A toggle switch mechanism for an explosion-proof distribution box

Abstract

The present invention discloses a toggle switch mechanism of an explosion-proof distribution box, which relates to the field of switch technology, and includes a mounting shell, wherein the mounting shell is rotatably connected to a toggle arm, wherein the mounting shell is fixedly connected to a plurality of pins, wherein the mounting shell is slidably connected to a toggle frame for limiting and cooperating with the toggle arm, wherein the toggle frame is fixedly connected to a moving contact piece, wherein the moving contact piece contacts the adjacent pins, wherein the mounting shell is slidably connected to a sliding frame symmetrically distributed along the mounting shell, wherein the sliding frame is fixedly connected to an insulating top block, wherein the insulating top block contacts the moving contact piece. The present invention utilizes the insulating top block to first elastically lift the moving contact piece upward, and then slightly vertically lowers the moving contact piece onto the pin, so that the moving contact piece can slowly, steadily, and frictionlessly contact or disconnect when disconnecting and contacting, thereby avoiding local temperature rise and contact point bounce, thereby reducing the probability of arc occurrence and reducing the risk of fire or explosion.

Description

Technical Field

[0001] The invention relates to the technical field of switches, and in particular to a toggle switch mechanism of an explosion-proof distribution box. Background Art

[0002] A three-pin, two-position switch is a common toggle switch that is widely used in many electronic devices due to its simplicity and versatility. This toggle switch has three pin terminals and a movable contact that allows switching between two circuits. By physically moving the internal contacts to change the circuit connection path, the working state or power output of the appliance is controlled. For example, in household appliances such as electric hot pots, such a switch can simply select two preset heating powers. The first position may be suitable for keeping warm, while the second position provides higher heat for quickly heating food.

[0003] When using a toggle switch, when the moving contact is quickly separated from one of the pins, the distance between the contacts increases rapidly, while the circuit voltage remains unchanged, causing the electric field strength to increase sharply. Neutral protons in the air will be pulled out by the strong electric field force, ionized, and form an arc, causing an electric spark. When the moving contact is quickly in contact with one of the pins, a high dynamic contact resistance may occur due to incomplete or uneven physical contact, resulting in local heating, which may also cause an electric spark. At the same time, there will be friction and mechanical collision forces between the moving contact and the pin during rapid movement. Friction may not only cause wear on the contact surface, but also cause local temperature rise, thereby promoting the formation of an arc. Mechanical collision may cause the contact to bounce slightly or make non-one-time stable contact. This unstable process may promote the formation of sparks in a short period of time. In summary, the rapid separation or contact of the moving contact will increase the probability of an arc.

[0004] Long-term or frequent arc discharge will not only cause the contact surface material to evaporate, melt or oxidize, thereby increasing the contact resistance, reducing the conductivity of the switch and shortening its service life. In addition, the high temperature generated by the arc will cause the surrounding flammable materials to be ignited, causing fire or explosion. The explosion-proof distribution box is an electrical equipment specially designed for use in potentially flammable and explosive environments, so the risk of fire or explosion is greater. Therefore, it is urgent to develop a toggle switch mechanism for the explosion-proof distribution box, which can reduce the probability of arcing through slow and smooth switching operations and reduced friction contact. Summary of the invention

[0005] In order to overcome the disadvantage that arc phenomenon is more likely to occur when the toggle switch switches pins quickly, the present invention provides a toggle switch mechanism for an explosion-proof distribution box.

[0006] A toggle switch mechanism for an explosion-proof distribution box comprises a mounting shell, the mounting shell being rotatably connected to a toggle arm, the mounting shell being fixedly connected to a plurality of pins, the mounting shell being slidably connected to a toggle frame for limiting cooperation with the toggle arm, the toggle frame being fixedly connected to a moving contact piece, the moving contact piece being in contact with the adjacent pins, the mounting shell being slidably connected to a sliding frame symmetrically distributed along the mounting shell, the toggle frame being moved and in contact with the sliding frame, the sliding frame being rotatably connected to spring pieces symmetrically distributed along the sliding frame, the sliding frame being fixedly connected to an insulating top block, the insulating top block being in contact with the moving contact piece, the spring piece being rotatably connected to a support block, and the support block being fixedly connected to the mounting shell.

[0007] Optionally, it also includes a first connecting frame corresponding to the sliding frame, the first connecting frame is fixedly connected to the corresponding sliding frame, the mounting shell is fixedly connected to a guide frame symmetrically distributed along the mounting shell, the guide frame is slidably connected to the adjacent first connecting frame, the first connecting frame is slidably connected to a pressure frame for pressing the moving contact piece downward, and an elastic member symmetrically distributed along the pressure frame is fixedly connected between the pressure frame and the adjacent first connecting frame.

[0008] Optionally, the pressing frame is made of insulating material.

[0009] Optionally, it further includes a support plate symmetrically distributed along the toggle frame, the support plate is slidably connected to the toggle frame, and a plurality of telescopic components are fixedly connected between the support plate and the toggle frame.

[0010] Optionally, a plurality of friction wheels are further included, wherein the friction wheels are rotatably connected to the abutment plate, and the friction wheels are in contact with the mounting shell.

[0011] Optionally, it also includes an insulating movable plate which is symmetrically distributed front and back along the middle pin, the insulating movable plate is slidably connected to the middle pin, the mounting shell is fixedly connected to a support frame symmetrically distributed along the mounting shell, the insulating movable plate is fixedly connected to a second connecting frame symmetrically distributed along the insulating movable plate, the support frame is slidably connected to the second connecting frame adjacent to the same side, tension springs symmetrically distributed along the support frame are fixedly connected between adjacent second connecting frames, and the toggle frame is fixedly connected to a top frame symmetrically distributed along the toggle frame.

[0012] Optionally, a side of the insulating movable plate close to the second connecting frame is configured as an inclined surface.

[0013] Optionally, the insulating movable plate is provided with protrusions symmetrically distributed along the insulating movable plate, and the top frame is pressed and matched with the protrusions of the insulating movable plate on the same side.

[0014] Optionally, it also includes a hole plate symmetrically distributed along the installation shell, the hole plate is fixed to the installation shell, the toggle frame is fixed with a guide cylinder symmetrically distributed along the toggle frame, and a top bead for limiting the position on the hole plate is fixed in the guide cylinder through a spring.

[0015] Optionally, the orifice plate is provided with limiting holes distributed in a straight line, and the top ball is limitedly matched with the limiting holes of the orifice plate on the same side.

[0016] The beneficial effects of the present invention are: 1. The present invention utilizes an insulating top block to first elastically lift the moving contact piece upward, and then gently lowers the moving contact piece vertically onto the pin, so that the moving contact piece can slowly, smoothly, and frictionlessly contact or disconnect when disconnecting and contacting, avoiding local temperature rise and contact point bouncing, thereby reducing the probability of arc occurrence and reducing the risk of fire or explosion.

[0017] 2. When the insulating top block lowers the movable contact piece to contact the side pin, the pressure frame presses the movable contact piece down onto the side pin at the same time, so that the movable contact piece is closely attached to the contacting pin, reducing the probability of electric spark caused by poor contact.

[0018] 3. The present invention presses the friction wheel against the inner wall of the mounting shell through the abutment plate, so that the toggle frame and the movable contact piece move slowly as a whole, and further reduces the probability of electric sparks by slowing down the speed of the switching action.

[0019] 4. The movable contact piece of the present invention contacts the top of the insulating movable plate during the moving and switching process instead of directly contacting the top of the middle pin, thereby reducing possible damage and electric sparks on the contact surface due to friction.

[0020] 5. The present invention limits the position of the toggle frame and the movable contact piece by inserting the top ball into the corresponding limit hole, thereby preventing the shaking caused by external factors from causing the generation of electric sparks. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0022] Figure 2 The present invention is a three-dimensional structural schematic diagram of components such as a housing, a toggle arm and pins.

[0023] Figure 3 This is a three-dimensional structural separation diagram of the components such as the toggle arm, the pin and the toggle frame of the present invention.

[0024] Figure 4 It is a three-dimensional structural schematic diagram of components such as the movable contact piece, the sliding frame and the spring piece of the present invention.

[0025] Figure 5It is a three-dimensional structural schematic diagram of components such as the spring piece, the insulating top block and the supporting block of the present invention.

[0026] Figure 6 It is a three-dimensional structural schematic diagram of the guide frame, the pressure frame and other components of the present invention.

[0027] Figure 7 It is a three-dimensional structural schematic diagram of the guide frame, the pressure frame, the elastic member and other components of the present invention.

[0028] Figure 8 It is a three-dimensional structural schematic diagram of the components such as the abutment plate, the telescopic assembly and the mounting shell of the present invention.

[0029] Fig. 9 It is a three-dimensional structural schematic diagram of the components such as the abutment plate, the telescopic assembly and the toggle frame of the present invention.

[0030] Fig.10 It is a three-dimensional structural schematic diagram of the insulating movable plate, the support frame, the tension spring and other components of the present invention.

[0031] Fig.11 It is a three-dimensional structural schematic diagram of components such as the tension spring and the top frame of the present invention.

[0032] Fig.12 It is a three-dimensional structural schematic diagram of the orifice plate, guide cylinder, pins and other components of the present invention.

[0033] Fig.13 It is a three-dimensional structural schematic diagram of the guide cylinder, top ball, spring and other components of the present invention.

[0034] Explanation of the reference numerals: 1_installing shell, 11_sliding arm, 12_pin, 13_sliding frame, 14_moving contact piece, 15_sliding frame, 16_spring, 17_insulating top block, 18_support block, 2_first connecting frame, 21_guide frame, 22_pressing frame, 23_elastic member, 3_resistance plate, 31_telescopic assembly, 32_friction wheel, 4_insulating moving plate, 41_support frame, 42_tension spring, 43_second connecting frame, 44_top frame, 5_hole plate, 51_guide cylinder, 52_top bead, 53_spring. DETAILED DESCRIPTION

[0035] The following descriptions are merely preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention.

[0036] Embodiment 1: A toggle switch mechanism of an explosion-proof distribution box, combined with the attached Figure 1 To Attachment Figure 5, including an installation shell 1, the upper part of the installation shell 1 is rotatably connected to a toggle arm 11, the lower part of the installation shell 1 is fixedly connected with three pins 12 from left to right, the installation shell 1 is slidably connected to a toggle frame 13 for limiting cooperation with the toggle arm 11 along the left and right directions, a moving contact piece 14 is fixedly connected to the bottom of the toggle frame 13, one side of the moving contact piece 14 contacts with the middle pin 12, and the other side of the moving contact piece 14 contacts with the left or right pin 12, the front and rear sides of the inner wall of the installation shell 1 are slidably connected to sliding frames 15 symmetrically distributed along the left and right sides of the installation shell 1, the toggle frame 13 moves horizontally to contact the sliding frame 15, the upper part of the sliding frame 15 is rotatably connected to a spring piece 16 symmetrically distributed along the left and right sides of the sliding frame 15, the lower part of the sliding frame 15 is fixedly connected to an insulating top block 17, the insulating top block 17 contacts with the moving contact piece 14, the lower part of the spring piece 16 is rotatably connected to a support block 18, and the support block 18 is fixed to the installation shell 1.

[0037] When the toggle arm 11 is toggled to the left, the toggle arm 11 drives the toggle frame 13 to move to the left, thereby driving the moving contact piece 14 to separate from the pin 12 on the right side and to contact the pin 12 on the left side.

[0038] In the above process, the toggle frame 13 first moves to the left and disengages from the sliding frame 15 on the right. At this time, the spring piece 16 in the deformed state is reset, so that the sliding frame 15 on the right slides upward along the inner wall of the mounting shell 1, thereby driving the insulating top block 17 on the right to move upward, so that the lower right side of the moving contact piece 14 is elastically lifted upward, thereby separating the moving contact piece 14 from the top surface of the pin 12 on the right. Subsequently, the movable contact piece 14 moves to the left again until it contacts the insulating top block 17 on the left, and is elastically squeezed upward by the insulating top block 17 on the left, so that the lower left part of the movable contact piece 14 is supported to the top of the insulating top block 17 on the left, and the toggle frame 13 moves to the left again until it contacts the sliding frame 15 on the left. Under the squeezing effect of the toggle frame 13, the sliding frame 15 on the left slides downward along the inner wall of the mounting shell 1, and the spring piece 16 on the left is compressed and deformed. In this way, the sliding frame 15 on the left drives the insulating top block 17 on the left to move downward, so that the left side of the movable contact piece 14 moves downward until it contacts the top surface of the left pin 12.

[0039] Similarly, when the toggle arm 11 is toggled to the right, the toggle arm 11 drives the toggle frame 13 to move to the right, thereby driving the moving contact piece 14 to separate from the pin 12 on the left and contact with the pin 12 on the right.

[0040] In summary, the present invention utilizes the insulating top block 17 to first elastically lift the movable contact piece 14 upward, and then slightly lowers the movable contact piece 14 vertically onto the pin 12, so that the movable contact piece 14 can slowly, smoothly and frictionlessly contact or disconnect when disconnecting and contacting, avoiding local temperature rise and contact point bouncing, thereby reducing the probability of arc occurrence and reducing the risk of fire or explosion.

[0041] Embodiment 2: Based on embodiment 1, Figure 6 To Attachment Figure 7 , and also includes a first connecting frame 2 corresponding to the sliding frame 15, the first connecting frame 2 is fixedly connected to the corresponding sliding frame 15, and the front and rear sides of the inner wall of the mounting shell 1 are fixedly connected with guide frames 21 symmetrically distributed along the mounting shell 1, the guide frame 21 is slidably connected to the adjacent first connecting frame 2, and the lower part of the first connecting frame 2 is slidably connected to a pressing frame 22 along the up and down directions. The pressing frame 22 is set to an insulating material. The pressing frame 22 is used to press the moving contact piece 14 downward so that the moving contact piece 14 is close to the side pin 12, and an elastic member 23 symmetrically distributed along the front and back of the pressing frame 22 is fixedly connected between the pressing frame 22 and the adjacent first connecting frame 2.

[0042] The sliding frame 15 moves up and down, driving the first connecting frame 2 to move up and down along the guide frame 21. The first connecting frame 2 drives the pressing frame 22 and the elastic member 23 to move up and down together. When the insulating top block 17 lowers the movable contact piece 14 to contact the side pin 12, the pressing frame 22 presses the movable contact piece 14 downward on the side pin 12 at the same time, so that the movable contact piece 14 is closely attached to the contacting pin 12, reducing the probability of electric sparks caused by poor contact.

[0043] Combined with Figure 8 To Attachment Fig. 9 , and also includes a support plate 3 symmetrically distributed along the toggle frame 13, the support plate 3 is slidably connected to the toggle frame 13, a plurality of telescopic components 31 are fixedly connected between the support plate 3 and the toggle frame 13, and a plurality of friction wheels 32 are rotatably connected to the outer side of the support plate 3, and the friction wheel 32 rolls along the inner wall of the mounting shell 1.

[0044] During switching, when the toggle frame 13 moves to the left or right, the abutment plate 3, the telescopic assembly 31 and the friction wheel 32 move synchronously. Under the action of the telescopic assembly 31, the abutment plate 3 presses the friction wheel 32 against the inner wall of the mounting shell 1, so that the toggle frame 13 and the moving contact piece 14 move slowly as a whole. In this way, by slowing down the speed of the switching action, the probability of electric sparks being generated is further reduced.

[0045] Combined with Fig.10 To Attachment Fig.11, also includes an insulating movable plate 4 symmetrically distributed along the middle pin 12, there are four insulating movable plates 4, the insulating movable plate 4 is slidably connected to the middle pin 12, the front and rear sides of the inner bottom wall of the mounting shell 1 are fixedly connected with support frames 41 symmetrically distributed along the mounting shell 1, the insulating movable plate 4 is fixedly connected with a second connecting frame 43 symmetrically distributed along the insulating movable plate 4, and the side of the insulating movable plate 4 close to the second connecting frame 43 is set as an inclined surface, so as to facilitate the elastic movement of the movable contact piece 14 to the top of the insulating movable plate 4, the support frame 41 is slidably connected to the adjacent second connecting frame 43 on the same side, and the adjacent second connecting frames 43 are fixedly connected with tension springs symmetrically distributed along the support frame 41, and the middle of the bottom of the toggle frame 13 is fixedly connected with a top frame 44 symmetrically distributed along the toggle frame 13, the insulating movable plate 4 is provided with protrusions symmetrically distributed along the insulating movable plate 4, and the top frame 44 is squeezed and matched with the protrusion of the insulating movable plate 4 on the same side.

[0046] The top frame 44 moves left and right synchronously with the toggle frame 13. When the top frame 44 is located at the protrusion of the insulating movable plate 4, the movable contact piece 14 contacts one of the pins 12 on the left and right sides, and the insulating movable plate 4 is stretched open by the top frame 44. The insulating movable plate 4 drives the second connecting frame 43 to be stretched open, so that the tension spring 42 is in a stretched state. When the top frame 44 moves away from the protrusion of the insulating movable plate 4, the tension spring 42 resets and drives the second connecting frame 43 to move toward each other, thereby driving the two adjacent insulating movable plates 4 to move toward each other and contact each other. In this way, the movable contact piece 14 contacts the top of the insulating movable plate 4 during the moving and switching process, instead of directly contacting the top of the middle pin 12, thereby reducing the damage and electric spark phenomenon that may be caused by friction on the contact surface.

[0047] Combined with Fig.12 To Attachment Fig.13 , and also includes a hole plate 5 symmetrically distributed along the front and back of the installation shell 1, the hole plate 5 is fixedly connected to the upper inner wall of the installation shell 1, and the front and rear sides of the upper part of the toggle frame 13 are fixedly connected to guide cylinders 51 symmetrically distributed along the left and right of the toggle frame 13, and a top ball 52 is fixed in the guide cylinder 51 through a spring 53. The hole plate 5 has limiting holes distributed in a straight line, and the top ball 52 is limitedly matched with the limiting holes of the hole plate 5 on the same side.

[0048] The toggle frame 13 moves left and right, driving the guide cylinder 51, the top ball 52 and the spring 53 to move synchronously. When the movement stops, the top ball 52 is aligned with the limit hole at the corresponding position of the orifice plate 5. Under the elastic force of the spring 53, the top ball 52 is inserted into the corresponding limit hole, thereby limiting the toggle frame 13 and then limiting the moving contact piece 14 to prevent the shaking caused by external factors from causing the generation of electric sparks.

[0049] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A toggle switch mechanism for an explosion-proof distribution box, comprising a mounting shell (1), the mounting shell (1) being rotatably connected to a toggle arm (11), the mounting shell (1) being fixedly connected to a plurality of pins (12), the mounting shell (1) being slidably connected to a toggle frame (13) for limited engagement with the toggle arm (11), the toggle frame (13) being fixedly connected to a moving contact piece (14), the moving contact piece (14) being in contact with the adjacent pins (12), characterized in that: The invention also comprises a sliding frame (15) symmetrically distributed along the mounting shell (1), the sliding frame (15) being slidably connected to the mounting shell (1), the toggle frame (13) moving to contact the sliding frame (15), the sliding frame (15) being rotatably connected to a spring sheet (16) symmetrically distributed along the sliding frame (15), the sliding frame (15) being fixedly connected to an insulating top block (17), the insulating top block (17) being in contact with the moving contact sheet (14), the spring sheet (16) being rotatably connected to a support block (18), and the support block (18) being fixedly connected to the mounting shell (1); When the toggle arm (11) is toggled to the left, the toggle arm (11) drives the toggle frame (13) to move to the left, thereby driving the movable contact piece (14) to disengage from the right pin (12) and to contact the left pin (12). The toggle frame (13) moves to the left and first disengages from the right sliding frame (15). At this time, the spring piece (16) in a deformed state is reset, so that the right sliding frame (15) slides upward along the inner wall of the mounting shell (1), thereby driving the right insulating top block (17) to move upward, so that the lower right side of the movable contact piece (14) is elastically lifted upward, so that the movable contact piece (14) is disengaged from the top surface of the right pin (12), and the movable contact piece (14) is moved to the left. (14) then moves to the left until it contacts the insulating top block (17) on the left, and is elastically pressed upward by the insulating top block (17) on the left, so that the lower left side of the movable contact piece (14) is supported to the top of the insulating top block (17) on the left, and the toggle frame (13) then moves to the left until it contacts the sliding frame (15) on the left, and under the pressing action of the toggle frame (13), the sliding frame (15) on the left slides downward along the inner wall of the mounting shell (1), and the elastic sheet (16) on the left is compressed and deformed, so that the sliding frame (15) on the left drives the insulating top block (17) on the left to move downward, so that the left side of the movable contact piece (14) moves downward until it contacts the top surface of the pin (12) on the left; When the toggle arm (11) is toggled to the right, the toggle arm (11) drives the toggle frame (13) to move to the right, thereby driving the movable contact piece (14) to disengage from the pin (12) on the left side and to contact the pin (12) on the right side.

2. A toggle switch mechanism for an explosion-proof distribution box according to claim 1, characterized in that: The invention also comprises a first connecting frame (2) corresponding to the sliding frame (15), the first connecting frame (2) being fixedly connected to the corresponding sliding frame (15), the mounting shell (1) being fixedly connected to a guide frame (21) symmetrically distributed along the mounting shell (1), the guide frame (21) being slidably connected to the adjacent first connecting frame (2), the first connecting frame (2) being slidably connected to a pressing frame (22) for pressing the movable contact piece (14) downward, and an elastic member (23) symmetrically distributed along the pressing frame (22) being fixedly connected between the pressing frame (22) and the adjacent first connecting frame (2).

3. A toggle switch mechanism for an explosion-proof distribution box according to claim 2, characterized in that: The pressing frame (22) is made of insulating material.

4. A toggle switch mechanism for an explosion-proof distribution box according to claim 3, characterized in that: It also includes a support plate (3) symmetrically distributed along the toggle frame (13), the support plate (3) being slidably connected to the toggle frame (13), and a plurality of telescopic components (31) being fixedly connected between the support plate (3) and the toggle frame (13).

5. The toggle switch mechanism of an explosion-proof distribution box according to claim 4, characterized in that: It also includes a plurality of friction wheels (32), wherein the friction wheels (32) are rotatably connected to the abutment plate (3), and the friction wheels (32) are in contact with the mounting housing (1).

6. A toggle switch mechanism for an explosion-proof distribution box according to claim 5, characterized in that: It also includes an insulating movable plate (4) symmetrically distributed along the middle pin (12), the insulating movable plate (4) being slidably connected to the middle pin (12), the mounting shell (1) being fixedly connected to a support frame (41) symmetrically distributed along the mounting shell (1), the insulating movable plate (4) being fixedly connected to a second connecting frame (43) symmetrically distributed along the insulating movable plate (4), the supporting frame (41) being slidably connected to the second connecting frame (43) adjacent to the same side, tension springs (42) symmetrically distributed along the supporting frame (41) being fixedly connected between adjacent second connecting frames (43), and the toggle frame (13) being fixedly connected to a top frame (44) symmetrically distributed along the toggle frame (13).

7. A toggle switch mechanism for an explosion-proof distribution box according to claim 6, characterized in that: A side of the insulating movable plate (4) close to the second connecting frame (43) is arranged as an inclined surface.

8. The toggle switch mechanism of an explosion-proof distribution box according to claim 7, characterized in that: The insulating movable plate (4) is provided with protrusions symmetrically distributed along the insulating movable plate (4), and the top frame (44) is pressed and matched with the protrusions of the insulating movable plate (4) on the same side.

9. The toggle switch mechanism of an explosion-proof distribution box according to claim 8, characterized in that: It also includes an orifice plate (5) symmetrically distributed along the mounting shell (1), the orifice plate (5) being fixedly connected to the mounting shell (1), the toggle frame (13) being fixedly connected to a guide cylinder (51) symmetrically distributed along the toggle frame (13), and a top bead (52) for limiting the position on the orifice plate (5) being fixedly connected in the guide cylinder (51) via a spring (53).

10. A toggle switch mechanism for an explosion-proof distribution box according to claim 9, characterized in that: The orifice plate (5) is provided with limiting holes distributed in a straight line, and the top ball (52) is in limiting cooperation with the limiting holes of the orifice plate (5) on the same side.

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