Active control safety overflow valve

Abstract

An active control safety overflow valve is provided with a driving assembly and a pressure sensor, a servo motor is arranged in the driving assembly, and the pressure sensor is used for collecting the pressure of liquid in the overflow valve and controlling the servo motor to act; the servo motor acts to drive the overflow valve to act, and the overflow valve is actively controlled to be opened or closed; the safety overflow valve has the advantages of being accurate in pressure control, capable of achieving self-recovery and high in response speed, the defects of an existing safety overflow valve for shale oil exploitation fracturing are overcome, and the safety and continuity of shale oil exploitation fracturing production are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of equipment for shale oil extraction, in particular to an actively controlled safety overflow valve. Background Technique

[0002] During the fracturing operation of shale oil extraction, the working pressure of the fracturing fluid is as high as 120 MPa. Therefore, a safety overflow valve must be set on the fracturing fluid pipeline to prevent the working pressure of the fracturing fluid from exceeding the set maximum pressure and causing production safety accidents. Therefore, the safety overflow valve is one of the core equipment in the fracturing operation of shale gas extraction.

[0003] There are two structures of the existing safety overflow valves used for shale oil extraction fracturing. One is a pilot-operated safety overflow valve based on spring preloading, and the other is a safety overflow valve based on a safety pin. When the pilot-operated safety overflow valve based on spring preloading is working, once the pressure of the fracturing fluid is higher than the set safety pressure, the pilot-operated safety overflow valve overcomes the spring preloading and automatically overflows and relieves pressure, and it can recover by itself after relieving pressure, without affecting the continuity of shale oil extraction fracturing production. However, when the pilot-operated safety overflow valve based on spring preloading is working, the pressure relief flow rate is small and the pressure relief speed is slow, so the response speed to the pressure exceeding the set value is slow. When the safety overflow valve based on a safety pin is working, when the pressure of the fracturing fluid is higher than the set safety pressure, the safety pin will be cut off for overflow pressure relief. Its pressure relief flow rate is large and the pressure relief speed is fast, so the response speed to the safety pressure is fast. However, once the safety pin is cut off, the safety overflow valve cannot recover by itself, thus affecting the continuity of shale oil extraction fracturing production. In addition, for the safety overflow valve based on a safety pin, due to the deviation of the material properties of the safety pin used or the deviation of the parameters during the heat treatment process, the strength consistency of the safety pin will be different. This difference causes the operating pressure of the overflow valve to deviate from the set safety pressure. When the operating pressure of the overflow valve is higher than the set safety pressure, it is easy to cause pipeline rupture or leakage of other equipment, thus triggering production safety accidents. Due to the above defects of the existing safety overflow valves used for shale oil extraction fracturing, it is necessary to improve them. Content of the Utility Model

[0004] In order to overcome the deficiencies in the background technique, the utility model discloses an actively controlled safety overflow valve, which collects the liquid pressure in the safety overflow valve through a pressure sensor and controls the valve stem to move by driving a servo motor, so as to realize the active control of opening or closing the safety overflow valve.

[0005] To achieve the object of the utility model, the following technical solutions are adopted in the present utility model: An active control safety overflow valve, comprising an overflow valve, a driving assembly, a connecting flange, and a driving sleeve; the overflow valve and the driving assembly are fixedly connected through the connecting flange and are connected by transmission through the driving sleeve; a pressure sensor is fixedly arranged in the overflow valve, and a valve stem is movably arranged; a servo motor is arranged in the driving assembly; the pressure sensor collects the liquid pressure in the overflow valve and controls the operation of the servo motor in the driving assembly, and the driving assembly drives the valve stem to move downward or upward through the driving sleeve to control the overflow amount of the overflow valve; since the pressure sensor is adopted to collect the liquid pressure in the overflow valve, the safety overflow valve has the advantage of accurate pressure control; since the servo motor is adopted to drive the two-way action of the overflow valve, it has the advantages of self-recovery after pressure relief and fast response speed; the safety overflow valve solves many defects of the existing safety overflow valve for shale oil extraction fracturing and ensures the safety and continuity of shale oil extraction fracturing production.

[0006] Further, the overflow valve includes a valve cover, a valve body, a valve seat pressing ring, a valve seat, a valve stem, and a valve core. The valve core is fixedly arranged at the lower end of the valve stem to form a valve stem assembly; a valve body cavity is provided in the valve body, a liquid inlet is provided at the bottom of the valve body cavity, and a liquid outlet is provided on the side wall; the valve seat pressing ring and the valve seat are stacked up and down and are fixedly arranged in the valve body cavity; the valve cover is fixedly arranged at the upper end of the valve body, and the lower end face of the valve cover abuts against the upper end face of the valve seat pressing ring; a valve seat cavity is provided in the valve seat, and the valve core is movably arranged in the valve seat cavity; when the valve stem moves upward, the valve core opens the overflow channel of the overflow valve for overflow pressure relief; when the valve stem moves downward, the valve core closes the overflow channel of the overflow valve.

[0007] Further, the overflow valve further includes a copper nut, and the copper nut is rotatably arranged on the upper part of the valve cover through a thrust bearing; a screw head is provided at the upper end of the valve stem; the screw head is meshed and connected with the copper nut, and when the copper nut rotates, it drives the valve stem to move up or down.

[0008] Further, a valve core hole is provided in the middle of the valve core, the lower end of the valve stem is inserted into the valve core hole and is fixedly connected through a safety pin, and there is a distance between the lower end face of the valve stem and the bottom surface of the valve core hole; the safety pin is a safety guarantee structure of the active control safety overflow valve. When there is a problem with the driving assembly or the overflow valve control system and the valve core cannot be opened normally, the valve core forcibly cuts off the safety pin under the action of ultra-high pressure liquid pressure, so that the overflow valve overflows forcibly, thereby further improving the working safety of the overflow valve.

[0009] Furthermore, a valve stem piston is provided near the lower end of the valve stem, and the valve stem piston is movably arranged in the valve seat cavity to divide the valve seat cavity into an upper and lower cavity; the valve body is provided with a pressure equalizing channel, and the valve seat is provided with a valve seat pressure equalizing hole. The pressure equalizing channel and the valve seat pressure equalizing hole connect the liquid outlet of the valve body with the upper cavity of the valve seat cavity of the valve seat, so that no matter whether the valve core is in an open or closed state, ultra-high pressure liquid enters the upper cavity of the valve seat cavity; when the relief valve is in a closed state, the ultra-high pressure liquid enters the upper cavity of the valve seat cavity, and exerts a downward force on the valve core through the valve stem piston, and this force overcomes the upward force on the upper part of the valve core (the upward force on the valve core is generated by the ultra-high pressure liquid in the lower part of the valve core), thereby improving the sealing effect of the valve core and reducing the leakage of the relief valve; when the relief valve is in an open state, the valve stem is movably arranged in the valve seat cavity to improve the sealing effect of the valve core and reduce the leakage of the relief valve; when the relief valve is in an open state, the valve stem is movably arranged in the valve seat cavity to The downward force exerted by the plug on the valve core partially offsets the upward force on the valve core, and the axial force on the valve stem is reduced. Therefore, the torque of the servo motor driving the valve stem to move up and down is reduced, which can improve the service life of the servo motor; in addition, after the valve stem piston is set on the valve stem, it actually forms a support for the lower end of the valve stem, shortens the length of the cantilever end of the valve stem, reduces the vibration of the valve stem when the ultra-high pressure liquid impacts the valve core, and reduces the possibility of valve stem breakage; during the operation of the relief valve, the ultra-high pressure liquid will never erode the valve stem, thereby increasing the service life of the valve stem; even if the valve stem breaks, high-frequency vibration or howling will occur when the relief valve overflows, but the relief valve can still maintain normal operation for a short time, and the rock gas extraction fracturing operation will not be interrupted.

[0010] Furthermore, a valve seat working surface is provided at the bottom of the valve seat cavity; a valve core working surface is provided at the bottom of the valve core; the valve seat working surface and the valve core working surface are both conical surfaces, and the conical surfaces of the valve seat and the valve core are sealed to reduce leakage of the overflow valve.

[0011] Furthermore, the driving assembly includes a servo motor and a reducer, and the servo motor and the reducer are transmission-connected; the reducer is provided with an output shaft, and the rotation of the servo motor is decelerated by the reducer and then output through the output shaft.

[0012] Furthermore, the reducer is fixedly connected to the upper end surface of the connecting flange, and the valve cover is fixedly connected to the lower end surface of the connecting flange; the drive sleeve is fixedly connected to the output shaft; the copper nut is arranged at the lower end of the drive sleeve and is driven and connected to the copper nut boss through the end groove of the drive sleeve.

[0013] Preferably, the overflow valve includes a valve cover, a valve body, a valve stem, and a valve core, and the valve core is fixedly arranged at the lower end of the valve stem to constitute a valve stem assembly; a valve body cavity is provided in the valve body, a liquid inlet is provided at the bottom of the valve body cavity, and a liquid outlet is provided on the side wall; the valve cover is fixedly arranged at the upper end of the valve body, and the valve core is movably arranged in the valve seat cavity; this type of overflow valve combines the original valve cover and valve seat pressure ring into one, combines the valve body and valve seat into one, combines the valve stem piston and valve core into one, reduces the number of parts of the overflow valve, simplifies the overflow valve structure, and reduces the cost of the overflow valve.

[0014] Due to the adoption of the technical solution described above, the utility model has the following beneficial effects: An actively controlled safety overflow valve disclosed by the utility model is provided with a driving component and a pressure sensor. A servo motor is arranged in the driving component. The liquid pressure in the overflow valve is collected by the pressure sensor to control the action of the servo motor; the action of the servo motor drives the action of the overflow valve to actively control the opening or closing of the overflow valve; this safety overflow valve has the advantages of accurate pressure control, self-recovery, and fast response speed, solves the defects of the existing safety overflow valve for shale oil exploitation fracturing, and ensures the safety and continuity of shale oil exploitation fracturing production. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of an actively controlled safety overflow valve;

[0016] Figure 2 It is a schematic structural diagram of the overflow valve of Embodiment 1;

[0017] Figure 3 It is a schematic cross-sectional structure diagram of the valve body of Embodiment 1;

[0018] Figure 4 It is a schematic cross-sectional structure diagram of the valve seat of Embodiment 1;

[0019] Figure 5 It is a schematic structural diagram of the valve stem;

[0020] Figure 6 It is a schematic cross-sectional structure diagram of the valve core of Embodiment 1;

[0021] Figure 7 It is a schematic external view of the copper nut;

[0022] Figure 8 It is a schematic structural diagram of the driving component;

[0023] Figure 9 It is a schematic external view of the driving sleeve;

[0024] Figure 10 It is a schematic structural diagram of the overflow valve of Embodiment 2;

[0025] Figure 11 It is a schematic cross-sectional structure diagram of the valve body of Embodiment 2;

[0026] Figure 12 It is a schematic structural diagram of the valve stem of Embodiment 2;

[0027] Figure 13 It is a schematic structural diagram of the valve core of Embodiment 2.

[0028] In the figure: 1. Relief valve; 1.1. Valve cover; 1.2. Valve body; 1.2.1. Valve body cavity; 1.2.2. Liquid inlet; 1.2.3. Liquid outlet; 1.2.4. Pressure equalizing channel; 1.2.5. Sensor mounting hole; 1.3. Valve seat pressing ring; 1.4. Valve seat; 1.4.1. Valve seat cavity; 1.4.2. Valve seat working surface; 1.4.3. Valve seat liquid outlet hole; 1.4.4. Valve seat pressure equalizing hole; 1.5. Valve stem; 1.5.1. Screw head; 1.5.2. Valve stem piston; 1.5.3. Valve stem safety pin hole; 1.6. Spool; 1.6.1. Spool hole; 1.6.2. Spool working surface; 1.6.3. Spool safety pin hole; 1.6.4. Spool piston; 1.7. Copper nut; 1.7.1. Copper nut boss; 1.7.2. Bearing positioning ring; 1.8. Safety pin; 1.9. Pressure sensor; 2. Driving assembly; 2.1. Servo motor; 2.2. Reduction gearbox; 2.2.1. Reduction gearbox output shaft; 3. Connecting flange; 4. Driving sleeve; 4.1. Driving sleeve keyway; 4.2. Driving sleeve end groove. Detailed implementation mode

[0029] The present utility model can be explained in detail through the following embodiments, and the purpose of disclosing the present utility model is to protect all technologies and improvements within the scope of the present utility model. Embodiment 1:

[0030] See the attached drawings of the specification Figure 1 : An actively controlled safety relief valve, comprising a relief valve 1, a driving assembly 2, a connecting flange 3, and a driving sleeve 4; the relief valve 1 is fixedly connected to the driving assembly 2 through the connecting flange 3 and is drivingly connected through the driving sleeve 4, and the driving assembly 2 drives the relief valve 1 to act through the driving sleeve 4 to adjust the size of the overflow amount;

[0031] See the attached drawings of the specification Figure 2 : The relief valve 1 includes a valve cover 1.1, a valve body 1.2, a valve seat pressing ring 1.3, a valve seat 1.4, a valve stem 1.5, a spool 1.6, a copper nut 1.7, a safety pin 1.8, and a pressure sensor 1.9; the valve cover 1.1 is a double-disc flange with a stepped hole in the middle, the large-diameter section of the stepped hole is a bearing mounting hole, and a keyway is provided on the side wall of the lower section of the stepped hole;

[0032] See the attached drawings of the specification Figure 3 : The valve body 1.2 is provided with a valve body cavity 1.2.1 in the middle, a liquid inlet 1.2.2 is provided at the bottom of the valve body cavity 1.2.1, a liquid outlet 1.2.3 is provided on the side wall of the valve body cavity 1.2.1, a pressure equalizing channel 1.2.4 is further provided in the side wall of the valve body 1.2, a sensor mounting hole 1.2.5 is provided on the side wall of the liquid inlet 1.2.2, and the pressure equalizing channel 1.2.4 communicates the upper part of the valve body cavity 1.2.1 with the liquid inlet 1.2.2; the pressure sensor 1.9 is fixedly arranged in the sensor mounting hole 1.2.5;

[0033] See the attached description Figure 4 : A valve seat cavity 1.4.1 is provided in the middle of the valve seat 1.4. A conical valve seat working surface 1.4.2 is provided at the bottom of the valve seat cavity 1.4.1. A valve seat liquid outlet hole 1.4.3 and a valve seat pressure equalizing hole 1.4.4 are provided on the side wall of the valve seat cavity 1.4.1;

[0034] See the attached description Figure 5 : A screw head 1.5.1 is provided at the upper end of the valve stem 1.5. A flat key is fixedly arranged on the valve stem 1.5. A valve stem safety pin hole 1.5.3 is provided near the lower end of the valve stem 1.5. A valve stem piston 1.5.2 is provided above the valve stem safety pin hole 1.5.3;

[0035] See the attached description Figure 6 : A valve core hole 1.6.1 is provided in the middle of the valve core 1.6. A valve core safety pin hole 1.6.3 is provided on the side wall of the valve core hole 1.6.1. A conical valve core working surface 1.6.2 is provided near the lower end of the outer cylindrical surface of the valve core 1.6. The lower end of the valve stem 1.5 is inserted into the valve core hole 1.6.1 of the valve core 1.6 and is connected by a safety pin 1.8 to form a valve stem assembly. A gap is provided between the lower end surface of the valve stem 1.5 and the bottom of the valve core hole 1.6.1;

[0036] See the attached description Figure 7 : The inner circle of the copper nut 1.7 is provided with a T-shaped thread. Four copper nut bosses 1.7.1 are evenly distributed on the upper end surface. A bearing positioning ring 1.7.2 is provided near the lower end outer cylindrical surface;

[0037] See the attached description Figure 2 : The valve seat pressing ring 1.3 and the valve seat 1.4 are stacked up and down in the valve body cavity 1.2.1 of the valve body 1.2. The valve seat pressure equalizing hole 1.4.4 is communicated with the pressure equalizing channel 1.2.4. The valve seat liquid outlet hole 1.4.3 corresponds to the liquid outlet 1.2.3; The valve cover 1.1 is arranged at the upper end of the valve body 1.2. The lower flange is fixedly connected to the valve body 1.2. The end surface of the lower flange abuts against the upper end surface of the valve seat pressing ring 1.3; The valve core 1.6 and the valve stem piston 1.5.2 of the valve stem assembly are movably arranged in the valve seat cavity 1.4.1. The screw head 1.5.1 extends into the bearing installation hole of the valve cover 1.1. The flat key on the valve stem 1.5 is slidably arranged in the key groove of the valve cover 1.1; The copper nut 1.7 is threadedly engaged with the screw head 1.5.1. Thrust bearings are provided on the upper and lower end surfaces of the bearing positioning ring 1.7.2; The connecting flange 3 is a double-disk flange. The connecting flange 3 is arranged above the valve cover 1.1. The lower flange of the connecting flange 3 is fixedly connected to the upper flange of the valve cover 1.1;

[0038] See the attached description Figure 9: The drive sleeve 4 is cylindrical, with a drive sleeve keyway 4.1 in the inner hole, and four drive sleeve end grooves 4.2 evenly distributed on the lower end surface; the drive sleeve 4 is coaxially arranged on the upper end of the copper nut 1.7, and the drive sleeve end groove 4.2 is meshed with the copper nut boss 1.7.1;

[0039] See the instruction manual Figure 8 : The driving component 2 includes a servo motor 2.1 and a reducer 2.2. The servo motor 2.1 and the reducer 2.2 are transmission connected. The reducer 2.2 is provided with an output shaft 2.2.1; the driving component 2 is arranged on the upper part of the connecting flange 3, the reducer 2.2 is fixedly connected to the upper flange plate of the connecting flange 3, the output shaft 2.2.1 is inserted into the inner hole of the driving sleeve 4, and the output shaft 2.2.1 and the driving sleeve 4 transmit torque through a flat key. Embodiment 2:

[0040] See the instruction manual Figure 10 , 11 12, 13: In this embodiment, the overflow valve 1 includes a valve cover 1.1, a valve body 1.2, a valve stem 1.5, a valve core 1.6, a copper nut 1.7, a safety pin 1.8, and a pressure sensor 1.9; compared with the first embodiment, the valve cover and the valve seat pressure ring 1.3 in the first embodiment are structurally combined to form the valve cover 1.1 of the second embodiment; the valve body and the valve seat 1.4 in the first embodiment are structurally combined to form the valve body 1.2 of the second embodiment; the valve stem piston 1.5.2 on the valve stem 1.5 in the first embodiment is structurally combined with the valve core 1.6 to form the valve core 1.6 of the second embodiment. Compared with the valve core 1.6 in the first embodiment, the valve core 1.6 in the second embodiment has an increased valve core activity. Plug 1.6.4; Compared with the valve stem 1.5 of the first embodiment, the valve stem 1.5 of the second embodiment cancels the valve stem piston 1.5.2; a valve body cavity 1.2.1 is provided in the middle of the valve body 1.2 of this embodiment, a liquid inlet 1.2.2 is provided at the bottom of the valve body cavity 1.2.1, a liquid outlet 1.2.3 is provided on the side wall, and a pressure equalizing channel 1.2.4 is also provided in the side wall of the valve body 1.2, and a sensor mounting hole 1.2.5 is provided on the side wall of the liquid inlet 1.2.2, and the pressure equalizing channel 1.2.4 connects the upper part of the valve body cavity 1.2.1 with the liquid inlet 1.2.2, and the pressure sensor 1.9 is fixedly arranged in the sensor mounting hole 1.2.5; in this embodiment, the copper nut 1.7 and the safety pin 1.8 have the same structure as in the first embodiment;

[0041] In this embodiment, the valve core 1.6 of the valve stem assembly is movably arranged in the valve body cavity 1.2.1, and the screw head 1.5.1 extends into the bearing mounting hole of the valve cover 1.1; the copper nut 1.7 is threadedly engaged with the screw head 1.5.1, and thrust bearings are arranged on both the upper and lower end faces of the bearing positioning ring 1.7.2; the connecting flange 3 is arranged on the upper part of the valve cover 1.1, and the lower flange of the connecting flange 3 is fixedly connected to the upper end face of the valve cover 1.1; this embodiment simplifies the structure of the overflow valve 1, reduces the number of parts of the overflow valve 1, and reduces the cost of the overflow valve 1.

[0042] When the active control safety overflow valve is working, the fracturing fluid delivery pipeline is connected to the liquid inlet 1.2.2 of the overflow valve through a bypass pipeline, and the liquid outlet 1.2.3 of the overflow valve is connected to the fracturing fluid storage tank through a return pipeline. The pressure sensor 1.9 and the servo motor 2.1 are both electrically connected to the control system of the shale oil extraction fracturing system.

[0043] Taking the structure of Embodiment 1 as an example, the working process of the active control safety overflow valve is described as follows: When performing shale oil extraction fracturing operations, the ultra-high pressure liquid in the fracturing fluid delivery pipeline enters the liquid inlet 1.2.2 of the valve body 1.2 through a bypass pipeline, and the ultra-high pressure liquid exerts an upward force on the valve core 1.6; at the same time, the ultra-high pressure liquid also enters the upper part of the valve seat cavity 1.4.1 through the pressure equalizing channel 1.2.4 of the valve body 1.2 and the valve seat pressure equalizing hole 1.4.4 of the valve seat 1.4, exerting a downward force on the valve stem piston 1.5.2, and this force is finally transmitted to the valve core 1.6 through the valve stem 1.5; the downward force on the valve core 1.6 will offset part of the upward force, so it will improve the sealing effect of the valve core and reduce the leakage of the overflow valve;

[0044] The pressure sensor 1.9 continuously detects the pressure of the ultra-high pressure liquid at the liquid inlet 1.2.2. When the pressure sensor 1.9 detects that the pressure of the ultra-high pressure liquid exceeds the system set value, the control system controls the servo motor 2.1 to rotate clockwise. After being decelerated by the speed reducer 2.2, it rotates clockwise from the output shaft 2.2.1; the output shaft 2.2.1 drives the drive sleeve 4 to rotate clockwise, the drive sleeve 4 drives the copper nut 1.7 to rotate clockwise, and the clockwise rotation of the copper nut 1.7 drives the screw head 1.5.1 to move upward, so that the entire valve stem assembly moves upward, the valve core working surface 1.6.2 is separated from the valve seat working surface 1.4.2, and the ultra-high pressure liquid in the pressure relief valve 1 flows through the valve seat cavity 1.4.1 and is discharged from the liquid outlet 1.2.3, reducing the pressure in the fracturing fluid delivery pipeline;

[0045] When the pressure value of the ultra-high pressure liquid in the liquid inlet 1.2.2 detected by the pressure sensor 1.9 in real time is less than the set value of the set system, the control system controls the servo motor 2.1 to rotate counterclockwise, driving the valve stem assembly to move downward as a whole, and the valve core working surface 1.6.2 and the valve seat working surface 1.4.2 come into contact again to turn off the pressure relief valve 1, so that the pressure in the fracturing fluid delivery pipeline rises;

[0046] When the control system and the servo motor 2.1 fail and are unable to control the up and down movement of the valve stem 1.6, and the overflow valve 1 is in the closed state, if the pressure of the ultra-high pressure liquid exceeds the safety value set by the safety pin 1.8, the valve core 1.6 cuts off the safety pin 1.8 and moves upward, forcibly opening the overflow valve 1, thus ensuring the safety of the fracturing operation for shale gas exploitation.

[0047] During the working process of this active control safety overflow valve, the ultra-high pressure liquid will never erode the valve stem 1.5, improving the service life of the valve stem 1.5; in addition, when the valve stem 1.5 breaks, the overflow valve can still work normally for a short time, and the fracturing operation for shale gas exploitation will not be interrupted.

[0048] The parts not detailed in the present utility model are the prior art.

Claims

1. An actively controlled safety overflow valve, characterized in that: The device comprises a relief valve (1), a drive assembly (2), a connecting flange (3), and a drive sleeve (4); the relief valve (1) and the drive assembly (2) are fixedly connected via the connecting flange (3) and are transmission-connected via the drive sleeve (4); a pressure sensor (1.9) is fixedly provided in the relief valve (1), and a valve stem (1.5) is movably provided; a servo motor (2.1) is provided in the drive assembly (2); the pressure sensor (1.9) collects liquid pressure in the relief valve (1) and controls the action of the servo motor (2.1) in the drive assembly (2); the drive assembly (2) drives the valve stem (1.5) to move downward or upward via the drive sleeve (4), thereby controlling the overflow amount of the relief valve (1).

2. The active control safety overflow valve according to claim 1, characterized in that: The overflow valve (1) comprises a valve cover (1.1), a valve body (1.2), a valve seat pressure ring (1.3), a valve seat (1.4), a valve stem (1.5), and a valve core (1.6). The valve core (1.6) is fixedly arranged at the lower end of the valve stem (1.5) to form a valve stem assembly. A valve body cavity (1.2.1) is provided in the valve body (1.2). A liquid inlet (1.2.2) is provided at the bottom of the valve body cavity (1.2.1), and a liquid outlet (1.2.2) is provided on the side wall. 1.2.3); the valve seat pressing ring (1.3) and the valve seat (1.4) are stacked up and down and arranged in the valve body cavity (1.2.1); the valve cover (1.1) is fixedly arranged on the upper end of the valve body (1.2), and the lower end surface of the valve cover (1.1) abuts against the upper end surface of the valve seat pressing ring (1.3); a valve seat cavity (1.4.1) is arranged in the valve seat (1.4), and the valve core (1.6) of the valve stem assembly is movably arranged in the valve seat cavity (1.4.1).

3. The active control safety overflow valve according to claim 1, characterized in that: The overflow valve (1) further comprises a copper nut (1.7), which is rotatably arranged on the upper part of the valve cover (1.1) via a thrust bearing; a screw head (1.5.1) is arranged on the upper end of the valve stem (1.5); the screw head (1.5.1) is meshedly connected with the copper nut (1.7), and the copper nut (1.7) rotates to drive the valve stem (1.5) to move up and down.

4. The active control safety overflow valve according to claim 2, characterized in that: The valve core (1.6) is provided with a valve core hole ( 1.6.1), the lower end of the valve stem (1.5) is inserted into the valve core hole (1.6.1) and fixedly connected by a safety pin (1.8); a distance is set between the lower end surface of the valve stem (1.5) and the bottom surface of the valve core hole (1.6.1).

5. The active control safety overflow valve according to claim 2, wherein: A valve stem piston (1.5.2) is provided on the valve stem (1.5), and the valve stem piston (1.5.2) is movably arranged in the valve seat cavity (1.4.1) to divide the valve seat cavity (1.4.1) into upper and lower cavities; a pressure equalizing channel (1.2.4) is provided on the valve body (1.2), and a valve seat (1.4) is provided with a valve seat pressure equalizing hole (1.4.4); the pressure equalizing channel (1.2.4) and the valve seat pressure equalizing hole (1.4.4) connect the liquid outlet (1.2.3) of the valve body (1.2) with the upper cavity of the valve seat cavity (1.4.1) of the valve seat (1.4).

6. The active control safety overflow valve according to claim 2, characterized in that: A valve seat working surface (1.4.2) is provided at the bottom of the valve seat cavity (1.4.1); a valve core working surface (1.6.2) is provided at the bottom of the valve core (1.6); and both the valve seat working surface (1.4.2) and the valve core working surface (1.6.2) are conical surfaces.

7. The active control safety overflow valve according to claim 1, wherein: The drive assembly (2) includes a servo motor (2.1) and a speed reducer (2.2), and the servo motor (2.1) and the speed reducer (2.2) are drivingly connected; the speed reducer (2.2) is provided with an output shaft (2.2.1).

8. The actively controlled safety overflow valve according to claim 3 or 7, characterized in that: The speed reducer (2.2) is fixedly connected to the upper end surface of the connecting flange (3), and the valve cover (1.1) is fixedly connected to the lower end surface of the connecting flange (3); the drive sleeve (4) is fixedly connected to the output shaft (2.2.1); a copper nut (1.7) is arranged at the lower end of the drive sleeve (4) and is meshingly connected with the copper nut boss (1.7.1) through the drive sleeve end groove (4.2).

9. The active control safety overflow valve according to claim 1, wherein: The overflow valve (1) includes a valve cover (1.1), a valve body (1.2), a valve stem (1.5), and a valve core (1.6). The valve core (1.6) is fixedly arranged at the lower end of the valve stem (1.5) to form a valve stem assembly; a valve body cavity (1.2.1) is provided in the valve body (1.2), a liquid inlet (1.2.2) is provided at the bottom of the valve body cavity (1.2.1), and a liquid outlet (1.2.3) is provided on the side wall; the valve cover (1.1) is fixedly arranged at the upper end of the valve body (1.2), and the valve core (1.6) of the valve stem assembly is movably arranged in the valve seat cavity (1.4.1).

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