阅读说明：本技术 一种废油综合利用专用三通阀 (Special three-way valve for comprehensive utilization of waste oil ) 是由 王志飞 刘迅 张幸初 张星依 刘曦阳 王家琛 陈南南 楚洛亿 于 2021-08-23 设计创作，主要内容包括：一种废油综合利用专用三通阀,包括电动执行机构、阀芯驱动机构、三通阀；阀芯驱动机构上端与电动执行机构传动连接,下端与三通阀传动连接；通过阀芯驱动机构将电动执行机构的旋转运动转换为三通阀阀芯的提升、旋转、下压复合运动,通过提升阀芯使阀芯在旋转前先与阀座脱离,防止阀芯与阀座之间在旋转开关动作过程产生摩擦,因此彻底解决了阀芯与阀座间的磨损问题,极大提高了阀门的使用寿命。(A special three-way valve for waste oil comprehensive utilization comprises an electric actuator, a valve core driving mechanism and a three-way valve; the upper end of the valve core driving mechanism is in transmission connection with the electric actuating mechanism, and the lower end of the valve core driving mechanism is in transmission connection with the three-way valve; the rotary motion of the electric actuating mechanism is converted into lifting, rotating and pressing combined motion of the three-way valve core through the valve core driving mechanism, the valve core is separated from the valve seat before rotating through the lifting valve core, friction is prevented from being generated between the valve core and the valve seat in the rotary switch action process, the abrasion problem between the valve core and the valve seat is thoroughly solved, and the service life of the valve is greatly prolonged.)

1. A special three-way valve for comprehensive utilization of waste oil is characterized in that: comprises a valve core driving mechanism (2) and a three-way valve (3); the lower end of the valve core driving mechanism (2) is in transmission connection with the three-way valve (3); the valve core driving mechanism (2) comprises a driving mechanism shell (2.1), the driving mechanism shell (2.1) is in a step tubular shape, flanges are arranged at the upper end and the lower end of the driving mechanism shell, the lower end flange is fixedly connected with the three-way valve (3), and pin shaft grooves (2.1.1) with symmetrical axes are arranged at the lower part of the driving mechanism shell (2.1); an upper nut (2.2) is rotatably arranged on the inner side of the upper part of the driving mechanism shell (2.1) through a thrust bearing, and the upper nut (2.2) is rotatably connected with a double-end screw rod (2.3); the double-end screw rod (2.3) is in a short shaft shape, a shaft shoulder (2.3.1) is arranged in the middle, an upper belleville spring journal (2.3.2), a lower belleville spring journal (2.3.5), an upper friction disc journal (2.3.3), a lower friction disc journal (2.3.6), an upper screw rod head (2.3.4) and a lower screw rod head (2.3.7) are symmetrically arranged on two sides of the shaft shoulder (2.3.1), and trapezoidal threads with opposite rotation directions are arranged on the upper screw rod head (2.3.4) and the lower screw rod head (2.3.7); the upper screw head (2.3.4) is rotationally connected with the upper nut (2.2), an upper friction disc (2.5) is arranged at the position of an upper friction disc shaft neck (2.3.3), an upper belleville spring (2.6) is arranged at the position of an upper belleville spring shaft neck (2.3.2), a lower belleville spring (2.7) is arranged at the position of a lower belleville spring shaft neck (2.3.5), a lower friction disc (2.8) is arranged at the position of a lower friction disc shaft neck (2.3.6), a lower nut (2.4) is rotationally connected with the lower screw head (2.3.7), and a nut pin shaft hole (2.4.1) is arranged at the lower end of the lower nut (2.4).

2. The three-way valve for comprehensive utilization of waste oil as claimed in claim 1, wherein: the three-way valve (3) comprises a valve body (3.1), a feeding pipe combination (3.2), a discharging pipe combination A (3.3), a discharging pipe combination B (3.4), a valve core combination (3.5) and a valve cover (3.6); a cavity is arranged in the valve body (3.1), the feeding pipe combination (3.2) is fixedly arranged at the lower end of the valve body (3.1), and the discharging pipe combination A (3.3) and the discharging pipe combination B (3.4) are fixedly arranged on the adjacent side surfaces of the valve body (3.1); through holes are formed in the middle of the feeding pipe combination (3.2), the discharging pipe combination A (3.3) and the discharging pipe combination B (3.4), and the through holes are communicated with a cavity of the valve body (3.1); the valve cover (3.6) is provided with a through hole, and the valve cover (3.6) is fixedly arranged on the upper end surface of the valve body (3.1);

the valve core combination (3.5) comprises a valve core (3.5.1) and a valve rod (3.5.2), the valve rod (3.5.2) is fixedly arranged at the upper end of the valve core (3.5.1), and the upper part of the valve rod (3.5.2) is provided with a valve rod pin shaft hole (3.5.2.1); the valve rod (3.5.2) penetrates through a through hole on the valve cover (3.6), and the valve core (3.5.1) is movably arranged in a cavity of the valve body (3.1);

the three-way valve (3) is fixedly arranged at the lower end of the driving mechanism shell (2.1), and the valve rod (3.5.2) and the lower nut (2.4) are fixedly connected through a pin shaft (4).

3. The three-way valve for comprehensive utilization of waste oil as claimed in claim 2, wherein: the valve core (3.5.1) is in an inverted conical shape, the bottom of the valve core is provided with a valve core feeding hole (3.5.1.1), the side surface of the valve core is provided with a valve core discharging hole (3.5.1.2), and the valve core feeding hole (3.5.1.1) is communicated with the valve core discharging hole (3.5.1.2); the discharge pipe combination A (3.3) comprises a discharge pipe A, the discharge pipe combination B (3.4) comprises a discharge pipe B, one end of each of the discharge pipe A and the discharge pipe B extends into the cavity of the valve body (3.1), and the end face of each of the discharge pipe A and the discharge pipe B is provided with a valve seat matched with the valve core (3.5.1) in shape; when the valve core (3.5.1) rotates in the cavity of the valve body (3.1), the valve core (3.5.1) is matched with the valve seat, so that the communication between the feeding pipe combination (3.2) and the discharging pipe combination A (3.3) or the communication between the feeding pipe combination (3.2) and the discharging pipe combination B (3.4) is realized.

4. The three-way valve for comprehensive utilization of waste oil as claimed in claim 3, wherein: the feeding pipe assembly (3.2) comprises a feeding pipe (3.2.1), the upper end of the feeding pipe (3.2.1) extends into a cavity of the valve body (3.1), and the top of the feeding pipe (3.2.1) is provided with four valve core positioning heads (3.2.1.1) which are uniformly distributed around an axis; the bottom of the valve core is also provided with four valve core positioning grooves (3.5.1.3) which are uniformly distributed around the axis; when the valve core (3.5.1) rotates in the cavity of the valve body (3.1), the valve core positioning groove (3.5.1.3) is matched with the valve core positioning head (3.2.1.1) to realize the rotary positioning of the valve core (3.5.1).

5. The three-way valve for comprehensive utilization of waste oil as claimed in claim 1, wherein: the electric actuator (1) is provided with a torque control system; the electric actuator (1) is fixedly arranged at the upper part of the valve core driving mechanism (2), and the electric actuator (1) is connected with the upper nut (2.2) in a driving way.

Technical Field

The invention relates to the technical field of valves of waste oil comprehensive utilization devices in petrochemical industry, in particular to a special three-way valve for waste oil comprehensive utilization.

Background

The comprehensive utilization of waste oil in cracking process needs a great amount of catalyst particles with high hardness, which has abrasion effect on the pipeline and valve, especially when the common valve is installed on the pipeline of the working medium, the valve core of the valve has serious friction with the valve seat in the process of rotating switch action, which causes the valve core and the valve seat to be abraded in a short time, and the valve has the conditions of poor sealing, internal leakage and the like, therefore, when the common valve is applied to the comprehensive utilization device of waste oil, the service life is short.

Disclosure of Invention

In order to overcome the defects in the background art, the invention discloses a special three-way valve for comprehensively utilizing waste oil, which comprises an electric actuating mechanism, a valve core driving mechanism and a three-way valve; the upper end of the valve core driving mechanism is in transmission connection with the electric actuating mechanism, and the lower end of the valve core driving mechanism is in transmission connection with the three-way valve; the rotary motion of the electric actuating mechanism is converted into lifting, rotating and pressing combined motion of the three-way valve core through the valve core driving mechanism, the valve core is separated from the valve seat before rotating through lifting the valve core, and friction generated in the action process of the rotary switch by the valve core is prevented.

In order to realize the purpose, the invention adopts the following technical scheme: a special three-way valve for waste oil comprehensive utilization comprises an electric actuator, a valve core driving mechanism and a three-way valve; the upper end of the valve core driving mechanism is in transmission connection with the electric actuating mechanism, and the lower end of the valve core driving mechanism is in transmission connection with the three-way valve; the valve core driving mechanism converts the rotary motion of the electric actuating mechanism into lifting, rotating and pressing combined motion of the valve core of the three-way valve, and the valve core is separated from the valve seat before rotating by lifting the valve core, so that friction between the valve core and the valve seat in the action process of the rotary switch is prevented; the valve core driving mechanism comprises a driving mechanism shell, the driving mechanism shell is in a step tubular shape, the upper part of the driving mechanism shell is a driving mechanism shell neck, the lower part of the driving mechanism shell is a driving mechanism shell body, flanges are arranged at the upper end and the lower end of the driving mechanism shell, the upper end flange is fixedly connected with the electric actuating mechanism, the lower end flange is fixedly connected with the three-way valve, pin shaft grooves with symmetrical axes are arranged at the lower part of the driving mechanism shell, and the pin shaft grooves are matched with pin shafts connected with a lower nut and a valve core rod to limit the rotation angle of the positioning valve core; the inner side of the upper part of the driving mechanism shell is rotatably provided with an upper nut which is driven to rotate by the electric actuating mechanism through a thrust bearing, the upper nut can rotate clockwise or anticlockwise, and the upper nut is rotatably connected with a double-head screw rod; the double-end screw rod is in a short shaft shape, a shaft shoulder is arranged in the middle of the double-end screw rod, an upper butterfly spring shaft neck and a lower butterfly spring shaft neck, an upper friction disc shaft neck and a lower friction disc shaft neck, an upper screw rod head and a lower screw rod head are symmetrically arranged on two sides of the shaft shoulder, trapezoidal threads are arranged on the upper screw rod head and the lower screw rod head, and the rotating directions of the trapezoidal threads of the upper screw rod head and the lower screw rod head are opposite; the upper screw rod head is rotationally connected with the upper nut, and the lower screw rod head is rotationally connected with the lower nut; an upper friction disc is arranged at the shaft neck of the upper friction disc, an upper belleville spring is arranged at the shaft neck of the upper belleville spring, and the upper nut, the upper friction disc, the upper belleville spring and the upper end surface of the shaft shoulder are sequentially abutted; a lower belleville spring is arranged at the shaft neck of the lower belleville spring, and a lower friction disc is arranged at the shaft neck of the lower friction disc; the lower end surface of the shaft shoulder, the lower belleville spring, the lower friction disc and the lower nut are sequentially abutted; the lower end of the lower nut is provided with a nut pin shaft hole.

Further, the three-way valve comprises a valve body, a feeding pipe combination, a discharging pipe combination A, a discharging pipe combination B, a valve core combination and a valve cover; a cavity is arranged inside the valve body; the feeding pipe combination is fixedly arranged at the lower end of the valve body, and the discharging pipe combination A and the discharging pipe combination B are fixedly arranged on the adjacent side surfaces of the valve body; through holes are formed in the middle of the feeding pipe combination, the discharging pipe combination A and the discharging pipe combination B and are communicated with the cavity of the valve body; the valve cover is provided with a through hole and is fixedly arranged on the upper end surface of the valve body;

the valve core assembly comprises a valve core and a valve rod, the valve rod is fixedly arranged at the upper end of the valve core, and the upper part of the valve rod is provided with a valve rod pin shaft hole; the valve rod passes through a through hole on the valve cover, and the valve core is movably arranged in the cavity of the valve body;

the three-way valve is fixedly arranged at the lower end of the driving mechanism shell, a valve rod pin shaft hole in the upper portion of the valve rod is matched with a nut pin shaft hole, and the valve rod is fixedly connected with the lower nut through a pin shaft.

Furthermore, the valve core is in an inverted conical shape, when the valve core is lifted upwards, the valve core is separated from the valve seat to generate a gap, and friction between the valve core and the valve seat is prevented when the valve core rotates; the bottom of the valve core is provided with a valve core feeding hole, the side surface of the valve core is provided with a valve core discharging hole, and the valve core feeding hole is communicated with the valve core discharging hole; the discharge pipe combination A comprises a discharge pipe A, the discharge pipe combination B comprises a discharge pipe B, one end of each of the discharge pipe A and the discharge pipe B extends into the cavity of the valve body, and a valve seat matched with the valve core in shape is arranged on the end face extending to the cavity of the valve body; the valve core is matched with the valve seat, when the discharge hole corresponds to the discharge pipe combination A, working media enter the valve from the feed pipe combination and flow out from the discharge pipe combination A, when the valve core rotates 90 degrees, the discharge hole of the valve core corresponds to the discharge pipe combination B, the working media enter the valve from the feed pipe combination and flow out from the discharge pipe combination B, and switching control of the flow direction of the working media is realized.

Furthermore, the feeding pipe combination comprises a feeding pipe, and the top of the feeding pipe is provided with valve core positioning heads uniformly distributed around the axis; the bottom of the valve core is also provided with four valve core positioning grooves which are uniformly distributed around the axis; when the valve core rotates in the cavity of the valve body, the valve core positioning groove is matched with the valve core positioning head, and the rotary positioning of the valve core is realized.

Furthermore, the electric actuating mechanism is provided with a torque control system, and when the valve state is switched, whether the control valve core moves in place or not is judged through the torque control system of the electric actuating mechanism.

Due to the adoption of the technical scheme, the invention has the following beneficial effects: the invention discloses a special three-way valve for comprehensive utilization of waste oil, which comprises an electric actuating mechanism, a valve core driving mechanism and a three-way valve; the upper end of the valve core driving mechanism is in transmission connection with the electric actuating mechanism, and the lower end of the valve core driving mechanism is in transmission connection with the three-way valve; the rotary motion of the electric actuating mechanism is converted into lifting, rotating and pressing combined motion of the three-way valve core through the valve core driving mechanism, the valve core is separated from the valve seat before rotating through the lifting valve core, friction is prevented from being generated between the valve core and the valve seat in the rotary switch action process, the abrasion problem between the valve core and the valve seat is thoroughly solved, and the service life of the valve is greatly prolonged.

Drawings

FIG. 1 is an appearance schematic diagram of a three-way valve for comprehensive utilization of waste oil;

FIG. 2 is a schematic sectional view of the valve core driving mechanism;

FIG. 3 is a schematic cross-sectional view of the turntable assembly;

FIG. 4 is an external view of the housing of the driving mechanism;

FIG. 5 is a schematic structural view of a double-headed screw rod;

FIG. 6 is a schematic cross-sectional view of a three-way valve;

FIG. 7 is a schematic view of an assembly structure of the valve body and each pipe fitting;

FIG. 8 is a schematic view of the feed pipe assembly;

fig. 9 is an appearance view of the valve core assembly.

In the figure: 1. an electric actuator; 2. a valve core drive mechanism; 2.1, a driving mechanism shell; 2.1.1, pin shaft grooves; 2.2, screwing a nut; 2.3, a double-end screw rod; 2.3.1, a shaft shoulder; 2.3.2, an upper belleville spring journal; 2.3.3, an upper friction disc journal; 2.3.4, mounting a screw head; 2.3.5, a lower belleville spring journal; 2.3.6, a lower friction disc journal; 2.3.7, lower screw head; 2.4, lower nuts; 2.4.1, nut pin shaft holes; 2.5, an upper friction disc; 2.6, an upper belleville spring; 2.7, a lower belleville spring; 2.8, a lower friction disc; 3. a three-way valve; 3.1, a valve body; 3.2, combining a feeding pipe; 3.2.1, a feeding pipe; 3.2.1.1, a valve core positioning head; 3.3, combining a discharge pipe A; 3.4, combining a discharge pipe with a discharge pipe B; 3.5, combining the valve cores; 3.5.1, valve core; 3.5.1.1, a valve core feed inlet; 3.5.1.2, valve core discharge hole; 3.5.1.3, a valve core positioning groove; 3.5.2, a valve rod; 3.5.2.1, a stem pintle hole; 3.6, valve cover; 4. and (7) a pin shaft.

Detailed Description

The present invention will be explained in detail by the following examples, which are disclosed for the purpose of protecting all technical improvements within the scope of the present invention.

A special three-way valve for waste oil comprehensive utilization comprises an electric actuator 1, a valve core driving mechanism 2 and a three-way valve 3, wherein the electric actuator 1 is provided with a torque control system;

the valve core driving mechanism 2 comprises a driving mechanism shell 2.1, the driving mechanism shell 2.1 is in a step tubular shape, flanges are arranged at the upper end and the lower end of the driving mechanism shell, the upper end flange is fixedly connected with the electric actuating mechanism 1, and pin shaft grooves 2.1.1 with symmetrical axes are arranged at the lower part of the driving mechanism shell; an upper nut 2.2 driven by the electric actuating mechanism 1 to rotate is rotatably arranged on the inner side of the upper part of the driving mechanism shell 2.1 through a thrust bearing, and the upper nut 2.2 is rotatably connected with a double-head screw rod 2.3; the double-end screw rod 2.3 is in a short shaft shape, the middle of the double-end screw rod is provided with a shaft shoulder 2.3.1, the two sides of the shaft shoulder 2.3.1 are symmetrically provided with an upper butterfly spring shaft neck 2.3.2, a lower butterfly spring shaft neck 2.3.5, an upper friction disc shaft neck 2.3.3, a lower friction disc shaft neck 2.3.6, an upper screw rod head 2.3.4 and a lower screw rod head 2.3.7, the upper screw rod head 2.3.4 is provided with trapezoidal threads rotating clockwise, and the lower screw rod head 2.3.7 is provided with trapezoidal threads rotating anticlockwise; the upper screw head 2.3.4 is rotationally connected with the upper nut 2.2, the lower screw head 2.3.7 is rotationally connected with the lower nut 2.4, the upper friction disc 2.5 is arranged at the position of the upper friction disc shaft neck 2.3.3, the upper disc spring 2.6 is arranged at the position of the upper disc spring shaft neck 2.3.2, the lower disc spring 2.7 is arranged at the position of the lower disc spring shaft neck 2.3.5, the lower friction disc 2.8 is arranged at the position of the lower friction disc shaft neck 2.3.6, the lower screw head 2.3.7 is rotationally connected with the lower nut 2.4, and the lower end of the lower nut 2.4 is provided with a pin shaft hole 2.4.1;

the three-way valve 3 comprises a valve body 3.1, a feeding pipe combination 3.2, a discharging pipe combination A3.3, a discharging pipe combination B3.4, a valve core combination 3.5 and a valve cover 3.6, wherein the feeding pipe combination 3.2 comprises a feeding pipe 3.2.1, and symmetrical valve core positioning heads 3.2.1.1 are arranged at the top of the feeding pipe 3.2.1; a cavity is arranged inside the valve body 3.1; the feeding pipe combination 3.2 is fixedly arranged at the lower end of the valve body 3.1, and the discharging pipe combination A3.3 and the discharging pipe combination B3.4 are fixedly arranged on the adjacent side surfaces of the valve body 3.1; through holes are formed in the middle of the feeding pipe combination 3.2, the discharging pipe combination A3.3 and the discharging pipe combination B3.4 and communicated with the cavity of the valve body 3.1; the valve cover 3.6 is provided with a through hole, and the valve cover 3.6 is fixedly arranged on the upper end surface of the valve body 3.1;

the valve core assembly 3.5 comprises a valve core 3.5.1 and a valve rod 3.5.2, the upper part of the valve rod 3.5.2 is provided with a valve rod pin shaft hole 3.5.2.1, and the valve rod 3.5.2 is fixedly arranged at the upper end of the valve core 3.5.1; the valve rod 3.5.2 penetrates through a through hole on the valve cover 3.6, and the valve core 3.5.1 is movably arranged in a cavity of the valve body 3.1; the bottom of the valve core 3.5.1 is provided with a valve core feeding hole 3.5.1.1, the side surface is provided with a valve core discharging hole 3.5.1.2, and the valve core feeding hole 3.5.1.1 is communicated with a valve core discharging hole 3.5.1.2; the bottom of the valve core is also provided with four valve core positioning grooves 3.5.1.3 which are uniformly distributed around the axis; the discharge pipe combination A3.3 comprises a discharge pipe A, the discharge pipe combination B3.4 comprises a discharge pipe B, one end of each of the discharge pipe A and the discharge pipe B is arranged in a cavity of the valve body 3.1, and a valve seat matched with the valve core 3.5.1 in shape is arranged on the end face;

the three-way valve 3 is fixedly arranged at the lower end of the driving mechanism shell 2.1, and the valve rod 3.5.2 is fixedly connected with the lower nut 2.4 through a pin shaft 4.

The working process of the special three-way valve for comprehensive utilization of waste oil is detailed as follows:

initial state of the three-way valve: the valve core 3.5.1 is abutted against the valve seat, the valve core positioning head 3.2.1.1 is clamped in the valve core positioning groove 3.5.1.3, and the valve core discharge port 3.5.1.2 corresponds to the discharge pipe combination A3.3; the upper belleville spring 2.6 is in a compressed state, and the lower belleville spring 2.7 is in a relaxed state;

and (3) switching the states of the three-way valves: the electric actuating mechanism 1 drives the upper nut 2.2 to rotate anticlockwise, at the moment, the upper belleville spring 2.6 is in a compression state, and the lower belleville spring 2.7 is in a release state, so that the friction between the upper friction disc 2.5 and the upper nut 2.2 is greater than the friction between the lower friction disc 2.8 and the lower nut 2.4, and the double-end screw rod 2.3 rotates anticlockwise along with the upper nut 2.2; at the moment, the valve core positioning head 3.2.1.1 is clamped in the valve core positioning groove 3.5.1.3, the valve core 3.5.1 cannot rotate, so that the lower nut 2.4 fixedly connected with the valve rod 3.5.2 cannot rotate, the lower nut 2.4 moves upwards under the action of anticlockwise rotation of the double-end screw rod 2.3 to drive the valve core 3.5.1 to move upwards, the valve core 3.5.1 is separated from the valve seat, and the lower butterfly spring 2.7 is compressed; with the increase of the compression amount of the lower belleville spring 2.7, the friction between the lower friction disc 2.8 and the lower nut 2.4 is increased, and when the friction between the lower friction disc and the lower nut is increased to a certain degree, the lower nut 2.4 rotates anticlockwise along with the double-head screw rod 2.3 to drive the valve core 3.5.1 to rotate anticlockwise; when the pin shaft 4 is contacted with the side wall of one side of the pin shaft groove 2.1.1, the valve core 3.5.1 and the lower nut 2.4 stop rotating, and the lower nut 2.4 moves upwards along with the continuous anticlockwise rotation of the upper nut 2.2 and the double-head screw rod 2.3 to continuously compress the lower belleville spring 2.7; along with the continuous increase of the compression amount of the lower belleville spring 2.7, the friction between the lower friction disc 2.8 and the lower nut 2.4 is continuously increased until the friction between the lower friction disc 2.8 and the lower nut 2.4 is greater than the friction between the upper friction disc 2.5 and the upper nut 2.2, the double-end lead screw 2.3 cannot continuously rotate along with the upper nut 2.2, the double-end lead screw 2.3 starts to move downwards to drive the valve rod 3.5.2 and the valve core 3.5.1 to move downwards, the valve core positioning head 3.2.1.1 is clamped in the valve core positioning groove 3.5.1.3, the valve core 3.5.1 is abutted against the valve seat, at the moment, the upper belleville spring 2.6 is in a relaxed state, and the lower belleville spring 2.7 is in a compressed state; when the valve core 3.5.1 is abutted against the valve seat, the output torque of the electric actuating mechanism 1 rises, and when the torque control system detects that the output torque of the electric actuating mechanism 1 rises to a set value, the electric actuating mechanism 1 is controlled to stop rotating; the state switching of the three-way valve is completed;

switching the state of the three-way valve: the electric actuator 1 drives the upper nut 2.2 to rotate clockwise, at this time, the upper belleville spring 2.6 is in a relaxed state, and the lower belleville spring 2.7 is in a compressed state, so that the friction between the upper friction disc 2.5 and the upper nut 2.2 is smaller than the friction between the lower friction disc 2.8 and the lower nut 2.4, the double-end lead screw 2.3 keeps a non-rotating state along with the lower nut 2.4, the double-end lead screw 2.3 does ascending movement under the clockwise rotation action of the upper nut 2.2, the valve core 3.5.1 is driven to move upwards, the valve core 3.5.1 is separated from the valve seat, and the upper belleville spring 2.6 is compressed at the same time; along with the increase of the compression amount of the upper belleville spring 2.6, the friction between the upper friction disc 2.5 and the upper nut 2.2 is increased, and when the friction between the upper friction disc and the upper nut is increased to a certain degree, the upper nut 2.2 rotates clockwise along with the double-end screw rod 2.3 to drive the valve core 3.5.1 to rotate clockwise; when the pin shaft 4 is contacted with the side wall of the other side of the pin shaft groove 2.1.1, the valve core 3.5.1 and the lower nut 2.4 stop rotating clockwise, and the double-end screw rod 2.3 continues to move upwards along with the continuous clockwise rotation of the upper nut 2.2 and the double-end screw rod 2.3, and continues to compress the upper belleville spring 2.6; along with the continuous increase of the compression amount of the upper belleville spring 2.6, the friction between the upper friction disc 2.5 and the upper nut 2.2 is continuously increased until the friction between the upper friction disc 2.5 and the upper nut 2.2 is greater than the friction between the lower friction disc 2.8 and the lower nut 2.4, the lower nut 2.4 cannot continuously rotate along with the double-end screw rod 2.3, the lower nut 2.4 starts to move downwards to drive the valve rod 3.5.2 and the valve core 3.5.1 to move downwards, the valve core positioning head 3.2.1.1 is clamped in the valve core positioning groove 3.5.1.3, and the valve core 3.5.1 is abutted to the valve seat; when the valve core 3.5.1 is abutted against the valve seat, the output torque of the electric actuating mechanism 1 is increased, when the torque control system detects that the output torque of the electric actuating mechanism 1 is increased to a set value, the electric actuating mechanism 1 is controlled to stop rotating, the three-way valve is restored to the initial state at the moment, and the state of the three-way valve is switched again.

The present invention is not described in detail in the prior art.