A low-voltage complete set of power distribution equipment

Abstract

This invention relates to the field of low-voltage switchgear technology, specifically a low-voltage complete power distribution device, including a power distribution cabinet, a drawer unit slidably disposed within the power distribution cabinet, a power distribution busbar installed within the power distribution cabinet, and a conductive clamp plate installed on the rear side of the drawer unit for contacting and conducting electricity with the power distribution busbar. A fixed support and a fixed support plate are fixedly disposed on the drawer unit. An elastic component is connected between the conductive clamp plate and the fixed support plate to elastically press the conductive clamp plate against the power distribution busbar to provide initial clamping force. Through the cooperation of the elastic component and the drive component, during normal operation, a push spring applies an initial clamping force to the conductive clamp plate via a sliding guide rod to ensure basic contact. When the contact area becomes loose and heats up, the thermally sensitive medium in the sealed cavity expands due to heat, driving the linkage to apply additional clamping force to the conductive clamp plate. This achieves adaptive adjustment of the contact pressure based on the degree of heat generation, effectively suppressing the increase in contact resistance.

Description

Technical Field

[0001] This invention relates to the field of low-voltage switchgear technology, specifically to a low-voltage complete power distribution device. Background Technology

[0002] Drawer-type low-voltage switchgear is widely used in industrial enterprises, substations, and other applications due to its compact structure, flexible circuit configuration, and convenient maintenance. However, because the drawer unit uses a plug-in electrical connection, poor contact can easily occur between the rear conductive clamp and the distribution busbar due to installation misalignment, contact wear, surface oxidation, loose connections, or thermal expansion and contraction. This leads to increased contact resistance and abnormal heating, which can burn the insulation or even cause phase-to-phase short circuits in severe cases, threatening equipment safety and power supply continuity.

[0003] Regarding the issue of overheating contacts in drawer-type switchgear, existing patent CN103779842B discloses a low-voltage switchgear drawer unit contact temperature monitoring device. This device monitors contact temperature in real time using a temperature sensor and triggers a molded case circuit breaker to cut off the circuit current when the temperature is abnormal, preventing the fault from escalating. While this solution can prevent fault escalation through passive monitoring and power outage protection, its protection action directly leads to power interruption. In applications with stringent continuous power supply requirements, a sudden power outage can cause production stoppage or data loss, resulting in significant economic losses. Therefore, it is difficult to meet the application requirements for high power supply reliability. Summary of the Invention

[0004] The purpose of this invention is to provide a low-voltage complete power distribution device that provides initial contact pressure by setting an elastic component and uses a fixed support plate to transfer the heat from the contact area to the sealed cavity in the drive component. The thermal expansion of the thermosensitive medium drives the linkage to actively apply additional clamping force to the conductive clamp, while the locking component maintains the compensation state. Thus, the device adaptively suppresses contact heating without interrupting the power supply, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a low-voltage complete set of power distribution equipment, including a power distribution cabinet, a drawer unit slidably disposed in the power distribution cabinet, a power distribution bus installed in the power distribution cabinet, and a conductive clamp plate installed on the rear side of the drawer unit for contacting and conducting electricity with the power distribution bus. A fixed support is fixed on the drawer unit, and a plurality of fixed support plates are fixed on the fixed support. An elastic component is connected between the conductive clamp plate and the fixed support plate for elastically pressing the conductive clamp plate against the power distribution bus to provide an initial clamping force.

[0006] The fixed support plate is also provided with a drive assembly and a locking assembly. The drive assembly includes a sealed cavity filled with a thermosensitive medium. The medium in the sealed cavity expands when heated to drive the linkage to apply additional clamping force to the conductive clamp.

[0007] The locking component is used to unidirectionally lock the position of the linkage after the additional clamping action occurs.

[0008] Preferably, the elastic component includes a sliding guide rod and a push spring. The sliding guide rod slides through the fixed support plate and one end of it is fixedly connected to the conductive clamping plate. The push spring is sleeved on the sliding guide rod and its two ends abut against the fixed support plate and the conductive clamping plate, respectively.

[0009] Preferably, the sealed cavity is opened inside the fixed support plate and is connected to a piston cylinder through a U-shaped connecting support pipe. A piston disc is slidably fitted inside the piston cylinder. The piston disc is fixedly connected to a moving connecting rod. A fixed connecting plate is fixed to the end of the moving connecting rod. The fixed connecting plate is connected to the linkage component.

[0010] Preferably, the linkage includes a movable toothed plate, which is slidably disposed in the fixed connecting plate, and a fixed baffle is fixed on the movable toothed plate; when the fixed connecting plate moves toward the conductive clamping plate, it contacts and cooperates with the fixed baffle to push the movable toothed plate to move synchronously.

[0011] Preferably, a movable wedge is fixed on the movable toothed plate, a fixed support plate is fixed on the conductive clamp, a rotating long column is rotatably connected to the fixed support plate, and an inclined surface is provided on the movable wedge to cooperate with the rotating long column, so that when the movable toothed plate moves, the conductive clamp is driven to move closer to the power distribution busbar by the contact pressure between the inclined surface and the rotating long column.

[0012] Preferably, the locking assembly includes a fixed frame plate fixed on the fixed support plate, a fixed connecting block fixed on the fixed frame plate, and a sliding insert. The fixed connecting block has a sliding cavity, and the sliding insert is slidably installed in the sliding cavity. One end of the sliding insert can extend into the tooth groove of the moving tooth plate.

[0013] Preferably, a connecting spring is provided between the groove wall of the sliding cavity and the sliding insert, and the connecting spring applies an elastic force to the sliding insert in the direction of extending into the tooth groove.

[0014] Preferably, a fixed iron block is fixed on the sliding insert, and an electromagnet is fixed on the groove wall of the sliding cavity at a position corresponding to the fixed iron block; when the electromagnet is energized, it attracts the fixed iron block to drive the sliding insert to retract into the sliding cavity against the elastic force of the connecting spring.

[0015] Preferably, the fixed support plate is made of a thermally conductive material to transfer the heat generated at the contact point between the conductive clamp and the power distribution busbar to the heat-sensitive medium inside the sealed cavity.

[0016] Preferably, a sealing ring is fitted on the circumferential outer wall of the piston disc, and the sealing ring slides and seals with the inner wall of the piston cylinder.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting up the cooperation between the elastic component and the drive component, the push spring applies an initial clamping force to the conductive clamp plate through the sliding guide rod to ensure basic contact during normal operation. When the contact part heats up due to loosening, the thermally sensitive medium in the sealed cavity expands due to heat, driving the linkage to apply additional clamping force to the conductive clamp plate. This realizes the adaptive adjustment of contact pressure to actively compensate for the degree of heat generation, effectively suppressing the increase of contact resistance. It can curb the deterioration of heat generation without cutting off the circuit, thus ensuring the continuity of power supply.

[0018] 2. By setting a locking component, after the additional clamping action occurs, the sliding block is engaged in the tooth groove of the moving toothed plate under the action of the connecting spring, forming a one-way anti-reverse fit. This ensures that the conductive clamping plate remains in an increased clamping state before the temperature drops, avoiding the problem of loss of compensating clamping force due to thermal expansion and contraction in the existing solution. This improves contact reliability and effectively avoids the phenomenon of poor contact due to the decay of clamping force. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a schematic diagram showing the connection state between the power distribution bus and the conductive clamp of the present invention.

[0021] Figure 3 This is a schematic diagram of the fixed support structure of the present invention.

[0022] Figure 4 This is a schematic diagram of the elastic component structure of the present invention.

[0023] Figure 5 This is a top view of the fixed support structure of the present invention.

[0024] Figure 6 This is a schematic diagram of the fixed support plate structure of the present invention.

[0025] Figure 7 This is a schematic diagram of the sealed cavity structure of the present invention.

[0026] Figure 8 This is a schematic diagram of the internal structure of the piston cylinder of the present invention.

[0027] Figure 9 This is a top view of the movable wedge structure of the present invention.

[0028] Figure 10 This is a schematic diagram of the fixed frame structure of the present invention.

[0029] Figure 11 This is a schematic diagram of the rotating long column structure of the present invention.

[0030] Figure 12 This is a schematic diagram of the internal structure of the fixed connecting block of the present invention.

[0031] In the diagram: 1. Distribution cabinet; 2. Drawer unit; 3. Distribution busbar; 4. Conductive clamp; 5. Fixed support; 6. Elastic component; 7. Fixed support plate; 9. Drive component; 10. Locking component; 61. Sliding guide rod; 62. Push spring; 90. Fixed baffle; 91. Sealed cavity; 92. Connecting support pipe; 93. Piston cylinder; 94. Piston disc; 95. Moving connecting rod; 96. Fixed connecting plate; 97. Support ring; 98. Fixed support plate; 99. Rotating column; 910. Moving wedge; 101. Moving toothed plate; 102. Fixed frame plate; 103. Fixed connecting block; 104. Sliding insert; 105. Sliding cavity; 106. Connecting spring; 107. Fixed iron block; 108. Electromagnet. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] Please see Figures 1 to 12This invention provides a technical solution: a low-voltage complete set of power distribution equipment, including a power distribution cabinet 1, a drawer unit 2 slidably disposed in the power distribution cabinet 1, a power distribution busbar 3 installed in the power distribution cabinet 1, and a conductive clamp 4 installed on the rear side of the drawer unit 2 for contacting and conducting electricity with the power distribution busbar 3. The power distribution cabinet 1 adopts a standard low-voltage withdrawable switch cabinet structure, and its interior is divided into multiple independent drawer compartments by vertical partitions. Each drawer compartment has an opening on the front side for the drawer unit 2 to be pushed in or pulled out, and a vertical busbar system for connecting the main circuit is fixedly installed on the rear side. The frame of the power distribution cabinet 1 is made of aluminum-zinc coated steel plate, which is bent and then connected by riveting or bolting, and has sufficient mechanical strength and good grounding continuity.

[0035] Drawer unit 2 is a modular pull-out structure, including a drawer body, an operating mechanism, indicating instruments, and secondary connectors mounted on the front of the drawer body, and a conductive clamp 4 mounted on the rear of the drawer body. Guide rollers are provided on both sides of drawer unit 2, which slide in conjunction with guide rails in the drawer compartment of the distribution cabinet 1, enabling smooth movement of drawer unit 2 between the test position and the working position. The pushing mechanism of drawer unit 2 uses a lead screw or screw-type operating handle to provide mechanical assistance and position locking functions, ensuring reliable contact between drawer unit 2 and the distribution bus 3 when in the working position. A conductive clamp 4, made of highly conductive copper, is fixedly installed on the rear panel of each drawer unit 2 for plugging into and conducting electricity with the corresponding distribution bus 3.

[0036] The distribution busbar 3 is a copper or aluminum busbar vertically installed at the rear of the distribution cabinet 1. Its surface can be silver-plated or tin-plated as needed to reduce contact resistance. Each phase distribution busbar 3 is fixed to the rear wall of the distribution cabinet 1 by insulating supports and is electrically connected to the horizontal main busbar. The cross-sectional area and spacing of the distribution busbar 3 are designed according to the requirements of rated current and short-time withstand current, and the part that contacts the conductive clamp 4 is kept smooth and flat to allow the conductive clamp 4 to stably hold and form reliable electrical contact when the drawer unit 2 is pushed in. The aforementioned distribution cabinet 1, drawer unit 2 and its push-in guide structure, distribution busbar 3 and its insulating support structure are all existing mature technologies widely used in low-voltage switchgear and control equipment in this field. Their specific structural forms, material selections and dimensional parameters can be conventionally selected and configured according to the design requirements of the actual product's rated voltage, rated current and protection level, etc., and will not be elaborated here.

[0037] like Figure 2As shown, the back panel of drawer unit 2 is fixed with a fixed support 5 by bolts. The fixed support 5 has a horizontal plate structure. The upper surface of the fixed support 5 is fixed with multiple sets of opposing fixed support plates 7 by welding or screws. Every two fixed support plates 7 are arranged at intervals in the left-right direction. Two conductive clamping plates 4 are sandwiched between every two fixed support plates 7. The two conductive clamping plates 4 are arranged opposite each other and together form a contact group for clamping the same phase distribution bus 3. The fixed support plates 7 are made of aluminum alloy material with good thermal conductivity, such as 6061 aluminum alloy, which can quickly transfer the heat generated by the conductive clamping plates 4 to the subsequent drive assembly 9.

[0038] like Figure 3 as well as Figure 4 As shown, between each conductive clamp 4 and its corresponding fixed support plate 7, there is an elastic component 6 for providing initial clamping force by elastically pressing the conductive clamp 4 against the power distribution bus 3. A horizontally penetrating sliding hole is provided on the fixed support plate 7. One end of the sliding guide rod 61 slides through the sliding hole and is fixedly connected to the outer side of the conductive clamp 4. The fixing method can be threaded connection or welding. The other end of the sliding guide rod 61 extends out of the outer side of the fixed support plate 7 and is provided with a limiting boss to prevent it from falling out. A push spring 62 is sleeved on the sliding guide rod 61. The push spring 62 is a cylindrical helical compression spring in the prior art. Its material is 60Si2MnA spring steel, which has a high elastic limit and fatigue strength. One end of the push spring 62 abuts against the inner side of the fixed support plate 7, and the other end abuts against the outer side of the conductive clamp 4. Thus, the conductive clamp 4 is continuously pressed against the power distribution bus 3 by the elastic restoring force, ensuring that there is an initial contact pressure that meets the standard between the conductive clamp 4 and the power distribution bus 3 after the drawer unit 2 is pushed in.

[0039] The core improvement of this embodiment lies in the integration of a drive assembly 9 and a locking assembly 10 on the fixed support plate 7. Through the cooperation of the elastic assembly 6 and the drive assembly 9, during normal operation, the push spring 62 applies an initial clamping force to the conductive clamping plate 4 via the sliding guide rod 61 to ensure basic contact. When the contact area becomes loose and heats up, the thermally sensitive medium inside the sealed cavity 91 expands due to heat, driving the linkage to apply additional clamping force to the conductive clamping plate 4. This achieves adaptive adjustment of the contact pressure based on the degree of heating, effectively suppressing the increase in contact resistance and preventing heat deterioration without cutting off the circuit, thus ensuring continuous power supply. By setting the locking assembly 10, after the additional clamping action occurs, the sliding insert 104, under the action of the connecting spring 106, engages in the groove of the moving toothed plate 101, forming a one-way anti-reverse fit. This ensures that the conductive clamping plate 4 remains in an increased clamping state before the temperature drops, avoiding the problem of loss of compensating clamping force due to thermal expansion and contraction in existing solutions, and improving contact reliability.

[0040] like Figure 7 as well as Figure 8 As shown, in the drive assembly 9, a sealed cavity 91 is provided inside the fixed support plate 7. The sealed cavity 91 is a rectangular cavity and is filled with a thermosensitive medium, specifically nitrogen gas. Since the fixed support plate 7 is made of thermally conductive aluminum alloy, the sealed cavity 91 forms a thermal coupling relationship with the conductive clamp 4 through the fixed support plate 7. That is, the heat on the conductive clamp 4 can be conducted through the fixed support plate 7 to directly heat the gas in the sealed cavity 91. The sealed cavity 91 is also connected to an air inlet with a sealing valve for replenishing the heat-sensitive medium during assembly or maintenance. The sealed cavity 91 is connected to a piston cylinder 93 through a U-shaped connecting support pipe 92. The piston cylinder 93 is also fixed on the fixed support plate 7, and a piston disc 94 is slidably fitted inside it. An annular sealing groove is opened on the circumferential outer wall of the piston disc 94, and a sealing ring made of fluororubber is fitted inside the groove. The sealing ring forms a sliding seal with the inner wall of the piston cylinder 93, which not only ensures that the gas pressure does not leak, but also provides appropriate frictional damping to prevent the piston disc 94 from moving arbitrarily in the non-heated state. The material of the sealing ring can be nitrile rubber, fluororubber, or silicone rubber, etc., and the cross-sectional shape of the sealing ring can be O-shaped, Y-shaped, or V-shaped. This sealing structure has been widely used in pneumatic and hydraulic components and is a mature sealing technology. Any existing sealing form that can achieve gas sealing between the piston disc 94 and the piston cylinder 93 can be used as a substitute.

[0041] like Figure 7 as well as Figure 8 As shown, the volume of the sealed cavity 91 is set to be relatively large to accommodate a sufficient amount of thermosensitive medium, while the inner diameter of the piston cylinder 93 is set to be relatively small to reduce the force-bearing area of ​​the piston disc 94. In the prior art, based on the ideal gas law and the principle of volume displacement, when the thermosensitive medium in the sealed cavity 91 generates a certain volume expansion due to contact heating, this expansion will all act on the piston disc 94 in the piston cylinder 93. Since the area of ​​the piston disc 94 is small, the linear displacement it generates is equal to the volume expansion divided by the piston area, that is, the displacement is inversely proportional to the piston area. Therefore, by using a combination of a large-volume sealed cavity 91 and a small-diameter piston cylinder 93, the small temperature rise at the contact point of the conductive clamp 4 can be converted into a larger stroke of the moving toothed plate 101, thereby significantly improving the response sensitivity of the drive assembly 9 to heating and ensuring that an effective additional clamping action can be triggered in the early stage of heating.

[0042] Meanwhile, the relatively large volume of the sealed cavity 91 increases the total heat capacity of the thermosensitive medium, enabling it to absorb more heat while maintaining a relatively gentle temperature change. This avoids sudden pressure changes in the thermosensitive medium caused by localized instantaneous high temperatures, resulting in a more stable and continuous additional clamping force output by the drive assembly 9. The smaller inner diameter of the piston cylinder 93 helps to reduce the overall space occupied by the drive assembly 9, facilitating a compact layout on the fixed support plate 7. Furthermore, the smaller diameter of the piston disc 94 reduces the sliding friction resistance between the sealing ring and the inner wall of the piston cylinder 93, which helps to extend the service life of the piston disc 94 and the sealing ring, ensuring the long-term reliability of the device. The ratio between the volume and the inner diameter can be determined through conventional thermodynamic calculations, which are mature existing technologies and will not be elaborated upon here.

[0043] like Figure 8 As shown, a movable connecting rod 95 is threadedly fixed to the end face of the piston disc 94 away from the connecting support tube 92. The movable connecting rod 95 extends horizontally, and its end extends out of the piston cylinder 93 and is fixedly connected to a fixed connecting plate 96. The fixed connecting plate 96 is an L-shaped bent plate used to connect the drive assembly 9 and the linkage component. A support ring 97 is sleeved and fixed on the outer periphery of the piston cylinder 93. The support ring 97 is fixed to the fixed support plate 7 by screws or welding to provide stable support for the piston cylinder 93.

[0044] like Figure 8 as well as Figure 9 As shown, the linkage includes a movable toothed plate 101, which slides through a through hole in the fixed connecting plate 96. A fixed baffle 90 is fixedly installed on the side of the movable toothed plate 101 adjacent to the movable wedge 910. When poor contact causes heat to build up and the gas in the sealed cavity 91 expands, the expanding gas pushes the piston disc 94, the movable connecting rod 95, and the fixed connecting plate 96 to move towards the conductive clamping plate 4. During this movement, the fixed connecting plate 96 first slides on the movable toothed plate 101 until it contacts and pushes the fixed baffle 90, thereby driving the movable toothed plate 101 and the movable wedge 910 to move forward synchronously, forcing the rotating column 99 to drive the fixed support plate 98 and the conductive clamping plate 4 to press further against the power distribution busbar 3.

[0045] When poor contact causes heat generation, leading to gas expansion within the sealed cavity 91, the expanding gas pushes the piston disc 94, the moving connecting rod 95, and the fixed connecting plate 96 towards the conductive clamping plate 4. After sliding a certain distance on the moving toothed plate 101, the fixed connecting plate 96 contacts the fixed baffle 90, thereby pushing the fixed baffle 90, along with the moving toothed plate 101 and the moving wedge 910, to move forward synchronously. At this time, the inclined surface of the moving wedge 910 contacts the rotating column 99 and generates relative sliding, forcing the rotating column 99 to drive the fixed support plate 98 and the conductive clamping plate 4 to press further against the power distribution busbar 3. This applies an additional compensating compensating force on top of the initial compensating force provided by the pushing spring 62. The magnitude of this compensating compensating force is positively correlated with the degree of heat generation, achieving adaptive thermal compensation adjustment.

[0046] When the temperature drops and the gas pressure decreases, the fixed connecting plate 96 returns to its original position along with the piston disc 94 and disengages from the fixed baffle 90. Meanwhile, the moving toothed plate 101 and the conductive clamping plate 4 remain in the increased pressing position under the one-way anti-reverse action of the locking assembly 10, ensuring reliable contact. The above principle of using thermal expansion to drive the generation of compensating pressing force is a known thermodynamic actuation method in the prior art and will not be elaborated here.

[0047] In practical applications, the fixed support plate 7 can also be made of other metal materials with good thermal conductivity, such as copper alloys, as long as the heat generated at the contact point between the conductive clamp 4 and the distribution bus 3 can be effectively transferred to the sealed cavity 91. In addition to nitrogen, the heat-sensitive medium filled in the sealed cavity 91 can also be other gases or gas-liquid mixtures with thermal expansion characteristics, as long as its volume expansion coefficient is sufficient to drive the piston disc 94 to produce the corresponding displacement. The elastic coefficient and specifications of the push spring 62 and the connecting spring 106 can also be adaptively adjusted according to the voltage level, rated current and installation space of different models of power distribution devices. Such adjustment is a conventional design method for those skilled in the art after knowing the concept of the present invention.

[0048] like Figures 9 to 12 As shown, the locking assembly 10 includes a fixing frame plate 102 fixed to the outer side of the fixing support plate 7 by screws. A fixing connecting block 103 is welded or integrally formed on the fixing frame plate 102. A sliding cavity 105 is formed inside the fixing connecting block 103. A sliding insert 104 is slidably installed in the sliding cavity 105. The lower end of the sliding insert 104 is machined with a wedge-shaped head that is complementary to the shape of the tooth groove of the moving tooth plate 101. The wedge-shaped head can extend into the tooth groove of the moving tooth plate 101. A connecting spring 106 is fixedly connected between the top wall of the sliding cavity 105 and the upper end face of the sliding insert 104. The connecting spring 106 is a cylindrical helical compression spring made of stainless steel wire. It mainly serves to reset and pre-tighten. The connecting spring 106 always applies a thrust to the sliding insert 104 in the direction of the tooth groove.

[0049] When the moving toothed plate 101 moves towards the conductive clamping plate 4 under the drive of heat, the lower inclined surface of the sliding insert 104 will contact the tooth tip inclined surface of the moving toothed plate 101, thereby being pushed upward, compressing the connecting spring 106 and temporarily retracting into the sliding cavity 105. After the moving toothed plate 101 moves one tooth pitch, the sliding insert 104 is re-engaged into the next tooth groove under the restoring force of the connecting spring 106, thus forming a ratchet-type one-way anti-reverse engagement to prevent the moving toothed plate 101 from retracting when the temperature drops and the gas pressure decreases.

[0050] like Figure 12 As shown, to unlock the drawer unit 2 when it is normally pulled out, an electromagnet 108 is fixedly installed on the top wall of the sliding cavity 105. The coil of the electromagnet 108 is connected to the control button on the panel of the drawer unit 2 or an external control circuit through a lead wire. A fixed iron block 107 is fixed on the top surface of the sliding block 104, and the fixed iron block 107 corresponds to the position of the iron core of the electromagnet 108. When the electromagnet 108 is energized, the generated electromagnetic attraction overcomes the elastic force of the connecting spring 106, and pulls the sliding block 104 together with the fixed iron block 107 upward, so that the lower end of the sliding block 104 completely exits the tooth groove of the moving tooth plate 101, thereby releasing the one-way lock on the moving tooth plate 101.

[0051] In actual use, when the drawer unit 2 is pushed into the power distribution cabinet 1, the push spring 62 between the fixed support plates 7 on the fixed support 5 will press the conductive clamp 4 against the power distribution bus 3 through the sliding guide rod 61, so that the two maintain normal electrical contact.

[0052] If the contact between the conductive clamp 4 on the rear side of the drawer unit 2 and the power distribution bus 3 is loose and causes poor contact and heat generation, the heat will be transferred from the fixed support plate 7 to the sealed cavity 91 inside it. The heat-sensitive gas filled in the cavity expands when heated. The expanded gas enters the piston cylinder 93 through the connecting support pipe 92 and pushes the piston disc 94 to move. The piston disc 94 drives the fixed connecting plate 96 to move towards the conductive clamp 4 through the moving connecting rod 95.

[0053] After the fixed connecting plate 96 slides a certain distance on the moving toothed plate 101, it comes into contact with the fixed baffle 90, which in turn pushes the fixed baffle 90 and the moving toothed plate 101 to slide forward in the fixed frame plate 102. At this time, the moving wedge 910 on the moving toothed plate 101 applies force by contacting the rotating column 99 with its inclined surface, so that the fixed support plate 98 and the conductive clamp 4 are further pressed and adhered to the power distribution busbar 3, thereby rapidly reducing the contact resistance and suppressing the aggravation of heat generation.

[0054] At the same time, the sliding insert 104 inside the fixed connecting block 103 is pushed and compressed by the tooth groove during the forward movement of the moving tooth plate 101 and retracts into the sliding cavity 105. After the tooth groove is in place, the sliding insert 104 is again locked into the corresponding tooth groove under the action of the connecting spring 106, forming a one-way lock to prevent natural retraction after the temperature drops.

[0055] When the drawer unit 2 needs to be pulled out for maintenance or disconnection, the electromagnet 108 is energized to generate magnetic force to attract and fix the iron block 107, causing the sliding insert 104 to retract against the connecting spring 106 and disengage from the tooth groove of the moving tooth plate 101, thus releasing the limitation on the moving tooth plate 101. The conductive clamp 4 then returns to its initial pressing state, which is only acted upon by the pushing spring 62, and the drawer unit 2 can be pulled out smoothly.

[0056] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0057] It should be noted that all electrical components mentioned in this article are electrically connected to the controller and power supply. The control method of this invention is controlled by the controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming. The power supply is also common knowledge in the art. Furthermore, this invention is mainly used to protect mechanical devices, so the control method and circuit connection will not be explained in detail.

[0058] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can 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 low-voltage complete set of power distribution equipment, comprising a power distribution cabinet (1), a drawer unit (2) slidably disposed within the power distribution cabinet (1), a power distribution busbar (3) installed within the power distribution cabinet (1), and a conductive clamp (4) installed on the rear side of the drawer unit (2) for contacting and conducting electricity with the power distribution busbar (3), characterized in that: A fixed support (5) is fixed on the drawer unit (2), and a plurality of fixed support plates (7) are fixed on the fixed support (5). An elastic component (6) is connected between the conductive clamp (4) and the fixed support plate (7) to elastically press the conductive clamp (4) against the power distribution bus (3) to provide an initial clamping force. The fixed support plate (7) is also provided with a drive assembly (9) and a locking assembly (10). The drive assembly (9) includes a sealed cavity (91) filled with a thermosensitive medium. The medium in the sealed cavity (91) expands when heated to drive the linkage to apply additional clamping force to the conductive clamp (4). The locking component (10) is used to lock the position of the linkage in one direction after the additional clamping action occurs.

2. A low-voltage complete power distribution unit according to claim 1, characterized in that: The elastic component (6) includes a sliding guide rod (61) and a push spring (62). The sliding guide rod (61) slides through the fixed support plate (7) and one end of it is fixedly connected to the conductive clamp (4). The push spring (62) is sleeved on the sliding guide rod (61) and its two ends abut against the fixed support plate (7) and the conductive clamp (4) respectively.

3. A low-voltage complete set of power distribution equipment according to claim 1, characterized in that: The sealed cavity (91) is opened inside the fixed support plate (7) and is connected to the piston cylinder (93) through the U-shaped connecting support pipe (92). The piston cylinder (93) is slidably fitted with a piston disc (94). The piston disc (94) is fixedly connected to a moving connecting rod (95). The end of the moving connecting rod (95) is fixedly connected to a fixed connecting plate (96). The fixed connecting plate (96) is connected to the linkage component.

4. A low-voltage complete set of power distribution equipment according to claim 3, characterized in that: The linkage component includes a movable toothed plate (101), which is slidably disposed in the fixed connecting plate (96), and a fixed baffle (90) is fixed on the movable toothed plate (101). When the fixed connecting plate (96) moves toward the conductive clamp (4), it contacts and engages with the fixed baffle (90) to push the moving toothed plate (101) to move synchronously.

5. A low-voltage complete set of power distribution equipment according to claim 4, characterized in that: A movable wedge (910) is also fixed on the movable toothed plate (101), a fixed support plate (98) is fixed on the conductive clamping plate (4), and a rotating long column (99) is rotatably connected to the fixed support plate (98). The movable wedge (910) has an inclined surface that cooperates with the rotating column (99) so that when the movable toothed plate (101) moves, the conductive clamp (4) is driven to move closer to the power distribution bus (3) by the contact pressure between the inclined surface and the rotating column (99).

6. A low-voltage complete power distribution unit according to claim 4, characterized in that: The locking assembly (10) includes a fixed frame plate (102) fixed on the fixed support plate (7), a fixed connecting block (103) fixed on the fixed frame plate (102), and a sliding insert (104). The fixed connecting block (103) has a sliding cavity (105) inside. The sliding insert (104) is slidably installed in the sliding cavity (105), and one end of the sliding insert (104) can extend into the tooth groove of the moving tooth plate (101).

7. A low-voltage complete power distribution unit according to claim 6, characterized in that: A connecting spring (106) is provided between the groove wall of the sliding cavity (105) and the sliding plug (104), and the connecting spring (106) applies an elastic force to the sliding plug (104) in the direction of extending into the groove.

8. A low-voltage complete power distribution unit according to claim 7, characterized in that: A fixed iron block (107) is fixed on the sliding insert (104), and an electromagnet (108) is fixed on the groove wall of the sliding cavity (105) at the position corresponding to the fixed iron block (107). When the electromagnet (108) is energized, it attracts the fixed iron block (107) so that the sliding plug (104) overcomes the elastic force of the connecting spring (106) and retracts into the sliding cavity (105).

9. A low-voltage complete power distribution unit according to claim 1, characterized in that: The fixed support plate (7) is made of thermally conductive material to transfer the heat generated at the contact point between the conductive clamp (4) and the power distribution bus (3) to the heat-sensitive medium inside the sealed cavity (91).

10. A low-voltage complete set of power distribution equipment according to claim 3, characterized in that: A sealing ring is fitted on the circumferential outer wall of the piston disc (94), and the sealing ring slides and seals with the inner wall of the piston cylinder (93).

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