阅读说明：本技术 低扭矩自检漏球阀 (Low-torque self-checking ball-leakage valve ) 是由 孙宁 颜志汉 王宝建 刘凯磊 康绍鹏 于 2019-12-05 设计创作，主要内容包括：本发明公开了一种低扭矩自检漏球阀,它包括本体、阀芯、两个阀座、与所述阀座一一对应的弹性装置和阀座驱动装置；所述本体设有介质通道,所述阀芯旋转连接在所述介质通道中,所述阀座滑动连接在所述介质通道中,所述阀芯的两侧各设有一个所述阀座,所述弹性装置设于对应的阀座和所述本体之间,所述弹性装置用于驱动所述阀座抵接在所述阀芯上；所述阀座驱动装置安装在所述本体上并与两个所述阀座相连,所述阀座驱动装置用于驱动两个所述阀座克服其对应的弹性装置的弹力向脱离所述阀芯的方向移动。本发明能够减少旋转阀芯所需的扭矩,利于操作人员操作,并且能够及时检测球阀是否发生泄漏,以便及时维修,减少经济损失,降低环境污染。(The invention discloses a low-torque self-leakage-detection ball valve which comprises a body, a valve core, two valve seats, elastic devices and valve seat driving devices, wherein the elastic devices and the valve seat driving devices correspond to the valve seats one by one; the valve body is provided with a medium channel, the valve core is rotationally connected in the medium channel, the valve seats are slidably connected in the medium channel, two sides of the valve core are respectively provided with one valve seat, the elastic device is arranged between the corresponding valve seat and the body, and the elastic device is used for driving the valve seats to abut against the valve core; the valve seat driving device is arranged on the body and connected with the two valve seats, and the valve seat driving device is used for driving the two valve seats to move in the direction of being separated from the valve core by overcoming the elasticity of the corresponding elastic devices. The invention can reduce the torque required by rotating the valve core, is beneficial to the operation of operators, and can detect whether the ball valve leaks or not in time so as to be convenient for maintenance in time, reduce economic loss and reduce environmental pollution.)

1. A low torque self leak detection ball valve, comprising:

a body provided with a medium channel (1);

a valve core (2) which is rotatably connected in the medium channel (1) and is used for plugging or opening the medium channel (1) in the rotating process;

two valve seats (3) which are connected in the medium channel (1) in a sliding manner, wherein two sides of the valve core (2) are respectively provided with one valve seat (3);

the elastic devices correspond to the valve seats (3) one by one and are arranged between the corresponding valve seats (3) and the bodies, one end parts of the elastic devices are abutted against the bodies, and the other end parts of the elastic devices are abutted against the corresponding valve seats (3), so that the elastic devices drive the valve seats (3) to abut against the valve cores (2);

and the valve seat driving device is arranged on the body and connected with the two valve seats (3), and is used for acting to drive the two valve seats (3) to move in the direction of being separated from the valve core (2) by overcoming the elasticity of the corresponding elastic devices.

2. The low-torque self leak detection ball valve according to claim 1, further comprising a valve stem (4) connected to an upper end portion of the valve element (2) and adapted to be driven to rotate the valve element (2), the valve seat driving means comprising:

an outer collar (5) rotatably sleeved on the valve rod (4);

a cam assembly (6) connected to the outer collar (5);

the valve seat pushing pieces (7) are connected in the body in a sliding mode and correspond to the valve seats (3) one by one, one end of each valve seat pushing piece (7) abuts against the outer peripheral portion of the corresponding valve seat (3), and the other end of each valve seat pushing piece (7) abuts against the cam component (6);

and the rotary driving device is connected with the outer sleeve ring (5) and is used for driving the outer sleeve ring (5) to rotate so as to drive the cam assembly (6) to rotate, and further driving the valve seat pushing piece (7) to move so as to drive the valve seat (3) to move in a direction of being separated from the valve core (2) against the elastic force of the elastic device.

3. The low torque self leak detection ball valve in accordance with claim 2, wherein said cam assembly (6) comprises:

a cam seat (8) connected to the outer collar (5), wherein the outer periphery of the cam seat (8) is provided with two opposite far end parts (9) and two opposite near end parts (10), and the far end parts (9) and the near end parts (10) are arranged at intervals along the circumferential direction of the cam seat (8);

the plurality of rollers (11) are distributed along the circumferential direction of the cam seat (8) and are rotatably connected to the outer circumferential part of the cam seat (8), and the rollers (11) are used for abutting against the valve seat pushing piece (7) in the process that the cam seat (8) rotates along with the outer sleeve ring (5).

4. The low torque self leak detection ball valve in accordance with claim 2, wherein said rotary drive means comprises:

a driven gear (12) connected to the outer collar (5);

a driving gear (13) rotatably connected to the body and engaged with the driven gear (12);

and the driving motor (14) is connected to the body and is connected with the driving gear (13), so that the driving motor (14) drives the driving gear (13) to rotate, and further drives the driven gear (12) and the outer sleeve ring (5) to rotate.

5. The low-torque self leak detection ball valve according to claim 2, further comprising a lower support member (15) provided on the body and connected to the lower end portion of the spool (2) to support the lower end portion of the spool (2);

at least one lower sealing ring (16) used for abutting against the body to connect the lower support member (15) and the body in a sealing way is embedded on the peripheral wall of the lower support member (15);

the lower support piece (15) is also connected with movable pushing pieces (17) which correspond to the valve seat pushing pieces (7) one by one in a sliding manner;

a movable elastic piece (18) is arranged between the movable pushing piece (17) and the lower supporting piece (15), one end of the movable elastic piece (18) is abutted against the lower supporting piece (15), and the other end of the movable elastic piece (18) is abutted against one end of the movable pushing piece (17), so that the movable pushing piece (17) is driven by the movable elastic piece (18) to move, and the other end of the movable pushing piece (17) is abutted against the corresponding valve seat pushing piece (7).

6. The low torque self leak detection ball valve in accordance with claim 1,

the elastic device comprises at least two abutting elastic pieces (19) which are distributed along the circumferential direction of the corresponding valve seat (3) and connected between the corresponding valve seat (3) and the body, one end of each abutting elastic piece (19) abuts against the corresponding valve seat (3), and the other end of each abutting elastic piece (19) abuts against the body.

7. The low torque self leak detection ball valve in accordance with claim 1,

a side sealing ring which is used for abutting against the channel wall of the medium channel (1) so as to hermetically connect the valve seat (3) and the body is embedded on the outer peripheral wall of the valve seat (3);

and an end part sealing ring (20) which is used for abutting against the valve core (2) to hermetically connect the valve seat (3) and the valve core (2) is embedded at the end part of the valve seat (3) close to the valve core (2).

8. The low torque self leak detection ball valve in accordance with claim 1,

in a medium flow direction in a medium passage (1), the medium passage (1) includes an inlet passage (21) on an upstream side of the spool (2) and an outlet passage (22) on a downstream side of the spool (2);

the low torque self leak-detecting ball valve further includes leak detection means connected to the body for collecting an inlet pressure in the inlet passage (21) and an outlet pressure in the outlet passage (22) to determine whether a leak has occurred based on the inlet pressure and the outlet pressure.

9. The low-torque self-leak-detection ball valve according to claim 8, wherein the leak detection device comprises an inlet sensor (23), an outlet sensor (24), a signal collector (25), a controller (26) and an alarm device (27); wherein the content of the first and second substances,

the inlet sensor (23) is connected with the inlet channel (21) and is used for detecting the inlet pressure in the inlet channel (21);

the outlet sensor (24) is connected to the outlet channel (22) and is used for detecting the outlet pressure in the outlet channel (22);

the input end of the signal collector (25) is respectively connected with the inlet sensor (23) and the outlet sensor (24), and the output end of the signal collector (25) is connected with the controller (26), so that the signal collector (25) receives an inlet pressure signal measured by the inlet sensor (23) and an outlet pressure signal measured by the outlet sensor (24), and sends the inlet pressure signal and the outlet pressure signal to the controller (26);

the controller (26) is in control connection with the alarm device (27), the controller (26) is used for making a difference between the received inlet pressure signal and the received outlet pressure signal, and when the difference value is smaller than a preset value, the controller (26) controls the alarm device (27) to act so as to give an alarm.

10. The low-torque self leak detection ball valve according to claim 1, wherein the body includes two left and right bodies (28) in one-to-one correspondence with the valve seat (3) and a middle valve body assembly connected between the two left and right bodies (28); wherein the content of the first and second substances,

the medium channel (1) sequentially passes through one of the left and right bodies (28), the middle valve body assembly and the other left and right bodies (28);

the left body and the right body (28) are internally provided with an assembly groove for assembling the corresponding valve seat (3), and the valve seat (3) is connected in the assembly groove in the corresponding left body and the right body (28) in a sliding way;

the elastic device is arranged between the corresponding valve seat (3) and the corresponding left and right bodies (28);

the valve seat driving device is connected to the middle valve body assembly.

Technical Field

The invention relates to a low-torque self-leakage-detection ball valve.

Background

At present, the ball valve is suitable for long-distance pipelines and general industrial pipelines, the strength, the safety, the severe environment resistance and the like of the ball valve are specially considered in the design process, and the ball valve can adapt to various corrosive and non-corrosive media. When the ball valve works, acting force generated by fluid pressure before the valve on the valve core is completely transmitted to the bearing, so that the valve seat can not bear overlarge pressure, the deformation of the valve seat of the ball valve is small, the sealing performance of the ball valve is stable, the service life of the ball valve is long, and the ball valve is suitable for high-pressure and large-caliber pipelines.

The opening and closing piece of the traditional ball valve is a valve core, the purpose of plugging and opening a medium channel is realized by utilizing the rotation of the valve core, valve seats are symmetrically arranged on two sides of the valve core, one side of each valve seat is sealed with the valve core through a sealing ring, an elastic piece is arranged on the other side of each valve seat, and the valve seats are abutted to the valve cores under the elastic action of the elastic pieces. Therefore, the valve core needs to bear the sealing pressure from the valve seat, and further generates friction force, so that the resistance force applied to the valve core in the rotating process is increased, the torsion force required by the rotating valve core is increased, and the operation of an operator is not facilitated. And because the ball valve is worn and corroded for a long time, the joint surface of the ball valve can be damaged, medium leakage is caused, economic loss and environmental pollution are caused, and the ball valve is often arranged in a remote and concealed place and mainly depends on manual detection, so that the leakage of the ball valve cannot be found in time.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a low-torque self-leakage-detection ball valve which can reduce the torque required by a rotary valve core, is beneficial to operation of operators, can detect whether the ball valve leaks or not in time so as to maintain in time, reduce economic loss and reduce environmental pollution.

In order to solve the technical problems, the technical scheme of the invention is as follows: a low torque self leak detection ball valve comprising:

a body provided with a medium passage;

a valve core rotatably connected in the medium passage and used for blocking or opening the medium passage during rotation;

two valve seats are slidably connected in the medium channel, and two sides of the valve core are respectively provided with one valve seat;

the elastic devices correspond to the valve seats one by one and are arranged between the corresponding valve seats and the body, one end parts of the elastic devices are abutted against the body, and the other end parts of the elastic devices are abutted against the corresponding valve seats, so that the elastic devices drive the valve seats to abut against the valve cores;

and the valve seat driving device is arranged on the body and connected with the two valve seats, and is used for acting to drive the two valve seats to move in the direction of being separated from the valve core by overcoming the elasticity of the corresponding elastic devices.

Further provides a specific solution of the valve seat driving device, the low-torque self-leak-detection ball valve further includes a valve rod connected to an upper end of the valve element and configured to be driven to rotate so as to drive the valve element to rotate, and the valve seat driving device includes:

an outer collar rotatably sleeved on the valve rod;

a cam assembly connected to the outer collar;

the valve seat pushing pieces are connected in the body in a sliding mode and correspond to the valve seats one by one, one end of each valve seat pushing piece abuts against the outer peripheral portion of the corresponding valve seat, and the other end of each valve seat pushing piece abuts against the cam component;

and the rotary driving device is connected with the outer sleeve ring and is used for driving the outer sleeve ring to rotate so as to drive the cam assembly to rotate, and further driving the valve seat pushing piece to move so as to drive the valve seat to move in a direction of being separated from the valve core by overcoming the elastic force of the elastic device.

Further provided is an embodiment of the cam module, which includes:

a cam seat connected to the outer collar, wherein the outer periphery of the cam seat is provided with two opposite far end parts and two opposite near end parts, and the far end parts and the near end parts are arranged at intervals along the circumferential direction of the cam seat;

and the rollers are distributed along the circumferential direction of the cam seat and are rotatably connected with the outer peripheral part of the cam seat, and the rollers are used for abutting against the valve seat pushing piece in the process that the cam seat rotates along with the outer sleeve ring.

Further, there is provided a specific aspect of the rotary drive device, including:

a driven gear connected to the outer collar;

the driving gear is rotatably connected to the body and meshed with the driven gear;

and the driving motor is connected to the body and is connected with the driving gear, so that the driving gear is driven by the driving motor to rotate, and the driven gear and the outer sleeve ring are driven to rotate.

Furthermore, the low-torque self-leakage-detection ball valve also comprises a lower support piece which is arranged on the body and connected with the lower end part of the valve core so as to support the lower end part of the valve core;

at least one lower sealing ring used for abutting against the body to be connected with the lower supporting piece and the body in a sealing mode is embedded in the peripheral wall of the lower supporting piece;

the lower support piece is also connected with movable pushing pieces which are in one-to-one correspondence with the valve seat pushing pieces in a sliding manner;

and a movable elastic piece is arranged between the movable pushing piece and the lower supporting piece, one end of the movable elastic piece is abutted against the lower supporting piece, and the other end of the movable elastic piece is abutted against one end of the movable pushing piece, so that the movable elastic piece drives the movable pushing piece to move, and the other end of the movable pushing piece is abutted against the corresponding valve seat pushing piece.

Further provide a concrete scheme of resilient means, resilient means includes that at least two distribute along the circumference of the disk seat that corresponds, and connect in the disk seat that corresponds and the butt elastic component between the body, one end of butt elastic component offsets with the disk seat that corresponds, another tip of butt elastic component with the body offsets.

Furthermore, a side sealing ring which is used for abutting against the channel wall of the medium channel so as to connect the valve seat and the body in a sealing way is embedded on the outer peripheral wall of the valve seat;

and an end part sealing ring which is used for abutting against the valve core so as to be connected with the valve seat and the valve core in a sealing way is embedded at the end part of the valve seat close to the valve core.

Further, in order to timely detect whether the low-torque self-checking ball-leakage valve leaks, in the medium flowing direction of the medium channel, the medium channel comprises an inlet channel positioned on the upstream side of the valve core and an outlet channel positioned on the downstream side of the valve core;

the low torque self leak-detecting ball valve further includes a leak detection device connected to the body and configured to collect an inlet pressure in the inlet passage and an outlet pressure in the outlet passage to determine whether a leak has occurred based on the inlet pressure and the outlet pressure.

The specific scheme of the leak detection device is further provided, and the leak detection device comprises an inlet sensor, an outlet sensor, a signal collector, a controller and an alarm device; wherein the content of the first and second substances,

the inlet sensor is connected with the inlet channel and is used for detecting the inlet pressure in the inlet channel;

the outlet sensor is connected with the outlet channel and is used for detecting the outlet pressure in the outlet channel;

the input end of the signal collector is respectively connected with the inlet sensor and the outlet sensor, and the output end of the signal collector is connected with the controller, so that the signal collector receives an inlet pressure signal measured by the inlet sensor and an outlet pressure signal measured by the outlet sensor and sends the inlet pressure signal and the outlet pressure signal to the controller;

the controller is in control connection with the alarm device and is used for making a difference between the received inlet pressure signal and the received outlet pressure signal, and when the difference value is smaller than a preset value, the controller controls the alarm device to act to give an alarm.

Further provides a concrete structure of the body, the body comprises a left body and a right body which are in one-to-one correspondence with the valve seats, and a middle valve body assembly connected between the left body and the right body; wherein the content of the first and second substances,

the medium channel sequentially passes through one of the left body, the right body, the middle valve body assembly and the other left body and the right body;

the left body and the right body are provided with assembling grooves for assembling corresponding valve seats, and the valve seats are connected in the assembling grooves in the corresponding left body and the right body in a sliding manner;

the elastic devices are arranged between the corresponding valve seats and the corresponding left and right bodies;

the valve seat driving device is connected to the middle valve body assembly.

After the technical scheme is adopted, the driving motor drives the driving gear to rotate, so as to drive the driven gear and the outer collar to rotate, the outer collar drives the cam assembly to rotate, the cam assembly drives the valve seat pushing member to move, and the valve seat pushing member pushes the valve seat to overcome the elastic force of the elastic device and move in the direction of separating from the valve core, so that the friction force between the valve core and the valve seat is reduced or eliminated, the torque required for rotating the valve core is reduced, and the operation of an operator is facilitated.

The signal collector receives an inlet pressure signal measured by the inlet sensor and an outlet pressure signal measured by the outlet sensor and sends the inlet pressure signal and the outlet pressure signal to the controller; the controller makes a difference between the received inlet pressure signal and the received outlet pressure signal, the flow is in direct proportion to the evolution of the pressure difference according to a known flow-pressure difference characteristic formula, if the leakage condition occurs, the pressure difference becomes small, when the difference value is smaller than a preset value, the leakage can be determined to occur, the controller controls the alarm device to act so as to send out an alarm, whether the ball valve leaks or not can be detected in time, the maintenance is facilitated in time, the economic loss is reduced, and the environmental pollution is reduced.

Drawings

FIG. 1 is a schematic structural view of a low torque self leak detection ball valve of the present invention;

FIG. 2 is a schematic view of the cam assembly of the present invention;

FIG. 3 is a top view of the cam assembly of the present invention;

FIG. 4 is a schematic external structural view of the low torque self leak detection ball valve of the present invention;

fig. 5 is a schematic diagram of the construction of leak detection apparatus of the invention.

Detailed Description

In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.

As shown in fig. 1 to 4, a low torque self-leak-detecting ball valve includes:

a body provided with a medium passage 1;

the valve core 2 is rotatably connected in the medium channel 1 and used for plugging or opening the medium channel 1 in the rotating process, the valve core is a ball body, and a flow hole is formed in the ball body;

two valve seats 3 connected in the medium channel 1 in a sliding manner, wherein two sides of the valve core 2 are respectively provided with one valve seat 3;

the elastic devices correspond to the valve seats 3 one by one and are arranged between the corresponding valve seats 3 and the body, one end parts of the elastic devices are abutted against the body, and the other end parts of the elastic devices are abutted against the corresponding valve seats 3, so that the elastic devices drive the valve seats 3 to be abutted against the valve cores 2;

the valve seat driving device is arranged on the body and connected with the two valve seats 3, and is used for acting to drive the two valve seats 3 to overcome the elastic force of the corresponding elastic devices to move towards the direction of separating from the valve core 2 so as to eliminate or reduce the friction force between the valve seats 3 and the valve core 2, further reduce the torque required by rotating the valve core 2 and facilitate the operation of operators; specifically, the valve seat 3 may be moved in a direction away from the valve element 2 to be away from the valve element 2.

As shown in fig. 1 to 4, the low torque self-checking ball-leakage valve may further include a valve rod 4 connected to an upper end of the valve element 2 and configured to be driven to rotate to drive the valve element 2 to rotate, and the valve seat driving device includes, for example and without limitation, the following structure:

an outer ring 5 rotatably sleeved on the valve rod 4, wherein the outer ring is in sealing connection with the valve rod 4 through a plurality of O-shaped rings;

a cam assembly 6 connected to the outer collar 5;

the valve seat pushing pieces 7 are connected in the body in a sliding mode and correspond to the valve seats 3 one by one, one end portions of the valve seat pushing pieces 7 are abutted against the outer peripheral portions of the corresponding valve seats 3, and the other end portions of the valve seat pushing pieces 7 are abutted against the cam assemblies 6;

the rotary driving device is connected with the outer sleeve ring 5 and is used for driving the outer sleeve ring 5 to rotate so as to drive the cam assembly 6 to rotate, and further driving the valve seat pushing piece 7 to move so as to drive the valve seat 3 to move in a direction of being separated from the valve core 2 against the elastic force of the elastic device; specifically, a handwheel 100 is connected to the upper end of the valve rod 4.

As shown in fig. 1-3, the cam assembly 6 includes, for example but not limited to, the following:

a cam seat 8 connected to the outer collar 5, wherein the outer periphery of the cam seat 8 is provided with two opposite distal end portions 9 and two opposite proximal end portions 10, and the distal end portions 9 and the proximal end portions 10 are arranged at intervals along the circumferential direction of the cam seat 8;

a plurality of rollers 11 distributed along the circumferential direction of the cam seat 8 and rotatably connected to the outer circumferential portion of the cam seat 8, wherein the rollers 11 are used for abutting against the valve seat pushing member 7 during the rotation of the cam seat 8 following the outer collar 5 so as to drive the valve seat pushing member 7 to move; specifically, the cam seat 8 is provided with a key groove and connected with the outer collar 5 through a key, and the roller 11 is rotatably connected to the outer periphery of the cam seat 8 through a pin shaft.

As shown in fig. 1 and 4, the rotary driving device includes, for example and without limitation, the following structure:

a driven gear 12 connected to the outer collar 5;

a driving gear 13 rotatably coupled to the body and engaged with the driven gear 12;

and the driving motor 14 is connected to the body and is connected with the driving gear 13, so that the driving gear 13 is driven by the driving motor 14 to rotate, and the driven gear 12 and the outer collar 5 are driven to rotate.

As shown in fig. 1, the low-torque self-leak-detection ball valve further includes a lower support 15 provided on the body and connected to the lower end portion of the spool 2 to support the lower end portion of the spool 2;

at least one lower sealing ring 16 which is used for abutting against the body to hermetically connect the lower support member 15 and the body is embedded on the peripheral wall of the lower support member 15, and the lower sealing ring 16 can be an O-shaped ring;

the lower support piece 15 is also connected with movable pushing pieces 17 which correspond to the valve seat pushing pieces 7 one by one in a sliding manner;

a moving elastic piece 18 is arranged between the moving pushing piece 17 and the lower support piece 15, one end of the moving elastic piece 18 abuts against the lower support piece 15, and the other end of the moving elastic piece 18 abuts against one end of the moving pushing piece 17, so that the moving elastic piece 18 drives the moving pushing piece 17 to move, and the other end of the moving pushing piece 17 abuts against the corresponding valve seat pushing piece 7 so as to cooperate with the cam assembly 6 to drive the valve seat pushing piece 7 to move. Specifically, the movable elastic element 18 may be a spring, a square hole is formed at the lower end of the valve element 2, the lower support element 15 is connected to the square hole through a sliding bearing, the specific structure of the sliding bearing is the prior art, and details are not repeated in this embodiment.

As shown in fig. 1, the elastic device is, for example, but not limited to, a structure including at least two abutting elastic members 19 distributed along the circumference of the corresponding valve seat 3 and connected between the corresponding valve seat 3 and the body, one end of each abutting elastic member 19 abuts against the corresponding valve seat 3, and the other end of each abutting elastic member 19 abuts against the body, so that all the abutting elastic members 19 jointly drive the corresponding valve seat 3 to abut against the valve core 2; in this embodiment, there may be 4 abutting elastic members 19, and the abutting elastic members 19 may be springs.

As shown in fig. 1, a side seal ring for abutting against a channel wall of the medium channel 1 to hermetically connect the valve seat 3 and the body may be fitted on an outer peripheral wall of the valve seat 3;

an end portion of the valve seat 3 close to the valve element 2 may be fitted with an end portion seal ring 20 for abutting against the valve element 2 to sealingly connect the valve seat 3 and the valve element 2.

As shown in fig. 1, 4, 5, in the medium flow direction in the medium passage 1, the medium passage 1 includes an inlet passage 21 on the upstream side of the spool 2 and an outlet passage 22 on the downstream side of the spool 2;

the low torque self leak-detecting ball valve further includes leak detection means connected to the body for collecting an inlet pressure in the inlet passage 21 and an outlet pressure in the outlet passage 22 to determine whether a leak has occurred based on the inlet pressure and the outlet pressure.

As shown in fig. 1, 4 and 5, the leak detection apparatus is constructed, for example and without limitation, to include an inlet sensor 23, an outlet sensor 24, a signal collector 25, a controller 26 and an alarm device 27; wherein the content of the first and second substances,

the inlet sensor 23 is connected to the inlet channel 21 and is configured to detect an inlet pressure in the inlet channel 21;

the outlet sensor 24 is connected to the outlet passage 22 and is configured to detect an outlet pressure in the outlet passage 22;

the input end of the signal collector 25 is connected to the inlet sensor 23 and the outlet sensor 24, respectively, and the output end of the signal collector 25 is connected to the controller 26, so that the signal collector 25 receives an inlet pressure signal measured by the inlet sensor 23 and an outlet pressure signal measured by the outlet sensor 24, and sends the inlet pressure signal and the outlet pressure signal to the controller 26;

the controller 26 is in control connection with the alarm device 27, and the controller 26 is configured to make a difference between the received inlet pressure signal and the received outlet pressure signal, and when the difference is smaller than a preset value, the controller 26 controls the alarm device 27 to act to send an alarm. Specifically, according to a known flow-pressure difference characteristic formula, the flow rate is proportional to the evolution of the pressure difference, if a leakage occurs, the pressure difference becomes smaller, and when the difference is smaller than a preset value, the leakage can be determined. In this embodiment, the signal collector 25, the controller 26 and the alarm device 27 are integrated in the detection device 200, and the controller 26 is a prior art known to those skilled in the art, and will not be described in detail in this embodiment.

As shown in fig. 1 and 4, the body is, for example and without limitation, a structure including two left and right bodies 28 corresponding to the valve seat 3 one by one, and a middle valve body assembly connected between the two left and right bodies 28; wherein the content of the first and second substances,

the medium channel 1 sequentially passes through one of the left and right bodies 28, the middle valve body assembly and the other left and right bodies 28;

the left body 28 and the right body 28 are provided with assembling grooves for assembling corresponding valve seats 3, and the valve seats 3 are connected in the assembling grooves in the corresponding left body 28 and the right body 28 in a sliding way;

the elastic device is arranged between the corresponding valve seat 3 and the corresponding left and right bodies 28;

the valve seat driving device is connected to the middle valve body assembly; specifically, the inlet sensor 23 is mounted on one of the left and right bodies 28, and the outlet sensor 24 is mounted on the other of the left and right bodies 28.

In this embodiment, the valve body assembly may include:

the middle valve body 29, and the left and right bodies 28 are connected to the middle valve body 29;

a lower valve cap 30 connected to a lower end portion of the middle valve body 29, the lower supporter 15 being connected to the lower valve cap 30;

an upper valve cover 31 connected to an upper end of the middle valve body 29;

an upper support member 32 connected to the upper valve cover 31, wherein the inner peripheral wall of the upper support member 32 is in sealed connection with the outer peripheral wall of the outer collar 5 through at least one O-ring, and the outer peripheral wall of the upper support member 32 is in sealed connection with the inner peripheral wall of the upper valve cover 31 through at least one O-ring;

a gear housing 33 connected to the upper support 32, wherein the driving gear 13 and the driven gear 12 are both located in the gear housing 33, and the driving gear 13 is rotatably connected to the gear housing 33;

a motor support 34 connected to the gear housing 33, wherein the driving motor 14 is mounted on the motor support 34, and a motor cover for covering the driving motor 14 is further mounted on the motor support 34;

a supporting plate 35 connected between the gear housing 33 and the upper supporting frame, and the detecting device 200 is connected on the supporting plate 35.

The working principle of the invention is as follows:

the driving motor 14 drives the driving gear 13 to rotate, so as to drive the driven gear 12 and the outer collar 5 to rotate, and drive the cam assembly 6 to rotate through the outer collar 5, the cam assembly 6 drives the valve seat pushing member 7 to move, and the valve seat pushing member 7 pushes the valve seat 3 to move in a direction of being separated from the valve core 2 by overcoming the elastic force of the elastic device, so as to reduce or eliminate the friction force between the valve core 2 and the valve seat 3, reduce the torque required for rotating the valve core 2, and facilitate the operation of an operator.

The inlet sensor 23 detects inlet pressure in the inlet channel 21, the outlet sensor 24 detects outlet pressure in the outlet channel 22, and the signal collector 25 receives an inlet pressure signal measured by the inlet sensor 23 and an outlet pressure signal measured by the outlet sensor 24, and sends the inlet pressure signal and the outlet pressure signal to the controller 26; the controller 26 makes a difference between the received inlet pressure signal and the received outlet pressure signal, the flow rate is in direct proportion to the evolution of the pressure difference according to a known flow rate-pressure difference characteristic formula, if the leakage condition occurs, the pressure difference becomes small, when the difference value is smaller than a preset value, the leakage can be determined to occur, the controller 26 controls the alarm device 27 to act so as to send out an alarm, whether the ball valve leaks or not can be detected in time, the maintenance is facilitated in time, the economic loss is reduced, and the environmental pollution is reduced.

The above embodiments are described in further detail to solve the technical problems, technical solutions and advantages of the present invention, and it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms indicating an orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the present invention, unless otherwise expressly stated or limited, the first feature may be present on or under the second feature in direct contact with the first and second feature, or may be present in the first and second feature not in direct contact but in contact with another feature between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.