TWM531581U - Liquid supply device and liquid cooling system - Google Patents

Abstract

A liquid supply device includes a casing, a cover, a plunger, a driving unit and a sensing unit. The casing has a liquid outlet. The cover is connected to the casing. A chamber is formed between the casing and the cover. The chamber communicates with the liquid outlet. The plunger is movably disposed in the chamber. The driving unit is disposed in the chamber and used for driving the plunger to move. The sensing unit is selectively disposed on one of the cover and the plunger. The sensing unit outputs a sensing signal according to a current position of the plunger.

Description

Liquid replenishing device and liquid cooling system

The present invention relates to a liquid replenishing device and a liquid cooling system, and more particularly to a liquid replenishing device having a liquid level detecting function and a liquid cooling system having the liquid replenishing device.

In general, the liquid cooling system is mainly composed of a plurality of pipeline connection liquid cooling heads, a radiator, a pump and a liquid storage tank. When the liquid cooling system heats the electronic components, the cooling liquid is pumped into the liquid cooling head by the pump, the cooling liquid absorbs the heat generated by the electronic components, and then the cooling liquid is cooled by the radiator. After the liquid cooling system is used for a long time, the coolant will be reduced due to evaporation of heat, resulting in insufficient coolant. If the user does not replenish the coolant in a timely manner, the cooling system will continue to operate if the coolant is insufficient, and damage may occur.

The present invention provides a liquid replenishing device having a liquid level detecting function and a liquid cooling system having the liquid replenishing device to solve the above problems.

According to an embodiment, the liquid replenishing device of the present invention comprises a casing, a cover, a piston, a driving unit and a sensing unit. The housing has a liquid outlet. The cover is coupled to the housing. A chamber is formed between the housing and the cover, and the chamber is in communication with the liquid outlet. The piston is movably disposed in the chamber. The driving unit is disposed in the chamber, and the driving unit is configured to drive the piston to move. The sensing unit is selectively disposed on one of the cover and the piston. The sensing unit outputs an inductive signal according to the current position of one of the pistons.

According to another embodiment, the liquid replenishing device of the present invention comprises a housing, a cover, a piston, a driving unit, a magnetic tape, and a sensing unit. The housing has a liquid outlet. The cover is coupled to the housing. A chamber is formed between the housing and the cover, and the chamber is in communication with the liquid outlet. The piston is movably disposed in the chamber. The driving unit is disposed in the chamber, and the driving unit is configured to drive the piston to move. The magnetic tape is axially disposed on the housing along one of the housings. The sensing unit is disposed on the piston. The sensing unit senses one of the magnetic field strengths of the magnetic tape and outputs an inductive signal corresponding to the magnetic field strength.

According to another embodiment, the liquid replenishing device of the present invention comprises a housing, a cover, a piston, a driving unit and a sensing unit. The housing has a liquid outlet. The cover is coupled to the housing. A chamber is formed between the housing and the cover, and the chamber is in communication with the liquid outlet. The piston is movably disposed in the chamber. The driving unit is disposed in the chamber, and the driving unit is configured to drive the piston to move. The sensing unit is disposed on the cover. The sensing unit senses a current distance between the piston and the sensing unit and outputs an inductive signal corresponding to the current distance.

According to another embodiment, the liquid cooling system of the present invention includes a liquid replenishing device, a warning unit, and a processing unit. The liquid replenishing device comprises a casing, a cover, a piston, a driving unit and a sensing unit. The housing has a liquid outlet. The cover is coupled to the housing. A chamber is formed between the housing and the cover, and the chamber is in communication with the liquid outlet. The piston is movably disposed in the chamber. The driving unit is disposed in the chamber, and the driving unit is configured to drive the piston to move. The sensing unit is selectively disposed on one of the cover and the piston. The sensing unit outputs an inductive signal according to the current position of one of the pistons. The processing unit is electrically connected to the sensing unit and the warning unit. The processing unit converts the inductive signal to a liquid level and calculates a rate of decrease in the liquid level. When the processing unit determines that the rate of decline is greater than an evapotranspiration rate, the processing unit controls the alert unit to issue a warning message.

According to another embodiment, the liquid cooling system of the present invention includes a liquid replenishing device, a warning unit, a memory unit, and a processing unit. The liquid replenishing device comprises a casing, a cover, a piston, a driving unit and a sensing unit. The housing has a liquid outlet. The cover is coupled to the housing. A chamber is formed between the housing and the cover, and the chamber is in communication with the liquid outlet. The piston is movably disposed in the chamber. The driving unit is disposed in the chamber, and the driving unit is configured to drive the piston to move. The sensing unit is selectively disposed on one of the cover and the piston. The sensing unit outputs an inductive signal according to the current position of one of the pistons. The processing unit is electrically connected to the sensing unit, the warning unit and the memory unit. The processing unit converts the inductive signal to a level. When the liquid cooling system is turned off, the processing unit records the liquid level in the memory unit. When the liquid cooling system is restarted, the processing unit determines whether the decrease in the liquid level is greater than a predetermined threshold. When the processing unit determines that the decrease in the liquid level is greater than the preset threshold, the processing unit controls the warning unit to issue a warning message.

In summary, the creation can selectively connect the liquid replenishing device to specific components in the liquid cooling system (eg, liquid cooling head, radiator, pump, reservoir, piping, etc.), reducing the coolant When the hydraulic pressure in the liquid cooling system is lowered, the liquid replenishing device can drive the piston to move by the driving unit, thereby injecting the cooling liquid in the chamber into the liquid cooling system. In other words, the liquid replenishing device of the present invention can automatically replenish the coolant when the coolant is insufficient, thereby preventing the cooling system from being damaged due to insufficient coolant. In addition, the sensing unit can output an induction signal according to the current position of the piston, and the processing unit can convert the sensing signal into a liquid level, so that the user can grasp the remaining amount of the coolant in the liquid replenishing device at any time. Furthermore, the creation can determine whether the coolant has an abnormal leakage phenomenon by using the rate of decrease and/or the decrease of the liquid level during operation or restart of the liquid cooling system. When it is judged that abnormal leakage of the coolant occurs, the creation may further issue a warning message (for example, light, image, sound, vibration or a combination thereof) to draw the user's attention.

The advantages and spirit of this creation can be further understood by the following detailed description of the creation and the drawings.

Please refer to FIG. 1 to FIG. 4 , FIG. 1 is a functional block diagram of a liquid cooling system 1 according to an embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view of the liquid replenishing device 10 in FIG. 1 , FIG. 3 . FIG. 4 is a graph showing the relationship between the magnetic field strength of the magnetic tape 108 in FIG. 2 and the inductive signal.

As shown in FIG. 1 , the liquid cooling system 1 of the present invention comprises a liquid replenishing device 10 , a warning unit 12 , a memory unit 14 and a processing unit 16 , wherein the processing unit 16 is electrically connected to the sensing of the liquid replenishing device 10 . The unit 110, the warning unit 12 and the memory unit 14. In practical applications, the alert unit 12 can be a light source, a display, a speaker, a vibration motor, or a combination thereof; the memory unit 14 can be a memory or other data storage device; the processing unit 16 can be a processor or controller having a data processing function. . In general, the liquid cooling system 1 is also provided with a liquid cooling head, a radiator, a pump, a reservoir, and a line for connecting the above components. It should be noted that the pump can also be integrated into the liquid cooling head, and the liquid cooling system can selectively or not set the liquid storage tank according to the actual application. When the liquid cooling system is used to dissipate heat from the electronic components, the liquid cooling head of the liquid cooling system is attached to the electronic components. The heat generated by the electronic components is absorbed by the coolant in the liquid cooling head, and the coolant is cooled by the radiator. In addition, the liquid cooling system 1 is also provided with soft and hard components necessary for operation, such as a circuit board, a power supply, an application, a communication module, etc., depending on the actual application.

As shown in FIG. 2, the liquid refilling device 10 of the present invention comprises a housing 100, a cover 102, a piston 104, a driving unit 106, a magnetic tape 108, a sensing unit 110, a circuit board 112 and a gasket. 114. The housing 100 has a liquid outlet 1000. The cover 102 is coupled to the housing 100, and a chamber 116 is formed between the housing 100 and the cover 102. The chamber 116 is in communication with the liquid outlet 1000 and houses a coolant 18. In practical applications, the coolant 18 can be water or other liquid. The piston 104 is movably disposed in the chamber 116. The washer 114 is sleeved on the outer wall of the piston 104 and abuts against the inner wall of the housing 100. Thereby, the gasket 114 prevents the coolant 18 from entering the space between the cover 102 and the piston 104.

In this embodiment, the present invention can selectively connect the liquid replenishing device 10 to a specific component in the liquid cooling system 1 (eg, a liquid cooling head, a radiator, a pump, a reservoir, a pipe, etc.). The liquid outlet 1000 is in communication with a particular element in the liquid cooling system 1 such that the coolant 18 in the chamber 116 can be filled to a particular component in the liquid cooling system 1 via the liquid outlet 1000.

The driving unit 106 is disposed in the chamber 116, and the driving unit 106 is configured to drive the piston 104 to move. In this embodiment, the driving unit 106 can be an elastic member (for example, a spring or other elastic body), and the two ends of the driving unit 106 abut the cover body 102 and the piston 104 respectively. Further, the magnetic tape 108 is axially disposed on one of the housings 100 along one of the housings 100, and the sensing unit 110 is disposed on the piston 104. In this embodiment, the sensing unit 110 can be disposed on the circuit board 112, and the circuit board 112 is disposed on the piston 104 such that the sensing unit 110 is disposed on the piston 104. The sensing unit 110 is configured to sense the magnetic field strength of one of the magnetic tapes 108. In this embodiment, the sensing unit 110 can be a Hall sensor.

As shown in Fig. 2, when the chamber 116 of the liquid refilling device 10 contains the cooling liquid 18, the driving unit 106 is in a compressed state. At this time, the driving unit 106 pushes the piston 104 downward in the chamber 116 until the hydraulic pressure in the liquid cooling system 1 is balanced. When the coolant in the liquid cooling system 1 is reduced to reduce the hydraulic pressure, the driving unit 106 of the liquid replenishing device 10 pushes the piston 104, thereby injecting the cooling liquid 18 in the chamber 116 into a specific component in the liquid cooling system 1 ( For example, liquid cooling heads, radiators, pumps, reservoirs, piping, etc.). In other words, the liquid replenishing device 10 of the present invention can automatically replenish the cooling liquid when the cooling liquid is insufficient, thereby preventing the liquid cooling system 1 from being damaged due to insufficient cooling liquid. It should be noted that, in addition to using the elastic force generated by the driving unit 106 to push the piston 104, the present invention can also use other mechanical components that can generate positive force, shear force, torque or magnetic force to replace the driving unit 106 to push the piston 104. To replenish the coolant.

When the piston 104 is located at a specific position in the chamber 116, the sensing unit 110 senses the magnetic field strength of the magnetic tape 108 and outputs an inductive signal corresponding to the magnetic field strength. In other words, since the sensing unit 110 is disposed on the piston 104, the sensing unit 110 can sense the magnetic field strength of the magnetic tape 108 according to the current position of the piston and output an inductive signal corresponding to the magnetic field strength. As shown in Fig. 3, this creation can magnetize the magnetic field strength of the magnetic tape 108 into a sinusoidal waveform such that the magnetic field strength of the magnetic tape 108 changes sinusoidally. When the sensing unit 110 senses different magnetic field strengths at different positions of the magnetic tape 108, the sensing unit 110 outputs a corresponding voltage level as an inductive signal, as shown in FIG. Then, the processing unit 16 converts the sensing signal output by the sensing unit 110 into the liquid level of the coolant 18 in the chamber 116. In a practical application, the processing unit 16 can output the liquid level of the coolant 18 in the chamber 116 to the display for display. Thereby, the user can grasp the remaining amount of the coolant 18 in the liquid refilling device 10 at any time. It should be noted that, in this creation, the voltage level of the sensing signal and the corresponding liquid level can be made into a comparison table, and the comparison table is stored in the memory unit 14. Thereby, the processing unit 16 can query the comparison table according to the sensing signal output by the sensing unit 110 to obtain the liquid level of the cooling liquid 18 in the chamber 116.

In the embodiment shown in FIG. 1, the processing unit 16 is disposed outside of the liquid refilling device 10. However, in another embodiment, the processing unit 16 may also be disposed inside the liquid refilling device 10, depending on the actual application. In other words, the present invention can convert the sensing signal outputted by the sensing unit 110 into the liquid level of the cooling liquid 18 in the chamber 116 by using the processing unit 16 disposed outside or inside the liquid replenishing device 10. Additionally, a signal transmission line (not shown) of the circuit board 112 can be pulled from the cover 102 to connect the associated components.

Additionally, processing unit 16 may further calculate a rate of decrease in the level of the liquid level. For example, when the liquid level is lowered from H1 to H2 in time T, the rate of decrease in the liquid level is (H1-H2)/T. In addition, the creation can make the evapotranspiration rate of the coolant 18 at different temperatures into a comparison table, and then store the comparison table in the memory unit 14. The processing unit 16 can know the current temperature by a temperature sensor (not shown), and then query the comparison table to obtain an evapotranspiration rate corresponding to the current temperature. When the rate of decrease in the level of the liquid level of the coolant 18 is greater than the rate of evapotranspiration at the current temperature, it is indicated that abnormal leakage of the coolant 18 in the liquid replenishing device 10 may occur. Therefore, when the processing unit 16 determines that the rate of decline is greater than the rate of evapotranspiration at the current temperature, the processing unit 16 can control the alert unit 12 to issue a warning message to draw the user's attention. In this embodiment, the warning message may be light, image, sound, vibration, or a combination thereof, depending on the actual application.

Furthermore, when the liquid cooling system 1 is turned off, the processing unit 16 can record the current liquid level in the memory unit 14. When the liquid cooling system 1 is restarted, the processing unit 16 may first determine whether the decrease in the liquid level is greater than a predetermined threshold. If the reduction of the liquid level is greater than the preset threshold, it indicates that the coolant 18 has abnormally reduced (decreased too much) during shutdown, that is, abnormal water leakage. Therefore, when the processing unit 16 determines that the amount of decrease in the liquid level is greater than the preset threshold, the processing unit 16 can control the warning unit 12 to issue a warning message to draw the user's attention. The above preset threshold can be set according to the actual application.

Please refer to FIG. 5, which is a cross-sectional view of a liquid refilling device 10' according to another embodiment of the present invention. The liquid refilling device 10' is mainly different from the above-described liquid refilling device 10 in that the sensing unit 110' of the liquid refilling device 10' is disposed on the cover body 102, and the liquid replenishing device 10' is not provided with the above-mentioned magnetic tape 108, such as Figure 5 shows. In this embodiment, the sensing unit 110 ′ can be disposed on the circuit board 112 , and the circuit board 112 is disposed on the cover body 102 such that the sensing unit 110 ′ is disposed on the cover body 102 . In this embodiment, the sensing unit 110' can be a proximity sensor or a proximity/ambient light sensor, depending on the application. Therefore, when the piston 104 is located at a specific position in the chamber 116, the sensing unit 110' senses a current distance between the piston 104 and the sensing unit 110' and outputs an inductive signal corresponding to the current distance. The processing unit 16 receives the sensing signal output by the sensing unit 110' to convert the sensing signal into the liquid level of the coolant 18 in the chamber 116. For example, if the cover 102 is spaced from the bottom surface of the housing 100 by a distance D1, the current distance between the piston 104 and the sensing unit 110' is D2, and the thickness of the piston corresponding to the position of the sensing unit 110' is t, the coolant 18 is The liquid level in chamber 116 can be calculated as D1-D2-t. It should be noted that the components of the same reference numerals as those shown in FIG. 2 are substantially the same, and will not be described again. Further, the liquid refilling device 10' can also be applied to the above-described liquid cooling system 1 to perform the above-described warning function.

Please refer to FIG. 6. FIG. 6 is a schematic cross-sectional view of a liquid refilling device 20 according to another embodiment of the present invention. The main difference between the liquid refilling device 20 and the above-described liquid refilling device 10 is that the liquid refilling device 20 replaces the above-described driving unit 106 with a driving unit 206. As shown in FIG. 6, the driving unit 206 includes a first magnetic region 2060 and a second magnetic region 2062. The first magnetic region 2060 is disposed on the cover 102, and the second magnetic region 2062 is disposed on the piston 104, wherein the position of the first magnetic region 2060 corresponds to the position of the second magnetic region 2062. The magnetic pole of the first magnetic region 2060 facing one end of the second magnetic region 2062 and the magnetic pole of the second magnetic region 2062 facing one end of the first magnetic region 2060 are the same, such that a magnetic field is generated between the first magnetic region 2060 and the second magnetic region 2062. Repulsive force. It should be noted that the magnetic pole of the first magnetic region 2060 facing one end of the second magnetic region 2062 and the magnetic pole of the second magnetic region 2062 facing one end of the first magnetic region 2060 may be an N pole or an S pole, depending on the practical application. In this embodiment, the first magnetic region 2060 can be a magnet or an electromagnet, and the second magnetic region 2062 can be a magnet. It should be noted that the components of the same reference numerals as those shown in FIG. 2 have substantially the same operation principle, and are not described herein again.

When the chamber 116 of the liquid refilling device 20 contains the cooling liquid 18, the magnetic repulsive force generated between the first magnetic region 2060 and the second magnetic region 2062 is balanced with the hydraulic pressure generated by the cooling liquid 18. At this time, the piston 104 is stationary in the chamber 116. When the coolant in the liquid cooling system is reduced to reduce the hydraulic pressure, the magnetic repulsion generated between the first magnetic region 2060 and the second magnetic region 2062 pushes the piston 104, thereby injecting the coolant 18 in the chamber 116 into the liquid. Specific components in the cooling system (eg, liquid cooling heads, radiators, pumps, reservoirs, piping, etc.). On the other hand, when the magnetic repulsion force generated between the first magnetic region 2060 and the second magnetic region 2062 and the hydraulic pressure generated by the coolant 18 are again balanced, the piston 104 stops moving.

In summary, the creation can selectively connect the liquid replenishing device to specific components in the liquid cooling system (eg, liquid cooling head, radiator, pump, reservoir, piping, etc.), reducing the coolant When the hydraulic pressure in the liquid cooling system is lowered, the liquid replenishing device can drive the piston to move by the driving unit, thereby injecting the cooling liquid in the chamber into the liquid cooling system. In other words, the liquid replenishing device of the present invention can automatically replenish the coolant when the coolant is insufficient, thereby preventing the cooling system from being damaged due to insufficient coolant. In addition, the sensing unit can output an induction signal according to the current position of the piston, and the processing unit can convert the sensing signal into a liquid level, so that the user can grasp the remaining amount of the coolant in the liquid replenishing device at any time. Furthermore, the creation can determine whether the coolant has an abnormal leakage phenomenon by using the rate of decrease and/or the decrease of the liquid level during operation or restart of the liquid cooling system. When it is judged that abnormal leakage of the coolant occurs, the creation may further issue a warning message (for example, light, image, sound, vibration or a combination thereof) to draw the user's attention.

The above descriptions are only preferred embodiments of the present invention, and all changes and modifications made by the scope of the patent application of the present invention should be covered by the present invention.

1‧‧‧Liquid cooling system
10, 10', 20‧‧‧ liquid replenishing device
12‧‧‧Warning unit
14‧‧‧ memory unit
16‧‧‧Processing unit
18‧‧‧ Coolant
100‧‧‧shell
102‧‧‧ cover
104‧‧‧Piston
106, 206‧‧‧ drive unit
108‧‧‧ Tape
110, 110'‧‧‧ Sensing unit
112‧‧‧Circuit board
114‧‧‧Washers
116‧‧‧ chamber
1000‧‧‧Liquid outlet
2060‧‧‧First magnetic zone
2062‧‧‧Second magnetic zone

Fig. 1 is a functional block diagram of a liquid cooling system according to an embodiment of the present invention. Fig. 2 is a schematic cross-sectional view showing the liquid replenishing device in Fig. 1. Fig. 3 is a graph showing changes in the magnetic field strength of the magnetic tape in Fig. 2. Fig. 4 is a diagram showing the correspondence between the magnetic field strength of the magnetic tape and the sensing signal in Fig. 2. Figure 5 is a schematic cross-sectional view of a liquid refilling device according to another embodiment of the present invention. Figure 6 is a schematic cross-sectional view of a liquid refilling device according to another embodiment of the present invention.

10‧‧‧Liquid replenishing device

18‧‧‧ Coolant

100‧‧‧shell

102‧‧‧ cover

104‧‧‧Piston

106‧‧‧Drive unit

108‧‧‧ Tape

110‧‧‧Sensor unit

112‧‧‧Circuit board

114‧‧‧Washers

116‧‧‧ chamber

1000‧‧‧Liquid outlet

Claims (22)

A liquid replenishing device comprising: a housing having a liquid outlet; a cover coupled to the housing, a chamber formed between the housing and the cover, the chamber being in communication with the liquid outlet a piston movably disposed in the chamber; a driving unit disposed in the chamber, the driving unit is configured to drive the piston to move; and a sensing unit selectively disposed on the cover and the On one of the pistons, the sensing unit outputs an inductive signal based on the current position of one of the pistons. The liquid refilling device of claim 1, wherein the sensing unit is electrically connected to a processing unit, and the processing unit converts the sensing signal into a liquid level. A liquid replenishing device comprising: a housing having a liquid outlet; a cover coupled to the housing, a chamber formed between the housing and the cover, the chamber being in communication with the liquid outlet a piston movably disposed in the chamber; a driving unit disposed in the chamber, the driving unit is configured to drive the piston to move; and a magnetic tape is axially disposed on the housing along one of the housings And a sensing unit disposed on the piston, the sensing unit sensing a magnetic field strength of the magnetic tape and outputting an inductive signal corresponding to the magnetic field strength. The liquid refilling device of claim 3, wherein the sensing unit is electrically connected to a processing unit, and the processing unit converts the sensing signal into a liquid level. The liquid refilling device of claim 3, wherein the sensing unit is a Hall sensor. The liquid refilling device of claim 3, wherein the magnetic field strength of the magnetic tape changes sinusoidally. A liquid replenishing device comprising: a housing having a liquid outlet; a cover coupled to the housing, a chamber formed between the housing and the cover, the chamber being in communication with the liquid outlet a piston movably disposed in the chamber; a driving unit disposed in the chamber, the driving unit is configured to drive the piston to move; and a sensing unit disposed on the cover, the sensing unit Sensing a current distance between the piston and the sensing unit and outputting an inductive signal corresponding to the current distance. The liquid refilling device of claim 7, wherein the sensing unit is electrically connected to a processing unit, and the processing unit converts the sensing signal into a liquid level. The liquid refill device of claim 7, wherein the sensing unit is a proximity sensor. A liquid cooling system comprising: a liquid replenishing device comprising: a housing having a liquid outlet; a cover coupled to the housing, a chamber formed between the housing and the cover, the chamber a chamber is in communication with the liquid outlet; a piston movably disposed in the chamber; a drive unit disposed in the chamber, the drive unit for driving the piston to move; and a sensing unit, optionally The sensing unit is configured to output an inductive signal according to a current position of the piston; a warning unit; and a processing unit electrically connected to the sensing unit and the warning unit, The processing unit converts the sensing signal to a liquid level height and calculates a rate of decrease of the liquid level. When the processing unit determines that the falling rate is greater than an evapotranspiration rate, the processing unit controls the warning unit to issue a warning message. The liquid cooling system of claim 10, further comprising a memory unit electrically connected to the processing unit, wherein when the liquid cooling system is shut down, the processing unit records the liquid level in the memory unit, when the liquid When the cold system is restarted, the processing unit determines whether the decrease in the liquid level is greater than a predetermined threshold. When the processing unit determines that the decrease in the liquid level is greater than the preset threshold, the processing unit Control the alert unit to send the alert message. The liquid cooling system of claim 10, wherein the liquid refilling device further comprises a magnetic tape, the magnetic tape is axially disposed on the housing along one of the housings, the sensing unit is disposed on the piston, the sensing unit A magnetic field strength of the magnetic tape is sensed and the sensing signal corresponding to the magnetic field strength is output. The liquid cooling system of claim 12, wherein the sensing unit is a Hall sensor. The liquid cooling system of claim 12, wherein the magnetic field strength of the magnetic tape changes sinusoidally. The liquid cooling system of claim 10, wherein the sensing unit is disposed on the cover, the sensing unit senses a current distance between the piston and the sensing unit and outputs the sensing signal corresponding to the current distance. The liquid cooling system of claim 15, wherein the sensing unit is a proximity sensor. A liquid cooling system comprising: a liquid replenishing device comprising: a housing having a liquid outlet; a cover coupled to the housing, a chamber formed between the housing and the cover, the chamber a chamber is in communication with the liquid outlet; a piston movably disposed in the chamber; a drive unit disposed in the chamber, the drive unit for driving the piston to move; and a sensing unit, optionally The sensing unit is configured to output an inductive signal according to a current position of the piston; a warning unit; a memory unit; and a processing unit electrically connected to the sensing unit, The warning unit and the memory unit, the processing unit converts the sensing signal into a liquid level height, and when the liquid cooling system is shut down, the processing unit records the liquid level in the memory unit, when the liquid cooling system is re When the device is turned on, the processing unit determines whether the decrease in the liquid level is greater than a predetermined threshold. When the processing unit determines that the decrease in the liquid level is greater than the preset threshold, The processing unit controls the alarm unit to generate an alarm message. The liquid cooling system of claim 17, wherein the liquid refilling device further comprises a magnetic tape, the magnetic tape is axially disposed on the housing along one of the housings, and the sensing unit is disposed on the piston, the sensing unit A magnetic field strength of the magnetic tape is sensed and the sensing signal corresponding to the magnetic field strength is output. The liquid cooling system of claim 18, wherein the sensing unit is a Hall sensor. The liquid cooling system of claim 18, wherein the magnetic field strength of the magnetic tape changes sinusoidally. The liquid cooling system of claim 17, wherein the sensing unit is disposed on the cover, the sensing unit senses a current distance between the piston and the sensing unit and outputs the sensing signal corresponding to the current distance. The liquid cooling system of claim 21, wherein the sensing unit is a proximity sensor.