first branch, flow through the microchannel heat sink 1 to release the cooling, and then flow into the second high-pressure tank 12 through the fourth branch. The coolant in the second high-pressure tank 12 enters the energy accumulator 3 through the third branch, flows through the microchannel heat sink 1 to release the cooling, and then flows into the first high-pressure tank 12 through the second branch. Through the reciprocating flow of the coolant between the first high-pressure tank 11 and the second high-pressure tank 12, the cooling of the energy accumulator 3 and the cooling of the heat dissipation device can be achieved.

[0059] like Figure 6 and Figure 7 As shown, the working process when the power device is a high-pressure tank (high-pressure gas tank or gas cylinder) is:

[0060] like Figure 6 As shown, when the heat dissipation device is working, the coolant is initially located in the first high-pressure tank 11, the first valve 7 and the fourth valve 10 are opened, and the second valve 8 and the third valve 9 are closed; the pressure of the first high-pressure tank 11 is adjusted to be greater than the pressure of the second high-pressure tank 12, so that the coolant flows from the first high-pressure tank 11 through the first valve 7 into the energy accumulator 3, and after being cooled in the energy accumulator 3, enters the microchannel heat sink 1 to cool the heating element system (heat dissipation device), and the coolant after heat exchange enters the second high-pressure tank 12 through the fourth valve 10, completing a positive cycle, which is called a forward operation process.

[0061] like Figure 7As shown, the third valve 9 and the second valve 8 are opened, the fourth valve 10 and the first valve 7 are closed, and the pressure of the second high-pressure tank 12 is adjusted to be higher than that of the first high-pressure tank 11, so that the coolant flows from the second high-pressure tank 12 through the third valve 9 into the energy storage device 3, and after being cooled, enters the microchannel heat sink 1 to cool the heating element system. The coolant after heat exchange enters the first high-pressure tank 11 through the second valve 8, completing a reverse cycle. This process of the second high-pressure tank is called the reverse operation process.

[0062] The above two processes are continuously alternated to realize the cooling process of the energy accumulator 3. Both the forward operation process and the reverse operation process can cool the heat dissipation device. When the coolant is transferred between the first high-pressure tank 11 and the second high-pressure tank 12, it first flows through the energy accumulator 3 and then flows through the microchannel heat sink 1, gradually completing the heat exchange between the energy accumulator 3 and the heat dissipation device, that is, through the repeated transfer of the coolant between the first high-pressure tank 11 and the second high-pressure tank 12, the cooling process of the energy accumulator 3 and the cooling of the heat dissipation device are realized.

[0063] In a specific implementation of the present invention, the energy storage device 3 includes: an inner soft box 32 and an outer box 34 .

[0064] Furthermore, the cross-sectional shapes of the inner soft box 32 and the outer box 34 may be circular, rectangular or regular polygonal.

[0065] Optionally, the inner soft box 32 is made of silicone.

[0066] Optionally, the outer box body 34 is made of metal. Preferably, the outer box body 34 is a stainless steel plate or an aluminum plate embedded with a heat-insulating material.

[0067] Furthermore, the inner soft box body 32 has a folding portion 31, and the folding portion 31 is in the shape of a corrugated tube, such as Figure 4 The volume of the inner soft box 32 can be adjusted by adjusting the folding state and folding degree of the folding portion 31 , or in other words, the volume of the inner soft box 32 can be adjusted by adjusting the stretching degree of the folding portion 31 .

[0068] Specifically, the folding portion 31 is a pleated structure, such as Figure 4 shown.

[0069] Furthermore, the folding portion has a plurality of peaks (convex portions), and troughs (concave portions) are formed between adjacent peaks. When the length of the outer box body 34 is extended, in order to achieve rapid expansion of the folding portion 31, a spring is arranged between adjacent peaks. During the elongation of the outer box body 34, the folds of the folding portion 31 are rapidly expanded under the action of the spring force, thereby extending the inner soft box body 34, so that the inner soft box body 32 can follow the extension of the outer box body 34, thereby expanding the cooling capacity of the energy storage device 3.

[0070] Furthermore, if Figure 4 , Figure 5 As shown, the outer box body 34 includes: a first box body 341 and a second box body 342 ; the first box body 341 is sleeved inside the second box body 342 and can slide relative to the second box body 342 .

[0071] The cold storage capacity of the energy storage device 3 of the present invention is adjustable. By adjusting the length of the overlapping part of the first box body 341 and the second box body 342, the length of the outer box body 34 of the expandable phase change cooling device of the present invention can be adjusted, and then the folding part 31 of the soft box body 32 is driven to fold or unfold by adjusting the length of the outer box body 34, thereby realizing the adjustment of the volume of the expandable phase change cooling device, and then changing the cold storage capacity of the expandable phase change cooling device, i.e., the energy storage device 3.

[0072] Furthermore, in a specific embodiment of the present invention, the first box body 341 and the second box body 342 are connected and fixed via a connecting member 343 .

[0073] Optionally, when the first box body 341 and the second box body 342 are cylindrical in shape, external threads are provided on the outside of the first box body 341 and the second box body 342, and stepped threaded holes are provided on the inside of the connecting member 343, that is, first threaded holes and second threaded holes of different diameters, and the connecting member 343 is threadedly connected with the external threads of the first box body 341 and the second box body 342 through the threaded holes. Specifically, the diameter of the first threaded hole is equal to the outer diameter of the first box body 341, and the diameter of the second threaded hole is equal to the outer diameter of the second box body 342; that is, the first threaded hole is threadedly connected with the external thread of the first box body 341, and the second threaded hole is threadedly connected with the external thread of the second box body 342.

[0074] Optionally, when the first box body 341 and the second box body 342 have a rectangular or polygonal shape, the connector 343 is a sleeve structure that can be sleeved with the connection between the first box body 341 and the second box body 342 of the outer box body 34. Specifically, the connector 343 is a vertically symmetrical splicing structure, and the sleeve structure includes a first half and a second half, and the first half and the second half are respectively arranged on the outside of the outer box body 34, and the first half and the second half are tightened and fixed by screws, and the first box body 341 and the second box body 342 of the outer box body 34 are clamped and fixed inside the connector 343 of the sleeve structure.

[0075] After the cooling capacity of the expandable phase change cooling device of the present invention is adjusted, the first box body 341 and the second box body 342 are fixed by the connecting member 343 to fix the structure of the expandable phase change cooling device, i.e., the energy storage device 3, to avoid displacement or misalignment during use.

[0076] In another specific embodiment of the present invention, a track is provided below the outer box 34 , and the first box 341 and the second box 342 are both slidably mounted on the track, and the length and volume of the outer box 34 are adjusted by relative sliding of the first box 341 and the second box 342 .

[0077] Example 2

[0078] This embodiment provides a cooling method for a cooling system based on a scalable phase change cooling device, using the cooling system of Embodiment 1, including the following steps:

[0079] Step S1: adjusting the cold storage capacity of the energy storage device 3 according to the heat dissipation of the heat dissipation device;

[0080] Step S2: determining the cooling power and cooling time of the secondary cooling system according to the duty cycle and heat dissipation of the heat dissipation device;

[0081] Step S3: Refrigeration process: the secondary cooling system is in operation, and the phase change medium in the energy storage device 3 solidifies to store cold; cold release process: the primary cooling system is in operation, and the phase change medium in the energy storage device 3 releases cold, and the coolant in the primary cooling system exchanges heat with the heat dissipation device when flowing through the microchannel heat sink 1, thereby cooling the heat dissipation device.

[0082] In step S2, parameters such as the flow rate of the microchannel heat sink 1 need to be determined according to different specifications of heat dissipation equipment. The flow rate of the microchannel heat sink 1 is divided into several paths, and the amount of each path of flow is determined according to the heating condition of the heating system.

[0083] In step S3, the secondary cooling system and the heat dissipation device in the cooling system of the present invention may work at different times. Specifically, when the heat dissipation device is not working, the secondary cooling system is running, and the energy storage device 3 stores cold energy. When the heat dissipation device is working, the primary cooling system is running, and the energy storage device 3 releases cold energy to cool the heat dissipation device. In addition, the interval time of the cooling system working is determined by the duty cycle of the heating system working. When the heat dissipation device is working, the secondary cooling system is not working, which solves the vibration influence of the traditional refrigeration unit on the heating body system (heat dissipation device).

[0084] The cooling system based on the expandable phase change cooling device of the present invention has a primary cooling system that works when the heat dissipation device needs to dissipate heat, and a secondary cooling system that stores cold when the heat dissipation device does not work. The heating power and working time of different heating systems are different. The working time and power of the cooling system and the cold storage capacity of the energy storage device 3 are determined for different heating systems, so that different types of heat dissipation devices can be cooled.

[0085] Furthermore, in step S1, the cold storage capacity of the energy storage device 3 is adjusted in the following manner: by adjusting the length of the overlapping portion of the first box body 341 and the second box body 342, the length of the outer box body 34 of the expandable phase change cooling device of the present invention can be adjusted, and then the folding portion 31 of the soft box body 32 is driven to fold or unfold by adjusting the length of the outer box body 34, thereby adjusting the volume of the expandable phase change cooling device, and then changing the cold storage capacity of the expandable phase change cooling device, i.e., the energy storage device 3.

[0086] Furthermore, in step S3, the working process of the cooling system includes: a refrigeration process and a cold release process; wherein the working process of the primary cooling system is a cold release process, which is used to cool the heat dissipation device; and the working process of the secondary cooling system is a refrigeration process, which is used to realize the cold storage of the energy storage device 3.

[0087] Step S31: The working process (refrigeration process) of the secondary cooling system is:

[0088] The refrigerant evaporates in the accumulator 3, and the evaporated gaseous refrigerant is compressed into a high-temperature and high-pressure gas in the compressor 4;

[0089] The high-temperature and high-pressure gaseous refrigerant is transported to the condenser 5, and through the surface of the condenser 5 and forced air cooling, most of the heat of the refrigerant is taken to the air, so that the high-pressure gas after passing through the condenser 5 is condensed into a high-temperature and high-pressure liquid refrigerant;

[0090] The high-temperature and high-pressure liquid refrigerant flows through the thermal expansion valve 6 and then is depressurized and cooled, and the low-temperature and low-pressure refrigerant flows back to the energy storage device 3;

[0091] The refrigerant evaporates in the energy storage device 3, and the evaporation process absorbs a large amount of heat. At this time, the phase change cooling sheet 33 filled in the energy storage device 3, i.e., the phase change medium, is continuously cooled and undergoes phase change, and the phase change medium gradually changes from liquid to solid.

[0092] The secondary cooling system works in a cycle until all phase change media become solid, the cooling process is completed, and the secondary cooling system is closed.

[0093] Step S32: The working process of the primary cooling system (cooling release process) is:

[0094] The coolant (water or ethylene glycol aqueous solution, etc.) in the primary cooling system flows through the energy accumulator 3, the microchannel heat sink 1 and the power device 2 in sequence; the low-temperature coolant flowing out of the energy accumulator 3 flows into the microchannel heat sink 1, and the low-temperature coolant flows through the microchannel heat sink 1 to cool the heat dissipation device;

[0095] The low-temperature coolant in the microchannel heat sink 1 is heated up after heat exchange with the heat dissipation device; the heated high-temperature coolant flows back to the energy storage device 3 under the drive of the power device 2;

[0096] The high-temperature coolant flowing back to the energy accumulator 3 exchanges heat with the phase-change cooling sheet 33. After the heat exchange, the high-temperature coolant is cooled to a lower temperature in the energy accumulator 3. At the same time, the phase-change medium in the energy accumulator 3 absorbs the heat released by the coolant and undergoes a phase change, gradually changing from solid to liquid, thus realizing the cooling process and completing a cycle.

[0097] Furthermore, in step S32, the power device 2 has at least two forms:

[0098] 1) The power device 2 is a water pump: If the system does not have high requirements on vibration, the power device 2 can use a water pump to provide power for the liquid entering and exiting the microchannel heat sink, such as Figure 2 shown.

[0099] 2) The power unit is a high-pressure tank: If the system is very sensitive to vibration, the power unit can use two high-pressure tanks (high-pressure gas tanks or gas cylinders) to provide power for the primary cooling system using the pressure difference between the two high-pressure tanks, such as Figure 6 and Figure 7 shown.

[0100] Specifically,

[0101] When the power device is a water pump:

[0102] The low-temperature coolant in the energy accumulator 3 is input into the microchannel heat sink 1 for heat exchange through a water pump, and the high-temperature coolant after heat exchange is pumped back into the energy accumulator 3 to realize the circulation of the primary cooling system.

[0103] When the power unit 2 is a high-pressure tank:

[0104] like Figure 6 and Figure 7 As shown, when the power device 2 is a high-pressure tank (high-pressure gas tank or gas cylinder), the working process is as follows: the coolant in the first high-pressure tank 11 can enter the energy accumulator 3 through the first branch, flow through the microchannel heat sink 1 to release the cooling, and then flow into the second high-pressure tank 12 through the fourth branch; the coolant in the second high-pressure tank 12 enters the energy accumulator 3 through the third branch, flows through the microchannel heat sink 1 to release the cooling, and then flows into the first high-pressure tank 12 through the second branch; the reciprocating flow of the coolant between the first high-pressure tank 11 and the second high-pressure tank 12 can realize the cooling of the energy accumulator 3 and the cooling of the heat dissipation device.

[0105] Specifically, if Figure 6 As shown, when the heat dissipation device is working, the coolant is initially located in the first high-pressure tank 11, the first valve 7 and the fourth valve 10 are opened, and the third valve 9 and the second valve 8 are closed; that is, the first branch and the fourth branch are connected, and the second branch and the third branch are disconnected;

[0106] Furthermore, the pressure of the first high-pressure tank 11 is adjusted to be greater than that of the second high-pressure tank 12, so that the coolant flows from the first high-pressure tank 11 through the first branch (first valve 7) into the energy accumulator 3, and after being cooled in the energy accumulator 3, enters the microchannel heat sink 1 to cool the heating element system (heat dissipation device), and the coolant after heat exchange enters the second high-pressure tank 12 through the fourth branch (fourth valve 10), completing a positive cycle. This process is called the forward operation process.

[0107] like Figure 7 As shown, the third valve 9 and the second valve 8 are opened, and the fourth valve 10 and the first valve 7 are closed, that is, the second branch and the third branch are connected, and the first branch and the fourth branch are disconnected;

[0108] Furthermore, the pressure of the second high-pressure tank 12 is adjusted to be higher than that of the first high-pressure tank 11, so that the coolant flows from the second high-pressure tank 12 through the third branch (third valve 9) into the energy storage device 3, and after being cooled, enters the microchannel heat sink 1 to cool the heating element system. The coolant after heat exchange enters the first high-pressure tank 11 through the second branch (second valve 8), completing a reverse cycle. This process of the second high-pressure tank is called the reverse operation process.

[0109] The above two processes are continuously alternated to realize the cooling process of the energy accumulator 3. Both the forward operation process and the reverse operation process can cool the heat dissipation device. When the coolant is transferred between the first high-pressure tank 11 and the second high-pressure tank 12, it first flows through the energy accumulator 3 and then flows through the microchannel heat sink 1, gradually completing the heat exchange between the energy accumulator 3 and the heat dissipation device, that is, through the repeated transfer of the coolant between the first high-pressure tank 11 and the second high-pressure tank 12, the cooling process of the energy accumulator 3 and the cooling of the heat dissipation device are realized.

[0110] When the primary cooling system is driven by a high-pressure tank, the coolant in the primary cooling system has two sets of flow paths: 1) the coolant flows from the first high-pressure tank 11 to the energy accumulator 3 through the first branch, flows through the microchannel heat sink 1, and then flows to the second high-pressure tank through the fourth branch; 2) the coolant flows from the second high-pressure tank 12 to the energy accumulator 3 through the third branch, flows through the microchannel heat sink 1, and then flows back to the first high-pressure tank 11 through the second branch. When the primary cooling system of the present invention uses a high-pressure tank to transport the coolant, it uses two sets of flow paths and the reciprocating circulation of the coolant and the continuous heat dissipation of the heat dissipation device.

[0111] Compared with the prior art, the technical solution provided by this embodiment has at least one of the following beneficial effects:

[0112] 1. The present invention adopts a phase change energy storage device to store cold, and utilizes the phase change material to absorb a large amount of heat when the phase change occurs to cool the medium entering the heat dissipation device. The latent heat of phase change is large, so the refrigeration unit and the heat dissipation device can work at different times. The working time of the refrigeration unit is relatively short, such as the first-level cooling system works for 5 minutes, and the second-level cooling system works for 1 hour or more, thereby greatly reducing the volume and weight of the refrigeration unit.

[0113] 2. The phase change temperature difference of the phase change material is small, which ensures the temperature uniformity of the heat dissipation equipment; since the primary cooling system and the secondary cooling system can work at different times, the vibration effect of the refrigeration unit on the heat dissipation equipment is greatly reduced.

[0114] 3. The power device 2 of the present invention can be a water pump, or two high-pressure gas tanks can be used to drive the operation of the cooling medium by utilizing the pressure difference, thereby further reducing the impact of vibration on the heat dissipation device.

[0115] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A cooling system based on a scalable phase change cooling device, characterized in that: include: A primary cooling system and a secondary cooling system; the primary cooling system comprises: an energy storage device (3), a power device (2) and a microchannel heat sink (1); the secondary cooling system is capable of cooling and solidifying a phase change medium in the energy storage device (3), the energy storage device (3) being used to store cold energy; the energy storage device (3) is an expandable phase change cooling device; the power device (2) is capable of driving a coolant to circulate in the energy storage device (3) and the microchannel heat sink (1); the microchannel heat sink (1) is capable of performing heat exchange with a heat dissipation device; The energy storage device (3) comprises: an inner soft box (32), a phase change cold storage sheet (33) and an outer box (34); the inner soft box (32) is provided with a phase change cold storage sheet (33); the outer box (34) is sleeved on the outer side of the inner soft box (32); The inner soft box (32) has a folding portion (31), and the folding portion (31) can be folded or unfolded; the outer box (34) comprises: a first box (341) and a second box (342), the first box (341) is sleeved inside the second box (342), and the length of the overlapping portion between the first box (341) and the second box (342) is adjustable.

2. The cooling system based on the scalable phase change cooling device according to claim 1, characterized in that: The secondary cooling system comprises: an energy accumulator (3), a compressor (4), a condenser (5) and a thermal expansion valve (6) which are connected in sequence; the compressor (4) is capable of compressing the evaporated refrigerant gas in the energy accumulator (3) into high-temperature and high-pressure gas; the condenser (5) is capable of condensing the high-temperature gas into liquid; the thermal expansion valve (6) is capable of throttling to reduce the temperature of the liquid; when the secondary cooling system is in operation: the refrigerant circulates among the energy accumulator (3), the compressor (4), the condenser (5) and the thermal expansion valve (6).

3. The cooling system based on the scalable phase change cooling device according to claim 1, characterized in that: The coolant outlet of the energy storage device (3) is connected to the coolant inlet of the microchannel heat sink (1); one end of the power device (2) is connected to the energy storage device (3), and the other end is connected to the microchannel heat sink (1).

4. The cooling system based on the scalable phase change cooling device according to claim 3 is characterized in that: The power device (2) is a water pump; one end of the water pump is connected to the energy storage device (3), and the other end is connected to the microchannel heat sink (1).

5. The cooling system based on the scalable phase change cooling device according to claim 3, characterized in that: The power device (2) is a high-pressure tank.

6. The cooling system based on the scalable phase change cooling device according to claim 5, characterized in that: The high-pressure tank comprises: a first high-pressure tank (11) and a second high-pressure tank (12); the first high-pressure tank (11) is connected to the energy storage device (3) via a first branch; the first high-pressure tank (11) is connected to the microchannel heat sink (1) via a second branch; the second high-pressure tank (12) is connected to the energy storage device (3) via a third branch, and the second high-pressure tank (12) is connected to the microchannel heat sink (1) via a fourth branch.

7. The cooling system based on the scalable phase change cooling device according to claim 6, characterized in that: A first valve (7) is provided on the first branch, a second valve (8) is provided on the second branch, a third valve (9) is provided on the third branch, and a fourth valve (10) is provided on the fourth branch.

8. A cooling method, characterized in that: A cooling system based on a scalable phase change cooling device according to any one of claims 1 to 7 comprises the following steps: Step S1: adjusting the cold storage capacity of the energy storage device (3) according to the heat dissipation capacity of the heat dissipation device; Step S2: determining the cooling power and cooling time of the secondary cooling system according to the duty cycle and heat dissipation of the heat dissipation device; Step S3: Refrigeration process: the secondary cooling system is in operation, and the phase change medium in the energy storage device (3) solidifies to store cold energy; cold release process: the primary cooling system is in operation, and the phase change medium in the energy storage device (3) releases cold energy, and the coolant in the primary cooling system flows through the microchannel heat sink (1) to exchange heat with the heat dissipation device, thereby cooling the heat dissipation device.

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