Multifunctional air pressure stabilizing system of water cooling device

Abstract

The invention relates to a multifunctional air pressure stabilizing system of a water cooling device, which comprises a buffer tank, an air supply pipeline, an exhaust pipeline and a controller, a gyroscope is arranged at the bottom in a tank body of the buffer tank, and a liquid level transmitter and a pressure transmitter are arranged on the buffer tank; the buffer tank is connected with an air compressor through the air supply pipeline; the exhaust pipeline is connected to the top of the buffer tank; the controller is electrically connected with the gyroscope, the liquid level transmitter and the pressure transmitter respectively; the controller can establish a liquid level prediction model of the buffer tank according to data provided by the gyroscope and the temperature transmitter in combination with the inlet valve temperature and the outlet valve temperature of a cooling medium in the water cooling device so as to accurately judge whether the water cooling system leaks or leaks or not. The actual liquid level change in the buffer tank can be obtained, so that the leakage condition of the water cooling system can be effectively judged, and the water cooling system is prevented from rejecting or mistakenly reporting water leakage protection.

Description

Technical Field

[0001] The invention belongs to the field of marine power electronic water cooling systems, and in particular relates to a multifunctional air pressure stabilizing system for a water cooling device. Background Art

[0002] At present, special industry marine power electronic equipment will generate a lot of heat during operation, and the heat needs to be taken away in time. Traditionally, natural wind is generally used for cooling, but this method takes a long time to cool, has a small amount of heat exchange, and has a poor heat dissipation effect. It can only meet the needs of electronic devices with general heat generation, and has a poor heat dissipation effect on electrical devices with larger heat generation. Therefore, general marine power electronic equipment needs to be equipped with corresponding water cooling devices to use cooling media to take away the heat of power electronic equipment.

[0003] Conventional water cooling devices usually use nitrogen pressure stabilization, which is to maintain the system operation within a reasonable pressure range by replenishing and exhausting air during the operation of the water cooling system and to accommodate the volume change of the cooling medium in the valve cooling system caused by temperature change. At present, the nitrogen pressure stabilization system of the water cooling device using nitrogen cylinders as the gas source is a functional component for water cooling device pressure stabilization and system leakage monitoring. If it is used in a marine water cooling device, there are two problems: First, the nitrogen cylinder needs to be replaced in time by the operation and maintenance personnel after it is consumed, and because the marine equipment is far away from the land, the operation and maintenance cost of the water cooling pressure stabilization system is increased; second, the ship is in a swaying and shaking condition for a long time during navigation, and the liquid level height directly sampled by the pressure stabilization device is prone to misjudgment, which makes it easy for the water cooling device to refuse to report or misreport the water leakage protection, and it is impossible to accurately judge the leakage of the water cooling system. Summary of the invention

[0004] The purpose of the present invention is to provide a multifunctional air pressure stabilizing system for a water cooling device, so as to solve the problem of leakage of the water cooling device and inaccurate judgment of the leakage situation.

[0005] A multifunctional air pressure stabilizing system for a water cooling device of the present invention is implemented as follows: A multifunctional air pressure stabilizing system for a water cooling device, comprising: A buffer tank, wherein a gyroscope is installed at the bottom of the tank body, and a liquid level transmitter and a pressure transmitter are arranged on the buffer tank; An air supply pipeline connects the buffer tank to an air compressor; an exhaust pipeline connected to the top of the buffer tank; A controller, which is electrically connected to the gyroscope, the liquid level transmitter and the pressure transmitter respectively; The controller receives the angle signal detected by the gyroscope and the liquid level signal in the buffer tank detected by the liquid level transmitter, and establishes a liquid level prediction model for the buffer tank in combination with the inlet valve temperature and outlet valve temperature of the cooling medium in the water cooling device to determine whether the water cooling system has leaks or seepage.

[0006] Furthermore, the liquid level transmitter is used to monitor the real-time liquid level in the buffer tank to obtain the liquid level measurement value, and the gyroscope is used to detect the deflection angle of the water cooling device around the X-axis, Y-axis and Z-axis.

[0007] Furthermore, the controller is electrically connected to an inlet valve temperature transmitter and an outlet valve temperature transmitter of the water cooling device, the inlet valve temperature transmitter is used to monitor the inlet valve temperature of the cooling medium, and the outlet valve temperature transmitter is used to monitor the outlet valve temperature of the cooling medium.

[0008] Furthermore, according to the liquid level measurement value in the buffer tank, the deflection angles of the water cooling device around the X-axis, the Y-axis and the Z-axis, and the inlet valve temperature and the outlet valve temperature of the cooling medium, the controller establishes a multivariate linear regression prediction model, uses the least squares method to approximate the fitting, obtains the fitting curve, and solves the model coefficient to correct the liquid level measurement value of the buffer tank, and obtains the predicted liquid level value of the buffer tank. Among them, the calculation formula for the predicted value of the buffer tank level is: H = β1R x +β2R y +β3R z +β4T1+β5T2+ε+H0; Among them, H is the predicted liquid level value of the buffer tank, H0 is the measured liquid level value of the buffer tank, β1, β2, β3, β4, β5 are regression coefficients, and R x is the deflection angle of the water cooling device around the X axis, R y is the deflection angle of the water cooling device around the Y axis, R z is the deflection angle of the water cooling device around the Z axis, T1 is the inlet valve temperature of the cooling medium, T2 is the outlet valve temperature of the cooling medium, and ε is the error term.

[0009] Furthermore, when determining whether the water cooling system has a leak: Setting the leakage protection set value and leakage effective time of the water cooling device, and calculating the leakage liquid level change set value of the buffer tank; The predicted value of the liquid level in the buffer tank is obtained according to the calculation formula, and the predicted value is compared with the set value of the liquid level height to determine whether a leak occurs in the water cooling system.

[0010] Furthermore, the current liquid level prediction value is calculated every t1s, and the difference between it and the liquid level prediction value before t2s is used as the liquid level drop rate. When the liquid level drop rate is greater than the liquid level height setting value for n consecutive times, it indicates that the water cooling system is leaking and a trip request is sent to the cooled object. Where, t=t1*n.

[0011] Furthermore, when determining whether the water cooling system is leaking: Set the leakage protection setting value and leakage effective time of the water cooling device, and calculate the leakage level change setting value of the buffer tank; The predicted value of the liquid level in the buffer tank is obtained according to the calculation formula, and the difference between the measured liquid level and the predicted liquid level is calculated. The accumulated liquid level change at a fixed time interval is compared with the set value of the leakage liquid level change to determine whether the water cooling system is leaking.

[0012] Furthermore, the difference between the liquid level measurement value and the liquid level prediction value is calculated every t4min. If the cumulative liquid level change within t5h exceeds the set value of the leakage liquid level change, it indicates that the water cooling system has leaked.

[0013] Furthermore, at least two layers of porous partitions are arranged in the buffer tank.

[0014] Furthermore, the air supply pipeline and the air exhaust pipeline are merged into a main pipeline and connected to the tank top of the buffer tank; An electric air supply valve is installed on the air supply pipeline, and the electric air supply valve is electrically connected to the controller; The exhaust pipeline is provided with an electric exhaust valve I, and the electric exhaust valve I is electrically connected to the controller.

[0015] Furthermore, an exhaust branch is connected to the inlet side of the electric air supply valve on the air supply pipeline, an electric exhaust valve II is installed on the exhaust branch, and the electric exhaust valve II is electrically connected to the controller.

[0016] Furthermore, a one-way valve and a ball valve are installed in sequence on the outlet side of the electric air supply valve on the air supply pipeline; The electric air supply valve and the electric exhaust valve I are normally closed valves, and the electric exhaust valve II is a normally open valve.

[0017] After adopting the above technical solution, the present invention has the following beneficial effects: (1) The present invention adopts an air compressor instead of a nitrogen cylinder as a gas supply method for the gas source, which can avoid the operation and maintenance of frequent replacement of nitrogen cylinders and reduce the operation and maintenance cost when the nitrogen pressure stabilization method is applied to a marine water cooling device; (2) The present invention can effectively monitor the tilt angle of the water cooling device when the ship is traveling by arranging a gyroscope on the tank body of the buffer tank, and then filter out the fluctuation of the buffer tank liquid level caused by the temperature, as well as the influence of the swaying condition of the ship on the fluctuation of the buffer tank liquid level, so as to obtain the actual liquid level change in the buffer tank, thereby effectively judging the leakage of the water cooling system and avoiding the water cooling system refusing to report or falsely reporting leakage protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1It is a structural schematic diagram of a multifunctional air pressure stabilizing system for a water cooling device according to a preferred embodiment of the present invention; Figure 2 It is a schematic diagram of the structure inside the buffer tank of the multifunctional air pressure stabilizing system of the water cooling device of the preferred embodiment of the present invention; Figure 3 This is a control principle diagram of a multifunctional air pressure stabilizing system for a water cooling device according to a preferred embodiment of the present invention; In the figure: buffer tank 1, porous partition 2, gyroscope 3, exhaust pipeline 4, electric exhaust valve I 5, air supply pipeline 6, air compressor 7, electric air supply valve 8, check valve 9, ball valve 10, pressure transmitter 11, exhaust branch 12, electric exhaust valve II 13, liquid level transmitter 14. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] like Figure 1-3 As shown, a multifunctional air pressure stabilizing system for a water cooling device includes a buffer tank 1, an air supply pipeline 6, an exhaust pipeline 4 and a controller. A gyroscope 3 is installed at the bottom of the tank body of the buffer tank 1, and a liquid level transmitter 14 and a pressure transmitter 11 are arranged on the buffer tank 1; the air supply pipeline 6 connects the buffer tank 1 with an air compressor 7; the exhaust pipeline 4 is connected to the top of the buffer tank 1; the controller is electrically connected to the gyroscope 3, the liquid level transmitter 14 and the pressure transmitter 11 respectively; the controller receives the angle signal detected by the gyroscope 3, the liquid level signal in the buffer tank 1 detected by the liquid level transmitter 14, and establishes a liquid level prediction model for the buffer tank 1 in combination with the inlet valve temperature and the outlet valve temperature of the cooling medium in the water cooling device, so as to determine whether the water cooling system leaks or seeps.

[0023] Among them, in the cooling system, the leakage rate is at least 15L / h. When a leakage occurs, the cooled object will immediately alarm. When the leakage is serious, it will directly cause the cooled object to trip.

[0024] Leakage refers to a slight seepage of liquid, and the leakage rate is usually 0.1L / min. In a short period of time, its impact on the liquid level height in the buffer tank 11 is relatively subtle and usually does not directly affect the normal operation of the system. However, after a long period of leakage, it will also have a greater impact on the liquid level fluctuation in the buffer tank 11.

[0025] In the present invention, the air machine is used to replenish air into the buffer tank 1, and the exhaust pipe 4 is used to discharge the gas in the buffer tank 1. By changing the amount of air in the buffer tank 1, the pressure in the buffer tank 1 is maintained within a certain range, so that the pressure of the cooling medium in the ship's water cooling device is maintained within a certain range, that is, the effect of stabilizing the pressure of the water cooling system is achieved.

[0026] The liquid level transmitter 14 is used to monitor the real-time liquid level in the buffer tank 1 to obtain a liquid level measurement value.

[0027] Specifically, the liquid level transmitter 14 is a capacitive type and is placed in the center of the tank body, so as to reduce the influence of the swaying condition of the ship on the liquid level of the buffer tank 11 as much as possible, so as to improve the accuracy of the liquid level measurement value measured by the liquid level transmitter 14.

[0028] The gyroscope 3 is used to monitor the deflection angle of the water cooling device. Specifically, the gyroscope 3 is used to monitor the deflection angle of the water cooling device around the X-axis, the Y-axis and the Z-axis.

[0029] The gyroscope 3 is fixed to the inner bottom of the buffer tank 1 by bolts.

[0030] Specifically, a mesh plate located in the radial direction (ie, horizontally arranged) of the buffer tank 1 may be provided at the bottom center of the buffer tank 1 , and the gyroscope 3 may be mounted on the mesh plate by bolts so as to be located at the bottom center of the buffer tank 1 .

[0031] Since the temperature change of the cooling medium will also cause the liquid level change of the buffer tank 1, in order to eliminate this influence, it is necessary to obtain the temperature change of the cooling medium. Therefore, the controller is electrically connected to the inlet valve temperature transmitter and the outlet valve temperature transmitter of the water cooling device. The inlet valve temperature transmitter is used to monitor the inlet valve temperature of the cooling medium, and the outlet valve temperature transmitter is used to monitor the outlet valve temperature of the cooling medium.

[0032] According to the liquid level measurement value in the buffer tank 1, the deflection angles of the water cooling device around the X-axis, Y-axis and Z-axis, and the inlet valve temperature and outlet valve temperature of the cooling medium, the controller establishes a multivariate linear regression prediction model, uses the least squares method to approximate the fitting, obtains the fitting curve, and solves the model coefficient to correct the liquid level measurement value of the buffer tank 1 to obtain the predicted liquid level value of the buffer tank 1, that is, the actual liquid level value of the buffer tank 1 when it is not deflected.

[0033] Among them, the calculation formula for the predicted value of the liquid level of buffer tank 1 is: H = β1R x +β2R y +β3R z +β4T1+β5T2+ε+H0; Among them, H is the predicted liquid level value of buffer tank 1 (in cm), H0 is the measured liquid level value of buffer tank 1 (in cm), β1, β2, β3, β4, β5 are regression coefficients, and R x is the deflection angle of the water cooling device around the X axis, R y is the deflection angle of the water cooling device around the Y axis, R z is the deflection angle of the water cooling device around the Z axis, T1 is the inlet valve temperature of the cooling medium, T2 is the outlet valve temperature of the cooling medium, and ε is the error term.

[0034] The fitting curve is obtained according to the experiment to obtain the regression coefficient and error term.

[0035] Specifically, the actual liquid level value of buffer tank 1 when it is not tilted is obtained (which is used as the predicted liquid level value of buffer tank 1), and then the buffer tank 1 is tilted to a set angle, and the liquid level measurement value in this state is obtained, and the inlet valve temperature and outlet valve temperature of the cooling medium are combined to form a set of experimental data. Then, multiple sets of experimental data are fitted into curves, and the regression coefficient and error term can be calculated to obtain a complete calculation formula for the predicted value of the liquid level of buffer tank 1.

[0036] By using the above calculation formula, the predicted value of the liquid level of buffer tank 1 can be calculated when the measured value of the liquid level of buffer tank 1, the inclination angle of buffer tank 1, and the inlet valve temperature and outlet valve temperature of the cooling medium are known.

[0037] When determining whether the water cooling system has a leak: The leakage protection constant value and leakage effective time of the water cooling device are set, and the leakage liquid level change set value of the buffer tank 1 is calculated.

[0038] The predicted value of the liquid level of the buffer tank 1 is obtained according to the calculation formula, and the predicted value of the liquid level is compared with the set value of the liquid level height to determine whether a leak occurs in the water cooling system.

[0039] The product of the leakage protection constant and the leakage effective time is the leakage amount of the cooling medium, and the leakage amount divided by the cross-sectional area of ​​the buffer tank 1 is equal to the leakage liquid level change set value.

[0040] The leakage protection setting value is set according to the maximum leakage flow allowed by the cooled object (such as marine power electronic equipment), which can be set in accordance with international standards or specific parameters of the cooled object. The leakage protection effective time can be set according to relevant experiments on the cooled object.

[0041] Specifically, the current liquid level prediction value is calculated every t1s, and the difference between it and the liquid level prediction value before t2s is used as the liquid level drop rate. When the liquid level drop rate is greater than the liquid level height setting value for n consecutive times, it indicates that the water cooling system is leaking and a trip request is sent to the cooled object; Where, t=t1*n.

[0042] The value range of t1 is 1-4, and the preferred value is 2; The value range of t2 is 8-12, and the preferred value is 10; The value range of n is 10-20, and the preferred value is 15.

[0043] Taking t1=2, t2=10, n=15 as an example, then t=2*15=30, that is, the current liquid level prediction value is calculated every 2 seconds, and the difference between it and the liquid level prediction value 10 seconds ago is taken as the liquid level drop rate. When the liquid level drop rate is greater than the leakage liquid level change set value for 15 consecutive times, it indicates that the water cooling system is leaking and a trip request is sent to the protected object.

[0044] The specific judgment process embodiment is as follows: Through experimental fitting into a curve, the regression coefficients β1, β2, β3, β4, and β5 in the calculation formula of the liquid level prediction value of the buffer tank 1 are 0.121, 0.125, 0.241, -0.09, and -0.05, respectively, and the error term ε is 0.01. Among them, the R measured by the gyroscope 3 x (Deflection angle of the water cooling device around the X axis) is 8.7°, R y (Deflection angle of the water cooling device around the Y axis) is 9.5°, R z The deflection angle of the water cooling device around the Z axis is 3.2°. Substituting the above parameters into the calculation formula is as follows: H = β1R x +β2R y +β3R z +β4T1+β5T2+ε+H0 =0.121*8.7+0.125*9.5+0.241*3.2-0.09*26.3-0.05*32.1+0.01+28.2 ≈27.25cm; To determine whether a water cooling system leaks: Set the leakage protection value X1 of the water cooling device to 15L / h and the leakage effective time X2 to 30s. Since the cross-sectional area S of the buffer tank 1 is 356cm 2 , then the leakage liquid level change value X3=(X1*X2) / S=(15*1000 / 3600*30) / 356≈0.35cm is calculated.

[0045] According to the liquid level measurement value of the buffer tank 1 monitored in real time by the liquid level transmitter 14, the deflection angle of the water cooling device around the X-axis, Y-axis and Z-axis monitored in real time by the gyroscope 3, and the inlet valve temperature and outlet valve temperature of the cooling medium, the above calculation formula is substituted, and the current liquid level prediction value is calculated every 2 seconds. The difference between it and the liquid level prediction value 10 seconds ago is taken as the liquid level drop rate. When the liquid level drop rate is greater than 0.35cm for 15 consecutive times, it indicates that the water cooling system is leaking and a trip request is sent to the protected object.

[0046] When the liquid level drop rate is not greater than the leakage level change setting value for the first time in 15 times, the number of times is reset to zero and a new round of cycle calculation is performed again, that is, the next time is the first time in the next cycle (15 consecutive times).

[0047] When judging whether the water cooling system is leaking: Set the leakage protection constant value and leakage effective time of the water cooling device, and calculate the leakage liquid level change set value of buffer tank 1.

[0048] The predicted value of the liquid level of buffer tank 1 is obtained according to the calculation formula, and the difference between the measured liquid level value and the predicted liquid level value is calculated. The accumulated liquid level change at a fixed time interval is compared with the set value of the leakage liquid level change to determine whether the water cooling system is leaking.

[0049] The product of the leakage protection constant and the leakage effective time is the leakage amount of the cooling medium, and the leakage amount divided by the cross-sectional area of ​​the buffer tank 1 is equal to the leakage level change set value.

[0050] The leakage protection setting value is set according to the maximum leakage flow allowed by the cooled object (such as marine power electronic equipment), which can be set in accordance with international standards or specific parameters of the cooled object. The leakage protection effective time can be set according to relevant experiments on the cooled object.

[0051] Specifically, the difference between the liquid level measurement value and the liquid level prediction value is calculated every t4min. If the cumulative liquid level change within t5h exceeds the set value of the leakage liquid level change, it indicates that the water cooling system is leaking.

[0052] Among them, the value range of t4 is 1-4, and the preferred value is 2; The value range of T5 is 18-30, and the preferred value is 24.

[0053] Taking t4=2, t5=24 as an example, the difference between the liquid level measurement value and the liquid level prediction value is calculated every 2 minutes. If the cumulative liquid level change in 24 hours exceeds the leakage level change set value, it indicates that the water cooling system is leaking.

[0054] The specific judgment process embodiment is as follows: Through experimental fitting into a curve, the regression coefficients β1, β2, β3, β4, and β5 in the calculation formula of the liquid level prediction value of the buffer tank 1 are 0.121, 0.125, 0.241, -0.09, and -0.05, respectively, and the error term ε is 0.01. Among them, the R measured by the gyroscope 3 x (Deflection angle of the water cooling device around the X axis) is 8.7°, R y (Deflection angle of the water cooling device around the Y axis) is 9.5°, R z The deflection angle of the water cooling device around the Z axis is 3.2°. Substituting the above parameters into the calculation formula is as follows: H = β1R x +β2R y +β3R z +β4T1+β5T2+ε+H0 =0.121*8.7+0.125*9.5+0.241*3.2-0.09*26.3-0.05*32.1+0.01+28.2 ≈27.25cm; When judging whether the water cooling system is leaking: Set the leakage protection constant value Y1 of the water cooling device to 0.1L / h and the leakage effective time Y2 to 24h. Since the cross-sectional area S of the buffer tank 1 is 356cm 2 , then the calculated leakage level change setting value is Y3=(Y1*Y2) / S=(0.1*1000*24) / 356≈6.74cm.

[0055] According to the liquid level measurement value of the buffer tank 1 monitored in real time by the liquid level transmitter 14, the deflection angle of the water cooling device around the X-axis, Y-axis and Z-axis monitored in real time by the gyroscope 3, and the inlet valve temperature and outlet valve temperature of the cooling medium, the above calculation formula is substituted and the difference between the liquid level measurement value and the liquid level prediction value is calculated every 2 minutes. If the cumulative liquid level change in 24 hours exceeds 6.74 cm, it indicates that the water cooling system is leaking.

[0056] In order to reduce the liquid level fluctuation caused by the bumping and shaking of the ship during travel, at least two layers of porous partitions 2 are arranged in the buffer tank 1.

[0057] In order to reduce the number of pipeline connection points on the buffer tank 1 and improve the sealing performance of the buffer tank 1 , the air supply pipeline 6 and the exhaust pipeline 4 are merged into a main pipeline and connected to the tank top of the buffer tank 1 .

[0058] The pressure transmitter 11 is installed at one end of the air supply pipeline 6 close to the main pipeline, so as to monitor the pressure change in the buffer tank 1 in real time.

[0059] In order to realize automatic control of the on-off of the air supply pipeline 6, an electric air supply valve 8 is installed on the air supply pipeline 6, and the electric air supply valve 8 is electrically connected to the controller.

[0060] The controller can automatically control the opening and closing of the electric air supply valve 8.

[0061] In order to realize automatic control of the on and off of the exhaust pipeline 4, an electric exhaust valve I5 is provided on the exhaust pipeline 4, and the electric exhaust valve I5 is electrically connected to the controller.

[0062] The controller can automatically control the opening and closing of the electric exhaust valve Ⅰ5.

[0063] After the air replenishment is completed, in order to facilitate the discharge of excess gas in the air replenishment pipeline 6, an exhaust branch 12 is connected to the inlet side of the electric air replenishment valve 8 on the air replenishment pipeline 6, and an electric exhaust valve II 13 is installed on the exhaust branch 12, and the electric exhaust valve II 13 is electrically connected to the controller.

[0064] The controller can automatically control the opening and closing of the electric exhaust valve II13.

[0065] Preferably, the electric air supply valve 8, the electric exhaust valve II 13 and the air compressor 7 are connected via a three-way valve, which can reduce the number of interfaces provided on the air supply pipeline 6, thereby simplifying the structure of the air supply pipeline 6 and facilitating the connection of the pipeline.

[0066] In order to prevent the medium in the buffer tank 1 from flowing back into the gas circuit and causing damage to related components in the gas circuit, a one-way valve 9 and a ball valve 10 are installed in sequence on the outlet side of the electric gas supply valve 8 on the gas supply pipeline 6.

[0067] Specifically, the setting of the one-way valve 9 can prevent the cooling medium from flowing back into the air supply pipeline 6 and causing damage to the air compressor 7 .

[0068] The ball valve 10 is a normally open valve. When the electric air supply valve 8 or the one-way valve 9 in the air supply pipeline 6 fails, the ball valve 10 can be manually closed to close the air supply pipeline 6.

[0069] In order to simplify the automatic control process, the electric air supply valve 8 and the electric exhaust valve I5 are normally closed valves, and the electric exhaust valve II 13 is a normally open valve.

[0070] The preset pressure value in the buffer tank 1 is set in advance to A MPa, and the pressure transmitter 11 monitors the pressure change in the buffer tank 1 in real time and transmits the pressure signal to the controller.

[0071] When the pressure in the buffer tank 1 is lower than the preset pressure value A-0.03MPa, the controller starts the air compressor 7, opens the electric air supply valve 8 and closes the electric exhaust valve II13 to supply air to the buffer tank 1 until the pressure in the buffer tank 1 reaches the preset pressure value AMPa, then closes the electric air supply valve 8 to stop supplying air, and opens the electric exhaust valve II13 to discharge the excess gas in the air supply pipeline 6 through the exhaust branch 12. During the whole process, the electric exhaust valve I5 remains normally closed and does not operate.

[0072] When the pressure in the buffer tank 1 is higher than the preset pressure value A+0.02MPa, the controller opens the electric exhaust valve I5 to discharge the gas in the buffer tank 1 until the pressure in the buffer tank 1 reaches the preset pressure value A MPa. During the entire exhaust process, the air compressor 7 does not operate, the electric air supply valve 8 remains normally closed and does not operate, and the electric exhaust valve II13 remains normally open and does not operate.

[0073] The multifunctional air pressure stabilization system for the water cooling device of the present invention adopts the air compressor 7 as the pressure stabilization and air supply source, and realizes the air pressure stabilization function under the control of the controller, which not only meets the demand for system pressure stabilization for the long-term stable operation of the water cooling device, but also avoids frequent operation and maintenance of the pressure stabilization system, and reduces the operation and maintenance cost of the nitrogen pressure stabilization method when applied to marine equipment. At the same time, the controller can filter out the influence of the swaying condition of the ship during driving on the liquid level fluctuation and the liquid level fluctuation caused by the temperature through the multivariate linear regression prediction model and the least squares approximation fitting solution method, and can effectively and accurately determine the leakage of the water cooling system, and avoid the water cooling device from missing or falsely reporting the water leakage alarm.

[0074] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A multifunctional air pressure stabilizing system for a water cooling device, characterized in that: include A buffer tank, wherein a gyroscope is installed at the bottom of the tank body, and a liquid level transmitter and a pressure transmitter are arranged on the buffer tank; An air supply pipeline connects the buffer tank to an air compressor; an exhaust pipeline connected to the top of the buffer tank; A controller, which is electrically connected to the gyroscope, the liquid level transmitter and the pressure transmitter respectively; The controller receives the angle signal detected by the gyroscope and the liquid level signal in the buffer tank detected by the liquid level transmitter, and establishes a liquid level prediction model for the buffer tank in combination with the inlet valve temperature and outlet valve temperature of the cooling medium in the water cooling device to determine whether the water cooling system has leaks or seepage.

2. The multifunctional air pressure stabilizing system for water cooling device according to claim 1, characterized in that: The liquid level transmitter is used to monitor the real-time liquid level in the buffer tank to obtain the liquid level measurement value, and the gyroscope is used to detect the deflection angle of the water cooling device around the X-axis, the Y-axis and the Z-axis.

3. The multifunctional air pressure stabilizing system for water cooling device according to claim 2, characterized in that: The controller is electrically connected to an inlet valve temperature transmitter and an outlet valve temperature transmitter of the water cooling device, the inlet valve temperature transmitter is used to monitor the inlet valve temperature of the cooling medium, and the outlet valve temperature transmitter is used to monitor the outlet valve temperature of the cooling medium.

4. The multifunctional air pressure stabilizing system for water cooling device according to claim 3, characterized in that: According to the liquid level measurement value in the buffer tank, the deflection angle of the water cooling device around the X-axis, the Y-axis and the Z-axis, and the inlet valve temperature and the outlet valve temperature of the cooling medium, the controller establishes a multivariate linear regression prediction model, uses the least squares method to approximate the fitting, obtains the fitting curve, and solves the model coefficient to correct the liquid level measurement value of the buffer tank, and obtains the predicted liquid level value of the buffer tank. Among them, the calculation formula for the predicted value of the buffer tank level is: H=β1R x +β2R y +β3R z +β4T1+β5 T2+ε+H0; Among them, H is the predicted liquid level value of the buffer tank, H0 is the measured liquid level value of the buffer tank, β1, β2, β3, β4, β5 are regression coefficients, and R x is the deflection angle of the water cooling device around the X axis, R y is the deflection angle of the water cooling device around the Y axis, R z is the deflection angle of the water cooling device around the Z axis, T1 is the inlet valve temperature of the cooling medium, T2 is the outlet valve temperature of the cooling medium, and ε is the error term.

5. The multifunctional air pressure stabilizing system for water cooling device according to claim 4, characterized in that: When determining whether the water cooling system has a leak: Setting the leakage protection set value and leakage effective time of the water cooling device, and calculating the leakage liquid level change set value of the buffer tank; The predicted value of the liquid level in the buffer tank is obtained according to the calculation formula, and the predicted value is compared with the set value of the liquid level height to determine whether a leak occurs in the water cooling system.

6. The multifunctional air pressure stabilizing system for water cooling device according to claim 5, characterized in that: The current liquid level prediction value is calculated every t1s, and the difference between it and the liquid level prediction value t2s ago is used as the liquid level drop rate. When the liquid level drop rate is greater than the liquid level height setting value for n consecutive times, it indicates that the water cooling system is leaking and a trip request is sent to the cooled object. Where, t=t1*n.

7. The multifunctional air pressure stabilizing system for water cooling device according to claim 4, characterized in that: When judging whether the water cooling system is leaking: Set the leakage protection setting value and leakage effective time of the water cooling device, and calculate the leakage level change setting value of the buffer tank; The predicted value of the liquid level in the buffer tank is obtained according to the calculation formula, and the difference between the measured liquid level and the predicted liquid level is calculated. The accumulated liquid level change at a fixed time interval is compared with the set value of the leakage liquid level change to determine whether the water cooling system is leaking.

8. The multifunctional air pressure stabilizing system for water cooling device according to claim 7, characterized in that: The difference between the measured liquid level and the predicted liquid level is calculated every t4min. If the cumulative liquid level change within t5h exceeds the set value of the leakage liquid level change, it indicates that a leak has occurred in the water cooling system.

9. The multifunctional air pressure stabilizing system for water cooling device according to claim 1, characterized in that: At least two layers of porous partitions are arranged in the buffer tank.

10. The multifunctional air pressure stabilizing system for water cooling device according to claim 1, characterized in that: The air supply pipeline and the air exhaust pipeline are merged into a main pipeline and connected to the tank top of the buffer tank; An electric air supply valve is installed on the air supply pipeline, and the electric air supply valve is electrically connected to the controller; The exhaust pipeline is provided with an electric exhaust valve I, and the electric exhaust valve I is electrically connected to the controller.

11. The multifunctional air pressure stabilizing system for water cooling device according to claim 10, characterized in that: An exhaust branch is connected to the inlet side of the electric air supply valve on the air supply pipeline, an electric exhaust valve II is installed on the exhaust branch, and the electric exhaust valve II is electrically connected to the controller.

12. The multifunctional air pressure stabilizing system for water cooling device according to claim 11, characterized in that: A one-way valve and a ball valve are installed in sequence on the outlet side of the electric air supply valve on the air supply pipeline; The electric air supply valve and the electric exhaust valve I are normally closed valves, and the electric exhaust valve II is a normally open valve.

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