A foam mixing stop valve for a wireless control supported fire fighting system

Abstract

This invention relates to the field of fire protection equipment technology, and in particular to a foam mixing shut-off valve for a fire protection system that supports wireless control. The valve includes a valve body with an inlet hole at the bottom. A wireless receiver is fixedly mounted on the valve body. An inlet pipe is fixedly connected to the bottom of the valve body and communicates with the inlet hole. A drain pipe is fixedly connected to the side of the valve body. An installation ring is fixedly connected inside the inlet pipe, and a flow control valve plate is rotatably connected inside the installation ring. This invention, through the periodic activation of the controller and the combined action of a first mode and a second mode, causes the foam concentrate to circulate in a loop. During the flow, sedimentation is reduced and viscosity information is detected. The opening of the flow control valve plate is controlled based on the viscosity information to ensure that the flow rate of the foam concentrate remains constant during the supply process, thereby eliminating initial supply deviations and mixing ratio inaccuracies caused by temperature changes and sediment stratification.

Description

Technical Field

[0001] This invention relates to the field of fire protection equipment technology, and in particular to a foam mixing shut-off valve for a fire protection system that supports wireless control. Background Technology

[0002] Firefighting foam extinguishing systems are core equipment for extinguishing liquid fires. Their working principle is to pump the base liquid and foam concentrate into the mixer through the corresponding delivery pump for thorough mixing. The foaming device then generates foam to cover the surface of the burning material, thereby suffocating the fire.

[0003] Patent document CN120848163B discloses an ultra-precision flow control shut-off valve system, comprising: a digital hydraulic valve assembly for controlling fluid flow; a flow sensor module; a differential pressure sensor module; a temperature sensor module; a digital signal processor; a control execution unit; and a parameter interaction and fusion mechanism. The digital signal processor achieves dynamic coordination and optimization of parameters between algorithms through a set of parameter interaction equations. The parameter interaction and fusion mechanism includes a basic parameter interaction layer, a dynamic parameter interaction layer, a compensation parameter interaction layer, and a global optimization parameter interaction layer.

[0004] In existing technologies, the base liquid and foam concentrate used to mix fire-fighting foam liquid are pumped into the mixer by corresponding pumps. Protein foam liquid, as a type of foam concentrate, has significant temperature sensitivity and an inherent tendency to precipitate and stratify. The viscosity of protein foam liquid can increase several times at low temperatures, while it decreases significantly at high temperatures. As a result, under the same pumping pressure and valve opening, the supply flow rate of foam concentrate varies greatly depending on the temperature of different seasons, making the mixing ratio control of fire-fighting foam liquid extremely unstable. Furthermore, under long-term static conditions, protein foam liquid is prone to precipitation and stratification, resulting in a lower concentration of foam concentrate flowing out in the initial stage of fire system activation, which affects the fire extinguishing effect of fire-fighting foam liquid. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a foam mixing shut-off valve for fire protection systems that supports wireless control.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a foam mixing shut-off valve for a fire protection system that supports wireless control, comprising a valve body, an inlet hole at the bottom of the valve body, a shut-off component for sealing the inlet hole inside the valve body, and a wireless receiver fixedly installed on the valve body. The wireless receiver is used to receive external wireless control signals and control the shut-off component to operate according to the signals. A liquid inlet pipe is fixedly connected to the bottom of the valve body, and the liquid inlet pipe is connected to the liquid inlet hole. A liquid outlet pipe is fixedly connected to the side of the valve body. An installation ring is fixedly connected inside the liquid inlet pipe. A flow control valve plate is rotatably connected inside the installation ring. A swing hydraulic cylinder is fixedly installed on the installation ring. The output shaft of the swing hydraulic cylinder is fixedly connected to the flow control valve plate. The inlet pipe is equipped with a circulation system, which includes: The circulation pipeline is fixedly connected to the inlet pipe; A circulating pump is installed on the circulating pipeline; A viscosity monitoring component is installed on the inlet pipe; The controller is located on the inlet pipe; The controller is configured to execute: In the first mode, the flow control valve plate is closed and the circulation pump is started, and the real-time viscosity information of the foam concentrate inside the inlet pipe is obtained through the viscosity monitoring component. In the second mode, based on the viscosity information obtained in the first mode, the opening of the flow control valve plate is adjusted to regulate the flow rate of the foam concentrate entering the valve body.

[0007] Preferably, the viscosity monitoring component includes two viscosity sensors, both of which are fixedly inserted into the wall of the inlet pipe, and the monitoring probes of the two viscosity sensors are located in the top and bottom regions inside the inlet pipe, respectively.

[0008] Preferably, the control logic of the viscosity sensor and controller is as follows: During the operation of the circulating pump, two viscosity sensors monitor the high viscosity signal and the low viscosity signal respectively and send them to the controller in real time. After receiving the high viscosity signal and the low viscosity signal, the controller compares the two: When the difference between the high viscosity signal and the low viscosity signal is within the preset allowable deviation range, the controller determines that the foam concentrate in the inlet pipe has a uniform composition and no sedimentation or stratification. When the value of the low viscosity signal is greater than the value of the high viscosity signal, and the difference between the two exceeds the preset allowable deviation range, the controller determines that there is sedimentation and stratification in the foam concentrate in the inlet pipe. During the operation of the circulation pump, the difference gradually decreases and stabilizes within the preset allowable deviation range and remains there for a preset time. Then, the controller determines that the sedimentation and stratification of the foam concentrate has been completely eliminated and the liquid has returned to a uniform state.

[0009] Preferably, the controller is also configured with the following exception detection logic: When the high viscosity signal or low viscosity signal received by the controller is continuously zero or exceeds the reasonable value range, the controller determines that the corresponding viscosity sensor has malfunctioned and generates a sensor fault signal. If the controller continuously receives a high viscosity signal and a low viscosity signal within a preset time period, and the difference exceeds the allowable deviation range and cannot be reduced to the allowable range, the controller determines that the foam concentrate has an unremovable sediment or has deteriorated, and generates a viscosity abnormality signal.

[0010] Preferably, multiple spiral mixing plates are fixedly connected inside the circulation pipeline. The multiple spiral mixing plates are arranged sequentially along the axial direction of the circulation pipeline, and two adjacent spiral mixing plates are in contact with each other. The spiral directions of two adjacent spiral mixing plates are perpendicular to each other.

[0011] Preferably, the inlet pipe has two rotating rings inside, and multiple inclined blades are fixedly connected between the two rotating rings along the circumference. The multiple inclined blades slide against the inner wall of the inlet pipe and are inclined in the same direction.

[0012] Preferably, the shut-off assembly includes a valve cover fixed to the top of the valve body. A valve stem is threaded onto the axial center of the valve cover. A plunger that slides against the inner wall of the valve body is fixed to the lower end of the valve stem. The bottom end of the plunger is in sealing contact with the inlet hole. A mating gear is fixedly connected to the valve stem. A drive motor is fixedly mounted on the valve cover. A drive gear is fixedly connected to the output shaft of the drive motor. The drive gear meshes with the mating gear. The axial thickness of the drive gear is greater than the axial thickness of the mating gear, so that the mating gear always remains meshed with the drive gear during the lifting and lowering of the valve stem.

[0013] Preferably, a handwheel is fixedly connected to the top of the valve stem.

[0014] Preferably, the drive motor is a stepper motor without a brake device, and its output shaft can rotate freely when the power is off.

[0015] Preferably, a flange is fixedly connected to one end of both the inlet pipe and the outlet pipe.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. Through the periodic activation of the controller, and with the combined action of the first and second modes, the foam concentrate is circulated in a loop. During the flow, sedimentation is reduced and viscosity information is detected. Based on the viscosity information, the opening of the flow control valve is controlled to ensure that the flow rate of the foam concentrate remains constant during the supply process. Moreover, the output is stable at the preset concentration at the first moment of fire extinguishing activation, thereby eliminating the initial supply deviation and mixing ratio inaccuracy caused by temperature changes and sedimentation stratification.

[0017] 2. The foam concentrate is guided by multiple spiral mixing plates. When it flows through two adjacent spiral mixing plates, it generates alternating eddies, which fully mixes the foam concentrate with the carried sediment. This ensures that the sediment is evenly dispersed in the liquid and is less likely to settle again during subsequent transportation, thus ensuring the stability of the foam concentrate composition during the supply process.

[0018] 3. When the foam concentrate circulates in the annular loop, it flows through multiple inclined blades. Driven by the liquid flow, the inclined blades drive the two rotating rings to rotate in one direction, which lifts and agitates the stratified sediment inside the inlet pipe, so that the sediment is resuspended in the foam concentrate and flows with the foam concentrate, which facilitates the mixing of the foam concentrate and the stratified sediment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a partial structural cross-sectional schematic diagram of the present invention (the valve body, inlet pipe, outlet pipe, circulation pipeline, and valve cover are cut out). Figure 3 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A in the diagram; Figure 4 For the present invention Figure 2 Enlarged schematic diagram of the structure at point B in the diagram; Figure 5 For the present invention Figure 2 A magnified schematic diagram of the structure at point C.

[0020] In the diagram: 1. Valve body; 2. Inlet port; 3. Wireless receiver; 4. Inlet pipe; 5. Drain pipe; 6. Mounting ring; 7. Flow control valve plate; 8. Swing hydraulic cylinder; 9. Circulation pipeline; 10. Circulation pump; 11. Viscosity sensor; 12. Spiral mixing blade; 13. Rotating ring; 14. Inclined blade; 15. Valve cover; 16. Valve stem; 17. Plunger; 18. Matching gear; 19. Drive motor; 20. Drive gear; 21. Handwheel; 22. Flange. Detailed Implementation

[0021] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0022] like Figures 1 to 5The foam mixing shut-off valve for a fire protection system that supports wireless control is shown. It includes a valve body 1, an inlet hole 2 at the bottom of the valve body 1, a shut-off component that seals the inlet hole 2 inside the valve body 1, and a wireless receiver 3 fixedly installed on the valve body 1. The wireless receiver 3 is used to receive external wireless control signals and control the shut-off component to operate according to the signals. A liquid inlet pipe 4 is fixedly connected to the bottom of the valve body 1, and the liquid inlet pipe 4 is connected to the liquid inlet hole 2. A drain pipe 5 is fixedly connected to the side of the valve body 1. A mounting ring 6 is fixedly connected inside the liquid inlet pipe 4, and a flow control valve plate 7 (e.g., Figure 3 As shown), a swing hydraulic cylinder 8 is fixedly installed on the mounting ring 6, and the output shaft of the swing hydraulic cylinder 8 is fixedly connected to the flow control valve plate 7; The inlet pipe 4 is equipped with a circulation system, which includes: The circulation pipe 9 is fixedly connected to the liquid inlet pipe 4; Circulation pump 10 is installed on circulation pipeline 9; A viscosity monitoring component is installed on the inlet pipe 4; The controller is located on the inlet pipe 4; The controller is configured to execute: In the first mode, the flow control valve plate 7 is closed and the circulation pump 10 is started, and the real-time viscosity information of the foam concentrate inside the inlet pipe 4 is obtained through the viscosity monitoring component. In the second mode, based on the viscosity information obtained in the first mode, the opening of the flow control valve plate 7 is adjusted to regulate the flow rate of the foam concentrate entering the valve body 1. The inlet pipe 4 is fixedly connected to the storage tank containing the foam concentrate, while the outlet pipe 5 is fixedly connected to the mixer. The inlet hole 2 is sealed by a shut-off assembly, thus sealing and blocking both ends of the valve body 1. When the controller starts, it executes the first mode. In the first mode, the controller sends a closing command to the swing hydraulic cylinder 8, driving its output shaft to rotate and close the flow control valve plate 7. This forms a closed loop with the circulation pump 10, circulation pipe 9, and inlet pipe 4, simultaneously cutting off the passage between the inlet pipe 4 and the storage tank. This closed loop reduces the driving range of the circulation pump 10, thereby reducing its energy consumption. After the flow control valve plate 7 closes, the controller sends a running command to the circulation pump 10. The circulation pump 10 runs and drives the foam concentrate inside the circulation pipe 9 and inlet pipe 4 to circulate in the loop, thus concentrating the foam concentrate. During the flow of the liquid, the viscosity monitoring component acquires real-time viscosity information of the foam concentrate. The viscosity monitoring component sends the acquired viscosity information to the controller. The controller acquires the viscosity information and sends a shutdown command to the circulation pump 10. After the circulation pump 10 stops running, the second mode is executed. In the second mode, the controller sends a corresponding opening command to the swing hydraulic cylinder 8 according to the acquired specific viscosity information, causing the output shaft of the swing hydraulic cylinder 8 to drive the flow control valve plate 7 to rotate to the corresponding angle, thereby adjusting the opening of the flow control valve plate 7 according to the viscosity information. As the viscosity of the foam concentrate increases, the opening of the flow control valve plate 7 increases accordingly. The controller uses a proportional control algorithm, with the preset theoretical constant flow rate in the inlet pipe 4 as the target value, and dynamically outputs the drive current according to the real-time viscosity change to adjust the opening of the flow control valve plate 7. The controller is in standby mode under normal conditions and starts at preset time intervals to perform periodic viscosity self-checks on the foam concentrate inside the inlet pipe 4. In the event of a fire, firefighters send a wireless control signal to the wireless receiver 3 through the wireless control terminal. After receiving the wireless control signal, the wireless receiver 3 controls the cut-off component to operate and releases the sealing barrier at both ends of the valve body 1. The foam concentrate inside the storage tank enters the valve body 1 through the pump pressure along the inlet pipe 4 and continues to enter the mixer along the drain pipe 5 to fully mix with the base liquid. By periodically starting the controller and coordinating the first and second modes, the foam concentrate circulates in a loop. During the flow, sedimentation is reduced and viscosity information is detected. The opening of the flow control valve 7 is controlled based on the viscosity information to ensure that the flow rate of the foam concentrate remains constant during the supply process. Furthermore, the concentrate is stably output at the preset concentration at the first moment of fire extinguishing activation, thereby eliminating the initial supply deviation and mixing ratio inaccuracy caused by temperature changes and sedimentation stratification.

[0023] As a further embodiment of the present invention, the viscosity monitoring component includes two viscosity sensors 11, both of which are fixedly inserted into the wall of the inlet pipe 4 (e.g., Figure 4As shown), the monitoring probes of the two viscosity sensors 11 are located in the top and bottom regions inside the inlet pipe 4, respectively. When the foam concentrate circulates in a closed loop formed by the circulating pump 10, the circulating pipeline 9 and the inlet pipe 4, two viscosity sensors 11 simultaneously monitor the viscosity of the flowing foam concentrate. When the foam concentrate is left to stand for a long time and produces stratified sedimentation, the sediment settles at the bottom of the inlet pipe 4, causing the viscosity of the foam concentrate in the bottom area to increase, while the viscosity in the top area is relatively low. At this time, the viscosity value monitored by the viscosity sensor 11 in the bottom area is greater than the viscosity value monitored by the viscosity sensor 11 in the top area. As the circulating pump 10 continues to run, the foam concentrate circulates continuously in the annular loop, and the bottom sediment is gradually rolled up and resuspended in the liquid, making the composition of the foam concentrate in the upper and lower regions more uniform. During this process, the viscosity difference monitored by the two viscosity sensors 11 gradually decreases. When the viscosity difference monitored by the two viscosity sensors 11 is within the preset allowable deviation range, and this state continues for a preset time, it indicates that the sedimentation and stratification of the foam concentrate inside the liquid inlet pipe 4 has been basically eliminated, and the liquid has returned to a uniform state. At this time, the viscosity value monitored is the current true viscosity of the foam concentrate.

[0024] As a further embodiment of the present invention, the control logic of the viscosity sensor 11 and the controller is as follows: During the operation of the circulating pump 10, two viscosity sensors 11 monitor the high viscosity signal and the low viscosity signal respectively and send them to the controller in real time. After receiving the high viscosity signal and the low viscosity signal, the controller compares the two: When the difference between the high viscosity signal and the low viscosity signal is within the preset allowable deviation range, the controller determines that the foam concentrate in the inlet pipe 4 has a uniform composition and no sedimentation or stratification. When the value of the low viscosity signal is greater than the value of the high viscosity signal, and the difference between the two exceeds the preset allowable deviation range, the controller determines that there is sedimentation and stratification in the foam concentrate in the inlet pipe 4. During the operation of the circulation pump 10, the difference gradually decreases and stabilizes within the preset allowable deviation range and remains at the preset duration. Then, the controller determines that the sedimentation and stratification of the foam concentrate has been completely eliminated and the liquid has returned to a uniform state.

[0025] As a further embodiment of the present invention, the controller is also configured with the following exception judgment logic: When the high viscosity signal or low viscosity signal received by the controller is continuously zero or exceeds the reasonable value range, the controller determines that the corresponding viscosity sensor 11 has malfunctioned and generates a sensor fault signal. If the controller continuously receives a high viscosity signal and a low viscosity signal within a preset time period, and the difference exceeds the allowable deviation range and cannot be reduced to the allowable range, the controller determines that the foam concentrate has an unremovable sediment or has deteriorated, and generates a viscosity abnormality signal.

[0026] As a further embodiment of the present invention, a plurality of spiral mixing plates 12 are fixedly connected inside the circulation pipeline 9 (e.g., ...). Figure 5 As shown), multiple spiral mixing plates 12 are arranged sequentially along the axial direction of the circulation pipeline 9, and two adjacent spiral mixing plates 12 are in contact with each other, and the spiral directions of two adjacent spiral mixing plates 12 are perpendicular to each other. When the foam concentrate circulates in the annular loop, it flows inside the circulation pipe 9 and is guided by multiple spiral mixing plates 12. When it flows through two adjacent spiral mixing plates 12, it generates alternating eddies, which fully mix the foam concentrate with the carried sediment, so that the sediment is evenly dispersed in the liquid and is not easy to settle again during subsequent transportation, thus ensuring the stability of the foam concentrate composition during the liquid supply process.

[0027] As a further embodiment of the present invention, two rotating rings 13 are rotatably connected inside the liquid inlet pipe 4, and multiple inclined blades 14 are fixedly connected between the two rotating rings 13 along the circumferential direction. The multiple inclined blades 14 are all slidably attached to the inner wall of the liquid inlet pipe 4 and inclined in the same direction. When the foam concentrate circulates in the annular loop, it flows through multiple inclined blades 14. Under the driving force of the liquid flow, the multiple inclined blades 14 drive the two rotating rings 13 to rotate in one direction, which lifts and stirs the stratified sediment inside the liquid inlet pipe 4, so that the sediment is resuspended in the foam concentrate and flows with the foam concentrate, which facilitates the mixing of the foam concentrate and the stratified sediment.

[0028] As a further embodiment of the present invention, the shut-off assembly includes a valve cover 15, which is fixed to the top of the valve body 1. A valve stem 16 is threadedly fitted at the axial center of the valve cover 15. A plunger 17 that slides against the inner wall of the valve body 1 is fixed to the lower end of the valve stem 16. The bottom end of the plunger 17 is in sealing contact with the liquid inlet 2. A mating gear 18 is fixedly connected to the valve stem 16. A drive motor 19 is fixedly mounted on the valve cover 15. A drive gear 20 is fixedly connected to the output shaft of the drive motor 19. The drive gear 20 meshes with the mating gear 18. The axial thickness of the drive gear 20 is greater than the axial thickness of the mating gear 18, so that the mating gear 18 always remains meshed with the drive gear 20 during the lifting and lowering process of the valve stem 16. The wireless receiver 3 is fixedly installed on the valve body 1 and is communicatively connected to the drive motor 19. The wireless receiver 3 is used to receive wireless control signals sent by an external wireless control terminal and to control the start, stop and direction of the drive motor 19 according to the wireless control signals. When the wireless receiver 3 receives the activation signal, it controls the drive motor 19 to start. The output shaft of the drive motor 19 drives the drive gear 20 to rotate. The drive gear 20 drives the mating gear 18 to rotate through meshing transmission. The mating gear 18 drives the valve stem 16 and the plunger 17 to rotate synchronously. Since the valve stem 16 is threadedly engaged with the valve cover 15, the valve stem 16 moves upward relative to the valve cover 15 while rotating, causing the plunger 17 to rise. This causes the bottom end of the plunger 17 to disengage from the liquid inlet hole 2, releasing the seal on the liquid inlet hole 2, thereby opening the liquid passage inside the valve body 1.

[0029] When the wireless receiver 3 receives the shutdown signal, the wireless receiver 3 controls the drive motor 19 to start in reverse, the drive gear 20 drives the mating gear 18 to rotate in reverse, the valve stem 16 and the plunger 17 rotate in reverse and move downward synchronously, so that the bottom end of the plunger 17 re-seals the inlet hole 2, restores the seal on the inlet hole 2, and thus closes the liquid passage inside the valve body 1.

[0030] As a further embodiment of the present invention, a handwheel 21 is fixedly connected to the top of the valve stem 16; A handwheel 21 is fixed to the top of the valve stem 16. When the wireless receiver 3 fails to receive the wireless control signal or the wireless control terminal is powered off, the liquid passage inside the valve body 1 can be opened by manually rotating the handwheel 21 to ensure emergency protection in the event of a failure.

[0031] As a further embodiment of the present invention, the drive motor 19 is a stepper motor without a brake device, and its output shaft can rotate freely when the power is off. By using a stepper motor without a brake device, combined with the threaded self-locking characteristics of the valve stem 16 and the valve cover 15, the position holding capability of the valve body 1 in the working state is guaranteed, and the feasibility of operating the handwheel 21 in the power-off state is realized. There is no need to set up an additional clutch mechanism, which reduces the system complexity and manufacturing cost.

[0032] As a further embodiment of the present invention, a flange 22 is fixedly connected to one end of both the liquid inlet pipe 4 and the liquid outlet pipe 5; By fixing flanges 22 on the inlet pipe 4 and the outlet pipe 5, it is easy to connect the inlet pipe 4 to the storage tank and the outlet pipe 5 to the mixer.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A foam mixing shut-off valve for a fire protection system supporting wireless control, comprising a valve body, an inlet port at the bottom of the valve body, and a shut-off assembly for sealing the inlet port inside the valve body, characterized in that, A wireless receiver is fixedly installed on the valve body. The wireless receiver is used to receive external wireless control signals and control the operation of the cut-off component according to the signals. A liquid inlet pipe is fixedly connected to the bottom of the valve body, and the liquid inlet pipe is connected to the liquid inlet hole. A liquid outlet pipe is fixedly connected to the side of the valve body. An installation ring is fixedly connected inside the liquid inlet pipe. A flow control valve plate is rotatably connected inside the installation ring. A swing hydraulic cylinder is fixedly installed on the installation ring. The output shaft of the swing hydraulic cylinder is fixedly connected to the flow control valve plate. The inlet pipe is equipped with a circulation system, which includes: The circulation pipeline is fixedly connected to the inlet pipe; A circulating pump is installed on the circulating pipeline; A viscosity monitoring component is installed on the inlet pipe; The controller is located on the inlet pipe; The controller is configured to execute: In the first mode, the flow control valve plate is closed and the circulation pump is started, and the real-time viscosity information of the foam concentrate inside the inlet pipe is obtained through the viscosity monitoring component. In the second mode, based on the viscosity information obtained in the first mode, the opening of the flow control valve plate is adjusted to regulate the flow rate of the foam concentrate entering the valve body.

2. A foam mixing shut-off valve for a fire protection system supporting wireless control according to claim 1, characterized in that, The viscosity monitoring component includes two viscosity sensors, both of which are fixedly inserted into the wall of the inlet pipe. The monitoring probes of the two viscosity sensors are located in the top and bottom regions inside the inlet pipe, respectively.

3. A foam mixing shut-off valve for a fire protection system supporting wireless control according to claim 2, characterized in that, The control logic of the viscosity sensor and controller is as follows: During the operation of the circulating pump, two viscosity sensors monitor the high viscosity signal and the low viscosity signal respectively and send them to the controller in real time. After receiving the high viscosity signal and the low viscosity signal, the controller compares the two: When the difference between the high viscosity signal and the low viscosity signal is within the preset allowable deviation range, the controller determines that the foam concentrate in the inlet pipe has a uniform composition and no sedimentation or stratification. When the value of the low viscosity signal is greater than the value of the high viscosity signal, and the difference between the two exceeds the preset allowable deviation range, the controller determines that there is sedimentation and stratification in the foam concentrate in the inlet pipe. During the operation of the circulation pump, the difference gradually decreases and stabilizes within the preset allowable deviation range and remains there for a preset time. Then, the controller determines that the sedimentation and stratification of the foam concentrate has been completely eliminated and the liquid has returned to a uniform state.

4. A foam mixing shut-off valve for a fire protection system supporting wireless control according to claim 3, characterized in that, The controller is also configured with the following exception handling logic: When the high viscosity signal or low viscosity signal received by the controller is continuously zero or exceeds the reasonable value range, the controller determines that the corresponding viscosity sensor has malfunctioned and generates a sensor fault signal. If the controller continuously receives a high viscosity signal and a low viscosity signal within a preset time period, and the difference exceeds the allowable deviation range and cannot be reduced to the allowable range, the controller determines that the foam concentrate has an unremovable sediment or has deteriorated, and generates a viscosity abnormality signal.

5. A foam mixing shut-off valve for a fire protection system supporting wireless control according to claim 1, characterized in that, Multiple spiral mixing plates are fixedly connected inside the circulation pipeline. The multiple spiral mixing plates are arranged sequentially along the axial direction of the circulation pipeline, and two adjacent spiral mixing plates are in contact with each other. The spiral directions of two adjacent spiral mixing plates are perpendicular to each other.

6. A foam mixing shut-off valve for a fire protection system supporting wireless control according to claim 5, characterized in that, The inlet pipe has two rotating rings inside, and multiple inclined blades are fixedly connected between the two rotating rings along the circumference. All the inclined blades slide against the inner wall of the inlet pipe and are inclined in the same direction.

7. A foam mixing shut-off valve for a fire protection system supporting wireless control according to claim 1, characterized in that, The shut-off assembly includes a valve cover fixed to the top of the valve body. A valve stem is threaded onto the axial center of the valve cover. A plunger that slides against the inner wall of the valve body is fixed to the lower end of the valve stem. The bottom end of the plunger is in sealing contact with the inlet hole. A mating gear is fixedly connected to the valve stem. A drive motor is fixedly mounted on the valve cover. A drive gear is fixedly connected to the output shaft of the drive motor. The drive gear meshes with the mating gear. The axial thickness of the drive gear is greater than the axial thickness of the mating gear, so that the mating gear always remains meshed with the drive gear during the raising and lowering of the valve stem.

8. A foam mixing shut-off valve for a fire protection system supporting wireless control according to claim 7, characterized in that, A handwheel is fixedly connected to the top of the valve stem.

9. A foam mixing shut-off valve for a fire protection system supporting wireless control according to claim 8, characterized in that, The drive motor is a stepper motor without a brake device, and its output shaft can rotate freely when the power is off.

10. A foam mixing shut-off valve for a fire protection system supporting wireless control according to claim 1, characterized in that, Both the inlet pipe and the outlet pipe are fixedly connected to a flange at one end.

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