阅读说明：本技术 调速装置以及速度控制系统 (Speed adjusting device and speed control system ) 是由 王志辉 叶庆红 张建新 纪洪彬 于 2019-03-27 设计创作，主要内容包括：本发明揭示调速装置以及速度控制系统,用于调节管道的内检测器或者清管器的移动速度。所述调速装置包括：执行腔,所述执行腔包括泄流口,所述溢流口设置于所述执行腔的侧壁上；旁通阀,所述旁通阀设置于所述执行腔内,且可沿所述执行腔的轴向方向移动以打开或关闭所述泄流口；旁通阀执行机构,所述旁通阀执行机构连接所述旁通阀,并控制所述旁通阀沿所述执行腔的轴向方向移动以打开或关闭所述泄流口。该调速装置以及速度控制系统中,其旁通阀的运行阻力小,泄流面积大,使用较为广泛。(The invention discloses a speed regulating device and a speed control system, which are used for regulating the moving speed of an inner detector or a pipe cleaner of a pipeline. The speed adjusting device comprises: the execution cavity comprises a discharge port, and the overflow port is arranged on the side wall of the execution cavity; a bypass valve provided in the actuation chamber and movable in an axial direction of the actuation chamber to open or close the bleed port; a bypass valve actuator connected to the bypass valve and controlling the bypass valve to move in an axial direction of the actuator chamber to open or close the bleed port. In the speed regulating device and the speed control system, the bypass valve has small running resistance, large flow discharge area and wide application.)

1. A governor device for regulating the speed of movement of an inner detector or pig of a pipeline, the governor device comprising:

the execution cavity comprises a discharge port, and the overflow port is arranged on the side wall of the execution cavity;

a bypass valve provided in the actuation chamber and movable in an axial direction of the actuation chamber to open or close the bleed port;

a bypass valve actuator connected to the bypass valve and controlling the bypass valve to move in an axial direction of the actuator chamber to open or close the bleed port.

2. The governor device of claim 1, wherein the bypass valve includes an annular flap that abuts an inner wall of the actuation chamber and covers the overflow opening when the bypass valve is moved to close the overflow opening.

3. The governor device of claim 2, further comprising a speed control unit that controls the bypass valve actuator to drive movement of the bypass valve based on the sensed real-time speed;

when the detected real-time speed is lower than a first threshold speed, controlling the bypass valve actuating mechanism to drive the bypass valve to move towards the direction of closing the overflow port so as to reduce the opening of the bypass valve;

and when the detected real-time speed is greater than a second threshold speed, controlling the bypass valve actuating mechanism to drive the bypass valve to move towards the direction of opening the overflow port so as to increase the opening of the bypass valve, wherein the second threshold speed is greater than the first threshold speed.

4. The governor of claim 3, further comprising a limit detection unit disposed within the actuation chamber and detecting an opening of the bypass valve.

5. The governor according to claim 4, wherein the speed control unit receives information on the opening degree of the bypass valve detected by the limit detection unit;

when the opening information received by the speed control unit is that the opening of the bypass valve is 100%, and the detected real-time speed is greater than a second threshold value, the speed control unit sends an instruction for stopping driving the bypass valve to the bypass valve actuating mechanism;

and when the opening information received by the speed control unit indicates that the opening of the bypass valve is 0 and the detected real-time speed is less than a first threshold value, the speed control unit sends an instruction for stopping driving the bypass valve to the bypass valve actuating mechanism.

6. The speed regulating device according to claim 4, wherein the limit detecting unit comprises:

a position sensor rod disposed within the actuation cavity along an axial direction of the actuation cavity;

the first limit measuring device is arranged on the position sensor rod, is correspondingly positioned at the maximum opening position of the bypass valve, and outputs a corresponding level according to the distance between the first limit measuring device and the bypass valve; and

the second limit measuring device is arranged on the position sensor rod, is correspondingly positioned at the minimum opening position of the bypass valve, and outputs a corresponding level according to the distance between the second limit measuring device and the bypass valve;

the speed control unit judges the opening and closing state of the bypass valve by detecting the level output by the first limit measuring device and the second limit measuring device.

7. A governor device according to claim 3, characterised in that the bypass valve actuator comprises:

the micro hydraulic station is connected with the speed control unit and controls the oil flow direction of the micro hydraulic station by the speed control unit;

the double hydraulic oil pipes are connected with the micro hydraulic station;

the bidirectional hydraulic cylinder is connected to the micro hydraulic station through the double hydraulic oil pipes and comprises a telescopic end, the telescopic end is connected with the bypass valve and can be stretched and contracted along the axial direction of the execution cavity under the control of the micro hydraulic station so as to drive the bypass valve to move along the axial direction of the execution cavity.

8. The governor device of claim 7, wherein the bypass valve further comprises a support plate to which the retractable end of the bi-directional hydraulic cylinder is connected to drive the bypass valve to move in the axial direction of the actuation chamber.

9. The governor of claim 7, further comprising a power unit and a power chamber fixed to one of both ends of the actuation chamber in an axial direction thereof, wherein the speed control unit, the power unit, and the micro hydraulic station are disposed in the power chamber; the bidirectional hydraulic cylinder is arranged in the execution cavity and is fixed at one end of the execution cavity close to the power cavity; the double-hydraulic oil pipe is arranged between the execution cavity and the power cavity, one end of the double-hydraulic oil pipe extends into the execution cavity and is connected with the two-way hydraulic cylinder, and the other end of the double-hydraulic oil pipe extends into the power cavity and is connected with the micro hydraulic station.

10. The governor of claim 1, further comprising an inlet port disposed in a side wall of the actuation chamber.

11. A speed control system, characterized in that the speed control system comprises a governor device according to any one of claims 1-11.

12. The speed control system of claim 11, further comprising a speed measuring device coupled to the governor device for detecting a real-time speed of an inner detector of the pipeline or the pig.

13. The speed control system of claim 11, further comprising a status display unit coupled to the governor device for displaying a status of the speed adjustment.

Technical Field

The invention relates to a speed regulating device and a speed control system with the same.

Background

At present, the leakage flux internal detector for the pipeline has a relatively proper detection speed of 0-5m/s in the pipeline, and the optimal detection speed is about 2 m/s. The medium speed of many oil and gas pipelines is far higher than the medium speed, so that the speed of the detector in the leakage flux needs to be controlled to a certain degree.

The current market uses speed adjusting devices which are divided into mechanical type and electronic type, and the speed adjusting devices mainly have three problems: 1) the mechanical speed regulating device does not know how to calculate and select the spring for equipment operators and the target speed of the speed regulating equipment, so that the mechanical speed regulating device is not beneficial to popularization; 2) the mechanical speed regulating device does not have self-adaptive capacity and is difficult to adapt to various parameter changes in the running process of the pipeline; 3) the electronic speed regulating device adopts a method of measuring the magnetic field intensity by a sensor to calculate the opening size of the speed regulating valve, but is interfered by a strong magnetic field in the magnetic flux leakage detector, so that the electronic speed regulating device cannot be reliably used in the magnetic flux leakage detector; 4) the structure of a speed regulating valve (bypass valve) in the existing mechanical or electronic speed regulating device is complex, the dischargeable area is small, and the application range is limited.

Disclosure of Invention

In view of the defects in the prior art, the invention aims to provide a speed regulating device for regulating the moving speed of an inner detector or a pipe cleaner of a pipeline and a speed control system with the speed regulating device. In the speed regulating device and the speed control system, the bypass valve has small running resistance, large flow discharge area and wider application range.

According to an aspect of the present disclosure, there is provided a governor device for regulating a moving speed of an inner detector or a pig of a pipeline, the governor device including: the execution cavity comprises a discharge port, and the overflow port is arranged on the side wall of the execution cavity; a bypass valve provided in the actuation chamber and movable in an axial direction of the actuation chamber to open or close the bleed port; a bypass valve actuator connected to the bypass valve and controlling the bypass valve to move in an axial direction of the actuator chamber to open or close the bleed port.

In a governor device according to an aspect of the present disclosure, the bypass valve includes an annular flap that abuts against an inner wall of the actuation chamber and covers the overflow port when the bypass valve is moved to close the overflow port.

In the speed regulation device according to one aspect of the present disclosure, the speed regulation device further includes a speed control unit that controls the bypass valve actuator to drive movement of the bypass valve according to the detected real-time speed; when the detected real-time speed is lower than a first threshold speed, controlling the bypass valve actuating mechanism to drive the bypass valve to move towards the direction of closing the overflow port so as to reduce the opening of the bypass valve; and when the detected real-time speed is greater than a second threshold speed, controlling the bypass valve actuating mechanism to drive the bypass valve to move towards the direction of opening the overflow port so as to increase the opening of the bypass valve, wherein the second threshold speed is greater than the first threshold speed.

In a speed adjusting device according to an aspect of the present disclosure, the speed adjusting device further includes a limit detection unit that is provided in the execution chamber and detects an opening degree of the bypass valve.

In the speed adjusting device according to one aspect of the present disclosure, the speed control unit receives the opening degree information of the bypass valve detected by the limit detection unit; when the opening information received by the speed control unit is that the opening of the bypass valve is 100%, and the detected real-time speed is greater than a second threshold value, the speed control unit sends an instruction for stopping driving the bypass valve to the bypass valve actuating mechanism; and when the opening information received by the speed control unit indicates that the opening of the bypass valve is 0 and the detected real-time speed is less than a first threshold value, the speed control unit sends an instruction for stopping driving the bypass valve to the bypass valve actuating mechanism.

In a speed adjusting apparatus according to an aspect of the present disclosure, the limit detecting unit includes: a position sensor rod disposed within the actuation cavity along an axial direction of the actuation cavity; the first limit measuring device is arranged on the position sensor rod, is correspondingly positioned at the maximum opening position of the bypass valve, and outputs a corresponding level according to the distance between the first limit measuring device and the bypass valve; the second limit measuring device is arranged on the position sensor rod, is correspondingly positioned at the minimum opening position of the bypass valve, and outputs a corresponding level according to the distance between the second limit measuring device and the bypass valve; the speed control unit controls the on-off state of the bypass valve by detecting the level output by the first limit measuring device and the second limit measuring device.

In a speed adjusting device according to an aspect of the present disclosure, the bypass valve actuator includes: the micro hydraulic station is connected with the speed control unit and controls the oil flow direction of the micro hydraulic station by the speed control unit; the double hydraulic oil pipes are connected with the micro hydraulic station; the bidirectional hydraulic cylinder is connected to the micro hydraulic station through the double hydraulic oil pipes and comprises a telescopic end, the telescopic end is connected with the bypass valve and can be stretched and contracted along the axial direction of the execution cavity under the control of the micro hydraulic station so as to drive the bypass valve to move along the axial direction of the execution cavity.

In the governor device according to an aspect of the present disclosure, the bypass valve further includes a support plate to which a telescopic end of the bidirectional hydraulic cylinder is connected to drive the bypass valve to move in an axial direction of the actuation chamber.

In a speed adjusting device according to an aspect of the present disclosure, the speed adjusting device further includes a power unit and a power cavity, the power cavity is fixed to one of two ends of the execution cavity in an axial direction thereof, wherein the speed control unit, the power unit, and the micro hydraulic station are all disposed in the power cavity; the bidirectional hydraulic cylinder is arranged in the execution cavity and is fixed at one end of the execution cavity close to the power cavity; the double-hydraulic oil pipe is arranged between the execution cavity and the power cavity, one end of the double-hydraulic oil pipe extends into the execution cavity and is connected with the two-way hydraulic cylinder, and the other end of the double-hydraulic oil pipe extends into the power cavity and is connected with the micro hydraulic station.

In a governor device according to an aspect of the present disclosure, the governor device further includes a flow inlet provided on a side wall of the execution chamber.

According to another aspect of the present disclosure, there is also provided a speed control system including the above speed regulating device.

In a speed control system according to another aspect of the present disclosure, the speed control system further comprises a speed measuring device connected to the speed regulating device for detecting a real-time speed of an inner detector of the pipeline or the pipe cleaner.

In a speed control system according to another aspect of the present disclosure, the speed control system further includes a status display unit connected to the speed adjusting device for displaying a status of speed adjustment.

Compared with the prior art, in the speed regulating device and the speed control system with the speed regulating device provided by the embodiment of the invention, the overflow port is arranged on the side wall of the execution cavity of the speed regulating device, and the bypass valve can move (namely, the design of linear traveling) along the axial direction of the execution cavity to open or close the drain port. In addition, by arranging the speed control unit, the speed control unit judges (detects double-limit) according to the real-time speed and the opening information of the bypass valve to control the bypass valve actuating mechanism, so that the bypass valve actuating unit is in a 'rest' state under most conditions, the electric energy is saved, and compared with the prior art, the speed control unit is more reliable in setting after the opening of the bypass valve is calculated according to the magnetic field intensity, therefore, the speed control unit has low requirement on users, improves the self-adaptive capacity of the speed regulating device, and has a larger speed regulating range.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

fig. 1 is a schematic sectional structure view showing a governor according to an embodiment of the present invention; and

fig. 2 is a schematic configuration diagram showing a speed control system of an embodiment of the present invention.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted.

The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In some instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring the invention.

According to the gist of the present invention, the speed adjusting device of the present invention includes: the execution cavity comprises a discharge port, and the overflow port is arranged on the side wall of the execution cavity; a bypass valve provided in the actuation chamber and movable in an axial direction of the actuation chamber to open or close the bleed port; a bypass valve actuator connected to the bypass valve and controlling the bypass valve to move in an axial direction of the actuator chamber to open or close the bleed port.

The technical contents of the present invention will be further described with reference to the accompanying drawings and examples.

Referring to fig. 1, a schematic cross-sectional structure diagram of a governor device according to an embodiment of the present invention is shown. It should be noted that the speed regulating device of the present invention is mainly used for regulating the moving speed of the inner detector or the cleaning pig of the pipeline. In a preferred embodiment of the invention, the governor device mainly comprises an actuating chamber, a bypass valve and a bypass valve actuating mechanism.

In particular, in the embodiment shown in fig. 1 the actuation chamber 1 extends in the transverse direction (left-right direction) in fig. 1, having a cylindrical side wall, wherein the axial direction of the actuation chamber 1 is also the transverse direction (left-right direction) in fig. 1, the actuation chamber 1 comprises a discharge opening 11, the discharge opening 11 being provided in the side wall of the actuation chamber 1, in an alternative embodiment of the invention the discharge opening 11 may be an annular opening, i.e. surrounding the side wall of the actuation chamber 1 as shown in fig. 1, further, in an embodiment of the invention, the size of the discharge opening is preferably 3.14 × d × L, wherein d represents the inner diameter of the actuation chamber 1 of the governor device, determined according to the inner detector or pig gauge of the pipeline, L represents the stroke of the hydraulic cylinder, in the known governor device the baffle and discharge opening of the governor valve are provided directly in front, having a maximum discharge area of 1/2 × 3.14.14 3.14 × (d/2)²In contrast, in the speed regulating device of the present invention, when the bypass valve is set to L/8, the same leakage area can be achieved, and the problems of increased resistance, reduced reliability of the rotating bearing, and the like caused by the fact that the baffle and the leakage port of the speed regulating valve are arranged right in front in the prior art do not occur.

In an alternative embodiment of the invention, the governor device further comprises an inlet 12. The inlet 12 is likewise arranged on the side wall 10 of the actuating chamber 1. In the embodiment shown in fig. 1, the inlet 12 is located to the right of the overflow 11. During the movement of the governor device in its axial direction (left-right direction in fig. 1), the fluid enters the actuation chamber 1 from the inlet 12 and flows out from the overflow 11.

The bypass valve 2 is provided in the actuation chamber 1, and is movable in the axial direction of the actuation chamber 1 to open or close the drain port 11. In the embodiment shown in fig. 1, the bypass valve 2 comprises an annular baffle 21 and a support plate 22. The annular flap 21 abuts against the inner wall of the actuation chamber 1 (inner surface of the side wall 10) and the annular flap 21 covers the overflow 11 when the bypass valve 2 is moved to close the overflow 11. More specifically, as shown in fig. 1, when the annular baffle 21 moves in the direction from left to right in fig. 1, the opening area of the overflow port 11 gradually decreases, that is, the opening degree of the bypass valve 2 decreases; further, when the annular flap 21 completely covers the overflow port 11 from left to right, the bypass valve 2 closes the overflow port 11. In contrast, when the annular baffle 21 is moved in the direction from right to left in fig. 1, the opening area of the overflow port 11 gradually increases, that is, the opening degree of the bypass valve 2 increases. The support plate 22 is attached inside the annular baffle 21.

The bypass valve actuator is connected to the bypass valve 2 and controls the bypass valve to move in the axial direction of the actuator chamber 1 to open or close the bleed port 11.

Specifically, in the embodiment shown in FIG. 1, the bypass valve actuator includes: a bidirectional hydraulic cylinder 61, a double hydraulic oil pipe 62 and a micro hydraulic station 63. The micro hydraulic station 63 may be any one of the existing micro hydraulic stations, and is generally composed of a motor (capable of rotating forward and backward), an oil pump, a safety valve, and the like. The micro hydraulic station 63 is connected to the speed control unit 3 (see below) and its oil flow direction is controlled by said speed control unit. The double hydraulic oil pipe 62 is connected with a micro hydraulic station 63, and the micro hydraulic station 63 transmits power to the bidirectional hydraulic cylinder 61 through the double hydraulic oil pipe 62. The bi-directional hydraulic cylinder 61 is connected to a micro hydraulic station 63 by a double hydraulic oil line 62. Wherein the bi-directional hydraulic cylinder 61 includes a telescopic end (left end in fig. 1). The telescopic end is connected with the bypass valve 2 and can be stretched and contracted along the axial direction of the execution chamber 1 under the control of the micro hydraulic station 63 so as to drive the bypass valve 2 to move along the axial direction of the execution chamber 1. More specifically, as shown in fig. 1, the telescopic end of the bidirectional hydraulic cylinder 61 is fixedly connected to the support plate 22 of the bypass valve 2, the speed control unit 3 controls the forward rotation or reverse rotation of the motor in the micro hydraulic station 63, so that the forward rotation or reverse rotation of the motor in the micro hydraulic station 63 can change the direction of the oil flow inside the micro hydraulic station 63, and further can drive the telescopic end of the bidirectional hydraulic cylinder 61 to extend or retract along the axial direction of the actuation cavity 1 (for example, the motor extends in the forward rotation or retracts in the reverse rotation), and further, the telescopic end drives the whole bypass valve 2 (including the annular baffle 21) to move through the support plate 22, thereby realizing the opening control of the bypass valve 2.

Further, in the embodiment of the present invention, the speed regulating device further includes a speed control unit 3. Alternatively, the speed control unit 3 may be composed of a single chip microcomputer (MCU chip). The speed control unit 3 controls the bypass valve actuator to drive the movement of the bypass valve 2 in accordance with the sensed real-time speed (which may be sensed by a speed sensing device, see below). Specifically, the speed control unit 3 determines, according to the real-time speed obtained by the detection, specifically:

when the detected real-time speed is less than the first threshold speed, the bypass valve actuator is controlled to drive the bypass valve 2 to move in a direction to close the overflow port 11 (i.e., in a direction from left to right in fig. 1), so as to reduce the opening of the bypass valve 2 and increase the moving speed of the inner detector or the pig of the pipeline.

When the detected real-time speed is greater than the second threshold speed, the bypass valve actuator is controlled to drive the bypass valve 2 to move in a direction to open the overflow port 11 (i.e., in a direction from right to left in fig. 1) so as to increase the opening of the bypass valve 2 and reduce the moving speed of the inner detector or the pig of the pipeline. Wherein the second threshold speed is greater than the first threshold speed.

In an alternative embodiment of the present invention, the first threshold speed and the second threshold speed may be set according to a reference speed. The reference speed may be the optimum speed of movement of the inner probe or pig of the pipeline when the speed control unit 3 controls the bypass valve actuator to move it to drive the bypass valve 2 until the speed of movement of the inner probe or pig of the pipeline reaches the reference speed. For example, the first threshold speed may be 10% below the reference speed and the second threshold speed may be 10% above the reference speed. The reference speed may be, for example, an optimum moving speed 2m/s as described in the background. In the case that the reference speed is 2m/s, the first threshold speed may be, for example, 1.8m/s, and the second threshold speed may be 2.2m/s, which is not described herein again.

Further, in the embodiment shown in fig. 1, the speed adjusting device further includes a limit detection unit. The limit detection unit is arranged in the execution cavity 1 and detects the opening degree of the bypass valve 2. Wherein, the speed control unit 3 also receives the opening information of the bypass valve 2 detected by the limit detection unit.

Furthermore, the real-time speed obtained by detection and the opening information of the bypass valve 2 are combined for judgment, specifically:

when the opening degree information received by the speed control unit 3 is that the opening degree of the bypass valve 2 is 100%, and the detected real-time speed is greater than the second threshold value, the speed control unit 3 issues an instruction to stop driving the bypass valve 2 to the bypass valve actuator. In this state, since the opening degree of the bypass valve 2 is 100%, that is, the opening area of the overflow port 11 is maximized, even if the bypass valve actuator is continuously controlled, the speed of the inner detector or the pig of the pipe cannot be further reduced, and in this case, the bypass valve actuator stops driving the bypass valve 2, in other words, the bypass valve actuator is in a "rest" state, and electric power is saved.

Similarly, when the opening degree information received by the speed control unit 3 is that the opening degree of the bypass valve 2 is 0, and the detected real-time speed is less than the first threshold value, the speed control unit 3 issues an instruction to stop driving the bypass valve 2 to the bypass valve actuator. In this state, since the opening degree of the bypass valve 2 is 0, that is, the opening area of the overflow port 11 is the smallest, even if the bypass valve actuator is continuously controlled, the speed of the inner detector or the pig of the pipe cannot be further increased, and in this case, the bypass valve actuator stops driving the bypass valve 2, in other words, the bypass valve actuator is in the "rest" state, and electric power is saved.

In the embodiment of the invention, because the speed regulating device is often in a strong magnetic environment detected in leakage magnetic in a pipeline and the problem that the bypass valve is easily interfered by a strong magnetic field in a mode of calculating the opening size of the bypass valve by measuring the magnetic field intensity is avoided, the limit detection unit is adopted, the speed control unit judges according to the real-time speed and the opening information of the bypass valve, the calculated analog quantity is simplified into the switching value, and compared with the prior art that the setting is more reliable after the opening of the bypass valve is calculated only according to the magnetic field, the control of the bypass valve is better realized.

Specifically, in the embodiment shown in fig. 1, the limit detection unit includes a position sensor lever 41, a first limit measurement device 42, and a second limit measurement device 43. Wherein the position sensor rod 41 is arranged in the actuation chamber 1 in the axial direction of the actuation chamber 1. The first limit measuring device 42 is provided on the position sensor lever 41, corresponds to the maximum opening position of the bypass valve 2, and outputs a corresponding level according to the distance from the bypass valve 2. The second limit measuring device 43 is provided on the position sensor lever 41 so as to be located at the minimum opening position of the bypass valve 2, and outputs a corresponding level according to the distance from the bypass valve 2. The speed control unit 3 determines the open/close state of the bypass valve 2 by detecting the levels output from the first limit measuring device 42 and the second limit measuring device 43. More specifically, in one embodiment of the present invention, a permanent magnet may be disposed on the support plate 22 of the bypass valve 2, and both the first limit measurement device 42 and the second limit measurement device 43 may be sensors. When the permanent magnet is positioned at the position closest to the sensor in the moving process of the permanent magnet, the sensor outputs a first level through a comparator of the sensor; when the permanent magnet is far away from the sensor, the sensor outputs a second level (the second level may be less than the first level) through the comparator, and the speed control unit 3 judges the current switch state of the bypass valve 2 through the levels output by the first limit measuring device 42 and the second limit measuring device 43. For example, when the permanent magnet of the bypass valve 2 is located at the position closest to the sensor as the first limit measurement device 42, the first limit measurement device 42 outputs a high level, and at this time, the speed control unit 3 may determine that the bypass valve 2 is in the state of maximum opening degree according to the high level output by the first limit measurement device 42; when the permanent magnet of the bypass valve 2 is far away from the sensor serving as the first limit measuring device 42, the first limit measuring device 42 outputs a low level, and at this time, the speed control unit 3 may determine that the bypass valve 2 is in a state where the opening degree is reduced according to the low level output by the first limit measuring device 42; when the permanent magnet of the bypass valve 2 is located at the position closest to the sensor as the second limit measuring device 43, the second limit measuring device 43 outputs a high level (which may be different from the low level output by the first limit measuring device 42), and at this time, the speed control unit 3 may judge that the bypass valve 2 is in the state of minimum opening degree according to the high level output by the second limit measuring device 43; when the permanent magnet of the bypass valve 2 is distant from the sensor as the second limit measuring device 43, the second limit measuring device 43 outputs a low level (may be different from the low level output by the second limit measuring device 43), and at this time, the speed control unit 3 may judge that the bypass valve 2 is in a state in which the opening degree is increased, based on the low level output by the second limit measuring device 43.

Further, in the embodiment shown in fig. 1, the governor device further includes a power chamber 5 and a power unit 7. The power chamber 5 is fixed to one of both ends of the actuation chamber 1 in the axial direction thereof (the right end portion of the actuation chamber 1 in fig. 1). Alternatively, the power unit 7 is a battery or a battery pack. The speed control unit 3, the power unit 7 and the micro hydraulic station 63 are all arranged in the power chamber 5. The bidirectional hydraulic cylinder 61 is disposed in the actuation chamber 1, and is fixed to an end (i.e., the right end in fig. 1) of the actuation chamber 1 near the power chamber 5. The double hydraulic oil pipe 62 is arranged between the execution cavity 1 and the power cavity 5, one end of the double hydraulic oil pipe extends into the execution cavity 1 to be connected with the bidirectional hydraulic cylinder 61, and the other end of the double hydraulic oil pipe extends into the power cavity 5 to be connected with the micro hydraulic station 63. In the embodiment of the invention, because the speed control unit 3, the power unit 7 and the micro hydraulic station 63 are all arranged in the power cavity 5, the related electrical components (such as a motor, a battery and the like of the micro hydraulic station 63) are prevented from directly contacting the medium in the pipeline, and the reliability is improved.

Further, please refer to fig. 2, which respectively shows a schematic structural diagram of a speed control system according to an embodiment of the present invention. Specifically, the invention also provides a speed control system. The speed control system includes the governor device of fig. 1 described above.

Further, in the embodiment shown in fig. 2, the speed control system further comprises a speed measuring device. The speed measuring device is connected with the speed regulating device in the figure 1 and is used for detecting the real-time speed of the inner detector or the pipe cleaner of the pipeline. Referring to fig. 1, in an embodiment of the present invention, an interface unit is further disposed at an end (a right end in fig. 1) of the power cavity 5 away from the actuating cavity 1, and the interface unit is used for debugging, charging, switching on and off the speed regulating device, and enabling connection with components such as a speed measuring device and a status display unit (see below). The speed measuring device can be connected with the speed regulating device through an analog-to-digital conversion circuit, and can be any speed measuring device in an existing inner detector or pipe cleaner for a pipeline, which is not described herein again.

Further, in the embodiment shown in fig. 2, the speed control system further comprises a status display unit. The state display unit is connected with the speed regulating device and used for displaying the state of speed regulation. For example, the state display unit may display the following states:

1. when the speed is lower than the reference speed, displaying that the bypass valve is closed;

2. when the speed is lower than the reference speed and the opening of the bypass valve is 0, displaying that the executing mechanism has a rest;

3. when the speed is higher than the reference speed, displaying the opening process of the bypass valve;

4. when the speed is higher than the reference speed and the opening of the bypass valve is 100%, the actuator is displayed as "resting".

In summary, in the speed adjusting device and the speed control system having the speed adjusting device provided in the embodiments of the present invention, the overflow port is disposed on the side wall of the actuating chamber of the speed adjusting device, and the bypass valve can move along the axial direction of the actuating chamber (i.e. adopting a "linear travel" design) to open or close the drain port. In addition, by arranging the speed control unit, the speed control unit judges (detects double-limit) according to the real-time speed and the opening information of the bypass valve to control the bypass valve actuating mechanism, so that the bypass valve actuating unit is in a 'rest' state under most conditions, the electric energy is saved, and compared with the prior art, the speed control unit is more reliable in setting after the opening of the bypass valve is calculated only according to the magnetic field, therefore, the speed control unit has low requirement on users, improves the self-adaptive capacity of the speed regulating device, and has a larger speed regulating range.

Although the invention has been described with respect to alternative embodiments, it is not intended to be limited thereto. Various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention is subject to the scope defined by the claims.