Manual vacuum circuit breaker transmission

Abstract

To provide a transmission device for a manual vacuum circuit breaker that can move the vacuum circuit breaker body through an explosion-proof door and ensures the safety protection of a user. [Solution] The system comprises an L-shaped pull-out table 1 installed inside a protective box including an explosion-proof door, and a vacuum circuit breaker body 2 that is movably installed on the L-shaped pull-out table 1 and displaces forward to the preparation position of the L-shaped pull-out table 1 or backward to the power supply connection position. A transmission device 3 including a lead screw transmission unit 30 is provided on the L-shaped pull-out table 1. The lead screw transmission unit 30 includes a double-strand lead screw 31 and a double-strand lead screw transmission base. A support frame is connected to the double-strand lead screw transmission base. The support frame supports and fixes the bottom of the vacuum circuit breaker body 2. When the double-strand lead screw 31 is rotated in the forward or reverse direction, the support frame and the vacuum circuit breaker body 2 are displaced backward to the power supply connection position or forward to the preparation position via the double-strand lead screw transmission base.

Description

[Technical field]

[0001] This invention relates to a transmission device for a manual vacuum circuit breaker, and relates to a technology for adding a transmission device to achieve the physical safety protection of workers, thereby stabilizing the displacement speed, ensuring the stroke length and distance, and stabilizing the swing-in and swing-out speed of the vacuum circuit breaker body. [Background technology]

[0002] A VCB (Vacuum Circuit Breaker) is a safety switch for the load rated voltage and current, and is a safety protection device that automatically trips when the load exceeds an abnormal limit, and is a switch device that safely protects life and property. In the 1970s, people were economically poor and simply wanted to have food and clothing.

[0003] The structure of vacuum circuit breakers of this era was based on the economic situation at the time and was aimed to be as simple and practical as possible, low-cost, small and space-saving. Considering the technology and costs at the time, the manual specifications did not have a transmission system, and the standard model sizes were fixed for several decades. To this day, the PW specifications do not have a transmission system and remain manual.

[0004] To prevent electric shock due to dust or human contact, vacuum circuit breakers usually have a protective case 4 (see Fig. 2) to ensure safety. When operating a manual vacuum circuit breaker, one first opens the explosion-proof door 41 (see Fig. 1) of the protective case 4, reaches into the protective case 4, approaches the vacuum circuit breaker, and uses the most primitive human strength to push the vacuum circuit breaker body 2 from the preparation position (interrupter position) A (see Fig. 2) on the front of the L-shaped pull-out table 1 to the power connection position (closing position) B (see Fig. 3) inside the L-shaped pull-out table 1.

[0005] When pulling out the vacuum circuit breaker body 2, similarly, the explosion-proof door 41 of the protective box 4 is first opened manually, and the vacuum circuit breaker body 2 is pulled out from the power connection position (connection position) B (see Figure 3) on the rear of the L-shaped pull-out table 1 to the cut-off position (preparation position) A (see Figure 2) on the front of the L-shaped pull-out table 1.

[0006] However, when pressing a vacuum circuit breaker by hand, if the pressing force is insufficient, the insulating sleeve connected to the rear end of the vacuum circuit breaker may burst due to an uneven impact force, which may result in serious losses such as damage to equipment or a power outage in the factory, preventing normal production.

[0007] Vacuum circuit breakers are high-voltage, high-current equipment. During the contact process, workers have different ages and physical strengths, and also have different operating force speeds and habits. Therefore, it is difficult to reliably control the depth of the copper joint contact surface and the length and area of ​​the directly affected contact surface. The moment the high voltage current comes into contact, it is easy for sparks, arcs, melting and even combustion to occur. If there is no isolation by the explosion-proof door 41, people are likely to come into direct contact with the high voltage voltage at close range, and there is a risk of being electric shock from the current, and the risk of electric shock will be even greater.

[0008] Vacuum circuit breakers deteriorate after 10 to 20 years of use, and will stop working if they break down or if a power outage occurs due to an abnormality. For example, in hospitals, railways, steelworks, and the electronics industry, if they stop functioning, serious losses will occur, so they must be restored immediately and repaired or replaced within the shortest possible time.

[0009] However, the length, height and width of the interior space of the old box are limited by the long history, and it is difficult to replace it in that space. The only way to replace the product models with different specifications is to remove the work room and create a new one, which will increase the space and take time for construction, and it is difficult for the owner to accept such a long-term power outage. For this reason, the old protective box 4 is used, the old vacuum circuit breaker is removed from the protective box, and the L-shaped drawer 1 of the same specification is replaced. The new manual vacuum circuit breaker body 2 is pushed in, and the vacuum circuit breaker specification is used in the limited space.

[0010] Thirty or forty years later, as the economy developed and lifestyles evolved, the safety of personal property became more important, and the owner began to pay attention to how to enable workers to work through explosion-proof door 41 without touching vacuum circuit breaker body 2, thereby ensuring the safety of workers' lives and property.

[0011] Manual circuit breakers have been used for nearly 40 years, from the 1970s to the present day, and require a person to first open the explosion-proof door 41 of the protective box 4 and then reach into the protective box 4. The high voltage vacuum circuit breaker is pushed or pulled out by using both hands, and there is no safety protection door. Therefore, even if each worker has different age, physical strength, operating force ability, speed, and habits, if the depth of the contact surface of the extended contact finger 21 (Reference Figure 4) cannot be controlled, the contact surface length is directly affected by the area, and the moment the high voltage current comes into contact, sparks, arcs, melting, and in some cases combustion may occur. Summary of the Invention [Problem to be solved by the invention]

[0012] SUMMARY OF THE PRESENT EMBODIMENT The present invention provides a transmission device for a manual vacuum circuit breaker that can move the vacuum circuit breaker body through an explosion-proof door and ensures the safety of users. [Means for solving the problem]

[0013] In order to solve the above problems, the transmission device of the manual vacuum circuit breaker of the present invention is installed inside a protective box including an explosion-proof door that can be opened and closed, and includes an L-shaped pull-out platform on which a number of insulating sleeve copper columns are respectively provided, and a vacuum circuit breaker body having a bottom on which a number of pulleys are pivoted, movably installed on the L-shaped pull-out platform, displacing forward to a preparation position or displacing backward to a power connection position in the front-rear direction of the L-shaped pull-out platform, and provided with a number of extended contact fingers. A transmission device is provided in the middle U-shaped groove of the L-shaped pull-out platform, and the transmission device includes a lead screw transmission unit, and the lead screw transmission unit is connected to the vacuum circuit breaker body. The lead screw transmission unit includes a double-start lead screw and a double-start lead screw transmission stand mounted on the lead screw, a support frame is coupled to the double-start lead screw transmission stand, and the support frame is used to support and fix the bottom of the vacuum circuit breaker body, and when the double-start lead screw is rotated in the forward or reverse direction, the support frame and the vacuum circuit breaker body are displaced backward to a power connection position at a speed of 6 to 10 millimeters (mm) per rotation via the double-start lead screw transmission stand, or displaced forward to a ready position at a speed of 6 to 10 millimeters (mm) per rotation. Effect of the Invention

[0014] According to the present invention, the vacuum circuit breaker body can be moved by operating the transmission device through the explosion-proof door, thereby achieving the protection of the user's physical safety.

[0015] In addition, the lead screw transmission unit of the added transmission device has a constant pitch (PIN pitch) and undergoes stable displacement at a speed of 6 to 10 millimeters (mm) per rotation, ensuring the length and distance of the stroke, stabilizing the swing-in and swing-out (backward and forward displacement) speed of the vacuum circuit breaker body, and ensuring a safe contact length and area between the extended contact finger and the insulating sleeve copper column when closing (connecting the power supply), and further ensuring the safety of workers' lives and property.

[0016] Without making any modifications or secondary processing to the L-shaped pull-out stand and the vacuum circuit breaker body, and assuming safety isolation protection by separating them with an explosion-proof door installed on the outer surface of the protective case, the rearward or forward displacement (swing-in, swing-out) of the vacuum circuit breaker body can be controlled, and it is no longer necessary for a person to open the explosion-proof door of the protective case before operation, reach into the protective case, and face the vacuum circuit breaker at close range and use the manual operation hole to perform a manual displacement operation that is dangerous. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a plan view of a known vacuum circuit breaker installed in a protective box with an explosion-proof door open. [Diagram 2] FIG. 1 is a perspective view of a vacuum circuit breaker body installed in a known protective box in a standby position; [Diagram 3] FIG. 1 is a perspective view of a vacuum circuit breaker body installed in a known protective box in a state where the main body is in a power supply connection (on) position. [Figure 4] FIG. 1 is a perspective view of a known vacuum interrupter with a vacuum interrupter body in a ready position; [Diagram 5] 1 is a perspective view of a vacuum circuit breaker according to an embodiment of the present invention installed in a protective box and in a standby position (explosion-proof door is not shown). [Figure 6] 1 is an enlarged perspective view of a vacuum circuit breaker according to an embodiment of the present invention in a standby position; [Figure 7] 1 is an enlarged perspective view of a vacuum circuit breaker according to an embodiment of the present invention, in which the vacuum circuit breaker body is in a power supply connection (closing) position; [Figure 8] 1 is an enlarged perspective view of a transmission device of a vacuum circuit breaker according to an embodiment of the present invention; [Figure 9] FIG. 2 is an enlarged perspective view of the transmission device of the vacuum circuit breaker according to the embodiment of the present invention, viewed from another angle. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. The embodiment shown in Figs. 5 to 9 is a transmission device for a manual vacuum circuit breaker.

[0019] In this embodiment, the manual vacuum circuit breaker includes an L-shaped pull-out base 1 and a vacuum circuit breaker body 2.

[0020] The L-shaped drawer table 1 is installed in a protective box 4 (see FIG. 5). The protective box 4 includes an explosion-proof door (not shown) that can be opened and closed. Further, a plurality of insulating sleeve copper columns 11 (see Figs. 6 to 7) are installed on each of the L-shaped drawer tables 1.

[0021] The vacuum circuit breaker body 2 has multiple pulleys 22 (see Figures 6 and 7) pivoted to its bottom and is movably installed on the L-shaped pull-out table 1. The vacuum circuit breaker body 2 can be displaced in the fore-and-aft direction of the L-shaped pull-out table 1 to a front preparation position A (see Figure 6) or a rear power connection position (closing position) B (see Figure 7). The vacuum circuit breaker body 2 is provided with a plurality of extended contact fingers 21 (see FIG. 6) which connect to the insulating sleeve copper columns 11 of the L-shaped pull-out base 1 when the power supply is connected (turned on).

[0022] An intermediate U-shaped groove 20 (see Figs. 6 to 7) is attached to the bottom of the L-shaped drawer table 1, and a transmission device 3 (see Figs. 6, 8 to 9) is provided in the intermediate U-shaped groove 20. The transmission 3 includes a lead screw transmission unit 30 . The lead screw transmission unit 30 includes a double-start lead screw 31 and a double-start lead screw transmission base 32 (see Figure 9) covering the double-start lead screw 31, and the double-start lead screw transmission base 32 is connected to a support frame 33, and the support frame 33 (see Figures 8 to 9) is used to support and fix the vacuum circuit breaker body 2.

[0023] When the double-start lead screw 31 is rotated in the forward or reverse direction, the support frame 33, along with the vacuum circuit breaker body 2, moves backward via the double-start lead screw transmission base 32 to the power connection position (closing position) B (see Reference Figure 7) at a speed of 6 to 10 millimeters (mm) per rotation, or moves forward to the preparation position A (see Figure 6) at a speed of 6 to 10 millimeters (mm) per rotation.

[0024] Furthermore, the front end of the double-start lead screw 31 of the lead screw transmission unit 30 has a multi-sided outer portion 311 (see Figures 6 to 7) (for example, a polygonal portion), and by correspondingly fitting the multi-sided outer portion 311 with a manual tool 5 (see Figures 6 to 7) (for example, shown in this embodiment as a polygonal socket wrench) having a polygonal groove (for example, an inner multi-sided polygonal groove) inside the tip, the double-start lead screw 31 can be easily rotated via the manual tool 5.

[0025] The transmission device 3 further includes a fixed frame 34 (see FIGS. 8 to 9). A plurality of fixing holes 341 are provided on both sides of the fixed frame 34, and each of them can be connected and fixed to the L-shaped drawer table 1 using a plurality of fixing members (not shown in the figure), or the fixed frame 34 can be connected and fixed to the L-shaped drawer table 1 using other connection methods.

[0026] In this embodiment, the double-thread lead screw transmission base 32 of the lead screw transmission unit 30 of the transmission device 3 is first connected to a connecting support frame 321 (see FIG. 9), and then connected and fixed to the support frame 33 via the connecting support frame 321. In addition, the support frame 33 has support rails 331 on both sides thereof for supporting the bottom of the vacuum circuit breaker, and fixing pieces 332 (see FIG. 8) are further provided on the front ends of the two support rails 331 for fixing the front edge of the bottom of the vacuum circuit breaker body 2.

[0027] The transmission device of the manual vacuum circuit breaker according to this embodiment has the following advantages.

[0028] 1. The device can be operated through an explosion-proof door (external operation), ensuring the physical safety of users.

[0029] Secondly, the lead screw transmission unit 30 of the added transmission device 3 has a constant pitch (PIN pitch) and can move stably at a speed of 6 to 10 millimeters (mm) per rotation, ensuring the length and distance of the stroke, making the swing-in and swing-out (backward and forward displacement) speed of the vacuum circuit breaker body more stable, and ensuring that the extended contact finger 21 and the insulating sleeve copper column 11 come into contact at a safe length and area when the power supply is connected (turned on), further ensuring the safety of life and property.

[0030] Third, the space can be flexibly utilized, and the transmission device 3 can be added by utilizing the narrow space of the intermediate U-shaped groove 20 of the L-shaped pull-out base 1, which can be safely isolated and protected by an explosion-proof door, and the rearward or forward displacement (swing-in, swing-out) of the vacuum circuit breaker body 2 can be operated. [Explanation of symbols]

[0031] 1 L-shaped drawer stand 11 Insulating sleeve copper pole 2. Vacuum circuit breaker body 20 Middle U-shaped groove 21 Extended contact finger 22 Pulley 23 Manual operation hole 3 Transmission 30 Lead screw transmission unit 31 Double thread lead screw 311 Multi-sided outline 32 Double lead screw transmission stand 321 Connecting support frame 33 Support frame 331 Support Rail 332 Fixed piece 34 Fixed Frame 341 Fixed hole 4 Protective box 41 Explosion-proof door 5 Hand tools A ready position B Power connection position

Claims

1. An L-shaped drawer table is installed inside a protective box including an openable explosion-proof door, and each drawer table is provided with a plurality of insulating sleeve copper columns; a vacuum circuit breaker body having a bottom on which a plurality of pulleys are pivotally mounted, the vacuum circuit breaker body being movably mounted on the L-shaped pull-out platform, and being provided with a plurality of extended contact fingers which are displaced forward to a preparation position or displaced backward to a power connection position in the front-rear direction of the L-shaped pull-out platform, and which are connected to the insulating sleeve copper poles of the L-shaped pull-out platform when in the power connection position; In a transmission device of a manual vacuum circuit breaker comprising: a transmission device is provided in the middle U-shaped groove of the L-shaped drawer, the transmission device including a lead screw transmission unit, the lead screw transmission unit including a double lead screw and a double lead screw transmission stand mounted on the lead screw, a support frame is coupled to the double lead screw transmission stand, the support frame is used to support and fix the bottom of the vacuum circuit breaker body, a transmission device for a manual vacuum circuit breaker, characterized in that when the double-start lead screw is rotated in a forward or reverse direction, the support frame and the vacuum circuit breaker body are displaced backward to a power supply connection position at a speed of 6 to 10 millimeters (mm) per rotation via the double-start lead screw transmission base, or displaced forward to a standby position at a speed of 6 to 10 millimeters (mm) per rotation.

2. 2. The transmission device for a manual vacuum circuit breaker according to claim 1, wherein a front end of the double-start lead screw of the lead screw transmission unit of the transmission device has a multi-sided outer portion, and the double-start lead screw can be rotated by fitting a hand tool having a polygonal groove corresponding to the multi-sided outer portion.

3. 2. The transmission device of claim 1, further comprising a fixed frame, both sides of which are connected and fixed to the L-shaped pull-out table.

4. 2. The transmission device of a manual vacuum circuit breaker according to claim 1, wherein the double-thread lead screw transmission base of the lead screw transmission unit of the transmission device is connected to a connecting support frame and is connected and fixed to the support frame via the connecting support frame.

5. 5. The transmission device of claim 4, wherein both sides of the support frame have support rails, the support rails supporting the bottom of the vacuum circuit breaker body.

6. 6. The transmission device of claim 5, further comprising a fixing piece provided at the front end of each of the two support rails, the fixing piece being used to fix a front edge of the bottom of the vacuum circuit breaker body.

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