A leak-proof water supply valve for a closed circulation system and a detection method thereof

Abstract

The present invention relates to the field of valves, and is a leak-proof water-filling valve for a closed circulation system, comprising a valve body, provided with a fluid medium inlet and a fluid medium outlet, wherein a medium channel is formed between the fluid medium inlet and the fluid medium outlet; a ball valve assembly, which is placed in the valve body and controls the flow and disconnection of the medium channel; a pressure sensor, which is placed in the medium channel downstream of the ball valve assembly and the one-way valve plate, and is used to detect fluid pressure parameters, which can characterize the medium characteristics in the closed circulation system; a flow sensor, which is placed in the medium channel downstream or upstream of the valve core assembly, and is used to detect the flow of the replenished fluid; a controller, which compares and logically infers the feedback data of the sensor with the preset data of the system, and controls the action of the ball valve assembly based on the comparison and logical inference results. The leak-proof water-filling valve is used to monitor the total amount of replenished medium and the system medium pressure in the closed circulation system, and the controller automatically controls the action of the ball valve assembly according to the monitoring results, thereby realizing the functions of automatically replenishing the medium and correctly judging whether the system is leaking.

Description

Technical Field

[0001] The present invention relates to the field of valves, and in particular to a device for replenishing water, air, oil or other media in a closed circulation system, and more particularly to a device for timely closing the device and giving a control signal and an alarm signal when a leak occurs in the closed system. Background Art

[0002] The valve is a control component in the fluid conveying system, which has the functions of cutting off, regulating, guiding, preventing backflow, stabilizing pressure, diverting or overflowing pressure relief. For example, the prior art disclosed in the utility model patent with the authorization announcement number CN205980165U includes a device, which includes a micro switch placed at the front end of the electric valve, and the control unit determines that the closed system is leaking only based on its 30S signal, and the accuracy is very poor. For example, it will malfunction when there is an external water cut-off and a slight leak in the system. A device disclosed in the utility model patent with the authorization application number 201621355876.9 includes a magnetic switch and a control panel for detecting water flow cut-off, and sets a time to determine whether there is a leak. Obviously, it cannot prevent short-term large flow leakage, and the time limit brings inconvenience to use. It also does not have the function of replenishing water, air, oil or other media for the closed system. The utility model patent with the authorization application number 201620247963.6 discloses a device, which includes a flow metering device and a control panel. The electric-controlled anti-leakage valve ensures normal water use by quantitatively controlling a single continuous water supply. When the set water consumption is exceeded, it is judged as an accidental water leakage or water leakage, which cannot adapt to places with large fluctuations in water consumption. Therefore, the valves in the prior art still have defects and do not have the following functions at the same time: 1) Normally replenish water, air, oil or other substances for the closed system, 2) Timely detect and alarm when a closed system leaks, 3) Fault tolerance when a small leak occurs in the system but the leak point cannot be found, and the leak does not cause intolerable losses. Summary of the invention

[0003] In order to solve the above problems, the purpose of the present invention is to provide a leak-proof water-making valve for a closed circulation system and a detection and control method thereof, wherein the flow sensor in the leak-proof water-making valve is used to monitor the total amount of medium replenishment in the closed circulation system, and the pressure sensor is used to monitor the medium pressure in the closed circulation system, and the controller automatically controls the action of the valve core assembly according to the monitoring result, thereby realizing the functions of automatically replenishing the medium, timely detecting system leakage and cutting off the medium replenishment source to prevent larger leakage.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0005] A leak-proof water supply valve for a closed circulation system, characterized in that:

[0006] The valve body is provided with a fluid medium inlet and a fluid medium outlet, and a medium channel is formed between the fluid medium inlet and the fluid medium outlet;

[0007] The valve core assembly is placed in the valve body and controls the flow and disconnection of the medium channel;

[0008] A pressure sensor is placed above the medium channel downstream of the valve core assembly and is used to detect a pressure parameter of the fluid, which can characterize the medium characteristics in the closed circulation system;

[0009] A flow sensor is placed in the medium channel downstream of the valve core assembly and is used to detect the flow parameter of the fluid, which can characterize the medium characteristics in the closed circulation system;

[0010] The controller compares the feedback data from the sensor with the preset data of the system, and controls the action of the valve core assembly based on the comparison result.

[0011] Preferably, the pressure sensor detects the fluid pressure parameter in the closed circulation system. In this technical solution, the fluid pressure parameter detected by the pressure sensor is the fluid pressure; when the fluid pressure is at a normal pressure value, it means that the closed circulation system is in a normal working state; and when the fluid pressure value decreases rapidly, it means that the closed circulation system may be in a leaking state; and when the fluid pressure value drops slightly frequently and multiple times, it means that the closed circulation system may be in a micro-leakage state; further combined with the action of the valve core assembly, it can be determined whether the system is actually leaking.

[0012] Preferably, the flow sensor detects the fluid replenishment quantity parameter in the closed circulation system. In this technical solution, the fluid replenishment quantity parameter detected by the flow sensor; when the fluid replenishment quantity is at a normal value, it means that the closed circulation system is in a normal working state; and when the fluid replenishment quantity value becomes larger, it means that the closed circulation system may be in a leaking state. Further combined with the combined action of the valve core assembly and the pressure sensor, it can be clearly determined whether the system is in a state of large leakage, medium leakage, slight leakage, etc. or is still in a normal state.

[0013] Preferably, a one-way valve assembly is further included, which is placed in the medium channel downstream of the valve core assembly and automatically adjusts its opening angle according to the medium pressure upstream and downstream thereof.

[0014] Preferably, the one-way valve assembly includes a one-way valve disc and a torsion spring, and a one-way valve port is provided inside the valve body; one end of the one-way valve disc is hinged on one side of the one-way valve port, and the torsion spring is provided on the hinged end of the one-way valve disc; the force of the torsion spring on the one-way valve disc drives the one-way valve disc to close the one-way valve port. In the above technical scheme, the one-way valve disc is driven by the torsion spring, but the elasticity of the torsion spring is relatively small. When the fluid pressure downstream of the one-way valve port plus the elastic force of the torsion spring is less than the fluid pressure upstream of the one-way valve port, the one-way valve disc is driven by the power of the fluid to rotate and open. When the fluid pressure downstream of the one-way valve port plus the elastic force of the torsion spring is greater than the fluid pressure upstream of the one-way valve port, the reverse pressure of the fluid plus the elastic force of the torsion spring will drive the one-way valve disc to close the one-way valve port; thereby preventing the fluid from flowing back and limiting the medium to flow in only one direction. When the fluid pressure at the one-way valve port is small, the torsion spring will exert force on the one-way valve plate, thereby maintaining the appropriate opening of the one-way valve plate. The water flow adjusted by the one-way valve plate with appropriate opening can effectively prevent the generation of turbulence, so that the pressure sensor can detect the correct value; the water flow direction adjusted by the one-way valve plate with appropriate opening is controlled, so that the flow sensor can detect smaller flow data.

[0015] Preferably, the maximum opening angle of the one-way valve is 75°.

[0016] Preferably, the flow sensor includes an impeller, a flow chamber is provided inside the valve body downstream of the one-way valve port, an impeller is arranged in the flow chamber, and the wheel center of the impeller is eccentrically arranged with the center line of the medium channel; the one-way valve plate guides the fluid obliquely to the outer edge of the impeller blade when in the open state. In this technical solution, the one-way valve plate has a guiding effect on the fluid in the open state, so that the fluid is focused on one side of the medium channel, and at the same time guides it to flow to the outer edge of the impeller blade, thereby increasing the power to drive the impeller to rotate. Electronic components are installed on the impeller assembly, and the rotation of the impeller causes the electrical signal of the device to change. The signal is output to the single-chip CPU, and after data processing, it is used as the measurement value of the flow sensor for control.

[0017] Preferably, the pressure point of the pressure sensor is arranged in the non-turbulent area on the downstream side of the valve core assembly and the one-way valve. The pressure point of the pressure sensor is on the open side of the one-way valve disc; in this solution, when the one-way valve disc is in a closed state, the pressure point of the pressure sensor is in a closed circulation system, and the pressure of the fluid medium in the closed circulation system can be monitored; and when the one-way valve disc is in an open state, the pressure point of the sensor is in the one-way valve disc's guide area for the medium, and the performance parameters of the fluid medium can be monitored in real time.

[0018] Preferably, a filter screen is provided on the fluid medium inlet of the valve body to prevent foreign matter from entering the closed circulation system.

[0019] Preferably, the valve core assembly includes a spherical valve core, a valve stem connected to the spherical valve core, and a motor and a reducer for driving the valve stem and the spherical valve core.

[0020] Preferably, the valve core assembly includes a diaphragm core, a valve stem connected to the diaphragm core, and a coil, a spring and a magnet for driving the valve stem and the diaphragm core.

[0021] A method for detecting leak-proof water replenishment in a closed circulation system, characterized in that: the leak-proof water replenishment valve as described above is used; and the following comparison method is adopted:

[0022] 1) Compare the fluid pressure parameter detected by the pressure sensor with the fluid pressure parameter of the closed circulation system under normal conditions;

[0023] 2) When the fluid pressure parameter is higher than the normal value, the controller drives the valve core assembly to close.

[0024] 3) When the fluid pressure parameter is lower than the normal value, the controller drives the valve core assembly to add medium from the outside; if the fluid pressure parameter is restored, the added medium is considered normal; if too much medium is added or the sensor value does not return to normal, the controller drives the valve core assembly to operate and monitor the measured value of the pressure sensor. If it continues to be at an abnormal value, it is determined to be a leak;

[0025] 4) When there is a leak, the controller distinguishes between large leaks and small leaks based on the data from the flow sensor;

[0026] 5) When there is a leakage, the controller starts the valve core assembly, gives a fault contact signal and triggers an alarm;

[0027] 6) When a small leak occurs in the system and the controller sounds an alarm, but the user cannot find the leak point after verification and confirms that the leak has not caused intolerable losses, the user can press the "fault tolerance button" and the intelligent leak-proof water supply valve will ignore the small leak and allow the system to work normally.

[0028] A method for detecting leak-proof water replenishment in a closed circulation system, characterized in that: the leak-proof water replenishment valve as described above is used; and the following comparison method is adopted:

[0029] 1) The controller drives the valve core assembly to operate, so that the system is always in a state of preparing to add medium. If the measured value of the pressure sensor drops out of the normal value during this period, it is judged as leakage; if the amount of medium added is within the control value, it is considered normal;

[0030] 2) If too much medium is added, the controller drives the valve core assembly to operate and monitors the measured value of the pressure sensor. The fluid pressure parameter detected by the pressure sensor is compared with the fluid pressure parameter of the closed circulation system under normal conditions. If it is lower than the normal value, it is judged as a leak; if it is still within the normal value range, it is judged that the system is normal and the action of 1) is continued;

[0031] 3) When there is a leak, the controller distinguishes between large leaks and small leaks based on the data from the flow sensor;

[0032] 4) When there is a leakage, the controller starts the valve core assembly to give a fault contact signal and trigger an alarm;

[0033] 5) When a small leak occurs in the system and the controller sounds an alarm, but the user cannot find the leak point after verification and confirms that the leak has not caused intolerable losses, the user can press the "fault tolerance button" and the intelligent leak-proof water supply valve will ignore the small leak and allow the system to work normally.

[0034] The present invention adopts the above-mentioned technical scheme, which on the one hand relates to a leak-proof water replenishment valve for a closed circulation system, and on the other hand relates to a leak-proof water replenishment detection method for a closed circulation system; the flow sensor and pressure sensor in the leak-proof water replenishment valve respectively monitor the total amount of medium replenishment and pressure parameters in the closed circulation system, and when the total amount of medium or pressure change in the closed circulation system is monitored, the controller automatically controls the action of the valve core assembly according to the monitoring result, repeatedly monitors the total amount of medium replenishment and pressure parameters in the closed circulation system, and compares with the built-in parameters and logical reasoning to determine whether the closed circulation system is normally replenishing the medium or leaking; thereby realizing the functions of automatically replenishing the medium, timely detecting leakage and alarming. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the three-dimensional structure of the leak-proof water supply valve.

[0036] Figure 2 It is a side sectional view of the leak-proof water supply valve.

[0037] Figure 3 It is a cross-sectional view of the bottom surface of the leak-proof water supply valve.

[0038] Figure 4 A partial cross-sectional view of a leak-proof water supply valve. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0040] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] Embodiment 1:

[0042] like Figures 1 to 4 The leak-proof water-replenishing valve of a closed circulation system shown in the figure comprises a valve body 1, a valve core assembly 2, a pressure sensor 3, a one-way valve assembly 4, a flow sensor 5 and a controller 6. The closed circulation system refers to a medium in a closed circulation loop during operation. The closed circulation system suitable for the leak-proof water-replenishing valve includes a cold (heat) agent system in an air-conditioning system. In the leak-proof water-replenishing valve, a fluid medium inlet 11 and a fluid medium outlet 12 are provided on the valve body 1, and a medium channel 13 is formed between the fluid medium inlet 11 and the fluid medium outlet 12; connecting threads are usually arranged on the side walls of the pipe orifices of the fluid medium inlet 11 and the fluid medium outlet 12 to facilitate pipeline connection. After the leak-proof water-replenishing valve is connected to the waterway, the closed circulation system is downstream of the fluid medium outlet 12, and the external supply system is upstream of the fluid medium inlet 11. A filter screen 14 is provided on the fluid medium inlet 11 of the valve body 1 to prevent foreign matter from entering the closed circulation system.

[0043] The valve core assembly 2 is placed in the valve body 1, and controls the flow and disconnection of the medium channel 13. In one embodiment, the valve core assembly 2 includes a spherical valve core, a drive rod, and a reducer connected to the drive rod, a drive motor, a control panel, and sealing rings on both sides of the spherical valve core. The spherical valve core can rotate 360°, and the ball valve can control the flow and disconnection of the medium when it rotates to different positions. In other embodiments, the valve core assembly 2 can also be set as a solenoid valve structure, a gate valve structure, a three-way ball valve structure, etc.; such as the valve core assembly includes a diaphragm core, a valve stem connected to the diaphragm core, and a coil, spring and magnet that drive the valve stem and the diaphragm core.

[0044] The pressure sensor 3 is placed on the medium channel 13 downstream of the valve core assembly 2, and is used to detect fluid pressure parameters, which can characterize the medium pressure in the closed circulation system. Specifically, under a constant working state, the characteristics of the medium can be characterized by the medium pressure. In this technical solution, the fluid pressure parameter detected by the pressure sensor is the fluid pressure; when the fluid pressure is at a normal pressure value, it means that the closed circulation system is in a normal working state; and when the fluid pressure value decreases rapidly, it means that the closed circulation system may be in a leaking state; and when the fluid pressure value drops slightly frequently and multiple times, it means that the closed circulation system may be in a micro-leakage state; further combined with the action of the valve core assembly, it can be determined whether the system is actually leaking.

[0045] The one-way valve assembly 4 is placed in the medium channel 13 downstream of the valve core assembly 2, and automatically adjusts its opening angle according to the medium pressure upstream and downstream thereof. The one-way valve assembly 4 includes a one-way valve disc 41 and a torsion spring 42, and a one-way valve port 15 is arranged inside the valve body 1; one end of the one-way valve disc 41 is hinged on one side of the one-way valve port 15, and the torsion spring 42 is arranged on the hinged end of the one-way valve disc 41; the force of the torsion spring 42 on the one-way valve disc 41 drives the one-way valve disc 41 to close the one-way valve port 15. In the above technical solution, the one-way valve disc 41 is driven by the torsion spring 42, but the elasticity of the torsion spring 42 is relatively small, so under the condition of the fluid pressure difference of the one-way valve port 15, the fluid will act on the one-way valve disc 41, thereby automatically adjusting the opening; when the fluid pressure downstream of the one-way valve port 15 is less than or equal to the fluid pressure upstream of the one-way valve port 15, the one-way valve disc 41 is driven by the power of the fluid to rotate and open. When the fluid pressure downstream of the one-way valve port 15 is greater than or equal to the fluid pressure upstream of the one-way valve port 15, the fluid reverse pressure and the elastic force of the torsion spring 42 will drive the one-way valve plate 41 to close the one-way valve port 15, thereby preventing the fluid from flowing back and limiting the medium to flow in one direction only.

[0046] In addition, the maximum opening angle of the one-way valve plate 41 is 75°, and the pressure point 31 of the sensor 3 is within the opening inner diameter of the one-way valve plate 41; in this scheme, when the one-way valve plate 41 is in a closed state, the pressure point of the sensor is in the closed circulation system, and the fluid medium pressure in the closed circulation system can be monitored; and when the one-way valve plate 41 is in an open state, the pressure point of the sensor 3 is in the guiding area of ​​the one-way valve plate 41 for the medium, and the performance parameters of the fluid medium can be monitored in real time.

[0047] The flow sensor 5 is placed in the medium channel 13 downstream of the valve core assembly 2, and is used to detect the flow rate of the fluid, the fluid velocity of the replenished medium, and the cumulative mass parameter. The flow sensor 5 is realized for its detection function, and there is no need to limit its setting position; it can be arranged at the front end of the valve core assembly or at the rear end of the valve core assembly. However, in a preferred embodiment, the flow sensor includes an impeller 51, and a flow chamber 16 is provided inside the valve body 1 downstream of the one-way valve port 15. The impeller 51 is rotatably arranged in the flow chamber, and the wheel center of the impeller 51 is eccentrically arranged with the center line of the medium channel 13; the one-way valve disc 41 guides the fluid obliquely to the outer edge of the blade of the impeller 51 in the open state. In this technical solution, the one-way valve disc 41 has a guiding effect on the fluid in the open state, so that the fluid is focused on one side of the medium channel 13, and at the same time guides it to flow to the outer edge of the blade of the impeller 51, thereby increasing the power to drive the impeller 51 to rotate. The impeller assembly is equipped with electronic components 52. The rotation of the impeller causes the electrical signal of the component to change. The signal is output to the single-chip CPU and is used as the measured value of the flow sensor for control after data processing. In addition, the flow sensor can be a flow metering detection method in the form of an impeller, and of course, it can also be a flow metering detection method such as a turbine, vortex street, and ultrasonic wave.

[0048] The controller 6 compares the feedback data of the sensor 3 and the sensor 5 with the preset data of the system, and controls the action of the valve core assembly 2 based on the comparison result. It includes a control circuit board with a single-chip microcomputer, which is mainly composed of five parts: a power supply part, a signal acquisition input part, a central data processing part, a display operation part, and an output execution part.

[0049] Based on the above implementation, the purpose is to design the pressure measurement, flow measurement, and fluid flow control of the closed circulation system in a trinity. On the one hand, the pressure sensor 3 in the leak-proof water supply valve is used to monitor the medium pressure in the closed circulation system, and the flow sensor 5 is used to monitor the total amount of medium supplemented in the closed circulation system, and the controller 6 automatically controls the action of the valve core component 2 according to the monitoring result. When the medium pressure of the closed circulation system is detected to be reduced, the valve core component 2 is opened to supplement the medium (such as water, gas, oil or other fluid medium) from the outside to the closed circulation system; when the amount of supplemented medium exceeds the preset value, the combined action of the valve core component 2 and the pressure sensor 3 is started, and it can be clearly determined that the system is in a state of large leakage, medium leakage, slight leakage, etc. or is still in a normal state. Thereby achieving the purpose of automatically supplementing the medium and distinguishing the leakage. On the other hand, the leak-proof water supply valve is provided with a movable one-way valve plate 41. When the fluid power is very small, its opening is appropriately reduced to increase the fluid power, overcome the turbulent state, make the pressure measurement and flow measurement of the fluid more accurate, and at the same time expand its small flow measurement range or lower limit range value. When the fluid power is large, the valve plate will automatically increase its opening to reduce its resistance. For the fluid of the same pipe diameter, the maximum range or upper limit range value can be expanded. When the fluid flows in the reverse direction, the valve body 1 will be closed under the action of the fluid power and spring force to prevent the fluid from flowing back and play the function of one-way flow.

[0050] Embodiment 2:

[0051] This embodiment relates to a closed circulation system leak-proof water replenishment detection method, which uses the leak-proof water replenishment valve described in Example 1; and adopts the following comparison method:

[0052] 3) Compare the fluid pressure parameter detected by the pressure sensor 3 with the fluid pressure parameter of the closed circulation system under normal conditions,

[0053] 4) When the fluid pressure parameter is higher than the normal value, the controller 6 drives the valve core assembly 2 to close.

[0054] 3) When the fluid pressure parameter is lower than the normal value, the controller 6 drives the valve core assembly 2 to add medium from the outside; if the fluid pressure parameter is restored, the added medium is considered normal. If too much medium is added or the value of the sensor 3 does not return to normal, the controller 6 drives the valve core assembly 2 to operate and monitor the measured value of the sensor 3. If it continues to be an abnormal value, it is determined to be a leak.

[0055] 4) When there is a leakage, the controller 6 distinguishes between a large leakage, a small leakage, etc. according to the data of the flow sensor 5.

[0056] 5) When there is a leakage, the controller 6 starts the valve core assembly 2 to operate, gives a fault contact signal and triggers an alarm.

[0057] 6) When a small leak occurs in the system and the controller sounds an alarm, but the user cannot find the leak point after verification and confirms that the leak has not caused intolerable losses, the user can press the "fault tolerance button" and the intelligent leak-proof water supply valve will ignore the small leak and allow the system to work normally.

[0058] Embodiment 3:

[0059] This embodiment relates to a closed circulation system leak-proof water replenishment detection method, which uses the leak-proof water replenishment valve described in Example 1; and adopts the following comparison method:

[0060] 1) The controller 6 drives the valve core assembly 2 to operate, so that the system is always in a state of preparing to add medium; if the amount of medium added is within the control value, it is considered normal.

[0061] 2) If too much medium is added, the controller 6 drives the valve core assembly 2 to operate, and monitors the measured value of the sensor 3, and compares the fluid pressure parameter detected by the sensor 3 with the fluid pressure parameter of the closed circulation system under normal conditions. If it continues to be at an abnormal value, it is determined to be a leak. If it returns to the normal value range, it is determined that the system is still normal, and the action of 1) is continued.

[0062] 3) When there is a leakage, the controller 6 distinguishes between a large leakage, a small leakage, etc. according to the data of the flow sensor 5.

[0063] 4) When there is a leakage, the controller 6 starts the valve core assembly 2 to operate, gives a fault contact signal and triggers an alarm.

[0064] 5) When a small leak occurs in the system and the controller sounds an alarm, but the user cannot find the leak point after verification and confirms that the leak has not caused intolerable losses, the user can press the "fault tolerance button" and the intelligent leak-proof water supply valve will ignore the small leak and allow the system to work normally.

[0065] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for detecting leakage and water replenishment of a closed circulation system, characterized in that: It adopts the following leak-proof water supply valve, including The valve body is provided with a fluid medium inlet and a fluid medium outlet, and a medium channel is formed between the fluid medium inlet and the fluid medium outlet; The valve core assembly is placed in the valve body and controls the flow and disconnection of the medium channel; A pressure sensor is placed in the medium channel downstream of the valve core assembly and is used to detect fluid pressure parameters; A flow sensor is placed in the medium channel and is used to detect the flow parameters of the fluid; The controller compares the feedback data from the sensor with the preset data of the system, and controls the action of the valve core assembly based on the comparison result and logical reasoning; The anti-leakage water supply valve adopts the following comparison method: 1) Compare the fluid pressure parameters detected by the pressure sensor with the fluid pressure parameters of the closed circulation system under normal conditions; 2) When the fluid pressure parameter is higher than the normal value, the controller drives the valve core assembly to close; 3) When the fluid pressure parameter is lower than the normal value, the controller drives the valve core assembly to replenish the medium from the outside; if the fluid pressure parameter is restored, the replenishment of the medium is considered normal; If too much medium is added or the sensor value does not return to normal, the controller drives the valve core assembly to operate and monitor the measured value of the pressure sensor. If it remains at an abnormal value, it is determined to be a leak; 4) When there is a leak, the controller distinguishes between large and small leaks based on the data from the flow sensor; 5) When there is a leakage, the controller starts the valve core assembly, gives a fault contact signal and triggers an alarm; 6) When a small leak occurs in the system and the controller sounds an alarm, but the user cannot find the leak point after verification and confirms that the leak has not caused intolerable losses, press the "fault tolerance button" and the leak-proof water supply valve will ignore the small leak and allow the system to work normally.

2. A closed circulation system leak-proof water replenishment detection method according to claim 1, characterized in that: The flow sensor detects the fluid velocity and cumulative mass parameters of the medium added into the closed circulation system.

3. A closed circulation system leak prevention and water replenishment detection method according to claim 1 or 2, characterized in that: It also includes a one-way valve assembly, which is placed in the medium channel downstream of the valve core assembly and automatically adjusts its opening angle according to the medium pressure upstream and downstream thereof.

4. A closed circulation system leak prevention and water replenishment detection method according to claim 3, characterized in that: The one-way valve assembly includes a one-way valve plate and a torsion spring, and a one-way valve port is arranged inside the valve body; one end of the one-way valve plate is hinged to one side of the one-way valve port, and the torsion spring is arranged on the hinged end of the one-way valve plate; the force of the torsion spring on the one-way valve plate drives the one-way valve plate to close the one-way valve port.

5. A closed circulation system leak prevention and water replenishment detection method according to claim 4, characterized in that: The maximum opening angle of the one-way valve is 75°.

6. A closed circulation system leak prevention and water replenishment detection method according to claim 4, characterized in that: The flow sensor includes an impeller, and a flow cavity is provided at the impeller inside the valve body, the impeller rotating shaft is arranged in the flow cavity, and the wheel center of the impeller is eccentrically arranged with respect to the center line of the medium channel; when the one-way valve plate is in the open state, the fluid is obliquely guided to the outer edge of the impeller blade.

7. The method for detecting leakage and replenishing water in a closed circulation system according to claim 1, characterized in that: The pressure point of the pressure sensor is arranged in the non-turbulent area on the downstream side of the valve core component and the one-way valve.

8. A closed circulation system leak prevention and water replenishment detection method according to claim 7, characterized in that: The pressure point of the pressure sensor is located within the opening path of the one-way valve plate.

9. The method for detecting leakage prevention and water replenishment of a closed circulation system according to claim 1, characterized in that: The valve core assembly comprises a spherical valve core, a valve stem connected to the spherical valve core, and a motor and a reducer for driving the valve stem and the spherical valve core.

10. The method for detecting leakage prevention and water replenishment of a closed circulation system according to claim 1, characterized in that: The valve core assembly comprises a diaphragm core, a valve stem connected to the diaphragm core, and a coil, a spring and a magnet for driving the valve stem and the diaphragm core.

11. A method for detecting leakage and water replenishment of a closed circulation system, characterized in that: It adopts the following leak-proof water supply valve, including The valve body is provided with a fluid medium inlet and a fluid medium outlet, and a medium channel is formed between the fluid medium inlet and the fluid medium outlet; The valve core assembly is placed in the valve body and controls the flow and disconnection of the medium channel; A pressure sensor is placed in the medium channel downstream of the valve core assembly and is used to detect fluid pressure parameters; A flow sensor is placed in the medium channel and is used to detect the flow parameters of the fluid; The controller compares the feedback data from the sensor with the preset data of the system, and controls the action of the valve core assembly based on the comparison result and logical reasoning; The anti-leakage water supply valve adopts the following comparison method: 1) The controller drives the valve core assembly to operate, so that the system is always in a state of preparing to add medium. If the measured value of the pressure sensor drops out of the normal value during this period, it is considered to be a leak; if the amount of medium added is within the control value, it is considered normal; 2) If too much medium is added, the controller drives the valve core assembly to operate and monitors the measured value of the pressure sensor. The fluid pressure parameter detected by the pressure sensor is compared with the fluid pressure parameter of the closed circulation system under normal conditions. If it is lower than the normal value, it is judged as a leak; if it is still within the normal value range, it is judged that the system is normal and the action of 1) is continued; 3) When there is a leak, the controller distinguishes between large and small leaks based on the data from the flow sensor; 4) When there is a leakage, the controller starts the valve core assembly, gives a fault contact signal and triggers an alarm; 5) When a small leak occurs in the system and the controller sounds an alarm, but the user cannot find the leak point after verification and confirms that the leak has not caused intolerable losses, press the "fault tolerance button" and the leak-proof water supply valve will ignore the small leak and allow the system to work normally.

12. A closed circulation system leak prevention and water replenishment detection method according to claim 11, characterized in that: The flow sensor detects the fluid velocity and cumulative mass parameters of the medium added into the closed circulation system.

13. A closed circulation system leak prevention and water replenishment detection method according to claim 11 or 12, characterized in that: It also includes a one-way valve assembly, which is placed in the medium channel downstream of the valve core assembly and automatically adjusts its opening angle according to the medium pressure upstream and downstream thereof.

14. A closed circulation system leak prevention and water replenishment detection method according to claim 13, characterized in that: The one-way valve assembly includes a one-way valve plate and a torsion spring, and a one-way valve port is arranged inside the valve body; one end of the one-way valve plate is hinged to one side of the one-way valve port, and the torsion spring is arranged on the hinged end of the one-way valve plate; the force of the torsion spring on the one-way valve plate drives the one-way valve plate to close the one-way valve port.

15. A closed circulation system leak prevention and water replenishment detection method according to claim 14, characterized in that: The maximum opening angle of the one-way valve is 75°.

16. A closed circulation system leak prevention and water replenishment detection method according to claim 14, characterized in that: The flow sensor includes an impeller, and a flow cavity is provided at the impeller inside the valve body, the impeller rotating shaft is arranged in the flow cavity, and the wheel center of the impeller is eccentrically arranged with respect to the center line of the medium channel; when the one-way valve plate is in the open state, the fluid is obliquely guided to the outer edge of the impeller blade.

17. A closed circulation system leak prevention and water replenishment detection method according to claim 11, characterized in that: The pressure point of the pressure sensor is arranged in the non-turbulent area on the downstream side of the valve core component and the one-way valve.

18. A closed circulation system leak prevention and water replenishment detection method according to claim 17, characterized in that: The pressure point of the pressure sensor is located within the opening path of the one-way valve plate.

19. The closed circulation system leak prevention and water replenishment detection method according to claim 11, characterized in that: The valve core assembly comprises a spherical valve core, a valve stem connected to the spherical valve core, and a motor and a reducer for driving the valve stem and the spherical valve core.

20. The closed circulation system leak prevention and water replenishment detection method according to claim 11, characterized in that: The valve core assembly comprises a diaphragm core, a valve stem connected to the diaphragm core, and a coil, a spring and a magnet for driving the valve stem and the diaphragm core.

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