A modular power distribution cabinet

Abstract

The present invention relates to the field of electric power equipment, and specifically to a modular power distribution cabinet, comprising: a distribution cabinet, an installation box, a handle, a sleeve contact, a cylindrical contact and a rotating separation mechanism, and also comprising: a delayed conductive device, wherein the delayed conductive device is installed at the interlayer formed between the installation box and the distribution cabinet body, the delayed conductive device comprises a connecting frame and a delayed pushing mechanism for pushing the connecting frame to move, one side of the connecting frame is fixedly installed with the cylindrical contact, and the delayed pushing mechanism drives the cylindrical contact to slowly contact with the sleeve contact through the connecting frame; the delayed pushing mechanism of the present invention pushes the connecting frame to move slowly, and the connecting frame drives the cylindrical contact to slowly contact with the sleeve contact, so that when the installation box enters the distribution cabinet for power-on, the circuit in the installation box will slowly be connected with the main circuit, so that maintenance personnel have time to evacuate to a safe position, thereby increasing the safety of the modular distribution cabinet when in use.

Description

Technical Field

[0001] The present invention relates to the field of electric power equipment, in particular to a modular power distribution cabinet. Background Art

[0002] The power distribution cabinet is a type of distribution box and is the final equipment of the distribution system. The distribution cabinet assembles switchgear, measuring instruments, protective electrical appliances and auxiliary equipment in a closed or semi-closed metal cabinet or on a screen according to the electrical wiring requirements to form a low-voltage distribution device.

[0003] Power distribution cabinets are widely used, which increases the risk of electric shock to humans. When operators maintain, repair, and replace equipment on drawer-type modular power distribution cabinets, because it is a modular power distribution cabinet, they only need to open the drawer of the corresponding module and close the distribution cabinet after the maintenance is completed, so that the entire maintenance process will not affect other drawer modules in the power distribution cabinet, so that the equipment in other drawers can still work normally. However, the operator needs to contact the corresponding drawer box during the entire maintenance process, which makes the operator prone to electric shock accidents.

[0004] In order to ensure the safety of power system maintenance operations and reduce the occurrence of electric shock accidents, it is generally adopted to install a rotating separation mechanism on the power distribution cabinet drawer to protect the operator from the danger of electric shock or induction arc. When opening the drawer alone for maintenance and inspection, the operator holds the handle and rotates the handle to open the safety lock on the drawer. At the same time, the separation mechanism separates the drawer from the main circuit to ensure the safety of the operator. However, when the drawer is put back to the operating position, the separation circuit usually generates an arc (a ball of extremely high temperature, emitting strong light and conductive gas in a cylindrical shape) in the contact gap in a short period of time, which may cause harm to the operator. To prevent danger, an arc detection protection system and an arc extinguishing device are used to protect the operator. The arc detection protection system (Li Kun, Research on the detection method of series fault arc [D]. Liaoning: Liaoning University of Engineering and Technology, 2014.) can prevent the arc from occurring in advance and protect the operator's safety. The system can accurately extract the characteristic signal of arc discharge and close the circuit when the arc is generated. The arc can be quickly extinguished by the arc extinguishing device, but at the moment the arc is generated, it will still come into contact with the body and may cause electric shock or produce high-temperature melting handles to indirectly burn the human body, which makes it easy for operators to have safety accidents when repairing the distribution cabinet.

[0005] To this end, a modular power distribution cabinet is proposed. After closing the installation box, the circuit inside the cabinet is slowly connected to the main circuit, so that maintenance personnel have time to move away from the distribution cabinet and reach a safe location, thereby reducing the probability of safety accidents when repairing the distribution cabinet. Summary of the invention

[0006] The purpose of the present invention is to provide a modular power distribution cabinet, which pushes the connecting frame to move slowly through a delayed pushing mechanism, and the connecting frame drives the cylindrical contact to slowly contact the sleeve contact, so that when the installation box enters the distribution cabinet body and is energized, the circuit in the installation box will slowly be connected to the main circuit, allowing maintenance personnel to have time to evacuate to a safe position, thereby increasing the safety of the modular distribution cabinet when in use.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A modular power distribution cabinet, comprising:

[0009] A distribution cabinet body is provided with a plurality of installation boxes, each of the installation boxes is rotatably connected to a handle, each of the installation boxes is electrically connected to a sleeve contact and a cylindrical contact, a rotation separation mechanism is provided on the handle, and the handle includes two states, open and closed. When the handle is in the open or closed state, the rotation separation mechanism pushes the sleeve contact and the cylindrical contact to move closer to or away from each other.

[0010] It should be noted that the rotating separation mechanism includes a transmission groove provided on the mounting box, in which a third gear is rotatably connected, and the rotating shaft of the third gear is fixedly installed with the handle. A transmission groove is provided at the bottom of the mounting box, in which a transmission rod is rotatably connected, and second gears are fixedly installed at both ends of the transmission rod, and one of the second gears is meshed with the third gear. A rotating sleeve mounted on the sleeve contact is rotatably connected on the inner wall of the mounting box, and a gear ring meshed with another second gear is fixedly installed on the rotating sleeve. A plurality of circumferentially distributed pushing grooves are provided on the side wall of the rotating sleeve, and a moving column fixedly installed with the sleeve contact is slidably connected in the pushing groove, and a dust cover for protecting the rotating sleeve and the gear is fixedly installed on the inner wall of the mounting box.

[0011] When it is necessary to open the installation box for inspection and maintenance, the handle is rotated downward, and the rotating handle drives the third gear connected to it to rotate, and the rotating third gear drives one of the meshing second gears to rotate, and the rotating second gear drives the second gear on the other side to rotate through the fixed transmission rod, and the rotation of the second gear on the other side drives the meshing gear ring to rotate, and the rotating gear ring drives the rotating sleeve fixed to it to rotate, and when the rotating sleeve rotates, it drives the pushing groove provided on it to rotate. Because a moving column is placed in the pushing groove, when the pushing groove rotates, it drives the moving column to move to one side, and the moving column is fixed on the sleeve contact, causing the sleeve contact to move to one side away from the cylindrical contact, so that the circuit in the installation box is separated from the main power supply, and the power in the installation box is cut off. At this time, the operator can inspect the pulled out installation box. Of course, after the inspection is completed, the installation box is pushed into the distribution cabinet body. At this time, when the handle is rotated upward, the sleeve contact and the cylindrical contact contact the circuit and conduction.

[0012] Among them, a safety lock installed on the installation box is provided on one side of the handle. When the handle is rotated downward to make the sleeve contact away from the cylindrical contact to cut off the power, the handle drives the safety lock to operate to open the corresponding installation box. When the handle is rotated upward, the rotating handle drives the safety lock to operate to close the corresponding installation box. The safety lock makes it possible to close or open the installation box only by rotating the handle, thereby increasing safety during maintenance.

[0013] It also includes: a delayed conduction device, which is installed in the interlayer formed between the installation box and the distribution cabinet body, and the delayed conduction device includes a connecting frame and a delayed pushing mechanism for pushing the connecting frame to move, one side of the connecting frame is fixedly installed with the cylindrical contact, and the delayed pushing mechanism drives the cylindrical contact to slowly contact the sleeve contact through the connecting frame, and a stable reset component abutting the connecting frame is slidably connected to the cylindrical contact, and the stable reset component drives the delayed pushing mechanism to return to its original position through the connecting frame, and a locking component is connected to the rotating separation mechanism, and when the handle is in an open state, the locking component locks the connecting frame and the cylindrical contact in a position separated from the sleeve contact.

[0014] Because the sleeve contact and the cylindrical contact are in a relative sliding state, the handle can only drive the sleeve contact to move by rotating the separation mechanism. When the cylindrical contact is in the original position, the metal contact inside the sleeve contact moves to contact the metal contact on the cylindrical contact. However, because the delay push mechanism is fixed to the cylindrical contact through the connecting frame, the cylindrical contact is far away from the original position, so that the sleeve contact and the cylindrical contact still cannot contact each other after the handle is rotated, and the circuit cannot be connected to the main power supply. Only when the delay push mechanism is running can the cylindrical contact be moved to the original position. Therefore, only when the delay push mechanism and the handle are running at the same time can the circuit in the installation box be connected to the main power supply, thereby preventing the operator from turning the handle by mistake, causing the circuit to be connected and causing a safety accident.

[0015] By controlling the circuit to be turned on and off at a fixed time through a high-voltage time delay relay, the circuit on and off time can be accurately controlled. However, because the high-voltage time delay relay also needs to be powered during operation, it is necessary to install another set of transformer equipment to provide power for the time delay relay. At the same time, an arc will be generated when the circuit is turned on, making the high-voltage time delay relay easily destroyed. The damaged high-voltage time delay relay needs to be replaced in time. When the high-voltage time delay relay is damaged and the operator does not check it in time, the high-voltage time delay relay is still in the on state and cannot play a protective role.

[0016] Preferably, the delayed pushing mechanism includes a piston cylinder arranged on the outside of the installation box, a support frame for supporting the piston cylinder is fixedly mounted on the installation box, a piston plate is slidably connected in the piston cylinder, a push rod extending to the outside of the piston cylinder and connected to the connecting frame is fixedly mounted on one side of the piston plate, and a piston rod is fixedly mounted on the other side of the piston plate, and two extrusion plates located on the same central axis are provided at one end of the piston cylinder away from the push rod, a telescopic rod is fixedly mounted between the two extrusion plates, a first compression spring connected to the extrusion plates on both sides is sleeved on the telescopic rod, the piston rod extends to the outside of the piston cylinder and is fixedly mounted on one of the extrusion plates, and the other extrusion plate abuts against the inner wall of the distribution cabinet body when the installation box is located in the distribution cabinet body, an air outlet is opened at one end of the piston cylinder close to the push rod, and the diameter ratio of the piston cylinder to the air outlet is: 10:1.

[0017] When the installation box is pushed into the main body of the distribution cabinet, the extrusion plate is in contact with the inner wall of the distribution cabinet, so the extrusion plate will push the piston rod to move through the first compression spring, and the moving piston rod will drive the connected piston plate to move. Because the aperture ratio of the air outlet is 10:1, the piston plate cannot move quickly to the other side, so that the two extrusion plates will squeeze the first compression spring in the middle to shrink the telescopic rod. At this time, the installation box has been pushed into the main body of the distribution cabinet. Because the cylindrical contact is not in the original position at this time, the circuit in the installation box is still disconnected. At this time, the operator can leave the distribution cabinet and return to the safe area. At this time, the piston plate will be pushed to move by the compressed first compression spring. Assume that the gas density in the piston cylinder is ρ, the gas velocity flowing through the circular hole is v, and the gas flow rate flowing out through the circular hole is Q (m 3 / s). According to the continuity equation, Q = Av, where A is the area of ​​the circular hole. For an ideal gas, PV = nRT, where P is the gas pressure, V is the gas volume, n is the number of gas moles, R is the gas constant, and T is the absolute temperature of the gas. After rearranging, we can get v = sqrt(2(P1-P2) / ρ). At room temperature (about 20°C), the gas density ρ can be regarded as a constant (about 1.2 kg / m 3 ), where P1 is the initial gas pressure in the piston cylinder, and P2 is the gas pressure after the pressure drops rapidly after passing through the circular hole. Assuming that the mass of the piston block is small, its effect on the gas flow can be ignored. Therefore, the circular hole area S is inversely proportional to the gas velocity v. It is necessary to calculate the required circular hole area to piston cylinder area ratio based on the actual gas pressure and the expected piston block movement speed to achieve the best slow movement effect.

[0018] The delayed pushing mechanism also includes a damping rod fixedly installed on the outside of the mounting box, the movable end of the damping rod is fixedly installed on the connecting frame, and the movable end of the resistance rod is fixedly installed on the extrusion plate. The movable end of the damping rod is pushed to move slowly by the compressed first compression spring. However, the resistance rod can only adjust its position when it starts to move slowly during use, and cannot adjust the speed of the slow movement of the resistance rod, or speed up the recovery speed of the resistance rod. At the same time, the resistance rods are all in a sealed state, and the viscosity and pressure of the sealed liquid or gas are greatly affected by temperature. Therefore, in high or low temperature environments, the effect of the damping rod will be affected to a certain extent. Of course, if there is no requirement for the moving speed and recovery speed of the delayed pushing mechanism, a damping rod can be selected.

[0019] Among them, a plurality of vent holes are opened on the side of the piston cylinder close to the extrusion plate, so that the piston plate will not be affected by the air pressure on the other side.

[0020] Of course, the entire delay push mechanism can be fixed on the cylindrical contact, the push rod and the cylindrical contact are fixedly installed, and the connecting frame can be directly removed, which can also make the device operate normally. Of course, it will cause the overall length of the cylindrical contact plus the delay push mechanism to be too long. Although the width of the interlayer can be adjusted, it will lead to a reduction in the internal area of ​​the installation box, which is not conducive to the installation and heat dissipation of electrical components in the installation box.

[0021] The piston cylinder is provided with an air inlet hole, an air inlet pipe is installed on the air inlet hole, a one-way valve is installed on the air inlet pipe to allow air to enter the air inlet hole only, and the aperture of the air inlet hole is larger than the aperture of the air outlet hole.

[0022] When the above-mentioned air inlet hole and one-way valve are not present, the piston block in the piston cylinder will recover very slowly due to the extremely small air intake. When the operator opens the installation box and quickly closes it, the piston block that has not recovered causes the cylindrical contact to remain in the original position or 0 to 1 cm away from the original position. As a result, after the installation box is closed, the cylindrical contact will instantly or briefly contact the sleeve contact, causing the delayed push mechanism to be unable to operate, and the circuit in the installation box to be quickly connected, posing a safety hazard. Therefore, by installing the air inlet pipe and the one-way valve, the piston plate can quickly return to its original position after the operator opens the installation box, reducing the probability of safety accidents caused by operator errors.

[0023] An air outlet pipe is fixedly installed in the air outlet hole, an adjustment block for controlling the air outlet speed is installed on the air outlet pipe, a baffle for controlling the air outlet area of ​​the air outlet pipe is slidably connected in the adjustment block, a threaded hole is opened on the adjustment block, and a threaded knob rotatably connected to the baffle is threaded in the threaded hole.

[0024] Because the air outlet speed of the air outlet pipe is constant, the time it takes for the piston plate to move to the other side of the piston cylinder is constant and cannot be changed. The safety positions designated by different factories are also different, resulting in different triggering times required for each factory. If the triggering time is short, the installation box will be powered on before the operator reaches the safe area. If the triggering time is too long, the operator will become impatient during maintenance due to the long waiting time and will no longer pay attention to the installation box being repaired, causing problems in the power distribution cabinet after the operator leaves.

[0025] When the trigger time needs to be extended, the threaded knob is rotated and moved toward the inside of the adjustment block. The moving threaded knob drives the connected baffle to move, and the moving baffle reduces the pipe opening area of ​​the outlet pipe. For example, when the movement of the piston plate is 0.1 cm / s, the trigger time is extended. When the trigger time needs to be increased, the threaded knob is rotated and moved toward the outside of the adjustment block. The moving threaded knob drives the connected baffle to move, and the moving baffle increases the pipe opening area of ​​the outlet pipe, for example, increasing the movement speed of the piston plate to 0.5 cm / s.

[0026] A filter is installed at the pipe opening of the air inlet pipe and the air outlet pipe away from the piston cylinder. The installed filter prevents dust from entering the piston cylinder through the air inlet pipe and the air outlet pipe, affecting the normal operation and service life of the piston cylinder. The filter is installed at the pipe opening to prevent dust from entering the air inlet pipe and the air outlet pipe and causing pipe blockage.

[0027] The stable reset assembly includes a fixing frame fixedly mounted on the outside of the mounting box, the cylindrical contact is slidably connected to the fixing frame, an insulating ring is fixedly mounted on the cylindrical contact, a second compression spring sleeved on the cylindrical contact is abutted between the fixing frame and the insulating ring, the connecting frame includes two separately arranged heat conducting plates, the two heat conducting plates are respectively connected to the push rod and the insulating ring on both sides, a limiting prism passing through one of the heat conducting plates is fixedly mounted on the outside of the mounting box, a fuse is installed between the two heat conducting plates, when the circuit load is too large and the heat of the cylindrical contact and the sleeve contact reaches a set value, the fuse disconnects the connection between the two heat conducting plates, so that the second compression spring pushes the cylindrical contact away from the sleeve contact.

[0028] When the delayed pushing mechanism drives the cylindrical contact back to the original position through the connecting frame, the delayed pushing mechanism cannot drive the cylindrical contact away from the sleeve contact through the connecting frame after the installation box is opened. At this time, the cylindrical contact will be driven to move when the connecting frame moves, and the moving cylindrical contact squeezes the second compression spring. Because the installation box is located in the distribution cabinet body at this time, and the strength of the second compression spring is not as strong as the first compression spring, the compressed second compression spring cannot push the connecting frame and the cylindrical contact away from the sleeve contact. When the installation box is opened, the compressed second compression spring will push the cylindrical contact away from the sleeve contact and push the piston plate back to its original position.

[0029] The circuit in the installation box is overloaded, causing the heat on the cylindrical contact and the sleeve contact to continue to increase. At this time, the cylindrical contact and the sleeve contact need to be separated to prevent the distribution cabinet from overheating and causing damage to the internal circuit. The problem can be well solved by the fuse and the second compression spring installed on the cylindrical contact. The entire delay push mechanism is fixed on the cylindrical contact, so that the push rod and the cylindrical contact are fixedly installed, and the connecting frame is directly removed, which can also make the device operate normally. Of course, it will cause the overall length of the cylindrical contact plus the delay push mechanism to be too long. Although the width of the interlayer can be adjusted, it will cause the internal area of ​​the installation box to be reduced, which is not conducive to the installation and heat dissipation of electrical components in the installation box. The connecting frame is not only conducive to the distribution of the overall structure, but also can disconnect the connection between the cylindrical contact and the sleeve contact when there is a problem with the circuit.

[0030] The fuse comprises two relatively arranged separation rods, which are respectively fixedly mounted on the heat conducting plates on both sides, one of the separation rods is provided with a groove, and the other separation rod is provided with a protrusion matching with the groove, and the groove and the protrusion are both provided with circular holes, and a hot melt plug is provided in the circular hole.

[0031] The hot melt plug is made of polyvinyl chloride material, and the head of the hot melt plug is an inclined frustum. The temperature at which polyvinyl chloride starts to shrink is about 70-80 degrees Celsius. When the temperature exceeds this range, polyvinyl chloride will shrink, and the thermal shrinkage rate of polyvinyl chloride material is about 1%, and its thermal shrinkage rate will increase with the increase of temperature. Because the round holes on the separation rod are connected, the shrinking hot melt plug will slide out of the round hole due to gravity. Because the installation box is located in the distribution cabinet at this time, the second compression spring on the cylindrical contact is in a compressed state, and the hot melt plug between the two separation rods slips, causing the two separation rods to separate from each other. At this time, the compressed second compression spring will push the cylindrical contact back to its original position, disconnecting the circuit in the installation box and ensuring the safety of the distribution box.

[0032] It should be noted that the insulating ring is made of ceramic material, while the heat conducting plate and the connected separation rod are both made of metal aluminum, because the thermal conductivity of ceramic material and metal aluminum are both optimal, so that the thermal fuse can be quickly heated and dropped.

[0033] The sleeve contact is fixedly mounted with a sliding plate slidably connected to the fixing frame, the fixing frame includes a fixing plate and two ceramic columns supporting it, the ceramic columns are fixed to the mounting box by bolt connection, and the sliding plate slides on the two ceramic columns.

[0034] When the sleeve contact is fixed on the installation box and cannot be moved, the rotating separation mechanism cannot drive the sleeve contact to move when the handle is rotated, so only the cylindrical contact can move. Because when the two conductive contacts are separated and too close, a certain magnetic field and local voltage instability will be generated, so the two contacts need to be separated by a certain distance, and at this time only the cylindrical contact can move, resulting in the cylindrical contact needing to move a distance a, which requires a larger interlayer space, and the total volume of the distribution cabinet is fixed, which makes the volume of the installation box smaller, resulting in more densely installed components inside, affecting the heat dissipation effect.

[0035] When the sleeve contact can be moved through the sliding plate, the sleeve contact and the cylindrical contact are driven to move to both sides at the same time through the rotating separation mechanism and the delayed conductive device. Because the two contacts are separated to both sides, the cylindrical contact needs to move a distance of 0.5a, and the sleeve contact only needs to move into the installation box, which greatly reduces the space at the interlayer. The total volume of the distribution cabinet is constant, which makes the volume of the installation box larger and facilitates the installation of components therein. At the same time, the two contacts are separated from each other, making the operation of the equipment safer. When the heat conduction plate on one side is broken, the cylindrical contact will be close to the sleeve contact. At this time, the circuit will not be connected because the sleeve contact is not in place.

[0036] The surface of the ceramic column is polished and smooth, thereby reducing the friction caused by the sliding plate sliding thereon.

[0037] The locking assembly includes a threaded rod rotatably connected to the inner wall of the installation box, a first gear is fixedly installed on a rotating shaft on one side of the threaded rod, a gear ring meshing with the first gear is fixedly installed on the rotating separation mechanism, a through slide groove is opened on the installation box, a push column abutting the connecting frame is slidably connected in the through slide groove, and a push plate fixedly installed on the push column is threadedly connected to the threaded rod.

[0038] The locking assembly also includes a rotating rod installed on the installation box, the rotating rod is connected to the pushing column, and a threaded rod is installed on the rotating rod. The pushing column is driven to move by rotating the threaded rod. The separately arranged locking assembly can be used at any time, and the locking assembly is more convenient for fixing the connecting frame. However, the separately designed locking assembly is separated from the handle, forming two operation steps, and the operator can easily perform only one step of operation, which reduces the safety of equipment use.

[0039] It should be noted that the first gear is meshed with the gear ring. When the handle rotates through the rotating separation mechanism to drive the sleeve contact away from the cylindrical contact, it drives the first gear to rotate. The rotating first gear drives the threaded rod to rotate. The rotating threaded rod drives the push plate threaded thereon to move. The moving push plate drives the fixed push column to move. The moving push column resists the connecting frame, causing the connecting frame to be unable to move, and the cylindrical contact cannot move to its original position. This ensures that the installation box can only be energized by rotating the handle after being pushed into the distribution cabinet body. Only after completing the two operations will the installation box be energized. Of course, the installation box will be powered on with a delay after the above two operations are completed, thereby increasing the safety of the equipment.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] 1. At the moment when the installation box is pushed into the distribution cabinet body, the distribution cabinet body squeezes the delayed push mechanism to make it operate. Because the delayed push mechanism is a mechanical structure and will not be disturbed by the electric field, it can stably push the cylindrical contact slowly through the connecting frame to move after the installation box is closed. The cylindrical contact slowly moves to the original position and connects with the sleeve contact. The delayed push mechanism slows down the power-on time inside the installation box, allowing the operator time to move to a safe position to avoid the arc causing harm to the operator, thereby increasing the safety of the modular distribution cabinet when in use.

[0042] 2. The handle in the existing power distribution cabinet drives the sleeve contact away from the cylindrical contact through the rotating separation mechanism, so that the circuit in the installation box is disconnected from the main power supply. The present invention cooperates the extrusion delay pushing mechanism with the rotating separation mechanism in the existing power distribution cabinet, so that the operator will not accidentally touch the handle and cause the installation box to be energized when the handle rotates. Only after the installation box is pushed into the power distribution cabinet body and the handle is rotated can the power be slowly turned on, thereby further increasing the safety of the modular power distribution cabinet when in use.

[0043] 3. A locking assembly is installed between the rotating separation mechanism and the delayed pushing mechanism. The installed locking assembly ensures that when the operator pushes the installation box into the distribution cabinet, the delayed pushing mechanism will not start as long as the operator does not rotate the handle to close the installation box, thereby increasing the reliability of the delayed pushing mechanism and preventing the operator from pushing the installation box into the distribution cabinet, resulting in rapid power-on due to delayed rotation of the handle, making it safer for the operator to use the distribution cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0045] Figure 2 It is a schematic diagram of the internal structure of the installation box in the present invention;

[0046] Figure 3It is a schematic diagram of the internal structure of the dust cover in the present invention;

[0047] Figure 4 It is an enlarged structural schematic diagram of the rotating sleeve in the present invention;

[0048] Figure 5 It is an enlarged structural schematic diagram of the connecting frame in the present invention;

[0049] Figure 6 It is a schematic diagram of the internal structure of the piston cylinder in the present invention;

[0050] Figure 7 It is a schematic diagram of the explosion structure of the bushing contact in the present invention;

[0051] Figure 8 It is a schematic diagram of the internal structure of the adjustment block in the present invention;

[0052] Fig. 9 It is a schematic diagram of the power-on and power-off operation in the present invention;

[0053] Fig.10 It is a cross-sectional schematic diagram of the separation rod in the present invention.

[0054] In the figure: 1. distribution cabinet body; 2. installation box; 3. handle; 4. dust cover; 5. extrusion plate; 6. connecting frame; 7. gear ring; 8. first gear; 9. second gear; 10. transmission rod; 11. third gear; 12. threaded rod; 13. push plate; 14. push column; 15. rotating sleeve; 16. sleeve contact; 17. piston cylinder; 18. telescopic rod; 19. first compression spring; 20. cylindrical contact; 21. second compression spring; 22. fixed frame; 23. sliding plate; 24. support frame; 25. adjustment block; 26. threaded knob; 27. exhaust pipe; 28. one-way valve; 29. ​​limiting prism; 30. push rod; 31. piston plate; 32. piston rod; 33. moving column; 34. baffle; 35. separation rod; 36. hot melt plug. DETAILED DESCRIPTION

[0055] The technical solutions in the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings in the present invention.

[0056] Embodiment 1:

[0057] When the installation box 2 needs to be pulled out from the modular distribution cabinet body 1, the handle 3 needs to be rotated, wherein a hole connected to the transmission groove is opened on the installation box 2, and a single-row deep groove ball bearing is installed in the hole. The ball bearing enables the handle 3 to rotate for a long time, and the single-row deep groove ball bearing is cheap and has a wide range of uses. The rotating handle 3 drives the third gear 11 connected thereto to rotate, and the rotating third gear 11 drives one of the meshed second gears 9 to rotate. The rotating second gear 9 drives the second gear 9 on the other side to rotate through the fixed transmission rod 10, and the rotation of the second gear 9 on the other side drives the meshed gear ring 7 to rotate, and the rotating gear ring 7 drives the third gear 11 connected thereto to rotate. The fixed rotating sleeve 15 rotates. When the rotating sleeve 15 rotates, the pushing groove opened thereon is driven to rotate. Because a moving column 33 is placed in the pushing groove, when the pushing groove rotates, the moving column 33 is driven to move to one side. The moving column 33 is fixed on the sleeve contact 16, causing the sleeve contact 16 to move to one side away from the cylindrical contact 20, so that the circuit in the installation box is separated from the main power supply, and the power in the installation box 2 is cut off. At this time, the operator can inspect the pulled out installation box 2. Of course, after the inspection is completed, the installation box 2 is pushed into the distribution cabinet 1. At this time, when the handle 3 is rotated upward, the installation box 2 is closed, and the safety performance of the equipment is increased by the function of powering off when opening the box.

[0058] It should be noted that the handle 3 is mainly made of ABS resin material, which has excellent mechanical properties and extremely good impact strength, so that the handle 3 can be used for a long time without bending or breaking. Of course, it has good electrical insulation and is almost unaffected by temperature, humidity and frequency. It can be used in most environments, and the handle 3 reduces the probability of electric shock to the operator.

[0059] Of course, because the overall length of the transmission rod 10 is consistent with the length of the installation box 2, a certain friction force will be generated when the transmission rod 10 rotates in the transmission groove, which is not conducive to the rotation of the transmission rod 10. Therefore, it is necessary to install a bearing in the transmission groove to support the transmission rod 10. Of course, due to the thickness of the bottom of the installation box 2, thick bearings cannot be used, so HRA cross roller bearings are needed. Their compact structure is suitable for small space environments. Of course, the above-mentioned multiple gears are all made of ultra-high molecular weight polyethylene material. Because the gears in the present invention are used less frequently, plastic materials can be used.

[0060] When the installation box 2 is pushed into the distribution cabinet 1, the extrusion plate 5 is in contact with the inner wall of the distribution cabinet 1, so the extrusion plate 5 will push the piston rod 32 to move through the first compression spring 19, and the moving piston rod 32 drives the connected piston plate 31 to move. Because the aperture of the air outlet is 5 mm, the piston plate 31 cannot move quickly to the other side, so that the two extrusion plates 5 will squeeze the first compression spring 19 in the middle, so that the telescopic rod 18 will shrink. At this time, the installation box 2 has been pushed into the distribution cabinet 1. Because the cylindrical contact 20 is not in the original position at this time, the circuit in the installation box 2 is still in a disconnected state. At this time, the operator can leave the distribution cabinet 1 and return to the safe area. At this time, the piston plate 31 will be pushed to move by the compressed first compression spring 19. Because the aperture of the air outlet is small, the piston plate 31 will move slowly. The moving piston plate 31 pushes the push rod 30 to move, and the moving push rod 30 drives the connecting frame 6 to move. The moving connecting frame 6 drives the cylindrical contact 20 to move to the original position, so that it contacts the sleeve contact 16, and the circuit is turned on. After pushing the installation box 2 into the distribution cabinet 1, the installation box 2 can be slowly energized, so that the operator can have enough time to move to a safe position, so that the distribution cabinet 1 will not cause harm to the operator when an accident occurs. At the same time, the operator can also perform emergency treatment on the distribution cabinet 1 in time.

[0061] When the diameter of the piston cylinder is 4 cm, if the piston block is expected to move at a speed of 1 cm / s, the gas pressure in the piston cylinder is 1 atm (101325 Pa), and v = sqrt (2 (P1-P2) / ρ) is used to calculate that the area of ​​the circular hole is about 0.000125 m 2 , the corresponding circular hole diameter is about 0.4cm. It should be noted that due to the low viscosity of air, it can be ignored within a certain range.

[0062] At the same time, the present invention cooperates the extrusion delay pushing mechanism with the power-off device in the existing distribution cabinet 1, so that the operator will not accidentally touch the handle 3 and cause the installation box 2 to be energized when the handle 3 is rotated. Power can only be supplied when the installation box 2 is pushed into the distribution cabinet 1 and the handle 3 is rotated, thereby further increasing the safety of the modular distribution cabinet 1 when in use.

[0063] It should be noted that the support frame 24 is installed on the mounting box 2 by welding, and the piston cylinder 17 is fixed to the support frame 24 by screw connection. The piston cylinder 17 connected by screw connection can be replaced. When the piston cylinder 17 is damaged due to long-term use, the delay push mechanism can continue to operate by replacing the piston cylinder 17. The overall length of the piston cylinder 17 is 6 cm. Of course, the support plate on the support frame 24 is also made of ABS resin material, which can be used for a long time while being insulated. The first compression spring 19 and the second compression spring 21 are both 304 stainless steel springs, and the specifications of the first compression spring 19 are 1mm×30mm×50mm, while the specifications of the second compression spring 21 are 0.25mm×30mm×20mm, so that the overall strength of the first compression spring 19 is greater than that of the second compression spring 21, and the second compression spring 21 can be pushed for extrusion.

[0064] Of course, the piston rod 32 is connected to the extrusion plate 5 by welding. The extrusion plate 5 connected by welding can push the piston plate 31 to move more stably. Of course, an installation groove is opened on the piston plate 31, and a piston ring is installed in the installation groove. The piston ring can be replaced after long-term operation, which is convenient for long-term operation of the entire equipment.

[0065] When the trigger time needs to be extended, the threaded knob 26 is rotated, and the rotating threaded knob 26 moves toward the inside of the adjustment block 25. The moving threaded knob 26 drives the connected baffle 34 to move. The moving baffle 34 reduces the pipe opening area of ​​the air outlet pipe 27, so that the movement of the piston plate 31 is slowed to 0.1 cm / s, resulting in a prolonged trigger time. When the trigger time needs to be increased, the threaded knob 26 is rotated, and the rotating threaded knob 26 moves toward the outside of the adjustment block 25. The moving threaded knob 26 drives the connected baffle 34 to move. The moving baffle 34 increases the pipe opening area of ​​the air outlet pipe 27, so that the movement speed of the piston plate 31 increases to 0.5 cm / s.

[0066] Among them, the baffle 34 for adjusting the outlet speed of the outlet pipe 27 is made of polytetrafluoroethylene material and has good sealing performance, and the connection between the inlet pipe and the outlet pipe 27 and the piston cylinder 17 is coated with HBC-6058 waterproof sealant, so that the connection between the piston cylinder 17 and the inlet pipe and the outlet pipe 27 has good sealing performance. Of course, the inner walls of the inlet pipe and the outlet pipe 27 are mirror-polished.

[0067] In order to make the equipment safer, a locking component is installed on one side of the delayed pushing mechanism. Because when the operator pushes the installation box 2 into the distribution cabinet 1, due to other problems, the operator fails to rotate the handle 3 to lock the installation box 2 within 3 minutes. If the locking component is not installed, the delayed pushing mechanism will fail, causing the operator to rotate the handle 3 after 3 minutes, and the internal circuit of the installation box 2 will be instantly connected. If the locking component is installed, as long as the operator does not rotate the handle 3 to close the installation box 2, the delayed pushing mechanism will not start, thereby increasing the reliability of the delayed pushing mechanism and preventing the operator from pushing the installation box 2 into the distribution cabinet 1. The delayed rotation of the handle 3 causes a rapid power-on result, making it safer for the operator to use the distribution cabinet 1.

[0068] By combining the existing unpacking power-off device with the time-delay push mechanism and the locking assembly of the present invention, the safety of the modular power distribution cabinet 1 is greatly improved.

[0069] The above content has described the embodiments of the present invention. However, those skilled in the art can make various changes, modifications and substitutions to the embodiments based on the understanding of the principles of the present invention. The scope of the present invention is defined by the claims and their related contents.

Claims

1. A modular power distribution cabinet, comprising: A power distribution cabinet body (1), wherein a plurality of installation boxes (2) are installed on the power distribution cabinet body (1), each of the installation boxes (2) is rotatably connected to a handle (3), each of the installation boxes (2) is electrically connected to a sleeve contact (16) and a cylindrical contact (20), and a rotating separation mechanism is installed on the handle (3), wherein the handle (3) includes two states, open and closed, and when the handle (3) is in the open or closed state, the rotating separation mechanism pushes the sleeve contact (16) and the cylindrical contact (20) to move closer to or away from each other; It is characterized by further comprising: A time-delayed conduction device is installed at the interlayer formed between the installation box (2) and the distribution cabinet body (1), and comprises a connecting frame (6) and a time-delayed pushing mechanism for pushing the connecting frame (6) to move. One side of the connecting frame (6) is fixedly installed with the cylindrical contact (20), and the time-delayed pushing mechanism drives the cylindrical contact (20) to slowly contact the sleeve contact (16) through the connecting frame (6). The cylindrical contact (20) is slidably connected with a stable reset component that abuts against the connecting frame (6), and the stable reset component drives the time-delayed pushing mechanism to return to its original position through the connecting frame (6). A locking component is connected to the rotating separation mechanism, and when the handle (3) is in the open state, the locking component locks the connecting frame (6) and the cylindrical contact (20) in a position separated from the sleeve contact (16).

2. A modular power distribution cabinet according to claim 1, characterized in that: The time-delay pushing mechanism comprises a piston cylinder (17) arranged outside the installation box (2); a support frame (24) for supporting the piston cylinder (17) is fixedly mounted on the installation box (2); a piston plate (31) is slidably connected inside the piston cylinder (17); a push rod (30) extending outside the piston cylinder (17) and connected to the connecting frame (6) is fixedly mounted on one side of the piston plate (31); a piston rod (32) is fixedly mounted on the other side of the piston plate (31); and two extrusion plates (5) located on the same central axis are provided at one end of the piston cylinder (17) away from the push rod (30). A telescopic rod (18) is fixedly installed between the two extrusion plates (5), and a first compression spring (19) connected to the extrusion plates (5) on both sides is sleeved on the telescopic rod (18). The piston rod (32) extends to the outside of the piston cylinder (17) and is fixedly installed with one of the extrusion plates (5). When the installation box (2) is located in the distribution cabinet body (1), the other extrusion plate (5) abuts against the inner wall of the distribution cabinet body (1). An air outlet is opened at one end of the piston cylinder (17) close to the push rod (30), and the diameter ratio of the piston cylinder (17) to the air outlet is 10:

1.

3. A modular power distribution cabinet according to claim 2, characterized in that: An air outlet pipe (27) is fixedly installed in the air outlet hole, an adjustment block (25) for controlling the air outlet speed is installed on the air outlet pipe (27), a baffle (34) for controlling the air outlet area of ​​the air outlet pipe (27) is slidably connected in the adjustment block (25), a threaded hole is opened in the adjustment block (25), and a threaded knob (26) rotatably connected to the baffle (34) is threadedly connected in the threaded hole.

4. A modular power distribution cabinet according to claim 2, characterized in that: The stable reset assembly comprises a fixing frame (22) fixedly mounted on the outside of the installation box (2), the cylindrical contact (20) is slidably connected to the fixing frame (22), an insulating ring is fixedly mounted on the cylindrical contact (20), a second compression spring (21) sleeved on the cylindrical contact (20) is abutted between the fixing frame (22) and the insulating ring, the connecting frame (6) comprises two separately arranged heat conducting plates, the two heat conducting plates are respectively fixedly mounted on the push rod (30) and the insulating ring, a limiting prism (29) penetrating one of the heat conducting plates is fixedly mounted on the outside of the installation box (2), a fuse is installed between the two heat conducting plates, when the circuit load is too large and the heat on the cylindrical contact (20) and the sleeve contact (16) reaches a set value, the fuse disconnects the connection between the two heat conducting plates, so that the second compression spring (21) pushes the cylindrical contact (20) away from the sleeve contact (16).

5. A modular power distribution cabinet according to claim 4, characterized in that: The fuse comprises two separating rods (35) arranged opposite to each other, wherein the separating rods (35) are respectively fixedly mounted on the heat conducting plates on both sides, one of the separating rods (35) is provided with a groove, and the other separating rod (35) is provided with a protrusion matched with the groove, and the groove and the protrusion are both provided with a circular hole, and a hot melt plug (36) is provided in the circular hole.

6. A modular power distribution cabinet according to claim 4, characterized in that: A sliding plate (23) slidably connected to the fixing frame (22) is fixedly mounted on the sleeve contact (16); the fixing frame (22) comprises a fixing plate and two ceramic columns supporting the fixing plate; the ceramic columns are fixed to the mounting box (2) by bolt connection; and the sliding plate (23) slides on the two ceramic columns.

7. A modular power distribution cabinet according to claim 1, characterized in that: The locking assembly comprises a threaded rod (12) rotatably connected to the inner wall of the installation box (2); a first gear (8) is fixedly mounted on a rotating shaft on one side of the threaded rod (12); a gear ring (7) meshing with the first gear (8) is fixedly mounted on the rotation separation mechanism; a through slide groove is provided on the installation box (2); a push column (14) abutting against the connecting frame (6) is slidably connected in the through slide groove; and a push plate (13) fixedly mounted on the push column (14) is threadedly connected to the threaded rod (12).

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