High-pressure bypass driving device

Abstract

The utility model discloses a high-pressure bypass driving device which comprises a high-pressure bypass regulating valve and an electric actuator in transmission connection with the high-pressure bypass regulating valve, and a control unit in control connection with the electric actuator is arranged on the electric actuator. The electric actuator is provided with at least one output shaft used for being in transmission connection with the high-pressure bypass regulating valve, the electric actuator is further provided with at least one input shaft, and the input shaft is provided with a hand wheel and a speed change mechanism which are in transmission fit with the input shaft. The electric actuator can be driven through the hand wheel under emergency conditions, the speed change mechanism is arranged to be matched with the hand wheel in order to cope with various different load conditions, so that the transmission ratio of the hand wheel is adjusted, the proper transmission ratio can be selected according to actual conditions during use, and driving is more convenient.

Description

Technical Field

[0001] This utility model relates to the technical field of high-voltage bypass, and in particular to the technical field of high-voltage bypass drive devices. Background Technology

[0002] In the operation system of thermal power plants, high-pressure bypass regulating valves are one of the key pieces of equipment to ensure the stable and safe operation of the units. During normal operation, the high-pressure bypass system functions as a regulator; however, in case of accidents or abnormalities, it must react quickly, performing rapid opening and closing actions to ensure unit safety. However, the original high-pressure bypass regulating valves used FTSMARTpositioner pneumatic positioners. With the increase in unit operating time and the increasing complexity of operating conditions, this actuation method has gradually revealed many drawbacks: 1. Insufficient compatibility: After upgrading the valve body (such as adding a pre-opening valve), the pneumatic system is difficult to adapt, leading to control failure; 2. Complex maintenance: Commissioning requires specialized software, and spare parts procurement cycles are long and costly; 3. Safety hazards: In case of failure, the valve cannot open quickly, prolonging the unit's grid connection time, and the large on-site vibration increases the maintenance risk; 4. Data gaps: There is no operational data recording function, and fault diagnosis relies on manual experience. Therefore, some high-pressure bypass valves are replaced with electric actuators to drive the high-pressure bypass regulating valves. The problem with existing electric actuators is that, in order to cope with power failure, they are mostly equipped with large handwheels for manual operation. However, the problem with existing handwheels is that they are not adjustable, and the transmission ratio of the handwheel cannot be adjusted according to the load and speed requirements to meet various needs. Summary of the Invention

[0003] The purpose of this invention is to solve the problems in the prior art and to propose a high-voltage bypass drive device that can adjust the handwheel transmission ratio according to the actual situation to meet various emergency drive needs.

[0004] To achieve the above objectives, this utility model proposes a high-pressure bypass drive device, including a high-pressure bypass regulating valve and an electric actuator that is drivenly connected to the high-pressure bypass regulating valve. The electric actuator is provided with a control unit that is controlled and connected to the electric actuator. The electric actuator is provided with at least one output shaft for driving connection with the high-pressure bypass regulating valve. The electric actuator is also provided with at least one input shaft. The input shaft is provided with a handwheel and a speed-changing mechanism that drively cooperate with it. The speed-changing mechanism includes a main gear sleeved on the input shaft and several secondary gears arranged around the outer circumference of the main gear and meshing with the main gear. The secondary gears are rotatably mounted on the electric actuator, and each secondary gear has a different outer diameter. The handwheel has a wheel axle at its center, and the end of the wheel axle has an insertion limiting part. The center of the secondary gear has an insertion hole for cooperating with the insertion limiting part. The insertion limiting part and the insertion hole are inserted and cooperated with each other, and the two are connected in a way that prevents relative rotation when the insertion limiting part and the insertion hole are inserted and cooperated with each other.

[0005] Preferably, the insertion limiting part is a spline shaft, and the insertion hole is a spline hole corresponding to the spline shaft.

[0006] Preferably, the transmission mechanism further includes an outer cover covering the main gear and the secondary gear, the outer cover having a plurality of through holes corresponding to the insertion holes, the through holes for the axle to pass through.

[0007] Preferably, the through hole is provided with a plurality of limiting elastic pins circumferentially facing the center of the through hole, and the axle is provided with an annular limiting groove for cooperating with the limiting elastic pins.

[0008] Preferably, the limiting elastic pin includes a ball and a spring. The outer periphery of the through hole is provided with a pin hole facing the center of the through hole. The opening of the pin hole is provided with a constricted portion with a diameter smaller than that of the ball. The ball is movably disposed in the pin hole, and the pin hole is provided with a spring for driving the ball to move towards the center of the through hole.

[0009] Preferably, the outer cover is provided with a fixing buckle for engaging with the handwheel.

[0010] The beneficial effects of this utility model of a high-pressure bypass drive device are as follows: In emergency situations, the electric actuator of this utility model can be driven by a handwheel. In order to cope with various different load conditions, a speed change mechanism is set up to cooperate with the handwheel. When the load of the high-pressure bypass regulating valve is small, the wheel axle can be inserted into the secondary gear with a larger diameter, which can drive the electric actuator to operate faster. When the load of the high-pressure bypass regulating valve is large, the wheel axle can be inserted into the secondary gear with a smaller diameter, which is more labor-saving. During use, the appropriate secondary gear can be selected according to the actual situation, thereby adjusting the transmission ratio and making the drive more convenient.

[0011] The features and advantages of this utility model will be described in detail through embodiments and accompanying drawings. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the main structure of a high-voltage bypass drive device according to this utility model.

[0013] Figure 2 This is a side view of the high-voltage bypass drive device after removing the handwheel, according to this utility model.

[0014] Figure 3 This is a side view sectional structural schematic diagram of a high-voltage bypass drive device according to this utility model.

[0015] Figure 4 This is a schematic diagram of the front view of a high-voltage bypass drive device according to this utility model.

[0016] Figure 5 yes Figure 4 A magnified structural diagram of part A.

[0017] in:

[0018] 1-Electric actuator; 2-Control unit; 3-Handwheel; 4-Main gear; 5-Secondary gear; 6-Outer cover; 7-Limiting elastic pin; 8-Fixing buckle; 11-Input shaft; 31-Axle; 51-Insertion hole; 61-Through hole; 71-Ball; 72-Spring; 73-Pin hole; 311-Insertion limiting part; 312-Annular limiting groove. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit its scope. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the present utility model.

[0020] In the description of this utility model, it should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to or indirectly connected to the other element.

[0021] In the description of this utility model, it should be noted that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0022] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example 1

[0023] See Figure 1 This utility model discloses a high-pressure bypass drive device, including a high-pressure bypass regulating valve and an electric actuator 1 for driving the high-pressure bypass regulating valve. The electric actuator has powerful signal receiving and processing capabilities, and can accurately receive 4-20mA analog signals and switch input commands. In emergency situations, it can achieve rapid response, with opening and closing times both less than 10 seconds. Compared with the original pneumatic positioner, the response speed is greatly improved, enabling rapid action at critical moments to ensure unit safety.

[0024] See Figures 1-5The electric actuator 1 is equipped with a control unit 2 connected to the electric actuator 1. The electric actuator 1 is equipped with an output shaft and an input shaft 11 for transmission connection with the high-pressure bypass regulating valve. The input shaft 11 is equipped with a handwheel 3 and a speed change mechanism that are in transmission cooperation with it. The speed change mechanism includes a main gear 4 sleeved on the input shaft 11 and several auxiliary gears 5 arranged around the outer circumference of the main gear 4 and meshing with the main gear 4. The auxiliary gears 5 are rotatably mounted on the electric actuator 1, and each auxiliary gear 5 has a different outer diameter. The handwheel 3 is equipped with a wheel axle 31 at its center. The end of the wheel axle 31 is equipped with a plug-in limiting part 311. The auxiliary gear 5 is equipped with a plug-in hole 51 at its center for cooperation with the plug-in limiting part 311. The plug-in limiting part 311 is plugged into the plug-in hole 51, and the two are connected in a way that prevents relative rotation when the plug-in limiting part 311 and the plug-in hole 51 are plugged into each other. In this embodiment, the electric actuator 1 is normally driven by electricity. In an emergency, the electric actuator 1 can be driven by a handwheel. To cope with various load conditions, this embodiment is equipped with a speed-changing mechanism that works in conjunction with the handwheel 3. When the load on the high-pressure bypass regulating valve is small, the axle 31 can be inserted into the larger diameter secondary gear 5, which can drive the electric actuator 1 to operate faster. When the load on the high-pressure bypass regulating valve is large, the axle 31 can be inserted into the smaller diameter secondary gear 5, which is more labor-saving. When using it, the appropriate secondary gear 5 can be selected according to the actual situation, making the drive more convenient.

[0025] Specifically, the insertion limiting part 311 is a splined shaft, and the insertion hole 51 is a splined hole corresponding to the splined shaft. The cooperation between the two achieves transmission coordination, resulting in more stable transmission.

[0026] See Figure 1 , Figure 2 The transmission mechanism also includes an outer cover 6 covering the main gear 4 and the secondary gear 5. The outer cover 6 has several through holes 61 corresponding to the insertion holes 51, and the through holes 61 allow the axle 31 to pass through. The outer cover 6 can be used to protect the main gear 4 and the secondary gear 5, improving safety.

[0027] Preferably, each of the through holes 61 is provided with a plug that is detachably connected to it, and the plug is used to seal the through hole 61 to prevent dust and other substances from entering. Example 2

[0028] See Figure 4 , Figure 5Based on Embodiment 1, the through hole 61 is provided with a plurality of limiting elastic pins 7 circumferentially facing the center of the through hole 61, and the wheel axle 31 is provided with an annular limiting groove 312 for cooperating with the limiting elastic pins 7. The limiting elastic pins 7 and the annular limiting groove 312 cooperate to limit the wheel axle 31, preventing the handwheel 3 from easily coming loose during use.

[0029] See Figure 4 , Figure 5 The limiting elastic pin 7 includes a ball 71 and a spring 72. A pin hole 73 is provided on the outer periphery of the through hole 61, facing the center of the through hole 61. The opening of the pin hole 73 has a constricted portion with a diameter smaller than that of the ball 71. The ball 71 is movably disposed within the pin hole 73, and a spring 72 is provided within the pin hole 73 to drive the ball 71 to move towards the center of the through hole 61. Through the cooperation of the ball 71 with the annular limiting groove 312, the ball 71 can fit against and rotate with the annular limiting groove 312 when the axle 31 rotates, reducing resistance and making rolling smoother.

[0030] The working process of this utility model:

[0031] In the operation of this utility model, a high-pressure bypass drive device can, when the load on the high-pressure bypass regulating valve is small, insert the axle 31 into the larger diameter secondary gear 5 to drive the electric actuator 1 to operate faster. When the load on the high-pressure bypass regulating valve is large, insert the axle 31 into the smaller diameter secondary gear 5 to save effort.

[0032] All standard parts used in this application can be purchased from the market. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the existing technology. The internal components of the electric slide rail, cylinder, welding machine, electric telescopic rod and controller all adopt conventional models in the existing technology, and their internal structure belongs to the existing technology structure. Workers can complete the normal operation of them according to the existing technical manual. In addition, the circuit connection adopts the conventional connection method in the existing technology, and will not be described in detail here.

[0033] It should be noted that although the above embodiments have been described herein, this does not limit the scope of patent protection for this utility model. Therefore, any changes and modifications made to the embodiments described herein based on the innovative concept of this utility model, or equivalent structural or procedural transformations made using the content of this utility model's specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields, are all included within the scope of protection of this utility model patent.

Claims

1. A high-pressure bypass drive device, comprising a high-pressure bypass regulating valve and an electric actuator (1) operatively connected to the high-pressure bypass regulating valve, wherein the electric actuator (1) is provided with a control unit (2) operatively connected to the electric actuator (1), and the electric actuator (1) is provided with at least one output shaft operatively connected to the high-pressure bypass regulating valve, characterized in that: The electric actuator (1) is also provided with at least one input shaft (11). The input shaft (11) is provided with a handwheel (3) and a speed change mechanism that are in transmission cooperation with it. The speed change mechanism includes a main gear (4) sleeved on the input shaft (11) and several auxiliary gears (5) arranged around the outer periphery of the main gear (4) and meshing with the main gear (4). The auxiliary gears (5) are rotatably mounted on the electric actuator (1), and each auxiliary gear (5) has a different outer diameter. The handwheel (3) is provided with a wheel axle (31) at its center. The wheel axle (31) is provided with a plug-in limiting part (311) at its end. The auxiliary gear (5) is provided with a plug-in hole (51) at its center for cooperating with the plug-in limiting part (311). The plug-in limiting part (311) is plugged into the plug-in hole (51), and the plug-in limiting part (311) and the plug-in hole (51) are connected in a way that prevents them from rotating relative to each other.

2. A high voltage bypass drive apparatus as claimed in claim 1, characterized in that: The insertion limiting part (311) is a spline shaft, and the insertion hole (51) is a spline hole corresponding to the spline shaft.

3. A high voltage bypass drive apparatus as claimed in claim 1, characterized in that: The transmission mechanism also includes an outer cover (6) covering the main gear (4) and the secondary gear (5). The outer cover (6) has several through holes (61) corresponding to the insertion hole (51), and the through holes (61) allow the axle (31) to pass through.

4. The high-voltage bypass drive device as described in claim 3, characterized in that: The through hole (61) is provided with a plurality of limiting elastic pins (7) arranged toward the center of the through hole (61) in the circumferential direction, and the axle (31) is provided with an annular limiting groove (312) for cooperating with the limiting elastic pins (7).

5. A high voltage bypass drive apparatus as claimed in claim 4, characterized in that: The limiting elastic pin (7) includes a ball (71) and a spring (72). The outer periphery of the through hole (61) is provided with a pin hole (73) facing the center of the through hole (61). The opening position of the pin hole (73) is provided with a constriction portion with a diameter smaller than that of the ball (71). The ball (71) is movably disposed in the pin hole (73), and the pin hole (73) is provided with a spring (72) for driving the ball (71) to move towards the center of the through hole (61).

6. A high voltage bypass drive apparatus as claimed in claim 3, characterized in that: The outer cover (6) is provided with a fixing buckle (8) for engaging with the handwheel (3).

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