Direct-current power supply distribution unit

Abstract

The utility model discloses a direct-current power supply distribution unit, and belongs to the technical field of direct-current power supplies. According to the scheme, the shell of the DC power supply distribution unit is provided with the electromechanical locking mechanism, and the electromechanical locking mechanism controls the on-off of the DC power supply control unit, and locks the position of the DC power supply distribution unit through the cooperation of the lock hook and the clamping groove in the DC power supply distribution unit installation groove when the DC power supply control unit is switched on. And when the direct-current power supply control unit is disconnected, the locking of the position of the direct-current power supply distribution unit is relieved. When the direct current power supply distribution unit needs to be pulled out, the position of the electromechanical locking mechanism must be manually adjusted to disconnect the direct current power supply control unit, the lock hook is separated from the clamping groove, and then the direct current power supply distribution unit can be smoothly pulled out, thereby ensuring that the direct current power supply distribution unit is pulled out after being powered off, and avoiding the safety problems of arc discharge and the like. The scheme has remarkable advantages in the aspects of improving operation safety, guaranteeing safe operation of electric equipment and improving reliability, continuity and stability of a power supply system.

Description

Technical Field

[0001] This utility model relates to the field of DC power supply technology, and in particular to a DC power distribution unit. Background Technology

[0002] With the continuous development of power systems, high-voltage direct current (HVDC) transmission technology has been widely applied in locations such as AI data centers. Especially in data center environments, HVDC electrical systems provide essential power to server racks, and their safe and stable operation is crucial for ensuring the continuous and efficient operation of the data center. Currently, to improve the flexibility and maintainability of power distribution systems, HVDC power distribution units within server racks typically employ a modular design. This design allows for multiple mounting slots for DC power distribution units within the rack, enabling convenient plug-and-play installation and maintenance. However, directly removing a DC power distribution unit without disconnecting the power can cause arcing and other potential safety issues, such as the risk of electric shock or equipment damage. This not only threatens the safety of operators but may also lead to a power outage for the entire data center, affecting the continuity of data processing and services. Utility Model Content

[0003] To address the aforementioned problems in the prior art, this utility model proposes a DC power distribution unit that ensures power is cut off before disconnection via an electromechanical interlock mechanism.

[0004] The technical solution of this utility model is as follows: a DC power distribution unit is provided, wherein the DC power distribution unit is installed in a DC power distribution unit mounting slot, an electromechanical locking mechanism is provided on the housing of the DC power distribution unit, a DC power distribution unit circuit is provided inside the housing of the DC power distribution unit, and a DC power control unit is connected in series in the DC power distribution unit circuit, and the electromechanical locking mechanism is used to control the conduction and disconnection of the DC power control unit.

[0005] The electromechanical locking mechanism is provided with a locking hook, and the DC power distribution unit mounting slot is provided with a slot; when the position of the electromechanical locking mechanism is adjusted to make the DC power control unit in the conducting state, the locking hook is limited by the slot; when the position of the electromechanical locking mechanism is adjusted to make the DC power control unit in the disconnected state, the locking hook disengages from the slot.

[0006] In this embodiment, the electromechanical locking mechanism, besides controlling the on / off state of the DC power control unit, also locks the position of the DC power distribution unit when the DC power control unit is on, through the engagement of the locking hook and the slot on the DC power distribution unit mounting slot. When the DC power control unit is off, the locking of the DC power distribution unit's position is released. When it is necessary to remove the DC power distribution unit, the position of the electromechanical locking mechanism must be manually adjusted to disconnect the DC power control unit and disengage the locking hook from the slot before the DC power distribution unit can be smoothly removed. This ensures that power is disconnected before removal, avoiding safety issues such as arcing. This solution demonstrates significant advantages in improving operational safety, ensuring the safe operation of electrical equipment, and enhancing the reliability, continuity, and stability of the power supply system.

[0007] In this embodiment of the DC power distribution unit, the housing of the DC power distribution unit is a cuboid structure with openings on both sides, including a top plate of the DC power distribution unit housing, a bottom plate of the DC power distribution unit housing, a front panel of the DC power distribution unit housing, and a rear panel of the DC power distribution unit housing.

[0008] After the DC power distribution unit is inserted into the DC power distribution unit mounting slot, the rear panel of the DC power distribution unit housing faces the inside of the cabinet, and the front panel of the DC power distribution unit housing faces the cabinet door. The outer side of the rear panel of the DC power distribution unit housing is provided with DC power input terminals and DC power output terminals, and the outer side of the front panel of the DC power distribution unit housing is provided with a handle and an electromechanical locking mechanism.

[0009] The wiring terminals face inwards to facilitate wiring, while the handles and electromechanical locking mechanisms face the cabinet door for easy installation and disassembly.

[0010] In the DC power distribution unit of this embodiment, the edge of the slot is provided with an inclined surface that slopes inward toward the slot.

[0011] The edge of the slot is designed with an inward-sloping bevel to facilitate the insertion and removal of the locking hook.

[0012] In the DC power distribution unit of this embodiment, the locking hook is strip-shaped or cylindrical.

[0013] Setting the locking hook to be strip-shaped or column-shaped helps to improve its bending resistance and makes the overall structure of the electromechanical locking mechanism more compact.

[0014] In the DC power distribution unit of this embodiment, the electromechanical locking mechanism is disposed at the lower part of the front panel of the DC power distribution unit housing, and the slot is disposed on the bottom plate of the DC power distribution unit mounting slot.

[0015] The electromechanical locking mechanism is located at the lower part of the front panel of the DC power distribution unit housing. The locking hook is inserted downward into the slot, which is convenient for users to operate manually and makes the position locking more secure.

[0016] In the DC power distribution unit of this embodiment, the electromechanical locking mechanism is a rotary switch with two positions. The rotary switch can switch between two states: open and closed. The rotary switch includes a rotatable first operating knob. The first operating knob is connected to an internal switching mechanism through a first rotating shaft. The locking hook is set on the first rotating shaft and rotates together with the first operating knob.

[0017] The first operating knob is located outside the housing of the DC power distribution unit, and the locking hook is located inside the housing of the DC power distribution unit; the output terminal of the knob switch is connected to the control circuit of the DC power control unit; when the knob switch is in the open state, the DC power control unit is turned on, and the locking hook is limited by the slot; when the knob switch is in the closed state, the DC power control unit is disconnected from the DC power distribution unit circuit, and the locking hook disengages from the slot.

[0018] A locking hook is installed on the shaft of the dual-position rotary switch. By reasonably setting the position of the locking hook, the locking hook is limited by the slot when the rotary switch is in the open state, and the locking hook disengages from the slot when the rotary switch is in the closed state. This cleverly realizes the electromechanical linkage problem, making it impossible to remove the DC power distribution unit from the cabinet when the power is not disconnected, thus improving the electrical safety.

[0019] In the DC power distribution unit of this embodiment, the rotary switch is a self-locking rotary switch.

[0020] The self-locking rotary switch has a position locking device, which allows the first operating knob to be stably locked in two positions to prevent knob displacement caused by accidental vibration or accidental touch.

[0021] In the DC power distribution unit of this embodiment, the electromechanical locking mechanism includes a mechanical knob and a rocker switch. The mechanical knob includes a rotatable second operating knob that can switch between two positions. The second operating knob is connected to a second rotating shaft, and the locking hook is disposed on the second rotating shaft. The second operating knob is located outside the housing of the DC power distribution unit, and the locking hook is located inside the housing of the DC power distribution unit.

[0022] A cam is also provided on the second rotating shaft. The rocker switch and the cam are located inside the housing of the DC power distribution unit. The output terminal of the rocker switch is connected to the control circuit of the DC power control unit. The cam and the locking hook rotate together with the second operating knob. When the second operating knob is in the first position, the cam moves the rocker operation button of the rocker switch to the on state, and the DC power control unit is turned on. When the second operating knob is in the second position, the cam moves the rocker operation button to the off state, and the DC power control unit is disconnected from the DC power distribution unit circuit.

[0023] Position locking is achieved through a mechanical knob, and the DC power control unit is switched on and off through the cooperation of a cam and a rocker switch, which can also play a role in electromechanical linkage.

[0024] In the DC power distribution unit of this embodiment, the mechanical knob further includes a mechanical locking device, so that the second operating knob can be self-locked in the first position and the second position.

[0025] The mechanical locking device prevents displacement caused by accidental vibration or accidental touch, ensuring that the mechanical knob remains in the intended position. Attached Figure Description

[0026] Figure 1 A front view of a DC power distribution unit provided in an embodiment of this utility model.

[0027] Figure 2 This is a three-dimensional structural diagram of the DC power distribution unit provided in Embodiment 1 after it has been inserted into the cabinet.

[0028] Figure 3 for Figure 2 A partially enlarged schematic diagram of the electromechanical locking mechanism.

[0029] Figure 4 This is a partial schematic diagram of the mounting slot for the DC power distribution unit provided in Embodiment 1.

[0030] Figure 5 This is a bottom view of the mounting slot bottom plate for the electromechanical locking mechanism and DC power distribution unit provided in Embodiment 1.

[0031] Figure 6 The front view of the electromechanical locking mechanism provided in Embodiment 1 in the closed state.

[0032] Figure 7 The front view of the electromechanical locking mechanism provided in Embodiment 1 in the open state.

[0033] Figure 8 The front view of the electromechanical locking mechanism provided in Embodiment 2 in the open state.

[0034] Figure 9 The front view of the electromechanical locking mechanism provided in Embodiment 2 in the closed state.

[0035] Figure 10 A schematic diagram of the equivalent circuit of the DC power distribution unit provided in the embodiment of this utility model.

[0036] In the attached diagram:

[0037] 100. DC power distribution unit; 101. Top plate of DC power distribution unit housing; 102. Bottom plate of DC power distribution unit housing; 103. Front panel of DC power distribution unit housing; 104. Rear panel of DC power distribution unit housing; 105. DC power input terminal; 106. DC power output terminal; 107. Handle; 108. DC power protection unit; 109. DC power control unit; 110. Auxiliary power supply;

[0038] 200. DC power distribution unit mounting slot; 201. DC power distribution unit mounting slot base plate; 202. Slot;

[0039] 300. Electromechanical locking mechanism; 301. First operating knob; 302. Locking hook; 303. Second operating knob; 304. Cam; 305. Rocker switch; 306. Rocker operating button. Detailed Implementation

[0040] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0041] The DC power distribution unit provided by this utility model is equipped with an electromechanical locking mechanism, which can control the conduction and disconnection of the circuit within the DC power distribution unit. When the circuit within the DC power distribution unit is on, the position of the DC power distribution unit is locked, and when the circuit within the DC power distribution unit is off, the position of the DC power distribution unit is unlocked, thereby preventing safety issues caused by unplugging the DC power distribution unit while the power is on.

[0042] This utility model embodiment provides a DC power distribution unit, which is installed in a DC power distribution unit mounting slot. An electromechanical locking mechanism is provided on the housing of the DC power distribution unit, and a DC power distribution unit circuit is provided inside the housing. A DC power control unit is connected in series in the DC power distribution unit circuit. The electromechanical locking mechanism is used to control the on and off states of the DC power control unit. A locking hook is provided on the electromechanical locking mechanism, and a slot is provided in the DC power distribution unit mounting slot. When the position of the electromechanical locking mechanism is adjusted to put the DC power control unit in a conducting state, the locking hook is limited by the slot. When the position of the electromechanical locking mechanism is adjusted to put the DC power control unit in a disengaged state, the locking hook disengages from the slot.

[0043] like Figure 1As shown, the housing of the DC power distribution unit 100 is a cuboid structure with openings on both sides, including a top plate 101, a bottom plate 102, a front panel 103, and a rear panel 104. After the DC power distribution unit 100 is inserted into the mounting slot 200, the rear panel 104 faces the inside of the cabinet, and the front panel 103 faces the cabinet door. A DC power input terminal 105 and a DC power output terminal 106 are provided on the outer side of the rear panel 104. The DC power input terminal 105 is used to connect to a high-voltage DC power supply, and the DC power output terminal 106 is used to output high-voltage DC power. Electrical equipment is connected to the high-voltage DC power supply cabinet through the DC power output terminal 106. A handle 107 and an electromechanical locking mechanism 300 are provided on the outer side of the front panel 103 for easy installation and disassembly. The housing of the DC power distribution unit 100 houses a DC power protection unit 108, a DC power control unit 109, and an auxiliary power supply 110. The DC power protection unit 108 includes, but is not limited to, fuses and circuit breakers, and is used to protect against abnormal conditions such as overcurrent, overload, and short circuits occurring within the DC power distribution unit 100, thus improving system safety. The DC power control unit 109 includes, but is not limited to, contactors and relays. The auxiliary power supply 110 supplies power to the DC power control unit 109. High-voltage DC power is input from the DC power input terminal 105, passes sequentially through the DC power protection unit 108 and the DC power control unit 109, and is output from the DC power output terminal 106. The DC power input terminal 105, DC power protection unit 108, DC power control unit 109, and DC power output terminal 106 constitute the DC power distribution unit circuit, with the DC power control unit 109 connected in series within this circuit. Each DC power distribution unit 100 corresponds to one DC power output. The electromechanical locking mechanism 300 controls the switching on and off of the DC power control unit 109 to achieve the switching on and off of the DC power distribution unit circuit. When the DC power control unit 109 is on, the corresponding DC power distribution unit 100 outputs DC power; when the DC power control unit 109 is off, the corresponding DC power distribution unit 100 stops outputting DC power. Because the DC power distribution unit 100 is pluggably installed in the DC power distribution unit mounting slot 200 in the rack, failure to disconnect the power before unplugging may cause arcing and other potential safety issues, such as the risk of electric shock or equipment damage. This not only threatens the safety of operators but may also lead to a power supply interruption for the entire data center, thereby affecting the continuity of data processing and services.

[0044] Therefore, in this embodiment of the invention, the electromechanical locking mechanism 300, in addition to controlling the on / off state of the DC power control unit 109, also locks the position of the DC power distribution unit 100 when the DC power control unit 109 is on, through the cooperation of the locking hook 302 and the slot 202 on the DC power distribution unit mounting slot 200. When the DC power control unit 109 is off, the locking of the position of the DC power distribution unit 100 is released. When it is necessary to pull out the DC power distribution unit 100, the position of the electromechanical locking mechanism 300 must be manually adjusted to disconnect the DC power control unit 109 and disengage the locking hook 302 from the slot 202 before the DC power distribution unit 100 can be pulled out smoothly. This ensures that the power is disconnected before removal, avoiding safety issues such as arcing.

[0045] Example 1

[0046] like Figures 2-7 As shown, in this embodiment, the electromechanical locking mechanism 300 is a rotary switch with two positions, which can switch between open and closed states. The rotary switch includes a rotatable first operating knob 301, which is connected to an internal switching mechanism via a first rotating shaft. The locking hook 302 is mounted on the first rotating shaft and rotates together with the first operating knob 301. The first operating knob 301 is located outside the housing of the DC power distribution unit 100, and the locking hook 302 is located inside the housing of the DC power distribution unit 100. The output end of the rotary switch is connected to the control circuit of the DC power control unit 109. When the rotary switch is in the open state, the DC power control unit 109 is turned on, and the locking hook 302 is limited by the slot 202. When the rotary switch is in the closed state, the DC power control unit 109 is disconnected from the DC power distribution unit circuit, and the locking hook 302 disengages from the slot 202.

[0047] The electromechanical locking mechanism 300 in this embodiment is essentially a dual-position rotary switch with a locking hook 302 added. By appropriately setting the positions of the locking hook 302 and the slot 202, when the rotary switch is in the open state, the end of the locking hook 302 rotates into the slot 202 and is limited by the slot 202. When the rotary switch is in the closed state, the end of the locking hook 302 disengages from the slot 202. In practical applications, the locking hook 302 is made of a material that is difficult to deform, such as metal or nylon, and its shape is strip-shaped or cylindrical. Setting the locking hook 302 as strip-shaped or cylindrical helps to improve its bending resistance and makes the overall structure of the electromechanical locking mechanism 300 more compact.

[0048] like Figures 1-3 , Figures 6-7As shown, in this embodiment, the electromechanical locking mechanism 300 is disposed at the lower part of the front panel 103 of the DC power distribution unit housing, and the slot 202 is disposed on the bottom plate 201 of the DC power distribution unit mounting slot. The electromechanical locking mechanism 300 is disposed at the lower part of the front panel 103 of the DC power distribution unit housing, and the locking hook 302 is inserted downwards into the slot 202, facilitating manual operation by the user and ensuring a more stable position lock. Figure 7 As shown, when the rotary switch is in the ON state, the arrow on the first operating knob 301 points to the right, and the locking hook 302 falls into the slot 202 and is limited by the slot 202; at this time, rotating the rotary switch counterclockwise causes the locking hook 302 to gradually disengage from the slot 202, as... Figure 6 As shown, when the arrow on the first operating knob 301 points upward, the knob switch is in the off state. To facilitate the insertion and removal of the locking hook 302 from the slot 202, as... Figure 4 , Figure 5 As shown, in this embodiment, the edge of the card slot 202 is provided with an inclined surface that slopes inward into the card slot 202. Figure 5 In the middle, the rotary switch is in the on state, and the end of the locking hook 302 is located in the center of the slot 202. The upper surface of the slot 202 is provided with an inclined plane symmetrical about the central axis of the locking hook 302, forming a pendulum-like swing trajectory surface, which allows the end of the locking hook 302 to easily enter and exit the slot 202. It is understandable that... Figures 2-3 , Figures 6-7 In the diagram, the direction of the arrow is for illustrative purposes only. In actual applications, the rotation angle between the on and off states of the rotary switch is not necessarily 90°.

[0049] In this embodiment, the rotary switch is a self-locking rotary switch. The self-locking rotary switch has a position locking device, which allows the first operating knob 301 to be stably locked in two positions to prevent knob displacement caused by accidental vibration or touch. These two positions correspond to the on and off states of the rotary switch, respectively.

[0050] It is understood that the positions of the electromechanical locking mechanism 300 and the slot 202 are not limited to those of other types of devices. Figures 1-7As shown, as long as the positions of the electromechanical locking mechanism 300 and the slot 202 are relatively fixed, the locking hook 302 is limited by the slot 202 when the knob switch is in the open state, and the locking hook 302 disengages from the slot 202 when the knob switch is in the closed state. For example, the electromechanical locking mechanism 300 can be located on the upper part of the front panel 103 of the DC power distribution unit housing, and the slot 202 can be located on the top plate of the DC power distribution unit mounting slot 200; or the electromechanical locking mechanism 300 can be located near the left edge of the front panel 103 of the DC power distribution unit housing, and the slot 202 can be located on the left side plate of the DC power distribution unit mounting slot 200; or the electromechanical locking mechanism 300 can be located near the right edge of the front panel 103 of the DC power distribution unit housing, and the slot 202 can be located on the right side plate of the DC power distribution unit mounting slot 200.

[0051] like Figure 10 The diagram shown is an equivalent circuit diagram of this embodiment. Contactor KM represents the DC power control unit 109. One end of the normally open contact of the rotary switch SB is connected to one end of the coil of contactor KM. The other end of the coil of contactor KM is connected to the positive terminal of the DC auxiliary power supply DC_AUXPOWER. The other end of the normally open contact of the rotary switch SB is connected to the negative terminal of the DC auxiliary power supply DC_AUXPOWER. The two normally open contacts of contactor KM are connected between the DC power input terminal INPUT and the DC power output terminal OUTPUT. Figure 10 (Other components in the DC power distribution unit are omitted). When the rotary switch SB is in the open position, the normally open contact of the rotary switch is closed, the coil of contactor KM is energized, the two normally open contacts of contactor KM are closed, the DC power distribution unit circuit is turned on, and the DC power distribution unit outputs DC power. When the rotary switch SB is in the closed position, the normally open contact of the rotary switch is open, the coil of contactor KM is de-energized, the two normally open contacts of contactor KM are open, the DC power distribution unit circuit is turned off, and the DC power distribution unit stops outputting DC power.

[0052] Example 2

[0053] like Figures 8-9As shown, in this embodiment, the electromechanical locking mechanism 300 includes a mechanical knob and a rocker switch 305. The mechanical knob includes a rotatable second operating knob 303, which can switch between two positions. The second operating knob 303 is connected to a second rotating shaft, and the locking hook 302 is disposed on the second rotating shaft. The second operating knob 303 is located outside the housing of the DC power distribution unit 100, and the locking hook 302 is located inside the housing of the DC power distribution unit 100. A cam 304 is also disposed on the second rotating shaft, and the rocker switch 305 and the cam 304 are located on the DC power distribution unit 100. Inside the housing of unit 100, the output terminal of the rocker switch 305 is connected to the control circuit of the DC power control unit 109; the cam 304 and the locking hook 302 rotate together with the second operating knob 303. When the second operating knob 303 is in the first position, the cam 304 moves the rocker operation button 306 of the rocker switch 305 to the open state, and the DC power control unit 109 is turned on; when the second operating knob 303 is in the second position, the cam 304 moves the rocker operation button 306 to the closed state, and the DC power control unit 109 is disconnected from the DC power distribution unit circuit.

[0054] The difference between this embodiment and Embodiment 1 is that a combination of a mechanical knob and a rocker switch is used instead of a rotary switch. The difference between the mechanical knob and the rotary switch in this embodiment is that there is only a mechanical rotating part; there is no switching mechanism. The electrical connection with the DC power supply control unit is achieved by a rocker switch. Its equivalent circuit diagram is as follows. Figure 10 As shown. In this embodiment, the locking hook 302 and the slot 202 are used to lock and unlock the DC power distribution unit 100. In order to control the boat-shaped operation button 306, a cam 304 is provided on the rotating shaft of the mechanical knob. Both the cam 304 and the locking hook 302 rotate together with the second operation knob 303.

[0055] The mechanical knob also includes a mechanical locking device, which enables the second operating knob 303 to self-lock between the first and second positions, preventing accidental switching. The mechanical locking device can employ a commonly used slot and protrusion mating structure in the prior art.

[0056] like Figures 7-8As shown, in this embodiment, the mechanical knob is located at the lower part of the front panel 103 of the DC power distribution unit housing, the slot 202 is located on the bottom plate 201 of the DC power distribution unit mounting slot, and the rocker switch 305 is located to the left of the mechanical knob. When the arrow on the second operating knob 303 points to the right, the locking hook 302 falls into the slot 202, and the cam 304 is located above and to the right of the rocker switch 305. Under the action of the cam 304, the rocker switch 305 is in the open state. When the second operating knob 303 is rotated counterclockwise in the open state, the locking hook 302 disengages from the slot 202. When the arrow on the second operating knob 303 points upward, the cam 304 is located below and to the left of the rocker switch 305. Under the action of the cam 304, the rocker switch 305 is in the closed state. It is understood that the positions of the boat-shaped switch 305, the cam 304, the locking hook 302, and the slot 202 can be adjusted as needed, as long as it ensures that the position of the DC power distribution unit 100 is locked when the DC power control unit 109 is turned on, and the position lock of the DC power distribution unit 100 is released when the DC power control unit 109 is turned off. Similar to the embodiment, the electromechanical locking mechanism 300 of this embodiment can also be arranged in the upper, lower, left, and right directions of the front panel 103 of the DC power distribution unit housing.

[0057] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many modifications under the guidance of the present invention without departing from the spirit and scope of the claims. All of these modifications are within the protection scope of the present invention.

Claims

1. A DC power distribution unit, characterized in that, The DC power distribution unit (100) is installed in the DC power distribution unit mounting slot (200). An electromechanical locking mechanism (300) is provided on the housing of the DC power distribution unit (100). A DC power distribution unit circuit is provided inside the housing of the DC power distribution unit (100). A DC power control unit (109) is connected in series in the DC power distribution unit circuit. The electromechanical locking mechanism (300) is used to control the on and off of the DC power control unit (109). The electromechanical locking mechanism (300) is provided with a locking hook (302), and the DC power distribution unit mounting slot (200) is provided with a slot (202); when the position of the electromechanical locking mechanism (300) is adjusted so that the DC power control unit (109) is in the conducting state, the locking hook (302) is limited by the slot (202); when the position of the electromechanical locking mechanism (300) is adjusted so that the DC power control unit (109) is in the disconnected state, the locking hook (302) disengages from the slot (202).

2. The DC power distribution unit according to claim 1, characterized in that, The housing of the DC power distribution unit (100) is a cuboid structure with openings on both sides, including a top plate (101), a bottom plate (102), a front panel (103), and a rear panel (104). After the DC power distribution unit (100) is inserted into the DC power distribution unit mounting slot (200), the rear panel (104) of the DC power distribution unit housing faces the inside of the cabinet, and the front panel (103) of the DC power distribution unit housing faces the cabinet door. The outside of the rear panel (104) of the DC power distribution unit housing is provided with a DC power input terminal (105) and a DC power output terminal (106). The outside of the front panel (103) of the DC power distribution unit housing is provided with a handle (107) and an electromechanical locking mechanism (300).

3. The DC power distribution unit according to claim 1, characterized in that, The edge of the card slot (202) is provided with an inclined surface that slopes inward into the card slot (202).

4. The DC power distribution unit according to claim 1, characterized in that, The locking hook (302) is strip-shaped or cylindrical.

5. The DC power distribution unit according to claim 2, characterized in that, The electromechanical locking mechanism (300) is located at the lower part of the front panel (103) of the DC power distribution unit housing, and the slot (202) is located on the bottom plate (201) of the DC power distribution unit mounting slot.

6. The DC power distribution unit according to claim 2, characterized in that, The electromechanical locking mechanism (300) is a rotary switch with two positions. The rotary switch can switch between open and closed states. The rotary switch includes a rotatable first operating knob (301). The first operating knob (301) is connected to the internal switching mechanism through a first rotating shaft. The locking hook (302) is set on the first rotating shaft and rotates together with the first operating knob (301). The first operating knob (301) is located outside the housing of the DC power distribution unit (100), and the locking hook (302) is located inside the housing of the DC power distribution unit (100). The output end of the knob switch is connected to the control circuit of the DC power control unit (109). When the knob switch is in the open state, the DC power control unit (109) is turned on, and the locking hook (302) is limited by the slot (202). When the knob switch is in the closed state, the DC power control unit (109) is disconnected from the DC power distribution unit circuit, and the locking hook (302) is disengaged from the slot (202).

7. The DC power distribution unit according to claim 6, characterized in that, The rotary switch is a self-locking rotary switch.

8. The DC power distribution unit according to claim 2, characterized in that, The electromechanical locking mechanism includes a mechanical knob and a rocker switch (305). The mechanical knob includes a rotatable second operating knob (303) that can switch between two positions. The second operating knob (303) is connected to a second rotating shaft, and the locking hook (302) is disposed on the second rotating shaft. The second operating knob (303) is located outside the housing of the DC power distribution unit (100), and the locking hook (302) is located inside the housing of the DC power distribution unit (100). A cam (304) is also provided on the second rotating shaft. The rocker switch (305) and the cam (304) are located inside the housing of the DC power distribution unit (100). The output end of the rocker switch (305) is connected to the control circuit of the DC power control unit (109). The cam (304) and the locking hook (302) rotate together with the second operating knob (303). When the second operating knob (303) is in the first position, the cam (304) moves the rocker operation button (306) of the rocker switch (305) to the open state, and the DC power control unit (109) is turned on. When the second operating knob (303) is in the second position, the cam (304) moves the rocker operation button (306) to the closed state, and the DC power control unit (109) is disconnected from the DC power distribution unit circuit.

9. The DC power distribution unit according to claim 8, characterized in that, The mechanical knob also includes a mechanical locking device, which enables the second operating knob (303) to self-lock in the first position and the second position.

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