Anti-overheating cold plate of parallel two-phase flow system and working method of anti-overheating cold plate

Abstract

The invention discloses an anti-overheating cold plate of a parallel two-phase flow system and a working method of the anti-overheating cold plate. The cold plate comprises a cold plate shell, a main runner cover plate, an auxiliary runner cover plate, a control valve and a double-runner structure; in a normal working mode, a liquid working medium enters from the fluid inlet, cools the electronic component and then flows out of the gas-liquid two-phase working medium from the outlet; the throttling section and the heat exchange section are included, and low-temperature cooling is achieved through throttling cooling in the emergency mode; a memory alloy spring and a spring are arranged in the control valve to trigger emergency cooling, and the auxiliary flow channel is automatically closed after the temperature is recovered; the control valve is close to a main runner outlet, so that the double-runner heat exchange section is in a countercurrent relation, and the heat exchange efficiency is improved. The problem of overheating caused by air blockage of a two-phase flow system is effectively solved, temperature self-adaption regulation and control are achieved, and safe operation of electronic equipment is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of thermal control technology for electronic devices, and in particular relates to an anti-overheating cold plate for a parallel two-phase flow system and its working method. Background Technology

[0002] The rapid development of electronic technology has led to a significant increase in the integration of electronic devices, making advanced heat dissipation technology one of the key technologies restricting the performance of electronic devices. Phase change cooling is an important technical means to solve the thermal control of electronic devices with high heat flux density. A typical two-phase cooling system for electronic devices includes a two-phase flow unit, connecting pipes, and multiple heat dissipation plates, which are usually connected in parallel. Two-phase flow cooling systems have the characteristics of high heat dissipation efficiency and good temperature uniformity along the flow path. However, due to the complex gas-liquid phase changes and flow heat transfer behavior within the heat dissipation plates, local hot spots can easily induce instability in the two-phase flow, and even airlock. Differences in heat load between the heat dissipation plates further exacerbate these flow instabilities.

[0003] Chinese patent application CN111629572A discloses a flow adaptive adjustment device for a liquid-cooled cold plate in electronic devices, including a liquid-cooled cold plate, a thermal expansion component, and a flow channel. The flow channel is formed within the liquid-cooled cold plate, with an inlet at the top of the channel on the upper surface of the cold plate. A throttling component is installed at the bottom of the inlet. The thermal expansion component is installed within the liquid-cooled cold plate, and its side is connected to the thermal expansion component via a second bypass branch pipe. The side of the flow channel is connected to the thermal expansion component via a first bypass branch pipe. A temperature sensing cavity is formed inside the liquid-cooled cold plate, and this cavity is connected to the thermal expansion component via a channel. This patent, by adding a thermal expansion component to a conventional cold plate structure, enables the flow channel cross-sectional area of ​​the liquid-cooled cold plate to adaptively change with the temperature of the electronic device, improving the stability and safety of the phase change cooling system. However, the thermal expansion mechanism of this patent is similar to traditional refrigeration systems, with a complex structure and large volume, which is not conducive to integration with the cold plate. Meanwhile, the method of controlling the two-phase flow rate of the heat dissipation plate by adjusting the valve core opening of the thermal expansion mechanism cannot completely suppress the overheating of the cold plate caused by the instability of the two-phase flow. Summary of the Invention

[0004] The purpose of this invention is to provide a compact cold plate with temperature adaptive regulation function suitable for parallel two-phase flow systems and its working method.

[0005] To achieve the purpose of this invention, on the one hand, this invention provides an overheat protection cold plate for a parallel two-phase flow system, including a cold plate shell, a main flow channel cover plate, a secondary flow channel cover plate, a control valve, a fluid inlet, a fluid outlet, a secondary flow channel fluid outlet, a main flow channel, and a secondary flow channel;

[0006] The cold plate shell is equipped with electronic components to be cooled, which are used to connect the core of the two-phase flow system to prevent overheating of the cold plate.

[0007] The main channel cover is disposed above the cold plate shell and is used as the mounting surface for the heat source;

[0008] The secondary flow channel cover is disposed below the cold plate shell to form a secondary flow channel;

[0009] The control valve is located between the main flow channel and the secondary flow channel, and is used to control the flow of fluid in the secondary flow channel.

[0010] The fluid inlet is located on the side of the cold plate shell for the inflow of liquid working fluid;

[0011] The fluid outlet is located on the same side of the cold plate shell as the fluid inlet, and is used for the outflow of gas-liquid two-phase working fluid;

[0012] The secondary flow channel fluid outlet is located next to the fluid inlet and is used for the outflow of gas-liquid two-phase working fluid in emergency working mode.

[0013] The main flow channel is a flow cavity formed after the cold plate shell and the main flow channel cover are connected, which is used for heat exchange between the working fluid and the cold plate under normal working mode.

[0014] The secondary flow channel is a flow cavity formed after the cold plate shell and the secondary flow channel cover are connected, and is used for heat exchange between the working fluid and the cold plate in emergency operation mode.

[0015] On the other hand, the present invention also provides a method for operating an anti-overheating cold plate based on the above-mentioned parallel two-phase flow system, comprising the following steps:

[0016] Step 1: When the cold plate is in normal working condition, the room temperature high pressure liquid working fluid provided by the two-phase flow system enters the main channel of the cold plate from the fluid inlet. After cooling the electronic components, it becomes a high temperature and high pressure gas-liquid two-phase working fluid that flows out from the fluid outlet. The cold plate is cooled in time and the temperature is stable.

[0017] Step 2: When the system experiences unstable two-phase flow heat transfer due to disturbances or a sudden increase in the heat of electronic components, local hot spots appear on the cold plate, the dryness of the two-phase flow working fluid increases, the flow resistance of the main channel increases, the flow rate decreases, further deteriorating the heat transfer, and even extreme situations such as air blockage causing the flow rate of the main channel to drop to zero occur, and the temperature of the cold plate rises rapidly.

[0018] Step 3: The shape memory alloy spring connected to the cold plate shell heats up. When it heats up to a certain temperature, its elasticity increases and the opening force increases. When the opening force is greater than the locking force provided by the spring, the valve core moves towards the valve body and conducts the main flow channel and the secondary flow channel of the cold plate through the valve core through hole. The cold plate enters the emergency working mode. The room temperature high pressure liquid working fluid enters the fluid inlet of the secondary flow channel of the cold plate. After being throttled in the throttling section of the secondary flow channel, it becomes a low temperature and low pressure working fluid and enters the heat exchange section of the secondary flow channel to exchange heat with the cold plate shell. The cold plate is cooled in an emergency and its temperature decreases.

[0019] Step 4: After the temperature of the cold plate shell decreases, the local hot spots are eliminated, the flow rate of the working fluid in the main channel gradually returns to normal, the temperature of the cold plate decreases, the temperature and elasticity of the memory metal spring decrease, the valve core moves towards the memory metal spring, closes the inlet of the secondary flow channel, and the cold plate re-enters the normal working mode.

[0020] Compared with the prior art, the significant advancement of this invention lies in the following: This invention provides emergency cooling of the cold plate in a parallel two-phase flow system when gas lock occurs by using the adaptive opening and closing of the control valve in the cold plate and the throttling and cooling effect of the secondary flow channel. This avoids the cold plate temperature from soaring due to phase change instability in the parallel two-phase system, suppresses the instability of the two-phase flow in the system, and protects electronic components from temperature shocks and overheating risks. The anti-overheating cold plate for the parallel two-phase flow system has high integration, can be scaled up, and can adjust design parameters according to system characteristics, making it highly universal.

[0021] To more clearly illustrate the functional characteristics and structural parameters of the present invention, further explanation is provided below in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0023] Figure 1 This is a cross-sectional view of the overheat protection cold plate of the parallel two-phase flow system of the present invention;

[0024] Figure 2 This is a diagram of the overheat protection cooling plate for the parallel two-phase flow system of this invention;

[0025] Figure 3 This is a schematic diagram of the main flow channel of the parallel two-phase flow system with anti-overheating cold plate according to the present invention;

[0026] Figure 4 This is a schematic diagram of the overheat protection cold plate auxiliary flow channel of the parallel two-phase flow system of the present invention;

[0027] Figure 5 This is a schematic diagram of the overheat protection cold plate control valve for the parallel two-phase flow system of the present invention.

[0028] The attached diagram is labeled as follows: 1. Cold plate shell; 2. Main flow channel cover plate; 3. Secondary flow channel cover plate; 4. Control valve; 5. Fluid inlet; 6. Fluid outlet; 7. Secondary flow channel fluid outlet; 8. Main flow channel; 9. Secondary flow channel; 401. Control valve body; 402. Valve core; 403. Shape memory alloy spring; 404. Spring; 405. Valve core through hole; 901. Secondary flow channel fluid inlet; 902. Secondary flow channel throttling section; 903. Secondary flow channel heat exchange section. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] The present invention provides an overheat protection cold plate for a parallel two-phase flow system, combined with Figure 1 It includes a cold plate shell 1, a main flow channel cover plate 2, a secondary flow channel cover plate 3, a control valve 4, a fluid inlet 5, a fluid outlet 6, a secondary flow channel fluid outlet 7, a main flow channel 8, and a secondary flow channel 9.

[0031] The cold plate housing 1 is provided with electronic components to be cooled, which are used to connect the two-phase flow system anti-overheating cold plate core in parallel.

[0032] The main channel cover plate 2 is disposed above the cold plate shell 1 and is used as the mounting surface for the heat source;

[0033] The secondary flow channel cover plate 3 is disposed below the cold plate shell 1 to form a secondary flow channel;

[0034] The control valve 4 is located between the main flow channel 8 and the secondary flow channel 9, and is used to control the flow of fluid in the secondary flow channel.

[0035] The fluid inlet 5 is located on the side of the cold plate shell 1 for the inflow of liquid working fluid;

[0036] The fluid outlet 6 is located on the same side of the cold plate shell 1 as the fluid inlet 5, and is used for the outflow of gas-liquid two-phase working fluid;

[0037] The secondary flow channel fluid outlet 7 is located next to the fluid inlet 5 and is used for the outflow of gas-liquid two-phase working fluid in emergency working mode.

[0038] The main flow channel 8 is a flow cavity formed after the cold plate shell 1 and the main flow channel cover plate 2 are connected, and is used for heat exchange between the working fluid and the cold plate under normal working mode.

[0039] The secondary flow channel 9 is a flow cavity formed after the cold plate shell 1 and the secondary flow channel cover plate 3 are connected, and is used for heat exchange between the working fluid and the cold plate in emergency working mode.

[0040] The control valve 4 includes a control valve body 401, a valve core 402, a shape memory alloy spring 403, a spring 404, and a valve core through hole 405.

[0041] One end of the control valve body 401 is connected to the cold plate housing 1, which is used to seal the control valve 4 and the cold plate housing 1.

[0042] The valve core 402 is located in the middle of the cold plate housing 1 and can slide within the cold plate housing 1;

[0043] One end of the valve core 402 is connected to the shape memory alloy spring 403, and the other end is connected to the spring 404;

[0044] The other end of the shape memory alloy spring 403 is connected to the cold plate housing 1, and is used to provide the opening force for the movement of the valve core 402.

[0045] The other end of the spring 404 is connected to the cold plate housing 1 and is used to provide the locking force for the movement of the valve core;

[0046] The valve core through hole 405 is formed on the valve core 402 and is a through hole that runs vertically through the valve core. It is used to connect the main flow channel 8 and the secondary flow channel 9 when the control valve 4 is in the open state.

[0047] The valve core 402 has vent holes connected on both sides, which balance the gas pressure on both sides when the valve core 402 moves.

[0048] The shape memory alloy spring 403 is located in the cold plate housing near the heat source of the main channel 8 to sense the temperature change of the cold plate housing in a timely manner. When the temperature of the cold plate housing 1 does not reach the set value, the locking force is high, and the control valve 4 is in the closed state after the force is balanced. When the temperature of the cold plate housing 1 rises, the opening force of the shape memory alloy spring 403 increases, pushing open the valve core.

[0049] The secondary flow channel 9 includes a secondary flow channel fluid inlet 901, a secondary flow channel throttling section 902, and a secondary flow channel heat exchange section 903;

[0050] The secondary flow channel fluid inlet 901 is connected to the control valve 4 and is used to open the control valve 4 to allow the working medium to flow in.

[0051] The throttling section 902 of the secondary flow channel is connected to the fluid inlet 901 of the secondary flow channel and is used to throttle and cool the incoming working fluid entering the fluid inlet 901 of the secondary flow channel.

[0052] The heat exchange section 903 of the secondary flow channel is connected to the throttling section 902 of the secondary flow channel, and is used to cool the cold plate shell 1 by the incoming working fluid entering through the throttling section 902 of the secondary flow channel.

[0053] The equivalent diameter of the secondary flow channel throttling section 902 is 0.6 mm to 2.0 mm, and the length is 0.4 m to 2 m. The size is determined by the physical properties and operating parameters of the two-phase flow working fluid.

[0054] The heat exchange area of ​​the secondary flow channel heat exchange section 902 is 30% to 80% of the heat exchange area of ​​the main flow channel 8.

[0055] The control valve 4 is located near the outlet of the main flow channel 8, and is used to make the main flow channel 8 and the heat exchange section of the secondary flow channel 9 flow in a counter-current relationship.

[0056] A method for operating an overheat protection cold plate in a parallel two-phase flow system, as described above, includes the following steps:

[0057] Step 1: When the cold plate is in normal working condition, the room temperature high pressure liquid working fluid provided by the two-phase flow system enters the main channel 8 of the cold plate from the fluid inlet 5. After cooling the electronic components, it becomes a high temperature and high pressure gas-liquid two-phase working fluid and flows out from the fluid outlet 6. The cold plate is cooled in time and the temperature is stable.

[0058] Step 2: When the system experiences unstable two-phase flow heat transfer due to disturbances or a sudden increase in the heat of electronic components, local hot spots appear on the cold plate, the dryness of the two-phase flow working fluid increases, the flow resistance of the main channel increases, the flow rate decreases, further deteriorating the heat transfer, and even extreme situations such as air blockage causing the flow rate of the main channel to drop to zero occur, and the temperature of the cold plate rises rapidly.

[0059] Step 3: The temperature of the shape memory alloy spring 403 connected to the cold plate shell 1 increases. When the temperature rises to a certain level, the elasticity increases and the opening force increases. When the opening force is greater than the locking force provided by the spring 404, the valve core 402 moves towards the valve body 401 and conducts the main flow channel 8 and the secondary flow channel 9 of the cold plate through the valve core through hole 405. The cold plate enters the emergency working mode. The room temperature high pressure liquid working fluid enters the fluid inlet 901 of the secondary flow channel of the cold plate. After being throttled into a low temperature and low pressure working fluid in the throttling section 902 of the secondary flow channel, it enters the heat exchange section 903 of the secondary flow channel to exchange heat with the cold plate shell. The cold plate is cooled in an emergency and the temperature decreases.

[0060] Step 4: After the temperature of the cold plate shell 1 drops, the local hot spots are eliminated, the flow rate of the working fluid in the main channel gradually returns to normal, the temperature of the cold plate decreases, the temperature and elasticity of the memory metal spring 403 decrease, the valve core 402 moves towards the memory metal spring 403, closes the inlet of the secondary flow channel, and the cold plate re-enters the normal working mode.

[0061] Example 1

[0062] like Figure 2 The fluid inlet 5, fluid outlet 6, and secondary flow channel fluid outlet 7 are connected to the cold plate housing 1; the control valve 4 is installed from the side into the cold plate housing 1, and the interface end face is sealed; the main flow channel cold plate 2 is the mounting surface of the heat source.

[0063] like Figure 3 The cold plate flow channel 8 is machined on the cold plate shell 1; the secondary flow channel fluid inlet 901 is located near the fluid inlet 5.

[0064] like Figure 4 The cold plate secondary flow channel 8 is machined on the cold plate shell 1; the cooling working fluid enters from the secondary flow channel fluid inlet 901, passes through the secondary flow channel throttling section 902 and enters the secondary flow channel heat exchange section, cools the cold plate shell 1 and then flows out from the secondary flow channel fluid outlet.

[0065] like Figure 5 The control valve 4 is integrally installed in the cold plate housing 1 and sealed by the control valve body 401. One end of the shape memory alloy spring 403 presses against the cold plate housing 1, and the other end is connected to the valve core 402. The spring 404 is in a compressed state. One end of the spring 404 presses against the control valve body 401, and the other end is connected to the valve core 402. The spring is in a compressed state. The valve core through hole 405 is machined on the valve core 402. Under normal working conditions, the valve core through hole 405 is not connected to the main flow channel 8 and the secondary flow channel 9 of the cold plate. Under emergency working conditions, the valve core through hole 405 moves with the valve core 402 toward the control valve body 401, thus connecting the main flow channel 8 and the secondary flow channel 9 of the cold plate.

[0066] Example 2

[0067] The main body of the cold plate shell 1, main flow channel cover 2, secondary flow channel cover 3, inlet, outlet, and control valve 4 is made of 5A05 aluminum alloy. All structural components are connected using diffusion welding. The cooling medium is R134a. The main flow channel 8 has a depth of 4mm, and the secondary flow channel 9 has a depth of 2mm. The throttling section of the secondary flow channel 9 has an equivalent diameter of 1.6mm and a length of 0.8m. The heat exchange area of ​​the main flow channel 8 is 0.1m². 2 The heat exchange area of ​​the secondary flow channel 9 is 0.06m². 2 .

[0068] Example 3

[0069] The low-pressure chamber consists of an expansion tank and a liquid storage tank. The two-phase working fluid becomes a liquid working fluid after thermal processes such as cooling or compression, and is then reinjected into the main circulation of the two-phase flow system according to the system strategy.

[0070] Example 4

[0071] The low-pressure chamber is exposed to the outside atmospheric environment. In this case, the refrigerant is used as a consumable in the emergency mode of the cold plate to deal with extreme situations.

[0072] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0073] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cold plate for preventing overheating in a parallel two-phase flow system, characterized in that, Includes cold plate shell (1), main flow channel cover plate (2), secondary flow channel cover plate (3), control valve (4), fluid inlet (5), fluid outlet (6), secondary flow channel fluid outlet (7), main flow channel (8), and secondary flow channel (9). The cold plate shell (1) is provided with electronic components to be cooled, which are used to connect the two-phase flow system anti-overheating cold plate core; The main channel cover plate (2) is disposed above the cold plate shell (1) and is used as the mounting surface for the heat source; The secondary flow channel cover plate (3) is disposed below the cold plate shell (1) to form a secondary flow channel; The control valve (4) is located between the main flow channel (8) and the secondary flow channel (9) and is used to control the flow of fluid in the secondary flow channel. The fluid inlet (5) is located on the side of the cold plate shell (1) for the inflow of liquid working fluid; The fluid outlet (6) is located on the same side of the cold plate shell (1) as the fluid inlet (5) for the outflow of gas-liquid two-phase working fluid; The secondary flow channel fluid outlet (7) is located on one side of the fluid inlet (5) and is used for the outflow of gas-liquid two-phase working fluid in emergency working mode; The main channel (8) is a flow cavity formed after the cold plate shell (1) and the main channel cover plate (2) are connected, and is used for heat exchange between the working fluid and the cold plate under normal working mode; The secondary flow channel (9) is a flow cavity formed after the cold plate shell (1) and the secondary flow channel cover plate (3) are connected, and is used for heat exchange between the working fluid and the cold plate in emergency working mode.

2. The anti-overheating cold plate for a parallel two-phase flow system according to claim (1), characterized in that, The control valve (4) includes a control valve body (401), a valve core (402), a memory alloy spring (403), a spring (404), and a valve core through hole (405). One end of the control valve body (401) is connected to the cold plate housing (1) to keep the control valve (4) and the cold plate housing (1) in a sealed state; The valve core (402) is located in the middle of the cold plate housing (1) and can slide in the cold plate housing (1); One end of the valve core (402) is connected to the memory alloy spring (403), and the other end is connected to the spring (404); The other end of the memory alloy spring (403) is connected to the cold plate housing (1) to provide the opening force for the movement of the valve core (402); The other end of the spring (404) is connected to the cold plate housing (1) to provide the locking force for the movement of the valve core; The valve core through hole (405) is formed on the valve core (402) and is a through hole that runs vertically through the valve core. It is used to connect the main flow channel (8) and the secondary flow channel (9) when the control valve (4) is in the open state.

3. The anti-overheating cold plate for a parallel two-phase flow system according to claim (2), characterized in that, The valve core (402) has vent holes on both sides, which balance the gas pressure on both sides when the valve core (402) moves.

4. The anti-overheating cold plate for a parallel two-phase flow system according to claim (2), characterized in that, The memory alloy spring (403) is located in the cold plate housing near the heat source of the main channel (8) to sense the temperature change of the cold plate housing in a timely manner. When the temperature of the cold plate housing (1) does not reach the set value, the locking force is high, and the control valve (4) after the force is balanced is in the closed state. When the temperature of the cold plate housing (1) rises, the opening force of the memory alloy spring (403) increases, and the valve core is opened.

5. The anti-overheating cold plate for a parallel two-phase flow system according to claim 1, characterized in that, The secondary flow channel 9 includes a secondary flow channel fluid inlet (901), a secondary flow channel throttling section (902), and a secondary flow channel heat exchange section (903). The secondary flow channel fluid inlet (901) is connected to the control valve (4) and is used to open the flow of working fluid in the control valve (4); The throttling section (902) of the secondary flow channel is connected to the fluid inlet (901) of the secondary flow channel and is used to throttle and cool the incoming working fluid entering the fluid inlet (901) of the secondary flow channel. The heat exchange section (903) of the secondary flow channel is connected to the throttling section (902) of the secondary flow channel, and is used to cool the cold plate shell (1) by the incoming working fluid entering through the throttling section (902).

6. The anti-overheating cold plate for a parallel two-phase flow system according to claim 5, characterized in that, The equivalent diameter of the secondary flow channel throttling section (902) is 0.6 mm to 2.0 mm, and the length is 0.4 m to 2 m.

7. The overheat protection cold plate for a parallel two-phase flow system according to claim 5, characterized in that, The heat exchange area of ​​the secondary flow channel heat exchange section (902) is 30% to 80% of the heat exchange area of ​​the main flow channel (8).

8. The anti-overheating cold plate for a parallel two-phase flow system according to claim 1, characterized in that, The control valve (4) is located near the outlet of the main flow channel (8) to make the heat exchange section of the main flow channel (8) and the secondary flow channel (9) flow in a counter-current relationship.

9. A method for operating an anti-overheating cold plate in a parallel two-phase flow system according to any one of claims 1-8, characterized in that, Includes the following steps: Step 1: When the cold plate is in normal working condition, the room temperature high pressure liquid working fluid provided by the two-phase flow system enters the main channel (8) of the cold plate from the fluid inlet (5). After cooling the electronic components, it becomes a high temperature and high pressure gas-liquid two-phase working fluid and flows out from the fluid outlet (6). The cold plate is cooled in time and the temperature is stable. Step 2: When the system experiences unstable two-phase flow heat transfer due to disturbances or a sudden increase in the heat of electronic components, local hot spots appear on the cold plate, the dryness of the two-phase flow working fluid increases, the flow resistance of the main channel increases, the flow rate decreases, further deteriorating the heat transfer, and even extreme situations such as air blockage causing the flow rate of the main channel to drop to zero occur, and the temperature of the cold plate rises rapidly. Step 3: The temperature of the memory alloy spring (403) connected to the cold plate shell (1) rises. When it rises to a certain temperature, its elasticity increases and the opening force increases. When the opening force is greater than the locking force provided by the spring (404), the valve core (402) moves towards the valve body (401) and conducts the main flow channel (8) and the secondary flow channel (9) of the cold plate through the valve core through hole (405). The cold plate enters the emergency working mode. The room temperature high pressure liquid working medium enters the fluid inlet (901) of the secondary flow channel of the cold plate. After being throttled into a low temperature and low pressure working medium in the throttling section (902) of the secondary flow channel, it enters the heat exchange section (903) of the secondary flow channel to exchange heat with the cold plate shell. The cold plate is cooled in an emergency and its temperature decreases. Step 4: After the temperature of the cold plate shell (1) drops, the local hot spots are eliminated, the flow rate of the working fluid in the main channel gradually returns to normal, the temperature of the cold plate decreases, the temperature and elasticity of the memory metal spring (403) decrease, the valve core (402) moves towards the memory metal spring (403) to close the inlet of the secondary channel, and the cold plate re-enters the normal working mode.

Images