Three-position operating mechanism and three-position switch

Abstract

The invention relates to a high-voltage air circuit breaker without an arc extinguishing or arc preventing device, in particular to a three-station operating mechanism and a three-station switch. The three-station switch comprises a three-station operating mechanism, the three-station operating mechanism comprises a mechanism plate, a worm wheel shaft and an auxiliary switch are installed on the mechanism plate, and the worm wheel shaft is in transmission connection with a switch shaft of the auxiliary switch through a transmission mechanism so as to output station information to the outside. The transmission mechanism comprises a driving belt wheel assembled on the worm wheel shaft in a rotation stopping mode, a driven belt wheel assembled on the switch shaft in a rotation stopping mode and a synchronous belt connected between the driving belt wheel and the driven belt wheel, the synchronous belt is tightly matched with the driving belt wheel and the driven belt wheel through a tooth-shaped structure of the synchronous belt, stable rotation and linear motion are achieved, and the driven belt wheel comprises a wheel body. The two axial sides of the wheel body are respectively and fixedly provided with a wheel body mounting plate, the wheel body mounting plates are provided with rotation-stopping matching holes matched with a switch shaft, a combined design is adopted, the driven belt wheel adopts a standard part, and the production and maintenance cost can be reduced.

Description

Technical Field

[0001] The invention relates to a high-voltage air circuit breaker without arc extinguishing or arc protection device, in particular to a three-position operating mechanism and a three-position switch. Background Art

[0002] In modern automation equipment, three-position switches are widely used in various electrical control systems. Their main function is to control the equipment by switching between different positions. The three-position switch has three positions: opening, closing, and grounding. It integrates the functions of the isolating switch and the grounding switch. It is completed by a switch knife, realizing mechanical interlocking, preventing the main circuit from closing the grounding knife with power on, and avoiding the possibility of misoperation.

[0003] The three-position switch is composed of an operating mechanism, a transmission mechanism, a knife moving contact mechanism and a three-position static contact mechanism. The output shaft of the operating mechanism drives the main shaft of the three-position switch, and then drives the knife moving contact to rotate, so as to realize the opening, closing and grounding of the three-position switch. The operating mechanism includes a mechanism plate, on which a motor is installed and a worm gear shaft is rotated to output power to the transmission mechanism. The motor output shaft and the worm gear shaft are connected through a gear transmission mechanism. In order to output the position signal to the outside, an auxiliary switch is also provided on the mechanism plate. The switch shaft of the auxiliary switch is a stop shaft (the cross section is non-circular, generally a square shaft), and the switch shaft is connected to the worm gear shaft through a connecting rod transmission mechanism.

[0004] For example, the utility model patent with authorization announcement number CN205828246U and authorization announcement date of December 21, 2016 discloses a common three-position auxiliary switch connecting rod mechanism, the connecting rod mechanism includes an output crank arm connected to the output shaft of the motor, the output crank arm is connected to the switch crank arm through the connecting rod transmission, the switch crank arm is fixedly assembled on the switch shaft of the auxiliary switch, and the working state of the auxiliary switch can be synchronously changed according to the position of the three-position mechanism through the connecting rod mechanism. In this structure, due to the design of the connecting rod mechanism itself, the range of motion is limited, which may lead to a dead point.

[0005] In multi-station operations, three-station switches need to switch stations frequently, and the design of the operating mechanism has many limitations. In addition to the limited motion range of the above-mentioned connecting rod mechanism, dead point phenomenon will occur, and the auxiliary switch cannot be effectively triggered, causing the equipment to stagnate or malfunction. At present, most auxiliary switches are fixed in position and cannot be adjusted, which makes it difficult to meet diverse operating requirements; currently, the design of many auxiliary switches is not flexible in adjusting the number of contacts and cannot be changed in time according to needs. Summary of the invention

[0006] The object of the present invention is to provide a three-position operating mechanism to solve the problem of auxiliary switch triggering failure caused by the limited motion range of the existing auxiliary switch transmission device.

[0007] At the same time, the purpose of the present invention is also to provide a three-position switch to solve the above problems.

[0008] In order to solve the above problems, the three-station operating mechanism of the present invention adopts the following technical solutions:

[0009] A three-station operating mechanism comprises a mechanism plate, on which a worm gear shaft and an auxiliary switch are mounted, the worm gear shaft and the switch shaft of the auxiliary switch are connected via a transmission mechanism, the transmission mechanism comprises a driving pulley non-rotatably mounted on the worm gear shaft, a driven pulley non-rotatably mounted on the switch shaft, and a synchronous belt connected between the driving pulley and the driven pulley; the driven pulley comprises a wheel body, on both axial sides of the wheel body are respectively fixedly connected wheel body mounting plates, the wheel body mounting plate having a non-rotatable mating hole for non-rotatably mating with the switch shaft.

[0010] Furthermore, the wheel body mounting plate and the wheel body are fixedly connected via fasteners arranged along the axial direction of the wheel body.

[0011] Furthermore, the driving pulley is fixed on the worm gear shaft through a limiting sleeve.

[0012] Furthermore, a tensioning wheel mounting hole for mounting a tensioning wheel is provided on the mechanism plate to adjust the tension of the synchronous belt.

[0013] Furthermore, a movable bracket is installed on the mechanism plate, and the auxiliary switch is installed on the mechanism plate through the movable bracket. A plurality of mounting holes corresponding to the movable bracket are opened on the mechanism plate to adjust the position of the auxiliary switch and the synchronous belt wheel spacing.

[0014] Furthermore, the movable bracket includes a fixed plate fixedly connected to the mechanism plate and a movable support plate fixedly connected to an end of the auxiliary switch away from the mechanism plate, and a telescopic matching structure along the axial direction of the auxiliary switch is provided between the fixed plate and the movable support plate.

[0015] Furthermore, the telescopic matching structure includes a fixed plate tail plate and a supporting plate tail plate extending toward each other from the same side of the fixed plate and the movable supporting plate, respectively; one of the fixed plate tail plate and the supporting plate tail plate is provided with a long guide groove, and the other is provided with a sliding block embedded in the long guide groove.

[0016] Furthermore, the auxiliary switch is installed on the mechanism plate through a switch support, and the switch support includes a fixed plate fixedly connected to the mechanism plate and a movable support plate fixedly connected to one end of the auxiliary switch away from the mechanism plate, and a telescopic matching structure along the axial direction of the auxiliary switch is provided between the fixed plate and the movable support plate.

[0017] Furthermore, the telescopic matching structure includes a fixed plate tail plate and a supporting plate tail plate extending toward each other from the same side of the fixed plate and the movable supporting plate, respectively; one of the fixed plate tail plate and the supporting plate tail plate is provided with a long guide groove, and the other is provided with a sliding block embedded in the long guide groove.

[0018] Beneficial effects: The three-station operating mechanism of the present invention is an improved invention. The three-station operating mechanism of the present invention includes a mechanism plate, a worm gear shaft and an auxiliary switch are mounted on the mechanism plate, the worm gear shaft and the switch shaft of the auxiliary switch are connected by a transmission mechanism to output the station information to the outside, the transmission mechanism includes a driving pulley mounted on the worm gear shaft, a driven pulley mounted on the switch shaft, and a synchronous belt connected between the driving pulley and the driven pulley, the synchronous belt is closely matched with the driving pulley and the driven pulley through its tooth structure to achieve smooth rotation and linear motion, the driven pulley includes a wheel body, and wheel body mounting plates are fixedly connected on both axial sides of the wheel body, the wheel body mounting plate has a rotation-stopping mating hole that is matched with the switch shaft, and adopts a combined design, and the driven pulley adopts standard parts, which can reduce production and maintenance costs.

[0019] The three-position switch of the present invention adopts the following scheme:

[0020] A three-position switch comprises a three-position operating mechanism, which comprises a mechanism plate, on which a worm gear shaft and an auxiliary switch are mounted, the worm gear shaft and the switch shaft of the auxiliary switch are connected via a transmission mechanism, the transmission mechanism comprises a driving pulley non-rotatably mounted on the worm gear shaft, a driven pulley non-rotatably mounted on the switch shaft, and a synchronous belt connected between the driving pulley and the driven pulley; the driven pulley comprises a wheel body, on both axial sides of the wheel body are respectively fixedly connected wheel body mounting plates, the wheel body mounting plate having a non-rotatable mating hole for non-rotatably mating with the switch shaft.

[0021] Furthermore, the wheel body mounting plate and the wheel body are fixedly connected via fasteners arranged along the axial direction of the wheel body.

[0022] Furthermore, the driving pulley is fixed on the worm gear shaft through a limiting sleeve.

[0023] Furthermore, a tensioning wheel mounting hole for mounting a tensioning wheel is provided on the mechanism plate to adjust the tension of the synchronous belt.

[0024] Furthermore, a movable bracket is installed on the mechanism plate, and the auxiliary switch is installed on the mechanism plate through the movable bracket. A plurality of mounting holes corresponding to the movable bracket are opened on the mechanism plate to adjust the position of the auxiliary switch and the synchronous belt wheel spacing.

[0025] Furthermore, the movable bracket includes a fixed plate fixedly connected to the mechanism plate and a movable support plate fixedly connected to an end of the auxiliary switch away from the mechanism plate, and a telescopic matching structure along the axial direction of the auxiliary switch is provided between the fixed plate and the movable support plate.

[0026] Furthermore, the telescopic matching structure includes a fixed plate tail plate and a supporting plate tail plate extending toward each other from the same side of the fixed plate and the movable supporting plate, respectively; one of the fixed plate tail plate and the supporting plate tail plate is provided with a long guide groove, and the other is provided with a sliding block embedded in the long guide groove.

[0027] Furthermore, the auxiliary switch is installed on the mechanism plate through a switch support, and the switch support includes a fixed plate fixedly connected to the mechanism plate and a movable support plate fixedly connected to one end of the auxiliary switch away from the mechanism plate, and a telescopic matching structure along the axial direction of the auxiliary switch is provided between the fixed plate and the movable support plate.

[0028] Furthermore, the telescopic matching structure includes a fixed plate tail plate and a supporting plate tail plate extending toward each other from the same side of the fixed plate and the movable supporting plate, respectively; one of the fixed plate tail plate and the supporting plate tail plate is provided with a long guide groove, and the other is provided with a sliding block embedded in the long guide groove.

[0029] Beneficial effects: The three-position switch of the present invention is an improved invention. The three-position switch of the present invention includes a three-position operating mechanism, which includes a mechanism plate, on which a worm gear shaft and an auxiliary switch are mounted, and the worm gear shaft is connected to the switch shaft of the auxiliary switch through a transmission mechanism to output the position information to the outside, and the transmission mechanism includes a driving pulley mounted on the worm gear shaft, a driven pulley mounted on the switch shaft, and a synchronous belt connected between the driving pulley and the driven pulley, and the synchronous belt is closely matched with the driving pulley and the driven pulley through its toothed structure to achieve smooth rotation and linear motion, and the driven pulley includes a wheel body, and wheel body mounting plates are fixedly connected on both axial sides of the wheel body, and the wheel body mounting plate has a rotation-stopping mating hole that is matched with the switch shaft, and adopts a combined design, and the driven pulley adopts standard parts, which can reduce production and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of an embodiment of the three-station operating mechanism of the present invention;

[0031] Figure 2 for Figure 1 An extended schematic diagram of an auxiliary switch in the embodiment;

[0032] Figure 3 for Figure 1 A schematic diagram of the assembly of the square hole driven wheel in the embodiment;

[0033] Figure 4 for Figure 1 A schematic structural diagram of a synchronous belt transmission system in an embodiment.

[0034] In the figure: 1. Limiting sleeve; 2. Driving pulley; 3. Synchronous belt; 4. Switch shaft; 5. Driven pulley; 6. Movable bracket; 7. Auxiliary switch; 8. Tensioner mounting hole; 9. Movable support plate; 10. Wheel body mounting plate; 11. Wheel body; 12. Worm gear shaft; 13. Mechanism plate; 14. Anti-rotation fitting hole; 15. Fixed plate; 16. Fixed plate tail plate; 17. Support plate tail plate; 18. Movable bracket mounting hole. DETAILED DESCRIPTION

[0035] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0036] In practical applications, the design of the auxiliary switch in the three-station mechanism switch often has many limitations, especially the limited range of motion of the connecting rod, which leads to the occurrence of dead point phenomenon. This phenomenon affects the accurate switching and operational flexibility of the switch, limits the performance of the equipment, and therefore the necessity of improving its design is becoming increasingly prominent. The concept of the present invention is to design a three-station operating mechanism, set the transmission mechanism between the worm gear shaft of the operating mechanism and the auxiliary switch as a synchronous belt transmission mechanism, and use the characteristics of the synchronous belt transmission mechanism such as no dead point and flexible setting to solve the problem of failure to trigger the auxiliary switch caused by the limited range of motion of the connecting rod structure.

[0037] Based on the above ideas, Figure 1 , 34. In a basic embodiment, the three-station operating mechanism of the present invention includes a mechanism plate 13, on which a worm gear shaft 12 and an auxiliary switch 7 are mounted, and the worm gear shaft 12 is connected to the switch shaft 4 of the auxiliary switch 7 through a transmission mechanism. The worm gear shaft 12 transmission mechanism includes a driving pulley 2 fixedly mounted on the worm gear shaft 12, a driven pulley 5 fixedly mounted on the switch shaft 4, and a synchronous belt 3 connected between the driving pulley 2 and the driven pulley 5. The synchronous belt 3 is tightly matched with the driving pulley 2 and the driven pulley 5 through its toothed structure to achieve smooth rotation and linear motion. The driving pulley 2 is driven by the worm gear shaft 3. The motion is transmitted to the driven pulley 5 via the synchronous belt 3, forming an efficient power transmission system. The design of the synchronous belt drive ensures that no slip occurs during operation, and at the same time maintains good tensile strength under the premise of load changes; the driven pulley 5 includes a wheel body 11, and a wheel body mounting plate 10 is fixedly connected to the axial sides of the wheel body 11 respectively. The wheel body 11 of the driven pulley 5 has existing standard parts. In order to save costs and reduce processing technology, standard parts are used for modification. In order to cooperate with the switch shaft 4, wheel body mounting plates 10 are added on both sides of the wheel body 11. The wheel body mounting plate 10 has a rotation-stopping mating hole 14 that cooperates with the switch shaft 4.

[0038] In a preferred embodiment, the wheel body mounting plate 10 and the wheel body 11 are fixedly connected by fasteners (not shown) arranged along the axial direction of the wheel body 11 to ensure the stability of the structure of the driven pulley 5 during operation and avoid the deviation of the synchronous belt, wherein the fasteners may be bolts, screws, rivets and other components. In other embodiments, the wheel body mounting plate is also fixed to the wheel body by welding, which may increase the subsequent maintenance cost and difficulty, but can also achieve similar functions.

[0039] In a preferred embodiment, the driving pulley 2 is fixed on the worm gear shaft 3 by a limiting sleeve 1. In order to prevent the synchronous belt 3 from being worn eccentrically, it is necessary to ensure that the driving pulley 2 and the driven pulley 5 are on the same mounting surface during assembly. The driving pulley 2 is stable and convenient to assemble and easy to adjust, which greatly improves the assembly process and reduces the difficulty of on-site installation. In other embodiments, the driving pulley 2 can be fixed on the worm gear shaft 3 by a key connection. Although this position is fixed and difficult to adjust, which will increase the difficulty of on-site installation, it can still achieve the cooperation between the driving wheel and the worm gear shaft.

[0040] In a preferred embodiment, a tensioning wheel mounting hole 8 for mounting a tensioning wheel is provided on the mechanism plate 13. The actual working conditions on site are complex. According to different working conditions, the tension of the synchronous belt needs to be adjusted. By installing a tensioning wheel, the tightness of the synchronous belt 3 can be conveniently adjusted. In other embodiments, although the tensioning wheel is not installed during on-site installation, it is complicated and difficult to adjust the tension and the maintenance difficulty is increased, but it can also meet the working requirements.

[0041] In a preferred embodiment, a movable bracket 6 is installed on the mechanism plate 13, and the movable bracket 6 is used to adapt to the complex installation environment on site. The auxiliary switch 7 is installed on the mechanism plate 13 through the movable bracket 6. A plurality of mounting holes 18 corresponding to the movable bracket 6 are opened on the mechanism plate, and the position of the auxiliary switch 7 can be adjusted by moving the movable bracket 6, and the wheelbase of the synchronous belt 3 can be changed. In other embodiments, although the movable bracket is not provided due to the difference in the working environment on site, the corresponding structure needs to be produced non-standardly, which increases the cost, but it can also work normally.

[0042] like Figure 2 In a preferred embodiment, the movable bracket 6 includes a fixed plate 15 fixedly connected to the mechanism plate 13 and a movable support plate 9 fixedly connected to the end of the auxiliary switch 7 away from the mechanism plate. The auxiliary switch 7 is supported and fixed by the fixed plate 15 and the movable support plate 9. A telescopic matching structure along the axial direction of the auxiliary switch 7 is provided between the fixed plate 15 and the movable support plate 9. The spacing between the fixed plate 15 and the movable support plate 9 can be freely adjusted through the telescopic matching structure to adapt to the auxiliary switches 7 with different numbers of contacts. In other embodiments, the movable bracket 6 is not a necessary condition for the establishment of the telescopic matching structure. The movable bracket 6 has one and only one mounting hole 18 on the structure plate 13, so that it cannot adjust its position. It can also be designed with the above-mentioned telescopic matching structure to achieve the same effect.

[0043] In a preferred embodiment, the telescopic cooperation structure includes a fixed plate tail plate 16 and a support plate tail plate 17 extending toward each other from the same side of the fixed plate 15 and the movable support plate 9, respectively. One of the fixed plate tail plate 16 and the support plate tail plate 17 is provided with a long guide groove, and the other is provided with a slider embedded in the long guide groove. Through the cooperation of the slider and the long guide groove, the movable support plate 9 can slide axially to avoid radial jump of the auxiliary switch 7 on the switch shaft 4, which affects the normal operation of the operating mechanism.

[0044] In the working state, the motor drives the worm gear shaft 12 to rotate, and the worm gear shaft 12 drives the three-position switch to switch between different positions through the transmission mechanism. In order to output the position information, the worm gear shaft 12 drives the driving pulley 2 to rotate, the driving pulley 2 drives the synchronous belt 3 to move, and the synchronous belt 3 drives the driven pulley 5 to rotate, thereby rotating the switch shaft 4 of the auxiliary switch 7. Through the rotation of the switch shaft 4, the position information is sent from the contact point of the auxiliary switch 7.

[0045] In the face of the complex environment during on-site installation, the auxiliary switch 7 needs to be adjusted in position. The movable bracket 6 is installed and adjusted between different mounting holes 18 on the structural plate 13 so that the auxiliary switch installation position and the synchronous belt wheel spacing meet the on-site work requirements. According to the requirements of the on-site auxiliary switch 7 contacts, according to the prior art, the contact module of the auxiliary switch can be plugged in and out to meet the requirements. After the auxiliary switch 7 is installed, its length will change accordingly. At this time, the limit block on the support plate tail frame 17 is placed in the guide groove of the fixed plate tail frame 16, so that the movable support plate 9 and the fixed plate 15 are slidably matched, and the movable support plate 9 is slid along the switch shaft 4 so that there is no gap between it and the auxiliary switch 7, and the sliding support plate 9 is fixed to the auxiliary switch 7.

[0046] The specific implementation of the three-position switch of the present invention is:

[0047] The three-position switch of the present invention comprises a three-position operating mechanism. The specific implementation of the three-position operating mechanism is as described above and will not be described in detail.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A three-position operating mechanism, comprising a mechanism plate, on which a worm gear shaft and an auxiliary switch are mounted, wherein the worm gear shaft and the switch shaft of the auxiliary switch are connected by a transmission mechanism, characterized in that: The transmission mechanism includes a driving pulley anti-rotationally mounted on the worm gear shaft, a driven pulley anti-rotationally mounted on the switch shaft, and a synchronous belt connected between the driving pulley and the driven pulley; the driven pulley includes a wheel body, and wheel body mounting plates are respectively fixedly connected to the axial sides of the wheel body, and the wheel body mounting plate has an anti-rotation mating hole anti-rotationally mating with the switch shaft.

2. The three-station operating mechanism according to claim 1, characterized in that: The wheel body mounting plate and the wheel body are fixedly connected via fasteners arranged along the axial direction of the wheel body.

3. The three-position operating mechanism according to claim 1 or 2, characterized in that: The driving pulley is fixed on the worm gear shaft through a limiting shaft sleeve.

4. The three-position operating mechanism according to claim 1 or 2, characterized in that: The mechanism plate is provided with a tensioning wheel mounting hole for mounting a tensioning wheel to adjust the tension of the synchronous belt.

5. The three-position operating mechanism according to claim 1 or 2, characterized in that: A movable bracket is installed on the mechanism plate, and the auxiliary switch is installed on the mechanism plate through the movable bracket. A plurality of mounting holes corresponding to the movable bracket are opened on the mechanism plate to adjust the position of the auxiliary switch and the synchronous belt wheel spacing.

6. The three-position operating mechanism according to claim 5, characterized in that: The movable bracket includes a fixed plate fixedly connected to the mechanism plate and a movable support plate fixedly connected to an end of the auxiliary switch away from the mechanism plate, and a telescopic matching structure along the axial direction of the auxiliary switch is provided between the fixed plate and the movable support plate.

7. The three-position operating mechanism according to claim 6, characterized in that: The telescopic matching structure includes a fixed plate tail plate and a supporting plate tail plate extending toward each other from the same side of the fixed plate and the movable supporting plate respectively, one of the fixed plate tail plate and the supporting plate tail plate is provided with a long strip guide groove, and the other is provided with a sliding block embedded in the long strip guide groove.

8. The three-position operating mechanism according to claim 1 or 2, characterized in that: The auxiliary switch is installed on the mechanism plate through a switch support. The switch support includes a fixed plate fixedly connected to the mechanism plate and a movable support plate fixedly connected to an end of the auxiliary switch away from the mechanism plate. A telescopic matching structure along the axial direction of the auxiliary switch is provided between the fixed plate and the movable support plate.

9. The three-station operating mechanism according to claim 8, characterized in that: The telescopic matching structure includes a fixed plate tail plate and a supporting plate tail plate extending toward each other from the same side of the fixed plate and the movable supporting plate respectively, one of the fixed plate tail plate and the supporting plate tail plate is provided with a long strip guide groove, and the other is provided with a sliding block embedded in the long strip guide groove.

10. A three-position switch, comprising a three-position operating mechanism, characterized in that: The three-station operating mechanism is the three-station operating mechanism described in any one of claims 1-9.

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