Liquid cooling radiator and negative pressure pump box and negative pressure structure thereof

Abstract

A negative pressure structure includes a main sealed cavity, the main sealed cavity is connected to a negative pressure device through a main outlet above the liquid surface to form a main passage, so that the gas or liquid in the main passage is discharged from the main sealed cavity through the negative pressure device, including a secondary sealed cavity corresponding to each liquid pump, at least two secondary sealed cavities, each of which is provided with a sensor, each of which transmits data to a control device through a data line or wire to output a first signal according to whether the pressure or pressure of the gas or liquid in the secondary sealed cavity meets a first threshold, and the first threshold is less than the external atmospheric pressure, including a control device, which controls the negative pressure device to open or close accordingly through the output signal of each sensor, so that each of the secondary sealed cavities meets the first threshold. A negative pressure pump box includes a negative pressure structure, including a liquid pump, forming a detachable or non-detachable whole. A liquid-cooled radiator includes a negative pressure structure.

Description

Technical Field

[0001] The present invention relates to the field of liquid cooling technology for cooling electronic circuit equipment including computer hosts, power supplies, charging piles, etc., and specifically to a liquid cooling radiator and its negative pressure pump box and negative pressure structure. Background Art

[0002] With the development of science and technology, the power consumption of electrical equipment such as computers and charging piles has gradually increased, and their heat dissipation needs have become increasingly urgent. Currently, there are three major types of radiators on the market, but the effects are not good. They are: 1. Passive radiators, which only have heat sinks and insufficient heat dissipation capacity; 2. Air-cooled radiators, which add fans to the heat sinks to enhance the heat dissipation capacity but also have large wind noise; 3. Liquid-cooled radiators. Currently, the common liquid-cooled radiators on the market are positive-pressure radiators, that is, because the water pump pumps water to the liquid cooling head, and the cold liquid expands due to heat, the internal pressure of the key liquid section including the liquid cooling head is greater than the external atmospheric pressure. Once damaged, it will leak out. Since the liquid cooling head interface is currently inside the chassis, once leaked, it is easy to cause serious electrical damage.

[0003] At present, liquid-cooled radiators with negative pressure technology have also appeared, but they can only support liquid-cooled radiators with a single liquid pump. The internal liquid circuit pressure of multi-liquid pump liquid-cooled radiators is complex and changeable, with irregular ups and downs, and it is not possible to provide negative pressure support for liquid-cooled radiators with multiple liquid pumps. However, liquid-cooled radiators with a single liquid pump often have insufficient performance such as head and flow rate. Liquid-cooled radiators with multiple liquid pumps have many advantages over them, such as higher cold liquid circulation capacity, such as redundant design of the pumping capacity of the liquid pump to improve reliability, such as the ability of multiple liquid pumps to reduce power operation at the same flow rate to reduce noise and improve reliability, and multiple low-head liquid pumps can be connected in series to achieve the same circulation capacity as a single high-head liquid pump and the maximum pressure of the liquid circuit is lower than that of the single liquid pump solution. Therefore, there is an urgent need to provide negative pressure leak-proof support for liquid-cooled radiators with multiple liquid pumps. Summary of the invention

[0004] In view of the above shortcomings, a liquid-cooled radiator and its negative pressure pump box and negative pressure structure are proposed to solve the problems of liquid leakage and derived electrical failures caused by liquid cooling of electronic circuit equipment and the current problem of being unable to provide negative pressure support for multi-liquid pump liquid-cooled radiators.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] Disclosed is a negative pressure structure, comprising a main sealed cavity, wherein the main sealed cavity is connected to a negative pressure device through a main outlet above a liquid surface to form a main passage, so that gas or liquid in the main passage is discharged from the main sealed cavity through the negative pressure device, wherein the negative pressure device comprises a manual, electric or pneumatic negative pressure device, wherein the manual negative pressure device comprises a syringe or an air cylinder, wherein the electric or pneumatic negative pressure device comprises a diaphragm pump, a gear pump, a peristaltic pump or a self-priming pump,

[0007] It includes a secondary sealing cavity corresponding to each liquid pump, there are at least two secondary sealing cavities, each of the secondary sealing cavities is provided with a sensor, or each of the secondary sealing cavities is provided with a sensor detection port directly or through a pipeline and sealed one by one with sensors concentrated in one place, each of the sensors transmits data to a control device through a data line or wire according to whether the pressure or pressure of the gas or liquid in the secondary sealing cavity meets a first threshold value and outputs a first signal, the first threshold value is less than the external atmospheric pressure, and the sensor includes a capacitor or a resistor or a voltage or a current sensor or a pressure or a pressure sensor or a position sensor,

[0008] The main sealed cavity or the secondary sealed cavity is a container made of materials to prevent leakage of cooling liquid, including silicone, plastic or metal, which can store solution without leakage. The main sealed cavity is connected to the liquid circuit of the liquid cooling radiator through its third outlet below the liquid level or is connected in series to any position in the liquid cooling radiator through its second inlet and the third outlet below the liquid level. The main sealed cavity can be a liquid storage tank in the liquid cooling radiator. Each of the secondary sealed cavities is connected in parallel to the liquid outlet side of each liquid pump in the liquid cooling radiator through its fifth outlet or in series through its fourth inlet and its fifth outlet.

[0009] It includes a control device, which includes a manual type or an automatic type. When the negative pressure device is driven by electric energy, the control device is electrically connected to the negative pressure device. When the negative pressure device is driven by high-pressure gas, the control device is connected to the pneumatic pipeline connected to the negative pressure device. The manual type includes a switch module, and the switch module includes a touch switch or a self-locking switch or a delay switch or a self-reset switch or a ball valve or a pipe clamp. The switch is connected in series in the circuit loop of the negative pressure device or is arranged on the pneumatic pipeline to control the working state of the negative pressure device. The automatic type includes a controller electrically connected to each of the sensors. The controller includes a solenoid valve or a relay or a touch switch or a delay switch or a diode or a triode or a pneumatic switch or an integrated control circuit. The controller is connected in series or in parallel in the circuit loop of the negative pressure device or on the pneumatic pipeline, and controls the negative pressure device to be opened or closed accordingly through the output signal of each sensor, so that each of the secondary sealing cavities meets the first threshold value.

[0010] In some specific embodiments of the present invention, the control device includes a data input and output interface, and the data includes real-time parameters or design parameters or control signals of each liquid pump or the temperature or flow rate or flow velocity or pressure of the liquid circuit of the liquid cooling radiator.

[0011] In some specific embodiments of the present invention, the first threshold value includes a start threshold value and a stop threshold value, and the negative pressure device starts after the pressure in the secondary sealing cavity does not meet the start threshold value, and stops after the pressure in the secondary sealing cavity meets the start threshold value and then meets the stop threshold value.

[0012] In some specific embodiments of the present invention, the main passage is provided with a one-way valve so that the gas or liquid in the main sealing cavity can and can only be discharged from the main sealing cavity in one direction under the action of the negative pressure device, or the main passage is provided with a pipeline switch, and the pipeline switch is connected to the negative pressure device simultaneously or successively, and the pipeline switch includes a ball valve, a solenoid valve or a pipe clamp.

[0013] In some specific embodiments of the present invention, the negative pressure device can overcome the negative pressure generated by the liquid inlet of the liquid pump when the liquid pump is running in the liquid cooling system and discharge the gas or liquid in the main sealing cavity out of the main sealing cavity.

[0014] In some specific embodiments of the present invention, when the pressure in any of the secondary sealed cavities still does not meet the first threshold value after the negative pressure device is started and runs to the maximum negative pressure, the control device controls the liquid pump whose outlet is connected to this secondary sealed cavity to slow down or shut down until the pressure in all the secondary sealed cavities meets the first threshold value.

[0015] In some specific embodiments of the present invention, when the pressure in any of the secondary sealed cavities still does not meet the first threshold after the negative pressure device is started and runs to the maximum negative pressure, the control device controls the liquid pump whose outlet is connected to this secondary sealed cavity to slow down or shut down until the pressure in all the secondary sealed cavities meets the first threshold. The control device controls at least one other liquid pump to increase its power according to the data obtained from the data input interface or the output signal of the sensor.

[0016] In some specific embodiments of the present invention, an alarm is included. When the pressure in any of the secondary sealing chambers does not meet the second threshold value, or the cumulative activation time of the negative pressure device reaches a preset value within the preset time, or the number of activations reaches a preset value, or any of the sensors measures that the negative pressure decreases rapidly, an alarm is initiated. The alarm includes a sound, light, or vibration alarm or sends an alarm message, and the second threshold value is between the first threshold value and the external atmospheric pressure and does not overlap with the first threshold value.

[0017] In some specific embodiments of the present invention, an alarm is included. When the pressure in any of the secondary sealing chambers does not meet the second threshold value, or the cumulative start-up time of the negative pressure device reaches a preset value within a preset time, or the number of starts reaches a preset value, or any of the sensors measures that the negative pressure decreases rapidly, an alarm is initiated. The control device controls at least one of the liquid pumps to reduce power or stop running. The alarm includes an audible, optical, or vibration alarm or sends an alarm message. The second threshold value is between the first threshold value and the external atmospheric pressure and does not overlap with the first threshold value.

[0018] In some specific embodiments of the present invention, when the pressure in any of the secondary sealing chambers does not meet the second threshold value, or the cumulative start-up time of the negative pressure device reaches a preset value within a preset time, or the number of starts reaches a preset value, or when the negative pressure measured by any of the sensors rapidly decreases, the control device controls the liquid pump along the cold liquid circulation direction from the liquid outlet of the main sealing chamber to the secondary sealing chamber section that does not meet the second threshold value to reduce power or stop running.

[0019] In some specific embodiments of the present invention, a power-off device is included, which includes a relay or a MOS switch tube or a total control circuit. The power-off device is installed on the main power circuit of the equipment using the liquid-cooled radiator using this negative pressure structure, and disconnects the power supply of the equipment using the liquid-cooled radiator using this negative pressure structure when the pressure in any of the secondary sealing chambers does not meet the second threshold or when the cumulative startup time of the negative pressure device reaches a preset value within a preset time or when the number of startups reaches a preset value. The second threshold is between the first threshold and the external atmospheric pressure and does not overlap with the first threshold.

[0020] In some specific embodiments of the present invention, a safety device is included. The safety device has a cavity formed of a leak-proof material, and has an air hole above the liquid level in the cavity to connect to the outside atmosphere. The safety device is arranged at the end of the main passage to store the liquid discharged by the negative pressure device to prevent the liquid from causing unexpected situations.

[0021] In some specific embodiments of the present invention, the energy required for the negative pressure structure comes from outside the device using the liquid cooling radiator of the negative pressure structure.

[0022] In some specific embodiments of the present invention, the negative pressure structure is provided with a self-contained power supply including a non-rechargeable battery or a rechargeable battery or a supercapacitor, and can continue to work through the self-contained power supply after the external power supply fails.

[0023] In some specific embodiments of the present invention, the main sealed cavity is connected to the liquid circuit of the liquid-cooled radiator through a third outlet located below the liquid level, or is connected in series to any liquid pump inlet in the liquid-cooled radiator through its second inlet and a third outlet located below the liquid level.

[0024] In some specific embodiments of the present invention, a fluid infusion port is included, and the fluid infusion port is arranged above the liquid level of the main sealing cavity.

[0025] Disclosed is a negative pressure pump box, comprising any one of the negative pressure structures described above, including a liquid pump, wherein the liquid inlet of the liquid pump is connected to the main sealing cavity, and the liquid outlet is connected to at least one of the secondary sealing cavities to form a detachable or non-detachable whole.

[0026] Disclosed is a liquid-cooled radiator, comprising any one of the negative pressure structures described above, wherein a liquid path of the liquid-cooled radiator is sealed and isolated from the environment.

[0027] The beneficial effects of the present invention are:

[0028] By setting a negative pressure structure in the main sealing cavity, the liquid cooling radiator forms a negative pressure to prevent it from being damaged and then leaking to cause damage to the electrical appliances. By setting a secondary sealing cavity and a sensor on the side of each liquid pump outlet, the multi-liquid pump liquid cooling radiator can obtain negative pressure support. At the same time, there is no need to consider the liquid pump parameters, and there is no need to set different thresholds for different liquid pumps. It is only necessary to uniformly set the threshold of each sensor to be less than the external atmospheric pressure to keep the entire liquid cooling system in a negative pressure state through the negative pressure device, thereby obtaining great versatility. By setting a control device to automatically control the start or stop of the negative pressure device according to the internal pressure of the liquid cooling radiator. By setting a delay device or a start threshold and a stop threshold, the number of starts of the negative pressure device is reduced, the noise is reduced, and the reliability is improved. By setting the liquid replenishment port at the water inlet of the water pump, the cold liquid can be sucked into the liquid cooling radiator through the negative pressure device. When the liquid pump is a centrifugal pump, the cold liquid can flow into the centrifugal pump by itself, so that the centrifugal pump can operate smoothly to form a cycle. By setting an alarm or a power-off device or a self-contained power supply or a fuse, the safety is further improved. The power of the liquid pump is dynamically adjusted by the control device, so that even if the total head of the liquid pump exceeds the maximum negative pressure capacity of the negative pressure device, the entire liquid circuit of the liquid cooling radiator can maintain negative pressure, and at the same time, different flow resistances of different parts of the liquid circuit are adapted, so as to obtain a more efficient circulation of the entire liquid circuit under negative pressure. When the pressure in any of the secondary sealing cavities does not meet the second threshold value or the cumulative startup time of the negative pressure device reaches a preset value within a preset time or the number of startups reaches a preset value or any of the sensors measures that the negative pressure rapidly decreases, the control part of the liquid pump reduces the power or stops running, reduces the burden on the negative pressure device, and better prevents water leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a preferred structural diagram of a negative pressure liquid-cooled radiator.

[0030] Description of main reference numerals:

[0031] 11-Liquid pump A, 12-Liquid pump B, 2-Liquid cooling head, 31-Radiator A, 32-Radiator B, 41-Main sealing chamber, 411-Main outlet, 412-Second inlet, 413-Third outlet, 414-Liquid replenishing port, 42-Auxiliary sealing chamber A, 421-Fourth inlet, 422-Fifth outlet, 43-Auxiliary sealing chamber B, 44-Negative pressure device, 5-Sealed pipeline. DETAILED DESCRIPTION

[0032] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the embodiments or prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings or embodiments can be obtained based on these drawings or embodiments without creative efforts. All other embodiments obtained by ordinary technicians in this field without creative efforts belong to the scope of protection of the present invention.

[0033] At least one specific embodiment of the present invention is Figure 1 As shown, the liquid storage tank also serves as the main sealed chamber 41, liquid pump A 11, liquid cooling head 2, radiator A 31, liquid pump B 12. Radiator B 32 is connected in series in sequence through the sealed pipeline 5 to form a sealed circulation liquid circuit of the multi-liquid pump liquid cooling radiator. The liquid circuit circulation direction is shown by the arrow in the figure. The negative pressure device 44 is connected to the gas or liquid in the main sealed chamber 41 through the main outlet 411 above the liquid level to form a main passage. The main sealed chamber 41 is connected to the liquid inlet of the liquid pump A 11 through the third outlet 413 below the liquid level. The auxiliary sealed chamber A 42 and the auxiliary sealed chamber B 43 are respectively arranged at the liquid outlets of the liquid pump A 11 and the liquid pump B 12 through the fourth inlet 421 and the fifth outlet 422. The A-sealed cavity 42 and the B-sealed cavity 43 are both provided with sensors to detect whether the internal pressure is lower than the ambient pressure and reaches a threshold value. The sensors are electrically connected to the control device to transmit signals so that the control device controls the negative pressure device 44. When any sensor detects that the pressure does not meet the threshold value, it sends a signal to the controller. The controller controls the negative pressure device to start until the pressure in all the secondary sealed cavities is lower than the ambient pressure and meets the threshold value, then controls the negative pressure device 44 to stop.

[0034] Preferably, the main passage is provided with a solenoid valve, which is turned on when the negative pressure device 44 is started and closed when the negative pressure device stops, so that the liquid circuit is isolated from the outside and maintains negative pressure for a longer time after the negative pressure device stops.

[0035] Preferably, the negative pressure device 44 can be a diaphragm pump or a peristaltic pump, the sensor can be a differential pressure switch or a pressure transmitter, and the control device can be a time delay relay or an integrated control circuit. When the sensor has only one threshold value, the time delay device can be used to reduce the start and stop times of the negative pressure device. When the sensor has multiple threshold values, the negative pressure can be controlled within a preset range by setting start or stop commands for the multiple threshold values ​​respectively, and the alarm can be used to sound an alarm under appropriate circumstances, and the power-off device can be used to cut off the power of the equipment using this liquid-cooled radiator.

[0036] Preferably, the fluid replenishment port 414 is arranged in the main sealing cavity 41, and its altitude is higher than the first passage at the inner end of the main sealing cavity 41. When the cooling liquid in the main sealing cavity 41 is insufficient, that is, the liquid level height is lower than the first passage at the inner end of the main sealing cavity 41 and needs to be replenished, the fluid replenishment port 414 located on the liquid surface can be safely opened while the liquid-cooled radiator is operating normally to avoid leakage of cooling liquid. At the same time, because the cooling liquid inside the liquid-cooled radiator maintains a negative pressure state, its hydraulic pressure rises after the fluid replenishment port 414 is opened, causing the negative pressure device 44 to start. After the fluid replenishment tube is sealed and the prepared replenishing liquid is immersed at its end, the replenishing liquid can be automatically sucked into the main sealing cavity 41 through the negative pressure, thereby realizing automatic filling of cooling liquid.

[0037] Preferably, the negative pressure device 44, the main sealing cavity 41, the nail liquid pump 11, and the nail auxiliary sealing cavity 42 can be integrated into a detachable or inseparable whole to achieve higher aesthetics and simplicity.

[0038] When the negative pressure device 44 runs to the maximum negative pressure and the pressure in the auxiliary sealed chamber A 42 or the auxiliary sealed chamber B still meets the first threshold, the total operating head of the liquid pump A 11 and the liquid pump B 12 exceeds the negative pressure support upper limit, and the control device controls the liquid pump of the auxiliary sealed chamber whose outlet is connected to the first threshold to reduce power or stop running, so that the overall liquid circuit maintains negative pressure.

[0039] When there is no leakage in the liquid circuit, that is, any of the secondary sealing cavities meets the second threshold, and one secondary sealing cavity meets the first threshold while other secondary sealing cavities do not meet the first threshold, it means that the operating power configuration of the liquid pump group does not match the actual flow resistance of each part of the liquid circuit. At this time, the control device controls the liquid pump of the inlet connection of the secondary sealing cavity that does not meet the first threshold to appropriately increase the power operation, so as to maintain negative pressure in the entire liquid circuit while improving the liquid circuit circulation efficiency.

[0040] When leakage occurs in the liquid circuit, that is, any of the secondary sealing cavities does not meet the second threshold, the control device controls the liquid pump along the cold liquid circulation direction from the liquid outlet of the main sealing cavity to the secondary sealing cavity section that does not meet the second threshold to reduce power or stop operation, so as to reduce the negative pressure burden of the negative pressure device and improve safety.

[0041] After adopting the above scheme, the cold liquid inside the liquid-cooled radiator is kept at negative pressure to prevent the cold liquid in the liquid cooling system from leaking outward. By setting a secondary sealing cavity at the water outlet of each liquid pump and detecting its pressure through a sensor, there is no need to consider the water pump parameters to set different thresholds for different water pumps. It is only necessary to uniformly set the sensor threshold to be less than the external atmospheric pressure to keep the entire multi-liquid pump liquid cooling system in a negative pressure state through the negative pressure device, thereby achieving great versatility. A control device is set to automatically control the start or stop of the negative pressure device according to the internal pressure of the liquid-cooled radiator. The control device has a delay function to reduce the number of times the negative pressure device is started, reduce noise and improve reliability. By setting the liquid replenishment port at the water inlet of the water pump, the cold liquid can be sucked into the liquid-cooled radiator through the negative pressure device and flow into the centrifugal pump, so that the centrifugal pump can operate smoothly to form a cold liquid circulation, and the safety is further improved by setting an alarm or a power-off device or a self-contained power supply. By dynamically adjusting the liquid pump power through the control device, even if the total lift of the liquid pump exceeds the maximum negative pressure capacity of the negative pressure device, the entire liquid circuit of the liquid-cooled radiator can still maintain negative pressure. At the same time, different flow resistances of different parts of the liquid circuit are adapted, thereby obtaining a more efficient circulation of the entire liquid circuit under negative pressure.

[0042] The above description is only preferably used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person skilled in the art can still make other modifications to the technical solution of the present invention or replace some of the technical features therein with equivalents, or split or merge some of them. Any modifications, equivalent replacements, improvements, etc. made without departing from the spirit and scope of the technical solution of the present invention are all covered by the protection scope of the present invention.

Claims

1. A negative pressure structure, characterized in that: It includes a main sealing cavity, the main sealing cavity is connected to the negative pressure device through a main outlet above the liquid level to form a main passage, so that the gas or liquid in the main passage is discharged from the main sealing cavity through the negative pressure device, the negative pressure device includes a manual, electric or pneumatic negative pressure device, the manual negative pressure device includes a syringe or an air cylinder, the electric or pneumatic negative pressure device includes a diaphragm pump, a gear pump, a peristaltic pump or a self-priming pump, It includes a secondary sealing cavity corresponding to each liquid pump, there are at least two secondary sealing cavities, each of the secondary sealing cavities is provided with a sensor, or each of the secondary sealing cavities is provided with a sensor detection port directly or through a pipeline and sealed one by one with a sensor concentrated in one place, each of the sensors transmits data to a control device through a data line or wire according to whether the pressure or pressure of the gas or liquid in the secondary sealing cavity meets a first threshold value and outputs a first signal, the first threshold value is less than the external atmospheric pressure, the sensor includes a capacitor or a resistor or a voltage or a current sensor or a pressure or a pressure sensor or a position sensor, The main sealed cavity or the secondary sealed cavity is a container made of materials to prevent leakage of cooling liquid, including silicone, plastic or metal, which can store solution without leakage. The main sealed cavity is connected to the liquid circuit of the liquid cooling radiator through its third outlet below the liquid level or connected in series to any position in the liquid cooling radiator through its second inlet and the third outlet below the liquid level. The main sealed cavity is a liquid storage tank in the liquid cooling radiator. Each of the secondary sealed cavities is connected in parallel to the liquid outlet side of each liquid pump in the liquid cooling radiator through its fifth outlet or connected in series to the liquid outlet side of each liquid pump in the liquid cooling radiator through its fourth inlet and its fifth outlet. It includes a control device, which includes a manual type or an automatic type. When the negative pressure device is driven by electric energy, the control device is electrically connected to the negative pressure device. When the negative pressure device is driven by high-pressure gas, the control device is connected to the pneumatic pipeline connected to the negative pressure device. The manual type includes a switch module, and the switch module includes a touch switch or a self-locking switch or a delay switch or a self-reset switch or a ball valve or a pipe clamp. The switch is connected in series in the circuit loop of the negative pressure device or is arranged on the pneumatic pipeline to control the working state of the negative pressure device. The automatic type includes a controller electrically connected to each of the sensors. The controller includes a solenoid valve or a relay or a touch switch or a delay switch or a diode or a triode or a pneumatic switch or an integrated control circuit. The controller is connected in series or in parallel in the circuit loop of the negative pressure device or on the pneumatic pipeline, and controls the negative pressure device to be opened or closed accordingly through the output signal of each sensor, so that each of the secondary sealing cavities meets the first threshold.

2. A negative pressure structure according to claim 1, characterized in that: The main passage is provided with a one-way valve so that the gas or liquid in the main sealing cavity can and can only be discharged from the main sealing cavity in one direction under the action of the negative pressure device, or the main passage is provided with a pipeline switch, the pipeline switch and the negative pressure device are connected simultaneously or successively, and the pipeline switch includes a ball valve or a solenoid valve or a pipe clamp, and / or the control device includes a data input and output interface, wherein the data includes real-time parameters or design parameters or control signals of each liquid pump or the temperature or flow rate or flow velocity or pressure of the liquid circuit of the liquid cooling radiator, And / or a cold row or cold head is provided between the liquid pumps, And / or the first threshold includes a start threshold and a stop threshold, and the negative pressure device starts after the pressure in the secondary sealing cavity does not meet the start threshold, and stops after the pressure in the secondary sealing cavity meets the start threshold and then meets the stop threshold.

3. A negative pressure structure according to claim 1, characterized in that: The negative pressure device can overcome the negative pressure generated by the liquid inlet of the liquid pump in the liquid cooling system when the liquid pump is running, and discharge the gas or liquid in the main sealing cavity out of the main sealing cavity. and / or the control device controls the liquid pump whose outlet is connected to the secondary sealed cavity to slow down or shut down when the pressure in any of the secondary sealed cavities still does not meet the first threshold after the negative pressure device is started and runs to the maximum negative pressure, until the pressure in all the secondary sealed cavities meets the first threshold, And / or when the pressure in any of the secondary sealed cavities still does not meet the first threshold value after the negative pressure device is started and runs to the maximum negative pressure, the control device controls the liquid pump whose outlet is connected to this secondary sealed cavity to slow down or shut down, until the pressure in all the secondary sealed cavities meets the first threshold value, and the control device controls at least one other liquid pump to increase its power according to the data obtained from the data input interface or the output signal of the sensor.

4. A negative pressure structure according to claim 1, characterized in that: An alarm is included, which starts to alarm when the pressure in any of the secondary sealing cavities does not meet the second threshold value, or when the cumulative activation time of the negative pressure device reaches a preset value within a preset time, or when the number of activations reaches a preset value, or when any of the sensors measures that the negative pressure decreases rapidly. The alarm includes an audible, optical, or vibration alarm or sends an alarm message, and the second threshold value is between the first threshold value and the external atmospheric pressure and does not overlap with the first threshold value. and / or includes an alarm, when the pressure in any of the secondary sealing chambers does not meet the second threshold value, or the cumulative activation time of the negative pressure device reaches a preset value within a preset time, or the number of activations reaches a preset value, or any of the sensors measures that the negative pressure rapidly decreases, an alarm is triggered, the control device controls at least one of the liquid pumps to reduce power or stop running, the alarm includes an audible, optical or vibration alarm or sends an alarm message, the second threshold value is between the first threshold value and the external atmospheric pressure and does not overlap with the first threshold value, And / or when the pressure in any of the secondary sealing chambers does not meet the second threshold value, or the cumulative start-up time of the negative pressure device reaches a preset value within the preset time, or the number of starts reaches a preset value, or when the negative pressure measured by any of the sensors rapidly decreases, the control device controls the liquid pump along the cold liquid circulation direction from the liquid outlet of the main sealing chamber to the secondary sealing chamber section that does not meet the second threshold value to reduce power or stop running.

5. A negative pressure structure according to claim 1, characterized in that: It includes a power-off device, which includes a relay or a MOS switch tube or a total control circuit. The power-off device is installed on the main power circuit of the equipment using the liquid-cooled radiator using this negative pressure structure, and disconnects the power supply of the equipment using the liquid-cooled radiator using this negative pressure structure when the pressure in any of the secondary sealing chambers does not meet the second threshold value or when the cumulative startup time of the negative pressure device reaches a preset value within a preset time or when the number of startups reaches a preset value. The second threshold value is between the first threshold value and the external atmospheric pressure and does not overlap with the first threshold value.

6. A negative pressure structure according to claim 1, characterized in that: It includes a safety device, which has a cavity formed by leak-proof material, and has an air hole above the liquid level in the cavity to connect to the outside atmosphere. It is arranged at the end of the main passage to store the liquid discharged by the negative pressure device to avoid accidents caused by the liquid.

7. A negative pressure structure according to claim 1, characterized in that: The energy required for the negative pressure structure comes from outside the equipment using the liquid cooling radiator of the negative pressure structure. And / or the negative pressure structure is provided with a self-contained power supply including a non-rechargeable battery or a rechargeable battery or a supercapacitor, and continues to work through the self-contained power supply after the external power supply fails.

8. A negative pressure structure according to claim 1, characterized in that: The main sealed cavity is connected to the liquid circuit of the liquid cooling radiator through the third outlet located below the liquid level, or is connected in series to any liquid pump inlet of the liquid cooling radiator through the second inlet and the third outlet located below the liquid level. And / or includes a liquid infusion port, and the liquid infusion port is arranged above the liquid level of the main sealing cavity.

9. A negative pressure pump box, characterized in that: A negative pressure structure according to any one of claims 1 to 8, comprising a liquid pump, wherein the liquid inlet of the liquid pump is connected to the main sealing cavity, and the liquid outlet is connected to at least one of the secondary sealing cavities to form a detachable or non-detachable whole.

10. A liquid cooling radiator, characterized in that: It comprises a negative pressure structure as described in any one of claims 1-8, wherein the liquid circuit of the liquid cooling radiator is sealed and isolated from the environment.

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